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JP2011013666

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2011013666
The present invention relates to an acoustic projection screen and an image projection system
using the same. An acoustic projection screen of the present invention includes a curtain cloth, a
carbon nanotube structure, and at least two electrodes. The carbon nanotube structure is
attached to one surface of the curtain cloth. The image projection system of the present invention
comprises the above-mentioned acoustic projection screen and a projector. The projector
projects an image ray onto the acoustic projection screen. [Selected figure] Figure 1
Acoustic projection screen and image projection system using the same
[0001]
The present invention relates to an acoustic projection screen and an image projection system
using the same.
[0002]
Conventionally, an image projection system includes a reflective projection screen and an image
projector.
The light diffusing surface of the reflective projection is arranged to face the audience. The image
projected from the image projector to the reflective projection screen is diffused at the light
diffusing surface and visible to the eye of the audience. The image projection system further
includes a speaker. The speaker is placed after the reflective screen and transfers sound to the
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audience's ear.
[0003]
Kaili Jiang, Qunqing Li, Shoushan Fan, "Spinning continuous carbon nanotube yarns", Nature, Vol.
419, p.801
[0004]
However, the reflection projection screen itself can not generate sound.
In addition, since the conventional speaker generates sound by the action of the electromagnetic
field by the magnet, the weight of the image projection system using the speaker is heavy, and
the volume is large. In addition, the installation of the projection screen and the speaker in the
conventional image projection system has the effects of light diffusion and sound generation, so
that the structure is complicated and the cost is high.
[0005]
The acoustic projection screen of the present invention includes a curtain cloth, a carbon
nanotube structure, and at least two electrodes. The carbon nanotube structure is attached to one
surface of the curtain cloth.
[0006]
The carbon nanotube structure includes at least one carbon nanotube film. The single carbon
nanotube film comprises only a plurality of carbon nanotubes.
[0007]
The image projection system of the present invention comprises an acoustic projection screen
including a curtain cloth, a carbon nanotube structure, and at least two electrodes, and a
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projector. The projector projects an image ray onto the acoustic projection screen.
[0008]
As compared with the prior art, the acoustic projection screen of the present invention can
generate the sound and the image synchronously with the acoustic projection screen by
generating the sound using the carbon nanotube structure. Eliminate the need for traditional
speakers. The carbon nanotube structure used in the present invention is lighter and thinner
than a magnet used as a conventional speaker. Therefore, the acoustic projection screen using
the carbon nanotube structure can be miniaturized. Further, since the carbon nanotube structure
has excellent flexibility, an acoustic projection screen using the carbon nanotube structure can be
wound, organized, and transported conveniently.
[0009]
It is a schematic diagram of the acoustic projection screen of this invention. FIG. 2 is a crosssectional view of the acoustic projection screen of the present invention taken along line II-II. It is
a SEM photograph of the carbon nanotube film of the present invention. It is a schematic
diagram of the carbon nanotube segment of this invention. FIG. 5 illustrates drawing a carbon
nanotube film from a super aligned carbon nanotube array in the present invention. It is a
schematic diagram of the acoustic projection screen of this invention. It is a schematic diagram of
the acoustic projection screen of this invention. It is a schematic diagram of the acoustic
projection screen of this invention. FIG. 1 is a schematic view of an image projection system of
the present invention.
[0010]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0011]
1 and 2, the acoustic projection screen 130 of the present invention includes the screen cloth
131, the carbon nanotube structure 133, the first electrode 134 and the second electrode 135, It
is installed on one surface of the curtain cloth 131.
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The first electrode 134 and the second electrode 135 are electrically connected to the carbon
nanotube structure 133, respectively.
[0012]
The curtain cloth 131 has a first surface 137 and a second surface 138 facing the first surface
137. The first surface 137 is used as a viewing surface. The carbon nanotube structure 133 is
disposed on the first surface 137 and / or the second surface 138 of the curtain cloth 131. The
surface of the carbon nanotube structure 133 opposite to the surface contacting the first surface
137 or the second surface 138 of the curtain cloth 131 is in contact with the surrounding air.
The curtain cloth 131 is a curtain cloth used in a conventional image projection system. Further,
the curtain cloth 131 includes a substrate 136 and a light diffusion layer 139 disposed on one
surface of the substrate 136. The curtain cloth 131 is a rear projection screen or a reflection
projection screen. In the present embodiment, the curtain cloth 131 is a reflective projection
curtain. The substrate 136 is made of a white opaque material such as polyvinyl chloride (PVC),
polypropylene (PP) or polyethylene (PE). Furthermore, the substrate 136 can be a woven or
white wall. The light diffusion layer 139 may be obtained by applying a material having light
diffusion performance to the substrate 136. Referring to FIG. 7, in the present embodiment, the
carbon nanotube structure 133 is disposed on the second surface 138 of the curtain cloth 131.
[0013]
Furthermore, a reflective layer 132 can be installed on the substrate 131. The reflective layer
132 is disposed between the substrate 136 and the light diffusion layer 139. The light diffusion
layer 139 may be coated on the reflective layer 132. The reflection layer 132 can reduce light
reflection of the substrate 131. The reflective layer 132 is made of ZnO, SiC, glass or BaSO 4. The
light reflectance of the reflective layer 132 is 5% to 70%. Accordingly, the light reflectance of the
acoustic projection screen 130 is 5% to 50%. As shown in FIG. 7, when the carbon nanotube
structure 133 is installed on the second surface 138 of the curtain cloth 131, the light
reflectance of the reflective layer 132 may reach 5% to 50%.
[0014]
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The reflective layer 132 and the light diffusion layer 139 may not be provided. In this case, the
carbon nanotube structure 133 may be directly attached to one surface of the substrate 136.
[0015]
The heat capacity per unit area of the carbon nanotube structure 133 is 0 (not including 0) to 2
× 10 <-4> J / cm <2> · K, but preferably 0 (not including 0). ) To 1.7 × 10 <-6> J / cm <2> · K,
and in the present embodiment, it is 1.7 × 10 <-6> J / cm <2> · K. A plurality of carbon
nanotubes are uniformly dispersed in the carbon nanotube structure. The plurality of carbon
nanotubes are connected by intermolecular force. The plurality of carbon nanotubes are aligned
or aligned in the carbon nanotube structure. The carbon nanotube structures are classified into
two types of non-oriented carbon nanotube structures and oriented carbon nanotube structures
according to the arrangement of the plurality of carbon nanotubes. In the non-oriented carbon
nanotube structure in this embodiment, the carbon nanotubes are arranged or entangled along
different directions. In the oriented carbon nanotube structure, the plurality of carbon nanotubes
are arranged along the same direction. Alternatively, in the oriented carbon nanotube structure,
when the oriented carbon nanotube structure is divided into two or more regions, a plurality of
carbon nanotubes in each region are aligned along the same direction. In this case, the alignment
directions of carbon nanotubes in different regions are different. The carbon nanotube is a singlewalled carbon nanotube, a double-walled carbon nanotube, or a multi-walled carbon nanotube.
When the carbon nanotube is a single-walled carbon nanotube, the diameter is set to 0.5 nm to
50 nm, and when the carbon nanotube is a double-walled carbon nanotube, the diameter is set to
1 nm to 50 nm, and the carbon nanotube is a multilayer carbon In the case of nanotubes, the
diameter is set to 1.5 nm to 50 nm.
[0016]
The carbon nanotube structure is formed in the shape of a free-standing thin film. Here, a selfsupporting structure is a form which can utilize the said carbon nanotube structure
independently, without using a support material. That is, it means that the carbon nanotube
structure can be suspended by supporting the carbon nanotube structure from opposite sides
without changing the structure of the carbon nanotube structure. The carbon nanotube structure
is flat and has a thickness of 0.5 nm to 1 mm.
[0017]
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The carbon nanotube structure includes at least one carbon nanotube film 143a shown in FIG.
The carbon nanotube film is a drawn carbon nanotube film. The carbon nanotube film 143a is
obtained by drawing from a super-aligned carbon nanotube array (see Non-Patent Document 1).
The single carbon nanotube film 143a includes a plurality of carbon nanotubes whose
longitudinal ends are connected to each other by intermolecular force (see FIG. 4). In the single
carbon nanotube film, a plurality of carbon nanotubes are parallel to the surface of the carbon
nanotube film, and the plurality of carbon nanotubes are connected end to end along the same
direction. Here, a very small number of carbon nanotubes are randomly arranged. The carbon
nanotube film 143a can be formed into a net-like structure by connecting adjacent parallel
carbon nanotubes from the very small number of carbon nanotubes. However, as shown in FIG.
3, the extremely small amount of carbon nanotubes does not affect the structure of the carbon
nanotube film 143a. The carbon nanotube film 143a has a width of 100 μm to 10 cm and a
thickness of 0.5 nm to 100 μm.
[0018]
The carbon nanotube structure may include a plurality of stacked carbon nanotube films. In this
case, the adjacent carbon nanotube films are bonded by an intermolecular force. The carbon
nanotubes in the adjacent carbon nanotube film cross each other at an angle of 0 ° to 90 °.
When the carbon nanotubes in the adjacent carbon nanotube film intersect at an angle of 0 ° or
more, a plurality of micro holes are formed in the carbon nanotube structure. Alternatively, the
plurality of carbon nanotube films may be juxtaposed without gaps.
[0019]
The method of manufacturing the carbon nanotube film includes the following steps.
[0020]
The first step provides a carbon nanotube array.
The carbon nanotube array is a super aligned carbon nanotube array (see Super Aligned Array of
Carbon Nanotubes, Non-Patent Document 1), and a method of manufacturing the super aligned
carbon nanotube array employs a chemical vapor deposition method. The manufacturing method
includes the following steps. In step (a), a flat base is provided, and the base is any one of a P-
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type silicon base, an N-type silicon base and a silicon base on which an oxide layer is formed. In
the present example it is preferred to choose a 4 inch silicon base. In step (b), a catalyst layer is
uniformly formed on the surface of the base. The material of the catalyst layer is any one of iron,
cobalt, nickel and alloys of two or more thereof. In step (c), the base on which the catalyst layer is
formed is annealed in air at 700 ° C. to 900 ° C. for 30 minutes to 90 minutes. In step (d), the
annealed base is placed in a reactor and heated with a protective gas at a temperature of 500 °
C. to 740 ° C., and then a gas containing carbon is introduced to react for 5 minutes to 30
minutes It can be done to grow Superaligned array of carbon nanotubes (Non-patent Document
1). The height of the carbon nanotube array is 100 micrometers or more. The carbon nanotube
array comprises a plurality of carbon nanotubes parallel to one another and growing
perpendicularly to the base. The carbon nanotubes are partially intertwined with one another
because of their long length. By controlling the growth conditions, the carbon nanotube array is
free of impurities such as, for example, amorphous carbon and metal particles as remaining
catalyst.
[0021]
In the present embodiment, as the gas containing carbon, for example, active hydrocarbons such
as acetylene, ethylene, methane and the like are selected, and ethylene is preferably selected. The
protective gas is nitrogen gas or inert gas, preferably argon gas.
[0022]
The carbon nanotube array provided by the present example is not limited to the production
method described above, and may be produced by an arc discharge method or a laser
evaporation method.
[0023]
In the second step, at least one carbon nanotube film is stretched from the carbon nanotube
array.
First, it has a plurality of carbon nanotube ends using tools such as tweezers. For example, a tape
having a certain width is used to have the ends of a plurality of carbon nanotubes. Next, the
plurality of carbon nanotubes are drawn at a predetermined speed to form a continuous carbon
nanotube film composed of a plurality of carbon nanotube segments.
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[0024]
In the step of drawing the plurality of carbon nanotubes, when the plurality of carbon nanotubes
are respectively detached from the base, the carbon nanotube segments are joined end to end by
an intermolecular force to form a continuous carbon nanotube film ( See Figure 5). Referring to
FIGS. 3 and 4, the single carbon nanotube film 143a includes a plurality of carbon nanotube
segments 143b. The plurality of carbon nanotube segments 143b are connected end to end by
intermolecular force along the length direction. Each carbon nanotube segment 143b includes a
plurality of carbon nanotubes 145 connected by intermolecular force in parallel to each other.
The lengths of the plurality of carbon nanotubes 145 are the same in the single carbon nanotube
segment 143b. Toughness and mechanical strength of the carbon nanotube film 143a can be
enhanced by immersing the carbon nanotube film 143a in an organic solvent. The heat capacity
per unit volume of the carbon nanotube film immersed in the organic solvent is reduced.
[0025]
In order to enhance mechanical strength and toughness of the carbon nanotube structure, two or
more carbon nanotube films may be laminated to form the carbon nanotube structure. In this
case, the carbon nanotubes in the adjacent carbon nanotube film intersect at 0 to 90 °. The light
transmittance of the carbon nanotube structure is related to the number of laminated carbon
nanotube films. That is, as the number of stacked carbon nanotube films increases, the carbon
nanotube structure becomes thicker and the light transmittance thereof becomes lower. In the
present embodiment, the carbon nanotube structure has a thickness of 0.5 nm to 1 mm. When
the thickness of the carbon nanotube structure is in the range of 0.5 nm to 99 nm, the light
transmittance of the carbon nanotube structure may reach 86% to 95%.
[0026]
In addition, the carbon nanotube structure 133 includes at least one composite carbon nanotube
film. In the composite carbon nanotube film, at least one conductive layer is coated on the
surface of each carbon nanotube in the drawn carbon nanotube film. Thus, the resistance of the
drawn carbon nanotube film can be reduced, and the voltage for driving the acoustic projection
screen 130 can be reduced. The conductive layer includes a wetting layer and a conductive layer.
The wetting layer is disposed closest to the outer surface of the carbon nanotube and contacts
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the outer surface of the carbon nanotube. The conductive layer is disposed to cover the wetting
layer. Since carbon nanotubes are difficult to wet with metal, the carbon nanotubes and the
conductive layer can be effectively bonded by providing the wet layer. The wetting layer is made
of nickel (Ni), palladium (Pd), titanium (Ti) and an alloy of one of them. The thickness of the
wetting layer is 1 nm to 10 nm. In the present embodiment, the wetting layer is made of nickel
and has a thickness of 2 nm. The wet layer may not be provided. The conductive layer is
provided to enhance the conductivity of the carbon nanotube composite. The conductive layer is
made of gold, copper, silver and alloys thereof. The thickness of the conductive layer is 1 nm to
20 nm. In the present embodiment, the conductive layer is made of gold and has a thickness of
15 nm.
[0027]
In addition, the conductive layer includes a transient layer and an antioxidant layer. The
transition layer is disposed to cover the wetting layer. The antioxidative layer is provided to cover
the conductive layer. The transient layer is provided to couple the wetting layer and the
conductive layer. The transition layer is made of copper, silver and an alloy of one of them. The
thickness of the transient layer is 1 nm to 10 nm. In the present embodiment, the transient layer
is made of copper and has a thickness of 2 nm. The transition layer may not be installed. The
anti-oxidation layer is provided to prevent oxidation of the carbon nanotube composite. The
antioxidative layer is made of an antioxidative metal such as copper and platinum and an alloy of
one of them. The thickness of the antioxidant layer is 1 nm to 10 nm. In the present embodiment,
the antioxidant layer is made of platinum and has a thickness of 2 nm. The antioxidative layer
may not be provided.
[0028]
When the carbon nanotube structure includes a single carbon nanotube film, the conductive
layer may be formed of carbon in the carbon nanotube film by physical vapor deposition (PVD)
such as vacuum evaporation or sputtering. It is deposited and formed on the surface of the
nanotube. In the present embodiment, a vacuum evaporation method is used. When the carbon
nanotube structure includes several carbon nanotube films, the conductive layer is deposited on
each of the carbon nanotube films, and then the carbon nanotubes on which the conductive layer
is stacked are stacked. After depositing different metals on the carbon nanotubes, the resistance
of the carbon nanotube structure is reduced.
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[0029]
Since the heat capacity per unit area of the carbon nanotube structure 133 is very small and the
specific surface area is very large, pressure waves can be generated in the surrounding medium
by the temperature wave generated in the carbon nanotube structure 133. When a signal (for
example, an electrical signal) is transferred to the carbon nanotube structure 133, heat is
generated in the carbon nanotube structure 133 by the signal strength and / or the signal. The
diffusion of the temperature wave thermally expands the surrounding air to produce a sound. In
contrast to this, the principle of generating sound by pressure waves generated by mechanical
vibration of the diaphragm in the conventional speaker is largely different. When the input signal
is an electrical signal, the carbon nanotube structure 133 operates according to an electrothermal-sound conversion method, but when the input signal is an optical signal, the carbon
nanotube structure 133 is an optical signal. -Operate by heat-sound conversion system. The
energy of the optical signal is absorbed by the carbon nanotube structure 133 and emitted as
heat. As the radiation of heat changes the pressure intensity of the surrounding medium (the
environment), a detectable signal can be generated.
[0030]
Referring to FIGS. 6 and 7, a plurality of recesses 140 are formed on the surface of the curtain
cloth 131 in contact with the carbon nanotube structure 133 in order to expand the area in
which the carbon nanotube structure 133 and the surrounding air are in contact. can do. Thus,
the sound produced by the carbon nanotube structure 133 can be transmitted from the curtain
cloth 131 to the audience. When the carbon nanotube structure 133 is installed on the first
surface 137 of the curtain cloth 131, a plurality of recesses 140 are formed on the first surface
137. When mounted on the two surfaces 138, a plurality of recesses 140 can be formed in the
second surface 138. Thus, the carbon nanotube structure 133 is suspended on the recess 140.
[0031]
When the carbon nanotubes in the carbon nanotube structure 133 are arranged along the same
direction and parallel to the surface of the carbon nanotube structure 133, the carbon nanotube
structure 133 can be used as a polarizing plate. The carbon nanotube structure 133 can emit
light polarized along a direction perpendicular to the long axis of the carbon nanotube, and
absorb light polarized along a direction parallel to the long axis of the carbon nanotube.
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[0032]
The first electrode 134 and the second electrode 135 are spaced apart from each other by a
predetermined distance and disposed on one surface of the carbon nanotube structure 133. The
first electrode 134 and the second electrode 135 are electrically connected to the carbon
nanotube structure 133. The first and second electrodes 134 and 135 may transmit an electrical
signal from an audio signal device (not shown) to the carbon nanotube structure 133. In the
present embodiment, the first electrode 134 and the second electrode 135 are arranged
perpendicularly to the long axis direction of the carbon nanotubes in the carbon nanotube
structure 133. The first electrode 134 and the second electrode 135 may be made of any
conductive material of metal, conductive adhesive, carbon nanotube, and ITO. In the present
embodiment, the first electrode 134 and the second electrode 135 are obtained by applying
silver paste to the curtain cloth 131. The widths of the first electrode 134 and the second
electrode 135 may be 1 μm to 5 mm, respectively, and the lengths thereof may be equal to the
length of the curtain cloth 131.
[0033]
Furthermore, an amplifier can be installed between the audio signal device and the first electrode
134 and the second electrode 135. The signal from the audio signal device is amplified and then
transferred to the carbon nanotube structure 133. Thus, the carbon nanotube structure 133 can
be driven with a sufficient voltage to generate a sound wave that can be heard by the human ear.
[0034]
Referring to FIG. 8, the acoustic projection screen 130 may include a plurality of first electrodes
134 and a plurality of second electrodes 135. The plurality of first electrodes 134 and the
second electrodes 135 are alternately arranged in parallel. The plurality of first electrodes 134
are electrically connected by a first conductive element 150, and the plurality of second
electrodes 135 are electrically connected by a second conductive element 152. When a signal
from an audio signal device is transferred to the first electrode 134 and the second electrode
135, the distance between the first electrode 134 and the second electrode 135 is small. The
applied voltage can be reduced. The distance between the first electrode 134 and the second
electrode 135 is preferably the same.
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[0035]
Since sound and images can be generated synchronously with the acoustic projection screen 130
by generating sound with the carbon nanotube structure 133, a conventional speaker is not
necessary. The carbon nanotube structure used in the present invention is lighter and thinner
than the magnet used for the conventional speaker. Therefore, the acoustic projection screen
using the carbon nanotube structure can be miniaturized. Further, since the carbon nanotube
structure has excellent flexibility, an acoustic projection screen using the carbon nanotube
structure can be wound, organized, and transported conveniently.
[0036]
Referring to FIG. 9, the present invention also provides an image projection system 100 using the
acoustic projection screen 130. Furthermore, the image projection system 100 comprises a
projector 110. The projector 110 projects an image ray onto the acoustic projection screen 130.
[0037]
The projector 110 has an outlet 111. The outlet 111 is disposed to face the first surface 137 of
the curtain cloth 131. The image light beam from the projector 110 is transmitted through the
lens of the projector 110, output from the exit 111 of the projector 110, and projected onto the
acoustic projection screen 130. Furthermore, the projector 110 can include an audio electrical
signal output end 112. The projector 110 may output the audio electrical signal from the audio
electrical signal output end 112 in synchronization with the image beam. The audio electrical
signal is transferred to the carbon nanotube structure 133 by a conductive line (not shown)
connected between the first electrode 134 and the second electrode 135. Of course, if the
projector 110 does not include the audio signal output end 112 and simply emits an image
beam, another audio electrical signal device can be installed.
[0038]
An amplifier 120 may be installed to amplify the audio electrical signal transferred to the carbon
nanotube structure 133. The amplifier 120 may be integrated with the projector 110 or may be
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installed separately from the projector 110. Referring to FIG. 9, in the present embodiment, the
amplifier 120 is disposed between the audio signal output end 112 of the projector 110 and the
first electrode 134 and the second electrode 135. The amplifier 120 includes one input end 121
and two output ends 122. The two output ends 122 are connected to the first electrode 134 and
the second electrode 135, respectively. The input 121 is connected to the audio signal output
end 112 of the projector 110.
[0039]
DESCRIPTION OF SYMBOLS 100 image projection system 110 projector 120 amplifier 121 input
end 122 output end 130 acoustic projection screen 131 screen cloth 133 carbon nanotube
structure 134 1st electrode 135 2nd electrode 137 1st surface 138 2nd surface
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