Title:
HAIRSPRING AND SPEED REGULATOR
Document Type and Number:
WIPO Patent Application WO/2019/202967
Kind Code:
A1
Abstract:
This hairspring comprises SiO2 and Al2O3 in amounts of 60-70 mass% and 10-15 mass%, respectively, and comprises glass that substantially does not comprise an alkali metal oxide. Furthermore, the glass preferably comprises CaO in an amount of 5 mass% or more. Furthermore, the glass preferably substantially does not comprise ZnO. The hairspring preferably has a coefficient of thermal expansion of no less than 3.0 × 10-6/K and less than 4.0 × 10-6/K.
Inventors:
ABE YOSUKE (JP)
NIIDA YUSAKU (JP)
NIIDA YUSAKU (JP)
Application Number:
PCT/JP2019/014570
Publication Date:
October 24, 2019
Filing Date:
April 02, 2019
Export Citation:
Assignee:
CITIZEN WATCH CO LTD (JP)
International Classes:
G04B17/06; G04B17/22
Foreign References:
| JP2016069274A | 2016-05-09 | |||
| JP2007533973A | 2007-11-22 | |||
| JP2016191711A | 2016-11-10 | |||
| JPH07291660A | 1995-11-07 |
Attorney, Agent or Firm:
TORANOMON INTELLECTUAL PROPERTY FIRM (JP)
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