Patent ID: 7760501

Claim:
A heat dissipation apparatus, comprising: a heat sink comprising a plurality of radial fins, with an air channel between every two adjacent fins, at least some of the fins each comprising a main body and an airflow guiding flange extending upwardly and outwardly from a top side of the main body, the airflow guiding flange twisted in a radial direction, included angles defined between the airflow guiding flange and the main body gradually decreased from an inner side towards an outer side of the main body; and a fan mounted on the heat sink, for generating airflow towards the heat sink, with the airflow guided into the air channels between the fins via the airflow guiding flange; wherein the heat sink comprises a pair of first fin assemblies staggered with a pair of second fin assemblies, each of the first fin assemblies comprising a plurality of first fins, each of the second fin assemblies comprising a plurality of second fins, and the first fins and the second fins cooperatively forming the radial fins.