Annular gap magnet system, particularly for low frequency loudsp

Details Annular gap magnet system, particularly for low frequency loudsp Annular gap magnet system, particularly for low frequency loudsp

1982-12-23

1986-12-09

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having protective or sheilding feature

335231, 381199, H04R 902

Patent

active

046281541

ABSTRACT:
An annular gap magnet system, in particular for a low frequency loudspeaker (Woofer), in which a coil is movable with a large stroke in the working air gap. A braking air gap provided in the region of the inner or lower pole plate produces a magnetic resistance in the pole plate so that a part of the magnetic flux flows over the braking air gap. This magnetic flux is opposed to the stray magnetic flux below the working air gap and excites a counter magnetic field which opposes further inward movement of the moving coil. In this way an impact of the moving coil against the inner or lower pole plate is prevented. In a low frequency loudspeaker the membrane carrying the moving coil may, therefore, be suspended extremely softly.

REFERENCES:
patent: 3073411 (1963-01-01), Bleazey
patent: 3803522 (1974-04-01), Rooney
patent: 3881074 (1975-04-01), Kawamura

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