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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 and the like. The
performance required of the prior art speaker diaphragm is that the elastic modulus (Young's
modulus) is large, the density is small, the internal loss is appropriately large, and the reliability
is high. Conventionally, as for the diaphragm of a general speaker, as shown in FIG. 3 to the
principal part sectional view of a diaphragm, the scaly mica 1o is SWt-20 wtI! With respect to the
natural pulp fiber 9. %) The mixed plate 10 is immersed in a melter 12 containing a synthetic
resin solution 110 as shown in FIG. 4 and dried. Then, as shown in the cross-sectional view of
FIG. 6, the synthetic resin liquid 11 (hatched portion) is impregnated on the surface and the
inside of the diaphragm 80. In the diaphragm 8 shown in FIG. 3, for example, 10 Wt (%) of scaly
mica 1o treated with a surfactant is mixed with the natural pulp fiber 9 to make a paper sheet. In
this case, it is very difficult to use 100% of the scaly mica 1o, and it is reduced by about 10%
during beating and by about 10% during sheet-making, resulting in waste in cost. Furthermore,
the synthetic resin solution 11 easily penetrates to the inside of the diaphragm 8 and the internal
loss is reduced. Therefore, the present invention provides a speaker diaphragm that can solve
this problem. Means for Solving the Problems The present invention is a method of
manufacturing a diaphragm for a speaker, wherein a treatment liquid obtained by adding scaly
mica to a synthetic resin liquid is applied to the surface of a diaphragm made of natural pulp
fibers. Action: A treatment liquid comprising scaly mica added to a synthetic resin solution is
coated on the surface of a diaphragm made of natural pulp fibers, and as a result, the diaphragm
has an appropriately large internal loss and a large elastic modulus, and Become. EXAMPLE
Hereinafter, a speaker diaphragm in an example of the present invention will be described. FIG. 1
shows the state in which the treatment liquid is applied to the diaphragm. FIG. 2 is a crosssectional view of the main part of the diaphragm after surface treatment. First, as shown in FIG.
1, 6 wt% of synthetic resin solution 1t is prepared by using a solvent of nitric acid cellulose and
trocellulose, and 15 wt to 20 wt of scaly mica 2 with respect to the synthetic resin solution 1).
Add to make a paint 3 and store in the tank 4 of the coating machine. Next, the paint 3 is sprayed
from the nozzle 6 to the surface (front and back) of the vibration e, and drying is finally
performed. FIG. 2 shows a cross-sectional view of the present invention, and the paint 3 is
applied to the surface of the diaphragm 6. Table 1 shows the comparison of the physical
property values of the conventional diaphragm and the loudspeaker diaphragm of the present
invention. Table 1 Effects of the Invention As described above, according to the present
invention, the surface of the diaphragm made of natural pulp fibers is coated with a paint in
which a synthetic resin liquid and a scaly mica which is a high elastic material are mixed. The
interior has an internal loss of a suitable size, the surface has a high modulus of elasticity, and it
is cost effective as it requires only a small amount of application by a spraying method.
Brief description of the drawings
FIG. 1 is a schematic view showing the coating method of this embodiment, FIG. 2 is an enlarged
sectional view of the main part of the diaphragm obtained in FIG. 1, FIG. 3, FIG. 4 and FIG. 1
shows a method according to FIG.
1 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и flakes mica, 3 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и tank ░ и и и и и и и и и и и и и и и и и natural pulp fiber. Name of agent
Attorney Nakao Toshio and one other person Figure l! -Joint prayer liquid 4 Fig 5
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