Heat sink

Abstract

A heat sink includes a first fin assembly including a number of first fins, and a second fin assembly including a number of second fins. The second fin assembly can be retracted into the first fin assembly to reduce volume of the heat sink when packing the heat sink, and the second fin assembly can be extend out of the first fin assembly to increase volume of the heat sink when using the first fin assembly for heat dissipation.

1 . A heat sink comprising:
 a base for absorbing heat generated by a heat generating device;   a heat pipe connected to the base;   a first fin assembly fixed to the heat pipe, the first fin assembly comprising a plurality of parallel first fins; and   at least one second fin assembly rotatably mounted to the heat pipe, each of the at least one second fin assembly comprising a plurality of parallel second fins;   wherein the second fins are received between adjacent first fins respectively, and the second fins are able to be rotated out of the corresponding adjacent first fins via rotation of the at least one second fin assembly.   
     
     
         2 . The heat sink of  claim 1 , wherein an operating bar is mounted to the second fin assembly, the second fin assembly able to be rotated via operating the operating bar. 
     
     
         3 . The heat sink of  claim 1 , wherein the at least one second fin assembly comprises two, the heat pipe comprises a first shaft and two second shaft perpendicularly extending from opposite ends of the first shaft respectively, the first shaft is inserted into the base, the first fin assembly is fixed to the second shafts, and the second fin assemblies are mounted to the second shafts respectively. 
     
     
         4 . The heat sink of  claim 1 , wherein a cross section of each of the second shafts is rounded. 
     
     
         5 . A heat sink comprising:
 a base for absorbing heat generated by a heat generating device;   a heat pipe connected to the base;   a first fin assembly fixed to the heat pipe; and   a second fin assembly movably mounted to the heat pipe;   wherein the first fin assembly comprises a plurality of first fins, the second fin assembly comprises a plurality of second fins, and the first fins and the second fins are staggered and parallel with each other;   wherein the second fin assembly is able to be move between a first position and a second position, in the first position the plurality of second fins are received among the plurality of first fins, and in the second position the plurality of second fins extend out of the plurality of first fins.   
     
     
         6 . The heat sink of  claim 5 , wherein an operating bar is mounted to the second fin assembly, the second fin assembly able to be moved via operating the operating bar. 
     
     
         7 . The heat sink of  claim 5 , wherein the heat pipe comprises a first shaft and a second shaft perpendicularly extending from the first shaft, the first shaft is inserted into the base, the first fin assembly is fixed to the second shaft, and the second fin assembly is movably mounted to the second shaft. 
     
     
         8 . The heat sink of  claim 7 , wherein the second fin assembly is rotatably mounted to the second shaft. 
     
     
         9 . The heat sink of  claim 8 , wherein a cross section of the second shaft is rounded. 
     
     
         10 . A heat sink comprising:
 a base for absorbing heat generated by a heat generating device;   a heat pipe comprising a first shaft and second shaft extending from the first shaft, the first shaft connected to the base;   a first fin assembly fixed to the second shaft, the first fin assembly comprising a plurality of parallel first fins; and   a second fin assembly movably mounted to the second shaft, each of the at least one second fin assembly comprising a plurality of parallel second fins;   wherein the second fins are received between adjacent first fins respectively, and the second fins are able to be moved out of the corresponding adjacent first fins via moving the at least one second fin assembly along a plane perpendicular with the second shaft.   
     
     
         11 . The heat sink of  claim 10 , wherein an operating bar is mounted to the second fin assembly, the second fin assembly able to be moved via operating the operating bar. 
     
     
         12 . The heat sink of  claim 10 , wherein the second fin assembly is rotatably mounted to the second shaft. 
     
     
         13 . The heat sink of  claim 12 , wherein a cross section of the second shaft is rounded.