LED lamp

• US 20060001384A1
• Filed: 10/12/2004
• Published: 01/05/2006
• Est. Priority Date: 06/30/2004
• Status: Active Grant

• Current Assignee: Transpacific IP Group Limited
• Original Assignee: Industrial Technology Research Institute
• Inventors: Ho, Tzong-Che, Tain, Ra-Min, Liau, Shyi-Ching
• Granted Patent: US 7,314,291 B2
• Time in Patent Office: Days
• US Class Current: 315/246
• 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: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/67 characterised by the arrangement of fans
• CPC Class Codes: F21V 29/677 the fans being used for discharging
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21Y 2107/30 on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
• 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: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

An LED lamp includes bare LED chips, an axle, and a lampshade. The bare LED chips are mounted on surface of the axle. The axle extends across the lampshade. A heat pipe is installed inside the axle for transferring the heat generated by the LED chips to exterior of the lampshade and obtaining a better heat dissipation.

Claims

1. An LED lamp, comprising:

a lampshade, having a concave surface, a central hole and an opening;

said central hole is formed on said lampshade;

an axle, passing through said central hole into said lampshade;

a heat dissipating element, mounted on said axle, extending across both sides of said lampshade and being defined with a heat receiving portion and a heat dissipating portion;

a plurality of LED chips, mounted on surface of said axle and corresponding to said heat receiving portion of said heat dissipating element; and

a driving circuit, embedded in said axle, for driving said LED chips;

whereby, heat generated by said LED chips is transferred by said heat dissipating element from said heat receiving portion to said heat dissipating portion and dissipated by at least one of natural convection and cooling fan.

2. The LED lamp according to claim 1 wherein surface of said LED chips are covered with a transparent material for preventing said LED chips from reaction with air.

3. The LED lamp according to claim 2 wherein said transparent material is chosen from one of epoxy and silicone.

4. The LED lamp according to claim 1 further comprises a transparent plate mounted on said opening of said lampshade for preventing foreign objects entering said lampshade.

5. The LED lamp according to claim 4 wherein a space enclosed by said transparent plate and said lampshade is filled with a transparent material for preventing said LED chips from reaction with air.

6. The LED lamp according to claim 5 wherein said transparent material is chosen from one of nitrogen and inert gas.

7. The LED lamp according to claim 5 wherein said transparent material is chosen from one of epoxy and silicone.

8. The LED lamp according to claim 4 wherein a space enclosed by said transparent plate and said lampshade is vacuumed for preventing said LED chips from reaction with air.

9. The LED lamp according to claim 1 wherein said axle is made of an electrically insulation material.

10. The LED lamp according to claim 1 wherein said axle is composed of a printed circuit board.

11. The LED lamp according to claim 10 wherein said driving circuit is stacked in said printed circuit board.

12. The LED lamp according to claim 10 wherein said driving circuit is printed on surface of said printed circuit board.

13. The LED lamp according to claim 1 further comprises a printed circuit board covering a surface of said axle.

14. The LED lamp according to claim 1 wherein said LED chips are bare chips.

15. The LED lamp according to claim 1 wherein said LED chips emit light of different colors or the same color.

16. The LED lamp according to claim 1 wherein said LED chips are electrically connected with said driving circuit through a method is selected from one of embedding and wire bonding.

17. The LED lamp according to claim 1 wherein said heat dissipating element is at least a heat pipe.

18. The LED lamp according to claim 1 wherein said heat dissipating element is composed of at least a thermally conductive rod.

19. The LED lamp according to claim 20 wherein each thermally conductive rod is formed with at least a conduit for being filled with a fluid for heat transfer.

20. The LED lamp according to claim 1 further comprises at least a radiation fin mounted on said heat dissipating portion of said axle.

21. An LED lamp, comprising:

a lampshade, having a concave surface, a central hole and an opening;

said central hole is formed on said lampshade;

an axle, composed of a plurality of heat pipes, passing through said central hole into said lampshade, extending across both sides of said lampshade and being defined with a heat receiving portion and a heat dissipating portion;

a plurality of LED chips, mounted on surface of said heat receiving portion of said heat pipes; and

a driving circuit, embedded in surface of said heat pipes, for driving said LED chips;

whereby, heat generated by said LED chips are transferred by said heat pipes from said heat receiving portion to said heat dissipating portion and dissipated by at least one of natural convection and cooling fan.

22. The LED lamp according to claim 21 wherein surface of said LED chips are covered with a transparent material for preventing said LED chips from reaction with air.

23. The LED lamp according to claim 22 wherein said transparent material is chosen from one of epoxy and silicone.

24. The LED lamp according to claim 21 further comprises a transparent plate mounted on said opening of said lampshade for preventing foreign objects entering said lampshade.

25. The LED lamp according to claim 24 wherein a space enclosed by said transparent plate and said lampshade is filled with a transparent material for preventing said LED chips from reaction with air.

26. The LED lamp according to claim 25 wherein said transparent material is chosen from one of nitrogen and inert gas.

27. The LED lamp according to claim 25 wherein said transparent material is chosen from one of epoxy and silicone.

28. The LED lamp according to claim 24 wherein a space enclosed by said transparent plate and said lampshade is vacuumed for preventing said LED chips from reaction with air.

29. The LED lamp according to claim 21 wherein an end of said axle is covered with an end plate for mounting LED chips.

30. The LED lamp according to claim 21 wherein each heat pipe has a trapezoid section for forming said axle with a polygon section.

31. The LED lamp according to claim 21 wherein each exterior surface of said heat pipe is covered by a printed circuit board.

32. The LED lamp according to claim 31 wherein said driving circuit is stacked in said printed circuit board.

33. The LED lamp according to claim 31 wherein said driving circuit is printed on surface of said printed circuit board.

34. The LED lamp according to claim 21 further comprises an electrically insulation layer covering exterior surface of said heat pipes.

35. The LED lamp according to claim 21 wherein said LED chips are bare chips.

36. The LED lamp according to claim 21 wherein said LED chips emit light of different colors or the same color.

37. The LED lamp according to claim 21 wherein said LED chips are electrically connected with said driving circuit through a method is selected from one of embedding and wire bonding.

38. The LED lamp according to claim 21 wherein said axle is further composed of a rod for enhancing stiffness.

39. The LED lamp according to claim 21 further comprises at least a radiation fin mounted on said heat dissipating portion of said axle.