H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/67
H04R 19/01 (2006.01) H04R 1/22 (2006.01) H04R 19/02 (2006.01)
Patent
CA 1173552
ABSTRACT OF THE DISCLOSURE An electret transducer comprising a diaphragm and a first and a second electrode, the electrodes being arranged one on each side of the diaphragm. At least one electrode is arranged at some distance from the diaphragm as a stationary electrode which is formed with holes so that at least one air gap is formed between the diaphragm and one electrode. In the case of a single air gap the air gap width d and the area A enclosed by four holes which are situated nearest each other in the electrode should be selected so that the following equation is satisfied Image where n 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 d1 and d2 and the areas A1 and A2 enclosed by the holes should be selected so that the following equation is satisfied Image
382805
Fetherstonhaugh & Co.
N.v. Philips Gloeilampenfabrieken
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