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JPS5755697

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DESCRIPTION JPS5755697
[Description of the invention] Acoustic parts Acoustic parts characterized in that thermosetting
resin is used as a binder of polyoxymethylene whiskers.
Claims
DETAILED DESCRIPTION OF THE INVENTION In general, the first condition of physical
properties required for a speaker head 7, a diaphragm such as a microphone, a shell of a
cartridge, a shell of a cartridge, a cantilever of a tone arm cartridge, a cabinet of a speaker, etc. It
is high. When the Young's modulus is large, for example, in the diaphragm, the divided vibration
can be driven to a high frequency. Recently, in order to increase the Young's modulus, attempts
have been made to blend inorganic substances such as mica into a thermosetting resin such as
epoxy, to form a prepreg or molding composite, and then to heat cure to obtain an acoustic
component. However, this mica etc. is used as a binder and has poor wettability with
thermosetting resins such as epoxy resin, and the acoustic parts manufactured from this K are
extremely fragile, and there is a defect that the strength is small, and this mica etc. has good
properties Physical characteristics, and there was a disadvantage that was not attractive. On the
other hand, polyoxymethylene single crystal whiskers obtained by the method developed by the
Institute of Industrial Technology, Fiber and Polymer Materials Research Institute of the Ministry
of Trade and Industry have a Young's modulus of about 1 × 1 N / m and are as large as carbon
fibers. The single crystal whiskers are preferably wet with a binder of a thermosetting resin such
as epoxy. Further, since the polyoxymethylene whisker has a shape in which an infinite number
of needles project radially from one point, all physical properties of the composite with epoxy or
the like are not directional. . The present invention is intended to obtain an acoustic component
having favorable acoustic characteristics in which the acoustic component using such
polyoxymethylene whiskers can be made to be able to sufficiently exhibit the physical
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characteristics of the polyoxymethylene whiskers in%. It is a thing. In the following, with
reference to the drawings, an example of an acoustic component according to the present
invention will be described with reference to EndPage: 1 with an example of a speaker
diaphragm as well as an example of its method of loss. In this example, as a thermosetting resin
in a container (1), 75 g (7-fold b) of polyoxymethylene whisker (3) is further added, and heat is
not applied to the mixer (4). Knead. This mixed material * m is injected into the mixture and
preheated to form a prepreg sheet (5) as shown in the 21st WK. The prepreg sheet (5) or the
premix is cured at 70 ° C. for 20 minutes by a heating compression molding machine (6) to
form a diaphragm of a speaker. The tensile Young's modulus of the diaphragm of the
loudspeaker according to this example is 4.87 × 1 G (N, / m) when added using a visco-elastic
spectrometer, and such a thermosetting resin Compared to whiskers (Young's modulus 2.85 × 1
G without N 3 and N 70%), the improvement is almost double.
Further, in the same manner as described above, 50 g of the above-mentioned thermosetting
epoxy resin (manufactured by SHELL, manufactured by Shell, product name: Engineering butt
828), shell 39. Using this product 100140 g BF $ MBA 3.3 g, this mixture is injected into the
mold at equal pressure and preheated to form a prepreg sheet (5). Also, the mixed material is
cured for a predetermined time and then at 160 ° C. for 1 hour to form a speaker diaphragm.
The tensile Young's modulus of the diaphragm of the speaker according to this example was
measured using a visco-elastic spectrometer and found to be 3.77 × 10 (N 7 m), and such a
thermosetting resin (2) was a polyoxymethylene whisker ( 3) Young's modulus 3.22 × 1 GCN 7
m) K is improved in comparison with no addition. When the polyoxymethylene whiskers (the
amount of 3 (1.0 g (1, 1 wt%), 1.9 g (2, 1 wt%)) added to the above-mentioned thermosetting
resin (2) are the same as described above The Young's modulus of the diaphragm obtained by T.
et al. Was 3.66 × to (N / normal), 3 near 3 × 1♂ (N / 嘱 2). From this, it is understood that
increasing the amount of polyoxymethylene whiskers (3) to be added to the thermosetting resin
(2) improves the Young's modulus. Therefore, a reinforced diaphragm can be obtained by using a
thermosetting resin as a polyoxymethylene whisker binder. Furthermore, the polyoxymethylene
whiskers are colored by obtaining a strong vibration plate which is very wet with thermosetting
resins such as unsaturated polyesters and epoxy yarn resins, and the physical properties of
polyoxymethylene whiskers are favorable. The characteristics can be sufficiently exhibited.
Furthermore, since this polyoxymethylene whisker has a shape in which a large number of
needles project radially from one point, there is no directivity in the physical properties of the
composite, which is advantageous as an acoustic property. In the above example, whiskers of
polyoxymethylene and a thermosetting resin were kneaded, and this kneaded material was busy
making it into prepreg or molding and then heat forming. The whiskers and other fibrous
material bundles Ib-powder etc. are mixed, and a mat is manufactured from this mixture, and the
mat is coated with a thermosetting resin impregnated and sprayed to make a prepreg, which is
then heated. It can be easily understood that the same function and effect as described above can
be obtained even if the diaphragm of the speaker is obtained by heat-hardening molding with a
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compression molding machine. In the above embodiment, although the present invention is
applied to the diaphragm of the speaker, the present invention is applied to the head shell of the
cartridge, tone arm, car) other acoustic components such as a cantilever of U-edge, speaker
cabinet, etc. Of course it can be applied to
In this case, it is easy to understand that, according to the present invention, the acoustic
characteristics are superior, so that the characteristically good acoustic component can be
obtained and the EndPage: 2 can be obtained. Although unsaturated polyester and epoxy resin
are used as the thermosetting resin in the above embodiment, it goes without saying that other
thermosetting resins such as phenol resin can be used instead. Of course, the present invention is
not limited to the above-described embodiment, and various other configurations can be taken
without departing from the scope of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, FIG. 2 and FIG. 3 are diagrams showing an
example of a method of manufacturing an embodiment of an acoustic component according to
the present invention wAK. (2) is a thermosetting resin, (3) is a polyoxymethylate / whisker, and
(5) is a prepreg sheet. Same 1 feM '! −。 第 Figure 2 = 〒 = EndPage: 3
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