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The present invention relates to a speaker vibrating body such as a diaphragm and a center cap
used for the speaker. A variety of vJ loudspeakers are known as shown in the cross-sectional
view of FIG. A magnetic circuit is constituted by an annular magnet 2 held by an annular yoke 1,
and a cylindrical voice coil bobbin 3 on which a voice coil 3a is wound is disposed at the center
of the magnetic circuit. The voice coil bobbin 3 is bonded to the center of the cone-shaped
diaphragm 4. The voice coil bobbin 3 is held by the frame 7 via the damper 6. The outer
periphery of the vibrating body 4 is held by the frame 7 via the edge 5. A center cap 8 is fitted at
the center of the vibrating body 4, and a Patkin 9 is attached to the outer peripheral portion of
the edge 5. The diaphragm 4 and the center main 11 tab 8 are vibrators for speakers, and those
obtained by molding a paper material are known. In order for such a speaker to faithfully convert
the input signal to an acoustic output, these vibrators should ideally perform a piston motion.
Therefore, at the same time as the vibrating body must be rigid, there must be a proper internal
loss to damp the unnecessary vibration. Heretofore, it has been desired that the vibrator has a
large Young's modulus in order to enhance conversion of electric power 萱, and an appropriate
internal loss in order to suppress the sharpness of the resonance frequency on the pressuresensitive frequency characteristic. The raw material fibers used for the vibrators as vibrators that
satisfy this demand to some extent are mainly made of so-called wood valves, and many of them
are mixed together with Manila hemp, bast lin with Mitaka, or synthetic fibers. It is done. Further,
in recent years, the installation application of the speaker has been greatly expanded, and in
particular, with regard to a speaker mounted on a vehicle, there is a demand for a speaker having
an improved water repellency, water resistance and oil resistance of the speaker vibrating body.
Furthermore, although various colorings of the speaker vibrating body are made, in particular,
those for vehicle mounting are required to have fastness to direct sunlight. The main component
of the speaker vibrator is a hydrophilic natural bulb, which has a property of absorbing water
and oil by capillary action in the gap between the valve fibers. Therefore, according to the
application, for example, a urea resin, a melamine resin, a rosin size or the like is added at the
time of paper making as an inward sizing to maintain the water repellency and the water
resistance depending on the use. In addition, a resin impregnation process is performed on a
vibrator which has been formed into a predetermined shape. For example, a speaker vibrator
having a certain degree of water resistance and oil resistance can be obtained by impregnating a
resin liquid having the resin composition of Table 1 into a vibrator base and drying it, for
example, a speaker for vehicle door mount In those cases where it was used for the purpose, it
was not possible to obtain a product that could sufficiently withstand severe conditions such as
Table 1 Also, in recent years, a speaker vibrating body formed by molding a thermoplastic resin
sheet such as polypropylene is adopted in part, but the effect of water resistance and oil
resistance is (q. As a result, the efficiency of the speaker decreased, and the weather resistance
and the like tended to deteriorate with the change of the material with the passage of time, and a
desired speaker vibrator was not obtained. Although direct dyes are used as coloring of vibrators
mainly made of wood bulbs, for example, basic dyes are also used for bulbs having a large
amount of lignin containing soot such as NUKP (non-softwood unbleached kraft bulb). In
addition, although a sulfur dye may be used in some cases, in any case, there is a drawback that
the color change does not have sufficient fastness to direct sunlight and is discolored. For
example, various pigments are known as a large number of light fastnesses, but since the
pigment is insoluble in water, there is a technical problem in the fixing method, the yield of the
vibrator is poor, or the vibration is Problems such as differences in color due to the surface of the
body and mourning have occurred. SUMMARY OF THE INVENTION It is an object of the present
invention to provide a speaker vibrator which is formed from wood valve fibers or the like as a
main raw material and has water resistance and oil resistance. The speaker vibrating body
according to the present invention comprises a base material made from natural fibers, synthetic
fibers, or a mixture thereof, an organic solvent soluble dye attached to Il # lt of the base material,
and cell D-acetate acetate. It is characterized by Below, an embodiment of the present invention
will be described based on the drawings and the following table. FIG. 1 is a figure which shows
the process of manufacturing the vibrating body of 1st Example. First, 100% NBKP pulp
(softwood bleached kraft valve) is swelled for about 15 minutes as a beating step S1 and charged
into a predetermined beating machine so that the valve concentration is about 3.0% so that the
physical properties of the valve are not impaired. Conduct and adjust the stock to the desired
beating r1120 'SR with a shopper type beating degree measuring machine. Next, after adjusting
the stock adjusted as the paper making process S2 to a valve liquid having a paper concentration
of about 0.05%, paper making of a vibrator of a desired shape is performed with a net made in
advance in a conical shape. Next, in a drying step S3, heat and pressure drying is performed at a
press pressure of 3 h / ct and a mold temperature of 180 to 200 ° C. using a predetermined
mold to obtain a vibrator base. Alternatively, it is dried at about 150 ° C. using a hot air
generator to obtain a vibrator. Next, the impregnation treatment agent of Table 2 is prepared
beforehand as an impregnation treatment. Table 2 A spiro dye (Aizen Spilon Black MH5-Llq:
Hodogaya Chemical Co., Ltd. stock) as an organic solvent soluble dye diluted with a nitrone
lacquer thinner (trade name) and prepared as the organic solvent soluble dye The dyed and
impregnated solution with 3% dissolved is prepared (84-).
As the organic solvent-soluble dye, for example, a dye-impregnated solution in which a metal
complex type dye, a derivative thereof or a metal-containing derivative of a basic dye or a mixed
dye thereof is dissolved in the diluted solution in a range of 2 to 3% is used. Also good. Then, as
the impregnation processing step $ 4, the substrate of the produced vibrator is dipped in the
dyeing and impregnating solution for about 5 degrees to perform impregnation and coloring.
Next, in the drying step S5, drying is performed for about 10 minutes with a hot air at a
temperature of about 90 to 100 ° C. in a drier to form a film of cellulose acetate butyrate resin
on the vibrator base. The coating adheres to the base fiber from the surface of the vibrator base
to the inside thereof and is interposed therebetween to exert a sealing effect. Thereafter, in the
forming step S8, a predetermined inner contour is cut to obtain a speaker vibrating body
according to the first embodiment provided with a desired resin coating. FIG. 2 is a view showing
the process of manufacturing the vibrator of the second embodiment. In addition, since the
processes from the refining process SI to the drying process S5 are the same, the processes will
be described in order from the second impregnation process S6. After the drying step S5, a
surface sizing agent solution of Table 3 is prepared in advance as a second impregnation step s6.
The vibrator base material having been subjected to the resin treatment is immersed in the
above-mentioned solution prepared in advance and adjusted about 3 degrees. Next, in the drying
step S7, drying is performed about 10 degrees by hot air at a temperature of 90 to 100 ° C.
using a dryer. Thereafter, the inner and outer diameters are cut at a molding step S8-stitching to
obtain the speaker vibrator of the second embodiment provided with a desired resin coating. The
samples are cut 1, 0 cm × 4 and 5 cm respectively from the J5 moving bodies of the first and
second embodiments obtained in Table 4 d, and 1 ang is obtained by the vibration lead method
in an environment of room temperature 20 ° C. and humidity 60%. The result of measurement
of the ratio E, 77 , is also shown along with the result of a similar test for comparison with a
conventional speaker vibrator, ie, a vibrator which has not been subjected to the impregnation
and immersion treatment in this example. Table 4 to Table 4 The first and second examples of
the example of the actual drop show an improvement of 56 to 58% in Hung rate and 15 to 16%
in TV'L (compared to the conventional speaker vibrating body) I understand that FIG. 3 is a graph
showing sound pressure frequency characteristics of speakers using the second embodiment and
the conventional vibrator, and curve A shows frequency characteristics of the diaphragm with a
diameter of 16α according to the second embodiment. Curve B shows the frequency
characteristics of a conventional diaphragm of diameter 16 cIR. As shown in the figure, the
characteristic curve A extends to a higher frequency than the characteristic curve B, and
indicates that Young's modulus and (T775 is improved.
With regard to the reliability of the vibrators according to the first and second embodiments, the
respective vibrators are adapted to the tests shown in Table 5 below. Table 5 According to the
present invention, a vibrator which can withstand the above-mentioned severe reliability test can
be obtained. Cellulose acetate butyrate (cellulose acetate butyrate) in the present invention is a
mixed ester of acetic acid and butyric acid combined with cellulose, and cellulose is made to react
with acetyl acetate, sulfuric acid as a catalyst, methylene chloride as a diluent, acetic acid And
add acetic anhydride to control the binding of butyric acid. Depending on the proportion of
butyric acid and butyric acid bound, cellulose acetate butyrate of various properties is obtained
19. The greater the proportion of oxalic acid bound, the lower its hygroscopicity. In addition,
cellulose acetate butyrate is flexible and flexible. Examples of freons include freon 11 (CC13F>,
freon 12 (CCjlzF2>, freon 22 (CHCρF2), freon 113 (CCNzF-CCjlzF), freon 114 (CCjz · CCρF2),
etc. Suspension polymerization or emulsion polymerization is carried out under a catalyst of soda
to obtain 19 polymers of freon. Moreover, as a freon derivative in this invention, there exist the
following, for example. In addition, n shows an integer! Tetrafluoroethylene polymer ············ CF 2 ·
CFz) 4-fluorinated ethylene-6-fluorinated propylene copolymer ······· 3-fluorinated ethylene
polymer ····· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
According to the present invention as described in Since the cellulose acetate butyrate film is
provided on the vibrator base material, for example, when it is used for a door mount of a
vehicle, the penetration into the vibrator by water such as rain, car wash, etc., and detergent
water In addition, a vibration body is obtained which prevents the penetration of fats and oils
such as oil and grease. Therefore, the strength of the vibrator does not decrease due to
penetration. In addition, since the surface of the base is a cellulose au-tate butylate coating, the
freon derivative is subjected to a surface waking treatment, so it is rich in solvent resistance and
heat resistance is also resistant to temperatures of 150 to 200 ° C. Also, there is no change in
acoustic characteristics such as damping characteristics in the low range, and a desired vibrator
with oil resistance and water resistance can be obtained. Furthermore, the vibrator of the present
invention is excellent in moisture resistance, high in wet strength, and high in dimensional
accuracy without expansion and contraction due to humidity.
Therefore, it has the advantage of not requiring moisture resistance treatment for improving the
wet strength of urea resin, melamine resin and the like. In this manner, it is possible to provide
an imaging moving body having high oil resistance and resistance to water penetration and high
industrial value. Furthermore, since a metal Sfl salt type dye or a derivative thereof or a metalcontaining derivative of a basic dye, or a mixed dye thereof is used as a coloring agent, a speaker
vibrator having extremely high light fastness can be obtained. Further, in the present invention,
since the coloring material is not colored in the paper making process, conventionally, raw
materials of different colors have been prepared in order to obtain vibrators having different
color tones. In contrast to the fact that everything has to be washed, in the present invention,
since the organic solvent soluble dye is used, the same stock can be used to color in the
impregnation step, and such washing is not necessary, so various methods can be used. It
becomes easy to obtain a moving body of color tone.
Brief description of the drawings
1 and 2 illustrate the steps of manufacturing the vibrator of the present invention, and FIG. 3 is a
graph showing the frequency characteristics after assembling the loudspeaker of the moving
body of the present invention and the conventional vibrator. Is a cross-sectional view of a
conventional electrodynamic speaker.