Patent ID: 6796027
Filing Date: 2004-09-28
Classification: H05K,Y10T

Abstract:
A method of producing a printed wiring board comprising the steps of:providing a substrate with at least one of a projection and a concave; forming a first circuit pattern on said substrate; forming a second circuit pattern isolated from the first circuit pattern on said substrate; wherein when said substrate has the projection, the method comprises the steps of: forming a first conductive layer on the projection to make a temporary electrical connection between the first and second circuit patterns; performing electroplating by the passage of electric current through the first and second circuit patterns connected by the first conductive layer to simultaneously form a metal film on the first and second circuit patterns; and after the electroplating, removing the first conductive layer on the projection to provide electrical insulation between the first and second circuit patterns; wherein when said substrate has the concave, the method comprises the steps of: covering the concave with a material different from said substrate to obtain a cover portion; forming a second conductive layer on said cover portion to make a temporary electrical connection between the first and second circuit patterns; performing electroplating by the passage of electric current through the first and second circuit patterns connected by the second conductive layer to simultaneously form a metal film on the first and second circuit patterns; and after the electroplating, removing the second conductive layer on said cover portion to provide electrical insulation between the first and second circuit patterns.