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Abstract

The invention relates to a sound transducer in fluoride polyvinylidene (FPVD), its process of manufacture and integration into a card producing acoustic signals transmittable by telephone route. The process is chiefly characterized in that it consists of making (10) dual surface metallization strips distributed over the entire width of a ribbon in FPVD of great length and of very narrow thickness, cutting (11) each metallization strip into a unit film, fixing (12) a portion of film onto a pre-determined site of an interconnection array made on the rear surface of the card, cutting away excess film, then placing the film portion under stress (13), in such manner that it may emit acoustic signals when voltage is applied to it. This process is highly useful for the manufacture of acoustic signal producing cards of very narrow thickness and low cost price.

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First Claim