Patent ID: 7605463

Claim:
An interposer interposed between a wiring board and an electronic element mounted on the wiring board and used to form an electronic device, the interposer comprising: 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, wherein the through wiring, the upper wiring and the lower wiring are respectively formed on preliminary wiring patterns that are additionally simultaneously or sequentially formed on layers made of an insulating material applied for at least wiring forming parts of the substrate, and respectively parts of a metal mold used for forming the preliminary wiring patterns, or layers made of a wiring material applied by a printing operation, a plating operation or a deposition on the preliminary wiring patterns formed on the layers of the insulating material by transferring a fine structure pattern of the metal mold, wherein the insulating material layer is provided on an upper surface of the substrate, a bottom surface of the substrate, and on inner parts at an inside portion of a through hole, and the preliminary wiring patterns are formed on inner parts of an insulating layer on inner parts of the through hole, and wherein the preliminary wiring pattern is an indented structure pattern corresponding to a wiring pattern formed on the insulating material.