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JPS5885897

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DESCRIPTION JPS5885897
[0001]
Brief description of the drawings
[0002]
FIG. 1 is a cross-sectional view of a conventional directional electret condenser microphone, FIG.
It is a sectional view of a condenser microphone. DESCRIPTION OF SYMBOLS 2 ... Case, 6 ... back
electrode, 8 ... board | substrate, 9 ... Element for electric impedance conversion, 10 ... Acoustic
resistance material. Correction Aki 57. 3.18 Correct the scope of the utility model registration
request as follows. O Practical model registration claim 1 A directional electret condenser
microphone provided with an acoustic resistance material whose outer periphery is covered by a
case, a holding portion of the back electrode is formed on the upper surface, and the lower
surface is in close contact with the substrate. 2. The directional electret condenser microphone
according to claim 1, wherein the acoustic resistance material is made of a porous resin. 3. The
directional electret condenser microphone according to claim 1 or 2, wherein the acoustic
resistance material has a housing portion of the element for converting electrical impedance. 4.
The directional electret condenser microphone according to claim 1, wherein the acoustic
resistance material is made of porous ceramic obtained by sintering ceramic particles.
04-05-2019
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