Heat sink and method for manufacturing the same

Abstract

A heat sink and a method for manufacturing a heat sink are described. A plate-like base is manufactured with a plurality of parallel grooves and a plurality of fins by an impact extrusion process. A high temperature heat treatment is performed to soften the plate-like base. The fins are positioned in corresponding grooves and an equal force is applied to both ends of the plate-like base so that the grooves are deformed and the fins are fixedly positioned. The method is simpler and significantly cheaper than that for conventional heat sinks.

1 . A heat sink, comprising: 
 a plate-like base, having a plurality of parallel grooves; and    a plurality of fins, respectively positioned in the parallel grooves.    
   
   
       2 . The heat sink as claimed in  claim 1 , wherein the plate-like base and the fins are made of aluminum.  
   
   
       3 . The heat sink as claimed in  claim 1 , wherein the plate-like base and the fins are made of copper.  
   
   
       4 . The heat sink as claimed in  claim 1 , wherein the plate-like base has a central segment and two flange segments, and the two flange segments correspond to and extend from both ends of the central segment.  
   
   
       5 . The heat sink as claimed in  claim 1 , wherein the parallel grooves are U-shaped.  
   
   
       6 . The method of manufacturing a heat sink, the method comprising the steps of: 
 manufacturing a plate-like base with a plurality of parallel grooves and a plurality of fins by an impact extrusion process;    positioning the fins to corresponding grooves and applying an equal force to both ends of the plate-like base so that the grooves are deformed and the fins are fixedly positioned.    
   
   
       7 . The method as claimed in  claim 6 , wherein the plate-like base and the fins are made of aluminum.  
   
   
       8 . The method as claimed in  claim 6 , wherein the plate-like base and the fins are respectively made of copper and aluminum.  
   
   
       9 . The method as claimed in  claim 6 , wherein the plate-like base and the fins are manufactured by powder metallurgy.  
   
   
       10 . The method as claimed in  claim 6 , wherein the plate-like base is subjected to a high temperature heat treatment to soften the plate-like base.