公开(公告)号：US20190086873A1

公开(公告)日：2019-03-21

申请号：US16135535

申请日：2018-09-19

Applicant: Seiko Instruments Inc.

Inventor： Akihito OKUMURA ,  Ryosuke ISOGAI ,  Kosuke YAMAMOTO

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

CPC classification number: G04C3/143 ,  G04C3/146 ,  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.

公开(公告)号：US20200225619A1

公开(公告)日：2020-07-16

申请号：US16734873

申请日：2020-01-06

Applicant: Seiko Instruments Inc,.

Inventor： Kosuke YAMAMOTO ,  Shinji KINOSHITA ,  Ryosuke ISOGAI

IPC: G04C3/14 ,  H02K37/14 ,  H02K1/02 ,  H02K15/02

Abstract: A stator includes a magnetic body having a through-hole, a magnetoresistive portion disposed around the through-hole to generate a magnetic pole around the through-hole in a case where a coil is excited, and a non-magnetic portion disposed at a position different from a position of the magnetoresistive portion around the through-hole by means of thermal melting, and formed to have lower magnetic permeability than the magnetic body.