Heat sink with non-uniform fins and transverse protrusion

摘要

A heat sink includes a generally rectangular flat base, a plurality of fins provided on the surface of the base in parallel to each other, a protrusion provided on the surface of the base along substantially the overall width of the base in the transverse direction to the fins. The fins become gradually shorter on one end side of the base. The ends of the fins are arranged on an oblique line with respect to a line perpendicular to the fins.