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JP2009239589

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2009239589
An object of the present invention is to improve the sound quality of a speaker. In order to
achieve this object, a speaker diaphragm 1 according to the present invention comprises a woven
fabric layer 2 in which a thermosetting resin impregnated is in a thermosetting state, and a heatsensitive layer on the back side of the woven fabric layer. The non-woven fabric layer 3 has a
structure in which bamboo fibers are mixed with the non-woven fabric layer 3, so that when the
non-woven fabric layer 3 and the woven fabric layer 2 are integrated by thermocompression
bonding, The fluff will get into the stitches of the woven fabric layer 2. In this state, when the
nonwoven fabric layer 3 and the woven fabric layer 2 are integrated by thermocompression
bonding, the fluff entering the stitches of the woven fabric layer 2 is intertwined with the woven
yarn 7 and the nonwoven fabric layer 3 and the woven fabric layer 2 are sufficiently Can be
integrated into the As a result, in the speaker diaphragm according to the present invention, the
excellent Young's modulus of the woven fabric layer 2 and the excellent internal loss of the nonwoven fabric layer 3 can be sufficiently exhibited. Therefore, in the speaker diaphragm 1
according to the present invention, the sound quality of the speaker can be improved. [Selected
figure] Figure 1
Speaker diaphragm, speaker using the same, and method of manufacturing speaker diaphragm
[0001]
The present invention relates to a speaker diaphragm and a speaker using the same.
[0002]
In order to reproduce the sound with excellent sound quality by the speaker, it is necessary for
the speaker diaphragm used for the speaker to have a large Young's modulus and an appropriate
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internal loss.
[0003]
Therefore, for example, in Patent Document 1, the speaker diaphragm 104 is configured of the
inorganic fiber woven fabric 101 as shown in the perspective view of FIG. 9 and the laminate
103 in which the natural fiber nonwoven fabric 102 is further overlaid on the lower surface
thereof. Was proposed.
[0004]
That is, in the speaker diaphragm 104 described in Patent Document 1, the inorganic fiber
woven fabric 101 having a small Young's modulus but a small internal loss is bonded to the
natural fiber nonwoven fabric 102 having a small Young's modulus but a large internal loss. In
order to achieve excellent characteristics for both Young's modulus and internal loss.
Unexamined-Japanese-Patent No. 2003-219493
[0005]
However, in the above-described conventional speaker diaphragm 104, since the inorganic fiber
woven fabric 101 and the natural fiber nonwoven fabric 102 having different properties are
simply bonded to each other, the inorganic fiber woven fabric 101 and the natural fiber
nonwoven fabric 102 are It was hard to say that they were fully integrated.
[0006]
Therefore, in the conventional speaker diaphragm 104, it is difficult to fully exhibit the large
Young's modulus of the inorganic fiber woven fabric 101 and the large internal loss of the
natural fiber nonwoven fabric 102, and the improvement of the sound quality of the speaker is
sufficiently satisfactory. It was not something that could be done.
[0007]
Then, an object of this invention is to improve the sound quality of a speaker by raising the
Young's modulus and internal loss of a diaphragm for speakers.
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[0008]
And in order to achieve this object, the speaker diaphragm in the present invention comprises a
woven fabric layer impregnated with a thermosetting resin, and a non-woven fabric layer
pressure bonded and integrated by applying at least heat to the back side of the woven fabric
layer. And the non-woven fabric layer is mixed with bamboo fiber.
[0009]
According to the above configuration, the present invention can increase the Young's modulus
and internal loss of the speaker diaphragm, and can improve the sound quality of the speaker.
[0010]
This is because bamboo fibers are mixed in the non-woven fabric layer constituting the speaker
diaphragm of the present invention.
[0011]
That is, since bamboo fiber is hard and has high rigidity and toughness, softwood pulp fibers are
easily arranged in the direction (sleeping) along the surface of the nonwoven layer on the surface
of the nonwoven layer before thermocompression bonding. Bamboo fiber is likely to rise to the
surface of the non-woven fabric layer.
Therefore, many fluffs by bamboo fibers are present on the surface of the non-woven fabric layer
before thermocompression bonding, and when the non-woven fabric layer and the woven fabric
layer are integrated by thermocompression bonding, these fluffs get into the stitches of the
woven fabric layer It will be.
In this state, when the non-woven fabric layer and the woven fabric layer are integrated by
thermocompression bonding, the fluff entering the woven fabric entangles with the woven fabric
yarn, and the non-woven fabric layer and the woven fabric layer can be sufficiently integrated. It
becomes.
[0012]
As a result, a diaphragm in which the non-woven fabric layer and the woven fabric layer are
sufficiently integrated is formed, and in the speaker diaphragm of the present invention, the
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excellent Young's modulus of the woven fabric layer and the excellent internal loss of the nonwoven fabric layer are sufficiently obtained. It can be demonstrated.
[0013]
Further, in the speaker diaphragm of the present invention, the Young's modulus is further
improved by the high rigidity and toughness possessed by the mixed bamboo fiber itself.
[0014]
Therefore, the speaker diaphragm according to the present invention can improve the sound
quality of the speaker.
[0015]
Hereinafter, the configuration of an embodiment of the present invention will be described using
the drawings.
[0016]
FIG. 1 (a) is a perspective view of the speaker diaphragm 1, and FIG. 1 (b) is an enlarged view of
the main part when the speaker diaphragm is viewed from the surface side.
As shown in FIG. 1 (a), the speaker diaphragm 1 of this embodiment has a two-layer structure of
a layer of the woven fabric layer 2 and a layer of the non-woven fabric layer 3, and as will be
described later The fluff 4 of the layer 3 is entangled with the woven layer 2.
[0017]
The woven fabric layer 2 is formed by weaving two types of yarns 7 of warp yarn 5 and weft
yarn 6 in a grid shape, as shown in FIG. When mounted on a speaker, it is exposed to the surface
of the speaker.
A thermosetting resin (not shown) is present in the inner and outer peripheral portions of the
warp 5 and the weft 6, and the thermosetting resin is thermally cured to form the warp 5 and the
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weft 6 itself, And the woven fabric layer 2 formed by weaving them is in a cured state.
[0018]
The woven fabric layer 2 contains at least one of high strength fibers such as aramid fibers,
polyester fibers, acrylic fibers, cotton fibers, carbon fibers, glass fibers, and silk fibers, and is
used as a thermosetting resin. Uses a resin containing at least one of a phenol resin, an acrylic
resin, an epoxy resin, and a vinyl ester resin.
[0019]
The non-woven fabric layer 3 is formed by mixing bamboo fiber at a content of 0.5 wt% or more
and 20 wt% or less in softwood pulp fibers.
The bamboo fiber mixed in the non-woven fabric layer 3 is beaten to a small size so as to be in a
microfibrillar state, and the average fiber diameter is set to 5 μm or less so that the fiber is
sufficiently entangled with softwood pulp fiber.
[0020]
The nonwoven fabric layer 3 is integrated on the back side of the woven fabric layer 2 by
thermocompression bonding.
As described above, since the nonwoven fabric layer 3 is integrated by thermocompression
bonding on the back side of the woven fabric layer 2, air does not pass from the surface side to
the back side of the speaker diaphragm 1.
[0021]
Furthermore, bamboo fibers and softwood pulp fibers constituting the non-woven fabric layer 3
are filled in the stitches 8 which are portions surrounded by the adjacent warps 5 and wefts 6 of
the woven fabric layer 2, and bamboo fibers and softwoods of the non-woven fabric layer 3 The
fluff 4 of the pulp fiber is entangled with the warp yarn 5 and the weft yarn 6 from the surface
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side of the woven fabric layer 2 (the side opposite to the bonding surface with the nonwoven
fabric layer 3) as shown in FIG. It has a structure cured by a thermosetting resin.
That is, in addition to the thermosetting resin being cured by heat and the woven fabric layer 2
and the non-woven fabric layer 3 being pressure-bonded and integrated, the speaker diaphragm
1 is made of bamboo fiber and the woven fabric layer 2 and the non-woven fabric layer 3 It will
be integrated by crimping.
Strictly speaking, the stitch 8 refers to a substantially rectangular parallelepiped portion whose
bottom surface is a surface surrounded by the warp yarn 5 and the weft yarn 6.
[0022]
Here, FIG. 2 shows a schematic cross-sectional view taken along the dotted line AA 'in FIG. 1 (b).
[0023]
That is, in the speaker diaphragm 1 in the present embodiment, bamboo fibers and softwood
pulp fibers of the non-woven fabric layer 3 are filled in the stitches 8 between the warps 5 as
shown in FIG. The fluff 4 of bamboo fiber and softwood pulp fiber is thermocompression-bonded
in a state of being entangled with the warp 5 from the surface side of the woven fabric layer 2.
In addition, although the mode that the fluff 4 has become entwined with the warp 5 was
demonstrated here, also in the weft 6, the fluff 4 has become entwined similarly to the warp 5.
[0024]
Next, FIG. 3 shows a cross-sectional view of the speaker 11 using the speaker diaphragm 1 in the
present embodiment described above.
[0025]
As shown in FIG. 3, the speaker 11 includes a magnetic circuit 13 having a cylindrical magnetic
gap 12 and a cylindrical voice coil body 15 in which a coil 14 portion is movably disposed in the
magnetic gap 12. ing.
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[0026]
The inner peripheral portion of the cone-shaped speaker diaphragm 1 is connected to the outer
peripheral portion near the upper end of the voice coil body 15, and the outer peripheral portion
of the speaker diaphragm 1 has a ring-shaped first edge 16 Are connected to the top opening of
the frame 17 in the form of a bowl.
In addition, a hemispherical dust cap 18 is provided in the vicinity of the inner peripheral portion
of the speaker diaphragm 1 so as to cover the upper surface side of the voice coil body 15, and
this dust cap 18 It has a function to prevent the entry of moisture and the like.
[0027]
Further, the lead wire 19 from the coil 14 of the voice coil body 15 is drawn from the upper
portion of the voice coil body 15 to the outside of the frame 17 in a noncontact state with the
speaker diaphragm 1.
An alternating current to which an audio signal is added via the lead wire 19 flows from the
outside of the speaker to the coil 14.
[0028]
Furthermore, an inner peripheral end of the second edge 20 of a ring-shaped planar shape
formed of an elastic body in a portion between the lead wire 19 lead portion of the voice coil
body 15 and the portion disposed inside the magnetic gap 12. Are connected via the suspension
holder 21.
Further, the other end side of the second edge 20 is coupled to the inner surface middle portion
of the frame 17.
[0029]
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The second edge 20 and the first edge 16 are formed of an elastic material such as urethane or
rubber, but the second edge 20 is downward and the first edge 16 is upward. They are shaped to
project in opposite directions.
[0030]
As described above, by forming the first edge 16 and the second edge 20 so as to project in
opposite directions, the movable load in the upper and lower directions of the voice coil body 15
approximates.
[0031]
Therefore, the operation of the speaker diaphragm 1 also has symmetry in the upper and lower
directions, and as a result, distortion included in the sound reproduced from the speaker 11 can
be reduced.
[0032]
Hereinafter, the operation and effect of the present embodiment will be described.
[0033]
When an audio signal is supplied to the voice coil body 15 of the speaker 11 configured as
described above, the voice coil body reacts with the magnetic field formed by the magnetic gap
12 to generate driving force in the voice coil body 15.
The driving direction is in accordance with Fleming's left hand rule, and the voice coil body 15
fluctuates up and down.
Then, due to the fluctuation of the voice coil body 15, the speaker diaphragm 1 whose inner
peripheral portion is connected to the voice coil body 15 is similarly vibrated in the vertical
direction, and the sound is generated from the speaker 11 by moving the air. It is a mechanism.
[0034]
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However, in the case where the speaker diaphragm is formed by overlapping the members such
as the woven fabric and the paper, these members can not be sufficiently integrated because they
have different properties.
As a result, it is difficult for the speaker diaphragm of such a configuration to maximize the large
Young's modulus of the woven fabric layer fixed with the thermosetting resin and the large
internal loss of the non-woven fabric layer. It could not be improved enough.
[0035]
Therefore, in the speaker diaphragm 1 of the present embodiment, bamboo fibers are mixed in
the non-woven fabric layer 3.
[0036]
As described above, in the non-woven fabric layer 3 mixed with bamboo fiber, the bamboo fiber
has high rigidity and high toughness, so that the bamboo fiber tends to stand on the surface of
the non-woven fabric layer 3 .
For this reason, a large amount of fluff 4 in a state of standing up to the surface of the nonwoven fabric layer 3 by bamboo fiber is generated, and the fluff 4 is filled in the stitch 8 of the
woven fabric layer 2.
In the speaker diaphragm 1 of the present embodiment, the fluff 4 is filled in the stitches 8 of the
woven fabric layer 2, and the fluff 4 is further entangled with the woven yarn 7 of the woven
fabric layer 2. Since the thermocompression bonding is performed integrally, the woven fabric
layer 2 and the non-woven fabric layer 3 are firmly integrated.
[0037]
Therefore, the speaker diaphragm 1 of the present embodiment is woven in comparison with the
conventional speaker diaphragm 4 in which only the back surface side of the woven fabric layer
2 is generally bonded to the non-woven fabric layer 3. The fabric layer 2 and the non-woven
fabric layer 3 are sufficiently integrated, and as a result, the excellent Young's modulus of the
woven fabric layer and the excellent internal loss of the non-woven fabric layer can be fully
exhibited. It is possible.
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[0038]
Further, since bamboo fiber has high rigidity and toughness, the Young's modulus of the speaker
diaphragm 1 can be further enhanced by the rigidity and toughness of the bamboo fiber itself.
[0039]
As described above, the speaker diaphragm 1 in the present embodiment can increase the
internal loss and the Young's modulus, and can improve the sound quality of the speaker 11.
Further, as described above, in the speaker diaphragm 1 of the present embodiment, since the
woven fabric layer 2 and the non-woven fabric layer 3 can be joined with a strong bonding force,
the woven fabric layer 2 and the non-woven fabric layer 3 peel The possibility of doing so can be
very low.
[0040]
In addition, the diaphragm 1 for speakers of this embodiment which uses bamboo fiber as a
material mixed in the nonwoven fabric layer 3 is excellent also in terms of cost and environment.
That is, since conifers, which have been used as materials for conventional speaker diaphragms,
are cut down in various parts of the world for various uses other than speaker diaphragms, there
is a concern that coniferous trees may be insufficient at present. It is in.
On the other hand, bamboo is present in large numbers mainly in Asia compared with coniferous
trees, and its growth rate is very fast, so it is thought that it will not adversely affect the
environment as conifer harvesting.
In the present embodiment, bamboo fibers are mixed in the non-woven fabric layer 3 based on
such a situation, and the proportion of softwood pulp fibers in the non-woven fabric layer 3 is
reduced.
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As a result, the speaker diaphragm 1 in the present embodiment can be manufactured at low cost
without adversely affecting the environment.
[0041]
In addition, bamboo fibers mixed in the non-woven fabric layer 3 in the present embodiment are
in a microfibrillated state with an average fiber diameter of 5 μm or less by beating.
As described above, when the mixed bamboo fiber is in a microfibrillated state, the entanglement
of the bamboo fiber and the softwood pulp fiber can be improved, and the Young's modulus of
the speaker diaphragm can be improved.
[0042]
In the present embodiment, although the average fiber diameter of bamboo fibers mixed in the
non-woven fabric layer 3 is 5 μm or less, the average fiber diameter of bamboo fibers may be 5
μm or more. Thus, when the average fiber diameter of bamboo fiber is 5 μm or more, the force
to strengthen the entanglement between bamboo fiber and softwood pulp fiber is reduced
compared to the case where the average fiber diameter is 5 μm or less. It has a sufficiently
superior Young's modulus and internal loss as compared to the conventional diaphragm.
Alternatively, the non-woven fabric layer 3 may be made of bamboo fiber only, and the speaker
diaphragm 1 may be formed. In this case, the original properties of bamboo fiber are exhibited,
that is, the rigidity and toughness of bamboo fiber can make the Young's modulus higher than
that of a conventional speaker diaphragm.
[0043]
Further, as the thermosetting resin contained in the woven fabric layer 2, it is preferable to use a
resin containing at least one of a phenol resin, an acrylic resin, an epoxy resin, and a vinyl ester
resin. If it is a resin containing these resins, it can be sufficiently cured at the time of
thermocompression bonding to increase the hardness of the speaker diaphragm 1, and the
Young's modulus of the speaker diaphragm 1 can be increased.
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[0044]
Further, an aramid fiber may be mixed in the non-woven fabric layer 3. As described above,
mixing aramid fibers with high hardness into the non-woven fabric layer 3 can increase the
strength of the speaker diaphragm 1 and the hardness of the speaker diaphragm 1 also increases
accordingly, thereby further increasing the Young's modulus. be able to. Even in the case where
aramid fibers are mixed in this way, bamboo fibers can be sufficiently entangled with aramid
fibers by beating the bamboo fibers into a microfibrillated state, and the properties of bamboo
fibers can be exhibited. .
[0045]
Similarly, as the woven fabric layer 2, it is desirable to use a woven fabric containing at least one
of hard fibers such as aramid fiber, polyester fiber, acrylic fiber, cotton fiber, carbon fiber, glass
fiber, and silk fiber. . By using a woven fabric containing these fibers, the hardness of the woven
fabric layer 2 can be improved, and the Young's modulus of the speaker diaphragm 1 can be
increased.
[0046]
Further, in the speaker mounted with the speaker diaphragm 1, it is desirable that the checkered
pattern of the woven fabric layer 2 be exposed on the surface of the speaker.
[0047]
That is, when the speaker diaphragm 1 is mounted on the speaker, the diaphragm for the
speaker can be formed by exposing the plaid formed by the warp yarn 5 and the weft yarn 6
shown in FIG. 1A on the surface of the speaker. It is possible to prevent the occurrence of a local
resonance effect.
[0048]
Hereinafter, a method of manufacturing the speaker diaphragm 1 of the present embodiment will
be described.
[0049]
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FIG. 4 shows a molding machine composed of a first mold 22 and a second mold 23 for forming
the speaker diaphragm 1.
[0050]
The first mold 22 has a truncated cone shape with a downwardly projecting mold, and the
second mold 23 is fitted with the truncated cone shape of the first mold 22 It has a plate shape.
Although not shown, a heater for heating is attached to the first mold 22 and the second mold
23.
[0051]
The first mold 22 and the second mold 23 are prepared. First, the first mold 22 is pulled away in
the upper direction of the second mold 23.
[0052]
Next, the plate-like papermaking screen 24 is placed on the second mold 23.
[0053]
This papermaking screen 24 is in a state where softwood pulp fibers and bamboo fibers, which
are raw materials of the non-woven fabric layer 3, are scooped out from the dissolving tank as
shown in FIG. A deposited layer 25 having a thickness of about 10 mm is formed.
In addition, since bamboo fibers in a fibrillated state are uniformly mixed in the dissolution tank,
bamboo fibers are uniformly present in the deposition layer 25 and randomly oriented.
In addition, the amount of bamboo fiber mixed in the dissolution tank is adjusted so that the
bamboo fiber becomes 0.5 wt% or more and 20 wt% or less when the moisture of the deposited
layer 25 is evaporated.
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[0054]
In this state, the heater for heating the second mold 23 is driven to evaporate the water
contained in the deposited layer 25 by heating.
Here, since the first mold 22 is not pushed down, the deposited layer 25 is not compressed by
the first mold 22 and the second mold 23.
That is, the deposited layer 25 is heated and dried in a non-pressurized state.
In the present embodiment, only the heater for heating attached to the second mold 23 is driven,
but not only the heater for heating embedded in the second mold 23 but also the first mold The
heating heater attached to 22 may be simultaneously driven. Alternatively, the deposited layer
25 may be dried with warm air such as a drier or may be naturally dried without driving the
heating heater.
[0055]
As described above, when the deposited layer 25 is heated and dried in a non-pressurized state,
the deposited layer 25 is dried as it is scooped from the pulp solution, as shown in FIG. A large
number of fluffs 25 a of bamboo fiber and softwood pulp fibers are generated on the surface
facing the first mold 22, and the surface of the deposited layer 25 is in a fluffed state.
[0056]
In particular, the fluff 25a of bamboo fiber is in a state of rising with respect to the surface of the
sedimentary layer 25 as compared to softwood pulp fiber.
This is because softwood pulp fibers tend to spread on the surface of the sedimentary layer 25
after drying and be disposed in a direction along the surface of the sedimentary layer 25 (in a
state of lying on the surface), while bamboo fiber is softwood. Because it has high rigidity and
toughness compared to pulp fibers, it tends to be easy to maintain the condition before drying.
That is, on the surface of the deposited layer 25 before drying, bamboo fibers that are oriented
other than in the direction along the surface are kept as they are when they are dried by heating,
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and as a result, on the surface of the deposited layer 25 after drying It will be in a state of
happening.
[0057]
That is, among bamboo fibers randomly oriented in the deposited layer 25 before drying,
bamboo fibers present on the surface of the deposited layer 25 and oriented in directions other
than the direction along the surface of the deposited layer 25 are fluff after drying It becomes
25a.
[0058]
Next, as shown in FIG. 7, the flat woven fabric 26 before embossing is subjected to the first mold
22, the deposited layer 25 and the second mold in a state in which the paper screen 24 is placed.
Place between 23 and.
The flat woven fabric 26 is a member corresponding to the woven fabric layer 2 after molding,
and is formed by weaving yarns in a lattice shape. The flat woven fabric 26 is impregnated in
advance with a thermosetting resin containing at least one of a phenol resin, an acrylic resin, an
epoxy resin, and a vinyl ester resin thermosetting resin.
[0059]
Then, from this state, as shown in FIG. 8, the first mold 22 is pushed down to the second mold
23, and the deposited layer 25 and the flat woven fabric 26 are pressed and compressed. At this
time, the bamboo fibers and softwood pulp fibers of the deposited layer 25 are fluffed, so the
fluff 25a shown in FIG. 6 enters the stitches of the flat woven fabric 26 and protrudes from the
surface of the flat woven fabric 26. And will be subsequently compressed.
[0060]
That is, with the fluff 25a of bamboo fiber and softwood pulp fiber of the deposited layer 25
filled with the stitches of the flat woven fabric 26, the deposited layer 25 and flat woven fabric
26 are clamped.
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[0061]
At this point, the deposited layer 25 and the flat woven fabric 26 are deformed by pressure and
compression, respectively, and the shapes of the non-woven layer 3 and the woven layer 2 of the
speaker diaphragm 1 shown in FIG. Become.
[0062]
Furthermore, in a state where the deposited layer 25 and the flat woven fabric 26 are clamped,
the first mold 22 and the second mold 23 are heated to 180 degrees to 250 degrees to
impregnate the flat woven fabric 26. The thermosetting resin is thermally cured to integrate the
deposited layer 25 and the flat woven fabric 26.
That is, the deposited layer 25 and the flat woven fabric 26 are integrated by applying heat, and
the fluff 25 a is also integrated by being intertwined with the flat woven fabric 26.
[0063]
Thereafter, the first mold 22 and the second mold 23 are opened, the molded speaker diaphragm
1 is taken out, and the papermaking screen 24 is peeled off.
In the present embodiment, although the mold is clamped in a state where the deposited layer 25
and the paper screen 24 are placed on the second mold 23, the paper screen 24 is peeled off
after heating and drying the deposited layer 25. Only the deposited layer 25 may be clamped.
[0064]
If the unnecessary part is cut ¦ judged suitably after the above process, the diaphragm 1 for
speakers shown to FIG. 1 (a), (b) and FIG. 2 will be formed.
[0065]
As described above, according to the manufacturing method of the present embodiment, the fluff
25a of the surface of the deposition layer 25 facing the first mold 22 is filled in the mesh of the
flat woven fabric 26, and from the surface of the flat woven fabric 26. From the surface side of
the woven fabric layer 2 as shown in FIG. 1 (a), FIG. 1 (b) and FIG. 2, the fluff 4 by bamboo fiber
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and softwood pulp fiber can be compression molded in a state of being protruded. It is possible
to form the speaker diaphragm 1 having a configuration in which the yarn 7 is tangled and is
fixed by the thermosetting resin.
[0066]
In the speaker diaphragm of the present invention, bamboo fiber is mixed in the non-woven
fabric layer, and the mesh of the woven fabric layer is added to the fluff of the non-woven fabric
layer and is filled with fluff of bamboo fiber from the surface side of the woven fabric layer Since
the fluff is entangled, the woven layer and the non-woven layer can be sufficiently integrated,
and the internal loss and the Young's modulus of the speaker diaphragm can be increased.
Therefore, the speaker diaphragm in the present invention can improve the sound quality of the
speaker, and is useful in various audio devices.
[0067]
(A) A perspective view of a speaker diaphragm according to an embodiment of the present
invention, (b) an enlarged view of a main part of the speaker diaphragm according to an
embodiment of the present invention Cross-sectional schematic view Sectional view showing a
speaker according to an embodiment of the present invention Sectional view showing a method
for manufacturing a speaker diaphragm according to an embodiment of the present invention
Shown a method for manufacturing a speaker diaphragm according to an embodiment of the
present invention Cross-sectional view Cross-sectional view of raw material of loudspeaker
diaphragm according to one embodiment of the present invention Cross-sectional view showing
fabrication method of loudspeaker diaphragm according to one embodiment of the present
invention fabrication method of loudspeaker diaphragm according to one embodiment of the
present invention A sectional view showing a perspective view of a conventional diaphragm for a
speaker
Explanation of sign
[0068]
Reference Signs List 1 diaphragm for speaker 2 woven fabric layer 3 non-woven fabric layer 4
fluff 5 warp yarn 6 weft 7 weave yarn 8 stitch 11 speaker 12 magnetic gap 13 magnetic circuit
14 coil 15 voice coil body 16 first edge 17 frame 18 dust cap 19 lead wire Reference Signs List
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20 second edge 21 suspension holder 22 first mold 23 second mold 24 papermaking screen 25
deposited layer 25 a fluff 26 flat woven fabric
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