JPS62241498

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DESCRIPTION JPS62241498
[0001]
The present invention relates to a speaker diaphragm and a method of manufacturing the
diaphragm, and in particular, has high elasticity and high strength. The heat resistance is
excellent, of course, there is little distortion, and the piston motion (i7 area can be expanded, and
a diaphragm suitable for woofers and a diaphragm that can be optimally manufactured simply
and accurately. It is about (Conventional Jk technology) Although pulp cones and resin cones are
used in conventional speaker diaphragms, these diaphragms generally have insufficient rigidity
and have disadvantages such as low heat resistance. Moreover, in order to eliminate the defect of
the pulp cone mentioned I- and to raise the rigidity of a diaphragm, the diaphragm which formed
the synthetic resin layer on the surface of group 7Ii by carbon fiber is also proposed. (Problems
to be solved by the invention) [1: in the case of the conventional carbon fiber described, in the
case of the diaphragm, pinholes, voids or streaks (map-like flow lines) g of the surface resin layer
g And there is no surface stability, and the strength tends to be uneven. In particular, if there is a
pin hole (resin removal), air load is less likely to occur, which causes third-order distortion.
Further, the diaphragm having the carbon fiber m layer on the surface is excellent in the rigidity
f1, but the internal loss is small, and the peak of the crystal region is generated. The object of the
present invention is to provide high elasticity, high strength, uniform internal loss equally,
excellent in weather resistance and heat resistance, as well as having surface stability and less
distortion, ++ r It is an object of the present invention to provide a speaker diaphragm having a
wide band and a smooth characteristic and a method of manufacturing the same. The speaker
diaphragm according to the present invention is provided with a back cloth layer of glass me on
at least the surface side of the diaphragm base by the honeycomb core and the same. A fiber
layer of high elasticity M & miscellaneous is provided on L, and a film layer is formed of acetate
cellulose on the surface of the fiber layer. The fiber layer to be provided on the back side may be
a high elastic fiber different from the fiber layer to be provided on the front side, and a paper
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quality layer may be provided on the back side of the diaphragm substrate to form the paper
quality layer. It is also possible to form a film layer of acetate cellulose on the surface of. The
method for manufacturing a diaphragm for a speaker according to the present invention
comprises temporarily bonding a glass fiber cloth backing material of fine cloth and a high
elastic fiber such as carbon fiber in a cone shape, and this and a diaphragm base material with a
honeycomb core The main body is cured with a thermosetting resin such as an epoxy resin
impregnated in the woven fabric by combining and heating and pressing it to obtain a structure,
and this structure is coated with an acetate cellulose solution 4j lll1.
Heat and pressure molding is performed with a mold to obtain a diaphragm. (Operation) The
speaker diaphragm according to the present invention has a structure of a honeycomb base plate
made of a diaphragm base, a backing layer of glass fiber cloth, and a fiber layer of high elastic
fiber, and has high elasticity and high rigidity. The fiber layer has a moderate internal loss due to
the presence of glass fiber cloth punching material, and the fiber, Ill! Since a film layer of acetate
cellulose is formed on the surface of the film, it has surface stability as well as weather
resistance, heat resistance and solvent resistance, and air load is apt to be applied by pinholes
and voids 5 There is no third distortion associated with this. We first formed a fiber layer of high
elasticity fiber on the surface of the diaphragm base material with a honeycomb core and formed
an acetate layer on the surface thereof to form defects such as pinholes and boiling of the fiber
layer. In this case, it is proposed that the diaphragm made of acetate cellulose is transparent, and
that the pinhole of the cloth is transparent. In addition, although there was a possibility that the
non-uniformity of the mechanical strength as a structure may arise, these defects can also be
eliminated in the present invention. In the speaker diaphragm according to the present invention,
a backing material of glass fiber cloth and a high elastic fiber such as carbon fiber), L: 4 j are
temporarily put on a surface of the diaphragm S with a honeycomb core. The solution is placed in
1 '% i 4 t l, and heat and pressure is applied to the vibrating plate molding die. By a
thermosetting resin such as epoxy resin impregnated in t'a M &, the honeycomb core and the
base 4 j of high elastic fiber provided with the backing material layer can be exactly adhered to
obtain a structure by these. . Since this structure has a backing layer of glass fiber cloth inside, it
has appropriate internal loss. Further, "-2" acetated cellulose is formed on the outermost layer by
heat and pressure and is fused to the highly elastic M & fiber base 1i. The film of this acetate
cellulose does not stick to the mold and is excellent in releasability, so the moldability is
extremely good, and there are no pinholes etc. Fiber I! 1 L of base cloth surface! It is also
effective for the I quality, and it is excellent in weather resistance, heat resistance and solvent
resistance, and pinholes and the like of the base fabric become invisible due to the presence of
the backing material of the glass fiber cloth. An embodiment of a speaker diaphragm according
to the present invention will be described together with a method of manufacturing the speaker
diaphragm based on FIGS. 1 to 4. FIG. 1 is a cross-sectional view of a cone diaphragm and FIG. 1.
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Fig. 3 is a cross-sectional view of another example of the configuration, Fig. 3 is a cross-sectional
view of another example of the configuration, and Fig. 4 is a plan view of the arrangement of ·
direction 1 '+ 1 elastic. . In the figure, reference numeral 1 denotes a cone diaphragm, which is
formed of a diaphragm substrate 2 by a honeycomb core, a backing material layer 3 of glass
fiber cloth disposed on at least the surface side of the diaphragm substrate 2, and part 1- It
comprises a fiber layer 4 of the high elasticity fiber and a film layer 5 of acetate cellulose formed
on the surface of the fiber layer 4. FIG. 1 shows an example in which the backing material layer 3
with high glass fiber cloth, high elastic fiber layer 4 and the fill layer 5 are formed only on the
surface side of the cone diaphragm 2 and FIG. 2 shows the diaphragm An example is shown in
FIG. 3 in which a high elastic P1 fiber layer 4 is formed directly on the back side of the No. 2
material, and J (in FIG. An example is shown in which the M & 層 layer 6 different from the fiber
layer 4 on the foot surface side is sunk and the film layer 5 of acetate cellulose is formed on the
surface. : AJJ in the fSZ diagram, the fiber layer 4 on the back side in the example may be made
to be a paper layer or the same as the fiber on the front side, or it may be a woven or non-woven
fabric with other high elasticity fibers different from this In any case, the above-mentioned film
layer 5 is formed on the surface of the film because pinholes are easily formed. In the figure, 9 is
an edge member. Next, a manufacturing example of a cone diaphragm will be described. First of
all, a thin glass fiber cloth is molded into a cone shape by a mold of self-hair at room
temperature, and then a one-sided prepreg of tooth fiber impregnated with an epoxy resin of 130
° C. for 1 hour type is shown in FIG. As shown in ˜ 4D, the glass fiber cloth is divided into four
along a cone shape and brought close to 1-of the glass fiber cloth placed on the mold, and heated
and pressurized at 50 to 60 ° C for 2 to 3 minutes --- Bias the direction prepreg. The material
thus obtained is placed on a paper honeycomb core and heated and pressurized at a temperature
of 130 ° C. for 1 hour by an autoclave method or a compression method, using a blood pressure
of 0.1 to 3 kg / arm '. In this case, the acetate cellulose solution is evenly coated in advance in a
die on the surface side of the diaphragm molding die. When a layer is formed on the surface of
the honeycomb core, the end part is a line contact R, but 1; a portion where the prepreg itself is
not in conflict with the glass fiber cloth by obtaining about 1% of the heating oil Hami as
described. 1-M epoxy resin melts and adheres properly to the honeycomb core to obtain an ideal
structure, and a film layer 5 of acetate cellulose is formed on the outermost layer.
In this case, since the resin does not penetrate the backing material by the glass fiber cloth, the
resin flows uniformly and uniformly in the surface high elastic fiber layer, and it is possible to
form a reinforced fiber plastic layer which does not generate pin pole, poled or stripes. it can. In
addition, the presence of the backing material of the 1-glass fiber cloth increases the internal loss
and has a good composite effect as well as the rigidity of the high elastic fiber. The backing
material layer 3, the fiber layer 4 and the film layer 5 were formed on the back surface side of
the material 2 in the same manner as in -1-). Further, as shown in FIGS. 2 and 3, it is possible to
form the fiber layer 4 and the film layer 5 without the backing material layer 3 on the surface
side of the diaphragm (II) and the material 2 as well. As ram layer 4 made of high elastic fiber,
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woven fabric or non-woven fabric limited to unidirectional prepreg can be used, and different
high elastic fibers can be used on the front side and back side. Also, as shown in Figure 4, carbon
fiber! 17 and carbonized carbon; it is possible to mix different kinds of fibers like gsfan. Also, the
back side can be made of paper quality. As described above, when different fiber layers are used
on the front and back, there is an effect as a composite material, and resonance due to the
material can be suppressed. The formation of the fiber layer is not limited to four divisions as
shown in FIG. 4. If a large number of mo-woven high elastic fibers are used, an effect rf in
bending (deflection) vibration in the radial direction is less likely to occur. In addition, 1. l: As
materials other than the glass fiber cloth noted, a desired high price can be obtained even by
using a material 1 which is finely meshed, can be thinly formed, and has heat resistance 1 such
as 7-amide fiber cloth. When the cone type honeycomb diaphragm (+ f (diameter 200 m + s,
voice coil diameter 50 mm) shown in FIG. 3 described above is incorporated into the speaker unit
M, air load is applied since defects such as pinholes do not occur. There was no next ↑ or any
other person, and the +1 live band was 1-to-1 and the frequency characteristics were t-slip.
[Effects of the Invention] According to the speaker diaphragm of the present invention, the
structure is formed by the diaphragm base material by the honeycomb core and the fiber layer
by the high elastic fiber provided with the backing layer by the glass fiber cloth If the film has
high rigidity, it has a suitable internal loss, and a film layer of acetate cellulose is formed on the
surface of the fiber m layer, so it has weatherability and surface stability, pinholes, voids, etc.
Makes it difficult to apply an air load or generate a third-order distortion associated with it, so
that the IIf raw band can be significantly expanded, and a speaker diaphragm of excellent
characteristics can be obtained. .
Further, according to the manufacturing method of the speaker diaphragm according to the
present invention, the backing material of the glass fiber cloth and the base fabric of the high
elastic fiber of the carbon fiber are temporarily fixed, and this is used as the diaphragm base by
the honeycomb core. Since heat and pressure are applied to the surface of the material with a die
for forming a diaphragm plate coated with an acetate cellulose solution, a honeycomb resin is
made of thermosetting resin such as epoxy resin which is impregnated in the above-mentioned
fibers. A base fabric of high elastic fibers provided with a backing material layer can be adhered
to obtain a structure of these, and a film layer of acetate cellulose can be formed on the
outermost layer by the above heating and pressing. Since this acetate cellulose film does not
adhere to the mold and is excellent in releasability, the 1 & moldability is extremely good, and
there are no pinholes, etc., and it is also effective for the modification of the fiber base surface,
weatherability As well as being excellent in heat resistance and solvent resistance, pinholes of A
& cloth become invisible due to the presence of the backing material of the glass fiber cloth, and
the appearance becomes excellent. In this way, it is possible to obtain a honeycomb core root
moving plate free of third-order distortion and the like in a cylinder if it is excellent in
mechanical strength 1 elasticity and internal loss ff 8 m. 4, IPl width of the drawing IJI drawing
shows an example of a speaker diaphragm according to the unborn IJI, FIG. 1 is a fiber layer with
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a backing material layer and one side of the film layer laminated honeycomb diaphragm base
material ( 2 is a cross-sectional view showing an example in which a fiber layer and a film layer
without a backing material layer are provided on the back surface side, and FIG. 3 is different
from the fiber layer on the back surface side. Sectional view in the case where there is a material
t: tS4m is an f-plane showing an arrangement of the unidirectional high-elasticity fiber. 1: The
entire plate moving plate for speakers, 2 :: #A! ! #I plate No, (backing material layer 4 by the
material 3 glass lll cloth: fiber layer, 5: film layer.
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