Patent ID: 7495920

Claim:
A heat dissipation device comprising: a heat absorbing portion for absorbing heat from a heat generating device; a heat sink located on the heat absorbing portion and comprising a plurality of curved fins defining a plurality of curved passages therebetween, the passages each having an outlet at one end thereof and an inlet at another end thereof; and an airflow source conforming to the inlets of the passages of the heat sink for providing forced airflow to the heat sink; wherein a direction of the airflow from the airflow source is changed by the passages of the heat sink, a direction of the airflow out of the outlets of the passages of the heat sink are oriented substantially perpendicular to a direction of the airflow into the inlets of the passages of the heat sink; wherein each of the fins of the heat sink comprises a first section, a second section and an arced middle section smoothly connecting the first section and the second section; and wherein ends of the fins of the heat sink are flushed at the inlets of the passages of the heat sink but the ends of two outmost fins at the inlets project beyond the ends of the other fins between the two outmost fins.