Heat sink

• US 20070272399A1
• Filed: 09/25/2006
• Published: 11/29/2007
• Est. Priority Date: 05/25/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Katsumata, Kenji, Nitta, Kazuhiro, Takemura, Keizou
• Granted Patent: US 7,540,318 B2
• Time in Patent Office: Days
• US Class Current: 165/185
• CPC Class Codes: F28D 15/0233 the conduits having a particular shape, e.g. non-circular cross-section, annular F28D15/0241, F28D15/0266 take precedence
• CPC Class Codes: F28D 15/046 characterised by the material or the construction of the capillary structure
• CPC Class Codes: F28F 2255/18 sintered
• CPC Class Codes: H01L 23/427 Cooling by change of state, e.g. use of heat pipes by liquefied gas H01L23/445
• 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

A heat sink includes a first heat pipe having a flat plate-shape and a second heat pipe connected perpendicularly to the first heat pipe. The first heat pipe has a first wick provided along an inner surface thereof. The second heat pipe has a second wick provided along an inner surface thereof. Each of end portions of the first and second wicks in a connecting portion of the first and second heat pipes has a comb-toothed part formed in a convexoconcave form like teeth of a comb so that the first and second wicks are connected by the comb-toothed parts fitting to each other. The comb-toothed parts of the second wick traverses an interior of the first heat pipe and contacts with the first wick on an opposite side.

Claims

1. A heat sink comprising:

a first heat pipe having a flat plate-shape; and

a second heat pipe connected perpendicularly to the first heat pipe,

wherein said first heat pipe has a first wick provided along an inner surface thereof,

said second heat pipe has a second wick provided along an inner surface thereof,

each of end portions of said first and second wicks in a connecting portion of said first and second heat pipes has a comb-toothed part formed in a convexoconcave form like teeth of a comb so that said first and second wicks are connected by the comb-toothed parts fitting to each other, and

said comb-toothed part of said second wick traverses an interior of said first heat pipe and contacts with said first wick on an opposite side.

2. The heat sink as claimed in claim 1, wherein said first heat pipe is provided with a heat-receiving part.

3. The heat sink as claimed in claim 1, wherein said first and second wicks are formed of a porous sintered sheet.

4. The heat sink as claimed in claim 1, wherein said second heat pipe includes two pieces of heat pipes perpendicularly connected to said first heat pipe in parallel to each other, and a heat-receiving part is provided on an opposite side of a side of said first heat pipe where said second heat pipe is connected.

5. The heat sink as claimed in claim 4, wherein said two pieces of heat pipes of said second heat pipe are connected to the same surface of said first heat pipe, and heat-radiation fins are provided between said two pieces of heat pipes of said second heat pipe in parallel to the surface of said first heat pipe.

6. The heat sink as claimed in claim 5, further comprising heat-radiation fins provided perpendicular to said surface of said first heat pipe.

7. The heat sink as claimed in claim 4, wherein said two heat pipes of said second heat pipe are connected to opposite ends of the same surface of said first heat pipe, respectively, and heat radiation fins are provided between said two heat pipes of said second heat pipe in parallel to the surface of said first heat pipe.

8. The heat sink as claimed in claim 1, further comprising a third heat pipe connected perpendicular to said two heat pipes of said second heat pipe,

wherein said third heat pipe has a third wick provided along an inner surface thereof,

each of end portions of said second and third wicks in a connecting portion of said second and third heat pipes has a comb-toothed part formed in a convexoconcave form like teeth of a comb so that said second and third wicks are connected by the comb-toothed parts fitting to each other, and

said comb-toothed part of said second wick traverses an interior of said third heat pipe and contacts with said third wick on an opposite side.

9. The heat sink as claimed in claim 8, wherein said first heat pipe and said third heat pipe are connected to opposite ends of said second heat pipe facing and parallel to each other, and heat-radiation fins are provided parallel to said second heat pipe between said third heat pipe and said first heat pipe.

10. The heat sink as claimed in claim 9, wherein one of said first and third heat pipes is provided with a heat-receiving part.