US PATENT SUBCLASS 381 / 406
.~.~.~ Field 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  DF  .~.~ Movable voice coil {8}
406.~.~.~ Field coil

DEFINITION

Classification: 381/406

Field coil:

(under subclass 400) Subject matter including a spirally wound conductor which receives a current designed to generate a static field against which the signal-related electromagnetic field of the voice coil will react to

generate motion.

(1) Note. A field coil generally substitutes for or augments a permanent magnet.