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US 7,503,688 B2Granted
Thermoregulated sprung balance resonator
AssigneeAsulab S.A.
InventorsThierry Hessler, Rudolf Dinger
Life of this patent
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Abstract
The balance-spring is structured by photolithography and etching in a strip pre-cut from a quartz monocrystal such that the height h of the coils form, with the crystallographic axis z, an angle θ for adapting the thermal behaviour of the balance-spring to that of the balance, thereby reducing the variation of rate due to temperature variations.
Claims5
A sprung balance resonator for a mechanical watch movement including a balance-spring with an elasticity constant C and a balance with a moment of inertia I, wherein the balance-spring is formed of coils of height h made from a strip of a single quartz monocrystal, and
- wherein the quartz is in crystallised form along crystallographic axes x y z, axis x being the electrical axis and y the mechanical axis.
Dependencies are inferred from the claim text.