MECHANICAL TIMEPIECE
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United States of America Patent
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Issued Date -
Apr 18, 2024
app pub date -
Jan 13, 2022
filing date -
Feb 17, 2021
priority date (Note) -
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Abstract
A mechanical timepiece includes: a hairspring; a permanent magnet; a soft magnetic core; a control circuit for performing rate adjustment based on a counter-electromotive voltage caused in a coil by a motion of the permanent magnet accompanying a forward direction motion and a reverse direction motion of the balance wheel. The permanent magnet is arranged so that, under a state in which the hairspring is brought to an equilibrium length, a direction of magnetization is directed to the first end portion side or the second end portion side.
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