JPH0456514B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a stereoscopic image device used to obtain stereoscopic images using, for example, a cathode ray tube as an image plane.

[Conventional technology]

The second one shows this kind of conventional 3D image device.
In this figure, for example, the right cathode ray tube 1, which is the right image plane on which images for the right eye are projected, is arranged so as to be approximately directly opposite to the viewing direction, and the other left cathode ray tube 2 is arranged orthogonally, that is, in this example, to the left. They are arranged so that the image plane faces upward, and a right polarizing plate 3 is arranged in front of each of the cathode ray tubes 1 and 2 so that, for example, the polarization axis is perpendicular to the right image plane of the right cathode ray tube 1. The left polarizing plate 4 is arranged so that its polarization axis is horizontal to the left image plane of the left cathode ray tube 2. In other words, each polarizing plate 4 is arranged so that its polarization axis is perpendicular to the left image plane of the left cathode ray tube 2, and By arranging a semi-transmissive mirror 5 at an angle of approximately 45° equidistant in front of the cathode ray tube 1 and the left cathode ray tube 2, the left and right image planes are synthesized so that they are viewed at approximately the same position. When viewing a surface, the viewer uses a right viewing polarizing plate 26 having a polarization axis in the same direction as the right polarizing plate 3, that is, in a vertical direction;
By passing the left viewing polarizing plate 27 which has a polarization axis in the same direction as the left polarizing plate 4, that is, the horizontal direction, into a pair of glasses, the image on the right cathode ray tube 1 is visible only to the viewer's right eye. Similarly, the image on the left cathode ray tube 2 reaches only the left eye of the viewer, and thus a stereoscopic image is viewed.

[Problem to be solved by the invention]

The conventional method described above is basically the same as that used when showing 3D movies, and produces good results when viewed while sitting in a chair and at least with the head upright, as in a theater. This is the method that can be obtained. However, devices with small image planes, such as cathode ray tubes, are generally viewed at home, and in this case, they are not necessarily viewed under the conditions described above, such as while lying down. In this case, crosstalk between the left and right image planes, and in extreme cases, the left and right images are swapped, creating the problem that the correct stereoscopic image cannot be viewed in a comfortable posture.Solving this problem is an issue. It was hot.

[Means to solve the problem]

The present invention provides a pair of image planes in which one image plane faces the viewing direction and the other image plane is orthogonal to the one image plane; a polarizing plate disposed in front of each of the image planes so that their respective polarization axes are perpendicular to each other; a semi-transmissive mirror that combines the pair of image planes at approximately the same position; In a stereoscopic imaging device comprising a pair of polarizing plates for viewing, each of which is placed in the line of sight, the semi-transmissive mirror has a polarizing axis tilted at 45 degrees with respect to each of the polarizing plates on the viewing direction side. 1/4
To provide a three-dimensional image device characterized in that a λ wavelength plate is disposed, and one of the polarizing plates for viewing is a left-handed circularly polarizing plate and the other is a right-handed circularly polarizing plate. This method solves the above-mentioned conventional problems by providing a three-dimensional effect regardless of the viewing posture.

【Example】

Next, the present invention will be explained in detail based on an embodiment shown in the drawings. In order to facilitate understanding, parts that are the same as those in the conventional example will be described with the same reference numerals, and descriptions of some overlapping parts will be omitted. For example, what is indicated by the reference numeral 1 in FIG.
is provided directly facing the viewing direction, and a left cathode ray tube 2 is arranged so that its image plane is perpendicular to the right cathode ray tube 1, and furthermore, a left cathode ray tube 2 is arranged so that its image plane is orthogonal to the right cathode ray tube 1, and furthermore, a left cathode ray tube 2 is arranged so that its polarization axis is orthogonal to the front of each cathode ray tube 1, 2. Polarizing plates 3 and 4 are provided, and the image planes of these cathode ray tubes 1 and 2 are combined by a semi-transmissive mirror 5, as in the conventional example.
According to the present invention, a λ1/4λ wavelength plate 6 with a polarization axis set at 45° is provided on the viewing direction side of the semi-transmissive mirror 5 for each of the right polarizing plate 3 and the left polarizing plate 4, as shown in the figure. The right viewing polarizing plate 7 is a right-handed circularly polarizing plate and is placed in the viewer's right eye LE line of sight, and the left viewing polarizing plate 8 is likewise a left-handed circularly polarizing plate. It is placed, for example, in the shape of a spectacle in the RE line of sight of the viewer's left eye. To explain the operation of the stereoscopic image device of the present invention, the right image reflected on the right cathode ray tube 1 passes through the right polarizing plate and receives linearly polarized light in the direction perpendicular to the image plane. When this image passes through the 1/4λ wavelength plate 6, the vertically linearly polarized light is converted into right-handed circularly polarized light, and the left image reflected on the left cathode ray tube 2 passes through the left polarizing plate. As a result, it receives linearly polarized light in the horizontal direction with respect to the image plane, and when it passes through the 1/4λ wavelength plate 6, it is converted into left-handed circularly polarized light. Here, since the right-handed viewing polarizing plate 7 is a right-handed circularly polarizing plate, only the right-handed circularly polarized light, that is, the right image reflected on the right cathode ray tube 1 among the left and right images, is transmitted to the viewer. Similarly, the left cathode ray tube 2 is viewed using the left viewing polarizing plate 8.
The left eye RE views only the left image reflected in the image, and as a result, a stereoscopic image is viewed. Here, to explain the special effect of the present invention, by using circularly polarized light as explained above, it is no longer necessary to match the polarization axes between the image emitting side and the viewing side, and the rotation direction matches. Since the left and right images are selected separately, it is not affected by changes in the viewer's posture, such as when the viewer is lying down.

【Effect of the invention】

As explained above, according to the present invention, images of left and right linearly polarized light having orthogonal polarization axes can be converted into 1/4λ images having polarization axes at an angle of 45° with the respective polarization axes.
By transmitting it through a wave plate, the light is converted into circularly polarized light with the opposite direction of rotation, and this is viewed through a circularly polarizing plate with a corresponding direction of rotation. By eliminating the influence on the performance of separating and selecting left and right images, and by making it possible to view clear 3D images without crosstalk in any viewing position, this type of 3D imaging device can be used in a wide range of applications, including home use. It has the extremely excellent effect of making it possible to use it easily and dramatically increasing its practicality and versatility.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a stereoscopic imaging device according to the present invention, and FIG. 2 is a schematic perspective view showing a conventional example. 1...Right cathode ray tube, 2...Left cathode ray tube, 3
...Right polarizing plate, 4...Left polarizing plate, 5...Semi-transmissive mirror, 6...1/4λ wavelength plate, 7...Right viewing polarizing plate,
8...Polarizing plate for left viewing.

Claims (1)

[Claims] 1 A pair of image planes, one image plane facing the viewing direction and the other image plane orthogonal to said one image plane, and each polarization axis being perpendicular to the front surface of said respective image plane. A semi-transparent mirror that combines the pair of image planes at substantially the same position, and a pair of polarizing plates for viewing that are placed in the left and right line of sight of the viewer, respectively. In the stereoscopic imaging device, a 1/4λ wavelength plate whose polarization axis is tilted at 45 degrees with respect to each of the polarizing plates is disposed on the viewing direction side of the semi-transmissive mirror, and the viewing polarizing plate is on one side. A stereoscopic imaging device characterized in that one is a left-handed circularly polarizing plate and the other is a right-handed circularly polarizing plate.