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TECHNICAL FIELD The present invention relates to a water repellent diaphragm used for a
speaker. Load suspension technology In general, the performance required for the diaphragm for
skis and beakers is a 5-light G and high Young's modulus and low density so that the output
sound pressure frequency characteristics etc. of the speaker can be obtained favorably. It is to
have an internal loss. 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. As a diaphragm satisfying
the above-described required performance, a diaphragm formed of a paper-made substrate of a
conventionally beaten natural fiber, a chemical fiber, or a fiber material in which these are mixed
is manufactured (manufactured). However, since such a diaphragm is manufactured by paper
forming, it is weak to moisture, absorption of moisture occurs in the air due to rise of humidity or
water droplets, and performance is degraded due to swelling or the like. Recently, the usage of
the speaker has been expanded, such as the use of the speaker outdoors and mounting on a door
mount in a car, and moisture and the ability to touch water droplets are increasing. Therefore,
the diaphragm itself of the speaker is also required to be water-repellent and waterproof. As a
conventional method for increasing the waterproofness of the diaphragm, for example, a method
of attaching a thermosetting resin to a base material after paper making and subjecting it to
treatments such as heating and pressure to cover the main surface, thermoplastic resin fibers
and There is known a method of mixing thermoplastic resin fibers with natural fibers, performing
heat treatment, pressure treatment and the like to thermally fuse the thermoplastic resin fibers to
cover the main surfaces. However, in the case of the diaphragm that has been waterproofed to
adhere the former thermosetting resin, its waterproofness is high and its Young's modulus is
large, but its mass is greatly increased, its density is large, and its internal loss is small. Is
difficult. When the latter method of mixing thermoplastic resin fibers and natural fibers is used,
adding thermoplastic resin fibers to have sufficient waterproofness reduces the Young's modulus,
and the sound pressure frequency characteristics in the high frequency range As the output level
decreased, the efficiency of the loudspeakers usually decreased. As described above, in the
conventional diaphragm described above, it is impossible to simultaneously satisfy the desirable
physical properties of the formed diaphragm as the diaphragm such as sufficient moisture
resistance, waterproofness, Young's modulus density, internal loss, etc. It was not possible to take
advantage of the excellent performance of the diaphragm produced by (1) Bean hull II Therefore,
an object of the present invention is to provide a speaker diaphragm having sufficient
waterproofness while maintaining the preferable physical properties as a diaphragm.
The diaphragm for a speaker according to the present invention comprises a base material made
of paper stock made of natural fibers, chemical fibers or a mixture of these as main materials and
having zirconium salts attached to the fibers, and a main material of the base material. It is
characterized by consisting of a resin film formed on the surface. EXAMPLES Hereinafter,
examples of the present invention will be described based on the attached drawings. First, as a
first embodiment, a diaphragm is manufactured in the next step. The natural mN of NUKP
(coniferous unbleached craft valve) is refined as a raw material and refined r! Adjust to 125 to 27
degrees SR. Thereafter, the resultant is dispersed in a suspension in a paper making tank, and
paper making is performed using a desired imaging plate shape, for example, a cone-shaped
papermaking net, and then, a cone-shaped die having a temperature of about 180 ░ C. 5 Dry
under a pressure press of about 0 KQ / Cm 2 to form a cone-shaped substrate. Next, as a
zirconium compound, for example, zirconyl ammonium monimum ((NH4) 2ZrO (CO3) 2) is
dissolved in an organic solvent such as ethylene, etc. as a solvent and the specific gravity is
1.340 (20 ░ C.) Prepare a zirconium compound solution with a viscosity of about 20 CP. Then,
the corn-shaped substrate is immersed in the prepared solution to impregnate the solution
between the fibers from both sides to adhere the zirconium compound to the fibers in the
substrate. At this time, a film of the solution may remain on the main surface of the substrate. As
the solvent uses an organic solvent such as 1.1.1-trichloroethane, it can be attached without
weakening the bond between the fibers. After that, the solvent valve is volatilized and dried and
solidified by hot air at a temperature of about 100 ░ C. in a dryer. The high temperature
deposited zirconium compound causes a reaction of the following formula, (NH4) 2ZrO (CO3)
2Zr: 0 + 2NH + 2CO2 + H20 to form activated zirconia (Zr: O), and cellulose shown in the lower
formula of the fiber in this example, A chelate bond is formed between the oxygen atom attached
to a carbon atom of (CHO) 6 10 5 n and the activated zirconia, and the water repellency and oil
repellency are generated by the zirconium ion. Next, a solution of epoxy acrylate resin as shown
in Table 1 is prepared. The prepared epoxy acrylate resin solution is applied by spraying onto the
substrate after the adhesion treatment of the zirconium compound, thereby covering the main
surface. Under the present circumstances, in order to make the film of this resin into desired
thickness, it can easily be done by adjusting the viscosity of this solution, and the amount of
adhesion. Also, the solution may be deposited by immersion rather than spray spraying.
Thereafter, ultraviolet light of about 80 W / Cm 2 is irradiated for about 5 seconds to completely
cure the film, thereby forming an epoxy acrylate resin film on the main surface. The base
material having undergone these steps is cut into a predetermined shape to obtain the speaker
diaphragm of the first embodiment. Next, as a second embodiment, a diaphragm is manufactured
in the same process as the first embodiment. First, a paper-made substrate on which the
zirconium compound solution of Table 1 is attached in the same manner as in the first
embodiment is prepared. Next, as shown in Table 2, a resin solution is prepared on the main
surface of the substrate. The prepared resin solution is applied to both main surfaces of the base
material by spray spraying, and it is heated and dried, and then cut into a predetermined shape
to obtain the diaphragm of the second embodiment. FIG. 1 is a cross-sectional view of a coneshaped loudspeaker diaphragm of the present embodiment obtained by the above-described
manufacturing method. FIG. 2 is a partially enlarged cross-sectional view shown by a circle A in
FIG. 1, in which active zirconia adheres to the fiber M1 from the surface to the inside of the base
material 3 consisting of fibers 1 and is chemically bonded. Moreover, the fiber 1 shows a natural
fiber or a chemical fiber, and the base material 3 may be formed into a single sheet or a mixture
of these fibers. Furthermore, the upper layer portion is covered with an organic solvent soluble
resin film 2. Here, particularly when the zirconium compound is stopped in the vicinity of the
surface of the base material, the waterproof effect is high, and in the treatment with an organic
solvent-soluble resin, the water repellency of the zirconium ion (the size of the contact angle with
the organic solvent ) To minimize the penetration of the organic solvent and the resin into the
inside of the substrate to obtain a uniform coated surface. Table 1 shows the respective physical
property values of the diaphragms of the first and second embodiments and the diaphragms
made only of paper making. Comparing the two, the diaphragm of this example minutely
suppresses the increase in density and increases both the Young's modulus internal loss, and
fully demonstrates the excellent performance of the diaphragm made of 11M quality paper. .
With regard to waterproofness, as shown in FIG. 3, water 4 was added to the base material 3
after the treatment of each of the first and second embodiments, and left for 24 hours. There is
no penetration, and deformation of the substrate does not appear. Although zirconyl ammonium
carbonate ((NH4) 2ZrO (CO3) 2) was used as the zirconium compound in the examples of the
present invention, compounds selected from zirconyl chloride (zrOC12), zirconyl acetate (ZrO
(C2H302) 2), etc. It may be The solution is very useful as a waterproofing agent. In addition,
since the maximum coordination number of zirconium is octavalent, it has the ability to bind to
other ions or molecules, and this binding property is used to bind to hydrophobic substances
such as stearic acid, palmitic acid, oleic acid, etc. A higher degree of waterproofness can be
obtained by using it as it is.
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 beaten pulp in the papermaking process. Further, the present invention
exhibits the same effects as those of the above-described embodiment not only in the diaphragm
but also in other speaker members such as an etch and a center cap which are obtained by paper
forming. Effects of the Invention As described above, according to the present invention,
waterproofing can be performed without using complicated steps, and in particular, the
treatment by the heat press is not necessary, and the acoustics such as increase in density of the
substrate and decrease in internal loss There is no adverse effect on the surface and the physical
properties of the substrate can be fully utilized. Moreover, since the zirconium compound is
attached to the substrate by papermaking, a small amount of them can be attached because of
the strong water repellency and oil repellency, and further, the resin solution applied on the
substrate surface is applied to the inside of the substrate. The permeation is reduced, and the
coating of these resins can be formed thin. Thus, a lightweight diaphragm is obtained which has
increased strength and waterproofness and maintained acoustical properties.
Brief description of the drawings
1 is a cross-sectional view of the speaker diaphragm of the present invention, FIG. 2 is a partially
enlarged cross-sectional view shown by circle A in FIG. 1, and FIG. 3 is a cone-shaped
loudspeaker diaphragm of this embodiment It is sectional drawing at the time of putting water in
a recessed part.
Explanation of symbols of the main part 1 иии и и и 41 2 и и и и и и и и и resin coating
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