Movement And Electronic Timepiece
AssigneeSeiko Epson Corporation
InventorTakashi KAWAGUCHI
Life of this patent
Estimating the term…
Abstract
A movement includes a driver having ON and OFF states, and outputting a drive signal to a coil of a motor, a lower limit detector detecting that a current flowing through the coil is less than a lower limit, a drive controller bringing the driver into the ON state based on a result of the lower limit detector, and bringing the driver into the OFF state based on an elapsed time from the ON state, a polarity switcher switching a polarity of the drive signal when an elapsed time from the OFF state of the driver satisfies a switching condition, and a drive stopper stopping driving of the driver when the OFF time satisfies a stopping condition.
Claims20
A movement comprising:
- a motor having a coil;
- a driver that has an ON state and an OFF state, and outputs a drive signal to the coil so as to drive the motor;
- a lower limit detector that detects that a current flowing through the coil is less than a lower limit;
- a drive controller that brings the driver into the ON state based on a detection result in the lower limit detector, and brings the driver into the OFF state based on an elapsed time from the driver being brought into the ON state;
- a polarity switcher that switches a polarity of the drive signal when an OFF time satisfies a polarity switching condition, the OFF time being an elapsed time from the driver being brought into the OFF state;
- and
- a drive stopper that stops driving of the driver when the OFF time satisfies a drive stopping condition.
A movement comprising:
- a driver that has an ON state and an OFF state, and outputs a drive signal to a coil of a motor so as to drive the motor;
- a lower limit detector that detects that a current flowing through the coil is less than a lower limit;
- a drive controller that brings the driver into the ON state based on a detection result in the lower limit detector, and brings the driver into the OFF state based on an elapsed time from the driver being brought into the ON state;
- a polarity switcher that switches a polarity of the drive signal when an OFF time satisfies a polarity switching condition, the OFF time being an elapsed time from the driver being brought into the OFF state;
- and
- a drive stopper that stops driving of the driver when an elapsed time from a time of starting to drive the driver or a time of switching the polarity satisfies a drive stopping condition.
A movement comprising:
- a motor having a coil;
- a driver that has an ON state and an OFF state, and outputs a drive signal to the coil so as to drive the motor;
- an upper limit detector that detects that a current flowing through the coil is more than an upper limit;
- a drive controller that brings the driver into the OFF state based on a detection result in the upper limit detector, and brings the driver into the ON state based on an elapsed time from the driver being brought into the OFF state;
- a polarity switcher that switches a polarity of the drive signal when an ON time satisfies a polarity switching condition, the ON time being an elapsed time from the driver being brought into the ON state;
- and
- a drive stopper that stops driving of the driver when the ON time satisfies a drive stopping condition.
Dependencies are inferred from the claim text.