Self-compensating spiral spring for a mechanical balance-spiral spring oscillator
US6705601B2 · kind B2 · utility
6Cited by
4References
4Claims
0Family size
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Key dates
| Filing date | May 6, 2002 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | May 8, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B17/227
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This self-compensating spiral spring for a mechanical balance-spiral spring oscillator for a watch or clock movement or other precision instrument, made of an Nb—Hf paramagnetic alloy possessing a thermal coefficient of Young's modulus (TCE), such that it enables the following expression to be substantially equal to zero: where:E: Young's modulus of the spiral spring of the oscillator; &agr;s: thermal expansion coefficient of the spiral spring of the oscillator;&agr;b: thermal expansion coefficient of the balance the oscillator.contains between 2 at % and 30 at % Hf.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.