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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a speaker diaphragm used in various acoustic devices. The
construction of the conventional example and its problems The manufacturing process in the
diaphragm completion 1 from the material of the conventional speaker diaphragm is one in
which polypropylene or polyethylene fiber is beaten and another in which reinforcing fiber such
as carbon fiber is cut into 3 to 4 +++++ 1 Is mixed well in water, made into paper and dried to
obtain a papermaking sheet, 2 S 9 t is heat molded with 200 to 250 ? ? C for 2 to 3 seconds,
and this is cooled to obtain a speaker diaphragm The In order to bond the voice coil to the
speaker diaphragm obtained in this way, the material of the diaphragm is polyethylene,
polypropylene, and a crystalline resin having a small polarity, in the bonding portion between the
diaphragm and the voice coil. Adhesion is difficult, and methods such as chemical treatment, heat
treatment, physical treatment, and ultraviolet light treatment may be considered. The following
two reasons may be considered as the role of obtaining surface activity in such a method. One is
that the polar group is increased by oxidation. One is that the surface is roughened and the
bonding area is increased. As the former method, it may be considered to immerse in a mixed
solution of dichromic acid and sulfuric acid, or to treat with an oxidizing agent such as ozone, but
it is not a good method because it has problems of pollution 9 working environment. In the case
of irradiating the purple ridge, problems of equipment, cost and environment remain. In addition,
it is not perfect in an insufficient way to obtain a sufficiently active surface. As another effective
method, electrical treatment by corona discharge can be considered, but the effect can be
obtained only for several hours after the treatment, and the problem remains that the voice coil
can not be stored for a short time j until the bonding step. SUMMARY OF THE INVENTION The
present invention solves such conventional problems, and provides a method of manufacturing a
speaker diaphragm having good workability, less problems with pollution 2 working
environment, and good adhesion. The purpose is to Constitution 1 of the Invention In order to
achieve the purpose described in the invention, the present invention is to treat the adhesive
portion of the paper making sheet based on polypropylene or polyethylene fiber with the voice
coil with a primer solution obtained by diluting polyurethane resin with ethyl acetate. After
drying, it is heated and shaped into a diaphragm shape, and by employing this method, the
primer treatment liquid is allowed to penetrate the paper sheet by primer treatment at the
completion of the paper sheet, and polyethylene fiber or polyethylene fiber or Since
polypropylene fUfl wraps around and becomes cool, it is possible to obtain sufficient effect even
after heating.
By taking this method, it is possible to perform primer processing continuously and measure the
adhesive property--in view of the example of O, see below, one example of the method for
producing the speaker diaphragm of the present invention, This will be described with reference
to FIGS. 2 and 3. First, FIG. 1 is a process diagram from completion of a sheet made of a sheet of
paper 1 in which a polypropylene fiber or polyethylene fiber alone or an organic / inorganic fiber
is contained in the above base material. The primer solution 2 is one obtained by diluting an
acrylic or chloroprene-reactive polyurethane resin with ethyl acetate. The primer solution 2 is
supplied to the felt 3 in an appropriate amount. Next, the papermaking sheet 1 is subjected to a
primer treatment in the same manner as a stamp method using only the cylinder 4 in the portion
that hits the neck portion of the diaphragm. Next, the primer solution 2 is dried by the dryer 5. At
this time, as shown in FIG. 3, the periphery of the polyethylene fiber 9 or polypropylene fiber 9
'is covered with the primer solution 2'. Next, the papermaking sheet 1 is softened by heating play
1-6 and 6 ', and finally, it is molded with a mold 7, 7' to obtain a diaphragm 8 for a speaker. FIG.
4 is a cross-sectional view in which the speaker J sliding plate 8 and the voice coil 10 are bonded
with an adhesive 11. The adhesive effect of the speaker diaphragm obtained by such a
manufacturing method is as follows. n = 10 (9/1 yvb) It is to be noted that acrylic adhesives have
almost the same value. Effects of the Invention As described above, the method of manufacturing
the speaker diaphragm of the present invention can be rationalized because the primer treatment
is performed in the process of manufacturing the diaphragm, and the line can be rationalized.
Alternatively, it is a dog of industrial value having the sound effect that the diaphragm can obtain
strength enough to cause material breakage.
Brief description of the drawings
FIG. 1 is a schematic process drawing showing one embodiment of a method of manufacturing a
diaphragm for a speaker according to the present invention, FIG. 2 is a block diagram showing a
paper sheet after primer treatment, and FIG. 3 is a speaker vibration It is sectional drawing which
shows the adhesion | attachment state of a board and a voice coil.
1 иииииии Papermaking sheet, 2 иииииии Primer liquid, 3 иииииииии Felt, 4 иииии Cylinder, 6 иииииииииииииииииииииииииииииииииииииии 6
'..... heated plate), 7, 7'-..... mold, 8 ..... diaphragm, 9, 9 '..... polypropylene or polyethylene fiber, 1
o. ..... voice coil, 11 ..... adhesive. Name of agent Attorney Nakao Toshio Other 1 person Figure 3 N
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