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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for a speaker used in various acoustic devices. 2. Related Art A cotton or
polyamide woven fabric coated with a resin such as 5BR-NBR or a urethane foam sheet has been
used as the edge base material of a conventional speaker diaphragm. Problems to be solved by
the invention 100% cotton woven fabric is weak to heat and moisture resistance, etc. Moreover,
although the polyamide material has rigidity and good environmental resistance, the adhesion
between the substrate and the coating resin is poor, In particular, there was poor adhesion that
the edge material and the diaphragm were peeled off when the amplitude was large. In addition,
urethane foam sheets are widely used because of their strong amplitude characteristics and good
sound quality in the low-frequency range, but their resistance to reversion is difficult to use in
fields where ultraviolet light is strongly affected, such as outdoor applications and vehicles there
were. The present invention is intended to eliminate the above-mentioned conventional
drawbacks and to provide a speaker diaphragm having excellent weather resistance. Means for
Solving the Problems In order to solve the above-mentioned problems, the present invention
relates to 3 to 10% by weight of pigment and Oj to 1% by weight of benzo 7 during the foaming
process of polyester or polyether flexible polyurethane foam. An edge material formed by adding
a triazole-based ultraviolet absorber is formed by heating and molding into a predetermined
shape, and is bonded to a diaphragm main body. By virtue of the above-described configuration,
the pigment and the ultraviolet light absorber inside the edge material block the penetration of
the ultraviolet light and cause the reflection so that the weather resistance is greatly improved.
Embodiments Hereinafter, one embodiment of the present invention will be described with
reference to the drawings. In FIG. 1, reference numeral 1 denotes a cone-shaped diaphragm main
body configured by papermaking of pulp fibers and the like, and reference numeral 2 denotes an
edge material coupled to the outer peripheral portion of the diaphragm main body 1. The
polyether urethane resin is mixed with about 7% by weight of pigment and about 0.6% by weight
of liquid benzotriazole y-based UV absorber, foamed to form a urethane foam, and sliced to an
arbitrary thickness. The edge base material was constructed. This edge base material was molded
under conditions of a mold temperature of 200 ° C. and a pressing time of 30 seconds to form
an edge material 2 shown in FIG. 1 and attached to the diaphragm main body 1 to obtain a
speaker diaphragm. Fig. 2 shows the relationship between the strength retention ratio and the
change with time of the diaphragm for a speaker of the present invention and the one using an
edge made of a conventional foamed urethane sheet, and Fig. 2 shows that the present invention
is far superior Result. As described above, since the speaker diaphragm of the present invention
is configured, the pigment and the ultraviolet absorber prevent the penetration of the ultraviolet
light, and thus the industrial value is greatly enhanced to improve the weather resistance.
Brief description of the drawings
FIG. 1 is a cross-sectional view showing one embodiment of the speaker diaphragm of the
present invention, and FIG. 2 is a characteristic diagram showing the results of the weathering
test of the present invention.
1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · edge material.