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JPH0494297

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DESCRIPTION JPH0494297
[0001]
<Industrial Field of Application> The present invention relates to a diaphragm used for an
electroacoustic transducer such as a speaker, which uses two types of synthetic resin materials.
<Conventional Art> Conventionally, this type of diaphragm has been completed by molding a
synthetic resin material of a normal property by a conventional method alone or by using a
planer V to complete a diaphragm. <Problems to be Solved by the Invention> Therefore, the
conventional diaphragm of this type has the usual conventional nature I! Therefore, the present
invention has the property of low temperature crystallization which has not been conventionally
used in order to solve such conventional problems. Another object of the present invention is to
provide a diaphragm in which two types of resin fibers are mixed, fused and fused using different
melting points. <Means for Solving the Problems> The constitution of the present invention for
achieving the object will be described with reference to FIG. 1 and FIG. 2 corresponding to the
examples. And a crystalline resin fiber having the following properties, which is mixed and fused
at an intermediate temperature between the above-mentioned melting temperatures. <Operation>
Since the present invention is configured as such, in the process of mixing and fusing two types
of resin # & fiber, one resin fiber does not break its shape and retains the ability as a filler. As a
result, it is possible to retain high values of physical properties such as the Young's modulus of
the product. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred
embodiment of the present invention will be described with reference to the drawings. FIGS. 1
and 2 show an embodiment of the present invention, in which two types of resin fibers, that is, a
fiber of polyethylene terephthalate (P E T) and a fiber of polypropylene (pp) are shown. The
mixed product sheet is mixed with a molding die heated at about 170 ° C., heated and held for
about 10 seconds, and then taken out from the mold. The diaphragm completed in this way has a
structure rI1. The thermal properties of resin fibers PET and PP are as shown in Table 1, and the
melting point of the lower PP is about 167 ° C. or less t! At temperatures shown in Table 41,
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PET undergoes low temperature crystallization and crystals are formed. Although the Young's
modulus of PET increases, one PP melts because it is above the melting point. In addition, when
the first two types of material fibers are mixed, PETl1 fibers are oriented randomly in the
direction of the fibers, so they function as fillers even after low temperature crystallization, and
they are randomly arranged. The Young's modulus of the product diaphragm is equal in radial
and circumferential directions.
FIG. 1 is a schematic structural view of a diaphragm of the present invention, and FIG. 2 is a
block diagram of a manufacturing process. Although the embodiments considered to be
representative of the present invention have been described above, the present invention is not
necessarily limited to only the structure of these embodiments, and includes the constituent
requirements of the present invention and the object of the present invention. It can be suitably
modified and implemented within the scope of achieving the effects described below. <Effects of
the Invention> As already apparent from the above description, according to the present
invention, in the process of mixing and fusing two types of resin fibers constituting the
diaphragm of the present invention, one resin fiber does not lose its shape, It is possible to
maintain the ability as a filler and to retain high values of physical properties such as the Young's
modulus of the product. The diaphragms completed in this manner have thermal properties of
PET and PP of the constituent resin fibers as shown in Table # S1, and the lower PP melt, at a
temperature of α about 167 ° C. or higher, PET In this case, low temperature crystallization
occurs and crystals are formed. Then, although the Young's modulus of PET increases, one PP
melts and becomes molten and melts. In addition, when the first two types of material fibers are
mixed, PETl1 fibers are oriented randomly in the direction of the fibers, so they function as fillers
even after low temperature crystallization, and they are randomly arranged. The Young's
modulus of the diaphragm of the present invention is equal to the radial direction and the
circumferential direction, and the value thereof is 8 X 10 'dyne of the diaphragm of the present
invention as shown in Table 2 below. / I came to be able to expect the Ill effect of becoming more
cva2 and increasing steadily.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a schematic structural view of a diaphragm of the present invention, and FIG. 2 is a
block diagram showing a manufacturing process.
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