Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1977-08-05
1979-10-09
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310800, H01L 4110
Patent
active
041707427
ABSTRACT:
An electro-acoustic transducer comprising a flexible film of piezoelectric material, at least one electrode provided on one side of said film amd 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: 3976897 (1976-08-01), Tamura
patent: 3978353 (1976-08-01), Kinoshita
patent: 4008408 (1977-02-01), Kodama
patent: 4051395 (1977-09-01), Taylor
patent: 4056742 (1977-11-01), Tibbetts
Itagaki Tadasi
Iwama Kiyonori
Yoshimi Toshikazu
Budd Mark O.
Pioneer Electronic Corporation
Tokorozawa Electronic Corporation
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