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JPH0723495

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DESCRIPTION JPH0723495
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker subcone which is attached to the upper surface of a central portion of a diaphragm of a
speaker used in various kinds of audio equipment and is mainly used to reproduce high-pitched
sound.
[0002]
2. Description of the Related Art A conventional speaker subcone of this type will be described
with reference to the drawings.
[0003]
FIG. 4 is a perspective view showing the configuration of a conventional speaker sub-cone, and
the materials include metals such as aluminum and titanium or polymeric materials such as
polyarylate (PA) and polyethylene terephthalate (PET), and further nylon, polyester, etc. Chemical
fibers are impregnated with a phenol resin for shape retention and then coated with rubber latex
such as SBR, NBR, etc., and pulp, etc., and these substrates are formed into a predetermined
shape using a molding die to obtain a speaker The sub cone 5 was constructed.
[0004]
However, in the above-described conventional configuration, when metal is used as the material
of the speaker sub-cone 5, the rigidity of the speaker sub-cone 5 is increased, and the high
frequency limit frequency can be improved. However, since the specific gravity is high, the sound
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pressure in the output sound pressure frequency characteristic of the speaker is low, and since
the internal loss is low, the distortion is also large, and the cost is the highest.
[0005]
In addition, when a polymer material is used, the high frequency limit frequency is low because
the rigidity of the speaker sub cone 5 is low, and a characteristic sound unique to the polymer
material is generated, and the adhesion is also poor. The problem was that the problem
remained.
[0006]
In addition, when a substrate coated with rubber latex is used after impregnating chemical fiber
with phenol resin, the rigidity of subcorner 5 for speaker is low, so the high frequency limit
frequency is low and the heat resistance is low. It can not be used for outdoor or automotive
applications where reliability is required.
Furthermore, since a large amount of phenol resin is impregnated to prevent deformation due to
humidity, there is a disadvantage that a hard inherent sound unique to the phenol resin is
generated at the time of sound quality reproduction.
[0007]
Furthermore, when pulp is used, the high frequency band lowers because the rigidity of the
speaker sub cone 5 is low, and the physical properties are unstable because the pulp itself has
hygroscopicity.
[0008]
An object of the present invention is to solve the above-mentioned conventional problems, and to
provide a speaker sub-cone capable of exhibiting excellent speaker performance.
[0009]
[Means for Solving the Problems] In order to solve the above problems, the speaker subcone
according to the present invention is provided with a metal layer by sputtering on one side or
both sides of a chemical fiber, and then impregnated with a phenol resin. Alternatively, the base
is formed by heating and molding a heat crosslinkable resin on both sides a plurality of times
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into a predetermined shape.
[0010]
According to this configuration, the chemical fiber used as the base material of the speaker subcone can reduce distortion because the internal loss is very high compared to that for metal
materials and polymer materials.
Moreover, by coating the surface of the chemical fiber with metal, the rigidity becomes high, and
the high frequency limit frequency can be improved.
Further, by coating the thermally crosslinkable resin, reliability such as heat resistance, weather
resistance, moisture resistance and the like is significantly improved, and it becomes possible to
use it indoors as well as for outdoor use and in-vehicle use.
Furthermore, since the impregnation amount of the phenol resin can be reduced by the
improvement of the heat resistance, it is possible to reproduce clear sound quality without
inherent sound.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A speaker subcone according to
an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing the construction of a speaker cone for a loudspeaker
according to the present invention, wherein a titanium layer 2 with a thickness of about 1000 Å
is provided by sputtering on one side of a polyester fiber (area weight of about 45 g / m 2) 1 For
about 5 g / m 2 of a solid content of about 20% phenolic resin and a viscosity of about 150 CPS,
and about 20% solid content of a chlorosulfonated polyethylene resin 3 It became 35 g / m2.
However, when the base material is a natural fiber (silk, cotton, etc.), the physical property is not
stable because the water absorption rate of the base material is high, so that variation occurs
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when forming the titanium layer 2.
[0012]
Physical properties of the coating agent (chlorosulfonated polyethylene resin 3) are shown in
(Table 1).
[0013]
In Table 1, the conventional product is data of SBR resin, and it can be understood from this
(Table 1) that the tensile strength is improved in the inventive product.
[0014]
The heat resistance of the above coating material is shown in FIG. 2 and the weather resistance is
shown in FIG. 3. According to FIGS. 2 and 3, both the heat resistance and the weather resistance
of the invention are significantly improved in comparison with the conventional SBR resin. You
can see that
[0015]
Further, the titanium titanium layer 2 surface-coated by the sputtering method has an
amorphous structure, and this amorphous is also called an amorphous material, and has the
following features as compared with the crystal structure type of a general metal.
(1) High mechanical strength and excellent toughness.
(2) It has high hardness.
(3) Excellent corrosion resistance.
[0016]
For this reason, the speaker sub cone 4 according to the present invention has a structure having
high rigidity due to the height of the internal loss of the polyester fiber 1 of the base material and
the titanium amorphous coating formed on the surface of the base material.
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[0017]
The above substrate was molded into the shape shown in FIG. 1 at a molding temperature of 190
° C. and a molding time of 15 seconds to constitute a speaker sub cone 4.
The high internal loss of the base material and the high heat resistance of the resin make it
possible to reduce the amount of impregnation of the phenolic resin for shape retention, so it is
possible to reduce the hard intrinsic sound unique to the phenolic resin. Further, by the high
rigidity of the coating layer on the surface, it is possible to improve the high frequency band limit
frequency and to realize clear sound quality.
[0018]
As described above, since the speaker sub-cone according to the present invention is configured,
clear sound quality without natural sound can be realized, and further, the high frequency limit
frequency can be improved by surface coating, In addition, since it is possible to reduce the rate
of change in physical properties due to special environments such as heat resistance and weather
resistance, it becomes possible to use not only for indoor use but also for outdoor use and
automotive use, industrially It is of great value.
[0019]
Brief description of the drawings
[0020]
1 is a cross-sectional view showing the configuration of a speaker sub cone according to an
embodiment of the present invention
[0021]
Fig. 2 Characteristic diagram showing the heat resistance of the coating material used for the
speaker subcone according to the same embodiment
[0022]
Fig. 3 Characteristic diagram showing the weather resistance of the coating material used for the
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speaker subcone according to the same embodiment
[0023]
FIG. 4 is a cross-sectional view showing the configuration of a conventional speaker subcone
[0024]
Explanation of sign
[0025]
1 polyester fiber 2 titanium layer 3 chlorosulfonated polyethylene resin 4 subcone
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