发明名称 |
Method for manufacturing a balance hairspring for a clockwork and hairspring obtained thereby. |
摘要 |
Hair spring (1) is subjected to first general heat treatment and then a second heat treatment at 510-550 degrees Centigrade which is restricted to the outer spiral (16) and transition zone (28) up to an angle of 140 degrees from the outer fixing (20). A second heat treatment may be conveniently applied by laser beam.
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申请公布号 |
EP0911707(A1) |
申请公布日期 |
1999.04.28 |
申请号 |
EP19970118332 |
申请日期 |
1997.10.22 |
申请人 |
ETA SA FABRIQUES D'EBAUCHES |
发明人 |
MARMY, PHILIPPE;FAVRE, ERIC;SCHLENKER, CHRISTOPH |
分类号 |
G04B17/06;(IPC1-7):G04B17/06 |
主分类号 |
G04B17/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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