Electret transducer backplate, electret transducer and...

Details Electret transducer backplate, electret transducer and... Electret transducer backplate, electret transducer and...

H - Electricity

04

R

26/124, 349/67

H04R 17/00 (2006.01) H01G 7/02 (2006.01) H04R 7/18 (2006.01) H04R 19/00 (2006.01) H04R 31/00 (2006.01)

Patent

CA 1126851

ABSTRACT OF THE DISCLOSURE An electret transducer backplate is made of a thermo-softening plastics material rendered electrically conducting by electrically conducting particles distributed therethrough. An electret foil diaphragm is mounted on the backplate and the relative flexural rigidities of the diaphragm and the backplate are such that, in use, the deflection of the diaphragm is at least twenty times as great as the deflection of the backplate. A method of making the transducer involves heating an electret foil, bonding the electret foil to a retaining ring while the foil is hot and securing together the retaining ring and the backplate.

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