Electronic timepiece
US4085577A · kind A · utility
8Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1976 |
| Grant date | Apr 25, 1978 |
| Priority date | — |
| Expiry date | Jul 1, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/912
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic timepiece is driven by a pulse motor and includes a pulse motor driving circuit which applies frequency-divided pulses for maintaining the rotational inertia of a rotor. The revolutions of the pulse motor are detected as is the load on the motor. In addition, the revolutions of the pulse motor are periodically compared with the number of driving pulse. A second hand of the electronic timepiece is continuously rotated by the pulse motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.