Patent ID: 7447023

Claim:
A heat dissipation device mounted in a computer enclosure, comprising: a heat sink for contacting a heat-generating device of a VGA card in the computer enclosure; a fan having an inlet port and an outlet port, the outlet port communicating with an inner space of the computer enclosure and outer ambient air outside the computer enclosure; and a fan duct having two opposite free open ends, one of the open ends engaging with the heat sink and the other open end engaging with the inlet port of the fan; wherein when the fan is operated, an airflow is generated to flow through the heat sink, the fan duct, the inlet port of the fan and then the outlet port of the fan to reach the outer ambient air outside the computer enclosure, whereby heat generated by the heat-generating device of the VGA card is dissipated to the outer ambient air; wherein the heat sink comprises a base, a plurality of fins mounted on the base and a cover mounted to the base and covering the fins; wherein an intake is defined by the base and the cover of the heat sink, and the cover defines an opening in alignment with the fan duct; and wherein the base comprises a rectangular main body and a semicircular extension extending from a lateral side of the main body, the fins being mounted on the main body of the base and the opening of the cover facing to the semicircular extension of the base.