An ultrasonic sensor assembly for a vehicle reversing radar has an ultrasonic
sensor (10) with two electric wires (12). A sleeve (20) is
made of rubber material and has a chamber (22) receiving the sensor (10).
A cone-shaped opening (24) is defined at a front end of the chamber (22).
A guide wave cone (30) is provided at the center of the cone-shaped opening
(24) and abuts the sensor (10). By using the sensor assembly, the
vehicle reversing radar can have a high precision with a long detectable distance
in a concentrated area.
