| 摘要 |
PURPOSE:To enable prevention of a change in a zero point due to an angular velocity signal of a large amplitude by smoothing an output voltage of a phase detector and by inputting it then to an amplifier. CONSTITUTION:The amplitude of a voltage impressed on a drive element 101 is controlled by a first amplifier 1 amplifying a surface charge of a monitor element 102, a rectifier 2 rectifying a first output voltage, a smoothing circuit 3 smoothing an output voltage of the rectifier 2 and a second amplifier 4, and thereby the vibration of a tuning fork is turned to be definite. In the surface electrodes of first and second detecting elements 103 and 104, a charge is generated in accordance with an angular velocity impressed thereon, and amplified by a third amplifier 5. Next, it is phase-detected with a period of the vibration of the tuning fork by a phase detector 6 and turned into a voltage proportional to the angular velocity, and this voltage is DC-amplified by a DC amplifier 8 and outputted as an angular velocity voltage output. This output voltage and a ground voltage are inputted to and smoothed by a low-pass filter 10 and an output voltage thereof is made to be a plus input voltage of the amplifier 8. Thereby a zero point of the angular velocity voltage output is always made to be equal to the ground voltage. |
