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JP2015192416

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DESCRIPTION JP2015192416
A diaphragm for a speaker device which has a high Young's modulus, a large internal loss and a
long life and a method of manufacturing the diaphragm for a speaker device. A first binder is
provided straddling a first layer L1 and a second layer L2, and a second binder straddles a third
layer L3 and a second layer L2. The second layer L2 can be securely fixed, and the second layer
L2 and the third layer L3 can be securely fixed. Furthermore, by increasing the Young's modulus
of the first layer L1 and the third layer L3, the internal loss can be increased by using an
appropriate second fiber in the second layer L2, and the Young of the entire diaphragm 1 for a
speaker device can be increased. The internal loss can be increased as the rate is increased.
[Selected figure] Figure 1
Loudspeaker device diaphragm, and manufacturing method of speaker device diaphragm
[0001]
The present invention relates to a speaker device diaphragm and a method of manufacturing the
speaker device diaphragm.
[0002]
Generally, a diaphragm for a speaker device is required to have a high Young's modulus and a
large internal loss, but it is difficult to satisfy these characteristics with one material.
Therefore, a diaphragm for a speaker device having a multilayer structure using different
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1
materials has been proposed (see, for example, Patent Document 1). In the conventional
diaphragm for a speaker device described in Patent Document 1, the Young of the entire
diaphragm is configured by configuring one layer with a material having a high Young's modulus
and configuring another layer with a material having a large internal loss. As the rate increases,
internal losses increase.
[0003]
Japanese Patent Application Laid-Open No. 7-184295
[0004]
However, in the conventional diaphragm for a speaker device described in Patent Document 1,
although it is necessary to bond the layers with an adhesive or the like, there is a possibility that
the layers may be peeled off due to aging, and there is a disadvantage that the life is short. The
Furthermore, when the difference in Young's modulus of each layer becomes large, it tries to
vibrate with mutually different amplitudes, and peeling becomes more likely to occur.
[0005]
Accordingly, an object of the present invention is to provide a diaphragm for a speaker device
which has a high Young's modulus and a large internal loss and can have a long life, and to
provide a method of manufacturing the diaphragm for a speaker device.
[0006]
In order to solve the problems described above and to achieve the object, the diaphragm for a
speaker device of the present invention according to claim 1 is a first entangled body in which a
first fiber and a first binder are intertwined with each other, and (1) A first layer configured with
a first filler dispersed in a entangled body, a second layer configured with a second entangled
body in which a second fiber is entangled, a third fiber, and a third A third entanglement body in
which two binders are intertwined with each other, and a third layer composed of a second filler
dispersed in the third entangled body are characterized in that they are sequentially stacked. .
[0007]
On the other hand, the method of manufacturing a diaphragm for a speaker device of the present
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2
invention according to claim 15 is a manufacturing method for manufacturing the diaphragm for
a speaker device, and it is dispersed in the first entangled body and the first entangled body. The
mixture containing the first filler, the second entangled body, and the mixture containing the
third entangled body and the second filler dispersed in the third entangled body are sequentially
stacked, and a pair of molds It is characterized in that it is sandwiched and heated and
pressurized from the thickness direction.
[0008]
It is a sectional view showing the diaphragm for speaker devices concerning the example of the
embodiment of the present invention.
It is sectional drawing which shows the procedure which manufactures the said diaphragm for
speaker apparatuses.
[0009]
Hereinafter, embodiments of the present invention will be described.
A diaphragm for a speaker device according to an embodiment of the present invention includes
a first interlacing body in which a first fiber and a first binder are intertwined with each other,
and a first filler dispersed in the first interlacing body. A third layer in which the first layer
configured, the second layer including the second entangled body in which the second fibers are
intertwined, the third entangled body in which the third fiber and the second binder are
intertwined with each other, A third layer configured to have a second filler dispersed in a third
entangled body is characterized in that the layers are sequentially stacked.
[0010]
When the first layer includes the first binder, the first binder can be entangled with the second
fibers of the second layer, and the first layer and the second layer can be reliably fixed.
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In addition, when the third layer includes the second binder, the second binder can be entangled
with the second fibers of the second layer, and the third layer and the second layer can be
reliably fixed. As described above, in the configuration in which the binder and the fibers are
intertwined to fix the layers to each other, peeling is less likely to occur due to deterioration over
time, and the life can be extended, as compared with the configuration using the adhesive.
[0011]
Furthermore, the Young's modulus can be increased by the first layer and the third layer having
a filler, and the internal loss can be increased by using an appropriate second fiber in the second
layer, and the diaphragm The internal loss can be increased while the overall Young's modulus is
increased. In addition, by forming the first layer and the third layer with high Young's modulus
on both sides of the diaphragm, compared to the two-layer structure in which the layer with high
Young's modulus is formed on one side, The Young's modulus can be increased, and fibers with
higher internal loss can be used in the second layer sandwiched therebetween.
[0012]
The second layer includes a first permeation layer in which the first binder penetrates from the
first layer, a second permeation layer in which the second binder permeates from the third layer,
and the first permeation layer. It is preferable that an intermediate layer with the second
permeation layer is formed. Thus, the first permeation layer can securely fix the first layer and
the second layer, and the second permeation layer can secure the third layer and the second
layer.
[0013]
The sum of the thicknesses of the first permeation layer and the second permeation layer is
preferably 3% or more and 20% or less of the thickness of the second layer. Thus, the layers can
be securely fixed to each other, and the internal loss of the second layer can be secured. On the
other hand, if the permeation layer is too thin, the force to fix the layers will be weak, and if the
permeation layer is too thick, the binder will increase the Young's modulus of the permeation
layer and the internal loss of the second layer will decrease. .
10-05-2019
4
[0014]
More preferably, the sum of the thicknesses of the first permeation layer and the second
permeation layer is 10% or less of the thickness of the second layer. Thereby, the internal loss of
the second layer can be secured.
[0015]
The Young's modulus of the first permeation layer and the second permeation layer is preferably
higher than the Young's modulus of the intermediate layer. Thereby, the permeation layer has a
Young's modulus between the intermediate layer and the first or third layer, and can function as
a buffer. That is, even when the difference in Young's modulus is large between the intermediate
layer and the first layer and the third layer, the difference in amplitude can be absorbed by the
permeation layer.
[0016]
The Young's modulus of the second layer is preferably lower than the Young's modulus of the
first layer and the third layer. Thereby, the internal loss of the second layer can be increased.
[0017]
The internal loss of the first permeation layer and the second permeation layer is preferably
smaller than the internal loss of the intermediate layer. Thereby, the Young's modulus of the
permeation layer can be increased to function as a buffer.
[0018]
The internal loss of the second layer is preferably larger than the internal loss of the first layer
and the third layer. Thereby, the Young's modulus of the first and third layers can be increased
and the internal loss of the second layer can be increased.
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5
[0019]
The second layer is preferably formed thicker than the first layer and the third layer. Thereby,
the internal loss of the second layer can be made sufficiently large.
[0020]
It is preferable that the first fiber and the third fiber contain a common fiber. Thereby, the
members can be made common and the cost can be reduced.
[0021]
It is preferable that the first fiber, the second fiber, and the third fiber include a common fiber.
Thereby, the members can be made common and the cost can be reduced.
[0022]
It is preferable that the first binder and the second binder include a common binder. Thereby, the
members can be made common and the cost can be reduced. Furthermore, for example, when the
first binder and the second binder are entangled with the second fiber by heating, they can be
entangled by the same degree at substantially the same temperature, and the fixing force
between the layers can be easily adjusted.
[0023]
It is preferable that the first filler and the second filler contain a common filler. Thereby, the
members can be made common and the cost can be reduced. Furthermore, if the thicknesses of
the first layer and the third layer are made approximately the same, the Young's modulus can be
made substantially the same, and the difference in amplitude between the first layer and the third
layer can be reduced. Can be vibrated integrally, and peeling of layers can be prevented more
reliably.
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[0024]
It is preferable that the first layer, the second layer, and the third layer, which are sequentially
stacked, be sandwiched between a pair of molds in the thickness direction and be formed by
being heated and pressed. Thereby, each binder can be melted and permeated into the second
layer to be entangled with the second fiber.
[0025]
A method of manufacturing a diaphragm for a speaker device according to an embodiment of the
present invention is a manufacturing method of manufacturing the diaphragm for a speaker
device, wherein the first entangled body and the first dispersed in the first entangled body are
provided. A mixture containing a filler, the second entangled body, and a mixture containing the
third entangled body and a second filler dispersed in the third entangled body are sequentially
stacked, and from a thickness direction by a pair of molds It is characterized by sandwiching and
heating and pressurizing. Thereby, each binder can be melted and permeated into the second
layer to be entangled with the second fiber.
[0026]
Examples of the present invention will be specifically described below. FIG. 1 is a cross-sectional
view showing a diaphragm 1 for a speaker device according to an embodiment of the present
invention.
[0027]
The entire speaker device diaphragm 1 is formed in a cone shape and configured to be able to
vibrate in the vertical direction in FIG. 1, and as shown in an enlarged manner in FIG. 1B, the first
layer L1 and the second layer L2 And the third layer L3 are sequentially stacked from the upper
side. Further, the upper side of the speaker device diaphragm 1 is the front side and the lower
side is the rear side in FIG. 1, and an enclosure is provided on the rear side, for example.
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[0028]
The first layer L1 is configured to include a first interlacing body 2 in which a first fiber (not
shown) and a first binder (not shown) are intertwined with each other, and a first filler 20
dispersed in the first interlacing body 2 It is done.
[0029]
The second layer L2 is configured to have a second entangled body 3 in which second fibers (not
shown) are intertwined.
Further, in the second layer L2, a first permeation layer L21 in which the first binder penetrates
from the first layer L1, a second permeation layer L23 in which a second binder later described
from the third layer L3 permeates, and a first permeation An intermediate layer L22 between the
layer L21 and the second permeation layer L23 is formed.
[0030]
In the first permeation layer L21, the first binder is intertwined with the second fiber, and in the
second permeation layer L22, the second binder is intertwined with the second fiber. That is, the
first binder is provided across the first layer L1 and the second layer L2, and the second binder is
across the third layer L3 and the second layer L2.
[0031]
The third layer L3 is configured to include a third interlacing body 4 in which a third fiber not
shown and a second binder not shown are intertwined with each other, and a second filler 40
dispersed in the third intermingled body 4 It is done.
[0032]
The first to third fibers are wood pulp fibers such as sulfite pulp and kraft pulp, non-wood pulp
fibers such as bamboo and straw, chemical fibers composed of rayon, nylon, vinylon, polyester,
acrylic or the like (synthetic fibers ), Animal fibers such as silk and wool, plant fibers such as
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manila hemp and cotton, organic fibers composed of graphite etc., inorganic fibers composed of
silicon carbide etc. (glass fibers, carbon fibers, ceramic fibers), basalt etc. Mineral fiber etc. which
are comprised by these are illustrated.
The first to third fibers may be identical or different from each other.
[0033]
The first binder and the second binder may be any one that can be melted by heating and can be
entangled with the second fiber while being dispersed in a solvent for forming the first fiber and
the third fiber, together with the first binder The second binder may be identical to or different
from each other. As a binder, the polyvinyl-alcohol-type fiber which has boron is illustrated, for
example. The polyvinyl alcohol fiber having boron may be, for example, a polyvinyl alcohol resin
having boric acid or a polyvinyl alcohol resin having boron crosslink.
[0034]
The polyvinyl alcohol resin having a boron crosslink is, for example, one in which a crosslink
structure with boron is formed by adding boric acid, borate, boronic acid and the like to polyvinyl
alcohol. The polyvinyl alcohol here is a polymer containing 10 mol% or more, preferably 30
mol% or more, more preferably 50 mol% or more of vinyl alcohol units, and usually a
homopolymer or copolymer of vinyl ester or vinyl ether Are obtained by hydrolysis
(saponification, alcoholysis, etc.). Here, as a vinyl ester, vinyl acetate is mentioned as a
representative example, and vinyl formate, vinyl propionate, vinyl pivalate, vinyl valerate, vinyl
caprate, vinyl benzoate and the like may be used. Examples of vinyl ethers include t-butyl vinyl
ether and benzyl vinyl ether. Moreover, the polyvinyl alcohol here may contain the following
monomer units. As these monomer units, olefins other than ethylene, such as propylene, 1butene and isobutene; unsaturated acids such as acrylic acid, methacrylic acid, maleic acid,
itaconic acid and maleic anhydride or salts thereof or carbon number 1 to 18 mono- or dialkyl
esters; acrylamides such as acrylamide, N-alkyl acrylamide having 1 to 18 carbon atoms, N, Ndimethyl acrylamide, 2-acrylamidopropane sulfonic acid or its acid salt or its quaternary salt
Methacrylamide, N-alkyl methacrylamide having 1 to 18 carbon atoms, N, N-dimethyl
methacrylamide, 2-methacrylamidopropanesulfonic acid or its salt,
methacrylamidopropyldimethylamine or its acid salt or its quaternary salt, etc. of Tacrylamides;
N-vinylamides such as N-vinylpyrrolidone, N-vinylformamide, N-vinylacetamide, etc .; allyl
compounds such as allyl acetate, allyl alcohol, 8-hydroxy-1-octene, etc. cyanogen such as
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acrylonitrile, methacrylonitrile Vinyl chlorides, vinyl ethers such as alkyl vinyl ethers having 1 to
18 carbon atoms, alkoxyalkyl vinyl ethers; vinyl chloride; vinyl fluorides such as vinylidene
chloride; vinyl halides such as vinylidene fluoride; dimethyl allyl alcohol, vinyl ketone, etc. .
[0035]
The first to third entangled members 2, 3 and 4 of the diaphragm 1 for a speaker device are not
limited to the entangled members obtained by the paper-making method described later, and
may be obtained by methods such as needle punch method, water jet method, flash spinning
method It may be a entangled body (eg, non-woven fabric).
[0036]
The first filler 20 and the second filler 40 improve the strength by being dispersed in each layer
(that is, increase the Young's modulus), and mica is exemplified, and the first filler 20 and the
second filler 40 May be identical or different from each other.
[0037]
According to the above configuration, the first binder is provided across the first layer L1 and the
second layer L2, and the second binder is provided across the third layer L3 and the second layer
L2, whereby the first layer L1 is formed. And the second layer L2 can be fixed securely, and the
second layer L2 and the third layer L3 can be fixed securely.
Furthermore, since the binder and the fiber are intertwined, compared with the configuration
using an adhesive, it is difficult to peel off due to aging, and the life can be extended.
[0038]
Furthermore, by increasing the Young's modulus of the first layer L1 and the third layer L3, the
internal loss can be increased by using an appropriate second fiber in the second layer L2, and
the Young of the entire diaphragm 1 for a speaker device can be increased. The internal loss can
be increased as the rate is increased.
In addition, by forming the first layer L1 and the third layer L3 having high Young's modulus on
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10
the front and back surfaces, the speaker device can be compared to a two-layer structure in
which a layer having a high Young's modulus is formed on one surface. The Young's modulus of
the entire diaphragm 1 can be increased, and the second fiber having a larger internal loss can
be used in the second layer L2 interposed therebetween.
[0039]
Next, a manufacturing method for manufacturing the speaker device diaphragm 1 by the papermaking method will be described. First, a first tank (not shown) in which a first fiber, a first
binder, and a first filler 20 are dispersed in a suitable solvent (for example, water), and a second
tank (not shown) in which a second fiber is dispersed in a suitable solvent And a third tank (not
shown) in which the third fiber, the second binder, and the second filler 40 are dispersed in an
appropriate solvent (for example, water). In the case where the first layer L1 and the third layer
L3 are configured by the same member, only the first tank may be prepared.
[0040]
Next, a cone-shaped (convex) net M as shown in FIG. 2 is dipped in the second tank and sucked
from the inside (upper side in the figure) to deposit the second fiber on the outside, The
entangled body 3 is manufactured. The net M is immersed in the third tank and suctioned from
the inside, and the third fiber, the second binder, and the second filler 40 are further deposited
on the outside to form the third entangled body 4. As shown in FIG. 2 (A), the mesh M is placed
on the lower mold D1 with the outer side of the mesh M facing downward, and then the mesh M
is removed.
[0041]
Furthermore, another net, not shown, is dipped in the first tank and suctioned from the inside,
thereby depositing the first fiber, the first binder, and the first filler 20 on the outside to form the
first intertwined body 2. The first entangled body 2 is placed on the third entangled body 4 and
the second entangled body 3 as shown in FIG. 2 (B). As shown in FIG. 2C, a pair of molds (upper
mold D2 and lower mold) is formed by sequentially stacking the first intermingled body 2, the
second intermingled body 3 and the third intermingled body 4 in this manner. Hold by D1), heat
and pressurize. At this time, the heating temperature may be a temperature at which each binder
can be melted.
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[0042]
As described above, by heating and pressing with a pair of molds, the first to third layers L1 to
L3 are formed, and the respective binders are melted to allow the second layer L2 to permeate
and form the second layer L2. The first permeation layer L21 and the second permeation layer
L22 are formed. At this time, holes D21 and D11 are formed in the upper mold D2 and the lower
mold D1, so that the evaporated solvent can be discharged at the time of heating.
[0043]
Next, the weight% of each member, the thickness of each layer, and the characteristics will be
specifically described. Tables 1 to 3 show Examples 1 and 2 and Comparative Examples 1 and 2.
Table 1 shows the weight% of each member when the total weight of each of the first layer, the
second layer, and the third layer is 100.
[0044]
[0045]
[0046]
[0047]
[Regarding Young's Modulus of Entire Diaphragm] In the diaphragm of Example 1, the sum of the
thicknesses of the first permeation layer, the second permeation layer, and the thickness is 15.7%
of the thickness of the second layer. In the diaphragm, the sum of the thickness of the first
permeation layer and the second permeation layer is 4.3% of the thickness of the second layer,
and the diaphragm of Comparative Example 1 includes the first permeation layer and the second
permeation layer. The sum of the thickness and the thickness is 21.1% of the thickness of the
second layer, and the Young's modulus of these diaphragms is a good value of 7.2 × 10 <9> N /
mm <2> or more. The
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12
On the other hand, in the diaphragm of Comparative Example 2, the sum of the thicknesses of
the first permeation layer and the second permeation layer is 2.9% of the thickness of the second
layer, and the Young's modulus is 2.5 × 10 <9> It was a low value of N / mm <2>.
That is, as the permeation layer becomes thicker, the Young's modulus of the whole diaphragm
can be improved, and when the permeation layer is thin, the Young's modulus is lowered.
[0048]
[About the internal loss of the whole diaphragm] The internal loss of the diaphragm of Examples
1 and 2 became a good value of 0.034 or more.
On the other hand, the internal loss of the diaphragm of Comparative Example 1 was 0.022, and
the internal loss of the diaphragm of Comparative Example 2 was a low value of 0.028. That is,
when the permeation layer has an appropriate thickness, a good internal loss can be obtained,
and when the permeation layer is thick as in Comparative Example 1, the internal loss of the
entire diaphragm decreases, as in Comparative Example 2. Even if the permeation layer is thin,
internal loss is reduced.
[0049]
[Regarding Fixing Forces Between Layers] In the diaphragms of Examples 1 and 2 and
Comparative Example 1, a sufficient fixing force for fixing the layers is obtained. On the other
hand, in the diaphragm of Comparative Example 2, the fixing force is not sufficient. It became
enough. That is, when the permeation layer is thick, sufficient fixation can be obtained, and when
the permeation layer is thin, the fixation is insufficient.
[0050]
The present invention is not limited to the above-described embodiment, but includes other
configurations and the like that can achieve the object of the present invention, and the following
modifications and the like are also included in the present invention.
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[0051]
For example, in the above-described embodiment, the second tangled body 3 and the first tangled
body 2 are formed by one net, and the third tangled body 4 is formed by overlapping the other
nets. Three entangled bodies may be machined, or entangled bodies respectively manufactured
by three nets may be overlapped.
[0052]
In the first and second embodiments, the weight% of each member and the thickness of each
layer are exemplified. However, the material is appropriately selected so that the Young's
modulus of the entire diaphragm for a speaker device is increased and the internal loss is
increased. While being selected, the weight% of each member or the thickness of each layer may
be set appropriately.
[0053]
Besides, the best configuration, method and the like for carrying out the present invention are
disclosed in the above description, but the present invention is not limited to this.
That is, although the present invention has been particularly illustrated and described primarily
with respect to particular embodiments, it should be understood that the present invention may
be configured relative to the above-described embodiments without departing from the scope of
the inventive concept and object. Those skilled in the art can make various modifications in
materials, quantities, and other detailed configurations.
Therefore, the description with the above-described disclosure of the shape, the material, etc. is
exemplarily described for facilitating the understanding of the present invention, and is not
intended to limit the present invention. The description in the name of a member from which
some or all of the limitations such as the limitation have been removed is included in the present
invention.
[0054]
Reference Signs List 1 diaphragm for speaker device 2 first interlacing body 3 second interlacing
body 4 third interlacing body 20 first filler 40 second filler L1 first layer L2 second layer L3
third layer L21 first permeation layer L22 intermediate layer L23 Second penetration layer D1
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Lower mold (pair of molds) D2 Upper mold (pair of molds)
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