Patent ID: 8106310

Claim:
A multi-layer printed circuit board comprising: a core substrate having a first surface and a second surface on an opposite side of the first surface; a plurality of first conductor circuits provided on the first surface and second surface of the core substrate, respectively; a plurality of interlayer resin insulating layers formed on the first conductor circuits and the first surface and second surface of the core substrate, respectively; and a plurality of through hole structures penetrating through the core substrate, the interlayer resin insulating layers and the first conductor circuits and comprising a resin filler filling a plurality of through holes formed through the core substrate, the interlayer resin insulating layers and the first conductor circuits, wherein said resin filler contains an epoxy resin, a curing agent and 10 to 50% of inorganic particles, and the plurality of interlayer resin insulating layers includes a refractory resin and soluble particles, and has a plurality of rough surfaces on which a plurality of second conductor circuits are formed, respectively.