Patent ID: 8186052
Filing Date: 2012-05-29
Classification: H05K,Y10T

Abstract:
1. A method of producing a substrate, comprising the steps of: forming a through-hole in a base member with the base member having a copper film and a plated layer; filling the through-hole with an insulating material; performing electroless plating to coat the surface of the base member, in which the through-hole has been filled with the insulating material, with an electroless-plated layer; applying photo resist on the electroless-plated layer formed on the surface of the base member; optically exposing and developing the photo resist so as to form a resist pattern coating an end face of the through-hole filled with the insulating material; etching an electrically conductive layer formed on the surface of the base member with using the resist pattern as a mask with the electrically conductive layer comprising the copper layer, the plated layer and the electroless-plated layer; and removing the resist pattern coating the end face of the through-hole from the base member with using the electroless-plated layer as a release layer, wherein the through-hole is a pilot hole for forming a plated through-hole section penetrating the through-hole; and the pilot hole is filled with the insulating material, and then the electroless plating for coating the surface of the base member is performed, wherein the electroless plating for coating the surface of the base member is performed, an end face of the pilot hole filled with the resin is coated with the resist pattern, and the conductive layer on the surface of the base member is etched to remove the resist pattern; and a through-hole penetrating the pilot hole is formed, and an inner face of the through-hole is coated by plating so as to form the plated through-hole section, and wherein cable layers are laminated on the both side faces of the base member after removing the resist pattern from the base member; and the through-hole penetrating the pilot hole is formed in the base member, on which the cable layers have been integrally laminated, so as to form the plated through-hole section.