H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/79
H04R 1/00 (2006.01) H04R 11/00 (2006.01) H04R 25/00 (2006.01)
Patent
CA 1199398
ELECTROMAGNETIC TRANSDUCER Abstract An electromagnetic transducer is disclosed that includes a pole assembly comprising a central pole piece upstanding from a back plate. A coil assembly is disposed about the central pole piece and rests on the back plate. In addition, an inverted cup-shaped permanent magent having a central opening in its base is positioned so that the wall of the magnet circumscribes the coil assembly and rests on the back plate. The rim of the central opening in the base of the permanent magnet is spaced from and encircles the upper end of the central pole piece. Also the wall of the permenent magnet is of a height that the upper surface of the base lies in essentially the same plane as the upper surface of the pole piece. A central armature is supported by a nonmagnetic diaphragm so as to be positioned above and spaced from the central pole piece. The armature lies in a plane that is essentially parallel to the plane of the upper surface of the pole piece and the armature is of a size that it overlaps the portion of the base of the permanent magnet immediately adjacent to the central opening.
419150
Kirby Eades Gale Baker
Western Electric Company Incorporated
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