Vitre, notamment pare-brise pour véhicule automobile, comportant un dispositif ultrasonore intégré pour la détection de corps étrangers présents sur une de ses faces.

摘要

The invention relates to a window comprising at least a first sheet (16), and a second sheet (18), the said sheets (16, 18) being joined together by a bonding layer (20), characterised in that it further comprises an ultrasound detection device (12) located between the said sheets (16, 18) and interacting directly with a first face (24) of the said first sheet (16) so as to detect the presence of foreign bodies (matter) on a second face (26) of the said first sheet (16) opposite the said first face (24), the said device (12) comprising a transducer (28) which can, via an emitter/receiver face, emit an incident ultrasound signal of wavelength lambda into the said first sheet (16), the thickness of the said first sheet being equal to K lambda /2, where K is an integer, and the said transducer being able to receive, via the said emitter/receiver face, a reflected ultrasound signal representing the presence or absence of the said foreign bodies in order to formulate a detection signal.