JP2001109089A - Stereoscopic image photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic image photographing device capable of photographing an image having a fully stereoscopic effect by using a normal camera where a lens mounting part is small. SOLUTION: As for the device, plural apertures 14L(R) are arranged in the diaphragm surface of a camera lens and light is transmitted through one of the apertures, but, light is interrupted by the other, then, by successively switching the aperture for transmitting the light, the stereoscopic image is photographed in time-division manner, and optical elements 12L(R) and 13L(R) for changing the advancing direction of the light are separately arranged adjacent to plural apertures, then, a distance between the apertures is equivalently enlarged, then, the image having the fully stereoscopic effect can be photographed even though a small lens is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional image photographing apparatus, and more particularly to an apparatus for photographing a three-dimensional image by time division.

[0002]

2. Description of the Related Art The present applicant has previously proposed a stereoscopic image photographing apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 10-271534 as an apparatus for photographing a stereoscopic image. Referring to FIG.
The principle of the three-dimensional image photographing device disclosed in Japanese Patent Publication No. 271534 will be described.

The apparatus comprises a front lens group 81 for converting light of a subject into parallel light, a rear lens group 85 for forming an image of the parallel light on an image pickup plate, and a predetermined lens centered on an optical axis 87 of these lens groups. The front lens group 81 is disposed at a position separated by a distance.
Shutters 84L for transmitting or blocking light from
84R. Each of the front lens group 81 and the rear lens group 85 is a combination lens including a plurality of lenses, but each is illustrated as a single lens for simplification of the drawing. In addition, this apparatus is for photographing a general subject, but consider a case in which a point light source 88a indicated by a black circle and a point light source 88b indicated by a black square are imaged for easy understanding. Also, consider a case where the focal length of the front lens group 81 is equal to the distance between the front lens group 81 and the point light source 88a. Thus, the light of the point light source 88a becomes parallel light after passing through the front lens group 81.

FIG. 8A shows a case where light is transmitted by the shutter 84L and light is shielded by the shutter 84R. The light of the point light source 88a includes a front lens group 81, a shutter 84L,
After passing through the rear lens group 85, an image is formed at a position 89a on the imaging plate. At this time, the light of the point light source 88b reaches the vicinity of the position 89bL on the imaging plate and is photographed. Other light, for example, the light beam 80R is not photographed because it is blocked by the shutter 84R. As a result, as shown in FIG. 8B, an image in which the point light source 88b is located on the left side of the point light source 88a is captured.

FIG. 8 (c) has the same configuration as that of the apparatus shown in FIG. 8 (a), except that the shutter 84R transmits light and the shutter 84L blocks light. Point light source 8
After passing through the front lens group 81, the shutter 84R, and the rear lens group 85, the light 8a forms an image at a position 89a on the imaging plate. At this time, the light from the point light source 88b is
It reaches near bR and is photographed. Other light, for example, the light beam 80L is not photographed because it is shielded by the shutter 84L. As a result, an image in which the point light source 88b is located on the right side of the point light source 88a as shown in FIG.

When comparing the two images shown in FIGS. 8B and 8D, based on the position of the point light source 88a in each image, the point light source 88b is located on the left side in FIG.
In (d), the image is shot on the right side. This difference in position corresponds to the difference in depth between the point light sources 88a and 88b. actually,
When the image in FIG. 8B is viewed with the left eye and the image in FIG. 8D is viewed with the right eye, the image looks three-dimensional.

[0007]

In the above-described conventional three-dimensional image photographing apparatus, when the distance between two shutters is reduced, an image photographed through each shutter, that is, FIG.
The difference between (b) and (d) is reduced, and the three-dimensional effect is impaired. Therefore, it is necessary to increase the interval between the two shutters so as to obtain a required three-dimensional effect. Accordingly, it is necessary to increase the diameters of the front lens unit and the rear lens unit.

In general optical cameras and television cameras,
The dimensions of the part to attach the lens are fixed. For example, a standard for a shape called a C-mount or an F-mount is defined, and many cameras conforming to the standard are commercially available. When these cameras are used for photographing a stereoscopic image, a lens for photographing a stereoscopic image attached to the camera must also satisfy the above-mentioned standard. That is, in the above-described conventional stereoscopic image photographing apparatus, the diameter of the rear lens group cannot be made larger than the dimension of the portion of the camera body to which the lens is attached.

[0009] When these are combined, the following conclusions are obtained. When a general optical camera or television camera currently on the market is used for capturing a three-dimensional image, a conventional three-dimensional image capturing apparatus cannot capture a three-dimensional image having a sufficient three-dimensional effect. The present invention has been made in view of these circumstances, and a first object of the present invention is to provide a stereoscopic image photographing apparatus that photographs a stereoscopic image having a sufficient stereoscopic effect using a rear lens group having a small diameter. It is.

Further, it is not easy to adjust the strength of a three-dimensional effect in a general three-dimensional image photographing apparatus. For example, in the case of a system in which two cameras are juxtaposed, it is necessary to change the interval between the two cameras, and a large-scale mechanism for changing the positions of the cameras is required. The present invention has been made in view of these circumstances, and a second object of the present invention is to adjust the strength of the three-dimensional effect equivalent to changing the camera interval with the same operability as a normal camera zoom lens. It is intended to provide a stereoscopic image photographing apparatus.

[0011]

To achieve the above object, a three-dimensional image photographing apparatus according to the present invention comprises: a first optical element for converting light of a subject into parallel light; A stereoscopic image photographing apparatus comprising: a second optical element to be driven; and a plurality of mechanical or electronic shutters between the first and second optical elements, which are sequentially opened and closed in time. A first ray trajectory changing means which is located between the first optical element and the plurality of shutters and which bends the direction of light of the subject toward the optical axis of the first and second optical elements; A second method for returning the direction of the light beam bent by the first light beam path changing means to the direction before bending.
And a ray trajectory changing means.

Here, the first and second ray trajectory changing means may be prisms that change the path of light by refraction, or mirrors that change the path of light by totally reflecting light. Is also good. Furthermore, in order to adjust the strength of the three-dimensional effect, a mechanism for adjusting the interval between the first ray trajectory changing means and the second ray trajectory changing means may be added.

The mechanism for adjusting the distance may move an optical prism, which is first ray trajectory changing means, along the optical axis, or move a mirror, which is second ray trajectory changing means, to the optical axis. A mechanism for moving the mirror along the optical axis or moving the mirror as the first ray trajectory changing means perpendicular to the optical axis may be used. Still further, the first optical element may be a zoom lens optical system capable of changing a photographed size of a subject without changing a focus position.

[0014]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Figure 1 shows the first
FIG. 3A is a diagram for explaining the embodiment of FIG.
4L illustrates an optical path when light is transmitted, (b) illustrates a captured left-eye image, (c) illustrates an optical path when the shutter 14R transmits light, and (d) illustrates a captured right-eye image.

The apparatus according to the first embodiment of the present invention shown in FIG.
A front lens group 11 that converts the light of the subject into parallel light, and prisms 12L and 12R that bend the traveling directions of the light 10L and 10R of the subject passing through the front lens group 11 toward the optical axis 17 side.
And the other prisms 13L and 13R for returning the traveling direction of light after passing through the prisms 12L and 12R to the traveling direction before passing through the prisms, and alternately repeating transmission or blocking of light temporally. With the prism 13
Shutters 14L and 14R for selecting and passing only one of the light that has passed through L and 13R,
And a rear lens group 15 for forming an image of the light passing through the L and 14R on the imaging plate 16. Prism 1 here
Each of 2L and 12R is a half of a conical prism (cone prism). Prism 1
3L and 13R are halves each of which is obtained by hollowing a cone prism from a cylinder. FIG. 1 shows a sectional view of these prisms 12L, 12R, 13L and 13L.
R is drawn as a triangle.

Front lens group 1 of prisms 12L and 12R
The surface on the one side and the surface on the rear lens group 15 side of the prisms 13L and 13R are the optical axis 17 of the lens groups 11 and 15.
Perpendicular to Further, the prism 12L and the prism 13L
The surfaces facing each other are parallel to each other, and are inclined at a predetermined angle with respect to the optical axis 17. Prism 12R and prism 1
The surfaces facing 3R are also parallel to each other, and are inclined with respect to the optical axis 17 in the opposite direction at the same angle as in the case of the prisms 12L and 13L. As a result, the prisms 12L and 12R are thicker as they are closer to the optical axis 17, and the prisms 13L and 13R are
The closer to 7, the thinner. Front lens group 11 and rear lens group 1
Reference numeral 5 denotes a lens group including a plurality of lenses, each of which is illustrated as a single lens for simplification of the drawing. Also,
For easy understanding, chromatic aberration of the lens groups 11 and 15 and the prisms 12L, 12R, 13L and 13R is not considered. That is, a lens and a prism whose chromatic aberration has been corrected are used. Further, the apparatus of the present invention is for photographing a general subject, and for easy understanding, a point light source 18a indicated by a black circle and a point light source 18 indicated by a black square are shown.
b is taken, and the case where the light from the point light source 18a is adjusted by the front lens group 11 to be parallel light is illustrated.

In FIG. 1A, the shutter 14L transmits light and the shutter 14R is in a light-shielded state. At this time,
Of the light from the point light sources 18a and 18b, the light ray 10L passes through the front lens group 11, is once bent to the optical axis side by the prism 12L, is then bent in the opposite direction by the prism 13L, and has the shutter 14L and the rear lens group. The image is taken by the imaging plate 16 after passing through 15. Other rays,
For example, the light beam 10R is not photographed because it is shielded by the shutter 14R. As a result, as shown in FIG.
An image is captured such that the point light source 18b is on the left side of the point light source 18a. This is equivalent to the left-eye image captured by the conventional stereoscopic image capturing apparatus, that is, FIG. 8B.

Next, as shown in FIG. 1C, the shutter 14L
Is a light-shielded state, and the shutter 14R is in a state of transmitting light. At this time, among the lights of the point light sources 18a and 18b, the light ray 10R is once bent to the optical axis side by the prism 12R after passing through the front lens group 11, then bent in the opposite direction by the prism 13R, and
R passes through the rear lens group 15 and is photographed by the imaging plate 16. Other light beams, for example, the light beam 10L are not photographed because they are shielded by the shutter 14L. As a result, as shown in FIG. 1D, an image in which the point light source 18b is located on the right side of the point light source 18a is captured. This is equivalent to the right-eye image captured by the conventional stereoscopic image capturing apparatus, that is, FIG. 8D.

As described above, it is possible to photograph a left-eye image and a right-eye image, that is, a stereoscopic image, as in the conventional stereoscopic image photographing apparatus. Here, the difference between the conventional stereoscopic image photographing apparatus shown in FIG. 8 and the apparatus of the first embodiment shown in FIG. 1 will be described. For comparison, the front lens groups 11 and 81 were used in both devices.
Are equal, and the distance between the front lens group 11 (81) and the subjects 18a (88a) and 18b (88b) is equal. At this time, the light beams 10L and 1 of the subject which are passed through the front lens groups of both devices and photographed by the imaging plate are taken.
0R and 80L, 80R are the same. Here, attention is paid to the size of the diameter of the rear lens unit. The rear lens group 85 of the conventional stereoscopic image photographing apparatus needs to handle light rays that are refracted by the front lens group 81 and then travel parallel to the optical axis. Therefore, the diameter of the rear lens group 85 needs to be as large as the diameter of the front lens group 81. On the other hand, in the device of the first embodiment, the light path is bent by the prisms 12L, 12R, 13L, 13R. Ray 10 corresponding to left-eye image
Considering the distance between L and the light beam corresponding to the right-eye image 10R, the light beam interval when passing through the rear lens group 15 is smaller than the light beam interval when passing through the front lens group 11. Therefore, unlike the conventional stereoscopic image photographing apparatus, it is not necessary to use the rear lens group 85 having the same diameter as the front lens group 81, and the rear lens group 15 having a smaller diameter than the front lens group 11 is used. can do. That is,
An image with a sufficient three-dimensional effect can be captured using an ordinary camera having a small portion for attaching a lens.

Next, a second embodiment of the present invention will be described. The device of the second embodiment differs from the device of the first embodiment in that FIG.
, The prisms 32L and 32R can be moved along the optical axis 37. That is,
The apparatus according to the second embodiment includes a front lens group 31 for converting light of a subject into parallel light as shown in FIG. 3, and a direction in which light 30L and 30R of the subject passing through the front lens group 31 travels along an optical axis. 37
Prisms 32L and 32R bent to the side,
L, 32R, which returns the traveling direction of the light after passing through the prism to the direction before passing through the prism.
The shutter 34 selectively selects and passes only one of the light that has passed through the prisms 33L and 33R by alternately transmitting and blocking light alternately with the light 33R over time.
L, 34R, and a rear lens group 35 for forming an image of the light passing through the shutters 34L, 34R on an imaging plate 36,
Further, a mechanism for moving the prisms 32L and 32R along the optical axis 37 is provided. In FIG. 2, the shutter 34L,
34R is drawn as a white square, which means that the shutter transmits or blocks light depending on time. There is essentially no difference from the shutters 14L and 14R in FIG.

First, the prisms 32L, R and the prism 33
The case where L and R are close will be described with reference to FIG. It is assumed that the light from the point light source 38a is adjusted by the front lens group 31 to be parallel light. In a state where light is transmitted by the shutter 34L and light is shielded by the shutter 34R, a light beam 30L indicated by a broken line in FIG.
Only N needs to be considered. At this time, the point light source 38a is photographed at the position 39a on the imaging plate 36, and the point light source 38b is photographed at the position 39bLN on the imaging plate. On the other hand, shutter 3
In a state where light is blocked by 4L and light is transmitted by the shutter 34R, only the light ray 30RN indicated by a solid line in FIG. At this time, the point light source 38a is photographed at a position 39a on the imaging plate 36, and the point light source 38b is photographed at a position 39bRN on the imaging plate. As described above, the point light source 38a captures an image at the position 39a on the imaging plate regardless of which of the two shutters 34L and 34R transmits light, whereas the point light source 38b determines which shutter transmits light. , An image is taken at a position 39bLN on the imaging plate, or an image is taken at a position 39bRN.

As shown in FIG. 3B, the prisms 32L, R
Similarly, the point light source 38a is photographed at the position 39a on the imaging plate regardless of which of the two shutters 34L, 34R transmits light, whereas the point light source 38b is Depending on which shutter transmits light, an image is taken at a position 39bLW on the imaging plate or an image is taken at a position 39bRW.

Here, the difference between the positions 39bLN and 39bRN on the imaging plate where the point light source 38b is photographed (FIG. 3 (a))
When comparing the difference between the positions 39bLW and 39bRW (FIG. 3B), the prisms 32L, R and the prisms 33L, R
Is farther, the difference in the shooting position is larger. This difference in position corresponds to the depth of the point light source 38b. That is, the farther the prisms 32L, R and the prisms 33L, R are, the more an image with a strong stereoscopic effect can be photographed. The apparatus according to the second embodiment includes prisms 32L and 32R and a prism 33.
Since the distance between L and R is configured to change continuously, the strength of the stereoscopic effect of the captured stereoscopic image can be continuously and freely adjusted. As described above, the apparatus of the second embodiment, like the apparatus of the first embodiment, can take an image with a sufficient three-dimensional effect by using an ordinary camera having a small lens mounting portion. Instead, it is possible to adjust the strength of the three-dimensional effect of the captured three-dimensional image. In the devices of the first and second embodiments, the prism 12
Although the apparatus is configured with L (32L) and 12R (32R) separated, the two prisms can be integrated and replaced with a cone prism. Further, the cone prism may be replaced with a convex lens having a thick portion near the optical axis. In the devices of the first and second embodiments, the prism 1
Although the apparatus is configured with 3L (33L) and 13R (33R) separated, the two prisms can be integrated and replaced with a cylinder with a cone prism cut out. Furthermore, a hollow cylindrical cone prism may be replaced with a concave lens having a thin optical axis.

Next, a third embodiment of the present invention will be described with reference to FIG. The device of the third embodiment is different from the device of the first embodiment in that a mirror 42 is used instead of the prisms 12L and 12R.
L and 42R are replaced by mirrors 4 instead of the prisms 13L and 13R.
3L and 43R. That is, the apparatus according to the third embodiment includes a front lens group 4 that converts the light of the subject into parallel light.
1 and light 40 of the subject passing through the front lens group 41
L, a mirror 42L that bends the direction of travel of 40R toward the optical axis 47 side.
42R and the traveling direction of the light after being reflected by the mirrors 42L and 42R is returned to the traveling direction before being reflected by the mirror.
Two mirrors 43L and 43R, and shutters 44L and 44R for selectively transmitting only one of the light reflected by the mirrors 43L and 43R by repeating transmission or blocking of light alternately with time, and the shutters. A rear lens group 45 for forming an image of the light passing through 44L and 44R on the imaging plate 46 is provided. The mirrors 42L and 42R referred to here are halved mirrors that reflect light inside the slope of the cone. The mirrors 43L and 43R referred to here are each a half of the mirror that reflects light outside the slope of the cone. Since FIG. 4 is a sectional view, each mirror 42L, 4
2R, 43L and 43R are drawn as straight lines inclined with respect to the optical axis.

In FIG. 4A, the shutter 44L transmits light and the shutter 44R is in a light-shielded state. At this time,
After passing through the front lens group 41, the light ray 40L of the light from the point light sources 48a and 48b is once bent to the optical axis side by the mirror 42L, then bent in the opposite direction by the mirror 43L, and the shutter 44L and the rear lens group. The image passes through 45 and is imaged by the imaging plate 46. Other light rays, for example, the light ray 40R are not photographed because they are shielded by the shutter 44R. As a result, as shown in FIG.
An image is captured such that the point light source 48b is on the left side of a. This is equivalent to the image for the left eye photographed by the apparatus of the first embodiment, that is, FIG. 1B.

As shown in FIG. 4C, when the shutter 44L is in a light-shielded state and the shutter 44R is in a state of transmitting light, an image as shown in FIG. Is equivalent to the image for the right eye photographed by the apparatus of the first embodiment, that is, FIG.

As described above, the device of the third embodiment is the same as that of the first embodiment.
A stereoscopic image similar to that of the device of the embodiment can be taken. As can be seen from FIG. 4, since the rear lens group 45 having a diameter smaller than the diameter of the front lens group 41 can be used, similarly to the apparatus of the first embodiment, the lens mounting portion is not large. With this camera, an image with a sufficient three-dimensional effect can be taken.

In the apparatus of the first embodiment using a prism, it is necessary to use a prism whose chromatic aberration has been corrected. In the apparatus of the third embodiment, a mirror that totally reflects light of all wavelengths is used. Therefore, there is no need to consider chromatic aberration, and the design is easy.

Next, a fourth embodiment of the present invention will be described.
The device according to the fourth embodiment differs from the device according to the third embodiment in that the mirrors 63L and 63R can be moved along the optical axis 67 as shown in FIG. That is, the apparatus according to the fourth embodiment shown in FIG. 6 includes a front lens group 61 that converts the light of the subject into parallel light, and a direction in which the lights 60L and 60R of the subject pass through the front lens group 61. Axis 6
Mirrors 62L and 62R bent to the seventh side, and the mirrors 62L and 62R
The other mirrors 63L and 63R that return the traveling direction of the light after being reflected by the mirror to the traveling direction before being reflected, and alternately transmit and block the light temporally alternately. Shutters 64L and 64R for selecting and passing only one of the reflected lights, and a rear lens group 65 for forming an image of the light passing through the shutters 64L and 64R on an imaging plate 66; 63L, 63
A mechanism for moving R along the optical axis 67 is provided. In FIG. 5, the shutters 64L and 64R are drawn as white squares, which means that the shutter transmits or blocks light depending on time. It is essentially the same as the shutters 44L and 44R in FIG.

First, the mirrors 63L and 63R and the shutter 64
The case where L and 64R are close will be described with reference to FIG. By the front lens group 61, a point light source 68
It is assumed that the light of “a” is adjusted to be parallel light. When light is transmitted by the shutter 64L and light is shielded by the shutter 64R, only the light beam 60LN indicated by a broken line in FIG. At this time, the point light source 68a is photographed at the position 69a on the imaging plate 66, and the point light source 68b is photographed at the position 69bLN on the imaging plate. On the other hand, when the light is blocked by the shutter 64L and the light is transmitted by the shutter 64R, only the light ray 60RN indicated by the solid line in FIG. At this time, the point light source 6
8a is imaged at a position 69a on the imaging plate 66, and the point light source 68b is imaged at a position 69bRN on the imaging plate. As described above, the point light source 68a is positioned at the position 69 on the imaging plate 66 regardless of which of the two shutters 64L and 64R transmits light.
a, the point light source 68b has a position 69bLN on the imaging plate depending on which shutter transmits.
, Or at the position 69bRN.

As shown in FIG. 6B, mirrors 63L, 63
The same applies to the case where R is far from the shutters 64L and 64R. The point light source 68a is photographed at the position 69a on the imaging plate regardless of which of the two shutters 64L and 64R transmits light, whereas the point light source 68b is Depending on which shutter transmits light, an image is shot at a position 69bLW on the imaging plate or at a position 69bRW.

Here, the difference between the positions 69bLN and 69bRN on the imaging plate where the point light source 68b is photographed (FIG. 6A).
And the difference between the positions 69bLW and 69bRW (FIG. 6B), the mirrors 63L and 63R and the shutters 64L and 64L are compared.
The farther the R is, the greater the difference in the shooting position is. This difference in position corresponds to the depth of the point light source 68b. That is, the farther the mirrors 63L and 63R are from the shutters 64L and 64R, the more an image with a strong three-dimensional effect can be captured. The apparatus according to the fourth embodiment includes mirrors 63L and 63R and shutters 64L and 6L.
Since the distance of 4R is configured to change continuously, the strength of the three-dimensional effect of the captured three-dimensional image can be continuously and freely adjusted. As described above, the device according to the fourth embodiment, like the device according to the third embodiment, can capture an image with a sufficient three-dimensional effect using a normal camera having a small lens mounting portion, and can be designed. In this case, it is not necessary to consider the chromatic aberration, so that not only the design is easy but also the strength of the stereoscopic effect of the stereoscopic image to be photographed can be adjusted.

As another form of the fourth embodiment, a mechanism is provided for moving the mirrors 72L, 72R perpendicularly to the optical axis 77 instead of moving the positions of the mirrors 73L, 73R as shown in FIG. May be.

In the apparatus of the first to fourth embodiments, the front lens units 11, 31, 41, 61, and 71 can change the size of the projected object without changing the focus position. It may be a zoom lens optical system. In this case, the zoom parameters (enlargement ratio of the subject) of the captured left-eye image and right-eye image are completely linked. The first
Although the embodiments of the present invention have been described in detail with reference to the fourth embodiment, the present invention is not limited to these embodiments.
It will be obvious that various modifications and changes are possible within the gist of the invention.

[0035]

As described above, according to the present invention, an ordinary camera having a small lens mounting portion is used.
An image with a sufficient three-dimensional effect can be taken. In particular, in the apparatuses according to the second and fourth embodiments, the sense of depth of the object to be photographed can be adjusted, and the degree of the stereoscopic effect can be continuously and freely adjusted.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams for explaining a first embodiment of the present invention, wherein FIG. 1A shows an optical path when a shutter 14L transmits light, FIG. 1B shows a photographed left-eye image, and FIG. FIG. 4A is an optical path when the shutter 14R transmits light, and FIG. 4D is a diagram illustrating a captured right-eye image.

FIG. 2 is a diagram for explaining a second embodiment of the present invention.

FIG. 3 is a diagram for explaining a second embodiment of the present invention, in which (a) shows prisms 32L and 32R and a prism 33;
When L and 33R are close, (b) shows the prisms 32L and 32R.
FIG. 9 is a diagram when R and prisms 33L and 33R are far from each other.

FIGS. 4A and 4B are diagrams for explaining a third embodiment of the present invention, wherein FIG. 4A illustrates an optical path when a shutter 44L transmits light, FIG. 4B illustrates a captured left-eye image, and FIG. FIG. 4B is a diagram illustrating an optical path when the shutter 44R transmits light, and FIG. 4D is a diagram illustrating a captured right-eye image.

FIG. 5 is a diagram for explaining a fourth embodiment of the present invention.

FIG. 6 is a diagram for explaining a fourth embodiment of the present invention, wherein (a) shows mirrors 63L and 63R and shutters 64L and 64;
If R is close, (b) shows mirrors 63L and 63R and shutter 6
Diagram when 4L and 64R are far away.

FIG. 7 is a diagram for explaining another embodiment of the fourth embodiment of the present invention.

8A and 8B are diagrams for explaining a conventional stereoscopic image photographing apparatus, wherein FIG. 8A shows an optical path when a shutter 84L transmits light, FIG. 8B shows a photographed image for the left eye, and FIG. 84R is an optical path in the case of transmitting light, and (d) is a diagram showing a captured right-eye image.

[Explanation of symbols]

11, 31, 41, 61, 71, 81 Front lens group 12L (R), 13L (R), 32L (R), 33L
(R) Prisms for left (right) eye rays 42L (R), 43L (R), 62L (R), 63L, respectively
(R), 72L (R), 73L (R) Mirrors for left (right) eye rays 14L (R), 34L (R), 44L (R), 64L
(R), 74L (R), 84L (R) Shutters for left (right) eye rays 15, 35, 45, 65, 75, 85 Rear lens group 16, 36, 46, 66, 76, 86 Board

Continued on the front page (72) Inventor Mitsuho Yamada 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Inside the Broadcasting Research Institute (72) Inventor Fumio Okano 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan F-Term (in reference) 2H059 AA03 AA12

Claims (8)

[Claims] A first optical element for converting light of a subject into parallel light; a second optical element for forming an image of the parallel light on an image pickup plate; and a first optical element between the first and second optical elements. A plurality of mechanical or electronic shutters that open and close sequentially in time;
In the three-dimensional image photographing apparatus, the apparatus is located between the first optical element and the plurality of shutters, and the direction in which the light of the subject travels is on the optical axis side of the first and second optical elements. A first beam path changing unit that bends; and a second beam path changing unit that returns the direction of the light beam bent by the first beam path changing unit to the direction before bending. 3D image capturing device. 2. The apparatus according to claim 1, wherein the first
The three-dimensional image photographing apparatus, wherein the second ray trajectory changing means is an optical prism. 3. The apparatus according to claim 1, wherein the first
The three-dimensional image photographing apparatus, wherein the second ray trajectory changing means is a mirror. 4. The apparatus according to claim 1, wherein the apparatus has a mechanism for adjusting a distance between the first ray trajectory changing means and the second ray trajectory changing means. A stereoscopic image photographing device characterized by the above-mentioned. 5. The apparatus according to claim 4, wherein the mechanism for adjusting the distance moves an optical prism, which is a first ray trajectory changing means, along an optical axis of the first and second optical elements. A stereoscopic image photographing device characterized by being a mechanism. 6. The apparatus according to claim 4, wherein the mechanism for adjusting the distance moves a mirror, which is a second ray trajectory changing means, along the optical axis of the first and second optical elements. A three-dimensional image photographing apparatus, characterized in that: 7. The three-dimensional image photographing apparatus according to claim 4, wherein the mechanism for adjusting the distance vertically moves a mirror, which is a first ray trajectory changing means, to an optical axis of the first and second optical elements. A three-dimensional image photographing device, which is a mechanism for moving. 8. The apparatus according to claim 1, wherein the first optical element is a zoom lens optical system capable of changing a size of an object to be photographed without changing a focus position. A stereoscopic image photographing apparatus characterized by the above-mentioned.