Loudspeaker

Details Loudspeaker Loudspeaker

1994-08-03

1995-10-24

Kuntz, Curtis

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having electrostatic element

381194, 381192, 381201, H04R 2500

Patent

active

054616778

ABSTRACT:
A loudspeaker including one or more secondary magnets positioned proximate to an opening of a gap through which a voice coil moves, to capture escaping ferrofluid and return the fluid to the gap. The secondary magnets have axial poles and are oriented, relative to a speaker magnet, to enhance the radial magnetic flux within the gap and to diminish the flux of a fringe field axially adjacent to the gap. When ferrofluid escapes from the gap, it is captured and held by one of the secondary magnets at a distal edge, which is a position of relatively high flux density within the magnetic field of the secondary magnet. When the amount of fluid held by the secondary magnet forms a sufficiently large miniscus, additional fluid captured by the magnet flows to a second region of relatively high flux density in the field of the secondary magnet and is drawn into the voice coil gap.

REFERENCES:
patent: 4492827 (1985-01-01), Shintaku
patent: 5062140 (1991-10-01), Inanaga et al.

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