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Description 1, title of the invention
Carbon diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbon
diaphragm used for the main cil 'sound 41.-Generally for an acoustic mechanical good ** plate,
especially a thin plate used as a speaker diaphragm, it is efficient and wide In order to faithfully
reproduce the page in the shoulder wave band, it is lightweight and large in rigidity, and the ratio
of Young's modulus E and dense KP, ie, relative stiffness F! It is required that the size of the
material is large こ れ ら These points b & et al. Conventionally, materials such as wood pulp,
aluminum and titanium have been used, but it can be said that all of them have sufficient
properties. won. That is, E /! These materials include poron, beryllium, carbon, etc., but their
processability is poor, and when titanium and aluminum are used, their processability is
relatively good, but In physical properties, there was a defect that the relative stiffness l / j 'did
not increase 0. In the case of using a synthetic resin-based material, there was generally a
composite material with carbon fiber, but with the cords themselves Due to the lubricity of the
surface, the bonding of the synthetic resin is not sufficient, and it is difficult to obtain a large
rigidity as the moving plate EndPage: 1. The present invention has been made in view of the
above points. The object is that the object is formed of a composite material of scaly graphite and
a carbide of a synthetic resin, and the scaly graphite and a carbide of the synthetic resin are
bonded by a metal fine powder as a binder. Make it lighter To provide a carbon diaphragm which
is rigid and has high rigidity, high mechanical strength, excellent workability and low cost. The
present invention is a composite material of scaly graphite and a carbide of a synthetic resin. The
flake-like graphite is mixed with metal fine powder, heated and melted to be used as a binder of
carbides of the scaly graphite and the synthetic resin. It is a thing. Hereinafter, the details of the
present invention will be modified! 1 NIC will be explained First, in the first step, a synthetic resin
material is mixed with flake graphite. Next, in the second step, the metal flakes of the scaly
graphite and the synthetic resin material are mixed with the metal fine powder as a binder. As
the third step, the raw material which has passed through the respective steps is made into a
sheet The scaly graphite is oriented by carrying out. After that, as a fourth step, the shape of the
diaphragm, for example, if it is a sliding plate for a speaker, is molded by a vacuum forming
method or the like into a cone shape or a dome shape. As a fifth step, the mold is set in a vacuum
furnace and the heating temperature is gradually raised to carbonize the synthetic resin to form
its carbide.
In this case, if the mold is heated to about io O 0 C, the strength of the molded product is
increased, and the handling is good after that. The fine powder is heated and melted to promote
the bonding between the scaly graphite and the carbide of the synthetic resin and to grow as it is.
Ilc, which is grown as a step T, cools the scaly graphite and the carbide of the synthetic resin A
carbon diaphragm made of a composite material is obtained. When the present invention is
carried out, it does not matter whether the synthetic 5till material is a thermoplastic synthetic
resin or a thermosetting synthetic resin, but it is important that it can be made into a sheet and
can be carbonized 1 -Even if fat% f is good, for example, each synthetic resin such as polyvinyl
chloride, polyimide, phenol etc. with good carbon yield is the best t, as metal fine powder
mentioned here, for example, aluminum of 2 to 3 P, magnesium And light metals such as
beryllium are preferred. As a specific example, when the present invention is carried out with a
weight ratio of, for example, scaly graphite 200: vinyl chloride 100, the carbonization
temperature of polyvinyl chloride in the vacuum furnace in the fifth step is The melting
temperature of aluminum in the vacuum furnace is about 500 ° C., and the sixth step is tiss. It is
about ° C. Since the carbon swing plate 1 obtained by the present invention and metal fine
powder are heated and melted to form a binder of scaly graphite and a carbide of a synthetic
resin, both of phase change and Young's modulus are compared with those of conventional
products. Improved O, ie, relative stiffness is obtained by using a diaphragm such as scale-like
graphite and carbon fiber etc., and a diaphragm made by baking LEndPage: 2 or a conventional
diaphragm such as Al i = つ. It is large by comparison. Moreover, the rigidity and mechanical
strength are larger than those of conventional products using carbon such as those using
synthetic resin materials, graphite, etc., and compared to conventional diaphragms formed using
metal materials such as aluminum. It is light in weight and has excellent workability and low cost
as compared with the conventional products using Polon and Bej j thulium carbon. Patent
Applicant Pioneer Corporation EndPage: 3
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