Patent ID: 6423643
Filing Date: 2002-07-23
Classification: H01L,H05K

Abstract:
A process for producing a carrier substrate comprising the following steps of:coating respective surfaces, including a reference surface, of a metallic base with etching resist; partially removing said etching resist on said reference surface of the metallic base so as to form a central vacant pattern, a ring-like vacant pattern at a periphery of said central vacant pattern, and a connection vacant pattern spaced from said ring-like vacant pattern; half-etching said metallic base by using said etching resist as a mask and side-etching a part of said metallic base between said central vacant pattern and said ring-like vacant pattern so as to form a mount recessed area including a central recessed area and a stepped recessed area located at a periphery of said central recessed area, a depth of said central recessed area from said reference surface being greater than that of said stepped recessed area from said reference surface and also forming a peripheral recessed area spaced from said stepped recessed area and arranged at a peripheral region thereof; forming a mounting part metallic film and a connector part metallic film on said mount recessed area and on said peripheral recessed area, respectively; and removing said etching resist from said metallic base.