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DESCRIPTION JPS5585195

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DESCRIPTION JPS5585195
Description 1, title of the invention
スピーカ
3. Detailed Description of the Invention The present invention relates to a speaker with reduced
reproduction distortion of sound. A conventional loudspeaker, here an internal magnet
loudspeaker, is shown in FIG. In this figure, 1 is an upper plate, 2 is a yoke, 3 is a lower plate, 4 is
a permanent magnet, 5 is a pole, 6 Fi is a chair coil, and 7 is a gap. Next, the operation of such a
conventional one will be described. That is, the DC magnetic flux from the permanent magnet 4
circulates through the magnetic circuit through the air gap 7 in which the chair coil 6 is inserted.
また、? A current proportional to the voice flows through the chair coil 6, and an
electromagnetic force works between the current and the DC magnetic flux, whereby the siphone
coil 6 vibrates up and down to reproduce sound. At this time, a part of the pole 5 near the chair
coil 6 and a part of the upper plate 1 are alternately magnetized by a voice current (hereinafter
also referred to as a voice coil current) flowing through the chair coil 6, and a large amount of
this is generated by the chair coil current. The magnetic field and the magnetic flux are biased by
the permanent magnet 4 to form minor hysteresis lousos (see FIG. 2). However, in the abovementioned prior art, since mild steel (for example, 8841) is usually used as the magnetic body,
the above-mentioned minor hysteresis and rusiver nonlinear characteristics and distortion of the
cais coil current make it impossible to reproduce faithful sound. was there. The present invention
has been made to eliminate the above-mentioned drawbacks, and it is an object of the present
invention to provide a speaker which can reproduce faithful sound with less distortion.
スピーカ
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EndPage: The present invention will be described in detail with reference to FIGS. 3 to 5 below.
FIG. 3 is a cross-sectional view showing an embodiment of the loudspeaker according to the
present invention, wherein 1 is an upper plate, 2 is a yoke, 3 is a lower plate, 4 is a permanent
magnet, 5 is a pole, 6 is a discoil, 7 is Is a void. Reference numeral 8 denotes an annular
magnetic body having excellent linearity of the magnetic characteristics, which is fitted to the
portion of the upper plate 1 facing the voice coil 6. In this case, the magnetic body 8 is formed by
performing appropriate processing and heat treatment on a mild steel such as a low carbon steel,
so that cementite (Fe8C) having a saturation magnetization lower than that of the matrix is iron
(Fe in the matrix). And a magnetic material formed by dispersing a metal structure dispersed so
as to surround the The reference numeral 9 denotes a magnetic body similar to the magnetic
body 8 in which the pole 5 is fitted to a portion facing the chair coil 6. FIG. 4 is a cross-sectional
view showing another embodiment of the present invention, in which 5 'is a pole formed of the
same magnetic material as the magnetic materials 8 and 9 described above. The other reference
numerals are the same as in FIG. That is, conventionally, as described above as a speaker
magnetic circuit component member, a mild steel such as 8841 is usually used, but the
hysteresis loop of this mild steel has a residual magnetic flux density as shown by curve (a) in
FIG. Indicates a fairly high, non-linear characteristic. In order to improve the linearity of the
magnetic characteristics, a magnetic air gap is provided in the direction of the magnetic flux as
represented by a reactor to reduce the residual magnetic flux density, and the hysteresis
characteristics as shown by curve (b) in FIG. It is effective to use a magnetic material. Therefore,
current distortion can be reduced by providing a magnetic air gap in the direction in which the
magnetic flux generated by the voice coil current passes. The present invention achieves the
reduction of the strain described above in the metallurgical manner as described below. That is,
the inventors of the present invention found that a cementite (Fe, C) having a spontaneous
magnetization of about half of the spontaneous magnetization of iron (Fe) when subjected to an
appropriate machining and heat treatment to a mild steel such as low carbon steel In the
magnetic material in which a metal structure dispersed to surround iron (Fe) of the matrix is
formed, and such a metal structure is formed, the cementite layer is saturated by the
spontaneous magnetization of iron and is effective inside the metal. It has been found that the
hysteresis loop is improved as shown by the curve (b) in FIG. Therefore, if such a magnetic
material is used as shown in FIGS. 3 and 4, the reproduction distortion of sound can be reduced.
Next, a specific example of a method of manufacturing such a magnetic body will be described.
That is, commercially available low carbon steel (C:
0.15%, Si: <o, io%, Mn: o, so @, P: <0.04 qb, 8: <0.04%, d), <: Sail 03%) 60 t of cold The cementite
(Fe (Fe)) is obtained by repeating the heat treatment cycle of holding for 30 minutes at each
temperature immediately above (760 ° C.) and immediately below (700 ° C.) the A1
transformation point (723 ° C.). , C) are spheroidized in ferrite to form a dispersed metal
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structure, and a magnetic body having a hysteresis loop characteristic shown by curve ←) in FIG.
5 is obtained. In the above-described embodiment, although the low-carbon steel is used as the
material and the heat treatment is performed in a heat cycle in the cold working, the A plate
transformation point right above, and the heat cycle right below, it is not limited thereto. For the
material, mild steel other than low carbon steel, for example, soft copper containing one or more
alloying elements such as Cr may be used, or it may be manufactured by appropriately
combining various plastic working, heat treatment, etc. The magnetic material having the same
effect as the above embodiment can be obtained by the method. As described above, according to
the present invention, cementite (F ′ ′ e, C) has a saturation magnetization lower than that of
the matrix by performing appropriate processing and heat treatment on a mild steel such as a
low carbon steel. Use a magnetic material having hysteresis characteristics as shown in curve (b)
in FIG. 5, partially or entirely, forming a dispersed metal structure so as to surround iron (Fe) in
the matrix phase. Since the magnetic circuit is configured, there is an effect that a speaker
capable of reproducing low distortion sound can be obtained inexpensively.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of a conventional speaker,
FIG. 2 is a diagram showing a minor hysteresis loop in which DC flux from permanent magnets in
the speaker is formed by magnetic flux from chair coil current. FIG. 4 is a cross-sectional view
showing an embodiment of a speaker according to the present invention, FIG. 4 is a crosssectional view showing another embodiment of the same EndPage: FIG. 5 is a normal hysteresis
loop and a magnetic material used in the present invention. It is a figure which shows a
hysteresis loop. 1.3 · · · upper plate, lower plate, 2 ... yoke, 4 ... permanent magnet, 5.5 '... pole, 6
... voice coil, 7 ... air gap, 8, 9: Magnetic material. In the figure, the same reference numerals
indicate the same parts-the same parts as shown in the figure. 0 agent Noboru Ogino-Fig. 1 Fig. 2
Fig. 5 Fig. 5 End Page 3
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