JPH0738990

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DESCRIPTION JPH0738990
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used in various audio equipment.
[0002]
2. Description of the Related Art A conventional speaker diaphragm of this type will be described
with reference to the drawings.
[0003]
FIG. 4 is a cross-sectional view showing the configuration of a conventional speaker diaphragm,
and the material thereof is a metal such as aluminum or titanium, or a polymeric material such as
polyarylate (PA) or polyethylene terephthalate (PET), and further nylon or polyester There are
those in which chemical fibers such as those are impregnated with a phenolic resin for shape
retention and then coated with a rubber-based latex such as SBR or NBR, etc., and these
substrates have a semicircular cross section using a molding die. The speaker diaphragm 2 was
configured.
[0004]
However, in the above-described conventional configuration, when metal is used as the material
of the speaker diaphragm 2, the rigidity of the diaphragm is increased, and reproduction of
higher frequency range is also possible. There is a problem that the specific gravity is high, the
sound pressure in the output sound pressure frequency characteristic of the speaker is low, and
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the distortion is also large because the internal loss is low, and the cost is the highest.
[0005]
In addition, when a polymer material is used, the rigidity of the diaphragm is low, so that the
high frequency range can not be reproduced, and the adhesion is also poor, so that the quality is
also poor.
[0006]
In addition, when a substrate coated with rubber latex is used after impregnating chemical fiber
with phenol resin, high rigidity can not be reproduced due to low rigidity, and high reliability can
not be obtained because heat resistance is low. Since it can not be used for the required outdoor
and automotive applications, and it is impregnated with a large amount of phenol resin to
prevent deformation due to humidity, there is a problem that a hard natural sound of phenol
resin is generated during sound reproduction.
[0007]
An object of the present invention is to provide a speaker diaphragm which can solve the abovementioned conventional problems and can exhibit excellent speaker performance.
[0008]
SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is to
impregnate one side or both sides of a natural silk fiber cloth with a phenol resin and to use one
side or both sides as a thermally crosslinkable resin chlorosulfonated polyethylene emulsion. Is
coated a number of times, and the base plate is heat-formed into a predetermined shape to form
a speaker diaphragm.
[0009]
[Function] By using natural silk fiber as the base material of speaker diaphragm, the internal loss
of silk fiber is very high compared to metal material, polymer material, chemical fiber material
etc. It is possible to reduce distortion It becomes.
Also, by coating the surface of the silk fiber with a heat-crosslinking resin, the reliability of heat
resistance, weather resistance, moisture resistance, etc. is greatly improved, and it can be used
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indoors as well as for outdoor and automotive applications. It becomes.
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.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker diaphragm
according to an embodiment of the present invention will be described below with reference to
the drawings.
FIG. 1 is a cross-sectional view showing the structure of a speaker diaphragm according to the
present invention, in which a phenolic resin having a solid content of about 20% for shape
retention is used on one side of natural silk fiber 13 (weight per unit area of about 48 g / m 2) It
was impregnated at about 5 g / m 2 by dry weight, and three times coated with a
chlorosulfonated polyethylene resin having a viscosity of about 150 CPS and a solid content of
about 20% to give a coating weight of about 35 g / m 2.
[0011]
Physical properties of the above-mentioned coating material are shown in (Table 1).
[0012]
The conventional product shows data of the SBR resin, and it can be seen that the tensile
strength and hardness of the product of the present invention are improved.
[0013]
The heat resistance of the coating material is shown in FIG. 2 and the weather resistance is
shown in FIG. 3. It is apparent from FIGS. 2 and 3 that both the heat resistance and the weather
resistance are significantly improved as compared with the conventional SBR resin.
[0014]
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The above base material was molded into a semicircular shape in cross section shown in FIG. 1 at
a molding temperature of 190 ° C. and a molding time of 15 seconds to constitute the speaker
diaphragm 1.
With such a configuration, since the internal loss of the base material and the heat resistance of
the resin are high, it is possible to reduce the amount of impregnation of the phenol resin for
holding molding, thereby reducing the solid natural sound of the phenol resin. It is possible to
achieve clear sound quality.
[0015]
As described above, since the speaker diaphragm according to the present invention is
configured, it is possible to realize clear sound quality without inherent sound, and it is possible
to realize physical properties by special environment such as heat resistance and weather
resistance. It becomes possible to reduce the rate of change, and it becomes possible to use it not
only for indoor use but also for outdoor use, car use and the like, resulting in great industrial
value.
[0016]
Brief description of the drawings
[0017]
1 is a cross-sectional view showing the configuration of a speaker diaphragm according to an
embodiment of the present invention
[0018]
Fig. 2 Characteristic diagram showing the heat resistance of the coating agent used for the
speaker diaphragm according to the same embodiment
[0019]
Fig. 3 is a characteristic diagram showing the weather resistance of the coating agent used for
the speaker diaphragm according to the same embodiment.
[0020]
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Fig. 4 is a cross-sectional view showing the configuration of a conventional speaker diaphragm
[0021]
Explanation of sign
[0022]
1 diaphragm
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