| 摘要 |
PROBLEM TO BE SOLVED: To make electromagnetic shielding more reliable in a connecting part between a microphone body and a microphone capsule.SOLUTION: The condenser microphone includes: a microphone capsule 10 configured so that an electrostatic acoustic-electric converter is accommodated in a metallic capsule housing 11 and an extraction electrode 15 of a fixed pole 142 is disposed in substantially the central portion of a connection-side opening part 120; and a microphone body 20 configured so that a circuit board 22 is disposed at a prescribed depth position in a connection-side opening part 210 of a metallic microphone housing 21 to which the capsule housing 11 is detachably connected, and a field effect transistor 23 and a conductive contacting means for connecting the gate of the field effect transistor to the extraction electrode 15 are disposed on the circuit board 22. The extraction electrode 15 is connected to the gate of the field effect transistor 23 via the conductive contacting means with the connection between the capsule housing 11 and the microphone housing 21. In this case, a conductive elastic material 31 comprising a conductive resin foam or a conductive cloth is used as the conductive contacting means, and a ferrite material 32 is disposed on the circuit board 22 so as to surround the conductive elastic material 31. |
