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JP2017519376

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DESCRIPTION JP2017519376
Abstract: The present invention provides a thin film (2) for producing a vibrating membrane (5),
a method of producing a vibrating membrane (5), and a composite vibrating membrane. The thin
film (2) is formed of MCPET material, and the MCPET material is an MCPET reflector (1) having
mutually independent micropores (201) having an average pore diameter of 5 μm or less, and
the MCPET reflector (1) has a foaming ratio of 2 The density is less than 300 kg / m. The
reflective plate (1) is further processed by layer cutting to form a thin film (2) which is thinner
than the treated MCPET reflective plate (1) and exposes the fine holes on at least one surface to
become the fine hole exposed surface. Then, the thin film (2) is thermoformed at 130 ° C. to
140 ° C. to form a vibrating film (5). The composite vibration film includes a main vibration film
(5) and an auxiliary vibration film (6), and the main vibration film (5) is formed of the thin film
(2). As compared with the prior art, the vibrating membrane (5) formed of the thin film (2) has
excellent acoustic performance. [Selected figure] Figure 2
Thin film for manufacturing diaphragm, method of manufacturing diaphragm and composite
diaphragm
[0001]
The present invention relates to an electroacoustic apparatus and an acoustic product
manufacturing field, and further, a thin film (membrane) for producing a speaker vibrating film, a
method of manufacturing a vibrating film using the thin film, and the thin film and the vibrating
film The present invention relates to a speaker diaphragm manufactured by MCPET (hereinafter,
MCPET (registered trademark): Microcellular formed Polyethylene Terephthalate) material.
[0002]
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1
With regard to the speaker, the diaphragm is the main component, and the performance of the
diaphragm significantly affects the speaker performance.
In the prior art, materials for producing a speaker diaphragm include paper-like materials,
polypropylene materials, metal materials and the like, but conventional speakers made of these
materials have problems in sound reproduction. For example, a vibrating film made of a paper
material is greatly affected by humidity and temperature at the time of use, also has poor
durability and moisture resistance, and moisture is easily absorbed by the paper vibrating film, so
the vibrating film quality when used for a long time Can accelerate the development of this
deterioration, especially under humid weather conditions. In addition, since the paper quality
vibration film has poor heat resistance, it may be deformed as time passes under a high
temperature environment. Therefore, corn paper is sensitive to temperature and humidity, and in
addition to the influence of the change in the use environment on the sound, if a large number of
such changes occur, it may also cause irreparable deformation of the corn paper. Therefore,
many speakers manufactured by using a paper diaphragm may deteriorate in performance after
being used for a certain period of time. In addition, although the vibrating film made of a
polypropylene material has a lower density than a paper-based vibrating film, its heat resistance
is poor. Furthermore, since the vibrating membrane made of metal material is strong in rigidity
and low in resistance, and the vibrating membrane itself does not absorb energy, when a crack in
the cone paper occurs, a clear formant can be seen on the side of high frequency response. If you
do not handle it properly, you will be more likely to hear "metal sounds". That is, harmonic
distortion may be formed in the audio reproduction process.
[0003]
In order to overcome these problems, in the prior art, an alternative solution is to manufacture a
speaker diaphragm using a micro-porous polyethylene terephthalate (PET) sheet (hereinafter
referred to as PET sheet) having an average size of 10 μm to 30 μm. The law is proposed. The
diaphragm material manufactured in this way is more lightweight as the elasticity level is
improved, the durability of the speaker diaphragm can be secured, and distortion in audio
reproduction is also small. However, the speaker diaphragm manufactured by the PET sheet has
two problems. That is, first, since it is necessary to ensure sufficient foaming during manufacture,
the foamed PET sheet has an ultimate value of its thickness of 0.85 mm and is used as a vibrating
membrane of a small-diameter speaker as described above. Thickness is too thick. Second, the
pore size of the micropores is too large, which affects the optimal balance between density level
and stiffness level. Therefore, the foamed PET sheet in the prior art has not been recognized as
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2
the best material for producing a speaker vibrating film in the industry, and has long sought an
essentially new vibrating film material for a long time. So far, there are still many researchers and
research institutes doing research and development of vibrating membrane materials, but it has
been clearly understood that the above-mentioned problems require improvement of the prior
art.
[0004]
An object of the present invention is to provide a thin film for producing a vibrating membrane, a
method for producing a vibrating membrane, and a composite vibrating membrane, in order to
provide a novel thin film material for producing a speaker vibrating membrane, and such a thin
film material It is an object of the present invention to provide a method of forming a vibrating
membrane and a speaker vibrating membrane excellent in overall performance manufactured by
such a thin film material.
[0005]
A thin film for producing a vibrating membrane according to the present invention is formed of
an MCPET (registered trademark) material, and the MCPET material is an MCPET reflective plate
having mutually independent micropores having an average pore diameter of 5 μm or less.
The MCPET reflective plate has a foaming ratio of 2 or less and a density of 300 kg / m 3 or less,
and the MCPET reflective plate is thinner than the MCPET reflective plate to be processed by
layered cut. A process for forming a thin film is further performed, and the thin film is a thin film
for producing a vibrating film characterized in that the fine holes are exposed on at least one
surface to be the fine holes exposed surface.
[0006]
Preferably, the thickness of the thin film is 0.05 mm to 1 mm, more preferably 0.05 mm to 0.4
mm.
[0007]
Further, the method for producing a speaker diaphragm according to the present invention has
MCPET reflection which has mutually independent micropores having an average pore diameter
of 5 μm or less, an expansion ratio of 2 or less, and a density of 300 kg / m 3 or less. The thin
film is thinner than the MCPET reflective plate to be cut and has a thickness of 0.05 mm to 1 mm
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by layer cutting, and the thin film is formed so that the fine holes are exposed on at least one side
and the fine holes are exposed. C. to 140.degree. C. to form a vibrating film.
[0008]
Preferably, during heat forming, the entire thin film is heat-formed so as to form a flat or domeshaped vibrating film structure having a plurality of conical, concave emitting surfaces
throughout the thin film, and Each vibrating membrane structure is cut out from the whole thin
film by punching or cutting.
[0009]
In addition, preferably, the heat molding is performed on one side or both sides, and in the case
where the exposed surface of the micropores is only one side, heat molding on one side or heat
formation on both sides with a mold is preferable. The contact surface is a micropore nonexposed surface.
[0010]
A loudspeaker composite diaphragm according to the present invention includes a main
diaphragm and an auxiliary diaphragm, wherein the main diaphragm is formed of a thin film
material, and the thin film material is an independent micropore having an average pore
diameter of 5 μm or less. The MCPET reflector has an expansion ratio of 2 or less and a density
of 300 kg / m 3 or less, and the main vibration film has a thickness of the MCPET reflector by
layer cutting. A thin film that exposes the micropores on at least one side to be a micropore
exposed surface, and is further formed by thermoforming the above-mentioned thin film at 130
° C. to 140 ° C. The auxiliary vibrating membrane has a circular or annular shape, and the
outer diameter is larger than the outer diameter of the main vibrating membrane, and the main
vibrating membrane is superimposed on the auxiliary vibrating membrane and located at the
center position of the auxiliary vibrating membrane It is characterized by That.
[0011]
Preferably, when the thin film has only one exposed micropore surface, the direction of the
exposed micropore surface is opposite to the sound transmission direction of the main vibrating
membrane.
[0012]
Preferably, the main vibrating membrane is a conical vibrating membrane, a flat vibrating
membrane having a concave radiation surface, or a dome shaped vibrating membrane.
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[0013]
Preferably, the main vibrating membrane has an annular connection edge, is superimposed on
the auxiliary vibrating membrane through the annular connecting edge, and is integrated with
the auxiliary vibrating membrane by adhesion or heat bonding to form a composite vibrating
membrane. Do.
[0014]
More preferably, the auxiliary vibrating membrane is formed of a paper-like material or a
polymer material, and a rigid ring is fixed to the outer peripheral edge.
[0015]
The thin film for producing a vibrating membrane according to the present invention is formed
of an MCPET material, and more specifically, has mutually independent micropores having an
average pore diameter of 5 μm or less, a foaming ratio of 2 times or less, and a density of 300
kg / kg. It is formed of an MCPET reflector having m <3> or less.
Here, the MCPET reflector is a reflector researched and developed by Furukawa Electric Co., Ltd.
in order to improve the illumination brightness, and is also called an ultrafine foam light
reflector.
The ultrafine foamed light reflecting plate is a reflective plate having a very good reflective effect
manufactured by ultrafine foaming technology using polyethylene terephthalate (PET:
polyethyleneterephthalate) as a base material, and MCPET (Microcellularformed Polyethylene) by
Furukawa Electric Co., Ltd. It was named Terephthalate.
The micropores in the MCPET reflector are called ultra-fine foamed light reflectors because the
average pore size is usually limited to 10 μm or less at the time of manufacture and much
smaller than general foamed polymer reflectors.
Among them, the MCPET-VA series reflectors are required to have mutually independent
micropores having an average pore diameter of 5 μm or less according to the present invention,
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an expansion ratio of 2 times or less, and a density of 300 kg / m 3 or less. Meet.
Such MCPET reflectors require a certain thickness in order to ensure sufficient foaming, and it is
difficult to ensure uniform and sufficient foaming if the thickness is too thin.
At present, the MCPET reflector manufactured by Furukawa Electric Co., Ltd. has a minimum
thickness of 0.51 mm and a foaming ratio of generally 1.5 to 2 times.
As described above, MCPET is known to achieve the following advantages when the expansion
ratio suitable for the present invention is limited to 2 times or less.
That is, MCPET performs ultrafine foaming by physical means of expanding a gas under high
temperature and high pressure without adding a foaming agent at the time of production to
obtain mutually independent micropores, so that harmful substances are not used. By recycling
the PET, the waste can be processed and high surface smoothness can be obtained.
In addition, such a material has excellent light reflection properties such as a total reflectance of
99% or more, a diffuse reflectance of 96%, and a regular reflectance of 3%, and is lightweight,
shock resistant, and high temperature resistant. Excellent shape retention is possible even when
no external force is exerted at 160 ° C., and in secondary processing, molding can be performed
by methods such as cutting, punching, bending and heating. The flame retardancy of the MCPET
material meets the flame retardant criteria of foam material UL94-HBF or higher. Also, these
properties of the MCPET material allow the reflection capabilities of the light sources of each
wavelength to be maintained uniformly.
[0016]
The thin film for producing a vibrating membrane according to the present invention has the
following differences as compared with vibrating membranes of polymer materials in the prior
art. That is, firstly, the average pore diameter by ultrafine foaming is 5 μm or less, secondly, the
foaming ratio is limited to 2 times or less, thirdly, the micropores are independent of each other,
fourthly, The thin film for producing a vibrating membrane according to the present invention is
obtained by further processing a relatively thick MCPET reflector, so that at least one exposed
micropore surface is formed, and a micropore structure is formed on at least one surface. Since
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the vibrating film of the polymer material in the prior art uses a foaming agent at the time of
foaming as opposed to being formed, the formed fine pores have a large pore diameter of 10 μm
or more, while the fine pores penetrate each other. May affect the transmission of voice. On the
other hand, since the polymer vibrating membrane in the prior art is manufactured by roll
rolling, such a polymer vibrating membrane forms a large amount of micropores in the base
material, but in manufacturing processes such as contact with rolls at the time of manufacture
Due to the limitation, a dense membrane layer is formed on the upper and lower surfaces of the
membrane, and the number of exposed micropores is negligible.
[0017]
The thin film for producing a vibrating membrane according to the present invention has high
structural strength and elasticity even when the density is significantly reduced by having
mutually independent fine pore structures with small pore diameters. Moreover, the open micro
structure cut out by cutting improves the intermolecular force and viscosity of the MCPET thin
film during cutting and further hardens the MCPET thin film, so that the stick phenomenon of the
vibrating film becomes apparent by this hardening action. To be improved.
[0018]
Furthermore, the open pore structure inherently increases the vibrational area, thus giving the
vibrating membrane made of the thin film according to the invention a higher sensitivity and a
better ability to generate sound pressure by vibration.
[0019]
According to the above description, an MCPET reflector having an average pore diameter of 5
μm or less and an expansion ratio of 2 times or less is selected from various MCPET reflector
products, and is thinner than the MCPET reflector to be treated by cutting, and After forming the
thin film that exposes the micropores on at least one side to become the micropore exposed
surface, the vibrating membrane manufactured by the method according to the present invention
can easily understand the reason for having very excellent acoustic performance.
[0020]
As a result, the diaphragm according to the present invention has an extremely excellent sound
reproduction capability in the sound frequency range of 20 Hz to 5500 Hz, a small sound
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pressure loss without sudden change, and a reproduction sound pressure of 112 db or more. The
low resolution allows to guarantee high quality playback music and provide an excellent hearing
experience.
In addition, while a speaker using a diaphragm made of a thin film according to the present
invention has a sensitivity of 116 db, the same type of loudspeaker in the prior art generally has
a sensitivity in the range of 105 db to 110 db.
In addition, it is clear that the power consumption required for the highly sensitive speaker
diaphragm is small, and the sound reproduction capability of the diaphragm is also higher.
[0021]
The present inventors manufactured a moving coil speaker by using a vibrating membrane
manufactured by the method for manufacturing a vibrating membrane of the present invention
using the thin film of the present invention. Furthermore, as a result of comparing the overall
performance of the obtained moving coil speaker with moving coil speakers made of vibrating
films of similar moving coil parts and other materials, the thin film of the present invention and
the method of manufacturing the vibrating film of the present invention It is shown that the
vibrating membrane produced by the above has better overall performance.
[0022]
Specific performance will be further described together with an example in the mode for carrying
out the invention. In summary, the performance of the vibrating membrane of the present
invention is significantly improved compared to the same type of vibrating membrane in the
prior art.
[0023]
FIG. 1 is a schematic view of cutting of an MCPET reflector in the process of producing a thin
film for producing a vibrating film according to a preferred embodiment 1 of the present
invention. FIG. 2 is an enlarged view of a microscopic exposed surface of a thin film for
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producing a vibrating diaphragm according to a preferred embodiment 1 of the present
invention. FIG. 3 is a schematic view of the configuration of a vibrating film formed by
thermoforming the entire thin film in the method of manufacturing a speaker vibrating film
according to a preferred embodiment 2 of the present invention. FIG. 4 is a schematic view of a
dome-shaped diaphragm manufactured by the method for manufacturing a speaker diaphragm
according to a preferred embodiment 2 of the present invention using the thin film according to
the preferred embodiment 1 of the present invention. FIG. 5 is a schematic structural view of a
composite diaphragm including a dome-shaped diaphragm manufactured by the method of
manufacturing a speaker diaphragm according to a preferred embodiment 2 of the present
invention using the thin film according to the preferred embodiment 1 of the present invention.
FIG. FIG. 6 is a frequency response curve of the speaker using the thin film according to the
present invention.
[0024]
The invention will now be further described with reference to the preferred embodiments of the
invention and the figures.
[0025]
EXAMPLE 1 This example provides a thin film for vibrating film production which is formed of
MCPET material.
The MCPET material is an MCPET reflector 1. The MCPET reflection plate 1 has mutually
independent micropores 201 having an average pore diameter of 5 μm or less, an expansion
ratio of 2 times or less, and a density of 300 kg / m 3 or less. Specifically, an MCPET-VA reflector
was used in this example. As shown in FIG. 1, in the present embodiment, the MCPET reflector 1
is subjected to layered cutting with a cutter 3 to form a thin film 2 thinner than the treated
MCPET reflector 1 and having a thickness of 0.05 mm to 1 mm. It formed. The thin film 2 formed
by the layered cutting exposes the micropores 201 on at least one side, and becomes a
micropore exposed surface. As a matter of course, after layered cutting of the uppermost layer of
the original MCPET reflection plate 1, when layered cutting is subsequently performed, the newly
formed thin film 2 exposes the micropores 201 on both sides. In this case, the thin film 2 has two
micropore exposed surfaces. Even when the micropore exposed surface of the thin film 2 is one
surface, good performance can be guaranteed, so that it is advantageous to improve the
performance of the relatively thick thin film 2 when both surfaces are micropore exposed
surfaces. In the present invention, the thin film 2 preferably has a thickness of 0.05 mm to 0.4
mm. A commercially available PET plate splitting machine may be used as an apparatus for
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layered cutting. The frequency response characteristic test was performed on the thin film in the
present example in accordance with the internal standard QZ / LCT-QP140-2007 of Longcheer
Holdings. The vibrating membrane of the speaker to be tested is formed of the thin film 2 in this
example, the material is a MCPET-VA reflector, the thickness is 0.08 mm, the average pore
diameter of the micropores 201 is 5 μm or less, and the foaming ratio is 1 .8 The density is 235
kg / m <3>. The resulting frequency response curve is shown in FIG.
[0026]
EXAMPLE 2 A method of manufacturing a speaker diaphragm according to this example is
shown in FIGS. First, the MCPET reflective plate 1 which has mutually independent 201 having
an average pore diameter of 5 μm or less, an expansion ratio of 2 or less, and a density of 300
kg / m <3> or less is layered cut with a cutter 3 A thin film 2 thinner than the cut MCPET
reflector 1 was formed. Here, the same layered cutting device as in Example 1 was used.
Specifically, in this example, an MCPET-VA reflector was used. In the present embodiment, since
the thickness of the thin film 2 is 0.05 mm to 1 mm, the thin film 2 thus formed exposes the
micropores 201 on at least one surface and becomes a micropore exposed surface. Thereafter,
the thin film 2 was heat-formed at 130 ° C. to 140 ° C. to form a vibrating film. In the present
embodiment, as shown in FIG. 3, the entire thin film 2 is heat-formed to form a plurality of domeshaped vibrating film structures 4 in the entire thin film 2. Subsequently, each vibrating
membrane structure 4 was cut out from the whole thin film 2 by punching or cutting, and as
shown in FIG. 4, individual vibrating membranes 5 were formed. In addition, when a micropore
exposed surface is only one surface, the contact surface with a mold is a micropore non-exposed
surface whether it is heat molding on one side or heat molding on both sides.
[0027]
EXAMPLE 3 In the description of this example, the vibrating film 5 is also called the main
vibrating film 5. As shown in FIG. 5, this embodiment provides a loudspeaker composite
diaphragm including the main diaphragm 5 and the auxiliary diaphragm 6. The main vibration
film 5 was formed of a thin film material which is a MCPET reflective plate material. The MCPET
reflective plate material has mutually independent micropores having an average pore diameter
of 5 μm or less, an expansion ratio of 2 times or less, and a density of 300 kg / m 3 or less. The
MCPET reflective plate formed the thin film 2 by layered cutting. The thin film 2 has a thickness
of 0.05 mm to 1 mm, and the fine holes 201 are exposed on at least one side to become the fine
hole exposed surface. The thin film 2 was heat-formed at 130 ° C. to 140 ° C. to form the main
vibration film 5. In addition, the auxiliary vibrating membrane 6 is circular or annular, and the
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outer diameter of the auxiliary vibrating membrane 6 is larger than the outer diameter of the
main vibrating membrane 5. The main vibrating membrane 5 is superimposed on the auxiliary
vibrating membrane 6 and positioned at the center position of the auxiliary vibrating membrane
6. In particular, when the thin film 2 has only one exposed micropore surface, the direction of the
exposed micropore surface is opposite to the sound transmission direction of the main
diaphragm 5. In the present embodiment, the main vibrating membrane 5 is a dome-shaped
vibrating membrane and has an annular connecting edge 501, and is superimposed on the
auxiliary vibrating membrane 6 via the annular connecting edge 501, by adhesion or thermal
bonding. It is integrated with the auxiliary vibrating membrane 5 to form a composite vibrating
membrane. In the present embodiment, the auxiliary vibrating membrane 6 is formed of a paperlike material or a polymer material. Further, a rigid ring 7 is fixed to the outer peripheral edge of
the auxiliary vibrating membrane 6.
[0028]
A comparison of the overall performance of a loudspeaker manufactured with the dome shaped
diaphragm provided in the preferred embodiment 2 and a loudspeaker manufactured with the
same type of diaphragm in the prior art is shown in Table 1.
[0029]
[0030]
It can be seen from Table 1 that the vibrating membrane made of the thin film of the present
invention has strength far superior to that of polypropylene and paper vibrating membrane
despite having a fine pore structure.
Furthermore, the vibrating membrane of the present invention can achieve high strength at a
lower density than vibrating membranes in the prior art.
According to the data in Table 1, the density of the vibrating membrane in the present invention
is clearly lower than that of other materials. In the extreme case, the density of the vibrating
membrane in the present invention is only 15% of the PET material vibrating membrane in the
prior art, 18% of the polypropylene material vibrating membrane, and 28% of the paper quality
vibrating membrane. That is, it is clear that the vibrating membrane of the present invention has
more excellent lightness, low density and strength as compared with vibrating membranes of
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other materials, and thus more meets the requirements for the vibrating membrane of the
speaker.
[0031]
With respect to the sound transmission speed (sound velocity), the vibrating membrane of the
present invention is 8.3% faster than the vibrating membrane of PET material in the prior art,
11.4% faster than the polypropylene vibrating membrane, and 21.8% faster than the paper
vibrating membrane . According to such high sound velocity, it can be proved that the vibration
film of the present invention improves the sound velocity by improving the vibrating film stick
phenomenon inherent to the polymer vibration film, and further improves the sound reproducing
capability.
[0032]
With regard to energy loss (Tan δ), the vibrating membrane of the present invention is 13%
lower than the vibrating membrane of PET material in the prior art and 38% lower than the
vibrating membrane of polypropylene material, and is the vibrating membrane of paper quality
material Since it is a little higher, it can be said that it has a good energy loss. This property
reduces distortion and noise in the sound reproduction of the diaphragm, as the relatively low
energy loss facilitates recovery after the diaphragm has vibrated.
[0033]
For the sound pressure, the sound pressure by the vibrating membrane of the present invention
in the frequency band of 20 Hz to 5500 Hz is in the range of 101 db to 125 db. This result is
3.7% higher than the vibrating film of PET material in the prior art, 7.6% higher than the
vibrating film of polypropylene material, and 14.2% higher than the paper quality vibrating film.
From this, it is shown that the diaphragm of the present invention can obtain higher voice output
at the same input power and has excellent voice reproduction efficiency.
[0034]
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With respect to the moisture resistance and the ultraviolet light prevention effect, the vibrating
membrane of the present invention is clearly superior to polypropylene and paper vibrating
membranes. This property indicates that the vibrating membrane of the present invention is
durable and stable.
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