Patent ID: 8413713

Claim:
A heat sink, comprising: a base member, said base member having a plurality of stepped channels located on a top side thereof and arranged in parallel, wherein a bottom surface is formed at a lowest level of each stepped channel and a step surface is formed at a level higher than the bottom surface in each stepped channel, both the bottom surface and the step surface facing up; a plurality of first ribs protruding from said bottom surface and extending along one side of said stepped channels respectively; and a plurality of second ribs protruding from said step surface and extending along an opposite side of said stepped channels respectively; and a plurality of radiation fins respectively fastened to said stepped channels of said base member, each said radiation fin having a bottom end terminating in a Z-shaped foot portion having a profile matching that of the stepped channels, the Z-shaped foot portions of said radiation fins being respectively inserted into said stepped channels and secured thereto by the first ribs and second ribs of said base member that are stamped to clamp the Z-shaped foot portions of said radiation fins after insertion of the Z-shaped foot portions of said radiation fins into said stepped channels.