LED lamp with a flexible heat sink

• US 9,243,796 B1
• Filed: 07/22/2015
• Issued: 01/26/2016
• Est. Priority Date: 07/22/2015
• Status: Active Grant

• Current Assignee: Putco Incorporated
• Original Assignee: Putco Incorporated
• Inventors: Elwell, James P., Quick, Trent
• Primary Examiner(s): Hanley, Britt D
• Application Number:
  US14/805,602
• Time in Patent Office: 188 Days
• Field of Search: None
• 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: F21S 41/151 arranged in one or more lines
• CPC Class Codes: F21S 41/19 Attachment of light sources or lamp holders achieving variable light distribution by movable light sources F21S41/657
• CPC Class Codes: F21S 41/192 Details of lamp holders, terminals or connectors
• CPC Class Codes: F21S 45/48 with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
• CPC Class Codes: F21S 45/49 Attachment of the cooling means
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED lamp uses a flexible metal fabric as a heat sink. At least one light emitting diode is attached to a circuit board that is mounted on a heat conducting member. The flexible heat sink is attached to the heat conducting member, such that heat generated by the light emitting diode and circuit board is conducted to the flexible heat sink. The flexible heat sink can be deformed to fit in a variety of spaces. The flexible heat sink dissipates the heat generated by the LED lamp without the need for a fan. The flexible heat sink may be made from braided copper fabric.

Claims

1. An LED lamp with a heat sink, the lamp comprising:

a wire harness adapted for connection to an electrical system;

a first circuit board electrically connected to the wire harness;

a second circuit board electrically connected to the wire harness;

a heat conducting member, wherein the circuit boards are mounted on opposite sides of the heat conducting member;

a first light emitting diode on the first circuit board;

a second light emitting diode on the second circuit board;

a flexible heat sink mechanically connected to the heat conducting member; and

wherein the flexible heat sink comprises a flexible metal fabric.

2. The LED lamp of claim 1, wherein the flexible metal fabric comprises a braided metal band.

3. The LED lamp of claim 2, wherein the braided metal band is folded into first and second loops.

4. The LED lamp of claim 2, wherein the flexible heat sink comprises a first and a second braided metal band, and wherein the first and second braided metal bands are crimped to the heat conducting member with the heat conducting member sandwiched between the braided metal bands.

5. The LED lamp of claim 2, wherein the braided metal band comprises copper strands.

6. The LED lamp of claim 2, wherein the braided metal band comprises tinned copper strands.

7. The LED lamp of claim 1, wherein the heat conducting member comprises a copper bar.

8. The LED lamp of claim 7, wherein the circuit boards are mounted on the heat conducting member by a heat conducting adhesive.

9. The LED lamp of claim 1, wherein the circuit boards are mounted to the heat conducting member with the light emitting diodes proximate to a first end of the heat conducting member and further wherein the flexible heat sink is connected at a second end of the heat conducting member opposite from the first end of the heat conducting member.

10. The LED lamp of claim 1, wherein the light emitting diodes produce at least 1100 lumens.

11. The LED lamp of claim 10, wherein the LED lamp is free from fans.

12. The LED lamp of claim 1, further comprising a mounting base, wherein the circuit boards and the heat conducting member are enclosed within the mounting base, wherein the mounting base has openings to accommodate the light emitting diodes, and wherein the flexible heat sink extends outwardly out of the mounting base.

13. The LED lamp of claim 12, wherein the wire harness is adapted for connection to an automobile electrical system.

14. The LED lamp of claim 1, wherein the mounting base is adapted to mount within an automobile headlight fixture.

15. A method of installing an LED lamp into a light fixture comprising:

providing an LED lamp that has a light emitting diode on a circuit board, a heat conducting member supporting the circuit board, a flexible heat sink made from a flexible metal fabric attached to the heat conducting member, and a mounting body enclosing the circuit board and heat conducting member;

shaping the flexible heat sink into a desired shape to fit in a space behind the light fixture; and

installing the mounting body in the light fixture with the light emitting diode on a front side of the fixture and the flexible heat sink in the space behind the light fixture.

16. The method of claim 15, wherein the flexible metal fabric is formed with a plurality of loops and wherein the shaping step comprises expanding the loops.

17. The method of claim 16, wherein the flexible metal fabric comprises braided copper.