Piezoelectric electro-acoustic transducer

Details Piezoelectric electro-acoustic transducer Piezoelectric electro-acoustic transducer

1975-07-14

1977-08-30

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310366, H01L 4104

Patent

active

040456951

ABSTRACT:
An electro-acoustic transducer comprising a flexible film of piezoelectric material, at least one electrode provided on one side of said film and a plurality of electrodes provided on the other side of said film to form a piezoelectric diaphragm and said piezoelectric diaphragm is imparted with a locally differing resiliency and/or tension, is provided. By using this piezoelectric electro-acoustic transducer in a loudspeaker, it is possible to improve acoustic characteristics thereof particularly in a high frequency range, to obtain a variety of acoustic characteristics and to effect motional feed back to minimize distortion of reproduced sound without involving any difficulty in manufacturing or affecting proper performance of the transducer.

REFERENCES:
patent: 3638052 (1972-01-01), Massa
patent: 3745384 (1973-07-01), Blanchard
patent: 3777192 (1973-12-01), Barrow
patent: 3792204 (1974-02-01), Murayama et al.
patent: 3798473 (1974-03-01), Murayama et al.
patent: 3832580 (1974-08-01), Yamamuro et al.
patent: 3976897 (1976-08-01), Tamura et al.
patent: 3978353 (1976-08-01), Kinoshita
Electroacoustic Transducers with Piezoelectric High Polymer Films, JAES, Jan./Feb. 1975, vol. 23, No. 1, pp. 21-26 (effective date is 9-10-74 presentation before AES).

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