Electronic timepiece
US6646960B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 2001 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Apr 20, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C10/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic timepiece comprises power generation means for generating electricity by using external energy, storage means for storing electric energy received from the power generation means, time-indicating means powered by electric energy supplied from the power generation means or the storage means for indicating time, a switch circuit including a plurality of switching devices and adapted to transfer or intercept electric energy between the power generation means and the storage means and between the power generation means and the time-indicating means, voltage measuring means for measuring voltage across the time-indicating means, and control means that selects one of predetermined power ratios based on the results of measurement by the voltage measuring means and controls the switch circuit according to the selected ratio when the power generation means charges the storage means and the time-indicating means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.