Capacitance-type ultrasonic transducer

Details Capacitance-type ultrasonic transducer Capacitance-type ultrasonic transducer

1994-04-22

1995-08-15

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

381174, 381191, H04R 1900

Patent

active

054425956

ABSTRACT:
A capacitance-type ultrasonic transducer is disclosed in which a thin insulating plastic film or membrane is coated on one side with a thin film conductor, such as gold, and the back or counter electrode is comprised of a gas permeable conductor material such as sintered bronze. Springs are utilized to apply pressure to maintain good electrical contact between the gold film side of the membrane and an annular conductor. Signals are applied to and taken off of the gas permeable conductor backplate. Due to the porous structure of the back electrode and the gas permeability thereof, variations in ambient presure on the membrane or film are equalized. Ranges of operating freqeuncy can be established by size of particles used to form the sintered electrode.

REFERENCES:
patent: 3373251 (1968-03-01), Seeler
patent: 3787642 (1974-01-01), Young, Jr.
patent: 4081626 (1978-03-01), Muggli et al.
patent: 4142073 (1979-02-01), Agneus et al.
patent: 4790021 (1988-12-01), Pribyl
patent: 5121627 (1992-06-01), D'Aoust
patent: 5315877 (1994-05-01), Park et al.

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