Heat sink

Abstract

A heat sink includes a base and a number of fins mounted parallelly on the base. Each fin defines a number of vents, and two heat dissipating pieces protrude from opposite sides of each vent. The heat dissipating pieces of each vent cooperatively bounds an opening communicating with the corresponding vent. The number of openings of each fin is aligned with the number of openings of the other fins. The aligned openings of the number of fins cooperatively define a number of first air channels perpendicular to the number of fins. The number of heat dissipating pieces bound a number of second air channels parallel to the number of fins.

What is claimed is: 
     
         1 . A heat sink, comprising:
 a base; and   a plurality of parallel fins mounted on the base, wherein each fin defines a plurality of vents, and at least two heat dissipating pieces protruding from each fin bounding two opposite sides of each vent, the heat dissipating pieces at opposite sides of each vent cooperatively bound an opening communicating with the corresponding vent, the plurality of openings of each fin is aligned with the plurality of openings of the other fins, the aligned openings of the plurality of fins form a plurality of first air channels perpendicular to the plurality of fins, the plurality of heat dissipating pieces of each fin bound a plurality of second air channels parallel to the plurality of fins.   
     
     
         2 . The heat sink of  claim 1 , wherein each fin is substantially rectangular, the plurality of vents is arrayed along a lengthwise direction and a widthwise direction of the fin. 
     
     
         3 . The heat sink of  claim 2 , wherein each vent is substantially rectangular.