Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1985-03-01
1987-01-13
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313R, 310313D, 333153, 330 55, 331107A, H01L 4108
Patent
active
046366784
ABSTRACT:
Compensation for the effects of environmentally caused changes and aging on piezoelectric acoustic wave devices is electrically provided by the application of a signal, such as a DC bias voltage, to the finger elements of an interdigital transducer formed on the surface of the acoustic wave device. This produces very large field concentrations at the finger edges which act to magnify the electric field and accordingly the electroacoustic effect which alters the acoustic velocity of surface acoustic waves, shallow bulk acoustic waves and reflected bulk acoustic waves propagating in a piezoelectric substrate between input and output interdigital transducers.
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patent: 3675054 (1972-07-01), Jones et al.
patent: 3717819 (1973-02-01), Adler
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"Doubly Rotated Thickness Mode Plate Vibrators", A. Ballato, Physical Acoics, vol. 13, Academic Press, N.Y., 1977, p. 153, Polarizing Effect described.
"Piezoelectric Resonators", A. Ballato, Design of Crystal and Other Harmonic Oscillators, John Wiley & Sons, 1983, pp. 113-114, Frequency shift described.
"Shallow Bulk Acoustic Wave Progress and Prospects", A. Ballato, IEEE Trans. Microwave Theory Tech., vol. MTT-27, Dec. 1979, pp. 1004-1012, FIG. 9 discloses FIG. 2 of application.
Budd Mark O.
Karnars Sheldon
Murray Jeremiah G.
Rehberg John T.
The United States of America as represented by the Secretary of
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