Patent ID: 9101054
Filing Date: 2015-08-04
Classification: H01L,H05K

Abstract:
1. A multilayer printed wiring board comprising: a core substrate having a signal through-hole conductor formed through the core substrate; an interlayer insulation layer formed on the core substrate and having a via conductor formed through the interlayer insulation layer; and a conductor layer formed on the interlayer insulation layer and connected to the via conductor in the interlayer insulation layer, wherein the core substrate comprises a multilayer insulation structure, an outer power conductor layer formed on a first surface of the multilayer insulation structure, an outer ground conductor layer formed on a second surface of the multilayer insulation structure, an inner power conductor layer formed inside the multilayer insulation structure and an inner ground conductor layer formed inside the multilayer insulation structure, each of the inner ground conductor layer and the inner power conductor layer has a tapered end portion having a tapered angle satisfying 2.8<tan Θ<55, the signal through-hole conductor in the core substrate is penetrating through the inner ground conductor layer and the inner power conductor layer and insulated from the inner ground conductor layer and the inner power conductor layer, and the inner power conductor layer and the inner ground conductor layer are positioned between the outer power conductor layer and the outer ground conductor layer such that the inner power conductor layer is positioned between the inner ground conductor layer and the outer ground conductor layer and that the inner ground conductor layer is positioned between the outer power conductor layer and the inner power conductor layer.