Light Emitting Module Especially For Use in an Optical Projection Apparatus, and Optical Projection Apparatus

• US 20090129079A1
• Filed: 08/31/2006
• Published: 05/21/2009
• Est. Priority Date: 08/31/2005
• Status: Active Grant

• Current Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Kudaev, Sergey, Schreiber, Peter, Moffat, Bryce Anton, Grotsch, Stefan
• Granted Patent: US 7,976,205 B2
• Time in Patent Office: Days
• US Class Current: 362/235
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: G02B 17/08 Catadioptric systems used in non-imaging applications G02B19/00
• 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 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H04N 9/315 Modulator illumination systems general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20

Abstract

A light-emitting module is specified, comprising at least two light sources disposed on a common carrier. At least one of said light sources includes at least two LED chips. Each light source (1) of the module is followed downstream by an optic body of an optical element, and the optic bodies are suitable for guiding electromagnetic radiation to a light exit surface of the optical element. An optical projection apparatus comprising such a light-emitting module is also specified.

Claims

1. A light-emitting module, comprising at least two light sources disposed on a common carrier, wherein

at least one of said light sources includes at least two LED chips,

each said light source is followed downstream by an optic body of an optical element, and

said optic bodies are suitable for guiding electromagnetic radiation to a light exit surface of said optical element.

2. The light-emitting module as in claim 1,

wherein at least one of said optic bodies includes a non-imaging optical concentrator.

3. The light-emitting module as in claim 1,

wherein at least one of said optic bodies includes a truncated-pyramid optic.

4. The light-emitting module as in claim 1,

wherein at least one of said optic bodies includes an asymmetrical truncated-pyramid optic.

5. The light-emitting module as in claim 1,

wherein at least one of said optic bodies is configured as a solid body.

6. The light-emitting module as in claim 1,

wherein said optical element is configured in more than one piece.

7. The light-emitting module as in claim 1,

wherein said optical element is one-piece.

8. The light-emitting module as in claim 1,

wherein said light exit surface of said optical element is formed by a convex surface that extends over the light exit surfaces of said optic bodies.

9. The light-emitting module as in claim 1,

wherein said light exit surface of said optical element has convex subregions that are interconnected by concave subregions.

10. The light-emitting module as in claim 1,

wherein said light exit surface of said optical element comprises convex subregions that are interconnected by planar surfaces.

11. The light-emitting module as in claim 1,

wherein said light exit surface of said optical element is composed of the light exit surfaces of said optic bodies.

12. The light-emitting module as in claim 1,

wherein a light entrance surface of at least one of said optic bodies has an anti-reflection coating comprising a dielectric material.

13. The light-emitting module as in claim 1,

wherein said light entrance surface of at least one of said optic bodies has a periodic microstructure suitable for reducing the reflection of electromagnetic radiation.

14. The light-emitting module as in claim 1,

wherein said light exit surface of said optical element has an anti-reflection coating comprising a dielectric material.

15. The light-emitting module as in claim 1,

wherein said light exit surface of said optical element has a periodic microstructure suitable for reducing the reflection of electromagnetic radiation.

16. The light-emitting module as in claim 1,

wherein at least one said LED chip is unencapsulated.

17. The light-emitting module as in claim 1,

wherein a gap containing air is disposed between a light outcoupling surface of at least one said LED chip and a said light entrance surface of a said optic body.

18. The light-emitting module as in claim 1,

wherein the distance between said light outcoupling surface of said at least one LED chip and said light entrance surface of a said optic body is no more than 250 μ

m.

19. The light-emitting module as in claim 1,

comprising a holder to which said optic bodies are attached.

20. The light-emitting module as in claim 19,

wherein said optic bodies are integrally connected to said holder.

21. The light-emitting module as in claim 19,

wherein said holder surrounds said optic bodies on at least four sides.

22. The light-emitting module as in claim 19,

wherein said holder surrounds said light sources on at least four sides.

23. An optical projection apparatus comprising a light-emitting module according to claim 1 and a projection optic that is disposed downstream of said light-emitting module.