Hosiden Corporation

Hideki Kozawa

Toshiro Izuchi

Hiroshi Yamagata

Naosuke Fukada

Affixed in intimate contact to the inside surface of a front boardof a conductive capsuleprovided with a receiving sound apertureis a conductive back electrode board provided with air vent apertureswhich are positioned not in alignment with the receiving sound aperture, these aperturesandbeing connected by a slitA polarized FEP filmwhich is an electret film is disposed on the surface of the back electrode boardopposite from the front board 10, and a conductive diaphragmis disposed on the surface of the FEPopposite from the back electrode boardwith a spacerinterposed therebetween which extends around the outer periphery of the opposite surface of the FEPThese component parts are accommodate in the capsuleto constitute an electret condenser microphone which is capable of suppressing sensitivity degradation due to ingress of grit from the outside to the electret film.

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Dusseldorf, Germany

Hideki Kozawa