Patent ID: 7736457

Claim:
A printed wiring board manufacturing method comprising: preparing two copper clad laminates each comprising a resin layer and at least one copper foil laminated to the resin layer; bonding said two copper clad laminates such that the copper clad laminates are adhered foil to foil on respective bonding surfaces of the copper clad laminates; forming lands on respective non-bonding surfaces of said copper clad laminates; forming respective resin layers on the lands and the respective non-bonding surfaces of said copper clad laminates; forming via hole openings connected to the lands, respectively; forming via holes comprising a conductive material in the via hole openings, respectively; separating said copper clad laminates from each other at the respective bonding surfaces; and forming opposing via hole openings connected to the lands, respectively, from the respective bonding surfaces separated from each other with the opposing via hole openings are formed on opposite sides of the via holes with respect to the lands.