PRINTED SUBSTRATE MANUFACTURING METHOD AND PRINTED SUBSTRATE EMPLOYING SAME

摘要

A method of producing a printed circuit board includes: forming a metal layer on a support plate; forming a mask layer on the metal layer; forming a pattern plating (6) having a stem (7) as a portion of plating up to a level equal to the height of the mask layer, and a cap (8) as a portion of plating exceeding the height of the mask layer and having an outgrowth (8a) lying over the surface of the mask layer; laminating an insulating base (10) on a conductive circuit board constituted by the support plate, the metal layer and the pattern plating (6) to form a circuit board intermediate in which the pattern plating (6) is buried in the insulating base (10); removing the support plate and the metal layer to form an exposed surface; and mechanically polishing the exposed surface until the stem (7) of the pattern plating is removed, to increase the line width of the conductive pattern on the exposed surface.