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1, -7 Specification 1, title of the invention
Speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a diaphragm for a
speaker, and an object of the present invention is to provide a speaker that can achieve weight
reduction while simultaneously satisfying physical properties of high specific elastic modulus and
high internal loss. It is in providing a diaphragm. In general, the physical properties required of
the material for the speaker diaphragm are light weight (low density) in terms of sound pressure,
high specific elastic modulus (elastic modulus / density) in terms of reproduction high frequency
limit, and frequency characteristics High internal loss is desired for flatness. There are no
materials that satisfy these conditions sufficiently, but at present, paper corn mainly composed of
wood pulp is used more frequently because it satisfies these conditions moderately. Materials
meeting one or two of these conditions are used with limited applications. The polymer film
diaphragm used for EndPage: 1 of boron, titanium, etc. and having a high internal loss, such as
polypropylene, is mainly used only for the woofer. Besides these, various materials and laminated
structures having an aluminum honeycomb, a foam as a core material, and the like are used, but
their use is limited in any case. Elastic modulus and internal loss are generally contradictory
physical properties, and no single material satisfies both of them. At present, it is known that a
composite obtained by kneading a scaly material with a polymer resin such as an epoxy resin or
a vinyl chloride resin satisfies both the above-mentioned physical properties, and is partially used
as a speaker diaphragm. However, the density is increased due to the mixed wire with the
polymer resin, and there is a problem in weight reduction. In addition, in paper cones in which
wood pulp and scaly materials are mixed, the processability is poor and continuous processes
can not be taken, and the bonding strength between wood pulp and scaly materials is so weak
that the specific modulus does not increase so much It had The present invention solves the
above-mentioned conventional drawbacks and is --- --- and is made from a thermoplastic
synthetic pulp as a base material and mixed with scaly material as a reinforcing material. This
has the feature of simultaneously meeting the properties of light weight, high specific elastic
modulus, and high internal loss simultaneously, has good formability which can not be found in
conventional paper cones, enables continuous forming, and thermoplasticity on the substrate.
The use of a resin has very excellent advantages in water resistance and moisture resistance. The
speaker diaphragm of the present invention is made of thermoplastic synthetic pulp as a base
material and mixed with a scaly material as a reinforcing material, and the mixed sheet is heated
and subjected to cold press molding at the time of softening, and thus, for a predetermined
speaker. It can be processed into the shape of a diaphragm. By mixing the synthetic valve and the
scaly material, a large amount of air layer is contained in the mixed sheet, and the porous layer is
formed even after the heating and forming process.
Therefore, the density of the final diaphragm sheet is small at 0 ° sy / ail to o and ey / lyl, and
weight reduction is possible, and there is also an advantage that continuous processes can be
taken. Also, the synthetic pulp is filmed to take the heating step. At this time, the synthetic pulp
base material and the scaly material are heat-sealed so that the reinforcing effect of the
reinforcing material appears largely, and it is possible to achieve a high specific elastic modulus.
Furthermore, since it is formed into a film, the air permeability is lost, the sound pressure is
improved, the water resistance, and the moisture resistance are also excellent. The thermoplastic
synthetic pulp referred to in the present invention is obtained by subjecting polyethylene,
polypropylene, polymethylpentene or the like to a hydrophilic treatment, and the scaly material
is mica. It refers to flaky graphite, glass flakes, shells, fish scales, etc. 150 μm or less is desirable
from the viewpoint of the dispersion and reinforcing properties of a thick scale 8 scale-like
material. If it is larger than 160 μm, the dispersibility is bad and partially weak spots occur. The
content of the scaly material is preferably 5 to 30 wt% in view of the elastic modulus and the
internal loss as shown in FIG. If the amount is more than sowt%, the formability becomes
extremely poor. By adding one or more types of wood pulp, aramid fibers, glass fibers and carbon
fibers as a reinforcing material in addition to the scaly material, the internal loss is slightly
decreased, but the specific elastic modulus can be improved. The incorporation of wood pulp is
effective in reducing the density and the incorporation of other fibers is effective in increasing
the modulus. The content of these fibers is limited to 20% by weight, and if it is mixed more than
this, the internal loss is greatly reduced. Fig. 2 shows the change of internal loss and elastic
modulus when carbon fiber is further mixed gradually in the system mixed with 20wt% of mica,
but the decrease of internal loss is large when the carbon fiber exceeds 20wt% I understand. The
same is true for fibers other than carbon fibers. The above four types of fibers are particularly
effective in terms of improvement in specific modulus. The speaker diaphragm of the present
invention will be described in the following examples. Example 1 A high density polyethylene
synthetic rope (rup (sowt%) is used as a base material, 20 wt% of mica as a reinforcing material is
added, and dispersed well with a disintegrator), and this is surface density 12oy / lrl by the same
paper making process To sheet. The mica used is ground with a ball mill for about one day, and
this is sieved with a 2oO mesh wire mesh, and the maximum size is approximately 150 μm.
Next, this paper-made sheet was heated for about 10 seconds with a far-infrared heater at
EndPage: 2 and immediately pressed cold when the sheet was softened to obtain a diaphragm.
Physical properties of this diaphragm are shown in Table 1. Example 2 70 wt% of high density
polyethylene synthetic pulp, 15 wt% of mica and 15 wt% of carbon fiber (fiber length 2 rub) as a
reinforcing material were added to a sheet made of paper and heated as in Example 1 after
heating. The speaker diaphragm was cold-formed. Physical properties of this diaphragm are
shown in Table 1. Example 3 Based on 60 wt% of high density polyethylene synthetic pulp as a
base material, as a reinforcing material, scaly graphite (sieved with 200 mesh) sowt% e wood
pulp 10 wt%, aramid fiber (fiber length 2 j El) 10 wt% f: A sheet is made, and a diaphragm for a
speaker is obtained by a cold press after heating as in Example 1. Physical properties of this
diaphragm are shown in Table 1. Example 4 High-density polyethylene synthetic pulp 80% by
weight ヲ base material, fish 5% by weight, glass fiber (fiber length 5 JII. A fiber diameter of 10
μm) 16 wt% is added as a reinforcing material to form a sheet. The koji used was obtained by
freezing the rice husk with liquid nitrogen, grinding it and sifting it through a 200 mesh net.
After heating, this sheet-formed sheet was cold-formed to obtain a speaker diaphragm. Physical
properties of this diaphragm are shown in Table 1. As a heating method, in addition to the far
infrared heater, heating may be performed for several seconds directly with a heating plate (180
° C.). If the content of reinforcement exceeds 40 wt%, the formability becomes extremely poor,
and it can be used only for diaphragms with a small drawing ratio, and even in this case, the
press speed is up to 3 to 4 sides / sec. You need to lower it. When the content of the reinforcing
material is 40 wt% or less, about 1 cm / second is sufficient. As is apparent from the results of
Table 1, conventional paper cones. Density, specific modulus compared to aluminum and film. It
can be seen that the internal loss is well-balanced and high. In addition, the frequency
characteristic of the speaker incorporating this diaphragm is high in reproduction high frequency
limit (fH) and has a sound pressure frequency characteristic in line. As described above,
according to the present invention, it is possible to obtain a speaker diaphragm that
simultaneously satisfies the properties of light weight, high specific elastic modulus, and high
internal loss, and has good formability because of using synthetic pulp as a base material. It
enables continuous molding and has excellent advantages in water resistance and moisture
4. Brief Description of the Drawings FIGS. 1 and 2 are characteristic curve diagrams of elastic
modulus and internal loss with respect to the content of reinforcing material of the speaker
diaphragm of the present invention. Name of agent Attorney Nakao Toshio et al. 1 person
EndPage: 3 ("" '%' Fat o No Lt 1-4 f End Page: 4
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