Dynamic electroacoustic transducer having a moving coil in an air gap filled with a magnetic liquid
AssigneeLicentia Patent-Verwaltungs-G.m.b.H.
InventorKarl-Heinz Thiele
Life of this patent
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Abstract
A dynamic electroacoustic transducer includes a moving coil which is arranged in an air gap between a pole piece and a pole plate which is filled with a magnetic liquid. At least the outside of the coil has a smooth surface in contact with the magnetic liquid. The coil may also advantageously be wound on a carrier from a wire which is flat at least on one side so that this flat side is turned outwardly and presents a smooth continuous surface. The cross-section of such a wire may advantageously be rectangular. The coil may be coated on its outside surface with a foil of well-conducting material, such as aluminum, or the grooves between a cylindrical coil, for example, may be filled with a lacquer or the like.
Claims10
A dynamic electroacoustic transducer, comprising a pole core base, a pole plate spaced from said base and defining an air gap therebetween, a moving coil disposed around said pole core base and being movable in the air gap, said coil extending beyond each end of said air gap, a magnetic liquid in said gap at least at the side of said coil remote from said pole core base, and smooth continuous surface means on said coil in contact with said magnetic liquid for separating said moving coil from contact with said magnetic liquid in said gap, said smooth continuous surface means being disposed intermediate said moving coil and said magnetic liquid on the side of said moving coil remote from said pole core base.
Dependencies are inferred from the claim text.