Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1980-12-12
1983-08-16
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310337, 367164, H01L 4108
Patent
active
043993877
ABSTRACT:
An ultrasonic wave transducer capable of generating a convergent ultrasonic sound beam has been found. The transducer comprises a piezoelectric substrate, at least one interdigital electrode group arranged on the surface of the piezoelectric substrate, each of said groups having a plurality of interdigital electrodes arranged in the longitudinal direction of the fingers of each interdigital electrode, said substrate being positioned in a liquid so that at least said interdigital electrodes contact with the liquid, and said electrodes being applied an alternating voltage with a predetermined phase difference thus providing a convergent sound beam in y-direction based upon the principle of interference between the sound beams, similar to the interference by a diffraction grating. Further, the non-uniform arrangement of the fingers of the interdigital electrodes provides the x-direction convergence, thus, an ultrasonic wave beam focusing at a single point is obtained.
REFERENCES:
patent: 2875355 (1959-02-01), Petermann
patent: 3086195 (1963-04-01), Halliday
patent: 3166731 (1965-01-01), Joy
patent: 3401360 (1968-09-01), Schulz-De Bois
patent: 3745812 (1973-07-01), Korpel
patent: 3875550 (1975-04-01), Quate et al.
patent: 3962673 (1976-06-01), Desbois
patent: 4034332 (1977-07-01), Alais
patent: 4075516 (1978-02-01), Mattori et al.
Budd Mark O.
Collard Allison C.
Galgano Thomas M.
TDK Electronics Co. Ltd.
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