NARROW-ANGLE DIRECTIONAL MICROPHONE AND METHOD OF MANUFACTURING THE SAME

摘要

Excellent narrow-angle directivity is obtained by causing a microphone case main body to function as an acoustic tube, reducing a weight of a microphone, and suppressing leakage of sound waves from an inside of the acoustic tube to an outside. An acoustic tube microphone case includes a microphone case main body made of a metal tube having a plurality of openings formed in a peripheral surface, and acoustic resistance materials formed in a rectangular sheet manner, cylindrically rounded such that both right and left ends are mutually in contact, and arranged along an inner peripheral surface of the microphone case main body. A plurality of the acoustic resistance materials is layered, and at least the innermost acoustic resistance material applies a force in a developing direction by an elastic force thereof, and presses the outside acoustic resistance materials against the inner peripheral surface of the microphone case main body.

主权项

1. A narrow-angle directional microphone comprising:
a unidirectional microphone unit having a front acoustic terminal and a rear acoustic terminal; and an acoustic tube microphone case with an open distal end, having the microphone unit built in in a rear end, wherein the acoustic tube microphone case includes a microphone case main body made of a metal tube having a plurality of openings formed in a peripheral surface, and an acoustic resistance material formed in a rectangular sheet manner, rounded cylindrically to make both right and left ends come in contact with each other, and arranged along an inner peripheral surface of the microphone case main body, and a plurality of the acoustic resistance materials is layered, and at least the innermost acoustic resistance material applies a force in a developing direction with an elastic force of the innermost acoustic resistance material, and presses the outside acoustic resistance material against the inner peripheral surface of the microphone case main body.