Patent ID: 7509997
Filing Date: 2009-03-31
Classification: H01L

Abstract:
1. A heat sink assembly comprising: a heat sink defining a plurality of airflow channels extending through front and rear ends of the heat sink and a plurality of airflow grooves intersected with the airflow channels; and a fan mounted on a top side of the heat sink and blowing an airflow into the channels and the grooves of the heat sink; wherein a cross section of the heat sink has a substantially trapeziform configuration at which the grooves are defined, a part of the airflow flows through the channels to leave the heat sink via the front and rear ends thereof, and another part of the airflow flows through the grooves to leave the heat sink via lateral sides thereof; wherein the heat sink comprises a substrate and two wings extending outwardly and upwardly from a top of the substrate; wherein a plurality of first fins are disposed between the wings, and a plurality of second fins are disposed between the substrate and the wings, and wherein a part of the airflow channels is defined between the first fins and another part of the airflow channels is defined between the second fins; and wherein the grooves each are defined by cutting away upper portions of the first fins except midmost ones thereof, the wings and the second fins, the grooves each having a gradually increased depth from a middle of the heat sink towards a lateral side of the heat sink.