Device for the maintenance and control of the oscillations of the balance wheel of a timepiece
US3965667A · kind A · utility
1Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1974 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Jul 9, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C3/068
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for maintaining constant the amplitude of the oscillation of an electro-magnetically driven balance wheel of a timepiece, whereby a first voltage is generated of an amplitude proportional to the amplitude of oscillation of the wheel. This is compared with a reference voltage and a signal is derived corresponding in amplitude and sign with the difference. This signal is then used to control the application of driving pulses to the balance wheel. The said driving pulses are preferably much shorter than one half-period of the balance wheel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.