Heat sink

Abstract

The heat sink has a first heat transfer plate member that has one surface thermally connected to a heat generating component and is thermally connected to a first heat dissipating fin section having thin plate fins; a second heat transfer plate member that has one surface thermally connected to a second heat dissipating fin section having thin plate fins; a heat pipe section that is provided between an opposite surface of the first heat transfer plate member and an opposite surface of the second heat transfer plate member to be thermally connected thereto; and a heat transfer block that is thermally connected to a side surface and an upper surface of the heat pipe section and arranged to sandwich the heat pipe section between the heat transfer block and the second heat transfer plate member.

1 . A heat sink comprising:
 a first heat transfer plate member that has one surface thermally connected to a heat generating component and is thermally connected to a first heat dissipating fin section having thin plate fins;   a second heat transfer plate member that has one surface thermally connected to a second heat dissipating fin section having thin plate fins;   a heat pipe section that is provided between an opposite surface of the first heat transfer plate member and an opposite surface of the second heat transfer plate member to be thermally connected thereto; and   a heat transfer block that is thermally connected to a side surface and an upper surface of the heat pipe section and arranged to sandwich the heat pipe section between the heat transfer block and the second heat transfer plate member.   
     
     
         2 . The heat sink of  claim 1 , wherein the heat pipe section comprises a plurality of heat pipes arranged side by side, at least one of the heat pipes has a bent part, and the heat transfer block is arranged to be thermally connected to side surfaces of outermost heat pipes of the heat pipes section and upper surfaces of the heat pipes. 
     
     
         3 . The heat sink of  claim 2 , wherein the thin plate fins of the first heat dissipating fin section are arranged in parallel to each other and vertical to the surface of the first heat transfer plate member and spaced from each other by a predetermined distance along a width direction of the first heat transfer plate member at a longitudinal end or over the surface of the first heat transfer plate member. 
     
     
         4 . The heat sink of  claim 2 , wherein the thin plate fins of the second heat dissipating fin section are arranged in parallel to each other and vertical to the surface of the second heat transfer plate member and provided in a longitudinal direction and almost over the surface of the second heat transfer plate member. 
     
     
         5 . The heat sink of any one of  claims 2  to  4 , wherein each of the heat pipes has a planular shape, the heat pipes are arranged in parallel to each other and in contact with each other at least at center thereof, and the bent part of the heat pipe is arranged along an end of the second heat transfer plate member on which the second heat dissipating fin section is arranged. 
     
     
         6 . The heat sink of any one of  claims 2  to  4 , wherein each of the heat pipes has a planular shape, the heat pipes are arranged in parallel to each other and spaced from each other so as to be out of contact from each other, and the bent part of the heat pipe is arranged along an end of the second heat transfer plate member on which the second heat dissipating fin section is arranged. 
     
     
         7 . The heat sink of any one of  claims 2  to  4 , wherein one of the heat pipes has straight shape, the heat pipe having straight shape is arranged at center along a longitudinal direction of the second heat transfer plate member, and other heat pipes are arranged symmetric or asymmetric with respect to the heat pipe having straight shape. 
     
     
         8 . The heat sink of any one of  claims 1  to  4 , further comprising a fixing portion for fixing the first heat transfer plate member and the second heat transfer plate member at a peripheral part of the heat sink while the heat pipe section is sandwiched between the first heat transfer plate member and the second heat transfer plate member.