Electroacoustic transducer of the so-called "electret" type, and

Details Electroacoustic transducer of the so-called "electret" type, and Electroacoustic transducer of the so-called "electret" type, and

1988-10-27

1990-03-13

Kyle, Deborah L.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

367170, 381191, 381174, H04R 1900

Patent

active

049088050

ABSTRACT:
This invention provides an electroacoustic transducer and a method of making it. The transducer according to the invention comprises a substrate of a semiconductor material with a recessed portion. A membrane is stretched across the recessed portion, which membrane is set in vibration in response to an input signal comprising audio and/or ultrasonorous frequencies. A pair of electrodes is provided, which form a capacitor, and between which an electric field is present. The electrodes are so arranged relatively to the membrane that the capacitance of the capacitor can vary under the influence of vibrations of the membrane, so that acoustic signals are converted into electric signals. A layer of an electrically insulating material functions as a carrier for an electric charge to provide an auxiliary electric field between the electrodes. The transducer is characterized in that the peripheral edge of the substrate, which is raised relatively to the recessed portion, has a set of openings formed in it, each extending through the substrate. The membrane is attached through the openings to the peripheral edge.

REFERENCES:
patent: 4495385 (1985-01-01), Roberts et al.
patent: 4558184 (1985-12-01), Busch-Vishniac et al.
patent: 4567382 (1986-01-01), van Halteren
patent: 4621171 (1986-11-01), Wada et al.
patent: 4691363 (1987-09-01), Khanna

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