Patent ID: 7721427

Claim:
A method of manufacturing a single-sided circuit substrate, comprising: providing a rigid insulating base member having a metal layer on a first surface of said rigid insulating base member and comprising one of an aramide nonwoven fabric cloth-epoxy resin, a glass cloth epoxy resin, an aramide nonwoven fabric cloth-polyimide, and a prepreg in a form of a B-stage, the prepreg comprising a glass cloth impregnated with phenol resin or bismaleimide-triazine resin; forming non-penetrating holes which reach said metal layer by a laser process in said rigid insulating base member; forming via holes comprising copper electrolytic plating in said non-penetrating holes such that said copper electrolytic plating of said via holes does not project over said non-penetrating holes; forming a conductive circuit by etching said metal layer; and forming projecting conductor portions projecting beyond a second surface of said rigid insulating base member on an opposite side of the first surface, said projecting conductor portions formed at said via holes, respectively, and comprising conductive paste or a metal material having a low melting point.