Unidirectional condenser microphone unit

Abstract

There is provided a unidirectional condenser microphone unit in which the shield performance of a rear acoustic terminal is assured by simple assembling work without an increase in cost. In a unidirectional condenser microphone unit in which an electrostatic acousto-electric converter is incorporated in a cylindrical, metallic unit case having a front acoustic terminal on the front surface thereof and a rear acoustic terminal on the side surface thereof, and a shielding memberfor the rear acoustic terminal is provided in the unit case, as the shielding member, a shielding plateconsisting of a band-shaped and elastic porous metal plate, which has a length La longer than the inner periphery length of the unit case, and is provided with a plurality of tongue piecesRtoRandLtoLdivided by slitsparallel with the lengthwise direction in both end partsR andL in the lengthwise direction, is used; and the shielding plateis disposed in the unit casein the state in which the shielding plateis formed in a cylindrical shape by overlapping the tongue piecesRtoRandLtoLin both the end partsR andL alternately.