STEPPMOTOR FOR ELECTRONIC WATCH

摘要

PURPOSE:To always ensure the reversion of the step-motor for the electronic watch by varying the fixed pulse duration of the reversing pulse formed by plural number of pulses in accordance with the variation of the battery voltage. CONSTITUTION:The rotor of step-motor 58 stops at the position of the fixed angle after turning forward and then reverses by the 1st pulse of the plural number of pulses formed by oscillator circuit 51, divider circuit 52 and waveform compounding circuit 53 each. And the duration of the forward turning pulse varies according to the battery voltage and via voltage detector circuit 55 and reverse pulse duration selection circuit 56. As a result, the reverse turning can always be ensured for the step-motor.