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JPWO2013137362

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPWO2013137362
Abstract A diaphragm with high internal loss and high Young's modulus and good productivity
can be obtained. The speaker diaphragm 1 includes at least one layer 1A formed by molding a
component made of fiber and a fiber entangled body of synthetic fibers, and the synthetic fibers
are polyvinyl alcohol fibers having boron.
Speaker diaphragm, manufacturing method of speaker diaphragm
[0001]
The present invention relates to a speaker diaphragm and a method of manufacturing a speaker
diaphragm.
[0002]
Various materials such as paper-based materials, polymer (resin) -based materials, metal-based
materials, ceramic-based materials, composite-based materials, and the like are used as
constituent materials of the speaker diaphragm.
A diaphragm made of paper made of natural fibers or non-woven fabric made of synthetic fibers
is also known. Among these, paper-based diaphragms using natural fibers generally have the
advantages of low density, large internal loss, and easy manufacture, and are widely used.
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1
[0003]
The prior art in the production method of the paper type diaphragm includes a paper making
(paper making) step of making a diaphragm material, a preliminary drying step of drying the
material made by paper making and evaporating water, and a preform obtained by the
preliminary drying step. The thing provided with the press-forming process which press-molds is
known (for example, following patent document 1, two references).
[0004]
JP, 2011-146769, A JP, 48-57615, A
[0005]
The physical properties required of the speaker diaphragm are to increase the internal loss and
to increase the Young's modulus or specific modulus (E / ρ; E is the Young's modulus of the
diaphragm material, and ρ is the density of the diaphragm material). It is in.
Generally, with the speaker diaphragm, the Young's modulus tends to decrease when the internal
loss is increased, and the internal loss tends to decrease when the Young's modulus is increased.
As described above, although the paper speaker diaphragm using a natural fiber generally has a
large internal loss and a low density, the Young's modulus tends to be small. On the other hand,
the Young's modulus of a paper type diaphragm may be improved by mixing fillers, such as mica,
with natural fiber.
[0006]
In the case of mixing a filler such as mica with a fiber, there is a case where a fiber composed of a
water-soluble polyvinyl alcohol which is soluble in warm water is further mixed with a natural
fiber as a binder. However, since the fibers composed of polyvinyl alcohol are water-soluble, the
fibers composed of polyvinyl alcohol adhere to the net used in the paper-making process and the
mold used in the forming process and become difficult to peel off. There is a problem that the
handling property of the product is reduced and good productivity can not be obtained.
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[0007]
Further, as described in Patent Document 2, it is also conceivable to bond the layers formed in
separate steps, but in this case, an adhesive that increases the weight of the diaphragm is
required. Moreover, when each layer is bonded together without using an adhesive agent, there
is a problem that it becomes easy to produce exfoliation.
[0008]
The present invention takes an example of the problem to address such a problem. That is, an
object of the present invention is to obtain a speaker diaphragm having a relatively high internal
loss and Young's modulus, to be able to provide a speaker diaphragm and a method for
manufacturing a speaker diaphragm from which high productivity can be obtained, etc. It is.
[0009]
In order to achieve such an object, the speaker diaphragm and the method of manufacturing the
speaker diaphragm of the present invention have the following features.
[0010]
A polyvinyl alcohol comprising at least one layer, wherein the layer is constituted by a
component which is a fiber entangled body, the fiber entangled body is constituted by a fiber and
a synthetic fiber different from the fiber, and the synthetic fiber comprises boron. A speaker
diaphragm characterized by being a system fiber.
[0011]
A method of manufacturing a speaker diaphragm, wherein the speaker diaphragm has at least
one layer, and has a forming step of forming the one layer into a prescribed shape, and a
component of the one layer is Manufacture of a speaker diaphragm characterized in that it is
constituted by a fiber entangled body, the fiber entangled body is constituted by a fiber and a
synthetic fiber different from the fiber, and the synthetic fiber is a polyvinyl alcohol fiber having
boron. Method.
[0012]
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3
It is explanatory drawing which shows the structure of the speaker diaphragm which concerns
on embodiment of this invention (The whole schematic of the cross section of FIG. 1 (a), FIG.1 (b)
is the A section enlarged view of a section).
It is an explanatory view showing a manufacturing method of a speaker diaphragm concerning
an embodiment of the present invention.
It is an explanatory view showing a manufacturing method of a speaker diaphragm concerning
an embodiment of the present invention.
It is an explanatory view showing a manufacturing method of a speaker diaphragm concerning
an embodiment of the present invention. It is an explanatory view showing a manufacturing
method of a speaker diaphragm concerning an embodiment of the present invention. It is an
explanatory view showing an example of structure of a speaker diaphragm concerning an
embodiment of the present invention (A section enlarged view of a section). It is an explanatory
view showing an example of structure of a speaker diaphragm concerning an embodiment of the
present invention (Drawing 7 (a) shows a partial top view and Drawing 7 (b) shows an opening
pattern of a metal mesh). It is an explanatory view showing an example of structure of a speaker
diaphragm concerning an embodiment of the present invention (photograph which shows the
whole). It is an explanatory view showing a speaker device provided with a speaker diaphragm
concerning an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It
is explanatory drawing which showed the electric equipment, the motor vehicle, and the building
which mounted the speaker apparatus provided with the speaker diaphragm which concerns on
embodiment of this invention.
[0013]
Hereinafter, embodiments of the present invention will be described. The speaker diaphragm
according to the embodiment of the present invention includes at least one layer formed by
shaping a component made of a fiber and a fiber entangled body of synthetic fibers different
from the fiber into a prescribed shape. The synthetic fibers used here are, for example, polyvinyl
alcohol fibers having boron. If an example of the polyvinyl-alcohol-type fiber which has boron is
mentioned, it can be comprised by the polyvinyl-alcohol-type resin which has a boric acid, and
the polyvinyl alcohol-type resin which has boron bridge | crosslinking. An example of the
molecular structure of the polyvinyl alcohol resin having boron is shown in the following
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formula.
[0014]
[0015]
[0016]
[0017]
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 Can be obtained by hydrolysis (saponification, alcoholysis,
etc.).
Here, as a vinyl ester, vinyl acetate is mentioned as a representative example, and in addition,
vinyl formate, vinyl propionate, vinyl pivalate, vinyl valerate, vinyl caprate, vinyl benzoate and the
like can be mentioned.
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, 1-butene 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, N-dimethyl 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,
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etc .; allyl compounds such as allyl acetate, allyl alcohol, 8-hydroxy-1-octene, etc. cyanogen such
as 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. .
[0018]
In the speaker diaphragm according to the embodiment of the present invention, physical
properties (internal loss and Young's modulus) of the diaphragm can be obtained, for example, by
molding a component made of a fiber entangled body of polyvinyl alcohol fibers having fibers
and boron. It can be improved in a well-balanced manner. In addition, by using polyvinyl alcohol
fibers having boron insoluble in water, handling in the paper making process becomes easy and
releasability in the forming process becomes good, so that good productivity can be obtained.
Can. In the papermaking process, for example, the component members can be easily removed
from the net used for papermaking. In the molding step, for example, the component can be
easily removed from the mold. In addition to polyvinyl alcohol fibers having boron described
above, any polyvinyl alcohol fibers having insolubility in water or hot water exceeding 80 ° C.
can be applied to the present invention. As this polyvinyl alcohol-based fiber, those having a
crosslinked structure with a relatively large molecular weight can be mentioned. In addition,
although the embodiment using the polyvinyl-alcohol-type fiber which has boron below is
described, it is not limited to this, It replaces with the polyvinyl alcohol-type fiber which has
insolubility with respect to water or hot water exceeding 80 degreeC. Embodiments are to be
described.
[0019]
In addition, the speaker diaphragm according to the embodiment of the present invention
includes, for example, a first layer and a second layer, and the first layer and the second layer are
respectively the first components of the fiber entangled body. And the second component
member is formed into a prescribed shape, the fiber entangled body of the first component
member is made of fibers and synthetic fibers different from the fibers, and the fiber entangled
member of the second component member is It is comprised by the fiber and this synthetic fiber
is comprised by the polyvinyl-alcohol-type fiber which has boron. With the speaker diaphragm
having such a configuration, the physical properties (internal loss and Young's modulus) of the
speaker diaphragm can be improved in a well-balanced manner as described above, and high
productivity can be obtained. . In addition, the bonding force or the adhesion between the first
layer and the second layer can be enhanced because the speaker diaphragm includes the
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polyvinyl alcohol fiber having boron. The fibers in the first component and the fibers in the
second component may be substantially the same or different.
[0020]
In the speaker diaphragm according to the embodiment of the present invention, for example, the
synthetic fiber described above has a bent shape (including a bent shape). When the synthetic
fiber has a bent shape, the synthetic fiber is easily entangled with the fiber, and the Young's
modulus of the speaker diaphragm can be improved. In addition, when the speaker diaphragm
has a multilayer structure, the bonding force or adhesion between the first layer and the second
layer can be enhanced by the synthetic fiber having the above-described shape.
[0021]
In the speaker diaphragm according to the embodiment of the present invention, the crosssectional shape of the synthetic fiber described above is circular. By this, it becomes difficult to
produce a crack in a fiber and it becomes possible to maintain the physical property of the
diaphragm for speakers over a long period of time.
[0022]
In the speaker diaphragm according to the embodiment of the present invention, for example, the
above-mentioned fiber is a natural fiber. The fibers described above may be other fibers to be
described later other than natural fibers. Speaker diaphragms having natural fibers have
relatively large internal losses. Further, one layer of the speaker diaphragm according to the
embodiment of the present invention or the above-described first layer has, for example, mica. By
using a polyvinyl alcohol-based fiber having boron as a synthetic fiber, it is possible to prevent
mica from adhering to the synthetic fiber and dropping the mica from the speaker diaphragm.
When the speaker diaphragm has mica, the Young's modulus of the speaker diaphragm can be
improved. In addition, good glossiness appears on the surface of the speaker diaphragm having
mica, and good design can be obtained. In addition, when the speaker diaphragm has a multilayer
structure, the Young's modulus of the speaker diaphragm can be increased by the first layer
having mica. Moreover, when the first layer having mica is a surface layer, the design of the
speaker diaphragm can be enhanced. Further, even if all the layers do not have mica, the Young's
modulus can be improved and the design can be improved, so that the amount of mica used can
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be reduced, and the total weight and cost of the speaker diaphragm can be reduced. In this case,
for example, only the first layer which is substantially the surface layer may be provided with
mica.
[0023]
Further, in the case where the speaker diaphragm according to the embodiment of the present
invention has a multilayer structure, for example, the above-mentioned second layer may be
substantially constituted of only fibers. By forming the second layer of fibers, the internal loss
and the Young's modulus of the speaker diaphragm can be adjusted. The weight of the synthetic
fiber (polyvinyl alcohol fiber having boron) herein may be smaller than the weight of the fiber.
The Young's modulus and internal loss of the speaker diaphragm can be adjusted by adding an
appropriate amount of boron-containing polyvinyl alcohol fibers to other fibers (for example,
natural fibers) to constitute a component. In addition, the second layer is made of fibers, and the
first layer is made of mica, fibers and synthetic fibers, whereby the amount of mica used or the
amount of synthetic fibers used can be reduced. The second layer may be made of fibers and
synthetic fibers, and is not particularly limited.
[0024]
The speaker diaphragm according to the embodiment of the present invention has only a single
layer composed of a fiber entangled body, the internal loss and the Young's modulus of which are
substantially composed of the aforementioned fibers (for example, natural fibers). It is large with
respect to the internal loss and Young's modulus of the comparison diaphragm having. Further,
the speaker diaphragm according to the embodiment of the present invention has a larger
internal loss and Young's modulus than the comparative diaphragm having only a single layer
composed of the fiber entangled body of the second layer. That is, in the case of a single layer,
the speaker diaphragm according to the embodiment of the present invention has, for example,
an internal loss of greater than 0.0216 and a Young's modulus of 4.40 × 10 <9> (N / mm <2 >)
Greater than. In the case of a multilayer diaphragm, the speaker diaphragm according to the
embodiment of the present invention has, for example, an internal loss of greater than 0.0239
and a Young's modulus of 3.5 × 10 <9> (N / mm <2>) ) Greater than.
[0025]
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8
In the above-described method for manufacturing a speaker diaphragm according to the
embodiment of the present invention, the speaker diaphragm includes at least one layer, and a
step of forming a component forming the one layer, and the component And a forming process
for forming the same into a prescribed shape. In addition, if necessary, the process of forming the
component members may be omitted, and the component members procured from the outside
may be formed into a prescribed shape in the forming process. In this case, the method of
manufacturing the speaker diaphragm includes at least a forming step. The component
constituting one layer is constituted by a fiber entangled body. Moreover, the fiber entangled
body of this component is comprised with a fiber and a synthetic fiber different from the said
fiber. The synthetic fiber here is a polyvinyl alcohol-based fiber having boron, and more
specifically, is composed of a polyvinyl alcohol-based resin having boron.
[0026]
Further, in the above-described method for manufacturing the speaker diaphragm, the speaker
diaphragm includes the first layer and the second layer, and the first component and the second
layer constituting the first layer are It has the overlapping process and the formation process
which overlap the 2nd component to comprise. In the forming step, the first component member
and the second component member stacked in the overlapping step are formed into a prescribed
shape. The second component is constituted by a fiber entangled body. The fiber entangled body
of the second component is composed of fibers. The second component may contain a synthetic
fiber. In addition, the above-described method of manufacturing the speaker diaphragm includes
the steps of forming the first component forming the first layer and forming the second
component forming the second layer.
[0027]
The process of forming the first component and the process of forming the second component
may be performed in parallel. By simultaneously advancing the forming process of the first
component and the forming process of the second component, the tact time of the manufacturing
process can be shortened, and the productivity can be enhanced.
[0028]
In the step of forming the first component, for example, the first net is placed and formed in a
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first tank into which a suspension in which fibers, which are natural fibers and synthetic fibers
are dispersed, is injected. This deposits the first component on the first mesh. In the step of
forming the second component, for example, a first net or a second net is placed in a second tank
in which a suspension in which fibers, which are natural fibers, are dispersed is injected to form a
sheet. When the first net is disposed in the second tank, the second component is deposited on
the first component deposited on the first net. When the second net is disposed in the second
tank, the second component is deposited on the second net. In addition to synthetic fibers,
synthetic fibers may be contained in the fibers.
[0029]
In the method of manufacturing the speaker diaphragm according to the embodiment of the
present invention, in the overlapping step, the first component attached to the first mesh and the
second component attached to the second mesh are overlapped. The first component and the
second component may be stacked in the first tank or the second tank. In addition, when the first
component and the second component are stacked, the bottom of one of the first and second
nets is the bottom of the tank relative to the outer circumference of the one of the nets. The
bottom of the other net is disposed on the bottom of the tank relative to the outer circumference
of the other net. Further, in the overlapping step, the first component and the second component
are overlapped between the first net and the second net so that the first component and the
second component are separated. It can be made to adhere in the overlapping step.
[0030]
In the method of manufacturing the speaker diaphragm according to the embodiment of the
present invention, in the forming step, the first and second component members stacked are held
by the first mold and the second mold. The first component and the second component are
heated through the first mold or the second mold. Here, the first mold has, for example, a
concave cross-sectional shape as a shape corresponding to the shape of the diaphragm. The
second mold has a cross-sectional shape corresponding to the cross-sectional shape of the first
mold. The temperature of the first mold or the second mold may be 100 ° C. or more. The
dissolution temperature of the above-mentioned synthetic fiber in water is higher than 80 ° C.
Also, in the molding step, when the ambient temperature is 100 ° C. or higher, polyvinyl alcohol
fibers (synthetic fibers) insoluble in water or hot water are melted to bond a plurality of fibers
together, or It may be filmed.
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[0031]
The first mold is disposed on the second component side, and the second mold is disposed on the
first component side. A first mesh may be disposed between the second mold and the first
component. The second mold may have a hole for communicating the space between the second
mold and the first component with the outside. Since the second mold includes the hole, the
water vapor in the space between the second mold and the first component can be discharged to
the outside. The discharge of water vapor can reduce the internal pressure in the space between
the second mold and the first component. By reducing the internal pressure, air compressed by
the increase in internal pressure rapidly leaks from the gap between the second mold and the
first mold to the outside, thereby preventing the speaker diaphragm from being broken. it can.
[0032]
Also, a second mesh may be disposed between the first mold and the second component. The
first mold may have a hole communicating the space between the first mold and the second
component with the outside. Since the first mold is provided with the holes, the water vapor in
the space between the first mold and the second component can be discharged to the outside.
The discharge of water vapor can reduce the internal pressure in the space between the first
mold and the second component. By reducing the internal pressure, the compressed air due to
the increase in internal pressure rapidly leaks from the gap between the first mold and the
second mold to the outside, whereby the speaker diaphragm is broken. It can be deterred.
[0033]
In the method of manufacturing the speaker diaphragm according to the embodiment of the
present invention, the synthetic fiber to be mixed with the natural fiber is a polyvinyl alcohol
fiber having boron, so that it is molded at a high temperature of 100 ° C. or higher Also, high
releasability can be obtained.
[0034]
Hereinafter, embodiments of the present invention will be more specifically described with
reference to the drawings.
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FIG. 1 is an explanatory view showing a structure of a speaker diaphragm according to an
embodiment of the present invention (an overall schematic view of a cross section in FIG. 1A, and
FIG. 1B is an enlarged view of a portion A in cross section). The speaker diaphragm 1 according
to the embodiment of the present invention has, for example, a cone shape as shown in FIG. 1 (a),
and as shown in FIG. 1 (b), the first layer (surface layer) 1A and the first layer (surface layer) It
has two layers (back layer) 1B. In the following description, although an example of a two-layer
structure is described, the speaker diaphragm according to the embodiment of the present
invention has three or more layers having a layer having a synthetic fiber even if it has a single
layer structure having a synthetic fiber It may have a multi-layered structure of Also, natural
fibers are described as an example of the aforementioned fibers.
[0035]
The first layer 1A and the second layer 1B are formed by, for example, molding at one time by
overlapping the first component and the second component which are both configured by a fiber
entangled body. The first component corresponding to the first layer 1A is formed by mixing
natural fibers and synthetic fibers and formed into a sheet, and the second component
corresponding to the second layer is formed by forming a natural fiber It is. Here, the synthetic
fiber to be mixed with the first component member is a polyvinyl alcohol-based fiber having
boron which is composed of a polyvinyl alcohol-based resin having boron.
[0036]
The synthetic fiber comprising a polyvinyl alcohol resin having boron used herein is one
substantially insoluble in water at about 20 ° C. Moreover, the planar shape of this synthetic
fiber is a bending shape (including a refractive shape). Moreover, the cross section of this
synthetic fiber is substantially circular. By including this synthetic fiber in the fiber entangled
body of the first component corresponding to the first layer, the physical properties of the
speaker diaphragm 1 can be improved, and the first layer 1A and the second layer 1A can be
used. The bondability of the layer 1B can be enhanced.
[0037]
Here, the ratio of the natural fiber to the synthetic fiber in the first layer 1A may be such that the
weight of the synthetic fiber is smaller than the weight of the natural fiber. Moreover, by mixing
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12
mica with natural fibers and synthetic fibers in the first component member, the density of the
speaker diaphragm is relatively small and lightweight, and the Young's modulus and internal loss
of the diaphragm are relatively high. Become. Further, by mixing mica with the natural fiber and
the synthetic fiber of the first component member, it is possible to obtain good design and high
productivity.
[0038]
The fibers used for the speaker diaphragm 1 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, etc. Synthetic fibers, animal fibers such as silk and wool, plant fibers
such as manila hemp and cotton, organic fibers composed of graphite, inorganic fibers composed
of silicon carbide and the like (glass fibers, carbon fibers, ceramic fibers), basalt And mineral
fibers, etc. The natural fibers here include wood pulp fibers, non-wood pulp fibers, plant fibers,
animal fibers and the like. The fiber entangled body used for the speaker diaphragm 1 is a fiber
entangled body obtained by a papermaking method described later, a fiber entangled body
obtained by a method such as a needle punch method, a water jet method, a flash spinning
method (example: non-woven fabric) It can be mentioned. The polyvinyl alcohol-based fiber
(synthetic fiber) insoluble in water or hot water such as a polyvinyl alcohol-based resin having
boron may be a fiber to which a fiber (such as a natural fiber) is adhered.
[0039]
2 to 5 are explanatory views showing a method of manufacturing a speaker diaphragm according
to an embodiment of the present invention. 2 and 3 show the schematic flow. In the schematic
flow shown in FIG. 2, the method of manufacturing the speaker diaphragm according to the
embodiment of the present invention corresponds to the first component forming step S1
corresponding to the first layer 1A and the second layer 1B. And a forming step S3. Here, the
first component forming step S1 corresponding to the first layer 1A is, for example, a papermaking step in which natural fibers (fibers) and the above-described synthetic fibers are mixed,
and a second corresponding to the second layer 1B. The component forming step S2 is, for
example, a paper making step using natural fibers (fibers). In the first component forming step
S1, a net is disposed in one tank (for papermaking) and the first component is deposited on the
net, and in the second component forming step S2, they are different. The net on which the first
component is deposited is moved to a tank (for papermaking) to stack the second component on
the first component. Thereby, the stacking process of the first component and the second
component is performed in the tank. Thereafter, the two nets described above and the first
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component and the second component attached to the net are moved into the pair of molds, and
the first component and the second part are transferred between the pair of molds And heat
molded or pressure molded into a desired shape (molding step S3).
[0040]
In the schematic flow shown in FIG. 3, the step S1-1 of forming the first component
corresponding to the first layer 1A is, for example, a paper-making step in which natural fibers
(fibers) and the aforementioned synthetic fibers are mixed. The formation step S2-1 of the second
component corresponding to the second layer 1B is, for example, a paper-making step using
natural fibers (fibers). The forming step S1-1 of the first component and the forming step S2-1 of
the second component are performed in parallel in separate steps using different tanks (for
papermaking). In the subsequent overlapping step S3-1, the formed first component and the
second component are overlapped, and in the subsequent forming step S4-1, the overlapped first
component and second component are formed. The component members are held between a pair
of molds, and heat molded or pressure molded into a desired shape (molding step S3-1).
[0041]
FIG. 4 is an explanatory view showing a specific example of each step described above. In the
first component forming step S1, with the outer peripheral portion of the cone-shaped (convex)
net (first net) 2A directed to the bottom surface side of the tank, the net 2A is disposed in the
tank It arrange | positions on the base 4 which has 4 A of holes. The suction holes 4A of the table
4 are connected to the suction machine 5 and disposed on the side of the knitting 2A. Next, as
shown in FIG. 4A, the platform 4 is lowered to immerse the net 2A in a tank 3A (first tank) filled
with a suspension in which natural fibers and synthetic fibers are dispersed. . Then, the first
component 1A1 is deposited on the net 2A by suctioning the suspension through the suction
holes 4A with the suction unit 5 on the bottom side.
[0042]
In the second component forming step S2, as shown in FIG. 4B, the outer peripheral portion of
the cone-shaped net (first net) 2A on which the first components 1A1 are deposited is placed on
the bottom surface side of the tank In the oriented state, the net 2A is placed on the table 4
having the suction holes 4A disposed in the tank 3B. As in FIG. 4A, the suction hole 4A is
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connected to the suction device 5. Next, the platform 4 is lowered to immerse the net 2A in a
tank 3B (second tank) filled with a suspension in which natural fibers are dispersed. Thereafter,
the second component 1B1 is deposited on the first component 1A1 by suctioning the
suspension through the suction holes 4A with the suction unit 5 on the bottom surface side of
the tank 3B. Thus, the stacking process is performed in the tank 3B.
[0043]
Next, as shown in FIG. 4C, the mesh 2A on which the first component 1A1 and the second
component 1B1 are deposited in the first mold (lower mold) 6A is reversed. Deploy. That is, the
bottom of the net 2A is disposed on the first mold 6A side. Next, air is sucked from the hole 6A1
provided in the first mold (lower mold) 6A to form the first component 1A1 and the second
component 1B1 from the mesh 2A to the first mold Transfer to lower mold 6A. The mesh 2A may
be removed from the first mold 6A or may be disposed as it is in the first mold 6A.
[0044]
After that, in the forming step S3, as shown in FIG. 4D, the first component 1A1 and the second
component 1B1 disposed in the first mold (lower mold) 6A Place 2 mold (upper mold) 6B. Next,
in a state where the first component 1A1 and the second component 1B1 are held between the
first mold (lower mold) 6A and the second mold (upper mold) 6B, the first configuration The
member 1A1 and the second component 1B1 are heated or pressurized via the first mold (lower
mold) 6A and the second mold (upper mold) 6B. After heating or pressurizing, water is removed
from the first component 1A1 and the second component 1B1 to be formed into a desired shape.
[0045]
At this time, the first mold (lower mold) 6A is disposed on the second component 1B1 side, and
the second mold (upper mold) 6B is disposed on the first component 1A1 side. A first net 2A is
disposed between the second mold (upper mold) and the first component 1A1. The second mold
(upper mold) 6B includes a hole 6B1 communicating the space between the second mold 6B and
the first component 1A1 with the outside.
[0046]
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In the example shown in FIG. 4, since the second mold (upper mold) 6B presses the first
component 1A1 through the mesh 2A, the hole of the second mold (upper mold) 6B It is possible
to prevent the first component 1A1 from blocking the 6B1. Thus, the steam can be smoothly
exhausted from the hole 6B1 in the forming step S3, and the forming can be performed.
[0047]
FIG. 5 is an explanatory view showing another specific example of the process described above.
In the first component forming step S1-1, as shown in FIG. 5A, the outer peripheral portion of the
cone-shaped (convex) mesh (first mesh) 2A is directed to the bottom surface of the tank. Then,
the net 2A is placed on the base 4 having the suction holes 4A disposed in the tank. The suction
hole 4A is connected to the suction device 5. Next, the platform 4 is lowered to immerse the net
2A in a tank 3A (first tank) filled with a suspension in which natural fibers and synthetic fibers
are dispersed. Thereafter, the first component 1A1 is deposited on the net 2A by suctioning the
suspension through the suction holes with the suction unit 5 on the bottom side.
[0048]
In the second component forming step S2-1, as shown in FIG. 5B, the net 2B is formed with the
outer peripheral portion of the cone-shaped net (second net) 2B directed to the bottom surface
side of the tank. Are placed on the table 4 having the suction holes 4A disposed in the tank 3B.
As in FIG. 5A, the suction hole 4A is connected to the suction device 5. Next, the platform 4 is
lowered to immerse the net 2B in a tank 3B (second tank) filled with a suspension in which
natural fibers are dispersed. Thereafter, the second component 1B1 is deposited on the net 2B by
suctioning the suspension through the suction holes 4A with the suction unit 5 on the bottom
surface side of the tank 3B.
[0049]
In the overlapping step S3-1, as shown in FIG. 5C, first, the net 2B on which the second
component 1B1 is deposited is disposed in the first mold (lower mold) 6A. At this time, the net
2B is disposed on the first mold (lower mold) 6A. Thereafter, as shown in FIG. 5D, the net 2A on
which the first component 1A1 is deposited is inverted and disposed in the first mold (lower
10-05-2019
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mold) 6A. That is, the bottom of the net 2A is disposed on the first mold 6A side. Next, air is
sucked from the hole 6A1 provided in the first mold (lower mold) 6A, and the first component
1A1 is stacked on the second component 1B1.
[0050]
In FIG. 5C, the first component 1A1 is stacked on the second component 1B1 in the first mold
6A, but the method of stacking is not limited to this. For example, there is also the following
method.
[0051]
After the first component 1A1 is deposited on the first net 2A and the second component 1B1 is
deposited on the second net 2B, it is placed on the platform 4 pulled up from within the
suspension on the tank 3B. The first network 2A is placed on the second network 2B. The air is
sucked through the suction holes 4A of the platform 4 in the tank 3B, and the first component
1A1 deposited on the first net 2A is superimposed on the second component 1B1. The first
component 1A1 deposited on the first mesh 2A without suctioning air may be stacked on the
second component 1B1. In this case, the predetermined stacked first component 1A1 and the
second component 1B1 have a predetermined moisture content. In the stacking method
described above, although the stacking is performed on the tank 3B, the stacking may be
performed on the tank 3A. In addition, since one of the first net 2A or the second net 2B is
removed from the tank when the above-described stacking method is performed, one of the first
net 2A or the second net 2B in the forming step described later. Need not be removed from
within the first mold 6A.
[0052]
In the subsequent molding step S4, as shown in FIG. 5 (d), the mesh 2A is removed from the first
mold 6A, and as shown in FIG. 5 (e), the first mold (lower mold) The second mold (upper mold)
6B is placed on the first component 1A1 and the second component 1B1 arranged in 6A, and the
first component 1A1 and the second component 1B1 are arranged. By heating or pressurizing,
the moisture of the first component member 1A1 and the second component member 1B1 is
removed to form a desired shape.
[0053]
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At this time, the first mold 6A is disposed on the second component 1B1 side, and the second
mold 6B is disposed on the first component 1A1 side.
The second mesh 2B is disposed between the first mold 6A and the second component 1B1. The
first mold 6A includes a hole 6A1 communicating the space between the first mold 6A and the
second component 1B1 with the outside.
[0054]
In the example shown in FIG. 5, since the second component 1B1 is disposed in the first mold
(lower mold) 6A via the mesh 2B, the hole of the first mold (lower mold) 6A It is possible to
prevent the second component 1B1 from blocking the portion 6A1. As a result, the steam can be
smoothly exhausted from the hole 6A1 in the forming step S4, and the forming can be
performed.
[0055]
Hereinafter, embodiments of the present invention will be described. Table 1 shows examples of
the present invention and comparative examples.
[0056]
[0057]
The speaker diaphragm in the first embodiment has a two-layer structure.
The first layer (surface layer) of this speaker diaphragm is composed of 50 parts by weight of
natural fiber, 10 parts by weight of synthetic fiber A, 40 parts by weight of mica, and the second
layer (back layer) is natural Fiber: 100 parts by weight. Synthetic fiber A is an example of a
polyvinyl alcohol-based fiber having boron.
10-05-2019
18
[0058]
Example 1 is a comparative example 1 that does not contain a polyvinyl alcohol-based fiber
(synthetic fiber A) having boron in the first layer by substantially the same weight as the weight
of the speaker diaphragm in Example 1. Comparative Example 4 in which the weight is smaller
than the weight of the speaker diaphragm in the speaker, and the first layer does not contain the
polyvinyl alcohol fiber (synthetic fiber A) having boron, and the synthetic fiber A (the first layer
of Example 1 has Compared with Comparative Example 3 in which synthetic fiber B (polyvinyl
alcohol) is used in place of the polyvinyl alcohol fiber having boron, high Young's modulus, high
internal loss, and low density are shown.
[0059]
In Example 1, a polyvinyl alcohol-based fiber (synthetic fiber A) having boron adheres mica to a
fiber entangled body, so that high design with gloss can be obtained.
In addition, Example 1 facilitates handling in the papermaking process by mixing a polyvinyl
alcohol-based fiber having boron substantially insoluble in hot water at high temperature, and
also releasability in the forming process. Because it is good, productivity can be improved.
[0060]
The speaker diaphragm of Example 2 has a single-layer structure. The speaker diaphragm is
composed of 50 parts by weight of natural fiber, 10 parts by weight of synthetic fiber A, and 40
parts by weight of mica.
[0061]
Example 2 is smaller in weight than the speaker diaphragm of Example 1 and Comparative
Example 7 which does not contain a polyvinyl alcohol-based fiber having boron at substantially
the same weight as the weight of the speaker diaphragm of Example 2. Compared to Comparative
Example 5 in which the synthetic fiber B (polyvinyl alcohol) is used instead of the synthetic fiber
A possessed by the speaker diaphragm of Example 2 and Comparative Example 6 that does not
10-05-2019
19
contain a polyvinyl alcohol-based fiber having boron. The high Young's modulus, the high
internal loss and the high specific elastic modulus (Young's modulus / density) are shown (the
specific elastic modulus of Example 2 is 10.28 × 10 <9> (m <2> / s <2>), the comparison The
specific elastic modulus of Example 7 is 6.077 × 10 <9> (m <2> / s <2>), and the specific elastic
modulus of Comparative Example 6 is 6.955 × 10 <9> (m <2> / s <2>) The specific modulus of
Comparative Example 5 is 10.06 × 10 <9> (m <2> / s <2>). Similar to the first embodiment, the
second embodiment can obtain high design with high gloss, and can improve productivity.
[0062]
The speaker diaphragm of the third embodiment has a two-layer structure as in the first
embodiment. In this speaker diaphragm, the first layer (surface layer) is composed of 50 parts by
weight of natural fiber, 60 parts by weight of synthetic fiber A, 40 parts by weight of mica, and
the second layer (back layer) is a natural fiber 100 parts by weight.
[0063]
Example 3 shows higher Young's modulus and higher internal loss compared to Comparative
Example 4. Further, in the same manner as in the first embodiment, the third embodiment can
obtain high design with high glossiness and can obtain high productivity. Comparative Example 9
in which synthetic fiber A (polyvinyl alcohol fiber having boron) of Example 3 is replaced with
synthetic fiber B (polyvinyl alcohol) has high moldability and is difficult to handle in the paper
making process, so high productivity is obtained. Absent.
[0064]
The speaker diaphragm of the fourth embodiment has a single-layer structure as in the second
embodiment. This diaphragm is composed of 50 parts by weight of natural fiber, 60 parts by
weight of synthetic fiber A, and 40 parts by weight of mica.
[0065]
Example 4 shows high Young's modulus and high internal loss compared to Comparative
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20
Example 6. Further, in the fourth embodiment, similarly to the first embodiment, high design
with high gloss can be obtained, and high productivity can be obtained. Comparative Example 10
in which the synthetic fiber A (polyvinyl alcohol fiber having boron) of Example 4 is replaced
with the synthetic fiber B (polyvinyl alcohol) has high moldability and poor handleability in the
paper making process, so high productivity Can not be obtained.
[0066]
As described above, the speaker diaphragm according to the embodiment of the present
invention and the method for manufacturing the same can have a high Young's modulus and a
high interior by mixing the fiber and the polyvinyl alcohol fiber having boron in the speaker
diaphragm. A loss can be obtained, and when the speaker diaphragm has a multilayer structure,
the bonding strength or adhesion between the layers can be improved by the polyvinyl alcohol
fiber having boron. In addition, by using a polyvinyl alcohol-based fiber having boron
substantially insoluble in high temperature hot water, the handleability in the paper making
process can be improved, and further, the releasability in the molding process can be improved.
High productivity can be obtained. Furthermore, since mica adheres to the polyvinyl alcohol fiber
which has boron by combining and mixing mica | cuttle-fish, favorable glossiness is obtained and
high designability can be obtained.
[0067]
The structural example of the speaker diaphragm according to the embodiment of the present
invention will be more specifically described with reference to FIGS. 6 shows an enlarged
explanatory view of a specific configuration example of the A portion in FIG. 1, and FIG. 7 (a)
shows a plan explanatory view thereof. In this example, the speaker diaphragm includes a first
layer 1A and a second layer 1B. Although the two-layer structure is shown in the drawing, the
first layer 1A and the second layer 1B may be included in a multilayer structure of three or more
layers. Here, the first layer 1A can be composed of polyvinyl alcohol fibers having boron, and the
second layer 1B is made of other fibers different from the polyvinyl alcohol fibers having boron,
for example, natural fibers It can be configured. In addition, the first layer 1A may be composed
of only polyvinyl alcohol fibers having boron, or is composed of polyvinyl alcohol fibers having
boron and other different fibers (for example, natural fibers). And the second layer 1B may
include polyvinyl alcohol-based fibers having boron, in which case the first layer 1A and the
second layer 1B are the same fiber. It does not matter.
10-05-2019
21
[0068]
The first layer 1A is made of polyvinyl alcohol fiber having mica and boron. In addition, the first
layer 1A includes a plurality of regions M in which mica exists, and a region P in which no mica
exists is formed between the regions M in which a plurality of mica exists.
[0069]
When the first layer 1A including the area M where mica exists and the area P where mica does
not exist is formed in the surface layer, a pattern etc. is formed by the area M where mica exists
on the surface of the speaker diaphragm. A desired design can be formed. FIG. 8 is a diagram
(photograph) showing an example of a speaker diaphragm in which a design is formed on the
surface by a region M where mica exists. The glossy part that appears white in the figure is the
area where mica exists.
[0070]
In the case where a plurality of areas M where mica exists is provided in the first layer 1A, first, a
wire mesh having openings S only in areas where mica is to be deposited is used to form the first
layer 1A in the first tank. Form a papermaking material. At this time, polyvinyl alcohol fibers
having mica and boron are deposited at the openings of the wire mesh. Next, the wire mesh on
which the paper-making products forming the first layer 1A are deposited is pulled up from the
first tank, and this wire-mesh is immersed in the second tank to form a paper-making product
forming the second layer 1B. Deposit on the first layer 1A. The deposit in which the first layer 1A
and the second layer 1B are deposited is held by a heated mold and dried to obtain a speaker
diaphragm in which a plurality of regions M in which mica exists are formed. In addition, if the
1st layer 1A and the 2nd layer 1B can be formed not only in the manufacturing method
mentioned above, you may change the above-mentioned manufacturing method. For example, a
papermaking material forming the second layer 1B is formed, and in parallel with the formation
of the papermaking material, only a wire mesh (area where it is desired to deposit mica as shown
in FIG. 7 (b) corresponding to a pattern etc. By using a wire mesh having an opening S), a papermade product constituting the first layer 1A is formed, and by bonding these paper-formed
products, a speaker diaphragm having a plurality of regions M in which mica exists is obtained.
Be
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22
[0071]
In this speaker diaphragm, since polyvinyl alcohol fiber having boron is contained in the first
layer 1A, this fiber and mica can be bonded to prevent the mica from falling off from the speaker
diaphragm . In addition, since the polyvinyl alcohol fiber having boron is present in the region M
where the mica exists in the first layer 1A, it is possible to prevent the other fibers such as the
second layer 1B from dropping off from the region M. Can.
[0072]
In addition, a smooth surface is formed on the first layer 1A, and the generation of fuzzing by
other fibers can be suppressed. Since the polyvinyl alcohol fiber having boron is present in the
region M in the first layer 1A, fuzzing by other fibers can be suppressed at the boundary between
the region P where mica does not exist and the region M where mica exists, It is possible to
prevent the boundary between the area M and the area P from being obscured by covering the
mica with other fibers. Further, by suppressing fuzzing of other fibers, the area P where mica
does not exist and the area M where mica exists can be clearly distinguished, and the gloss of the
area where mica exists can be expressed with high contrast, so for speakers The design of the
diaphragm can be improved. In addition, with the surface which has smoothness, the surface
which the polyvinyl-alcohol-type fiber which has boron melt | dissolves, for example, becomes a
film form, the polyvinyl-alcohol-type fiber which has the boron which comprises one layer, or
another fiber is a speaker. It includes a nearly smooth surface such as a surface formed by falling
down along the surface of the diaphragm.
[0073]
In addition, the surface having smoothness may be formed on the entire first layer 1A. In this
case, the polyvinyl alcohol fiber having boron covers the mica. Moreover, the surface which has
smoothness may be formed only in the area | region P in which mica does not exist. In this case,
a plurality of convex portions are formed in the first layer 1A due to the presence of mica.
[0074]
In addition, polyvinyl alcohol fibers having boron may be deposited in the region P to prevent
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23
fluff and other fibers from being covered with mica. In addition, by depositing polyvinyl alcohol
fibers having boron in the region P where the mica does not exist in the first layer 1A, it is
possible to suppress the detachment of other fibers such as the second layer 1B from the region
P. It does not matter.
[0075]
When the first layer 1A is composed of polyvinyl alcohol fiber having mica and boron and other
fibers, the Young's modulus of the speaker diaphragm can be made to a desired size by
appropriately adjusting the content of the mica. can do. When mica is used only for the first layer
1A, the weight of the speaker diaphragm due to the use of mica can be reduced by not using
mica for other layers, and the sound pressure of the speaker device can be reduced. It can be
improved.
[0076]
FIG. 9 is an explanatory view showing a speaker device provided with the speaker diaphragm
according to the embodiment of the present invention, and shows a cross-sectional structural
view of the entire speaker device.
[0077]
The speaker device 100 includes a vibration system member 100A including a speaker
diaphragm and a stationary member 100B relatively stationary with respect to the vibration of
the vibration system member.
The stationary member 100B supports the vibration system member 100A. The vibration system
member 100 </ b> A includes the speaker diaphragm 1 and a voice coil 101 that vibrates the
diaphragm 1. The stationary member 100B includes a frame 103 to which the magnetic circuit
102 and the vibration system member 100A are attached.
[0078]
In the illustrated example, the voice coil 101 is supported by a voice coil support (voice coil
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bobbin) 104, the voice coil support 104 is connected to the inner periphery of the speaker
diaphragm 1, and the outer periphery of the speaker diaphragm 1 is It is attached to the frame
103 through the speaker edge 105. In addition, the voice coil support portion 104 is vibratably
supported by the frame 106 by the damper 106.
[0079]
The magnetic circuit 102 includes a magnet 102A, a yoke 102B, and a plate 102C, and a
magnetic gap 102G is formed between the plate 102C and the yoke 102B. The voice coil 101
supported by the voice coil support portion 104 is disposed in the magnetic gap 102G. The top
of the voice coil support portion 104 is covered with a center cap 107. Both ends of the voice
coil 101 are connected to terminal portions to which an audio signal is input through lead wires
(not shown). In addition, the terminal portion is electrically connected to the outside.
[0080]
Examples of the magnet 102A of the magnetic circuit 102 include rare earth magnets, ferrite
magnets, alnico magnets, and the like. The driving force of the voice coil 101 is relatively small
because the magnetic force of the ferrite magnet having the same weight as the rare earth
magnet and the alnico magnet is relatively low with respect to the magnetic force of the rare
earth magnet. Therefore, in the case of using a ferrite magnet or an alnico magnet, the weight of
the vibrating body such as the speaker diaphragm 1, the voice coil 101, and the voice coil
support portion 104 is reduced, and the vibrating body is relatively small in driving force. To
provide good acoustical properties. Therefore, by using the speaker diaphragm 1 of the present
embodiment, the weight of the vibrator can be reduced, and good acoustic characteristics can be
obtained even with a relatively small driving force.
[0081]
FIG. 10 is an explanatory view showing an electronic device, an automobile, and a building on
which the speaker device provided with the speaker diaphragm according to the embodiment of
the present invention is mounted. The speaker device 100 according to the embodiment of the
present invention can be suitably mounted in an electronic device 200 as shown in the figure, a
car 300, and a building 400 such as a house.
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[0082]
As an electronic device 200 as shown in FIG. 10A, a speaker 100 can be used in a small
electronic device such as a mobile phone or a portable information terminal, or an electronic
device such as a flat panel display or an audio device. Can be mounted. As an automobile 300 as
shown in FIG. 10B, the speaker device 100 can be mounted on the rear, the front, the door, the
ceiling, etc. of the vehicle interior. As a building 400 as shown in FIG. 10C, the speaker device
100 can be mounted on an inner wall, a ceiling, a floor, an outer wall, and the like.
[0083]
Although the embodiments of the present invention have been described in detail with reference
to the drawings, the specific configuration is not limited to these embodiments, and changes in
design etc. within the scope of the present invention are not limited. Are included in the present
invention. The embodiments shown in the above-mentioned drawings can be combined with each
other unless there is any contradiction or problem in the purpose, configuration and the like.
Further, the contents of the respective drawings may be independent embodiments, and the
embodiment of the present invention is not limited to one embodiment combining the respective
drawings.
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