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 ...

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 power generated by a power generating means (1) of a power-generating type electronic clock is measured by a first power generating sensing means (101) and a second power generating sensing means (102). The power generation level required when the operation is changed from a normal mode to a power-saving mode and the power generation level required when the operation is changed from the power-saving mode back to the normal mode are made different to prevent the phenomenon that the operation ...

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...

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...

The present invention concerns a portable object such as a timepiece (18) capable of being worn on a user's wrist by means of a wristband, this portable object being supplied with electric power by at least one rechargeable accumulator able to be recharged by induction charging means, these inductive charging means including a primary winding (56) and a secondary winding (2), said portable object being characterised in that the secondary winding (2) is housed in a strand (16, 26) of the wristban...

An electronic timepiece with a solar cell includes a timepiece movement, a timepiece case for housing the timepiece movement, a casing ring for housing and holding the timepiece movement in the timepiece case, a solar cell and a dial. The solar cell is disposed almost vertically to a solar cell positioning portion provided in the casing ring, and the solar cell has a slender strip shape formed on a flexible substrate. Consequently, the solar cell is not disposed in the timepiece movement, and it...

A timepiece having basic timepiece pointers, chronograph information pointers, a mechanical energy storage section, a train wheel, a power generator, and a control section. The basic timepiece pointers are rotated to indicate the standard time. The chronograph information pointers are rotated to indicate chronograph information. The mechanical energy storage section includes a mainspring. The train wheel is disposed between the mechanical energy storage section and the pointers, and transmits en...

There is disclosed a wristwatch having a case containing a mechanical watch movement (10) driven by a spring barrel (14) and provided with a mechanical regulator with a balance and balance-spring, which is associated, via electromagnetic coupling, with an electronic regulator driven by a quartz resonator. The rim of the balance (13) is provided with a pair of permanent magnets (38, 39). The electronic regulator includes a fixed coil (12) arranged for cooperating with said magnets via electromagn...

A starter which applies a mechanical rotating force to a rotor of an electromagnetic converter, such as a power generator, for startup of the rotor. The starter includes a startup spring (60) having an engaging portion (63) engageable with a 6th pinion (11a) of a wheel train coupled to the power generator. In interlock with the operation of pulling out a crown, a reset lever (70) is operated to bias the startup spring for engagement with the 6th pinion. Thereafter, the startup spring is released...