Patent ID: 8683685
Filing Date: 2014-04-01
Classification: H05K,Y10T

Abstract:
1. A method of manufacturing a multilayer printed wiring board, comprising: forming a first interlaminar resin insulating layer; forming on the first interlaminar resin insulating layer a first conductor circuit comprising an electroplating film; forming a second interlaminar resin insulating layer on the first interlaminar resin insulating layer and the first conductor circuit; forming an opening portion in the second interlaminar resin insulating layer such that the opening portion exposes a surface portion of the electroplating film of the first conductor circuit; forming in the opening portion a via conductor comprising an electroless plating film and an electroplating film such that the electroless plating film is formed on an inner wall surface of the opening portion and the electroplating film is formed in direct contact with the surface portion of the electroplating film of the first conductor circuit; and forming on the second interlaminar resin insulating layer a second conductor circuit comprising an electroless plating film and an electroplating film such that the second conductor circuit is connected to the first conductor circuit through the via conductor.