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JPH0568297

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DESCRIPTION JPH0568297
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm in an electroacoustic transducer, and more particularly to a speaker
diaphragm resin-bonded to a single or mixture of high elasticity fibers consisting of inorganic
fibers or organic fibers. It relates to the manufacturing method.
[0002]
2. Description of the Related Art As is well known, a speaker diaphragm is required to have low
density (light weight) and high elasticity for improving the output sound pressure of the speaker
and expanding the reproduction frequency band, and the speaker vibration. In order to reduce
distortion due to plate division vibration, a large internal loss is required.
[0003]
Loudspeaker formed by bonding high elastic fiber group of high elastic fiber such as glass fiber
and carbon fiber alone or a mixture of different high elastic fibers as woven or non-woven fabric
by bonding resin in order to satisfy the above conditions In order to further lower the density
and increase the internal loss of a diaphragm or a diaphragm, a speaker diaphragm or the like is
proposed which is formed by uniformly dispersing micro hollow spheres in the bonding resin.
[0004]
Further, in a method of manufacturing such a speaker diaphragm, a bonding resin in which micro
hollow spheres are dispersed is impregnated by spraying or the like on the speaker diaphragm
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substrate made of the woven fabric or the like, and dried to prepare a prepreg sheet. According
to a method, the prepreg sheet is formed into a desired speaker diaphragm shape by heating and
pressing.
[0005]
SUMMARY OF THE INVENTION A conventional speaker diaphragm having such a structure uses
high elasticity fiber groups such as glass fibers and carbon fibers, so that high elasticity (high
Young's modulus) is obtained, and micro hollow spheres are obtained. Since it has a large
internal loss and a low apparent density, by uniformly dispersing it in a binding resin, an
appropriate internal loss can be obtained, and the density is not so large.
[0006]
However, in such a diaphragm, when the diaphragm having a relatively large aperture is used,
the outer peripheral portion of the diaphragm, that is, the portion near the edge, in particular
when reproducing the high region has a larger amplitude than the other portions of the
diaphragm. As it becomes larger, a divided vibration occurs and a large peak and dip occur on its
frequency characteristics.
Then, if the material whose Young's modulus is higher than that of the diaphragm is attached to
the outer peripheral portion of the diaphragm or the outer peripheral portion is made thicker
than the other portions in order to eliminate the peaks and dips, the weight of the diaphragm
increases. , There was a problem to be solved that the output sound pressure of the speaker is
lowered.
[0007]
Further, in the conventional speaker diaphragm manufacturing method, since the bonding resin
in which the micro hollow spheres are dispersed is impregnated into the speaker diaphragm base
material by spraying or the like, the micro hollow spheres can only be dispersed uniformly.
[0008]
Therefore, the present invention solves the drawbacks of the prior art, and is a speaker with high
elasticity, suitable internal loss, low density (light weight), and no mid-high peak and dip caused
by divided vibration. An object of the present invention is to provide a diaphragm and a method
of manufacturing the same.
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[0009]
In the speaker diaphragm according to the present invention for achieving the above object,
according to the first aspect of the present invention, a high elastic fiber woven fabric formed of
high elastic fibers consisting of inorganic fibers or organic fibers 1 and a binding resin 2
comprising a thermoplastic resin or thermosetting resin for binding the high elastic fiber woven
fabric 1 and at least two or more kinds of micro hollow spheres having different particle sizes
dispersed in the binding resin 2 And the micro hollow spheres 3 are dispersed in the bonding
resin 2 so that the particle size decreases and the particle amount increases in a direction from
the inner peripheral side to the outer peripheral side of the diaphragm. It is characterized by
[0010]
A second invention is characterized in that an elastic resin is enclosed in the micro hollow
spheres of the speaker diaphragm in the first invention.
[0011]
A third invention is characterized in that the elastic resin 7 is sealed only in the minute hollow
spheres dispersed in the inner peripheral side of the diaphragm in the speaker diaphragm in the
second invention.
[0012]
In a fourth invention, in the speaker diaphragm according to the first, second or third invention,
the dispersed shape of the micro hollow spheres 3 is a shape having an irregular distance from
the center of the speaker diaphragm. Do.
[0013]
In a fifth invention, in the speaker diaphragm according to the first, second, third or fourth
invention, the dispersed shape of the micro hollow sphere 3 is non-similar to the shape of the
speaker diaphragm. Do.
[0014]
Here, the dispersion shape of the micro hollow spheres 3 refers to a shape representing the
distribution of the micro hollow spheres 3 dispersed according to the particle diameter of the
micro hollow spheres 3.
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[0015]
The method for manufacturing a speaker diaphragm according to the first, second, third, fourth
or fifth invention, the high elastic fiber woven fabric 1 is disposed on the concave mold 5 and the
cross section is a circle, an ellipse, At least one type of tubular mold 9 having a polygonal shape
or a combination thereof is pressed onto the highly elastic fiber woven fabric 1 and micro hollow
spheres 3 having different particle sizes are dispersed according to the particle size. The bonding
resin 2 is allowed to flow onto the high elastic fiber 1 from each space formed by the tubular
mold 6. When the flowing bonding resin 2 reaches a predetermined viscosity, the tubular mold 6
is A prepreg sheet is formed by removal, and the prepreg sheet is heat and pressure molded into
a desired speaker diaphragm shape.
[0016]
In the speaker diaphragm as described above, since high elasticity woven fabric such as glass
fiber and carbon fiber is used, the elasticity becomes large, and the hollow hollow sphere having
a large internal loss and a small apparent density is obtained. The particle diameter of the
bonding resin is reduced from the inner periphery to the outer periphery of the diaphragm and
dispersed so as to increase the amount of particles, so the speaker diaphragm is reduced in
weight (lowered in density) and further vibrated. The rigidity of the outer peripheral portion of
the plate is higher than that of the inner peripheral portion, and the apparent internal loss of the
speaker diaphragm is improved.
[0017]
In the hollow hollow spheres in which the elastic resin is sealed, the internal loss is further
improved.
[0018]
In the one in which the elastic resin is enclosed only in the minute hollow spheres dispersed on
the inner peripheral side of the diaphragm, the rigidity is higher on the outer peripheral side of
the speaker diaphragm (compared to the inner peripheral side), On the inner circumference side
(compared to the outer circumference side), the internal loss is larger.
[0019]
In the case where the dispersion shape of the micro hollow spheres (3) has an irregular distance
from the center of the speaker diaphragm or is non-similar to the shape of the speaker
diaphragm, the resonance frequency of the speaker diaphragm is dispersed Be done.
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[0020]
Further, in the manufacturing method according to the present application, the minute hollow
spheres are dispersed so that the particle amount and the particle diameter are different from the
inner peripheral side to the outer peripheral side of the speaker diaphragm.
[0021]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The preferred embodiment of the
present invention will be described in detail with reference to FIGS.
1 and 2 are cross-sectional views of the speaker diaphragm in the embodiment of the present
invention, and FIGS. 3 and 4 are cross-sectional views of a method of manufacturing the speaker
diaphragm in the embodiment of the present invention.
In FIGS. 1 to 4, 1 is a high elastic fiber woven fabric, 1 'is a carbon fiber woven fabric, 2 and 2a,
2b and 2c are thermosetting resins or bonding resins comprising thermosetting resins, and 2' is
an epoxy resin. , 3S, 3M, 3L are micro hollow spheres, 4 is an edge, 5 is a concave mold, 6 and
6a, 6b are tubular molds, and 7 is an elastic resin.
[0022]
As shown in FIG. 1, in the speaker diaphragm according to the first embodiment of the present
invention, a carbon fiber woven fabric 1 ′ obtained by plain-weaving a 3000 filament carbon
fiber bundle at a fiber bundle density of 12.5 / inch is bonded by an epoxy resin 2 ′. In the
epoxy resin 2 ′, the diaphragm is provided between the outer periphery of the diaphragm, ie,
near the edge 4 and the inner periphery of the diaphragm, ie, near the voice coil, and between
the outer periphery and the inner periphery of the diaphragm. The middle part is composed of a
vinylidene chloride copolymer having a particle size of 30 μm, an apparent density of 0.035 g /
cm 3, a particle size of 50 μm, an apparent density of 0.015 g / cm 3, and a particle size of 40
μm and an apparent density of 0.025 g / cm 3. Micro hollow spheres 3S, 3L, 3M are dispersed
at a weight ratio of 3%, 2%, 3% to epoxy resin 2 ′, respectively.
Here, since the weight of the particles themselves is smaller when the particle diameter of the
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micro hollow spheres 3 is smaller, the amount of particles is larger than that of the particles
having the same weight ratio.
[0023]
In the speaker diaphragm according to the second embodiment of the present invention,
polypropylene is sealed as an elastic resin 7 in the micro hollow spheres 3 composed of the
vinylidene chloride copolymer of the diaphragm of the first embodiment. The apparent densities
of the micro hollow spheres 3S, 3L and 3M in the peripheral part and the intermediate part are
0.730 g / cm 3, 0.760 g / cm 3 and 0.745 g / cm 3 respectively, and they are dispersed in the
same manner as Example 1 ( Not shown).
[0024]
In the speaker diaphragm according to the third embodiment of the present invention, as shown
in FIG. 2, the micro hollows dispersed in the inner peripheral portion of the speaker diaphragm
of the hollow microspheres 3 made of the vinylidene chloride copolymer in the first embodiment.
Polypropylene which is an elastic resin 7 is enclosed only in the sphere 3L, and the apparent
density of the micro hollow spheres 3S, 3L and 3M in the outer peripheral part, the inner
peripheral part and the middle part of the speaker diaphragm is 0.035 g / cm3 and 0.760 g / 30,
respectively. It has a cm3 of 0.025 g / cm3 and is dispersed in the same manner as in Example 1
above.
[0025]
Next, an embodiment of a method of manufacturing a speaker diaphragm in Embodiments 1, 2
and 3 of the present invention will be described in detail.
[0026]
As shown in FIG. 3, first, the carbon fiber woven fabric 1 'of Example 1, 2 or 3 is placed on the
concave mold 5 and the cross-sectional shape is elliptical and the cross-sectional area is about 1
of the concave mold 5 respectively. The tubular molds 6a and 6b each having a relatively thin
tube portion having a thickness of / 9, 4/9 are different from each other in the oval direction and
the centers of the tubular molds 6a and 6b are the centers of the concave molds 5 And the
carbon fiber woven fabric 1 '.
Thus, the spaces a, b, c, which have irregular distances from the center of the speaker diaphragm
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on the carbon fiber woven fabric 1 ′ and form a dispersed shape of the micro hollow sphere 3
which is non-similar to the speaker diaphragm. Is formed.
[0027]
Next, the tubular mold 6 is pressurized from above at a low pressure, and the hollow spheres 3S,
3M, 3L of the embodiments 1, 2 or 3 having particle sizes of 30 μm, 40 μm, 50 μm are epoxy
resin 2 according to their particle sizes. And the binding resin 2c in which micro hollow spheres
3L having a particle diameter of 50 .mu.m are dispersed out of the respective binding resins 2
obtained by dispersing them in the resin using a dispersant and a kneader. The binding resin 2b
in which a specific amount of carbon fiber woven fabric 1 'flows from the inner space c of the
carbon fiber 1 and micro hollow spheres 3M having a particle diameter of 40 μm are dispersed
is the outside of the tubular mold 6a and the tubular mold 6b A binding resin 3c which flows in a
specific amount from the space b inside the carbon fiber woven fabric 1 'and in which micro
hollow spheres 3S having a particle diameter of 30 μm are dispersed is the outside of the
tubular mold 6b and a concave mold A specific amount flows from the space a which is the inside
of 5 onto the woven carbon fiber 1 ′.
Here, a viscosity modifier is added to the binding resin 2 and when the viscosity of the binding
resin 2 reaches a predetermined viscosity, it flows as described above.
Therefore, as shown in FIG. 2, the bonding resin 2 hardly flows on the bottom side of the concave
mold 5 of the carbon fiber woven fabric 1 ′ to such an extent that the epoxy resin 2 ′ itself is
impregnated into the carbon fiber woven fabric 1 ′. .
Then, when the viscosity of the binding resin 2 is further increased and the flow of the micro
hollow spheres 3 in the binding resin 2 is almost lost, the tubular mold 6 is removed.
Thereafter, when the respective bonding resins 2a, 2b and 2c are bonded to each other, the sheet
of the carbon fiber woven fabric 1 ′ configured as described above is turned upside down, and
the same steps as described above are performed as shown in FIG. To obtain a prepreg sheet.
The speaker diaphragm of the first, second, or third embodiment is obtained by heat-pressure
molding the prepreg sheet into a cone shape.
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[0028]
Next, as modified example 1 of embodiment 1, 2 or 3 of the speaker diaphragm according to the
present invention, the speaker diaphragm according to the present invention is a hollow hollow
sphere 3 in the bonding resin 2 of only one side of the carbon fiber woven fabric 1 ′. In the case
of being dispersed, the method of manufacturing makes the viscosity of the binding resin 2
flowed onto the carbon fiber woven fabric 1 ′ in the example of the production method lower
than that of the above example, and the epoxy resin in the binding resin 2 It is obtained by
impregnating only 2 ′ to the concave mold 5 side of the carbon fiber woven fabric 1 ′.
[0029]
In addition, as a modification 2 of the embodiment 1, 2 or 3 of the speaker diaphragm according
to the present invention, the method of manufacturing the diaphragm is formed using a relatively
textured high elastic fiber woven fabric 1. Since the micro hollow spheres 3 are smaller than the
size of the weave of the high elastic fiber woven fabric 1, as shown in the embodiment of the
manufacturing method described above, only by flowing the binding resin 2 onto one side of the
high elastic fiber woven fabric 1. It is possible to obtain a diaphragm in which micro hollow
spheres 3 such as 3 are dispersed on both sides of the high elastic fiber woven fabric 1.
[0030]
Although the speaker diaphragm according to the present invention and the method for
manufacturing the same have been described in detail based on the example considered to be
representative, the embodiments of the speaker diaphragm according to the present invention
and the method for manufacturing the same are, for example, high elastic fibers, The material of
thermosetting resin or thermoplastic resin, micro hollow sphere, elastic resin is not limited to
carbon fiber, epoxy resin, vinylidene chloride copolymer, polypropylene respectively, and high
elastic fiber woven fabric is one kind of high It is not necessary to make a woven fabric by elastic
fibers, and it may be a woven fabric by mixing different high elastic fibers, and even in the
dispersion shape of micro hollow spheres, for example, a circle or polygon eccentric to the
speaker diaphragm. It is not necessary to use a shape other than an ellipse such as, for example,
three types of micro hollow spheres, for example micro hollow spheres having a large particle
size and micro hollow spheres having a small particle size. It is possible to use a mixture of two
or more types of micro hollow spheres singly or in combination, such as dispersing a mixture of
micro hollow spheres having different particle sizes in the inner peripheral part, outer peripheral
part and middle part of the speaker diaphragm. The shape of the dispersion may be different
between the front and back of the speaker diaphragm, and the speaker diaphragm in the present
invention may be laminated. The invention is not limited to the structure of the above
embodiment, and the above-mentioned patent The invention can be appropriately modified and
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implemented as long as it has the configuration requirements described in the claims, exhibits
the action according to the present invention, and has the effects described below.
[0031]
The speaker obtained by bonding the inner and outer peripheral portions of each of Examples 1,
2 and 3 of the speaker diaphragm according to the present invention and a carbon fiber woven
fabric by an epoxy resin as a conventional example for comparison. The characteristics of
density, Young's modulus E, and internal loss (tan δ) measured by the vibration reed method
with the diaphragm are shown in Table 1.
[0032]
Next, the frequency characteristics of each of the speakers completed using the speaker
diaphragms of the third embodiment and the conventional example are shown in FIG.
[0033]
As apparent from Table 1, the speaker diaphragm according to the present invention has a lower
density as the whole speaker diaphragm, improves the internal loss (tan δ), and is more sealed
in the elastic material as compared with the conventional example. The internal loss increases
and the acoustic characteristics improve.
[0034]
Furthermore, as apparent from FIG. 5, since the outer peripheral portion of the speaker
diaphragm is more elastic than the inner peripheral portion, it is difficult to be affected by edge
resonance (such as dip in the middle range), and the inside of the speaker diaphragm At the
periphery, the internal loss (tan δ) is larger than that at the outer periphery, so that the
resonance of the speaker diaphragm in the high region is absorbed, and the dispersion shape of
the micro hollow spheres has an irregular distance from the center of the speaker diaphragm. If
the speaker diaphragm is not similar to that of the speaker diaphragm, the resonance in the high
frequency band is dispersed, and the peak and the dip are reduced. This makes the speaker
diaphragm extremely excellent in acoustic characteristics.
[0035]
In addition, using the manufacturing method according to the present application, micro hollow
spheres of a desired particle size can be easily dispersed in a desired particle amount and a
desired dispersion shape, and a loudspeaker diaphragm having desired physical properties can
be obtained. Is possible.
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