Electronic watch
US4084404A · kind A · utility
1Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1976 |
| Grant date | Apr 18, 1978 |
| Priority date | — |
| Expiry date | Dec 23, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C10/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A frequency divider divides a sonic or ultrasonic time base frequency to provide signals with a frequency of N/60 Hz, where N is a whole number comprised between 1 and 16. These signals drive a motor step-by-step, the motor in turn driving minutes and hours hands by one step per pulse. A liquid crystal supplied with a signal of optically perceptible frequency of about 1 Hz can be added, providing a flashing optical display enabling verification of running of the watch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.