LED illumination device and light engine thereof

• US 7,926,982 B2
• Filed: 04/14/2009
• Issued: 04/19/2011
• Est. Priority Date: 07/04/2008
• Status: Expired due to Fees

• Current Assignee: Foxconn Technology Co., Ltd.
• Original Assignee: Foxconn Technology Co., Ltd.
• Inventors: Liu, Tay-Jian
• Primary Examiner(s): Alavi; Ali
• Application Number:
  US12/423,020
• Publication Number:
  US 20100002433A1
• Time in Patent Office: 735 Days
• Field of Search: 362/294, 362/373, 362/218, 362/249.02
• US Class Current: 362/294
• CPC Class Codes: F21S 4/20 with light sources held by or within elongate supports
• CPC Class Codes: F21V 19/001 the light sources being semiconductors devices, e.g. LEDs
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/745 the fins or blades being planar and inclined with respect to the joining surface from which the fins or blades extend
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

An LED illumination device includes a lampshade and a light engine arranged on the lampshade. The lampshade defines a room therein. The light engine includes a heat dissipation member, and a plurality of LEDs arranged on the heat dissipation member and received in the room of the lampshade. The heat dissipation member includes a heat pipe and a heat sink. The heat pipe forms a planar absorbing surface and a dissipating surface opposite to the absorbing surface. The absorbing surface of the heat pipe attaches to the LEDs to absorb heat therefrom. The heat sink includes a base attaching to the dissipating surface of the heat pipe to absorb heat of the heat pipe, and a plurality of fins extending from the base for dissipating heat absorbed from the heat pipe.

Claims

1. An LED illumination device, comprising:

a lampshade defining a room therein;

a plurality of LEDs being received in the room of the lampshade; and

a heat dissipation member arranged at a top side of the lampshade, comprising;

a heat pipe forming a planar absorbing surface and a dissipating surface opposite to the absorbing surface, the absorbing surface of the heat pipe attaching to the LEDs to absorb heat therefrom;

a heat sink including a base attaching to the dissipating surface of the heat pipe to absorb heat of the heat pipe and a plurality of fins extending from the base for dissipating heat absorbed from the heat pipe;

wherein the lampshade comprises a mounting wall and a side wall downwardly and slightly outwardly from a periphery of the mounting wall, cooperatively the mounting wall and the side wall defining the room receiving the LEDs;

wherein at least an opening is defined in the mounting wall accommodating the base of the heat sink therein, a pair of flanges respectively extending form two opposite lateral sides of the base and abutting a top side of the mounting wall to assemble the heat sink onto the mounting wall of the lampshade.

2. The LED illumination device of claim 1, wherein a groove is concaved from the base of the heat sink and receives the heat pipe therein, the dissipating surface of the heat pipe contacting the base at a bottom of the groove, and the absorbing surface of the heat pipe being coplanar with an outer surface of the base.

3. The LED illumination device of claim 1, wherein a groove is concaved from the base of the heat sink and receives the heat pipe therein, the dissipating surface of the heat pipe contacting the base at a bottom of the groove, and the absorbing surface of the heat pipe protruding out of the base.

4. The LED illumination device of claim 1, wherein a length of the fins decreases from a center towards two opposite lateral sides of the base.

5. The LED illumination device of claim 4, wherein a height of the fins decreases from a center towards the two opposite lateral sides of the base, and free ends of the fins cooperatively form a convex surface.

6. The LED illumination device of claim 1, wherein the base of the heat sink is substantially V-shaped, and forms a concave surface and an opposite convex surface, the fins extending upwardly from the concave surface, and the LEDs being arranged on the convex surface.

7. The LED illumination device of claim 1, wherein a pair of slots are defined in lateral sides of the base of the heat sink, and engage with a pair of pothooks adapted for fixing the LED illumination device to a supporting structure.

8. A light engine, comprising:

a flat-type heat pipe forming a planar absorbing surface and a planar dissipating surface opposite to the absorbing surface;

a plurality of LEDs attaching to the absorbing surface of the heat pipe; and

a heat sink comprising a base attaching to the dissipating surface of the heat pipe and a plurality of fins extending from the base;

wherein the base of the heat sink defines a pair of slots at two lateral sides thereof adapted for receiving two ends of two pothooks, respectively, for assembling the light engine to a supporting structure.

9. The light engine of claim 8, wherein the base of the heat sink is substantially V-shaped, and forms a concave surface and an opposite convex surface, the fins extending from the concave surface, and the LEDs being arranged on the convex surface.

10. The light engine of claim 9, wherein a height of the fins decreases from a center towards two opposite lateral sides of the base, and free ends of the fins cooperatively form a convex surface.

11. The light engine of claim 8, wherein a groove is concaved from the base of the heat sink and receives the heat pipe therein, the dissipating surface of the heat pipe contacting the base at a bottom of the groove, and the absorbing surface of the heat pipe being coplanar with an outer surface of the base.

12. The light engine of claim 8, wherein a groove is concaved from the base of the heat sink and receives the heat pipe therein, the dissipating surface of the heat pipe contacting the base at a bottom of the groove, and the absorbing surface of the heat pipe protruding out of the base.

13. The light engine of claim 8, wherein the base of the heat sink forms a pair of flanges at two lateral sides thereof adapted for mounting the light engine to a lampshade of a lamp.

14. An LED illumination device, comprising:

a lampshade defining a room therein;

a plurality of LEDs being received in the room of the lampshade; and

a heat dissipation member arranged at a top side of the lampshade, comprising;

a heat pipe forming a planar absorbing surface and a dissipating surface opposite to the absorbing surface, the absorbing surface of the heat pipe attaching to the LEDs to absorb heat therefrom;

a heat sink including a base attaching to the dissipating surface of the heat pipe to absorb heat of the heat pipe and a plurality of fins extending from the base for dissipating heat absorbed from the heat pipe;

wherein a pair of slots are defined in lateral sides of the base of the heat sink, and engage with a pair of pothooks adapted for fixing the LED illumination device to a supporting structure.