Spot TIR lens system for small high-power emitter

• US 8,858,022 B2
• Filed: 05/03/2012
• Issued: 10/14/2014
• Est. Priority Date: 05/05/2011
• Status: Active Grant

• Current Assignee: Ledengin, Inc. (Ams-Osram AG)
• Original Assignee: Ledengin, Inc. (Ams-Osram AG)
• Inventors: Jiang, Wu, Yan, Xiantao, Adebiyi, Debo A.
• Primary Examiner(s): BRUCE, DAVID VERNON
• Application Number:
  US13/463,735
• Publication Number:
  US 20130120985A1
• Time in Patent Office: 894 Days
• Field of Search: 362/235, 362/244, 362/249.02, 362/327
• US Class Current: 362/235
• CPC Class Codes: B29D 11/00009 Production of simple or compound lenses
• 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 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• 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 19/0066 in the form of an LED array

Abstract

A lamp includes a single emitter structure having a substrate with 25 or more light emitting diodes (LEDs) arranged thereon and a power rating of 80 Watts or more, a total internal reflection (TIR) lens with a plurality of refractive surface regions disposed on the step-shaped upper surface of the optical body, and a holder having a plurality of tabs disposed along an inside rim of the holder and configured for radial compression fit with a flange of the lens, and three or more support members configured for centering the optical body member with respect to the single emitter structure. A low weight ratio of hardener over base resin below 6 is used, for example, between 1.5:1 to 2.5:1.

Claims

1. A lamp, comprising:

a single emitter structure having a substrate with 25 or more light-emitting diodes (LEDs) arranged thereon and a power rating of 80 Watts or more;

a total-internal-reflection (TIR) lens, the lens including;

an optical body member having a substantially straight interior open channel in a lower portion thereof, the interior open channel having a lower opening for accommodating the single emitter structure;

the optical body member having a step-shaped upper surface defining an increasingly wider cavity extending from an interior portion to an upper opening in of the optical body; and

a plurality of refractive surface regions disposed on the step-shaped upper surface of the optical body; and

a holder having a concave interior surface shaped to accommodate the optical body member and a convex exterior surface, the holder having a first opening disposed to surround the lower opening of the optical body member and a second opening opposite the first opening, wherein the optical body member is insertable into the holder through the second opening, the holder further including;

a plurality of tabs disposed along an inside rim of the holder and configured for radial compression fit with a flange of the lens;

a finger-width sized cut-out; and

three or more support members disposed surrounding the first opening of the holder and configured for centering the optical body member with respect to the single emitter structure.

2. The lamp of claim 1, wherein the lens comprises a mixture of hardener over base resin, with a weight ratio of hardener over base resin less than 6.

3. The lamp of claim 2, wherein the base resin is PMMA and a weight ratio of the hardener over base resin of about 4.1 to 2.1.

4. The lamp of claim 2, wherein the base resin is epoxy and a weight ratio of the hardener over base resin of about 4.1 to 2.1.

5. The lamp of claim 2, wherein the base resin is silicone and a weight ratio of the hardener over base resin of about 4.1 to 2.1.

6. The lamp of claim 1, wherein the lamp is configured to provide uniform color light at three meters or farther.

7. The lamp of claim 1, wherein the lamp is configured to provide FWHW (full width half max) of 15 degrees, with 80% optical efficiency, wherein the optical efficiency is defined as the ratio of the light output through the secondary TIR lens to the light output of the emitter.

8. The lamp of claim 1, wherein the lamp is characterized by a diameter of 80 mm and a height of 50 mm.

9. A method for forming the lamp of claim 1, comprising forming the lens by molding a mixture of hardener over base resin, with a weight ratio of hardener over base resin less than 6:

1.

10. The method of claim 9, wherein the base resin is PMMA and a weight ratio of the hardener over base resin of about 4.1 to 2.1.

11. The method of claim 9, wherein the base resin is epoxy or silicone and a weight ratio of the hardener over base resin of about 4.1 to 2.1.

12. A lamp, comprising:

a single emitter structure having a substrate with a plurality light-emitting diodes (LEDs) arranged thereon;

a total-internal-reflection (TIR) lens, the lens including;

an optical body member having a substantially straight interior open channel in a lower portion thereof, the interior open channel having a lower opening for accommodating the single emitter structure;

the optical body member having an upper surface defining an increasingly wider cavity extending from an interior portion to an upper opening in of the optical body; and

a plurality of refractive surface regions disposed on the upper surface of the optical body; and

a holder having a concave interior surface shaped to accommodate the optical body member and a convex exterior surface, the holder having a first opening disposed to surround the lower opening of the optical body member and a second opening opposite the first opening, wherein the optical body member is insertable into the holder through the second opening, the holder further including;

a plurality of tabs disposed along an inside rim of the holder and configured for radial compression fit with a flange of the lens; and

three or more support members disposed surrounding the first opening of the holder and configured for centering the optical body member with respect to the single emitter structure.

13. The lamp of claim 12, wherein the upper surface of the optical body member comprises a plurality of steps.

14. The lamp of claim 13, further comprising a plurality of refractive surface regions disposed on upper surface of the optical body.

15. The lamp of claim 12, wherein the lens comprises a mixture of hardener over base resin, with a weight ratio of hardener over base resin 4.1 to 2.1.

16. The lamp of claim 12, wherein the lens comprises a mixture of hardener over base resin, with a weight ratio of hardener over base resin between 1.5:

1 to 2.5;

1.

17. A method for forming the lamp of claim 12, comprising forming the lens by molding a mixture of hardener over base resin, with a weight ratio of hardener over base resin less than 6:

1.

18. The method of claim 17, wherein the lens comprises a mixture of hardener over base resin, with a weight ratio of hardener over base resin between 1.1:

1 to 2.5;

1.

19. A lamp, comprising:

a single emitter structure having a substrate with 25 or more light-emitting diodes (LEDs) arranged thereon and a power rating of 80 Watts or more;

a total-internal-reflection (TIR) lens, the lens including a plurality of refractive surface regions disposed on a step-shaped upper surface of an optical body; and

a holder having a plurality of tabs disposed along an inside rim of the holder and configured for radial compression fit with a flange of the lens, and three or more support members configured for centering the optical body member with respect to the single emitter structure.

20. The lamp of claim 19, wherein the lens comprises a mixture of hardener over base resin, with a weight ratio of hardener over base resin less than 6.

21. The lamp of claim 19, wherein the lens comprises a mixture of hardener over base resin, with a weight ratio of hardener over base resin between 1.5:

1 to 2.5;

1.

22. A lens assembly, comprising:

a total-internal-reflection (TIR) lens, the lens including;

an optical body member having a substantially straight interior open channel in a lower portion thereof, the interior open channel having a lower opening for accommodating a light source;

the optical body member having a step-shaped upper surface defining an increasingly wider cavity extending from an interior portion to an upper opening in of the optical body; and

a plurality of refractive surface regions disposed on the step-shaped upper surface of the optical body; and

a holder having a concave interior surface shaped to accommodate the optical body member and a convex exterior surface, the holder having a first opening disposed to surround the lower opening of the optical body member and a second opening opposite the first opening, wherein the optical body member is insertable into the holder through the second opening, the holder further including;

a plurality of tabs disposed along an inside rim of the holder and configured for radial compression fit with a flange of the lens;

a finger-width sized cut-out; and

three or more support members disposed surrounding the first opening of the holder and configured for centering the optical body member with respect to the light source.

23. The lens assembly of claim 22, wherein the lens comprises a mixture of hardener over base resin, with a weight ratio of hardener over base resin less than 6.

24. The lens assembly of claim 23, wherein the base resin is PMMA and a weight ratio of the hardener over base resin of about 4.1 to 2.1.

25. The lens assembly of claim 23, wherein the base resin is epoxy or silicone and a weight ratio of the hardener over base resin of about 4.1 to 2.1.