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JP2010206340

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2010206340
The present invention relates to a speaker diaphragm for use in an audio device, a speaker using
the same, and an electronic device and apparatus using the speaker. . According to the present
invention, rigidity of a diaphragm is improved by mixing materials in which natural fibers and
carbonized bamboo material are mixed, and making paper, and improvement of sound quality of
a speaker using this diaphragm, earth An environmentally friendly papermaking diaphragm can
be provided. [Selected figure] Figure 1
Speaker diaphragm, speaker using the same, electronic apparatus and apparatus using the
speaker
[0001]
The present invention relates to a speaker diaphragm used for various audio devices and video
devices, and electronic devices and devices such as speakers, stereo sets, and television sets
using the same.
[0002]
The prior art will be described with reference to FIG.
[0003]
FIG. 6 is a cross-sectional view of a conventional papermaking diaphragm.
[0004]
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1
As shown in FIG. 6, the speaker diaphragm 31 is made of natural cellulose (such as paper) such
as softwood.
[0005]
Besides this, non-wood fibers such as bamboo are also used from the viewpoint of low
environmental impact.
[0006]
In addition, mica, calcium carbonate, carbon fiber, etc. are added to adjust physical property
values as a diaphragm, that is, to adjust sound quality as a speaker, and adjust physical property
values, and adjust characteristics as a speaker and sound quality. There is.
[0007]
Furthermore, in the viewpoint of low environmental impact, natural fibers are refined to
microfibrillated fibers, and the degree of freedom of physical property adjustment is improved.
[0008]
In addition, as prior art document information regarding the invention of this application, patent
documents 1, 2 and patent document 3 are known, for example.
JP-A-4-368098 JP-A-2004-23509 JP-A-2007-221635
[0009]
With respect to recent audio devices, video devices, and devices such as automobiles equipped
with these devices, performance has been dramatically improved in comparison with
conventional devices due to remarkable advances in digital technology.
[0010]
With regard to the sound quality, low distortion, wide band, high dynamic range and further
realism have been achieved, and with regard to images also, remarkable performance
improvement has been achieved by the high definition and the appearance and spread of large
modules such as plasma displays. .
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2
[0011]
Therefore, with the above-mentioned performance improvement of the electronic device, the
performance improvement of the speakers used for these electronic devices is strongly
demanded from the market.
[0012]
On the other hand, 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 component parts
of the speaker.
[0013]
However, this diaphragm uses the manufacturing method by old-fashioned papermaking and the
manufacturing method by injection molding of resin and a press, and therefore, the paper
diaphragm or the resin diaphragm was the center.
[0014]
For this reason, these diaphragms have been used properly according to their applications while
making use of their respective features, but each has drawbacks and has not met the
aforementioned market requirements.
[0015]
That is, in the case of the paper diaphragm, physical property values of the diaphragm can be set
finely, and there is an advantage that the characteristics as a speaker and the freedom of
adjusting the sound quality become large, but in terms of moisture resistance and strength which
are defects unique to paper. It is inferior.
[0016]
On the other hand, some measures have been taken such as mixing of natural fibers refined to
microfibrillated state, but while the strength is improved, it may result in an increase in specific
gravity and a sufficient sound pressure can not be obtained. .
[0017]
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3
Moreover, although the device which mixed inorganic fillers, such as carbon fiber and charcoal,
was also carried out, since carbon fiber and a natural fiber do not hydrogen-bond, they do not
function effectively as a reinforcing material.
[0018]
An object of the present invention is to solve the above-mentioned problems, and to provide a
speaker diaphragm in which characteristics as a speaker and freedom of adjustment of sound
quality are large and lightness and strength can be secured.
[0019]
In order to achieve the above object, according to the present invention, a material in which
natural fibers and carbonized bamboo material are mixed is paper-made to constitute a speaker
diaphragm.
[0020]
According to this configuration, it is possible to efficiently exhibit the high rigidity of the
carbonized bamboo material to the papermaking diaphragm while maintaining a sufficient
internal loss as compared to other inorganic fillers.
[0021]
As described above, according to the present invention, the carbonized bamboo material and the
natural fiber are mixed and paper-made to constitute the speaker diaphragm.
[0022]
According to this configuration, carbonization of the bamboo material further hardens it, leading
to high rigidity of the diaphragm, and sound quality can be improved.
[0023]
In addition, a wide range of products can be developed, including measures to reduce the
thickness.
[0024]
In addition, high reliability such as high strength and input resistance can be achieved.
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[0025]
Furthermore, since the present invention carbonizes bamboo, which is an excellent material in
terms of growth speed and has a low environmental impact, it is possible to provide an
inexpensive and environmentally friendly papermaking diaphragm.
[0026]
In addition, by selecting the resin and reinforcement material that is a mixed material from a
wide range of materials and setting the blending ratio appropriately, high-precision
characteristics and sound quality that were not possible in the past Adjustment of the
[0027]
And there is a possibility that the variation by the combination can be set infinitely, and the
desired request can be satisfied in the characteristic making, the sound making and the design.
[0028]
Hereinafter, embodiments of the present invention will be described using the drawings.
[0029]
First Embodiment The invention according to the first to eleventh aspects of the present
invention will be described below with reference to the first embodiment.
[0030]
FIG. 1 shows a cross-sectional view of a diaphragm according to an embodiment of the present
invention, and FIG. 2 shows a plan view of a diaphragm according to an embodiment of the
present invention.
[0031]
As shown to FIG. 1 and FIG. 2, the diaphragm 1 mixes and materialates the material which mixed
natural fiber 1A and the bamboo material 1B carbonized, and is paper-made.
[0032]
Bamboo fiber is used as the natural fiber 1A of the diaphragm 1, and the bamboo fiber is
complexed with a material at least partially refined to a microfibrillated state, whereby the sound
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5
quality can be adjusted and improved.
[0033]
The carbonized bamboo material 1B can reproduce natural and bright timbre, and can suppress
dark and uniform timbre unique to resin.
[0034]
Although the example which uses bamboo fiber for natural fiber 1A is demonstrated below, you
may use non-wood pulp, such as softwood pulp, hardwood pulp, and also kenaf which belongs to
bamboo, and bagasse.
[0035]
The particle diameter of the carbonized bamboo material is preferably 30 μm or more and 100
μm or less.
[0036]
A more desirable particle size is 40 μm or more and 70 μm or less.
[0037]
If it is smaller than 40 μm, the effect of the carbonized bamboo material 1B can not be used
efficiently.
On the other hand, when it is larger than 70 μm, dispersion failure occurs and the appearance is
impaired.
[0038]
When the mixing ratio of carbonized bamboo material 1B is less than 5% by weight, the effect of
carbonized bamboo material 1B hardly appears.
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On the other hand, when the content is more than 20% by weight, the diaphragm is embrittled
and dispersion failure is caused to reduce the degree of freedom of the shape.
[0039]
The partially fibrillated bamboo fiber added as a filler material is preferably 0.2 mm or more and
3 mm or less.
By using bamboo fiber of this length, when mixed with natural fiber 1A and carbonized bamboo
material 1B and made into a paper, the effect is exhibited most efficiently, and productivity and
quality are improved.
[0040]
In addition, it is desirable that the average fiber diameter of bamboo fibers refined to a
microfibrillated state is 10 μm or less.
[0041]
Generally, when the aspect ratio (L / D), which is the ratio of the fiber length L to the fiber
diameter D, of the fibers is large, the elasticity is high, and bamboo fibers finely made into
microfibrils have a large aspect ratio, so high elasticity can be expected.
[0042]
In addition, the presence of bamboo fibers partially finely divided into microfibrils forms a
structure in which fine bamboo fibers are intertwined, and by utilizing the hardness of the
carbonized bamboo material, vibration is more effectively performed. Higher plate modulus can
be expected.
[0043]
If you want a more natural and bright tone, you may use bamboo powder for some or all of the
bamboo fibers.
[0044]
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Further, if it is desired to strengthen the diaphragm 1, add some accent to the sound, or make the
sound pressure frequency characteristic have a peak to adjust the sound quality, a reinforcing
material may be mixed.
As such a reinforcing material, mica, talc, calcium carbonate and clay can be used.
[0045]
When mica is mixed into the reinforcing material, the elastic modulus can be increased.
Talc, calcium carbonate and clay can increase internal loss.
[0046]
Moreover, the color of a diaphragm can be adjusted without reducing the elastic modulus of a
diaphragm by using the carbonized bamboo material 1B.
[0047]
By combining each of these materials, the physical property value of the diaphragm 1 can be
freely adjusted with high precision, and it becomes possible to realize predetermined
characteristics and sound quality.
[0048]
In order to realize the predetermined characteristics and sound quality, deep know-how
regarding characteristic creation and sound creation is required, but in general, it is often carried
out by the method described below.
That is, with regard to the characteristic creation and the sound creation of the speaker, it is
possible to change the parameters of the component parts to some extent, and it is possible to
approximate the predetermined characteristics and sound quality.
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[0049]
For example, it is assumed that the parameters of components other than the diaphragm 1
among the components of the speaker are fixedly fixed.
Parameters that can be varied in the diaphragm 1 are the area, the shape, the weight, the surface
thickness, and the like other than the physical property values.
[0050]
However, the area, shape, weight, and surface thickness of the diaphragm 1 are substantially
determined in the initial stage of the speaker design.
That is, the sound pressure frequency characteristics and the sound quality of the speaker are
roughly determined by the conditions other than the physical property value of the diaphragm 1.
[0051]
In this case, unnecessary peaks and dips occur on the sound pressure frequency characteristics,
and distortion often occurs in a specific frequency band.
Further, with regard to the sound quality, the timbre is largely influenced by the sound pressure
frequency characteristic.
[0052]
These causes are caused by the area, shape, weight, and surface thickness of the diaphragm 1,
and in particular, in many cases due to the vibration mode of the diaphragm 1.
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9
When selecting a diaphragm material to improve such unnecessary peaks, dips and distortions
and obtain a good sound quality, the following procedure can be taken.
[0053]
First, bamboo fiber 1A, carbonized bamboo material 1B, at least partially made fine to
microfibrillated material was considered to be able to satisfy sound pressure frequency
characteristics, sound quality, and reliability grade required for the speaker. It is selected as
bamboo fiber 1C and other mixed materials.
[0054]
And each material is selected about the unnecessary peak and dip on the sound pressure
frequency characteristic to delete.
In the case of the dip countermeasure, a natural fiber having resonance at the frequency is
selected, and in the case of the peak countermeasure, a material having an internal loss at the
frequency is selected.
With regard to this material selection, for the bamboo fiber 1A, carbonized bamboo material 1B,
bamboo fiber 1C at least partially finely divided to the microfibrillated state, and other mixed
materials, density, elastic modulus, internal loss, tone specific to the material It selects,
considering the resonance frequency etc. when it shape | molds into the shape of the diaphragm
1. FIG.
[0055]
Then, the selected materials are mixed, and paper making is performed to obtain the diaphragm
1.
[0056]
The physical property values and the like of the diaphragm 1 obtained in this manner are
measured and evaluated.
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In addition, a speaker is made on a trial basis using the diaphragm 1, and the characteristics and
sound quality are actually measured, and further auditioned and finally evaluated.
[0057]
If the evaluation does not provide the desired characteristics and sound quality, this trial
production process is repeated many times.
And in that, we will improve the material selection and their blending ratio, and will gradually
approach the target characteristics and sound quality.
[0058]
By repeating the process as described above, it is possible to complete the diaphragm 1 which
can satisfy predetermined characteristics and sound quality or is very close.
[0059]
In addition, bamboo fiber is suitable for a papermaking diaphragm because it has low
environmental load and high rigidity, but the present invention is not limited to this papermaking
material, and can be used properly according to its desired characteristic value.
[0060]
For example, it is also possible to use softwood pulp, hardwood pulp, or even non-wood pulp
such as kenaf or bagasse.
[0061]
As described above, according to the present invention, by forming a diaphragm for a speaker by
injection molding a material in which carbonized bamboo material and resin are mixed, the
degree of freedom in setting physical property values of the diaphragm is increased, particularly
carbonization. It is possible to obtain a diaphragm that secures high internal loss, is excellent in
strength, and can improve productivity and dimensional stability while making use of the high
elastic modulus that is the feature of the bamboo material.
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11
[0062]
Second Embodiment The invention according to the twelfth aspect of the present invention will
be described below with reference to a second embodiment.
[0063]
FIG. 3 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
[0064]
As shown in FIG. 3, the magnetized magnet 2 is sandwiched between the upper plate 3 and the
yoke 4 to constitute an internal magnetic circuit 5.
[0065]
The frame 7 is coupled to the yoke 4 of the magnetic circuit 5.
The outer periphery of any one of the diaphragms 1 according to claims 1 to 11 is bonded to the
peripheral portion of the frame 7 through an edge 9.
Then, one end of the voice coil 8 is coupled to the central portion of the diaphragm 1, and the
other end is coupled to be fitted into the magnetic gap 6 of the magnetic circuit 5.
[0066]
Although the above has described the speaker having the internal magnetic type magnetic circuit
5, the present invention is not limited to this, and may be applied to a speaker having the
external magnetic type magnetic circuit.
[0067]
With this configuration, as described in Embodiment 1, the degree of freedom in adjusting the
characteristics and sound quality is large, the moisture resistance reliability and strength can be
ensured, and a speaker with excellent appearance and high productivity can be realized. .
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[0068]
Third Embodiment The invention according to the thirteenth aspect of the present invention will
be described below with reference to a third embodiment.
[0069]
FIG. 4 is an external view of an audio mini-component system which is an electronic device
according to an embodiment of the present invention.
[0070]
The speaker 10 is incorporated in the enclosure 11 to constitute a speaker system 21.
The amplifier 12 includes an amplification circuit of an electrical signal to be input to the
speaker system 21.
The operation unit 13 such as a player outputs the source input to the amplifier 12.
Thus, the audio mini-component system 14 which is an electronic device includes the amplifier
12, the operation unit 13, and the speaker system 21.
The amplifier 12, the operation unit 13, and the enclosure 11 are main parts of the mini
component system 14.
That is, the speaker 10 is mounted on the main body of the mini component system 14.
Further, the voice coil 8 of the speaker 10 is supplied with power from the amplifier 12 of the
main body and emits sound from the diaphragm 1.
[0071]
With this configuration, it is possible to obtain a mini component system 14 which enables high-
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13
precision characteristics, sound and design that could not be realized conventionally.
[0072]
In addition, although the mini component system 14 for audio was demonstrated as an
application to the apparatus of the speaker 10, it is not limited to this.
Applications to portable portable audio devices and their charging systems are also possible.
Furthermore, the present invention can be widely applied to and developed in electronic devices
such as image devices such as liquid crystal televisions and plasma display televisions,
information communication devices such as mobile phones, and computer related devices.
[0073]
Fourth Embodiment The fourth embodiment of the present invention will be described in the
following.
[0074]
FIG. 5 shows a cross-sectional view of an automobile 15 which is an apparatus of an embodiment
of the present invention.
[0075]
As shown in FIG. 5, the speaker 10 of the present invention is incorporated in a rear tray or a
front panel and used as a part of a car navigation system or a car audio system to constitute an
automobile 15.
[0076]
By adopting this configuration, it is possible to improve the degree of freedom in acoustic design
of a device such as an automobile equipped with the speaker 10 by designing characteristics,
making sound and designing with high accuracy utilizing the features of the speaker 10. .
[0077]
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The speaker diaphragm, the speaker, the electronic device, and the device according to the
present invention can be applied to an electronic device such as an audiovisual device and an
information communication device which needs to produce characteristics with high accuracy
and sound, and further to a device such as an automobile.
[0078]
Cross-sectional view of speaker diaphragm in one embodiment of the present invention Top view
of diaphragm for speaker in one embodiment of the present invention Cross-sectional view of
speaker in one embodiment of the present invention in one embodiment of the present invention
External view of electronic device Cross-sectional view of device according to one embodiment of
the present invention Cross-sectional view of a conventional speaker
[0079]
DESCRIPTION OF SYMBOLS 1 diaphragm 1A natural fiber 1B carbonized bamboo material 1C
micro fibril bamboo fiber 2 magnet 3 upper plate 4 yoke 5 magnetic circuit 6 magnetic gap 7
frame 8 voice coil 9 edge 10 speaker 11 enclosure 14 amplifier 13 player 14 mini component
system 15 automobile
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