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JPH08168093

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DESCRIPTION JPH08168093
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for various audio devices.
[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 half sectional view showing the configuration of a conventional diaphragm for a
speaker, 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 outer peripheral
portion of the diaphragm 8 is fixed to the inner peripheral portion to constitute a speaker
diaphragm.
[0004]
FIG. 5 is a half sectional view showing the structure of a conventional speaker diaphragm
configured in the same manner as FIG. 4 and the outer peripheral portion of the diaphragm 8 is
formed on the inner peripheral portion of the edge 9 heat-formed into a roll shape. The example
which adhered and comprised was shown and the conventional diaphragm for speakers was
comprised in this way.
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1
[0005]
However, when urethane foam is used for the edge 7 or the edge 9 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 is The cost is high due to the long molding time
for molding into a shape, and the field which can be used is limited because the physical property
deterioration due to ultraviolet light and humidity is severe.
[0006]
In addition, when cotton cloth is used for edge 7 or edge 9, cost is low, physical property
deterioration due to ultraviolet light and humidity is reduced, and it can be used widely, but
because the elongation rate of the material is low, the speaker has large amplitude There is a
problem that not only does the deformation when it is applied increase, and not only the
occurrence of edge resonance but also the minimum resonance frequency f0 of the speaker
decreases with long-term use.
[0007]
For this reason, many have recently used a meta-based polyamide woven fabric having higher
strength and a smaller f0 change rate than cotton woven fabric as a base material, but this
material has a low internal loss of the base material, In addition, the distortion is high due to poor
compatibility with the phenol resin, and there is a problem that the decrease in the f0 change
rate of the speaker can not be largely suppressed.
[0008]
An object of the present invention is to solve the above-mentioned conventional problems, to
prevent the reduction of edge resonance and the decrease of the f0 change rate of the speaker in
advance, and to provide a speaker diaphragm having high reliability.
[0009]
[Means for Solving the Problems] In order to solve the above problems, the diaphragm for a
speaker according to the present invention comprises a substrate obtained by coating a phenolic
resin and a polymer resin on a woven fabric prepared by blending phenolic fibers in para-based
polyamide fibers. An outer peripheral portion of the diaphragm main body is joined to an inner
peripheral portion of an edge obtained by heat forming processing into a predetermined shape.
[0010]
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2
[Function] With this constitution, the adhesion between the woven fabric blended with phenol
fiber and the coated phenolic resin for shape retention is good, and the adhesion is enhanced and
the internal loss of the woven fabric is increased for more integration. Distortion is reduced, and
as a result, a decrease in the f0 change rate of the speaker can be suppressed.
[0011]
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.
[0012]
FIG. 1 is a half sectional view showing the structure of a speaker diaphragm according to the
embodiment. This speaker diaphragm is a woven fabric in which 30% by weight ratio of phenol
fiber to para-based polyamide fiber is mixed with phenol resin. After coating 5% by ratio and
further coating 20% by weight ratio of chlorosulfonated polyethylene resin, it is thermoformed
into a corrugated shape using a molding die, and an edge 1 formed by cutting into a
predetermined shape, and this edge 1 The diaphragm body 2 has an outer peripheral portion
bonded to the inner peripheral portion of the diaphragm.
[0013]
When the blend ratio of phenol fiber is 10% or less, since the ratio of phenol fiber is small,
variation in quality of blend base material occurs and adhesion with phenol resin is weak and the
effect is small. When the blend ratio of phenol fiber is 30% or more, the tensile strength of the
blend base material is reduced, and the minimum resonance frequency f0 at large amplitude is
largely reduced, so that the above blend ratio is used in the range of 10 to 30%. This is very
important.
[0014]
In addition, FIG. 2 shows the sound pressure frequency characteristics of a speaker having a
diameter of 16 cm, which was created using the speaker diaphragm of the present invention.
In FIG. 2, the dotted line shows the output sound pressure frequency characteristic 3 of the
speaker using the speaker diaphragm according to the present invention, and the solid line
shows the output sound pressure frequency characteristic 4 of the speaker using the
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3
conventional speaker diaphragm. In particular, it can be seen that the edge resonance of 500 to
2000 Hz is reduced, resulting in a flatter characteristic.
[0015]
Moreover, transition of the change rate of the lowest resonant frequency f0 in the timedependent change of the said speaker is shown in FIG.
As apparent from FIG. 3, the f0 change rate 5 of the speaker using the speaker diaphragm
according to the present invention is the same as that of the speaker using the speaker
diaphragm using the edge 7 made of the conventional meta-based aromatic polyamide woven
fabric. It can be seen that it is smaller than f0 change rate 6.
[0016]
In addition, it is added that similar effects can be obtained by using a rubber-based coating agent
such as styrene butadiene rubber or nitrile butadiene rubber instead of the chlorosulfonated
polyethylene used in the above examples as the coating agent.
[0017]
As described above, since the speaker diaphragm according to the present invention is
configured, it is possible not only to reduce the edge resonance generated at the edge portion of
the speaker diaphragm but also to reduce the change rate of the minimum resonance frequency
f0. It has a great effect of being able to be prevented, and it has a great industrial value.
[0018]
Brief description of the drawings
[0019]
1 is a half sectional view showing the configuration of the speaker diaphragm in one
embodiment of the present invention
[0020]
Fig. 2 Output sound pressure frequency characteristic chart comparing the speaker using the
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speaker diaphragm according to the same embodiment with the conventional speaker
[0021]
Fig. 3 is a characteristic diagram showing the change of the lowest resonance frequency f0 in the
time-dependent change comparing the speaker using the speaker diaphragm according to the
same embodiment and the conventional speaker
[0022]
Fig. 4 A half sectional view showing the configuration of a conventional speaker diaphragm
[0023]
5 is a half sectional view showing the configuration of the conventional speaker diaphragm
[0024]
Explanation of sign
[0025]
1 edge 2 diaphragm main body 3 output sound pressure frequency characteristic of speaker
using speaker diaphragm according to the present invention 4 output sound pressure frequency
characteristic of speaker using conventional speaker diaphragm 5 speaker diaphragm according
to the present invention F0 change rate of the speaker used 6 f0 change rate of the speaker
using the conventional speaker diaphragm
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