FIELD: physics.
SUBSTANCE: watch regulating element (1) contains a balance wheel (2) which oscillates about the axis (D) and is subjected to the torque applied by the torsional return means (4). The balance (2) comprises fastening means (10) forcing it to oscillate together with a torsional wire (5), which forms the above-mentioned torsional return means (4) especially for the above-mentioned balance (2). The largest cross-section size of the useful section (51; 52) of the above-mentioned torsional wire (5) which is subjected to torsion is less than 100 microns, the smallest cross-section size of the above-mentioned useful section (51; 52) is less than 50 microns, the total length (LT) of the above-mentioned torsional wire (5) is less than 6 millimeters, and the above-mentioned regulating element (1) comprises tensioning means (400) of the above-mentioned torsional wire (5).
EFFECT: improved accuracy.
26 cl, 15 dwg
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