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PROBLEM TO BE SOLVED: To use a material (material for cone edge) used for an edge portion 1
serving to attach a cone portion 2 for amplifying a sound by resonance to a casing 3 of a speaker
in a speaker (a material for cone edge) It is an object of the present invention to provide the
above-mentioned material capable of preventing the occurrence of a dent in the edge portion
which may impair the sound quality of the above, and maintaining the good shape immediately
after production for a long period of time. . SOLUTION: A rubber layer is formed on a base
material made of polyester crimped yarn. The rubber layer may be formed via an unvulcanized
adhesive layer. [Selected figure] Figure 1
Corn edge material
The present invention relates to a material (a material for a cone edge) used for an edge portion
of a speaker cone, and in particular, to maintain a good shape immediately after production for a
long period of time without impairing the sound quality. Related to the above-mentioned
The edge portion of the speaker is indicated by reference numeral 1 in FIG. 1A and serves to
attach the cone portion 2 for amplifying the sound to the casing 3 of the speaker, and as a
material constituting this edge portion 1, Conventionally, in order to provide shape retention,
those obtained by impregnating a cotton cloth with a phenol resin are widely used.
The phenolic resin-impregnated cotton fabric is formed into an edge shape by press molding.
By the way, although the phenol resin makes mold release defective during the above-mentioned
press molding and stains the mold, sufficient shape retention can not be secured unless the
phenol resin is used. Moreover, the above-mentioned phenolic resin-impregnated cotton cloth is
used for the above-mentioned edge portion, and when it resonates with the vibration of the cone
portion to repeat the vibration, the dents 11 (commonly referred to as "EVBO") as shown in FIG.
In order to suppress this depression 11, it is conceivable to give a certain degree of flexibility to
the edge portion 1. However, in a phenol resin-impregnated cotton fabric, the hardness of the
material for the edge is adjusted to the concentration of the phenol resin. In order to adjust and
secure, it is extremely difficult to have both the hardness necessary for the material for the edge
and the flexibility for suppressing the above-mentioned depression.
A rubberized cloth is also known as a material for an edge provided with a certain degree of
flexibility for the depression 11 suppression and a certain degree of hardness required for the
edge portion 1.
However, in addition to the use of a rubber-based adhesive to secure the adhesion between the
rubber layer and the fabric when forming the rubber layer on the fabric, the rubberized fabric is
said to be bonded after the rubber layer is formed. It is necessary to vulcanize including the
agent layer, and this vulcanization tends to make the texture of the whole material hard. The
hardness of the texture not only reduces the commercial value of the material for the edge, but
also may slightly change the sound quality at the edge portion 1 or reduce the above-described
depression 11 suppressing effect.
Moreover, it is most preferable that the edge part 1 does not resonate with the cone part 2. That
is, when the edge portion 1 resonates, the sound at the cone portion 2 is changed. Therefore, in
order to use the sound of the cone portion 2 as it is, it is ideal that the edge portion 1 does not
resonate. In order to stop the resonance of the edge portion 1, the edge portion 1 may be made
of a soft material. However, if the material is too soft, it is impossible to obtain the shaperetaining property necessary for the edge portion 1. In order to secure the shape retention
property, when using a rubberized cloth as a conventional edge material, it is necessary to
vulcanize the rubber layer and the rubber-based adhesive layer, and it is necessary to use a hard
material for the edge. I couldn't help it.
In the present invention, in consideration of the above-mentioned points, the resonance with the
cone portion 2 is reduced as much as possible, and the occurrence of the recess 11 does not
occur even if the resonance is repeated, and the texture is hardened by reducing the vulcanized
portion. It is an object of the present invention to provide a material for a cone edge which can
reduce the size and complete the manufacture of the edge in a simple process.
In order to achieve the above object, the present invention uses a crimped yarn made of
polyester in place of the above-mentioned cotton cloth, and using the crimped yarn as a base
material and forming a rubber layer thereon The material of corn edge to be characterized is a
That is, in the present invention, the following functions and effects can be obtained by replacing
the conventional cotton cloth with the fibrous material constituting the base material with a cloth
made of a crimped yarn made of polyester.
(1) Due to the inherent thermoplastic properties of polyester, which is a raw material of crimped
yarn, without using a phenol resin, the same properties as the edge material using a conventional
phenol resin (ease of processing, moisture resistance , Shape retention, etc.).
(2) By the crimped yarn, the base material itself can maintain good stretchability, and generation
of dents can be favorably suppressed even when resonating with the cone portion and repeating
vibration. (3) By using the above-mentioned base material made of the crimped yarn made of
thermoplastic polyester, the adhesive layer can be made into an unvulcanized rubber-based
adhesive, so that the hardness of texture is reduced, and By reducing the resonance at the edge,
the speaker can cope with higher sound pressure.
According to the present invention, the following effects can be achieved. (1) It is easy to process,
and it is possible to obtain a material for cone edge having characteristics such as moisture
resistance and expansion and contraction. (2) Not only can the resonance state of the cone
portion be maintained as it is, but the occurrence of dents can be favorably suppressed even if
the vibration is repeated by resonating with the cone portion. (3) The adhesive layer between the
substrate and the rubber layer does not require rubber elasticity, so there is no need to vulcanize
the adhesive layer, and the texture of the edge material does not become hard. (4) When using a
rubber-based adhesive, it becomes a rubber-based adhesive layer in an unvulcanized state, and
since the unvulcanized rubber-based adhesive has good adhesiveness, the material for the edge is
used. It can be easily glued to the cone and other speaker structures, making it easy to attach the
edge. (5) The hardness of the texture can be reduced, the resonance at the edge can be reduced,
and the change in sound can be eliminated as much as possible.
In the polyester crimped yarn according to the present invention, for example, polyester fibers
are temporarily twisted, crimped by heat treatment or acid treatment, etc. and twisted to make
yarn, or polyester fibers are twisted. After being warped, it can be compacted, crimped by steam
or the like and crimped, or those obtained by various other production methods can be used.
Such polyester crimped yarn is easy to process and is excellent in moisture resistance because
polyester is a thermoplastic resin. In the present invention, since the crimped yarn made of
polyester having such properties is used, it is possible to provide an edge material having
excellent durability and having a long life that works well over a long period of time.
The crimpability (stretchability) in the present invention can be in a stretched state (stretched
state) by applying a tensile force to the yarn in a state (steady state) in which no force is applied.
It is possible to recover the original steady state by removing the pulling force from the yarn, and
by adding and removing the pulling force, it is said that the steady state and the stretched state
can be repeated. As the degree), those having an elongation rate of 2 to 15% and an elongation
recovery rate of about 60 to 100% according to JIS L 1096 A method in a base material made of
the crimped yarn are suitable.
If the crimped yarn is such that the degree of crimp of the base material is the above degree, the
stretchability required for the material for the edge (stretchability that can extend and contract
following this resonance without changing the resonance state of the cone portion) ) Can be held.
The base material in the present invention is a woven fabric, a non-woven fabric, a knitted fabric
or the like prepared by the above-described polyester crimped yarn, and the method of weaving
and knitting such a fabric is not particularly limited. It should just be created to have sex.
In addition, if the thickness of the polyester cocoon filament forming the base material having the
above-mentioned stretchability is too large, the thickness of the base material of the material for
edge becomes too large and the use is limited (the diameter of the speaker is large, Therefore,
there is a problem that the edge part can be used only for large-sized ones, etc.). If it is too thin, if
it is made thinner without reducing the mechanical strength or reducing the mechanical strength,
high cost yarn and In the present invention, it is preferable to use a crimped yarn having a
thickness of about 20 to about 1000 denier, preferably about 50 to about 150 denier.
With such a thickness, the thickness of the stretchable base material can be set to about 0.1 to
0.5 mm, and appropriate for speakers of various diameters and edge portions corresponding to
required quality. Stretchability can be imparted.
The rubber layer formed on the above-mentioned base material is formed using the same rubber
as the rubber used in a rubberized cloth as a conventional material for edge.
Specifically, butyl rubber (BR), nitrile rubber (NR), urethane rubber (UR), isoprene rubber (IR),
chloroprene rubber (CR), chlorosulfonated rubber (CSM), ethylene propylene rubber (EPDM),
styrene Rubber such as rubber (SBR) is used.
Various additives such as softeners, fillers, processing aids, lubricants and the like may be added
to the above rubber, and in some cases, foaming agents such as microcapsules may be added. .
When a foaming agent such as microcapsules is added, the rubber layer can be made foamable
by heat foaming (expansion) in a vulcanization step described later.
The foamed rubber layer reduces the weight of the edge material of the present invention, not
only makes the sound quality of the speaker using this edge material good, but the handleability
of the edge material and, in turn, the edge material Improve the handleability of the speaker
equipped with the edge.
Examples of microcapsules that can be used in the present invention include microcapsules in
which a volatile drug such as hydrocarbon is enclosed in a shell of synthetic resin such as
acrylonitrile copolymer or vinylidene chloride copolymer. .
In the case of a combination of these synthetic resin shells and a volatile drug, the shell is well
pliable in the curing step described later, and the volatile drug is easily volatilized, and the vapor
pressure of the volatilizing agent is flexible. The shell which has been expanded can be solidified,
and the expanded shell can be solidified as it is in an expanded form in a cooling step or an active
cooling step after the vulcanization step, and the rubber layer can be in a foamed state.
The blending ratio of the microcapsules is not particularly limited, and an appropriate one is
selected according to the desired degree of foaming of the rubber layer, but if it is too large, the
adhesion strength of the microcapsules decreases and it is used as an edge portion There is a
concern that it peels off, and if it is too small, the technical significance of blending the
microcapsules does not appear. Therefore, in the present invention, about 0.1 to 0.5% by weight
of the total amount of the rubber composition forming the rubber layer is suitable.
For forming the rubber layer, for example, a forming method such as a topping method, a coating
method, and the like, as in the case of the conventional rubberized cloth is employed. In the case
of the topping method, for example, a rubber-based adhesive layer is formed on a base material,
and a rubber layer is formed thereon by the above rubber composition, and a dusting layer by
starching powder such as starch powder as an antiblocking agent. Form. In the case of the
coating method, for example, a rubber-based adhesive layer is formed on a base material, a
rubber middle layer made of the above rubber composition is formed thereon, and a rubber top
layer made of the above rubber composition is further formed thereon. Form.
The rubber-based adhesive layer in the topping method and the coating method may be any
conventional rubber-based adhesive used in a conventional rubberized fabric or the like, but has
a composition which is not vulcanized in the later-described vulcanization step. It is preferred to
The thickness of each layer in the topping method and the coating method is not particularly
limited and may be appropriately determined in accordance with the diameter of the speaker to
be used, for example, a speaker (about 5 to 18 cm in diameter) used for passenger cars In the
above, the following thickness can be used as a guide.
In the topping method, the rubber adhesive layer is about 0.02 to 0.1 mm, the rubber layer is
about 0.08 to 0.2 mm, and the amount of dusting is about 10 to 100 g / m <2>. A rubber
adhesive layer of about 0.02 to 0.08 mm, an intermediate rubber layer of about 0.02 to 0.08 mm,
and a top rubber layer of about 0.02 to 0.08 mm are suitable.
In either the topping method or the coating method, after all layers are formed, vulcanization of
the rubber layer (in the case of the coating method, both the rubber intermediate layer and the
rubber top layer are referred to) is performed. The conditions for vulcanization at this time may
be the same as in the case of conventional rubberized fabrics, but in the present invention, as
described above, those having crimpability by a crimped yarn made of thermoplastic polyester
are used as a substrate Therefore, only the rubber layer may be vulcanized or may be
unvulcanized. If the rubber layer is left unvulcanized, adhesion of the edge portion of the material
of the present invention to cone paper of the speaker (material is polypropylene, paper, fiber
composite material, etc.) or the support member of the speaker (speaker edge It is not necessary
to use an adhesive separately when bonding to the outer side and a member that supports the
speaker, and bonding can be performed by applying heat. As described above, by thermally
bonding the edge portion and the cone paper, since they can be fixed without the use of a hard
adhesive layer, the function of the speaker can be extracted more favorably.
The rubber adhesive may or may not be vulcanized, and preferably, is not vulcanized using a
rubber adhesive containing no vulcanizing agent. Alternatively, the rubber adhesive may be
partially applied on the substrate by dot coating or the like, and the rubber layer and the
substrate layer may be partially adhered. In this case, the rubber adhesive containing a
vulcanizing agent is used. Agent may be used to simultaneously vulcanize the rubber layer, or
may not be vulcanized using a rubber-based adhesive that does not contain a vulcanizing agent.
Absent. The conditions for vulcanization are preferably a temperature of 130 to 160 ° C. and a
time of about 10 to 20 hours.
1 After vulcanization as described above, it may be cut into a desired edge shape and attached to
the edge of the speaker.
Examples 1 to 10, Comparative Examples 1 and 2 A polyester crimped yarn having a thickness of
75, 100, and 150 denier, and a plain weave fabric using a spun yarn composed of a cotton fiber
having a thickness of 75 denier (ITOCHA Co., Ltd. Trade name “# 111” is used as a base
material, and these four kinds of base materials have a thickness of 0.1 to 0.2 mm via a rubber
adhesive (co-glue in which butyl rubber is dissolved in a solvent) layer. A rubber layer composed
of the following rubber composition was formed, and 0.1 g / m <2> was punched to form a sheet.
As a method of forming the adhesive layer, the entire surface of the substrate is coated with an
adhesive, and the surface of the substrate is coated with a gravure roll in the form of dots (the
adhesive is applied to about 30% of the surface area) Two types of dot coats for applying an
adhesive were used.
[Rubber composition] Butyl rubber 100 parts by weight Microcapsules 0.3 parts by weight (trade
name “Microsphere” manufactured by Matsumoto Yushi Co., Ltd.)
The sheet obtained as described above is used as an edge material to constitute an edge portion
of a speaker mounted on a passenger car, and a load is applied to the edge portion while moving
a passenger car and playing CD music from the speaker Was simulated as follows.
As shown in FIG. 2, 20 ° C. × 1 H standing → temperature increase to 60 ° C. 2H → 60 ° C.
× 6 H standing → temperature decrease to 40 ° C. → 40 ° C × 4 H standing → 2 H −20 °
The temperature was lowered to C → 20 ° C. × 6 H, and the temperature was raised to 20 ° C.
by 1 H as one cycle, and repeated five cycles.
After the above cycle, the music of the CD was played for one hour, and it was observed whether
or not a dent occurred.
The results are shown in Tables 1 to 3.
The symbols in Table 1 have the following meanings. :: no dents occurred and kept in a good
condition ×: dents occurred and not only the appearance deteriorated but also the sound quality
As is clear from Tables 1 to 3, according to the material for edge of the present invention, that is,
the material comprising crimped yarn made of polyester, yarn made of cotton and crimped
(Comparative Example 1) or polyester However, compared to the case of using a material made
of yarn not subjected to crimp processing (comparative example 2), there is no occurrence of
dents, and a corn which is excellent in sound quality as well as appearance over a long period of
time Edges can be provided.
It is a figure for demonstrating the positional relationship of the speaker which should attach the
material for cone edge of this invention, (A) is sectional drawing of the whole, (B) is dented in the
edge part comprised with the conventional material for cone edge It is a figure for demonstrating
the condition in the case of generate | occur | producing.
It is a figure explaining the duty cycle for the simulation performed by the Example and
comparative example of this invention.
Explanation of sign
1 edge 2 cone 3 casing
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