JPH0631461Y2 - Variable focal length waterproof camera with underwater viewfinder - Google Patents

Description

[Technical Field] The present invention relates to a variable focal length waterproof camera having a variable viewfinder underwater finder device.

“Prior Art and Its Problems” When using a waterproof camera underwater, the photographer uses underwater glasses, and thus the eye cannot be brought close to the eye point of the finder device on the ground. For this reason, it is usual to use an underwater finder device in which the eye point is shifted rearward.

By the way, in all conventional waterproof cameras, the field of view of the underwater finder device is fixed because the focal length of the taking lens system is fixed. However, in a waterproof camera equipped with a zoom lens or a long / short bifocal type focal length changing mechanism, it is desirable to change the viewfinder field along with the change of the focal length.

"Purpose of Invention" The present invention aims to obtain a waterproof camera equipped with an underwater viewfinder device capable of changing the viewfinder field according to the change of the focal length based on such a new problem awareness.

[Outline of the Invention] The present invention has a waterproof camera equipped with a mechanism for changing the focal length of the taking lens system; has a retracted eyepoint for underwater glasses, and has a movable visual field changing member for changing the viewfinder visual field to a large or small size. , Underwater viewfinder device provided separately from the waterproof camera; Rotating in conjunction with changing the focal length of the shooting lens system, drive joint exposed to the waterproof camera; Rotating in conjunction with the field-of-view changing member , A driven joint exposed and provided in the underwater finder device; and with the drive joint and the driven joint connected,
A mounting mechanism for mounting the underwater viewfinder device to the waterproof camera;
It is characterized by having.

"Embodiment of the Invention" The present invention will be described below with reference to illustrated embodiments. 1 to 4 show a first embodiment of the present invention. This embodiment is an embodiment in which the present invention is applied to a lens shutter type waterproof camera having a zoom lens system. In the camera body 11 having a waterproof structure, variable power lens systems L1 and L2 of two groups, front and rear, are provided so as to be movable in the optical axis direction.
The variable-magnification lens systems L1 and L2 move in a predetermined relationship in the optical axis direction in response to the rotation of the cam ring 12 by a well-known cam and pin interlocking mechanism with the cam ring 12. The composite focal length changes. 13 is a camera body 11
It is a waterproof glass on the front edge.

The cam ring 12 is a gear train 1 that receives rotation of the drive motor 14.
5 and a gear 12a provided on the cam ring 12, which meshes with the final gear 15a of the gear train 15, and is driven to rotate. The rotation of the drive motor 14 is performed by the drive train 1 through the gear train 16 and the worm wheel mechanism 17.
8 is transmitted. The drive joint 18 is exposed at the center of an underwater finder attachment / detachment screw 19 provided on the upper surface of the camera body 11, and an interlocking groove 20 is formed on the upper surface thereof. In the rotating part of this drive joint 18,
The O-ring 21 is fitted so that liquid tightness is maintained.

The underwater finder device 30 is attached to and detached from the underwater finder attaching / detaching screw 19, and an attaching / detaching ring 31 screwed to the underwater finder attaching / detaching screw 19 is rotatably supported on the lower portion thereof. A driven joint 32 is rotatably supported at the center of rotation of the attaching / detaching ring 31, and the driving joint 18 is attached to the driven joint 32.
An interlocking protrusion 33 that engages with the interlocking groove 20 is provided.

On the finder optical axis of the underwater finder device 30, fixed lenses 34 and 35 are provided in front of and behind it, and a movable lens 36 is provided in the center. As shown in FIG. 3, the movable lens 36 is provided with a guide protrusion 38 on a side portion of a lens frame 37 thereof, and the guide protrusion 38 is provided in a finder frame body 39 and is provided with a guide slot 40 parallel to the optical axis. It is possible to move in the direction of the optical axis.

And under the lens frame 37 of the movable lens 36,
An interlocking groove 41 is formed in a direction parallel to the direction orthogonal to the optical axis. On the other hand, the drive disc 42 provided integrally with the driven joint 32 has the interlocking groove 41 at its eccentric position.
The drive pin 43 that fits in is vertically fixed. Therefore, when the driven joint 32 rotates, due to the relationship between the drive pin 43 and the interlocking groove 41, the lens frame 37, that is, the movable lens 3
6 moves in the finder optical axis direction, the combined focal length of the fixed lens 34, the movable lens 36, and the fixed lens 35 changes, and the field of view changes. The eye point of the finder optical system formed by the fixed lens 34, the movable lens 36, and the fixed lens 35 is set so that an appropriate finder field of view can be obtained when a photographer wearing underwater glasses looks into the eye point. Reference numeral 45 indicates an O-ring that maintains liquid tightness on the side of the underwater finder device 30.

Although the structure of the finder device 50 for the ground is not a problem of the present invention, FIG. 3 shows an example of a main part thereof.
The movable lens 51 in the ground finder device 50 is movably supported in the optical axis direction via a lens frame 52, a guide protrusion 53, and a guide slot 54, and a flat cam 55 is left and right above the movable lens 51. It is supported so that it can move in any direction. The cam groove 56 formed in the flat cam 55 is engaged with the interlocking pin 57 protruding from the lens frame 52, and when the flat cam 55 moves in the left-right direction, the movable lens 51 moves in the optical axis direction. , The viewfinder field changes. The flat cam 55 is linked to the drive motor 14 via a rack 58 formed on the flat cam 55 and a gear train 59 that meshes with the rack 58, so that the ground finder device 50 can adjust to changes in the focal length of the taking lens system. The fields of view are linked.

As is apparent from the above configuration, the underwater finder attaching / detaching screw 19 constitutes a mounting portion for mounting the underwater finder device on the waterproof camera, and the drive joint 18 and the driven joint 32 rotate the drive motor 14 as a focal length changing mechanism. To a drive disk 42 that constitutes a visual field changing mechanism.

Therefore, the device having the above-mentioned configuration, when used in water,
As shown in FIG. Second
Attach as shown. In this state, when the drive motor 14 is driven by a waterproof switch (not shown) provided on the camera body 11, the variable magnification lens system L is driven by the gear train 15.
1 and L2 move in the optical axis direction, and the focal length of the taking lens system changes.

When the drive motor 14 rotates, the drive joint 18 rotates via the gear train 16 and the worm wheel mechanism 17, and the driven joint 32 connected to the drive joint 18 also rotates. Therefore, the driven joint 32
As described above, the movable lens 36 moves in the optical axis direction due to the relationship between the drive pin 43 and the interlocking groove 41 as the drive disk 42 rotates, and the underwater viewfinder field has a focal length of the taking lens system. Change according to.

5 and 6 show a second embodiment of the present invention. In this embodiment, a so-called sports finder is devised for an underwater finder device. This underwater finder device determines the finder field from the fixed frame 61 and the movable frame 62. The horizontal arm 62a below the movable frame 62 is provided with the interlocking groove 41 of the lens frame 37 in the first embodiment. A corresponding interlocking groove 63 is formed, and the drive pin 43 of the drive disc 42 is fitted in the interlocking groove 63. Therefore, according to this embodiment, as the focal length of the taking lens system changes, the movable frame 62 moves, for example, between the solid line and the alternate long and short dash line in FIG. It can be changed according to changes.

It should be noted that this embodiment can also be applied to a waterproof camera of the type in which the focal length of the taking lens system changes to long and short bifocals. In this case, the stop positions of the movable frame 62 may be set at two positions, front and rear.

Further, FIG. 7 shows another embodiment suitable for application to a waterproof camera of the type in which the focal length of the taking lens system changes to long and short bifocals. In this embodiment, the visual field changing lens 65 corresponding to the movable lens 36 of the first embodiment is moved into and out of the finder optical system by the rotating operation of the driven joint 32. The field-of-view changing lens 65 is rotatably supported around a lower rotation shaft 66, and is normally biased by a torsion spring 67 in a direction to advance into the finder optical system. An interlocking pin 68 is provided on the side portion of the field-of-view changing lens 65 so as to project, and the interlocking pin 68 is fitted between the forks 70 of the drive arm 69 movably supported in the vertical direction in the drawing. ing. The drive arm 69 has a follower 71 at the lower end thereof, and the follower 71 is engaged with an end surface cam 72 formed on the lower surface of the drive disc 42. When the recess 72 a is engaged with the follower 71, the end surface cam 72 is driven by the drive arm 6.
9 is moved up, and at this time, the field-of-view changing lens 65 is positioned in the finder optical system. On the other hand, when the flat portion 72b is engaged with the follower 71, the drive arm 69 descends and the field-of-view changing lens 65 retracts from the viewfinder optical system. Therefore, according to this embodiment, if the driven joint 32 (that is, the drive joint 18) is reciprocally rotated by a predetermined angle in response to the switching between the long and short bifocals of the taking lens system, the focal length of the taking lens system will be the viewfinder field. Can be dealt with.

"Effect of the invention" As described above, according to the present invention, when a detachable underwater viewfinder is attached to the camera, the focal length of the camera is changed with respect to the waterproof camera with the taking lens system whose focal length changes. The field of view of the underwater finder device changes in conjunction with the mechanism. Therefore, even underwater, it is possible to obtain a photograph with a small error between the viewfinder field and the actual photographing screen.

[Brief description of drawings]

1 to 4 show a first embodiment of the underwater finder apparatus of the present invention, and FIGS. 1 and 2 show a mounting state on a camera body. FIG. 3 is a cross-sectional view of different focal length states, FIG. 3 is an exploded perspective view of the main portion, and FIG. 4 is a perspective view of a waterproof camera and the underwater finder device in a separated state. FIG. 5 and FIG. 6 are perspective views and sectional views of the essential part showing the second embodiment of the present invention, and FIG. 7 is a perspective view of the essential part showing the third embodiment of the present invention. L1, L2 ... Variable magnification lens system (shooting lens system), 11 ...
... Camera body, 12 ... Cam ring, 14 ... Drive motor, 15,16 ... Gear train, 17 ... Warm wheel mechanism, 18 ... Drive joint, 19 ... Underwater finder mounting screw, 20 ... Interlocking groove , 30 …… underwater finder device, 31 …… detachable ring, 32 …… driven joint, 3
3 ... interlocking protrusions, 34, 35 ... fixed lens, 36 ...
Movable lens, 37 ... Lens frame, 38 ... Guide protrusion,
39 ... Finder frame, 40 ... Guide slot, 4
1 ... interlocking groove, 42 ... drive disk, 43 ... drive pin,
50: Ground finder device, 61: Fixed frame, 62
...... Movable frame, 65 ...... Field of view changing lens, 66 ...... Rotation axis, 67 ...... Torsion spring, 68 ...... Interlocking pin, 69
...... Drive arm, 70 ...... fork, 71 ...... follower, 72 ...... end face cam.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Ogawa 2-39-9 Maenocho, Itabashi-ku, Tokyo Asahi Kogaku Kogyo Co., Ltd. (72) Inventor Masakatsu Hori 2-36 Maeno-cho, Itabashi-ku, Tokyo 9 Asahi Kogaku Kogyo Co., Ltd. (72) Inventor Toshiaki Ueda 2-36 Maeno-cho, Itabashi-ku, Tokyo 9 Asahi Kogaku Kogyo Co., Ltd. (72) Fuminori Ueno 2-36 Maeno-cho, Itabashi-ku, Tokyo No. 9 in Asahi Gaku Gakuin Co., Ltd. (56) Reference JP-A-61-26029 (JP, A) JP-B-38-25093 (JP, B1) JP-B-55-52410 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A waterproof camera having a mechanism for changing the focal length of a photographing lens system; the waterproof camera having a retracted eye point for underwater glasses, and having a movable visual field changing member for changing the view field of the viewfinder. Underwater finder provided separately from the above; a drive joint exposed and exposed to the waterproof camera that rotates in conjunction with the focal length changing operation of the taking lens system; rotates in conjunction with the visual field changing member And a driven joint exposed on the underwater finder device; and a mounting mechanism for mounting the underwater finder device on a waterproof camera in a state in which the drive joint and the driven joint are connected to each other. , Variable focal length waterproof camera with underwater viewfinder.