LED LAMP WITH A HEAT SINK

• US 20090129102A1
• Filed: 11/21/2007
• Published: 05/21/2009
• Est. Priority Date: 11/21/2007
• 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: LIU, YI-SAN, HE, LI, XIAO, XU-HUA
• Granted Patent: US 7,637,635 B2
• Time in Patent Office: Days
• US Class Current: 362/373
• 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: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of 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 2115/10 Light-emitting diodes [LED]

Abstract

An LED lamp includes a heat sink and an LED module. The heat sink includes a body, a plurality of radial partition fins extending evenly from an outer periphery of the body and a curved wall surrounding lower portions of the fins. The fins, the outer periphery of the body and the wall together define a plurality of channels each having a lower opening and a top opening. The LED module includes a plurality of LEDs and is received in the absorbing portion of the body. The LED module is supported by the absorbing portion of the body of the heat sink. Heat generated by the LEDs is transferred to the fins via the body. From the fins, the heat is dissipated to air. The channels each function as a chimney for accelerating heated air to flow upwardly through the fins.

Claims

1. An LED lamp comprising:

a heat sink comprising a body having an absorbing portion and a transferring portion extending upwardly from the absorbing portion, a plurality of radial partition fins extending evenly from an outer periphery of the absorbing portion and the transferring portion of the body, a curved wall surrounding lower portions of the fins, the fins, the outer periphery of the body and the wall together defining a plurality of channels each having a lower opening and a top opening; and

an LED module comprising a plurality of LEDs, being received in the absorbing portion of the body, the LED module being attached to the absorbing portion and having a thermal connection therewith.

2. The LED lamp as described in claim 1, wherein the fins each have a convex outer surface, whereby the heat sink has a bowl-shaped configuration.

3. The LED lamp as described in claim 2, wherein the fins each have a flat top face coplanar with a top face of the transferring portion and a bottom face coplanar with a bottom face of the absorbing portion.

4. The LED lamp as described in claim 3, wherein the wall connects a lower portion of the outer surface of each of the fins.

5. The LED lamp as described in claim 4, wherein the wall has a bottom edge coplanar with bottom edges of the fins, the lower openings of the heat sink being defined by the fins, the body and the bottom edge of the wall.

6. The LED lamp as described in claim 4, wherein the wall has a top edge in middle portions of the fins, the top openings of the channels of the heat sink being defined by the fins, the body and the top edge of the wall.

7. The LED lamp as described in claim 1, wherein the absorbing portion and the transferring portion each have a cylindrical configuration and have a common axis.

8. The LED lamp as described in claim 7, wherein a diameter of the transferring portion is smaller than that of the absorbing portion.

9. The LED lamp as described in claim 8, wherein the transferring portion extends a mounting portion upwardly from an upper portion thereof, a diameter of the mounting portion being smaller than that of the transferring portion.

10. The LED lamp as described in claim 7, wherein the absorbing portion defines a cylindrical cavity in a bottom thereof to form a ceiling in the cavity, the LED module being mounted on the ceiling.

11. The LED lamp as described in claim 1, wherein the wall has a configuration of a hollow frustum.

12. A heat sink for removing heat from an LED module having LEDs, the heat sink comprising:

a body receiving the LED module;

a plurality of radial partition fins extending evenly from an outer periphery of the body, the fins each having a convex outer surface; and

a curved wall surrounding and connecting a lower portion of the convex outer surface of each of the fins, the fins, the outer periphery of the body and the wall together defining a plurality of channels each having a lower opening and a top opening;

wherein air flows from the lower opening to the top opening for removing heat from the heat sink when the heat sink absorbs the heat from the LED module.

13. The heat sink as described in claim 12, wherein the heat sink has a bowl-shaped configuration.

14. The heat sink as described in claim 12, wherein the wall has a top edge located at a middle portion of the outer surface of each of the fins.

15. An LED lamp comprising:

a heat sink having a central body defining a lower recess, a plurality of fins extending outwardly from a periphery of the central body wherein every two neighboring fins defines a gap therebetween, and a wall enclosing lower portions of the fins whereby a plurality of channels is defined between the lower portions of the fins, the wall and a lower portion of the periphery of the central body, each channel occupying a lower portion of a corresponding gap; and

an LED module having a printed circuit board and a plurality of LEDs mounted to the printed circuit board, wherein the printed circuit board is received in the recess of the central body and thermally connects with the central body.