Heat Sink and Method of Manufacturing the Same

Abstract

The invention seeks to provide a heat sink capable of sufficiently lessening the mounting dimensions of coil-shaped heat exchanging fin to offer a wide versatility and a suitable method for manufacturing the heat sink. The heat sink according to the invention comprises a heat exchanging substrate 1 made by forming material having high thermal conductivity into a cylindrical shape, and a heat exchanging fin 2 having coil elements, which is formed by winding a metal wire having high thermal conductivity into a coil and flattening the coil-shaped metal wire in whole with bringing the coil elements in contact with the adjacent ones in their mutually displaced state. The coil fin is secured on the outer surface of the heat exchanging substrate in their wound state.

1 . A heat sink comprising a heat exchanging substrate made by forming material having high thermal conductivity into a cylindrical shape, and a heat exchanging fin having coil elements formed by winding a metal wire having high thermal conductivity into a coil and flattening the coil-shaped metal wire in whole, said coil elements being in contact with the adjacent ones in their mutually displaced state, said coil fin being secured on the outer surface of said heat exchanging substrate in their wound state. 
   
   
       2 . The heat sink set forth in  claim 1 , wherein said heat exchanging substrate is provided in its outer peripheral surface with attaching portions for fitting the inner part of said heat exchanging fin thereinto. 
   
   
       3 . The heat sink set forth in  claim 1 , wherein said heat exchanging fin is continuously formed in a spiral manner relative to the axis line of said heat exchanging substrate. 
   
   
       4 . The heat sink set forth in  claim 1 , wherein said heat exchanging fin is divided into rings aligned orthogonal to the axis line of said heat exchanging substrate. 
   
   
       5 . The heat sink set forth in  claim 4 , wherein said heat exchanging substrate is formed by placing ring-shaped washers one on top of the other along the axis with said heat exchanging fin interposed fixedly between said washers. 
   
   
       6 . The heat sink set forth in  claim 1 , wherein said heat exchanging fin has its outer periphery partially cut off to form a radiation accelerating portion for expediting air convection of heat exchange fluid. 
   
   
       7 . The heat sink set forth in  claim 3 , wherein said heat exchanging fin has its outer periphery partially cut off to form a radiation accelerating portion for expediting air convection of heat exchange fluid. 
   
   
       8 . The heat sink set forth in  claim 4 , wherein said heat exchanging fin has its outer periphery partially cut off to form a radiation accelerating portion for expediting air convection of heat exchange fluid. 
   
   
       9 . The heat sink set forth in  claim 5 , wherein said heat exchanging fin has its outer periphery partially cut off to form a radiation accelerating portion for expediting air convection of heat exchange fluid. 
   
   
       10 . The heat sink set forth in  claim 1 , wherein said heat exchanging fin is cut off from its outer periphery to its inner periphery to form a convection expediting path for expediting air convection of heat exchange fluid. 
   
   
       11 . The heat sink set forth in  claim 3 , wherein said heat exchanging fin is cut off from its outer periphery to its inner periphery to form a convection expediting path for expediting air convection of heat exchange fluid. 
   
   
       12 . The heat sink set forth in  claim 4 , wherein said heat exchanging fin is cut off from its outer periphery to its inner periphery to form a convection expediting path for expediting air convection of heat exchange fluid. 
   
   
       13 . The heat sink set forth in  claim 5 , wherein said heat exchanging fin is cut off from its outer periphery to its inner periphery to form a convection expediting path for expediting air convection of heat exchange fluid. 
   
   
       14 . The heat sink set forth in  claim 6 , wherein said heat exchanging fin is cut off from its outer periphery to its inner periphery to form a convection expediting path for expediting air convection of heat exchange fluid. 
   
   
       15 . The heat sink set forth in  claim 7 , wherein said heat exchanging fin is cut off from its outer periphery to its inner periphery to form a convection expediting path for expediting air convection of heat exchange fluid. 
   
   
       16 . The heat sink set forth in  claim 8 , wherein said heat exchanging fin is cut off from its outer periphery to its inner periphery to form a convection expediting path for expediting air convection of heat exchange fluid. 
   
   
       17 . The heat sink set forth in  claim 9 , wherein said heat exchanging fin is cut off from its outer periphery to its inner periphery to form a convection expediting path for expediting air convection of heat exchange fluid. 
   
   
       18 . A heat sink a heat exchanging substrate made by forming material having high thermal conductivity into a flat plate shape, and a heat exchanging fin having coil elements formed by winding a metal wire having high thermal conductivity into a coil and flattening the coil-shaped metal wire in whole, said coil elements being in contact with the adjacent ones in their mutually displaced state, said coil fin being secured on the outer surface of said heat exchanging substrate in their wound state. 
   
   
       19 . A heat sink comprising a spirally wound heat exchanging fin having coil elements formed by winding metal wire having high thermal conductivity into a coil and flattening the coil-shaped metal wire in whole with bringing said coil elements in contact with the adjacent ones in their mutually displaced state. 
   
   
       20 . A method for manufacturing a heat sink, comprising the steps of making a heat exchanging fin formed in a long strap shape by winding a metal wire having high thermal conductivity into a coil and flattening the coil-shaped metal wire in whole with bringing said coil elements in contact with the adjacent ones in their mutually displaced state, and continuously winding said strap-like heat exchanging fin around the outer periphery of a heat exchanging substrate made by forming material having high thermal conductivity into a cylindrical shape. 
   
   
       21 . A method for manufacturing a heat sink, comprising the steps of making a heat exchanging fin formed in a long strap shape by winding a metal wire having high thermal conductivity into a coil and flattening the coil-shaped metal wire in whole with bringing said coil elements in contact with the adjacent ones in their mutually displaced state, and winding said heat exchanging fin around the outer periphery of a heat exchanging substrate made by forming material having high thermal conductivity into a cylindrical shape, while supplying said strap-like heat exchanging fin to said heat exchanging substrate being rotated. 
   
   
       22 . A method for manufacturing a heat sink claimed in  claim 20 , wherein said heat exchanging fin has their inner peripheral portions inserted in attaching portions formed in the outer surface of said heat exchanging substrate, and said heat exchanging substrate and heat exchanging fin are mechanically bonded by applying pressure thereto in the axial direction of said heat exchanging substrate. 
   
   
       23 . A method for manufacturing a heat sink, comprising the steps of making a heat exchanging fin formed in a long strap shape by winding a metal wire having high thermal conductivity into a coil and flattening the coil-shaped metal wire in whole with bringing said coil elements in contact with the adjacent ones in their mutually displaced state, and securing said strap-like heat exchanging fin on a heat exchanging substrate made by forming material having high thermal conductivity into a flat plate while maintaining said strap-like heat exchanging fin in a spiral shape. 
   
   
       24 . A method for manufacturing a heat sink, comprising the steps of making a heat exchanging fin formed in a long strap shape by winding a metal wire having high thermal conductivity into a coil, flattening the coil-shaped metal wire in whole with bringing said coil elements in contact with the adjacent ones in their mutually displaced state, and maintaining said strap-like heat exchanging fin in a spiral shape. 
   
   
       25 . A method for manufacturing a heat sink claimed in  claim 21 , wherein said heat exchanging fin has their inner peripheral portions inserted in attaching portions formed in the outer surface of said heat exchanging substrate, and said heat exchanging substrate and heat exchanging fin are mechanically bonded by applying pressure thereto in the axial direction of said heat exchanging substrate.