JP2000056256A - Picture display device using concaved mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the installation occupancy area of the whole of a device smaller with respect to a picture display device using a concaved mirror. SOLUTION: Relating to a picture display device in which a concaved mirror 3 is used and image light which are projectedly displayed at the side of the picture display of a screen 4 by a picture projector 1 are turned back to the side of a monitoring position with the concaved mirror 3, the picture projector 1 is arranged at a side opposite to the video display surface of the screen 4 to reduce the installation occupancy area of the whole of the device by providing a mirror 2 reflecting the image light projected by the projector 1 so as to reach the screen 4 by being turned back once on the concaved mirror 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device using a concave mirror, and more particularly, to an image display device including an image projection device and a screen, and a concave mirror. An image display device for viewing an image projected on an image display device, and is particularly suitable for displaying a realistic image used for a simulator, a game device, a virtual reality (hereinafter, referred to as VR) device or the like. The present invention relates to an image display device having a concave mirror.

[0002]

2. Description of the Related Art Various types of video display devices for use in VR equipment and the like have been proposed in order to give a virtual sense of reality. However, an image display device using a concave mirror has a sense of depth. It is practical because it can display video.

[0003] This is composed of an image device consisting of an image projection device and a screen, and a concave mirror, and allows a viewer to view an image projected on the projection device through the concave mirror. The basic configuration of the image display device is an old technology, as described in Japanese Patent Publication No. 55-13031.

In the image display device using the concave mirror, the viewer is enlarged more greatly than the image projected on the projection device by determining the positional relationship between the concave mirror, the projection device and the viewer to be a predetermined one. A virtual image can be observed. Therefore, there is an effect of giving the viewer a sense of realism. Further, a flight training simulator called a flight simulator, which includes an image display device in which the oscillating device is synchronized to enhance the effect of realism, has been developed.

FIGS. 4 and 5 are a schematic side sectional view and a main part top view of an image display device having a concave mirror according to the prior art. 4 and 5, reference numeral 1 denotes an image projection device, 4c denotes a reflection type screen for forming an image projected from the image projection device 1, and 3c denotes a viewer 6 projected on a reflection type screen 4c. A concave mirror 7 for reflecting and viewing an image is a viewpoint position of a viewer 6.

In the configuration shown in FIGS. 4 and 5, the viewpoint position 7 of the viewer 6 is located near the center of curvature of the concave mirror 3c, and the reflection type screen 4c is connected to the viewpoint position 7 of the viewer 6 and the concave mirror. It is located below the concave mirror 3c at an intermediate position of the concave mirror 3c and near the focal point of the concave mirror 3c so as not to block the field of view of the viewer 6.

Here, the approximate dimensions of each member for allowing the viewer 6 to view an image of about 40 ° horizontally and about 30 ° vertically are as follows.
It is easily obtained from a ray diagram. The radius of curvature of the screen 4c is about 1.5 m, the width of the screen is about 1.2 m, the dimension in the height direction of the screen is about 1 m, and the radius of curvature of the concave mirror 3c is about 3
m, the width of the concave mirror is about 2 m, and the height dimension of the concave mirror is about 1.5 m. In this case, the image projection device 1
Projection distance is about 1.8m, device depth is about 0.4m
Thus, a liquid crystal projector is used in which a liquid crystal panel is used for an image display unit and enlarged and projected by a projection lens.

With the above arrangement, when the viewer 6 views the image projected on the reflection type screen 4c as reflected by the concave mirror 3c, the image is formed as an image. The surface becomes a virtual image at a point at almost infinity, and has a feature that looks like an image with a sense of depth.

[0009]

When the apparatus constructed as described above is used for a VR device or the like, it is desired that the floor area occupied by the apparatus be as small as possible. This is an important solution for effective use of finite floors,
Also, by reducing the installation space, it becomes possible to install the device in a room where it could not be installed so far, and the application of the device can be expanded.

The above-mentioned occupied floor area will be described by taking the above-mentioned prior art as an example. In the prior art, the screen is arranged in a lower front part of the viewer in order to provide the screen at a position that does not block the field of view of the viewer. In addition, an image projection device that projects an image on a screen is arranged to face an image display surface of the screen. Therefore, the depth dimension of the entire device is approximately the sum of the thickness of the screen, the projection distance, and the depth dimension of the image projection device,
In the case of the above example, it is about 2.7 m. Of these, the upper and left and right sides of the image projection device are dead spaces and are useless. However, when the present image display device is installed, an installation space having a width of 2 m and a depth of 2.7 m including this useless portion is required. In such an image display device according to the related art, the occupied floor area is reduced. The challenge was still to be solved.

[0011] The present invention has been made in view of the above points,
An object of the present invention is to provide an image display device having a concave mirror, which requires a small occupied floor area for installation.

[0012]

In order to achieve the above-mentioned object, the present invention provides an image projecting apparatus such that image light projected by the image projecting apparatus is once turned by a concave mirror and projected and displayed on a screen. A mirror for reflecting the image light to be projected is provided.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a main part of an image display device according to a first embodiment of the present invention. In FIG. 1, 1 is an image projection device, 2 is a mirror that reflects image light projected by the image projection device 1, 3 is a concave mirror, and 4 is an image projection device 1.
Is a reflective screen for displaying the projected image of the image display device, 5 is a frame line indicating the housing of the image display device, 6 is a viewer, and 7 is a viewpoint from which the viewer views the video.

In FIG. 1, details of a frame for structurally fixing the image projection device 1, the reflection type screen 4, the concave mirror 3, and the like at predetermined positions and a cabinet for covering the entire device are omitted.

In this embodiment, the reflection type screen 4 is
It is arranged slightly below the viewer 6 in front. The reflective screen 4 has its convex and substantially spherical screen surface facing the concave mirror 3 side. The radius of curvature of the concave mirror 3 is slightly less than twice the radius of curvature of the reflective screen 4.
The concave mirror 3 and the reflective screen 4 are arranged such that the center of curvature of the concave mirror 3 and the center of curvature of the reflective screen 4 are close to each other. Further, the image projection device 1 is in a standing state in which the image projection device 1 is slightly inclined between the reflective screen 4 and the viewer 6 (that is, in a space opposite to the image display surface of the reflective screen 4). Mirror 2
Are arranged slightly obliquely above the image projection device 1.

The viewpoint position 7 of the viewer 6 is
The reflective screen 4 blocks the field of view of the viewer 6 at a position intermediate the viewpoint 7 of the viewer 6 and the concave mirror 3 and near the focal point of the concave mirror 3. It is located below the concave mirror 3 so as not to be located.

In the above-described configuration, the image light emitted from the image projection device 1 slightly obliquely upward is bent by the mirror 2 and is projected toward the concave mirror 3. Then, the image light is reflected by the concave mirror 3 and an image is projected on the reflection type screen 4. further,
The image light projected on the reflection type screen 4 is reflected on the screen surface, projected again to the concave mirror 3, reflected again by the concave mirror 3, and turned back toward the viewpoint 7 of the viewer 6. I have.

In the image display apparatus of the present embodiment configured as described above, as described above, the output image of the image projection apparatus 1 is reflected by the mirror 2 and the concave mirror 3 and projected on the reflection type screen 4. The image on the reflective screen 4 is reflected and projected onto the concave mirror 3 again, and is further folded back by the concave mirror 3 so that the viewer 6 can view the image. In this way, as described above, the viewer 6
However, when the image projected on the reflection type screen 4 is viewed as reflected by the concave mirror 3, the image is
The image forming plane becomes a virtual image at a point substantially at infinity, and the image is seen as an image with a sense of depth.

The image projection apparatus 1 has a projection lens, an image display section, and the like optically designed and arranged so that an image can be formed on a convex substantially spherical screen. This is a liquid crystal projector equivalent to that described above. The reflection type screen 4 is formed by molding a transparent resin into a substantially spherical surface and providing a diffusion layer on the surface thereof. The concave mirror 3 is formed by molding a transparent resin into a substantially spherical shape and forming a reflective film such as aluminum on the surface thereof. The mirror is a substantially flat mirror, and the base is made of glass or resin, and is formed of a reflective film such as aluminum.

Here, in the same manner as described in the prior art, each member in the present embodiment necessary for allowing the viewer 6 to view an image of about 40 ° in the horizontal direction and about 30 ° in the vertical direction. The schematic dimensions are as follows: the radius of curvature of the screen 4 is about 1.5 m, the width of the screen is about 1.2 m, the dimension in the height direction of the screen is about 1 m, the radius of curvature of the concave mirror 3 is about 3 m, and the width of the concave mirror is about 2 m. The height dimension of the concave mirror is about 1.7 m. Further, assuming that the projection distance of the image projection device 1 is about 1.8 m and the depth dimension of the image projection device is about 0.4 m, when the image display device according to the present embodiment is installed, the width of 2 m × about 2 m is set. Installation space.

Accordingly, in the present embodiment, the installation area (occupied floor area) can be reduced by about 25% compared to the installation space width of 2 m × depth of 2.7 m according to the prior art, so that a compact image display device using a concave mirror is used. Can be realized.

FIG. 2 is a side sectional view of a main part of an image display device according to a second embodiment of the present invention. The present embodiment differs from the first embodiment in that the image projection device and the reflection type screen are located in the upper front part of the viewer.

In FIG. 2, 2a is a mirror for reflecting the image light projected by the image projection apparatus 1, 3a is a concave mirror, 4a is a reflection type screen, and other components are the same as those of the first embodiment. .

In this embodiment, the reflection type screen 4a
Are arranged slightly above the viewer 6. The reflection-type screen 4a has a convex and substantially spherical screen surface facing the concave mirror 3a. The radius of curvature of the concave mirror 3a is slightly less than twice the radius of curvature of the reflective screen 4a, and the center of curvature of the concave mirror 3a and the reflective screen 4a.
a such that the concave mirror 3 is positioned close to the center of curvature of a.
a and the reflective screen 4a are arranged. Further, the image projection device 1 is in a standing state in which the image projection device 1 is slightly inclined between the reflective screen 4a and the viewer 6 (that is, in a space opposite to the image display surface of the reflective screen 4a). The mirror 2a is arranged slightly diagonally below the image projection apparatus 1.

The viewpoint position 7 of the viewer 6 is
The reflection type screen 4a, which is located near the center of curvature of a.
It is located at an intermediate position between the viewpoint position 7 of the viewer 6 and the concave mirror 3a, and near the focal point of the concave mirror 3a and above the concave mirror 3a so as not to block the field of view of the viewer 6.

In the configuration described above, the image light emitted from the image projection device 1 slightly obliquely downward is bent by the mirror 2a and projected toward the concave mirror 3a. The image light is reflected by the concave mirror 3a, and an image is projected on the reflection type screen 4a.
Further, the image light projected on the reflection type screen 4a is reflected on the screen surface, projected again to the concave mirror 3a, reflected again by the concave mirror 3a, and folded back toward the viewpoint 7 of the viewer 6. Has become.

In the image display apparatus of the present embodiment thus configured, as described above, the output image of the image projection apparatus 1 is reflected by the mirror 2a and the concave mirror 3a and projected on the reflection type screen 4a. The image on the reflective screen 4a is reflected and projected onto the concave mirror 3a again, and is further folded back by the concave mirror 3a, so that the viewer 6 can view the image. In this way, as described above, when the viewer 6 views the image projected on the reflection type screen 4a as reflected by the concave mirror 3a, the image has an image forming surface. It becomes a virtual image of the point at almost infinity,
You will see the image with a sense of depth.

The image projection apparatus 1, the reflection type screen 4a, the concave mirror 3a, and the mirror 2a are the first
The configuration is the same as that of the embodiment.

Here, in the same manner as described in the prior art, each member in the present embodiment necessary for allowing the viewer 6 to view an image having a horizontal angle of about 40 ° and a vertical angle of about 30 °. The schematic dimensions are as follows: the radius of curvature of the screen 4a is about 1.5 m, the width of the screen is about 1.2 m, the dimension in the height direction of the screen is about 1 m, the radius of curvature of the concave mirror 3a is about 3 m, and the width of the concave mirror is about 2 m. The height dimension of the concave mirror is about 1.7 m.
Further, assuming that the projection distance of the image projection device 1 is about 1.8 m and the depth dimension of the image projection device is about 0.4 m, when the image display device according to the present embodiment is installed, the width of 2 m × about 2 m is set. Installation space.

Therefore, in the present embodiment, the installation area can be reduced by about 25% compared to the installation space width of 2 m × depth of 2.7 m according to the prior art. In this embodiment, the height of the entire apparatus is higher than that of the first embodiment. However, since the image display apparatus has a space at the bottom, the viewer 6 can use a seat (not shown). ) And suitable for viewing.

FIG. 3 is a side sectional view of a main part of an image display device according to a third embodiment of the present invention. This embodiment differs from the first embodiment in the type of mirror that reflects the image light projected by the image projection device and the position of the mirror.

In FIG. 3, reference numeral 2b denotes a mirror for reflecting the image light projected by the image projection apparatus 1, 3b denotes a concave mirror, and other components are the same as those in the first embodiment.

In this embodiment, the reflection type screen 4 is
It is arranged slightly below the viewer 6 in front. The reflection-type screen 4 has its convex and substantially spherical screen surface facing the concave mirror 3b. The radius of curvature of the concave mirror 3b is slightly less than twice the radius of curvature of the reflective screen 4, and the concave mirror 3b and the reflective mirror are positioned so that the center of curvature of the concave mirror 3b and the center of curvature of the reflective screen 4 are close to each other. The screen 4 is arranged. Further, the image projection device 1 is disposed between the reflective screen 4 and the viewer 6 (that is, in a space opposite to the image display surface of the reflective screen 4) in an upright state, The mirror 2b is arranged above the image projection device 1 and in the path of the image light that is turned back by the concave mirror 3b toward the viewpoint 7 of the viewer 6. The mirror 2b is constituted by a half mirror having a function of reflecting about 50% of light and transmitting about 50% of light.

The viewpoint position 7 of the observer 6 is different from that of the concave mirror 3.
The reflection type screen 4 is located in the vicinity of the center of curvature of b, and the view of the viewer 6 is provided at an intermediate position between the viewpoint position 7 of the viewer 6 and the concave mirror 3b and near the focal point of the concave mirror 3b. It is located below the concave mirror 3b so as not to be blocked.

In the configuration described above, the image light emitted upward from the image projection device 1 is bent by the mirror 2b and projected toward the concave mirror 3b.
Then, the image light is reflected by the concave mirror 3b, and an image is projected on the reflection type screen 4. Further, the image light projected on the reflection type screen 4 is reflected on the screen surface, projected again toward the concave mirror 3b, reflected again by the concave mirror 3b, transmitted through the mirror 2b, and passed through the mirror 7b. It is supposed to go to.

In the image display device of the present embodiment having the above-described configuration, as described above, the output image of the image projection device 1 is reflected on the mirror 2b and the concave mirror 3b and projected on the reflection type screen 4, and The image on the reflective screen 4 is reflected and projected again on the concave mirror 3b, and after being further turned back by the concave mirror 3b, passes through the mirror 2b, thereby allowing the viewer 6 to view the image. I have. In this way, as described above, the viewer 6 can use the reflection type screen 4
When the image projected on the screen is viewed as reflected by the concave mirror 3, the image becomes a virtual image at an infinity point on the image forming plane, and appears as an image with a sense of depth.

The image projection device 1, the reflection type screen 4, and the concave mirror 3b have the same configurations as those of the first embodiment. The mirror 2b is a substantially flat mirror whose base material is made of glass or resin, which is formed by forming a reflection film of aluminum or the like, and whose reflectance and transmittance are set to be substantially equal. ing.

Here, in the same manner as described in the prior art above, each member in the present embodiment necessary for allowing the viewer 6 to view an image of about 40 ° in the horizontal direction and about 30 ° in the vertical direction. The schematic dimensions are as follows: the radius of curvature of the screen 4 is about 1.5 m, the width of the screen is about 1.2 m, the height dimension of the screen is about 1 m, the radius of curvature of the concave mirror 3 b is about 3 m, and the width of the concave mirror is about 2 m. The height dimension of the concave mirror is about 1.7 m. Assuming that the projection distance of the image projection device 1 is approximately 1.8 m and the depth dimension of the image projection device is approximately 0.4 m, when the image display device according to the present embodiment is installed, the width is 2 m × the depth is approximately 2 m.
Installation space.

Accordingly, in the present embodiment, the installation area can be reduced by about 25% compared to the installation space width of 2 m × depth of 2.7 m according to the prior art.

In the present embodiment, when the image projection device 1 is disposed so that the optical path of the image light to the reflective screen 4 and the optical path of the image light monitored by the viewer are substantially equal, the concave mirror 3b This has the effect of canceling the distortion.

The size and configuration of the image projection device according to the present invention are arbitrary as long as they satisfy the technical idea of the present invention, and the image display source is not limited to the liquid crystal panel described above. It is needless to say that the same effect can be obtained by any optically designed and arranged projection lens, image display unit, and the like so that an image can be formed on a convex substantially spherical screen.

[0042]

As described above, according to the present invention, the image light projected by the image projection device is once turned back by the concave mirror and displayed on the screen, and the image displayed on the screen is again displayed by the concave mirror. Since it is configured to be folded back to the viewing position side, the image projection device that projects the image on the screen is installed on the side opposite to the image display surface of the screen instead of facing the image display surface of the screen Accordingly, the area occupied by the entire apparatus can be reduced, and a compact image display apparatus can be realized. Further, according to the present invention, in the path of the image light turned toward the viewer by being turned back by the concave mirror, the half reflecting the image light from the image projection device and transmitting the image light from the concave mirror toward the viewer is transmitted. Since the mirror is provided, the optical path of the image light to the screen and the optical path of the image light monitored by the viewer can be easily configured to be substantially equal, and the distortion of the concave mirror can be canceled. Furthermore, according to the present invention, since the image projection device can be easily installed so as not to be directly seen by a viewer, the viewer can easily know the principle of the image display device. Since it is not possible to concentrate on the image itself, there is also a secondary effect that the immersive feeling is increased and a more realistic image can be watched.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part of an image display device according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a main part of an image display device according to a second embodiment of the present invention.

FIG. 3 is a side sectional view of a main part of an image display device according to a third embodiment of the present invention.

FIG. 4 is a schematic side sectional view of a conventional image display device.

FIG. 5 is a top view of a main part of a conventional image display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image projection apparatus 2, 2a, 2b Mirror 3, 3a, 3b, 3c Concave mirror 4, 4a, 4c Reflective screen 5 Frame showing frame 6 Viewer 7 Viewpoint

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/74 H04N 5/74 A (72) Inventor Hideo Tanide 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa-ken F-term (reference) in Multimedia System Development Division, Hitachi, Ltd. 2C001 CC00 CC01 CC03 CC06 5C058 AB06 EA11 EA13 EA33 9A001 BB04 JZ76 KZ45

Claims (4)

[Claims] An image display device comprising at least an image projection device, a screen, and a concave mirror, wherein the image light projected and displayed on the image display side of the screen by the image projection device is turned back to the viewing position by the concave mirror. 5. The image display device using a concave mirror according to claim 1, wherein the image light projected by the image projection device is once folded by the concave mirror and projected and displayed on the screen. 2. The mirror according to claim 1, wherein an image light projected by the image projection device is provided so that the image light projected by the image projection device is once turned by the concave mirror to reach the screen. An image display device using a concave mirror. 3. The mirror according to claim 2, wherein the mirror is folded by the concave mirror and disposed in a path of the image light toward the viewing position, and reflects about 50% of the light, and An image display device using a concave mirror, having a function of transmitting% light. 4. The image display device using a concave mirror according to claim 1, wherein the image projection device is provided on a side of the screen opposite to the image display side.