High power LED electro-optic assembly

• US 7,540,634 B2
• Filed: 05/13/2005
• Issued: 06/02/2009
• Est. Priority Date: 06/15/2004
• Status: Active Grant

• Current Assignee: Chemtron Research LLC (Intellectual Ventures LLC)
• Original Assignee: Henkel Corporation (Henkel AG & Co KGaA)
• Inventors: Belek, Ronald E.
• Primary Examiner(s): Truong; Bao Q
• Application Number:
  US11/629,591
• Publication Number:
  US 20080273329A1
• Time in Patent Office: 1,481 Days
• Field of Search: 362/294, 362/800, 362/547, 362/545, 362/362, 362/373, 257/98, 257/712, 257717-722
• US Class Current: 362/294
• CPC Class Codes: B29C 65/4835 Heat curing adhesives
• CPC Class Codes: B29C 65/4845 Radiation curing adhesives, e.g. UV light curing adhesives
• CPC Class Codes: B29C 65/4855 characterised by their physical properties, e.g. being electrically-conductive
• CPC Class Codes: B29C 65/54 between pre-assembled parts
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/5344 said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends B29C66/5346 takes precedence
• CPC Class Codes: B29C 66/61 Joining from or joining on the inside for making tubes by bending sheets and joining from the inside B29C53/387
• CPC Class Codes: F21V 29/505 of reflectors
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 5/041 Ball lenses
• 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: H01L 2224/45124 Aluminium (Al) as principal constituent
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• 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 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/58 : Optical field-shaping elements
• CPC Class Codes: H01L 33/60 : Reflective elements
• CPC Class Codes: H01L 33/62 : Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H01L 33/647 : the elements conducting electric current to or from the semiconductor body
• CPC Class Codes: H01L 33/648 : the elements comprising fluids, e.g. heat-pipes
• CPC Class Codes: Y10S 362/80 : Light emitting diode

Abstract

The present invention provides a high power LED electro-optic assembly (40) including conductive heat sink (18) and an LED (14) mounted at one end of the heat sink. The LED (14) is in electrical engagement with the heat sink (18). The assembly (40) also includes a reflector (2) mounted at the other end of the heat sink. An insulating bond material (19) is provided between the reflector and the sink. The assembly (40) further includes a conductive bonding pin (15) extending through the reflector (12) and is in conductive engagement therewith and an electrical engagement (16) which electrically engages the pin (15) to the LED (14). Finally, an electric sleeve assembly (30) where the sleeve (32) is coated with an electrical insulating coating (34) is applied to the LED electro-optic assembly.

Claims

1. A LED electro-optic assembly comprising:

at least one LED;

a conductive heat sink having mounted at one end thereof, said LED in electrical engagement therewith;

a conductive reflector mounted to said one end of said heat sink and surrounding said LED;

an insulative member electrically isolating said conductive reflector from said heat sink;

a conductive bonding pin extending through said conductive reflector and in conductive engagement therewith; and

an electrical engagement engaging said bonding pin with said LED;

wherein said heat sink and said reflector form an electrically conductive location for supplying power to said LED.

2. The assembly of claim 1 wherein said heat sink includes a planar surface at said one end and wherein said LED is mounted to said surface.

3. The assembly of claim 2 wherein said reflector is an elliptical reflector having a central opening therethrough and wherein said LED is mounted in said central opening.

4. The assembly of claim 3 wherein said insulative member includes a bonding agent for securing said conductive reflector to said heat sink.

5. The assembly of claim 1 wherein said heat sink is a heat pipe.

6. The assembly of claim 1 wherein said bonding pin is gold plated.

7. The assembly of claim 1 wherein said wire bond is a wire jumper interconnecting said bonding pin to said LED.

8. The assembly of claim 1 further including:

an optic lens member positioned adjacent to said optical reflector, said optic lens member being spaced from said LED for focusing light rays emanating from said LED.

9. The assembly of claim 7 wherein said optic lens member is supported at least partially within said optic reflector.

10. The assembly of claim 7 wherein said optic lens member is a ball optic for production of enhanced light power density.

11. The assembly of claim 7 wherein said optic lens member is a half ball optic for production of collimate light.

12. The assembly of claim 7 further including a conductive retaining sleeve supporting said heat sink, said reflector and said optic lens member.

13. The assembly of claim 12 wherein said conductive sleeve is placed in electrical continuity with said conductive reflector.

14. The assembly of claim 13 wherein said conductive sleeve is insulatively separated from said heat pipe.

15. The assembly of claim 13 wherein said conductive sleeve is insulatively separated from said heat pipe by an insulative adhesive which secures said sleeve to said heat pipe.

16. The assembly of claim 13 wherein said conductive sleeve is insulatively coated.

17. The assembly of claim 15 wherein said sleeve includes at least one passage therethrough adjacent said conductive reflector.

18. The assembly of claim 17 wherein said passage is filled with a conductive adhesive to establish conductive engagement between said sleeve and said reflector.

19. The assembly of claim 17 which said passage is electrically engaged with said sleeve and said reflector.

20. A LED electro-optic electrical sleeve assembly comprising:

a generally cylindrical sleeve coated with an electrical insulator, having an upper portion and a lower portion, said upper and lower portion separated by an insulative member;

at least one LED and a conductive reflector having mounted at said upper portion, wherein said reflector surrounds said LED;

a conductive heat sink having mounted at said lower portion, said LED in electrical engagement therewith;

a conductive bonding pin extending through said conductive reflector and in conductive engagement therewith; and

an electrical engagement engaging said bonding pin to said LED;

wherein said heat sink and said reflector form an electrically conductive location for supplying power to said LED.

21. The assembly of claim 20 further comprising a pair of slots located at an upper portion.

22. The assembly of claim 21 wherein said slots are coated with a conductive adhesive to bond said sleeve to the reflector.

23. The assembly of claim 21 wherein said reflector is bonded to said sleeve via an aluminum wire.

24. The assembly of claim 20 wherein said reflector is bonded to the heat sink by said insulative member.

25. The assembly of claim 20 further comprising an optic lens member positioned adjacent to said reflector, said optic lens member being spaced and positioned from said LED for focusing light rays emanating from said LED.

26. The assembly of claim 25 wherein said upper portion retains said optic lens member.

27. The assembly of claim 25 wherein said optic lens member is supported at least partially within the reflector.

28. The assembly of claim 25 wherein said optic lens member is positioned completely outside said reflector.