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JP2011078094

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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 JP2011078094
The present invention relates to a diaphragm and a speaker using the same, and more
particularly to a diaphragm using a carbon nanotube and a speaker using the same. A diaphragm
according to a first embodiment of the present invention includes a plurality of carbon nanotube
linear structures, and the single carbon nanotube linear structure comprises a plurality of carbon
nanotubes. The diaphragm according to the second embodiment of the present invention
includes a plurality of composite carbon nanotube linear structures. The single composite carbon
nanotube linear structure includes a plurality of carbon nanotube linear structures and a
reinforcing layer. The single carbon nanotube linear structure comprises a plurality of carbon
nanotubes. The reinforcing layer is disposed to cover the surface of the carbon nanotube linear
structure. [Selected figure] Figure 1
Diaphragm and speaker using it
[0001]
The present invention relates to a diaphragm and a speaker using the same, and more
particularly to a diaphragm using a carbon nanotube and a speaker using the same.
[0002]
The speaker can convert an electrical signal to sound as an electroacoustic transducer.
According to the principle of operation, speakers are classified into various types such as
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dynamic speakers, magnetic speakers, electrostatic speakers, and piezoelectric speakers. The
various types of speakers all produce mechanical sound by means of mechanical vibration, that
is, they realize electro-mechanical force-sound conversion. Here, dynamic speakers are widely
used.
[0003]
In the conventional speaker, a diaphragm is directly connected to the voice coil, and the
diaphragm vibrates together to emit a sound having a waveform equal to that of the audio signal
into the air. The volume of the speaker is related to the power of the electrical signal input to the
speaker and the efficiency of converting the electrical signal into sound. However, if the power of
the electrical signal input to the speaker is too high, the diaphragm may be deformed or
damaged. Therefore, the toughness and Young's modulus of the diaphragm are related to the
rated output of the speaker. That is, the rated output of the speaker is the maximum power input
to the speaker to the extent that deformation or damage of the diaphragm does not occur. If the
weight per unit of the diaphragm is small, the energy for vibrating the diaphragm is small, the
energy conversion efficiency of the speaker is high, and the output volume of the speaker is
large.
[0004]
WO 2007/043837
[0005]
Kaili Jiang, Qunqing Li, Shoushan Fan, "Spinning continuous carbon nanotube yarns", Nature, Vol.
419, p.801
[0006]
However, the diaphragm of a conventional speaker is made of polymer, metal, ceramic or paper.
Since the toughness and Young's modulus of the diaphragm made of polymer or paper are very
low and the weight of the diaphragm made of metal or ceramic is large, the rated output of the
speaker using the diaphragm is low (eg 0.3 W There is a problem of ~ 0.5W).
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In addition, since the density of the conventional diaphragm is high, the energy conversion
efficiency of the speaker is low. Therefore, in order to increase the rated output and energy
conversion efficiency of the speaker, it is necessary to increase the Young's modulus and
toughness of the diaphragm and to reduce the density of the diaphragm.
[0007]
In Patent Document 1, a diaphragm is manufactured using a composite material formed by
dispersing carbon nanotubes in a film (stearic acid or fatty acid) with a surfactant. However,
since the specific surface area of carbon nanotubes is very large, carbon nanotubes tend to be
concentrated in the film. When the number of carbon nanotubes added to the film increases, it
becomes difficult to disperse the carbon nanotubes. In addition, since an additive such as a
surfactant is used, there is a problem that the vibration plate has many impurities. In addition, it
is difficult to install carbon nanotubes only at predetermined places of the diaphragm.
[0008]
The present invention provides a diaphragm having high toughness and Young's modulus and a
speaker using the same in order to solve the problems.
[0009]
The diaphragm according to the first embodiment of the present invention includes a plurality of
carbon nanotube linear structures.
The single carbon nanotube linear structure comprises a plurality of carbon nanotubes.
[0010]
The diaphragm according to the second embodiment of the present invention includes a plurality
of composite carbon nanotube linear structures. The single composite carbon nanotube linear
structure includes a plurality of carbon nanotube linear structures and a reinforcing layer. The
single carbon nanotube linear structure comprises a plurality of carbon nanotubes. The
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reinforcing layer is disposed to cover the surface of the carbon nanotube linear structure.
[0011]
The diaphragm according to the third embodiment of the present invention includes a plurality
of carbon nanotube linear structures and a plurality of reinforcing linear structures. The single
carbon nanotube linear structure comprises a plurality of carbon nanotubes. The plurality of
carbon nanotube linear structures are woven crossing the plurality of reinforcing linear
structures.
[0012]
The diaphragm according to the fourth embodiment of the present invention includes a plurality
of composite carbon nanotube linear structures and a plurality of reinforcing linear structures.
The plurality of composite carbon nanotube linear structures are woven crossing the plurality of
reinforcing linear structures. The single composite carbon nanotube linear structure includes a
plurality of carbon nanotube linear structures and a reinforcing layer. The single carbon
nanotube linear structure comprises a plurality of carbon nanotubes. The reinforcing layer is
disposed to cover the surface of the carbon nanotube linear structure.
[0013]
The diaphragm according to the fifth embodiment of the present invention includes a plurality of
carbon nanotube linear structures, a plurality of composite carbon nanotube linear structures,
and a plurality of reinforcing linear structures. The plurality of carbon nanotube linear
structures, the plurality of composite carbon nanotube linear structures, and the plurality of
reinforcing linear structures are crossed and woven. The single composite carbon nanotube
linear structure includes a plurality of carbon nanotube linear structures and a reinforcing layer.
The single carbon nanotube linear structure comprises a plurality of carbon nanotubes. The
reinforcing layer is disposed to cover the surface of the carbon nanotube linear structure.
[0014]
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The speaker according to the present invention comprises a magnetic unit having a magnetic
gap, a bobbin installed in the magnetic gap, a voice coil wound around the bobbin, and a
diaphragm fixed to one inner edge of the bobbin. There is. The diaphragm is the diaphragm of
any of the first to fifth embodiments.
[0015]
Compared with the prior art, the diaphragm of the present invention has the following
advantages. First, since carbon nanotubes have high toughness, Young's modulus and low
density, the toughness and Young's modulus of the diaphragm using carbon nanotubes are high.
Second, since the carbon nanotube linear structure used for the diaphragm of the present
invention is woven crosswise, the carbon nanotubes in the diaphragm are uniformly dispersed,
and no aggregation of carbon nanotubes occurs, and hence, The toughness and Young's modulus
of the diaphragm become high. Third, the carbon nanotube linear structure can be placed at any
position of the diaphragm.
[0016]
It is a schematic diagram of the diaphragm in Example 1 of this invention. It is a schematic
diagram of the non-twisted carbon nanotube linear structure of this invention. It is a schematic
diagram of the twisted carbon nanotube linear structure of this invention. It is a SEM photograph
of the non-twisted carbon nanotube wire of this invention. It is a SEM photograph of the twisted
carbon nanotube wire of the present invention. It is a schematic diagram of the diaphragm in
Example 2 of this invention. It is sectional drawing of the diaphragm in Example 2 of this
invention along line VII-VII of FIG. It is a schematic diagram of the diaphragm in Example 3 of
this invention. It is a schematic diagram of the diaphragm in Example 4 of this invention. It is a
schematic diagram of the diaphragm in Example 5 of this invention. It is a schematic diagram of
the speaker in Example 6 of this invention. It is sectional drawing of the speaker in Example 6 of
this invention.
[0017]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0018]
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Example 1 Referring to FIG. 1, the diaphragm 10 of the present example includes a plurality of
carbon nanotube linear structures 12.
The plurality of carbon nanotube linear structures 12 are woven in parallel or in parallel, or
cross-woven, or twisted to form a diaphragm 10 having a freestanding structure. Here, a selfsupporting structure is a form which can utilize the said diaphragm 10 independently, without
using a support body material. That is, it means that the diaphragm 10 can be suspended by
supporting the diaphragm 10 from opposite sides without changing the structure of the
diaphragm 10. In the present embodiment, the plurality of carbon nanotube linear structures 12
are crossed and woven to form a flat diaphragm 10. The diaphragm 10 is formed in a shape such
as a rectangle, an ellipse, a circle, or a triangle. The diaphragm 10 can be fixed to one support
(not shown) according to the conditions of actual application.
[0019]
Referring to FIGS. 2 and 3, the single carbon nanotube linear structure 12 includes at least one
carbon nanotube wire 121. As one example, referring to FIG. 2, the single carbon nanotube linear
structure 12 includes a plurality of the carbon nanotube wires 121. The plurality of carbon
nanotube wires 121 are arranged in parallel with the central axis of the carbon nanotube linear
structure 12 as an axis. As another example, referring to FIG. 3, the single carbon nanotube linear
structure 12 includes a plurality of the carbon nanotube wires 121. The plurality of carbon
nanotube wires 121 are arranged helically around the central axis of the carbon nanotube linear
structure 12.
[0020]
The method for producing the carbon nanotube wire utilizes a drawn carbon nanotube film
drawn from a super-aligned carbon nanotube array (see Non-Patent Document 1). In the drawn
carbon nanotube film, a plurality of carbon nanotubes are connected end to end along the same
direction. The single said drawn carbon nanotube film comprises a plurality of carbon nanotube
segments (not shown). The plurality of carbon nanotube segments are connected end-to-end with
intermolecular force along the length direction. Each carbon nanotube segment includes a
plurality of carbon nanotubes connected by intermolecular force in parallel to one another. The
lengths of the plurality of carbon nanotubes are the same in the single carbon nanotube segment.
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[0021]
There are the following three methods for forming the carbon nanotube wire. In the first type,
the drawn carbon nanotube film is cut at a predetermined width along the longitudinal direction
of the carbon nanotubes in the drawn carbon nanotube film to form a non-twisted carbon
nanotube wire. In the second type, the drawn carbon nanotube film may be immersed in an
organic solvent to shrink the drawn carbon nanotube film to form a non-twisted carbon nanotube
wire. In the third type, the drawn carbon nanotube film is machined (e.g., a spinning process) to
form a twisted carbon nanotube wire. Specifically, first, the carbon nanotube film is fixed to a
spinning device. Next, the spinning device is operated to rotate the carbon nanotube film to form
a twisted carbon nanotube wire.
[0022]
Referring to FIG. 4, the carbon nanotube wire comprises a plurality of carbon nanotubes
connected by intermolecular force. The plurality of carbon nanotubes are arranged parallel to the
central axis of the carbon nanotube wire. In this case, the diameter of one carbon nanotube wire
is 0.5 nm to 100 μm. Referring to FIG. 5, the carbon nanotube wire may be twisted to form a
twisted carbon nanotube wire. Here, the plurality of carbon nanotubes are arranged in a spiral
shape with the central axis of the carbon nanotube wire as an axis. In this case, the diameter of
one carbon nanotube wire is 0.5 nm to 100 μm. The carbon nanotube linear structure includes
at least one carbon nanotube wire. The heat capacity of one carbon nanotube wire is 0 (not 0
included) to 2 × 10 <-4> J / cm <2> · K, 5 × 10 <-5> J / cm <2> -It is preferable that it is K. The
carbon nanotube linear structure may be made of any one of the non-twisted carbon nanotube
wire, the twisted carbon nanotube wire, or a combination thereof.
[0023]
The vibration plate 10 includes at least one of the carbon nanotube linear structures 12, the
carbon nanotube linear structures 12 include at least one of the carbon nanotube wires 121, and
the carbon nanotube wires 121 include a plurality of carbon nanotubes. Contains nanotubes.
Since carbon nanotubes have high toughness and Young's modulus, the carbon nanotube wire
121 also has these characteristics, and as a result, the vibrating plate 10 also has similar
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characteristics.
[0024]
Example 2 Referring to FIG. 6, the diaphragm 20 of the present example includes a plurality of
composite carbon nanotube linear structures 22. The plurality of composite carbon nanotube
linear structures 22 are parallelly juxtaposed, cross woven, or twisted to form a diaphragm 20
having a freestanding structure.
[0025]
Referring to FIG. 7, the single composite carbon nanotube linear structure 22 includes the carbon
nanotube linear structure 12 and the reinforcing layer 24 of Example 1. The reinforcing layer 24
is disposed to cover the surface of the carbon nanotube linear structure 12. The reinforcing layer
24 may be made of metal, diamond, ceramic, paper, cellulose, polymer (for example,
polypropylene, polyethylene terephthalate (PET), polyetherimide (PEI), polyethylene naphthalate
(PEN), polyphenylene sulfide (PPS), poly It is made of any one of vinyl chloride (PVC),
polystyrene (PS) and polyethersulfone membrane (PES). Since the carbon nanotube linear
structure 12 has a plurality of holes, when the reinforcing layer 24 is formed by any one method
such as PVD, CVD, sputtering or vapor deposition, the carbon nanotube linear structure 12 may
be formed. The reinforcing layer 24 can be formed on the surface of each carbon nanotube. A
plurality of concentric reinforcing layers 24 can be formed on the surface of the carbon
nanotube linear structure 12 by applying the material to the surface of the carbon nanotube
linear structure 12 repeatedly by the above method. Thereby, the Young's modulus of the carbon
nanotube linear structure 22 including the carbon nanotube linear structure 12 and the
reinforcing layer 24 is increased. The thickness of the reinforcing layer 24 is 0.5 nm to 5000 nm.
[0026]
Furthermore, the diaphragm 20 includes a plurality of carbon nanotube linear structures 12 not
covered with the reinforcing layer 24. The plurality of carbon nanotube linear structures 12 are
woven crosswise with the plurality of composite carbon nanotube linear structures 22 and
formed into a flat plate-like structure.
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[0027]
Example 3 Referring to FIG. 8, the diaphragm 30 of the present example includes the plurality of
carbon nanotube linear structures 12 of the first example and the plurality of reinforced linear
structures 32. The plurality of carbon nanotube linear structures 12 are arranged in parallel, and
the plurality of reinforcing linear structures 32 are arranged in parallel. The plurality of carbon
nanotube linear structures 12 are crossed and woven perpendicularly to the plurality of
reinforcing linear structures 32. Since the plurality of carbon nanotube linear structures 12 and
the plurality of reinforcing linear structures 32 are closely crossed and woven, the plurality of
carbon nanotube linear structures 12 and the plurality of reinforcing linear structures There are
few gaps formed between the bodies 32.
[0028]
The reinforcing linear structure 32 is a cotton wire, a fiber, a polymer wire or a metal wire. In the
present embodiment, the reinforcing linear structure 32 is a cotton line. Therefore, the Young's
modulus of the diaphragm 30 is high, and the cost is low.
[0029]
Example 4 Referring to FIG. 9, the diaphragm 40 of the present example includes the composite
carbon nanotube linear structures 22 of the plurality of examples 2 and the reinforced linear
structures 32 of the plurality of examples 3. The plurality of composite carbon nanotube linear
structures 22 are arranged in parallel, and the plurality of reinforcing linear structures 32 are
arranged in parallel. The plurality of composite carbon nanotube linear structures 22 are crossed
and woven perpendicularly to the plurality of reinforcing linear structures 32. Since the plurality
of composite carbon nanotube linear structures 22 and the plurality of reinforcing linear
structures 32 are closely crossed and woven, the plurality of composite carbon nanotube linear
structures 22 and the plurality of reinforcing lines There are few gaps formed between the rodshaped structures 32.
[0030]
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Example 5 Referring to FIG. 10, the diaphragm 50 of this example includes the plurality of
carbon nanotube linear structures 12 of the first example, and the plurality of composite carbon
nanotube linear structures 22 of the second example. And a plurality of reinforcing linear
structures 32 of the third embodiment. The plurality of carbon nanotube linear structures 12, the
plurality of composite carbon nanotube linear structures 22, and the plurality of reinforcing
linear structures 32 are crossed and woven. The plurality of carbon nanotube linear structures
12 are arranged in parallel, the plurality of composite carbon nanotube linear structures 22 are
arranged in parallel, and the plurality of reinforcing linear structures 32 are arranged in parallel
ing. The plurality of carbon nanotube linear structures 12 and the plurality of composite carbon
nanotube linear structures 22 are arranged in parallel and perpendicular to the reinforced linear
structure 32.
[0031]
Example 6 Referring to FIGS. 11 and 12, the speaker 400 using the diaphragm of Examples 1 to
4 includes a frame 402, a magnetic unit 404, a voice coil 406, a bobbin 408, and a diaphragm.
410 and a damper 412. The frame 402 is fixed to one side of the magnetic unit 404. The voice
coil 406 is wound around the bobbin 408 and accommodated in the magnetic unit 404. One
outer edge of the vibrating plate 410 is fixed to one inner edge of the frame 402, and one inner
edge of the vibrating plate 410 is fixed to one outer edge of the bobbin 408. The diaphragm 410
is fitted into the magnetic gap 424 of the magnetic unit 404.
[0032]
The magnetic unit 404 includes a first flat plate 416 to which a central column 422 is fixed, a
second flat plate 418, and a magnet 420. The magnet 420 is sandwiched between the first flat
plate 416 and the second flat plate 418. The second flat plate 418 and the magnet 420 have an
annular shape. The central column 422 is inserted at the center of the second flat plate 418 and
the magnet 420.
[0033]
The frame 402 is a frustum in which an opening is formed at one end, and has a hollow and a
bottom 414. The diaphragm 410 and the damper 412 are incorporated in the hollow hole 415.
The bottom portion 414 has a central hole 413. The central column 422 is inserted into the
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central hole 413 of the bottom portion 414. The bottom 414 of the frame 402 is fixed to the
magnetic unit 404.
[0034]
The voice coil 406 is wound around the bobbin 408 as an element for driving the speaker 400.
When an electrical signal is input to the voice coil 406, the voice coil 406 can generate a
magnetic field. The interaction between the magnetic field generated by the voice coil 406 and
the magnetic unit 404 causes the voice coil 406 to vibrate.
[0035]
The bobbin 408 is a light hollow structure. The center post 422 is disposed in the hollow portion
of the bobbin 408 so as to be separated from the bobbin 408 by a predetermined distance. When
the voice coil 406 vibrates, the bobbin 408 and the diaphragm 410 are simultaneously vibrated
to generate sound.
[0036]
The diaphragm 410 is installed as a voice element of the speaker 400. When applied to a largesized speaker 400, the diaphragm 410 is formed in a cone shape. When applied to the smallsized speaker 400, the diaphragm 410 is formed in a flat plate-like circle or rectangle.
[0037]
The damper 412 is annular and mechanically locked to the diaphragm. The damper 412 is fixed
to the frame 402 and the bobbin 408.
[0038]
Further, an input terminal is externally connected to the frame 402. In addition, a cover (not
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shown) can be installed to cover the joint portion of the diaphragm and the bobbin 408.
[0039]
Reference Signs List 10 diaphragm 12 carbon nanotube linear structure 121 carbon nanotube
wire 20 diaphragm 22 composite carbon nanotube linear structure 24 reinforced layer 30
diaphragm 32 reinforced linear structure 40 diaphragm 400 speaker 402 frame 404 magnetic
unit 406 voice coil 408 bobbin 410 diaphragm 412 damper 416 first plate 418 second plate
420 magnet 422 center column 424 magnetic gap 50 diaphragm
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