Patent ID: 7540082

Claim:
A method of manufacturing a printed wiring board, comprising: providing a base substrate; forming a through hole in said base substrate; forming a first conductor layer on a surface of said through hole and a surface of said base substrate in the vicinity of an opening of said through hole; filling said through hole where said first conductor layer is formed with a photosensitive resin and forming the photosensitive resin on the opening of said through hole where said first conductor layer is formed and on a surface of said base substrate at least in the vicinity of said opening; performing a first exposure of said photosensitive resin at a first intensity to expose an upper portion of said photosensitive resin without exposing photosensitive resin located within said through hole; masking an area substantially above the opening of said through hole; performing a second exposure of unmasked photosensitive resin at a second intensity different than said first intensity; removing said exposed photosensitive resin; and forming a second conductor layer covering the photosensitive resin filled inside said through hole and coupling said second conductor layer to said first conductor layer.