LED lamp with a cover and a heat sink

• US 7,488,093 B1
• Filed: 04/23/2008
• Issued: 02/10/2009
• Est. Priority Date: 12/27/2007
• Status: Expired due to Fees

• Current Assignee: Foxconn Technology Co., Ltd., Fuzhun Precision Industry Company Limited (Foxconn Technology Co., Ltd.)
• Original Assignee: Foxconn Technology Co., Ltd., Fuzhun Precision Industry Company Limited (Foxconn Technology Co., Ltd.)
• Inventors: Yu, Ye-Fei, Kuo, Jer-Haur, Zha, Xin-Xiang, Huang, Chung-Yuan
• Primary Examiner(s): Sember, Thomas M
• Application Number:
  US12/107,779
• Time in Patent Office: 293 Days
• Field of Search: 362/294, 362/373, 362/431
• US Class Current: 362/294
• 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: F21S 8/086 with lighting device attached sideways of the standard, e.g. for roads and highways
• CPC Class Codes: F21V 15/00 Protecting lighting devices from damage protection from thermal damage F21V29/00; gas-tight or water-tight arrangements F21V31/00
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/713 in direct thermal and mechanical contact of each other to form a single system
• CPC Class Codes: F21V 29/717 using split or remote units thermally interconnected, e.g. by thermally conductive bars or heat pipes
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED lamp (100) includes a frame (12), at least one LED module (20), a heat sink (32) and a cover (50). The LED module has a plurality of LEDs (220). The heat sink is mounted on the frame. The at least one LED module is attached to a bottom of the heat sink, whereby heat generated by the LEDs can be dissipated by the heat sink. A heat pipe (35) interconnects the heat sink and the cover. Thus, the heat generated by the LEDs can also be dissipated by the cover via the heat pipe. The cover is secured so as to shield a top portion of the heat sink and space from the top portion of the heat sink.

Claims

1. An LED lamp comprising:

a frame;

at least one LED module having a plurality of LEDs;

a heat sink on which the at least one LED module is attached, the heat sink being mounted on the frame;

at least a heat pipe; and

a cover;

wherein

two ends of the at least a heat pipe are respectively connected to the heat sink and the cover, the cover shields a top portion of the heat sink and spaces from the top portion of the heat sink.

2. The LED lamp as claimed in claim 1, wherein the cover has an arch shape, the cover has an outer surface having a protruding shape and an internal surface having a concave shape, the outer surface has a smooth surface, the internal surface faces towards the top portion of the heat sink.

3. The LED lamp as claimed in claim 1, wherein the at least a heat pipe has a number of three, and the cover is secured by the three heat pipes.

4. The LED lamp as claimed in claim 3, wherein the heat pipes respectively locate at three points of a triangle.

5. The LED lamp as claimed in claim 1, wherein the at least a heat pipe has a horizontal evaporator, a vertical connection and a horizontal condenser, the evaporator and the condenser respectively connect with two ends of the connection.

6. The LED lamp as claimed in claim 5, wherein a length of the connection of the at least a heat pipe is longer than a vertical length of the heat sink.

7. The LED lamp as claimed in claim 5, wherein the heat sink comprises a base and a plurality of fins extending from a top portion of the base, the evaporator of the at least a heat pipe is attached to the base, the connection extends through the base and the fins vertically.

8. The LED lamp as claimed in claim 5, wherein an internal surface of the cover defines an elongate groove correspondingly for receiving the condenser of the at least a heat pipe.

9. The LED lamp as claimed in claim 8 further comprising a board which is used to attach the condenser of the at least a heat pipe to the cover by one of soldering and fastening.

10. A street lamp comprising:

a lamp post; and

an LED lamp connecting to the lamp post and comprising;

a plurality of LEDs for generating light;

a heat sink on which the LEDs are attached;

a plurality of heat pipes; and

a cover;

wherein

two ends of each of the heat pipes are respectively connected to the heat sink and the cover so as to make the cover shield a top portion of the heat sink and the cover is spaced from the top portion of the heat sink.

11. The street lamp as claimed in claim 10, wherein the cover has an arch shape, the cover has an outer surface having a protruding shape and an internal surface having a concave shape, the outer surface has a smooth surface, the internal surface is oriented towards the top portion of the heat sink.

12. The street lamp as claimed in claim 11, wherein top ends of the heat pipes are attached to the internal surface of the cover and secured to the internal surface of the cover by a plurality of boards, respectively.

13. The street lamp as claimed in claim 11, wherein the heat sink has a plurality of fins formed on the top portion thereof.

14. The street lamp as claimed in claim 10, wherein the heat pipes have a number of three, and the three heat pipes are respectively locate at three points of a triangle, the cover is supported by the three heat pipes.

15. The street lamp as claimed in claim 10, wherein a length of each of the heat pipes is longer than a vertical length of the heat sink.

16. The street lamp as claimed in claim 10, wherein the heat sink comprises a plurality of fins, and the heat pipes extend upwardly from the fins.