Patent ID: 6716572
Filing Date: 2004-04-06
Classification: H05K,Y10S,Y10T

Abstract:
A manufacturing process for a printed wiring board in which a copper clad laminate obtained by bonding a copper foil on resin as a substrate material is irradiated with carbon dioxide laser light to form a through hole or a hole such as IVH, BVH or the like therein and interlayer connection layer formation is performed, followed by performing circuit formation, characterized by comprising the steps of:forming a nickel layer as an additional metal layer of 0.08 to 2 &mgr;m in thickness on a surface of said copper foil residing in an external layer of said copper clad laminate; irradiating a surface of said nickel layer with said laser light at a prescribed position where said through hole or said hole such as IVH, BVH or the like is to be formed in said copper clad laminate to thereby remove said nickel layer, said copper foil and said resin layer as a substrate material simultaneously into a desired shape; using an etching method and a physical polishing method, singly or in combination, to remove said nickel layer as a surface layer of said copper clad laminate after the laser drilling; performing interlayer connection layer formation to obtain interlayer connection in said copper clad laminate from which said nickel layer is removed; and forming an etching resist layer on a surface of said copper clad laminate after copper plating, followed by exposure, development, circuit etching, and etching resist removal.