Patent ID: 9480156
Filing Date: 2016-10-25
CPC Classification: H01L,H05K,Y02P,Y10T

Claim Text:
1. A method for manufacturing a printed wiring board, comprising: preparing an insulative board; forming a metal film on a surface of the insulative board; covering a portion of the metal film with a first plating resist; forming a first plated-metal film on the metal film exposed from the first plating resist; covering a portion of the first plated-metal film with a second plating resist; forming a second plated-metal film on the first plated-metal film exposed from the second plating resist; removing the first and second plating resists; removing the metal film exposed by the first and second plated-metal films such that a wiring having a pad and a conductive circuit thinner than the pad is formed; forming a solder-resist layer on the surface of the insulative board and the wiring; forming in the solder-resist layer an opening that exposes the pad and a portion of the conductive circuit contiguous to the pad; and forming a solder bump on the pad by a reflow.