Resonator with matched balance spring and balance
US9030920B2 · kind B2 · utility
2Cited by
1References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 28, 2013 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Aug 28, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B17/066
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A resonator includes a balance spring formed in a single crystal quartz with crystallographic axes x, y, z, where the x axis is an electrical axis and the y axis is a mechanical axis, and cooperating with a balance. A thermal expansion coefficient of the balance is comprised between +6 ppm.° C.−1 and +9.9 ppm.° C.−1 and a cut angle of the balance spring to the z axis of the single crystal quartz is comprised between −5° and +5°, so as to match the balance to the balance spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.