Electroacoustic transducer, process of producing the same...

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Microphone capsule only

Reexamination Certificate

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C381S191000

Reexamination Certificate

active

06870937

ABSTRACT:
An electroacoustic transducer comprises: a lower electrode; an upper electrode including an oscillation portion and a support portion for supporting the oscillation portion at least at a part of a periphery of the oscillation portion; and an insulating layer for insulating the lower electrode from the upper electrode, wherein the upper electrode has an up and down in the oscillation portion and/or in the support portion to provide a cavity between the upper electrode and the lower electrode.

REFERENCES:
patent: 5303210 (1994-04-01), Bernstein
patent: 5452268 (1995-09-01), Bernstein
patent: 5889872 (1999-03-01), Sooriakumar et al.
patent: 04127479 (1992-04-01), None
patent: 07-333077 (1995-12-01), None
patent: 11-266499 (1999-09-01), None
patent: 2001-518246 (2001-10-01), None
patent: 8403410 (1984-08-01), None

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