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JP2002232990

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DESCRIPTION JP2002232990
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker member having a diaphragm portion and an edge portion. More specifically, the present
invention relates to a speaker member in which the diaphragm portion and the edge portion are
formed using the same material (the same base material) and both the diaphragm portion and
the edge portion have excellent request characteristics. .
[0002]
2. Description of the Related Art Generally, in a speaker, the diaphragm and the edge are formed
of different materials. This is because the performances required for the diaphragm and the edge
are completely different. That is, since the diaphragm generates sound waves by pushing back
and forth air to generate compression waves, a strength that can withstand the pressure of air is
required. On the other hand, the edge is required to have flexibility capable of following the
movement of the diaphragm and vibration absorption capable of absorbing the vibration without
reflecting the sound wave propagating through the diaphragm. Furthermore, the edge is required
to be non-ventilated to prevent forward sound waves from rolling back. Thus, conventional
speakers are manufactured by separately forming the diaphragm and the edge from different
materials and bonding them in order to satisfy the contradictory performance requirements for
the diaphragm and the edge. Therefore, the conventional speaker requires the material cost for
each of the diaphragm and the edge, and requires the forming process and the bonding process,
and thus has a problem that it is very expensive and the manufacturing efficiency is low.
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[0003]
In order to solve such a problem, a technique has been proposed in which the diaphragm portion
and the edge portion are simultaneously formed when forming a pulp cone. However, in this
technique, a resin layer must be specially provided on the edge in order to prevent the ventilation
of the edge and to suppress the reflection of the diaphragm. Therefore, the number of
manufacturing steps is large and complicated, and in particular, the edge portion bent by the
vibration of the diaphragm is insufficient in durability and water resistance because the strength
of the pulp fiber as the core material is low, and the resin layer is There is a problem that the
flexibility of the edge is insufficient by being provided.
[0004]
Alternatively, a technique has been proposed in which the diaphragm and the edge are
simultaneously formed by two-color molding of injection molding. However, in this technology,
the available materials are limited to the thermoplastic resin, so the heat resistance and the
elastic modulus of the obtained speaker are insufficient.
[0005]
Furthermore, a technique has also been proposed in which a resin film or metal foil is formed
into a cone or dome-shaped diaphragm shape and, at the same time, a roll-shaped edge is
formed. However, in this technology, no device is made to simultaneously satisfy contradictory
requirements of the diaphragm and the edge, and the strength of the edge becomes equal to the
strength of the diaphragm. As a result, sufficient amplitude can not be obtained, and there is little
vibration absorption of the edge, so a speaker that can withstand practical use in the entire band
can not be obtained.
[0006]
As described above, there is a strong demand for a speaker member in which the diaphragm
portion and the edge portion are formed using the same material, and both the diaphragm
portion and the edge portion have excellent request characteristics.
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[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the abovementioned conventional problems, and the object of the present invention is to make the
diaphragm part and the edge part the same material (the same base material) It is an object of
the present invention to provide a speaker member which is formed using the above-mentioned
and has both the diaphragm portion and the edge portion have excellent demand characteristics.
[0008]
SUMMARY OF THE INVENTION As a result of intensive studies on the material forming the
diaphragm and the edge, and the process of manufacturing the diaphragm and the edge, the
present inventors have found a portion and an edge portion to be the diaphragm portion of the
substrate. By selectively applying a predetermined thermosetting resin to each of the portions to
be formed, the diaphragm portion and the edge portion can be formed using the same base
material, and the diaphragm portion and the edge portion are It has been found that a speaker
member having both excellent request characteristics can be obtained, and the present invention
has been completed.
[0009]
The speaker member of the present invention includes a diaphragm portion including a base and
a first thermosetting resin impregnated in the base, and the same base as the diaphragm portion,
and the first And an edge portion containing a second thermosetting resin different from the
thermosetting resin, wherein the second thermosetting resin is a hydroxyl group-terminated
polybutadiene represented by the following formula (I): And n is an integer of 500 to 5000, a is
0.1 to 0.6, b is 0.1 to 0.4, c is 0.4 to 0.8, a, The sum of b and c is 1.
[0010]
In a preferred embodiment, the second thermosetting resin is crosslinked via a polyisocyanate
compound.
[0011]
In a preferred embodiment, the polyisocyanate compound is methylene diphenyl diisocyanate,
tolylene diisocyanate, xylylene diisocyanate, naphthylene 1,5-diisocyanate, tetramethylxylene
diisocyanate, isophorone diisocyanate, hydrogenated xylylene diisocyanate, dicyclohexylmethane
diisocyanate, hexacene It is selected from methylene diisocyanate, dimer acid diisocyanate,
trimethylhexamethylene diisocyanate and norbornene diisocyanate.
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[0012]
In another preferred embodiment, the second thermosetting resin is crosslinked via a melamine
compound.
[0013]
In a preferred embodiment, the melamine compound is represented by the following formula (II):
wherein each of R 1 to R 6 is independently hydrogen, CH 2 OH or CH 2 ORa; and Ra is each
independently 1 It is a linear or branched alkyl group having ~ 4 carbon atoms.
[0014]
In a preferred embodiment, the edge portion is foamed by a gas by-produced in the crosslinking
reaction of the second thermosetting resin and the melamine compound.
[0015]
In a preferred embodiment, the weight ratio of the second thermosetting resin to the melamine
compound is in the range of 90/10 to 60/40.
[0016]
The method for manufacturing a member for a speaker according to the present invention
comprises the steps of: forming a substrate; and impregnating a portion of the substrate to
become a diaphragm portion of a first thermosetting resin; Curing the thermosetting resin to
form a diaphragm portion; impregnating a second thermosetting resin in a portion to be an edge
portion of the base; Curing the foaming resin and foaming at the same time to form an edge
portion.
[0017]
DETAILED DESCRIPTION OF THE INVENTION The speaker member of the present invention has
a diaphragm portion and an edge portion.
That is, the speaker member of the present invention is integrated and simultaneously has the
function of the diaphragm and the function of the edge.
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[0018]
The diaphragm portion includes a substrate and a first thermosetting resin impregnated in the
substrate.
The substrate may be woven or non-woven.
Typically, non-woven fabric is used.
The non-woven fabric substrate may be a single non-woven fabric or may be a laminate having a
plurality of non-woven fabric layers.
The non-woven fabric is formed of any suitable staple fiber.
Typical examples of such short fibers include para-aramid fibers, meta-aramid fibers, rayon
fibers, cotton fibers, ultra-high strength polyethylene fibers, polyarylate fibers, and short fibers
from silk yarn.
Para-aramid fibers are preferred because they have high internal loss and excellent strength.
The fiber length of the short fibers may vary depending on the purpose, but is typically 30 to 60
mm.
The nonwoven fabric may be formed of a single staple fiber, or may be formed by combining two
or more types of staple fibers.
[0019]
Any appropriate thermosetting resin may be used as the first thermosetting resin to be
impregnated into the substrate, but is preferably an unsaturated polyester resin.
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It is because it cures in the shortest time.
Thermoset resins (eg, unsaturated polyester resins) suitable as the first thermoset resin are
commercially available in the form of liquid compositions and in many products. Thus, as used
herein, the term "thermosetting resin" includes both the thermosetting resin alone and the
thermosetting resin composition.
[0020]
The edge portion includes the same base material as the diaphragm portion and includes a
second thermosetting resin different from the first thermosetting resin. Typically, the second
thermosetting resin is a hydroxyl group-terminated polybutadiene represented by the following
formula (I): where n is an integer of 500 to 5000, preferably an integer of 1000 to 3000. This is
because a speaker member having excellent vibration absorption can be obtained. Further, a is
0.1 to 0.6, preferably 0.2 to 0.4, b is 0.1 to 0.6, preferably 0.2 to 0.4, and c is 0. 0.4 to 0.8,
preferably 0.5 to 0.6. This is because a speaker member having excellent flexibility can be
obtained. The sum of a, b and c is 1.
[0021]
Preferably, the hydroxyl group-terminated polybutadiene is crosslinked via a polyisocyanate
compound. Representative examples of the polyisocyanate compound include methylene
diphenyl diisocyanate, tolylene diisocyanate, xylylene diisocyanate, naphthylene 1,5-diisocyanate,
tetramethylxylene diisocyanate, isophorone diisocyanate, hydrogenated xylylene diisocyanate,
dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, There may be mentioned dimer
acid diisocyanate, trimethylhexamethylene diisocyanate and norbornene diisocyanate. Methylene
diphenyl diisocyanate and tolylene diisocyanate are preferred, and methylene diphenyl
diisocyanate is particularly preferred. This is because a speaker member having excellent
flexibility can be obtained.
[0022]
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Alternatively, the hydroxyl group-terminated polybutadiene is crosslinked via a melamine
compound. Preferably, the melamine compound is represented by the following formula (II):
wherein each of R 1 to R 6 is independently hydrogen, CH 2 OH or CH 2 ORa; and each Ra is
independently 1 to 4 It is a linear or branched alkyl group having a carbon atom. Preferably, at
least one of R1 and R2, at least one of R3 and R4, and at least one of R5 and R6 are each
independently CH2OH or CH2ORa. More preferably, all of R 1 to R 6 are CH 2 OH or CH 2 ORa.
Most preferably, all of R 1 to R 6 are CH 2 ORa. Here, in each case, Ra is preferably a linear alkyl
group having 1 to 4 carbon atoms, more preferably n-propyl group or n-butyl group, and
particularly preferably n -Butyl group. By using a melamine compound having such a chemical
structure, a very flexible edge portion can be obtained.
[0023]
Preferably, the edge portion is foamed by a gas by-produced in the crosslinking reaction of the
hydroxyl group-terminated polybutadiene and the melamine compound. For example, when the
melamine compound is such that all of R 1 to R 6 in the above formula (II) are represented as CH
2 ORa, the crosslinking reaction between the hydroxyl group-terminated polybutadiene and the
melamine compound is represented by the following reaction formula Ru. Therefore, for example,
when all of R 1 to R 6 are methyl groups, the by-product gas is methanol, and when all of R 1 to
R 6 are n-butyl groups, the by-product gas is n − It is butanol. When Ra is different in each of R1
to R6, the by-product gas is a mixed gas. It is needless to say that even if at least one of R 1 to R
6 is hydrogen or CH 2 OH, the desired foaming is achieved because water vapor is by-produced.
[0024]
Preferably, the foaming ratio of the edge portion is 3 to 5 times, more preferably 3.5 to 4.5 times,
and most preferably about 4 times. If it is less than 3 times, the rigidity is too high, so the
vibration absorption is insufficient. If it exceeds 5 times, air bubbles are likely to be continuous
and air permeability appears, so that in the obtained speaker, the sound wave on the back
surface moves forward and the sound pressure decreases. The expansion ratio of the edge
portion can be easily controlled by adjusting the mold clearance at the time of molding.
[0025]
Preferably, the weight ratio of the hydroxyl group-terminated polybutadiene to the melamine
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compound is in the range of 90/10 to 60/40, more preferably in the range of 80/20 to 60/40,
and most preferably about 70/30. It is. If the weight ratio of the melamine compound is less than
90/10, the edge portion often does not cure sufficiently, and even if it cures, the edge portion
often vents. When the weight ratio of the melamine compound is more than 60/40, the edge
portion is often too hard to obtain appropriate edge compliance.
[0026]
Hereinafter, with reference to FIG. 1, the manufacturing method of the member for speakers by
the preferable embodiment of this invention is demonstrated.
[0027]
First, a substrate 1a is formed.
For example, if the substrate is a single nonwoven, the nonwoven is formed from the short fibers
using any suitable method. As a representative example of the method of forming the non-woven
fabric, a fluid entanglement method using a liquid such as water or a gas such as air or a method
of mechanically intertwining short fibers may be mentioned. Fluid entanglement is preferred in
that a non-woven fabric having a small anisotropy of elastic modulus and good formability can be
obtained. For example, the non-woven fabric can be obtained by randomly orienting the short
fibers by an air flow by a dry method to form an accumulation layer, and then entangleing the
fibers of the accumulation layer by a water flow method. Although the fabric weight of the
nonwoven fabric used for this invention may change according to the objective, it is 30-150 g /
m <2> typically.
[0028]
Hereinafter, the case where the substrate is a single non-woven fabric will be described (it goes
without saying that the method of the present invention can be applied to other types of
substrates as well). As shown in FIG. 1, the non-woven fabric substrate 1 a is prepared by being
wound around the supply device 1 in a roll, and is delivered from the supply device 1 according
to the flow of the process. In order to prevent deformation at the time of molding, the clamp 2
movably supports both sides with respect to the feeding direction of the fed-out nonwoven fabric
substrate 1a.
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[0029]
Next, the first thermosetting resin (for example, unsaturated polyester resin) is selectively
supplied from the resin supply nozzle 3a to the portion of the nonwoven fabric substrate 1a to be
the diaphragm, and at the same time, the second thermosetting resin A resin (typically, hydroxylterminated polybutadiene) is selectively supplied from the resin supply nozzle 3b to a portion
that is to be an edge of the substrate 1a. These thermosetting resins may be supplied to only one
side of the substrate 1a, or may be supplied from both sides of the substrate (in FIG. 1, when
supplied to only one side of the substrate 1a) Is illustrated).
[0030]
Next, the non-woven fabric substrate is heat-pressed using the upper mold 4a and the lower mold
4b having a shape in which the diaphragm portion and the edge portion are integrated. As a
result, the diaphragm portion 5 and the edge portion 6 are simultaneously formed by
impregnating and curing the two types of thermosetting resins. Of course, the diaphragm portion
5 and the edge portion 6 may be formed sequentially.
[0031]
Preferably, the second thermosetting resin is crosslinked and cured via a crosslinking agent (that
is, the second thermosetting resin is supplied at a predetermined position together with the
crosslinking agent). As a crosslinking agent, a polyisocyanate compound and a melamine
compound are mentioned, for example. When a melamine compound is used as the crosslinking
agent, the edge portion is cured and foamed by a by-product gas of the crosslinking reaction. The
expansion ratio can be easily controlled by adjusting the mold clearance (the gap between the
upper mold 4a and the lower mold 4b).
[0032]
In addition, the conditions of the hot press (for example, mold temperature, press pressure, press
time, mold clearance) may be any suitable conditions depending on the purpose, the
thermosetting resin to be used, the crosslinking agent, etc. obtain.
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[0033]
Finally, die cutting and peripheral cutting are performed to obtain a speaker member 7.
[0034]
The speaker diaphragm of the present invention is applicable to any speaker (for example, a
speaker for bass, medium sound, and high sound), and can be used as a full band (full range)
speaker.
The shape of the diaphragm may also be any suitable shape (e.g., cone, dome, flat).
[0035]
Hereinafter, the operation of the present invention will be described.
According to the present invention, since the same base material is used for the diaphragm
portion and the edge portion, it is not necessary to bond the diaphragm and the edge as in the
prior art. Thus, the disadvantages of the prior art in that the durability and water resistance of
the bonded portion are insufficient are eliminated. In fact, the speaker member of the present
invention has sufficient durability and water resistance to be put to practical use as a vehiclemounted speaker that requires excellent durability and water resistance. Furthermore, according
to the present invention, the diaphragm portion and the edge portion are selectively impregnated
with the predetermined thermosetting resin, so that both the diaphragm portion and the edge
portion that require contradictory characteristics are satisfied. Properties are obtained. That is,
the diaphragm portion of the speaker member of the present invention has excellent strength,
and the edge portion has excellent flexibility and internal loss. In addition, since the member for
a speaker of the present invention uses a thermosetting resin for both the diaphragm portion and
the edge portion, the heat resistance is extremely excellent.
[0036]
Furthermore, according to the manufacturing method of the present invention, since the
diaphragm portion and the edge portion are formed of the same base material, material loss and
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the number of manufacturing steps are significantly reduced. As a result, the production method
of the present invention is low in cost and excellent in production efficiency.
[0037]
EXAMPLES The present invention will be specifically described by way of the following examples,
but the present invention is not limited to these examples. In the Examples and Comparative
Examples, parts and percentages are by weight unless otherwise indicated.
[0038]
Example 1 An unsaturated polyester solution having the following composition was prepared:
unsaturated polyester resin (manufactured by Nippon Shokubai Co., Ltd .; N 350 L): 100 (parts)
mica (manufactured by Kuraray Co., Ltd .; CLARITE MICA 600 W): 10 Low-Shrinkage Agent
(Nippon Yushi Co., Ltd .; Modiper S 501): 5 Pigment (Sumitomo Color Co., Ltd .; Black): 10 Per
Octa O (Nippon Yushi Co., Ltd.): 3 Liquid Rubber with the Following Composition The
composition was prepared: hydroxyl-terminated polybutadiene: 100 (parts) (made by Idemitsu
Petrochemical Co., Ltd .; R-45 HT) Stearic acid: 10 anti-aging agent (made by BASF Co., Ltd .;
UVA-635 L): 0.3 carbon Black: 6 catalyst (dibutyltin dilaurate): 0.05 liquid modified MDI
(manufactured by Nippon Polyurethane Industry Co., Ltd.): 12.3 Furthermore, such a liquid
rubber composition has the following characteristics after curing: The hardness was: 48 (JIS A
According) specific gravity: 0.857 elongation at break 425% Glass transition temperature: -55 °
C
[0039]
On the other hand, after short fibers of para-type aramid fiber (Teijin Ltd., Technora; fiber length
38 mm) are randomly oriented by an air flow by a dry method to form an accumulation layer, the
fibers are further machined by water flow entanglement It was entwined to make a non-woven
fabric weighing 60 g / m 2.
[0040]
The above-mentioned unsaturated polyester solution was selectively applied at a density of about
125 to 150 g / m 2 to the central part (that is, the part to be a diaphragm) of this nonwoven
fabric.
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Furthermore, the liquid rubber composition was applied in a donut shape at a density of about
60 to 120 g / m 2 on the outside of the central part (that is, the part to be an edge).
[0041]
Next, using a matched die mold having a shape in which the diaphragm portion and the edge
portion are integrated, heat pressing is performed for 3 minutes at 130 ° C., and after curing is
further performed at 100 ° C. for 30 minutes. A speaker member having a diameter of 16 cm
and a thickness of 0.25 mm was obtained.
[0042]
Young's modulus, density, and specific modulus were measured by the usual method for the
diaphragm portion of the obtained speaker member, and Young's modulus, density, and internal
loss were measured by the usual method for the edge portion. .
The measurement results are shown in Table 1 below together with the results of Examples 2 to
5 and Comparative Examples 1 to 3 described later.
[0044]
Example 2 A speaker member was obtained in the same manner as in Example 1 except that a
non-woven fabric was prepared from a meta-type aramid fiber (manufactured by Teijin Limited,
Cornex; fiber length 38 mm).
The obtained speaker member was subjected to the same evaluation as in Example 1. The results
are shown in Table 1 above.
[0045]
Example 3 A speaker member was prepared in the same manner as in Example 1 except that a
rayon fiber non-woven fabric (manufactured by Nippon Byuren Co., Ltd., XL-6040; fiber length
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38 mm, basis weight 40 g / cm 2) was used as a substrate. Obtained. The obtained speaker
member was subjected to the same evaluation as in Example 1. The results are shown in Table 1
above.
[0046]
Example 4 A speaker member was prepared in the same manner as in Example 1 except that a
cotton fiber non-woven fabric (manufactured by Nisshinbo Co., Ltd., Oikos / AP 1040; fiber
length 38 mm, basis weight 60 g / cm 2) was used as a substrate. Obtained. The obtained
speaker member was subjected to the same evaluation as in Example 1. The results are shown in
Table 1 above.
[0047]
Example 5 A silk thread was refined with weak alkaline hot water to refine it to a sericin content
of less than 1%. A nonwoven fabric (40 g / cm 2 in basis weight) was produced from the short
fibers (fiber length 58 mm) of this silk yarn and used as a substrate. The following procedure was
performed in the same manner as in Example 1 to obtain a speaker member. The obtained
speaker member was subjected to the same evaluation as in Example 1. The results are shown in
Table 1 above.
[0048]
Comparative Example 1 From a pulp suspension, a cone and a roll-shaped edge were formed on
the outer periphery of the cone by a conventional method, and the resultant was heat-pressed
and formed. Next, an acrylic resin was applied to the edge portion and dried to obtain an edge
integrated pulp cone diaphragm having a diameter of 16 cm and a thickness of 0.85 mm. The
obtained diaphragm was subjected to the same evaluation as in Example 1. The results are shown
in Table 1 above.
[0049]
Comparative Example 2 The diaphragm portion is formed of polypropylene resin (containing
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30% by weight of mica) by two-color molding of injection molding, and an olefin-based elastomer
is formed on the outer periphery thereof into an edge shape. An integrated diaphragm of 0.28
mm thick polypropylene cone / olefin elastomer edge was obtained. The obtained diaphragm was
subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.
[0050]
Comparative Example 3 A roll edge integrated dome having a diameter of 25 mm by heat press
forming a titanium foil having a thickness of 50 μm with a matched die mold in which a dome
shaped diaphragm portion and a roll shaped edge portion are integrated on the outer periphery
thereof. I got a diaphragm. The obtained diaphragm was subjected to the same evaluation as in
Example 1. The results are shown in Table 1 above.
[0051]
Example 6 An unsaturated polyester solution having the following composition was prepared:
unsaturated polyester resin (manufactured by Nippon Shokubai Co., Ltd .; N 350 L): 100 (parts)
mica (manufactured by Kuraray Co., Ltd .; CLARITE MICA 600 W): 10 Low-Shrinkage Agent
(Nippon Yushi Co., Ltd .; Modiper S 501): Five Pigments (Sumitomo Color Co., Ltd .; Black): 10 Per
Octa O (Nippon Yushi Co., Ltd.): 3 The composition was prepared: hydroxyl-terminated
polybutadiene: 70 (parts) (Idemitsu Petrochemical Co., Ltd .; R-45 HT) melamine resin (Mitsui
Cytec Co., Ltd .; Saimel 303): 30 stearic acid: 10 anti-aging agent (10 BASF Ltd .; UVA-635L): 0.3
carbon black: 6 catalyst (dibutyltin dilaurate): 0.05 aromatic sulfonic acid: 0.3 Furthermore, such
a liquid rubber composition is cured and foamed (About 4 times) after : Hardness: 20 (according
to JIS A) Specific gravity: 0.225 Elongation at break: 315% Glass transition temperature: -55 ° C
[0052]
On the other hand, after short fibers of para-type aramid fiber (Teijin Ltd., Technora; fiber length
38 mm) are randomly oriented by an air flow by a dry method to form an accumulation layer, the
fibers are further machined by water flow entanglement It was entwined to make a non-woven
fabric weighing 60 g / m 2.
[0053]
The above-mentioned unsaturated polyester solution was selectively applied at a density of about
125 to 150 g / m 2 to the central part (that is, the part to be a diaphragm) of this nonwoven
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fabric.
The diaphragm part was shape | molded by heat-pressing this nonwoven fabric for 1 minute at
130 degreeC using the matched-die metal mold which has cone shape.
[0054]
Next, the liquid rubber composition was applied in a donut shape at a density of about 60 to 120
g / m 2 on the outside of the molded diaphragm part (that is, the part to be an edge).
Furthermore, the edge part was shape | molded by heat-pressing at 190 degreeC for 1 minute
using the edge shape matched die metal mold | die. Here, preliminary molding was performed by
setting the mold clearance to 0.2 mm in the first half of 30 seconds, and the mold clearance was
set to 0.8 mm in the second half of 30 seconds to foam approximately four times. . Thus, a
speaker member was obtained, in which the diaphragm portion had a diameter of 16 cm and a
cone shape with a thickness of 0.25 mm, and the edge portion had a roll shape with a width of
13 mm and a thickness of 0.8 mm.
[0055]
Young's modulus, density, and specific modulus were measured by the usual method for the
diaphragm portion of the obtained speaker member, and Young's modulus, density, and internal
loss were measured by the usual method for the edge portion. . The measurement results are
shown in Table 2 below together with the results of Examples 7 to 10 described later.
[0057]
EXAMPLE 7 A speaker member was obtained in the same manner as in Example 6, except that a
non-woven fabric was prepared from a meta-type aramid fiber (manufactured by Teijin Ltd.,
Conex; fiber length 38 mm). The obtained speaker member was subjected to the same evaluation
as in Example 6. The results are shown in Table 2 above.
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[0058]
Example 8 A speaker member was prepared in the same manner as in Example 6 except that
rayon fiber non-woven fabric (manufactured by Nippon Byuren Co., Ltd., XL-6040; fiber length
38 mm, basis weight 40 g / cm 2) was used as a substrate. Obtained. The obtained speaker
member was subjected to the same evaluation as in Example 6. The results are shown in Table 2
above.
[0059]
Example 9 A speaker member was prepared in the same manner as in Example 6 except that a
cotton fiber non-woven fabric (manufactured by Nisshinbo Co., Ltd., Oikos / AP 1040; fiber
length 38 mm, basis weight 60 g / cm 2) was used as a substrate. Obtained. The obtained
speaker member was subjected to the same evaluation as in Example 6. The results are shown in
Table 2 above.
[0060]
Example 10 A silk thread was refined with weak alkaline hot water to refine the sericin content
to less than 1%. A nonwoven fabric (40 g / cm 2 in basis weight) was produced from the short
fibers (fiber length 58 mm) of this silk yarn and used as a substrate. The following procedure was
performed in the same manner as in Example 6 to obtain a speaker member. The obtained
speaker member was subjected to the same evaluation as in Example 6. The results are shown in
Table 2 above.
[0061]
As is apparent from the description of Examples 1 to 10, in the method for manufacturing a
speaker member according to the present invention, the diaphragm portion and the edge portion
are formed using the same base material, so that the material loss is small and the manufacturing
process The number can be reduced. Therefore, the cost is low and the manufacturing efficiency
is excellent.
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[0062]
Furthermore, as is apparent from Tables 1 and 2, in the speaker member of the present
invention, although the diaphragm portion and the edge portion are formed using the same base
material, the diaphragm portion is strong. Excellent, flexible at the edge and excellent in internal
loss. As described above, according to the present invention, it is possible to form the diaphragm
and the edge, which require contradictory characteristics, by using the same base material, and it
is possible to solve the problem that has not been solved for a long time.
[0063]
In addition to the above, it was actually confirmed that the speaker member of the present
invention has the following advantages. As compared with the edge-integrated pulp cone
diaphragm (comparative example 1), since the speaker member of the present invention belongs
to FRP, the water resistance and durability required of the on-vehicle speaker are extremely
excellent. Furthermore, while the edge integrated pulp cone diaphragm needs air venting of the
edge, the member for a speaker of the present invention does not require air venting by using a
liquid rubber composition (hydroxyl group-terminated polybutadiene), and the manufacture
thereof The number of processes can be reduced. As compared with the two-color molded
integral diaphragm (comparative example 2), since the two-color molded diaphragm can only use
a thermoplastic resin, its heat resistance is insufficient, whereas the speaker member of the
present invention Since a thermosetting resin is used, the heat resistance is excellent. As
compared with the integrated diaphragm using the metal foil (Comparative Example 3), the
diaphragm has insufficient flexibility at the edge portion, so sufficient amplitude can not be
obtained, and as a result, only the high frequency range can be reproduced. On the other hand, in
the speaker member of the present invention, since the diaphragm portion is excellent in
strength and the edge portion is excellent in flexibility, a sufficiently large amplitude is obtained,
and as a result, it is used for a full band (full range) speaker Can.
[0064]
As described above, according to the present invention, the predetermined thermosetting resin is
selectively applied to the portion to be the diaphragm portion of the substrate and the portion to
be the edge portion. The diaphragm part and the edge part can be formed using the same base
material, and the speaker member having the required characteristics in which both the
diaphragm part and the edge part are excellent can be obtained. Furthermore, according to the
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present invention, it is possible to obtain a manufacturing method which is low in cost and
excellent in manufacturing efficiency.
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