Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only
Reexamination Certificate
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
Ohbayashi Yoshiaki
Saeki Shinichi
Takeuchi Takanobu
Yasuda Mamoru
Armstrong Kratz Quintos Hanson & Brooks, LLP
Hosiden Corporation
Mitsubishi Denki & Kabushiki Kaisha
Ni Suhan
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