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JP2009021898

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DESCRIPTION JP2009021898
The present invention relates to a speaker diaphragm, a speaker, an electronic device, and a
device used for an audio device, which has an object to reduce environmental load and to have
high sound quality and quality of appearance. According to the present invention, there is
provided a vibration for a speaker, which comprises a polylactic acid 27A extracted from a plant
and bamboo fibers 27B, and the bamboo fibers 27C finely divided to a microfibrillated state in a
part of the bamboo fibers 27B. By forming the plate 27, a speaker diaphragm having high heat
resistance and high strength and being environmentally friendly can be realized. [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
molding.
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1
[0004]
As shown in FIG. 6, the speaker diaphragm 7 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 adjust the physical property
values, and the characteristics as a speaker and the sound quality were adjusted.
[0008]
Moreover, in order to further increase the degree of freedom of physical property adjustment,
the pulp material is mixed and sound quality adjustment is performed.
[0009]
However, since the base resin is polypropylene and this polypropylene is derived from
petroleum, the environmental load was large.
[0010]
Therefore, in recent years, with the movement of de-petrochemical work, studies using plantderived polylactic acid as a resin have been actively conducted.
[0011]
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2
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
JP, 2005-260546, A
[0012]
In the speaker diaphragm using the conventional polylactic acid, high reliability can not be
realized due to insufficient heat resistance, and problems in sound quality have been left in terms
of insufficient strength and low elastic modulus.
[0013]
An object of the present invention is to solve the above-mentioned problems and to provide a
speaker diaphragm which can realize high sound quality with less environmental load.
[0014]
In order to achieve the above object, the present invention is a vibration for a speaker, which
comprises a polylactic acid extracted from a plant and bamboo fibers, and the bamboo fibers
partially include bamboo fibers finely divided to a microfibrillated state. It is a board.
[0015]
With this configuration, heat resistance, which is a problem of polylactic acid, is improved, and
since entanglement of the fibers is strengthened by including fibers in which a part of bamboo
fiber is finely divided into a microfibrillated state, heat resistance is also increased. Sound quality
is also improved.
[0016]
And since all constituent materials are derived from plants and are not petroleum-derived
materials, the environmental load can be reduced, and an environmentally friendly speaker
diaphragm can be realized.
[0017]
As described above, the present invention is configured of a diaphragm for a speaker, which is
made of polylactic acid extracted from a plant and bamboo fibers, and the bamboo fibers are
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3
partially made into microfibrillar bamboo fibers. doing.
[0018]
With this configuration, the heat resistance, which is a problem of polylactic acid, is improved,
and by including bamboo fibers finely divided into a microfibrillated state, the entanglement of
bamboo fibers becomes strong, and a speaker diaphragm having high strength is obtained. Can.
[0019]
Therefore, the speaker diaphragm, which is composed of polylactic acid extracted from plants
and bamboo fibers, and which comprises bamboo fibers finely divided to a microfibrillated state
as a part of the bamboo fibers, is petroleum-derived chemistry Without using any substance, it is
possible to provide a speaker diaphragm that is heat resistant, has high strength, and is
environmentally friendly.
[0020]
Hereinafter, embodiments of the present invention will be described using the drawings.
[0021]
First Embodiment The first to eighth aspects of the present invention will be particularly
described with reference to the first embodiment.
[0022]
FIG. 1 shows a cross-sectional view of a diaphragm according to an embodiment of the present
invention, and FIG. 2 shows a plan view of a diaphragm according to an embodiment of the
present invention.
[0023]
As shown in FIGS. 1 and 2, the diaphragm 27 uses a polylactic acid 27A extracted from a plant as
a base resin, and the bamboo fibers 27B finely made to a microfibril state are intertwined with
the bamboo fibers 27B in the polylactic acid 27A. However, the material dispersed uniformly is
formed by injection molding.
[0024]
With this configuration, the heat resistance is further improved and the reliability is enhanced as
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compared with the case where the polylactic acid extracted from the plant and the bamboo fiber
are mixed.
[0025]
In addition, the inclusion of bamboo fibers finely divided to a microfibrillated state increases the
entanglement of bamboo fibers with each other to increase strength and elastic modulus, thereby
improving sound quality.
[0026]
In addition, it is desirable that the average fiber diameter of bamboo fibers refined to a
microfibrillated state is 10 μm or less.
[0027]
In general, the higher the aspect ratio (L / D), which is the ratio of fiber length L to fiber diameter
D, the higher the elasticity, and bamboo fibers finely made into microfibrils have a high aspect
ratio so that a high elastic modulus can be expected. .
[0028]
In addition, there is also an effect that the bond between fibers becomes strong, and these act
together to provide a high elastic modulus.
[0029]
The fiber length of the bamboo fiber to be mixed is preferably 0.2 mm or more and 3 mm or less.
By using bamboo fiber within the range of the fiber length, the effect when compounded with
polylactic acid 27A is efficiently exhibited.
[0030]
If the fiber length of bamboo fiber is shorter than 0.2 mm, the effect of bamboo fiber can not be
efficiently obtained, and a high elastic modulus can not be expected.
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[0031]
On the other hand, if the length is longer than 3 mm, dispersion defects are likely to occur due to
second-order pseudo-aggregation resulting from the entanglement of bamboo fibers.
Therefore, it takes a long time to knead with the polylactic acid 27A.
Alternatively, aggregates of bamboo fibers appear on the surface of the diaphragm 27 and the
appearance is impaired.
Thus, productivity and quality are reduced.
[0032]
Also, if you want to make bamboo fiber more natural and brighter, it is better to use bamboo
powder as a part of bamboo fiber.
When the content of bamboo fiber and bamboo fiber finely divided to a microfibril state exceeds
35% by weight, it takes a long time to disperse uniformly in polylactic acid extracted from plants,
causing poor dispersion. In some cases, the characteristics of the bamboo fiber contained can not
be exhibited well.
[0033]
The flowability also decreases, which makes injection molding difficult, lengthens the molding
cycle, and lowers productivity.
[0034]
Then, it can be solved by using bamboo powder together in order to obtain a high productivity
diaphragm for speakers by injection molding in the range of content of bamboo fiber being more
than 35 weight% and 60 weight% or less.
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[0035]
In addition, when the content of bamboo fiber exceeds 50% by weight, it becomes possible to
incinerate as bamboo material instead of landfill disposal at the time of disposal.
[0036]
The amount of bamboo fiber to be mixed is preferably 5% by weight or more and 60% by weight
or less, and more preferably 10% by weight or more and 60% by weight or less.
[0037]
When the content of bamboo fiber is 5% by weight or less, the effect of bamboo fiber does not
appear remarkably, and when the content is 5% by weight or more, the heat resistance effect is
more easily exhibited.
[0038]
Furthermore, if it is desired to strengthen the diaphragm 27, add some accent to the sound, or
make the sound pressure frequency characteristics to have a peak and adjust the sound quality, a
reinforcing material may be mixed.
[0039]
It goes without saying that reinforcing materials such as mica, talc and graphite are of course
conventional, but reinforcing materials extracted from plants are preferred in order to reduce
environmental burden.
[0040]
The reinforcing material to be extracted from plants is preferably bamboo charcoal obtained by
carbonizing bamboo at a high temperature of 800 ° C. or higher and then grinding and
granulating it.
[0041]
The granular form facilitates uniform dispersion in polylactic acid obtained by extraction from
plants at the time of melt-kneading.
[0042]
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Further, by uniformly dispersing, the elastic modulus is improved, and the internal loss is also
improved by bamboo charcoal, and high sound quality can be realized.
[0043]
And the effect of bamboo charcoal has not only the sound quality but also the function of the
improvement of heat resistance and the improvement of appearance grade.
[0044]
As described above, the present invention comprises a diaphragm for a speaker, which is
composed of polylactic acid extracted from plants and bamboo fibers, and bamboo fibers finely
divided to a microfibrillated state as a part of the bamboo fibers. As a result, it is possible to
improve the insufficient heat resistance and the insufficient strength, which are the
disadvantages of the conventional polylactic acid, and also improve the internal loss.
[0045]
Furthermore, since no petroleum-derived chemical substance is used at all, it is possible to obtain
an environmentally friendly high-quality speaker diaphragm.
[0046]
Second Embodiment The invention according to the ninth aspect of the present invention will be
described below with reference to a second embodiment.
[0047]
FIG. 3 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
[0048]
As shown in FIG. 3, the magnetized magnet 21 is sandwiched between the upper plate 22 and the
yoke 23 to form an internal magnetic circuit 24.
[0049]
The frame 26 is coupled to the yoke 23 of the magnetic circuit 24.
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The outer periphery of any one of the diaphragms 27 according to claims 1 to 8 is bonded to the
peripheral portion of the frame 26 via an edge 29.
Then, one end of the voice coil 28 is coupled to the central portion of the diaphragm 27, and the
other end is coupled to be fitted into the magnetic gap 25 of the magnetic circuit 24.
[0050]
The above has described the speaker having the internal magnet type magnetic circuit 24.
However, the present invention is not limited to this, and may be applied to a speaker having the
external magnet type magnetic circuit.
[0051]
With this configuration, as described in the first embodiment, it is possible to realize a high
sound quality speaker with less environmental load.
[0052]
Third Embodiment The invention according to the tenth aspect of the present invention will be
described below with reference to the third embodiment.
[0053]
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.
[0054]
The speaker 10 is incorporated in the enclosure 11 to constitute a speaker system 21.
The amplifier 12 includes an amplification circuit of an electrical signal to be input to the
speaker system 21.
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The operation unit 13 such as a player outputs the source input to the amplifier 12.
Thus, the audio mini-component system 14 which is an electronic device includes the amplifier
12, the operation unit 13, and the speaker system 21.
The amplifier 12, the operation unit 13, and the enclosure 11 are main parts of the mini
component system 14.
That is, the speaker 10 is mounted on the main body of the mini component system 14.
Further, the voice coil 28 of the speaker 10 is supplied with power from the amplifier 12 of the
main body and emits sound from the diaphragm 27.
With this configuration, it is possible to obtain the mini component system 14 which has high
environmental quality and high quality with less environmental load which can not be realized
conventionally.
[0055]
In addition, although the mini component system 14 for audio was demonstrated as an
application to the apparatus of the speaker 10, it is not limited to this.
Applications to portable portable audio devices and their charging systems are also possible.
Furthermore, the present invention can be widely applied to and developed in electronic devices
such as image devices such as liquid crystal televisions and plasma display televisions,
information communication devices such as mobile phones, and computer related devices.
[0056]
Fourth Embodiment The fourth embodiment of the present invention will be described in the
following.
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10
[0057]
FIG. 5 shows a cross-sectional view of an automobile 15 which is an apparatus of an embodiment
of the present invention.
[0058]
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.
[0059]
With this configuration, it is possible to utilize the features of the speaker 10 and reduce the
environmental load while achieving an excellent design with high sound quality, and reduce the
environmental load of a device such as an automobile equipped with the speaker 10 be able to.
[0060]
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 a video and audio device and an
information communication device which requires high sound quality and further to a device
such as an automobile.
[0061]
Cross-sectional view of speaker diaphragm in one embodiment of the present invention Top view
of diaphragm for speaker in one embodiment of the present invention Cross-sectional view of
speaker in one embodiment of the present invention in one embodiment of the present invention
External view of electronic device Cross-sectional view of device according to one embodiment of
the present invention Cross-sectional view of a conventional speaker diaphragm
Explanation of sign
[0062]
DESCRIPTION OF SYMBOLS 10 Speaker 11 Enclosure 12 Amplifier 13 Operation part 14 Mini
component system 15 Automobile 21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25
Magnetic gap 26 Frame 27 Vibrator plate 27A Poly lactic acid 27B extracted from plants
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Bamboo fiber 27C Fine to microfibrillated Bamboo fiber 28 voice coil 29 edge
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