Matsushita Electric Industrial Co., Ltd.

Nobuhiro Numoto

Masahiro Ito

Naoki Sera

Parts of a base film that correspond to respective movable contacts are formed into projections. Operating projections each including a projecting member fixed to a top surface of the base film by an adhesive resin are formed and correspond to the movable contacts, respectively. The adhesive resins have different fixed diameters.

Movable contact unit with operating projections, method of mounting operating projections and operating panel switch using movable contact unit with operating projections

Movable contact unit of the present invention comprises a plurality of dome-like movable contacts made of electrically conductive metal sheets capable of making an inflective action when depressed, a base film having an adhesive layer for retaining upper surfaces of the plurality of movable contacts, and a plurality of press-down projections bonded by adhesive to an upper surface of the base film in positions corresponding to center portions of the respective movable contacts, wherein the upper surface of the base film and underside surfaces of the press-down projections are each provided with a pretreated layer. The above structure has an advantage of strengthening the bonding between the adhesive and each of the pretreated layers formed on the adhering surfaces of the base film and the press-down projections, so as to provide the movable contact unit with outstanding reliability in maintaining the bonded condition for a long duration.

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Okayama, Japan

Nobuhiro Numoto