Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1981-12-03
1985-02-26
Miller, J. D.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333151, 333154, H03H 925
Patent
active
045019878
ABSTRACT:
A surface acoustic wave transducer has a multilayered substrate which is made of a nonpiezoelectric plate which has a surface which is coated with a piezoelectric film, and has an interdigital electrode which is disposed on or under the surface of the piezoelectric film. The interdigital electrode has a split structure and the phase velocity of the surface acoustic wave of the piezoelectric film is smaller than that of the nonpiezoelectric plate.
REFERENCES:
patent: 3987376 (1976-10-01), Kerbel
patent: 4229506 (1980-10-01), Nishiyama et al.
patent: 4247835 (1981-01-01), Lewis
patent: 4354130 (1982-10-01), Ono et al.
Moulic et al., "SAW Harmonic Responce Cancellation Technique," IBM Tech. Disclosure, vol. 18, No. 2, Jul. 1975.
Matthews, H., Ed., Surface Wave Filters, Wiley, NY, 1977, pp. 30-43.
Inaba Ritsuo
Mitsuyu Tsuneo
Ono Shusuke
Wasa Kiyotaka
Matsushita Electric - Industrial Co., Ltd.
Miller J. D.
Rebsch D. L.
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