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JPS5396822

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DESCRIPTION JPS5396822
Specification 1, Name of the Invention Method of manufacturing a diaphragm for a speaker, in
the case of manufacturing a diaphragm containing carbon fiber, polyvinyl alcohol; r-le fiber is
mixed and made into paper, and then the polyvinyl alcohol fiber is melted at the time of heat
forming And bonding the remaining fibers together.
2, the scope of claims
6. Detailed Description of the Invention The present invention relates to a method of
manufacturing a speaker diaphragm including carbon fiber. In general, in the speaker diaphragm,
it is necessary to increase the diaphragm value, that is, the speed of sound, in order to completely
improve the response characteristics in the high frequency range of lOK 7 to 20. Many attempts
have been made, but still satisfactory results have not been obtained. This is because the
inclusion of high elastic fibers tends to be bulky, and therefore the reduction of the bonding
points between fibers and the reduction of the entanglement effect is significant, and it is
possible to use as a diaphragm despite the use of high Young's modulus fibers. E drops, after all
it is the diaphragm of the diaphragm! In order to bind the fibers to be formed and to increase the
Eli of the diaphragm, papermaking is carried out by mixing a polyvinyl alcohol powder, a sizing
agent such as carboxymethyl cellulose, or a powder or fiber of synthetic resin. The thing is done.
However, when the former sizing agent is used, such a sizing agent is used as a water bath
solution, and it is not effective unless it is added in large amounts, which is not preferable. In the
case of using the latter synthetic resin entirely, it is necessary to go through complicated
processing such as immersing the diaphragm substrate in an organic solvent to dissolve the
synthetic resin after paper making. Alternatively, there is also a method of applying a synthetic
resin paint to the surface of the diaphragm substrate after paper making to bond the fibers, but
even with this method, it is difficult to obtain a uniform coated film, and the object of the present
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invention is to When manufacturing the diaphragm, including the degree of bonding between the
fibers that assemble the diaphragm, it is simple and EndPage: 1 effectively increases the elasticity
of the diaphragm as shown in Figure 9, making the features of carbon fiber highly elastic enough
It is something to be alive. According to the method of the present invention, the starting fiber
material containing carbon fiber is mixed with polyvinyl alcohol fiber as a binder, in particular,
and paper-made, heat-formed it into a diaphragm shape, and the polyvinyl alcohol fiber is melted
at the time of molding. Bonding other fibers remaining by the melt together into t-S
characteristics. In the present invention, the polyvinyl alcohol fiber is insoluble in water, and it is
extremely soluble in 60 to 800 or more warm water, which brings about extremely excellent
effects. That is, usually, the papermaking material is an aqueous solution, dewatered after
papermaking, and the dangerous diaphragm substrate is then heated and pressed at a
temperature of about 1000 for dehydration drying and molding, according to the method of the
present invention The polyvinyl alcohol fiber is melted inside the diaphragm substrate by the hot
water just before drying at the time of such heating and pressure molding, and the melt bonds
the remaining fibers such as carbon fiber homogeneously and firmly. . In addition to carbon
fibers, natural fibers, chemical fibers, etc. may be used in combination as needed, and the
polyvinyl alcohol 1 m [O mixed amount is preferably in the range of 596 to 60% of the total fiber
weight including polyvinyl alcohol fibers.
If the mixing amount is 5% or less, the binding effect is small and the vibration sells completely.
As shown in FIG. 1, the fiber material of polyvinyl alcohol 9 diaphragm according to the present
invention comprises carbon fiber and kraft pulp, and the weight ratio of the two is 70% in the
former and 50 in the latter.
2, the scope of claims
Hereinafter, the present invention will be described in detail. Young's modulus cut into 15000
carbon fiber 1 reconnaissance? 70 parts, kraft pulp Th 50 parts are prepared, and polyvinyl
alcohol fiber t-5 is cut and blended with tls part to be a starting fiber material, which is used for
paper making and dewatering by a usual method. This was heat-pressure molded at a
temperature of 180 ° C. to obtain a cone 811110, the frequency response characteristic of
which was as shown in FIG. 2A. Also, for comparison, carpoly as a binder instead of polyvinyl
alcohol fiber in the above example, and the frequency response characteristic is as shown in FIG.
2B. As apparent from FIG. 2, the improvement effect in the embodiment of the present invention
is remarkable. As apparent from the description above, according to the present invention, in the
production of a diaphragm containing carbon fibers, the degree of adhesion between the fibers
constituting the diaphragm can be simplified simply by adding polyvinyl alcohol fiber to one
starting fiber material. The characteristics of the carbon fiber which can be effectively increased
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and hence the high elasticity is sufficiently exhibited, and it is possible to obtain particularly
excellent vibration characteristics for the high frequency speaker.
4. Brief Description of the Drawings FIG. 1 is a curve diagram for explaining the present
invention, and FIG. 2 is a frequency response characteristic diagram of the embodiment of the
present invention. EndPage: 2
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