Heat sink

Abstract

A heat sink includes a base and a number of fins perpendicularly extending from the base. The base includes a main body. The fins include a number of parallel first fins and two second fins sandwiching the first fins. Each second fin includes a main piece extending from the main body and a guiding piece extending from one end of the main piece.

What is claimed is: 
     
         1 . A heat sink, comprising:
 a base comprising a main body; and   a plurality of fins comprising a plurality of parallel first fins extending up from the main body and two second fins extending up from the main body and sandwiching the first fins, wherein each of the second fins comprises a main piece extending from the base and parallel to the first fins, and a guiding piece slantingly extending out from one end of the main piece.   
     
     
         2 . The heat sink of  claim 1 , wherein the base comprises four mounting portions formed from four corners of the main body. 
     
     
         3 . The heat sink of  claim 1 , wherein a plurality of heat pole is set on the main body and extends through the first fins. 
     
     
         4 . The heat sink of  claim 3 , wherein each of the heat pole is substantially U-shaped, and comprises a fixing portion fixed on the main body, a first heat pole extending perpendicularly from one end of the fixing portion, and a second heat pole extending from a top end of the first heat pole and parallel to the fixing portion, the second heat pole extends perpendicularly through the first fins. 
     
     
         5 . The heat sink of  claim 1 , wherein an inclined guiding surface is formed on a side surface of the main body.