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JPH05101963

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DESCRIPTION JPH05101963
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic condenser used in acoustic equipment.
[0002]
2. Description of the Related Art In recent years, in the audio equipment industry, with the
digitization of audio equipment, high-quality sound is rapidly being developed.
[0003]
Particularly in recent years, the volume of mid- and low-range voices is rich, and high-frequency
sounds are appropriately suppressed, and flexible and easy-to-listen sounds are the mainstream
in the industry, and research and development are actively conducted to reproduce their sound
quality. It is
[0004]
Therefore, there is a strong demand for improvement of the sound quality performance also for
the capacitor which is an electronic component.
[0005]
In order to improve the sound quality performance of the capacitor, it is fundamental to realize a
capacitor element that faithfully transmits the signal waveform.
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[0006]
That is, it is to realize an ideal capacitor element in which the series resistance is zero, there is no
change in capacitance with frequency, and the current is always advanced by 90 °.
[0007]
Specifically, it is considered preferable to use a low-loss, low-resistance material for materials
such as dielectrics, electrodes, lead wires, or to make it difficult to vibrate the element structure.
The film capacitor used is a dielectric film having low electrical loss such as polypropylene or
polyphenylene sulfide, copper having a high specific gravity for the electrode material and low
resistivity, tin or the like, and a lead wire The sound quality performance has been improved by
devising the materials of the dielectric, electrode and lead wire by using an oxygen-free copper
wire for each.
[0008]
However, when this type of acoustic condenser is actually used in an acoustic device, the sound
quality of the sound heard from the speaker is improved, but the amount of mid-range is poor,
and it is balanced. It is a big problem that the sound in the high region is emphasized and the
sound is hard and easy to be tired of listening.
[0009]
The present invention solves such a conventional problem, and an acoustic capacitor with
excellent sound quality performance in which mid-range sounds are heard in a well-balanced
manner, high-frequency sounds are appropriately suppressed, and sounds are flexible and do not
get tired of listening Intended to be provided.
[0010]
SUMMARY OF THE INVENTION In order to achieve the above object, the acoustic capacitor of
the present invention has a true specific gravity of 1.8 to 2.1 in its exterior, and it is at 150 ± 1
° C. according to JIS C2104. It is the composition using the exterior powder resin material
whose gelation time is 200 to 250 seconds, and the composition of the powder resin material
uses 70 to 200 parts by weight of inorganic powder as a filler with respect to 100 parts by
weight of epoxy resin. And, 30% by weight or more of the filler is composed of titanium oxide.
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In addition, an oxygen-free copper wire having a wire diameter of φ0.8 mm or more is used as a
material of the lead wire.
[0011]
The acoustic capacitor of the present invention has a true specific gravity of 1.8 to 2.1 as
compared with the conventional filler-containing epoxy powder resin, by blending the filler of
specific gravity into the external powder resin material. It uses a material with an increased true
specific gravity.
[0012]
The conventional epoxy powder resin contains calcium carbonate (true specific gravity 2.6 to
2.7), silica (true specific gravity 2.5 to 2.7), and aluminum hydroxide (true specific gravity 2. It
consists of what was used 70-120 weight parts with respect to 100 weight parts of epoxy resins
using 3-2.4 etc., and true specific gravity was 1.4-1.8.
[0013]
The present invention uses 70 to 200 parts by weight of a filler with respect to 100 parts by
weight of an epoxy resin, and 30% by weight or more of the filler uses titanium oxide (true
specific gravity 4.2) having a large true specific gravity. Thus, a material having a true specific
gravity of 1.8 to 2.1 can be obtained.
[0014]
The titanium oxide of 30% by weight or more may be 100% by weight of the total amount, and
may be used in combination with a conventionally used filler.
[0015]
If the true specific gravity is less than 1.8, the weight of the capacitor itself is reduced when the
exterior is applied, the sound quality performance is poor, and if the true specific gravity exceeds
2.1, the flow of the coating method usually used is too heavy. It can not be used industrially
because it does not flow in the immersion method or the spray method.
[0016]
Therefore, by using an exterior powder resin having a true specific gravity of 1.8 to 2.1, when
the exterior is applied, the weight of the film capacitor itself becomes heavy, and as a result, the
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vibration of the capacitor element can be reduced.
[0017]
Moreover, as for the conventional package powder resin, a material having a gelation time of 40
to 150 seconds at 150 ± 1 ° C. according to JIS C2104 has generally been used.
On the other hand, in the present invention, a material having a gelation time of 200 to 250
seconds is used, and if it is less than 200 seconds, the curing of the resin is fast and the sound
quality performance is poor due to curing strain. Is not industrially useful because it takes a long
time to cure and the productivity is poor.
[0018]
Therefore, by using an exterior powder resin having a gelation time of 200 to 250 seconds at
150 ± 1 ° C., the curing reaction rate can be delayed in the baking and curing process of the
exterior resin as compared with the conventional exterior powder resin. As a result, mechanical
stress to the capacitor element due to distortion at the time of resin curing can be suppressed.
[0019]
Furthermore, the reduction of the gap layer between the capacitor element and the exterior resin
can reduce the vibration of the capacitor element.
[0020]
In addition, by using an oxygen-free copper wire having a wire diameter of 0.8 mm or more as
the lead wire material, the resistance per unit length of the lead wire can be reduced, and the
printed circuit board of the capacitor element is obtained. Since the holding force with respect to
is improved, the vibration of the capacitor element can be reduced.
[0021]
As described above, by suppressing the mechanical stress and vibration of the capacitor element
and reducing the resistance of the lead wire, the distortion of the electrical signal and the loss of
the signal can be reduced and suppressed. Performance can be greatly improved.
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[0022]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An acoustic capacitor according to
an embodiment of the present invention will be described below with reference to the drawings.
[0023]
FIG. 1 shows the structure of an embodiment of an acoustic film capacitor according to the
present invention, in which a polypropylene film 1 and an aluminum foil 2 are alternately
stacked and wound alternately to form an oval-shaped non-inductive winding structure. An
oxygen free copper wire 3 with a diameter of φ 0.8 mm is spot welded on the end face of the
film capacitor element by two points, and then impregnated into the film capacitor element body
with the low viscosity liquid epoxy resin 4 for impregnation and cured. The exterior is provided
with a resin 5.
[0024]
The exterior powder resin 5 is 100 parts by weight of bisphenol A epoxy resin having an epoxy
equivalent of 850 to 1000, 70 parts by weight of titanium oxide with a particle diameter of 2
μm or less as filler, 50 parts by weight of calcium carbonate, and diaminodiphenylmethane as a
curing agent 7 parts by weight, 5 parts by weight of copper phthalocyanine blue as a color
pigment, and 2 parts by weight of acrylic resin Motaflow as a surface smoothing agent, and they
are kneaded and crushed in an extruder, and this exterior powder resin has a true specific gravity
The gelation time at 150 ± 1 ° C. according to JIS C2104 of 1.84 was 227 seconds.
The exterior was applied by a fluid immersion coating method, and baked and cured at 100 ° C.
for 3 hours to obtain a film capacitor.
[0025]
FIG. 2 shows that when the above-described one embodiment of the present invention and the
conventional acoustic film capacitor are actually used for the emphasis de-emphasis circuit of a
CD player, the "high frequency dropout" and "high frequency loss" will be described. "Tightening",
"mid-range volume", "low-range volume", "low-range growth", "distortion", "sound", "rise",
"resolution", "softness of sound", It shows the result of actually listening and evaluating over 11
items of "Balance of sound".
[0026]
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Here, the conventional product uses an oxygen-free copper wire with a wire diameter of φ 0.6
mm for the lead wire, a material having a true specific gravity of 1.67, and a gelation time of 59
seconds at 150 ± 1 ° C. for the exterior powder resin. In the product of the present invention,
only the wire diameter of the lead wire and the exterior resin material were changed so as to be
easy to compare with the conventional product, and the other parts were designed the same.
[0027]
As clearly shown in FIG. 2, the acoustic film capacitor according to the embodiment of the
present invention is improved particularly in the midrange and the softness of the sound
compared with the conventional product, and the sound quality performance is greatly improved.
There is.
[0028]
This is because the specific gravity of the external powder resin material is increased by blending
a specific filler, and when the external structure is applied, the capacitor itself is heavy and
vibration can be reduced, and 150 ± 1 of the external powder resin. By lengthening the gelation
time in ° C. to 227 seconds as compared with the conventional powder resin, it is possible to
suppress the mechanical stress to the capacitor element due to the distortion at the time of resin
curing, and further, the gap between the capacitor element and the exterior resin By reducing the
layers, the vibration of the capacitor element can be reduced, and as a result, the occurrence of
distortion of the electric signal can be reduced and suppressed, and the sound quality
performance is greatly improved.
[0029]
Furthermore, by making the lead wire diameter larger than that of the conventional product, the
resistance of the lead wire can be reduced, and the retention of the capacitor element to the
printed circuit board is improved. As a result, the occurrence of distortion of the electrical signal
and the loss of the signal are reduced and suppressed, and the sound quality performance is
greatly improved.
[0030]
As described above, according to the acoustic capacitor of the present invention, a material
having a large true specific gravity and a long gelation time is used as the exterior resin material,
and an oxygen-free copper having a large wire diameter as the lead wire. By using the wire,
mechanical stress and vibration to the capacitor element can be suppressed, and further, the
resistance of the lead wire can be reduced, and as a result, the generation of electrical signal
distortion and the loss of signal can be reduced and suppressed. Thus, it becomes possible to
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provide high-quality sound that can be heard in a rich sense of volume in the middle range, yet
flexible and easy to hear.
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