Piezoelectric vibratory gyroscope utilizing an energy-trapping v

Details Piezoelectric vibratory gyroscope utilizing an energy-trapping v Piezoelectric vibratory gyroscope utilizing an energy-trapping v

1998-12-21

2000-10-31

Kwok, Helen

Measuring and testing

Speed, velocity, or acceleration

Angular rate using gyroscopic or coriolis effect

7350404, 310320, 310366, G01P 904

Patent

active

061385107

ABSTRACT:
A piezoelectric vibratory gyroscope utilizing an energy-trapping vibration mode comprises a piezo-electric plate having a principal surface and polarized in a thickness direction, and first through n-th electrodes (n being an integer not smaller than three) formed in a generally central area of the principal surface at positions corresponding to first through n-th vertexes of a polygon having n angles. When the piezoelectric plate is excited in the energy-trapping vibration mode of a primary vibration, rotation of the piezoelectric plate around an axis perpendicular to the principal surface of said piezoelectric plate produces the Coriolis force to excite a secondary vibration which induces electric voltages at the first through the n-th electrodes. A voltage difference is detected for at least two of the first through the n-th electrodes.

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Electronics & Communications in Japan, Part II-Electronics, vol. 79, No. 7, Jul., 1996, pp. 30-39, K. Nakamura, Elastic Wave Enery-Trapping and its Application to Piezoelectrc Devices.

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