Patent ID: 7832098

Claim:
A method of manufacturing a multilayered printed circuit board, comprising: forming a lower conductive circuit on a substrate; providing an insulating resin layer having a metal foil with a coarsened surface in contact with the insulating layer; laminating, heating and compressing the insulating resin layer on the lower conductive circuit such that the insulating resin layer is interposed between the metal foil and the lower conductive circuit; etching a portion of the metal foil to form an opening exposing a surface of the insulating resin layer coarsened by a transferred shape of the coarsened surface of the metal foil; irradiating the surface of the insulating resin layer exposed through the opening with a laser beam to remove a portion of the insulating resin layer and expose a portion of the lower conductive circuit; and forming an upper conductive circuit and a via hole connecting the lower conductive circuit and the upper conductive circuit.