| 摘要 |
The present invention includes a variable directional capacitor microphone in which two capacitor elements are combined. Each of the capacitor elements includes a vibrating plate and a fixed electrode, and an acoustic resistance can be adjusted in the state that the microphone has been assembled. The variable directional capacitor microphone of this invention includes capacitor elements 10 a, 10 b. In each of the capacitor elements 10 a, 10 b, each of vibrating plate supporting members 12 a, 12 b, each of spacer rings 13 a, 13 b, each of fixed electrodes 14 a, 14 b having through holes 141 and each of pedestals 15 a, 15 b having a through hole in each center of the pedestals are assembled in this order, respectively, in each of ring-shaped cases 16 a, 16 b. Each of vibrating plates 11 a, 11 b is strained and fixed on each of vibrating plate supporting members 12 a, 12 b, respectively. The capacitor elements 10 a, 10 b are combined through a connecting ring 22 having female screw threads 221 with the pedestal 15 a, 15 b facing back-to-back. An elastic acoustic resisting member 31 is disposed between the pedestals 15 a, 15 b. The acoustic resistance of the acoustic resisting member 31 can be adjusted with the lengths of thread engagement of the pedestals 15 a, 15 b with the connecting ring 22.
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