Patent ID: 6571467
Filing Date: 2003-06-03
Classification: H05K,Y10T

Abstract:
A method for producing a double-sided wiring board comprising the steps of:providing a conductive substrate having first and second opposing conductive surfaces; forming a first insulating layer on said first conductive surface of said substrate; forming at least one via hole in said first insulating layer on said first conductive surface; thermally curing said first insulating layer on said first conductive surface, resulting in said second conductive surface having a first oxidized layer thereon; removing said oxidized layer formed on said second conductive surface of said conductive substrate; forming a second insulating layer on said second conductive surface from which said first oxidized layer is removed; forming at least one via hole in said second insulating layer; and forming thin conductive wiring on the surfaces of both said first and second insulating layers, including within both of said via holes, said forming of said thin conductive wiring on both said first and second insulating layers involving using only a single plating process.