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JP2002315092

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DESCRIPTION JP2002315092
[0001]
TECHNICAL FIELD The present invention relates to a member for a speaker. More particularly,
the present invention relates to a speaker member in which parts are firmly fixed without using
any appliance or adhesive.
[0002]
2. Description of the Related Art Generally, in a speaker, a diaphragm and an edge are formed
using 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 fixing them in order to satisfy the contradictory performance requirements for the
diaphragm and the edge. For example, the edge made of rubber, thermoplastic elastomer or the
like is attached to a resin or paper diaphragm with an adhesive, or the diaphragm is formed by
two-color molding or insert molding of an edge material on such a diaphragm. It adheres to the
edge.
[0003]
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1
However, such a molded product has insufficient adhesive strength between the diaphragm and
the edge, and as a result, the diaphragm and the edge are often separated or there is a problem
with durability. On the other hand, the speaker unit is not used alone, and is usually attached to a
housing through a frame, attached to an automobile, or incorporated in various devices. In these
cases, the speaker unit is often screwed or bonded. However, such screws and adhesives
excessively propagate the vibration of the speaker to the housing etc. and cause the reflection of
the vibration between the members, so that the sound quality of the obtained speaker is
degraded. In the case where a rubber washer is held in the screwed portion or a buffer material
is held in the contact portion with the housing or the like for the purpose of sound quality
improvement, the number of parts and the number of work processes increase, resulting in cost
increase and work The problem of increased errors arises.
[0004]
As described above, there is a strong demand for a speaker member in which parts are firmly
fixed without using any appliance or adhesive.
[0005]
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 firmly bond parts
without using any appliance or adhesive. And providing a speaker member.
[0006]
The speaker member of the present invention has a diaphragm portion and an edge portion, and
the diaphragm portion and the edge portion are fixed by chemical bonding.
[0007]
In a preferred embodiment, the diaphragm portion is made of a polymer alloy containing
polyphenylene ether represented by the formula (I) and polystyrene, acrylonitrile-butadienestyrene or polyamide, or a polyamide represented by the formula (II) Configured: in the formula
(I), R 1 to R 4 each independently represent hydrogen, a linear or branched alkyl group having 1
to 6 carbon atoms, and at least one of R 1 to R 4 One is an alkyl group, a is an integer of 10 to
10000; in formula (II), R 5 is a substituted or unsubstituted alkylene group having 1 to 6 carbon
atoms, or R 6 is And a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms,
or a phenylene group, and b is an integer of 10 to 5000 Ru.
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2
[0008]
In a preferred embodiment, the edge portion is at least selected from natural rubber, butadienestyrene rubber, butadiene-acrylonitrile rubber, ethylene-propylene rubber, urethane rubber,
acrylic rubber, fluororubber, silicone rubber and their modified rubbers. It is made of rubber
containing one.
[0009]
In a preferred embodiment, the speaker member of the present invention further includes an
arrow plastic fixed by chemical bonding to the edge portion.
[0010]
According to another aspect of the present invention, a method of manufacturing a speaker
member is provided.
The method includes the steps of forming a diaphragm portion and forming an edge portion by
forming a chemical bond between the edge portion and the diaphragm portion when forming the
edge portion. The edge portion and the diaphragm portion are fixed.
[0011]
According to the present invention, another speaker member is provided.
The speaker member has a resin frame portion and a mounting portion, and the resin frame
portion and the mounting portion are fixed by chemical bonding.
[0012]
In a preferred embodiment, the resin frame portion is a polymer alloy containing polyphenylene
ether represented by the formula (I) and polystyrene, acrylonitrile-butadiene-styrene or
polyamide, or polyamide from the formula (II) Configured: in the formula (I), R 1 to R 4 each
independently represent hydrogen, a linear or branched alkyl group having 1 to 6 carbon atoms,
and at least one of R 1 to R 4 One is an alkyl group, a is an integer of 10 to 10000; in formula
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(II), R 5 is a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, or R 6 is A
substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, or a phenylene group,
and b is an integer of 10 to 5,000. It is a number.
[0013]
In a preferred embodiment, the attachment portion is at least selected from natural rubber,
butadiene-styrene rubber, butadiene-acrylonitrile rubber, ethylene-propylene rubber, urethane
rubber, acrylic rubber, fluororubber, silicone rubber and their modified rubbers. It is made of
rubber containing one.
[0014]
According to still another aspect of the present invention, a speaker unit is provided.
The speaker unit includes a diaphragm, a frame including an edge, and an attachment portion,
and the diaphragm, the edge, the edge, the attachment portion, and the attachment portion and
the frame are fixed by chemical bonding. There is.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION The speaker member of the present invention
has a diaphragm portion and an edge portion, and the diaphragm portion and the edge portion
are fixed by chemical bonding.
In other words, in the speaker member according to the present invention, the diaphragm
portion and the edge portion are integrated without an intervening adhesive layer (without using
an adhesive) and without being mechanically fixed. It has been
[0016]
Preferably, the diaphragm portion is made of a polymer alloy containing polyphenylene ether
represented by the formula (I) and polystyrene, acrylonitrile-butadiene-styrene (ABS) or
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polyamide, or a polyamide represented by the formula (II) The above-mentioned polymer alloy
(hereinafter also referred to as polyphenylene ether-based alloy) contains the above-mentioned
polyphenylene ether as a main component.
In the present specification, "main component" means that the component is contained in the
largest amount in the alloy.
For example, in a two-component alloy, it means that the main component is contained in a
proportion of 50% by weight or more in the alloy.
Thus, "polyphenylene ether-based alloy" includes polyphenylene ether itself.
[0017]
In formula (I), R1 to R4 each independently represent hydrogen or a linear or branched alkyl
group having 1 to 6 carbon atoms, and at least one of R1 to R4 is Alkyl group.
Preferably, R 1 to R 4 are each independently hydrogen, a linear or branched alkyl group having
1 to 4 carbon atoms, and at least one of R 1 to R 4 is such an alkyl group It is. More preferably, R
1 to R 4 are each independently hydrogen, methyl group, ethyl group, n-propyl group or i-propyl
group, and at least one of R 1 to R 4 is methyl group, ethyl group, n -Propyl or i-propyl.
Particularly preferably, R 1 to R 4 are each independently hydrogen, a methyl group or an ethyl
group, and at least one of R 1 to R 4 is a methyl group or an ethyl group. Most preferably, R1 and
R2 are hydrogen and R3 and R4 are methyl groups. By having such a substituent, the adhesion
between the diaphragm portion and the edge portion becomes particularly excellent. a is an
integer of 10 to 10000, preferably an integer of 50 to 3000, and more preferably an integer of
100 to 300. By having such a degree of polymerization, a diaphragm portion having excellent
heat resistance and mechanical strength can be obtained.
[0018]
In formula (II), R 5 is an alkylene group having 1 to 6 carbon atoms, or alternatively, at least one
of hydrogen atoms of the alkylene group and the group represented by the above formula (III) is
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a radical It may be substituted by a reactive functional group (eg, a linear or branched alkyl
group). More preferably, R 5 is an unsubstituted alkylene group having 1 to 6 carbon atoms or a
group represented by the above formula (III), particularly preferably an unsubstituted group
having 4 to 6 carbon atoms. It is an alkylene group or a group represented by the above formula
(III), and most preferably a hexamethylene group or a group represented by the above formula
(III). R 6 is an alkylene or phenylene group having 1 to 10 carbon atoms, and at least one of the
hydrogen atoms of the alkylene group and the phenylene group is a radical reactive functional
group (eg, linear or branched) (Optionally substituted alkyl group). More preferably, R 6 is an
unsubstituted alkylene or phenylene group having 1 to 10 carbon atoms, particularly preferably
an unsubstituted alkylene or phenylene group having 7 to 10 carbon atoms, Most preferably, it is
a decamethylene group or a phenylene group. The substituent when the hydrogen atom of R5
and R6 is substituted is preferably a methyl group, an ethyl group, an n-propyl group or an ipropyl group, and more preferably a methyl group or an ethyl group. It is because
polymerization is easy, and as in the case of non-substitution, it can form a chemical bond with
the rubber of the edge portion. b is an integer of 10 to 5000, preferably an integer of 20 to
1000, and more preferably an integer of 30 to 100. By having such a degree of polymerization, a
diaphragm portion having excellent heat resistance and mechanical strength can be obtained.
[0019]
A filler can be added to these polyphenylene ether-based alloys or polyamides as needed.
Examples of the filler include glass fiber, carbon fiber, aramid fiber and mica. Glass fibers and
carbon fibers are preferred. The filler is added in an amount of more than 0 and less than 40
parts by weight, preferably 10 to 30 parts by weight, with respect to 100 parts by weight of the
polymer. Various additives may be further added as needed. Such additives include, for example,
antioxidants, low-shrinkage agents, pigments and anti-aging agents.
[0020]
The polyphenylene ether-based alloy is commercially available from Daicel-Huls under the trade
name "VESTORAN". The polyamide is commercially available from Daicel-Huls under the trade
name "VESTAMID" and from Clearnova under the trade name "TROGAMID".
[0021]
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Preferably, the edge portion is made of rubber. Examples of the rubber used in the present
invention include natural rubber (NR), butadiene rubber (BR), butadiene-styrene rubber (SBR),
butadiene-acrylonitrile rubber (NBR), ethylene-propylene rubber (EPDM), and isoprene rubber (
IR), chloroprene rubber (CR), acid-modified ethylene-propylene rubber (X-EPDM), acid-modified
nitrile rubber (X-NBR), ethylene-acrylate copolymer rubber (EAM), urethane rubber (U), acrylic
Rubber (ACM, ANM), fluororubber (FKM), silicone rubber (VMQ), fluorosilicone rubber (FVMQ)
and their modified rubbers can be mentioned. These rubbers may be used alone or in
combination of two or more. Preferred rubbers or combinations thereof are SBR, NR / SBR, NR /
EPDM, EPDM, EPDM / SBR, NBR / SBR. Particularly preferred rubbers or combinations thereof
are SBR, NR / SBR, EPDM. Such a rubber or a combination thereof is particularly excellent in
adhesion to the diaphragm portion.
[0022]
Depending on the type of rubber, a sulfur-based vulcanizing agent or a peroxide-based
vulcanizing agent is used. For example, for a rubber having a high diffusion rate of unvulcanized
rubber molecules such as SBR and NR / SBR, and a combination thereof, either a sulfur-based
vulcanizing agent or a peroxide-based vulcanizing agent may be used. On the other hand,
peroxide-based vulcanizing agents are used for rubbers such as EPDM and NR, which have a low
diffusion rate of unvulcanized rubber molecules, and combinations thereof. This is because
radicals must be generated to form a chemical bond with the diaphragm portion. Representative
peroxide-based vulcanizing agents include benzoyl peroxide and tert-butyl peroxide.
[0023]
Any appropriate additive may be added to the rubber, as needed. As such additives, reinforcing
materials, softeners, plasticizers, anti-aging agents, vulcanization accelerators, vulcanization
acceleration assistants, foaming agents, etc. may be mentioned.
[0024]
Preferably, the speaker member of the present invention further includes an arrow plastic fixed
by chemical bonding to the edge portion. By providing the arrow plastic, the strength of the
speaker member is improved and deformation is prevented. Moreover, unlike the conventional
arrow plastic and arrow paper, this arrow plastic is fixed to the diaphragm by chemical bonding,
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so the strength is significantly improved and deformation is prevented compared to the
conventional arrow plastic and arrow paper. obtain. Preferably, the arrow plastic is made of the
polyphenylene ether alloy or the polyamide as in the case of the diaphragm portion. The arrow
plastic may be comprised of the same polymer as the diaphragm portion or may be comprised of
a different polymer than the diaphragm portion.
[0025]
The speaker member of the present invention can be widely applied to general speakers in
general, and can be particularly suitably applied to woofers by band and to vehicle speakers by
application. The shape of the member is not particularly limited, and any appropriate shape (for
example, flat, cone, dome) may be adopted as the diaphragm portion, and any suitable shape (for
example, flat shape, Roll shape, gather shape) may be adopted.
[0026]
Next, with reference to FIG. 1, another speaker member of the present invention will be
described. As shown in FIG. 1A, the speaker member 10 has a frame portion 1 and a mounting
portion 2, and the frame portion 1 and the mounting portion 2 are fixed by chemical bonding. In
other words, in the speaker member 10, the frame portion and the mounting portion are
integrated without the intervention of the adhesive layer (without using the adhesive) and
without being mechanically fixed. ing.
[0027]
The frame portion 1 is composed of any suitable resin, preferably composed of the abovementioned polyphenylene ether-based alloy or the above-mentioned polyamide. The mounting
portion 2 is preferably made of the above rubber. In the present invention, the attachment
portion refers to a portion related to securing the other parts or members to the frame.
Therefore, the mounting portion 2 can be a peripheral portion of the screw mounting hole, as
shown, for example, in FIG. 1 (a). Also, for example, when the speaker unit is brought into contact
with the front side of the housing, the mounting portion 2 is a contact portion with the housing
of the frame (that is, the back side portion of the frame) as shown in FIG. obtain. Also, for
example, when the speaker unit is in contact with the back side of the housing, the attachment
portion 2 is a contact portion with the housing of the frame (that is, the front side portion of the
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frame) as shown in FIG. obtain. Also, for example, the attachment portion 2 may be a portion to
which an edge is attached as shown in FIG. Of course, the attachment portion 2 may be provided
at a plurality of places of the portion illustrated in FIGS. 1A to 1D, and provided at a place other
than the illustration portion as far as the attachment of other parts etc. It is also good.
[0028]
The embodiments described above can be combined as appropriate. For example, if the
diaphragm portion and the frame portion are made of the polyphenylene ether alloy or the
polyamide and the edge portion and the mounting portion are made of the rubber, the
diaphragm portion and the edge portion, the edge portion and the mounting portion, and the
mounting The speaker unit in which the part and the frame part are fixed by chemical bonding is
obtained. That is, a speaker unit in which the diaphragm, the edge and the frame are fixed is
obtained without using any adhesive or mechanical fixing means.
[0029]
Hereinafter, the manufacturing method of the member for speakers of this invention is
demonstrated. Here, although a method of manufacturing a member having a diaphragm portion
and an edge portion will be described, it goes without saying that the manufacturing method of
the present invention is also applied to the manufacture of another speaker member (for
example, a frame member). Absent.
[0030]
First, the diaphragm portion is formed by injection molding the polyphenylene ether alloy or the
polyamide into a predetermined shape. Injection molding is carried out under any suitable
conditions depending on the purpose, type of polymer and the like. Typically, the molding
conditions of the modified polyphenylene ether are a mold temperature of 60 to 180 ° C., a
cylinder temperature of 290 to 330 ° C., and an injection pressure of 800 to 1800 bar. The
polyamide molding conditions are a mold temperature of 80 to 140 ° C, cylinder temperature
230-260 ° C, injection pressure 800-1800 bar.
[0031]
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Next, the edge portion is formed by injection molding and vulcanization of the rubber. Injection
molding of rubber may be performed in the manner of two-color molding or may be performed
in the manner of insert molding. A chemical bond is formed at the contact portion between the
diaphragm portion (polyphenylene ether alloy or polyamide) and the edge portion (rubber) at the
time of vulcanization, so that the diaphragm portion and the edge portion can be separated
without using an adhesive. Stick firmly. The injection conditions and vulcanization conditions of
the rubber may vary depending on the type of rubber, the thickness of the intended edge portion,
etc., but is preferably in the range of 60 to 190 ° C., more preferably 120 to 180 ° C. . If the
temperature is less than 60 ° C., vulcanization may be insufficient, and as a result, the
diaphragm portion and the edge portion may not be integrated well. When the temperature
exceeds 190 ° C., the diaphragm portion may be deformed. For example, a 100 × 62 × 0.3
(mm) flat diaphragm portion is formed using a polyphenylene ether alloy, and a width of 10 mm,
a thickness of 0.5 mm, and a width of 5 mm overlapping the diaphragm portion are formed using
SBR. When forming an edge portion having a thickness of 0.2 mm, a preferable mold
temperature is about 180.degree. In addition, a foaming agent can be added to rubber, and
rubber can be foamed in a metal mold after injection.
[0032]
Thus, a speaker member in which the diaphragm portion and the edge portion are integrated is
obtained. In the case of arranging the arrow plastic, after the diaphragm portion and the arrow
plastic are injection-molded into a predetermined mold, the rubber may be injection-molded and
vulcanized.
[0033]
Hereinafter, the operation of the present invention will be described. According to the present
invention, a speaker in which the diaphragm portion and the edge portion are firmly fixed by a
chemical bond by using a specific polyphenylene ether-based alloy or polyamide for the
diaphragm portion and using a specific rubber for the edge portion Members are obtained. The
mechanism for forming such a chemical bond is considered as follows: (1) The polyphenylene
ether in the alloy is compatible with the rubber molecule due to its molecular structure. As a
result, when the diffusion speed of the unvulcanized rubber is high, the unvulcanized rubber
molecules are easily diffused into the entangled structure of polyphenylene ether molecules. A
chemical bond is formed between the polyphenylene ether molecule and the rubber molecule by
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diffusion of the unvulcanized rubber molecule and vulcanization being performed at a stage
where the unvulcanized rubber molecule is sufficiently entangled with the polyphenylene ether
molecule. (2) On the other hand, when the diffusion speed of the unvulcanized rubber molecule is
slow, the radical is generated from the rubber molecule by using the peroxide type vulcanizing
agent. Because polyphenylene ether is reactive towards radicals, a chemical bond is formed
between the polyphenylene ether molecule and the rubber molecule. (3) The polyamide forms a
chemical bond with the rubber molecule by the radical by the same mechanism as in (2). The
chemical bond thus formed is schematically shown in FIG. According to such a chemical bond, it
is thought that a diffusion region in which a resin molecule and a rubber molecule are bonded
exists at the boundary between the resin region (for example, the diaphragm portion) and the
rubber region (for example, the edge portion). Be Such a diffusion region is considered to be on
the order of several tens of nm.
[0034]
According to such a speaker member of the present invention, the diaphragm portion and the
edge portion (and the arrow plastic portion if necessary) are not only physically attached but also
chemically bonded at the molecular level. The adhesive strength is significantly increased as
compared with the case of bonding with an adhesive. As a result, a speaker member having
extremely excellent durability can be obtained. Furthermore, since the speaker member of the
present invention is manufactured without using an adhesive, the problem of volatilization of the
solvent from the adhesive does not occur, which is very preferable also from the viewpoint of
environmental problems. In addition, since the number of manufacturing steps (all steps related
to adhesion) is reduced, significant improvement in production efficiency and cost reduction are
possible.
[0035]
Furthermore, according to another aspect of the present invention, there is provided a speaker
member in which the frame portion and the attachment portion are fixed by chemical bonding.
Also in such a speaker member, the bonding strength between the frame portion and the
mounting portion is remarkably excellent as compared with the case of fixing by an adhesive or a
mechanical fixing means (for example, a screw). Furthermore, as described above, a diffusion
area of about several tens of nm (ie, an area having an intermediate property between resin and
rubber) is present at the boundary between the frame part (resin part) and the attachment part
(rubber part) Therefore, the characteristic change between the frame portion and the mounting
portion is smooth, and the reflection between the edge and the frame is suppressed. As a result, if
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the speaker member of the present invention is used, a speaker having very excellent sound
quality can be obtained.
[0036]
According to the present invention, by bonding specific parts together by chemical bonding, it is
possible to provide a speaker member in which parts are firmly fixed without using any
appliance or adhesive. . Since such chemical bonds are formed at the molecular level, the
adhesion strength between parts is significantly increased as compared with the use of an
instrument or an adhesive.
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