Patent ID: 7812262
Filing Date: 2010-10-12
Classification: C25D,H05K,Y10T

Abstract:
1. A multilayer printed circuit board comprising a substrate; a first conductor circuit formed on the substrate; a first resin insulating layer having an opening for a via-hole, the first resin insulating layer being formed on the substrate and the first conductor circuit; a second conductor circuit formed on the first resin insulating layer; a via-hole connecting the first conductor circuit and the second conductor circuit, the via-hole being a filled via; wherein the second conductor circuit comprises an electroless plating film having a thickness which is from 0.1 to 5 μm and an electroplating film having a thickness which is from 3to 25 μm on the electroless plating film, the filled via comprises the electroless plating film and the electroplating film filling the opening, an entire upper face of the filled via is substantially flat, the upper face of the filled via and an upper face of the second conductor circuit are kept approximately in the same plane, and a distance from a bottom face to the upper face of the filled via is about 2 to 7 times as long as the thickness of the second conductor circuit.