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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
improvement of a method of manufacturing an acoustic diaphragm such as a speaker cone
diaphragm. [Technical background of the invention and its problems] In general, the material of
the acoustic diaphragm such as the cone diaphragm of the speaker has hitherto been made
without mixing the filler with the thermoplastic resin, or mica, talc, carbon, carbon fiber And so
on are mixed, and many of them are molded into diaphragms. In particular, the acoustic
diaphragm mixed with mica and carbon graphite has a ratio of Young's modulus E to density ρ!
Was large, and quite excellent acoustic characteristics were obtained. However, such an acoustic
diaphragm can only obtain one kind of molded product when the same molding die and molding
material are used, and in order to obtain designs of various appearances, molding gold is used for
each design. In order to require a mold, the number of required molds increases, and the
depreciation cost increases, which causes the cost of the acoustic diaphragm to be expensive, and
can not be satisfied as a method of manufacturing the acoustic diaphragm. The [Object of the
Invention] The present invention forms a pattern such as a mesh pattern, a punching pattern or
the like on the surface of an acoustic diaphragm, and by changing this pattern, it is possible to
use a single molding die for many designs. An object of the present invention is to supply a
diaphragm and thereby to obtain a method of manufacturing a low cost acoustic diaphragm for
cost I-, which does not increase the mold cost. DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENT An embodiment of the present invention will be described below with reference to
the drawings. For example, a filler such as mica, talc, carbon, carbon fiber, etc. is mixed into a
thermoplastic resin such as polyethylene, or a thermoplastic resin alone is rolled into a sheet at a
sheeting temperature compatible with the thermoplastic resin. It is assumed that the film
thickness is required. The mold for molding this sheet into a required diaphragm shape is a
vacuum molding mold in which a female mold A is formed with a cavity A1 having the same
shape as the cone-shaped diaphragm as shown in FIG. The pressing die B is a heating pressing
portion B1 heated to a required temperature by heating steam, electric heat or the like, to which
is attached a pattern plate B2 such as a metal plate or a metal plate having a hole of a required
shape punched. The pattern board B2 can be replaced by the pattern to be formed. The sheet C is
placed on such a female die A, and as shown in FIG. 2, the pressing die B is lowered to press the
pattern board B onto the sheet C. Since the heat pressing part B + of the pressing die B2 is heated
to the required temperature as described above, the design plate B2 is also warmed to this
temperature, and the temperature of the design plate B2 is increased on the upper surface of the
sheet 1-C by the temperature. At the same time as forming a concavo-convex pattern
corresponding to the concavo-convex, the sheet C is also warmed, and the sheet C is softened.
At this time, the air in the cavity A + is drawn out by the pump by the female die A, and the seal
lC softened by this vacuum pressure is in close contact with the wall surface of the cavity A1 of
the female die A as shown in FIG. The sheet C is molded into the same shape as the cavity A1.
Thus, after completion of the patterned LJ and molding of the sheet C, the pressing die B is raised
as shown in FIG. 4, and the sheets C and C are taken out. At this time, the sheet I molded in a
cone shape On the surface C, as shown in FIG. 5, for example, a mesh pattern corresponding to
the wire mesh H of the pattern board B2 is formed. Therefore, in addition to the wire mesh in
which the longitudinal and horizontal wires are alternately presented on the surface, the pattern
board B2 is a modified knit, that is, a plain weave of 6th and 1st, a twill weave of FIG. 7 and a
twill weave of FIG. By using the triple woven wire mesh shown in the figure, or by using a metal
plate having round holes, square holes and elongated holes in FIG. 10 to FIG. It can be modified
as a surface design of -c. Alternatively, it is also possible to partially insert these patterns.
Further, the pressing die B does not attach the design plate B2 to the heating pressing portion B1
(a pattern such as a mesh or a punching may be engraved on the sheet pressing surface of the
heating pressing portion B +, and the same effect can be obtained. Is obtained. [Effects of the
Invention] As described above, according to the present invention, a sheet of thermoplastic resin
or a thermoplastic resin mixed with a filler is pressed against the surface of a sheet of heated
thermoplastic resin or sheet, and the sheet is pressed. Since it is softened to form a concavoconvex pattern corresponding to this pattern on the sheet and at the same time it is molded into
a required shape as an acoustic diaphragm with a molding die, the concavo-convex pattern
formed on the sheet by replacing the patterned board Can change. Therefore, this uneven pattern
can be changed extremely easily according to the purpose or design etc., and the number of
molds required can be reduced in order to cope with various purposes and designs with
individual molding dies, so that mold amortizing is possible. The cost can be reduced, and the
cost of the acoustic diaphragm can be reduced. Furthermore, the concavo-convex pattern such as
the mesh mesh and the punched eye exerts a reinforcing effect of the diaphragm, and when the
concavo-convex pattern has a rib or a shape having a corrugation, the reinforcing effect can be
particularly enhanced and the acoustic characteristics can be improved. . For example, as shown
in FIG. 16, in the woofer using a cone-shaped diaphragm of the same shape, conventionally, the
frequency characteristic like a has been improved like b when the present invention is
Brief description of the drawings
The drawings show an embodiment of the present invention, and FIG. 1 to FIG. 4 show a molding
step 1 sectional view, FIG. 5 is a front view of the product, and FIG. 6 to FIG. FIG. 16 is a plan
view showing the types, and FIG. 16 is a frequency characteristic diagram of the acoustic
diaphragm according to the present invention and the conventional acoustic diaphragm.
A · · · · · · female, A1 · · · · · · cavity, B · · · · · · press die, B1 · · · · · · heated pressure unit, B2 · · · · · ·
pattern plate , C ...... Sheet. Patent Applicant Pioneer Corporation Domoto Mogami Electric Co.,
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