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JP2007295110

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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 JP2007295110
An object of the present invention is to obtain a speaker diaphragm capable of shortening
manufacturing time and cost. A speaker diaphragm 1 has a first resin layer 2 formed inside and a
second resin layer 3 formed on the surface. The speaker diaphragm 1 is obtained by meltkneading the first resin 2 having a low melt flow rate and the second resin 3 having a higher
melt flow rate than the first resin 2, and the temperature of the produced mixture is higher than
that of the mixture It is manufactured by injecting into a low mold 20 of [Selected figure] Figure
1
Speaker diaphragm and method of manufacturing the same
[0001]
The present invention relates to a speaker diaphragm, and more particularly to a speaker
diaphragm manufactured using a resin as a material and a method for manufacturing the same.
[0002]
Heretofore, in the case of using a resin and a speaker diaphragm, for example, a multilayer
speaker diaphragm having a plurality of layers has been proposed for the purpose of improving
the structural strength.
In producing the multilayer speaker diaphragm, a multilayer injection molding method is
conventionally used. According to this method, for example, the molding material is disposed on
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the surface layer side of the speaker diaphragm, the core material is disposed on the inside side,
and the cross section after molding of the speaker diaphragm is formed into a three-layer
structure. Thus, the structural strength of the speaker diaphragm can be increased (see, for
example, Patent Document 1).
[0003]
JP-A-9-235936
[0004]
However, in the multi-layer injection molding method proposed in Patent Document 1 described
above, resin materials are respectively prepared for the two cylinders, and molding is performed
while switching between the two cylinders.
In this method, since it is necessary to perform filling and holding for each of the two cylinders,
not only the control is complicated but also the molding time is long and improvement is
required.
[0005]
The present invention has been made to solve the above-mentioned problems, and a speaker
diaphragm of a three-layer structure can be produced from two kinds of materials in one filling
and holding operation, and the production time is short. A speaker diaphragm that can be
shortened and reduced in cost, can be designed with high designability, or can be easily
connected to other members, and a method of manufacturing the same. Do.
[0006]
In order to solve the above-mentioned subject, the speaker diaphragm concerning this invention
is produced by injection-molding two kinds of resin in which melt flow rates differ, and the 1st
resin layer with low melt flow rate is formed in an inside. And a second resin layer having a melt
flow rate higher than that of the first resin layer is formed on the surface.
[0007]
Moreover, in order to solve the above-mentioned subject, the manufacturing method of the
speaker diaphragm concerning this invention is a manufacturing method of the speaker
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diaphragm in which the 1st resin layer was formed in the inside, and the 2nd resin layer was
formed in the surface. And melt-kneading a first resin having a low melt flow rate and a second
resin having a melt flow rate higher than the first resin, and forming the mixed material in a mold
having a temperature lower than that of the mixed material. It is characterized by being
manufactured by injection.
[0008]
Hereinafter, embodiments of a speaker diaphragm and a method of manufacturing the same
according to the present invention will be described in detail.
The present invention is not limited by the embodiment.
In the following, the outline and features of the speaker diaphragm of the present invention and
the method of manufacturing the same will be described as an embodiment, and then an example
regarding the speaker diaphragm and the method of manufacturing the same will be described.
[0009]
[Embodiments] Embodiment 1.
The speaker diaphragm of the first embodiment is formed in a three-layer structure by injection
molding two types of resins having different melt flow rates. Then, a first resin layer having a low
melt flow rate is formed inside, and a second resin layer having a melt flow rate higher than that
of the first resin layer is formed on the surface. In the speaker diaphragm of the present
embodiment, the first resin layer is made of a colored resin, and the second resin layer is made of
a transparent resin. That is, it comprises an intermediate layer made of a colored resin and a pair
of skin layers made of a transparent resin that covers the intermediate layer from the front side
and the back side. Therefore, the designability is improved.
[0010]
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Further, the method of manufacturing the speaker diaphragm according to the present
embodiment is a method of manufacturing the speaker diaphragm in which the first resin layer is
formed inside and the second resin layer is formed on the surface, and the melt flow rate It
manufactures by melt-kneading a low 1st resin and 2nd resin whose melt flow rate is higher than
1st resin, and inject | pouring the produced | generated mixed material in the metal mold | die
whose temperature is lower than the said mixed material. By manufacturing in this manner, a
diaphragm having a three-layer structure can be manufactured from one of two kinds of
materials in one filling and holding operation, and the manufacturing time can be shortened and
the cost can be reduced.
[0011]
Second Embodiment The speaker diaphragm of the second embodiment is formed in a threelayer structure by injection molding of two types of resins having different melt flow rates, as in
the first embodiment. Then, a polypropylene resin is used as a first resin layer having a low melt
flow rate formed inside, and an amorphous resin is used as a second resin layer having a high
melt flow rate formed on the surface. Amorphous resin is a resin having a large solubility
parameter (SP value). Therefore, the reaction with the solvent or the adhesive is improved, and
the speaker diaphragm can be improved in adhesion. Further, the method of manufacturing the
speaker diaphragm of the present embodiment is performed by the same method as that of the
first embodiment. From such a thing, the speaker diaphragm of this embodiment can produce a
diaphragm having a three-layer structure from two kinds of materials in one filling and holding
operation, thereby shortening the manufacturing time and cost. While being able to reduce, it can
be set as the speaker diaphragm which makes it possible to connect with another member easily.
[0012]
Example 1 FIG. 1 is a cross section of a speaker diaphragm of Example 1 according to the present
invention. As shown in FIG. 1, the speaker diaphragm 1 has a three-layer structure. Then, a first
resin layer (intermediate layer) 3 is formed inside, and a second resin layer (skin layer) 2 is
formed on the surface. In the present embodiment, the intermediate layer 3 is made of a colored
resin and constitutes a colored resin layer. The skin layer 2 is made of a transparent resin and
constitutes a transparent resin layer. In the present embodiment, the thickness of the speaker
diaphragm 1 is 0.10 mm to 1.00 mm, and the thickness of the skin layer 2 is 0.01 mm to 0.20
mm. This dimension is a dimension which can make balance of the physical property of the
speaker diaphragm 1 favorable. In FIG. 1, the thickness of the speaker diaphragm 1 is enlarged
for easy understanding. In the produced speaker diaphragm 1, the central portion and the
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peripheral portion may be cut in the final step, as necessary.
[0013]
The speaker diaphragm 1 is manufactured to have a three-layer structure by utilizing the
difference in melt flow rate of two resins constituting the colored resin layer and the transparent
resin layer. That is, a three-layer structure is produced by melt-kneading a colored resin and a
transparent resin having different melt flow rates, and injection-molding the melt-kneaded resin
mixture with an injection molding machine. The manufacturing method will be described below.
[0014]
FIG. 2 is a schematic view of an injection molding machine for manufacturing the speaker
diaphragm 1 of FIG. 1 of the present embodiment. The clamping pressure between the movable
side mold 21 held by the movable platen 24 of the mold 20 in the injection molding machine
100 and the stationary side mold 22 held by the fixed platen 25 is controlled by the mold
clamping pressure control unit 30. It is controlled by the mold clamping cylinder 10.
[0015]
An injection port of an injection device 40 for injecting a resin mixture material obtained by meltkneading a colored resin and a transparent resin is inserted into the injection port of the fixed
side mold 22. The injection device 40 is controlled by the injection conditions controlled by the
injection process control unit 31.
[0016]
When injection molding starts, as shown in FIG. 2, the mold clamping cylinder 10 first closes the
movable mold 21 and the fixed mold 22 of the mold 20, and toward this, the cylinder 41 of the
injection device 40 A resin mixture of a colored resin and a transparent resin is injected through
the same.
[0017]
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(1) Material Feed FIG. 3 is a detailed sectional view of the cylinder 41 provided in the injection
device 40. As shown in FIG.
In FIG. 3, a screw 43 is disposed along the central axis inside the generally cylindrical cylinder
41, and rotation of the screw 43 transfers the introduced resin material into the mold. It is
supposed to be. The material input port is provided with a hopper 42 for facilitating the input. As
shown in FIG. 3, the colored resin material 3 and the transparent resin material 2 which are
compounded in advance in an arbitrary compounding amount are charged into the hopper 42.
[0018]
(2) Melting and Kneading FIG. 4 is a detailed cross-sectional view showing how the resin mixture
is transferred in the cylinder 41. As shown in FIG. The colored resin material 3 and the
transparent resin material 2 supplied from the hopper 42 are simultaneously melt-kneaded while
being transferred by the screw 43 in the cylinder 41, as shown in FIG.
[0019]
(3) Mold Filling FIG. 5 is a cross-sectional view showing how the resin mixture that has entered
the mold 20 is being filled into the mold. The resin mixture transferred from the cylinder 41 is
injected into the mold 20 from the position of the arrow in FIG. 5 and gradually filled into the
mold. The temperature of the resin mixture is maintained at about 245 ° C. in the cylinder 41.
In addition, the temperature of the cavity surface of the mold 20 is maintained at about
30.degree. The clamping pressure by the mold clamping cylinder 10 controlled by the mold
clamping pressure control unit 30 is maintained at about 150 t. The thickness of the cavity
formed by the movable mold 21 and the fixed mold 22 of the mold 20 is about 0.3 mm. As
shown in FIG. 5, the resin mixture filled in the cavity between the movable mold 21 and the fixed
mold 22 is cooled from the portion in contact with the mold 20 and solidified to form the skin
layer 2. I will form it.
[0020]
(4) Solidification Molding FIG. 6 is a cross-sectional view showing how solidification of the resin
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mixture is completed in the mold 20. As shown in FIG. The transparent resin forming the skin
layer 2 has a higher melt flow rate than the colored resin forming the intermediate layer 3.
Therefore, in the portion where the resin mixture and the mold 20 are in contact, the resin
mixture is deprived of its temperature by the mold whose temperature is lower than the mixture
temperature, and the transparent resin having a high melt flow rate is cooled and solidified first.
First, the skin layer 2 made of the transparent resin is formed. Later on, the colored resin flows
between the skin layers 2 and is cooled and solidified to form the intermediate layer 3. Thus, the
speaker diaphragm 1 having a three-layer structure is formed.
[0021]
As described above, according to the method of manufacturing the speaker diaphragm of the
present embodiment, the speaker diaphragm having a three-layer structure can be manufactured
from one of two kinds of materials in one filling and holding operation. Shortening and cost
reduction can be done. Furthermore, since the first resin layer is made of a colored resin and the
second resin layer is made of a transparent resin, the designability is improved.
[0022]
A concrete example of the injection molding machine and the mixed resin material adopted in
this embodiment will be described. Polycarbonate is used as the transparent resin material (skin
layer) 2 and polypropylene is used as the colored resin material (intermediate layer) 3 The
blending ratio was 1:10. SG150 Sumitomo Heavy Industries, Ltd. was used as an injection
molding machine.
[0023]
Example 2 FIG. 7 is a cross-sectional view of a loudspeaker diaphragm according to Example 2 of
the present invention. As shown in FIG. 7, the speaker diaphragm 51 has a three-layer structure.
A first resin layer (intermediate layer) 53 is formed inside, and a second resin layer (skin layer)
52 is formed on the surface. In the present embodiment, the intermediate layer 53 is made of
polypropylene resin and constitutes a polypropylene resin layer. The skin layer 52 is made of an
amorphous resin and constitutes an amorphous resin layer. The thickness of the speaker
diaphragm 51 is 0.10 mm to 1.00 mm, and the thickness of the skin layer 52 is 0.01 mm to 0.20
mm. This dimension is a dimension which can make the balance of the physical properties of the
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speaker diaphragm 51 favorable. The speaker diaphragm 51 is manufactured by the same
manufacturing method as the speaker diaphragm 1 of the first embodiment.
[0024]
Amorphous resin is a resin having a large solubility parameter (SP value). That is, it indicates that
the material is easily soluble. By using this amorphous resin for the skin layer 52, the reaction
with the solvent and the adhesive is improved, and the adhesion is improved. Representative
examples of the amorphous resin include ABS resin, methacrylic resin and the like.
[0025]
In the speaker diaphragm 51 of the present embodiment, as in the case of Example 1, a
diaphragm having a three-layer structure can be produced from two types of materials in one
filling and holding operation. The manufacturing time can be shortened and the cost can be
reduced. Furthermore, since the first resin layer is made of polypropylene resin and the second
resin layer is made of non-crystalline resin, it is possible to easily connect with other members
without performing post-processing such as primer, corona treatment, plasma treatment, etc. It
can be made a speaker diaphragm which enables it.
[0026]
In addition, as the polypropylene resin (intermediate layer) 53 adopted in the present
embodiment, polypropylene with 10% mica is specifically used, and as the non-crystalline resin
(skin layer) 52, polycarbonate is specifically used, and the compounding ratio Is 10: 1.
[0027]
With regard to the mixed resin material, as described above, in Example 1, the transparent resin
material 2 and the colored resin material 3 are used, and in Example 2, the amorphous resin 52
and the polypropylene resin 53 are used.
However, the mixed resin material is not necessarily limited to this. On the other hand, in order
to make the speaker diaphragm into a three-layer structure, the following points regarding
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materials are limited. That is, the two resin materials must be resins having different molecular
structures and molecular weights, and the melting temperatures of the two resin materials must
be close to each other.
[0028]
The present invention is suitable for being applied to a speaker diaphragm, and is particularly
suitable for being applied to a speaker diaphragm or the like whose design is desired to be
improved.
[0029]
It is a cross section of the speaker diaphragm of Example 1 concerning this invention.
It is a schematic diagram of the injection molding machine for manufacturing the speaker
diaphragm of FIG. It is detail drawing of the cylinder provided in the injection device of the
injection molding machine. It is a detailed sectional view showing signs that a resin mixed
material is transferred within a cylinder. It is sectional drawing which shows a mode that the
resin mixture was filled in the type | mold. It is sectional drawing which shows a mode that
solidification shaping | molding of the resin mixture was completed in the metal mold | die. It is a
cross section of the speaker diaphragm of Example 2 concerning this invention.
Explanation of sign
[0030]
1, 51 speaker diaphragm 2 transparent resin material (skin layer, first resin) 3 colored resin
material (intermediate layer, second resin) 10 mold clamping cylinder 20 mold 21 movable side
mold 22 stationary side mold 24 Movable platen 25 Fixed platen 30 Pressure control unit 31
Injection process control unit 40 Injection device 41 Cylinder 42 Hopper 43 Screw 51 Speaker
diaphragm 52 Amorphous resin (skin layer, first resin) 53 Polypropylene resin (Interlayer,
second) Of resin)
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