Electromagnetic drive arrangement for a loudspeaker with a planar, flexible diaphragm

摘要

The drive means comprises a linear conductor 1a borne on the diaphragm 2a and a magnet arrangement 3 mounted in proximity to the linear conductor and arranged to provide a force that is substantially perpendicular to the surface of the diaphragm, substantially proportional to a current within the linear conductor and arranged to provide a substantially constant force over the full range of the diaphragm movement. The magnet assembly is arranged such that north and south poles define a magnetic axis that lies in a plane parallel to the plane of the diaphragm. The linear conductor is arranged such that it extends beyond the end faces of the magnetic poles (fig. 9 for example).