Electret transducer backplate, electret transducer and method of

Details Electret transducer backplate, electret transducer and method of Electret transducer backplate, electret transducer and method of

1978-11-28

1981-02-03

Canney, Vincent P.

29594, H04R 1900, H04R 3100

Patent

active

042490430

ABSTRACT:
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.

REFERENCES:
patent: 2159628 (1939-05-01), Danielson
patent: 3787642 (1974-01-01), Young, Jr.
patent: 3991285 (1976-11-01), Van Den Worm et al.
patent: 4014091 (1977-03-01), Kodera et al.
patent: 4042438 (1977-08-01), Kawakami et al.
IEEE Trans. Audio & Electroacoustics, vol. AU-19, No. 1, Mar. 1971, "Electret Transducers Applied to the Telephone", C. W. Reedyk, pp. 1-5.

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