Electret microphone

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element

Reexamination Certificate

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Details

C381S396000, C381S398000, C381S174000

Reexamination Certificate

active

06898292

ABSTRACT:
An electret microphone comprises a back plate having a stationary back electrode and secured to a substrate. An electret layer is formed on the stationary back electrode and a spacer is mounted on the back plate. A diaphragm electrode is mounted on the spacer.

REFERENCES:
patent: 5272758 (1993-12-01), Isogami et al.
patent: 2000197192 (2000-07-01), None

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