JPH0720404A - Image display method using ellipsoidal mirror - Google Patents

Abstract

PURPOSE:To obtain an image in the entire visual field with inexpensive and simple constitution by using a general display device and the elliptic mirror. CONSTITUTION:The display device 2 is arranged nearby the position of the 1st focus F1 of the ellipsoidal mirror 5 which has its internal surface formed of a mirror so that the display surface 2a is on a plane passing the 1st and 2nd focuses F1 and F2 of the elliptic mirror 5; and an image from the display device 2 is reflected by the mirror 5a and an enlarged virtual image projected on behind the mirror 5a is observed at or nearby the position of the 2nd focus F2. This image display method can projects the image in the entire visual field of an observer 1 with the inexpensive constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display method capable of viewing an image over the entire visual field, and more particularly to an image display method using an ellipsoidal mirror.

[0002]

2. Description of the Related Art In general display devices such as TV monitors,
Since information other than the image, such as the frame of the monitor and the surrounding environment, enters the field of view, there is a drawback that it is difficult to concentrate on the image. This drawback can be solved to some extent by increasing the size of the display surface, but the flat display surface cannot cover the entire field of view, and there is a problem of installation space and cost. . On the other hand, there is a method of creating a real image or a virtual image using a concave mirror. FIG. 3 is a diagram showing an example of an image display method using a concave mirror (for example, “Delvision (delvisio) manufactured by Dentsu Prox).
n) ”). In this example, the spherical center C of the hemispherical concave mirror 3
The CRT2 is arranged so that the cathode ray tube surface 2a is located at the lower part of the upper surface, and the image 2b of the CRT2 is reflected on the concave mirror 3 so that the spherical center C
By projecting the real image 2b 'on the upper surface, the observer 1 can see the real image 2b' with a sense of depth. However, in this display method, the background needs to be black at the time of shooting and at the time of display.

This display method utilizes the principle of mirror reflection. That is, as shown in FIG. 4, as for the light emitted from the point P of the object 4, the light passing through the focal point F is reflected by the concave mirror 3 and is parallel to the OC axis connecting the mirror center O and the spherical center C. , The light reflected at the mirror point O is equiangular across the OC axis, and the light parallel to the OC axis is reflected by the concave mirror 3 and passes through the focal point F in the directions of arrows L1, L2, L3, respectively, This is based on the principle that an inverted real image 4'of the same size is formed by matching at a point P'on the upper surface of the center point C. In FIG. 4, when the object 4 is arranged on the right side of the spherical center C, the image is reduced, and when it is arranged between CFs, the image is enlarged. Further, when it is arranged between the FOs, an enlarged erecting virtual image is displayed. However, the above-mentioned Delvision display method has an advantage that a sense of depth can be felt, but in view that the outside world is included in the visual field, a display device having a general flat display surface is used. There is no change.

As an example of a method for displaying an image in the entire field of view,
There is a display method in which the display surface is a curved surface and the image is projected on the curved surface, and it is used in the Port Pia Daiei Hall held in Kobe Port Island in 1981, and at the Fujitsu Pavilion at the 1985 Tsukuba Expo. The "Omnimax method" is also included. This method is a method in which a dome-shaped screen similar to a hemispherical planetarium is installed, a projector is installed at the center of the hemisphere, and the image from the projector is projected on a spherical screen through a fisheye lens. , So that a large number of people can see the image projected in the full field of view. Further, as another example of the one capable of displaying the entire visual field of oneself, there is a so-called "head mounted display" having a goggle type display. The head-mounted display is designed so that the user wears the device on his head and sees the image in front of him, which is displayed on the liquid crystal display provided on the inner wall of the device.

[0005]

By the way, as an example of the display method capable of displaying an image in the entire field of view, the "Omnimax method" and the "head mounted display" are mentioned, but in the "Omnimax method", It has the advantage that many people can see it, but it requires the use of a fisheye lens with high precision, which makes it extremely expensive.
Then, there is a problem that it is troublesome to wear and feels to be worn, and that it is heavy and therefore a heavy burden is put on the body, and it is difficult to wear for a long time. Further, the image display method using the above-mentioned hemispherical concave mirror has an advantage that a sense of depth of the image can be felt, but there is a problem that the image cannot be displayed over the entire visual field.

The present invention has been made in view of the above problems, and an object of the present invention is to use an ordinary display device and obtain an image over the entire visual field with an inexpensive and simple structure. An object is to provide an image display method using a mirror.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an image display method using an ellipsoidal mirror, and the above object of the present invention is to provide a first focus of an ellipsoidal mirror having an inner surface formed by a mirror. The display device is arranged so that the display surface is near the position and on the surface passing through the first and second focal points of the ellipsoidal mirror, and the image from the display device is reflected on the mirror, This is achieved by making it possible to observe the magnified virtual image projected behind the mirror at or near the position of the two focal points. Further, the above ellipsoidal mirror is achieved by using an ellipsoidal mirror in which a mirror portion is formed in a range including the entire visual field.

[0008]

In the present invention, the display device is arranged at one of two focal points of the ellipsoidal mirror whose inner surface is formed by the mirror.
By projecting the image from the display device onto the mirror, the magnified image over the entire field of view can be seen at the other focus. Moreover, since the virtual image is projected on the mirror, it is possible to see a deep image even in a narrow space.

[0009]

Embodiments of the image display method using the ellipsoidal mirror of the present invention will be described below with reference to the drawings. Figure 1
(A) is a conceptual diagram showing a configuration example of a display system that realizes an image display method using an ellipsoidal mirror of the present invention, (B) is a view from above, (C) is the same. It is the figure seen from the AA line arrow direction. The display surface 2a is located at the position of the first focal point F1 of the semi-ellipsoidal mirror 5 whose inner surface is formed by a mirror and on the surface passing through the first and second focal points F1 and F2 of the semi-ellipsoidal mirror 5.
The display device 2 is disposed so that the image comes from the display device 2 and the image from the display device 2 is reflected by the mirror 5a, and an enlarged virtual image displayed behind the mirror 5a is displayed at or near the position of the second focus F2. Make it observable. This allows the observer 1
Can see an image spread over a field of view of almost 180 °.

In the example shown in the figure, a semi-ellipsoidal ellipsoidal mirror cut along a plane passing through the long axis is used, but the shape of the ellipsoidal mirror is not limited to this.
The size of the field of view is limited by the eyelids and nose, and the normal Japanese viewing angle is about 100 ° to the left and right, about 70 ° to the top, and about 70 ° to the bottom. Therefore, if an ellipsoidal mirror in which the mirror portion is formed in the range including the entire visual field is used so that an image over the entire visual field can be obtained at or near the position of the second focus F2. good. The eccentricity of the ellipsoidal mirror 5 and the length of the long axis may be set according to the application of the display system.

FIG. 2 is a diagram showing an image display operation according to the method of the present invention and a principle of displaying an image over the entire visual field. Since all the light emitted from the focus F1 is focused on the focus F2, The light emitted from the display surface 2a on the front side (on the side of the ellipsoidal mirror) is also reflected by the mirror 5a and gathered at the focal point F2, as shown by the paths R1 and R2 in the figure, and the position behind the mirror 5a.
An upright virtual image enlarged in 5b is created. Therefore the focus
When observed in the vicinity of the position of F2, the observer's eyes see this enlarged erecting virtual image, and can see the image spread over the entire mirror 5a. In the example of the semi-ellipsoidal ellipsoidal mirror 5 in the same figure, an image is obtained which is developed about 90 ° left and right, about 90 ° above, and about 90 ° below with respect to the line of sight. Here, the display device 2 is not limited to a general TV monitor, and a projector or a laser type projector can be used to obtain the same effect.

[0012]

As described above, according to the image display method using the ellipsoidal mirror of the present invention, an image can be displayed over the entire visual field without using a lens system such as a fisheye lens. Furthermore, since a general display device can be used as the display means, a display system capable of displaying an image in the entire visual field can be realized with an inexpensive structure. In addition, since the outside world does not enter the observer's eyes, the sense of reality and realism increases, and when applied to a space game or a driving game, for example,
You will be able to enjoy a powerful game full of speed. Further, since the observer sees the enlarged virtual image behind the ellipsoidal mirror, there is an advantage that the apparent distance from the observer to the virtual image can be long. Therefore, a large image can be displayed without increasing the actual depth distance of the display system, and space can be saved.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a configuration example of a display system that realizes an image display method using an ellipsoidal mirror of the present invention.

FIG. 2 is a diagram for explaining an image display operation by the method of the present invention and a principle of displaying an image over the entire visual field.

FIG. 3 is a diagram showing an example of a conventional image display method using a concave mirror.

FIG. 4 is a diagram showing a principle of a projection operation in a conventional image display method using a concave mirror.

[Explanation of symbols]

 2 display device 2a display surface 5 ellipsoidal mirror 5a mirror F1 first focus of ellipsoidal mirror F2 second focus of ellipsoidal mirror

Claims (2)

[Claims] 1. A display surface is located near a position of a first focal point of an ellipsoidal mirror having an inner surface formed of a mirror, and on a surface passing through the first and second focal points of the ellipsoidal mirror. , A display device is arranged, an image from the display device is reflected on the mirror, and at or near the position of the second focal point,
An image display method using an ellipsoidal mirror, characterized in that a magnified virtual image displayed behind the mirror can be observed. 2. The image display method using the ellipsoidal mirror according to claim 1, wherein the ellipsoidal mirror uses an ellipsoidal mirror in which a mirror portion is formed in a range including the entire visual field.