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JPS61245798

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DESCRIPTION JPS61245798
[0001]
TECHNICAL FIELD The present invention relates to an improvement of a method of
manufacturing a vibrating body such as a diaphragm and a center cap used for a speaker, and
more particularly to a method of manufacturing an imaging moving body having a surface
embossed. BACKGROUND ART In general, a diaphragm in an electrodynamic speaker and a
center cap provided at the center of the diaphragm are known as a speaker vibrator.
Conventionally, the physical properties of the speaker diaphragm are required to be lightweight,
high in rigidity, have appropriate internal loss, and have a large ratio rrZ7 of Young's modulus E
to density ?. These are essential for obtaining the correct piston movement of the diaphragm
itself. Further, the speaker center cap is an important member as an auxiliary diaphragm for
dustproofing the magnetic circuit of the speaker and high frequency range. Therefore, also in
such a center cap, physical characteristics such as high specific elastic modulus, low density, high
internal loss, etc. are required like the diaphragm, in order to have a great influence on the
frequency characteristics of the diaphragm itself, particularly the high frequency band. There is.
Many vibrators made of thermoplastic resin such as polyethylene, polystyrene and polyamide, or
vibrators made by mixing thermoplastic resin with some kind of filler such as mica, talc, carbon
etc. It is being developed. In particular, some molded articles obtained by mixing mica, carbon
graphite, etc. have a large ratio E [7T of Young's modulus E to density ?, and some have
excellent acoustic characteristics. In the method of producing a vibrator mainly composed of
these thermoplastic resins, a thermoplastic resin alone or a mixture of a thermoplastic resin and
a filler such as mica, talc, carbon or the like is formed into a flat plate or sheet. Then, the method
of press-molding the flat plate using a molding die is known. The molding die is used, for
example, in a dome shape, a cone shape or the like. According to such a manufacturing method, it
is possible to obtain a vibrator which is a large amount of molded articles with the same molding
die. However, in order to obtain various sizes, shapes, and designs of the vibrator, a
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corresponding amount of molding dies is required. In addition, replacement of various molding
dies in the manufacturing process is complicated. Therefore, a large amount of expensive
molding die is required, which leads to an increase in working time and cost, and the method of
manufacturing a vibrator for an acoustic diaphragm is not always satisfactory. SUMMARY OF
THE INVENTION The object of the present invention is to solve the above-mentioned
conventional problems, and to provide a speaker vibrator manufacturing method having ease of
operation.
The method for producing a vibrator according to the present invention comprises a sheet
forming step of forming a flat plate made of a mixture of a filler and a thermoplastic resin or a
thermoplastic resin, a heating step of heating the obtained flat plate, and a heated state. Forming
a flat plate into a predetermined shape by pressing the flat plate against a relief mold removably
mounted on a forming mold and forming the flat plate into a predetermined shape, and cutting
the flat plate obtained by the forming step And a cutting step. Below, an embodiment of the
present invention will be described based on the attached drawings. In this embodiment, a
speaker moving plate is manufactured as If as a vibrating body. First, in the sheet forming step, a
material made of a thermoplastic resin such as polyethylene, polystyrene or polyamide or a
mixture of the thermoplastic resin mixed with mica, talc, carbon or the like is used according to
the sheeting temperature corresponding to the material resin. The material resin is formed into a
sheet by melt extrusion or the like to obtain a sheet having a desired thickness, that is, a flat
plate. Next, the sheet 1 obtained as shown in the schematic cross sectional view of FIG. 1 is
introduced into a press such as a heating and cooling press machine. In the upper mold of the
heating and cooling press machine, the heater 2 is attached so as to be located in the vicinity of
the introduced sheet 1. The heater 2 is heated to a predetermined temperature to heat the sheet
1. Further, on the side facing the heater 1, a convex cone-shaped molding die 4 is provided. On
the forming mold 4, a circular woven wire mesh 3 similar to the convex cone shape is attached so
as to detachably cover it. In addition, the circular woven wire mesh 3 is a relief mold for
providing the sheet 1 with minute asperities. In the heating step, the sheet 1 is positioned on the
woven wire mesh 3 and the molding die 4 and heated by the heater 1. Next, as shown in the
schematic cross-sectional view of FIG. 2 as a forming step, the heating and cooling press machine
is operated to cover the woven wire mesh 3 and the molding die 4 and the heated sheet 1 is
woven woven wire 3 Press against At this time, when the woven wire mesh 3 forms a relief of
woven wire mesh pattern which is micro unevenness on the main surface of the sheet 1 heated
and softened at a temperature corresponding to the sheet material, it simultaneously shapes the
sheet 1 into a predetermined cone shape. In this molding process, the air remaining between the
sheet 1 and the convex cone-shaped projecting portion of the molding die 4 is discharged by a
vacuum pump from the molding die 4 side in a compressed air atmosphere. Next, the sheet 1
formed as shown in the schematic cross sectional view of FIG. 3 is taken out from the woven wire
mesh 3. Finally, as a cutting step, as shown in the schematic cross sectional view of FIG. 4, the
cone-shaped sheet 1 carrying embossed metal woven pattern is cut into a predetermined
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diaphragm shape and shown in the schematic front view of FIG. A speaker diaphragm as
described above is obtained.
Here, a circular woven wire mesh is used as a circular relief mold covered with the molding die 4
in the molding step, but the circular relief mold has a mesh-like surface, Any relief mold
processed into a punching (E) punching shape or the like may be used. For example, a circular
woven wire mesh as shown in the partial front view of FIGS. 6 to 9 or a circular punched
perforated plate as shown in the partial front view of FIGS. 10 to 15 may be used. 6 shows a
plain woven wire mesh, FIG. 7 shows a tatami woven wire mesh, FIG. 8 shows a twill woven wire
mesh, and FIG. 9 shows a triple woven wire mesh. 10 shows a circular punched perforated plate,
FIG. 11 shows a circular punched perforated plate, FIG. 10 shows a block punched perforated
plate, FIG. 12 shows a hexagonal punched perforated plate, and FIG. Shows a rectangular
punched perforated plate, FIG. 14 shows an oval punched perforated plate, and FIG. 15 shows an
oblique oval punched perforated plate. FIG. 16 shows respective sound pressure frequency
characteristics of the speaker using the diaphragm having the relief of the plain woven metal
mesh pattern obtained in the present embodiment and the speaker using the conventional
diaphragm without the relief of the pattern. FIG. Curve A shows the characteristics of the
loudspeaker according to this embodiment, and curve B shows the characteristics of the
loudspeaker using the conventional diaphragm. As apparent from the figure, if the diaphragm of
this embodiment is used, it is possible to obtain a speaker whose sound pressure frequency
characteristic is flattened and whose band is expanded to a higher frequency range than that of
the conventional one. Although the diaphragm has been described in the present embodiment, it
is apparent that the center cap which is a vibrator can be manufactured by the above
manufacturing method. As described above, according to the manufacturing method of the
present invention, by making the arbitrary relief molds exchangeable, it is possible to press-mold
a sheet made of a thermoplastic resin, so that various designs or patterns having a desired design
can be obtained. Since the press-formed product can be obtained with the same molding die, the
manufacturing process can be simplified and the speaker diaphragm can be obtained
inexpensively. In addition, it is possible to obtain a speaker diaphragm in which the mesh and
punched patterns have a reinforcing effect to improve the acoustic characteristics of the speaker.
[0002]
Brief description of the drawings
[0003]
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1 to 4 are schematic cross-sectional views showing the manufacturing process of this
embodiment, FIG. 5 is a front view of the diaphragm obtained in this embodiment, and FIGS. 6 to
15 are circles. FIG. 16 is a graph showing sound pressure frequency characteristics of the
speaker using the diaphragm of the present embodiment and the speaker using the conventional
diaphragm.
Explanation of the code of the main part 1 ииииииииииииииииииииииииииииииииииии Woven wire mesh 4 иииииииииииии Mold
mold
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