Single directivity electrostatic microphone unit and close-talking electrostatic microphone

摘要

PROBLEM TO BE SOLVED: To provide a unidirectional capacitor microphone unit which exhibits an excellent directional frequency response, and in which a rear sound terminal is hardly exposed to an external electric field as a noise source even in any posture, and to provide a close-talking capacitor microphone using the same.;SOLUTION: The unidirectional capacitor microphone unit includes a diaphragm 11, a diaphragm holder 6 to which the diaphragm 11 is fixed, a fixed electrode 6, a printed circuit board 10, an insulation seat 7 provided to the back side of the fixed electrode 6, and a unit case 3, wherein the printed circuit board 10 and insulation seat 7 form a rear sound terminal formed of at least one hole. A both-side through hole plating 22 is applied to the hole of the printed circuit board 10 forming the rear sound terminal to electrically connect plating on both surfaces of the printed substrate 10 to a plating 23 on the peripheral wall of the hole of the printed circuit board 10, and conductive cloth 21 is fitted to the hole of the printed circuit board 10.;COPYRIGHT: (C)2011,JPO&INPIT