Tuning-fork vibratory gyro and sensor system using the same
First Claim
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1. A vibratory gyro comprising:
- a tuning-fork vibrator having a piezoelectric member; and
a supporting member supporting the tuning-fork vibrator, said tuning-fork vibrator having a driving-side vibration mode and a detection-side vibration mode different from said driving-side vibration mode,wherein said tuning-fork vibrator comprises;
first and second arms;
detection electrodes provided only on the first arm;
driving electrodes provided only on the second arm; and
a ground electrode provided on the second arm such that the driving electrodes are in a floating state with respect to the ground electrode,said tuning-fork vibrator resonating in the driving-side vibration mode, and both said tuning-fork vibrator and said supporting member resonating together as a unit in the detection-side vibration mode.
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Abstract
A vibratory gyro includes a tuning-fork vibrator having a piezoelectric member, and a supporting member supporting the tuning-fork vibrator. The tuning-fork vibrator has a driving-side vibration and a detection-side vibration. The turning-fork vibrator resonates in the driving-side vibration, and the turning-fork vibrator and the supporting member resonate as a whole in the detection-side vibration.
44 Citations
18 Claims
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1. A vibratory gyro comprising:
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a tuning-fork vibrator having a piezoelectric member; and a supporting member supporting the tuning-fork vibrator, said tuning-fork vibrator having a driving-side vibration mode and a detection-side vibration mode different from said driving-side vibration mode, wherein said tuning-fork vibrator comprises; first and second arms; detection electrodes provided only on the first arm; driving electrodes provided only on the second arm; and a ground electrode provided on the second arm such that the driving electrodes are in a floating state with respect to the ground electrode, said tuning-fork vibrator resonating in the driving-side vibration mode, and both said tuning-fork vibrator and said supporting member resonating together as a unit in the detection-side vibration mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A sensor system comprising:
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a vibratory gyro; a driving circuit which drives the vibratory gyro; and a detector circuit which detects an output signal output from the vibratory gyro, said vibratory gyro comprising; a tuning-fork vibrator having first and second arms and a piezoelectric member; detection electrodes provided only on the first arm; driving electrodes provided only on the second arm;
a around electrode provided on the second arm such that the driving electrodes are in a floating state with respect to the ground electrode; anda supporting member supporting the tuning-fork vibrator, said tuning-fork vibrator having a driving-side vibration mode and a detection-side vibration mode different from said driving side vibration mode, said tuning-fork vibrator resonating in the driving-side vibration mode, and both said tuning-fork vibrator and said supporting member resonating together as a unit in the detection-side vibration mode.
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Specification