Method for manufacturing timepiece thermocompensated hairsprings of precise stiffness
AssigneePatek Philippe SA Geneve
InventorsFrédéric Maier, Sylvain Jeanneret
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Abstract
The method for manufacturing timepiece hairsprings according to the invention comprises the following successive steps: a) forming hairsprings in a wafer, b) forming a thermal compensation layer on the hairsprings, c) identifying the hairsprings having a stiffness within a predetermined range, d) optionally, detaching from the wafer the hairsprings identified in step c), e) modifying the other hairsprings so that the stiffness of at least some of them is within the predetermined range, f) detaching from the wafer these other hairsprings and, if they have not been detached in step d), the hairsprings identified in step c). This method makes it possible to reduce manufacturing dispersions between the hairsprings.
Claims12
Method for manufacturing timepiece hairsprings comprising the following successive steps:
- a) forming hairsprings in a wafer,
- b) forming a thermal compensation layer on the hairsprings,
- c) identifying the hairsprings having a stiffness within a predetermined range,
- d) optionally, detaching the hairsprings identified in step c) from the wafer,
- e) modifying the other hairsprings so that the stiffness of at least some of them is within the predetermined range,
- f) detaching from the wafer these other hairsprings and, if they have not been detached in step d), the hairsprings identified in step c).
Dependencies are inferred from the claim text.