CAPACITOR MICROPHONE Russian patent published in 1996 - IPC

FIELD: electroacoustics. SUBSTANCE: microphone has case, conducting membrane, and flat conducting electrode deposited onto central disk of supporting member made of insulating material; central disk of supporting member and annular surface of the latter surrounding this disk are on the same plane and isolated from each other by internal annular recess; conducting membrane rests on annular surface through gasket, locating and adjusting washers embracing annular surface of supporting member and arranged in external annular recess of supporting member. Membrane is fixed on locating washer; adjusting washer is placed between locating washer and annular surface of supporting member formed by external annular recess. Annular-surface gasket is made of material whose coefficient of linear expansion is twice as high as that of supporting member. Provision is made for replacing adjusting washer by similar one of other thickness to ensure desired tension of membrane. EFFECT: improved design. 3 cl, 1 dwg