JP2014157248A - Camera accessory - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera accessory that allows for prevention of degradation of an image to be acquired by imaging.SOLUTION: An accessory is detachably attachable to a camera body including a camera body side mount, and includes a cylinder section having an optical path on an inner periphery side, and in the accessory for a camera including an accessory side mount of a bayonet structure having first to third claws disposed to protrude toward an outside in a radial direction from the outer periphery surface spaced apart from each other along a circumferential direction of the outer periphery surface at the outer periphery surface of the cylindrical section, the cylinder section is characterized in that one part along the circumferential direction of the cylinder facing the camera body side mount is cut out.

Description

  The present invention relates to a camera accessory that can be attached to and detached from a camera body having a bayonet-structured body-side mount.

  2. Description of the Related Art There are known camera accessories and camera bodies configured to detachably couple camera accessories such as interchangeable lenses and camera bodies using a bayonet structure mounting system. In such camera accessories and camera bodies, the camera accessory mount is inserted into the camera body mount at a regular insertion / extraction phase, and then the camera accessory is rotated in a predetermined direction (mounting direction) around the incident optical axis. Then, the camera accessory and the camera body are coupled. In addition, after rotating the camera accessory connected to the camera body in the direction opposite to the mounting direction (removal direction), the camera accessory is removed from the camera body by pulling the camera accessory forward. (See Patent Document 1).

JP 2012-77873 A

  With the camera accessory described in the above-mentioned patent document, when the accessory is mounted, if the camera body side mount and the accessory side mount are in the normal insertion / extraction phase, the camera accessory is inserted in an oblique direction. In this case, a cylindrical wall formed between the claw and the claw of the mount on the accessory side collides with the claw of the mount on the camera body side. At this time, since the area of the collision portion is small, the force is concentrated. Therefore, when the mounting operation in such a state is repeated, wear powder due to scraping is generated from each mount due to rubbing of the collision portion. Therefore, there is a possibility that the wear powder enters the camera body or the accessory. Further, there is a possibility that deformation of the collision part occurs.

  An accessory for a camera according to the present invention is an accessory that can be attached to and detached from a camera body having a camera body side mount, and includes a cylindrical portion having an optical path on the inner peripheral side, and an outer peripheral surface on the outer peripheral surface of the cylindrical portion. An accessory for a camera comprising a bayonet-structured accessory-side mount having first to third claws that are spaced apart from each other along the circumferential direction and project outward from the outer circumferential surface in the radial direction. When the mount is inserted into the camera body side mount at a normal insertion / extraction phase, all of the first to third claws are obstructed by the three camera body side claws provided on the camera body side mount. The first to third claws are arranged on the accessory side mount so that insertion into the camera body side mount is permitted, and the first to third claws are The first claws extend in the circumferential direction, and the length extending in the circumferential direction is the longest among the first to third claws, and the third claws extend in the circumferential direction. The extending length is the shortest of the first to third claws, and the accessory side mount is inserted with a regulating member provided in the vicinity of the third claw and a lock pin provided on the camera body. A lock pin hole for restricting rotation of the camera accessory relative to the camera body, and the restricting member is provided at a position substantially opposite to the lock pin hole across the center of the cylindrical portion, The cylindrical portion is characterized in that a part along the circumferential direction is omitted.

  According to the present invention, it is possible to prevent deterioration in quality of an image obtained by imaging.

1 is a perspective view schematically showing an interchangeable lens camera body to which the present invention is applied and a photographic lens that is detachably attached to the camera body. It is the perspective view which showed typically the structure of the body side mount seen from the diagonal right front of the camera body. It is the perspective view which showed typically the structure of the accessory side mount seen from diagonally left back of a photographic lens. It is a figure explaining the arrangement | positioning position of a control member. It is a figure shown about the position of the body side nail | claw and body side groove | channel of a body side mount when a body side mount is seen from the front of a camera body. It is a figure shown about the position of the accessory side nail | claw and accessory side groove | channel of an accessory side mount when an accessory side mount is seen from the back of an imaging lens. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is the figure which showed typically the state which expand | deployed the body side 1st nail | claw seen from the radial direction outer side along the periphery. It is a figure which shows the change of the engagement state of the accessory side 2nd nail | claw and the body side 2nd nail | claw at the time of mounting | wearing and removal of a photographic lens. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure explaining the relationship between the body side mount and the accessory side mount when excessive external force is applied to the photographic lens in the same direction as gravity. It is a figure explaining the contact points PD and PU and distance LS when the attitude | position of a camera body is a horizontal position. It is a figure explaining the contact points PD and PU and distance LS when the attitude | position of a camera body is a vertical position. It is a figure explaining the contact points PD and PU and distance LS when the attitude | position of a camera body is a vertical position. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification. It is the perspective view which showed typically the camera lens of 2nd Embodiment, and the imaging lens with which a camera body is attached so that attachment or detachment is possible. It is the perspective view which showed typically the structure of the body side mount seen from the diagonal right front of the camera body. It is the perspective view which showed typically the structure of the accessory side mount seen from diagonally left back of a photographic lens. It is a figure explaining the arrangement | positioning position of a control member. It is a figure shown about the position of the body side nail | claw and body side groove | channel of a body side mount when a body side mount is seen from the front of a camera body. It is a figure shown about the position of the accessory side nail | claw and accessory side groove | channel of an accessory side mount when an accessory side mount is seen from the back of an imaging lens. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure which shows the presence or absence (overlapping state) of interference with a body side nail | claw and an accessory side nail | claw. It is a figure explaining rocking | fluctuation of the accessory side mount with respect to a body side mount when the clearance gap between the internal peripheral surface of a body side mount and the fitting part of an accessory side mount becomes large. It is a figure for demonstrating the range of the phase in which the control member in a mounting completion state is provided. It is a graph for demonstrating the range of the phase in which the control member in a mounting completion state is provided. It is a figure explaining the contact site | part at the time of insertion of a photographic lens. It is a figure explaining the contact site | part at the time of insertion of a photographic lens. It is a figure explaining the contact site | part at the time of insertion of a photographic lens. It is an external view of an accessory side mount. It is the perspective view which showed typically the structure of the accessory side mount provided with the 2nd cylindrical wall part. It is an external view of the accessory side mount provided with the 2nd cylindrical wall part. It is an external view of the accessory side mount which notched a part of outer peripheral surface of the 2nd cylindrical wall part. It is a figure of the accessory side mount which provided the notch part in the outer peripheral surface of the cylindrical part in front of the accessory side 3rd nail | claw. It is an external view of the accessory side mount in which the protrusion part was provided in the inner surface of opening. It is an external view of the accessory side mount whose opening shape is a polygon.

<First Embodiment>
A first embodiment of a camera accessory, an accessory side mount, a camera body, and a body side mount according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view schematically showing an interchangeable lens type camera body 1 to which the present invention is applied and a photographing lens 2 that is detachably attached to the camera body 1. The camera body 1 is provided with a release button 4, an image sensor 5, and a control circuit 6 that controls each part of the camera body 1. Reference numeral 3 denotes a photographing optical path for guiding a subject image from the photographing lens 2 to the image sensor 5.

  On the front surface of the camera body 1, a body side mount 100 having a bayonet structure for mounting a camera accessory such as a converter lens for changing a focal length, in addition to the photographing lens 2, is provided. An accessory side mount 200 for detachably mounting the photographic lens 2 on the body side mount 100 is provided at the rear of the photographic lens 2. In FIG. 1, detailed shapes of the body side mount 100 and the accessory side mount 200 are not shown. In the present embodiment, the front side (subject side) of the camera body 1 to which the photographing lens 2 is attached is defined as the front side, and the back side of the camera body 1 provided with the imaging element 5 is defined as the rear side. Further, the vertical and horizontal directions of the camera body 1 are defined as shown in FIG. In FIG. 1, the vertical direction of the camera body 1 coincides with the vertical direction. As shown in FIG. 1, the posture of the camera body 1 when the camera body 1 is erected is referred to as a normal posture or a lateral position. The posture of the camera body 1 when the camera body 1 in the horizontal position is rotated 90 degrees clockwise or counterclockwise when viewed from the front is referred to as a vertical position.

--- Body-side mount 100 ---
FIG. 2 is a perspective view schematically showing the structure of the body-side mount 100 as seen from the diagonally right front of the camera body 1. In the body-side mount 100, three claws (body-side claws) spaced apart along the periphery of the circular opening (shooting optical path) of the camera body 1 project from the outer circumference to the inner side. Presents a bayonet structure. Among the three body side claws, the uppermost body side claw is referred to as a body side first claw 110, and in order from the body side first claw 110 to the counterclockwise direction in the drawing, the body side second claw 120, the body This is called the side third claw 130.

  A space between two adjacent body side claws through which the claw of the accessory side mount 200 (accessory side claw) passes when the photographic lens 2 is attached and detached is referred to as a body side groove, as will be described later. The body-side groove between the body-side third claw 130 and the body-side first claw 110 is called a body-side first groove 151, and the body-side second in order from the body-side first groove 151 toward the counterclockwise direction in the drawing. They are referred to as a groove 152 and a body-side third groove 153.

  The front side of the body-side first claw 110 is referred to as a front surface 113, and the side end on the counterclockwise direction facing the body-side second groove 152 is referred to as the first side end 111, and the side facing the body-side first groove 151 is illustrated. The side end on the clockwise side is referred to as the second side end 112. Similarly, the front surface of the body-side second claw 120 is referred to as the front surface 123, the side end facing the body-side third groove 153 is referred to as the first side end 121, and the side end facing the body-side second groove 152 is the first end. Called the two-side end 122. The front surface of the body side third claw 130 is referred to as the front surface 133, the side end facing the body side first groove 151 is referred to as the first side end 131, and the side end facing the body side third groove 153 is the second side end. 132. The first side ends 111, 121, 131 face the mounting direction described later, and the second side ends 112, 122, 132 face the direction opposite to the mounting direction (removal direction) described later. ing.

  Although not shown in FIG. 2, the rear surface of the body-side first claw 110 is referred to as a rear surface and is denoted by reference numeral 114. Similarly, the rear surface of the body-side second claw 120 and the rear surface of the body-side third claw 130 are referred to as rear surfaces, and are denoted by reference numerals 124 and 134, respectively.

  Reference numeral 101 denotes a body-side mount reference surface. The body-side mount reference surface 101 is a donut-shaped flat surface formed toward the front, and comes into contact with an accessory-side mount reference surface 201 of an accessory-side mount 200 (described later) of the photographic lens 2 that has been attached. 2 is a reference surface that defines the position in the front-rear direction. Reference numeral 102 denotes a cylindrical inner peripheral surface of the body-side mount 100, which is fitted with a fitting portion 202 of an accessory-side mount 200, which will be described later, so that the optical axis of the taking lens 2 is the optical axis of the camera body 1 (shooting optical path). 3 is a surface serving as a reference for matching with the third central axis). Reference numeral 161 denotes a pin hole for a pin (not shown) to appear and to be fixed so that the photographic lens 2 that has been attached is fixed so as not to rotate with respect to the camera body 1 (body-side mount 100).

--- Accessory side mount 200 ---
FIG. 3 is a perspective view schematically showing the structure of the accessory-side mount 200 as viewed from the diagonally left rear of the photographic lens 2. Note that the accessory-side mount 200 shown in FIG. 3 shows a state in which the mounting of the photographing lens 2 to the camera body 1 is completed (mounting complete state), that is, a state in which photographing is possible. Therefore, the orientation of the accessory-side mount 200 shown in FIG. 3 in the vertical and horizontal directions coincides with the vertical and horizontal directions of the camera body 1. In the following description, unless otherwise specified, the orientation of the accessory-side mount 200 in the up / down / left / right directions is the orientation in the mounted state.

  The accessory-side mount 200 includes a cylindrical portion 270 having an optical path on the inner peripheral side, and an opening 280 on the inner peripheral side. The accessory-side mount 200 has three claws (accessory-side claws) that are spaced apart in the circumferential direction from the outer peripheral surface 270A of the cylindrical part 270 (hatched part in FIG. 3) at the rear part of the cylindrical part 270. The bayonet structure which protrudes toward the outer side from the inner side in the radial direction of the cylindrical part 270 is exhibited. Of the three accessory side claws, the uppermost accessory side claw is referred to as an accessory side first claw 210, and the accessory side second claw 220 and the accessory side in order from the accessory side first claw 210 toward the illustrated clockwise direction. This is called the third claw 230. The shape of the inner side of the accessory side mount 200 will be described in detail later.

  A space between two adjacent accessory-side claws through which the body-side claws pass when the taking lens 2 is inserted and removed is referred to as an accessory-side groove, as will be described later. The accessory-side groove between the accessory-side first claw 210 and the accessory-side second claw 220 is referred to as an accessory-side first groove 251, and the accessory-side second groove sequentially from the accessory-side first groove 251 toward the illustrated clockwise direction. 252 and called the accessory-side third groove 253.

  The rear surface of the accessory side first claw 210 is called a rear surface 213, the side end facing the accessory side first groove 251 is called a first side end 211, and the side end facing the accessory side third groove 253 is a second side end. Called 212. Similarly, the rear surface of the accessory-side second claw 220 is referred to as a rear surface 223, the side end facing the accessory-side second groove 252 is referred to as the first side end 221, and the side end facing the accessory-side first groove 251 is the first end. Called the two side end 222. The rear surface of the accessory side third claw 230 is called a rear surface 233, the side end facing the accessory side third groove 253 is called a first side end 231, and the side end facing the accessory side second groove 252 is a second side end. Call 232. The first side ends 211, 221, and 231 face the mounting direction described later, and the second side ends 212, 222, and 232 face the direction opposite to the mounting direction (removal direction) described later. ing.

  Although not shown in FIG. 3, the front surface of the accessory-side first claw 210 is referred to as a front surface, and is denoted by reference numeral 214. Similarly, the front surface of the accessory-side second claw 220 and the front surface of the accessory-side third claw 230 are referred to as the front surface, and are denoted by reference numerals 224 and 234, respectively.

  A portion of the cylindrical portion 270 between the accessory-side first claw 210 and the accessory-side second claw 220 and facing the accessory-side first groove 251 is referred to as a first cylindrical wall portion 271. A portion of the cylindrical portion 270 between the accessory-side first claw 210 and the accessory-side third claw 230 and facing the accessory-side third groove 253 is referred to as a third cylindrical wall portion 273. In the present embodiment, there is no portion of the cylindrical portion 270 between the accessory-side second claw 220 and the accessory-side second claw 220 and facing the accessory-side second groove 252. The part is referred to as a virtual second cylindrical wall portion 272. In the following description, the outer peripheral surface 270A (shaded portion in FIG. 3) of the cylindrical portion 270 may be simply referred to as a peripheral surface.

  Reference numeral 201 denotes an accessory-side mount reference surface. The accessory-side mount reference surface 201 is a donut-shaped flat surface formed toward the rear, and comes into contact with the body-side mount reference surface 101 when the mounting is completed. Reference numeral 202 denotes a fitting portion that is fitted to the inner peripheral surface 102 of the body-side mount 100 and serves as a reference for making the optical axis of the photographing lens 2 coincide with the optical axis of the camera body 1 (the central axis of the photographing optical path 3). This is a cylindrical part. Reference numeral 261 denotes a pin hole that protrudes and protrudes from the pin hole 161 of the body-side mount 100 in order to fix the mounted taking lens 2 so as not to rotate with respect to the camera body 1 (body-side mount 100). A pin (not shown) is inserted.

  As shown in FIGS. 3 and 4, in the front of the accessory side second claw 220 in the vicinity of the second side end 222, when the photographic lens 2 is attached or detached, the photographic lens 2 (with respect to the camera body 1 (body side mount 100)) A restricting member 262 for restricting the rotation range of the accessory side mount 200) is provided. The restriction of the rotation range by the restriction member 262 will be described in detail later. The restriction member 262 is, for example, a headed pin that is screwed from the outside in the radial direction of the accessory side mount 200.

--- Positions of body side claws and body side grooves ---
FIG. 5 is a diagram illustrating the positions of the body-side claws and the body-side grooves of the body-side mount 100 when the body-side mount 100 is viewed from the front of the camera body 1. The arrangement position of the body side claw is expressed as follows in the counterclockwise angle with respect to the 3 o'clock direction when the body side mount 100 is viewed from the front of the camera body 1. The body-side first claw 110 exists in the range of 76 degrees to 130 degrees. The body-side second claw 120 exists in the range of 177.5 degrees to 226 degrees. The body side third claw 130 exists in the range of 304.5 degrees to 15 degrees (375 degrees).

  When the size of each body side claw 110 to 130 is expressed by an angle range along the periphery of the circular opening of the body side mount 100, the body side first claw 110 is 54 degrees, and the body side second claw 120 is 48 degrees. It is 5 degrees, and the body side third claw 130 is 70.5 degrees. Similarly, when the size of each of the body side grooves 151 to 153 is represented by an angle range along the periphery of the circular opening of the camera body 1, the body side first groove 151 is 61 degrees, and the body side second groove 152 is It is 47.5 degrees, and the body side third groove 153 is 78.5 degrees.

  In FIG. 5, 7 is a mark indicating the position of the index provided on the camera body 1. This index serves as a mark when the photographic lens 2 is attached to the camera body 1, and its position is opposite to the 3 o'clock direction when the body side mount 100 is viewed from the front of the camera body 1. The angle in the clockwise direction is 90 degrees.

--- About the position of accessory side claw and accessory side groove ---
FIG. 6 is a diagram illustrating the positions of the accessory side claw and the accessory side groove of the accessory side mount 200 when the accessory side mount 200 is viewed from the rear side of the photographing lens 2. When the accessory-side mount 200 in the above-mentioned mounting completion state of the photographic lens 2 is viewed from the rear of the photographic lens 2, the accessory-side claw disposition position is expressed by a clockwise angle with respect to the 9 o'clock direction. It becomes like this. The accessory side 1st nail | claw 210 exists in the range of 56.5 degree | times to 115 degree | times. The accessory-side second claw 220 exists in the range of 172.5 degrees to 214.5 degrees. The accessory-side third claw 230 exists in the range of 267.5 degrees to 343.5 degrees.

  When the length extending in the circumferential direction of the accessory-side mount 200 of each accessory-side claw 210 to 230 is represented by an angular range along the circumferential direction of the accessory-side mount 200, the accessory-side first claw 210 has 58. 5 degrees, the accessory-side second claw 220 is 42 degrees, and the accessory-side third claw 230 is 76 degrees. Similarly, when the size of each accessory side groove 251 to 253 is expressed by an angle range along the circumferential direction of the accessory side mount 200, the accessory side first groove 251 is 57.5 degrees, and the accessory side second groove 252 is provided. Is 53 degrees, and the accessory-side third groove 253 is 73 degrees.

  In FIG. 6, 8 is a mark indicating the position of the index provided on the photographic lens 2. This index serves as a mark when the photographic lens 2 is mounted on the camera body 1, and when the accessory side mount 200 in the above-described mounting completion state of the photographic lens 2 is viewed from behind the photographic lens 2. The angle in the clockwise direction with respect to the 9 o'clock direction is 130.5 degrees. This angle corresponds to an angle obtained by adding 90 ° to a mounting angle 40.5 ° described later.

  As described above, the restricting member 262 is provided in front of the accessory-side second claw 220 in the vicinity of the second-side end 222. That is, the regulating member 262 has the shortest length extending in the circumferential direction of the accessory-side mount 200 (the narrowest angle range along the circumferential direction of the accessory-side mount 200) is near the accessory-side second claw 220. Is provided.

--- Mounting the photographic lens 2 to the camera body 1 ---
The photographic lens 2 configured as described above is attached to the camera body 1 as follows. The rotational position of the photographic lens 2 relative to the camera body 1 in the state where the axis extending in the front-rear direction and the optical axis of the photographic lens 2 coincide with the center of the photographic optical path 3 of the camera body 1 is simply referred to below. This is called the insertion / extraction phase. The axis extending in the front-rear direction of the center of the photographing optical path 3 of the camera body 1 and the optical axis of the photographing lens 2 are made to coincide with each other, and the rotation position of the index provided on the photographing lens 2 and the index provided on the camera body 1 , The accessory side mount reference surface 201 and the body side mount reference surface 101 come into contact with each other without the body side claws 110 to 130 interfering with the accessory side claws 210 to 230 as shown in FIG. The accessory side mount 200 can be inserted into the body side mount 100. The insertion / extraction phase at this time is called a normal insertion / extraction phase. FIG. 7 is a diagram showing the presence / absence (overlapping state) of interference between the body side claws 110 to 130 and the accessory side claws 210 to 230. The accessory side claws are schematically illustrated by fan-shaped figures. Yes.

  When the accessory-side mount 200 is inserted into the body-side mount 100 at the normal insertion / extraction phase, the accessory-side first claw 210 passes from the front to the rear of the body-side first groove 151, and the accessory-side second claw 220 is the body-side second. The accessory-side third claw 230 passes from the front to the rear of the body-side third groove 153. Similarly, when the accessory-side mount 200 is inserted into the body-side mount 100 at the normal insertion / extraction phase, the body-side first claw 110 passes from the back to the front of the accessory-side first groove 251 (not labeled in FIG. 7). The body-side second claw 120 passes from the back to the front of the accessory-side second groove 252 (not labeled in FIG. 7), and the body-side third claw 130 passes through the accessory-side third groove 253 (in FIG. 7). Passes from the back to the front (not marked).

  After the accessory-side mount 200 is inserted into the body-side mount 100 at the normal insertion / extraction phase, when the photographing lens 2 is rotated counterclockwise when viewed from the front of the camera body 1, the accessory-side first claw 210 is moved to the body-side first. The accessory side second claw 220 enters the rear side of the body side second claw 120 and the accessory side third claw 230 enters the rear side of the body side third claw 130. In this way, when the photographing lens 2 is rotated counterclockwise when viewed from the front of the camera body 1, as shown in FIG. 8, when the lens 2 is rotated 40.5 degrees from the normal insertion / extraction phase, the regulating member 262 is rotated. Comes into contact with the second side end 122 of the body-side second claw 120, and the counterclockwise rotation is restricted. As described above, when the photographing lens 2 is rotated 40.5 degrees counterclockwise from the normal insertion / extraction phase, the accessory side mount 200 is coupled to the body side mount 100 (coupling between the accessory side claw and the body side claw). Is completed), the mounting of the taking lens 2 is completed. The rotation angle (40.5 degrees) of the photographing lens 2 from the normal insertion / extraction phase to the phase where the mounting of the photographing lens 2 is completed is referred to as a mounting angle. The counterclockwise rotation direction described above is also referred to as a mounting direction.

  When the mounting of the photographic lens 2 is completed, the position of the pin hole 261 of the accessory side mount 200 overlaps the position of the pin hole 161 of the body side mount 100. Then, a pin (not shown) that appears and disappears from the pin hole 161 of the body side mount 100 is inserted into the pin hole 261.

--- When removing the mounted taking lens 2 from the camera body 1 ---
In the case of removing the mounted taking lens 2 from the camera body 1, the following is performed. First, the above-described pin is removed from the pin hole 261 by pressing a button (not shown) provided on the camera body 1. In this state, when the photographing lens 2 is rotated clockwise to the normal insertion / extraction phase when viewed from the front of the camera body 1, the connection between the accessory side claw and the body side claw is released. When the photographing lens 2 is rotated to the normal insertion / extraction phase, the restricting member 262 comes into contact with the first side end 111 of the body-side first claw 120 and the clockwise rotation is restricted. That is, the state returns to the state shown in FIG. At the regular insertion / removal position, as described above, the body side claws 110 to 130 and the accessory side claws 210 to 230 do not interfere with each other, so that the photographing lens 2 can be removed in front of the camera body 1. The clockwise rotation direction described above is also referred to as a removal direction.

--- About the connection state of the accessory side nail and the body side nail ---
FIG. 9 is a diagram schematically showing a state in which the body-side first claw 110 is deployed along the circumference as seen from the outside in the radial direction. In the vicinity of the second side end 112 of the body side first claw 110, the accessory side first claw 210 can smoothly wrap around the rear side of the body side first claw 110 when the taking lens 2 is mounted. In addition, a tapered surface 117 having a rear surface 114 side formed on a taper is provided. In the vicinity of the second side end 112 of the body-side first claw 110, a contact portion 115 that is a surface perpendicular to the front-rear direction of the body-side mount 100 is provided following the tapered surface 117. A spring 116 is provided on the rear surface 114 adjacent to the contact portion 115.

  The spring 116 comes into contact with the front surface 214 (not shown in FIG. 9) of the accessory-side first claw 210 that has entered the rear side of the body-side first claw 110 and presses it backward, so that the accessory-side mount reference surface This is an elastic member for keeping 201 and the body-side mount reference surface 101 in contact with each other. For example, when the photographing lens 2 is attached to the camera body 1 when an external force is applied to the photographing lens 2 that has been attached, and the photographing lens 2 tries to tilt against the urging force of the spring 116, This is a part that contacts the front surface 214 of the first claw 210 and restricts the movement of the accessory-side first claw 210 forward. When the accessory-side mount reference surface 201 and the body-side mount reference surface 101 are in contact (contact) with each other due to the biasing force of the spring 116, the contact portion 115 is the front surface 214 of the accessory-side first claw 210. And slightly separated.

  The body side second claw 120 and the body side third claw 130 have the same structure. That is, in the vicinity of the second side end 122 of the body side second claw 120, a tapered surface 127 having a rear surface 124 side formed on a taper is provided. In the vicinity of the second side end 122 of the body-side second claw 120, a contact portion 125 that is a surface perpendicular to the front-rear direction of the body-side mount 100 is provided following the tapered surface 127. A spring 126 is provided on the rear surface 124 adjacent to the contact portion 125. In the vicinity of the second side end 132 of the body side third claw 130, a tapered surface 137 having a rear surface 134 formed on a taper is provided. In the vicinity of the second side end 132 of the body-side third claw 130, a contact portion 135 that is a surface perpendicular to the front-rear direction of the body-side mount 100 is provided following the tapered surface 137. A spring 136 is provided on the rear surface 134 adjacent to the contact portion 135.

  In FIG. 8, the mark 116 a indicates in which phase along the circumferential direction the position where the spring 116 presses the front surface 214 of the accessory-side first claw 210. Similarly, the mark denoted by reference numeral 126a indicates in which phase along the circumferential direction the position where the spring 126 presses the front surface 224 of the accessory-side second claw 220 is, and the mark denoted by reference numeral 136a is The phase at which the position where the spring 136 presses the front surface 234 of the accessory side third claw 230 is in the circumferential direction is shown.

  For example, as shown in FIGS. 7 and 8, the contact portion 115 is provided substantially directly above the body-side mount 100. The contact portion 125 is provided at a position separated from the second side end 122 of the body side second claw 120 by the same distance as the distance between the second side end 112 of the body side first claw 110 and the contact portion 115. ing. The contact portion 135 is provided at a position separated from the second side end 132 of the body side third claw 130 by the same distance as the distance between the second side end 112 of the body side first claw 110 and the contact portion 115. ing.

  FIG. 10 is a diagram showing a change in the engagement state between the accessory-side second claw 220 and the body-side second claw 120 when the photographic lens 2 is attached to and detached from the camera body 1 in time series. It is the figure which showed typically the state which expand | deployed the body side 2nd nail | claw 120 seen from the outer side along the periphery. FIG. 10A is a diagram illustrating a state where the accessory-side second claw 220 of the accessory-side mount 200 inserted in the regular insertion / extraction phase passes through the body-side second groove 152. FIG. 10B shows the accessory-side second claw in a state where the accessory-side second claw 220 passes through the body-side second groove 152 and the accessory-side mount reference surface 201 and the body-side mount reference surface 101 are in contact with each other. It is a figure which shows the mode of 220 and the body side 2nd nail | claw 120. FIG.

  Thereafter, when the photographing lens 2 is rotated in the mounting direction, as shown in FIG. 10C, the accessory-side second claw 220 enters the rear side of the body-side second claw 120, and FIG. As shown, the accessory-side second claw 220 moves to the rear of the spring 126, and the accessory-side second claw 220 is urged rearward by the spring 126. When the photographic lens 2 is rotated in the mounting direction by the mounting angle from the normal insertion / extraction position, the restricting member 262 is placed on the second side end 122 of the body-side second claw 120 as shown in FIG. Since it abuts, the rotation of the taking lens 2 in the mounting direction is restricted.

  When the photographic lens 2 is rotated in the detaching direction from the state shown in FIG. 10E in order to remove the photographic lens 2 from the camera body 1, when the photographic lens 2 is rotated by the mounting angle, FIG. As shown in FIG. 3, the restricting member 262 contacts the first side end 111 of the body-side first claw 110, so that the rotation of the taking lens 2 in the removal direction is restricted.

--- About the contact area when the photographic lens 2 is inserted ---
For example, when an accessory such as a photographic lens 2 is to be attached to the camera body 1, as shown in FIG. 39, if the user is right-handed, the camera body 1 is held with the left hand and the photographic lens 2 held with the right hand is the camera. Often trying to attach to the body 1. At this time, it is rare that the accessory-side mount 200 is inserted into the body-side mount 100 while the optical axis on the camera body 1 side and the optical axis on the photographing lens 2 side are kept in agreement. In many cases, the accessory-side mount 200 is inserted into the body-side mount 100 with the optical axis on the camera body 1 side and the optical axis on the photographing lens 2 side in a twisted position.

  In this case, as shown in FIG. 40, the user in the body side mount 100 of the camera body 1 held by the left hand and the user in the accessory side mount 200 of the photographic lens 2 held by the right hand, as viewed from the user. It is easy to first contact the diagonally lower side when viewed from the front. That is, when the camera body 1 is held with the left hand and the photographing lens 2 held with the right hand is to be attached to the camera body 1, if the virtual second cylindrical wall portion 272 exists as shown in FIG. The body-side second claw 120 of the body-side mount 100 and the virtual second cylindrical wall portion 272 are easy to contact first.

  As described above, if the virtual second cylindrical wall portion 272 exists, the body-side second claw 120 of the body-side mount 100 and the virtual second cylindrical wall portion 272 come into contact with each other. There is a possibility that the part is rubbed to generate abrasion powder, or a small piece due to breakage of the contact part may occur. If wear powder or small pieces generated in this way enter the camera body 1 or the taking lens 2, the quality of the image obtained by imaging is deteriorated. Further, the body side second claw 120 may be deformed. Then, the deformation of the body side second claw 120 causes rattling between the camera body 1 and the photographic lens 2, resistance occurs during mounting, and the accessory side mount on which the body side second claw 120 slides. There is a possibility that the wear of 200 parts may progress rapidly.

  Therefore, in the present embodiment, as shown in FIGS. 3 and 42, a portion corresponding to the virtual second cylindrical wall portion 272 is removed from the accessory-side mount 200. In this way, by removing the portion corresponding to the virtual second cylindrical wall portion 272 from the accessory-side mount 200, the body-side second claw 120 is not contacted when the photographic lens 2 is mounted. Occurrence can be prevented.

  If the body side second claw 120 is not contacted or difficult to contact when the photographic lens 2 is mounted, all parts corresponding to the virtual second cylindrical wall portion 272 are removed from the accessory side mount 200. It does not have to be removed. For example, as shown in FIGS. 43 and 44, the rearward projecting distance from the rear end surface of the fitting portion 202 is shortened, and the rear end surface is the rear surface 223 of the accessory side second claw 220 or the accessory side third claw 230. A second cylindrical wall portion 272A formed so as to be positioned in front of the rear surface 233 may be provided. As described above, even when the second cylindrical wall portion 272A is provided, the same effect as that obtained when all the portions corresponding to the virtual second cylindrical wall portion 272 are removed from the accessory-side mount 200 is obtained.

  For example, as shown in FIG. 45, the second cylindrical wall portion 272B is provided similarly to the first cylindrical wall portion 271 and the third cylindrical wall portion 273, and a part of the outer peripheral surface of the second cylindrical wall portion 272B is provided. It is good also as a notch shape. This notched portion is referred to as a notched portion 274. Thus, also when the notch part 274 is provided, there exists an effect similar to the case where all the site | parts corresponding to the virtual 2nd cylindrical wall part 272 are removed from the accessory side mount 200. FIG.

  In addition, although it has been described that all or a part of the portion corresponding to the virtual second cylindrical wall part 272 is removed, the first cylindrical wall part 271 and the third cylindrical wall part 273 are all or a part thereof. It is good also as removing. That is, it is only necessary that a part of the cylindrical end surface facing the camera body side mount 100 is omitted from the cylindrical portion 270.

---- Preventing wear when rotating the camera lens 2 after insertion ---
As described above, after the accessory-side mount 200 is inserted into the body-side mount 100 at the normal insertion / extraction phase, when the photographing lens 2 is rotated counterclockwise as viewed from the front of the camera body 1, each accessory-side claw is Enter the back side of each body side nail. At this time, the cylindrical inner peripheral surface 102 of the body side mount 100 and the fitting portion 202 of the accessory side mount 200 are fitted, and the optical axis of the photographing lens 2 and the optical axis of the camera body 1 (the photographing optical path). 3). That is, movement of the photographing lens 2 in the vertical and horizontal directions with respect to the camera body 1 is restricted by a fitting portion between the cylindrical inner peripheral surface 102 of the body side mount 100 and the fitting portion 202 of the accessory side mount 200. . Therefore, in order to make the optical axis of the photographing lens 2 coincide with the optical axis of the camera body 1, the end surface of each body side claw facing the central axis of the photographing optical path 3 is the cylindrical portion of the accessory side mount 200 facing the end surface. It is not necessary to contact the outer peripheral surface of 270 (that is, the outer peripheral surface of the cylindrical portion 270 in front of each accessory side claw).

  Therefore, in the present embodiment, as shown in FIG. 46, a part of the outer peripheral surface of the cylindrical portion 270 of the accessory-side mount 200 where the end surfaces of the body-side claws facing the central axis of the imaging optical path 3 face each other is cut away. It has a shape. This notch is referred to as a notch 275. FIG. 46 shows an example in which a notch 275 is provided on the outer peripheral surface of the cylindrical portion 270 in front of the accessory-side third claw 230. Thus, by providing the notch part 275, the contact with the body side nail | facing which faces the said notch part 275 can be prevented reliably. Thereby, at the time of rotational mounting after the taking lens 2 is inserted, it is possible to prevent generation of wear powder due to contact between the outer peripheral surface of the cylindrical portion 270 and the body side claw, or generation of small pieces due to damage due to contact.

  In FIG. 46, the notch 275 is provided on the outer peripheral surface of the cylindrical portion 270 in front of the accessory-side third claw 230, but the outer peripheral surface of the cylindrical portion 270 in front of each accessory-side claw that exists in three places. Of these, the notch 275 may be provided in at least one place. That is, a part of the outer peripheral surface of the cylindrical portion 270 may be omitted. Thus, in the present embodiment, the cylindrical portion 270 is partially missing along the circumferential direction.

--- About the shape of the inner peripheral side of the accessory side mount 200 ---
The shape of the opening 280 of the accessory-side mount 200 shown in FIGS. 3 and 43 is circular. However, the shape of the opening 280 may be a shape other than a circle as long as the light flux of the subject is not affected. For example, as shown in FIG. 47, a protrusion 281 that protrudes inward in the radial direction from a virtual circle along the inner surface of the opening 280 may be provided. In addition, the protruding portion 281 may be provided with a plurality of protruding portions 281 at, for example, a protruding portion 281A as shown by a two-dot chain line in FIG.

  In addition, the disposition position of the protrusion 281 along the inner peripheral surface of the opening 280 is arbitrary. Further, when the plurality of projecting portions 281 are provided, they may be provided symmetrically with respect to the center of the opening 280 or may be provided asymmetrically. By providing the protrusion 281 in this manner, the strength (rigidity) of the accessory-side mount 200 can be improved and deformation of the accessory-side mount 200 can be suppressed. For example, the optical axis of the lens member attached to the accessory-side mount 200 can be reduced. The shift can be suppressed, and as a result, the image quality of the image obtained by imaging is improved.

  Further, as shown in FIG. 48, the shape of the opening 280 may be a polygon. FIG. 48 shows a case where the shape of the opening 280 is a regular octagon as an example of a polygon. In this way, when the shape of the opening 280 is not circular, the opening 280 may be configured so that the subject luminous flux passes inside the polygonal virtual inscribed circle 282. In this case, as compared with the case where a circular opening having the virtual inscribed circle 282 as the inner peripheral surface is provided, the hatched portion 283 surrounded by the inner peripheral surface of the opening 280 and the virtual inscribed circle 282 is provided. The accessory side mount 200 can be reduced in weight. The shape of the opening 280 is not limited to a regular polygon, but may be a general polygon. The number of corners is not limited to 8, and may be an arbitrary integer of 3 or more.

--- In case of trying to insert the photographic lens 2 in a phase other than the normal insertion / extraction phase ---
In the body side mount 100 and the accessory side mount 200 of the present embodiment, when the photographing lens 2 is to be inserted with a phase other than the normal insertion / extraction phase, at least two claws of the body side claws 110 to 130 and the accessory side claw The at least two claws 210 to 230 abut at a total of two or more locations, thereby prohibiting (blocking) insertion of the accessory side mount 200 into the body side mount 100.

  As can be clearly seen from FIG. 7, the rear surface of the accessory-side first claw 210 can be attached even if an attempt is made to mount the photographic lens 2 in a state where the photographic lens 2 is slightly rotated counterclockwise from the normal insertion / extraction phase. 213 is in contact with the front surface 113 of the body side first claw 110, the rear surface 223 of the accessory side second claw 220 is in contact with the front surface 123 of the body side second claw 120, and the rear surface 233 of the accessory side third claw 230 is on the body side. It contacts the front surface 133 of the third claw 130. In this case, when the three claws of the body side claws 110 to 130 and the three claws of the accessory side claws 210 to 230 abut, insertion of the accessory side mount 200 into the body side mount 100 is prohibited. For example, in FIG. 8, it is assumed that the accessory side claws 210 to 230 are located in front of the body side claws 110 to 130.

  From the state described above, when the photographing lens 2 is to be mounted while the photographing lens 2 is further rotated counterclockwise in the drawing, as shown in FIG. 11, the accessory-side second claw 220 has the body-side third groove. The accessory side second claw 220 does not come into contact with the body side claws 110 to 130 because the front side of the accessory side second claw 220 moves. However, the rear surface 213 of the accessory-side first claw 210 contacts the front surface 113 of the body-side first claw 110, and the rear surface 233 of the accessory-side third claw 230 contacts the front surface 133 of the body-side third claw 130. In this case, when the two claws of the body side claws 110 to 130 and the two claws of the accessory side claws 210 to 230 abut, insertion of the accessory side mount 200 into the body side mount 100 is prohibited. Become. In FIG. 11, the number of contact points between the body-side claws 110 to 130 and the accessory-side claws that are hatched is two in total.

  In the state shown in FIG. 11, when the taking lens 2 slightly turns counterclockwise, the rear surface 213 of the accessory-side first claw 210 comes into contact with the front surface 123 of the body-side second claw 120. That is, when the taking lens 2 is slightly rotated counterclockwise in the figure, the contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 become three. On the other hand, when the photographing lens 2 is rotated clockwise from the state shown in FIG. 11, the area of the portion where the rear surface 213 of the accessory-side first claw 210 and the front surface 113 of the body-side first claw 110 abut. And the area of the part which the rear surface 233 of the accessory side 3rd nail | claw 230 and the front surface 133 of the body side 3rd nail | claw 130 contact | abut will increase.

  Therefore, in the state shown in FIG. 11, the rear surface 213 of the accessory-side first claw 210 is in contact with the front surface 113 of the body-side first claw 110, and the rear surface 233 of the accessory-side third claw 230 is the front surface of the body-side third claw 130. In this case, the area of the abutting portion is the smallest when the abutting portion 133 is in contact with only the two abutting portions. When the body-side mount 100 is viewed from the front of the camera body 1, the contact portion between the rear surface 213 of the accessory-side first claw 210 and the front surface 113 of the body-side first claw 110 in the insertion / extraction phase shown in FIG. The angle range is 11 degrees.

  As will be described later, the two claws of the body-side claws 110 to 130 and the two claws of the accessory-side claws 210 to 230 abut at a total of two locations, so that the accessory-side mount 200 has the body-side mount 100. There are other situations where the insertion of is prohibited. However, since the two claws of the body side claws 110 to 130 and the two claws of the accessory side claws 210 to 230 abut at two places in total, insertion of the accessory side mount 200 into the body side mount 100 is prohibited. Among the two contact locations, the contact location with the smaller contact area has the smallest contact area in the state shown in FIG. 11 and in FIG. In this state, the photographing lens 2 is rotated counterclockwise by 11 degrees (not shown).

  In the state where the photographic lens 2 is rotated 11 degrees counterclockwise from the state shown in FIG. 11, instead of the rear surface 213 of the accessory side first claw 210 and the front surface 113 of the body side first claw 110 not contacting each other, The rear surface 213 of the accessory side first claw 210 contacts the front surface 123 of the body side second claw 120. Note that the other contact portion is a portion where the rear surface 233 of the accessory-side third claw 230 contacts the front surface 133 of the body-side third claw 130. When the contact portion between the rear surface 213 of the accessory-side first claw 210 and the front surface 123 of the body-side second claw 120 is represented by an angle range when the body-side mount 100 is viewed from the front of the camera body 1, FIG. It is 11 degrees as in the state shown.

  That is, also in this case, there are two contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 in total. In this state, the rear surface 213 of the accessory-side first claw 210 and the front surface 123 of the body-side second claw 120 are in contact with each other, and the rear surface 233 of the accessory-side third claw 230 and the front surface 133 of the body-side third claw 130 are in contact with each other. In the case where there are two contact portions in contact, the area of the contact portion is the smallest.

  That is, the area of the contact portion between the rear surface 213 of the accessory-side first claw 210 and the front surface 113 of the body-side first claw 110 shown in FIG. Since the two claws 210 to 230 are in contact with each other at a total of two locations, the area is the smallest in a state where the insertion of the accessory side mount 200 into the body side mount 100 is prohibited. Similarly, the contact portion between the rear surface 213 of the accessory-side first claw 210 and the front surface 123 of the body-side second claw 120 when the photographic lens 2 is rotated 11 degrees counterclockwise in the drawing from the state shown in FIG. Since the two claws of the body side claws 110 to 130 and the two claws of the accessory side claws 210 to 230 are in contact with each other at a total of two locations, the accessory side mount 200 is prohibited from being inserted into the body side mount 100. In the state where it is done, the area is the smallest. The insertion / removal phase shown in FIG. 11 and the insertion / removal phase when the photographic lens 2 is rotated 11 degrees counterclockwise from the state shown in FIG. 11 are referred to as a specific insertion / removal phase.

  As described above, when the photographic lens 2 is rotated counterclockwise from the state shown in FIG. 11, the rear surface 213 of the accessory side first claw 210 is moved to the front surface 113 of the body side first claw 110 and the body side second claw 120. The rear surface 233 of the accessory-side third claw 230 contacts the front surface 133 of the body-side third claw 130. That is, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is three.

  Further, when the photographic lens 2 is rotated counterclockwise in the figure, as described above, the rear surface 213 of the accessory-side first claw 210 is obtained when the photographic lens 2 is rotated 11 degrees counterclockwise in the figure from the state shown in FIG. And the front side 113 of the body-side first claw 110 do not come into contact with each other, so the total number of contact points between the body-side claw 110-130 and the accessory-side claw 210-230 is two.

  Further, when the photographing lens 2 is rotated counterclockwise in the figure, the state shown in FIG. 12 is obtained.

  As can be clearly seen from FIG. 12, when the taking lens 2 is slightly rotated counterclockwise from the state shown in FIG. 12, the rear surface 223 of the accessory-side second claw 220 becomes the front surface 133 of the body-side third claw 130. Comes to abut. That is, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is three. When the photographing lens 2 further rotates counterclockwise in the figure from this state, the rear surface 233 of the accessory-side third claw 230 comes into contact with the front surface 113 of the body-side first claw 110. That is, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is four.

  When the photographic lens 2 further rotates counterclockwise in the drawing, the rear surface 233 of the accessory side third claw 230 does not come into contact with the front surface 133 of the body side third claw 130, and then the rear surface 213 of the accessory side first claw 210 It does not contact the front surface 123 of the body side second claw 120. That is, as shown in FIG. 13, there are two contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 in total.

  When the photographic lens 2 is further rotated counterclockwise from the state shown in FIG. 13, the area of the portion where the rear surface 223 of the accessory-side second claw 220 and the front surface 133 of the body-side third claw 130 abut, The area of the portion where the rear surface 233 of the accessory-side third claw 230 and the front surface 113 of the body-side first claw 110 abut is reduced. Therefore, in the state shown in FIG. 13, the rear surface 223 of the accessory-side second claw 220 and the front surface 133 of the body-side third claw 130 come into contact with each other, and the rear surface 233 of the accessory-side third claw 230 and the body-side first claw 110 In the case where the front surface 113 comes into contact and there are two contact portions, the case where the area of the contact portion is the largest is shown.

  FIG. 14 is a state in which the photographic lens 2 is further rotated counterclockwise from the state shown in FIG. 13, and the rear surface 223 of the accessory-side second claw 220 and the front surface 133 of the body-side third claw 130 come into contact with each other. In the case where the rear surface 233 of the accessory-side third claw 230 and the front surface 113 of the body-side first claw 110 are in contact with each other so that there are two contact portions, the area of the contact portion is minimized. .

  When the taking lens 2 is slightly rotated counterclockwise from the state shown in FIG. 14, the rear surface 213 of the accessory-side first claw 210 comes into contact with the front surface 133 of the body-side third claw 130. At this time, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is three. From this state, when the photographing lens 2 is further rotated counterclockwise in the drawing, the rear surface 233 of the accessory-side third claw 230 comes into contact with the front surface 123 of the body-side second claw 120. At this time, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is four. If the photographing lens 2 is further rotated counterclockwise in the figure from this state, the rear surface 223 of the accessory-side second claw 220 and the front surface 133 of the body-side third claw 130 do not contact each other as shown in FIG. At this time, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is three.

  When the photographic lens 2 is slightly rotated counterclockwise from the state shown in FIG. 15, the rear surface 223 of the accessory-side second claw 220 comes into contact with the front surface 113 of the body-side first claw 110. The rear surface 233 of the accessory side third claw 230 does not come into contact with the front surface 113 of the body side first claw 110. When the photographing lens 2 is further rotated counterclockwise in the figure, the normal insertion / extraction phase shown in FIG. 7 is restored, and the body side claws 110 to 130 and the accessory side claws 210 to 230 do not contact (interfere).

--- About the accessory side third claw 230 ---
In the case where there are a total of two contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230, and one of them is located on the accessory side third claws 230, FIGS. As shown in FIG. 4, the contact portion of the accessory-side third claw 230 with the body-side claw 110 to 130 is not necessarily the first side end 231 side (that is, the rear surface 233 in the vicinity of the first side end 231). It exists on the second side end 232 side (that is, the rear surface 233 near the second side end 232). That is, when the total number of contact points between the body-side claws 110 to 130 and the accessory-side claws 210 to 230 is two, and one of them is present on the accessory-side third claw 230, an erroneous insertion is made. A blocking function is provided in the vicinity of the second side end 232 in the accessory-side third claw 230. The vicinity of the second side end 232 of the accessory side third claw 230 does not overlap the body side third claw 130 when the photographic lens 2 is attached to the camera body 1 as shown in FIG. It is configured to be located in the side third groove 153. That is, the vicinity of the second side end 232 of the accessory-side third claw 230 directly contributes to fixing the photographic lens 2 to the camera body 1 when the photographic lens 2 is attached to the camera body 1. Absent.

  Further, as described above, when the front surface 234 is pressed by the spring 136 of the body side third claw 130 in the vicinity of the first side end 231 among the accessory side third claws 230, an excessive external force is applied. The front surface 234 contacts the contact portion 135. That is, when the photographic lens 2 is attached to the camera body 1, a force for fixing the photographic lens 2 to the camera body 1 acts mainly in the vicinity of the first side end 231 in the accessory side third claw 230.

  In this manner, the function is shared by the vicinity of the first side end 231 and the vicinity of the second side end 232 along the extending direction of the accessory side third claw 230.

--- About the body side first nail 110 ---
In the case where there are a total of two contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230, and one of them is present on the body side first claws 110, FIGS. 14, the contact portion of the body side first claw 110 with the accessory side claws 210 to 230 is not necessarily the second side end 112 side (that is, the front surface 113 in the vicinity of the second side end 112). The first side end 111 is present (that is, the front surface 113 in the vicinity of the first side end 111). In other words, when the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is two, and one of them is present on the body side first claws 110, erroneous insertion A blocking function is provided in the vicinity of the first side end 111 of the body-side first claw 110.

  A spring 116 is provided adjacent to the contact portion 115 in the vicinity of the second side end 112 of the body side first claw 110. That is, the vicinity of the second side end 112 of the body-side first claw 110 has a function of fixing the photographing lens 2 to the camera body 1 when the photographing lens 2 is attached to the camera body 1.

  Thus, the function is shared by the vicinity of the 1st side end 111 and the vicinity of the 2nd side end 112 along the extension direction of the body side 1st nail | claw 110. As shown in FIG.

The camera body 1 and the taking lens 2 configured as described above have the following operational effects.
(1) It is configured to remove from the accessory-side mount 200 a portion that easily contacts the body-side mount 100 when the photographing lens 2 is attached. Thereby, generation | occurrence | production of the abrasion powder resulting from a contact and generation | occurrence | production of the small piece by damage can be prevented. Therefore, it is possible to prevent the generated wear powder and small pieces from entering the camera body 1 and the photographing lens 2 and to prevent deterioration in the quality of the image obtained by imaging.

(2) For example, as shown in FIG. 3 and FIG. 42, the portion corresponding to the virtual second cylindrical wall portion 272 is configured to be removed from the accessory-side mount 200. This prevents the body side second claw 120 from coming into contact with the body side mount 100 when the photographic lens 2 is mounted. Therefore, even if the accessory side mount 200 is slightly inclined with respect to the body side mount 100, insertion is possible. It becomes easy.

(3) For example, as shown in FIG. 43 and FIG. 44, the second end formed so that the rear end surface is located in front of the rear surface 223 of the accessory-side second claw 220 and the rear surface 233 of the accessory-side third claw 230. A cylindrical wall portion 272A is provided. This prevents the body side second claw 120 from coming into contact with the body side mount 100 when the photographic lens 2 is mounted. Therefore, even if the accessory side mount 200 is slightly inclined with respect to the body side mount 100, insertion is possible. It becomes easy. Furthermore, by providing the second cylindrical wall portion 272A, it is possible to suppress a decrease in the rigidity of the accessory-side mount 200 and improve the durability of the accessory-side mount 200.

(4) For example, as shown in FIG. 45, the second cylindrical wall portion 272B is provided in the same manner as the first cylindrical wall portion 271 and the third cylindrical wall portion 273, and a part of the outer peripheral surface of the second cylindrical wall portion 272B is provided. It was comprised so that it might be set as the shape which notched. As a result, when the body-side mount 100 and the second cylindrical wall portion 272B come into contact with each other, the two cylindrical wall portions 272B are likely to come into contact with each other, so that the force is easily dispersed and wear powder is generated. Can be suppressed. Furthermore, by providing the second cylindrical wall portion 272B, it is possible to suppress a decrease in the rigidity of the accessory-side mount 200 and improve the durability of the accessory-side mount 200. Moreover, since the notch part 274 is provided by simple cutting, processing cost can be suppressed.

(5) For example, as shown in FIG. 46, the cutout portion 275 is provided on the outer peripheral surface of the cylindrical portion 270 of the accessory side mount 200 where the end surfaces of the body side claws face each other. Thereby, at the time of rotational mounting after the taking lens 2 is inserted, it is possible to prevent generation of wear powder due to contact between the outer peripheral surface of the cylindrical portion 270 and the body side claw, or generation of small pieces due to damage due to contact. Therefore, it is possible to prevent the generated wear powder and small pieces from entering the camera body 1 and the photographing lens 2 and to prevent deterioration in the quality of the image obtained by imaging.

(6) For example, as shown in FIG. 47, a projecting portion 281 that projects inward in the radial direction from a virtual circle along the inner surface of the opening 280 is provided. As a result, the strength (rigidity) of the accessory-side mount 200 can be improved and the deformation of the accessory-side mount 200 can be suppressed. For example, the optical axis shift of the lens member attached to the accessory-side mount 200 can be suppressed. As a result, the image quality of the image obtained by imaging is improved.

(7) For example, as shown in FIG. 48, the shape of the opening 280 is configured to be a polygon. As a result, as compared with the case where a circular opening having the virtual inscribed circle 282 as an inner peripheral surface is provided, the hatched portion 283 surrounded by the inner peripheral surface of the opening 280 and the virtual inscribed circle 282 is equivalent to the accessory side. The mount 200 can be reduced in weight. Therefore, since the camera accessories such as the photographing lens 2 can be reduced in weight, it is possible to reduce the burden on the user's hand when photographing with the camera body 1 and the photographing lens 2 by hand, thereby suppressing camera shake.

(8) The three claws of the accessory side claws 210 to 230 are arranged at equal intervals, and the three claws of the body side claws 110 to 130 are arranged at equal intervals. Then, the photographing lens 2 can be attached to the camera body 1 even in a phase other than the normal insertion / extraction phase. Therefore, the size of the three claws of the accessory side claws 210 to 230 is changed, the arrangement interval is changed, the size of the three claws of the body side claws 110 to 130 is changed, and the arrangement interval is changed. Yes. In addition, when the photographing lens 2 is to be inserted with a phase other than the normal insertion / extraction phase, at least two claws of the body side claws 110 to 130 and at least two claws of the accessory side claws 210 to 230 total two or more places. By making contact, the insertion of the accessory side mount 200 into the body side mount 100 is prohibited. For example, if there is only one contact point between the camera accessory mount claws and the camera body mount claws, the other two claws that do not contact the accessory side are between the camera body side claws. There is a risk of getting in. However, in this embodiment, as described above, since the contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 are two or more in total except for the normal insertion / extraction phase, the camera accessory is used. It is possible to prevent erroneous mounting.

(9) The restricting member 262 contacts the second side end 122 of the body-side second claw 120 and the first side end 111 of the body-side first claw 110 to rotate the photographic lens 2 in the mounting direction and the detaching direction. It was configured to regulate the movement range. Thereby, since the rotation range to the rotation direction and removal direction of the photographic lens 2 can be controlled by one member of simple shape, the manufacturing cost of the body side mount 100 and the accessory side mount 200 can be suppressed.

(10) The restriction member 262 is provided in the vicinity of the side end of the accessory-side second claw 220 having the shortest length extending in the circumferential direction of the accessory-side mount 200. The accessory-side second claw 220 passes through the body-side second groove 152 in the normal insertion / extraction phase, but the angle range along the periphery of the circular opening of the camera body 1 of the body-side second groove 152 is 47.degree. 5 degrees. The mounting angle is 40.5 degrees. Within the angle range (47.5 degrees) in which the body-side second groove 152 extends, the regulating member 262 has the second-side end 122 of the body-side second claw 120 and the first-side end 111 of the body-side first claw 110. It can be said that the range that can be moved between the two corresponds to the mounting angle. Therefore, by providing the regulating member 262 in the vicinity of the side end of the accessory-side second claw 220 having the shortest length extending in the circumferential direction of the accessory-side mount 200, the mount including the body-side mount 100 and the accessory-side mount 200 is mounted. The mounting angle of the system will be defined. In addition, since the mounting angle is defined as follows, it can be said that the sizes of the body-side second groove 152 and the accessory-side second claw 220 are determined according to the mounting angle. By configuring in this way, a rational structure can be realized, and a useless part can be eliminated, contributing to weight reduction.

  The smaller the mounting angle is, the easier the mounting is, the amount of friction between the electrical contacts (not shown) on the camera body 1 side and the photographing lens 2 side can be reduced, and the wear of the electrical contacts caused by the replacement of the photographing lens 2 is reduced. be able to. However, if the mounting angle is too small, the engagement between the claws may be inadvertently disengaged, and the photographing lens 2 may easily fall off. On the other hand, in order to provide the springs 116, 126, 136, the contact portions 115, 125, 135, and the tapered surfaces 117, 127, 137, the body-side mount 100 needs to have a certain length in the circumferential direction. Further, in order to allow the accessory side claws 210 to 230 to be sufficiently applied to the springs 116, 126, 136 and the contact portions 115, 125, 135 beyond the tapered surfaces 117, 127, 137, a certain amount of mounting is required. Takes an angle. In the present embodiment, the mounting angle is 40.5 degrees based on these.

(11) Although the front side (subject side) of the photographic lens 2 is likely to hang down due to the influence of the weight of the photographic lens 2, the accessory side mount reference surface is urged by the urging force of the springs 116, 126, and 136 in a normal use state. The state where 201 is in contact with the body-side mount reference surface 101 is maintained. However, for example, when the camera body 1 is fixed to a tripod and an external force is applied to the photographic lens 2 in the same direction as gravity, and the state is greater than the biasing force of the spring, for example, when the camera body 1 is in a normal posture, The spring 116 of the uppermost body-side first claw 110 is further bent and the front surface 214 of the accessory-side first claw 210 comes into contact with the contact portion 115 of the body-side first claw 110.

  This state is shown in FIG. In FIG. 16, for convenience of explanation, the gaps between the parts are exaggerated. In this state, the lower side contacts the accessory-side mount reference surface 201 and the body-side mount reference surface 101 at the point PD, and the upper side of the front surface 214 of the accessory-side first claw 210 and the body-side first claw 110 as described above. The contact portion 115 comes into contact with the point PU, and the weight and external force of the photographing lens 2 are supported at these two points. Therefore, the force applied to the two points PD and PU can be reduced by increasing the distance LS between the two points PD and PU in the vertical direction (the direction in which gravity acts) as much as possible.

  Such a state does not occur in a normal photographing state unless an unintended external force is applied. However, it is necessary to consider this situation because the taking lens 2 has a generally cylindrical shape and is easy to touch, and it can be considered that it occurs at a certain frequency assuming various usage situations.

  The contact points PD and PU and the distance LS in each posture of the camera body 1 are shown in FIGS. In FIG. 17, the posture of the camera body 1 is a normal posture (lateral position), the distance LS at this time is LS1, and the contact points PD and PU are PD1 and PU1, respectively. In FIG. 18, the posture of the camera body 1 is a vertical position with the left side of the camera body 1 facing upward, the distance LS at this time is LS2, and the contact points PD and PU are PD2 and PU2, respectively. In FIG. 19, the posture of the camera body 1 is a vertical position with the right side of the camera body 1 facing upward, the distance LS at this time is LS3, and the contact points PD and PU are PD3 and PU3, respectively. A distance LS1 in the horizontal position shown in FIG. 17 and LS2 in the vertical position shown in FIG. 18 are both substantially equal to the diameter of the body-side mount 100. However, the distance LS3 in the vertical position shown in FIG. 19 is shorter than the distances LS1 and LS2.

  Therefore, the force applied to PU3 is larger than PU1 and PU2 if the external force acting on photographic lens 2 is the same.

  Therefore, in the present embodiment, the length of the body side third claw 130 in the circumferential direction is longer than that of the body side first claw 110 and the body side second claw 120. Thereby, the strength of the body side third claw 130 is higher than that of the body side first claw 110 and the body side second claw 120. Further, the length in the circumferential direction of the accessory-side third claw 230 of the accessory-side mount 200 that comes into contact with the contact portion 135 (that is, PU3) in the state where the mounting of the photographing lens 2 is completed is set to the accessory-side first length. It is longer than the one claw 210 and the accessory side second claw 220. Accordingly, the body-side third claw 130 and the accessory-side third claw 230 have sufficient strength. Therefore, even when the posture of the camera body 1 is in the vertical position shown in FIG. There is no problem with the side third claw 130 and the accessory side third claw 230.

  As described above, according to the present embodiment, the effect of reliably prohibiting erroneous insertion at a phase other than the normal insertion / extraction phase, and the accessory side in the state where the photographing lens 2 is mounted after being inserted at the normal insertion / extraction phase are provided. The mount 200 can be combined with the effect of ensuring the strength of the body-side mount 100.

(12) As described above, the function is shared by the vicinity of the first side end 231 and the vicinity of the second side end 232 along the extending direction of the accessory side third claw 230. . Thereby, durability of the accessory side 3rd nail | claw 230 improves. In particular, the accessory-side third claw 230 is a claw on which the above-described PU 3 acts in a vertical position with the right side of the camera body 1 facing upward, and is the claw with the greatest burden. By improving the durability of the accessory-side third claw 230, which is the most burdensome, the durability and reliability of the accessory-side mount 200 itself are improved.

(13) As described above, the function is shared between the vicinity of the first side end 111 and the vicinity of the second side end 112 along the extending direction of the body-side first claw 110. . Thereby, durability of the body side 1st nail | claw 110 improves. In particular, the body-side first claw 110 has a constant load on the spring 116 that is more constantly loaded than the other springs 126 and 136 due to the weight of the photographic lens 2 at the frequently used lateral position of the camera body 1. This is the claw on which the PU1 acts, and the claw that is most frequently burdened. By improving the durability of the body side first claw 110 that is most frequently burdened, the durability and reliability of the body side mount 100 itself is improved.

(14) In the present embodiment, since the contact portion 115 is configured to be provided substantially directly above the body-side mount 100, the above-described LS1 can be lengthened, so that the force applied to the contact point PU1 is reduced. Therefore, the durability of the body-side first claw 110 is improved. The drooping in front of the photographic lens 2 can be effectively suppressed. In addition, since the body-side first claw 110 is provided so as to be directly above the body-side mount 100, the strength of the contact portion 115 can be sufficiently secured, and the durability of the body-side first claw 110 is improved. . Therefore, durability and reliability of the body side mount 100 itself are improved.

(15) As shown in FIG. 16, the lower portions of the rear surfaces of the body side claws 110 to 130 and the front surfaces of the accessory side claws 210 to 230 are most difficult to hit. Therefore, it is less necessary to make the body side claws 110 to 130 and the accessory side claws 210 to 230 abut at this portion. Therefore, in the present embodiment, for example, as shown in FIG. 5, the largest body-side third groove 153 is located below the body-side mount 100. Therefore, the body side claws 110 to 130 can be rationally arranged.

(16) The accessory side claws 210 to 230 are arranged at the arrangement positions as shown in FIG. 6 for the following reason. The accessory-side first claw 210 that is positioned directly above when the photographing lens 2 is mounted on the camera body 1 in the horizontal position is desirably high in strength and has a long circumferential extension length. Better. However, as described above, since the largest body-side third groove 153 is configured to be positioned below the body-side mount 100, the body-side third groove is inserted when inserted at the regular insertion / extraction phase. The length extending in the circumferential direction of the accessory-side third claw 230 passing through 153 is the longest. Therefore, the accessory-side first claw 210 is configured such that the second length extending in the circumferential direction is long. And the accessory side 2nd nail | claw 220 with few restrictions as mentioned above is comprised so that the length extended in the circumferential direction may become the shortest. Thus, the accessory side nail | claw 210-230 can be rationally arrange | positioned by providing the accessory side nail | claw 210-230.

<Second Embodiment>
A second embodiment of the camera accessory, accessory side mount, camera body, and body side mount according to the present invention will be described with reference to FIGS. FIG. 23 is a perspective view schematically showing the interchangeable lens type camera body 1 according to the second embodiment and the photographing lens 2 that is detachably attached to the camera body 1. The camera body 1 is provided with a release button 4, an image sensor 5, and a control circuit 6 that controls each part of the camera body 1. Reference numeral 3 denotes a photographing optical path for guiding a subject image from the photographing lens 2 to the image sensor 5. Reference numeral 9 denotes a lens attachment / detachment lock pin for fixing the photographic lens 2 that has been attached so as not to rotate (rotate) with respect to the camera body 1.

--- Body-side mount 100 ---
FIG. 24A is a perspective view schematically showing the structure of the body side mount 100 as viewed obliquely from the right front side of the camera body 1, and FIG. FIG. In the body-side mount 100, three claws (body-side claws) spaced apart along the periphery of the circular opening (shooting optical path) of the camera body 1 project from the outer circumference to the inner side. Presents a bayonet structure. Among the three body side claws, the uppermost body side claw is referred to as a body side first claw 110, and in order from the body side first claw 110 to the counterclockwise direction in the drawing, the body side second claw 120, the body This is called the side third claw 130.

  Reference numeral 101 denotes a body-side mount reference surface. The body-side mount reference surface 101 is a donut-shaped flat surface formed toward the front, and comes into contact with an accessory-side mount reference surface 201 of an accessory-side mount 200 (described later) of the photographic lens 2 that has been attached. 2 is a reference surface that defines the position in the front-rear direction. Reference numeral 102 denotes a cylindrical inner peripheral surface of the body-side mount 100, which is fitted with a fitting portion 202 of an accessory-side mount 200, which will be described later, so that the optical axis of the taking lens 2 is the optical axis of the camera body 1 (shooting optical path). 3 is a surface serving as a reference for matching with the third central axis). Reference numeral 161 denotes a pin hole for the lens attaching / detaching lock pin 9 to appear and appear. As shown in FIG. 24B, the lens attaching / detaching lock pin 9 protrudes from the body-side mount reference surface 101 by a biasing force of a spring (not shown). When the user presses a lens attaching / detaching button (not shown), the lens attaching / detaching lock pin 9 is retracted rearward from the body-side mount reference surface 101 against a biasing force of a spring (not shown).

--- Accessory side mount 200 ---
FIG. 25 is a perspective view schematically showing the structure of the accessory-side mount 200 as viewed from the left rear side of the photographic lens 2. Note that the accessory-side mount 200 shown in FIG. 25 shows a state in which the mounting of the photographing lens 2 to the camera body 1 is completed (mounting completed state), that is, a state in which photographing is possible. Accordingly, the orientation of the accessory-side mount 200 shown in FIG. 25 in the vertical and horizontal directions coincides with the vertical and horizontal directions of the camera body 1. In the following description, unless otherwise specified, the orientation of the accessory-side mount 200 in the up / down / left / right directions is the orientation in the mounted state.

  The accessory-side mount 200 has a bayonet structure in which three claws (accessory-side claws) that are spaced apart from each other in the circumferential direction protrude from the inner side to the outer side of the circumference. Of the three accessory side claws, the uppermost accessory side claw is referred to as an accessory side first claw 210, and the accessory side second claw 220 and the accessory side in order from the accessory side first claw 210 toward the illustrated clockwise direction. This is called the third claw 230.

  A space between two adjacent accessory-side claws through which the body-side claws pass when the taking lens 2 is inserted and removed is referred to as an accessory-side groove, as will be described later. The accessory-side groove between the accessory-side first claw 210 and the accessory-side second claw 220 is referred to as an accessory-side first groove 251, and the accessory-side second groove sequentially from the accessory-side first groove 251 toward the illustrated clockwise direction. 252 and called the accessory-side third groove 253.

  The rear surface of the accessory side first claw 210 is called a rear surface 213, the side end facing the accessory side first groove 251 is called a first side end 211, and the side end facing the accessory side third groove 253 is a second side end. Called 212. Similarly, the rear surface of the accessory-side second claw 220 is referred to as a rear surface 223, the side end facing the accessory-side second groove 252 is referred to as the first side end 221, and the side end facing the accessory-side first groove 251 is the first end. Called the two side end 222. The rear surface of the accessory side third claw 230 is called a rear surface 233, the side end facing the accessory side third groove 253 is called a first side end 231, and the side end facing the accessory side second groove 252 is a second side end. Call 232. The first side ends 211, 221, and 231 face the mounting direction described later, and the second side ends 212, 222, and 232 face the direction opposite to the mounting direction (removal direction) described later. ing.

  Although not shown in FIG. 25, the front surface of the accessory-side first claw 210 is referred to as a front surface, and is denoted by reference numeral 214. Similarly, the front surface of the accessory-side second claw 220 and the front surface of the accessory-side third claw 230 are referred to as the front surface, and are denoted by reference numerals 224 and 234, respectively.

  Reference numeral 201 denotes an accessory-side mount reference surface. The accessory-side mount reference surface 201 is a donut-shaped flat surface formed toward the rear, and comes into contact with the body-side mount reference surface 101 when the mounting is completed. Reference numeral 202 denotes a fitting portion that is fitted to the inner peripheral surface 102 of the body-side mount 100 and serves as a reference for making the optical axis of the photographing lens 2 coincide with the optical axis of the camera body 1 (the central axis of the photographing optical path 3). This is a cylindrical part. Reference numeral 261 denotes a pin hole, which protrudes and emerges from the pin hole 161 of the body side mount 100 in order to fix the photographic lens 2 that has been mounted so as not to rotate with respect to the camera body 1 (body side mount 100). A lens attaching / detaching lock pin 9 is inserted.

  As shown in FIGS. 25 and 26A, 26B, the camera body 1 (body side) is attached to the front of the accessory side second claw 220 in the vicinity of the second side end 222 when the photographic lens 2 is attached or detached. A restricting member 262 for restricting the rotation range of the taking lens 2 (accessory side mount 200) with respect to the mount 100) is provided. The restriction of the rotation range by the restriction member 262 will be described in detail later. The restriction member 262 is, for example, a headed pin that is screwed from the outside in the radial direction of the accessory side mount 200. 26A is a view of the accessory-side second claw 220 in the vicinity of the second side end 222 as viewed from the rear, and FIG. 26B is an accessory-side second claw in the vicinity of the second side end 222. It is the figure which looked at 220 from the left side.

--- Positions of body side claws and body side grooves ---
FIG. 27 is a diagram illustrating the positions of the body-side claws and the body-side grooves of the body-side mount 100 when the body-side mount 100 is viewed from the front of the camera body 1. The arrangement position of the body side claw is expressed as follows in the counterclockwise angle with respect to the 3 o'clock direction when the body side mount 100 is viewed from the front of the camera body 1. The body-side first claw 110 exists in the range of 76 degrees to 130 degrees. The body-side second claw 120 exists in the range of 177.5 degrees to 226 degrees. The body side third claw 130 exists in the range of 304.5 degrees to 15 degrees (375 degrees).

  When the size of each body side claw 110 to 130 is expressed by an angle range along the periphery of the circular opening of the body side mount 100, the body side first claw 110 is 54 degrees, and the body side second claw 120 is 48 degrees. It is 5 degrees, and the body side third claw 130 is 70.5 degrees. Similarly, when the size of each of the body side grooves 151 to 153 is represented by an angle range along the periphery of the circular opening of the camera body 1, the body side first groove 151 is 61 degrees, and the body side second groove 152 is It is 47.5 degrees, and the body side third groove 153 is 78.5 degrees. That is, in the camera body side mount 100, the smallest groove is the body side second groove 152 (47.5 degrees).

  In FIG. 27, 7 is a mark indicating the position of the index provided on the camera body 1. This index serves as a mark when the photographic lens 2 is attached to the camera body 1, and its position is opposite to the 3 o'clock direction when the body side mount 100 is viewed from the front of the camera body 1. The angle in the clockwise direction is 90 degrees.

--- About the position of accessory side claw and accessory side groove ---
FIG. 28 is a diagram illustrating the positions of the accessory side claw and the accessory side groove of the accessory side mount 200 when the accessory side mount 200 is viewed from the rear of the photographing lens 2. When the accessory-side mount 200 in the above-mentioned mounting completion state of the photographic lens 2 is viewed from the rear of the photographic lens 2, the accessory-side claw disposition position is expressed by a clockwise angle with respect to the 9 o'clock direction. It becomes like this. The accessory side 1st nail | claw 210 exists in the range of 56.5 degree | times to 115 degree | times. The accessory-side second claw 220 exists in the range of 172.5 degrees to 214.5 degrees. The accessory-side third claw 230 exists in the range of 272 degrees to 343.5 degrees.

  When the length extending in the circumferential direction of the accessory-side mount 200 of each accessory-side claw 210 to 230 is represented by an angular range along the circumferential direction of the accessory-side mount 200, the accessory-side first claw 210 has 58. 5 degrees, the accessory-side second claw 220 is 42 degrees, and the accessory-side third claw 230 is 71.5 degrees. In other words, in the first to third nails on the accessory side, the angle of each nail (an angle indicating the existence range) when the length of each nail extending in the circumferential direction is regarded as an arc is an accessory. The side first claw 210 is 58.5 degrees, the accessory side second claw 220 is 42 degrees, and the accessory side third claw 230 is 71.5 degrees. That is, the smallest claw in the accessory side claw is the accessory side second claw 220 (42 degrees).

  Similarly, when the size of each accessory side groove 251 to 253 is expressed by an angle range along the circumferential direction of the accessory side mount 200, the accessory side first groove 251 is 57.5 degrees, and the accessory side second groove 252 is provided. Is 57.5 degrees, and the accessory-side third groove 253 is 73 degrees.

  In FIG. 28, 8 is a mark indicating the position of the index provided on the taking lens 2. This index serves as a mark when the photographic lens 2 is mounted on the camera body 1, and when the accessory side mount 200 in the above-described mounting completion state of the photographic lens 2 is viewed from behind the photographic lens 2. The angle in the clockwise direction with respect to the 9 o'clock direction is 130.5 degrees. This angle corresponds to an angle obtained by adding 90 ° to a mounting angle 40.5 ° described later.

  As described above, the restricting member 262 is provided in front of the accessory-side second claw 220 in the vicinity of the second-side end 222. That is, the regulating member 262 has the shortest length extending in the circumferential direction of the accessory-side mount 200 (the narrowest angle range along the circumferential direction of the accessory-side mount 200) is near the accessory-side second claw 220. Is provided.

--- Mounting the photographic lens 2 to the camera body 1 ---
The photographic lens 2 configured as described above is attached to the camera body 1 as follows. The rotational position of the photographic lens 2 relative to the camera body 1 in the state where the axis extending in the front-rear direction and the optical axis of the photographic lens 2 coincide with the center of the photographic optical path 3 of the camera body 1 is simply referred to below. This is called the insertion / extraction phase. The axis extending in the front-rear direction of the center of the photographing optical path 3 of the camera body 1 and the optical axis of the photographing lens 2 are made to coincide with each other, and the rotation position of the index provided on the photographing lens 2 and the index provided on the camera body 1 29, the accessory side mount reference surface 201 and the body side mount reference surface 101 come into contact with each other without the body side claws 110 to 130 interfering with the accessory side claws 210 to 230, as shown in FIG. The accessory side mount 200 can be inserted into the body side mount 100. The insertion / extraction phase at this time is called a normal insertion / extraction phase. FIG. 29 is a diagram showing the presence / absence (overlapping state) of interference between the body side claws 110 to 130 and the accessory side claws 210 to 230. The accessory side claws are schematically shown as fan-shaped figures. Yes.

  When the accessory-side mount 200 is inserted into the body-side mount 100 at the normal insertion / extraction phase, the accessory-side first claw 210 passes from the front to the rear of the body-side first groove 151, and the accessory-side second claw 220 is the body-side second. The accessory-side third claw 230 passes from the front to the rear of the body-side third groove 153. Similarly, when the accessory-side mount 200 is inserted into the body-side mount 100 at the normal insertion / extraction phase, the body-side first claw 110 passes from the back to the front of the accessory-side first groove 251 (not labeled in FIG. 29). The body side second pawl 120 passes from the rear to the front of the accessory side second groove 252 (not labeled in FIG. 29), and the body side third pawl 130 passes through the accessory side third groove 253 (in FIG. 29). Passes from the back to the front (not marked).

  After the accessory-side mount 200 is inserted into the body-side mount 100 at the regular insertion / extraction phase, when the photographing lens 2 is rotated counterclockwise when viewed from the front of the camera body 1, the accessory-side first claw 210 is the body-side first. The accessory side second claw 220 enters the rear side of the body side second claw 120, and the accessory side third claw 230 enters the rear side of the body side third claw 130. As described above, when the photographing lens 2 is rotated counterclockwise as viewed from the front of the camera body 1, as shown in FIG. 30, when the body side mount 100 is rotated by 40.5 degrees from the normal insertion / extraction phase. The lens attaching / detaching lock pin 9 protruding from the pin hole 161 is inserted into the pin hole 261 of the accessory side mount 200, and the rotation in the counterclockwise direction is restricted. When the photographing lens 2 is rotated counterclockwise while a lens attaching / detaching button (not shown) is pressed to retract the lens attaching / detaching lock pin 9 to the rear of the body-side mount reference surface 101, the restricting member 262 becomes the body. Abutting on the second side end 122 of the second side claw 120, the rotation in the counterclockwise direction is restricted.

  As described above, when the photographing lens 2 is rotated 40.5 degrees counterclockwise from the normal insertion / extraction phase, the accessory side mount 200 is coupled to the body side mount 100 (the coupling between the accessory side claw and the body side claw is performed). Completed), the mounting of the taking lens 2 is completed. The rotation angle (40.5 degrees) of the photographing lens 2 from the normal insertion / extraction phase to the phase at which the mounting of the photographing lens 2 is completed is called a mounting angle. Further, the counterclockwise rotation direction described above is also referred to as a mounting direction.

  When the mounting of the photographic lens 2 is completed, the position of the pin hole 261 of the accessory side mount 200 overlaps the position of the pin hole 161 of the body side mount 100. Then, the lens attachment / detachment lock pin 9 that protrudes and retracts from the pin hole 161 of the body side mount 100 is inserted into the pin hole 261.

--- When removing the mounted taking lens 2 from the camera body 1 ---
In the case of removing the mounted taking lens 2 from the camera body 1, the following is performed. First, a lens attaching / detaching button (not shown) provided on the camera body 1 is pressed to remove the lens attaching / detaching lock pin 9 from the pin hole 261. In this state, when the photographing lens 2 is rotated clockwise to the normal insertion / extraction phase when viewed from the front of the camera body 1, the connection between the accessory side claw and the body side claw is released. When the photographic lens 2 is rotated to the normal insertion / extraction phase, a gap of a predetermined clearance exists between the regulating member 262 and the first side end 111 of the body side first claw 120. That is, the state returns to the state shown in FIG. At the regular insertion / removal position, as described above, the body side claws 110 to 130 and the accessory side claws 210 to 230 do not interfere with each other, so that the photographing lens 2 can be removed in front of the camera body 1. When the photographing lens 2 is rotated to the normal insertion / extraction phase and further rotated in the clockwise direction, the regulating member 262 contacts the first side end 111 of the body-side first claw 120, and the clockwise rotation is regulated. Is done. The clockwise rotation direction described above is also referred to as a removal direction.

  As described above, the restriction member 262 comes into contact with the second side end 122 of the body side second claw 120 when attempting to attach the photographing lens 2 to the camera body 1 while pressing a lens attaching / detaching button (not shown). The rotation of the lens 2 in the mounting direction is restricted. Further, when the photographic lens 2 mounted is removed from the camera body 1, the restricting member 262 abuts on the first side end 111 of the body side first claw 120 and restricts rotation in the removal direction. Here, when the photographic lens 2 is mounted on the camera body 1 while pressing a lens attaching / detaching button (not shown), the end surface of the regulating member 262 that contacts the second side end 122 of the body side second claw 120 is the mounting side end surface. Call it. In addition, when the mounted taking lens 2 is removed from the camera body 1, the end surface of the regulating member 262 that contacts the first side end 111 of the body-side first claw 120 is referred to as a removal-side end surface. That is, the mounting-side end surface of the restricting member 262 is mounted from the second-side end 122 of the body-side second claw 120 in the accessory-side mount 200 inserted into the body-side mount 100 at a regular insertion / extraction phase as shown in FIG. It is separated in the clockwise direction in FIG. 29 by an angle and an angle corresponding to a predetermined clearance. Further, the removal-side end surface of the regulating member 262 is predetermined from the first-side end 111 of the body-side first claw 120 in the accessory-side mount 200 inserted into the body-side mount 100 at a regular insertion / extraction phase as shown in FIG. Is spaced counterclockwise as shown in FIG.

--- In case of trying to insert the photographic lens 2 in a phase other than the normal insertion / extraction phase ---
In the body side mount 100 and the accessory side mount 200 of the present embodiment, when the photographing lens 2 is to be inserted with a phase other than the normal insertion / extraction phase, at least two claws of the body side claws 110 to 130 and the accessory side claw The at least two claws 210 to 230 abut at a total of two or more locations, thereby prohibiting (blocking) insertion of the accessory side mount 200 into the body side mount 100.

  As can be clearly seen from FIG. 29, the rear surface 213 of the accessory-side first claw 210 can be attached even if an attempt is made to mount the photographic lens 2 in a state in which the photographic lens 2 is slightly rotated counterclockwise from the normal insertion / extraction phase. Contacts the front surface 113 of the body side first claw 110, the rear surface 223 of the accessory side second claw 220 contacts the front surface 123 of the body side second claw 120, and the rear surface 233 of the accessory side third claw 230 It contacts the front surface 133 of the three claws 130. In this case, the three claws of the body side claws 110 to 130 and the three claws of the accessory side claws 210 to 230 come into contact with each other, so that the insertion of the accessory side mount 200 into the body side mount 100 is inhibited (prohibited). The For example, in FIG. 30, it is assumed that the accessory side claws 210 to 230 are located in front of the body side claws 110 to 130.

  From the above-described state, when the photographing lens 2 is to be mounted while the photographing lens 2 is further rotated counterclockwise in the drawing, as shown in FIG. 31, the accessory-side second claw 220 has the body-side third groove 153. Accordingly, the accessory-side second claw 220 does not come into contact with the body-side claws 110-130. However, the rear surface 213 of the accessory-side first claw 210 contacts the front surface 113 of the body-side first claw 110, and the rear surface 233 of the accessory-side third claw 230 contacts the front surface 133 of the body-side third claw 130. In this case, when the two claws of the body side claws 110 to 130 and the two claws of the accessory side claws 210 to 230 abut, insertion of the accessory side mount 200 into the body side mount 100 is prohibited. Become. In FIG. 31, the number of contact points between the body-side claws 110 to 130 and the accessory-side claws that are hatched is two in total.

  In the state shown in FIG. 31, when the taking lens 2 is slightly rotated counterclockwise, the rear surface 213 of the accessory-side first claw 210 comes into contact with the front surface 123 of the body-side second claw 120. That is, when the taking lens 2 is slightly rotated counterclockwise in the figure, there are three contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230. On the other hand, when the photographing lens 2 is rotated clockwise from the state shown in FIG. 31, the area of the portion where the rear surface 213 of the accessory side first claw 210 and the front surface 113 of the body side first claw 110 abut, And the area of the part which the rear surface 233 of the accessory side 3rd nail | claw 230 and the front surface 133 of the body side 3rd nail | claw 130 contact | abut will increase.

  Therefore, in the state shown in FIG. 31, the rear surface 213 of the accessory-side first claw 210 is in contact with the front surface 113 of the body-side first claw 110, and the rear surface 233 of the accessory-side third claw 230 is the front surface of the body-side third claw 130. In this case, the area of the abutting portion is the smallest when the abutting portion 133 is in contact with only the two abutting portions. When the body-side mount 100 is viewed from the front of the camera body 1, the contact portion between the rear surface 213 of the accessory-side first claw 210 and the front surface 113 of the body-side first claw 110 in the insertion / extraction phase shown in FIG. The angle range is 11 degrees.

  As will be described later, the two claws of the body-side claws 110 to 130 and the two claws of the accessory-side claws 210 to 230 abut at a total of two locations, so that the accessory-side mount 200 has the body-side mount 100. There are other situations where the insertion of is prohibited. However, since the two claws of the body side claws 110 to 130 and the two claws of the accessory side claws 210 to 230 abut at two places in total, insertion of the accessory side mount 200 into the body side mount 100 is prohibited. Among the two contact locations, the contact location with the smaller contact area has the smallest contact area in the state shown in FIG. 31 and in FIG. In this state, the photographing lens 2 is rotated counterclockwise by 11 degrees (not shown).

  In the state in which the photographic lens 2 is rotated 11 degrees counterclockwise from the state shown in FIG. 31, the accessory-side first claw 210 rear surface 213 and the body-side first claw 110 front surface 113 do not come into contact with each other. The rear surface 213 of the side first claw 210 contacts the front surface 123 of the body side second claw 120. Note that the other contact portion is a portion where the rear surface 233 of the accessory-side third claw 230 contacts the front surface 133 of the body-side third claw 130. When the contact portion between the rear surface 213 of the accessory-side first claw 210 and the front surface 123 of the body-side second claw 120 is represented by an angle range when the body-side mount 100 is viewed from the front of the camera body 1, FIG. It is 11 degrees as in the state shown.

  That is, also in this case, there are two contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 in total. In this state, the rear surface 213 of the accessory-side first claw 210 and the front surface 123 of the body-side second claw 120 are in contact with each other, and the rear surface 233 of the accessory-side third claw 230 and the front surface 133 of the body-side third claw 130 are in contact with each other. In the case where there are two contact portions in contact, the area of the contact portion is the smallest.

  That is, the area of the contact portion between the rear surface 213 of the accessory-side first claw 210 and the front surface 113 of the body-side first claw 110 shown in FIG. Since the two claws 210 to 230 are in contact with each other at a total of two locations, the area is the smallest in a state where the insertion of the accessory side mount 200 into the body side mount 100 is prohibited. Similarly, the area of the contact portion between the rear surface 213 of the accessory-side first claw 210 and the front surface 123 of the body-side second claw 120 when the photographic lens 2 is rotated 11 degrees counterclockwise from the state shown in FIG. However, since the two claws of the body side claws 110 to 130 and the two claws of the accessory side claws 210 to 230 abut at a total of two locations, the insertion of the accessory side mount 200 into the body side mount 100 is prohibited. The area is the smallest in this state. The insertion / extraction phase shown in FIG. 31 and the insertion / extraction phase in a state where the photographic lens 2 is rotated 11 degrees counterclockwise from the state shown in FIG. 31 are referred to as a specific insertion / extraction phase.

  As described above, when the photographic lens 2 rotates counterclockwise from the state shown in FIG. 31, the rear surface 213 of the accessory-side first claw 210 is moved between the front surface 113 of the body-side first claw 110 and the body-side second claw 120. The rear surface 233 of the accessory-side third claw 230 contacts the front surface 133 of the body-side third claw 130. That is, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is three.

  Further, when the photographic lens 2 rotates counterclockwise in the figure, as described above, when the photographic lens 2 rotates 11 degrees counterclockwise in the figure from the state shown in FIG. Since the front surface 113 of the side first claw 110 does not come into contact with each other, there are a total of two places where the body side claw 110 to 130 and the accessory side claw 210 to 230 come into contact.

  Further, when the photographing lens 2 rotates counterclockwise as shown in the figure, the state shown in FIG. 32 is obtained.

  As can be clearly seen from FIG. 32, when the taking lens 2 is slightly rotated counterclockwise from the state shown in FIG. 32, the rear surface 223 of the accessory-side second claw 220 and the front surface 133 of the body-side third claw 130 Come into contact. That is, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is three. When the photographing lens 2 further rotates counterclockwise in the figure from this state, the rear surface 233 of the accessory side third claw 230 comes into contact with the front surface 113 of the body side first claw 110. That is, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is four.

  When the photographing lens 2 further rotates counterclockwise in the drawing, the rear surface 233 of the accessory side third claw 230 does not come into contact with the front surface 133 of the body side third claw 130, and then the rear surface 213 of the accessory side first claw 210 becomes the body. It will not contact the front surface 123 of the second side claw 120. That is, as shown in FIG. 33, there are a total of two places where the body side claws 110 to 130 and the accessory side claws 210 to 230 come into contact.

  33, when the photographic lens 2 is further rotated counterclockwise in the drawing, the area of the portion where the rear surface 223 of the accessory-side second claw 220 and the front surface 133 of the body-side third claw 130 abut, and the accessory The area of the portion where the rear surface 233 of the side third claw 230 abuts on the front surface 113 of the body side first claw 110 decreases. Therefore, in the state shown in FIG. 33, the rear surface 223 of the accessory-side second claw 220 and the front surface 133 of the body-side third claw 130 come into contact with each other, and the rear surface 233 of the accessory-side third claw 230 and the body-side first claw 110 In the case where the front surface 113 comes into contact and there are two contact portions, the case where the area of the contact portion is the largest is shown.

  FIG. 34 shows a state in which the photographic lens 2 is further rotated counterclockwise from the state shown in FIG. 33. The rear surface 223 of the accessory-side second claw 220 and the front surface 133 of the body-side third claw 130 come into contact with each other. In the case where the rear surface 233 of the accessory-side third claw 230 and the front surface 113 of the body-side first claw 110 are in contact with each other and there are two contact portions, the case where the area of the contact portion is the smallest is shown.

  When the photographic lens 2 is slightly rotated counterclockwise from the state shown in FIG. 34, the rear surface 213 of the accessory-side first claw 210 comes into contact with the front surface 133 of the body-side third claw 130. At this time, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is three. When the taking lens 2 further rotates counterclockwise in the figure from this state, the rear surface 233 of the accessory side third claw 230 comes into contact with the front surface 123 of the body side second claw 120. At this time, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is four.

  From this state, when the photographing lens 2 further rotates counterclockwise in the drawing, the rear surface 223 of the accessory-side second claw 220 and the front surface 133 of the body-side third claw 130 do not come into contact with each other. At this time, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is three. If the photographing lens 2 further rotates counterclockwise in the figure from this state, the rear surface 233 of the accessory side third claw 230 does not contact the front surface 113 of the body side first claw 110 as shown in FIG. At this time, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is two.

  35, when the photographic lens 2 is slightly rotated counterclockwise in the drawing, the rear surface 223 of the accessory-side second claw 220 comes into contact with the front surface 113 of the body-side first claw 110. At this time, the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is three. When the photographing lens 2 further rotates counterclockwise in the figure, the normal insertion / extraction phase shown in FIG. 29 is restored, and the body side claws 110 to 130 and the accessory side claws 210 to 230 do not contact (interfere).

--- About the reason why the regulating member 262 is provided on the accessory-side second claw 220 ---
In the present embodiment, the restriction member 262 is provided in the accessory-side second claw 220 because the following action can be expected.
(1) The accessory-side second claw 220 has the shortest length extending in the circumferential direction of the accessory-side mount 200 among the three accessories-side claws (reference numerals 210, 220, and 230). That is, the arc length of the accessory-side second claw 220 is the shortest of the three claws. For this reason, when the lens is mounted in the regular insertion / extraction phase, the interchangeable lens 2 is mounted on the camera body 1 by rotating the interchangeable lens 2 by the arc length of the accessory-side second claw 220. Become. Similarly, when the interchangeable lens 2 is removed from the camera body 1, if the interchangeable lens 2 is rotated by an amount corresponding to the arc length of the accessory-side second claw 220 (in the direction opposite to the mounting operation), the interchangeable lens is obtained. 2 can be removed from the camera body 1. That is, by providing the restriction member on the accessory-side second claw 220, the amount of rotation operation of the accessory by the user at the time of mounting and removal can be reduced. For this reason, it is possible to reduce the burden of the rotation operation required by the user when attaching / detaching the accessory (interchangeable lens 2). In addition, the time required to attach / remove the accessory (interchangeable lens 2) can be shortened.

(2) According to the present embodiment, since the rotation operation restriction when attaching the accessory and the rotation operation restriction when removing the accessory are not provided individually, one restriction member 262 serves as both. Therefore, the number of parts can be reduced and the mounting configuration can be simplified.

(3) By providing the restricting member 262 on the second claw 220, the other configuration for restricting the rotation operation of the accessory (exchangeable lens 2) when the accessory (exchangeable lens 2) is attached or removed, that is, the restricting member. As the end of the body side claw that physically contacts the 262 and restricts further rotation (the receiver side), the “end (the end of the body claw) is present at a position that is relatively difficult to damage during use. Part) ”can be used.

  This will be described below. The accessory-side second claw 220 provided with the restricting member 262 has the narrowest angle range along the periphery of the circular opening of the camera body 1 when the photographing lens 2 is attached (in the case of a regular insertion / extraction phase). Passes through the body-side second groove 152. The angle range of the body-side second groove 152 along the periphery of the circular opening of the camera body 1 is 47.5 degrees. For this reason, the accessory side 1st nail | claw 210 (angle range 58.5 degree) and the accessory side 3rd claw 230 (angle range 71.5 degree) which have an angle range larger than this angle range (47.5 degree | times) pass. Can not. Accordingly, in the phase other than the normal insertion / extraction phase, there is little possibility that the accessory-side first claw 210 and the accessory-side third claw 230 enter the body-side second groove 152, so the angle range of the body-side second groove 152 is defined. The first side end 111 of the body side first claw 110 and the second side end 122 of the body side second claw 120 are not easily damaged.

  By the way, if the first side end 111 of the body side first claw 110 and the second side end 122 of the body side second claw 120 are easily damaged, the following inconvenience occurs.

  As described above, the first side end 111 of the body-side first claw 110 abuts on the regulating member 262 when the attached photographing lens 2 is removed from the camera body 1, and the photographing lens 2 is removed more than necessary. Prevents rotation in the direction. Therefore, if the first side end 111 of the body-side first claw 110 is damaged and missing, the photographing lens 2 rotates more than necessary in the removal direction. In this case, the second side end 212 of the accessory side first claw 210 enters the rear side of the body side third claw 130, or the second side end 232 of the accessory side third claw 230 is the body side second claw 120. The photographing lens 2 cannot be removed from the camera body 1 because the camera lens 1 enters the rear side.

  As described above, the second side end 122 of the body-side second claw 120 is in contact with the regulating member 262 when the photographing lens 2 is attached to the camera body 1 while pressing a lens attaching / detaching button (not shown), The lens 2 is prevented from rotating more than necessary in the mounting direction. If the photographic lens 2 is attached to the camera body 1 while pressing a lens attaching / detaching button (not shown), the photographic lens 2 is attached until the regulating member 262 contacts the second side end 122 of the body side second claw 120. Is rotated slightly, the position of the lens attaching / detaching lock pin 9 and the position of the pin hole 261 of the accessory side mount 200 are slightly shifted.

  However, since the tip of the lens attaching / detaching lock pin 9 is rounded, if the positional deviation of the pin hole 261 is slight, the lens attaching / detaching lock is caused by the biasing force of a spring (not shown) when the user releases the lens attaching / detaching button. When the pin 9 enters the pin hole 261, the accessory side mount 200 rotated in the mounting direction more than necessary is returned to the correct phase. Alternatively, when the user releases the lens attaching / detaching button and slightly returns the photographing lens 2, the lens attaching / detaching lock pin 9 enters the pin hole 261, and the accessory side mount 200 is set to the correct phase.

  However, if the second side end 122 of the body-side second claw 120 is damaged and chipped, the lens attachment / detachment lock pin 9 is not attached when the photographic lens 2 is attached to the camera body 1 while pressing the lens attachment / detachment button (not shown). The position and the position of the pin hole 261 of the accessory side mount 200 are greatly shifted. In such a case, even if the user releases the lens attaching / detaching button, the lens attaching / detaching lock pin 9 does not enter the pin hole 261, and thus the accessory side mount 200 rotated in the attaching direction more than necessary does not return to the correct phase. As a result, an electrical contact (not shown) for transmitting and receiving signals and the like between the photographic lens 2 and the camera body 1 is displaced, resulting in inconvenience such as incapability of photographing.

  However, in the present embodiment, as described above, the first side end 111 of the body-side first claw 110 and the second side end 122 of the body-side second claw 120 are not easily damaged. It is difficult to provide a highly reliable camera system.

--- About the positional relationship between the regulating member 262 and the pin hole 261 ---
As shown in FIG. 8, in the mounting completion state, the position of the regulating member 262 is the position of the pin hole 261 (that is, the pin hole 161) with the fitting portion 202 (the optical axis of the photographing lens 2) not shown in FIG. The position on the opposite side. That is, the regulating member 262 and the pin hole 261 (pin hole 161) are disposed so as to be substantially axially symmetric with respect to the optical axis when viewed along the optical axis of the photographing lens 2.

  For example, when the gap between the cylindrical inner peripheral surface 102 of the body side mount 100 and the fitting portion 202 of the accessory side mount 200 becomes large, as shown in FIG. The lens 2) can swing with respect to the body side mount 100 (that is, the camera body 1) in the direction indicated by the arrow A around the lens attaching / detaching lock pin 9 (pin hole 261). For convenience of explanation, in FIG. 16, the swing of the accessory side mount 200 is exaggerated.

  The position change is largest due to the swinging around the lens attaching / detaching lock pin 9 at the position farthest from the lens attaching / detaching lock pin 9. Therefore, in the present embodiment, the rocking centering on the lens attaching / detaching lock pin 9 is provided in the vicinity of the regulating member 262 located on the substantially opposite side of the pin hole 261 across the fitting portion 202 (the optical axis of the photographing lens 2). The position change due to movement is the largest. Further, the direction of change of position due to the swinging around the lens attachment / detachment lock pin 9 is a tangential direction of a circle around the lens attachment / detachment lock pin 9 as shown by an arrow B in FIG.

  That is, the direction of change of the position due to the swinging around the lens attaching / detaching lock pin 9 is the contact / separation between the regulating member 262 and the second side end 122 of the body side second claw 120 in the vicinity of the regulating member 262. It is almost the same as the direction to do. Further, as described above, the mounting-side end surface of the regulating member 262 is separated from the second-side end 122 of the body-side second claw 120 by a predetermined clearance when the mounting of the taking lens 2 is completed. Not too much. Therefore, in the present embodiment, even when the gap between the cylindrical inner peripheral surface 102 of the body side mount 100 and the fitting portion 202 of the accessory side mount 200 becomes large, the restriction member 262 With the second side end 122 of the body-side second claw 120, it is possible to effectively suppress a change in the position of the photographic lens 2 due to swinging around the lens attaching / detaching lock pin 9.

  Note that the phase of the regulating member 262 in the mounting completion state may be different from the above-described phase as long as the swinging around the lens attaching / detaching lock pin 9 can be effectively suppressed. For example, a description will be given with reference to a model as shown in FIG. In the model shown in FIG. 37, it is assumed that the difference in radius between the cylindrical inner peripheral surface 102 of the body side mount 100 and the fitting portion 202 of the accessory side mount 200 is ΔR. In the model shown in FIG. 37, the center of the inner peripheral surface 102 (fitting portion 202), that is, the optical axis is the center, and the clockwise direction with respect to the 9 o'clock direction of the regulating member 262 in the mounted state is used as a reference. The angle is represented by θ. Here, the virtual radius of the cylindrical inner peripheral surface 102 of the body side mount 100 and the fitting portion 202 of the accessory side mount 200 is represented by R (= D / 2), and ΔR is a thousandth of R. Is assumed to be one size. Further, it is assumed that the distance from the center of the inner peripheral surface 102 to the center of the lens attaching / detaching lock pin 9 is R + L, and L is 0.14 times R (that is, L / R = 0.14).

  Assuming the dimensions of each part as described above, the fitting part 202 is attached to and detached from the lens by an amount allowed by the radius difference ΔR described above from the state where the center of the inner peripheral surface 102 and the center of the fitting part 202 coincide. The distance that the restricting member 262 moves in the tangential direction on the circumference of the radius R when it swings upward about the lock pin 9 is referred to as “deviation amount”. A value obtained by dividing the “shift amount” by the radius R in order to express the “shift amount” in a non-dimensional manner is referred to as a “shift amount ratio”. The relationship between this “deviation amount ratio” and θ is as shown by the curve in the graph of FIG. Since the radius R is a constant, the larger the “deviation amount ratio” value, the greater the “deviation amount” with respect to the swing amount of the fitting portion 202 around the lens attaching / detaching lock pin 9. Therefore, as the value of the “deviation amount ratio” increases, the swing of the fitting portion 202 around the lens attaching / detaching lock pin 9 is caused by the contact between the restriction member 262 and the second side end 122 of the body side second claw 120. It can be effectively suppressed. As can be seen from the graph shown in FIG. 38, as the value of θ increases, the value of “deviation amount ratio” decreases, and when the value of θ exceeds 30 degrees, the decrease in “deviation amount ratio” starts to be noticeable. Therefore, when the dimensions of the respective parts are assumed as described above, it is desirable to set the phase of the regulating member 262 in the mounting completion state so that the value of θ is 30 degrees or less.

--- About the accessory side third claw 230 ---
As described above, in the vicinity of the first side end 231 among the accessory side third claws 230, the front surface 234 is pressed by the spring 136 of the body side third claws 130 and an excessive external force is applied. 234 contacts the contact portion 135. That is, when the photographic lens 2 is attached to the camera body 1, a force for fixing the photographic lens 2 to the camera body 1 acts mainly in the vicinity of the first side end 231 in the accessory side third claw 230.

--- About the body side first nail 110 ---
In the case where there are a total of two contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230, and one of them is present on the body side first claws 110, FIGS. 34, the contact portion of the body side first claw 110 with the accessory side claws 210 to 230 is not necessarily the second side end 112 side (that is, the front surface 113 in the vicinity of the second side end 112). The first side end 111 is present (that is, the front surface 113 in the vicinity of the first side end 111). In other words, when the total number of contact points between the body side claws 110 to 130 and the accessory side claws 210 to 230 is two, and one of them is present on the body side first claws 110, erroneous insertion A blocking function is provided in the vicinity of the first side end 111 of the body-side first claw 110.

  A spring 116 is provided adjacent to the contact portion 115 in the vicinity of the second side end 112 of the body side first claw 110. That is, the vicinity of the second side end 112 of the body-side first claw 110 has a function of fixing the photographing lens 2 to the camera body 1 when the photographing lens 2 is attached to the camera body 1.

  Thus, the function is shared by the vicinity of the 1st side end 111 and the vicinity of the 2nd side end 112 along the extension direction of the body side 1st nail | claw 110. As shown in FIG.

The camera body 1 and the taking lens 2 of the second embodiment configured as described above have the following effects in addition to the effects of the first embodiment.
(1) The restriction member 262 and the pin hole 261 (pin hole 161) are arranged so as to be substantially axially symmetric with respect to the optical axis when viewed along the optical axis of the photographing lens 2. . As a result, even when the gap between the cylindrical inner peripheral surface 102 of the body-side mount 100 and the fitting portion 202 of the accessory-side mount 200 becomes large, the regulating member 262 and the body-side second claw The change in the position of the photographing lens 2 due to the swinging around the lens attaching / detaching lock pin 9 can be effectively suppressed by the second side end 122 of 120.

(2) In the present embodiment, the restriction member 262 is provided on the accessory-side second claw 220 having the shortest length extending in the circumferential direction of the accessory-side mount 200 (the shortest arc length). According to this configuration, it is possible to reduce the amount of rotation operation of the accessory by the user when the accessory is attached and removed. For this reason, it is possible to reduce the burden of the rotation operation required for the user when attaching / detaching the accessory. In addition, the time required for attachment / detachment of accessories can be shortened.

(3) According to this embodiment, the rotation operation restriction when attaching the accessory and the rotation operation restriction when removing the accessory are combined with one restriction member 262. Therefore, it is possible to reduce the number of parts and simplify the mount configuration.

(4) In this embodiment, by providing the regulating member 262 on the second claw 220, the other configuration for regulating the rotation operation of the accessory at the time of attachment / detachment of the accessory, that is, the regulating member 262 and the physical structure For systems that use "ends (ends of the body claws)" that are located at positions that are relatively difficult to damage as the ends of the body side claws that come into contact with the surface and restrict the further rotation (receiver side) it can. Thereby, the structure which implement | achieves rotation control can be made into a comparatively durable structure, As a result, durability of the mount of a bayonet structure can be improved.

  In other words, by configuring the angle range along the periphery of the circular opening of the camera body 1 of the body-side second groove 152 to be narrower than the other body-side grooves 151, 153, a phase other than the normal insertion / extraction phase Then, the accessory side first claw 210 and the accessory side third claw 230 do not enter the body side second groove 152, and the durability of the bayonet structure mount can be improved as described above.

---- Modified example ---
(1) In the above description, the accessory side claws 210 to 230 are fixed to the main body of the photographing lens 2, and when the photographing lens 2 is attached or detached, the photographing lens 2 itself is attached to or detached from the camera body 1. However, the present invention is not limited to this. For example, the accessory-side claws 210 to 230 are configured to be rotatable with respect to the main body of the photographic lens 2, and after the photographic lens 2 is mounted in a normal insertion / extraction phase, only the accessory-side claws 210 to 230 are rotated in the mounting direction. Thus, the photographing lens 2 may be configured to be attached to the camera body 1.

  FIG. 20 is a diagram illustrating an appearance of an example of the photographic lens 20 in which the accessory side claws 210 to 230 are configured to be rotatable with respect to the main body of the photographic lens 2. The taking lens 20 is provided so as to be rotatable with respect to the lens barrel 21 and the lens barrel 21, and an operation for rotating the bayonet tube 22 with respect to the lens barrel 21. And a ring 23. In FIG. 20 and each figure described below, the same members as those described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 21 is a diagram showing the appearance of the lens barrel 21, and FIG. 22 is a diagram schematically showing the structure of the taking lens 20. As shown in FIG. 21, a fitting groove 21 a into which the operation ring 23 is fitted is provided at the rear part of the barrel 21. At the bottom of the fitting groove 21a, a long hole 21b is provided so that the pin 24 connecting the operation ring 23 and the bayonet tube 22 can be moved. 22 (a) and 22 (d), the operation ring 23 is fitted in the fitting groove 21a of the lens barrel 21, and the operation ring 23 and the bayonet tube 22 are connected by a pin 24. It is connected. Reference numeral 25 denotes a lens. In the photographic lens 20 configured as described above, when the operation ring 23 is rotated with respect to the lens barrel 21, the bayonet tube 22, that is, the accessory side claws 210 to 230 rotate with respect to the lens barrel 21. . By using the photographic lens 20 configured as described above, after mounting the photographic lens 20 with a normal insertion / extraction phase, the operating ring 23 is operated to rotate only the bayonet cylinder 22 in the mounting direction, thereby allowing the lens barrel 21 to be rotated. The photographing lens 20 can be attached to the camera body 1 without rotating the lens. In addition, FIG.22 (d) is CC sectional view taken on the line of Fig.22 (a).

(2) In the above description, the photographing lenses 2 and 20 have been described as an example of a camera accessory. However, the present invention is not limited to this, and for example, a converter lens that changes the focal length or a mounting surface of the photographing lens. Various camera accessories having an accessory-side mount 200 that can be coupled to the body-side mount 100, such as an adapter that changes the distance from the imaging surface to the imaging surface, may be used.

(3) In the above description, the restricting member 262 is a headed pin attached to the accessory side mount 200, but other members are not attached. For example, the restricting member 262 is located near the second side end 222. You may make it form in such a shape. That is, for example, when the accessory-side mount 200 is a resin injection-molded product, the vicinity of the second side end 222 may be injection-molded so as to have a shape like the regulating member 262. In addition, for example, the restriction member 262 includes two pins: a first pin having the mounting side end surface described above, and a second pin having a removal side end surface described above, which is a pin different from the first pin. It may be configured. Further, instead of attaching other members like the first and second pins, for example, the vicinity of the second side end 222 may be formed in a shape like the first and second pins. .

(4) In the above description, the body side mount 100 may be provided on the photographing lens 2, and the accessory side mount 200 may be provided on the camera body 1.
(5) In the above embodiments, the camera system including the camera body 1 and the interchangeable lens 2 has been described. However, the present invention is not limited to the camera system. Any device provided with a mount to which the interchangeable lens 2 can be attached and detached is applicable not only to the camera. As such a device, for example, an electronic device such as a projector can be considered. By configuring the projection lens portion of the projector as a detachable exchangeable projection lens, a system similar to the above embodiment can be obtained.
(6) The above-described embodiments and modifications may be combined.

  The present invention is not limited to the embodiment described above, and is an accessory that can be attached to and detached from the camera body including the camera body side mount, and has a cylindrical portion having an optical path on the inner peripheral side. An accessory of a bayonet structure having first to third claws arranged on the outer peripheral surface of the cylindrical portion and spaced from each other along the circumferential direction of the outer peripheral surface and projecting radially outward from the outer peripheral surface In a camera accessory having a side mount, when the accessory side mount is inserted into the camera body side mount at a normal insertion / extraction phase, all of the first to third claws are provided on the camera body side mount. The first to third claws are arranged on the accessory side mount so that insertion into the camera body side mount is allowed without being obstructed by the three camera body side claws. The first to third nails have different lengths extending in the circumferential direction, and the first nail has the longest length extending in the circumferential direction among the first to third nails. The third claw has the shortest length extending in the circumferential direction among the first to third claws, and the accessory-side mount includes a regulating member provided in the vicinity of the third claw, a camera A lock pin hole for restricting rotation of the camera accessory relative to the camera body by inserting a lock pin provided on the body, and the restricting member sandwiches the center of the cylindrical portion, The cylindrical part includes a camera accessory having various structures characterized in that a part along the circumferential direction is omitted.

DESCRIPTION OF SYMBOLS 1 Camera body 2,20 Shooting lens 9 Lens attachment / detachment lock pin 100 Body side mount 110 Body side 1st nail | claw 115,125,135 Contact part 116,126,136 Spring 120 Body side 2nd nail 130 Body side 3rd nail | claw 200 Accessory side mount 210 Accessory side first claw 220 Accessory side second claw 230 Accessory side third claw 261 Pin hole 262 Restricting member 271 First cylindrical wall part 272 Virtual second cylindrical wall part 272B Second cylindrical wall part 273 Third cylinder Wall part 274, 275 Notch part 280 Opening 281 Protruding part

Claims (6)

An accessory that can be attached to and detached from a camera body that includes a camera body side mount, and that includes a cylindrical portion having an optical path on the inner peripheral side, along the circumferential direction of the outer peripheral surface on the outer peripheral surface of the cylindrical portion In a camera accessory comprising a bayonet-structured accessory-side mount having first to third claws disposed apart from each other and projecting radially outward from the outer peripheral surface,
When the accessory side mount is inserted into the camera body side mount at a normal insertion / extraction phase, all of the first to third claws are provided on the camera body side mount. The first to third claws are disposed on the accessory side mount so that insertion into the camera body side mount is permitted without being obstructed by the claws,
The first to third claws have different lengths extending in the circumferential direction,
The length of the first claw extending in the circumferential direction is the longest among the first to third claws,
The third claw has the shortest length in the circumferential direction among the first to third claws,
The accessory side mount is
A regulating member provided in the vicinity of the third claw;
A lock pin hole for restricting rotation of the camera accessory with respect to the camera body by inserting a lock pin provided in the camera body;
With
The regulating member is provided at a position substantially opposite to the lock pin hole across the center of the cylindrical portion,
An accessory for a camera, wherein the cylindrical portion is partially omitted along a circumferential direction. The camera accessory according to claim 1,
An accessory for a camera, wherein the part of the cylindrical portion along the circumferential direction has an end face facing the camera body side mount. The camera accessory according to claim 1,
An accessory for a camera, wherein an outer peripheral surface of the part of the cylindrical portion along the circumferential direction is missing. In the accessory for cameras as described in any one of Claims 1-3,
An accessory for a camera, characterized in that a protrusion projecting radially inward is provided on an inner peripheral surface of the cylindrical portion. The camera accessory according to claim 4,
A camera accessory, wherein a plurality of the protrusions are provided along the inner peripheral surface. In the accessory for cameras as described in any one of Claims 1-3,
The camera accessory, wherein the opening on the inner peripheral side of the cylindrical portion has a polygonal shape.

Images