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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for various acoustic devices. Prior Art Generally, natural pulp,
aluminum-titanium, beryllium-boron and other metal materials, polymer materials and the like
have been mainly used as the material of the speaker diaphragm. Problems to be Solved by the
Invention The material of 100% natural pulp is weak and low in high 2 · \ −7 limit regeneration
frequency band, metal material is high in material cost and can not be deep drawn and polymer
material is There was a problem that heat resistance and adhesion were inferior. Means for
Solving the Problems In order to solve the above-mentioned problems, the present invention
mixes mica powder which has been subjected to a silane coupling treatment to a natural tangle
pulp, adds a polyamide epichlorohydrin resin and a polyacrylamide resin, and produces a
synergistic effect. It is intended to strengthen the paper strength, to make it by papermaking,
forming and processing. By the above constitution, by mixing mica powder which has been
subjected to silane coupling treatment to natural pulp, most mica powder enters between fibers
of natural pulp to improve rigidity. It is still possible to add polyamide epichlorohydrin resin and
polyacrylamide resin, and the synergetic effect can strengthen the strength of the pulp and the
bonding strength with the pulp. Third Embodiment A speaker diaphragm according to an
embodiment of the present invention will be described below. Disassemble natural pulp; A) I beat
it with a bowl with IJ-Glar method. After subjecting this to a silane coupling treatment with a
center particle diameter of 10071, squid powder is added at 20% by weight 'ratio. After the
pigment is added and colored, 2% by weight of polyamide epichlorohydrin resin and
polyacrylamide resin are added to strengthen the paper strength. After adding aluminum sulfate
to adjust pH to about 4.5 and fixing, a synthetic polymer sizing agent is added to about 1% to
improve water resistance and moisture resistance strength. This is followed by dewatering and
papermaking, followed by pressing to obtain a speaker diaphragm as shown in FIG. In FIG. 1, 1 is
a cone and 2 is an edge. The physical properties of the added mica powder and paper
strengthening agent are shown. Next, comparison of physical property values of the speaker
diaphragm of the present invention and the conventional speaker diaphragm will be shown. In
the conventional product, the valve NBKP 100% is disintegrated, it is refined to 200 SR, and a
rosin sizing agent is added by about 1% by weight ratio, and after fixing pH to about 4.5 with
aluminum sulfate, 5 nos. The speaker diaphragm is formed by processing.
The product of the present invention is equal to or less than the conventional product in Young's
modulus, elastic modulus, bending rigidity and the like. The sound pressure frequency
characteristic of the speaker using the speaker diaphragm of the present invention is shown by a
broken line in FIG. 2, and it is flatter and has a higher sound pressure frequency characteristic
than the conventional product of the solid line. Effects of the Invention As described above, since
the speaker diaphragm of the present invention is configured, a diaphragm having high physical
property values required for the speaker diaphragm can be easily manufactured using
conventional equipment. , Is a great industrial value that can provide higher flat sound pressure
frequency characteristics of high frequency band.
Brief description of the drawings
FIG. 1 is a cross-sectional view showing an embodiment of the speaker diaphragm of the present
invention, and FIG. 2 is a sound pressure frequency characteristic diagram of the speaker using
the conventional speaker diaphragm and the speaker diaphragm of the present invention. .
1 ・ Cone part, 2-・ Edge part.
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