Abstract: An electromagnetic signal converter for a bone conduction receiver includes a soft-magnetic armature which is moveable relative to a pole that supports an electric coil, a permanent magnet, and a soft-magnetic yoke which forms a magnetic circuit with the permanent magnet, the pole, and the armature. First and second poles are provided, each having an electric coil. Both poles have an identical design and are arranged symmetrically on a common pole axis. The armature is arranged between the two poles, forming an axial working air gap. The permanent magnet is magnetized perpendicularly to the pole axis and is arranged radially outside of the armature, and the armature lateral surface facing the permanent magnet forms a radial air gap, via which the armature is magnetically coupled to the permanent magnet. The axial thickness of the permanent magnet is equal to or greater than the axial distance between the two poles.

Abstract: An electromagnetic signal converter for a bone conduction receiver includes a soft-magnetic armature which is moveable relative to a pole that supports an electric coil, a permanent magnet, and a soft-magnetic yoke which forms a magnetic circuit with the permanent magnet, the pole, and the armature. First and second poles are provided, each having an electric coil. Both poles have an identical design and are arranged symmetrically on a common pole axis. The armature is arranged between the two poles, forming an axial working air gap. The permanent magnet is magnetized perpendicularly to the pole axis and is arranged radially outside of the armature, and the armature lateral surface facing the permanent magnet forms a radial air gap, via which the armature is magnetically coupled to the permanent magnet. The axial thickness of the permanent magnet is equal to or greater than the axial distance between the two poles.