# US 10,481,409 B2 · Projection device and projection-type video display device

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- Number: US 10,481,409 B2
- Document ID: US10481409B2
- Status: Granted
- Kind: B2
- Application number: 15/833,393
- Filed: 2017-12-06
- Published: 2018-04-05
- Granted: 2019-11-19
- Earliest claimed: 2010-09-08
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Makio Kurashige; Kazutoshi Ishida; Tomoe Takanokura; Yasuyuki Ooyagi
- Web page: https://patentgrep.com/patent/US10481409B2

## CPC

- G02B 27/48: Laser speckle optics
- G02B 5/32: Holograms used as optical elements
- G02B 26/10: Scanning systems
- G02B 26/101: {with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129)}
- G03B 21/2013: {Plural light sources}
- G03B 21/2033: {LED or laser light sources}
- G03B 21/2046: {Positional adjustment of light sources}
- G03B 21/208: {Homogenising, shaping of the illumination light}
- G03H 1/22: Processes or apparatus for obtaining an optical image from holograms (G03H1/26 - G03H1/34 take precedence)
- G03H 1/2286: {Particular reconstruction light (G03H1/24 takes precedence); Beam properties}
- G03H 1/32: Systems for obtaining speckle elimination
- H04N 9/3129: {scanning a light beam on the display screen (scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161)}
- H04N 9/3147: {Multi-projection systems (video walls G06F3/1446)}
- G03H 1/0005: {Adaptation of holography to specific applications (holographic optical element G02B5/32; holographic scanner G02B26/106; recognition using holographic mask G06V10/88; holographic memories G11B7/0065, G11C13/042)}
- G03H 2222/36: Scanning light beam
- G03H 2225/60: Multiple SLMs
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- G03H: HOLOGRAPHIC PROCESSES OR APPARATUS (holograms, e.g. point holograms, used as ordinary optical elements G02B5/32; producing stereoscopic or other three-dimensional effects G02B30/00; diffraction-grating systems G02B27/44; systems using moiré fringes G02B27/60; optical logic elements G02F3/00; stereo-photography G03B35/00; photosensitive materials or processes for photographic purposes G03C; {stereo-photographic or similar processes G03C9/00}; apparatus for processing exposed photographic materials G03D; analogue computers performing mathematical operations with the aid of optical elements G06E3/00; authentication by radiation, of concealed information carried by holograms or diffraction gratings G06K19/16; holographic storage G11B7/0065, G11C13/04; {stereoscopic or other three dimensional effects in television systems H04N13/00})
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An illumination device includes an optical element including a hologram recording medium capable of diffusing a coherent light beam, the hologram recording medium comprising a plurality of regions, each region diffusing a coherent light beam to an illuminated region corresponding to that region, and an irradiation device configured to irradiate the optical element with the coherent light beam so as to allow the coherent light beam to scan the hologram recording medium. The coherent light beam incident to a position existing in each region of the hologram recording medium is diffused to an entire region of the illuminated region corresponding to the region in order to illuminate the entire region of the illuminated region.

## Claims

### Claim 1

An optical element comprising a hologram recording medium capable of diffusing a coherent light beam, the hologram recording medium comprising a plurality of hologram recording medium regions, each hologram recording medium region diffusing a coherent light beam irradiated from an irradiation device to an illuminated region corresponding to the hologram recording medium region,
wherein each hologram recording medium region comprises a plurality of positions in such hologram recording medium region, for each hologram recording medium region, each coherent light beam incident to a position in such hologram recording medium is diffused to an entirety of the respective illuminated region corresponding to the hologram recording medium region in order to illuminate the entirety of the illuminated region.

### Claim 2 (depends on 1)

The optical element according to claim 1,
wherein an illuminated region corresponding to a hologram recording medium region is shifted from an illuminated region corresponding to another hologram recording medium region.

### Claim 3 (depends on 1)

An illumination device comprising,
The optical element according to claim 1; and
the irradiation device configured to irradiate the optical element with the coherent light beam.

### Claim 4

An optical element comprising a plurality of light diffusion elements, each light diffusion element capable of changing a propagation direction of an incident light beam, each light diffusion element diffusing a coherent light beam irradiated from an irradiation device to an illuminated region corresponding to the light diffusion element,
wherein each light diffusion element comprises a plurality of positions in such light diffusion element, for each light diffusion element, each coherent light beam incident to a position in such light diffusion element is diffused to an entirety of the respective illuminated region corresponding to the light diffusion element in order to illuminate the entirety of the illuminated region.

### Claim 5 (depends on 4)

The optical element according to claim 4,
wherein an illuminated region corresponding to a light diffusion element is shifted from an illuminated region corresponding to another light diffusion element.

### Claim 6 (depends on 4)

The optical element according to claim 4, wherein the light diffusion element is a lens array.

### Claim 7 (depends on 4)

An illumination device comprising,
The optical element according to claim 4; and
the irradiation device configured to irradiate the optical element with the coherent light beam.