Patent
1979-01-18
1980-12-16
Brown, Thomas W.
179180, H04R 904
Patent
active
042399432
ABSTRACT:
The present invention is an internal stabilizing spider-dust cap for use in combination with a loudspeaker that has an external centering spider and a surround mechanically coupling the conically shaped diaphragm of the loudspeaker to the frame thereof. The loudspeaker includes a ring-shaped magnet, a pole piece, gap plate, and a pole plate of iron which are separated by a cylindrical voice coil member and a voice coil, which is disposed about the voice coil member, and which provides a magnetic gap for the voice coil. The centering spider aligns the voice coil within the magnetic gap. The stabilizing spider is mechanically coupled to the internal sidewall of the conically shaped diaphragm and to a rod which is disposed perpendicular into the pole piece. The center of the stabilizing spider is mechanically clamped to the rod by a mounting device which is secured in place by a set screw in one embodiment so that it may be raised and lowered in order to modify bias compliance linearity of the existing suspension. A lateral adjustment may also be provided to increase effective excursion and to correct for faulty assembly.
REFERENCES:
patent: 1540585 (1925-06-01), Abbott
patent: 2002189 (1935-05-01), Round et al.
patent: 2147605 (1939-02-01), Lissauer
patent: 2997549 (1961-08-01), Hassan
Hi-Fi Loudspeakers & Enclosures, by A. B. Cohen, pp. 21-23, John F. Rider Publisher, Inc., New York, 1956.
Brown Thomas W.
Cerwin Vega, Inc.
Johansen W. Edward
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