Balance spring and method for manufacturing the same
AssigneeNivarox-FAR S.A.
InventorsMarco Verardo, Christian Charbon
Life of this patent
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Abstract
A balance spring (1) intended to be fitted to a timepiece balance having fixed inertia, the balance spring (1) being formed of a core (10) having lateral faces (10c) connecting an upper face (10a) to a lower face (10b), the balance spring (1) including on one of the lateral faces (10) in one portion of the outer coil (5), a coating formed of one or more layers, the coating including two layers with a first electrically conductive layer (12) coated with a second outer layer (13) made of a ceramic, or a combined layer (13), made of an electrically conductive ceramic. Also a method of manufacturing this balance spring.
Claims13
A timepiece comprising a balance having fixed inertia and an index assembly comprising two index pins (9), wherein the timepiece includes a balance spring (1) which is formed of a core (10) having lateral faces (10c) connecting an upper face (10a) to a lower face (10b), said balance spring (1) comprising on one of the lateral faces (10) in one portion of the outer coil (5), a coating formed of one or more layers, said coating being characterized in that it includes:
- two layers with a first electrically conductive layer (12) coated with a second outer layer (13) made of a ceramic, said second layer arranged to contact at least one of said index pins,
- or
- a combined layer arranged to come into contact with at least one of said index pins, said combined layer (13) being made of an electrically conductive ceramic.
Dependencies are inferred from the claim text.