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JP2008124962

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008124962
The present invention relates to a papermaking diaphragm for a speaker used in various kinds of
audio equipment, and provides a low-quality diaphragm that is high in sound quality, earthfriendly, easy to manufacture, and low in cost. SOLUTION: The density d of the vibrating plate
and the content X of the microfibrillated fiber (wt%) in a papermaking diaphragm containing a
microfibrillated fiber having a freeness of 50 ml or more and 200 ml or less in Canadian
standard freeness In the above relationship, 10d ≦ X ≦ 40d is satisfied. [Selected figure] Figure
1
Papermaking diaphragm for speaker, speaker using the same, electronic apparatus and
apparatus using the speaker
[0001]
The present invention relates to a speaker sheet making diaphragm used in various audio
equipment and video equipment, a speaker using the same, an electronic apparatus such as a
stereo set and a television set, and an apparatus such as an automobile.
[0002]
With respect to recent electronic devices such as audio devices and video devices, performance
has been dramatically improved as compared with the past, due to remarkable advances in digital
technology.
[0003]
With the improvement of the performance of the electronic devices, the performance
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improvement of the speakers used for these electronic devices is strongly demanded from the
market.
[0004]
In the case of a speaker whose performance improvement is strongly demanded by the market, it
is indispensable to cope with the enhancement of the diaphragm which occupies a large weight
which determines the sound quality among the speaker components.
There is a large demand for high sound quality among the high performance diaphragms.
Therefore, development of a speaker diaphragm that can realize high sound quality is essential.
[0005]
Also, on the other hand, there is a strong demand from the market for a demand that hinders
higher performance, such as price reduction and response to the environment.
[0006]
Therefore, in the future, it will be essential to develop a speaker diaphragm having high sound
quality, high performance, and excellent price reduction and environmental compatibility.
[0007]
The material of the conventional speaker diaphragm is mainly obtained by beating softwood.
[0008]
Then, in order to further improve the performance, it is often used after being microfibrillated or
used together with a reinforcing agent such as polyester.
In addition, carbon fibers, glass fibers, polyester fibers, aramid fibers and the like have been used
as reinforcing agents.
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2
[0009]
Patent Document 1 is known as prior art document information related to the invention of this
application.
Unexamined-Japanese-Patent No. 4-23597
[0010]
Conifers, which are frequently used as materials for conventional speaker diaphragms for
speakers, require a very long time for the beating process.
And in order to improve performance, it took more time to microfibrillate.
[0011]
In addition, carbon fibers, glass fibers, polyester fibers, aramid fibers, etc. used as reinforcing
agents are expensive in price, and in many cases it is difficult to incinerate after use. From the
point of view of price and environment.
[0012]
Furthermore, there are numerous prior art which conventionally use microfibrillated fibers to
improve the stiffness of the diaphragm.
[0013]
However, many of them are not only conceptual, but many of them have not actually improved in
rigidity.
Also, there are overwhelmingly many cases where the definition of microfibrillation is not even
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3
made.
[0014]
In the development of speakers, most of the purpose of the diaphragm study is to reproduce the
sound well, but to reproduce the sound well means to express the physical properties of the
diaphragm at a large speed of sound, and It is to bring the internal loss in the larger direction.
[0015]
It is not the inclusion of microfibrillated fibers that determines the physical properties of these
diaphragms, but what kind of fiber entanglement form is produced when the microfibrillated
fibers are included, and it is important that the fibers are Density and fiber entanglement at that
density.
[0016]
The present invention solves the above-mentioned problems and realizes high sound quality and
high performance by improving the rigidity of the diaphragm, and aims to provide a speaker
diaphragm for a speaker which is low in price, environment-friendly, and excellent in
productivity. It is said that.
[0017]
In order to achieve the above object, the present invention uses a bamboo which has less
environmental burden than softwood, is easy to obtain and inexpensive, and which can be easily
microfibrillated and refined in a short time than softwood. The relationship between the density d
of the material fiber microfibrillated to 50 ml or more and 200 ml or less at standard freeness
and the amount X (%) of the fiber in all fibers satisfies 10 d ≦ X ≦ 40 d It is set and the
papermaking diaphragm for speakers is comprised.
[0018]
By this configuration, the microfibrillated bamboo fiber can be strongly entangled with other
materials, and the speaker diaphragm can be provided with sufficient rigidity and toughness.
[0019]
Therefore, the material physical property value of the speaker diaphragm can be improved, and
the rigidity, the Young's modulus, and the tensile strength can be improved.
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[0020]
As described above, the speaker sheet diaphragm of the present invention comprises the
microfibrillated bamboo fiber and is microfibrillated to a beating degree of 50 ml or more and
200 ml or less at Canadian standard freeness. The speaker papermaking diaphragm is configured
such that the relationship between the density d of the material fiber and the amount X (%) of the
relevant fiber in all the fibers satisfies 10d ≦ X ≦ 40d.
[0021]
With this configuration, the rigidity and toughness of the diaphragm, and the Young's modulus
can be improved, and high-quality sound can be achieved for the speaker using this diaphragm,
and large output and high reliability can be achieved.
[0022]
Furthermore, the present invention can provide a papermaking diaphragm for speakers that is
inexpensive and environmentally friendly.
[0023]
Hereinafter, embodiments of the present invention will be described.
[0024]
First Embodiment The first to seventh 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 according to an embodiment of the
present invention.
[0026]
FIG. 2 shows a cross-sectional view of a speaker according to an embodiment of the present
invention.
[0027]
First, the speaker diaphragm 27 shown in FIG. 1 will be described.
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[0028]
The present invention has reached the following conclusions as a result of intensive
investigations focusing on the material and usage of what are called fibers.
[0029]
A) To be easy to manufacture, it is necessary to be mixed paper.
[0030]
B) When the specific gravity is increased without microfibrillation, the elastic modulus of the
diaphragm is improved, but the sound velocity is less likely to be improved.
That is, by considering the entanglement of fibers, the amount of microfibrillated fibers most
effective for improving the speed of sound tends to differ depending on the specific gravity.
[0031]
C) A preferred material which can easily realize microfibrillation in a short time is bamboo fiber.
[0032]
The above a) will be described.
[0033]
It is possible to mix the fiber if it is a fiber microfibrillated to a level of 50 ml or more and 200 ml
or less according to the Canada standard freeness.
[0034]
Here, if the amount is 50 ml or less, the microfibrillated fibers are detached from the net during
mixed paper making it easy to cause variations in performance.
[0035]
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On the other hand, when it is 200 ml or more, the degree of microfibrillation is low, and it is
difficult to obtain the expected effect.
[0036]
Methods of obtaining these microfibrillated fibers include beater, sound mill and the like.
[0037]
The time required for microfibrillation is far shorter in bamboo fiber than in conventional
softwood-based fibers, and is preferable in terms of production process and cost.
[0038]
In addition, bamboo does not cause environmental problems because it grows quickly, and can
be supplied continuously, and it is environmentally friendly, such as being able to be disposed of
by incineration instead of landfilling like inorganic components such as glass fiber. preferable.
[0039]
For this reason, if the fibers which are not microfibrillated are also bamboo fibers, it becomes an
earth-friendly and preferable speaker diaphragm.
[0040]
The invention refers to the density of the diaphragm containing bamboo fibers and the content of
microfibrillated fibers.
[0041]
The reason for this is that the entangled form of the fibers is highly dependent on the density.
A form in which the microfibrillated fibers connect the non-microfibrillated fibers in a network is
effective.
[0042]
Therefore, in order to realize this form, assuming that the content of microfibrillated fibers in all
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the fibers is X (wt%), the relationship of the density d (g / cm <3>) of the diaphragm is 10d ≦ X
≦ 40d Is effective.
[0043]
If X is less than 10 d, the effect is small, and if X exceeds 40 d, the effect is leveled off or
reduced.
[0044]
Although the density of the speaker diaphragm of the present invention is not limited, it is
preferable that the specific gravity is small in that the weight of the automobile speaker is
required to be reduced and the speed of sound increases with decreasing density. 25-0.45 g / cm
<3> is preferable.
[0045]
Hereinafter, although the best mode of the present invention and an example are described as an
example of the present invention, the scope of the present invention is not limited at all.
[0046]
The best embodiment of the speaker diaphragm according to the present invention is a
diaphragm with a density of 0.25 to 0.45 g / cm <3>, and the beating degree is 50 ml to 100 ml
at Canadian standard freeness. 3 wt% to 15 wt% of bamboo fibers and about 80 wt% to 97 wt%
of bamboo fibers that are not microfibrillated, and the diaphragm is manufactured by mixing.
[0047]
As needed, sizing agents, paper strength agents, waterproofing agents, pigments and the like are
used, but the sound quality is adjusted by adding 3% to 10% of polylactic acid and / or raw
rubber, respectively.
[0048]
By adding these sound quality adjustment materials, it is possible to adjust the sound quality with
high accuracy and utilizing the characteristics of bamboo fiber.
[0049]
Next, the speaker according to the embodiment of the present invention shown in FIG. 2 will be
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described.
[0050]
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.
[0051]
The frame 26 is coupled to the yoke 23 of the magnetic circuit 24.
The outer periphery of the diaphragm 27 according to claim 1 is adhered 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.
[0052]
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.
[0053]
Furthermore, it is also possible to apply to a small speaker in which the diaphragm 27 and the
edge 29 are integrated.
[0054]
According to this configuration, due to the effect of the diaphragm as described in FIG. 1, it is
possible to reproduce a good deep bass in the low tone range and obtain a clear and bright sound
quality in the high tone range.
[0055]
And as a whole, it is possible to obtain a good sound quality with a well-defined sound image
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localization with high definition.
[0056]
As described above, the diaphragm according to the present invention is a natural material as in
the case of the material consisting of softwood which has conventionally been the main body as a
papermaking diaphragm, and the natural material has a good contact per ear and a timbre with
good character. It will be possible to make sound utilizing it.
[0057]
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.
[0058]
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.
[0059]
As another effect, the toughness of the diaphragm is improved, and the diaphragm can be made
excellent also in terms of quality and reliability.
[0060]
Therefore, it is possible to improve the high input resistance of the speaker using this diaphragm
and various types of reliability represented by the humidity resistance reliability.
[0061]
Therefore, the speaker can be excellent in quality and reliability, and can greatly contribute to
the environment and cost.
[0062]
Although the diaphragm and the speaker have been described above, experimental results will be
described below.
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[0063]
Example 1 After being beaten with a beater for 6 hours, it was treated with a mortar for 1 week
to obtain a microfibrillated wood pulp with a beating degree of 195 ml at Canadian Standard
Freeness.
[0064]
A mixture of 20 wt% of this and 80 wt% of bamboo fiber with 680 ml of Canadian standard
freeness was mixed to make a paper, and a 16 cm diameter diaphragm with a density of 0.6 g /
cm <3> was produced.
[0065]
The speed of sound was 2100 m / s.
[0066]
Example 2 After being beaten with a beater for 6 hours, it was treated with a stone mill for 10
hours to obtain 53 ml of microfibrillated bamboo fiber with a beating degree at Canadian
Standard Freeness.
[0067]
A 16 cm diameter diaphragm with a density of 0.28 g / cm <3> is mixed with a mixture of
bamboo fiber with a 680 ml of freeness at a freeness of 680 ml and a weight ratio of 2.7 / 97.3.
Was produced.
[0068]
The speed of sound was 2150 m / s.
[0069]
(Example 3) The weight ratio of Example 2 was changed to 5/95, and a 16 cm diameter
diaphragm having a density of 0.33 g / cm <3> was produced.
[0070]
The speed of sound was 2230 m / s.
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[0071]
(Example 4) The weight ratio of Example 2 was changed to 15/85, and a 16 cm diameter
diaphragm having a density of 0.33 g / cm <3> was obtained.
[0072]
The speed of sound was 2410 m / s.
[0073]
Example 5 Using the microfibrillated bamboo fiber of Example 2, a diaphragm of 16 cm diameter
having a density of 0.6 g / cm <3> at 20/80 was obtained.
[0074]
The speed of sound was 2350 m / s.
[0075]
Comparative Example 1 A 16 cm diameter diaphragm having a density of 0.6 g / cm <3> was
obtained by changing the weight ratio of Example 1 to 5/95.
[0076]
The speed of sound was 1850 m / s.
[0077]
Comparative Example 2 A 16 cm diameter diaphragm with a density of 0.3 g / cm <3> was
obtained by setting the weight ratio of Example 1 to 15/85.
[0078]
The speed of sound was 1980 m / s.
[0079]
Comparative Example 3 A 16 cm-diameter diaphragm having a density of 0.35 g / cm <3> at the
same mixing ratio as in Example 1 was obtained.
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[0080]
The speed of sound was 2030 m / s.
[0081]
Comparative Example 4 A 16 cm-diameter diaphragm having a density of 0.2 g / cm <3> at the
same mixing ratio as Comparative Example 1 was obtained.
[0082]
The speed of sound was 1750 m / s.
[0083]
(Evaluation Example) Nine types of diaphragms of Examples 1 to 5 and Comparative Examples 1
to 4 were assembled into a speaker, and the sound quality was evaluated by 10 listeners.
[0084]
We asked them to choose three types of sounds that the listener thinks were good, and counted
the number of people.
The results were as follows.
[0085]
(Example 1) 2 (Example 2) 3 (Example 3) 6 (Example 4) 9 (Example 5) 8 (Comparative Example
1) 0 (Comparative Example 2) 1 ( Comparative example 3) 1 person (comparative example 4) 0
person (effect of the invention from the example) The relationship between the density d (g / cm
<3>) of the diaphragm and the microfibrillated fiber mixed weight X (%) is 10 d The
microfibrillated fiber was effective for reinforcement and had a good sound quality in the case of
≦ X ≦ 40 d.
[0086]
When bamboo fiber is used, processing is easy and can be performed in a short time, and the
sound quality improvement effect is also large.
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[0087]
As described above, the papermaking diaphragm according to the present invention and the
speaker obtained therefrom are very useful because they can satisfy the high sound quality
required from the market.
[0088]
Moreover, compared with the mixture of glass fiber and aramid fiber, it is easy on the earth
environment, easy to manufacture and low in cost.
[0089]
The above results support the above-described effects of the diaphragm and the speaker.
[0090]
Second Embodiment The invention according to the eighth aspect of the present invention will be
described below with reference to a second embodiment.
[0091]
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.
[0092]
As shown in FIG. 3, the speaker 30 according to the present invention is incorporated in the
enclosure 41 to constitute a speaker system, and an amplifier 42 as amplification means for an
electric signal input to the speaker and a source input to the amplifier 42 An audio minicomponent system 44, which is an electronic device, is configured to include an output player
43.
[0093]
With this configuration, it is possible to realize a mini-component system for obtaining excellent
sound quality with high definition and sharp sound localization that can not be realized
conventionally.
[0094]
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Furthermore, a speaker system capable of improving various types of reliability represented by
high input resistance and humidity resistance reliability can be realized.
[0095]
Therefore, the mini-component system can be made excellent in quality and reliability.
[0096]
In addition, environmental and cost can be greatly contributed.
[0097]
Third Embodiment The invention according to the ninth aspect of the present invention will be
described below with reference to the third embodiment.
[0098]
FIG. 4 shows a cross-sectional view of an automobile 50 which is a device of an embodiment of
the present invention.
[0099]
As shown in FIG. 4, the speaker 30 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.
[0100]
With this configuration, it is possible to obtain a good and excellent sound quality of the sound
image localization with a high definition of the speaker 30 and a clear contour.
[0101]
Furthermore, it is possible to improve various kinds of reliability represented by high input
resistance and moisture resistance reliability which is important as a car speaker.
[0102]
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.
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[0103]
In addition, environmental and cost can be greatly contributed.
[0104]
The paper making diaphragm, the speaker, the electronic device and the device according to the
present invention are improved in sound quality and characteristics by the high rigidity
diaphragm, and further electronic parts such as audiovisual equipment and information
communication equipment which require high quality and reliability. The present invention can
be applied to devices and devices such as automobiles.
[0105]
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 External view of
acoustic device in one embodiment of the present invention of device in one embodiment of the
present invention Cross section
Explanation of sign
[0106]
21 magnet 22 upper plate 23 yoke 24 magnetic circuit 25 magnetic gap 26 frame 27 diaphragm
28 voice coil 29 edge 30 speaker 41 enclosure 42 amplifier 43 player 44 mini component
system 50 automobile
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