公开(公告)号：US11929640B2

公开(公告)日：2024-03-12

申请号：US17022918

申请日：2020-09-16

Applicant: Seiko Instruments Inc.

Inventor： Kosuke Yamamoto ,  Shinji Kinoshita ,  Hitoshi Takeuchi ,  Tatsuya Omura

IPC: H02K1/14 ,  G04C3/14 ,  H02K15/02 ,  H02K37/16 ,  G04C3/12

CPC classification number: H02K1/143 ,  G04C3/14 ,  H02K15/022 ,  H02K37/16 ,  G04C3/12

Abstract: A stator includes a magnetic plate material that has a main plate surface that is a surface to face a main plate of a movement when assembled to the main plate and that has a rotor accommodating hole formed in a part thereof; and a non-magnetic region that is made non-magnetic by applying chromium on the main plate surface around the rotor accommodating hole and irradiating the chromium with a laser from the main plate surface side.