JP2007042887A - Light-transmitting electromagnetic-wave shielding window material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-transmitting electromagnetic-wave shielding window material making compatible with a light transmitting property and an electromagnetic-wave shielding property, easily ensuring a conduction with a box body and having an excellent productivity. <P>SOLUTION: The light-transmitting electromagnetic-wave shielding window material 10 contains a rectangular transparent base material, a meshy metallic conductive layer 12 formed in a rectangular shape at least at a central section on the transparent base material, and a peripheral electrode 11 formed on the transparent base material adjacent to at least one side of the meshy metallic conductive layer 12 and connected to the meshy metallic conductive layer 12. The line width of meshes in the vicinity of the peripheral electrode of the meshy metallic conductive layer 12 is made larger than those of other regions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing a light transmissive electromagnetic wave shielding window material provided with a mesh-like metal conductive layer, a light transmissive electromagnetic wave shielding window material produced by the method, and a display filter including the window material. About.

  In general, a front filter is always used for a plasma display panel (PDP). This front filter is intended for cutting near infrared rays, improving color reproducibility (emission color purity improvement), electromagnetic wave shielding, improving contrast in a bright place (antireflection), protecting a light emitting panel, blocking heat from the light emitting panel, and the like.

  It is necessary to reduce the near infrared rays emitted from the light emitting panel of the PDP in order to avoid malfunctioning the remote control used for home television and video. In addition, it is necessary to reduce the electromagnetic waves emitted by the light emitting panel of the PDP in order to avoid adverse effects on the human body and precision equipment. Furthermore, in order to make the light emitted from the light emitting panel of the PDP feel a natural color for human vision, a device for improving color reproducibility (light emission color purity improvement) is also required by correction with a filter. Further, it is desirable that the display on the display is visually recognized with sufficient contrast without being hindered by reflection of light from the outside even in a bright place such as a bright room. Furthermore, even when the display product is directly touched by hand, the heat generated by the light emitting panel of the PDP is required to be cut off in order to avoid a situation where the user is surprised by the high temperature. In order to prevent the product from being easily damaged, it is desirable that the light-emitting panel be protected so that the fragments do not scatter even if it is damaged.

  As a typical PDP front filter structure that meets the above-mentioned purpose, for example, there is a transparent substrate in which an antireflection layer, an electromagnetic wave shielding layer, a color correction filter layer, and a near infrared cut layer are laminated. Installed as a filter on the front of the light-emitting panel. The order of lamination is changed according to the purpose.

  In this PDP front filter, the light-transmitting electromagnetic wave shielding layer needs to satisfy both the light transmitting property and the electromagnetic wave shielding property. For this purpose, for example, a conductive layer having a fine mesh structure is used. The electromagnetic wave is shielded by the conductive mesh portion, and at the same time, light transmission is ensured by the opening portion.

  The window material that can be used as the light-transmitting electromagnetic wave shielding layer is manufactured by various methods.

  For example, there is a method in which a conductive mesh such as a wire mesh is formed by weaving conductive fibers and is integrated by interposing it between transparent substrates. In general, when the conductive fiber constituting the mesh has a large wire diameter, the eye becomes rough, and thus the wire diameter is reduced to obtain a fine mesh. For this reason, in order to obtain good light transmittance and visibility, it is necessary to make the conductive fibers thin, but this is very difficult.

  There is also a method of forming a transparent conductive film by forming a transparent metal film on the entire surface of a transparent substrate. In this way, those having both light transmittance and electromagnetic wave shielding properties cannot improve the electromagnetic wave shielding properties so much, and it is not easy to ensure the conduction between the electromagnetic wave shielding layer and the housing. .

  In contrast to such a method, Patent Document 1 (Japanese Patent Laid-Open No. 2001-332889) forms dots on a film surface with a substance soluble in a solvent, and insoluble in the solvent on the film surface. An electromagnetic wave shielding light having a mesh-like conductive pattern is formed by forming a conductive material layer made of a conductive material and contacting the film surface with the solvent to remove the dots and the conductive material layer on the dots. A method of manufacturing a transmissive window material is disclosed. According to this method, thinning is possible compared with the above-mentioned method, and relatively high electromagnetic shielding properties can be obtained.

JP 2001-332889 A

  When using the method (soluble dot forming method) described in Patent Document 1 (Japanese Patent Laid-Open No. 2001-332889) described above, the present inventors connected a mesh-like conductive pattern to the end of the film surface. Inspired by the fact that the surface of the band-shaped metal conductive layer is provided as a peripheral electrode for ensuring conduction, it is easy to ensure conduction between the light-transmitting electromagnetic wave shielding layer and the housing, and research and development has been conducted on this. I went.

  A conventional light-transmitting electromagnetic wave shielding window material developed by the present inventors will be described with reference to FIG. FIG. 6 is an explanatory view showing a typical example of such a light transmissive electromagnetic wave shielding window material from above. The light-transmitting electromagnetic wave shielding window material of FIG. 6 is provided with a mesh-like metal conductive layer and a peripheral electrode adjacent thereto on a transparent film.

  The light-transmitting electromagnetic wave shielding window material 60 is composed of a mesh-shaped metal conductive layer region 62 provided in a rectangular shape when viewed from above the surface, and a peripheral electrode 61 surrounding the four sides. A partially enlarged view of a region where the mesh-shaped metal conductive layer region 62 and the peripheral electrode 61 are adjacent is shown in a circle. The mesh-shaped metal conductive layer 62a forms a mesh having the same line width over the entire mesh-shaped metal conductive layer region, and is fused and connected to the adjacent peripheral electrode 61 while maintaining the line width. As the mesh, a mesh void 62b exists, and this portion is not covered with the metal conductive layer, so that the upper surface of the transparent film, which is a layer below the metal conductive layer, is exposed. The mesh voids (mesh eyes) are present as repetitions of substantially the same square shape as the voids 62b over almost the entire mesh-like metal conductive layer region 62, but in the region adjacent to the peripheral electrode 61, A square gap exists as a deficient void 62c having a shape that is cut and cut off in the middle.

  The light-transmitting electromagnetic wave shielding window material having such a structure has a very fine mesh-shaped metal conductive layer, so that both light transmission and electromagnetic wave shielding properties are ensured at the same time. The connection portion between the metal conductive layer and the peripheral electrode has a disadvantage that disconnection or breakage is likely to occur in the manufacturing process using the printing method. The occurrence of such disconnection reduces the yield of the product or increases the resistance value of the connection between the peripheral electrode and the mesh-like metal layer even if it is a minute fracture that is difficult to distinguish from the appearance. Adversely affects the ensuring of electrical conduction, and reduces the electromagnetic shielding properties of final products such as display filters. Further, when electroplating is performed as a subsequent process, the voltage concentrates on a portion where a minute fracture has occurred, so that the conductive layer may be eluted or the base material may be damaged by the heat.

  Therefore, the object of the present invention is to prevent the above-described disconnection or breakage at the connection portion between the mesh-shaped metal conductive layer and the peripheral electrode, and to achieve excellent productivity, while satisfying both light transmittance and electromagnetic wave shielding properties. An object of the present invention is to obtain a light-transmitting electromagnetic wave shielding window material that can easily ensure conduction with a body.

  Another object of the present invention is to provide a display filter obtained by using the above-mentioned light transmissive electromagnetic wave shielding window material.

  Another object of the present invention is to find a manufacturing method suitable for the light-transmitting electromagnetic wave shielding window material, which does not require a significant change in the conventional manufacturing process.

  Another object of the present invention is to provide a light transmissive electromagnetic wave shielding window material obtained by the above production method and a display filter obtained by using the light transmissive electromagnetic wave shielding window material.

The inventors of the present invention have the above-described object in that a rectangular transparent base material, a mesh-like metal conductive layer provided in a rectangular shape at least on the transparent base material, and at least one of the mesh-like metal conductive layer A light-transmitting electromagnetic wave shielding window material comprising a peripheral electrode provided on the transparent substrate adjacent to a side and connected to the mesh-like metal conductive layer,
It has been found that this is achieved by a light-transmitting electromagnetic wave shielding window material characterized in that the line width of the mesh in the vicinity of the peripheral electrode of the mesh-like metal conductive layer is larger than the line width of other areas.

  This configuration minimizes the occurrence of breaks and breaks during work at the connection between the mesh-like metal conductive layer and the peripheral electrode, while achieving light transmission and visibility achieved by a fine mesh structure. Is not reduced. That is, the above-described disconnection or breakage does not occur at the connection portion between the mesh-shaped metal conductive layer and the peripheral electrode, and it is excellent in productivity, ensuring both light transmission and electromagnetic shielding properties, and ensuring conduction with the housing. Can be obtained.

  In addition, it is preferable that the line width of the mesh in the vicinity of the peripheral electrode of the mesh-shaped metal conductive layer is larger than the line width of other areas in the band-shaped area having a width within 3 to 50 mm from the connected peripheral electrode. Moreover, it is preferable that the line width of the mesh in the vicinity of the peripheral electrode of the mesh-shaped metal conductive layer is larger as it is closer to the peripheral electrode to be connected, and is continuously increased. Thereby, it is possible to minimize the influence on the light transmission and visibility while sufficiently preventing disconnection and breakage at the connection portion between the mesh-shaped metal conductive layer and the peripheral electrode.

  Moreover, it is preferable that the said peripheral electrode is provided adjacent to 2 sides or 4 sides which oppose among 4 sides of the mesh-shaped metal conductive layer provided in the rectangular shape. The peripheral electrode can be provided adjacent to at least one side. However, in order to obtain a sufficient effect from the viewpoint of electrical connection, the peripheral electrode is preferably provided adjacent to at least two sides, and all four sides of the rectangle are provided. More preferably, it is provided adjacent to. However, when the light-transmitting electromagnetic wave shielding window material is continuously produced in the long film, it is advantageous to provide a peripheral electrode adjacent to two sides corresponding to the side in the traveling direction of the long film. is there.

  Moreover, it is preferable that the mesh line width in the vicinity of the peripheral electrode of the mesh-shaped metal conductive layer is connected to the peripheral electrode with a line width in the range of 2 to 10 times that of the other area. .

  Furthermore, in a preferred embodiment of the present invention, a partially missing planar figure in which a mesh gap (mesh eye) is different from a mesh gap in a portion other than the connection portion in a connection portion with the peripheral electrode. It is preferable that it is formed as a metal conductive layer without forming a void having a (particularly polygonal) shape for the reasons described later.

  In other words, in a conventional mesh metal layer, a planar figure corresponding to a mesh gap (mesh eye) that is a unit of repetition at a position where the repetition of the mesh pattern reaches the boundary with the edge of the film surface or the peripheral electrode ( In particular, the polygon) was cut in the middle and the repeated pattern was finished. However, even if there is a gap at the end in this way, not only does it not greatly contribute to the improvement of the light transmission and visibility of the product, but the printing of this part is also uneven and faint, especially blurring is likely to occur. However, disconnection or breakage occurs in the vicinity of the connection portion between the mesh-shaped metal conductive layer and the peripheral electrode. Therefore, voids (mesh eyes) that remain in the form of being cut in the middle, and voids that are part of the missing flat figure (particularly polygons) are formed as part of the metal conductive layer without providing voids. Therefore, it is possible to prevent the breakage and breakage from being easily generated, and to form the metal conductive layer without forming a void, thereby realizing the configuration of the present invention that increases the mesh-like line width as a result. Thus, the occurrence of unevenness, blurring and blurring during printing is suppressed, and the occurrence of disconnection and breakage around the connection portion between the mesh-like metal conductive layer and the peripheral electrode is extremely reduced. Further, for the reasons described above, it is preferable that there is no missing plane figure (particularly polygon), but if it is reduced to a level where it can be said that it is substantially absent, an effect corresponding thereto is brought about. The number of plane figures that are missing is preferably 5 or less, particularly preferably 3 or less, per 1 cm length of the connection portion with the peripheral electrode.

  In addition, the plane figure of the mesh voids (mesh eyes) is preferably a polygon, and particularly preferably approximately rhombus or approximately square for forming a mesh pattern. In addition, when the line width of the mesh is changed according to the present invention, the shape of the plane figure naturally becomes a deformed shape as a result.

  The metal conductive layer preferably contains a conductive metal and / or metal oxide, and particularly preferably contains copper and / or silver from the viewpoint of conductivity.

  The transparent substrate is preferably a resin film from the viewpoint of flexibility and the like, and particularly preferably a PET film from the viewpoint of light transmittance and the like. Furthermore, it is preferable that the transparent substrate is a plate glass from the standpoint of self-supporting property and hardness.

  Furthermore, the present invention also resides in a display filter including the light transmissive electromagnetic wave shielding window material.

  Furthermore, this invention exists also in the following manufacturing methods suitable for manufacture of the said light-transmitting electromagnetic wave shielding window material.

That is, the present inventors have a rectangular transparent substrate, a mesh-shaped metal conductive layer provided in a rectangular shape at least on the transparent substrate, and adjacent to at least one side of the mesh-shaped metal conductive layer A light-transmitting electromagnetic wave shielding window material comprising a peripheral electrode provided on the transparent substrate and connected to the mesh-like metal conductive layer, and the following steps:
A negative image of a mesh pattern in a rectangular shape at least in the center on the transparent substrate,
Adjacent to at least one side of the rectangular area of the negative image, leaving a non-printing area for forming the peripheral electrode,
In the neighboring region adjacent to the non-printing region in the rectangular region of the negative image, the polygon corresponding to each mesh is a polygon having an area smaller than the other regions in the negative image region. like,
Forming the negative pattern printing layer by printing using a solvent-soluble ink;
Forming a metal conductive layer insoluble in the solvent on the surface of the transparent substrate on which the negative pattern printing layer is formed;
The surface of the transparent substrate on which the metal conductive layer is formed is washed with a solvent capable of dissolving the negative pattern print layer, thereby removing the negative pattern print layer and the metal conductive layer on the negative pattern print layer. And forming a mesh-like metal conductive layer,
It has been found that the object of the present invention described above can be achieved by a method (soluble dot forming method) produced by a method characterized in that

  This manufacturing method makes it easy to make the mesh line width in the vicinity of the peripheral electrode of the mesh-like metal conductive layer larger than the line width of other regions, and has a light-transmitting electromagnetic wave shielding property having a fine mesh structure. The window material can be manufactured while minimizing the occurrence of defects at the time of printing at the connection portion between the mesh-like metal conductive layer and the peripheral electrode, and the occurrence of disconnection or breakage caused by the defect.

  Moreover, it is preferable that the polygon corresponding to each mesh is not printed in the position which contacts the said non-printing area | region. As a result, at the connecting portion between the mesh-shaped metal conductive layer and the peripheral electrode, a gap left in the middle of cutting or a void having a partially missing polygonal shape is provided without providing a gap as a gap. As a result, it is possible to prevent a failure during printing and a disconnection or breakage from being easily caused near the connection portion between the mesh-like metal conductive layer and the peripheral electrode.

  Further, the step of forming a metal conductive layer insoluble in the solvent on the surface of the transparent substrate on which the negative pattern printing layer is formed is performed by a vapor deposition method of metal and / or metal compound. Is preferable from the viewpoints of control of layer thickness, layer formation speed, and the like.

Furthermore, the present inventors are adjacent to at least one side of a rectangular transparent base material, a mesh-shaped metal conductive layer provided in a rectangular shape at the center of the transparent base material, and the mesh-shaped metal conductive layer. And a peripheral electrode provided on the transparent base material and connected to the mesh-like metal conductive layer, a light-transmitting electromagnetic wave shielding window material comprising the following steps:
In order to provide a positive image of a mesh pattern in a rectangular region at least in the central part on the transparent substrate,
Adjacent to at least one side of the positive image region of the mesh-like pattern, connected to a mesh line, and provided with a band-like peripheral electrode pattern along the side,
The mesh line in the vicinity of the peripheral electrode pattern in the mesh pattern image region is a line having a larger line width than other portions in the mesh pattern image region.
Forming a conductive ink layer by printing using a conductive ink;
By drying and / or sintering the conductive ink layer, the mesh-like metal conductive layer is removed from the conductive ink layer of the mesh pattern image, and the conductive ink layer on the peripheral electrode pattern is peripheral. Forming an electrode;
It has been found that the object of the present invention described above can be achieved by a method (positive pattern printing method) produced by a method characterized by comprising

  This manufacturing method makes it easy to make the mesh line width in the vicinity of the peripheral electrode of the mesh-like metal conductive layer larger than the line width of other regions, and has a light-transmitting electromagnetic wave shielding property having a fine mesh structure. The window material can be manufactured while minimizing the occurrence of disconnection or breakage at the connecting portion between the mesh-like metal conductive layer and the peripheral electrode.

In the step of forming the conductive ink layer,
In the vicinity of the peripheral electrode pattern, the conductive ink was formed without providing a mesh gap in contact with the peripheral electrode pattern, so that the connection was made between the mesh-shaped metal conductive layer and the peripheral electrode. Voids that remain in the form (mesh eyes) and voids that are partly missing planar figures (especially polygons) can be formed as part of the metal conductive layer without providing voids. It is possible to prevent disconnection or breakage from being easily generated at the connection portion between the metal conductive layer and the peripheral electrode.

  Furthermore, this invention exists also in the light transmissive electromagnetic wave shielding window material obtained by the above-mentioned manufacturing method. Moreover, this invention exists also in the filter for a display containing this light transmissive electromagnetic wave shielding window material.

  The light-transmitting electromagnetic wave shielding window material of the present invention secures a very fine mesh-shaped metal conductive layer, and at the connecting portion between the mesh-shaped metal conductive layer and the surrounding electrode, printing unevenness, blurring, blurring. Therefore, the occurrence of disconnection or breakage is minimized. For this reason, a decrease in product yield due to the occurrence of disconnection is avoided, and productivity is excellent. Further, in the subsequent electroplating process or the like in the production process, there is no further problem caused by applying a high voltage locally in the vicinity of the location where disconnection or slight breakage occurs. In addition, since minute breaks that are difficult to identify from the outside are extremely reduced, it is possible to ensure conduction with the casing without increasing the resistance value of the connection between the peripheral electrode and the mesh metal layer. Therefore, if the light-transmitting electromagnetic wave shielding window material of the present invention is used, the electromagnetic wave shielding property of the final product such as a display filter can be maintained at a high level while being compatible with the light transmitting property.

  The light transmissive electromagnetic wave shielding window material of the present invention has both light transmissive properties and electromagnetic wave shielding properties, and is excellent in productivity, and is particularly suitable for a plasma display panel (PDP) front filter. A light-transmitting electromagnetic wave shield that is suitable for filters for other displays because it is a transparent electromagnetic wave-shielding window material and has achieved light transmission and electromagnetic wave shielding properties with good productivity. Window material.

  The display filter of the present invention obtained by using the above-described light transmissive electromagnetic wave shielding window material has both light transmittance and electromagnetic wave shielding properties and is excellent in productivity.

  Furthermore, it is a light-transmitting electromagnetic wave shielding window material that can be widely used in applications that are required to avoid the influence of electromagnetic waves, such as display windows provided in precision equipment, etc., and window materials in hospitals and laboratories, etc. Is a novel light-transmitting electromagnetic wave shielding window material that can be suitably used and has similar advantages.

  Moreover, if the manufacturing method of this invention is used, the said light-transmitting electromagnetic wave shielding window material can be easily manufactured, without having to change the conventional manufacturing process significantly.

  The light-transmitting electromagnetic wave shielding window material and the manufacturing method of the present invention will be described in detail below.

  A typical example of the light-transmitting electromagnetic wave shielding window material of the present invention will be described with reference to FIG. FIG. 1 is an explanatory view showing a typical example of the light-transmitting electromagnetic wave shielding window material of the present invention from above. The light-transmitting electromagnetic wave shielding window material of FIG. 1 is also provided with a mesh-like metal conductive layer and a peripheral electrode adjacent thereto on a transparent film, as in FIG. In FIG. 1, a light-transmitting electromagnetic wave shielding window material 10 is composed of a mesh-shaped metal conductive layer region 12 provided in a rectangular shape and a peripheral electrode 11 surrounding adjacent four sides thereof. A partial enlarged view of a region where the mesh-shaped metal conductive layer region 12 and the peripheral electrode 11 are adjacent to each other is shown in a circle. The mesh-shaped metal conductive layer 12a has a line width larger than that in other mesh-shaped metal conductive layer regions in the vicinity of the peripheral electrode, and is fused and connected to the adjacent peripheral electrode 11. The mesh gap (mesh eye) 12b is a smaller gap corresponding to the increase in the line width. In the portion connected to the peripheral electrode, there is a polygonal gap (defect gap) 12c that is missing as if the polygon of each mesh was cut in the middle by the peripheral electrode.

  The light-transmitting electromagnetic wave shielding window material of the present invention having such a structure increases the line width around the connection portion of the mesh-shaped metal conductive layer with the peripheral electrode, and also has a void gap that is likely to cause printing defects. Therefore, the occurrence of defects such as blurring and blurring during printing is minimized, and the occurrence of disconnection or breakage due to the occurrence is minimized. On the other hand, since the increase in the line width stops at the peripheral portion of the window material, it does not adversely affect the light transmission property and the electromagnetic wave shielding property. In particular, when a display filter is manufactured as a final product, the peripheral portion can be provided in a region that does not affect display display.

  It is preferable that the line width of the mesh in the vicinity of the peripheral electrode of the mesh-shaped metal conductive layer is larger than the line width of other regions in the band-like region having a width of 3 to 50 mm, particularly 5 to 20 mm from the peripheral electrode to be connected. Further, the mesh line width in the vicinity of the peripheral electrode of the mesh-like metal conductive layer is connected to the peripheral electrode with a line width in the range of 2 to 10 times, particularly 2 to 4 times that of other regions. It is preferable. The average line width of the mesh-like metal conductive layer at the center of the rectangular region is generally 5.0 to 50.0 μm, preferably 5.0 to 40.0 μm, and particularly preferably 10.0 to 30.0 μm. The value of the line width of the mesh in the vicinity of the peripheral electrode of a suitable mesh-like metal conductive layer varies depending on the value of the average line width at the center, but is larger than this, generally 10 to 500 μm, preferably 20 ˜300 μm, particularly preferably in the range of 30 to 100 μm. Moreover, it is preferable that the line width of the mesh in the vicinity of the peripheral electrode of the mesh-shaped metal conductive layer is larger as it is closer to the peripheral electrode to be connected, and is continuously increased. Thereby, it is possible to minimize the influence on the light transmission and visibility while sufficiently preventing disconnection and breakage at the connection portion between the mesh-shaped metal conductive layer and the peripheral electrode.

  In addition, the peripheral electrode is preferably provided adjacent to all four sides of the mesh-shaped metal conductive layer provided in a rectangular shape, but a certain effect can be obtained by providing the peripheral electrode on two opposite sides. it can. A temporary effect can be obtained also by providing it adjacent to at least one side. FIG. 2 illustrates an example in which the peripheral electrode is provided adjacent to two opposing sides of the mesh-shaped metal conductive layer provided in a rectangular shape as described above. In FIG. 2, a light-transmitting electromagnetic wave shielding window material 20 includes a mesh-shaped metal conductive layer region 22 provided in a rectangular shape and peripheral electrodes 21 adjacent to the two opposing sides. This peripheral electrode is provided in the longitudinal direction in a continuous film that is continuously conveyed. A partial enlarged view of a region where the mesh-shaped metal conductive layer region 22 and the peripheral electrode 21 are adjacent is shown in a circle. The mesh-shaped metal conductive layer 22a has a line width larger than that in other mesh-shaped metal conductive layer regions in the vicinity of the peripheral electrode, and is fused and connected to the adjacent peripheral electrode 21. The mesh gap 22b is a smaller gap corresponding to the increased line width. In the portion connected to the peripheral electrode, as in FIG. 1, there is a polygonal gap (deletion gap) 22c that is missing as if the polygon of each mesh was cut in the middle by the peripheral electrode.

  The light-transmitting electromagnetic wave shielding window material of the present invention can be produced either by single-sheet processing of a sheet-like film or through continuous processing of a long film. In the single wafer processing of the sheet-like film, it is preferable from the viewpoint of the effect of installing the peripheral electrode that the peripheral electrode is provided adjacent to all four sides of the mesh-shaped metal conductive layer provided in a rectangular shape. When the continuous processing of the long film is performed, the peripheral electrode is provided adjacent to two opposing sides of the mesh-like metal conductive layer provided in a rectangular shape, and the two sides are continuously conveyed. It is preferable to provide it so that it may correspond to the belt | band | zone continuous area | region on both sides with respect to the advancing direction of a long film from a viewpoint of the balance of the productivity improvement and the effect of peripheral electrode installation.

  Next, another typical example of the light transmissive electromagnetic wave shielding window material of the present invention will be described with reference to FIG. FIG. 3 is an explanatory view shown from above, similarly to FIGS. 1 and 2. The light-transmitting electromagnetic wave shielding window material shown in FIG. 3 is also provided with a mesh-like metal conductive layer and a peripheral electrode adjacent thereto on a transparent film.

  The light-transmitting electromagnetic wave shielding window material 30 includes a mesh-shaped metal conductive layer region 32 provided in a rectangular shape, and a peripheral electrode 31 surrounding and adjoining four sides thereof. A partial enlarged view of a region where the mesh-shaped metal conductive layer region 32 and the peripheral electrode 31 are adjacent to each other is shown in a circle. The mesh-shaped metal conductive layer 32 a is fused and connected to the adjacent peripheral electrode 31. The mesh gap 32b has a substantially square shape, and only the substantially square-shaped gap exists as the mesh gap (mesh eyes). In the region adjacent to the peripheral electrode 61, there is no void (defect void) in the shape of a substantially square shape that was cut in the middle, which was present in the mesh of the conventional shape, and the corresponding portion is a metal conductive It is formed as a layer.

  In the light-transmitting electromagnetic wave shielding window material of the present invention having such a structure, the connecting portion between the mesh-like metal conductive layer and the peripheral electrode is formed as a metal conductive layer with a void, thereby breaking or breaking during printing. Is minimal. On the other hand, since the disappearance of the voids stops at the peripheral portion of the window material, it does not adversely affect the light transmission property and the electromagnetic wave shielding property. The light-transmitting electromagnetic wave shielding window material shown in FIG. 3 can also be provided in a region that does not affect display display when a display filter is manufactured as a final product.

  The shape of the mesh from which the voids are removed in this way is the one in which the wire width of the mesh-like metal conductive layer is extremely increased at the connection portion with the peripheral electrode, thereby sufficiently preventing the disconnection and breakage at the connection portion. Can also be seen. However, the aspect in which the voids described with reference to FIG. 3 are removed and the aspect in which the line width is increased within the certain range described with reference to FIG. 1 can be realized simultaneously by combining them. Further preferred implementations of the invention are possible.

  Next, the manufacturing method of the present invention suitable for manufacturing the above-described light-transmitting electromagnetic wave shielding window material will be described. The manufacturing method of the present invention is a manufacturing method suitable for manufacturing a light-transmitting electromagnetic wave shielding window material that requires precise line width control. The production method of the present invention can be performed, for example, as follows. Hereinafter, an example of the production method of the present invention will be described with reference to the drawings.

  FIG. 4 is an explanatory view showing an example of the flow of the manufacturing method of the present invention by the soluble dot forming method while showing a cross section of the light transmissive electromagnetic wave shielding window material. On the transparent substrate 41, printing is performed with a solvent-soluble ink to form a negative pattern printing layer 42 which is a negative image of the mesh (step 4a indicated by the arrow in FIG. 4). When forming the negative pattern printing layer 42, as can be seen from the top view of FIG. 1, a rectangular negative pattern printing region is provided on the transparent substrate by repeated printing in a substantially square shape, and transparent A non-printing area is provided as a peripheral electrode pattern adjacent to the four sides of the negative pattern printing area on the substrate, and printing in a substantially square shape in the vicinity of the peripheral electrode pattern is performed from other parts of the negative pattern printing area. Is also provided with a small print. A metal conductive layer 43 that is insoluble in the solvent is formed on the transparent substrate on which the negative pattern printing layer 42 is thus formed (step 4b). Further, the negative pattern printing layer 42 with solvent-soluble ink is washed and removed, and at the same time, the metal conductive layer thereon is removed to obtain a metal conductive layer (mesh-like metal conductive layer) 44 of a positive image of the mesh (step 4c). ).

  With this manufacturing method, the line width of the mesh in the vicinity of the peripheral electrode of the mesh-like metal conductive layer can be easily made larger than the line width of other regions. And the characteristic about the magnitude | size, distribution, etc. of the mesh line width in this invention mentioned above can be implement | achieved easily.

  Furthermore, in this manufacturing method, as can be understood from FIG. 3, the above-described method is achieved by not printing a shape in which a substantially square shape is cut in the middle at the connection portion between the mesh-like metal conductive layer and the peripheral electrode. It is also possible to easily manufacture a mesh shape from which the voids are removed. This combination can more effectively prevent disconnection and breakage at the connection portion with the peripheral electrode.

  The material of the transparent substrate is not particularly limited as long as it is transparent (meaning “transparent to visible light”) and can withstand the processing in the process. For example, polyester, polyethylene terephthalate ( PET), polybutylene terephthalate, polymethyl methacrylate (PMMA), acrylic resin, polycarbonate (PC), polystyrene, triacetate resin, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene, ethylene-vinyl acetate copolymer, polyvinyl butyral , Metal ion crosslinked ethylene-methacrylic acid copolymer, polyurethane, cellophane and the like. Among these, polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), etc. are highly resistant to loads during processing (heat, solvent, bending, etc.) and particularly highly transparent. preferable. Moreover, as a self-supporting base material, plate glass can be used suitably.

  The thickness of the transparent substrate is preferably about 1 μm to 5 mm, although it varies depending on the use of the electromagnetic shielding light transmitting window material.

  In the negative pattern printing ink, a solvent-soluble substance is selected and used so as to form a negative pattern printing layer (printing dots) soluble in the solvent. Accordingly, the negative pattern printing ink is generally selected in relation to the solvent used for the subsequent removal. For example, when an aqueous solvent is used as the solvent, a water-soluble ink is used, and when an oil-based solvent is used as the solvent, an oil-soluble ink is used. Examples of the solvent include known organic solvents, but water is particularly preferable in consideration of the low cost, the influence on the environment, and the combination with the anti-glare ink in the present invention. As water, in addition to normal water (tap water, distilled water, ion-exchanged water, etc.), an aqueous solution containing acid, alkali, surfactant and the like may be used.

  When the solvent is water, the substance used for the water-soluble ink is preferably a water-soluble resin, and polyvinyl alcohol is particularly preferable in terms of having good water solubility. The polyvinyl alcohol is preferably contained at a concentration in the range of 10 to 30% by mass, preferably in the range of 5 to 15% by mass with respect to the entire negative pattern printing ink solution. If desired, the negative pattern printing ink may be mixed with a pigment, a dye, or the like in order to make it easy to check the finished state.

  As a method for forming a mesh negative image (dot) using negative pattern printing ink, any method other than printing can be used as long as it can form a layer similar to the negative pattern printing layer. However, printing is preferable because a conductive layer having a small line width and a high aperture ratio can be formed. Examples of the printing method include gravure printing, screen printing, ink jet printing, electrostatic printing, and the like. Among these, gravure printing is particularly preferable in that a thin line such as a conductive layer can be formed. The “aperture ratio” is a value obtained by calculation from the line width of the lattice in the lattice-shaped antiglare layer and the conductive layer and the number of lattices (lines) existing in 1 inch width.

  The shape of the negative image of each mesh is not particularly limited as long as the conditions such as the line width of the mesh and the shape and size of the gap (mesh eyes) described above can be satisfied. , Substantially regular triangles, substantially squares, substantially regular hexagons, other polygonal shapes, and dots formed by plane figures such as circles and ellipses. Of these, a substantially rectangular dot shape is preferable in that a grid-like conductive layer is suitably formed, and the aperture ratio is higher and the line width of the lattice is more uniform. preferable. When the gap (printing dot) of the mesh is substantially square, the length of one side is preferably in the range of 100 to 500 μm, particularly in the range of 150 to 400 μm, and the gap between dots is 5 to 40 μm. In the range of 10 to 30 μm. In terms of being able to form a grid-like conductive layer or the like having a smaller line width, the gap between dots is preferably narrow. Then, in the vicinity of the peripheral electrode, the mesh line width is within a certain range from the peripheral electrode to be connected, preferably 3 to 50 mm, particularly preferably 5 to 20 mm. It is preferable to set the gap between the above-described printing dots so that the size of the dot is large. Furthermore, the mesh line width in the vicinity of the peripheral electrode of the mesh-like metal conductive layer is connected to the peripheral electrode with a line width in the range of 2 to 10 times, particularly 2 to 4 times the line width of other regions. As described above, it is preferable to reduce the size (area) of the negative image (printing dot) of each mesh and increase the gap. The value of the line width of the mesh in the vicinity of the peripheral electrode of a suitable mesh-like metal conductive layer varies depending on the value of the average line width at the center, but is larger than this, generally 10 to 500 μm, preferably 20 ˜300 μm, particularly preferably in the range of 30 to 100 μm. In addition, the negative image (printing) of each mesh described above so that the line width of the mesh in the vicinity of the peripheral electrode of the mesh-like metal conductive layer increases as it approaches the peripheral electrode to be connected, and preferably increases continuously. It is preferable to reduce the size (area) of the dots and increase the gap. The thickness of the negative pattern printing layer (dot) to be formed is not particularly limited as long as it is a thickness that protects the transparent substrate from the formation of the metal thin film and can be washed and removed later, but is in the range of 0.1 to 5 μm. A thickness in the range is preferable.

  The metal conductive layer is not particularly limited as long as it is insoluble in the solvent for removing and removing the negative pattern printing layer (printing dots). For example, aluminum, nickel, indium, chromium, gold, vanadium, tin, cadmium, silver It preferably contains a metal such as platinum, copper, titanium, cobalt, lead, an alloy, or a conductive oxide such as ITO.

  The thickness of the metal conductive layer is preferably about 0.01 to 10 μm. When the thickness is less than 0.01 μm, the electromagnetic shielding performance may not be sufficient. On the other hand, when the thickness exceeds 10 μm, the thickness of the obtained electromagnetic shielding light-transmitting window material is affected and the viewing angle is narrowed. May end up.

  The method for forming the metal conductive layer is not particularly limited, but gas phase plating methods (vapor phase film formation methods) such as sputtering, ion plating, vacuum vapor deposition and chemical vapor deposition, and liquid phase plating (liquid phase film formation methods). ) (For example, electrolytic plating, electroless plating, etc.), printing, coating, and the like, and vapor phase plating (for example, sputtering, ion plating, vacuum deposition, chemical vapor deposition, etc.) is preferable. In particular, the vacuum vapor deposition method can be suitably used from the viewpoint of film thickness uniformity and metal layer creation speed. After the formation of the metal conductive layer, an electromagnetic wave shielding light transmitting window material in which the antiglare layer is formed on both sides of the conductive layer can be manufactured by further forming an antiglare layer on the metal conductive layer as desired. Good.

  In washing and removing the negative pattern printing ink (printing dots), the negative pattern printing layer and the metal conductive layer formed on the negative pattern printing layer are preferably removed using a solvent capable of dissolving the negative pattern printing layer. There is no particular limitation as long as it can be used. In the cleaning, if desired, dissolution promoting means such as an ultrasonic irradiation brush or sponge may be used in combination. In particular, by uniformly applying a high-pressure jet of water to the front surface of the substrate, the negative pattern printing layer on the entire surface of the substrate and the metal conductive layer formed thereon can be removed evenly. By the removal, the dot pattern formed of a substance soluble in the solvent was dissolved, and further, the metal conductive layer formed on the dot pattern was peeled off as the pattern was dissolved and formed in the region between the patterns. Only the metal conductive layer and the antiglare layer remain without peeling off, and if necessary, finish-cleaned (rinse) and dried to form an electromagnetic wave shielding light-transmitting window in which a mesh-like metal conductive layer is formed on a transparent substrate A material is obtained.

  The mesh-shaped metal conductive layer can be further thickened as desired. By increasing the thickness, a further excellent electromagnetic shielding property can be obtained. The treatment for increasing the thickness of the metal conductive layer is preferably performed by plating, particularly electroplating. As the metal to be electroplated, it is generally possible to use copper, copper alloy, nickel, aluminum, silver, gold, zinc or tin, preferably copper, copper alloy, silver or nickel, especially From the viewpoint of economy and conductivity, it is preferable to use copper or a copper alloy. Thickening is performed in order to form a thickness that achieves appropriate electromagnetic wave shielding properties for the entire metal conductive layer. Therefore, the appropriate thickness varies depending on the thickness of the mesh-shaped metal conductive layer. It is the range of 10-10 micrometers, and the range of 2-8 micrometers is preferable. Particularly in the case of treatment with copper, it is preferably in the range of 3 to 6 μm. If the thickness of the metal conductive layer is less than 1 μm, a high level of electromagnetic shielding properties cannot be ensured. If the plating thickness exceeds 10 μm, the plating layer tends to spread in the width direction, and the line width increases, resulting in a decrease in aperture ratio. There is a tendency.

  FIG. 5 is an explanatory view showing an example of the flow of the manufacturing method of the present invention by the positive pattern printing method while showing a cross section of the light-transmitting electromagnetic wave shielding window material. In the step (c) of FIG. 5, a conductive ink coating layer having a mesh pattern is printed from a blanket (not shown) on the transparent substrate 51 to form a positive conductive ink layer 55 having a mesh shape. . When forming the mesh-like positive image conductive ink layer 55, as understood from the top view of FIG. 1, the mesh-like metal conductive layer region (mesh-like) provided in a rectangular shape on the transparent substrate is used. (Positive pattern printing area) is formed by printing conductive ink in a mesh pattern, and the peripheral electrode area adjacent to the four sides of the mesh-shaped metal conductive layer area provided in the rectangular shape is formed with no conductive ink. Printing is provided, and the mesh pattern in the vicinity of the peripheral electrode area is printed with a line width larger than that of other parts, and is printed so as to be fused and connected to the adjacent peripheral electrode area. Provide. The mesh gap is a smaller gap corresponding to the increased line width. In the step (d) of FIG. 5, the transparent substrate thus printed is subjected to a drying process or a sintering process to form a mesh-like metal conductive layer 56 from the conductive ink layer 55. . Further, step (e) in FIG. 5 is optionally performed. In step (e) of FIG. 5, a metal plating layer 57 is formed on the mesh-like metal conductive layer 56 by performing electroplating or the like with a plating apparatus (not shown), and as a result, the metal layer is thickened.

  With this manufacturing method, the line width of the mesh in the vicinity of the peripheral electrode of the mesh-like metal conductive layer can be easily made larger than the line width of other regions. And the characteristic about the magnitude | size, distribution, etc. of the mesh line width in this invention mentioned above can be implement | achieved easily.

  Furthermore, in this manufacturing method, as understood from FIG. 3, by not printing a shape in which a substantially square mesh gap is cut in the middle at the connection portion between the mesh-shaped metal conductive layer and the peripheral electrode. The shape of the mesh from which the above-mentioned defect voids are removed can also be easily manufactured. By this combination, it is possible to more effectively prevent disconnection and breakage that are likely to occur during printing at the connection portion with the peripheral electrode.

  The shape of the mesh-shaped positive image is not particularly limited as long as the above-described conditions such as the mesh line width and the shape and size of the voids can be satisfied. In general, a mesh-shaped pattern, particularly a lattice-shaped pattern is suitable. ing. The shape of the gap may be a plane figure such as a substantially regular triangle, a substantially square, a substantially regular hexagon, other polygonal shapes, a circle, or an ellipse. From the viewpoint that a grid-like conductive layer is suitably formed and the aperture ratio is higher and the line width of the grid is more uniform, the formation of a substantially square void is preferable, and the approximately rhombus or substantially square void is particularly preferable. In the case where the mesh gap is substantially square, the length of one side is preferably in the range of 100 to 500 μm, particularly in the range of 150 to 400 μm, in the central portion of the mesh metal conductive layer, and the average line width of the mesh Is generally 5.0 to 50.0 μm, preferably 5.0 to 40.0 μm, and particularly preferably 10.0 to 30.0 μm. From the viewpoint of electromagnetic shielding properties, the thicker the line width, the better, but from the viewpoint of light transmission, the thinner the line width, the better. Then, in the vicinity of the peripheral electrode, the mesh line width is within a certain range from the peripheral electrode to be connected, preferably 3 to 50 mm, particularly preferably 5 to 20 mm. It is preferable to make it larger. Furthermore, the mesh line width in the vicinity of the peripheral electrode of the mesh-like metal conductive layer is connected to the peripheral electrode with a line width in the range of 2 to 10 times, particularly 2 to 4 times the line width of other regions. Is preferred. The value of the line width of the mesh in the vicinity of the peripheral electrode of a suitable mesh-like metal conductive layer varies depending on the value of the average line width at the center, but is larger than this, generally 10 to 500 μm, preferably 20 ˜300 μm, particularly preferably in the range of 30 to 100 μm. Further, it is preferable that the line width of the mesh in the vicinity of the peripheral electrode of the mesh-like metal conductive layer is increased continuously, preferably so as to be closer to the peripheral electrode to be connected.

  As the transparent substrate, any material can be used as long as it is transparent and can withstand the above-mentioned sintering. The transparent substrate already described above can be used, and PET is particularly preferable.

  As the conductive ink, various conductive inks can be used. For example, a coating / drying type or high-temperature sintering type conductive ink can be used. Examples of such conductive ink include a paste containing carbon black particles or metal and / or metal compound fine particles dispersed therein. As the coating and drying paste, a paste containing conductive fine particles, for example, fine particles such as carbon black, silver, copper, aluminum, and / or nickel, can be suitably used. From the viewpoint of conductivity and cost, silver or A paste containing copper fine particles is preferred. As the high-temperature sintering type paste, a conductive fine particle or a fine particle that becomes conductive by high-temperature sintering, for example, a paste containing fine particles of silver, copper, aluminum, nickel, silver oxide, organic silver compound, or gold is suitable. In view of conductivity and cost, a paste containing fine particles of silver, copper, silver oxide, and / or organic silver is preferable. The fine particles generally have a particle size of 1 μm or less, preferably 0.8 μm or less, and particularly preferably 0.6 μm or less for thinning the mesh pattern. A dispersion medium is used for the fine particle paste. As a dispersion medium for the coating and drying type paste, it is possible to use a higher solvent such as propylene glycol monoethyl ether, a general solvent such as an aromatic hydrocarbon such as xylene, and an aliphatic hydrocarbon. From the viewpoints of volatility and solubility, it is preferable to select a higher alcohol or aromatic hydrocarbon having a boiling point near 100 to 120 ° C. In addition to the dispersion medium, a binder resin can be used. Epoxy resin, urethane resin, ethyl cellulose, acrylic resin, polyester resin and the like can be used as the binder resin for the coating and drying type paste, and epoxy resin and urethane resin are preferable from the viewpoint of adhesion and resistance. As the dispersion medium for the high-temperature sintering type paste, for example, an organic solvent such as toluene, MEK, ethyl acetate or the like can be used. In addition, a binder resin can also be used in addition to the dispersion medium in the high-temperature sintered paste. As the binder resin for the high-temperature sintered paste, urethane resin, acrylic resin, or the like can be used. Moreover, a glass frit can be used as an additive.

  When using a high-temperature sintered paste as the conductive ink, it is necessary to sinter at a temperature lower than the durable temperature of the transparent substrate. When using a PET film or a PEN film as the transparent substrate, the step of sintering the conductive ink layer using a paste utilizing reduction of silver oxide and / or organic silver is performed at 80 to 160 ° C. Preference is given to sintering at a temperature in the range, in particular in the range from 100 to 155 ° C. By sintering at a temperature in this range, the metal conductive layer can be formed while maintaining the properties of the film. When using plate glass as a transparent substrate and creating a fine line pattern of 30 μm or less, using a paste utilizing reduction of silver oxide and / or organic silver, the step of sintering the conductive ink layer, Sintering at a temperature in the range of 80 to 240 ° C., particularly in the range of 100 to 220 ° C. is preferred. By sintering at a temperature in this range, a metal conductive layer having a fine line pattern of 30 μm or less can be formed on the plate glass while maintaining the properties of the plate glass.

  The mesh-like metal conductive layer formed by drying or high-temperature sintering treatment of the conductive ink layer can be further thickened as desired. By increasing the thickness, a further excellent electromagnetic shielding property can be obtained. The treatment for increasing the thickness of the metal conductive layer is preferably performed by plating, particularly electroplating. As the metal to be electroplated, it is generally possible to use copper, copper alloy, nickel, aluminum, silver, gold, zinc or tin, preferably copper, copper alloy, silver or nickel, especially From the viewpoint of economy and conductivity, it is preferable to use copper or a copper alloy. Thickening is performed to form a thickness that achieves appropriate electromagnetic wave shielding properties for the entire metal conductive layer, so depending on the thickness of the mesh-like metal conductive layer formed by drying or high-temperature sintering treatment of the conductive ink layer. The thickness of the appropriate thickness varies, but is generally in the range of 1-10 μm, preferably in the range of 2-8 μm. Particularly in the case of treatment with copper, it is preferably in the range of 3 to 6 μm. If the thickness of the metal conductive layer is less than 1 μm, the electromagnetic wave shielding property is insufficient, and if the plating thickness exceeds 10 μm, the plating layer tends to spread in the width direction, and the line width becomes thick, so the aperture ratio tends to decrease. is there.

  By using the light transmissive electromagnetic wave shielding window material of the present invention and the light transmissive electromagnetic wave shielding window material obtained by the production method of the present invention as an electromagnetic wave shielding layer, the light transmissive property, the electromagnetic wave shielding property and the visual recognition. And a display filter excellent in productivity can be manufactured. For example, a filter for PDP is prepared by an ordinary manufacturing method on a transparent substrate (transparent substrate), an antireflection layer, a light-transmitting electromagnetic wave shielding window material (electromagnetic wave shielding layer) obtained by the present invention, and a color correction filter layer. It can be obtained by laminating a near-infrared cut layer.

  Hereinafter, the present invention will be described with reference to examples. The present invention is not limited by the following examples.

[Example 1]
A polyvinyl alcohol resin (molecular weight 3000) and barium sulfate, which is a pigment, are dissolved in a mixed solution of water and methanol (mass ratio water: methanol = 1: 4) at a mass ratio of 1: 2, and a polyvinyl alcohol having a solid content of 35 wt% The solution was adjusted. Square dots were printed by gravure printing on a sheet-like PET (polyethylene terephthalate) film (length 1000 mm, width 780 mm, thickness 250 μm) using this solution as an ink. After drying this, copper was vacuum-deposited to obtain a copper layer having a thickness of 1000 mm. Subsequently, the dot part was dissolved and removed with water at room temperature, dried after washing with water, and a transparent film on which a mesh-like copper layer was formed was obtained. Details of the shape of the mesh are as follows.

  The dots are square in the middle of the film, each having a size of 234 μm per side, the distance between the dots is 20 μm, the dot arrangement is a square lattice, and the printed thickness of the dots is approximately after drying. It was 2 μm. Reflecting this accurately, the mesh-like copper layer had a square lattice shape corresponding to the negative pattern of dots, and the line width was 20 μm.

  In addition, the dot is a square shape with a size of one dot of 204 μm in the range of a width of 15 mm from the four sides to the center direction on the film surface, and the interval between the dots is 50 μm, The arrangement of the dots was a square lattice, and the printed thickness of the dots was about 2 μm after drying. Reflecting this accurately, the mesh-like copper layer had a line width of 50 μm in the range of 15 mm from the four sides on the film surface.

[Example 2]
The sheet-like PET film was treated in the same manner as in Example 1 to obtain a transparent film on which a 500-mm-thick mesh copper layer was formed. However, details of the shape of the mesh differ as follows.

  At the center of the film, as in Example 1, the size of one dot is a square shape with a side of 234 μm, the distance between the dots is 20 μm, the dot arrangement is a square lattice, and the printing thickness of the dots Was about 2 μm after drying. Reflecting this accurately, the mesh-like copper layer had a square lattice shape corresponding to the negative pattern of dots, and the line width was 20 μm.

  In addition, in the range of the width of 40 mm from the two opposite sides on the film surface to the central part direction, unlike Example 1, the size of one dot is 234 μm at a position of 40 mm from each side to the central part direction, The distance between the dots was 20 μm, and these continuously decreased as they approached each side. The distance between the dots was 204 μm at the end of the film, and the distance between the dots was 50 μm. The printed thickness of the dots was about 2 μm after drying. Reflecting this accurately, the mesh-like copper layer corresponds to the negative pattern of the dots, and the line width is 20 μm at a position of 40 mm from each side toward the center, and continuously increases as it approaches the side, It was 50 μm at the edge of the film.

  Furthermore, the obtained film was subjected to a plating treatment with a continuous plating apparatus to increase the thickness of the copper layer. The transparent film thus obtained was provided with a mesh-like copper layer having a thickness of 4 μm.

[Example 3]
The sheet-like PET film was treated in the same manner as in Example 1 to obtain a transparent film in which a mesh copper layer having a thickness of 4000 mm was formed. However, roll screen printing is used for printing, and details of the mesh shape are different as follows.

  At the center of the film, as in Example 1, the size of one dot is a square shape with a side of 234 μm, the distance between the dots is 20 μm, the dot arrangement is a square lattice, and the printing thickness of the dots Was about 2 μm after drying. Reflecting this accurately, the mesh-like copper layer had a square lattice shape corresponding to the negative pattern of dots, and the line width was 20 μm. Further, in the range of the width of 15 mm from the four sides on the film surface to the center part direction, the size of one dot is a square shape of 204 μm, the interval between the dots is 50 μm, and the dot arrangement is It was a square lattice and the printed thickness of the dots was about 2 μm after drying. Reflecting this accurately, the mesh-like copper layer had a line width of 50 μm within a range of 15 mm from two opposing sides on the film surface.

[Example 4]
On a sheet-like PET film (length 1000 mm, width 780 mm, thickness 250 μm), a silver-containing conductive paste (XA-9024, manufactured by Fujikura Kasei) was screen-printed to form a mesh-like conductive ink layer. . This film was baked at 150 ° C. for 60 minutes to obtain a transparent film on which a mesh-like metal conductive layer (film thickness after baking: 3 μm) was formed. The details of the shape of the printed mesh are as follows.

  At the center of the film, the mesh line width was 25 μm, and the lattice-shaped mesh gap was 229 μm.

  Further, in the range of the width of 50 mm from the four sides on the film surface to the center part direction, the mesh line width is 25 μm at the position of 50 mm from each side to the center part direction, and as the line width approaches each side. It increased continuously and was 60 μm at the edge of the film. The gap between the grid-like meshes was correspondingly small.

[Comparative Example 1]
In the same manner as in Example 1, a transparent film on which a mesh-like copper layer was formed was obtained.

  However, the printed dots have the same size and interval both at the center of the film surface and at the edge of the film surface, one size is a square with a side of 234 μm, and the interval between dots is 20 μm. The dot arrangement was a square lattice, and the printed thickness of the dots was about 2 μm after drying. Reflecting this, the mesh-like copper layer was a square lattice corresponding to the negative pattern of the dots at the center of the film surface and at the edge of the film surface, and the line width was 20 μm. .

[Comparative Example 2]
In the same manner as in Example 4, a transparent film having a mesh-like metal conductive layer was obtained.

  However, the printed mesh pattern has the same line width and gap both at the center of the film surface and at the edge of the film surface, the mesh line width is 25 μm, and the lattice mesh gap is 229 μm. there were.

[Evaluation and results]
The electric field shielding effect of the light-transmitting electromagnetic wave shielding window material was measured by the KEC method using a shielding characteristic evaluation apparatus (manufactured by Anritsu) under the condition of a frequency of 100 MHz, and the magnetic field shielding effect was measured in the same manner. Were evaluated and summarized in the following Table 1.

  The light transmissive electromagnetic wave shielding window materials of Examples 1 to 4 had excellent electromagnetic wave shielding properties as compared with the light transmissive electromagnetic wave shielding window materials of Comparative Examples 1 and 2.

  Further, a light-transmitting electromagnetic wave shield comprising a mesh-like metal conductive layer similar to the light-transmitting electromagnetic wave-shielding window material of Examples 1 to 4 and a peripheral electrode connected to the mesh-like metal conductive layer adjacent thereto. Light transmission comprising a conductive window material and a peripheral electrode connected to the mesh metal conductive layer adjacent to the mesh metal conductive layer similar to the light transmissive electromagnetic wave shielding window materials of Comparative Examples 1 and 2 The electromagnetic wave shielding window material was manufactured and compared. According to this comparison, the light-transmitting electromagnetic wave shielding window material provided with the same mesh-like metal conductive layer as in Examples 1 to 4 and provided with the peripheral electrode is broken or broken in the mesh near the boundary with the peripheral electrode during printing. The good shape was formed without generating. The metal mesh could be connected with a sufficiently low resistance via the peripheral electrode. On the other hand, the light-transmitting electromagnetic wave shielding window material provided with the mesh-like metal conductive layer similar to Comparative Examples 1 and 2 and provided with the peripheral electrode is a portion where the mesh is broken near the boundary between the mesh and the peripheral electrode. There were many window materials that could not exhibit sufficient shielding properties.

FIG. 1 is an explanatory view showing a typical example of the light-transmitting electromagnetic wave shielding window material of the present invention from above. FIG. 2 is an explanatory view showing a typical example of the light-transmitting electromagnetic wave shielding window material of the present invention in which peripheral electrodes are provided on two sides from above. FIG. 3 is an explanatory view showing another typical example of the light-transmitting electromagnetic wave shielding window material of the present invention having no voids from above. FIG. 4 is an explanatory view showing an example of the flow of the manufacturing method of the present invention by the soluble dot forming method, showing a cross section of a light-transmitting electromagnetic wave shielding window material. FIG. 5 is an explanatory diagram showing an example of the flow of the manufacturing method of the present invention by the positive tape printing method, showing a cross section of a light-transmitting electromagnetic wave shielding window material. FIG. 6 is an explanatory view showing a typical example of a light-transmitting electromagnetic wave shielding window material not according to the present invention from above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Light transmissive electromagnetic wave shielding window material 11 Peripheral electrode 12 Mesh-like metal conductive layer region 12a Mesh-like metal conductive layer 12b Mesh gap (mesh eyes)
12c Missing polygonal void (missing void)
20 Light-transmitting electromagnetic wave shielding window material 21 Peripheral electrode 22 Mesh-like metal conductive layer region 22a Mesh-like metal conductive layer 22b Mesh gap (mesh eyes)
22c Missing polygonal void (missing void)
30 Light-transmitting electromagnetic wave shielding window material 31 Peripheral electrode 32 Mesh-like metal conductive layer region 32a Mesh-like metal conductive layer 32b Mesh gap (mesh eyes)
41 Transparent substrate 42 Negative pattern printing layer 43 Metal conductive layer 44 Metal conductive layer of mesh positive image (mesh-like metal conductive layer)
51 transparent substrate 55 mesh-like positive conductive ink layer 56 mesh-like metal conductive layer 57 metal-plated layer 60 light-transmitting electromagnetic wave shielding window material 61 peripheral electrode 62 mesh-like metal conductive layer region 62a mesh-like metal conductive Layer 62b Mesh voids (mesh eyes)
62c missing void

Claims (20)

A rectangular transparent base material, a mesh-shaped metal conductive layer provided in a rectangular shape at least in the center on the transparent base material, and on the transparent base material adjacent to at least one side of the mesh-shaped metal conductive layer A light-transmitting electromagnetic wave shielding window material comprising a peripheral electrode provided and connected to the mesh-like metal conductive layer,
A light-transmitting electromagnetic wave shielding window material, characterized in that the mesh line width in the vicinity of the peripheral electrode of the mesh-like metal conductive layer is larger than the line width of other regions.   2. The light-transmitting electromagnetic wave shield according to claim 1, wherein the mesh in the vicinity of the peripheral electrode of the mesh-shaped metal conductive layer is a band-shaped region having a width within 3 to 50 mm from an end of the peripheral electrode to be connected. Window material.   3. The light-transmitting electromagnetic wave shielding window material according to claim 1, wherein a line width of a mesh in the vicinity of the peripheral electrode of the mesh-shaped metal conductive layer is larger as it is closer to the peripheral electrode to be connected.   4. The light transmission according to claim 1, wherein the peripheral electrode is provided adjacent to two opposite sides or four sides of the four sides of the mesh-shaped metal conductive layer. Electromagnetic shielding window material.   The line width of the mesh in the vicinity of the peripheral electrode of the mesh-shaped metal conductive layer is in the range of 2 to 10 times as compared with the line width of the other region. The light-transmitting electromagnetic wave shielding window material described.   The light-transmitting electromagnetic wave shielding window material according to any one of claims 1 to 5, wherein the mesh is a repetition of polygonal meshes.   The light-transmitting electromagnetic wave shield according to claim 6, wherein the polygon constituting the mesh eye in the vicinity of the peripheral electrode is free from or substantially free of a polygon whose shape is lost by the peripheral electrode. Window material.   The light-transmitting electromagnetic wave shielding window material according to any one of claims 1 to 7, wherein the metal conductive layer contains a conductive metal and / or metal oxide.   The light-transmitting electromagnetic wave shielding window material according to claim 1, wherein the metal conductive layer contains copper and / or silver.   The light-transmitting electromagnetic wave shielding window material according to claim 1, wherein the transparent substrate is a resin film.   The light-transmitting electromagnetic wave shielding window material according to claim 1, wherein the transparent substrate is a PET film.   The light-transmitting electromagnetic wave shielding window material according to claim 1, wherein the transparent base material is a plate glass.   A display filter comprising the light-transmitting electromagnetic wave shielding window material according to claim 1. A rectangular transparent base material, a mesh-shaped metal conductive layer provided in a rectangular shape at least in the center on the transparent base material, and on the transparent base material adjacent to at least one side of the mesh-shaped metal conductive layer A light-transmitting electromagnetic wave shielding window material comprising a peripheral electrode provided and connected to the mesh-like metal conductive layer, the following steps:
A negative image of a mesh pattern in a rectangular shape at least in the center on the transparent substrate,
Adjacent to at least one side of the rectangular area of the negative image, leaving a non-printing area for forming the peripheral electrode,
In the neighboring region adjacent to the non-printing region in the rectangular region of the negative image, the polygon corresponding to each mesh is a polygon having an area smaller than the other regions in the negative image region. like,
Forming the negative pattern printing layer by printing using a solvent-soluble ink;
Forming a metal conductive layer insoluble in the solvent on the surface of the transparent substrate on which the negative pattern printing layer is formed;
The surface of the transparent substrate on which the metal conductive layer is formed is washed with a solvent capable of dissolving the negative pattern print layer, thereby removing the negative pattern print layer and the metal conductive layer on the negative pattern print layer. And forming a mesh-like metal conductive layer,
A method of manufacturing by the method characterized by including.   The manufacturing method according to claim 14, wherein the polygon corresponding to each mesh is not printed at a position in contact with the non-printing area. Forming a metal conductive layer insoluble in a solvent on the surface of the transparent substrate on which the negative pattern printing layer is formed,
The manufacturing method according to claim 14 or 15, wherein the method is carried out by a vapor phase film forming method of a metal and / or a metal compound. A rectangular transparent base material, a mesh-shaped metal conductive layer provided in a rectangular shape at the center of the transparent base material, and provided on the transparent base material adjacent to at least one side of the mesh-shaped metal conductive layer And a peripheral electrode connected to the mesh-like metal conductive layer, and a light-transmitting electromagnetic wave shielding window material comprising the following steps:
In order to provide a positive image of a mesh pattern in a rectangular region at least in the central part on the transparent substrate,
Adjacent to at least one side of the positive image region of the mesh-like pattern, connected to a mesh line, and provided with a band-like peripheral electrode pattern along the side,
The mesh line in the vicinity of the peripheral electrode pattern in the mesh pattern image region is a line having a larger line width than other portions in the mesh pattern image region.
Forming a conductive ink layer by printing using a conductive ink;
By drying and / or sintering the conductive ink layer, the mesh-like metal conductive layer is removed from the conductive ink layer of the mesh pattern image, and the conductive ink layer on the peripheral electrode pattern is peripheral. Forming an electrode;
A method of manufacturing by the method characterized by including. In the step of forming the conductive ink layer,
The manufacturing method according to claim 17, wherein the conductive ink is formed in the vicinity of the peripheral electrode pattern without providing a mesh gap in contact with the peripheral electrode pattern.   A light-transmitting electromagnetic wave shielding window material obtained by the production method according to claim 14. A display filter comprising the light-transmitting electromagnetic wave shielding window material according to claim 19.

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