| 摘要 |
PROBLEM TO BE SOLVED: To provide an electret condenser microphone wherein a conductive member stably supports a rear face electrode plate and deterioration in the sensitivity due to occurrence of stray capacitance is minimized. SOLUTION: The conductive member 20 for electrically interconnecting a conductive layer 44D formed on an upper side of a circuit board 24 and the rear face electrode plate 18 is arranged in a way of elastically pressing the rear face electrode plate 18 between the rear face electrode plate 18 and the circuit board 24. The conductive member 20 comprises: a central projection 20A a tip part 20a of which is pressed into contact with the conductive layer 44D nearly in the center of the rear face electrode plate 18; an outer circumferential annular part 20B formed to concentrically surround a base end of the central projection 20A and pressed into contact with the outer circumferential part of the rear face electrode plate 18; and three elastic arms 20C connecting the outer circumferential annular part 20B and the central projection 20A. Thus, the ratio of parts of the conductive member 20 located at positions close to a metallic case 12 is minimized. COPYRIGHT: (C)2006,JPO&NCIPI
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