The present invention is provided with the following: an airborne ultrasonic sensor (2) that has an emission surface (21a) which faces out, and that is attached in a through hole (11) of an attachment part (1); and an acoustic matching layer (3) that matches the acoustic impedance of the airborne ultrasonic sensor (2) and the acoustic impedance of air, and in which microcapsules (31) are added to the same material as the attachment part (1).
Obstruction detection device
2015-10-28
Patent
Electronic Resource
English
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