JP2009042639A - Lens barrel and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collapsible lens barrel for reducing the number of cylinder members, effectively using an inner space, and further, shortening the collapsible length. <P>SOLUTION: In the lens barrel, a first optical system holding frame 8 has a part to be engaged of regulating the rotation of a second optical system holding frame 6, and the second optical system holding frame 6 is provided with an engagement part being engaged with the part to be engaged along the optical axial direction. The end part of the imaging side of the engagement part is located closer to the side of the image forming side than a lens group 3 held by the first optical system holding frame 8 in a SINK state and a TELE state, and is located closer to the object side than the lens group 3 held by the first optical system holding frame 8 in a WIDE state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a collapsible lens barrel having a zooming function and mounted on an imaging apparatus such as a digital camera, and an imaging apparatus including the lens barrel.

  An example of a conventional retractable lens barrel having a zooming function is shown in FIG.

  The lens barrel shown in FIG. 9 is an optical system including a first group lens 101, a second group lens 102, a third group lens 103, and a fourth group lens 104. Each lens group includes a first group holding frame 105, 2 The group holding frame 106, the third group holding frame 108, and the fourth group holding frame 109 are held. The shutter unit 107 is held by the third group holding frame 108.

  The first group holding frame 105 has, for example, six first group cam pins 105a in the circumferential direction, and the second group holding frame 106 has, for example, three second group cam pins 106a in the circumferential direction. The third group holding frame 108 also has, for example, three third group cam pins 108a in the circumferential direction.

  The first group cam pin 105 a is fitted to the first group cam 110 a provided on the outer peripheral surface of the rotating cam cylinder 110, and the second group cam pin 106 a and the third group cam pin 108 a are provided on the inner peripheral surface of the rotating cam cylinder 110. The second and third group cams 110b are fitted.

  A first group rectilinear cylinder 111 is disposed on the outer peripheral side of the first group holding frame 105, and a second and third group rectilinear cylinder 112 is disposed between the rotary cam cylinder 110 and the second group holding frame 106 and the third group holding frame 108. Be placed.

  The first group rectilinear cylinder 111 has, for example, six first group rectilinear grooves 111c in the circumferential direction on the inner peripheral surface, and the first group holding frame 105 has engagement protrusions 105b in six locations on the outer peripheral surface in the circumferential direction, for example. . The first group rectilinear groove 111c and the engaging protrusion 105b are fitted, and the first group holding frame 105 is restricted from rotating with respect to the first group rectilinear cylinder 111.

  In the second and third group rectilinear cylinders 112, straight rectilinear grooves 112b through which the second group cam pins 106a and engaging projections 106b around the second group cam pins 106a are inserted are inserted, and third group cam pins 108a and engaging projections 108b around the third group cam pins are inserted. And a rectilinear groove 112b.

  The engaging protrusion 106b and the engaging protrusion 108b are fitted in the rectilinear groove 112b and the rectilinear groove 112b, respectively, so that the second group holding frame 106 and the third group holding frame 108 are in relation to the second and third group rectilinear cylinders 112. Rotation is restricted.

  The second and third group rectilinear cylinders 112 have, for example, engaging projections 112c at six positions on the outer peripheral surface of the end portion on the objective side, and the first group holding frame 105 is formed at, for example, six positions on the inner peripheral surface in the circumferential direction. It has a straight groove (not shown).

  The engaging projection 112 c of the second and third group rectilinear cylinder 112 and the straight groove 105 c (not shown) of the first group holding frame 105 are fitted, and the second and third group rectilinear cylinder 112 rotates with respect to the first group holding frame 105. Is regulated.

  The second and third group rectilinear cylinders 112 have projections 112d at six positions in the circumferential direction of the outer peripheral surface of the end on the imaging side, and both ends of the rotating cam cylinder 110 are sandwiched between the protrusions 112d and the engaging protrusions 112c. The rotary cam cylinder 110 moves linearly and integrally with the rotary cam 110 so as to be rotatable.

  A drive cylinder 113 is disposed on the outer peripheral side of the first group rectilinear cylinder 111, and a fixed cylinder 114 is disposed on the outer peripheral side of the drive cylinder 113.

  The rotating cam cylinder 110 has, for example, six cam pins 110 c, and the cam pins 110 c pass through a rectilinear groove 113 b provided in the drive cylinder 113, and a cam 114 a provided on the inner periphery of the fixed cylinder 114. To fit.

  For example, three cam pins 111a and three engaging projections 111b are provided on the outer periphery of the first group straight cylinder 111.

  The cam pin 111a is fitted to a cam 113a provided on the inner periphery of the drive cylinder 113, and the engagement protrusion 111b is fitted to a rectilinear groove 114b provided on the inner periphery of the fixed cylinder 114. The rectilinear cylinder 111 is restricted from rotating with respect to the fixed cylinder 114.

  The first group rectilinear cylinder 111, the first group holding frame 105, the second and third group rectilinear cylinder 112, the second group holding frame 106, and the third group holding frame 108 are restricted from rotating with respect to the fixed cylinder 114, as described above. Only straight running is possible.

  The drive cylinder 113 has a gear 113c formed on a part of the outer periphery of the end on the image forming side. A driving force from a driving source (not shown) is transmitted to the driving cylinder 113 via the gear 113c, and the driving cylinder 113 rotates.

  The rotating cam cylinder 110 rotates in conjunction with the rotation of the drive cylinder 113 and moves straight along the cam 114a of the fixed cylinder 114 in the optical axis direction. At the same time, the first group rectilinear cylinder 111 moves straight in the optical axis direction along the cam 113 a of the drive cylinder 113, and the first group holding frame 105, the second group holding frame 106, and the third group holding frame 108 are connected to the rotating cam cylinder 110. It moves straight in the optical axis direction along the cams 110a and 110b.

  In the lens barrel configured as described above, seven cylindrical members are required from the second group holding frame 106 or the third group holding frame 108 to the outermost fixed cylinder 114 of the lens barrel.

  That is, the second group holding frame 106 or the third group holding frame 108, the second and third group rectilinear cylinders 112, the rotating cam cylinder 110, the first group holding frame 105, the first group rectilinear cylinder 111, the drive cylinder 113, and the fixed cylinder 114 A cylindrical member is required.

  Therefore, in order to reduce the diameter of the lens barrel, it is necessary to reduce the number of cylinder members between the second group holding frame 106 or the third group holding frame 108 of the innermost cylinder and the fixed cylinder 114 of the outermost cylinder. It is.

  As a lens barrel having a reduced number of cylindrical members, for example, a straight-advancing cylinder that restricts the rotation of the first group holding frame is unnecessary, and the second group holding frame also serves as a member that restricts the rotation of the first group holding frame. Has been proposed (Patent Document 1).

  FIG. 10 shows a configuration when this content is applied to the lens barrel of FIG. 9 described above.

As shown in FIG. 10, the third group holding frame 108 has the second and third group rectilinear cylinders 112 of FIG. 9, and the engaging protrusion 106 b around the second group cam pin 106 a is a rectilinear groove of the third group holding frame 108. 108c is fitted. Other members are the same as those in FIG.
Japanese Patent Laid-Open No. 2003-270509

  By the way, in the above-mentioned patent document 1, when the distance between the second and third groups from the retracted state to the imaging state or from the WIDE state to the TELE state is large, the length L6 or the length L8 is shown in FIG. It is necessary to lengthen in the direction of the arrow.

  That is, the length L6 from the base plate of the second group holding frame 106 to the cam pin 106a is increased in the arrow direction in the figure, or the length L8 of the rectilinear groove 108c of the third group holding frame 108 is increased in the arrow direction in the figure. Therefore, it is necessary to ensure a long range for restricting rotation.

  However, if the length L6 from the base plate of the second group holding frame 106 to the cam pin 106a is increased, the second group holding frame 106 may interfere with the third group holding frame 108 when retracted. For this reason, in order to avoid the interference, it is necessary to make a part of the third group holding frame 108, for example, a concave shape 108e, and the front projection area of the third group holding frame 108 viewed from the objective side becomes small.

  Similarly, a part of the adjacent shutter unit 107 needs to have a concave shape, and the front projection area of the shutter unit 107 is reduced. For this reason, for example, there is a problem that the internal mechanism cannot be arranged in the shutter unit 107.

  On the other hand, when the length L8 of the rectilinear groove 108c of the third group holding frame 108 is increased, the first group holding frame 105 may interfere with the objective end of the third group holding frame 108 when retracting. . For this reason, in order to avoid the interference, it is necessary to make a part of the first group holding frame 105 concave in the objective direction, and the retractable length becomes long.

  Therefore, the present invention includes a lens barrel that can reduce the number of cylindrical members, can effectively use the internal space, and can further reduce the retractable length, and the lens barrel. An object is to provide an imaging device.

  In order to achieve the above object, the lens barrel of the present invention is a collapsible lens barrel capable of zooming by moving a plurality of optical system holding frames in the optical axis direction. The first optical system holding frame of the frames includes an engaged portion that restricts rotation of at least one other second optical system holding frame, and the second optical system holding frame is the engaged plate. An engagement portion that can be engaged with the joining portion along the optical axis direction is provided, and an end portion on the imaging side of the engagement portion is in a first state between the retracted state and the imaging state. The lens group which is positioned on the image forming side with respect to the lens group held by the first optical system holding frame and is held by the first optical system holding frame in the second state between the retracted state and the imaging state. It is characterized by being located on the objective side.

  An image pickup apparatus according to the present invention is an image pickup apparatus including an image pickup element that photoelectrically converts a subject image, and includes the lens barrel according to any one of claims 1 to 9.

  According to the present invention, the number of cylindrical members can be reduced, the internal space can be used effectively, and the retractable length can be shortened.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  1 is an exploded perspective view for explaining a lens barrel as an example of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the lens barrel shown in FIG. 1, and (a) is a SINK (collapsed) state. , (B) is the WIDE state, and (c) is the TELE state.

  In the present embodiment, a two-stage collapsible lens barrel having a zooming function mounted on an imaging apparatus such as a digital camera having an imaging element that photoelectrically converts a subject image is taken as an example.

  As shown in FIG. 1, the lens barrel of the present embodiment includes a plurality of first group lenses 1, 2 group lenses (2 group optical systems) 2, 3 group lenses (3 group optical systems) 3, and 4 group lenses 4. An optical system including a lens group is provided. The lens groups 1 to 4 are held by the first group holding frame 5, the second group holding frame 6, the third group holding frame 8, and the fourth group holding frame 9, respectively.

  The first group holding frame 5 has six first group cam pins 5a in the circumferential direction, and the second group holding frame 6 has three second group cam pins 6a in the circumferential direction. Further, the third group holding frame 8 also has three third group cam pins 8a in the circumferential direction, and the shutter unit 7 also has three shutter cam pins 7a in the circumferential direction.

  The first group cam pin 5 a is fitted to the first group cam 10 a provided on the outer peripheral surface of the rotating cam cylinder 10. The second group cam pin 6a, the shutter cam pin 7a, and the third group cam pin 8a are fitted to the second group cam 10b, the shutter cam 10c, and the third group cam 10d provided on the inner peripheral surface of the rotating cam cylinder 10, respectively.

  The first group rectilinear cylinder 11 is disposed on the outer peripheral side of the first group holding frame 5, and the fixed cylinder 12 is disposed on the outer peripheral side of the first group rectilinear cylinder. The first group rectilinear cylinder 11 has first group rectilinear grooves 11b at six locations in the circumferential direction of the inner peripheral surface, and the first group holding frame 5 has engagement protrusions 5b at six locations in the circumferential direction of the outer peripheral surface.

  The first group rectilinear groove 11 b and the engaging protrusion 5 b are fitted, and the first group holding frame 5 is restricted from rotating with respect to the first group rectilinear cylinder 11.

  An engagement protrusion whose rotation is restricted with respect to the third group holding frame (first optical system holding frame) 8 on the inner periphery of the image forming side end of the second group holding frame (second optical system holding frame) 6. (Engaging part) 6b1 and 6b2 (refer FIG. 3) are each provided in three places in the circumferential direction.

  The third group holding frame 8 has a cylindrical shape extending toward the objective side, and the cylindrical projections are engaged surfaces (engaged portions) whose engagement projections 6b1 and 6b2 are engaged to restrict rotation. ) The rectilinear grooves 8b having 8b1 and 8b2 are provided at three locations in the circumferential direction.

  The shutter unit 7 has an engaging protrusion 7 b around the cam pin 7 a, and the engaging protrusion 7 b engages with the rectilinear groove 8 c of the third group holding frame 8. Therefore, the rotation of the second group holding frame 6 and the shutter unit (aperture shutter device: third optical system holding frame) 7 is restricted with respect to the third group holding frame 8.

  The third group holding frame 8 has a tapered surface at the objective end of the rectilinear groove 8c. The tapered surface 8e plays a role of guiding the shutter unit 7 to the initial phase of incorporation of the rotating cam cylinder 10. .

  FIG. 5 is a development view of the inner peripheral surface of the rotating cam cylinder 10.

  As shown in FIG. 5, in this embodiment, the initial phase A of the retracted state of the shutter cam 10c is located on the left side in the drawing with respect to the initial phase B of the third group cam 10d. Therefore, if the built-in cam is pulled toward the image forming side (the lower side in the figure) of the rotating cam cylinder 10 in the immediate vicinity of the initial phase A of the shutter cam 10c, it interferes with the third group cam 10d. Therefore, the built-in cams of the shutter cam 10c and the third group cam 10d are made common as the built-in cam 10h.

  To explain from the order of assembly, when the shutter cam pin 7a of the shutter unit 7 is first assembled from the assembly cam 10h, the shutter cam pin 7a is first positioned at 10c '.

  Next, when the third group cam pin 8a of the third group holding frame 8 is assembled from the built-in cam 10h, the shutter cam pin 7a extends along the taper surface 8e provided in the straight movement groove 8c of the third group holding frame 8, and the straight movement groove 8c. And is guided to the initial phase A of the shutter cam 10c.

  The first group rectilinear cylinder 11 has engaging protrusions 11a at six locations in the circumferential direction of the outer peripheral surface, and the fixed cylinder 12 has rectilinear grooves 12b at six locations in the circumferential direction of the inner peripheral surface. The protrusion 11 a and the rectilinear groove 12 b are fitted, and the rotation of the first group rectilinear cylinder 11 is restricted with respect to the fixed cylinder 12.

  Further, as shown in FIG. 4, the first-group rectilinear cylinder 11 includes a groove 11 c and two notches 11 d on the inner periphery of the end on the image forming side. The rotating cam cylinder 10 has an engaging protrusion 10e on the outer periphery of the end on the image forming side.

  The engaging projection 10e is inserted from the notch portion 11d of the first group rectilinear cylinder 11 and is positioned in the groove 11c, and the rotary cam cylinder 10 is rotated relative to the first group rectilinear cylinder 11 to thereby rotate the first group rectilinear cylinder. 11 and the rotating cam cylinder 10 are coupled and linearly move together.

  The third group holding frame 8 has three engaging projections 8d in the circumferential direction on the flange provided at the image forming side end, and these engaging projections 8d are fitted with the straight advance grooves 12b of the fixed cylinder. The third group holding frame 8 is restricted from rotating with respect to the fixed cylinder 12.

  As described above, the first group rectilinear cylinder 11, the first group holding frame 5, the third group holding frame 8, the second group holding frame 6, and the shutter unit 7 are restricted in rotation with respect to the fixed cylinder 12, and can only perform a rectilinear operation. Become.

  A drive cylinder 13 is disposed on the outer peripheral side of the fixed cylinder 12, and a cover cylinder 14 is disposed on the outer peripheral side of the drive cylinder 13. Each of the rotating cam cylinders 10 has six cam pins 10f and drive pins 10g.

  The cam pin 10 f is fitted to a rotating cam 12 a provided on the inner periphery of the fixed cylinder 12, and the drive pin 10 g is inserted into a groove portion 12 c provided on the fixed cylinder 12 to be connected to the inner periphery of the drive cylinder 13. It fits in the provided rectilinear groove 13b.

  The drive cylinder 13 has a gear 13a formed on a part of the outer periphery of the end on the image forming side. A driving force from a driving source (not shown) is transmitted to the gear 13a, whereby the driving cylinder 13 is rotationally driven.

  Next, an operation example of the lens barrel configured as described above will be described.

  When a driving force from a driving source (not shown) is transmitted to the gear 13a formed on the driving cylinder 13, the driving cylinder 13 is rotationally driven.

  When the drive cylinder 13 rotates, the rotation cam 13b is caused by the action of the rectilinear groove 13b of the drive cylinder 13 and the drive pin 10g of the rotation cam cylinder 10, and the action of the cam pin 10f of the rotation cam cylinder 10 and the rotation cam 12a of the fixed cylinder 12. The cylinder 10 moves while rotating along the optical axis direction.

  The rotation of the first group holding frame 5 is restricted by the first group rectilinear cylinder 11 and the engaging protrusion 5b, and the rotation of the first group rectilinear cylinder 11 is restricted by the fixed cylinder 12 and the engaging protrusion 11a.

  For this reason, when the rotating cam cylinder 10 rotates, the first group holding frame 5 does not rotate by the action of the first group cam 10a on the outer peripheral surface of the rotating cam cylinder 10 and the cam pin 5a of the first group holding frame 5. Move straight along the axial direction.

  The amount of movement of the first group holding frame 5 at this time is the total amount of movement of the first cam frame 10 and the amount of movement of the first group holding frame 5 by the first group cam 10a.

  The rotation of the second group holding frame 6 is restricted by the third group holding frame 8 and the engagement protrusions 6b1 and 6b2, and the rotation of the third group holding frame 8 is restricted by the fixed cylinder 12 and the engagement protrusion 8d.

  Therefore, when the rotating cam cylinder 10 rotates, the second group holding frame 6 does not rotate due to the action of the second group cam 10b on the inner peripheral surface of the rotating cam cylinder 10 and the cam pin 6a of the second group holding frame 6. It moves straight along the optical axis direction.

  The movement amount of the second group holding frame 6 at this time is a total movement amount of the movement amount by the rotating cam cylinder 10 and the movement amount of the second group holding frame 6 by the second group cam 10b.

  The rotation of the shutter unit 7 is restricted by the third group holding frame 8 and the engaging protrusion 7b, and the rotation of the third group holding frame 8 is restricted by the fixed cylinder 12 and the engaging protrusion 8d.

  For this reason, when the rotating cam cylinder 10 rotates, the shutter unit 7 does not rotate and moves along the optical axis direction by the action of the shutter cam 10c on the inner peripheral surface of the rotating cam cylinder 10 and the cam pin 7a of the shutter unit 7. Go straight ahead.

  The movement amount of the shutter unit 7 at this time is a total movement amount of the movement amount by the rotating cam cylinder 10 and the movement amount of the shutter unit 7 by the shutter cam 10c.

  Since the rotation of the third group holding frame 8 is restricted by the fixed cylinder 12 and the engaging projection 8d, when the rotating cam cylinder 10 rotates, the third group cam 10d and the third group holding of the inner peripheral surface of the rotating cam cylinder 10 are retained. Due to the action of the frame 8 with the cam pin 8a, the frame 8 moves straight along the optical axis direction without rotating.

  The movement amount of the third group holding frame 8 at this time is the total movement amount of the movement amount by the rotating cam cylinder 10 and the movement amount of the third group holding frame 8 by the third group cam 10d.

  The fourth group holding frame 9 is controlled independently of the first group holding frame 5, the second group holding frame 6, the shutter unit 7, and the third group holding frame 8 by a driving mechanism such as a feed screw by a driving source (not shown). Driven.

  6 is a perspective view of the lens barrel assembly of the second group holding frame 6, the shutter unit 7, and the third group holding frame 8 constituting the lens barrel shown in FIG. 1, and (a) is a SINK of the lens barrel. The (collapsed) state, (b) is the WIDE state of the lens barrel, and (c) is the TELE state of the lens barrel.

  7 is a side view of the lens barrel assembly shown in FIG. 6, and FIG. 8 is a cross-sectional view of the lens barrel assembly shown in FIG.

  6 to 8, in the SINK (collapsed) state and the TELE state (first state) of the lens barrel, the distance between the second group holding frame 6 and the third group holding frame 8 becomes short, and the WIDE state (second state). In this state, the distance between the second group holding frame 6 and the third group holding frame 8 becomes longer.

  Thus, in the lens barrel of this embodiment, the distance difference between the second group holding frame 6 and the third group holding frame 8 from the SINK (collapsed) state to the imaging state or from the WIDE state to the TELE state is large.

  Here, in this embodiment, the rectilinear groove 8b having the engagement surfaces 8b1 and 8b2 formed in the third group holding frame 8 is greatly cut out on the image forming side.

  For this reason, when the lens barrel is in the SINK (collapsed) state or the TELE state, the image forming side end C (see FIGS. 8A and 8C) of the second group holding frame 6 is the third group lens 3. The third group holding frame 8 is located at the image forming side end of the third group holding frame 8 across the image forming side end D.

  Further, in the WIDE state of the lens barrel, the end C on the imaging side of the second group holding frame 6 (see FIG. 8B) straddles the third group lens 3 and the end of the third group holding frame 8 on the objective side. Located near the part E.

  As a result, the second group holding frame 6 can move over substantially the entire length of the lens barrel length of the third group holding frame 8. As a result, the range in which the rotation of the second group holding frame 6 and the third group holding frame 8 is restricted can be secured long in the optical axis direction, so that the retractable length of the lens barrel can be shortened.

  Further, since the third group holding frame 8 restricts the rotation of the second group holding frame 6 and the shutter unit 7, it is possible to omit the straight cylinder that has been provided independently, and to reduce the number of cylinder members. .

  Further, by omitting the rectilinear cylinder, the diameters of the second group holding frame 6, the third group holding frame 8, and the like can be reduced by the thickness of the rectilinear cylinder.

  Furthermore, since the cylindrical shape that holds the engagement protrusions 6b1 and 6b2 of the second group holding frame 6 is located on the outer peripheral side of the outer diameter of the lens barrel of the third group holding frame 8, the third group holding frame 8 and the shutter unit 7 are used. Can be used effectively.

  Furthermore, in the lens barrel of this embodiment, as shown in FIG. 7, the cam pins 6a of the second group holding frame 6, the cam pins 7a of the shutter unit 7, and the cam pins 8a of the third group holding frame 8 are arranged adjacent to each other in the circumferential direction. can do. Note that when the rotation of the second group holding frame 6 is restricted by providing an engaging projection around the cam pin, the straight movement groove that restricts the rotation of the second group holding frame 6 and the shutter unit 7 is connected, and it does not work as a straight cylinder. In the present embodiment, the rotation restriction of the second group holding frame 6 is performed separately from the second group cam pin 6a, so that the cam pins can be arranged close to each other.

  In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

  For example, in the above-described embodiment, a two-stage collapsible type lens barrel having a four-group lens configuration is illustrated. However, the present invention is not limited to this, and a one-stage or three-stage or more retractable lens barrel or a four-group lens is used. The present invention may be applied to a lens barrel having a lens configuration other than the configuration.

  In the above-described embodiment, the case where the third group holding frame 8 restricts the rotation of the second group holding frame 6 and the shutter unit 7 is exemplified. However, the present invention is not limited to this, and one optical system holding frame is the optical system. The present invention can be applied to any configuration that restricts the rotation of the optical system holding frame other than the holding frame.

  Furthermore, in the above embodiment, the configuration in which the shutter unit is driven independently from the other optical system holding frame is exemplified, but the present invention is not limited to this, and the shutter unit is held by the other optical system holding frame. However, the present invention is applicable.

It is a disassembled perspective view for demonstrating the lens-barrel which is an example of embodiment of this invention. 2A and 2B are cross-sectional views of the lens barrel shown in FIG. 1, wherein FIG. 1A shows a SINK state, FIG. 1B shows a WIDE state, and FIG. 1C shows a TELE state. It is a perspective view which shows the 2nd group holding frame which comprises the lens-barrel shown in FIG. It is a perspective view which shows the 1st group rectilinear cylinder which comprises the lens barrel shown in FIG. FIG. 2 is a development view of an inner peripheral surface of a rotary cam cylinder that constitutes the lens barrel shown in FIG. 1. 2 is a perspective view of a lens barrel assembly of a second group holding frame, a shutter unit, and a third group holding frame constituting the lens barrel shown in FIG. 1, (a) is a sink state, (b) is a WIDE state, ) Is the TELE state. FIG. 7 is a side view of the lens barrel assembly shown in FIG. 6, where (a) is a SINK state, (b) is a WIDE state, and (c) is a TELE state. FIG. 7 is a cross-sectional view of the lens barrel assembly shown in FIG. 6, where (a) is a SINK state, (b) is a WIDE state, and (c) is a TELE state. It is a disassembled perspective view for demonstrating an example of the retractable lens barrel which has the conventional zoom function. FIG. 10 is a cross-sectional view of the lens barrel shown in FIG. 9, in which (a) is a SINK state and (b) is a WIDE state. FIG. 10 is a cross-sectional view illustrating a configuration example when the content of Japanese Patent Application Laid-Open No. 2003-270509 is applied to the lens barrel illustrated in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1 group lens 2 2 group lens 3 3 group lens 4 4 group lens 5 1 group holding frame 5a 1 group cam pin 5b 1 group engaging protrusion 6 2 group holding frame 6a 2 group cam pin 6b1 2 group engaging protrusion 6b2 2 groups Joint projection 7 Shutter unit 7a Shutter cam pin 7b Shutter engagement projection 8 3rd group holding frame 8a 3rd group cam pin 8b1 3rd group engagement surface 8b2 3rd group engagement surface 8b Rectilinear groove 8c 3rd group rectilinear groove 8d 3rd group engagement projection 8e 3 Group taper surface 9 Group 4 holding frame 10 Rotating cam cylinder 10a Group 1 cam 10b Group 2 cam 10c Shutter cam 10d Group 3 cam 10e Rotating cam engaging projection 10f Rotating cam pin 10g Rotating cam drive pin 10h Built-in cam 11 Group 1 rectilinear cylinder 11a 1 Group rectilinear cylinder engaging protrusion 11b Group 1 rectilinear cylinder rectilinear groove 11c Group 1 rectilinear cylinder groove portion 11d Group 1 rectilinear cylinder notch portion 12 Fixed cylinder 12a Rotating cam 12b Fixed cylinder rectilinear Advance groove 12c Fixed cylinder groove portion 13 Drive cylinder 13a Drive cylinder gear 13b Drive cylinder straight advance groove 14 Cover cylinder 15 Image sensor base plate

Claims (10)

In a retractable lens barrel capable of zooming by moving a plurality of optical system holding frames in the optical axis direction,
The first optical system holding frame of the plurality of optical system holding frames includes an engaged portion that restricts rotation of at least one other second optical system holding frame,
The second optical system holding frame includes an engaging portion that can be engaged with the engaged portion along an optical axis direction,
In the first state from the retracted state to the imaging state, the end portion on the imaging side of the engaging portion is positioned on the imaging side with respect to the lens group held by the first optical system holding frame, In the second state between the retracted state and the imaging state, the lens unit is positioned on the objective side with respect to the lens group held by the first optical system holding frame.
A lens barrel characterized by that. A third optical system holding frame whose rotation is restricted by the first optical system holding frame, and the third optical system holding frame is an aperture shutter device;
The lens barrel according to claim 1. The second optical system holding frame is a holding frame that holds the second group optical system.
The lens barrel according to claim 1, wherein the lens barrel is provided. The first optical system holding frame is a holding frame that holds a third group optical system.
The lens barrel according to any one of claims 1 to 3, wherein: The first state is a retracted state.
The lens barrel according to any one of claims 1 to 4, wherein: The first state is a TELE state.
The lens barrel according to any one of claims 1 to 4, wherein: The second state is a WIDE state.
The lens barrel according to any one of claims 1 to 6, wherein: The engaged portion is formed from the end on the objective side of the first optical system holding frame to the vicinity of the end on the imaging side.
The lens barrel according to claim 1, wherein the lens barrel is a lens barrel. A part of the engaging portion is located in the vicinity of an image forming side end portion of the first optical system holding frame in the first state, and the first optical system in the second state. Located near the objective end of the holding frame,
The lens barrel according to any one of claims 1 to 8, wherein: An imaging apparatus including an imaging element that photoelectrically converts a subject image,
Comprising the lens barrel according to any one of claims 1 to 9,
An imaging apparatus characterized by that.

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