Ultrasonic distance sensor

Details Ultrasonic distance sensor Ultrasonic distance sensor

1988-08-11

1990-04-17

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367903, 367188, G01S 1500

Patent

active

049186728

ABSTRACT:
An ultrasonic distance sensor transmitting from and receiving an ultrasonic wave with a single ultrasonic transmitting and receiving element to measure proximate distances such as vehicle floor heights or distances to obstacles or pedestrians approaching relative to a vehicle. The ultrasonic transmitting and receiving element is accommodated by means of a resilient member having beads, under pressure in a casing and secured therein, thus attenuating residual vibration which disturbs accurate measurement of the proximate distances. The beads also serve to prevent water from invading into the case. The sensor incorporates a protection circuit for preventing burn-out of an output transistor due to accidental prolonged transmission.

REFERENCES:
patent: 4572253 (1986-02-01), Farmer et al.
patent: 4779246 (1988-10-01), Dietzsch et al.

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