Speaker with fine grain ferromagnetic material on center pole or

Details Speaker with fine grain ferromagnetic material on center pole or Speaker with fine grain ferromagnetic material on center pole or

1979-05-10

1981-09-15

Brown, Thomas W.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Retarded or delayed type

29607, 335231, H01F 100, H04R 906

Patent

active

042899370

ABSTRACT:
A speaker comprises a voice coil placed in an air gap between a center pole and a plate wherein a specific ferromagnetic material obtained by forming fine crystalline grains is used on at least one of the surfaces of the center pole and the plate which respectively face the voice coil, thereby providing a speaker having low distortion.

REFERENCES:
patent: 2027994 (1936-01-01), Mishima
patent: 3573897 (1971-04-01), Wache
patent: 3665352 (1972-05-01), Dietrich et al.
patent: 3922501 (1975-11-01), Yamamuro
patent: 3936323 (1976-02-01), Kazeva
patent: 3971676 (1976-07-01), Detert et al.
patent: 4075437 (1978-02-01), Chin et al.
patent: 4119445 (1978-10-01), Bosch et al.

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