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Title:
UNIDIRECTIONAL CONDENSER MICROPHONE UNIT
Document Type and Number:
Japanese Patent JP2005244427
Kind Code:
A
Abstract:

To provide a unidirectional condenser microphone unit wherein howling is scarce.

In the unidirectional condenser microphone unit, wherein a diaphragm 20 stretched to a support ring 21 and a fixed pole 30 supported by an insulation seat 50 are arranged via a spacer ring 40 opposite to each other and a rear air chamber 31, is provided between the fixed pole 30 and the insulation seat 50, the stiffness s1 of the rear air chamber 31, expressed by (ρ×c2×S2)/V, where ρ is the density of air, c is the sound velocity, S is the effective vibrating area of a diaphragm 20, and V is the volume of the rear air chamber 31, is increased on the basis of the value of the volume V so as to shift the resonance frequency of the omnidirectional component included in the unidirectivity up to a frequency around a high-frequency reproduction limit.


Inventors:
AKINO YUTAKA
KONDO KAZUHISA
TAKAYAMA TORAHOSHI
Application Number:
JP2004000049409
Publication Date:
September 08, 2005
Filing Date:
February 25, 2004
Export Citation:
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Assignee:
AUDIO TECHNICA KK
International Classes:
H04R1/38; H04R5/00; H04R9/08; H04R11/04; H04R19/04; (IPC1-7): H04R19/04; H04R1/38
Attorney, Agent or Firm:
大原 拓也