Patent ID: 6818836
Filing Date: 2004-11-16
Classification: H01L,H05K,Y10T

Abstract:
A printed circuit board comprising:a ceramic substrate; a resin base layer integrally laminated on said ceramic substrate, said resin base layer being formed by pressing and heating a laminated body consisting of a conductor pattern forming film and said ceramic substrate, said conductor pattern forming film including a resin film made of a thermoplastic resin; a plurality of conductor patterns embedded in said resin base layer in a multilayered fashion with respect to a thickness direction of said resin base layer; a plurality of via-holes formed in said resin base layer, each of the plurality of via-holes being filled with an electrically conductive composition that electrically connects said conductor patterns in different layers; a first conductor pattern exposed on a surface of said resin base layer and connected with a first one of said plurality of embedded conductor patterns through the electrically conductive composition in one of the plurality of via-holes formed in said resin base layer, and a second conductor pattern formed on said ceramic substrate and connected with a second one of said plurality of embedded conductor patterns through the electrically conductive composition in another of the plurality of via-holes formed in said resin base layer, wherein said conductor pattern forming film is a single-sided conductor pattern film having said conductor pattern formed on only one surface of said resin film.