Title:
MECHANICAL TIMEPIECE
Document Type and Number:
WIPO Patent Application WO/2022/176453
Kind Code:
A1
Abstract:
This mechanical timepiece (1) uses an electromagnetic means for rate adjustment and efficiently extracts electric power. The mechanical timepiece (1) comprises a balance wheel (31), a hairspring (32), a permanent magnet (41), a soft magnetic core (42), a control circuit (44) for carrying out rate adjustment on the basis of a reference frequency of a reference signal source and counter-electromotive voltage produced in a coil (43) as a result of the movement of the permanent magnet (41) accompanying the forward motion and reverse motion of the balance wheel (31), a rectifier circuit (50) for rectifying the current produced in the coil (43) as a result of the movement of the permanent magnet (41) accompanying the forward motion and reverse motion of the balance wheel (31), and a power supply circuit (60) for driving the control circuit (44) on the basis of the current rectified by the rectifier circuit (50). The permanent magnet (41) is disposed such that the magnetization direction thereof faces the side of a first end part (421a) or second end part (422a) in a state where the hairspring (32) is in a neutral elastic deformation position.
Inventors:
TAKYO YU (JP)
NIIDA YUSAKU (JP)
SHIRAI TAKUYA (JP)
ABE YOSUKE (JP)
NIIDA YUSAKU (JP)
SHIRAI TAKUYA (JP)
ABE YOSUKE (JP)
Application Number:
PCT/JP2022/000922
Publication Date:
August 25, 2022
Filing Date:
January 13, 2022
Export Citation:
Assignee:
CITIZEN WATCH CO LTD (JP)
International Classes:
G04B17/00; G04B18/02; G04B31/02; G04C3/04; G04C10/00
Foreign References:
| JP2020038206A | 2020-03-12 | |||
| JP2013509576A | 2013-03-14 | |||
| JPS4998280A | 1974-09-17 | |||
| JP2018159598A | 2018-10-11 | |||
| JP2020038206A | 2020-03-12 | |||
| JP2019113548A | 2019-07-11 |
Attorney, Agent or Firm:
HARUKA PATENT & TRADEMARK ATTORNEYS (JP)
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