Heat sink

• US 5,535,816 A
• Filed: 08/29/1994
• Issued: 07/16/1996
• Est. Priority Date: 10/15/1993
• Status: Expired due to Fees

• Current Assignee: Diamond Electric Manufacturing Company Limited
• Original Assignee: Diamond Electric Manufacturing Company Limited
• Inventors: Ishida, Yoshio
• Primary Examiner(s): Leo, Leonard R.
• Application Number:
  US08/294,830
• Time in Patent Office: 687 Days
• Field of Search: 165/80.3, 165/80.4, 165/104.33, 165/185, 174/16.3, 257/713, 257/715, 257/721, 257/722, 361/690, 361/698, 361/692, 361/700-4, 361/707, 361/709, 29/890.039, 29/890.04
• US Class Current: 165/80.3
• CPC Class Codes: F28F 3/02 Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations F28F3/08 takes precedence
• CPC Class Codes: H01L 23/3672 Foil-like cooling fins or heat sinks being part of lead-frames H01L23/49568
• 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 comprising a heat receiving plate and at least one piece of heat radiating fin stacked on the heat receiving plate, wherein slits which penetrate the heat radiating fin from the upper to lower surface are formed on a flat plate surface of the heat radiating fin, and a plurality of fin protrusions are provided in a portion on the flat plate surface where the slits are not formed, and all the fin protrusions or a portion of the fin protrusions of the stacked heat radiating fin are disposed at different positions on the heat radiating fin so that an interval between the heat receiving plate and heat radiating fin, or an interval between the stacked heat radiating fins is maintained by the fin protrusions.

Claims

1. A heat sink comprising:

a heat receiving plate adapted to be mounted on a heat generating body; and

at least one heat radiating fin stacked on said heat receiving plate, wherein slits which pass through said heat radiating fin are formed on a first portion of a flat plate surface of said heat radiating fin, and a plurality of fin protrusions are provided in a second portion on the flat plate surface, a first grouping of said plurality of fin protrusions is aligned and located along an edge of one of said slits and a second grouping of said plurality of fin protrusions is aligned and located along an opposite edge of said one of said slits, wherein each grouping is provided with a vally between adjacent fin protrusions, said valleys of said first grouping being aligned with said fin protrusions of said second grouping such that the fin protrusions of said first and second groupings are alternately provided along said edges of said one of said slits, wherein an interval between said heat radiating fin and one of said heat receiving plate and additional heat radiating fins is maintained by said fin protrusions.

2. The heat sink according to claim 1, wherein bottom surfaces of the fin protrusions of the stacked heat radiating fin are joined with a portion of an adjacent heat radiating fin to define said interval.

3. The heat sink according to claim 1, wherein each of said heat radiating fins defines a horizontal plane, and are stacked in a vertical direction, wherein said stacked heat radiating fins are adapted to receive convection air in both said horizontal and said vertical directions.

4. A heat sink comprising:

a heat receiving plate adapted to be mounted on a heat generating body; and

at least one heat radiating fin stacked on said heat receiving plate, wherein slits which pass through said heat radiating fin are formed on a first portion of a flat plate surface of said heat radiating fin, and a plurality of fin protrusions are provided in a second portion on the flat plate surface, wherein an interval between said heat radiating fin and one of said heat receiving plate and additional heat radiating fins is maintained by said fin protrusions, wherein heat pipes are disposed in at least one space formed between said stacked heat radiating fins.

5. A heat sink for dissipating heat from a heat generating body comprising:

a heat receiving plate adapted to be mounted on said heat generating body;

a plurality of heat radiating fins stacked on said heat receiving plate in a vertical direction, wherein slits are formed on a first portion of a flat plate surface of said heat radiating fin, and a plurality of fin protrusions are provided in a second portion on the flat plate surface, wherein said stacked heat radiating fins are adapted to receive convection air in said vertical direction, and wherein a grouping of said plurality of fin protrusions is aligned in a row along an edge of one of said slits.

6. The heat sink according to one of claims 5, wherein bottom surfaces of the fin protrusions of the stacked heat radiating fin are joined with a portion of an adjacent heat radiating fin so that an interval between the stacked heat radiating fins is maintained by said fin protrusions.

7. A heat sink for dissipating heat from a heat generating body comprising:

a heat receiving plate adapted to be mounted on said heat generating body;

a plurality of heat radiating fins stacked on said heat receiving plate, wherein slits are formed on a flat plate surface of said heat radiating fin, and a plurality of fin protrusions are provided in a portion on the flat plate surface, and bottom surfaces of the fin protrusions of the stacked heat radiating fin are joined with a portion of an adjacent heat radiating fin so that an interval between the stacked heat radiating fins is maintained by said fin protrusions a first grouping of said plurality of fin protrusions is aligned and located along an edge of one of said slits and a second grouping of said plurality of fin protrusions is aligned and located along an opposite edge of said one of said slits, wherein each grouping is provided with valley between adjacent fin protrusions, said valleys of said first grouping being aligned with said fin protrusions of said second grouping such that the fin protrusions of said first and second groupings are alternately provided along said edges of said one of said slits, and wherein the flat plate surface of said heat radiating fin is longitudinally disposed and joined with said heat receiving plate so that said heat radiating fin makes an approximate right angle with said heat receiving plate.

8. The heat sink according to claim 7, wherein said heat receiving plate is provided with a fin guide, and said heat radiating fin is supported by said fin guide.

9. The heat sink according to one of claims 7, wherein heat pipes are disposed in at least one space formed between said stacked heat radiating fins.