JPH08338964A - Binocular stereoscopic display device - Google Patents

Abstract

PURPOSE: To project a large stereoscopic image having high resolution in a binocular stereoscopic display device using the linear arrayed light emitting elements such as an LED array or the like. CONSTITUTION: As for a constitution where the light of a light emitting element 8 lighting in a time-division manner is made incident on a polygon mirror 10 through an objective lens 9 and is deflected left and right and images being independent left and right are projected on the eyes 15 and 16 of an observer by a pair of left and right fixed reflection mirrors 11 and 12 and an eyepiece 13; a refractive system which consists of the objective lens 9 and the eyepieces 13 and 14 is constituted as a relay lens system image-reforming the intermediate real image of the light emitting element 8 formed at an intermediate part, and the reflection surfaces of a rotary reflection mirror 10 and the fixed reflection mirrors 11 and 12 are positioned at the reduced part of an optical path width reaching the eyepieces 13 and 14 from a position separated from the objective lens 9 toward the intermediate real image by a specified length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binocular stereoscopic display device using a linear array of light emitting elements such as an LED array, and an object thereof is to project a smoothly moving moving image as a large stereoscopic image.

[0002]

2. Description of the Related Art As a binocular stereoscopic display device, there is one having a structure as shown in FIG. 7 (Japanese Patent Laid-Open No. 4-3059).
0).

In FIG. 7, light emitted from an LED array 1 in which a plurality of light emitting elements are arranged in a direction orthogonal to the plane of the paper enters a rotary reflecting mirror 3 which is a single-sided or double-sided mirror through a lens 2 and left and right fixed reflections. The mirrors 4 and 5 are deflected and scanned. When the LED array 1 is made to emit light with the left and right image data by adjusting the timing in the deflection direction, independent left and right images can be made incident on the left and right eyes 6 and 7, and the observer can recognize it as a stereoscopic image. Further, moving images are reproduced by changing the left and right images for each display frame.

[0004]

When the optical system is constructed by a single lens as shown in FIG. 7, the optical system is determined according to the distance between the left and right eyes of the observer, and the lens diameter is large, so that the light is rotated and reflected. The optical path width cannot be reduced at the position where the mirror branches to the left and right fixed reflecting mirrors. Therefore, there arises a problem that the optical design is restricted, an image viewed by an observer becomes small, and the display device becomes insufficient. This restriction becomes a greater problem when an image to be presented to an observer is made to have a wide wide screen in the lateral direction in order to enhance the sense of presence. When the horizontal direction is adjusted to the range of a small image that can be formed, the vertical length shorter than this is further shortened, and the image viewed by the observer becomes impractical.

Further, due to the limitation of the optical path width, a polygon mirror cannot be used as a rotary reflecting mirror. This is because the size of one reflecting surface of the polygon mirror is small with respect to the entire size of the reflecting surface, so that it cannot be incorporated in a limited space. If a polygon mirror is used, the number of projection frames per rotation can be increased and the resolution can be increased to enable smooth moving image reproduction. However, in the above-mentioned conventional example, only the front and back mirrors can be used.

Therefore, an object of the present invention is to provide a binocular stereoscopic display device having a structure in which a polygon mirror can be used, which can obtain a stereoscopic image having a large magnification and a high sense of reality.

[0007]

DISCLOSURE OF THE INVENTION A binocular stereoscopic display device provided by the present invention is a rotation device for deflecting light of a linear array of light-emitting elements which is incident through an objective lens in a left-right direction orthogonal to a direction in which the light-emitting elements are arranged. Between the pair of left and right fixed reflecting mirrors that reflect the light that is deflected left and right by the reflecting mirror and the rotating reflecting mirror to the left and right eyes of the observer, and between the pair of left and right fixed reflecting mirrors and the left and right eyes of the observer. Having a pair of left and right eyepieces arranged, by turning on the light-emitting element according to the rotational position of the rotary reflecting mirror in a time-division manner, in a configuration for projecting a stereoscopic image on the eyes of the observer

The refraction system consisting of the objective lens and the eyepiece lens is constructed as a relay lens system for re-imaging the intermediate real image of the light emitting element formed in the intermediate part to show to the observer, and from the objective lens to the intermediate real image. It is characterized in that the reflecting surfaces of the rotary reflecting mirror and the fixed reflecting mirror are located in a portion where the optical path width from the position separated by a predetermined length to the eyepiece lens is reduced.

The rotating mirror may be a front / rear mirror or a polygon mirror.

Since the light emitting elements are lighted in a time-division manner according to the rotation position of the rotary reflecting mirror, one row can be used.

The binocular stereoscopic display device of the present invention comprises:
In order to adjust the diopter according to the visual acuity of the observer, it is necessary to move at least one of the lenses constituting the objective lens and the eyepiece lens in the optical axis direction within the optical path at a constant distance from the light emitting element to the eye. A degree adjusting mechanism can be provided.

[0012]

The binocular stereoscopic display device of the present invention which employs the relay lens system, as shown in FIGS. In addition, the rotary reflecting mirror 10 and the fixed reflecting mirror 11,
12 reflective surfaces are arranged.

1 for each deflection angle of the rotary reflecting mirror 10.
One optical path and one intermediate real image a are determined. 1 and 2
Three intermediate real images B (extending in the direction orthogonal to the paper surface) at the left end, the center, and the right end that form one frame of the image are drawn at the same time along with the optical paths that form them. From these figures, it appears that the optical path is widened by the deflection of the rotary reflecting mirror 10, but when looking at one optical path, it is surely converged from the objective lens 9 toward the intermediate real image B. That is, the above-mentioned reduced portion of the optical path width means this convergence, and it is assumed that it is smaller than the optical path width required when the deflecting / scanning is performed by the rotary reflecting mirror 10 without the converging action of the objective lens 9. Means being done.

In the examples shown in FIGS. 1 and 2, the swing angle effective for forming an image of the polygon mirror (rotary reflecting mirror) 10 is increased so as to project a horizontally wide screen which is one of the objects of the present invention. These figures show that, even with this design, the polygon mirror and fixed reflecting mirror are arranged with sufficient space.

As described above, since the rotary reflecting mirror 10 and the fixed reflecting mirrors 11 and 12 are arranged in the portion where the optical path width is reduced, a space is provided for the arrangement and a large effective swing angle of the rotary reflecting mirror 10 is obtained. Thus, a wide image having a large aspect ratio in the vertical and horizontal directions can be formed without reducing the size of the image.

In particular, the relay lens system adopted in the present invention can have a larger magnification than that using the single lens shown in FIG. 7, so that the wide screen can be obtained with a high-magnification image. Have. For this magnification,
Next, a description will be given.

In the case of FIG. 7, since the optical system is composed of a single lens, the magnifying power of the loupe is m = 250 (mm) / f. That is, from the focal length f of a lens having a practical diameter, only a magnification of several times to 10 times can be obtained. In the case of the relay lens system, the spatial real image (intermediate real image) a magnified by the objective lens 9 is further magnified by the eyepiece lenses 13 and 14 so that the observer can see it as a virtual image as shown in FIG. In this optical system, if the optical tube length is Δ and the focal lengths of the objective lens 9 and the eyepiece lens 13 are f1 and f2, the magnification is m = 250.
・ Δ / (f1 ・ f2), and the same high magnification as the compound microscope can be obtained.

Further, in the present invention, as described above, since a space is provided in the arrangement space of the rotary reflecting mirror 10 and the fixed reflecting mirror 11, a polygon mirror having a large overall shape with respect to one reflecting surface is used as the rotating reflecting mirror 10. Can be used as. As a result, the resolution can be improved by increasing the number of display frames per rotation as compared with the front / rear mirror, and smooth moving image reproduction can be performed.

By obtaining left and right images by time-divisional lighting of the light emitting elements 8 in one row, it is possible to reduce the number of parts, simplify the driving circuit, and reduce the cost.

The diopter adjusting mechanism includes a light emitting element 8 to an eye 15,
At least one of the lenses forming the objective lens 9 and the eyepieces 13 and 14 in the optical path of a constant distance reaching 16
By moving in the optical axis direction, the imaging point is moved back and forth,
Adjust the diopter according to the eyesight of the observer.

[0021]

Embodiments of the binocular stereoscopic display device of the present invention will be described below.

FIG. 1 and FIG. 2 show an embodiment of the present invention, in which a state in which an image is incident on an observer's eye due to rotation of a polygon mirror which is a rotary reflecting mirror 10 shows a right eye 15 and a left eye. Each of the 16 is shown separately.

In the figure, 8 is an LED array which is a linear array of light emitting elements and is arranged in a direction perpendicular to the plane of the drawing. Reference numeral 9 is an objective lens, 10 is a rotary reflecting mirror constituted by a polygon mirror, 11 and 12 are a pair of left and right fixed reflecting mirrors, 13 and 14 are a pair of left and right eyepieces, and 15,
Reference numeral 16 represents the left and right eyes of the observer.

With this structure, the light emitted from the LED array 8 is magnified by the objective lens 9 having a three-element structure to form a real image B in the apparatus (since the light emitting element 8 extends in the direction perpendicular to the paper surface, the real image is formed). B is long in the direction orthogonal to the paper surface.) In this embodiment, a spatial real image a is formed behind the front field lens of the eyepiece lens 13.

The rotating reflecting mirror 10 deflects the light passing through the objective lens 9 by rotating. Due to this deflection, the light of the LED array 8 is moved in the left-right direction, and two-dimensional images are produced separately in the left-right direction.

The fixed reflecting mirrors 11 and 12 are the rotating reflecting mirror 10.
The light deflected left and right by the eyepieces 13 and 14
Reflected in the optical axis direction of.

The eyepiece lenses 13 and 14 further magnify the spatial real image B and project it on the eyes 14 and 15 of the observer as a virtual image. The eyepieces 13 and 14 of the illustrated example are of a two-piece construction in which a field lens and an eye lens are combined in order to expand the field of view and correct aberrations.

In the left and right images, when the reflecting surface of the rotary reflecting mirror 10 moves within a certain angle range, each of the lights passing through the right half or the left half of the objective lens 9 is made incident on the eyepiece lenses 13 and 14. Formed by. Therefore, if the light emission of each element of the LED array 8 is time-divisionally controlled according to the rotation of the rotary reflecting mirror 10 according to the image data to be displayed, a three-dimensional stereoscopic image is obtained by combining the left and right images, and the display frame is displayed. By changing the display screen every time, it becomes possible to play the video.

The arrangements of FIGS. 1 and 2 enable formation of a wide image with high magnification and use of a polygon mirror for the rotary reflecting mirror 10. Therefore, the objective lens 9 and the eyepieces 13, 1 are used.
The refraction system consisting of 4 is a relay lens system for re-imaging the magnified intermediate real image a of the LED array 8 as a further magnified virtual image and showing it to an observer. You can change the element.

For example, the objective lens 9 has a constitution of one group of three in order to increase the magnification and eliminate the aberration, but the number of the lenses is not limited. The rotary reflecting mirror 10 may be a single-sided or double-sided reflecting mirror, and even in this case, an effect of high magnification can be obtained. It is also possible to use prisms for the fixed reflecting mirrors 11 and 12. The eyepiece lens 9 is not limited to the above two-lens structure as long as it can magnify and observe the intermediate real image B.

In the above embodiment, it is shown as an image in FIG. 3 that high magnification can be obtained even with a wide screen.
The virtual image seen by the observer's eyes is projected as a large image on the virtual screen 17 far from the LED array 8. In the device of the present invention, the aspect ratio of the virtual image is 9: 1.
6 have been obtained. That is, as described above, the adoption of the relay lens system alleviates the restrictions on the optical design, allows the effective swing angle of the rotary reflecting mirror to be sufficiently large, and forms a wide screen that is sufficiently wide in the left-right direction. it can.

In the structure shown in FIGS. 1 and 2 above,
In order to adjust the diopter according to the visual acuity (diopia and near diopter) of the observer, the light emitting element 8 and the eyes 15 and 16 kept at a constant distance
In between, at least one of the lenses forming the objective lens 9 and the eyepieces 13 and 14 may be moved in the optical axis direction. This is a concept in which the intermediate real image B is displaced relative to the object-side focal points of the eyepiece lenses 13 and 14 to perform diopter adjustment. When moving the lenses of the eyepieces 13 and 14, it is necessary to move the left and right as a unit, but this is not necessary because the objective lens 9 is common.

In the embodiment shown in FIGS. 1 to 3, the light emitting element 8 is used.
And the eyes 15 and 16 of the observer are in a positional relationship of facing each other with the fixed reflecting mirrors 11 and 12 interposed therebetween. As shown in FIG. 4, by setting the inclination α ° (the inclination in the case of FIGS. 1 and 2) of the fixed reflecting mirror 11 to the optical axis to be (90 ° −α °), the position in the same direction can be obtained. Can be in a relationship.

An embodiment in which the positional relationship is in the same direction is shown in FIGS. FIG. 5 shows a state in which an image is incident on the right eye 15 by rotating the polygon mirror 10, and FIG. 6 shows a state in which an image is incident on the left eye 16 with the same configuration. In this embodiment, the objective lens 9 has a two-lens structure, the eyepiece lens 13 has a one-lens structure, and the spatial real image B is between the fixed reflecting mirrors 11 and 12 and the eyepieces 13 and 14. Has been formed.

The feature of this embodiment is that the fixed reflecting mirrors 11 and 1 are
By arranging the light-emitting element 8 and the objective lens 9 so as to be sandwiched between the left and right optical systems composed of 2 and the eyepieces 13 and 14, the binocular stereoscopic display device is downsized in the depth direction. .

This structure is possible as described above.
This is because the rotary reflecting mirror (polygon mirror) 10 and the fixed reflecting mirrors 11 and 12 can be made smaller by adopting the relay lens system.

[0037]

As described above, the present invention provides an LED
In a binocular stereoscopic display device using a linear array of light-emitting elements such as an array, the refraction system is configured as a relay lens system, and the reflection of a rotating mirror is reflected in the optical path width reduction part between the spatial real image and the objective lens. Since the surfaces are arranged, it is possible to obtain a high magnification, increase the degree of freedom in optical design, and display a large stereoscopic image with high resolution by adopting a polygon mirror.

[Brief description of drawings]

FIG. 1 shows an embodiment of a binocular display device of the present invention, showing a state in which an image is incident on the right eye by the rotation of a polygon mirror.

FIG. 2 shows a state in which an image is incident on the left eye in the embodiment of FIG.

FIG. 3 shows an example of image formation in the embodiment shown in FIGS. 1 and 2.

FIG. 4 is a diagram illustrating that the positional relationship between the light emitting element and the observer's eye with respect to the fixed reflecting mirror can be opposed or in the same direction.

FIG. 5 is another embodiment of the binocular display device of the present invention, showing a state in which an image is incident on the right eye by the rotation of a polygon mirror.

FIG. 6 shows a state in which an image is incident on the left eye in the embodiment of FIG.

FIG. 7 shows a configuration example of a conventional binocular stereoscopic display device.

[Explanation of symbols]

 8 Light-Emitting Element (LED Array) 9 Objective Lens 10 Rotating Reflecting Mirror (Polygon Mirror) 11, 12 Fixed Reflecting Mirror 13, 14 Eyepieces 15, 16 Left and Right Eyes of Observer

Claims (5)

[Claims] 1. A rotary reflecting mirror that deflects light of a linear array of light-emitting elements that enters through an objective lens in a left-right direction that is orthogonal to a direction in which the light-emitting elements are arranged, and light that is horizontally deflected by the rotary reflecting mirror. A pair of left and right fixed reflecting mirrors that reflect the left and right eyes of the observer, a pair of left and right fixed reflecting mirrors, and a pair of left and right eyepieces disposed between the left and right eyes of the observer, and a rotating reflecting mirror. In the binocular stereoscopic display device that projects a stereoscopic image on the eyes of the observer by turning on the light-emitting elements in accordance with the rotational position of the, the refraction system consisting of the objective lens and the eyepiece lens is formed in the middle part. A relay lens system that re-images the intermediate real image of the light-emitting element to show it to the observer, and reduces the optical path width from the position away from the objective lens by a predetermined length toward the intermediate real image to the eyepiece. To the reflex Binocular stereoscopic Display device being characterized in that to position the reflecting surface of the fixed reflector and. 2. The binocular stereoscopic display device according to claim 1, wherein the rotary reflecting mirror is constituted by front and back mirrors. 3. The binocular stereoscopic display device according to claim 1, wherein the rotary reflecting mirror is a polygon mirror. 4. The binocular stereoscopic structure according to any one of claims 1 to 3, wherein the light-emitting elements are one group and one row, and left and right images are obtained by time division lighting. Display device. 5. A diopter adjusting mechanism for moving at least one of the lenses constituting the objective lens and the eyepiece lens in the optical axis direction within an optical path at a constant distance from the light emitting element to the observer's eye is provided. Any one of claims 1 to 4 characterized in that
The binocular stereoscopic display device described in the paragraph.