JPH04299383A - Three-dimensional display device - Google Patents

Abstract

PURPOSE:To provide the three-dimensional display device which is simplified and small in size and has good efficiency. CONSTITUTION:A laser light beam generation system 10 emits a linear laser light beam L which spreads in the direction of the X axis of the rotary screen 41 of a display system 40. A scanning system 20 puts the emitted laser light beam L in scanning direction in the Y-axial direction of the rotary screen 41 and then the light is projected on the rotary screen 41 having an XY plane. When the rotary screen 41 rotates and moves in the Z-axial direction, a three- dimensional image is obtained on the rotary screen 41.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional display device that uses laser beams and is capable of displaying three-dimensional images on a single rotating screen.

0002

BACKGROUND OF THE INVENTION Examples of methods for displaying three-dimensional images by modulating or scanning a laser beam and projecting the laser beam onto a rotating or moving screen are disclosed in, for example, Japanese Patent Laid-Open Nos. 1-193836 and 2-211794. There are various publications.

0003

[Problem to be Solved by the Invention] Such a three-dimensional display device uses one laser light source (the latter prior art uses three, but each laser light source emits red, green, and blue laser beams). A laser beam emitted from a laser beam generation system consisting of a laser beam generating system that aims to properly obtain a color image by emitting a color image with this combination, and is considered to be one laser light source that forms an image. Since the configuration is such that the images are projected onto a rotating screen having an XY plane, a scanning system having a scanning mirror body is provided to scan the laser beam in each of the X and Y axes. X axis, Y
At least two mirrors are required to scan the axes individually, and therefore, a plurality of mirror drive units, which require complex control, are also required for each scanning mirror.

Furthermore, the laser beam is reflected by a scanning mirror that performs X-axis (Y-axis) scanning, then reflected by a scanning mirror that performs Y-axis (X-axis) scanning, and then projected onto a rotating screen. In this configuration, the area of the second scanning mirror must be made wide in accordance with the scanning range of the laser beam that can be scanned by the former scanning mirror, which increases the size of the scanning mirror. There was a problem in that the entire display device became large-scale.

[0005]

[Means for Solving the Problems] The present invention focuses on the above-mentioned conventional problems, and aims to pass a laser beam emitted from a laser beam generation system to a single sheet having an XY plane through a scanning system that scans the laser beam. In a three-dimensional display device that displays a three-dimensional image on the rotating screen by projecting onto a display system having a rotating screen, the laser beam generation system is arranged along one of the X-axis and the Y-axis of the rotating screen. A spreading linear laser beam is emitted, and the scanning system is configured to scan the laser beam on the other axis of the Y axis or the X axis of the rotating screen.

[0006]

[Operation] A linear laser beam that spreads along the X-axis or Y-axis is reflected by a scanning system in which multiple laser light sources are arranged in parallel along the X-axis or Y-axis and the laser beam is scanned only on the Y-axis or X-axis. are projected onto the rotating screen as light rays in the XY plane, and the rotating screen rotates and moves along the Z axis, thereby displaying a three-dimensional image on the rotating screen.

[0007]

[Embodiments] Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. Fig. 1 is a schematic diagram of the main part of the first embodiment, and numeral 10 indicates a plurality of laser light sources, for example, a red laser. Diodes 11 are arranged in parallel along the X axis of a rotating screen, which will be described later, and the emission state (on/off, intensity, etc.) of the laser beam L is controlled by a laser beam driver (not shown) having a preset program. This is a laser beam generation system designed to

Reference numeral 20 denotes a scanning mirror body 21 of a galvano mirror type or polygon mirror type that reflects the laser beam L.
and a mirror drive unit 22 for scanning the reflected laser beam L along the Y axis of a rotating screen, which will be described later.

Reference numeral 30 denotes a well-known image rotator 31 consisting of a combination of a prism and a plurality of mirror bodies for transmitting the laser beam L reflected by the scanning system 20 to a rotating screen (described later), and this image rotator 31. This is a transmission system that includes an image rotator drive unit 32 that rotates the image rotator.

40 is a turntable 43 on which is mounted one or more reflecting mirrors 42 for receiving the laser beam L from the transmission system 30 and directing it to a rotating screen 41 for projection;
This display system includes a turntable drive section 44 that rotates the turntable 43, and a window 4 through which the laser beam L from the transmission system 30 enters the rotating screen 41 side.
5 is provided. The rotating screen 41 is a flat plate made of a semi-transparent material and has an XY plane, but it may be an opaque projection screen if it is to be viewed from one side.

The image rotator 31 and the turntable 43 on which the rotating screen 41 is mounted are centered on the same axis, and the image rotator 31 rotates the passing laser beam L at twice the rotational speed of the image rotator 31. Since the image rotator 31 has the function of rotating at a rotation speed of the turntable 43, the respective drive units 32 and 44 are controlled to rotate the image rotator 31 synchronously at half the rotational speed of the turntable 43. In response to this rotation, the scanning mirror body 21 of the scanning system 20
The mirror drive section 22 controls the scanning speeds of the mirrors so that they are synchronized.

In the three-dimensional display device having this configuration, X emitted from the laser diode 11 of the laser beam generation system 10
When the linear laser beam L that spreads along the axis is reflected by the scanning mirror 21 of the scanning system 20, it is scanned along the Y axis to become a beam on the XY plane, passes through the image rotator 31 of the transmission system 30, and is transmitted to the display system. 40 reflecting mirror bodies 42 and the rotating screen 41 rotates and moves along the Z axis, a three-dimensional image is obtained on the rotating screen 41.

FIG. 2 is a schematic diagram of the main parts of the second embodiment, which has the same configuration as the first embodiment shown in FIG.
A plurality of laser diodes 11 of the laser beam generation system 10 are arranged radially in parallel along the X-axis so that the laser beams L emitted from the respective laser diodes 11 are converged on the scanning mirror body 21 of the scanning system 20. ing.

According to this configuration, compared to the first embodiment, the scanning system 2 up to the rotating screen 41 of the display system 40 is
0 scanning mirror body 21, image rotator 3 of transmission system 30
1 and the reflecting mirror body 42 of the display system 40 can be made smaller.

FIG. 3 is a schematic diagram of the main part of the third embodiment, which differs from the first and second embodiments shown in FIGS. The laser beam L reflected by the scanning mirror 21 of the system 20 is directly projected onto the rotating screen 41 of the display system 40.

According to this configuration, the transmission system 30 (FIGS. 1 and 2
(see) is not required, the overall configuration of the three-dimensional display device can be further simplified and can be made compact.

In each of the above embodiments, the laser beam generating system 10 is shown that emits the laser beam L in a linear form extending along the In this case, if the scanning system 20 is configured to scan the laser beam L along the X-axis, it is possible to display a three-dimensional image as in each of the embodiments described above.

[0018]

Effects of the Invention The present invention projects a laser beam emitted from a laser beam generation system onto a display system having one rotating screen having an XY plane through a scanning system that scans the laser beam. In the three-dimensional display device that displays a three-dimensional image on the screen, the laser beam generation system emits a linear laser beam that spreads along one of the X-axis and the Y-axis of the rotating screen, and the scanning system is configured to scan the laser beam on the other axis of the Y-axis or the X-axis of the rotating screen, and since the laser beam is emitted in a linear shape that spreads along the It is only necessary to scan in the Y axis or the , can be stored in a small size.

Moreover, since the scanning system is simplified, the attenuation of the laser beam is reduced, and efficient display can be performed.

Furthermore, by using a laser diode as a laser light source, a lightweight and compact laser beam generation system can be realized.

Furthermore, by arranging the laser light sources in a radial manner so that the laser beam emitted from the laser light source of the laser light source generation system converges on the scanning system, the scanning of the scanning system up to the rotating screen of the display system is improved. Mirror bodies etc. can be made smaller

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of main parts of a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of main parts of a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of main parts of a third embodiment of the present invention.

[Explanation of symbols]

10 Laser beam generation system 11 Laser diode 20 Scanning system 21 Scanning mirror 22 Mirror drive unit 30 Transmission system 31 Image rotator 32 Image rotator drive unit 40 Display system 41 Rotating screen 42 Reflector 43 Turntable 44 Turntable drive unit 45 Window

Claims (5)

[Claims] Claim 1: A laser beam emitted from a laser beam generation system is transmitted through a scanning system that scans the laser beam in an XY direction.
In a three-dimensional display device that displays a three-dimensional image on the rotating screen by projecting onto a display system having one flat rotating screen, the laser beam generating system is arranged along the X-axis or Y-axis of the rotating screen. The three-dimensional device is characterized in that it emits a linear laser beam that spreads along one of the axes, and the scanning system scans the laser beam on the other axis of the Y-axis or the X-axis of the rotating screen. Display device. 2. The three-dimensional display device according to claim 1,
A three-dimensional display device, wherein the laser beam generation system includes a plurality of laser light sources arranged in parallel. 3. The three-dimensional display device according to claim 2,
A three-dimensional display device, wherein the laser light source is a laser diode. 4. The three-dimensional display device according to claim 2,
A three-dimensional display device, characterized in that the laser light sources are arranged radially in parallel so that laser beams emitted from the laser light sources are converged on the scanning system. 5. The three-dimensional display device according to claim 4,
A three-dimensional display device, wherein the laser light source is a laser diode.