| 摘要 |
PROBLEM TO BE SOLVED: To provide an electret capacitor microphone which dispenses with cutting process of an FEP film, one of factors raising a cost, and has a reduced thickness of an electret layer to improve sensitivity. SOLUTION: A manufacturing method of an electret capacitor microphone of a front electret method is provided in which a capacitor part comprises a diaphragm, a front surface part of a capsule provided in front of the diaphragm, and an electret layer formed on the rear surface of the front surface part. The process for forming the electret layer 5 comprises a process where an FEP solvent 100 is partially applied on the rear surface of a brass plate 200 which is a material for the capsule, a process where the brass plate 200 is sintered, a process where an FEP thin film 50 resulting from the sintering process is polarized to form the electret layer 5, and a process where the brass plate 200 is drawn into a desired capsule.
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