JPS6345089B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a multiformat camera.

One type of imaging camera is a multi-format camera that projects multiple images, the same or different, on a single photographic film (hereinafter referred to as film). The following two methods are known. The first method is a multi-lens method in which a plurality of lenses corresponding to the number of frames to be photographed are spatially arranged. In this method, each lens
Since the CRT monitor is placed away from the optical axis connecting each center of the film, optical distortion due to the asymmetric use of the lens cannot be ignored, and lenses with uniform optical characteristics must be prepared for the number of frames to be photographed. The disadvantages are that it is expensive, and that it is necessary to install as many electric shutters as there are lenses. The second method uses a single lens to perform multi-format photography.The CRT monitor and lens are integrated and are moved mechanically in a plane perpendicular to the optical axis to create the desired image on the film. This method shoots a number of frames. Although this method certainly eliminates the drawbacks of the first method, it is probably primitive and requires mechanical control to move a CRT monitor, which is relatively large in weight and volume. The overall structure is large and complicated, and has drawbacks such as being expensive and having poor reliability.

The present invention uses one lens, fixes the CRT monitor and film on the optical axis of the lens, and minimizes the number of movable parts, thereby creating a multi-function device that is free from optical distortion, has a simple structure, and is inexpensive. The purpose is to provide a format camera.

The multiformat camera according to the present invention includes:
A CRT monitor, a lens, and a film are each arranged on the optical axis, and the optical path length between the lens and the film is the length at which the image on the CRT monitor is captured in an area that is 1/4 of the effective area of the film. , the film is shortened by a length corresponding to 1/4 of the diagonal length of the film, and on the optical axis of the lens and between the lens and the film, a distance of approximately 45 mm is set relative to the optical axis. A first rotary reflecting mirror is arranged so as to have an inclination of .degree. and to stop intermittently in four diagonal directions of the film in a plane perpendicular to the optical axis. A second rotating reflecting mirror that rotates together with the rotating reflecting mirror of No. 1 is parallel to the first rotating reflecting mirror and by a distance corresponding to 1/4 of the diagonal length of the film. They are placed apart.

Embodiments of the present invention will be described below with reference to the drawings.

The drawing is a schematic perspective view of a four-frame multi-format camera that performs multi-format photography of video information according to an embodiment of the present invention. CRT
A monitor 1, a lens 2 equipped with an electric shutter mechanism 3, a first rotary reflecting mirror 4, and a film 5 are coaxially arranged in this order. The film 5 has a square effective projection surface in this embodiment,
Images on the CRT monitor 1 are photographed in four quadrants 5a, 5b, 5c, and 5d with the center 0 on the optical axis as the origin.

The first rotating reflector 4 is arranged to be inclined at an angle of approximately 45° with respect to a plane perpendicular to the optical axis (optical axis of the lens 2) _A0 of this multiformat camera, and The optical system is configured such that the surface is temporarily stopped at a position facing diagonally from the center ₀ of the film 5 to the first to fourth quadrants 5a, 5b, 5c, and 5d when viewed from the optical axis A0 direction. It is configured to rotate intermittently around the axis _A0 . A second rotary reflector 6, which rotates and stops integrally with the first rotary reflector 4, has a length corresponding to 1/4 of the diagonal length of the film. The first rotary reflecting mirror is spaced apart by a striking distance and parallel to the first rotating reflecting mirror.

Here, the distance between the lens 2 and the film 5 in the optical axis direction is such that the optical path length from the lens 2 to the film 5 via the first rotating reflecting mirror 4 and the second rotating reflecting mirror 6 is
The optical path length is shortened by a length corresponding to 1/4 of the diagonal length of the film with respect to the length between the lens and the film that allows the image on the CRT monitor 1 to be photographed to be 1/4 of the effective area of the film 5. It is determined that In other words, the first and second rotating reflectors extend the optical path from the rotating reflector 4 on the optical axis A ₀ to the film 5 by 1/4 of the diagonal length of the film 5 in the diagonal direction of the film 5. By this amount of parallel movement, the image on the CRT monitor 1 will be moved on the film 5 at a size equal to 1/4 of the diagonal length of the film 5 if the first rotating reflector 4 is not provided. The distance between the lens and the film is determined so that it is shorter than the distance between the lens and the film when the image is projected.

With such a configuration, when the first and first rotary reflecting mirrors 4 and 6, which are intermittently rotated together, come to the rotation angle position corresponding to the first film quadrant 5a, the CRT
Image on monitor 1 (indicated by an arrow image in the illustrated example)
is photographed on the first quadrant _5a of the film 5 from the optical path A1 from the lens 2 through the first rotating reflecting mirror 4 and the second rotating reflecting mirror 6. The first and second rotating reflectors 4 and 6 rotate 90 degrees from this position, and the second
When the position corresponding to the quadrant 5b is reached, the image on the first quadrant 5a disappears and the optical path also shifts to the optical path _A2 on the second rotary reflecting mirror 6 at this position.
The image on the CRT monitor 1 is captured on the film second quadrant 5b. In the same manner, both rotating reflectors 4 and 6 are
By rotating 90 degrees at a time, the optical path shifts to A ₃ and A ₄ ,
The video images on CRT monitor 1 are sequentially transferred to film 5.
are photographed in each quadrant. The electric shutter mechanism 3 is closed while the rotary reflecting mirrors 4 and 6 are rotating, and can be opened when each rotation of 90 degrees is completed.

In the present invention, by linking the image operation of the CRT monitor with the rotational operation of the rotating reflector and the shutter mechanism, it is possible to change the image captured on the film in various ways. It rotates intermittently with stops, and sequentially captures arbitrary images displayed on a CRT monitor at different locations (quadrants) on a single film. Further, the rotary reflecting mirror is not limited to stopping every 90 degrees, but can also be configured to stop a plurality of times at every desired angle depending on the required multiformat.

As described above, according to the present invention, the CRT monitor and the lens can be placed on the optical axis using a single-lens monocular system, thereby solving the problem of optical distortion caused by the conventional multi-lens system. Furthermore, despite being a monocular system, the only mechanically movable part is the rotating reflector, making the structure extremely simple. Only one shutter mechanism is required, and a four-screen multi-format can be realized at low cost by simply providing two rotary reflecting mirrors that rotate together.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a multiformat camera according to an embodiment of the present invention. 1... CRT monitor, 2... Lens, 3... Electric shutter, 4... First rotating reflector, 5... Photographic film, 6... Second rotating reflector, A ₀ ...
Optical axis, A ₁ to A ₄ ... optical path.

Claims (1)

[Claims] 1. A CRT monitor, a lens, and a photographic film are each placed on the optical axis, and there is a space between the lens and the photographic film with respect to the optical axis.
a first rotary reflecting mirror having an inclination of 45° and rotating around the optical axis and stopping intermittently at four positions diagonally of the photographic film is provided on the optical axis;
A second rotary reflector that rotates together with the first rotary reflector is separated from the first rotary reflector by a distance corresponding to 1/4 of the diagonal length of the photographic film. The lens and the photographic film are arranged parallel to the first rotary reflecting mirror, and the distance between the lens and the photographic film is such that the image on the CRT monitor is captured in an area that is 1/4 of the effective area of the photographic film. 2. A multi-format camera characterized in that the photographic film is arranged at intervals that are shorter by a length corresponding to 1/4 of the diagonal length of the photographic film.