JP2007103426A - Long optical filter, single optical filter and method of manufacturing same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long optical filter by which a grounding terminal can be easily joined to a metal mesh, an individual optical filter which is segmented from the long optical filter, and a method of manufacturing the same. <P>SOLUTION: The long optical functional filter is provided with an electromagnetic wave shielding layer, an adhesive layer and a long upper sheet, and a number of electromagnetic wave shielding layers are formed in the lengthwise direction. The electromagnetic wave shielding layers are arranged on a transparent substrate sheet a specified distance away from both ends thereof in the direction of width and at a spacing in the lengthwise direction, and square metal meshes are stacked thereon. The adhesive agent of the adhesive layer covers the metal mesh but at least two sides of the periphery of the metal mesh, and the adhesive layer is provided with a band-like section without the adhesive agent among the adjoining metal meshes wherein the periphery of the metal mesh is being exposed. The upper sheet is equivalent to or larger than the width of the adhesive layer, and it is stacked in a manner to continuously cover a plurality of the adhesive layers. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical filter that can be directly attached to a display panel of an electronic device such as a plasma display panel, and is an elongated filter that can be manufactured continuously in a roll-to-roll manner. provide.

  In recent years, plasma display devices have been developed and commercialized for use in large thin televisions, thin display applications, and the like. Since electromagnetic waves are generated from a display such as this plasma display device, it is required to reduce the intensity of electromagnetic wave emission within the standard in consideration of the influence on the human body. In addition, because of the structure of the plasma display device, near-infrared rays that cause malfunctions to other devices or that affect the operation of remote control and neon light that affects the color tone are emitted from the inside of the display, thus blocking them. There is a need to.

  In view of these requirements, various filters have already been developed for directly attaching to the surface of the plasma display panel.For example, an antireflection layer is formed on the glass surface, and an electromagnetic wave shielding layer is attached to the back surface. The separate film on one side of the laminate composed of a separate film / adhesive layer / separate film is peeled off and bonded onto the electromagnetic shielding layer, and the adhesive is pushed into the metal mesh layer of the electromagnetic shielding layer, and then the adhesive There has been a method in which a near-infrared cut film is bonded through an agent layer and air bubbles are removed by an autoclave. The autoclave process had to be performed for each sheet, and the processing efficiency was low. In the said method, what contained pigment | dye and pigments, such as a neon cut material and a color tone adjustment material, was used for the adhesive.

In FIG. 7 and paragraph [0037] of JP-A-2005-107345 (Patent Document 1), a laminate comprising an electromagnetic wave shielding layer / dye-containing pressure-sensitive adhesive layer / antireflection film is wound in a roll shape. It is shown. The optical filter formed using the laminated body described in Patent Document 1 is formed by arranging a large number of metal mesh layers of 50 μm □ to 500 μm □ in the longitudinal direction.
JP-A-2005-107345

  However, each optical filter cut out from a long optical filter manufactured using a laminate composed of a long electromagnetic shielding layer / dye-containing pressure-sensitive adhesive layer / antireflection film of Patent Document 1 is a metal mesh. Since the pressure-sensitive adhesive layer covering the layers is continuously formed in the longitudinal direction, and the antireflection film laminated on the pressure-sensitive adhesive layer is also laminated continuously in the longitudinal direction. The cut surfaces of the prevention film and the pressure-sensitive adhesive layer are flush with each other.

  In the case of having such a cross section of the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer must be removed in order to join the ground terminal to the metal mesh layer, and the process is complicated.

  Therefore, the present invention provides a long optical filter that can easily join a ground terminal to a metal mesh layer, and provides individual optical filters obtained by cutting out the long optical filter and their manufacture. It aims to provide a method.

  As a result of repeated studies to solve the above problems, the present inventor intermittently applied a pressure-sensitive adhesive to form a pressure-sensitive adhesive layer, and the periphery of the metal mesh layer is between adjacent metal mesh layers. A plurality of pressure-sensitive adhesive layers are formed in a strip shape having a portion where no pressure-sensitive adhesive exists in an exposed state, and a long upper sheet that is equal to or wider than the width of the pressure-sensitive adhesive layer is used. It has been found that the above-mentioned problems can be solved by covering continuously.

  1st invention which solves an above-mentioned subject is an elongate optical function filter which has an electromagnetic wave shielding layer, an adhesive layer, and a long upper sheet about a long optical filter in which many electromagnetic wave shielding layers are formed, (1) A plurality of the electromagnetic wave shielding layers are arranged on the transparent substrate sheet at a certain distance from both ends in the width direction and spaced in the longitudinal direction. (2) The pressure-sensitive adhesive layer covers the metal mesh layer with the pressure-sensitive adhesive filled inside the metal mesh layer, but covers at least two sides of the metal mesh layer. In addition, a plurality of pressure-sensitive adhesive layers having a portion where no pressure-sensitive adhesive is present in a band shape with the periphery of the metal mesh layer exposed between adjacent metal mesh layers are laminated ( 3) The upper sheet has the viscosity Width equal to or wider the adhesive layer, an elongated optical filter characterized by having a plurality of optical filters upper sheet is laminated so as to continuously cover a plurality of pressure-sensitive adhesive layer.

  A second invention is a long optical filter according to the first invention, wherein the upper sheet is a separate film.

  A third invention is a long optical filter according to the first invention, wherein the upper sheet is an antireflection film.

  4th invention is a near-infrared absorptivity in the said 1st-3rd invention between the said adhesive layer and the said upper side sheet | seat, or the surface on the opposite side to the metal mesh layer side of a transparent base material sheet, A long optical filter having one or two or more functional layers having one or two or more functions selected from ultraviolet absorption ability, impact resistance, neon light blocking ability, and color adjustment ability .

  5th invention is the said 1st-3rd invention WHEREIN: The said adhesive layer is 1 type or 2 types chosen from near-infrared absorptivity, ultraviolet absorptivity, impact resistance, neon light blocking ability, and color adjustment ability It is a long optical filter characterized by having the above functions.

  A sixth invention is a long optical filter which is wound into a roll shape in the first to fifth inventions.

  A seventh invention relates to an optical filter having an electromagnetic wave shielding layer, and is an optical functional filter having an electromagnetic wave shielding layer, an adhesive layer, and an upper sheet, wherein (1) the electromagnetic wave shielding layer is formed on a transparent substrate sheet. A rectangular metal mesh layer is laminated at a certain distance from the ends of the four sides. (2) The pressure-sensitive adhesive layer is a metal in a state where the pressure-sensitive adhesive is filled in the metal mesh layer. The mesh layer is covered, but is formed so as not to cover at least three sides of the metal mesh layer, and (3) the periphery of the upper sheet is equal to or more than the periphery of the pressure-sensitive adhesive layer. And at least two sides of the upper sheet are larger than the width of the pressure-sensitive adhesive layer, and are laminated on the pressure-sensitive adhesive layer.

  The eighth invention is characterized in that the long optical filter of the first invention to the sixth invention is cut for each optical filter, which is the seventh optical filter.

  The ninth invention relates to a method for producing an optical filter. (1) On a long transparent substrate sheet, a rectangular metal with a certain distance from both ends in the width direction and spaced in the long direction. An electromagnetic wave shielding layer is formed by laminating a plurality of mesh layers, and (2) an electromagnetic wave is applied by intermittently applying an adhesive on the electromagnetic wave shielding layer so as to fill the inside of the metal mesh layer of the electromagnetic wave shielding layer. Covers the shielding layer, does not cover at least two sides of the metal mesh layer, and there is no adhesive in the form of a band between the adjacent metal mesh layers with the metal mesh layer exposed. Forming a plurality of pressure-sensitive adhesive layers having a portion, (3) by continuously covering the plurality of pressure-sensitive adhesive layers using a long upper sheet that is equal to or wider than the width of the pressure-sensitive adhesive layer; Multiple optical filters Characterized in that it.

  A tenth invention is a method for producing a long optical filter in the ninth invention, wherein the upper sheet is a separator film. .

  An eleventh invention is a method for producing a long optical filter in the ninth invention, wherein the upper sheet is an antireflection film.

  A twelfth invention is the ninth to eleventh invention, wherein the near-infrared absorptivity is provided between the pressure-sensitive adhesive layer and the upper sheet or on the surface opposite to the metal mesh layer side of the transparent base sheet. Manufacture of a long optical filter having one or two or more functional layers having one or more functions selected from ultraviolet absorption ability, impact resistance, neon light blocking ability, and color adjustment ability Is the method.

  A thirteenth invention is the ninth invention to the eleventh invention, wherein the pressure-sensitive adhesive layer is one or two selected from near-infrared absorbing ability, ultraviolet absorbing ability, impact resistance, neon light blocking ability, and color adjusting ability. It is a manufacturing method of a long optical filter characterized by having the above function.

  A fourteenth invention is a method for producing a long optical filter according to any one of the ninth to thirteenth inventions, wherein the long optical filter is wound into a roll.

  A fifteenth aspect of the invention is the manufacture of an optical filter according to any of the ninth to fourteenth aspects of the invention, wherein the long optical filter obtained by the method for manufacturing a long optical filter is cut to obtain a single-wafer optical filter. Is the method.

  According to the first invention, the pressure-sensitive adhesive layer does not cover at least two sides of the periphery of the metal mesh layer, and adheres in a strip shape with the periphery of the metal mesh layer exposed between adjacent metal mesh layers. Since there is a part where the agent does not exist, when cutting between adjacent metal mesh layers, only the periphery of the upper sheet is peeled off, and the periphery of the metal mesh layer without adhesive is exposed. In addition, it is possible to provide a long optical filter that can easily attach a ground to the periphery of the metal mesh layer.

  According to the second invention, in addition to the effect of the first invention, since the upper sheet is a separate film, it is possible to provide a long optical filter capable of appropriately peeling the separate film.

  According to the third invention, in addition to the effects of the first invention, since the upper sheet is an antireflection film, it is possible to provide a long optical filter imparted with antireflection properties.

  According to 4th invention and 5th invention, in addition to the effect of 1st invention-3rd invention, 1 type chosen from near-infrared absorptivity, ultraviolet absorptivity, impact resistance, neon interruption | blocking capability, and color tone adjustment function Alternatively, a long optical filter having two or more functions can be provided.

  According to the sixth aspect of the invention, since the roll-shaped long optical filter can be provided, the manufacturing process of the long optical filter can be continued, or the handleability, transportability, and storage can be improved. In addition, the use of a roll-like long optical filter, particularly in the process of attaching to a display surface, improves handling and opens the possibility of adopting a continuous process.

  According to the seventh invention, since the pressure-sensitive adhesive layer does not cover at least three sides of the periphery of the metal mesh layer, only the periphery of the upper sheet is peeled off, and at least three sides of the metal mesh layer to which no pressure-sensitive adhesive is attached An optical filter can be provided in which the periphery is exposed and the ground can be easily attached to the periphery of the metal mesh layer.

  According to the eighth invention, the long optical filter of the first to sixth inventions can be cut into individual optical filters to form a single optical filter.

  According to the ninth invention, the pressure-sensitive adhesive layer does not cover at least two sides of the periphery of the metal mesh layer, and adheres in a strip shape with the periphery of the metal mesh layer exposed between adjacent metal mesh layers. Since the part where the agent does not exist is formed, when cutting between adjacent metal mesh layers, only the periphery of the upper sheet is peeled off, and the periphery of the metal mesh layer without adhesive is exposed. In addition, it is possible to provide a method for manufacturing a long optical filter that can easily attach a ground to the periphery of the metal mesh layer.

  According to the tenth invention, in addition to the effect of the ninth invention, since the upper sheet is a separate film, it is possible to provide a method for producing a long optical filter capable of appropriately separating the separate film.

  According to the eleventh invention, in addition to the effect of the ninth invention, a method for producing a long optical filter when the upper sheet is an antireflection film can be provided.

  According to the twelfth and thirteenth inventions, in addition to the effects of the ninth to eleventh inventions, the infrared ray absorbing ability, ultraviolet absorbing ability, impact resistance, neon light blocking ability, and color adjusting function are selected. A method for producing a long optical filter having one or two or more functions can be provided.

  According to the fourteenth invention, in addition to the effects of the ninth to thirteenth inventions, a method for producing a long optical filter in a roll shape can be provided.

  According to the fifteenth aspect, in addition to the effects of the ninth to thirteenth aspects, a method for manufacturing a single-wafer optical filter can be provided.

  FIG. 1 shows a schematic diagram of the production process of the long optical filter of the present invention. This manufacturing process shows only one example of manufacturing a long optical filter, and various modifications can be made according to the spirit of the present invention. Process A shows the feed process of the raw material which consists of the metal mesh layer 2 formed in the transparent base material sheet 1 shape. Process B shows the process of intermittently applying an adhesive with a coating device such as a slit or die. Process C shows a drying process. Step D shows a step of laminating an upper sheet such as an antireflection film or a separate film. Process E shows the lamination process of the adhesive layer for affixing on the display surface. Process F shows the winding process of the formed long film.

(Process A): Sending process The raw material wound by the roll shape of the elongate sheet | seat of the electromagnetic wave shielding layer which consists of a metal mesh layer laminated | stacked on the transparent base film is prepared. FIG. 2 shows a laminated structure of the original fabric used in step A. 1 is a transparent substrate sheet, and 2 is a metal mesh layer formed on the transparent substrate sheet 1.

  The electromagnetic wave shielding layer has a function of shielding electromagnetic waves generated from a plasma display or the like, and is typically formed by etching a metal foil such as copper into a mesh shape. The observation side of the layer 2 is blackened with chromium oxide or the like. Since it is obtained by laminating a copper foil on a polyester film or the like and then etching, it is usually constituted by being backed by a transparent substrate sheet 1 such as a film. The transparent substrate sheet 1 is shielded from electromagnetic waves having a laminated structure. It is a part of layers constituting the layer.

(Process B): Intermittent application process of adhesive The electromagnetic wave shielding layer is covered by coating the adhesive inside the metal mesh layer 2 of the electromagnetic wave shielding layer by coating using a coating device such as a slit or a die. And, by applying the adhesive intermittently, at least two sides of the periphery of the metal mesh layer 2 are not covered, and the periphery of the metal mesh layer 2 is between the adjacent metal mesh layers 2. A plurality of pressure-sensitive adhesive layers 3 having a strip-like portion where no pressure-sensitive adhesive is present are formed in an exposed state. In FIG. 3, the state which formed the adhesive layer 3 on the electromagnetic wave shielding layer used at the process A is shown. By coating the metal mesh layer 2 so that at least two sides of the periphery of the metal mesh layer 2 are not covered and the periphery of the metal mesh layer 2 is exposed between the adjacent metal mesh layers 2, Even in the case of lamination, it is possible to easily connect the ground terminal to the periphery of the metal mesh layer 2 simply by turning the end portion of the upper sheet.

  A coating apparatus such as a general slit or die can be used as a coating apparatus that performs intermittent coating. For example, apparatuses described in JP-A-10-76209, JP-A-2001-38276, and 2003-300002 can also be used.

  By including a known substance having one or two or more functions selected from near-infrared absorbing ability, ultraviolet absorbing ability, impact resistance, neon light blocking ability, and color adjusting ability in the adhesive, these One type or two or more types of functions may be imparted to the pressure-sensitive adhesive layer 3.

  Examples of the adhesive material constituting the adhesive layer 3 include acrylic resin, polyester resin, polyurethane resin, polyvinyl alcohol alone or a partially saponified product thereof, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, polyimide. Examples thereof include resins, epoxy resins, polyurethane ester resins, and the like. Further, an ionizing radiation curable type such as an ultraviolet curable type or a thermosetting type may be used. Moreover, the adhesive layer 3 in this invention may be comprised using the adhesive. It is also preferable to use an acrylic resin or a polyester resin from the viewpoint of compatibility with the near-infrared absorbing dye and / or neon light absorbing dye, dispersibility, and the like.

(Step C): Drying step The solvent contained in the pressure-sensitive adhesive layer 3 is dried and blown off to improve the adhesion with the upper sheet described later.

(Process D): Lamination process of upper sheet The upper sheet 4 having an adhesive layer (not shown) protected by a separate film is laminated on the electromagnetic wave shielding layer side while peeling the separate film, thereby making it easy to handle. It is possible to impart a function such as antireflection performance and antireflection performance. For the upper sheet 4, a separate film, an antireflection film, or the like can be used. In FIG. 4, the state which laminated | stacked the upper sheet | seat 4 on the dried adhesive layer 3 formed at the process C is shown.

The antireflection film is one in which an antireflection layer is formed on a transparent substrate film, and the antireflection layer is typically a laminate in which a high refractive index layer and a low refractive index layer are laminated in order, Some have other laminated structures. The high refractive index layer is, for example, a thin film of ZnO or TiO ₂ material, or a transparent resin film in which fine particles of these materials are dispersed. Further, the low refractive index layer, a thin film made of SiO ₂ or SiO ₂ gel film or a fluorine-containing, or a transparent resin film of fluorine and silicon-containing. Since the antireflection layer is laminated, it is possible to reduce reflection of unnecessary light such as external light on the laminated side, and to increase the contrast of the image or video of the applied display.

(Process E): Lamination process of an adhesive layer The adhesive layer 5 for attaching directly to various displays, such as a plasma display, is laminated | stacked on the transparent base material sheet 1 side of an electromagnetic wave shielding layer. The pressure-sensitive adhesive layer 5 is formed by laminating a laminate sheet composed of a separate film / pressure-sensitive adhesive layer 5 / separate film on the transparent substrate sheet 1 side of the electromagnetic wave shielding layer while peeling one of the separate films. In FIG. 5, the state which laminated | stacked the adhesive layer 5 for affixing on various displays directly on the transparent base material sheet 1 side of the electromagnetic wave shielding layer of the lamination sheet formed at the process D is shown. As the pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer 5, the pressure-sensitive adhesive shown in the description of the step B can be used.

(Step F): Winding step Since the long optical filter manufactured in Step E is a separate film on one side and is covered with the upper sheet on the other side, it is easy to cause no blocking. Winding is possible.

Electromagnetic wave shielding layer:
The electromagnetic wave shielding layer has a laminated structure in which a transparent substrate, an adhesive layer (not shown), and a metal mesh layer are laminated in this order.

(Metal mesh layer)
The metal mesh layer is a part of a layer constituting the electromagnetic wave shielding layer having a laminated structure. The metal mesh layer used in the present invention has a function of shielding electromagnetic waves generated from a plasma display or the like. Such a metal mesh layer is formed by laminating a metal foil on a transparent substrate, which will be described later, with an adhesive layer and etching the metal foil into a mesh shape. In the present invention, the metal mesh layer is not particularly limited as long as it has electromagnetic wave shielding properties. For example, copper, iron, nickel, chromium, aluminum, gold, silver, Stainless steel, tungsten, titanium, or the like can be used. In the present invention, among the above, copper is preferable from the viewpoints of electromagnetic shielding properties, etching processing suitability, and handling properties. Moreover, as a kind of copper foil used, although rolled copper foil, electrolytic copper foil, etc. are mentioned, it is especially preferable that it is electrolytic copper foil. As a result, a uniform metal mesh layer having a thickness of 10 μm or less can be obtained, and when the surface of the metal mesh layer is blackened, the adhesion with chromium oxide and the like is good. Because it can be.

  Here, in the present invention, it is preferable that one side or both sides of the metal foil is blackened. The blackening process is a process of blackening the surface of the metal mesh layer with chromium oxide or the like. In the optical filter, the oxidation-treated surface is arranged to be a surface on the viewer side. The external light on the surface of the optical filter is absorbed by chromium oxide or the like formed on the surface of the metal mesh layer by this blackening treatment, so that it is possible to prevent light from being scattered on the surface of the optical filter and to achieve good transmission. Therefore, the optical filter can be obtained. Such a blackening treatment can be performed by applying a blackening treatment liquid to the metal foil.

  As a blackening treatment method, different oxycarboxylic acid compounds such as tartaric acid, malonic acid, citric acid and lactic acid are added to CrO2 aqueous solution or chromic anhydride aqueous solution, and a part of hexavalent chromium is reduced to trivalent chromium. The applied solution can be applied by a roll coating method, an air curtain method, an electrostatic atomization method, a squeeze roll coating method, a dipping method or the like and dried. In addition, this blackening process may be performed after a metal foil is bonded to a transparent substrate with an adhesive layer or an adhesive layer and etched into a mesh shape.

  The black density on the surface of the blackened metal foil is preferably 0.6 or more. This is because the non-visibility can be further improved. Here, the black density is set to a density standard ANSI T as an observation viewing angle of 10 °, an observation light source D50, and an illumination type using GRETAG SPM100-11 (manufactured by KIMOTO) of COLOR CONTROL SYSTEM. It is a value measured after the ration.

  The film thickness of the metal foil is preferably in the range of 1 μm to 100 μm, more preferably in the range of 5 μm to 20 μm. If the film thickness is thicker than the above range, it is difficult to make the pattern line width fine and fine by etching, and if the film thickness is thinner than the above range, sufficient electromagnetic shielding properties cannot be obtained.

  Furthermore, it is preferable that the said metal foil has the 10-point average roughness based on JISB0601 in the range of 0.5 micrometer-10 micrometers. When it is smaller than the above range, even when the blackening treatment is performed, the external light on the surface of the optical filter is specularly reflected, so that the visibility is deteriorated. This is because it becomes difficult to apply the resist or the resist.

  Here, the etching of the metal foil is performed after the metal foil is bonded to the transparent substrate described later via an adhesive layer or an adhesive layer. This etching can be performed by an ordinary photolithography method. For example, the resist can be applied to the surface of the metal foil, dried, and then exposed to light with a pattern plate and developed.

The above-described metal mesh layer used in the present invention preferably has a surface resistance in the range of 10 ⁻⁶ Ω / □ to 5 Ω / □, and more preferably in the range of 10 ⁻⁴ Ω / □ to 3Ω / □. . In general, the electromagnetic wave shielding property can be measured by surface resistance. It can be said that the lower the surface resistance, the better the electromagnetic wave shielding property. Here, the value of the surface resistance is measured by the method described in JIS K7194 “Resistivity test method using 4-probe method of conductive plastics” by the surface resistance measuring device Lorester GP, manufactured by Dia Instruments Co., Ltd. Value.

  The metal mesh layer after the etching treatment is preferably in the range of 50 μm □ to 500 μm □, more preferably in the range of 100 μm □ to 400 μm □, and particularly preferably in the range of 200 μm □ to 300 μm □. Is preferably in the range of 5 μm to 20 μm. When the mesh line width is finer than the above range, disconnection may occur, which is not preferable from the aspect of electromagnetic shielding properties, and when the mesh line width is thicker than the above range, the visible light transmittance is low, for example, This is because the brightness of the plasma display is not preferable.

Transparent substrate:
The transparent substrate is a part of the layer constituting the electromagnetic wave shielding layer having a laminated structure. The transparent substrate used in the present invention is not particularly limited as long as it has transparency and an adhesive layer can be formed. For example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN) ) Polyesters, cyclic polyolefins, polyolefins such as polyethylene, polypropylene and polystyrene, vinyl resins such as polyvinyl chloride and polyvinylidene chloride, polycarbonates, acrylic resins, triacetyl cellulose (TAC), polyethersulfone, poly A film made of ether ketone and having a light transmittance of 80% or more in the visible region can be mentioned.

  These films may be colored as long as they do not interfere with the object of the present invention, and can be used as a single layer, but may be used as a multilayer film in which two or more layers are combined. Among these, PET is most preferable from the viewpoints of transparency, heat resistance, cost, and handleability. It is desirable that the light transmittance in the visible region is as high as possible. However, since the light transmittance of 50% or more is required for the final product, even when at least two sheets are laminated, the transparent substrate has 80%. This is because it suits the purpose. Since the higher the transmittance, the more transparent substrates can be laminated, the light transmittance is preferably 85% or more, and most preferably 90% or more. Therefore, it is also an effective means to reduce the thickness. It is. The thickness of the transparent substrate is not particularly limited as long as the transparency is satisfied, but is preferably in the range of 12 μm to 300 μm from the viewpoint of workability. If the thickness is less than 12 μm, the film is too flexible, and the metal mesh layer, which is a conductive layer, is easily stretched and wrinkled due to the tension during film formation and processing. . If it exceeds 300 μm, the flexibility of the film decreases, and continuous winding in each step is difficult and unsuitable. Furthermore, when laminating a plurality of sheets, there is a problem that workability is greatly deteriorated.

Adhesive layer:
Although not shown in FIGS. 1 to 5, the adhesive layer is a layer used to bond the transparent substrate and the metal foil. The type of the adhesive layer is not particularly limited as long as the adhesive layer is a layer capable of bonding the metal mesh layer and the transparent base material. In the present invention, the metal mesh layer is configured. Since the metal foil and the transparent base material are bonded together via the adhesive layer, and then the metal foil is meshed by etching, the adhesive layer preferably has etching resistance. Specifically, acrylic resin, polyester resin, polyurethane resin, polyvinyl alcohol alone or partially saponified product thereof, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, polyimide resin, epoxy resin, polyurethane ester resin Etc. The adhesive layer used in the present invention may be an ultraviolet curable type or a thermosetting type. In particular, an acrylic resin or a polyester resin is preferable from the viewpoints of adhesion to a transparent substrate, compatibility with near-infrared absorbing dyes and / or neon light absorbing dyes, dispersibility, and the like.

  Further, the adhesive layer may contain one or more near infrared absorbing dyes and / or neon light absorbing dyes. In that case, it is preferable that the light transmittance in the near infrared region is 20% or less, particularly 10% or less, and the light transmittance at 570 to 600 nm is 30% or less, especially 25% or less. Furthermore, the hydroxyl value and acid value of the resin must each be 10 or less. Thereby, it is possible to prevent the near-infrared absorbing dye and / or the neon light-absorbing dye from reacting with the reactive group in the resin due to the hydroxyl group and acid contained in the resin, stably absorbing near-infrared light, and / or Alternatively, the neon light absorbing function can be exhibited.

  The transparent substrate and the metal foil for forming the metal mesh layer can be bonded via the adhesive layer by a dry lamination method or the like. Moreover, it is preferable that the film thickness of this adhesive bond layer is in the range of 0.5 μm to 50 μm, especially 1 μm to 20 μm. Thereby, a transparent base material and a metal mesh layer can be firmly bonded, and the transparent base material is prevented from being affected by an etching solution such as iron oxide during etching to form the metal mesh layer. Because it can.

Adhesive layer:
As shown in FIGS. 1 to 5, the pressure-sensitive adhesive layer 3 used in the optical filter of the present invention is a layer for flattening the unevenness of the metal mesh layer having the electromagnetic wave shielding properties described above. It has a function of preventing the transparency of the optical filter from being lowered by the unevenness. In addition, the etching performed when forming the metal mesh layer can improve the transparency that is deteriorated due to deterioration of the surface of the adhesive layer, and also prevent irregular reflection of the cross section when the metal mesh layer is viewed obliquely. Is possible. The type of the pressure-sensitive adhesive layer used in the present invention is not particularly limited as long as it is a layer that can flatten the unevenness of the metal mesh layer, but in the present invention, the resin used for the pressure-sensitive adhesive layer The glass transition temperature (Tg) of is preferably in the range of 30 ° C to 150 ° C, and more preferably in the range of 40 ° C to 120 ° C. Accordingly, when the resin is dissolved in a solvent and applied onto the metal mesh layer, and the solvent is volatilized and dried, the unevenness formed by the unevenness of the metal mesh layer on the surface is equal to or greater than the Tg of the transparent substrate. This is because, for example, it can be flattened by applying pressure using a mirror roll or the like, and a high-quality optical filter with high transparency can be obtained. The temperature and pressure in the step of flattening the pressure-sensitive adhesive layer are appropriately selected depending on the type of the transparent resin, but are usually in the range of 50 ° C. to 170 ° C., and the pressure is a linear pressure of 0.1 kg. / Cm ^{2 to} 10 kg / cm ² is preferable.

  Specific examples of the resin having the above-described properties include acrylic resins, ester resins, polycarbonate resins, urethane resins, cyclic polyolefin resins, polystyrene resins, polyimide resins, or polytetrafluoroethylene. (PTFE), perfluoroalkoxy resin (PFA) made of a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, tetrafluoroethylene and hexafluoropropylene copolymer (FEP), tetrafluoroethylene and perfluoroalkyl vinyl ether and hexafluoropropylene copolymer ( EPE), copolymers of tetrafluoroethylene and ethylene or propylene (ETFE), polychlorotrifluoroethylene resin (PCTFE), ethylene and chlorine Fluoropolymers such as copolymer with trifluoroethylene (ECTFE), vinylidene fluoride resin (PVDF), and vinyl fluoride resin (PVF) can be mentioned. Among them, acrylic resins and ester resins are preferred from the viewpoint of transparency. A resin or a polycarbonate-based resin is preferable. The average molecular weight of the resin is preferably in the range of 500 to 600,000, particularly 10,000 to 400,000. This is because a transparent resin having the above properties can be obtained.

  In this invention, it is preferable that the film thickness of such an adhesive layer has the film thickness of the part in which the metal mesh layer is not formed in the range of 10 micrometers-50 micrometers. This is because the unevenness of the metal mesh layer can be flattened.

  The pressure-sensitive adhesive layer of the optical filter of the present invention may contain one or more near-infrared absorbing dyes and / or neon light absorbing dyes. In that case, it is preferable that the light transmittance in the near infrared region is 20% or less, particularly 10% or less, and the light transmittance at 570 to 600 nm is 30% or less, especially 25% or less. Furthermore, the hydroxyl value and / or acid value of the resin must be 10 or less, respectively. As a result, it is possible to prevent the near-infrared absorbing dye and / or neon light-absorbing dye from reacting with the hydroxyl group and acid group contained in the resin, and stably absorb near-infrared and / or neon light absorption. The function can be exhibited.

  The pressure-sensitive adhesive layer 5 formed on the transparent base sheet 1 opposite to the metal mesh layer 2 side is a pressure-sensitive adhesive sheet, for example, a commercially available double-sided adhesive tape (eg, CS-9611: trade name, Nitto Denko Corporation). Can also be used.

Antireflection layer or antireflection film:
Antireflection performance can be imparted by laminating an antireflection layer or an antireflection film on the outermost surface of the optical filter of the present invention. The antireflection layer can be formed by a coating method, a vapor phase method such as vapor deposition, or a transfer method, and the antireflection film can be laminated by bonding together those prepared in advance.

  As for the antireflection layer, it is possible to adopt a bocus method by scattering or diffusing light like polished glass. That is, in order to scatter or diffuse light, it is fundamental to roughen the light incident surface. For this roughening treatment, the surface of the substrate is directly roughened by a sandblasting method or an embossing method. A method of providing a roughened layer containing an inorganic filler such as silica or an organic filler such as resin particles in a resin that is cured by radiation, heat, or a combination on the substrate surface; and a sea-island structure on the substrate surface A method of forming a porous film by the above can be mentioned.

As another method for forming the antireflection layer, the surface reflection is suppressed by alternately laminating a material with a high refractive index and a material with a low refractive index, and forming a multilayer (multi-coating). Can be obtained. Usually, the antireflection layer is formed by a vapor phase method or the like in which a low refractive index material typified by SiO ₂ and a high refractive index material such as TiO ₂ or ZrO ₂ are alternately formed by vapor deposition.

In order to improve the antireflection effect, the refractive index of the low refractive index layer is preferably 1.45 or less. Examples of the material having these characteristics include LiF (refractive index n = 1.4), MgF ₂ (refractive index n = 1.4), 3NaF · AlF ₃ (refractive index n = 1.4), AlF ₃ ( Inorganic materials such as refractive index n = 1.4), Na ₃ AlF ₆ (refractive index n = 1.33), SiO ₂ (refractive index n = 1.45) are made into fine particles, and acrylic resin, epoxy resin, etc. Inorganic low-reflective materials, fluorine-based / silicone-based organic compounds, thermoplastic resins, thermosetting resins, radiation-curable resins, and the like can be used.

Furthermore, a material in which a sol obtained by dispersing ultrafine silica particles of 5 to 30 nm in water or an organic solvent and a fluorine-based film forming agent can be used. The sol in which the ultrafine silica particles of 5 to 30 nm are dispersed in water or an organic solvent can be obtained by a method of dealkalizing alkali metal ions in the alkali silicate salt by ion exchange or the like, or neutralizing the alkali silicate salt with a mineral acid. A known silica sol obtained by condensing active silicic acid known by the method, etc., a known silica sol obtained by condensing alkoxysilane with hydrolysis in the presence of a basic catalyst in an organic solvent, and the above-mentioned An organic solvent-based silica sol (organosilica sol) obtained by substituting water in the aqueous silica sol with an organic solvent by a distillation method or the like is used. These silica sols can be used in both aqueous and organic solvent systems. In producing the organic solvent-based silica sol, it is not necessary to completely replace water with an organic solvent. The silica sol contains solids 0.5 to 50 wt% concentration as SiO _2. Various structures such as a spherical shape, a needle shape, and a plate shape can be used for the structure of the ultrafine silica particles in the silica sol. As the film forming agent, alkoxysilane, metal alkoxide, hydrolyzate of metal salt, or fluorine-modified polysiloxane can be used.

  The low refractive index layer is obtained by diluting the above-described material into a solvent, for example, a wet coating method such as spin coating, roll coating or printing, or a vapor phase method such as vacuum deposition, sputtering, plasma CVD, or ion plating. After being provided on the high refractive index layer and dried, it can be obtained by curing with heat or radiation (in the case of ultraviolet rays, the above-mentioned photopolymerization initiator is used).

  The high refractive index layer is formed by using a binder resin having a high refractive index in order to increase the refractive index, adding ultrafine particles having a high refractive index to the binder resin, or using these in combination. To do. The refractive index of the high refractive index layer is preferably in the range of 1.55 to 2.70.

  As the resin used for the high refractive index layer, any resin can be used as long as it is transparent, and a thermosetting resin, a thermoplastic resin, a radiation (including ultraviolet) curable resin, or the like can be used. Thermosetting resins include phenolic resin, melamine resin, polyurethane resin, urea resin, diallyl phthalate resin, guanamine resin, unsaturated polyester resin, aminoalkyd resin, melamine-urea cocondensation resin, silicon resin, polysiloxane resin, etc. A curing agent such as a crosslinking agent and a polymerization initiator, a polymerization accelerator, a solvent, a viscosity modifier and the like can be added to these resins as necessary.

  As the ultrafine particles having a high refractive index, for example, ZnO (refractive index n = 1.9), TiO2 (refractive index n = 2.3 to 2.7), CeO2 which can also have an ultraviolet shielding effect can be obtained. Antimony-doped SnO2 (refractive index n = 1.95) or ITO (refractive) having fine particles (refractive index n = 1.95) and antistatic effect to prevent adhesion of dust Fine particles having a ratio n = 1.95). Other fine particles include Al2 O3 (refractive index n = 1.63), La2 O3 (refractive index n = 1.95), ZrO2 (refractive index n = 2.05), Y2 O3 (refractive index n). = 1.87) and the like. These fine particles are used alone or in combination, and those in the form of a colloid dispersed in an organic solvent or water are good in terms of dispersibility. The particle diameter is 1 to 100 nm, the transparency of the coating film To preferably 5 to 20 nm.

  In order to provide the high refractive index layer, the material described above is diluted with a solvent, for example, provided on a substrate by a method such as spin coating, roll coating, or printing, dried, and then subjected to heat or radiation (in the case of ultraviolet rays, the above-mentioned). The photopolymerization initiator may be used for curing.

  Further, the antireflection layer may contain one or more near infrared absorbing dyes and / or neon light absorbing dyes. In that case, the light transmittance in the near-infrared region is 20% or less, particularly 10% or less, and the light transmittance at 570 to 600 nm is preferably 30% or less, particularly 25% or less. Further, the resin must have a hydroxyl value and an acid value that are not more than predetermined values. As a result, it is possible to prevent the near-infrared absorbing dye and / or neon light-absorbing dye from reacting due to the hydroxyl group and acid value contained in the resin, and to stably absorb the near-infrared absorbing ability and / or neon light. An absorption function can be exhibited.

Preparation of Antireflection Film Realic 8200UV (trade name, manufactured by NOF Corporation, triacetyl cellulose film with a thickness of 80 μm / AR layer with a thickness of 5 μm / a protective film with a thickness of 40 μm) was prepared as an antireflection film. The antireflection film was arranged so as to be unwound as the upper sheet 4 in the step D shown in FIG.

Step A: Preparation of electromagnetic wave shielding film Copper foil (manufactured by Furukawa Circuit Foil, EXP-WS: trade name, thickness 9 μm) and polyethylene terephthalate film (Toyobo A4300, one side of which has been blackened by chromate treatment. 100 μm thick) with a urethane-based adhesive (Tg 20 ° C., average molecular weight 30,000, acid value 1, hydroxyl value 9) and dry lamination, and after applying a resist on the copper foil, exposure, By developing, etching, and removing the resist, a metal mesh of 300 μm □ and a line width of 10 μm, the size of one metal mesh layer is 550 mm × 960 mm, and the interval between individual metal mesh layers is 100 mm. An electromagnetic shielding film in which multiple metal mesh layers are formed on polyethylene phthalate film . At this time, when the plasma display panel is manufactured, the blackening treatment surface is set to be the viewing side (human side), and is therefore the non-bonding surface side. The electromagnetic wave shielding film thus obtained was arranged so as to be able to be unwound at the delivery position in step A shown in FIG.

Process B: Intermittent application of adhesive
The following components are mixed to prepare a pressure-sensitive adhesive, and the pressure-sensitive adhesive is intermittently coated using a slitting device on the metal mesh layer on the inner side of the four sides of the metal mesh, and the metal mesh grounding portion is placed. It was left and applied.
The following ingredients were mixed to prepare an adhesive.

Main agent: SK Dyne 1604N (trade name) manufactured by Soken Chemical Co., Ltd. 100 parts by mass Curing agent: L-45 agent (trade name) manufactured by Soken Chemical Co., Ltd. 1.5 parts by mass Solvent: A mixture of ethyl acetate and toluene in a ratio of 1: 1. 35 parts by mass

Step C: Drying Step 80 ° C. for 10 seconds, 100 ° C. for 10 seconds

Process D: Upper sheet lamination process The light release surface of Toyobo Co., Ltd. E-7002 (trade name, separator film having a thickness of 50 μm) was laminated. Lamination was performed between laminate rolls having a rubber hardness of 60 °.

Process E: Lamination | stacking of an adhesive layer The laminated adhesive layer uses Nitto Denko CS-9621. At that time, laminating was performed while separating the separator on one side. At that time, lamination was performed between laminate rolls having a rubber hardness of 70 °.

[Comparative example]
In the said Example, it replaced with the intermittent application of the adhesive, and prepared the antireflection film of the comparative example like all the examples except having applied the adhesive continuously using the die coat head.

[Evaluation]
In the above embodiment, since the adhesive is intermittently applied, there is a portion where the adhesive does not exist in a strip shape with the periphery of the metal mesh layer exposed between adjacent metal mesh layers. When the space between adjacent metal mesh layers is cut, only the periphery of the upper sheet is peeled off to expose the periphery of the metal mesh layer to which no adhesive is attached, and grounding can be taken out from the four sides. A possible film filter could be obtained. In contrast, in the comparative example, since the adhesive is continuously applied, the adhesive is continuously applied between the adjacent metal mesh layers. A film that cannot be removed was obtained.

  The long optical filter of the present invention can be transported in a long state, and can be applied in a long state when being attached to the display surface. It is also possible to apply in.

It is the schematic of the manufacturing process of the elongate optical filter of this invention. It is a figure which shows the laminated structure of the original fabric used for the process A in the manufacturing process of the long optical filter of this invention. It is a figure which shows the state which formed the adhesive layer on the electromagnetic wave shielding layer used at the process A in the manufacturing process of the long optical filter of this invention. It is a figure which shows the state which laminated | stacked the upper sheet | seat on the dried adhesive layer formed at the process C in the manufacturing process of the long optical filter of this invention. It is a figure which shows the state which laminated | stacked the adhesive layer for affixing on various displays directly on the transparent base material sheet side of the electromagnetic wave shielding layer of the lamination sheet formed at the process D in the manufacturing process of the long optical filter of this invention. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transparent base material sheet 2 Metal mesh layer 3 Adhesive layer 4 Upper side sheet 5 Adhesive layer

Claims (15)

It is a long optical functional filter having an electromagnetic wave shielding layer, an adhesive layer, and a long upper sheet. (1) The electromagnetic wave shielding layer has a certain distance from both ends in the width direction on the transparent substrate sheet. And a plurality of metal mesh layers of a quadrangular shape are stacked in a line in the longitudinal direction with a gap therebetween.
(2) The pressure-sensitive adhesive layer covers the metal mesh layer in a state where the pressure-sensitive adhesive is filled inside the metal mesh layer, but does not cover at least two sides of the metal mesh layer and is adjacent to the metal mesh layer. Between the matching metal mesh layers, a plurality of pressure-sensitive adhesive layers having a portion where the pressure-sensitive adhesive is not present in a band shape with the periphery of the metal mesh layer exposed are laminated,
(3) The upper sheet is equal to or wider than the width of the pressure-sensitive adhesive layer, and has a plurality of optical filters in which the upper sheet is laminated so as to continuously cover the plurality of pressure-sensitive adhesive layers. Long optical filter.   The long optical filter according to claim 1, wherein the upper sheet is a separator film.   The long optical filter according to claim 1, wherein the upper sheet is an antireflection film.   Between the pressure-sensitive adhesive layer and the upper sheet, or on the surface opposite to the metal mesh layer side of the transparent base sheet, near infrared absorption ability, ultraviolet absorption ability, impact resistance, neon light blocking ability, The long optical filter according to any one of claims 1 to 3, further comprising one or two or more functional layers selected from color adjusting ability.   The said adhesive layer has 1 type, or 2 or more types of functions chosen from near-infrared absorptivity, ultraviolet absorptivity, impact resistance, neon light interruption | blocking capability, and color-adjustability. The long optical filter according to claim 1.   The long optical filter according to claim 1, wherein the long optical filter is wound in a roll shape. An electromagnetic function filter of a single wafer having an electromagnetic wave shielding layer, an adhesive layer, and an upper sheet,
(1) The electromagnetic wave shielding layer is formed by laminating a rectangular metal mesh layer on a transparent substrate sheet at a certain distance from the ends of the four sides.
(2) The pressure-sensitive adhesive layer is formed so as to cover the metal mesh layer with the pressure-sensitive adhesive filled in the metal mesh layer, but not to cover at least three sides of the metal mesh layer. Is,
(3) The periphery of the upper sheet is equal to or larger than the periphery of the pressure-sensitive adhesive layer, and at least two edges of the periphery of the upper sheet are larger than the width of the pressure-sensitive adhesive layer. A single-wafer optical filter, wherein the optical filter is laminated.   The single-wafer optical filter according to claim 7, wherein the long optical filter according to any one of claims 1 to 6 is cut for each optical filter. (1) Electromagnetic wave shielding by laminating a plurality of rectangular metal mesh layers on a long transparent substrate sheet at a certain distance from both ends in the width direction and spaced in the long direction. Forming a layer,
(2) The adhesive is intermittently applied on the electromagnetic wave shielding layer to cover the electromagnetic wave shielding layer so that the metal mesh layer of the electromagnetic wave shielding layer is filled, and at least two sides of the periphery of the metal mesh layer are A plurality of pressure-sensitive adhesive layers that do not cover and have a portion where the pressure-sensitive adhesive does not exist in a strip shape with the periphery of the metal mesh layer exposed between adjacent metal mesh layers,
(3) A length having a plurality of optical filters by continuously covering a plurality of pressure-sensitive adhesive layers using a long upper sheet that is equal to or wider than the width of the pressure-sensitive adhesive layer. A method for producing a shaku optical filter.   The method for producing a long optical filter according to claim 9, wherein the upper sheet is a separator film.   The method for producing a long optical filter according to claim 9, wherein the upper sheet is an antireflection film.   Between the pressure-sensitive adhesive layer and the upper sheet, or on the surface opposite to the metal mesh layer side of the transparent base sheet, near infrared absorption ability, ultraviolet absorption ability, impact resistance, neon light blocking ability, The method for producing a long optical filter according to any one of claims 9 to 11, comprising one or two or more functional layers having one or two or more functions selected from color adjusting ability. .   The said adhesive layer has 1 type, or 2 or more types of functions chosen from near-infrared absorptivity, ultraviolet absorptivity, impact resistance, neon light blocking ability, and color-adjustability. The manufacturing method of the elongate optical filter of any one of these.   The method for producing a long optical filter according to claim 9, wherein the method is wound in a roll shape. A method for producing an optical filter, comprising: cutting a long optical filter obtained by the method for producing a long optical filter according to claim 9 to obtain a single-wafer optical filter.