US PATENT SUBCLASS 381 / 417
.~.~.~ Armature diaphragm

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}
412  DF  .~.~ Magnetic circuit {8}
417.~.~.~ Armature diaphragm

DEFINITION

Classification: 381/417

Armature diaphragm:

(under subclass 412) Subject matter in which the voice coil is stationary and a moving membrane itself is made of magnetic material and vibrates within the fluctuating electromagnetic field of the voice coil.

SEE OR SEARCH THIS CLASS, SUBCLASS:

419, for an electromagnetic transducer not having a central magnetic portion in the magnetic circuit.