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JP2011130497

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DESCRIPTION JP2011130497
It is difficult to improve the performance of a bamboo fiber-made paper diaphragm for a speaker
utilizing the strength and elastic modulus of bamboo fiber obtained from bamboo having rigidity.
The strength and elasticity of bamboo fiber obtained from bamboo having rigidity by setting the
content of impurities inhibiting hydrogen bonding force to 1 wt% or less in a speaker diaphragm
mainly composed of bamboo fiber By securing the ratio, the material rigidity is improved, the
diaphragm is given sufficient strength and elastic modulus, and high sound quality and high
reliability as a speaker are achieved. [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]
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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1
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.
[0005]
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.
[0006]
Heretofore, with regard to the development of these speaker diaphragms, various diaphragm
materials and manufacturing methods have been developed and put into practical use by the
development in the material surface and the manufacturing process.
[0007]
Recently, the development of diaphragms using bamboo fiber as a material that can realize high
sound quality due to its rigidity and is also environmentally friendly and can be stably supplied
has been advanced.
[0008]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
[0009]
Unexamined-Japanese-Patent No. 4-23597
[0010]
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2
The material of the conventional speaker diaphragm has been digested unbleached pulp or
bleached pulp.
These digested materials usually contain 3 wt% to 6 wt% of components other than cellulose and
hemicellulose mainly composed of lignin.
However, these components other than cellulose and hemicellulose are impurities that inhibit the
rigidity increase of the papermaking diaphragm due to hydrogen bonding.
At this level of content, the amount of lignin is too small to take advantage of the characteristics
of lignin.
[0011]
From the above reasons, even if the papermaking diaphragm is manufactured, the strength is
weak, the elastic modulus is also small, and there is a problem that it is difficult to secure
sufficient performance in terms of strength and sound quality as a speaker diaphragm. The
And the above contents were the same also in the development of the diaphragm using high rigid
bamboo fiber.
[0012]
The present invention solves the above problems and improves the rigidity of the material by
securing the strength and elastic modulus of the diaphragm, and provides a speaker diaphragm
that can achieve high sound quality as a speaker and also can achieve high reliability. The
purpose is to
[0013]
In order to achieve the above object, the present invention is to develop a diaphragm material
using bamboo fiber in order to realize the improvement of the sound quality of the speaker by
the rigidity improvement of the diaphragm with a material friendly to the global environment.
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[0014]
Here, rigidity improvement is indispensable in the papermaking diaphragm.
Therefore, in the present invention, the hydrogen bonding power of cellulose and hemicellulose
components is effectively utilized as the means.
For this purpose, components other than cellulose and hemicellulose in bamboo fiber, that is,
impurities that inhibit the hydrogen bonding strength are 1 wt% or less.
[0015]
By adopting this configuration, material rigidity can be improved by securing the strength and
elastic modulus of bamboo fiber obtained from bamboo having rigidity, and sufficient strength
and elastic modulus can be given to the diaphragm, so as a speaker It is possible to achieve high
sound quality and high reliability.
[0016]
As described above, in the speaker diaphragm of the present invention, the strength and the
elastic modulus are secured by paper-making so that the impurity that inhibits the hydrogen
bonding force which is the cellulose and hemicellulose components of bamboo fiber is 1 wt% or
less. Material rigidity can be improved.
Thereby, sufficient strength and elastic modulus can be given to the diaphragm, and high sound
quality and high reliability can be achieved as the speaker.
[0017]
Furthermore, it is possible to provide an inexpensive and environmentally friendly speaker
diaphragm, and its industrial value is extremely large.
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[0018]
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
[0019]
Embodiments of the present invention will be described below using the drawings.
[0020]
First Embodiment The first to fourth aspects of the present invention will be particularly
described with reference to the first embodiment.
FIG. 1 is a cross-sectional view of a speaker diaphragm according to an embodiment of the
present invention.
[0021]
As shown in FIG. 1, the present invention relates to a diaphragm for a speaker manufactured by a
paper making method based on bamboo fiber, which contains 1 wt% of components other than
cellulose and hemicellulose in bamboo fiber, that is, impurities that inhibit hydrogen bonding. %
Or less, preferably 0.3 wt% or less.
Here, setting the components other than cellulose and hemicellulose in bamboo fiber to 0.3 wt%
or less further improves the rigidity by reducing the amount of impurities that inhibit the
hydrogen bonding strength as compared with the one having 1 wt% or less. effective.
[0022]
Further, with regard to the degree of beating of this bamboo fiber, by including 70 wt% or more
of bamboo fiber having a degree of beating of 400 ml or more and 700 ml or less, sufficient
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strength and elastic modulus can be given to the diaphragm.
Here, if the degree of beating exceeds 700 ml, the rigidity improvement effect is small, and if it is
less than 400 ml, water leakage at the time of papermaking becomes worse, which adversely
affects the productivity.
Preferably it is 500 ml or more and 600 ml or less.
[0023]
On the other hand, in the case of using as a reinforcing fiber as a reinforcing material, it is
preferable to use 5 wt% or more and 20 wt% or less of bamboo fiber having a degree of beating
of 200 ml or less.
Here, if it is less than 5 wt%, the rigidity improvement effect is small, and if it exceeds 20 wt%,
water leakage at the time of papermaking becomes worse, which adversely affects the
productivity.
Preferably, they are 10 wt% or more and 18 wt% or less.
[0024]
By adopting such a configuration, material rigidity can be improved by securing strength and
elastic modulus of bamboo fiber obtained from bamboo having rigidity, and sufficient strength
and elastic modulus can be given to the diaphragm. Therefore, high sound quality can be
achieved as a speaker, and high reliability can be achieved.
[0025]
Although the treatment method of the present invention is not particularly limited, a method
such as repeating alkali treatment with a NaOH solution or the like may be mentioned.
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In addition, adjustment of the degree of beating can also be performed by a method using a
known beater, refiner or the like.
[0026]
Since the diaphragm of the present invention uses bamboo fibers that are environmentally
friendly, it is more preferable in terms of the environment to use polylactic acid or raw rubber as
the tone control agent. Polylactic acid is suitable not only for environmental aspects but also for
controlling the sound quality, and is suitable for improving the rigidity of the diaphragm and is
effective for improving the sound quality. Raw rubber is also suitable for improving the internal
loss of the diaphragm, and is effective for sound quality control and sound quality improvement.
[0027]
Furthermore, the best embodiment of the present invention is a bamboo fiber with 1 wt% of
components other than cellulose and hemicellulose and with a freeness of 400 ml to 500 ml, 70
wt% to 90 wt% of bamboo fiber, and a reinforced bamboo fiber with 50 ml to 100 ml. The fiber
component is composed of 10 wt% to 18 wt% as fibers, and polylactic acid and raw rubber are
used according to the purpose and user's request. By setting it as this structure, material rigidity
can be improved by ensuring the intensity | strength and elasticity modulus of bamboo fiber
obtained from the bamboo which has rigidity, and sufficient intensity | strength and elasticity
modulus can be given to a diaphragm. Therefore, high sound quality can be achieved as a
speaker, and further high performance and high reliability can be achieved.
[0028]
Second Embodiment The invention according to the fifth aspect of the present invention will be
described below with reference to a second embodiment. FIG. 2 shows a cross-sectional view of a
loudspeaker according to an embodiment of the present invention.
[0029]
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.
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[0030]
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.
[0031]
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.
[0032]
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.
Furthermore, it is also possible to apply to a small speaker in which the diaphragm 27 and the
edge 29 are integrated.
[0033]
With this configuration, as described in the first embodiment, the material rigidity is improved by
securing the strength and elastic modulus of bamboo fiber obtained from bamboo having rigidity,
and the diaphragm has sufficient strength and elastic modulus Since the speaker can be provided
using this diaphragm, high sound quality, high performance, and high reliability can be achieved
as the speaker.
[0034]
Furthermore, it is possible to provide an inexpensive speaker friendly to the global environment,
and to provide an excellent speaker not only in terms of performance, quality, reliability, but also
in terms of environment and cost.
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[0035]
Third Embodiment The third embodiment of the present invention will be described below in
particular for the sixth aspect of the present invention.
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.
[0036]
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 and a source input to the amplifier 42 And an audio mini-component
system 44, which is an electronic device.
[0037]
With this configuration, it is possible to realize a mini component system that achieves high
sound quality and high reliability that can not be realized conventionally.
[0038]
Furthermore, it is possible to provide an inexpensive and environmentally friendly minicomponent system, and a mini-component system excellent in performance, quality, reliability,
environment, and cost.
[0039]
Fourth Embodiment The invention according to the seventh aspect of the present invention will
be described below with reference to the fourth embodiment.
FIG. 4 shows a cross-sectional view of an automobile 50 which is a device of an embodiment of
the present invention.
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[0040]
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.
With this configuration, it is possible to realize an apparatus for obtaining high sound quality and
high reliability of the speaker 30.
[0041]
Furthermore, an inexpensive device friendly to the global environment can be provided, and the
device can be excellent not only in performance, quality, reliability, environment, or cost.
[0042]
The speaker diaphragm, the speaker, the electronic device, and the device according to the
present invention are electronic devices such as audiovisual devices and information
communication devices that require high performance and high performance and reliability such
as sound quality and characteristics by the high rigidity diaphragm. Furthermore, it is applicable
to apparatuses, such as a car.
[0043]
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 50
automobile
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