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JPH09247789

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH09247789
[0001]
FIELD OF THE INVENTION The present invention is a fiber material having a high denier value,
which has not been adopted until now, as a warp yarn and a weft yarn tightly packed in plain
weave, regularly and intermittently bundled or thick A special weave method in which single
yarns are arranged longitudinally and transversely, with a small number of pinholes, thin
thickness, light weight, high density, high Young's modulus, high propagation speed, high
internal loss The present invention relates to a speaker diaphragm having physical properties.
[0002]
2. Description of the Related Art A conventional speaker diaphragm of this type is a plain weave
material in which natural fibers such as cotton and silk having the same thickness are used as
warp and weft, and woven with a phenolic resin for adjusting hardness. It was impregnated,
heated and solidified to form a solid, which was then coated with an acrylic resin, a urethane
resin or the like and sealed to form a diaphragm.
[0003]
Therefore, the conventional speaker diaphragm of this type has a low inherent rigidity of the
fibers and maintains the rigidity of the diaphragm by the rigidity due to the solidification of the
resin.
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1
Accordingly, the thickness of the resin directly becomes the thickness of the diaphragm, the
Young's modulus is small, and further, since the internal loss (tan δ) value does not increase
since the phenol resin is used, a large number of irregularities in frequency characteristics are
generated. Because the propagation speed of is small, the reproduced sound pressure frequency
range is narrow, and resonance occurs as a vibration mode. And when it incorporates in a
speaker, since the mass of a diaphragm is large, there also existed a problem that conversion
efficiency is low and reproduction | regeneration sound pressure becomes low.
[0004]
Therefore, in the diaphragm of the present invention, the elongation of the fibers of the material
that composes the diaphragm is usually about 50% of that of the polyester yarn in order to solve
the problems that such a conventional diaphragm for a speaker had. As described above, by
performing super-stretching, tensile strength is increased, elongation is reduced, and a fine
denier fiber having a different weaving method from that of the conventional method is finely
punched into a plain weave, In the meantime, fibers with a large denier value are arranged
intermittently and regularly, and a special weave method in which high tension is woven into
yarns is optimal for Young's modulus, propagation speed, internal loss, etc. as a speaker
diaphragm. It is an object of the present invention to provide a diaphragm for a speaker which is
high in conversion efficiency and can improve the reproduction sound pressure by making it
lightweight.
[0005]
The constitution of the present invention for achieving the object will be described with
reference to FIGS. 1 to 5 corresponding to the embodiments. The present invention provides a
polyester yarn having a normal elongation. Using a polyester fiber 2 subjected to super-drawing
to 60% or less as the warp 2a and the weft 2b, the ratio of the number of strikes is regularly
punched to form a gland, and the longitudinal direction of the gland is Two to four singlefilament yarns of the above-mentioned super-stretched polyester fiber are aligned in the
widthwise direction as the warp yarn 2c of the ripstop portion, and two to four yarns are aligned
as the weft yarn 2d of the ripstop portion. Or a single yarn thicker than the above single yarn is
intermittently and regularly punched in and placed on a plain weave material and subjected to
resin processing for filling with a basis weight of 20 g / m 2 or less After, heated male and
female It is a diaphragm for an electroacoustic transducer which is directly heated, pressurized,
and molded by the molds 5a and 5b.
[0006]
In the present invention, the polyester fiber 2 subjected to the super-drawing process so that the
elongation is 60% or less of that of the normal polyester yarn is used as the warp 2a and the weft
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2
2b, and the ratio of the number of strikes is regular The ground portion is composed of 5 to 7
fibers / in in the longitudinal direction and 5 to 7 fibers / in in the lateral direction, with a width
of 30 to 50 deniers / 15 to 5 of the above-mentioned super-stretched polyester fiber A single
filament of 25 filaments is aligned by 2 to 4 as warp 2c in the ripstop portion, and 2 to 4 yarns
of 30 to 50 denier / 15 to 25 filaments are aligned as weft 2d in the ripstop portion Or a single
yarn of 100 to 140 denier / 20 to 30 filaments, each intermittently and regularly punched in,
and placed in a plain weave 2 to have a basis weight of 20 g / m 2 or less It is a diaphragm for an
electroacoustic transducer which has been subjected to resin processing for molding and brought
into close contact with the heated male and female molds 5a and 5b to be directly heated,
pressurized and molded.
[0007]
Since the present invention is configured as such, the following effects can be obtained.
[0008]
That is, (1) The ground portion of the diaphragm 1 of the present invention is flat-knitted by
finely inserting thin super-stretched polyester fibers as described above, and the material cloth
material 2 has a thin thickness, so it has a high surface The density can be maintained.
Therefore, since the gaps between the thin fibers 2a and 2b and between the thick fibers 2c and
2d are narrow and air tightness is maintained, there are few pinholes and no air leaks. It is
possible to carry out a resin processing process in which the amount of coating is reduced and
the frequency is reduced.
[0009]
(2)In addition, as described above, polyester thin fine denier fibers are arranged in a row, and
resin processing is performed with a small basis weight of 20 g / m 2 or less, so it is finished in
light weight and exhibits high conversion efficiency as a speaker. The speaker diaphragm 1 has a
high sound pressure, and the sound pressure is improved by about 2 to 3 dB as compared with
the conventional example.
[0010]
(3)
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In the diaphragm 1 of the present invention, the Young's modulus as the cloth 2 can be
maintained four times as high as that of the conventional example by the above-described
material and processing method, and the propagation speed is also approximately doubled.
As described above, although the Young's modulus is high, tan δ does not decrease, and the
physical constant of the material of the conventional diaphragm is different.
This is because the polyester fine fibers that have undergone the above-described superstretching process to significantly increase the Young's modulus without using a conventional
resin impregnating agent such as a phenolic resin are woven in a more linear and longitudinal
manner. It is due to the nature of the fabric 2 being present.
[0011]
Table 1 is a list of physical properties, such as density, Young's modulus, propagation speed and
internal loss, of various diaphragm materials of the diaphragm material of the present invention,
polyester cloth, wood pulp and polypropylene.
[0012]
As a result, since the material thickness of the material 2 of the diaphragm 1 of the present
invention is reduced to about 1⁄2, that is, the internal loss as a cross material becomes 1.4 times
and the internal loss (tan δ) is large. The Young's modulus as a sheet material is large, and it can
be said that a good balance can be maintained as a diaphragm material.
[0013]
In the diaphragm 1 of the present invention, the sound wave propagation velocity is
approximately doubled, the range of piston vibration of the diaphragm is doubled, and the
frequency of the clear harmonic vibration of the vibration mode deviates high for the abovementioned reason. Come.
Therefore, the sound pressure frequency characteristic has a small peak and dip, and the
characteristic is flat. Further, the high frequency limit frequency becomes high, and the
reproduction frequency range becomes wide.
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[0014]
(4)
As described above, since the diaphragm 1 of the present invention has airtightness and high
Young's modulus as the sheet material 2, it has bending resistance and wear resistance as the
diaphragm, and therefore, the vibration amplitude is large and large. It can withstand large
amplitude against electrical input and can mechanically maintain a long life.
In addition, when urethane resin is used at the edge of the diaphragm 1 such as a soft dome, high
noise is easily radiated, material durability is increased, deterioration is difficult, and reliability as
a speaker can be improved.
[0015]
(5)In addition, the diaphragm 1 of the present invention can maintain heat resistance, humidity
resistance, water resistance, chemical resistance, and gas resistance due to the physical
properties of the material and the processing thereof even under severe use conditions of the
speaker, so that the weather resistance is obtained. (Environmental resistance), shape retention
can be maintained even under severe environments, shape restoration and shape retention can
be ensured, and no qualitative change occurs as a diaphragm, so the qualitative life is extended. It
also has the effect that it can be maintained over a period of time.
[0016]
Embodiments of the present invention will be described below with reference to the drawings.
1 to 5 show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of a
voice coil mounted on an embodiment of the diaphragm of the present invention, and FIG. 2 is an
enlarged view of a fabric of the embodiment. 3 is a cross-sectional view of a speaker equipped
with the diaphragm of FIG. 1, FIG. 4 is a cross-sectional view of a heat mold for forming the
diaphragm, and FIG. It is sectional drawing which shows the aspect.
[0017]
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5
The dome-shaped diaphragm is usually formed in a dome shape, and a voice coil bobbin on
which a voice coil is wound is attached and mounted in the magnetic gap of the magnetic circuit.
, Acts as a speaker.
A speaker (FIG. 3) equipped with the dome-shaped diaphragm of FIG. 1 will be described.
[0018]
Thus, conventionally, a dome-shaped diaphragm is impregnated with a cloth such as cotton with
a phenol resin and dried, and then heated and solidified with a male and female heat mold to
press and press the center of the diaphragm. Mold the three parts of the dome part, the edge part
and the support part.
[0019]
Next, the upper end of the bobbin on which the voice coil is wound is adhered to the outer edge
of the dome, and the support is attached to the magnetic circuit or attached by screwing to
complete the assembly.
Then, as shown in FIG. 5, the baffle plate is provided with a mounting hole.
In the case of a cone-shaped diaphragm, paper pulp fibers are cut into a cone shape and formed,
and a voice coil bobbin is attached to the tip thereof, and it is shaped according to the structure
attached to the magnetic circuit as described above.
[0020]
The diaphragm 1 of the present invention is, as shown in FIG. 2, 40 denier / 20 of the polyester
fiber which has been subjected to super-stretching so that the elongation of the fiber of the
material constituting the diaphragm is about 50% of that of the polyester yarn. A fine fiber with a
small denier value of about a filament is punched in with a density of 110 yarns / in as warp 2a
and 92 yarns / in as weft 2b, respectively, to knit a plain-knitted ground portion Two to four 40
denier / 20 filament fibers are arranged as warps 3c of the lip stop portion for a fixed width of
5.5 lines / in for the book / in and the weft 2d of the lip stop portion, respectively. As a single
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fiber of 125 denier / 24 filament as a whole to make a plain weave of polyester fiber which has
been subjected to ultra-drawing at a degree of drawing of about 50% of the normal yarn as a
whole Material 2 is treated with a thin filler resin processing treatment with a basis weight of 20
g / m2 or less, and is brought into close contact with male and female molds 5a and 5b heated by
heating wires 6 and 6 as shown in FIG. The speaker diaphragm 1 is formed by processing three
parts of the central dome portion 1a, the edge portion 1b, and the support portion 1c of the
diaphragm 1 by heating and pressing.
[0021]
Then, next, after being separated from the molds 5a and 5b, the upper end portion of the voice
coil bobbin 3 on which the voice coil conductor 3a is wound is bonded to the outer edge portion
of the dome portion 1a as shown in FIGS. Thereafter, the support portion 1c is attached to the
magnetic circuit 4 so that the voice coil 3a is supported in the annular magnetic gap 4a of the
magnetic circuit 4, and is supported.
Then, as shown in FIG. 5, a mounting hole 8a is formed in the baffle plate 8 so that the dome
portion 1a is exposed to the outer surface.
[0022]
In this manner, when a voice input current is input to the voice coil 3a lead, the voice current
flowing through the voice coil 3a is induced with the magnetic flux in the magnetic gap 4a to
cause vibration according to the voice input to generate voice. .
[0023]
Although the embodiments considered to be representative of the present invention have been
described above, the present invention is not necessarily limited to only the structure of these
embodiments, and includes the above-described components according to the present invention,
and the present invention It is suitable for other electro-acoustic transducer parts, such as a
diaphragm of a cone type speaker, an edge material, or a dust cap, by appropriately modifying
within the range having the following effects. It can be implemented.
[0024]
As is apparent from the above description, the diaphragm 1 of the present invention is a thin
fiber of polyester which has been ultra-stretched so as to have an elongation of about 50% of that
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of the normal polyester yarn, together with the warp 2a. As the weft yarn 2b, they are densely
punched into a plain weave to form a ground portion, and fibers obtained by bundling fibers of
the same denier value in a certain width or single yarns of thick denier value fibers intermittently
and regularly Since the material woven by plain weave in a special weave method of arranging
and weaving as a lip stamp part is subjected to a thin sealing resin processing treatment of 20 g /
m 2 or less and molded by heat press processing, the following It came to have the remarkable
effect which can not be expected to such a conventional thing.
[0025]
(1)
In the diaphragm 1 of the present invention, the thickness of the material cloth material 2 is thin
and can maintain high density (see Table 1).
Accordingly, since the gaps between the fibers 2a and 2b and 2c and 2d are narrow and maintain
airtightness, air does not leak and there are few pinholes after molding, so that the material
fabric 2 does not expand.
[0026]
(2)By processing a thin resin with a small basis weight, the finish is light, and the reproduction
sound pressure is high as a highly efficient speaker, and the reproduction sound pressure is
improved by 2 to 3 dB as compared with the conventional example.
[0027]
(3)
The Young's modulus of the cloth of the diaphragm of the present invention can be maintained
as high as four times that of the other conventional example, and the propagation speed is also
approximately doubled (see Table 1).
Although the material thickness is small, the internal loss as the cross material is 1.4 times the
other, the tan δ is large, the Young's modulus as the sheet material is large, and a good balance
can be maintained as the diaphragm material.
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A speaker using such a diaphragm according to the present invention has a flat sound pressure
frequency characteristic with less peaks and dips, and hence less reproduction distortion, and a
higher high frequency limit frequency and a wide reproduction frequency range. Become.
[0028]
(4)The diaphragm according to the present invention has flexibility and wear resistance due to
the airtightness and high Young's modulus, so it has a large vibration amplitude, withstands a
large amplitude against a large electric input, and has a mechanically long life. I can keep it.
[0029]
(5)Since the diaphragm of the present invention has heat resistance, humidity resistance, water
resistance, chemical resistance, gas resistance, and weather resistance (environment resistance),
the shape retention is maintained even under severe environments. As a result, the shape
restoration property and the shape retention property can be ensured, and since there is no
qualitative change as a diaphragm, it has an effect of being able to maintain a qualitative long
life.
[0030]
The present invention has been described above with reference to the dome-shaped diaphragm
as an example of the material having the characteristics as described above, but a cone-shaped
diaphragm, dust cap, edge material, or It can also be applied as a component material for
electroacoustics such as headphone components.
[0031]
Brief description of the drawings
[0032]
1 is a cross-sectional view of a voice coil mounted on an embodiment of the diaphragm of the
present invention.
[0033]
2 is an enlarged exploded view of the fabric of the embodiment in FIG.
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[0034]
3 is a cross-sectional view of a speaker equipped with the diaphragm of FIG.
[0035]
4 is a cross-sectional view of a male and female heat mold for molding the diaphragm.
[0036]
5 is a cross-sectional view of the speaker attached with the diaphragm of the present invention
attached to the baffle plate.
[0037]
Explanation of sign
[0038]
Reference Signs List 1 diaphragm 1a dome portion 1b edge portion 1c support portion 2 fabric
2a longitudinal fiber 2b of the ground portion horizontal fiber 2c of the ground portion
longitudinal fiber 2d of the lip stop portion transverse fiber 2d of the lip portion 3 voice coil
bobbin 3a voice coil 4 magnetic circuit 4a Annular magnetic air gap 5a male die 5b female die 6
heating wire 8 baffle plate 8a mounting hole
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