Patent ID: 6698093
Filing Date: 2004-03-02
Classification: H05K,Y10T

Abstract:
A manufacturing method of circuitry forming substrates comprising the steps of:forming through holes or non-through holes on a plate-like or sheet-like substrate formed of a single material or a plurality of materials by irradiating an energy beam thereon; forming a connecting means in said through hole or non-through hole formed in said hole forming step to connect electrically between the upper surface and the lower surface of said substrate or between the outer layer and the inner layer of said substrate; and forming a circuit on the surface of said substrate by disposing a conductive layer formed of a metal foil or a thin film on said surface and patterning said conductive layer to a desired configuration, wherein said each respective step is performed independently or the elements of said respective step are intermingled with one another for the purpose of achieving what is intended for by said respective steps, and further comprising the steps of: attaching by adhesion a film-like separation film on a surface or both surfaces of said substrate before said step of forming holes; and having part of said separation film transferred onto said substrate at all or part of positions thereof, where a circuit or a land is formed in said step of forming a circuit.