# US 11,994,658 B2 · Projector

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- Number: US 11,994,658 B2
- Document ID: US11994658B2
- Status: Granted
- Kind: B2
- Application number: 17/153,898
- Filed: 2021-01-21
- Published: 2021-08-19
- Granted: 2024-05-28
- Earliest claimed: 2020-02-15
- Assignees: Qisda Corporation
- Applicants: Qisda Corporation
- Inventors: Ming-Kuen Lin; Chih-Shiung Chien; Tsung-Hsun Wu
- Web page: https://patentgrep.com/patent/US11994658B2

## CPC

- G02B 13/16: for use in conjunction with image converters or intensifiers {, or for use with projectors, e.g. objectives for projection TV}
- H04N 9/3105: {for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators (simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10)}
- G02B 13/22: Telecentric objectives or lens systems
- G02B 17/023: {for extending or folding an optical path, e.g. delay lines}
- G02B 27/1026: {for use with reflective spatial light modulators}
- G03B 21/008: {using micromirror devices}
- G03B 21/142: {Adjusting of projection optics}
- G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)}
- G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)}
- G03B 21/53: Means for automatic focusing, e.g. to compensate thermal effects
- G03B 21/54: Accessories
- H04N 5/7458: {the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- 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 projector includes a lens, a beam processing module, a plurality of digital micromirror devices, a reflecting module and an illumination module. The beam processing module is disposed with respect to the lens. The digital micromirror devices are disposed around the beam processing module, wherein a beam projecting path is defined between the lens and the digital micromirror device. The reflecting module is disposed with respect to the digital micromirror devices and located beyond the beam projecting path. The illumination module is disposed with respect to the reflecting module. An initial beam projected by the illumination module is reflected to the digital micromirror devices by the reflecting module, such that the digital micromirror devices generate a plurality of image beams. The beam processing module combines the image beams to form a projecting beam and projects the projecting beam onto the lens along the beam projecting path.

## Claims

### Claim 1

A projector comprising:
a lens;
a beam processing module disposed relative to the lens;
a plurality of digital micromirror devices disposed around the beam processing module, a beam projecting path being defined between the lens and at least one digital micromirror device;
a reflecting module disposed relative to the plurality of digital micromirror devices and located beyond the beam projecting path; and
an illumination module disposed relative to the reflecting module;
wherein an initial beam projected by the illumination module is reflected to the plurality of digital micromirror devices by the reflecting module, so that the plurality of digital micromirror devices generates a plurality of image beams, and the beam processing module combines the plurality of image beams to form a projecting beam and projects the projecting beam onto the lens along the beam projecting path;
wherein a beam emitting path is defined between the reflecting module and the digital micromirror device, an angle between the beam projecting path and the beam emitting path is greater than or equal to twenty degrees.

### Claim 2 (depends on 1)

The projector of claim 1, wherein the angle between the beam projecting path and the beam emitting path is smaller than or equal to forty degrees.

### Claim 3 (depends on 1)

The projector of claim 1, wherein the reflecting module comprises at least one prism or at least one mirror.

### Claim 4 (depends on 1)

The projector of claim 1, wherein the initial beam projected by the illumination module is reflected to the beam processing module by the reflecting module, the beam processing module divides the initial beam into a plurality of medium beams and reflects the plurality of medium beams to the plurality of digital micromirror devices, the plurality of digital micromirror devices reflects the plurality of medium beams to generate the plurality of image beams.

### Claim 5 (depends on 1)

The projector of claim 1, further comprising:
a beam splitting module disposed between the reflecting module and the illumination module;
wherein the initial beam projected by the illumination module is divided into a plurality of medium beams by the beam splitting module, the plurality of medium beams is reflected to the plurality of digital micromirror devices by the reflecting module, the plurality of digital micromirror devices reflects the plurality of medium beams to generate the plurality of image beams.

### Claim 6 (depends on 1)

The projector of claim 1, wherein two digital micromirror devices of the plurality of digital micromirror devices are disposed on two opposite sides of the beam processing module.

### Claim 7 (depends on 1)

The projector of claim 1, wherein a thickness of the beam processing module is ranged between 20 millimeter and 30 millimeter.