Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element
Patent
1997-09-22
1998-10-27
Le, Huyen
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having electrostatic element
381 96, 381194, H04R 2500
Patent
active
058287671
ABSTRACT:
An electro-magnetic loudspeaker, with dual voice coils operating in corresponding magnetic fields in annular gaps between permanent magnet pole pieces, is provided with a single short-circuited braking coil of one or more turns mounted on the voice coil form midway between the two voice coils. The braking coil has minimal effect on normal operation of the loudspeaker, but introduces an inductive braking effect from counter-EMF whenever the voice coil assembly displacement approaches a working limit in either direction, as the braking coil enters a corresponding one of the two magnetized gaps. Thus bidirectional braking/damping is accomplished in a dual coil speaker by the addition of a single braking coil, which could be simply a one turn ring; whereas bidirectional inductive braking in a speaker with a single voice coil requires two such braking coils flanking the voice coil. The single braking/damping coil can be brought out to terminals for connecting it in a loop circuit with an active feedback driver and/or a network of one or more reactive components, for modifying and enhancing the braking/damping action.
REFERENCES:
patent: 3047661 (1962-07-01), Winker
patent: 5371806 (1994-12-01), Kohara et al.
patent: 6609784 (1986-09-01), Miller
JBL Inc.
Le Huyen
McTaggart J. E.
LandOfFree
Inductive braking in a dual coil speaker driver unit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Inductive braking in a dual coil speaker driver unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inductive braking in a dual coil speaker driver unit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1620400