Patent ID: 9554462
Date: 2017-01-24
CPC Classifications: H01L,H05K

Claim:
1. A printed wiring board, comprising: a multilayer core substrate; a first buildup layer formed on a first surface of the multilayer core substrate and comprising an interlayer resin insulation layer and a conductive layer; a second buildup layer formed on a second surface of the multilayer core substrate and comprising an interlayer resin insulation layer and a conductive layer; and an end-surface through hole conductor formed along a side surface of the first buildup layer, a side surface of the multilayer core substrate and a side surface of the second buildup layer such that the end-surface through hole conductor is connecting the conductive layer of the first buildup layer and the conductive layer of the second buildup layer, wherein the multilayer core substrate includes a first conductive layer, a middle conductive layer, a second conductive layer, a first insulation layer interposed between the first conductive layer and the middle conductive layer and a second insulation layer interposed between the second conductive layer and the middle conductive layer, and the middle conductive layer is connected to the end-surface through-hole conductor and has a thickness which is greater than thicknesses of the first and second conductive layers.