Method for developing a resonator mechanism with a rotating flexible guide to reduce out-of-plane oscillations

A method of setting up a resonator mechanism for a timepiece, comprising a structure and an anchoring block from which at least one inertial element is suspended arranged to oscillate with a first degree of freedom in rotation RZ about a pivot axis (D) extending in a first direction Z, said inertial element being subjected to return forces exerted by a flexible pivot comprising a plurality of substantially longitudinal resilient blades, each fixed at a first end to said flexible pivot, each fixed at a first end to said anchoring block, and at a second end to said inertial element, each said elastic blade being deformable essentially in a plane XY perpendicular to said first direction Z, said anchoring block being suspended from said structure by a flexible suspension arranged to allow mobility of said anchoring block, wherein the method comprises:

• a first step of measuring a reference oscillation frequency of the inertial element about the Z direction in the XY plane;
• a second step of measuring at least one secondary oscillation frequency of the inertial element about the X direction in the YZ plane or about the Y direction in the XZ plane;
• a third step of comparing the secondary oscillation frequency with the reference oscillation frequency, to verify that the secondary oscillation frequency has a value substantially different from a multiple of the reference oscillation frequency;
• and
• in the case where the secondary oscillation frequency has a value close to or substantially equal to a multiple of the reference oscillation frequency, a fourth step of adapting flexible suspension or substituting flexible suspension with another flexible suspension, so as to have a configuration of flexible suspension modified such that the secondary oscillation frequency is substantially different from a multiple of the reference oscillation frequency.