Patent ID: 6326561
Filing Date: 2001-12-04
Classification: H01L,H05K,Y10T

Abstract:
A thin-film multilayer wiring board comprising a plurality of thin-film layers laminated on a substrate and a wiring layer, which is a furthest wiring layer from the substrate, constituting an uppermost wiring layer,each thin-film layer, of the plurality of thin-film layers, including metallic wirings, at least one via stud and a resin for forming an organic insulating layer,a metallic wiring, of said metallic wirings, and a via stud, of said at least one via stud, being electrically connected in said each thin-film layer, and metallic wirings in different thin-film layers being electrically connected by via studs of the thin-film layers,each via stud, of the at least one via stud of a thin-film layer, of the plurality of thin-film layers, being made of a conductive metal filled in a via hole so as to completely fill the via hole with the conductive metal and formed by electroless plating on a metallic wiring of said metallic wirings of said thin-film layer,a via stud of a first thin-film layer, of the plurality of thin-film layers, laminated on the substrate, having a flat surface, said flat surface being the surface of the via stud of the first thin-film layer furthest from the substrate, the flat surface being at a same level as a top surface of the first thin-film layer, and the via stud of the first thin-film layer, having the flat surface, being electrically connected to a metallic wiring of a second thin-film layer, of the plurality of thin-film layers, laminated on and adjacent to the first thin-film layer, anda via stud, of the at least one via stud, of the second thin-film layer being positioned above the via stud, of the first thin-film layer, having the flat surface.