Patent ID: 8754334
Filing Date: 2014-06-17
Classification: H01L,H05K

Abstract:
1. A multilayer printed wiring board, comprising: a multilayer core substrate; and a buildup structure formed on the multilayer core substrate and comprising an interlayer insulation layer and a conductive layer, wherein the multilayer core substrate includes an insulation structure, a first plane conductive layer formed on a first surface of the insulation structure, a second plane conductive layer formed on a second surface of the insulation structure on an opposite side of the first surface of the insulation structure, and an inner plane conductive layer formed in a plurality within the insulation structure between the first plane conductive layer and the second plane conductive layer, the plurality of inner conductive layers includes a first inner plane conductive layer, a second inner plane conductive layer and a third inner plane conductive layer positioned between the first and second inner plane conductive layers, the third inner plane conductive layer comprises a metallic plate, each of the first and second inner plane conductive layers has a thickness which is greater than thicknesses of the first plane conductive layer and the second plane conductive layer, the interlayer insulation layer and the conductive layer are each formed in a plurality in the buildup structure, and the multilayer core substrate and the buildup structure satisfy 1<a total thickness ratio of conductive layers≦40, where the total thickness ratio of conductive layers represents a sum of thicknesses of the first, inner and second plane conductive layers divided by a sum of thicknesses of the conductive layers in the buildup structure.