Method and device for providing circumferential illumination

• US 20090001397A1
• Filed: 05/29/2008
• Published: 01/01/2009
• Est. Priority Date: 05/29/2007
• Status: Abandoned Application

• Current Assignee: Oree, Advanced Illumination Solutions Inc.
• Original Assignee: Oree, Advanced Illumination Solutions Inc.
• Inventors: Meir, Noam, Fine, Eran
• Application Number:
  US12/155,090
• Publication Number:
  US 20090001397A1
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: G02B 6/0018 Redirecting means on the surface of the light guide
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/003 Lens or lenticular sheet or layer
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0041 provided in the bulk of the light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0058 varying in density, size, shape or depth along the light guide
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]

Abstract

A light source device, comprising at least one light emitting element, an optical for distributing light emitted by the light emitting element(s) into a waveguide material which is in optical communication with the optical funnel, and at least one reflector contacting the waveguide material for redirecting light back into the waveguide material such as to reduce illumination exiting the waveguide material in any direction other than a circumferential direction.

Claims

1. A light source device, comprising:

at least one light emitting element;

an optical funnel being constituted for distributing light emitted by said at least one light emitting element into a waveguide material which is in optical communication with said optical funnel; and

at least one reflector contacting said waveguide material for redirecting light back into said waveguide material such as to reduce illumination exiting said waveguide material in any direction other than a circumferential direction.

3. Illumination apparatus, comprising at least one light source device as claimed in claim 1, and a light distribution device being configured for distributing illumination provided by said at least one light source device.

5. The apparatus of claim 3, wherein said light distribution device is an integral extension of said at least one light source device.

7. The device of claim 1, wherein at least one of said waveguide and said optical funnel is incorporated with particles capable of scattering said light.

8. The device of claim 1, wherein an illumination profile provided by the device is characterized in that at least 80% illumination is distributed within a colatitude range of from about 45°

to about 135°

.

9. The device of claim 1, wherein said optical funnel is an optical resonator being designed and constructed such that circumferential illumination provided by the device is substantially white.

10. The device of claim 1, wherein said optical funnel is an optical resonator being designed and constructed such that circumferential illumination provided by the device has a substantially uniform brightness.

11. The device of claim 1, wherein said optical funnel is adjacent to said waveguide material and being external thereto.

12. The device of claim 1, wherein said optical funnel is embedded in said waveguide material.

13. The device of claim 12, wherein said optical funnel protrudes out of a surface of said waveguide material.

14. The device of claim 12, wherein said optical funnel is flash with an external surface of said waveguide material said waveguide material.

15. The device of claim 1, wherein the device further comprising at least one optical element for deflecting said light upon entry to said optical funnel.

16. The device of claim 1, wherein said at least one reflector comprises a planar reflector.

17. The device of claim 1, wherein said at least one reflector comprises a non-planar reflector.

18. The device of claim 1, wherein said at least one reflector comprises a specular mirror.

19. The device of claim 1, wherein said at least one reflector comprises a Lambertian reflector.

20. The device of claim 1, wherein said at least one reflector comprises a diffusive reflector.

21. The device of claim 1, wherein said at least one reflector comprises a curved part and a generally planar part being peripheral to said curved part, said curved part being positioned opposite to a location of said at least one light emitting element.

22. The device of claim 1, wherein said at least one light emitting element is a light emitting diode.

23. The device of claim 22, wherein said light emitting diode is embedded within said waveguide.

24. The device of claim 22, wherein said light emitting diode is a bare die.

25. The device of claim 1, wherein said waveguide material comprises at least one photoluminescent layer.

26. The device of claim 25, wherein said at least one photoluminescent layer and said at least one light emitting element are selected such that a substantially white light exits said at least one photoluminescent layer.

27. The device of claim 1, wherein at least one of said waveguide and said optical funnel is incorporated with particles having photoluminescent properties.

2. A light source device, comprising:

at least one light emitting element;

a waveguide material for distributing light emitted by said at least one light emitting element; and

at least one reflector contacting said waveguide material for redirecting light back into said waveguide material such as to reduce illumination exiting said waveguide material in any direction other than a circumferential direction;

wherein a surface area of said reflector is at least two times the surface area of said at least one light emitting element and an optical efficiency of the light source device is at least 60%.

4. Illumination apparatus, comprising at least one light source device as claimed in claim 2, and a light distribution device being configured for distributing illumination provided by said at least one light source device.

6. Illumination apparatus, comprising:

at least one light emitting element;

a waveguide material for distributing light emitted by said at least one light emitting element; and

at least one reflector contacting at least one surface of said waveguide material for redirecting light back into said waveguide material;

said waveguide material extending beyond said at least one reflector and being configured for distributing illumination through an extended portion of said at least one surface.