An electronic timepiece, including: a counter; a display section; a first processor; a second processor; and a power supply section which supplies electric power to each section from a battery, wherein when an output voltage from the power supply section decreases to less than a predetermined first reference voltage, the first processor stops a display operation by the display section, when the time information is acquired by the processing operation of the second processor, the first processor corrects the time counted by the counter based on the acquired time information and causes the display section to display the corrected time, and when the output voltage decreases to less than the first reference voltage following an acquisition operation of the time information by the second processor, the first processor does not stop a time display operation during a predetermined pending period.

An electronic timepiece, including: a counter; a display section; a first processor; a second processor; and a power supply section which supplies electric power to each section from a battery, wherein when an output voltage from the power supply section decreases to less than a predetermined first reference voltage, the first processor stops a display operation by the display section, when the time information is acquired by the processing operation of the second processor, the first processor corrects the time counted by the counter based on the acquired time information and causes the display section to display the corrected time, and when the output voltage decreases to less than the first reference voltage following an acquisition operation of the time information by the second processor, the first processor does not stop a time display operation during a predetermined pending period.

A human motion energy harvesting apparatus embeddable in a wearable electronic device is provided. The apparatus may include a base; a first rotor disposed in a ring shape and connected to the base, the first rotor being rotatable circumferentially relative to the base, wherein a plurality of pairs of first permanent magnets may be disposed on a surface of the first rotor; an oscillating weight fixed coaxially with the first rotor; a second rotor disposed in a ring shape and coaxially connected to the base with the first rotor, the second rotor being rotatable circumferentially relative to the base, wherein a plurality of pairs of second permanent magnets may be disposed on a surface of the second rotor; a modulation ring fixed to the base coaxially with the first rotor between the first rotor and the second rotor; and a stator fixed to the base coaxially with the first rotor on a side of the second rotor opposite the first rotor, wherein a coil is arranged on the stator.

An energy box includes a container, and an electric power generation device housed therewithin. The electric power generation device includes a number of thin-film based thermoelectric modules, each of which is less than or equal to 100 m in dimensional thickness and includes pairs of N-type thermoelectric legs and P-type thermoelectric legs electrically in contact with one another on a flexible substrate, a number of hot plates, and a number of cold plates. The each thin-film based thermoelectric module further includes a first surface and a second surface in surface contact with a hot plate and a cold plate respectively to form the electric power generation device. The energy box is configured to generate electric power at utility scale through the electric power generation device based on a temperature difference maintained between the first surface and the second surface of the each thin-film based thermoelectric module.

A stator includes a magnetic body having a through-hole, a magnetoresistive portion disposed around the through-hole to generate a magnetic pole around the through-hole in a case where a coil is excited, and a non-magnetic portion disposed at a position different from a position of the magnetoresistive portion around the through-hole by means of thermal melting, and formed to have lower magnetic permeability than the magnetic body.

Provided is an electromechanical transducer to be detachably attached to an electronic device, the transducer including: first and second plates; a rotor rotating around a rotating shaft supported by the plates; a fixed substrate disposed between the plates and facing the rotor; a charged portion having sub-regions disposed on the rotor at intervals in a rotating direction thereof so as to face the fixed substrate; an opposing electrode disposed on the fixed substrate so as to face the rotor; an adjusting unit for adjusting sliding properties of the rotating shaft, the adjusting unit being provided for at least one of the plates; and a gear train coupled to the rotating shaft. The gear train transmits motive power generated by the rotor rotated by electric power of the electronic device to the electronic device or transmits motive power generated by a change in orientation of the electronic device to the rotor.

Provided is an electromechanical transducer to be detachably attached to an electronic device, the transducer including: first and second plates; a rotor rotating around a rotating shaft supported by the plates; a fixed substrate disposed between the plates and facing the rotor; a charged portion having sub-regions disposed on the rotor at intervals in a rotating direction thereof so as to face the fixed substrate; an opposing electrode disposed on the fixed substrate so as to face the rotor; an adjusting unit for adjusting sliding properties of the rotating shaft, the adjusting unit being provided for at least one of the plates; and a gear train coupled to the rotating shaft. The gear train transmits motive power generated by the rotor rotated by electric power of the electronic device to the electronic device or transmits motive power generated by a change in orientation of the electronic device to the rotor.

A power generation system includes a power generation unit, a power storage unit, and a voltage step-down unit. The power generation unit includes a generation main body having an electrification film and a counter electrode rotating relative to each other to generate power, and an energy generator generating energy for rotating the electrification film and the counter electrode. The power storage unit stores output power of the power generation unit. The voltage step-down unit is electrically connected to the power generation unit and the power storage unit and reduces output voltage of the power generation unit to a step-down voltage. The step-down voltage obtained by dividing the most energy-efficiently generated output voltage of the power generation unit by a step-down ratio of the voltage step-down unit coincides with storage voltage corresponding to a region between first and second turning points on a discharge curve of the power storage unit.

A power generation system includes a power generation unit, a power storage unit, and a voltage step-down unit. The power generation unit includes a generation main body having an electrification film and a counter electrode rotating relative to each other to generate power, and an energy generator generating energy for rotating the electrification film and the counter electrode. The power storage unit stores output power of the power generation unit. The voltage step-down unit is electrically connected to the power generation unit and the power storage unit and reduces output voltage of the power generation unit to a step-down voltage. The step-down voltage obtained by dividing the most energy-efficiently generated output voltage of the power generation unit by a step-down ratio of the voltage step-down unit coincides with storage voltage corresponding to a region between first and second turning points on a discharge curve of the power storage unit.

A watch including a case containing a plate and an electronic module powered by a button cell battery, a conductor electrically connecting the button cell battery to the electronic module and a clamping device capable of ensuring an electrical connection between the button cell battery and the conductor, wherein the clamping device includes a magnet.