Ultrasonic transducer

Details Ultrasonic transducer Ultrasonic transducer

1985-01-31

1987-01-13

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

367909, 181104, 181206, 340904, 73632, H04R 120

Patent

active

046369970

ABSTRACT:
An ultrasonic transducer comprises a cylindrical housing embedded within a rear bumper of a vehicle and opening backward, a reflecting plate having a parabolic reflecting surface provided within the cylindrical housing along a closed end thereof and facing an open end thereof, and an ultrasonic vibrator provided in an upper wall of the housing at the focus of the reflecting plate for emitting and receiving ultrasonic waves. The ultrasonic transducer transmits ultrasonic waves behind the vehicle and receives ultrasonic waves reflected from an obstacle. The ultrasonic transducer further comprises a projecting member provided on the inner wall of the housing along the open end thereof for dispersing and cancelling the ultrasonic waves entering the housing at angles with respect to the axis of the housing. The projecting member has a smoothly curving cross section having a radius of substantially one fourth to five times the wavelength of the ultrasonic waves emitted by the ultrasonic vibrator.

REFERENCES:
patent: 4433398 (1984-02-01), Kodera et al.
patent: 4581685 (1986-04-01), Kago et al.

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