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FIELD OF THE INVENTION The present invention relates to a speaker diaphragm used for
various acoustic devices, and relates to a speaker diaphragm excellent in weight reduction, high
elastic modulus and high rigidity. Prior Art In order to improve rigidity as shown in FIG. 4, the
conventional speaker diaphragm is made by mixing high-elasticity fibers 7, for example, alumina
fibers of crystalline fibers or carbon fibers with natural pulp fibers e in a uniform manner. The
diaphragm obtained by doing was put to practical use. As for the problems to be solved by the
invention, the conventional speaker diaphragm has the following problems with respect to
weight reduction and bending rigidity. That is, since it is necessary to improve the physical
properties of the material in order to reduce the weight, reinforcing fibers are blended in natural
pulp fibers, but the specific gravity is 1.7 to 1. when carbon fibers are used. ag / cps Aramid
fibers at 1.44-1.46 g / an. The specific gravity of natural pulp fibers is 0.4 to o, s g / cm, which is
about% of reinforcing fibers. When reinforcing fibers are added to natural pulp fibers, the elastic
modulus is improved, but the flexural rigidity is conversely reduced because the surface
thickness can not be obtained. This is because the flexural rigidity is proportional to the cube of
the surface thickness. In addition, if the number of reinforcing fibers is increased, the internal
loss is reduced, and a flat characteristic can not be obtained in the sound pressure frequency
characteristic. In addition, if the blending ratio of reinforcing fibers is increased, there is a
disadvantage that the cost is increased. Therefore, the present invention is to provide a speaker
diaphragm having excellent weight reduction, high rigidity and high elastic modulus at low cost.
Means of Solving the Problems In order to solve the problems, the present invention
copolymerizes a thermoplastic resin to form a cocoon wall, microcapsules in which furin gas is
enclosed inside, and reinforcement of high modulus Carbon fiber as a fiber, aramid fiber. Ceramic
fibers are mixed with natural pulp fibers and formed. Approximately 50 times to 70 times the
volume is expanded by heating the microcapsules containing butane gas in the inside by co-
polymerizing the functional thermoplastic resin and butane gas at 120 ░ C to 140 ░ C for about
5 to 10 seconds (Bubbling), utilizing the property that specific gravity is o, 04 to o, os g / cm,
weight reduction and obtaining surface thickness by foaming to improve bending stiffness and
internal loss, reinforcing fiber with a specific elastic modulus of 1 bending By improving the
rigidity, it becomes a lightweight speaker diaphragm having excellent physical properties.
EXAMPLE Hereinafter, a speaker diaphragm in an example of the present invention will be
described. FIG. 1 is a view showing the state in which various materials of the present invention
are beating, FIG. 2 is a cross-sectional view of the main part of the diaphragm of the present
invention, and FIG. Sound pressure frequency characteristics comparison diagram of FIG.
First, natural pulp fiber (NUKP) 1 is beaten with a beater (beating machine) to a beating degree of
eoo to 70 oCC with Canadian freeness. Next, to the natural pulp fiber (NUKP) 1, 1 wt% of a
reinforcing fiber (carbon fiber-fiber length 3 to 6) 2 is blended in a weight ratio. After
disaggregating for a while, the microcapsules 3 are blended in a weight ratio of Swt% with
respect to the natural pulp fibers 1, and an acrylic resin 4 as a binder for the microcapsules 3 is
internally added with 1 to 2 Wtl to the natural pulp fibers 1. Finally, fixing is performed with a
sulfuric acid band for fixing, and the pH is adjusted to 4 to 6. 5 is water. The microcapsules 3 are
fixed to the natural fiber 1 in a beater by the above method. Next, it is made into a fixed weight
with a papermaking net, and molded for 5 to 10 seconds with a molding die with a mold
temperature of 180 ░ C. to 200 ░ C. to evaporate moisture. The coefficient of thermal
expansion of the microcapsule 3 at this time is 50 to 70 times. The specific gravity is 1.13 g / L:
1 n before foaming, and 0.04 to O, O5 after foaming. The speaker diaphragm obtained by the
above method is shown in FIG. As apparent from the figure, the microcapsules 2 expanded
between the natural pulp fibers 1 are fixed and further reinforced with the reinforcing fibers 2 as
a whole. Table 1 shows physical property values of the conventional product and the product of
this example. Table 1 Effects of the Invention As described above, according to the present
invention, heat-expandable microcapsules and reinforcing fibers are blended in natural pulp
fibers, internal loss can be achieved, weight reduction and surface rigidity can be achieved, and
sound pressure can be achieved. In terms of frequency characteristics, the speaker diaphragm
has an improvement in sound pressure level and a flat characteristic with little distortion.
Brief description of the drawings
FIG. 1 is a view showing the state of various materials during beating in one embodiment of the
product of the present example, FIG. 2 is an enlarged view of a sectional view of the diaphragm
of the product of the present example, and FIG. FIG. 4 is an enlarged cross-sectional view of the
diaphragm of the conventional product when the plate and the diaphragm of the product of this
embodiment are used.
1 иииииии Natural pulp fiber, 2 иииииииииииииииииииииииииииииииии Expandable microcapsules, 4 ииииииииии Acrylic resin, 5
иииииии water. Name of agent Attorney Nakao Toshio and others 1 person---1-natural pulp-only 2reinforced-3--micro cassettes Fig. 2 Fig. 3 Fig. 4
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