LED LAMP WITH A HEAT DISSIPATION DEVICE

• US 20090040776A1
• Filed: 08/09/2007
• Published: 02/12/2009
• Est. Priority Date: 08/09/2007
• Status: Active Grant

• 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: HE, LI, YU, GUANG, ZHANG, WEN-XIANG
• Granted Patent: US 7,674,016 B2
• Time in Patent Office: Days
• US Class Current: 362/373
• CPC Class Codes: F21K 9/275 Details of bases or housings, i.e. the parts between the light-generating element and the end caps; Arrangement of components within bases or housings F21K9/278 takes precedence
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• 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 29/777 the planes containing the fins or blades having directions perpendicular to the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• 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 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An LED lamp includes a heat sink (10) and a plurality of LED modules (20) mounted on a periphery of the heat sink. The heat sink defines a through hole (122) from a lateral side to an opposite lateral side thereof to define a cylindrical inner face. A plurality of fins (16) are attached to the heat sink in a manner such that the fins have spaced external portions (160) extending outwardly from the periphery of the heat sink, and opposite internal portions (162) extending inwardly from the inner face of the heat sink. The internal portions connect with each other to form a joint (164) in the through hole, thus increasing a heat dissipating area of the heat sink and reinforcing the heat sink.

Claims

1. An LED lamp comprising:

a hollow prism-shaped heat sink with a through hole defined therein from a lateral side to an opposite lateral side thereof;

a plurality of LED modules mounted on a periphery of the heat sink; and

a plurality of fins attached to the heat sink, the fins having external portions outside the heat sink, and internal portions in the though hole of the heat sink in a manner such that at least two fins have the external portions thereof spaced from each other, and the internal portions thereof connecting with each other, thus increasing a heat dissipating area of the heat sink and reinforcing the heat sink.

2. The LED lamp of claim 1, wherein the heat sink comprises a plurality of outer sidewalls with the LED modules mounted on corresponding outer sidewalls along a lengthwise direction of the heat sink.

3. The LED lamp of claim 2, wherein the external portions of the at least two fins extend outwardly from junctions of corresponding adjacent sidewalls, respectively, with at least one of the LED modules located between the at least two fins.

4. The LED lamp of claim 1, wherein the heat sink has a cylindrical inner face to enclose the through hole of the heat sink.

5. The LED lamp of claim 4, wherein the internal portions of the at least two fins extend inwardly from the inner face of the heat sink opposing to corresponding external portions of the at least two fins.

6. The LED lamp of claim 5, wherein extremities of the internal portions of the least two fins connect with each other to form a joint at a centre of the through hole of the heat sink.

7. The LED lamp of claim 6, wherein a plurality of channels is defined between adjacent internal portions of the fins and the inner face of the heat sink for providing passages of airflow.

8. The LED lamp of claim 7, wherein the channels are spaced from each other and distributed evenly with respective to the joint of the fins.

9. The LED lamp of claim 1, wherein the fins extend along the lengthwise direction of the heat sink from the lateral side to the opposite lateral side of the heat sink and have inward increasing thicknesses.

10. The LED lamp of claim 1, wherein a pair of annular connections project outwardly from the two opposite lateral sides of the heat sink in such a manner that each of the pair of annular connections has an interior diameter essentially identical to that of the heat sink, and an exterior diameter less than that of the heat sink.

11. A heat dissipation device for dissipating heat generated by LED modules, comprising:

a hollow prism-shaped heat sink with a through hole define therein from a lateral side to an opposite lateral side thereof, the heat sink comprising a plurality of outer sidewalls adapted for mounting the LED modules thereon, and an inner face enclosing the through hole of the heat sink; and

a plurality of fins attached to the heat sink, at least two fins having external portions extending outwardly from the sidewalls of the heat sink, and internal portions extending inwardly from the inner face of the heat sink, wherein the external portions of the at least two fins are spaced from each other, and the internal portions of the heat sink connect with each other to from a joint in the through hole of the heat sink, thus reinforcing the heat sink.

12. The heat dissipation device of claim 11, wherein the external portions of the at least two fins are located at junctions of corresponding sidewalls of the heat sink.

13. The heat dissipation device of claim 11, wherein the internal portions of the fins divide the through hole of the heat sink into a plurality of channels, each of the channels is located between two adjacent fins and a corresponding sidewall of the heat sink.

14. The heat dissipation device of claim 13, wherein extremities of the internal portions of the at least two fins connect with each other at a centre of the heat sink for allowing the channels and the fins to be distributed evenly with respective to the joint.

15. The heat dissipation device of claim 11, wherein the fins extend from the lateral side to the opposite lateral side of the heat sink in a manner such that the fins have outward descending thicknesses.

16. The heat dissipation device of claim 11, wherein a pair of annular connections are formed outwardly from the two opposite lateral sides of the heat sink and opposing to each other, and the through hole extends through the pair of annular connections.

17. An LED lamp comprising:

a heat sink having a tubular wall, a plurality of first fins extending from a center of the tubular wall to an inner periphery of the tubular wall and a plurality of second fins extending outwardly from an outer periphery of the tubular wall; and

a plurality of LED modules each having a printed circuit board and a plurality of LEDs mounted on the printed circuit board;

wherein each of the LED modules is mounted on the outer periphery of the tubular wall and between two neighboring second fins.