JP2008256852A - Optical film body and manufacturing method of optical film body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical film body which is constituted so that an axis direction of an optical axis can be easily confirmed and marking may not become obstructive in defect inspection and to provide a manufacturing method of the optical film body. <P>SOLUTION: The optical film body is constituted by laminating a surface protection film for protecting a surface of an optical film layer on the optical film layer having the optical axis. When optical axis information about the optical axis is formed on the surface protection film by printing, printing density at a peripheral part of a printed formation which is the printed optical axis information is made to be smaller than printing density at the inside of the printed formation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an optical film body obtained by laminating a surface protective film for protecting the surface of the optical film layer on an optical film layer having an optical axis, and a method for producing the optical film body.

  Conventionally, an optical film body in which a surface protective film for protecting the surface of the optical film layer is laminated on an optical film layer having an optical axis is known. Examples of the optical film layer include a polarizing plate, a retardation plate, a laminate of a polarizing plate and a retardation plate used in a liquid crystal display device. The surface protective film is provided to protect the surface of the optical film layer, and is bonded to the surface of the optical film layer with an adhesive or the like so that it can be peeled off when incorporated in a liquid crystal display device or the like. Yes.

  Moreover, the film layer called a separator may be bonded together by the optical film layer surface on the opposite side to this surface protection film. Similar to the surface protective film, this separator also aims to protect the surface of the optical film layer, and also protects the adhesive layer for fixing to the liquid crystal display device. This adhesive layer is held on the surface of the optical film layer even after the separator is peeled off.

  This optical film has an optical axis. As this optical axis, for example, a single optical axis is formed in parallel with the extending direction of the optical film. If the axis direction of this optical axis is wrongly installed in a liquid crystal display device, the function as a liquid crystal display device will not be exhibited. Therefore, the axial direction of the optical axis is applied to the surface protective film surface of the optical film layer by a stamp or the like. By marking, it is devised so that this axial direction can be easily discriminated. However, since marking with a stamp or the like is performed manually, work efficiency is extremely poor. In particular, when the surface protective film is provided with a release treatment layer such as a silicone layer, the work efficiency is further deteriorated because the release treatment layer needs to be wiped off with alcohol or the like. Moreover, since the stamp ink dries slowly, it is necessary to place a slip sheet after stamping, which is disadvantageous economically.

  Further, Patent Document 1 is known as a method for forming a mark indicating the optical axis direction on a surface protective film in order to easily determine the axial direction of the optical axis. According to Patent Document 1, a method is described in which the axial direction of an optical axis is printed on a surface protective film by an ink jet machine instead of a stamp pressing operation by a human hand.

  Further, an optical film for liquid crystal is known in which an identification mark (mark for identifying an optical axis or the like) made of UV paint is disposed on a surface protective film (Patent Document 2). In Patent Document 2, UV paint is used so that the identification mark does not interfere with the inspection at the time of quality inspection of the polarizing film under visible light or at the time of quality inspection of the liquid crystal display element in which the polarizing film is arranged in the liquid crystal cell. An identification mark is formed. And when discriminating the axial direction of the optical axis, it is described that the black mark is irradiated and the UV paint is emitted to surely recognize the identification mark.

JP 2003-14934 A Japanese Patent Laid-Open No. 10-221685

  However, in Patent Document 1, a polarizing plate with a protective film having a predetermined size that has been transported from upstream is detected by a sensor, and based on the detection result, the transportation of the polarizing plate with a protective film is stopped in the next step. The marking is performed on the surface of the protective film by an inkjet machine, and the marking location is limited to the inkjet printing range. In order to easily determine the axial direction of the optical axis, when a plurality of marking portions are provided, it is not preferable from the viewpoint of a long printing operation time and production efficiency. On the other hand, when a plurality of inkjet machines are provided, it is not preferable from the viewpoint of the equipment cost and installation area.

  Moreover, it is intended for a polarizing plate with a protective film that has been cut into a predetermined size, and is marked on a long original fabric (for example, a roll raw material of several tens of meters or more) of a polarizing plate with a protective film. The case is not assumed. When marking the axial direction of the optical axis in the form of a raw roll, it is not preferable to adopt the configuration of Patent Document 1 as it is from the viewpoint of production efficiency and manufacturing cost.

  In the case of Patent Document 2, UV paint is used for marking. However, when printed on a surface protective film, when the triangular marking portion is dried as shown in FIG. Or, it is opaque (slashed in FIG. 5) and can be easily visually recognized like ground glass, and it does not interfere with inspection of large size defects (for example, scratches, bubbles, foreign matter, etc.). In the demand for high quality, for example, defects in the range of 80 μm to 150 μm must be inspected, and whitening of UV paint also interferes with the defect inspection, and improvement is strongly desired. . In addition, even if a transparent UV paint is used as the UV paint, when printed on the surface protective film, the marking portion is white and easily visible, and the defects that overlap with the marking portion in the vertical direction are reliably inspected. I can't.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to easily confirm the axial direction of the optical axis, and to provide an optical film body configured so that marking is not an obstacle in defect inspection, and its It is providing the manufacturing method of an optical film body.

As a result of intensive studies to solve the above problems, the following invention has been completed. That is, the optical film body of the present invention is an optical film body formed by laminating a surface protective film for protecting the surface of the optical film layer on an optical film layer having an optical axis,
When optical axis information related to the optical axis is formed on the surface protective film by printing, the print density of the printed product that is the printed optical axis information is determined from the print density inside the print product. It is also characterized in that it is formed to be small.

  The operational effects of this configuration are as follows. That is, the optical film body includes at least an optical film layer having an optical axis and a surface protective film for protecting the surface of the optical film layer, and the optical axis is interposed between the optical film layer and the surface protective film. The optical axis information on the image is formed by printing (printed product). The optical axis information is printed (concept including printing) on the surface protective film side. This is because the surface protective film is peeled off from the optical film layer when mounted on, for example, a liquid crystal display device, and the optical axis information cannot remain as a display device if the optical axis information remains in the optical film layer. Because of the reason. And since the optical axis information printed on the surface protective film is interposed between the surface protective film and the optical film layer via the adhesive, the optical axis information formed is surrounded by the adhesive layer. It will be surrounded and can be visually recognized to the extent that it does not interfere with the defect inspection when visually observed.

  In particular, by forming the peripheral edge thickness of the printed product to be smaller than the internal thickness of the printed product, the interface between the pressure-sensitive adhesive layer and the printed product becomes inconspicuous, It is configured not to get in the way of visual inspection. As a result, even if the optical axis information is formed using, for example, transparent paint, fluorescent paint, UV paint, etc., the optical axis information can be confirmed, and the defect inspection can be performed with high accuracy without the optical axis information being in the way. It can be done.

  Moreover, the optical film body may be cut into a predetermined size, or may be configured as a long original fabric. The optical film has an optical axis, and may be a polarizing plate, a retardation plate, or a composite thereof. The polarizing plate may be provided with a polarizing plate protective layer (film) for protecting the polarizing plate. The “defect” is a defect that is not preferable as a product, and examples thereof include foreign matter, dirt, scratches, nicks, bubbles, etc. on the surface or inside of the optical film layer.

  Moreover, as a preferable embodiment of the present invention, it is preferable that the print thickness of the printed product is formed so as to gradually decrease from the inside toward the peripheral edge. For example, the central cross-sectional shape of the printed product may be a mountain shape, a trapezoidal shape, or a triangular shape. In addition, when the printed product is formed such that the printing thickness of the printed product is gradually reduced from the inside toward the peripheral edge, the gradual decrease is exemplified as a straight line or a curve.

  With these configurations, the interface between the pressure-sensitive adhesive layer and the printed product is not conspicuous, but is configured so as not to interfere with the appearance inspection.

  Further, as a preferred embodiment of the present invention, when forming the print density in the peripheral part of the printed product to be smaller than the density inside the print of the print product, the pixel density in the peripheral part of the printed product is Further, the present invention is characterized in that it is configured to be smaller than the pixel density inside the printed product.

  According to this configuration, the pixel density in the peripheral portion of the printed material can be made smaller than the pixel density inside the printed material, for example, the interface between the printed material and the adhesive layer can be made inconspicuous, and the appearance Not in the way of inspection.

  Further, as a preferred embodiment of the present invention, in the case of forming the print density at the periphery of the printed product so as to be smaller than the print density inside the print product, the pixel size at the periphery of the print product is set. Further, the present invention is characterized in that it is configured to be smaller than the pixel size inside the printed product.

  According to this configuration, the pixel size at the periphery of the printed material can be made smaller than the pixel size inside the printed material, for example, the interface between the printed material and the adhesive layer can be made inconspicuous, and the appearance Not in the way of inspection.

  In a preferred embodiment of the present invention, the optical axis information is preferably formed by printing on a surface protective film with a phosphor-containing paint. As a result, the optical axis information can be easily confirmed using ultraviolet light (black light). The phosphor is a substance that emits light when irradiated with ultraviolet rays, and is not particularly limited, and may be an inorganic substance or an organic substance. The phosphor-containing paint is preferably a transparent color. As the fluorescent paint resin, for example, polymetal acrylate, vinyl resin, alkyd resin and the like can be used.

Another method for producing an optical film body of the present invention is a method for producing an optical film body comprising a surface protective film for protecting the surface of the optical film layer on an optical film layer having an optical axis. ,
A printing step for printing optical axis information on the optical axis on the surface protective film;
A bonding step in which the optical axis information is interposed between the surface protective film and the optical film layer when the surface protective film on which the optical axis information is printed in the printing step and the optical film layer are bonded. And having at least
The printing step is characterized in that the printing density in the periphery of the printed product, which is the printed optical axis information, is formed to be smaller than the printing density inside the printed product.

  The operational effects of this configuration are as follows. That is, in the manufacturing method according to the present invention, a printing process for printing optical axis information about the optical axis on the surface protective film, and a surface protective film on which the optical axis information is printed in the printing process and the optical film layer are bonded. And at least a bonding step in which the optical axis information is interposed between the surface protective film and the optical film layer. Thus, conventionally, after the optical film body was manufactured, the optical axis information was formed on the surface protective film using a stamp, an ink jet machine, etc., so the work efficiency was very poor. By printing information on the surface protective film in advance, work efficiency can be greatly improved. Further, since the optical axis information is preliminarily printed on the surface protective film, it is particularly effective when a long optical film body is manufactured. Further, by adopting a continuous printing method (for example, a method of continuous printing using a rotating roll-shaped plate) as a printing method, the printing speed is high and the manufacturing cost can be suppressed. In addition, it is possible to eliminate human error due to stamp work. Further, in particular, as a printing method, an optical device manufactured by this manufacturing method is configured such that the printing density in the peripheral portion of the printed product is formed to be smaller than the printing density inside the printed product. The film body has the same effects as the optical film body described above.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 shows an example of an optical film body. FIG. 2 shows an example embodiment of optical axis information. FIG. 3 is a diagram for explaining the cross-sectional shape of the printed product of optical axis information.

<Optical film body>
An optical film layer is comprised with the polarizing plate which has an optical axis, a phase difference plate, and those laminated bodies, for example. The optical film body shown in FIG. 1 has a polarizing plate comprising a polarizer and a polarizer protective layer formed on both surfaces thereof, a surface protective film provided on one surface of the polarizing plate, and the other polarizing plate. It is comprised with the separator provided in the surface.

  The surface protective film has a light-peelable pressure-sensitive adhesive layer that is releasably attached to the surface of a polarizing plate on one side of a base film composed of a plastic film.

  Although the base film of the surface protective film is not particularly limited, for example, a biaxially stretched film such as polypropylene or polyester can be preferably used. Although it does not restrict | limit especially about the thickness of a base film, It is about 10-200 micrometers suitably.

  The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer interposed between the surface protective film and the polarizer protective layer is not particularly limited. For example, any of acrylic, synthetic rubber and rubber-based pressure-sensitive adhesives Can be used. Among these, an acrylic pressure-sensitive adhesive whose adhesive force can be easily controlled by the composition is desirable. As the pressure-sensitive adhesive, a crosslinking agent, a tackifier, a plasticizer, a filler, an antioxidant, an ultraviolet absorber, a silane coupling agent, and the like can be appropriately used as necessary. The pressure-sensitive adhesive layer can be formed on the surface protective film or polarizing plate by a transfer method, a direct copy method, a coextrusion method, or the like. Although the thickness (dry film thickness) of an adhesive layer is not restrict | limited in particular, Usually, it is about 5-50 micrometers.

  In addition, as an adhesive constituting an adhesive layer interposed between the polarizer and the polarizer protective layer, for example, an adhesive made of vinyl alcohol polymer, or boric acid or borax, glutaraldehyde or melamine, An adhesive comprising at least a water-soluble crosslinking agent of a vinyl alcohol polymer such as oxalic acid can be used. The adhesive layer of such an adhesive is formed as a coating / drying layer or the like of an aqueous solution, and other additives and catalysts such as acids can be blended as necessary when preparing the aqueous solution.

  The structure of a general polarizing plate is as shown in FIG. 1, and a polarizer protective layer is provided on both sides of the polarizer. On one surface of the polarizer protective layer, an adhesive layer for attaching a polarizing plate to a glass substrate constituting the liquid crystal display device can be provided, and further, a separator for protecting the adhesive layer is provided.

  The polarizer is not particularly limited, and various types can be used. Examples of the polarizer include dichroic substances such as iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films. Examples thereof include a polyene-based oriented film such as a stretched product obtained by adsorbing a substance, a dehydrated polyvinyl alcohol product or a dehydrochlorinated polyvinyl chloride product. Although the thickness of the polarizer is not particularly limited, it is generally about 5 to 80 μm, but is not limited thereto, and the method for adjusting the thickness of the polarizer is not particularly limited. Usual methods such as tenter, roll stretching and rolling can be used.

  Among these, those obtained by stretching a polyvinyl alcohol film and adsorbing and orienting a dichroic material (iodine, dye) are preferably used. Each treatment of dyeing, crosslinking and stretching of the polyvinyl alcohol film need not be performed separately and may be performed simultaneously, and the order of the treatments may be arbitrary. In addition, you may use the polyvinyl alcohol-type film which gave the swelling process as a polyvinyl-alcohol-type film. Generally, a polyvinyl alcohol film is immersed in a solution containing iodine or a dichroic dye, dyed by adsorbing iodine or a dichroic dye, washed, and stretched in a solution containing boric acid or borax. After uniaxial stretching at a magnification of 3 to 7 times, it is dried. After stretching in a solution containing iodine or dichroic dye, further stretching (two-stage stretching) in a solution containing boric acid or borax, etc., and then drying, the orientation of iodine increases, and the degree of polarization This is particularly preferable because the characteristics are improved.

  Examples of the polyvinyl alcohol polymer include those obtained by polymerizing vinyl acetate and then saponifying vinyl acetate and a small amount of a copolymerizable monomer such as unsaturated carboxylic acid, unsaturated sulfonic acid, and cationic monomer. Polymerized products and the like can be mentioned. The average degree of polymerization of the polyvinyl alcohol polymer is not particularly limited, and any one can be used, but 1000 or more is preferable, and 2000-5000 is more preferable. Moreover, 85 mol% or more is preferable and, as for the saponification degree of a polyvinyl alcohol-type polymer, More preferably, it is 98-100 mol%.

  An appropriate transparent film can be used for the polarizer protective layer provided on one side or both sides of the polarizer. Among them, a film made of a polymer excellent in transparency, mechanical strength, thermal stability, moisture shielding property, etc. is preferably used. Examples of the polymer include acetate resins such as triacetyl cellulose, polycarbonate resins, polyarylate, polyester resins such as polyethylene terephthalate, polyimide resins, polysulfone resins, polyethersulfone resins, polystyrene resins, polyethylene, polypropylene. And other polyolefin resins, polyvinyl alcohol resins, polyvinyl chloride resins, polynorbornene resins, polymethyl methacrylate resins, liquid crystal polymers, and the like. The film may be produced by any of the casting method, calendar method, and extrusion method.

  Moreover, the polymer film described in JP-A-2001-343529 (WO01 / 37007), for example, (A) a thermoplastic resin having a substituted and / or unsubstituted imide group in the side chain, and (B) a substitution in the side chain And / or a resin composition containing an unsubstituted phenyl and a thermoplastic resin having a nitrile group. A specific example is a film of a resin composition containing an alternating copolymer composed of isobutylene and N-methylmaleimide and an acrylonitrile / styrene copolymer. As the film, a film made of a mixed extruded product of the resin composition or the like can be used. Since these films have a small phase difference and a small photoelastic coefficient, problems such as unevenness due to the distortion of the polarizing plate can be eliminated, and since the moisture permeability is small, the humidification durability is excellent.

  Moreover, it is preferable that a polarizer protective layer has as little color as possible. Therefore, Rth = [(nx + ny) / 2−nz] · d (where nx and ny are the main refractive index in the plane of the film, nz is the refractive index in the film thickness direction, and d is the film thickness). A protective film having a retardation value in the film thickness direction of −90 nm to +75 nm is preferably used. By using a film having a thickness direction retardation value (Rth) of −90 nm to +75 nm, the coloring (optical coloring) of the polarizing plate caused by the protective film can be almost eliminated. The thickness direction retardation value (Rth) is more preferably −80 nm to +60 nm, and particularly preferably −70 nm to +45 nm.

  From the viewpoints of polarization characteristics and durability, an acetate resin such as triacetyl cellulose is preferable, and a triacetyl cellulose film whose surface is saponified with an alkali or the like is particularly preferable.

  Although the thickness of the polarizer protective layer is arbitrary, it is generally 500 μm or less, preferably 1 to 300 μm, particularly preferably 5 to 200 μm for the purpose of reducing the thickness of the polarizing plate. In addition, when providing the polarizer protective layer of a transparent film on both sides of a polarizing film, it can also be set as the transparent film which consists of a polymer etc. which are different in the front and back.

  As long as the object of the present invention is not impaired, the polarizer protective layer may be subjected to a treatment for the purpose of hard coat treatment, antireflection treatment, prevention of sticking, diffusion or antiglare, and the like. The hard coat treatment is performed for the purpose of preventing scratches on the surface of the polarizing plate. For example, a hard coating with an appropriate UV curable resin such as a silicone type is applied to the surface of the transparent protective film. It can be formed by a method to be added to.

  On the other hand, the antireflection treatment is performed for the purpose of preventing reflection of external light on the surface of the polarizing plate, and can be achieved by forming an antireflection film or the like according to the prior art. Anti-sticking is used for the purpose of preventing adhesion to the adjacent layer, and anti-glare treatment is performed for the purpose of preventing external light from being reflected on the surface of the polarizing plate and obstructing the visibility of the light transmitted through the polarizing plate. For example, it can be formed by imparting a fine concavo-convex structure to the surface of the transparent protective film by an appropriate method such as a roughening method by a sandblasting method or an embossing method, or a blending method of transparent fine particles.

  Examples of the transparent fine particles include silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, and antimony oxide having an average particle diameter of 0.5 to 20 μm. Alternatively, organic fine particles composed of crosslinked or uncrosslinked polymer particles and the like can be used. The amount of the transparent fine particles used is generally 2 to 70 parts by mass, particularly 5 to 50 parts by mass per 100 parts by mass of the transparent resin.

  Furthermore, the antiglare layer containing transparent fine particles can be provided as the transparent protective layer itself or as a coating layer on the surface of the transparent protective layer. The antiglare layer may also serve as a diffusion layer (viewing angle compensation function or the like) for diffusing the light transmitted through the polarizing plate to expand the viewing angle. The antireflection layer, the antisticking layer, the diffusion layer, the antiglare layer, and the like described above can be provided separately from the transparent protective layer as an optical layer composed of a sheet provided with these layers.

  For the formation of the pressure-sensitive adhesive layer interposed between the separator and the polarizer protective layer, various acrylic, synthetic rubber and rubber-based pressure-sensitive adhesives can be used. Examples of the constituent material of the separator include paper, synthetic resin films such as polyethylene, polypropylene, and polyethylene terephthalate. The surface of the separator may be subjected to a release treatment such as silicone treatment, long-chain alkyl treatment, or fluorine treatment as necessary in order to enhance the peelability from the pressure-sensitive adhesive layer.

<Optical axis information>
The optical axis information of the present invention is information regarding the optical axis of the optical film and is not particularly limited as long as the directionality of the optical axis can be determined. As illustrated in FIG. It may be an axial direction), an arrow (the direction of the arrow means the optical axis direction), other figures, pictures, characters, and the like. In FIG. 2, triangles and arrows are indicated by dotted lines for explanation, but in reality, they are not visible as dotted lines, and to the extent that they do not interfere with high-precision defect inspection (for example, defect detection inspection of 80 μm to 150 μm), The optical axis information is visually recognized from the outside.

  Further, the optical axis information may be formed at a predetermined position over the entire optical film body, or may be formed at random, and the formation position can be set as appropriate by the manufacturer or the user. In the case of a long optical film body, since it is finally cut into a predetermined size for commercialization, the optical axis information is converted into the optical film so that the optical axis information is formed at any of the cut portions. It is preferably formed over the entire body.

  The optical axis information is formed so as to be interposed between the surface protective film and the polarizer protective layer (or polarizing plate). And an adhesive layer is formed in the surface protection film in which optical axis information was formed. In particular, as shown in FIG. 3, the cross-sectional thickness of the printed product of the printed optical axis information is smaller (thinner) than the internal thickness at the peripheral edge. Accordingly, when the pressure-sensitive adhesive layer surrounds the printed product of the optical axis information, the difference in height of the interface (boundary) of the printed product becomes inconspicuous. Furthermore, since the entire printed product becomes transparent, the optical axis information can be visually recognized from the outside to the extent that it does not hinder high-precision defect inspection (for example, defect detection inspection of 80 μm to 150 μm).

  In FIG. 3, the cross-sectional shape of the printed product is exemplified by the xx cross-section and the yy cross-section, but the cross-sectional shape is not particularly limited, and the thickness of the peripheral edge of the print-formed product is It is important that the thickness is smaller than the internal thickness, and more preferably, the print thickness of the printed product is formed so as to gradually decrease from the inside toward the peripheral edge. More preferably, when the printed product is formed such that the printing thickness of the printed product gradually decreases from the inside toward the peripheral edge, the gradual decrease is a straight line or a curve. FIG. 3 shows a cross-sectional shape along the vertical and horizontal central lines of the printed product, but the cross-sectional shape of other portions is also formed so that the print thickness gradually decreases from the inside toward the peripheral edge. Has been.

  FIG. 4 shows another example of a method for forming optical axis information. The printed product of optical axis information shown in FIG. 4 is formed as a set of pixels (dots). FIG. 4A shows a triangular printed product, in which the peripheral pixel (dot) density is lower than that inside. Such formation may be referred to as gradation formation or gradation printing. FIG. 4B shows a triangular printed product, in which the pixel (dot) size at the periphery is smaller than that inside. On the other hand, FIG. 4C shows a triangle-shaped printed product in the case where the pixel density is the same in the peripheral portion and inside.

  The optical axis information is preferably formed on the surface protective film using a transparent paint or a phosphor-containing paint, and a phosphor-containing paint is particularly desirable. This is because when the phosphor-containing paint is used, the optical axis information can be easily and reliably visually recognized by irradiating the black light. The transparent paint or the phosphor-containing paint is not particularly limited, and a known one can be used, but it is preferable to select a more suitable one from the viewpoint of durability against the pressure-sensitive adhesive.

  The method for forming the optical axis information on the surface protective film is not particularly limited, and examples thereof include a stamp method, an ink jet method, a transfer method, a spray method, and a printing method. Examples of the printing method include a relief printing method, a gravure printing method, and a screen printing method, and a relief printing method or a gravure printing method that enables continuous printing is particularly preferable. Further, the relief printing method or gravure printing method, which facilitates the above gradation formation, pixel size variation formation, and pixel density variation formation, is particularly preferable.

  Further, the printing thickness of the printed product of the optical axis information is preferably formed thinner than the thickness of the pressure-sensitive adhesive layer. For example, the thickness is preferably in the range of 0.1% to 10% of the thickness of the pressure-sensitive adhesive layer. . For example, when the average thickness of the pressure-sensitive adhesive layer is set to 6 μm, for example, the average thickness of the printed product of the optical axis information is set in the range of 0.006 μm to 0.6 μm. By setting the thickness of the optical axis information printed product in the range of 0.1% to 10% of the thickness of the pressure-sensitive adhesive layer, it is possible to reliably surround the optical axis information printed product with the adhesive. In particular, the thickness of the printed product is formed so that the peripheral edge thereof is thinner than the inside thereof, so that the interface between the printed product and the pressure-sensitive adhesive layer is not conspicuous. The boundary with the layer is not conspicuous and does not obstruct the appearance inspection.

<Manufacturing method>
An example of the manufacturing method of the elongate optical film body of this invention is demonstrated. First, (A) a step of obtaining a polarizer. Here, a polarizer is obtained by drying a polyvinyl alcohol (PVA) film subjected to dyeing / crosslinking and stretching treatment. The stretching direction in the stretching process here coincides with the optical axis direction. (B) The process of manufacturing a polarizing plate. Here, a polarizing plate is manufactured by laminating a triacetyl cellulose (TAC) film on both sides of a polarizer via an adhesive and laminating a polarizer protective layer. Here, in the drawing, the anti-glare treatment is applied in advance to the TAC film laminated thereon.

  (C) A surface protective film is produced on a production line (may be a different production location) different from the step of producing the polarizing plate. The original surface protective film is fed out and conveyed, and optical axis information is continuously formed on one surface with a phosphor-containing paint or a transparent paint by, for example, letterpress printing.

  Here, it is important to form so that the printing density of the peripheral part of the printed product, which is the printed optical axis information, is smaller than the printing density inside the printed product. For example, the optical axis information is printed on the surface protective film so as to have a cross-sectional shape as shown in FIG. 3 and a pixel density configuration as shown in FIGS.

  Next, the release film (or paper) on which the weak pressure-sensitive adhesive layer is formed and the surface protective film are bonded together. At this time, the optical axis information and the weak pressure-sensitive adhesive layer are bonded to each other between the release film and the surface protective film and wound into a roll.

  (D) The process of bonding a surface protective film together. A surface protective film is bonded to one surface (upper side in FIG. 1) of the polarizing plate via a weak adhesive. In addition, optical axis information is printed and formed on the surface protective film, and further, a weak adhesive is applied. While peeling the release film from the surface protective film, it is bonded to the polarizing plate. The weak adhesive applied to the surface protective film and the optical axis information (printed product) printed on the surface protective film remain formed on the surface protective film even after the surface protective film is peeled off. Is not substantially transferred.

  (E) A step of attaching a separator. A separator is bonded to one surface (lower side in FIG. 1) of the polarizing plate via a strong adhesive. Here, a strong adhesive is applied to the separator in advance. The strong adhesive applied to the separator is transferred to the TAC after peeling off the separator. Steps (D) and (E) may be performed simultaneously, and step (E) may be performed before step (D).

  Through the above steps, a long optical film body is manufactured. After the laminating step (D, E), an optical film body of a predetermined size may be obtained by cutting to a predetermined size. After the long optical film body is wound up in a roll shape, it is predetermined in another step. You may comprise so that it may cut | disconnect in size.

According to the above manufacturing method, a long optical film body can be efficiently manufactured, and remarkable effects such as a significant improvement in work efficiency, a reduction in manufacturing equipment cost, and a reduction in human error compared to the conventional manufacturing method. Is played.
<Another embodiment>

  The optical film body according to the present invention is, for example, a hard coat treatment or an antireflection treatment on the surface of the transparent protective film (polarizer protective film) that does not adhere the polarizer (the surface on which the adhesive coating layer is not provided), Examples thereof include a method of applying a surface treatment for the purpose of preventing sticking, diffusion or antiglare, and laminating an alignment liquid crystal layer for the purpose of viewing angle compensation or the like. Further, an optical film used for forming a liquid crystal display device such as a reflection plate, a semi-transmission plate, a phase difference plate (including a wave plate (λ plate) such as 1/2 or 1/4), a viewing angle compensation film, etc. A layer or a laminate of two or more layers is also included. In particular, if the optical film layer is a polarizing plate, a reflective polarizing plate or a semi-transmissive polarizing plate in which a reflecting plate or a semi-transmissive reflecting plate is laminated, an elliptical polarizing plate or a circular polarizing plate in which a retardation plate is laminated, It is preferably applied as a wide viewing angle polarizing plate in which a viewing angle compensation layer or a viewing angle compensation film is laminated, or a polarizing plate in which a brightness enhancement film is laminated.

  A reflective polarizing plate is a polarizing plate provided with a reflective layer, and is used to form a liquid crystal display device or the like that reflects incident light from the viewing side (display side). Such a light source can be omitted, and the liquid crystal display device can be easily thinned. The reflective polarizing plate can be formed by an appropriate method such as a method in which a reflective layer made of metal or the like is attached to one surface of the polarizing plate via a transparent protective layer or the like as necessary.

  Specific examples of the reflective polarizing plate include those in which a reflective layer is formed by attaching a foil or a vapor deposition film made of a reflective metal such as aluminum on one side of a transparent protective film matted as necessary. Moreover, the transparent protective film contains fine particles so as to have a surface fine concavo-convex structure and a reflective layer having a fine concavo-convex structure thereon. The reflective layer having the fine concavo-convex structure has an advantage that incident light is diffused by irregular reflection to prevent directivity and glaring appearance and to suppress unevenness in brightness and darkness. The transparent protective film containing fine particles also has an advantage that incident light and its reflected light are diffused when passing through it, and light and dark unevenness can be further suppressed. The reflective layer of the fine concavo-convex structure reflecting the surface fine concavo-convex structure of the transparent protective film is formed by transparent the metal by an appropriate method such as a vapor deposition method such as a vacuum vapor deposition method, an ion plating method, a sputtering method, or a plating method. It can be performed by a method of attaching directly to the surface of the protective layer.

  Instead of the method of directly applying the reflecting plate to the transparent film (polarizer protective layer) of the polarizing plate, it can also be used as a reflecting sheet having a reflecting layer provided on an appropriate film according to the transparent film. Since the reflective layer is usually made of metal, the usage form in which the reflective surface is covered with a transparent film, a polarizing plate or the like is used to prevent a decrease in reflectance due to oxidation, and in terms of long-term maintenance of the initial reflectance. More preferable is the point of avoiding the additional attachment of the protective layer.

  The semi-transmissive polarizing plate can be obtained by using a semi-transmissive reflective layer such as a half mirror that reflects and transmits light with the reflective layer. A transflective polarizing plate is usually provided on the back side of a liquid crystal cell, and displays an image by reflecting incident light from the viewing side (display side) when a liquid crystal display device is used in a relatively bright atmosphere. In a relatively dark atmosphere, a liquid crystal display device or the like that displays an image using a built-in light source such as a backlight built in the back side of the transflective polarizing plate can be formed. In other words, the transflective polarizing plate is useful for forming a liquid crystal display device of a type that can save energy of using a light source such as a backlight in a bright atmosphere and can be used with a built-in light source even in a relatively dark atmosphere. It is.

  An elliptically polarizing plate or a circularly polarizing plate in which a retardation plate is further laminated on a polarizing plate will be described. A phase difference plate or the like is used when changing linearly polarized light to elliptically polarized light or circularly polarized light, changing elliptically polarized light or circularly polarized light to linearly polarized light, or changing the polarization direction of linearly polarized light. In particular, a so-called quarter-wave plate (also referred to as a λ / 4 plate) is used as a retardation plate that changes linearly polarized light into circularly polarized light or changes circularly polarized light into linearly polarized light. A half-wave plate (also referred to as a λ / 2 plate) is usually used when changing the polarization direction of linearly polarized light.

  The elliptically polarizing plate is effectively used for black and white display without the above color by compensating (preventing) the coloration (blue or yellow) generated by the birefringence of the liquid crystal layer of the super twist nematic (STN) type liquid crystal display device. It is done. Further, the one in which the three-dimensional refractive index is controlled is preferable because it can compensate (prevent) coloring that occurs when the screen of the liquid crystal display device is viewed from an oblique direction. The circularly polarizing plate is effectively used, for example, when adjusting the color tone of an image of a reflective liquid crystal display device in which an image is displayed in color, and also has an antireflection function.

  Another example of the optical film layer is a retardation plate. Examples of the retardation plate include a refracting film formed by uniaxially or biaxially stretching a polymer material, a liquid crystal polymer alignment film, and a liquid crystal polymer alignment layer supported by a film. The stretching treatment can be performed by, for example, a roll stretching method, a long gap stretching method, a tenter stretching method, a tubular stretching method, or the like. In the case of uniaxial stretching, the stretching ratio is generally about 1.1 to 3 times. The thickness of the retardation plate is not particularly limited, but is generally 10 to 200 μm, preferably 20 to 100 μm.

  Examples of the polymer material include polyvinyl alcohol, polyvinyl butyral, polymethyl vinyl ether, polyhydroxyethyl acrylate, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, polycarbonate, polyarylate, polysulfone, polyethylene terephthalate, polyethylene naphthalate, and polyethersulfone. , Polyphenylene sulfide, polyphenylene oxide, polyallylsulfone, polyvinyl alcohol, polyamide, polyimide, polyolefin, polyvinyl chloride, cellulosic polymers, or binary, ternary various copolymers, graft copolymers, Examples include blends. These polymer materials become oriented products (stretched films) by stretching or the like.

  Examples of the liquid crystal polymer include various main chain types and side chain types in which a conjugated linear atomic group (mesogen) imparting liquid crystal alignment is introduced into the main chain or side chain of the polymer. It is done. Specific examples of the main chain type liquid crystalline polymer include, for example, a nematic alignment polyester liquid crystalline polymer, a discotic polymer, and a cholesteric polymer having a structure in which a mesogen group is bonded to a spacer portion that imparts flexibility. . Specific examples of the side chain type liquid crystalline polymer include polysiloxane, polyacrylate, polymethacrylate, or polymalonate as a main chain skeleton, and a nematic alignment imparting paraffin through a spacer portion composed of a conjugated atomic group as a side chain. Examples thereof include those having a mesogen moiety composed of a substituted cyclic compound unit. These liquid crystalline polymers are prepared by, for example, applying a solution of a liquid crystalline polymer on an alignment-treated surface such as a surface of a thin film such as polyimide or polyvinyl alcohol formed on a glass plate, or an oblique deposition of silicon oxide. This is done by developing and heat treatment.

  The retardation plate may have an appropriate retardation according to the purpose of use, such as those for the purpose of compensating for various wavelength plates or birefringence of the liquid crystal layer, viewing angle, and the like. What laminated | stacked the phase difference plate and controlled optical characteristics, such as phase difference, etc. may be used.

  The viewing angle compensation film is a film for widening the viewing angle so that an image can be seen relatively clearly even when the screen of the liquid crystal display device is viewed from a slightly oblique direction rather than perpendicular to the screen. As such a viewing angle compensation phase difference plate, for example, a retardation film, an alignment film such as a liquid crystal polymer, or an alignment layer such as a liquid crystal polymer supported on a transparent substrate is used. A normal retardation plate uses a birefringent polymer film uniaxially stretched in the plane direction, whereas a retardation plate used as a viewing angle compensation film stretches biaxially in the plane direction. Birefringent polymer film, biaxially stretched film such as polymer with birefringence with a controlled refractive index in the thickness direction that is uniaxially stretched in the plane direction and stretched in the thickness direction, etc. Used. Examples of the inclined alignment film include a film obtained by bonding a heat shrink film to a polymer film and stretching or / and shrinking the polymer film under the action of the contraction force by heating, and a film obtained by obliquely aligning a liquid crystal polymer. Can be mentioned. The raw material polymer for the phase difference plate is the same as the polymer described in the previous phase difference plate, preventing coloration due to a change in the viewing angle based on the phase difference by the liquid crystal cell and expanding the viewing angle for good visual recognition. An appropriate one for the purpose can be used.

  Also, from the viewpoint of achieving a wide viewing angle with good visibility, an optically compensated phase difference in which a liquid crystal polymer alignment layer, in particular an optically anisotropic layer composed of a discotic liquid crystal polymer gradient alignment layer, is supported by a triacetylcellulose film. A plate can be preferably used.

  A polarizing plate obtained by bonding a polarizing plate and a brightness enhancement film is usually provided on the back side of a liquid crystal cell. The brightness enhancement film reflects the linearly polarized light of a predetermined polarization axis or circularly polarized light in a predetermined direction when natural light is incident due to a backlight of a liquid crystal display device or the like, or reflection from the back side, and transmits other light. The polarizing plate in which the brightness enhancement film is laminated with the polarizing plate allows light from a light source such as a backlight to be incident to obtain transmitted light in a predetermined polarization state, and reflects without transmitting light other than the predetermined polarization state. Is done. The light reflected on the surface of the brightness enhancement film is further inverted through a reflective layer or the like provided behind the brightness enhancement film and re-incident on the brightness enhancement film, and part or all of the light is transmitted as light having a predetermined polarization state. Luminance can be improved by increasing the amount of light transmitted through the enhancement film and increasing the amount of light that can be used for liquid crystal display image display or the like by supplying polarized light that is difficult to be absorbed by the polarizer. That is, when light is incident through the polarizer from the back side of the liquid crystal cell without using a brightness enhancement film, most of the light having a polarization direction that does not coincide with the polarization axis of the polarizer It is absorbed by the polarizer and does not pass through the polarizer. That is, although depending on the characteristics of the polarizer used, approximately 50% of the light is absorbed by the polarizer, and the amount of light that can be used for liquid crystal image display or the like is reduced accordingly, resulting in a dark image. The brightness enhancement film allows light having a polarization direction that is absorbed by the polarizer to be reflected once by the brightness enhancement film without being incident on the polarizer, and further inverted through a reflective layer provided on the rear side thereof. Repeatedly re-enter the brightness enhancement film, and the brightness enhancement film transmits only polarized light whose polarization direction is such that the polarization direction of light reflected and inverted between the two can pass through the polarizer. Therefore, light such as a backlight can be efficiently used for displaying an image on the liquid crystal display device, and the screen can be brightened.

  A diffusion plate may be provided between the brightness enhancement film and the reflective layer. The polarized light reflected by the brightness enhancement film is directed to the reflective layer or the like, but the installed diffuser plate uniformly diffuses the light passing therethrough and simultaneously cancels the polarized state and becomes a non-polarized state. That is, the diffuser plate returns the polarized light to the original natural light state. The light in the non-polarized state, that is, the natural light state is directed toward the reflection layer and the like, reflected through the reflection layer and the like, and again passes through the diffusion plate and reenters the brightness enhancement film. Thus, while maintaining the brightness of the display screen by providing a diffuser plate that returns polarized light to the original natural light state between the brightness enhancement film and the reflective layer, etc., the brightness unevenness of the display screen is reduced at the same time, A uniform and bright screen can be provided. By providing such a diffuser plate, it is considered that the first incident light has a moderate increase in the number of repetitions of reflection, and in combination with the diffusion function of the diffuser plate, a uniform bright display screen can be provided.

  As the above-mentioned brightness enhancement film, for example, such as a multilayer multilayer film of dielectrics or a multilayer laminate of thin film films having different refractive index anisotropy, it transmits linearly polarized light having a predetermined polarization axis and reflects other light. Such as a cholesteric liquid crystal polymer alignment film or a film substrate whose alignment liquid crystal layer is supported on a film substrate, which reflects either left-handed or right-handed circularly polarized light and transmits other light. Appropriate ones such as those shown can be used.

  Therefore, in the brightness enhancement film of the type that transmits linearly polarized light having the predetermined polarization axis as described above, the transmitted light is directly incident on the polarization plate with the polarization axis aligned, thereby suppressing the absorption loss due to the polarization plate and improving efficiency. Can penetrate well. On the other hand, in a brightness enhancement film of a type that transmits circularly polarized light such as a cholesteric liquid crystal layer, it can be directly incident on a polarizer, but from the point of suppressing absorption loss, the circularly polarized light is linearly polarized through a retardation plate. It is preferable to make it enter into a polarizing plate. Note that circularly polarized light can be converted to linearly polarized light by using a quarter wave plate as the retardation plate.

  A retardation plate that functions as a quarter-wave plate in a wide wavelength range such as a visible light region exhibits, for example, a retardation layer that functions as a quarter-wave plate for light-color light having a wavelength of 550 nm and other retardation characteristics. It can be obtained by a method of superposing a retardation layer, for example, a retardation layer functioning as a half-wave plate. Therefore, the retardation plate disposed between the polarizing plate and the brightness enhancement film may be composed of one or more retardation layers.

  In addition, a cholesteric liquid crystal layer having a structure in which two layers or three or more layers are superposed with a combination of those having different reflection wavelengths can obtain a layer that reflects circularly polarized light in a wide wavelength range such as a visible light region. Based on this, transmitted circularly polarized light in a wide wavelength range can be obtained.

  Moreover, the optical film body (for example, polarizing plate) of this invention may consist of what laminated | stacked the polarizing plate and the optical layer of 2 layers or 3 layers or more like said polarized light separation type polarizing plate. Therefore, a reflective elliptical polarizing plate or a semi-transmissive elliptical polarizing plate in which the above-mentioned reflective polarizing plate or transflective polarizing plate and a retardation plate are combined may be used.

  The optical film body obtained by laminating the optical layer on the polarizing plate can be formed by a method of sequentially laminating separately in the manufacturing process of a liquid crystal display device, etc. There is an advantage that the manufacturing process of a liquid crystal display device and the like can be improved because of excellent quality stability and assembly work. For the lamination, an appropriate adhesive means such as a pressure-sensitive adhesive layer can be used. When adhering the polarizing plate and the other optical layer, their optical axes can be set at an appropriate arrangement angle in accordance with the target phase difference characteristic.

  The optical film body (polarizing plate) according to the present invention and the laminated optical member are provided with an adhesive layer for bonding with other members such as a liquid crystal cell. The pressure-sensitive adhesive layer is not particularly limited, but can be formed with a suitable pressure-sensitive adhesive according to the conventional type such as acrylic. Low moisture absorption and heat resistance due to prevention of foaming and peeling phenomenon due to moisture absorption, deterioration of optical characteristics due to thermal expansion difference, prevention of liquid crystal cell warpage, and formation of a high-quality and durable image display device. It is preferable that it is an adhesive layer excellent in property. Moreover, it can be set as the adhesion layer etc. which contain microparticles | fine-particles and show light diffusivity. The adhesive layer may be provided on a necessary surface as necessary. For example, when referring to a polarizing plate comprising a polarizer and a polarizer protective layer, the adhesive layer is adhered to one or both surfaces of the polarizer protective layer as necessary. A layer may be provided.

  In the present invention, each layer such as a polarizer, a polarizer protective layer, an optical film layer, and an adhesive layer forming the polarizing plate described above includes, for example, a salicylic acid ester compound, a benzophenol compound, a benzotriazole compound, and a cyanoacrylate. It may be a compound having an ultraviolet absorbing ability by a method such as a method of treating with an ultraviolet absorber such as a compound based on nickel or a nickel complex salt compound.

  The optical film body according to the present invention can be preferably used for forming an image display device (corresponding to an optical display device) such as a liquid crystal display device, an organic EL display device, and a PDP.

  The optical film body of the present invention can be preferably used for forming various devices such as a liquid crystal display device. The liquid crystal display device can be formed according to the conventional method. That is, a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell (corresponding to an optical display unit), a polarizing plate or an optical film, and an illumination system as required, and incorporating a drive circuit. However, in the present invention, there is no particular limitation except that the polarizing plate or the optical film according to the present invention is used. As the liquid crystal cell, any type such as a TN type, an STN type, or a π type can be used.

  An appropriate liquid crystal display device such as a liquid crystal display device in which a polarizing plate or an optical film is disposed on one side or both sides of a liquid crystal cell, or a backlight or a reflector used in an illumination system can be formed. In that case, the polarizing plate or optical film by this invention can be installed in the one side or both sides of a liquid crystal cell. When providing a polarizing plate or an optical film on both sides, they may be the same or different. Further, when forming a liquid crystal display device, for example, a single layer or a suitable part such as a diffusing plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusing plate, a backlight, etc. Two or more layers can be arranged.

  The optical film body by this invention can be preferably used for formation of various apparatuses, such as a liquid crystal display device. The liquid crystal display device is formed to have an appropriate structure according to the conventional transmission type, reflection type, or transmission / reflection type in which the optical film body according to the present invention is arranged on one side or both sides of the liquid crystal cell. Can do. Accordingly, the liquid crystal cell forming the liquid crystal display device is arbitrary, and for example, a liquid crystal cell of an appropriate type such as a simple matrix driving type typified by a thin film transistor type may be used.

  Moreover, when providing a polarizing plate and an optical member in the both sides of a liquid crystal cell, they may be the same thing and may differ. Furthermore, when forming the liquid crystal display device, for example, appropriate components such as a prism array sheet, a lens array sheet, a light diffusing plate, and a backlight can be arranged in one or more layers at appropriate positions.

Although this invention demonstrated the example of the polarizing plate as an optical film layer, this invention is not restrict | limited to this, It can apply also only about the laminated body of a polarizing plate and a phase difference plate, and a phase difference plate as an optical film.
<Example>

In the example, the optical film body of the polarizing plate shown in FIG. 1 was manufactured according to the above-described manufacturing method (steps A to E), and cut into a size having an opposing angle length of 6 inches. As the phosphor-containing paint, a cold light ink medium manufactured by Dainippon Ink Co., Ltd. was used. The thickness of the surface protective film was set to 100 μm, the average thickness of the weak adhesive layer was set to 6 μm, and the average thickness of the printed product of optical axis information was set to 0.01 μm. As shown in FIG. 4A, the optical axis information formed in the step C is a triangular printed product, and is configured such that the pixel density in the peripheral portion thereof is smaller than the inside thereof, and a predetermined interval. A plurality of sheets were printed so as to be formed. The optical axis information is substantially transparent as a whole, but can be discriminated in appearance inspection, and can be confirmed more easily by irradiating with black light.
<Comparative example>

In the comparative example, the optical axis information formed in step C is the same manufacturing method as in the example except that the pixel density of the printed product is the same as shown in FIG. The optical film body of the polarizing plate shown was manufactured.
<Evaluation>

  The optical film bodies obtained in the above examples and comparative examples were subjected to defect inspection. This defect inspection was conducted by 10 appearance inspectors inspecting 5 optical film bodies. At this time, an optical film body was used in which defects were randomly arranged near the periphery of the printed product of optical axis information so that five optical film bodies had a total of 15 defects. Then, the probabilities of detecting the defects were compared without notifying the inspector of the total number of defects near the periphery of the printed product of the optical axis information. The results are shown in Table 1. The defect detection rates in Table 1 are detection probabilities with respect to the number of defects. When detected in the example, all 10 inspectors can detect 15 defects under optical axis information (defect detection rate 100%). Therefore, the miss rate was 0%. On the other hand, in the comparative example, a maximum of 5 to a minimum of 1 defect was missed.

  As is clear from the results of the above-described examples and comparative examples, in the examples, the print density (pixel density) in the peripheral portion of the printed product of optical axis information is made smaller than the print density inside the print product. In the comparative example, on the other hand, since the print density of the peripheral part of the printed product and the internal printing density are the same, the optical axis information becomes a hindrance. The result was missed. That is, according to the embodiment of the present invention, the optical axis information can be reliably visually recognized from the outside, and the defects can be reliably detected in the high-precision defect inspection.

The figure explaining an optical film body The figure explaining the example of embodiment of optical axis information The figure explaining the example of embodiment of the cross-sectional shape of the printed matter of optical axis information The figure for demonstrating the pixel density of the printed matter of optical axis information The figure explaining the marking formed in the conventional optical film body

Claims (10)

An optical film body formed by laminating a surface protective film for protecting the surface of the optical film layer on an optical film layer having an optical axis,
When optical axis information related to the optical axis is formed on the surface protective film by printing, the print density of the printed product that is the printed optical axis information is determined from the print density inside the print product. An optical film body formed so as to be smaller.   When forming so that the printing density of the peripheral part of the printed product is smaller than the printing density inside the printed product, the thickness of the peripheral edge of the printed product is smaller than the internal thickness of the printed product. The optical film body according to claim 1, wherein the optical film body is configured as described above.   The optical film body according to claim 2, wherein the printed film is formed so as to gradually reduce the printed thickness from the inside toward the peripheral edge.   The optical film body according to claim 3, wherein the central cross-sectional shape of the printed product is a mountain shape, a trapezoidal shape, or a triangular shape.   4. The optical film according to claim 3, wherein when the printed product is formed such that the printed thickness of the printed product is gradually decreased from the inside toward the peripheral edge, the gradual decrease is a straight line or a curved line. body.   When forming so that the printing density of the peripheral part of the printed product is smaller than the printing density inside the printed product, the pixel density of the peripheral part of the printed product is more than the pixel density inside the printing product. The optical film body according to claim 1, wherein the optical film body is configured to be smaller.   When forming the print density at the periphery of the printed product to be smaller than the print density inside the print product, the pixel size at the periphery of the print product is larger than the pixel size inside the print product. The optical film body according to claim 1, wherein the optical film body is configured to be smaller.   The optical film body according to claim 1, wherein the optical axis information is formed by printing on the surface protective film with a phosphor-containing paint.   The optical film body according to any one of claims 1 to 8, wherein the optical axis information is interposed between a surface protective film and an optical film layer. It is a method for producing an optical film body, in which an optical film layer having an optical axis is laminated with a surface protective film for protecting the surface of the optical film layer,
A printing step for printing optical axis information on the optical axis on the surface protective film;
A bonding step in which the optical axis information is interposed between the surface protective film and the optical film layer when the surface protective film on which the optical axis information is printed in the printing step and the optical film layer are bonded. And having at least
In the printing step, the optical film body is formed so that the printing density of the peripheral portion of the printed product, which is the printed optical axis information, is smaller than the printing density inside the printed product. Production method.

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