LUMINAIRE WITH DISTRIBUTED LED SOURCES

• US 20120039073A1
• Filed: 08/12/2010
• Published: 02/16/2012
• Est. Priority Date: 08/12/2010
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: TONG, TAO
• Granted Patent: US 8,764,224 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A wide beam angle (diffuse) luminaire with an efficient multi-source radiative emitter array. Embodiments of the luminaire utilize one or more LEDs disposed around a perimeter of a protective casing. The LEDs are angled to emit into an internal cavity defined by the inner surface of the casing. The placement of the LEDs around the perimeter of the device reduces self-blocking and facilitates heat transfer from the LEDs through the casing or another heat sink and into the ambient. Light impinges on the inner surface and is redirected as useful emission. A diffuse reflective coating may be deposited on the inner surface to mix the light before it is emitted.

Claims

1. A luminaire device, comprising:

a casing having an exit end and an inner surface, said casing defining a cavity; and

at least one radiative source mounted around a perimeter of said casing, said at least one radiative source angled to emit radiation toward said inner surface.

2. The luminaire device of claim 1, said at least one radiative source comprising multiple radiative sources mounted around said perimeter of said casing.

3. The luminaire device of claim 2, said multiple radiative sources comprising sources constructed to emit multiple different spectra.

4. The luminaire device of claim 2, said multiple radiative sources comprising sources constructed to emit a single spectrum.

5. The luminaire device of claim 2, wherein said multiple radiative sources are mounted around said perimeter of said casing such that said radiative sources are evenly spaced.

6. The luminaire device of claim 1, said inner surface coated with a reflective material layer.

7. The luminaire of claim 6, wherein said reflective material layer is diffuse reflective.

8. The luminaire of claim 6, wherein said reflective material layer is specular reflective.

9. The luminaire of claim 6, wherein said reflective material layer is selected to provide a partially diffuse and partially specular reflection.

10. The luminaire device of claim 6, further comprising a wavelength conversion material mixed into said reflective material layer.

11. The luminaire device of claim 1, further comprising at least one mounting beam that extends from an edge of said casing into said cavity, each of said at least one radiative sources mounted to a respective one of said at least one mounting beams.

12. The luminaire device of claim 1, further comprising a faceplate mounted over said exit end such that light emitted from the cavity passes through said faceplate.

13. The luminaire device of claim 12, said faceplate comprising a diffuser.

14. The luminaire device of claim 12, said faceplate comprising a wavelength conversion material.

15. The luminaire device of claim 12, said faceplate comprising light scattering particles.

16. The luminaire device of claim 1, further comprising a heat sink in thermal contact with said casing.

17. The luminaire device of claim 1, said inner surface comprising a wavelength conversion material.

18. The luminaire device of claim 1, further comprising a lens mounted over said exit end to shape the output beam profile.

19. The luminaire device of claim 1, further comprising a specular collimating cone mounted over said exit end.

20. The luminaire device of claim 1, said at least one radiative source comprising at least one light emitting diode (LED) constructed to emit light in the visible spectrum.

21. The luminaire device of claim 1, further comprising a remote wavelength conversion element.

22. The luminaire device of claim 1, further comprising a remote diffuser.

23. A luminaire device, comprising:

a casing having an exit end and an inner surface, said casing defining a cavity; and

a plurality of light emitters disposed around a perimeter of said casing at said exit end, each of said light emitters angled to emit light toward said inner surface.

24. The luminaire device of claim 23, said plurality of emitters constructed to emit multiple different spectra.

25. The luminaire device of claim 23, said plurality of emitters constructed to emit a single spectrum.

26. The luminaire device of claim 23, wherein said plurality of emitters are mounted around said perimeter of said casing such that said radiative sources are evenly spaced.

27. The luminaire device of claim 23, said inner surface coated with a reflective material.

28. The luminaire device of claim 27, wherein said reflective material is diffuse reflective.

29. The luminaire device of claim 27, wherein said reflective material is specular reflective.

30. The luminaire device of claim 27, wherein said reflective material is both diffuse reflective and specular reflective.

31. The luminaire device of claim 27, further comprising a wavelength conversion material mixed in with said reflective material.

32. The luminaire device of claim 23, further comprising a plurality of mounting beams that extend from an edge of said casing into said cavity, each of said emitters mounted to a respective one of said mounting beams.

33. The luminaire device of claim 23, further comprising a faceplate mounted over said exit end such that light emitted from the cavity passes through said faceplate.

34. The luminaire device of claim 33, said faceplate comprising a diffuser.

35. The luminaire device of claim 33, said faceplate comprising a wavelength conversion material.

36. The luminaire device of claim 33, said faceplate comprising light scattering particles.

37. The luminaire device of claim 23, further comprising a lens mounted over said exit end to shape the output beam profile.

38. The luminaire device of claim 23, further comprising a specular collimating cone mounted over said exit end.

39. The luminaire device of claim 23, said plurality of emitters comprising at least one light emitting diode (LED) constructed to emit light in the visible spectrum.

40. The luminaire device of claim 23, said plurality of emitters comprising LEDs of a first color and LEDs of a second color, said first and second color LEDs disposed around said perimeter of said casing in an alternating fashion.

41. The luminaire device of claim 23, further comprising a remote wavelength conversion element.

42. The luminaire device of claim 23, further comprising a remote diffuser.

43. The luminaire device of claim 23, further comprising a transparent ring structure disposed around the inner perimeter of said casing at the exit end, said light emitters disposed within said ring structure.

44. The luminaire device of claim 43, said ring structure comprising at least one roughened surface.