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JPS5275428

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DESCRIPTION JPS5275428
1 、 Diagram of the invention
2, the scope of claims
The present invention relates to a speaker diaphragm. The conventional diaphragm is made of a
plant fiber such as a wood norpup or a synthetic fiber, a carbon fiber or the like based on a plant
fiber and appropriately beaten according to the purpose of use to form a sheet. Generally, in
order to extend the high sound reproduction limit, the freeness of wood pulp is increased to swell
the fibers and fibrillate to increase the surface area of the fibers, to increase the bonding area
between the fibers and to increase the entanglement between the fibers. And molding is also
carried out at high pressure. However, in the case of a diaphragm made of wood pulp alone or
mixed with synthetic fiber and carbon fiber, a high elastic modulus one can not be obtained, so
that the high sound reproduction limit does not extend much. On the other hand, a composite
material in which a synthetic resin is reinforced with glass fiber or the like has a higher elastic
modulus than paper or the like, and is used for various applications, but the thickness of a
generally used reinforced composite material is Since it is 0.5 m or more and is not of uniform
thickness, it does not satisfy the requirements for the middle and high range diaphragms
(uniform with a thickness of 05 to 02). Investigate the method of impregnating resin into mixed
sheet with inorganic phosphorus / zH · grand scale-like material represented by non-directional
glass fiber soot etc. and obtaining a uniform thin diaphragm. The resin content is 50 to 80% by
weight in the state of a prepreg, and after EndPage 1 including resin, it varies depending on the
type of resin, but at a pressure of 10 to 200 kp / CI / l at a temperature of 14σ to 200C. When
molding was performed under conditions where the mold speed was slowed, we found that a
diaphragm with a favorable appearance could be obtained. The diaphragm thus obtained has an
appropriate internal loss due to the interaction between the glass fiber and the resin and a high
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elastic modulus due to the inorganic flaky material (the flaky material being filled between the
glass fibers and further with the glass fiber Due to the interaction between the flaky material and
the resin, the elastic modulus becomes higher than that of ib glass fiber alone), so that the high
sound reproduction limit is high, and a smooth sound pressure frequency characteristic is
obtained.
2, the scope of claims
Hereinafter, the present invention will be described in detail. As the glass fibers used in the
present invention, ordinary low alkali glass fibers and high tensile strength glass fibers having a
single yarn diameter in the range of 3 to 1511 are used. When the length is too short, the effect
of improving the elastic modulus is small, and when it is too long, the dispersibility at the time of
paper making is poor and it is difficult to obtain a uniform one. Untreated glass fibers may be
used, or those having a surface treatment to improve the bonding state with the resin are
preferably used. 1'j-Among the inorganic flakes used in the present invention, natural mica and
synthetic mica such as muscovite, soda mica, phlogopite and biotite are used without any
problem. In this case, not only mica but also other inorganic flakes such as glass flakes can be
used as well. If the average diameter of the flaky material is too small, it is difficult to form after
forming and impregnating with a resin, and if it is too thick, the dispersibility is poor and uniform
thin sheets are difficult to produce, so the range of 30 to 300 μ is preferable. The mixed sheet of
glass fiber and flaky material is used in a glass fiber content of 30 to 100% by weight. When the
proportion of glass fiber is 30% by weight or less, the density of the molded product is increased,
and the internal loss is unfavorably reduced. When the proportion of glass fiber is large, a large
internal loss is obtained, and when it is small, a high elastic modulus is obtained, and it is used at
an appropriate ratio according to the required fiber of the diaphragm. As the resin used in the
present invention, it is preferable to have a resin having the largest internal loss as compared
with the elastic modulus. Furthermore, it is preferable to have good fluidity at the time of
molding and quick curing, and to have a high deformation temperature of the resin itself when
taking out the molded article at the curing temperature. As such a resin, a thermosetting resin
such as a urethane resin, an acrylic resin, a diallyl phthalate resin, or an epoxy resin which is
usually commercially available is preferable. The mixed sheet of glass fiber and inorganic flakes
is impregnated with a resin, and the proportion of the resin is used in the range of 50 to 80% by
weight. If the proportion of the resin is less than 50 parts by weight, the prepreg has no
seasonality, is easily damaged during molding, and tends to form a whit on a molded product.
When the proportion of the resin is 80 or more, it is not preferable that the resin is molded at the
time of molding and many cracks occur at the time of molding and the moldability deteriorates.
Prepregs made under these conditions are placed in a mold and subjected to heat and pressure
molding under the conditions described above, excess resin will flow out and the elastic modulus
is high, and a diaphragm with suitable internal loss can be obtained .
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Next, examples of the present invention will be shown. Example 1 10 g of high tensile strength
glass fiber having a single fiber diameter of 9 μ and a length of 121 is dispersed in 5 t of water
with a mixer and then placed in a test paper machine having a diameter of 15 crn and formed
into 10 wt% 0.5. ! i + (5 weight of glass fiber) was applied and dried at 50 C for 1 hour to obtain
a sheet made of paper. Next, a liquid epoxy resin (Epikote 828-100 parts of bisphenol A epoxy
resin manufactured by Shell Co., 24 parts of Inphorone diamine) is dropped onto the sheet made
of paper, and the excess resin is removed by a rubber roller, and the resin content is 70% by
weight I got a gu in my prep. The prepreg was placed in a dome mold and molded at a
temperature of 1607: for 25 minutes at a pressure of 100 ky / ctl to obtain a Dow EndPage: dualarm diaphragm having a diameter of 5.5 cWI. [Example 7] A high tensile glass fiber 0449 having
a single yarn diameter of 9 u and a length of 6 m and 0.7 g of a synthetic mica powder having an
average diameter of 800 μ were formed into a sheet and dried in the same manner as in
Example 1 to obtain a mixed sheet. The mixed sheet is immersed in a resin solution or 30% by
weight of a diallyl phthalate resin (80 parts of diallyl phthalate prepolymer, 50 parts of diallyl
phthalate monomer, dicumylo (20 parts of dioxide) acetone solution, and then dried at 60 C for 1
hour. There was obtained a 60% by weight prepreg. Next, the prepreg was placed in a dome mold
and was molded at a temperature of 170 C for 20 minutes at a pressure of 70 kl I / d to obtain a
dome diaphragm having a diameter of 5.5 crn. [Example Example] A high tensile glass fiber 0.79
having a single yarn diameter of 9 u and a length of 3 m and a synthetic microphone powder
0.359 having an average diameter of 200 μ were formed into a sheet and dried in the same
manner as in Example 1 to obtain a mixed sheet. . The mixed sheet is immersed and impregnated
in an acetone solution containing 30% by weight of epoxy resin (100 parts of Bisphenol A type
epoxy resin manufactured by Epicoat 828 NIJI, Blj, monoethylamine complex salt), and dried at
50 C for 1 hour The resulting prepreg was molded at a temperature of 1700 and a pressure of 5
Qkp / c <50 ° for 50 minutes to obtain a dome-shaped diaphragm having a diameter of 5.5 crn.
Next, let us compare the characteristics of the conventional diaphragm and the embodiment of
the present invention. The figure shows sound pressure frequency characteristics, the horizontal
axis shows frequency (H2) and the vertical axis shows sound pressure level (dB). In the figure,
curve t1 is obtained by making a diaphragm of the same shape from a softwood kraft valve and
attached to a speaker, curve t2 is obtained according to Example 1 of the present invention, and
curve t3 is obtained according to Example 2 of the present invention. It was obtained.
As apparent from this figure, it is clear that the embodiment of the present invention is superior
in high-pitched sound reproduction capability to the conventional example. Moreover, the thing
of Example 2 is better than Example 1, and congratulations. The diaphragm of the third
embodiment is almost the same as the curve t3. According to the present invention as described
above, it has been possible to provide a nuihi: force diaphragm having excellent reproduction
ability from the middle range to the high range.
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4 is a diagram for explaining the comparison between the conventional diaphragm and the
diaphragm according to the embodiment of the present invention. Agent Shino Shin-For Ki Zero
EndPage: 37, @ Inventor outside the wind (1) inventor Amuri Su Kiminami Shizuka Nakano
address Shinozaki City South Sakai water Nakanoza O Address February 25, 1959 Japan Patent
Office Secretary 1, Japanese Patent Application No. 50-152081 for displaying an event, a
diaphragm 2 for a speaker according to the invention, a diaphragm 3 for a speaker according to
an invention, a person 5 for correction, an object for correction
2, the scope of claims
In column 6 of the detailed description of the invention of the specification, the contents of
correction (1) “glass fiber” in page 2 line 16 of the specification is changed to “glass fiber
and mica”. (“Specification”, page 4, line 12, “30 to 300 μ” is amended to 130 to 3000 μ
”). EndPage or more: 4
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