Patent ID: 7353600
Filing Date: 2008-04-08
Classification: H05K,Y10T

Abstract:
1. A circuit board fabrication method for forming a circuit board with a multi-layer structure onto an insulator substrate by a build-up process, comprising: (a) forming a first conductive interconnection onto the insulator substrate; (b) applying a resin film, which is to be an interlevel insulator layer for electrically insulating the first conductive interconnection and a second conductive interconnection, onto the insulator substrate; (c) making a pillar-like member stand on a prescribed position on the first conductive interconnection before applying the resin film by fixing the pillar-like member by providing one of a sticky layer and an adhesive layer between the first conductive interconnection and the pillar-like member; (d) hardening the resin film to form the interlevel insulator layer; (e) pulling out the pillar-like member to form an opening in the interlevel insulator layer; and (f) forming a second conductive interconnection onto the interlevel insulator layer in such a manner as to include the opening.