Method of polarizing a thermoplastic resin film
AssigneeKureha Kagaku Kogyo Kabushiki Kaisha
InventorsShinsuke Yoshikawa, Syuuzi Terasaki, Tohru Sasaki
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Abstract
A method is disclosed for polarizing a thermoplastic resin film having a continuous metal electrode on one surface and a plurality of discrete electrodes on the other surface. An additional thermoplastic resin film coated on one surface with an evaporated metal coating is placed on the first thermoplastic resin film such that the evaporated metal coating comes into contact with the discrete electrodes. A polarizing d.c. voltage is applied between the continuous metal electrode and the evaporated metal coating.
Claims5
A method of polarizing a first thermoplastic resin film having metallic electrodes evaporated on both surfaces thereof, said film being of the type capable of being polarized into a piezoelectric film by application of an electric field of a predetermined amount thereacross, one of said electrodes consisting of a plurality of individual electrode elements separated and insulated from one another, the improvement comprising the steps of placing onto said one electrode a laminate of an additional thermoplastic resin film having an evaporated continuous metal coating on one surface thereof, said laminate being placed so that said metal coating contacts said plurality of individual electrode elements, and applying said electric field between said metal coating and the other metallic electrode of said first thermoplastic resin film.
Dependencies are inferred from the claim text.