| 摘要 |
PURPOSE:To obtain an output signal of a detecting section which develops no undesired Y-axis low frequency vibration during the rotation of a sensor, by adjusting dimensions of parts of a tuning fork so as to set the Y-axis natural frequency higher than the X-axis drive frequency. CONSTITUTION:Piezo-electric plates 8 and 8' are driving are lined on the sides of detecting sections 2 and 2' of a tuning fork type vibrator 1. Then, when an AC voltage is applied between drive electrodes 8a and 8a' and 8b and 8b' separately, the detecting sections 2 and 2' to develop bending vibration in the X-axis. When a rotary angular velocity OMEGA is given around the Z-axis together with the X-axis drive at the same frequency as the X-axis natural frequency, the detecting sections 2 and 2' also to generate bending vibration in the Y-axis. On the other hand, the vibrator 1 is so formed that the X-axis natural frequency becomes less than the Y-axis natural frequency. With such an arrangement, in an output waveform after passing through a bandpass filter of a sensor, the difference V-Vc is proportional to the angular velocity OMEGA as obtained between the amplitude Vc with the sensor at rest and the amplitude V when a fixed angular velocity is given. As only the drive frequency is developed in the waveform, the angular velocity signal is demodulated easily with a detector. |
