SU1379944A1 - Acoustical-electrical transducer of orthodynamic type - Google Patents

Abstract

The invention relates to electrical engineering and allows to reduce the cost of the converter by simplifying the shape of the magnet and to increase the conversion efficiency by improving the symmetry of the magnetic field. In the magnetic system of the transducer, the magnets 2 are in the form of tiles, equipped with magnetic conductors 3 in the form of coaxial, gaps 5 insulated from each other rings. The magneto wires provide azimuthal uniformity of the magnetic field during each period of its change along the membrane with voice coils. 3 il. CL co with UD J 4;

Description

The invention relates to electrical engineering, in particular, to the design of devices for converting electrical signals into acoustic ones and can be used to create headphones of orthodynamic type, as well as planar electroacoustic transducers, including Stereo.

The purpose of the invention is to reduce the cost of the converter by simplifying the shape of the magnet and increasing the efficiency of the converter by improving the symmetry of the magnetic field.

FIG. 1 shows the proposed converter, top view; FIG. 2 shows section A-A in FIG. one; in fig. 3 - transducer, side view.

Electroacoustic transducer consists of a membrane 1 with voice coils installed in the middle of the disk gap of the magnetic system of two magnets 2 equipped with magnetic cores 3. Magnets 2 are opposite to each other with a gap of 4. The number of poles of different signs on the magnets 2 is equal to the number of voice coils on the membrane 1. The direction of magnetization of the magnets 2 in the figures is explained by the designations from the poles - N and S. The magnets 2 have the simplest form for making - a plate with one polished surface facing the gap 4.

Electro-acoustic transducer works as follows.

Electrocurrent is applied to the voice coils of the membrane 1. Interaction current0

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It operates with the magnetic field component, parallel to the membrane plane.

The azimuthal uniformity of the magnetic field in each of its periods of change along the diameter of the membrane is provided by the magnetic cores 3. Sound from the oscillations of the membrane passes unhindered through the gaps 5 between the magnetic cores.

For devices in which azimuthal magnetic field uniformity is necessary, each magnet 2 should be magnetized strictly oppositely, perpendicularly to the pole planes, and on the side opposite to the annular magnetic cores 3, close the magnets 2 with additional plate magnetic circuits.

Claims (1)

Invention Formula An electro-acoustic transducer of orthodynamic type, containing a membrane with voice coils, installed in the working gap of a magnetic system pierced by through channels-sound conductors of magnets magnetized in sections, each section opposite to the previous one and magnetic circuits, characterized in that in order to reduce the cost of the converter due to simplify the shape of the magnets and improve the efficiency of the converter by improving the symmetry of the magnetic field, the magnets are in the form of tiles, and m from the working air gap in the magnetic cores are made vide.soosnyh isolated from each other rings. zigg Figz