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JPWO2017046874

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DESCRIPTION JPWO2017046874
Abstract: A speaker diaphragm from which good acoustic characteristics can be obtained, a
speaker device provided with such a speaker diaphragm, or a fiber entangled body (21) for
providing a moving body provided with such a speaker device, and a fiber entangled body (21) A
diaphragm for a speaker, comprising: a resin film (25) formed on the surface; and the resin film
(25) comprising a resin, a plurality of spheres, and a plurality of polyhedrons.
Loudspeaker diaphragm, speaker device, and movable body
[0001]
The present invention relates to a loudspeaker diaphragm, a loudspeaker apparatus including the
loudspeaker diaphragm, and a movable body including the loudspeaker apparatus.
[0002]
Patent Document 1 describes a diaphragm in which a thermoplastic resin film layer is provided
on the surface of a diaphragm base mainly made of natural fibers, chemical fibers, inorganic
fibers and the like.
[0003]
However, after providing the film layer on the diaphragm substrate, there is a problem in that the
film layer adheres poorly to the fiber entangled body (for example, generation of wrinkles or the
like in the film layer).
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1
For this reason, it is difficult to obtain good acoustic characteristics using a diaphragm provided
with a film layer.
[0004]
Unexamined-Japanese-Patent No. 03-150000
[0005]
An object of the present invention is to provide a speaker diaphragm in which good acoustic
characteristics can be obtained, a speaker device provided with such a speaker diaphragm, or a
movable body provided with such a speaker device as an example. Be
[0006]
In order to solve the above problems and achieve the object, the speaker diaphragm of the
present invention comprises a fiber entangled body and a resin film formed on the surface of the
fiber entangled body as described in claim 1, The resin film includes a resin, a plurality of
spheres, and a plurality of polyhedrons.
[0007]
It is a figure which shows the example of the speaker apparatus provided with an example of the
diaphragm for speakers of this invention.
It is a model figure which showed the cross section of the diaphragm for speakers of FIG. 1 in an
image manner.
FIG. 1 is a model perspective view of an example of polyhedral powder that can be used in the
present invention.
FIG. 4A is an enlarged photograph of a cross section of an example of a fiber entangled body
used in the speaker diaphragm of the present invention.
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FIG. 4 (b) is an enlarged photograph of the surface of the resin film of an example of the speaker
diaphragm of the present invention. FIG. 4C is an enlarged photograph of the surface of the resin
film of an example of the speaker diaphragm of the present invention in which the enlargement
ratio is increased.
[0008]
Hereinafter, a speaker diaphragm according to an embodiment of the present invention will be
described.
[0009]
A speaker diaphragm according to an embodiment of the present invention includes a fiber
entangled body, and a resin film formed on the surface of the fiber entangled body, wherein the
resin film includes a resin, a plurality of spheres, and a plurality of spheres. And a polyhedron.
[0010]
With such a configuration, since the resin film is formed along the surface shape of the fiber
entangled body, the waterproofness of the speaker diaphragm can be improved.
In addition, the polyhedron partially enters the gap between the two spheres, and the gap
between the two spheres is partially filled, so that the permeation of the resin into the inside of
the fiber entangled body can be suppressed.
The spheres partially enter the gap between the two polyhedrons, and the gap between the two
polyhedrons is partially filled, so that the penetration of the resin into the interior of the fiber
entangled body can be suppressed.
[0011]
A plurality of holes may be formed in the resin film. With such a configuration, generation of
temporal change (for example, deformation) due to residual strain or the like in the resin film is
suppressed, and after the resin film is formed on the surface of the fiber entangled body,
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wrinkles etc. are newly generated in the resin film. Can be deterred. In addition, the Young's
modulus of the resin film can be reduced.
[0012]
In addition, the polyhedron can be formed of a resin. According to this configuration, the weight
of the speaker diaphragm can be reduced by using a polyhedron having a relatively small weight.
[0013]
In addition, the polyhedron may have at least one of a triangle, a trapezoid and a pentagon. This
configuration makes it easier for the polyhedron to partially enter the gap formed between the
two spheres. Alternatively, other polyhedrons may easily partially enter the gap between the two
polyhedrons. For this reason, spheres or polyhedrons can be adhered to the surface of the fiber
entangled body with a relatively small amount of resin, and the spheres or polyhedrons can be
prevented from coming off the fiber entangled body. Also, the resin can cover the spheres or
polyhedrons and form a resin film on the entire surface of the fiber entangled body. As described
above, the speaker diaphragm can provide high waterproofness.
[0014]
Further, the air resistance can be set to be 150 seconds or more and 210 seconds or less.
According to this configuration, it is possible to suppress the entry of water into the inside of the
fiber entangled body of the speaker diaphragm. In addition, it is possible to obtain more
appropriate acoustic characteristics in which no sound leakage is suppressed.
[0015]
Moreover, the average length of the fiber of a fiber entangled body can be 2 mm or more and 6
mm or less. With this configuration, the areal density and air permeability of the fiber entangled
body become higher. In addition, the size of the pores of the fiber entangled body can be
reduced, and the porosity can be reduced. The Young's modulus and internal loss of the speaker
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diaphragm can be adjusted in a well-balanced manner.
[0016]
In addition, since the size of the pores of the fiber entangled body is reduced, the size of the
pores in the resin film can be reduced or the number of pores can be reduced. Further, since the
size of the pores of the fiber entangled body is reduced, for example, the surface tension of the
coating liquid forming the resin film forms the resin film so as to cover one hole on the surface of
the fiber entangled body. Since such a resin film blocks a plurality of holes on the surface or
inside of the fiber entangled body and is formed on the entire surface of the fiber entangled
body, the air permeability of the speaker diaphragm and the waterproofness are improved. It can
be done.
[0017]
In addition, since the size of the hole of the fiber entangled body is reduced, spheres,
polyhedrons, etc. are buried or closed in the hole in the surface of the fiber entangled body, and
the air permeability and waterproofness of the speaker diaphragm are improved. . In addition,
the spheres, polyhedrons, etc. are buried or closed in the holes in the surface or inside of the
small size fiber entangled body, and the coating liquid used when forming the resin film is
applied to the surface of the fiber entangled body Also, penetration of the coating film into the
interior of the fiber entangled body or penetration of the back surface of the fiber entangled
body can be suppressed.
[0018]
The back surface of the speaker diaphragm may be formed of only a plurality of fibers forming a
fiber entangled body. Thereby, the internal loss of the speaker diaphragm can be improved.
Therefore, the balance of the Young's modulus and internal loss of the speaker diaphragm can be
secured, and good acoustic characteristics of the speaker device can be obtained.
[0019]
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The speaker device according to the present invention includes a frame, a diaphragm, a voice
coil, and a magnetic circuit, and the diaphragm is the diaphragm for a speaker according to any
one of the above. From this configuration, the speaker device can be made waterproof.
[0020]
A mobile according to the present invention is a mobile including the above-described speaker
device. Even if such a speaker device is attached to a door or the like of a moving object, the
speaker device can be stably used for a long time, and a moving object having good acoustic
characteristics can be obtained.
[0021]
A speaker device 1 according to an embodiment of the present invention will be described with
reference to FIG.
[0022]
FIG. 1 shows a model cross-sectional view of a speaker device provided with an example of the
speaker diaphragm of the present invention.
[0023]
The speaker device 1 includes a speaker diaphragm 8, a center cap 9, an edge 6, a frame 11, a
damper 7, a voice coil 5, a voice coil support 2, a yoke 12, a magnet 3 and a plate 4. Between the
yoke 12 and the magnetic gap 10 is formed.
[0024]
Among these, the yoke 12, the magnet 3, the plate 4 and the magnetic gap 10 constitute a
magnetic circuit.
[0025]
A voice coil 5 formed by winding a wire of a predetermined length is disposed in the magnetic
gap 10.
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An audio signal is input to the voice coil 5 from the outside.
The voice coil 5 is connected by a cylindrical voice coil support 2.
Further, the voice coil support portion 2 is connected to the frame 11 via the damper 7 so that it
can move back and forth in the axial direction (vertical direction in the figure).
An upper end portion of the voice coil support portion 2 is connected to an inner peripheral
portion of a speaker diaphragm (an example of the speaker diaphragm of the present invention)
8. Furthermore, a center cap 9 is provided on the upper side (acoustic radiation side) of the inner
peripheral portion of the speaker diaphragm 8.
[0026]
The speaker diaphragm 8 is connected to the frame 11 via an edge 6 connecting the outer
periphery of the speaker diaphragm 8 and the frame 11. The bending rigidity of the speaker
diaphragm 8 is higher than the bending rigidity of the edge 6, which makes it possible to obtain
appropriate acoustic characteristics.
[0027]
A model cross-sectional view of the speaker diaphragm 8 is shown in FIG. In this example, the
fiber entangled body 21 formed by intertwining the fibers 21 a and the resin film 25 formed on
the surface of the fiber entangled body 21 is provided, and the resin film 25 includes a resin 26
and a plurality of spheres 23. And a plurality of polyhedrons 24. In this example, polyhedron 24
has polyhedron 24 a, polyhedron 24 b dispersed in resin film 25 having a different shape from
polyhedron 24 a, and inorganic filler 22 scattered in resin film 25. A plurality of holes 27 are
formed in the resin film 25. The holes 27 communicate with holes on the surface or inside of the
fiber entangled body 21.
[0028]
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In FIG. 2, the polyhedrons 24 a and 24 b are partially inserted into the gap between the two
spheres 23. Also, a state is shown in which the spheres 23 partially enter the gap between the
polyhedron 24a and the polyhedron 24b. In addition, the spherical body 23 may partially enter
the gap between the polyhedrons 24 a and 24 a without being limited to the illustrated example.
[0029]
The spheres 23 may enter between two or more fibers 21 a forming a hole in the surface or
inside of the fiber entangled body 21, and the spheres 23 intermingle between the fibers 21 a, so
that fiber entanglement is caused. The holes of the body 21 are closed by the spheres 23, and
high waterproofness can be imparted to the speaker diaphragm. In addition, by using a hollow
sphere 23, the weight of the speaker diaphragm can be reduced. The pores on the surface or
inside of the fiber entangled body 21 may be closed not only by the spheres 23 but also by the
spheres 23 and the resin 26.
[0030]
Such a sphere 23 can be made of an inorganic material or an organic material. Here, examples of
the inorganic material constituting the spheres 23 include glass, various ceramics, and the like,
and the inorganic spheres include glass beads (including shirasu balloons). )It has been known.
On the other hand, various common resins may be mentioned as the organic material, and among
these, those having good adhesiveness with the resin constituting the resin film 25 described
later, for example, the resin constituting the resin film 25 is an acrylic resin ( In the case of
containing an acrylic urethane resin, it is preferable to select acrylic resin beads and the like.
[0031]
If the sphere 23 has an average diameter of 60 μm to 80 μm, as described above, the hole in
the surface of the fiber entangled body is closed or buried in the hole to improve the air
permeability of the speaker diaphragm Can improve the waterproofness. Here, the average
diameter of the spheres 23 is an average value of values measured by magnifying and observing
a plurality of spheres from the front of the speaker diaphragm.
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[0032]
The sphere 23 is a sphere, an ellipsoid or the like having a closed curved surface as a surface,
and also includes a sphere having a deformed surface.
[0033]
On the other hand, the resin film has the polyhedron 24.
[0034]
The polyhedron 24 is formed of an inorganic material such as glass or an organic material such
as resin.
A plurality of polyhedrons 24 are scattered in the resin film 25 as powder.
In addition, you may use the inorganic filler mentioned later as the polyhedron 24. FIG.
[0035]
The polyhedron 24 may penetrate between two or more fibers 21 a forming a hole in the surface
or inside of the fiber entangled body 21, and the polyhedron 24 intervades between the fibers 21
a to cause fiber entanglement. The hole of the body 21 is closed by the polyhedron 24 so that
high waterproofness can be imparted to the speaker diaphragm. The pores on the surface or
inside of the fiber entangled body 21 may be closed not only by the polyhedron 24 but also by
the polyhedron 24 and the resin 26 or may be closed by the polyhedron 24, the spheres 23 and
the resin 26. Absent.
[0036]
In addition, since the polyhedron 24 is dispersed in the resin film 25, irregularities are formed on
the surface of the speaker diaphragm 8 to express water repellency.
[0037]
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9
The size of the polyhedron is its average diameter (the average diameter of the spheres
circumscribing the powder, respectively).
Measured as well as the average diameter of the spheres. The hole in the surface of the fiber
entangled body is closed or buried in the hole of 60 μm or more and 80 μm or less, the air
permeability of the speaker diaphragm can be improved, and the waterproofness can be
improved. Here, the maximum length of the average of polyhedrons is an average value of values
measured by observing a plurality of polyhedrons from the front.
[0038]
It is preferable that the polyhedron has at least one of a triangle, a trapezoid and a pentagon, as
this can provide higher waterproofness. That is, in the case of having at least one of a triangle, a
trapezoid and a pentagon, it is possible that the boundary between two adjacent faces
constituting a polygon and the vicinity thereof easily enter between the aforementioned spheres.
At that time, it is possible to further prevent the infiltration of water into the speaker diaphragm
8 from between the spheres.
[0039]
FIG. 3 shows a model perspective view of an example of a powder of a polyhedron having such
faces of at least one of triangle, trapezoid and pentagon.
[0040]
FIG. 3 (a) shows an example 24a in the form of a triangular prism whose cross section is shown
in FIG.
Further, FIG. 3B shows an example in which the extension portion 32 extending downward in the
figure is provided in the example 24a shown in FIG. 3A. The example 24a shown in FIG. 3 (a) has
a triangular surface 30, and the example shown in FIG. 3 (b) has a pentagonal surface 33,
respectively. The length of each side is not limited to these examples, and may be longer or
shorter (the same applies hereinafter).
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[0041]
While the two triangular faces 30 are parallel in the above example 24a of triangular prism
shape, FIG. 3C shows an example of a shape in which the two triangular faces 30 are not parallel.
The Further, FIG. 3 (d) shows an example in which an extension 32 is provided to extend the
example shown in FIG. 3 (c) downward in the drawing. The example shown in FIG. 3C has a
triangular surface 30 and a trapezoidal surface 31, and the example shown in FIG. 3D has a
trapezoidal surface 31 and a pentagonal surface 33.
[0042]
FIG. 3E shows another example in which two triangular faces 30 are not parallel to each other.
Further, FIG. 3 (f) shows an example 24b provided with an extension 32 which extends the
example of FIG. 3 (e) downward in the drawing (a cross section of which is shown in FIG. 2). ).
Both of these examples have a triangular surface 30 and a trapezoidal surface 31.
[0043]
FIG. 3G shows an example in which the example shown in FIG. 3E is cut at a plane 34 parallel to
the bottom and the upper portion 35 is removed. Moreover, the example which provided the
extension part 32 which extends the example shown by FIG.3 (g) in the figure downward to FIG.3
(h) is shown. Both of these examples have a trapezoidal surface 31.
[0044]
As shown above in the figures, the polyhedron used in the present invention is preferably one
having a triangular or pentagonal cross section as shown in FIG. 2 among cross sections cut at
various angles.
[0045]
As described above, when the resin film of the speaker diaphragm has the above-described
spheres or polyhedrons, it is possible to prevent the waterproofness of the speaker diaphragm
from being lowered due to the dropping of the spheres or polyhedrons.
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[0046]
In the speaker diaphragm of the present invention, when the resin film 25 has an inorganic filler
formed of a material different from that of the polyhedron 24, a speaker diaphragm having an
excellent balance between Young's modulus and internal loss can be provided. it can.
Examples of such inorganic fillers include mica, powder formed of silicon dioxide, powder formed
of titanium oxide, powder formed of aluminum, etc., or fibers such as glass fiber, carbon fiber,
etc. Be .
[0047]
Further, when the resin film 25 includes the inorganic filler, the spherical body 23, the
polyhedron 24, and the inorganic filler come into contact with each other and rub against each
other to generate friction, and this friction causes unnecessary vibration to propagate in the
speaker diaphragm 8. The internal loss of the speaker diaphragm 8 is improved by attenuation.
On the other hand, when the resin film 25 includes the inorganic filler, the Young's modulus of
the resin film 25 is increased, and the Young's modulus of the speaker diaphragm 8 is improved.
As described above, it is possible to provide the speaker diaphragm 8 having a better balance of
Young's modulus and internal loss. In addition, the coating liquid for forming the resin film 25 is
formed on the inside or the back of the fiber entangled body 21 by partially blocking the holes
formed on the surface or the inside of the fiber entangled body 21 by the spheres 23, the
polyhedron 24, and the inorganic filler. It is possible to reduce the penetration of the In addition,
the amount of resin used for the speaker diaphragm 8 can be reduced by closing the holes
formed on the surface or inside of the fiber entangled body 21 by the spheres 23, the polyhedron
24 and the inorganic filler, and the speaker diaphragm 8 can It is possible to reduce the weight.
[0048]
By dispersing powder made of aluminum and mica in the resin film 25, it is possible to improve
the appearance when the speaker diaphragm is incorporated into the speaker device.
[0049]
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The resin constituting the resin film 25 may, for example, be a urethane resin or an acrylic
urethane resin. Among these, a urethane resin or an acrylic urethane resin which enables spray
coating with a relatively high viscosity of the coating liquid is used. Is preferred.
[0050]
Here, the fibers forming the fiber entangled body 21 include wood pulp fibers such as sulfite
pulp and kraft pulp, non-wood pulp fibers such as bamboo and straw, rayon, nylon, vinylon,
polyester, acrylic, etc. Chemical fibers and synthetic fibers, animal fibers such as silk and wool,
plant fibers such as manila hemp and cotton, organic fibers composed of graphite and the like,
inorganic fibers composed of silicon carbide and the like (glass fibers, carbon fibers, ceramic
fibers And mineral fibers composed of basalt and the like.
The natural fibers here include wood pulp fibers, non-wood pulp fibers, plant fibers, animal fibers
and the like.
[0051]
It is preferable that the fiber length (average length) of the fiber which forms the fiber entangled
body 21 here is 2 mm or more and 6 mm or less.
If the fiber length is too short, either the density or the surface density of the fiber entangled
body 21 decreases, the porosity increases, and the size of the pores on the surface of the fiber
entangled body 21 increases. When the size of the hole is increased, spheres, polyhedral powder,
inorganic filler, aluminum powder or the like block the hole or it becomes difficult to be buried.
For this reason, a large number of relatively large-sized holes are formed in the resin film formed
on the surface of the fiber entangled body 21, the air permeability of the speaker diaphragm 8 is
reduced, and the waterproofness is reduced. On the other hand, when the fiber length is long, the
Young's modulus of the fiber entangled body 21 becomes large, so the Young's modulus of the
speaker diaphragm 8 becomes large. As a result, the internal loss of the speaker diaphragm 8
may be reduced, and it is difficult to ensure the balance between the Young's modulus and the
internal loss of the speaker diaphragm 8.
[0052]
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Examples of the fiber entangled body 21 used for the speaker diaphragm 8 include a fiber
entangled body obtained by a paper-making method, and a fiber entangled body (example: nonwoven fabric) obtained by a method such as a needle punch method, a water jet method, or a
flash spinning method. Be 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.
[0053]
The speaker diaphragm 8 of the present invention, for example, constitutes the resin film 25 on
the surface required to provide waterproofness of the fiber entangled body 21 used in the
speaker diaphragm, for example, the acoustic radiation side surface. A coating solution in which a
plurality of spheres 23, a plurality of polyhedrons 24 and, if necessary, an inorganic filler etc. are
dispersed is applied to a solvent in which the resin is dissolved, and then a hot air drier as
required. Or the like, or the resin can be made to undergo chemical change such as crosslinking.
The coating method may be coating with a roll, spray coating, etc. By spray coating, it becomes
easy to form a plurality of holes in the resin film 25 and the penetration of the resin into the
inside of the fiber entangled body 21 is small. It is preferable because it is possible to
[0054]
The resin film 25 is preferably a coating film formed by coating such as coating with a roll or
spray coating. The coating film has a shape along the fiber entangled body having irregularities
on the surface, and fine irregularities are also formed on the surface, so that high water
repellency can be imparted to the speaker diaphragm. Further, since the releasability is imparted
by the unevenness of the surface of the resin film 25, even when a plurality of speaker
diaphragms are stacked and stored, one speaker diaphragm can be easily taken out.
[0055]
Preferably, the resin film 25 has a plurality of holes formed therein. The size of the hole is
preferably about 10 μm to 50 μm, and as described above, when the size of the sphere 23 or
the polyhedron 24 is about 60 to 80 μm, the size of the sphere 23 or the polyhedron 24 is
10-05-2019
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larger than that of the hole, It is large enough to close the hole. Since the holes of the resin film
25 correspond to the holes of the fiber entangled body 21, if the size of the holes of the resin
film 25 is the side of the holes on the surface or inside of the fiber entangled body 21, the
spheres 23 or polyhedrons 24. Is smaller than the pores of the resin film 25 and is large enough
to close the pores of the fiber entangled body 21. In addition, when using an inorganic filler
together, the hole may be closed by these. The resin film 25 may be formed to cover the entire
surface of the fiber entangled body 21. The resin film 25 is adhered to the fibers of the fiber
entangled body 21. The resin of the resin film 25 is preferably formed only on the surface of the
fiber entangled body 21, and in the case where the resin soaks into the interior of the fiber
entangled body 21, the penetration depth is the same as that of the fiber entangled body 21. It is
preferred that the thickness be smaller. If the penetration depth is equal to, for example, the
thickness of the fiber entangled body, the Young's modulus of the fiber entangled body may be
large while the internal loss may be reduced, and appropriate acoustic characteristics may not be
obtained.
[0056]
The back surface of the speaker diaphragm 8 is formed of only a plurality of fibers forming the
fiber entangled body 21. The resin film 25 may be on the surface of the fiber entangled body 21
or inside the fiber entangled body 21, but the back surface of the speaker diaphragm 8 is formed
of only a plurality of fibers included in the fiber entangled body 21. The internal loss can be
improved by forming the back surface of the fiber entangled body with a plurality of fibers. For
this reason, the balance of the Young's modulus and internal loss of the speaker diaphragm 8 can
be ensured, and good acoustic characteristics of the speaker device can be obtained.
[0057]
Further, by forming the back surface of the speaker diaphragm 8 using only a plurality of fibers,
it can be confirmed whether the coating liquid forming the resin film 25 has penetrated to the
back surface of the fiber entangled body. This confirmation can reduce the amount of resin that
has permeated into the fiber entangled body.
[0058]
When forming the fiber entangled body and the resin film, the air resistance of the speaker
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15
diaphragm finally obtained is measured in accordance with JIS P 8117: 2009-01 (Gurley tester
method). The air permeability of the speaker diaphragm is preferably in the range of 150
seconds to 210 seconds. As the value of air permeability specifically measured, the value of air
permeability of the fiber entangled body is about 174 seconds, and the value of air permeability
of the speaker diaphragm in which the resin film is formed on the surface of the fiber entangled
body Was about 200 seconds. The measurement of air permeability includes an error, for
example, ± 6 seconds. When the air resistance of the speaker diaphragm is in this range, it is
possible to provide a speaker diaphragm having relatively high waterproofness.
[0059]
The speaker diaphragm thus obtained can have high waterproofness without sticking a film on
the surface of the fiber entangled body, but like the conventional speaker diaphragm, the frame
and the vibration can be obtained. Both the board, the voice coil, and the magnetic circuit can
constitute a speaker device, and such a speaker device is a portion of a mobile body such as an
automobile that may come into contact with water such as rain, for example, a door And the like.
[0060]
The present invention has been described above by way of the preferred embodiments, but the
speaker diaphragm, the speaker device, and the movable body of the present invention are not
limited to the configurations of the above embodiments.
[0061]
Those skilled in the art can appropriately modify the speaker diaphragm, the speaker device, and
the moving body of the present invention in accordance with conventionally known findings.
Even with such modifications, as long as the speaker diaphragm, the speaker device, and the
moving body according to the present invention are included, they are of course included in the
scope of the present invention.
[0062]
Hereinafter, specific examples of the speaker diaphragm of the present invention will be
described.
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16
[0063]
The fiber entangled body 21 constituting the speaker diaphragm has a thickness of about 6 mm,
an air resistance of 174 seconds, and an average fiber length (measured in accordance with JIS
P8226-2006).
NU 3.5mm, NUKP (non-bleached pulp made from softwood).
The freeness is 20 ° SR (according to JIS P8121-1: 2012). The fiber is beaten to obtain a cone
shape, and then it is formed by heating and pressing at 200 ° C. and 0.3 MPa. The cross section
of the acoustic emission surface of the fiber entangled body obtained in this manner is shown in
FIG. 4 (a).
[0064]
On the other hand, urethane resin was used as resin of resin film.
[0065]
The spheres are hollow beads, and the size distribution is about 60 to 80 μm.
On the other hand, the distribution of the size of the plurality of polyhedrons is 60 to 80 μm.
[0066]
The other spheres, polyhedrons, inorganic fillers and aluminum powder are dispersed in a
coating solution in which the above-mentioned resin is dissolved in a solvent to form a final resin
film thickness on the surface of the fiber entangled body (the surface on the acoustic radiation
side). It spray-coated so that it might be about 1 micrometer, and it was made to dry.
[0067]
With regard to the speaker diaphragm thus obtained, a cross-sectional photograph of the speaker
diaphragm is shown in FIG. 4 (a), and an enlarged photograph of the surface of the resin film is
shown in FIG. 4 (b). Is shown in FIG. 4 (c).
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17
[0068]
In FIG. 4A, the presence of a fiber entangled body and a resin film on the surface of the fiber
entangled body can be confirmed.
In the region extending from the surface of the speaker diaphragm to a depth of 439 μm, it can
be seen that the void in the fiber entangled body is small and the void percentage in the fiber
entangled body is relatively small.
On the other hand, in the region from the depth of 439 μm to the depth of 202 μm reaching
the back surface of the speaker diaphragm, it can be seen that the voids in the fiber entangled
body increase and the porosity in the fiber entangled body is relatively large. It is speculated that
the resin film is present only on the surface of the fiber entangled body and does not reach the
back surface of the fiber entangled body. Further, it is considered that the resin of the resin film
does not permeate into the inside of the fiber entangled body, or a small amount of resin
penetrates into the inside of the fiber entangled body.
[0069]
On the other hand, it is understood that the resin film has a plurality of holes in the photographs
of FIGS. 4 (a), (b) and (c) (a hole in the upper left portion of the photograph of FIG. 4 (c) and its
holes The fibers that make up the fiber entanglement are observed.
[0070]
Reference Signs List 1 speaker device 2 voice coil supporting portion 3 magnet 4 plate 5 voice
coil 6 edge 7 damper 8 diaphragm for speaker 9 center cap 10 magnetic gap 11 frame 12 yoke
21 a fiber 21 fiber interlacing body 22 inorganic filler 23 sphere 24 a, 24 b polyhedron 25 Resin
film 26 Resin 27 hole
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