Timepiece resonator mechanism
AssigneeThe Swatch Group Research and Development Ltd
InventorsGianni Di Domenico, Dominique Lechot, Jean-Luc Helfer, Pascal Winkler
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Abstract
A watch or movement including a timepiece resonator movement including two RCC flexural pivots mounted in series about an intermediate rotary support and having the same virtual pivot axis, each including two straight flexible strips of the same length, whose clamping points opposite to this pivot axis are at the same distance with respect to this axis, and which define linear directions, forming angles, in pairs, with this virtual pivot axis, whose value expressed in degrees is comprised between: 109.5+5/[(D/L)−(2/3)] and 114.5+5/[(D/L)−(2/3)], or more particularly between 107+5/((D/L)−(2/3)) and 112+5/((D/L)−(2/3)).
Claims14
A timepiece resonator mechanism comprising a first support with a first anchor and a second anchor, wherein a flexural pivot mechanism is attached to said first support, wherein said flexural pivot mechanism defines a virtual pivot axis about which rotatably pivots a pivoting weight, and wherein said flexural pivot mechanism includes at least one front RCC flexural pivot and one back RCC flexural pivot, mounted in series and head-to-tail relative to each other about said virtual pivot axis,
- said front RCC flexural pivot including, between said first support and an intermediate rotary support, two straight flexible front strips of the same front length LA between the clamping points thereof, defining two linear front directions which intersect at said virtual pivot axis and which define, with said virtual pivot axis, a front angle, and wherein the respective anchors of said two straight flexible front strips farthest from said virtual pivot axis are both at the same front distance DA from said virtual pivot axis,
- and said back RCC flexural pivot including, between said intermediate rotary support, which includes a third anchor and a fourth anchor, and said pivoting weight, two straight flexible back strips of the same back length LP between the clamping points thereof, defining two linear back directions which intersect at said virtual pivot axis and which define, with said virtual pivot axis, a back angle, and wherein the respective anchors of said two straight flexible back strips farthest from said virtual pivot axis are both at the same back distance DP from said virtual pivot axis,
- wherein said flexural pivot mechanism is planar, wherein the center of inertia of the assembly formed by said pivoting weight and any added inertial weight carried by said pivoting weight is on said virtual pivot axis or in immediate proximity thereto,
- wherein said front angle expressed in degrees is comprised between:
- 107+5/[(DA/LA)−(2/3)] and 114.5+5/[(DA/LA)−(2/3)],
- wherein said back angle expressed in degrees is comprised between:
- 107+5/[(DP/LP)−(2/3)] and 114.5+5/[(DP/LP)−(2/3)].
Dependencies are inferred from the claim text.