Thermoregulated sprung balance resonator
US7503688B2 · kind B2 · utility
6Cited by
5References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 20, 2004 |
| Grant date | Mar 17, 2009 |
| Priority date | — |
| Expiry date | Mar 18, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B17/222
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.