US PATENT SUBCLASS 381 / 400
.~.~ Movable voice coil

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
396  DF  .~ Electromagnetic (e.g., dyynamic) {8}
400.~.~ Movable voice coil {8}
401  DF  .~.~.~> Multiple voice coils {1}
403  DF  .~.~.~> Centering from outside bobbin or diaphragm {1}
405  DF  .~.~.~> Centering from within bobbin or diaphragm
406  DF  .~.~.~> Field coil
407  DF  .~.~.~> Particular bobbin structure
408  DF  .~.~.~> Pattern
409  DF  .~.~.~> Wiring structure
410  DF  .~.~.~> Coil coating, winding layer structure, or wire

DEFINITION

Classification: 381/400

Movable voice coil:

(under subclass 396) Subject matter having a spiral shaped conductor attached to a flexible membrane and positioned in an air gap in a magnetic circuit, so as to drive the membrane in accordance with an applied current.