Back to results
US 10,539,926 B2Granted
Balance spring made of heavily doped silicon for a timepiece
AssigneeRolex SA
InventorsRichard Bossart, Olivier Hunziker
Life of this patent
Estimating the term…
Abstract
A balance spring for an oscillator of a timepiece, wherein it comprises a component part, in particular at least a coil or a portion of a coil, provided with heavily doped silicon having an ion density greater than or equal to 1018 at/cm3, in order to permit the thermo-compensation of the oscillator.
Claims20
A balance spring for an oscillator of a timepiece, comprising:
- a component part that is a coil or a portion of the coil provided with heavily doped silicon,
- wherein the component part includes a cross section varying locally over a length of the component part, and the variation in the cross section is implemented by a reduction in at least one of a thickness and a height of the component part of the balance spring in first zones,
- wherein the first zones of the component part of the balance spring coincide with places where a tangent to a neutral fiber is substantially in alignment with a direction <100> of a monocrystal constituting the balance spring, and
- wherein the heavily doped silicon has an ion density greater than or equal to 1018 at/cm3,
- in order to permit thermo-compensation of the oscillator.
2 more elements
Dependencies are inferred from the claim text.