Minimization of distortion due to a voice coil displacement in a

Details Minimization of distortion due to a voice coil displacement in a Minimization of distortion due to a voice coil displacement in a

1984-12-03

1987-04-28

Rubinson, Gene Z.

Telephonic communications

Call or terminal access alarm or control

Lockout or double use signalling

379199, H04R 906, H04R 902, H01F 300

Patent

active

046619739

ABSTRACT:
A speaker of a type having a voice coil wound to a greater length than the length of a magnetic gap into which it extends formed between a pole of a yoke and an annular plate. A magnetic flux density setting structure is provided for establishing a constant value of Bl, where B represents the density of the magnetic flux capable of linking the voice coil and l represents the effective length of the voice coil. The magnetic flux density setting structure may be formed as a tapered surface or surfaces on the pole of the yoke or by a separate tapered plate or plates attached to the annular plate. Further, a metal cap is mounted on the pole covering an upwardly facing cup-shaped body of magnetic material.

REFERENCES:
patent: 2180482 (1939-11-01), Price
patent: 3134057 (1964-05-01), Tsunoo et al.
patent: 3250862 (1966-05-01), Rollins
patent: 3651283 (1972-03-01), Doschek
patent: 4295011 (1981-10-01), Hathaway
patent: 4297537 (1981-10-01), Babb
patent: 4386332 (1983-05-01), Saito
patent: 4508941 (1985-04-01), Wiggins

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