US Patent 7168965 Condenser microphone

A condenser microphone includes a microphone case formed by a metallic cylindrical body and having a three-pin output connector in a connector housing section, and a connection plug having a balanced shielded cable connected to the three-pin output connector by inserting into the connector housing section. The connection plug is provided with a metallic outer ring electrically connected to a shield coated line of the balanced shielded cable, and contacts the inner surface of the connector housing section. A contactor for grounding is formed of a plate spring material to elastically and electrically contact with the outer ring of the connection plug. The contactor is provided on the inner surface side of the connector housing section. Thus, high frequency impedance in a connecting portion between the microphone case and the connection plug on the output cable side is reduced, by which generation of noise due to electromagnetic waves is prevented.