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JPH06270196

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DESCRIPTION JPH06270196
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
manufacturing method for integrally molding a cone and an edge of an acoustic speaker, and
more particularly to integrally molding both a cone and an edge and further a gasket.
[0002]
2. Description of the Related Art Generally, as shown in FIG. 6, the speaker supports the center of
the sound generating cone 1 with a damper, and the outer peripheral edge is an edge 2 made of
an elastomeric material through a gasket 3 (FIG. (Not shown). The cone 1 and the edge 2 need to
be bonded integrally, and conventionally there has been a problem that the bonding process for
this takes time and labor, and the working process becomes complicated. Also, in recent years,
the demand for small-sized and high-power speakers has been increasing year by year with the
spread of in-vehicle audio, the outdoor use of radio cassettes, and the improvement of television
sound quality due to the development of satellite broadcasting. Therefore, the component
material of the speaker is also changing accordingly. That is, instead of paper-made cones that
have often been used conventionally, synthetic resin-made cones have been increasingly adopted.
Also, the edge is changing from compressed urethane foam to an elastomer such as rubber.
Although high-quality, small-sized, high-output speakers have appeared due to the adoption of
such materials, it is the present situation that adhesion of synthetic resin cones and elastomers
such as rubber is performed with an adhesive. Since the cone made of synthetic resin is relatively
hard and the elastomer such as rubber is relatively soft, the adhesion between them is somewhat
unreliable.
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[0003]
Therefore, as disclosed in Japanese Patent Publication No. 57-18399, it has been proposed to
integrally form a cone and an edge as shown in FIG. In this case, the preformed cone 1 is inserted
into a forming mold 4, 5 having a cavity 10 of a predetermined shape for the edge 2 at its outer
periphery, and the edge material from the injection nozzle 20 is said edge through the injection
gate 6 By injecting into the cavity 10, the cone 1 and the edge inner peripheral portion 12 are
integrated to form the edge 2 having the edge R portion 13 and the edge outer peripheral
portion 14 as described above. The cone 1 made of synthetic resin is generally a hard material,
and the edge needs to use a relatively soft material such as rubber in order to block the
transmission of vibration. Therefore, since there is a difference in the amount of thermal
contraction between the two, there is a possibility that the edge R portion 13 and the gate
intermediate weld portion may be cooled and deformed by contact with the outside air at the
time of mold release from the mold. Since the edge is relatively thin, it is difficult to separate it
from the mold and there is a problem that a stable edge R can not be obtained.
[0004]
SUMMARY OF THE INVENTION The present invention solves the above-described conventional
problems and implements the invention, and when the cone and the edge of the speaker are
attached to the frame, the outer peripheral edge of the edge In the present invention, it is
possible to easily bond the cone and the edge by using the gasket, and the deformation at the
time of releasing the edge in the integral injection molding according to the present invention. To
maintain the predetermined shape of the stable edge, thereby enhancing the practicability.
[0005]
To this end, in the present invention, a preformed cone and a gasket are inserted between a
forming convex mold and a forming concave mold having an edge cavity of a predetermined
shape between the cone and the gasket. And injection molding an elastomeric material for the
edge into the cavity, and injecting the elastomeric material for the edge into the cavity for the
edge through a fan gate provided further outside the edge periphery. The gasket may be
disposed at the bottom of the fan gate.
The junction with the edge of the cone may be formed thick, and the forming concave die may be
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provided with a setting step of the outer peripheral edge of the cone. In addition, a vacuum slit
for suctioning the cone and the gasket is provided at the corresponding position of the mold
where the cone and the gasket are set, and the gasket and the fan gate are separated at the
corresponding position of the gasket and the fan gate in the molded concave mold. An eject pin
may be provided which is pushed out during molding. Then, a passage may be provided on the
outer periphery of the eject pin so that the vacuum slit is also used.
[0006]
According to the present invention, according to the above construction, the preformed cone and
the gasket are inserted between the forming convex mold and the forming concave mold having
the edge cavity of the predetermined shape between the cone and the gasket, Since the edge
elastomeric material is injection molded, the edge R portion is supported between the gasket and
the cone due to the presence of the ring-like gasket, so that a stable shape can be obtained. The
mold release from the mold is easy, and no deformation at the time of mold release occurs. In
addition, since the edge elastomer injected from the injection gate is filled through the outer
peripheral fan gate during injection molding of the edge, a stable edge R without welds can be
obtained. And at the time of mold release, since the gasket is pushed out by the eject pin, mold
release of the edge is further facilitated. On the other hand, when setting the cone and the gasket
to the mold concave mold, the presence of the vacuum slit and the setting step makes it possible
to easily suck and set these reliably, and the work stability. And to achieve efficiency. At this time,
by forming a thick joint with the edge of the cone, a more reliable setting is possible, and the
edge material is formed in the generated clearance between the outer periphery of the cone and
the setting step. Even if the compressive force acts on the cone by flowing in, it is possible to
secure the resistance against this.
[0007]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a first embodiment of the present invention, in which a cone 1 and a gasket 3
formed in advance are molded into a convex mold so that an edge cavity 10 of a predetermined
shape is formed between the cone 1 and the gasket 3. Insert between 4 and mold concave mold
5. The cone 1 is made of a material such as metal other than synthetic resin such as
polypropylene. The edge 2 is made of an injection moldable synthetic resin such as a styrenebased thermoplastic elastomer. Similar to the cone 1, the gasket 3 is selected from materials such
as metal in addition to synthetic resin such as polypropylene. When the cone 1 and the gasket 3
are inserted into the mold concave mold 5 and set, as shown in FIG. 3, the thick portion 11 of the
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outer peripheral edge of the cone 1 is a mold concave metal. At the same time as the setting step
18 of the mold 5 is reliably set, these thick portions 11 are provided by vacuum slits 15 provided
at corresponding positions of the forming concave die 5 in which the thick portions 11 and the
gasket 3 are set. And the gasket 3 is sucked and set in the mold concave mold 5 quickly and
reliably. This realizes the stability and efficiency of the work. Then, the edge material from the
injection nozzle (not shown) is injected through the injection gate 6 into the cavity 10 for the
edge 2 formed as described above. An outer peripheral fan gate 7 is formed on the outer side of
the cavity for the edge outer peripheral portion 14 to be supported by the gasket 3, and the edge
elastomer injected from the injection gate at the time of injection molding forms the outer
peripheral fan gate 7. By being filled through, it is softened that the edge elastomer is directly
injected vigorously to the edge periphery 14 of the thin-walled portion at the edge 2, and a stable
edge R without weld is obtained.
[0008]
Next, a second embodiment of the present invention shown in FIG. 2 will be described. In this
example, the gasket 3 is disposed at the portion constituting the fan gate, and the gasket 3 is set
at the bottom of the fan gate which becomes the edge outer peripheral portion 14 after molding,
and the injection gate Since the edge elastomer to be injected is filled, it is not directly injected
into the thin portion of the edge 2 as in the embodiment of FIG. Thus, the integrally molded cone
1, the edge 2 and the gasket 3 are formed in the mold concave mold 5 after the mold concave
mold 5 is separated from the mold convex mold 4. It is easily pushed out by the eject pins 8 and
9 provided at the corresponding positions of (1), and the thin edge portion R is released without
deformation. Finally, it is cut at a cut surface shown by a line C-C in FIG. 1 to be a finished
product. Further, by forming the joint portion with the edge 2 in the cone 1 thick, as shown in
FIG. 3, more reliable setting is possible, and the outer peripheral edge of the cone 1 and the
setting step 18 Even if the compressive force F applied to the thick portion 11 of the cone 1 as
shown in FIG. It is. Incidentally, as shown by 16 in FIG. 1, by forming the eject pin 8 into a
polygonal cross section, a passage 16 is formed between the eject pin 8 and the eject pin
insertion hole of the circular cross section to communicate with the vacuum slit 15, 8 and the
vacuum slit 15 can also be used. At this time, an appropriate O-ring 17 is interposed so that the
vacuum pressure does not leak to the outside.
[0009]
As described above, according to the present invention, the preformed cone and the gasket are
formed between the convex mold and the concave mold so that an edge cavity of a
predetermined shape is formed between the cone and the gasket. Since the insert and injection
molding of the edge elastomer material into the cavity, the presence of the ring-like gasket
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ensures that the edge R portion is supported between the gasket and the cone and by these, it is
stable. It is possible to obtain a speaker having a shape that is easy to release from the mold and
with less deformation at the time of release.
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