Title:
Resonator with matched balance spring and balance
Document Type and Number:
Japanese Patent JP6328392
Kind Code:
B2
Abstract:
The resonator (1) has a balance spring (5) formed in a single crystal quartz with three crystallographic axes, where the first and second axes are electrical axis and mechanical axis, respectively. The thermal expansion coefficient of a balance (3) lies between + 6 part per million degree Celsius -1 and + 9.9 part per million degree Celsius -1. Cut angle ranging between - 5 degree and + 5 degree is formed between the balance spring and the third axis of the single crystal quartz such that the resonator is less sensitive to temperature variation. A portion of the balance is made of titanium, platinum or durimphy.
Inventors:
Thierry Esle
Application Number:
JP2013182787A
Publication Date:
May 23, 2018
Filing Date:
September 04, 2013
Export Citation:
Assignee:
The Swatch Group Research and Development Limited
International Classes:
G04B17/22; G04B17/06
Domestic Patent References:
| JP2005106819A |
Foreign References:
| US20100034057 |
Attorney, Agent or Firm:
Masaki Yamakawa
Shigeki Yamakawa
Shigeki Yamakawa
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