| 摘要 |
PROBLEM TO BE SOLVED: To provide a photomask capable of forming three-dimensional and fine circuit, and a process for production capable of producing three-dimensional circuit parts with one pieces of the photomask or the photomasks of a number smaller than the number of exposure surfaces. SOLUTION: The photomask A has apertures a1, a2, of desired patterns and is molded into a three-dimensional shape to be tightly arranged on the outer peripheries of the plastic molding which are the object to be plated. The photomask described above is manufactured by a selective laser sintering method or a lamination method of paper. The process for producing the three- dimensional circuit parts consists in successively subjecting the surface of the plastic molding to a plating treatment and resist treatment and executing exposure by arranging the photomask to the outer peripheries of the plastic molding in tight contact therewith. The plating of the exposed parts is then removed or the plating exclusive of the exposed parts is removed to form the circuit patterns. |
