| 摘要 |
A gooseneck microphone has a configuration capable of preventing both of the occurrence of noise caused by extraneous electromagnetic waves and the occurrence of noise caused by electric discharge when touched. The gooseneck microphone includes a microphone unit having an electrostatic acousto-electric converter and a metal unit casing; a unit holder having a circuit board mounted with an impedance converter electrically connected to an output side of the acousto-electric converter, a cylindrical outer cylinder body, a cylindrical inner cylinder body arranged in the outer cylinder body, and a synthetic resin cover member covering the outer cylinder body; a metal support pipe having flexibility, the unit holder being supported on one end side of the support pipe; and a microphone cable having a two-core shield covering cable and inserted through the support pipe, one end side of the microphone cable being brought into the unit holder. |
| 主权项 |
1. A gooseneck microphone, comprising:
a microphone unit having an electrostatic acousto-electric converter and a metal unit casing housing the electrostatic acousto-electric converter; a unit holder having
a circuit board mounted with an impedance converter electrically connected to an output side of the acousto-electric converter,a cylindrical outer cylinder body formed of a metallic material,a cylindrical inner cylinder body formed of a metallic material and arranged in the outer cylinder body, anda synthetic resin cover member having a cylindrical shape and covering the outer cylinder body; a metal support pipe having flexibility, the unit holder being supported on one end side of the support pipe; a resonator covering the unit casing so that an end of the unit casing protrudes downwards from an end of the resonator, the end of the resonator abutting against an upper end of the synthetic resin cover member outside the unit casing; a connecting ring disposed on the circuit board, and connecting the unit casing of the microphone unit and the outer cylinder body of the unit holder to each other; and a microphone cable having a two-core shield covering cable with a shield cover conductor, the microphone cable being inserted through the support pipe and one end side of the microphone cable being brought into the unit holder, wherein one end side of the outer cylinder body is fixed to the support pipe with electrical connection and the other end side thereof is connected to the unit casing of the microphone unit with electrical connection; one end side of the inner cylinder body is fixed to the shield cover conductor of the microphone cable with electrical connection, and the other end side thereof is mounted with the circuit board and is electrically connected to a ground pattern of the circuit board; and the synthetic resin cover member extends from a lower portion of the microphone unit, entirely covers the outer cylinder body and continues to the metal support pipe, and the microphone includes a first electrostatic shield system formed of the unit casing, the outer cylinder body and the support pipe, and a second electrostatic shield system formed of the ground pattern of the circuit board, the inner cylinder body and the shield cover conductor. |
