Patent ID: 7800216

Claim:
A multilayer printed wiring board comprising: a multilayer core substrate comprising a plurality of insulating layers, a front conductive layer formed on a surface of a front outermost one of the insulating layers, a rear conductive layer formed on a surface of a rear outermost one of the insulating layers, a plurality of inner conductive layers formed between the insulating layers, and a plurality of through holes electrically connecting the front, rear and inner conductive layers; an interlayer insulation layer formed over the multilayer core substrate; a conductive layer formed over the interlayer insulating layer and the multilayer core substrate, wherein one of the front and rear conductive layers comprises one of a power source conductive layer and a grounding conductive layer, the other one of the front and rear conductive layers comprises the other one of the power source and grounding conductive layers, the plurality of inner conductive layers comprises an inner power source conductive layer and an inner grounding conductive layer, the inner power source conductive layer has a thickness which is larger than a thickness of the power source conductive layer, and the inner grounding conductive layer has a thickness which is larger than a thickness of the grounding conductive layer.