JPH06332086A - Stereo-photographic device - Google Patents

Abstract

PURPOSE:To obtain a left and a right subject image by an image pickup member, etc., of one system and to eliminate both a decrease of a subject area and geometrical distortion by a simple mechanism. CONSTITUTION:This device has a positive-negative combination lens system 14 which combines a positive lens 15 with a negative lens 16 and acquires a body from a left and a right different angle direction, an image formation optical system 13 of one system arranged on front stage of a CCD 12, and a prism body 18 which is arranged between the image formation optical system 13 and positive-negative combination lens system 14 movably to the left and right. This prism body 18 guides subject image light acquired from the right side at the time of right movement or subject image light acquired from the left at the time of left movement to the image formation optical system while shifting its direction. Therefore. the left and right subject images can be picked up by the image formation optical system 13 of one system and the CCD 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a stereoscopic photographing device for stereoscopically viewing a subject.

[0002]

2. Description of the Related Art A stereo photographing apparatus for observing a subject as a three-dimensional image is well known. In this stereo photographing apparatus, as shown in FIG. Focusing on the subject 3 by the left lens 2, film, CCD (Charge Coupled Dev
A subject image 6 is formed on image pickup members 4 and 5 such as ice.
According to this, the subject 3 is captured by the left and right lenses 1 and 2 at different angles, and the left and right subject images 6 forming a stereo image are captured by the imaging members 4 and 5. When the left and right subject images captured at different angles are overlapped by the left and right eyes, the subject 3 can be observed as a stereoscopic image.

[0003]

However, in the conventional stereo photographing apparatus, as described above, the left and right lenses 1 and 2 are used.
And the subject 3 to be photographed is in a short distance, the subject image 6 approaches the outer end as shown in FIG. That is, since the right lens 1 and the left lens 2 are arranged at a predetermined interval, the subject image 6 shifts to the right side of the right lens 1 and to the left side of the left lens 2, and a range 100 where the left and right images overlap each other.
Becomes smaller. Therefore, the subject area that can be stereoscopically viewed is narrowed, and a good stereoscopic image cannot be obtained. Further, since the light rays from the subject 3 are obliquely incident on the right lens 1 and the left lens 2, as shown in the subject image 6 of FIG. 6, the geometrical shape such that the circular subject 3 becomes elliptical. There is a problem that various distortions occur.

Therefore, conventionally, as shown in FIG.
A cylindrical lens La and a fixed lens Lb which can be swung in the left and right direction are provided in front of the left and right lenses 7 and 8 which are provided at the left and right positions and can be moved back and forth for focusing, and act as a declination prism. The one in which the declination lens systems 9 and 10 are arranged is used. A mirror, a wedge prism, or the like can be used instead of the declination lens systems 9 and 10. According to this, the deviation angle lens systems 9 and 1
When the respective cylindrical lenses La of 0 are swung outward according to the distance, the chief rays of the left and right lenses 7 and 8 are directed to the center of the subject 3, which reduces the subject area and reduces the geometrical area. Distortion is eliminated. However, in this case, the mechanism for driving the left and right lenses 7 and 8 of the two systems for focusing as described above and the mechanism for driving the cylindrical lens La in the declination lens systems 9 and 10 according to the distance. There is a problem that two mechanisms are required, the configuration becomes complicated, and at the same time, the device becomes large.

Further, as shown in FIG. 6 and FIG. 7, in the stereo photographing device, in order to obtain left and right subject images, left and right system lens members and image pickup members 4 and 5 such as CCDs.
However, there is a problem in that the imaging characteristics of the two members, that is, the sensitivity, color reproducibility, and the like need to be the same, which is wasteful in terms of configuration.

The present invention has been made in view of the above problems. A first object of the present invention is to provide a stereo image pickup device capable of obtaining left and right subject images with a simplified structure. It is an object of the present invention to provide a stereoscopic imaging apparatus capable of achieving the first object while eliminating the reduction of the subject area and the geometrical distortion with a simple mechanism.

[0007]

In order to achieve the above object, a stereoscopic image pickup apparatus according to a first aspect of the present invention comprises a stereoscopic optical system for capturing an object from different left and right angles and a left and right stereoscopic image forming a stereoscopic image. An image pickup member of one system for picking up a subject image, and a left and right movable image pickup member disposed between the image pickup member and the stereo optical system. In this case, the left-side object image light is shifted in direction and guided to the imaging optical system. According to a second aspect of the present invention, in the stereo optical system, a positive lens and a negative lens are combined, and the principal ray of the imaging optical system when the prism body is moved to the right or left is an object whose finite distance is finite. It is characterized in that it is a positive / negative combination lens system configured to face the center of.

[0008]

According to the structure of the first claim, when the prism body formed of, for example, a Pechan prism (Dach prism) is moved to the right by a predetermined amount, the image light of the object seen from the right side has It is shifted by the prism body and guided to the image pickup member in the center. On the other hand, when the prism body moves to the left side by a predetermined amount, the emission direction of the subject image light seen from the left side is shifted and is guided to the same imaging member. Therefore, by swinging the prism body to the left and right, the left and right subject images can be formed on the image pickup member of one system.

According to the structure of the second aspect, the chief ray of the imaging lens system when capturing the left and right subject images is directed to the subject center at a finite distance by the combined function of the positive lens and the negative lens. The subject image existing in the center of the field of view is guided to the center of the image plane of the left and right lenses. Therefore, the reduction of the subject area and the geometric distortion are eliminated, and both the focusing function and the declination function can be performed by one mechanism.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic configuration of a stereo image pickup apparatus according to an embodiment, and the drawing shows a state in which an object at infinity is focused. In the figure, imaging (recording)
CCD as a member (other film may be used) 12
The imaging optical system (lens) 13 is arranged in a fixed state in the preceding stage, and these are provided one by one. A positive / negative combination lens system 14 as a stereo optical system is attached in front of the imaging optical system 13, and the positive / negative combination lens system 14 is a positive lens 15 composed of a convex lens arranged at least on the object (object) side. And a negative lens 16 composed of a concave lens disposed on the image side. In the embodiment, the positive lens 15 (or the negative lens 16 may be moved) can be moved back and forth for focusing. of course,
It is also possible to fix the positive and negative lenses 15 and 16 in a fixed state so that the positive and negative lenses 15 and 16 are focused on a predetermined distance range.

In the embodiment, the image forming optical system 13 is used.
Between the positive and negative combination lens system 14, a prism body 18 made of a Pechan prism is provided. This prism body 18 is a combination of two roof prisms as shown in the drawing. As shown in FIG. 2, the light 201 incident on the center point O1 of the incident surface is emitted from the center point O2 of the emitting surface. , The light 202 incident from a position L1 to the right from the center point O1 of the incident surface shifts to the left by L1 from the center point O2 on the exit surface, and emerges from the center point O1 of the incident surface to the left L1. 2 incident light from a distance
On the emitting surface, reference numeral 03 is configured to shift rightward from the center point O2 by L1 and emit. According to the prism body 18, when the incident image is an erect image, the output image is a 180 ° rotationally symmetrical image.

Therefore, as shown in FIG. 1B, the object image light 204 on the right side is incident from a position separated by a length L2 from the optical axis 300 of the positive / negative combination lens system 14 and the imaging optical system 13 to the right side. In this case, if the prism body 18 is moved to the right by a length L1 (2 × L1 = L2) which is half the length L2, the object image light 204 on the right side is formed into the image forming optical system 13.
Can lead to. Similarly, as shown in FIG. 1C, also in the case of the subject image light 205 on the left side, the length L2 can be changed by moving it from the optical axis 300 to the left side by the length L1.
It is possible to guide the subject image light 205 on the left side, which is incident from a position distant by only, to the imaging optical system 13.

Further, the positive / negative combination lens system 14 has the arrangement shown in FIG. 1 when the subject is at infinity.
As shown in (1), by moving the positive lens 15 forward, focusing can be performed at a finite distance, and in this case, focusing can also be performed satisfactorily particularly at a short distance. The positive / negative combination lens system 14 is used for the subject 3
And the left and right object image lights when they are captured from different angles with the chief rays of the left and right imaging optical systems 13.

That is, FIG. 4 shows a state in which the positive / negative combination lens system 14 is arranged in front of the left and right imaging lenses 1 and 2 used in the prior art (FIG. 1). When considered in the opposite direction, the principal rays 301 and 302 of the imaging lenses 1 and 2 in the figure are the negative lens 16 and the positive lens 15 respectively.
And crosses at the center of the subject 3 at a predetermined distance. Therefore, the left and right subject image lights when the subject 3 is viewed from different angles coincide with the chief rays of the imaging lenses 1 and 2, and the image pickup members disposed in the subsequent stages of the imaging lenses 1 and 2 are in contact with each other. The subject 3 can be imaged at the center position.

The positive / negative combination lens system 14 has a function of focusing on the subject 3 in addition to the above-described declination function of directing the chief ray of the imaging lens system 13 to the subject 3. There is an advantage that both functions can be realized by one mechanism. Then, and in the embodiment, by providing the prism body 18, the imaging lenses 1 and 2 described above are provided.
Can be replaced with one imaging optical system 13, and the left and right subject images can be captured by one CCD 12.

As described above, according to the configuration of the above embodiment, as shown in FIG. 4, the positive / negative combination lens system 1 is used.
4 obtains left and right object image lights forming a stereoscopic image. At this time, as shown in FIG. 1B, when the prism body 18 is moved rightward by the length L1, the optical axis 300
Since the subject image light 204 on the right side that is incident from a position separated by a length L2 from is guided to the imaging optical system 13, the subject image is formed on the CCD 12. Further, as shown in FIG. 1C, when the prism body 18 is moved to the left by the length L1, the left-side subject image light 205 is similarly guided to the CCD 12 via the same image forming optical system 13. For example, when the subject 3 arranged in the center of the photographing area is circular, a circular subject image 60 is formed at the center of the CCD 12 in the embodiment as shown in FIG. Therefore, the subject area is not reduced as in the conventional case, and the subject distortion is eliminated. Moreover, according to the embodiment, the left and right subject images can be obtained by one CCD 12 only by moving the prism body 18 to the left and right, and the subject images are observed as a stereoscopic image by displaying them on, for example, two monitors. be able to.

In the above embodiment, the Pechan prism is used as the prism body 18, but the prism body 18 may be another prism capable of shifting the incident light by a predetermined amount and emitting it. . Although the positive / negative combination lens system 14 is used as the stereo optical system in the above-described embodiment, the conventional configuration as shown in FIG. 7 can be used.

[0018]

As described above, according to the first aspect of the invention, the object image is arranged between the image pickup member and the stereo optical system so as to be movable left and right, and when moved rightward, the subject image captured from the right side is obtained. On the other hand, since the prism body is provided so that the light, on the other hand, the object image light captured from the left side when being moved to the left is guided to the image forming optical system by shifting the direction, It is possible to obtain the left and right subject images with a simplified system.

According to the second aspect of the present invention, a positive / negative combination lens system in which a positive lens and a negative lens are combined so that the chief rays of the left and right lenses are directed toward the center of an object at a finite distance, Since it is used as a stereo optical system, it realizes a focusing function and a declination function by one mechanism, which simplifies the above-mentioned imaging optical system and imaging member while eliminating the subject area and geometric distortion. There is an advantage that can be done.

[Brief description of drawings]

FIG. 1 is a top view showing a schematic configuration of a stereo image pickup apparatus according to an embodiment of the present invention, and FIG. 1A is a view showing a state where a prism body is arranged at a central position at infinity, and FIG.
FIG. 6 is a diagram showing a state where the prism body is moved to the right by a predetermined amount, and FIG. 6C is a diagram showing a state where the prism body is moved to the left by a predetermined amount.

FIG. 2 is a diagram showing a locus of light rays in a prism body of an example.

FIG. 3 is a top view showing a state in which the device of the embodiment is adjusted to a finite distance.

FIG. 4 is a diagram showing trajectories of chief rays of left and right imaging lenses.

FIG. 5 is a diagram showing an image formation state in the example.

FIG. 6 is a diagram showing a schematic configuration of a conventional stereo photographing apparatus and an image forming state thereof.

FIG. 7 is a top view showing a schematic configuration of a conventional device having a deviation lens system.

[Explanation of symbols]

 1, 7 ... Right lens, 2, 8 ... Left lens, 3 ... Subject, 12 ... CCD, 13 ... Imaging optical system, 14 ... Positive / negative combination lens system, 15 ... Positive lens, 16 ... Negative lens, 18 ... Prism body .

Claims (2)

[Claims] 1. A stereo optical system for capturing a subject from different left and right angles, an image pickup member of one system for picking up left and right subject images forming a stereoscopic image, and the image pickup member and the stereo optical system. It is arranged so that it can move left and right between
Stereo imaging consisting of a prism body configured to shift the direction of the right-side object image light when moved to the right and to the left-side object image light when moved to the left, and to be guided to the imaging optical system. apparatus. 2. The stereo optical system is a combination of a positive lens and a negative lens, and when the prism body moves to the right or left, the chief ray of the imaging optical system is directed to the center of an object at a finite distance. The stereo image pickup apparatus according to claim 1, wherein the positive and negative combination lens system is configured as described above.