Crystal-bezel assembly unit for a timepiece and process assembly

A method for assembly between a crystal and a bezel, wherein the bezel has a notch for accommodating the crystal, for use of the crystal in a striking or musical timepiece as a vibrating element radiating a diffusion of an acoustic signal emitted from a vibration source, or a striking train, or a musical box, or an alarm clock, and transmitted to the bezel, wherein the method comprises the steps of:

• (a) determining an appropriate number of unconnected junction zones intended to form together the only direct mechanical link for the transmission of vibration from the bezel to the crystal, wherein the crystal has no direct contact with the bezel outside the junction zones;
• (b) creating an alternating sequence of the junction zones created to support and rigidly secure the crystal in direct contact with the bezel, and a plurality of sealing zones where the crystal has no direct contact with the bezel and can vibrate in-plane;
• (c) securing the crystal onto the bezel by supporting and clamping at each junction zone on a junction surface of the bezel in order to transmit every vibration communicated to the bezel to the crystal;
• and
• (d) forming a peripheral space outside the junction zone or zones, wherein the peripheral space is formed from a succession of sealing zones alternating with the junction zones, wherein each of the sealing zones is delimited by the crystal and one sealing surface, and wherein the crystal is kept at a distance from the bezel to allow vibrations of the crystal without impedance.