| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that the size of a diaphragm and the contour of a microphone are increased in order to overcome a distortion in the waveform caused by an undue sound pressure of the microphone. SOLUTION: The microphone comprises an enclosed container 13 having a hole 13a for introducing a sound, and a supporting part 15 for holding a diaphragm 11 receiving the pressure of the sound and a back plate 12 arranged in parallel with the diaphragm 11 in the enclosed container 13 through a predetermined air gap. The back plate 12 is coupled with a mechanoelectric transducer 14, and the outer surface of the hole 13a in the enclosed container 13 is covered with a porous film 17. Distortion in the waveform caused by an undue sound pressure of the microphone can thereby be eliminated easily without varying the contour of the microphone. COPYRIGHT: (C)2004,JPO
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