Patent ID: 9538642
Date: 2017-01-03
CPC Classifications: H05K,Y10T

Claim:
1. A wiring board, comprising: a core structure comprising a core substrate; and a buildup structure formed on the core structure and comprising an interlayer insulating layer and a conductive layer, wherein the interlayer insulating layer does not contain inorganic fiber and comprises a resin component and an inorganic filler such that the interlayer insulating layer comprises a filler layer including the inorganic filler and a resin layer formed on the filler layer and that the inorganic filler is not exposed on a surface of the resin layer, the conductive layer is formed on the interlayer insulating layer such that the conductive layer is formed on the surface of the resin layer and is not in contact with the inorganic filler in the interlayer insulating layer, and the resin layer of the interlayer insulating layer does not contain the inorganic filler or includes the inorganic filler such that the filler layer of the interlayer insulating layer includes the inorganic filler in an amount which is greater than an amount of the inorganic filler in the resin layer of the interlayer insulating layer.