| 摘要 |
A tuning-fork sensor is formed with a piezoelectric single crystal and its drive arm 101 is self-excitedly vibrated by an oscillation circuit at a resonance frequency f0 in a predetermined direction. A sensor arm 102 also vibrates in the same direction in synchronization with the drive arm, and forcibly vibrates in the direction orthogonal to the direction of the vibration at the same frequency as f0 by a Coriolis force induced by the rotation. First sensor electrodes of the sensor arm are connected to a ground wire, a positive-input terminal of an operational amplifier forming a sensor circuit is connected to the ground wire, second sensor electrodes and a negative-input terminal are connected to each other, and the negative-input terminal and an output terminal are connected to each other through a feedback resistor 33.
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