| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of noise caused by external electromagnetic waves and also prevent a high voltage from being generated in a microphone case, so that the risk of an electrical shock is eliminated. SOLUTION: The condenser microphone comprises: a microphone case (shield case) 10 including a circuit board 11 having a ground circuit 13 and an electronic circuit 12 for a condenser microphone unit MU; and a 3-pin output connector 20 which is mounted on the microphone case 10 and connected to a microphone cable 30 from an external power unit (for example, a phantom power source), the output connector 20 including a first grounding pin connected to the ground circuit 13 and the microphone case 10, wherein the ground circuit 13 and the microphone case 10 are electrically connected at multiple points via conductive connecting means 40, which can be brought into surface contact, to prevent a ground loop current path caused by a stray capacitance between the ground circuit 13 and the microphone case 10. COPYRIGHT: (C)2006,JPO&NCIPI |
