# US 2019/0320149 A1 · Light source device, illumination apparatus, and projector apparatus

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- Number: US 2019/0320149 A1
- Document ID: US20190320149A1
- Status: Published application
- Kind: A1
- Application number: 16/379,510
- Filed: 2019-04-09
- Published: 2019-10-17
- Earliest claimed: 2018-04-12
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: KOJI TAKAHASHI; HIDENORI KAWANISHI
- Web page: https://patentgrep.com/patent/US20190320149A1

## CPC

- H04N 9/3161: {using laser light sources (using laser beams scanning the display screen H04N9/3129)}
- G02B 19/0052: {the light source comprising a laser diode (coupling into light guides using intermediate optical elements G02B6/4204; semiconductor lasers having optical devices external to the laser cavity H01S5/005)}
- G02B 27/0905: {Dividing and/or superposing multiple light beams}
- G02B 27/0994: {Fibers, light pipes (optical fibers per se G02B6/02)}
- G02B 27/1006: {for splitting or combining different wavelengths (G02B27/1086, G02B27/141 take precedence)}
- G03B 21/2033: {LED or laser light sources}
- G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)}
- G03B 21/208: {Homogenising, shaping of the illumination light}
- H04N 9/3164: {using multiple light sources}
- G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- 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)

## Abstract

A light source device includes an optical member. The optical member has an inner space. At least one entrance opening and one exit opening are formed in the optical member. The at least one entrance opening allows a laser beam emitted from a laser-beam source to enter the inner space. The one exit opening allows a laser beam that is scattered or reflected in the inner space to be emitted to the outside of the optical member.

## Claims

### Claim 1

A light source device comprising:
an optical member,
wherein the optical member has an inner space, and
wherein at least one entrance opening and one exit opening are formed in the optical member, the at least one entrance opening allows a laser beam emitted from a laser-beam source to enter the inner space, and the one exit opening allows a laser beam that is scattered or reflected in the inner space to be emitted to the outside of the optical member.

### Claim 2 (depends on 1)

The light source device according to claim 1,
wherein the inner space is surrounded by an inner wall, and
wherein the inner wall is coated with a light diffusing substance or a light reflecting material.

### Claim 3 (depends on 2)

The light source device according to claim 2,
wherein the inner space is filled with a light-transmissive material including a light scattering substance.

### Claim 4 (depends on 2)

The light source device according to claim 2,
wherein a shape of the inner wall is hemispherical.

### Claim 5 (depends on 4)

The light source device according to claim 4,
wherein the at least one entrance opening includes two or more entrance openings, and
wherein the entrance openings and the exit opening are formed in such a way that, when one of the entrance openings is connected by a straight line with a center of a circle of a bottom surface of the hemispherical inner wall, any of the other entrance openings and the exit opening does not overlap an extension line of the straight line.

### Claim 6 (depends on 2)

The light source device according to claim 2,
wherein a shape of the inner wall is spherical.

### Claim 7 (depends on 6)

The light source device according to claim 6,
wherein the at least one entrance opening includes two or more entrance openings, and
wherein the entrance openings and the exit opening are formed in such a way that, when one of the entrance openings is connected by a straight line with a center of the spherical inner wall, any of the other entrance openings and the exit opening does not overlap an extension line of the straight line.

### Claim 8 (depends on 2)

The light source device according to claim 2,
wherein a shape of the inner wall is a cylindrical tube or a prismatic tube, and
wherein the entrance opening is formed at one end of the cylindrical tube or the prismatic tube, and the exit opening is formed at the other end of the cylindrical tube or the prismatic tube.

### Claim 9 (depends on 1)

The light source device according to claim 1,
wherein the at least one entrance opening includes three entrance openings, and
wherein the three entrance openings respectively allow light beams emitted from R, G, and B laser-beam sources to enter the inner space.

### Claim 10 (depends on 9)

The light source device according to claim 9, further comprising:
three semiconductor laser devices that respectively emit R, G, and B light beams as the laser beam sources.

### Claim 11 (depends on 1)

The light source device according to claim 1, further comprising:
a light projecting portion disposed outside the exit opening.

### Claim 12 (depends on 1)

The light source device according to claim 1, further comprising:
a focusing portion disposed between the entrance opening and the laser-beam source.

### Claim 13 (depends on 1)

An illumination apparatus comprising:
the light source device according to claim 1.

### Claim 14 (depends on 1)

A projector apparatus comprising:
the light source device according to claim 1.