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DESCRIPTION JPS61156999

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DESCRIPTION JPS61156999
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker unit that realizes improvement in input resistance and linearity of the speaker unit. 2.
Related Art Generally, in the conventional speaker unit, as shown in FIG. 4 and FIG. 6, the relative
heights of the toe knob plate 1 and the center pole 3 are the same height and the same surface.
なお2はマグネット、4はボイスコイルである。 5 and 7 are enlarged views of the main parts
showing the relationship between the magnetic field 5 and the voice coil. Also, in recent years,
the output of the power amplifier has become large, and accordingly, it is necessary to improve
the input resistance performance of the speaker unit itself and to improve the linearity. Problem
to be Solved by the Invention As a method of improving the input resistance performance of the
speaker unit, a method of physically increasing the heat radiation area of the voice coil is taken.
As a specific example, there is one in which the voice coil diameter of the speaker unit is
increased, but there is a drawback that it is expensive, and there is one in which the gap width of
the opposing top plate and center hole is reduced. This may cause a collision between the gap
and the voice coil, which makes it difficult to control the accuracy. In addition, there is one that is
filled with a magnetic fluid or the like to improve the thermal conductivity to the top plate and
the center pole. However, this also has a limit (150 ° C.) in the temperature rise value of the
magnetic fluid. There were various improvement methods above, but each is price side. There
was a problem in terms of characteristics. SUMMARY OF THE INVENTION The present invention
provides an inexpensive speaker unit which solves such conventional problems and
simultaneously solves the improvement of the similarity performance of the speaker unit.
SUMMARY OF THE INVENTION In the present invention, the upper end of the center pole is
raised relative to the top plate in the field section of the speaker unit. By using this configuration,
the physical heat dissipation area of the voice coil bobbin can be increased, and the equivalent
range of the magnetic line strength of the upper and lower ends of the voice coil placed in the
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1
magnetic field can be expanded to improve the linearity of the speaker unit. EXAMPLE One
example of the present invention will be described below. FIG. 1 is a cross-sectional view of a
field unit of a speaker unit according to an embodiment of the present invention, and FIG. 2 is an
enlarged view showing the relationship between a magnetic field and a voice coil. In the present
embodiment, the height position of the center pole 3 relative to the top plate 1 is increased. As a
result, when the top plate thickness is 5 m and the voice coil diameter is 20 mm, and the coil
winding width is 7 wn, in the present embodiment (FIG. 1), in the conventional example (FIG. 4,
FIG. 6) The area opposite to is as shown in the following table.
In the case of the speaker unit of the present invention of FIG. 1, the center pole 3 is 1 mm
higher than the top plate 1, but the effective heat dissipation area is about 17 more than that of
the general speaker unit shown in FIG. It is clear that Furthermore, the effective heat radiation
area is greatly increased as compared with the one provided with the linearity improved type Ttype pole piece shown in FIG. Although the difference also depends on the material of the bobbin
of the voice coil to be used, it is more effective to increase the pole piece for the heat radiation
effective area where the bobbin is opposed to the pole piece. The input-proof characteristic of the
voice coil of the field part of the general speaker unit shown in FIG. 6 is compared. As described
above, according to the configuration of the present embodiment, input resistance characteristics
can be improved without changing the voice coil diameter of the speaker unit. At the same time,
by raising the center pole, the range which can be placed in the magnetic field lines of the voice
coil can be broadened (FIG. 2), and the linearity of the speaker unit can be improved. Effect of the
Invention Since the present invention is such that the upper end of the center pole is higher than
the upper end of the top plate, the input resistance improvement and the linearity improvement
can be made inexpensively and extremely effective without increasing the diameter of the voice
coil. is there,
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of the field portion of the speaker unit according to an embodiment of
the present invention, FIG. 2 is an enlarged view of the main parts, FIG. 3 is an input resistance
characteristic diagram, and FIG. FIG. 5 is a cross-sectional view of a field unit of a speaker unit
using a piece, FIG. 5 is an enlarged view thereof, FIG. 6 is a cross-sectional view of a field unit of a
conventional speaker unit, and FIG.
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1・・・・・・トッププレート、2・・・・・・マクネット、3・・・・・・センターポール、
4・・・・・・ボイスマイル。 Name of Agent Attorney Nakao Toshio and 1 other person 3J1
Fig. L Tobf 1-t Fig. 4 Fig. 5 Fig. 6
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