Patent ID: 7158651

Claim:
An electromagnetic driver for a planar diaphragm loudspeaker, with a soft magnetic core ( 2 ) in an E-shaped form having three legs and a back; an alternating field exciter ( 4 ) that is magnetically coupled to the soft magnetic core ( 2 ), for generating a magnetic alternating flux that depends on a sound signal (I), in the soft magnetic core (2); a constant field exciter ( 3 ) which is magnetically coupled to the soft magnetic core ( 2 ), for generating a constant magnetic flux in the soft magnetic core ( 2 ); and a soft magnetic element ( 5 ), which magnetically terminates the legs with at least one small induction gap and is located opposite the back, for coupling with the plate ( 1 ) of the planar diaphragm loudspeaker, where the alternating flux and the constant flux are asymmetrically superimposed so that a resulting force or a resulting torque in the soft magnetic element ( 5 ) is essentially linear with respect to the sound signal (I).