| 摘要 |
An electret condenser microphone is provided to improve an acoustic property by sealing between a case and a PCB(Printed Circuit Board) with a sealing pad. A pair of a diaphragm and a backplate face each other with interposing a spacer therebetween. A conductive base conducts the diaphragm. An insulating base insulates the backplate and the conductive base. A pole ring conducts the diaphragm. A metal case(102) has the shape of a box, and one surface thereof is opened so as to insert the diaphragm, the backplate, the conductive base, the insulation base, and the pole ring into the inside thereof. The corners of curling surfaces(102c) of the case are chamfered. A PCB(Printed Circuit Board) mounts circuit parts thereon, and has a conductive pattern and a protruded connection terminal. A sealing pad is mounted on the insulating base to seal between the metal case and the PCB. |
