System and method for manufacturing a light guide hairspring for a timepiece movement

Abstract

A method is disclosed for manufacturing a hairspring (1) for a timepiece movement, the method comprising the following steps: producing a malleable elongated element in the form of a fibre or ribbon from a first heated material capable of guiding light, shaping the malleable elongated element into a spiral, and processing the thus obtained spiral element in order to produce a hairspring providing both a mechanical oscillator function in a hairspring-balance wheel assembly and an optical guidance function. The shaping step comprises a step in which the malleable elongated element is wound around a rotary shaping tool. A system (12) is disclosed for manufacturing a hairspring (1) for a timepiece according to the method disclosed, and comprises: a fibre-drawing tower (120) for producing a glass fibre (121), a device for drawing the fibre (121) from the fibre-drawing tower (120), a shaping tool (122) rotatable about a vertical axis and having a spiral, truncated cone shape for receiving the drawn fibre, which is wound around said shaping tool.

Dependencies are inferred from the claim text.