JPS6138450B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a three-dimensional image display device that provides slightly shifted images to the left and right eyes, respectively, so that a three-dimensional image can be perceived.

FIG. 1 shows an example of a device that is capable of perceiving three-dimensional objects using binocular parallax in this manner. In the figure, 1L and 1R each indicate a projector, and 2 indicates a large diameter convex lens. The projectors 1L and 1R provide the convex lens 2 with two left and right optical images having parallax information. An observer 3 located at a predetermined position on the opposite side of the convex lens 2 views the light image of the projector 1R with the right eye 4R and the light image of the projector 1L with the left eye 4L, thereby viewing the image with a three-dimensional effect. You can see it.

Such a three-dimensional image display device can perceive a three-dimensional image without using any special glasses, and the convex lens 2
The imaging effect of a large concave mirror (or a large concave mirror) has the advantage that it does not involve inversion of the sense of depth (pseudo→ortho conversion). However, due to the positional relationship between the projectors 1L, 1R and the convex lens 2, the observer 3 who can see stereoscopically
is fixed, and if the observer's position shifts to either the left or right, the brightness decreases as the amount of light decreases, and eventually the image disappears. In other words, it is necessary that the left and right images be presented to the eyes of the observer 3 at correct relative positions.

The present invention takes this point into consideration, and is designed to always correctly present left and right images even when the position of the observer 3 shifts to the left or right.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows that the light generated from the light source 5 is transmitted to the left and right image source slides 6L, 6R and the projection lens 7.
The incident light enters the large diameter convex lens 2 through the lenses L and 7R, and the convex lens 2 forms an image of the incident light near the left and right eyes 4L and 4R of the observer 3, so that bright left and right images are seen. Indicates the state in which The slides 6L, 6R are supported by a movable support 8, and the support 8 can be moved left and right by a servo motor 9 and a transmission mechanism (eg, a worm gear) 10. Reference numeral 11 indicates a spring interposed between the support body 8 and the fixed part. The positions of the light source 5 and projection lenses 7L and 7R are as follows:
Although they are fixed, they may be configured to be movable when the position changes significantly.

A detection device 12 is attached near one of the eyes of the observer 3, for example, the left eye 4L. The detection device 12 is
As shown in FIG. 3, for example, seven light receiving elements (phototransistors, photodiodes, etc.) 13a,
13b . . . 13g arranged horizontally, and has an attachment band 14 by which the detection device 12 is attached near the left eye 4L of the observer 3. This detection device 12
The detection outputs of each of the light receiving elements 13a to 13g are supplied to the processor 15, and the output of the processor 15 is supplied to the servo motor 9.

As shown in FIG. 4, the processor 15 includes amplifiers 16a to 16g that amplify the outputs of the light receiving elements 13a to 13g, respectively, a position determination circuit 17 to which the outputs of the amplifiers 16a to 16g are supplied, and this position determination circuit. Drive circuit 1 to which 17 discrimination signals are given
8, and the servo motor 9 is driven by the drive circuit 18. As the servo motor 9, a step motor can be used, and a linear motor may also be used.

As shown in FIG. 2, when the central axis of the light passing through the slide 6L and the projection lens 7L is aligned with the left eye 4L of the observer 3, the plurality of light receiving elements 13a to 13g of the detection device 12 Light from the light source 5 enters the central light receiving element 13d. In this state, the position determination circuit 17 provides the drive circuit 18 with a determination signal that it should be in a stationary state, and therefore the servo motor 9 does not rotate. Assume here that the observer 3 moves to the right as indicated by an arrow 19. Therefore, the incident light passing through the convex lens 2 enters the light receiving element, for example 13f, provided on the left side of the center of the detecting element 12.
This is determined by the position discriminating circuit 17, and the position discriminating circuit 17 provides information on the direction and amount of movement for the drive circuit 18 to move the support 8 to the slides 6R, 6L by a predetermined amount in the direction indicated by the arrow 20. Two discrimination signals are supplied, each having . Due to such feedback control, even if the observer 3 moves, the brightness does not decrease or the image disappears, and good stereoscopic vision can always be provided. Therefore, the three-dimensional image display device can be made more practical.

It should be noted that the image source must have at least two pieces of parallax information, but three or more may be used, and not only a slide but also a cathode ray tube or the like may be used. Alternatively, the two projection sources may be projected onto a screen with different incident axes on a screen having excellent recursion properties. Furthermore, it is practical to use a Fresnel lens as the convex lens 2. Furthermore, in order to detect the observation position, a laser beam may be used separately, or the observer may be photographed with a television camera or the like, and a pattern recognition device may be provided that matches the eye with the linear projection image.

Further, in one embodiment of the present invention described above, the slide 6
Both L and 6R are moved in the horizontal direction to cope with movement of the observation position in the left-right direction, but it is also possible to deal with movement of the observation position in the front-back direction. For this purpose, the position of the convex lens 2 is made variable in the front-rear direction, or a variable focus lens is used as the convex lens 2, and furthermore, the distance between the slides 6L and 6R is made variable.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram used to explain a three-dimensional image display device to which the present invention can be applied, FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is a perspective view of a detection device, and FIG.
The figure is a block diagram showing the configuration of the processor. 2 is a convex lens, 3 is an observer, 5 is a light source, 6L,
6R is a slide, 9 is a servo motor, 12 is a detection device, and 13a to 13g are light receiving elements.

Claims (1)

[Claims] 1. In a three-dimensional image display device in which a plurality of optical images having parallax information are observed by the left and right eyes through a concave mirror, a convex lens is used to connect the observer's eye and the incident light to the eye through the convex lens or concave mirror. A tertiary device comprising means for photoelectrically detecting the horizontal positional relationship with the light, and position control means for making the central axis of the incident light approximately coincide with the observer's eye based on the detection output. Original image display device.