EP 1072168 A1 20010131 - SHORTING RINGS IN DUAL-COIL DUAL-GAP LOUDSPEAKER DRIVERS
Title (en)
SHORTING RINGS IN DUAL-COIL DUAL-GAP LOUDSPEAKER DRIVERS
Title (de)
KURZSCHLUSSRINGE FÜR LAUTSPRECHERANTRIEB MIT DOPPELSPULEN UND DOPPELSPALTEN
Title (fr)
ANNEAUX DE MISE EN COURT-CIRCUIT POUR CIRCUITS D'ATTAQUE DE HAUT-PARLEURS A DEUX BOBINES ET A DEUX ENTREFERS
Publication
Application
Priority
- US 9906084 W 19990319
- US 7862398 P 19980319
Abstract (en)
[origin: WO9948329A1] Loudspeakers and other transducers of the dual-voice-coil/dual-magnetic-gap type can be improved by the addition of one or more annular shorting rings (16A-16S) strategically located in the vicinity of the two magnetic gaps. The shorting rings have no effect on a steady state magnetic field but act in opposition to any change in flux density or any displacement of the flux lines such as those that occur under the loading imposed when the voice coils (10A, 10B) are driven hard with audio frequency current. Thus a plurality of rings can be strategically deployed at different locations so as to optimally suppress both even and odd order harmonic distortion and to reduce the voice coil inductance.
IPC 1-7
IPC 8 full level
H04R 9/02 (2006.01); H04R 9/06 (2006.01); H04R 9/00 (2006.01)
CPC (source: EP)
H04R 9/025 (2013.01); H04R 2209/022 (2013.01); H04R 2209/041 (2013.01)
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)
WO 9948329 A1 19990923; AT E414395 T1 20081115; AU 3194199 A 19991011; CA 2324394 A1 19990923; CA 2324394 C 20060207; CN 1152601 C 20040602; CN 1298622 A 20010606; DE 69939898 D1 20081224; EP 1072168 A1 20010131; EP 1072168 A4 20060208; EP 1072168 B1 20081112; JP 2002507873 A 20020312; JP 3574403 B2 20041006
DOCDB simple family (application)
US 9906084 W 19990319; AT 99913989 T 19990319; AU 3194199 A 19990319; CA 2324394 A 19990319; CN 99805485 A 19990319; DE 69939898 T 19990319; EP 99913989 A 19990319; JP 2000537404 A 19990319