JP5622160B1 - Planar body and touch panel - Google Patents

Abstract

Provided are a planar body and a touch panel that have excellent visibility without depending on the positional accuracy of bonding between substrates and without being affected by contraction of the substrates. A planar body having a plurality of electrodes extending in the same direction on one side of a substrate, each electrode is a polygonal electrode line, and a folding angle between each vertex of the electrode line is: It is set to 40? In the region surrounded by any vertex of one electrode line and two vertices arranged on both sides thereof, adjacent to the first surrounding region that does not overlap with one electrode line on one side of the one electrode line Each electrode extends in a region where an arbitrary vertex of the electrode line is arranged and the second surrounding region surrounded by the vertex of the other electrode line and two vertices arranged on both sides thereof overlaps the first surrounding region. The distance in the direction perpendicular to the direction is set to be larger than 0% and 20% or less with respect to the distance between vertices in one electrode line. [Selection] Figure 6

Description

  The present invention relates to a planar body and a touch panel.

  Conventionally, touch panels are used for display devices such as bank terminals (cash dispensers), ticket machines, personal computers, office automation equipment, electronic notebooks, PDAs, and mobile phones. This touch panel is a sensor that detects where the user touches without disturbing the screen display, and a typical capacitive touch panel is known. A capacitive touch panel is a touch panel that detects a position of a fingertip by detecting a change in capacitance between a human fingertip and an electrode. For example, the one disclosed in Patent Document 1 is known. It has been.

  As shown in FIG. 12, the touch panel disclosed in Patent Document 1 includes two planar bodies 105 and 106 in which electrodes 103 and 104 having a predetermined pattern shape are formed on one surface of substrates 101 and 102, respectively. It is configured by pasting together. The pattern shape of the electrodes 103 and 104 is a structure in which a plurality of rhombus electrode portions 103a and 104a are linearly connected, and the connecting direction of the rhombus electrode portion 103a formed on one substrate 101 and the other substrate The connecting directions of the rhombic electrode portions 104a formed in 102 are orthogonal to each other, and the upper and lower rhombic electrode portions are not overlapped in plan view. Each diamond-shaped electrode part is formed by arranging a plurality of fine metal wires in a lattice pattern.

  As shown in FIG. 13, the touch panel configured in this way has a plurality of uniform lattice patterns composed of a plurality of fine metal wires distributed in the entire touch surface in a plan view. It is said that occurrence of poor visibility can be prevented.

JP 2011-134311 A

  However, in the case of the touch panel described above, there is a possibility that positional displacement of each electrode may occur when two planar bodies on which electrodes having a predetermined pattern shape are formed are overlapped. That is, as indicated by arrows in FIG. 14, a region where fine lattices are densely formed or a region where no lattices are formed occurs, and the uniformity of the lattice pattern is lost, and there is a concern that the visibility of the touch panel may deteriorate. In addition, when the touch panel in which such a positional shift occurs is arranged on a display device such as a ticket vending machine or a personal computer, shading due to the density of the electrodes occurs in a region where fine grids are densely gathered. In order to prevent such a situation from occurring, it is only necessary to increase the positional accuracy (bonding accuracy) at the time of bonding the two planar bodies, but the line width of the fine metal wire constituting the electrode is thin ( For example, 15 μm), it is considered that it is practically difficult to bond the two planar bodies so that the positional deviation does not occur.

  For example, when the electrode on the substrate is formed by a printing technique such as screen printing, the substrate shrinks during the drying process after printing. Since the degree of shrinkage varies depending on various factors such as temperature, humidity, thickness and width of fine metal wires constituting the electrode, and lengths of the electrodes in the longitudinal direction and short direction, it is extremely difficult to control the shrinkage. Moreover, since the longitudinal directions of the electrodes of the planar bodies to be bonded are orthogonal to each other, the contraction of the substrate is caused in each electrode formed on one planar body and the other planar body, respectively. Since the areas where the influence appears remarkably differ, even if the double-sided bodies are bonded with extremely high positional accuracy, the electrodes (diamond-shaped electrode portions) formed on each of the bonded planar bodies overlap in plan view There is also a problem that it is difficult to make a uniform lattice pattern distributed over the entire touch surface without matching. That is, even when a touch panel is manufactured by bonding two planar bodies with high positional accuracy, a lattice pattern shift as shown in FIG. 14 occurs, and there are regions and lattices where fine lattices as shown by arrows are densely packed. There is a possibility that a region that is not formed may occur, and there is a concern about poor visibility of the touch panel.

  In particular, when manufacturing a large touch panel, the amount of contraction of the substrate increases, and therefore the degree of positional deviation between the electrode formed on one substrate and the electrode formed on the other substrate increases. The visibility of the touch panel may be greatly impaired.

  The present invention has been made in order to solve such problems, and does not depend on the positional accuracy of bonding between substrates on which electrodes are formed, and is excellent in that it is not affected by contraction of the substrates. An object is to provide a planar body and a touch panel capable of exhibiting visibility.

  The object of the present invention is a planar body having a plurality of electrodes extending in the same direction on at least one surface side of the substrate, and each electrode has a first vertex and a second vertex repeatedly arranged. The electrode line is a polygonal line, and the folding angle between each of the first vertex and the second vertex of the electrode line is set to 40 ° or more and 70 ° or less, and any first of the electrode lines Adjacent to the first surrounding area that is not overlapped with the one electrode line in the area surrounded by the vertex and the two second vertices arranged on both sides of the first vertex on one side of the one electrode line Arbitrary first vertices in other electrode lines are arranged, and a second surrounding region surrounded by the first vertices in the other electrode lines and two second vertices arranged on both sides of the first vertices; , A region where the first go region overlaps The area is set to be larger than 0% and 20% or less with respect to the distance between the first vertex and the second vertex in the one electrode line with respect to the distance in the direction perpendicular to the direction in which each electrode extends. This is achieved by the planar body being made.

  Moreover, in this planar body, it is preferable that each said electrode wire is a broken line shape which has the same period and the same amplitude.

  The region where the second surrounding region and the first surrounding region overlap is not more than twice the line width in the direction perpendicular to the direction in which each electrode extends at the second vertex of the one electrode line. It is preferable that the distance is set.

  Also, a first imaginary line that extends along a direction perpendicular to the direction in which each electrode extends, passes through any first vertex of the one electrode line, and is perpendicular to the direction in which each electrode extends. It is preferable that the second imaginary line extending in the direction and passing through the first vertex of the other electrode line disposed in the first surrounding region is configured to be separated from each other.

  The distance between the first imaginary line and the second imaginary line is a direction in which the electrodes extend between two second vertices arranged on both sides of the arbitrary first vertex of the one electrode line. The distance is preferably in the range of 15% to 35% of the distance.

  Further, each separation distance between each first virtual line passing through each first vertex of the one electrode line and each second virtual line passing through each first vertex of the other electrode line is, It is preferable that the first vertexes in one electrode line and the first vertexes in the other electrode line are constant in combination.

  Further, the above object of the present invention is achieved by a touch panel including at least one of the above planar bodies.

  According to the present invention, there is provided a planar body and a touch panel that can exhibit excellent visibility without depending on the positional accuracy of bonding between substrates on which electrodes are formed, and without being affected by contraction of the substrates. Can be provided.

It is a schematic structure sectional view showing the state where the touch panel concerning one embodiment of the present invention was installed in the display. It is a schematic structure top view of the 1st planar body with which the touch panel shown in FIG. 1 is provided. It is a schematic structure top view of the 2nd planar body with which the touch panel shown in FIG. 1 is provided. It is a schematic diagram for demonstrating the 1st electrode in the 1st planar body shown in FIG. It is a schematic diagram for demonstrating the 2nd electrode in the 2nd planar body shown in FIG. It is a principal part enlarged plan view for demonstrating the structure of a 1st electrode (2nd electrode). It is a schematic structure top view for demonstrating the modification of the 1st planar body and 2nd planar body which are shown in FIG.2 and FIG.3. It is a graph regarding a sensory test result. It is a principal part enlarged plan view for demonstrating the modification of the 1st planar body and 2nd planar body which are shown in FIG.2 and FIG.3. It is a principal part enlarged plan view for demonstrating the modification of the 1st planar body and 2nd planar body which are shown in FIG.2 and FIG.3. It is a principal part enlarged plan view for demonstrating the modification of the 1st planar body and 2nd planar body which are shown in FIG.2 and FIG.3. It is explanatory drawing for demonstrating the structure of the conventional touch panel. It is a schematic structure top view which shows the conventional touch panel. It is explanatory drawing for demonstrating the problem in the conventional touch panel.

  Hereinafter, actual forms of the present invention will be described with reference to the accompanying drawings. Each drawing is partially enlarged or reduced to facilitate understanding of the configuration, not the actual size ratio.

  FIG. 1 is a schematic sectional view showing a state in which a touch panel according to an embodiment of the present invention is installed in a display device. The touch panel 100 is a capacitive touch panel, and includes a first planar body 1 and a second planar body 2 as shown in FIG. The first planar body 1 and the second planar body 2 are arranged side by side in the vertical direction. As shown in FIGS. 1 and 2, the first planar body 1 includes a first substrate 11 and a first electrode group 12 formed on one surface side of the first substrate 11. The first electrode group 12 is formed as an aggregate of first electrodes 12a having a predetermined shape extending in the same direction. Similarly to the first planar body 1, the second planar body 2 has a second substrate 21 and a second electrode group formed on one surface side of the second substrate 21, as shown in FIGS. 22. The second electrode group 22 is formed as an assembly of second electrodes 22a having a predetermined shape that is different from the direction in which the first electrode 12a extends and extends in the same direction. As shown in FIG. 1, the first planar body 1 and the second planar body 2 are the other surface side of the first electrode group 12 and the second substrate 21 (the surface side where the second electrode group 22 is not formed). Are attached to each other via the adhesive layer 3 so as to be opposed to each other. In addition, when the 1st planar body 1 and the 2nd planar body 2 are piled up, the 1st electrode group so that the direction where the 1st electrode 12a extends and the direction where the 2nd electrode 22a extends orthogonally crosses. 12 and the 2nd electrode group 22 are comprised. Here, the first planar body 1 and the second planar body 2 are bonded via the adhesive layer 3 so that the first electrode group 12 and the second electrode group 22 are spaced apart from each other and face each other. Alternatively, the other surface side of the first substrate 11 (the surface side on which the first electrode group 12 is not formed) and the second electrode group 22 are separated from each other and face each other. 1 and the second planar body 2 may be attached via the adhesive layer 3. Further, for example, the first planar body 1 is configured such that the first electrode group 12 is formed on one side of the first substrate 11 and the second electrode group 22 is formed on the other side, and the second surface The touch panel 100 may be configured by the first planar body 1 alone without using the solid body 2.

  The touch panel 100 having such a configuration is used by being attached to a display device 9 such as a bank terminal (cash dispenser), a ticket vending machine, a personal computer, an OA device, an electronic notebook, a PDA, or a mobile phone. When attaching the touch panel 100, for example, the other surface side (the surface side where the first electrode 12a is not formed) of the substrate of the first planar body 1 is an exposed surface (touch surface). It is attached to the display device 9 through the adhesive layer 4.

  The first substrate 11 and the second substrate 21 are dielectric substrates constituting an insulating layer, and are preferably made of a highly transparent material. For example, polyethylene terephthalate (PET), polyimide (PI), polyethylene naphthalate (PEN), polyethersulfone (PES), polyetheretherketone (PEEK), polycarbonate (PC), polystyrene (PS), polyamide (PA) Flexible films made of synthetic resin such as acrylic, amorphous polyolefin-based resin, cyclic polyolefin-based resin, aliphatic cyclic polyolefin, norbornene-based thermoplastic transparent resin, laminates of these two types, or soda glass It is formed of a glass plate such as alkali-free glass, borosilicate glass, or quartz glass. Although the thickness of the 1st board | substrate 11 and the 2nd board | substrate 21 is not specifically limited, For example, when comprising the 1st board | substrate 11 and the 2nd board | substrate 21 with a synthetic resin flexible film, it is about 10 micrometers-about 2000 micrometers. It is preferable to set it to about 50 μm to 500 μm. Moreover, when the 1st board | substrate 11 and the 2nd board | substrate 21 are comprised with a glass plate, it is preferable to set it as about 0.1 mm-5 mm.

  Moreover, when forming the 1st board | substrate 11 and the 2nd board | substrate 21 from the material which has flexibility, in order to provide rigidity to the said 1st board | substrate 11 and the 2nd board | substrate 21, you may stick a support body. Examples of the support include a glass plate and a resin material having a hardness equivalent to glass, and the thickness is preferably 100 μm or more, and more preferably 0.2 mm to 10 mm.

  As shown in the schematic diagram of FIG. 4, each of the first electrodes 12a constituting the first electrode group 12 has a polygonal electrode line (with a predetermined angle) in which the first vertex T1 and the second vertex T2 are repeatedly arranged. It is configured as a zigzag electrode wire that repeats bending. Similarly, as shown in the schematic diagram of FIG. 5, each second electrode 22a constituting the second electrode group 22 has a polygonal electrode line (predetermined) in which the first vertex T1 and the second vertex T2 are repeatedly arranged. Zigzag electrode wire) that repeats bending at an angle of The electrode wires constituting the first electrode 12a and the second electrode 22a are formed of fine metal wires. Further, the broken line-shaped electrode lines constituting the first electrode 12a are broken line-shaped electrode lines having the same period and the same amplitude, and this electrode line has a single electrode line width and an electrode line pitch. A plurality of repeating patterns are arranged in parallel. Similarly, the broken line-shaped electrode lines constituting each second electrode 22a are also folded line-shaped electrode lines having the same period and the same amplitude, and this electrode line has a single electrode line width and electrode line. A plurality of repeating patterns having a pitch are arranged in parallel. In the present embodiment, the first electrodes 12a constituting the first electrode group 12 are all configured to have the same shape, and the second electrodes 22a constituting the second electrode group 22 are , All have the same shape. More specifically, the shape of the other first electrode 12a adjacent to a certain first electrode 12a moves one first electrode 12a by a predetermined pitch in a direction perpendicular to the direction in which the first electrode 12a extends. The shape is The same applies to the second electrode 22a. Since the first electrode 12a and the second electrode 22a are configured in this way, the line segment connecting the first vertex T1 in each first electrode 12a and the line segment connecting the first vertex T1 in each second electrode 22a. L2 is orthogonal to each other. That is, the direction in which the first electrodes 12a are adjacent to each other and the direction in which the second electrodes 22a are adjacent to each other are perpendicular to each other. In addition, an arbitrary first vertex T1 of the arbitrary first electrode 12a and a first vertex T1 of the other first electrode 12a adjacent to the first electrode 12a, the first vertices arranged close to each other The connecting line segment L3 is parallel to the line segment L2 connecting the first vertices T1 of each second electrode 22a. Similarly, the arbitrary first vertex T1 of the arbitrary second electrode 22a and the first vertex T1 of the other second electrode 22a adjacent to the second electrode 22a, and the first vertices arranged close to each other A line segment L4 connecting the first and second electrodes 12a is parallel to the line segment L1 connecting the first vertices T1.

  Moreover, in order to make the pattern of the 1st electrode 12a and the 2nd electrode 22a hard to see, and to improve the visibility and appearance of the touch panel 100, the 1st electrode 12a and the 2nd electrode 22a are each comprised as follows. preferable. That is, as shown in FIG. 6A, the folding angle θ (inner angle θ) sandwiching each of the first vertex T1 and the second vertex T2 in the electrode line of the polygonal line shape that is the first electrode 12a (second electrode 22a). Is set to 40 ° to 70 °. Further, as shown in FIG. 6B, in an area surrounded by an arbitrary first vertex T11a in one electrode line D1 and two second vertices T21a and T21b arranged on both sides of the first vertex T11a. In the first surrounding region Z1 that does not overlap with the one electrode line D1, any first of the other electrode lines D2 adjacent on one side of the one electrode line D1 (the lower side in FIG. 6B). The vertex T12a is arranged. In addition, when the electrode line shown by the code | symbol D2 in FIG.6 (b) is made into one electrode line, the electrode line D3 arrange | positioned at one side (lower side in FIG.6 (b)) of this electrode line D2 However, it becomes another electrode wire.

  Here, the second surrounding area Z2 surrounded by the first vertex T12a and the two second vertices T22a and T22b arranged on both sides of the first vertex T12a in the other electrode line overlaps the first surrounding area Z1. The region Z3 is a distance K1 between the first vertex T11a and the second vertex T21a (T21b) in one electrode line D1 with respect to the distance in the direction perpendicular to the direction in which each first electrode 12a (second electrode 22a) extends. On the other hand, it is set to be larger than 0% and 20% or less, more preferably 5% or more and 20% or less. In addition, as shown in FIG. 6B, a region Z3 where the second surrounding region Z2 and the first surrounding region Z1 overlap is the first electrode 12a at the second vertex T12a (T12b) of one electrode line D1. It is more preferable to set the distance to be not more than twice the line width W in the direction perpendicular to the direction in which each (second electrode 22a) extends.

  Moreover, it is preferable to comprise so that the line | wire width of the broken line-shaped electrode wire which comprises the 1st electrode 12a and the 2nd electrode 22a may be set to the range of 1 micrometer-30 micrometers, for example. Moreover, it is preferable to comprise so that the amplitude of each broken line electrode line may be in the range of 100 μm to 1000 μm, and more preferably in the range of 150 μm to 500 μm. The period of each broken line electrode line and the electrode line pitch between adjacent first electrodes 12a (electrode line pitch between adjacent second electrodes 22a) constitute the first electrode 12a and the second electrode 22a. It is naturally determined by setting the amplitude of each broken line electrode line and the folding angle θ (inner angle θ) between the first vertex T1 and the second vertex T2 of the folded line electrode line within the above range.

  Note that the first electrode 12a and the second electrode 22a formed as broken line-shaped electrode lines are configured so that the bent angle θ (inner angle θ) is 40 ° or more and 70 ° or less as described above. In such a numerical range, the first electrode 12a and the second electrode 22a may be configured to have the same folding angle θ (inner angle θ), or the first electrode 12a and the second electrode 22a The two electrodes 22a may be configured to have different bending angles θ (inner angles θ). For example, the first electrode line 12a may be configured to have a folding angle θ = 40 °, and the second electrode line 22a may be configured to have a folding angle θ = 70 °. Thus, there is a concern when the touch panel 100 is installed on the display surface of the liquid crystal display device by forming the touch panel 100 so that the first electrode 12a and the second electrode 22a have different folding angles θ. Generation of moire can be effectively suppressed.

  Similarly, as described above, each of the first electrode 12a and the second electrode 22a formed as a polygonal electrode line has a region Z3 where the first surrounding region Z1 and the second surrounding region Z2 overlap each other. With respect to the distance in the direction perpendicular to the direction in which the electrode 12a (second electrode 22a) extends, the overlap ratio with respect to the distance K1 between the first vertex T11a and the second vertex T21a (T21b) in one electrode line D1. Is configured to be larger than 0% and 20% or less, and within such a numerical range, the overlapping ratio of the first surrounding region Z1 and the second surrounding region Z2 in the first electrode 12a The overlapping ratio of the first surrounding region Z1 and the second surrounding region Z2 in the second electrode 22a may be configured to be the same overlapping rate, or may be configured to be different overlapping rates.For example, the first electrode line 12a is configured so that the region Z3 where the first surrounding region Z1 and the second surrounding region Z2 overlap is 5% of the distance K1, and the first surrounding region Z1 and the second surrounding region Z2 The second electrode line 22a may be configured such that the overlapping region Z3 is 20% of the distance K1. In this way, the overlapping ratio of the first surrounding area Z1 and the second surrounding area Z2 in the first electrode 12a is different from the overlapping ratio of the first surrounding area Z1 and the second surrounding area Z2 in the second electrode 22a. Also by forming the touch panel 100, it is possible to effectively suppress the occurrence of moiré that is a concern when the touch panel 100 is installed on the display surface of the liquid crystal display device.

  The first electrode group 12 and the second electrode group 22 formed on the first substrate 11 and the second substrate 21 are formed by, for example, a screen printing method. More specifically, a screen printing plate having openings having a predetermined shape corresponding to the pattern shapes of the first electrode group 12 and the second electrode group 22 is used for the first electrode 12a and the second electrode 22a by a squeegee. The first electrode group 12 and the second electrode group 22 are formed on the first substrate 11 and the second substrate 21 by extruding the conductive ink through the opening. In addition to the screen printing method, the first electrode group 12 and the second electrode group 22 may be formed on the first substrate 11 and the second substrate 21 by various printing methods such as a gravure offset printing method and a nanoimprint method. . Further, instead of using the printing method, the first electrode group 12 and the second electrode group 22 may be formed on the first substrate 11 and the second substrate 21 by photolithography.

  The conductive ink used when forming the first electrode 12a and the second electrode 22a is a fluid in which conductive fine particles are uniformly dispersed in a solvent composed of a resin component and a solvent without aggregation. As an example of the conductive fine particles contained in the fluid, fine particles containing silver as a main component can be given. Further, for example, fine particles mainly containing any one of gold, silver, copper, an alloy of gold and silver, an alloy of gold and copper, an alloy of silver and copper, and an alloy of gold, silver, and copper may be used. Other conductive inks include conductive polymers such as PEDOT (poly-3,4-ethylenedioxythiophene), ultrafine conductive fibers such as carbon nanowires and metal nanowires as conductors. Materials may be used.

  Moreover, the 1st planar body 1 is provided with the some 1st binding part 16a, as shown in FIG. Each of the first binding portions 16a is formed on one surface side of the first substrate 11, and one end of each of the predetermined number (for example, 6 to 12) of the first electrodes 12a adjacent to each other is electrically connected. It is connected to the. Similarly, the 2nd planar body 2 is also provided with the some 2nd binding part 26a, as shown in FIG. Each of the second binding portions 26a is formed on one surface side of the second substrate 21, and one end of each of the predetermined number (for example, 6 to 12) of the second electrodes 22a adjacent to each other is electrically connected. It is connected to the. Further, each of the first binding portions 16a and each of the second binding portions 26a is electrically connected to an external circuit (not shown) for driving a touch panel disposed outside through the lead wires 15 and 25, respectively. Yes. In this way, when a bundle of a plurality of adjacent first electrodes 12a (second electrodes 22a) is used as one detection electrode 10 (20), the resistance value of the detection electrode 10 (20) is lowered. Thus, the position detection sensitivity of the touch panel can be improved. Here, as shown in FIG. 7, it is configured to further include a first binding portion 16b (second binding portion 26b) that is electrically connected to the other end of the first electrode 12a (second electrode 22a). May be. When such a configuration is adopted, the resistance value of each of the detection electrodes 10 (20) in which a plurality of adjacent first electrodes 12a (second electrodes 22a) are configured in a bundle shape is further reduced, and the touch panel The position detection sensitivity can be improved. In addition, for example, even when a part of a certain first electrode 12a (second electrode 22a) is disconnected, a change in capacitance input to the disconnected first electrode 12a (second electrode 22a). The signal is transmitted through the first binding portion 16b (second binding portion 26b) connected to the other end of the first electrode 12a (second electrode 22a) and the other first electrode 12a (second electrode 22a). Since it is transmitted to the first binding part 16a (second binding part 26a) to which the routing wirings 15 and 25 are connected, it becomes possible to detect the touch position stably. Further, in order to improve the position detection accuracy of the touch panel, the first electrode 12a (first electrode) that is not electrically connected to the lead wires 15 and 25 between the adjacent detection electrodes 10 (20) configured in a bundle. Two electrodes 22a) may be provided.

  The first binding portions 16a and 16b and the second binding portions 26a and 26b can be formed by, for example, a screen printing method. Specifically, using a screen printing plate having an opening having a predetermined shape corresponding to the shape of the first binding portions 16a and 16b and the second binding portions 26a and 26b, the conductive ink is passed through the opening by a squeegee. By extruding, the first binding portions 16a and 16b and the second binding portions 26a and 26b are formed on the first substrate 11 and the second substrate 21. In addition to the screen printing method, various printing methods such as an inkjet method, gravure printing, and offset printing may be used. As the conductive ink, the same conductive ink as that used when forming the first electrode group 12 and the second electrode group 22 described above can be used. When the same conductive ink is used, when the first electrode group 12 and the second electrode group 22 are formed by printing or the like, the first binding portions 16a and 16b and the second binding portions 26a and 26b may be formed at the same time. 2, 3 and 7, the first bundling portions 16a and 16b and the second bundling portions 26a and 26b are formed so as to have a rectangular shape in plan view. For example, it may be configured to have a polygonal line shape having a plurality of bending points, or may be configured to have a mesh shape.

  In addition, the formation method of the routing wirings 15 and 25 includes (A) a method of screen-printing a conductive paste containing extremely fine conductive particles on a substrate (see Japanese Patent Application Laid-Open No. 2007-142334, etc.), and (B) copper or the like. Examples include a method of laminating a metal foil on a substrate, forming a resist pattern on the metal foil, and etching the metal foil (see JP 2008-32884 A, etc.).

Examples of the conductive particles in the forming method (A) include fine particles containing silver as a main component. Further, for example, fine particles mainly containing any one of gold, silver, copper, an alloy of gold and silver, an alloy of gold and copper, an alloy of silver and copper, and an alloy of gold, silver, and copper may be used. In addition, indium tin oxide (ITO), conductive oxide in which zinc oxide is mixed with indium oxide (IZO [indium
zinc oxide]), or fine particles mainly composed of conductive oxide (ITSO) in which silicon oxide is mixed with indium oxide. In addition, as another conductive paste, a conductive material using a conductive polymer such as PEDOT (poly-3,4-ethylenedioxythiophene), or a fine conductive fiber such as carbon nanowire or metal nanowire as a conductor. Can be used. In addition, the formation method of a wiring conductor is not limited to the formation method of said (A) (B), Uses printing methods, such as gravure printing other than said (A), and photolithography other than said (B) May be.

  The adhesive layers 3 and 4 may be made of a general transparent adhesive such as epoxy or acrylic, and may include a core made of a transparent film of norbornene resin. Further, the adhesive layer 3 may be formed by overlapping a plurality of sheet-like adhesive materials, and further, a plurality of types of sheet-like adhesive materials may be overlapped. The thickness of the pressure-sensitive adhesive layer 3 is not particularly specified, but is practically preferably 200 μm or less.

  In the touch panel 100 having the above configuration, the touch position detection method is the same as that of the conventional capacitive touch panel 100, and when an arbitrary position on the surface side of the first planar body 1 is touched with a finger or the like, Currents flowing through the detection electrodes 10 (20) each of the detection electrodes 10 (20) configured in a bundle shape from the first electrode 12a (second electrode 22a) are grounded via the capacitance of the human body at the contact position. By detecting the value, the coordinates of the contact position are calculated.

  In the touch panel 100 according to the present invention, the first electrode group 12 and the second electrode group 22 provided in the first planar body 1 and the second planar body 2 that are superimposed on each other are used as an assembly of broken line-shaped electrode wires. Since it comprises, the pattern shape of the 1st electrode group 12 (several 1st electrode 12a) with which the 1st planar body 1 is provided, and the 2nd electrode group 22 (several 2nd with which the 2nd planar body 2 is provided). A mesh assembly that can be viewed from the touch surface side when the first electrode group 12 and the second electrode group 22 are superposed while the pattern shape of the electrodes 22a) is configured to be independent of each other, The meshes of various sizes and shapes can be arranged so as to be distributed substantially uniformly over the entire touch surface. Thus, when one electrode (for example, the first electrode 12a) is formed on the substrate, the formation position of the other electrode (for example, the second electrode 22a) formed on the other substrate is not considered. Since the other electrode (for example, the second electrode 22a) can be formed regardless of the formation position of one electrode (for example, the first electrode 12a), the first planar body 1 and the There is no need to overlap the second planar body 2. That is, the bonding accuracy of the first electrode 12a and the second electrode 22a can be relaxed, and the touch panel 100 can be easily manufactured. In addition, the mesh assembly configured by superimposing the first electrode group 12 and the second electrode group 22 has a configuration in which meshes of various sizes and shapes are arranged substantially evenly distributed over the entire touch surface. Therefore, a region where fine meshes are locally concentrated or a region where no meshes are formed does not occur, and the touch surface is viewed as a uniform appearance when viewed macroscopically.

  In addition, when the first electrode 12a and the second electrode 22a are formed on each substrate (the first substrate 11 and the second substrate 21) and then fired, the first substrate 11 and the second substrate 21 contract. Can occur. However, even when such contraction of the substrates (the first substrate 11 and the second substrate 21) occurs, in the touch panel 100 according to the present invention, a mesh set composed of the first electrode 12a and the second electrode 22a. Since the body has various sizes and shapes of meshes distributed almost uniformly over the entire touch surface, each of the bodies is distributed and arranged by contraction of the substrates (the first substrate 11 and the second substrate 21). Even if the size or shape of the mesh differs from the size or shape assumed at the time of design, there is no effect that the visibility of the touch panel 100 deteriorates. That is, even when the substrates (the first substrate 11 and the second substrate 21) contract, good visibility can be maintained. In addition, in this touch panel 100, since the contraction of the substrates (the first substrate 11 and the second substrate 21) does not affect the visibility, each electrode 12a, 22a is attached by a printing method such as a screen printing method. When forming on each board | substrate 11 and 21, it is not necessary to consider that each board | substrate 11 and 21 shrink | contracts, and manufacture of the 1st planar body 1 and the 2nd planar body 2 becomes easy.

  Further, in the touch panel 100 according to the present invention, the first electrode 12a and the second electrode 22a are each composed of a polygonal electrode line having the same period and the same amplitude. Accordingly, regarding the mesh of electrodes formed by overlapping the plurality of first electrodes 12a and the plurality of second electrodes 22a, the meshes distributed over the entire touch surface are set to approximately the same shape and size. Therefore, the visibility of the touch panel 100 can be improved.

  In addition, since the pattern shapes of the plurality of first electrodes 12a and the second electrodes 22a are each formed by a repeating pattern having a single electrode line width and electrode line pitch, the shape of each mesh distributed over the entire touch surface Further, the size of the touch panel 100 can be set to the same level (uniform), and the visibility of the touch panel 100 can be further improved.

  Further, in the present invention, as described above, the bending angle θ (inner angle θ) sandwiching each of the first vertex T1 and the second vertex T2 in the electrode line of the polygonal line shape that is the first electrode 12a (second electrode 22a). Is set to 40 ° or more and 70 ° or less. Further, in the first surrounding area Z1, an arbitrary first vertex T12a of another electrode line D2 adjacent on one side of the one electrode line D1 (lower side in FIG. 6B) is arranged. The region Z3 in which the second surrounding region Z2 and the first surrounding region Z1 overlap each other in the one electrode line D1 with respect to the distance in the direction perpendicular to the direction in which each first electrode 12a (second electrode 22a) extends. The distance K1 between the first vertex T11a and the second vertex T21a (T21b) is set to be greater than 0% and 20% or less. With such a configuration, the pattern shape of the first electrode group 12 (second electrode group 22) configured by the first electrode 12a (second electrode 22a) can be made significantly less visible, and the appearance of the touch panel can be improved. Can be made good.

  The inventor of the present invention conducts a sensory test for confirming that the configuration of the present invention exerts an effect that the pattern shape of the first electrode group 12 (second electrode group 22) can be significantly difficult to visually recognize. It was. The contents and results of this test are shown below.

  The test contents were prepared by preparing various samples related to the first planar body 1 and visually determining whether or not the pattern shape of each sample is conspicuous (good or bad visibility) under a normal indoor fluorescent lamp. In the determination, each of a plurality of examiners scored 0 points for poor visibility, 0.5 points for relatively good ones, and 1 point for good ones. The sensory test results for each sample were quantified by calculating the average value. That is, the sensory test result score of the sample judged by all the testers to be poor in visibility is 0 point, and the sensory test result score of the sample judged by all the testers to be good in visibility is 1 point. Become.

  First, a preferable range of the angle θ when the bending angle θ (inner angle θ) sandwiching the first vertex T1 (second vertex T2) of the electrode line of the polygonal line shape that is the first electrode 12a (second electrode 22a) is changed. In order to confirm the above, samples A to C shown in Table 1 were prepared and subjected to sensory evaluation.

ここで、表１中の角度は、第１頂点Ｔ１（第２頂点Ｔ２）を挟む折れ角度θ（°）に対応する。また、振幅、電極線ピッチ、周期は、図４において示す振幅、電極線ピッチ、周期に対応する。なお、振幅、電極線ピッチ、周期のそれぞれの単位は、μｍである。また、重なり（％）は、上述した第２囲繞領域Ｚ２と第１囲繞領域Ｚ１とが重なり合う領域Ｚ３の、上記距離Ｋ１に対する割合を百分率表記したものに対応する。なお、サンプルＡ〜Ｃにおける第１電極１２ａの線幅は、１５μｍに設定している。

Here, the angle in Table 1 corresponds to a folding angle θ (°) sandwiching the first vertex T1 (second vertex T2). The amplitude, electrode line pitch, and period correspond to the amplitude, electrode line pitch, and period shown in FIG. Each unit of amplitude, electrode line pitch, and period is μm. The overlap (%) corresponds to the percentage of the area Z3 where the second surrounding area Z2 and the first surrounding area Z1 overlap with respect to the distance K1. The line width of the first electrode 12a in the samples A to C is set to 15 μm.

  The sensory test results for these samples A to C are shown in Table 2. Moreover, what plotted the sensory test result about sample AC on the graph which made the horizontal axis the angle (degree) and made the vertical axis | shaft a score is shown in FIG. In FIG. 8, an approximate curve by a quadratic function is written.

表１及び表２から、角度（°）が４５°〜５３°であり、重なり（％）が１０％〜１２％となる第１面状体は、点数が１、或いは、１に極めて近い値であることから、極めて視認性が良好なものであることが分かる。また、図８に示すグラフから、角度θ（°）が４０°以上７０°以下の範囲に設定すれば、官能試験結果点数が極めて高い値を示すと考えられ、良好な視認性を得られることが推測される。

From Tables 1 and 2, the first planar body having an angle (°) of 45 ° to 53 ° and an overlap (%) of 10% to 12% has a score of 1 or a value very close to 1. Therefore, it can be seen that the visibility is extremely good. In addition, from the graph shown in FIG. 8, if the angle θ (°) is set in the range of 40 ° or more and 70 ° or less, it is considered that the sensory test result score shows a very high value, and good visibility can be obtained. Is guessed.

  Next, the folding angle θ (inner angle θ) sandwiching the first vertex T1 (second vertex T2) of the first electrode 12a (second electrode 22a) in the broken line-shaped electrode line is set to 45 °, and the overlap (%) In order to confirm the preferable range of overlap (%) when the degree was changed, samples D to G shown in Table 3 were prepared and subjected to sensory evaluation.

なお、サンプルＤ〜Ｇにおける第１電極１２ａの線幅は、１５μｍに設定している。これらサンプルＤ〜Ｇについての官能試験結果を表４に示す。

The line width of the first electrode 12a in the samples D to G is set to 15 μm. The sensory test results for these samples D to G are shown in Table 4.

表３及び表４に示すサンプルＦ及びＧの結果から、重なり（％）が、０％よりも大きく１２％以下となる第１面状体は、視認性が良好なものであることが分かる。また、サンプルＥの官能試験結果点数が０．３点であり、サンプルＦの官能試験結果点数が０．９点であることを勘案すると、重なり（％）が、３３％（サンプルＥ）と１２％（サンプルＦ）との間に、視認性が良好であるか否かの境界が存在すると考えられ、その境界となる重なり（％）は、両者の算術平均より２２．５％程度であると考えられる。したがって、重なりが、２０％以下であれば、良好な視認性が得られると考えられる。

From the results of Samples F and G shown in Tables 3 and 4, it can be seen that the first planar body in which the overlap (%) is greater than 0% and equal to or less than 12% has good visibility. Considering that the sensory test result score of sample E is 0.3 and the sensory test result score of sample F is 0.9, the overlap (%) is 33% (sample E) and 12 % (Sample F) is considered to have a boundary of whether or not the visibility is good, and the overlap (%) as the boundary is about 22.5% from the arithmetic average of both. Conceivable. Therefore, it is considered that good visibility can be obtained when the overlap is 20% or less.

  Next, the folding angle θ (inner angle θ) sandwiching the first vertex T1 (second vertex T2) in the polygonal electrode line that is the first electrode 12a (second electrode 22a) is 90 °, and the overlap (%) In order to confirm a preferable range of overlap (%) when the degree was changed, samples H to J shown in Table 5 were prepared and subjected to sensory evaluation.

なお、サンプルＨ〜Ｊにおける第１電極１２ａの線幅は、１５μｍに設定している。これらサンプルＨ〜Ｊについての官能試験結果を表６に示す。

Note that the line width of the first electrode 12a in the samples H to J is set to 15 μm. The sensory test results for these samples H to J are shown in Table 6.

表５及び表６から、折線形状の電極線における第１頂点Ｔ１（第２頂点Ｔ２）を挟む折れ角度θ（内角θ）が９０°の場合には、重なり率を変化させても視認性が良好とはならず、いずれの場合も視認性が悪いという結果となった。また、上記の折線形状の電極線における第１頂点Ｔ１（第２頂点Ｔ２）を挟む折れ角度θ（内角θ）が４５°の場合の結果（表３及び表４）と合わせて考察すると、視認性を良好なものとするためには、電極線における第１頂点Ｔ１（第２頂点Ｔ２）を挟む折れ角度θ（内角θ）を９０°よりも小さい範囲に設定する必要があると考えられる。

From Tables 5 and 6, when the folding angle θ (inner angle θ) sandwiching the first vertex T1 (second vertex T2) of the broken line electrode wire is 90 °, the visibility is improved even if the overlapping rate is changed. It was not good, and in all cases the visibility was poor. Further, when considering together with the results (Table 3 and Table 4) when the bending angle θ (inner angle θ) sandwiching the first vertex T1 (second vertex T2) in the above-described broken line-shaped electrode wire is 45 °, it is visually In order to improve the property, it is considered necessary to set the folding angle θ (inner angle θ) between the first vertex T1 (second vertex T2) of the electrode line to a range smaller than 90 °.

  As mentioned above, although one Embodiment of the touch panel 100 which concerns on this invention was described, a specific structure is not limited to the said embodiment. For example, in the detection electrode 10 (20) configured with a predetermined number (for example, 6 to 12) of adjacent first electrodes 12a (second electrodes 22a) as one bundle, as shown in FIG. A plurality of first bridge portions 18 (second bridge portions 28) that connect adjacent first electrodes 12a (second electrodes 22a) may be provided. By providing such a first bridge portion 18 (second bridge portion 28), a part of one first electrode 12a (second electrode 22a) constituting each bundle-like detection electrode 10 (20) is disconnected. Even in this case, the capacitance change signal (touch signal) input to the disconnected first electrode 12a (second electrode 22a) passes through the first bridge unit 18 (second bridge unit 28). Thus, it can be transmitted to the other first electrode 12a (second electrode 22a) and guided to an external circuit (not shown) for driving a touch panel disposed outside, and the touch position can be detected stably. It becomes possible.

  As shown in FIG. 9A, the first bridge portion 18 (second bridge portion 28) may be configured as a linear wiring type that connects adjacent first electrodes 12a (second electrodes 22a). it can. Here, the first bridge portion 18 (second bridge portion 28) of such a wiring type is preferably configured to have the same line width as that of the first electrode 12a (second electrode 22a). . As a method of forming the wiring type first bridge portion 18 (second bridge portion 28), it can be formed by various printing methods such as a screen printing method, a gravure offset printing method, and a nanoimprint method. Further, instead of using the printing method, the first bridge portion 18 (second bridge portion 28) may be formed by photolithography. In addition, although it is preferable to form the 1st bridge | bridging part 18 (2nd bridge | bridging part 28) simultaneously with the 1st electrode group 12 (2nd electrode group 22), you may form at a different timing.

Further, as the first bridge portion 18 (second bridge portion 28), in addition to the wiring type, as shown in FIG. 9B, a dot type (for example, a circular film body in plan view) is adopted. Also good. In the case where such a dot-type first bridge portion 18 (second bridge portion 28) is configured, it is preferably formed of a transparent conductive ink from the viewpoint of making it less noticeable. Transparent conductive ink includes indium tin oxide (ITO), conductive oxide in which indium oxide is mixed with zinc oxide (IZO [indium
Zinc oxide]), or a fluid in which fine particles mainly composed of conductive oxide (ITSO) in which indium oxide is mixed with silicon oxide are uniformly dispersed in a solvent composed of a resin component and a solvent can be used. . Examples of the transparent conductive material used for forming the other first bridge portion 18 (second bridge portion 28) include conductive polymers such as PEDOT (poly-3,4-ethylenedioxythiophene), carbon nanowires, and the like. In addition, a conductive material having an ultrafine conductive fiber such as metal nanowire as a conductor can be used. The dot-type first bridge portion 18 (second bridge portion 28) can be formed by various printing methods such as screen printing, gravure printing, offset printing, and ink jet printing. Further, the dot shape of the dot type bridge portion is not limited to a circular shape in plan view, and may be, for example, a square shape in plan view or an elliptical shape in plan view.

  The number of the first bridge portions 18 (second bridge portions 28) formed in the detection electrodes 10 (20) configured in a bundle shape is the first electrode 12a ( The resistance of the second electrode 22a), the shape of the first electrode 12a (second electrode 22a), and the like may be taken into consideration so as not to impair visibility.

  Moreover, in the said embodiment, as shown in FIGS. 4-6, the other 1st electrode 12a (2nd electrode 22a) adjacent to the 1st 1st electrode 12a (2nd electrode 22a) comprised as a broken line-shaped electrode wire. The shape of the two electrodes 22a) is such that one first electrode 12a (second electrode 22a) is parallel by a predetermined pitch (electrode line pitch) in a direction perpendicular to the direction in which the first electrode 12a (second electrode 22a) extends. Each of the first electrodes 12a (second electrodes 22a) constituting the first electrode group 12 (second electrode group 22) is configured to have the same shape. However, the present invention is not limited to such a configuration. For example, as shown in FIG. 10, the electrode extends in a direction perpendicular to the direction in which each first electrode 12a (second electrode 22a) extends, and has a broken line shape. One first electrode 12a (second electrode) configured as a line 2a) extends along a direction perpendicular to the first virtual line L5 passing through the arbitrary first vertex T11a and the direction in which each first electrode 12a (second electrode 22a) extends, and enters the first surrounding region Z1. Each of the first electrodes 12a (second electrodes 22a) is separated from the second virtual line L6 passing through the first vertex T12a of the other first electrodes 12a (second electrodes 22a) to be arranged without overlapping each other. ) May be configured. Here, the separation distance K2 between the first virtual line L5 and the second virtual line L6 is an arbitrary first vertex T11a in one first electrode 12a (second electrode 22a) configured as a broken line-shaped electrode line. It is preferable that the distance between the two second vertices T21a and T21b arranged on both sides is in the range of 15% to 35% of the distance K3 in the extending direction of each first electrode 12a (second electrode 22a). .

  Further, as shown in FIG. 11, each first virtual line L5 passing through each first vertex T11a in one first electrode 12a (second electrode 22a) configured as a broken line-shaped electrode line, and this one Each separation distance K2 from each second virtual line L6 passing through each first vertex T12a in the other first electrode 12a (second electrode 22a) arranged on one side of the first electrode 12a (second electrode 22a) is The first apex T11a in the first electrode 12a (second electrode 22a) and the first apex T12a in the other first electrode 12a (second electrode 22a) are configured to be constant. That is, the first vertex (second vertex) in the direction in which the first electrode 12a (second electrode 22a) extends between the first electrodes 12a adjacent to each other (between the second electrodes 22a adjacent to each other). Formation It is more preferable to configure the amount of deviation of position so as to be constant.

  Even when each first electrode 12a (second electrode 22a) is configured as shown in FIG. 10 and FIG. 11, the same effect as described above, that is, the effect on the first substrate 11 (second substrate 21). The first electrode 12a (second electrode 22a) is not dependent on the position accuracy of the first electrode 12a (second electrode 22a) or the position accuracy regarding the bonding of the first planar body 1 and the second planar body 2. ), It is possible to obtain a touch panel with a good appearance that is difficult to visually recognize.

  The inventor of the present application sets the distance K2 between the first virtual line L5 and the second virtual line L6 to two second vertices T21a arranged on both sides of an arbitrary first vertex T11a in one first electrode 12a. , T21b, a sample product related to the first planar body 1 set to 25% of the distance K3 in the direction in which each first electrode 12a extends is prepared, and a sensory test similar to the above is performed. It has been confirmed that the first planar body 1 exhibits a good appearance. The sensory test result score was 0.7. Further, in the sample product, the line width of the first electrode 12a configured as a broken line-shaped electrode line is 15 μm, and the folding angle θ sandwiching each of the first vertex T1 and the second vertex T2 is 45 °. The period was set to 246 μm and the amplitude was set to 340 μm. The electrode line pitch between the adjacent first electrodes 12a was set to 300 μm. Further, the region where the second surrounding region Z2 and the first surrounding region Z1 overlap is the first region of the first electrode 12a (electrode line) with respect to the distance in the direction perpendicular to the direction in which each first electrode 12a extends. The distance between the first vertex T1 and the second vertex T2 (the amplitude of the first electrode 12a: 340 μm) was set to 12%.

  Further, as shown in FIGS. 10 and 11, when the first electrode 12a (second electrode 22a) is configured such that the first virtual line L5 and the second virtual line L6 are spaced apart from each other, they are adjacent to each other. It becomes possible to set the length of the first bridge portion 18 (second bridge portion 28) connecting the matching first electrodes 12a short. When the first bridge portion 18 (second bridge portion 28) is provided, the first planar body 1 (second planar body 2) due to the presence of the first bridge portion 18 (second bridge portion 28). However, since the length of the first bridge portion 18 (second bridge portion 28) can be shortened, it is possible to effectively suppress the decrease in light transmittance.

DESCRIPTION OF SYMBOLS 100 Touch panel 1 1st planar body 11 1st board | substrate 12 1st electrode group 12a 1st electrode 15 Lead wiring 16 1st binding part 18 1st bridge part 2 2nd planar body 21 2nd board | substrate 22 2nd electrode group 22a Second electrode 25 Lead wiring 26 Second binding portion 28 Second bridge portion 3 Adhesive layer 4 Adhesive layer T1 First vertex T2 Second vertex

Claims (7)

A planar body comprising a plurality of electrodes extending in the same direction on at least one surface side of the substrate,
Each of the electrodes is a polygonal electrode line in which a first vertex and a second vertex are repeatedly arranged, and a folding angle between each of the first vertex and the second vertex of the electrode line is 40 ° or more and 70. Is set to
In a region surrounded by an arbitrary first vertex of the one electrode line and two second vertices arranged on both sides of the first vertex, the first surrounding region not overlapping the one electrode line, Arbitrary first vertices in other electrode lines adjacent on one side of the one electrode line are arranged,
In each of the other electrode lines, an area where the second surrounding area surrounded by the first vertex and two second vertices arranged on both sides of the first vertex overlaps the first surrounding area, A planar body that is set to be larger than 0% and not larger than 20% with respect to the distance between the first vertex and the second vertex in the one electrode line with respect to the distance in the direction perpendicular to the extending direction.   The planar body according to claim 1, wherein each of the electrode lines has a polygonal line shape having the same period and the same amplitude.   The region where the second surrounding region and the first surrounding region overlap is a distance not more than twice the line width in the direction perpendicular to the direction in which each electrode extends at the second vertex of the one electrode line. The planar body according to claim 1 or 2, wherein A first imaginary line extending along a direction perpendicular to a direction in which each electrode extends and passing through an arbitrary first vertex of the one electrode line;
The second virtual lines extending along a direction perpendicular to the extending direction of the electrodes and passing through the first vertex of the other electrode lines arranged in the first surrounding region are separated from each other. The planar body according to claim 1, which is configured.   The distance between the first imaginary line and the second imaginary line is a distance in a direction in which each electrode extends between two second vertices arranged on both sides of the arbitrary first vertex in the one electrode line. The planar body according to claim 4, which is in a range of 15% to 35%.   Each separation distance between each first imaginary line passing through each first vertex in the one electrode line and each second imaginary line passing through each first vertex in the other electrode line is calculated as follows. The planar body according to claim 4 or 5, wherein the planar body is configured to be constant in a combination of each first vertex in the electrode line and each first vertex in the other electrode line. A touch panel comprising at least one planar body according to any one of claims 1 to 6.

Images