| 摘要 |
<p>A mechanical timepiece, comprising a movement (300) including a movement barrel (120), a second wheel (124), a third wheel (126), a fourth wheel (128), a timed annular balance (140), an escape wheel (130), and a pallet fork (142), coils (180a, 180b) being installed on the front surface of a main plate (102) so that these coils face the main plate side surface of an annular balance wheel (140b), a balance magnet (140e) being installed on the main plate side surface of the annular balance wheel (140b) so that the balance magnet (140e) faces the front surface of the main plate (102) , and additionally comprising a timed annular balance rotation detecting part (176) installed for detecting the swing angle of the timed annular balance by detecting, using light, the operating condition of the timed annular balance (140), a posture detecting part (361) for detecting the posture of the mechanical timepiece, and a braking part (146) formed so that a force to suppress the rotation of the timed annular balance (140) is applied to the timed annular balance (140) based on the signals concerning the posture of the mechanical timepiece detected by the posture detecting part (361) when the swing angle of the timed annular balance (140) detected by the timed annular balance rotation detection part (176) is equal to or more than a pre-set angle.</p> |
