Solar-powered electronic timepiece
US9019802B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 2012 |
| Grant date | Apr 28, 2015 |
| Priority date | — |
| Expiry date | Apr 10, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C10/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The solar battery includes a plurality of cells having a same electromotive force with each other. The display device further includes a display means to display time, and a control means to control operation of the display means. The electromotive force of the solar battery is lower than a deterioration-start voltage of the rechargeable battery. The electromotive force of the cells is higher than a lower-limit driving voltage of the display device, in which a number of such cells equals a total number of cells include in the solar battery minus one. A driving voltage of the display means is lower than the aforementioned lower-limit driving voltage, and an operational voltage of the control means is lower than the aforementioned lower-limit driving voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.