Electret transducer

Details Electret transducer Electret transducer

1981-07-13

1983-12-06

Rubinson, G. Z.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

181184, 181186, 307400, H04R 1900, H04R 128

Patent

active

044195451

ABSTRACT:
An electret transducer comprising a diaphragm (3) arranged between first (1 or 1') and second electrodes with at least one electrode (2) arranged at some distance from the diaphragm as a stationary electrode formed with holes (5). An air gap (4) is formed between the diaphragm (3) and said electrode (2). In the case of one air gap the air gap width d and the area A (7) enclosed by four holes which are situated nearest each other in said electrode (2) are selected so that the following equation is satisfied ##EQU1## where .eta. is the dynamic viscosity of the air in the air gap. In the case of an air gap on each side of the diaphragm, the air gap widths d.sub.1 and d.sub.2 and the said areas A.sub.1 and A.sub.2 are selected to satisfy the equation ##EQU2##

REFERENCES:
patent: 3833770 (1974-09-01), Atoji et al.
Leo L. Beranek, Acoustics, (McGraw Hill, New York, 1954), p. 134.
Paul M. D'Amico and Philip Kuhn, "Three New Noise Cancelling Electret Communication Devices", J. Audio Eng. Soc., vol. 24, p. 118, (Mar. 1976).

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