JP3253420B2 - Stereo photography equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a stereo photographing apparatus 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. Focused on the subject 3 by the left lens 2, film, CCD (Charge Coupled Dev)
A subject image 6 is formed on imaging 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. Then, if the left and right subject images captured at different angles are viewed by overlapping with the left and right eyes, the subject 3 can be observed as a three-dimensional image.

[0003]

However, in the conventional stereo photographing apparatus, the left and right lenses 1 and 2 are used as described above.
Are arranged in parallel, and when the subject 3 to be photographed is at a short distance, as shown in FIG. 6, the subject image 6 is shifted toward the outer end. That is, since the right lens 1 and the left lens 2 are arranged at a predetermined interval, the subject image 6 is shifted to the right in the right lens 1 and to the left in the left lens 2, and the left and right images overlap 100.
Becomes smaller. Therefore, the subject region that can be stereoscopically viewed becomes narrow, and a good stereoscopic image cannot be obtained. In addition, since the light beam from the subject 3 is obliquely incident on the right lens 1 and the left lens 2, a geometrical shape such that the circular subject 3 becomes elliptical as shown in the subject image 6 in FIG. There is a problem that a large distortion occurs.

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. The one in which the deflection lens systems 9 and 10 are arranged is used. It should be noted that a mirror, a wedge prism, or the like can be used instead of the deflection lens systems 9 and 10. According to this, the eccentric lens system 9, 1
If the respective cylindrical lenses La of 0 are shaken outward according to the distance, the principal rays of the left and right lenses 7 and 8 are directed to the center of the subject 3, thereby reducing the above-mentioned subject area and geometrically. The distortion is eliminated. However, in this case, as described above, a mechanism for driving the two left and right lenses 7 and 8 for focusing and a mechanism for driving the cylindrical lens La in accordance with the distance in the deflection lens systems 9 and 10. Two mechanisms are required, resulting in a problem that the configuration becomes complicated and the device becomes large.

Further, as shown in FIGS. 6 and 7, in a stereo photographing apparatus, two left and right lens members and image pickup members 4 and 5 such as CCDs are used to obtain left and right subject images.
It is necessary to match the imaging characteristics of the two members, that is, the sensitivity, the color reproducibility, and the like.

The present invention has been made in view of the above problems, and a first object of the present invention is to provide a stereo image pickup apparatus capable of obtaining left and right object images with a simplified configuration. It is an object of the present invention to provide a stereo photographing apparatus capable of achieving the above-mentioned first object after eliminating a reduction in a subject area and geometric distortion by a simple mechanism.

[0007]

To achieve the above object, according to the Invention The stereo imaging apparatus according to the first aspect, the binding of the subject
One system of a front optical system and a rear optical system for imaging,
The disposed for lateral movement between the front optics and the rear optical system, the right object image light viewed object from the right side when the right move, whereas the left the viewed object from the left side when the left move <br The prism body configured to guide the image light to the rear optical system, and the right and left objects emitted from the rear optical system.
An imaging member for imaging a body image to form a three-dimensional image . According to a second aspect of the present invention, the front optical system includes a positive lens and a negative lens combined, and the principal ray of the imaging optical system when the prism body moves right or left is at a finite distance. A positive / negative combination lens system configured to face the center.

[0008]

According to the first aspect of the present invention, when the prism body composed of, for example, a pechan prism (dach prism) is moved to the right by a predetermined amount, the image light of the object viewed from the right side of the object has a direction of emission. The light is shifted by the prism body and guided to the imaging member at the center. On the other hand, when the prism body moves to the left by a predetermined amount, the object image light viewed from the left is shifted in its emission direction and guided to the same imaging member. Therefore, by shaking the prism body left and right, the left and right subject images can be formed on one system of imaging member.

According to the second aspect of the present invention, the principal ray of the imaging lens system for capturing the left and right subject images is directed to the center of the subject at a finite distance by the function of combining the positive lens and the negative lens. In this state, the subject image existing at the center of the visual field 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 deflection function can be performed by one mechanism.

[0010]

FIG. 1 shows a schematic configuration of a stereo photographing apparatus according to an embodiment. The figure shows a state in which a subject at infinity is focused. In the figure, imaging (recording)
CCD (other films may be used) 12 as a member
The rear optical system (lens) 13 is arranged in a fixed state at the front stage of the above, and these are provided one by one. A positive / negative combination lens system 14 as a front optical system is mounted in front of the rear optical system 13, and the positive / negative combination lens system 14 is a positive lens 15 composed of at least a convex lens arranged on the subject (object) side. And a negative lens 16 formed of a concave lens disposed on the image side. In the embodiment, the positive lens 15 (or the negative lens 16) can be moved back and forth for focusing. Of course, the positive and negative lenses 15 and 16 can be set in a fixed state to focus on a predetermined distance range.

In the embodiment, the rear optical system 13 is used.
A prism body 18 composed of a Pechan prism is provided between the positive and negative combination lens system 14. The prism body 18 is a combination of two roof prisms as shown in the figure. As shown in FIG. 2, light 201 incident on the central point O1 of the incident surface exits from the central point O2 of the exit surface. The light 202 incident from a position away from the center point O1 on the right side by L1 from the center point O1 of the incident surface is shifted from the center point O2 to the left side by L1 on the outgoing surface, and exits from the center point O1 on the left side to L1 on the left side. Incident from a distance 2
Reference numeral 03 denotes a light-emitting surface which is shifted rightward from the center point O2 by L1 to emit light. According to this prism body 18, when the incident image is an erect image, the output image is a 180 ° rotationally symmetric image.

Therefore, as shown in FIG. 1B, the right-side subject image light 204 is transmitted to the positive / negative combination lens system 14 and the rear side.
When the light enters from a place separated by a length L2 to the right from the optical axis 300 of the side optical system 13, the prism body 18 is moved to the right by a length L1 (2 × L1 = L2) which is half of the length L2. Then, the right-side subject image light 204 is transmitted to the rear optical system 13.
Can lead to Similarly, as shown in FIG. 1C, in the case of the subject image light 205 on the left side, the length L2 is moved from the optical axis 300 to the left by the length L1.
The left subject image light 205 that enters from a position
The light can be guided to the rear optical system 13.

When the object is at infinity, the positive / negative combination lens system 14 is arranged as shown in FIG.
As shown in (1), by moving the positive lens 15 forward, focusing can be performed at a finite distance. In this case, focusing can be performed well even at a short distance. The positive / negative combination lens system 14
When the image is captured from different angles, the right and left object image light coincide with the principal ray of the rear optical system 13.

That is, FIG. 4 shows a state in which the positive / negative combination lens system 14 is disposed in front of the left and right imaging lenses 1 and 2 used in the prior art (FIG. 1). When viewed in the opposite direction, the principal rays 301 and 302 of the imaging lenses 1 and 2 shown in FIG.
And crosses at the center of the subject 3 at a predetermined distance. Therefore, when the subject 3 is viewed from different angles, the left and right subject image light coincides with the principal rays of the imaging lenses 1 and 2, and the imaging members of the imaging members disposed downstream of the imaging lenses 1 and 2. The subject 3 can be imaged at the center position.

According to the positive / negative combination lens system 14, the rear
In addition to the above-described declination function for directing the principal ray of the side optical system 13 to the subject 3, the lens has a function of focusing on the subject 3, and there is an advantage that both functions can be realized by one mechanism. . So to, in the embodiment, by providing the prism body 18, after one the imaging lenses 1 and 2
The side optical system 13 can be used, 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 obtains left and right object image light constituting 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 is increased.
The right-side subject image light 204 that enters from a position separated by a distance L2 from is guided to the rear optical system 13, so that the subject image is formed on the CCD 12. 1C, when the prism 18 is moved to the left by the length L1, the subject image light 205 on the left is similarly guided to the CCD 12 via the same rear optical system 13. For example, when the subject 3 arranged at 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. Accordingly, unlike the related art, the subject area does not decrease, and the distortion of the subject is also eliminated. Moreover, according to the embodiment, the left and right subject images can be obtained by one CCD 12 simply by moving the prism body 18 to the left and right, and the subject images are observed as a three-dimensional image by displaying them on two monitors, for example. be able to.

In the above embodiment, an example in which a pechan prism is used as the prism body 18 has been described. However, the prism body 18 can be another prism capable of shifting incident light by a predetermined amount and emitting the light. . In the above embodiment, the positive / negative combination lens system 14 is used as the front optical system.
However, it is also possible to use a conventional configuration as shown in FIG.

[0018]

As described above, according to the first aspect of the present invention, the optical system is disposed between the front optical system and the rear optical system so as to be movable left and right, and when moved to the right, it is captured from the right side. Since the subject image light, or the object image light captured from the left side when it is moved to the left, is provided with a prism that is configured to be guided to the rear optical system, only one system of imaging optical system and imaging member is required. The left and right subject images can be obtained with a simplified configuration.

According to the second aspect of the present invention, the positive lens and the negative lens are combined, and the prism body moves left and right.
Was negative combination lens system the chief ray of the imaging optical system is constructed as toward the center of the object at a finite distance at the front
Since it is used as a side optical system, a single mechanism realizes the focusing function and the deflection angle function, thereby simplifying the imaging optical system and the imaging member while reducing the object area and eliminating geometric distortion. There is an advantage that can be.

[Brief description of the drawings]

FIG. 1 is a top view showing a schematic configuration of a stereo photographing apparatus according to an embodiment of the present invention. FIG. 1 (A) is a diagram showing a state where a prism body is arranged at a center position at infinity, and FIG.
Is a diagram illustrating a state in which the prism body is moved to the right by a predetermined amount, and FIG. 10C is a diagram illustrating a state in which the prism body is moved to the left by a predetermined amount.

FIG. 2 is a diagram illustrating a trajectory of a light beam on a prism body according to an embodiment.

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

FIG. 4 is a diagram illustrating a locus of a principal ray of a left and right imaging lens.

FIG. 5 is a diagram illustrating an image forming state in the embodiment.

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 provided with a deflection lens system.

[Explanation of symbols]

1,7… right lens, 2,8… left lens, 3
… Subject, 12… CCD, 13… rear optical system, 14… positive and negative combination lens system (front optical system) , 1
5: Positive lens, 16: Negative lens, 18: Prism.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 3/00-3/12 G03B 35/00-35/26 G02B 7/02-7/16

Claims (2)

(57) [Claims] 1. A front side of one system for forming an image of a subject
An optical system and a rear-side optical system, disposed for lateral movement between the front optics and the rear optical system, an object when the right object image light, whereas the left moving viewed object from the right side when the right move And a prism body configured so that left-side object image light viewed from the left side is guided to the rear optical system, and left and right object images emitted from the rear optical system.
A stereoscopic imaging device comprising: 2. The front optical system is a combination of a positive lens and a negative lens, and the principal ray of the imaging optical system when the prism moves right or left is directed to the center of the subject at a finite distance. 3. The stereo photographing apparatus according to claim 1, wherein the positive / negative combination lens system is configured as described above.