Electrodynamic sound transducer
An electrodynamic sound transducer that includes a chassis, a membrane with a hole in the centre of the membrane, a moving coil, a magnetic system, and a resonator that is placed in the hole in the centre of the membrane.
1. An earphone comprising:
an electrodynamic sound transducer comprising:
a chassis with an inner open end and an outer end;
a membrane with a hole in a center of the membrane and a coil seat, wherein the membrane is fastened to the inner open end and the outer end;
a moving coil, which is coupled to the membrane at the coil seat;
a magnetic system; and
a resonator, which is formed in the inner open end of the chassis and in the hole in the center of the membrane;
wherein the resonator has:
a first end with an opening on an ear-side end of the electrodynamic sound transducer;
a second end on a side of the electrodynamic sound transducer facing away from the ear; and
a volume between the first end and the second end;
wherein the second end is closed;
wherein the resonator is configured as an acoustic absorption circuit or as a Helmholtz resonator.
2. The electrodynamic sound transducer according to claim 1 ;
wherein the opening is smaller than the hole in the center of the membrane.
3. The electrodynamic sound transducer according to claim 1 ;
wherein the first end with the opening is located in a plane of the membrane.
4. The electrodynamic sound transducer according to claim 1 ;
wherein an acoustic resistance element is provided at the opening.