Laser light source and laser projection device

Patent metadata

Field	Value
Publication number	US-11570411-B2
Application number	US-201916702438-A
Country	US
Kind code	B2
Filing date	Dec 3, 2019
Priority date	Jan 10, 2019
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

Embodiments of the present application provide a laser light source and a laser projection device. The laser light source includes a laser assembly, where the laser assembly includes a laser and a circuit board, the laser includes a substrate and a light emitting chip arranged on the substrate, a lateral surface of the substrate is provided with a plurality of pins extending outwards therefrom, the circuit board is arranged on a side where the pins extend, and the circuit board is electrically connected to the pins. The laser light source of the present application features simple assembling and disassembling, reliable performance and relatively low cost.

First claim

What is claimed is:

1. A laser light source, comprising a laser and a laser heat dissipation assembly for dissipating heat from the laser, wherein:
the laser is provided with a heat sink on a side facing the laser heat dissipation assembly, the laser heat dissipation assembly comprises a heat conduction layer and a fin module, and the heat sink is in contact with the heat conduction layer;
the heat conduction layer comprises at least two heat conduction blocks, with a plurality of thermotubes arranged between adjacent heat conduction blocks, each of the thermotubes comprises a hot end, a cold end, and a bent part connecting the hot end and the cold end, and the hot ends are respectively connected with adjacent heat conduction blocks; and
the fin module comprises a plurality of cooling fins that are parallel to each other, and the cold ends run vertically through the cooling fins, respectively;
wherein the at least two heat conduction blocks comprise a first solid heat conduction block, a second solid heat conduction block and a third solid heat conduction block, and the heat sink is in contact with the first solid heat conduction block;
a first layer of thermotubes are arranged between the first solid heat conduction block and the second solid heat conduction block, and hot ends of the first layer of thermotubes are in contact with the first solid heat conduction block and the second solid heat conduction block, respectively; and
a second layer of thermotube is arranged between the second solid heat conduction block and the third solid heat conduction block, and a hot end of the second layer of thermotube is in contact with the second solid heat conduction block and the third solid heat conduction block, respectively,
wherein the second solid heat conduction block is integral, a plurality of second grooves are provided on a side of the second solid heat conduction block facing the first solid heat conduction block, and the plurality of second grooves are configured to at least partially receive the hot ends of the first layer of thermotubes;
at least one third groove is provided on a side of the second solid heat conduction block facing the third solid heat conduction block, and the at least one third groove is configured to at least partially receive the hot end of the second layer of thermotube; and
the plurality of second grooves and the at least one third groove on opposite sides of the second solid heat conduction block are staggered;
wherein the laser comprises a base and a substrate, the base fixes and supports one surface of the substrate, and another surface of the substrate is provided with a light emitting chip which serves as a light emitting surface of the laser; and
wherein the laser light source further comprises:
a housing provided with a laser mounting port, wherein the laser is sleeved in the laser mounting port; and
a sealing element, configured to be interference-fitted between the laser and the housing to seal the laser and the housing, wherein the sealing member comprises a top part and a side part, the top part covers an edge of the light emitting surface of the laser, the side part wraps around the periphery of the base, an inner surface of the side part is press-fitted to each of the base and a lateral surface of the substrate, and an outer surface of the side part is pressed against a lateral surface of the laser mounting port.

2. The laser light source according to claim 1 , wherein a plurality of first grooves are provided on a side of the first solid heat conduction block facing the second solid heat conduction block, and the first grooves and the second grooves form mounting holes in which the hot ends of the first layer of thermotubes are embedded.

3. The laser light source according to claim 2 , wherein a fourth groove is correspondingly provided on a side of the third solid heat conduction block facing the second solid heat conduction block, and the third groove and the fourth groove form a fixing hole in which the hot end of the second layer of thermotube is embedded.

4. The laser light source according to claim 1 , wherein a bending angle of the bent part is in a range of 80° to 140°.

5. The laser light source according to claim 1 , wherein the laser heat dissipation assembly further comprises a fan bracket and a fan securely mounted on the fan bracket, the fan bracket is securely mounted on the fin module, and the cooling fins are all perpendicular to the fan bracket.

6. The laser light source according to claim 1 , wherein an inner surface of the top part is attached to a top surface of the substrate.

7. The laser light source according to claim 1 , wherein a first guiding slope is arranged at a junction between the top part and the side part, and the first guiding slope is inclined along the top part towards the side part.

8. The laser light source according to claim 7 , wherein a top part of the laser mounting port is provided with a second guiding slope, and the second guiding slope is inclined along a lateral surface of the laser mounting port towards a bottom surface of the housing.

9. The laser light source according to claim 1 , wherein a reinforcement corner is provided at a corner of the top part of the sealing element.

10. The laser light source according to claim 9 , wherein a pressure corner is arranged at a corner of the laser mounting port, with a top surface of the pressure corner pressed against an outer surface of the reinforcement corner.

11. The laser light source according to claim 1 , wherein the laser further comprises pins for providing circuitry connection between a circuit board and the laser, a middle of each of a pair of sidewalls of the sealing element is provided with a groove, and the groove of the sealing element is configured to allow the pins to pass through.

12. The laser light source according to claim 11 , wherein a receiving region is defined in the circuit board, the laser is located in the receiving region, and the pins of the laser extend onto a first surface of the circuit board.

13. The laser light source according to claim 1 , wherein the light emitting surface of the laser has a plurality of light emitting regions, and beams emitted from the different light emitting regions are in different colors, and
the laser light source further comprises a light combination mirror assembly, the light combination mirror assembly comprises a plurality of mirrors that are sequentially arranged along an optical transmission path of the laser, with different mirrors corresponding to different light emitting regions; an angle is formed between each of the mirrors and a light emitting direction of a corresponding light emitting region, and at least one of the mirrors allows other reflected beam to pass therethrough.

14. The laser light source according to claim 13 , wherein the laser light source further comprises a lens configured to converge a plurality of beams in different colors that are transferred by the light combination mirror assembly, to create a white beam.

15. The laser light source according to claim 14 , wherein the laser light source further comprises a light stick configured to performing homogenizing process on the white beam converged by the lens.

16. The laser light source according to claim 13 , wherein the plurality of mirrors are dichroic mirrors.

17. The laser light source according to claim 11 , wherein the housing comprises a first bearing part and a second bearing part, the first bearing part is configured to bear the circuit board, and the second bearing part is configured to bear the l

Assignees

• Hisense Laser Display Co Ltd

Inventors

• Tian Xintuan
• Yang Changming
• Zhao Yun
• Cui Lei
• Xing Zhe

Classifications

• H01S5/0071

  for beam steering, e.g. using a mirror outside the cavity to change the beam direction · CPC title

• H01S5/02423

  Liquid cooling, e.g. a liquid cools a mount of the laser · CPC title

• H01S5/02255

  using beam deflecting elements · CPC title

• H01S5/4093

  Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion · CPC title

• H01S5/02476

  Heat spreaders, i.e. improving heat flow between laser chip and heat dissipating elements · CPC title