Global Patent Index - EP 1072168 A1

EP 1072168 A1 2001-01-31 - 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

EP 1072168 A1 (EN)

Application

EP 99913989 A

Priority

  • US 9906084 W
  • US 7862398 P

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 (main, further and additional classification)

H04R 25/00

IPC 8 full level (invention and additional information)

H04R 9/02 (2006.01); H04R 9/06 (2006.01); H04R 9/00 (2006.01)

CPC (invention and additional information)

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

EPO simple patent family

WO 9948329 A1 19990923; AT 414395 T 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

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