Hairspring, timepiece movement, and timepiece
AssigneeSeiko Watch Kabushiki Kaisha (Trading AS Seiko Watch Corporation)
InventorsTomokazu Ejiri, Terutaka Sugiyama, Naoki Amano, Jun Tsuneyoshi
Life of this patent
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Abstract
An object of the present invention is to provide a hairspring, a timepiece movement, and a timepiece. A hairspring according to the present invention is characterized by being made of a Nb—Mo alloy containing 5% or more and 14% or less of Mo in at %. Alternatively, a hairspring according to the present invention is characterized by being made of a Nb—Mo alloy containing 5% or more and 14% or less of Mo in at %, inevitable impurities and balance Nb. It is preferable that the hairspring has a deformation texture and a region having a <110>∥{001} orientation degree in a cross section is 30% or more of an entire cross-sectional area.
Claims12
A hairspring, comprising:
- a base material, comprising a Nb—Mo alloy containing 5% or more and 14% or less of Mo in atomic percentage (at %;
- a first oxide coating film layer covering an outer peripheral surface of the base material, the first oxide coating film layer comprising Nb, Mo, and O;
- and
- a second oxide coating film layer covering an outer peripheral surface of the first oxide coating film layer, the second oxide coating film layer comprising Nb and O.
A hairspring, comprising:
- a base material, consisting of a Nb—Mo alloy containing 5% or more and 14% or less of Mo in at %, impurities, and Nb;
- a first oxide coating film layer covering an outer peripheral surface of the base material, the first oxide coating film layer comprising Nb, Mo, and O;
- and
- a second oxide coating film layer covering an outer peripheral surface of the first oxide coating film layer, the second oxide coating film layer comprising Nb and O.
Dependencies are inferred from the claim text.