Permanent magnet arrangement e.g. for vehicle loudspeaker - includes associated oscillatory coil arrangement to drive loudspeaker diaphragm

摘要

At least four oscillatory coils are provided in a single arrangement and each is individually controlled. The permanent magnet arrangement is comprised of axially polarised permanent magnet discs (1.1, 1.2, 1.3, 1.4, 1.5) arranged axially one behind the other so that like poles lie opposite one another. Magnetic intermediate discs (1.6, 1.7, 1.8, 1.9) are arranged between these permanent magnet discs, in order to take care of strong radial concentration of the magnetic flux through the individually controlled oscillating coils (1.10, 1.11, 1.12, 1.13). ADVANTAGE - Control of loudspeaker by digital signals.