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TECHNICAL FIELD The present invention relates to a moving plate for a speaker. BACKGROUND
ART As performance generally required for a speaker diaphragm, there are moderate internal
losses with high Young's modulus and low density so as to mainly obtain good output sound
pressure frequency characteristics of the speaker and the like. It is doing. In other words, the
higher the Young's modulus and the lower the density, the higher the resonant frequency of the
diaphragm, the wider the piston movement area, and the wider the frequency range of the
speaker. The larger the internal loss, the smaller the split resonance of the diaphragm. The
frequency characteristic is flattened. From this point of view, as diaphragms satisfying the abovementioned required performance, diaphragms formed by paper-forming of conventionally beaten
natural ml, chemical fibers or fiber materials mixed with these are widely manufactured. . Since
such a diaphragm is manufactured by papermaking, it is weak to moisture and humidity, and
swelling due to absorption of moisture and deterioration of its performance occur. However,
recently, as in the case of outdoor use of speakers and door mounts and rear mounts in
automobiles, the usage of speakers has been expanded, and speakers exposed to water, moisture
and sunlight are increasing. Accordingly, the diaphragm itself of the speaker is also required to
have water repellency, water resistance, weather resistance, and the like. As a conventional
method for increasing the water resistance of the diaphragm, for example, a method of applying
a thermosetting resin to a base material after paper making by coating to apply a treatment such
as heating and pressing to cover the main surface, a base after paper making There is known a
method in which a material is impregnated with a solution of a suitable polymer, and subjected to
treatments such as drying, heating, pressurization and the like to cover the entire surface from
the main surface of the substrate to the inside with a resin of the polymer. However, the former
waterproof of the above conventional method! +! lJ!! In the diaphragm in which + is
made, the waterproofness is high and the Young's modulus is large, but since the density is large
and the internal loss is small, it is difficult to flatten the sound pressure frequency characteristics.
In addition, in the case of using the superior method, if the polymer solution is impregnated and
attached to have sufficient waterproofness, the base teeth become layered and the Young's
modulus becomes small, and the high pressure range of the sound pressure frequency
characteristic The efficiency always decreased with the decrease of the output level at the
Furthermore, in any of the above methods, there is a problem in the weather resistance, and for
example, when strong direct sunlight is received for a long time, etc., the resin covering the
diaphragm degrades and yellows. As described above, the conventional speaker diaphragm can
not simultaneously satisfy the physical characteristics as a diaphragm such as Young's modulus,
density, and internal loss, and waterproof weatherability. SUMMARY OF THE INVENTION An
object of the present invention is to provide a speaker diaphragm having sufficient water
resistance and sufficient weather resistance while having high Young's modulus, low density and
moderate internal loss.
The diaphragm for a speaker according to the present invention is provided on a main surface of
a base formed by forming natural uA impurities, chemical fibers or a mixture thereof,
impregnating a solution of an acrylic resin and adhering and curing the solution. It is
characterized in that it comprises the film of the ultraviolet curable acrylic resin. An embodiment
of the present invention will be described based on the attached drawings and the following
table. First, as a raw material, natural tlH, for example, NBKP (conifer bleached kraft valve) is
subjected to beating, and the beating degree is 20 to 22 degrees SR! J adjust. Thereafter, the
suspension is dispersed in a suspension in a paper making tank, and the desired diaphragm
shape, for example, a cone shape, is used for paper making, and then 3 ° in a cone shape mold
having a temperature of about 180′′C. The substrate is dried under a pressure press of about
OKg / Cm 2 to form a substrate. Next, MMA resin (methyl methacrylate) as an acrylic resin is
diluted with a suitable solvent such as thinner and the resin solution is compounded as shown in
Table 1 to make UA. Then, a cone-shaped base material is dipped in the prepared resin solution
to impregnate the solution between the m cords of the valve forming the base material, and the
acrylic resin is attached to the uA impurities in the base material. Thereafter, the solvent is
volatilized and dried by hot air at a temperature of about 60 ° C. to 80 ° C. in a dry state.
Further, a solution of an ultraviolet-curable acrylic 61 fat is blended and prepared. A solution of
an ultraviolet curable acrylic resin is applied by spray spraying onto the main surface of the base
after drying. Under the present circumstances, in order to make the film of this ultraviolet curing
type ultraviolet curable acrylic resin into desired thickness, it can easily be done by adjusting the
viscosity of the solution of this ultraviolet curable acrylic resin, and the amount of adhesion.
Thereafter, ultraviolet light of about 80 W / cm 'is irradiated for about 5 to 10 seconds to
completely cure the film, and a film of an ultraviolet curable acrylic resin is fixedly formed on the
main surface. The base material which has passed through these steps is cut into a
predetermined shape to obtain a moving plate for speaker. FIG. 1 is a cross-sectional view of the
speaker diaphragm 1 of the present embodiment obtained in this manner, and shows a cone
shape. FIG. 2 is an enlarged cross-sectional view of a portion shown by a circle A in FIG. 1,
wherein the valve lff2 is sealed with an acrylic resin 3 and UV-curable acrylic on a sealed
substrate The resin film 4 is provided and twisted. In this case, polyurethane resin and vinyl
borate resin are generally used as a filler, but in these cases the weather resistance is extremely
poor and the resin part is deteriorated, so that the sealing with acrylic resin having excellent
weather resistance is performed. Has been done.
The test results of the physical properties, waterproofness and weather resistance of the obtained
diaphragm according to this example are shown. First, in Table 2, physical property values of the
diaphragm of the present embodiment and a diaphragm made of only a base material that has
not been waterproofed yet are shown. When the two are compared, the diaphragm of this
example obtains physical properties substantially equivalent to that of the substrate after
eliminating the extreme increase in density, and there is no deterioration in physical properties
even after processing. I understand. Next, an air permeability test based on JIS-P8117 is
performed on the diaphragm and the untreated base material of the present invention to
compare the waterproofness of the both. As a result, it was 53.3 seconds in the case of the
untreated base material for the interval of 100 cc through-flow FR while it did not reach 100 cc
even after 10 minutes in the case of the diaphragm of this example. This indicates that the
diaphragm of the present invention has the same excellent waterproofness as that of a
diaphragm substrate impregnated with, for example, a polyurethane resin. Finally, the whiteness
in the weatherability test by sunshine super long life weather meter (Suga Test Instruments Co.,
Ltd., model WEL-8 LIN-) -10, black panel surface temperature 63 degrees, no watering) with
carbon arc as light source The temporal change of Y and the temporal change of yellowing
degree will be compared with each other for the 1 tifl I plate of the present invention and the
diaphragm impregnated with a polyurethane resin. FIG. 3 is a graph showing the change with
time of whiteness, line A shows the whiteness of the diaphragm of this example, and FJB shows
the whiteness of an IrXvJ plate impregnated with a polyurethane resin. It can be seen from FIG. 3
that even after 500 hours, the diaphragm of the present example has a smaller drop in whiteness
than that of the polyurethane resin. FIG. 4 is a graph showing the time-dependent change of the
degree of yellowing, line A shows the degree of yellowing of the diaphragm of this example, and
line B shows the degree of yellowing of the diaphragm impregnated with a polyurethane resin . It
can be seen from FIG. 4 that the diaphragm of the present hN example hardly changes even after
500 hours, and yellowing as in the case of the polyurethane-based resin (no degradation of the
resin occurs). In the above example, natural u! Although i has been described, it is also applicable
to a base material made of chemical fibers or composites thereof. In addition, the waterproofness
can be improved by adding an inner size material such as urea formaldehyde resin or styrene
resin to the beating valve in the papermaking process. Further, the present invention exhibits the
same effects as those of the embodiment described above not only with the diaphragm but also
with other speaker members such as a center cap and an edge which are obtained by paper
Effect of the Invention According to the present invention, by applying an acrylic resin to a
substrate made of paper and then forming a thermosetting acrylic resin film, it has
waterproofness and water resistance while maintaining excellent acoustic properties. And the
diaphragm which also has the weather resistance which was immersed is obtained.
Brief description of the drawings
1 is a cross-sectional view of the speaker diaphragm of the present invention, FIG. 2 is an
enlarged cross-sectional view of a portion shown by circle A in FIG. 1, and FIG. 3 is a speaker
diaphragm and polyurethane of the present invention. It is a graph which shows a timedependent change of the whiteness with the diaphragm impregnated with the resin, and FIG. 4
shows the yellowing degree U of the diaphragm with the diaphragm for the present invention σ
speaker and the diaphragm impregnated with the polyurethane resin. It is a graph which shows
Explanation of the sign of the main part
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