Patent ID: 7385146

Claim:
A multilayer printed circuit board comprising: a substrate; at least one conductor circuit formed on the substrate; a plurality of insulating layers formed over the substrate, the insulating layers including a first insulating layer and a second insulating layer; and a plurality of conductor circuits formed between the insulating layers, wherein the first insulating layer is formed on a surface of the substrate and the at least one conductor circuit formed on the substrate, at least one of the conductor circuits and the second insulating layer are formed on the first insulating layer, the first insulating layer has a roughened surface comprising a plurality of octopus-trap shaped anchor structures, the at least one of the conductor circuits formed on the first insulating layer comprises an electroless plated film formed on the roughened surface of the first insulating layer and an electrolytic plated film formed on the electroless plated film, the at least one of the conductor circuits formed on the first insulating layer has a roughened side surface, the electroless plated film has a thickness of 0.1 to 5 μm, and the electrolytic plated film has a thickness of 5 to 30 μm.