JPH01316090A - Three-dimensional video device - Google Patents

Abstract

PURPOSE:To easily observe three-dimensioned picture by transmitting a video of right and left linearly polarized beams having respectively orthogonal polarization axes through a 1/4lambda wavelength plate having a polarization axis forming 45 deg. with respect to each polarization axis, converting it into the vide of circularly polarized light, in which the circular direction is reverse, and using the circular polarizing plate in the corresponding circular direction. CONSTITUTION:For example, a right CRT 1 for right video surface is provided oppositely in an observing direction, and a CRT 2 is provided so that the CRT 1 and the video surface may be orthogonal to each other. Polarizing plates 3 and 4 are provided on the front surface of the CRTs 1 and 2 so as to be orthogonal to the respective polarization axes, and the video surfaces of the CRTs 1 and 2 are synthesized by a semi-transparent mirror 5. On the observation direction side of the mirror 5, a 1/4lambda wavelength plate 6 having the polarization axis forming 45 deg. with respect to a right polarizing plate 3 and a left polarizing plate 4 is provided. Here, when the video transmits the wavelength plate 6, the linearly polarized light in a vertical direction is converted into the clockwise circularly polarized light, and when the left video projected on the left CRT 2 transmits the wavelength plate 6, it is converted into the counter-clockwise circulating polarized light. A polarizing plate 7 for a right eye observes only the right image of the CRT 1 and the polarizing plate 8 for the left eye observes only the left image of the CRT 2.

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]

FIG. 2 shows a conventional stereoscopic image device of this type, in which, for example, a right cathode ray tube 1, which is a right image plane on which images for the right eye are projected, is arranged so as to face approximately directly in the viewing direction, and other One of the left cathode ray tubes 2 is arranged orthogonally, that is, in this example, the left image plane faces upward, and the front surface of each of the cathode ray tubes 1 and 2 has a polarization axis, for example, with respect to the right image plane of the right cathode ray tube 1. The right polarizing plate 3 is arranged so as to be vertical to the left image plane of the left cathode ray tube 2, and the left polarizing plate 4 is arranged so that the polarization axis is horizontal to the left image plane of the left cathode ray tube 2, that is, the respective polarization axes are perpendicular to each other. In addition, approximately 4 semi-transmissive mirrors 5 are placed equidistantly in front of the right cathode ray tube 1 and the left cathode ray tube 2.
By arranging the left and right image planes at an angle of 5 degrees, the left and right image planes are synthesized so that they are viewed at approximately the same position, and when viewing this image plane, the viewer must A right viewing polarizing plate 26 having a polarization axis in the same direction, that is, the vertical direction, and a left viewing polarizing plate 27 having a polarization axis in the same direction as the left polarizing plate 4, that is, the horizontal direction, are shaped like glasses. , the image on the right cathode ray tube 1 reaches only the right eye of the fixator, and similarly, the image on the left cathode ray tube 2 reaches only the left eye of the fixator, thereby fixating a stereoscopic image. Become something.

[Problem to be solved by the invention]

The conventional method described above is basically the same as that used when showing 3D movies, and it produces good results when the user is seated in a chair, as in a theater, and at least fixates with the head upright. This is the method that can be obtained. However, devices with small image planes, such as cathode ray tubes, are often fixated at home, and in this case, they are not necessarily fixated under the above conditions, 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 fixed in a comfortable posture.Solving this problem is an issue. It was something that

[Means for Solving the Problems] The present invention provides specific means for solving the above-described conventional problems, in which one image plane faces the fixation direction and the other image plane faces the fixation direction. a pair of image planes orthogonal to
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 consisting of a pair of polarizing plates for fixation that are respectively placed in the line of sight, the semi-transmissive mirror has a polarization axis tilted at 45 degrees with respect to each of the polarizing plates on the fixation direction side. Provided is a stereoscopic imaging device, characterized in that a 1/4λ wavelength plate is disposed, and one of the fixation polarizing plates is a left-handed circularly polarizing plate and the other is a right-handed circularly polarizing plate. By doing so, the above-mentioned conventional problems can be solved as a three-dimensional effect can be obtained regardless of the posture during fixation. [Example] Next, the present invention will be described in detail based on an example 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. The reference numeral 1 in FIG. 1 is, for example, a right cathode ray tube with a right image plane. A cathode ray tube 2 is arranged, and a polarizing plate 3.4 is arranged in front of each cathode ray tube 1.2 so that the respective polarization axes are perpendicular to each other, and the image planes of these cathode ray tubes 1.2 are combined by a semi-transparent mirror 5. However, according to the present invention, on the fixation direction side of the semi-transmissive mirror 5, a polarization axis of 45 is set for each of the right polarizing plate 3 and the left polarizing plate 4 as shown in the figure. A polarizing plate 7 for right fixation is arranged as a right-turning circularly polarizing plate and placed in the line of sight of the right eye LE of the fixator, and similarly for left fixation. The polarizing plate 8 is a left-handed circularly polarizing plate and is placed in the line of sight of the left eye RE of the fixation viewer, for example, in the shape of a pair of glasses. To explain the operation of the stereoscopic image device of the present invention, the right image projected 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 projected 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 the 1/4λ wavelength plate 6
When the light passes through it, it is converted into left-handed circularly polarized light. Here, since the right fixation polarizing plate 7 is a right-handed circularly polarizing plate, only the right-handed circularly polarized light, that is, the right image projected on the right cathode ray tube 1 among the left and right images, is transmitted through the fixation viewer. grid LE
Similarly, the left eye RE fixates only the left image projected on the left cathode ray tube 2 by the left fixation polarizing plate 8, thereby fixating a stereoscopic image. . 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 side that emits the image and the side that fixates the image, and the rotation direction matches. Since the left and right images are selected separately, it is not affected by changes in the posture of the fixation user, such as when lying down. Effects of the Invention As explained above, according to the present invention, images of left and right linearly polarized light whose polarization axes are orthogonal to each other can be
It is converted into circularly polarized light with the opposite direction of rotation by passing through a 1/4λ wavelength plate with a polarization axis at an angle of 100°, and this is fixedly viewed through a circularly polarizing plate with a corresponding direction of rotation. By doing this, the performance of separating and selecting left and right images is not affected by the posture of the fixator, and it is possible to fixate a clear stereoscopic image without crosstalk in any fixation posture. This type of stereoscopic imaging device can be easily used in a wide range of applications such as home use, and has the extremely excellent effect of dramatically increasing its practicality and versatility.

[Brief explanation of the drawing]

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-transparent mirror 6...1/4λ wavelength plate

Claims (1)

[Claims] A pair of image planes, one image plane facing directly in the viewing direction and the other image plane orthogonal to said one image plane, and arranged so that their respective polarization axes are 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 respectively placed in the left and right line of sight of the viewer. 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.