An electronic watch includes a driver controlled to be in an ON state in which a drive current is supplied to a coil of a moter and an OFF state in which the drive current is not supplied to the coil, a target current value setter configured to set a target current value in accordance with a drive voltage for driving the motor, and a driver controller configured to compare a detected current value of a current flowing to the coil with the target current value, control the driver to be in the ON state or the OFF state in accordance with a result of the comparison, and switch polarity of the drive current when detecting that an ON time, which is a duration of the ON state of the driver, meets a predetermined condition or an OFF time, which is a duration of the OFF state of the driver, meets a predetermined condition.

An electronic watch includes a driver controlled to be in an ON state in which a drive current is supplied to a coil of a motor and an OFF state in which the drive current is not supplied to the coil, a target current value setter configured to set a target current value in accordance with a drive voltage for driving the motor, and a driver controller configured to compare a detected current value of a current flowing to the coil with the target current value, control the driver to be in the ON state or the OFF state in accordance with a result of the comparison, and switch polarity of the drive current when detecting that an ON time, which is a duration of the ON state of the driver, meets a predetermined condition or an OFF time, which is a duration of the OFF state of the driver, meets a predetermined condition.

An electronic timepiece includes a power generator that generates electric energy, a power storage that stores the electric energy, a capacity detector that detects remaining capacity of the power storage, an operation unit, an operation detector that detects a measurement display operation for instructing the operation unit to display a measurement time, and a capacity display operation for instructing the operation unit to display the remaining capacity, an indicating hand that is used in displaying the measurement time and the remaining capacity, a drive unit that drives the indicating hand, and displays the remaining capacity after moving the indicating hand so as to indicate a preset reference position.

The conventional demand target display device based on time information differing from the information used by electric power companies and electric power consumers causes a divergence regarding their demand values. Therefore, a demand target display device with a dual-purpose scale, which acquires AC signals based on the AC waveform of AC power from a power supply line, generates time information based on the acquired AC signals, transmits the generated time information via radio waves within a housing, receives the transmitted time information via radio waves within the housing, indicates the time on the dual-purpose scale based on the received information, acquires electrical energy consumption within a segment for a given target demand value including the current time, and indicates the relationship between the acquired electrical energy consumption within a segment recorded and a target demand value set for such segment, is proposed.

A method for uniquely identifying a timepiece includes, during a timepiece identification period: accessing a library of heartbeat profiles, associated with a population of verified timepieces, defined prior to the timepiece identification period; at a timepiece maintenance station, triggering a probe to contact an unverified timepiece arranged within the timepiece maintenance station; at a vibration sensor coupled to the probe, capturing a vibration signal representing vibrations generated by a movement of the unverified timepiece; extracting a timeseries of periodic characteristics from the vibration signal; and, in response to the timeseries of periodic characteristics approximating periodic characteristics represented in a power reserve range within a heartbeat profile, in the library of heartbeat profiles, identifying the unverified timepiece as a verified timepiece specified for the heartbeat profile.