| 摘要 |
PURPOSE:To prevent variation in scale factor and deviation in zero point by arranging a driving coil so that a magnetic field produced with an AC current becomes parallel to an input axis Z-Z. CONSTITUTION:When the AC current is flowed from a driving power source 16 to the driving coil 14, a center magnetic field coincides with the axis Z-Z. Then, both leg parts 11A and 11 of a tuning fork 1 are induced in every half cycle with the produced magnetic field to the same polarity S or N, so they generate repulsive forces. Thus, a repulsive force is generated twice in every AC cycle, so the tuning fork 1 oscillates at a frequency twice as high as that of the power source 16. Oscillations of both legs 11A and 11 are detected by oscillation detectors 18 and 18A and angular oscillations of the inflection shaft 3 of the tuning force 1 is rectified synchronously on the basis of the detection outputs to detect an angular speed OMEGA. The driving force which causes the tuning fork 1 to oscillate is only the repulsive forces of the legs 11 and 11A and does not relate to the position of the coil 14. Therefore, variation in scale factor and deviation in zero point corresponding to variations in the voltage and frequency of the power source 16 are prevented or reduced greatly. |
