close

Вход

Забыли?

вход по аккаунту

?

JP2002078076

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2002078076
[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 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, a diaphragm and an 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 the flexibility to follow the movement
of the diaphragm and the vibration absorption to be able to absorb the vibration without
reflecting the sound wave propagated through the diaphragm. 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.
11-05-2019
1
[0003]
[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 the pulp cone is formed. However,
in this technique, a resin layer must be specially provided on the edge in order to prevent the
ventilation of the edge and 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, a sufficient amplitude can not be obtained, and the
vibration absorption of the edge is hardly present, so that a speaker that can withstand practical
use in the full range 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.
[0007]
11-05-2019
2
SUMMARY OF THE INVENTION The present invention has been made to solve the abovedescribed conventional problems, and the object of the present invention is that the diaphragm
portion and the edge portion are made of the same material (the same material (the same
material). It is an object of the present invention to provide a speaker member which is formed
using a base material and which has both excellent requirements for the diaphragm portion and
the edge portion.
[0008]
[Means for Solving the Problems] 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 that heat containing foamable particles in the diaphragm part By
using a curable resin and using foamed rubber in the edge portion, the diaphragm portion and
the edge portion can be formed using the same base material, and both the diaphragm portion
and the edge portion are required to be excellent It has been found that a speaker member
having characteristics can be obtained, and the present invention has been completed.
The speaker member of the present invention has a diaphragm portion and an edge portion.
The diaphragm portion includes at least two base layers impregnated with a thermosetting resin,
and a foamed resin layer disposed between the base layers and including the same thermosetting
resin as the base layer. The edge portion has a base layer common to the diaphragm portion and
a foamed rubber layer disposed between the base layers. In a preferred embodiment, the
thermosetting resin is an unsaturated polyester resin. In a preferred embodiment, the foamed
resin layer comprises hollow particles having an average particle size of 10 μm to 20 μm.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION A 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.
[0010]
11-05-2019
3
The diaphragm portion has at least two substrate layers and a foamed resin layer disposed
between the substrate layers. The substrate constituting the substrate layer may be a woven or
non-woven fabric. 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
nonwoven fabric (layer) is formed of any suitable staple fiber. Typical examples of such short
fibers include para-aramid fibers, meta-aramid fibers, rayon fibers, cotton fibers, tencel fibers,
ultra-high strength polyethylene fibers, and polyarylate fibers. Cotton fibers and tencel 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 (layer) may be formed of a single staple fiber, or may be formed by combining two or more
types of staple fibers.
[0011]
Alternatively, the non-woven fabric substrate may be a non-woven fabric composed of
elastomeric fibers (hereinafter also referred to as an elastomeric non-woven fabric). Here, the
elastomer nonwoven fabric refers to a nonwoven fabric in which thermoplastic elastomer fibers
are randomly intertwined and a part thereof is melted. Representative examples of thermoplastic
elastomer fibers include polyurethane elastomer fibers, polyamide elastomer fibers, polystyrene
elastomer fibers, polyamide elastomer fibers, and polyester elastomer fibers. Since the
elastomeric nonwoven fabric can be easily impregnated with the thermosetting resin, a speaker
member having an excellent elastic modulus can be obtained. Furthermore, since the elastomer
nonwoven fabric contains many voids (air portions) inside, the thickness per unit area becomes
large, and as a result, a speaker member having excellent rigidity can be obtained.
[0012]
Alternatively, the substrate may be a woven fabric. Preferably, the woven fabric substrate is an
elastic woven fabric consisting of saturated polyester fibers. Here, the elastic woven fabric refers
to an elastic (that is, stretchable) woven fabric. More preferably, the woven substrate comprises
poly (trimethylene terephthalate) fibers. Because poly (trimethylene terephthalate) has very good
internal loss, the result is a speaker member with very good internal loss.
[0013]
11-05-2019
4
The non-woven fabric substrate, the laminate substrate, the elastomeric non-woven fabric
substrate or the woven fabric substrate may be appropriately selected depending on the purpose.
[0014]
The base material layer is impregnated with a thermosetting resin.
As such a thermosetting resin, although any appropriate thermosetting resin is used, Preferably it
is unsaturated polyester resin. It is because it cures in the shortest time. Any suitable unsaturated
polyester resin is used in the present invention. Thermosetting resins (e.g. unsaturated polyester
resins) are in the form of liquid compositions and many products are commercially available.
[0015]
Preferably, such a thermosetting resin composition may further contain natural fibers,
regenerated fibers or short fibers of synthetic fibers, or a mixture of these (hereinafter also
referred to as additive fibers). The additive fiber has a fiber length of 20 mm or less, preferably 5
mm or less (note that the practically shortest fiber length is 1 mm). The shorter the fiber length
of the additive fiber, the better the partial acidity in the thermosetting resin, and as a result, the
better the impregnating property to the substrate. Therefore, the fiber length of the additive fiber
should be as short as possible in consideration of the balance between the impregnating property
and the elastic modulus of the obtained speaker member (that is, the longer the fiber length, the
better the elastic modulus can be contributed).
[0016]
Representative examples of natural fibers include cotton and hemp. Representative examples of
the regenerated fiber include rayon and polynozic. Representative examples of synthetic fibers
include nylon, vinylon, aramid fibers, carbon fibers, polyarylate fibers, and heterocyclecontaining aromatic fibers. Highly elastic fibers such as aramid fibers, carbon fibers, polyarylate
fibers, and hetero ring-containing aromatic fibers are preferred. It is because the member for
speakers excellent in elastic modulus is obtained.
11-05-2019
5
[0017]
Preferably, the short fibers may be contained in the thermosetting resin composition in a
proportion of 5 to 30 parts by weight, more preferably 10 to 15 parts by weight with respect to
100 parts by weight of the thermosetting resin. When the short fibers are added to the
thermosetting resin composition in such a range, both the impregnating property and the elastic
modulus of the obtained speaker member are excellent.
[0018]
The thermosetting resin composition may further contain any suitable additive (for example, a
filler, an antioxidant, an ultraviolet light absorber).
[0019]
The foamed resin layer contains the same thermosetting resin as the thermosetting resin
impregnated in the base layer, and foamed hollow particles.
The hollow particles may be any suitable expandable particles. Preferably, such expanded hollow
particles have an average particle size (1.1 to 7 times in expansion ratio) of 10 μm to 20 μm.
The expansion ratio of hollow particles can be easily controlled by adjusting the mold clearance
at the time of molding.
[0020]
The edge portion includes a base layer common to the diaphragm portion and a foamed rubber
layer. The foamed rubber layer contains a rubber component and a foamed component. Any
appropriate rubber component may be used as the rubber component. Representative examples
of the rubber component include natural rubber (NR), styrene butadiene rubber (SBR), butadiene
rubber (BR), isoprene rubber (IR), ethylene propylene rubber (EPDM), nitrile butadiene rubber
(NBR), Ethylene propylene terpolymer rubber (EPT), chloroprene rubber (CR), isobutylene
isoprene rubber (IIR), silicone rubber and the like. Any appropriate foamable particles may be
employed as the foam component. Representative foaming components include organic blowing
agents such as azodicarboside acid. Preferably, the foamable component has an average particle
11-05-2019
6
size of 10 μm to 30 μm (1.1 to 15 times by foaming ratio) after foaming.
[0021]
Hereinafter, a method of manufacturing a speaker member according to a preferred embodiment
of the present invention will be described.
[0022]
First, the substrate constituting the substrate layer 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.
[0023]
The following description will be made on the case where two non-woven fabric base layers are
adopted (the method of the present invention is similarly applied to the case where the base
material layer is three or more layers or the woven base material). It goes without saying that
you get it).
[0024]
First, a thermosetting resin containing foamable particles is applied to a portion of one nonwoven fabric to be a diaphragm.
The amount of thermosetting resin applied may vary depending on the purpose, but is typically
11-05-2019
7
100 to 170 g / m 2. Here, the expandable particles are contained in the composition in a ratio of
preferably 10 to 30 parts by weight, and more preferably 15 to 25 parts by weight with respect
to 100 parts by weight of the thermosetting resin. If the content is less than this range, there is a
problem that a speaker member having a desired edge portion can not be obtained because
foaming is insufficient. If the content is more than this range, deformation may occur during
molding.
[0025]
Next, another non-woven fabric is placed on the non-woven fabric coated with the thermosetting
resin. After preforming at any appropriate conditions (eg, 130 ° C., 20 seconds), mold clearance
is set at predetermined intervals and foamable at any appropriate conditions (eg, 120 ° C., 30
seconds) Allow the particles to foam. The preferable expansion ratio is 1.1 to 7 times, and the
mold clearance at this time is 0.1 to 0.2 mm. This operation can be easily performed by moving
only the mold corresponding to the diaphragm portion. By such an operation, the thermosetting
resin is impregnated into the two non-woven fabrics, and the foamed hollow particles remain
between the two non-woven fabrics. As a result, a diaphragm portion including two base material
layers and a foamed resin layer disposed between the base material layers is formed.
[0026]
Next, an edge portion is formed. Specifically, a composition including a rubber component and a
foaming component is supplied between two non-woven fabrics in the peripheral portion of the
diaphragm portion supported by the lower mold. For example, when the composition is solid, the
composition cut into a predetermined shape is placed between two non-woven fabrics. If the
composition is a liquid, the composition is applied between two non-wovens. The composition is
then foamed to form a foamed rubber layer by transferring only the mold corresponding to the
edge portion and heating under any appropriate conditions (for example, 200 ° C., 45 seconds).
In this way, an edge portion having two base layers and a foamed rubber layer is obtained.
[0027]
Finally, die cutting and peripheral cutting are performed to obtain a speaker member.
[0028]
11-05-2019
8
The loudspeaker diaphragm of the present invention is applicable to any loudspeaker (for
example, loudspeakers for bass, medium and high tones), and can be used as a full band (full
range) loudspeaker.
The shape of the diaphragm may also be any suitable shape (e.g., cone, dome, flat).
[0029]
The operation of the present invention will be described below. 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 vehicle-mounted speaker that requires excellent
durability and water resistance. Further, according to the present invention, since the
thermosetting resin containing the expandable particles is used for the diaphragm portion and
the foamed rubber is used for the edge portion, the diaphragm portion and the edge portion
which require contradictory characteristics are Satisfactory properties are obtained in both. 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. Furthermore, according to the
present invention, when the diaphragm portion includes the foamed resin layer, the bending
strength of the diaphragm portion is significantly improved, and by using the foamed rubber for
the edge portion, the tensile strength of the edge portion is also increased. It can be significantly
improved. In addition, since the member for a speaker of the present invention uses a
thermosetting resin, it is also excellent in heat resistance. Furthermore, according to the present
invention, the step of attaching the edge portion using an adhesive is not necessary, so that an
inexpensive and highly reliable speaker member can be obtained.
[0030]
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.
11-05-2019
9
[0031]
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 reducing agent (NIPO
Yushi Co., Ltd .; Modiper S 501): 5 Per Octa O (NIPO Yushi Co., Ltd.): 3 foamable particles
(Matsumoto Yushi-Seiyaku Co., Ltd .; F-30D): 20 while After short fibers of cotton fiber
(Nisshinbo Co., Ltd., Oikos; fiber length 51 mm) are randomly oriented by an air flow by a dry
method to form an accumulation layer, the fibers are mechanically joined together according to a
water flow method. It was entangled to make a non-woven fabric weighing 40 g / m 2. Using the
two non-woven fabrics obtained above, the above unsaturated polyester solution is selectively
coated at a density of about 125 to 150 g / m 2 on the central part (that is, the part to be a
diaphragm) of one non-woven fabric thereof. , I placed another non-woven fabric on it.
[0032]
The obtained nonwoven fabric laminate was heat-pressed using a matched die mold having a
shape in which the diaphragm portion and the edge portion were integrated, to obtain a speaker
member. Here, as the matched die mold, one in which the diaphragm portion and the edge
portion move independently of each other was used. The detailed molding procedure is as
follows.
[0033]
First, only the mold corresponding to the diaphragm portion was moved, and the diaphragm
portion was preformed by hot pressing at 130 ° C. for 20 seconds. Next, the upper mold was
moved to a mold clearance of 0.1 to 0.2 mm, and the expandable particles were foamed by
heating at 150 ° C. for 30 seconds. By this operation, the unsaturated polyester resin is
impregnated into the two non-woven fabrics, and the foamed hollow particles remain between
the two non-woven fabrics. As a result, a diaphragm portion including two base material layers
and a foamed resin layer disposed between the base material layers was obtained.
[0034]
11-05-2019
10
Next, a rubber composition having the following composition was supplied between the two nonwoven fabrics in the peripheral portion of the diaphragm portion supported by the lower mold.
Further, the composition was foamed to form a foamed rubber layer by moving only the mold
corresponding to the edge portion and heating at 200 ° C. for 45 seconds. The die clearance at
this time was 0.3 to 0.5 mm. SBR 100 (parts) paraffinic process oil 40 organic foaming agent
(azodicarboside acid) 15 sulfur 1.5 zinc flower 5 stearic acid 1 talc 40 carbon 30 vulcanization
accelerator (tetramethylthiuram disulfide) 5 foaming auxiliary agent (urea 10) Anti-aging agent
(2,4-bis {(octylthio) methyl} -O-cresol) 1 UV absorber (hydroxyphenyl benzene triazole derivative)
1
[0035]
As described above, a speaker member was obtained. The diaphragm portion of the obtained
member for a speaker had a cone shape with a diameter of 16 cm and a thickness of 0.35 mm,
and the edge portion had a roll shape with a width of 20 mm and a thickness of 0.5 mm.
[0036]
The Young's modulus, density and specific modulus of elasticity of the diaphragm portion of the
obtained speaker member are measured by the usual method, and Young's modulus, density and
internal loss of the edge portion are measured by the usual method. Was measured. The
measurement results are shown in Table 1 below together with the results of Example 2 and
Comparative Examples 1 to 3 described later.
[0037]
[Table 1]
[0038]
Example 2 Except using Tencel fiber (fiber length 38 mm) and using an unsaturated polyester
solution further containing 10 parts of a filler (Asahi Glass Co., Ltd. product; Silka balloon Q-CEL)
A speaker member was obtained in the same manner as in Example 1.
11-05-2019
11
The obtained speaker member was subjected to the same evaluation as in Example 1. The results
are shown in Table 1 above.
[0039]
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 formed into a sheet by heat,
followed by heat press forming. 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.
[0040]
Comparative Example 2 The diaphragm portion is formed of polypropylene resin (containing
30% by weight of mica) by two-color molding of injection molding, and an olefin elastomer is
formed on the outer periphery thereof into an edge shape. An integrated diaphragm of
polypropylene cone / olefin elastomer edge having a diameter of 16 cm and a thickness of 0.28
mm was obtained. The obtained diaphragm was subjected to the same evaluation as in Example
1. The results are shown in Table 1 above.
[0041]
Comparative Example 3 In order to compare only the diaphragm portion, a cone type diaphragm
was manufactured in the following procedure. First, 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 S501): 5 Per Octa O
(Nippon Yushi Co., Ltd.): 3 On the other hand, a short type of para type aramid fiber (Teijin
Limited, Technola; fiber length 51 mm) After forming an accumulation layer by randomly
orienting by an air flow according to the above, the fibers were mechanically entangled by a
water-flow entanglement method to prepare a non-woven fabric having a basis weight of 60 g /
m 2. Using the two non-woven fabrics obtained above, the above unsaturated polyester solution
is selectively coated at a density of about 125 to 150 g / m 2 on the central part (that is, the part
to be a diaphragm) of one non-woven fabric thereof. , I placed another non-woven fabric on it.
11-05-2019
12
The non-woven fabric laminate was hot press-formed at 130 ° C. for 60 seconds, die-cut and
peripheral cutting were performed to obtain a cone-shaped diaphragm. The obtained diaphragm
was subjected to the same evaluation as in Example 1. The results are shown in Table 1 above.
[0042]
As apparent from Table 1 above, 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 excellent in strength, The edge portion is flexible 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.
[0043]
Furthermore, in comparison with the edge-integrated pulp cone diaphragm of Comparative
Example 1, the speaker member of the present invention is actually much more excellent in
durability and water resistance required for an on-vehicle speaker. confirmed. Therefore, the
speaker member of the present invention can be increased in diameter and large in input, which
is impossible with a pulp diaphragm. Moreover, in comparison with the two-color molded
diaphragm of Comparative Example 2, it was confirmed that the member for a speaker of the
present invention has much better heat resistance. As compared with the diaphragm not
including the foamed resin layer of Comparative Example 3, the speaker member of the present
invention has a significantly improved specific elastic modulus.
[0044]
As described above, according to the present invention, vibration is obtained by using a
thermosetting resin containing foamable particles in the diaphragm portion of the substrate and
using foam rubber in the edge portion. A plate member and an edge portion can be formed using
the same base material, and a speaker member having excellent characteristics required for both
the diaphragm portion and the edge portion can be obtained.
11-05-2019
13
Документ
Категория
Без категории
Просмотров
0
Размер файла
25 Кб
Теги
jp2002078076
1/--страниц
Пожаловаться на содержимое документа