Patent ID: 8822839

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 interlayer resin insulating layers including a plurality of lower interlayer resin insulating layers formed on the first and second surfaces of the core substrate, respectively, and a plurality of upper interlayer resin insulating layers formed on the lower interlayer resin insulating layers, respectively; a plurality of through-hole conductors formed in a plurality of penetrating holes penetrating through the core substrate and the lower interlayer resin insulating layers and including a plurality of first through-hole conductors and a plurality of second through-hole conductors; a plurality of conductor circuits formed on the lower interlayer resin insulating layers, respectively, and interposed between the lower interlayer resin insulating layers and upper interlayer resin insulating layers, respectively; a plurality of via-hole conductors including a plurality of lower via-hole conductors formed in the lower interlayer resin insulating layers and a plurality of upper via-hole conductors formed in the upper interlayer resin insulating layers; and a conductor pattern formed on one of the first and second surfaces of the core substrate and connecting the first through-hole conductors and the lower via-hole conductors, respectively, wherein the lower via-hole conductors are connected to the conductor circuits formed on the lower interlayer resin insulating layers, respectively, and positioned such that the plurality of lower via-hole conductors corresponds with a plurality of first external connection terminals, respectively.