Abstract: A method for manufacturing an electrodynamic transducer from a membrane system module and a magnet system module is disclosed. The membrane system module comprises an annular first chassis unit made by injection-molding and a diaphragm fixed thereon. A coil is fixed on a coil seat of the diaphragm. The magnet system module comprises a pole piece, a magnet and a yoke that each have a central hole, and a second chassis unit that is made by injection-molding and that fills the central holes in the pole piece, the magnet and the yoke. It surrounds the yoke at least partially, so that the pole piece, the magnet and the yoke are held. In the transducer, the membrane system module and the magnet system module are plugged together, wherein an annular recess on the lower side of the first chassis unit is arranged on a circumferential shoulder of the second chassis unit. This defines a position of the coil relative to the pole piece, to the magnet and to the yoke of the magnet system module.

Abstract: A method for manufacturing an electrodynamic transducer from a membrane system module and a magnet system module is disclosed. The membrane system module comprises an annular first chassis unit made by injection-molding and a diaphragm fixed thereon. A coil is fixed on a coil seat of the diaphragm. The magnet system module comprises a pole piece, a magnet and a yoke that each have a central hole, and a second chassis unit that is made by injection-molding and that fills the central holes in the pole piece, the magnet and the yoke. It surrounds the yoke at least partially, so that the pole piece, the magnet and the yoke are held. In the transducer, the membrane system module and the magnet system module are plugged together, wherein an annular recess on the lower side of the first chassis unit is arranged on a circumferential shoulder of the second chassis unit. This defines a position of the coil relative to the pole piece, to the magnet and to the yoke of the magnet system module.

Abstract: A microphone having a microphone capsule is provided. The microphone capsule has a diaphragm carrier, a diaphragm and an adhesive tape ring which is used to fasten the diaphragm to or in the diaphragm carrier. The microphone capsule is in the form of a dynamic sound transducer. A dynamic sound transducer for headphones, earphones or headsets is also provided. The sound transducer has a diaphragm carrier, a diaphragm and a moving coil which is coupled to the diaphragm. In a similar manner to the microphone capsule, the sound transducer has an adhesive tape ring between the diaphragm and the diaphragm carrier, which ring is used to fasten the diaphragm to the diaphragm carrier.

Abstract: A microphone having a microphone capsule (10) is provided. The microphone capsule (10) has a diaphragm carrier (40), a diaphragm (20) and an adhesive tape ring (30) which is used to fasten the diaphragm (20) to or in the diaphragm carrier (40). The microphone capsule (10) is in the form of a dynamic sound transducer. A dynamic sound transducer for headphones, earphones or headsets is also provided. The sound transducer has a diaphragm carrier (40), a diaphragm (20) and a moving coil (22) which is coupled to the diaphragm. In a similar manner to the microphone capsule, the sound transducer has an adhesive tape ring (30) between the diaphragm (20) and the diaphragm carrier, which ring is used to fasten the diaphragm (20) to the diaphragm carrier (40).

Abstract: An improved inversion process for the preparation of a paper sizing agent which is an aqueous dispersion containing a high content of free rosin in the form of fortified rosin and/or non-fortified rosin, water, and an anionic dispersing agent is disclosed. The improvement comprises using as the dispersing agent a polyethoxylated, sulfated rosin or a derivative thereof. There is also disclosed an aqueous dispersion useful as a paper sizing agent comprising from about 10 to about 60% of fortified and/or non-fortified rosin, from about 1 to about 10% of a polyethoxylated, sulfated rosin or a derivative thereof, based on the total weight of all solids in the dispersion, and a sufficient amount of water to form a dispersion.