JP2001125506A - Stereoscopic image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic image display device which is capable of displaying stereoscopic images floating in the air in front of an observer and displaying plane images as well. SOLUTION: A CRT 2 which is a first image generator is arranged with a screen 4 which generates a first image 3 so as to face a concave mirror 1 at a distance (r) twice the focal length r/2 of a concave mirror 1 or near the distance (r) twice the same. A beam splitter 5 is arranged between the concave mirror 1 and the CRT 2 which is the first image generator so as to incline nearly 450 with the opposite axes of the concave mirror 1 and the CRT 2 which is the first image generator. A CRT 6 which is a second image generator is arranged in a direction perpendicular to the opposite axes so as to face an observer 7 via the beam splitter 5 and generates a second image 8. The first image 3 is made incident on the concave mirror 1 through the beam splitter 5 and is reflected toward the beam splitter 5. The first image 3 is further reflected toward the observer 7 by the beam splitter 5 and is displayed floating in the air as the stereoscopic image 8. The second image 8 is transmitted through the beam splitter 5 toward the observer 7 and is displayed as the plane image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional image display device having two image generating devices such as a CRT and displaying a three-dimensional image and a two-dimensional image.

[0002]

2. Description of the Related Art Conventionally, concave mirrors, beam splitters and
As a stereoscopic image display device including an image generation device such as a CRT, for example, Utility Model Registration Publication No. 2502767
No. has been proposed. In this prior art example, as shown in FIG. 5, a CRT 2 which is a first image generating device for generating a first image 3 has a screen 4 whose focal length r / 2 of a concave mirror 1 having a concave surface 1a. An observer 7 faces a CRT 6, which is a second image generating device that is arranged in the vicinity and generates a second image 8, via a beam splitter 5.

[0003]

However, in the above-described conventional example, the CRT 2 as the first image generating device has a screen 4 arranged near the focal length r / 2 of the concave mirror 1 so that observation is not possible. Person 7 has first image 3 generated from CRT 2
Seemed to be located at an almost infinite distance. Therefore, the configuration is not suitable for displaying a stereoscopic image in the air in front of the observer 7. Therefore, an object of the present invention is to provide a three-dimensional image display device that can display a three-dimensional image floating in the air in front of the observer and also display a planar image to the observer.

[0004]

According to a first aspect of the present invention, there is provided a concave mirror having a concave surface for reflecting a light beam, and a distance opposed to the concave mirror, which is twice as long as the focal length of the concave mirror or twice as long. A first image generating device in which a screen for generating a first image is disposed in the vicinity of the first image generating device, and the first image generating device is inclined at approximately 45 degrees with respect to an axis facing the concave mirror and the first image generating device. A beam splitter disposed between the concave mirror and the first image generating device; and a beam splitter that is disposed in a direction perpendicular to the opposing axis to face an observer via the beam splitter and generate a second image. A second image generator, wherein the first image passes through the beam splitter and is incident on the concave mirror, and is further reflected toward the beam splitter, wherein the first image is further For beam splitter Ri is reflected towards the observer, appear floating in the air as a stereoscopic image, the second
Is passed through the beam splitter toward the observer, and is displayed as a planar image.

According to a second aspect of the present invention, the first image generating device and the second image generating device are any one of a CRT, a liquid crystal display device, a plasma display device, a decorative light, or a real object. Item 3. A stereoscopic image display device according to item 1. According to a third aspect of the present invention, a quarter-wave plate that causes a phase difference in the vibration direction of the incident light beam is orthogonal to the opposing axis and between the concave mirror and the beam splitter. 3. The stereoscopic image display according to claim 1, wherein a polarizing plate arranged and configured to polarize an incident light beam is arranged in parallel with the opposite axis and between the beam splitter and the observer. Device. According to a fourth aspect of the present invention, a quarter-wave plate for generating a phase difference in the vibration direction of the incident light beam is attached to the observer-side surface of the beam splitter, and polarizes the incident light beam. 3. The stereoscopic image display device according to claim 1, wherein a plate is disposed parallel to the opposing axis and between the beam splitter and the observer. 4.

According to a fifth aspect of the present invention, a quarter-wave plate for generating a phase difference in a vibration direction of an incident light beam is provided in parallel with the opposite axis, and the beam splitter and the observer. 3. The stereoscopic image display device according to claim 1, wherein a polarizing plate disposed between the first and second wavelength plates and polarizing the incident light beam is attached to a surface of the quarter-wave plate on the viewer side. 4. According to a sixth aspect of the present invention, the surface of the quarter-wave plate and the polarizing plate is provided with a coating for reducing light reflection, or a film for reducing the light reflection is attached. 6. The stereoscopic image display device according to any one of items 1 to 5,

According to the first aspect of the present invention, as shown in FIG. 1, the CRT 2 serving as the first image generating device faces the concave mirror 1 and is twice the focal length r / 2 of the concave mirror 1. The screen 4 for generating the first image 3 is arranged near the distance r or twice the distance r. Therefore, the first image 3 passes through the beam splitter 5 and is incident on the concave mirror 1, and is further reflected toward the beam splitter 5, and the first image 3 is further directed to the observer 7 by the beam splitter 5. And is displayed as a three-dimensional image 9 floating in the air. In other words, the screen 4 for generating the first image 3 is arranged near the distance r twice or twice the focal length r / 2 of the concave mirror 1, and the concave mirror 1 and the first image generating device use the screen 4. Since the distance of a certain CRT 2 is sufficiently maintained, the first image 3 is displayed in the air as a stereoscopic image 9 in front of the observer 7. Further, a second image 9 generated by the CRT 6 as a second image generating device is
, And passes through the beam splitter 5 to be displayed as a planar image.

According to the second aspect of the present invention, the first image generating device and the second image generating device include not only CRTs 2 and 6, but also a liquid crystal display device, a plasma display device, a decorative light, a real object, or the like. Are not limited to these as long as they generate images, and various images can be displayed. According to the third aspect of the present invention, as shown in FIG. 2, the quarter-wave plate 10 for generating a phase difference in the vibration direction of the incident light beam is orthogonal to the opposite axis, and It is arranged between the concave mirror 1 and the beam splitter 5. Further, a polarizing plate 11 that polarizes the incident light beam is disposed parallel to the opposite axis and between the beam splitter 5 and the observer 7. For this reason,
Light rays from the three-dimensional image 9 formed in the external space and other external light sources pass through the polarizing plate 11 and enter, for example, horizontally polarized. Next, for the ray path, 45
The beam passes through the beam splitter 5 inclined at an angle. Next, the horizontally polarized light beam passes through the quarter-wave plate 10, and generates a phase difference in the vibration direction of the light beam, and rotates clockwise. The right-rotated light beam is reflected by the concave mirror 1 and is polarized to the left. The left-handed polarized light then passes through the quarter-wave plate 10 again, and further produces a phase difference in the direction of oscillation, resulting in a left-handed, vertically polarized light. The vertically polarized light beam again passes through the beam splitter 5 inclined at 45 degrees, and becomes a vertically polarized light beam. Next, the vertically polarized light beam is blocked by the horizontally polarizing polarizer 11 and the light beam is
%, That is, deleted. For this reason, the ghost generated by the entering light beam from the stereoscopic image 9 formed in the external space and other external light sources is sufficiently eliminated. As a result, the stereoscopic image 9 formed in the external space
Can be more clearly seen by the observer 7.

According to the present invention, as shown in FIG. 3, the quarter-wave plate 10 for generating a phase difference in the vibration direction of the incident light beam is provided on the observer 7 side of the beam splitter 5. Affixed to the surface of Further, a polarizing plate 11 that polarizes the incident light beam is disposed parallel to the opposite axis and between the beam splitter 5 and the observer 7. For this reason, for the same reason as in the third aspect of the invention, the ghost caused by the entering light beam from the stereoscopic image 9 formed in the external space and other external light sources is sufficiently eliminated. As a result, the observer 7 can see the stereoscopic image 9 formed in the external space more clearly. According to the fifth aspect of the present invention, as shown in FIG. 4, a quarter-wave plate 1 for producing a phase difference in the vibration direction of an incident light beam.
0 is arranged between the beam splitter 5 and the observer 7 in parallel with the opposite axis. Further, the polarizing plate 11 for polarizing the incident light is a quarter-wave plate 10.
On the surface of the observer 7 side. For this reason, for the same reason as in the third aspect of the invention, the ghost caused by the entering light beam from the stereoscopic image 9 formed in the external space and other external light sources is sufficiently eliminated. As a result, the observer 7 can see the stereoscopic image 9 formed in the external space more clearly. According to the present invention of claim 6, 1 /
The surface of the four-wavelength plate 10 and the polarizing plate 11 is coated with a coating that reduces the reflection of light rays, or a film that reduces the reflection of light rays is attached, so that ghosts can be further eliminated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on its embodiments with reference to the drawings. The concave mirror 1
It has a concave surface 1a that reflects light rays. A CRT 2 as a first image generating device faces the concave mirror 1,
This is a device in which a screen 4 for generating the first image 3 is arranged near a distance r twice or twice the focal length r / 2 of the concave mirror 1. The beam splitter 5 includes the concave mirror 1
It is disposed between the concave mirror 1 and the first image generating device CRT2 at an angle of approximately 45 degrees with respect to the axis facing the first image generating device CRT2. Second
CRT 6 is a beam splitter 5
This is a device that is arranged in the direction perpendicular to the opposing axis and faces the observer 7 via the.

The first image generation device and the second image generation device include not only CRTs 2 and 6, but also a liquid crystal display device, a plasma display device, a decorative light, or real objects, and generate images. If there is, it is not limited to these. Here, the first image 3 passes through the beam splitter 5, enters the concave mirror 1, and is further reflected toward the beam splitter 5. First image 3
Is further reflected by the beam splitter 5 toward the observer 7 and displayed as a stereoscopic image 9 in the air. Further, the second image 8 passes through the beam splitter 5 toward the observer 7 and is displayed as a planar image.

Next, FIG. 2 shows another embodiment of the present invention. A quarter-wave plate 10 that causes a phase difference in the vibration direction of the incident light beam is disposed orthogonal to the opposing axis and between the concave mirror 1 and the beam splitter 5. Further, a polarizing plate 11 that polarizes the incident light beam is disposed parallel to the opposite axis and between the beam splitter 5 and the observer 7. Next, FIG.
Shows another embodiment of the present invention. Quarter-wave plate 1 that causes a phase difference in the vibration direction of the incident light beam
0 is affixed to the surface of the beam splitter 5 on the observer 7 side. Further, a polarizing plate 11 for polarizing the incident light beam
Are arranged between the beam splitter 5 and the observer 7 in parallel with the opposing axis.

Next, FIG. 4 shows another embodiment of the present invention. A 波長 wavelength plate 10 that causes a phase difference in the vibration direction of the incident light beam is disposed parallel to the opposing axis and between the beam splitter 5 and the observer 7. Further, a polarizing plate 11 for polarizing the incident light beam is attached to the surface of the quarter-wave plate 10 on the observer 7 side. Here, in the embodiment shown in FIGS. 2 to 4, the surfaces of the 波長 wavelength plate 10 and the polarizing plate 11 are coated with a coating that reduces light reflection, or
Preferably, a film that reduces the reflection of light is applied.

[0014]

As described above, the present invention has the effect of displaying a stereoscopic image in the air in front of the observer and displaying a planar image to the observer.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of another embodiment of the present invention.

FIG. 3 is a configuration diagram of another embodiment of the present invention.

FIG. 4 is a configuration diagram of another embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Concave mirror 2 CRT 1a which is a 1st imaging device
Concave surface 3 First image 4 Screen 5 Beam splitter 6 CRT as second image device 7 Observer 8 Second
Image 9 3D image 10 1/4 wavelength plate 11 Polarizing plate

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C061 AB11 AB16 AB18 AB24 5G435 BB02 CC11 GG01 GG09

Claims (6)

[Claims] 1. A concave mirror having a concave surface for reflecting a light beam, and a screen for generating a first image opposite to the concave mirror at a distance twice or near the double distance of a focal length of the concave mirror. A first image generating device in which the concave mirror and the first image generating device are inclined at an angle of approximately 45 degrees with respect to an opposing axis of the concave mirror and the first image generating device. A beam splitter, and a second image generating device that is disposed in a direction perpendicular to the opposing axis and faces a viewer via the beam splitter, and that generates a second image, A first image passes through the beam splitter and is incident on the concave mirror, and is further reflected toward the beam splitter, wherein the first image is further reflected toward the observer by the beam splitter, Appear floating in the air as the body image, the second image is passed through the beam splitter toward the observer, the stereoscopic image display apparatus characterized by being displayed as a planar image. 2. The three-dimensional image according to claim 1, wherein the first image generating device and the second image generating device are any one of a CRT, a liquid crystal display device, a plasma display device, a decorative light, and a real object. Display device. A quarter-wave plate for producing a phase difference in the direction of oscillation of the incident light beam,
And, a polarizing plate disposed between the concave mirror and the beam splitter, for polarizing incident light, is disposed parallel to the opposite axis, and between the beam splitter and the observer. The three-dimensional image display device according to claim 1 or 2, wherein: 4. A quarter-wave plate for producing a phase difference in the vibration direction of an incident light beam is attached to a surface of the beam splitter on the observer side, and a polarizing plate for polarizing an incident light beam is provided. The three-dimensional image display device according to claim 1, wherein the three-dimensional image display device is disposed parallel to the opposing axis and between the beam splitter and the observer. 5. A quarter-wave plate for causing a phase difference in a vibration direction of an incident light beam is disposed parallel to the opposite axis and between the beam splitter and the observer. A polarizing plate for polarizing an incident light beam is attached to a surface of the quarter-wave plate on the observer side.
Or the stereoscopic image display device according to 2. 6. The method according to claim 3, wherein a surface of said quarter-wave plate and said polarizing plate is coated with a coating for reducing light reflection, or a film for reducing the reflection of light is applied. The stereoscopic image display device according to any one of the above.