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JPH05328489

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DESCRIPTION JPH05328489
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker edge used for various audio equipment and a method of manufacturing the same.
[0002]
2. Description of the Related Art Heretofore, the edge of a waterproof urethane foam used for a
door mount speaker for vehicle etc. has been constructed as shown in FIG. 4, FIG. 5, FIG. 6, and
FIG. That is, as shown in FIGS. 4 and 5, the edge 2 heat-pressed is applied or dipped in a
synthetic resin solution in a later step, and the skin layer 6 of the synthetic resin is attached to
the surface of the edge. As shown in FIG. 7, the penetration of water is prevented by providing
the synthetic resin film 7 on the surface when heat-press molding.
[0003]
However, in the above-described conventional configuration, the edge becomes heavy when the
skin layer 6 of synthetic resin is attached or the synthetic resin film 7 is provided only to prevent
the entry of water, and the sound pressure of the speaker is increased. There was a problem that
the Moreover, since the resin layer which prevents the penetration | invasion of water also in any
method is on the surface, when the surface was damaged by the accident of handling etc., the
subject that waterproofness was lost occurred. Furthermore, in the above-described conventional
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configuration, there is also a problem that the number of steps of manufacturing the edge is two
and the manufacturing cost is increased.
[0004]
An object of the present invention is to solve the above-mentioned conventional problems, and to
provide a speaker edge capable of exhibiting excellent waterproof performance and a method of
manufacturing the same.
[0005]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention is to form an edge by heat-pressing a urethane foam sheet having a fluorine-containing
synthetic resin attached at its end.
[0006]
In addition, in order to uniformly attach the synthetic resin having a fluorine group at the end to
the entire urethane foam, the foamed sheet obtained by slicing the pan foam of urethane is
impregnated with the emulsion liquid of the synthetic resin having a fluorine group at the end
Then, the sheet obtained by filling the emulsion liquid in most bubbles of the foamed urethane
and drying the sheet is hot-pressed and made into an edge for a speaker.
[0007]
[Function] A synthetic resin having a fluorine group at the end is water repellant, and since it
adheres to a very small amount of urethane foam can satisfy the waterproof performance as an
edge, the weight of the edge does not increase. .
Moreover, since the whole urethane foam which an edge comprises has waterproof performance,
waterproofness will not be lost by the flaw of handling, etc.
[0008]
In addition, since the synthetic resin having a fluorine group at the end is attached at one time at
the stage of the foamed urethane sheet before the molding of the edge, the manufacturing
process does not become two processes, and the manufacturing cost does not increase.
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[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A speaker edge according to an
embodiment of the present invention will be described with reference to the drawings.
[0010]
FIG. 1 is a perspective view showing the structure of a speaker edge according to the present
invention, and FIG. 2 is an enlarged cross-sectional view of the relevant part.
In FIG. 1, FIG. 2, the edge 2 obtains the continuous slice sheet with a thickness of 7 mm from the
bread foam 4 (density 0.030 g / cm <3>) of polyester-type polyurethane resin.
This sheet is impregnated with a 5-fold diluted aqueous solution of an emulsion of acrylic resin 5
having a fluorine group at the end (Dick Guard F-400 manufactured by Dainippon Ink and
Chemicals, Inc.).
At this time, the sheet is compressed in the liquid so that most of the bubbles 3 of the urethane
foam are filled with the emulsion liquid, and the air in the bubbles 3 is released.
The sheet is then compressed to squeeze out the emulsion to speed up the drying of the liquid.
After heat-drying the sheet, it is press-molded for 30 seconds in a press die heated to 200 ° C.
to obtain a roll-shaped edge 2 molded product having a thickness of 0.8 mm as shown in FIG.
This is attached to the outer peripheral edge of the diaphragm 1 to form a speaker diaphragm.
[0011]
With regard to the speaker edge configured as described above, as shown in FIG. 3, a cylinder 8
is disposed on the back of the edge 2 via a packing 9, and water 10 is stored in this cylinder 8
with a minimum water depth of 30 mm 96 As a result of the waterproof test for leaving it for a
while, no water leak occurred. Furthermore, after rubbing the edge surface 5 times at a pressure
of 500 g / cm on a part of the edge 2 with a # 400 sandpaper, the same waterproofing test was
performed but no water leakage occurred.
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[0012]
As described above, the edge of the speaker according to the present invention has the weight of
the edge because it is formed by heat pressing and forming the urethane foam sheet in which the
synthetic resin having the fluorine group at the end is attached to the inner wall of the bubble.
The waterproof performance can be effectively obtained without increasing the manufacturing
process of the edge, and the industrial value is great.
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