| 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 makes one round of oscillators in series. CONSTITUTION:Driving coils 14 and 14A are arranged under a couple of legs 11 and 11A and coils 14 and 14A are connected in series to flow an AC current. At this time, one of oscillation mass parts 11-1 and 11-1A of both legs 11 and 11A becomes an N pole and the other becomes an S pole at every half cycle of the AC current, so that they receives mutually attracting forces. Therefore, both legs attract each other twice in every cycle of the AC current, so a tuning fork 1 oscilates at a frequency twice as high as that of an AC power source 16. At this time, oscillations of both legs 11A and 11 are detected by oscillation detectors 1l8 and 18A and angular oscillations of the inflection shaft 3 of the tuning fork 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 attracting force between both legs 11 and 11A, so that variation in scale factor and deviation in zero point corresponding to variations in the voltage and frequency of the power source are prevented or reduced greatly. |
