RADIATING SLUG HAVING CAVITY RECESS, ITS FORMING METHOD, AND SEMICONDUCTOR PACKAGE MATERIAL USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a radiating slug having a cavity recess in which the rear is flat, the dimensional precision of the depth of the cavity recess is high, and productivity can be improved, and its forming method or the like. SOLUTION: A metal plate 1 is subjected to pressure-shaping divided into a plurality of times by press working, in a state such that the rear face 2 is retained by a flat block. Thereby a cavity recess 3 having a specified depth (m) is formed. A boundary part 8 between a bottom surface 5 and a side surface 6 and a boundary part 9 between the side surface 6 and a surface 7 of recess periphery are formed as rectangular corner angles. The entire rear face 2 is formed flat. After that, the metal plate 1 is cut into segments as radiating slugs. Thus radiating slug S having the cavity recess 3 are formed.