Low-radiation electromagnetic earpiece
View Patent ↗In an electromagnetic earpiece with a housing in which a coil through which an energizing current flows as well as a membrane are arranged such that the membrane can be excited to vibrate as a result of the energizing current, the parasitic leakage field generated by the electromagnetic earpiece is be reduced. This is accomplished by internally-running connection lines optimally close together between the ends of the coil and the electrical connections of the electromagnetic earpiece so that the leakage field thereby generated is kept optimally low according to the physical principle of a double conductor, producing an advantageous electromagnetic earpiece in a hearing aid device.
1. An electromagnetic earpiece, comprising:
a housing comprising electrical connections;
a coil configured to conduct energizing current flowing through it, the coil comprising coil ends;
a membrane configured to oscillate as a result of the energizing current; and
internal connection lines that are twisted together at least in sections, and that are routed from the coil ends of the coil to the electrical connections on the housing, with a first of said internal connection lines located at a substantially proximate distance to a second of said internal connection lines for a major portion of either the first of the internal connection lines or the second of the internal connection lines routing from the coil ends to the electrical connections;
the coil, the membrane, and the internal connection lines all being located within the housing.
2. The electromagnetic earpiece according to claim 1 , wherein the substantially proximate distance is a distance sufficient to cause the magnetic fields created thereby to largely compensate one another.
3. The electromagnetic earpiece according to claim 1 , wherein the sections comprise substantially all of a region from a first coil end to one of the electrical connections on the housing.