Method for determining an imbalance characteristic of an oscillator
AssigneeRolex SA
InventorsRichard Bossart, Marc Cerutti, Frédéric Burger, Olivier Hunziker, Denis Favez
Life of this patent
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Abstract
A method for determining an imbalance characteristic of a hairspring (5) balance (4) oscillator (3) of a timepiece movement (2), the method comprising at least the following steps: —Setting the hairspring balance oscillator in an oscillating motion at at least two amplitudes, —Determining, for each amplitude and for at least two positions of the oscillator, a piece of data representative of the oscillation period of the oscillator, —Using the data from the previous step to calculate the imbalance characteristic of the hairspring balance oscillator.
Claims20
A method of calculating an imbalance characteristic of a hairspring-balance oscillator, the method comprising:
- putting the hairspring-balance oscillator into an oscillating motion at first and second amplitudes at least;
- determining, for the first amplitude, at at least first and second positions of the oscillator, respective first and second data which are representative of a period of oscillation of the oscillator, and for the second amplitude, at at least third and fourth positions of the oscillator, respective third and fourth data which are representative of the period of oscillation of the oscillator, the first and second data determined for the first amplitude and the third and fourth data determined for the second amplitude forming a set of data;
- and
- calculating, from a comparison among the set of data obtained from the determining, the imbalance characteristic of the hairspring-balance oscillator.
A regulated hairspring-balance oscillator obtained by implementation of a method comprising:
- providing a hairspring-balance oscillator,
- putting the hairspring-balance oscillator into an oscillating motion at first and second amplitudes at least;
- determining, for the first amplitude, at at least first and second positions of the oscillator, respective first and second data which are representative of a period of oscillation of the oscillator, and for the second amplitude, at at least third and fourth positions of the oscillator, respective third and fourth data which are representative of the period of oscillation of the oscillator, the first and second data determined for the first amplitude and the third and fourth data determined for the second amplitude forming a set of data;
- calculating, from a comparison among the set of data obtained from the determining, an imbalance characteristic of the hairspring-balance oscillator;
- and
- modifying a balance of the hairspring-balance oscillator in order to eliminate some or all of the imbalance characteristic from the balance, so as to obtain the regulated hairspring-balance oscillator.
Dependencies are inferred from the claim text.