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JPS55165583

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DESCRIPTION JPS55165583
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a general
electro-acoustic transducer, FIG. 2 is an enlarged cross-sectional view of the relevant part, and
FIG. 3 is an embodiment of the electro-acoustic transducer of the present invention. It is an
expanded sectional view of an important section showing. 1 ...... sound hole, 2 ...... yoke, 3 ......
strip magnets, 4.5 ...... spacer, 6 ...... bis, 7 ииииииии Magnetic circuit, 8 ииииииииииииииииииииииииииии Diaphragm, 10
иииииииииииииииииииииииииииии Dustproof net.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a full-drive
electroacoustic transducer in which a printed coil is provided on a diaphragm and a magnetic
circuit in which a plurality of strip-shaped magnets are arranged side by side is disposed
opposite to the diaphragm. In particular, the outer surface of the magnetic circuit is covered with
a dustproof net having a high magnetic permeability to reduce the leakage flux and attempt to
improve the efficiency of the magnetosphere path. This type of electro-acoustic transducer of a
general type, such as /, J) 332 is configured as shown in FIG. That is, a plurality of strip-like
magnets 3 such as rod-like magnets attached in parallel or concentrically on one surface of a flat
plate-like yoke 20 having a large number of sound release holes 1 is attached with a screw 6 A
magnetic circuit 7 is configured, and a flat diaphragm 9 having a printed coil 8 formed in the
middle of the facing surface of the Macnet 3 of the magnetic circuit 7 is attached and configured
to be held between the spacers 4 and 5 There is. In this configuration, the magnetic fluxes
emitted from the magnets 3 alternately having different magnetization directions are bent at a
right angle because the opposing magnetic poles are the same poles as shown in FIG. 2 and
parallel to the opposing surface of the magnet 3 It is made to turn to reach the magnet 3 of the
adjacent different magnetic pole. On the other hand, since current flows in the printed coil 8 of
the diaphragm 9 disposed in the middle of the opposing air gap in the direction passing through
the paper of FIG. It occurs. (3) The speaker of this configuration has the feature that high
frequency reproduction is good because it is a vibration system or light weight, but the magnetic
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circuit 7 is close and the leakage flux is large as shown in A in FIG. It is inefficient in use,
expensive and heavy (it has the drawback of becoming heavy. The present invention eliminates
the conventional drawbacks such as -L. Hereinafter, an embodiment of the present invention will
be described with reference to FIG. The basic structure of the electroacoustic transducer is the
same as that shown in FIG. 1, and FIG. 3 shows the main part thereof. The novel point is that the
outer surface of the yoke 2 is made of high permeability material such as iron. The dustproof net
10 constructed in this way is covered, and the leakage flux flux leaking out of the yoke 2 is
focused on this dustproof net 1o to be fed back to the magnetic circuit 7 to improve the
efficiency of the magnetic circuit 7 The sound emission is not adversely affected, and it is
configured to prevent the intrusion of dust such as iron powder from the outside into the
vibrating part. As described above, the electroacoustic transducer according to the present
invention has a dustproof net with high permeability and 4 ratio on the outer surface of the
magnetic circuit to dramatically reduce the leakage flux from the magnetic circuit and feed the
converged magnetic flux to the magnetic circuit. Can effectively use the magnetic flux to increase
the efficiency, prevent the intrusion of external dust particles etc. into the vibrating part, prolong
the service life, and stabilize the quality, resulting in greater practical value It is.
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