The invention concerns a synchronisation method between analogue display means (4, 6) and a volatile time counter (8) in a multi-function electronic watch when the primary powering means (18) powering said watch are replaced, including the following steps, (i) calculating a value (Vtps) representative of a time information item by means of the time base (14) of the watch; (ii) storing the value in the volatile time counter; (iii) updating the value in the volatile time counter periodically as a ...

An electronic timepiece (10) comprises time information generating unit (A) for generating time information, information generating unit for generating information (function information, warning information, etc.) other than the time information, and power-saving operation unit (D) for operating the electronic timepiece in a power-saving operation state entailing lower power consumption than in a normal operation state. The information generating unit or the power-saving operation unit (D) is op...

When a stem switch (8) is pulled out, a switch signal forming unit 9 outputs a signal (RS) indicating that effect, a control unit (13) receives the signal (RS) and starts clocking by a timer (13a). The control unit (13) receives a signal (HS) output from an electricity-generation detecting unit (12) within the clocking period, detects the electricity generating operation of an electricity generating unit (10), and outputs a signal (CS) indicating that effect. A narrow pulse forming unit (7) form...

Residual battery capacity is calculated in an electronic apparatus having an ultrasonic motor driven by a battery based on the revolution speed of the ultrasonic motor. This permits residual capacity to be calculated extremely close to actual battery life with a simplified circuit structure. An electronic watch having an ultrasonic motor as a driving source of a calendar display mechanism is provided with a residual battery capacity display device having a revolution speed detector for detecting...

A power reserve mechanism has a ratchet wheel having a winding stem, a first winding stem train wheel connected to the winding stem of the ratchet wheel and having a first power reserve wheel, and a barrel member having a winding stem. A spring member is mounted in the barrel member. A second winding stem train wheel independent from the first winding stem train wheel is connected to the winding stem of the barrel member and has a second power reserve wheel. A first indicator is disposed on the ...

A timepiece has a mainspring winding state display apparatus for arranging a rotational center of a winding mark hand at an arbitrary pertinent position in a movement of the timeplace. The movement has a barrel complete and a speed reducing mechanism cooperatively moved with a barrel gear of the barrel complete for reducing a speed of ratotion of the barrel gear. A segment gear undergoes rotation in accordance with an output of the barrel gear. A winding mark indicator undergoes rotation in acco...

The invention concerns a timepiece including a mechanical power source (1) coupled, on the one hand, to first means (5) displaying time related information and, on the other hand, to a generator (2), a regulator circuit (6) for enslaving the generator frequency to a reference frequency, said regulator circuit including switching means (7) arranged for electrically braking the generator when the generator frequency is higher than the reference frequency, and second power-reserve display means (12...

The wrist watch comprises essentially a battery (10), two electric motors (11, 12) which moves the hands (13, 14, 15) on the one hand and a disk of dates (16) on the other hand, an electronic circuit (23) and a watch-type microprocessor (22). When there is a determination by the electronic circuit (23) of the end of the life of the battery, the microprocessor powers the motor (12) in such a manner that the date displayed in the window (17) of the watch is displaced with respect to its normal pos...

Power reserve indicator mechanism for a timepiece movement of the type provided with a power source formed of a motor spring (26), including a frame (10, 12, 14, 16), a power reserve indicator and a differential gear (30) with a first input (44) connected to a wheel (29) driven in rotation when the motor spring is wound, a second input (42) connected to a wheel (20) driven in rotation when the motor spring is let down, and an output (36a) connected to said indicator, wherein the indicator is cap...

An electronic timepiece includes a time counter (19) for counting time reference signals, a calendar hand moving device (20) for moving hands in accordance with the count content of the time counter, a cover open/close switch (15) for sensing opening/closing of a timepiece cover and time information setting means for setting time calendar information when the timepiece cover is opened. The time counter (19) is constituted so that it counts the time reference signals by using the time information...