Patent ID: 9048229
Filing Date: 2015-06-02
Classification: H01L,H05K

Abstract:
1. A printed wiring board, comprising: a core substrate having a cavity portion; an electronic component accommodated in the cavity portion of the core substrate; a first buildup layer laminated on a first surface of the core substrate and comprising an outermost interlayer resin insulation layer and an outermost conductive layer formed on the outermost interlayer resin insulation layer of the first buildup layer; and a second buildup layer laminated on a second surface of the core substrate on an opposite side of the first surface and comprising an outermost interlayer resin insulation layer and an outermost conductive layer formed on the outermost interlayer resin insulation layer of the second buildup layer, wherein the outermost interlayer resin insulation layer of the first buildup layer has a thermal expansion coefficient which is set lower than a thermal expansion coefficient of the outermost interlayer resin insulation layer of the second buildup layer.