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TECHNICAL FIELD The present invention relates to a speaker diaphragm. BACKGROUND ART In
general, performance required of a speaker diaphragm is lightweight, has high Young's modulus,
low density, and appropriate internal loss so that the output sound pressure frequency
characteristics of the speaker and the like can be favorably obtained. It is 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, it is formed by paper-making of the natural
material 1 which conventionally beats, the chemical fiber shoulder t, or the fiber material which
mixed these, by satisfying the above-mentioned required performance. The diaphragm is 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 a speaker or door mounting in an
automatic operation, the usage of the speaker is expanded, and the speaker touching water and
moisture is 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 the diaphragm, 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 There is known a method of heat-fusing the
resin and covering the main surface by subjecting a heated and pressed customer to heatpressing after forming a composite sheet of natural fiber, chemical fiber, or a fiber material
composited with these fibers. However, in the former diaphragm with anti-water treatment in the
above-mentioned conventional method, the waterproofness is high and the Young's modulus is
large, but since the density is large and the internal loss is small, flattening of the sound pressure
frequency characteristics is difficult . Also, if the latter method is used, heat rrJW until it has
sufficient waterproofness! Adding resin contamination usually reduced the 17-ring rate and
decreased the output level in the sound pressure frequency range and efficiency as well. Thus,
the conventional speaker diaphragm can not simultaneously satisfy sufficient waterproofness
and preferable physical properties such as Young's modulus, density, and internal loss. (1)
Therefore, an object of the present invention is to provide a speaker diaphragm having sufficient
high Young's modulus, low density and sufficient water resistance while offsetting internal lit
loss. The speaker diaphragm of the present invention is a natural lllff, chemical! [I or [a mixture
of these is formed into a sheet and impregnated with a polyurethane resin solution and dried and
cured to form a pl, and a coating of an ultraviolet curable resin disposed on the main surface of
this slump] There is.
EXAMPLES Examples of the present invention will be described below with reference to
correction drawings and the following table. First, as a raw material, a natural lJ miscellaneous,
for example, NBKP (a needlewood tree exposed and a club 71 to a valve) is subjected to beating
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 Kq / C112 to form a
substrate. Next, a polyurethane resin solution is compounded and prepared as shown in Table 1.
A prepolymer isocyanato obtained by the reaction of a functional polyol with a diisocyanate is
diluted with a solvent such as Shimbu, and a solution is used. Then, a corn-shaped substrate is
dipped in the prepared solution to impregnate the solution between the valves forming the
substrate and the solution in the substrate to allow the fibers in the substrate to be f)
impregnated with the polyurethane resin. Thereafter, the solvent is volatilized and dried by hot
air at a temperature of about 60 ° C. in the dryer. Further, solutions of UV curable resins (1), (2)
and (3) are blended and prepared as shown in Table 2. The three types of UV curable resins are
separately applied to the base H separately, and the corresponding three diaphragms (1), (2) and
(3) are ffi made. Table 2 Then, a solution of an ultraviolet curable resin is applied by spray
spraying, immersion or the like to the J-1 surface of the base material after drying. At this time,
in order to make the coating of the UV curable resin have a desired thickness, it can be easily
done by adjusting the viscosity and the amount of adhesion of the solution. Thereafter, a setting
time of 1 to 3 minutes is taken, and the ultraviolet curable resin is cured by performing
irradiation with ultraviolet light for 2 to 4 seconds from a distance of about 10 cm for 2 to 10
seconds. 1- After the process described! Three types of speaker diaphragms (1), (2) and (3) are
obtained by n-cutting 1 ttA into a predetermined shape. Although waterproofing of Group I by
paper-making of natural fiber paper requires clogging of these porous systems, pre-polymeric
isocyanate in polyurethane-based resin is self-polymerized by heat, moisture, etc. to form a threedimensional polymer In order to form, the sealing effect is sufficiently exhibited even under the
conditions as in this embodiment. However, for example, when the bond between the fibers is
weak when the diaphragm substrate is dried without pressing with a mold or the like, the
prepolymer isocyanato fat and poly A4 rigid such as glycol and 1-lyol. By adding a compound or
a polyamino compound such as diamine or triamine as a curing agent, higher sealing effect and
water resistance can be imparted to IJI4.
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 sectional view of a portion
shown by a circle A in FIG. 1, and forms a substrate 4! The miscellaneous 1 is sealed with a
polyurethane resin 2. In addition, a coating 3 made of an ultraviolet curable resin is formed on
one edge of the substrate 4. Here, as the coating 3 of the ultraviolet curable resin is uniformly
and thickly formed on the main surface, the waterproof effect to the inside of the U material 4
becomes larger. Therefore, the bond between the fibers 1 as strong as possible and the clogging
with the polyurethane resin further enhance the effect. The fiber If11 represents a natural fiber
or a chemical fiber, and the base material 4 is formed by forming one of or a mixture of these
fibers. Table 3 shows the diaphragms (1), (2) and (3) of the three examples of the present
invention corresponding to the respective ultraviolet curable resins, and each of the substrates
not waterproofed yet. The physical property values of are shown. / 'When comparing the two, the
diaphragm of this example has an extreme increase in density (and then both the Young's
modulus and the internal loss increase, and the characteristic of the base material is utilized
Recognize. Moreover, according to JIS-P8117, the results of the air-flow test based on JIS-P8117
for the present invention, all of the present examples, while the unworked 11jl material is 53.3
seconds between 100 CC passes vj. The diaphragm of the above had been closed enough not to
reach 100 cc after 10 minutes. Furthermore, FIG. 3 shows the output sound pressure frequency
characteristic curve A of the speaker by the diaphragm (2) of the present embodiment measured
under the same conditions, and the output sound pressure of the speaker by the diaphragm
consisting of a base material not waterproofed. It is a graph which shows the frequency
characteristic curve B and compares both. It can be seen that the loudspeaker with the
diaphragm of the present embodiment has less split resonance, and flat output sound pressure
frequency characteristics are obtained between the high sound areas. In the present embodiment,
natural fibers are described, but chemical fibers or composites thereof can 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 beaten pulp in the papermaking
process. According to the present invention, since the polyurethane resin cures at a relatively low
temperature according to the present invention, even a material outside the range of heat
treatment by I3 (a material including rj fiber M material including, for example, synthetic fibers)
A diaphragm having a hardness equal to or higher than that of the curable resin and
waterproofing and water resistance right can be obtained. Since the sealing effect is sufficiently
exerted even without heat pressing, the adverse physical effects such as increase in density of the
substrate and decrease in internal loss due to heat pressing are eliminated and the physical
properties of the substrate can be fully utilized. .
Because the substrate is sufficiently sealed, a solution of UV curable resin does not get into the
substrate. Depending on the application of the diaphragm, the thickness and hardness of the
coating for waterproofing may be applied or soaked. It can be easily adjusted by i1 etc.
Brief description of the drawings
1 is a cross-sectional view of the speaker river 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
using the diaphragm according to the present invention It is a graph which shows the output
sound pressure frequency characteristic of.
Explanation of the sign of the main part
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