OSCILLATOR FOR A TIMEPIECE BALANCE SPRING ASSEMBLY

摘要

The present invention relates to a hairspring (3) to be provided on a balance wheel (2) of a balance spring assembly (1) of a mechanical timepiece, characterized in that said hairspring is manufactured using a titanium alloy containing: a titanium base; 10 at.% to 40 at.% of at least one element among Nb, Ta, or V; 0 at.% to 3 at.% oxygen; 0 at.% to 6 at.% zirconium; and 0 at.% to 5 at.% hafnium. The hairspring of the invention is less temperature-sensitive and has lower density than a conventional hairspring.