LED lamp having double-side heat sink

• US 7,744,247 B2
• Filed: 12/27/2007
• Issued: 06/29/2010
• 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: Lai, Cheng-Tien, Zhang, Wen-Xiang, Yu, Guang, Xiao, Xu-Hua
• Primary Examiner(s): Negron; Ismael
• Application Number:
  US11/964,847
• Publication Number:
  US 20090168416A1
• Time in Patent Office: 915 Days
• Field of Search: 362/97.3, 362/249.02, 362/294, 362/218, 362/373, 362/244
• US Class Current: 362/249.02
• CPC Class Codes: F21S 8/086 with lighting device attached sideways of the standard, e.g. for roads and highways
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED lamp includes a heat sink having a base and a plurality of fins extending from the base. A plurality of LED modules is thermally attached to the base of the heat sink. A lamp frame surrounds the LED modules on the heat sink and is hermetically mounted to the heat sink. A lens is hermetically attached to the lamp frame and covers the LED modules. The fins includes a plurality of first fins extending from a first face of the base of the heat sink, and second fins extending from a second face of the base. The LED modules are located between the second fins. A pole has a top end engages with the lamp frame. The pole is used for mounting the LED lamp at a desired position, for example, a sidewalk of a street.

Claims

1. An LED lamp comprising:

a heat sink comprising a base and a plurality of fins extending from the base;

a plurality of LED modules thermally attached to the base of the heat sink;

a lamp frame surrounding the LED modules on the heat sink;

a lens attached to the lamp frame and covering the LED modules;

a reflecting board on the LED modules, wherein the LED modules each comprise a printed circuit board thermally contacting the base of the heat sink, and a plurality of LEDs mounted on the printed circuit board, the reflecting board defines a plurality of holes receiving corresponding LEDs therein; and

a gasket sandwiched between the base of the heat sink and the lamp frame.

2. The LED lamp of claim 1 further comprising a gasket sandwiched between the lens and the lamp frame.

3. The LED lamp of claim 1, wherein the lamp frame comprises a frame body located on the heat sink and a cavity body extending beyond the heat sink, the cavity body having a printed circuit board located therein.

4. The LED lamp of claim 3, wherein the cavity body has a bridge formed in a central portion thereof, an engaging hole being defined under the bridge for engagingly receiving a pole when the LED lamp is in use.

5. The LED lamp of claim 1 further comprising a lid secured to the lamp frame and fastening the lens to the lamp frame.

6. The LED lamp of claim 5 further comprising a ring pad sandwiched between the lid and the lens.

7. The LED lamp of claim 1, wherein the base of the heat sink has a first face and a second face opposite to the first face, the fins extending from the first face, the LED modules being attached to the second face.

8. The LED lamp of claim 7, wherein the fins of the heat sink have heights thereof increasing from two opposite sides to a center of the base.

9. The LED lamp of claim 7, wherein the heat sink further comprises a plurality of second fins extending from the second face of the base thereof, the LED modules being located between the second fins.

10. The LED lamp of claim 9, wherein the second fins of the heat sink extend from two opposite side portions of the second face of the base.

11. The LED lamp of claim 10, wherein the second fins of the heat sink has heights thereof increasing from corresponding side portions of the second face of the base toward a center of the base.

12. An LED lamp comprising:

a heat sink having a base with opposite first and second faces, a plurality of first fins extending from the first face of the base, a plurality of second fins extending from two opposite sides of the second face;

a plurality of LED modules mounted on the second face of the base of the heat sink between the second fins;

a lamp frame hermetically secured to the heat sink, having a frame body enclosing the LED modules and a cavity body extending from the frame body to a position beside the heat sink;

at least a printed circuit board received in the cavity body;

a lens hermetically mounted on the frame body and covering the LED modules;

a holding lid secured to the frame body to sandwich the lens between the holding lid and the frame body; and

a pole having a top end engaging with the cavity body, adapted for mounting the LED lamp on a desired position.

13. The LED lamp of claim 12 further comprising a reflecting board on the LED modules, wherein the LED modules each comprises a printed circuit board thermally contacting the base of the heat sink, and a plurality of LEDs mounted on the printed circuit board, the reflecting board defines a plurality of holes receiving corresponding LEDs therein.

14. An LED lamp comprising:

a heat sink comprising a base and a plurality of fins extending from the base;

a plurality of LED modules thermally attached to the base of the heat sink;

a lamp frame surrounding the LED modules on the heat sink;

a lens attached to the lamp frame and covering the LED modules;

a lid secured to the lamp frame and fastening the lens to the lamp frame; and

a ring pad sandwiched between the lid and the lens.

15. The LED lamp of claim 14, wherein the lamp frame comprises a frame body located on the heat sink and a cavity body extending beyond the heat sink, the cavity body having a printed circuit board located therein.

16. The LED lamp of claim 15, wherein the cavity body has a bridge formed in a central portion thereof, an engaging hole being defined under the bridge for engagingly receiving a pole when the LED lamp is in use.

17. The LED lamp of claim 14, wherein the base of the heat sink has a first face and a second face opposite to the first face, the fins extending from the first face, the LED modules being attached to the second face.

18. The LED lamp of claim 17, wherein the fins of the heat sink have heights thereof increasing from two opposite sides to a center of the base.

19. The LED lamp of claim 17, wherein the heat sink further comprises a plurality of second fins extending from the second face of the base thereof, the LED modules being located between the second fins.

20. The LED lamp of claim 19, wherein the second fins of the heat sink extend from two opposite side portions of the second face of the base.