Manufacturing method for mechanical resonators

A method for manufacturing a set of mechanical resonators having structural characteristics with an average value comprised within a predetermined range of values, said structural characteristic being common to each resonator in said set, the method comprising the following steps:

• a) forming in said plate mechanical resonators with dimensions different from the dimensions necessary to obtain the set of mechanical resonators having structural characteristics comprised within said predetermined range of values;
• b) forming in said plate at least one oscillating member in an opening made in the plate, said member consisting of a trunk with a body joined at a first end to a securing part of a wall in this opening, and of two flexible arms joined at a second end of said trunk by a connecting part, said arms being parallel to an axis of symmetry (A) of said trunk and extending towards a part of said wall opposite the securing part, the body of said trunk comprising a portion between the first and second ends with an axial section (S4) that is smaller than the axial sections (S2, S1) of the first and second ends, respectively;
• c) determining a value relative to the structural characteristic of said at least one oscillating member formed;
• d) calculating dimensional corrections to be applied to the resonators formed, based on the value determined for the structural characteristic;
• e) modifying the dimensions of the resonators formed, based on the dimensional corrections calculated to obtain the set of resonators having structural characteristic values comprised within the predetermined range of values.