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: A membrane for an electro-acoustic transducer comprised of at least one elastomer layer made using spray coating of a liquid elastomer solution is provided. The at least one layer of elastomer is made by spraying a liquid elastomer solution, which may comprise a silicone, onto a mold having the desired membrane geometry, allowing the solution to cure and remove the membrane from the mold. The mold can be configured to hold other components of an electro-acoustic transducer that will be attached to the membrane after the curing step.

Abstract: The invention relates to an electromagnetic actuator, which is designed to be connected to a backside of a plate like structure and which comprises an annular coil arrangement and a magnet system being designed to generate a magnetic field transverse to the annular coil arrangement. The annular coil arrangement and the magnet system are connected to each other by a plurality of springs, which are arranged inside of the annular coil arrangement.

Abstract: The invention relates to an electromagnetic actuator, which is designed to be connected to a backside of a plate like structure and which comprises an annular coil arrangement and a magnet system being designed to generate a magnetic field transverse to the annular coil arrangement. The annular coil arrangement and the magnet system are connected to each other by a plurality of springs, which are arranged inside of the annular coil arrangement. Furthermore, the invention relates to an output device, comprising a plate like structure and an electromagnetic actuator of the above kind connected to a backside of the plate like structure.

Abstract: A voice coil (4, 4a . . . 4f) for an electrodynamic actuator (6a . . . 6c) is disclosed, which comprises a plurality of conductive open annular strips (15, 15A . . . 15n, 15a . . . 15h) stacked over one another with insulation layers (18) in-between, wherein ends (Ea . . . Eh) of adjacent strips (15, 15A . . . 15n, 15a . . . 15h) overlap in an overlap-ping zone (ZO) when viewed in a direction parallel to a coil axis (CA) and wherein adjacent strips (15, 15A . . . 15n, 15a . . . 15h) are electrically connected to each other in a connection zone (ZC) within the overlapping zone (ZO). Ends (Ea . . . Eh) of the conductive strips (15, 15A . . . 15n, 15a . . . 15h) are embodied as non-straight ends, and positions (P) of connection zones (ZC), which connect different conductive strips (15, 15A . . . 15n, 15a . . . 15h), vary in a direction transversal to the circumferential direction (CD) in the overlapping zone (ZO). Moreover, a manufacturing meth-od for such a voice coil (4, 4a . . .

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: A method for manufacturing an electrodynamic acoustic transducer is disclosed. The electrodynamic acoustic transducer comprises a frame and/or a housing, a membrane, at least one coil and a magnet system, wherein the coil, in a cross sectional view with a coil axis being part of the sectional plane, comprises a plurality of conductive layers formed by an electrical conductor of the coil. The electrical conductor has a rectangular cross section in said cross sectional view, wherein a longer side of the rectangular cross section is substantially perpendicular to the loop axis. According to this method, a stack of conductive layers is made from the electrical conductor by stacking of separate pieces of the electrical conductor and electrically connecting the stacked separate pieces and/or by folding of the electrical conductor.

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: A method of manufacturing a voice coil (1a . . . 1d) is disclosed, wherein windings (4a . . . 4g) in a first section (B1) are arranged one above the other and are arranged next to each other in a second section (B2) when viewed in said cross sectional plane (D). In a first step, a first and a second winding (4a, 4a?, 4b) of the windings (4a . . . 4g) are arranged over one another but offset sideways to each other in the second section (B2). In a second step, the first winding (4a, 4a?) is moved into a height position of the second winding (4b) in the second section (B2) by pressing and/or folding. Moreover, an electrodynamic actuator (17a . . . 17c), comprising a voice coil (1a . . . 1d) of the above kind is disclosed. Finally, an electrodynamic transducer (32a, 32b), a speaker (21) and an output device comprising such an electrodynamic actuator (17a . . . 17c) is disclosed.

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: The present invention relates to a method for monitoring the integrity of an inertial measurement assembly (10) of an aircraft, the measurement assembly comprising at least one high-grade measurement unit (20); and at least two low-grade measurement units (30, 40); wherein each of the measurement units (20, 30, 40) comprises a sensor unit (22, 32, 42) and a processing unit (24, 34, 44) operatively coupled to the respective sensor unit (22, 32, 42), wherein the respective sensor units (22, 32, 42) measure accelerations and angular rates of the aircraft and provide raw data based on said measurements; wherein the respective processing units (24, 34, 44) process the raw data provided by the sensor units (22, 32, 42) and provide processed data reflecting the velocity and/or attitude of the aircraft; the method comprising: at a sensor monitoring unit (50), receiving the raw data output by each of the sensor units (22, 32, 42) and evaluating according to at least one predetermined criterion whether the raw data of

Abstract: System 10 for navigating an aircraft 12, comprising a flight planning system 14 configured to prepare a set of at least three different trajectories for a flight from a departure point to a destination point, a flight verification system 16 configured to verify each trajectory of the set of trajectories, an onboard flight management system 26 to be installed at an aircraft 12 and having a storage unit 28 for storing the set of trajectories, wherein the flight management system is configured to select one of the trajectories from the set of trajectories as an active trajectory for a current flight of the aircraft, wherein the flight management system 26 includes a replanning unit 30 configured to change, during the current flight, the active trajectory by selecting a second trajectory from the set of trajectories as the active trajectory for the current flight, such as to continue the current flight based on the second trajectory t.

Abstract: An electrodynamic acoustic transducer, is disclosed, which comprises a frame and/or a housing, a membrane, at least one coil and a magnet system. The coil in a cross sectional view with a coil axis being part of the sectional plane comprises a plurality of conductive layers formed by an electrical conductor of the coil. The electrical conductor has a rectangular cross section in said cross sectional view, wherein a longer side of the rectangular cross section is substantially perpendicular to the loop axis. Furthermore, a method for manufacturing an electrodynamic acoustic transducer of the proposed kind is disclosed. According to this method, a stack of conductive layers is made from the electrical conductor by stacking of separate pieces of the electrical conductor and electrically connecting the stacked separate pieces and/or by folding of the electrical conductor.

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: The invention relates to an electromagnetic actuator, which can be connected to a backside of a plate like structure and which comprises a voice coil, a magnet system and a spring arrangement connecting the voice coil and a movable part of the magnet system. The spring arrangement comprises at least two spiral springs each having at least three spring legs. The spring legs run in radial and tangential direction in a clockwise or counterclockwise winding direction and are rotational symmetric around the coil axis. The winding directions of the spiral springs are chosen in a way that rotations around the coil axis caused by a relative movement between the voice coil and the movable part of the magnet system in the excursion direction are oriented in opposite directions. The invention also relates to an output device with a plate like structure and an electromagnetic actuator connected thereto.

Abstract: An electrodynamic acoustic transducer is disclosed, which comprises a frame and/or a housing, at least one coil and a magnet system, which is fixed to the frame and/or the housing and which is designed to generate a magnetic field through the coil. Furthermore, the electrodynamic acoustic transducer comprises a polygonal membrane, which in an inner portion is fixed to the at least one coil and which in an outer annular portion is fixed to the frame or the housing. A first distance between the outer annular portion and the inner portion at a longitudinal side of the polygonal membrane is smaller or greater than a second distance between the outer annular portion and the inner portion at a corner of the polygonal membrane.

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 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: A method for manufacturing an electrodynamic acoustic transducer is disclosed. The electrodynamic acoustic transducer comprises a frame and/or a housing, a membrane, at least one coil and a magnet system, wherein the coil, in a cross sectional view with a coil axis being part of the sectional plane, comprises a plurality of conductive layers formed by an electrical conductor of the coil. The electrical conductor has a rectangular cross section in said cross sectional view, wherein a longer side of the rectangular cross section is substantially perpendicular to the loop axis. According to this method, a stack of conductive layers is made from the electrical conductor by stacking of separate pieces of the electrical conductor and electrically connecting the stacked separate pieces and/or by folding of the electrical conductor.