Laser source and laser projection apparatus

Patent metadata

Field	Value
Publication number	US-12306519-B2
Application number	US-202117481800-A
Country	US
Kind code	B2
Filing date	Sep 22, 2021
Priority date	Oct 25, 2019
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A laser source includes a laser source housing, a laser array and a beam path assembly. The laser source housing includes an accommodating opening and a beam outlet. The laser array is disposed in the accommodating opening. The laser array is configured to emit laser beams into the laser source housing. A laser-exit surface of the laser array includes a plurality of laser-exit regions. The plurality of laser-exit regions are configured to emit laser beams of multiple colors. The beam path assembly is disposed inside the laser source housing. The beam path assembly is configured to combine the laser beams of the multiple colors emitted by the laser array, and make the combined laser beams exit toward the beam outlet.

First claim

What is claimed is:

1. A laser source, comprising:
a laser source housing, the laser source housing including a plurality of accommodating openings and a beam outlet, the plurality of accommodating openings being disposed at a same side wall or different side walls of the laser source housing;
a plurality of laser arrays, the plurality of laser arrays being respectively disposed in the plurality of accommodating openings, and each laser array of the plurality of laser arrays being configured to emit laser beams into the laser source housing, and a laser-exit surface of the laser array including a plurality of laser-exit regions, and the plurality of laser-exit regions being configured to emit laser beams of multiple colors; and
a beam path assembly, the beam path assembly being disposed inside the laser source housing, and the beam path assembly being configured to combine the laser beams of the multiple colors emitted by the laser array, and make combined laser beams exit toward the beam outlet.

2. The laser source according to claim 1 , wherein the laser source housing includes a first side wall and a second side wall that are perpendicular to each other, the first side wall includes the plurality of accommodating openings, and the second side wall includes the beam outlet.

3. The laser source according to claim 2 , wherein
the plurality of accommodating openings are arranged in a direction perpendicular to the second side wall; or
the plurality of accommodating openings are arranged in a direction substantially parallel to the second side wall.

4. The laser source according to claim 2 , wherein the first side wall includes two accommodating openings, and two laser arrays are respectively disposed in the two accommodating openings.

5. The laser source according to claim 1 , wherein
the laser source housing includes a first side wall and a third side wall that are opposite to each other, and a second side wall perpendicular to the first side wall and the third side wall;
the first side wall and the third side wall each includes at least one accommodating opening, and the second side wall includes the beam outlet; and
a part of the plurality of laser arrays are disposed in the at least one accommodating opening of the first side wall, and another part of the plurality of laser arrays are disposed in the at least one accommodating opening of the third side wall.

6. The laser source according to claim 1 , wherein the plurality of laser-exit regions includes:
a first laser-exit region being configured to emit a first color laser beam;
a second laser-exit region being configured to emit a second color laser beam; and
a third laser-exit region being configured to emit a third color laser beam; wherein
the first color laser beam, the second color laser beam, and the third color laser beam are combined to form a white laser beam.

7. The laser source according to claim 6 , wherein
the first laser-exit region, the second laser-exit region, and the third laser-exit region are sequentially arranged from an end of the laser source housing far away from the beam outlet to an end of the laser source housing proximate to the beam outlet;
the beam path assembly includes:
a plurality of combining lens groups, the plurality of combining lens groups and the plurality of laser arrays being in one-to-one correspondence, each combining lens group being located at a same side or different sides of the plurality of laser arrays, and the combining lens group being configured to combine the laser beams of the multiple colors emitted by a corresponding laser array.

8. The laser source according to claim 7 , wherein
the beam path assembly further includes a plurality of reflectors, the plurality of reflectors and the plurality of combining lens groups are in one-to-one correspondence, each of the plurality of reflectors is configured to change a propagation path of laser beams emitted by a corresponding combining lens group, so as to make the laser beams exited from the corresponding combining lens group exit toward the beam outlet, wherein
the plurality of combining lens groups include two combining lens groups, and the plurality of reflectors include two reflectors;
laser-exit directions of the two combining lens groups are same, arrangement directions of first laser-exit regions, second laser-exit regions, and third laser-exit regions of two laser arrays are same; or, laser-exit directions of the two combining lens groups are opposite, and arrangement directions of first laser-exit regions, second laser-exit regions, and third laser-exit regions of two laser arrays are opposite; and
a first laser-exit region, a second laser-exit region, and a third laser-exit region of each of the two laser arrays are sequentially arranged in a direction from an end of the laser source housing away from a corresponding reflector to an end of the laser source housing proximate to the corresponding reflector.

9. The laser source according to claim 7 , further comprising at least one of the following:
a spherical lens located in the beam outlet, the spherical lens being configured to converge laser beams entering the beam outlet; or
a light homogenizing member located at a beam inlet side of the beam outlet.

10. The laser source according to claim 6 , wherein
the beam path assembly includes a combining lens group corresponding to the laser array, and the combining lens group is configured to combine the laser beams of the multiple colors emitted by the laser array; and
the combining lens group includes:
a first combining lens located at a laser-exit side of the first laser-exit region, to reflect the first color laser beam emitted by the first laser-exit region;
a second combining lens located at a laser-exit side of the second laser-exit region, to reflect the second color laser beam emitted by the second laser-exit region; and
a third combining lens located at laser-exit sides of the third laser-exit region, the first combining lens and the second combining lens, to reflect the third color laser beam emitted by the third laser-exit region, to transmit the first color laser beam reflected by the first combining lens, and to transmit the second color laser beam reflected by the second combining lens.

11. The laser source according to claim 10 , wherein
an optical axis of the first color laser beam reflected by the first combining lens, an optical axis of the second color laser beam reflected by the second combining lens and an optical axis of the third color laser beam reflected by the third combining lens are substantially collinear; and/or
the first color laser beam emitted by the first laser-exit region is one of a blue laser beam and a green laser beam, the second color laser beam emitted by the second laser-exit region is another one of the blue laser beam and the green laser beam, and the third color laser beam emitted by the third laser-exit region is a red laser beam.

12. The laser source according to claim 10 , wherein
an included angle between a reflection portion of the first combining lens and the laser-exit surface of the laser array corresponding to the combining lens group, an included angle between a reflection portion of the second combining lens and the laser-exit surface of the laser array corresponding to the combining lens group, and an included angle between a reflection portion of the third combining lens and the laser-exit surface of the laser array corresponding to the combining lens group are all within a range of 43° to 47° (45°±2°); and/or
a reflection portion of the first combining lens, a reflection portion of the second combining lens, and a reflection

Assignees

• Hisense Laser Display Co Ltd

Inventors

• Tian Xintuan
• Zhou Boyu

Classifications

• G03B33/12

  using beam-splitting or beam-combining systems, e.g. dichroic mirrors · CPC title

• G03B21/2066

  Reflectors in illumination beam (in projection beam G03B21/28) · CPC title

• G03B21/208

  Homogenising, shaping of the illumination light · CPC title

• G03B21/2073

  Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197) · CPC title

• G03B21/16

  Cooling; Preventing overheating · CPC title