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JPS57135196

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DESCRIPTION JPS57135196
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a
vibration system of a conventional speaker, FIG. 2 is a longitudinal sectional view showing a
vibration system of a loudspeaker according to a first embodiment of the present invention, and
FIG. 4 to 10 show the vibration system of the loudspeaker according to the second to eighth
embodiments of the present invention. It is a longitudinal cross-sectional view. 1 ... diaphragm, 2
... povin, 3 ... voice coil, 4 ... loss body. In the drawings, the same reference numerals indicate the
same or corresponding parts.
[Detailed Description of the Invention] This invention comprises a discoil, a diaphragm, and this
pair of plates. -4,7,) (IIG; voice coil pintora integrally formed with the diaphragm relates to the
improvement of the vibration system of the speaker 0 Conventional, as the vibration system of
the speaker, as shown in FIG. 1, a chair coil integrally formed with the diaphragm 1 has a bin 2
and a chair coil 3 wound around the lower end of the l bin 2, and the diameter of the bin 2 is the
outer diameter of the diaphragm 1 There are friends who have smaller diameters and smaller
ones. In general, it is known that the diaphragm of the speaker causes divided vibration when it
reaches the high frequency range of the reproduction band to cause peaks and valleys on the
sound pressure characteristic, causing high pl wave distortion to deteriorate the sound quality.
Even in the vibration system of a conventional speaker as shown in FIG. 1, the division vibration
of the diaphragm naturally occurs as described above, and in particular, when a material such as
metal foil is used for the diaphragm, internal loss is Because of the small size, the adverse effect
of the divided vibration becomes large as described above. l pin 2 and? The conventional
vibration system constituted by the chair coil 3 has a drawback that the adverse effect due to the
divided vibration in the high range becomes large. The present invention seeks to eliminate the
disadvantages of the prior art as described above, in which the vibration system is filled with a
loss body made of a material having a large internal loss, or at least the outer surface of the
vibration system. It is an object of the present invention to provide a speaker vibration system
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capable of suppressing divided vibration by sticking a loss body made of the above-mentioned
material on one side. Hereinafter, an embodiment of the present invention will be described with
reference to the drawings. FIG. 2 shows a vibration system of a loudspeaker according to a first
embodiment of the present invention. In FIG. 2, 1 is a dome-shaped diaphragm, 2 is a bobbin, 3 is
a discoil, and these have the same configuration as that of the conventional vibration system
shown in FIG. 1 and described above. Inside the diaphragm 1 and inside the upper portion of the
bobbin 2, a loss body 4 made of a lightweight material having a large internal loss as described
later is integrally filled. As the light-weight material having a large internal loss, a polymer
compound such as a urethane or a resin such as polystyrene, a metal foam, or a non-black
material may be used. Next, the effect of the provision of the loss body will be described with
reference to FIG. FIG. 3 shows the sound pressure frequency characteristics, in which the solid
line a shows the characteristics of the speaker using the vibration system having the loss body
according to the present invention, and the broken line shows the characteristics of the speaker
using the conventional vibration system. .
In the conventional vibration system shown in FIG. 1, as indicated by the broken line, the peaks
and valleys due to the divided vibration of the diaphragm appear in the high frequency range and
the characteristic is disturbed. In the vibration system shown in FIG. 2, as indicated by the solid
line a, the disturbance of the characteristics is suppressed in the high frequency range, and it is
clarified that the characteristics become excellent. 10 to FIG. FIG. 4 shows a second embodiment,
wherein the entire inner surface of the diaphragm 1 and? The loss body 4 is attached to the inner
surface of the upper end portion of the bottle 2. FIG. 5 shows the third embodiment, in which the
loss body 4 is attached to the upper part of the outer surface of the diaphragm 1. FIG. 6 shows
the fourth embodiment, and the loss body 4 and FIG. 5 Figure loss body 4 and crap ,, "; 109! +
FIG. 7 shows a fifth embodiment in which the loss bodies 4 and 4 are attached to the inner
surfaces of the diaphragm 1 and the I-bin 2 and the outer surface of the diaphragm 1 so as to be
joined together. The loss bodies 4 and 4 are attached to the upper portion of the outer surface of
the body 1 and the portion extending from the lower portion of the inner surface of the vibrator
1 to the lower portion of the inner surface of the bobbin 2. In the second to fifth embodiments,
the vibrator 1, the −bin 2 and the discoil 3 are the same as those of the first embodiment. FIG. 8
shows a sixth embodiment of the present invention, in which the shape of the diaphragm 1 is
cone-shaped, and the upper part of the diaphragm 1 and the satin 2 is filled with a loss body 4t.
FIG. 9 shows a seventh embodiment, in which a diaphragm 1. similar to the sixth embodiment is
used. FIG. 10 shows the eighth embodiment, in which the shape of the diaphragm l is shown in
FIG. In the sixth embodiment, the sixth embodiment to the eighth embodiment V are examples in
which the loss body 4 is filled in the inside of the diaphragm 1. In the sixth embodiment, the &
NN 22 and the coil 3 are the first embodiment. In the second to eighth embodiments of the
second embodiment to the eighth embodiment (... In the fifth embodiment, the material of the
loss body 4 is the same as that of the first embodiment. As shown in the second to eighth
embodiments described above, the present invention changes the mounting position, size, and
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shape of the loss body 4, and the shape of the diaphragm 1 is dome-shaped, cone-shaped, and
plane-shaped. Even if it changes to, the effect which can suppress the custom-made disorder
which is seen by the solid line a of FIG. 3 is obtained. As another effect of the loss body 4, any
structural reinforcement effect can be obtained together with the surface of the diaphragm of the
vibration system. Furthermore, in the present invention, the loss body may be filled or attached
only to at least one of the outer surface and the inner surface of the bobbin 2, and even in this
case, it is possible to suppress the divided vibration of the high range.
As described above, in the vibration system of the speaker according to the invention, the loss
body 4 made of a lightweight material having a large internal loss is fixed to at least one of the
diaphragm 1 and the bobbin 2 by means of adhesion As a result, the divided vibration generated
in the vibration system can be suppressed, and the adverse effect due to this can be reduced.
Therefore, there is an effect that it is possible to provide a speaker having a good% a.
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