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JPH0486199

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DESCRIPTION JPH0486199
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker using a highly rigid diaphragm having good heat resistance and flame retardancy. 2.
Description of the Related Art Generally, the diaphragm of a speaker is made of a cellulose fiber
such as a valve, so it is a coil bobbin or a diaphragm that fires due to an abnormal temperature
rise of the voice coil. Problems to be Solved by the Invention With the loudspeaker having this
configuration, recently, the heat resistance of each component has been strongly improved or
incombustible in order to prevent an electric device or the like from igniting due to a failure etc.
and causing a fire. Although requested, this request was not satisfied at all, and it had no effect
on fire prevention. An object of the present invention is to provide a speaker which eliminates
the above-mentioned conventional drawbacks and exhibits a great effect in fire prevention.
Means for Solving the Problems In order to solve the problems, the present invention is mainly
based on phenolic resin fibers excellent in heat resistance and aromatic polyamide fibers high in
rigidity and good in heat resistance, and uniformly in a beater. The mixture is mixed, a binder
and a water resistant agent are added via polyethylene imine, and a diaphragm obtained by heat
forming after paper making is used. The above-mentioned phenolic resin fiber and aromatic
polyamide fiber have excellent heat resistance and flame retardancy, and mica powder and
aromatic polyamide fiber improve air permeability and at the same time increase the rigidity of
the diaphragm to make the phenolic resin The fibers improve tear strength and facilitate
papermaking. Polyethylenimine is a reactive resin that is effective in fixing the fibers and the
binder. The water resistant agent and the alkyl ketene dimer can improve the size and water
resistance of the diaphragm. EXAMPLES The present invention will be described with reference
to FIGS. 1 to 5 of the drawings. First, in FIG. 1, reference numeral 1 denotes a field portion, and
the field portion 1 is constituted by a plate 3 provided with a center pole 2, a ring-shaped magnet
4, and a ring-shaped upper plate 5. The field section 1 shown here is called an external magnet
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type, but an inner magnet type field section constructed by incorporating a columnar magnet or
a columnar magnet and a center ball in a yoke may be used. The frame 6 is connected to the field
portion 1, and the peripheral edge of the diaphragm 8 is connected to the peripheral edge of the
frame 6 together with the gasket 7. A voice coil 10 to be fitted into the magnetic gap 9 of the
field unit 1 is coupled to a central portion of the diaphragm 8, an intermediate portion of the
voice coil 10 is supported by a damper 11, and the voice coil 10 is The magnetic gap 9 is fitted
so as not to be decentered.
A dust cap 12 is attached to the upper surface of the central portion of the diaphragm 8. With
such a configuration, the diaphragm 8 functions as a diaphragm for 40 minutes or more without
igniting even in a temperature atmosphere around 300 ° C. to 350 ° C. Even if it is ignited, it
has a flame retardant effect which disappears immediately, and it is possible that it will not lose
its function as a diaphragm for more than 20 minutes even in a 400 ° C. temperature
atmosphere. That is, the diaphragm 8 of the present invention is mainly composed of an aromatic
polyamide fiber and a phenolic resin fiber which are organic fibers excellent in heat resistance,
and in some cases, a small amount of mica powder as a reinforcing material is added. The
mixture is homogeneously mixed, and a binder and a water resistant agent are added via
polyethylene imine, followed by paper forming and thermoforming. In addition, as a phenol resin
fiber, 40 to 60% (% by weight) of a fiber obtained by crosslinking phenol and formaldehyde resin,
30 to 50% (% by weight) of an aromatic polyamide fiber, and 0 for mica powder -15% (weight%)
is used. The binder used was an aqueous epoxy resin and a melamine resin, and an alkyl ketene
dimer was used as a water resistant agent. Next, various characteristics of the diaphragm
according to the speaker of the present invention and the diaphragm consisting of a conventional
craft valve will be compared. The diaphragm of the present invention uses 40% (wt%) of aromatic
polyamide fibers, 55% (wt%) of phenolic resin fibers, and 5% (wt%) of mica powder, with
polyethyleneimine interposed therebetween It is formed by using an aqueous epoxy resin and a
melamine resin as a binder and using an alkyl ketene dimer as a water resistance agent, followed
by heat forming. [Tear strength 1 (Elmendorf tear test) state strength Conventional diaphragm
(room temperature normal humidity) 17.5 gr Diaphragm of the present invention (room
temperature normal humidity) 27. Ogr-= (300 ° C, 30 minutes) 17.5gr〃 (350 ° C, 20 minutes)
10.5gr〃 (400 ° C, 10 minutes) 8.0gr Kraft pulp based diaphragm with 200 ° C When left in
the atmosphere for 5 minutes, it deforms, loses its function as a diaphragm, and is ignited within
1 minute in an atmosphere at 280 ° C. to 300 ° C. and disappears. [Flame Retardant 1 The
diaphragm of the present invention has a flame retardant effect such that the flame of the
diaphragm disappears immediately after removing the flame by applying the flame (19 m height)
of the gas burner to the diaphragm for 10 seconds . [Stiffness comparison 1 Young's modulus
inner sound loss rate (10 '' dyn / cj) (10-2) (105 cm / 5 ee) conventional diaphragm 1.2 4.2 1.55
Diaphragm 2.35 3.0 1.90 [size degree] IKBB size degree test] conventional diaphragm 20
seconds diaphragm of the present invention 75 seconds flame resistance of the present invention
has almost no ignition in vertical test, and self-extinguishing As described above, it is effective in
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working on aromatic polyamide fibers and phenolic resin fibers as described above.
The sound pressure-frequency characteristic of the speaker according to the present invention is
as shown in FIG. 2, and the band is very wide compared with the characteristic of the speaker
using the diaphragm made of the conventional kraft pulp (FIG. 6). It has become a thing.
Furthermore, FIG. 3 shows the sound pressure-frequency characteristics when left to stand in a
temperature atmosphere of 300 ° C. for 30 minutes, and FIG. 4 shows the sound pressurefrequency characteristics when left to stand at 350 ° C. for 20 minutes. , Both of these fully
demonstrate the function as a speaker. Furthermore, FIG. 5 shows the sound pressure-frequency
characteristics when left in an atmosphere of 400 ° C. for 10 minutes, but although the
characteristic deterioration is slight, it can be seen that the function as a speaker is sufficiently
satisfactory. Effects of the Invention As described above, the speaker according to the present
invention withstands high temperature sufficiently and is excellent in productivity, and has an
industrial value of exhibiting a function as a disaster prevention speaker even in an abnormal
situation at the time of fire occurrence. .
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a half sectional view showing one embodiment of the speaker according to the present
invention, FIG. 2 is a sound pressure-frequency characteristic diagram of the same speaker, and
FIG. 3 is a sound after leaving for 30 minutes at 300.degree. Fig. 4 is a pressure-frequency
characteristic diagram, Fig. 4 is a sound pressure-frequency characteristic diagram after standing
at 350 ° C for 20 minutes, Fig. 5 is a sound pressure-frequency characteristic diagram after
standing at 400 ° C for 10 minutes is there.
FIG. 6 is a sound pressure-frequency characteristic diagram of a conventional speaker. 1 · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · magnetic gap, 10 · · · ·
voice coil. Name of agent Attorney Attorney Shigetaka and one other person 弔 弔 3 周 周 皮 皮-9
L Hz
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