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JPH0720795

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DESCRIPTION JPH0720795
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm, and more particularly to a speaker diaphragm having excellent appearance,
toughness, and balance between rigidity and internal loss.
[0002]
2. Description of the Related Art As a diaphragm for this type of speaker, the rigidity is large so
that an unnecessary vibration mode does not occur in the diaphragm, and it has an appropriate
internal loss so as to absorb the unnecessary vibration. But
[0003]
Also, in recent years there is a tendency for a matte appearance with a calm atmosphere to be
favored, and in view of both performance and appearance, various paintings are applied to paper
diaphragms, synthetic resin diaphragms, metal plate diaphragms, etc. A painted diaphragm has
been proposed.
[0004]
By the way, conventionally, for example, a coating vibration made of a polyurethane resin as a
base material to which a synthetic resin paint or a paint in which mica fine powder, titanium
white or the like is mixed in the synthetic resin is applied A board has been proposed.
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1
Although this paint diaphragm can achieve a reasonable effect in terms of rigidity, it has a
problem that it is difficult to obtain a sufficient internal loss.
[0005]
Further, in the matte coating of a general synthetic resin paint, there is also a problem that it is
easily scratched and causes damage on the maker side or the user side.
[0006]
The present invention has been made in view of the above, and the purpose of the present
invention is to make the appearance moist and matte, the coating film to be tough and scratch
resistant, and to have the rigidity and the internal loss. An object of the present invention is to
provide a balanced speaker diaphragm.
[0007]
[Means for Solving the Problems] In order to achieve the above object, in the present invention, a
coating material in which a base resin and a natural collagen fiber fine powder are compounded
is applied to a base material 2 of a diaphragm, Form.
[0008]
In the present invention, the base material 2 of the diaphragm is coated with a paint containing
natural collagen fiber fine powder to form the coating film 3, so the appearance becomes moist
and matt, Reduce the reflection of light, act gently to the eyes.
[0009]
In addition, since a tough coating 3 is obtained by combining the soft natural collagen fiber fine
powder with the strong and tenacious base resin, it is hard to be scratched.
[0010]
Further, as described above, since the coating film 3 obtained by applying the coating
composition in which the soft natural collagen fiber fine powder and the strong and tenacious
base resin are combined is excellent in vibration absorption, Compared with the conventional
paint diaphragm, the internal loss is high, and a paint diaphragm with a well-balanced rigidity
and internal loss can be obtained, and the flat frequency property, especially the frequency
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2
property that suppresses the runaway of the middle and high frequencies It is possible to obtain
the characteristic and the sound quality with a sense of luxury
[0011]
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
FIG. 1 is a longitudinal sectional view showing an example of a speaker equipped with a
diaphragm according to the present invention, FIG. 2 is an enlarged view of part P of FIG. 1, and
FIG. 3 is a conventional paint diaphragm and a speaker according to the present invention It is
the figure which compared and showed the characteristic with the diaphragm for diaphragms.
[0013]
The speaker diaphragm 1 of the embodiment shown in these figures is constructed by coating a
substrate 2 with a paint to form a coating 3.
[0014]
The base 2 is made of, for example, paper, a synthetic resin sheet, a thin metal plate, a ceramic or
the like.
[0015]
As the paint, a composite of a base resin and a fine powder of natural collagen fiber (protein
powder) is used.
Further, if necessary, a curing agent, a curing accelerator and the like are blended in the base
resin and the natural collagen fiber fine powder.
A urethane resin, an acrylic resin or the like is used as the base resin.
In particular, as the urethane resin, a soft special urethane resin having a molecular weight lower
than that of a normal urethane resin and having a rubber-like property is used.
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And an isocyanate etc. are used as said hardening agent, for example.
[0016]
Further, in the case of using a material having poor adhesion of paint, such as polypropylene
sheet, as the substrate 2, an adhesion auxiliary agent (primer) is applied to the substrate 2 to
impart adhesion. Finally, the paint is applied to form a coating 3.
[0017]
Next, a more specific embodiment will be described.
[0018]
(1) A 100% wood pulp, paper diaphragm with a thickness of 150 μm was used as the substrate,
and (2) Matiro quick-drying type (trade name: Idemitsu Petrochemical Co., Ltd.) was used as the
paint.
The main component of this matillo quick-drying type is a mixed liquid obtained by blending
about 30% by weight of natural collagen fiber fine powder in a dry state with the special
urethane resin.
(3) The paint of the above (2) was applied to the surface of the base of the above (1) according to
the specifications of the following Table 1 to form a coating film having a thickness of 100 μm.
[Table 1] (4) From the above, it was possible to obtain a matte speaker diaphragm having a moist
appearance.
In addition, the combination of the soft natural collagen fiber fine powder and the strong and
special special urethane resin makes it possible to obtain a speaker diaphragm having a tough
and scratch-resistant coating.
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Furthermore, the rigidity and internal loss are well-balanced, and as shown in FIG. 3, the runaway
of the frequency characteristic of the middle range (1-2 kHz) is particularly suppressed, flatter
frequency characteristics are obtained, and the reproduction limit of the high region It also
extended.
That is, FIG. 3 shows sound pressure characteristics with respect to frequency, where the broken
line a represents the conventional one and the solid line b represents the present invention.
[0019]
(1) A polypropylene sheet having a thickness of 300 μm was used as a base material of the
diaphragm (2) Matiro ST (trade name: Idemitsu Petrochemical Co., Ltd.) was used as a paint.
The main component of this Matillo ST is a mixed liquid obtained by blending natural collagen
fiber fine powder with acrylic resin.
(3) The polypropylene sheet as the base material has poor adhesion of the paint as it is, so an
adhesion auxiliary agent was applied to the surface of the base material to form an adhesion
auxiliary layer.
Micron # 3000 (two-component acrylic) was used as the adhesion promoter. (4) Next, the paint
of the above (2) was applied on the adhesion auxiliary layer on the surface of the substrate
according to the specifications of Table 2 below, to form a coating of 50 μm in thickness. [Table
2] (5) According to the above, a paint is obtained by combining acrylic resin and natural collagen
fiber fine powder on the surface of a polypropylene sheet which is tough as a substrate but has
poor adhesion of the paint via an adhesion auxiliary layer. It is almost the same as the speaker
diaphragm obtained in Example 1 with respect to the other properties of the speaker diaphragm
obtained in this Example 2 to obtain a speaker diaphragm in which the coating film is adhered.
The
[0020]
Even if the present invention is applied to a dust cap, it is the same as the above-mentioned
speaker diaphragm.
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[0021]
[Effects of the Invention] As described above, in the present invention, since the paint containing
the natural collagen fiber fine powder is applied to the base material 2 of the diaphragm to form
the coating film 3, the appearance is improved. It has the effect of becoming moist and matting,
suppressing light reflection, and acting gently on the eyes, and by combining a soft natural
collagen fiber fine powder with a strongly sticky base resin, a tough coating 3 is obtained.
Therefore, the coating film 3 obtained by coating a composite of a soft natural collagen fiber fine
powder and a strongly sticky base resin is excellent in vibration absorption. Compared to the
conventional paint diaphragm, the paint film has a high internal loss, and a well-balanced paint
diaphragm with rigidity and internal loss can be obtained. There is an effect that can be obtained
and sex characteristics, the sound quality feeling of luxury.
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