| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrostatic transducer capable of increasing sensitivity and output sound pressure as compared with the conventional when using the electrostatic transducer as acoustic and pressure sensors and as a speaker, respectively. SOLUTION: A fixing plate 4 has a fixed electrode 7. A movable plate 5 opposing the fixing plate 4 via a gap G for arrangement has a movable electrode 8. The fixing plate 4 has a through hole 10 passing in a thickness direction. The movable plate 5 has an oscillation section 11 opposing the fixing plate 4 in the thickness direction of the fixing plate 4, and a projection section 12 that projects from a surface at the side of the fixing plate 4 at the oscillation section 11 and is partially inserted into the through hole 10 in an initial state before at least the oscillation section 11 oscillates. The movable electrode 8 is provided from the oscillation section 11 to the projection section 12. The fixed electrode 7 integrally has a portion along an opposite surface to the oscillation section 11 on the fixing plate 4 and a portion along the inner side of the through hole 10. COPYRIGHT: (C)2009,JPO&INPIT
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