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 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;
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.
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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.
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Citations
12 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 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; 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. - View Dependent Claims (2, 3, 4, 5)
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6. A membrane system module for an electrodynamic transducer, comprising:
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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 its lower side an annular recess. - View Dependent Claims (7, 10, 11, 12)
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8. A magnet system module for an electrodynamic transducer, comprising:
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a pole plate, 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 plate, 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 has an upwardly directed circumferential shoulder outside the yoke. - View Dependent Claims (9)
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Specification