US 12,287,609 B2
Method for adjustment of a flexute pivot timepiece oscillator
David Chabloz, Cranves-Sales (FR)
Assigned to PATEK PHILIPPE SA GENEVE, Geneva (CH)
Appl. No. 17/626,303
Filed by PATEK PHILIPPE SA GENEVE, Geneva (CH)
PCT Filed Jul. 7, 2020, PCT No. PCT/IB2020/056370
§ 371(c)(1), (2) Date Jan. 11, 2022,
PCT Pub. No. WO2021/009613, PCT Pub. Date Jan. 21, 2021.
Claims priority of application No. 19185980 (EP), filed on Jul. 12, 2019.
Prior Publication US 2022/0317628 A1, Oct. 6, 2022
Int. Cl. G04B 17/20 (2006.01); G04B 17/04 (2006.01); G04B 17/06 (2006.01)
CPC G04B 17/20 (2013.01) [G04B 17/045 (2013.01); G04B 17/063 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for adjustment of a timepiece oscillator comprising a balance, a support and a flexure pivot connecting the balance to the support and guiding the balance in rotation with respect to the support about a virtual axis of rotation, the flexure pivot having, in orthogonal projection in a plane perpendicular to the virtual axis of rotation, an axis of symmetry which is also an axis of symmetry for points where the flexure pivot is joined to the balance, the method comprising:
selecting an amplitude of oscillation for the timepiece oscillator; and
adjusting an unbalance of the balance so that, in orthogonal projection in said plane, a center of mass of the balance is substantially on the axis of symmetry and at a position distinct from that of the virtual axis of rotation,
wherein the position of the virtual axis of rotation is not modified by said adjusting, said position of the center of mass being chosen so as to render minimal a dependency of an oscillation frequency of the timepiece oscillator on an orientation of the timepiece oscillator with respect to the force of gravity for a the selected amplitude of oscillation.