Unidirectional dynamic microphone unit
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United States of America Patent
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Jun 5, 2018
Issued Date -
Oct 19, 2017
app pub date -
Dec 20, 2016
filing date -
Apr 13, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
In a unidirectional dynamic microphone unit, a cylindrical tube is provided to cover the microphone unit, a cylindrical wall of a first cylindrical portion that is included in the cylindrical tube and extends to at least the rearward is provided with a rear sound wave introducing portion weighted such that an acoustic resistance value is gradually made smaller toward the rearward side from positions of sound holes for taking in a sound wave transmitting around from the rearward side, preferably formed of a trumpet-shaped opening, and it is possible to enhance the sensibility to sound pressures without degradation of the frequency response and the directionality.
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