An horological movement includes an analogue time display, a geartrain, a barrel and an electromechanical oscillator, which is formed of a resonator, including a balance and a piezoelectric balance-spring, and a mechanical escapement, and further includes an electronic control circuit connected to an electrical energy source and arranged to be able to control the application of an electrical voltage on at least one electrode of the piezoelectric balance-spring so as to generate driving electrical pulses for the oscillator. The horological movement is configured such that the barrel is capable, in a first main state, of maintaining alone a functional oscillation of the oscillator with a first amplitude, while in a second main state, the electronic control circuit powers the piezoelectric balance-spring to maintain, partially or fully, the oscillation of the resonator with a second amplitude greater than the first amplitude for any spatial orientation, the second amplitude being preferably constant.

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 horological movement (6) including: a plate (7); a mechanical resonator (8) including an oscillating balance (11) rotatably mounted relative to the plate (7), and a spiral spring (22) coupled to the balance (11); an electromagnetic regulator (29) coupled to the mechanical resonator (8) to regulate the frequency of the oscillations of the balance (11), and including at least one permanent magnet (30) fixedly mounted relative to the plate (7), at least one coil (31), a quartz or silicon resonator (32) and an electronic circuit (33) connected to the resonator (32) and to the coil (31), all mounted on the balance (11) while being completely included in an inner cavity (18) delimited by the latter.

A horological movement (6) including: a plate (7); a mechanical resonator (8) including an oscillating balance (11) rotatably mounted relative to the plate (7), and a spiral spring (22) coupled to the balance (11); an electromagnetic regulator (29) coupled to the mechanical resonator (8) to regulate the frequency of the oscillations of the balance (11), and including at least one permanent magnet (30) fixedly mounted relative to the plate (7), at least one coil (31), a quartz or silicon resonator (32) and an electronic circuit (33) connected to the resonator (32) and to the coil (31), all mounted on the balance (11) while being completely included in an inner cavity (18) delimited by the latter.

A horological movement includes an analogue time display, a gear train, a barrel driving the analogue display via the gear train, and an oscillator formed of a resonator, including a balance and a piezoelectric spring, and a mechanical escapement coupling the balance to the gear train. This horological movement further includes an electric energy source which is associated with the electronic control circuit, which is arranged to be able to control the application of an electrical supply voltage to the piezoelectric spring so as to excite the oscillator to obtain a functional oscillation of the resonator and then to maintain this functional oscillation. The mechanical escapement is configured so as to be an escapement for counting the alternations of the functional oscillation, so as to pace the running of the horological movement, without the resonator being able to receive from the barrel via this mechanical escapement enough mechanical energy to maintain the functional oscillation.

Horological resonator (100) including an inertia mobile component (1) oscillating about an axis of oscillation (D1) and including at least one magnetic area (10), the total resultant magnetic moment of all of the magnetic areas (10), included in the inertia mobile component (1), is aligned in the direction of the axis of oscillation (D1), this inertia mobile component (1) bearing at least one balancing magnet (6), the direction of the magnetic moment thereof crosses the axis of oscillation (D1) to obtain magnetic balancing of the inertia mobile component (1).

Disclosed is an adjustment method for a timepiece oscillator including a balance, a support and a flexure pivot connecting the balance to the support and guiding the balance in rotation as 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 the points where the flexure pivot joins the balance. In the method, the unbalance of the balance is adjusted so, in orthogonal projection in the plane, the 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 and chosen to reduce, and preferably render minimal, the dependency of the oscillation frequency with respect to the orientation of gravity for a predetermined amplitude of oscillation.

Disclosed is an adjustment method for a timepiece oscillator including a balance, a support and a flexure pivot connecting the balance to the support and guiding the balance in rotation as 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 the points where the flexure pivot joins the balance. In the method, the unbalance of the balance is adjusted so, in orthogonal projection in the plane, the 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 and chosen to reduce, and preferably render minimal, the dependency of the oscillation frequency with respect to the orientation of gravity for a predetermined amplitude of oscillation.

Inertia mobile component (1) for a horological resonator (100), oscillating about an axis of oscillation (D1), and including at least one magnetic area (10), the total resultant magnetic moment of all of the magnetic areas (10), included in the inertia mobile component (1), is aligned in the direction of the axis of oscillation (D1), this inertia mobile component (1) bearing at least one magnetic compensating element (4), the magnetisation component thereof in a direction perpendicular to the axis of oscillation (D1) can be adjusted in order to obtain a total resultant magnetic moment that is aligned in the direction of the axis of oscillation (D1).

A method for compensating the rate as a function of the temperature of a watch (1). A water-resistant case (2) contains a movement (3) with an oscillator (4), in an internal volume V occupied by n moles of a gas of constant R, where the pressure coefficient Cp and the humidity coefficient Ch of the movement (3) are determined, an optimal value Cto of the thermal coefficient Ct of the oscillator (4) is calculated defining the relatively linear variation of the rate thereof as a function of the temperature T, compensating the pressure and humidity deviations. The pressure P and/or the constant R and/or the quantity of gas and/or the temperature T are varied in the case. In the factory, the thermal coefficient of elastic return, and/or the quantity and/or the nature of the gas in the watch, and/or the internal volume of the case (2) are modified.