Patent ID: 6803528
Filing Date: 2004-10-12
Classification: H05K,Y10T

Abstract:
A multi-layer double-sided wiring board comprising:an insulating layer having an opening formed therein; a first conductive layer formed on an upper surface of the insulating layer; a second conductive layer formed on a lower surface of the insulating layer and covering an inside wall of the opening and a portion of the first conductive layer which is exposed in the opening; and an interface layer interposed between the insulating layer and at least a portion of one or both of the first and second conductive layers including the portion of the second conductive layer covering an inside wall of the opening, and wherein the first and second conductive layers are materials having the same conductivity, the interface layer contains a material different from the materials of the first and second conductive layers, and the second conductive layer directly contacts the first conductive layer in the portion of the opening adjacent the upper surface of the insulating layer without the interface layer being interposed therebetween.