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JP2009260522

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2009260522
The present invention relates to a speaker diaphragm used for various video and audio
equipment and a speaker using the same, and it is possible to provide a speaker with high sound
quality. SOLUTION: The speaker diaphragm of the present invention is made by making a paper
containing 60 wt% or more of pulp obtained by mechanical beating only bamboo fiber obtained
from a bamboo equivalent to 2 years of bamboo age, heated and pressed. It is possible to provide
a high-quality speaker that provides a three-dimensional sound. [Selected figure] Figure 1
Speaker diaphragm and speaker using the same
[0001]
The present invention relates to a speaker diaphragm used for various audio devices and video
devices, and a speaker for sound reproduction using the speaker diaphragm.
[0002]
In the recent audio industry and the automobile industry equipped with audio devices, the spread
of digital devices has dramatically improved the sound quality reproduced from speakers.
[0003]
Such a conventional speaker will be described with reference to the side sectional view of the
speaker in FIG.
[0004]
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1
According to the figure, the magnetic circuit 1 is adhesively bonded onto the bottom plate 1a
made of a metal magnetic material provided with a center pole, an annular magnet 1b adhesively
bonded thereto, and the annular magnet 1b. And an upper plate 1c made of an annular metallic
magnetic material having an inner periphery forming a magnetic gap 1d with the outer periphery
thereof.
[0005]
The frame 2 is formed by metal plate or resin molding, and is adhesively bonded to the upper
plate 1 c of the magnetic circuit 1.
[0006]
An outer periphery of the speaker diaphragm 3 is adhesively bonded to the frame 2 via the edge
4 and an inner periphery is adhesively bonded to the voice coil 5 fitted in the magnetic gap 1 d
of the magnetic circuit 1.
[0007]
The voice coil 5 is provided with a damper 6 whose inner periphery is adhesively bonded to the
voice coil 5 and whose outer periphery is adhesively bonded to the frame 2 to support vertical
drive of the voice coil 5.
[0008]
The speaker configured as described above moves the voice coil 5 up and down by inputting an
audio signal from the outside to both ends (not shown) of the coil portion of the voice coil 5, and
the speaker diaphragm 3 is The sound is emitted by moving up and down.
[0009]
The above-mentioned trends with respect to speakers of audio equipment and video equipment
manufacturers are high sound quality, weight reduction, and environmental harmony.
[0010]
In high sound quality, in order to realize sound quality requirements that are user needs, it is
urgently necessary to develop a speaker diaphragm that is a component of a speaker with a high
weight that determines the sound quality.
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2
[0011]
This speaker diaphragm has an advantage that it is easy to control the sound quality with high
accuracy, so that a speaker diaphragm made of paper (hereinafter, this speaker diaphragm made
of paper will be referred to as "speaker diaphragm".
Many developments are underway, with a focus on
[0012]
Pulp, which is a material used for these speaker diaphragms, is conventionally obtained from
softwoods through a beating process (including chemical digestion using chemicals such as
alkaline digestion) since soft pulp is abundantly supplied. Kraft pulp is being used, and it is in a
state of spurring the very slow growth rate of softwood under growing demand.
[0013]
On the other hand, with regard to bamboo, due to its strong reproductive power and rapid
growth ability, there are very many types and quantities all over the world, and in specific areas,
bamboo damage is exacerbated as it spreads.
[0014]
Bamboo grows very fast compared to coniferous trees, and those with a bamboo age of about 1
year or less have poor rigidity and no toughness, but synthetic and toughness after 1 year or
more It is generally said that it comes to have stable physical properties.
[0015]
In addition, it has the advantage that the original bamboo grove is regenerated immediately after
logging, and it does not lead to a situation that adversely affects the local environment like
coniferous forest logging.
[0016]
Rather, cutting down too many bamboo forests to eliminate bamboo damage is a desirable
situation for the global environment.
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In addition, it is thought that it is kind to the earth also from the viewpoint of efficiency of
photosynthesis that bamboo which fell into aging stage is harvested and encourages the growth
of new bamboo.
[0017]
These bamboos have been developed for many years since their use, but those with bamboo and
juvenile levels within one year of bamboo age have many in food and other aspects due to their
softness and ease of processing. It was often used for the direction.
[0018]
However, with regard to grown bamboo with high rigidity, which has been at least one year old,
it is difficult to process due to its rigidity, and its use can only be found in some building
materials and bamboo work etc. It also led to harm, and application development was urgent.
[0019]
As for the application to the speaker diaphragm, although it is addressed to the ones with
bamboo and juvenile levels within one year of bamboo age because of the ease of
disentanglement of bamboo fiber, although it has some effect, the speaker diaphragm It did not
happen until it became the center of
[0020]
The reason for this is that in order to bring out the characteristics of the original bamboo fiber, it
takes more than one year of bamboo age to be more rigid than using a soft and easy-to-process
bamboo within one year of bamboo age or juvenile level. It is more effective to use a grown
bamboo fiber with toughness, but the conventional method for manufacturing a speaker
diaphragm can not make full use of the features of the conventional bamboo fiber, and the sound
quality requirement is considered to be a trend. It is because it could not be satisfied.
[0021]
In addition, as prior art literature information which concerns on the diaphragm for speakers
using bamboo of 1 year or more of bamboo age, patent document 1 is known, for example.
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4
JP 2007-221635 A
[0022]
Although the reference document prescribes that it should be at least one year of bamboo age, in
practice there are many cases where the optimal bamboo age differs depending on the type of
bamboo, bamboo sok, broken bamboo, and bamboo.
In addition, in the process of beating the fibers before forming into a papermaking type speaker
diaphragm, there are many cases where a large shearing force is applied wet, and there are some
which are not suitable depending on the type of bamboo.
For example, in the case of bamboo grass, the fibers are fragile, and there are cases where the
fibers are broken before applying a shearing force in the refining process.
[0023]
The present invention is intended to provide an excellent papermaking type speaker diaphragm
that solves the above-mentioned problems.
[0024]
The present invention is a wet beating process, has sufficient flexibility even when exposed to a
large shear force, and has a large amount of information when attached to a speaker as a
papermaking type speaker diaphragm, resulting in a three-dimensional effect. It is to provide a
speaker diaphragm for producing a certain sound.
[0025]
The speaker diaphragm of the present invention is pulped only by mechanical beating, and the
bamboo diaphragm can be obtained by not performing the chemical treatment such as alkali
digestion (beating) which has been carried out with the conventional speaker diaphragm. The
speaker diaphragm is configured without losing the rigidity and toughness which it has.
[0026]
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5
The diaphragm made of a speaker is formed by forming a diaphragm for a speaker by wetpressing the paper material after making only the mechanical beating and pulping bamboo fiber
having rigidity and toughness as described above, and heating and pressing it. Can be given the
same surface thickness as the above-mentioned open method for securing the surface thickness
while maintaining the required flexural rigidity, Young's modulus, and tensile strength, and also
the mixed ratio of pulp where only mechanical beating bamboo fiber Control of the surface
thickness (control of the reproduction range of the low tone range) can also be performed by
controlling.
[0027]
In particular, it is best to have a bamboo age of 2 years.
Jitake is a bamboo that grows mainly in Sichuan Province, People's Republic of China, and has a
shorter life and is flexible even though its rigidity is almost the same as that of Shintake, which is
said to be promising as a reinforced fiber for plastics. It is rich in sex.
It is possible to determine the bamboo age of this bamboo by the following judgment.
Bamboo of less than 1 year has peels on bamboo nodes and white segments.
The equivalent of two years of bamboo has no peel on the bamboo knots and white knots.
When it is over 3 years, there is no skin on the bamboo nodes and the nodes become dark.
Therefore, it is possible to judge bamboo equivalent to 2 years by observing bamboo knots.
[0028]
A bamboo for less than a year is flexible but lacking in rigidity.
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Jitake for over 3 years is rigid but lacks flexibility.
It is best to have a bamboo equivalent to two years of bamboo age.
[0029]
As described above, the speaker diaphragm of the present invention is constructed by papermaking with bamboo fiber pulp obtained by mechanical refining of bamboo fiber obtained from a
bamboo equivalent to a bamboo age of 2 years, as a main component. When the speaker
diaphragm thus attached is attached to the speaker, a sound having a three-dimensional feeling
of information can be provided.
[0030]
Furthermore, the speaker diaphragm of the present invention can provide a papermaking type
speaker diaphragm for speakers that is inexpensive and environmentally friendly by using a
botanical environmental resource.
[0031]
Hereinafter, an embodiment of the present invention will be described.
[0032]
Embodiment 1 Hereinafter, an embodiment of the present invention will be described mainly
focusing on differences from the prior art.
[0033]
The difference between the prior art and the present embodiment will be described with
reference to FIG. 1. The difference lies in the diaphragm 3 for the speaker, and the
manufacturing method including the composition of the diaphragm 3 for the speaker is different.
Is the same as
[0034]
Accordingly, an embodiment of the present invention will be described with reference to the
following examples and comparative examples with respect to a speaker diaphragm.
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[0035]
(Example 1) Loudspeaker diaphragm 3 is made by mechanical beating only bamboo fiber
extracted from a bamboo equivalent to 2 years of bamboo age to a Canadian standard freeness of
680 ml, vibration for speaker for 16 cm aperture The plates were fabricated and the
loudspeakers of FIG. 1 were assembled and compared for performance.
[0036]
(Example 2) The same as Example 1 except that the fiber composition is changed, and only
mechanical beating is performed until the Canadian standard freeness becomes 680 ml, and after
this mechanical beating, the diaphragm made of paper has a bamboo age Each material is
composed of 80 wt% of bamboo fiber extracted from a two year equivalent of bamboo, 8 wt% of
bamboo fiber with a BET specific surface area of 1.15 m <2> / g, 7 wt% of Filipina crust and 5
wt% of hemp hemp The mixture was poured into a bittern, subjected to the above-mentioned
beating, and paper-made. A speaker diaphragm was produced in the same manner as in Example
1, and the speakers were assembled to compare their performance.
[0037]
(Example 3) Example except that the fiber composition after beating is made 60 wt% of bamboo
fiber extracted from a bamboo age equivalent to 2 years of bamboo age, 37 wt% of commercially
available NUKP (non-digested wood pulp) and 3 wt% of Filipina peel In the same manner as in 2,
the speaker diaphragm was manufactured, and the speakers were assembled for performance
comparison.
[0038]
Comparative Example 1 A speaker diaphragm was produced in the same manner as in Example 1
except that the bamboo age equivalent to 1 year of bamboo age used in Example 1 was replaced
with the bamboo age equivalent to 1 year of bamboo age, The speakers were assembled and their
performance was compared.
[0039]
Comparative Example 2 A speaker diaphragm was manufactured in the same manner as in
Example 1 except that the bamboo age equivalent to 3 years of bamboo age was used instead of
the bamboo age equivalent to 2 years of the bamboo used in Example 1, The speakers were
assembled and their performance was compared.
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[0040]
Comparative Example 3 A speaker diaphragm is manufactured in the same manner as in Example
1 except that the bamboo age equivalent to 2 years of bamboo age is used instead of the bamboo
age equivalent to 2 years of the bamboo used in Example 1, and a speaker is manufactured. The
performance was compared.
[0041]
In addition, many things like bamboo powder were generated at the time of beating.
It is considered that the flexibility to endure the wet beating is lacking.
[0042]
Comparative Example 4 A speaker diaphragm is manufactured in the same manner as in Example
1 except that a bamboo age equivalent to 2 years of bamboo age is used instead of the bamboo
age equivalent to 2 years used in Example 1, and a speaker diaphragm is manufactured. The
performance was compared.
[0043]
Comparative Example 5 A diaphragm for a speaker was produced in the same manner as in
Example 1 using commercially available NUKP (non-digested wood pulp) in place of the 2-year
bamboo age equivalent of Jitake used in Example 1 And assembled the speakers for performance
comparison.
[0044]
Comparative Example 6 The same as Example 1 except that the fiber composition was changed,
and only mechanical beating was performed until the Canadian standard freeness reached 680
ml, and after this mechanical beating, the paper board made of paper had a bamboo age Each
material is put into a bittern so as to be composition of 55 wt% bamboo fiber, 42 wt%
commercially available NUKP, and 3 wt% Filipino peel extracted from a birch equivalent to 2
years, the above beating is carried out, and Similarly, a speaker diaphragm was fabricated, and
the speakers were assembled to compare their performance.
[0045]
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In addition, additives such as dyes other than the fiber component and manufacturing conditions
such as press temperature, pressure and time were all carried out under the same conditions.
[0046]
(Employee evaluation) The audition comparison evaluation of Examples 1 to 3 and Comparative
Examples 2 to 6 was carried out and scored on 6 items by 10 people (total of 100 points) with
10 points out of 5 points based on Comparative Example 1 as the standard 5 points .
The results are shown in (Table 1).
[0047]
[0048]
As shown in (Table 1), it was confirmed that the loudspeakers using the loudspeaker diaphragms
described in Examples 1 to 3 are superior in hearing sense to Comparative Examples 1 to 6.
This is because the speakers produced in Examples 1 to 3 have a lot of information at the time of
listening to the sound, there is also a three-dimensional feeling (presence of presence) of the
sound, and they are not only rigid as a papermaking type speaker diaphragm It is presumed that
it also has flexibility.
[0049]
As apparent from the above Examples and Comparative Examples, from Example 1, Example 3
and Comparative Example 3, those containing at least 60 wt% or more of a bamboo equivalent to
2 years of bamboo age are suitable for a speaker diaphragm It was confirmed that the
[0050]
In addition, from Example 2 and Example 3, bamboo fiber, philippines bark, and manila hemp
containing a total of 3 to 20 wt% of feathered to 1.15 m <2> / g in BET specific surface area,
100% of jitake It was confirmed that the speaker diaphragm was superior to the one described
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above.
[0051]
From the viewpoint of rigidity improvement, mixing of bamboo fibers having a BET specific
surface area of 1 m <2> / g or more is particularly preferable.
A total of 20 wt% of the above three types including Philippine crust and Manila hemp can be
finished into a speaker diaphragm with a sharp and high contrast tone.
If it is less than 3 wt%, there is almost no effect, and if it exceeds 20 wt%, the effect is not
improved.
[0052]
In addition, it is confirmed that the same effect can be obtained even if either a bamboo fiber
with a BET specific surface area of 1.15 m <2> / g or a Philippine scum or Manila hemp is
included alone.
[0053]
Moreover, although the above-mentioned Example demonstrated as what used the bamboo fiber
feathered to 1.15 m <2> / g by BET specific surface area, it feathered to less than 1 m <2> / g by
BET specific surface area In the case of using bamboo fiber, it is confirmed that the fiber
entanglement is bad and it is not preferable for the preparation of a speaker diaphragm, and at
least the BET specific surface area of the above example is 1.15 instead of 1 m <2> / g. It was
also confirmed that the same effect as in Example 2 can be obtained by using feathered bamboo
fiber with filipi peel and / or manila hemp or alone.
[0054]
Although not particularly described in the above-described embodiment, it has been confirmed
that the provision of a more excellent loudspeaker diaphragm is possible by adding the following
matters to the preparation conditions of the loudspeaker diaphragm.
[0055]
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That is, in the case of using a bamboo equivalent to a bamboo age of 2 years as a main
component to be used as a papermaking type speaker diaphragm, 550 ml to 700 ml is preferable
in terms of Canadian standard freeness.
The beating process may be performed with a known beating apparatus such as a beater refiner
until the beating degree is reached.
If it is smaller than 550 ml, the water leakage at the time of papermaking will be worse and the
production efficiency will be significantly reduced.
If it is larger than 700 ml, the entanglement between bamboo fibers becomes significantly worse.
[0056]
The embodiment of the preferred speaker diaphragm considering up to the Canadian standard
freeness has a BET specific surface area to 60 to 80 wt% of a bamboo equivalent to a bamboo
age of 2 years with 630 ml to 680 ml of Canadian standard freeness. 3 wt% to 10 wt% bamboo
fiber of 1 m <2> / g or more, and 5 wt% to 10 wt% of Filipino bark with Canadian standard
freeness of 180 ml to 250 ml, and 3 wt% to 8 wt% of manila hemp In the range of this
composition, in addition to the amount of information of the sound and the three-dimensional
feeling of the sound most sought in the present invention, when attached to a speaker, the
extension of high-pitched sound, medium-gloss gloss, bass-impact and sound-jumping is excellent
It has been confirmed that it becomes a speaker diaphragm.
[0057]
Further, in the present embodiment, the beating of a dike equivalent to a bamboo age of 2 years
has been described as only mechanical beating, but it is preferable to perform oxygen treatment
/ bacterial treatment as treatment before beating.
As compared with digestion (high temperature, high pressure, alkali treatment), not only the
yield of bamboo fiber obtained from bamboo is increased, but also the appropriate lignin remains
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so as not to weaken the interfiber interaction between bamboo fibers. preferable.
When lignin remains at 10 wt% or more in bamboo fiber, the amount of information is large and
the sound quality is three-dimensional.
Judging from our experience, the stiffness derived only from hydrogen bonds between cellulose
tends to be inorganic sound, and the sound obtained from the speaker diaphragm with lignin left
as binder is pleasing to the human ear It is considered to be
[0058]
In the above embodiment, the speaker using the external magnet type magnetic circuit shown in
FIG. 1 has been described, but it can also be used for the speaker using the internal magnet type
magnetic circuit using a cylindrical magnet It is.
[0059]
The speaker diaphragm for sound reproduction and the speaker according to the present
invention can sense a large amount of information when listening to a sound, and also improve
the stereoscopic sensitivity.
Furthermore, it can be used for a wide range of equipment such as audiovisual equipment and
information communication equipment that require high quality and reliability, and also
equipment installed in automobiles, and all known speakers that use a papermaking type speaker
diaphragm It is applicable.
[0060]
Cross-sectional view of a conventional speaker
Explanation of sign
[0061]
DESCRIPTION OF SYMBOLS 1 Magnetic circuit 1a Bottom plate 1b Magnet 1c Top plate 2 Frame
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3 Diaphragm for speakers 4 Edge 5 Voice coil 6 Damper
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