Integrated capacitive transducer

Details Integrated capacitive transducer Integrated capacitive transducer

1984-01-20

1985-12-10

Brown, Thomas W.

29594, H04R 2302

Patent

active

045581843

ABSTRACT:
Disclosed is an electroacoustic transducer, such as a microphone, which may be integrated into a semiconductor chip and a method of fabrication. The semiconductor is etched to produce a membrane having a sufficiently small thickness and an area so as to vibrate at audio frequencies. Electrodes are provided in relation to the membrane so that an electrical output signal can be derived from the audio frequencies, or vice versa, due to variable capacitance. Preferably, the sensitivity of the device is made to be an approximately linear function of sound pressure level to be compatible with amplification.

REFERENCES:
patent: 4070741 (1978-02-01), Djuric
patent: 4261086 (1981-04-01), Giachino
patent: 4321432 (1982-03-01), Matsutani
patent: 4415948 (1983-11-01), Grantham
patent: 4495385 (1985-01-01), Roberts

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