| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a condenser microphone unit capable of avoiding the generation of resonance. <P>SOLUTION: An elastic acoustic resistance material 52 is disposed closely and peripherally in a gap G inevitably left when an internal unit 42 is stored in a case body 22 having an internal diameter larger than a maximum external diameter of the internal unit 42. The gap G has a reactance component minimized, and then does not form a resonance circuit even if coupled to a gap Ga formed between front meshes 32 and a diaphragm ring 43, so that the condenser microphone unit 11 is enabled to avoid the generation of resonance. Further, measures against an influence of resonance which are taken by individual products become unnecessary and the condenser microphone unit 11 can be mass-produced without causing a variation in directional frequency resonance. <P>COPYRIGHT: (C)2008,JPO&INPIT |
