JP6401127B2 - Light transmissive conductive material - Google Patents

Description

  The present invention relates to a light transmissive conductive material mainly used for a touch panel, and more particularly to a light transmissive conductive material suitably used for a light transmissive electrode of a projected capacitive touch panel.

  In electronic devices such as personal digital assistants (PDAs), notebook PCs, OA devices, medical devices, and car navigation systems, touch panels are widely used as input means for these displays.

  The touch panel includes an optical method, an ultrasonic method, a surface capacitance method, a projection capacitance method, a resistance film method, and the like depending on a position detection method. In a resistive touch panel, a light-transmitting conductive material and a glass with a light-transmitting conductive layer are arranged to face each other with a spacer as a light-transmitting electrode serving as a touch sensor. It has a structure that measures the voltage in the glass with a flowing light transmissive conductive layer. On the other hand, a capacitive touch panel is characterized by having a light-transmitting conductive material having a light-transmitting conductive layer on a support as a light-transmitting electrode serving as a touch sensor and having no movable parts. Therefore, since it has high durability and high light transmittance, it is applied in various applications. Furthermore, since the projected capacitive touch panel can simultaneously detect multiple points, it is widely used for smartphones, tablet PCs, and the like.

  Conventionally, as a light transmissive conductive material used for a light transmissive electrode of a touch panel, a material in which a light transmissive conductive layer made of an ITO (indium tin oxide) conductive film is formed on a support has been used. However, since the ITO conductive film has a large refractive index and a large surface reflection of light, there is a problem that the light transmittance of the light transmissive conductive material is lowered. In addition, since the ITO conductive film has low flexibility, there is a problem that when the light-transmitting conductive material is bent, the ITO conductive film is cracked and the electric resistance value of the light-transmitting conductive material is increased.

  As a light-transmitting conductive material replacing a light-transmitting conductive material having a light-transmitting conductive layer made of an ITO conductive film, a metal fine wire pattern as a light-transmitting conductive layer on a support, for example, a line width of the metal thin wire pattern There is known a light-transmitting conductive material in which a mesh-like fine metal wire pattern is formed by adjusting the pitch, pitch, and pattern shape. By this technique, a light-transmitting conductive material that maintains high light transmittance and has high conductivity can be obtained. With respect to the mesh shape of the mesh-like metal fine line pattern (hereinafter also simply referred to as a metal fine line pattern), it is known that repeating units of various shapes can be used. For example, in JP 2013-30378 A, an equilateral triangle, Triangles such as isosceles triangles, right triangles, squares, rectangles, rhombuses, parallelograms, trapezoidal squares, (positive) hexagons, (positive) octagons, (positive) dodecagons, (positive) decagons (Positive) n-polygons, circles, ellipses, star-like repeating units, and combinations of two or more of these are disclosed.

  As a method for producing a light-transmitting conductive material having the above-described network-like fine metal wire pattern, a thin catalyst layer is formed on a support, a resist pattern is formed thereon, and then a metal is applied to the resist opening by plating. A semi-additive method for forming a fine metal wire pattern by laminating layers and finally removing the resist layer and the base metal protected by the resist layer is disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-287994 and Japanese Patent Application Laid-Open No. 2007-287953. It is disclosed in gazettes.

  In recent years, a method using a silver salt photographic light-sensitive material using a silver salt diffusion transfer method as a conductive material precursor is known. For example, in JP-A-2003-77350, JP-A-2005-250169, JP-A-2007-188655, etc., a silver salt photographic photosensitive material having a physical development nucleus layer and a silver halide emulsion layer at least in this order on a support. A technique for forming a metal (silver) pattern by causing a soluble silver salt forming agent and a reducing agent to act on a material (conductive material precursor) in an alkaline solution is disclosed. Patterning by this method can reproduce a uniform line width, and since silver has the highest conductivity among metals, higher conductivity can be obtained with a narrower line width than other methods. Further, the layer having the fine metal wire pattern obtained by this method has an advantage that it is more flexible than the ITO conductive layer and strong against bending.

  Since the light transmissive conductive material having these metal fine line patterns on the light transmissive support is disposed on the display, the period of the metal fine line pattern interferes with the period of the elements of the display, and moire is generated. There was a problem that occurred. In recent years, displays with various resolutions have been used, which further complicates the above problem.

  For example, JP 2011-216377 A (Patent Document 1), JP 2013-37683 A (Patent Document 2), JP 2014-48791 A (Patent Document 3), JP 2014-17519. In public relations (Patent Document 4) and the like, as a thin metal wire pattern, for example, a long-known random figure described in “Introduction to Mathematical Engineering from Voronoi Diagrams” (Non-Patent Document 1), etc. There has been proposed a method for suppressing interference between the period of the fine metal line pattern and the display element by using the above. Further, in Japanese Patent Application Laid-Open No. 2014-26510 (Patent Document 5) and Japanese Patent Application Laid-Open No. 2013-84639 (Patent Document 6), an electrode support for a touch panel formed by arranging a plurality of unit pattern regions using random metal fine line patterns is used. In Japanese Patent Application Laid-Open No. 2015-108896 (Patent Document 7), a metal fine line pattern (boundary line) of a predetermined ratio or more is less than a predetermined angle with respect to the direction in which a plurality of color pixel cells are arranged in the same pixel. A method of installing the projector at an inclination is proposed.

JP 2011-216377 A JP 2013-37683 A JP 2014-48791 A JP 2014-17519 A JP 2014-26510 A JP2013-84639A Japanese Patent Application Laid-Open No. 2015-108896

Mathematical model of Nawabari Introduction to mathematical engineering from Voronoi diagram (Kyoritsu Shuppan February 2009)

  A color display generally has three or more color pixels, which are lined up under certain rules. In a liquid crystal display, an organic EL display, and the like, there is a direction in which color pixels of the same color are continuously arranged (hereinafter referred to as a reference direction). If a metal fine line pattern exists along such a reference direction, Since the metal fine line pattern shields only the color, color unevenness may occur.

  For these reasons, in Patent Documents 1 to 6 described above, an improvement in color unevenness has been demanded.

  On the other hand, in Patent Document 7, a direction in which a plurality of color pixel cells in the same pixel are arranged (a direction in which a plurality of pixels of a blue pixel, a green pixel, and a red pixel are arranged in order in a liquid crystal display, hereinafter also referred to as a direction perpendicular to the reference direction). A light-transmitting conductive material (a touch panel electrode support) having a fine metal wire pattern (boundary line) arranged at a predetermined angle or less (45 ° or less) with respect to the above is proposed. In this case, the above-described color unevenness problem is solved.

  However, in the method proposed in Patent Document 7, many fine metal line patterns are arranged in a direction perpendicular to the reference direction. If an attempt is made to make a column electrode extending in the reference direction using such a metal pattern, the resistance value is likely to increase, or a conduction failure due to disconnection tends to occur, which may cause a problem in reliability.

  An object of the present invention is to provide a light-transmitting conductive material that does not cause moire even when superimposed on a display, has no color unevenness, and has high reliability.

The above-described problems are solved by the following means.
A light-transmitting conductive material used to overlap a display having color pixels, the light-transmitting conductive material having at least a mesh-like metal fine line pattern on a light-transmitting support, and the mesh-like metal fine wire The pattern is formed by using a Voronoi figure and / or a figure obtained by enlarging or reducing the Voronoi figure, and the mesh shape of the fine metal line pattern is 0.2 mm or longer in the sides constituting the fine metal line pattern. 90% or more of the sides having an angle of less than 15 ° with respect to the direction in which color pixels of the same color are continuously arranged are replaced with a plurality of sides having an angle of 15 ° or more with respect to the above-described direction. A light-transmitting conductive material having the shape obtained in (1).

  According to the present invention, it is possible to provide a light-transmitting conductive material which does not cause moire even when stacked on a display, has no color unevenness, and has high production reliability.

Schematic showing the arrangement of color pixels for commonly used displays The figure for demonstrating the Voronoi edge in this invention The figure for demonstrating reduction and expansion of the Voronoi figure in this invention The figure for demonstrating the method of replacing the edge | side which has an angle of less than 15 degrees with respect to a reference direction to the several edge | side which has an angle of 15 degrees or more. The figure for demonstrating the preferable method of replacing the edge | side which has an angle of less than 15 degrees with respect to a reference | standard direction by the several edge | side which has an angle of 15 degrees or more. The figure for demonstrating another preferable method of replacing the edge | side which has an angle of less than 15 degrees with respect to a reference direction by the several edge | side which has an angle of 15 degrees or more. Schematic showing an example of the light transmissive conductive material of the present invention

  Hereinafter, the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following contents without departing from the technical scope thereof.

  FIG. 1 is a schematic diagram showing an arrangement of color pixels of a commonly used display. 1-a is an arrangement of color pixels in the RGB strip method, and this method is almost adopted especially for liquid crystal displays. 1-b is an array of color pixels in the pen tile RGB system, and 1-c is an array of color pixels in the S strip system, both of which are known to be used for some organic EL displays and the like. The direction (reference direction) in which the color pixels of the same color are continuously arranged in the present invention is the y direction in the drawing, all of 1-a, 1-b, and 1-c. For convenience of explanation, the y direction is the reference direction in all the drawings used in FIG.

  A Voronoi figure used for forming a mesh-like fine metal line pattern in the present invention will be described. A Voronoi figure is a figure created by collecting Voronoi sides. The Voronoi side is a well-known figure applied in various fields such as information processing, and FIG. 2 is used to explain this. FIG. 2 is a diagram for explaining a Voronoi side in the present invention. In (2-a) of FIG. 2, when a plurality of generating points 211 are arranged on the plane 20, a region 21 closest to one arbitrary generating point 211 and a region 21 closest to another generating point Is divided by the boundary line 22 to divide the plane 20, the boundary line 22 of each region 21 is called a Voronoi side. Further, the Voronoi side becomes a part of a perpendicular bisector connecting an arbitrary generating point and an adjacent generating point.

  A method of arranging the generating points will be described with reference to (2-b) in FIG. As a method for arranging the generating points, there are a method of arranging an arbitrary number of generating points 211 on the plane 20 at random, and a method of dividing the plane 20 at random and an arbitrary number of mother points in the dividing. Although the method of arrange | positioning the point 211 etc. is mentioned, The latter method is preferable in this invention. In the present invention, as a method of dividing the plane 20, the plane 20 is filled with a single shape or a plurality of polygons having two or more types of shapes (hereinafter referred to as original polygons), and the plane 20 is formed with the original polygons. A method of partitioning or a method of enlarging or reducing the original polygon to create an enlarged / reduced polygon and partitioning the plane 20 by the enlarged / reduced polygon can be mentioned. Any method is preferably used in the present invention. After dividing the plane 20 in this way, it is preferable to arrange an arbitrary number of generating points randomly in the original polygon or the enlarged / reduced polygon. In FIG. 2 (2-b), the plane 20 is filled with a rectangular original polygon 23, and then a reduced polygon 25 is created by reducing the original polygon at a rate of 90%. Generating points 211 are randomly arranged in the reduced polygon 25. In the present invention, in order to prevent a grainy phenomenon (a phenomenon in which a pattern having a high density and a low density appears in a random figure), a single shape as shown in (2-b) is used. Preferably, the original polygon 23 is plane-filled.

  The shape of the original polygon is preferably a square such as a square, a rectangle, or a rhombus, a triangle, or a hexagon. Among these, a quadrangle is preferable from the viewpoint of preventing the grain phenomenon. The length of one side of the original polygon is preferably 100 to 2000 μm, more preferably 150 to 800 μm. As a method for creating an enlarged / reduced polygon of the original polygon, in the present invention, the ratio when enlarging / reducing in the x direction and y direction in the figure may be the same or different, but the plane filling It is preferable to enlarge or reduce all the original polygons 23 in the same direction at the same rate. Furthermore, it is preferable that the position of the enlargement / reduction polygon is the same as the position of the original polygon. In the present invention, the position of the enlargement / reduction polygon is the same as the position of the original polygon means that the position of the center of gravity of the original polygon and the position of the center of gravity of the enlargement / reduction polygon are the same. In FIG. 2 (2-b), a reduced polygon 25 is created in which the center of gravity 24 of the original polygon 23 is the origin and the original polygon is reduced to 90%. In the present invention, the ratio of the enlargement / reduction polygon to the original polygon is preferably in the range of 10 to 300%, more preferably 60 to 200%. In the present invention, it is preferable that 1 to 3 generating points 211 are arranged in an enlarged / reduced polygon, and more preferably one. In the present invention, the Voronoi side is most preferably a straight line, but a curved line, a wavy line, a zigzag line, or the like can also be used.

  In the present invention, a graphic obtained by enlarging or reducing the Voronoi graphic obtained by the above-described method in an arbitrary direction can be preferably used for forming a mesh-like fine metal wire pattern. A method for enlarging or reducing the Voronoi figure in an arbitrary direction will be described below. FIG. 3 is a diagram for explaining reduction and enlargement of Voronoi figures in the present invention. In FIG. 3, reference numeral 3a shows a Voronoi figure before scaling. FIG. 3B shows a deformation pattern when the pattern having the Voronoi side 26 in 3a is enlarged four times in the x direction and the Y direction is not changed. The Voronoi side 26 in 3a corresponds to the enlargement / reduction side 31 in 3b, and the generating point 211 in 3a corresponds to the generating point 311 in 3b.

  Next, using FIG. 4 to FIG. 6, the side having an angle of less than 15 ° with respect to the direction in which color pixels of the same color are continuously arranged (reference direction) has an angle of 15 ° or more with respect to the above-described direction. A method of replacing with a plurality of sides will be described. In FIG. 4, the sides constituting the Voronoi figure 41 have an angle of less than 15 ° with respect to the y direction serving as the reference direction, and the side 42 having a length of 0.2 mm or more is a bold line and less than 15 ° with respect to the y direction. The side 43 having a length of less than 0.2 mm is shown with a bold circle. In the present invention, it is not necessary to replace all sides having an angle of less than 15 ° with respect to the y direction as the reference direction with a plurality of sides having an angle of 15 ° or more, and particularly, a side having a length of less than 0.2 mm is not replaced. Good. For sides with an angle of less than 15 ° with respect to the reference direction and a length of 0.2 mm or more, 90% or more of the total number is replaced, and all sides with a length of 0.5 mm or more are all replaced. Replacement is preferred.

  In the present invention, in order to replace a side having an angle of less than 15 ° with respect to the reference direction, two end points (44 in FIG. 4) of the side are fixed, pass through these end points, and at least 15 ° with respect to the y direction in the figure. It is preferable to replace with a plurality of sides having an angle of. If the angle of the side to be replaced is too large, the sides to be replaced overlap each other and the area occupied by the line increases. Therefore, a plurality of sides preferably having an angle of 15 ° or more and less than 40 ° with respect to the reference direction, more preferably the reference It is preferable to replace with a plurality of sides having an angle of 20 ° to 30 ° with respect to the direction. The number of sides to be replaced is preferably 4 or less, and more preferably 2 to 3 sides. The angles of the sides to be replaced may be the same or different.

  FIG. 5 is a diagram for explaining a preferred method for replacing a side having an angle of less than 15 ° with respect to the reference direction in the present invention by a plurality of sides having an angle of 15 ° or more. 5A, the side 42 having an angle of less than 15 ° with respect to the reference direction (y direction in the drawing) passes through the end point 44 and is 15 ° or more with respect to the y direction (20 ° in FIG. 5). ) To produce a parallelogram composed of sides having an angle of. Next, the two shorter sides of the parallelogram are connected to the end point 52 opposite to the end point 44 of the side, and the three diagonal lines connecting the end points 53, and the side 54 composed of these three sides is connected. Replace side 42. Other parts were also replaced with the same method. (5-b in FIG. 5. For the sake of explanation, the replaced side 54 is shown by a bold line.)

  FIG. 6 is a view for explaining another preferred method for replacing a side having an angle of less than 15 ° with respect to the reference direction in the present invention by a plurality of sides having an angle of 15 ° or more. 6A, the side 42 having an angle of less than 15 ° with respect to the reference direction (y direction in the drawing) passes through its end point 44 and is 15 ° or more with respect to the y direction (20 ° in FIG. 6). The auxiliary lines 61 and 62 having an angle of) are produced. Next, the auxiliary lines 61 and 62 are connected, and the side 42 is replaced with a side 64 composed of these two sides. Other parts were also replaced with the same method. (6-b in FIG. 6. For the sake of explanation, the replaced side 64 is shown by a bold line.)

  In the present invention, the metal forming the mesh-like fine metal wire pattern is preferably composed of gold, silver, copper, nickel, aluminum, and a composite material thereof. As a method for forming these fine metal wire patterns, a method using a silver salt photosensitive material, a method of applying electroless plating or electrolytic plating to a silver image obtained by using the same method, a silver paste using a screen printing method, copper A method for printing conductive ink such as paste, a method for printing conductive ink such as silver ink and copper ink by the ink jet method, or a conductive layer is formed by vapor deposition or sputtering, and a resist film is formed thereon. , Exposure, development, etching, a method obtained by removing a resist layer, a metal foil such as a copper foil is pasted, a resist film is further formed thereon, exposure, development, etching, a method obtained by removing the resist layer, etc. A known method can be used. In particular, it is preferable to use a silver salt diffusion transfer method (one type of method using a silver salt photosensitive material) that can reduce the thickness of the metal fine wire pattern to be produced and can easily form an extremely fine metal fine wire pattern. The silver salt diffusion transfer method is described in, for example, Japanese Patent Application Laid-Open Nos. 2003-77350 and 2008-251274.

  If the thickness of the fine metal wire pattern produced by the above-described method is too thick, a post-process (for example, bonding with another member) may be difficult, and if it is too thin, it is difficult to ensure conductivity. Therefore, the thickness is preferably 0.01 to 5 μm, more preferably 0.05 to 1 μm. Moreover, it is preferable that it is 1-20 micrometers from a viewpoint of making electroconductivity and light transmittance compatible, and, more preferably, the line | wire width of a metal fine wire pattern is 2-7 micrometers.

  The light transmissive conductive material of the present invention is preferably used for touch panel applications. FIG. 7 is a schematic view showing an example of such a light-transmitting conductive material of the present invention. In FIG. 7, the light-transmitting conductive material 1 is formed on at least one of the light-transmitting supports 2 with a sensor portion 11 and a dummy portion 12, a peripheral wiring portion 14, a terminal portion 15, each made of a mesh-like metal fine wire pattern. It has the non-image part 13 without a pattern.

  In the light transmissive conductive material of the present invention, it is preferable to have a disconnection portion having an arbitrary width in order to prevent a short circuit between the sensors in the boundary between the sensor portion and the dummy portion or in the dummy portion. The disconnection part is a metal thin line pattern such as the position according to the sensor shape, for example, the boundary between the sensor part and the dummy part, the intersection of the side connecting the specific position from the boundary and the metal thin line, or the middle point or intersection of the metal thin line It can be provided at a specific position such as the intersection of Delaunay wire and metal fine wire connecting the generating points for forming the metal fine line pattern forming the mesh, or it can be provided with a disconnection part at random it can. It is preferable that the width | variety of a disconnection part is 1-50 micrometers, More preferably, it is 3-15 micrometers. Moreover, it is preferable to provide a disconnection part perpendicular | vertical with respect to the direction where a metal fine wire pattern extends.

In the light transmissive conductive material of the present invention, the total light transmittance of the dummy part 11 and the sensor part 12 is preferably 80% or more, more preferably 85% or more. The difference between the total light transmittances of the sensor unit 11 and the dummy unit 12 is preferably within 0.5%, more preferably within 0.1%, and even more preferably the same. . The haze value of the sensor unit 11 and the dummy unit 12 is preferably 2 or less. Further, the b ^* value representing the hue of the sensor unit 11 and the dummy unit 12 is preferably 2 or less, and more preferably 1 or less.

  The sensor unit 11 is electrically connected to the terminal unit 15 via the peripheral wiring unit 14, and the capacitance change sensed by the sensor unit 11 is electrically connected to the outside through the terminal unit 15. Can be caught. On the other hand, all the fine metal wire patterns not electrically connected to the terminal portion 15 become the dummy portion 12 in the present invention. In the present invention, the peripheral wiring portion 14 and the terminal portion 15 do not need to have a light transmission property, and may be a solid pattern (a pattern having no light transmission property), or light such as the sensor portion 11 and the dummy portion 12. It may be a mesh-like fine metal wire pattern having transparency.

  In FIG. 7, the sensor portion 11 included in the light transmissive conductive material 1 is a column electrode extending in the y direction in the drawing within the surface of the light transmissive conductive layer. Further, by providing a disconnection portion between the sensor portion 11 and the sensor portion 11 in the vicinity of the intersection of at least the contour portion a of the metal thin wire, a dummy composed of a mesh-shaped metal thin wire pattern that is not electrically connected to the sensor portion 11. Part 12. Within the light-transmitting conductive layer surface, the sensor portions 11 and the dummy portions 12 are alternately arranged, and a plurality of rows are arranged in the x direction in the figure. As shown in FIG. 7, the sensor units 11 are arranged in a plurality of rows with a constant period M in the x direction. The period M of the sensor unit 11 can be set to an arbitrary length as long as the resolution as a touch sensor is maintained. The sensor portion 11 may have a certain width, but may have a pattern period in the y direction as shown in FIG. FIG. 1 shows an example (diamond pattern example) in which the sensor unit 11 is provided with a diaphragm portion at a period L. In addition, the width of the sensor unit 11 (the width of the portion that is not narrowed down in the diamond pattern) can be arbitrarily set within a range that maintains the resolution as a touch sensor, and the shape and width of the dummy unit 12 can be arbitrarily set accordingly. Can be set to

  Examples of the light transmissive support of the light transmissive conductive material of the present invention include glass, polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), acrylic resins, epoxy resins, fluororesins, and silicone resins. , Polycarbonate resin, diacetate resin, triacetate resin, polyarylate resin, polyvinyl chloride, polysulfone resin, polyether sulfone resin, polyimide resin, polyamide resin, polyolefin resin, cyclic polyolefin resin, etc. It is preferable to use a body. Here, the light transmittance means that the total light transmittance is 60% or more, and the total light transmittance is more preferably 80% or more. The thickness of the light transmissive support is preferably 50 μm to 5 mm. Moreover, well-known layers, such as a fingerprint antifouling layer, a hard-coat layer, an antireflection layer, an anti-glare layer, can also be provided to a light-transmitting support.

  The light-transmitting conductive material of the present invention can have a known layer such as a hard coat layer, an antireflection layer, an adhesive layer, or an antiglare layer at any position. Further, a known layer such as a physical development nucleus layer, an easy adhesion layer, or an adhesive layer can be provided between the light transmissive support and the light transmissive conductive layer having the sensor portion 11, the dummy portion 12, and the like.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail using an Example, this invention is not limited to a following example, unless the summary is exceeded.

<Light transmissive conductive material 1>
A polyethylene terephthalate film having a thickness of 100 μm was used as the light transmissive support. The total light transmittance of this light transmissive support was 91%.

  Next, according to the following prescription, a physical development nucleus layer coating solution was prepared, applied onto the light transmissive support, and dried to provide a physical development nucleus layer.

<Preparation of palladium sulfide sol>
Liquid A Palladium chloride 5g
Hydrochloric acid 40ml
1000ml distilled water
B liquid sodium sulfide 8.6g
1000ml distilled water
Liquid A and liquid B were mixed with stirring, and 30 minutes later, the solution was passed through a column filled with an ion exchange resin to obtain palladium sulfide sol.

<Preparation of coating solution for physical development nucleus layer> Amount of silver salt photosensitive material per 1 m ^{2 The} palladium sulfide sol 0.4 mg
0.2% aqueous 2 mass% glyoxal solution
Surfactant (S-1) 4mg
Denacol EX-830 50mg
(Polyethylene glycol diglycidyl ether manufactured by Nagase ChemteX Corporation)
10 mass% SP-200 aqueous solution 0.5 mg
(Nippon Shokubai Polyethyleneimine; average molecular weight 10,000)

  Subsequently, an intermediate layer, a silver halide emulsion layer, and a protective layer having the following composition are coated on the physical development nucleus solution layer in order from the side closest to the light transmissive support and dried to obtain a silver salt photosensitive material. It was. The silver halide emulsion was prepared by a general double jet mixing method for photographic silver halide emulsions. This silver halide emulsion was prepared with 95 mol% of silver chloride and 5 mol% of silver bromide, and an average grain size of 0.15 μm. The silver halide emulsion thus obtained was subjected to gold sulfur sensitization using sodium thiosulfate and chloroauric acid according to a conventional method. The silver halide emulsion thus obtained contains 0.5 g of gelatin per gram of silver.

<Interlayer composition> Amount of silver salt photosensitive material per 1 m ² Gelatin 0.5 g
Surfactant (S-1) 5mg
Dye 1 50mg

<Composition of silver halide emulsion layer 1> Amount of silver salt photosensitive material per 1 m ² Gelatin 0.5 g
Silver halide emulsion 3.0g Silver equivalent 1-Phenyl-5-mercaptotetrazole 3mg
Surfactant (S-1) 20mg

<Composition of protective layer 1> Amount of silver salt photosensitive material per 1 m ² Gelatin 1 g
Amorphous silica matting agent (average particle size 3.5μm) 10mg
Surfactant (S-1) 10mg

  A transparent original having an image of the pattern shown in FIG. 7 was brought into close contact with the silver salt light-sensitive material thus obtained, and exposed through a resin filter that cut light of 400 nm or less with a contact printer using a mercury lamp as a light source. The period M of the sensor unit 11 and the period L of the diaphragm portion of the diamond pattern of the sensor unit 11 in the transparent original are both 5 mm.

  In the transparent original having the pattern image of FIG. 1, the thin line patterns of the sensor unit 11 and the dummy unit 12 are configured by a graphic using a Voronoi graphic derived from the mother point. The original polygon for making this Voronoi figure is a square whose one side in the x direction is 500 μm long and one side in the y direction is 500 μm in length. The original polygon is arranged in the x and y directions and filled in a plane. In the enlargement / reduction polygon (which is equal to the original polygon here) that connects 100% of the distance from the center of gravity of the original polygon to each vertex, one mother point is randomly selected. The Voronoi figure was produced by arranging and dividing the region closest to one generating point and the region closest to the other generating point with a boundary line. The thin line width of the Voronoi figure is 4 μm. In FIG. 7, the disconnection portion is provided with a width of 5 μm at the intersection of the boundary line a and the Voronoi side, and further, a disconnection portion of 5 μm is provided at the midpoint positions of all the Voronoi sides in the dummy portion.

  Thereafter, the film was immersed in the following diffusion transfer developer at 20 ° C. for 60 seconds, and then the silver halide emulsion layer, intermediate layer and protective layer were washed away with warm water at 40 ° C. and dried. This process was repeated 100 times to obtain 100 light-transmitting conductive materials 1 having a metal silver image having the shape of FIG. 7 as the light-transmitting conductive layer. The metallic silver image of the light transmissive conductive layer of the obtained light transmissive conductive material had the same shape and the same line width as the image of the transparent original having the patterns of FIGS. The film thickness of the metallic silver image was 0.2 μm as examined with a confocal microscope. When the total light transmittance of the sensor part and the dummy part was measured together, it was 89.6%.

<Diffusion transfer developer composition>
Potassium hydroxide 25g
Hydroquinone 18g
1-phenyl-3-pyrazolidone 2g
Potassium sulfite 80g
N-methylethanolamine 15g
Potassium bromide 1.2g
Total volume 1000ml with water
Adjust to pH = 12.2.

<Light transmissive conductive material 2>
1 is a transparent original having the pattern of FIG. 1, and all of the sides having an angle of less than 10 ° with respect to the reference direction (y direction) among the Voronoi sides produced in Example 1 are the sides shown in FIG. 5. Prepare a transparent original similar to the transparent original used in the production of the light-transmissive conductive material 1 except that the figure is replaced by a figure using a parallelogram having an angle of 20 ° with respect to the y direction. Then, 100 light-transmissive conductive materials 2 were obtained in the same manner as the light-transmissive conductive material 1 except that the transparent original was used. Of the sides constituting the mesh-like fine metal wire pattern obtained in this way, 67.2% of the sides having an angle of less than 15 ° with respect to the reference direction (an angle of less than 15 ° with respect to the reference direction). And 63.9% of sides having a length of 0.2 mm or more) were replaced with a plurality of sides having an angle of 15 ° or more.

<Light transmissive conductive material 3>
1 is a transparent manuscript having the pattern of FIG. 1, and all of the sides having an angle of less than 15 ° with respect to the reference direction (y direction) among the Voronoi sides produced in Example 1 are the sides shown in FIG. A transparent original similar to the transparent original used in the production of the light transmissive conductive material 1 is prepared except that the figure is replaced by a figure using a parallelogram having an angle of 20 ° with respect to the y direction. 100 light-transmissive conductive materials 3 were obtained in the same manner as the light-transmissive conductive material 1 except that a transparent original was used.

<Light transmissive conductive material 4>
1 is a transparent manuscript having the pattern of FIG. 1, and among the Voronoi sides produced in Example 1, a side having an angle of less than 15 ° with respect to the reference direction (y direction) is a side having a length of 0.2 mm or more. 5 is a method of replacing the side shown in FIG. 5, except for using a figure in which a parallelogram having an angle of 20 ° with respect to the y direction is used. A transparent original similar to the transparent original used was prepared, and 100 light-transmitting conductive materials 4 were obtained in the same manner as the light-transmitting conductive material 1 except that the transparent original was used.

<Light transmissive conductive material 5>
1 is a transparent manuscript having the pattern of FIG. 1, but the Voronoi figure produced in Example 1 is reduced 1.2 times in the reference direction (y direction) and 0.8 times in the x direction. The side replacement method shown in FIG. 5 for all sides having an angle of less than 15 ° with respect to the y direction and having a length of 0.2 mm or more, and has an angle of 20 ° with respect to the y direction. A transparent original similar to the transparent original used in the production of the light-transmitting conductive material 1 is prepared except that the figure replaced with the parallelogram is used. The light-transmitting conductive material 1 and the transparent original are used except that the transparent original is used. Similarly, 100 light-transmitting conductive materials 5 were obtained.

<Light transmissive conductive material 6>
1 is a transparent manuscript having the pattern of FIG. 1, and among the Voronoi sides produced in Example 1, a side having an angle of less than 15 ° with respect to the reference direction (y direction) is a side having a length of 0.2 mm or more. 6 is used in the manufacture of the light-transmitting conductive material 1 except for using the figure shown in FIG. 6 in which the side is replaced by a figure using an auxiliary line having an angle of 20 ° with respect to the y direction. A transparent original similar to the transparent original was prepared, and 100 light-transmitting conductive materials 6 were obtained in the same manner as the light-transmitting conductive material 1 except that the transparent original was used.

<Light transmissive conductive material 7>
1 is a transparent manuscript having the pattern of FIG. 1, and among the Voronoi sides produced in Example 1, a side having an angle of less than 15 ° with respect to the reference direction (y direction) is a side having a length of 0.2 mm or more. 5 is used in the manufacture of the light-transmitting conductive material 1 except for using the side replacement method shown in FIG. 5 and using a figure in which a parallelogram having an angle of 46 ° with respect to the y direction is used. A transparent original similar to the transparent original was prepared, and 100 light-transmitting conductive materials 7 were obtained in the same manner as the light-transmitting conductive material 1 except that the transparent original was used.

<Light transmissive conductive material 8>
1 is a transparent manuscript having the pattern of FIG. 1, and among the Voronoi sides produced in Example 1, a side having an angle of less than 15 ° with respect to the reference direction (y direction) is a side having a length of 0.2 mm or more. The light-transmitting conductive material 1 is selected except that the figure is replaced with a parallelogram having an angle of 20 ° with respect to the y direction in the side replacement method shown in FIG. A transparent original similar to the transparent original used in the preparation of the above was prepared, and 100 light-transmitting conductive materials 8 were obtained in the same manner as the light-transmitting conductive material 1 except that the transparent original was used.

<Light transmissive conductive material 9>
1 is a transparent manuscript having the pattern of FIG. 1, and among the Voronoi sides produced in Example 1, a side having an angle of less than 15 ° with respect to the reference direction (y direction) is a side having a length of 0.2 mm or more. The light-transmitting conductive material 1 is selected except that 95% is randomly selected and the side replacement method shown in FIG. 5 is replaced with a figure using a parallelogram having an angle of 20 ° with respect to the y direction. A transparent original similar to the transparent original used in the preparation of the above was prepared, and 100 light-transmitting conductive materials 9 were obtained in the same manner as the light-transmitting conductive material 1 except that the transparent original was used.

  The obtained light-transmitting conductive materials 1 to 9 were evaluated for reliability and color unevenness.

<Reliability>
In the pattern of FIG. 7, there are 14 sets of circuits connected in this order from the terminal portion 15 to the peripheral wiring portion 14, the sensor portion 11. In each of the 100 light transmissive conductive materials 1 to 9 obtained as described above, a multi-tester is used for all 14 sets of circuits electrically connected by design, and one pin tip Was pressed against the terminal portion 15 and the other pin tip was pressed against the uppermost portion of the sensor portion 11 in the figure to confirm conduction. Further, it was confirmed whether a short circuit occurred between all the 14 sets of circuits. Then, for 100 light-transmitting conductive materials, continuity was confirmed in all 14 sets of circuits, and the ratio of the light-transmitting conductive materials in which no short circuit occurred between all the circuits was obtained. It was shown in 1.

<Color unevenness>
The obtained light-transmitting conductive materials 1 to 9 are placed on a Flatron 23EN43V-B2 23 type wide liquid crystal monitor (manufactured by LG Electronics) on which a white image is displayed. The samples were placed so that they were lined up in a row, and those with clear color irregularities were marked with x. The results are shown in Table 1.

  From the results in Table 1, it can be seen that a light-transmitting conductive material having good recognition and high reliability can be obtained by the present invention.

DESCRIPTION OF SYMBOLS 1 Light transmissive conductive material 2 Light transmissive support body 11 Sensor part 12 Dummy part 13 Non-image part 14 Peripheral wiring part 15 Terminal part 20 Plane 21 Area 22 Boundary line 23 Original polygon 24 Center of gravity 25 Reduction polygon 26 Voronoi side 31 Enlarged / reduced sides 211, 311 Generating points 41 Voronoi figures 42, 43 Sides 44, 52, 53 End points 51 Parallelograms 54, 64 Replaced sides 61, 62 Auxiliary lines a Boundary portions L, M Period

Claims (1)

  A light-transmitting conductive material used to overlap a display having color pixels, the light-transmitting conductive material having at least a mesh-like metal fine line pattern on a light-transmitting support, and the mesh-like metal fine wire The pattern is formed by using a Voronoi figure and / or a figure obtained by enlarging or reducing the Voronoi figure, and the mesh shape of the fine metal line pattern is 0.2 mm or longer in the sides constituting the fine metal line pattern. 90% or more of the sides having an angle of less than 15 ° with respect to the direction in which color pixels of the same color are continuously arranged are replaced with a plurality of sides having an angle of 15 ° or more with respect to the above-described direction. A light-transmitting conductive material having the shape obtained in (1).