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DESCRIPTION JPS58206298

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DESCRIPTION JPS58206298
[0001]
The present invention relates to a magnetic circuit for a dynamic speaker, in particular, capable
of easily reducing current distortion due to non-linearity of magnetic permeability of the
magnetic circuit. In general, it is known that distortion occurs in the current flowing through the
voice coil because the speaker magnetic circuit is non-linear in permeability of the magnetic
body. The occurrence of such distortion differs depending on which part of the dynamic speaker
magnetic circuit the magnetic flux generated by the voice current flowing through the voice coil
traces, and in particular when passing through a permanent magnet, the second harmonic The
outbreak is awful. As a speaker magnetic circuit for reducing current distortion of a voice coil
caused by such non-linearity of magnetic permeability, there is a conventional one shown in FIG.
First, the conventional example of FIG. 1 will be described. 1 is a plate, 2 is a cylindrical
permanent magnet, 3 is a pole piece, 4 is a voice coil, and 5 is a copper or aluminum short ring
provided on the inner surface of the cylindrical permanent magnet 2. In the magnetic circuit for
a dynamic speaker having the above-described configuration, since the AC magnetic flux based
on the voice flowing in the voice coil 4 passes through the plate 19 cylindrical permanent stone
2 and the pole piece 3, the shorting ring 5 Induced current flows, the magnetic flux based on the
induced 4 current is in the opposite direction to the parent magnetic flux, and the two cancel
each other, and the magnetic flux passing through the cylindrical permanent magnet 2 decreases
significantly, and the change in the magnetic flux The amount of change in the inductance of the
voice coil 4 caused by the magnetic flux passing through it becomes small, so that the current
distortion due to the second harmonic is reduced and the fidelity proportional to the applied
audio voltage is high. Driving force is obtained. However, in the above-described conventional
example, the short ring 5 has to be separately manufactured, and the iodine ring 5 needs to be
fitted into the pole piece 3, so that high mounting accuracy must be ensured, and There are a
number of disadvantages associated with the increase in the number of processes. The present
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1
invention has been made to eliminate the drawbacks of the conventional magnetic for a dynamic
speaker [L; one path as described above, such as copper, aluminum, etc. functioning as a short
ring by plasma spraying on the side surface of the permanent magnet. An object of the present
invention is to obtain a magnetic circuit for a dynamic speaker in which the process is simplified
and the number of processes is greatly reduced by forming the coating layer, and the current
distortion can be easily reduced. The second embodiment of the present invention will be
described above.
The same structure as that of the dynamic speaker magnetic circuit of the prior art, and the
corresponding parts are denoted by the same reference numerals. In the drawings, reference
numeral 6 denotes a coating layer formed by plasma spraying using a metal filler such as copper
and aluminum. The coating layer 6 is formed on the inner surface of the cylindrical permanent
magnet 2 by plasma spraying in one step. As described above, since the gold coating layer 6 is
formed on the inner side surface of the cylindrical permanent magnet 2. The voice coil 4
generates less% a distortion, and hence a driving force proportional to the audio voltage can be
obtained. At this time, the coating layer 6 is excellent if it acts as a secondary winding of a voice
coil. Although the embodiment of FIG. 2 described above shows the magnetic circuit for the
dynamic speaker of the Tosoura magnetic type, the other case of applying to the magnetic circuit
for the dynamic speaker of the internal magnet type in FIG. An example of In the drawings, 7
indicates a yoke, 8 indicates a cylindrical permanent 94 stone, and 9 indicates a center ball. And
lO is a coating layer formed by plasma spraying with synthetic fiber materials such as copper and
aluminum on the outer surface 1111 of the cylindrical permanent magnet. Since the coating
layer lO is formed by plasma spraying on the outer surface of the cylindrical permanent (hollow)
stone 8 as in the oblique direction, even if the permeability of the magnetic substance is nonlinear, the magnetic flux traced there The generation of the second harmonic that occurs is
suppressed, current distortion due to this is reduced, and a high-fidelity driving force
proportional to the applied voltage of the voice coil 4 is obtained. According to the present
invention, a magnetic circuit for a dynamic speaker with less current distortion only by forming a
coating layer made of a metal material such as copper and aluminum by plasma spraying on the
side surface of a permanent magnet constituting the magnetic circuit for a dynamic speaker.
There is an advantage that the number of steps in the 5 assembly can be reduced and the
operation can be easily performed.
[0002]
Brief description of the drawings
[0003]
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2
vJ1 is a cross-sectional view of a conventional magnetic circuit for a dynamic speaker provided
with a short ring, and FIGS. 2 and 3 are two embodiments of a magnetic circuit for a dynamic
speaker provided with a coating layer according to the present invention. It is cross-sectional
explanatory drawing shown.
1 ......... plate 2 ......... cylindrical permanent magnet 3 ......... pole piece 4 ......... voice coil 5 ииииииииииииииииии
Short ring 6.10 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Cylindrical permanent magnet 9
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ии Or 1 person)
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3
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