JPH02146898

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DESCRIPTION JPH02146898
[0001]
<Industrial field of application> The present invention relates to a vibrator in which a woven
fabric formed in advance in a vibrator of a speaker is used as a core material and molded and
solidified by a synthetic resin. <Conventional technology> Conventionally, this type of technology
has been seen in the form of vibrators in the form of cones, domes, etc. before the war, but
impregnating a woven fabric of silk, cotton, etc. with a phenolic resin, and drying it. Then, it was
pressed and molded by a heated mold consisting of a heated male and female, cooled, and
molded and manufactured into a shape as a mold. <Problems to be Solved by the Invention>
However, the diaphragm completed through the above-described manufacturing steps has a low
viscosity of the phenol resin, so the amount of impregnation to the silk cloth, cotton cloth, etc. of
the core material is small. A bulky diaphragm could not be obtained. Therefore, as a diaphragm
for a speaker that vibrates with a large output and a large amplitude, the outer shape is easily
distorted and easily broken. Also, because the edge is solid, large amplitude, low f. The
diaphragm of was also difficult to obtain. In addition, since the elongation rate of the material
was small, it was easy to tear by the pressing force of the pressing die at the time of manufacture.
The present invention is a completely new invention in which the above-mentioned drawbacks
are eliminated, and the configuration thereof will be described with reference to FIGS. 1 to 5
corresponding to the embodiments. The injection mold pressing molds (3a), (: Th) are formed in
advance by closely bonding the outer peripheral portion (1b) and maintaining the vibration
portion (1a) with a gap (L ') equal to the finished thickness (1). After the formed woven fabric (2)
is inserted into the pressing molds (3a) and (3b), the molten resin is melted and pressed from the
sprue (9) and solidified. <Operation> Injection male heating molds (3M) and (3b) are in close
contact with the outer peripheral part (6b) with no gap, and in the central vibration part (6a), the
finished thickness of the product vibration part (1) Since the same gap (t ') as in the above is
maintained, the core material cloth 2) is clamped with the outer peripheral portion (6b) in close
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contact portion, so that the cloth (2) is pulled inward, The molten resin penetrates into the fabric
of the fabric. Embodiments of the present invention will be described with reference to the
drawings. Although FIGS. 1 to 5121 show the embodiment of the present invention, the coneshaped vibrator will be described based on the embodiment shown in FIGS. 1 to 3. FIG. (1) is a
vibrating body, (1a) is a vibrating portion, (1b) is an outer peripheral portion, and (4) is a core
material cloth such as glass wool. (3a), (3b) are equipped with separate heating devices for male
and female molds of the injection mold. (9) is an injection port for sealing the molten resin.
In the grinding of the male form (3a) and (3b), the outer peripheral part (6b) is in close contact,
and the portion (6a) of the central vibrating part is the finished thickness of the vibrating part
(1a) of the vibrating body (1) The same gap (1>) as in 1) is provided. Injection-heated male mold
(3a), (3b) or another mold in advance with glass fiber or glass wool as warp and / or weft woven
fabric (1a) only with mold (3a), (3b) Thermoplasticity such as polyimide melted by high
temperature of about 200 ° C. or higher by pressing and shaping the outer shape in advance or
subsequently setting it in the heated injection mold males u (3a) and (3b) Inject synthetic resin.
The core material fiber (2) is pressed at the outer periphery, and the vibrating portion (1a) is
melted by the male and female pressing molds (3a) and (3b) and melted at about 200 ° C. or
more in a tensioned state. Thermoplastic synthetic resin such as polyimide permeates into the
fiber structure of the core material (2), and is solidified to the same thickness (t ') as the finished
thickness in the gap between the molds (3g) and (3b) . At this time, since the pressing force of
the mold (3a) and (3b) is pressurized by the resin (2) of the vibrating body (1) according to
Pascal's principle, the pressure is constant. The pressure is applied to the resin, and the adhesion
state of the resin becomes uniform at each Since the gap (L ') between the molds (3a) and (3b) is
the finished thickness (1) of the vibrator (1) described above, the thickness (1) of the synthetic
resin is obtained even if the pressure is high. The finished state of the vibrating body (1) exhibits
a smooth surface, and the pattern (4) of the cloth fiber (2) is on the surface, and has an aesthetic
appearance excellent in design. As described above, the present invention has a large degree of
freedom in which the type of core fiber (2), n, ai shape, type of resin, processing temperature, etc.
can be appropriately selected. For example, as shown in FIG. 1 (b), the shape of the core material
fabric (2) is impregnated with a synthetic resin (5a) of low permeability and strong permeability
to retain the shape of the core material, When the high rigidity synthetic resin (5b) is fused on
the outer side, the core fiber (2) and the synthetic resin (5a) and the synthetic resin or 5a), (5b)
have good mutual fusion property and uniform vibration. Body (1) is obtained. In addition, air
permeability can be maintained while shape-retaining the fibers (2) as required. When this
diaphragm is incorporated into a speaker, the edge portion is the same material as the
diaphragm of the present invention for maintaining compliance, and application is difficult. For
example, synthetic rubber is applied as shown in FIG. The edge portion (19) and the like are
separately manufactured and attached to the outer periphery of the vibrating portion (1), and a
voice coil <20), a damper (21) and the like are bonded to complete a vibrating system.
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The diaphragm of the speaker to which the present invention can be applied includes various
shapes such as the above-described cone-shaped vibrating body, a dome-shaped shown in FIG. 4
and a flat-shaped (eg, cambered) shown in FIG. A vibrating body is obtained. Although the
embodiments considered to be representative of the present invention have been described
above, the present invention is not necessarily limited to only the structure of these
embodiments, and includes the constituent requirements of the present invention and the object
of the present invention. It can be suitably modified and implemented within the scope of
achieving the effects described below. <Effects of the Invention> As already apparent from the
above description, the vibrator according to the present invention has a uniform thickness
because the structure of the injection mold has a vibrating portion with a gap and a close contact
with the outer peripheral portion. A large amount of vibrating body can be produced, and the
pattern of the core fabric remains in the product as it is beautiful in design and increases the
commercial value. Since the outer peripheral portion rises thinly at the time of sticking when the
edge portion is attached to the speaker, various effects such as mechanical strength can be
obtained.
[0002]
Brief description of the drawings
[0003]
The drawings are all views of the embodiment of the present invention, and FIG. 1 (a) is a
sectional view of a cone-shaped vibrator, and FIG. 1 (b) is a partially enlarged sectional view of
FIG. 1 (a) 2 is a cross-sectional view of a pressing die, FIG. 3 is a completed view, FIG. 4 is a crosssectional view of a dome-shaped vibrating body, and FIG.
In the figure, (1a) is a vibrating part, (1b) is an outer peripheral part, (2) is a woven fabric, (3a),
(31J) is a pressing die, (9) is a pouring gate, (1) is a finished thickness, (1) Is the gap. Fig. 3 Fig. 2
Fig. 5
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