Patent ID: 8218806
Filing Date: 2012-07-10
Classification: H04M,H04R

Abstract:
1. A unidirectional condenser microphone unit in which an acousto-electric converter configured so that a diaphragm and a backplate are arranged opposedly via an electrical insulating spacer 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 permeable shielding member which covers the rear acoustic terminal from the inside is provided in the unit case, wherein as the shielding member, a shielding plate consisting of a band-shaped and elastic porous metal plate, which has a length longer than the inner periphery length of the unit case, and is provided with a plurality of tongue pieces divided by a slit parallel with the lengthwise direction in both end parts in the lengthwise direction, is used; and the shielding plate is disposed in the unit case in a state in which the shielding plate is formed in a cylindrical shape by overlapping the tongue pieces in both the end parts alternately.