JP6168216B2 - Touch panel sensor and touch panel sensor with flexible printed wiring board - Google Patents

Description

  The present invention relates to a touch panel sensor that can prevent peeling of a flexible printed wiring board, disconnection of connection wiring of a flexible printed wiring board, and the like when used in a module together with a flexible printed wiring board.

  Today, touch panels are widely used as input means. In many cases, a touch panel is used together with a display device as an input means for various devices in which a display device such as a liquid crystal display or a plasma display is incorporated (for example, a ticket vending machine, an ATM device, a mobile phone, a game machine). Yes. In such a device, the touch panel is placed on the display surface of the display device, which allows the touch panel to make a very direct input to the display device.

  Various types of touch panels have been put into practical use. Among them, what is called a capacitance method is for touch panel sensors having a layer structure of first transparent electrode / interelectrode insulating layer / second transparent electrode, and for supplying power to the transparent electrodes and outputting detection signals. What has a flexible printed wiring board (henceforth FPC may be connected) connected to the external connection terminal of a touch panel sensor is used (for example, patent documents 1-5). Then, a weak current is passed through the touch panel surface of the touch panel to form an electric field, and the change in capacitance value when a finger or other conductor is lightly touched is converted into a voltage drop or the like and detected. The obtained contact position is output as a signal.

As a touch panel sensor used for a capacitive method, generally, a transparent electrode and an external connection terminal are formed on a pair of opposing substrates (for example, Patent Documents 1 to 4). As another aspect, there is known one in which a transparent electrode and an external connection terminal are respectively formed on both surfaces of a single transparent substrate (hereinafter referred to as a double-sided type touch panel sensor) (for example, Patent Document 5).
The double-sided touch panel sensor has a small number of members, and can improve productivity by reducing the thickness of the touch panel and making it possible to manufacture by a roll-to-roll process. Moreover, since it is not necessary to bond two substrates together, it is possible to avoid problems such as a positional shift between the two transparent electrodes.

JP 2009-64343 A JP-A-9-146680 Japanese Patent No. 2587975 JP 2011-124332 A JP 2011-76514 A

  Here, the double-sided type touch panel sensor and the FPC are usually connected to an external connection terminal formed on one surface and a connection terminal of the FPC by thermocompression bonding via an anisotropic conductive adhesive, and to the other surface. The formed external connection terminal and the connection terminal of the FPC are connected in the same manner as described above. In addition, the double-sided type touch panel sensor having the above configuration is incorporated in a touch panel module (hereinafter sometimes referred to as a module) by connecting the FPC and the drive circuit board, but depending on the design of the module, In some cases, it is necessary to fold all the FPCs arranged on the double-sided type touch panel sensor to one of the surface sides of the double-sided type touch panel sensor and connect them to the drive circuit board.

  However, in this case, there is a problem that the FPC arranged on the surface side of the double-sided type touch panel sensor in the direction opposite to the bending direction is easily peeled off, and the FPC connection wiring is easily broken.

  The present invention has been made in view of the above problems, and when used in a module together with an FPC, the touch panel sensor capable of suppressing disconnection of the FPC connection wiring without causing the FPC to peel off due to bending, And it aims at providing the touch panel sensor with FPC.

  In order to solve the above problems, the present invention provides a transparent film substrate, a front electrode formed on one surface of the transparent film substrate, a front wiring connected to the front electrode, and the transparent film substrate. Connected to the front side external connection terminal connected to the front side wiring, the back side electrode formed on the other surface of the transparent film substrate, and the back side electrode formed on the surface of the front side electrode side of the material A back side wiring, and a back side connector connecting portion formed on the surface of the transparent film base on the back side electrode side, connected to the back side wiring and connected to a driving circuit board of the module, and the transparent The film substrate has a protruding portion that protrudes outward from the outer end of the front-side external connection terminal, and the back-side wiring and the back-side connector connecting portion are formed on the surface of the protruding portion on the back-side electrode side. Made is to provide a touch panel sensor, characterized in that the rear connector connecting portion to an end of the protruding portion is formed.

  According to the present invention, the projection having the back-side connector connection portion and the back-side wiring formed can provide the projection with the same function as the FPC, and the back-side connector connection portion using the projection And the drive circuit board can be connected. Therefore, since the FPC for connecting the back side electrode and the drive circuit board is not used, when used in a module, the FPC is peeled off by bending, and the corners of the transparent film substrate and the wiring electrode of the FPC are contacted. It can be set as the touch panel sensor without the malfunction of disconnection by.

  The present invention provides the above-described touch panel sensor, an insulating flexible substrate, a connection terminal formed on the surface of the flexible substrate and connected to the front external connection terminal, a connection wiring connected to the connection terminal, and the above The front-side external connection terminal and the connection terminal, comprising a flexible printed wiring board having a connector connection portion for connection to the drive circuit board, and an anisotropic conductive adhesive that exhibits adhesiveness and conductivity in the thickness direction by thermocompression bonding There is provided a touch panel sensor with a flexible printed wiring board, characterized by having an anisotropic conductive adhesive layer that connects the two.

  According to the present invention, since the touch panel sensor described above is included, when the touch panel sensor with FPC of the present invention is used for a module, the protruding portion is bent to the front electrode side, and the back side connector connecting portion and the drive circuit board are good. Can be connected to. Further, since the FPC having a separate back-side connector connection portion is not used, it is possible to provide a touch panel sensor with FPC free from problems such as FPC peeling and disconnection due to contact between corners of the transparent film substrate and FPC wiring electrodes. In addition, the front-side external connection terminal and the connection terminal of the FPC can be satisfactorily connected by bending the FPC to the front-side electrode side and connecting it to the drive circuit board.

  The present invention can provide a touch panel sensor and a touch panel sensor with FPC that can suppress disconnection of connection wiring of the FPC without causing separation of the FPC due to bending when used in a module together with the FPC. Has an effect.

It is a schematic plan view which shows an example of the touch panel sensor of this invention. It is a schematic sectional drawing which shows an example of the touch panel sensor of this invention. It is a schematic plan view which shows an example of the touchscreen sensor with FPC of this invention. It is a figure for demonstrating the touchscreen sensor with FPC of this invention. It is explanatory drawing explaining the protrusion part in this invention. It is a schematic plan view which shows the other example of the touchscreen sensor of this invention. It is explanatory drawing explaining the protrusion part in this invention. It is a schematic plan view which shows the other example of the touchscreen sensor of this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is explanatory drawing explaining the cutting part in this invention. It is process drawing which shows an example of the manufacturing method of the touch panel sensor of this invention. It is a schematic plan view which shows an example of the conventional touch panel sensor. It is a figure for demonstrating the conventional touch panel sensor.

  The present invention relates to a touch panel sensor and an FPC-equipped touch panel sensor using the same. Hereinafter, the touch panel sensor and the touch panel sensor with FPC of the present invention will be described.

A. Touch Panel Sensor Hereinafter, the touch panel sensor of the present invention will be described.
The touch panel sensor of the present invention includes a transparent film substrate, a front electrode formed on one surface of the transparent film substrate, a front wiring connected to the front electrode, and the front electrode of the transparent film substrate. A front-side external connection terminal formed on the front surface and connected to the front-side wiring; a back-side electrode formed on the other surface of the transparent film substrate; and a back-side wiring connected to the back-side electrode; and Formed on the surface of the transparent film base on the back side electrode side, connected to the back side wiring, and having a back side connector connection part for connecting to the drive circuit board of the module, the transparent film base is A protrusion protruding outward from the outer end of the front-side external connection terminal, and the back-side wiring and the back-side connector connection are formed on the surface of the protrusion on the back-side electrode side; , Characterized in that the rear connector connecting portion is formed at an end of the protruding portion.

Such a touch panel sensor of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view showing an example of the touch panel sensor of the present invention. 2A is a cross-sectional view taken along line AA in FIG. 1, FIG. 2B is a cross-sectional view taken along line BB in FIG. 1, and FIG. 2C is a cross-sectional view taken along line CC in FIG. is there. As illustrated in FIGS. 1 to 2, the touch panel sensor 10 of the present invention is connected to the transparent film substrate 1 and the front electrode 2 a and the front electrode 2 a formed on one surface of the transparent film substrate 1. Formed on the surface of the transparent film substrate 1 on the surface side electrode 2a side, connected to the surface wiring 3a, and formed on the other surface of the transparent film substrate 1. The backside electrode 2b and the backside wiring 3b connected to the backside electrode 2b and the backside electrode 2b side surface of the transparent film substrate 1 are formed, connected to the backside wiring 3b, and connected to the drive circuit board of the module. The transparent film substrate 1 has a protrusion 11 protruding outward from the outer end of the front-side external connection terminal 4a, and the surface of the protrusion 11 on the back electrode 2b side. On the back side wiring 3b and back connector connecting portion 15b is formed, in which the back connector connecting portion 15b is formed on the ends of the projections 11. Moreover, the front side external connection terminals 4a of the touch panel sensor 10 are usually formed by being arranged in parallel and constitute the front side external connection terminal portion 14a. Moreover, the back side connector connection part 15b is normally comprised from the back side connector connection terminal 5b formed by arranging two or more in parallel.
Moreover, the front side electrode 2a and the back side electrode 2b are formed in the active area 12 that can be visually recognized by the touch panel user, and the front side wiring 3a, the back side wiring 3b, and the front side external connection terminal 4a are outside the active area 12. It is formed in an inactive area. In this example, the front-side electrode 2a and the back-side electrode 2b are composed of the electrode material layer 2X, and the connector connection terminals 5b constituting the front-side wiring 3a, the back-side wiring 3b, the front-side external connection terminal 4a, and the back-side connector connection portion 15b. Is formed by laminating a metal material layer 3X on the same electrode material layer 2X as the electrode material layer 2X constituting the front side electrode 2a and the back side electrode 2b.

  According to the present invention, the projection having the back-side connector connection portion and the back-side wiring formed can provide the projection with the same function as the FPC, and the back-side connector connection portion using the projection And the drive circuit board can be connected. Therefore, since the FPC for connecting the back side electrode and the drive circuit board is not used, when used in a module, the FPC is peeled off by bending, and the corners of the transparent film substrate and the wiring electrode of the FPC are contacted. It can be set as the touch panel sensor without the malfunction of disconnection by.

Here, conventionally, as illustrated in FIG. 23, the touch panel sensor 10 ′ has a front-side external connection terminal 4 a formed on one surface of the transparent film substrate 1 and the other surface of the transparent film substrate 1. And the external connection terminals 4a and 4b and the connection terminals 24 of the FPC 20 are anisotropically bonded as illustrated in FIGS. 24 (a) to 24 (c). By connecting via the layer 30, it is used as a touch panel sensor with FPC. When the touch panel sensor 10 ′ having the FPC 20 is incorporated in a module, both the two FPCs 20 are connected to one surface side (24 (a) of the transparent film substrate 1 as illustrated in FIG. 24 (a). May be bent to the front side electrode 2a side) and connected to the drive circuit board. In this case, a force in the direction opposite to the bending direction (R1 and R2 in FIGS. 24B and 24C) is applied to the connection portions of the external connection terminals 4a and 4b of the touch panel and the connection terminal 24 of the FPC 20. Therefore, the connection portion located on the side of the bending direction as illustrated in FIG. 24B can be connected well, but the side opposite to the bending direction as illustrated in FIG. 24C. There is a problem that the FPC 20 is likely to be peeled off at the connection portion located at. In addition, the FPC 20 is normally formed on the flexible substrate 21, the connection wiring 23 formed on one surface side of the flexible substrate 21, the connection terminal 24, the connector connection terminal 25 (connector connection portion 215), and if necessary. The protective layer 27 for FPC for protecting the connection wiring 23 is provided, and the formation surface of the external connection terminals 4a and 4b of the touch panel and the formation surface of the connection wiring 23 and the like of the FPC 20 are usually opposed to each other. Be placed. Therefore, when the FPC 20 is folded, the surface of the FPC 20 located on the side opposite to the bending direction on the connection wiring 23 side comes into contact with the corner portion of the transparent film substrate 1 of the touch panel sensor 10 ′, thereby the FPC protective layer 27. There is a problem in that the connection wiring 23 may be disconnected even in the case of having the wiring.
Furthermore, since FPC20 is arrange | positioned at the both sides of the transparent film base material 1, there exists a problem that the thickness of the whole touch panel sensor with FPC increases, and workability may fall.
FIG. 23 is a plan view showing an example of a conventional touch panel sensor with FPC, FIG. 24 (a) is a diagram for explaining a conventional touch panel sensor with FPC, and FIG. 24 (b) is a front side view. FIG. 24C is a diagram for explaining the case where the FPC connected to the external connection terminal is bent to the front electrode side, and FIG. 24C is the case where the FPC connected to the back side external connection terminal is bent to the front electrode side. It is a figure for demonstrating. In FIG. 24, the FPC protective layer is omitted for the sake of explanation. 23 and 24 can be the same as those in FIGS. 3 and 4 to be described later, and a description thereof will be omitted here.

On the other hand, the touch panel sensor 10 of the present invention is used as the FPC touch panel sensor 100 by connecting the front side external connection terminal 4a and the connection terminal 24 of the FPC 20 as illustrated in FIG. In this case, as illustrated in FIGS. 4A, 4B, and 4C, the protrusion 11 and the FPC 20 are bent to the front electrode 2a side to be connected to the drive circuit board of the module. Therefore, as illustrated in FIG. 4C, since the FPC for connecting the back electrode 2b to the drive circuit board is not used, the FPC is prevented from peeling when bent to the front electrode side. be able to. Further, it is possible to prevent disconnection due to contact between the corner portion of the transparent film substrate of the touch panel sensor and the connection wiring of the FPC.
Further, the back side wiring 3b for connecting the back side connector connecting portion 15b and the back side electrode 2b is formed on the surface of the protruding portion on the side of the back side electrode 2b, thereby reducing the curvature of the back side wiring 3b when bent. It is possible to reduce the burden on the back side electrode 3b and the like by bending.
Moreover, since it is not necessary to arrange | position FPC in the back side electrode 2b side of the transparent film base material 1, it becomes possible to reduce the thickness of the touchscreen sensor with FPC integrated in a module, and can improve workability. .
3 is a schematic plan view showing an example of the touch panel sensor with FPC of the present invention. FIG. 4A is a diagram for explaining the touch panel sensor with FPC of the present invention, and FIG. These are figures for demonstrating the case where FPC connected with the front side external connection terminal is bent to the front side electrode side, and FIG.4 (c) is for demonstrating the case where a protrusion part is bent to the front side electrode side. FIG. 3 and FIG. 4 will be described in the section “B. Touch panel sensor with FPC” described later, and therefore description thereof is omitted here.

  Hereinafter, the touch panel sensor of the present invention will be described in detail.

I. Transparent film base material The transparent film base material in this invention has the protrusion part mentioned above. Moreover, in the following description, parts other than the protrusion part in a transparent film base material may be called and called a main-body part.

1. Shape of transparent film substrate (1) Protruding portion The protruding portion in the present invention has a shape protruding outward from the outer end of the front external connection terminal. In addition, the inner end of the external connection terminal refers to a portion of the front side external connection terminal that is closest in a substantially vertical direction from the outer peripheral end of the main body, and is indicated by s in FIG. 5, for example. Refers to the position. Note that FIG. 5 is a diagram for explaining a protruding portion in the present invention, and reference numerals not described can be the same as those in FIG.

  It is sufficient that at least one protrusion is formed in the touch panel of the present invention, and a plurality (two protrusions 11 in FIG. 6) may be formed as illustrated in FIG. The number of protrusions and the formation position are appropriately selected depending on the pattern of the front side wiring and the back side wiring. FIG. 6 is a schematic plan view showing another example of the touch panel sensor of the present invention, and the front side electrode and the back side electrode are omitted for explanation.

  As the shape of the protruding portion, the back electrode and the back connector connecting portion can be formed on the surface on the back electrode side, the back connector connecting portion can be formed at the end of the protruding portion, and the protruding portion If it is a shape which can connect the said back side connector connection part and a drive circuit board using A, it will not specifically limit.

  The width of the protrusion is not particularly limited as long as the above-described conditions can be satisfied. Further, the width of the protrusion may be uniform throughout the protrusion 11 as illustrated in FIG. 5, or may be partially different as illustrated in FIG. As the shape of the protrusion 11 when the width of the protrusion 11 is partially different, for example, as illustrated in FIG. 7, the end of the protrusion is larger than the width at the boundary with the main body of the protrusion 11. The shape which provides an inclination so that the width | variety may become wider can be mentioned. By making the protrusion 11 have the above shape, the protrusion 11 can be easily bent. Note that FIG. 7 is a diagram for explaining the protruding portion in the present invention, and reference numerals not described can be the same as those in FIG.

  Specifically, the width of the protrusion is in the range of 1.0 mm to 10.0 cm, in particular in the range of 1.5 mm to 8.0 cm, and particularly in the range of 2.0 mm to 5.0 cm. It is preferable. When the width of the protruding portion is less than the above range, the durability against bending cannot be made sufficient, and the protruding portion may be torn or the backside wiring formed on the protruding portion is broken. This is because there is a possibility that when the width of the protrusion exceeds the above range, the protrusion may be difficult to bend. In addition, about the said width | variety, when the width | variety of a protrusion part changes with the part of a protrusion part, the maximum width shall be pointed out.

The length of the protruding portion is not particularly limited as long as the above-described conditions can be satisfied, but it is 1 cm or more, in particular, in the range of 1.5 cm to 15 cm, particularly in the range of 2.0 cm to 10 cm, and further to 2.0 cm. It is preferable to be within a range of ˜8 cm. This is because if the length of the protruding portion is less than the above range, it may be difficult to sufficiently connect the back-side connector connecting portion and the drive circuit board. The length of the protrusion is appropriately selected depending on the type of module.
The length of the protruding portion is the maximum length in the substantially vertical direction from the outer peripheral end of the main body portion to the end of the protruding portion.

  The shape of the end portion of the protruding portion is not particularly limited as long as it is a shape capable of forming the back side connector connection portion on the surface on the back side electrode side. As illustrated in FIG. Although not shown, it may have a shape with rounded corners.

(2) Main Body Next, the main body will be described. The shape of the main body is not particularly limited as long as it can form the front side electrode and the front side wiring, the front side external connection terminal, the back side electrode and the back side wiring on the surface thereof. It can be appropriately selected according to the pattern, the pattern of each wiring, the use of the touch panel sensor, and the like. In the main body, a region where the front-side electrode and the back-side electrode are formed is used as an active area, and a region where the front-side wiring and the back-side wiring are formed is used as an inactive area.

  Moreover, in this invention, it is preferable to have the cutting part 6 near the boundary of the protrusion part 1 and a main-body part so that it may illustrate in FIG. 8 (a), (b). Here, when a flexible substrate having a relatively high hardness is used as the transparent film substrate in the present invention, when the protrusion is bent and the back side connector connection portion and the drive circuit board are connected, the protrusion portion is particularly Since a force is easily applied to the boundary between the protruding portion and the main body portion, there is a concern that the transparent film substrate may be deformed, cracked, or the like. On the other hand, when there are cut portions on both sides of the protruding portion, the force applied to the boundary can be relaxed, so that the above-described deformation, cracking, etc. of the transparent film substrate can be suppressed. 8A and 8B are schematic plan views showing other examples of the touch panel sensor of the present invention, and the front side electrode and the back side electrode are omitted for explanation.

The cut portion only needs to be formed on at least one side of the protruding portion, but as illustrated in FIG. 8, when the protruding portion 11 is formed between both ends of the main body portion, It is preferable that the cut portions 6 are formed on both sides. This is because the force applied to the transparent film substrate by the above-described bending can be further relaxed. Further, in this case, as illustrated in FIG. 8, the cutting portion is preferably formed at least between the protruding portion 11 and the front side external connection terminal 4 a that are adjacent in plan view. It can suppress that the influence by the bending of the protrusion part mentioned above reaches the transparent film base material of the surface external connection terminal periphery.
Moreover, the touch panel sensor of this invention normally connects the front side external connection terminal formed on one surface of the transparent film base material, and the connection terminal of FPC by thermocompression bonding. At this time, the transparent film substrate in the vicinity of the projecting portion is deformed by heat, causing deflection, and as a result, it becomes difficult to connect the back side connector connecting portion formed at the end of the projecting portion and the drive circuit board. In some cases, there is a concern that air bubbles and foreign substances are likely to be mixed when a cover or a display device is bonded to the touch panel sensor. On the other hand, when the cut portion is formed at the position described above, the transparent film substrate around the front external connection terminal is thermally expanded or heated when the front external connection terminal and the FPC connection terminal are connected by thermocompression bonding. Even if it is a case where it deform | transforms by shrinkage | contraction, it can suppress that the deformation | transformation propagates to the transparent film base material of a protrusion part periphery, and can suppress the deformation | transformation of the film base material of a protrusion part periphery.
Moreover, it is possible to suppress the heat around the front external connection terminal generated by thermocompression from propagating to the transparent film substrate around the protruding portion, and to suppress the thermal deformation of the transparent film substrate around the protruding portion. it can.

  In the present invention, the protrusions and the front-side external connection terminals that are adjacent in a plan view include a front-side wiring, a back-side wiring, and other configurations in a plan view between the protrusions and the front-side external connection terminal. It means not.

  The cutting part is not particularly limited as long as the protruding part can be subjected to a desired bending process. However, when the cutting part is formed between the adjacent protruding part and the front side external connection terminal in plan view, the cutting part is usually The distance from the terminal end to the outer peripheral end of the main body is equal to or greater than the distance from the inner end of the adjacent front side external connection terminal (hereinafter, sometimes referred to as a cut portion adjacent front side external terminal) to the outer peripheral end of the main body. It is. Hereinafter, the cutting part in the case of forming between the protrusion part adjacent on planar view and the front side external connection terminal is demonstrated.

Here, the end of the cut portion and the inner end of the cut portion adjacent front side external connection terminal are the portions where the distance in the substantially vertical direction from the outer peripheral end of the main body portion of the transparent film base is the longest among the cut portions, and the cut This is a portion where the distance in the substantially vertical direction from the outer peripheral end of the main body portion is the longest among the adjacent external connection terminals on the front side.
In addition, the distance from the inner end of the cut portion adjacent front side external connection terminal 4c to the outer peripheral end of the main body portion of the transparent film substrate specifically refers to the distance indicated by a1 in FIGS. The distance from the terminal end of the cutting part 6 to the outer peripheral end of the main body part refers to the distance indicated by b in FIGS. 9 and 10. In addition, the inner end of the cut portion adjacent front side external connection terminal means the end of the main part of the cut portion adjacent front side external connection terminal, for example, in the case of a shape whose width changes in the connection portion with the front side wiring, As shown in FIG. 10 which has already been described, this indicates a portion where the width of the cut portion adjacent front side external connection terminal 4c is constant. Further, when the width of the cut portion adjacent front side external connection terminal is the same as that of the front side wiring, it can be determined from the presence or absence of exposure and the width and length of the connection terminal of the connected FPC.
In addition, about the code | symbol in FIGS. 9-10, since the same member as FIG. 1 etc. is shown, description here is abbreviate | omitted.

As such a cut part, it is a cut part provided in the transparent film base material, and when the front side external connection terminal formed on one surface of the transparent film base material is connected to the FPC by thermocompression bonding In addition, it is not particularly limited as long as it can suppress the occurrence of deflection around the protruding portion, and it may be a cut portion or a notch portion.
In the present invention, it is particularly preferable to use a notch. This is because when the cut portion is a notch portion, thermal deformation and heat propagation around the protruding portion can be effectively suppressed more stably.
In addition, as the notch width when the cut part is a notch part, when the front side external connection terminal formed on one surface of the transparent film substrate is connected to the FPC by thermocompression bonding, the periphery of the protrusion part It is not particularly limited as long as it can suppress the occurrence of deflection in the case. For example, even when the transparent film substrate is thermally expanded by thermocompression bonding, the width is such that the ends of the cut portions do not contact each other. It can be. By setting the above-mentioned width, even when the front-side external connection terminal of the touch panel sensor and the connection terminal of the FPC are connected by thermocompression bonding, even if the transparent film base material of the part expands, the deformation is around the protrusion. This is because it is possible to effectively prevent propagation and to suppress the occurrence of deflection.
A specific notch width is preferably 0.2 mm or more, and more preferably 1.0 mm or more. This is because a sufficient radius of curvature at the tip of the notch can be secured, and cracks that occur when the notch is formed by punching can be reduced.

As a plan view shape when the cut portion is a cutout portion, when the front side external connection terminal formed on one surface of the transparent film base material is connected to the FPC by thermocompression bonding, Although it will not specifically limit if generation | occurrence | production of a deflection | deviation can be suppressed, The rod shape which is illustrated in FIG. 9, FIG. 10 already demonstrated, FIG. 11, FIG. 12 and FIG. 14, FIG. 15, FIG. 16, and FIG.
In the present invention, the width of the portion deeper than the inner end of the cut portion adjacent front side external connection terminal is preferably wider than the width of the portion adjacent to the cut portion adjacent front side external connection terminal. This is because it is possible to effectively suppress the propagation of heat around the cutting portion around the adjacent protruding portion. Moreover, it is because it can be made excellent in intensity | strength by narrowing the width | variety in the site | part adjacent to the cutting part adjacent front side external connection terminal of a cutting part.
In addition, about the code | symbol in FIGS. 11-17, since it shows the member same as FIG. 1, description here is abbreviate | omitted. Further, as the shape where the width of the portion deeper than the inner end of the cut portion adjacent front side external connection terminal is wider than the portion adjacent to the cut portion adjacent front side external connection terminal, specifically, FIG. 13, 16 and 17 can be mentioned. Further, the width indicated by e in the figure indicates the width of the cut portion adjacent to the cut portion adjacent front side external connection terminal, and the width indicated by f is deeper than the inner end of the cut portion adjacent front side external connection terminal. This indicates the width.

The shape in plan view near the terminal end of the cut portion suppresses the occurrence of deflection around the protruding portion when the external connection terminal formed on one surface of the transparent film substrate is connected to the FPC by thermocompression bonding. Although it will not specifically limit if it can be done, it is preferable that it is a shape which does not contain an acute angle part, and it is preferable that it is elliptical shape or circular shape especially. This is because the occurrence of cracks and the like can be reduced from the end of the cut portion.
Specific examples of the shape that does not include the acute angle portion include the already described FIGS. 9, 10, 12, 15, 16, and 17, and the like.

The distance from the terminal end of the cut portion to the outer peripheral end of the main body portion (hereinafter sometimes referred to as the cut portion depth) is the main body of the film base material from the inner end of the adjacent cut portion adjacent front side external connection terminal. The distance is equal to or greater than the distance to the outer peripheral edge of the part (hereinafter, sometimes referred to as the depth of the external connection terminal).
In the present invention, it is preferable that the cut portion depth is deeper than the external connection terminal depth.

In addition, the depth of the cut portion in the present invention is preferably shorter than the length that does not overlap other members in plan view. More specifically, the front side external connection terminal, the front side wiring or the back side wiring adjacent to the cut portion, and the protective layer formed so as to cover the wiring, the front side electrode or the back side electrode are shorter than the length in plan view. Is preferred. This is because it is possible to suppress the occurrence of problems such as the influence of signals transmitted through the wiring, the peeling of the protective layer, and the deterioration of reliability.
Note that the length that does not overlap in plan view with the front-side wiring or the back-side wiring adjacent to the cut portion specifically means that b already described in FIG. 9 is shorter than the length of d1. FIG. 9 shows an example in which the front-side wiring 3 a is close to the cutting part 6.

Specifically, the length of the cut portion depth in the present invention is preferably 1.0 mm or more. This is because the length of the external connection terminal can be made sufficiently long, and the connection reliability between the touch panel sensor of the present invention and the FPC can be made excellent. Among them, in the present invention, it is preferably 2.0 mm or more. This is because sufficient connection reliability can be ensured.
On the other hand, it is preferable that it is 10 mm or less from a viewpoint of size reduction of a touch panel sensor, and it is preferable that it is 5 mm or less especially.

As will be described later, when the cut portion is formed between two adjacent front side external connection terminal portions, the cut portion is connected to two cut portion adjacent front side external connection terminals having different external connection terminal depths. If adjacent, the depth of the external connection terminal shallower than the depth of the depth, that is, the distance from the inner end of the two cut-part adjacent front side external connection terminals to the outer peripheral end of the main body of the film base Is a distance greater than or equal to the distance from the inner end of the short cut portion adjacent front side external connection terminal to the outer peripheral end of the main body of the film base material, the depth of the deep depth of the external connection terminal, That is, the distance between the inner end of the two cut portion adjacent front side external connection terminals and the outer peripheral end of the main body portion of the film base is long from the inner end of the cut portion adjacent front side external connection terminal to the main portion of the film base portion. More than the distance to the outer edge Preferably the distance is, in particular, is preferably a depth greater than the depth of those deep external connection terminal depth. This is because deformation and heat propagation can be effectively suppressed, and the deflection can be reduced.
Note that the depth greater than or equal to the depth of the shallow external connection terminal means that b in FIG. 18 is longer than the length of a2, and the depth of the deep external connection terminal is deep. The depth of more than that means that b in FIG. 18 is longer than the length of a3.

  The distance between the cut portion and the protruding portion is not particularly limited as long as the force applied to the boundary between the protruding portion and the main body portion can be reduced when the protruding portion is bent, but is 10.0 mm. In particular, it is preferably 8.0 mm or less, particularly 5.0 mm or less. This is because if the distance between the cut portion and the protruding portion is less than the above range, the force applied to the boundary may not be sufficiently relaxed. In the present invention, as illustrated in FIG. 19, the cutting portion 6 can be formed so that the cutting portion 6 and the protruding portion 11 do not have a gap.

As an interval between the cut portion and the cut portion adjacent front side external connection terminal, when the front side external connection terminal formed on one surface of the transparent film base material is connected to the FPC by thermocompression bonding, Although it will not specifically limit if generation | occurrence | production of a bending can be suppressed, The terminal width of the said cutting part adjacent front side external connection terminal or the said cutting part adjacent front side external connection terminal and the said cutting part adjacent front side external connection Of the inter-terminal widths with the front-side external connection terminals adjacent to the terminals, it is preferable that they are wider than any narrow one. Even when a positional shift occurs between the connection terminal of the FPC and the external connection terminal of the touch panel sensor of the present invention, the FPC connection terminal can be prevented from overlapping the cut portion. For this reason, it is possible to suppress peeling of the FPC from a portion overlapping with the cut portion in plan view, and it is possible to achieve excellent connection stability with the FPC. Moreover, about the upper limit of the said space | interval in this invention, although it is preferable from a viewpoint that heat transfer becomes small and a deflection | deviation is less, so that a space | interval with a cutting part is wide, FPC connected to the touchscreen sensor of this invention. The size is appropriately set according to the size of the touch panel and the subsequent manufacturing process of the touch panel.
In addition, the distance between the cut portion and the cut portion adjacent front side external connection terminal, the terminal width of the cut portion adjacent front side external connection terminal, the cut portion adjacent front side external connection terminal and the front side adjacent to the cut portion adjacent front side external connection terminal Specifically, the inter-terminal width of the external connection terminal and the interval between the cut portion and the protruding portion are indicated by h, m, n, and o in FIG. Moreover, about the code | symbol in FIG. 20, since it shows the member same as FIG. 20, description here is abbreviate | omitted.

  The distance between the cut portion in the present invention and the cut portion adjacent front-side external connection terminal varies depending on the width of the front-side external connection terminal and the like, specifically, within the range of 0.1 mm to 20 mm. Preferably there is. When the distance is within the above-described range, and more specifically, not less than the above-described lower limit, it is possible to reduce the influence due to the shift of the processing position of the cut portion in the punching process, and to facilitate the processing. Because it can. Moreover, it is because it is easy to connect an external connection terminal and FPC with a sufficient positional accuracy by being below the said upper limit.

In the present invention, the cutting portion is formed at least between the front-side external connection terminal and the projecting portion adjacent in plan view, but is formed at other locations as necessary. For example, it may be formed adjacent to all front side external connection terminals and protrusions.
In the present invention, in particular, when a front-side external connection terminal portion consisting of a plurality of front-side external connection terminals arranged on the same surface of the transparent film substrate is formed, in units of front-side external connection terminal portions. Preferably, it is formed on both sides of all the front side external connection terminal portions and the projecting portions adjacent in the plan view, and particularly on both sides of all the front side external connection terminal portions and the projecting portions. Preferably it is formed. The connection with the FPC is normally performed in units of front side external connection terminal portions. For this reason, it is because generation | occurrence | production of the bending to the transparent film base material of a front side external connection terminal part periphery can be effectively suppressed by forming a cutting part in the unit of a front side external connection terminal part. In addition, by forming on both sides of the front side external connection terminal part, it is possible to suppress the occurrence of deflection to the transparent film base material adjacent to the front side external connection terminal part, and when misaligned to a cover, a display device, etc. This is because generation can be suppressed.
21 shows an example in which a cut portion is formed in units of the front side external connection terminal portion, and FIG. 21A shows the front side external connection terminal portion 14a and the protruding portion 11 that are adjacent in the plan view. FIG. 21B shows an example in which all the front side external connection terminal portions 14a and the protrusions 11 are formed on both sides. Moreover, about the agreement in FIG. 21, since it shows the member same as FIG. 1, description here is abbreviate | omitted. In FIG. 21, description of wirings, electrodes, and the like is omitted for ease of explanation.

As the number formed adjacent to the front side external connection terminal and the protruding portion of the cut portion in the present invention is not particularly limited as long as it is 1 or more, as illustrated in FIG. It may be 2 or more.
In addition, when the configuration of the touch panel sensor is not formed between the cutting portion and the end portion of the main body portion in plan view, as illustrated in FIG. You may form a notch to an edge part.

The method for forming the cut portion in the present invention is not particularly limited as long as it is a method capable of forming a cut portion having a desired shape with high positional accuracy.For example, after forming the electrode, the external connection terminal, and the like, Examples thereof include a method of forming by punching or the like, and a method of patterning using a photolithography method before and after forming the electrode, the external connection terminal, and the like.
In the present invention, the method of forming by punching is particularly preferable. This is because formation is easy.

2. Transparent film base material The transparent film base material in this invention has the protrusion part and main-body part which were mentioned above. In addition, the flexibility of the transparent film substrate is not particularly limited as long as the back-side connector connecting portion formed at the end of the protruding portion and the drive circuit board can be connected by bending the protruding portion described above. Those having flexibility enough to be handled in a roll shape are preferable. This is because roll-to-roll production is possible by handling in a roll shape. Specifically, the flexibility of the transparent film substrate in the present invention means that the transparent substrate is wound around an ABS resin rod having a diameter of 1 mm once, and then the substrate is cracked or chipped by visual confirmation. Say nothing.

The material constituting such a transparent film substrate is not particularly limited as long as it is made of a resin having transparency. Specifically, a polyethylene-based resin such as polyethylene terephthalate (PET), Mention may be made of polyester resins such as polyethersulfone.
Further, the thickness of the transparent film substrate used in the present invention is not particularly limited as long as it can stably support the above electrodes, external connection terminals and the like, but is usually 50 μm to 300 μm. Can be within the range.

The transparent film substrate in the present invention may be composed of a single layer or may be composed of a plurality of layers.
In addition, as a layer laminated | stacked when it consists of multiple layers, a low refractive index layer, a high refractive index layer, etc. can be mentioned besides the layer which consists of said resin which has transparency.

II. Back side connector connection part The back side connector connection part in this invention is formed on the surface by the side of the said back side electrode of the said transparent film base material, and is formed by connecting with the said back side wiring. Moreover, the said back side connector connection part is formed in the edge part of the protrusion part of the transparent film base material mentioned above. Moreover, the said back side connector connection part is used in order to connect the drive circuit board of a module.
The back side connector connection part in this invention may be formed directly on the surface of the said transparent film base material, and may be formed by forming another layer. When the other layer is interposed, specifically, it may be formed on a layer made of an electrode material constituting a back side electrode to be described later.

  Moreover, the said back side connector connection part is normally comprised from the back side connector connection terminal connected to several back side wiring. About the number of the said back side connector connection terminals, it selects suitably according to the pattern etc. of a back side electrode.

  The material constituting the back side connector connection terminal in the present invention is not particularly limited as long as desired conductivity can be obtained. For example, aluminum, silver, copper, or an alloy thereof may be used. it can. Moreover, it is preferable that the said back side connector connection terminal is plated with the metal with high tolerance with respect to oxygen.

The terminal width, thickness and plan view shape of the above-mentioned back side connector connection terminal and the interval between the back side connector connection terminals in the back side connector connection terminal are appropriately determined by the design of the connector part on the drive circuit board side of the module. Yes, it can be the same as a general touch panel sensor.
Specifically, it can be the same as that described in JP2011-210176A.
In addition, on the opposite side (front side) of the electrode of the back side connector connection terminal, there is a reinforcing plate for obtaining an appropriate thickness for providing strength and connection stability that can be sustained when the connector is connected to the drive circuit board of the module. You may prepare.

III. Front side external connection terminal The front side external connection terminal in this invention is formed on the surface in which the said front side electrode of the said transparent film base material was formed, and is connected to the said front side electrode.
Moreover, the front side external connection terminal in this invention may be formed directly on the surface of the said transparent film base material, and may be formed through another layer. Specifically, as illustrated in FIG. 2B described above, the electrode may be formed on a layer made of an electrode material constituting the electrode.

It is preferable that the front side external connection terminal in this invention comprises the front side external connection terminal part which consists of a some external connection terminal arrange | positioned in parallel with respect to the outer peripheral end of the main-body part of a transparent film base material. This is because the touch panel sensor and the FPC can be easily and efficiently connected in units of front side external connection terminal portions.
In addition, about the number of external connection terminals contained in such a front side external connection terminal part etc., it sets suitably according to the heat tool etc. which are used for connection with FPC. The interval between the external connection terminals between the adjacent external connection terminal portions is wider than the interval between the external connection terminals in the external connection terminal portion.

  The distance between the adjacent front-side external connection terminal and the protruding portion in the present invention is not particularly limited as long as the FPC connected to the front-side external connection terminal and the protruding portion do not overlap in plan view. Although it is appropriately determined depending on the form of the touch panel sensor, the form of the drive circuit board, etc., for example, it is preferably 0.2 mm or more, more preferably 1.0 mm or more, and particularly 2. It is preferably within a range of 0 mm or more. This is because, when the above-described interval is within the above range, when the above-described cut portion is formed, the cut portion can be stably formed. Moreover, when the external connection terminal formed on one surface of the transparent film base material is connected to the FPC by thermocompression bonding, the effect that the occurrence of deflection around the protruding portion can be suppressed can be more effectively exhibited. Because.

  The material constituting the external connection terminal in the present invention is not particularly limited as long as desired conductivity can be obtained. For example, aluminum, silver, copper, or an alloy thereof can be used. .

About the terminal width of the said external connection terminal, thickness, and planar view shape, and the space | interval between the external connection terminals in an external connection terminal part can be made to be the same as that of a general touch panel sensor.
Specifically, it can be the same as that described in JP2011-210176A.

IV. Wiring The wiring in the present invention includes at least a front side wiring and a back side wiring. Here, the front side wiring is formed on one surface of the transparent film base material, and the back side wiring is formed on the other surface of the transparent film base material. Further, the front-side wiring is formed so as to be connected to a front-side electrode described later, and is usually formed in the inactive area of the main body portion of the transparent film base material. The back-side electrode is formed so as to be connected to a back-side electrode and a back-side connector connecting portion, which will be described later, and is usually formed continuously in the inactive area and the protruding portion of the main body portion of the transparent film substrate.

  The wiring can be the same as that used for a general touch panel sensor. Specifically, a material made of the same material as the external connection terminal can be used. Further, the line width of such wiring can be set to about 0.03 mm to 0.2 mm. In the present invention, the line width of the back side wiring formed on the protruding portion may be equal to or different from the line width of the back side wiring formed on the main body portion. When the line width is different, for example, the line width of the back side wiring formed in the protruding portion may be formed to be larger than the line width of the back side wiring formed in the main body portion. Thereby, the intensity | strength with respect to the bending of the back side wiring formed in a protrusion part can be made high. Further, for example, the line width of the back side wiring formed in the protruding portion may be formed to be smaller than the line width of the back side wiring formed in the main body portion. Thereby, since the width | variety of the whole protrusion part can be narrowed, a touch panel sensor can be applied to a smaller module. Further, the line width of the front-side wiring and the back-side wiring formed on the main body may be the same or different, but are usually formed with the same line width.

  The material used for the wiring is not particularly limited as long as it has conductivity, and can be the same as the above-described back-side connector connection portion, front-side external connection terminal, and electrode material described later. The wiring formation method can be the same as a general wiring formation method.

V. Electrode The electrode in this invention contains a front side electrode and a back side electrode at least.
Here, the front side electrode is formed on one surface of the transparent film base material, and the back side electrode is formed on the other surface of the transparent film base material. Moreover, an electrode is normally formed in the active area of a transparent film base material.

The material constituting such an electrode is not particularly limited as long as it has desired conductivity, and is a non-transparent material having no transparency even if it is a transparent material having transparency. However, a transparent material is preferable.
As the transparent material in the present invention, those generally used for touch panels can be used. For example, indium tin oxide (ITO), zinc oxide, indium oxide, antimony-added tin oxide, fluorine-added tin oxide, Aluminum-added zinc oxide, potassium-added zinc oxide, silicon-added zinc oxide, metal oxides such as zinc oxide-tin oxide, indium oxide-tin oxide, zinc oxide-indium oxide-magnesium oxide, and metal oxides thereof Examples include materials in which two or more kinds of materials are combined.
Moreover, as a non-transparent material, the thing as described in Unexamined-Japanese-Patent No. 2010-238052 etc. can be used, for example. Specifically, metals such as aluminum, molybdenum, silver, chromium, copper, and alloys thereof can be used.

  About the formation pattern, thickness, etc. of the said electrode, it can be made the same as that of a general touch panel sensor. Specifically, the patterns described in JP2011-210176A and 2011-233514A can be used.

VI. Touch Panel Sensor The touch panel sensor of the present invention includes a transparent film base material, front side electrodes and back side electrodes, and front side external connection terminals and back side connector connection parts, but may have other configurations as necessary. good.
Examples of such other configurations include a protective layer formed so as to cover the electrodes and wiring, and a reinforcing layer that is disposed on the front electrode side of the above-described protrusion and reinforces the protrusion.

The protective layer is not particularly limited as long as it has insulating properties. However, when the protective layer is formed so as to cover the electrode, it is preferable to have transparency.
Examples of the protective layer having insulation and transparency include those made of an inorganic material such as acrylic resin or SiO ₂ .
It is preferable that the protective layer is formed so as to cover at least the back side wiring formed on the surface on the back side electrode side of the protruding portion of the transparent film base, and the front side is provided on both sides of the transparent film base of the touch panel sensor. More preferably, it is formed so as to cover the electrode and the front-side wiring and so as to cover the back-side electrode and the back-side wiring. Moreover, the said protective layer is normally formed in the part except the front side external connection terminal part by the side of the front side electrode of a transparent film base material, and the back side connector connection part by the side of the back side electrode of a transparent film base material.

  The reinforcing layer is not particularly limited as long as it can reduce the load applied to the protruding portion by bending. For example, a film base (flexible plate) obtained by adhering a flexible film base to the front electrode side of the protruding portion using an adhesive or the like can be used. As said film base material, it can be set as a general thing.

The manufacturing method of the touch panel sensor of the present invention is not particularly limited as long as it is a method capable of forming each of the above structures with high accuracy.
Specifically, as illustrated in FIG. 22, a transparent film substrate 1 is prepared, and an electrode material layer 2X made of ITO or the like and a metal material layer 3X made of molybdenum or the like on both surfaces of the transparent film substrate 1 by sputtering. Is prepared (FIG. 22A), a resist 41 is formed in a pattern on the metal material layers 3X on both sides, and then etched with phosphorous acetic acid or the like to form the metal material layer 3X. Then, the electrode material layer 2X is etched using iron chloride or the like using the resist 41 as a mask (FIG. 22B).
Thereafter, the remaining resist is peeled off (FIG. 22 (c)), the resist 41 is applied again to the patterned laminate, the resist 41 in the active area is removed by exposure and development, and the active area is removed with phosphorous acetic acid or the like. The metal material layer 3X inside is etched to form patterned transparent electrodes (2a and 2b) (FIG. 22 (d)), and then the remaining resist 41 is peeled off to remove the electrode material layer 2X and A front-side external connection terminal 4a formed by laminating the metal material layer 3X, a front-side wiring and a back-side wiring (not shown), and a back-side connector connection portion (FIG. 22E) are formed.
Then, the method of obtaining a touch panel sensor by cutting off a transparent film base material in the desired shape which has a protrusion part can be used.

  Applications of the touch panel sensor of the present invention include, for example, a display device with a touch panel, specifically, a liquid crystal display device with a touch panel, an organic electroluminescent display device with a touch panel, and the like. It is preferably used for a display device with a touch panel that is required to be stably connected to an FPC, or to be bonded with a cover, a display device, or the like with high positional accuracy.

B. Next, the touch panel sensor with FPC of the present invention will be described.
The touch panel sensor with FPC of the present invention is formed on the surface of the flexible substrate having the above-described touch panel sensor, insulation, and the flexible substrate, connected to the front external connection terminal, and connected to the connection terminal. An FPC having a connector wiring portion for connecting to the connection wiring and the drive circuit board, and an anisotropic conductive adhesive exhibiting adhesiveness and conductivity in the thickness direction by thermocompression bonding, and the front external connection terminal and the above And an anisotropic conductive adhesive layer for connecting the connection terminal.

  Such a touch panel sensor with FPC will be described with reference to the drawings. FIG. 3 is a schematic plan view showing an example of the touch panel sensor with FPC of the present invention, and FIG. 4 is a diagram for explaining the touch panel sensor with FPC of the present invention. As illustrated in FIGS. 3 and 4, the touch panel sensor with FPC 100 of the present invention includes the touch panel sensor 10, the insulating flexible substrate 21, and the connection formed on one surface of the flexible substrate 21. A flexible printed wiring board 20 having a terminal 24, a connection wiring 23 connected to the connection terminal 24, and a connector connection portion 215 for connecting to a driving circuit board of the module. The back side connection terminal 24 is connected using the anisotropic conductive adhesive layer 30. The connector connection portion 215 is generally configured from a plurality of connector connection terminals 25. Further, the FPC 20 has an FPC protective layer 27 for protecting the connection wiring 23. In FIG. 3 and FIG. 4A, the FPC protective layer is omitted for explanation.

  According to the present invention, since the touch panel sensor described above is included, when the touch panel sensor with FPC of the present invention is used for a module, the protruding portion is bent to the front electrode side, and the back side connector connecting portion and the drive circuit board are good. Can be connected to. Further, since the FPC having a separate back-side connector connection portion is not used, it is possible to provide a touch panel sensor with FPC free from problems such as FPC peeling and disconnection due to contact between corners of the transparent film substrate and FPC wiring electrodes. In addition, the front-side external connection terminal and the connection terminal of the FPC can be satisfactorily connected by bending the FPC to the front-side electrode side and connecting it to the drive circuit board.

The touch panel sensor with FPC of the present invention has at least the above-mentioned touch panel sensor, FPC, and anisotropic conductive adhesive layer.
Hereinafter, each structure of the touch panel sensor with FPC of this invention is demonstrated in detail.
In addition, about the above-mentioned touch panel sensor, since it can be made to be the same as that of the content described in the term of the said "A. touch panel sensor", description here is abbreviate | omitted.

I. FPC
The FPC used in the present invention is formed on the surface of the flexible substrate having insulation properties and the flexible substrate, connected to the front external connection terminal, the connection wiring connected to the connection terminal, and the drive circuit substrate It has a front side connector connection part for connecting with.
As such an FPC, one generally used for connection with a touch panel sensor having electrodes and external connection terminals formed on both sides can be used. For example, it is described in Japanese Patent Application Laid-Open No. 2011-210176. Can be.

Specifically, the flexible substrate in the present invention is not particularly limited as long as it has a desired insulating property, and examples thereof include a flexible polyimide film having a thickness of about 25 μm. it can.
Further, the connection terminal is not particularly limited as long as it has desired conductivity. For example, the connection terminal can be the same as the external connection terminal in the touch panel sensor.
The front-side connector connecting portion is not particularly limited as long as it can be connected to the module drive circuit board, and can be the same as the above-described back-side connector connecting portion.
Further, the connection wiring is not particularly limited as long as it has desired conductivity, and can be the same as the wiring described in the above-mentioned section “A. Touch panel sensor”.

The FPC in the present invention has the above-described configurations, but may have other configurations as necessary.
Examples of such other configurations include a protective layer (FPC protective layer) formed so as to cover the wiring. The protective layer is not particularly limited as long as it has insulating properties, and examples thereof include those made of a polyimide resin.

II. Anisotropic conductive adhesive layer The anisotropic conductive adhesive layer in the present invention is composed of an anisotropic conductive adhesive that exhibits adhesiveness and conductivity in the thickness direction by thermocompression bonding. The connection terminal is connected to the connection terminal.

  As the anisotropic conductive adhesive for forming such an anisotropic conductive adhesive layer, those generally used for touch panels can be used, for example, conductive particles in an adhesive insulating resin. In this case, a paste or a film can be used.

The conductive particles in the present invention are not particularly limited as long as they have a desired conductivity, but the metal particles such as gold, silver and nickel, ceramics, plastics or metal particles are used as the core. Examples thereof include metal coated particles having a metal film such as nickel or gold formed on the surface.
Moreover, as said insulating resin, an epoxy resin etc. can be mentioned, for example.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

[Example 1]
A polyethylene terephthalate (PET) film was used as the transparent film substrate. After depositing ITO (transparent conductive film layer) and molybdenum (metal conductive film layer) on both sides of the PET film, applying a positive photosensitive resin, and patterning by photolithography, first, the metal conductive film layer is made of phosphoric acid, Patterning is performed using an aqueous phosphoric acid acetate solution containing nitric acid, acetic acid, and water in a ratio of 5: 5: 5: 1 as an etching solution, and then using a positive photosensitive resin as a mask, the ITO film is ferric chloride. Were simultaneously patterned as an etchant. The positive photosensitive resin was peeled off with an aqueous potassium hydroxide solution, and the positive photosensitive resin was applied again and patterned by a photolithography method. Thereafter, the metal conductive film layer was patterned using an aqueous phosphoric acid solution as an etchant. Next, the positive photosensitive resin was peeled off with an aqueous potassium hydroxide solution to obtain a touch panel sensor in which electrodes patterned on both sides of the PET film were formed.
A back side connector connection terminal is formed on the surface of one side (back side electrode side) of the transparent film substrate, and one front side external connection terminal is formed on the surface of the other side (front side electrode side). It was formed so as to protrude 60.0 mm outward from the external connection terminal, that is, the distance between the inner end of the back-side connector connection terminal and the outer end of the front-side external connection terminal was 60.0 mm.
Thereafter, the outer shape of the touch panel sensor was punched out. At that time, the outer shape of the touch panel sensor had a convex portion along the protruding back side connector connection terminal, and the inner end of the front side external connection terminal was 2500 μm from the outer peripheral end of the main body of the film base.
In addition, a reinforcing plate was bonded to the opposite side of the back-side connector connection portion on the formation surface of the wiring.

[Example 2]
The method for forming the electrodes of the touch panel sensor and the positions of the back-side connector connection terminal and the front-side external connection terminal are the same as in the first embodiment.
A protective film patterned into a shape to be cut out later was formed on portions other than the back-side connector connection terminal portion and the front-side external connection terminal portion. The method of forming the outer shape is the same as that in the first embodiment.
Further, a reinforcing plate was bonded together in the same manner as in Example 1.

[Comparative example]
In order for the touch panel sensor not to have the protruding part and the back side connector connection part, connect the electrodes so that the position of the front side external connection terminal and the back side external connection part are the same on the front and back from the outer peripheral edge of the main body part of the transparent film substrate Formed. The other electrode formation methods were the same as in Example 1. In this example, the outer shape of the touch panel sensor has a shape without a convex portion.

[Evaluation]
FPC was thermocompression-bonded to the front side external connection terminal of the touch panel sensor produced in the example at a temperature of 130 ° C. via ACF (an anisotropic conductive film which is a film-like anisotropic conductive adhesive). In the comparative example, the FPC is thermocompression bonded to the front external connection terminal of the manufactured touch panel sensor at a temperature of 130 ° C. via the ACF, and then the FPC is thermocompression bonded to the back external connection terminal at a temperature of 130 ° C. via the ACF. Connected. In order to connect to the drive circuit board of the module, the FPC and touch panel sensor transparent film substrate protrusions so that the FPC connected portion is inside in the example, and the front connection terminal side is inside in the comparative example Was bent, and the presence or absence of peeling at the connection portion of the FPC or disconnection of the wiring of the FPC was evaluated.
As a result, in the touch panel sensor of the example, the FPC was not peeled off or disconnected. On the other hand, in the comparative example, partial peeling was observed at the connection portion of the FPC on the back side.

DESCRIPTION OF SYMBOLS 1 ... Transparent film base material 2 ... Electrode 3 ... Wiring 4a ... Front side external connection terminal 4c ... Cutting part adjacent front side external connection terminal 5b ... Back side connector connection terminal 6 ... Cutting part 10 ... Touch panel sensor 11 ... Protrusion part 12 ... Active area 14a ... External connection terminal part 15b ... Back side connector connection part 20 ... FPC
DESCRIPTION OF SYMBOLS 21 ... Flexible board 23 ... Connection wiring 24 ... Connection terminal 40 ... Laminated body 41 ... Resist 100 ... Touch panel sensor with FPC 215 ... Connector connection part

Claims (2)

A transparent film substrate;
A front side electrode formed on one surface of the transparent film substrate and a front side wiring connected to the front side electrode;
A front-side external connection terminal formed on the front-side electrode side surface of the transparent film substrate and connected to the front-side wiring;
A back side electrode formed on the other surface of the transparent film substrate and a back side wiring connected to the back side electrode;
Formed on the back electrode side surface of the transparent film substrate, connected to the back side wiring, and has a back side connector connection part for connecting to the drive circuit board of the touch panel module,
The transparent film substrate has a protruding portion that protrudes outward from the outer end of the front-side external connection terminal, and the back-side wiring and the back-side connector connecting portion are formed on the surface of the protruding portion on the back-side electrode side. The back side connector connecting portion is formed at the end of the protruding portion ,
The touch panel sensor is characterized in that the protruding portion can be bent, and the protruding portion can be bent toward the front side electrode to connect the back side connector connecting portion and the driving circuit board . The touch panel sensor according to claim 1;
Insulating flexible board, connection terminals formed on the surface of the flexible board and connected to the front-side external connection terminals, connection wiring connected to the connection terminals, and connector connection for connection to the drive circuit board A flexible printed wiring board having a portion;
An anisotropic conductive adhesive layer comprising an anisotropic conductive adhesive exhibiting adhesiveness and conductivity in the thickness direction by thermocompression bonding, and connecting the front-side external connection terminal and the connection terminal;
A touch panel sensor with a flexible printed wiring board, comprising:

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