Temperature-compensated balance wheel/hairspring oscillator
AssigneeCSEM Centre Suisse d'Electronique et de Microtechniques SA — Recherche et Développement
InventorClaude Bourgeois
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Abstract
The invention relates to mechanical watch oscillators comprising an assembly consisting of a spiral and a temperature compensated balance. The spiral is embodied in a quartz substrate whose section is selected in such a way that the drifts of the spiral and of the balance associated therewith are thermally compensated. The substrate section can be embodied in the form of a section of single or double rotation.
Claims7
A mechanical oscillator comprising a hairspring and a balance wheel, the hairspring having turns and an end for connection to a stud and being produced in a quartz substrate, the cut of which is a double ZY/φ/θ rotation cut, wherein θ has a value between −24° and +24° that provides a double rotation cut so that the first-order thermal coefficient α of the rigidity of said hairspring compensates for the thermal drift of the balance wheel with which it is associated, and wherein φ is the longitude and θ is the inclination of the hairspring axis to the optical axis Z of the crystal.
Dependencies are inferred from the claim text.