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Description 1, title of the invention
Fiber reinforced foam plastic diaphragm
3. Detailed Description of the Invention The present invention relates to a diaphragm of an
electric 音響 acoustic transducer, and relates to a fiber-reinforced foamed plastic diaphragm
having low density and high loss. A conventionally used paper diaphragm is beaten-paper-made
natural wood fiber. This maintains adequate modulus, density, and also provides adequate
mechanical internal loss due to the looseness of entanglement between the fibers. In addition, a
material aiming at securing a high elastic modulus is also used by adding an appropriate amount
of an appropriate thermosetting resin, thermoplastic resin, or high elasticity carbon fiber 9
synthetic resin fiber to the material of the paper diaphragm. However, in any of the paper
diaphragms, the main component of the structure is natural wood fiber. Therefore, the material
fluctuation is large, and furthermore, the quality fluctuation also occurs depending on the
beating condition. In addition, since a large amount of water is used at the time of beating, the
fine fiber powder generated by the beating is mixed in the water, causing a problem of liquid
repellent treatment. The present invention uses a material with small quality fluctuation and a
clear quality and process control factor in place of the paper diaphragm, and the same or better
characteristics as the paper by the impregnation-forming method which does not require the
liquid repellent treatment. A diaphragm provided is obtained. In the diaphragm according to the
present invention, fibers such as glass fibers and aromatic polyamide fibers are short-cut and the
end direction of the fibers EndPage: 1 is eliminated to make a non-woven fabric, and the weight
of each part of the non-woven fabric is made uniform. Suppresses the occurrence of local
abnormal vibration when the diaphragm is configured. Also, in the area where the fibers
mutually overlap, the fibers of the low melting point or the small diameter side are heated and
melted to form a strong node between the adjacent fibers to form a mechanical bond of the nonwoven fabric forming the skeleton. It is something to enlarge. For resin that has the shape
retention effect by impregnating and curing into non-woven fabric, choose acrylic resin with high
elasticity and fatigue resistance as much as possible, and aim to simplify the process of molding
and foaming, and improve bending rigidity The method is adopted to make the thickness large
and uniform. Hereinafter, a diaphragm according to the present invention will be described by
way of examples. Glass fibers, aromatic polyamide fibers, polyester fibers, and acrylic fibers are
among the fiber materials that form the framework of the diaphragm. Shortly cut 2 or 3 kinds of
fibers which differ by ~ 30 ° C or have a fiber diameter of 3 to 5μ to a length of 10 xg or less,
and this does not cause the directionality of the fibers 9 local weight non-uniformity Spray and
heat at a temperature at which the low melting or small diameter fibers melt to melt the low
melting or small diameter fibers at the portions where the fibers are mutually superposed, and a
non-woven fabric with strong nodes of the fibers. Get
The shape retention of the diaphragm and the filling of the voids of the non-woven fabric of the
frame material are made of hard plastic such as styrene, acrylic, phenol, urethane and the like.
That is, a suitable solvent which does not induce a molecular weight fluctuation of, for example,
acrylic resin-based methyl methacrylate, acrylamide, and methacrylamide, to which a foaming
agent is added, which is compatible with the above resin and each resin, In this case, it is
dissolved or suspended in a hydrophilic solvent such as ketones and alcohols to make a paint,
and the above non-woven fabric is dipped into this to impregnate the resin liquid, then it is taken
out and the solvent is scattered And dried to obtain a prepreg thin plate having a non-woven
fabric impregnated with uncured foamed resin as a skeleton. This prepreg thin plate is used as a
body to be molded, and it is sandwiched between a pair of male and female molds having a
predetermined shape and size, and a predetermined prefectural condition, for example, an acrylic
120-140 ° C warmth, 5-10 to 9 /- It is heated and pressure-molded to obtain a predetermined
diaphragm. Here, the thickness of the diaphragm necessary for holding the bending rigidity is
appropriately adjusted by adjusting the forming conditions, and the details will be described
according to specific examples. Example 1 A polyester fiber 10 (1 ** part with a melting point of
245 ° C. and a polyester fiber 100 N placing part with a melting point of 260 ° C. are sold
short to 3 to 5%, kt fiber using an air stream, The sample is randomly arranged so that there is
no directionality in the arrangement of the fibers, and it is passed through an electric furnace
maintained at a temperature of 250 ° C. to melt the fibers on the low melting side at the contact
points of the fibers and firmly bond Obtain a non-woven fabric with the nodal points provided.
The state of fiber orientation in the non-woven fabric is schematically shown in FIG. The weight
of the non-woven fabric obtained here is 180 g β and the thickness is 1.9 dew. In the non-woven
fabric schematically shown in FIG. 1, 1 is a short fiber and 2 is a node between fibers. The tensile
strength was 9 / @ 10 in 7.3 in the longitudinal direction of the non-woven fabric, and 8.2 v in
the width direction was 10 m. In addition, the tensile strength of the products different in weight
and thickness was substantially proportional to the weight of the above-mentioned product. 100
parts by weight of methyl methacrylate and 50 parts by weight of acrylamide are mixed with the
coating material to be impregnated into the non-woven fabric, to which are added the abovementioned parts by weight of the azohis isobutyronitillo button as a main foaming agent, and
appropriately adding a foaming aid The resulting resin is suspended in 150 parts of methyl
alcohol to form an impregnated resin solution 9. In this, the non-woven fabric obtained above is
soaked for 10 minutes in a tank kept at a temperature of 30 ° C. and a pressure of BootTorv to
contain a resin solution. Further, air drying in a room at a temperature of 25 ° C. for 1 hour, and
further exposure for 30 minutes in a hot air flow of 60 ° C. to scatter the solvent and drying to
obtain a prepreg thin plate having a nonwoven fabric as a skeleton.
Prepreg board thickness is 2.1 錦, 'N amount is 280 g /? EndPage:2でおうた。
Subsequently, the prepreg plate 3 is narrowed between the fixed mold 4 and the movable mold 6
in a male and female mold shown in FIG. 2 and heated to 130 ° C. at a pressure of 9 / cIl for 3
seconds. Later, the movable die 6 is driven, the distance between the fixed die 4 and the movable
die 6 is kept at 2.2 m, and the prepreg plate 3 is pressed by the peripheral presser ring 5 to
decompress the male and female dies so that heating is performed for 2 seconds. Do. During this
operation, the blowing agent decomposes at 100 to 5 ° C. to generate nitrogen gas by the
reaction, and the impregnated resin increases the volume of the foaming-apparent to fill the
voids of the non-woven fabric. The pressure reduction between the fixed mold 4 and the movable
mold 6 is performed by a water flow pump 10 and the gas exhaust hole 7 is exhausted. 8 is a
switching pulp and 9 is a leak pulp. The situation of the situation change of the nonwoven fabric
in this operation is shown typically in FIG. In FIG. 3, 12 is a molded body, and 13 is a foamed
resin. The situation of the compact 12 squeezed into the movable mold 6 is shown in FIG. The
thickness of the diaphragm obtained here is 2.2ta, the density is o, stt / ai, the speed of sound (/
EI, 4.ff = elastic modulus, fi: density) is 2.800m / seC. The sound pressure-frequency
characteristics obtained by comparing the speaker units of the same aperture were better than
those of the speaker unit using a paper diaphragm, as shown in FIG. In FIG. 5, curve 14
represents the sound pressure characteristic of the speaker using the diaphragm according to the
present invention, 15 represents the sound pressure characteristic of the speaker using the
foamed acrylic resin diaphragm, and 16 represents the sound pressure of the speaker using the
paper diaphragm. It is a characteristic. Example 2 The same non-woven fabric as in Example 1
except for the thickness was impregnated with the same resin solution as in Example 1 and
molded under the same conditions as in Example 1. However, since the thickness of the nonwoven fabric is different from that in Example 1 and is 1 inch, the warm-to-warm distance of the
pair of strings and males is 1. I kept it on. The thickness of the obtained diaphragm is 1 ° 13 m,
and the density is 0.78 · 7 · g / cI! t, the speed of sound was 2.700 t / sec. Also, the high-pass
resonant frequency in the sound pressure-frequency characteristics of the speaker unit using this
diaphragm is 4.6 KHz, 1.6 times that of paper, and the sharpness (Q) at that point is equivalent to
that of paper The Example 3 1 part by weight of aromatic polyamide fiber having a fiber
diameter of 4 μm and the side part by weight of aromatic polyamide fiber having a fiber
diameter of 10 μm short to 2 to 3 u, Example: random arrangement by the same method Then,
it was heated at 240 ° C. to induce thermal deformation of the small diameter side fibers, and
the entanglement of the points where the fibers are in contact with each other made a nonwoven fabric having strong nodal points.
Weight of this non-woven fabric: ij 190 # / W, thickness: 1.95 W; tensile strength is 9 at 2168 in
the longitudinal direction of the non-woven fabric / 10 m in width, 28 in the width direction. It
was 10 m. In addition, although the weight and thickness were different, the tensile strength was
approximately proportional to the weight of Wang Lei. Here, it is the same as Example 1! 1iIWL
was impregnated under the same conditions as in Example 1 to obtain a prepreg thin plate
having an aromatic polyamido non-woven fabric as a skeleton. Further, a diaphragm was
manufactured by molding under the same conditions as in Example 8 and Example 1. The
vibration plate had a thickness of 2.15 m, o, ssy / di, and a speed of sound of 2.950 m / sec. In
addition, the high-frequency resonance point in the sound pressure-frequency characteristics of
the speaker unit using this diaphragm is 1.8 times that of paper, and the diameter of the paper is
6 μm. It was 5.1 KHz equivalent to a diaphragm made of 30% by weight of high elastic form
carbon fiber having a length of 3 to 10 m, and the sharpness Q at that point was equivalent to
paper. As described above, as seen in the embodiment described above, a diaphragm having a
mechanical internal loss property equivalent to paper and capable of holding a high-resonance
frequency reaching 1.6 to 1.8 times that of paper can be obtained by a simple method. Be It is to
be noted that substantially the same effect can be obtained by using a resin such as polystyrene,
polyurethane or phenol as the acrylic resin glue 9. According to the present invention, it is a low
price that is almost equal to the paper diaphragm, and the impregnation molding method that
does not cause the problem of pollution such as liquid repellent treatment, the density equivalent
to paper or hard plastic, a mechanical internal It is possible to obtain a fiber-reinforced foamed
plastic diaphragm having lossy property, an elastic modulus equal to or higher than EndPage: 3.
4. Brief description of the drawings. FIG. 1 is a partially enlarged view schematically showing the
nonwoven fabric of the diaphragm according to the present invention, and FIG. 2 is a crosssectional view showing the formation of the prepreg thin plate of the diaphragm of the present
invention. Fig. 3 is an enlarged partial sectional view schematically showing a diaphragm
obtained by forming a thin plate of preg, Fig. 4 is a sectional view showing a forming condition
when a formed product is pressed against a movable mold, Fig. 5 These are the sound pressurefrequency characteristic figures of the speaker unit by the diaphragm in Example 1, and the
diaphragm compared. 1: Monofilament, 2: Nodal point, 3 nibbled plate, 4: Fixed type, 5: Presser
ring, 6: Movable type, 10: Water flow pump. Attorney Attorney Attorney-Minute 1) Toshiyuki, 11
° 亭 2 Events 3 Figure 4 End Page: 4
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