Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1985-05-02
1988-02-16
Kyle, Deborah L.
Communications, electrical: acoustic wave systems and devices
Signal transducers
367164, 367160, 310334, 310800, H04R 1700, H01L 4108
Patent
active
047259949
ABSTRACT:
An ultrasonic transducer includes a piezoelectric polymer film folded as at least two layers and having electrodes on both the surfaces thereof. The ultrasonic transducer is responsive to a signal, applied across electrodes, to produce an ultrasonic wave to be focused at one spot so that it is converted to an electric signal. In this ultrasonic transducer, a groove or through holes are formed on and along the folded area of the piezoelectric polymer film.
REFERENCES:
patent: 3074327 (1963-01-01), Grahn
patent: 3177382 (1965-04-01), Green
patent: 4028566 (1977-06-01), Franssen et al.
patent: 4032929 (1977-06-01), Fischbeck et al.
patent: 4205248 (1980-05-01), Negita
patent: 4322877 (1982-04-01), Taylor
patent: 4330730 (1982-05-01), Kurz et al.
patent: 4376302 (1983-03-01), Miller
patent: 4469978 (1984-09-01), Hamada et al.
Patent Abstracts of Japan, vol. 9, No. 185 (E-332) [1908], 31st Jul. 1985; & JP-A-60 54 599 (Toshiba K. K.) 29.03.1985.
Patent Abstracts of Japan, vol. 5, No. 109 (E-65) [781], 15th Jul. 1981; & JP-A-56 47 199 (Toray K. K.) 28-04-1981.
Kaneko Nagao
Nakamura Nanao
Kabushiki Kaisha Toshiba
Kyle Deborah L.
Steinberger Brian S.
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