Harman Becker Automotive Systems Gmbh

Hans-Jürgen Regl

Gerhard Krump

Wolfgang Bachmann

Andreas Ziganki

The invention relates to an electromagnetic driver comprising a soft magnetic core in the form of an E with three legs and a back, an alternating field driver, magnetically coupled to the soft magnetic core, for generating an alternating magnetic field in the soft magnetic core, depending upon a sound signal, a constant field driver magnetically coupled to the soft magnetic core for generation of a constant magnetic field in the soft magnetic core, a soft magnetic element for coupling to the plate of the planar diaphragm loudspeaker, lying opposite the back and magnetically closing the legs across at least one small induction gap, whereby the constant field and the alternating field are asymmetrically superimposed such that a resulting force, or a resulting torque on the soft magnetic element, is proportional to the sound signal.

Electromagnetic driver for a planar diaphragm loudspeaker

The invention relates to a planar loudspeaker comprising a light, thin soundboard () which may be energized to produce multiply-reflected bending waves, a surrounding frame () holding the soundboard () in an articulated, shear-resistant manner; at least one driver () connected to the soundboard () to energize the soundboard (); and at least one bridge (), rigidly connecting the at least one driver () to the frame (), wherein the bridge or at least one of the bridges () is connected to the damping board ().

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Wuppertal, Germany

Hans-Jürgen Regl