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JPH1127791

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DESCRIPTION JPH1127791
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm for use in various acoustic devices.
[0002]
2. Description of the Related Art A conventional speaker diaphragm will be described with
reference to FIGS.
[0003]
FIG. 6 is a cross-sectional view of a speaker diaphragm, and FIG. 7 is a side cross-sectional view
of a dome-shaped speaker using the speaker diaphragm.
[0004]
First, referring to FIG. 7, the overall structure of the speaker will be described. 7 is a top plate,
and a magnet 8 and a yoke 9 form a magnetic circuit.
[0005]
A frame 6 is mounted on the yoke 9 and is mounted with an equalizer 11 and a dome-shaped
speaker diaphragm 4.
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[0006]
A voice coil 5 is coupled to the dome-shaped speaker diaphragm 4 and is inserted into the
magnetic gap 9a of the magnetic circuit. An adsorber 10 is disposed on the magnetic circuit.
[0007]
The dome-like speaker diaphragm 4 of the speaker configured as described above impregnates a
fiber material such as polyester with a thermosetting resin as a shape-imparting agent to produce
the substrate 1, and then a thermoplastic resin or a rubber material The coating layer 2 is formed
to complete the speaker diaphragm 4.
[0008]
However, in the conventional dome-shaped speaker diaphragm 4, the internal loss of the fiber
material itself is small, and resonance easily occurs on the vibration surface and the edge portion,
and the frequency characteristic is disturbed. When the internal loss of the coating agent is low
and the coating agent tends to occur, it is applied in large quantities to suppress resonance,
thereby increasing the weight of the vibration system and reducing the sound pressure as a
speaker. A big one has been desired.
[0009]
In addition, it has been desired to reduce second harmonic distortion by using a more flexible
resin in order to improve the damping property of the speaker diaphragm and to make linear
vibration.
[0010]
Furthermore, in order to eliminate air permeability and reduce third harmonic distortion due to
pinhole air leakage, a coating agent having a better film forming property has been desired.
[0011]
Moreover, also in durability, a more reliable one is desired.
[0012]
[Means for Solving the Problems] In order to solve the above problems, the speaker diaphragm of
the present invention comprises a fiber material impregnated with a thermosetting resin as a
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shape-imparting agent, and has an average molecular weight of at least 1,000,000 or more. A
speaker coated with a molecular weight acrylic resin and incorporating the diaphragm for a
speaker according to the present invention is less likely to cause disturbance in frequency
characteristics, and reproduces excellent sound quality with a small clear of second and third
harmonic distortions. be able to.
Moreover, the weight reduction of the speaker diaphragm can be achieved, and the output sound
pressure can be increased.
[0013]
In addition, since the diaphragm for this speaker has a very large molecular weight in durability
and has a cross-linked structure of acrylamide, it is excellent in heat resistance and does not
thermally deteriorate even if it is exposed to heat for a long time It is a thing.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present
invention, a fiber material is impregnated with a thermosetting resin as a shape-imparting agent
and coated with an ultrahigh molecular weight acrylic resin having an average molecular weight
of at least 1,000,000. Thus, it is possible to reproduce the excellent sound quality with a small
clear of the second and third harmonic distortions.
In addition, it is possible to reduce the weight of the speaker diaphragm and to provide a speaker
capable of increasing the output sound pressure, and also has a very large molecular weight in
terms of durability, and a crosslinked structure of acrylamide. As a result, it is possible to provide
a speaker diaphragm which is excellent in heat resistance and does not thermally deteriorate
even when exposed to heat for a long time.
[0015]
Hereinafter, a speaker diaphragm according to an embodiment of the present invention will be
described with reference to FIGS.
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In the description, the same parts as in the prior art will be assigned the same reference
numerals and explanations thereof will be omitted.
[0016]
FIG. 1 is a cross-sectional view of a speaker diaphragm according to an embodiment of the
present invention. The difference from the prior art is that the substrate 1 is manufactured and
then the coating layer 3 of ultrahigh molecular weight acrylic resin is formed to complete the
speaker diaphragm. That's the point I did.
[0017]
First, the process for producing the speaker diaphragm according to the above embodiment will
be described. A polyester fiber is impregnated with a 5% solution of phenol resin, and an
ultrahigh molecular weight acrylic resin with an average molecular weight of 1.5 million is
coated twice on the surface. Then, a dome-shaped speaker diaphragm was produced.
At this time, it was 92 g / m <2> when the mass per unit area of the coating cloth before shaping
| molding was measured.
Moreover, it was 0.05 cc / cm <2> second when the air permeability of this cloth was measured.
[0018]
Next, a conventional speaker diaphragm as a comparative example was manufactured as follows.
Only the coating resin was changed to SBR rubber latex, and the one coated three times was
molded to produce a dome-shaped diaphragm for a speaker.
Similarly, the mass per unit area before molding was 103 g / m 2 and the mass was 12%.
The air permeability was 0.3 cc / cm 2 seconds, and it was estimated that the number of pinholes
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was higher than that of the above embodiment.
[0019]
2 and 3 show the sound pressure-frequency characteristics, FIG. 2 shows the speaker according
to the present embodiment, and FIG. 3 shows the comparative example, and the speaker is
assembled and measured. The peak dip at 1k to 20kHz decreased and the sound pressure
increased by 1.6 dB.
[0020]
4 and 5 show distortion characteristics, FIG. 4 shows this embodiment, FIG. 5 shows a
comparative example, and this embodiment shows the second and third harmonic total
distortions. It was confirmed that 0.53% distortion was low at 5 k to 20 kHz.
[0021]
In addition, when each of the above speakers was left in an atmosphere at 110 ° C. for 240
hours and then the lowest resonance frequency of the speaker was measured, the resonance
frequency (F 0) of the one in the present embodiment increased by only 8%. On the other hand,
in the case of the comparative example, the temperature rose by 55%, the flexibility was lost and
the heat was deteriorated.
[0022]
In the above embodiment, an ultra-high molecular weight acrylic resin of 1.5 million or more was
used, but it was dispersed in the manufacturing process, and it was confirmed that the effect of
the present invention can be obtained if it is 1 million or more.
[0023]
As described above, the speaker diaphragm of the present invention comprises a fiber material
impregnated with a thermosetting resin as a shape-imparting agent and coated with an ultrahigh
molecular weight acrylic resin having an average molecular weight of at least 1,000,000 or more.
Thus, it is possible to reproduce the excellent sound quality with a small clear of the second and
third harmonic distortions.
In addition, it is possible to reduce the weight of the speaker diaphragm, and to provide a
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speaker that can increase the output sound pressure.
[0024]
In addition, also in terms of durability, since the molecular weight is very large and has a
crosslinked structure of acrylamide, it is excellent in heat resistance and does not thermally
deteriorate even when exposed to heat for a long period of time. It can be provided.
[0025]
Brief description of the drawings
[0026]
1 is a cross-sectional view of an embodiment of the speaker diaphragm of the present invention
[0027]
Fig. 2 Frequency characteristics of the speaker attached with the same speaker diaphragm
[0028]
Fig. 3 Frequency characteristics of the speaker attached with the speaker diaphragm of the
comparative example
[0029]
Figure 4 Distortion characteristics of the speaker attached with the speaker diaphragm of the
embodiment in Figure 1
[0030]
Fig. 5 Distortion characteristics of the speaker attached with the speaker diaphragm of the
comparative example
[0031]
Fig. 6 Cross-sectional view of the conventional speaker diaphragm
[0032]
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Fig. 7 A side sectional view of a dome-shaped speaker incorporating the same speaker diaphragm
[0033]
Explanation of sign
[0034]
1 substrate 3 coating layer
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