Heat sink and method of manufacture thereof

Abstract

In a first process of this method of manufacturing a heat sink, into a groove, formed in a base and both of whose side surfaces are provided with projections or concave portions and whose upper portion is open, from the groove open portion, there is fitted a pipe that has a diameter smaller than the gap between the edge portions of the open portion of the groove. Next, the pipe is pressed from above the open portion of the groove and the upper portion of the pipe is deformed so that it follows the plane of the open portion of the groove, and moreover both side portions of the pipe are deformed so that they follow along the inner surfaces of both side portions of the groove. By this second process, both side portions of the pipe are engaged with the projections or concave portions.

1 . A method of manufacturing a heat sink in which a heat sink is manufactured by fitting a pipe into a groove formed in a base, comprising:
 a first process of fitting into a groove, formed in a base and both of whose side surfaces are provided with longitudinally extending irregular portions and whose upper portion is open, from said groove open portion, a pipe that has a diameter smaller than the gap between the edge portions of said open portion of said groove; and   a second process of pressing upon said pipe from above said open portion of said groove and deforming the upper portion of said pipe so that it follows the plane of said open portion of said groove, and moreover deforming both side portions of said is pipe so that they follow along the inner surfaces of both side portions of said groove, and thereby engaging both side portions of said pipe with said irregular portions.   
     
     
         2 . A method of manufacturing a heat sink according to  claim 1 , wherein said irregular portions are projections. 
     
     
         3 . A method of manufacturing a heat sink according to  claim 1 , wherein said irregular portions are concave portions. 
     
     
         4 . A method of manufacturing a heat sink according to  claim 1 , wherein, in said first process, a fluid is enclosed in said pipe. 
     
     
         5 . A method of manufacturing a heat sink according to  claim 1 , wherein said second process comprises:
 a third process of installing a guide tool that has a guide surface that guides a pressing tool along the vertical direction against said open portion of said groove; and   a fourth process of guiding said pressing tool in the downwards direction along said guide surface of said guide tool that was installed by said third process, so that said upper portion of said pipe is pressed by a pressing surface of said pressing tool, and thereby said upper portion of said pipe is deformed so as to follow said plane of said open portion of said groove.   
     
     
         6 . A method of manufacturing a heat sink according to  claim 1 , further comprising a fifth process of, after deformation by said second process, cutting said upper portion of said pipe and/or the upper portion of said base, so that said upper portion of said pipe and said plane of said open portion of said groove substantially coincide with one another. 
     
     
         7 . A method of manufacturing a heat sink according to  claim 1 , wherein said projections or concave portions are provided at positions on said side surfaces of said groove that do not contact its said open portion. 
     
     
         8 . A heat sink manufactured by the method of  claim 1 . 
     
     
         9 . A heat sink manufactured by the method of  claim 2 . 
     
     
         10 . A heat sink manufactured by the method of  claim 3 . 
     
     
         11 . A heat sink manufactured by the method of  claim 4 .