Reflector system for lighting device

• US 8,529,102 B2
• Filed: 04/06/2009
• Issued: 09/10/2013
• Est. Priority Date: 04/06/2009
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Pickard, Paul Kenneth, Kelley, Ryan
• Primary Examiner(s): Neils, Peggy A.
• Application Number:
  US12/418,796
• Publication Number:
  US 20100254128A1
• Time in Patent Office: 1,618 Days
• Field of Search: 362/231, 362/298, 362/296.01, 362/296.02, 362/311.02, 362/346, 362/348
• US Class Current: 362/298
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 7/0033 with successive reflections from one reflector to the next or following
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A reflector system for a lighting device. The system uses two reflective surfaces to redirect the light before it is emitted. The light source/sources are disposed at the base of a secondary reflector. The first reflective surface is provided by a primary reflector which is arranged proximate to the source/sources. The primary reflector initially redirects, and in some cases diffuses, light from the sources such that the different wavelengths of light are mixed as they are redirected toward the secondary reflector. The secondary reflector functions primarily to shape the light into a desired output beam. The primary and secondary reflectors may be specular or diffuse and may comprise faceted surfaces. The reflector arrangement allows the source to be placed at the base of the secondary reflector where it may be thermally coupled to a housing or another structure to provide an outlet for heat generated by the sources.

Claims

1. A light emitting device, comprising:

a multi-element light source;

a secondary reflector adapted to shape and direct an output light beam; and

a primary reflector having a reflective surface that is disposed proximate to said light source such that substantially all of the light emitted by said light source interacts with said primary reflector and is redirected by said primary reflector from said source toward said secondary reflector, said primary reflector shaped to reflect light from said multi-element source such that the light is spatially mixed prior to incidence on said secondary reflector, said primary reflector positioned entirely within said secondary reflector.

2. The light emitting device of claim 1, further comprising a protective housing that partially surrounds said light source and said primary and secondary reflectors.

3. The light emitting device of claim 2, said protective housing comprising a thermally conductive material, said housing in thermal contact with said light source.

4. The light emitting device of claim 1, further comprising a tube element that surrounds said light source, said tube element extending away from the base of said secondary reflector to said primary reflector.

5. The light emitting device of claim 4, said primary reflector comprising a notch, said tube element cooperating with said notch such that the inner surface of said tube element abuts said notch.

6. The light emitting device of claim 4, said tube element comprising a wavelength conversion material.

7. The light emitting device of claim 1, said light source comprising a singular device having a plurality of light emitting diode (LED) chips, said plurality of LED chips selected to emit at least two different colors of light.

8. The light emitting device of claim 1, said light source comprising a plurality of discreet devices selected to emit at least two different colors of light.

9. The light emitting device of claim 1, wherein said light source emits a combination of colors that yields a white light output.

10. The light emitting device of claim 1, wherein said light source emits red and green light in a combination that yields white light.

11. The light emitting device of claim 1, wherein said light source emits blue and yellow light in a combination that yields white light.

12. The light emitting device of claim 1, said light source comprising a wavelength conversion material.

13. The light emitting device of claim 1, said primary reflector comprising a specular reflector.

14. The light emitting device of claim 13, said primary reflector further comprising a faceted surface.

15. The light emitting device of claim 13, said primary reflector further comprising a polymeric material with a metal coating.

16. The light emitting device of claim 1, said primary reflector comprising a highly reflective specular film on the surface of said primary reflector.

17. The light emitting device of claim 1, said primary reflector comprising a diffuse reflector.

18. The light emitting device of claim 1, said primary reflector comprising a highly reflective diffuse white material.

19. The light emitting device of claim 1, said primary reflector comprising a micro-cellular polyethylene terephthalate (PET) material.

20. The light emitting device of claim 1, said primary reflector having a generally conic surface, said primary reflector disposed with the tip of said conic surface toward said light source.

21. The light emitting device of claim 1, said primary reflector defined by a diametric cross-section that is piecewise linear.

22. The light emitting device of claim 1, said secondary reflector having a generally parabolic shape.

23. The light emitting device of claim 1, said secondary reflector having a shape defined by a first parabolic section closer to the base of said secondary reflector and a second parabolic section farther from the base of said secondary reflector.

24. The light emitting device of claim 1, said secondary reflector comprising a polymeric material coated with a metal.

25. The light emitting device of claim 1, said secondary reflector comprising a metal.

26. The light emitting device of claim 1, said secondary reflector comprising a specular reflector.

27. The light emitting device of claim 1, said secondary reflector comprising a highly reflective specular film on the interior surface of said secondary reflector.

28. The light emitting device of claim 1, said secondary reflector comprising a plurality of adjoined curved panels.

58. The light emitting device of claim 1, wherein said multi-element light source is mounted at the base of said secondary reflector.

59. The light emitting device of claim 1, wherein said multi-element light source is mounted below said primary reflector such that substantially all of the light emitted by said light source interacts with the reflective surface of said primary reflector.

60. The light emitting device of claim 1, wherein the primary reflector is disposed to mix color of the light from the light source.

29. A lamp device, comprising:

a multi-element light source;

a protective housing that surrounds said light source, said housing having an open end through which light may be emitted;

a secondary reflector disposed inside said housing and around said light source such that said light source is positioned at the approximate center of the base of said secondary reflector;

a primary reflector disposed to reflect light emitted from said source toward said secondary reflector such that said light is spatially mixed prior to incidence on said secondary reflector; and

a lens plate disposed over said open end of said housing;

said primary reflector having a reflective surface that is disposed proximate to said light source and entirely within said secondary reflector such that substantially all of the light emitted by said multi-element light source interacts with said primary reflector and is redirected by said primary reflector from said light source toward said secondary reflector.

31. The lamp device of claim 29, wherein said housing comprises a thermally conductive material, said housing in thermal contact with said light source.

32. The lamp device of claim 29, said light source comprising a singular device having a plurality of light emitting diode (LED) chips disposed on said device, said plurality of LED chips selected to emit at least two different colors of light.

33. The lamp device of claim 29, said light source comprising a plurality of discreet devices selected to emit at least two different colors of light.

34. The lamp device of claim 29, wherein said light source emits a combination of light colors that yields a white light output.

35. The lamp device of claim 29, wherein said light source emits red and green light in a combination that yields white light.

36. The lamp device of claim 29, wherein said light source emits blue and yellow light in a combination that yields white light.

37. The lamp device of claim 29, said light source comprising a wavelength conversion material.

38. The lamp device of claim 29, said primary reflector comprising a specular reflector.

39. The lamp device of claim 38, said primary reflector further comprising a faceted surface.

40. The lamp device of claim 38, said primary reflector further comprising a polymeric material with a metal coating.

41. The lamp device of claim 29, said primary reflector comprising a diffuse reflector.

42. The lamp device of claim 29, said primary reflector comprising a highly reflective diffuse white material.

43. The lamp device of claim 29, said primary reflector comprising a micro-cellular polyethylene terephthalate (PET) material.

44. The lamp device of claim 29, said primary reflector having a generally conic surface, said primary reflector disposed with the tip of said conic surface toward said light source.

45. The lamp device of claim 29, said secondary reflector having a generally parabolic shape.

46. The lamp device of claim 29, said secondary reflector comprising a polymeric material coated with a metal.

47. The lamp device of claim 29, said secondary reflector comprising a metal.

48. The lamp device of claim 29, said secondary reflector comprising a specular reflector.

49. The lamp device of claim 29, further comprising a protective conduit shaped to house wires for providing power to said light source.

50. The lamp device of claim 49, said protective conduit adapted to mount to a surface.

51. The lamp device of claim 49, said protective conduit comprising a material that is insulative and flame retardant.

52. The lamp device of claim 29, wherein said secondary reflector is removable from said housing without removing said light source.

53. The lamp device of claim 29, further comprising a tube element that surrounds said light source and extends away from the base of said secondary reflector to said primary reflector.

54. The lamp device of claim 53, said primary reflector comprising a notch, said tube element cooperating with said notch such that the inside surface of said tube abuts against said notch.

55. The lamp device of claim 53, said tube element comprising a wavelength conversion material.

56. The lamp device of claim 29, said primary reflector comprising a highly reflective film on the surface of said primary reflector.

57. The lamp device of claim 29, said secondary reflector comprising a highly reflective film on the interior surface of said secondary reflector.

61. The lamp device of claim 29, wherein the primary reflector is disposed to mix color of the light from the light source.

30. A lamp device, comprising:

a multi-element light source;

a protective housing that surrounds said light source, said housing having an open end through which light may be emitted;

a secondary reflector disposed inside said housing and around said light source such that said light source is positioned at the center of the base of said secondary reflector;

a primary reflector disposed to reflect light emitted from said source toward said secondary reflector such that said light is spatially mixed prior to incidence on said secondary reflector; and

a lens plate disposed over said open end of said housing; and

a mount post extending from said lens plate inward toward said light source, said primary reflector disposed on the end of said mount post proximate to said light source.

62. The lamp device of claim 30, wherein the primary reflector is disposed to mix color of the light from the light source.