Patent ID: 8661665
Filing Date: 2014-03-04
Classification: H05K,Y10T

Abstract:
1. A method for manufacturing a multilayer printed wiring board, comprising: forming a plurality of interlayer resin insulation layers and a plurality of conductive circuits formed on the interlayer resin insulation layers, the plurality of interlayer resin insulation layers including an outermost interlayer resin insulation layer; forming a pad configured to mount an electronic component on the outermost interlayer resin insulation layer; forming on the pad a coating layer comprising a metal layer and a coating film such that the metal layer of the coating layer is formed on a surface of the pad and the coating film of the coating layer is formed on the metal layer of the coating layer; forming a solder resist layer on the outermost interlayer resin insulation layer and the coating layer; forming an opening portion in the solder resist layer such that the opening portion exposes a portion of the coating layer covering the surface of the pad; removing the portion of the coating layer exposed by the opening portion of the solder resist layer such that the opening portion of the solder resist layer penetrates through the coating film and metal layer of the coating layer and exposes a portion of the surface of the pad; and forming a protective film on the portion of the pad exposed by the opening portion of the solder resist layer.