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AssigneeNivarox-FAR S.A.
InventorsPierre CUSIN, Alex GANDELHMAN, Anguel KOSTADINOV
Estimating the term…
A method for producing a thermocompensated and coloured coil spring including the steps of forming a first layer of silicon oxide on at least one face of the core and on at least one other face of the core, the first layer having a thickness equal to a fraction of the thickness required for achieving thermal compensation, removing the first layer from at least one face of the core, forming a second layer of silicon oxide on at least one face of the core and on at least one other face of the core, the second layer having a thickness equal to the remaining fraction of the thickness required for achieving thermal compensation which is lower than or equal to 1 μm for giving at least one face of the core a colour as a result of the interference effect.
A method for producing a thermocompensated and coloured coil spring for a watchmaking piece, said method comprising the successive steps of:
A thermocompensated and coloured coil spring for a watchmaking piece comprising a silicon core, wherein the core comprises:
Dependencies are inferred from the claim text.