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Speaker diaphragms The contact points of the diaphragm fibers are mated by melting, solidifying
or solidifying the fibers themselves, or impregnated with a foam-like plastic paint that increases
in volume when heated. A speaker diaphragm made by drying, heating and pressure molding.
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
diaphragm. As speaker diaphragms, those made from softwood beaten pulp are generally used
because they have a moderate elastic modulus, a small mechanical loss coefficient, and a small
density, and they are loose. However, in the process of manufacturing this diaphragm, generation
of a large amount of dirty water containing fine fibers and a coloring agent for the diaphragm
causes reluctance to cause industrial pollution, and therefore the countermeasure is necessary.
Moreover, as materials based on artificially synthesized materials, glass fibers, carbon fibers, high
elasticity synthetic fibers (for example, short cut into foamable plastic, for example, styrene with
a foaming agent, acrylic, vinyl chloride, etc. ( Example: There is one in which an aromatic
polyamide) is added and molded into an imaging plate of a predetermined shape. This is because
the strength of the foamed plastic forming the diaphragm is extremely small and does not have a
sufficient function as the diaphragm, so fibers are added as a reinforcing material. Here, the fiber
added as a reinforcing material is short, and it is cut short in the process of molding, and since
there is no bond between fibers, a sufficient reinforcing effect can not be expected. Moreover, the
foaming agent added to the plastic molding material causes a foaming reaction at 150 ░ C. or
less below the molding temperature of the plastic mentioned above, and many can not be applied
to injection molding or extrusion molding, so rarely The addition of a foaming reaction control
agent makes the pressure and temperature control of the reaction suppression strict and
impractical for practical use, and it also becomes expensive and is not suitable for a low-
performance inexpensive structure such as a speaker diaphragm. Also, carbon fiber on the
surface of foamed plastic. EndPage: Some are intended to maintain an appropriate elastic
modulus by bonding a highly elastic thin fiber cloth made of glass fiber or the like or a thin metal
such as aluminum foil, titanium foil or the like. However, it is difficult to keep the layer of the
adhesive used for bonding the foamed plastic such as the core and the fiber cloth or metal foil of
the facing surface thin and uniform. In addition, cutting the core material to a predetermined size
thin and having a uniform thickness is problematic in the operation of the cutting and training
work, becomes expensive, and is difficult to put to practical use. The present invention provides a
speaker moving plate obtained by a simple method except for the above-mentioned drawbacks of
the prior art. In order to eliminate the above-mentioned disadvantages of the prior art, the
present invention maintains the mechanical modulus of elasticity and the like by the
configuration of the non-woven fabric serving as the core and the strength of the fibers, and the
foamed plastic is a shape-retaining material as an imaging plate. It has the function of
In addition, as a manufacturing method, among various non-woven fabrics that are commercially
available, integration of melting and solidification of the contact points of the fibers in the
entanglement of polyester fibers or aromatic polyamide fibers constituting the non-woven fabric
without adding a binder Selected from those bound to the core, and with coloring agent, viscosity
modifier, and heating, the blockage inside the balloon expands in proportion to the heating
temperature, and has a function to promote the volume increase of the balloon An impregnating
material in which foam fine particles are dispersed and suspended in an appropriate dispersion /
diluent is impregnated into a non-woven fabric, which is then dried and formed into a
predetermined shape by the mattide die method in the next forming step. In addition, in this
molding process, the diaphragm thickness is maintained by the addition of the foam fine
particles, unlike the diaphragm of a normal plate, a distance which is narrowed once into a
female mold and a male mold after the diaphragm is once made It is necessary to adjust to a
predetermined thickness, which is one of the features of the present invention. Hereinafter, a
speaker imaging plate according to the present invention will be described by way of examples.
Example 1 A fiber material is an aromatic polyamide, and a non-woven fabric containing no
binder and having a weight per unit area of 180 f / d and a thickness of 211 I + is used as a base
material. This includes 100 parts by weight of latex suspended in SBR water, 50 parts by weight
of an acrylonitrile balloon having a diameter of 10 to 50 ?m 1 and an average diameter of 15
?m of polyacrylonitrile blocked with butane gas inside, and suitable color selected according to
the purpose. One part by weight of the agent is placed in a dispersing agent prepared by mixing
50 parts by weight of industrial methyl alcohol with 450 parts by weight of ion-exchanged water,
which is stirred to suspend the above-mentioned latex, balloon and coloring agent. This is used as
an impregnating agent to impregnate the non-woven fabric through the following procedure.
Here, latex is added to the balloon because it can hardly be expected to adhere to fibers. In
addition to the latex, an acrylic resin or a polyurethane resin may be mixed, as long as the main
temperature above the molding temperature of the diaphragm is heated to adhere to the fiber. In
the impregnation of the non-woven fabric with the impregnating agent, the non-woven fabric is
dried by heating at a temperature of 110 ░ C. for 2 hours, immersed in a solution of the
impregnating agent, and the roll 1 shown in FIG. , 2 to uniformly and sufficiently impregnate the
non-woven fabric 3 with the impregnating agent. Here, although the roll 1 and the roll 2 have
different diameters and the same number of revolutions (therefore, the peripheral speeds are
different), the directions are opposite. As a result, a shearing force is applied to the non-woven
fabric 6 to promote the impregnation. The operation of this impregnation and squeezing with a
roll is repeated 2 to 5 times as appropriate depending on the thickness of the non-woven fabric
and the viscosity of the impregnating solution.
It is repeated four times in this embodiment. Subsequently, it is dried in circulating hot air at a
temperature of 60 to 80 ░ C. for 3 hours to obtain a prepreg plate of a moving plate. In FIG. 1, 4
is a non-woven fabric after being squeezed with a roll 1.2, 5 is a tray, and 6 is a dripping
impregnating agent. Subsequently, the mold is narrowed into a pair of male and female molds
shown in FIG. 2 and molded into a predetermined shape. First, the prepreg plate 8 obtained by
the apparatus shown in FIG. 1 is held between the male mold 9 and the female mold 10 and
preheated for several tens of seconds to maintain the temperature of the prepreg board
8EndPage: 2 at 70 to 80 ░ C. The male mold 9 or the female mold 10 is driven to crush the
prepreg plate 8 and hold it for 10 to 15 seconds. During this time, the temperature of the
prepreg plate 8 rises to 105 to 115 ░ C., and the expansion of the gas occluded in the balloon in
the impregnating agent confined in the prepreg occurs. Therefore, the drive-side mold, in this
case, the male mold 9 is driven to maintain the distance between the male mold 9 and the female
mold 10 at a predetermined dimension. The balloon is inflated, and the prepreg plate 8 is
expanded to the full distance between the male mold 9 and the female mold 10 to obtain a
diaphragm of a predetermined shape. The thickness of the diaphragm, that is, the distance
between the male mold 9 and the female mold 10 is appropriately determined depending on the
driving conditions of the speaker incorporating the diaphragm, but in this case, the thickness of
the non-woven fabric of the inner material of prepreg, in the impregnating agent It is needless to
say that the content of the balloon is affected. The change in thickness profile of the prepreg is
schematically shown according to the progress of the process as shown in FIG. First, a pressformed product 11 obtained by forming and sizing the prepreg 8 by sandwiching the prepreg 8
between a male and a female 9, is obtained. This is because the reaction of the acrylonitrile
balloon has not yet occurred during the temperature rise process, so its expansion is small. When
the temperature reaches a predetermined level, the male mold 9 is driven to maintain the
predetermined size between the male mold 9 and the female mold 10, and the prepreg 8 has a
shape following the mold as indicated by the swelling codes 12 and 16. , Become dimensions.
The density of the diaphragm obtained in this example is 0.90 f / i-, which is equivalent to that of
paper, the modulus of elasticity is 3.8 О 10 ? ? dyne / ?, 2-3 times that of corn paper, and Q
is that of corn paper which is 18 Therefore, the sound speed is 1.7 to 23 times, and the highresonance point has a small degree of sharpness like that of cone paper, so it can be used as
broad as cone paper. Moreover, there is no problem that touches on pollution control, and it can
be made by a simple process at the same price as corn paper. Example 2 The base material is a
non-woven fabric not containing a binder and having a fiber material of polyester, a basis weight
of 120 f / n / and a thickness of 1.6 WIm.
Into this, 10 parts by weight of SBR latex, 70 parts by weight of an acrylonitrile balloon and 1
part by weight of a colorant were suspended in 500 parts by weight of ion exchange water to
obtain an impregnating agent. In the same manner as in Example 1, the above non-woven fabric
was impregnated with an impregnating agent and dried to obtain a prepreg plate. Subsequently,
using the above-mentioned prepreg plate as a work, a diaphragm was produced in the same
manner as in Example 1. The obtained diaphragm had a thickness of t ?1 can of 8.5 r / cf 1 and
a modulus of 2.5 О 10 11 dyne / cd% Q of 25. Example 6 Fiber material is vinylidene chloride,
weight per unit area 100 t / W? The base material is a non-bonded non-woven fabric having a
thickness of 1.2 m. The above base material is impregnated with the same impregnating agent as
in Example 2. It dried and obtained the prepreg board. Using this as a work, a formed plate was
produced in the same manner as in Example 1. The thickness of the obtained diaphragm was
1.111 II, the elastic modulus was 2.6 О 10 'dyne / ci, and Q was 18. As described above, the
present invention uses the artificial material, maintains the mechanical internal loss
characteristic that is characteristic of the conventionally used paper cone, and maintains the
same level as the paper cone, plus the paper cone. The speaker diaphragm can be obtained 17 to
23 times the sound speed of the speaker.
4. Brief description of the drawings FIG. 1 is a principle view of an apparatus for impregnating a
substrate pressure impregnating agent of a speaker diaphragm according to the present
invention, FIG. 2 is a sectional view of a mold for forming a prepreg plate, FIG. The figure is a
schematic view schematically showing the cross-sectional shape of the prepreg plate work and
the change in size in the process of being sandwiched and formed in a forming die. 8 иии Prepreg
plate 9 иии Male type 10 иииииииииииииииииииии ? ? ::: l :: ? ? 4EndPage: ?
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