Importance

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Abstract

An electret capacitor microphone is constituted by a surface conductive diaphragm, a fixed electrode provided opposite to the diaphragm at a regular interval and a solid state device for converting, into an electric signal, a voice given to the diaphragm with a change in an electrostatic capacity between the diaphragm and the fixed electrode. The microphone comprises a dielectric casing having a bottomed hollow portion for accommodating the diaphragm, the fixed electrode and the solid state device. Since the casing itself is dielectric, it does not deed to accommodate a special dielectric or a board for the solid state device but can be directly provided in the hollow portion. Therefore, the microphone can be very small-sized and thinned. The hollow portion of the casing has a stepped portion and the diaphragm or the fixed electrode is fixed onto the stepped portion. The hollow portion of the casing has a rectangular cross section and the external shape of the casing is rectangular, the parts can easily be provided in the hollow portion, an unnecessary space can be omitted, and a size can be reduced.

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First Claim