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JPH05161195

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DESCRIPTION JPH05161195
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibration system supporting member such as an edge and a damper in an electroacoustic
transducer.
[0002]
2. Description of the Related Art The vibration system support member of an electroacoustic
transducer, as is well known, has sufficient elasticity at the edge for the linearity of the amplitude
of the diaphragm and prevents the resonance of the edge itself and the resonance of the edge
and the diaphragm. In order to do so, a relatively large internal loss is required. Also for the
damper, as with the edge, sufficient stretchability and large internal loss are required.
[0003]
Therefore, the vibration-based support member of the conventional electroacoustic transducer is
made by impregnating a cotton fiber woven fabric or an aromatic polyamide fiber woven fabric
with a thermosetting resin such as phenol, and heat-pressing it, and further Those coated with
NBR, acrylic resin and urethane resin, those obtained by injection molding of vulcanized rubber,
and those obtained by heating and pressing a thermoplastic elastomer film or urethane foam.
[0004]
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[Prior Art to be Solved by the Invention] In the vibration type supporting member of the
conventional electroacoustic transducer having such a structure, the internal loss is obtained by
impregnating a cotton fiber woven fabric or an aromatic polyamide fiber woven fabric with
phenol or the like. Is small, so that the resonance unique to the vibration system support member
is generated.
In addition, even if the above-mentioned resin with a large internal loss is applied to these, the
internal loss of the vibration-based supporting member itself does not increase so much because
the internal loss of the cotton fiber and the aromatic polyamide fiber is small. As the weight
increases, the conversion efficiency of the vibrating portion is lowered, and the sound pressure
level of the electroacoustic transducer is lowered.
[0005]
And in the thing using a vulcanized rubber or a thermoplastic elastomer film, although internal
loss is large enough, since there is no expansion-contraction by the eye gap of fiber bundles like
textiles, elasticity is not enough, and a vibration part The linearity of the amplitude of the In
terms of heat resistance, there is no problem when it is used indoors, but when it is used for
vehicles etc., it may be used under high temperature of 100 ° C or higher, and under high
temperature around 130 ° C. Since the vibration system support member is softened and its
rigidity is reduced, deformation occurs and the acoustic characteristics are changed.
[0006]
Further, in the case of using urethane foam, urethane foam is excellent in stretchability but
inferior in weather resistance, and is deteriorated by temperature, humidity and ultraviolet rays,
thereby changing acoustic characteristics.
[0007]
As described above, the vibration system support member of the conventional electroacoustic
transducer has problems to be solved.
[0008]
An object of the present invention is to provide a vibration system supporting member of an
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electroacoustic transducer which has excellent stretchability and sufficient internal loss and is
excellent in weather resistance.
[0009]
According to a first aspect of the present invention, there is provided a vibration system
supporting member of an electroacoustic transducer according to the present invention, which
comprises a woven fabric using thermoplastic elastomer long fibers. According to a second
aspect of the present invention, there is provided a vibration system supporting member of the
electroacoustic transducer according to the first aspect, which is a woven fabric in which
thermoplastic elastomer long fibers and cotton fibers or aromatic polyamide resin fibers are
mixed and woven. In the third aspect of the present invention, the vibration system support
member of the electroacoustic transducer according to the first aspect comprises a thermoplastic
elastomer long fiber woven fabric, a cotton fiber or an aromatic polyamide based resin fiber
woven fabric And two or more layers are laminated, and in claim 4, the vibration system
supporting member of the electroacoustic transducer according to claim 1 is heat of two or more
kinds different in glass transition temperature (Tg). Plasticity Elastomer Long Fiber The
thermoplastic elastomer used in the vibration system supporting member of the electroacoustic
transducer according to claim 1, 2, 3 or 4 is polyurethane system. According to a sixth aspect of
the present invention, the vibration system supporting member of the electroacoustic transducer
of the first, second, third, fourth or fifth aspect comprises an acrylic resin layer formed on a
woven fabric using thermoplastic elastomer long fibers. The woven fabric is characterized in that
the woven fabric is impregnated with an acrylic resin.
[0010]
In the vibration system supporting member of the electroacoustic transducer having such a
configuration, the vibration is caused by the large internal loss of the thermoplastic elastomer by
being constituted by the woven fabric using the thermoplastic elastomer long fibers. The internal
loss of the system supporting member also increases, and since it is made of a woven fabric of
long fibers, sufficient stretchability can be obtained by the misalignment of the fiber bundles.
Moreover, it is sufficient also in weather resistance, such as moisture resistance and heat
resistance.
[0011]
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Here, in this vibration-system supporting member, in the case where the thermoplastic elastomer
long fiber is made of a woven fabric alone, excellent stretchability is obtained, and the internal
loss is a large internal loss of the thermoplastic elastomer itself. Become.
In addition, since the thermoplastic elastomer long fibers soften at a high temperature of around
130 ° C., the rigidity as the vibration system supporting member can not be maintained at this
temperature, and deformation occurs, but it is used for indoor use below this temperature
Sufficient rigidity is maintained in the case temperature range.
[0012]
In addition, a mixture of thermoplastic elastomer long fibers and cotton fibers or aromatic
polyamide based resin fibers, the thermoplastic elastomer long fibers being a woven fabric, a
cotton fiber woven fabric or an aromatic polyamide based resin fiber woven fabric, In the
laminated one, the stretchability is almost unchanged compared to the above-mentioned one
using the thermoplastic elastomer long fiber alone, and the internal loss is a little smaller, but it is
necessary when used for car use Even at high temperatures around 130 ° C, the heat distortion
temperature of cotton fibers and aromatic polyamide resin fibers is high, so the cotton fibers or
aromatic polyamide resin fibers maintain the rigidity of the whole vibration system support
member and prevent deformation Heat resistance is excellent.
[0013]
As described above, in the case of the woven fabric using the thermoplastic elastomer long fibers,
as described in the above-mentioned operation, it has excellent properties as a vibration system
supporting member.
[0014]
Next, it is composed of a woven fabric in which two or more types of thermoplastic elastomer
long fibers having different glass transition temperatures (Tg), which have an internal loss
characteristic suitable as a vibration system supporting member, are further mixed. The
operation of the vibration system support member will be described.
[0015]
Thermoplastic elastomers naturally have the property of producing a peak at the glass transition
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temperature (Tg) in the characteristics of loss tangent (Tan δ), which is a value indicating the
magnitude of internal loss.
Therefore, by selecting a thermoplastic elastomer having a glass transition temperature (Tg) near
room temperature and using the long fibers of this thermoplastic elastomer, a woven fabric using
only one type of thermoplastic elastomer long fibers described above Even with the vibration
system support member configured by the above, the internal loss sufficiently suitable as the
vibration system support member can be obtained in the temperature range around room
temperature.
However, when it is used at a temperature relatively lower or higher than room temperature, the
loss tangent (Tan δ) value is lower than the value at the glass transition temperature (Tg), so
that the interior is sufficiently suitable as a vibration system support member There is no loss.
As described above, it is difficult to obtain sufficient internal loss in a wide temperature range
with the one constituted by one kind of thermoplastic elastomer long fiber.
[0016]
Therefore, by mixing two or more types of thermoplastic elastomer long fibers having different
glass transition temperatures (Tg), two or more types of thermoplastic elastomers are mixed at
the raw material stage to form one type of long fibers respectively. In the temperature between
the glass transition temperature (Tg) of the raw material of the raw material, one loss tangent
(Tan δ) peak does not occur, but the interaction by the property of the loss tangent (Tan δ) of
each thermoplastic elastomer long fiber makes each The peak of the loss tangent (Tan δ) at the
glass transition temperature (Tg) possessed is suppressed, and the temperature is uniformly
spread over a wide temperature range with the lowest one and the highest one of the glass
transition temperatures (Tg) at both ends. Large internal losses can be obtained.
[0017]
In addition, by using a long fiber of polyurethane type having the largest internal loss among
thermoplastic elastomers, or by applying or impregnating an acrylic resin whose internal loss is
larger than that of the thermoplastic elastomer to the woven fabric used in the present invention
Thus, a vibration system support member having a larger internal loss can be obtained.
[0018]
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EXAMPLES In Example 1, polyurethane elastomer long fibers (1000 filaments) having a fiber
diameter of 7 to 10 μm were plain-woven at a fiber density of 24 / cm and had a basis weight of
80 g / m 2. A woven fabric was made.
Further, a solution obtained by diluting butyl acrylate with ethyl alcohol is coated on the woven
fabric with a knife coater to a constant thickness and dried with warm air to obtain a support
member sheet having a basis weight of 125 g / m 2 and a density of 0.19 g / cm 3. Made.
Next, this sheet was pressure-molded at 130 ° C. for 20 seconds to produce a vibration system
support member of Example 1 having a density of 0.25 g / cm 3.
[0019]
In Example 2, a polyurethane elastomer long fiber (1000 filaments) having a fiber diameter of 7
to 10 μm and a cotton fiber (30th count) are plain-woven at a fiber density of 24 / cm so that
both warp and weft alternate. A m2 woven fabric was made.
The woven fabric is immersed in a methyl alcohol solution of phenol resin (solid content 27%)
and then dried for about 2 hours, and a solution of butyl acrylate diluted with ethyl alcohol is
further coated on the woven fabric with a knife coater to a certain thickness. And dried in warm
air to prepare a support member sheet having a basis weight of 195 g / m 2 and a density of
0.28 g / cm 3.
The sheet was then pressure molded at 130 DEG C. for 20 seconds to produce a vibration system
supporting member of Example 2 having a density of 0.39 g / cm @ 3.
[0020]
In Example 3, a solution obtained by diluting butyl acrylate with ethyl alcohol is applied with a
knife coater to a constant thickness to a woven fabric in which polyurethane elastomer long
fibers (1000 filaments) having a fiber diameter of 7 to 10 μm are plain weave with a fiber
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density of 24 / cm. And dried under warm air, and then pressurized at 130 ° C. for 10 seconds
to prepare an intermediate molded product a having a basis weight of 100 g / m 2. Next, a
woven fabric obtained by plain-weaving an aromatic polyamide resin fiber (number 30) at a fiber
density of 24 / cm is immersed in a methyl alcohol solution (solid content 27%) of a phenol resin
and hot air dried for about 2 hours The resultant was pressed at 200.degree. C. for 10 seconds to
prepare an intermediate formed product b having a basis weight of 96 g / m.sup.2. Then, the
intermediate molded product a and the intermediate molded product b are overlapped in two
layers with their yarn direction shifted by 45 degrees, and this is pressure molded at 150 ° C.
for 10 seconds to obtain Example 3 with a density of 0.30 g / cm 3. The vibration system
support member of
[0021]
In Example 4, a polyurethane elastomer long fiber (shown as TPU 1) (1000 filaments) having a
fiber diameter of 7 to 10 μm and a glass transition temperature (Tg) of −10 ° C. and a glass
transition temperature (Tg) of 26 ° C. A polyurethane elastomer long fiber (shown as TPU 2)
(1000 filaments) with a fiber diameter of 7 to 10 μm was plain-woven at a fiber density of 24 /
cm so that the warp and weft alternate, and a woven fabric with a basis weight of 80 g / m 2 was
produced. . Further, a solution obtained by diluting butyl acrylate with ethyl alcohol is coated on
the woven fabric with a knife coater to a constant thickness and dried with warm air to obtain a
support member sheet having a basis weight of 125 g / m 2 and a density of 0.19 g / cm 3.
Made. Next, this sheet was pressure-molded at 130 DEG C. for 20 seconds to prepare a vibration
system supporting member of Example 4 having a density of 0.25 g / cm @ 3.
[0022]
Next, the physical properties of the vibration system support member according to the
embodiment of the present invention and the conventional vibration system support member are
shown in Table 1.
[0023]
Here, in Table 1, Conventional Example 1 is a molded urethane foam, Conventional Example 2 is
a molded thermoplastic polyurethane elastomer film, and Conventional Example 3 is a molded
SBR coated aromatic polyamide fiber woven fabric. Also, loss tangent (Tan δ) is a measured
value at 20 ° C. measured by a visco-elasticity measuring apparatus, and weather resistance is
subjected to a 1000 hour ultraviolet irradiation test with a xenon fade tester under 60% humidity
conditions. The result shows that the use limit temperature indicates the limit temperature at
which the necessary properties as a vibration system support member can be maintained.
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[0024]
As apparent from Table 1, in Example 1, the elastic elongation is close to that of the urethane
foam and excellent in stretchability, the loss tangent (Tan δ) is as large as that of the
thermoplastic polyurethane elastomer film, and the weather resistance is good. The property as a
vibration system support member is maintained to about 120 ° C.
[0025]
Also, in Examples 2 and 3, elastic elongation is slightly inferior to Example 1, but still sufficiently
large and sufficient stretchability is sufficient, loss tangent (Tan δ) is as large as thermoplastic
polyurethane elastomer film, and weather resistance is It is particularly excellent, and the
property as a vibration system support member can be maintained up to about 150 ° C.
[0026]
Next, FIG. 1 shows the temperature dispersion of loss tangent (Tan δ) of Example 4 which is a
mixed woven fabric of two types of polyurethane elastomer long fibers (TPU1, TPU2).
[0027]
From FIG. 1, in Example 4, by mixing TPU1 and TPU2, in the temperature dispersion
characteristics of loss tangent (Tan δ), an intermediate characteristic of the characteristics
possessed by TPU1 and TPU2 was obtained.
Therefore, although a slight peak is observed at each of the glass transition temperatures (Tg) of
TPU1 and TPU2, the entire characteristics are relatively flat.
From this characteristic, it is understood that Example 4 has a sufficiently large loss tangent (Tan
δ) over a wide temperature range.
[0028]
Although the vibration system support member of the electroacoustic transducer according to
the present invention has been described in detail based on the embodiment considered to be
representative, the embodiment of the vibration system support member according to the
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present invention is, for example, thermoplastic elastomer long fiber The present invention is not
limited to the structure of the above example, such as not limited to a polyurethane system,
provided that it has the configuration requirements described in the above-mentioned claims,
exhibits the effect of the present invention, and has the effects described below. , And can be
implemented by modifying as appropriate.
[0029]
The vibration system support member of the electroacoustic transducer according to the present
invention has sufficient elasticity necessary for amplitude linearity as a support member by using
thermoplastic elastomer long fibers, and this support member It has a large internal loss needed
to prevent the resonance caused by itself.
[0030]
Also, those composed of thermoplastic elastomer long fibers and cotton fibers or aromatic
polyamide fibers are particularly excellent in weather resistance such as heat resistance, and
those composed of thermoplastic elastomers having different glass transition temperatures It has
a large internal loss over a wide temperature range.
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