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JPS58156298

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DESCRIPTION JPS58156298
[0001]
The present invention relates to a method of joining a speaker diaphragm and its edge. The
speaker edge has a fixed edge made of the same material as the pulp cone paper and made
integrally with the pulp cone, and a free edge made of a material different from the corn paper
and used in a separate step. . Among them, cloth, urethane, rubber or the like is used as the
material of the free edge, and after these sheet materials are formed and cut into a desired shape,
they are adhered around the diaphragm using an adhesive. As an adhesive used for adhesion |
attachment here, the paste-form thing which melt | dissolved resin, such as rubber type and an
acryl type, in a solvent conventionally generally is used. In such solvent layer adhesives, the solid
content is solidified due to the evaporation and scattering of the solvent, which causes adhesion.
However, in the case of adhesion using such hot #II Im adhesive, it has many inconvenient point
hairs. That is, (1) many steps of uniform spreading, adhesion, and drying of the adhesive are
required, and especially the drying step takes time, so mass productivity is poor and cost
increases, (2) using a solvent (G) When the diaphragm or edge is made of polyolefin resin,
polyester resin, polyamide resin, etc., there is no appropriate adhesive, so there is no chrome
bonding. It will not be practical unless it is subjected to extreme oxidation such as surface
oxidation in oxidation flame, plasma treatment, etc. (4) Deformation or deterioration or
appearance of diaphragm or edge due to “swell out” of solvent (5) It has many disadvantages
such as (5) partial adhesion unevenness occurs easily, and the quality on adhesion is not stable.
The present invention has been made in view of such a point, and has a speaker diaphragm
having many advantages such as processing in a very short time, high mass productivity,
improvement of working environment, and stability of bonding quality. It provides a method of
joining the edges. That is, the present invention focuses on the fact that the ultrasonic energy
softens and melts the thermoplastic resin relatively easily, and at least one of the speaker
diaphragm and its edge is made of the thermoplastic resin, or any of these. Using a material
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containing or adhering a thermoplastic resin, ultrasonic energy is applied to the junction of the
diaphragm and the edge to melt the thermoplastic resin, and then it is cooled and solidified to
obtain the diaphragm and the edge. Are joined together. Hereinafter, an outline of a bonding
method according to the present invention will be described using the drawings. FIG. 1 shows an
example of carrying out the method of the present invention. (1) is an ultrasonic oscillator for
driving an ultrasonic transducer (2).
(3) is a tool horn connected to the ultrasonic transducer (2) via a fixed horn (4), and the tip
thereof conforms to the inclined surface shape of the mold (5). (6) is a lowering mechanism for
lowering the vibrator (2), the fixed horn (4) and the tool horn (3) to the mold (5) side. (至) is a
diaphragm installed in the mold (5), and ■ is an edge attached to the outer periphery of the
diaphragm (至). The inclined surface of the mold (5) The diaphragm ■ and the edge αD are
provided overlapping each other at the location. Then, either the diaphragm portion or the edge
portion is made of a thermoplastic resin such as polypropylene, or the thermoplastic resin is
contained in or attached to either the diaphragm (edge) or the edge 0 . Then, the descent
mechanism (6) is operated to clamp and press the overlapping portion of the diaphragm (edge)
and the edge wedge with the tool horn (3) and the mold 6), and then the ultrasonic oscillator (1 )
To transmit the ultrasonic energy from the vibrator (2) to the bonding surface between the
diaphragm and the edge through the fixed horn (4) and the tool horn (3), and either of them Melt
the thermoplastic resin contained in or attached to the plastic resin, and then stop the oscillation
of the vibrator (accordingly, the molten portion is rapidly cooled and solidified to form the
diaphragm and the edge wedge Bond the overlapping portion of. At this time, the ultrasonic
welding time required to melt the resin is usually at most 3 seconds, and the time required to
stop the oscillation and cool and solidify the molten resin (retention time) is also 2-3 seconds.
The processing time is extremely short. Further, since dirt such as dust or oil adhering to the
surface of the adherend αGH is shaken off by ultrasonic waves, it is not necessary to pretreat the
bonding surface necessary for bonding with an adhesive. Furthermore, by adhering the tool horn
(3) to the adherend α (after pressure bonding to 1011 and causing oscillation (oscillation after
pressure), the adherend α (Ill) can be joined with high accuracy without deviation, and other
than the welded portion Since it does not generate heat, it has advantages such as no
deformation or deterioration of the product. The oscillation frequency is usually between 15 and
25 KHz. As a material of the tool horn (3), aluminum, iron, titanium or the like is suitable. The
embodiment of the present invention shown in FIG. 1 is a method of joining scissors when a
straight cone is used as a diaphragm portion, and in this case, the tool horn (3) has its contact
portion in accordance with the shape of the diaphragm (most). It is necessary to cut at an angle
to provide a slope, and some energy is required since there is some loss for vertical vibration.
On the other hand, FIG. 2 shows an embodiment in the case where the peripheral portion of the
diaphragm (2) of the straight cone is horizontally bent and the horizontal portion (2) k edge I is
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overlapped, and FIG. In the case of the diaphragm (2) of the cone, the energy of the tool horn (the
lower surface of the tool horn 31 can be made flat by making the peripheral portion (most) of the
diaphragm OG almost horizontal) As it acts on the joint between 2) and the edge of the edge,
energy loss is small, and design and processing of the horn (3) are easy and preferable. Specific
examples are shown below. [Example 1] Curved cone made of natural pulp having a diameter of
84φ-Polypropylene sheet molded into a shape to be superimposed on the vibrating plate
(mostly) with 5MI width around the vibrating plate (mostly) (200μm thickness) Ultrasonic Wells
(Brother Industries, Ltd.) (W-) having a vibrating diaphragm (made of aluminum) and an
aluminum tool horn (3) whose energy transfer surface is flat at the overlapping part of '111'
Ultrasonic welding was performed in 2016 5). The oscillation frequency of the ultrasonic welder
is 15 KHz and the output is 2 KW. The welding time is 1.5 seconds, the holding time is 3 seconds,
pressurization 30 #, and the oscillation method is oscillation after pressurization. When the
diaphragm portion and the edge 0 thus obtained were observed, they were firmly joined together
with the ring-shaped portion (51 w width) overlapped, maintaining the airtightness completely
without any displacement. In addition, no deformation or the like was found at the diaphragm in
the vicinity of the joint with the apex. Furthermore, in order to examine the adhesive strength of
the edge α of this joint, a bending (folding) peel test of 1800 was carried out, and the diaphragm
QG and the edge (company) were adhered by the conventional rubber adhesive. It was found that
the peel strength of this ultrasonic bonding was much higher as 1.29 / 3, while the peel strength
was 0, 5/3, and it was found to have sufficient practical strength. [Example 2] A 300 μm thick
sheet of polypropylene (70 Wt) as a base material and a composite material filled with carbon
fiber @ (15 wt%) and mica flakes (15 wt%) as a reinforcing agent is heat-treated. A diaphragm
(diameter) having a diameter of 120 mm, which is formed into a curved cone shape as shown in
FIG. 3 by the press forming method, is disposed as in the case of Example 1, and the
corresponding shape is formed on the periphery of the diaphragm (diameter). A 250 μ-thick
cloth edge I was similarly placed and ultrasonically welded with ultrasonic wells (W-20165). The
welding time was 2.5 seconds, the holding time was 6 seconds, the pressurization was 40 #, and
the oscillation method was oscillation after pressurization.
The obtained free-edge-joining diaphragm αG is tightly joined without interference at the ringshaped joint (width 4 m) with the edge I, maintaining the airtightness, and the diaphragm near
the joint with the edge I There was no deformation at all. When a 180 ° folding and peeling test
was performed to find the adhesive strength to the edge I, the peeling strength was 1.5 # / 3.
Furthermore, instead of the cloth edge I, a urethane edge having a thickness of 0.6101 was used,
and the welding conditions were made the same, and the same diaphragm (2) was joined, and its
peeling strength was measured to be 1,0 # / cs. there were. EXAMPLE 3 A styrene-butadiene
rubber (SBR) solution was roller applied to one side of a 200 .mu.m thick cloth, which was then
dried to allow SBR to adhere about 150 .mu. Then place the flat cone diaphragm made of pulp on
top of it, then place the SBR-coated cloth edge as described above on the bottom of the
diaphragm 00, and place it on the periphery of the diaphragm 00. Ultrasonic welding was
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performed at -20165). As shown in Fig. 1, the tool horn (3) has an outermost diameter of 84φ
and is used with the same taper as the shape of the diaphragm (d) so that pressure is uniformly
applied to the joint surface of the object to be welded. did. At this time, welding was carried out
in a state where air was depressurized and suctioned from the lower part of the joint surface. The
welding time is 2-0 seconds, the holding time is 3 seconds, the pressure is 40 kg, and oscillation
is performed after pressure. The bonded portion (511 II width) of the resulting adherend was
firmly bonded without displacement. In order to investigate the adhesion between this edge I and
the diaphragm, a 180 ° folding and peeling test was carried out. At the interface between the
diaphragm portion of the pulp cone and the SBR adhesive of the edge (9) Without, the diaphragm
(2) itself was torn (0.8 強度 / cWI breaking strength), which indicates that the connection
between the diaphragm head and the cloth edge (company) is perfect. As described above, in the
method of joining the edge and the diaphragm by ultrasonic welding, (1) the working time is
extremely short and the productivity is high, compared to the method using the conventional
adhesive, (2) No generation of harmful gases etc. No concern for pollution, (3) Pre-treatment of
adherend is unnecessary, (4) Most resins can be welded, (5) Products do not generate heat
except for welded parts It is extremely preferable because it has many advantages such as no
deformation / deterioration, (6) use of welds and no need for drying time. Furthermore, since the
thermoplastic resin which is melted to be the bonding material exhibits the fusion ability if it is
contained in either the diaphragm or the edge which is the adherend, the form of inclusion is
shown in the above-mentioned embodiment. In addition to film-like, matrix polymer
(reinforcement) of reinforcing agent, and coating table pick-up, it may be contained or formed in
any form such as fiber cloth or non-fiber cloth made of thermoplastic fiber, particulate matter,
foam etc. Any form can be applied as long as it is a unit.
As described above, according to the present invention, since the edge can be easily joined to the
diaphragm in a short time and the conventional problems can be solved at once, industrial value
is extremely high.
[0002]
Brief description of the drawings
[0003]
FIGS. 1 to 4 are cross-sectional views showing the formation of 41I in carrying out the method of
the present invention, respectively, and (1) emits ultrasonic waves.
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Figure 1 Figure 2
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