JPH0545750A - Stereoscopic camera - Google Patents

Abstract

PURPOSE:To obtain a stereoscopic camera capable of photographing a stereoscopic image not having a difference in an exposure, regardless of compactly incorporating two sets of photographing optical systems composed of a lens and two mirrors. CONSTITUTION:This stereoscopic camera 1 has left and right lenses 2 and 3. They are the retrofocus type lenses of the same item, their second main point positions are in the vicinities of second mirrors 5 and 7, and slit shutters 10 and 11 are provided thereon, respectively. The lenses 2 and 3 are arranged on locations held between the first and second mirrors 4 and 5, and the first and second mirrors 6 and 7, respectively. When the slit shutters 10 and 11 are moved so as to cross photographing luminous flux, the photographing luminous flux is exchanged left and right by a mirror, which is shown by optical axes La and Lb, and reaches a film 9. Thus, two images 9a and 9b having parallaxes on both sides are simultaneously, photographed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic camera utilizing binocular parallax.

[0002]

2. Description of the Related Art A method of stereoscopically viewing an image by simultaneously observing two printed photographs having parallax on the left and right with the left and right eyes is known. For such a stereoscopic view, a camera that simultaneously takes two photographs with parallax in the left-right direction is required. The stereoscopic camera used for this purpose generally has two sets of a photographing optical system consisting of a lens and two mirrors arranged, and a photographic image for observing the right eye and a photographic image for observing the left eye are film-formed. Swap on the screen and shoot. Then, when printing these two photographic images at the same time with one lens at the time of printing, the images for right-eye observation and left-eye observation are replaced again, and the two frames returned to the original arrangement are restored. The image can be obtained on one printed photograph.

[0003]

However, in the above-mentioned stereoscopic camera, in order to interchange the photographic image for the right eye observation and the photographic image for the left eye observation on the film surface, each photographing optical system has a rear lens behind. It is necessary to place at least one mirror in. For this reason, the focal length of the lens becomes long, which not only makes the camera large, but also makes it difficult to obtain an image with a rich stereoscopic effect. Also,
Exposure with a conventional shutter causes a slight difference in exposure between the central portion and the peripheral portion of the printed image, and the individual images themselves may lack clarity.

The present invention has been made to solve the above-mentioned drawbacks of the prior art. It is compact and rich in stereoscopic effect while incorporating two sets of photographing optical systems each including a lens and two mirrors. An object of the present invention is to provide a stereoscopic camera capable of taking a clear photographic image.

[0005]

In order to achieve the above object, the present invention uses retrofocus type lenses for the left and right lenses, and sets the second principal points (the principal points on the image side) of these lenses respectively. Near the second mirror of
By arranging a slit shutter at the position of the principal point and performing slit exposure, the mirror and shutter are downsized.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 schematically show the internal structure of a stereoscopic camera 1 embodying the present invention. This stereoscopic camera 1 has left and right lenses 2 and 3, both of which use a retrofocus type lens having a second principal point (image-side principal point) between the lens and the focal plane. This lens 2, 3
Is provided at a position sandwiched by the first mirror 4 and the second mirror 5 and between the first mirror 6 and the second mirror 7. Subject 9
As shown by the optical axes La and Lb, the photographing light flux of is reflected by the mirrors 4 and 6 and passes through the lenses 2 and 3, and then is reflected again by the mirrors 5 and 7 and reaches the film 9. The lenses 2 and 3 are retrofocus type lenses having the same specifications, and slit shutters 10 and 11 are provided at the positions of the second principal points.

Since the position of the second principal point is placed in the vicinity of the mirrors 5 and 7 and the slit shutters 10 and 11 are provided at the positions of the second principal points, the mirrors 5 and 7 are also slit shutters 10 and 1.
1 can also be downsized. The shutters 10, 11
At the same time when the shutter button is operated, the slit crosses the light beam and exposes the slit. The film 9 has two images 9a, 9 with parallax left and right for the same subject 8.
The left and right sides of b are interchanged and the picture is taken. Reference numeral 12 indicates a partition wall so that the images do not overlap each other at the boundary between the images 9a and 9b.

The operation of the stereoscopic camera 1 will be described. When the shutter button is pressed after the shutter charge, the slit shutters 10 and 11 simultaneously move so as to cross the front surfaces of the second mirrors 5 and 7, and slit exposure is performed.
The light beams reflected by the mirrors 4, 6 according to the optical axes La, Lb pass through the lenses 2, 3 and are reflected again by the mirrors 5, 7 to be interchanged between the left and right to reach the film 9. As a result, the images 9a and 9b having parallax on the left and right are captured. When slit exposure is performed with the slit shutter, a sharper image can be obtained because the exposure difference between the central portion and the peripheral portion of the image is small. Images 9a, 9b from the negatives thus taken
A pair of printed photographs can be obtained by printing with a pair of.

In FIG. 2, the lenses 2 and 3 of the stereoscopic camera 1 have a second principal point, the intersection of the optical axis La and the second mirror reflecting surface 5a, and the optical axis Lb and the second mirror reflecting surface 7b. It is illustrated that it was placed at the intersection. Solid lines on both sides of the optical axis La and the optical axis Lb in the drawing represent representatives of the chief rays among the rays emitted from the subject. Since all the chief rays pass through the second principal point, the sizes of the second mirrors 5 and 7 can be sufficiently reduced. Similarly, slit shutter 10,1
1 can also be made sufficiently smaller than the focal plane shutter.

In the stereoscopic camera 1 according to the embodiment of the present invention described above, the two first cameras that receive the image light flux are used.
The mirrors may be separated from each other on the left and right, and may be vertically displaced so that the image has a vertical parallax. Further, the left and right optical axes La and Lb may be intersected with each other to give a degree of freedom to the arrangement of mirrors and lenses.

[0011]

As described above, in the stereoscopic camera of the present invention, the retrofocus lens is arranged between the first mirror and the second mirror, and the second principal point of the retrofocus lens is located behind the lens. Since they are set close to each other, wide-angle shooting can be performed even if the distance from the lens to the film surface is increased, and the second mirror can be made small. Further, since the slit shutter is used to perform the exposure at the position of the second principal point, the exposure difference between the central portion and the peripheral portion of the captured image can be significantly reduced, and the shutter mechanism can be compact. it can.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an internal structure of a stereoscopic camera embodying the present invention.

FIG. 2 is an explanatory diagram of an internal structure of the stereoscopic camera shown in FIG.

[Explanation of symbols]

 1 stereoscopic camera 2,3 lens 4,6 first mirror 5,7 second mirror 10,11 slit shutter 12 partition wall

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shunkichi Igarashi 2-26-30 Nishiazabu, Minato-ku, Tokyo Fuji Photo Film Co., Ltd.

Claims (1)

[Claims] 1. A stereoscopic camera for arranging a pair of photographing optical systems, in which first and second mirrors are arranged in front of and behind the lens, side by side so as to photograph two images having a parallax in the left-right direction, the lens being a retrofocus lens And set its second principal point in the vicinity of each second mirror.
A stereoscopic camera characterized in that slit shutters are provided at the positions of the principal points.