Ultrasonic wave transmitting and receiving device for vehicles

Details Ultrasonic wave transmitting and receiving device for vehicles Ultrasonic wave transmitting and receiving device for vehicles

1981-04-17

1984-04-10

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

181400, 181177, 340 90A, 367112, 367909, G01S 1593

Patent

active

044425120

ABSTRACT:
An ultrasonic wave transmitter and receiver adapted to be mounted on the rear portion of a vehicle to detect the distance between the rear end of the vehicle and any obstruction located at the rear side of the vehicle. The ultrasonic wave transmitter and receiver includes an ultrasonic transducer attached to a lower part of the vehicle at a portion spaced from the rear end of the vehicle in the forward direction of the vehicle by a predetermined distance, a horn opening rearwardly from the vehicle and a wave guide tube through which the horn and the ultrasonic transducer are coupled to each other. The distance between the ultrasonic transducer and the rear end of the vehicle is selected to correspond to a time length which is long enough to sufficiently attenuate the residual oscillation of the ultrasonic transducer.

REFERENCES:
patent: 1368736 (1921-02-01), Lavigne
patent: 1423802 (1922-07-01), Hofstatter
patent: 2467301 (1949-04-01), Firestone
patent: 2974304 (1961-03-01), Nordlund
patent: 3842397 (1974-10-01), Sindle

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