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JPS52132821

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DESCRIPTION JPS52132821
Description 1, title of the invention
Speaker diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel
diaphragm having excellent sound pressure frequency characteristics for use in a speaker.
Conventional diaphragms for loudspeakers include seed supply fibers, bast fibers M fibers,
natural fibers, natural cellulose fibers such as wood fibers, or synthetic resin 9 fibers based on
cell awards, carbon fibers, glass fibers, etc. And depending on the purpose of use] those which
have been suitably beaten and formed into a paper are used. In this case, sizing is generally
performed in order to increase the waterproofness of the paper and the adhesion between
cellulose fibers. As the raising agent generally used, rosin, silicate, aluminate, glue, rubber,
synthetic resin and the like are used, and in particular, zize treatment with rosin is common. In
general, when making a high-pitched M diaphragm, choose a sheet with relatively high elastic
modulus such as mimmata, manila hemp, softwood pulp, etc. that can easily obtain high-pitched
area reproduction, increase the beating degree, and molding conditions also high pressure Do
with On the other hand, in the case of diaphragms for low frequency range, in order to smooth
sound pressure frequency characteristics, molding conditions such as linters and the like which
are easy to obtain relatively large internal loss paper and low beating are used under no pressure
and low pressure molding conditions. Do with In general, a diaphragm having a high elastic
modulus has a small internal loss, and one having a large internal loss has a low elastic modulus,
and it is very difficult to change the composition of pulp, papermaking conditions and forming
conditions. Although the characteristics required for the diaphragm differ depending on the
purpose of use, it is important that the elastic modulus is appropriately high and the internal loss
is appropriate, and the output sound pressure level frequency characteristic is smooth EndPage:
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1
1. As a result of various investigations to increase the internal loss of the diaphragm with an
appropriate elastic modulus, as a sizing agent, a resin having a relatively large internal loss with a
small change from low temperature to room temperature is used in combination with the rosin
sizing agent or alone It has been found that, when used in the above, only the internal loss is
increased without decreasing the elastic modulus of the diaphragm. As the natural cellulose fiber
used in the present invention, a general seeding part, a bast part, a leaf fiber, and a wood cord 1
fiber used for a speaker diaphragm are used without any problem, and the required
characteristics of the diaphragm A suitable blending and refining condition is used. At this time,
it can be used without any problem even if it is blended with an appropriate amount of general
synthetic resin clamping part, carbon stem and glass fiber to cellulose fiber. As a resin used as
the sizing agent of the present invention, one or more types of resin selected from those having a
glass transition temperature ranging from low temperature (−20 to −60 ° C.) to high
temperature (20 to 110 ° C.) are blended. And copolymerization, block polymerization, and
graft polymerization.
As a polymerization method, emulsion polymerization, solution polymerization, bulk
polymerization and the like can be carried out, but in particular, those obtained by emulsion
polymerization are suitable for this purpose. Further, a resin obtained by solution polymerization
or bulk polymerization modified to be water soluble or one dispersed in water is also suitable. As
these resins, n-amyl acrylate), n-hexyl acrylate, n-butyl acrylate, rl-propyl acrylate, polyacrylate
obtained from ethyl acrylate, polybutadiene, polyisoprene, poly as relatively low glass transition
temperature are mentioned. A rubbery resin such as chloroprene is used. Polytertiary butyl
acrylate, n-butyl methacrylate, inbutyl methacrylate, tertiary butyl methacrylate, n-propyl
methacrylate, isopropyl methacrylate, ethyl methacrylate, methyl methacrylate as relatively high
glass transition temperatures And polymethacrylates, polyvinyl acetate, polystyrene and the like
are used. As an intermediate glass transition temperature, polymethyl acrylate, poly-n, -amyl
methacrylate, poly-n-hexyl methacrylate and the like can also be used in combination. In the case
of a copolymer, acrylic acid and methacrylic acid can be used in combination. Divinyl benzene
and ethylene glycol, recall, diethylene glycol, diacrylic acid ester such as yJ + 'lJ ethylene glycol,
dimethacrylic acid ester, and diacrylic acid ester such as propylene glycol and polypropylene
glycol, difunctional acrylic acid ester such as dimethacrylic acid ester, etc. Add in amount of t% or
less, co-electricity. It can also be done. In this case, the ratio of the ridge to the sizing agent is 7.0
to b, preferably 80 to 95 parts, and 5 to 20 parts. If the d sizing agent used is 2 parts or less, the
internal loss is increased. In the case of less than 30 parts, the density is high and the elastic
modulus is lowered. The processing method of the soot agent can be carried out in the same
manner as general rosin size. That is, the cellulose addiction is beaten to a predetermined degree
of beating t'c, the cellulose fiber alone is mixed with the other part and the sizing agent is added,
and the fixing agent of light pans and aluminum sulfate commonly used is added in the paper
machine Paper forming is performed in a cone shape. In such a case, the amount of the
dysentery, which can not be used together with the logic size, varies depending on the required
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characteristics of the diaphragm, and a diaphragm having various characteristics can be
obtained.
In the diaphragm of the present invention, although it is possible to obtain sufficiently
satisfactory characteristics in the cocoon layer, it is possible to have a gauze-layer structure in
which the blending of fibers and the amount of sizing agent are changed. Next, to the ?? Example
1? 1? Four flask showing the embodiment of the present invention, a cooler-crocker, a 9-element
gas introduction pipe, and a dropping rod are attached, water 60 "OgJ anionic surfactant The
apparatus was loaded with 8 g and placed in a 60 ° C. water bath for 30 minutes. Next, add 120
g of an aqueous solution in which the excess water strength ijtsg, hydrogen sulfite sodium Q, 59
EndPage: 2 is dissolved, and add methyl methacrylate (0.8 g of diethylene glycol dimethacrylate)
to a total of 100.9. Reaction was performed for 30 minutes after dripping in minutes. Next,
diethylene glycol dimethacrylate 29. An acrylic emulsion A was obtained by adding n-butyl
acrylate 300 / i containing 8 g of acrylic acid dropwise over 2 hours and then reacting for 3
hours. Add 600 g of water and 8 g of an anionic surfactant 5 to the same device for 30 minutes
in a 60 ° C. water bath? Then, 120 g of an aqueous solution in which 1.5 l of potassium
perborate and 0.5 g of sodium hydrogen hydrogen peroxide were dissolved was added,
diethylene glycol dimethacrylic acid) 2.59% methacrylic acid 7.5. A mixed solution of iil, 200 g of
ethyl acrylate and n-propyl methacrylate 1901 was added dropwise over 2 hours and then
reaction was performed for 3 hours to obtain an acrylic emulsion B. Next, 15 parts of emulsion B
was mixed with 15 parts of emulsion B to obtain a sizing agent having a solid content of 36%.
Next, add 70 parts of NTJKP with a water content of 450 Co and 22 parts of a linter with a
reactor water concentration of 600 cc to a concentration of 1.5%, add 8 parts of the sizing agent
obtained above as a solid, and stir well As post-fixing agent &, “IQ Ik aluminum was added and
sizing was performed. Thereafter, it was formed into a predetermined cone shape, and heatformed at a pressure of skg / crA for 1 minute at 180 ° C. to obtain a diaphragm. Example 2 50
parts of Nukap with a tear water degree of 450 cc, 25 parts of a mimuta with a reactor water
degree of 400 cc, and 13 parts of high grade carbon fibers (single yarn diameter 9 μ, fiber
length 3) water to a concentration of 1.5% In addition, 12 parts of a solid content of the sizing
agent obtained in Example 1 was added and stirred, and then aluminum oxalate as a fixing agent
was added for sizing treatment. Thereafter, it was formed into a predetermined cone shape, and
heat-formed at a temperature of 180 ° C. for 1 minute-65 at a pressure of 9 / crI to obtain a
diaphragm. Comparative Example Water is added so that concentration becomes 1.5%, and 22
parts of linters with 70 cc of water and 450 cc of water and 600 cc of furnace water are added,
solid part is added with 3 parts of rosin sizing agent and well stirred after fixing. Additional sizing
was performed.
Thereafter, it was formed into a predetermined cone shape, and heat-formed at a temperature of
180 ° C. and a pressure of 5 Icg / all for 1 minute to obtain a diaphragm. It is a figure which
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made a speaker with each diaphragm and measured the sound pressure frequency characteristic.
The curve 1 in the figure is obtained from the diaphragm of the comparative example, the curve
2 is obtained from the diaphragm of the example 1 of the present invention, and the curve 3 is a
curve obtained from the diaphragm of the example 2 of the present invention It is. As is apparent
from the figure, the diaphragm according to the present invention has a smooth sound pressure
frequency characteristic.
4. Simple illustration of the figure is a figure showing the sound pressure frequency
characteristic curve of the speaker (curves 2 and 3) using the diaphragm according to the
present invention and the loudspeaker (curve 1) using the conventional diaphragm. is there.
Agent Patent Attorney Shino Kuwano-=: 22; 2 駕 EndPage: 3
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