JP2006004302A - Touch panel with narrow frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch panel with a narrow frame, which has a high reliability and is easy to handle. <P>SOLUTION: In the touch panel, a lower electrode member which has: a lower transparent electrode 22 on a part of an upper face of a lower transparent insulating substrate 21; and lower bus bars 23 and 24 on two parallel sides of the electrode 22, and an upper electrode member which has: an upper transparent electrode 12 on a part of a lower face of an upper transparent insulating substrate 11 having flexibility; and upper bus bars 13 and 14 on two parallel sides of the electrode 12 are opposed to each other across a spacer 3 so as to be adhered at peripheral parts, the upper and lower bus bars are made of metallic narrow wires and are fixed onto the lower and upper transparent electrodes respectively, and one ends of metallic narrow wires are extended to the outside of opposed faces of electrodes, and extended parts 15, 16, 25, 26 are bent so as to be brought into close contact with a side face and a lower face of the lower transparent insulating substrate 21 to allow front ends to be fixed to a lower face end part of the lower transparent insulating substrate, thereby external electrode connection parts 15a, 16a, 25a, 26a are formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is arranged on a display screen such as an LCD (Liquid Crystal Display) connected to a computer, and is pressed from above with a finger or a pen in accordance with instructions displayed on the fluoroscopic display screen. The present invention relates to an analog resistance film type touch panel that can input a position in the computer to a computer, and particularly relates to a narrow frame touch panel having a wide input area and display area.

  Conventionally, the analog resistive touch panel has a lower transparent electrode 122 on a part of the upper surface of the lower transparent insulating base 121 and a parallel lower electrode 122 as shown in FIG. A lower electrode member 102 having a pair of lower bus bars 123 and 124 on two sides and lower routing circuits 125 and 126 for connecting the lower bus bars 123 and 124 and external terminals to portions other than the lower transparent electrode 122, respectively. In addition, the upper transparent electrode 112 is provided on a part of the lower surface of the flexible upper transparent insulating substrate 111, and a pair of upper bus bars 113, 114 and the upper transparent electrode 112 are provided on two parallel sides of the upper transparent electrode 112. The upper electrode member 101 having the upper routing circuits 115 and 116 for connecting the upper bus bars 113 and 114 and the external terminals to the upper bus bar is respectively connected to the upper bus bar. 13,114 and lower bus bars 123 and 124 are opposed to each other via an insulating spacer 103 so that the square arrangement, are bonded at the periphery. The other ends of the upper routing circuits 115 and 116 and the lower routing circuits 125 and 126 are gathered on one side of the touch panel, and a film connector is used to connect the upper bus bars 113 and 114 and the lower bus bars 123 and 124 and external terminals. 105 is connected to the end.

By the way, recently, in order to reduce the size of the product and the size of the screen, it is desired that the touch panel as described above be formed so that the wiring of the bus bar and the routing circuit is within a narrow frame range from the edge of the panel. Yes.
Registered Utility Model No. 3018780

  However, since the film connector 105 and the upper routing circuits 115 and 116 and the lower routing circuits 125 and 126 of the touch panel are connected by thermocompression bonding, the film is thinned when the frame on the side to which the film connector 105 is crimped is thinned. The thermocompression bonding area of the connector 105 is reduced, and the adhesion strength of the thermocompression bonding portion is reduced. As a result, when the touch panel is mounted, the thermocompression bonding portion may be peeled off and cause electrical failure only by applying a slight load such as bending.

  Further, since the film connector 105 is drawn out from the side surface of the touch panel even before the touch panel is mounted, the handling of the film connector 105 must be handled with care so that the film connector 105 is not caught on anything. There is.

  Accordingly, an object of the present invention is to provide a narrow frame touch panel that solves the above-described problems, has high reliability, and is easy to handle.

In order to achieve the above object, the present invention provides a lower side having a lower transparent electrode on a part of the upper surface of the lower transparent insulating substrate and a pair of lower bus bars on two parallel sides of the lower transparent electrode. An upper electrode member having an upper transparent electrode on a part of the lower surface of the flexible upper transparent insulating substrate having flexibility and a pair of upper bus bars on two parallel sides of the upper transparent electrode. In the analog resistance film type touch panel in which the bus bar and the lower bus bar are opposed to each other through an insulating spacer so as to be in a square arrangement, and bonded at the peripheral portion,
The upper bus bar and the lower bus bar are formed of thin metal wires having a wire diameter of 30 to 100 μm and are fixed to the lower transparent electrode and the upper transparent electrode, respectively, and one end of the thin metal wire is the lower electrode member Are extended to the outside of the surface facing the upper electrode member, and the extended portion is bent so as to be in close contact with the side surface and the lower surface of the lower transparent insulating substrate, and the tip thereof is the lower surface of the lower transparent insulating substrate. The external electrode connection part was provided by fixing to an edge part.

  Moreover, in the said structure, the said external electrode connection part was provided in the four corners of a lower transparent insulating base material.

  Further, in each of the above configurations, a notch groove is provided in the end surface of the lower transparent insulating base material, and the extended portion of the thin metal wire is sandwiched in the notch groove, whereby the tip of the extended portion is placed on the lower transparent It was made to fix to the lower surface edge part of an insulating base material.

  Moreover, in each said structure, the adhesive provided with the space | gap part which exposes the said external electrode connection part on the lower surface of the said lower side transparent insulating base material was formed in the whole surface.

  Moreover, in the structure in which the pressure-sensitive adhesive provided with the gap was formed, a conductive pressure-sensitive adhesive was applied to the gap.

  Since the narrow frame touch panel of the present invention has the above-described configuration, the following effects are exhibited.

  That is, in the narrow frame touch panel of the present invention, the upper bus bar and the lower bus bar are formed of fine metal wires, and one end of the fine metal wire is extended to the outside of the facing surface of the lower electrode member and the upper electrode member, respectively. The external electrode connection part is provided by fixing the tip to the lower surface end part of the lower transparent insulating base material. In other words, since the upper bus bar and the lower bus bar to the external electrode connection portion are integrally formed by a thin metal wire, the heat of a conventional film connector is used to connect the upper bus bar and the lower bus bar to the external terminal. No crimping is required. Therefore, even if it is a narrow frame, there is no possibility that the thermocompression bonding part peels off when the touch panel is mounted to cause an electrical failure, and high reliability is obtained.

  Furthermore, the narrow frame touch panel of the present invention is bent so that the thin metal wires extending to the outside of the facing surfaces of the lower electrode member and the upper electrode member are in close contact with the side surface and the lower surface of the lower transparent insulating substrate. Because there is no part that gets caught in something like the conventional. Therefore, handling in a stage before mounting of the touch panel becomes easy.

  Hereinafter, a narrow frame touch panel according to the present invention will be described in detail with reference to the drawings. In addition, the narrow frame of the touch panel is a region where a circuit is formed in the transparent insulating base materials 11 and 21 on the upper side and the lower side of the touch panel, and a region where the frame width dimension from the outer shape is less than 1 mm. means.

  The touch panel shown in FIG. 2 has a lower transparent electrode 22 on a part of the upper surface of the lower transparent insulating substrate 21 and a pair of lower bus bars 23 and 24 on two parallel sides of the lower transparent electrode 22. The lower electrode member 2 having the upper transparent electrode 12 on a part of the lower surface of the flexible upper transparent insulating substrate 11 and a pair of upper bus bars 13 and 14 on two parallel sides of the upper transparent electrode 12. An analog resistive film type touch panel in which an upper electrode member 1 having a surface is opposed to each other via an insulating spacer 3 so that the upper bus bar and the lower bus bar are arranged in a square shape and bonded at a peripheral portion. is there.

  As the lower transparent insulating base material 21 used for the lower electrode member 2, in addition to glass plates such as soda glass, borosilicate glass, and tempered glass, engineering plastics such as polycarbonate, polyamide, and polyether ketone, or Transparent resin plates or transparent films such as acrylic, polyethylene terephthalate, and polybutylene terephthalate can be used. The lower transparent insulating substrate 21 used for the lower electrode member 2 may be a laminate of a transparent film and a transparent plastic plate. In this case, since durability as the whole touch panel improves, it is preferable.

As the flexible upper transparent insulating substrate 11 used for the upper electrode member 1, engineering plastics such as polycarbonate, polyamide, and polyether ketone, transparent such as acrylic, polyethylene terephthalate, and polybutylene terephthalate are used. A film or the like can be used. A hard coat layer can be formed on the surface of the upper electrode member 1 opposite to the surface on which the upper transparent electrode 12 of the upper transparent insulating substrate 11 is provided. The hard coat layer includes an inorganic material such as a siloxane resin, or an organic material such as an acrylic epoxy resin, a urethane thermosetting resin, or an acrylate photocurable resin. The thickness of the hard coat layer is suitably about 1 to 7 × 10 ⁻³ mm. Further, the upper transparent insulating substrate 11 of the upper electrode member 1 can be subjected to non-glare treatment on the surface opposite to the surface on which the upper transparent electrode 12 is provided to prevent light reflection. For example, it is good to carry out uneven | corrugated processing or to mix fine particles, such as extender pigment, a silica, and an alumina, in a hard-coat layer. Furthermore, the upper transparent insulating substrate 11 of the upper electrode member 1 can be a laminated body in which a plurality of films are overlapped instead of a single film.

  The upper transparent electrode 12 and the lower transparent electrode 22 are composed of metal oxide films such as tin oxide, indium oxide, antimony oxide, zinc oxide, cadmium oxide, and indium tin oxide (ITO), and a composite mainly composed of these metal oxides. It can be formed by a film or a metal film such as gold, silver, copper, tin, nickel, aluminum, palladium. Further, the upper transparent electrode 12 and the lower transparent electrode 22 can be a multilayer film of two or more layers. These transparent conductive films constituting the upper transparent electrode 12 and the lower transparent electrode 22 can be formed by vacuum deposition, sputtering, ion plating, CVD, or the like. The transparent conductive film can be patterned by a method of removing unnecessary portions other than the portions to be the upper transparent electrode 12 and the lower transparent electrode 22 by performing an etching process with an acid or the like. Moreover, you may make it cover an insulating film except the part used as the upper side transparent electrode 12 and the lower side transparent electrode 22 on a transparent conductive film.

  Moreover, when forming a large-sized touch panel, in order to ensure the space | gap between the upper side transparent electrode 12 and the lower side transparent electrode 22 of the upper side electrode member 1 and the lower side electrode member 2, the upper side transparent electrode 12 and the lower side transparent electrode 22 are secured. The dot-shaped spacer 4 can also be formed on either one of the surfaces (see FIG. 2). As the dot-shaped spacer 4, for example, a transparent photo-curing resin such as melamine acrylate resin, urethane acrylate resin, epoxy acrylate resin, methacryl acrylate resin, acrylate resin such as acrylic acrylate resin, or polyvinyl alcohol resin is finely processed by a photo process. It can be obtained by forming in a simple dot shape. In addition, a large number of fine dots can be formed by a printing method to form a spacer. The spacer can also be obtained by spraying or applying a dispersion of particles made of inorganic or organic matter and drying.

  The present invention is characterized in that the upper bus bars 13 and 14 and the lower bus bars 23 and 24 are formed of thin metal wires having a wire diameter of 30 to 100 μm and are fixed on the lower transparent electrode 22 and the upper transparent electrode 12, respectively. Furthermore, one end of the fine metal wire is extended to the outside of the facing surface of the lower transparent electrode 22 and the upper electrode member 1, respectively, and the extended portions 15, 16, 25, 26 are connected to the lower transparent insulating base. The external electrode connecting portions 15a, 16a and 25a are bent in the direction indicated by the arrow 100 in FIG. 2 so as to be in close contact with the side surface and the lower surface of the material and fixed to the lower surface end portion of the lower transparent insulating substrate 21. , 26a. FIG. 1 is a view of the touch panel as viewed from the back side, and external electrode connection portions 15 a, 16 a, 25 a, and 26 a are exposed at the four corners of the lower surface of the lower transparent insulating substrate 21.

  Gold, copper, aluminum, etc. can be used as a material of the said metal fine wire for electrically connecting an external terminal and the said electrode. Moreover, the reason for using a thin metal wire having a wire diameter of 30 to 100 μm is as follows. That is, when the wire diameter is less than 30 μm, the cross-sectional area becomes small, the wire breaks easily, it becomes difficult to handle in production, and a position detection error easily occurs on the touch panel. On the other hand, if the wire diameter exceeds 100 μm, the gap between the transparent electrodes 12 and 22 becomes large and input becomes difficult.

  The thin metal wire is fixed onto the lower transparent electrode 22 and the upper transparent electrode 12 by using a thin metal wire whose outer peripheral surface is coated with a conductive hot melt material, and the hot melt material 91 is melted and solidified to form a metal. A fine wire can be fixed on the lower transparent electrode 22 and the upper transparent electrode 12. Specifically, after the metal thin wire covered with the conductive hot melt material is disposed on the lower transparent electrode 22 and the upper transparent electrode 12, the metal thin wire is heated by a method such as pressing while heating. Pressure is applied to soften the hot melt material, and the fine metal wire is fixed by the adhesive force of the hot melt material by cooling. As the conductive hot melt material, an adhesive in which particles of gold, silver, nickel, etc. are dispersed in a synthetic rubber such as chloroprene, tin, lead, an alloy of tin and lead, or the like can be used.

  The fine metal wires can be fixed by interposing a conductive paste between the fine metal wires and the lower transparent electrode 22 and the upper transparent electrode 12. Examples of the conductive paste include thermosetting resins such as epoxy resin, phenol resin, acrylic resin, urethane resin, silicone resin, polyamide, polyethylene, polystyrene, polyester, polyurethane, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate. A thermoplastic resin such as a copolymer containing a conductive filler is used. Conductive fillers include conductive metal powders such as silver, gold, copper, nickel, platinum, and palladium, inorganic insulators such as alumina and glass as core materials, and organic polymers such as polyethylene, polystyrene, and divinylbenzene. The core material surface is coated with a conductive layer such as gold or nickel, carbon, or graphite. In addition, the conductive filler may have a flake shape, a spherical shape, a short fiber shape, or the like. As a coating method on the lower transparent electrode 22 and the upper transparent electrode 12 on and around the fine metal wire of the conductive paste, methods such as screen printing and direct application by a dispenser can be used.

  The extending portions 15, 16, 25, and 26 of the fine metal wires are bent (see FIG. 2) after the lower electrode member 2 and the upper electrode member 1 are bonded to each other at the peripheral edge. In this bending, it is better not to apply too much tension so as not to cut the fine metal wire 7. Further, the bent fine metal wires are brought into close contact with the end surface and lower surface end portions of the lower transparent insulating base material 21 so that the extended portions 15, 16, 25, 26 of the fine metal wires are not caught on anything.

  The external electrode connecting portions 15a, 16a, 25a, and 26a are provided at the lower surface end of the lower transparent insulating base material 21, but are preferably provided in a distributed manner at the four corners of the lower transparent insulating base material 21 (FIG. 1). reference). This is because when external electrode connection portions are provided at one or two corners of the lower transparent insulating base material 21, the external electrode connection portions 25a, 16a provided adjacent to each other maintain a narrow frame and do not overlap. In order to achieve this, it is necessary to perform complicated folding. For example, when the extended portion 25 is provided on the opposite side of the bus bar 23 shown in FIG. 2, the external electrode connection portions 25a and 16a provided side by side are schematically shown in FIG. On the other hand, when the external electrode connection portions are provided dispersed in the four corners of the lower transparent insulating base material, it is only necessary to fold back the tip of each metal thin wire in parallel to the bus bar (see FIG. 9).

  The lengths of the external electrode connection portions 15a, 16a, 25a, and 26a are preferably 5 mm or less. If the external electrode connection portions 15a, 16a, 25a, and 26a are too long, there is a possibility that insulation from the LCD-side electronic components that are not external terminals to be connected cannot be maintained.

  The tips of the extending portions 15, 16, 25, and 26 of the thin metal wires can be fixed to the lower end of the lower transparent insulating base material 21 by the following means. For example, it can be performed by melting and solidifying the lower transparent insulating substrate 21 (see FIG. 3). Specifically, after the tip of the thin metal wire is disposed on the lower surface of the lower transparent insulating base material 21, heat and pressure are applied by a method such as a thermal iron or a hot press, and the surface layer portion of the lower transparent insulating base material 21 is applied. Soften and fix in a state where a part of the fine metal wire is buried by cooling. However, it is limited to the case where the material of the lower transparent insulating substrate 21 of the lower electrode member 2 described above is a resin material.

  Moreover, the front-end | tip of the extended part 15, 16, 25, 26 of a metal fine wire can be fixed to the lower surface edge part of the lower side transparent insulating base material 21 with the adhesive agent 7 (refer FIG. 4). Specifically, after the tip of the fine metal wire is arranged on the lower surface of the lower transparent insulating base material 21, the fine metal wire and its surroundings to the lower transparent insulating base material 21 around the fine metal wire by a method such as screen printing or direct application by a dispenser. Covering is performed, and a fine metal wire is sandwiched and fixed between the lower transparent insulating base material 21 and the adhesive 7. As the adhesive 7, an epoxy resin, an acrylate resin, or the like can be used. When the adhesive 7 does not have conductivity, the metal thin wire is covered with the adhesive 7 except for the portions to be the external electrode connection portions 15a, 16a, 25a, and 26a. Further, when the adhesive 7 has conductivity, the fine metal wires can be covered with the adhesive 7 also in the portions to be the external electrode connecting portions 15a, 16a, 25a, and 26a.

  Further, the ends of the extended portions 15, 16, 25, 26 of the thin metal wires are attached to the lower transparent insulating base by attaching a commercially available conductive seal 8, for example, Okamoto Co., Ltd. copper foil adhesive tape 7395M from the top. It can also be fixed to the lower end of the material 21 (see FIG. 5).

  Further, the tips of the extended portions 15, 16, 25, and 26 of the fine metal wires can be fixed to the lower end of the lower transparent insulating base material 21 by being sandwiched between the clips 8 together with the lower transparent insulating base material 21. (See FIG. 6). When the clip 8 is not conductive, the metal thin wire is sandwiched between the clips 8 except for the portions to be the external electrode connecting portions 15a, 16a, 25a, and 26a. Further, when the clip 8 has conductivity, the metal thin wire can be sandwiched by the clip 8 also in the portions to be the external electrode connecting portions 15a, 16a, 25a, and 26a.

  Further, a notch groove 9 is put in the end face of the lower transparent insulating base material 21 in advance, and the extending portions 15, 16, 25, 26 are sandwiched between the notched grooves 9, thereby extending the extending portions 15, 15, The tips of 16, 25, and 26 can be fixed to the lower surface end of the lower transparent insulating substrate 21 (see FIG. 7). Further, when the extended portions 15, 16, 25, 26 of the fine metal wires are completely accommodated in the notch groove 9, the fine metal wires can be protected from the impact applied to the side surface of the touch panel. is there. The notch groove 9 may be inclined without being provided perpendicular to the upper and lower surfaces of the lower transparent insulating base material 21.

  In addition, the spacer 3 is formed in a form that can insulate a square bus bar disposed between the upper and lower electrode members, for example, a frame form as shown in FIG. The spacer 3 is formed by printing or applying an appropriate resin such as an acrylic resin, an epoxy resin, or a silicone resin, as well as a resin film similar to the transparent insulating base material. In general, however, the upper electrode member 1 and the lower electrode member 2 are often combined with an adhesive layer made of a double-sided tape in the form of a frame, an adhesive, or an adhesive. Screen printing etc. are used when forming the contact bonding layer which consists of an adhesive agent or an adhesive.

  In addition, this invention is not limited to the said embodiment, It can implement with another various aspect.

  For example, the adhesive 5 may be entirely formed on the lower surface of the lower transparent insulating base material 21 in order to attach the touch panel on a display screen such as an LCD. However, the adhesive 5 is provided with a gap 6 that exposes the external electrode connecting portions 15a, 16a, 25a, and 26a in order to connect to external electrode terminals (see FIG. 10). As the pressure-sensitive adhesive 5, general pressure-sensitive adhesives such as acrylic, urethane, silicon, and epoxy can be used. The pressure-sensitive adhesive 5 may include a core material, and in this case, the pressure-sensitive adhesives on both surfaces of the core material may be the same or different. The pressure-sensitive adhesive 5 may be a permanent type or a re-peeling type. The thickness of the pressure-sensitive adhesive 5 is preferably 15 μm to 150 μm. More preferably, it is 25 micrometers-100 micrometers. As the form of the gap 6, there are a frame type and the like in addition to a hole type and a notch type. Further, if the exposure of the external electrode connecting portions 15a, 16a, 25a, and 26a is limited by the gap 6, insulation from the LCD-side electronic components that are not external terminals to be connected can be reliably maintained.

  Further, it is preferable to apply a conductive adhesive to the gap 6. By applying a conductive adhesive to the gap 6, the tips of the extending portions 15, 16, 25, and 26 of the thin metal wires can be more firmly fixed to the lower surface of the lower transparent insulating substrate 21. Conductive adhesives are made by dispersing conductive fillers such as gold, silver, copper, nickel, aluminum, and carbon in resin binders such as acrylic, urethane, epoxy, and silicon resins. It is desirable to use an adhesive having the same adhesiveness as the adhesive 5 to be formed. For example, if a re-peelable pressure-sensitive adhesive is formed on the entire surface, a re-peelable one is also used as the conductive pressure-sensitive adhesive. Examples of the method for applying the conductive adhesive include screen printing and dropping with a dispenser.

  An ITO film having a thickness of 20 nm was formed by sputtering on a polyester resin film having a length of 37 mm, a width of 52 mm, and a thickness of 188 μm, and the peripheral portion of the ITO film was removed to form a lower transparent electrode. Next, a polycarbonate plate having the same vertical and horizontal dimensions and a thickness of 1 mm was bonded to the surface on which the lower transparent electrode of the film was not provided to obtain a lower transparent insulating substrate. Next, a thin metal wire having a wire diameter of 80 μm made of copper is fixed to two parallel sides of the lower transparent electrode with a conductive paste, and one end of each fine metal wire is 2.5 mm on the outer side of the lower transparent insulating substrate, It extended so that it might become a point symmetry mutually. At this time, the formation width of the conductive paste was 200 μm, and a lower electrode member having a frame portion within 0.5 mm from the end of the lower transparent insulating base material was obtained.

  Further, a polyester resin film having a length and width of the same dimensions as the transparent insulating substrate of the lower electrode member and a thickness of 188 μm is used as the upper transparent insulating substrate of the upper electrode member, and an upper electrode member is obtained in the same manner as the lower electrode member. It was. However, the upper bus bar is arranged to form a square with the lower bus bar of the lower electrode member. Further, the extending direction of the fine metal wires is arranged so that all the extended portions of the fine metal wires are dispersed at the four corners when the lower electrode member and the upper electrode member are arranged to face each other.

  Next, both electrode members were arranged to face each other through an air layer between the electrodes, and both were bonded with a double-sided tape at the peripheral edge.

  Finally, the extended portion of the fine metal wire is bent so as to be in close contact with the side surface and the lower surface of the lower transparent insulating base material, and the tip thereof is fixed to the lower four corners of the lower transparent insulating base material by attaching a conductive seal from above. Thus, an external electrode connection portion was provided, and a highly reliable and easy-to-handle narrow frame touch panel was obtained.

  A narrow frame touch panel having high reliability and easy handling was obtained in the same manner as in Example 1 except that the conductive adhesive was applied by a dispenser instead of applying the conductive seal.

  Moreover, it is the same as that of Example 1 except that a notch groove capable of accommodating a fine metal wire is put in the end face of the lower transparent insulating base material in advance, and an extending portion of the fine metal wire is sandwiched in the notch groove, A narrow frame touch panel with high reliability and easy handling was obtained.

  A pressure sensitive adhesive made of urethane resin is formed on the lower surface of the lower transparent insulating base so as to have a circular hole with a diameter of 1 mm that exposes the external electrode connecting portion over the entire surface, and acrylic in the gap. A narrow frame touch panel having high reliability and easy handling was obtained in the same manner as in Example 1 except that a conductive adhesive in which nickel powder was dispersed in a resin was applied by a dispenser.

It is a figure which shows an example of the state which looked at the touch panel of this invention from the back surface. It is a perspective view which shows the state before the assembly of the touchscreen which concerns on this invention. It is a principal part expansion perspective view which shows the example which fixes the extending part front-end | tip of a metal fine wire to the lower surface edge part of a lower transparent insulation board | substrate in the touchscreen which concerns on this invention from the lower transparent insulation board | substrate side. It is a principal part expansion perspective view which shows the example which fixes the extending part front-end | tip of a metal fine wire to the lower surface edge part of a lower transparent insulation board | substrate in the touchscreen which concerns on this invention from the lower transparent insulation board | substrate side. It is a principal part expansion perspective view which shows the example which fixes the extending part front-end | tip of a metal fine wire to the lower surface edge part of a lower transparent insulating substrate in the touchscreen which concerns on this invention from the lower transparent insulating substrate side. It is a principal part expansion perspective view which shows the example which fixes the extending part front-end | tip of a metal fine wire to the lower surface edge part of a lower transparent insulation board | substrate in the touchscreen which concerns on this invention from the lower transparent insulation board | substrate side. It is a principal part expansion perspective view which shows the example which fixes the extending part front-end | tip of a metal fine wire to the lower surface edge part of a lower transparent insulation board | substrate in the touchscreen which concerns on this invention from the lower transparent insulation board | substrate side. It is a schematic diagram which shows the example which fixes the extending part front-end | tip of a metal fine wire to the lower surface edge part of a lower transparent insulating substrate from the lower transparent insulating substrate side. It is a schematic diagram which shows the example which fixes the extending part front-end | tip of a metal fine wire to the lower surface edge part of a lower transparent insulating substrate from the lower transparent insulating substrate side. It is a figure which shows an example of the state which looked at the touch panel of this invention from the back surface. It is a perspective view which shows the state before the assembly of the touchscreen which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper electrode member 11 Upper transparent insulating base material 12 Upper transparent electrode 13, 14 Upper bus bar 2 Lower electrode member 21 Lower transparent insulating base material 22 Lower transparent electrode 23, 24 Lower bus bar 3 Spacer 4 Dot-shaped spacer 15, 16, 25, 26 Extension part 15a, 16a, 25a, 26a External electrode connection part 5 Adhesive 6 Cavity part 7 Adhesive 8 Clip 9 Notch groove 101 Upper electrode member 111 Upper transparent insulating substrate 112 Upper transparent electrode 113, 114 Upper bus bar 115, 116 Upper routing circuit 102 Lower electrode member 121 Lower transparent insulating base material 122 Lower transparent electrode 123, 124 Lower bus bar 125, 126 Lower routing circuit 103 Spacer 104 Dot spacer 105 Film connector

Claims (5)

A lower electrode member having a lower transparent electrode on a part of the upper surface of the lower transparent insulating substrate and having a pair of lower bus bars on two parallel sides of the lower transparent electrode, and a flexible upper transparent An upper electrode member having an upper transparent electrode on a part of the lower surface of the insulating base and having a pair of upper bus bars on two parallel sides of the upper transparent electrode, and the upper bus bar and the lower bus bar are in a square arrangement In the analog resistive film type touch panel that is opposed to each other through an insulating spacer and bonded at the peripheral edge,
The upper bus bar and the lower bus bar are formed of thin metal wires having a wire diameter of 30 to 100 μm and are fixed to the lower transparent electrode and the upper transparent electrode, respectively, and one end of the thin metal wire is the lower electrode member Are extended to the outside of the surface facing the upper electrode member, and the extended portion is bent so as to be in close contact with the side surface and the lower surface of the lower transparent insulating substrate, and the tip thereof is the lower surface of the lower transparent insulating substrate. A narrow frame touch panel characterized in that an external electrode connecting portion is provided by being fixed to an end portion.   The narrow frame touch panel according to claim 1, wherein the external electrode connection portions are provided at four corners of the lower transparent insulating base material.   A notch groove is provided in the end surface of the lower transparent insulating base material, and the extended portion of the thin metal wire is sandwiched in the notched groove, whereby the tip of the extended portion is the lower end portion of the lower transparent insulating base material. The narrow frame touch panel according to claim 1, wherein the narrow frame touch panel is fixed to the frame.   The narrow frame touch panel according to any one of claims 1 to 3, wherein a pressure-sensitive adhesive having a void portion exposing the external electrode connection portion is formed on the entire lower surface of the lower transparent insulating base material.   The narrow frame touch panel according to claim 4, wherein a conductive adhesive is applied to the gap.

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