Measuring and testing – Speed – velocity – or acceleration – Angular rate using gyroscopic or coriolis effect
Patent
1998-09-03
2000-02-15
Williams, Hezron
Measuring and testing
Speed, velocity, or acceleration
Angular rate using gyroscopic or coriolis effect
7350414, 310316, 310329, G01P 900, H01L 4108
Patent
active
060239735
ABSTRACT:
A vibrating gyroscope includes a columnar vibrator, a driver and a detector. The columnar vibrator includes first and second piezoelectric substrates polarized in mutually opposite directions along the thickness directions thereof and stacked with each other. Two divided electrodes are formed on one main surface of the first piezoelectric substrate and spaced in the direction perpendicular to the longitudinal direction of the first piezoelectric substrate, and a common electrode is formed on one main surface of the second piezoelectric substrate. The driver drives the vibrator in the thickness direction of the first and second piezoelectric substrates and is connected between the divided electrodes and the common electrode. The detector detects a displacement caused by bending vibration of the vibrator, and is connected to the divided electrodes. The vibrator has substantially the same resonant frequency in the two diagonal directions which diagonally connect four edges elongating in the longitudinal direction of the vibrator.
REFERENCES:
patent: 5430342 (1995-07-01), Watson
patent: 5635786 (1997-06-01), Fujimoto et al.
patent: 5765046 (1998-06-01), Watanabe et al.
Ishitoko Nobuyuki
Morita Katsuhiko
Takenaka Michihiko
Tatsumi Tetsuo
Yabe Toru
Kwok Helen C.
Murata Manufacturing Co. Ltd.
Williams Hezron
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