Patent ID: 8296947
Filing Date: 2012-10-30
Classification: B21D,H01L,Y10T

Abstract:
1. A heat sink comprising: a base with a plurality of recesses defined therein; a plurality of columned fins each having a head and a body extending from the head, the head being received in and higher than a corresponding recess of the base so that a portion of the head extending beyond the corresponding recess; and a cover jointing with the base and cooperating with the base to sandwich the heads of the columned fins therebetween to thereby secure the columned fins to the base, the cover having a portion thereof which contacts the head of each of the columned fins and forms a deformed part; wherein the recesses are defined at a bottom of the base, and a plurality of passages defined in a top of the base to communicate with the recesses and allow the bodies of the columned fins to penetrate therethrough, and wherein the cover covers on the bottom of the base, a portion of the cover which contacts a bottom end of the head of each of the columned fins protruding downwardly to form the deformed part; and wherein the deformed part is machined to be even with other parts of the cover.