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JP2009278309

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DESCRIPTION JP2009278309
The present invention relates to a diaphragm for a speaker used in various video equipment and
audio equipment and a speaker using the same, and a diaphragm having an extension in a high
range tends to have a generally pleasing tone. It was a challenge to improve this. A speaker
diaphragm according to the present invention secures a wide reproduction zone by adding or
surface-coating at least one of kraft lignin or lignin sulfonate as a speaker diaphragm
manufactured by a papermaking method. However, the speaker diaphragm can realize a mellow
tone by suppressing the loud feeling of sound in terms of sound quality. [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]
And the trend for these speakers is high sound quality, weight reduction, and environmental
harmony.
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[0004]
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.
[0005]
Since this speaker diaphragm has an advantage that the sound quality can be controlled with
high accuracy, the speaker diaphragm by papermaking (hereinafter, the speaker diaphragm by
papermaking is referred to as "speaker diaphragm"). Many developments are under way at the
center.
[0006]
Pulp, which is a material used for these speaker diaphragms, is conventionally obtained from
softwoods through a beating process (also including chemical beating (digestion) using chemicals
such as alkaline digestion) since the supply is abundant. The kraft pulp used is in a state of
increasing demand for the very slow growth rate of softwood shortages.
[0007]
In the digesting process, the present condition is that components such as lignin, which is the
second largest component of plant components, are discharged as black liquor and lignin, which
is an important resource, is discarded without being reused. .
[0008]
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.
[0009]
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 after 1 year or more, they have rigidity and
toughness. It is generally said that it comes to have stable physical properties.
[0010]
In addition, it has the advantage that the original bamboo grove is regenerated immediately after
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logging, and it does not lead to a situation that adversely affects the local environment like
coniferous forest logging.
[0011]
Rather, cutting down too many bamboo forests to eliminate bamboo damage is a desirable
situation for the global environment.
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.
[0012]
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.
[0013]
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 led to harm, and application development was
urgent.
[0014]
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
[0015]
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 that has toughness, it is not possible to take advantage of the original features of
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bamboo fiber with the conventional manufacturing method of the speaker diaphragm, and the
sound quality requirement as a trend is It is because it could not be satisfied.
[0016]
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.
JP 2007-221635 A
[0017]
In the digesting process, it had the subject that components, such as lignin, were discharged ¦
emitted as a black liquor, and the lignin which is an important resource was discarded without
being recycled.
[0018]
For this reason, in the conventional method, the reproduction band of the high range expands,
but the sound quality tends to be loud, and the sound quality tends to be lacking in the
roundness of the sound.
[0019]
The present invention solves the above-mentioned problems, and while maintaining the
reproduction band of sound, suppresses loud feeling in terms of sound quality and supplies a
speaker diaphragm that produces a mellow tone, and is an important resource that has been
discarded It is an object of the present invention to realize a speaker diaphragm having good
sound quality by reusing.
[0020]
In order to achieve the above object, the present invention provides an additive or a surface
coating agent for a papermaking diaphragm in order to realize a papermaking diaphragm
capable of providing a mellow tone in tone quality while providing a sound with a wide
reproduction band. As a speaker diaphragm, at least one of kraft lignin and lignin sulfonate is
used.
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[0021]
By this constitution, at least one or more of kraft lignin or lignin sulfonate acts as a binder
between fibers, generates an effect of enhancing interfiber force as a binder, and has a large
number of rigid benzene rings. On the other hand, the effect of lignin, which also has a flexible
ether bond on both the hard and soft side, can obtain the effect of exhaling a mellow tone with
suppressed loud feeling while keeping the regeneration zone wide.
[0022]
As described above, the speaker diaphragm of the present invention has a broad reproduction
band while maintaining a wide reproduction zone by adding or surface-coating at least one of
kraft lignin or lignin sulfonate and acting as a binder between fibers. It is possible to realize an
excellent speaker diaphragm capable of reproducing a mellow tone.
[0023]
Furthermore, the present invention can provide an inexpensive and environmentally friendly
speaker diaphragm.
[0024]
First Embodiment The first to third aspects of the present invention will be particularly described
with reference to the first embodiment.
[0025]
FIG. 1 is a cross-sectional view of a speaker diaphragm 27 according to an embodiment of the
present invention.
[0026]
The lignin-derived compounds used in the present invention are kraft lignin and its modified
products or lignin sulfonates and their modified products which are discarded as black liquor in
the pulp manufacturing process.
[0027]
These kraft lignin and its modified products or lignin sulfonates and their modified products are
effective not only in terms of the effective use of resources but also in terms of dispersibility in
water and solvents.
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[0028]
Examples of the present invention will be described below, but the examples do not limit the
present invention.
[0029]
(Example 1) The main fiber is NUKP (unexposed Kraft wood pulp) which is beaten to 680 ml of
Canadian standard freeness with a beater as a main fiber, and sodium lignin sulfonate having an
organic sulfur content of 2.4% relative to 100 wt% of fiber 5 wt% was added to make a 16 cm
diameter papermaking diaphragm.
[0030]
(Example 2) A digested bamboo pulp beaten to 685 ml of Canadian standard freeness in beater is
used as a main fiber, and 5 wt% of sodium lignin sulfonate having an organic sulfur content of
2.4% is added to 100 wt% of fibers. , A papermaking diaphragm was produced.
[0031]
(Example 3) A papermaking diaphragm was produced in the same manner as in Example 2
except that sodium lignin sulfonate having an organic sulfur content of 2.4% was added to 20
wt% relative to 100 wt% of fibers.
[0032]
(Example 4) A papermaking diaphragm was prepared in the same manner as in Example 2 except
that 80 wt% of the digested bamboo pulp of Example 2 and 20 wt% of bamboo fibers with a BET
specific surface area of 2.1 m <2> / g were used.
[0033]
(Example 5) Japanese bamboo shoots were treated in a 10% NaOH solution at 0.5 MPa and 180
° C. for 1 hour.
After making a 16 cm papermaking diaphragm using the treated fibers, the treated black liquor
is formulated to 5% solids with warm water at 80 ° C and spray applied to both sides of the
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papermaking diaphragm for 1 hour at 100 ° C. It was dry.
The weight of the paper making diaphragm was about 1.3 times by spray application.
[0034]
Comparative Example 1 A papermaking diaphragm was produced in the same manner as in
Example 1 except that sodium lignin sulfonate was not added.
[0035]
Comparative Example 2 A papermaking diaphragm was produced in the same manner as in
Example 4 except that sodium lignin sulfonate was not added.
[0036]
Seven types of diaphragms of Examples 1 to 5 and Comparative Examples 1 and 2 were
incorporated into a speaker, and the following items were subjected to audition evaluation by five
persons.
[0037]
(Evaluation items) (1) Growth of high-pitched sound range (each 5 points full score) (2) loudness
of sound (1 point when you felt most vividly, 5 points each)
[0038]
[0039]
(Results) The speaker diaphragm of the present invention can provide a timbre in which the loud
feeling of the sound is suppressed even if it is a rigid diaphragm excellent in the extension of the
high range as in Example 4, for example. .
[0040]
From the above experimental results, the speaker diaphragm of the present invention is a rigid
diaphragm and a wide regeneration zone by adding or surface-coating at least one of kraft lignin
or lignin sulfonate and acting as a binder between fibers. It is possible to realize an excellent
speaker diaphragm capable of reproducing a mellow timbre in which the loud feeling of the
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sound is suppressed in sound quality while securing the.
[0041]
Further, the toughness of the diaphragm is improved, and the diaphragm can be made excellent
in quality and reliability.
[0042]
Furthermore, the present invention can provide an inexpensive and environmentally friendly
speaker diaphragm.
[0043]
Second Embodiment The invention according to the fourth aspect of the present invention will be
described below with reference to a second embodiment.
[0044]
FIG. 2 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
[0045]
As shown in FIG. 2, the magnetized magnet 21 is sandwiched between the upper plate 22 and the
yoke 23 to form an internal magnetic circuit 24.
[0046]
The frame 26 is coupled to the yoke 23 of the magnetic circuit 24.
The outer periphery of the diaphragm 27 according to any one of claims 1 to 3 is bonded to the
peripheral portion of the frame 26 via an edge 29.
[0047]
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.
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[0048]
Although the above has described the speaker having the internal magnet type magnetic circuit
24, the present invention is not limited to this, and may be applied to a speaker having the
external magnet type magnetic circuit.
[0049]
Furthermore, it is also possible to apply to a small speaker in which the diaphragm 27 and the
edge 29 are integrated.
[0050]
With this configuration, as described in the first embodiment, an excellent speaker capable of
reproducing a mellow timbre with suppressed loud feeling in sound quality while realizing a wide
reproduction band with a rigid diaphragm is realized. can do.
[0051]
Furthermore, since the present invention uses a rigid and strong diaphragm, it is possible to
improve the input resistance of the speaker and improve various reliability represented by
humidity resistance reliability, etc., so that the quality and reliability thereof. It is possible to
provide a speaker which is excellent in terms of cost, inexpensive and environmentally friendly.
[0052]
The speaker diaphragm and the speaker according to the present invention can be applied to
electronic devices such as video and audio equipment and information communication
equipment which require good reproduction of sound quality while securing a wide reproduction
band.
[0053]
Cross-sectional view of loudspeaker diaphragm in one embodiment of the present invention
Cross-sectional view of loudspeaker in one embodiment of the present invention
Explanation of sign
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[0054]
21 magnet 22 upper plate 23 yoke 24 magnetic circuit 25 magnetic gap 26 frame 27 diaphragm
28 voice coil 29 edge
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