Protection assembly for an ultrasound cleaning device for cleaning an optical surface

A unit for cleaning an optical surface comprising at least one wave transducer intended to be acoustically coupled to the optical surface,

• the wave transducer including a piezoelectric element and electrodes of opposite polarity in contact with the piezoelectric element, and being configured to generate at least one ultrasonic wave propagating in the optical surface;
• and
• a protection assembly including a mechanical protection element configured to cover the wave transducer so that the wave transducer is positioned between the mechanical protection element and the optical surface, the mechanical protection element being configured to define, with the optical surface, at least one opening able to allow the ultrasonic wave to propagate over the optical surface outside of the mechanical protection element, and a sealing element disposed near the opening and able to limit the passage of liquid through the opening.

A cleaning assembly comprising:

• an optical surface;
• and
• a cleaning unit or cleaning the optical surface, the cleaning unit including at least one wave transducer intended to be acoustically coupled to the optical surface, the wave transducer including a piezoelectric element and electrodes of opposite polarity in contact with the piezoelectric element, and being configured to generate at least one ultrasonic wave propagating in the optical surface and a protection assembly including a mechanical protection element configured to cover the wave transducer so that the wave transducer is positioned between the mechanical protection element and the optical surface, the mechanical protection element being configured to define, with the optical surface, at least one opening able to allow the ultrasonic wave to propagate over the optical surface outside of the mechanical protection element, and a sealing element disposed near the opening and able to limit the passage of liquid through the opening.