Abstract: An electrodynamic actuator (2a . . . 2l) is disclosed, which is designed to be connected to a sound emanating structure (3) and which comprises a coil arrangement (4) with at least one voice coil (5, 6) and 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. Further on, the electrodynamic actuator (2a . . . 2l) comprises a spring arrangement (15), which couples the peripheral magnet system part (8a, 8l) to the center magnet system part (9a, 9l) and allows a relative movement between the same in an excursion direction parallel to a coil axis (C). 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, wherein the at least one plate (12a . . . 13l) comprises a collar (14a . . . 14l?) on its outer edge, which faces away from the center magnet (11).

Abstract: An electrodynamic actuator (1a . . . 1c) for a plate like structure (25) or membrane (2) is disclosed, which comprises a voice coil (7, 7a, 7b), a magnet system (8) and a plurality of arms (17a . . . 17t) coupling the voice coil (7, 7a, 7b) and the magnet system (8) in a movable manner. The arms (17a . . . 17t) are made of a metal with a fatigue strength of at least 370 N/mm2 or an ultimate tensile strength of at least 1100 N/mm2. Each of the arms (17a . . . 17t) comprises at least two arm sections (s, s1, s2), which are arranged movable to each other, and which are connected to each other by means of a damping material (18a . . . 18g) with a tensile storage modulus of 0.1-6000 MPa and a tensile loss factor of at least 0.1, each measured at room temperature of 20° C. Moreover the invention relates to speaker (5) and an electrodynamic transducer (26a, 26b) with such an electrodynamic actuator (1a . . . 1c) and a method of manufacturing an intermediate product for such an electrodynamic actuator (1a . . . 1c).

Abstract: An electrodynamic actuator (1a . . . 1e) is disclosed, which comprises a first iron body (2), at least one voice coil (3a, 3b, 4a . . . 4c, 14a, 14b) and a plurality of permanent magnets (5a . . . 5c, 6a . . . 6c), wherein an arrangement (8) is formed by the first iron body (2) and the at least one voice coil (3a, 3b, 4a . . . 4c, 14a, 14b) and wherein the at least one voice coil (3a, 3b, 4a . . . 4c, 14a, 14b) is fixed to or embedded in the first iron body (2). Furthermore, the electrodynamic actuator (1a . . . 1e) comprises a plurality of arms (7a . . . 7f), which connect the arrangement (8) to the permanent magnets (5a . . . 5c, 6a . . . 6c) and allow a relative movement between said arrangement (8) and the permanent magnets (5a . . . 5c, 6a . . . 6c) in an excursion direction (D) parallel to the coil axis (C, C1 . . . C3). The permanent magnets (5a . . . 5c, 6a . . . 6c) are each magnetized in a magnetizing direction (M1, M2) transverse to the coil ax-is (C, C1 . . . C3).

Abstract: An electrodynamic actuator (1a . . . 1f) is disclosed, which comprises at least one voice coil (3a, 3b, 4a . . . 4c, 14a, 14b), a magnet system (9a, 9b) and a plurality of arms (7a . . . 7h) movably coupling the at least one voice coil (3a, 3b, 4a . . . 4c, 14a, 14b) and the magnet system (9a, 9b) or a movable part (10) of the magnet system (9a, 9b). A first magnet subsystem (11a) and a first part (12a) of the arms (7a . . . 7h) form a first oscillating system (13a) with a first resonance frequency fres1, and a second magnet subsystem (11b) and a second part (12b) of the arms (7a . . . 7h) form a second oscillating system (13b) with a second resonance frequency fres2, which is different from the first resonance frequency fres1. Additionally, an electrodynamic transducer (16a, 16b), an output device and a speaker (19) with such an electrodynamic actuator (1a . . . 1f) is disclosed.

Abstract: An electrodynamic actuator for a speaker or an electrodynamic acoustic transducer in general is disclosed, which comprises at least one voice coil, a magnet system and an arm arrangement of a plurality of arms connecting the at least one voice coil and the magnet system or at least a movable part thereof so that a relative movement between these parts is allowed. The arms are made of a metal core, which at least partly is coated with a coating structure having at least one coating metal layer consisting of a different material than the metal core.

Abstract: An electrodynamic actuator (1a, 1b) is disclosed, which is designed to be connected to a plate like structure (2) and which comprises a coil arrangement (3a, 3b) with at least one voice coil (4a, 4b), a magnet system (5) with a movable magnetic circuit part (7, 7a . . . 7f) and a static magnetic circuit part (6a . . . 6F) and a spring arrangement (12) coupling the static magnetic circuit part (6a . . . 6F) to the movable magnetic circuit part (7, 7a . . . 7f) and allowing a relative movement between the same. Both the spring arrangement (12) and the magnet system (5) provide a total restoring force (FT) directed towards an idle position (P0) of the movable magnetic circuit part (7, 7a . . . 7f). A part of a total restoring force gradient (?FT/?z) caused by the magnet system (5) is at least 10% of the total restoring force gradient (?FT/?z) in said idle position (P0) of the movable magnetic circuit part (7, 7a . . . 7f).

Abstract: An electrodynamic actuator for a speaker or an electrodynamic acoustic transducer in general is disclosed, which comprises at least one voice coil, a magnet system and an arm arrangement of a plurality of arms connecting the at least one voice coil and the magnet system or at least a movable part thereof so that a relative movement between these parts is allowed. The arms are made of metal with a fatigue strength of at least 370 N/mm2 or an ultimate tensile strength of at least 1100 N/mm2.

Abstract: An electrodynamic actuator (1a . . . 1c) for a plate like structure (25) or membrane (2) is disclosed, which comprises a voice coil (7, 7a, 7b), a magnet system (8) and a plurality of arms (17a . . . 17t) coupling the voice coil (7, 7a, 7b) and the magnet system (8) in a movable manner. The arms (17a . . . 17t) are made of a metal with a fatigue strength of at least 370 N/mm2 or an ultimate tensile strength of at least 1100 N/mm2. Each of the arms (17a . . . 17t) comprises at least two arm sections (s, s1, s2), which are arranged movable to each other, and which are connected to each other by means of a damping material (18a . . . 18g) with a tensile storage modulus of 0.1-6000 MPa and a tensile loss factor of at least 0.1, each measured at room temperature of 20° C. Moreover the invention relates to speaker (5) and an electrodynamic transducer (26a, 26b) with such an electrodynamic actuator (1a . . . 1c) and a method of manufacturing an intermediate product for such an electrodynamic actuator (1a . . . 1c).

Abstract: An electrodynamic actuator (1a, 1b) is disclosed, which is designed to be connected to a plate like structure (2) and which comprises a coil arrangement (3a, 3b) with at least one voice coil (4a, 4b), a magnet system (5) with a movable magnetic circuit part (7, 7a . . . 7f) and a static magnetic circuit part (6a . . . 6F) and a spring arrangement (12) coupling the static magnetic circuit part (6a . . . 6F) to the movable magnetic circuit part (7, 7a . . . 7f) and allowing a relative movement between the same. Both the spring arrangement (12) and the magnet system (5) provide a total restoring force (FT) directed towards an idle position (P0) of the movable magnetic circuit part (7, 7a . . . 7f). A part of a total restoring force gradient (?FT/?z) caused by the magnet system (5) is at least 10% of the total restoring force gradient (?FT/?z) in said idle position (P0) of the movable magnetic circuit part (7, 7a . . . 7f).

Abstract: An electrodynamic actuator for a speaker or an electrodynamic acoustic transducer in general is disclosed, which comprises at least one voice coil, a magnet system and an arm arrangement of a plurality of arms connecting the at least one voice coil and the magnet system or at least a movable part thereof so that a relative movement between these parts is allowed. The arms are made of metal with a fatigue strength of at least 370 N/mm2 or an ultimate tensile strength of at least 1100 N/mm2.

Abstract: An electrodynamic actuator for a speaker or an electrodynamic acoustic transducer in general is disclosed, which comprises at least one voice coil, a magnet system and an arm arrangement of a plurality of arms connecting the at least one voice coil and the magnet system or at least a movable part thereof so that a relative movement between these parts is allowed. The arms are made of a metal core, which at least partly is coated with a coating structure having at least one coating metal layer consisting of a different material than the metal core.