Patent ID: 8724839

Claim:
A unidirectional microphone comprising: a cylindrical capsule; a front plate blocking one end of the cylindrical capsule; a front plate sound hole formed in the front plate; a vibrating membrane and a rear pole plate that are housed in the cylindrical capsule and form capacitance; a substrate blocking another open end of the capsule; and a rear plate sound hole formed in the substrate; wherein: the front plate sound hole and the rear plate sound hole are placed on mutually opposite sides of a central axis of the capsule so as to be offset relative to the central axis, and many through holes are formed on a single circle on the front plate, a compensation cloth is attached to an outer surface of the front plate through a double-sided adhesive tape having a notch on a perimeter thereof, and one through hole of the many through holes that is aligned with the notch and not covered with the double-sided adhesive tape is used as the front plate sound hole.