Patent ID: 6742581
Filing Date: 2004-06-01
Classification: F28F,H01L

Abstract:
A heat sink comprising:a base portion having grooves formed therein; and a plurality of thin plate fins erected on the base portion in parallel with each other, at least two fins of said plurality of thin plate fins having two-ply portions formed by folding lower end portions of the at least two fins in two, wherein said two-ply portions are inserted in the grooves formed in the base portion, wherein said at least two fins have: bent members formed at upper end portions of the at least two fins and folded generally at a right angle to abut against an adjoining fin, protrusions formed at leading end portions of said bent members, and recesses formed at root end portions of said bent members so that the recesses are jointed to said protrusions of the adjoining fin by fitting said protrusions therein, wherein an opening is formed between two bent members that are formed at end portions of the at least two fins, and wherein a space between the at least two fins is opened on an upper end side.