Patent ID: 7568518
Filing Date: 2009-08-04
Classification: H01L

Abstract:
1. A heat sink comprising: a fin unit comprising a plurality of fins connected together, each fin defining a first surface and a second surface opposite the first surface, a channel being defined between the first surface and the second surface of two neighboring fins, an airflow flowing through the channel; a plurality protrusions formed on the first surface of the each fin, a sidewall interconnecting a windward side and opposite top and bottom sides of each of the protrusions and the each fin, the each of the protrusions defining a through hole at a leeward side of the airflow; and a heat pipe having a condensing section thermally connecting with the fin unit and an evaporating section configured for thermally connecting with a heat generating electronic device; wherein one of the protrusions located farthest from an inlet of the channel from which the airflow enters the channel has a height larger than that of any other protrusion; and wherein the protrusions are slant relative to a bottom edge of the each fin in a direction that tops of the protrusions are located nearer the inlet of the channel from which the airflow enters the channel than bottoms thereof.