Miniaturized unidirectional electret microphone

Details Miniaturized unidirectional electret microphone Miniaturized unidirectional electret microphone

1979-09-21

1981-07-28

Robinson, Thomas A.

179110A, H04R 1904

Patent

active

042812224

ABSTRACT:
An electret diaphragm is housed in a case, a back electrode is disposed opposite the back of the electret diaphragm, a damper cloth is disposed in contact with the back of the back electrode, and a terminal plate is placed behind the damper cloth and connected with the back electrode. The back electrode, the damper cloth and the terminal plate are held by a tubular back electrode holder. The back of the back electrode holder is closed by a printed circuit board to define a rear compartment in the back electrode holder, and an impedance converter is disposed in the rear compartment. A sound hole is made for intercommunication of the rear compartment with the outside to achieve unidirectional directivity.

REFERENCES:
patent: Re28420 (1975-05-01), Murphy
patent: 4063049 (1977-12-01), Pipitone et al.
patent: 4081628 (1978-03-01), Neusel

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