Patent ID: RE43509

Claim:
A multilayer printed circuit board comprising a plurality of interlaminar insulating layers and conductor circuits, said printed circuit board being formed by laminating a first interlaminar insulating layer on a conductor circuit of a substrate and forming at least a second conductor circuit and a second interlaminar insulating layer on the first interlaminar insulating layer, wherein at least a part of the surface of the interlaminar insulating layers is a roughened surface, the conductor circuits are comprised of an electroless plated film formed on an interlaminar insulating layer and an electrolytic plated film formed on the electroless plated film, said electroless plated film having a thickness ranging from 0.1 μm to 5 μm and configured to follow the roughened surface of the interlaminar insulating layer , and a roughened layer at least a part of the surface of the conductor circuits is a roughened surface formed by a roughening treatment on at least a part of the surface of the conductor circuits .