Dynamic electroacoustic transducer having a moving coil in an ai

Details Dynamic electroacoustic transducer having a moving coil in an ai Dynamic electroacoustic transducer having a moving coil in an ai

1979-12-28

1981-12-01

Moffitt, James W.

H04R 906

Patent

active

043038069

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.

REFERENCES:
patent: 1971452 (1934-08-01), Herrmann
patent: 4017694 (1977-04-01), King

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