An electronic timepiece includes: a main unit having a reporting unit that reports information to a user; a crown that can be pulled out from and pushed back into a main unit by the user; a sensor that detects a state of the electronic timepiece; and a processor, wherein the processor detects a state of the crown and the state detected by the sensor and switches between a plurality of modes in accordance with the state of the crown, and wherein upon detecting that the crown has been pulled out or pushed back in, the processor causes the electronic timepiece to operate in a state reporting mode in which the reporting unit reports the state detected by the sensor to the user.

There is provided a control device that includes a processor and an energy harvesting unit. The processor acquires an electricity consumption amount necessary for execution of a predetermined function of the processor and an amount of energy harvested by the energy harvesting unit, and determines whether or not to execute the predetermined function based on the electricity consumption amount, the amount of energy harvested that are acquired.

There is provided a control device that includes a processor and an energy harvesting unit. The processor acquires an electricity consumption amount necessary for execution of a predetermined function of the processor and an amount of energy harvested by the energy harvesting unit, and determines whether or not to execute the predetermined function based on the electricity consumption amount, the amount of energy harvested that are acquired.

A watch includes a chargeable power supply, a crystal oscillation circuit including a crystal oscillator and an oscillation circuit and configured to stop oscillating when a power supply voltage falls below an oscillation stop voltage and to start oscillating when the power supply voltage exceeds an oscillation start voltage, which is higher than the oscillation stop voltage, and a divider circuit that outputs a reference signal by dividing an oscillation signal output from the oscillation circuit. The watch also includes a temperature compensation circuit that performs a temperature compensation function operation that compensates for variation of the reference signal due to a temperature, a first voltage detection circuit that detects that the power supply voltage exceeded a first voltage that is set higher than the oscillation start voltage, and a control circuit that starts the temperature compensation function operation of the temperature compensation circuit when the first voltage detection circuit detects that the power supply voltage exceeded the first voltage, and subsequently continues the temperature compensation function operation even when the power supply voltage falls below the first voltage.

An analog electronic watch includes watch's internal time, and controls rotation of a group of indicators based on the watch's internal time. A terminal appliance stops the rotation of the group of indicators, generates an image of the indicators and the dial plate with an imaging unit, detects current display positions of the group of indicators in identification areas as part of the image of the indicators and the dial plate, generates current display time information based on the current display positions, and generates display time correction information based on a difference between the current display time information and the watch's internal time information. The analog electronic watch corrects the display positions of the group of indicators based on the display time correction information. There are provided an analog electronic watch system and an analog electronic watch that can reduce a time required for display time correction.

An electronic timepiece includes a secondary battery, a first power feeder, a second power feeder, and a processor. The first power feeder feeds power to the secondary battery. The second power feeder feeds power to the secondary battery at a current larger than a current fed by the first power feeder. The processor determines remaining power of the secondary battery based on different references that are a reference of when the first power feeder is feeding the power to the secondary battery and a reference of when the second power feeder is feeding the power to the secondary battery.

A power indicator device (1) of a thermoelectric generator of a watch. The indicator device includes a first gas fluid reservoir (2), a second gas fluid reservoir (3), and at least one tubular conduit (4) connecting the two reservoirs. The first reservoir is placed on an upper surface of the thermoelectric generator in a watch case, while the second reservoir (3) is placed on a lower surface of the thermoelectric generator in contact with the back of a watch case. The tubular conduit is of the capillary type and comprises in an intermediate portion (9) a liquid forming a barrier to the gas fluid of the two reservoirs and allowing, in a display portion (24) visible from the outside of the watch case, to provide an indication of the power of the generator by measuring the temperature difference of the two reservoirs.

A power indicator device (1) of a thermoelectric generator of a watch. The indicator device includes a first gas fluid reservoir (2), a second gas fluid reservoir (3), and at least one tubular conduit (4) connecting the two reservoirs. The first reservoir is placed on an upper surface of the thermoelectric generator in a watch case, while the second reservoir (3) is placed on a lower surface of the thermoelectric generator in contact with the back of a watch case. The tubular conduit is of the capillary type and comprises in an intermediate portion (9) a liquid forming a barrier to the gas fluid of the two reservoirs and allowing, in a display portion (24) visible from the outside of the watch case, to provide an indication of the power of the generator by measuring the temperature difference of the two reservoirs.

An electronic watch comprising a timekeeper logic unit (42) set to control a display (50,54) of the time, and a controller (48), in communication with an external device (90) or with internet (99) through a wireless interface (68) of the watch, and a mechanical energy harvester system (25) set to transform mechanical energy deriving from the movements of a wearer to electrical energy, a power manager circuit for storing the electrical energy in a battery (30) and/or in a capacitor (32), and to supply the logic unit (42), the controller (48) and the wireless interface (68) with energy stored in the battery (30) and/or in the capacitor (32).

An electronic watch comprising a timekeeper logic unit (42) set to control a display (50,54) of the time, and a controller (48), in communication with an external device (90) or with internet (99) through a wireless interface (68) of the watch, and a mechanical energy harvester system (25) set to transform mechanical energy deriving from the movements of a wearer to electrical energy, a power manager circuit for storing the electrical energy in a battery (30) and/or in a capacitor (32), and to supply the logic unit (42), the controller (48) and the wireless interface (68) with energy stored in the battery (30) and/or in the capacitor (32).