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JP2007028470

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DESCRIPTION JP2007028470
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, to improve a sound pressure
level in a high frequency range. . According to the present invention, the rigidity of a diaphragm
27 is improved by forming a diaphragm 27 for a speaker in which paper is made by
microfibrillating an aromatic polyamide, and a high-pitched range of a speaker using the
diaphragm 27. The sound pressure level can be improved. [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, a speaker using the same, an electronic device such as a stereo set and a television set,
and an apparatus such as an automobile.
[0002]
In the audio industry and the automobile industry equipped with audio devices in recent years,
the sound quality reproduced from the speakers has dramatically improved due to the spread of
digital devices.
[0003]
The next goal in these industries is how to dramatically improve the sound quality achieved by
the spread of digital devices, and how to make it possible to create sounds with user-oriented
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1
tones. This is an essential item in high-grade speakers.
[0004]
On the other hand, diaphragms, which are components with very large weights for determining
the timbre of a speaker, are increasingly used as diaphragms made of metal materials and resin
materials.
[0005]
However, diaphragms made of these metal materials and resin materials can only reproduce
uniform timbres due to their physical properties, and some high-end class speakers called
premium models It was very difficult to make sound.
[0006]
Therefore, paper-based diaphragms have been reviewed in these high-end class speakers.
[0007]
Since these paper-based diaphragms have small specific gravity and appropriate internal loss,
and can be made by mixing various materials, the timbre of the speaker can be adjusted in detail,
and various materials can be used. Examination of the method of internal filling has been carried
out for a long time.
[0008]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
Japanese Patent Application Laid-Open No. 52-117615
[0009]
A paper-based diaphragm generally has a tendency to be lower in rigidity due to the material as
compared to a diaphragm made of a metal material or a resin material.
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2
[0010]
For this reason, as in the prior art, many studies for improving the rigidity have been carried out,
such as studies in which fibers are mixed with a paper-based diaphragm.
[0011]
However, in practice, sufficient effects have not been obtained, and as material improvement,
although the rigidity improvement slightly increases, it does not come to the point that it can be
clearly effective in terms of hearing.
Therefore, the present situation is to cope with the improvement in shape design such as
improving the shape rigidity of the diaphragm.
[0012]
As described above, it is difficult for the conventional diaphragm to be improved in material
rigidity, and a speaker using this diaphragm has a problem that the sound pressure level in the
high range becomes low.
[0013]
An object of the present invention is to provide a diaphragm for a speaker which can solve the
above-mentioned problems, improve the material rigidity of the diaphragm, and improve the
sound pressure level in a high range as a speaker.
[0014]
In order to achieve the above object, the present invention is a speaker diaphragm made by
microfibrillating an aromatic polyamide in a material containing at least a paper pulp and an
aromatic polyamide.
[0015]
With this configuration, the entanglement with the paper pulp can be improved and the
diaphragm can be provided with sufficient rigidity.
[0016]
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3
As described above, according to the present invention, the rigidity of the diaphragm is improved
by making the structure of the speaker diaphragm in which the aromatic polyamide is
microfibrillated and made into paper, and the sound in the high range of the speaker using this
diaphragm is produced. The pressure level can be improved.
Thereby, clear and powerful sound quality can be obtained in the high range.
[0017]
Hereinafter, embodiments of the present invention will be described using the drawings.
[0018]
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.
[0019]
FIG. 1 is a cross-sectional view of a speaker diaphragm according to an embodiment of the
present invention.
[0020]
As shown in FIG. 1, the material of the diaphragm 27 is a material containing paper pulp and an
aromatic polyamide, and is configured as a diaphragm for a speaker in which an aromatic
polyamide is microfibrillated and paper-made.
[0021]
Here, microfibrillation means an average fiber diameter of 300 nm or less.
Furthermore, it is preferable that L / D (fiber length / fiber diameter) is 2000 or more.
[0022]
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Furthermore, if it mentions for reference, the fibrillation of the conventional diaphragm was very
large with an average fiber diameter of about 10-15 micrometers.
[0023]
The aromatic polyamide has a high elastic modulus, is compatible with the paper pulp, and can
give rigidity to the diaphragm.
[0024]
Since this aromatic polyamide is microfibrillated for papermaking, the entanglement with paper
pulp can be further improved and the diaphragm can be given sufficient rigidity.
[0025]
Therefore, the sound pressure level in the high range of the speaker using this diaphragm can be
improved, and a clear and powerful sound quality can be obtained in the high range.
[0026]
As another effect, compared with a diaphragm made of paper pulp alone, the toughness of the
diaphragm is improved, and the diaphragm can be made superior also in terms of quality and
reliability.
[0027]
Therefore, it is possible to improve the high input resistance of the speaker using this diaphragm
and various kinds of reliability represented by humidity resistance reliability which is important
as a car speaker.
[0028]
Next, the composition ratio of the microfibrillated aromatic polyamide and the mixed constitution
with the non-microfibrillated aromatic polyamide will be described.
[0029]
The microfibrillated aromatic polyamide is expensive and is limited in the amount to be packed
into paper pulp.
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5
If the microfibrillated aromatic polyamide is contained in an amount of 2% or more, that portion
can contribute to the entanglement with the paper pulp to give rigidity to the diaphragm.
[0030]
Furthermore, it is also effective to mix non-microfibrillated aromatic polyamide.
There is an aromatic polyamide fiber as a non-microfibrillated aromatic polyamide, which is
obtained by cutting a filament having an average fiber diameter of about several tens of μm into
a fixed length.
[0031]
Further, as another aromatic polyamide which is not microfibrillated, there is an aromatic
polyamide pulp, which is fibrillated like paper pulp to an average fiber diameter of about 1 μm.
This aromatic polyamide pulp is generally referred to as a synthetic fiber pulp.
[0032]
By further blending the above-described aromatic polyamide fiber and aromatic polyamide pulp,
the microfibrillated aromatic polyamide contributes to the entanglement with the paper pulp to
further enhance the bonding strength and give the diaphragm a large rigidity. be able to.
[0033]
In addition, when mixed as a mixture of aromatic polyamide fiber and aromatic polyamide pulp,
various kinds of aromatic polyamides having different average fiber diameters further increase
the bonding strength with paper pulp and give the diaphragm a greater rigidity. Can.
[0034]
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In these cases, a large effect can be obtained by blending the microfibrillated aromatic polyamide
and the non-microfibrillated aromatic polyamide with a paper pulp containing 40% or more by
weight.
On the other hand, if it becomes 40% or less, the effect of the sound pressure increase of the high
sound range will decrease.
Preferably, it is 40% to 70%, and if it is 70% or more, not only the cost becomes expensive but
also the effect of mixing becomes flat.
[0035]
Further, in the diaphragm of the present invention sufficiently reinforced with aromatic
polyamide, it is possible to expose the paper pulp to be used and maintain sufficient strength
even with kraft pulp.
[0036]
And, in the case of coloring, it is more efficient to use this bleached kraft pulp.
The color to be colored is generally a blackish color, and the blackish color can also be colored
beautifully and efficiently.
[0037]
In addition, the dark color as well as the blackish color is particularly effective for the light color.
Among them, particularly for the yellow color, the colorability is very good and the appearance
can be beautifully finished.
Also this can be colored very efficiently.
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The reason is that aromatic polyamides are originally pale yellowish in color.
Therefore, it is possible to color more beautifully and efficiently by finishing to a pale yellowish
color rather than a dark color such as a blackish color.
[0038]
Moreover, when bleached kraft pulp is used, the original aromatic polyamide color can be
beautifully obtained, and the other colors are not mixed and the whole color is not turbid, so it is
efficient in a small amount of time with a small amount of coloring agent. Color can be given.
[0039]
Furthermore, with regard to the change with time after coloring, it is difficult to discolor because
it is a color close to the original color, and a stable appearance can be maintained for a long time.
[0040]
As described above, among the speaker diaphragms with many dark colors for coloring, it is
possible to stably and efficiently color pale white colors such as yellowish colors, and so the like
in terms of design. It can be a strange diaphragm.
Therefore, in the speaker of some high-class goods class called a premium model, a color appeal
can be realized.
[0041]
Next, the best mode for carrying out the present invention will be described.
[0042]
The best mode of the present invention is 30 to 60 wt% of BKP (bleached kraft pulp) which is a
paper pulp, 2 to 7 wt% of microfibrillated aromatic polyamide, and 10 to 60 wt% of aromatic
polyamide fiber having a fiber diameter of about 10 μm. % And 10 to 30 wt% of aromatic
polyamide pulp.
10-05-2019
8
[0043]
If the amount of the aromatic polyamide pulp exceeds 30 wt%, the water loss at the time of
papermaking becomes worse, and the production efficiency is lowered.
Therefore, it is desirable to make aromatic polyamide pulp 30 wt% or less.
[0044]
Example 1 A papermaking cone was made of BKP 95% and microfibrillated aromatic polyamide
5%, and a speaker with a diameter of 14 cm was produced and subjected to audition evaluation.
[0045]
As a result, the high-pitched sound was clear and crisp.
[0046]
In addition, the sound speed at 1 Hz of the diaphragm itself was 1800 m / s, and the sound
pressure frequency characteristics were also flat.
[0047]
Example 2 A speaker was assembled in the same manner as in Example 1 except that 50% of
BKP, 3% of microfibrillated aromatic polyamide, 30% of aromatic polyamide fiber, and 17% of
aromatic polyamide pulp were used.
[0048]
As a result, the high-pitched sound produced by trial listening was clearer and crisper than in
Example 1.
The sound velocity was 2200 m / s, and the sound pressure frequency characteristics were also
flat.
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[0049]
(Comparative example 1) It implemented with 50% of BKP and 50% of aromatic polyamide fiber.
[0050]
As a result, although the high-pitched sound in the trial listening has a sound, the sound has a big
distortion as if it can be broken.
The sound velocity on measurement was 2200 m / s, and when the sound pressure frequency
characteristics were measured, there was a large dip around 10 kHz.
[0051]
(Comparative example 2) It implemented by 70% of BKP and 30% of aromatic polyamide pulp.
[0052]
As a result, in the trial listening, neither the clear feeling nor the sound of the sound was felt.
The sound velocity was 1500 m / s, and the reinforcing effect was small.
The sound pressure frequency characteristics were high in the low frequency range, but the
decrease in sound pressure was large above 10 kHz.
[0053]
Second Embodiment The invention according to the twelfth aspect of the present invention will
be described below with reference to a second embodiment.
[0054]
FIG. 2 shows a cross-sectional view of a speaker according to an embodiment of the present
invention.
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10
[0055]
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.
[0056]
The frame 26 is coupled to the yoke 23 of the magnetic circuit 24.
The outer periphery of any one of the diaphragms 27 according to claims 1 to 11 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 inner peripheral portion of the diaphragm
27, and the other end is coupled so as to be fitted into the magnetic gap 25 of the magnetic
circuit 24.
[0057]
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.
[0058]
Furthermore, it is also possible to apply to a small speaker in which the diaphragm 27 and the
edge 29 are integrated.
[0059]
With this configuration, as described in the first embodiment, the sound pressure level in the
high frequency range can be improved by configuring the speaker using the speaker diaphragm
having sufficient rigidity and toughness. Clear and powerful sound quality can be obtained in the
high range.
[0060]
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11
In addition, it can improve various reliability represented by high input resistance and humidity
resistance that is important as an automotive speaker, and it is also beautiful in appearance, and
it is difficult to be discolored even if it changes with time after coloring. Can maintain its longterm appearance.
As a result, the speaker can be excellent in quality and reliability.
[0061]
Third Embodiment The third embodiment of the present invention will be described below in
detail.
[0062]
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.
[0063]
As shown in FIG. 3, the speaker 30 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 30 and a source input to the amplifier 42 And an audio minicomponent system 44, which is an electronic device.
[0064]
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.
[0065]
Furthermore, various reliability represented by high input resistance and moisture resistance
reliability can be improved, the appearance is also beautiful, and it is difficult to discolor even
with respect to time-dependent change after coloring, and the stable appearance is long-term The
speaker system which can be held can be realized.
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12
This makes it possible to provide a mini-component system that is excellent in terms of quality
and reliability.
[0066]
Fourth Embodiment The fourth embodiment of the present invention will be described in the
following.
[0067]
FIG. 4 shows a cross-sectional view of an automobile 50 which is a device of an embodiment of
the present invention.
[0068]
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.
[0069]
With this configuration, the sound pressure level in the high range of the speaker 30 can be
improved, and clear and powerful sound quality can be obtained in the high range.
[0070]
Furthermore, various reliability represented by high input resistance and moisture resistance
reliability important as a car speaker can be improved, and it is also beautiful in appearance, and
it is hard to discolor also about a temporal change after coloring A stable appearance can be
maintained for a long time.
As a result, the quality and the reliability can be improved, and the performance and the quality
of the device such as a car equipped with the speaker 30 can be improved.
[0071]
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13
The speaker diaphragm according to the present invention, the speaker using the same, and the
electronic apparatus and apparatus using the speaker are excellent in sound quality and
characteristics, and further, the sound pressure level in the high range by the rigid diaphragm is
improved. It is useful for application to electronic equipment such as audiovisual equipment and
information communication equipment that require a good appearance, high quality and
reliability, and further to equipment such as automobiles.
[0072]
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
electronic device in one embodiment of the present invention of device in one embodiment of the
present invention Cross section
Explanation of sign
[0073]
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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