Patent ID: 7361849

Claim:
A multilayer printed circuit board comprising: a core substrate having a first surface, a second surface on an opposite side of the first surface, and at least one through-hole extending from the first surface to the second surface; a plurality of first conductor circuits formed on the core substrate, at least one of the first conductor circuits being positioned on the first surface and second surface of the core substrate, respectively, and electrically connected by the at least one through-hole; and a build-up wiring structure formed over one of the first surface and second surface of the core substrate and comprising a plurality of insulating layers and a plurality of conductor circuits formed between the insulating layers, the insulating layers including a first insulating layer and a second insulating layer, wherein the first insulating layer is formed on the at least one of the first conductor circuits and a surface of the core substrate on one of the first surface and second surface, the second insulating layer and at least one of the conductor circuits of the build-up wiring structure are formed on the first insulating layer, the first insulating layer has at least one viahole formed to electrically connect one of the first conductor circuits and at least one of the conductor circuits of the build-up wiring structure, the first conductor circuits and the conductor circuits of the build-up wiring structure have at least partially roughened surfaces, respectively, and the through-hole is filled with a resin filler including SiO 2 particles.