JPH0728122A - Light measuring device of camera - Google Patents

Abstract

PURPOSE:To provide a low-cost light measuring device for camera embodied in a small size and equipped with a high accuracy, by furnishing a converging lens part on a light transmitting member having a light transmitting function which serves as the exterior member of the camera. CONSTITUTION:A finder structure member 50 holds a light receiving element for light measurement 72 by pressing with a resilient arm 50g. The exterior panel 7 is made from a transparent member and secured to a front cover 3 by means of adhesion, welding, etc. The panel 7 has a lens part 7f inside of the camera in its position corresponding to ahead the optical axis of the light receiving element 72 in a single piece structure. This constitution permits light measuring without provision of any lens for light measurement separately as in the conventional arrangement, which enables omitting the space from the exterior member to the lens for light measurement, and it is possible to secure the image forming distance from the lens for light measurement till the light receiving element directly from the inside surface of the exterior member, so that the resultant camera is embodied in a small size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photometric device for a camera, and more particularly to a photometric device for a camera for photometrically measuring an object.

[0002]

2. Description of the Related Art Conventionally, various photometric devices for cameras for photometrically measuring an object have been proposed.

As an example of such a device, for example, Japanese Utility Model Application Laid-Open No. 58-109725 discloses a photometry of a camera for autofocusing in which a separate optical path is provided in a part of a finder lens to effectively use the space in the camera. The device is described.

Further, Japanese Utility Model Publication No. 1-54029 discloses that
It is described that a split optical path is provided in a finder optical system and a photometric light receiving element is arranged in the split optical path.

Further, as a third conventional example, a transparent and transparent photometric window is separately fixed to the exterior member, and
Independently installing a condenser lens for photometry inside the camera,
There is one in which a light receiving element is arranged at the image forming position of this condenser lens, and this is an example of a structure often seen in a general camera.

[0006]

[Problems to be Solved by the Invention] Japanese Utility Model Laid-Open No. 58-1097
In the one described in Japanese Patent No. 25, the space of the light receiving portion is not reduced because the lens of the finder becomes large.

Further, the one disclosed in Japanese Utility Model Laid-Open No. 1-54029 has a problem that the finder becomes dark or the optical system becomes complicated or large when the optical path of the finder optical system is divided. .

Further, according to the third conventional example, there is a problem that the camera is upsized by the thickness of the photometric window and the space from this window to the condenser lens.

The present invention has been made in view of the above problems, and an object thereof is to provide an inexpensive and highly accurate photometric device for a small camera.

[0010]

In order to achieve the above object, a photometric device for a camera according to the present invention has a translucent member having a translucent function, which is an exterior member of the camera, and a translucent member which transmits the translucent member. It is provided with a light receiving means for receiving light and a condensing lens portion provided in a portion of the light transmitting member facing the light receiving means.

[0011]

The condenser lens portion provided on the translucent member transmits and condenses the light, and the light receiving means receives the transmitted light.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 25 show an embodiment of the present invention. The external appearance of the camera 1 is as shown in FIGS. 1 and 2, and the front side is covered with a front cover 3 and the rear side is covered with a rear cover 4, and the front side of the front cover 3 is substantially centered. The lens barrel 2 has an exterior panel 7, and the rear panel 6 is openable and closable on the rear side.

The front cover 3 is a member that covers the respective components inside the camera from the front side, and a grip portion 3a for gripping the camera 1 is provided on the left side. A strobe window 11 made of a transparent panel in which a stroboscopic light emitting portion is arranged is disposed above the grip portion 3a. A strobe window 11 near the left side of the strobe window 11 is provided on the strobe window 11 at the time of photographing. Projections 3b for preventing the impact
Is provided. Further, a release button 12 for performing a release operation is provided on the left side on the upper surface of the front side cover 3, and by surrounding the periphery of the release button 12 with a finger, the release button 12 is rotated left and right. A zoom dial 13 for zooming is provided.
An LCD window 14 which is a transparent window of a display LCD is provided on the right side of the release button 12, and operation buttons 15, 16, 17 for switching various modes of the camera are further provided on the right side.
Are arranged side by side, and the panorama button 1 for switching between panoramic shooting mode and normal shooting mode
8 are provided.

The lens barrel 2 is a cylindrical frame member that supports a taking lens (not shown). A lens barrier 25, which is opened on the front side of the optical axis of the lens barrel 2 to allow a subject light flux to pass therethrough at the time of shooting, and to shield the shooting lens at the time of carrying,
26 are provided.

The rear cover 4 is an exterior member that covers the rear side of the camera, and a protrusion 4a for covering the viewfinder eyepiece is provided on the upper right side, and on the upper side of the rear cover 4. A power button 21 for switching on / off the power of the camera and operation buttons 22, 23 for switching various modes of the camera are provided.

The back cover 6 is provided at the rear of the camera,
It is a lid member for loading and unloading the film.

The exterior panel 7, which is the translucent member, is fixed to the front cover 3 by adhesion or welding, and is one of the members constituting the appearance of the camera. In this exterior panel 7, a transparent sheet having a transparent member having a light-shielding paint film printed on its surface is integrally injection-molded by, for example, in-mold molding. The exterior panel 7 is provided with a finder entrance window 7b and a photometric window 7a at a position on the upper right side of the lens barrel 2, and these windows 7b and 7a are printed with a light-shielding paint film. It has translucency because it does not exist.
An AF light projecting window 7c is provided between the finder entrance window 7b and the photometric window 7a, and an AF light receiving window 7d is provided at a position slightly above or to the left of the lens frame 2. However, a light-shielding paint having a property of transmitting only infrared light is used for these. AF light receiving window 7
A self-timer LED window 7e is provided in the vicinity of the left side of d, and a light-shielding paint of a type that transmits red light is used in the window 7e for display provided inside the self-timer during operation. The lighting of the LED can be observed from the outside.

Next, FIG. 3 is a perspective view showing the structure of the finder unit. As shown in FIG. 3, inside the camera behind the exterior panel 7 along the optical axis, a finder unit 5 is arranged at a position above the rotary frame 2a which is a component of the lens barrel 2. . In this finder unit 5, various units such as a photometric unit, an AF light emitting unit, an AF light receiving unit, a finder optical system, and a finder zooming drive mechanism are attached to a finder structural member 50 which is a frame member.

The photometric unit is provided behind the photometric window 7a of the exterior panel 7 and is located behind the optical axis, and the photometric hole 50f is formed in the finder structure member 50 at the front center thereof.
And a photometric light-receiving element 72, which is a light-receiving means mounted behind the optical axis.

The AF light-projecting section is the above-mentioned A of the exterior panel 7.
An AF light projecting lens 76, which is provided behind the F light projecting window 7c and is fixed to the finder structure member 50;
AF projection LED (not shown) disposed behind the optical axis
Consists of.

The AF light receiving section is the above-mentioned A of the exterior panel 7.
An AF light receiving lens 77 fixed to the finder structure member 50, which is provided behind the F light receiving window 7d on the optical axis;
An AF light-receiving element (not shown) disposed behind the optical axis.

The finder optical system comprises a finder objective lens group as described below. The fixed objective lens 51 is provided behind the finder entrance window 7d of the exterior panel 7 on the optical axis, and is positioned and fixed to the right end of the finder structure member 50 on the front surface side.

The light flux incident from the fixed objective lens 51 is incident on the first variable magnification lens 52 disposed behind the optical axis thereof. This first variable power lens 52
Is a shaft insertion portion 52 having a cam follower portion 52b on the upper portion.
In addition to having c, a rotation stopping portion 52a is provided so as to project from the lower portion. As a result, the first variable magnification lens 52 is axially supported by the finder objective lens sliding shaft 59, which is a guide shaft, by the shaft insertion portion 52c, and the rotation stopping portion 52a is fitted on the finder lens base plate 60 for fitting. By engaging with the groove 60a, it can slide in the optical axis direction.

The luminous flux from the first variable power lens 52 is
Further, the light is incident on the second variable power lens 53. The second variable power lens 53 has a shaft insertion portion 53c provided with a cam follower portion 53b in the upper portion, and a rotation stopping portion 53a protruding from the lower portion. As a result, the second variable power lens 53 is axially supported by the finder objective lens sliding shaft 59 by the shaft insertion portion 53c, and the rotation stopping portion 53a is fitted in the fitting groove 60a formed in the finder lens base plate 60. When engaged, it can slide in the optical axis direction.

Further, the finder light beam is made to enter an eyepiece variable magnification lens 57 after passing through a first prism 54 and a second prism 56 (see FIG. 4) described later. The eyepiece variable power lens 57 is a lens for increasing the magnification of the viewfinder field during panoramic shooting or trimming shooting, and is configured to be movable as described later.

The optical image that has passed through the eyepiece variable magnification lens 57 is incident on the fixed eyepiece lens 58. The fixed eyepiece lens 58 has a mounting portion 58a protruding from below, and is fixed to the finder structure member 50 by being inserted into a fixed shaft 50f (see FIG. 15) described later.

The cam follower portion 52b of the first variable power lens 52 and the cam follower portion 53 of the second variable power lens 53.
B is provided with urging means attachment portions 52d and 53d, respectively, and by attaching the second urging means 66 to these, the first variable magnification lens 52 and the second variable magnification lens 53 are provided.
Is urged in the pulling direction. As a result, the cam follower portions 52b and 53b are urged in a direction of abutting the cam portions 61a and 61b of the cam member 61, which is a cylindrical member.

A finder zooming drive mechanism for zooming by driving such a finder optical system is constructed as described below. Rotating member 6
3, a gear portion 63a and a drive belt winding portion 63b are coaxially connected to each other, and are rotatably supported by a rotary member shaft 64. The gear portion 63a is formed on the peripheral surface of the rotary frame 2a of the lens barrel 2 and the gear portion 2b is formed.
The rotation of the rotary frame 2a is transmitted to the cam member 61 by meshing with the cam member 61, thereby performing zooming of the finder.

The drive belt 62 is wound around either the rotating member 63 or the cam member 61 to transmit the rotating operation of one to the other.
Both ends are fixed to the driving belt winding portion 63b and the driving belt winding portion 61c of the cam member 61. The driving force of the drive belt 62 is supplied in one direction by the rotational driving of the rotary frame 2 and in the other direction by the biasing force of the first biasing means 65 (see FIG. 4). At this time, the drive belt winding portion 63b
By changing the winding diameter of the drive belt winding portion 61c, the reduction ratio can be set arbitrarily. The position of the driving belt 62 is regulated by the belt position regulating portion 50d of the finder structure member 50.

In this way, the drive belt 62 and the rotary frame 2
a and the AF area surrounded by the viewfinder lens group
By arranging the light projecting portion and the like, it is possible to effectively use the space and realize miniaturization of the camera body.

The cam member 61 is a finder structure member 50.
Is rotatably supported by a cam member shaft portion 50e (see FIG. 4) provided with a spacer that projects forward from the right end portion of the. This cam member 61 is the first member as described above.
The cam follower portion 52b of the variable power lens 52 and the cam portions 61a, 61b with which the cam follower portion 53b of the second variable power lens 53 abuts are formed on the peripheral surface, and the peripheral surface of the front end is One end of the drive belt 62 is a drive belt winding section 61c that is fixed.

Since the rotating member 63 and the cam member 61 are connected by the driving belt 62 as described above, even if the finder optical system is a layout separated from the lens barrel 2, the operation of the lens barrel 2 is performed. It is possible to configure a finder optical system that can be linked to. Further, the rotating member 63 and the cam member 6
Since it is possible to dispose the photometric unit, the AF unit, and the like between the two, the degree of freedom in layout is increased and the units can be efficiently arranged, and as a result, the camera body can be downsized.

FIG. 4 is a perspective view showing the structure of the finder lens group, and FIG. 5 is a perspective view showing a state in which the finder objective lens group and the first prism are assembled. The first prism 54, which is a fixed prism, is for inverting the light beam incident from the finder objective lens group in a U-shape in the lateral direction by about 180 °, and is attached to the finder structural member 50.

The visual field mask 55 is a member showing a visual field frame having a normal screen size, is located on the image forming plane of the finder optical system, and is sandwiched by the first prism 54 and the second prism 56. The position has been fixed.

The second prism 56 is the first prism 5 described above.
The light flux incident from No. 4 is inverted by approximately 180 ° in a vertical direction in a U shape, and the position is fixed by the finder structure member 50 and the first prism 54.

Finder lens base plate 6 as a rotation restricting member
Reference numeral 0 denotes a plate-shaped member in which a fitting groove 60a parallel to the optical axis direction is engraved, and the fixed objective lens 51 and the first prism 54 hold one end of each and determine the position. As described above, the rotation stop portion 52a of the first variable power lens 52 and the rotation stop portion 53a of the second variable power lens 53 are engaged with the fitting groove 60a, and the finder objective lens sliding shaft 59 of both of them is engaged. The rotation around is restricted.

The first biasing means 65 has fixed arms 65 at both ends.
The movable arm 6 is a biasing member including a coil spring and a movable arm 65b. The fixed arm 65a is fixed to the cam member shaft portion 50e of the finder structure member 50.
5b is fixed to the cam member 61. The first urging means 65 constantly urges the cam member 61 in the rotational direction indicated by the arrow F to drive the cam member 61 and prevent the drive belt 62 from slacking even in the stopped state. ing.

FIG. 6 is a plan view showing the objective lens group and the cam member in the tele (telephoto) state, and FIG. 7 is a plan view showing the objective lens group and the cam member in the wide (wide angle) state.

As shown in the figure, the end surface of the cam follower portion 52b of the first variable power lens 52 on the rear side of the optical axis is formed by the cam member 6.
The second variable power lens 5 is in contact with the first cam portion 61a.
The end surface of the third cam follower portion 53b on the optical axis front side is in contact with the cam portion 61b.

The rotating member 63 is rotated by the rotation of the rotating frame 2a.
When the cam member 61 rotates via the driving belt 62 and the driving belt 62, the first variable magnification lens 5 moves along the cam portions 61a and 61b.
The second variable power lens 53 and the second variable power lens 53 move in the optical axis direction.
At this time, the cam portions 61a and 61b and the cam follower portion 52
finder objective lens sliding shaft 5 by the engagement of b and 53b
The finder lens base plate 60 prevents the first variable magnification lens 52 and the second variable magnification lens 53 from rotating around 9
The rotation stoppers 52a and 53a are engaged with the fitting groove 60a to regulate the rotation.

8 to 14 are cross-sectional views showing first to seventh examples of a configuration for improving the positional accuracy of the finder optical system having the zoom function. When applied to a camera, the most appropriate one of the configurations shown above may be selected as necessary in consideration of ensuring the performance of the lens and assembling.

As shown in the first example in FIG. 8, the finder objective lens sliding shaft 59 has a fixed objective lens 51 on the front side of the optical axis and a finder structure member 50 on the rear side of the optical axis at both ends thereof.
It is supported by. The finder lens base plate 60 is
The fixed objective lens 51 and the first prism 54 hold the respective one ends to determine the positions. Objective lens 5
The first and first prisms 54 are positioned and fixed to the finder structure member 50, respectively. As a result, the viewfinder objective lens sliding shaft 5 with respect to the fixed objective lens 51
9 and the positioning accuracy of the fitting groove 60a of the finder lens base plate 60 and the positioning accuracy of the fitting groove 60a of the finder lens base plate 60 with respect to the first prism 54 are improved. The precision of the relative position of the variable power lens 52 and the second variable power lens 53 is improved.

In order to reduce the size of the finder optical system for zooming, the relative positional accuracy of each lens is strictly required, but according to the configuration shown in FIG. 8, the fixed objective lens 51 and the first prism are used. Since the accuracy of the relative positions of the first variable power lens 52 and the second variable power lens 53 with respect to 54 can be improved, the finder optical system can be downsized, and as a result, the camera can be downsized. . In addition, since the finder optical system has high accuracy, the optical axis does not shift, and adverse effects such as aberrations are reduced, so that the finder has good visibility.

9 to 14 show other examples of the configuration shown in FIG. As shown in the second example in FIG. 9, the finder objective lens sliding shaft 59 is supported at its both ends by a fixed objective lens 51 on the front side of the optical axis and a finder structural member 50 on the rear side of the optical axis. The finder lens base plate 60 is positioned by holding one end thereof by the fixed objective lens 51 and the finder structure member 50. The fixed objective lens 51 and the first prism 54 are positioned and fixed to the finder structure member 50, respectively. As a result, the fixed objective lens 51
Finder objective lens sliding shaft 59 and fitting groove 6 for
Since the positional accuracy of 0a is improved, the relative position accuracy of the first variable lens 52 and the second variable lens 53 with respect to the fixed objective lens 51 is improved. Other parts are shown in FIG.
Is almost the same as that shown in.

As shown in a third example in FIG. 10, the finder objective lens sliding shaft 59 is supported at both ends by a fixed objective lens 51 on the front side of the optical axis and a first prism 54 on the rear side of the optical axis. There is. The finder lens base plate 60 is positioned by holding one end thereof by the fixed objective lens 51 and the finder structure member 50. The fixed objective lens 51 and the first prism 54 are positioned and fixed to the finder structure member 50, respectively. As a result, the positional accuracy of the finder objective lens sliding shaft 59 and the fitting groove 60a relative to the fixed objective lens 51, the first prism 5
Since the positional accuracy of the finder objective lens sliding shaft 59 with respect to 4 is improved, the fixed objective lens 51 and the first prism 5
4 for the first variable magnification lens 52 and the second variable magnification lens 5
The accuracy of the relative position of 3 is improved. Other parts are almost the same as those shown in FIG.

As shown in a fourth example in FIG. 11, the finder objective lens sliding shaft 59 has both end portions of the finder structure member 50 on the front side of the optical axis and the first prism 54 on the rear side of the optical axis.
It is supported by. The finder lens base plate 60 is
The finder structure member 50 and the first prism 54 hold the respective one ends to determine the positions. The fixed objective lens 51 and the first prism 54 are positioned and fixed to the finder structure member 50, respectively. This improves the positional accuracy of the finder objective lens sliding shaft 59 and the fitting groove 60a with respect to the first prism 54, so that the relative distance between the first variable power lens 52 and the second variable power lens 53 with respect to the first prism 54. The position accuracy is improved. Other parts are almost the same as those shown in FIG.

As shown in the fifth example in FIG. 12, the finder objective lens sliding shaft 59 has its both ends supported by a fixed objective lens 51 on the front side of the optical axis and a first prism 54 on the rear side of the optical axis. There is. The finder lens base plate 60 is positioned by holding one end of each by the fixed objective lens 51 and the first prism 54. Fixed objective lens 5
The first and first prisms 54 are positioned and fixed to the finder structure member 50, respectively. As a result, the viewfinder objective lens sliding shaft 5 with respect to the fixed objective lens 51
9 and the position accuracy of the fitting groove 60a, and the first prism 5
Since the positional accuracy of the finder objective lens sliding shaft 59 and the fitting groove 60a with respect to 4 is improved, the fixed objective lens 51
The accuracy of the relative position of the first variable magnification lens 52 and the second variable magnification lens 53 with respect to the first prism 54 is improved. Other parts are almost the same as those shown in FIG.

As shown in a sixth example in FIG. 13, the finder objective lens sliding shaft 59 is supported at both ends by a fixed objective lens 51 on the front side of the optical axis and a first prism 54 on the rear side of the optical axis. There is. The finder lens base plate 60 is positioned with its one end held by the finder structure member 50 and the first prism 54. The fixed objective lens 51 and the first prism 54 are positioned and fixed to the finder structure member 50, respectively. This improves the positional accuracy of the finder objective lens sliding shaft 59 with respect to the fixed objective lens 51 and the positional accuracy of the finder objective lens sliding shaft 59 and the fitting groove 60a with respect to the first prism 54. The relative position accuracy of the first variable power lens 52 and the second variable power lens 53 with respect to the one prism 54 is improved. The other parts are
It is almost the same as that shown in FIG.

As shown in the seventh example in FIG. 14, the finder objective lens sliding shaft 59 has both end portions of the finder structure member 50 on the front side of the optical axis and the first prism 54 on the rear side of the optical axis.
It is supported by. The finder lens base plate 60 is
The fixed objective lens 51 and the first prism 54 hold the respective one ends to determine the positions. The fixed objective lens 51 and the first prism 54 are positioned and fixed to the finder structure member 50, respectively. This improves the positional accuracy of the fitting groove 60a with respect to the fixed objective lens 51, and the positional accuracy of the finder objective lens sliding shaft 59 and the fitting groove 60a with respect to the first prism 54, and thus the fixed objective lens 51 and the first prism 54. The relative position accuracy of the first variable power lens 52 and the second variable power lens 53 with respect to is improved. Other parts are almost the same as those shown in FIG.

FIG. 15 is a perspective view of the camera as viewed from the rear side, showing the configuration of the panorama switching of the finder section. The fixed eyepiece lens 58 is used for the fixed shaft 5 of the finder structure member 50.
It is positioned at 0f and fixed to the finder structure member 50 so that the subject image formed on the incident surface of the second prism 56 can be observed. At this time, in the state as shown in the figure, the finder can be observed with a normal screen size and magnification.

Both ends of the panorama switching shaft 68 are fixed to the finder structure member 50 in a direction orthogonal to the finder optical axis.

The eyepiece variable magnification lens frame 67 is a member that holds the eyepiece variable magnification lens 57 and has an elongated substantially U-shaped viewfinder panoramic field mask 67a integrally fixed thereto. , The panorama switching shaft 68
It is held slidably on. The eyepiece variable magnification lens frame 67
Is engaged with a groove 50c formed in parallel with the panorama switching shaft 68 of the finder structure member 50 by engaging a rotation stopping portion 67b projecting from one end surface thereof, so that Rotation is restricted.

The eyepiece variable magnification lens frame 67 is inserted in front of the fixed eyepiece lens 58 of the finder by the urging force of the panorama switching spring 69 which is inserted into the panorama switching shaft 68 between the viewfinder structural member 50 and compressed. It is designed to be inserted into. In the inserted state, the screen is switched to the panoramic size and the viewfinder magnification is increased, so that the viewfinder can be easily seen.

The eyepiece variable magnification lens 57 is the eyepiece lens 5.
8 is a lens whose viewfinder magnification is increased by being inserted in front of the lens 8, and is configured to be slidable in the moving direction of the eyepiece variable magnification lens frame 67 in the eyepiece variable magnification lens frame 67. A spring 70 biases the spring 70 to the left. The lens urging spring 70 is used in the eyepiece variable magnification lens frame 67.
It is inserted into a pin projecting from and is configured so as not to buckle.

16 and 17 are views showing the panoramic switching operation of the finder, and FIG. 16 is a plan sectional view when the finder is in the panoramic state. Eyepiece variable magnification lens 5
7, the projecting abutting portion 57a abuts the projection 50b of the finder structure member 50 by the urging force of the lens urging spring 70 so that the position can be accurately determined. As a result, the optical axis of the eyepiece variable power lens 57 is accurately aligned with the optical axis of the finder optical system. Further, the eyepiece variable power lens 57 is provided with two projections 57b protruding from the lower surface, and these projections 57b are elongated in the direction perpendicular to the finder optical axis formed in the eyepiece variable power lens frame 67. Slot 67c
By engaging with each, the position in the direction of the optical axis is regulated and it is slidable in the direction along the elongated hole 67c.

The eyepiece variable magnification lens frame 67 is biased in the insertion direction of the eyepiece variable magnification lens 57 by the panoramic switching spring 69 as described above, but the spring force of the lens biasing spring 70 causes the panoramic switching spring 69 to move. Since the spring force is set to be stronger, the eyepiece variable magnification lens frame 67 is not pushed back by the spring force of the lens biasing spring 70. As a result, the eyepiece variable magnification lens frame 67 becomes the eyepiece variable magnification lens 5
The insertion position can be determined independently of 7.

On the other hand, the finder panoramic field mask 6
7a does not require particularly precise positioning even when it is inserted from the lateral direction orthogonal to the finder optical axis as described above, and may be inserted at the position indicated by reference numeral 67a 'in FIG. This is because the mask on the short side of the field mask 55 is also used as a mask for controlling the field of view in the short side during panorama.
This is because the viewfinder panoramic field-of-view mask 67a provided in a U-shape masks the long side and restricts only the field along the long side.

FIG. 17 is a plan sectional view when the finder is in a normal screen state. From the panoramic shooting state shown in FIG. 16 above, a panorama switching gear 71 (see FIG.
(See 0), the eyepiece variable magnification lens frame 67 is returned to the state shown in the drawing against the biasing force of the panorama switching spring 69.
The viewfinder panoramic field mask 67a also returns to return the field of view to the normal screen size, and the eyepiece variable magnification lens 57
Return to normal viewfinder magnification.

FIG. 18 is a vertical sectional view when the finder is in the panoramic state. The viewfinder panoramic field mask 67a is arranged near the rear side of the normal screen size field mask 55 arranged on the image plane of the finder optical system and near the front side of the first prism 54, as shown in the figure. That is, it is inserted in the vicinity of the image plane of the finder objective lens.

As described above, the eyepiece variable power lens 57 is inserted between the fixed eyepiece lens 58 and the second prism 56, and the protruding projection 57b is engaged with the elongated hole 67c of the eyepiece variable power lens frame 67. By matching, the position in the optical axis direction of the finder is regulated, and the eyepiece variable magnification lens 57 is free to move in the moving direction.

FIG. 19 is a view showing the eyepiece variable magnification lens frame 67 shown in FIG. 17 as seen from the direction of arrow J and the view field mask portion of the finder in cross section. As described above, the field mask 55 for the normal screen is arranged in the vicinity of the incident surface of the second prism 56 facing the first prism 54, and this position is the image forming surface of the finder optical system.

Viewfinder panoramic mask 67a
Is located at the position shown in FIG. 19 in the normal screen, but moves to the position indicated by reference numeral 67a 'in the figure in the panorama so as to cover up and down the field mask 55 on the normal screen. There is.

As described above, according to the configuration described with reference to FIGS. 15 to 21, the eyepiece variable magnification lens 57 can be accurately positioned independently of the insertion position of the viewfinder panoramic field mask 67a. With
The viewfinder panoramic field mask 67a can bring the viewfinder into a panoramic state without requiring particularly precise positioning.

By doing so, the finder observation magnification can be increased during panoramic screen size photographing as compared with standard screen size photographing, which makes it easier to observe the finder image and provides a realistic sensation that is similar to enlargement during printing. Can be given.

Further, at the time of panorama, since the area outside the photographing screen is shaded on the viewfinder, it is possible to reliably prevent the subject from being photographed by the shading mask on the screen.
In addition, the finder unit can be downsized and the camera can be downsized as well because the viewfinder can be magnified and the field mask can be switched with the simple configuration.

20 and 21 are diagrams showing a normal state and a panoramic state of the photographing screen and the viewfinder field mask portion. As shown in FIG. 20, the camera 1 has a camera body 8 having a rectangular photographing screen opening 8c in the substantially central portion, a spool chamber 8b on the right side and a cartridge chamber 8a on the left side.
Is equipped with.

This camera body 8 has an upper light-shielding mask 81.
And panorama switching mechanism 85 having a lower light-shielding mask 82
(All are not shown) are held, and the upper light shielding mask 81 and the lower light shielding mask 82 are moved up and down to regulate the photographing light flux passing through the photographing screen opening 8c as necessary, so The screen size and panorama screen size can be switched. The upper light-shielding mask 81
The lower light-shielding mask 82 and the lower light-shielding mask 82 are vertically guided by a shaft 83 and are connected to each other by a biasing means 84.

The camera body 8 further holds the finder structure member 50 of the finder unit 5, and
A panorama switching gear 71, which is a two-stage gear that transmits the movement of the mask on the photographing screen to the eyepiece variable magnification lens frame 67, is rotatably held.

The finder structure member 50 of the finder unit 5 holds the above-mentioned eyepiece variable power lens 57 and also holds the eyepiece variable power lens frame 67 integrally fixed to the viewfinder panoramic field mask 67a. .
Further, the eyepiece variable magnification lens frame 67 has a rack 67d which is a second rack, and meshes with the large diameter gear 71a of the panorama switching gear 71.

In the upper light-shielding mask 81, a rack 81c, which is a first rack meshing with the small-diameter gear 71b of the panorama switching gear 71, is integrally formed in the upper space between the spool chamber 8b and the photographing screen opening 8c. The panorama switching gear 71 is fixed and is rotated by the vertical movement of the upper light-shielding mask 81. Upper shading mask 8
Although not shown in detail, the vertical movement of 1 is operated by the panorama switching mechanism 85.

When the photographing screen is switched from the normal state as shown in FIG. 20 to the panoramic state as shown in FIG. 21, the rack 81c is moved downward and the rack 81 is moved.
The small diameter gear 71b of the panorama switching gear 71 meshing with c is rotated. Along with this, the large diameter gear 71a of the panorama switching gear 71 also rotates integrally,
The eyepiece variable magnification lens frame 67 meshing with the large-diameter gear 71a and the rack 67d moves in a direction (right direction in the drawing) orthogonal to the moving direction of the upper light-shielding mask 81.

When the eyepiece variable magnification lens frame 67 is in the panoramic state as described above, the viewfinder panoramic field mask 6 is formed.
7a is inserted in front of the finder field mask 55 in the normal state, and even when looking through the finder, the upper and lower screen ranges can be observed in a state of being shielded from light.

When returning from the panoramic state as shown in FIG. 21 to the normal state as shown in FIG. 20, the rack 81 is moved by moving the upper light-shielding mask 81 upward.
c moves upward, and the small diameter gear 71b of the panorama switching gear 71 meshing with the rack 81c is rotated counterclockwise in the figure. Along with this, the panorama switching gear 7
The large-diameter gear 71a of No. 1 also rotates integrally, and the eyepiece variable magnification lens frame 67 meshing with the large-diameter gear 71a by the rack 67d moves to the left in the drawing and returns to the state shown in FIG. .

According to such a configuration as described with reference to FIGS. 20 and 21, since the photographing screen size and the viewfinder mask of the finder can be switched at the same time, not only can the photograph be taken without missing a photo opportunity. , Since the size of the shooting screen and the viewfinder screen are always the same, there is no chance of wrong shooting or shooting in which the subject is eclipsed by the light-shielding mask of the shooting screen.

Further, as described above, the rack 81c is arranged in the upper space between the spool chamber 8b of the camera body 8 and the photographing screen opening 8c, and the rack 67 is arranged above the photographing screen opening 8c.
d is provided, these are connected by the panorama switching gear 71, and the upper light shield mask 81 is moved up and down to move the viewfinder panoramic field mask 67a to the upper light shield mask 8a.
With the configuration in which it is moved in the direction orthogonal to the operation direction of 1, the arrangement inside the camera can be performed efficiently, and a small camera can be obtained.

In the above structure, instead of disposing the rack 81c on the spool chamber 8b side, the cartridge chamber 8
The rack 81c may be disposed in the upper space between the a and the photographing screen opening 8c, and the other portions may be configured in substantially the same manner.

22A and 22B are views respectively showing a normal screen when the finder is observed and a panoramic screen. A normal screen as shown in FIG. 22 (A) shows a range in which the inside of the visual field mask 55 is almost exposed to the film and photographed.

As described above, the incident side end surface of the second prism 56 serves as an image forming surface of the finder optical system, and various targets (for example, various display means etc.) should be arranged therein. So you can observe it at the time of shooting. Parallax correction marks 56a and 56b at the time of close-up photography are engraved on the incident surface of the second prism 56, so that they can be observed together with the subject image.

Parallax correction mark 56a for normal screen
Indicates the parallax correction position on the normal screen, and the subject inside the line indicated by the parallax correction mark 56a for the normal screen indicates the range that can be photographed without fail at the short distance photographing. The parallax correction mark 56a for the normal screen has a thickness that is easy to see on the normal screen.

On the other hand, the parallax correction mark 56b for the panoramic screen is provided at the parallax correction position at the time of panorama, and since it is a display that has no meaning in the state of the normal screen, the parallax correction mark 56b for the normal screen is displayed. The line width is engraved so that it does not interfere with the field of view.

The panoramic screen as shown in FIG. 22B is observed when the viewfinder panoramic visual field mask 67a integrally fixed to the eyepiece variable magnification lens frame 67 is inserted into the viewfinder optical path. As shown in the figure, the upper and lower parts of the screen are shaded so that the screen looks long horizontally.

At this time, the eyepiece variable magnification lens 57 held by the eyepiece variable magnification lens frame 67 is also inserted into the finder optical path at the same time, and the observation magnification of the finder is increased. This is to provide a powerful viewfinder by enlarging the small photographic screen for easy viewing. At the same time, the above-mentioned panoramic screen parallax correction mark 56b is also enlarged and viewed.

The enlarged parallax correction mark 56b for the panoramic screen is substantially the same thickness as the parallax correction mark 56a for the normal screen, which can be observed in the normal screen size, and is easily observed. Is configured to. Then, the parallax correction mark 56a for normal screen is hidden outside the range of the field of view during the panorama and becomes invisible.

In the above description, the parallax correction mark 5
Although 6a and 56b are engraved on the incident surface of the second prism 56, it goes without saying that they may be drawn by sputtering or printed. Further, depending on the optical system of the finder, it may be drawn on a surface that can be observed by the photographer, such as the lens surface of the finder or the exit surface of the prism of the finder.

Another example of the parallax correction mark as described above is shown in FIGS. 23A and 23B, which shows a normal screen when the finder is observed. It is the figure which each showed the screen at the time of performing trimming. The normal screen as shown in FIG. 23 (A) is a viewfinder screen similar to that shown in FIG. 22 (A), and the parallax correction mark 56c at the time of trimming is displayed.
Is a thin line and is short so that it does not get in the way when observing on a normal screen.

The screen at the time of trimming as shown in FIG. 23 (B) differs from the screen shown in FIG. 22 (B) above.
The field of view mask is smaller not only in the top and bottom but also in the left and right along with the shooting screen, and it is about to resemble a normal screen.

However, if it is left as it is, the screen size becomes small and it is difficult to see. Therefore, as in the above, the eyepiece variable magnification lens 57 is used.
Is used to increase the finder observation magnification so that the finder can be viewed in the same size as the visual field mask 55 that can be seen at the normal finder magnification.

At this time, the parallax correction mark 56c at the time of trimming can be seen with the same thickness and length as in the normal screen, as described above. Also,
The parallax correction mark 56a for the normal screen is hidden outside the range of the visual field during the trimming and is not observed.

According to the configurations shown in FIGS. 22 and 23, the thickness, length, and size can be displayed so as not to disturb the normal screen, and are easy to see during panorama or trimming. It is possible to provide a viewfinder optical system having a parallax correction mark for a short distance that can be observed at a distance.

In the above description, the parallax correction mark is drawn or marked on the lens or prism.
As a means for displaying the parallax correction mark, a transmissive liquid crystal may be arranged on the image forming plane of the finder to change the thickness or length of the line of the parallax correction mark. Further, the color of the display of the correction mark may be changed to facilitate recognition. Further, in the case of liquid crystal display, the size and thickness of the AF target mark or the like normally displayed at the center of the normal screen may be changed according to panorama or trimming.

24 and 25 are views showing the structure of the photometric optical system. In FIG. 24, the finder structure member 50
As shown in FIG. 3 above, the photometric light receiving element 72 is pressed and held by the elastic arm 50g. A photometric infrared light cut filter 73 is disposed on the optical axis front side of the photometric light receiving element 72, and the photometric light receiving element 72 is configured to measure a light beam close to visible light.

A photometric aperture 50f for allowing light to enter is provided on the optical axis front side of the photometric light receiving element 72, and the photometric aperture 50f allows the photometric aperture from a side unnecessary for photometric measurement of an object. Light is not allowed to enter. The finder structure member 50 is fixed to the camera body 8 as shown in FIG.

The exterior panel 7 is formed of a transparent member as described above, and is fixed to the front cover 3 by adhesion or adhesion. The exterior panel 7 integrally has a lens portion 7f inside the camera at a portion corresponding to the front side of the optical axis of the photometric light receiving element 72.

On the outside of the camera of the exterior panel 7, a transparent sheet 7i having a light-shielding paint film 7g printed, for example, on the side in contact with the exterior panel 7 is integrally fixed by in-mold molding. The paint film 7g is not provided in the portion corresponding to the lens effective portion of the lens portion 7f, and the transparent member inside is directly in contact with the transparent sheet 7i, and the light for photometry is incident without being blocked. It is a window 7a for photometry that can be performed.

Similarly, the front cover 3 is also provided with an opening 3c at a portion corresponding to the lens effective portion, and the F-number of the lens is determined by using this opening 3c as a diaphragm of the lens portion 7f. It has become.

As described above, by integrally providing the lens for photometry on the exterior panel 7, the light flux from the subject is condensed and photometry can be performed.

Next, another example of the structure shown in FIG. 24 is shown in FIG. As shown, a light-shielding print 7h is provided on the outer side of the exterior panel 7. Regarding the effective portion of the lens 7f, this light-shielding printing 7h is not performed,
The opening of the transparent member is exposed to form the photometric window 7a.
The other parts are almost the same as those in FIG.

With the configuration shown in FIGS. 24 and 25, photometry can be performed without separately providing a conventional photometric lens, and as a result, from the exterior member to the photometric lens. Since the space can be omitted and the imaging distance from the photometric lens to the light receiving element can be secured directly from the inner surface of the exterior member, the camera can be downsized.

Further, since the lens surface is provided inside the exterior member, the lens surface is less likely to be scratched. Further, since the light-shielding film is provided except for the vicinity of the lens portion, light unnecessary for photometry can be cut and accurate photometry can be performed. Further, since the photometric lens is formed integrally with the exterior member, it has an advantage that the waterproof performance and the dustproof performance are high as compared with the case where it is configured as a separate part like a conventional camera.

As another example of the configuration shown in FIGS. 24 and 25, the photometric light receiving element 72 attached to the finder structure member 50 may be directly attached to the exterior panel 7 or the front cover 3. This is possible, and by doing so, it becomes easy to assemble the photometric light-receiving element 72 with respect to the optical axis of the lens at an accurate mounting position.

Further, as another example of the structure shown in FIGS. 24 and 25, infrared light is cut off on the surface of the photometric window 7a of the exterior panel 7 to transmit almost only visible light. By providing the characteristic coating film by in-mold molding or printing, the photometric infrared light cut filter 73 becomes unnecessary, and the camera can be further downsized and reduced in cost. Further, the lens portion may be configured by using a Fresnel lens. In this case,
Further, the camera can be downsized.

As described above, according to the embodiments of the present invention, photometry can be performed without separately providing a photometric lens as in the conventional case, and as a result, a space from the exterior member to the photometric lens can be saved. Since it can be omitted and the image forming distance from the photometric lens to the light receiving element can be secured directly from the inner surface of the exterior member, the camera can be significantly downsized.

Further, as compared with a camera which is miniaturized by directly measuring the light incident from the transparent window of the exterior member without providing the photometric lens, the photometric lens is provided integrally with the exterior member to form a subject image. By performing photometry with the image formed on the light receiving element, it is possible to perform highly accurate photometry and multi-divided photometry by dividing the light receiving element, and as a result, appropriate exposure for the brightness distribution of the subject is obtained. The camera can be controlled.

Further, since the photometric lens is formed as an integral part with the exterior member, it is more waterproof and dustproof than the conventional camera in which the exterior member and the photometric window are provided as separate parts. It can be an excellent small camera.

In addition, since the photometric lens surface is provided inside the exterior member, the lens surface is unlikely to be scratched. Since a light-shielding film is provided around the photometric lens portion, light unnecessary for photometry can be cut and accurate photometry can be performed. Since it has a simple structure and a small number of parts, it can be an inexpensive camera.

[0106]

As described above, according to the present invention, it is possible to provide an inexpensive and highly accurate photometric device for a small camera.

[Brief description of drawings]

FIG. 1 is a plan view of a camera showing an embodiment of the present invention.

FIG. 2 is a front view of the camera of the above embodiment.

FIG. 3 is an exploded perspective view of a finder unit, an exterior panel, and a rotary frame of the above embodiment.

FIG. 4 is an exploded perspective view showing a configuration of a finder optical system in the finder unit of the above embodiment.

FIG. 5 is an exploded perspective view showing a state in which the finder optical system of the above embodiment is partially assembled.

FIG. 6 is a diagram illustrating a first cam member and a first cam member in a telephoto state according to the above embodiment.
FIG. 6 is a plan view showing the engaged state of the variable power lens and the second variable power lens of FIG.

FIG. 7 is a diagram showing the cam member and the first embodiment in the wide-angle state of the above embodiment.
FIG. 6 is a plan view showing the engaged state of the variable power lens and the second variable power lens of FIG.

FIG. 8 is a sectional view showing a first example of a configuration for improving the positional accuracy of the finder optical system having the zoom function of the above-described embodiment.

FIG. 9 is a sectional view showing a second example of a configuration for improving the positional accuracy of the finder optical system having the zoom function of the above-described embodiment.

FIG. 10 is a cross-sectional view showing a third example of the configuration for improving the positional accuracy of the finder optical system having the zoom function of the above embodiment.

FIG. 11 is a sectional view showing a fourth example of the configuration for improving the positional accuracy of the finder optical system having the zoom function of the above-described embodiment.

FIG. 12 is a sectional view showing a fifth example of a configuration for improving the positional accuracy of the finder optical system having the zoom function of the above-described embodiment.

FIG. 13 is a sectional view showing a sixth example of the configuration for improving the positional accuracy of the finder optical system having the zoom function of the above-described embodiment.

FIG. 14 is a sectional view showing a seventh example of the configuration for improving the positional accuracy of the finder optical system having the zoom function of the above-described embodiment.

FIG. 15 is a perspective view of the configuration related to panorama switching in the finder unit according to the above-described embodiment, as viewed from the rear side of the camera.

FIG. 16 is a plan sectional view showing a case where the finder is in a panoramic state in the configuration related to the panorama switching of the finder unit of the above embodiment.

FIG. 17 is a plan sectional view showing a case where the finder is in a normal screen state in the configuration related to the panorama switching of the finder unit of the above embodiment.

FIG. 18 is a vertical cross-sectional view showing a case where the finder is in a panoramic state in the configuration related to the panorama switching of the finder unit of the above embodiment.

19 is a view showing the eyepiece variable magnification lens frame shown in FIG. 17 as viewed in the direction of arrow J, and showing the field mask portion of the finder in cross section.

FIG. 20 is a front view of the camera body in a normal state showing the interlocking operation of the panoramic mechanism that regulates the shooting screen aperture and the eyepiece variable magnification lens of the finder unit in the above-described embodiment.

FIG. 21 is a partial front view of the camera body in a panoramic state, showing how the panorama mechanism that regulates the aperture of the photographing screen and the eyepiece variable magnification lens of the finder unit according to the above-described embodiment are interlocked.

FIG. 22 is a view of observing the viewfinder of the above-mentioned embodiment.
The diagram which showed the parallax correction mark in the screen at the time of (A) normal, and the screen at the time of (B) panorama.

FIG. 23 is a view of observing the viewfinder of the above-mentioned embodiment.
The line diagram which showed the other example of the parallax correction mark in the screen at the time of (A) normal, and the screen at the time of (B) trimming.

FIG. 24 is a cross-sectional view showing the configuration of a photometric optical system of the camera of the above embodiment.

FIG. 25 is a cross-sectional view showing another example of the configuration of the photometric optical system of the camera of the above embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera 7 ... Exterior panel 7a ... Photometric window 7f ... Lens part 7g ... Light-shielding paint film 7h ... Light-shielding printing 7i ... Transparent sheet 50f ... Photometric aperture 72 ... Photometric light-receiving element 73 ... Photometric infrared Light cut filter

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[Procedure amendment]

[Submission date] February 23, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

The exterior panel 7, which is the translucent member, is fixed to the front cover 3 by adhesion or welding, and is one of the members constituting the appearance of the camera. The exterior panel 7 has a light-shielding paint film integrally formed on the surface of a transparent member by injection molding , for example. The exterior panel 7 is provided with a finder entrance window 7b and a photometric window 7a at a position on the upper right side of the lens barrel 2, and these windows 7b and 7a are covered with a light-shielding coating film. It has translucency because it does not. Further, at a position between the finder entrance window 7b and the photometric window 7a, A
AF light-receiving windows 7d are provided at positions slightly above and to the left of the lens barrel 2 and are provided with AF light-receiving windows 7d, and a light-shielding paint having a property of transmitting only infrared light is used. Has been. In the vicinity of the left side of the AF light receiving window 7d,
A self-timer LED window 7e is provided, and a light-shielding paint that transmits red light is used here, and it is possible to observe from outside the lighting of the display LED provided inside the self-timer during operation. You can do it.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

The finder optical system comprises a finder objective lens group as described below. The fixed objective lens 51 is provided on the rear side of the finder entrance window 7b of the exterior panel 7 along the optical axis, and is positioned and fixed to the right end of the finder structure member 50 on the front side.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction content]

FIG. 15 is a perspective view of the camera as viewed from the rear side, showing the configuration of the panorama switching of the finder section. The fixed eyepiece lens 58 is used for the fixed shaft 5 of the finder structure member 50.
It is positioned at 0f and fixed to the finder structure member 50 so that the subject image formed near the incident surface of the second prism 56 can be observed. At this time, in the state as shown in the figure, the finder can be observed with a normal screen size and magnification.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0054

[Correction method] Change

[Correction content]

The eyepiece variable magnification lens 57 is the eyepiece lens 5.
8 is a lens whose viewfinder magnification is increased by being inserted in front of the lens 8, and is configured to be slidable in the moving direction of the eyepiece variable magnification lens frame 67 in the eyepiece variable magnification lens frame 67. A spring 70 biases the spring 70 to the left. The lens urging spring 70 is used in the eyepiece variable magnification lens frame 67.
It is inserted into a pin 67e that is provided so as to project from, and is configured so as not to buckle.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0093

[Correction method] Change

[Correction content]

The exterior panel 7 is formed of the transparent member as described above, and is fixed to the front cover 3 by adhesion or welding . The exterior panel 7 integrally has a lens portion 7f inside the camera at a portion corresponding to the front side of the optical axis of the photometric light receiving element 72.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0094

[Correction method] Change

[Correction content]

A light-shielding paint film 7g is integrally fixed to the outside of the exterior panel 7 by the in-mold molding . The paint film 7g is not provided in a portion corresponding to the lens effective portion of the lens portion 7f, and the transparent portion inside is not provided.
The member is directly exposed to the outside and serves as a photometric window 7a through which the photometric light can enter without being blocked.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0095

[Correction method] Change

[Correction content]

Similarly, the front cover 3 is also provided with an opening 3c at a portion corresponding to the lens effective portion, and the opening 3c is used as an aperture of the lens portion 7f to determine the aperture diameter of the lens. It has become.

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Correction target item name] Figure 15

[Correction method] Change

[Correction content]

FIG. 15

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 16

[Correction method] Change

[Correction content]

FIG. 16

[Procedure Amendment 11]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 17

[Correction method] Change

[Correction content]

FIG. 17

[Procedure Amendment 12]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 24

[Correction method] Change

[Correction content]

FIG. 24

Claims (1)

[Claims] 1. A light-transmitting member having a light-transmitting function, which is an exterior member of a camera, a light-receiving unit for receiving light transmitted through the light-transmitting member, and a portion of the light-transmitting member facing the light-receiving unit. A photometric device for a camera, comprising: a condenser lens unit provided.