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JP2009021899

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DESCRIPTION JP2009021899
PROBLEM TO BE SOLVED: In a speaker for sound reproduction, the improvement of the volume
sensitivity such as the improvement of sound quality and the improvement of sound pressure
level in a bass region, and the further high quality and reliability Met. According to the present
invention, a diaphragm having a large surface thickness without using a special construction
method or a mold by mechanically breaking up bamboo fiber obtained from bamboo having a
bamboo age of one year or more. By forming 7, it is possible to improve the bending rigidity of
the diaphragm and to improve the volume sensitivity such as the improvement of the sound
quality of the speaker using this diaphragm 7 and the improvement of the sound pressure level
in the bass region. It is. [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.
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[0004]
According to the figure, the magnetic circuit 1 is adhesively bonded onto the bottom plate 1a
provided with the center pole, an annular magnet 1b adhesively bonded thereto, and the annular
magnet 1b, and between the outer periphery of the center pole 1a And an annular upper plate 1c
having an inner periphery forming a magnetic gap 1d.
[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 5 a of the voice coil 5,
and the speaker diaphragm 3 To raise and lower the sound.
[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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[0011]
This speaker diaphragm has an advantage that it is easy to control the sound quality with high
accuracy. Therefore, a speaker diaphragm made of paper (hereinafter, this speaker diaphragm
made of paper will be referred to as "diaphragm".
Many developments are underway, with a focus on
[0012]
Pulp, which is a material used for these diaphragms, has conventionally been obtained from
softwood through a beating process (also including chemical beating (digestion) using chemicals
such as alkaline digestion) because of its abundant supply Kraft pulp is being used and spurs the
very slow growth rate of softwood shortages amid 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 conifers, and those with a bamboo age of about 1 year or
less have poor rigidity and no toughness, but after 1 year or more, they have rigidity and
toughness. 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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[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 aged for more than
one year, due to the difficulty of processing due to its rigidity, its usage can only be found in
some building materials and bamboo work etc. It also led to harm, and application development
was urgent.
[0019]
With regard to the application to the diaphragm, the ease of breaking up bamboo fiber is
addressed to those with levels of silkworms and juveniles within one year of bamboo age, and
although the effect is improved to some extent, it becomes the center of the diaphragm. It did not
come to the end.
[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. Although it is effective to use a grown
bamboo fiber with toughness, it is not possible to take advantage of the original characteristics of
bamboo fiber with the conventional diaphragm manufacturing method, and satisfy the sound
quality requirements as a trend It was because I could not do it.
[0021]
In addition, as prior art literature information which concerns on the diaphragm using bamboo,
patent document 1 is known, for example.
Unexamined-Japanese-Patent No. 2000-324591
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4
[0022]
The diaphragm using kraft pulp obtained from the above-mentioned softwood is easy to
manufacture, but in a wet press method in which heat and pressure are applied after paper
making, the thickness of the diaphragm itself tends to be reduced by heating and pressing. Yes, it
was a disadvantaged method for the recovery of the low region.
[0023]
That is, it is a well-known fact that if the cone paper having the same diameter and the same
weight has the same cone surface thickness, the flexural rigidity is improved to improve the lowrange regenerating capacity. Because it is not possible to thicken the diaphragm, it has become a
disadvantageous diaphragm for low-range reproduction.
[0024]
Therefore, in order to finish the surface thickness of the diaphragm itself of the same diameter
and weight with the same diameter in the diaphragm using the conventional kraft pulp, the oven
method which does not apply pressure after paper making is generally adopted. The abovedescribed method requires a large number of man-hours and is an expensive product.
[0025]
In addition, the thickness of the diaphragm itself also tends to be nonuniform.
[0026]
In addition, as a method of finishing the surface thickness of the diaphragm itself, there is also a
semi-press method and the man-hour itself is not too much, and the thickness of the diaphragm
itself becomes uniform, but the die accuracy is required and the die itself is expensive In addition,
it has the problem that setting is difficult and requires highly skilled work.
[0027]
By the way, there were various problems in the utilization of bamboo resources mentioned above.
[0028]
Bamboo fiber has rigidity and toughness, but the diaphragm made by beating, papermaking and
wet pressing like conventional softwood is no different from conventional paper made with
diaphragm, and it has the same characteristics as conventional diaphragm Similarly, the
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reproduction of low-pass characteristics was insufficient.
[0029]
Also, in view of ease of processing, in the case of a papermaking diaphragm using bamboo within
one year as bamboo, it is used as an edible material, and it is poor in rigidity and toughness, and
utilizes the characteristics of bamboo. It could not be used as
[0030]
The present invention solves the above-mentioned problems and makes it possible to provide a
paper-making diaphragm which makes it possible to improve the low-range reproduction ability
as a speaker by utilizing the rigidity and toughness which are the characteristics of bamboo fiber.
It is an object of the present invention to provide a speaker diaphragm which is gentle to the
global environment and can be stably supplied.
[0031]
In order to solve the above-mentioned problems, according to the present invention, at least a
paper sheet containing pulp obtained by mechanical beating only bamboo fiber obtained from
bamboo having a bamboo age of one year or more, and further heating / pressurizing a
diaphragm for a speaker Form.
[0032]
The pulp is pulped only by mechanical beating and loses the rigidity and toughness possessed by
bamboo by not performing chemical treatment (beeting) such as alkaline digestion which has
been carried out with a conventional diaphragm. The speaker diaphragm is configured without
being made to be.
[0033]
As described above, bamboo fiber having rigidity and toughness is subjected only to mechanical
beating and pulped material is made into a paper sheet and then subjected to a wet press
pressure which is heated and pressed to form a diaphragm, thereby bending necessary as a
diaphragm. While maintaining rigidity, Young's modulus, and tensile strength, it is possible to
give the same surface thickness as the above-mentioned open method for securing the surface
thickness, and to control the mixing ratio of pulp that only mechanically beats bamboo fiber
Control of the surface thickness (control of the reproduction range of the low tone range).
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[0034]
As described above, the diaphragm of the present invention is constructed by making paper
including bamboo fiber pulp obtained from bamboo having a bamboo age of one year or longer
and not subjected to chemical treatment. The flexural rigidity can be improved by increasing the
thickness of the diaphragm without using a special construction method or a mold, and the lowfrequency reproduction capability of the speaker using this diaphragm can be improved.
[0035]
Furthermore, the speaker diaphragm of the present invention can provide a paper diaphragm for
speakers that is inexpensive and friendly to the global environment by using a botanical
environmental resource.
[0036]
Hereinafter, the present invention will be described with reference to FIG.
[0037]
Embodiment 1 Hereinafter, the present invention will be described with reference to the side
sectional view of the speaker in FIG. 1 according to an embodiment of the present invention, in
which the same parts as in the prior art will be assigned the same reference numerals and
explanations thereof will be omitted.
[0038]
The difference between the prior art and the present embodiment is the diaphragm 7, and the
other parts are the same as the prior art.
[0039]
The diaphragm 7 is obtained by mechanically refining bamboo of one year or more of bamboo
age, mixing it with paper from kraft pulp obtained from softwood, and variously preparing it as a
diaphragm for a 16 cm aperture as follows. The speakers of FIG. 1 were assembled for
performance comparison.
[0040]
(1) Diaphragm (1) Bamboo fiber obtained by mechanization beating was mixed with 5 wt% paper,
made into a sheet, and obtained by heating and pressing with a wet press.
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[0041]
(2) Diaphragm (2) Bamboo fiber obtained by mechanization beating was mixed with 30 wt%,
made into a sheet, and obtained by heating and pressing with a wet press.
[0042]
(3) Diaphragm (3) Bamboo fiber obtained by mechanization beating was mixed with 50 wt%
paper, made into a sheet, and obtained by heating and pressing with a wet press.
[0043]
(4) Diaphragm (4) Bamboo fiber obtained by mechanization beating was mixed with 100% by
weight, made into a sheet, and obtained by heating and pressing with a wet press.
[0044]
(5) Diaphragm (5) (comparative example) Softwood is made into paper using 100% of kraft pulp
obtained through chemical beating (digestion) and mechanical beating as described in the prior
art, and heating / adding by wet press I got it by pressing.
[0045]
In addition, as pulp materials other than the bamboo fiber of the said diaphragm (1)-(4), the kraft
pulp used by the diaphragm (5) is used.
[0046]
There are various methods for mechanical beating in fiberizing bamboo, but a beater was used.
[0047]
As a result of comparing the speakers produced by the diaphragms (1) to (4) based on the
speaker assembled with the diaphragm (5) as the comparative example, the sound quality in the
bass region reproduction band is as follows: diaphragm (4) → vibration The order was evaluated
as follows: Plate (3) → diaphragm (2) → diaphragm (1) → diaphragm (5) (comparative example).
[0048]
In the diaphragm (5) manufactured as a comparative example, the thickness of the diaphragm is
0.30 mm, and in the diaphragm (4), the thickness of 0.5 mm is about 1.7 times that of the
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diaphragm (5), and the diaphragm In (3), the thickness was 0.36 mm, which was about 1.2 times
that of the diaphragm (5), which was thicker than that of the comparative example (in each case,
the weight was about 2.2 g).
[0049]
It is known that if the diaphragm has the same diameter and the same diameter, the flexural
rigidity of the diaphragm is improved by increasing the thickness of the diaphragm, and the
sound quality in the low range reproduction band is improved. This is also confirmed in the
comparison of
[0050]
In the diaphragm (3) and the diaphragm (4), the difference in thickness from the diaphragm (5),
which is the comparative example, was remarkable, and the improvement of the bending rigidity
was also remarkable.
[0051]
Even in the diaphragm (2), a slight difference in thickness was confirmed (thickness 0.33 mm),
and it was confirmed that the sound quality was superior to that of the diaphragm (5) as the
comparative example as described above.
[0052]
In addition, although it was confirmed that the diaphragm (1) was superior in sound quality to
the diaphragm (5), the thickness was almost the same as that of the diaphragm (5).
[0053]
From the above results, the diaphragm (1) is an effect of mixing bamboo fiber itself, and the
thickness of the diaphragm itself is about the mixing amount of bamboo fiber for the diaphragm
(2) to the diaphragm (4). It was confirmed that it led to the improvement of the sound quality.
[0054]
The same wet press method, despite heating and pressure, caused differences in the thickness of
each diaphragm because the stiffness and toughness possessed by the bamboo itself, against
pressure by the wet press method It is considered that the spring back effect of the material itself
of the diaphragm itself is remarkable.
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[0055]
This is because while conventional chemical beating (digestion) dissolves lignin, which is a useful
component of bamboo, and loses the rigidity and toughness inherent to bamboo itself,
mechanical properties of bamboo are The beating alone shows that the inherent rigidity and
toughness of the bamboo can be utilized by mixing this bamboo with 5 wt% or more.
[0056]
In addition, by adjusting the mixing ratio of bamboo fiber obtained by this mechanical beating to
at least 30 WT% to 100 WT%, the thickness of the diaphragm is adjusted also in the wet press
method in which heating and pressing are performed using the same mold. Then, it was
confirmed that the predetermined sound quality in the bass band could be stably obtained.
[0057]
That is, by adjusting the amount of bamboo fiber pulp and controlling the cone thickness even
when using the same method and mold, it is easy to control the sound quality of low-range
regeneration-oriented products and mid-range regeneration-oriented products. It was confirmed
that it could be done.
[0058]
In addition to the bamboo fiber pulp of the present invention, known materials such as UKP, NKP
softwood and hardwood wood pulp or natural wood pulp such as gampi, hemp, kenaf and kapok,
chemical fibers can be used.
Further, they may be those of the beating step (conventional treatment of mechanical beating
through chemical beating (digestion)) described in the prior art.
[0059]
In addition, bamboo fiber may be a chemically refined (digested) and mechanical beatingprocessed conventional bamboo fiber (a bamboo fiber which has been subjected to the
conventional beating process can be used as a pulp material for simple papermaking. ).
[0060]
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In the above description, although the present invention has been described as making bamboo
only by mechanical beating and paper making, chemical treatment as a preparatory work for
facilitating feathering by mechanical beating of bamboo fibers falls within the scope of the
present invention. It is the one to enter.
[0061]
That is, even if it is alkaline immersion etc. which are performed before mechanical beating, it
does not intend the pulping of bamboo directly, and does not affect the lignin amount of the
above-mentioned bamboo, and only the pulping by mechanical beating is Auxiliary chemical
treatments that are easy to perform are within the scope of the present invention as the beating
itself is performed mechanically.
[0062]
That is, although it is desirable to retain the amount of lignin inherent to bamboo, it is difficult to
dissolve lignin to less than 6 WT% as in conventional alkaline digestion, and it is not possible to
utilize the inherent stiffness and toughness of bamboo of the present invention If the lignin
content of bamboo fiber after auxiliary chemical treatment for facilitating pulping by mechanical
beating is 10 WT% or more, bamboo fiber before mechanical beating according to the present
invention It can be used as
[0063]
In the above embodiment, a cone-shaped diaphragm is used as the speaker, and an externalmagnetized speaker is described as one embodiment as the magnetic circuit. However, according
to the present invention, the speaker diaphragm for papermaking is used. As long as it is a
speaker used, it is applicable to any known speaker.
That is, the magnetic circuit may be an external magnet type or an internal magnet type, and the
shape of the magnetic circuit may be round or elongated, and the entire shape of the speaker
may be elliptical as well as the cone-like embodiment. It can be widely used such as long and
narrow type speakers such as track type.
[0064]
The diaphragm and speaker for a speaker for sound reproduction according to the present
invention are required to improve the volume sensitivity such as the improvement of sound
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quality and characteristics by the diaphragm with high bending rigidity and the improvement of
sound pressure level in the bass region, and further high quality and reliability. It can be used for
a wide range of equipment such as video and audio equipment, information communication
equipment, and even mounted equipment such as automobiles, and can be applied to all known
speakers using a papermaking diaphragm as a speaker.
[0065]
Cross-sectional view of a loudspeaker according to an embodiment of the present invention
Cross-sectional view of a conventional loudspeaker
Explanation of sign
[0066]
1 magnetic circuit 1a bottom plate 1b magnet 1c top plate 2 frame 4 edge 5 voice coil 6 damper
7 diaphragm
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