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JP2007221636

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007221636
The present invention relates to a dust cap for a speaker, a speaker, an electronic device and a
device used for an audio device, and an object of the present invention is to improve the clarity
such as the improvement of sound quality and the improvement of sound pressure level in high
frequency range. The According to the present invention, a dust cap for a speaker is formed by
making a paper into a paper dust cap including a material in which the beating degree of bamboo
fiber obtained from bamboo having a bamboo age of 1 year or more is reduced to a microfibril
state. The rigidity can be improved, and the clarity of the sound quality of the speaker using the
dust cap and the sound pressure level in the high range can be improved. [Selected figure] Figure
1
Loudspeaker dust cap, speaker using the same, and electronic apparatus and apparatus using the
speaker
[0001]
The present invention relates to a speaker dust cap used for various audio devices and video
devices, and a speaker, an electronic device such as a stereo set and a television set using the
same, and an apparatus such as an automobile.
[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 the speakers.
[0003]
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1
The trend for speakers in these industries is to improve sound quality, reduce weight, and be
environmentally friendly.
[0004]
In high sound quality, in order to realize sound quality requirements which are user needs, it is
urgently necessary to develop a diaphragm and a dust cap which are components of a speaker
with a high weight for determining the sound quality.
[0005]
The development of the diaphragm and the dust cap has been advanced mainly on the
papermaking type because it has the advantage of being able to control the sound quality with
higher accuracy.
[0006]
Pulp, which is a material used for these papermaking types, has conventionally used kraft pulp
obtained from softwood through a beating process, and is in a state of spurring a shortage of
softwood.
[0007]
Therefore, in the future, the use of environmentally friendly materials has become essential.
[0008]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
Unexamined-Japanese-Patent No. 2000-324591
[0009]
A papermaking dust cap mainly made of a paper dust cap using kraft pulp obtained from
softwood tends to be generally lower in rigidity in terms of its material as compared to a dust cap
composed of a metal material or a resin material The
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2
[0010]
For this reason, it is difficult to improve the rigidity of conventional paper dust caps, and a
speaker using this dust cap is one of high sound quality, such as high clarity reproduction, large
output, and high reliability. It had the subject of being disadvantageous to sexualization.
[0011]
The present invention is intended to solve the above-mentioned problems, to improve the
material rigidity of the dust cap, to achieve high sound quality as a speaker, and to provide a
speaker dust cap capable of achieving large output and high reliability. It is
[0012]
In order to achieve the above object, the present invention comprises a material in which the
beating degree of bamboo fiber obtained from bamboo at least one year or more of bamboo age
is reduced to a microfibrillated state to construct a speaker dust cap It is.
[0013]
By adopting this configuration, it is possible to make bamboo fiber, which has been grown for
more than one year, and which has been grown and obtained from bamboo having rigidity and
toughness, to be made into paper by reducing its beating degree to a microfibril state. The
entanglement with the material can be improved to provide the speaker dust cap with sufficient
rigidity and toughness.
[0014]
Thus, the material properties of the speaker dust cap can be improved, and the rigidity and the
Young's modulus can be improved.
[0015]
As described above, according to the present invention, a dust cap for a speaker is constructed by
making a paper by including a material in which the beating degree of bamboo fiber obtained
from a grown bamboo has been reduced to a microfibrillated state after one or more years of
bamboo age. Therefore, the rigidity and toughness of the dust cap and the Young's modulus can
be improved, the sound quality of the speaker using this dust cap can be improved, and the
output can be increased and the reliability can be improved.
10-05-2019
3
[0016]
Furthermore, the present invention can provide a papermaking dust cap for a speaker that is
inexpensive and environmentally friendly.
[0017]
At present, materials used as papermaking dust caps for speakers are mainly softwood, which is
a state that spurs the world's lack of softwood.
[0018]
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.
[0019]
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. Comes to have stable physical properties.
[0020]
Therefore, it has an advantage that its growth rate is orders of magnitude faster than that of
conifers, and can be used for food and the like as soon as it is born.
[0021]
Furthermore, it has the advantage that the original bamboo grove is regenerated immediately
after logging, which does not lead to a situation that adversely affects the global environment like
coniferous forest stalking.
[0022]
Rather, it would be desirable for the global environment to harvest bamboo forests that have
grown too much and eliminate bamboo damage.
[0023]
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
10-05-2019
4
softness and ease of processing. It was often used for the direction.
[0024]
However, with regard to the grown bamboo, which has high rigidity for more than one year of
bamboo age, because of its difficulty in processing due to its rigidity, its usage can only be found
in some building materials and bamboo work, etc. Application development was urgent.
[0025]
As for the application to the papermaking member for the speaker, although it is dealt with the
ones of silkworms and juveniles within 1 year of bamboo age because of the ease of
disentanglement of bamboo fiber, although it has some effect, it is for speakers It did not reach to
the center of the papermaking member.
[0026]
The reason for this is that in order to bring out the characteristics of the original bamboo fiber, it
is more than one year old in bamboo age and more than one year in bamboo age and soft and
easy to process. Although it is effective to use a grown bamboo fiber having toughness, it is
technically difficult to disintegrate the grown bamboo fiber well, so a dust that can take
advantage of the original characteristics of bamboo fiber This is because the cap could not be
produced and the trend could not satisfy the sound quality requirements.
[0027]
However, due to global environmental problems such as desertification due to the recent
shortage of conifers, development of fibers to replace conifers has been a problem.
[0028]
In addition, with regard to papermaking technology, a new material beating technology has been
developed, and it has become possible to form a paper into a dust cap that makes use of its
features, even for materials that were considered difficult in the past.
[0029]
From the above background, an embodiment of the present invention will be described below
with reference to the drawings, mainly using bamboo fiber which has been aged for one year or
more and has grown.
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5
[0030]
First Embodiment The first to tenth aspects of the present invention will be particularly described
with reference to the first embodiment.
[0031]
FIG. 1 is a cross-sectional view of a speaker dust cap according to an embodiment of the present
invention.
[0032]
As shown in FIG. 1, the reference numeral 30 is a paper including the material in which the
beating degree of bamboo fiber obtained from bamboo having a bamboo age of 1 year or more is
reduced to a microfibrillated state to form a speaker dust cap.
[0033]
Here, in microfibrillation, it is preferable that the average fiber diameter be smaller than 5 μm,
and further that L / D (average fiber length / average fiber diameter) be 10 or more.
[0034]
The average fiber diameter of microfibrillation is preferably smaller, and by making it smaller, it
is possible to improve the entanglement of the fibers.
[0035]
Further, L / D (average fiber length / average fiber diameter) is also preferably larger, and by
making it larger, it becomes possible to improve the entanglement of the fibers.
[0036]
The time required for the beating is long, but if the beating degree is set to 1 μm or less of the
average fiber diameter or 500 nm or less, a larger effect can be exhibited.
[0037]
When the average fiber diameter is larger than 5 μm, it is possible to give the speaker dust cap
a feature as a bamboo fiber, but the power for strengthening the fiber entanglement tends to be
insufficient.
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[0038]
Bamboo fibers having a bamboo age of one year or more have grown and have rigidity and
toughness, and are compatible with paper pulp, and the rigidity, toughness and Young's modulus
of the dust cap can be improved.
[0039]
Since this bamboo fiber is structured to be finely beaten to a microfibrillated state for
papermaking, entanglement with paper pulp can be further improved, the dust cap can be
provided with sufficient rigidity and toughness, and Young's modulus can be improved. .
[0040]
The bamboo fiber referred to here is not particularly limited as long as it is a bamboo family
plant, and it is sufficient if it is a grown bamboo having a bamboo age of 1 year or more,
excluding those of the bamboo age of 1 year or less and the juvenile level.
[0041]
With regard to bamboo age, although the minimum rigidity and toughness required for the
present invention can be secured over 1 year or more, rigidity and toughness can be further
improved if 2 years or more, and 3 years or more If it has elapsed, the rigidity and toughness will
be further improved.
[0042]
As for the bamboo age, as mentioned above, it is more preferable that the bamboo age is larger,
except for the condition of aging and decay.
[0043]
And, as a sound quality feature, the sound pressure level in the high range can be improved, and
a clear and powerful sound quality can be obtained in the high range.
[0044]
On the other hand, even in the low-pitch range, it is possible to reproduce a good deep bass.
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7
[0045]
As a whole, the sound quality can be good with a high definition and well-defined sound image
localization.
[0046]
Furthermore, as another effect, compared with a dust cap made of paper pulp alone, the
toughness of the dust cap is improved, and the dust cap can be made excellent in quality and
reliability.
[0047]
Therefore, it is possible to improve the high input resistance of the speaker using the dust cap
and various kinds of reliability represented by humidity resistance reliability which is important
as a car speaker.
[0048]
Therefore, high sound quality of the speaker using this dust cap can be achieved, and high output
and high reliability can be achieved.
[0049]
Furthermore, the present invention can provide a papermaking dust cap for a speaker that is
inexpensive and environmentally friendly.
[0050]
In addition, this speaker dust cap can further exhibit the original features of bamboo fiber by
mixing it with a bamboo fiber material having an increased degree of beating.
[0051]
Here, it is preferable that the bamboo fiber material in which the degree of beating is increased
has an average fiber diameter of 5 μm to 30 μm.
[0052]
Furthermore, by including 40 wt% or more of bamboo fibers having an average fiber diameter of
5 μm to 30 μm, the original performance of bamboo fibers can be remarkably exhibited.
10-05-2019
8
[0053]
Here, when the average fiber diameter is smaller than 5 μm, the above-mentioned
microfibrillated state is obtained, which is very expensive.
[0054]
Moreover, when it becomes larger than 30 micrometers, it becomes difficult to exhibit the
original feature of bamboo fiber.
[0055]
Similarly, if the content ratio of bamboo fiber is less than 40 wt%, it is difficult to exhibit the
original features of bamboo fiber.
[0056]
Furthermore, even if a material other than bamboo fiber is included, by combining with a
material in which the degree of beating of bamboo fiber is reduced to a microfibrillated state,
bonding strength is enhanced and the characteristics of bamboo fiber can be exhibited.
[0057]
Of course, it may be mixed with a softwood which is the main material of a conventional
papermaking dust cap, and the bonding strength is enhanced and the characteristics of bamboo
fiber can be exhibited.
[0058]
When it contains materials other than bamboo fiber, the performance intrinsic | native to
bamboo fiber can be exhibited notably by comprising so that 40 wt% or more of bamboo fiber
may be included.
[0059]
And, for microfibrillated bamboo fibers having an average fiber diameter of less than 5 μm,
entanglement with other materials is improved by setting the content to 0.5 wt% or more and 20
wt% or less, and the bonding strength between the materials is determined. The physical
property value of the dust cap containing bamboo fiber can be made better.
10-05-2019
9
[0060]
Here, if the amount of microfibrillated bamboo fibers having an average fiber diameter of less
than 5 μm is less than 0.5 wt%, the inherent bonding strength is not exhibited, while if it is more
than 20 wt%, the cost is extremely high. Become.
[0061]
The material of the diaphragm has been described above. Next, the additive of the dust cap will
be described.
[0062]
Hereinafter, the inventions according to claims 11 to 18 will be described.
[0063]
Examples of additives suitable for bamboo fiber-containing dust caps include polylactic acid, raw
rubber, polyvinyl alcohol and the like, and the addition of these additives makes it possible to
exhibit the original properties of bamboo fiber remarkably.
[0064]
Polylactic acid and polyvinyl alcohol have good compatibility with bamboo fiber cellulose and are
easily fixed on the surface of bamboo fiber.
[0065]
In addition, since the internal loss can be increased, the frequency characteristics of the speaker
can be improved.
[0066]
In particular, polylactic acid is a biodegradable plastic, and a dust cap composed of bamboo
fibers and polylactic acid can be an environmental harmonized dust cap and can be used as a
paper dust cap for a speaker that is environmentally friendly.
[0067]
Here, by setting the content of polylactic acid to 1 wt% or more and 20 wt% or less, a large effect
can be exhibited.
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10
[0068]
If the polylactic acid content is less than 1 wt%, it is difficult to exhibit the original ability to fix
bamboo fibers, while if it is more than 20 wt%, the cost is extremely high.
[0069]
On the other hand, polyvinyl alcohol can exhibit a large effect by setting it as content of 2 wt% or
more and 8 wt% or less.
[0070]
When the polyvinyl alcohol is less than 2 wt%, the inherent fixing power to bamboo fiber is
difficult to be exhibited, while when it is more than 8 wt%, the cost is extremely high.
[0071]
The raw rubber also has an effect of increasing the internal loss, so that the frequency
characteristics of the speaker can be made favorable, the distortion can be reduced, and the
sound quality can be made favorable.
[0072]
As mentioned above, although the additive of a dust cap was demonstrated, coloring of a dust
cap is demonstrated next.
[0073]
The dust cap is colored in various colors depending on the design requirements, etc., but the
coloring agent is generally colored using a pigment or a dye.
[0074]
However, many pigments and dyes generally used reduce the physical properties of the dust cap
for speakers.
[0075]
For this reason, although the design can be improved, the frequency characteristics as a speaker,
the low distortion, and the sound quality are often sacrificed.
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11
[0076]
In addition, many colorants containing components that are environmentally unfriendly are also
present, and have also spurred environmental pollution.
[0077]
As for the color for performing coloring as a speaker dust cap, generally there are many blackish
colors.
[0078]
On the other hand, bamboo fiber generally has many pale yellowish colors, pale brownish colors,
and pale greenish colors, and can give a favorable impression on the design in terms of earth
color and natural color.
[0079]
In addition, finishing to a pale color such as yellowish color rather than a dark color such as
blackish color can more beautifully appeal the presence, and can improve the appearance quality.
[0080]
Furthermore, even with respect to temporal change after coloring, since the color is close to the
original color, it is difficult to discolor, and a stable appearance can be maintained for a long
time.
[0081]
As described above, since the speaker dust cap can be light in color, such as yellowish color,
among the many color darker speaker dust caps, the dust cap can be designed with high impact
in design. .
[0082]
Therefore, in the speaker of some high-class goods class called a premium model, a color appeal
can be realized.
[0083]
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12
And time and material concerning a coloring process can be deleted, and it becomes possible to
attain cost reduction as a dust cap for speakers.
[0084]
Furthermore, since various defects related to coloring do not occur, it can also contribute to
quality improvement.
[0085]
Therefore, by setting it as the dust cap which does not use a coloring agent, the original color
and performance of bamboo fiber can be exhibited notably.
[0086]
Further, among the colorants, the effect of reducing the physical property value of the pigment
as a dust cap for a speaker is large, so that the color and performance inherent to bamboo fiber
can be remarkably exhibited by using a dust cap that does not use a pigment. Can.
[0087]
As described above, by using a dust cap that does not use a colorant, particularly a pigment, the
physical property value as a dust cap can be maintained, and the occurrence of defects related to
coloring can be eliminated, and appearance defects such as discoloration and decoloring can be
reduced. It is possible to appeal the design of the original color of bamboo fiber.
[0088]
Therefore, while being able to appeal the original color feature and environmental feature of
bamboo fiber, it can be made to exhibit notably, without deteriorating the original performance
of bamboo fiber.
[0089]
Furthermore, when the lignin content in bamboo fiber is 6% or more and 15% or less, the abovementioned features can be exhibited in a good state.
[0090]
For this reason, bamboo fiber is usually formed from about 45% cellulose, about 25%
hemicellulose, and about 25% lignin originally.
10-05-2019
13
[0091]
However, it usually falls below 5% during pulping such as chemical digestion.
[0092]
When the lignin content is less than 6%, the goodness of bamboo fiber stiffness is lost.
[0093]
On the other hand, if it is more than 15%, the dispersibility in the beating process before
papermaking will be poor, and the fixability when using a sizing agent will be worse.
[0094]
The measurement of lignin content here is a value in a well-known sulfuric acid method.
[0095]
The dust cap of the present invention does not limit the use of known pigments, dyes, sizing
agents, paper strengthening agents and the like.
[0096]
In the above, the speaker dust cap by paper forming has been described, but for paper making,
not only when the shape of the dust cap is directly formed, but also one bamboo fiber sheet is
paper-formed and this sheet is press-formed A method of forming the shape of the dust cap may
be used.
[0097]
Second Embodiment The invention according to the nineteenth to twenty-first aspects of the
present invention will be described below with reference to a second embodiment.
[0098]
FIG. 2 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
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14
[0099]
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.
[0100]
The frame 26 is coupled to the yoke 23 of the magnetic circuit 24.
The outer periphery of the diaphragm 27 is bonded to the peripheral portion of the frame 26 via
an edge 29.
[0101]
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.
[0102]
The dust cap 30 according to any one of claims 1 to 18 is adhered to the front surface portion of
the diaphragm 27.
[0103]
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.
[0104]
Furthermore, it is also possible to apply to a small speaker in which the diaphragm 27 and the
edge 29 are integrated.
[0105]
With this configuration, as described in the first embodiment, the sound pressure level in the
high sound range can be improved by configuring the speaker using the dust cap having
sufficient rigidity and toughness, and the high sound range can be obtained. Can get clear and
powerful sound quality.
10-05-2019
15
[0106]
And, even in the low frequency range, it is possible to reproduce a good deep bass.
[0107]
As a whole, the sound quality can be good with a high definition and well-defined sound image
localization.
[0108]
Furthermore, it is possible to realize a tone that reduces the sense of distortion.
[0109]
As described above, the dust cap containing bamboo fiber according to the present invention is a
natural material as well as the material consisting of softwood which has conventionally been the
main body as a papermaking dust cap, and the natural material has good ear contact and basic
properties. It is possible to create sounds that make use of good timbre.
[0110]
In addition, it is possible to realize a straightforward and natural sound creation without being
dominated by the unique tone-like character such as the synthetic material or the metal material
or the uniformity of the timbre by the unique resonance.
[0111]
Therefore, the present invention can be widely applied to the production of sound of speakers in
any and all fields without selecting the field for supplying the speakers.
[0112]
As another effect, compared with a dust cap made of paper pulp alone, the toughness of the dust
cap is improved, and the dust cap can be made excellent also in terms of quality and reliability.
[0113]
Therefore, it is possible to improve the high input resistance of the speaker using this dust cap
and various reliability represented by the moisture resistance reliability that is important as a car
10-05-2019
16
speaker, and also to be beautiful in appearance and difficult to discolor. , Can maintain a stable
appearance in the long term.
[0114]
Therefore, it is possible to make the speaker excellent in quality and reliability.
[0115]
In addition, environmental and cost can be greatly contributed.
[0116]
Furthermore, as in the invention according to claim 21, not only for the dust cap but also for the
diaphragm, a material in which the beating degree of bamboo fiber obtained from bamboo
having a bamboo age of 1 year or more is reduced to a microfibrillated state is included. The
following effects can be obtained particularly by using the diaphragm made of paper.
[0117]
In this case, both the dust cap and the diaphragm are bamboo fiber materials, and the rather low
regeneration zone received by the diaphragm and the relatively high regeneration zone received
by the dust cap are made of the same bamboo fiber material Therefore, it is possible to realize a
natural and good sound quality with little change in timbre in the whole range from the low
range to the high range.
[0118]
Third Embodiment The third and fourth embodiments of the present invention will be described
in the following.
[0119]
FIG. 3 is an external view of an audio mini-component system which is an electronic device
according to an embodiment of the present invention.
[0120]
As shown in FIG. 3, the speaker 31 of the present invention is incorporated in the enclosure 41
to constitute a speaker system, and an amplifier 42 which is a means for amplifying an electric
signal input to the speaker and a source input to the amplifier 42 And an audio mini-component
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17
system 44, which is an electronic device.
[0121]
With this configuration, it is possible to improve the sound pressure level in the high range
which can not be realized conventionally, and it is possible to realize the mini component system
for obtaining clear and powerful sound quality in the high range.
[0122]
Furthermore, it is possible to improve various types of reliability represented by high input
resistance and humidity resistance reliability, and also a speaker which is beautiful in
appearance, difficult to discolor, and can maintain a stable appearance over a long period of time
The system can be realized.
[0123]
Therefore, the mini-component system can be made excellent in quality and reliability.
[0124]
In addition, environmental and cost can be greatly contributed.
[0125]
Fourth Embodiment The fourth embodiment of the present invention will be described below
with reference to the twenty-fourth and the twenty-fifth aspects of the present invention.
[0126]
FIG. 4 shows a cross-sectional view of an automobile 50 which is a device in one embodiment of
the present invention.
[0127]
As shown in FIG. 4, the speaker 31 of the present invention is incorporated in a rear tray or a
front panel, and is used as a part of a car navigation system or a car audio system to constitute
an automobile 50.
[0128]
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18
With this configuration, the sound pressure level in the high range of the speaker 31 can be
improved, and clear and powerful sound quality can be obtained in the high range.
[0129]
Furthermore, it is possible to improve various types of reliability represented by high input
resistance and moisture resistance reliability that is important as an automotive speaker, and it is
also beautiful in appearance, and changes in color also with time after coloring It is difficult to do
and can maintain a stable appearance for a long time.
[0130]
Therefore, it can be made excellent also in terms of quality and reliability, and the performance
and quality of a device such as an automobile equipped with the speaker 30 can be improved.
[0131]
In addition, environmental and cost can be greatly contributed.
[0132]
The dust cap for a speaker, the speaker, the electronic device, and the device according to the
present invention improve the sound quality and characteristics by the high rigidity dust cap,
improve the clarity such as the sound pressure level improvement in the high sound range, and
further the good appearance and The present invention can be applied to electronic devices such
as audiovisual devices and information communication devices that require high quality and
reliability, and devices such as automobiles.
[0133]
Cross-sectional view of a speaker dust cap according to an embodiment of the present invention
Cross-sectional view of a speaker according to an embodiment of the present invention External
view of an electronic device according to an embodiment of the present invention A device
according to an embodiment of the present invention Cross section
Explanation of sign
[0134]
Reference Signs List 21 magnet 22 upper plate 23 yoke 24 magnetic circuit 25 magnetic gap 26
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frame 27 diaphragm 28 voice coil 29 edge 30 dust cap 31 speaker 41 enclosure 42 amplifier 43
player 44 mini component system 50 automobile
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