Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1979-09-10
1982-04-27
Swann, III, Glen R.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
1791155ES, 179117, 181171, H04R 906
Patent
active
043272576
ABSTRACT:
An electro-acoustical transducer has a voice coil assembly, a diaphragm coupled to the voice coil, a permanent magnet arrangement for providing a magnetic field in an air gap, and support means for axially centering the voice coil assembly in the air gap and means for maintaining axial alignment of the voice coil assembly during movement thereof. In one embodiment, the permanent magnet arrangement comprises two concentrically disposed permanent magnets whose adjacent faces are oppositely poled. In some embodiments, the support means comprises a rigid diaphragm disposed between rigid top and bottom spiders and at least one slideably mounted rod connecting the two spiders. Other embodiments of the invention use a single rigid spider which is guided on a single stationary centering rod.
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