Protection assembly for an ultrasound cleaning device for cleaning an optical surface, comprising a cover made from an electromagnetic-wave-absorbing material

A cleaning 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 ultrasound wave propagating in the optical surface;
• and
• a protection assembly including a mechanical protection element configured to cover the at least one wave transducer, such that the at least one wave transducer is between the mechanical protection element and the optical surface, and a covering made from an electromagnetic-wave-absorbing material, the covering being adapted to limit electromagnetic radiation from the wave transducer outside the cleaning assembly.

A cleaning assembly comprising:

• an optical surface;
• a cleaning unit for cleaning the optical surface, with the clean 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 ultrasound wave propagating in the optical surface, and a protection assembly including a mechanical protection element configured to cover the at least one wave transducer, such that the at least one wave transducer is between the mechanical protection element and the optical surface, and a covering made from an electromagnetic-wave-absorbing material, the covering being adapted to limit electromagnetic radiation from the wave transducer outside the cleaning assembly.