1979-07-16
1981-10-27
Brown, Thomas W.
1791155VC, H04R 726
Patent
active
042975379
ABSTRACT:
Improvements are disclosed in a loudspeaker of the type having a speaker cone assembly which is reciprocated by a current-carrying voice coil suspended in a constant magnetic field. The constant magnetic field is generated in an annular flux gap formed by a magnetic assembly which includes a cylindrical center pole and an outer pole defining the annular flux gap therebetween. An antifriction bearing which adjoins the voice coil and slidably moves on the cylindrical center pole provides an essentially infinite compliance rear suspension for the speaker cone assembly. The principal improvement of the disclosed loudspeaker is characterized by shock absorbing bumpers which confine the excursions of the speaker cone assembly within a defined range with minimum noise generation and without reducing the compliance of the rear suspension.
REFERENCES:
patent: 1715057 (1929-05-01), Decaux
patent: 2164374 (1939-07-01), Barker
patent: 2775653 (1956-12-01), Wurdel
patent: 3358088 (1967-12-01), Gault
patent: 3496307 (1970-02-01), Sotome
patent: 3983337 (1976-09-01), Babb
patent: 4115667 (1978-09-01), Babb
Brown Thomas W.
Cantrell Thomas L.
Moore Stanley R.
Schley Joseph H.
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