| 摘要 |
The invention relates to an ultrasonic sensor (10), especially used as a parking aid for a motor vehicle. The ultrasonic sensor (10) consists of a sensor membrane (12) arranged in a housing (11). A piezoelectric converter (14) is fixed on the inner side of the sensor membrane. First decoupling means (15) are used to arrange the sensor membrane (12) in the housing (11). Second decoupling means (16) are provided to avoid a mechanical damping effect arising from the motor vehicle or the transmission of external vibrations on the sensor membrane (12) and are arranged between the sensor membrane (12) and the covering of part of the motor vehicle or another protective covering. The second decoupling means (16) consist of a fine air gap which is located between the sensor membrane (12) and a protective wall (17) surrounding said sensor membrane and acting as a protective covering. A film (19) rising above the second decoupling means, which are embodied as a fine air gap (18), and parts of the protective wall (17) is applied to the sensor membrane (12) on the front side thereof.
|
