Lighting device with optimized decoupling surface

• US 20050218790A1
• Filed: 12/22/2004
• Published: 10/06/2005
• Est. Priority Date: 12/30/2003
• Status: Active Grant

• Current Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Blumel, Simon
• Granted Patent: US 8,174,036 B2
• Time in Patent Office: Days
• US Class Current: 313/498
• CPC Class Codes: G02B 19/0014 at least one surface having optical power
• 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 27/0955 Lenses lenses per se G02B3/00
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

The invention relates to a lighting device comprising a light source (1) that emits incoherent light with a total radiation power P and has a radiation-emitting area (S) divided into a plurality of subareas (S_i), wherein assigned to each subarea (S_i) is a light ray (2) having a radiation power P_i and the sum of the radiation powers P_i is equal to the total radiation power P, and disposed after said light source (1) is an optical element (4) having a decoupling surface (5) and a total reflection angle (θ_c) assigned to said decoupling surface (5), said decoupling surface (5) being shaped so that at least for a portion of said light rays (2) the angle (α) of incidence on said decoupling surface (5) is smaller than the total reflection angle (θ_c), and the radiation power of said light rays collectively is greater than a predetermined fraction, equal to at least 50%, of the total radiation power P.

Claims

1. A lighting device comprising a light source that emits incoherent light with a total radiation power P and has a radiation-emitting area (S) divided into a plurality of subareas (S_i),

wherein assigned to each subarea (S_i) is a light ray having a radiation power P_i, and the sum of the radiation powers P_i is equal to the total radiation power P, and disposed after said light source is an optical element having a decoupling surface and a total reflection angle (θ

_c) assigned to said decoupling surface, said decoupling surface being shaped so that at least for a portion of the light rays, the angle (α

) of incidence on said decoupling surface is smaller than said total reflection angle (θ

_c), and the radiation power of said light rays collectively is greater than a predetermined fraction q of said total radiation power P.

4. The lighting device as set forth in claim 1,

wherein said predetermined fraction q is at least 50%.

5. The lighting device as set forth in one of claim 1,

wherein said light source is a semiconductor body.

6. The lighting device as set forth in one of claim 1,

wherein said light source emits visible light.

7. The lighting device as set forth in one of claim 1,

wherein said light source is at least partially surrounded by said optical element.

8. The lighting device as set forth in claim 7,

wherein said optical element is formed from an enveloping material for said light source.

9. The lighting device as set forth in claim 8,

wherein said enveloping material is a synthetic material.

10. The lighting device as set forth in claim 9,

wherein said enveloping material is a reactive resin.

11. The lighting device as set forth in one of claims 1,

wherein a reflector is provided for the light emitted by said light source.

12. The lighting device as set forth in claim 11,

wherein said reflector comprises a metal or is provided with a metallized surface.

13. The lighting device as set forth in claim 12,

wherein said reflector comprises a duroplast.

14. The lighting device as set forth in claim 12,

wherein said reflector comprises a thermoplast.

15. The lighting device as set forth in claim 12,

wherein said reflector comprises a ceramic.

16. The lighting device as set forth in one of claims 11,

wherein said reflector has a coating to increase the reflection of the light emitted by said light source.

17. The lighting device as set forth in one of claims 1,

wherein said reflector has a CPC structure.

2. A lighting device comprising a light source that emits incoherent light with a total radiation power P and has a radiation-emitting area (S) divided into a plurality of subareas (S_i),

wherein assigned to each subarea (S_i) is a light ray bundle comprising a plurality of light rays of radiation power P_ij,

and the sum of said radiation powers P_ij is equal to said total radiation power P, and disposed after said light source is an optical element having a decoupling surface and a total reflection angle (θ

_c) assigned to said decoupling surface, said decoupling surface being shaped so that at least for a portion of said light rays the angle (α

) of incidence on said decoupling surface is smaller than said total reflection angle (θ

_c), and the radiation power of said light rays collectively is greater than a predetermined fraction q of said total radiation power P.

3. The lighting device as set forth in claim 2,

wherein a respective radiation characteristic is assigned to each of said subareas (S_i)

and the distribution of the respective radiation powers P_ij to said subareas (S_i) corresponds in each case to the appurtenant radiation characteristic.

18. The lighting device as set forth in claim 2,

wherein said predetermined fraction q is at least 50%.

19. The lighting device as set forth in one of claim 2,

wherein said light source is a semiconductor body.

20. The lighting device as set forth in one of claim 2,

wherein said light source emits visible light.

21. The lighting device as set forth in one of claims 2,

wherein said light source is at least partially surrounded by said optical element.

22. The lighting device as set forth in claim 21,

wherein said optical element is formed from an enveloping material for said light source.

23. The lighting device as set forth in claim 22,

wherein said enveloping material is a synthetic material.

24. The lighting device as set forth in claim 23,

wherein said enveloping material is a reactive resin.

25. The lighting device as set forth in one of claims 2,

wherein a reflector is provided for the light emitted by said light source.

26. The lighting device as set forth in claim 25,

wherein said reflector comprises a metal or is provided with a metallized surface.

27. The lighting device as set forth in claim 26,

wherein said reflector comprises a duroplast.

28. The lighting device as set forth in claim 26,

wherein said reflector comprises a thermoplast.

29. The lighting device as set forth in claim 26,

wherein said reflector comprises a ceramic.

30. The lighting device as set forth in one of claims 25

wherein said reflector has a coating to increase the reflection of the light emitted by said light source.

31. The lighting device as set forth in one of claims 2,

wherein said reflector has a CPC structure.