Embodiments are disclosed of a flat speaker containing a single permanent magnet, a yoke opposite the single permanent magnet, and one or more voice coil plates located between the single permanent magnet and the yoke. The one or more voice coil plates each comprise a bobbin and a coil arranged on one or both sides of the bobbin.

A dual function transducer assembly comprising: a magnet motor assembly comprising a first magnet plate and a second magnet plate arranged in parallel to one another along a first axis; a sound output assembly coupled to the magnet motor assembly, the sound output assembly comprising a piston and a voice coil, and wherein the voice coil is arranged to cause a vibration of the piston in a direction parallel to the first axis; and a shaker assembly coupled to the magnet motor assembly, the shaker assembly comprising a first shaker coil and a second shaker coil arranged to cause a vibration of the magnet assembly in a direction parallel to a second axis that is perpendicular to the first axis.

The invention relates to a speaker (1) comprising a coil arrangement (2) with at least two voice coils (3a, 3b), a magnet system (4) and a membrane (10) being fixed to the coil arrangement (2) and the magnet system (4). The membrane (10) has a first compliance (c.sub.1) and together with the coil arrangement (2) causes a first resonance frequency (fres.sub.1) for an oscillation of the membrane (10). In addition, the speaker (1) comprises a second connector (14, 17, 17a, 17b, 24, 25a, 25b) with a second compliance (c.sub.2), which interconnects the voice coils (3a, 3b). The second connector (14, 17, 17a, 17b, 24, 25a, 25b) together with the voice coils (3a, 3b) causes a higher second resonance frequency (fres.sub.2) for the oscillation of the membrane (10). Moreover, the invention relates to an electronic sound signal circuit (18), which is designed to output coil signals (SO1, SO2) having a frequency dependent phase shift (φ). In addition, invention relates to a sound system comprising an electronic sound signal circuit and a speaker of the above kind and to a method for manufacturing a coil arrangement (2).

A speaker includes: a diaphragm; a coil directly or indirectly attached to the diaphragm; a pair of conducting lines connecting electrically with the coil; a yoke having one pair of longer side portions, and another pair of shorter side portions; a frame disposed between the coil and the yoke; and an inner terminal provided on an area on a straight line extended from the longer side portion of the yoke, and electrically connected to the coil.

A magnet system (100) for an electromechanical transducer has a first set (2) of magnets and a second set (4) of magnets. The first set (2) of magnets has a first, inner annular magnet (6) and a first outer, annular magnet (8), and the second set (4) of magnets has a second, inner annular magnet (10) and a second, outer annular magnet (12). The first, inner annular magnet (6) is arranged in the interior of the first outer annular magnet (8), and the second inner annular magnet (10) is arranged in the interior of the second outer annular magnet (12). The magnetic polarity in respect of the first, inner annular magnet (6), the first, outer annular magnet (8), the second, inner annular magnet (10), and of the second, outer annular magnet (12) has a direction (Y) corresponding to a direction perpendicular to the annular extension (X) of the magnets.

A dual function transducer assembly comprising: a magnet motor assembly comprising a first magnet plate and a second magnet plate arranged in parallel to one another along a first axis; a sound output assembly coupled to the magnet motor assembly, the sound output assembly comprising a piston and a voice coil, and wherein the voice coil is arranged to cause a vibration of the piston in a direction parallel to the first axis; and a shaker assembly coupled to the magnet motor assembly, the shaker assembly comprising a first shaker coil and a second shaker coil arranged to cause a vibration of the magnet assembly in a direction parallel to a second axis that is perpendicular to the first axis.

A transducer assembly comprising: a magnet motor assembly comprising a first magnet plate and a second magnet plate arranged along an axis, a first support plate positioned between inward facing surfaces of the first magnet plate and the second magnet plate, a second support plate positioned along an outward facing surface of the first magnet plate to form a first magnetic gap between the first support plate and the second support plate, and a third support plate positioned along an outward facing surface of the second magnet plate to form a second magnetic gap between the first support plate and the third support plate; a voice coil coupled to the magnet motor assembly, wherein the voice coil is positioned around the first support plate and within the first magnetic gap and the second magnetic gap; and a piston coupled to the voice coil, wherein the piston is operable to vibrate in a direction parallel to the axis.

An electro-acoustic transducer includes a diaphragm and an electro-magnetic motor that is coupled to the diaphragm. The motor includes a voice coil and a magnetic circuit that defines an air gap within which the voice coil is at least partially disposed. The magnetic circuit includes a first, axially polarized permanent magnet that provides a first magnetic flux path and a second, radially polarized permanent magnet that provides a second magnetic flux path. The first and second magnetic flux paths are arranged to interact with the voice coil to drive motion of the diaphragm.

A speaker device includes: a diaphragm; a coil directly or indirectly attached to the diaphragm; a yoke having a notch on a bottom surface thereof; a frame to which the coil and the yoke are attached; and a first terminal provided on the frame and electrically connected to the coil. The first terminal is provided at a position corresponding to the notch of the yoke.

A transcutaneous bone-anchored hearing aid device for a recipient patient is described. The transcutaneous bone-anchored hearing aid device for a recipient patient comprising; a receiver coil for transcutaneous receiving of an externally generated communication signal; a signal processor configured for converting the externally generated communication signal into an electrical stimulation signal; an electromagnetic vibrator configured for receiving the electrical stimulation signal, and wherein the electromagnetic vibrator including; a coil unit configured to generate a dynamic magnetic flux based on the electrical stimulation signal; a permanent magnet configured to generate a static magnetic flux; a mass unit connected to the permanent magnet; a bobbin unit configured to engage with the coil unit, the permanent magnet, and the mass unit; a spring unit configured for maintaining an air gap below a moving mass, wherein the moving mass includes the coil unit, the permanent magnet, the mass unit and the bobbin unit, and where the moving mass and the spring unit is configured to generate an acoustical vibration; a vibrator plate configured to receive the acoustical vibration, and where the air gap is between the vibrator plate and a part of the moving mass, and wherein the mass unit has at least one insert configured to receive at least one of a group that includes at least a part of the permanent magnet, the coil unit, the vibrator plate and/or the spring unit.