Patent ID: 8624127
Filing Date: 2014-01-07
Classification: H05K,Y02P,Y10T

Abstract:
1. A wiring board, comprising: a substrate; a first wiring layer formed on a first surface of the substrate and including a first conductive circuit and a first conductive portion; a second wiring layer formed on a second surface of the substrate on an opposite side with respect to the first surface and including a second conductive circuit; an interlayer insulation layer formed on the substrate and the first wiring layer; and a third conductive circuit formed on the interlayer insulation layer, wherein the substrate has a first penetrating hole and a first through-hole conductor connecting the first conductive circuit and the second conductive circuit and formed on an inner wall of the first penetrating hole, the substrate has a filler portion filling inside the first through-hole conductor, a second penetrating hole penetrating through the filler portion inside the first through-hole conductor, and a second through-hole conductor formed in the second penetrating hole, the first conductive portion is formed on the filler portion of the first surface of the substrate and connected to a first end of the second through-hole conductor, the second through-hole conductor comprises a conductive material filling the second penetrating hole, the interlayer insulation layer has a via conductor formed in the interlayer insulation layer and connecting the third conductive circuit and the first conductive portion such that the third conductive circuit is connected to the second through-hole conductor, and the via conductor is positioned such that the via conductor is shifted from the center of the second through-hole conductor in a direction parallel to the first surface of the substrate.