Title:
ELECTROMAGNETIC CONVERTER
Document Type and Number:
Japanese Patent JPS58127500
Kind Code:
A
Abstract:
An electromagnetic transducer is disclosed that includes a pole assembly (110) comprising a central pole piece (112) upstanding from a back plate (114). A coil assembly (120) is disposed about the central pole piece (112) and rests on the back plate (114). In addition, an inverted cup-shaped permanent magnet (130) having a central opening (132) in its base (131) is positioned so that the wall (134) of the magnet circumscribes the coil assembly (120) and rests on the back plate (114). The rim of the central opening (132) in the base (131) of the permanent magnet (130) is spaced from and encircles the upper end of the central pole piece (112). Also the wall (134) of the permanent magnet (130) is of a height that the upper surface of the base (131) lies in essentially the same plane as the upper surface of the pole piece (112). A central armature (222) is supported by a nonmagnetic diaphragm (221) so as to be positioned above and spaced from the central pole piece (112). The armature (222) lies in a plane that is essentially parallel to the plane of the upper surface of the pole piece (112), and the armature is of a size that it overlaps the portion of the base (131) of the permanent magnet (130) immediately adjacent to the central opening (132).
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Inventors:
RICHIYAADO MAIRON HANTO
Application Number:
JP184083A
Publication Date:
July 29, 1983
Filing Date:
January 11, 1983
Export Citation:
Assignee:
WESTERN ELECTRIC CO
International Classes:
H04R13/00; H04R11/00; H04R25/00; (IPC1-7): H04R13/00; H04R13/02
Attorney, Agent or Firm:
Masao Okabe