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FIELD OF THE INVENTION The present invention relates to a speaker diaphragm. [Prior Art]
Conventionally, as the speaker diaphragm of this type, for example, ones disclosed in Japanese
Utility Model Application Publication Nos. 51-98535, 5822621 and 59-47520 are known. In this
conventional structure, the resin is reinforced with a woven fabric of at least one high-elasticity
fiber, for example, carbon fibers, carbon fiber and glass fiber. For example, a fiber bundle of
3,000 fibers of about 13μ carbon fibers and bundled of 3,00Of is used as weft and warp yarns,
and the weft and warp yarns are woven by plain weave, for example, 5 yarns / inch. A cloth is
obtained, and 100% of a general-purpose vinyl ester resin is applied to this woven fabric at a
resin content of 50% to form a prepreg, and pressure heating is performed in a mold to obtain a
prepreg. ing. At this time, a speaker diaphragm may be obtained in which paper is mounted in a
mold and a mold and the paper is adhered to the back surface of the prepreg. Among the woven
fabrics used for the above speaker diaphragm, carbon fibers are generally black, aramid fibers
are yellow, and other fibers are white. Therefore, colorful ones with rich fashion properties are
desired. Heretofore, in the case of dyeing of this kind of filament, a treatment solution in which
commercially available dyes having various dyes called pigment range colors or pigment resin
dyes are dispersed in water at a ratio of about 1: 1 is used. By the way, the above pigment resin
color is substantially composed of 10% by weight of pigment, for example, 90% by weight of
binder having starch, polyvinyl alcohol (emulsion) or the like as a main component, It is dyed
with a processing solution of 5% by weight, 45% by weight of binder and 50% by weight of water,
and in this case, the adhesion amount per 8100 g of ficimen of 13μ, ie, pigment and binder The
amount of adhesion of 259 is necessary, and the breakdown of this adhesion amount is pigment
2, 59, binder 22.59 from the content of the pigment resin color, so 22.5% of binder adheres to
the filament when dyed. It will be. However, this binder has a role as an adhesive for pigment
adhesion, that is, a role to prevent discoloration, and is indispensable for fixing dyeing, but when
this filament is subjected to resin impregnation processing When the amount of binder increases,
the binder lowers the adhesive strength between the filament and the resin, which may lower the
physical properties as a composite material of the fiber and the resin, such as ILSS (interlayer
shear strength) and bending strength. It is inconvenient in the improvement of the acoustic
characteristic as a diaphragm.
Of course, if the amount of pigment resin color to water is reduced to reduce the amount of
binder attached, the desired color can not be obtained. [Means for Solving the Problems] The
present invention is to solve these disadvantages, the gist of the present invention is for a
speaker having a resin reinforced with a woven fabric of at least one high elastic fiber It is a
diaphragm, and the filament of the above-mentioned woven fabric is dyed with a treatment liquid
consisting of 2 to 4% by weight of pigment, 0.1 to 1% by weight of binder, 2 to 4% by weight of
surfactant, and the balance of water. The speaker diaphragm is characterized in that. [Function]
When a filament is dyed using a treatment liquid consisting of 2 to 4% by weight of pigment, 0.1
to 1% by weight of binder, 2 to 4% by weight of surfactant and the balance of water, coloring is
caused by the addition of surfactant. The amount of adhesion to the filament is reduced without
appreciably decreasing the degree of adhesion, and the amount of adhesion of the binder is also
reduced, and the filament may be impregnated with a resin to enhance its acoustic characteristics
when used as a speaker diaphragm. In this case, carbon black is used as the above-mentioned
pigment in the case of black, and other pigments having red, blue, brown and yellow pigments
are selected, and as a binder, polyvinyl alcohol (emulsion), starch and the like are main
components The glue to be used is used. Further, there are anionic, cationic and nonionic
surfactants, which are selected according to the material of the filament, etc. Further, as the
filament, highly elastic fibers such as glass fibers, carbon fibers and aramid fibers, generally
elastic It can be applied to fibers with a rate of 7,000 to 9 / x 1 or more. The filaments are
usually formed into yarns, woven into a woven fabric and then impregnated with, for example,
transparent resin. For example, thermosetting of epoxy resin, unsaturated polyester resin, phenol
resin, polyurethane resin, etc. Resin, thermoplastic resin such as polyamide resin and vinyl
chloride resin are used. As described above, when 2% by weight or less of pigment is 2% or less,
insufficient color may occur, and when it is 4% or more, excessive color may occur, and 0.1 to 1%
by weight of binder is used. When it is less than 0.1%, discoloration occurs, and when it is more
than 1%, the physical properties of the composite material are reduced. In some cases, the
content of 2 to 4% by weight of surfactant is adjusted from the weight% of the above pigment
and binder to an appropriate amount. Here, the dyed state of the filament will be described with
reference to FIGS. 1 to 4. As shown in FIG. 2, when the treatment liquid is applied to the filament
1 by immersion or the like, the deposit 3 containing the pigment 2 adheres to the surface. The
filament 1 is to be dyed, and when the colored filament 1 is impregnated with the resin 4, a
composite material is obtained as shown in FIG.
Here, when the conventional treatment liquid is used, the pigments 2 aggregate each other as
shown in FIG. 4, the particle size becomes large, and accordingly, the amount of the binder 5
becomes large, and this causes the resin as shown in FIG. It is a factor that causes the physical
properties of the impregnated composite material to be lowered, or when the treatment liquid of
the present invention is used, the surfactant 6 suppresses the aggregation of the pigment 2 as
shown in FIG. As a result, it is presumed that the amount of binder 5 may be reduced
accordingly. [Example] Treatment liquid face: carbon black 3% by weight binder: polyvinyl
alcohol (emulsion) ■, 2% by weight surfactant: anionic 3% by weight water 92.8% by weight As a
result of immersing and staining 13 μ glass fiber in the solution, the adhesion amount was
stained black at 2.59 per 100 g of filament. This filament is plain-woven, and as shown in FIG. 5,
4100% of a general-purpose vinyl ester resin is applied to the colored woven fabric 7 at a resin
content of 50% to form a prepreg, and pressure heating is performed in a mold to obtain a
prepreg. It processed and the diaphragm 8 for speakers was obtained. Therefore, compared with
the case where the conventional treatment liquid is used, the adhesion amount is 2.5 g of 25 g
and 1/10, and the breakdown is pigment 19, surfactant 1 g and binder 0 ° 59, binder As
described above, <22.59 was necessary, but it was 0.5 g. Therefore, the physical properties of the
composite material were enhanced, and the acoustic characteristics of the speaker diaphragm 7
were improved. As described above, according to the present invention, the filament can be dyed
to improve the physical properties of the composite material, and the acoustic characteristics of
the speaker diaphragm can be improved. As described above, the intended purpose can be
sufficiently achieved.
Brief description of the drawings
FIG. 1 is a cross-sectional view of the present invention, FIG. 2.3 is a cross-sectional view of a
dyeing method, and FIG. 4 is a cross-sectional view of a conventional method, FIG. The figure is a
front view of the speaker diaphragm.
1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 5 binder. November 28, 1988 Applicant: Arisawa Mfg.
Inventor Asano Yukio Agent Yoshi Akira Akira Sakai 7 h proboss 1 slot 2? 72? Add 7 years!
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