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JP2016051991

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DESCRIPTION JP2016051991
Abstract: To provide a speaker diaphragm having waterproofness, and a speaker device provided
with such a speaker diaphragm. A fiber entangled body and a plurality of particles attached to
the fiber entangled body, wherein the plurality of particles are formed of inorganic particles
formed of an inorganic material and a resin attached to the inorganic particles Speaker
diaphragm. [Selected figure] Figure 1
Speaker diaphragm and speaker device
[0001]
The present invention relates to a speaker diaphragm and a speaker device provided with such a
speaker diaphragm.
[0002]
Loudspeaker diaphragms are generally manufactured by making natural fibers such as pulp.
[0003]
In the technology described in Patent Document 1, another material is produced by forming a
diaphragm for a speaker by making a material including a material having an enhanced freeness,
carbonized bamboo fiber finely divided to a microfibrillar state, and paper-making it. As a
configuration that can improve the sound quality and improve the environmental response by
improving the entanglement with the speaker diaphragm, giving sufficient rigidity and toughness
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to the speaker diaphragm, and achieving high rigidity and high internal loss. There is.
And, it is described in this document that mica can be additionally used as a reinforcing material,
and it is suggested that waterproofness can be imparted by using a waterproofing agent.
[0004]
One application of the speaker device is an on-vehicle application such as a car.
And when it mounts as a speaker apparatus for doors among these vehicle-mounted applications,
waterproofness is calculated | required by the part which touches external air, especially its
diaphragm from a viewpoint of reliability and performance maintenance.
[0005]
Here, when bamboo fiber (natural fiber) described in Patent Document 1 and mica as a
reinforcing material are used in combination, the adhesion between bamboo fiber and mica is
low, and the waterproofness of the diaphragm is reduced. Then, when a waterproofing agent is
used in combination to provide waterproofness, there is a problem that the internal loss or
Young's modulus of the diaphragm is reduced and the acoustic characteristics of the speaker
device are reduced.
[0006]
JP, 2011-155424, A
[0007]
The present invention takes as an example the problem to address such problems.
That is, an object of the present invention is to provide a speaker diaphragm having
waterproofness, and a speaker device provided with such a speaker diaphragm.
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[0008]
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 plurality of particles attached to the
fiber entangled body, as described in claim 1, and the plurality of particles Is characterized in
that it is formed of inorganic particles formed of an inorganic material and a resin attached to the
inorganic particles.
[0009]
According to a fifth aspect of the present invention, there is provided a loudspeaker apparatus
comprising: the loudspeaker diaphragm according to any one of claims 1 to 4; a frame for
supporting the loudspeaker diaphragm; and a voice coil. And a magnetic circuit, characterized in
that the plurality of particles are present on or near the surface of the fiber entangled body on
the acoustic radiation side.
[0010]
It is a figure which shows the example of the speaker apparatus provided with an example of the
vibration for speakers of this invention.
It is a model figure which shows the inorganic particle to which resin adhered.
FIG. 3A is a model diagram of an example in which inorganic particles to which a resin is
attached are disposed in the vicinity of the surface on the acoustic radiation side of the speaker
diaphragm incorporated in the speaker device. FIG. 3A is a model diagram of an example in
which inorganic particles to which resin is attached are disposed in the vicinity of both surfaces
of the speaker diaphragm incorporated in the speaker device. It is a photograph which shows the
result of waterproofing evaluation of the diaphragm for speakers.
[0011]
Hereinafter, embodiments of the present invention will be described.
[0012]
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A diaphragm for a speaker device according to an embodiment of the present invention includes
a fiber entangled body and a plurality of particles attached to the fiber entangled body, the
plurality of particles being inorganic particles formed of an inorganic material, and the inorganic
particle It is formed of a resin attached to the particles.
[0013]
By using the inorganic particles to which the resin adheres, the adhesion between the fibers of
the fiber entangled body and the particles is improved.
In addition, by improving the adhesion between the fibers and the particles, the size of the voids
in the fiber entangled body becomes relatively small, and it becomes difficult for water to
infiltrate.
For this reason, the waterproofness of the speaker diaphragm is improved.
[0014]
Moreover, it is preferable that said resin has a sulfone group. By having this sulfone group,
particularly when forming a fiber entangled body, the adhesion between the fiber and the resin
of the particles is improved, and the size of the void in the fiber entangled body can be made
relatively small, and waterproofing of the speaker diaphragm Sex can be further improved. In
particular, when the fiber entangled body is formed of natural fibers such as pulp, the pulp is
cationic in water and the resin of particles is anionic, so the resin of pulp and particles is more
firmly adhered by hydrogen bonding. Do.
[0015]
Moreover, it is preferable that said resin is a polystyrene which has a sulfone group. Since
polystyrene has relatively low wettability to water, the waterproofness of the speaker diaphragm
can be further improved.
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[0016]
The above-mentioned inorganic particles are preferably mica. By using mica as the inorganic
particles, the Young's modulus or internal loss of the speaker diaphragm can be improved.
[0017]
A speaker device according to the present invention comprises any of the speaker diaphragms
described above, a frame for supporting the speaker diaphragm, a voice coil, and a magnetic
circuit, and the surface or the surface of the fiber entangled body on the sound emission side In
the vicinity, there are the plurality of particles.
[0018]
This configuration can further improve the waterproofness of the speaker diaphragm.
In particular, when a speaker device is disposed at a door or front of an automobile, water may
enter the speaker device and the speaker diaphragm may get wet. In this case, as the surface on
the acoustic radiation side is waterproof, it is possible to prevent the diaphragm for the speaker
from being wetted and the Young's modulus being lowered, making it difficult to obtain desired
acoustic characteristics. In addition, it is possible to make the speaker diaphragm look glossy.
[0019]
The fiber entangled body supports the voice coil, and the plurality of particles are present on the
surface of the fiber entangled body on the voice coil side.
[0020]
This configuration can further improve the Young's modulus of the speaker diaphragm.
[0021]
Examples of the present invention will be specifically described below.
[0022]
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FIG. 1 shows a model cross-sectional view of an example of a speaker apparatus provided with an
example of the speaker vibration of the present invention.
[0023]
The speaker device A includes a speaker diaphragm 8, a center cap 9, an edge 10, a frame 11, a
magnetic circuit 13, and a damper 7.
[0024]
The magnetic circuit 13 supported by the frame 11 includes the back plate 1, the pole piece 2,
the magnet 3, and the magnetic gap G.
[0025]
A cylindrical pole piece 2 is attached to a central portion of the disk-shaped back plate 1.
Further, an annular magnet 3 is coaxially mounted on the outer periphery of the back plate 1
with the pole piece 2 and an annular plate 4 is coaxially mounted on the magnet 3 with the pole
piece 2 and has an annular shape having a predetermined width. A magnetic circuit provided
with a magnetic gap G is formed.
[0026]
The magnetic gap G is provided with a coil 5 formed by winding a wire of a predetermined
length.
An audio signal is input to the coil from the outside.
The coil 5 is supported by a cylindrical coil support 6.
The voice coil support 6 is supported by the frame 11 via the damper 7 and can vibrate back and
forth in the axial direction Y (vertical direction in the figure).
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An upper end portion of the coil support portion 6 is supported by a speaker diaphragm (an
example of the speaker diaphragm of the present invention) 8.
Furthermore, a center cap 9 is provided at the upper end of the coil support 6.
[0027]
The outer peripheral portion of the speaker diaphragm 8 is connected to the inner peripheral
portion of the edge 10, and the outer peripheral portion of the edge 10 is supported by the frame
11. A gasket 12 is provided at the upper end of the outer peripheral portion of the edge 10.
[0028]
Such a speaker diaphragm includes a fiber entangled body in which a plurality of fibers are
entangled, and a plurality of particles adhere to the fiber entangled body, and the plurality of
particles are formed of inorganic particles and inorganic particles. And the resin attached to the
inorganic particles.
[0029]
As the inorganic particles, mica, graphite and the like can be mentioned.
In particular, mica having a desired particle diameter can be selected and used as inorganic
particles, or mica having a desired particle diameter can be used as an inorganic particle and in
the voids of a fiber entangled body formed by interlacing a plurality of fibers It is preferable in
that the mica can be confined to the fiber entangled body by the entanglement of a plurality of
fibers.
[0030]
The size of the mica may be a general size used as a speaker diaphragm reinforcing material, for
example, a mesh having an opening of about 0.2 to 2 mm can be used, but the size is large. It
does not matter.
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[0031]
The inorganic particles can be, for example, those having a resin attached to the surface thereof.
This resin reduces the wettability of the particles to water, and as a result, the adhesion between
the fibers of the fiber entangled body and the particles is improved. For this reason, the space in
the fiber entangled body becomes relatively small, and the entry of water into the speaker
diaphragm is prevented, and as a result, the waterproofness of the speaker diaphragm can be
improved.
[0032]
As the resin, polystyrene, polyethylene terephthalate, or an organic substance having a siloxane
bond can be used as a resin having low wettability to water. Among them, when the resin is
polystyrene, it is particularly preferable to use pulp for the fiber, because it has high adhesion to
the pulp or fixability.
[0033]
Furthermore, it is preferable to use a cationic resin as the resin in that the affinity to natural
fibers in water (paper making slurry) can be increased. Moreover, it is preferable at the point
which can suppress generation | occurrence | production of the space | gap between the
inorganic particle in a fiber entangled body, and a natural fiber. Examples of the resin having
such a cationic property include polymer compounds having a sulfone group. As a model
chemical formula of one example of the polymer compound having such a sulfone group, one
obtained by introducing a sulfone group into polystyrene (substituting hydrogen with a sulfone
group) as shown in the chemical formula (1) can be mentioned, and more specific What is shown
to Chemical formula (2) as an example of a high molecular compound (polystyrene sulfonic acid.
Chemical formula (2) shows the ionized state. Can be mentioned.
[0034]
<img class = "EMIRef" id = "353408530-00003" />
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[0035]
<img class = "EMIRef" id = "353408530-00004" />
[0036]
For example, as a method of adhering such a resin to the surface of inorganic particles, the
inorganic particles are immersed in a solution in which the resin is dissolved in a solvent, or in an
emulsion in which the resin is dispersed in a dispersion medium, for example. After stirring, the
solvent or dispersion medium may be removed by means such as drying.
[0037]
The adhesion amount of the resin may be determined in advance as long as it can reduce the
wettability of water to the inorganic particles as described above. For example, the weight ratio
of the inorganic particles 100 is 0.5 or more and 5 or less. It is.
[0038]
An example B of the inorganic particles to which the resin is attached is shown as a model in FIG.
In the figure, reference numeral 20 denotes an inorganic particle, and 21 denotes a resin
attached to the inorganic particle.
[0039]
Examples of fibers constituting the fiber entangled body include natural fibers, chemical fibers,
synthetic fibers, inorganic fibers and the like generally used for a diaphragm for a speaker.
In addition, from the viewpoint of increasing the degree of interlacing fibers (reducing the
porosity), fibers having a relatively short length can be used.
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Accordingly, the adjustment can be appropriately made in consideration of the Young's modulus,
internal loss and the like of the speaker diaphragm.
A fiber entangled body can be formed by making these fibers.
[0040]
In the case of using pulp as fiber, softwood pulp having a long fiber length (N-BKP) is generally
used. The fiber length is generally 2 to 5 mm. ) But shorter fibers, such as hardwood pulp (fiber
length generally 1-2 mm). By using a small amount of) together, it is possible to reduce the
occurrence of voids in the fiber entangled body in which water easily infiltrates, and to improve
the waterproofness of the speaker diaphragm. As a preferable blending mass ratio at this time,
for example, shorter fibers such as hardwood pulp fibers with respect to softwood pulp fibers
100 are set in the range of 5 or more and 20 or less.
[0041]
A paper entangled body in which a plurality of particles are dispersed and disposed inside is
obtained by paper-making using a paper making slurry having particles, fibers and water in
which resin adheres to the surface of inorganic particles. A plurality of particles adhere to the
fiber entangled body. The papermaking slurry may further contain colorants such as various
dyes and pigments. Further, after the sheet-making, if necessary, the resin may be processed to
be impregnated into the fiber entangled body or applied to the fiber entangled body in order to
improve the staining and the Young's modulus of the speaker diaphragm.
[0042]
The speaker diaphragm of the present invention may use the above-described fiber entangled
body obtained by paper forming as it is, or a plurality of the fiber entangled bodies may be
laminated to form a speaker diaphragm. In addition, the above-described fiber entangled body
may be configured by laminating a fiber entangled body not having particles to which a resin is
attached to the surface of the inorganic particles, to constitute a speaker diaphragm.
Alternatively, materials other than the entangled body (woven fabric and non-woven fabric made
of fibers formed of inorganic material and chemical fibers formed of organic material) may be
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laminated.
[0043]
When the inorganic particles are disposed on or near the surface of the acoustic radiation
surface of the speaker diaphragm, it becomes possible to effectively contribute to the
improvement of the Young's modulus of the speaker diaphragm and the inorganic particles Mica
is preferable because it can improve the appearance when the speaker diaphragm is incorporated
into the speaker device.
[0044]
The model figure of the example which has arrange | positioned the inorganic particle B to which
resin adhered in FIG. 3 (a) near the surface of the sound radiation side of the diaphragm for
speakers is shown.
[0045]
In addition, if the inorganic particles are disposed on the surface opposite to the acoustic
emission surface or in the vicinity of the surface, the Young's modulus can be improved while
maintaining the appearance of the surface of the speaker diaphragm, or the back surface of the
speaker diaphragm It is preferable at the point which can improve the waterproofness of.
[0046]
In addition, as shown in FIG. 3B as a model, the inorganic particles B to which the resin is
attached can be disposed on the surface or both surfaces of both surfaces of the speaker
diaphragm.
At this time, the Young's modulus of the speaker diaphragm can be increased.
In addition, if necessary, the inorganic particles B to which a resin is attached can be disposed on
the surface of the surface opposite to the acoustic emission surface of the speaker diaphragm or
near this surface.
[0047]
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As mentioned above, although this invention was mentioned and described a preferable
embodiment, the diaphragm for speakers of this invention and a speaker apparatus are not
limited to the structure of the said embodiment.
[0048]
Those skilled in the art can appropriately modify the speaker diaphragm and the speaker device
of the present invention in accordance with conventionally known findings.
Of course, as long as the speaker diaphragm and the speaker apparatus of the present invention
are provided even after such a modification, they are included in the scope of the present
invention.
[0049]
Hereinafter, specific examples of the speaker diaphragm and the speaker device of the present
invention will be described.
[0050]
<Preparation of Inorganic Particles Having Resin Adhered to Surface> As the inorganic particles,
mica powder having passed through a sieve (60 mesh) having an opening of 0.3 mm was used.
The polystyrene sulfonic acid represented by the above chemical formula (2) was used as the
polymer compound constituting the resin.
[0051]
Five parts by mass of polystyrene sulfonic acid was dissolved in 50 parts by mass of water, and
100 parts by mass of the above mica was immersed and stirred in this solution.
Thereafter, the mica was taken out of the solution, and the taken out mica was dried to prepare
10-05-2019
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particles in which the resin was attached to the surface of the inorganic particles. The amount of
adhesion of the resin to the surface of the inorganic particles was confirmed by the weight
change before and after the immersion and the resin was 1 relative to the inorganic particles 100
in weight ratio.
[0052]
<Preparation of Speaker Diaphragm> 50 parts by mass of the particles prepared on the surface
of the inorganic particles were made of the resin prepared above, softwood pulp fiber 30,
hardwood pulp 5, polyethylene type resin having a fiber length of 1 to 2 mm A papermaking
slurry was prepared from 15 parts by mass of the chemical fiber to obtain a cone-shaped speaker
diaphragm for the example (outer diameter: 110 mm, inner diameter: 26.5 mm).
[0053]
Further, a speaker diaphragm of Comparative Example 1 was obtained in the same manner, but
using the same size mica used in the example without performing the resin adhesion treatment to
the surface.
[0054]
<Evaluation of waterproofness> A weight of the same mass was placed on the acoustic emission
surface of these speaker diaphragms, and the surface on the opposite side of the acoustic
emission side was simultaneously immersed in water at a position closing the inner peripheral
portion of the speaker diaphragm.
After about 6 seconds, infiltration of water was confirmed in the acoustic emission surface of the
speaker diaphragm of Comparative Example 1. At this time, infiltration of water did not occur in
the acoustic emission surface of the speaker diaphragm of the example. It was confirmed that the
speaker diaphragm of the example had high waterproofness.
[0055]
The photograph which shows the mode in FIG. 2 is shown.
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In FIG. 2, the left side is the speaker diaphragm of the embodiment, and the right side is the
speaker diaphragm of comparative example 1, and in the latter, a dark color change area
showing infiltration of water is observed in the vicinity of the inner periphery.
[0056]
<Incorporation into Speaker Device and Evaluation> The speaker diaphragm of the embodiment,
the speaker diaphragm of Comparative Example 1, and the speaker diaphragm of Comparative
Example 1 are manufactured in the same manner, and then the acoustic emission surface thereof
The speaker diaphragms of Comparative Example 2 coated with a lacquer-based treatment agent
so as to be 20 g / m 2 were incorporated in the speaker device shown in FIG. 1 and evaluated. As
a result, in Comparative Example 2 in which a lacquer resin is applied especially for
waterproofing, Young's modulus is improved, but internal loss is reduced, and sound pressure
frequency characteristics are difficult to flatten. It was confirmed that the speaker device having
the speaker diaphragm of the embodiment which does not require the waterproofing process
later is superior to the speaker device using the speaker diaphragm of Comparative Example 2.
[0057]
Reference Signs List 1 back plate 2 pole piece 3 magnet 4 plate 5 voice coil 6 voice coil support
7 damper 8 diaphragm for speaker 9 center cap 10 edge 11 frame 12 gasket 13 magnetic circuit
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