Method for maintaining oscillations of a vibrating device and vibrating device using same
US6894618B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2000 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Jan 21, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G13/021
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is disclosed a method for maintaining the oscillations of a vibrating device and a vibrating device implementing this method. The vibrating device is intended to be fitted to a unit worn close to the body, such as a timepiece, including a case, a moving mass inside this case intended to transmit vibrations thereto, a coil (L) electromagnetically coupled to said moving mass in order to make it vibrate, and an excitation circuit for exciting said coil CL). According to the method disclosed, driving pulses (21, 22) of alternate polarity and determined duration (Tpulse) substantially coinciding with the extrema of the movement induced voltage (Uind, VB12) across the terminals (B1, B2) of said coil (L) are generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.