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JPS5262426

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DESCRIPTION JPS5262426
2, inventor 1 town ? ? ? 385 385 385 231 385 231 385 ? 385 ? ? ? ? ? ? 385 385
385 385 385 ? ? ? 26 26 ? ? ? ?. (1977) 5.2364-6555, Specification 1, Title of the
Invention
Speaker diaphragm
3. Detailed description of the invention The present invention uses a high elastic modulus
papermaking paper impregnated with a resin that exhibits a sound pressure frequency,
particularly a relatively large internal loss, used for a speaker, The present invention relates to a
novel diaphragm having a three-layer structure formed by heat and pressure molding.
Conventional diaphragms are synthetic fibers based on plant fibers such as seed fibers, body skin
fibers, elemental fibers, wood fibers, etc. or vegetable fibers, and they are added with fibers, glass
fibers, etc., depending on the purpose of use. Are used for papermaking and molding. In general,
when making a diaphragm for high-pitched area, select fibers with high elastic modulus such as
Mitsumata, Manila hemp, softwood valves, etc. to increase the degree of beating and swell and
fibrillate the fibers to increase the surface area of the fibers. In addition to increasing the bonding
area between fibers, the entanglement between fibers is increased and molding is also performed
under high pressure. On the other hand, in the case of producing a diaphragm for the low
frequency range, the low elasticity modulus of fibers such as linter and the low repulsion degree
fibers are used to reduce the entanglement between the fibers and perform molding under no
pressure and low pressure. The characteristics of the diaphragm vary greatly with its elastic
modulus and internal loss. Generally, a diaphragm having a high elastic modulus has a small
internal loss, and one having a large internal loss has a low elastic modulus. Although the
characteristics required for the diaphragm vary depending on the purpose of use, it is important
to smooth the output sound pressure level frequency characteristics with an appropriate elastic
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modulus and an appropriate external loss. In order to achieve this purpose, a multi-layered
structure in which low elastic modulus material and high elastic modulus material are alternately
laminated is considered to be good. The improvement of internal loss is the same as the
improvement of is recognized in winter, and as a result of various examinations, the present
invention ij j and jz can be achieved. Papers to be used in the present invention are those
obtained by refining a low elastic modulus fiber such as linters alone, ? scum, flax, cannabis,
shimmy, mitsuta, scum fibers such as kozo, etc., collection fibers such as manila hemp, softwood,
Hardwood or other lumber fibers such as hardwoods may be made into paper or not, or may be
made so that the path length between fibers becomes small even after beating! J7.7: Mixed lowelastic modulus 0 As a limp, synthetic fibers such as rayon, tetron, nylon, acetate, etc. were made
into paper and treated as a binder with a relatively low-elasticity resin. The amount of the binder
and the amount of binder are small, and those formed into a felt shape are used. For high elastic
modulus paper making, such as kapok seed 1if! Male, flax, mitsumata, kozo and other mu
delicate, Manila hemp and other fibers (3) fiber, conifers and other wood # I!
Papers that have been made so as to have a high modulus of elasticity and high degree of
elasticity by using vegetable fibers with high fiber content, or those obtained by mixing carbon
fibers or synthetic fibers with high elastic modulus based on plant fibers As a resin to be used for
impregnating low elastic modulus papermaking paper or non-woven paper, a resin having a glass
transition temperature in the range of low temperature (?20 to ?50 ░ C.) and room
temperature (10 to 40 ░ C.) Copolymerization, block polymerization, graft polymer can be
obtained by methods such as emulsion polymerization, solution polymerization, bulk
polymerization and the like. . Among these resins, butyl acrylate, glutamic acid acrylate,
polyacrylate obtained by the present invention, polyether obtained from polydimethylene,
ethylene oxide, propylene oxide, etc., polybutadiene, polyisoprene, polyisoprene, etc. as having a
relatively low glass transition temperature. And rubber such as polychromatic gastric prene are
used. As relatively high glass transition temperature, polyacrylates of tertiary retyl acrylate-1 (4),
buty methacrylate, propyl methacrylate, ethyl methacrylate, poly methacrylate such as methyl
methacrylate, polyvinyl acetate, etc. Polyvinyl butyral, various types of poly, ester, polyamide and
the like are used. Polycyanoethyl acrylate, polymethyl acrylate, ethyl acetate, etc. are used as the
glass transition temperature is intermediate. A copolymer and, in the case, acrylic acid and
methacrylic acid can also be used in combination. Commonly used plasticizers such as dibutyl
phthalate and dibutyl phthalate can be added to these resins in a small amount and used. In the
case of impregnating these 5 resins 1, it is possible to apply 6 by various methods such as
coating by a spray gun, coating by brushing, coating by immersion, and the like. In this case, the
ratio of the resin to the papermaking paper or the illicit cloth is from 5 to 70% by weight,
preferably from 10 to 50% by weight. When the proportion of resin is 5% by weight, in the
following cases, the resin impregnation is less, in the case of 70% by weight or more, in the case
of Young's modulus decreases, or the increase in density (5) is large. This is not preferable
because the reproduction efficiency of the sound decreases. First, a method of forming a
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diaphragm having a three-layer structure is as follows. A low modulus elastic paper or nonwoven fabric is formed into a cone shape, and if necessary, an inder is placed and combined, and
then dried, impregnated with resin and dried. Next, high ?, a blowfish rate i is formed into a
cone by ?, and it is t- state, or is superimposed on both sides of a low elastic modulus cone
paper impregnated with resin in a pressure-dried state, heating and pressing It is molded to have
a three-layer structure. , Low modulus resin impregnation 1.
The weight ratio of the ratio of the papermaking bottle 1 to the paper making of high elastic
modulus is 1): 0.5 to 3! The diaphragm having different characteristics can be obtained by
changing the dividing gate depending on the use and purpose of the diaphragm. The following
shows the cold treatment of the present invention. Example. aoocc 4 ro fro ro: lJ / c cooler,
crockery machine, ииии Nitrogen gas introduction, tube 1, dripping funnel xR screw 1 water 140 CC
и, 2 g of surfactant e, o'a The atmosphere was replaced with nitrogen gas for 30 minutes in a hot
water bath. Next, 5 g of an aqueous solution containing S, O, 0, 15 g and N H 80, 0, 50 g
dissolved in (6) EndPage: 2 added with 20 g of ethyl methacrylate containing 0.2 g of ethylene
glycol dimethacrylate Was added dropwise over 10 minutes, and the reaction was allowed to
proceed for 1 hour 9. Next to! ????????????????? 5 cc of an aqueous solution
in which 0.05 g was dissolved was added, and 80 g of n-butyl acrylate-) containing 0.5 g of
ethylene glycol dimetaacrylate-) was added dropwise over 30 minutes and reacted for 4 hours to
form an acrylic emulsion A. Next, an aqueous solution containing 140 CC of water, 2 g of
surfactant and nitrogen gas substitution for 30 minutes on a 60 'C water bath in the same
apparatus for 30 minutes to dissolve K, S, 0.0.3 g and NaH 3 O, 0.1 g IQcc! Then, 100 g of
ethylene glycol; methyl acrylate containing 0.7 g of methyl acrylate) was added dropwise over 30
minutes and allowed to react for 4 hours to form an acrylic emulsion B. Next, 810 parts of the
emulsion was mixed with the following Niemarchin Aeol K to obtain an impregnating emulsion
having a solid content of about 40%. Sized with a sizing agent 700CC free water NUCP (7) 20
high water freeness' 700 cc dimeta 80% formulation for test paper machine 4g (absolute weight)
so that 1 h bore diameter The sheet was formed into a cone shape, and a mold heated to 180 ░
C. was used to form a number of three at a pressure of 2 to 2 / ? 2. Next, the corn paper is
dipped in an acrylic emulsion, taken out and dried at 50 ░ C. for 2 hours to obtain a coneshaped resin-impregnated paper having a resin content of 40% by weight. Next, it was tested
with a formulation of sizing agent NUCP 6 ON with a freeness of 400 CC, 30% of Mimmata with a
freeness of 300 CC, and 10% of carbon fiber (Cottles's single yarn diameter 9?, high-strength
carbon fiber with a length of 6) The paper was machined and dewatered into a cone of 18 subdiameters so that one sheet became 3 g (absolute dry weight) with a paper machine for sheet
use. This paper-making paper is superimposed on both sides of a cone-shaped resin-impregnated
paper, and a die pressure heated to 180 'C is a pressure of 5 Kg / cn?
Thus, a diaphragm having a three-layered structure with five intermediate forming and drying
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grooves was obtained. Comparative Examples Sizing agent treated with sizing agent NtJKP 8%
with freeness 600CC, Dimeta 32% with freeness 700CC, Mitsumata 18% with freeness 3000C,
'carbon fiber (Example and (8) same) mixed with 6N ( The same composition as in the example) A
sheet of paper with a diameter of 18 m was used to make one sheet of 11.5 g (absolute dry
weight) with a paper machine for test, and the pressure was 5 kg / cm with a gold bottle heated
to 180 ░ C. An intermediate plate was formed at 3 cm "to obtain a diaphragm. In the figure, a
speaker is manufactured with each diaphragm and the sound pressure frequency characteristics
are measured. Curve (1) in the figure is obtained from the diaphragm of the comparative
example, and curve (2) is a curve obtained from the diaphragm of the present invention. As
apparent from the figure, it can be seen that the diaphragm according to the present invention is
smooth in sound pressure frequency characteristics. When the proportion of paper making with
high modulus of elasticity is increased with respect to resin impregnated paper with low modulus
of elasticity, the curve (2) in the figure extends to the high range, and when the proportion of
paper making with high modulus of elasticity decreases Although the limit is lowered, the sound
pressure frequency characteristics become smoother. The same change occurs by changing the
proportion of the resin component of the low elastic modulus resin impregnated paper. By
changing the ratio of the resin component of the low elastic modulus resin-impregnated paper or
the ratio of the low elastic modulus resin-impregnated layer and the high elastic modulus layer
(9), the high sound reproduction limit can be adjusted, and the sound pressure frequency A
smooth diaphragm of characteristics can be obtained.
4. Simple illustration of the figure is a diagram showing the sound pressure characteristic line of
the speaker [curve (2)] using the diaphragm according to the present invention and the speaker
[curve (1)] using the conventional diaphragm is there. Agent Shino Nobu-(10) EndPage: 3 ? 5 ?
2 'and 4 4 6 Inventors other than the above (1) Inventor Mitsubishi Electric Co., Ltd. Ingenuity
Technology Research Institute Name Coter's Corez ? Kodama-EndPage: ?
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