JP6216252B2 - Input device - Google Patents

Description

  The present invention relates to an input device in which a translucent electrode layer is formed of a conductive fine wire such as a metal nanowire or a carbon nanotube.

  Patent Document 1 discloses an invention relating to a capacitive touch panel (input device) that detects the approach position of a finger and detects its operation position.

  In this touch panel, an electrode pattern extending in the X direction and an electrode pattern extending in the Y direction are formed on the same surface of the substrate. The electrode pattern extending in the Y direction has rhomboid electrode units arranged in the Y direction and connection wirings connecting adjacent electrode units. The electrode pattern extending in the X direction has rhombus-shaped electrode units that are separated from each other with the connection wiring therebetween and arranged in the X direction. An insulating layer is formed on the connection wiring, and a bridge wiring for conducting the electrode units arranged in the X direction is formed on the surface of the insulating layer.

  In this touch panel, driving power is sequentially applied to a plurality of electrode patterns extending in the X direction and a plurality of electrode patterns extending in the Y direction. When a finger that is a conductor and is close to the ground potential approaches one of the electrode units, a capacitance is formed between the finger and the electrode unit in addition to the capacitance between the electrode units, and the current flowing through the electrode pattern is reduced. Change. By detecting this change, it is detected which position the finger is approaching on the XY coordinate plane in which the electrode patterns are arranged.

  In the touch panel described in Patent Document 1, a transparent electrode pattern is formed of ITO (Indium Tin Oxide). However, since ITO has a relatively large area resistance, if the area of the touch panel is increased, the electrode pattern routing becomes longer, the electric resistance of each electrode pattern increases, the S / N ratio deteriorates, and the detection sensitivity deteriorates. . Further, since the ITO layer is a relatively fragile electrode layer, cracks and the like are easily formed in the ITO layer when the touch panel is bent.

  Recently, as a translucent electrode pattern replacing ITO, a pattern formed of a conductive fine wire such as a metal nanowire represented by silver nanowire or a carbon nanotube has been considered. A conductive pattern using a conductive fine wire material has a smaller area resistance than that of ITO and can be deformed flexibly, so that a touch panel formed of a film substrate can be curved and arranged.

  However, since the electrode pattern has a structure in which a conductive fine wire is fixed to the surface of the substrate by a resin material called an overcoat or a resin binder, the current capacity per unit width of the electrode pattern is reduced. . As described in Patent Document 1, in the case where a rhombus-shaped electrode unit and a continuous connection wiring are formed, the width dimension of the connection wiring is extremely smaller than the width dimension of the electrode unit. The electrical resistance becomes larger than that of the electrode unit. In this case, if an excessive current is applied to the electrode unit due to discharge caused by static electricity, an extremely large voltage gradient is formed from the electrode unit to the connection wiring, and the current is instantaneously narrow. Concentrate on, and heat concentrates on this part. As a result, there is a risk that the fine wire constituting the connection wiring breaks.

  In order to avoid this risk, the electrode pattern may be a strip pattern having a constant width, but this structure has a limit in increasing the detection sensitivity by reducing the area of the electrode part that generates the electric field. Arise.

  Patent Document 2 discloses a position detection device in which an electrode layer is divided into a plurality of portions. However, since the position detection device described in Patent Document 2 is mounted on a personal computer and does not make the electrode layer translucent, the electrode layer is not formed of a fine wire. The purpose of subdividing the electrode layer in Patent Document 2 is to reduce eddy current loss due to the presence of the electrode layer when used in combination with an electromagnetic induction type detection unit. The technical problem is completely different from the problem related to current capacity.

JP 2010-271796 A JP 2009-162538 A

  The present invention solves the above-mentioned conventional problems, and is formed by forming a translucent electrode layer with a conductive fine wire, and disconnection due to current concentration when an excessive current flows due to discharge or the like. It is an object of the present invention to provide an input device having a structure that makes it difficult to cause a problem.

The present invention provides an input device in which a translucent electrode layer is provided on the surface of a translucent substrate.
The electrode layer has a pair of end portions facing in a first direction, a wiring layer is continuous with at least one end portion, and the electrode layer has a first direction perpendicular to the first direction between the both end portions. A width dimension in the direction of 2 is formed wider than a width dimension in the second direction of the wiring layer;
The electrode layer and the wiring layer are formed integrally and continuously with each other by a conductive fine wire.
The electrode layer has a plurality of branch portions divided by a plurality of slits, and a trunk portion that connects the end portions and continues in the first direction, and each of the slits leaves the trunk portion and leaves the trunk portion. Ri extends to a position to cut the edges of the electrode layer extending to the second direction,
The width dimension in the first direction of the boundary part between the branch part and the trunk part is formed narrower than the width dimension in the first direction of the branch part other than the boundary part. It is.

  In a preferred example of the present invention, the plurality of slits extend linearly and are formed in parallel to each other. However, the slit may be formed in a curved shape or a zigzag shape.

In the input device of the present invention, the electrode layer is formed wider than the width dimension of the wiring layer continuous thereto, and the wide electrode layer is branched into a plurality of branch portions by a plurality of slits. Since the plurality of branch portions are continuous to the trunk portion, when an excessive current due to discharge or the like is applied to any branch portion, the current flows through the trunk portion and flows into the wiring layer. In this current path, the width dimension of the conductive pattern does not change extremely, and the voltage gradient hardly changes between the electrode layer and the wiring layer. Therefore, there is no place where the current is extremely concentrated and there is no portion where the heat is concentrated, and it is easy to suppress the phenomenon that the fine wire material of the wiring layer is burned out due to the heat .

In the present invention, the fine wire is a metal nanowire or a carbon nanotube.
In the input device according to the aspect of the invention, the electrode layer is formed in a symmetric shape toward the second direction across the center line extending in the first direction, and the slit is in the second direction across the trunk. Can be configured as being symmetrically formed. For example, the electrode layer is square.

In the present invention, it is preferable that a width dimension in the first direction of the branching portion at a boundary portion with the trunk portion coincides with a width dimension in the second direction of the wiring layer.
With the above configuration, it is possible to eliminate an extreme difference in the amount of current at a plurality of current concentration portions.

  In the input device of the present invention, for example, a plurality of the electrode layers are connected to each other by the wiring layer.

  In the input device of the present invention, since the electrode layer is formed of a conductive fine wire material, the area resistance is small and the electrode layer is flexible. Therefore, when the substrate is bent, the electrode layer or the wiring layer is formed. Cracks are less likely to occur. Since the electrode layer has a width dimension in the second direction larger than that of the wiring layer, position detection with high sensitivity is possible. In addition, since the electrode layer is separated into a plurality of branch portions by a plurality of slits, when a large current is applied to the electrode layer by discharge or the like, this current can be transferred from the branch portion to the wiring layer via the trunk portion. Therefore, it is possible to prevent the current from being concentrated excessively, and the problem that the fine wire is burned out is less likely to occur.

1 is an exploded perspective view showing an input device according to an embodiment of the present invention; The enlarged plan view which shows the pattern of the electrode layer and wiring layer of the input device of this invention, FIG. 2 is an enlarged view of a cross-sectional view taken along line III-III, An enlarged plan view of the electrode layer and the wiring layer, Explanatory drawing which shows the electrode layer and wiring layer used as a comparative example, The enlarged plan view which shows the electrode layer and wiring layer of the 2nd Embodiment of this invention, The enlarged plan view which shows the pattern of the electrode layer and wiring layer of the input device of the 3rd Embodiment of this invention,

  A portable device 1 is shown in FIG. In the portable device 1, an input device 5 is installed via a shield film 3 in front of the display side of the housing 2. The shield film 3 is obtained by forming a translucent electrode layer such as ITO on a translucent resin sheet such as PET (polyethylene terephthalate). A translucent cover panel 4 is bonded to the front of the input device 5 in the display direction via an optical adhesive, and the surface of the cover panel 4 is an operation surface 4a.

  The input device 5 has one translucent substrate 6. A translucent first conductive pattern 10 and a second conductive pattern 20 are formed on the surface 6a of the substrate 6 facing the operation surface 4a. The translucency in this specification is not limited to pure transparency, and preferably includes, for example, a total light transmittance of 80% or more.

  The board | substrate 6 is comprised from the flexible film-form material, for example, a PET film is used. The first conductive pattern 10 and the second conductive pattern 20 are formed of a translucent conductive film mainly composed of conductive fine wires.

  The fine wire is a metal nanowire, and is composed of one or more selected from Ag, Au, Ni, Cu, Pd, Pt, Rh, Ir, Ru, Os, Fe, Co, and Sn. Silver nanowires are preferably used as the fine wire. The average minor axis diameter of the silver nanowire is greater than 1 nm and 500 nm or less, and the average major axis length is greater than 1 μm and 1000 μm or less.

  In order to improve the dispersibility of the metal nanowires in the nanowire ink forming the translucent conductive film, the metal nanowires are surface-treated with an amino group-containing compound such as PVP and polyethyleneimine, and dispersed with a dispersant. It is applied to the surface 6a of the substrate 6 and fixed by an overcoat of a thermosetting resin such as a transparent thermoplastic resin or epoxy resin. After the resin constituting the overcoat is cured, only the transparent conductive film that forms the first conductive pattern 10 and the second conductive pattern 20 is left by etching or laser processing. Alternatively, a region other than the first conductive pattern 10 and the second conductive pattern 20 may be made nonconductive by nonconductive treatment using fluorination.

  Alternatively, carbon nanotubes are used as the fine wire. The average short axis diameter of the carbon nanotube is larger than 5 nm and 20 nm or less, and the average long axis length is larger than 50 μm and 150 μm or less. The ink in which the carbon nanotubes are dispersed in the dispersant is applied to the surface 6a of the substrate 6, and the dispersant is washed and removed to form a translucent conductive film made of carbon nanotubes. After the translucent conductive film is fixed, only the transparent conductive film that forms the first conductive pattern 10 and the second conductive pattern 20 is left by etching or laser processing.

  As shown in FIG. 2, the first conductive pattern 10 forms a plurality of current paths that are continuous in the Y direction, and the second conductive pattern 10 forms a plurality of current paths that are continuous in the X direction. ing.

  FIG. 4 shows a part of the first conductive pattern 10. In FIG. 4, the first conductive pattern 10 is shown in a direction different from that of FIG. 2 by 90 degrees. In the first conductive pattern 10, the Y direction is the first direction, and the X direction is the second direction.

  In the first conductive pattern 10, a plurality of electrode layers 11 and a wiring layer 15 that connects the respective electrode layers 11 are continuously and integrally formed. FIG. 4 shows a center line Oy that bisects each electrode layer 11 and wiring layer 15 in the Y direction. Each electrode layer 11 has a first end portion 11a on the Y1 side and a second end portion 11b on the Y2 side. The first end portion 11a and the second end portion 11b are located on the center line Oy. The electrode layer 11 has a regular square shape or a rhombus shape, and is symmetrical with respect to the X1 side and the X2 side with the center line Oy interposed therebetween.

  As long as the electrode layer 11 has a symmetrical shape in the X direction across the center line Oy, the electrode layer 11 may be circular or elliptical, or each side of a square as shown in FIG. 4 may be formed with a convex curve. .

  A trunk portion 12 is formed by a part of each electrode layer 11. The trunk portion 12 is a continuous portion without interruption along the center line Oy, and the trunk portion 12 is also continuous with the wiring layer 15. In the electrode layer 11 shown in FIG. 4, the width dimension in the X direction of the trunk portion 12 is uniform over the entire length in the Y direction, and the trunk portion 12 is formed with the same width dimension W as the wiring layer 15.

  As shown in FIG. 4, a plurality of slits 13 are formed in each electrode layer 11. The conductive region formed by the electrode layer 11 is divided by a plurality of slits 13. The slit 13 is formed by removing the conductive fine wire by etching or laser processing, or is formed by making the silver nanowire nonconductive. The slit 13 is linearly formed in the X direction and extends in parallel. The number and arrangement position of the slits are symmetrical on the X1 side and the X2 side across the center line Oy.

  Each slit 13 does not enter the trunk 12 and is formed continuously in a straight line toward the X direction until the trunk 12 is left and the edges of the electrode layer 11 facing the X1 side and the X2 side are cut. ing. The electrode layer 11 is divided into branch portions 14 a, 14 b, and 14 c by slits 13 in a region other than the trunk portion 12. The branch portions 14a, 14b, and 14c are formed symmetrically on the X1 side and the X2 side with the center line Oy interposed therebetween.

  In the electrode layer 11, the first branch portion 14a located at the center in the Y direction has the longest width dimension in the X direction, and the width dimension in the X direction of the pair of second branch portions 14b and 14b located on both sides thereof. Is shorter than the first branch portion 14a. And the width dimension of the X direction of the 3rd branch parts 14c and 14c located in the both ends of a Y direction is the shortest. The length m in the Y direction of the first branch part 14a, the second branch part 14b, and the third branch part 14c is the same.

  A small slit 13 a extending in the Y direction perpendicular to the slit 13 is formed at the boundary between the trunk portion 12 and the respective branch portions 14 a, 14 b, and 14 c of the electrode layer 11. At the boundary between the trunk portion 12 and each of the branch portions 14a, 14b, and 14c, the length dimension p in the Y direction of the base portion of the branch portions 14a, 14b, and 14c is shorter than the length dimension m. The length dimension p in the Y direction of the base portion preferably matches the width dimension W in the X direction of the trunk portion 12 and the wiring layer 15.

  As shown in FIG. 2, each second conductive pattern 20 has a plurality of electrode layers 21. Each electrode layer 21 is formed independently of each other so as to sandwich the first conductive pattern 10. The electrode layer 21 of the second conductive pattern 20 has the same shape as that obtained by rotating the electrode layer 21 of the first conductive pattern 10 by 90 degrees. Each electrode layer 21 is branched into a plurality of branch portions by a plurality of slits 23 extending in the Y direction.

  The electrode layer 21 of the second conductive pattern 20 has a branch portion branched by the slit 23, and coincides with the electrode layer 11 of the first conductive pattern 10 shown in FIG. 4 rotated 90 degrees. . Therefore, the difference in sensitivity between the first conductive pattern 10 and the second conductive pattern 20 can be eliminated or reduced. In the present invention, the slits 23 may not be formed in the electrode layer 21 of the second conductive pattern 20.

  FIG. 3 shows a cross-sectional structure of the intersection between the first conductive pattern 10 and the second conductive pattern 20. At the intersection, an insulating layer 31 is formed on the wiring layer 15 of the first conductive pattern 10, and a bridge wiring layer 32 is formed on the surface thereof. By the bridge wiring layer 32, the electrode layers 21 of the second conductive pattern 20 located on both sides of the wiring layer 15 are made conductive.

  As shown in FIG. 2, the lead-out wiring layer 16 extends integrally from the second end portion 11 b of the electrode layer 11 located on the most Y2 side of the first wiring layer 10. The lead wiring layer 16 has the same width as the wiring layer 15 connecting the electrode layers 11 shown in FIG. 4 and is formed integrally with the electrode layer 11. The lead-out wiring layer 16 is formed of a conductive fine wire, and a conductive layer formed of a low resistance material such as silver is overlaid on the surface thereof.

  The lead wiring layer 26 also extends from the electrode layer 21 located on the most X2 side of the second conductive pattern 20. The structure of the lead wiring layer 26 is the same as that of the lead wiring layer 16. As shown in FIG. 1, on the surface of the substrate 6, a plurality of land portions 17 and 27 are formed at the end portion on the Y2 side. Each of the plurality of land portions 17 is electrically connected to the lead wiring layer 16, and each of the plurality of land portions 27 is electrically connected to the lead wiring layer 26.

  In the input device 5, a capacitance is formed between the first conductive pattern 10 and the second conductive pattern 20. When a finger approaches or comes into contact with the operation surface 4a on the surface of the cover panel 4 by an input operation, the capacitance between the electrode layer 11 of the first conductive pattern 10 and the finger or the electrode of the second conductive pattern 20 The capacitance between the layer 21 and the finger is added, and the total value of the capacitance changes.

  For example, the driving method applies a driving power to each of the first conductive patterns 10 in order for each column, and measures the current values detected from all the second conductive patterns 20, thereby providing a plurality of first conductive patterns 10. It is possible to calculate which one of the conductive patterns 10 is closest to the finger. In addition, by applying driving power to the second conductive pattern 20 in order for each column and measuring the current value detected from all the first conductive patterns 10, a plurality of second conductive patterns are obtained. It can be calculated to which of 20 the finger is closest. By this detection operation, the position on the XY coordinate of the operation location where the finger is in contact with the operation surface 4a of the cover panel 4 can be specified.

  FIG. 5A shows an electrode layer 111 serving as a comparative example and a wiring layer 115 connecting the electrode layer 111. The electrode layer 111 and the wiring layer 115 are formed of conductive fine wires such as metal nanowires and carbon nanotubes, as in the above embodiment. The electrode layer 111 has the same rectangular shape as the electrode layer 11 shown in FIG. 4, but the slit 13 is not formed.

  In this type of input device 5, when an charged object approaches the operation surface 4a, discharge to the electrode layer may occur, and an excessive current may flow through the electrode layer. In the comparative example shown in FIG. 5A, the electrode layer 111 and the wiring layer 115 have extremely different areas, and the electrode layer 111 and the wiring layer 115 have greatly different current capacities. Therefore, when a discharge is applied to the point A ′, an excessive current is generated in the electrode layer 111 having a large area. When this excessive current flows through the wiring layer 115, the concentration of current increases in the wiring layer 115, the wiring layer 115 generates heat, and the fine wire existing in the wiring layer 115 may burn out.

  In the first conductive pattern 10 of the embodiment of the present invention shown in FIG. 4, for example, when discharged to the point A of the electrode layer 11, the current path includes the first point including the point A as indicated by a broken line. It can be predicted that the vehicle passes through the trunk portion 12 from the branch portion 14a and goes to the point B via the wiring layer 15 and the trunk portion 12. The difference between the width dimension m in the Y direction of the branch portion 14a and the width dimension W in the X direction of the trunk portion 12 is sufficiently smaller than the difference between the electrode layer 111 and the wiring layer 115 shown in FIG. Further, the width dimension p of the base portion of the branching portion 14a is narrowed by the small slit 13a, and the width dimension p substantially coincides with the width dimension m of the trunk portion 12. Further, the width dimension W of the trunk portion 12 and the wiring layer 15 are the same.

  Therefore, an extreme difference in current capacity is unlikely to occur in the current path from point A to point B. In particular, since the trunk portion 12 and the wiring layer 15 are current paths having the same width dimension and continuous in the Y direction, current does not concentrate only on the wiring layer 15. Further, the current concentration points are dispersed in a plurality of places such as a portion where the width dimension is narrowed by the small slits 13a. Therefore, it becomes easy to suppress the phenomenon that the wiring layer 15 is heated and the fine wire is burned out.

  Next, the resistance value R0 from point A to point B in the embodiment shown in FIG. 4 is compared with the resistance value R1 of the current path from point A ′ to point B ′ in the comparative example shown in FIG. In this calculation, the area resistance of the translucent conductive layer forming the first conductive pattern 10 shown in FIG. 4 and the area resistance of the translucent conductive layer forming the conductive pattern of the comparative example shown in FIG. Are both Rs. Other dimensions are as described in FIGS. 4 and 5.

(Embodiment shown in FIG. 4)
The resistance value R0 of the current path from point A to point B shown in FIG. 4 is roughly as follows.

  R0 = Rs × L / 2 ÷ m (first branch part 14a) + Rs × 1.5L ÷ W (1.5 pieces of electrode layer 11) + Rs × d ÷ W (wiring layer 15)

  Here, assuming that L = 7 mm, m = 0.5 mm, W = 0.1 mm, and d = 0.2 mm, the calculated value is R0 = 114 × Rs. The resistance value per unit length based on the length along the current path from the point A to the point B (approximately 2 × L) is R0a = 114 × Rs / 14 = 8.14 × Rs.

  On the other hand, the resistance value Rn of the wiring layer 15 alone is Rs × d ÷ W = 2 × Rs. The resistance value per unit length along the current path of the wiring layer 15 is Rna = 2 × Rs / 0.2 = 10 × Rs.

  The ratio of the resistance value Rna per unit length in the wiring layer 15 to the resistance value R0a per unit length of the current path from the point A to the point B is Rna / R0a = 1.23.

(Comparative example shown in FIG. 5)
Next, in the comparative example shown in FIG. 5, in order to calculate the resistance value of the current path from the point A ′ to the point B ′, it is assumed that the hatched region contributes as the resistance value.

  FIG. 5B shows how to obtain the resistance value Rx of the trapezoidal conductor. When the thickness of the conductive layer is t and the resistivity is ρ, the resistance value Rx can be obtained by the following integral formula.

Rx = ∫ [x = 0 → L] {ρ / t / (a + (ba) × (x / L))} dx
When this is calculated,
Rx = Rs × L × ln {(b / a) / (ba)}
However, ln is a natural logarithm.

  The resistance value Rx1 of the left wiring layer 111 shown in FIG. 5 is calculated as two trapezoidal resistors whose width changes from W → L / √2 and whose length becomes L / √2 / 2.

Rx1 = 2 × Rs × L / (√2 / 2) × ln {(L / √2 / W) / (L / √2−W)} = Rs × 5 × ln {(5 / 0.1) / (5-0.1)} = 3.99 × Rs
The resistance value Rx2 of the wiring layer 115 is Rx2 = 2 × Rs.

  The resistance value Rx of the right electrode layer 111 is calculated as two trapezoidal resistors whose width changes from W to L and whose length is L.

Rx3 = 2 * Rs * L * ln {(L / W) (L-W)} = Rs * 14 * ln {(7 / 0.1) (7-0.1)} = 8.62 * Rs
The total resistance R1 is R1 = Rx1 + Rx2 + Rx3 = 14.61 × Rs
If the current path length from the point A ′ to the point B ′ is L + L / √2, the resistance value per unit length in the current path is R1a = 1.218 × Rs.
The ratio of the resistance value Rna per unit length in the wiring layer 15 to the resistance value R1a per unit length of the current path from the point A ′ to the point B ′ is Rna / R1a = 8.21.

(Contrast between embodiment and comparative example)
According to the above estimation, in the embodiment shown in FIG. 4, the probability of current concentration on the wiring layer 15 is (1.23 / 8.21) × 100 (%) = 15 with respect to the comparative example shown in FIG. (%).

The present invention is not limited to the embodiment shown in FIGS. 2 and 4, and various modifications are possible.
First, the same conductive pattern 10 as the first conductive pattern 10 shown in FIG. 4 is rotated 90 degrees to be continuous in the X direction, and the first conductive pattern 10 continuous in the Y direction is provided on both front and back surfaces of the substrate. You may form separately.

  FIG. 6 shows a conductive pattern 210 according to the second embodiment of the present invention. The conductive pattern 210 has a rectangular electrode layer 211 and a wiring layer 215. A plurality of slits 213 are formed in the electrode layer 211, and branch portions 214 a, 214 b, 214 c and a trunk portion 212 are formed in the electrode layer 211.

The length of the slit 213 in the X direction differs depending on the location, and the current path in which the trunk 212 and the wiring layer 215 continuously extend in the Y direction has a width dimension W1 at the center of the trunk 212 in the Y direction. The width dimension W0 is minimized at the center of the wiring layer 215. With this shape, the wiring resistance in the current path in which the trunk 212 and the wiring layer 215 are continuous can be reduced. In this case, W1 / W0 is preferably 5 or less, and more preferably 3 or less.

  FIG. 7 shows a conductive pattern 310 according to the third embodiment of the present invention. Each conductive pattern 310 includes one electrode layer 311 and a wiring layer 315 continuous from the end 311b of the one electrode layer 311. In each conductive pattern 310, each electrode layer 311 has a slit 313 and is branched into a plurality of branch portions.

  In the conductive pattern 310 shown in FIG. 7, the electrode layers 311 are independent one by one, and each electrode layer 311 is individually energized. Therefore, the sensitivity is high and the resolution of the detection output is also high. Also in this conductive pattern 310, the concentration of excessive current at the boundary between the electrode layer 311 and the wiring layer 315 can be suppressed, and the phenomenon that the fine wire material burns out at the boundary can be easily suppressed.

DESCRIPTION OF SYMBOLS 1 Portable apparatus 4a Operation surface 5 Input device 6 Board | substrate 10 1st conductive pattern 11 Electrode layer 11a 1st edge part 11b 2nd edge part 12 Trunk part 13 Slit 14a, 14b, 14c Branch part 15 Wiring layer 20 2nd Conductive layer 21 electrode layer 23 slit 26 wiring layer 111 electrode layer 115 wiring layer 210 conductive pattern 211 electrode layer 212 trunk 214a, 214b, 214c trunk 215 wiring layer 310 conductive pattern 311 wiring layer 313 slit 315 wiring layer X second direction Y first direction

Claims (13)

In an input device in which a translucent electrode layer is provided on the surface of a translucent substrate,
The electrode layer has a pair of end portions facing in a first direction, a wiring layer is continuous with at least one end portion, and the electrode layer has a first direction perpendicular to the first direction between the both end portions. A width dimension in the direction of 2 is formed wider than a width dimension in the second direction of the wiring layer;
The electrode layer and the wiring layer are formed integrally and continuously with each other by a conductive fine wire.
The electrode layer has a plurality of branch portions divided by a plurality of slits, and a trunk portion that connects the end portions and continues in the first direction, and each of the slits leaves the trunk portion and leaves the trunk portion. Extending in the direction of 2 to a position where the edge of the electrode layer is cut ,
The width dimension in the first direction of the boundary part between the branch part and the trunk part is narrower than the width dimension in the first direction of the branch part other than the boundary part. apparatus.   The input device according to claim 1, wherein the plurality of slits extend linearly and are formed in parallel to each other.   The input device according to claim 1, wherein the fine wire is a metal nanowire.   The input device according to claim 1, wherein the fine wire is a carbon nanotube.   The electrode layer is formed symmetrically in the second direction across a center line extending in the first direction, and the slit is formed symmetrically in the second direction across the trunk. The input device according to claim 1.   The input device according to claim 5, wherein the electrode layer has a quadrangular shape. 7. The input device according to claim 1 , wherein a width dimension in a first direction of the branching portion at a boundary portion with the trunk portion is equal to a width dimension in the second direction of the wiring layer. . The input device according to claim 1 , wherein the plurality of electrode layers are connected to each other by the wiring layer. 9. The input device according to claim 1, wherein a width dimension of the wiring layer in the second direction increases from a central portion in the first direction toward an end portion of the electrode layer. The input device according to claim 9, wherein a width dimension of the trunk portion in the second direction increases from an end portion of the electrode layer toward a central portion in the first direction. The input device according to claim 10, wherein a width dimension of the trunk portion in the second direction is larger than a width dimension of the wiring layer in the second direction. The width dimension of the wiring layer in the second direction and the width dimension of the trunk portion in the second direction are continuous from the center portion of the wiring layer in the first direction toward the center portion of the trunk portion in the first direction. The input device according to claim 11, wherein the input device is larger. The ratio W1 / W0 between the second width direction dimension W1 at the center of the trunk portion in the first direction and the second direction width dimension W0 at the center portion of the wiring layer in the first direction is 5 / W0. The input device according to claim 12, wherein:

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