Patent ID: 7992296

Claim:
A method of manufacturing a printed circuit board, the method comprising: providing a substrate on which a first insulation layer, a first circuit pattern, a second insulation layer and a resin layer are successively laminated; boring a through-hole penetrating the substrate, the first insulation layer, the first circuit pattern, the second insulation layer and the resin layer by a drill such that an inside of the through-hole becomes smeared; removing a smear of the inside of the through-hole by a desmear process to form roughness on the resin layer; forming a via making an electrical connection between layers through the through-hole; and forming a second circuit pattern on the resin layer having roughness formed thereon, wherein the forming the via and the forming the second circuit pattern are simultaneously performed after forming the roughness, the forming the via and the forming the second circuit pattern include steps of: forming a seed layer on the resin layer and on an inner wall of the through-hole; forming a plating resist on the seed layer, the plating resist corresponding toe the via and the second circuit pattern; performing electrolytic plating; removing the plating resist; and performing flash etching.