Electret capacitor microphone

Details Electret capacitor microphone Electret capacitor microphone

H - Electricity

04

R

H04R 19/01 (2006.01)

Patent

CA 2060542

An electret capacitor microphone (ECM) can be assembled by an automatic assembly machine, and has an excellent thermal resistance against the influence of heat during the assembly. The ECM includes a cylindrical metal gate ring which is to be subjected to a caulking force, instead of an insulator made of a resin having a lower thermal resistance. The ECM has an amplifier block consisting of a first assembly sub-block having a back-plate and the metal gate ring, and a second assembly sub-block having an FET and a printed circuit board so as to be assembled by an automatic assembly machine.

Cette invention concerne un microphone électret capacitif pouvant être assemblé par une machine automatique et présentant une excellente résistance à l'échauffement en cours d'assemblage. L'objet de l'invention comprend une rondelle métallique qui doit être soumise à une force de matage au lieu d'un isolateur en résine à résistance thermique plus faible. Il comporte un bloc amplificateur formé d'un sous-bloc de premier assemblage à plaque arrière et rondelle métallique et d'un sous-bloc de second assemblage à transistor à effet de champ et plaquette de circuit imprimé, qui se prêtent à l'assemblage par une machine automatique.

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