Lamp with remote LED light source and heat dissipating elements

• US 9,234,655 B2
• Filed: 09/07/2012
• Issued: 01/12/2016
• Est. Priority Date: 02/07/2011
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Progl, Curt, Athalye, Praneet, Negley, Gerald
• Primary Examiner(s): Williams, Joseph L
• Application Number:
  US13/607,300
• Publication Number:
  US 20130113358A1
• Time in Patent Office: 1,222 Days
• Field of Search: 362/273, 362/249.02, 362/294, 313/46
• US Class Current: 1/1
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 15/02 Cages
• CPC Class Codes: F21V 29/505 of reflectors
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/58 characterised by the coolants
• CPC Class Codes: F21V 29/77 with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
• CPC Class Codes: F21V 29/85 characterised by the material liquid coolants F21V29/56
• CPC Class Codes: F21V 29/86 Ceramics or glass
• CPC Class Codes: F21V 29/87 Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

LED based lamps and bulbs are disclosed that comprise an elevating element to arrange LEDs above the lamp or bulb base. The elevating element can at least partially comprise a thermally conductive material. A heat sink structure is included, with the elevating element thermally coupled to the heat sink structure. A diffuser can be arranged in relation to the LEDs so at least some light from the LEDs passes through the diffuser and is dispersed into the desired emission pattern. Some lamps and bulbs utilize a heat pipe for the elevating elements, with heat from the LEDs conducting through the heat pipe to the heat sink structure where it can dissipate in the ambient. The LED lamps can include other features to aid in thermal management and to produce the desired emission pattern, such as internal optically transmissive and thermally conductive materials, and heat sinks with different heat fin arrangements.

Claims

1. A solid state lamp, comprising:

a solid state light source;

a lamp base at least partially comprising a heat conductive material;

an elongated elevating element mounted to said lamp base with said light source mounted to said elevating element such that said solid state light source is above said lamp base, said elevating element being at least partially heat conductive;

a diffuser to diffuse light emitting from said lamp into a desired emission pattern, and

an optically transmissive material in said diffuser, wherein said optically transmissive material is thermally conductive.

2. The lamp of claim 1, wherein said optically transmissive material conducts heat from said solid state light source to the ambient.

3. The lamp of claim 1, wherein said optically transmissive material comprises one or more conversion materials.

4. The lamp of claim 1, wherein said optically transmissive material comprises scattering particles.

5. The lamp of claim 1, further comprising an internal light transmissive enclosure forming an inner envelope within said diffuser.

6. The lamp of claim 5, wherein said optically transmissive material is within said inner envelope.

7. The lamp of claim 1, wherein said solid state light source comprises a plurality of light emitting diodes (LEDs).

8. The lamp of claim 1, wherein said solid state light source comprises a plurality of LEDs, each of which is emitting in a different direction.

9. The lamp of claim 1, wherein said elevating element comprises a heat pipe.

10. The lamp of claim 1, wherein said light source comprises one or more LEDs.

11. The lamp of claim 1, wherein said light sources are in thermal contact with said elevating element, and said elevating element is in thermal contact with said lamp base.

12. The lamp of claim 1, comprising a thermally conductive path from said light source, through said elevating element, to said lamp base and to the ambient.

13. The lamp of claim 1, wherein said emission pattern is omnidirectional.

14. The lamp of claim 1, wherein said lamp base comprises a heat sink.

15. The lamp of claim 14, wherein said lamp base comprises heat fins.

16. The lamp of claim 15, wherein at least some of said heat fins extend from said lamp base to at least partially surround said elevating element and/or said solid state light source.

17. The lamp of claim 15, wherein said heat fins extend along the surface of said diffuser.

18. The lamp of claim 15, wherein said heat fins comprise a bird cage structure around said elevating element and/or said solid state light source.

19. The lamp of claim 15, wherein said heat fins widen moving down said lamp base away from said light source.

20. The lamp of claim 15, wherein said heat fins widen moving down said lamp.

21. The lamp of claim 1, wherein said lamp base comprises an electrical connector and/or a power supply unit.

22. The lamp of claim 1, wherein said light source is mounted to said elevating element with the other end of said elevating element mounted to said lamp base.

23. The lamp of claim 1, further comprising a conductive block mounted to and in thermal contact with said elevating element, said light source mounted to said conductive block.

24. The lamp of claim 23, wherein said solid state light source comprises a plurality of LEDs, with at least some of said LEDs mounted on different surfaces of said conductive block.

25. The lamp of claim 1, wherein said emission pattern comprises intensity variation of approximately +20 percent or less.

26. The lamp of claim 1, wherein said emission pattern comprises an intensity variation of approximately +15 percent or less.

27. The lamp of claim 1, wherein said elongating element comprises more than one heat pipe.

28. The lamp of claim 1, wherein said emission pattern comprises intensity variation of approximately +20 percent or less.

29. A solid state lamp, comprising:

a solid state light source;

an elongated elevating element mounted to a lamp base with said light source mounted to said elevating element such that said light source is above said lamp base, said elevating element being at least partially heat conductive;

a lamp base at least partially comprising a heat conductive material, said lamp base further comprising heat fins, at least some of which extend above the top surface of said lamp base to at least partially surround said elevating elements and said light source.

30. The lamp of claim 29, wherein said fins form a bird cage structure around said light source.

31. The lamp of claim 30, wherein said heat fins extend different distances above the top surface of said lamp base.

32. The lamp of claim 29, wherein said heat fins extend above said lamp base to form a cup-like structure around said elevating element and said light source.

33. The lamp of claim 29, further comprising an optically transparent enclosure holding an optically transmissive material.

34. The lamp of claim 33, wherein said optically transmissive material is thermally conductive.

35. The lamp of claim 33, wherein said optically transmissive material comprises one or more conversion materials.

36. The lamp of claim 33, wherein said optically transmissive material comprises scattering particles.

37. The lamp of claim 33, further comprising an internal light transmissive enclosure forming an inner envelope within said optically transparent enclosure.

38. The lamp of claim 37, wherein said optically transmissive material is within said inner envelope.

39. The lamp of claim 33, wherein said elevating element comprises a heat pipe.

40. The lamp of claim 29, wherein said light sources are in thermal contact with said elevating element, and said elevating element is in thermal contact with said lamp base.

41. The lamp of claim 29, further comprising a conductive block mounted to and in thermal contact with said elevating element, said light source mounted to said conductive block.

42. A solid state lamp, comprising:

a thermally conductive elongated elevating element and a solid state light source mounted to said elevating element;

a lamp base, said elevating element mounted to said lamp base such that said solid state light source is above said lamp base;

an outer enclosure at least partially surrounding said elevating element and said solid state light source; and

an optically transmissive material at least partially filling said outer enclosure, wherein said optically transmissive material is thermally conductive.

43. The lamp of claim 42, wherein said optically transmissive material conducts heat from said solid state light source to said ambient.

44. The lamp of claim 42, wherein said optically transmissive material comprises one or more conversion materials.

45. The lamp of claim 42, wherein said optically transmissive material comprises scattering particles.

46. The lamp of claim 42, further comprising an internal enclosure forming an inner envelope within said outer enclosure.

47. The lamp of claim 46, wherein said optically transmissive material is within said inner envelope.

48. The lamp of claim 42, wherein said lamp base comprises heat fins.

49. The lamp of claim 48, wherein at least some of said heat fins extend from said lamp base to at least partially surround said elevating element and/or said solid state light source.

50. The lamp of claim 48, wherein said heat fins extend along the surface of said outer enclosure.

51. The lamp of claim 48, wherein said heat fins comprise a bird cage structure around said elevating element and/or said solid state light source.

52. A solid state lamp, comprising:

a solid state light source;

an elongated elevating element mounted to said lamp with said light source mounted to said elevating element, said elevating element being at least partially heat conductive;

a lamp base at least partially comprising a heat conductive material, said lamp base further comprising heat fins, at least some of which widen moving down said lamp base.

53. The lamp of claim 52, further comprising an outer enclosure at least partially surrounding said elevating element and said solid state light source, and an optically transmissive material at least partially filling said outer enclosure.

54. The lamp of claim 53, wherein said optically transmissive material is thermally conductive.

55. The lamp of claim 53, wherein said optically transmissive material conducts heat from said solid state light source to the ambient.

56. The lamp of claim 53, wherein said optically transmissive material comprises one or more conversion materials.

57. The lamp of claim 53, further comprising an internal enclosure forming an inner envelope within said outer enclosure.

58. The lamp of claim 53, wherein said optically transmissive material is within said inner envelope.