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JPS55165582

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS55165582
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a general electroacoustic
transducer, FIG. 2 is a cross sectional view thereof, FIG. 3 is an enlarged cross sectional view of
the main portion thereof, and FIG. The principal part expanded sectional view of a converter, FIG.
5 is the principal part expanded sectional view which shows one Example of the electroacoustic
transducer of this invention. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ...... 4 to 5
DETAILED DESCRIPTION OF THE INVENTION In the present invention, diaphragms having a
printed coil are arranged in a plurality of stripe magnets having different magnetization
directions alternately arranged in a plurality of stripes, in a row or concentric circles, with a fixed
interval. Relating to an electro-acoustic transducer which is arranged in the middle of the
oppositely arranged magnetic circuit and which has a configuration of 7 '/ A <-, s-, 22 It is an
object of the present invention to provide a high-permeability member by increasing the
magnetic flux density acting on the printed coil by providing a high-permeability member in the
shape of a circle. Generally, this kind of electro-acoustic transducer is the 11S? l, it was
configured as shown in FIG. That is, a strip-like or link-like strip-like magnet 3 is alternately fixed
in parallel or concentrically on one side of a flat plate-like yoke 2 in which several sound release
holes 1 are formed. Are connected by screws 6 and nuts 7 so that the two magnets 3 face each
other at a constant interval using frame-like spacers 4 and 5 to form a magnetic circuit 8. A flat
diaphragm 1o made of a film or the like having a printed coil 9 is disposed in the middle of the
facing gap, and the peripheral edge portion of the diaphragm 1o is sandwiched between the
spacers 4 and 5 and fixed. In this configuration, the operation will be described with reference to
the enlarged cross sectional view of FIG. 3-). The magnetic flux emitted from the magnet 3 is bent
in the direction or right angle because the magnetic poles facing the pair 3 are the same type. It
is turned to be parallel to the facing surface of the magnet 30 and reaches the magnet 3 of the
adjacent different magnetic pole. On the other hand, since current flows in the direction of
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penetrating the paper surface of FIG. 3 to the printed coil 9 of the diaphragm 1 ° disposed in
the middle of the opposing air gap, the printed coil 9 acts vertically in the vertical direction A
driving force is generated to vibrate the diaphragm 1o to generate a sound. The speaker having
such a configuration has a characteristic that the vibration system is light in weight, so that it is
good for antacid regeneration or it is close to an open magnetic circuit due to the structure of the
magnetic circuit 8 and as shown in FIG. The magnetic flux coming out of the surface is scattered
between the magnets 3 and there is much magnetic flux A which does not effectively act on the
printed coil 9, and the utilization efficiency of the magnetic flux of the magnets is extremely poor.
There is a drawback that it becomes expensive, large and heavy, and it becomes heavy. The
present invention also eliminates the conventional drawbacks of the following ten. 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 FIGS. 1 and 2, and FIG. 6
is an enlarged sectional view showing only the characteristic part of the present invention.
That is, according to the present invention, a high permeability member 11 such as iron or
permalloy in the shape of a broken ml or U is cut on the end face of the magnet 3 facing the
diaphragm 1 ° toward the diaphragm 10 with the projecting portions 11a and 11b at both ends.
It adheres so as to protrude, and the magnetic flux of the magnet 3 converges on the projecting
portions 11 a and 11 b of the high magnetic permeability member 11 so as to effectively act on
the printed coil 9. The magnetic flux density acting on this printed coil 9 can be greatly increased
to 2200 gauss according to the present invention if it is the conventional one or 1500 gauss, and
as a result of that, the output sound pressure level approaches 3 dB (increases, ) I was able to. As
described above, the electroacoustic transducer according to the present invention can increase
the effective magnetic flux acting on the printed coil by incorporating a high permeability
member having a U-shaped cross section into the magnet, thereby improving efficiency. As a
result, it has advantages such as being able to use a low-priced magnet as a magnet and to be
miniaturized, and is of great practical value.
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