A watch case having a locking system for at least one control element of a timepiece, the locking system including a manipulable element, a locking element for the at least one control element, and a kinematic link linking the manipulable element to the locking element, the locking system being arranged on the outside of a chamber (63), more particularly on the outside of a water-resistant chamber, defined by the case, the locking element being rotatably mounted, more particularly rotatably mounted about a second axis (A1) of the at least one control element.

A rotating piezoelectric motor including a piezoelectric actuator including a resonator having a pair of arms connected at one of their ends in a connection area, the other two ends being referred to as ‘free’, a passive element able to be driven in rotation by the friction of the free ends on the passive element, the passive element including a disc and a rim extending from the periphery of the disc, the rim passing between the free ends of the arms.

A rotating piezoelectric motor including a piezoelectric actuator including a resonator having a pair of arms connected at one of their ends in a connection area, the other two ends being referred to as ‘free’, a passive element able to be driven in rotation by the friction of the free ends on the passive element, the passive element including a disc and a rim extending from the periphery of the disc, the rim passing between the free ends of the arms.

Main surface electrodes formed on main surfaces on front and back sides of vibrating arms are electrically coupled via through electrodes formed in a stem portion so as to penetrate through front and back surfaces thereof. One of the main surface electrodes of the vibrating arm is electrically coupled to side surface electrodes through a routing wiring formed by way of a crotch part between roots of the vibrating arms, and the one of the main surface electrodes is further electrically coupled to the other one of the main surface electrodes through the side surface electrodes.

Main surface electrodes formed on main surfaces on front and back sides of vibrating arms are electrically coupled via through electrodes formed in a stem portion so as to penetrate through front and back surfaces thereof. One of the main surface electrodes of the vibrating arm is electrically coupled to side surface electrodes through a routing wiring formed by way of a crotch part between roots of the vibrating arms, and the one of the main surface electrodes is further electrically coupled to the other one of the main surface electrodes through the side surface electrodes.

The invention relates to a piezoelectric resonator, which comprises a base and at least two vibrating arms (3) extending from the base, at least two grooves (4a, 4b) being formed opposite each other on part of the length of the arms and on upper and lower faces of the arms. The depth of the groove on the upper face is less than 30% of the total thickness of each arm and the depth of the groove on the lower face is more than 50% of the total thickness of each arm, or reversely.

A rotating piezoelectric motor including a piezoelectric actuator including a resonator having a pair of arms connected at one of their ends in a connection area, the other two ends being free, a passive element including a cylindrical part extending substantially orthogonally to the resonator and passing between the free ends of the arms, the cylindrical part being rotatable by friction of the free ends, the passive element including: a lower and upper truncated cones, the small bases of the cones being arranged facing each other and on either side of the resonator, the cylindrical part of the passive element at least partly axially traversing the cones, the upper truncated cone being movable along the cylindrical part, and at least one of the cones being integral in rotation with the cylindrical part, a device for holding the lateral surfaces of the cones in contact with each of the free ends of the arms of the resonator.

A rotating piezoelectric motor including a piezoelectric actuator including a resonator having a pair of arms connected at one of their ends in a connection area, the other two ends being free, a passive element including a cylindrical part extending substantially orthogonally to the resonator and passing between the free ends of the arms, the cylindrical part being rotatable by friction of the free ends, the passive element including: a lower and upper truncated cones, the small bases of the cones being arranged facing each other and on either side of the resonator, the cylindrical part of the passive element at least partly axially traversing the cones, the upper truncated cone being movable along the cylindrical part, and at least one of the cones being integral in rotation with the cylindrical part, a device for holding the lateral surfaces of the cones in contact with each of the free ends of the arms of the resonator.

A linear piezoelectric motor including a passive element having an elongated shape, and a piezoelectric actuator including a resonator including a pair of arms connected at one of their ends at a connection zone, the two other ends being called free, the passive element being capable of being moved linearly between the free ends by friction of the free ends against the passive element, the passive element and the resonator being inclined with respect to one another by a non-zero angle () of less than 90 degrees.

A linear piezoelectric motor including a passive element having an elongated shape, and a piezoelectric actuator including a resonator including a pair of arms connected at one of their ends at a connection zone, the two other ends being called free, the passive element being capable of being moved linearly between the free ends by friction of the free ends against the passive element, the passive element and the resonator being inclined with respect to one another by a non-zero angle () of less than 90 degrees.