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JPH01290399

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DESCRIPTION JPH01290399
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
support that is integrally provided around a speaker diaphragm and supports the speaker
diaphragm on a speaker casing or the like. [Prior Art] A speaker (a support of a sliding plate is
also referred to as a speaker edge, and is integrally provided around a speaker diaphragm. This
support should have a moderate internal loss. ■ Be lightweight. ■ There is no breathability. ■
There is little change over time. However, heat resistance, moisture resistance, weather
resistance, and water resistance are also required in car-mounted speakers used in car stereos
and the like. From this point of view, conventionally, as a support of a speaker diaphragm, a
woven fabric of cotton, silk, polyester or the like is uniformly coated or impregnated with a
thermosetting resin such as phenol or melamine as a molding material In addition, as a sealing
material, one obtained by uniformly applying a rubber-based resin such as NBR or SBR is used.
There is also known a support molded of a material such as urethane foam without using a
woven fabric. [Problems to be Solved by the Invention] However, although a conventional woven
fabric-based support uses a plugging material, a weave remains on the surface of the support,
and this woven fabric Since water droplets adhere to the eyes, the water repellency is poor, and
there are problems with water resistance and moisture resistance. In addition, the directionality
by the effect of the weave is strong, the characteristics are not uniform around the diaphragm,
and there is also a defect that the molded support is deformed into a wave shape due to the
difference in shrinkage factor after molding. Roughly, the strength of the support itself depends
on the strength of the waist of the woven fabric which is the base material and the river of the
thermosetting resin impregnated with this, but in order to obtain excellent acoustic properties,
the proper balance between the two is sufficient. It was necessary and extremely difficult to
design. On the other hand, supports made of molded urethane foam have a size of about 0.5 to 1
mm or more for individual foams, and in order to maintain airtightness, the thickness is at least 3
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times the diameter of the foam. Since it is necessary, it causes an increase in the weight of the
imaging system, and there is a drawback that the sensitivity of the speaker decreases. In
particular, urethane alone has low strength, has problems with weatherability, and can not be
used in places where use conditions are severe as in automotive applications. In addition, there is
a problem that the molding time is prolonged because it is necessary to compress the foam into a
sheet shape at the time of molding. The present invention solves the problems of the prior art as
described above, and is excellent in directivity, acoustic characteristics, water resistance, weather
resistance, and moreover, the support of the speaker diaphragm requiring a short manufacturing
time and the original used therefor The purpose is to provide cloth.
[Means for Solving the Problems] The support of the diaphragm of the speaker of the present
invention uses a raw fabric in which an unvulcanized foamed layer of synthetic resin is formed
on a base material made of woven or non-woven fabric. It is characterized in that the cloth is
cured by heating and pressing. Moreover, the base cloth for the support body of the speaker
diaphragm of the present invention was obtained by impregnating a thermosetting resin on a
base made of a woven fabric or a non-woven fabric, and forming an unvulcanized foamed layer of
synthetic resin on this base It is characterized by [Operation] In the support of the speaker
diaphragm of the present invention having the above-mentioned configuration, the unvulcanized
foamed layer of synthetic resin is formed on the base material made of woven fabric or nonwoven fabric. The base material surface is covered with the vulcanized foam layer, and the weave
of the base material is effectively blocked as compared with the case where a rubber-based resin
sealing material is applied, and the surface becomes smoother. As a result, the water repellency is
significantly improved, and excellent water resistance and moisture resistance can be obtained.
In addition, the unvulcanized foamed layer is not simply a foamed resin, and the unvulcanized
foamed layer is heated and pressed to crush the foamed layer and simultaneously vulcanized and
cured to obtain a predetermined shape and elasticity. The directionality of the cloth does not
appear, and deformation after molding, deviation of acoustic characteristics, etc. are eliminated.
In particular, it is possible to satisfy both contradictory performances of improvement in strength
and durability and weight reduction by combining the foamed resin and the base material such
as the woven fabric instead of the woven fabric and foam resin alone. In addition, since the
support can be obtained only by heating and pressing the raw fabric after foaming, the molding
speed of the support is also greatly improved. EXAMPLE First, a cotton cloth having a thickness
of 0.25 mm is dyed black, and impregnated with a phenol resin or a melamine resin at a
temperature of 100'C for 30 seconds to produce a substrate. 100 ffii parts of a self-crosslinking
acrylic emulsion based on a polyacrylic acid Nisdell copolymer, 1 to 3 parts by weight of a
thickener based on sodium polyacrylate, and foam stability based on stearic acid oil Parts by
weight of a curing agent, 5 parts by weight of an aqueous melamine resin, 0.5 parts by weight of
a curing catalyst such as ammonium chloride, and 1.5 parts by weight of 25% ammonia water By
over-roll coating, it was applied on the surface of the base material to a total thickness of 0 ° 35
mm and dried at 120'c for 3 minutes to obtain a base fabric of this example. In this case, the
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stirring speed of the paint is preferably 1000 to 1500 PPM, and the stirring time is preferably 5
to 10 minutes. If the stirring speed is 11000 RP or less, the expansion ratio is low, the flexibility
is lacking, and the desired feeling is not obtained. When the speed is 1500 PPM or more, the
expansion ratio is large and the strength of the coating film is significantly reduced.
In the base fabric of the present example obtained in this manner, the foamed resin intrudes into
the weave, and further, a resin layer is formed on the surface, and has a sublime feeling as a
whole. This original fabric is introduced into a heating press mold and treated in a ring shape,
and at the same time, it is heated and pressed for 6 seconds at a pressure of 180 ° C., 3 kQ / cm
2, and molded into a desired shape to obtain a speaker diaphragm The support of It was
confirmed that the support jqed in this manner had a smooth surface, little exposure to texture,
water repellency, and that no water droplets were attached to the surface. In addition, the
heating and molding time required to obtain the support from the base fabric is significantly
shortened compared to 30 to 60 seconds of the conventional foamed resin alone, and moreover
it may be deformed or less even if it is left after molding confirmed. In addition, as resin which
forms a foaming layer in this invention, not only an acrylic resin but rubber elastomers, such as a
urethane resin and SBR, NBR, can be used. In addition, as a substrate, organic fibers such as
cotton, silk, polyester, etc., inorganic fibers, woven fabrics obtained by blending these, and nonwoven fabrics made of these materials can also be used. [Effects of the Invention] As described
above, according to the present invention, utilization of the composite material of the base
material and the synthetic resin by means of heating and pressing the raw fabric having the foam
layer formed on the base material, and It is possible to perform special processing such as
crushing the heat-pressed resin by heating and pressing, and it is excellent in weather resistance
and water resistance, without deterioration of acoustic characteristics due to deformation and
directionality, and shortening of manufacturing time is also possible. An excellent loudspeaker
diaphragm support and its source F8 can be provided. Applicant Toyo Coating Co., Ltd.
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