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:
Dec. 01, 2009
Filed:
Jul. 18, 2008
Silvio Dalla Piazza, St-Imier, CH;
Bruno Studer, Riedholz, CH;
Felix Staub, Koppigen, CH;
ETA SA Manufacture Horlogère Suisse, Grenchen, CH;
Abstract
The tuning fork resonator () includes a base () from which first and second parallel vibrating arms () extend, carrying a set of excitation electrodes () for vibrating the arms at a fundamental frequency. Grooves () are formed on at least one of the top or bottom surfaces of each of said arms. The vibrating arms have a generally tapered shape, and are extended by an enlarged flipper shaped portion () which forms the free end of each arm. The groove () is extended in the direction of the free end of an arm to beyond the start of the flipper () so as to increase said first motional capacitance of the resonator for the fundamental frequency, to decrease said second motional capacitance of the resonator for the partial frequency and to ensure better distribution of mechanical stress along the vibrating arms and to increase shock resistance.