ELECTRET CONDENSER MICROPHONE

摘要

An electret capacitor microphone, comprising a substrate (13) having an opening part (25), an electret capacitor (50) connected to one face of the substrate (13) so as to close the opening part (25) and having sound holes (12) and a hollow hole (2), a drive circuit element (15) connected to one face of the substrate (13), and a case (17) installed on the substrate (13) so as to cover the electret capacitor (50) and the drive circuit element (15). Electric contact between the electret capacitor (50) and the substrate (13) is formed at a connected portion therebetween. The sound holes (12) are connected to an external space through the opening part (25). The hollow hole (2) and the internal area of the case (17) form an air chamber at the rear of the electret capacitor (50).