Patent ID: 8664088
Filing Date: 2014-03-04
Classification: H01L,H01S,Y10T

Abstract:
1. A manufacturing method for a heat sink material, comprising the steps of: placing a discharge wire, on a material made of an alloy or a composite material including two or more types of elements, the material comprising a main surface which has a relatively large area and a secondary surface which has a relatively small area and which crosses said main surface at an edge where said main surface and said secondary surface cross, to be approximately parallel to said main surface, wherein said secondary surface is a surface on which a discharging process has previously been carried out using the discharge wire that is placed approximately parallel to said main surface; cutting said material by a discharging process using said placed discharge wire, such that an approximate radius of curvature at said edge is no greater than 30 μm; roughly finishing the cut surface by a discharging process using said placed discharge wire; and finely finishing the cut surface by a discharging process using said placed discharge wire, wherein an amount of offset in the discharging process is set to be no greater than 100% of the diameter of the discharge wire, in the step of roughly finishing the cut surface and in the step of finely finishing the cut surface, such that a number of chipped portions, which exist per 1 mm on a length of the edge portion on said secondary surface and have a width of no greater than 30 μm and a length of no greater than 50 μm, is no greater than 10.