Apparatus for detecting obstructions behind vehicle
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United States of America Patent
Stats
-
Oct 21, 1986
Grant Date -
N/A
app pub date -
Nov 15, 1983
filing date -
Nov 17, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for detecting obstructions behind a vehicle, employing ultrasonic waves is disclosed. The apparatus comprises an ultrasonic transmitting and receiving device disposed on the rear portion of the vehicle, an electric motor for rotating the transmitting and receiving device at a constant velocity, an angle sensor for detecting the rotating angle of the transmitting and receiving device and a sonar circuit for emitting ultrasonic waves through the transmitting and receiving device at predetermined rotating angles, receiving ultrasonic waves reflected from obstructions through the transmitting and receiving device at predetermined rotating angles and measuring the distance to the obstructions from the time taken from the transmission to the reception of the ultrasonic waves. According to the apparatus of the present invention, the distances to obstructions in every region behind the vehicle can be accurately and easily measured by rotating a single transmitting and receiving device by means of the electric motor at a constant velocity.
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