JP2001075046A - Stereoscopic vision system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a small adapter which is mounted to a normal zoom camera for photographing a stereoscopic picture by using an optical system constituting a stereoscopic unit picture of optical axis conversion which has a pair of concave lenses at an objective input part and whose output part is connected with a telephoto lens picture inputting optical system. SOLUTION: Respective left/right input pictures L and R are taken by objective concave lenses L1L and L1R, and enter the zoom optical system Z1 of a camera 31 through reflecting mirror pair optical systems M1L, M2L and M1R, M2R being optical axis converting optical system consisting of objective side reflecting mirrors M1L, M1R and eye piece side reflecting mirrors M2L, M2R to constitute a stereoscopic unit picture 41 on a camera picture receiving surface. Then, the optical axis of an inputted picture is moved by bL and bR in a horizontal direction by these left and right pair of reflecting mirrors to realize a stereoscopic gap (b8 of left/right stereoscopic pictures as their sums bL+bR. By using this optical system constituting stereoscopic unit picture, a small adapter which is mounted to a normal zoom camera for photographing a stereoscopic picture is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration system of a stereoscopic vision system.

[0002]

2. Description of the Related Art Conventionally, there is a stereoscopic viewing system in which both stereoscopic screens from a position left and right separated by a distance corresponding to stereoscopic parallax are arranged vertically and horizontally and formed as one stereoscopic unit screen and displayed. In this system, there is a method of using an adapter to form a stereoscopic unit screen by moving the optical axis of each screen by combining two reflecting mirrors for each of the left and right screens as stereoscopic image input means. Was used. In this stereoscopic vision system, stereoscopic vision is achieved by superimposing both left and right screens arranged on a display screen through an observation optical system that refracts the optical axis.

[0003]

However, in a stereoscopic system using a stereoscopic unit screen, when implementing an adapter using a pair of reflecting mirrors constituting the stereoscopic unit screen, both left and right screens corresponding to the input units are input. From the objective-side reflecting mirror to the position of the image input lens of the camera, which is an output unit that outputs these images to the camera as a unit screen by combining these screens with the eyepiece-side reflecting mirror, A certain interval for configuring the adapter optical system, such as a distance corresponding to the parallax interval and a space for installing these reflecting mirror optical systems, is required. Along with this, in order to secure this interval according to the spread of the angle of the screen, it is particularly necessary to greatly increase the area of the outermost objective-side reflecting mirror. In particular, when trying to make the screen wide horizontally like a panoramic screen, the screen rapidly expands with an increase in the interval, so an extremely large area is required as the objective-side reflecting mirror. When trying to configure an optical system, particularly in the case of a panoramic screen, the configuration has been very large and impractical. On the other hand, when the left and right three-dimensional screens arranged on the three-dimensional unit screen are superimposed and stereoscopically viewed, the edges of both screens enter each other at the boundary surface of these two screens, resulting in a blurred area, Not only was it impossible to superimpose the images, but when the images were further superimposed, unnecessary screens were mixed into the images, making clear stereoscopic vision impossible. An object of the present invention is to eliminate these drawbacks and to realize a stereoscopic vision system using a compact and compact stereoscopic unit screen constituting optical system and an observation optical system which enables clear stereoscopic vision.

[0004]

In order to achieve these objects, the present invention first provides a unit screen utilizing a combination of an objective concave lens and a narrow-angle telephoto lens function generally provided in a camera for inputting an image. The constituent optical system was realized.
That is, in order to make this optical system compact, the angle of view is set to be small like a telephoto lens, so that even if the interval required for installing the reflecting mirror optical system is set, the screen spreads in this space. The goal was to minimize as much as possible. A general video camera or the like to which the present invention is applied often uses a zoom optical system. In these cameras, a telephoto screen can be easily obtained by zooming together with a wide-angle screen. In addition, it generally enables a considerably narrow angle of view (strong telephoto), and is very suitable for this purpose. However, this is the opposite of the case where a wide-angle panoramic screen is required as described above, so that a stereoscopic screen with a very narrow angle of view can be obtained as it is if a compact configuration is used as it is. Will be gone.

For this reason, in the present invention, a wide-angle screen to be finally obtained is first converted into a compressed screen having a narrow angle of view by an objective concave lens, and this compressed screen is converted into an optical system having a narrow angle of view of a camera telephoto lens optical system. Thus, the function of finally obtaining the input image of the original wide-angle screen was realized by inputting an image with the. By using the telephoto lens function of the zoom lens optical system, which is a general function of the camera, the size of the reflector of the optical system has been increased in the case of forming a panoramic three-dimensional screen that has spread horizontally in the past. It was possible to realize a stereoscopic unit screen configuration optical system that can be obtained with a remarkably compact and compact reflecting mirror optical system and a necessary wide-angle input screen, instead of the stereoscopic unit screen configuration optical system that was a concern that . A wide-angle attachment that is mounted in front of a camera optical system to obtain a wide-angle screen has been well known. However, this is merely an attachment lens that shortens the focal length of the optical system of the original camera equivalently, and as in the present invention, the narrow space of the camera to secure the space for setting the reflecting mirror optical system. The purpose and principle are completely different from the case where the objective concave lens is attached to utilize the telephoto lens function of the angle of view, complement it, and finally provide a wide-angle screen.

On the other hand, in a stereoscopic system having a stereoscopic unit screen configuration, for example, in the case of a vertical arrangement system, upper and lower screens displayed on a stereoscopic display surface are superimposed by an observation optical system and stereoscopically viewed. When viewed from the left and right eyes, it is desirable that the portions other than the portions corresponding to the left and right screens be completely shielded. As for the peripheral portion of the display screen, the display screen itself is originally bordered and has a mask function, so that there is not much problem. However, in particular, as for the boundary portion between the stereoscopic screens at the center of the unit screen, the more the boundary is to be clearly defined, the more accurately the two need to be masked and must be clearly defined. However, when attempting to optically configure a unit screen, for example, in the case of a vertical configuration, since the optical systems of the two-dimensional screens arranged vertically overlap each other, the two screens generally permeate each other, resulting in blurred waste. In many cases, a sharp boundary portion is formed, and in practice, it is very difficult to clearly mask. For this,
If a fixed width area is forcibly set as a blank area for both screen boundary areas on the three-dimensional unit screen, the unclear area where the edges are blurred and the two screens are mixed is masked by this, and the area on both the left and right screens is masked. Are clearly framed, so that the superimposing operation on the left and right screens can be facilitated. On the other hand, a shielding plate may be provided in the stereoscopic observation optical system to mask unnecessary parts on the screen, but since this shielding plate is located near the eyes, the edge to be masked is inevitably blurred. Had been lost. However, even in this case, the mask area is clearly bordered in advance by the blank area in an amount corresponding to the blank area, so that the effect of the blur can be eliminated and a clear mask can be very easily formed. This makes it very easy to perform stereoscopic observation. Further, this blank portion can be used as a storage area for image-related information such as control data.

Further, in this case, if the field of view of the upper end or the lower end corresponding to the outer edge of each of the upper and lower screens is made slightly larger than the corresponding field of view of the other screen, the upper and lower ends of the superimposed screens can be adjusted. Although a part of the screen becomes a planar image, the main part of the screen becomes a three-dimensional image except for the upper and lower ends corresponding to the outer edges of the screen as a whole. As a result, it is possible to realize a stereoscopic view in which the screen is widened as a whole without substantially impairing the stereoscopic effect.

When the stereoscopic unit screen displayed on the display screen is stereoscopically viewed through the observation optical system, unnecessary three-dimensional unit screens including the boundary between the two screens on the stereoscopic unit screen viewed from the right and left eyes on the display surface. By masking the screen portions with shielding plates provided in pairs in the observation optical system, clearer stereoscopic vision is realized. However, the observation optical system equipped with this shielding plate is generally located close to the eye, especially in the past because this shielding plate was closely attached to the eye such as directly attached to the upper or lower side of the lens or prism of the observation optical system ,
The mask image was out of focus during observation because it was too close. For this reason, the side portions of the shielding plate serving as a mask are also blurred, and only a blurry and incomplete masking can be performed. Therefore, in the observation optical system of the present invention, the configuration in which the shielding plate is installed at a position away from the eyes enables the blur at the boundary portion to be masked to be significantly reduced. is there. Furthermore, by making one or both of the two shielding plates having a variable structure to mask the boundary between the two screens on the three-dimensional unit screen, the angle of view of the three-dimensional screen to be observed in the stereoscopic observation with the observation optical system. By moving this shield plate and adjusting the masked surface corresponding to
The 3D image clearly superimposed can be observed. In this case, one of the shielding plates is fixed,
By making only the other shield plate variable, it is possible to match the three-dimensional screen.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described based on examples with reference to the drawings. FIG. 7 shows the operation principle of the stereoscopic unit screen constituting optical system of the present invention. First, as shown in FIG. 7A, in this optical system, the input screen A of the angle of view w1 entering the objective concave lens L1 is compressed to the angle of view w2 by the concave lens L1. Here, when this angle of view w2 is matched with the angle of view of the zoom telephoto screen of the camera optical system Z1 which is the image input optical system to be mounted, the light reception image G of this input screen when viewed from the camera is exactly This is equivalent to the received light image GI corresponding to the case where the screen of the angle of view w1 is directly input. Therefore, by configuring this optical system, the objective lens L1 and the camera optical system can be input to the objective concave lens in a state of a narrow angle of view w2 that suppresses the spread of the screen while equivalently inputting an image with a wide angle of view w1. Lens Z1
Enabled to secure a space of distance x between
That is, as shown in FIG. 7B, within the distance x secured by the present configuration, the objective-side reflecting mirror M1 and the eyepiece-side reflecting mirror M
According to 2, it becomes possible to configure the reflecting mirror pair optical systems M1 and M2 for performing the optical axis movement for securing the three-dimensional space between the left and right three-dimensional screens. In this case, input wide-angle screen without concave lens
If an attempt is made to construct a reflecting mirror optical system by directly taking the space of the distance x with respect to w1, a reflecting mirror having a large area is required to cover the widening of the angle of view. Was. In this case, the angle of view of the camera optical system Z1 does not necessarily have to match the angle of view w2, but if an attempt is made to obtain a narrower angle of view in order to further suppress the enlargement of the screen and obtain a long distance x, the angle of view on the objective screen is reduced. The angle of view that is trying to capture is also narrowed. In addition, the zoom optical system of the camera is particularly suitable for realizing the configuration of the present invention, especially in the case of a video camera, since the zoom telephoto magnification is generally high and a very narrow angle of view can be easily obtained. Further, since the angle of view w2 can be freely changed by the zoom operation, the degree of freedom in setting the combination of the angle of view w1 of the input screen and the objective concave lens is very high.

FIG. 1 shows an embodiment of an optical axis conversion stereoscopic unit screen constituting optical system of the stereoscopic viewing system of the present invention, that is, an example in which the optical system of the present invention in FIG. It is. Here, the left and right input screens L and R are captured by the objective concave lenses L1L and L1R, respectively, and a pair of reflecting mirrors as an optical axis conversion optical system including the objective-side reflecting mirrors M1L and M1R and the eyepiece-side reflecting mirrors M2L and M2R. It enters the zoom optical system Z1 of the camera 31 through the optical systems M1L and M2L and M1R and M2R, and forms a stereoscopic unit screen 41 on the camera image receiving surface. At this time, the optical axis of the input screen is moved by bL and bR in the horizontal direction by the pair of left and right reflecting mirrors, and the sum bL + bR of the left and right three-dimensional screens is realized. In this case, the smaller the zoom angle of view of the camera optical system Z1, the smaller the area of the reflecting mirror and the objective concave lens L1
Although the size (diameter) of L and L1R can be small, it is necessary to shorten the focal length of these objective concave lenses and increase the degree of compression at the same time.

Next, FIG. 2 shows another embodiment of the optical system for forming an optical axis conversion stereoscopic unit screen of the stereoscopic vision system of the present invention. This is a configuration in which one of the left and right screen optical systems does not include an optical axis conversion optical system for moving the optical axis of the screen. That is,
In the case of FIG. 1 described above, the required solid space b is set to bL or b
If any one of R (for example, bR) is covered, the optical axis movement amount on the other (bL) can be made zero, so the mirror pair on that side (M1L, M2L) is not included, The reflecting mirror pair can constitute an optical system only on one side (M1R, M2R).
Therefore, as shown in FIG. 2, the movement of the optical axis at the three-dimensional interval b is realized by the reflecting mirror optical systems M1R and M2R on the right screen, and the image on the left screen is directly transmitted from the concave objective lens L1L2 without passing through the optical axis converting optical system. A configuration for connecting to the camera lens Z1 of the input optical system is realized. In this case, as the optical system of the left screen L, the objective concave lens L1L2 is set directly in front of the camera optical system Z1, but its diameter may be small. In this configuration, one of the screens can be used as direct input with little image degradation. Therefore, when stereoscopic viewing is performed, if the definition of one of the left and right screens is high, the definition of the other is high even if the other is low. It is possible to effectively utilize the three-dimensional effect that a sufficient three-dimensional effect can be obtained. In addition, since the convex mirror performs the same function as the combination of the concave lens and the plane reflecting mirror, the objective concave lenses L1L, L1L2, L1R
The combination of the reflecting mirror pair corresponding to these with the objective-side reflecting mirrors M1L and M1R can be replaced by using the objective reflecting mirrors M1L and M1R as convex reflecting mirrors. That is, the configuration using the convex reflecting mirror is naturally included in the present invention. Furthermore, when actually configuring an optical system, an optical axis refracting prism is inserted between the pair of reflecting mirrors M1L and M2L or M1R and M2R for moving the optical axis to align the optical axis directions of the left and right screens. Although the screen optical axis is often refracted, the description is omitted here because it is not directly related to the operation of the present invention. Although the embodiment of the present invention has been described mainly with respect to a video camera, the present invention is not limited to this.
It can be widely applied to general image input cameras such as ordinary still cameras and electronic cameras.

Next, FIG. 3 shows a conventional example of a display surface constituting a three-dimensional unit screen of a vertical arrangement system in which both left and right screens are arranged vertically. As shown here, the screens arranged vertically are combined by, for example, the eyepiece-side reflecting mirrors M2L and M2R in front of the camera lens Z1 in the optical system of FIG.
In the part corresponding to the boundary of R, both screens are blurred and overlapped to form a blurred part 3F. Alternatively, even if a unit screen image that clearly separates the boundary between the two screens is formed by using an additional optical system, such as forming a real image before the lens, the observation optical system for observing the unit screen image should be used. When masking an unnecessary screen portion with a shielding plate, the edge of the shielding plate near the eyes appears blurred, so that the boundary between the two screens is also blurred. For this reason, in a stereoscopic screen in which these are superimposed for stereoscopic viewing, as shown in FIG. 3B, in this case, unnecessary portions 3CU, 3CD is inserted. Therefore, a clear stereoscopic image is an unnecessary part of this
Only the portion of the effective stereoscopic screen 3S from which 3CU and 3CD are further masked and removed remains, and the effective stereoscopic viewing area is significantly reduced.

On the other hand, FIG. 4 shows an example of the configuration of the display surface of the three-dimensional unit screen of the present invention in the case of forming a vertical arrangement system in which both left and right screens are arranged vertically. That is, FIG. 4A shows a display area 41 of the three-dimensional unit screen, which is a blank area 4F in which a screen corresponding to the blur area 3F at the boundary between the two screens in FIG. Things. This blank area is used when shooting to create a unit screen, for example, M2L, M2R
It can be set on a unit screen by masking on the screen by installing a long and thin mask stripe in the eyepiece boundary area, or by generating a mask area by image processing of the input image. Even if it cannot be set above, it can be realized by setting a stripe mask on the corresponding portion on the display surface. In addition, when trying to move the screen optical axis only by the reflection optical system without using the refractive optical system, when combined with the stereoscopic unit screen, the edge of the other screen is located at the edge of each screen at the boundary between both screens. Although a part of the image may be partially penetrated, this part can be masked by setting the blank area as in the case of the blur between the two screens described above. As a result, as shown in FIG. 4B, a stereoscopic screen in which the unit screens of FIG.
At the upper end and the lower end of the stereoscopic screen, there are 4CU and 4CD areas each having a width corresponding to the blank area 4F and a left or right one of two-dimensional screen parts. However, in this case, unnecessary screen portions are completely masked and no bleeding screen appears, so that the screen area can be widely and effectively used.
That is, although the two-dimensional image portion is located at the upper and lower ends, most of the area centered on the center of the screen is a stereoscopic screen, so that a wide screen can be obtained with little loss of stereoscopic effect. In the screen of FIG. 4 (a), the boundary from the blank area 4F to the left and right screen parts 4L or 4R does not shift from a completely blank state to a step shape, but gradually fades in toward 4L and 4R. If the image configuration is shifted in a state, the connection from the two-dimensional image portion to the three-dimensional image portion can be smoothly formed on the stereoscopic screen. For example, the M2L of FIG.
In the case where a mask stripe is installed on the eyepiece of the M2R, the side of the mask is somewhat blurred because the mask surface is close to the camera lens, and conversely, this effect can be obtained. When the entire screen is configured as a three-dimensional screen, both the left and right screens may be configured on the three-dimensional unit screen using only the screen portions 4L and 4R excluding the blank area. In this case, the stereoscopic image in FIG. 4B is only the area of 4S, but in this case, the area of 4CU and 4CD is a complete blank area. This means that the margin has been expanded, and clear stereoscopic vision is possible even when the mask formed by the shielding plate in the observation optical system is rough. Also, in the configuration of both the left and right screens in the stereoscopic unit screen of FIG. 4A, each screen is an area including a blank area (in this case, the left screen is 4L + 4F, and the right screen is 4R + 4F). In this case, the overall screen is 4S + 4CU + 4CD as shown in FIG. 4 (b), and the upper and lower 4CU and 4CD parts are as described above. Is a two-dimensional image, but a large screen can be obtained.

FIG. 5 shows an embodiment of a stereoscopic observation apparatus in the stereoscopic system of the present invention. This has a function of clearly masking an unnecessary screen portion visible on the three-dimensional unit screen by a shielding plate set at a position away from the eyes. That is, the left and right screens 15L and 15R on the three-dimensional unit screen 15 in FIG.
Is stereoscopically viewed by observing the left and right eyes as the left screen 45L and the right screen 45R through the optical axis refracting optical systems 25L and 25R in the stereoscopic observation device 35, respectively. In this case, the left and right eyes YL, YR
It is necessary to mask unnecessary screens so that they cannot be seen in order to easily stereoscopically observe when observing with. Therefore, in the method of the present invention, by setting the shielding plates S5L and S5R at a position separated by a certain distance ds from the position of the eye, the side of the shielding plate is not too close to the eyes and appears blurred, and the mask is clearly masked. It is something that you can do. This shielding plate has a structure in which the mask side can be variably adjusted in the arrangement direction of the three-dimensional unit screen. In this case, since it is a three-dimensional unit screen with a vertical configuration, as shown by the arrow on the shielding plate in the figure, it is a structure that can move up and down, and move the mask position up and down according to the angle of view when observing each screen, and accurately It has a function to adjust. This makes it possible to clearly mask unnecessary screen portions as viewed from the left and right eyes. Specifically, for example, in the left eye YL, among the screens entering the optical axis refracting optical system 25L, only the necessary left screen 15L passes through, and the unnecessary right screen 1L becomes unnecessary.
5R is masked with a shielding plate S5L. At this time, since the shielding plate S5L is located at a position apart from the eye by the distance ds, the masked edge becomes clear, and the edge portion 35EL shielded by the shielding plate S5L on the screen 45L viewed by the left eye YL is It can be observed as a clearly masked side. Similarly, on the screen 45R viewed by the right eye YR, the left screen 15L is shielded by the shielding plate S5R, and a screen 45R having a clearly shielded side 35ER can be obtained. Of course, it is also possible to adjust the angle of view by observing one of these shielding plates S5L and S5R and fixing the other. Further, the distance ds from the eye can also be set by changing the interval of separating the stereoscopic observation device itself from the eye with the shielding plate attached. In this case, the mask angle of the three-dimensional screen observed through the shield plate can be adjusted by changing the distance at which the observation device to which the shield plate is fixed is separated from the eyes. The same mask adjustment operation as that of the movable adjustment can be realized.

FIG. 6 shows another embodiment of the stereoscopic observation apparatus of the present invention. This is a simpler structure of the observation device of FIG. 5, and one of the shielding plates (in this example, on the left side).
This is a case where S6L is fixed and only the other (in this case, S6R on the right side) is variably adjustable. Also, regarding the optical axis refracting optical system, the left side is configured to directly input the screen, and only the right side is the optical axis refraction by two reflecting mirror pairs MZ1R and MZ2R of the objective side reflecting mirror MZ1R and the eyepiece side reflecting mirror MZ2R. An optical system is installed. By making the optical axis refraction angle variable by using this pair of reflecting mirrors, a stereoscopic observation device that can observe a stereoscopic display surface from a free distance with a simple and compact configuration has been realized. Also, by using only one reflector pair, there is a possibility that the optical axis distance to both screens may differ, but from the position below the eye, which is closer to the lower right screen 16R. Since the optical axis is adopted, it is strictly possible to set the observation points so that the optical axis distance is equal,
Since this difference in distance is small, it can be generally ignored in practical use.

[0016]

In the stereoscopic system according to the present invention,
First, by using the three-dimensional unit screen configuration optical system of the present invention, an adapter that can be mounted on a normal zoom type camera and that can capture a three-dimensional screen including a panoramic screen having a particularly large spread can be significantly reduced in size. It is possible to realize. By using this adapter, a stereoscopic imaging system that is very small and can be easily used by anyone on a daily basis was realized.

Further, in the stereoscopic vision system according to the present invention,
By introducing a stereoscopic unit screen configuration with a blank area at the screen boundary of the stereoscopic display surface and further introducing a stereoscopic observation optical system equipped with a shielding plate that clarifies the outline of the stereoscopic screen, the stereoscopic unit screen is extremely enhanced It is now possible to easily stereoscopically view.

In other words, the realization of the stereoscopic vision system according to the present invention allows ordinary people to take small and convenient stereoscopic video photography and viewing, which can be realized only by a large and specially expensive system by an expert. As a easy-to-use system, it has become possible for the first time to enjoy it in the same way as ordinary photos and videos. This enables the spread and expansion of stereoscopic images to the general society at the present time when it is desired that three-dimensional images, which can be said to be the leaders of the information society, spread more widely in daily life. Yes, and their social contributions are immeasurable.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an optical system constituting a stereoscopic unit optical axis conversion stereoscopic unit screen of the present invention.

FIG. 2 is a diagram showing another embodiment of the optical system for constituting the stereoscopic unit optical axis conversion stereoscopic unit screen of the present invention.

FIG. 3 is a diagram showing a conventional example of a display surface constituting a three-dimensional unit screen of a vertical arrangement type.

FIG. 4 is a diagram showing a configuration of a display surface of the present invention constituting a three-dimensional unit screen of a vertical arrangement type.

FIG. 5 is a diagram showing an embodiment of a stereoscopic observation device in the stereoscopic system of the present invention.

FIG. 6 is a diagram showing another embodiment of the stereoscopic observation device of the present invention.

FIG. 7 is a diagram showing the operation principle of the optical axis conversion stereoscopic unit screen configuration optical system of the present invention.

[Explanation of symbols]

3F, bleeding part of both screens 3CD, 3CU, oozing unnecessary part of both screens 3S, effective stereoscopic screen part 4F, blank area 4L, 4R, left and right screen part 4CD, 4CU, two-dimensional screen part 4S, stereoscopic Visual image area 15, 16, stereoscopic unit screen 15L, 15R, 16L, 16R, left and right screen 25L, 25R, optical axis refracting optical system 31, camera 35, 36, stereoscopic observation device 35EL, 35ER, 36EL, 36ER, shielded Edge part 41, display surface of stereo unit screen 45L, 45R, 46L, 46R, left and right observation screen A, input screen b, solid space bL, bR, optical axis movement distance G, GI, received light L, R, input screen L1, L1L, L1L2, L1R, Objective lens M1, M1L, M1R, MZ1R, Objective mirror M2, M2L, M2R, MZ2R, Eyepiece mirror S5L, S5R, S6L, S6R, Shield w1, w2, Angle of view x, distance YL, YR, left and right eyes Z1, camera optics lens

Claims (6)

[Claims] 1. A stereoscopic system using an optical axis conversion stereoscopic unit screen constituting optical system, comprising an objective input unit having a concave lens optical system pair and an output unit connected to a telephoto lens image input optical system. 2. The stereoscopic system according to claim 1, wherein one of the left and right optical systems does not include an optical axis conversion optical system. 3. A stereoscopic unit screen configuration characterized in that a blank area is set at a boundary between both displayed stereoscopic screens. 4. A three-dimensional unit screen structure according to claim 3, wherein an extended screen part is included at each outer end of the display screen. 5. A stereoscopic observation apparatus having a function of adjusting an angle of view mask by making one or both of screen shielding plates variable. 6. A stereoscopic observation apparatus characterized in that a screen shielding plate is installed at a position distant from the position of the eyes.