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:
Apr. 09, 2013
Filed:
Nov. 28, 2007
Pierre Gygax, Cortaillod, CH;
Marc-andre Glassey, Bramois, CH;
Pierre Gygax, Cortaillod, CH;
Marc-Andre Glassey, Bramois, CH;
Abstract
The invention relates to a mechanical oscillator, in particular for watchmaking, comprising a spiral spring () having a number N of turns, a central end (), an eccentric end () and a rotary collet (), connected to the central end (), comprising an orifice intended to receive an arbor for rotation about an axis (A), and a balance (), the axis of rotation of which coincides with the rotation arbor (A), the eccentric end () being intended to be integral with a stationary element of the 'balance-cock' type, said spiral spring () being made up of a single-crystal silicon (Si) core () and at least one peripheral coating () based on a material having a thermoelastic coefficient different from that of silicon, the single-crystal silicon (Si) being oriented along the crystallographic axis {1,1,1} to optimize the temperature coefficient of the mechanical oscillator as a whole. In addition, this invention likewise relates to a method of designing said mechanical oscillator, consisting in optimizing the temperature coefficient of the complete oscillator in order to limit its thermal drift.