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JPH06225389

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DESCRIPTION JPH06225389
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker, and more particularly to a speaker edge related to the diaphragm.
[0002]
2. Description of the Related Art Generally, as shown in FIG. 5, a speaker edge is provided
between a diaphragm 9 for emitting sound and a frame 7, and a conventional speaker edge is, for
example, woven. There are those in which a cloth or non-woven fabric is impregnated with a
thermosetting resin such as a phenol resin and dried, and then molded into a desired shape by
heat pressure molding.
[0003]
By the way, usually, the edge for a speaker has a desired shape, has a flexibility not to hinder the
amplitude movement of the diaphragm, has an appropriate vibration damping property, etc. It is
required to meet the requirements of
[0004]
However, in the case of an edge molded using a thermosetting resin such as a phenol resin as
described above, a desired shape can be obtained by heat pressure molding, and the edge is
maintained in a desired shape by curing the resin. However, since the entire edge is hardened,
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sufficient flexibility of the edge can not be obtained, and therefore, sufficient vibration damping
property to the vibration from the diaphragm can not be obtained.
As a result, natural resonance occurs at the edge, making it difficult to obtain a flat sound
pressure frequency characteristic, and there is a problem in that the sound quality is poor in
terms of hearing.
[0005]
It is an object of the present invention to provide a speaker edge having flexibility and excellent
vibration damping that does not impede the amplitude movement of the diaphragm.
[0006]
SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving
the above-mentioned problems, and the edge for a speaker according to claim 1 is formed by a
resin impregnated cloth which holds the diaphragm of the speaker at the center. In the speaker
edge, an acrylic fiber woven fabric made of a polymer mainly composed of acrylonitrile is used as
the above-mentioned cloth.
[0007]
The speaker edge according to claim 2 is a speaker edge formed of a resin-impregnated cloth
that holds the diaphragm of the speaker at the center, the cloth comprising an acrylic fiber made
of a polymer containing acrylonitrile as a main component, and the like. It uses a woven fabric by
mixed spinning with fibers.
[0008]
The speaker edge according to claim 3 is a speaker edge formed of a resin-impregnated cloth
that holds the diaphragm of the speaker at its center, and the acrylic cloth made of an acrylic
nitrile-based polymer and the like on the cloth. The cross-woven fabric with the fiber yarn of
[0009]
A speaker edge according to a fourth aspect of the present invention is one in which an aromatic
polyamide fiber is used for the other fiber.
[0010]
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A speaker edge according to a fifth aspect of the present invention is one in which cotton fibers
are used for the other fibers.
[0011]
Therefore, by using a woven fabric of acrylic fibers having a high vibration damping property for
the resin-impregnated cloth forming the edge, it is possible to obtain sufficient flexibility at the
edge and also obtain excellent vibration damping properties. it can.
[0012]
Also, a resin-impregnated fabric forming the edge is a woven fabric by mixing fiber of acrylic
fiber with high vibration damping property and aromatic polyamide fiber excellent in heat
resistance, flexibility and strength, or acrylic fiber yarn and aromatic polyamide By using a crosswoven fabric of fiber yarns, it is possible to obtain sufficient flexibility at the edge and obtain
excellent vibration damping properties, and also have physical properties of aromatic polyamide
excellent in heat resistance, flexibility and strength It becomes.
[0013]
Also, by using, as resin-impregnated cloth forming an edge, a woven fabric of mixed yarn of
cotton fibers excellent in affinity with acrylic fibers having high vibration damping properties, or
a cross woven fabric of acrylic fiber yarns and cotton fiber yarns. In addition to sufficient
flexibility at the edge, excellent vibration damping property can be obtained, and the cotton has
physical properties of excellent affinity.
[0014]
DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] The following description
will explain an embodiment of the present invention, while referring to FIGS. 1, 2 and 5. FIG.
[0015]
As shown in FIG. 5, the loudspeaker according to the present embodiment comprises a magnetic
circuit unit 1 and a vibrating unit 2. Among them, the magnetic circuit unit 1 is disposed at the
center of the circular flat plate 3a and the flat plate 3a. A support plate 3 comprising a cylindrical
center pole 3b provided, an annular magnet 4 concentrically fixed to the center pole 3b on the
side of the center pole 3b of the flat plate portion 3a, and a magnet 4 on the upper end face of
the magnet 4 And an annular top plate 6 provided concentrically.
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The air gap formed between the magnet 4 and the upper plate 6 and the center pole 3b is used
as a magnetic gap to guide the magnetic flux from the magnet 4 to a voice coil 5 described later.
[0016]
The vibrating portion 2 has a conical (conical) vibration plate 9, and a voice coil bobbin 5 a of the
voice coil 5 as a vibration source is adhered to a central hole portion corresponding to a cone top
portion of the vibration plate 9. It is fixed by etc.
A flexible annular damper 11 is fixed to the voice coil 5 and the diaphragm 9 by bonding or the
like, and the outer peripheral portion of the damper 11 is conically fixed to the upper end surface
of the upper plate 6. The frame 7 is elastically supported by adhesion or the like.
On the other hand, an edge 8 is adhered to the outer periphery of the cone bottom of the
diaphragm 9, and the edge 8 is fixed to the edge support 7a of the frame 7 by adhesion or the
like.
That is, the frame 7 also supports the diaphragm 9 via the edge 8.
Further, on the voice coil 5 side of the diaphragm 9, a dust cap 10 for preventing dust is
provided.
[0017]
Further, the edge 8 described above is impregnated with a woven fabric of yarn equivalent to #
40 (40th count) obtained by spinning an acrylic fiber of 1.5 denier through fiber, and is dried by
air after being impregnated with a phenolic resin solution. It is molded as shown in FIG. 1 using a
mold.
By the way, an acrylic fiber made of a polymer containing acrylonitrile as a main component has
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a large vibration damping property, and therefore has excellent vibration damping property.
[0018]
Then, the frequency characteristic of the transoral 10 cm speaker using the edge 8 is shown in
FIG.
FIG. 6 shows the frequency characteristics of the comparative example with the edge formed into
the same shape as the present embodiment using cotton fiber.
[0019]
Here, it can be seen that in the frequency characteristics shown in FIG. 5, a peak due to edge
resonance and a dip due to reverse resonance occur at around 2000 Hz.
On the other hand, in the frequency characteristic of the speaker using the edge according to the
embodiment, such a peak and a dip are not recognized.
That is, since the edge 8 using acrylic fiber has large vibration damping property and excellent
vibration damping property, flat sound pressure frequency characteristics can be obtained.
Therefore, the resonance of the diaphragm 9 and the edge 8 is eliminated, and the occurrence of
a significant peak or dip in the frequency characteristic of the speaker can be suppressed.
[0020]
Therefore, the speaker using the edge 8 using acrylic fiber as described above has excellent
acoustic characteristics with good frequency characteristics.
[0021]
In addition, although it shape ¦ molded using the acrylic fiber of 1.5 denier in a present Example,
if the said effect is acquired, it will not limit to this.
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[0022]
[Embodiment 2] The following will describe another embodiment of the present invention in
reference to FIG. 1, FIG. 3 and FIG.
The components of the loudspeaker according to the present embodiment are the same as those
of the first embodiment, and thus the description thereof is omitted.
[0023]
Edge 8 is a mixed yarn of # 40 equivalent mixed fiber obtained by blending and spinning acrylic
fiber of 1.5 denier with fiber and aromatic polyamide fiber at a blending ratio of 50%,
impregnated into a phenol resin solution, and blown by blowing After drying, it is molded as
shown in FIG. 1 using a mold.
[0024]
By the way, an acrylic fiber made of a polymer containing acrylonitrile as a main component has
a large vibration damping property, and thus has an excellent vibration damping property, and is
an aromatic polyamide fiber blended at a blending ratio of 50%. Excellent heat resistance,
flexibility and strength.
[0025]
Then, the frequency characteristic of the transoral 10 cm speaker using the edge 8 is shown in
FIG.
FIG. 6 shows the frequency characteristics of the comparative example with the edge formed into
the same shape as the present embodiment using cotton fiber.
[0026]
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Here, it can be seen that in the frequency characteristic shown in FIG. 6, a peak due to edge
resonance and a dip due to reverse resonance occur at around 2000 Hz.
On the other hand, in the frequency characteristic of the speaker using the edge according to the
embodiment, such a peak and a dip are not recognized.
That is, since the edge 8 using the woven fabric of mixed yarn of acrylic fiber and aromatic
polyamide fiber has large vibration damping property and excellent vibration damping property,
flat sound pressure frequency characteristics can be obtained. , Heat resistance, flexibility, and
strength.
As a result, the resonance of the diaphragm 9 and the edge 8 is eliminated, and the occurrence of
a significant peak or dip in the frequency characteristic of the speaker can be suppressed, and
the intensity is strong.
[0027]
Therefore, as described above, the speaker using the edge 8 using the woven fabric of the acrylic
fiber and the aromatic polyamide fiber by co-spinning has excellent acoustic characteristics with
good frequency characteristics and excellent strength.
[0028]
In this example, a woven fabric made of mixed spinning with a blend ratio of acrylic fiber and
aromatic polyamide fiber of 1.5 denier of fiber set to 50% was used, but the present invention is
limited as long as the above effect can be obtained. do not do.
[0029]
Third Embodiment Still another embodiment of the present invention will be described below
with reference to FIGS. 1 and 4 to 5. FIG.
The components of the loudspeaker according to the present embodiment are the same as those
of the first embodiment, and thus the description thereof is omitted.
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[0030]
Edge 8 is a cross-woven fabric made by alternately using yarns such as # 40 and # 40 equivalent
cotton fibers obtained by spinning acrylic fibers of 1.5 denier per fiber After being impregnated
with a resin solution and dried by air blowing, it is molded as shown in FIG. 1 using a mold.
[0031]
By the way, an acrylic fiber made of a polymer containing acrylonitrile as a main component has
a large vibration damping property, so it has an excellent vibration damping property, and a
cross-woven cotton fiber is excellent in affinity.
[0032]
Then, the frequency characteristic of the transoral 10 cm speaker using the edge 8 is shown in
FIG.
FIG. 6 shows the frequency characteristics of the comparative example with the edge formed into
the same shape as the present embodiment using cotton fiber.
[0033]
Here, it can be seen that in the frequency characteristic shown in FIG. 6, a peak due to edge
resonance and a dip due to reverse resonance occur at around 2000 Hz.
On the other hand, in the frequency characteristic of the speaker using the edge according to the
embodiment, such a peak and a dip are not recognized.
That is, since the edge 8 using the cross woven fabric made of acrylic fiber yarn and cotton fiber
yarn has high vibration damping property and excellent vibration damping property, it is
possible to obtain flat sound pressure frequency characteristics and It will be excellent in sex.
Therefore, the resonance of the diaphragm 9 and the edge 8 is eliminated, and the occurrence of
a significant peak or dip in the frequency characteristic of the speaker can be suppressed.
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[0034]
Therefore, a speaker using the edge 8 using the cross woven fabric made of acrylic fiber yarn
and cotton fiber yarn as described above has excellent acoustic characteristics with good
frequency characteristics.
[0035]
In the present embodiment, a cross woven fabric made of 1.5 denier acrylic fiber yarn and cotton
fiber yarn is used, but the present invention is not limited to this as long as the above effect can
be obtained.
Further, internal losses of the edges of the above-described Examples 1, 2, 3 and Comparative
Example are shown in Table 1.
[0037]
When the internal losses of the edges are compared according to Table 1 above, the edge molded
by the resin-impregnated cloth using the acrylic fibers of Examples 1, 2 and 3 is clearly superior.
[0038]
As described above, according to the present invention, by forming an edge with a resinimpregnated cloth using acrylic fiber, the edge has a high vibration damping property and an
excellent vibration damping property. There is no occurrence of a peak due to resonance and a
dip due to reverse resonance, so that the speaker can obtain flat sound pressure frequency
characteristics.
[0039]
In addition, by shaping the edge using a woven fabric of mixed yarn of acrylic fiber and aromatic
polyamide fiber or a cross woven fabric of acrylic fiber yarn and aromatic polyamide fiber yarn,
the vibration damping property is large and the vibration damping property is excellent. And the
edge is excellent in heat resistance, flexibility, and strength, so that peaks due to edge resonance
and dips due to reverse resonance do not occur, so that the speaker obtains flat sound pressure
frequency characteristics. Can.
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[0040]
Also, by shaping the edge using a woven fabric of mixed yarn of acrylic fiber and cotton fiber or a
cross woven fabric of acrylic fiber yarn and cotton fiber yarn, the vibration damping property is
large and has excellent vibration damping property, And since the edge has excellent affinity,
there is no occurrence of a peak due to edge resonance and a dip due to reverse resonance, so
that the speaker can obtain a flat sound pressure frequency characteristic.
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