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Description 1, title of the invention
Method of forming diaphragm for speaker
3. Detailed Description of the Invention The present invention relates to a method of molding a
thermoplastic resin film such as Polycarbonate or polypropylene ABS resin into a diaphragm
shape of a speaker. Conventionally, vacuum or pressure forming has been employed to shape the
thermoplastic resin film, for example, on a frusto-conical (cone) diaphragm. This will be described
with reference to FIG. 1C), (b) and (C). In the figure, 1 is a heater, 2 is a thermoplastic resin film,
8 is a clamper, 4 is a cone-shaped mold, and 5 is a suction hole. The film 2 clamped by the heater
3 is heated and softened by the heater 1 (FIG. 1)). Next, the clamper 8 is lowered or the mold 4 is
raised to pretension (FIG. 1 (b)). Next, a large suction of air between the film 2 and the mold 4
from the suction hole 5 brings the film 2 into close contact with the mold 4 and zo (FIG. 1 (C)) Is
cut to obtain a cone-shaped diaphragm. The above-mentioned vacuum forming is a drape
method, and instead of the straight method or suction, pressure forming is also performed in
which the film 2 is pressed against the mold with compressed air. Although such a molding
method is relatively mass-productive or advantageous, it has the following disadvantages when
the obtained molded product is considered from the viewpoint of a speaker diaphragm. EndPage:
1, ie, the softened film is stretched and brought into close contact with the mold in the pretension
and suction steps, or the rate of stretching is the largest at the top of the mold, ie, the neck where
it is connected to the coil bobbin The thickness of this portion becomes the thinnest, and as it
gets closer to the periphery, a diaphragm of which thickness increases as it gets will be obtainedhowever, it! As for a moving plate, it is preferable that the stiffness of the neck portion is the
largest and the stiffness decreases as it gets closer to the periphery. This (d by changing the
thickness of each part in a diaphragm made of a uniform material)-meeting the requirements
described above or usual, but in vacuum or vacuum forming as described above振 板 板 全 3 3 3
3 3 3 3 (, (, 1 '+ 7 “セでj−)、、、1.。 Therefore, the present invention improves the mass
productivity at a village, reduces the thickness as the neck portion gets thicker, and approaches
the periphery [7. 3 and 2 show one of the molds 21 used in the molding method of the present
invention, and the two semi-circular cones have their maximum diameters, and the 1IJ1 part 22
or the drilled part 11 has a shape reversely tied in part. Further, by overlapping the forming
molds 21 which are drilled with the cooling water pipe 23, two cones form a continuous concave
space at their maximum diameter in a symmetrical manner in two directions.
Next, the third M (a), the reason for the formation method will be described. In the figure, it is a
31st die, and a blowout hole 31a at the center or a ring-like extrusion hole 81b inside is provided
respectively. . Then, the thermoplastic resin does not hang down in the form of a tube 32 when it
is pushed out from the extruded stone 8 ′ ′ lb from the hot plasticity horizontal area melted by
a crusher or the like. Next, when the mold 21.21 is stacked, the lower end of the tube 32 is
closed, and compressed air is blown out from the outlet 31a, the Lt force causes the tube 32 to
expand in the radial direction. 21. , 2] in pressure contact with the inner wall of the recess 22.
Then, the cured molded product is taken out of the molding die 21 and shredded as shown in
FIG. 4 at the maximum diameter portion (dotted line portion in FIG. 4) to obtain two cone-shaped
diaphragms. Since the thermoplastic resin of the tube shape 32 is formed by stretching and
bulging I7 in a substantially radial direction in the same manner as in the forming plate obtained
in the 71.tau. The force of the simmering slap or thinly formed off 1, and the said W, the
vibration A obtained by the Hun form method, j1. ! (7 min. L toy sheep roe (to the neck sound 1)
(in the thickest, diameter or a dog scale to the dog (outside the diaphragm +?, As close to I) thin
<1. Cocoon, V Also, it is possible to obtain a swing plate with greater stiffness at the neck portion.
y As two diaphragms can be obtained in one molding step, mass productivity can be further
enhanced, and a minimum diameter portion of l4 can be used as a coil bobbin. In addition, there
is an immediate advantage that, for example, the force required as a squeeze basin can be
eliminated, the characteristics, the improvement of the productivity of the diaphragm 4A, the
improvement of the productivity of the diaphragm, and the simplification of the assembly
process of the speaker. The embodiment describes the extrusion blow molding method among
the blow molding, but in addition to the injection blow 1, ν, type-method, ro-paris parison
method, blow resistance に よ る by sheet material, etc. It can be applied.
4. Brief description of the drawings 14th (al, (b), (C) is a cross-sectional view showing a
conventional vacuum forming step, FIG. 2 is a W-shape square (· τ for one forming using the
present invention) Mold, FIG. 3 ((Roll), ■) is a cross-sectional view showing the molding method
of this method. 21 is a mold for molding, and 22 is a recess. Patent assignee Onkyo shares late
deputy 1 Jing Yu large patent attorney! Conventional part EndPage: 2 procedure supplementary
manual (type)], '1 display Patent application for patent application No. 144024 No. 2, title of the
invention 2, title of the invention Person making correction method 3 of diaphragm for speaker
Relationship with patent applicant Lee 1 place 〒 572 春 1 Spring 11 '1 薪 両 両 両 ”” 名称 名
称 No. 1 name (027) Orekio Co., Ltd. representative five generation Takeshi 4, agent address 〒
572 Osaka Prefecture Name of Neyagawa city Nisshincho 2-1-4 N kiyo Co., Ltd. Name (6443)
Patent attorney Saita part (部 0720-33-5631) 5 Complementary IF command date of January,
1951 Showa 5 岬 January 21) 1 subject to correction 6 1 of the correction of the MI book
column 4 of the "simple explanation of the drawing", the content of the correction EndPage: 3
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