JPH0474088A - Pickup distance reproduction type stereoscopic television receiver - Google Patents

Abstract

PURPOSE:To eliminate need for an eyeglass, to attain simultaneous observation by lots of persons and to use a conventional television receiver as it is by arranging a lens group movable in the forward and reverse directions, larger than a CRT screen and not giving a change to a lateral magnification of the CRT screen to a front face of the CRT output screen. CONSTITUTION:A concave lens 21 and a convex lens 22 larger than a screen of a CRT 1 are arranged in front of the screen of a CRT 1 in a pickup distance reproduction type stereoscopic television receiver A. A lens group 2 is moved in the forward and reverse directions by a servo motor 3 activated based on a signal representing the pickup distance when an automatic focus television camera 4 is used. Thus, persons observing the CRT screen via the lens group 2 visually recognize as if the CRT output screen were apparently in existence at a position in response to the position of the depth of the television camera.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a three-dimensional television that reproduces the shooting distance, and in particular, to a general home television (CRTI) in which a lens group according to the present invention is disposed in front of the television. This is a shooting distance reproduction type 3D television that enables 3D reproduction of ordinary images, not special 3D images, without the use of special tools such as glasses.

[Prior art] Examples of conventional applications of this type of technology to stereoscopic television include the anaglyph type using special polarization and shutter glasses, the balarax stereogram, the lenticular type, the large concave mirror type, and the large convex lens type. There is a multi-lens type, such as a lenticular type, a varifocal mirror type, and a rotating cylindrical type. Many methods have been proposed, including depth sampling methods such as the display area layered method, half-mirror combination method, and display surface vibration method, and holography using laser reproduction holograms, white light reproduction holograms, etc. Attempts have been made to put it into practical use for general households and business use, but only some of them have been put into practical use for business use.Furthermore, in broadcast media, anaglyph format using red-blue glasses, and concentration using Pulfrich effect. Although the differential type was broadcast, full-scale practical use has been difficult due to the compatibility between conventional mono images and 3D images, and it is still a long way from being suitable for general home use. Here, each of the three-dimensional television systems in the prior art described above has the characteristics shown in the table below, and has advantages and disadvantages.

[Problems to be Solved by the Invention] Therefore, the present invention eliminates the need for glasses, which are an important element of 3D televisions, enables simultaneous observation by many people, and allows conventional televisions to be used as they are. It is also an object of the present invention to develop a stereoscopic television that can be used with conventional video software by adding an electrical signal, and that can satisfy various requirements such as making it possible to mass produce the device.

[Means for Solving the Problems] Firstly, the present invention has the following features: Firstly, in front of the CRT output surface, there is a device that is movable back and forth and is at least larger than the CRT surface, and
Even if the lens group is moved back and forth, when the CRT surface is viewed through the lens group, the lateral magnification of the CRT surface does not change or is very small. A signal indicating the photographing distance at the time of photographing is added and sent to the lens group, and the lens group is moved back and forth in conjunction with the photographing distance of the television camera at the time of the image, and the convergence of the lens group is increased. By changing
C at a position corresponding to the depth position of the TV camera's shooting distance.
A stereoscopic television with a shooting distance reproduction method that visually recognizes the apparent existence of an RT output surface.Secondly, a variable focus type and at least larger than the CRT surface is provided in front of the CRT output surface.
In addition, even if the focal length of some or all of the lenses is changed, the CRT surface remains unchanged when the CRT surface is viewed through the lens group.
By arranging a lens group in which the lateral magnification of the RT plane does not change or has very little change, and by adding a signal indicating the shooting distance when shooting with a TV camera to the normal video signal and sending it to the lens group, the image can be By changing the focal length of part or all of each lens in conjunction with the shooting distance of the TV camera at the time of CR in position
A third aspect of the present invention is a three-dimensional photographing distance reproducing stereo television that visually recognizes the apparent existence of a CRT output surface.
The CRT surface is larger than the T plane, and even if the lens group is moved back and forth or the focal length of some or all of the lenses is changed, when the CRT surface is viewed through the lens group, the CRT surface is
By arranging a lens group in which the lateral magnification of the RT plane does not change or has very little change, and by adding a signal indicating the shooting distance when shooting with a TV camera to the normal video signal and sending it to the lens group, the image can be By moving the lens group back and forth in conjunction with the shooting distance of the television camera at the time of The purpose of the present invention is to achieve the above-mentioned object by using a shooting distance reproduction type 3D television that visually recognizes that the CRT output surface appears to exist at a position corresponding to the depth position of the shooting distance of the camera. and a variable-focus lens group disposed in front of the CRT output surface, which is at least larger than the CRT surface; and a lens group movable back and forth and variable in focus, which is disposed in front of the CRT output surface, and which is at least larger than the CRT surface. A part of the material of the lens group is electrically changed in refractive power so that the focal length of some or all of the lenses in the lens group can be quickly linked to a rapid change in the shooting distance of the television camera. By using an electro-optical device, more favorable effects can be obtained.

[Action 1 Regarding the action of the present invention constituted by the above means, CR
When changing the focal length by moving the lens group disposed in front of the T output surface, a pair of concave and convex lenses with the same focal length is connected to the CRT as shown in Figure 2.
When brought into close contact with the surface, the light emitted from point A is refracted by lenses a and b and reaches the human eye as shown by the solid line in FIG. Therefore, due to the convergence of the human eye, it seems that point A exists at the position Ao where the dotted lines intersect. Next, the pair of lens groups is separated from the CRT surface, and the third lens group is moved away from the CRT surface.
When placed as shown in the figure, light emitted from point A is refracted by lenses a and b and reaches the human eye as shown by the solid line in FIG. Therefore, point A becomes infinitely far away when the dotted lines intersect due to the convergence of the human eye, and it feels as if the CRT surface is at infinite distance.

Here, since the focal lengths of this pair of lenses are equal, there is no change in the apparent magnification of the image on the surface of the CR7 due to movement of the lens group.

Based on the above principle, the lens group moves in accordance with the signal indicating the shooting distance when shooting with a TV camera, which is sent from the input side in addition to the normal video signal, and the lens group moves. By changing the convergence angle, the observer can observe the CRT surface at a position that apparently corresponds to the photographing position. That is, by moving this pair of lenses, C
The surface of RT can be made to appear to the human eye as if it were located at that position within an infinite range from the position A' with changes in depth.

Next, when each lens in the lens group is of a variable focus type, the principle is the same as described above, but instead of moving the lens group as described above, the lens group is moved according to a signal indicating the shooting distance. By changing the refractive power of some or all of the lenses and changing the focal length, the convergence angle of the lens group is changed, and the position according to the depth position of the shooting distance of the television camera is seen by the human eye. To visually recognize that a CRT output surface appears to exist.

Next, if the lens group is movable and the focal length is variable, the principle is the same as described above, and there are two methods: moving the lens group and changing the focal length of some or all of the lenses. By changing the radiance angle, the CRT output surface is visually recognized to be located at a position corresponding to the depth of the photographing distance of the television camera.

Note that when the lens group is of a variable focus type, or is movable and has a variable focus, the change in focal length can be controlled by an electro-optical device in which a part of the lens group electrically changes refractive power, such as a liquid crystal display. By using , PLZT, etc., it is possible to quickly follow changes in the signal indicating the photographing distance.

[Example] In order to further clarify the gist of the paddle-shaped distance reproduction stereoscopic television of the present invention, an example will be described below with reference to the drawings.

A first embodiment will be described using FIG. As shown in FIG. 1, the shooting distance reproduction type 3D television A has a concave lens 21 in front of the screen of the CRT 1, which is larger than the screen size of the CRT 1, as well as a concave lens 21 which is larger than the screen size of the CRT 1. The convex lens 22 having a certain size is connected to the concave lens 2.
The concave lens 21 and the convex lens 22 are fixed at a constant interval to form a lens group 2, and the focal length of the concave lens 21 and the convex lens 22 are are configured to have equal focal lengths.

The lens group 2 is configured to be moved back and forth in front of the CRT screen by a servo motor 3 which is operated in response to a signal indicating the photographing distance when photographing with an autofocus television camera 4. This signal indicating the shooting distance is already included in the video information, and in the past it was erased.
The signal can be easily extracted. Especially in today's world where autofocus technology exists, it is extremely easy to obtain this signal.

When using this 3D TV A that reproduces shadow distance, the video information shot by the autofocus TV camera 4 is transferred to the lens by the servo motor 3 that operates based on a signal indicating the shooting distance when shooting with the TV camera 4. Since group 2 moves back and forth, for example, when the shooting distance is short, the lens group is
Because it is located close to the RT screen, the image information on the CRT screen appears to be close to the observer;
When the shooting distance is long, the lens group is located far away from the CRT screen, so the image information on the CRT screen appears to be far away from the observer. A person observing the CRT screen can visually recognize that the CRT output surface appears to exist at a position corresponding to the depth position of the television camera 5.Here, the focal lengths of the concave lens 21 and the convex lens 22 are the same. Therefore, there is no change in the apparent magnification of the image on the surface of the CRT due to the movement of the lens group, and there is no problem in visual recognition.

Next, in the second embodiment, although not shown, a lens group consisting of a plurality of lenses is arranged in front of the CRT surface, and a part of the material of the lens group is used as an electro-optical device whose refractive index changes electrically. By using liquid crystal, a sense of depth is created by changing the refractive power of some or all of the lenses in the lens group, changing the focal length, and changing the wheel axis angle. The CRT is connected to an autofocus television camera, and a change in the refractive power of some or all of the lenses causes a voltage change in response to a signal indicating the shooting distance of the television camera, and the change in the voltage corresponds to the change in the voltage. It's starting to change. In this case, unlike the case of the first embodiment, there is no movement of the lens group, so failures can be reduced compared to the case of the first embodiment, and furthermore, no movement space is required. , less space is required. Furthermore, by using an electro-optical device whose refractive power changes electrically, such as a liquid crystal, as part of the material of the lens group, quick tracking according to a signal indicating the photographing distance becomes possible.

Furthermore, when the lens group is of a variable focus type, there is an advantage that there is less failure because there is no need to move the lens group, and less space is required because there is no need for moving distance. In addition, when the lens is movable and has a variable focus, the lens group can be moved over a short distance by being variable in focus, so that the same effect as described above is achieved in that less space is required.

Note that when the lens group is of a variable focus type, or is movable and has a variable focus, the change in focal length can be controlled by an electro-optical device in which a part of the lens group electrically changes refractive power, such as a liquid crystal display. By using , PLZT, etc., it is possible to quickly follow changes in the signal indicating the photographing distance.

Note that the present invention is not limited to this embodiment. For example, while the first embodiment of the present invention is explained using a normal concave-convex lens, a Fournel lens may also be used.
It goes without saying that the present invention can be modified as desired within the scope of achieving the purpose, operation, and effects described below, and these modifications do not change the gist of the present invention in any way.

[Effects of the Invention] As described above, the present invention provides at least the CRT which is movable or of a variable focus type, or of a movable and variable focus type, on the front surface of the CRT output surface.
By arranging a lens group larger than the T plane and adding a signal indicating the shooting distance when shooting with a TV camera to the normal video signal and sending it to the lens group, the shooting distance of the TV camera at the time of the image can be determined. By changing the axle angle of the lens group in conjunction with , the CRT output surface is visually recognized as appearing to exist at a position corresponding to the depth position of the photographing distance of the television camera. Since it is a distance reproduction type 3D TV, even if the image information is not taken in stereo and is taken in a normal manner, it is possible to reproduce the depth of the original object without using special equipment such as glasses. can. Conventionally, this signal indicating the shooting distance was already included as video information at the shooting stage, but since it is used, it is extremely easy to obtain the signal. . In particular, this is extremely easy with the autofocus technology that has become popular these days.

In particular, even if the lens group is moved or the focal length of some or all of the lenses in the lens group is changed, when the CRT surface is viewed through the lens group, the lateral magnification of the CRT surface will not change or will change significantly. Since the number of lens groups is small, there is no change in the CRT surface for the viewer, so C
Since it is only necessary to place a lens group larger than the output surface in front of the output surface of the RT, conventional TVs can be used as is, and conventional video software can also be used at shooting distances that are shorter than those taken with a TV camera. The structure of the device is relatively simple, and as mentioned above, conventional televisions can be used as is, making it extremely easy to mass-produce the entire device. If a person is positioned in front of the lens group, simultaneous observation by a large number of people is possible, which is also an advantageous factor for practical application.

For example, in depth sampling processing using a varifocal mirror, which is a conventional technology for stereoscopic viewing, it is necessary to change the magnification of an object on a CRT, but this is not necessary based on the present invention.

Furthermore, it does not have the disadvantages of conventional holography, such as the ability to reproduce landscape images and colorize the screen, and while conventional techniques had many advantages and disadvantages, the present invention has created a three-dimensional image with almost no defects. It allowed us to get a television, and it must be said that it was a truly excellent invention.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway side view showing the state of use, and FIGS. 2 and 3 are principle views showing the operation of the present invention. 1-----------C 2-----------Re 21---------H 3-----------Sate a, b-----Len Zurenlen Homo dynamic focus type October 1991

Claims (1)

[Claims] 1. In front of the CRT output surface, is movable back and forth and is at least larger than the CRT surface, and when the CRT surface is viewed through the lens group even when the lens group is moved back and forth. A lens group is provided in which the lateral magnification of the CRT surface does not change or has very little change, and a signal indicating the shooting distance when shooting with a television camera is added to the normal video signal and sent to the lens group, and the image is transmitted to the lens group. By moving the lens group back and forth in conjunction with the shooting distance of the TV camera and changing the convergence angle by the lens group, the CRT output surface is positioned at a position corresponding to the depth of the shooting distance of the TV camera. A three-dimensional television that reproduces the shooting distance is characterized in that it visually recognizes the apparent existence of a stereoscopic television. 2. In front of the CRT output surface, the CRT is of a variable focus type and is at least larger than the CRT surface, and even if the focal length of some or all of the lenses is changed, the CR
A lens group is provided that has no or very little change in the lateral magnification of the CRT surface when the T surface is visually recognized, and a signal indicating the photographing distance when photographing with a television camera is added to the normal video signal. The focal length of some or all of each lens is changed in conjunction with the shooting distance of the TV camera at the time of the image, and the convergence angle by the lens group is changed, thereby allowing the TV camera to take pictures. A shooting distance reproduction type stereoscopic television characterized by visually recognizing that a CRT output surface appears to exist at a position corresponding to a depth position. 3. In front of the CRT output surface, there is a lens movable back and forth and of a variable focus type, which is at least larger than the CRT surface, and the focal length of a part or all of each lens can be changed even when the lens group is moved back and forth. Even if the C
A lens group is provided that has no or very little change in the lateral magnification of the CRT surface when the RT surface is visually recognized, and a signal indicating the photographing distance when photographing with a television camera is added to the normal video signal. By moving the lens group back and forth in conjunction with the shooting distance of the TV camera at the time of the image, and changing the focal length of some or all of each lens, the convergence caused by the lens group is A shooting distance reproduction type three-dimensional television characterized in that by changing the angle, a CRT output surface is visually recognized to appear to exist at a position corresponding to the depth position of the shooting distance of a television camera. 4. A variable-focus lens arranged in front of the CRT output surface so that the focal length of some or all of the lenses in the lens group, which are larger than the CRT surface, can be quickly linked to rapid changes in the shooting distance of the television camera. 3. The shooting distance reproduction type stereoscopic television according to claim 2, wherein a part of the material of the lens group is made of an electro-optical device whose refractive power changes electrically. 5. The focal length of a part or all of the lens group, which is movable back and forth and is variable in focus and is larger than the CRT surface and is arranged in front of the CRT output surface, is quickly linked to the rapid change in shooting distance of the television camera. 4. The shooting distance reproduction type stereoscopic television according to claim 3, wherein a part of the material of the lens group is made of an electro-optical device whose refractive power changes electrically.