公开(公告)号：US10539927B2

公开(公告)日：2020-01-21

申请号：US16135535

申请日：2018-09-19

Applicant: Seiko Instruments Inc.

Inventor： Akihito Okumura ,  Ryosuke Isogai ,  Kosuke Yamamoto

IPC: G04C3/14 ,  G04C10/00 ,  H02P8/02

Abstract: A timepiece includes a voltage detection unit that detects a voltage applied to a stepping motor for driving an indicating hand, and that outputs a voltage detection result, and a drive control unit that controls a rotor to perform reverse rotation by using a reverse rotation pulse including a first pulse whose polarity is the same as that of a normal rotation pulse for causing the rotor of the stepping motor to perform normal rotation, a second pulse whose polarity is reverse to that of the first pulse, and a third pulse whose polarity is reverse to that of the second pulse, and to control the rotor to perform the reverse rotation by using the third pulse having a pulse width set in accordance with the voltage detection result.