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JP2011217281

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DESCRIPTION JP2011217281
A central holding member which is easy to manufacture, excellent in low temperature
regeneration ability, and excellent in durability, cold resistance and heat resistance is
manufactured. A composite 3 is formed by covering at least one entire surface of a reinforcing
material 1 made of chemical fibers with a thermoplastic elastomer material 2 and closely
arranging the thermoplastic elastomer material 2 on fiber yarns of chemical fibers. Since the
damper 4 and the edge 5 are manufactured using this combined body 3, the damper 4 and the
edge 5 excellent in durability, cold resistance and heat resistance can be manufactured. The
damper 4 and the edge 5 are excellent in low-pass reproduction ability, and are less likely to be
deformed due to the change with time, so that it is possible to provide a speaker with a small
change rate of the lowest resonance frequency. [Selected figure] Figure 1
Speaker center holding member, speaker using the same, and method of manufacturing the
speaker center holding member
[0001]
The present invention relates to a speaker center holding member such as a damper and an edge,
a speaker using the same, and a method of manufacturing the speaker center holding member.
[0002]
As the size of the speaker becomes smaller, the width of the edge becomes narrower, and a
thinner, soft material is required to secure a low frequency reproduction band.
12-05-2019
1
In recent years, in addition to securing the low frequency reproduction band, an increase in input
resistance is also required. For this reason, many small speakers are increasingly using
thermoplastic elastomers as the edge material.
[0003]
The use of a thermoplastic elastomer makes it possible to form the edge thinner and softer, but
with it, various problems occur in terms of durability, cold resistance and heat resistance.
[0004]
On the other hand, many dampers are used which are formed by hot pressing a cloth material
impregnated with a phenol resin, a melamine resin or the like.
In the damper for a small speaker, the amount of resin impregnated in the cloth material is
reduced and the cloth material is made thin and soft in order to secure a low frequency
reproduction zone. The cloth material subjected to such treatment is easily fatigued, and while
the speaker is used, the damper becomes softer than in the initial state, and the change rate of
the minimum resonance frequency of the speaker may be increased.
[0005]
In patent document 1, the vibration type | system | group supporting member which is excellent
in environmental resistance and easy to manufacture is used, without using a phenol resin. This
vibration system support member is obtained by placing a hot melt web on at least one side of a
fiber base made of a woven fabric or a non-woven fabric, and heat pressing it into a
predetermined shape. There is no impregnation step, and the softness is adjusted by superposing
the hot melt web.
[0006]
Patent Document 2 discloses a damper formed by injection molding using a thermoplastic
elastomer material to form a damper main body, and insert molding formed by sandwiching a
mesh material between two damper main bodies.
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2
[0007]
Patent Document 3 discloses a speaker damper formed by impregnating a base fabric made of a
natural fiber or a synthetic fiber with a curable resin, and further coating a rubber elastic resin to
form the same.
The bond of the intersection points of the yarns forming the base fabric is reinforced by the
coating process of the rubber elastic resin, and the durability is improved and the flexibility is
imparted to suppress the wrinkles and the overlap at the time of molding to improve the
moldability. And improve durability.
[0008]
JP, 2001-359190, A JP, 2003-97641, A JP, 2000-184494, A
[0009]
In the vibration system support member of Patent Document 1, the base material is a fiber, and a
hot melt web is mounted thereon in order to be formed into a desired shape, but there is no
disclosure of a specific material of the hot melt, and processing It is unclear what the nature,
durability, cold resistance, heat resistance and bass reproduction ability are.
In the first place, Patent Document 1 is an invention taking into consideration adverse effects on
the human body and environmental pollution, and processability, durability, cold resistance, heat
resistance, bass reproduction ability and the like are not in mind.
[0010]
Moreover, the damper of patent document 2 is inject-molding a thermoplastic elastomer material,
and has shape | molded the damper main body which has a suspension lever. This damper body
is an improvement of a so-called butterfly damper, and its shape is complicated, so there is a limit
to miniaturization. Moreover, the damper main body is not a structure that covers the entire
surface of the mesh material, and can not be said to be very good in terms of durability.
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3
[0011]
Furthermore, since the damper of Patent Document 3 impregnates the base cloth with the
curable resin, and further coats the rubber elastic resin for heat molding, the manufacturing
process is complicated and the manufacturing cost becomes high.
[0012]
The present invention has been made in view of the above problems, and an object thereof is a
speaker such as a damper and an edge which is easy to manufacture, is excellent in lowtemperature reproducing ability, and is also excellent in durability, cold resistance and heat
resistance. A central holding member, a speaker using the same, and a method of manufacturing
the central holding member for a speaker.
[0013]
In order to solve the above problems, according to one aspect of the present invention, a damper
attached to a voice coil bobbin of a speaker, an inner peripheral side is joined to a diaphragm of
the speaker, and an outer peripheral side is joined to a frame of the speaker An edge, at least one
of the damper and the edge, a sheet-like reinforcing material made of thermoplastic chemical
fiber, covering at least one surface of the reinforcing material, and each fiber yarn of the
chemical fiber And a sheet member made of a thermoplastic elastomer disposed in close contact
with each other.
[0014]
Further, according to an aspect of the present invention, at least one surface of the reinforcing
material is formed by hot-press forming a sheet-like reinforcing material made of a chemical
chemical fiber and a sheet member made of a thermoplastic elastomer. Forming a bonded body
by covering with a sheet member and closely arranging the thermoplastic elastomer on each
fiber yarn of the chemical fibers, and forming the bonded body according to the shape of a
damper or an edge, There is provided a method of manufacturing a center holding member for a
speaker, the method comprising the steps of:
[0015]
According to the present invention, it is possible to manufacture a centering member which is
easy to manufacture, excellent in low-temperature regeneration ability, and excellent in
durability, cold resistance and heat resistance.
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4
[0016]
The figure explaining the structure of the center holding member which concerns on this
embodiment.
(A) is a top view of damper 4 formed using combination object 3 of Drawing 1, and (b) is a
sectional view of damper 4.
FIG. 2 is a cross-sectional view of an edge 5 formed using the combination 3 of FIG. 1;
The figure explaining the modification of FIG.
(A) is sectional drawing which shows the state which laminated | stacked the thermoplastic
elastomer material 2 on both surfaces of the reinforcing material 1 before pressing, (b) is
sectional drawing of the joint body 3a obtained by pressing.
Sectional drawing of the speaker 10 incorporating the damper 4 and the edge 5 which were
produced by the manufacturing method of this embodiment. Sectional drawing which shows an
example of the speaker which has the center holding member 4e. The figure which shows the
result of having measured the change rate of the lowest resonant frequency f0, giving the input
of 6W and 8W about the speaker which each used the conventional damper 4 and the damper 4
of a present Example. (A) is a figure which shows the result of having conducted the continuous
operation test about the speaker using the conventional damper 4, (b) does the continuous
operation test about the speaker using the damper 4 of a present Example Showing the results.
[0017]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0018]
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5
FIG. 1 is a view for explaining the structure of a centering member according to the present
embodiment.
Here, the center holding member indicates at least one of a damper attached to the voice coil
bobbin of the speaker and an edge of which the inner peripheral side is joined to the diaphragm
of the speaker and the outer peripheral side is joined to the frame.
[0019]
The centering member shown in FIG. 1 has a structure in which the entire surface of a sheet-like
reinforcing material 1 made of thermoplastic chemical fiber is covered with a sheet material
made of thermoplastic elastomer, and this structure is hereinafter referred to as a bonded body 3
. The combined body 3 is die-cut according to the shapes of the damper 4 and the edge 5.
[0020]
2 (a) is a plan view of a damper 4 formed using the combined body 3 of FIG. 1, and FIG. 2 (b) is a
cross-sectional view of the damper 4. As shown in FIG. FIG. 3 is a cross-sectional view of an edge
5 formed using the combination 3 of FIG.
[0021]
The thickness of the sheet member of the thermoplastic elastomer shown in FIG. 1 (hereinafter
referred to as a thermoplastic elastomer material 2) is about 0.01 to 1 mm, preferably 0.05 to
0.5 mm. When the thickness exceeds 1 mm, the flexibility of the thermoplastic elastomer
material 2 is impaired, and when the thickness is less than 0.01 mm, the bonding property with
the reinforcing material 1 is deteriorated.
[0022]
The hardness of the thermoplastic elastomer material 2 measured using a rubber hardness tester
is about 40 ° to 90 °, preferably 65 ° to 80 °.
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[0023]
The chemical fiber that is the material of the reinforcing material 1 is a fiber such as polyester or
acrylic, and it is preferable that the melting temperature be higher than that of the thermoplastic
elastomer material 2.
As described later, the thermoplastic elastomer material 2 is melted and the thermoplastic
elastomer material 2 is closely fixed around the fiber yarn of the chemical fiber.
[0024]
When a plain weave woven fabric is used as the reinforcing material 1, for example, the weight
ratio to the thermoplastic elastomer material 2 is about 1/2 to 1/25 (preferably 1 / 2.5 to 1/15),
and the volume ratio is about 1/1. 2 to 1/30 (preferably 1/4 to 1/15) is desirable.
[0025]
The reinforcing material 1 is formed into a cloth (woven fabric), a non-woven fabric or a mesh by
using fiber yarns of thermoplastic chemical fibers, and its thickness is about 0.04 to 0.5 mm. The
thickness is substantially the same as that of the plastic elastomer material 2.
[0026]
The combined body 3 consisting of the reinforcing material 1 and the thermoplastic elastomer
material 2 may be formed using an insert molding machine, but taking into consideration that
the thickness is thin and that the thermoplastic elastomer material 2 is melted. Preferably, the
reinforcing material 1 and the thermoplastic elastomer material 2 are placed in a hot-press
cooling mold in a state where they are stacked on each other, and are subjected to heating and
pressure pressing to form a bonded body 3.
[0027]
According to this manufacturing method, the thermoplastic elastomer material 2 is melted to
wrap around the fiber yarns of the reinforcing material 1, and a bonded body 3 having a shape
conforming to the shape of the heat and pressure cooling mold is obtained.
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That is, the bonded body 3 of the outer shape of the damper 4 can be obtained by the heat
pressure cooling mold for the damper 4, and the bonded body 3 of the outer shape of the edge 5
is obtained by the heat pressure cooling mold for the edge 5. Can.
[0028]
FIG. 4 is a modification of FIG. 1 and shows an example in which the thermoplastic elastomer
material 2 is disposed on both sides of the reinforcing material 1 and pressing is performed so as
to sandwich the reinforcing material 1 between these two thermoplastic elastomer materials 2. It
shows.
The combined body 3a obtained by FIG. 4 is more durable than the combined body 3 of FIG.
Further, in FIG. 4, each thermoplastic elastomer material 2 can be thinned by the amount of
using two thermoplastic elastomer materials 2.
[0029]
FIG. 5 (a) is a cross-sectional view showing a state in which the thermoplastic elastomer material
2 is superposed on both sides of the reinforcing member 1 before pressing, and FIG. 5 (b) is a
combined body 3a obtained by pressing. FIG. In FIG. 5 (a), the reinforcing material 1 and the
thermoplastic elastomer material 2 form separate layers, but in FIG. 5 (b), the thermoplastic
elastomer material 2 is melted and fiber yarns of the reinforcing material 1 are produced. It can
be seen that the thermoplastic elastomer material 2 is placed in intimate contact so as to wrap
around it, and the reinforcing material 1 and the thermoplastic elastomer material 2 are
integrated.
[0030]
Thus, the combined body 3 of the present embodiment is one in which the reinforcing material 1
and the thermoplastic elastomer material 2 are integrated, and the durability, the cold resistance,
and the heat resistance can be improved, and the bass reproducing ability is improved. You can
also plan.
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[0031]
If you want to adjust the thickness and hardness of the thermoplastic elastomer material 2 more
finely, prepare two thermoplastic elastomer materials 2 with different thickness and hardness,
and put these on both sides of the reinforcing material 1 as shown in FIG. By arranging and
pressing, the thickness and hardness corresponding to the combination of the two thermoplastic
elastomer materials 2 can be obtained.
FIG. 5A described above shows an example in which two sheets of thermoplastic elastomer
material 2 having different thicknesses are disposed so as to sandwich the reinforcing material 1.
[0032]
FIG. 6 is a cross-sectional view of the speaker 10 incorporating the damper 4 and the edge 5
manufactured by the manufacturing method of the present embodiment. The speaker 10 of FIG.
6 includes a magnetic circuit 11, a frame 12, a voice coil bobbin 13, a voice coil 14, a diaphragm
15, a damper 4, and an edge 5.
[0033]
The magnetic circuit 11 has a pot yoke 21, a magnet 22 and a pole piece 23. The magnetic
circuit 11 is fixed to the frame 12, and the voice coil 14 wound around the voice coil bobbin 13
is held in the gap of the magnetic circuit 11. The inner peripheral portion of the damper 4 is
fixed to the voice coil bobbin 13, and the outer peripheral portion of the damper 4 is joined to
the frame 12. The diaphragm 15 is joined to the front surface of the voice coil bobbin 13. The
inner periphery of the edge 5 is joined to the outer periphery of the diaphragm 15, and the outer
periphery of the edge 5 is joined to the frame 12.
[0034]
In addition, only one of the damper 4 and the edge 5 in FIG. 6 may be manufactured by the
above-described manufacturing method, and the other may be manufactured by the same
manufacturing method as the conventional, and both the damper 4 and the edge 5 are
manufactured by the above-described manufacturing method May be
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9
[0035]
As described above, in the present embodiment, the entire surface of at least one of the
reinforcing material 1 made of chemical fibers is covered with the thermoplastic elastomer
material 2 and the thermoplastic elastomer material 2 is disposed closely to the fiber yarns of the
reinforcing material 1 Since the combined body 3 is formed and the damper 4 and the edge 5 are
manufactured using this combined body 3, the damper 4 and the edge 5 excellent in durability,
cold resistance and heat resistance can be manufactured.
[0036]
Moreover, the damper 4 and the edge 5 manufactured by the manufacturing method of the
present embodiment are excellent in the low-frequency reproduction ability, and are less likely to
be deformed due to the change with time, so that a speaker with a small change rate of the
lowest resonance frequency can be provided.
[0037]
Furthermore, in the present embodiment, the combined body 3 of the outer shape of the damper
4 or the edge 5 is obtained only by overlapping the reinforcing material 1 and the thermoplastic
elastomer material 2 and putting them in a heat pressure cooling mold and heating and pressing.
Since the damper 4 and the edge 5 can be produced extremely easily, the manufacturing cost can
be reduced, and the damper 4 and the edge 5 having a small diameter can be produced.
[0038]
Moreover, since the combination 3 of the present embodiment is not complicated in shape, it is
not necessary to prepare an expensive mold.
Moreover, the conventional resin impregnation step and coating step are not necessary, and the
manufacturing process can be simplified.
[0039]
In the embodiment described above, an example in which the damper 4 or the edge 5 is
manufactured has been described, but the so-called center holding in which the damper 4 and
the diaphragm 15 are integrally formed or the damper 4 and the edge 5 are integrally formed
12-05-2019
10
The manufacturing method of the present embodiment can be applied to the manufacture of a
member.
[0040]
FIG. 7 is a cross-sectional view showing an example of a speaker having a center holding member
4e.
The speaker 10a of FIG. 7 has a center holding member 4e in which the damper portion 4a and
the vibrating portion 4d are integrated.
The fixed portion 4b formed at the central portion of the damper portion 4a is disposed on the
rear side of the speaker 10a, and a through hole 4c is formed at the center of the bottom portion
of the fixed portion 4b.
A vibrating portion 4d is integrally formed on the outer peripheral side of the damper portion 4a,
an edge 5 is joined to a tip end portion of the vibrating portion 4d, and a dust cap 16 is attached
to a front surface of the voice coil bobbin 13.
[0041]
At least one of the center holding member 4e and the edge 5 in FIG. 7 can be manufactured by
the above-described manufacturing method, whereby a speaker 10a excellent in durability, cold
resistance and heat resistance can be obtained.
[0042]
First Example The present inventor uses a 40 mm aperture speaker having the structure of FIG.
6, a damper manufactured by the conventional manufacturing method, and a damper 4
manufactured by the above manufacturing method (hereinafter referred to as the damper 4 of
this embodiment) ) Were incorporated, respectively, to compare the lowest resonance frequency
f0.
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11
A common member was used except for the damper 4, and the edge 5 was also made by the
conventional manufacturing method.
[0043]
The conventional damper 4 to be compared is a plain weave with a thickness of 0.25 mm of
polyester fiber and a yarn count of 80 warps × 70 wefts, and has a thickness of 0.25 mm, and is
impregnated with phenol. Molded.
[0044]
The damper 4 of the present embodiment has a thickness of 0.025 mm of yarn of polyester fiber
as the reinforcing material 1 in a urethane thermoplastic elastomer of 0.05 mm, 300 warps and
300 wefts / inch, It is molded by plain weave of 0.044 mm.
[0045]
FIG. 8 performs a noise test of 6 W and 8 W according to JIS C5552 for 100 hours on a speaker
using the conventional damper 4 and the damper 4 of the present embodiment, and measures
the lowest resonance frequency f0 before and after the test. It is the figure which showed the
change rate (%) of f0.
[0046]
It can be seen that the damper 4 of this embodiment has a significantly smaller change rate than
the conventional damper 4.
In particular, in the case of the conventional damper 4, when an input of 8 W was applied, an
abnormal sound was generated and the sound quality became apparent.
Both the conventional damper 4 and the damper 4 of this embodiment have a smaller change
rate as the input is smaller, but even if the damper 4 of this embodiment gives a high input of 8
W, the change rate is only 11.5% It turns out that it is sufficiently practical.
[0047]
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12
FIG. 9A shows a result of a test (continuous operation test) in which an input of 6 W is
continuously given and operated with respect to the speaker using the conventional damper 4
described above.
FIG. 9 (b) is a diagram showing the results of the same continuous operation test performed on
the speaker using the damper 4 of the present embodiment described above.
In these figures, curves of the sound pressure frequency characteristic [dB] and impedance
characteristic [Ω] of the speaker at 1 W / 1 m are shown, and the solid line in the figure is the
curve before the test and the broken line is the curve after the test. Is shown.
[0048]
As shown in FIG. 9A, in the conventional damper 4, both the sound pressure frequency
characteristic and the impedance characteristic largely change before and after the continuous
operation test. On the other hand, in the damper 4 of the present embodiment, as shown in FIG.
9B, both the sound pressure frequency characteristic and the impedance characteristic hardly
change before and after the continuous operation test.
[0049]
From the above results, it can be seen that the damper 4 of the present embodiment is
significantly superior to the conventional damper 4 in terms of durability.
[0050]
Second Embodiment Next, the inventor of the present invention has made the speaker with the
aperture of 40 mm of the structure of FIG. The low temperature operation test was carried out by
respectively incorporating 5).
Under an atmosphere of -30.degree. C., a test of giving a noise of 5 W for 10 minutes and leaving
for 50 minutes was conducted for a total of 96 hours. A common member was used except for
the edge 5, and the damper 4 also used a conventional method.
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13
[0051]
Urethane based materials are known to be prone to problems when used at low temperatures.
Therefore, the urethane thermoplastic elastomer material 2 (rubber strength 65 °) having a
thickness of 0.05 mm was used for the conventional edge 5. The edge 5 of this example is a
reinforcing material 1 (thickness 0.044 mm, thickness of fiber yarn 0.025 mm, number of yarns
wound 300) formed of polyester chemical fiber in urethane thermoplastic elastomer material 2
having a thickness of 0.05 mm. This product is obtained by pressure-pressing a book x a weft of
300 yarns / inch. In the edge 5 of this example, the volume ratio of the reinforcing material 1 to
the thermoplastic elastomer material 2 was 1⁄5.
[0052]
As a result of conducting the above-mentioned low temperature operation test, in the speaker
using the conventional edge 5, the edge 5 was broken in the vicinity of the bonded portion of the
diaphragm 15 and the edge 5 within 12 hours after the start of the test. On the other hand, in the
speaker using the edge 5 of this example, breakage of the edge 5 did not occur even after 96
hours from the start of the test.
[0053]
From the results of the above main test, it is understood that the edge 5 of the present example is
also excellent in cold resistance.
[0054]
Third Example Next, as in the second embodiment, the inventor made comparisons of hightemperature operation tests using two types of speakers differing only in the edge 5.
Under an atmosphere of 80 ° C., a noise signal of 5 W was applied for 10 minutes, and a test of
leaving for 50 minutes was conducted for a total of 96 hours.
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14
[0055]
In the present embodiment, an olefin-based material that is more likely to cause problems with
heat resistance than cold resistance when softened is used as the base material of the
conventional edge 5 and the edge 5 of the present embodiment. Specifically, in the conventional
edge 5, an olefin thermoplastic elastomer material 2 (rubber strength 65 °) having a thickness
of 0.18 mm was used. The edge 5 of this example is a reinforcing material 1 (thickness 0.044
mm, thickness of fiber yarn 0.025 mm, number of yarns wound) formed of polyester chemical
fiber in the same 0.18 mm thick olefin thermoplastic elastomer material 2 A plain weave of 300
× 300 wefts / inch) is pressed. Also in the edge 5 of this example, the volume ratio of the
reinforcing material 1 to the thermoplastic elastomer material 2 was 1⁄5.
[0056]
As a result of conducting the above-mentioned high temperature operation test, in the speaker
using the conventional edge 5, the edge 5 was broken in the vicinity of the bonding portion of
the diaphragm 15 and the edge 5 within 18 hours after the start of the test. In the speaker using
edge 5 of this example, breakage of edge 5 did not occur even after 96 hours from the start of
the test.
[0057]
From the results of the above main test, it is understood that the edge 5 of the present example is
also excellent in heat resistance.
[0058]
The aspects of the present invention are not limited to the above-described individual
embodiments and examples, but also include various modifications that those skilled in the art
can conceive, and the effects of the present invention are not limited to the contents described
above.
That is, various additions, modifications and partial deletions can be made without departing
from the conceptual idea and spirit of the present invention derived from the contents defined in
the claims and the equivalents thereof.
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[0059]
DESCRIPTION OF SYMBOLS 1 Reinforcement material 2 Thermoplastic elastomer material 3
Combined body 4 Damper 5 Edge 11 Magnetic circuit 12 Frame 13 Voice coil bobbin 14 Voice
coil 15 Diaphragm 21 Pot yoke 22 Magnet 23 Pole piece
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