摘要 |
PROBLEM TO BE SOLVED: To provide a condenser microphone where variation in cut-off frequencies is reduced at a low frequency region and a low cut-off frequency can be obtained by improving fluctuation in an acoustic resistance due to variation in the internal shape of a back pressure chamber and a communication hole. SOLUTION: A membrane 6 is used to close one opening of a housing member 1 that is a cylinder whose both ends are open, the inside of the cylinder of the housing member 1 are closed by insulation members 14, 15 forming an acoustic circuit to form a back pressure chamber 10. The acoustic circuit forms an external vent to the back pressure chamber 10.
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