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TECHNICAL FIELD The present invention is applied to a speaker diaphragm. BACKGROUND ART
As performance generally required for a speaker diaphragm, it is lightweight, has high Young's
modulus and low density, and has a proper internal loss so that the output sound pressure
frequency characteristics etc. of the speaker can be obtained favorably. It is doing. That is, the
smaller the Young's modulus density, the higher the resonant frequency of the diaphragm, and
the piston movement area is expanded! The frequency band of the lens b is broadened, and as
the internal loss increases, the split resonance of the diaphragm decreases and the frequency
characteristic flattens. As a diaphragm which satisfies the above-mentioned required
performance from such a thing, it is formed by papermaking of I1 group moon material which I
have conventionally beaten human made fiber M [, chemical fiber or these mixed. The diaphragm
is widely manufactured. Such a diaphragm is weak to the moisture and moisture of C which is
manufactured by paper-making, and the swelling due to the absorption of moisture and the
deterioration of its performance occur. However, recently, as in the case of outdoor use of
speakers and door mounting in automobiles, the usage of speakers has been expanded, and
speakers that touch water and moisture are increasing. Accordingly, the diaphragm itself of the
speaker is also required to have water repellency and water resistance. As a conventional method
for increasing the water resistance of a vibrating plate, for example, a method of attaching a
thermosetting resin to a base material after paper making and subjecting it to a treatment such
as heating and pressing to cover the main surface, a fibrous thermoplastic resin A method is
known in which a resin and a natural 1ltIi, a chemical fiber or a fiber material composited with
these are mixed and formed, and then subjected to a treatment such as heat and pressure to
thermally fuse the resin to cover the main surface. However, in the case of the moving plate with
waterproofing of the former method of the above conventional method, -C is highly waterproof
and has a large Young's modulus, but its high density and small internal loss make it difficult to
flatten sound pressure frequency characteristics. is there. When the latter method is used, adding
a thermoplastic resin fiber to have sufficient waterproofness reduces the Young's modulus, and
along with the decrease of the output level at J3 in the high frequency range of the sound
pressure frequency characteristic It also used to be inefficient. As described above, the
conventional speaker diaphragm can not simultaneously satisfy sufficient waterproofness and
preferable physical properties such as Young's modulus, density, and internal loss. SUMMARY OF
THE INVENTION Therefore, an object of the present invention is to provide a speaker diaphragm
having sufficient water resistance while having high Young's modulus, low density and sufficient
internal loss. The diaphragm for a speaker according to the present invention is formed on a
main surface of this tillage, a substrate which is formed by forming natural fibers, chemical fibers
or a mixture thereof, is impregnated with a polyurethane resin solution and is dried and cured. It
is characterized by the provision of a polyester resin and the 7) appearance.
Embodiments Hereinafter, one embodiment of the present invention will be described based on
the attached drawings and the following tables. First, a natural fiber set 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 paper
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 / C 112 to form a substrate. Next, a polyurethane resin solution is
compounded and prepared as shown in Table 1. Table 1 Here, as the polyurethane resin, for
example, a solution obtained by diluting a prepolymer isocyanate obtained by the reaction of a
trifunctional polyol and a diisocyanate with a solvent such as thinner is used. The C-shaped
solution is dipped in the solution in the form of "C1" to impregnate the solution between the
fibers of the valve forming the substrate to attach the polyurethane resin to the NH in the
substrate. Thereafter, the solvent is volatilized and dried by hot air at a temperature of about 60
° C. in a dryer. Further, a polyester resin solution is formulated and prepared as shown in Table
2. Second, the acrylic resin is preferably an acrylic ester, and the styrenated alkyd resin is a
copolymer of a styrene monomer with a polyester of a dihydric acid such as phthalic anhydride
and maleic anhydride and a polyol. Are preferred. A polyester resin solution is attached to the
main surface of the base after drying by spray blowing, immersion or the like. Under the present
circumstances, in order to make the film of polynisfur-type tree 11H into a desired thickness, it
can be easily done by adjusting the viscosity and the amount of adhesion of the solution.
Thereafter, C drying is performed again by hot air at about 100 ° C. in a drier to form a
polyester resin film firmly on the main surface of the substrate. The base material having
undergone the above-described process is cut into a predetermined shape to obtain a speaker
diaphragm. The waterproofing of the base material by paper making such as natural fiber
requires the closure of these porous systems, but the prepolymer isocyanate in polyurethane
type # 1 fat is self-polymerized by heat, moisture, etc. and it is a three-dimensional polymer
Therefore, the sealing effect is sufficiently exhibited even under the conditions as in this
embodiment. However, for example, the diaphragm base material is added to the mold with a
mold 11-! Higher bond by adding polyoxy compounds such as glycol and triol and polyamino
compounds such as diamine and triamine to Blepoly 7-itschianate as a curing agent when the
bond between m and n when dried to f is weak The stopping effect and the water resistance can
be f-J 'Jj applied to the substrate.
FIG. 1 is a cross-sectional view of the speaker diaphragm of the present embodiment obtained in
this manner, and shows a cone-shaped one. FIG. 2 is an enlarged cross-sectional view of a portion
shown in a circle in FIG. 1 (The base 4 is machined and the machine N1 is sealed with a
polyurethane resin 2. Further, on the main surface of the substrate 4, a coating 3 is formed of
polyester resin. Here, as the coating 3 of polyester resin is formed uniformly and thickly on the
main surface, the waterproofing effect to the inside of the base 4A4 is greatly enhanced.
Therefore, there is a possibility that the bonding between the strong fibers 1 and the closure by
the polyurethane resin can further enhance the effect. J, fiber 1 is natural fiber or chemical! A
shoulder 1 is shown, and a spacer 4 is formed by forming a single or charged mu of the fibers
into a C shape. Table 3 shows the physical property values of the diaphragm of this example and
the base material that has not been waterproofed yet. From the comparison of the two, the
diaphragm of this embodiment is characterized in that the characteristics of the group H are
utilized by increasing both the 17-ring rate and the internal loss after eliminating the extreme
increase in the density. Recognize. In addition, as a result of conducting an air permeability test
based on JIS-P8117 on the diaphragm of the present invention, the 100CC penetration time is
53.3 seconds for the untreated base material, while the diaphragm of this example is 10 for
103.3 seconds. Even after a minute, it did not reach 1000C or less and sufficient closing was
made. Furthermore, FIG. 3 shows the output noise of the loudspeaker by the diaphragm
consisting of the base plate J which has the output sound f1-frequency characteristic curve A of
the loudspeaker and the base material not waterproofed in the diaphragm of this embodiment
measured under the same conditions. There is a graph showing the sound pressure frequency
characteristic curve B and comparing the two. It can be seen that the output sound pressure
frequency characteristic is obtained in the loudspeaker with the diaphragm of the present
embodiment, which has less split resonance and is flat between the rattling regions. In the
present embodiment, the natural fibers have been described C, but chemical fibers or their
composite rods may also be applied. Further, in the papermaking process, the waterproofness
can be improved by adding an internal haze such as ureaformaldehyde resin or styrene-based
resin to the beating valve. Effect of the Invention According to the present invention, since the
polyurethane resin cures at a relatively low temperature, a material which is difficult to be heat
treated at a high temperature (a fiber shoulder material forming a base material, for example,
including synthetic fibers) is also precurable. A diaphragm having a hardness equal to or higher
than that of the resin and having a right-handed waterproof property is obtained. Even if it is not
heat-pressed, it can exert its closing effect on the sale, so that there is no acoustic adverse effect
such as increase in density of the substrate and decrease in internal loss due to the heat-press. It
The solution of the polyvinyl chloride resin does not get into the substrate because the substrate
is sufficiently sealed. Therefore, depending on the application of the diaphragm, the thickness
and hardness of the coating for waterproofing are applied, dipped, etc. It can be easily adjusted
Brief description of the drawings
Fig. 1 shows 4Fit for the speaker of the present invention.
F! FIG. 2 is a cross-sectional view of a plate II, FIG. 2 is an enlarged cross-sectional view of a
portion shown by a circle in FIG. 1, and FIG. 3 shows output sound pressure frequency
characteristics of a speaker using a diaphragm according to the present invention He is a grano.
Explanation of mark V3 of the one third base part
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