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JPS5885891

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DESCRIPTION JPS5885891
[0001]
Brief description of the drawings
[0002]
1 is a sectional view of a conventional electret condenser microphone, FIG. 2 is a sectional view
of an electret condenser microphone in one embodiment of the present invention, and FIG. 3 is a
sectional view of an electret condenser microphone in another embodiment. FIG. 8 is a crosssectional view of the main part of an electret condenser microphone in still another embodiment.
6 ... back electrode, 7 ... insulator, 9 ... electric impedance conversion element, 10 ... acoustic
resistance material, 2a, 7a. fia ... back hole. Figure 3 Figure 4
04-05-2019
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