Electronic watch
US6061304A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1998 |
| Grant date | May 9, 2000 |
| Priority date | — |
| Expiry date | Mar 31, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C10/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic watch is provided with an electric power generator for generating electric energy by external energy, electric power charger for charging the electric energy generated by the electric power generator, a watch driving system comprising a watch driving circuit and a time display sub-system, operated by electric energy supplied by the electric power charger, a stored electric power detector for detecting an amount of electric energy charged in the electric power charger, and a controller. Operation of at least the time display sub-system of the watch driving system is suspended when the amount of electric energy stored as detected by the stored electric power detector falls below a preset standard value, and thereafter, operation of the suspended portion of the watch driving system is resumed upon detecting conditions for reactivation, such operation being continued at least for a period when preset conditions are met. Thus, when the electronic watch is put to use again after it is left unused for a long time, the watch driving system does not come to a stop immediately after resumption of operation of time display, ensuring stable display of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.