Microphone

A capacitor microphone including a unit case having a front face, a back face, and side faces;

• an impedance transducer or impedance converter disposed in a lower portion of said unit case;
• a fixed pole having a front face, a back face, and a side face, said fixed pole being disposed in a front portion of said unit case, the fixed pole being electrically connected to said impedance transducer;
• a diaphragm extended over said fixed pole, said diaphragm vibrating by the electric acoustic energy of propagating external sound;
• opposite side faces of the unit case having an edge portion at lower portion thereof, the edge portion begin formed with a U-shaped bend;
• a circuit board having a front face, a back face and side faces, the back face of the circuit board being supported by the U-shaped edges of the unit case;
• an impedance transducer mounted on said circuit board;
• a support member extending from the front face of said circuit board forward, and contacting an inner face of side faces of the unit case, the support member having a concavity at the top end so that said fixed pole fits in the concavity, a top end face of the support member being at the same level as a front face of the fixed pole;
• a holder ring for holding said diaphragm on a back face thereof, a first elastic member mounted between the back face of the unit case and the front face of the holder ring;
• a second elastic member mounted between the back face of the diaphragm and the top end face of the support member or the front face of the fixed pole;
• and a third elastic member mounted between the back face of the circuit board and the end of the U-shaped edge.