Curve elevation hairspring i.e. Breguet hairspring, for balance wheel resonator of time piece, has curve that is extended in same plane as another curve and is connected to elevation device to adapt concentricity of hairspring

摘要

The hairspring (1) has a spiral-spring (3) coaxially formed with a collet (2), where the hairspring is made of silicone or silicon dioxide so as to allow the hairspring to be mechanically resistant and to adjust the thermo elastic coefficient. An elevation device (5) is placed between an external coil (6) of the spiral-spring and a terminal curve (7) to form a Breguet hairspring. Another terminal curve (9) is extended in the same plane as the former terminal curve, and is connected to the elevation device to adapt the development concentricity of the hairspring.