Patent ID: 8378230
Filing Date: 2013-02-19
Classification: H01L,H05K,Y10T

Abstract:
1. A printed wiring board comprising: an interlayer resin insulation layer having a first surface and a second surface on an opposite side of the first surface, the interlayer resin insulation layer having a penetrating hole; a conductive circuit formed on the first surface of the interlayer resin insulation layer; a via conductor formed in the penetrating hole and connected to the conductive circuit on the first surface of the interlayer resin insulation layer; and a surface-treatment coating formed on a surface of the via conductor exposed from the second surface of the interlayer resin insulation layer through the penetrating hole, wherein the via conductor comprises a first conductive layer formed on a side wall of the penetrating hole and a plated-metal filling the penetrating hole, the surface of the via conductor is located inside the penetrating hole and recessed from the second surface of the interlayer resin insulation layer, the first conductive layer is formed on the side wall of the penetrating hole such that an end portion of the first conductive layer is located inside the penetrating hole and recessed from the surface of the via conductor, the via conductor has a second conductive layer between the first conductive layer and the plated-metal, and the second conductive layer is formed in contact with the plated-metal and the surface-treatment coating.