Patent ID: 11929640
Assignee: SEIKO INSTRUMENTS INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 4:
5. A timepiece movement comprising:
a stator plate having a first surface and a second surface opposite to the first surface, wherein the stator plate is made with magnetic material and has a circular hole for accommodating a rotor in the circular hole;
two non-magnetic regions formed in the stator plate around the circular hole at a 180-degree interval between the circular hole and respective peripheries of the stator plate adjacent to the circular hole, wherein the two non-magnetic regions are made mainly of chromium heat-diffused into the stator plate from the first surface thereof in such a manner that the two non-magnetic regions each have a width that becomes progressively narrower from the first surface of the stator plate toward the second surface thereof, and the two non-magnetic regions each have a chromium bulge protruding from the first surface of the stator plate away from the first surface; and
a main plate in which at least one recessed space is formed, wherein the stator plate is fixed onto the main plate so that the first surface of the stator plate faces the main plate, and the bulges of the two non-magnetic regions are accommodated in the at least one recessed space formed in the main plate.