Patent ID: 8729400
Filing Date: 2014-05-20
Classification: H01L,H05K

Abstract:
1. A multilayer printed wiring board, comprising: a core substrate; an interlayer insulation layer formed on the core substrate; and a conductive layer formed on the interlayer insulation layer, wherein said core substrate has a plurality of conductive layers comprising a plurality of power conductor layers, a plurality of ground conductor layers, and a plurality of signal conductor layers, the power conductor layers and the ground conductor layers are alternately formed in the core substrate, the plurality of power conductor layers is connected to power and includes an outer power conductor layer formed on a first surface of the core substrate and an inner power conductor layer formed inside the core substrate, the plurality of ground conductor layers is connected to ground and includes an outer ground conductor layer formed on a second surface of the core substrate and an inner ground conductor layer formed inside the core substrate, the plurality of signal conductor layers includes a first inner signal conductor layer and a second inner signal conductor layer, the first inner signal conductor layer is formed on a same layer as the inner power conductor layer, and the second inner signal conductor layer is formed on a same layer as the inner ground conductor layer, and at least one of the inner power and ground conductor layers in said core substrate is relatively thick compared to other ones of the inner power and ground conductor layers, and at least one of the outer power and ground conductor layers in said core substrate is relatively thin compared to other ones of the outer power and ground conductor layers.