Oscillatory angular speed detecting apparatus
First Claim
1. An oscillatory angular velocity detecting apparatus, comprising:
- a pillar-shaped oscillator body;
means for applying a drive signal to a transducer mounted to a first side surface of the oscillator body, said transducer comprising means for applying a driving force to said oscillator body;
means, mounted to a second side surface substantially perpendicular to the first side surface of the oscillator body, i) for producing a first readout signal when no rotational force is added to the oscillator body and ii) for producing a second readout signal when a rotational force is added to the oscillator body;
phase detecting means, i) for a first comparison of the respective first and second readout signals with the drive signal to obtain first and second compared readout signals, and ii) for a second comparison between the respective phases of the first and second compared readout signals to obtain a first DC angular signal having a voltage level;
means for conducting amplitude detection by comparison between amplitudes of the first readout signal and the second readout signal to obtain a second DC angular signal having a voltage level; and
means for deriving a strength value and a direction value, respectively, of angular velocity from the voltage level of the first DC angular signal.
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Abstract
An oscillatory angular speed detecting apparatus is disclosed which includes a pillar-shaped oscillator body and drive and readout piezoelectric transducers attached to first, second, and third surfaces of the oscillator body, the first side surface being perpendicular to the second side surface and the third side surface being parallel to the first side surface, in which vibration of the oscillator body is transduced into a readout signal by the readout transducer. A phase detecting device detects variations of phases of the readout signals, and an amplitude detecting device detects variations of amplitudes of the readout signals, and the angular speed is detected from the phases detected by the phase detecting device and/or the amplitude detected by the amplitude detecting device.
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Citations
9 Claims
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1. An oscillatory angular velocity detecting apparatus, comprising:
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a pillar-shaped oscillator body; means for applying a drive signal to a transducer mounted to a first side surface of the oscillator body, said transducer comprising means for applying a driving force to said oscillator body; means, mounted to a second side surface substantially perpendicular to the first side surface of the oscillator body, i) for producing a first readout signal when no rotational force is added to the oscillator body and ii) for producing a second readout signal when a rotational force is added to the oscillator body; phase detecting means, i) for a first comparison of the respective first and second readout signals with the drive signal to obtain first and second compared readout signals, and ii) for a second comparison between the respective phases of the first and second compared readout signals to obtain a first DC angular signal having a voltage level; means for conducting amplitude detection by comparison between amplitudes of the first readout signal and the second readout signal to obtain a second DC angular signal having a voltage level; and means for deriving a strength value and a direction value, respectively, of angular velocity from the voltage level of the first DC angular signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An oscillatory angular velocity detecting apparatus, comprising:
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a pillar-shaped oscillator body; means for applying a fixed-reference-voltage-stabilized drive signal to a piezoelectric transducer mounted to a first side surface of the oscillator body, said transducer comprising means for applying a driving force to said oscillator body; means, mounted to a second side surface substantially perpendicular to the first side surface of the oscillator body, i) for producing a first readout signal when no rotational force is added to the oscillator body and ii) for producing a second readout signal when a rotational force is added to the oscillator body; phase detecting means, i) for a first comparison of the respective first and second readout signals with the drive signal to obtain respective first and second compared readout signals, and ii) for a second comparison between the respective phases of the first and second compared readout signals to obtain a first DC angular signal having a voltage level; means for conducting amplitude detection by comparison between amplitudes of the first readout signal and the second readout signal to obtain a second DC angular signal having a voltage level; and means for deriving a strength value and a direction value, respectively, of angular velocity from the voltage level of the first DC angular signal.
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Specification