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JPH05183987

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DESCRIPTION JPH05183987
[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. 5 is a cross-sectional view showing the configuration of a conventional speaker diaphragm,
in which a cotton woven fabric coated with a urethane foam or a phenol resin and a polymer
resin is heat-formed into a corrugated shape using a molding die. The peripheral portion of the
diaphragm 10 is fixed to the inner edge portion to form the speaker diaphragm.
[0004]
FIG. 6 is a half sectional view showing the configuration of a conventional speaker diaphragm
formed in the same manner as FIG. 5, and shows an example using a heat-formed edge 11 in a
roll shape. The diaphragm was configured in this way.
[0005]
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1
However, when urethane foam is used for the edge 9 or 11 in the above-described conventional
configuration, it is advantageous in the sound quality of the speaker because the internal loss of
the material is high, but the edge shape Due to the long molding time for molding, the cost is
high, and the fields that can be used are limited because the physical property deterioration due
to ultraviolet light and humidity is severe.
When a cotton cloth is used for the edge 9 or 11, the cost is low and the physical property
deterioration due to ultraviolet light and humidity is reduced and it can be widely used, but a
large amplitude is added to the speaker because the elongation rate of the material is low. There
is a problem that not only does the deformation at the time of the vibration increase, and the
edge resonance occurs, but also the minimum resonance frequency fo of the speaker decreases
with long-term use.
[0006]
For this reason, in recent years, a large number of articles using a meta-based aromatic
polyamide fiber which is higher in strength than the cotton woven fabric and smaller in change
rate of the lowest resonance frequency fo are used as the base material.
However, the distortion is high because the internal loss of the base material is low and the
affinity to the phenol resin is not good, and there is a problem that the decrease in the rate of
change of the lowest resonance frequency fo of the speaker can not be suppressed significantly.
[0007]
An object of the present invention is to solve the above-mentioned conventional problems, and to
provide a diaphragm for a speaker having high reliability, in which reduction of edge resonance
and reduction of change rate of minimum resonance frequency fo of the speaker are prevented
beforehand. It is a thing.
[0008]
[Means for Solving the Problems] In order to solve the above-mentioned problems, the speaker
diaphragm according to the present invention comprises a cotton fiber woven on the surface of a
woven fabric of meta-aromatic polyamide fiber, and impregnated with this woven fabric A
thermosetting resin, a high internal loss polymer resin coated many times thereon, and an edge
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2
formed by thermoforming of the base material bonded to the outer peripheral portion of the
diaphragm main body is there.
[0009]
[Function] By using a woven fabric in which cotton fibers are woven on the surface of the woven
fabric of meta-aromatic polyamide fiber as described above, the strength of the base material is
enhanced and the decrease of the change rate of the lowest resonance frequency fo of the
speaker is suppressed. be able to.
In addition, by using a heat-crosslinking resin with high internal loss as a coating agent,
distortion of the speaker can be reduced, and reliability such as heat resistance and moisture
resistance can be improved.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker diaphragm
according to an embodiment of the present invention will be described with reference to the
drawings.
[0011]
FIG. 1 is a half sectional view showing the structure of a speaker diaphragm according to the
present invention, and FIG. 2 shows a substrate of an edge used for the diaphragm of the present
invention.
In FIG. 2, a base material in which a 40th-thick cotton fiber 4 is diagonally woven on a surface of
a plain weave woven fabric (80 g / m 2) 3 of a meta-polyamide fiber with a 40th thickness is
used. The resin is impregnated at 5% by weight ratio, and further, chlorosulfonated polyethylene
resin is coated on one side three times at 40% by weight ratio, then it is heat-formed into a
corrugated shape using a molding die and cut into a predetermined shape An edge 1 shown in
FIG. 1 is formed, and a diaphragm main body 2 is adhered to an inner peripheral portion of the
edge 1 to constitute a speaker diaphragm.
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3
[0012]
The output sound pressure-frequency characteristic of a speaker with an aperture of 16 cm using
the speaker diaphragm of the present invention is shown in FIG.
In FIG. 3, the dotted line shows the output sound pressure frequency characteristic of the
speaker using the speaker diaphragm according to the present invention, and the solid line
shows the output sound pressure frequency characteristic of the speaker using the conventional
speaker diaphragm. It can be seen that the edge resonance at 500 to 2000 Hz is reduced and the
flatter characteristic is obtained.
[0013]
Moreover, transition of the change rate of the lowest resonant frequency fo in the timedependent change of the said speaker is shown in FIG.
As apparent from FIG. 4, the fo change ratio of the speaker using the speaker diaphragm
according to the present invention is the fo of the speaker using the speaker diaphragm using the
edge 9 made of the conventional meta-based aromatic polyamide woven fabric. It can be seen
that it is smaller than the change rate.
[0014]
The same effect was obtained by using an acrylic heat crosslinkable resin instead of the
chlorosulfonated polyethylene used as the coating agent in the above examples.
[0015]
As described above, since the present invention is configured, it is possible to reduce edge
resonance and prevent a drop in the minimum resonance frequency fo change rate, and further
improve the reliability such as heat resistance and moisture resistance. It has great industrial
value.
[0016]
Brief description of the drawings
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4
[0017]
1 is a half sectional view showing the configuration of the speaker diaphragm in one
embodiment of the present invention
[0018]
2 is an explanatory view showing a woven fabric according to the same embodiment
[0019]
Fig. 3 Output sound pressure frequency characteristics of a loudspeaker using the loudspeaker
diaphragm according to the same embodiment and the conventional loudspeaker diaphragm
[0020]
Fig. 4 is a characteristic diagram showing the change of the lowest resonance frequency fo in the
time-dependent change of the loudspeaker using the loudspeaker diaphragm according to the
embodiment and the prior art.
[0021]
5 is a half sectional view showing the configuration of the conventional speaker diaphragm
[0022]
6 is a half sectional view showing the configuration of the conventional speaker diaphragm
[0023]
Explanation of sign
[0024]
Reference Signs List 1 edge 2 diaphragm main body 3 meta-based aromatic polyamide fiber
which is an edge base material 4 cotton fiber which is the same base material
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