Sound Solutions International Company, Ltd.

Sound Solutions International (zhenjiang) Co., Ltd.

Michael Schoffmann

Gustav Otto

Friedrich Reining

Christoph Schmauder

Franz Heidinger

Manuel Mefleh

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.

Electromagnetic actuator for a display with improved spring arrangement and output device with said actuator

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.

An electrodynamic actuator () is disclosed, which is designed to be connected to a plate like structure () and which comprises a coil arrangement () with at least one voice coil (), a magnet system () with a movable magnetic circuit part () and a static magnetic circuit part (F) and a spring arrangement () coupling the static magnetic circuit part (F) to the movable magnetic circuit part () and allowing a relative movement between the same. Both the spring arrangement () and the magnet system () provide a total restoring force (F) directed towards an idle position (P) of the movable magnetic circuit part (). A part of a total restoring force gradient (&#x394;F/&#x394;z) caused by the magnet system () is at least 10% of the total restoring force gradient (&#x394;F/&#x394;z) in said idle position (P) of the movable magnetic circuit part (). In addition, an output device () with the electromagnetic actuator () mounted to a plate like structure () is disclosed.

Adjustable magnetic spring for actuator

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.

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Baden, Austria

Michael Schoffmann