close

Вход

Забыли?

вход по аккаунту

?

JPS61245796

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS61245796
[0001]
TECHNICAL FIELD The present invention relates to a water repellent center cap used for a
speaker. BACKGROUND ART FIG. 1 is a cross-sectional view showing an example of an
electrodynamic speaker. In such a speaker, the pole piece 2 is mounted at the central portion of
the back plate 1, and the magnet 3 is mounted at the peripheral portion of the back plate 1. The
plate 4 is placed on the magnet 3 to form a magnetic gap with the pole piece 2. A voice coil
bobbin 6 carrying a voice coil 5 is vibratably inserted into the magnetic gap and supported by a
damper 7. The voice coil bobbin 6 is coupled to the central hole of the cone-shaped diaphragm 8,
and a center cap 9 is crowned in the vicinity of the central hole. The peripheral edge of the
opening of the diaphragm 8 is supported by the frame 11 via the edge 10. The etch 10 is further
secured to the frame 11 by a gasket 12. In the speaker, the center cap 9 was originally attached
for the purpose of dust prevention so as to prevent dust, dust, etc. from entering the magnetic
gap, but in recent speakers, particularly the high frequency range to expand its output frequency
band It is required to work as a diaphragm that takes charge of. For this reason, the performance
of the center cap as well as the diaphragm is that its mass is small and its Young's modulus is
large in order to improve the transient characteristics, efficiency and output sound pressure
frequency band of the speaker, and divided vibration is suppressed to output sound pressure A
large internal loss is required to flatten the frequency. Similar to the diaphragm, a center cap
mainly made of wood pulp fibers is widely used as a center cap which grooves these
requirements to some extent. In addition, a mixture of a valve fiber and a chemical fiber is often
used as a center cap. In recent years, as the use of speakers has been greatly expanded, speaker
vibrating members having various performances, that is, a diaphragm, a center cap, and a voice
coil bobbin have been required. For example, with regard to a speaker mounted on a vehicle, for
example, a speaker for vehicle door mounting, there is a demand for a speaker vibrating member
having water repellency and water resistance. Since many of the vibrating members are mainly
11-05-2019
1
made of pulp fibers, it has been conventionally attempted to apply a resin impregnation
treatment or the like to the vibrating member base material after paper making in order to
improve water repellency and water resistance. However, similar to the diaphragm, the
conventional resin-impregnated center cap has the disadvantages that the mass of the center cap
increases and the efficiency of the speaker decreases, the internal loss decreases, and the output
sound pressure frequency characteristics can not be flattened. there were.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a speaker
center cap having water resistance and water repellency. The center cap for speakers according
to the present invention is characterized in that it is made of a base material obtained by forming
natural fibers, chemical fibers or a mixture of these, and impregnating and drying a solution of
fluorochloro substituted derivative of hydrocarbon. EXAMPLES Examples of the present
invention will be described below based on the attached drawings and the following table. As a
first embodiment, a center cap is manufactured in the following steps. First, beat the NLI KP valve
with a beater to a degree SR of 20 degrees at a degree of shopper glaring (J15-P-8121). This
stock is dispersed in a paper making tank, and papermaking is performed with a papermaking
net formed in advance into a semicircular shape. The resulting paper is heated and pressure
dried to obtain a dome-shaped substrate. Next, a solution of fluorochloro substituted derivative of
hydrocarbon shown in Table 1 is prepared in advance. AG-640 shown in the table is a trade
name of a fluorochloro substituted derivative of hydrocarbon manufactured by Asahi Nikko Glass
Co., Ltd. Table 1 [1] The prepared substrate is dipped and impregnated in a solution of a
fluorochloro-substituted derivative of hydrocarbon. Next, drying is carried out for about 3 to 5
minutes with a hot air at about 100 ░ C. in a dryer after the impregnation treatment to adhere
the fluorochlorinated derivative of hydrocarbon to the fibers in the substrate. Thereafter,
predetermined inner and outer diameters of the obtained base material are cut and molded to
obtain the speaker center cap of the first embodiment. FIG. 2 is a partial enlarged cross-sectional
view of the speaker center cap of the first embodiment, showing that the fluorochloro substituted
derivative 22 of hydrocarbon is substantially filled in the space between the pulp fibers 21 and
adheres to the valve fibers. Show. Next, as a second embodiment, a center cap is manufactured in
the next step. First, a substrate is prepared in which a fluorochloro substituted derivative of
hydrocarbon adheres to i * a in the substrate obtained in the same process as in the first
embodiment. Next, a nitrocellulose resin solution of the components shown in Table 2 is
prepared in advance. The substrate to which the fluorochloro substituted derivative of
hydrocarbon is attached in the pre-impregnation treatment of Table 2 is immersed in the
nitrocellulose resin solution to attach the nitrocellulose resin solution to the surface of the
substrate. Also, regardless of immersion, the resin solution may be attached by spray coating.
Next, drying is performed for about 5 to 7 minutes with a hot air at about 100 ░ C. in a drier to
cure the nitrocellulose and coat the surface of the substrate with a nitrocellulose resin film.
Further, the coated substrate is again immersed in a solution of a fluorochloro-substituted
derivative of hydrocarbon shown in Table 1 to deposit the derivative solution on the surface.
11-05-2019
2
Next, drying is performed for about 3 to 5 minutes with a hot air at about 100 ░ C. in a drier to
deposit a film of a fluorochloro substituted derivative of hydrocarbon on the main surface of the
substrate. Finally, predetermined inner and outer diameters of the substrate obtained through
these steps are cut and molded to obtain the speaker center cap of the second embodiment. FIG.
3 is a partially enlarged cross-sectional view of the speaker center cap of the second
embodiment, in which a nitrocellulose resin 1123 and fluorochlor substituted on a base
independent surface comprising a pulp fiber 121 to which a fluorochloro substituted derivative
22 of hydrocarbon is attached. It shows that the dielectric films 24 are stacked in order. Next, a
center cap is manufactured in the same process as the second embodiment as the third
embodiment. However, instead of the nitrocellulose resin solution for forming the nitrocellulose
resin film, the surface of the base material to which the fluorochloro substituted derivative of
hydrocarbon is attached is prepared in advance using an acrylic resin solution of the components
shown in Table 3. Here, A-No 3 (trade name) manufactured by Nippon Kayaku Co., Ltd., which is
an acrylic resin, is used. Table 3 Figure 4 is a partial enlarged cross-sectional view of the speaker
center cap of the third embodiment, wherein an acrylic resin film is formed on the base surface
of the valve fiber 21 to which the fluorochloro substituted derivative 22 of hydrocarbon is
attached. 25 shows that a fluorochloro substituted derivative 1124 is laminated in order. Table 4
shows the physical properties of each of the speaker center caps of the first, second and third
examples and the speaker center cap made only of the conventional paper-making. The center
cap of the first example of Table 4 shows the physical property values substantially the same as
those of the base material, but according to JIS-P-8137 ?Test method of water repellency of
paper and paper board?, for example, excellent R8-R9 It can confirm that it has water
repellency. Also in the center cap of the second embodiment, it is understood that the Young's
modulus is improved while maintaining the density compared to the base material. Moreover, it
can confirm that it has the outstanding water repellency by the water repellency test method
similarly to 1st Example. It is also understood that the Young's modulus of the center cap of the
third embodiment is greatly improved while maintaining the density and internal loss as
compared with the base material. Moreover, it can confirm that it has the outstanding water
repellency by the water repellency test method similarly to 1st Example. Furthermore, the center
cap of the third embodiment becomes a center cap with improved waterproofness and water
resistance due to the presence of the acrylic resin film, and deformation of the center cap occurs
even after being left under an environment of 45 ░ C. and 95% RH for 48 hours. No change was
observed even after standing in water at 20 ░ C. for 24 hours.
Freon (trade name: E, 1. du Pont de Nemours & C0, 1nc, manufactured) is known as a
fluorochloro substituted derivative of hydrocarbon. Freon includes, for example, freon 11
(CC13F), freon 12 (CC12F2), freon 22 (CHClF2), freon 113 (CG12F-CGIF2), freon 114 (CCIFCG12F) and the like. These are also used in the production of fluorinated resins, and polymers
11-05-2019
3
which are derivatives are obtained by suspension polymerization or emulsion polymerization
under the catalyst of peroxide or sodium sulfite. For example, there are the following as a
polymer. Ethylene tetrafluoride polymer ..... (CF2CF2) n Tetrafluoride ethylene hexafluoride
propylene copolymer (CF 2 CF 2 CF 2 CF 2 CF 2 CF 2). CF3 Trifluorinated Chlorinated Ethylene
Polymer иииииии (CF2 (, CIF)). Vinylidene fluoride ethylene polymer ..... (CF20 H2) n Vinyl fluoride
polymer ..... (CHFCH2). The critical surface tension of these freon derived polymers, ie,
fluorochloro substituted derivatives of hydrocarbons, is extremely small. For example, the critical
surface tension of the derivative polymer is 18 dyne / C1l while polyethylene Get 31 dyne / cm,
polystyrene has a critical surface tension of 33 to 43 dyne / C1 polyamide and 42 to 46 dyne /
cm. In order for the liquid to wet the solid surface, it must be smaller than this critical surface
tension value. However, the surface tension of water, which is a problem in the present invention,
is 72 ░ 75 dyne / cm (20 ░ C.), which indicates that the fluorochloro substituted derivative
polymer of hydrocarbon imparts excellent waterproofness to the substrate. I understand. In
addition, the adhesion amount of the derivative polymer required to impart this waterproofness
may be 0.1% to 1.0%, preferably 0.5% to 0.8%. Thus, the amount of adhesion of the fluorochlorosubstituted derivative polymer of hydrocarbon is small, so that the physical property value
inherent to the substrate is not impaired at all. The bond dissociation energy of the C?F bond of
the fluorochloro-substituted derivative polymer of hydrocarbon is 107 kal / ?01, for example,
compared to the dissociation energy 1Q 3 kal / 1dol of the C?H bond of a resin represented by
paraffin large. This means that it is also thermally stable. In fact, freon derived polymers can be
used in the range of 50 ░ C to + 150 ░ C.
In the second and third embodiments, an intermediate coating of acrylic resin and nitrocellulose
is provided, but in addition to these substances, an intermediate coating of an organic polymer
soluble in another organic solvent may be provided. Moreover, although a film is laminated |
stacked on base material both sides in each Example, the center cap which maintained water
repellency is obtained also by lamination | stacking of the film of only one side. Effects of the
Invention As described above, according to the present invention, since the surface of the
substrate fiber is strongly covered by the blocking effect of the fluorochloro substituted
derivative of hydrocarbon, excellent water repellency to prevent the permeation of water The
center cap which it has is obtained. Further, since the penetration of water is prevented, the outer
shape of the center cap is not deformed, and the center cap which does not give deformation to
the imaging plate via the bonding portion with the diaphragm can be obtained. In addition, a
center cap having water resistance and maintaining Young's modulus and internal loss can be
obtained.
[0002]
Brief description of the drawings
11-05-2019
4
[0003]
FIG. 1 is a cross-sectional view of an electrodynamic speaker, and FIGS. 2, 3 and 4 are partial
enlarged cross-sectional views of a speaker center cap according to the present invention.
Explanation of symbols of main parts 1 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
иииииииииииииииииииииииииииииииииииииии5
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ? 21 ииииииии Valve fiber
11-05-2019
5
Документ
Категория
Без категории
Просмотров
0
Размер файла
15 Кб
Теги
jps61245796
1/--страниц
Пожаловаться на содержимое документа