METHOD FOR MANUFACTURING MULTI-LAYER PRINTED CIRCUIT BOARD BY FORMING CENTER LAYER IN INTERMEDIATE PORTION OF BASE

摘要

PURPOSE: A method is provided to maintain strength of a base and allow for ease of handling of the base, by forming a center layer in the intermediate portion of the base. CONSTITUTION: A method comprises a step of providing a base(20) having first metal thin films(23) arranged at both sides of a center layer(21) and etching resist layers formed at surfaces of the first metal thin films; a step of forming a plating groove for exposing the first meal thin films by selectively removing the etching resist layers of the base; a step of forming a connection protrusion(27) by performing a plating process on the first metal thin films exposed through the plating groove; a step of removing the etching resist layers, and forming insulating layers on the first metal thin films such that the front end of the connection protrusion is exposed; a step of disposing second metal thin films(29) on the insulating layers and the connection protrusion; a step of cutting edges of the base such that two sections are obtained centering from the center layer; and a step of forming a circuit pattern by using the first or second metal thin film of one of two sections of the base.