Patent ID: 7678685

Claim:
A method for producing an interposer interposed between a wiring board and an electronic element mounted on the wiring board and used to form an electronic device, and including a flat plate shaped substrate made of an inorganic material; a through wiring including conductors embedded in one or more through holes passing through the substrate; and an upper wiring and/or a lower wiring that are respectively formed in predetermined patterns on the surfaces of the substrate and electrically conducted through the through wiring, the method for producing the interposer comprising the steps of: applying an insulating material for at least wiring forming parts of the substrate; forming simultaneously or sequentially preliminary wiring patterns on layers made of the insulating material; and forming the through wiring, the upper wiring and the lower wiring on the preliminary wiring patterns, at that time, using a metal mold for forming the preliminary wiring patterns, and employing the metal mold as the through wiring, the upper wiring and the lower wiring, or applying a wiring material on the preliminary wiring patterns formed on the layers of the insulating material by transferring a fine structure pattern of the metal mold by a printing operation, a plating operation or a deposition to form the through wiring, the upper wiring and the lower wiring.