WO2021079635A1 - タッチセンサ - Google Patents

タッチセンサ Download PDF

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Publication number
WO2021079635A1
WO2021079635A1 PCT/JP2020/034008 JP2020034008W WO2021079635A1 WO 2021079635 A1 WO2021079635 A1 WO 2021079635A1 JP 2020034008 W JP2020034008 W JP 2020034008W WO 2021079635 A1 WO2021079635 A1 WO 2021079635A1
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WO
WIPO (PCT)
Prior art keywords
transparent film
base material
laminated body
film base
back side
Prior art date
Application number
PCT/JP2020/034008
Other languages
English (en)
French (fr)
Inventor
康祐 松本
充 加賀瀬
輝之 向後
Original Assignee
Ｎｉｓｓｈａ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｎｉｓｓｈａ株式会社 filed Critical Ｎｉｓｓｈａ株式会社
Priority to EP20879372.9A priority Critical patent/EP4026692B1/en
Priority to US17/771,352 priority patent/US11853517B2/en
Priority to CN202080023631.9A priority patent/CN113614682A/zh
Priority to KR1020217026511A priority patent/KR20220082779A/ko
Publication of WO2021079635A1 publication Critical patent/WO2021079635A1/ja

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    • 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
    • G06F3/0412—Digitisers structurally integrated in a display
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    • 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
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    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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Definitions

  • the present invention relates to a touch sensor having excellent crack resistance.
  • the touch sensor is a display device as an input means for various devices (for example, ticket vending machines, ATM devices, mobile phones, game machines) incorporating display devices such as organic EL, liquid crystal displays, and plasma displays. It is used with. In such devices, the touch sensor is located on the display surface of the display device, which allows the touch sensor to make a very direct input to the display device.
  • the capacitance method uses a weak current to flow through the touch sensor surface to form an electric field, and the change in capacitance value when a conductor such as a finger touches lightly causes a voltage drop, etc.
  • the contact position obtained by converting to and detecting is output as a signal.
  • a touch sensor used in the capacitance method a touch sensor in which a transparent electrode and a connection terminal portion are formed on a pair of opposing substrates is generally known. Further, as another aspect, one in which a transparent electrode and a connection terminal portion are formed on both sides of one transparent substrate (hereinafter, double-sided type touch sensor) is known (for example, Patent Document 1).
  • the double-sided type touch sensor has a small number of members and can be made thinner, and can be manufactured by a roll-to-roll process to improve productivity. Further, since it is not necessary to bond the two substrates, problems such as misalignment between the two transparent electrodes can be avoided.
  • a film in which a transparent conductive film is adhered to one opposite surface of a transparent film base material formed of a metal pattern on the surface of a transparent film base material made of resin, glass, etc. is used as an upper protective film.
  • a film in which a transparent conductive film is adhered to the other facing surface of the transparent film base material is used as a lower protective film, and a structure in which the upper protective film and the lower protective film are bonded to each other is generally widely used.
  • the electrodes of the touch sensor and the control circuit are connected through a flexible printed wiring board (hereinafter referred to as FPC).
  • FPC flexible printed wiring board
  • the wiring board terminal portion at one end of the FPC is connected to the front side terminal and the back side terminal on the transparent film base material.
  • the upper protective film and the lower protective film are provided with a notch at a position corresponding to the FPC adhesive portion to facilitate the adhesion between the FPC and the sheet terminal portion.
  • a double-sided type touch sensor is manufactured through a process of removing the outer shape for cutting according to a predetermined product size.
  • the cushion material is provided inside the outer die, the upper protective film is pressed against the inner cushion material of the outer die when cutting to a predetermined product size with the outer die.
  • stress is applied in the vertical direction, only one layer of the transparent film base material is exposed inside the notch, while the outside of the notch is the transparent film base material, the upper protective film, and the lower protective film. Because of the three layers, stress is concentrated on the inner boundary of the notch, and cracks occur in the transparent film base material from both ends straddling the inside to the outside of the notch at the opening end of the notch. There was (see FIG. 8).
  • An object of the present invention is to provide a touch sensor having excellent crack resistance that solves the above problems.
  • the touch sensor of the present invention has a transparent film base material, a front side electrode formed on one surface of the transparent film base material, and a surface on which the front side electrode of the transparent film base material is formed.
  • the back side electrode formed on the other surface of the transparent film base material, and the back side electrode formed on the back side electrode of the transparent film base material On the front side terminal formed on the front side electrode and connected to the front side electrode, the back side electrode formed on the other surface of the transparent film base material, and the back side electrode formed on the back side electrode of the transparent film base material.
  • the transparent film base material has a connection terminal portion inside one side of the transparent film base material and is connected and has a back side terminal formed so as not to overlap with the front side terminal in a plan view.
  • a touch sensor in which a material is laminated with a pair of films of an upper protective film and a lower protective film, and both of the pair of films are provided with a notch portion in which a region facing the front side terminal and the back side terminal is cut out.
  • the shape is gradually widened from the open end of the notch to the inner part in a trapezoidal shape.
  • a front side terminal formed on a transparent film base material a front side electrode formed on one surface of the transparent film base material, and a front side electrode formed on the front side electrode of the transparent film base material, and connected to the front side electrode.
  • the back side electrode formed on the other surface of the transparent film base material and the back side electrode formed on the transparent film base material are connected to the back side electrode and do not overlap with the front side terminal in plan view.
  • the back side terminal On the surface on which the back side electrode of the transparent film base material is formed, the back side terminal is connected to the back side electrode and is formed so as not to overlap the connection terminal portion of the first laminated body in a plan view.
  • a second laminated body having a connection terminal portion inside one side of a transparent film base material, and an adhesive layer between the first laminated body and the second laminated body in the first laminated body and the second laminated body.
  • the first laminated body is provided with a notch portion in which a region facing the connection terminal portion of the second laminated body is cut out, and the second laminated body is provided with a connection terminal portion of the first laminated body.
  • a notch portion is provided so as to cut out the opposing regions, and the first laminated body and the second laminated body are laminated with a pair of films of the upper protective film and the lower protective film, and in both of the pair of films, the first In a touch sensor provided with a notch portion that cuts out a region facing the connection terminal portion of the laminated body and the connection terminal portion of the second laminated body, the first laminated body, the second laminated body, and the upper portion are provided in a plan view.
  • Both the protective film and the lower protective film are configured to have a trapezoidal shape that gradually widens from the open end of the notch to the inner part.
  • the notch portion may be configured so that the outer angle of the upper base of the trapezoidal shape in contact with the outer peripheral line is 30 degrees or more and 60 degrees or less.
  • a reinforcing layer may be provided on the transparent film base material in the regions at both ends of the cutout portion of the pair of protective films straddling the inside to the outside of the cutout portion.
  • the touch sensor having excellent crack resistance includes a transparent film base material, a front side electrode formed on one surface of the transparent film base material, and a front side electrode of the transparent film base material formed on the surface. Connected to the back side electrode on the front side terminal formed in and connected to the front side electrode, the back side electrode formed on the other surface of the transparent film base material, and the back side electrode formed on the transparent film base material.
  • the transparent film base material has a connection terminal portion inside one side of the transparent film base material, and has a back side terminal formed so as not to overlap with the front side terminal in a plan view.
  • both of the pair of films are provided with a notch portion in which a region facing the front side terminal and the back side terminal is cut out.
  • it is configured to have a trapezoidal shape that gradually widens from the open end of the notch toward the back, so by gradually widening the trapezoidal shape from the open end of the notch toward the back.
  • the stress applied to the transparent film base material at the notch during pressurization to remove the outer shape is relaxed, and cracks do not occur at the boundary portion of the transparent film base material.
  • the touch sensor 9 of the present invention has a transparent film base material 1, a front side electrode 5 formed on one surface of the transparent film base material 1, and a front side electrode 5 of the transparent film base material 1 formed on the surface.
  • a transparent film base material 1 On the front side terminal 7 formed and connected to the front side electrode 5, the back side electrode 6 formed on the other surface of the transparent film base material 1, and the back side electrode 6 of the transparent film base material 1 are formed.
  • the transparent film base material 1 is connected to the inside of one side of the transparent film base material 1 and has the back side terminal 8 connected to the back side electrode 6 and formed so as not to overlap the front side terminal 7 in a plan view.
  • the touch sensor 9 provided with the notch portion 4 is configured so as to gradually become a wide trapezoidal shape from the opening end 10 of the notch portion 4 toward the inner portion 12 in a plan view. Yes (see Figures 1 (a) and 1 (b)).
  • the transparent film base material 1 has a structure in which a pair of films of the upper protective film 2 and the lower protective film 3 are laminated to prevent damage due to an external impact, and also to prevent damage due to an external impact. Since it is laminated with the upper protective film 2 and the lower protective film 3, it prevents the ingress of moisture and the like from the outside.
  • the upper protective film 2 and the lower protective film 3 are provided with notches 4 for exposing the front side terminals 7 and the back side terminals 8 provided on the transparent film base material 1, respectively.
  • the cutout portion 4 is formed in a trapezoidal shape gradually widening from the opening end 10 toward the inner portion 12.
  • the material constituting the transparent film base material 1 is not particularly limited as long as it is made of a transparent resin, but specifically, cycloolefin polymer (COP), polyethylene terephthalate (PET) and the like. Examples thereof include polyethylene-based resins and polyester-based resins such as polyether sulfone.
  • the thickness of the transparent film base material 1 used in the present invention is such that the front side electrode 5, the back side electrode 6, the front side terminal 7, the back side terminal 8, the connection terminal portion 11, etc. can be stably supported. If there is, it is not particularly limited, but it can usually be in the range of 50 ⁇ m to 100 ⁇ m. Further, the form to be supplied may be either a roll shape or a single-wafer shape, and may be selected according to the processing method and processing machine.
  • the front side electrode 5 in the present invention is formed on one surface of the transparent film base material 1, and the back side electrode 6 is formed on the other surface of the transparent film base material 1. ..
  • the material constituting the front side electrode 5 and the back side electrode 6 is not particularly limited as long as it has desired conductivity, and even a transparent material having transparency can be made transparent. It may be a non-transparent material that does not have, but it is preferably a transparent material.
  • the transparent material in the present invention those generally used for the touch sensor 9 can be used, for example, indium tin oxide (ITO), zinc oxide, indium oxide, antimony-added tin oxide, and fluorine-added oxidation.
  • Metal oxides such as tin, aluminum-added zinc oxide, potassium-added zinc oxide, silicon-added zinc oxide, zinc oxide-tin oxide-based, indium oxide-tin oxide-based, zinc oxide-indium oxide-magnesium oxide-based, and these Examples thereof include materials in which two or more types of metal oxides are composited. Further, as the non-transparent material, for example, metals such as aluminum, molybdenum, silver, chromium and copper and alloys thereof can be used.
  • the formation pattern, thickness, and the like of the front side electrode 5 and the back side electrode 6 can be the same as those of a general touch sensor.
  • the front side terminal 7 in the present invention is formed on the surface on which the front side electrode 5 of the transparent film base material 1 is formed and is connected to the front side electrode 5, and the back side terminal 8 is the back side electrode of the transparent film base material 1.
  • 6 is formed on the surface on which the front side terminal 7 is formed so as not to overlap with the front side terminal 7 in a plan view, is connected to the back side electrode 6, and is formed directly on the surface of the transparent film base material 1 (see FIG. 5). ).
  • the front side terminal 7 and the back side terminal 8 can easily and efficiently connect the touch sensor 9 and the FPC in units of the connection terminal portion 11.
  • the number of terminals included in such a connection terminal portion 11 is appropriately set according to the heat tool or the like used for connecting to the FPC.
  • connection terminal portion 11 is usually composed of a plurality of terminals arranged in parallel on the same surface of the transparent film base material 1 (see FIG. 1 (b)).
  • FIG. 2 is a plan view (a) and a cross-sectional view (b) of the touch sensor 9 according to the embodiment of the present invention.
  • the cross-sectional view of FIG. 2 (b) is a cross-sectional view corresponding to the cross-sectional view taken along the line AA in the plan view of FIG. 2 (a).
  • FIG. 5 is an exploded perspective view of the touch sensor 9 according to the embodiment of the present invention.
  • the distance between the adjacent front side terminal 7 and the back side terminal 8 in the present invention is not particularly limited, and can be general for the touch sensor 9.
  • the material constituting the front side terminal 7 and the back side terminal 8 in the present invention is not particularly limited as long as it can obtain desired conductivity, but for example, aluminum, silver, copper or an alloy thereof may be used. Can be used.
  • the terminal width, thickness, and plan view shape of the front side terminal 7 portion and the back side terminal 8 portion, and the distance between the terminals in the connection terminal portion 11 can be the same as those of a general touch sensor.
  • the upper protective film 2 and the lower protective film 3 in the present invention are not particularly limited as long as they have insulating properties, but when they are formed so as to cover the electrodes, they are transparent. It is preferable to have.
  • the upper protective film 2 and the lower protective film 3 having such insulating properties and transparency include urethane-based resins such as acrylic resin and SiO2, polyester-based resins, polystyrene-based resins, polyamide-based resins, and chlorinated polyolefin resins. , Thermoplastic resins such as chlorinated ethylene-vinyl acetate copolymer resin, cyclized rubber, and Kumaron inden resin.
  • An adhesive film for surface protection (PSA) may be used.
  • the cutout portion 4 in the present invention is formed by cutting out at least a region facing the front side terminal 7 portion and the back side terminal 8 portion.
  • the cutout portion 4 has a back portion 12 and a side portion 19 that continues to both ends of the back portion 12 and reaches the opening end 10.
  • the cutout portion 4 is formed in a trapezoidal shape gradually widening from the opening end 10 toward the inner portion 12 in a plan view (see FIGS. 3 and 5).
  • the stress applied to the transparent film base material 1 of the notch portion 4 at the time of pressurizing the outer shape is relaxed, and cracks are less likely to occur at the boundary portion of the transparent film base material 1.
  • the notch portion 4 preferably has a trapezoidal outer angle 15 within a range of 30 degrees or more and 60 degrees or less. Within such a range, the stress applied to the transparent film base material 1 of the cutout portion 4 is further relaxed, and cracks are less likely to occur at the boundary portion of the transparent film base material 1.
  • the outer angle 15 of the trapezoidal shape may be set to 45 degrees (see FIGS. 3 and 5).
  • FIG. 9 shows a modified example of the present embodiment.
  • the outer angle 15 is used as a method of relieving the stress applied to the transparent film base material 1 of the notch portion 4 at the time of pressurizing the outer shape and making it difficult for cracks to occur at the boundary portion of the transparent film base material 1.
  • the side portion 19 may be cut out in a curved shape, and the outer angle 15 may be, for example, 45 degrees. (See FIG. 9 (a)).
  • the outer angle 15 is 30 degrees or more and 60 degrees.
  • the side portion 19 may be cut out into a polygonal shape as long as it is within the range of degrees or less, and the outer angle 15 can be set to, for example, 45 degrees. (See FIG. 9B).
  • one of the outer angles 15 may be cut out in a curved or polygonal shape within a range of 30 degrees or more and 60 degrees or less.
  • One outer angle 15 can be set to, for example, 45 degrees. (See FIG. 9 (c)).
  • the outer angle 15 is 30 degrees or more and 60 degrees or more. If it is within the range of degrees or less, it is not necessary to adjust the outer angles 15 on both sides to the same angle. That is, the shape of the notch portion 4 may be any shape as long as the outer angle 15 is within the range of 30 degrees or more and 60 degrees or less.
  • the reinforcing material 14 may be provided on the transparent film base material 1 in the regions at both ends straddling from the inside to the outside of the cutout portion 4.
  • the stress applied to the transparent film base material 1 of the notch portion 4 at the time of pressurizing the outer shape can be further relaxed, and cracks can be further less likely to occur at the boundary portion of the transparent film base material 1. (See FIGS. 4 (a), 4 (b), 7).
  • FIG. 4A and 4B are partial plan views of the touch sensor 9 according to the embodiment of the present invention, FIG. 4A is a partial plan view without the reinforcing material 14, and FIG. 4B is provided with the reinforcing material 14. It is a partial plan view.
  • the material of the reinforcing material 14 may be the same as the material constituting the electrode, or may be a different material, and is not particularly limited.
  • the touch sensor 9 of the present invention has at least a transparent film base material 1, a front electrode 5, a front terminal 7, a back electrode 6, a back terminal 8, an upper protective film 2, and a lower protective film 3, but if necessary. It may have other configurations. As such another configuration, for example, a routing wiring 16 for connecting electrodes and terminals can be mentioned.
  • the routing wiring 16 can be the same as that used for a general touch sensor 9. Specifically, those made of the same material as the terminals can be used. Further, the line width of the routing wiring 16 can be set to about 10 ⁇ m to 100 ⁇ m.
  • the transparent film base material 1, the front side electrode 5 formed on one surface of the transparent film base material 1, and the front side electrode 5 of the transparent film base material 1 are formed on the surface on which the front side electrode 5 is formed.
  • the front side terminal 7 connected to the transparent film base material 1, the back side electrode 6 formed on the other surface of the transparent film base material 1, and the back side electrode 6 formed on the back side electrode 6 of the transparent film base material 1 are connected to the back side electrode 6.
  • a first laminated body 21 having a front side terminal 7 and a back side terminal 8 formed so as not to overlap with each other in a plan view, and having a connection terminal portion 11 inside one side of the transparent film base material 1, and transparent.
  • a film base material 1, a back side electrode 6 formed on the back surface of the transparent film base material 1, and a back side electrode 6 formed on the back side electrode 6 of the transparent film base material 1 are connected to the back side electrode 6 and are connected to the back side electrode 6.
  • an adhesive layer 20 is provided between the first laminated body 21 and the second laminated body 22, and the first laminated body 21 has a second laminated body.
  • a cutout portion 4 is provided so as to cut out a region facing the connection terminal portion 11 of the first laminated body 22, and the second laminated body 22 is provided with a cutout portion notched from a region facing the connection terminal portion 11 of the first laminated body 21.
  • Part 4 is provided, and the first laminated body 21 and the second laminated body 22 are laminated with a pair of films of the upper protective film 2 and the lower protective film 3, and in both of the pair of films, the first laminated body 21
  • the first laminated body 21 and the second laminated body 22 are provided in a plan view. 22
  • the upper protective film 2 and the lower protective film 3 all have a trapezoidal shape gradually widening from the opening end 10 of the cutout portion 4 toward the inner portion 12 (see FIGS. 3 and 6).
  • the transparent film base material 1 provided with at least the front side electrode 5, the front side terminal 7, the back side electrode 6, the back side terminal 8, and the connection terminal portion 11 is used as the first laminated body 21, and at least the back side electrode 6 and the back side terminal 8 are provided.
  • the transparent film base material 1 provided with the connection terminal portion 11 was used as the second laminated body 22, and the first laminated body 21 and the second laminated body 22 were laminated with a pair of films of the upper protective film 2 and the lower protective film 3. Others are the same as those of the invention described above.
  • the above aspect is excellent in the effect of blocking electromagnetic energy (so-called noise) emitted from, for example, a light emitting diode (OLED) using an organic substance as a light emitting material or a liquid crystal display (LCD) to the touch sensor 9.
  • a light emitting diode OLED
  • LCD liquid crystal display
  • FIG. 3 is a plan view (a) and a cross-sectional view (b) of the touch sensor 9 according to the embodiment of the present invention.
  • the cross-sectional view of FIG. 3 (b) is a cross-sectional view corresponding to the cross-sectional view taken along the line AA in the plan view of FIG. 3 (a).
  • FIG. 6 is an exploded perspective view of the touch sensor 9 according to the embodiment of the present invention.
  • connection terminal portion 11 of the second laminated body 22 is provided so as not to overlap the connection terminal portion 11 of the first laminated body 21 in a plan view, and the first laminated body 21 is provided at a position corresponding to the FPC adhesive portion.
  • a notch 4 is provided in a region facing the connection terminal portion 11 of the second laminated body 22, and the second laminated body 22 is cut in a region facing the connection terminal portion 11 of the first laminated body 21.
  • a notch 4 is provided, and further, both the upper protective film 2 and the pair of films of the lower protective film 3 face the connection terminal portion 11 of the first laminated body 21 and the connection terminal portion 11 of the second laminated body 22.
  • a notch 4 is provided in the area.
  • an adhesive layer 20 for adhering the first laminated body 21 and the second laminated body 22 is provided between the first laminated body 21 and the second laminated body 22.
  • the cutout portion 4 in the present invention is formed by cutting out at least a region facing the front side terminal 7 portion and the back side terminal 8 portion.
  • the cutout portion 4 has a back portion 12 and a side portion 19 that continues to both ends of the back portion 12 and reaches the opening end 10.
  • the notch portion 4 is formed in a trapezoidal shape gradually widening from the opening end 10 toward the inner portion 12 in a plan view.
  • the notch portion 4 preferably has a trapezoidal outer angle 15 within a range of 30 degrees or more and 60 degrees or less.
  • the trapezoidal outer angle 15 is set to, for example, 45 degrees. Can be.
  • first laminated bodies 21 may be laminated, or a plurality of second laminated bodies 22 may be laminated under the first laminated body 21 according to the purpose.
  • the material forming the transparent film base material 1 is a cycloolefin polymer and has a thickness of 100 ⁇ m.
  • the material forming the front electrode 5 and the back electrode 6 is indium tin oxide (ITO).
  • the material forming the front side terminal 7 and the back side terminal 8 is copper.
  • the material forming the upper protective film 2 and the lower protective film 3 is a surface protective adhesive film (PSA).
  • PSA surface protective adhesive film
  • the cutout portion 4 was formed into a trapezoidal shape gradually widened from the opening end 10 toward the inner portion 12, the outer angle 15 was set to 45 degrees, and the outer shape was punched with the outer die 17 to obtain the touch sensor 9.
  • Comparative Example 1 the side portion 19 of the notch portion 4 was formed into a rectangular shape without being inclined, the outer angle 15 was set to 90 degrees, and the outer shape was punched with the outer die punch 17 to obtain the touch sensor 9. In the touch sensor 9 thus obtained, cracks were generated at the boundary portion of the transparent film base material 1.
  • Example 1 the same as in Example 1 was used except for the above-mentioned angles.
  • the cutout portion 4 is formed in a tapered shape gradually narrowing from the open end 10 toward the inner portion 12, the outer angle 15 is set to 135 degrees, and the outer shape is punched with the outer die 17 and the touch sensor is used. I got 9. In the touch sensor 9 thus obtained, cracks were generated at the boundary portion of the transparent film base material 1.
  • the same as in Example 1 was used except for the above-mentioned angles.

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Abstract

【課題】本発明は、切り欠き部に台形形状の切り欠き部を形成し、耐クラック性に優れたタッチセンサを提供することを目的とする。 【解決手段】 透明フィルム基材に積層する上部保護フィルムおよび下部保護フィルムに、表側端子および裏側端子と対向する領域に、平面視において、開口端から奥部に向かって漸次幅広な台形形状の切り欠き部を形成した。

Description

タッチセンサ
本発明は、耐クラック性に優れたタッチセンサに関する。
  従来から、入力手段として、タッチセンサが広く用いられている。タッチセンサは、多くの場合、有機ELや液晶ディスプレイ、プラズマディスプレイ等の表示装置が組み込まれた種々の装置等（例えば、券売機、ATM装置、携帯電話、ゲーム機）に対する入力手段として、表示装置とともに用いられている。このような装置において、タッチセンサは表示装置の表示面上に配置され、これにより、タッチセンサは表示装置に対する極めて直接的な入力を可能にする。
このようなタッチセンサとしては、様々な方式のものが実用化されている。このなかで、静電容量方式と呼ばれるものは、タッチセンサ面に微弱な電流を流して電界を形成し、指等の導電体が軽く触れた場合の静電容量値の変化を電圧の低下等に変換して検知することにより得られた接触位置を信号として出力する
静電容量方式に用いられるタッチセンサとしては、一般的には、一対の対向する基板上に透明電極および接続端子部が形成されたものが知られている。また、別の態様としては、透明電極および接続端子部が一枚の透明基板の両面にそれぞれ形成されたもの（ 以下、両面タイプタッチセンサ）が知られている（例えば、特許文献１）。
両面タイプタッチセンサは、部材数が少なくタッチセンサの薄膜化や、ロールトゥロールプロセスによる製造が可能となることによる生産性向上等を図ることができる。また、２枚の基板を貼り合わせる必要がないため、２つの透明電極間の位置ずれ等の不具合を回避することができる。
両面タイプタッチセンサの構造としては、樹脂やガラス等からなる透明フィルム基材の表面に金属パターンで形成された透明フィルム基材の一方対向面に透明導電膜が被着されたフィルムを上部保護フィルムとし、透明フィルム基材の他方対向面に透明導電膜が被着されたフィルムを下部保護フィルムとし、上部保護フィルムと下部保護フィルムとを貼り合わせる構造が一般的に広く用いられている。
タッチセンサの電極と制御回路は、フレキシブルプリント配線板（以下、FPCと表記する）を通じて接続される。FPCの一方端部に在る配線板端子部が透明フィルム基材に在る表側端子および裏側端子に接続される。上部保護フィルムと下部保護フィルムはFPC接着部分に対応する位置に切り欠き部を設けて、FPCとシート端子部との接着の容易化を図っている。
切り欠き部を設けた上部保護フィルムと下部保護フィルムを透明フィルム基材に接着後、所定の製品サイズに合わせてカットするための外形抜きの工程を経て両面タイプタッチセンサを製造する。
しかし、外形抜き型の内側にクッション材が設けられているため、外形抜き型で所定の製品サイズに合わせてカットする際に、上部保護フィルムが外形抜き型の内側のクッション材に押し当てられ、垂直方向に応力が加わった場合、切り欠き部の内側は透明フィルム基材の１層のみが露出しているのに対し、切り欠き部の外側は透明フィルム基材および上部保護フィルムならびに下部保護フィルムの３層であるため、切り欠き部の内側の境界部位に応力が集中し、切り欠き部の開口端における切り欠き部の内側から外側にまたぐ両端から透明フィルム基材へクラックが発生するという課題があった（図８参照）。
特許第４９０１６６０号公報
本発明は上記課題を解決した耐クラック性に優れたタッチセンサを提供することを目的とする。
上記目的を達成するために、本発明のタッチセンサは、透明フィルム基材と、透明フィルム基材の一方の表面上に形成された表側電極と、透明フィルム基材の表側電極が形成された表面上に形成され、表側電極に接続された表側端子と、透明フィルム基材の他方の表面上に形成された裏側電極と、透明フィルム基材の裏側電極が形成された表面上に、裏側電極に接続され、かつ、表側端子と平面視上重ならないように形成された裏側端子とを有し、透明フィルム基材は、透明フィルム基材の一辺の内側に接続端子部を有し、透明フィルム基材が、上部保護フィルムおよび下部保護フィルムの一対のフィルムで積層され、前記一対のフィルムの両方において、表側端子および裏側端子と対向する領域を切り欠いた切り欠き部が設けられているタッチセンサにおいて、平面視において、切り欠き部の開口端から奥部に向かって漸次幅広な台形形状になるように構成した。
また、透明フィルム基材と、透明フィルム基材の一方の表面上に形成された表側電極と、透明フィルム基材の表側電極が形成された表面上に形成され、表側電極に接続された表側端子と、透明フィルム基材の他方の表面上に形成された裏側電極と、透明フィルム基材の裏側電極が形成された表面上に、裏側電極に接続され、かつ、表側端子と平面視上重ならないように形成された裏側端子とを有し、透明フィルム基材の一辺の内側に接続端子部を有する第１積層体と、透明フィルム基材と、透明フィルム基材の裏側の表面上に形成された裏側電極と、透明フィルム基材の裏側電極が形成された表面上に、裏側電極に接続され、かつ、第１積層体の接続端子部と平面視上重ならないように形成された裏側端子とを有し、透明フィルム基材の一辺の内側に接続端子部を有する第２積層体と、前記第１積層体および第２積層体において、第１積層体と第２積層体の間に接着層が設けられ、第１積層体には、第２積層体の接続端子部と対向する領域を切り欠いた切り欠き部が設けられ、第２積層体には、第１積層体の接続端子部と対向する領域を切り欠いた切り欠き部が設けられ、第１積層体と第２積層体が、上部保護フィルムおよび下部保護フィルムの一対のフィルムで積層され、前記一対のフィルムの両方において、第１積層体の接続端子部および第２積層体の接続端子部と対向する領域を切り欠いた切り欠き部が設けられているタッチセンサにおいて、平面視において、第１積層体、第２積層体、上部保護フィルム、下部保護フィルムのいずれも切り欠き部の開口端から奥部に向かって漸次幅広な台形形状になるように構成した。
また、切り欠き部において、外周線と接する前記台形形状の上底の外角が３０度以上６０度以下になるように構成してもよい。
また、一対の保護フィルムの切り欠き部の開口端における切り欠き部の内側から外側にまたぐ両端の領域に、透明フィルム基材上に補強層が設けるように構成してもよい。
本発明に係る耐クラック性に優れたタッチセンサは、透明フィルム基材と、透明フィルム基材の一方の表面上に形成された表側電極と、透明フィルム基材の表側電極が形成された表面上に形成され、表側電極に接続された表側端子と、透明フィルム基材の他方の表面上に形成された裏側電極と、透明フィルム基材の裏側電極が形成された表面上に、裏側電極に接続され、かつ、表側端子と平面視上重ならないように形成された裏側端子とを有し、透明フィルム基材は、透明フィルム基材の一辺の内側に接続端子部を有し、透明フィルム基材が、上部保護フィルムおよび下部保護フィルムの一対のフィルムで積層され、前記一対のフィルムの両方において、表側端子および裏側端子と対向する領域を切り欠いた切り欠き部が設けられているタッチセンサにおいて、平面視において、切り欠き部の開口端から奥部に向かって漸次幅広な台形形状になるように構成したので、切り欠き部の開口端から奥部に向かって漸次幅広な台形形状にすることで、外形抜きの加圧時に切り欠き部の透明フィルム基材にかかる応力が緩和され、透明フィルム基材の境界部位にクラックが発生しなくなる。
本発明の実施形態に係るタッチセンサの平面図である。 本発明の実施形態に係るタッチセンサの平面図および断面図である。 本発明の実施形態に係るタッチセンサの平面図および断面図である。 本発明の実施形態に係るタッチセンサの部分平面図である。 本発明の実施形態に係るタッチセンサの分解斜視図である。 本発明の実施形態に係るタッチセンサの分解斜視図である。 本発明の実施形態に係るタッチセンサの切り欠き部の平面図である。 タッチセンサの外形抜きの工程を示した断面図である。 本発明の実施形態に係るタッチセンサの切り欠き部の変形例を示す平面図である。
以下、本発明の耐クラック性に優れたタッチセンサ９について、図面を参照しながら実施形態の一例を説明する。
（タッチセンサ）
本発明のタッチセンサ９は、透明フィルム基材１と、透明フィルム基材１の一方の表面上に形成された表側電極５と、透明フィルム基材１の表側電極５が形成された表面上に形成され、表側電極５に接続された表側端子７と、透明フィルム基材１の他方の表面上に形成された裏側電極６と、透明フィルム基材１の裏側電極６が形成された表面上に、裏側電極６に接続され、かつ、表側端子７と平面視上重ならないように形成された裏側端子８とを有し、透明フィルム基材１は、透明フィルム基材１の一辺の内側に接続端子部１１を有し、透明フィルム基材１が、上部保護フィルム２および下部保護フィルム３の一対のフィルムで積層され、前記一対のフィルムの両方において、表側端子７および裏側端子８と対向する領域を切り欠いた切り欠き部４が設けられているタッチセンサ９において、平面視において、切り欠き部４の開口端１０から奥部１２に向かって漸次幅広な台形形状になるように構成したものである（図１(a)、(b)参照）。
図５に例示するように透明フィルム基材１は、上部保護フィルム２および下部保護フィルム３の一対のフィルムで積層された構造となっており、外部からの衝撃による破損等を防止し、また、上部保護フィルム２および下部保護フィルム３でラミネートされているため、外部からの水分等の浸入を防ぐ。
図５に例示するように、上部保護フィルム２および下部保護フィルム３にはそれぞれ、透明フィルム基材１上に設けられた表側端子７部および裏側端子８を露出させる切り欠き部４が設けられおり、平面視において、切り欠き部４の開口端１０から奥部１２に向かって漸次幅広な台形形状で形成されたものである。
（透明フィルム基材）
透明フィルム基材１を構成する材料としては、透明性を有する樹脂からなるものであれば特に限定されるものではないが、具体的には、シクロオレフィンポリマー（COP）、ポリエチレンテレフタレート（PET）等のポリエチレン系樹脂、ポリエーテルサルフォン等のポリエステル系樹脂等を挙げることができる。また、本発明に用いられる透明フィルム基材１の厚みとしては、上記表側電極５、裏側電極６、表側端子７、裏側端子８、接続端子部１１等を安定的に支持することができるものであれば特に限定されるものではないが、通常５０μｍ～１００μｍの範囲内とすることができる。また、供給される形態はロール状、枚葉状のいずれでも良く、加工法、加工機械に準じて選択すればよい。
（表側電極・裏側電極）
本発明における表側電極５は、上記透明フィルム基材１の一方の表面上に形成されるものであり、裏側電極６は、上記透明フィルム基材１の他方の表面上に形成されるものである。
このような表側電極５および裏側電極６を構成する材料としては、所望の導電性を有するものであれば特に限定されるものではなく、透明性を有する透明性材料であっても、透明性を有しない非透明性材料であってもよいが、透明性材料であることが好ましい。本発明における透明性材料としては、タッチセンサ９に一般的に用いられるものを使用することができ、例えば、インジウム錫酸化物（ITO）、酸化亜鉛、酸化インジウム、アンチモン添加酸化錫、フッ素添加酸化錫、アルミニウム添加酸化亜鉛、カリウム添加酸化亜鉛、シリコン添加酸化亜鉛や、酸化亜鉛－ 酸化錫系、酸化インジウム－ 酸化錫系、酸化亜鉛－酸化インジウム－ 酸化マグネシウム系などの金属酸化物や、これらの金属酸化物が２種以上複合された材料が挙げられる。また、非透明性材料としては、例えば、アルミニウム、モリブデン、銀、クロム、銅等の金属およびその合金等を用いることができる。
上記表側電極５および裏側電極６の形成パターンや厚み等については、一般的なタッチセンサと同様とすることができる。
（表側端子および裏側端子）
本発明における表側端子７は透明フィルム基材１の表側電極５が形成された表面上に形成され、表側電極５に接続されるものであり、裏側端子８は、透明フィルム基材１の裏側電極６が形成された表面上に表側端子７と平面視上重ならないように形成され、裏側電極６に接続されるものであり、透明フィルム基材１の表面上に直接形成される（図５参照）。
また、表側端子７および裏側端子８は、タッチセンサ９とFPCとの接続を、接続端子部１１の単位で容易かつ効率的に行うことできる。なお、このような接続端子部１１に含まれる端子の数等については、FPCとの接続に用いられるヒートツール等に応じて適宜設定されるものである。
また、接続端子部１１は、通常、透明フィルム基材１の同一表面上に並列状に配置された複数の端子からなるものである（図１(b)参照）。
図２は、本発明の実施形態に係るタッチセンサ９の(a)平面図および(b)断面図である。
なお、図２(b)の断面図は、図２(a)の平面図におけるA－ A線での断面に対応する断面図となっている。また、図５は、本発明の実施形態に係るタッチセンサ９の分解斜視図である。
本発明における隣接する表側端子７および裏側端子８の間隔としては、特に限定されるものではなく、タッチセンサ９に一般的なものとすることができる。
本発明における表側端子７および裏側端子８を構成する材料としては、所望の導電性を得られるものであれば特に限定されるものではないが、例えば、アルミニウム、銀、銅またはそれらの合金等を用いることができる。
上記表側端子７部および裏側端子８部の端子幅、厚みおよび平面視形状や、接続端子部１１内における端子間の間隔については、一般的なタッチセンサと同様とすることができる。
（上部保護フィルム・下部保護フィルム）
本発明における上部保護フィルム２および下部保護フィルム３は、絶縁性を有するものであれば特に限定されるものではないが、上記電極を覆うように形成されるものである場合には、透明性を有するものであることが好ましい。このような絶縁性および透明性を有する上部保護フィルム２および下部保護フィルム３としては、例えば、アクリル樹脂やSiO２等、ウレタン系樹脂、ポリエステル系樹脂、ポリスチレン系樹脂、ポリアミド系樹脂、塩素化ポリオレフィン樹脂、塩素化エチレン‐酢酸ビニル共重合体樹脂、環化ゴム、クマロンインデン樹脂などの熱可塑性樹脂を挙げることができる。なお、表面保護用粘着フィルム（PSA）を用いてもよい。
（切り欠き部）
本発明における切り欠き部４は、表側端子７部および裏側端子８部と対向する領域を少なくとも切り欠いて形成されている。
切り欠き部４は、奥部１２と、奥部１２の両端に続き開口端１０に至る側部１９とを有している。この切り欠き部４は、平面視において、開口端１０から奥部１２に向かって漸次幅広な台形形状に形成されている（図３、図５参照）。
このような台形形状にすることによって、外形抜きの加圧時に切り欠き部４の透明フィルム基材１にかかる応力が緩和され、透明フィルム基材１の境界部位にクラックが発生しにくくなる。切り欠き部４は、台形形状の外角１５が３０度以上６０度以下の範囲内であることが好ましい。このような範囲内にすると、切り欠き部４の透明フィルム基材１にかかる応力がより緩和され、透明フィルム基材１の境界部位にクラックがより発生しにくくなる。例えば台形形状の外角１５を４５度とするとよい（図３、図５参照）。
図９は、本実施形態の変形例を示したものである。
切り欠き部４において、外形抜きの加圧時に切り欠き部４の透明フィルム基材１にかかる応力が緩和され、透明フィルム基材１の境界部位にクラックが発生しにくくする方法として、外角１５が３０度以上６０度以下の範囲内であれば、側部１９を曲線状に切り欠いてもよく、外角１５を例えば４５度とすることができる。（図９（a）参照）。
また、外形抜きの加圧時に切り欠き部４の透明フィルム基材１にかかる応力が緩和され、透明フィルム基材１の境界部位にクラックが発生しにくくする方法として、外角１５が３０度以上６０度以下の範囲内であれば、側部１９を多角形状に切り欠いてもよく、外角１５を例えば４５度とすることができる。（図９（ｂ）参照）。
また、透明フィルム基材１の性質などに合わせて、いずれか一方の外角１５を３０度以上６０度以下の範囲内で、側部１９を曲線状、多角形状に切り欠いてもよく、いずれか一方の外角１５を例えば４５度とすることができる。（図９（ｃ）参照）。
また、外形抜きの加圧時に切り欠き部４の透明フィルム基材１にかかる応力が緩和され、透明フィルム基材１の境界部位にクラックが発生しにくくする方法として、外角１５が３０度以上６０度以下の範囲内であれば、両側の外角１５を同じ角度に合わせなくてもよい。
つまり、外角１５が３０度以上６０度以下の範囲内であれば、切り欠き部４の形状はどのような形状であってもよい。
一対の保護フィルムの切り欠き部４の開口端１０において、切り欠き部４の内側から外側にまたぐ両端の領域に、透明フィルム基材１上に補強材１４が設けてもよい。補強材１４を設けることで外形抜きの加圧時に切り欠き部４の透明フィルム基材１にかかる応力がさらに緩和され、透明フィルム基材１の境界部位にクラックがさらに発生しにくくすることができる（図４(a)、(b)、図７参照）。
図４は、本発明の実施形態に係るタッチセンサ９の部分平面図であり、図４(a)は補強材１４を設けていない部分平面図、図４(b)は補強材１４を設けた部分平面図である。
補強材１４の材料は電極を構成する材料と同様のものでもよいし、異なる材料のものでもよく、特に限定されるものではない。
（タッチセンサ）
本発明のタッチセンサ９は、透明フィルム基材１、表側電極５、表側端子７、裏側電極６、裏側端子８、上部保護フィルム２および下部保護フィルム３を少なくとも有するものであるが、必要に応じて他の構成を有するものであってもよい。このような他の構成としては、例えば、電極および端子を接続する引き回し配線１６を挙げることができる。
上記引き回し配線１６としては、一般的なタッチセンサ９に用いられるものと同様とすることができる。具体的には、端子と同材料からなるものを用いることができる。また、このような引き回し配線１６の線幅として、１０μｍ～１００μｍ程度とすることができる。
本発明の第２の態様について説明する。
すなわち、透明フィルム基材１と、透明フィルム基材１の一方の表面上に形成された表側電極５と、透明フィルム基材１の表側電極５が形成された表面上に形成され、表側電極５に接続された表側端子７と、透明フィルム基材１の他方の表面上に形成された裏側電極６と、透明フィルム基材１の裏側電極６が形成された表面上に、裏側電極６に接続され、かつ、表側端子７と平面視上重ならないように形成された裏側端子８とを有し、透明フィルム基材１の一辺の内側に接続端子部１１を有する第１積層体２１と、透明フィルム基材１と、透明フィルム基材１の裏側の表面上に形成された裏側電極６と、透明フィルム基材１の裏側電極６が形成された表面上に、裏側電極６に接続され、かつ、第１積層体２１の接続端子部１１と平面視上重ならないように形成された裏側端子８とを有し、透明フィルム基材１の一辺の内側に接続端子部１１を有する第２積層体２２と、前記第１積層体２１および第２積層体２２において、第１積層体２１と第２積層体２２の間に接着層２０が設けられ、第１積層体２１には、第２積層体２２の接続端子部１１と対向する領域を切り欠いた切り欠き部４が設けられ、第２積層体２２には、第１積層体２１の接続端子部１１と対向する領域を切り欠いた切り欠き部４が設けられ、第１積層体２１と第２積層体２２が、上部保護フィルム２および下部保護フィルム３の一対のフィルムで積層され、前記一対のフィルムの両方において、第１積層体２１の接続端子部１１および第２積層体２２の接続端子部１１と対向する領域を切り欠いた切り欠き部４が設けられているタッチセンサにおいて、平面視において、第１積層体２１、第２積層体２２、上部保護フィルム２、下部保護フィルム３のいずれも切り欠き部４の開口端1０から奥部１２に向かって漸次幅広な台形形状を備えたものである（図３、図６参照）。
上記態様は、少なくとも表側電極５、表側端子７、裏側電極６、裏側端子８、接続端子部１１が設けられた透明フィルム基材１を第１積層体２１とし、少なくとも裏側電極６、裏側端子８、接続端子部１１が設けられた透明フィルム基材１を第２積層体２２とし、第１積層体２１と第２積層体２２を上部保護フィルム２および下部保護フィルム３の一対のフィルムで積層したものであり、その他は先に説明した発明と同様である。
上記態様は、例えば発光材料に有機物質を使った発光ダイオード(OLED)や、液晶ディスプレイ(LCD)からタッチセンサ９へ放出される電磁エネルギー（所謂ノイズ）を遮る効果に優れている。
図３は、本発明の実施形態に係るタッチセンサ９の(a)平面図および(b)断面図である。
なお、図３(b)の断面図は、図３(a)の平面図におけるA－ A線での断面に対応する断面図となっている。
また、図６は、本発明の実施形態に係るタッチセンサ９の分解斜視図である。
第１積層体２１の接続端子部１１と平面視上重ならないように第２積層体２２の接続端子部１１が設けられており、FPC接着部分に対応する位置において、第１積層体２１には、第２積層体２２の接続端子部１１と対向する領域に切り欠き部４が設けられ、また、第２積層体２２には、第１積層体２１の接続端子部１１と対向する領域に切り欠き部４が設けられ、さらに、上部保護フィルム２および下部保護フィルム３の一対のフィルムの両方において、第１積層体２１の接続端子部１１および第２積層体２２の接続端子部１１と対向する領域に切り欠き部４が設けられている。
また、第１積層体２１と第２積層体２２の間には、第１積層体２１と第２積層体２２を接着させるための接着層２０が設けられている。
本発明における切り欠き部４は、表側端子７部および裏側端子８部と対向する領域を少なくとも切り欠いて形成されている。切り欠き部４は、奥部１２と、奥部１２の両端に続き開口端１０に至る側部１９とを有している。この切り欠き部４は、平面視において、開口端１０から奥部１２に向かって漸次幅広な台形形状に形成されている。
切り欠き部４は、台形形状の外角１５が３０度以上６０度以下の範囲内であることが好ましい。外形抜きの加圧時に切り欠き部４の透明フィルム基材１にかかる応力が緩和され、透明フィルム基材１の境界部位にクラックが発生しにくくする方法として、台形形状の外角１５を例えば４５度とすることができる。
上述以外は第１の態様と同様にするとよい。なお、目的に合わせて例えば、第１積層体２１を複数積層してもよく、また、第１積層体２１の下に第２積層体２２を複数積層してもよい。
透明フィルム基材１を形成する材料は、シクロオレフィンポリマーであり、厚みは１００μｍである。
表側電極５および裏側電極６を形成する材料はインジウム錫酸化物(ITO)である。
表側端子７および裏側端子８を形成する材料は銅である。
上部保護フィルム２および下部保護フィルム３を形成する材料は表面保護用粘着フィルム（PSA）である。
切り欠き部４を開口端１０から奥部１２に向かって漸次幅広な台形形状に形成し、外角１５は４５度とし、外形抜き型１７で型抜きし、タッチセンサ９を得た。
このようにして得たタッチセンサ９は、透明フィルム基材１の境界部位にクラックが生じなかった。
また、比較例１は、切り欠き部４の側部１９を傾斜させずに矩形形状にし、外角１５を９０度とし、外形抜き型１７で型抜きし、タッチセンサ９を得た。このようにして得たタッチセンサ９は、透明フィルム基材１の境界部位にクラックが生じた。なお、本比較例において、上述の角度以外は実施例１と同様とした。
また、比較例２は、切り欠き部４の開口端１０から奥部１２に向かって漸次幅狭なテーパ形状に形成し、外角１５を１３５度とし、外形抜き型１７で型抜きし、タッチセンサ９を得た。このようにして得たタッチセンサ９は、透明フィルム基材１の境界部位にクラックが生じた。なお、本比較例において、上述の角度以外は実施例１と同様とした。
１　透明フィルム基材
２　上部保護フィルム
３　下部保護フィルム
４　切り欠き部
５　表側電極
６　裏側電極
７　表側端子
８　裏側端子
９　タッチセンサ
１０　開口端
１１　接続端子部
１２　奥部
１３　外周線
１４　補強材
１５　外角
１６　引き回し配線
１７　外形抜き型
１８　クッショ材
１９　側部
２０　接着層
２１　第１積層体
２２　第２積層体

Claims (4)

  1. 透明フィルム基材と、
    透明フィルム基材の一方の表面上に形成された表側電極と、
    透明フィルム基材の表側電極が形成された表面上に形成され、表側電極に接続された表側端子と、
    透明フィルム基材の他方の表面上に形成された裏側電極と、
    透明フィルム基材の裏側電極が形成された表面上に、裏側電極に接続され、かつ、表側端子と平面視上重ならないように形成された裏側端子とを有し、
    透明フィルム基材は、透明フィルム基材の一辺の内側に接続端子部を有し、
    透明フィルム基材が、上部保護フィルムおよび下部保護フィルムの一対のフィルムで積層され、
    前記一対のフィルムの両方において、
    表側端子および裏側端子と対向する領域を切り欠いた切り欠き部が設けられているタッチセンサにおいて、
    平面視において、切り欠き部の開口端から奥部に向かって漸次幅広な台形形状になることを特徴とするタッチセンサ。
  2. 透明フィルム基材と、
    透明フィルム基材の一方の表面上に形成された表側電極と、
    透明フィルム基材の表側電極が形成された表面上に形成され、表側電極に接続された表側端子と、
    透明フィルム基材の他方の表面上に形成された裏側電極と、
    透明フィルム基材の裏側電極が形成された表面上に、裏側電極に接続され、かつ、表側端子と平面視上重ならないように形成された裏側端子とを有し、
    透明フィルム基材の一辺の内側に接続端子部を有する第１積層体と、
    透明フィルム基材と、
    透明フィルム基材の裏側の表面上に形成された裏側電極と、
    透明フィルム基材の裏側電極が形成された表面上に、裏側電極に接続され、かつ、第１積層体の接続端子部と平面視上重ならないように形成された裏側端子とを有し、
    透明フィルム基材の一辺の内側に接続端子部を有する第２積層体と、
    前記第１積層体および第２積層体において、
    第１積層体と第２積層体の間に接着層が設けられ、
    第１積層体には、第２積層体の接続端子部と対向する領域を切り欠いた切り欠き部が設けられ、
    第２積層体には、第１積層体の接続端子部と対向する領域を切り欠いた切り欠き部が設けられ、
    第１積層体と第２積層体が、上部保護フィルムおよび下部保護フィルムの一対のフィルムで積層され、
    前記一対のフィルムの両方において、
    第１積層体の接続端子部および第２積層体の接続端子部と対向する領域を切り欠いた切り欠き部が設けられているタッチセンサにおいて、
    平面視において、第１積層体、第２積層体、上部保護フィルム、下部保護フィルムのいずれも切り欠き部の開口端から奥部に向かって漸次幅広な台形形状になることを特徴とする請求項１に記載のタッチセンサ。
  3. 切り欠き部において、外周線と接する前記台形形状の上底の外角が３０度以上６０度以下であることを特徴とする請求項１から請求項２に記載のタッチセンサ。
  4. 一対の保護フィルムの切り欠き部の開口端における切り欠き部の内側から外側にまたぐ両端の領域に、透明フィルム基材上に補強層が設けられていることを特徴とする請求項１から請求項３に記載のタッチセンサ。
PCT/JP2020/034008 2019-10-23 2020-09-08 タッチセンサ WO2021079635A1 (ja)

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