Electroacoustic transducer of the electret type

Details Electroacoustic transducer of the electret type Electroacoustic transducer of the electret type

1992-09-17

1993-10-19

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367181, 381174, 381191, H04R 1900

Patent

active

052552462

ABSTRACT:
An electroacoustic transducer of the electret type, comprising a case (101) having an opening (102) via which the interior of the case communicates with the surroundings; a backplate (105) and a diaphragm (107) arranged opposite the backplate in the case, the surface of the backplate being provided at least partly with an electret material (106) and at least a part of the surface of the diaphragm being provided with an electrically conductive layer (110); and an annular element (109) for securing the circumference of the diaphragm to the inside wall of the case. According to the invention, the parasitic capacity between the backplate (105) and the annular element (109) is eliminated in that the backplate and the annular element are both electrically connected with the case and thereby have the same potential as the case. This also provides production-technical advantages.

REFERENCES:
patent: 4063050 (1977-12-01), Carlson et al.
patent: 4730283 (1988-03-01), Carlson et al.

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