Lamp structure with remote LED light source

• US 9,068,701 B2
• Filed: 01/26/2012
• Issued: 06/30/2015
• Est. Priority Date: 01/26/2012
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Progl, Curt
• Primary Examiner(s): Hines, Anne
• Assistant Examiner(s): DIAZ, JOSE
• Application Number:
  US13/358,901
• Publication Number:
  US 20130194796A1
• Time in Patent Office: 1,251 Days
• Field of Search: 362/480, 362/546, 362/547, 362/218, 362/294, 362/555, 362/249.01, 362/249.02, 362/367, 362373-375, 362/368, 362/240, 362/362, 362/363, 362/311.02, 362/221, 362/97.3, 362/646, 362/84, 362/307, 313/20, 313 45- 46, 313/317, 313/113, 313/110, 257/81, 439/487
• US Class Current: 1/1
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/77 with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/777 the planes containing the fins or blades having directions perpendicular to the light emitting axis
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21Y 2107/40 on the sides of polyhedrons, e.g. cubes or pyramids
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

LED based lamps and bulbs are disclosed that comprise an elevating element to arrange LEDs above the lamp or bulb base. The elevating element can at least partially comprise a thermally conductive material. A heat sink structure is included, with the elevating element thermally coupled to the heat sink structure. A diffuser can be arranged in relation to the LEDs so that at least some light from the LEDs passes through the diffuser and is dispersed into the desired emission pattern. In some lamps and bulbs utilize a heat pipe for the elevating elements, with heat from the LEDs conducting through the heat pipe to the heat sink structure where it can dissipate in the ambient.

Claims

1. A solid state lamp, comprising:

a solid state light source;

a lamp base at least partially comprising a heat conductive material and heat fins, wherein said lamp base comprises a power supply unit;

an elongated elevating element mounted to said lamp base with said light source mounted to said elevating element such that said light source is above said lamp base, said elevating element being at least partially heat conductive, wherein said light source is mounted to a first end of said elevating element with a second end of said elevating element mounted to said lamp base;

a conductive block mounted to and in thermal contact with said elevating element, said light source mounted to said conductive block, wherein said conductive block comprises a plurality of planar surfaces for said light source; and

a diffuser to diffuse light emitting from said lamp into a desired emission pattern, such that said diffuser is proximate to said elongated elevating element and a substantial portion of both said elongated elevating element and said diffuser are above said lamp base, said heat fins, and said heat conductive material;

wherein a portion of each of said heat fins is within the bottom of said diffuser.

2. The lamp of claim 1, wherein said solid state light source comprises a plurality of light emitting diodes (LEDs).

3. The lamp of claim 1, wherein said solid state light source comprises a plurality of LEDs, each of which is emitting in a different direction.

4. The lamp of claim 1, wherein said elevating element comprises a heat pipe.

5. The lamp of claim 1, wherein said light source comprises one or more LEDs.

6. The lamp of claim 1, wherein said light source is in thermal contact with said elevating element, and said elevating element is in thermal contact with said lamp base.

7. The lamp of claim 1, comprising a thermally conductive path from said light source, through said elevating element, to said lamp base and to the ambient.

8. The lamp of claim 1, wherein said emission pattern is omnidirectional.

9. The lamp of claim 1, wherein said lamp base comprises a heat sink.

10. The lamp of claim 1, wherein said lamp base comprises an electrical connector.

11. The lamp of claim 1, wherein said diffuser comprises a diffuser dome.

12. The lamp of claim 1, wherein said solid state light source comprises a plurality of LEDs, with at least some of said LEDs mounted on different surfaces of said conductive block.

13. The lamp of claim 1, wherein said light source comprises two LEDs, each of which is mounted on a respective surface of said conductive block.

14. The lamp of claim 1, wherein said light source comprises four LEDs, each of which is mounted on a respective surface of said conductive block.

15. The lamp of claim 1, wherein said light source comprises five LEDs, each of which is mounted on a respective surface of said conductive block.

16. The lamp of claim 1, wherein said conductive block has four or more planar surfaces.

17. The lamp of claim 1, wherein said solid state light source comprises a plurality of LEDs, with at least some of said LEDs mounted on opposite sides of said conductive block.

18. The lamp of claim 1, wherein said emission pattern comprises intensity variation of approximately +20 percent or less.

19. The lamp of claim 1, wherein said emission pattern comprises an intensity variation of approximately +15 percent or less.

20. The lamp of claim 1, wherein said elongating element comprises more than one heat pipe.

21. The lamp of claim 20, wherein said light source comprises a plurality of LEDs, wherein each said heat pipe has at least one of said LEDs.

22. The lamp of claim 21, wherein the emission of each said LED is directed toward said diffuser.

23. A light emitting diode (LED) based bulb, comprising:

a heat pipe;

a plurality of LEDs, each of which is mounted at or near a first end of, and in thermal contact with, said heat pipe, said heat pipe comprising a thermally conductive path to conduct heat away from said LEDs;

a conductive block mounted to and in thermal contact with said heat pipe, said LEDs mounted to said conductive block; and

a lamp base at least partially comprising a heat conductive material and a plurality of heat fins, the second end of said heat pipe mounted to, and in thermal contact with, said lamp base, said lamp base comprising a thermally conductive path to conduct heat away from said heat pipe, wherein said lamp base comprises a power supply unit;

a diffuser to diffuse light emitting from said bulb, wherein a portion of at least some of said heat fins is within the bottom of said diffuser.

24. The bulb of claim 23, wherein heat from said lamp base dissipates to the ambient.

25. The bulb of claim 23, said diffuser in relation to said LEDs so that light from said LEDs passes through said diffuser.

26. The bulb of claim 25, wherein said diffuser modifies the emission pattern of said LEDs into an omnidirectional pattern.

27. The bulb of claim 25, wherein said diffuser comprises a diffuser dome.

28. The bulb of claim 27, wherein said diffuser is at least partially over said LEDs, and wherein said LEDs approximate a point light source within said diffuser dome.

29. The bulb of claim 23, wherein said lamp base comprises a heat sink structure.

30. The bulb of claim 29, wherein said thermally conductive path to conduct heat away from said heat pipe is through said heat sink structure.

31. The bulb of claim 29, wherein said heat sink further comprises heat fins.

32. The bulb of claim 23, having an omnidirectional emission pattern with intensity variation of approximately +20 percent or less.

33. The bulb of claim 23, having an omnidirectional emission pattern with intensity variation of approximately +15 percent or less.

34. The bulb of claim 23, wherein said conductive block comprises a plurality of planar surfaces, each of said LEDs mounted to one of said planar surfaces.

35. The bulb of claim 23, further comprising a screw-threaded portion for mounting said bulb to an Edison socket.

36. The bulb of claim 23, comprising an A-bulb replacement.

37. A solid state lamp, comprising:

a plurality of heat pipes, each of said heat pipes having a plurality of solid state light sources, in thermal contact with said heat pipe, a conductive block mounted to and in thermal contact with said heat pipe, said light sources mounted to said conductive block, wherein at least two of said light sources are facing different directions;

a heat sink structure, said heat pipe thermally coupled to said heat sink structure with heat from said solid state light sources conducting to said heat sink structure through said heat pipe, said heat sink structure including power circuitry; and

a diffuser with at least some light from said light sources passing through said diffuser.

38. The lamp of claim 37, wherein said diffuser disperses light from said light sources into an omnidirectional pattern.

39. The lamp of claim 37, wherein said light sources approximate a point light source within said diffuser.