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JP2008263416

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2008263416
An object of the present invention is to improve the productivity of a speaker diaphragm. In
order to achieve this object, a method of manufacturing a resin plate according to the present
invention comprises a first mold 5 having a deep-drawing mold 8 and a depth in the mold 8 of
the first mold 5. Compression generated by supplying air from the duct 13 by a molding machine
provided with a second mold 7 having a convex portion 6 provided opposite to the throttling
portion 10 and having a duct 13 for air supply It includes a step of bringing the resin film 9 into
close contact with the molding die 8 by the pressure of air. As a result, even in the manufacture
of a deep diaphragm, the resin film 9 can be closely adhered to the deep drawn portion 10, and
the productivity of the speaker diaphragm can be enhanced. [Selected figure] Figure 3
Method of manufacturing speaker diaphragm, speaker diaphragm formed thereby, speaker,
electronic device
[0001]
The present invention relates to a method of manufacturing a speaker diaphragm, a speaker
diaphragm formed by the method, a speaker, and an electronic device.
[0002]
In recent years, with the increase in demand for mobile phones and notebook computers, high
productivity is also required for speakers used for these.
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In order to meet such market requirements, in the method of manufacturing a speaker
diaphragm, a pneumatic forming method, which is excellent in low cost, has been mainly
performed.
[0003]
FIG. 4 is a cross-sectional view of a mold used in a method of manufacturing a speaker
diaphragm according to the conventional air pressure molding method.
[0004]
That is, in the conventional method for manufacturing a speaker diaphragm, the first mold 1
having a desired mold and the second mold 2 provided opposite to the first mold 1 The resin film
3 is clamped while applying temperature to the mold, and air is supplied from the duct 4
provided in the second mold 2 to apply air pressure to the resin film 3 as the first mold 1.
Molding along the
[0005]
In addition, as this prior art document, patent document 1 is mentioned, for example.
Unexamined-Japanese-Patent No. 3-133616
[0006]
However, when the resin film 3 is formed into a deep diaphragm shape, the resin film 3 is
stretched more than necessary in the conventional method for manufacturing a speaker
diaphragm, and the film material is torn.
[0007]
In view of this point, conventionally, this has been dealt with by multistage molding in which the
pressure by compressed air is gradually applied and the resin film 3 is stretched little by little
and molded, but multistage molding requires time and thus excellent productivity. It was not.
[0008]
Therefore, an object of the method for manufacturing a speaker diaphragm according to the
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2
present invention is to improve the productivity of the speaker diaphragm.
[0009]
And in order to achieve this object, in the method for producing a resin sheet according to the
present invention, a first mold having a deep drawing mold and a deep drawing portion of the
first mold are opposed. And the second mold having the air supply duct and the first mold with
the first mold and the second mold opened. Supplying air from a duct, a first step of supporting
the resin film between the mold and the second mold, a second step of clamping the first mold
and the second mold, and The speaker diaphragm is manufactured through a third step of
bringing a resin film into close contact with the molding die of the first mold under the pressure
of the compressed air generated in step b.
[0010]
With the above-described configuration, in the method of manufacturing a speaker diaphragm
according to the present invention, the productivity can be enhanced.
[0011]
This is because the speaker diaphragm is molded by a molding machine provided with a convex
portion in the second mold.
[0012]
That is, when the first mold and the second mold are clamped, the resin film is drawn into the
deep drawn portion of the first mold by the convex portion provided on the second mold, and the
compression is performed. The resin film is not stretched more than necessary at the time of
molding by air pressure.
As a result, it is possible to reduce the possibility of occurrence of defects such as breakage in the
resin film, and it is not necessary to take time to perform multi-stage molding as in the
conventional manufacturing method. Can increase the productivity of
[0013]
Hereinafter, the configuration of a molding machine used in the method of manufacturing a
speaker diaphragm according to the embodiment of the present invention will be described with
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reference to the drawings.
[0014]
As shown in FIG. 1, the molding machine used in the method of manufacturing a resin plate in
the embodiment of the present invention comprises a first mold 5 and a second mold 7 having a
convex portion 6 at the center.
[0015]
The lower surface of the first mold 5 is provided with a forming die 8 formed in the shape of a
desired speaker diaphragm, and the shape of the forming die 8 is transferred to the resin film 9.
A depressed deep drawn portion 10 is provided at the center of the mold 8, and a back pressure
hole 11 is provided penetrating from the deep drawn portion 10 to the back surface.
The back pressure hole 11 sucks air at the time of forming the speaker diaphragm and jets air
after forming the resin plate.
In addition, a first outer shell 12 is provided so as to surround the deep drawn portion 10 in the
first mold 5.
The first outer shell 12 prevents air from leaking outside during molding.
Although not shown, a heater for heating the first mold 5 is provided on the back of the first
mold 5 before the resin plate is formed.
[0016]
The second mold 7 has a convex portion 6 projecting opposite to the deep drawn portion 10 of
the first mold 5.
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The convex portion 6 has a duct 13 through which air for molding is ejected from the second
mold 7 toward the resin film 9.
Furthermore, like the first outer shell 12 of the first mold 5, the second mold 7 is provided with a
second outer shell 14 around the convex portion 6, and these first outer shell 12 and The second
outer shell portion 14 is sealed between the first mold 5 and the second mold 7 by contacting
through the resin film 9 when the molds are clamped together as shown in FIG. The chamber 15
is formed.
Further, like the first mold 5, although not shown, a heater is installed on the back of the second
mold 7.
[0017]
Hereinafter, the procedure of the manufacturing method of the speaker diaphragm in the
embodiment of the present invention will be described using the drawings.
[0018]
First, in the first step, as shown in FIG. 1, desired transfer positions on the mold 8 and the resin
film 9 coincide with each other with the first mold 5 and the second mold 7 opened. The resin
film 9 is supported between the first mold 5 and the second mold 7.
Before the first step, the first mold 5 and the second mold 7 are heated by a heater (not shown)
to a temperature above the glass transition point of the resin film 9. In the present embodiment,
since PEI (polyether imide) is used for the resin film 9, the heating temperature of the first mold
5 and the second mold 7 is from the glass transition point (220 ° C.) of PEI. The high
temperature was 230 ° C.
[0019]
Next, in the second step, as shown in FIG. 2, the first mold 5 and the second mold 7 are clamped.
At this time, the resin film 9 is in contact with the convex portion 6 of the second mold 7, and the
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5
resin mold 9 starts to be softened by the heat carried by the first mold 5 and the second mold 7.
Then, by sucking air from the back pressure hole 11, the softened resin film 9 is brought into
close contact with the forming die 8 to a certain extent. Here, the first outer shell 12 and the
second outer shell 14 are in contact via the resin film 9 to form a sealed chamber 15 between the
first mold 5 and the second mold 7. doing.
[0020]
Then, in the third step, compressed air is generated in the chamber 15 sealed by the air blown
out from the duct 13 provided in the convex portion 6 provided in the second mold 7, and the
pressure of this compressed air is further generated. The resin film 9 is closely attached to the
mold 8. As a result, the shape of the mold 8 is transferred to the resin film 9. Further, at the time
of molding, a stress is generated in the resin film 9 in the direction of the duct 13 which ejects
air, so the outer periphery of the resin film 9 is drawn to some extent from the outside of the
chamber 15.
[0021]
Finally, after the temperature of the resin film 9 is lowered to the glass transition point or less,
the first mold 5 and the second mold 7 are opened. Furthermore, air is jetted from the back
pressure hole 11, and the resin film 9 to which the shape of the mold 8 has been transferred is
peeled off from the first mold 5. As a result, a speaker diaphragm having a desired shape can be
obtained.
[0022]
Hereinafter, the effects of the method of manufacturing the speaker diaphragm in the
embodiment of the present invention will be described.
[0023]
First, in the method of manufacturing the speaker diaphragm in the embodiment of the present
invention, productivity can be enhanced.
[0024]
This is because the speaker diaphragm was manufactured with the second mold 7 provided with
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the convex portion 6.
[0025]
That is, the resin film 9 is drawn into the deep drawn portion 10 in advance by the convex
portion 6 by the time of molding shown in FIG. 3, and it is possible to prevent the resin film 9
from extending excessively when the air is jetted from the duct 13 .
That is, it is not necessary to stretch and form the resin film 9 little by little by multi-stage
molding as in the conventional method for manufacturing a speaker diaphragm, and productivity
can be enhanced.
[0026]
Moreover, it is desirable to provide the duct 13 for blowing out air in the convex part 6.
This is because the resin film 9 can be uniformly adhered to the deep drawn portion 10 located
above the convex portion 6 at the time of molding by blowing air from the duct 13 provided to
the convex portion 6, and the deep drawn portion 10 The shape of the toner can be sufficiently
transferred to the resin film 9.
Furthermore, the duct 13 is provided in the convex portion 6 and air is jetted to generate stress
in the resin film 9 in the direction of the convex portion 6, and the resin film 9 can be drawn
inside from the outside of the chamber 15. As a result, the possibility of damage due to the resin
film 9 being stretched too much can be reduced, and the quality of the speaker diaphragm can be
secured.
[0027]
Further, in the method of manufacturing the speaker diaphragm in the embodiment of the
present invention, the temperature of the first mold 5 and the second mold 7 at the glass
transition temperature of the resin film 9 or more prior to the first step. It is heated to As a
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result, the sheet-like resin film 9 is softened as the first mold 5 and the second mold 7 approach
in the second step, and in the third step, the resin film 9 has a glass transition point or higher. It
becomes possible to transfer the shape of the mold by reaching the temperature. Therefore, the
productivity of the speaker diaphragm can be improved.
[0028]
The heating of the first mold 5 and the second mold 7 is performed by a heater disposed on the
back of the first mold 5 and the second mold 7. Therefore, in the second and third steps, since
the first mold 5 and the second mold 7 are separated from the fixed heater, the first mold 5 and
the second mold are gradually removed. The temperature of 7 is decreasing. As a result, in the
third step, the temperature of the first mold 5 and the resin film 9 becomes a temperature below
the glass transition point, and the resin film 9 solidifies in a state in which the shape of the mold
8 is transferred. That is, in the method of manufacturing the speaker diaphragm in the
embodiment of the present invention, a resin plate can be manufactured at low cost without
requiring a device for cooling the resin film 9, and the speaker diaphragm is manufactured. It is
possible to improve the quality.
[0029]
Further, in the method of manufacturing the speaker diaphragm in the embodiment of the
present invention, the pressure applied to the resin film 9 is 0.8 MPa or more. That is, by forming
the pressure applied to the resin film 9 as 0.8 MPa or more, the resin film 9 can be more firmly
adhered to the forming die 8 and the deep drawn portion 10, and the forming die 8 has a
complicated shape. It is also possible to mold with high accuracy. As a result, the occurrence of
defects in the speaker diaphragm can be suppressed, and productivity can be improved.
[0030]
As described above, according to the method of manufacturing the speaker diaphragm in the
embodiment of the present invention, since the productivity can be enhanced, it is particularly
useful in the manufacture of a small speaker diaphragm that often uses a resin film. It is.
[0031]
Further, according to the method of manufacturing the speaker diaphragm in the embodiment of
the present invention, it is possible to provide a speaker diaphragm excellent in quality.
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Therefore, the speaker manufactured by the method of manufacturing the resin plate of the
present invention It is possible to improve the quality of the speaker using the diaphragm and
the electronic device using the speaker.
[0032]
According to the resin plate manufacturing method of the present invention, the productivity of
the speaker diaphragm can be improved, and in particular, the speaker diaphragm having a small
and complicated shape or the speaker diaphragm having a deep diaphragm shape. Useful for
production.
[0033]
The sectional view of the forming machine in the first step of the method of manufacturing the
speaker diaphragm in the embodiment of the present invention The sectional view of the forming
machine in the second step The sectional view of the forming machine in the third step Crosssectional view of a mold used in a method of manufacturing a resin plate
Explanation of sign
[0034]
DESCRIPTION OF SYMBOLS 5 1st mold 6 convex part 7 2nd mold 8 forming mold 9 resin film
10 deep drawing part 11 back pressure hole 12 first outer shell part 13 duct 14 second outer
shell part 15 chamber
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