Vibration control apparatus having automatic gain control

Details Vibration control apparatus having automatic gain control Vibration control apparatus having automatic gain control

1995-01-10

1996-09-10

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310315, 310317, 310318, H01L 41107

Patent

active

055549047

ABSTRACT:
A vibration control apparatus that can impart stabilized self-induced vibration without amplitude changes even under changes in ambient temperature is disclosed. When the apparatus is used with a vibrating gyroscope, detection accuracy is increased without temperature dependence of detection sensitivity on input angular velocity. The vibration control apparatus imparts self-induced vibration to a vibrator which has a pair of piezo-electric elements on the side surface of a vibration member having a resonance point. The vibrator is given self-induced vibration while the combined current value of the respective currents flowing through the pair of piezo-electric elements is held fixed. A drive signal output circuit outputs a drive signal applied to the pair of piezoelectric elements and has a voltage gain with a temperature dependence corresponding to the temperature dependencies of the equivalent resistances of the vibrator. The automatic gain control circuit holds the combined current value of the currents flowing through the pair of piezo-electric elements fixed. The drive signal output circuit may have a voltage gain contrary to the temperature dependencies of equivalent resistances of the vibrator.

REFERENCES:
patent: 4479098 (1984-10-01), Watson
patent: 4714846 (1987-12-01), Pesque et al.
patent: 5349857 (1994-09-01), Kasanami et al.
patent: 5426970 (1995-06-01), Florida et al.
patent: 5434467 (1995-07-01), Abe et al.

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