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The present invention relates to a diaphragm for a speaker. 9 ULL Generally, the performance
required of the speaker diaphragm is mainly achieved by having high internal modulus and low
Young's modulus and low density so that the output sound pressure frequency characteristics
etc. of the speaker can be obtained favorably. It is doing. That is, the higher the Young's modulus
and the lower the density, the higher the resonant frequency of the diaphragm and the wider the
piston movement area, the wider the frequency range of the speaker, and the larger the internal
loss, the smaller the split resonance of the diaphragm. The frequency characteristic is flattened.
From such a thing, as a diaphragm which satisfies the above-mentioned required performance, a
diaphragm formed by paper-forming of mN material which mixed natural fiber, chemical fiber, or
these conventionally compounded conventionally is manufactured widely . 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, in the
diaphragm subjected to the waterproofing process of the former method of the above-mentioned
conventional method, although the waterproofness is high and the Young's modulus is large, the
sound pressure frequency characteristics are difficult to flatten because of the large density and
the small internal loss. When the latter method is used, if the polymer solution is impregnated
and deposited to have sufficient waterproofness, the weight of the base material increases and
the Young's modulus decreases, and the sound pressure frequency characteristics in the high
frequency range The efficiency always decreased with the decrease of the output level.
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. Therefore, an object of the present
invention is to provide a speaker diaphragm having a sufficient water resistance and a sufficient
weather resistance while having a high Young's modulus, a low density and a suitable internal
The speaker diaphragm of the present invention is characterized in that it is made of a base
material obtained by forming a natural silica, a chemical fiber or a mixture of these into a paper,
impregnating a solution of an acrylic resin and adhering and curing it. 1) L-1 Below, one Example
of this invention is described based on an attached drawing and the following tables. First, a
natural fiber such as NBKP (conifer bleached kraft valve) is beaten as a raw material to adjust the
beating degree to 20 to 22 degrees SR. Thereafter, the suspension is dispersed in a suspension in
a paper making tank, and papermaking is carried out with a desired diaphragm shape, for
example, a cone-shaped papermaking net, and then 3 ° in a cone-shaped mold at a temperature
of about 180 ° C. It is dried under a pressure press of about 0 kg / cm 2 to form a substrate.
Next, MMA resin (methyl methacrylate) as an acrylic resin is diluted with an appropriate solvent
such as thinner and the resin solution is compounded and prepared as shown in Table 1. Then, a
corn-shaped substrate is immersed in the prepared resin solution to impregnate the solution
between the IJA elements of the valve forming the substrate, and the acrylic resin is attached to
the fibers in the substrate. Thereafter, the solvent is volatilized and dried by a hot air at a
temperature of about 60 ° C. to 80 ° C. in a drier. Further, a stronger coating can be formed by
further adhering the MMA resin or the like to the base material after the impregnation, if
necessary, by re-impregnation or by impregnation with a substrate after the impregnation. The
base material having undergone these steps is cut into a predetermined shape to obtain a
speaker diaphragm. 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 crosssectional view of a portion shown by a circle A in FIG. 1, in which the fibers 2 of the valve are
sealed with an acrylic resin 3. Here, polyurethane resins and vinyl acetate resins 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 acrylic resin having excellent weather resistance can be used for sealing.
It is 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, the physical
property values of the diaphragm of the present embodiment and the moving plate consisting
only of the base material that has not been waterproofed yet are shown. Table 2 compares the
two, and the diaphragm of this example obtains physical properties almost equivalent to that of
the substrate after eliminating the extreme increase in density, and the physical properties
deteriorate even after the treatment. I know that is not. Next, an air permeability test based on
JIS-P8117 is performed on the imaging plate and the untreated base material of the present
invention to compare the waterproofness of the both.
As a result, the 1 oocc penetration time was 53.3 seconds in the case of the untreated base
material, whereas it did not reach 100 cc 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, a sunshine super long life weather-meter (Suga Test Instruments Co., Ltd., model
WEL-8UN-HD) in which the light source is a carbon arc. The changes over time in whiteness and
the changes over time in yellowing degree in the weathering test by the black panel surface
temperature (63 degrees, no watering) were performed on the diaphragm of the present
invention and the diaphragm impregnated with a polyurethane resin respectively Try to
compare. FIG. 3 is a graph showing the change with time of the whiteness, line A shows the
whiteness of the diaphragm of this example, and line B shows the whiteness of the diaphragm
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 this example hardly changes even after 500 hours, and there is no
yellowing as in the case of the polyurethane resin, and the resin does not deteriorate. In the
above embodiments, natural fibers have been described, but substrates made of chemical fibers
or their composites may also be applied. In addition, waterproofness can be further improved by
adding an inner surface sizing material such as urea formaldehyde resin and styrene resin to the
beating valve in the paper making 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 forming.
According to the present invention, according to the present invention, a diaphragm having
waterproofness, water resistance and excellent weatherability is maintained while maintaining
excellent acoustic characteristics by adhering an acrylic resin to a substrate made of paper. can
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 of the present invention It is a graph which shows a time-dependent change of the
whiteness degree with the diaphragm impregnated with a polyurethane-type resin, FIG. 4 is a
time-lapse of the yellowing degree of the diaphragm for speakers of this invention, and the
diaphragm impregnated with a polyurethane-type resin. It is a graph which shows change.
Explanation of the sign of the main part
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