The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 2005
Filed:
Dec. 05, 2000
Sergio Rota, Neuchâtel, CH;
Stéphane Künzi, Cormondrèche, CH;
Sergio Rota, Neuchâtel, CH;
Stéphane Künzi, Cormondrèche, CH;
ETA SA Manufacture Horlogere Suisse, Grenchen, CH;
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 () of alternate polarity and determined duration (T) substantially coinciding with the extrema of the movement induced voltage (U, V) across the terminals (B, B) of said coil (L) are generated.