Electrodynamic transducer and method for manufacturing an electrodynamic transducer
First Claim
1. A method for manufacturing an electrodynamic transducer comprising:
- producing an annular first chassis unit by injection-molding a first annular cavity of a first injection-molding tool with plastic, wherein the first annular cavity results from placing a first portion of the first injection-molding tool on a second portion of the first injection-molding tool, the first portion of the first injection-molding tool having a first annular recess and the second portion of the first injection-molding tool having a second annular recess;
placing a coil on a mandrel;
placing the first chassis unit on the mandrel such that the coil is surrounded by the first chassis unit; and
placing and gluing a vibratory diaphragm on the first chassis unit and on the coil, wherein a first module of the electrodynamic transducer is obtained;
producing an annular second chassis unit by placing a pole piece, a magnet and a yoke in a first portion of a second injection-molding tool, the first portion of the second injection-molding tool having a first annular recess, wherein the pole piece, the magnet and the yoke each have a central hole;
placing a second portion of the second injection-molding tool on the first portion of the first injection-molding tool, the second portion of the second injection-molding tool having a second annular recess, and injection-molding a cavity defined by the first and second recesses in the second injection-molding tool with plastic, wherein after hardening of the injected plastic a second chassis unit is obtained, and wherein the second chassis unit is rotationally symmetrical;
wherein the second chassis unit fills the holes in the pole piece, the magnet and the yoke such that the pole piece, the magnet and the yoke are joined together by the injected second chassis unit, and wherein a second module of the electrodynamic transducer is obtained; and
joining the first module and the second module to obtain the electrodynamic transducer,wherein the first chassis unit has connection portions for electrically connecting the coil, the connection portions passing the second chassis unit laterally; and
wherein no rotational alignment of the first module or the second module is performed for the joining.
1 Assignment
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Accused Products
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.
16 Citations
17 Claims
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1. A method for manufacturing an electrodynamic transducer comprising:
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producing an annular first chassis unit by injection-molding a first annular cavity of a first injection-molding tool with plastic, wherein the first annular cavity results from placing a first portion of the first injection-molding tool on a second portion of the first injection-molding tool, the first portion of the first injection-molding tool having a first annular recess and the second portion of the first injection-molding tool having a second annular recess; placing a coil on a mandrel; placing the first chassis unit on the mandrel such that the coil is surrounded by the first chassis unit; and placing and gluing a vibratory diaphragm on the first chassis unit and on the coil, wherein a first module of the electrodynamic transducer is obtained; producing an annular second chassis unit by placing a pole piece, a magnet and a yoke in a first portion of a second injection-molding tool, the first portion of the second injection-molding tool having a first annular recess, wherein the pole piece, the magnet and the yoke each have a central hole; placing a second portion of the second injection-molding tool on the first portion of the first injection-molding tool, the second portion of the second injection-molding tool having a second annular recess, and injection-molding a cavity defined by the first and second recesses in the second injection-molding tool with plastic, wherein after hardening of the injected plastic a second chassis unit is obtained, and wherein the second chassis unit is rotationally symmetrical; wherein the second chassis unit fills the holes in the pole piece, the magnet and the yoke such that the pole piece, the magnet and the yoke are joined together by the injected second chassis unit, and wherein a second module of the electrodynamic transducer is obtained; and joining the first module and the second module to obtain the electrodynamic transducer, wherein the first chassis unit has connection portions for electrically connecting the coil, the connection portions passing the second chassis unit laterally; and wherein no rotational alignment of the first module or the second module is performed for the joining. - View Dependent Claims (2, 3, 4, 5, 11, 12, 13)
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6. An electrodynamic transducer comprising:
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a membrane system module; and a rotationally symmetric magnet system module having an outer radius; wherein the membrane system module comprises; a first annular chassis unit made by injection-molding and a diaphragm that is fixed on the first chassis unit; and at least one contact strip that is embedded in the first chassis unit during injection-molding, the at least one contact strip having a connection portion; wherein the diaphragm has a coil seat on which a coil is fixed, the coil being electrically connected to the connection portion of the at least one contact strip, and wherein the first chassis unit has on its lower side an annular recess; wherein the rotationally symmetric magnet system module comprises; a pole piece, a magnet and a yoke, each having a central hole; and a second chassis unit made by injection-molding and filling the central holes in the pole piece, the magnet and the yoke and at least partially surrounding the yoke so that the pole piece, the magnet and the yoke are held by the second chassis unit, wherein the second chassis unit is rotationally symmetric; wherein the second chassis unit has an upwardly directed circumferential shoulder outside the yoke; and wherein the second chassis unit has a mushroom-shaped dome above the pole piece; and wherein the membrane system module and the magnet system module are put together without rotational alignment and the annular recess of the first chassis unit of the membrane system module is arranged on the circumferential shoulder of the second chassis unit of the magnet system module, so as to define a position of the coil of the membrane system module relative to at least one of the pole piece, the magnet and the yoke of the magnet system module. - View Dependent Claims (7, 14, 15)
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8. An electrodynamic transducer, comprising:
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a membrane system module; and a rotationally symmetric magnet system module; wherein the membrane system module comprises; a first annular chassis unit made by injection-molding and a diaphragm that is fixed on the first chassis unit, wherein the diaphragm has a coil seat on which a coil is fixed, and wherein the first chassis unit has, on a side opposite the diaphragm, an annular recess; wherein the rotationally symmetric magnet system module comprises; a pole piece, a magnet and a yoke that each have a central hole; and a second chassis unit made by injection-molding and filling the central holes in the pole piece, the magnet and the yoke; wherein the second chassis unit at least partially surrounds the yoke so that the pole piece, the magnet and the yoke are held by the second chassis unit, and wherein a magnetic gap results at least between the yoke and the pole piece; wherein the second chassis unit has a circumferential shoulder outside the yoke, and wherein the second chassis unit has a mushroom-shaped dome above the pole piece; wherein the membrane system module and the magnet system module are arranged on each other without rotational alignment such that the annular recess of the first chassis unit matches the circumferential shoulder of the second chassis unit, whereby the coil of the membrane system module takes a defined position within said magnetic gap of the magnet system module. - View Dependent Claims (9, 10, 16, 17)
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Specification