JPH0545668U - camera - Google Patents

Abstract

(57) [Abstract] [Purpose] To achieve good portability and operability while making it possible to change both the focal length and screen size. [Configuration] The auxiliary optical system 70 is a light shielding tube 60 which is outside the optical path L2 and part of which is inside the optical path formed by the aperture 20 during panoramic photography in which the screen size changing plate 30 is projected into the aperture 20. It is swung to the inner position P. Further, the auxiliary optical system 70 is swung to a position where the optical axis thereof coincides with the optical axis of the main optical system 40 during normal shooting when the screen size changing plate 30 is retracted from the aperture 20.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a camera capable of changing both focal length and screen size.

[0002]

[Prior Art]

 Conventionally, as a camera whose focal length can be changed, as shown in FIG. 3, an optical path L3 formed by limiting an auxiliary optical system 82 to the aperture 81 side of the main optical system 80 in the camera body is formed. There is one that supports the optical path L3 from the outside so that it can move back and forth. In such a camera, the focal length is changed by moving the auxiliary optical system into or out of the optical path L3 from outside the optical path L3. On the other hand, a camera capable of changing the screen size from a normal size (24 × 36 mm for 35 mm film) to a panoramic size (13 × 36 mm) or a half size (24 × 18 mm) has been devised, and in recent years, Cameras that can change both focal length and screen size have been commercialized.

[0003]

[Problems to be solved by the device]

 In the above-described camera whose focal length can be changed, since the auxiliary optical system 82 is moved back and forth from the outside of the optical path L3 into the optical path L3, it is necessary to secure a space for accommodating the auxiliary optical system 82 exited from the optical path L3. In addition, for cameras that can change both the focal length and screen size, it is necessary to secure a storage space for the mechanism that changes the screen size in addition to the storage space for the auxiliary optical system. As a result, the size of the camera becomes large, which may impair portability and operability. The present invention is capable of changing both the focal length and the screen size, yet can be downsized, thereby providing a camera that can ensure good portability and operability. To aim.

[0004]

[Means for Solving the Problems]

 The camera according to the present invention is provided with a main optical system, an auxiliary optical system provided on the aperture side of the main optical system, and a second optical path that is movable in a first optical path formed by the aperture. A size changing member that forms an optical path to change the screen size, and the auxiliary optical system is located outside the second optical path from a position where the optical axis coincides with the optical axis of the main optical system, Is characterized in that it can move to a position within the first optical path.

[0005]

【Example】

 The present invention will be described below with reference to illustrated embodiments. 1 and 2 show the configuration of a 35 mm lens shutter type camera (hereinafter, simply referred to as a camera) which is an embodiment of the present invention. FIG. 1 is a state at the time of normal photographing, and FIG. 2 is a state at the time of panoramic photographing. It is the state of. In these figures, the camera moves the main optical system 40 along the optical axis direction and swings the auxiliary optical system 70 along the arrow A direction to switch the focal length between the wide-angle side and the telephoto side. Further, the camera moves the screen size changing plate 30 back and forth in the aperture 20 to switch the screen size between the normal size (24 × 36 mm) and the panoramic size (13 × 36 mm).

The aperture 20 is formed on the camera body 10 and regulates the light flux passing therethrough so as to have a normal screen size of 24 × 36 mm, so that the aperture 20 is normally provided between the main optical system 40 and the auxiliary optical system 70. An optical path L1 (hereinafter simply referred to as an optical path L1) at the time of shooting is formed.

Each of the screen size changing plates 30 is supported on the upper and lower ends of the aperture 20 of the camera body 10 so as to be swingable about a pin 31. Each screen size changing plate 30 is swung by a motor (not shown), and is projected inward from above and below the aperture 20. The screen size changing plate 30 regulates the upper and lower ends of the optical path L1 so that the screen size becomes a panoramic size while protruding into the aperture 20, and the optical path L2 at the time of panoramic photography with the main optical system 40. (Hereinafter, simply referred to as the optical path L2) is formed.

In the main optical system 40, the main lens frame 42 to which the main lens group 41 is fixed is fixed to the inner surface of the moving barrel 43. Upper and lower support arms 44 and 45 having through holes 46 and 48 are provided at the upper end and the lower end of the moving cylinder 43, respectively. A guide rod 47 is slidably fitted in the through hole 46 of the upper support arm 44. The guide rod 47 is provided on the camera body 10 in the optical axis direction. A female screw is provided on the inner surface of the through hole 48 of the lower support arm 45. A screw rod 49 is inserted into the through hole 48 in a state in which a male screw provided on the outer peripheral surface is screwed into a female screw of the hole 48. The screw rod 49 is rotatably supported by the camera body 10 in the optical axis direction. The screw rod 49 is connected to a motor (not shown) and is driven by the rotation of this motor. Therefore, when the screw rod 49 is rotated, the movable barrel 43 is driven along the screw rod 49 and the guide rod 47 by the screw action generated between the movable barrel 43 and the female screw of the through hole 48 of the lower support arm 45. Moved axially. A shutter unit 50 is provided on the inner surface of the movable barrel 43 closer to the aperture 20 than the main lens group 41.

A light shielding tube 60 is integrally provided in the camera body 10 between the aperture 20 and the main optical system 40. The light-shielding cylinder 60 is formed so as to cover the outside of the optical path L1, and the auxiliary optical system 70 can be housed in the space outside the optical path L2 and partly inside the optical path L1.

In the auxiliary optical system 70, an auxiliary lens frame 72 to which the auxiliary lens group 71 is fixed is supported by the camera body 10 via a swing arm 73 and a pin 74 so as to be swingable in the arrow A direction. The swing arm 73 is integrally formed on the upper portion of the auxiliary lens frame 72. This auxiliary optical system 70 has a position P (hereinafter referred to as “position P” in the light-shielding tube 60, which is outside the optical path L2 and part of which is inside the optical path L1 during panoramic photography in which the screen size changing plate 30 is projected into the aperture 20. , Panoramic position P). Further, the auxiliary optical system 70 has a position N (hereinafter, referred to as a normal position N) whose optical axis coincides with the optical axis of the main optical system 40 during normal imaging when the screen size changing plate 30 is retracted from the aperture 20. ) Is rocked.

The operation of this embodiment will be described. When switching from the normal shooting state (screen size of 24 × 36 mm) shown in FIG. 1 to the panoramic shooting state (screen size of 13 × 36 mm) shown in FIG. 2, the screen size changing plate 30 is centered around the pin 31. The upper and lower ends of the optical path L1 are regulated by rocking and projecting into the aperture 20 from the space deviated from the optical path L1 in the light shielding tube 60. Next, the auxiliary lens frame 72 is swung from the normal position N to the panoramic position P in the light shielding tube 60. In this state, the screw rod 49 is rotated, and the main lens group 41 is moved toward the aperture 20 side along the optical axis direction by the screw action generated between the screw rod 49 and the moving barrel 43. Thus, the light incident through the main lens group 41 is incident on the film surface through the optical path L2, the screen size is switched to the panoramic size, and the focal length is a short focus effective for panoramic shooting. Switch to the side.

When switching from the panoramic shooting state to the normal shooting state, the screw rod 49 is rotated in the opposite direction to the above case, and the main lens group 41 is moved by the screw action generated between the screw rod 49 and the moving barrel 43. Move to the subject side along the direction. Next, the auxiliary lens frame 72 at the panoramic position P in the light shielding tube 60 is swung to the normal position N. In this state, the screen size changing plate 30 is withdrawn from the inside of the aperture 20 and is swung to a position outside the optical path L1 inside the light shielding tube 60. As a result, the light incident through the main lens group 41 and the auxiliary lens group 71 is incident on the film surface through the optical path L1, the screen size is switched to the normal size, and the focal length is switched to the long focus side.

As described above, according to the above-described embodiment, the space inside the light-shielding tube 60, which is outside the optical path L2 and partially inside the optical path L1, is used for the auxiliary optical system 70 during panoramic shooting and the normal optical shooting. The screen size changing plate 30 can be shared as a storage space for each of them, and thus, both the focal length and the screen size can be changed, but the size can be reduced.

In the above-described embodiment, the F value of the optical system changes between normal shooting and panoramic shooting as the auxiliary lens group 71 moves back and forth in the optical path. The exposure time of the shutter unit 50 is changed accordingly. That is, since the F value is larger (darker) in the normal photographing than in the panoramic photographing, the exposure time is changed and the shutter unit 50 is controlled so that the exposure amount is always constant.

Further, in the above embodiment, the focal length is changed in accordance with the change of the screen size. However, the focal length can be changed only in the panoramic photographing state. Good.

Further, although the screen size can be changed to the normal size and the panoramic size in the above embodiment, the auxiliary lens group 71 may be formed by changing the screen size to the normal size and the half size. The concave lens system or the convex lens system may be used. If the auxiliary lens group 71 is a convex lens system after the screen size can be changed between normal size and half size, the focal length on the short focus side during normal shooting and the focal length on the long focus side during half size shooting. Can be taken at. In particular, when shooting at the focal length on the long focal length side during half-size shooting, the telescopic effect is enhanced in combination with the half size of the screen in the width direction. In the half-size shooting, if the film feed amount is set to 1/2 of the normal feed amount, it is possible to eliminate a blank portion that would be generated in the film with the normal feed amount.

Further, the screen size may be changed during the shooting of one film.

Although the lens shutter type camera using the 35 mm film is used in the above embodiment, it may be a focal plane type camera or a film of any size.

[0019]

As described above, according to the present invention, both the focal length and the screen size can be changed, but the size can be reduced, thereby ensuring good portability and operability. can do.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state of a camera according to an embodiment of the present invention during normal shooting.

FIG. 2 is a cross-sectional view showing a state of the camera of FIG. 1 during panoramic photography.

FIG. 3 is a sectional view showing a conventional camera.

[Explanation of symbols]

20 Aperture 30 Screen size changing plate (size changing member) 40 Main optical system 70 Auxiliary optical system L1 Optical path for normal shooting (first optical path) L2 Optical path for panoramic shooting (second optical path) N Normal position (optical axis) Is a position at which the optical axis of the main optical system matches) P Panorama position (position outside the second optical path and at least part of which is inside the first optical path)

Claims (3)

[Scope of utility model registration request] 1. A main optical system, an auxiliary optical system provided on the aperture side of the main optical system, and a first optical path formed by the aperture so as to be movable back and forth to form a second optical path. The auxiliary optical system is outside the second optical path from a position where the optical axis coincides with the optical axis of the main optical system, and at least a part of the auxiliary optical system is the first optical system. A camera that can be moved to a position within the optical path. 2. The auxiliary optical system is moved to a position outside the second optical path and at least partly inside the first optical path when the size changing member is advanced into the first optical path. The camera according to claim 1, wherein the optical axis is moved to a position where the optical axis coincides with the optical axis of the main optical system when the size changing member is withdrawn from the first optical path. 3. A space occupied by an auxiliary optical system that has been moved to a position outside the second optical path and at least part of which is inside the first optical path, and a size change that is retreated to the outside of the first optical path. The camera according to claim 2, wherein the spaces occupied by the members at least partially overlap.