Heat sink

Abstract

[Task] To improve the cooling efficiency of a heat sink without increasing the size of the heat sink. [Means for solution] A heat sink 1 includes a plurality of coolant passage 2, 3, and a connecting passage 4 connecting the coolant passages 2, 3 nonlinearly. A height of a fluid passage of the connecting passage 4 on an inflow side to which the coolant flows in is made greater than a height of the coolant passage 2 connected with the fluid passage on the inflow side. On the other hand, the height of the fluid passage of the connecting passage 4 is decreased to an end portion of the connecting passage 4 on an outflow side from which a cooling water flows out. In increasing the height of the fluid passage of the connecting passage 4 on the inflow side to which the cooling water flows in, gradually, the height of the connecting passage 4 is increased so as to equalize the height of a widthwise direction of the fluid passage of the coolant passage 2.

1 - 5 . (canceled) 
     
     
         6 . A heat sink comprising:
 two or more coolant passages arranged nonlinearly to convey a coolant for heat exchange with a heat of a component to be cooled; and   a connecting passage connecting the coolant passages;   wherein a fluid passage of the connecting passage on an inflow side to which a coolant flows in is enlarged in a direction of a height of a cross section, as compared with the coolant passage connected with the fluid passage on the inflow side; and   the fluid passage of the connecting passage is decreased in size in the direction of the height of the cross section toward an end portion of the connecting passage on an outflow side from which the coolant flows out from the connecting passage.   
     
     
         7 . The heat sink as recited in  claim 6 , wherein the height of the cross section of the fluid passage of the connecting passage on the inflow side to which the coolant flows in is increased gradually from a connection portion between the connecting passage and the coolant passage connected with the fluid passage on the inflow side. 
     
     
         8 . The heat sink as recited in  claim 6 , wherein the fluid passage of the connecting passage located on an extension of the coolant passage connected with the fluid passage on the inflow side is made substantially equal in cross section to the coolant passage connected with the fluid passage on the inflow side, and curved in a direction of a height of the cross section of the connecting passage. 
     
     
         9 . The heat sink as recited in  claim 6 , wherein the coolant passage connected with the fluid passage on the inflow side and the coolant passage connected with the fluid passage of the connecting passage on an outflow side from which the coolant flow out from the connecting passage are arranged in parallel to each other. 
     
     
         10 . The heat sink as recited in  claim 6 , wherein the coolant passages are arranged so that the component to be cooled is provided on an upper surface of each of the coolant passages.