EP 1194004 A1 20020403 - Electrostatic acoustic device
Title (en)
Electrostatic acoustic device
Title (de)
Elektrostatische akustische Vorrichung
Title (fr)
Dispositif acoustique électrostatique
Publication
Application
Priority
EP 00402687 A 20000929
Abstract (en)
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. <IMAGE>
IPC 1-7
IPC 8 full level
H04R 19/00 (2006.01)
CPC (source: EP)
H04R 19/00 (2013.01)
Citation (search report)
- [AD] US 5471540 A 19951128 - MAEDA KEIJIRO [JP]
- [AD] DE 19641503 A1 19980520 - GERKINSMEYER NORMAN [DE], et al
- [A] US 3892927 A 19750701 - LINDENBERG THEODORE
- [A] EP 0616485 A1 19940921 - SCHMID WALTER [IN]
- [A] NL 9400923 A 19960102 - RUIJTENBERG CORNELIS [NL]
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 1194004 A1 20020403; AU 1228802 A 20020408; WO 0228142 A2 20020404; WO 0228142 A3 20020919
DOCDB simple family (application)
EP 00402687 A 20000929; AU 1228802 A 20010927; EP 0111212 W 20010927