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JPS58154998

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DESCRIPTION JPS58154998
[0001]
The present invention relates to a method for manufacturing a speaker diaphragm in which a
surface material is attached to the surface of a core material having a large number of
irregularities formed by vacuum, pressure or vacuum pressure forming of a thermoplastic resin
film. Another object of the present invention is to provide a method of manufacturing a speaker
diaphragm which can increase the strength without reducing the weight reduction so much. In
general, many speaker diaphragms are made of paper pulp by paper molding, and the diaphragm
shape is a cone type. Therefore, the position of the sound source is different between the inner
and outer peripheral portions of the speaker diaphragm, and there is a drawback that it is
difficult to obtain a speaker having a flat frequency characteristic because a phase difference can
be made. On the other hand, a loudspeaker having a flat diaphragm is free from the front room
effect found in a cone-type loudspeaker, and is advantageous for flattening the frequency
characteristic. In the case of a flat-plate speaker, when a conventional paper is used as a
diaphragm, since the rigidity against bending is small, divided vibration is likely to occur, and flat
characteristics can not be obtained over a wide band. A sandwich structure can be considered to
increase the bending rigidity in a flat plate. Until now, sandwich-type imaging plates mainly made
of aluminum honeycombs have been used in many cases, but aluminum honeycombs are costly
because they are complicated in the manufacturing process, and they are popular stereo
equipment. It is difficult to use as a speaker of a radio receiver, a television receiver or the like. In
order to obtain a diaphragm with a sand-inch structure at low cost, a thermoplastic resin film is
used as a core material having a large number of irregularities by vacuum, pressure or vacuum
pressure forming, and a surface material is attached to both sides of this core material to vibrate.
There is a way to make it a board. In this case, since the core material has a portion parallel to
the surface material, the surface material and the doubled part are not effective in terms of
weight. Therefore, the convex portion of the film formed to reduce the weight as the diaphragm
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and to increase the efficiency is cut. FIG. 1 shows a method of manufacturing a conventional
speaker diaphragm. In FIG. 1, 1 is a thermoplastic resin film and 2 is a molding die. The molding
die 2 has a concavo-convex pattern and a first die 3 having a suction hole at the bottom of the
recess, and the same pattern as the concavo-convex pattern of the first die 3 and the same size as
the four parts It is comprised by the overlapping body of 2nd metal mold | die 4 which has a
through-hole. Then, in this manufacturing method, as shown in FIG. 1A, the thermoplastic resin
film 1 which has been softened by heating in advance is made to face the molding die 2
described above, and suction is performed as shown in FIG. And the above first one. The
thermoplastic resin film is formed by the forming die 2 formed by combining the second die 3
and 4, and as shown in FIG. 1C, the second die 4 is removed after the first die 3 is removed. The
convex portion of the film protruding from the above is cut along the second mold 4 with a knife
blade or the like, and then, as shown in FIG. 1D, the surface materials 6, 7 are adhered to both
surfaces of the core material 5.
However, according to this method, although the weight of the diaphragm can be reduced, the
end face of the cut core material has a small bonding area with the surface material which is a
very thin film, and the bonding strength is weak. For this reason, there existed a problem that the
reliability as a speaker was not fully securable. The present invention eliminates such a
conventional defect, and a first mold having a concavo-convex pattern, and a through hole wider
than the width of the concave part of the first mold in the same pattern as the first mold. The
second mold has a combination of molds, which have a two-level recess as a whole, and this mold
is used to vacuum the thermoplastic resin film. The core material having a large number of
concavities and convexities is formed by air pressure or vacuum pressure air forming, and after
taking out the second metal mold of the molding die together with the core material formed, the
convex part of the core material protruding from the second metal mold is cut The core material
is formed by partially removing a portion parallel to the surface material, and thereafter, the
surface material is attached to both surfaces of the core material. According to this
manufacturing method, a part of the core material formed in two stages and protruding from the
second mold is cut by the second mold to partially cut a part parallel to the surface material.
Since it is possible to leave the parts at the same time and to remove unnecessary parts at the
same time, there is an advantage that the strength can be increased without much harm to the
weight reduction. Hereinafter, a method of manufacturing the speaker diaphragm of the present
invention will be described with reference to the drawings of the embodiments. 2 and 3 show an
embodiment of the present invention. In FIGS. 2 and 3, 11 is a thermoplastic resin film and 12 is
a molding die. The molding die 12 has a predetermined pattern consisting of concavo-convex
portions and a first die 14 having a suction hole 13 at the bottom of the recess, and the same
pattern as the predetermined pattern of the first die 14 and the above A combination of a second
mold 16 having a through hole 16 wider than the width of the recess of the first mold 14 is
provided, and has a two-stage recess 17 as a whole. Here, as shown in FIG. 3, the predetermined
pattern formed by the concavo-convex portions of the molding die 12 is formed by alternately
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arranging the concave portions 17 and the convex portions 18 which expand in the radial
direction in the circumferential direction. 17 has a two-stage structure. Specifically, a polyarylate
resin film having a thickness of 100 μm is used as the thermoplastic resin film 11, and this
polyarylate resin film is heated to about 350 ° C. to soften it and then softened as shown in FIG.
2A. In this state, as shown in FIG. 2, it was placed on a mold, and a putter / shaped core material
19 was formed which alternately has in the circumferential direction unevenness which sucks air
from the suction holes 13 and radially expands. .
After taking out the second mold 16 with the core material 19 formed in the second dimension
as shown in FIG. 0, the convex portion of the core material 19 protruding from the second mold
16 along the cutting line is cut with a knife blade. Then, the heartwood cut to a diameter of
28111 was taken out. The weight of this heartwood is 65! I1gであった。 Incidentally, the
weight of the core material according to the conventional molding method of vacuum forming
with a mold having a concavo-convex pattern in which concavo-convex parts expanding in the
radial direction are alternately arranged in the circumferential direction was 74 mg. As apparent
from this comparison, the core material of the present embodiment is lighter than the core
material formed by the conventional molding method. Next, a 20 μm thick film was used as a
surface material 20.21, a polyester film adhesive (30 μm thick) was used as an adhesive, and
heat ν pressure was adhered to the core material to form a diaphragm. The peel strength
between the surface material and the core material at this time was 760 g. Moreover, using the
core material 5 shape | molded by the conventional core material cutting method, the diaphragm
was produced by the same method and the peeling strength between surface material and core
material was measured. As a result, according to the present invention, as shown in the peel
strength of 150 fl or more, according to the present invention, unnecessary portions of the core
material can be removed and an adhesion margin with the surface material can be provided. It is
possible to increase the strength without much harm, and to provide a high-performance and
highly reliable speaker. In addition, the pattern of the core material is considered to be triangle 2
circle, rhombus, hexagon, oval, etc. in addition to the embodiment, and the arrangement method
is considered variously such as concentric circle, radial, etc. In either case, similar effects can be
obtained It is a thing. In addition, the size of the diaphragm can be applied to a large scaker or
woofer as well as the embodiment.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a process diagram for explaining a conventional method for manufacturing a speaker
diaphragm, and FIG. 2 is a process diagram for explaining an embodiment of a method for
manufacturing a speaker diaphragm of the present invention, FIG. The figure is a plan view of a
molding die used in the same method.
11 · · · · · · · · · · · · · · · · · · · · · · · thermoplastic resin film, 12 · · · · molding mold, 13 · · · · suction
holes, 14 · · · the first mold, 15 · · · ... through hole, 16 ... ... second mold 17 ...... double-recess, 19
..... core, 20, 21 ...... surface material. Name of Agent Attorney Nakao Toshio and 1 other person
Figure 1g1312 (!! //
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