Side-emitting optical coupling device

• US 9,287,474 B2
• Filed: 08/27/2013
• Issued: 03/15/2016
• Est. Priority Date: 10/12/2004
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Keller, Bernd, Jacobson, Benjamin, Gengelbach, Robert
• Primary Examiner(s): Rodela, Eduardo A
• Application Number:
  US14/010,828
• Publication Number:
  US 20130342096A1
• Time in Patent Office: 931 Days
• Field of Search: 257/88, 257/98, 257/E33.067, 257/E33.071, 257/E33.072, 362/606, 362/607, 362/608, 362/609, 362/610, 362/612, 362/613, 362/615, 362/623, 362/559, 362/560, 362/241, 362/247, 362/249.02, 362/297, 362/300, 362/302, 362/304, 362/305, 362/311.09, 362/350
• US Class Current: 1/1
• 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: F21K 9/61 using light guides
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00
• CPC Class Codes: G02B 19/0071 adapted to illuminate a complete hemisphere or a plane extending 360 degrees around the source
• CPC Class Codes: G02B 6/4214 the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device G02B6/4246 takes precedence
• CPC Class Codes: H01L 33/483 Containers
• CPC Class Codes: H01L 33/52 Encapsulations
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

An LED package includes a LED structure that outputs light in a pattern about an axis and an optical coupling device with a central axis. The coupling device is positioned relative to the LED structure and accepts light from the LED. The coupling device includes a first dielectric interface surface that is substantially cylindrical with respect to the central axis, and a reflecting surface. The first dielectric interface surface accepts a first portion of light from the LED structure and directs it toward the reflecting surface. The reflecting surface accepts the light from the first dielectric interface surface and directs it toward the first dielectric interface surface in a direction substantially perpendicular to the central axis.

Claims

1. A light emitting system comprising:

one or more emitters on a base;

at least one reflector proximate to said emitters and comprising a central axis; and

at least one light guide;

wherein said light guide is configured to accept at least a portion of light from said emitters;

wherein said reflector comprises a plurality of faces on either side of said central axis;

wherein said base comprises a perimeter support surrounding said emitters.

2. The light emitting system of claim 1, wherein said reflector is configured to reflect light from said emitters in a pattern substantially coplanar with said light guide;

and

wherein said light guide is configured to accept said reflected light.

3. The light emitting system of claim 1, wherein said reflector is configured to reflect light in a radial pattern.

4. The light emitting system of claim 3, wherein said light guide comprises a first surface substantially parallel to a primary emission axis of said emitters;

and

wherein said first surface is configured to accept at least about 180 degrees of said radially reflected light.

5. The light emitting system of claim 4, wherein said first surface is configured to accept substantially all of said radially reflected light.

6. The light emitting system of claim 1, wherein said reflector is configured to reflect light in a full circle of directions substantially coplanar with said light guide.

7. The light emitting system of claim 1, wherein said at least one light guide at least partially surrounds said emitters.

8. The light emitting system of claim 1, wherein said emitters are in the center of said light guide.

9. The light emitting system of claim 1, wherein said light guide is disk-shaped.

10. The light emitting system of claim 1, wherein said at least one light guide comprises first and second light guides;

wherein said reflector is configured to reflect a first portion of light from said emitters in a radial pattern substantially coplanar with said first and second light guides; and

wherein each of said first and second light guides is configured to accept about half of said first portion of light.

11. The light emitting system of claim 1, wherein an emitter package comprises said reflector and at least one of said emitters, said emitter package configured to emit light in a direction substantially perpendicular to a primary emission axis of said emitters.

12. The light emitting system of claim 1, wherein said portion of light is refracted and reflected throughout said light guide.

13. The light emitting system of claim 1, wherein said portion of light propagates within said light guide via total internal reflection.

14. A light emitting system, comprising:

an emitter package comprising;

an emitter on a base to emit light about a primary emission axis;

a body around said emitter to accept light from said emitter; and

a metallic reflective layer on a top surface of said body; and

a light guide at least partially surrounding said emitter package;

wherein said light guide is configured to accept at least a portion of the light emitted by said emitter package;

wherein said base comprises a perimeter support surrounding said emitter.

15. The light emitting system of claim 14, wherein said emitter package emits light in a direction substantially perpendicular to said primary emission axis.

16. The light emitting system of claim 14, wherein said light guide comprises a first surface approximately parallel to said primary chip emission axis;

wherein said first surface is configured to accept light emitted from said emitter package.

17. The light emitting system of claim 16, wherein said first surface is configured to accept substantially all light emitted from said emitter package.

18. The light emitting system of claim 14, wherein said light guide substantially fully surrounds said emitter package.

19. The light emitting system of claim 14, wherein said light guide is substantially disk-shaped.

20. The light emitting system of claim 14, wherein said light guide is substantially planar.

21. The light emitting system of claim 14, wherein said light guide comprises a tapering surface.

22. The light emitting system of claim 14, wherein said light guide comprises a concave or convex surface.

23. The light emitting system of claim 14, wherein said light guide is panel shaped.

24. The light emitting system of claim 14, wherein said light guide comprises a curved surface.

25. The light emitting system of claim 14, wherein an emission surface of said light guide comprises surface roughness.

26. The light emitting system of claim 14, wherein said light guide comprises a sawtooth refractive portion.

27. The light emitting system of claim 14, wherein said light guide comprises a lens.

28. The light emitting system of claim 14, wherein said light guide comprises a Fresnel lens.

29. The light emitting system of claim 14, wherein said portion of light is refracted and reflected throughout the entire light guide.

30. The light emitting system of claim 14, wherein said portion of light propagates within said light guide via total internal reflection.

31. The light emitting system of claim 14, wherein said metallic reflective layer is deposited on said top surface.

32. The light emitting system of claim 14, wherein said metallic reflective layer is on a second body that is adjacent to said body such that said metallic reflective layer is between said body top surface and said second body.