The present invention relates to a wristwatch comprising a mechanical clock movement with a tuning fork resonator. The oscillator preferably comprises a material A with a low internal friction. In the oscillator of the invention, the unwanted symmetrical oscillations are avoided, for example, by the choice of the materials from which the tuning fork is manufactured. According to preferred embodiments, the rod and/or fastening of the oscillator comprises a material having greater internal friction than that of said material A, such that the quality factor Q.sub.2 of the symmetrical oscillations is reduced, in contrast to the quality factor Q.sub.1 of the anti symmetrical oscillation mode.

A mechanical oscillator endowed with a strip, with the aforesaid strip incorporating a first silicon layer having a crystal lattice extending along a first direction of one plane, a thermal compensation layer composed of a material having a Young's modulus thermal coefficient of opposite sign to that of the silicon, and a second silicon layer having a crystal lattice extending in a second direction of the plane, with the first and direction being offset at an angle of 45° within the plane of the layers, and with the thermal compensation layer extending between the first and second silicon layers.

A flexible guide for a rotary resonator mechanism, in particular of a horological movement, the guide including a first support, an element movable relative to the first support, a first pair of flexible strips connecting the first support to the movable element, so that the movable element can displace relative to the first support by bending the strips in a circular movement about a centre of rotation, the flexible guide being arranged substantially in a plane, including a prestressing device, the prestressing device being configured to apply a force for buckling the flexible strips by bringing the first support closer to the movable element, so that the flexible guide includes two stable positions of the element movable relative to the first support for which the return moment is zero, the two stable positions having a predetermined angle of rotation therebetween.

A drive member and a mechanism for a timepiece including such a drive member includes at least two monolithic units stacked and connected in series, each of these units including a hub and a rim which are connected by at least one elastic arm.

A drive member and a mechanism for a timepiece including such a drive member includes at least two monolithic units stacked and connected in series, each of these units including a hub and a rim which are connected by at least one elastic arm.

There is disclosed a timepiece resonator having an inertia element suspended from a flexible strip deformable in a plane XY parallel to a longitudinal direction Y, and whose transverse extension along a transverse axis X, in projection onto the plane XY, is variable and of positive value on at least one side of the neutral axis (FN) of said strip, which includes, at a distance from its embedments, at least one rib extending along an axis Z perpendicular to the plane XY, each having at least one generatrix which is farther from the neutral axis (FN) than the external surfaces of the sections of the strip located outside the ribs, and the longitudinal extension (LN) of each rib of the strip, along the longitudinal axis Y, is less than one fifth of the length L of the strip between its embedments.

There is disclosed a timepiece resonator having an inertia element suspended from a flexible strip deformable in a plane XY parallel to a longitudinal direction Y, and whose transverse extension along a transverse axis X, in projection onto the plane XY, is variable and of positive value on at least one side of the neutral axis (FN) of said strip, which includes, at a distance from its embedments, at least one rib extending along an axis Z perpendicular to the plane XY, each having at least one generatrix which is farther from the neutral axis (FN) than the external surfaces of the sections of the strip located outside the ribs, and the longitudinal extension (LN) of each rib of the strip, along the longitudinal axis Y, is less than one fifth of the length L of the strip between its embedments.

A pivot mechanism for guiding in rotation comprises a mobile element connected to a fixed element through flexible connections; with the flexible elements being configured to guide the mobile element according to a rotational movement in a plane, around a pivoting axis perpendicular to the plane; with each of the flexible connections comprising an intermediary junction provided with an expansion slot, the expansion slot being configured to expand during the rotation of the mobile element, so that the mobile element can pivot according to a second angular amplitude that is greater than a first angular amplitude achieved without said expansion slot; with the intermediary junctions being connected to one another by a coupling member; each of the coupling members being configured so as to prevent a movement out of the plane and a lateral movement in the plane of the mobile element. The pivot mechanism has a very high rotational amplitude.

A device for guiding a pivoting mass about an axis. A first support is fixed and a second support forms or supports the pivoting mass. The device is includes a first and second flexible leaf oriented in the same direction when the device is at rest, and an intermediate leaf having a rigidity notably greater than the flexible leaves and connecting the first flexible leaf to the second, the device including a first fixed link formed by the first support and a first end of the first leaf, a second fixed link formed by a second end of the first leaf and by a first end of the intermediate leaf, a third fixed link formed by a second end of the intermediate leaf and by a first end of the second leaf and a fourth fixed link formed by at least one second end of the second leaf, wherein the first and/or the fourth link is arranged substantially between the second and the third link in the direction when the device is at rest.

Disclosed is a method for manufacturing a horological component according to which a silicon-based piece having the desired shape of the horological component is produced and the piece is subjected to a thermal oxidation and deoxidation treatment to remove a predetermined thickness of silicon in order to increase the mechanical strength of the piece. This method is characterized in that the thermal oxidation and deoxidation treatment is carried out in several steps, each step including a thermal oxidation phase followed by a deoxidation phase.