SOLID STATE LAMP AND BULB

• US 20110215699A1
• Filed: 02/16/2011
• Published: 09/08/2011
• Est. Priority Date: 03/03/2010
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Pickard, Paul, Van De Ven, Antony, Negley, Gerald, Keller, Bernd, Lay, James Michael, Tarsa, Eric, Medendorp, Nicholas W. JR., Le, Long Larry, Letoquin, Ronan, Tong, Tao, Youmans, Mark, Lowes, Theodore
• Granted Patent: US 9,062,830 B2
• Time in Patent Office: Days
• US Class Current: 313/46
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/642 characterized by the shape

Abstract

Solid state lamps and bulbs comprising different combinations and arrangements of a light source, one or more wavelength conversion materials, regions or layers which are positioned separately or remotely with respect to the light source, and a separate diffuser. These are arranged on a heat sink in a manner that allows for the fabrication of lamps and bulbs that are efficient, reliable and cost effective and can provide an essentially omni-directional emission pattern, even with a light source comprised of a co-planar arrangement of LEDs. Additionally, this arrangement allows aesthetic masking or concealment of the appearance of the conversion regions or layers when the lamp is not illuminated. Various embodiments of the invention may be used to address many of the difficulties associated with utilizing efficient solid state light sources such as LEDs in the fabrication of lamps or bulbs suitable for direct replacement of traditional incandescent bulbs. Embodiments of the invention can be arranged to fit recognized standard size profiles such as those ascribed to commonly used lamps such as incandescent light bulbs, while still providing emission patterns that comply with ENERGY STAR® standards.

Claims

1. A lighting device, comprising:

a light source on a heat sink;

a diffuser on said heat sink and spaced apart from said light source; and

a wavelength conversion material on said heat sink and disposed between the light source and the diffuser and spaced from the light source and the diffuser, wherein said lamp is arranged to fit within the A19 envelope while emitting a substantially uniform emission pattern.

2. The lighting device of claim 1, emitting an emission pattern that complies with the ENERGY STAR®

requirements.

3. The lighting device of claim 1, wherein said light source comprises one or more light emitting diodes.

4. The lighting device of claim 1, wherein said wavelength conversion material comprises a phosphor carrier having a thermally conductive material.

5. The lighting device of claim 1, wherein said diffuser comprises a diffuser dome.

6. The lighting device of claim 1, wherein said diffuser comprises a diffusing material, wherein said diffuser has one or more areas covered by a greater amount of diffusing material.

7. The lighting device of claim 1, wherein said diffuser disperses light from said light source and/or said wavelength conversion material.

8. The lighting device of claim 1, wherein said wavelength conversion material is three-dimensional.

9. The lighting device of claim 1, wherein said wavelength conversion material is planar.

10. The lighting device of claim 1, wherein said wavelength conversion material is substantially frusto-spherical.

11. The lighting device of claim 1, wherein said diffuser is substantially frusto-spherical.

12. The lighting device of claim 1, wherein said wavelength conversion material and said diffuser are substantially frusto-spherical such that said wavelength conversion material phosphor and diffuser provide a double-dome structure.

13. The lighting device of claim 1, wherein said diffuser at least partially conceals the appearance of said wavelength conversion material when said lighting device is not operating.

14. The lighting device of claim 13, wherein said diffuser exhibits a white appearance with said lighting device is not operating.

15. The lighting device of claim 1, providing a steady state lumen output of at least 800 lumens.

16. The lighting device of claim 1, providing a steady state lumen output of 65 lumens per watt or more.

17. The lighting device of claim 1, providing a steady state lumen output of 80 lumens per watt or more.

18. The lighting device of claim 16, operating from less than 10 watts.

19. The lighting device of claim 1, providing a steady state output of 800 lumens at 10 watts or less.

20. The lighting device of claim 1, further comprising a protective layer to cover electrically conducting features below said diffuser dome and wavelength conversion material.

21. The lighting device of claim 1, wherein said light sources are mounted on a printed circuit board that is mounted to said heat sink, further comprising a protective layer to cover electrically conducting features on said PCB.

22. The lighting device of claim 1, emitting light with a color rendering index (CRI) of greater than 80.

23. The lighting device of claim 1, emitting light with a color rendering index (CRI) of greater than 90.

24. The lighting device of claim 1, wherein the light emitted from the diffuser has a spatial uniformity that is within 20% of a mean value within a range of viewing angles.

25. The lighting device of claim 24, wherein said range of viewing angles is 0 to 135°

.

26. The lighting device of claim 24, having greater than 5% of total luminous flux in the 135 to 180°

viewing angles.

27. The lighting device of claim 1, wherein the lower edge of said phosphor carrier is higher than the lower edge of said diffuser dome.

28. A lighting device, comprising:

a light source on a heat sink;

a diffuser on said heat sink and spaced apart from said light source; and

a wavelength conversion material on said heat sink and disposed between the light source and the diffuser and spaced from the light source and the diffuser, wherein said heat sink comprises a plurality of heat fins each having a lower angled portion that angles out from the central axis of said lighting device, and an upper portion that angles back toward said central axis, emitting a substantially uniform emission pattern.

29. The lighting device of claim 28, arranged to fit an A19 size envelope.

30. The lighting device of claim 28, wherein said diffuser comprises a diffuser dome and said heat fins do not extend beyond outer lateral edge of said diffuser dome.

31. The lighting device of claim 28, wherein said wavelength conversion material and said diffuser are substantially frusto-spherical such that said phosphor carrier and diffuser form a double-dome structure.

32. The lighting device of claim 28, wherein said heat sink comprise 20 to 60 heat fins.

33. The lighting device of claim 28, wherein said heat sink comprises 30 to 50 heat fins.

34. The lighting device of claim 28, wherein said heat sink comprises approximately 38 heat fins.

35. The lighting device of claim 28, wherein said lower section has an angle of 150°

or more from said lighting device central axis.

36. The lighting device of claim 28, wherein said upper section has a measured angle of 60°

or less.

37. The lighting device of claim 28, wherein said upper section has a measured angle of 50°

or less.

38. The lighting device of claim 28, wherein said upper section has a measured angle of approximately 42°

.

39. A solid state lamp, comprising:

a heat sink with a plurality of heat fins;

a solid state light source mounted on said heat sink;

a phosphor carrier on said heat sink, over and spaced apart from said light source; and

a diffuser on said heat sink, over and spaced apart from said phosphor carrier, wherein said phosphor carrier and said diffuser are substantially frusto-spherical such that said phosphor carrier and diffuser provide a double-dome structure, wherein said lamp fits within an standard size profile, and emits a substantially uniform emission pattern.

40. The solid state lamp of claim 39, wherein said standard size envelope includes one from the group A19, A21 and A23.

41. The solid state lamp of claim 39, wherein substantially uniform emission pattern meets ENERGY STAR®

emission requirements.

42. The solid state lamp of claim 39, providing a steady state output of 800 lumens at 10 watts or less.

43. The solid state lamp of claim 39, wherein said heat fins to not extend beyond the lateral edge of said diffuser.

44. The solid state lamp of claim 39, wherein said diffuser comprises a diffusing material one or more different concentrations along said frusto-spherical shape.

45. A solid state lamp, comprising solid state light source emitting light with an efficacy of 80 lumens per watt or more, and having a color rendering index of greater than 80.

46. The lamp of claim 45, emitting light having a color rendering index at or greater than 90.

47. The lamp of claim 45, further comprising a remote diffuser dome.

48. The lamp of claim 45, further comprising a remote phosphor.

49. The lamp of claim 45, further comprising a phosphor carrier.

50. A solid state lamp, comprising solid state light source emitting light with an efficacy of 80 lumens per watt or more, and fitting within an A19 size envelope.

51. A solid state lamp, comprising solid state light source emitting light with an efficacy of 80 lumens per watt or more, and having an emission pattern compliant with ENERGY STAR®

performance requirements.

52. A solid state lamp, comprising solid state light source emitting light with an efficacy of 80 lumens per watt or more from 10 watts or less.

53. A solid state lamp, comprising solid state light source emitting light with an efficacy of 80 lumens per watt or more, and having a double dome diffuser and conversion material arrangement.

54. A solid state lamp, comprising solid state light source emitting light with an efficacy of 80 lumens per watt or more, and having a color temperature of 3000 Kelvin or less.

55. The lamp of claim 54, emitting light having a color temperature of 2700 Kelvin or less.

56. A solid state lamp, comprising solid state light source emitting light with an efficacy of 80 lumens per watt or more, and having a lifetime of greater than 25,000 hours or more.

57. A solid state lamp, comprising solid state light source emitting light with an efficacy of 80 lumens per watt or more, and having a lifetime of 50,000 hours or more.