Oscillation gyro and an inspection apparatus therefor
First Claim
1. A vibration gyro comprising:
- an oscillator;
a plurality of piezoelectric units for oscillating said oscillator in a predetermined driving-axis direction, each of the piezoelectric units having a common electrode in common with each of the other piezoelectric units, a noncommon electrode, and a resistive component;
piezoelectric unit driving means for driving said plurality of piezoelectric units by supplying an electric power signal to said common electrode of said plurality of piezoelectric units;
a plurality of current-voltage converting means each for converting a current output from the noncommon electrode of one of said plurality of piezoelectric units to a voltage and outputting said voltage as a converted signal;
eliminating means for eliminating damping components of the currents output from said plurality of piezoelectric units by amplifying by a predetermined amplification factor said electric power signal supplied from said piezoelectric unit driving means, altering by a predetermined angle a phase of the amplified electric power signal, dividing the amplified electric power signal having the altered phase, and supplying the divided signals to said plurality of current-voltage converting means;
adding means for adding the converted signals output from said plurality of current-voltage converting means and feeding back an added value to each of said plurality of current-voltage converting means, thereby decreasing the amplitude of said converted signals; and
error calculating means for calculating a difference between the outputs of said plurality of current-voltage converting means and outputting a signal representing said difference, wherein the difference signal indicates an angular velocity of said oscillator.
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Abstract
A vibration gyro which comprises an oscillator; a plurality of piezoelectric units for oscillating the oscillator in a predetermined driving-axis direction; piezoelectric unit driving means for driving the plurality of piezoelectric units by supplying an electric power to a common electrode of the plurality of piezoelectric units; a plurality of current-voltage converting means each for converting a current outputted from each of noncommon electrodes of the plurality of piezoelectric units to a voltage; eliminating means for eliminating damping components of the plurality of piezoelectric units by amplifying an output of the piezoelectric unit driving means by a predetermined amplification factor, shifting a phase of an amplified signal by a predetermined angle, shunting the amplified signal, and supplying each of shunted signals to each of the plurality of current-voltage converting means; adding means for adding outputs of the plurality of current-voltage converting means and for feeding back an added value respectively to the plurality of the current-voltage converting means; and error calculating means for calculating a difference between the outputs of the plurality of current-voltage converting means.
16 Citations
8 Claims
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1. A vibration gyro comprising:
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an oscillator; a plurality of piezoelectric units for oscillating said oscillator in a predetermined driving-axis direction, each of the piezoelectric units having a common electrode in common with each of the other piezoelectric units, a noncommon electrode, and a resistive component; piezoelectric unit driving means for driving said plurality of piezoelectric units by supplying an electric power signal to said common electrode of said plurality of piezoelectric units; a plurality of current-voltage converting means each for converting a current output from the noncommon electrode of one of said plurality of piezoelectric units to a voltage and outputting said voltage as a converted signal; eliminating means for eliminating damping components of the currents output from said plurality of piezoelectric units by amplifying by a predetermined amplification factor said electric power signal supplied from said piezoelectric unit driving means, altering by a predetermined angle a phase of the amplified electric power signal, dividing the amplified electric power signal having the altered phase, and supplying the divided signals to said plurality of current-voltage converting means; adding means for adding the converted signals output from said plurality of current-voltage converting means and feeding back an added value to each of said plurality of current-voltage converting means, thereby decreasing the amplitude of said converted signals; and error calculating means for calculating a difference between the outputs of said plurality of current-voltage converting means and outputting a signal representing said difference, wherein the difference signal indicates an angular velocity of said oscillator. - View Dependent Claims (2, 3, 4)
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5. A vibration gyro comprising:
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an oscillator; a plurality of piezoelectric units for oscillating said oscillator in a predetermined driving-axis direction, each of the piezoelectric units having a common electrode in common with each of the other piezoelectric units, a noncommon electrode, and a resistive component; piezoelectric unit driving means for driving said plurality of piezoelectric units by supplying an electric power signal to said common electrode of said plurality of piezoelectric units; a plurality of current-voltage converting means each for converting a current output from the noncommon electrode of one of said plurality of piezoelectric units to a voltage and outputting said voltage as a converted signal; eliminating means for eliminating damping components of the currents output from said plurality of piezoelectric units by amplifying by a predetermined amplification factor said electric power signal supplied from said piezoelectric unit driving means, altering by a predetermined angle a phase of the amplified electric power signal, dividing the amplified electric power signal having the altered phase, and supplying the divided signals to said plurality of current-voltage converting means; error calculating means for calculating a difference between the outputs of said plurality of current-voltage converting means and outputting a signal representing said difference; synchronism sampling means for outputting a synchronism signal in synchronism with a resistance error signal caused by an error due to said resistance components of said plurality of piezoelectric units based on the converted signals output from said plurality of current-voltage converting means; and synchronism detecting means connected to said error calculating means for detecting said signal output from said error calculating means based on said synchronism signal and outputting a detected signal, wherein said detected signal indicates an angular velocity of the oscillator. - View Dependent Claims (6, 7, 8)
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Specification