Patent ID: 7449791

Claim:
A multilayer printed circuit board comprising: a substrate having a conductor circuit; a multilayer structure comprising a plurality of interlaminar insulating layers and a plurality of conductor circuits, said interlaminar insulating layers and conductor circuits including a first interlaminar insulating layer laminated on said conductor circuit of said substrate, a second interlaminar insulating layer formed over said first interlaminar insulating layer, and an outermost conductor circuit having a plurality of conductor patterns formed on said second interlaminating layer; and a solder resist layer formed over said conductor patterns, wherein said solder resist layer has at least one opening portion, said at least one opening portion of said solder resist layer partially exposes at least one conductor pattern of said conductor patterns, said at least one opening portion of said solder resist layer and said at least one conductor pattern of said conductor patterns are structured such that said at least one opening portion and said at least one conductor pattern form at least one alignment mark for positioning a mask or mounting an electronic component, at least a part of the surface of the second interlaminar insulating layer is a roughened surface, and said at least one conductor pattern includes an electroless plated film formed on the roughened surface of the second interlaminar insulating layer and an electrolytic plated film formed on the electroless plated film.