Semiconductor electret capacitor microphone

Details Semiconductor electret capacitor microphone Semiconductor electret capacitor microphone

2005-03-22

2005-03-22

Ni, Suhan (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Microphone capsule only

C381S113000, C381S191000

Reexamination Certificate

active

06870938

ABSTRACT:
A semiconductor electret capacitor microphone includes a vibration membrane, a semiconductor chip on which are formed a necessary electronic circuit, a fixed electrode, a spacer for preserving a predetermined space between the fixed electrode and the vibration membrane, and a case for enclosing the semiconductor chip and the vibration membrane in such a configuration that the fixed electrode is connected to the ground and the vibration membrane is connected to an input electrode of the semiconductor chip.

REFERENCES:
patent: 3775572 (1973-11-01), Ishibashi et al.
patent: 3786495 (1974-01-01), Spence
patent: 3835264 (1974-09-01), Overby
patent: 4993072 (1991-02-01), Murphy

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