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JP2006217519

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DESCRIPTION JP2006217519
An object is to provide a speaker diaphragm and a method of manufacturing the same, which is
lightweight and has high sensitivity and can reduce the amount of filler when using a filler while
maintaining good characteristics of woven fabric. . A speaker diaphragm is configured such that
first and second molded bodies in which woven fabrics knitted by warp yarns and weft yarns are
formed into a predetermined shape are overlapped such that the knitting direction of each other
is inclined at a predetermined angle. It is configured. According to a method of manufacturing a
speaker diaphragm, a molding step of molding a first molded body and a second molded body
from a woven fabric knitted with warp and weft threads, a first molded body molded in the
molding step, and And an overlapping step of overlapping the second molded body such that the
knitting direction is inclined at a predetermined angle. [Selected figure] Figure 1
Speaker diaphragm and method of manufacturing speaker diaphragm
[0001]
The present invention relates to a speaker diaphragm and a method of manufacturing the same,
and in particular, a speaker diaphragm and a speaker diaphragm manufactured by molding a
woven fabric using a woven fabric in which warp yarns and weft yarns are woven by plain weave.
It relates to the method.
[0002]
The speaker diaphragm should not be breathable because it vibrates the air to produce sound.
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Therefore, a method of forming a speaker diaphragm by heating and forming the woven fabric
into a predetermined shape by using a woven fabric in which the warp and the weft are woven in
a plain weave, and forming it between adjacent warps and wefts The fabric may be impregnated
with a sealant for the purpose of closing the fine pores which are the fine pores. As the filler, for
example, a thermosetting resin is used, and a liquid thermosetting resin is impregnated into the
woven fabric before heat molding, and the thermosetting resin is cured simultaneously with the
molding of the woven fabric. (3) Add rigidity to the molded product and close the weave (see, for
example, Patent Document 1).
[0003]
Also, conventionally, in order to close the weave, the woven fabric is heat-formed to be formed
into a predetermined shape, and then a sheet made of another material such as paper, PP
(polypropylene), or a foam material is formed on the back of this formed body. There is also a
method of sticking and closing the weave.
[0004]
JP 2001-169387 A
[0005]
However, in the method of impregnating the woven fabric with the sealant and closing the
texture, since the woven fabric woven in the plain weave has a relatively large texture, it is
technically difficult to impregnate the sealant with the liquid sealant. Difficult to
Further, if this can be realized, a large amount of a blocking agent is required to close the weave,
so that the diaphragm becomes heavy and the sensitivity of the speaker becomes worse.
[0006]
On the other hand, in the method of attaching a sheet of another material to close the weave,
there is a problem that the good characteristics of the woven fabric are lost and the sensitivity of
the speaker is deteriorated.
[0007]
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The present invention has been made in view of the above, and it is possible to easily close the
weave, and while keeping the good characteristics of the woven fabric, it is possible to make it a
lightweight, sensitive, and excellent rigidity speaker diaphragm And a method of manufacturing a
speaker diaphragm.
Another object of the present invention is to provide a speaker diaphragm and a method of
manufacturing the speaker diaphragm, which can reduce the amount of the filler when the filler
is impregnated.
[0008]
In order to solve the problems described above and to achieve the object, the speaker diaphragm
according to claim 1 of the present invention comprises first and second woven fabrics in which
warp and weft yarns are woven into a predetermined shape. The molded articles are
characterized in that they are superimposed on each other such that the directions of knitting of
the molded articles are inclined at a predetermined angle.
[0009]
In the method of manufacturing a speaker diaphragm according to a ninth aspect of the present
invention, there is provided a molding step of molding a first molded body and a second molded
body from a woven fabric knitted by warp and weft yarns; And an overlapping step of
overlapping the formed first molded body and the second molded body so that the knitting
direction is inclined at a predetermined angle.
[0010]
Hereinafter, an embodiment of a loudspeaker diaphragm and a method of manufacturing the
loudspeaker diaphragm 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 will
be described as an embodiment, and then an embodiment relating to a speaker diaphragm and a
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method for manufacturing the speaker diaphragm will be described.
[0011]
Embodiment 1 In the speaker diaphragm of Embodiment 1, the first and second molded bodies in
which a woven fabric woven with warp and weft is formed in a cone shape have a cross direction
of approximately 45 in each other. It is made to overlap so that it is inclined in a way.
According to this configuration, since the woven fabrics of the respective moldings overlap
approximately 45 degrees, the two moldings overlap each other so as to close the weave formed
between the warp and the weft of the other moldings. For this reason, it is possible to easily close
the weave and to obtain a lightweight, sensitive and excellent rigid diaphragm while maintaining
the good characteristics of the woven fabric.
[0012]
The angle at which the first and second molded bodies are superposed may not be 45 degrees,
and a predetermined effect can be obtained even at, for example, about 10 degrees. However, the
45 ° case can most effectively close each other's eyes.
[0013]
Further, the shape of the molded body to be superimposed, that is, the shape of the diaphragm is
not limited to the cone shape, and may be a dome shape. Further, the number of moldings to be
superposed is not limited to two, and may be three or four.
[0014]
Second Embodiment In the speaker diaphragm of the second embodiment, the first and second
molded bodies in which a woven fabric woven with warp and weft is formed in a cone shape have
a cross direction of approximately 45 in each other. It is piled up in a slanting manner, and resin
is impregnated between the warp and the weft of both moldings and between both moldings.
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This construction makes it possible to completely and easily plug the weave with a very small
amount of resin (filler).
[0015]
The resin impregnated between the warp and the weft of the first and second molded bodies may
not necessarily be impregnated into both molded bodies, and it is at least one of them if the
purpose is to eliminate air permeability. It should just be impregnated.
[0016]
In addition, even in the case of a resin (adhesive) impregnated between two molded bodies, it is
not always necessary. If a resin is impregnated between the two molded bodies, the adhesion
between the two molded bodies is enhanced and the characteristics are improved. In addition to
being able to improve, it is possible to obtain an effect that desired rigidity can be easily
obtained.
In addition, it is possible to close the weave with a resin (adhesive) impregnated with a resin
between the two molded bodies.
[0017]
FIG. 1 is a front view for explaining the structure of a speaker diaphragm according to an
embodiment of the present invention. In FIG. 1, A1 shows the appearance of the speaker
diaphragm 50 viewed from the front, and shows the appearance of the surface of the first
molded body 10. A2 shows an enlarged view of a part of A1. A3 shows an enlarged view of a part
of A2. On the other hand, B1 shows the appearance of the speaker diaphragm 50 viewed from
the rear, and shows the appearance of the surface of the second molded body 20. B2 shows an
enlarged view of a part of B1. B3 shows an enlarged view of a part of B2. C1 shows the speaker
diaphragm 50 as viewed from the front. C3 shows an enlarged view of a part of C1.
[0018]
Each of the first molded body 10 and the first molded body 20 is manufactured by molding a
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plain-woven woven fabric. The plain weave woven fabric is a woven fabric in which the warp
yarns 8 and the weft yarns 9 cross at right angles.
[0019]
The speaker diaphragm 50 is manufactured by bonding the first molded body 10 and the second
molded body 20 together. And, as well represented by A3, B3 and C3, when the first molded
body 10 and the first molded body 20 are put together, the weave directions (weaving direction)
are mutually inclined 45 degrees. It is piled up. According to this configuration, the first molded
body 10 and the first molded body 20 overlap at an angle of 45 degrees and overlap each other
so as to close the weave formed between the warp and the weft of the other molded body. For
this reason, while being able to close a weave easily and leaving the good characteristic of woven
fabric, it can be set as the lightweight lightweight speaker diaphragm 50 with high sensitivity
and excellent rigidity.
[0020]
FIG. 2 is a schematic view for explaining the method of manufacturing the speaker diaphragm of
this embodiment. [First Molded Body Forming Step] First, the plain weave woven fabric 1 a is
supplied from the raw material supply device 1. The woven fabric 1a is prepared by being wound
around the feeding device 1 in the form of a roll, and is fed from the feeding device 1 with the
weave direction (weaving direction) directed to a predetermined direction. Next, in order to
prevent deformation at the time of molding, both sides with respect to the feeding direction of
the delivered woven fabric 1a are movably supported by the clamp 2. Next, a thermosetting resin
is supplied to the woven fabric 1a from a resin supply means (not shown), and then the woven
fabric 1a supplied with the resin is hot-pressed by the lower mold 3L and the upper mold 3U.
The resin is rolled and impregnated into the entire woven fabric 1a, and the impregnated resin is
semi-cured. Thereafter, die cutting and peripheral cutting are performed to obtain the first
molded body 10.
[0021]
Second Molded Body Forming Step On the other hand, the second molded body 20 is
manufactured in the same process as the first molded body 10. The plain weave woven fabric
21a is prepared by being wound around the supply device 21 in the form of a roll, and is fed
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from the supply device 21 with the weave direction (weaving direction) inclined 45 degrees with
respect to that of the woven fabric 1a. Next, in order to prevent deformation at the time of
molding, both sides with respect to the feeding direction of the delivered woven fabric 21a are
movably supported by the clamps 22. Next, a thermosetting resin is supplied to the woven fabric
21a from a resin supply means (not shown), and then the woven fabric 21a supplied with the
resin is hot pressed by the lower mold 23L and the upper mold 23U. The resin is rolled and
impregnated into the entire woven fabric 21a, and the impregnated resin is semi-cured.
Thereafter, die cutting and peripheral cutting are performed to obtain the second molded body
20.
[0022]
[Superposition Step] Next, the first molded body 10 and the second molded body 20 are set
between the upper mold 4U and the lower mold 4L. Here, the first molded body 10 and the
second molded body 20 are superimposed so that the weave direction (weaving direction) of
each other is inclined 45 degrees. Then, the first molded body 10 and the second molded body
20 are integrated by heat pressing, and the intermediate molded body 30 is obtained.
[0023]
[Edge Portion Forming Process] The edge material 11 a is supplied from the edge raw material
supply device 11. The edge material 11a is also rolled and prepared in the supply device 11, and
is delivered from the supply device 11 according to the flow of the process. Next, the edge
material 11 a is cut into an appropriate length by the cutting blade 12. Thereafter, molding is
performed by heat pressing with the lower mold 13L and the upper mold 13U, and die cutting
and inner / outer circumference cutting are further performed to obtain an edge portion 40.
[0024]
[Edge Integration Step] Subsequently, the intermediate molded body 30 and the edge 40 are set
between the upper mold 5U and the lower mold 5L, and the thermosetting resin is completely
cured by hot pressing, and the intermediate Integration of the molded body 30 and the edge
portion 40 is performed, and the speaker diaphragm 50 is obtained.
[0025]
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Here, the first formed body forming step and the second formed body forming step constitute a
forming step of forming the first formed body 10 and the second formed body 20.
In the method of manufacturing the speaker diaphragm of such a configuration, a molding step
of molding the first molded body 10 and the second molded body 20 from the woven fabric 1a,
21a knitted by warp and weft, and the molding step And superposing the first molding body 10
and the second molding body 20 molded in the first and second molding bodies so that the
knitting direction is inclined at a predetermined angle (45 degrees). It is possible to easily
manufacture the speaker diaphragm 50 in which the second molded bodies 10 and 20 are
superimposed on each other such that the knitting directions of the second molded bodies 10
and 20 are inclined at a predetermined angle.
[0026]
In the speaker diaphragm 50 of the present embodiment, the thermosetting resin is impregnated
for the purpose of closing the weave and strengthening the rigidity, but the first and second ones
may be used even if the resin is not impregnated. The thermosetting resin may be removed if the
air permeability is lost and the predetermined rigidity is obtained after the molded bodies 10 are
stacked.
[0027]
Although the woven fabric 1a and the woven fabric 21a of the present embodiment are knitted
with the same fibers, they may be different from each other.
That is, the fibers of the first molded body 10 and the second molded body 20 may be different.
As an example, KeplerTM fibers are used for the fibers of the first molded body 10, and carbon
fibers are used as the fibers of the second molded body 20. By this configuration, it is possible to
combine the good characteristics of both fibers, and to obtain a strong and light speaker
diaphragm.
[0028]
Although the speaker diaphragm 50 of the present embodiment is a cone type diaphragm, the
same effect can be obtained even if it is a dome type without being limited to the cone type.
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[0029]
Further, although the speaker diaphragm 50 of the present embodiment is a diaphragm in which
the edge portion 40 molded in a separate process is integrally heat-molded by a heat press, the
speaker diaphragm 50 does not mold the edge in another process For example, in a diaphragm in
which a cone portion and an edge portion are molded at one time and a diaphragm in which the
edge portion is not formed, it goes without saying that the edge portion molding and the process
edge portion integration process are naturally excluded.
[0030]
Furthermore, if the first molded body 10 and the second molded body 20 have the same shape
and a true circular molded body, one of the two molded bodies produced from the same mold is
45 ° After rotating, they may be superimposed.
By adopting such a manufacturing method, the number of molds (molds) can be reduced, and
therefore, cost reduction can be achieved.
[0031]
Conversely, if the first molded body 10 and the second molded body 20 are molded by different
molds (molds) as in this embodiment, an elliptical diaphragm or an eccentric diaphragm is used.
Even if it can produce.
Further, in consideration of mass productivity and a balance between processes, it is preferable
that the first molded body 10 and the second molded body 20 be molded by different molds
(molding molds).
[0032]
In addition, for example, an acrylic paint and a urethane paint can be used as an adhesive used
for the purpose of closing the weave and an adhesive used for the purpose of bonding the two
stacked molded bodies.
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[0033]
As described above, the speaker diaphragm according to the present invention and the method of
manufacturing the same are useful for general speaker diaphragms, and particularly suitable for
lightweight and highly sensitive speaker diaphragms.
[0034]
It is a front view for demonstrating the structure of the speaker diaphragm of the Example of this
invention.
It is a schematic diagram explaining the manufacturing method of the speaker diaphragm of the
present Example of this invention.
Explanation of sign
[0035]
1a, 21a woven fabric 3L lower mold 3U upper mold 4L lower mold 4U upper mold 5L lower
mold 5U upper mold 8 warp 9 weft 10 first molded body 13L lower mold 13U upper mold 20
second molded body 23L lower mold 23U upper mold 30 intermediate molded body 40 edge
portion 50 speaker diaphragm
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