Abstract:
A method of forming a via hole in a circuit board including an insulating layer and a metal layer disposed on each of top and bottom surfaces of the insulating layer, the method including: selectively removing a portion of each of the metal layers where the via hole is to be formed thereby exposing the insulating layer; and removing the exposed insulating layer, wherein the removing of the exposed insulating layer includes chemically swelling the exposed insulating layer and removing the swollen insulating layer.
Abstract:
Provided is a method for manufacturing a circuit board provided with metal posts formed on at least one surface of the circuit board, the method including preparing a substrate made of a conductive material, performing a first selective etching a first surface of the substrate in regions corresponding to insulating portions of a first circuit pattern, laminating a first insulating layer over the first surface of the substrate, and performing a second etching on a second surface opposite of the first surface of the substrate, thereby forming the metal posts and the first circuit.