Timepiece mechanism comprising a movable oscillating component with optimised geometry in a magnetic environment

摘要

A timepiece mechanism including a movable component oscillating about a rest plane passing through a pivot axis. An arbor of the movable component includes a main protruding portion which forms the largest radius of the movable component about this axis. The protruding portion is delimited by two surfaces defining a profile inscribed in a rectangle whose shape proportion is greater than 2 wherein the direction of the length defines a main axis, which occupies a determined angular position with respect to the rest plane in the rest position of the movable component. The mechanism has a preferred direction of magnetization that is substantially orthogonal to the main axis of the arbor in the rest position.

主权项

1. An arbor of a movable pivoting timepiece component configured to pivot about a pivot axis and comprising:
at least one protruding portion of which a main protruding portion defines the largest radius of the arbor about the pivot axis, wherein at least the main protruding portion is delimited, on either side of the pivot axis, by two surfaces that are symmetrical with respect to the pivot axis and which define, in projection on a plane perpendicular to the pivot axis, a profile inscribed in a rectangle whose length to width ratio defines a shape proportion which is greater than or equal to 2, the direction of the length defining a main axis, wherein the at least one the protruding portion, of rectangular profile delimited on two opposing sides by the two surfaces in the arbor, includes, to induce partial self-demagnetization in absence of an external field, at least one slot centered on the pivot axis and extending along the main axis and whose depth is greater than or equal to half the length of the protruding portion including the slot concerned exceeding the mean radius of the cylindrical portion of the arbor, and wherein the arbor is in one piece.