LED fixture with heat pipe

• US 9,423,117 B2
• Filed: 12/30/2011
• Issued: 08/23/2016
• Est. Priority Date: 12/30/2011
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Athalye, Praneet
• Primary Examiner(s): Santiago, Mariceli
• Application Number:
  US13/341,741
• Publication Number:
  US 20130170210A1
• Time in Patent Office: 1,698 Days
• Field of Search: 362/294, 362/373
• US Class Current: 1/1
• CPC Class Codes: F21V 29/503 of light sources cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H01L33/64
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/71 using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
• CPC Class Codes: F21V 29/717 using split or remote units thermally interconnected, e.g. by thermally conductive bars or heat pipes
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light assembly fixture comprising a heat pipe to dissipate heat from the light emitting device, such as but not limited to a light emitting diode (LED). The assembly further comprises a housing including a front surface, a light emitting device on a first heat spreader remote from the front surface, a first end of a heat pipe in thermal contact with the first heat spreader and the heat pipe extending towards the front surface such that a second end of the heat pipe is in thermal contact with a second heat spreader that is disposed on the housing, wherein the first heat spreader, heat pipe and second heat spreader are configured to provide a thermal path to dissipate heat from the light emitting device.

Claims

1. A lighting assembly, comprising:

a housing;

a first heat spreader;

a light emitting device remote from said housing and in thermal communication with said first heat spreader;

a heat pipe comprising a first end and a second end, said first end in thermal communication with said first heat spreader, said heat pipe adapted to provide structural support for said first heat spreader, said first heat spreader comprising an opening along a central vertical axis to receive said first end; and

a second heat spreader in thermal communication with said housing, said second end of said heat pipe extending through said housing and in thermal communication with said second heat spreader, said first heat spreader, said heat pipe and said second heat spreader comprising parallel central vertical axes, wherein said housing comprises a thermally conductive material, wherein said second heat spreader is on an external surface of said housing, and said external surface is thermally conductive and in thermal communication with said light emitting device.

2. The lighting assembly of claim 1, wherein said light emitting device is mounted to a surface of said first spreader facing said housing.

3. The lighting assembly of claim 1, wherein said first spreader is on said first end of said heat pipe.

4. The lighting assembly of claim 1, wherein said second spreader is on said housing.

5. The lighting assembly of claim 1, said housing further comprising a front surface and a back surface opposite the front surface.

6. The lighting assembly of claim 5, said housing further comprising sidewalls adjacent said front surface.

7. The lighting assembly of claim 6, wherein said sidewalls are configured to be angled, curved, multi-faceted or a combination thereof.

8. The lighting assembly of claim 1, said second heat spreader comprising an opening to receive said second end of said heat pipe.

9. The lighting assembly of claim 1, said housing comprising a diffuse white reflector.

10. The lighting assembly of claim 1, wherein at least a portion of said first heat spreader is exposed to the ambient of said housing.

11. The lighting assembly of claim 1, said first heat spreader comprising a mount surface to mount said light emitting device.

12. The lighting assembly of claim 1, wherein said light emitting device emits substantially all light towards said housing.

13. The lighting assembly of claim 1, wherein said light emitting device comprises a plurality of light emitting diodes (LEDs) on said first heat spreader.

14. The lighting assembly of claim 13, wherein said plurality of LEDs emit white light during operation.

15. The lighting assembly of claim 1, wherein the length of said heat pipe determines the separation between said light emitting device and said housing.

16. The lighting assembly of claim 1, said housing comprising metal, steel, aluminum or a combination thereof.

17. A lighting assembly, comprising:

a housing;

a first heat spreader;

a light emitting device remote from said housing and thermal communication with said first heat spreader;

a heat pipe comprising a first end and a second end, said first end in thermal communication with said first heat spreader, said heat pipe adapted to provide structural support for said first heat spreader; and

a second heat spreader in thermal communication with said housing, said second end of said heat pipe in thermal communication with said second heat spreader, wherein said housing comprises a thermally conductive material, wherein said second heat spreader is on an external surface of said housing, said external surface is thermally conductive and in thermal communication with said light emitting device, said first heat spreader further comprising a reflector adjacent said light emitting device.

18. A lighting assembly, comprising:

a housing comprising a front surface;

a first heat spreader;

a light emitting device mounted on said first heat spreader;

a plurality of heat pipes in thermal communication with said first heat spreader, wherein at least two of said heat pipes have a thermal path to said first heat spreader independent from the other heat pipes; and

a plurality of second heat spreaders on said housing, wherein each of said plurality of second heat spreaders is in thermal communication with a respective one of said plurality of heat pipes, wherein said plurality of heat pipes extend through said housing, wherein said housing comprises a thermally conductive material, wherein said plurality of second heat spreaders are on an external surface of said housing, said external surface is thermally conductive and in thermal communication with said light emitting device.

19. The lighting assembly of claim 18, said housing further comprising sidewalls adjacent said front surface.

20. The lighting assembly of claim 19, wherein said plurality of second heat spreaders are on an external surface of said sidewalls of said housing.

21. The lighting assembly of claim 19, wherein said sidewalls are configured to be angled, curved, multi-faceted or a combination thereof.

22. The lighting assembly of claim 18, wherein said plurality of heat pipes extend from said first heat spreader towards said sidewalls.

23. The lighting assembly of claim 18, wherein said plurality of heat pipes are adapted to provide structural support for said first heat spreader.

24. The lighting assembly of claim 18, wherein said front surface is unobstructed.

25. The lighting assembly of claim 18, wherein said first and second heat spreaders comprise an opening to receive said respective heat pipe.

26. The lighting assembly of claim 18, said housing comprising a diffuse white reflector.

27. The lighting assembly of claim 18, wherein said front surface of said housing is planar.

28. The lighting assembly of claim 18, wherein said front surface of said housing is curved.

29. The lighting assembly of claim 18, wherein at least a portion of said first heat spreader is exposed to the ambient outside of said housing.

30. The lighting assembly of claim 18, wherein said light emitting device emits substantially all light towards said housing.

31. The lighting assembly of claim 18, wherein said light emitting device comprises a plurality of light emitting diodes (LEDs) on said first heat spreader.

32. The lighting assembly of claim 31, wherein said plurality of LEDs emit white light during operation.

33. The lighting assembly of claim 18, said housing formed of a thermally conductive material to dissipate heat from said second heat spreader.

34. The lighting assembly of claim 33, said housing comprising metal, steel, aluminum or a combination thereof.

35. A lighting assembly, comprising:

a housing comprising a front surface;

a light emitting device remote from said housing and facing said housing, wherein said light emitting device is in thermal communication with said housing, wherein said housing comprises a thermally conductive material, wherein said light emitting device emits substantially all light towards said front surface; and

a heat pipe coupled to said housing and said light emitting device to form a thermal path between the light emitting device and said housing, wherein said heat pipe extends through a central vertical axis of a first heat spreader and exposes a portion of said heat pipe opposite said light emitting device.

36. The lighting assembly of claim 35, said light emitting device on said first heat spreader, such that said first heat spreader is in thermal communication with said heat pipe.

37. The lighting assembly of claim 35, wherein said housing is thermally conductive and comprises a second heat spreader on said housing and coupled to said heat pipe.

38. The lighting assembly of claim 35, said housing further comprising at least one connector, said at least one connector adapted to receive a dome-type lens such that said dome-type lens is attached to said housing.

39. A lighting assembly, comprising:

a housing comprising a front surface;

a light emitting device remote from said housing, wherein said light emitting device is in thermal communication with said housing, wherein said housing comprises a thermally conductive material, wherein said light emitting device emits substantially all light towards said front surface;

a heat pipe coupled to said housing and said light emitting device to form a thermal path between the light emitting device and said housing, wherein said heat pipe extends through said first heat spreader and exposes a portion of said heat pipe opposite said light emitting device; and

a dome-type lens configured to contact the housing and encase the light emitting device, wherein said portion of exposed heat pipe is adapted to receive said dome-type lens and lock in place.

40. A lighting assembly, comprising:

a light emitting device mounted on a first heat spreader;

a second heat spreader remote from said first heat spreader;

a heat pipe coupled to and extending between said first and said second heat spreaders, wherein said heat pipe extends through a central vertical axis of said light emitting device and said first heat spreader, wherein said heat pipe is adapted to provide structural support for said first heat spreader;

a housing that surrounds said light emitting device, said housing comprising light diffusing properties, wherein said heat pipe extends through said housing, wherein said second heat spreader is on an external surface of said housing, wherein said second heat spreader is in thermal communication with said external surface through at least an additional thermal path independent of said heat pipe.

41. The lighting assembly of claim 40, wherein said lighting assembly is a troffer light.

42. The lighting assembly of claim 40, wherein said lighting assembly is a recessed light.

43. The lighting assembly of claim 40, wherein said second heat spreader is adapted to be mounted to a ceiling.

44. The lighting assembly of claim 40, further comprising:

a base adapted to be mounted to a ceiling and receive said heat pipe.

45. The lighting assembly of claim 44, wherein said second heat spreader is on said housing.

46. The lighting assembly of claim 40, wherein said heat pipe is comprised of a plurality of portions.

47. The lighting assembly of claim 46, wherein said heat pipe comprises a first portion, a second portion and a third portion.

50. The lighting assembly of claim 40, wherein substantially all light emitted from said light emitting device is substantially emitted towards said housing prior to being emitted from said housing, such that said lighting assembly is an indirect light source.

48. A lighting assembly, comprising:

a light emitting device mounted on a first heat spreader;

a second heat spreader remote from said first heat spreader; and

a heat pipe coupled to and extending between said first and said second heat spreaders, wherein said heat pipe is comprised of a plurality of portions, wherein said heat pipe comprises a first portion, a second portion and a third portion, wherein said first and third portions are formed of materials having higher thermal conductivity than the material of said second portion.

49. A lighting assembly, comprising:

a light emitting device mounted on a first heat spreader;

a second heat spreader remote from said first heat spreader;

a heat pipe coupled to and extending between said first and said second heat spreaders, wherein said heat pipe is adapted to provide structural support for said first heat spreader, wherein said heat pipe comprises a first portion, a second portion and a third portion, wherein said second portion is a flexible heat conduit; and

a housing that surrounds said light emitting device, said housing comprising light diffusing properties, wherein said heat pipe extends through said housing.