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JPS6232799

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS6232799
[0001]
The present invention relates to a support such as an edge or a damper for supporting a
diaphragm in an electrodynamic speaker. 1 and I show the positions of edges, dampers and the
like in the conventional electrodynamic speaker shown in FIG. The magnet 1 is held between the
upper plate 2 and the lower plate 3, and the center ball 4 is placed on the lower plate 3 to
constitute a magnetic circuit. A voice coil bobbin 11 on which a voice coil 6 is wound is coupled
to a cone-shaped diaphragm 5 at a recess opening end, and a center cap 15 is mounted. The
opening edge of the diaphragm 5 is supported on the inner periphery of the opening of the
frame 8 fixed to the upper plate 2 via an edge 9, and a hook 10 fixes the periphery of the edge 9.
Further, the recess opening end of the diaphragm 5 is supported by the damper 7 fixed to the
frame 8 together with the voice coil bobbin 11. Thus, the edge and the damper support the outer
peripheral edge and the inner peripheral edge of the diaphragm 5, facilitate the movement of the
diaphragm 5 in the direction in which the voice coil bobbin 11 performs the piston movement,
and the direction perpendicular to the piston movement direction. It serves to suppress the
movement of the diaphragm 5. Conventionally, since the natural resonance of the edge affects
the flattening of the sound pressure frequency characteristic in the midrange of the speaker, a
method of applying a damping agent for damping the natural resonance of the edge to increase
the internal loss of the edge has been taken. Damping agents are conventionally limited to those
consisting of only a single resin such as an acrylic resin, urethane resin, etc., and nitrile rubber,
and in many cases, various resins are mixed and used mainly with a vinyl acetate synthetic resin.
There is. However, vinyl acetate resins have the disadvantage of deteriorating ff when they are in
intimate contact with a paper valve or cotton cloth over a long period of time. In addition, when a
damping agent made of a vinyl acetate resin is applied to an edge and dried and solidified, the
shape and physical properties of the solidified coating layer itself also change due to temperature
change. For example, when left for a long time in an environment of room temperature of 30 ░
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C. or higher, a phenomenon occurs in which a vinyl acetate resin flows and flows out to a joined
diaphragm, or gathers in a part of an edge. In particular, the use of a conventional dumping
agent has been difficult in a speaker in an environment where temperature changes are severe
such as when used for a car-mounted speaker. OBJECT AND SUMMARY OF THE INVENTION It is
an object of the present invention to provide a support for a speaker diaphragm with less change
over time over time. The support for the speaker diaphragm according to the present invention is
a support for a speaker imaging plate comprising a base molded into a predetermined shape, and
at least a solution of a dumping agent obtained by mixing a plasticizer and a chlorinated polymer.
A portion of the substrate is preferably attached to a flexible portion and dried.
1- ? -1 Below, an embodiment of the present invention will be described with reference to the
attached drawings. First, a cotton cloth is press-formed into a predetermined shape, for example,
a roll edge, by a conventional method so as to be an edge of a woofer having a diameter of 3
QCm, to prepare a substrate. FIG. 2 (a) is a partially enlarged cross-sectional view of a state in
which the roll edge-like substrate 21 obtained is adhered on the peripheral edge portion of the
diaphragm 22. FIG. This roll edge-like base 21 is, as shown in FIG. 2 (a), a diaphragm bonding
part 21a bonded to the peripheral part of the diaphragm, a flexible roll part 21b, and an opening
inner peripheral part of the frame. It consists of a frame bonding part 21C to be bonded. Next, a
solution comprising a plasticizer and a chlorinated polymer in proportions as shown in Table 1,
ie, a dump agent, is prepared. Table 1 The solution of the dumping agent is uniformly applied on
the roll portion 21b of the roll edge substrate 21. At this time, as shown in FIGS. 2 (a) and 2 (C),
the dumping agent 23 according to this embodiment is attached onto the roll portion 2Ib which
is a flexible portion, or FIG. 2 (b) or As shown in d), it is possible to apply the dumping agent 23
from the roll portion 21b to the peripheral portion of the diaphragm 22 on the diaphragm
bonding portion 21a or on the diaphragm bonding portion 2ia. 2 (a) and 2 (b) show a mode in
which the diaphragm bonding portion 21a is bonded under the peripheral portion of the
diaphragm 22, and FIGS. 2 (C) and 2 (d) vibrate the diaphragm bonding portion 21a. It shows an
aspect of bonding below the periphery of the plate 22. As described above, the dumping agent in
the present embodiment is uniformly applied to at least the flexible portion O-hole portion 21b.
When the dumping agent is applied, it may be applied directly to the roll edge substrate, or it
may be applied to a predetermined portion after bonding the roll edge substrate to the
diaphragm. Finally, after applying the dumping agent, the solvent component of the dumping
agent is dried by natural drying or heated air drying, etc., and the mixture of BPBG and
chlorinated polypropylene is uniformly fixed to the fibers of the roll edged substrate to obtain the
roll edge of this example. . FIG. 3 shows each of the electrodynamic speaker using the roll edge
according to the present embodiment and the vJ speaker manufactured using the O-edge
substrate which is not subjected to the treatment of the dumping agent coating according to this
embodiment. It is a graph which shows a sound pressure output frequency characteristic. In the
graph, the curve A indicates the one according to the roll edge of the present embodiment, and
the curve B indicates the one due to the untreated roll edge. As can be seen from FIG. 3, it is
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found that the electrodynamic speaker using the roll edge of the present embodiment has a
reduced influence of the inherent pregnancy of the edge in the middle to high frequency range.
Here, in the present embodiment, the dumping agent is applied to the surface of the roll edge
substrate by coating, but the dump agent may be applied to the concave back surface of the roll
portion 21b or the front and back sides of the straw. It can be soaked and impregnated with a
dumping agent to adhere. In addition, the components of the dumping agent in this example
were chlorinated polymer, plasticizer and solvent were respectively chlorinated polypropylene, BP-B-G (butyl- phthalyl-butyl Olycolate) and toluene as an aromatic organic solvent, but
chlorination For example, vinyl chloride may be used as the polymer, and DOP (dioctyl
phthalate), D BP (dibutyl phthalate), B L P (butyl-Iaaryl phthalat Q), 7 CP (tricresyl phosphate), [)
OA may be used as the plasticizer. (Dioctyl adipate), D O3 (dioctyl seb'acate), etc. may be used as
appropriate mixed, and as a solvent, for example, Emissions and methanol may be used to further
ester organic solvents and ketone-based organic solvent may be used an aromatic organic solvent
and an alcoholic solvent such as isopropanoyl tool. Generally, as a polymer, ie, a copolymer,
becomes a polymer matrix, it becomes difficult to dissolve in an organic solvent, but chlorination
with this polymer polarizes low polymer molecules and makes it easy to dissolve in a solvent. In
addition, when the plasticizer is added in 5 portions, a transition phenomenon may occur and the
adhesion effect may be reduced. The suspending of the plasticizer in the present invention is
carried out when the ratio of plasticizer: chlorinated polymer is in the range of 5 to 60: 100,
preferably 15 to 25: 100 by weight ratio to the amount of chlorinated polymer. Good adhesion
results are obtained. Further, although the roll edge is shown as a support of the diaphragm in
the speaker in this embodiment, the shape of the edge may be a corrugation type, an accordion
type or the like, and further, a diaphragm using a predetermined substrate of corrugation type
made of cotton cloth. The damper as the support of the present invention can be manufactured in
the same manner as the present embodiment. According to the present invention, according to
the present invention, the dry-cured novel dumping agent itself has suitable flexibility, heat
resistance up to about 100 ░ C., and does not corrode the fiber material. Because it has a cotton
fabric mainly composed of a fiber material, the dumping agent containing a plasticizer and a
chlorinated polymer is attached to at least a flexible portion of a substrate of a support formed
by molding a paper material into a predetermined shape. By doing this, it is possible to obtain a
support for a speaker diaphragm with less change over time.
[0002]
Brief description of the drawings
[0003]
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FIG. 11 is a partial cross-sectional view of an electrodynamic speaker, and FIG. 2 <a) or d ?) is a
partial enlarged cross-sectional view showing a mode in which a diaphragm and a roller are
adhered. FIG. An example of an electrodynamic speaker using a roll edge and a roll part not
subjected to processing of dumping agent application "A graph showing the sound pressure
output frequency characteristics of each of the electrodynamic speaker manufactured using a
wedge-like substrate .
Explanation of symbols of main parts 1 иии Magnet 2 и и и и Upper plate 3 и и и и и Lower plate 4 иии и и и
Center ball 5.22 и и и и Cone-shaped diaphragm 6 иии Voice coil 7 и и и и Damper 8 и и и и Frame 9 и и и и и и
и и и и и и и и и и и и и и и Gasket 11 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Dump material
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