Heat sink

Abstract

A heat sink includes a bottom plate, a number of first fins extending up from the bottom plate, and a number of second fins. The second fins are detachably connected to tops of the corresponding first fins.

What is claimed is: 
     
         1 . A heat sink, comprising:
 a bottom plate;   a plurality of first fins extending up from the bottom plate; and   a plurality of second fins detachably connected to tops of corresponding ones of the first fins opposite to the bottom plate.   
     
     
         2 . The heat sink of  claim 1 , wherein a bar is formed on a bottom of each second fin, a hooking slot is defined in a bottom of the bar, the top of the corresponding first fin engages in the hooking slot, a pair of resilient tabs extends from the bottom of the bar, the resilient tabs are located at opposite sides of the hooking slot and resiliently sandwich the corresponding first fin. 
     
     
         3 . The heat sink of  claim 2 , wherein each resilient tab is substantially C-shaped, arced toward the other resilient tab. 
     
     
         4 . The heat sink of  claim 1 , wherein the second fins are alternately mounted to the first fins.