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JPWO2014162468

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DESCRIPTION JPWO2014162468
Abstract: A speaker vibrator having a large effective vibration area, in which delamination is
prevented in advance, and a speaker device having such a speaker vibrator. A first fiber
entangled body 1A and a second fiber entangled body 1B overlapping with the first fiber
entangled body 1A, wherein one of the first fiber entangled body 1A and the second fiber
entangled body 1B is A speaker vibrator having a polyvinyl alcohol-based fiber having boron, and
an outer peripheral portion of the first fiber entangled body 1A is larger than an outer peripheral
portion of the second fiber entangled body 1B.
Speaker vibration body and speaker device
[0001]
The present invention relates to a speaker vibrating body and a speaker device having a speaker
vibrating body.
[0002]
A diaphragm having a diaphragm and an edge formed by a sheet-forming method using a single
material, that is, a vibrator having a so-called fixed edge has been proposed (Patent Document 1).
[0003]
Patent Document 1 points out the following drawbacks.
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In the fixed edge B shown in FIG. 9 of the patent document 1, the edge portion 12a is rolled up
thinner than the cone diaphragm portion 13a by the split method, and the compliance of the
edge portion 12a is obtained from the cone diaphragm portion 13a. To improve the compliance
of the edge portion 12a so as to increase the compliance, therefore, as the compliance is
enhanced, the vibration resistance becomes weak and it is made of pulp. It has the disadvantage
that compliance is easily affected by the external air environment, particularly humidity.
[0004]
That is, in the technique disclosed in Patent Document 1, since the diaphragm and the edge are
formed of the same single material, there is a problem that it is not possible to meet the
individual requirements for the diaphragm and the edge. .
[0005]
Japanese Utility Model Publication No. 05-41294
[0006]
The present invention takes the above-mentioned problems as an example of the problem.
That is, it is an object of the present invention to provide a speaker vibrating body in which
physical properties of a diaphragm and an edge are adjusted, and a speaker device having such a
speaker vibrating body.
[0007]
In order to solve the above problems, the speaker vibrator according to the present invention
includes the first and second fiber entangled bodies, and the first and second fiber entangled
bodies are provided. One of them has a polyvinyl alcohol-based fiber having boron, and the outer
peripheral portion of the first fiber entangled body is larger than the outer peripheral portion of
the second fiber entangled body.
[0008]
Further, the speaker vibrating body according to the present invention comprises a first fiber
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entangled body and a second fiber entangled body overlapping with the first fiber entangled
body, the first fiber entangled body and the second fiber entangled body One of them has a
polyvinyl alcohol-based fiber having boron, the first fiber entangled body constitutes a bending
portion, and the second fiber entangled body constitutes a vibrating portion.
[0009]
It is sectional drawing which concerns on Example 1 and 1 'of embodiment of the speaker
vibrating body of this invention.
It is sectional drawing which concerns on modification 1 '' of the speaker vibrating body of this
invention.
It is an electron micrograph which shows the cross section of the fiber bundle of the example of
the polyvinyl-alcohol-type fiber which has boron used by this invention.
It is a flowchart of the manufacturing method of Example 1 of the speaker vibrating body of this
invention.
It is a model figure showing an example 100 of the speaker apparatus concerning the present
invention. It is a model figure which shows the example of installation of the example 100 of the
speaker apparatus based on this invention, and an example of installation.
[0010]
A cross section of an example 1 of the speaker vibrating body according to the present invention
is shown as a model in FIG.
[0011]
The speaker vibrating body 1 of the present invention includes the first fiber entangled body 1A
and the second fiber entangled body 1B stacked as described above, and the first fiber entangled
body 1A or the second fiber One of the entangled bodies 1B has a polyvinyl alcohol fiber having
boron, and the outer peripheral portion of the first fiber entangled body 1A is larger than the
outer peripheral portion of the second fiber entangled body.
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[0012]
The speaker vibrating body 1 of the present invention has a vibrating surface 2, and when it is
incorporated into a speaker device, a sound wave is emitted from the vibrating surface 2.
[0013]
As shown in FIG. 1A, in the case where the first fiber interlacing body 1A is provided on the front
surface side of the speaker vibrating body 1 and the second fiber interlacing body 1B is provided
on the back surface side, the first The fiber entangled body 1A of the present embodiment
constitutes the vibration surface of the speaker vibrator 2.
[0014]
Further, as in Example 1 ′ of the speaker vibrating body according to the present invention
shown in FIG. 1B, the first fiber entangled body 1A is provided on the back surface side of the
speaker vibrating body 1 ′, and the second fiber entangled When the body 1B is provided on
the surface side, the second fiber entangled body 1B constitutes a vibration surface of the
speaker vibrating body.
[0015]
The speaker vibrating body of the present invention includes a vibrating portion 2 having a
vibrating surface and a bending portion 3 having a vibrating surface.
When the speaker vibrating body is incorporated into the speaker device, sound waves are
emitted from the vibrating surfaces of the vibrating portion 2 and the bending portion 3.
Therefore, the speaker device in which the speaker vibrating body is incorporated has a relatively
large effective vibration area.
[0016]
The first fiber entangled body constitutes a part of the vibrating part and a bending part.
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[0017]
The second fiber entangled body constitutes a part of the vibrating portion.
[0018]
The outer peripheral portion of the first fiber entangled body is formed larger than the outer
peripheral portion of the second fiber entangled body.
The inner circumferential portion of the first fiber entangled body is formed smaller than the
outer circumferential portion of the second fiber entangled body.
Further, the inner circumferential portion of the first fiber entangled body is formed substantially
the same as or smaller than the inner circumferential portion of the second fiber entangled body.
[0019]
That is, the first fiber entangled body forms a common portion of the vibrating portion and the
bending portion.
[0020]
The vibrating part comprises two layers.
Of the two layers, one layer is composed of the first fiber entangled body, and the other layer is
composed of the second fiber entangled body.
The vibrating portion can be in the shape of a known diaphragm such as a cone shape or a flat
plate shape.
[0021]
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The bend is constituted by the first fiber entangled body.
The bent portion may adopt a known edge shape such as a corrugation shape or a bent shape.
[0022]
The vibrating portion may have a large rigidity (Young's modulus) with respect to the bending
portion.
In this case, the propagation speed of the sound wave emitted from the vibration unit can be
improved.
[0023]
The rigidity can be increased by forming the vibrating portion in a laminated structure of the
first fiber entangled body and the second fiber entangled body. Further, by increasing the rigidity
of the second fiber entangled body with respect to the first fiber entangled body, the rigidity of
the vibrating portion can be increased. Specifically, for example, increasing the density of the
second fiber entangled body with respect to the density of the first fiber entangled body, or
constructing the second fiber entangled body with fibers having a relatively large rigidity, Etc.
Fibers having relatively large stiffness include, for example, fibers having relatively large Young's
modulus, relatively long fibers, and the like. As a fiber with a comparatively large Young's
modulus, the polyvinyl-alcohol-type fiber which has the boron mentioned later, for example is
mentioned. Also, the relatively long fiber length provides the fiber with relatively high bending
stiffness.
[0024]
The bending portion may have a smaller rigidity (Young's modulus) than the vibrating portion. In
this case, the vibration unit can be favorably instructed to a frame included in a speaker device
described later.
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[0025]
By making the bending portion into a single layer formed of, for example, the first fiber
entangled body, the rigidity can be reduced with respect to the vibrating portion having a layer
formed of the first fiber interlaced body it can. Moreover, rigidity can be made small by making
relatively low the density of the 2nd fiber entangled body which comprises a bending part. By
thus reducing the rigidity of the bent portion, the followability of the vibration of the vibrating
portion is improved. For this reason, the vibration unit can vibrate faithfully to the electric signal
input to the voice coil.
[0026]
When the speaker device (described later) including the speaker vibrating body of the present
invention is driven, the bending portion repeats the bending motion to support the vibration
portion with respect to the frame of the speaker device. For this reason, stress may continue to
act at the boundary between the bending portion and the vibrating portion, which may cause
breakage or the like. Therefore, in the first fiber entangled body that constitutes the bending
portion and the vibrating portion, the occurrence of such a break can be suppressed by making
the length of the fiber relatively long.
[0027]
The fiber length of the first fiber entangled body may be, for example, longer than the fiber
length of the second fiber entangled body.
[0028]
Among the first fiber entangled body and the second fiber entangled body constituting the
speaker vibrating body of the present invention, one fiber entangled body has a polyvinyl
alcohol-based fiber having boron.
[0029]
The vibrating portion of the speaker diaphragm has a structure in which the first fiber entangled
body and the second fiber entangled body are stacked.
[0030]
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When forming such a laminated structure, the first fiber entangled body as a paper-formed
product formed by paper-making and the second fiber entangled body as a paper-formed product
are individually overlapped, and those overlapped are held The laminated structure is formed by
heating and pressing using two molds.
In this case, since the adhesion between the first fiber entangled body and the second fiber
entangled body is low, the first fiber entangled body and the second fiber entangled body may be
peeled off after heating and pressing. is there.
Then, this peeling can be suppressed because one of the first fiber entangled body and the
second fiber entangled body has a polyvinyl alcohol-based fiber having boron.
If polyvinyl alcohol fibers soluble in hot water at about 60 ° C. are used, the polyvinyl alcohol
fibers adhere to the mold, and the first fiber entangled body and the second fiber entangled body
are made of gold. It may be difficult to peel off the mold, which may reduce productivity. In the
present invention, by using a polyvinyl alcohol fiber having boron, the mold releasability can be
improved and the productivity can be improved.
[0031]
In the speaker vibrating body according to the embodiment of the present invention, fibers
selected from natural fibers, regenerated fibers, chemical fibers, synthetic fibers, organic fibers,
and inorganic fibers may be used singly or in combination of two or more. it can.
[0032]
Natural fibers include wood pulp fibers, non-wood pulp fibers, vegetable fibers, animal fibers and
the like.
Examples of wood pulp fibers include sulfite pulp and kraft pulp. Non-wood pulp fibers include
bamboo and straw. Examples of plant fibers include Manila hemp and cotton. Animal fibers
include silk and wool. Chemical fibers and synthetic fibers include fibers composed of rayon,
nylon, vinylon, polyester, acrylic and the like. Examples of organic fibers include fibers composed
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of graphite and the like. Examples of inorganic fibers include inorganic fibers composed of silicon
carbide and the like, and mineral fibers composed of glass fiber, carbon fiber, ceramic fiber,
basalt and the like.
[0033]
Here, as a synthetic fiber used for a fiber entangled body of a speaker vibrating body, a polyvinyl
alcohol fiber having boron can be mentioned. When a polyvinyl alcohol fiber soluble in hot water
at 60 ° C. is used as a fiber entangled body of a speaker vibrating body, when drying a papermade body (for example, a fiber entangled body containing water) after paper making, Water is
converted to hot water by the mold used for drying, and polyvinyl alcohol fibers are dissolved in
this hot water and adhere to the mold, making it difficult to peel off the dried sheet from the
mold and reducing productivity. There was a problem. However, by using a polyvinyl alcoholbased fiber having boron, the mold releasability can be improved and the productivity can be
improved.
[0034]
Further, as the polyvinyl alcohol-based fiber having boron, a fiber composed of a composition
comprising a polyvinyl alcohol-based polymer compound having boric acid or a boroncrosslinked polyvinyl alcohol known in Patent Documents 4 and 5 The fiber etc. which were
comprised from a system polymer compound are mentioned. Here, Formula (1) and Formula (2)
show the structures of boron cross-linked portions in two examples of the boron-crosslinked
polyvinyl alcohol-based polymer compound. Further, another example of the boron-crosslinked
polyvinyl alcohol-based polymer compound is shown in the formula (3).
[0035]
<img class = "EMIRef" id = "456840618-00003" />
[0036]
<img class = "EMIRef" id = "456840618-00004" />
[0037]
<img class = "EMIRef" id = "456840618-000005" />
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[0038]
The polyvinyl alcohol-based polymer compound having a boron crosslink is, for example, one
obtained by forming a crosslink structure with boron 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,
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. .
[0039]
In addition, as the compounding amount of the first fiber entangled body constituting the
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speaker vibrating body, for example, the compounding amount of polyvinyl alcohol fiber having
boron is 30% by weight, and other fibers other than polyvinyl alcohol fiber (for example, The
blending amount of natural fibers is 70% by weight. In addition, as the compounding amount of
the fibers of the second fiber entangled body constituting the speaker vibrating body, for
example, the compounding amount of the polyvinyl alcohol-based fiber having boron is 10% by
weight, and other fibers (for example, natural fibers) The compounding amount is 90% by weight.
[0040]
In the first fiber entangled body, it is preferable to make the blending amount of the polyvinyl
alcohol fiber having boron relatively small in order to make the rigidity relatively small.
Therefore, it is preferable that the compounding quantity of the polyvinyl-alcohol-type fiber
which has boron is small with respect to the compounding quantity of other fiber.
[0041]
In the second fiber entangled body, in order to relatively increase the rigidity, it is preferable to
relatively increase the blending amount of the polyvinyl alcohol fiber having boron. On the other
hand, it is preferable that the blending amount of the polyvinyl alcohol fiber having boron is
smaller than the blending amount of the other fibers in that the rigidity does not become
excessively large.
[0042]
The dissolution temperature in water of the polyvinyl alcohol-based fiber having the abovementioned boron is higher than 80 ° C. When such a fiber is used to form a speaker diaphragm
using a mold, the fibers dissolve in hot water and adhere to the mold, and the fibers adhere to the
mold to lower productivity. You can prevent it from happening.
[0043]
Furthermore, if the polyvinyl alcohol-based fiber having boron described above is a crimped
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fiber, the entanglement points of the fibers increase, so that the fibers can easily be caused to
friction, and the internal loss of the speaker diaphragm can be improved. Can. In addition, since
the number of intertwining fibers increases, the Young's modulus of the speaker diaphragm can
be improved.
[0044]
In addition, when the cross-sectional shape of the intertwining fiber is circular or elliptical,
cracking of the fiber (for example, cracking in the radial direction) can be suppressed in advance.
The electron micrograph which shows the cross section of the fiber bundle of the example of the
polyvinyl-alcohol-type fiber which has boron used by FIG. 2 by this invention is shown.
[0045]
In the above embodiment, the first fiber entangled body constitutes a part of the vibrating part
and the bending part, and the second fiber entangled body constitutes a part of the vibrating
part. The outer peripheral portion of the first fiber entangled body is formed larger than the
outer peripheral portion of the second fiber interlaced body, and the inner peripheral portion of
the first fiber interlaced body is formed smaller than the outer peripheral portion of the second
fiber interlaced body . In the present invention, the present invention is not limited to such a
configuration, and for example, as shown in FIG. The vibrating portion may be configured of the
second fiber entangled body. In this case, the outer peripheral portion of the first fiber interlaced
body 1A is formed larger than the outer peripheral portion of the second fiber interlaced body
1B, and the inner peripheral portion of the first fiber interlaced body 1A is the outer periphery of
the second fiber interlaced body 1B. It is smaller than the part.
[0046]
Further, the inner circumferential portion of the first fiber entangled body 1A is formed larger
than the inner circumferential portion of the second fiber entangled body 1B. The inner
peripheral portion of the bending portion 3 formed of the first fiber entangled body 1A overlaps
the outer peripheral portion of the vibrating portion 2 formed of the second fiber interlacing
body 1B. Are linked. Therefore, the speaker vibrator includes an overlapping portion in which the
first fiber entangled body 1A and the second fiber entangled body 1B overlap. In the illustrated
example, in the overlapping portion 1C, the first fiber entangled body 1A is on the front surface
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side of the speaker vibrating body, and the second fiber entangled body 1B is on the back surface
side of the speaker vibrating body. In addition, the second fiber entangled body 2B may be on the
front surface side of the speaker vibrating body, and the first fiber entangled body 1A may be on
the back surface side of the speaker vibrating body. In this overlapping portion, a portion of the
first fiber entangled body 1A or a portion of the second fiber entangled body 1B has the
polyvinyl alcohol fiber having boron described above. Each of the first fiber entangled body 1A
and the second fiber entangled body 1B is provided with a vibrating surface.
[0047]
By providing the speaker vibrating body with such a configuration, the bending portion is
substantially formed of the first fiber entangled body, and the vibrating portion is substantially
formed of the second fiber entangled body. For example, when the Young's modulus of the first
fiber entangled body is smaller than that of the second fiber entangled body in order to make the
bent portion flexible, the second fiber entangled body is laminated on the first fiber entangled
body Since there is not, the bending portion has a desired flexibility to improve the followability
to the vibration of the vibrating portion. In other words, when the Young's modulus of the second
fiber entangled body is larger than that of the first fiber entangled body, the first fiber entangled
body is not laminated to the second fiber entangled body, so the vibrating portion is bent. It can
have a relatively higher Young's modulus than that of the part to improve the propagation speed.
Moreover, weight reduction of the speaker vibrating body can be achieved by using the
laminated portion as the connection portion of the vibrating portion and the bending portion. On
the other hand, in order to connect the bending portion and the vibrating portion, one fiber
entangled body of the bending portion or the vibrating portion may have a polyvinyl alcohol
fiber having boron, and at the same time, the Young's modulus of the vibrating portion is
improved. In order to cause this, the second fiber entangled body constituting the vibrating
portion may have a polyvinyl alcohol-based fiber having boron.
[0048]
FIG. 4 shows a flowchart of the manufacturing method of the speaker diaphragm 1 ′ ′ shown
in FIG. 1A as an example of the manufacturing method of the speaker vibrating body according
to the present invention.
[0049]
In step S1-1, the first component, that is, the first fiber entangled body, which is a paper-made
product having a bending portion, is formed by a paper-making method using pulp, and
simultaneously with this step S1-1 or before or after that. In step S2-1, a first fiber entangled
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body which is a paper-made product having no bent portion as a second component member is
formed by a paper-making method using polyvinyl alcohol-based fibers having boron and pulp.
[0050]
Next, these fiber entangled bodies are superposed in step S3-1, and integrated by heating and
pressing in step S4-1 which is a forming process.
[0051]
FIG. 5 shows an example 100a of a speaker apparatus provided with such a speaker vibrating
body according to the present invention.
[0052]
The speaker device 100a includes the frame 103, the speaker vibrating body 1 according to the
present invention including the vibrating portion 1a and the bending portion 1b, the center cap
107, the bending portion 105, the speaker lead wire (twisted wire) 200, the damper 106, and the
voice A coil support unit 104, a voice coil 101 supported by a voice coil support unit, and a
magnetic circuit 102 are provided.
The magnetic circuit 102 includes a magnetic gap 102G in which the magnet 102A, the yoke
102B, the plate 102C, and the voice coil 101b are disposed.
[0053]
In this speaker device 100a, the speaker lead wire 200, which is an audio signal supply line for
supplying an audio signal to the voice coil 101, is connected between the front and back surfaces
of the speaker diaphragm 1a with the vibrating portion 1a of the speaker vibrating body. It is
arranged by sewing.
[0054]
The vibrating portion 1a is supported by the frame 103 by the bending portion 1b.
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The outer peripheral portion 105 a of the bent portion 1 b is connected to the frame 103.
The vibrating portion 1a, the bending portion 105, and the center cap 107 form a vibrating
surface that emits a sound wave.
[0055]
FIG. 6 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 or installed.
The speaker device 100 according to the embodiment of the present invention can be suitably
installed in an electronic device 200 as shown in the figure, an automobile 300, or can be
suitably installed in a building 400 such as a house.
[0056]
As an electronic device 200 as shown in FIG. 6A, a speaker 100 can be used in a case of 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. 6B, 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. 6C,
the speaker device 100 can be installed in an inner wall portion, a ceiling portion, a floor portion,
an outer wall portion or the like.
[0057]
As mentioned above, although this invention was mentioned and described a preferable
embodiment, the speaker vibrating body and the speaker apparatus of this invention are not
limited to the structure of the said embodiment.
[0058]
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Those skilled in the art can appropriately modify the speaker vibrating body and the speaker
device of the present invention in accordance with conventionally known findings.
As long as the speaker vibrating body of the present invention and the configuration of the
speaker device of the present invention are provided even after such a modification, it is of
course included in the scope of the present invention.
[0059]
100 Example 1 of speaker device according to the present invention speaker vibrating body 1a
vibrating portion 1b of speaker vibrating body bent portion 1A of speaker vibrating body first
fiber interlacing body 1B second fiber interlacing body 101 voice coil 102 magnetic circuit 102A
permanent magnet 102B, 102C ball piece 102G gap portion 103 frame 104 cylindrical portion
105 edge 106 damper 107 center cap 200 speaker lead wire
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