Title:
ELECTROSTATIC ACOUSTIC DEVICE
Document Type and Number:
WIPO Patent Application WO2002028142
Kind Code:
A3
Abstract:
In order to enhance the sound pressure of loudspeakers there is provided an electrostatic acoustic device having a first electrode (6) for applying an electrical field, a diaphragm (8) with a main portion, a peripheral portion and an elastic portion (9) between the main portion and the peripheral portion and fixing means (10) for fixing the peripheral portion of the diaphragm (8) to the first electrode(6), wherein the main portion of the diaphragm (8) is movable by the electrical field and wherein the elastic portion (9) of the diaphragm (8) is deformed during movement of the diaphragm (8), whereas the shape of the main portion of the diaphragm (8) is essentially maintained, when substantially constant surface force is applied to the entire surface of the diaphragm (8) by the electrical field.
Inventors:
KIM GEUK YEON (KR)
Application Number:
PCT/EP2001/011212
Publication Date:
September 19, 2002
Filing Date:
September 27, 2001
Export Citation:
Assignee:
THOMSON LICENSING SA (FR)
KIM GEUK YEON (KR)
KIM GEUK YEON (KR)
International Classes:
H04R19/00; (IPC1-7): H04R19/00
Foreign References:
| US5471540A | 1995-11-28 | |||
| DE19641503A1 | 1998-05-20 | |||
| US3892927A | 1975-07-01 | |||
| EP0616485A1 | 1994-09-21 | |||
| NL9400923A | 1996-01-02 |
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