LED lamp

• US 9,523,488 B2
• Filed: 09/24/2010
• Issued: 12/20/2016
• Est. Priority Date: 09/24/2010
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Le, Long Larry, Progl, Curt
• Primary Examiner(s): BANNAN, JULIE A
• Application Number:
  US12/889,719
• Publication Number:
  US 20120075833A1
• Time in Patent Office: 2,279 Days
• Field of Search: 362/373, 362/294, 362/264, 362/249.01, 362/249.02
• US Class Current: 1/1
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 29/15 Thermal insulation
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A thermal isolation arrangement for an LED lamp is disclosed. Embodiments of the invention provide thermal isolation between the power supply and the LED assembly of an LED lamp, in most cases allowing the power supply to operate in a lower temperature range than would otherwise be possible. At least one contact feature is provided between the power supply and the LED assembly to maintain a thermal transfer gap between the power supply and the LED assembly. A contact feature can be, for example, a triangular ridge or a conical protrusion. In some embodiments, a thermal isolation device provides the contact feature or contact features. An LED lamp according to example embodiments of the invention can have a modular design and/or can include an Edison base and/or an optical element or optical elements disposed to emit light from the LED lamp.

Claims

1. An LED lamp comprising:

an LED assembly including a first plurality of slots;

a power supply portion electrically connected to the LED assembly, the power supply portion including a first plurality of tabs; and

a thermal isolation device further comprising;

a first face including a second plurality of tabs that engages the first plurality of slots with the first face proximate to the LED assembly;

a second face proximate to the power supply portion;

a second plurality of slots to engage the first plurality of tabs; and

wherein contact features are arranged on the first face and the second face of the thermal isolation device to maintain one thermal transfer gap between the power supply portion and the second face of the thermal isolation device and another thermal transfer gap between the LED assembly and the first face of the thermal isolation device wherein the thermal transfer gap between the power supply portion and the second face measures from 0.1 mm to 5 mm.

2. The LED lamp of claim 1 wherein at least some of the contact features comprise a triangular ridge.

3. The LED lamp of claim 2 wherein at least some of the contact features comprise a plurality of triangular ridges distributed on at least one face of the thermal isolation device.

4. The LED lamp of claim 2 further comprising an Edison base connected to the power supply.

5. The LED lamp of claim 4 further comprising an optical element disposed to emit light from the LED lamp.

6. The LED lamp of claim 1 wherein at least some of the contact features comprise a conical protrusion.

7. The LED lamp of claim 6 wherein at least some of the contact features comprise a plurality of conical protrusions distributed on at least one face of the thermal isolation device.

8. The LED lamp of claim 1 further comprising an Edison base connected to the power supply.

9. The LED lamp of claim 8 further comprising an optical element disposed to emit light from the LED lamp.

10. The LED lamp of claim 9 further comprising an additional optical element that has been treated with phosphor.

11. A method of producing an LED lamp, the method comprising:

assembling a power supply portion of the LED lamp and an LED assembly portion of the LED lamp, the LED assembly portion including a first plurality of slots, and the power supply portion including a first plurality of tabs;

providing a thermal isolation device having a radius from about 15 mm to about 20 mm comprising at least two contact features on a first face of the thermal isolation device and at least two contact features on a second face of the thermal isolation device disposed to maintain two thermal transfer gaps, one thermal transfer gap between the LED assembly portion and the first face of the thermal isolation device and another thermal transfer gap between the power supply portion and the second face of the thermal isolation device, wherein the thermal isolation device also includes a second plurality of slots in the thermal isolation device and second plurality of tabs on the first face of the thermal isolation device; and

interconnecting the power supply portion, the thermal isolation device and the LED assembly portion by engaging the second plurality of tabs with the first plurality of slots and the second plurality of slots with the first plurality of tabs so that the two thermal transfer gaps are maintained.

12. The method of claim 11 further comprising installing an optical element proximate to the LED assembly portion to emit light from the LED lamp.

13. The method of claim 12 wherein at least some of the contact features comprise a plurality of triangular ridges distributed on the thermal isolation device.

14. The method of claim 13 wherein the power supply portion comprises an Edison base.

15. The method of claim 12 wherein at least some of the contact features comprise a plurality of conical protrusions distributed on the thermal isolation device.

16. The method of claim 15 wherein the power supply portion comprises an Edison base.

17. A modular LED lamp comprising:

an LED assembly module including one of a first plurality of slots and a first plurality of tabs;

a power supply module including the other of the first plurality of slots and the first plurality of tabs; and

a thermal isolation device disposed to maintain one thermal isolation gap between the LED assembly module and a first face of the thermal isolation device and another thermal isolation gap between a second face of the thermal isolation device and the power supply module, wherein the thermal isolation device further includes a second plurality of tabs that engages the first plurality of slots and a second plurality of slots that engages the first plurality of tabs.

18. The modular LED lamp of claim 17 further comprising a heat sink disposed to cool an LED assembly.

19. The modular LED lamp of claim 18 further comprising at least a first optical element disposed to emit light from the LED lamp.

20. The modular LED lamp of claim 19 further comprising a second optical element.

21. The modular LED lamp of claim 20 wherein at least one of the first and second optical elements is treated with phosphor.

22. The modular LED lamp of claim 17 further comprising contact features arranged on the first face and the second face of the thermal isolation device.

23. The modular LED lamp of claim 22 wherein at least some of the contact features comprise a triangular ridge.

24. The modular LED lamp of claim 23 wherein at least some of the contact features comprise a plurality of triangular ridges distributed on at least one face of the thermal isolation device.

25. The modular LED lamp of claim 22 wherein at least some of the contact features comprise a conical protrusion.

26. The modular LED lamp of claim 25 wherein at least some of the contact features comprise a plurality of conical protrusions distributed on at least one face of the thermal isolation device.