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AssigneeSony Corporation
InventorKazuo Kurihara
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Vibration gyro circuitry, a vibration gyro unit, and a method for detecting a vibration gyro output, which enable detection of a rotational angular velocity with high sensitivity, are provided. The circuitry and the unit includes a differential amplifier circuit (4) for outputting a signal Vda corresponding to a difference (Vgl−Vgr) between output signals of two detection pieces of a vibration gyro (31), a synchronous detection circuit (5) for synchronously detecting the output signal Vda of the differential amplifier circuit (4), and a phase shift circuit for supplying to the synchronous detection circuit (5) a signal, as a timing signal Vck for the synchronous detection, which is phase-shifted with respect to a drive signal (an output signal of an adding circuit 1) Vsa supplied to the vibration gyro (31). The phase difference θps between the drive signal Vsa and the timing signal Vck is set on the basis of a phase difference characteristic of a detection sensitivity S for the output signal Vda of the differential amplifier circuit (4), which is obtained in advance under a condition where a rotational angular velocity is applied to the vibration gyro (31) in a driving state.
Vibration gyro circuitry comprising:
A vibration gyro unit comprising:
A method for detecting a vibration gyro output, in which synchronous detection is performed on a signal corresponding to a difference between output signals of two detection pieces of a vibration gyro, using a timing signal which is phase-shifted with respect to a drive signal supplied to the vibration gyro, so that a rotational angular velocity applied to the vibration gyro is detected, wherein the phase difference between the drive signal and the timing signal is set on the basis of a phase difference characteristic of a detection sensitivity for the signal corresponding to the difference between the output signals of the detection pieces, and the synchronous detection is performed using the timing signal which is phase-shifted by the set phase difference with respect to the drive signal.
Dependencies are inferred from the claim text.