JP2014029614A - Film-shaped capacitive touch panel and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rational layer structure on a film base material when a touch panel having a mesh structure composed of plural functional optical films and thin metal wires is mounted on a display device.SOLUTION: A film-shaped capacitive touch panel includes: a capacitive touch panel 10 having a mesh structure of thin metal wires and disposed on one surface of a film base material 5; and functional optical films disposed on any or both of the surfaces. The functional optical films are an antireflection film 20 or a polarizing film 30.

Description

  The present invention relates to a technique for combining a film-like capacitive touch panel using a metal wiring mesh structure as a sensor with another functional optical film such as a polarizing film.

  2. Description of the Related Art In recent years, touch panel type input devices (hereinafter simply referred to as touch panels) have been adopted for operation units of various electronic devices such as mobile phones, portable information terminals, and car navigation systems. The touch panel is used as an input device that detects a contact position of a fingertip or a pen tip on a display surface of a display panel such as a liquid crystal display device or an organic EL device. There are various types of touch panels, such as a resistance film type and a capacitance type, depending on the structure and detection method.

  There are two types of capacitive touch panels: surface type and projection type. Both methods detect the position by capturing the change in capacitance between the fingertip and the conductive film. Since electrostatic coupling occurs just by moving the finger close to the sensor surface, it is possible to display a cursor before contact. The object to be pressed needs to be a finger or an electrostatically conductive material equivalent to that of the finger, but the alternating current that flows in accordance with the change in the capacitance does not depend on the impedance of the contact medium.

  In particular, the projected capacitive method can detect multiple points of the fingertip. In general, the projection type has a configuration in which a support substrate on which an electrode layer and a control IC are mounted is covered with a protective insulating resin. Although the details of the electrode layer are omitted, on the support substrate such as glass or plastic, a large number of mosaic electrodes composed of one set of X and Y direction electrodes are formed on a support substrate such as glass or plastic using a transparent electrode material (ITO). Yes. The X direction electrode and the Y direction electrode are all laid while maintaining insulation (Patent Documents 1 and 2).

  Further, as shown in FIG. 1, stripe-shaped metal wirings 2 extending in the vertical direction and metal wirings 3 extending in the horizontal direction may be laid on the substrate while maintaining insulation (Patent Documents 3 and 4). Metal wiring is more advantageous because it has lower sensitivity than ITO, but metal is light-shielding and reflective, so unlike ITO, wiring density and aperture ratio are problematic. Whether the ITO array or the metal array is touched or approached, the change in the capacitance of the nearby electrode can be known from one set of vertical and horizontal electrode rows, so that the contact position can be specified with a high degree of accuracy, apart from the resolution.

  Many points can be detected by a large number of electrode rows running vertically and horizontally. However, since the number of terminals is large, the wiring is thin and the resistance of the ITO wiring is too high. Therefore, in a large-sized touch panel, in order to connect an FPC on which an IC for position detection is mounted and a sensor substrate, a wiring with a large line width is provided around the substrate. There is a tendency for the cost to increase, for example, it is necessary to have a three-layer structure of molybdenum / aluminum / molybdenum or silver paste.

  Therefore, as a touch panel for a large display with a diagonal of 30 inches or more, the metal wiring type from the beginning has lower resistance, and it is also practical to lay a thin metal wire on the film at a low cost. Can be said to be expensive. As shown in FIG. 2, the method of laying fine metal wires on the film is laid so that the stripe-like fine metal wires are perpendicular to each other (FIG. 2A) and perpendicular to one side. There is a form (FIG. 2B). As for the former, it is also possible to obtain a film in which striped fine metal wires are laid on one side and bonded back to back or back to back.

By the way, the liquid crystal display device includes a polarizing film,
Various functional optical members such as an antireflection film and a retardation film are necessary, and these also need to be mounted on the display surface at the same time. An organic EL display device does not require a polarizing plate, but requires an antireflection film.

  The structure of the antireflection film 20 is shown in FIG. 3A, and is a laminated structure of the film base 5 / hard coat layer 13 / antireflection layer 11 (Patent Document 5). The antireflection layer 11 can obtain antireflection performance by using a material having a refractive index lower than that of the hard coat layer 13. An antistatic layer 12 may be placed between the hard coat layer 13 and the antireflection layer 11. Although the structure of the polarizing film 30 is shown in FIG. 3B, the polarizing layer 14 is sandwiched between the film substrates 5 and 5 '. The polarizing layer itself is obtained by dispersing iodine molecules in a stretched PVA film resin.

  In any case, one TAC film in the range of 40 to 80 μm is used as the film base material for the antireflection film 20 and two for the polarizing film (plate) 30. If the touch panel 10 is composed of one film base material, when these are stacked, at least four film base materials are stacked. When multiple films are stacked, the thickness is increased by that amount, and an optical adhesive is required, causing problems such as contamination of foreign matters and bubbles in the lamination process, resulting in reduced productivity. is there.

JP 2012-01462 A JP 2012-004042 A JP 2011-253263 A JP 2011-248722 A JP 2011-164457 A

  This invention is made | formed in view of the said situation, and provides the rational layer structure on a film base material when mounting the touchscreen which consists of a mesh structure of a some functional optical member and a metal fine wire in a display apparatus. That is.

  The invention according to claim 1 for achieving the above object includes a capacitive touch panel having a mesh structure of fine metal wires on one surface of a film substrate, and further a functional optical film on one or both surfaces. It is set as the film-like electrostatic capacitance type touch panel characterized by having provided.

  The invention according to claim 2 is provided with a stripe-shaped fine metal wire on one surface of the film substrate, a stripe-shaped fine metal wire orthogonal to the stripe-like fine wire on the other surface, and either one or both surfaces The film-type capacitive touch panel is provided with a functional optical film.

  The invention according to claim 3 is characterized in that the functional optical film is an antireflection film, and a hard coat layer and an antireflection layer are laminated in this order. It is a film-like capacitive touch panel.

The invention according to claim 4 is characterized in that the functional optical film is a polarizing film, and a polarizing layer and a protective layer are laminated in this order. This is a capacitive touch panel.

  The invention according to claim 5 is a polarizing film in which the functional optical film has an antireflection function, wherein a polarizing layer, a protective layer, a hard coat layer, and an antireflection layer are laminated in this order. The film-like capacitive touch panel according to claim 1 or 2 is used.

  The invention according to claim 6 is the film-like capacitive touch panel according to claim 3 or 5, wherein an antistatic layer is provided under the antireflection layer.

The invention according to claim 7 is a step of forming a copper foil layer on any surface of the film base material that supports the functional optical film on one surface;
Forming a striped copper wiring from a copper foil layer by a photolithography method;
Forming an insulating layer on the copper wiring;
Forming a copper foil layer;
Forming a striped copper wiring from a copper foil layer on an insulating layer by a photolithographic method.

  The invention according to claim 8 is characterized in that a functional optical film is laminated on either or both surfaces of a film substrate provided with striped copper fine wires orthogonal to each other on the front and back of the film substrate. The manufacturing method of the film-like capacitive touch panel to be performed is as follows.

  The invention according to claim 9 is characterized in that the functional optical film is an antireflection film and / or a polarizing film, and the method for producing a film-like capacitive touch panel according to claim 7 or 8. It is what.

  The invention according to claim 10 is characterized in that the copper foil layer is either an electrolytic copper foil or a vapor-deposited copper foil. The method for producing a film-like capacitive touch panel according to claim 7 or 9, It is what.

  In the first and seventh aspects of the present invention, the thin metal wire and the functional optical member, which are sensors for the touch panel, are supported on separate film bases, respectively, and the touch panel and the functional optics are made common to the film base. The members are arranged on the front and back sides. By using a common film base, the overall thickness and weight can be reduced, and the cost of the member can be expected to be reduced.

  The invention described in claim 2 and claim 8 is provided with functional optics directly on the stripe electrode disposed on one surface of the film substrate. The difference from claim 1 is that a touch panel is formed. That is, the thin metal wire is also laid on the functional optical film side. Even in this configuration, the film base is used in common, and as a whole, a reduction in thickness and weight is achieved, and a reduction in member costs can be expected.

  The inventions of claims 3 and 4 specify an antireflection film and a polarizing film as the functional optical film.

  The invention according to claim 5 is a laminate in which an antireflection film is further laminated on the upper layer of the polarizing film, and the number of film base materials is further reduced, and the overall reduction in thickness and weight is achieved, thereby reducing the member cost. Can be expected.

According to invention of Claim 6, there exists an effect that electrification is prevented by laying an antistatic layer. Furthermore, there is room for adjusting the refractive index of the antistatic layer, and an improvement in the performance of the antireflection function can be expected.

It is a figure of the top view explaining the metal fine wire arrangement | positioning (mesh structure) of the touchscreen which uses a metal fine wire (wiring). It is a figure of the cross-sectional view explaining the position of the striped metal fine wire in a touch panel. (A) When using both sides of a film substrate, (b) When providing a mesh structure on one side. It is a figure of the cross-sectional view explaining the structure of a functional optical member. (A) Antireflection film, (b) Polarizing film (plate), (c) An example in which an antireflective film and a polarizing film are combined to share a film substrate. It is a figure of the cross-sectional view at the time of uniting a touch panel and a functional back member. (A) Touch panel / antireflection film, (b) Touch panel / polarization film, (c) Touch panel / polarization film / antireflection film, (d) Polarization film / touch panel / antireflection film, all of which have fine metal wires on both sides It is the touch panel which has. It is process drawing of the cross sectional view explaining an example of the manufacturing method of a film-like touch panel.

  Hereinafter, embodiments of the touch panel according to the present invention will be described with reference to the drawings.

  The metal wiring pattern of the touch panel 10 according to the present invention is shown in FIG. 1 in a top view, and the structure is shown in FIGS. 2A and 2B in a sectional view. FIG. 2 (a) shows that the striped copper wirings 2 and 3 having the same pitch are arranged on the front and back surfaces of the film substrate 5 so as to be orthogonal to each other. FIG. 2 (b) is orthogonal on the same surface. It is laid to do. In any of the top views, the opening 4 forms a substantially square mesh structure 1, the solid line corresponds to the striped metal wiring 3 on the front surface, and the double line corresponds to the metal wiring 2 on the back surface. The mesh structure 1 does not necessarily have a square opening, and may have a rectangular shape with a different pitch or a parallelogram.

  In the structure of FIG. 2A, since the insulating film base 5 is between the metal wiring 2 and the metal wiring 3, the upper and lower metal wirings 2 and 3 are naturally insulated. In FIG. 2B, it is necessary to form an insulating resin film 8 locally by photolithography or the like where the striped metal thin wires intersect to obtain insulation. Two sets of film base materials each having a striped electrode on one surface may be prepared and bonded back to back or back to back.

  Since the metal wiring has a light-shielding property, if the line width d is increased, the aperture ratio is decreased and the transmittance is decreased. If the stripe pitch p is increased, the resolution as the position sensor is decreased. Therefore, the line width d and the pitch p are decreased. Is set to an appropriate value. As the metal material, aluminum or copper is preferable, but copper is most preferable in terms of resistance and cost.

  A touch panel is a grounding device when an electrostatic and conductive medium such as a finger or hand is brought close to a conductor when alternating current with the same phase and voltage is applied to both ends of the conductor such as metal wiring. This is an electronic device that utilizes the phenomenon that capacitive coupling occurs between a medium that is considered to be conductive and a conductor (which is also grounded) and an excessive alternating current flows through the conductor.

  Therefore, it is not necessary for the finger to touch the conductor directly, and the conductor may be in contact with or in close proximity via a dielectric such as a film. Since the conductor is soiled when the hand touches the conductor of the sensor portion, it is usually necessary to coat the conductor with an antifouling transparent protective material. Further, the conductor (hereinafter also referred to as an electrode) does not necessarily exist on the same plane, and may be disposed between the insulating resin 5 and the like as shown in FIG. However, since the substantial distance to the contact medium (for example, the finger) changes, there is a possibility that the sensitivity changes depending on whether the sensitivity is above or below the insulating resin 5.

  In principle, it is possible to detect which electrode material is close to which side by simply placing the electrode material appropriately, but in order to maintain accuracy as a position sensor, linear electrodes are arranged in an XY matrix. Thus, the position is calculated from the intersection by independently detecting which X-direction electrode and which Y-direction electrode, not where on which electrode. Of course, all of the electrodes 2 in the X direction and the electrode 3 in the Y direction need to be insulated. Moreover, the electrodes 2 and 3 do not necessarily need to be linear. In the case of a light-shielding metal wiring, fine lines that are difficult to see within the range allowed by the transmittance are arranged as tightly as possible.

  On the other hand, the antireflection film 20 is a functional optical member having a function of preventing reflection on the display surface due to external light, and is an indispensable member for LCD, PDP, and organic EL. The cross-sectional structure is shown in FIG. 3A. On the film base 5 having a thickness of about 40 to 80 μm, the hard coat layer 13 having a thickness of about 5 μm, the antistatic layer 12 having a thickness of about 0.1 μm, and 0 The antireflection layer 11 of about 1 μm is laminated in this order. The refractive index of the antireflection layer 11 is set to an intermediate refractive index between the refractive index of the film and air. Each layer may be made of an inorganic material, but is generally made of an ionizing radiation curable resin film in consideration of the refractive index and the like.

  The polarizing film 30 has a configuration in which iodine is dispersed in a PVA film having a thickness of 40 to 60 μm that is stretched and oriented, and is sandwiched between TAC films 5 and 5 ′ having a thickness of about 40 to 80 μm ( FIG. 3 (b)). Although not shown, the viewing angle improving film, which is one of the retardation films, is a film in which disk-like molecules having a negative refractive index are oriented on a film substrate. Most functional optical films are obtained by forming an organic film on a film substrate.

FIG. 3C shows a mode in which the supporting film base material 5 is made common to the polarizing film 20 and the antireflection film 30. A polarizing film 30 is disposed on the back side of the film base 5, and an antireflection film 20 and a separate functional optical member are disposed on the front side. The same film base material can be used for touch panels with thin metal wires. However, if there are two functions to be integrated, one film base material can be used. 2 are required.
Below, the aspect which reduced the number of film base materials is demonstrated using FIG.

A 1st aspect is the sharing of the film base material between a touchscreen and one functional optical member.
As shown in FIGS. 2 (a) and 2 (b), there are two types of thin metal wires laid on the touch panel 10, and there are two common types as shown in FIGS. 4 (a) and 4 (b). FIG. 2 (a) shows a case where fine metal wires are laid on both sides of the film substrate, and an antireflection film 20 (hard coat layer / (antistatic layer) / antireflection layer) is directly applied on one side of the fine metal wire. This is an example of stacking. Although not shown, a polarizing film 30 composed of a polarizing layer / protective layer may be laminated.

FIG. 2B is an example in which a metal mesh structure is laid on one side of the film substrate 5 and a polarizing film 30 (polarizing film / protective film) is laminated on the other side that is not laid. In this case, the protective film is a TAC film. Or it can be said that the metal fine wire of the mesh structure was laid in one side of the film base material which comprises a polarizing plate. It can also be set as the structure which made the hard coat layer / (antistatic layer) / antireflection layer above the polarizing layer. As is apparent from a comparison between FIG. 3 and FIG. 4, the number of film bases having a thickness of about 40 to 80 μm is reduced by one.
In addition, “{” and “}” in the figure indicate the range of the touch panel and the optical member before sharing.

The second embodiment is a case where two types of functional optical members and a touch panel are combined.
When mounted on a liquid crystal display, the antireflection film 20 needs to be disposed on the outermost surface on the viewer side. Therefore, based on this, there are two laminated forms of the three types of functional members. Since there are two types of touch panel configurations, one for FIG. 2A and two for the front and back, FIG. Only two of them are shown in FIGS. 4 (c) and 4 (d). FIG. 4C shows a polarizing film 30 (polarizing layer / protective layer) and an anti-reflective film 20 (hard coat layer / anti-static layer / anti-reflective layer) on top of a thin metal wire (touch panel 10) laid in stripes. Are stacked in this order. It is desirable that the antistatic layer 12 may be omitted.

  The difference between (c) and (d) in FIG. 4 is whether either the touch panel 10 or the polarizing plate 30 is arranged in the lower stage. The remaining combination (not shown) is a case where a mesh structure made of fine metal wires is laid only on one side of the film substrate (see FIG. 2B). In this case, the functional optical member is preferably laid on the side where the mesh electrode is not laid, but the method is not limited thereto. As is obvious from comparison between FIG. 3 and FIG. 4, two film bases having a thickness of about 40 to 80 μm are reduced rather than simply stacking each other.

  When the fine metal wire is exposed on the air side, the copper surface is oxidized by moisture or oxygen in the air, and the resistance gradually increases. Under an acceleration condition of 85 ° C. and 95% RH, the resistance increases by about 20% after 1000 hours. Therefore, it is preferable to cover the fine metal wire with a protective film made of an organic resin.

  The size of the transparent portion of the touch panel is used so as to overlap with an image display unit such as a liquid crystal display or an organic EL, so that it is at least as large as these image display units. However, if the entire range is not the input range of the touch panel, the mesh electrode may be omitted even if the range is a fluoroscopic range. In general, it is preferable to paint in a frame shape so that it is not visible outside the range that requires fluoroscopy (decoration).

  The individual copper wires (fine wires) 2 and 3 constituting the mesh electrode are all guided to the outer periphery of the film base 5 and connected to the terminals for external connection. The wiring 6 is called a lead-out wiring and is preferably made of copper with low cost and low resistance. In a portion that is not seen through, the line width can be increased within an allowable range. In this case, a range of approximately 0.02 to 0.5 mm is preferable. The mesh-like copper wirings 2 and 3 and the drawing copper distribution wiring 6 are collectively formed from a copper thin film laminated on the film 5. All copper wiring needs to be insulated from each other as long as they are used as sensors.

  Assuming that the width of the opening 4 of the mesh partitioned by the copper wiring is a and the wiring width of the light-shielding portion is d, d / a = 0.05 at an opening ratio of 90%, d / a = 0. It is about 01. Since the line width d of the light-shielding metal is said to be invisible when it is approximately 20 μm or less, the side a of the opening is in the range of 400 to 2000 μm when the line width d = 20 μm. The narrower line width d = 10 μm needs to be in the range of 200 to 1000 μm and d = 5 μm in the range of 100 to 500 μm. For large displays, the line width is preferably about 50 μm or less, and the aperture ratio is 90% and a is about 1000 μm or more.

  The surface resistance of the copper wiring is preferably set to about 3Ω / □ or less. This is because the sensor sensitivity is higher when the resistance is lower. Further, since the film 5 having a thickness of about 100 μm is interposed between the upper and lower metal wirings 2, 3, the capacitance is preferably set in the range of 0.5-3 pF.

  Incidentally, the surface resistance was 0.3Ω / □ (by the four-terminal method) when the electrolytic copper foil was etched to form a mesh structure having a thickness of 13 μm, a line width of 10 μm, a pitch of 1000 μm, and an aperture ratio of 98%. The deposited copper foil had a thickness of 1.5 μm, a line width of 5 μm, a mesh pitch of 250 μm (substantially corresponding to the above-mentioned a), an aperture ratio of 93%, and a surface resistance of 3Ω / □. Although there are material differences in manufacturing method, the surface resistance can be controlled to a desired value within a range of 3Ω / □ or less.

  As for the transparent film substrate, PET is preferable from the viewpoint of cost, but a triacetyl cellulose film (TAC) is usually used for the support film for the antireflection film and the polarizing plate, and TAC is particularly preferable also in the present invention. The thickness is preferably in the range of 50 to 200 μm. However, polyethylene resin, polypropylene resin, methacrylic resin, cyclic polyolefin resin, polystyrene resin, acrylonitrile- (poly) styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), poly Thermoplastic resin films produced from vinyl chloride resins, poly (meth) acrylic resins, polycarbonate resins, polyester resins, polyamide resins, polyamideimide resins, and the like can also be used.

  As a means for forming an organic resin coating film serving as a functional optical member on a film substrate, a roll-to-roll method is preferable, from a die coating method or a cylinder plate in which resin ink is dropped onto a film from a predetermined narrow nozzle. Any method of transferring resin ink may be used. As the printing method, an intaglio printing method such as gravure printing, offset printing, flexographic printing or the like can be appropriately selected and used. The method of dropping from the nozzle can be selected from die coating, slit die coating, lip coating and the like. In either case, a coating film having a thickness in the range of several μm to 50 μm can be formed.

  As the organic resin layer, an ionizing radiation curable composition is used. The organic resin layer is a curable composition that is used after being cured by crosslinking with ionizing radiation energy such as electromagnetic waves, ultraviolet rays, visible rays, and electron beams. In the case of curing by ultraviolet irradiation, a high pressure mercury lamp light source containing light having a wavelength in the range of 150 to 450 nm is used. In the case of electron beam curing, an electron beam with an irradiation voltage of 3 to 300 kGy in an acceleration voltage range of 10 to 500 kV, more preferably 30 to 200 kV is required.

  Specific examples of the curable composition include a (meth) acrylate-based composition, and a mixture of a prepolymer, an oligomer and a monomer having a polymerizable unsaturated bond or an epoxy group in the molecule is used. Examples of the prepolymer and oligomer include unsaturated polyesters, methacrylates, acrylates, and cationically polymerizable epoxy compounds.

  Examples of the monomer include compounds such as ethylene glycol diacrylate and propylene glycol diacrylate, polyfunctional compounds such as dipropylene glycol diacrylate, and polythiol compounds. In addition, a polymerization initiator or the like is necessary.

  Next, the manufacturing method of the touch panel in which the functional optical members are combined will be described with reference to the process diagram of FIG. In particular, an example will be described in which a TAC film is used as the roll-shaped film substrate 5, an antireflection film 20 is formed on one surface, and a metal fine wire mesh for the touch panel 10 is formed on the back surface. The order of forming the functional optical film and the fine metal wire is not limited to the following, and may be determined as convenient. Further, in FIG. 5, it is drawn as a single wafer processing, but a single wafer method may be used instead of the roll method.

  PETA (light acrylate PE-3A; solid content concentration of 100%) was used as a hard coat coating solution, and the solid content concentration was diluted to 50% using IPA as a solvent. Irgacure 184 (manufactured by Ciba Specialty Chemicals Co., Ltd.) was added as a curing agent to 5% of PETA for adjustment. Furthermore, 0.1% of the fluorine-based additive F-470 (manufactured by DIC Corporation 9) was added to the solid content to obtain a hard coat coating solution.

  As an antireflection layer coating liquid, porous silica fine particle dispersion (average particle size 50 nm, solid content 20%, solvent: methyl isobutyl ketone) 15.00 parts by weight, EO-modified dipentalysitol hexaacrylate (trade name: DPEA) -12, manufactured by Nippon Kayaku Co., Ltd.) 2.00 parts by weight, Irgacure 184 (manufactured by Ciba Specialty Chemicals) as a curing agent, 0.07 parts by weight, TSF4460 (trade name: manufactured by GE Toshiba Silicones Co., Ltd .: alkyl) Polyether-modified silicone) 0.20 part by weight was diluted with 82.00 parts by weight of methyl isobutyl ketone to prepare a coating solution for a low refractive index layer.

The above hard coat coating solution is applied to one surface of a TAC film 5 (trade name: Fujitac TD80UL) having a thickness of 80 μm with a micro gravure coater, and then passed through a drying chamber (not shown). A dried coating was obtained. Thereafter, the hard coat layer 13 was obtained by irradiating UV light with a main wavelength of 365 nm and an irradiation intensity of 40 mJ / cm ² · sec for 40 seconds from the provided 250 W ultra-high pressure mercury lamp to cure the coating film (FIG. 5A). .

  Next, a coating liquid for a low refractive index layer was applied on the hard coat 13 layer using a micro gravure coater so that the thickness was 0.20 μm, dried and then irradiated with UV to form an antireflection layer 11 (see FIG. 5 (b)).

Next, a regular corona discharge treatment was applied to the back surface of the TAC film 5 as an easy adhesion treatment. As the easy adhesion treatment, other anchor coats are also possible.
Next, an electrolytic copper foil 16 having a smooth surface having a thickness of 8 μm was laminated through an OCA (optical adhesive) 15 having a thickness of 10 μm (FIG. 5C). Since the line width of the copper wire formed by etching the copper foil cannot be made thinner than the thickness of the copper foil, it is necessary to determine the type and thickness of the copper foil from the desired line width. When the line width is as thin as about 5 to 7 μm, it is preferable to use a copper thin film deposited on the film. Other than the electrolytic copper foil, a rolled copper foil can also be used.

Next, the negative resist was applied to the copper foil surface with a thickness of about 6 μm using a roll coater and dried at 90 ° for 30 minutes. Next, the negative resist was irradiated with 100 mJ / cm ² through a photomask provided with a stripe pattern, an extraction electrode pattern, and the like (not shown). As a resist, a casein resist can be used in addition to a general-purpose dry film type negative resist.

  The photoresist layer was then developed with a 3% aqueous sodium carbonate solution. As a result, a resist pattern was formed in a portion corresponding to the stripe pattern of the copper wiring, and the resist in other portions was removed.

  Next, the exposed portion of the copper foil was removed by etching using a ferric chloride solution having a specific gravity of 1.45, and the remaining resist was peeled off. As a result, stripe-like metal wirings 2 having a line width of 10 μm and a pitch of 250 μm as viewed from above are formed on the back surface of the film substrate 5, and at the same time, lead-out wirings are also formed on the outer periphery (FIG. 5D )).

Next, an electrolytic copper foil having a thickness of 8 μm was bonded onto the striped thin metal wire through an OCA having a thickness of 10 μm. The OCA becomes an insulating layer that insulates the upper and lower metals.
Alternatively, a TAC film obtained by laminating an electrolytic copper foil having a thickness of 8 μm on one surface may be bonded using OCA for back-to-back so that the copper foil is on the atmosphere side.
Alternatively, the copper foil layer may be formed by vapor deposition after covering the striped metal fine wire with a transparent resin layer.

In any case, the negative resist was then applied to the copper foil surface with a thickness of about 6 μm using a roll coater and dried at 90 ° for 30 minutes. Next, UV light was irradiated at about 100 mJ / cm ² through a photomask having a stripe pattern perpendicular to the lower stripe pattern.

  The photoresist layer was then developed with a 3% aqueous sodium carbonate solution. As a result, a resist pattern was formed in a portion corresponding to the stripe pattern of the copper wiring, and the resist in other portions was removed.

  Next, using a ferric chloride solution having a specific gravity of 1.45, the exposed portions of the copper foil were etched away at the same time, and the remaining resist was peeled off. Thereby, the striped metal wiring 3 was formed on the back surface of the film base material 5 as viewed from above, and a sensor part in which the metal thin wires formed a mesh structure as a whole was obtained. Even when the optical adhesive is used as the insulating layer, the fine metal wire formed in advance is protected by the adhesive and is not etched.

  Note that an antireflection film may be laid after a mesh-like fine metal wire pattern is first formed on one surface of the film substrate. Alternatively, a stripe-shaped metal pattern may be formed on the front and back of the film substrate, and then the functional optical member may be formed on one or both surfaces.

1, mesh structure 2, stripe electrode 3 in X direction, stripe electrode 4 in Y direction, opening 5, 5 'film substrate 8, insulating resin 9, intersection 10, touch panel 11, antireflection layer 12, antistatic Layer 13, hard coat layer 14, polarizing layer 15, OCA (optical adhesive)
16, copper foil 20, antireflection film 30, polarizing film (plate)
a; opening width d; wiring width

Claims (10)

  A capacitive capacitive touch panel comprising a capacitive touch panel having a mesh structure of fine metal wires on one surface of a film substrate, and further comprising a functional optical film on one or both surfaces. .   The film substrate is provided with stripe-shaped fine metal wires on one surface, the other surface is provided with stripe-like fine metal wires orthogonal to the stripe-like fine wires, and further provided with a functional optical film on one or both surfaces. A film-type capacitive touch panel characterized by that.   The film-like capacitive touch panel according to claim 1 or 2, wherein the functional optical film is an antireflection film, and a hard coat layer and an antireflection layer are laminated in this order.   The film-like capacitive touch panel according to claim 1 or 2, wherein the functional optical film is a polarizing film, and a polarizing layer and a protective layer are laminated in this order.   The functional optical film is a polarizing film having an antireflection function, and a polarizing layer, a protective layer, a hard coat layer, and an antireflection layer are laminated in this order. The film-like capacitive touch panel described in 1.   The film-like capacitive touch panel according to claim 3, further comprising an antistatic layer under the antireflection layer. Forming a copper foil layer on either side of the film substrate that supports the functional optical film on one side;
Forming a striped copper wiring from a copper foil layer by a photolithography method;
Forming an insulating layer on the copper wiring;
Forming a copper foil layer;
Forming a striped copper wiring from a copper foil layer on an insulating layer by a photolithography method. A method of manufacturing a film-like capacitive touch panel, comprising:   A film-like capacitive touch panel characterized by laminating a functional optical film on either or both sides of a film substrate provided with striped copper wires perpendicular to each other on the front and back of the film substrate Manufacturing method.   The method for producing a film-type capacitive touch panel according to claim 7 or 8, wherein the functional optical film is an antireflection film, a polarizing film, or both.   The said copper foil layer is either an electrolytic copper foil or a vapor deposition copper foil, The manufacturing method of the film-like capacitive touch panel of Claim 7 or Claim 9 characterized by the above-mentioned.