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JPH10257587

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DESCRIPTION JPH10257587
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker diaphragm, and more particularly to a loudspeaker FRP (fiber reinforced plastic)
diaphragm having an excellent appearance.
[0002]
2. Description of the Related Art A conventional FRP diaphragm for a speaker is formed by
applying or dipping resin onto a woven fabric of fibers and pressing it with a high-temperature
mold. For example, Japanese Patent Application Laid-Open No. 6-253389 proposes an example
of such an FRP diaphragm.
[0003]
In the case of coloring the above-mentioned conventional FRP diaphragm for a speaker to a
desired color, there is a method of coloring a woven fabric or a fiber to be a woven fabric, but
according to this method, it is colorless and transparent. The resin may be coated with the resin,
but if the resin has some color, it can not be beautifully colored.
[0004]
Further, in the method of coloring the resin, the coloring agent or the like lowers the strength of
the resin, the elastic modulus, which is one of the basic performances of the diaphragm, is
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deteriorated, and the internal loss is increased.
[0005]
Furthermore, there is also a method of coloring the surface of the finished diaphragm, but in this
case there is a disadvantage that the texture of the fiber becomes invisible or hard to see and the
commercial value decreases.
[0006]
The present invention has been made in view of the above-described point, and an object thereof
is to provide an FRP diaphragm for a speaker having an excellent appearance without impairing
the basic performance of the diaphragm.
[0007]
SUMMARY OF THE INVENTION The speaker diaphragm of the present invention is formed by
adhering a resin in which pearl pigments are mixed to a substrate in which fibers are clothed,
and then heat molding the same.
The above-mentioned pearl pigment is obtained by coating mica with titanium oxide or iron
oxide, or with both titanium oxide and iron oxide.
[0008]
Further, in the speaker diaphragm, a substrate in which fibers are clothed is colored.
[0009]
In each of the speaker diaphragms, the amount of the resin is 35 to 60 percent of that of the
cloth-like substrate, and 5 to 20 percent of the resin is a pearl pigment.
[0010]
In each of the speaker diaphragms, the fiber contains glass fiber.
[0011]
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In each of the speaker diaphragms, the fiber includes polyparaphenylene benzobisoxazole (PBO)
fiber.
[0012]
In each of the speaker diaphragms, the fibers include Kepler fibers.
[0013]
Furthermore, in each of the speaker diaphragms, the fibers include carbon fibers.
[0014]
DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker diaphragm which is an
embodiment of the present invention will be described based on the drawings.
In FIG. 1, 1 is a substrate made of a woven fabric of plain weave of polyparaphenylene
benzobisoxazole (PBO) fibers and is colored black.
2 is a resin coat made of a vinyl ester resin in which a pearl pigment is mixed with 15% of the
resin component.
The resin coat 2 is dipped on the substrate 1 and molded into a diaphragm shape by a mold
heated to 140.degree.
[0015]
In the above embodiment, the substrate 1 is a woven fabric, but a fibrillated fiber or the like may
be used to form a non-woven fabric, which may be used as a substrate to form an FRP
diaphragm.
The color of the substrate is not limited to black, and may be colored in any color.
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[0016]
In addition, the amount of the resin is 35 to 60 percent of the substrate, and 5 to 20 percent of
the resin is a pearl pigment so as to provide a speaker diaphragm achieving the initial purpose by
the component amount. it can.
Also, the fibers constituting the substrate may contain glass fibers, Kepler fibers or carbon fibers.
[0017]
According to the present invention, it is possible to maintain the elastic modulus by the titanium
oxide or iron oxide of the pearl pigment, and to mold while maintaining the internal loss by the
mica, and at the same time to impart pearly luster, Since the weave of the above can be further
emphasized, it is possible to provide a speaker FRP diaphragm having an excellent appearance
without impairing the basic performance of the diaphragm.
[0018]
In addition, when the woven fabric is colored black, the pearl color may be covered with burrs,
and at the same time, degradation or discoloration due to ultraviolet light can be prevented when
the molecular structure is such that oxygen or nitrogen is contained in the benzene ring such as
PBO. .
[0019]
Further, in the case where the fiber is carbon fiber, it is not necessary to color the fiber because
the carbon fiber itself is black.
[0020]
Brief description of the drawings
[0021]
1 is a cross-sectional view showing a speaker diaphragm according to an embodiment of the
present invention.
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[0022]
Explanation of sign
[0023]
1 Substrate 2 Resin coat
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