Capacitive transducer

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

Reexamination Certificate

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Reexamination Certificate

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06944308

ABSTRACT:
A capacitive transducer, in particular a condenser microphone, with a ring-shaped member and a diaphragm secured to the ring-shaped member. A disc-shaped member is secured in the opening of the ring-shaped member and in parallel relationship to the diaphragm. The disc-shaped member has an electrically conductive portion spaced from the ring-shaped member and facing the diaphragm in a predetermined distance therefrom, whereby the diaphragm and the electrically conductive portion on the disc-shaped member form an electrical capacitor. The second side of the disc-shaped member and the contact member are directly accessible. Also, the ring-shaped member has, outside the outer periphery of the diaphragm, a free surface extending transversally to the axis of the ring-shaped member for mounting in a microphone housing with the diaphragm flush with the front end of the microphone or slightly recessed relative to the front end.

REFERENCES:
patent: 3588382 (1971-06-01), Reedyk
patent: 3991285 (1976-11-01), Van Den Worm et al.
patent: 4268725 (1981-05-01), Nakagawa et al.
patent: 4443666 (1984-04-01), Cote
patent: 4582961 (1986-04-01), Frederiksen
patent: 5126614 (1992-06-01), Fujita et al.
patent: 5854846 (1998-12-01), Beavers
patent: 6169810 (2001-01-01), van Halteren et al.
patent: 43 29 993 (1995-03-01), None
patent: 146770 (1983-12-01), None
patent: 0 371 620 (1990-06-01), None
patent: 1 599 373 (1981-09-01), None
patent: 2 112 605 (1983-07-01), None

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