Electret condenser microphone

Abstract

Disclosed is an electret condenser microphone which comprises a casing member including a circular inlet portion, and a cylindrical side portion integrally formed with the inlet portion of the casing member, the side portion of the casing member having a first section close to the inlet portion of the casing member, and a second section remote from the inlet portion of the casing member and radially inwardly bent, a printed circuit board in the form of a circular shape and disposed in the casing member to be held in contact with the second section of the side portion of the casing member, the casing member and the printed circuit board collectively forming a cylindrical casing space, an electrically connecting member intervening between the printed circuit board and the electrode plate to have the printed circuit board and the electrode plate electrically connected with each other, the electrically connecting member being partly disposed on and along the circumference of the printed circuit board, and a diaphragm located between the inlet portion of the casing member and the electrode plate to be spaced apart from the electrode plate at a predetermined space distance.

Description

technical field [0001] The present invention relates to an electret condenser microphone used in various audio equipment such as cellular phones, and more particularly to an electret condenser microphone equipped with a capacitor unit composed of an electrode plate and a vibrating membrane for receiving A sound wave converted into an acoustic signal representing the sound wave. Background technique [0002] Hitherto, various conventional electret condenser microphones have been proposed, each equipped with a capacitor unit composed of an electrode plate and a diaphragm for receiving sound waves to be converted into acoustic signals representing the sound waves. [0003] Heretofore, conventional electret condenser microphones of this type are applicable to various audio equipment such as cellular phones. exist Figure 11 with Figure 12 An example of a typical conventional electret condenser microphone is shown. The proposed conventional electret conden...

AI Technical Summary

Problems solved by technology

[0012] However, the conventional electret condenser microphone has encountered such a problem that its sensitivity to sound waves is reduced because the side portion 913 of the housing member 910 and the electrical connection plate member 950 together constitute a harmful capacitor unit, which A parasitic capacitance corresponding to the area of ​​the surface portion of the inner surface 913a of the side portion 913 of the housing member 910 opposite to the outer surface 950a of the electrical connection member 950 is generated.

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