A method for frequency tuning a set of plates of a watch. The plates are disposed one above the other forming a watch dial with a space defined between the plates. A mechanical shock to the set of plates is generated, and the vibration frequency of each plate is checked. The vibration frequency of at least one of the plates is matched if different from the other plate so as to obtain an identical vibration frequency for each plate in order to tune the plates at least according to the first vibration eigenmode so as to avoid any contact between the plates as a result of any mechanical shock.

Disclosed is a timepiece including a case, a movement and a vibration-generating device intended to produce a sound, the latter two accommodated in the case, a device for amplifying the vibrations from the vibration-generating device, and a membrane receiving the amplified vibrations and generating a sound to outside the timepiece. The vibration-amplifying device includes a lever pivotally mounted on a support in a pivoting plane non-parallel to the plane of the membrane and actuated by a transmission member cooperating with the vibration-generating device to transmit the vibrations to the lever, the lever being integral with the membrane at least translationally in the pivoting plane so a movement of the transmission member, generated by vibration of the transmission member linked to the vibration-generating device and transmitted to the membrane by way of the lever actuated by the transmission member, generates an amplified movement of the membrane for an amplified sound.

Disclosed is a mechanical wristwatch including a case having a middle, a back cover and a bezel, a vibration-generating device for generating vibrations which are intended to produce at least one sound, which is accommodated in the case, a vibration-amplifying for amplifying the vibrations generated by the vibration-generating device, and a membrane arranged to receive the amplified vibrations and generate a sound from the inside to the outside of the wristwatch. The vibration-generating device is a rotary element having a reading surface including at least one groove arranged to generate sounds. The wristwatch also includes a unit for rotationally driving the rotary element, an actuator for such unit, and a transmission member arranged to cooperate with the rotary element to transmit, to the vibration-amplifying device, the vibrations generated by the groove during rotational movement of the rotary element.

Disclosed is a mechanical wristwatch including a case having a middle, a back cover and a bezel, a vibration-generating device for generating vibrations which are intended to produce at least one sound, which is accommodated in the case, a vibration-amplifying for amplifying the vibrations generated by the vibration-generating device, and a membrane arranged to receive the amplified vibrations and generate a sound from the inside to the outside of the wristwatch. The vibration-generating device is a rotary element having a reading surface including at least one groove arranged to generate sounds. The wristwatch also includes a unit for rotationally driving the rotary element, an actuator for such unit, and a transmission member arranged to cooperate with the rotary element to transmit, to the vibration-amplifying device, the vibrations generated by the groove during rotational movement of the rotary element.

A musical comb for a striking mechanism of a timepiece includes several tines connected to a heel for securing the comb inside the timepiece. The musical comb further includes grooves in the heel each extending into the extension of each space between the adjacent tines in order to eliminate any dissonance during actuation of the tines.

A musical comb for a striking mechanism of a timepiece includes several tines connected to a heel for securing the comb inside the timepiece. The musical comb further includes grooves in the heel each extending into the extension of each space between the adjacent tines in order to eliminate any dissonance during actuation of the tines.

An arrangement for the holding and vibration transmission of an acoustic radiating membrane (10) in a striking or musical watch (1) case (2). The case includes at least one crystal (3) mounted on a middle (4) and a back (5) mounted on a side opposite the middle. The acoustic radiating membrane is held in a portion of the watch case, such as the middle by at least one connection part (12) disposed between a peripheral rim of the membrane or an edge element (11) of the membrane and the middle by acting for the holding of the membrane in a direction parallel to the plane of the watch. The connection part may be a screw screwed into a threaded opening (14) of the middle and coming into contact with the edge element of the membrane.

An arrangement for the holding and vibration transmission of an acoustic radiating membrane (10) in a striking or musical watch (1) case (2). The case includes at least one crystal (3) mounted on a middle (4) and a back (5) mounted on a side opposite the middle. The acoustic radiating membrane is held in a portion of the watch case, such as the middle by at least one connection part (12) disposed between a peripheral rim of the membrane or an edge element (11) of the membrane and the middle by acting for the holding of the membrane in a direction parallel to the plane of the watch. The connection part may be a screw screwed into a threaded opening (14) of the middle and coming into contact with the edge element of the membrane.

A striking watch is provided with an acoustic radiating membrane made of metallic material or amorphous metal. The membrane takes the form of a loop with walls of a certain thickness to be connected by a first edge portion to a middle part of a watch case and by a second edge portion to a bezel fixed to a watch crystal. The bezel connected to crystal is movable with respect to the case middle via the membrane during the vibration of membrane once a sound is generated by a watch striking mechanism in the watch case. The membrane is configured with a wall of a specific thickness in an active region dependent on the mass of the bezel connected to the crystal, to obtain a frequency f.sub.0 of a first vibration mode.

A striking watch is provided with an acoustic radiating membrane made of metallic material or amorphous metal. The membrane takes the form of a loop with walls of a certain thickness to be connected by a first edge portion to a middle part of a watch case and by a second edge portion to a bezel fixed to a watch crystal. The bezel connected to crystal is movable with respect to the case middle via the membrane during the vibration of membrane once a sound is generated by a watch striking mechanism in the watch case. The membrane is configured with a wall of a specific thickness in an active region dependent on the mass of the bezel connected to the crystal, to obtain a frequency f.sub.0 of a first vibration mode.