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JPH0560085

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DESCRIPTION JPH0560085
[0001]
BACKGROUND OF THE INVENTION This invention relates to the edge of a loudspeaker.
[0002]
2. Description of the Related Art FIG. 3 is a cross-sectional view showing a conventional speaker
edge disclosed in, for example, Japanese Patent Publication No. 56-8556. In the figure, 1 is an
edge substrate made of cotton cloth, synthetic fiber, etc. 2 is an impregnating agent of a
polyurethane resin impregnated on one surface of the edge substrate 1, and 3 is an impregnating
agent of a phenol resin on the other surface of the edge substrate 1.
[0003]
The edge substrate 1 is made of a cotton cloth or synthetic fiber cloth, and the polyurethane
impregnating agent 2 contains 1 to 20% by weight of an inorganic filler, and has the effect of
improving stiffness, controlling air permeability, and moisture resistance.
In addition, the phenol resin 3 has an effect of maintaining the shape after molding and
controlling the stiffness.
[0004]
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1
Since the conventional speaker edge is configured as described above, thermal degradation of the
edge substrate 1 and the impregnating agents 2 and 3 occurs at a high temperature of 200 ° C.,
and the stiffness is thus improved. As a result, there was a problem that the ascent and
destruction occurred and the speaker edge did not function. Also, at low temperatures, the
stiffness of the resin increases, and the speaker operation can not be performed stably.
[0005]
The present invention was made to solve the above-mentioned problems, and it is an object of
the present invention to obtain a speaker edge which can perform stable operation even in an
atmosphere of -20 ° C to 200 ° C. I assume.
[0006]
SUMMARY OF THE INVENTION A speaker edge according to the present invention has a
structure in which a glass cloth base material is impregnated with silicone rubber, molded and
vulcanized.
[0007]
[Features] The speaker edge according to the present invention is heat resistant to both the glass
cloth base material and the impregnating agent of silicone rubber, and is stable without any
increase in stiffness even in the atmosphere of -20 ° C to 200 ° C. Speaker operation can be
performed.
In addition, it is more resistant to mechanical degradation than a silicon rubber single edge, and
can also have a large internal loss.
[0008]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a cross-sectional view of a speaker edge, in which 1a is a glass cloth substrate, 2a is
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2
an impregnating agent of silicon rubber impregnated from the surface of the glass cloth
substrate 1a, and 3a is silicon impregnated from the back surface of the glass cloth substrate 1a.
It is an impregnating agent for rubber.
[0009]
The silicone rubber impregnating agents 2a and 3a impregnated in the glass cloth substrate 1a
not only give stiffness but also give a proper internal loss to control the speaker characteristics.
In addition, the glass cloth base 1a has an effect of compensating for the mechanical weakness of
the silicone rubber. The affinity between the glass cloth and the silicone rubber is excellent, so
peeling does not occur during operation. Moreover, both materials are excellent in heat
resistance, and there is little rise in stiffness and mechanical deterioration even in a 200 ° C.
atmosphere. In addition, the stiffness change is small even in the low temperature range, and
stable operation can be performed over a wide range of -20 ° C to 200 ° C.
[0010]
In the above embodiment, the ones impregnated with the impregnating agents 2a and 3a of
silicone rubber are described from the front and back of the glass cloth substrate 1a, but as
shown in FIG. The same effect can be obtained by impregnating with a rubber impregnating
agent.
[0011]
As described above, according to the present invention, since the glass cloth base material is
impregnated with a silicone rubber impregnating agent, and molded and vulcanized, it has a high
heat resistance and a thermally stable structure. There is an effect of obtaining an edge capable
of stable operation over a wide temperature range.
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