Patent ID: 7267167

Claim:
A heat sink comprising: multiple fins mounted together and each fin having a through hole defined through the fin; a first annular flange formed on the fin around the through hole and having a central hole defined through the first annular flange and an inner surface; and a second annular flange formed on the inner surface of the first annular flange, extending out from the first annular flange and having an inner surface, an outer diameter being identical to an inner diameter of the first annular flange and a length being smaller than a length of the first annular flange, wherein the second annular flange of one of adjacent fins is inserted in the central hole of the first annular flange of the other of the adjacent fins to define multiple cavities in the fins; a heat pipe having an outer surface and extending through the through holes in the fins with the outer surface of the heat pipe contacting the inner surfaces of the second annular flanges; and a thermal-conductive medium mounted in the cavities in the fins and covering the inner surfaces of the first annular flanges and the outer surface of the heat pipe.