Shorting rings in dual-coil dual-gap loudspeaker drivers

Details Shorting rings in dual-coil dual-gap loudspeaker drivers Shorting rings in dual-coil dual-gap loudspeaker drivers

H - Electricity

04

R

H04R 25/00 (2006.01) H04R 9/02 (2006.01) H04R 9/04 (2006.01) H04R 9/06 (2006.01)

Patent

CA 2324394

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.

Des haut-parleurs et d'autres transducteurs du type à deux bobines mobiles/à deux entrefers peuvent être améliorés par l'ajout d'un ou plusieurs anneaux de mise en court-circuit (16A-16S), placés de manière stratégique à proximité des deux entrefers. Ces anneaux de mise en court-circuit ne produisent aucun effet sur un champ magnétique à régime permanent, mais agissent de manière à s'opposer à toute variation de la densité du flux ou à tout déplacement des lignes de flux pouvant être provoqués par la charge appliquée lorsque les bobines mobiles (10A, 10B) sont attaquées par un courant basse fréquence. Plusieurs anneaux peuvent donc être déployés sur divers emplacements, de manière à supprimer le plus efficacement possible la distorsion harmonique d'ordre pair et d'ordre impair, et à réduire l'inductance de la bobine mobile.

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