Tag Heuer Sa

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

Marc-Andre Glassey

Pierre Gygax

Thomas Houlon

Stephane Linder

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

The invention relates to a chronograph watch with a display with a first retrograde hand for indicating the tenths of a second of the chronograph and a second retrograde hand for displaying the hundredths of a second of the chronograph. The hours, minutes and seconds are displayed by corresponding hands at the center of the dial.

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Bramois, Switzerland

Marc-Andre Glassey