Method and system for controlling the propagation of...

H - Electricity – 04 – R

Patent

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H04R 9/02 (2006.01)

Patent

CA 2307668

The aim of the invention is to improve the propagation of magnetic fields by electrodynamic/-magnetic transducers, especially in telecommunications devices, in such a way that the static magnetic fields generated by the transducers are essentially screened and the dynamic magnetic fields are essentially emitted unhindered. To this end, a magnetic cover which is essentially impermeable to the static magnetic fields of an electrodynamic/- magnetic transducer is used at least in the sound delivery area of the transducer. The cover is penetrated by a number of openings whose dimensions are such that the cover maintains a predetermined resistance and rigidity when provided with the openings compared to its original resistance and rigidity, so that it is still easy to assemble mechanically, so that the openings allow through a predetermined sound pressure level which can be produced by the transducer, and so that the openings physically limit eddy currents on the cover caused by dynamic magnetic fields of the transducer, thus preventing them from reaching their full strength.

L'invention a pour objet d'améliorer la propagation de champs magnétiques par des convertisseurs électrodynamiques/électromagnétiques, notamment dans les appareils de télécommunications de telle façon que les champs magnétiques statiques générés par les convertisseurs soient sensiblement limités par blindage et que les champs magnétiques dynamiques soient déployés sensiblement sans obstacle. Pour ce faire, un revêtement magnétique sensiblement imperméable aux champs magnétiques statiques d'un convertisseur électrodynamique/électromagnétique, est utilisé au moins dans la zone sortie son du convertisseur. Ce revêtement présente un certain nombre de trous pénétrants devant être dimensionnés de telle façon que le revêtement doté de ces trous ait par rapport à sa solidité ou sa rigidité initiales une solidité ou une rigidité prédéterminée qui permette encore son montage mécanique. Les trous laissent passer un niveau de pression sonore déterminé pouvant être produit par le convertisseur et limitent la propagation spatiale des courants de Foucault provoqués par les champs magnétiques dynamiques du convertisseur au revêtement, ce qui empêche ces champs de Foucault de se développer pleinement.

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