Heat Sink

Abstract

The present invention provides a heat sink having improved heat-exchange. A heat sink ( 10 ) which transfers heat dissipated from a heat generating device ( 12 ) to a cooling fluid (CF), said heat sink comprises: a planar base plate portion ( 11 ) that is thermally connected to the heat generating device ( 12 ); and a fin unit ( 10 A) having a plurality of louvers ( 13 ) and a frame portion ( 14 ) that connects to the plurality of louvers and surrounds thereof. One edge of said plurality of louvers is thermally connected to the base plate portion; and said frame portion is situated apart from a principal surface of said base plate portion.

1 . A heat sink which transfers heat dissipated from a heat generating device to a cooling fluid, said heat sink comprises:
 a base plate portion formed in a planar manner and that is thermally connected to said heat generating device; and   a fin unit having a plurality of louvers and a frame portion that connects to and surrounds said plurality of louvers;   wherein one edge of said plurality of said louvers is thermally connected to said base plate portion; and   said frame portion is situated apart from a principal surface of said base plate portion.   
     
     
         2 . The heat sink of  claim 1 , wherein at least a part of said plurality of louvers is fabricated by cutting and forming from one metal plate, and said frame portion is fabricated by a portion of said metal plate that is not cut and formed. 
     
     
         3 . The heat sink of  claim 1 , wherein said plurality of louvers has a length extending parallel to a flow direction of said cooling fluid and a width for cutting and forming said louvers and a cutting angle for forming louvers;
 wherein at least several louvers from said plurality of louvers have a different configuration in at least one aspect selected from a different length, a different width or a different angle for cutting and bending said louvers.   
     
     
         4 . The heat sink of  claim 1 , wherein said fin unit comprises a first fin unit fabricated by stamping one metal plate, and a second fin unit fabricated by stamping another metal plate;
 wherein said louvers of said first fin unit have a different configuration from said louvers of said second fin unit in at least one aspect selected from a different length, a different width or a different angle for cutting and bending said louvers.   
     
     
         5 . The heat sink of  claim 1 , wherein said fin unit comprises a first fin unit fabricated by stamping one metal plate, and a second fin unit fabricated by stamping another metal plate;
 wherein one edge portion of said louvers of said first fin unit is thermally connected to said base plate portion, and one edge portion of said louvers of said second fin unit is thermally connected to the other edge portion of the louvers of said first fin unit.   
     
     
         6 . The heat sink of  claim 5 , wherein said frame portion of said first fin unit and said frame portion of said second fin unit are situated apart from each other. 
     
     
         7 . The heat sink of  claim 5 , wherein said frame portion of said first fin unit and said frame portion of said second fin unit are connected with each other. 
     
     
         8 . The heat sink of  claim 2 , wherein said fin unit comprises a first fin unit fabricated by stamping one metal plate and a second fin unit fabricated by stamping another metal plate;
 wherein a plurality of louvers of said first fin unit is situated between a plurality of louvers of the second fin unit.   
     
     
         9 . The heat sink of  claim 1 , wherein said fin unit is fabricated by stamping one metal plate, said frame portion is cut and formed from said metal plate, and said frame portion comprises a flow changing portion for changing a flowing direction of the cooling fluid. 
     
     
         10 . The heat sink of  claim 1 , wherein said cooling fluid is liquid; and
 a cover plate connected to the other edge of the plurality of louvers is situated so as to define a flow direction of said cooling fluid.   
     
     
         11 . The heat sink of  claim 1 , wherein said fin unit is fabricated by stamping a metal plate; and
 said fin unit is mounted onto said base plate by using filler.   
     
     
         12 . The heat sink of  claim 11 , wherein a base material of said metal plate is aluminum and said metal plate is a brazing sheet fabricated by cladding filler onto at least one principal surface of said metal plate. 
     
     
         13 . A heat sink which transfers heat dissipated from a heat generating device to a cooling fluid, said heat sink comprises:
 a base plate portion formed in a planar manner and that is thermally connected to said heat generating device; and   a fin unit having a plurality of louvers and a frame portion that connects to and surrounds said plurality of louvers;   wherein one edge of said plurality of louvers is thermally connected to said base plate portion; and   a wall of a flow channel is situated at a position facing said base plate portion, said fin unit is situated between said base plate and said wall of the flow channel, said wall of the flow channel constitutes said flow channel of said cooling fluid, and said frame portion is connected to said wall of flow channel in coherent manner.   
     
     
         14 . The heat sink of  claim 13 , wherein at least a part of said plurality of louvers is fabricated by cutting and forming from one metal plate, and said frame portion is fabricated by a portion of said metal plate that is not cut and formed. 
     
     
         15 . The heat sink of  claim 13 , wherein said plurality of louvers has a length extending parallel to a flow direction of said cooling fluid and a width for cutting and forming said louvers and a cutting angle for forming louvers;
 wherein at least several louvers from said plurality of louvers have a different configuration in at least one aspect selected from a different length, a different width or a different angle for cutting and bending said louvers.   
     
     
         16 . The heat sink of  claim 13 , wherein said fin unit comprises a first fin unit fabricated by stamping one metal plate and a second fin unit fabricated by stamping another metal plate;
 wherein said louvers of said first fin unit have a different configuration from said louvers of said second fin unit in at least one aspect selected from a different length, a different width or a different angle for cutting and bending said louvers.   
     
     
         17 . The heat sink of  claim 13 , wherein said fin unit comprises a first fin unit fabricated by stamping one metal plate, and a second fin unit fabricated by stamping another metal plate;
 wherein one edge portion of said louvers of the first fin unit is thermally connected to the base plate portion, and one edge portion of said louvers of said second fin unit is thermally connected to the other edge portion of the louvers of said first fin unit.   
     
     
         18 . The heat sink of  claim 14 , wherein said fin unit comprises a first fin unit fabricated by stamping one metal plate, and a second fin unit fabricated by stamping another metal plate;
 wherein a plurality of louvers of said first fin unit is situated between a plurality of louvers of said second fin unit.   
     
     
         19 . The heat sink of  claim 13 , wherein said fin unit is fabricated by stamping one metal plate and said frame portion is cut and formed from said metal plate, and said frame portion comprises a flow changing portion for changing a flow direction of the cooling fluid. 
     
     
         20 . The heat sink of  claim 13 , wherein said cooling fluid is liquid; and
 a cover plate connected to the other edge of the plurality of louvers is situated so as to define a flow direction of said cooling fluid.   
     
     
         21 . The heat sink of  claim 13 , wherein said fin unit is fabricated by stamping a metal plate; and
 the fin unit is mounted onto said base plate by using filler.   
     
     
         22 . The heat sink of  claim 21 , wherein a base material of said metal plate is aluminum and said metal plate is a brazing sheet fabricated by cladding filler onto at least one principal surface.