Electronic watch
US4382691A · kind A · utility
12Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1980 |
| Grant date | May 10, 1983 |
| Priority date | — |
| Expiry date | Jul 16, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C3/143
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an analog electronic watch having a calendar display the power required during change of the calendar display, about 6 hours out of 24, is greater than at other times. In order to effect economy in power consumption, the pulse for driving the watch motor during the time other than the period in which the calendar display is being changed is only sufficient to drive the time indicating means. In case the motor fails to step when such pulse is applied, this is detected by a detecting circuit and a corrective drive pulse is applied to the motor so as to drive it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.