| 摘要 |
PROBLEM TO BE SOLVED: To provide a balance spring made of a micromachinable material with an isochronism correction.SOLUTION: There is provided a timepiece balance spring 1 made of a micromachinable material including a plurality of stages 10 is provided, each stage forming a spiral wound spring, parallel to each other and all attached to a common axial collet or to the same balance staff, each stage including, at its respective outer end 30, its own attachment means 40 to a balance spring stud, the its own attachment means 40 being independent of those of the other stages, the attachment means including a position adjustment means 50 with respect to a balance spring stud, which is also independent of those of the other stages, the attachment means and the position adjustment means together forming a built-in isochronism correction mechanism for the balance spring 1, and the position adjustment means including a plurality of discrete position adjustment positions including housings each arranged to retain a stud 3.SELECTED DRAWING: Figure 1 |
