| 摘要 |
<p>A sound transducer made of polyvinylidene fluoride (PVDF) and a method for making and integrating same into a card designed to generate acoustic signals for transmission over a telephone line, are disclosed. The method mainly comprises forming (10) double-sided metallised strips over the full width of a very thin elongate PVDF tape, cutting (11) each metallised strip into a unitary film, fixing (12) a portion of the film in a predetermined point on an interconnection pattern provided on the back of the card, removing the excess film, and stressing (13) said film portion so that it is capable of transmitting acoustic signals when a voltage is applied thereto. The method is particularly useful for producing very thin, low-cost cards for generating acoustic signals.</p> |
