Patent ID: 7352873

Claim:
An electret-condenser microphone comprising: a vibrating diaphragm and a back electrode which compose a condenser; a cylindrical case which houses the vibrating diaphragm and the back electrode; a circuit board which is housed in an opening of the cylindrical case and covers the opening, and which is fixed to the opening by a crimp edge at an opening end of the cylindrical case that bends inwardly; and a substrate fastened to an outer surface of the circuit board, wherein terminal electrode patterns are formed on the outer surface of the circuit board, first substrate electrode patterns are formed on a surface of the substrate which is opposite the circuit board and serves as a reflow-soldering surface, the terminal electrode patterns and the first substrate electrode patterns are connected with each other via first thru-holes in the substrate, and second thru-holes are formed in an area of the surface of the substrate where the first substrate electrode patterns are not formed and which connect a space enclosed by the circuit board, substrate and electrode patterns formed between the circuit board and the substrate with space that is external to the electret-condenser microphone.