Patent ID: 9474158
Filing Date: 2016-10-18
CPC Classification: H01L,H05K

Claim Text:
1. A wiring board, comprising: a first resin insulation layer; an electronic component positioned on a first surface of the first resin insulation layer; a second resin insulation layer formed on the first surface of the first resin insulation layer such that the second resin insulation layer is embedding the electronic component on the first surface of the first resin insulation layer; a conductive layer formed on the second resin insulation layer; a third resin insulation layer formed on the conductive layer and the second resin insulation layer; and a connection via conductor formed in the second resin insulation layer such that the connection via conductor is connecting an electrode of the electronic component and the conductive layer on the second resin insulation layer, wherein the first resin insulation layer has a pad structure formed on a second surface side of the first resin insulation layer on an opposite side with respect to the first surface, and the first resin insulation layer has a coefficient of thermal expansion which is set lower than a coefficient of thermal expansion of the second resin insulation layer and a coefficient of thermal expansion of the third resin insulation layer.