Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1995-12-26
1998-07-21
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
G01C 1956, H01L 41107
Patent
active
057838976
ABSTRACT:
A vibrating gyroscope in which harmonic components can be removed relatively easily and which can detect a rotational angular velocity accurately. The vibrating gyroscope 10 comprises a vibrator 12 in which detecting pieces 16a and 16b and a driving piece 16c are created on sides of a vibrating member 14, inverting amplifier circuits 24 and 26 for amplifying output signals of the detecting pieces 16a and 16b, a comparator circuit 32 for shaping waveform of output signals of the inverting amplifier circuits 24 and 26, a phase compensating circuit 34 for adjusting a phase of the output signal of the comparator circuit 32 and for feeding the output signal back to the driving piece 16c to stably vibrate the vibrating member, a differential circuit 38 for finding a difference of the output signals of the inverting amplifier circuits 24 and 26 and a synchronous detector circuit 40 for detecting the output signal of the differential circuit 38 in synchronism with the signal of the comparator circuit 32.
REFERENCES:
patent: 5349857 (1994-09-01), Kasanami et al.
patent: 5375336 (1994-12-01), Nokamura
patent: 5412204 (1995-05-01), Nakamura
patent: 5473288 (1995-12-01), Kumada
patent: 5495759 (1996-03-01), Nakamura
patent: 5505085 (1996-04-01), Kasanami et al.
Dougherty Thomas M.
Murata Manufacturing Co. Ltd.
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