Patent ID: 7100275
Filing Date: 2006-09-05
Classification: H05K,Y10T

Abstract:
1. A method of producing a multi-layered wiring board comprising: forming an insulating layer of a photosensitive resin on a substrate, and exposing and developing said insulating layer to form holes having respective sizes in said insulating layer; depositing a curable resin member selected from the group consisting of polymethylsiliceous siloxane, a melamine resin, an acrylate resin, and an epoxy resin, and containing particles of one of calcium carbonate and polybutadiene rubber, onto said insulating layer having the holes and filling the holes; heating said curable resin to form a cured thin film from only a part of said curable resin, at an interface of said insulating layer and said curable resin, leaving a part of said curable resin uncured; removing the part of said curable resin that is uncured, but not said cured thin film, leaving via-holes where the holes were made in said insulating layer, the via-holes being smaller in size than the holes due to said cured thin film remaining in the holes on said insulating film; and filling the via-holes with an electrically conductive material, thereby forming vias.