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JPS54155825

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DESCRIPTION JPS54155825
l1 Title of the Invention
Speaker diaphragm
3. Detailed description of the invention. It is well known that carbon fibers have excellent
properties on the base of the diaphragm of middle and high range speakers as a high elastic
material. However, since carbon fiber is a brittle material, it was necessary to be careful about
nucleation of fracture. For this reason, the length of the fiber itself is made relatively short, and
this is often made into a sheet or mixed with other fibers, but mixing or stirring, etc., can be
performed sufficiently to improve the dispersion of the fiber during sheet formation. There was a
humble point such as no. The present invention is intended to eliminate the disadvantages of the
above P, and the breaking strain of the carbon fiber is small, so that the characteristic is
improved by mixing with a large fiber of this to make the handling easy and the moldability also
A speaker diaphragm having an acoustically excellent property is also improved by further
improving the bonding property of the speaker diaphragm component by an adhesive and a
fixing agent, and the actual EndPage: 1 phenolic resin, polyimide resin, acrylic resin, Continuous
filaments of carbon fiber obtained by firing rayon etc. in inert gas at 5000 C to 1500 'C are
subjected to sizing treatment with polyvinyl alcohol aqueous solution etc., and this and high
elasticity such as glass fiber and aromatic polyamide fiber A continuous filament of synthetic
fiber is blended and woven to form a base of the speaker diaphragm. Sizing treatment is intended
to improve the bonding and fixing condition between carbon fiber and synthetic fiber, which
improves the efficiency of the manufacturing process and is a tool for improving the quality of
the product. Therefore, it may be omitted in some cases. . The woven fabric to be the woven or
knitted diaphragm base material may be a relatively coarse mesh-like one for a cone speaker, and
a relatively dense cloth-like one for a diaphragm of a dome-shaped speaker. The diaphragm
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substrate may be impregnated with a synthetic resin having a large internal loss and a relatively
high Young's modulus, such as a urethane resin, an acrylic resin, an epoxy resin, a diallyl
phthalate resin, etc., and heat and pressure may be formed. Since the bonding condition between
the yarns is not necessarily sufficient, in order to further increase the Young's modulus, it is
necessary to increase the adhesion-variation of the yarns and integrate them. There, a material
which is well bonded and fixed to the mixed yarn of carbon fiber and synthetic fiber is mixed in
order to serve as a closure of the woven fabric which is a diaphragm substrate. In the case of a
woven fabric consisting of carbon fibers and aromatic polyamide fibers, mica flakes, glass flakes
and other inorganic 1 @ flakes are well suited. For the purpose of yarn binding and cloth or mesh
closure, it is desirable that the size of the inorganic 1-scale-like material be at least longer than
the cloth or mesh and less than twice the size of the mesh.
In the case of a woven fabric consisting of carbon fibers and glass fibers, glass flakes are well
suited, and a mixture of glass flakes and chopped carbon fibers may be used. These inorganic
substances and scale-like substances are made to float and adhere to a cloth or mesh so as to be
made into a woven cloth to be a diaphragm substrate, and become caught. The effect of bonding
and fixing can be enhanced if the solution of this floating liquid is made a solution of synthetic
resin bonding fixing agent, and the synthetic resin is at least a carbon resin, an aromatic
polyamide fiber, a glass fiber, etc. A diallyl phthalate resin, an epoxy resin, etc. which are used for
a base material, and adhesiveness with a high elastic fiber may be used. If it can not withstand
mechanical stress that occurs when using a diaphragm etc., it may be damaged such as a crack,
which may damage its durability, and therefore, it is necessary to have appropriate flexibility. The
synthetic resin of Mae Station can be practically used experimentally, and it is needless to say
that other synthetic m1Ms can be used as long as the conditions are satisfied. As described
above, the inorganic scale-like material is dispersed on the woven fabric of the diaphragm base
material, and impregnated with a synthetic resin, and this is subjected to heat and pressure
molding to obtain a speaker diaphragm. This speaker diaphragm solves the defect that could not
be obtained due to the high Young's modulus due to the poor bonding between carbon fibers,
and the carbon fibers are mutually fitted by the high elasticity fiber and the inorganic scale-like
material. Since the resin is strongly bound by the curing of the synthetic resin, the Young's
modulus is close to the Young's modulus of the carbon adhesion itself. In addition, carbon fiber is
blended with synthetic fiber, so it is difficult to break and handling becomes easy. In order to
prevent partial stress from being applied to the woven fabric by molding, for example, while it is
wound up by a filament winding method to a predetermined diaphragm shape while being
impregnated with an epoxy resin solution, etc. Molding becomes very easy. According to the
present invention, a table can be obtained by maximizing the characteristics of the material itself
as described above that is light and stiff, and the internal loss is also large, and the high
frequency range is also expanded in the frequency response characteristics, and the dip is
reduced. Have a remarkable effect. In addition, since the processability is improved, the
manufacturing is easy and the cost can be reduced. EndPage: 2
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