JPH10186205A - Camera with zooming function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify an interlocking mechanism and to make the whole shape of a camera compact by integrally forming the supporting part of a two-group lens moved for a finder variable power action with a coupling part having a follower part abutting on the cam surface of a rotary lens barrel. SOLUTION: The two-group lens 52 is supported by the holder (supporting part) 57 so that it can be moved in an optical axis direction. When the lens 52 is moved, the variable power operation is executed. The coupling lever (coupling part) 23 having the follower 23a abutting on the cam for driving a finder (cam surface) 24a formed at the outside circumferential part of the rotary lens barrel 21 is integrally coupled to the holder 57. Then, they are coupled by engaging the projection parts 58 and 59 of the holder 57 in the hole of the lever 23. The cam 24a is used for regulating the movement of the lens 52 and the lens 52 is moved between a position shown by a continuous line and a position shown by a two-dotted chain line when the lens barrel 21 is rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera with a zoom function having a finder for performing a zooming operation in conjunction with zooming of a photographing lens.

[0002]

2. Description of the Related Art Conventionally, when a small and inexpensive camera is provided with a finder for performing a zooming operation in conjunction with zooming of a photographing lens, the finder is interlocked with zooming of a rotary lens barrel having a photographing lens. Some use a mechanism consisting of a cam and a follower to move the lens inside.

[0003]

However, the mechanism for connecting the conventional rotary lens barrel and the lens of the finder as described above has a complicated structure, and it is not easy to make it compact. Further, there is a problem that light is reflected on a wall surface in the finder or on an end surface of the lens. The present invention has been made in order to solve the above-described problems, and in a case where a camera is provided with a finder that performs a zooming operation in conjunction with zooming of a photographing lens, a zoom operation of a rotating barrel of the photographing lens is performed. It is an object of the present invention to provide a camera with a zoom function that can have a simple structure including a cam and a follower for interlocking movement of a lens in a viewfinder and that can be made compact and low in cost.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a first aspect of the present invention is a camera with a zoom function provided with a finder having a plurality of lens structures for performing a zooming operation in conjunction with zooming of a photographing lens. A finder that has a four-lens configuration and is supported by a supporting part that is movable in the optical axis direction, and performs a zooming operation by moving the two groups of lenses; And a rotary lens barrel having a cam surface on its outer peripheral portion for restricting the movement of the two groups of lenses, and a follower part abutting the cam surface of the rotary lens barrel. And a connecting portion formed in a specific manner. In the above configuration, with the rotation of the rotary lens barrel, the support portions of the two groups of lenses move via the connecting portion of the follower portion that comes into contact with the cam surface, and the zooming operation of the finder is performed. Since the supporting portions of the two groups of lenses are formed integrally with the connecting portion, the rotation of the rotary lens barrel is directly transmitted to the two groups of lenses, and the interlocking mechanism is simplified.

According to a second aspect of the present invention, there is provided a camera with a zoom function provided with a finder having a plurality of lens structures for performing a zooming operation in conjunction with zooming of a photographing lens.
A finder that has a lens configuration of a group and is supported by a supporting part that is movable in the optical axis direction and that performs a zooming operation by moving the lenses of the two groups; The inner surface of the side wall between the third lens group and the fourth lens group is inclined with respect to the optical axis. In the above configuration, it is reduced that the light incident on the finder is reflected by the side wall between the third lens group and the fourth lens group and enters the eyes through the finder.

According to a third aspect of the present invention, there is provided a camera with a zoom function provided with a finder having a plurality of lens structures for performing a magnification operation in conjunction with zooming of a photographing lens.
A finder having a group lens configuration, wherein the two groups of lenses are supported by a supporting portion movable in the optical axis direction, and a finder for performing a zooming operation by moving the two groups of lenses is provided; The end face is inclined with respect to the optical axis.
In the above-described configuration, no matter where the finder moves in the magnification operation, the light incident on the finder is reduced from being reflected by the outer peripheral end surfaces of the two groups of lenses and entering the eyes through the finder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a camera according to an embodiment of the present invention will be described with reference to the drawings. 1 is a front perspective view of the camera, FIG. 2 is a cross-sectional view of the camera when the lens barrel is wide, and FIG. 3 is a cross-sectional view of the lens barrel when telephoto. The camera 1 has a main body 3 covered by a cover 2 which is an exterior of the camera main body. A lens barrel 4 for holding a photographing lens, a finder 5, a flash 6, A
A light emitting / receiving element 7 for F, a light receiving element 8 for AE, a red-eye reduction lamp 9 and the like are arranged. A patrone chamber 11 and a spool chamber 12 are provided on the left and right sides of the lens barrel 4. The main body 3 is provided with side walls 13, 14, 15, 16 so as to surround the left, right, up and down of the lens barrel 4. A zoom motor 17 is arranged in a substantially triangular space formed by the lens barrel 4 and the side walls 13 and 15, and a zoom gear train 18 is arranged along the side of the lens barrel 4. The side wall 15 facing the zoom motor 17 is deformed outward according to the shape of the motor.

The lens barrel 4 is guided by the inner periphery of the guide tube 20 held by the main body 3 and performs a zoom operation from the collapsed state to the telescopic state through the wide state. Is provided with a rotating lens barrel 21, and on the outer peripheral surface of the rotating lens barrel 21, a driven gear 2 with which a zoom gear meshes.
2, a finder driving cam 24a with which the follower 23a of the finder side lever 23 is engaged, and a lens driving cam 24b. The lens barrel 4 includes photographing lenses 25, 26, 27, 28 and a shutter mechanism 29.
Is held. A control board 31 on which electric components for controlling the camera are mounted and an LCD for mounting an LCD for display and the like are provided on the upper portion of the side wall 15 of the main body 3.
A substrate 32 is arranged.

Further, a (driven) sprocket 33 meshing with the perforation of the film is provided rotatably in the vicinity of the lens barrel 4. The teeth provided on the outer periphery of the sprocket 33 project from an opening 35 formed directly above the image frame 34 of the main body 3 into the film guide portion 36, and the teeth mesh with the perforations of the film. The sprocket 33 rotates in accordance with the film feed amount, and from the contact piece 40 of the conductive member 39 slidably in contact with a pattern portion formed of a conductive portion and a non-conductive portion provided so as to be integrally rotatable therewith, A proportional electric signal can be extracted. The sprocket 33 is rotatably supported by a sprocket holder 37 fixed to the main body 3 in a state where the sprocket 33 enters the guide tube 20 directly above the image frame 34 of the main body 3. The lead portion 39a at one end of the conductive member 39 is connected to the control board 31 through the opening 44, and a contact piece 40 is provided on the other end side for sliding contact with the pattern portion. The opening 35 is provided between the rail 41 of the film guide section 36 and the film pressure plate pad 42.
Is formed between.

Next, the detailed configuration of the finder 5 will be described with reference to FIGS. 4 is a top view of the viewfinder 5 with the lid removed, FIG. 5 is a side sectional view of the viewfinder 5, and FIG. 6 is a view of the viewfinder 5 as seen from the peeping side. The viewfinder 5 includes four groups of lenses 51, 52, 53, and 54 that perform a zooming operation in conjunction with the zoom of the photographing lens. And a lid 56 to be covered, and is attached to the main body 3. The two groups of lenses 52 are supported by a holder 57 (support portion) so as to be movable in the optical axis direction.
The magnification operation is performed by moving the lens group 52. The holder 57 is provided with protrusions 58 and 59 formed at the lower end thereof so as to be slidable by being inserted into long holes formed in the case 55. In addition, this holder 57
A connecting lever 23 (connecting portion) having a follower 23a abutting on a finder driving cam 24a (cam surface) formed on the outer peripheral portion of the above-mentioned rotary lens barrel 21 is integrally connected. The connection is made by the protrusion 5 of the holder 57.
8, 59 are fitted into the holes of the connecting lever 23. The holder 57 or the connection lever 23 is always urged rearward by the other end of a spring 61 having one end hooked to a pin 60 provided in the case 55. The finder driving cam 24a regulates the movement of the two groups of lenses 52. When the rotary lens barrel 21 rotates,
The lens 52 moves between a position indicated by a solid line (wide) and a position indicated by a two-dot chain line (tele).

As described above, the holder 57 of the two lenses 52 is mounted on the cam 24 for driving the finder of the rotary barrel 21.
Since the rotation of the rotary lens barrel 21 is directly transmitted to the two groups of lenses 52, it is formed integrally with the connecting lever 23 having a follower 23a that comes into contact with the viewfinder 5a. The interlocking mechanism becomes simple.

The case 55 is positioned by fitting a pin 62 projecting from the bottom of the case 55 into a boss hole 63 of the main body 3 and adopting an equivalent structure (not shown) behind the same. , Fixed with screws.
The case 55 and the lid 56 are formed with a vertical wall 64 such that the cross-sectional area is smaller on the rear side in the optical axis direction than the position where the three groups of lenses 53 are fitted. A projection 65 is formed on the upper surface corresponding to the vertical wall 64, and the camera 1
The inner surface of the exterior cover 2 is received by the projection 65. As a result, since the vertical wall 64 has high strength, even if the exterior cover 2 is inadvertently pushed from the outside,
It does not bend.

Further, in the case 55, 3
The inner surface 66 of the side wall between the lens group 53 and the lens group 54 is inclined at an angle so that the rear side is lifted with respect to the optical axis. This prevents the light incident on the finder 5 from being reflected (surface-reflected) on the side wall between the third lens group 53 and the fourth lens group 54 and entering the eyes through the finder 5. In addition, the outer peripheral end surfaces 52a of the two lenses 52 are inclined at an angle so that the front side has a small diameter with respect to the optical axis. Thereby, the second group lens 52
Whatever position is moved by the zooming operation, the light incident on the finder 5 is prevented from being reflected by the outer peripheral end surfaces 52a of the second group of lenses 52 (edge reflection) and entering the eyes looking through the finder 5. I have.

Further, since the case 55 has a side surface and a bottom surface, a mold for resin molding may be an upper and lower mold having a simple structure, and can be manufactured at low cost. When assembling the finder 5, the holder 57 holding the lenses 51, 53, 54 and the lens 52 may be inserted from above into the case 55 from which the lid 56 has been removed, and the assembling property is good. The case 55 is integrally formed with a projection 68 for mounting an LED 67 for display, and a light shielding rib 69 made of irregularities is formed on the front side inner wall of the side surface and the bottom surface of the case 55. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention.

[0015]

As described above, according to the first aspect of the present invention,
Since the support portions of the two groups of lenses moved for finder zooming are integrally formed with a connecting portion having a follower portion abutting on the cam surface of the rotary lens barrel, the rotation of the rotary lens barrel is controlled by the follower portion. Can be directly transmitted to the two groups of lenses via the connecting portion, and the interlocking mechanism can be simplified, and the overall shape can be made compact. According to the second aspect of the present invention, since the inner surface of the finder side wall between the third lens group and the fourth lens group is inclined with respect to the optical axis, light incident on the finder is reflected by the side wall. Can be prevented from entering the viewfinder. Further, according to the third aspect of the present invention, since the outer peripheral end surfaces of the two groups of lenses are inclined with respect to the optical axis, even if the two groups of lenses of the finder are moved to any position by the zooming operation, they are moved to the finder. Can be prevented from being reflected by the outer peripheral end face and entering the eyes looking through the finder.

[Brief description of the drawings]

FIG. 1 is a front perspective view of a camera according to one embodiment of the present invention.

FIG. 2 is a sectional view when the lens barrel of the camera is retracted.

FIG. 3 is a sectional view of the lens barrel of the camera at the time of telephoto.

FIG. 4 is a top view of the finder with a lid removed.

FIG. 5 is a side sectional view of the same part.

FIG. 6 is a view of the viewfinder as viewed from a viewing side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera 3 Main body 21 Rotating lens barrel 23 Connecting lever (connecting part) 23a Follower 24a Viewfinder driving cam 25,26,27,28 Photographing lenses 51,52,53,54 Four groups of lenses 52a Outer circumference of two groups of lenses End face 55 Case 57 Holder (supporting part) 66 Inner surface of side wall

Claims (3)

[Claims] 1. A camera with a zoom function including a finder having a plurality of lens configurations for performing a zooming operation in conjunction with zooming of a photographing lens, comprising four groups of lenses and two groups of lenses in the optical axis direction. A finder which is supported by a movable portion and which performs a zooming operation by moving the two groups of lenses; and a cam surface which has a taking lens therein and regulates the movement of the two groups of lenses on the outer peripheral portion. And a connecting portion having a follower portion abutting on a cam surface of the rotary lens barrel and integrally formed with a support portion of the two groups of lenses. Camera with zoom function. 2. A camera with a zoom function including a finder having a plurality of lens configurations for performing a zooming operation in conjunction with zooming of a photographing lens, comprising four groups of lenses and two groups of lenses in the optical axis direction. A finder, which is supported by a movable portion and which performs a zooming operation by moving the two groups of lenses, a side wall between the third group of lenses and the fourth group of lenses, the side wall of the finder A camera with a zoom function, wherein the inner surface of the camera is inclined with respect to the optical axis. 3. A camera with a zoom function including a finder having a plurality of lens configurations for performing a zooming operation in conjunction with zooming of a photographing lens, comprising four groups of lenses, and two groups of lenses arranged in an optical axis direction. A finder that is supported by a movable portion and performs a zooming operation by moving the two groups of lenses, wherein the outer peripheral end faces of the two groups of lenses are inclined with respect to the optical axis. Camera with zoom function.