Luminaires utilizing edge coupling

Patent metadata

Field	Value
Publication number	US-9645303-B2
Application number	US-201414472035-A
Country	US
Kind code	B2
Filing date	Aug 28, 2014
Priority date	Mar 15, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A luminaire includes at least first and second waveguides. The first waveguide has a first coupling surface extending between a first surface and a second surface opposite the first surface, and the second waveguide has a second coupling surface extending between a third surface and a fourth surface opposite the third surface. The first and second coupling surfaces define a coupling cavity. The luminaire further includes at least one light source within the coupling cavity.

First claim

We claim:

1. A luminaire, comprising:
a first waveguide and a second waveguide, each of the first and second waveguides having a first end and a second end, wherein the first waveguide comprises a first coupling surface extending between a first surface and a second surface opposite the first surface, wherein the second waveguide comprises a second coupling surface extending between a third surface and a fourth surface opposite the third surface, and wherein the first and second coupling surfaces define a coupling cavity extending along a length dimension of the first and the second waveguides between the first end and the second end and the coupling cavity separating the first waveguide and the second waveguide;
at least one light source within the coupling cavity; and
a light diverter disposed in the coupling cavity, wherein the light diverter extends along the length dimension of the first and second waveguides.

2. The luminaire of claim 1 , further comprising a first structural member and a second structural member, and wherein the first and second coupling surfaces of the respective first and second waveguides are disposed between the first and second structural members.

3. The luminaire of claim 2 , wherein the light source is carried by the first structural member, and wherein the second structural member comprises a reflective inner surface opposite the light source.

4. The luminaire of claim 2 , wherein the light source is carried by the first structural member, and wherein the second structural member comprises the light diverter on an inner surface opposite the light source.

5. The luminaire of claim 2 , wherein the light source is carried by the first structural member, and wherein the second member comprises a plurality of light diverters on an inner surface opposite the light source.

6. The luminaire of claim 1 , wherein the first and second coupling surfaces are planar.

7. The luminaire of claim 1 , wherein the first and second coupling surfaces are disposed at a non-zero angle relative to one another.

8. The luminaire of claim 7 , wherein the first and second coupling surfaces are disposed at an angle between about 45 degrees and about 100 degrees.

9. The luminaire of claim 7 , wherein the first waveguide comprises a first body comprising a first lateral extent defined by the first and second surfaces, wherein the second waveguide comprises a second body comprising a second lateral extent defined by the third and fourth surfaces, and wherein at least one of the first and second waveguides comprises a curved portion adjacent the coupling cavity and a planar portion distal to the coupling cavity.

10. The luminaire of claim 9 , wherein each of the curved portions of the first and second waveguides enables light emitted from the light source to totally internally reflect within the respective curved portion into the respective body of the respective waveguide.

11. The luminaire of claim 7 , wherein the first and second coupling surfaces are spaced to form a gap therebetween.

12. The luminaire of claim 11 , wherein a reflector is disposed at the gap.

13. The luminaire of claim 7 , wherein the first and second coupling surfaces are spaced from a structural member to form first and second gaps, respectively, therebetween.

14. The luminaire of claim 13 , wherein reflectors are disposed at the first and second gaps.

15. The luminaire of claim 1 , further comprising a plurality of light sources separated by a plurality of dividers extending from a structural member supporting at least one of the first and second waveguides.

16. The luminaire of claim 15 , wherein the dividers comprise first and second sides.

17. The luminaire of claim 16 , wherein the first and second sides of the dividers are planar.

18. The luminaire of claim 16 , wherein the first and second sides form an angle of approximately 45 degrees.

19. The luminaire of claim 15 , wherein the dividers separate the plurality of light sources into groups of three.

20. The luminaire of claim 15 , wherein the dividers extend fully to the coupling surfaces.

21. The luminaire of claim 15 , wherein the dividers comprise an outer edge having a curved shape.

22. The luminaire of claim 15 , further comprising a further structural member supporting at least one of the first and second waveguides, wherein the first and second coupling surfaces of the respective first and second waveguides are disposed between the structural member and the further structural member, and wherein the dividers extend fully to the further structural member.

23. The luminaire of claim 1 , wherein the first and second coupling surfaces comprise a spacing of less than substantially 10 mm.

24. The luminaire of claim 23 , wherein the first and second coupling surfaces comprise a spacing of substantially 4 mm.

25. The luminaire of claim 1 , wherein at least one of the first and second waveguides exhibits a coupling efficiency of at least 80%.

26. The luminaire of claim 1 , wherein at least one of the first and second waveguides exhibits a coupling efficiency of at least 90%.

27. The luminaire of claim 1 , wherein the light source is at least one LED and further comprising a structural member disposed adjacent the coupling cavity and a heat sink disposed on the structural member such that heat generated by the at least one LED is dissipated.

28. The luminaire of claim 1 , wherein said light source is at least one LED and further comprising a structural member disposed adjacent the coupling cavity and a driver circuit disposed on the structural member to supply power to the at least one LED.

29. A luminaire, comprising:
a first and a second waveguide, each of the first and second waveguides having a first end and a second end, wherein the first waveguide comprises a first coupling surface extending between a first surface and a second surface opposite the first surface, wherein the second waveguide comprises a second coupling surface extending between a third surface and a fourth surface opposite the third surface, and wherein the first and second coupling surfaces define a coupling cavity extending between the first end and the second end and the coupling cavity separating the first waveguide and the second waveguide;
at least one LED within the coupling cavity;
a structural member disposed adjacent the coupling cavity and at least one of a heat sink and a driver circuit disposed on the structural member; and
wherein the first waveguide comprises a first body comprising a first lateral extent defined by the first and second surfaces, wherein the second waveguide comprises a second body comprising a second lateral extent defined by the third and fourth surfaces, wherein at least one of the first and second waveguides comprises a curved portion adjacent the coupling cavity, and wherein the curved portion extends to a planar portion distal to the coupling cavity.

Assignees

• Cree Inc

Inventors

• Tarsa Eric J
• Benjamin Hormoz
• Durkee John W
• Keller Bernd P

Classifications

• G02B6/0085

  Means for removing heat created by the light source from the package · CPC title

• F21W2131/103

  of streets or roads · CPC title

• G02B6/0078 Primary

  Side-by-side arrangements, e.g. for large area displays · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V29/763

  the planes containing the fins or blades having the direction of the light emitting axis · CPC title