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JP2008193370

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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 JP2008193370
The present invention relates to a speaker diaphragm, a speaker, an electronic device, and a
device used in an audio device, and it is an object of the invention to make characteristics with
high accuracy and to make sound. According to the present invention, a material in which at least
a resin material and an aramid fiber are mixed is bound with an organic silicon compound, and
injection molding is performed to form a diaphragm for a speaker, whereby physical property
values of the diaphragm can be set. The configuration is such that it is possible to realize a
diaphragm having a large degree of elasticity, high moisture resistance and high moisture
resistance, high humidity resistance and high strength, excellent appearance, and improved
productivity and dimensional stability. [Selected figure] Figure 1
Speaker diaphragm, speaker using the same, electronic apparatus and apparatus using the
speaker
[0001]
The present invention relates to a speaker diaphragm used for various audio devices and video
devices, and electronic devices and devices such as speakers, stereo sets, and television sets
using the same.
[0002]
The prior art will be described with reference to FIG.
[0003]
FIG. 6 is a cross-sectional view of a conventional resin-made speaker diaphragm by injection
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molding.
[0004]
As shown in FIG. 6, the speaker diaphragm 16 is obtained by thermally dissolving resin pellets in
a mold whose shape is set in advance using a resin such as polypropylene and injection molding.
[0005]
As a kind of resin material by these injection molding, single materials, such as a polypropylene,
are generally used well.
[0006]
In addition to the above, there has been a blend type using resins of different types for the
purpose of adjusting physical property values as a diaphragm, that is, adjusting characteristics of
a speaker and sound quality.
[0007]
Furthermore, with regard to adjustment of physical property values that are difficult to adjust
with these resins, reinforcing materials such as mica were mixed to perform adjustment of
physical property values, and adjustment of characteristics as a speaker and sound quality.
[0008]
In addition, as prior art document information regarding the invention of this application, patent
document 1 and patent document 2 are known, for example.
JP-A-2-228197 JP-A-6-125593
[0009]
With respect to recent audio devices, video devices, and devices such as automobiles equipped
with these devices, performance has been dramatically improved in comparison with
conventional devices due to remarkable advances in digital technology.
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[0010]
With regard to the sound quality, low distortion, wide band, high dynamic range and further
realism have been achieved, and with regard to images also, remarkable performance
improvement has been achieved by the high definition and the appearance and spread of large
modules such as plasma displays. .
[0011]
Therefore, with the above-mentioned performance improvement of the electronic device, the
performance improvement of the speaker used for these electronic devices is strongly demanded
from the market.
[0012]
On the other hand, in the case of a speaker whose performance improvement is strongly
demanded by the market, it is indispensable to cope with the enhancement of the diaphragm
which occupies a large weight which determines the sound quality among the component parts
of the speaker.
[0013]
However, this diaphragm uses the method of manufacturing by traditional papermaking and the
method of injection molding and pressing of resin, and therefore, it is mainly a paper diaphragm
or a resin diaphragm, and while utilizing the respective features, it is used for its application It
has been used properly, but each has its own drawbacks.
[0014]
That is, in the case of a paper diaphragm, it is possible to mix aramid fibers, mica and the like
easily by wet mixing, so that physical property values can be set finely, and there is an advantage
that the freedom as a speaker characteristic and sound quality adjustment becomes large.
However, they have the disadvantages that they are inferior in moisture resistance and water
resistance, which are inherent disadvantages of paper, and that their production can not be
obtained unless a very large number of steps of papermaking are required.
[0015]
On the other hand, in the resin diaphragm obtained by injection molding, although moisture
resistance, water resistance and dimensional stability can be secured and productivity can be
improved, an inorganic filler such as mica is used to adjust physical properties, and therefore
uniform. However, it has the disadvantage that the characteristic as a speaker and the adjustment
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3
range of the sound quality become very narrow.
[0016]
The present invention solves the above-mentioned problems, the characteristics as a speaker, the
freedom of adjustment of sound quality is large, the moisture resistance, the water resistance
reliability and the dimensional stability can be secured, the appearance can be excellent, and the
productivity can be improved. It is an object of the present invention to provide a diaphragm.
[0017]
In order to achieve the above object, the present invention is a speaker diaphragm comprising at
least a resin and an aramid fiber refined to a microfibrillated state, and the diaphragm is obtained
by injection molding.
[0018]
With this configuration, the high modulus of elasticity of the aramid fiber itself can be further
increased, and by maintaining high internal loss, the degree of freedom in setting the physical
properties of the diaphragm is increased, and further moisture resistance and water resistance
reliability by the resin are obtained. It is possible to obtain a speaker diaphragm that can be
secured.
[0019]
As described above, according to the present invention, at least a resin and an aramid fiber
refined to a microfibrillated state are formed by injection molding.
[0020]
By this configuration, the entanglement between the aramid fibers is improved, the high elastic
modulus which is a feature of the aramid fibers can be further increased, and by maintaining the
high internal loss, the degree of freedom in setting physical property values of the diaphragm
becomes large. A diaphragm having excellent humidity resistance and strength and excellent
appearance can be obtained.
[0021]
In addition, by obtaining the diaphragm by injection molding, it is possible to obtain a diaphragm
with improved productivity and dimensional stability.
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[0022]
In addition, by selecting the resin and reinforcement material that is a mixed material from
among a wide variety of materials and setting the blending ratio appropriately, it is possible to
obtain high-quality characteristics and sound quality that were not possible in the past.
Adjustment is possible.
[0023]
Hereinafter, embodiments of the present invention will be described using the drawings.
[0024]
First Embodiment The first to nineteenth aspects of the present invention will be described with
reference to the first embodiment.
[0025]
FIG. 1 shows a cross-sectional view of a diaphragm according to an embodiment of the present
invention, and FIG. 2 shows an enlarged cross-sectional view of the diaphragm according to an
embodiment of the present invention.
[0026]
As shown in FIGS. 1 and 2, the diaphragm 1 is formed by injection molding of a material in which
a resin 1A, an aramid fiber 1B, and an aramid fiber 1C refined to a microfibrillated state are
mixed.
[0027]
The aramid fiber 1C which has been refined to a microfibrillated state is entangled with the
aramid fiber 1B, and as a result, entanglement of the fibers is improved, and a diaphragm with
higher strength and higher rigidity can be obtained.
[0028]
As a material of the diaphragm 1, a crystalline or amorphous olefin resin is used for the resin 1A.
[0029]
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5
By using an olefin resin, the moldability can be improved, and by using crystalline and noncrystalline resin materials properly depending on the application, it is possible to satisfy the
optimum physical property value as a resin material. It becomes possible.
[0030]
This time, among these, resin 1A explains the example at the time of using polypropylene.
[0031]
Also, although polypropylene is generally easily available and injection molding is easy, the
present invention is not limited to this resin, and it is freely used properly, such as using other
resins according to the desired characteristic value. can do.
[0032]
For example, when high heat resistance and high solvent resistance are required, engineering
plastics suitable for the application can also be used.
[0033]
Here, the aramid fiber can reproduce bright tones with a clear sense, and can suppress dark and
uniform tones unique to resins.
[0034]
In general, the modulus of elasticity of the fiber improves as the aspect ratio (fiber length / fiber
diameter) increases.
In particular, in the case of rigid fibers such as aramid fibers, this tendency is noticeable because
they have sufficient strength even if the fiber diameter is small.
Therefore, the aramid fiber is refined to a microfibrillated state, and by setting the fiber diameter
to 5 μm or less, it is possible to obtain a diaphragm in which an aspect ratio is increased and a
high elastic modulus is secured.
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[0035]
Moreover, the fiber length of the aramid fiber of this invention is comprised as 0.3 mm-6 mm.
With this configuration, it is possible to efficiently draw out the effects of granulation and
compounding with the resin and kneading, and to improve productivity and quality.
[0036]
The chopped fibrous aramid fiber has a uniform fiber length because the distribution of fiber
length is sharp, and the fiber diameter is 10 to 15 μm before being refined to a microfibrillated
state.
[0037]
Here, when the fiber length of the aramid fiber is shorter than 0.3 mm, the effect of the aramid
fiber can not be efficiently obtained, and a high elastic modulus can not be expected.
[0038]
On the other hand, if it is longer than 6 mm, a poor dispersion is likely to occur due to secondary
aggregation resulting from fiber entanglement, so that a long kneading process with the resin
may be required, or a lump of aramid fibers on the surface of the diaphragm, ie lumps Appear
and cause problems in productivity and quality, such as impairing the appearance.
[0039]
Preferably, the composite is combined with an aramid fiber of 3 mm or less, and when the fiber
length is longer than this, it becomes difficult to form the diaphragm thin.
[0040]
In addition, by combining and using chopped fiber-like aramid fibers with long fibers having a
fiber length of 1.5 mm or more and short fibers having a fiber length less than 1.5 mm,
resonance can be mitigated and fine sound quality Adjustment is possible.
[0041]
Then, by including chopped fiber-like aramid fibers and aramid fibers which are refined to a
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microfibrillated state, the entanglement between the aramid fibers is increased, and thus the
bonding strength is increased, and a diaphragm having a higher elastic modulus is obtained. You
can get it.
[0042]
Furthermore, if you want to strengthen the diaphragm, add some accents to the sound, or adjust
the sound pressure frequency characteristics to adjust the sound quality, mix mica, graphite, talc,
and cellulose fibers as reinforcements. Can also be configured.
[0043]
In this case, if mica is mixed into the reinforcing material, the elastic modulus can be increased.
In addition, when graphite is mixed, the elastic modulus and the internal loss can be increased.
Also, mixing talc can increase internal loss.
Furthermore, by mixing the cellulose fiber, the cellulose fiber and the aramid fiber are entangled,
and the internal loss can be increased without reducing the elastic modulus.
In addition, by using cellulose fibers in which part or all of the cellulose fibers are refined to a
microfibrillated state, bonding strength between the fibers can be increased and the elastic
modulus can be increased.
In addition, calcium carbonate, inorganic minerals such as clay, and high strength fibers such as
carbon fibers may be used to improve the elastic modulus.
[0044]
Then, by combining the above-mentioned materials, it is possible to freely adjust the physical
property value of the diaphragm with high precision, and to realize desired characteristics and
sound quality.
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[0045]
In addition, a compatibilizer may be used to improve the adhesion between the resin and the
aramid fiber.
By using the organosilicon compound as the compatibilizer, the bond strength between the resin
and the aramid fiber is increased, and the adhesion is improved, so that the loss of energy is
reduced, and the characteristics of the aramid fiber are more effectively activated. It is possible to
obtain a diaphragm which has high strength and high elasticity.
[0046]
In addition, by mixing an organosilicon compound having an amino group, it is possible to bind
the resin and the aramid fiber more firmly, and to obtain a diaphragm having a higher elastic
modulus in which the physical properties of the aramid fiber function effectively. it can.
As the organosilicon compound having an amino group used herein, 3aminopropyltriethoxysilane or 3-aminopropyltrimethoxysilane is more effective.
[0047]
In addition, hydrolyzable long-chain alkylsilanes are also effective when polypropylene is used as
the resin because the long-chain portion of the alkyl group has good compatibility with the olefin
resin, and as a result, polypropylene and aramid fibers are obtained. In addition, the elastic
modulus is also improved.
The hydrolyzable long-chain alkylsilane used here preferably has 6 or more carbon atoms, and
hexyltrimethoxysilane, hexyltriethoxysilane, and decyltrimethoxysilane are more effective.
[0048]
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In addition, a fluid modifier may be mixed.
As such a modifier, for example, flowable paraffin and calcium stearate can be used.
In particular, fatty acids having an amino group are desirable. By using stearic acid amide or oleic
acid amide, it is possible to thin the diaphragm formed by injection molding.
[0049]
The realization of the desired characteristics and sound quality requires deep know-how on
characteristic creation and sound creation, but in general, it is often carried out by the means
described below.
[0050]
The characteristics of the speaker and the sound generation can be changed to some extent by
varying the parameters of the component parts, and the desired characteristics and sound quality
can be approached.
[0051]
For example, when parameters of other parts except the diaphragm are fixedly fixed among
components of the speaker, the variable parameters of the diaphragm include area, shape,
weight, surface thickness, etc. There is.
[0052]
Therefore, assuming that the area, shape, weight, and surface thickness of the diaphragm are
fixed at a fixed level on the assumption that this is a general stage of the speaker design, the
sound pressure frequency of the speaker is other than the physical property value of the
diaphragm. Characteristics and sound quality are roughly determined.
[0053]
In this case, necessary peaks and dips occur on the sound pressure frequency characteristics, and
distortion often occurs in a specific frequency band.
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[0054]
Further, with regard to the sound quality, the timbre is largely influenced by the sound pressure
frequency characteristic.
[0055]
These causes are due to the area, shape, weight, and surface thickness of the diaphragm, and in
particular, most of them are due to the vibration mode of the diaphragm.
[0056]
When the present invention is applied as means for selecting a diaphragm material for improving
the above-mentioned unnecessary peaks, dips and distortions and obtaining a good sound
quality, the following results are obtained.
[0057]
First, a material that is considered to satisfy the sound pressure frequency characteristics, sound
quality, and reliability grade required for the speaker is selected as a resin, an aramid fiber, and
other mixed materials.
[0058]
In this case, the base resin is selected with particular emphasis on reliability, such as its heat
resistance grade, and a material whose inherent tone of each resin is close to a desired tone is
selected.
[0059]
Then, materials are selected for unnecessary peaks and dips on the sound pressure frequency
characteristics to be deleted.
[0060]
In the case of the dip countermeasure, a material having resonance at that frequency is selected,
and in the case of the peak countermeasure, a material having an internal loss at that frequency
is selected.
[0061]
The material selection is made with consideration to resin, aramid fiber, and other mixed
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materials, taking into account the material's specific density, elastic modulus, internal loss,
timbre, and resonance frequency when molded into a diaphragm shape.
[0062]
Then, the selected materials described above are kneaded to produce master batch pellets of a
high loading amount of aramid fibers for injection molding.
[0063]
Next, the diaphragm of the present invention is obtained by injection molding using the high
loading amount of aramid fiber masterbatch pellets.
[0064]
While measuring and evaluating the physical property values and the like of the diaphragm
obtained in this manner, a speaker is manufactured on a trial basis using this diaphragm, and the
characteristics and sound quality of the actual speaker are measured and auditioned, and the
final result is obtained. Conduct an evaluation.
[0065]
According to the above evaluation, if the desired characteristics and sound quality can not be
satisfied, this trial production process is repeated many times.
[0066]
In addition to the selection of materials, we will improve on their blending ratio and gradually
approach the target characteristics and sound quality.
[0067]
By repeating the process as described above, desired characteristics and sound quality can be
satisfied, or can be made very close.
[0068]
Furthermore, the mixing ratio of the aramid fiber to the resin of the present invention is set to 5%
by weight to 50% by weight.
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By this configuration, it is possible to efficiently draw out the effects of kneading with the resin
and to improve the productivity and the quality.
[0069]
Here, when the mixing ratio of aramid fibers is less than 5% by weight, the effect of aramid fibers
hardly appears.
[0070]
On the other hand, if it is more than 50% by weight, the kneading step is required to be long, and
since injection molding becomes difficult, productivity and dimensional stability decrease, and
the degree of freedom in shape decreases.
[0071]
In addition, the aramid fibers refined to the microfibrillar state are constituted as 5 wt% to 20
wt%.
[0072]
Here, when the content of the aramid fibers refined to the microfibrillated state is less than 5%
by weight, it is difficult to micronize to the microfibrillated state to form a network between the
fibers, and the strength and elastic modulus increase. I can not hope.
Also, when it is more than 20% by weight, no remarkable improvement in elastic modulus is
observed.
[0073]
In order to increase the elastic modulus effectively by increasing the amount of aramid fibers to
more than 20% by weight, it is sufficient to mix and use aramid fibers and chopped fiber-like
aramid fibers which have been refined to a microfibrillated state.
[0074]
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As described above, according to the present invention, the material value of the diaphragm is
formed by injection molding of a material in which a resin and an aramid fiber at least partially
refined to a microfibrillated state are mixed to form a diaphragm for a speaker. It is possible to
obtain a diaphragm which has a high degree of freedom, has high elastic modulus and high
internal loss which are features of aramid fibers, is excellent in moisture resistance and
appearance, and can improve productivity and dimensional stability.
[0075]
Second Embodiment The invention according to the twentieth aspect of the present invention will
be described below using the second embodiment.
[0076]
FIG. 3 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
[0077]
As shown in FIG. 3, the magnetized magnet 2 is sandwiched between the upper plate 3 and the
yoke 4 to constitute an internal magnetic circuit 5.
[0078]
The frame 7 is coupled to the yoke 4 of the magnetic circuit 5.
The outer periphery of any one of the diaphragms 1 according to claims 1 to 19 is bonded to the
peripheral portion of the frame 7 via an edge 9.
Then, one end of the voice coil 8 is coupled to the central portion of the diaphragm 1, and the
other end is coupled to be fitted into the magnetic gap 6 of the magnetic circuit 5.
[0079]
Although the above has described the speaker having the internal magnetic type magnetic circuit
5, the present invention is not limited to this, and may be applied to a speaker having the
external magnetic type magnetic circuit.
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[0080]
With this configuration, as described in the first embodiment, the degree of freedom in adjusting
the characteristics and sound quality is large, and the high modulus of elasticity and high internal
loss which are the features of the aramid fiber are obtained, and the moisture resistance
reliability and strength can be ensured. It is possible to realize a speaker with excellent
appearance and high productivity.
[0081]
Third Embodiment The invention according to the twenty-first aspect of the present invention
will be described below with reference to a third embodiment.
[0082]
FIG. 4 is an external view of an audio mini-component system which is an electronic device
according to an embodiment of the present invention.
[0083]
As shown in FIG. 4, the speaker 10 of the present invention is incorporated in an enclosure 11 to
form a speaker system, and an amplifier 12 as amplification means for an electric signal input to
the speaker and a source input to the amplifier 12 And an audio mini-component system 14
which is an electronic device.
[0084]
With this configuration, it is possible to realize an electronic device capable of producing
characteristics with high accuracy, making sound, and designing that could not be realized
conventionally.
[0085]
Fourth Embodiment The fourth embodiment of the present invention will be described in the
following.
[0086]
FIG. 5 shows a cross-sectional view of an automobile 15 which is an apparatus according to an
embodiment of the present invention.
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15
[0087]
As shown in FIG. 5, the speaker 10 of the present invention is incorporated in a rear tray or a
front panel and used as a part of a car navigation system or a car audio system to constitute an
automobile 15.
[0088]
With this configuration, the characteristics of the aramid fiber of the speaker 10 can be made to
have high precision characteristics, the sound can be made, and the design can be made to
improve the freedom of acoustic design of a device such as an automobile equipped with the
speaker 10 be able to.
[0089]
The speaker diaphragm, the speaker, the electronic device, and the device according to the
present invention can be applied to an electronic device such as an audiovisual device and an
information communication device which needs high-quality characteristics and needs sound
creation, and further to a device such as an automobile.
[0090]
Cross-sectional view of speaker diaphragm in one embodiment of the present invention Crosssectional enlarged view of speaker diaphragm in one embodiment of the present invention Crosssectional view of speaker in one embodiment of the present invention FIG. 16 is an external view
of an electronic device in the present invention, and a sectional view of an apparatus according to
an embodiment of the present invention, and a sectional view of a conventional speaker
diaphragm.
Explanation of sign
[0091]
DESCRIPTION OF SYMBOLS 1 diaphragm 1A resin 1B aramid fiber 1C aramid fiber refined to a
micro fibril 2 magnet 3 upper plate 4 yoke 5 magnetic circuit 6 magnetic gap 7 frame 8 voice
coil 9 edge 10 speaker 11 enclosure 12 amplifier 13 player 14 mini component system 15
Automobile
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