JPH07261087A - Video display device - Google Patents

Abstract

PURPOSE:To provide a video display device giving capable of perspective feeling so that a viewer feels a peripheral video as a short-range view and a center-part video as a distant view to the viewer. CONSTITUTION:A transmission screen 2A is provided with curvature and the projecting surface side thereof is opposed to a concave mirror 1. Besides, the radius of the curvature (y) thereof is larger than or equal to the radius of the curvature (x) of the mirror 1(x<=y). The screen 2A is arranged at such a position that a distance to the mirror 1 becomes shorter than the focal distance of the mirror 1. A distance (b) to the mirror 1 from the peripheral part of the screen 2A is short in comparison with a distance (a) to the mirror 1 from the central part of the screen 2A. A video from a projection device 3 is formed on the screen 2A and viewed by the viewer 21 through the mirror 1.

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 capable of viewing an image of an image source as a virtual image through a reflecting mirror, and is particularly used as a game machine, an audiovisual machine and various simulation machines. The present invention relates to a video display device which is suitable for use, and which is full of realism and rich in entertainment.

[0002]

2. Description of the Related Art As an image display device capable of observing an image from an image source as a virtual image reflected on a reflecting mirror, for example, a flight simulator (engineer 274, P.P78
~ 80, 1991.5. Extra issue).

FIG. 6 is a sectional view schematically showing the structure of a flight simulator as a conventional image display device.
The flight simulator is basically a transparent screen 2.
And an image source 4 including a projection device 3 and a concave mirror 1. The transmissive screen 2 has a curvature, and the convex surface side of the transmissive screen 2 faces the concave mirror 1. A light beam from the projection device 3 is imaged on the transmissive screen 2, and the image projected on the transmissive screen 2 is converted into a concave mirror 1.
The viewer 21 feels that the image is distant (infinity) by seeing through, and the viewer 21 feels as if he / she were on an airplane.

Also, as described in Japanese Utility Model Laid-Open No. 5-21067, a video display device using a reflective screen instead of the transmissive screen 2 has been devised.

[0005]

In the conventional image display device described above, the image of the image source 4 can be magnified by the concave mirror 1 and viewed as a distant image. However, not only distant objects but also those at short range are included in the human visual field.

[0006] On the other hand, in paintings, the peripheral part should be a close view.
There is a method of giving a perspective and a pseudo three-dimensional effect to the painting itself by making the central part a distant view.

Therefore, an object of the present invention is to provide an image display device capable of not only giving a pseudo-stereoscopic effect but also giving a peripheral image to a near view and a central image to a distant view. is there.

[0008]

In order to achieve the above object, according to the present invention, an image source for displaying an image on an image display surface and a light emitted from the image display surface of the image source are reflected. A concave mirror that magnifies the image projected on the image display surface, wherein the image display surface of the image source has a distance from a peripheral portion of the image display surface to the concave mirror. The curvature is such that it is shorter than the distance from the central portion of the surface to the concave mirror.

For example, the image display surface of the image source is convex toward the concave mirror side, the radius of curvature thereof is larger than or equal to the radius of curvature of the concave mirror, and the distance to the concave mirror is larger than the focal length of the concave mirror. shorten. Alternatively, the image display surface of the image source is concave toward the concave mirror side, and the distance to the concave mirror is shorter than the focal length of the concave mirror.

[0010]

According to the present invention, the image display surface of the image source has a curvature such that the distance from the peripheral portion of the image display surface to the concave mirror is shorter than the distance from the central portion of the image display surface to the concave mirror. There is. Therefore, in the above-described conventional image display device, since the distance from the peripheral portion on the image display surface to the concave mirror and the distance from the central portion on the image display surface to the concave mirror are almost equal, the image that can be seen through the concave mirror is However, in the present invention, the distance from the peripheral portion on the image display surface to the concave mirror is shorter than the distance from the central portion on the image display surface to the concave mirror, though it only looks as if it is at infinity. Of the images that can be viewed through the concave mirror, the peripheral image on the image display surface can be viewed as if it is closer than the central image on the image display surface.

[0011]

1 is a sectional view schematically showing the structure of an image display apparatus as a first embodiment of the present invention. In this embodiment, the image source 4A and the concave mirror 1 are included. The image source 4A is composed of the transmissive screen 2A and the projection device 3, that is, the image display portion of the image source 4A is the transmissive screen 2A.

As shown in FIG. 1, the transmissive screen 2A has a curvature, the convex side of the transmissive screen 2A faces the concave mirror 1, and the radius of curvature y of the transmissive screen 2A is larger than the radius of curvature x of the concave mirror 1. Equal (x ≦ y). The transmissive screen 2A is arranged at a position where the distance from the transmissive screen 2A to the concave mirror 1 is shorter than the focal length of the concave mirror 1. Note that the transmissive screen 2A can form an image from the projection device 3, can transmit the image to the concave mirror 1 side of the transmissive screen 2A, and is a screen having the above-described radius of curvature,
There is no problem in the performance of the present invention. For example, the performance of the present invention is not impaired even if the surface of a plate made of transparent polymethylmethacrylic resin having a curvature is roughened with sandpaper or the like. However, a transparent screen having a surface coated with a diffusing agent is preferable.

The projection device 3 is composed of a liquid crystal projector, a projection tube projector, a laser projector or the like, but the present embodiment is not limited to this, and may be any device that can project an image on the transmissive screen 2A. Absent. However, a projection device having a high resolution is preferable.
Further, in the case of a projection tube projector, a 3-tube 1-lens type is preferable because color deviation of an image hardly occurs.

The concave mirror 1 may have any curvature as long as it has a substantially uniform curvature and has an effect as a mirror. For example,
The material is a transparent plastic such as polymethylmethacryl resin or polycarbonate resin, glass, or the like that is metal-deposited or plated, and the performance of the present invention is satisfied.

In the present embodiment, the image from the projection device 3 is imaged on the transmissive screen 2A, and the imaged image can be viewed by the viewer 21 through the concave mirror 1. That is, since the viewer 21 views the image through the concave mirror 1, the magnified virtual image 13 is generated by the lens effect of the concave mirror 1.
You can enjoy A. In particular, since the transmissive screen 2A has a curvature and the radius of curvature y of the transmissive screen 2A is greater than or equal to the radius of curvature x of the concave mirror 1, the distance b from the peripheral portion of the transmissive screen 2A to the concave mirror 1 is equal to that of the transmissive screen 2. The distance is shorter than the distance a from the central portion to the concave mirror 1. Therefore, the virtual image 13A that can be seen by the viewer 21 can be felt as if the peripheral portion is in the near view and the central portion is in the distant view.

FIG. 2 is a sectional view schematically showing the structure of an image display device as a second embodiment of the present invention. In this embodiment, the image source 4B and the concave mirror 1 are included. The image source 4B is composed of the transmission screen 2B and the projection device 3, that is, the image display portion of the image source 4B is the transmission screen 2B.

As shown in FIG. 2, the transmission screen 2B has a curvature, and the concave surface side of the transmission screen 2B faces the concave mirror 1. And the transmissive screen 2B is
The distance from the transmissive screen 2B to the concave mirror 1 is the concave mirror 1.
It is located at a position shorter than the focal length of. In addition,
The transmissive screen 2B can form an image from the projection device 3, can transmit the image to the concave mirror 1 side of the transmissive screen 2B, and any material can be used as long as the screen has a curvature. For example, the surface of a plate made of transparent polymethylmethacrylic resin having a curvature may be roughened with sandpaper or the like. However, a transparent screen having a surface coated with a diffusing agent is preferable.

The projection device 3 is composed of a liquid crystal projector, a projection tube projector, a laser projector or the like, but the present embodiment is not limited to this, and may be any device that can project an image on the transmissive screen 2A. Absent. In the case of a projection tube projector, a 3-tube 1-lens type is preferable because color deviation of an image hardly occurs.

The concave mirror 1 may have any curvature as long as it has a substantially uniform curvature and has an effect as a mirror. For example,
The material is a transparent plastic such as polymethylmethacryl resin or polycarbonate resin, glass, or the like that is metal-deposited or plated, and the performance of the present invention is satisfied.

In this embodiment, the image from the projection device 3 is formed on the transmission screen 2B, and the formed image can be viewed by the viewer 21 through the concave mirror 1. That is, since the viewer 21 views the image through the concave mirror 1, the magnified virtual image 13 is generated by the lens effect of the concave mirror 1.
You can enjoy B. In particular, since the transmissive screen 2B has a curvature and the concave surface side of the transmissive screen 2 faces the concave mirror 1, the distance d from the peripheral portion of the transmissive screen 2B to the concave mirror 1 is from the central portion of the transmissive screen 2B to the concave mirror 1. Is shorter than the distance c up to. Therefore, the virtual image 13B that can be seen by the viewer 21 can be felt as if the peripheral portion is in the near view and the central portion is in the distant view.

FIG. 3 shows a specific example of the video display device shown in FIG. In FIG. 3, the concave mirror 1 has a size of about φ.
At 1 m, the focal length is about 3 m. Transparent screen 2B
Is a hemisphere having a diameter of about 1 m, and the distance p from the concave mirror 1 to the transmissive screen 2B is about 1.5 m. The projection device 3 is a liquid crystal projector, and the distance q from the concave mirror 1 to the projection device 3 is about 3 m. Further, the viewer 21 is located at a position approximately 3 m from the concave mirror 1.

The image from the projection device 3 is imaged on the transmissive screen 2B. At this time, the size of the image when the flat plate is placed on the point O at the substantially center of the transmissive screen 2B is about 30 inches diagonally. On the other hand, the viewer 21 can see the image projected on the transmissive screen 2B from the projection device 3 over substantially the entire surface of the concave mirror 1. Moreover, the image can be perceived as if the peripheral portion is a near view and the central portion is a distant view.

It should be noted that the above is a specific example, and even if the concave mirror 1 is enlarged or the curvature is changed, the transmissive screen 2B is formed.
Needless to say, even if the size, distance, position of the viewer 21, the projection device 3, and the like are changed, the same effect can be given to the viewer. By the way, FIG. 1 or FIG.
In the embodiment shown in FIG. 3, the image sources 4A and 4B are the image sources of the type in which the image is projected on the image transmission screen, which is composed of the transmission screens 2A and 2B and the projection device 3. It may be a video source of a type that directly projects, for example, a liquid crystal panel display, a plasma display or a cathode ray tube display. That is, in such a display, the display surface on which an image is displayed has a curvature such that it becomes a convex surface, like the transmissive screen 2A shown in FIG. 1, and the radius of curvature is greater than the radius of curvature x of the concave mirror 1. If it is made larger or equal, or if the display surface on which an image is displayed is made to have a concave curvature like the transmissive screen 2B shown in FIG. The same effect as the embodiment can be obtained.

In short, as the image source 4, whether the image display surface (that is, the image display surface) is a screen surface or a display surface, the image display surface is a convex surface. The effect of the present invention can be obtained as long as it has a curvature and its radius of curvature is larger than or equal to the radius of curvature x of the concave mirror 1 or has such a curvature that the image display surface becomes a concave surface. it can.

FIG. 4 is a sectional view schematically showing the construction of an image display device as a third embodiment of the present invention. 4, the same components as those in FIG. 1 are designated by the same reference numerals. In this embodiment, a reflective screen 5A is used instead of the transmissive screen 2A shown in FIG.

As shown in FIG. 4, the reflection screen 5A
Has a curvature similar to that of the transmissive screen 2A, the convex side of the reflective screen 5A faces the concave mirror 1, and the radius of curvature y'of the reflective screen 5A is greater than or equal to the radius of curvature x of the concave mirror 1 (x≤y '). The reflection screen 5A is arranged at a position where the distance from the reflection screen 5A to the concave mirror 1 is shorter than the focal length of the concave mirror 1. The reflective screen 5A may be made of any material as long as it can form an image from the projection device 3. However, a reflective screen having a reflective layer having directional characteristics in the direction of the concave mirror 1 is preferable.

The projection device 3 may be arranged at any position as long as it can display an image on the reflection screen 5A.

Also in this embodiment, the viewer 21 looks at the image on the reflection screen 5A from the projection device 3 through the concave mirror 1 so that the peripheral part looks like a near view and the central part looks like a distant view. You can see images with a sense of perspective.

FIG. 5 is a sectional view schematically showing the construction of an image display device as a fourth embodiment of the present invention. 5, the same parts as those in FIG. 2 are designated by the same reference numerals. In this embodiment, a reflective screen 5B is used instead of the transmissive screen 2B shown in FIG.

As shown in FIG. 5, the reflection screen 5B
Has a curvature similar to the transmissive screen 2B, and the concave side of the reflective screen 5B faces the concave mirror 1. The reflective screen 5B is arranged at a position where the distance from the transmissive screen 5B to the concave mirror 1 is shorter than the focal length of the concave mirror 1. The reflection screen 5B may be made of any material as long as it can form an image from the projection device 3. However, a reflective screen having a reflective layer having directional characteristics in the direction of the concave mirror 1 is preferable. The projection device 3 may be arranged at any position as long as it can display an image on the reflection screen 5A.

Also in this embodiment, the viewer 21 looks at the image on the reflection screen 5B from the projection device 3 through the concave mirror 1 so that the peripheral part looks like a near view and the central part looks like a distant view. You can see images with a sense of perspective.

[0032]

As described above, according to the present invention, on the image display surface of the image source, the distance from the peripheral portion of the image display surface to the concave mirror is shorter than the distance from the central portion of the image display surface to the concave mirror. It has a curvature that
Therefore, since the distance from the peripheral portion of the image display surface to the concave mirror is shorter than the distance from the central portion of the image display surface to the concave mirror, the peripheral portion of the image display surface of the image that can be seen through the concave mirror is displayed. The image of can be seen as if it is at a closer distance than the image at the center of the image display surface, and the peripheral image can be seen in the near view and the central image can be seen in the distant view. .

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a configuration of an image display device as a first embodiment of the present invention.

FIG. 2 is a sectional view schematically showing a configuration of an image display device as a second embodiment of the present invention.

3 is a cross-sectional view showing a specific example of the image display device shown in FIG.

FIG. 4 is a sectional view schematically showing a configuration of an image display device as a third embodiment of the present invention.

FIG. 5 is a sectional view schematically showing a configuration of an image display device as a fourth embodiment of the present invention.

FIG. 6 is a sectional view schematically showing a configuration of a conventional image display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Concave mirror, 2A, 2B ... Transmissive screen, 3 ... Projector, 4A, 4B ... Image source, 5A, 5B ... Reflective screen, 21 ... Viewer.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuhiro Onuma 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Inside Video Media Research Laboratory, Hitachi, Ltd. (72) Inventor Kiyoji Kishimoto 292 Yoshida-cho, Totsuka-ku, Yokohama Hitachi, Ltd. Visual Media Research Center

Claims (6)

[Claims] 1. A video source for projecting a video on a video display surface,
In a video display device comprising a concave mirror that enlarges a video image projected on the video display surface by reflecting light emitted from the video display surface of the video source, wherein the video display surface of the video source is An image display device having a curvature such that a distance from a peripheral portion of the image display surface to the concave mirror is shorter than a distance from a central portion of the image display surface to the concave mirror. 2. The image display device according to claim 1, wherein the image display surface of the image source is convex toward the concave mirror, and the radius of curvature thereof is larger than or equal to the radius of curvature of the concave mirror. To a shorter distance than the focal length of the concave mirror. 3. The image display device according to claim 1, wherein an image display surface of the image source is concave toward the concave mirror side, and a distance to the concave mirror is shorter than a focal length of the concave mirror. Video display device. 4. The image display device according to claim 2, wherein the image source includes a projection device that projects an image, and a screen that projects an image projected from the projection device.
And a video display surface of the video source being a screen surface of the screen. 5. The video display device according to claim 4, wherein the screen is a transmissive screen. 6. The image display device according to claim 4, wherein the screen is a reflective screen.