Heat sink

Abstract

Example embodiments may provide a heat sink capable of cooling even when hot spots generate a large amount of heat that is unevenly distributed in some regions of a heating element package. The heat sink may include a plurality of heat pipes including one end portions thermally connected to a heating element package provided with a heating element in a package and other end portions thermally connected to a heat dissipation unit, in which the plurality of heat pipes includes at least a first heat pipe and a second heat pipe having greater heat transport capacity than heat transport capacity of the first heat pipe.

What is claimed is: 
     
         1 . A heat sink comprising a plurality of heat pipes, each of which comprises one end portion thermally connected to a heating element package provided with a heating element in a package and another end portion thermally connected to a heat dissipation unit, wherein
 the plurality of heat pipes comprises at least a first heat pipe and a second heat pipe having greater heat transport capacity than the first heat pipe.   
     
     
         2 . A heat sink comprising a plurality of heat pipes, each of which comprises a central portion thermally connected to a heating element package provided with a heating element in a package and both end portions thermally connected to a heat dissipation unit, wherein
 the plurality of heat pipes comprises at least a first heat pipe and a second heat pipe having greater heat transport capacity than the first heat pipe.   
     
     
         3 . The heat sink according to  claim 1 , wherein
 one end portions of the plurality of heat pipes are disposed in parallel along an extending direction of the heating element package.   
     
     
         4 . The heat sink according to  claim 2 , wherein
 central portions of the plurality of heat pipes are disposed in parallel along an extending direction of the heating element package.   
     
     
         5 . The heat sink according to  claim 1 , wherein
 the heat transport capacity of the second heat pipe is greater than the heat transport capacity of the first heat pipe due to a difference in dimension in traverse directions of the first and second heat pipes, a difference in shapes in traverse directions of the first and second heat pipes, and/or a difference in a first wick structure accommodated in the first heat pipe and a second wick structure accommodated in the second heat pipe.   
     
     
         6 . The heat sink according to  claim 2 , wherein
 the heat transport capacity of the second heat pipe is greater than the heat transport capacity of the first heat pipe due to a difference in dimension in traverse directions of the first and second heat pipes, a difference in shapes in traverse directions of the first and second heat pipes, and/or a difference in a first wick structure accommodated in the first heat pipe and a second wick structure accommodated in the second heat pipe.   
     
     
         7 . The heat sink according to  claim 1 , wherein one end portions of the plurality of heat pipes are thermally connected to a heat receiving plate and the heat receiving plate is thermally connected to the heating element package. 
     
     
         8 . The heat sink according to  claim 2 , wherein central portions of the plurality of heat pipes are thermally connected to the heat receiving plate and the heat receiving plate is thermally connected to the heating element package. 
     
     
         9 . The heat sink according to  claim 1 , wherein the heat sink is for cooling the heating element package in which the heating element in plurality is disposed in an extending direction of the package. 
     
     
         10 . The heat sink according to  claim 2 , wherein the heat sink is for cooling the heating element package in which the heating element in plurality is disposed in an extending direction of the package. 
     
     
         11 . The heat sink according to  claim 9 , wherein one end portion of the second heat pipe is thermally connected to a position of the heating element. 
     
     
         12 . The heat sink according to  claim 10 , wherein a central portion of the second heat pipe is thermally connected to a position of the heating element. 
     
     
         13 . The heat sink according to  claim 1 , wherein the heat sink is for cooling the heating element package comprising a hot spot generating a large amount of heat in an extending direction of the package. 
     
     
         14 . The heat sink according to  claim 2 , wherein the heat sink is for cooling the heating element package comprising a hot spot generating a large amount of heat in an extending direction of the package. 
     
     
         15 . The heat sink according to  claim 13 , wherein one end portion of the second heat pipe is thermally connected to the hot spot. 
     
     
         16 . The heat sink according to  claim 14 , wherein a central portion of the second heat pipe is thermally connected to the hot spot.