Electrodynamic actuator with improved magnet system

An electrodynamic actuator (2a . . . 2l), designed to be connected to a sound emanating structure (3), comprising:

• a coil arrangement (4) with at least one voice coil (5, 6), which has an electrical conductor in the shape of loops running around a coil axis (C) in a loop section (L);
• a magnet system (7a, 7l), comprising an annular peripheral magnet system part (8a, 8l) and a center magnet system part (9a, 9l) with the coil arrangement (4) in-between, wherein the magnet system (7a, 7l) is designed to generate a magnetic field (B) transverse to the conductor in the loop section (L);
• and
• a spring arrangement (15) coupling the peripheral magnet system part (8a, 8l) to the center magnet system part (9a, 9l) and allowing a relative movement between the peripheral magnet system part (8a, 8l) and said center magnet system part (9a, 9l) in an excursion direction parallel to the coil axis (C),
• wherein the center magnet system part (9a, 9l) comprises a center magnet (11) and at least one plate (12a . . . 13l) adjoining said center magnet (9a, 9l) in the excursion direction,
• characterized in that the at least one plate (12a . . . 13l) comprises a collar (14a . . . 14l′) on its outer edge, which faces away from the center magnet (11) in the excursion direction.