WO2011070801A1 - 導電性基板およびその製造方法ならびにタッチパネル - Google Patents
導電性基板およびその製造方法ならびにタッチパネル Download PDFInfo
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- WO2011070801A1 WO2011070801A1 PCT/JP2010/053917 JP2010053917W WO2011070801A1 WO 2011070801 A1 WO2011070801 A1 WO 2011070801A1 JP 2010053917 W JP2010053917 W JP 2010053917W WO 2011070801 A1 WO2011070801 A1 WO 2011070801A1
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- conductive
- transparent
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- conductive film
- layer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
Definitions
- the present invention relates to a conductive substrate used for a touch panel attached as an input device and a method for manufacturing the conductive substrate.
- a transparent touch panel is attached as an input device on the display of various electronic devices.
- the touch panel system include a resistance film type and a capacitance type.
- the capacitance type can be multi-touched and is widely used for mobile devices and the like.
- the capacitive touch panel has a transparent conductive film in which X-coordinate and Y-coordinate patterns are formed on the front and back surfaces of a substrate, respectively, connected to a circuit through a metal wiring pattern. It has a structure that can detect a voltage change between the membrane.
- a method for forming the pattern of the transparent conductive film there is a method by photolithography as in Patent Documents 1 to 3.
- an indium compound having a functional group or site that reacts with light and a tin compound having a similar functional group or site are used as the conductive film forming composition, and pattern exposure is performed.
- the metal wiring pattern is formed simultaneously with the pattern of the transparent conductive film as in Patent Document 1, or the transparent conductive film using a metal film such as Ag ink or Al as in Patent Document 5 or 6. It is formed by printing or the like on the top.
- JP-A-1-197911 Japanese Patent Laid-Open No. 2-109205 JP-A-2-309510 JP-A-9-142848 JP 2008-140130 A JP 2008-33777 A
- Patent Document 1 describes that a metal wiring pattern is formed at the same time as a transparent conductive film pattern, but the metal wiring pattern contains ITO used for the transparent conductive film, and is a rare resource indium. It becomes a problem in that a lot of must be used.
- the present invention has been made in view of the drawbacks of the prior art, and its object is to review the manufacturing process and to form a transparent conductive film pattern shape and a metal wiring pattern even in a conductive substrate where the pattern shape of the transparent conductive film is inconspicuous. It is to provide a conductive substrate having a high positional accuracy, a manufacturing method thereof, and a touch panel.
- the invention according to claim 1 is characterized in that a conductive layer and a transparent conductive film are provided in this order from the transparent substrate side on at least one surface of the transparent substrate. It is a substrate.
- the invention according to claim 2 is the conductive substrate according to claim 1, wherein the transparent conductive film has a conductive pattern region and a non-conductive pattern region.
- the invention according to claim 3 is the conductive substrate according to claim 2, wherein one or more optical adjustment layers are formed on the surface of the transparent conductive film.
- the invention according to claim 4 is characterized in that one or more optical adjustment layers are formed only on the surface of the conductive pattern region of the transparent conductive film. It is.
- a hard coat layer is formed between or on the outermost surface of at least one surface of the conductive substrate. is there.
- the invention according to claim 6 is characterized in that the sheet resistance value of the conductive layer is 1 ⁇ / ⁇ or less, and the sheet resistance value of the transparent conductive film is 100 ⁇ / ⁇ or more and 700 k ⁇ / ⁇ or less.
- the invention according to claim 7 is a touch panel using the conductive substrate according to claim 6.
- the invention according to claim 8 is the conductive laminate according to claim 2, which is bonded to another transparent substrate or another conductive substrate through an adhesive layer.
- the invention according to claim 9 is characterized in that the sheet resistance value of the conductive layer is 1 ⁇ / ⁇ or less, and the sheet resistance value of the transparent conductive film is 100 ⁇ / ⁇ or more and 700 k ⁇ / ⁇ or less.
- the invention according to claim 10 is a touch panel using the conductive substrate according to claim 9.
- An eleventh aspect of the invention includes a conductive substrate comprising a step of forming a conductive layer on at least one surface of a transparent substrate and a step of forming a transparent conductive film on the surface of the conductive layer in this order. It is a manufacturing method.
- the step of forming a transparent conductive film on the surface of the conductive layer is a step of forming a transparent conductive film having a conductive pattern region and a non-conductive pattern region on the surface of the conductive layer. It is a manufacturing method of the electroconductive board
- the invention described in claim 13 is the method for manufacturing a conductive substrate according to claim 12, further comprising a step of forming an optical adjustment layer and / or a step of forming a hard coat layer.
- the invention according to claim 14 is the method for producing a conductive substrate according to claim 13, wherein all steps are performed by a roll-to-roll method.
- the present invention it is possible to provide a conductive substrate, a manufacturing method thereof, and a touch panel, in which the transparent conductive film and the metal wiring can be easily aligned even in a conductive substrate in which the pattern shape of the transparent conductive film is inconspicuous.
- FIG. 1 is an explanatory view of a cross-sectional example 1 of the conductive substrate of the present invention.
- the conductive substrate 4 includes a conductive layer 2 provided on one side of the transparent substrate 1 and a transparent conductive film 3 having no pattern. Since the transparent conductive film 3 does not have a pattern, the conductive substrate 4 in FIG. 1 can be used as a conductive substrate of a resistive touch panel.
- FIG. 2 is an explanatory view of a cross-sectional example 2 of the conductive substrate of the present invention.
- the conductive substrate 4 includes a conductive layer 2 provided on one surface of the transparent substrate 1 and a transparent conductive film 3 in which a conductive pattern region 3a and a nonconductive pattern region 3b are formed. Since the transparent conductive film 3 has a pattern, the conductive substrate 4 in FIG. 2 can be used as a conductive substrate of a capacitive touch panel.
- the conductive pattern region refers to a portion having conductivity in the transparent conductive layer
- the non-conductive pattern region is a conductivity excluding a portion having conductivity in the transparent conductive layer. The part that does not have.
- the conductive substrate shown in FIGS. 3 to 10 can be cited in addition to FIG. 3 and 4 are explanatory views of cross-sectional examples 3 and 4 of the conductive substrate of the present invention, respectively.
- the optical adjustment layer 5 may be provided on the transparent conductive film 3 shown in FIG.
- the optical adjustment layer 5 may be provided only in the conductive pattern region 3 a of the transparent conductive film 3 depending on the configuration.
- FIG. 5 and 6 are explanatory views of cross-sectional examples 5 and 6 of the conductive substrate of the present invention, respectively.
- FIG. 5 by forming the hard coat layer 6 on at least one surface of the conductive substrate 4 shown in FIG. 2, the surface hardness is increased and the substrate is hardly damaged.
- the hard coat layer 6 is formed on the surface opposite to the side on which the conductive layer 2 is formed is shown.
- the conductive pattern region 3a and the nonconductive pattern are formed between the conductive layer 2 and the transparent substrate 1.
- the surface of the transparent conductive film 3 in which the region 3b is formed or the surface of the optical adjustment layer 5 as shown in FIG. 6 can be selected as appropriate.
- FIG. 7 to 9 are explanatory views of cross-sectional examples 7 to 9 of the conductive laminate of the present invention, respectively.
- Another transparent substrate 1 ′ is bonded to the hard coat layer 6 side of the conductive substrate 4 shown in FIG. 5 via the adhesive layer 8.
- the other transparent substrate 1 ′ to be bonded may constitute another conductive substrate 4 ′ having the same configuration as the conductive substrate 4 shown in FIG. 2.
- a conductive layer 2 and a transparent conductive film 3 in which a conductive pattern region 3a and a nonconductive pattern region 3b are formed are provided on one surface of another transparent substrate 1 ′.
- the surface of the transparent conductive film 3 of the other conductive substrate 4 ′ and the hard coat layer 6 of the conductive substrate 4 are bonded via the adhesive layer 8.
- another transparent substrate 1 ′ of another conductive substrate 4 ′ and the transparent substrate 1 of the conductive substrate 4 may be bonded via an adhesive layer 8.
- the pattern of the transparent conductive film 3 of the conductive substrate 4 and the pattern of the transparent conductive film 3 of the other conductive substrate 4 ′ are preferably patterns orthogonal to each other as will be described later. .
- FIG. 10 is an explanatory view of a cross-sectional example 10 of the conductive laminate of the present invention.
- You may provide the pattern of the transparent conductive film orthogonal to the pattern of the transparent conductive film 3 in the surface opposite to the surface in which the transparent conductive film 3 of the transparent substrate 1 of the conductive substrate 4 shown in FIG. 3 was provided. Also in the case of the opposite surface, it is preferable that the transparent conductive film 3 in which the transparent substrate 1, the conductive layer 2, the conductive pattern region 3a, and the non-conductive pattern region 3b are formed in this order.
- the shape of the transparent substrate 1 used in the present invention includes a plate shape and a film shape.
- a polymer resin is used in addition to glass.
- the polymer resin is not particularly limited as long as it has sufficient strength in the film-forming step and the subsequent step and has good surface smoothness.
- polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyether Examples include sulfone, polysulfone, polyarylate, cyclic polyolefin, and polyimide.
- the thickness is about 10 ⁇ m or more and 200 ⁇ m or less in consideration of the thinning of the member and the flexibility of the substrate.
- the transparent substrate 1 As a material contained in the transparent substrate 1, in addition to the above materials, various additives and stabilizers well-known on the surface of the base material, such as an antistatic agent, an anti-ultraviolet agent, a plasticizer, a lubricant, an easy adhesive, and the like May be used.
- pretreatment may be performed by corona treatment, low temperature plasma treatment, ion bombardment treatment, chemical treatment, or the like.
- the conductive layer 2 used in the present invention is a metal wiring pattern connected to a circuit capable of detecting a voltage change, and is formed so as to be in contact with the conductive pattern region 3a of the transparent conductive film 3. Since the conductive pattern region 3 a of the transparent conductive film 3 is transparent and is often a fine pattern for accurately reading position information, the conductive layer 2 is formed of the conductive pattern region 3 a of the transparent conductive film 3. It is necessary to accurately align and form.
- Examples of the conductive layer 2 include those obtained by patterning a metal film by a method such as photolithography or laser, and those obtained by patterning silver ink, carbon nanotube (CNT), conductive resin, or the like by screen printing or ink jet printing.
- any method may be used as long as it is a material and a forming technique that can form a thin line of about 100 ⁇ m or less and can obtain sufficient conductivity even if the line is thinned.
- the conductive layer 2 is preferably provided in the order of the conductive layer 2 and the transparent conductive film 3 from the transparent substrate 1 side.
- the transparent conductive film 3 By providing the transparent conductive film 3 after the conductive layer 2 is provided, the conductive layer 2 and the transparent conductive layer 3 can be easily aligned.
- the pattern of the transparent conductive film 3 is transparent and has a fine structure. It is difficult to accurately adjust the position to the position, and this is not preferable.
- the position adjustment with the transparent conductive film pattern is further facilitated.
- heat and ultraviolet rays are appropriately used for drying and curing.
- the sheet resistance of the conductive layer 2 is preferably 1 ⁇ / ⁇ or less. By setting it within this range, sufficient conductivity can be obtained even if the wire is thinned.
- the sheet resistance can be measured by the four-end needle method or can be calculated from the pattern shape and its resistance value. .
- the hard coat layer 6 used in the present invention is provided to give the conductive substrate 4 mechanical strength.
- resin used Resin which has transparency, moderate hardness, and mechanical strength is preferable.
- a photocurable resin such as a monomer or a crosslinkable oligomer having a tri- or higher functional acrylate that can be expected to be three-dimensionally crosslinked as a main component is preferable.
- Trifunctional or higher acrylate monomers include trimethylolpropane triacrylate, isocyanuric acid EO-modified triacrylate, pentaerythritol triacrylate, dipentaerythritol triacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate Ditrimethylolpropane tetraacrylate, pentaerythritol tetraacrylate, polyester acrylate and the like are preferable.
- Particularly preferred are isocyanuric acid EO-modified triacrylates and polyester acrylates. These may be used alone or in combination of two or more.
- so-called acrylic resins such as epoxy acrylate, urethane acrylate and polyol acrylate can be used in combination.
- acrylic oligomers such as polyester (meth) acrylate, polyether (meth) acrylate, polyurethane (meth) acrylate, epoxy (meth) acrylate, and silicone (meth) acrylate are preferable.
- Specific examples include polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, bisphenol A type epoxy acrylate, polyurethane diacrylate, cresol novolac type epoxy (meth) acrylate, and the like.
- the hard coat layer 6 may contain additives such as other particles and a photopolymerization initiator.
- the particles to be added include organic or inorganic particles, but it is preferable to use organic particles in consideration of transparency.
- organic particles include particles made of acrylic resin, polystyrene resin, polyester resin, polyolefin resin, polyamide resin, polycarbonate resin, polyurethane resin, silicone resin, and fluorine resin.
- the average particle diameter of the particles varies depending on the thickness of the hard coat layer 6, but for the reason of appearance such as haze, the lower limit is 2 ⁇ m or more, more preferably 5 ⁇ m or more, and the upper limit is 30 ⁇ m or less, preferably 15 ⁇ m or less. use. Further, for the same reason, the particle content is preferably 0.5% by weight or more and 5% by weight or less based on the resin.
- radical generating photopolymerization initiators include benzoin and its alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzyl methyl ketal, acetophenone, 2, 2 , -Dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone, and other acetophenones, methylanthraquinone, 2-ethylanthraquinone, 2-amylanthraquinone and other anthraquinones, thioxanthone, 2,4-diethylthioxanthone, 2, 4 -Thioxanthones such as diisopropylthioxanthone, ketals such as acetophenone dimethyl ketal and benzyl dimethyl ketal, benzophenone, 4, 4-
- tertiary amines such as triethanolamine and methyldiethanolamine
- benzoic acid derivatives such as 2-dimethylaminoethylbenzoic acid, ethyl 4-dimethylaminobenzoate, etc. It can be used in combination with a photoinitiator aid or the like.
- the addition amount of the photopolymerization initiator is 0.1% by weight or more and 5% by weight or less, preferably 0.5% by weight or more and 3% by weight or less with respect to the main component resin. Less than the lower limit is not preferable because the hard coat layer is insufficiently cured. Moreover, when exceeding an upper limit, since yellowing of a hard-coat layer will be produced or a weather resistance will fall, it is unpreferable.
- the light used for curing the photocurable resin is ultraviolet rays, electron beams, or gamma rays, and in the case of electron beams or gamma rays, it is not always necessary to contain a photopolymerization initiator or a photoinitiating aid. As these radiation sources, high-pressure mercury lamps, xenon lamps, metal halide lamps, accelerated electrons, and the like can be used.
- the thickness of the hard coat layer 6 is not particularly limited, but is preferably in the range of 0.5 ⁇ m to 15 ⁇ m. Moreover, it is more preferable that the refractive index is equal to or close to that of the transparent substrate layer 11, and it is preferably about 1.45 or more and 1.75 or less.
- the hard coat layer 6 is formed by dissolving a resin that is a main component and a material that absorbs ultraviolet rays in a solvent, a die coater, curtain flow coater, roll coater, reverse roll coater, gravure coater, knife coater, bar coater, spin It forms with well-known coating methods, such as a coater and a micro gravure coater.
- the solvent is not particularly limited as long as it dissolves the main component resin. Specifically, ethanol, isopropyl alcohol, isobutyl alcohol, benzene, toluene, xylene, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, n-butyl acetate, isoamyl acetate, ethyl lactate, methyl cellosolve, ethyl cellosolve, Examples include butyl cellosolve, methyl cellosolve acetate, and propylene glycol monomethyl ether acetate. These solvents may be used alone or in combination of two or more.
- the optical adjustment layer 5 has a function of making the pattern formed on the transparent conductive film 3 inconspicuous and is a layer for improving visibility.
- materials such as oxides, sulfides, fluorides, and nitrides can be used.
- the thin film made of the inorganic compound has a different refractive index depending on the material, and the optical characteristics can be adjusted by forming a thin film having a different refractive index with a specific film thickness.
- the number of optical functional layers may be a plurality of layers depending on the target optical characteristics.
- Low refractive index materials include magnesium oxide (1.6), silicon dioxide (1.5), magnesium fluoride (1.4), calcium fluoride (1.3 to 1.4), cerium fluoride ( 1.6), aluminum fluoride (1.3), and the like.
- titanium oxide (2.4), zirconium oxide (2.4), zinc sulfide (2.3), tantalum oxide (2.1), zinc oxide (2.1) examples include indium oxide (2.0), niobium oxide (2.3), and tantalum oxide (2.2).
- the numerical value in the parenthesis represents the refractive index.
- the same resin as the hard coat layer 6 may be used as the optical adjustment layer 5.
- high refractive index inorganic fine particles such as zirconium oxide and titanium oxide can be dispersed in the resin to increase the refractive index of the resin.
- the transparent conductive film 3 examples include indium oxide, zinc oxide, and tin oxide, or two or three kinds of mixed oxides thereof, and those added with other additives. -Various materials can be used depending on the application, and are not particularly limited. At present, the most reliable and proven material is indium tin oxide (ITO).
- ITO indium tin oxide
- the content ratio of tin oxide doped in indium oxide is selected according to the specifications required for the device. To do.
- the base material is a plastic film
- the sputtering target material used to crystallize the thin film for the purpose of increasing the mechanical strength desirably has a tin oxide content of less than 10% by weight.
- the content ratio of tin oxide is preferably 10% by weight or more.
- the content ratio of tin oxide is desirably in the range of 3 wt% to 20 wt%.
- the sheet resistance of the transparent conductive film 3 is preferably 100 ⁇ / ⁇ or more and 700k ⁇ / ⁇ or less. By setting it as this range, it is excellent in durability and permeability, and the contact position can be detected with high accuracy.
- the sheet resistance can be measured by the four-end needle method as in the conductive layer 2, or can be calculated from the pattern shape and its resistance value.
- any film forming method may be used as long as the film thickness can be controlled.
- the dry method is excellent for forming a thin film.
- a vacuum vapor deposition method a physical vapor deposition method such as sputtering, or a chemical vapor deposition method such as a CVD method can be used.
- a sputtering method in which the process is stable and the thin film becomes dense is desirable.
- the transparent conductive film 3 is patterned as shown in FIG. As shown in FIG. 11 or FIG. 12, the pattern to be formed includes a conductive pattern region 3a represented in black and a non-conductive pattern region 3b represented in white.
- the conductive pattern region 3a is in contact with the conductive layer 2 and is connected to a circuit capable of detecting a voltage change.
- the conductive pattern region 3a which is a detection electrode
- the overall capacitance changes, so that the circuit voltage changes, and the contact position can be determined.
- Two-dimensional positional information can be obtained by pasting the patterns of FIG. 11 or FIG. 12, combining them so as to be orthogonal to each other as shown in FIG. 13, and connecting them to the voltage change detection circuit.
- the transparent conductive film 3 preferably has a total light transmittance difference of 1% or less between the conductive pattern region 3a and the non-conductive pattern region 3b of the transparent conductive film 3. Even if different patterns are formed on both surfaces of the conductive substrate, the pattern shape becomes inconspicuous and visibility is improved. Furthermore, it is preferable that the transmission hue b * difference between the conductive pattern region and the non-conductive pattern region is 1.5 or less. When it is in this range, the pattern shape becomes less conspicuous and the visibility is further improved.
- the pattern shape of the transparent conductive film 3 includes a mesh type pattern in addition to the diamond type pattern as shown in FIG. 11 or FIG. 12, and is as fine as possible in order to accurately read the two-dimensional position information. In addition, it is necessary to accurately align the two patterns.
- a pattern formation method for the transparent conductive film 3 As a pattern formation method for the transparent conductive film 3, a resist is applied on the transparent conductive film 3, a pattern is formed by exposure and development, and then the transparent conductive film is chemically dissolved, or a chemical reaction in vacuum.
- the pattern forming method can be appropriately selected depending on the shape, accuracy, etc. of the pattern, but in consideration of pattern accuracy and thinning, a photolithography method is preferable.
- FIG. 14 shows a pattern forming process of the conductive substrate 4 of the present invention, taking the conductive substrate 4 shown in FIG. 5 as an example.
- the transparent substrate 1 is prepared (step (a)), and the hard coat layer 6 is formed on one surface (step (b)).
- the conductive layer 2 is formed at a predetermined position on the surface of the transparent substrate 1 opposite to the hard coat layer 6 (step (c)).
- a transparent conductive film 3 is formed (step (d)).
- a resist 7a is applied to the surfaces of the conductive layer 2 and the transparent conductive film 3 (step (e)), a light source for forming a pattern on the transparent conductive film 3, and a pattern mask represented by FIG. 11 or FIG.
- the transparent substrate coated with the resist 7a is arranged in order, and is exposed with light from the light source to form regions of the resists 7b and 7c (step (f)).
- Reference numeral 7c denotes a resist exposed to light.
- the resist 7b which is not exposed is removed with a developing solution (step (g)), and the exposed portion of the transparent conductive film 3 is etched (step (h)).
- the exposed resist 7c is peeled off to obtain the conductive substrate 4 (step (i)).
- the method for producing the conductive substrate 4 of the present invention preferably includes the step (c) of forming the conductive layer 2 and the step (d) of forming the transparent conductive film 3 in this order. Since the pattern of the transparent conductive film 3 can be formed on the basis of the position of the conductive layer 2 by forming the conductive layer 2 first, and then forming the pattern by forming the transparent conductive film 3, it is easy to Alignment can be performed. Conversely, when the conductive layer 2 is formed after forming the pattern by forming the transparent conductive film 3, the conductive layer 2 is formed in accordance with the position of the pattern of the transparent conductive film 3 that is transparent and fine. Must be performed, and alignment cannot be performed easily.
- the sheet of the transparent conductive film 3 formed in advance is used to dry the silver ink forming the conductive layer 2 at a high temperature.
- the resistance value increases, and the contact position cannot be detected with high accuracy.
- step (c) of forming the conductive layer 2 it is more preferable to form a marker for alignment at the same time as forming the conductive layer 2. Thereby, when forming the pattern of the transparent conductive film 3 after that, a pattern can be formed using the marker for alignment as a mark.
- FIG. 14 is a diagram showing each step of a method for forming a pattern using a negative resist, but a pattern may be formed using a positive resist.
- the conductive substrate 4 of the present invention shown in other drawings can also form the conductive pattern region 3a and the non-conductive pattern region 3b of the transparent conductive film 3 by the above-described steps.
- the method for manufacturing the conductive substrate 4 of the present invention may include a step of bonding another transparent substrate 1 'to the transparent substrate 1 of the conductive substrate 4 obtained by the step shown in FIG. Further, using the conductive substrate 4 ′ obtained by another process, the surface of the transparent conductive film 3 of the other conductive substrate 4 ′ and the hard coat layer 6 of the conductive substrate 4 are interposed via the adhesive layer 8. The process to paste may be included.
- the step of forming the conductive layer 2, the step of forming the transparent conductive film 3, or the transparent conductive film 3 having the conductive pattern region 3a and the non-conductive pattern region 3b is formed.
- the step, the step of forming the optical adjustment layer 5 and the step of forming the hard coat layer 6 are preferably performed by a roll-to-roll method.
- the conductive substrate 4 can be efficiently produced in large quantities. In particular, it is more preferable to perform each process continuously by a roll-to-roll method.
- Example 1 A polyethylene terephthalate film (manufactured by Toray Industries Inc., thickness: 100 ⁇ m) is used as a transparent substrate, and a coating solution for forming a resin layer having the following composition is applied to one surface with a microgravure coater, dried at 60 ° C. for 1 minute, and irradiated with ultraviolet rays. A hard coat layer was formed by curing.
- composition of resin layer forming coating solution Resin: Purple light UV-7605B (manufactured by Nippon Synthetic Chemical) 100 parts by weight Initiator: Irgacure 184 (manufactured by Ciba Japan) 4 parts by weight Solvent: 100 parts by weight of methyl acetate
- a conductive layer and an alignment marker were formed on a surface of the transparent substrate opposite to the hard coat layer using silver ink by a screen printer, and dried at 150 ° C. for 30 minutes.
- an ITO film having a thickness of 25 nm was formed as a transparent conductive film on the conductive layer by sputtering, and then a pattern of the transparent conductive film was formed by photolithography based on the silver ink alignment marker.
- Example 1 In the case of Example 1, a transparent conductive film with few scratches could be formed by applying a hard coat. Moreover, since the alignment was easy, there was no defect due to pattern shift. The sheet resistance value of the ITO film was stable at 200 ⁇ / ⁇ .
- Example 2 A polyethylene terephthalate film (manufactured by Toray Industries, Inc., thickness: 100 ⁇ m) is used as a transparent substrate. The same conductive layer as 1 and an alignment marker were formed. Next, the same ITO film as in Example 1 was formed to a thickness of 25 nm, and then the SiO 2 film was formed to a thickness of 70 nm as an optical adjustment layer. Then, using the silver ink alignment marker as a reference, SiO 2 and ITO were formed by photolithography. Were etched with the same pattern to obtain a conductive substrate.
- Example 2 a transparent conductive film with few scratches could be formed by applying a hard coat. Moreover, since the alignment was easy, there was no defect due to pattern shift.
- the sheet resistance value of the ITO film is stable at 200 ⁇ / ⁇ , and the difference in total light transmittance between the conductive pattern region and the non-conductive pattern region is 0.3% in terms of optical characteristics. A conductive substrate was obtained.
- a polyethylene terephthalate film (manufactured by Toray Industries, Inc., thickness: 100 ⁇ m) is used as a transparent substrate, a hard coat layer similar to that of Example 1 is formed on one surface, and a sputtering method is applied to the opposite surface of the transparent substrate to the hard coat layer.
- 10 nm of TiO 2 as the optical adjustment layer 56 nm of SiO 2 and 25 nm of ITO film as the transparent conductive film were formed.
- a conductive pattern region, a non-conductive pattern region, and an alignment marker are formed on the ITO film by a photolithography method, and finally a conductive layer is formed by a screen printer using silver ink. It was dried for a minute to obtain a conductive substrate.
- the total light transmittance difference between the conductive pattern region and the non-conductive pattern region was 0.7%, and a conductive substrate in which the pattern was difficult to visually recognize was obtained.
- the alignment marker provided the conductive layer. The screen printing process could not be read, and alignment defects occurred frequently. It was also confirmed that the sheet resistance value of the ITO film, which was 200 ⁇ / ⁇ after film formation, increased to 800 ⁇ / ⁇ due to the high temperature in the silver ink drying process.
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Abstract
Description
透明基板としてポリエチレンテレフタレートフィルム(東レ社製、厚み:100μm)を用い、一方の面に、下記組成の樹脂層形成用塗液をマイクログラビアコーターで塗布し、60℃で1分間乾燥させ、紫外線により硬化させることで、ハードコート層を形成した。
樹脂 : 紫光 UV-7605B(日本合成化学社製) 100重量部
開始剤 : イルガキュア184(チバ・ジャパン社製) 4重量部
溶剤 : 酢酸メチル 100重量部
透明基板としてポリエチレンテレフタレートフィルム(東レ社製、厚み:100μm)を用い、一方の面に、実施例1と同様のハードコート層を形成し、透明基板のハードコート層とは反対面に、実施例1と同様の導電層および位置合わせ用マーカーを形成した。次に、実施例1と同様のITO膜を25nm成膜後、光学調整層として、SiO2を70nm成膜した後、銀インキの位置合わせ用マーカーを基準に、フォトリソグラフィ法によりSiO2およびITOを同じパターンでエッチングし、導電性基板を得た。
透明基板としてポリエチレンテレフタレートフィルム(東レ社製、厚み:100μm)を用い、一方の面に、実施例1と同様のハードコート層を形成し、透明基板のハードコート層とは反対面に、スパッタリング法により光学調整層としてTiO2を10nm、SiO2を56nm、透明導電膜としてITO膜を25nmそれぞれ成膜した。次に、フォトリソグラフィ法により、ITO膜に導電性パターン領域、非導電性パターン領域および位置合わせ用マーカーを形成し、最後に銀インクを用いてスクリーン印刷機により導電層を形成し、150℃30分間乾燥させ、導電性基板を得た。
1’…他の透明基板
2…導電層
3…透明導電膜
3a…導電性パターン領域
3b…非導電性パターン領域
4…導電性基板
4’…他の導電性基板
5…光学調整層
6…ハードコート層
7a、7b…レジスト
7c…感光したレジスト
8…粘着層
Claims (14)
- 透明基板の少なくとも片面に、導電層と、透明導電膜とを前記透明基板側からこの順序で備えることを特徴とする導電性基板。
- 前記透明導電膜が導電性パターン領域及び非導電性パターン領域を有することを特徴とする請求項1に記載の導電性基板。
- 前記透明導電膜の表面に1又は2層以上の光学調整層が形成されていることを特徴とする請求項2に記載の導電性基板。
- 前記透明導電膜の導電性パターン領域の表面のみに1又は2層以上の光学調整層が形成されていることを特徴とする請求項2に記載の導電性基板。
- 前記導電性基板の少なくとも片面の何れかの層の間又は最表面にハードコート層が形成されていることを特徴とする請求項3に記載の導電性基板。
- 前記導電層のシート抵抗の値が1Ω/□以下であり、前記透明導電膜のシート抵抗の値が100Ω/□以上700kΩ/□以下であることを特徴とする請求項5に記載の導電性基板。
- 請求項6に記載の導電性基板を用いたタッチパネル。
- 粘着層を介して、他の透明基板又は他の導電性基板に貼合されていることを特徴とする請求項2に記載の導電性積層体。
- 前記導電層のシート抵抗の値が1Ω/□以下であり、前記透明導電膜のシート抵抗の値が100Ω/□以上700kΩ/□以下であることを特徴とする請求項8に記載の導電性基板。
- 請求項9に記載の導電性基板を用いたタッチパネル。
- 透明基板の少なくとも片面に、導電層を形成する工程と、
前記導電層の表面に透明導電膜を形成する工程と
をこの順に備えることを特徴とする導電性基板の製造方法。 - 前記導電層の表面に透明導電膜を形成する工程が、前記導電層の表面に導電性パターン領域および非導電性パターン領域を有する透明導電膜を形成する工程であることを特徴とする請求項11に記載の導電性基板の製造方法。
- さらに、光学調整層を形成する工程及び/又はハードコート層を形成する工程を含むことを特徴とする請求項12に記載の導電性基板の製造方法。
- 全ての工程をロールトゥロール方式により行うことを特徴とする請求項13に記載の導電性基板の製造方法。
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JP2011501835A JP4780254B2 (ja) | 2009-12-10 | 2010-03-09 | 導電性基板およびその製造方法ならびにタッチパネル |
CN201080055742.4A CN102652340B (zh) | 2009-12-10 | 2010-03-09 | 导电性基板及其制造方法、导电性叠层体以及触摸面板 |
US13/490,112 US20120241199A1 (en) | 2009-12-10 | 2012-06-06 | Conductive substrate, method of manufacturing the same and touch panel |
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US13/490,112 Continuation US20120241199A1 (en) | 2009-12-10 | 2012-06-06 | Conductive substrate, method of manufacturing the same and touch panel |
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US (1) | US20120241199A1 (ja) |
JP (2) | JP4780254B2 (ja) |
KR (1) | KR101641402B1 (ja) |
CN (1) | CN102652340B (ja) |
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KR101641402B1 (ko) | 2016-07-20 |
TWI499829B (zh) | 2015-09-11 |
US20120241199A1 (en) | 2012-09-27 |
TW201120519A (en) | 2011-06-16 |
JP4888608B2 (ja) | 2012-02-29 |
KR20120114260A (ko) | 2012-10-16 |
CN102652340B (zh) | 2014-07-16 |
CN102652340A (zh) | 2012-08-29 |
JPWO2011070801A1 (ja) | 2013-04-22 |
JP2011253546A (ja) | 2011-12-15 |
JP4780254B2 (ja) | 2011-09-28 |
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