Patent ID: 7415761
Filing Date: 2008-08-26
Classification: B23K,H01L,H05K,Y10T

Abstract:
1. A method of manufacturing a multilayered printed circuit board comprising a substrate on which a lower conductive circuit is formed, an insulating resin layer and an upper conductive circuit formed on the lower conductive circuit and having a structure that the lower conductive circuit and the upper conductive circuit are connected to each other through a via hole, the method of manufacturing a multilayered printed circuit board comprising: forming the lower conductive circuit on the substrate; forming the insulating resin layer on the lower conductive circuit; coarsening an entire surface of the insulating resin layer; forming a metal layer on the coarsened surface; etching the metal layer so as to form a first opening in the metal layer through which a portion of the coarsened surface of the insulating resin layer is exposed; irradiating the coarsened surface exposed through the first opening with a laser beam to remove the insulating resin layer to form a second opening for the via hole through which a portion of the lower conductive circuit is exposed; and forming the upper conductive circuit electrically connected to the lower conductive circuit through the via hole, wherein the coarsened entire surface has a maximum roughness of 0.01 μm to 5 μm.