Patent ID: 6852625

Claim:
A method for manufacturing a package substrate without using any plating lead line, comprising the steps of: a) laminating first dry films over upper and lower surfaces of a base substrate having via holes plated with a copper film and being formed at the upper and lower surfaces thereof with copper foils, and subjecting the first dry films to exposure and development processes, thereby exposing predetermined upper and lower surface portions of the base substrate; b) removing portions of the copper foils not covered by the first dry films in accordance with an etching process, thereby forming circuits on the upper and lower surfaces of the base substrate, respectively; c) stripping the first dry films, and forming a plated layer over all portions of the base substrate in accordance with an electroless plating process; d) laminating second dry films over the plated upper and lower surfaces of the base substrate, and subjecting the second dry films to exposure and development processes, thereby exposing portions of the plated upper and lower surfaces of the base substrate respectively corresponding to regions where Au is to be plated; e) removing the plated layer from the exposed upper and lower surface portions of the base substrate respectively corresponding to the regions where Au is to be plated, in accordance with an etching process; f) plating Au on the exposed upper and lower surface portions of the base substrate; g) stripping the second dry films, and removing the plated layer remaining on the base substrate in accordance with an etching process, thereby exposing the upper and lower circuits of the base substrate; and h) coating a solder resist on the exposed upper and lower circuits of the base substrate while exposing predetermined portions of the upper and lower circuits.