| 摘要 |
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 member 40 for the rear acoustic terminal is provided in the unit case, as the shielding member 40, a shielding plate 42 consisting 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 pieces 42R1 to 42R3 and 42L1 to 42L3 divided by slits 421 parallel with the lengthwise direction in both end parts 42R and 42L in the lengthwise direction, is used; and the shielding plate 42 is disposed in the unit case 10 in the state in which the shielding plate 42 is formed in a cylindrical shape by overlapping the tongue pieces 42R1 to 42R3 and 42L1 to 42L3 in both the end parts 42R and 42L alternately. |
