Patent ID: 8230904

Claim:
A heat dissipation device comprising: a fan for generating airflow; a heat sink comprising a top on which the fan is mounted, a bottom opposite to the top for contacting a heat-generating component to absorb heat, and a four lateral sides between the top and the bottom, a plurality of first fins extending upwardly towards the fan and a plurality of second fins located below tops of the first fins and extending toward two of the four lateral sides of the heat sink, the plurality of first fins defining a plurality of first airflow channels therebetween, and the plurality of second fins defining a plurality of second airflow channels therebetween; and a fan duct located at another one of the four lateral sides of the heat sink and guiding a part of the airflow of the fan to enter the second airflow channels of the heat sink from the another one of the four lateral sides of the heat sink wherein the fan duct comprises a main body and a pair of baffles, a bottom of the main body is attached to the bottom of the heat sink at the another one of the four lateral sides of the heat sink, a top of the main body is attached to a bottom side of the fan which faces the top of the heat sink, the top of the main body is spaced from the another one of the four lateral sides of the heat sink, the baffles extend from opposite lateral edges of the main body to lateral edges of the another one of the four lateral sides of the heat sink, a space is defined between the main body, the baffles and the another one of the four lateral sides of the heat sink for the part of the airflow of the fan to pass therethrough and enter the second airflow channels of the heat sink, and the main body is inclined outwardly relative to the bottom of the heat sink.