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JPS5897999

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DESCRIPTION JPS5897999
[0001]
The present invention relates to a diaphragm for a speaker, and it is an object of the present
invention to obtain a diaphragm for a speaker having excellent frequency characteristics by
using a composite film obtained by combining mica with a polybisphenol phthalate type resin
composed of aromatic dicarboxylic acid and dihydric phenol. It is Generally, a polyethylene
terephthalate film (for example, Mylar (trademark)) has been used as a diaphragm material for a
speaker diaphragm made of plastic. However, polyethylene terephthalate has a small elastic
modulus, and in the case of a full range speaker, the bandit resonance frequency (fH) is low, and
the reproduction in the high range is not necessarily good. The present invention solves the
above-mentioned drawbacks and provides an excellent loudspeaker diaphragm. That is, the
diaphragm of the present invention is formed of a composite film in which q-mica, such as
muscovite (white mica), phlogopite (phlogopite), etc., is compounded on a polybisphenol 2-tallow
resin composed of aromatic carboxylic acid and dihydric phenol. It is a thing. Here, the
polybisphenol phthalate type resin as a base material has the following basic structure. Or, on the
other hand, muscovite (white mica), phlogopite 1 m mother, etc. are used as mica as a reinforcing
material. The composite film having such a constitution has an elastic modulus of 210 to 8 oO o
O (Kg / cd), and a (La-) 19000 (Kr /? It is very large compared to r11). In addition, since the
diaphragm formed by molding the above composite film has a high elastic modulus, the high
region resonance frequency fH is high, and the reproduction up to the high region can be
performed. In addition, the loss of the above composite film is 0.021 to 0.035, which is 4 to 7
times larger than Mylar's o and oos, so the diaphragm made from this has a small so-called "spar"
on the frequency characteristics , Less distortion. In addition, the composite film has a heat
distortion temperature of about 160 ° C. and exhibits excellent heat resistance. And since it is
self-extinguishing in a flame resistance test, the diaphragm which shape ¦ molded this composite
film can withstand high temperature and has a flame retardance. Therefore, an optimal
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1
diaphragm can be obtained for a speaker requiring heat resistance and flame resistance. In
addition, the resin portion of the composite film is non-defective, and does not crystallize even
when left in a high temperature atmosphere for a long time, and is still non-defective. Therefore,
there is neither change in appearance nor change in various physical properties. Being nondefective also in terms of molding to a diaphragm, molding is easier and mass production is
possible compared to mylar with high crystallinity.
Next, an example will be described. Example 1 A polybisphenol phthalate type resin having the
structure shown below as a diaphragm for diaphragm formation is mixed in a ratio of 3 near or
mica is phlogopite (phlogopite) -based mica. % G3 (AllSt 301 °) · (OH) was used as the molecular
formula. Then, mica having a weight ratio of 30 q6 was compounded to the above resin. The
elastic modulus of this composite film was 4eooo (Kg / cr / l) loss was 0.031. The diaphragm was
formed by vacuum forming to obtain a cone-shaped diaphragm having a diameter of 40 mm and
a thickness of 80 μm. The acoustic characteristic of the speaker using this diaphragm is shown
by curve a in the figure. Curve b in the figure shows the acoustic characteristics of a speaker
using a diaphragm formed of Mylar film having the same diameter and thickness. As apparent
from the figure, the speaker using the diaphragm made of the composite film of the present
embodiment has a high elastic modulus, so that the high region resonance frequency fH becomes
high, and the reproduction in the high region becomes good. In addition, since the loss is large,
an excellent speaker having a small so-called "far" on the frequency characteristics was obtained.
Example 2 5.0% by weight of mica was compounded to the resin used in Example 1 above. The
elastic modulus of this composite film was 21000 (Kg / (4), and the loss was 0.021. A speaker in
which the film of this example is molded into a diaphragm in the same manner as in Example 1 is
superior in high-pitched sound and quality compared to a diaphragm molded of Mylar film, and
has a small frequency characteristic of "farring" Was excellent. Example 3 90% by weight of mica
was compounded to the resin used in Example 1 above. The elastic modulus of this composite
film was 5 oooo (Ky / c4), and the loss was 0.035. In the same manner as in Example 1, the
speaker in which the film of this example was formed into a diaphragm was superior in highpitched sound reproduction to a diaphragm made of mylar film and excellent in small frequency
characteristics of "Abare". there were. As described above, according to the present invention,
since the composite film in which mica is complexed to the polybisphenol phthalate type resin is
used, the high region resonance frequency fH is high, and reproduction in the high region is
possible. Thus, it is possible to obtain an excellent speaker diaphragm with less
[0002]
Brief description of the drawings
[0003]
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2
FIG. 41 is a comparison characteristic diagram of the frequency characteristic of the speaker
diaphragm and the frequency characteristic of the conventional Mylar film diaphragm showing
one embodiment of the present invention.
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