| 摘要 |
An electret condenser microphone is provided that allows a reduction in the thickness of an electronic device to which it is installed. The electret condenser microphone has a circuit board (2), a spacer (8; 8 and 9) and a diaphragm (7), which are successively layered, and a cup-shaped shield casing (85) covering the layered members. A sound hole (10a) is provided to extend from the outer surface of the circuit board (2) through the spacer to communicate between a space formed between the diaphragm and an end wall of the shield casing and the outside of the electret condenser microphone.
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