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JPS58215196

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS58215196
[0001]
The present invention relates to a method for manufacturing a speaker diaphragm made of a
zanditch structure in which a thermoplastic resin film is molded and a surface material is joined
to the surface of a core material provided with a plurality of concavo-convex ribs. It is an object
of the present invention to provide a method of manufacturing a speaker diaphragm that is
suitable for mass production by increasing productivity by cutting the outer diameter. In general,
attempts have been made to use a sandoinochi structure formed by bonding a surface material to
the surface of a core material provided with a plurality of uneven ribs by molding a thermal OJ
plastic resin film as a speaker diaphragm. FIG. 1 shows a conventional speaker diaphragm. In FIG.
1, reference numeral 1 denotes a rectangular core formed of a thermoplastic resin film molded
body provided with a plurality of uneven ribs 2 in the radial direction, and reference numeral 3
denotes a rectangular surface member joined to both sides of the rectangular core 10. Since this
diaphragm is provided with a plurality of uneven ribs 2 in the radial direction, there is an
advantage that the strength in the longitudinal direction and the lateral direction can be directed.
However, since the above-described speaker diaphragm has the shape of the stone carving
provided with uneven ribs in the thickness direction, the shape of the core material is broken
simply by cutting using a conventional punching punch press Therefore, it is very difficult to
obtain a diaphragm that is flat and has a well-defined straight surface of the diaphragm by
bonding a surface material such as aluminum to both surfaces of the core material. Although it is
possible to insert the film 8 ? into the mold of the same shape and cut the outer periphery after
dimensioning and forming, it is also possible to cut the outer periphery by this method. However,
if the temperature of the cutting die is low, it is difficult to cut the film. It should be noted that if
the temperature of the cutting die is raised to a certain extent, it can be easily cut without
breaking the core shape at the time of molding, but in this case the core is cooled or quenched
after molding to maintain the uneven shape at the time of molding However, there is a problem
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that heating can not be performed because reheating after molding leads to variations in the
thickness of the core material and deformation of the concavo-convex shape of the core material.
In order to solve the problem -1-, therefore, as shown in FIG. 2, a flat plate portion 4 is provided
on the outer peripheral portion of the core member 1, and the flat plate portion 4 is cut to
facilitate the cutting process. In this case, in the case of heat press bonding in which there is a
sealed unevenness between the core material and the surface during heat press bonding and
solvent bonding between the core material and the surface bond, the shape of the core is the
surface After being bonded, it shrinks to the surface due to air shrinkage, and in the case of
solvent-based bonding, it is difficult to dry the solvent-and it has the disadvantage that it is
always satisfactory. I can not say.
The present invention solves such a conventional defect, and simultaneously cuts a thermoplastic
resin film into a size requiring a core at the time of press molding to a core shape having a
plurality of concavo-convex ribs, and the surface of this core is According to this method, since
the core material can be easily formed and cut, productivity can be improved, and it has an
advantage suitable for mass production. doing. Hereinafter, the present invention will be
described with reference to the drawings of the embodiments. FIG. 3 shows a press to be applied
to the method of the present invention, and in FIG. 3, the press is ?a mold 13 comprising a mold
14 and a lower mold 15 and the above? The mold 14 comprises a film cutting mold 16
mounted via a spring material 17. The surface of the upper mold 14 has a plurality of uneven
portions for forming a plurality of uneven ribs extending in the radial direction, and the surface
of the upper mold 16 has irregularities formed on the surface of the second mold 14. The
molding die 13 having a convex-concave portion facing the portion 4) 1-the mold 14 and the
lower mold 15 has a predetermined clearance 19. Still, the cutting die 16 has a predetermined
clearance 20 with the lower die 16. The press machine cuts the core film into a required size by
setting the clearance 20 between the cutting die 16 and the lower die 1S smaller than the
clearance 19 of the molding die 13. It is When forming a film having a thickness of 6011 m, the
clearance 19 of the molding die may be about 100 ?m, and the clearance 20 of the cutting die
may be about 30 to 50 ?m. Next, a method of manufacturing a core material using a press
described in-will be described with reference to FIG. First, as shown in FIG. 11A, the
thermoplastic resin film 18 is put between the heated upper and lower molding dies 14.15, and
the pressure force to the extent that the filo, 18 does not break is made via the spring material
17. At the same time as the addition, the film 18 is preheated. Thereafter, as shown in FIG. 11B,
the outer periphery of the film 18 was cut by a cutting die 16 which was cut to the outside of the
molding die 14. Thereafter, as shown in FIG. 11C, the film 18 is formed by pressing the forming
die 14 and the facing material is bonded to both sides of this core material. In addition, the film
temperature at the time of cutting of the film 18 is approximately 60 to 80% of the optimum film
forming temperature, and at this time, the film forming mold 14.16 is pressed with a metal
material 17 to preform the film. At the same time, the film 18 is cut by the cutting die 16 and the
molding die 15.
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The film 18 is cut by reducing the clearance 20. In addition, as a method of maintaining the
asperity shape of the formed film, it is sufficient to use a method of flowing cooling water around
the periphery of the mold after cutting and forming, and by doing this, it is possible to cut the
core material film provided with asperity. At the same time, it can be used as a method for
producing a core material suitable for mass production. As described in detail, according to the
present invention, a thermoplastic f1 resin film is pressed into a core shape having a plurality of
uneven ribs. Since tJJ is cut to a size that requires core material at the same time as molding, the
linearity of the cut surface of the side of the diaphragm is not broken, and the core material has a
predetermined size without deformation of the core material itself. Can be cut. Since the size and
shape can be simultaneously formed and cut, no flat plate portion at the outer peripheral portion
is required, and problems such as appearance of shape at the time of bonding of the surface
material and unhardening of the adhesive are reduced. It has the advantage that problems such
as deformation of the shape are also reduced.
[0002]
Brief description of the drawings
[0003]
1 is a partial cutaway oblique view of the conventional speaker diaphragm, FIG. 2 is a 1'l
celebration of the core of the conventional speaker diaphragm, and FIG. 3 is a production of the
speaker diaphragm of the present invention A sectional view of a press machine to be used, and
FIG. 4 is a process diagram of the production of the same diaphragm.
14 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 17 17 ииии Spring set 18
иthe film. Name of Agent Attorney Nakao Toshio Other 1 person Figure 1 Figure 3 Figure 14
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