# US 7,744,257 B2 · Heat dissipation device for LED lamp

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- Number: US 7,744,257 B2
- Document ID: US7744257B2
- Status: Granted
- Kind: B2
- Application number: 12/024,961
- Filed: 2008-02-01
- Published: 2009-08-06
- Granted: 2010-06-29
- Earliest claimed: 2008-02-01
- Assignees: Fu Zhun Precision Industry (Shen Zhen) Co., Ltd.; Foxconn Technology Co., Ltd.
- Inventors: Zhi-Yong Zhou; Guang Yu; Qiao-Li Ding
- Web page: https://patentgrep.com/patent/US7744257B2

## CPC

- F21V 29/763: {the planes containing the fins or blades having the direction of the light emitting axis}
- F21K 9/00: Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21V 29/51: using condensation or evaporation of a fluid, e.g. heat pipes
- F21V 29/75: with fins or blades having different shapes, thicknesses or spacing
- F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements
- F21Y 2115/10: Light-emitting diodes [LED]
- H10W 40/73: for cooling by change of state
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A heat dissipation device adapted for removing heat from LED modules of an LED lamp includes a plurality of heat sinks, a plurality of fin sets and a plurality of heat pipes extending through the fin sets and thermally connecting the heat sinks and the fin sets together. The heat sinks each have a base plate with a bottom surface which is kept in contact with corresponding LED modules and a plurality of fins arranged on a top surface of the base plate. Each of the fin sets consists of a plurality of flakes and defines a plurality of air passages between the flakes. Air can flow through the heat dissipation device from a place thereunder to a place thereabove via the air passages between the flakes of the fin sets.

## Claims

### Claim 1

A heat dissipation device adapted for removing heat from LED modules of an LED lamp comprising:
a plurality of heat sinks each having a base plate with a bottom surface for contacting with corresponding LED modules and a plurality of fins arranged on the base plate;
a plurality of fin sets arranged alternately with the heat sinks, each of the fin sets consisting of a plurality of flakes and defining a plurality of air passages between the flakes; and
a plurality of heat pipes extending through the fin sets and thermally connecting the base plates of the heat sinks and the fin sets together.

### Claim 2 (depends on 1)

The heat dissipation device as claimed in claim 1, wherein heat pipes are embedded in the base plates of the heat sinks.

### Claim 3 (depends on 1)

The heat dissipation device as claimed in claim 1, wherein each of the flakes defines a plurality of through holes therein and flanges extending perpendicular from edges of the through holes, and the flakes defining the through holes incorporate with corresponding flanges to form tubes receiving the heat pipes therein.

### Claim 4 (depends on 3)

The heat dissipation device as claimed in claim 3, wherein each of the flakes has a plurality of spaced tabs extending perpendicularly from upper and lower edges thereof and toward a lateral side thereof.

### Claim 5 (depends on 3)

The heat dissipation device as claimed in claim 3, wherein the through holes are spaced from each other with a predetermined distance and located adjacent to a bottom edge of the each flake.

### Claim 6 (depends on 5)

The heat dissipation device as claimed in claim 5, wherein the fins are parallel to two opposite long sides of each of the base plates and the flakes.

### Claim 7 (depends on 6)

The heat dissipation device as claimed in claim 6, wherein the heat sinks each define a plurality of receiving channels perpendicularly to fins and parallel to two opposite short sides of the base plate thereof, and the base plate at a bottom of each of the receiving channels defines a recession which is communicated and aligned with a corresponding tube of a corresponding fin set and receiving a corresponding heat pipe therein.

### Claim 8

An LED lamp comprising:
a plurality of heat sinks, each of the heat sinks comprising a base plate and a plurality of fins arranged on the base plate;
a plurality of fin sets each comprising a plurality of flakes and defining a plurality of air passages between the flakes;
a plurality of LED modules attached a bottom of the base plate of each of the heat sinks; and
a plurality of heat pipes extending through the fin sets and the base plates of the heat sinks and thermally connecting the fin sets and the base plates together, wherein the fin sets and the heat sinks are alternate with each other.

### Claim 9 (depends on 8)

The LED lamp as claimed in claim 8, wherein each LED module comprises a printed circuit board attached to the bottom of the base plate and a plurality of LEDs mounted on the printed circuit board.

### Claim 10 (depends on 8)

The LED lamp as claimed in claim 8, wherein the heat pipes are embedded in the base plates of the heat sinks.

### Claim 11 (depends on 8)

The LED lamp as claimed in claim 8, wherein each of the flakes defines a plurality of through holes therein and flanges extending perpendicular from edges of the through holes, the flakes defining the through holes incorporate with corresponding flanges to form tubes receiving the heat pipes therein.

### Claim 12 (depends on 8)

The LED lamp as claimed in claim 8, wherein the fins are parallel to two opposite long sides of each of the base plates and the flakes.

### Claim 13 (depends on 12)

The LED lamp as claimed in claim 12, wherein the heat sinks each defines a plurality of receiving channels perpendicular to the fins, and the base plate at a bottom of each of the receiving channels defines a recession which is communicated and aligned with a corresponding tube of a corresponding fin set and receiving a corresponding heat pipe therein.

### Claim 14

An LED lamp comprising:
two heat sinks each comprising a base plate with a bottom surface and a top surface, and a plurality of fins extending upwardly from the top surface of the base plate of the each heat sink;
a fin set located between the heat sinks and comprising a plurality of flakes defining a plurality of passages therebetween;
a heat pipe extending through the flakes and thermally connecting the fin set and the heat sinks together, wherein air can flow from a place under the fin set to a place above the fin set via the passages; and
a plurality of LED modules attached to the bottom surface of the base plate of the each heat sink, each LED module having a printed circuit board and a plurality of LEDs mounted on the printed circuit board.

### Claim 15 (depends on 14)

The LED lamp as claimed in claim 14, wherein the base plate defines a recession in the top surface thereof, and the heat pipe has a portion embedded in the recession.