WO1994011782A1

WO1994011782A1 - Auxiliary device for stereography

Info

Publication number: WO1994011782A1
Application number: PCT/JP1993/001652
Authority: WO
Inventors: Hirozi Tanaka
Original assignee: Hirozi Tanaka
Priority date: 1992-11-16
Filing date: 1993-11-11
Publication date: 1994-05-26
Also published as: JPH06202252A

Abstract

This invention aims at provision of a portable auxiliary device for stereography which can arbitrarily change the angle of field and intensity of stereographic effects when taking a photograph. The device includes a reflecting mirror comprising first mirrors (21, 23) and second mirrors (22, 24) for reflecting the image of an object and guiding it to an imaging lens of a camera, wherein the first mirrors (21, 23) are fitted rotatably to the auxiliary device body in such a manner that an angle of reflection can be changed, and the first mirrors (21, 23) are foldable.

Description

Akira. Description Stereoscopic photography assistive device Technical field

The present invention relates to a three-dimensional photographing aid used by being attached to a camera. Background art

Conventionally, the power of a stereoscopic camera with two photographic lenses fixed to the main body of the camera is the same as that of a conventional camera for stereoscopic photography. It is a camera that is inferior in operability to recent advanced force cameras.

Therefore, an auxiliary tool that can be attached to a normal photographic camera to take a three-dimensional photograph has been developed, and a stereoscopic photograph has been taken using this auxiliary tool. This stereoscopic photography aid is a system in which images of different optical axes are respectively reflected by two sets of mirrors and guided to a photographic lens of a force camera. When attached and photographed, two sets of three-dimensional photographs are obtained for one frame of film. In order to view the photographed image as a stereoscopic image, various types of box-type or assembly-type viewing devices called so-called stereo viewers are used.

However, conventional mirror-type stereoscopic photography assistants that are commercially available have all mirrors fixed to the main body of the assistant, and the angle of reflection from the mirror is constant. Is always the same, and even if you try to change the angle of view and the strength of the three-dimensional effect according to the subject, you cannot do so. In addition, the entire aid is bulky and inconvenient to carry.

SUMMARY OF THE INVENTION An object of the present invention is to provide a three-dimensional photographing aid which is capable of arbitrarily changing the angle of view and the strength of a three-dimensional effect in taking a three-dimensional photograph within a certain range, and which is portable and convenient. Disclosure of the invention

The present invention relates to a stereoscopic photographing auxiliary tool which is used by being attached in front of a photographic lens of a power camera. The first mirror is rotatably attached to the auxiliary tool main body so that the reflection angle is variable, and the first mirror is foldable.

In addition, a darkening prevention band having a reflectance of 15 to 20% is formed inside the first mirror to prevent darkening occurring at the center of the photographed image, or any one of the first mirrors is eccentric. It is also possible to arrange them so that they are smaller than the other first mirror.

The stereoscopic photography assisting tool of the present invention has a mirror portion common to any of small to medium-sized ordinary photographing lens fixed type cameras. The mounting parts of the auxiliary tool to the camera are manufactured with a structure that is compatible with different types of cameras, and are selected and combined according to the power camera.

By folding the first mirrors on both sides, the three-dimensional photographing aid can reduce the overall volume and protect the mirror surface because the mirror surface is on the inside. At the time of shooting, the reflection angle can be adjusted by expanding the first mirror and adjusting the turning angle of the mirror.

In addition, a darkening prevention band is provided inside each of the first mirrors arranged on the left and right, and the occurrence of dark shadows occurring in the center of the photographed photograph can be prevented by relatively simple means. It is possible to obtain a stereoscopic photograph full of presence. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view showing a state in which a stereoscopic photographing aid according to one embodiment of the present invention is mounted on a force lens, FIG. 2 is a perspective view showing a state in which the photographing aid in FIG. 1 is folded, and FIG. ) Is a cross-sectional view of the unfolded photographing tool of FIG. 1, FIG. 3 (b) is a plan view of the folded state, FIG. 4 is a diagram showing the principle of stereoscopic photography, and FIG. 5 is a second embodiment of the present invention. FIG. 6 is a perspective view showing a state in which a stereoscopic photographing auxiliary tool according to an embodiment is attached to a force camera, and FIG. Fig. 7 is a side view showing the state where the mirror of Fig. 1 is folded, Fig. 7 is a cross-sectional view of the state in which the photographing tool of Fig. 5 is expanded, and Fig. 8 is an explanatory view showing a darkened state in the center of the stereoscopic photograph. FIG. 9 (a) is a side view showing a state in which the photographing tool shown in FIG. 5 is folded, and FIG. 9 (b) is a view as viewed from the arrow B in FIG. 9 (a).

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BEST MODE FOR CARRYING OUT THE INVENTION

In this embodiment, a film case, a viewfinder, a shirt,

A commercially available force called a film with a lens equipped with an Ilm winding knob. A stereoscopic photography aid 2 is attached to the front of the camera 1.

The principle of I 0 stereo photography is that the image of the optical axis P a is reflected by the first mirror Ma and the second mirror Ma ₂ on one side as shown in FIG. through and fill.厶F imaged as a subject image a, a first mirror M b of the image the other side of the optical axis P b, and. is reflected by the second mirror M b _2, through the lens L By forming an image as the subject image b on the film F, a set of two images is obtained for one frame of the film F. This and-out _15, depending on how to set the first mirror Ma There Mb, a second mirror one Ma _2, Mb ₂ mounting angle arrangement. The first mirror Ma, and Mb, interval of, The three-dimensional effect is determined. The subject distance range and the strength of the three-dimensional effect are determined.

The photographing aid 2 of the present embodiment is an application of the above principle, and images of two different optical axes are captured by the first mirror 21, 23 and the second mirrors ^ "22, 24 of the camera 1. 20 Guided to the lens L to form two adjacent images on the photographic paper.The distance d between the first mirror 21 and 23 and the maximum opening angle are the focal length of the camera lens of the camera, Is determined according to the distance range from the position of the force of the subject to be obtained and the degree of emphasis on the three-dimensional effect.

In the case of this embodiment, a commercially available camera 1 called a film with a lens is used.

The stereoscopic effect of the subject within a distance range of about l to 4m from the camera is obtained, and a sufficient stereoscopic effect is obtained when viewing stereoscopic photographs with a normal stereoscopic viewer. The maximum distance d between the first mirrors 21 and 23 is set to 150 mm, -A-

Angle is 45 degrees. The angle yS of the second mirror 22 and 24 is the first mirror

1 Reflection images from 2 1 and 2 3 are formed adjacent to one frame of film in the camera 1. In this embodiment, the angle 3 is set to 45 degrees. You have set.

Under the basic configuration described above, in the present embodiment, the first mirrors 21 and 23 are rotatably mounted on the auxiliary body, so that the reflection angle is variable and the folding is possible. RU That is, as shown in FIG. 3 (a), fan-shaped mounting portions 32 and 34 are formed above and below the base of the member 31 to which the mirror 21 is attached and the member 33 to which the mirror 23 is attached. Then, the mounting portions 32 and 34 are rotatably supported on both ends of the top plate 25 and the bottom plate 26 of the auxiliary tool body, respectively. Here., Shifted axially supported position P of the attaching portion 3 2, and a journalled 0 position P ₂ of the mounting part 3 4, only mirror one 2 1 member 3 1 of the thickness of the pasted to take the mirror. With When the folded members 31 and 33 are turned in the direction of arrow A and folded, the member 33 is made to overlap the member 31 as shown in FIG. 3 (b).

To fix the photographic aid 2 and the camera 1, attach the back of the photographic aid 2 to the front of the camera 1. Glue it with an adhesive (example in Fig. 1) or press the back of the photographic aid 2 Forming five locking parts (not shown) that sandwich the camera 1 and pressing the camera 1 from behind or from the side. The camera 1 is elastically pressed and fixed by the locking parts. • You can:

In the above configuration, when taking a stereoscopic photograph, mirrors 21 and 23 are attached. Expand members 31 and 33 to expand the shooting range (angle of view) or the distance to emphasize the stereoscopic effect. Adjust the reflection angle of the mirrors 21 and 23 according to the range and shoot. After photographing, the members 31 and 33 on which the mirrors 21 and 23 are attached can be folded down to reduce the bulk and make it easier to carry.

In the configuration of the mirror shown in FIG. 3, when the lens diameter of the camera 1 is small, an image of an abutting portion between the edges of the second mirrors 22 and 24 appears as blur on the photograph. In order to prevent this, a prism may be used instead of the mirrors 22 and 24.

FIG. 5 is a perspective view showing a second embodiment of the present invention, and FIG. 6 is a perspective view of the photographing aid shown in FIG. FIG. 3 is a side view showing the state in which the rack is folded. In this embodiment, the same reference numerals are given to those corresponding to the previous embodiment.

In the photographing aid 10 of the present embodiment, the member 42 with the mirror 41 attached thereto is made smaller than the member 33 with the other mirror 23 attached thereto, and the upper part of the mirror 41 is attached. The strobe 43 that is linked to the turtle 5 shirt 1 (not shown) is exposed. This makes it possible to perform stereoscopic photography in places where the amount of light is insufficient, such as at night.

Also, as shown in FIG. 7, the second mirrors 22 and 24 are arranged so that the images obtained by the mirror 41 and the mirror 23 are equally arranged on the left and right sides of the film surface. The small mirror 41 is eccentric to the 1 side, and L i <L ₂ .

10 Inside each of the mirrors 41 and 23, a gray anti-blackening band 44 having a width of 1 to 2 mm and a reflectivity of 18% is provided.

As a result, as shown in Fig. 8, the two dark shades shown in the center of the picture caused by the inner frames of the mirrors 41 and 23 become thinner, and become less conspicuous in the picture. Can be.

1 5 Anti-darkening zone 4 4 The reflectance of 4 should not affect the image very much.It is desirable to be 10 to 20% darker than the average tone, and it is dark if less than 10%. It becomes a shadow, and when it exceeds 20%, it becomes white. In particular, by setting the reflectivity to about 18%, it is possible to make the center border familiar and less noticeable to the whole image.

20 Such a blackening prevention band 44 can be formed inside the mirrors 41, 23 by molding, tape, sealing, painting, printing, or the like.

Reference numeral 45 denotes a band for attaching the photographing aid 10 to the camera 1. The band is attached to the camera 1 from above and attached below as shown in FIG. This band 45 can be folded and stored as shown in Fig. 9 when not in use.

As a preventive measure, protrusions 45a are formed on both sides of the belt as shown in FIG. 9 (b).

'· Also, in Fig. 5, reference numeral 46 denotes an auxiliary frame located in front of the viewfinder of camera 10. The auxiliary viewfinder 46 covers a part of the viewfinder of the camera 10 with the auxiliary viewfinder, so that the actual shooting range and the viewable range of the camera 10 are matched.

As described above, according to the stereoscopic photographing aid 10 of the second embodiment of the present invention, the stereoscopic photograph at night or the like can be obtained without impairing the stereoscopic effect of the photographing aid 2 described in the previous embodiment. In addition, it is possible to prevent dark shadows occurring in the center of the photographed image by relatively simple means, and to obtain a more realistic three-dimensional photograph. In addition, by making one mirror 42 smaller, the stereoscopic photography assistant 10 can be made more compact. Industrial applicability

The stereoscopic photographing aid of the present invention can be mounted on a commercially available power camera to take a set of two stereoscopic photographs for one frame of film.

Claims

The scope of the claims

1. A stereoscopic photographing aid that is used in front of a photographic lens of a power camera, a reflecting mirror comprising a first mirror and a second mirror that reflect an image of a subject and guide the image to the power lens of the power camera. A stereoscopic photographing auxiliary tool in which the first mirror is rotatably attached to the main body of the auxiliary tool so that the reflection angle is variable and the first mirror is foldable.

2. The three-dimensional photographing aid according to claim 1, wherein a blackening prevention band is formed inside the first mirror to prevent darkening occurring at the center of the photographed image.

3. The stereoscopic photography according to claim 1, wherein one of the first mirrors is arranged eccentrically, and is formed smaller than the other first mirror. Aids.