WO2006106759A1 - 車両用透明アンテナおよびアンテナ付き車両用ガラス - Google Patents
車両用透明アンテナおよびアンテナ付き車両用ガラス Download PDFInfo
- Publication number
- WO2006106759A1 WO2006106759A1 PCT/JP2006/306515 JP2006306515W WO2006106759A1 WO 2006106759 A1 WO2006106759 A1 WO 2006106759A1 JP 2006306515 W JP2006306515 W JP 2006306515W WO 2006106759 A1 WO2006106759 A1 WO 2006106759A1
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- Prior art keywords
- antenna
- transparent
- mesh
- pattern
- antenna pattern
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/1271—Supports; Mounting means for mounting on windscreens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
Definitions
- the present invention relates to a transparent antenna for a vehicle and a glass for a vehicle with an antenna, which are attached to a glass surface of a vehicle and receive terrestrial waves and satellite broadcasts or transmit / receive radio waves.
- the film antenna is attached to a fixed glass surface. Since the rear glass is usually wired with a hot wire for anti-fogging, it is attached to the windshield to avoid interference with the hot wire. There are many cases.
- this type of film antenna for example, (a) an antenna pattern formed of a thin metal wire on a transparent plastic film having electrical insulation, or (b) a metal foil that becomes an antenna is finely punched or the like. Proposals have been made in which a large number of holes are made to have permeability.
- the above-described film antenna (a) has a configuration in which a thin metal wire is bent into an antenna shape and bonded to a transparent plastic film, so that even if the inner or outer force of the automobile is seen, The bent metal wires are conspicuous, which not only impairs the design, but also impairs the driving vision.
- the above-described film antennas (a) and (b) have excellent design and a good driving field of view. It can be expected to secure.
- the transparent conductive film has the property that the surface resistance as a measure of conductivity increases as the film thickness decreases and the transparency increases, which is necessary for the windshield. There is a situation where it is difficult to achieve both the transparency required for the antenna and the low resistance required for the antenna.
- the resistance of the transparent conductive film with ensured transparency is several tens to several hundreds ⁇ , whereas the resistance value required for the antenna must be a very small value of 3 ⁇ or less. Good luck! /
- the present invention has been made in consideration of the problems in the conventional film antenna as described above, has transparency to obtain a good driving field of view without impairing the design of the antenna, and the antenna.
- a transparent antenna for a vehicle capable of realizing the low resistance required for the vehicle and a glass for a vehicle with an antenna are provided.
- the present invention includes an insulating sheet-like transparent substrate and an antenna pattern formed in a planar shape on the surface of the transparent substrate, and the conductive portion of the antenna pattern is formed from a conductive thin film having a network structure.
- the vehicular transparent antenna in which the outline of each mesh is composed of ultra-thin bands of approximately equal width, the band width of the ultra-thin bands is 30 m or less, and the light transmittance of the antenna pattern forming portion is 70% or more. It is.
- the mesh structure is configured by a planar mesh in which meshes having the same shape and size are regularly continuous on a plane, and a part of the antenna pattern is formed with respect to a plurality of meshes. If the identification pattern is added linearly or in a strip shape to a plurality of mesh outlines, the amount of light passing through the mesh is attenuated more than the amount of light passing through the antenna pattern. Pattern power can also be raised.
- the identification pattern can be formed by making the outline of the mesh constituting the planar mesh a thick band, and a part of the mesh structure of the mesh structure on the antenna pattern is 1 It can also be formed by shifting within a range not exceeding one mesh size and superimposing it on the antenna pattern. If such an identification pattern is formed continuously or intermittently on the antenna pattern, letters and designs can be formed on the transparent antenna surface.
- the mesh structure is configured by a planar mesh regularly continuous on a plane.
- a gradation portion that reduces a difference in brightness generated between the antenna pattern and the antenna pattern non-formed portion can be provided in a boundary region between the antenna pattern and the antenna pattern non-formed portion in the transparent substrate.
- the gradation portion can be formed by missing a part of the mesh outline of the antenna pattern in the boundary region or by making the mesh coarse.
- the gradation portion can be formed by increasing the missing width of the mesh outline or the opening width of the mesh stepwise from the antenna pattern side toward the antenna pattern non-formation portion side. .
- the gradation portion forms a network structure by arranging vertical conductive lines and horizontal conductive lines in a lattice pattern, and at least one of the vertical conductive lines and the horizontal conductive lines is formed.
- One of them can also be formed by a force for missing a part thereof, or by increasing the distance between the conductive lines from the antenna pattern side toward the antenna pattern non-forming part side.
- the antenna pattern can be formed in a continuous band shape by having a slit in a part of the mesh structure.
- the width of the slit should not exceed the maximum mesh size.
- the antenna pattern can be formed in a meandering shape by alternately forming a plurality of slits with a predetermined length from different directions in the mesh structure.
- the antenna pattern can be formed by spirally forming a single slit toward the center of the mesh structure.
- the maximum size of the mesh is preferably lmm.
- the shape of the mesh can be constituted by a geometric figure.
- the antenna pattern can be composed of an ultrafine metal wire made of copper or a copper alloy.
- a part of the conductive part is provided with a power feeding electrode, and a transparent protective film corresponding to the electrode is provided with a through-hole part to expose the electrode.
- the surface of the ultrathin band is subjected to a low reflection treatment.
- a transparent adhesive layer can be formed on the surface of the transparent substrate opposite to the conductive part forming side.
- the transparent antenna for a vehicle of the present invention having the above-described configuration, it is possible to achieve a low resistance required for the antenna, having transparency that can provide a good driving field of view.
- the glass for an antenna with an antenna of the present invention includes a transparent antenna for a vehicle having the above-described configuration in which a feeding electrode is provided in a part of the conductive portion, and the laminated glass with the electrode protruding.
- the gist is that it is buried in the joint surface.
- a transparent antenna can be embedded in the joining surface of two pieces of glass in the process of manufacturing laminated glass, so that the surface of the windshield is transparent as in the case of retrofitting. There is no step for the antenna thickness, and the design can be further improved. Moreover, stable antenna performance can be maintained by embedding in glass.
- FIG. 1 is a front view showing a usage state of a transparent antenna according to a first embodiment of the present invention.
- FIG. 2 is an enlarged view of the transparent antenna of FIG.
- FIG. 3 is a cross-sectional view taken along arrow AA in FIG.
- FIG. 4 is an enlarged view of a main part showing a basic pattern of an ultrafine metal wire constituting the conductive portion of FIG.
- FIG. 5 is a view corresponding to FIG. 4 showing a modification of the antenna pattern.
- FIG. 6 is a view corresponding to FIG. 4 and showing another modified example of the antenna pattern.
- FIG. 7 is an enlarged view of the transparent antenna according to the second embodiment of the present invention.
- FIG. 8 is an enlarged view of part C in FIG.
- FIG. 9 is an enlarged view of a part of the character portion of FIG.
- FIG. 10 is an enlarged view of the character shadow portion of FIG.
- Figures l l (a) to (c) are explanatory diagrams showing the character design method by emphasis.
- FIG. 12 is an explanatory diagram showing a character design method by shifting a figure.
- FIG. 13 is an explanatory diagram showing a character design method using both emphasis and figure shift.
- FIG. 14 is an enlarged view of a transparent antenna according to a third embodiment of the present invention.
- FIG. 15 is a cross-sectional view taken along the line DD in FIG.
- FIG. 16 is an enlarged view of part E in FIG.
- FIG. 17 is an enlarged view of part F in FIG.
- FIG. 18 is an enlarged view of part G in FIG.
- FIG. 19 is an enlarged view of portion H in FIG.
- FIG. 20 is an explanatory diagram showing a first modification of gradation in the third embodiment.
- FIG. 21 is an explanatory view showing a second modification of gradation.
- FIG. 22 is an explanatory view showing a third modification of gradation.
- FIG. 23 is an explanatory diagram showing a fourth modification of gradation.
- FIG. 24 is a plan view of a transparent antenna according to a fourth embodiment of the present invention.
- FIG. 25 is an enlarged view of part J in FIG.
- FIG. 26 is an explanatory diagram for explaining the arrangement of slits.
- FIG. 27 is an explanatory diagram for explaining the arrangement of the slits.
- FIG. 28 is an explanatory diagram showing the mesh shape of the antenna pattern and the arrangement of the slits.
- FIG. 29 is an explanatory diagram showing the mesh shape of the antenna pattern and the arrangement of the slits.
- FIG. 30 is an explanatory diagram showing the mesh shape of the antenna pattern and the arrangement of the slits.
- FIG. 31 is an explanatory diagram showing the mesh shape of the antenna pattern and the arrangement of the slits.
- FIG. 32 is a plan view showing a first formation pattern of slits.
- FIG. 33 is a plan view showing a second formation pattern of slits.
- FIG. 34 is a plan view showing a third formation pattern of slits.
- FIG. 35 is a plan view showing a fourth formation pattern of slits.
- FIG. 36 is a plan view showing a fifth formation pattern of slits.
- the transparent antenna for a vehicle of the first embodiment (hereinafter abbreviated as “transparent antenna”) has a transparency that provides a good driving field of view and a low resistance.
- FIG. 1 shows a state where the transparent antenna is attached to a windshield of an automobile.
- the transparent antennas 1 and 2 are arranged on the left and right upper portions of the windshield 3.
- An antenna cord 4 is connected to the left transparent antenna 1, an antenna cord 5 is also connected to the right transparent antenna 2, and an output end of each antenna cord 4 and 5 is connected to an amplifier unit 6.
- the antenna output cord 7 output from the amplifier unit 6 is connected to a TV tuner built in the monitor 8 of the power navigation!
- FIG. 2 is an enlarged view of the transparent antenna 1. Since the transparent antenna 2 has the same configuration as the transparent antenna 1, its description is omitted.
- a transparent antenna 1 is obtained by forming an antenna pattern with a conductive portion lb in a planar shape on a transparent plastic sheet la as a transparent substrate having electrical insulation.
- a pair of electrode portions Id are opposed to each other with a gap lc between two antenna patterns formed in a horizontally long rectangular shape.
- a transparent resin film such as polycarbonate, acrylic, polyethylene terephthalate, triacetyl cellulose, etc. can be used.
- a sheet-like transparent glass can also be used.
- the conductive portion lb has a planar shape over substantially the entire surface of the transparent plastic sheet la. Is formed.
- the conductive part lb is composed of a conductive thin film having a network structure, and includes copper, nickel, aluminum, gold, A metal film such as silver, a conductive paste film containing these metal fine particles, or a carbon-based film, and further by photo etching of a metal thin film formed on the transparent plastic sheet la or by etching with a printing resist. It is formed into a fine mesh pattern by a method such as printing a conductive resin paste.
- the antenna pattern is formed by photoetching, a resist film is formed on a metal film, exposed using a photomask, and developed with a developer to form an antenna pattern of a resist film. This is etched with an etchant, and the resist film is peeled and removed to form an antenna pattern having an extra fine metal line force.
- the antenna pattern of the resist film is printed on the metal film by a method such as screen printing, gravure printing, inkjet, etc., and the portion other than the resist coating portion on the metal film is etched with the etching solution.
- the metal film antenna pattern is formed by etching and stripping the resist film.
- the antenna pattern is printed on the transparent substrate with a conductive paste containing metal fine particles, a carbon paste, or the like to form a conductive antenna pattern.
- the low reflection treatment include a surface treatment such as a chemical conversion treatment or a tacking treatment.
- a chemical conversion treatment a low reflection layer is formed on the metal surface by oxidation treatment or sulfuration treatment.
- copper is used as the material of the ultrafine metal wire, and an oxide film is formed on the surface by oxidation treatment.
- the surface of the ultrafine metal wire can be processed to black with antireflection properties without reducing the cross-sectional dimension of the ultrafine metal wire.
- the ultrafine metal wire is plated with, for example, black chrome as the plating treatment
- the surface of the ultrafine metal wire can be treated with black having antireflection properties.
- it can be processed into brown by applying copper plating with high current density.
- the electrode part Id is for attaching a power supply part (not shown) of the antenna cord 4, and the electrode part Id is a rectangular shim electrically connected to the mesh pattern. It is formed with a cheat.
- FIG. 3 shows a cross section taken along the line AA in FIG.
- a conductive portion lb is formed on the transparent plastic sheet la, and the conductive portion lb is further covered with a transparent cover layer (transparent protective film) le.
- a transparent cover layer transparent protective film
- the transparent cover layer le can be formed by laminating a transparent film on the antenna pattern formed of the conductive portion lb using a transparent adhesive or pressure-sensitive adhesive. Then, a transparent resin is applied to the antenna pattern to a predetermined thickness.
- a part of the transparent cover layer le is provided with a through hole If, and the electrode part Id is exposed through the through hole If.
- the feeding portion of the antenna cord 4 is attached to the exposed electrode portion Id.
- a transparent adhesive layer lg is provided on the surface of the transparent plastic sheet la opposite to the conductive portion lb, and a release sheet lh is provided on the surface of the transparent adhesive layer lg.
- the transparent adhesive layer lg does not impair the transparency of the antenna, for example, an acrylic used as a paste material for a smoke-like film attached to the windshield of an automobile for the purpose of reducing ultraviolet rays.
- System adhesives can be used.
- the transparent antenna 1 When the transparent antenna 1 is attached to the windshield as a retrofit, the release sheet lh is peeled off to expose the transparent adhesive layer lg, and the transparent antenna 1 is attached to the front glass via the transparent adhesive layer lg. Will wear. That is, in the transparent antenna 1 shown in FIG. 3, the upper surface is directed to the indoor side and the lower surface is directed to the windshield.
- the transparent antenna 1 is not limited to being attached as a separate part to the windshield, but can also be embedded in the windshield in advance.
- the transparent antenna 1 can be sandwiched between the two glasses in the windshield manufacturing process.
- the transparent adhesive layer lg must be provided. Also good.
- the transparent cover layer le is formed as necessary.
- Fig. 4 is an enlarged view of a part of the antenna pattern to show a mesh.
- the light transmittance which is a measure of transparency, is the total light transmittance for the total amount of light that has passed through the sample surface from light of any wavelength emitted from a light source having a specific color temperature. means.
- this light transmittance is less than 70%, the difference between the light transmittance of the windshield and the light transmittance of the transparent antenna 1 becomes large, and the antenna pattern of the transparent antenna 1 appears dark. Therefore, the presence of the antenna becomes an obstacle. If it interferes with the driving vision of the windshield, there are safety issues.
- the light transmittance was measured using a spectrophotometer (model number NDH2000) manufactured by Nippon Denshoku Industries Co., Ltd. However, the light transmittance in the air layer is 100%.
- the transparent cover layer le is formed on the transparent antenna 1
- the light transmittance is measured in a state including the transparent cover layer le, and the transparent adhesive layer lg is provided. If the transparent adhesive layer lg is included, it is measured.
- the line width w of the X direction extra fine metal wire (extra fine band) li and the Y direction extra fine metal line (extra fine band) lj that form a rectangular outline is formed to be equal to 30 m or less, respectively. ing. If the line width w force exceeds S30 ⁇ m, the mesh of the antenna pattern becomes conspicuous and the design is also poor. If the line width w is 30 m or less, the presence of the antenna pattern is difficult to recognize. It should be noted that if the thickness of the ultrafine metal wire is set such that the aspect ratio of the line width Z thickness t is 0.5 or more, it becomes easy to make an accurate antenna pattern.
- the light transmittance of the transparent antenna 1 is determined by the line width of the fine metal lines li and lj and the size of the opening B formed by being surrounded by the fine metal lines li and lj. By selecting the combination, light transmittance of 70% or more can be secured.
- FIG. 5 and FIG. 6 show modified examples of the antenna pattern.
- the antenna pattern shown in Fig. 5 has a mesh shape formed by connecting a hexagonal shape in the X direction, Ya direction, and b direction.
- the line width w of the ultrafine metal wire lk having a hexagonal outline is 30 ⁇ m or less.
- the antenna pattern shown in Fig. 6 has a mesh shape with a ladder shape as a nucleus and continuous in the X and Y directions.
- the line widths w of the ultrafine metal wires 11 and 1 m that form the ladder-shaped outline are 30 ⁇ m or less, respectively.
- the antenna pattern is continuous with a rectangle as a nucleus, continuous with a polygon as a nucleus, or continuous with a ladder shape as a nucleus.
- the one having a square as a core is particularly preferable because the antenna pattern is difficult to be recognized as a streak compared to other polygonal shapes.
- the line of the ultrathin band along the continuous direction becomes zigzag, so it appears thicker by the amplitude of the zigzag, and as a result, the ultrathin band expands. It looks like.
- the square is continuous as a nucleus
- the line of the ultrathin strip along the continuous direction is straight, so there is no concern that it will appear thicker than the original width.
- the antenna pattern is so thin that it is less than 30 m, and its antenna pattern is difficult to recognize.
- the long side direction and the short side direction of the rectangle have different pitches.
- the square is not limited to a completely square, but includes a chamfered square.
- a 12 m thick copper foil with low reflection treatment on both sides was bonded with a transparent adhesive, and an antenna pattern was prepared by photoetching.
- a square mesh pattern having a line width of 15 m and a line spacing of 700 m was produced.
- an acrylic transparent adhesive is used on the surface of the conductive part on which the antenna pattern is formed.
- a transparent polyethylene terephthalate cover film (cover layer) having a thickness of 50 ⁇ m was provided. However, for the electrode part, the opening force formed by cutting a part of the cover film is exposed.
- a transparent acrylic double-sided adhesive film with a release sheet for attaching the transparent antenna 1 to the windshield was attached to the surface (back surface) opposite to the conductive part of the transparent polyethylene terephthalate film.
- An antenna pattern is formed on a transparent polyethylene terephthalate film, covered with a force bar film, and a transparent acrylic double-sided adhesive film with a release sheet is attached to the back surface of the transparent polyethylene terephthalate film.
- a transparent antenna 1 was fabricated by cutting the outside along the pattern.
- the affixed transparent antenna 1 could hardly recognize the presence of the antenna pattern even when viewed from the driver's side and passenger's side, and did not obstruct the driving field of view.
- An antenna pattern was produced on a transparent polycarbonate film having a thickness of 100 ⁇ m by screen printing using a silver paste.
- Conductive part has a line width of 30 m, pitch between lines in X direction 7
- a regular hexagonal mesh pattern of 00 ⁇ m was prepared.
- the transparent antenna 1 is used in the manufacturing process of laminated glass for automobile windshields.
- the transparent antenna 1 was sandwiched with the pole part Id protruding from the periphery of the glass, and the windshield was incorporated into the automobile frame.
- the light transmittance of the transparent antenna 1 is measured to be 75%, and the presence of the antenna pattern can hardly be recognized even when viewed from the driver's side and the passenger's side, and does not obstruct the driving view. It was.
- the transparent antenna of the second embodiment is designed so that characters and patterns can be designed on the antenna pattern.
- a transparent antenna 10 shown in Fig. 7 is obtained by forming an antenna pattern as a conductive portion 10b in a planar shape on a transparent plastic sheet 10a as a transparent substrate having electrical insulation, and having a horizontally long rectangular shape.
- An antenna terminal 10c is formed in the upper left part of the antenna pattern formed in FIG.
- 10d is a logo designed on the transparent antenna 10, and a method of forming this logo will be described later.
- the transparent plastic sheet 10a is made of the same material as the transparent plastic sheet la shown in FIG. 2, and the conductive portion 10b is also the same in composition and the same material as the conductive portion lb shown in FIG. The power is composed.
- the antenna terminal 10c is for attaching a feeding portion (not shown) of the antenna cord 4, and the antenna terminal 10c is formed of a rectangular sheet electrically connected to the mesh pattern. It has been.
- FIG. 8 is an enlarged view of part C in FIG.
- the logo 10d is formed on the mesh portion 10e formed of the conductive portion 10b, and is configured by a combination of a character portion 10f and a character shadow portion 10g representing a shadow of the character portion 10f.
- the character portion 10f is composed of a conductive portion (thick band) 10h made of a conductive wire wider than the conductive wire of the mesh portion 10e.
- the light transmittance is changed by setting the opening area of the opening lOj in the character part lOf smaller than the opening area of the opening part lOi, thereby enhancing the boundary between the mesh part 10e and the character part 10f.
- the character part 10f is raised.
- the character shadow portion 10g shown in FIG. 8 has a force that is the same width as the conductive line of the character portion 10f, as shown in FIG.
- the character shadow portion 10g is emphasized by setting the opening area of the opening portion 10m in the character shadow portion 10g smaller than the opening area of the opening portion 10j in the character portion 10f. It has become.
- the opening area of the opening 10m in the character shadow portion 10g is set to approximately 3Z4 to LZ4 of the opening area of the character portion 10f!
- the character portion 10f and the character shadow portion 10g function as an identification pattern for identifying a part of the antenna pattern by attenuating a certain amount of light passing through the mesh.
- the character portion 10f is represented by a dark mesh pattern on the light-colored mesh portion 10e, and the character shadow portion 1 Og which has a dense mesh pattern power on the right side of the character portion 10f. Is formed.
- the logo 10d formed in this way maintains a mesh pattern having openings only with differences in thickness and density, so that it does not lose translucency.
- FIGS. 11 to 13 show various methods for forming an identification pattern.
- Fig. 11 (a) shows a case where the conductive portion 10h is formed using a conductive wire wider than the conductive wire of the mesh portion 10e with the mesh of the mesh portion 10e as a unit, and the logo "N" is emphasized. is there.
- Figure (b) shows that the conductive part 10 is formed using a conductive wire that is wider than the conductive line of the mesh part 10e in units of a plurality of meshes (four meshes in the figure), and a U-shaped logo is formed. It is emphasized.
- one mesh is further divided into a plurality of meshes (4 divisions in the figure), a cross-shaped conductive part 10 'is formed in the mesh, and the logo "N" is emphasized. It is.
- FIG. 12 shows the logo “S” in a state where the character pattern 10 n is shifted to a part of the mesh portion 10 e in which the opening 10 i is a square, and the character pattern 10 ⁇ is formed.
- the square shape is the same size as the square shape that makes up the mesh part 10e. Formed and translated in the diagonal direction of the opening lOi in the mesh portion 10e.
- FIG. 13 is a combination of the enhancement method described in FIG. 11 and the shift enhancement method described in FIG. By using various emphasis methods in this way, not only characters but also symbols can be expressed arbitrarily.
- the force formed by continuously forming the character pattern on the antenna pattern If this character pattern can be recognized as a character, for example, it may be formed intermittently by skipping one mesh.
- a 125 m thick transparent polyester film and 18 ⁇ m thick copper foil were laminated with an adhesive, and a transparent adhesive layer was formed on the opposite side of the polyester film from the copper foil.
- This photomask has an antenna pattern mainly having a square lattice (conductive portion line width 20 ⁇ m, conductive portion wiring pitch 500 m), and an aperture ratio is partially formed in the antenna pattern.
- Different square lattices conductive part line width 40 ⁇ m, conductive part wiring pitch 500 ⁇ m are formed along the shape of the letters.
- the antenna pattern having a square lattice with different aperture ratios was produced by CAD data input on a personal computer and an automatic drawing device.
- the resist other than the antenna pattern is removed using a developing solution by a conventionally known developing process, and further, etching is performed and the resist is removed using a stripping solution. Designed.
- the translucent antenna manufactured in this way has a square lattice (see lOh) with different aperture ratios appearing as characters and formed on the antenna pattern. It was confirmed that the letters were integrated with the antenna pattern and the design was excellent. In addition, the square lattice (10h) parts with different aperture ratios are also transparent because the translucency is ensured. 'The sex was good.
- This photomask is mainly composed of a square lattice (wire width of the conductive part 30 ⁇ m, wiring pitch of the conductive part)
- the antenna pattern has an opening of 800 m), and a square lattice (wire width of the conductive part 30 ⁇ m, wiring pitch of the conductive part 800 ⁇ m) is translated in part of the antenna pattern.
- a pattern is formed along the shape of the letter.
- the translucent antenna manufactured in this way appears as letters with a square lattice (see 10 ⁇ ) with different aperture ratios shifted as shown in Fig. 12, resulting in transparency.
- a translucent antenna excellent in design and design was obtained.
- a transparent anchor layer in which an electroless plating catalyst was dispersed was formed on a 125 m thick transparent polyester film, followed by electroless plating and electroplating to form a 4 / zm thick conductive layer.
- This photomask has a pattern mainly having an opening of a rectangular lattice (line width of the conductive part 20 ⁇ m, wiring pitch of the conductive part: 500 m in the horizontal direction and 900 m in the vertical direction).
- a square lattice in which the aperture ratio is changed by dividing a rectangular lattice into four parts of the tena pattern line width of the conductive part 20 ⁇ m, wiring pitch of the conductive part: 250 m in the horizontal direction X 450 in the vertical direction
- a pattern along the shape of the character is formed in ⁇ m).
- an antenna pattern with openings that are mainly square lattices (the width of the conductive part is 30 m, the wiring pitch of the conductive parts is 500 m), and a square lattice with different opening ratios (conductive parts)
- the conventional well-known etching process and resist removal are performed in the same manner as in Example 3 except that patterning is performed with a screen plate in which character shapes are formed with a line width of 100 ⁇ m and a wiring pitch of 500 ⁇ m of conductive parts).
- the antenna pattern was designed in the form of letters.
- the pattern formation accuracy was lower than that of the photoresist methods shown in Examples 3 to 5 above, a transparent antenna having good transparency and excellent design was obtained.
- the transparent antenna shown in the third embodiment can be naturally harmonized with the windshield while ensuring translucency and antenna performance.
- an antenna pattern 23 as a conductive portion 22 is formed in a planar shape on a transparent plastic sheet 21.
- the antenna pattern 23 includes a strip-shaped pattern portion 23a formed over substantially the entire length in the longitudinal direction of the transparent plastic sheet 21, and a strip-shaped pattern arranged in a state of being parallel to and spaced from the strip-shaped pattern portion 23a.
- the lead terminals 23f and 23g are extended, and antenna terminals 24 and 25 are provided at the tips of the lead parts 23f and 23g.
- the mesh in the conductive portion 22 is configured by regularly repeating geometric figures of the same size and shape, and the transmittance of light passing through the conductive portion 22 is the opening area of the mesh. It can be controlled by adjusting the settings.
- the antenna terminals 24 and 25 are for attaching a feeding portion of an antenna cord (not shown).
- the antenna terminals 24 and 25 are electrically connected to the conductive portion 22. Formed with a sheet of shape.
- FIG. 15 shows a cross section taken along the line DD in FIG.
- a conductive portion 22 having a mesh structure is formed on a transparent plastic sheet 21, and the conductive portion 22 is covered with a transparent protective film 26.
- a part of the transparent protective film 26 is provided with a through hole 26a, and the antenna terminal 25 is exposed through the through hole 26a.
- the antenna cord power supply unit is attached to the exposed antenna terminal 25.
- 27 is a transparent adhesive layer
- 28 is a release sheet
- FIG. 16 is an enlarged view of the E region of FIG. 14, that is, the boundary region between the antenna pattern 23 and the transparent plastic sheet 21 which is the antenna pattern non-formation portion.
- a boundary portion I is formed with a gradation portion 22a for reducing the brightness difference generated between the antenna pattern 23 and the antenna pattern non-forming portion.
- K is a conductive portion region forming an antenna pattern.
- K is the conductive part
- the first region having a lighter gradation (higher light transmittance) than the conductive part region K is shown.
- ⁇ is the fourth brighter tone than the third region ⁇ .
- K represents the fifth region, which is brighter than the fourth region K.
- the light transmittance of the fifth region K is the light ray in the transparent plastic sheet 21.
- 22b represents the outermost peripheral edge of the gradation portion 22a
- 21a represents the right edge of the transparent plastic sheet 21.
- the light transmittance which is a measure of transparency, means the total light transmittance for the total amount of light that has passed through the sample surface with light of any wavelength emitted from a light source having a specific color temperature. If the light transmittance is less than 70%, for example, when the transparent antenna 20 is attached to the windshield of an automobile, the difference between the light transmittance of the windshield and the light transmittance of the transparent antenna 20 becomes large. 20 antenna patterns look dark. Therefore, its presence becomes an obstacle. Especially if the windshield impedes driving visibility, There are also integrity issues.
- the light transmittance is measured using a spectrophotometer (model number NDH2000) manufactured by Nippon Denshoku Industries Co., Ltd.
- the light transmittance in the air layer is 100%.
- the transparent protective film 26 is formed on the transparent antenna 20
- the light transmittance is measured in a state including the transparent protective film 26, and when the transparent adhesive layer 27 is provided, It is measured with the transparent adhesive layer 27 included.
- FIG. 17 is an enlarged view of part F of FIG. 16
- FIG. 18 is an enlarged view of part G of FIG. 16
- FIG. 19 is an enlarged view of part H of FIG.
- the first region K formed outside the conductive portion region K is a mesh.
- the line widths w of the vertical conductive lines 22c and the horizontal conductive lines 22d are each formed to have an equal width of 30 ⁇ m or less.
- the line width w exceeds 30 m, the mesh of the antenna pattern becomes conspicuous, and the design becomes poor. If the line width w is 30 m or less, the presence of the antenna pattern is difficult to recognize. Note that it is easy to make a highly accurate antenna pattern when the aspect ratio of the line width / film thickness t is 0.5 or more.
- the light transmittance of the transparent antenna 20 is determined by the line width of the vertical conductive lines 22c and the horizontal conductive lines 22d and the mesh formed by being surrounded by the conductive lines 22c and 22d. By selecting a combination with the aperture size, a light transmittance of 70% or more can be secured.
- the second region K formed outside the first region K is electrically conductive in the vertical direction.
- the missing range of the intersection of the line 22c and the lateral conductive line 22d is wider than the intersection missing portion N.
- the light transmittance is further increased than the conductive portion region K. Yes.
- the third region K formed outside the second region K has the intersection missing portion P
- gradation gradually increases from the conductive portion 22 (in this embodiment, five steps).
- the boundary portion between the antenna pattern 23 and the transparent plastic sheet 21 is hardly noticeable. Therefore, the existence of the antenna pattern 23 itself can be made inconspicuous.
- FIGS. 20 to 23 show modified examples of the gradation portion 22a.
- the gradation part 22a shown in FIG. 20 is formed by forming a gradation with translucency by leaving the longitudinal conductive line 22c and omitting the right end part of the lateral conductive line 3d at a plurality of positions. It is.
- R indicates the boundary between the conductive portion 22 and the gradation portion 22a
- 22b indicates the outermost peripheral edge of the gradation portion 22a
- 21 indicates a transparent plastic sheet.
- the gradation part 22a shown in FIG. 21 is formed by forming a translucent gradation by leaving the horizontal conductive lines 22d and deleting the vertical conductive lines 22c at a plurality of positions. It is.
- the gradation portion 22a shown in FIG. 22 is a combination of the methods shown in FIGS. 20 and 21, and a plurality of portions of the vertical conductive lines 22c and the horizontal conductive lines 22d are both omitted. A gradation having translucency is formed.
- FIG. 20 and FIG. 21 have substantially the same light transmittance.
- the light transmittance in FIG. 22 is larger than those in FIGS.
- gradation is formed by deleting conductive lines.
- the gradation portion 22a can be formed by gradually increasing the distance between the vertical conductive wires 22c toward the transparent plastic sheet side.
- the gradation portion 22a can function as an antenna even though the gradation effect is lower than that in which the conductive wire is omitted. There is an advantage that can be.
- a transparent polyester film having a thickness of 100 ⁇ m and a copper foil having a thickness of 18 ⁇ m were laminated with an adhesive, and a transparent adhesive layer was formed on the surface of the transparent polyester film opposite to the copper foil.
- This photomask is mainly composed of a square lattice (conducting line width of 20 ⁇ m, conductive line pitch).
- the antenna pattern has an opening of 500 m), and a gradation portion as shown in FIG. 20 is formed at the edge of the antenna pattern.
- the antenna pattern having the square lattice and the gradation portion was prepared by CAD data input on a personal computer and an automatic drawing device.
- the resist other than the antenna pattern is removed using a developing solution by a conventionally known developing process, and further, etching is performed, and the resist is removed using a stripping solution, whereby an antenna pattern having a gradation portion is obtained. Formed.
- the edge of the antenna pattern exhibits a very natural gradation, the boundary between the antenna pattern and the transparent plastic sheet is not recognized, and the presence of the antenna pattern itself It was confirmed that it was difficult to recognize.
- a transparent anchor layer in which an electroless plating catalyst was dispersed on a transparent polycarbonate film with a thickness of 50 m After forming a transparent anchor layer in which an electroless plating catalyst was dispersed on a transparent polycarbonate film with a thickness of 50 m, a low reflection layer was formed on both sides by electroless plating and electric plating. A 5 ⁇ m thick conductive layer was obtained.
- This photomask has an antenna pattern mainly having square lattice openings, and a gradation portion as shown in FIG. 21 is formed at the edge of the antenna pattern.
- a na-pattern was formed (conductive wire width 20 ⁇ m, conductive wire pitch 80 ⁇ m).
- the edge of the antenna pattern exhibits a very natural gradation, the boundary between the antenna pattern and the transparent plastic sheet is not recognized, and the presence of the antenna pattern itself It was confirmed that it was difficult to recognize.
- a transparent anchor layer in which an electroless plating catalyst is dispersed on a transparent polyester film with a thickness of 125 m a conductive layer with a thickness of 4 / zm is formed by electroless plating and electric plating. Formed.
- This photomask mainly has a pattern having an opening of a rectangular lattice (conducting line width 10 ⁇ m, conductive line wiring pitch: 600 m in the horizontal direction and 900 m in the vertical direction).
- a gradation part as shown in FIG. 23 is formed at the edge of the tena pattern.
- an antenna pattern having a gradation portion was formed by performing etching and resist removal.
- the edge of the antenna pattern exhibits a very natural gradation, the boundary between the antenna pattern and the transparent plastic sheet is not recognized, and the presence of the antenna pattern itself It was confirmed that it was difficult to recognize.
- An antenna pattern having a gradation portion was formed by performing a conventionally known etching process and resist removal in the same manner as in Example 7.
- the transparent antenna of the second embodiment it is possible to provide a transparent antenna capable of naturally harmonizing with a mounting target while ensuring translucency and antenna performance.
- the transparent antenna 30 shown in the fourth embodiment is designed to ensure the required antenna length while being compact.
- the antenna pattern 31 in which square meshes are continuously arranged will be described as an example.
- a plurality of slits 32 are formed in a part of the antenna pattern 31 in parallel.
- the slits 32 have a length / force shorter than the longitudinal length L of the antenna pattern 31, and different directional forces are also formed. Accordingly, in FIG. 24, the antenna pattern 31 is formed in a meandering shape.
- 33 indicates a conductive portion.
- Fig. 25 is an enlarged view of a portion J in Fig. 24, where S indicates the slit width and Sa indicates the mesh size.
- the mesh size in this case indicates the diagonal length in the mesh U.
- the slit width S is set in the range of m to the maximum size of the mesh. If the slit width S is less than 20 m, manufacturing becomes difficult, and the slit width S is the maximum size of the mesh. If it exceeds, the slits will stand out and the design will be impaired.
- FIG. 27 shows a case where the slit 32 is formed avoiding the intersection 34 of the conductive portion 33. As is clear from the comparison with FIG. 26, the presence of the slit 32 is not noticeable.
- FIG. 28 shows an antenna pattern 31 in which the vertical conductive lines 35a and the horizontal conductive lines 35b are arranged at equal intervals to form a square mesh 35c.
- One of the antenna patterns 31 is shown in FIG. In this part, slits 32 are formed along the arrangement direction of the meshes 35c (vertical direction in the figure).
- the slit width S is set to approximately 1Z4 of the dimension Sa of the mesh 35c. The presence of the slit 32 is hardly noticeable because it does not pass through the intersection 34.
- a transparent antenna as shown in Fig. 29 was produced by photoetching the metal conductive layer.
- the line width of the conductive portion 31 is set to 12 m so that the opening of the mesh 35c is a regular hexagon, and the length of one side of one mesh 35c is set to Sb force 00 ⁇ m.
- a slit 32 having a width S of 100 / zm was formed on the antenna pattern 31 in the vertical direction.
- the transparent antenna formed in this way was strong enough that neither the antenna pattern 31 nor the slit 32 formed in the antenna pattern 31 could be visually recognized. As a result, a transparent antenna without degrading the design was obtained.
- a metal conductive layer with a thickness of 12 m is formed by plating, and this is slit using photolithography An antenna pattern containing was formed.
- a transparent antenna as shown in Fig. 30 was produced by chemical etching.
- the line width of the conductive portion 33 is set to 20 ⁇ m and the length of one side in one mesh 35c is set to 900 ⁇ m so that the opening of the mesh 35c is an equilateral triangle.
- slits 32 having a width S of 80 m force were formed obliquely along the mesh arrangement direction.
- a transparent acrylic resin having a thickness of 100 m was coated on the metal surface side of the film on which the antenna pattern 31 was formed to form a transparent protective layer.
- a transparent polyethylene terephthalate film with a thickness of 100 ⁇ m On a transparent polyethylene terephthalate film with a thickness of 100 ⁇ m, a copper foil with a thickness of 18 ⁇ m treated with low reflection by chemical treatment on both sides is adhered with a transparent adhesive, and slits are formed using photolithography.
- a transparent antenna as shown in Fig. 31 was produced by forming the antenna pattern and applying chemical etching.
- the line width of the conductive portion 33 is 15 m so that the opening of the mesh 35c is rectangular, the length of the short side Sc in the single mesh 35c is 300 ⁇ m, and the length of the long side Sd is A slit 32 having a width S of 40 ⁇ m was formed on the antenna pattern 31 in the horizontal direction.
- the antenna pattern with slits is printed with high precision using nano-particle silver paste, so that the conductive layer thickness as shown in Fig. 27 is obtained.
- a transparent antenna with a thickness of 10 ⁇ m was fabricated.
- the line width of the conductive portion 33 is 30 so that the opening of the mesh 35c is a square.
- the length of one side Sa in one mesh 35c is set to lmm, and a slit 32 with a width S force ⁇ 150 ⁇ m force on such an antenna turn 31 is 45 ° to the mesh 35c.
- the slant was formed at an angle of.
- a transparent anchor layer in which a plating catalyst was dispersed was formed on a transparent polyethylene terephthalate film having a thickness of 50 ⁇ m, and then a metal conductive layer having a thickness of 5 ⁇ m was formed by applying copper plating.
- a resist film was formed on the metal conductive layer, and an antenna pattern with slits was formed using photolithography.
- the line width of the conductive portion 33 having the regular hexagonal mesh 35c is set to 10 ⁇ m, and the length of one side in one mesh 35c is set to Sb force 900 ⁇ m.
- a slit 32 having a width S of 500 m force was formed on the pattern 31 in the vertical direction.
- the transparent antenna formed in this manner was strong enough to make it impossible to visually recognize both the antenna pattern 31 and the slit 32 formed in the antenna pattern 31. As a result, a transparent antenna without degrading the design was obtained.
- a metal conductive layer was formed on a transparent glass plate having a thickness of 2 mm by laminating a copper foil having a thickness of 12 m, which had been subjected to a chemical treatment on both sides and thus subjected to a low reflection treatment.
- a resist film was formed on the metal conductive layer, and an antenna pattern with slits was formed by photolithography. This was subjected to chemical etching with a salty cupric solution, and the resist was peeled off to produce a transparent antenna as shown in FIG.
- the line width of the conductive portion 33 having the equilateral triangular mesh 35c is set to 18 m, and the length of one side in one mesh 35c is set to Sb force 700 ⁇ m.
- a slit 32 having a width S of 300 ⁇ m was formed on the upper side obliquely along the arrangement direction of the mesh 35c.
- both the antenna pattern 31 and the slit 32 were invisible. As a result, a transparent antenna that does not impair the design was obtained.
- a metal conductive layer was formed by bonding a copper foil with a thickness of 12 m, which had been subjected to low reflection chemical treatment on both sides.
- a resist film was formed on the metal conductive layer, and an antenna pattern with slits was formed by photolithography. This is chemically etched with a salty cupric solution to remove the resist. Separated, a transparent antenna as shown in FIG. 28 was produced.
- the line width of the conductive portion 33 having the square mesh 35c is 15 m.
- the length Sa of one side in one mesh 35c is set to lmm, and a slit 32 having a width S of lmm is formed on such an antenna pattern 31 in the vertical direction with respect to the mesh.
- both the antenna pattern 31 and the slit 32 were invisible. As a result, a transparent antenna that does not impair the design was obtained.
- a transparent antenna 40 shown in FIG. 32 has a rectangular antenna pattern 31, and a slit 32 is formed on the antenna pattern 31.
- the slit 32 has a slit start point 32a at the boundary between the lower edge 31a of the antenna pattern 31 and the tab 31b protruding from the lower edge 31a, and is centered along the outline of the antenna pattern 31.
- the antenna pattern 31 is formed in a spiral shape toward the end 32b of the slit 32.
- reference numeral 41 denotes an antenna terminal provided on the tab 31b.
- a transparent antenna 42 shown in FIG. 33 has a rectangular antenna pattern 31, and a slit 32 is formed on the antenna pattern 31.
- the same components as those in FIG. 32 are denoted by the same reference numerals and description thereof is omitted.
- a plurality of slits 32 are formed in parallel with the short side 31c of the antenna pattern 31.
- the slit 32c is slightly shorter than the short side 31c from the right edge of the antenna pattern 31.
- the slit 32d is formed with a length slightly shorter than the short side 31c from the left edge of the antenna pattern 31. In this manner, the slits 32c and the slits 32d are alternately arranged in the vertical direction to form the slits 32, whereby the antenna pattern 31 meandering in the vertical direction is formed.
- the transparent antenna 43 shown in FIG. 34 has a rectangular antenna pattern 31, and includes a slit 32e extending in the vertical direction from the horizontal center of the tab 31b, and a halfway force in the slit 32e. And a plurality of slits 32g, 32h formed in an oblique direction in parallel. It has.
- the slit 32g is cut from the lower edge of the antenna pattern 31 and has a predetermined length so as not to intersect with the slits 32e and 32f, whereas the slit 32h is cut from the slit 32e or 32f A predetermined length is formed so that the left edge of 31 does not reach 3 Id! As a result, an antenna pattern 31 meandering obliquely within the range surrounded by the slits 32e and 32f is formed.
- the transparent antenna 44 shown in FIG. 35 has a rectangular antenna pattern 31.
- the antenna pattern 31 includes a slit 32i in which the lateral central force of the tab 31b extends in the vertical direction by a predetermined length, and the slit 32i.
- a plurality of orthogonal slits 32j, 32j and a slit 32k cut into a predetermined length from the left edge 31d of the antenna pattern 31 and a slit cut into a predetermined length from the right edge 31e provided between the slits 32j, 32j. With 32m.
- antenna patterns 31 meandering are formed in the left half and the right half of the antenna pattern 31 with the slit 32i as a boundary.
- the transparent antenna 45 shown in FIG. 36 has a rectangular antenna pattern 31.
- the difference from the antenna pattern shown in FIG. 35 is that the slit 32 ⁇ provided in place of the slit 32i is above the antenna pattern 31. It is extended to edge 3 If! /.
- the antenna pattern 31 is divided into the left and right by the slit 32 ⁇ in this way, the two antenna patterns 31 and 31 constitute a transparent antenna arranged close to each other.
- the transparent antenna of the present invention can be attached to a window glass of an automobile, a bus, a truck or the like. It can also be attached to the cabin glass of construction machines such as hydraulic excavators and crawler cranes. Furthermore, it can be installed as a communication antenna on the glass of vehicles such as new transportation systems.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2006800175739A CN101180764B (zh) | 2005-04-01 | 2006-03-29 | 车辆用透明天线以及带天线的车辆用玻璃 |
KR1020077025224A KR101060424B1 (ko) | 2005-04-01 | 2006-03-29 | 차량용 투명 안테나 및 안테나 부착 차량용 유리 |
US11/887,161 US7656357B2 (en) | 2005-04-01 | 2006-03-29 | Transparent antenna for vehicle and vehicle glass with antenna |
EP06730463.4A EP1868261B1 (en) | 2005-04-01 | 2006-03-29 | Transparent antenna for vehicle and vehicle glass with antenna |
JP2007512807A JP4881858B2 (ja) | 2005-04-01 | 2006-03-29 | 車両用透明アンテナおよびアンテナ付き車両用ガラス |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
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JP2005106527 | 2005-04-01 | ||
JP2005-106527 | 2005-04-01 | ||
JP2005126895 | 2005-04-25 | ||
JP2005-126895 | 2005-04-25 | ||
JP2005-155120 | 2005-05-27 | ||
JP2005155120 | 2005-05-27 | ||
JP2005162002 | 2005-06-01 | ||
JP2005-162002 | 2005-06-01 |
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WO2006106759A1 true WO2006106759A1 (ja) | 2006-10-12 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2006/306515 WO2006106759A1 (ja) | 2005-04-01 | 2006-03-29 | 車両用透明アンテナおよびアンテナ付き車両用ガラス |
Country Status (7)
Country | Link |
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US (1) | US7656357B2 (ja) |
EP (1) | EP1868261B1 (ja) |
JP (1) | JP4881858B2 (ja) |
KR (1) | KR101060424B1 (ja) |
CN (1) | CN101180764B (ja) |
TW (1) | TW200642164A (ja) |
WO (1) | WO2006106759A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US7656357B2 (en) | 2010-02-02 |
TW200642164A (en) | 2006-12-01 |
CN101180764A (zh) | 2008-05-14 |
KR20080004556A (ko) | 2008-01-09 |
US20090140938A1 (en) | 2009-06-04 |
EP1868261A4 (en) | 2009-08-12 |
KR101060424B1 (ko) | 2011-08-29 |
EP1868261B1 (en) | 2016-07-20 |
JP4881858B2 (ja) | 2012-02-22 |
TWI380505B (ja) | 2012-12-21 |
CN101180764B (zh) | 2012-02-15 |
JPWO2006106759A1 (ja) | 2008-09-11 |
EP1868261A1 (en) | 2007-12-19 |
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