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JP2009111802

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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 JP2009111802
The present invention relates to a method of manufacturing a speaker diaphragm used for
various audio devices and video devices, a speaker diaphragm manufactured by this
manufacturing method, a speaker, an electronic device, and a device, and has a slim shape It has
been an object to easily improve the rigidity of the speaker diaphragm having an outer shape
without deteriorating the characteristics thereof. The present invention relates to a diaphragm
main body for a speaker having an outer shape which is manufactured by a paper making
method and has any one of a rectangular shape, a rectangular shape, a track shape, and an oval
shape. As a secondary material to locally improve the stiffness, it is characterized by forming
finely divided natural fibers by spray coating, and it is easy to locally create stiffness without
deteriorating the characteristics of the speaker diaphragm It is a method of manufacturing a
speaker diaphragm that can be improved. [Selected figure] Figure 1
Method of manufacturing diaphragm for speaker, speaker diaphragm manufactured by this
manufacturing method, speaker using the same, electronic device and apparatus using the
speaker
[0001]
The present invention relates to a method of manufacturing a speaker diaphragm used for
various audio equipment and video equipment, a speaker diaphragm manufactured by this
manufacturing method, a speaker using this diaphragm, and an electronic device such as a stereo
set or a television set The present invention relates to devices and devices such as automobiles.
[0002]
In the audio industry and the automobile industry equipped with audio devices in recent years,
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1
the spread of digital devices has dramatically improved the sound quality reproduced from
speakers.
[0003]
The main trend for speakers in these industries is high sound quality, compact and compact.
[0004]
In order to realize the sound quality desired by the user in the development of high sound
quality, it is urgently necessary to develop a diaphragm which is a component of the speaker and
which greatly affects the sound quality of the speaker.
[0005]
The development of this diaphragm is being carried out centering on a papermaking diaphragm
because the sound quality can be controlled with higher accuracy.
[0006]
Conventionally, as a material used for a papermaking diaphragm, one obtained by beating kraft
pulp from softwood with a beater or the like is used.
[0007]
In addition, in the trend of downsizing and downsizing, it is necessary to make the external shape
of the speaker into a slim shape such as a rectangular shape, a rectangular shape, a track shape,
or an elliptical shape, and of course the shape of the speaker diaphragm is also slim. You need to
[0008]
And, at present, there is a demand for improvement in performance of the speaker and
diaphragm having these slim shapes, in particular, improvement in sound quality.
[0009]
As prior art document information for the invention of this application, for example, Patent
Document 1 is known.
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2
Japanese Patent Application Laid-Open No. 63-126400
[0010]
Conventional papermaking diaphragms based on paper diaphragms using kraft pulp obtained
from softwood generally have lower rigidity due to the material compared to diaphragms made
of metal materials and resin materials There was a tendency.
[0011]
Therefore, a speaker using such a paper diaphragm is disadvantageous in high definition, large
output, and high reliability which is one of high sound quality.
[0012]
Then, when the outer shape of the paper diaphragm is rectangular, rectangular, track, or
elliptical, there is a portion where the rigidity is further reduced at both ends in the longitudinal
direction. In the case of a speaker using a board, it has become more difficult to achieve high
sound quality, large output, and high reliability as described above.
[0013]
Conventionally, in order to compensate for the insufficiency of the rigidity of the diaphragm, a
method of attaching the auxiliary member to the diaphragm entirely or partially using an
adhesive, a tape or the like has been employed in the manufacturing process.
However, when the auxiliary member is entirely attached in this manner, there is a problem that
the weight of the entire diaphragm increases and the characteristics of the diaphragm are
degraded.
Further, when partially attached, there is a problem that the number of parts is large and the
assembling workability is poor.
[0014]
The present invention solves the above-mentioned problems, and it is an object of the present
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3
invention to provide a method for manufacturing a speaker diaphragm which can easily improve
rigidity locally without deteriorating the characteristics of the speaker diaphragm. It is
[0015]
In order to achieve the above object, the present invention provides the diaphragm in the
longitudinal direction both end portions of a diaphragm body for a speaker manufactured by a
papermaking method and having an outer shape of rectangular shape, rectangular shape, track
shape, or elliptical shape. As a secondary material for locally improving the rigidity of the main
body, a method of manufacturing a speaker diaphragm is characterized in that finely divided
natural fibers are formed by spray coating.
[0016]
According to this manufacturing method, it is possible to provide a method for manufacturing a
speaker diaphragm which can easily improve rigidity locally without deteriorating the
characteristics of the speaker diaphragm.
[0017]
As described above, in the manufacturing method according to the present invention, it is
miniaturized as the auxiliary material for compensating for the lack of rigidity only at both
longitudinal end portions of the speaker diaphragm having a slim-shaped outer shape, that is, the
portion with low rigidity. Since the natural fibers are formed, the insufficient rigidity can be
compensated by an increase in weight that does not affect the characteristics of the diaphragm.
In addition, since a spray coating method is used as the forming method, there is no step of
attaching natural fibers with an adhesive, a tape or the like, and a slim diaphragm diaphragm is
manufactured without any deterioration in workability. be able to.
[0018]
First Embodiment The first to third embodiments of the present invention will be described
below using the first embodiment.
[0019]
FIG. 1 is a process chart showing a method of manufacturing a speaker diaphragm by a paper
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making method to which an embodiment of the present invention is applied, and using the same
until the speaker diaphragm is completed by the manufacturing method of the present invention.
explain.
[0020]
As shown in FIG. 1, first, the material of the speaker diaphragm is put into a beater containing
water, and is finely beaten in a beating process over several days.
[0021]
Next, this beaten material is machined onto a mold and a wire mesh disposed thereon by a
papermaking method, and only water is discharged by suction from below, and a shape as a
speaker diaphragm is obtained. Form.
[0022]
Thereafter, a portion of the diaphragm main body other than the spray coating is masked, and a
process is used in which natural fibers having an average fiber length of 0.5 mm or more and a
BET specific surface area of 1 m The solution is applied to the diaphragm body by spraying.
Since the mold is aspirated, only the water is discharged from the spray applied natural fiber
treatment solution.
[0023]
Next, the remaining moisture is heated and pressurized to evaporate.
[0024]
Then, the outermost periphery which becomes unnecessary and the central hole for inserting the
voice coil are punched and processed by a mold.
[0025]
Thus, the speaker diaphragm according to the manufacturing method of the present invention is
completed.
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[0026]
Here, although a method in which one embodiment of the present invention is applied to a
general manufacturing method of a speaker diaphragm by a conventional paper making method
is shown, a manufacturing method of the diaphragm to be applied is limited to this. It is
applicable if the papermaking process is included.
[0027]
The spray application may be performed simultaneously with or after the paper making process,
and may be performed after the pressure process and the punching process.
[0028]
Here, in the present invention, as a method of refining natural fibers, a method of refining with a
bead mill after being beaten with a twin-screw kneader is used.
In this construction method, the material can be miniaturized in a short time and at a lower cost
than the construction method of micronization by a general beater or the like.
That is, when it apply | coats to a diaphragm, the fiber with a big reinforcement effect can be
manufactured efficiently.
[0029]
From the viewpoint of the effect of further improving the rigidity of the coated surface and the
efficiency of producing the finely divided fibers, it is desirable that the mean fiber length of the
finely divided natural fibers be 0.7 mm or more and 1.5 mm or less.
The BET specific surface area is preferably 1 m <2> / g or more from the viewpoint of improving
the rigidity.
[0030]
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In addition, it is desirable that the natural fiber to be applied is bamboo fiber.
The reason is that bamboo fiber has high rigidity as a fiber, and the surface has a multilayer
structure of 4 layers, and is suitable in that it makes the surface feather by friction force, and it is
also good in terms of environment And the like.
[0031]
Here, specific examples of the method for producing finely divided bamboo fiber according to the
present invention and the method for producing a diaphragm on which the bamboo fiber is
spray-coated will be shown below.
[0032]
Seven hundred grams of bamboo fiber having an average fiber length of about 10 cm is treated
with a 3-liter pressure kneader at 25 rpm for 20 minutes for beating.
It is then made into a 5% aqueous dispersion and treated for 20 minutes in a 3 liter bead mill
with glass beads and further beating off.
The average fiber length of the beaten fiber was 0.8 mm, and the BET specific surface area was
2.11 m <2> / g.
Then, a portion of this processing solution diluted to 2% with water is masked except for spray
coating, and in the plane of both end portions in the longitudinal direction on a paper making
diaphragm installed on the paper making die being suctioned. It spray-applied, suctioning to two
near parts.
Thereafter, it was dried at 160 ° C. for 5 minutes to complete a diaphragm.
[0033]
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The weight gain of the diaphragm manufactured by this method is 0.5 g as compared with the
non-spray-coated bamboo fiber, which is not the weight that greatly affects the characteristics of
the diaphragm.
[0034]
Thus, a finely shaped natural fiber, particularly bamboo fiber, is spray-applied to a portion having
a weak rigidity close to the flat surface of each end in the longitudinal direction of the slim
shaped diaphragm having a rectangular shape, rectangular shape, track shape or elliptical shape.
Thus, the rigidity of the diaphragm can be locally improved without significantly affecting the
characteristics of the diaphragm itself and without reducing the workability.
In addition, by refining natural fibers by the method according to the present invention, that is,
refining with a twin-screw kneader and then refining with a bead mill, it is possible to obtain
refined natural fibers in a short time at a lower cost than in the past.
[0035]
Second Embodiment The second embodiment of the present invention will be used to explain the
fourth aspect of the present invention.
[0036]
FIG. 2 shows a plan view of the speaker diaphragm manufactured by the manufacturing method
according to the present invention, and a frame suitable for miniaturizing and compactizing a set
such as a television or audio, and an outer shape Is a speaker diaphragm having a track-shaped
diaphragm.
[0037]
The reference numeral 20 shown in FIG. 2 indicates a secondary material formed by the present
manufacturing method.
[0038]
Although FIG. 2 shows a track-shaped diaphragm, the present invention is similarly applicable to
a rectangular shape, a rectangular shape, and an elliptical shape.
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[0039]
The speaker diaphragm manufactured by the present manufacturing method is improved in
rigidity, so that a clear sound with reduced resonance due to a heavy bass with tightness in the
bass region and lack of the diaphragm rigidity unique to the treble region is reduced. In addition
to providing the above, it is a diaphragm capable of achieving higher output and higher
reliability.
[0040]
Third Embodiment The third embodiment of the present invention will be used to explain the
fifth aspect of the present invention.
[0041]
FIG. 3 shows a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
[0042]
As shown in FIG. 3, the magnetized magnet 21 is sandwiched between the upper plate 22 and the
yoke 23 to form an internal magnetic circuit 24.
[0043]
A frame 26 is coupled to the top plate 22 of the magnetic circuit 24, and the outer periphery of
the diaphragm 27 according to the fourth aspect is bonded to the peripheral edge of the frame
26 through 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.
[0044]
The above has described the speaker having the internal magnet type magnetic circuit 24.
However, the present invention is not limited to this, and may be applied to a speaker having the
external magnet type magnetic circuit.
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[0045]
Furthermore, it is possible to apply also to a small speaker in which the diaphragm 27 and the
edge 29 are integrated.
[0046]
As described in the second embodiment, this configuration reinforces a portion with low rigidity
and configures a speaker using a diaphragm with locally improved rigidity, so that heavy tones
with tightness in the low frequency range can be obtained. , Can play clear sound in the high
range.
[0047]
Here, using the method of manufacturing finely divided bamboo fiber described in the first
embodiment and the diaphragm completed by the method of manufacturing a diaphragm to
which the bamboo fiber is applied, and a diaphragm not to which the spray is applied The
speaker was assembled and frequency-sound pressure characteristics were measured.
The deviation width of the sound pressure of the non-sprayed diaphragm was 12 dB, while that
of the spray-coated diaphragm was 5 dB.
That is, the sound pressure deviation was improved by 7 dB with a weight increase of only 0.5 g,
and the effect of the speaker using the papermaking diaphragm for a speaker in the present
invention was confirmed.
[0048]
Fourth Embodiment The fourth embodiment of the present invention will be described below
with reference to the fourth embodiment.
[0049]
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.
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[0050]
As shown in FIG. 4, the speaker 30 of 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 mini-component system 44,
which is an electronic device, is configured to include an output player 43.
[0051]
With this configuration, it is possible to realize a mini-component system that obtains clear and
powerful sound quality in the high-frequency range and a tight bass in the low-frequency range.
[0052]
Furthermore, the mini component system can be made excellent in quality and reliability.
[0053]
Fifth Embodiment The fifth embodiment of the present invention will be described below with
reference to the seventh aspect of the present invention.
[0054]
FIG. 5 shows a cross-sectional view of an automobile 50 which is an apparatus according to an
embodiment of the present invention.
[0055]
As shown in FIG. 5, 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.
[0056]
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.
[0057]
Furthermore, 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.
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[0058]
The method for manufacturing a speaker diaphragm according to the present invention can be
applied to a method for manufacturing a speaker diaphragm that can provide a high quality
diaphragm at low cost.
In addition, the speaker diaphragm, the speaker, the electronic device, and the device
manufactured by this manufacturing method need to be compact and compact, and it is
necessary to improve the sound quality and characteristics by the high rigidity diaphragm and to
have high quality and reliability. The present invention can be applied to electronic devices such
as audiovisual devices and information communication devices, and devices such as automobiles.
[0059]
Process chart showing a method of manufacturing a speaker diaphragm in an embodiment of the
present invention A plan view of a speaker diaphragm in an embodiment of the present invention
A sectional view of a speaker diaphragm in an embodiment of the present invention External
view of electronic device in one embodiment of the invention Cross section of device in one
embodiment of the present invention
Explanation of sign
[0060]
Reference Signs List 20 auxiliary member 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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