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TECHNICAL FIELD The present invention relates to a water repellent diaphragm used for a
speaker. (1) View I As the performance required for the speaker diaphragm in general, it is
lightweight and has high Young's modulus and low density and appropriate internal loss so that
the output sound pressure frequency characteristics etc. of the speaker can be obtained
favorably. It is to have. 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 base made of a beaten
natural fiber, a chemical fiber, or a fiber material made by mixing these is widely 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 use of the speaker outdoors and mounting on a door mount in a car, and the
speaker that touches moisture or water droplets is 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 subjecting a thermoplastic resin fiber to heat fusion and covering the main surface by
subjecting it to a process of mixing with natural fiber and subjecting it to processing such as
heating and pressure. 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 moving plate by papermaking. SUMMARY OF THE
INVENTION It is an object of the present invention to provide a speaker diaphragm having a
sufficient waterproofness while maintaining the preferable physical properties as a diaphragm.
The imaging plate for a speaker according to the present invention is characterized in that a
paper stock made mainly of natural fibers, chemical fibers or a mixture of these is paper-formed
and zirconium salts are adhered to the fibers. Embodiments of the present invention will be
described based on the attached drawings. First, the diaphragm is manufactured in the next step.
The natural fibers of NLJKP (softwood unbleached kraft pulp) are beaten as a raw material and
adjusted to a freeness of 25 to 27 degrees SR. Thereafter, the resultant is dispersed in a
suspension in a paper making tank, and papermaking is performed using a desired diaphragm
shape, for example, a cone-shaped papermaking net, and then, using a cone-shaped mold having
a temperature of about 180 ° C. It is dried under a pressure press of about 0 Ka / Cm 2 to form
a cone-shaped substrate. Next, for example, zirconyl ammonium monimum ((NH4) 2ZrO (CO3) 2)
as a zirconium compound is dissolved in an organic solvent such as ethylene as a solvent by
1.1.1-trituration, and the specific gravity is 1.340 (20 ° C.) Prepare a zirconium compound
solution with a viscosity of about 20 cP. Then, a corn-shaped substrate is immersed in the
prepared solution to impregnate the solution between the fibers from both major surfaces 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.
Thereafter, the solvent is volatilized to dryness and solidified by hot air at a temperature of about
100 ° C. in a dryer. The zirconium compound attached by this high temperature causes the
reaction of the following formula, (NH) ZrO (CO3) 2--Zr: O + 2NH + 2CO2 + 820 to form activated
zirconia (Zr: O), and the lower formula of the fiber in this example Cellulose shown in
(C6H1oO6). The chelate bond is formed between the oxygen atom attached to the carbon atom
and the activated zirconia, and the water repellency and oil repellency are generated by the
zirconium ion. 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 a cone-shaped moving plate for
a speaker of the present embodiment obtained by the above-described manufacturing method.
FIG. 2 is a partially enlarged cross-sectional view indicated by a circle A in FIG. 1, in which active
zirconia adheres to and is chemically bonded to the fiber 1 from the surface to the inside of the
substrate 2 consisting of the fibers 1. Also, the fiber 1 is a natural fiber or a chemical fiber, and
the vibration plate may be made of a single material or a mixture of these fibers. 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 the organic solvent-soluble
resin, the water repellency of the zirconium ion (the size of the contact angle with the organic
solvent) Penetration of the organic solvent and the resin into the inside of the substrate is
minimized to obtain a uniform coated surface.
Table 1 shows the respective physical property values of the diaphragm of this example and the
diaphragm of only paper making. Comparing the two, the diaphragm of the present example
suppresses the increase in density minutely and increases both the Young's modulus internal
loss, and fully demonstrates the excellent performance of the diaphragm made of fibrous paper. .
With regard to waterproofness, as shown in FIG. 3, water 4 was added to the base material 2
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 (GO3) 2) was used as the zirconium compound in the examples of the
present invention, compounds selected from zirconyl chloride (ZrOCl2), zirconyl acetate (ZrO
(02H3 o2) 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. At this time, it is conceivable to apply the resin solution to the base
material after the adhesion treatment of the zirconium compound by coating or immersion and
cover the main surface, but it is also considered to lead to an increase in the quality of the
diaphragm. It is necessary to select various resin compositions. However, in the present
invention, waterproof and water repellency is realized which is sufficient even with the
diaphragm of only the base material after the adhesion treatment of the zirconium compound. 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 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. In addition, since the zirconium compound is
attached to the base material by paper-making, a small amount of the adhesion is sufficient
because of the strong water and oil repellency.
Therefore, it is possible to obtain a lightweight diaphragm in which the waterproof effect to the
inside of the base material is increased and the acoustic characteristics are maintained.
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 recess of the coneshaped speaker diaphragm of this embodiment. It is sectional drawing at the time of putting in
Explanation of the code of the main part 1 ........ Fiber
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