| 摘要 |
PROBLEM TO BE SOLVED: To enable a more stable rotation and achieve reduced power consumption by more accurately determining rotation state and performing appropriate pulse control. SOLUTION: A control circuit includes a rotation detection circuit 110 and a controller. The rotation detection circuit detects whether an induced signal VRs generated by rotation of a stepping motor 105 has exceeded a predetermined reference threshold voltage Vcomp in a detection interval T having a plurality of detection areas. The controller determines a rotation state of the stepping motor 105 based on a pattern indicating whether the induced signal VRs exceeds the reference threshold voltage Vcomp in each detection area. The controller controls drive of the stepping motor 105 by any of a plurality of main drive pulses P1 having differing energy levels or a correction drive pulse P2 having a greater energy level than each of the main pulses P1, based on the determined results. An invalid area Ts is provided between at least two detection areas. The controller determines the rotation state of the stepping motor 105 without taking into consideration the induced signal VRs generated in the invalid area Ts. COPYRIGHT: (C)2011,JPO&INPIT |
