Patent ID: 8205665

Claim:
A heat sink comprising: a first fin unit comprising a plurality of parallel stacked first fins, each comprising a main body and two flanges extending perpendicularly from two opposite sides of the main body; and a second fin unit comprising a plurality of parallel stacked second fins, each of the second fins comprising a main body and two flanges extending perpendicularly from two opposite sides of the main body of each second fin; wherein the first fin unit and the second fin unit are arranged side by side with the second fin unit arranged at a rear side of the first fin unit, the main body of an outmost first fin is adjacent to the second fin unit and abuts the main body of an outmost second fin adjacent to the first fin unit, and the flanges of the first fins and the second fins extend in opposite directions of the heat sink respectively; and wherein distal ends of the flanges of a rear first fin of each two neighboring first fins contact the main body of a front first fin of each two neighboring first fins, and the main body of a rear second fin of each two neighboring second fins contacts distal ends of the flanges of a front second fin of each two neighboring second fins.