Light source with optics to produce a spherical emission pattern

• US 8,922,106 B2
• Filed: 12/22/2009
• Issued: 12/30/2014
• Est. Priority Date: 06/02/2009
• Status: Active Grant

• Current Assignee: Bridgelux Incorporated
• Original Assignee: Bridgelux Incorporated
• Inventors: Helbing, Rene, Scott, Keith, Posselt, Jason
• Primary Examiner(s): Hollweg, Thomas A
• Application Number:
  US12/645,234
• Publication Number:
  US 20100301726A1
• Time in Patent Office: 1,834 Days
• Field of Search: 362/514, 362/516, 362/517, 362/237, 362/240, 362/241, 362/247, 362/249.02, 313/46, 313/498, 313/501, 313/113, 313/114, 313/116, 31331801- 12
• US Class Current: 313/318.11
• 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 7/04 Optical design
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light emitting apparatus includes a substrate, a plurality of solid state light emitting cells having a planar arrangement on the substrate, and one or more reflectors arranged with the solid state light emitting cells so that light emitted from the light source has a substantially spherical emission pattern.

Claims

1. A light source, comprising:

a disc-shaped substrate;

a plurality of solid state light emitting cells having a substantially planar arrangement on the substrate; and

one or more reflectors, each comprising an unbroken surface, the one or more reflectors arranged with the solid state light emitting cells and shaped as a continuous curve so that light emitted from the light source has a substantially spherical emission pattern,

wherein each of the one or more reflectors is cantilevered from an inner edge of the disc-shaped substrate to form a lip that extends partially over a solid state light emitting cell such that an outer edge of the solid state light emitting cell is configured to emit at least a portion of the light in an upward direction past the reflector, and wherein the one or more reflectors is configured to reflect at least a portion of the light in a downward direction.

2. The light source of claim 1 further comprising phosphor arranged with the solid state light emitting cells so that the light emitted from the light source is white light.

3. The light source of claim 1 wherein each of the one or more reflectors is supported by the substrate.

4. The light source of claim 1 wherein each of at least one of the one or more reflectors extends over said at least one of the solid state light emitting cells with an upward incline.

5. The light source of claim 1 wherein the one or more reflectors extend at least partially over all of the solid state light emitting cells.

6. The light source of claim 1 wherein the one or more reflectors comprises one reflector.

7. The light source of claim 1 wherein the one or more reflectors comprise a plurality of reflectors.

8. The light source of claim 7 wherein each of the reflectors extend at least partially over a different one of the solid state light emitting cells.

9. The light source of claim 1 wherein each of the one or more reflectors has a light scattering reflective surface facing the solid state light emitting cells.

10. A light source, comprising:

a disc-shaped substrate;

a plurality of solid state light emitting cells arranged on the substrate to emit light in substantially the same direction; and

one or more reflectors, each comprising an unbroken surface, the one or more reflectors arranged with the solid state light emitting cells and shaped as a continuous curve so that the light is emitted from the light source with a substantially spherical emission pattern;

wherein each of the one or more reflectors is cantilevered from an inner edge of the disc-shaped substrate to form a lip that extends partially over a solid state light emitting cell such that an outer edge of the solid state light emitting cell configured to emit at least a portion of the light in an upward direction past the reflector, and wherein the one or more reflectors is configured to reflect at least a portion of the light in a downward direction.

11. The light source of claim 10 further comprising phosphor arranged with the solid state light emitting cells so that the light emitted from the light source is white light.

12. The light source of claim 10 wherein each of the one or more reflectors is supported by the substrate.

13. The light source of claim 10 wherein each of at least one of the one or more reflectors extends over said at least one of the solid state light emitting cells with an upward incline.

14. The light source of claim 10 wherein the one or more reflectors extend at least partially over all of the solid state light emitting cells.

15. The light source of claim 10 wherein the one or more reflectors comprises one reflector.

16. The light source of claim 10 wherein the one or more reflectors comprise a plurality of reflectors.

17. The light source of claim 16 wherein each of the reflectors extend at least partially over a different one of the solid state light emitting cells.

18. The light source of claim 10 wherein each of the one or more reflectors has a light scattering reflective surface facing the solid state light emitting cells.

19. A light source, comprising:

a disc-shaped substrate;

a plurality of solid state light emitting cells having a substantially planar arrangement on the substrate; and

means for reflecting light emitted from the solid state light emitting cells, the means for reflecting light shaped as a continuous curve so that the light is emitted from the light source with a substantially spherical emission pattern, the light reflecting means comprising an unbroken surface,

wherein the means for reflecting light comprises one or more reflectors, each cantilevered from an inner edge of the disc-shaped substrate to form a lip that extends partially over a solid state light emitting cell such that an outer edge of the solid state light emitting cell is configured to emit at least a portion of the light in an upward direction past the reflector, and wherein the means for reflecting light is configured to reflect at least a portion of the light in a downward direction.

20. The light source of claim 19 further comprising phosphor arranged with the solid state light emitting cells so that the light emitted from the light source is white light.

21. The light source of claim 19 wherein the one or more reflectors is supported by the substrate.

22. The light source of claim 19 wherein each of at least one of the one or more reflectors extends over said at least one of the solid state light emitting cells with an upward incline.

23. The light source of claim 19 wherein the one or more reflectors extend at least partially over all of the solid state light emitting cells.

24. The light source of claim 19 wherein the one or more reflectors comprises one reflector.

25. The light source of claim 19 wherein the one or more reflectors comprise a plurality of reflectors.

26. The light source of claim 25 wherein each of the reflectors extend at least partially over a different one of the solid state light emitting cells.

27. The light source of claim 19 wherein each of the one or more reflectors has a light scattering reflective surface facing the solid state light emitting cells.

28. A lamp, comprising:

a housing having a base and a transparent bulb portion mounted to the base;

a light source within the housing, the light source comprising;

a disc-shaped substrate;

a plurality of solid state light emitting cells having a substantially planar arrangement on the substrate; and

one or more reflectors, each comprising an unbroken surface, the one or more reflectors arranged with the solid state light emitting cells and shaped as a continuous curve so that light emitted from the transparent bulb portion has a substantially spherical emission pattern;

wherein each of the one or more reflectors is cantilevered from an inner edge of the disc-shaped substrate to form a lip that extends partially over a solid state light emitting cell such that an outer edge of the solid state light emitting cell is configured to emit at least a portion of the light in an upward direction past the reflector, and wherein the one or more reflectors is configured to reflect at least a portion of the light in a downward direction.

29. The lamp of claim 28 further comprising phosphor arranged with the solid state light emitting cells so that the light emitted from the transparent bulb portion is white light.

30. The lamp of claim 28 wherein each of the one or more reflectors is supported by the substrate.

31. The lamp of claim 28 wherein each of at least one of the one or more reflectors extends over said at least one of the solid state light emitting cells with an upward incline.

32. The lamp of claim 28 wherein the one or more reflectors extend at least partially over all of the solid state light emitting cells.

33. The lamp of claim 28 wherein the one or more reflectors comprises one reflector.

34. The lamp of claim 28 wherein the one or more reflectors comprise a plurality of reflectors.

35. The lamp of claim 34 wherein each of the reflectors extend at least partially over a different one of the solid state light emitting cells.

36. The lamp of claim 28 wherein each of the one or more reflectors has a light scattering reflective surface facing the solid state light emitting cells.

37. The lamp of claim 28 further comprising a fan arranged within the housing to cool the solid state light emitting cells.

38. The lamp of claim 28 wherein the base is configured to electrically and mechanically mate with a lamp socket.

39. The lamp of claim 28 wherein the base comprises electrical contacts coupled to the solid state light emitting cells.

40. The lamp of claim 39 wherein the base comprises a cap configured to mechanically mate with the lamp socket, the cap comprising one of the electrical contacts.

41. The lamp of claim 40 wherein the base further comprises a tip having another one of the electrical contacts.

42. The lamp of claim 40 wherein the cap comprises a screw cap.

43. A lamp, comprising:

a housing having a base and a transparent bulb portion mounted to the base;

a light source within the housing, the light source comprising a plurality of solid state light emitting cells arranged on a disc-shaped substrate and one or more reflectors, each comprising an unbroken surface, the one or more reflectors arranged with the solid state light emitting cells and shaped as a continuous curve so that light emitted from the light source has a substantially spherical emission pattern;

wherein each of the one or more reflectors is cantilevered from an inner edge of the disc-shaped substrate to form a lip that extends partially over a solid state light emitting cell such that an outer edge of the solid state light emitting cell is configured to emit at least a portion of the light in an upward direction past the reflector, and wherein the one or more reflectors is configured to reflect at least a portion of the light in a downward direction; and

means for cooling the light source.

44. The lamp of claim 43 wherein the means for cooling the light source comprises a fan mounted to the light source to cool the solid state light emitting cells.

45. The lamp of claim 44 wherein the fan comprises an electronic fan.

46. The lamp of claim 43 wherein the means for cooling the light source comprises one or more heat pipes supporting the light source.

47. The lamp of claim 46 wherein the means for cooling the light source further comprises a plurality of spaced apart thermally conductive plates in the base, wherein the one or more heat pipes are arranged with the plates to dissipate heat generated by the solid state light emitting cells.

48. The lamp of claim 46 wherein the means for cooling the light source further comprises a plurality of spaced apart thermally conductive plates in the base, wherein the one or more heat pipes extend through the plates.

49. The lamp of claim 46 wherein the means for cooling the light source further comprises one or more vents in the base, wherein the one or more heat pipes are arranged with the vents to dissipate heat generated by the one or more solid state light emitting cells.

50. The lamp of claim 43 wherein the solid state light emitting cells have a planar arrangement on the substrate.

51. The lamp of claim 43 wherein the solid state light emitting cells are arranged on the substrate to emit light in substantially the same direction.