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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm of a speaker used for various acoustic devices. Prior Art A conventional diaphragm
edge base material is a cloth impregnated with a resin such as natural pulp or 5BR-NBR as a free
edge to be attached to 100% of natural pulp integrated with a cone, or with a cone. . There was
urethane foam and the like. Problems to be solved by the invention Since the fixed edge is
integrated with the cone, the lowest resonance frequency (fo) is high and heavy low temperature
regeneration is not possible. Among the free edges, natural pulp breaks the edge if it takes too
much amplitude. Therefore, the weight of the cloth and urethane foam is heavy and expensive,
and the free edge is a process of separately forming the cone portion and the edge portion and
then bonding the both with an adhesive. There was a problem that the cost of goods became
extremely high. An object of the present invention is to provide a speaker diaphragm that is low
in cost, high in input resistance, light in weight, and can be simultaneously bonded to a cone
portion. Means for Solving the Problems In order to solve the above-mentioned problems, the
present invention impregnates a papermaking sheet material of a natural pulp based on Manila
hemp with a vinyl acetate-acrylic copolymer resin, and further Chlorosulfonated It is intended to
constitute a speaker diaphragm by simultaneously molding and bonding a processing material
impregnated with a polymer resin and a cone portion. Action Low cost, weight reduction, and
further improvement in load resistance The natural pulp papermaking sheet material based on
Manila hemp is impregnated with a vinyl acetate-acrylic copolymer resin to improve the wet
strength, and is further molded The chlorosulfonated polymer resin is impregnated for
simultaneous bonding. The vinyl acetate-acrylic copolymer and the chlorosulfonated polymer
resin are both thermosetting resins, and when molded at high temperature during molding, they
are adhered to the cone portion to obtain a completed diaphragm. EXAMPLE Hereinafter, a
speaker diaphragm in an example of the present invention will be described. A papermaking
sheet material with a basis weight of 36 gr / rrl, in which 30% by weight ratio of lintan pulp
mixed with manila hemp, is impregnated with 8 grld of a vinyl acetate-acrylic copolymer resin,
dried and then impregnated with 40 gr / d of a chlorosulfonated polymer resin, dried Do. After
this edge base material was punched into a predetermined shape, it was simultaneously molded
with the cone portion under the conditions of a mold temperature of 180 ° C. and a pressing
time of 4 SeC, and a diaphragm was obtained. The respective drawings show the sound pressure
frequency characteristics of the speaker person using the speaker diaphragm of the present
invention and the speaker B using a conventional cloth edge.
Since the product of the present invention is light in weight, the sound pressure level is high, and
it is reproduced to a higher frequency range. Effects of the Invention As described above, the
diaphragm of the present invention is configured, so that it is possible to produce a lightweight,
low-cost, high-input-proof speaker diaphragm by a simple manufacturing method, and as a result,
significant rationalization can be realized. Of industrial value.
Brief description of the drawings
The figure is a sound pressure frequency characteristic diagram of a speaker using the
conventional diaphragm and the diaphragm of the present invention.
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