Manufacture Et Fabrique De Montres Et Chronometres Ulysse Nardin Le Locle Sa

Sigatec Sa

Manufacture Et Fabrique De Montres Et De Chronomètres Ulysse Nardin Le Locle S.a.

Pierre Gygax

Lucas Humair

Stephane Von Gunten

Stéphane Von Gunten

Marc-Andre Glassey

Loïc Pellaton

Michel Vermot

Marc-André Glassey

Romain Nagel

Stéphane Von Guntenn

Loïc Pellation

Sandrine Benz

A spiral spring () for the movement of a watch, includes a plurality of coplanar leaves () wound into one another. Furthermore, the inner ends of each leaf are rigidly connected to a single collet (). The leaves () and the collar () are produced as a single part.

Spiral spring

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.

Mechanical oscillator having an optimized thermoelastic coefficient

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Cortaillod, Switzerland

Pierre Gygax