TWI834897B - Inspection method and inspection system for long optical laminates - Google Patents

Abstract

The object of the present invention is to be able to read both the first identification information printed on the first long optical film and the second identification information printed on the long optical laminated body in the state of the long optical laminated body. The inspection method of the long optical laminated body of the present invention includes: a first step, which is to inspect the first long optical film F1 to obtain the first defect information; a second step, which is to print the first identification information M on the first 1 long optical film; the third step is to associate the first defect information with the first identification information and memorize it; the fourth step is to inspect the long optical laminate in which the first long optical film is laminated F2 to obtain the second defect information; the fifth step is to print the second identification information on the long optical laminated body; the sixth step is to associate the second defect information with the second identification information and memorize it; Either one of the first identification information and the second identification information is printed by inkjet method, and the other is printed by laser engraving; or, either one is printed by inkjet method using transparent ink, and print the other by inkjet using colored ink.

Description

Inspection method and inspection system for long optical laminates

The present invention relates to an inspection method and an inspection system for a long optical laminated body (such as a polarizing film). The long optical laminated system is laminated with a first long optical film (such as a protective film) and a second long optical film (such as a polarizing film). components). In particular, the present invention relates to an inspection method and an inspection system for a long optical laminated body. The inspection method and inspection system can read the first identification information printed on the first long optical film in the state of the long optical laminated body. , and the second identification information printed on the long optical laminated body, whereby the defect information and the identification information can be appropriately associated.

As a long optical laminate, for example, a polarizing film used in a liquid crystal display device is known. The steps for punching out polarizing films of sizes corresponding to various uses from long polarizing films are as follows, for example.

First, the long polarizing film transported in a roll-to-roll manner is inspected to detect defects in the polarizing film. When a defect is detected, mark the defect location and roll up the polarizing film. The polarizing film as the final product (polarizing film after punching) comes in various sizes according to the user's specifications. Long polarizing films (polarizing film base films) can often be used in common, so polarizing film base films are manufactured in large quantities in advance. , and then punch out the polarizing film base film into polarizing film products of the required size as needed in the future. When punching polarizing film products, you must avoid the defective locations, or remove the polarizing film products with marks on the defective locations as defective products after punching. Therefore, when inspecting a long polarizing film, it is necessary to detect defects and memorize the defect location as defect information.

In order to properly manage defect information and improve the yield of polarizing film products, Patent Document 1 proposes an inspection method for polarizing films. This inspection method prints identification information (at least information on the long-side position of the specific polarizing film) on the polarizing film. The end of the width direction is used to associate the defect information with the identification information. According to the inspection method described in Patent Document 1, defect information of defects generated in the state of the polarizing film can be properly managed.

However, in polarizing films, there are defects that occur not only in the state of the polarizing film in which a protective film and a polarizing element are laminated, but also in the state of a separate protective film (the protective film before being laminated with the polarizing element). Furthermore, it is sometimes difficult to detect defects occurring in the protective film alone when inspecting the polarizing film. Therefore, although the protective film is also inspected individually, the defect information of defects previously detected by this inspection is not properly managed. Specifically, the identification information is not printed on a separate protective film and associated with the defect information.

Furthermore, in order to prevent winding deviation, winding slack, agglomeration, band-shaped protrusions, etc. when rolling the protective film, there are cases where tumble processing is performed. This tumble processing is engraved on the protective film by laser. Microscopic unevenness is formed at the end portion in the width direction (see, for example, Patent Document 2). [Prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent No. 5925609 [Patent Document 2] Japanese Patent No. 5578759

[Problem to be solved by the invention]

The present invention was completed in order to solve the above-mentioned problems of the prior art. The subject is to provide an inspection method and an inspection system for a long optical laminated body. The inspection method and the inspection system can read the sequence in the state of the long optical laminated body. Both the first identification information printed on the first long optical film (such as protective film) and the second identification information printed on the long optical laminate (such as polarizing film) can be used to combine defect information and identification information Make connections appropriately. [Technical means to solve problems]

In order to solve the above problems, the present inventors conducted intensive research and found that the first identification information to be printed on the first long optical film and the second identification information to be printed on the long optical laminate can be Either by inkjet printing and the other by laser marking; or by inkjet printing using clear ink and printing either by inkjet using colored ink. By printing the other with ink, even if the first identification information and the second identification information overlap, they can be distinguished and read, thereby completing the present invention. That is, in order to solve the above-mentioned problems, the present invention provides an inspection method for a long optical laminated body. The inspection method is characterized by including: a first step of inspecting a first long optical film to obtain the first long optical film. The defect information is the first defect information; the second step is to print the first identification information in the width direction of the above-mentioned first elongated optical film at specific intervals in the longitudinal direction of the above-mentioned first elongated optical film end; the third step is to associate and memorize the first defect information of the first long optical film with the first identification information; the fourth step is to inspect the laminated first long optical film and an optical laminated body made of a long strip of the second long optical film, and obtain the defect information of the above-mentioned long optical laminated body, which is the second defect information; in the fifth step, it is in the long side direction of the above-mentioned long optical laminated body Printing the second identification information on the width direction ends of the above-mentioned long optical laminated body at specific intervals; and the sixth step is to combine the above-mentioned second defect information of the above-mentioned long optical laminated body with the above-mentioned second identification The information is associated and remembered; for the above-mentioned first identification information to be printed in the above-mentioned step 2 and the above-mentioned second identification information to be printed in the above-mentioned step 5, any one of them is printed by inkjet method, and by Print the other by laser marking; or, print either by inkjet using clear ink, and the other by inkjet using colored ink.

In the present invention, "defect information" means information including at least defect locations. Moreover, "first identification information" means information including at least information specifying the position in the longitudinal direction of the first elongated optical film. Furthermore, "second identification information" means information including at least information on the longitudinal position of a specific long optical laminated body. According to the present invention, the first defect information of the first long optical film is obtained in the first step, the first identification information of the first long optical film is printed in the second step, and the first defect information is combined with the first long optical film in the third step. 1. Recognize information, establish associations and remember it. Furthermore, in the 4th step, the second defect information of the long optical laminated body is obtained, in the 5th step, the second identification information of the long optical laminated body is printed, and in the 6th step, the second defect information and the second identification information are created. associate and remember. Either one of the first identification information and the second identification information is printed by inkjet printing, and the other is printed by laser engraving; or, either one is printed by inkjet printing using transparent ink. , printing the other by inkjet using colored ink. The transparent ink is an ink that emits fluorescence by irradiating light. An example of the transparent ink is UV (UltraViolet, ultraviolet) ink that emits fluorescence by irradiating ultraviolet rays.

That is, according to the present invention, the first identification information and the second identification information are printed by any one of the following methods (1) to (6). (1) The first identification information: inkjet method using transparent ink, the second identification information: laser engraving (2) The first identification information: inkjet method using colored ink, the second identification information: laser engraving (3) The first identification information: laser marking, the second identification information: inkjet method using transparent ink (4) The first identification information: laser marking, the second identification information: inkjet method using colored ink (5) The first identification information: the inkjet method using transparent ink, the second identification information: the inkjet method using colored ink (6) The first identification information: the inkjet method using colored ink, the second identification information: the inkjet method using transparent ink Therefore, according to the findings of the present inventors, even if the first identification information and the second identification information overlap, they can be distinguished and read. That is, the defect information and the identification information can be appropriately associated (the first defect information is associated with the first identification information, and the second defect information is associated with the second identification information). Therefore, for example, by reading the first identification information and using the relationship between the first defect information and the first identification information memorized in the third step, it is possible to avoid the defective position generated in the state of the first long optical film. And blanking products. Furthermore, for example, by reading the second identification information and using the correlation between the second defect information and the second identification information memorized in step 6, it is possible to avoid the defective position generated in the long optical laminated body. Blanking products. Furthermore, in the present invention, the first to sixth steps do not have to be executed in this order. For example, the first step may be executed after the second step is executed. Alternatively, you may perform step 4 after performing step 5.

In the present invention, it is preferable that in the above-mentioned second step, the above-mentioned first identification information is printed by an inkjet method using transparent ink, and in the above-mentioned fifth step, the above-mentioned second identification information is printed by laser engraving. information.

As described above, as a method of printing the first identification information and the second identification information, any one of the methods (1) to (6) can be used. However, according to the research results of the present inventors, the easiest way to distinguish and read the first identification information and the second identification information is to print the first identification information using an inkjet method using transparent ink. The second identification information is printed by laser engraving. Therefore, according to the above-mentioned preferred method, the defect information and the identification information can be more appropriately associated (the first defect information is associated with the first identification information, the second defect information is associated with the second identification information).

In the present invention, it is preferable to further include a seventh step of associating and memorizing the first defect information of the first long optical film with the second identification information of the long optical laminated body. .

According to the above preferred method, when memorizing the second defect information of the long optical laminated body, it is not only associated with the second identification information of the long optical laminated body, but also associated with the first defect information of the first long optical film. In other words, the first defect information and the second defect information can be managed in an integrated manner based on the second identification information of the long optical laminated body. Therefore, after performing the seventh step, the width direction end portion of the first long optical film constituting the long optical laminate is cut (for example, the knurled portion of the protective film is cut), thereby removing the first identification information, and can also appropriately associate defect information with identification information (associate the first defect information and the second defect information with the second identification information). Also, for example, when reading the second identification information, the correlation between the second defect information and the second identification information memorized in step 6 is used, and the correlation between the first defect information and the second identification information memorized in step 7 is used. This allows the product to be punched out while avoiding the defective locations that occur in the first long optical film and the long optical laminated body. That is, the man-hour of reading the first identification information when punching products can be saved.

In the present invention, it is preferable to further include an eighth step based on the first identification information and the first defect information of the first long optical film, and the second identification of the long optical laminated body. Information and the above-mentioned second defect information, mark the defective position of the above-mentioned long optical laminate.

According to the above-mentioned preferred method, since the defective position is marked with a mark, the defective position can be identified visually.

The present invention can be suitably used when the first elongated optical film is a protective film, the second elongated optical film is a polarizing element, and the elongated optical laminated body is a polarizing film. Moreover, the present invention can also be used in the case where the above-mentioned first elongated optical film is a retardation film and the above-mentioned second elongated optical film is a polarizing film. Furthermore, the present invention is also applicable to the case where the first elongated optical film is a reflective polarizing element and the second elongated optical film is a polarizing film.

According to the findings of the present inventors, when a knurled portion is formed on the width direction end of the first long optical film, even if the first identification information is printed on the knurled portion by an inkjet method, The corresponding portion (the portion where the knurled portion is formed or the portion where the knurled portion is scheduled to be formed) can also be read by distinguishing the first identification information from the concavities and convexities of the knurled portion. On the other hand, if the second identification information is printed on a portion corresponding to the knurled portion by laser marking, it may be difficult to distinguish the second identification information from the unevenness of the knurled portion and read it. Therefore, in the present invention, when the knurled portion is formed on the end portion of the first elongated optical film in the width direction, it is preferable that the first identification information is printed by an inkjet method in the second step. Printing is performed on the portion of the first elongated optical film corresponding to the knurled portion. Thereby, the effective width of the first long optical film will not be narrowed due to printing of the first identification information, thereby improving the yield rate. Furthermore, in the present invention, it is preferable that a knurled portion is formed on the width direction end of the first long optical film, and in the fifth step, the second identification information is printed on the first long optical film. The optical film is located at a portion of the long optical laminate located inward in the width direction from the knurled portion. Thereby, the second identification information and the unevenness of the knurled portion can be reliably distinguished and read.

In addition, in order to solve the above problems, the present invention also provides an inspection system for a long optical laminated body. The inspection system is characterized by including: a first inspection device that inspects the first long optical film to obtain the first long optical film. The defect information of the film is the first defect information; the first printing device prints the first identification information on the first long optical film at specific intervals in the longitudinal direction of the first long optical film. Width direction end portion; a first operation memory device that associates and memorizes the first defect information of the first long optical film with the first identification information; a second inspection device that inspects the first inspection layer The long optical laminate of the long optical film and the second long optical film obtains the defect information of the above long optical laminate, which is the second defect information; the second printing device is located on the length of the above long optical laminate. The second identification information is printed on the end of the width direction of the above-mentioned long optical laminated body at specific intervals in the edge direction; the second operation memory device combines the above-mentioned second defect information of the above-mentioned long optical laminated body with the above-mentioned second defect information. 2. The identification information is associated and memorized; the above-mentioned first identification information to be printed by the above-mentioned first printing device and the above-mentioned second identification information to be printed by the above-mentioned second printing device are printed by inkjet method Either of them, and print the other by laser engraving; or, print either of them by inkjet using transparent ink, and print the other by inkjet using colored ink. By. [Effects of the invention]

According to the present invention, both the first identification information printed on the first long optical film and the second identification information printed on the long optical laminated body can be read in the state of the long optical laminated body. Defect information and identification information can be appropriately associated.

Hereinafter, with appropriate reference to the accompanying drawings, an inspection method for a long optical laminated body (hereinafter appropriately referred to as the "inspection method") and an inspection system for a long optical laminated body (hereinafter appropriately referred to as the "inspection method") according to one embodiment of the present invention will be described. System") for explanation. The inspection object of the inspection method of this embodiment is a film in which a first elongated optical film and a second elongated optical film are laminated in a elongated optical laminate system. In this embodiment, description will be given as an example in which the first elongated optical film is a protective film, the second elongated optical film is a polarizing element, and the elongated optical laminated body is a polarizing film. First, a specific example of the long optical laminated body (polarizing film) will be described.

＜Long optical laminate＞ The polarizing film as a long optical laminated body is produced by a manufacturing method including the following steps: (A) The polyvinyl alcohol-based film that has been dyed, cross-linked, and stretched is dried to produce a second long optical laminated body. The polarizing element of the film; (B) laminating on one or both sides of the second long optical film (polarizing element) as a protective film for the first long optical film; and (C) performing heat treatment after lamination.

The various treatments such as dyeing treatment, cross-linking treatment, and stretching treatment of the polyvinyl alcohol-based film do not have to be carried out separately, but can also be carried out at the same time, and the order of each treatment can also be arbitrary. Furthermore, as the polyvinyl alcohol-based film, a polyvinyl alcohol-based film subjected to swelling treatment can also be used. Usually, the polyvinyl alcohol-based film is immersed in a solution containing iodine or a dichroic dye, allowed to absorb the iodine or dichroic dye and dyed, then washed, and then stretched in a solution containing boric acid, borax, etc. After uniaxial stretching at a magnification of 3 to 7 times, it is dried. After extending in a solution containing iodine or a dichroic dye, further extending in a solution containing boric acid or borax (secondary extension), and then drying, the orientation of the iodine becomes higher and the polarization characteristics change. Good, so it is particularly good.

Examples of the polyvinyl alcohol-based polymer constituting the polyvinyl alcohol-based film include vinyl acetate polymerized and then saponified; or vinyl acetate mixed with a small amount of unsaturated carboxylic acid, unsaturated sulfonic acid, cationic Monomers and other copolymerizable monomers are copolymerized. The average degree of polymerization of the polyvinyl alcohol-based polymer is not limited and can be used arbitrarily, but is preferably 1,000 or more, more preferably 2,000 to 5,000. Moreover, the degree of saponification of the polyvinyl alcohol-based polymer is preferably 85 mol% or more, more preferably 98 to 100 mol%.

The thickness of the second elongated optical film (polarizing element) produced is usually 5 to 80 μm, but is not limited thereto, and there is no particular method for adjusting the thickness of the second elongated optical film (polarizing element). If limited, common methods such as tenter, roll stretching or calendering can be used.

The bonding of the second elongated optical film (polarizing element) and the first elongated optical film (protective film) is not particularly limited. For example, an adhesive containing a vinyl alcohol-based polymer, or an adhesive containing at least boric acid or borax, can be used. Adhesives such as glutaraldehyde, water-soluble cross-linking agents of vinyl alcohol polymers such as melamine and oxalic acid are used. The adhesive layer for bonding the second long optical film (polarizing element) and the first long optical film (protective film) is formed as a coating dry layer of an aqueous solution. When preparing the aqueous solution, other additives or acids may also be prepared as needed. Catalyst.

An appropriate transparent film can be used for the first long optical film (protective film) attached to one or both sides of the second long optical film (polarizing element). Among them, it is preferable to use a film containing a polymer excellent in transparency, mechanical strength, thermal stability, water resistance, etc. Examples of the polymer include acetate-based resins such as triacetyl cellulose, polycarbonate-based resins, polyarylates, polyester-based resins such as polyethylene terephthalate, polyimide-based resins, polyimide-based resins, and polyester-based resins. Polyolefin-based resins, polyether-based resins, polystyrene-based resins, polyolefin-based resins such as polyethylene and polypropylene, polyvinyl alcohol-based resins, polyvinyl chloride-based resins, polynorphenyl-based resins, (methyl) Acrylic resin, polymethyl methacrylate resin, liquid crystal polymer, etc. The film can be produced by any method among casting method, calendering method, and extrusion method.

Furthermore, polymer films described in Japanese Patent Application Laid-Open No. 2001-343529 (WO01/37007), for example, include thermoplastic films containing (A) a substituted and/or unsubstituted imine group in the side chain. Resin, and (B) a resin composition of a thermoplastic resin having a substituted and/or unsubstituted phenyl group and a nitrile group in the side chain. Specific examples include a film containing a resin composition composed of an alternating copolymer of isobutylene and N-methylmaleimide and an acrylonitrile-styrene copolymer. As the film, a film containing 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, they can eliminate uneven defects caused by the strain of the long optical laminate (polarizing film), and because the moisture permeability is small, they have excellent humidification durability. Excellent.

Moreover, it is preferable that the 1st long optical film (protective film) is as colorless as possible. Therefore, it is better to use Rth=[(nx＋ny)/2‒nz]·d (where nx and ny are the principal refractive index in the film plane, nz is the refractive index in the film thickness direction, and d is the film thickness). The first long optical film (protective film) with a phase difference value in the film thickness direction of -90 nm to +75 nm. By using a phase difference value (Rth) in the thickness direction of -90 nm to +75 nm, the coloring of the long optical laminate (polarizing film) caused by the first long optical film (protective film) can be basically eliminated ( optical coloring). The phase difference value (Rth) in the thickness direction is preferably -80 nm to +60 nm, and particularly preferably -70 nm to +45 nm.

As the first long optical film (protective film), a (meth)acrylic resin is preferred in terms of polarization characteristics, durability, and the like. In addition, an acetate resin such as triacetyl cellulose is preferred, and a triacetyl cellulose film whose surface has been saponified with an alkali or the like is particularly preferred. Furthermore, when the first long optical film (protective film) is bonded to both sides of the second long optical film (polarizing element), the first long strip containing different polymers can also be used on the front and back. Optical film (protective film).

The thickness of the first long optical film (protective film) is arbitrary, but is usually 500 μm or less, preferably 1 to 300 μm, particularly preferably 5 μm, in order to achieve thinning of the long optical laminated body (polarizing film). ~200 μm.

As long as the first long optical film (protective film) does not interfere with the purpose of the present invention, it may also be subjected to hard coating treatment, anti-reflection treatment, anti-sticking, diffusion and anti-glare treatment, etc. The hard coating treatment is performed to prevent damage to the surface of the long optical laminate (polarizing film). For example, it can be formed by attaching a hardened film to the surface of the first long optical film (protective film). The cured film is made of an appropriate ultraviolet curable resin such as silicone to obtain excellent hardness, sliding properties, etc.

On the other hand, the anti-reflection treatment is performed to prevent external light from being reflected on the surface of the long optical laminate (polarizing film), and can be achieved by forming an anti-reflection film according to a conventional method. In addition, the anti-adhesive treatment is performed to prevent close contact with the adjacent layer, and the anti-glare treatment is performed to prevent external light from being reflected on the surface of the long optical laminated body (polarizing film) and thus hindering the long optical laminated body (polarizing film). Visibility of transmitted light can be achieved, for example, by the following method: surface roughening by sandblasting or embossing, or mixing of transparent fine particles, or other appropriate methods. The surface of the film) is given a fine uneven structure.

Examples of the above-mentioned transparent fine particles include silicon oxide and aluminum oxide, titanium dioxide and zirconium oxide, tin oxide and indium oxide, cadmium oxide and antimony oxide with an average particle diameter of 0.5 to 20 μm. Inorganic fine particles with conductivity can be used. , organic microparticles including crosslinked or uncrosslinked polymer granules, etc. can be used. Usually, the usage amount of transparent microparticles is 2 to 70 parts by mass, especially 5 to 50 parts by mass per 100 parts by mass of transparent resin.

Furthermore, the anti-glare layer containing transparent fine particles may be provided as the transparent protective layer itself or as a coating layer on the surface of the transparent protective layer. The anti-glare layer can also serve as a diffusion layer (viewing angle compensation function, etc.) that diffuses the light transmitted through the long optical laminate (polarizing film) and expands the viewing angle. Furthermore, the above-mentioned anti-reflection layer, anti-adhesion layer, diffusion layer, anti-glare layer, etc. can also be provided separately as an optical layer and a transparent protective layer including a sheet provided with these layers.

<Inspection method of this embodiment> Hereinafter, the inspection method of this embodiment will be described. FIG. 1 is a flowchart showing the schematic steps of the inspection method according to this embodiment. As shown in FIG. 1 , the inspection method of this embodiment includes: steps S1 to S4 performed in the manufacturing step of the first long optical film (protective film), and the manufacturing step of the long optical laminated body (polarizing film). Steps S5 to S12 are executed in the process. Below, each step is explained in order.

[Steps performed in the manufacturing step of the first long optical film] In the manufacturing step of the first elongated optical film, the first step S2 to the third step S4 are performed. Furthermore, in this embodiment, the knurl processing step S1 is performed.

(Rolling processing step S1) In the knurl processing step S1, knurl processing is performed on the width direction end portion of the first elongated optical film to form a knurled portion. The specific details of knurl processing are as described in Patent Document 2, for example, and are well known, so the detailed description is omitted here.

(Step 1 S2) FIG. 2 is a perspective view schematically showing the schematic configuration of the inspection system for executing the first step S2 to the third step S4. As shown in FIG. 2 , in the first step S2 , the first inspection device 1 provided in the inspection system 100 inspects the conveyance by the conveyance drum R in a roll-to-roll manner (conveyance in the direction indicated by the thick solid line arrow in FIG. 2 ). The first long optical film F1 is used to obtain the defect information of the first long optical film F1, which is the first defect information. The first inspection device 1 is provided with: a camera mechanism 1a, which is arranged to face the front surface of the first elongated optical film F1; and an image processing mechanism 1b, which is electrically connected to the camera mechanism 1a. 1. Perform appropriate image processing on the photographed image of the front side of the long optical film F1. As the imaging mechanism 1a, a line sensor in which imaging elements are arranged linearly along the width direction of the first elongated optical film F1, or an area sensor in which imaging elements are arranged in a matrix can be used. The field of view of the imaging mechanism 1a is equal to or larger than the effective width of the first long optical film F1 (the width used for the product). The image processing unit 1b performs known image processing such as binarization on the captured image, thereby extracting the pixel area corresponding to the defect present in the first long optical film F1. Furthermore, the image processing mechanism 1b specifies the defect position (coordinates of the pixel area corresponding to the defect) in the captured image, and acquires information including at least the specified defect position as the first defect information. The acquired first defect information is input to the first operation memory device 4 provided in the inspection system 100 .

(Step 2 S3) In the second step S3, the first printing device 2 provided in the inspection system 100 prints the first identification information M in columns at specific intervals (for example, equal intervals of 1 m) in the longitudinal direction of the first long optical film F1. Printed on the width direction end portion (preferably the knurled portion) of the first long optical film F1. FIG. 2 illustrates an example in which the first identification information M1 to M3 are printed in sequence from the front end side (downstream side in the conveyance direction) of the first long optical film F1. The first identification information M is information including at least information specifying the position in the longitudinal direction of the first long optical film F1. The first identification information M is, for example, a QR code or a barcode that represents a numerical value that increases or decreases sequentially from the front end side of the first long optical film F1 (the numerical value is used to specify the longitudinal position of the first long optical film F1 ). In addition to the information specifying the longitudinal position of the first long optical film F1, the first identification information M may also include the date and time of printing, the manufacturing number of the first long optical film F1, and the printing steps. categories and other accompanying information.

In this embodiment, the printing of the first identification information M by the first printing device 2 is controlled by the first operation and memory device 4 . Specifically, the movement amount of the first elongated optical film F1 in the conveyance direction is measured using a distance meter 3 such as a rotary encoder, and is input to the first calculation memory device 4 . The first operation memory device 4 sends a control signal to the first printing device 2 at specific intervals based on the movement amount input from the distance meter 3, so that the first printing device 2 prints the first identification at specific intervals. InformationM. Furthermore, in this embodiment, the case where the first operation memory device 4 also has the function of controlling the first printing device 2 is taken as an example. However, the present invention is not limited to this, and the first operation memory device 4 may also be used. A control device other than the memory device 4 controls the configuration of the first printing device 2 .

The first printing device 2 of this embodiment prints the first identification information M by using an inkjet method. As a preferred form, the first printing device 2 of this embodiment prints the first identification information M by using an inkjet method using transparent ink. Specifically, in this embodiment, the first identification information M is printed by an inkjet method using UV ink as a transparent ink, and the UV ink emits fluorescence by irradiating ultraviolet rays. As the first printing device 2, for example, an inkjet printer "VJ1000 series" manufactured by Videojet Corporation or an inkjet printer "Gravis UX series" manufactured by Hitachi Industrial Machinery Co., Ltd. can be used.

(Step 3 S4) In the third step S4, the first operation and memory device 4 associates the first defect information of the first elongated optical film F1 with the first identification information M and stores them. Details are as follows. For example, the first inspection device 1 detects the defect D1 shown in Figure 2, specifies the position of the defect D1 in the captured image (the coordinates of the pixel area corresponding to the defect D1), and inputs this as the first defect information to The first operation memory device 4. Since the amount of movement of the first long optical film F1 in the conveyance direction has been input to the first arithmetic memory device 4 from the rangefinder 3, the first arithmetic memory device 4 can grasp the time when the defect D1 is detected (specified photographing). The distance between the coordinates of the pixel area corresponding to the defect D1 in the image) and the time when the first identification information M is printed by the first printing device 2, the distance that the first long optical film F1 moves in the conveying direction . Based on the movement amount of the first long optical film F1 between the two points in time and the coordinates of the pixel area corresponding to the defect D1 in the captured image, the first operation memory device 4 can calculate the specific first identification information M ( In the example shown in FIG. 2 , it is the distance X1 from the first identification information M3) to the defect D1 (the distance along the long side direction of the first long optical film F1). Furthermore, the first arithmetic memory device 4 can calculate the distance from the edge of the first elongated optical film F1 in the width direction to the defect D1 (along the first elongated optical film F1) based on the coordinates of the pixel area corresponding to the defect D1 in the captured image. The distance in the width direction of the long optical film F1) Y1. The first operation memory device 4 associates and memorizes at least the first identification information M (M3) with the coordinates (X1, Y1) of the defect D1 based on the first identification information M (M3).

[Steps performed in the manufacturing process of the long optical laminated body] The first long optical film F1 produced in the above manufacturing steps (the first identification information M is printed on the first long optical film in the rolling processing section by inkjet method) is rolled into a roll to form a material roll. cylinder. The first long optical film F1 that has been produced as a material roll is conveyed to the manufacturing step of the long optical laminated body. In the manufacturing step of the long optical laminated body, the transported material roll of the first long optical film F1 is used. As shown in FIG. 1 , the manufacturing steps of the long optical laminated body of this embodiment include step No. 1 and step No. 2. In the manufacturing process of the long optical laminated body of this embodiment, after performing the 4th step S6 to the 7th step S9 in step No. 1, the 4th step S11 and the 6th step S12 are performed in step No. 2. Moreover, in the manufacturing process of the long optical laminated body of this embodiment, the bonding step S5 is performed in step No. 1, and the reading step S10 is performed in step No. 2.

(Laying step S5) In step No. 1, the material roll of the first long optical film (protective film) F1 is rolled out, and the material roll of the second long optical film (polarizing element) is rolled out. Thereafter, in the bonding step S5, the first elongated optical film F1 is bonded to one or both sides of the second elongated optical film via an adhesive or the like as described above, thereby obtaining the laminated first elongated optical film F1 and a long optical laminate (polarizing film) F2 made of a second long optical film.

(Step 4 S6) FIG. 3 is a perspective view schematically showing the schematic configuration of the inspection system for executing the fourth step S6 to the sixth step S8. As shown in FIG. 3 , in the fourth step S6 , the second inspection device 5 provided in the inspection system 100 inspects the conveyance by the conveyance roll R in a roll-to-roll manner (conveyance in the direction indicated by the thick solid line arrow in FIG. 3 ) of the long optical laminated body F2, the defect information of the long optical laminated body F2, which is the second defect information, is obtained. The second inspection device 5 is equipped with a camera mechanism 5 a and an image processing mechanism 5 b like the first inspection device 1 shown in FIG. 2 , and has the same functions as the first inspection device 1 , so detailed description is omitted here. The second inspection device 5 specifies the defect position (coordinates of the pixel area corresponding to the defect) in the captured image, thereby acquiring information including at least the specified defect position as second defect information. The acquired second defect information is input to the second operation memory device 8 provided in the inspection system 100 .

(Step 5 S7) In the fifth step S7, the second printing device 6 provided in the inspection system 100 prints the second identification information N at specific intervals (for example, equal intervals of 1 m) in the longitudinal direction of the long optical laminated body F2. At the width direction end portion of the long optical laminated body F2 (preferably, the portion of the first long optical film F1 located inside the long optical laminated body F2 in the width direction than the knurled portion). FIG. 3 illustrates an example in which the second identification information N1 to N3 are sequentially printed from the front end side (downstream side in the conveyance direction) of the long optical laminated body F2. Furthermore, in fact, the first identification information M series is printed on the first long optical film F1 constituting the long optical laminate F2, and the illustration of the first identification information M is omitted in FIG. 3 for the sake of convenience. The second identification information N at least includes information on the longitudinal position of the specific long optical laminate F2, and the first identification information M at least includes information on the specific longitudinal position of the first long optical film F1. The second identification information N is the same as the first identification information M except for this, so the detailed description is omitted here.

Furthermore, in this embodiment, the second identification information N printed on the long optical laminated body F2 is printed on the first long optical film F1 on which the first identification information M is also printed. However, the present invention does not Limited to this. For example, when the first elongated optical film (protective film) F1 is bonded to both sides of the second elongated optical film (polarizing element) to form a elongated optical laminated body (polarizing film) F2, the second elongated optical film (polarizing element) may be 1. The identification information M is printed on one of the first long optical films (protective films) F1, and the second identification information N is printed on the other first long optical film F1 (which does not print the first identification information M). Protective film, can also double as retardation film). Also, for example, the first elongated optical film (protective film) F1 is bonded to both sides of the second elongated optical film (polarizing element), and a retardation film is further bonded to one of the first elongated optical films to form a long optical film. In the case of a strip of optical laminate (polarizing film with phase difference function) F2, the first identification information M can also be printed on another first strip of optical film (protective film) F1, and the second identification information N can be printed Printed on phase difference film.

The printing of the first identification information M using the first printing device 2 is controlled by the first operation memory device 4. Similarly, the printing of the second identification information N using the second printing device 6 is controlled by It is controlled by the second operation memory device 8 . The specific control content is the same as the control of printing the first identification information M by the first printing device 2, so the detailed description is omitted here.

The second printing device 6 of this embodiment is different from the first printing device 2 in that it prints the second identification information N by laser marking. As the second printing device 6, for example, various known printing devices can be applied. These printing devices have the function of printing by laser marking using _CO2 laser, so detailed description is omitted here.

(Step 6 S8) In step 6 S8, the second computing memory device 8 associates the second defect information of the long optical laminate F2 with the second identification information N and stores it. Specifically, the first operation and memory device 4 associates and memorizes the first defect information of the first strip optical film F1 with the first identification information M in the same order, so detailed description is omitted. The second operation and memory device 8 uses the movement amount of the strip optical laminate F2 in the conveying direction input from the rangefinder 7 having the same structure as the rangefinder 3 to associate and memorize at least the second identification information N (the second identification information N3 in the example shown in Figure 3) with the coordinates (X2, Y2) of the defect D2 based on the second identification information N (N3).

(Step 7 S9) FIG. 4 is a perspective view schematically showing the schematic structure of the inspection system for executing the seventh step S9. In the seventh step S9, the second operation memory device 8 associates the first defect information of the first long optical film F1 with the second identification information of the long optical laminated body F2 and stores them. Specifically, a first reading device 9 for reading the first identification information M (the first identification information M1 to M3 is shown in FIG. 4 ) and a first reading device 9 for reading the second identification information N (FIG. 4 The middle figure shows the second reading device 10 of the second identification information N1-N3), which combines the first identification information M read by the first reading device 9 and the second reading device 10. The identification information N is input to the second operation storage device 8 . Here, the correlation between the first defect information of the first long optical film F1 stored in the first operation memory device 4 and the first identification information M (first identification information) has been input and stored in the second operation memory device 8 in advance. The relationship between the information M and the coordinates of the defect based on the first identification information M). When the correlation between the first defect information and the first identification information M is input, the first operational memory device 4 and the second operational memory device 8 can be electrically connected, and the first operational memory device 4 can be sent to the second operational memory device 8. It can also be downloaded from the first operation storage device 4 and manually input to the second operation storage device 8 . Furthermore, the amount of movement of the long optical laminated body F2 in the conveyance direction is input to the second arithmetic storage device 8 from the rangefinder 11 having the same configuration as the rangefinder 3 .

The second operation memory device 8 can grasp the time when the first reading device 9 reads the first identification information M (first identification Between the time when the information M is input into the second operation memory device 8) and the time when the second reading device 10 reads the second identification information N (the time when the second identification information N is input into the second operation memory device 8) , the distance that the long optical laminated body F2 moves in the conveyance direction. Based on the movement amount of the long optical laminated body F2 between the two points in time, the second operation memory device 8 can calculate the positions of the first identification information M and the second identification information N along the long side direction of the long optical laminated body F2 Offset (in the example shown in FIG. 4, it is the position offset dX between the first identification information M3 and the second identification information N3). Therefore, the second operation memory device 8 can calculate the relationship between the first defect information and the first identification information M of the first long optical film F1 based on the pre-memorized relationship between the first identification information M and the second identification information N. Positional shift associates the first defect information of the first long optical film F1 with the second identification information N of the long optical laminated body F2 and memorizes it. In other words, the second identification information N and the coordinates of the defect based on the second identification information N can be associated and memorized. In this way, by executing the seventh step S9, the first defect information and the second defect information can be managed comprehensively based on the second identification information N of the long optical laminated body F2. The long optical laminated body F2 after performing the seventh step S9 is wound into a roll shape and transferred to the No. 2 step.

FIG. 5 is a side view schematically showing an example of the schematic configuration of the first reading device 9 and the second reading device 10 (a side view viewed from the width direction of the elongated optical laminate F2). FIG. 5( a ) shows a schematic configuration example of the first reading device 9 , and FIG. 5( b ) shows a schematic configuration example of the second reading device 10 . As shown in FIG. 5(a) , the first reading device 9 includes a UV illumination 91 that emits ultraviolet rays and an imaging mechanism (area sensor) 92 . By irradiating the front surface of the long optical laminated body F2 with ultraviolet rays emitted from the UV illumination 91, the first identification information M printed with the transparent ink (UV ink) emits fluorescence. Thereby, in the photographed image acquired by the imaging mechanism 92 disposed on the same side as the UV illumination 91 (the upper side in the example shown in FIG. 5(a) ) with respect to the front surface of the long optical laminated body F2 , the image captured by the first The pixel area corresponding to the identification information M becomes brighter (the pixel area corresponding to the second identification information N becomes darker in the same manner as the background), so that the first identification information M and the second identification information N can be distinguished and read. Furthermore, as the UV illumination 91, for example, ultraviolet rays with an emission wavelength of about 200 to 400 nm can be used, and preferably, ultraviolet rays with an emission wavelength of about 365 nm can be used. Furthermore, as the imaging mechanism 92, for example, an area sensor with a high-speed shutter having a shutter speed (exposure time) of about 30 to 150 μsec can be used.

As shown in FIG. 5(b) , the second reading device 10 is provided with an illumination 101 disposed on one side (the lower side in the example shown in FIG. 5(b) ) with respect to the front of the long optical laminated body F2 ), emitting parallel light beams; and a camera mechanism (area sensor) 102, which is disposed on the other side (the upper side in the example shown in FIG. 5(b)) relative to the front of the long optical laminated body F2, to receive the long The light of strip optical laminated body F2. The parallel light beam emitted from the illumination 101 and irradiated to the front surface of the long optical laminated body F2 is scattered by the second identification information N printed by laser marking. Thereby, in the captured image acquired by the camera 102, the pixel area corresponding to the second identification information N becomes dark (the pixel area corresponding to the first identification information M becomes bright in the same manner as the background), so that it can be distinguished The second identification information N and the first identification information M are read.

Furthermore, although detailed description is omitted, when the first identification information M is printed using ordinary colored ink, as a reading device for reading the first identification information M, the one shown in FIG. 5(b) is used. The illumination 101 is replaced with a reading device that emits diffuse light, so that in the captured image acquired by the camera 102, the pixel area corresponding to the first identification information M becomes dark (the pixel area corresponding to the second identification information N The pixel area becomes brighter like the background), so that the first identification information M and the second identification information N can be distinguished and read.

(Reading step S10) In step No. 2, the long optical laminated body F2 rolled into a roll is rolled out. After that, the reading step S10 is first performed. 6 is a perspective view schematically showing the schematic configuration of the inspection system for executing the reading step S10, the second fourth step S11, and the sixth step S12 (the fourth step and the sixth step after executing the seventh step S9). . Furthermore, in fact, the first identification information M is printed on the first long optical film F1 constituting the long optical laminate F2, and the illustration of the first identification information M is omitted in FIG. 6 for convenience. As shown in FIG. 6 , in the reading step S10 , the reading is performed by the second reading device 12 having the same configuration as the second reading device 10 (refer to FIGS. 4 and 5(b) ) included in the inspection system 100 . Second identification information N. The read second identification information N is input to the second memory device 8 .

(Step 4 (2nd time) S11) In the second fourth step S11, the second inspection device 13 (camera mechanism 13a and image processing mechanism 13b) having the same configuration as the second inspection device 5 included in the inspection system 100 inspects the roll pair by conveying the roll R. The long optical laminated body F2 is conveyed in a roll (carried in the direction indicated by the thick solid line arrow in FIG. 6 ), and the defect information of the long optical laminated body F2, which is the second defect information, is acquired. The acquired second defect information is input to the second operation memory device 8 .

(Step 6 (2nd time) S12) In the second sixth step S12, the second operation memory device 8 combines the second defect information of the long optical laminated body F2 acquired by the second inspection device 13 and the second identification information N read by the second reading device 12. Make connections and remember them. Specifically, the second arithmetic storage device 8 uses the movement amount of the elongated optical laminated body F2 in the conveying direction input from the rangefinder 14 having the same configuration as the rangefinder 3 to grasp the information read by the second reading device 12 The long optical laminated body F2 moves in the conveyance direction between the time when the second identification information N and the time when the second inspection device 13 detects the defect (the time when the coordinates of the pixel area corresponding to the defect in the captured image are specified). distance, thereby associating and memorizing at least the second identification information N with the coordinates of the defect based on the second identification information N.

In this embodiment, the case where two inspections (the inspection using the second inspection device 5 and the inspection using the second inspection device 13) are performed in the manufacturing step of the long optical laminated body F2 is explained as an example. When the inspection is performed three times or more, in the second and subsequent inspections, the reading step S10, the fourth step S11, and the sixth step S12 can be repeatedly performed.

According to the inspection method of this embodiment described above, since the first identification information M is printed by inkjet printing and the second identification information N is printed by laser engraving, according to the knowledge of the present inventors, even if the first identification information M is printed, The 1 identification information M overlaps with the 2nd identification information N, and the two can also be read by distinguishing them. That is, the defect information and the identification information can be appropriately associated (the first defect information is associated with the first identification information M (or even the second identification information N), and the second defect information is associated with the second identification information N). . Also, for example, by reading the second identification information N, the correlation between the second defect information memorized in the sixth steps S8 and S12 and the second identification information N, and the first defect memorized in the seventh step S9 are used. The association of the information with the second identification information N can avoid the defective positions produced in the state of the first long optical film F1 and the defective positions produced in the state of the long optical laminated body F2, thereby punching out the product.

However, the inspection method of the present invention is not limited to the form in which the first identification information M is printed by inkjet printing and the second identification information N is printed by laser marking. Either one of the first identification information M and the second identification information N is printed by inkjet printing, and the other is printed by laser engraving, or any one of the first identification information M and the second identification information N is printed by inkjet printing using transparent ink. One, and the other is printed by an inkjet method using colored ink, so that the first identification information M and the second identification information N can be distinguished and read.

Furthermore, as a preferred form, the inspection method of this embodiment may also include an eighth step (not shown in FIG. 1 ), which step is based on the first identification information M of the first long optical film F1 (even the long strip The correlation between the second identification information N) of the optical laminated body F2 and the first defect information, and the correlation between the second identification information N and the second defect information of the long optical laminated body F2, at the defect position of the long optical laminated body F2 Callout mark. Specifically, the second identification information N can also be read, and a mark can be placed on the defect position included in the first defect information and the second defect information by inkjet method, or the same mark as described in Patent Document 1 can be used. Ink callout markers. By including the eighth step of marking, marking is placed on the defect location, so the location of the defect can also be specified visually.

FIG. 7 is a diagram showing a printing example of the first identification information M and the second identification information N in the inspection method of this embodiment. The example shown in Figure 7 is a long optical laminated body (polarizing film) F2 in which a protective film made of triacetyl cellulose (TAC) and a protective film made of an acrylic resin are used as the first long optical film F1. The polarizing element as the second elongated optical film is formed by laminating the first elongated optical films F1 on both sides. In the example shown in Figure 7, after the first identification information M is printed on an acrylic resin protective film by an inkjet method using transparent ink (UV ink), the acrylic resin protective film and the TAC protective film are They are bonded to both sides of the polarizing element respectively, and then the second identification information N is printed on the TAC protective film side by laser marking. The circular unevenness shown in Figure 7 is a knurled portion formed on the widthwise end of the acrylic resin protective film, and the diamond-shaped unevenness is a knurled portion formed on the widthwise end of the TAC protective film. In addition, the photographed image shown in FIG. 7 shows the UV illumination 91 provided in the first reading device 9 and the illumination 101 provided in the second reading device 10 used simultaneously to illuminate the long optical laminated body F2 The photographed image obtained during the situation.

FIG. 8 shows an example of the result of reading the first identification information M of the long optical laminated body F2 shown in FIG. 7 by the first reading device 9 . As shown in FIG. 8 , it can be seen that in the captured image acquired by the first reading device 9 , the pixel area corresponding to the first identification information M becomes brighter (the pixel area corresponding to the second identification information N is the same as the background). darkens), so that the first identification information M and the second identification information N can be distinguished and read.

FIG. 9 shows an example of the result of reading the second identification information N of the long optical laminated body F2 shown in FIG. 7 by the second reading device 10 . As shown in FIG. 9 , it can be seen that in the captured image acquired by the second reading device 10 , the pixel area corresponding to the second identification information N becomes dark (the pixel area corresponding to the first identification information M is the same as the background). becomes bright), so that the second identification information N and the first identification information M can be distinguished and read.

Furthermore, in this embodiment, after the knurl processing step S1 is performed (after the knurl processing portion is formed on the first long optical film F1), the first identification information M is printed on the first long optical film F1 in the second step S2. An example of the strip optical film F1 has been described, but the present invention is not limited to this. The first identification information M may also be printed on the location where the knurled portion is intended to be formed before the knurled portion is formed (that is, the knurled portion is formed after the first identification information M is printed).

Furthermore, in this embodiment, the case where the elongated optical laminated body F2 is inspected a plurality of times has been described as an example. However, the present invention is not limited to this, and the inspection of the elongated optical laminated body F2 may be performed only once. In this case, the reading step S10, the fourth step (second time) S11, and the sixth step (second time) S12 shown in FIG. 1 are not required. However, when the product is punched while avoiding the defective position produced in the state of the first elongated optical film F1 and the defective position produced in the elongated optical laminate F2, or when the elongated optical laminate is executed In the case of step 8 of marking the defect position of body F2, step S10 needs to be read.

Furthermore, in this embodiment, the case where the inspection of the first elongated optical film F1 is performed only once has been described as an example. However, the present invention is not limited to this, and the inspection of the elongated laminated body F2 can also be performed in the same manner. Plural times. In this case, in the second and subsequent inspections, it is necessary to repeat the reading step of reading the first identification information M after the third step S4 shown in Figure 1, and obtain the first identification information M in the same way as the first step S2. The defect information step, and the step of associating the first defect information with the first identification information M and memorizing them similarly to the third step S4.

Moreover, in this embodiment, the case where the 1st defect information and the 2nd defect information are collectively managed based on the 2nd identification information N of the long optical laminated body F2 was demonstrated as an example by executing the 7th step S9. However, The present invention is not limited to this. Alternatively, the seventh step S9 may not be executed, but the first defect information may be managed based on the first identification information M, and the second defect information may be managed based on the second identification information N. Specifically, for example, the first long optical film F1 can be avoided by reading the first identification information M and using the correlation between the first defect information memorized in the third step S4 and the first identification information M. When punching products at defective locations generated under such conditions, the second identification information N can also be read and the association between the second defect information memorized in step S8 and the second identification information N can be used to avoid the problem. The product is punched out at the defective position produced in the long optical laminated body F2.

Moreover, in this embodiment, the case where the 1st elongated optical film F1 is a protective film, the 2nd elongated optical film is a polarizing element, and the elongated optical laminated body F2 is a polarizing film is demonstrated as an example, However, this invention does not apply. It is not limited to this. For example, the first elongated optical film F1 may also be a retardation film, and the second elongated optical film may also be a polarizing element. In addition, the first long optical film F1 may be a conductive film such as a retardation film, a reflective polarizing element, an anti-reflection film, an ITO (Indium Tin Oxides) film, or may be made of, for example, polyimide. Window film, etc., the second long optical film may also be a polarizing film (a laminate of a polarizing element and a protective film).

1: 1st inspection device 1a:Camera mechanism 1b:Image processing mechanism 2: 1st printing device 3: Rangefinder 4: The first operation memory device 5: Second inspection device 5a:Camera mechanism 5b:Image processing mechanism 6: 2nd printing device 7: Rangefinder 8: Second operation memory device 9: First reading device 10: 2nd reading device 11: Rangefinder 12: Second reading device 13: Second inspection device 13a:Camera mechanism 13b:Image processing mechanism 14:Range finder 91:UV lighting 92:Camera mechanism 100: Check system 101:Lighting 102:Camera mechanism D1: Defect D2: Defects F1: The first long optical film F2: Long optical laminate M: First identification information M1, M2, M3: first identification information N: Second identification information N1, N2, N3: second identification information R: Transport reel

FIG. 1 is a flowchart showing the schematic steps of an inspection method for a long optical laminated body according to one embodiment of the present invention. FIG. 2 is a perspective view schematically showing the schematic configuration of the inspection system for executing the first step S2 to the third step S4 shown in FIG. 1 . FIG. 3 is a perspective view schematically showing the schematic configuration of the inspection system for executing the fourth step S6 to the sixth step S8 shown in FIG. 1 . FIG. 4 is a perspective view schematically showing the schematic configuration of the inspection system for executing the seventh step S9 shown in FIG. 1 . 5(a) and (b) are side views schematically showing an example of the schematic configuration of the first reading device 9 and the second reading device 10 shown in FIG. 4 (from the width direction of the long optical laminated body F2 Observation side view). FIG. 6 schematically shows an inspection system for executing the reading step S10, the second fourth step S11, and the sixth step S12 (the fourth step and the sixth step after executing the seventh step S9) shown in FIG. 1 A schematic three-dimensional view of the structure. FIG. 7 is a diagram showing a printing example of the first identification information M and the second identification information N in the inspection method of the long optical laminated body according to one embodiment of the present invention. FIG. 8 shows an example of the result of reading the first identification information M of the long optical laminated body F2 shown in FIG. 7 using the first reading device 9 . FIG. 9 shows an example of a result obtained by using the second reading device 10 to read the second identification information N of the long optical laminated body F2 shown in FIG. 7 .

Claims (10)

An inspection method for long optical laminated bodies, which is characterized by including: The first step is to inspect the first long optical film to obtain the defect information of the first long optical film, that is, the first defect information; The second step is to print the first identification information on the width direction ends of the above-mentioned first elongated optical film at specific intervals in the longitudinal direction of the above-mentioned first elongated optical film; The third step is to associate and memorize the first defect information of the first long optical film with the first identification information; The fourth step is to inspect the long optical laminated body formed by laminating the above-mentioned first long optical film and the second long optical film, and obtain the defect information of the above-mentioned long optical laminated body, that is, the second defect information; The fifth step is to print the second identification information on the width direction ends of the above-mentioned long optical laminated body at specific intervals in the longitudinal direction of the above-mentioned long optical laminated body; The sixth step is to associate and memorize the second defect information of the long optical laminated body with the second identification information; For the above-mentioned first identification information to be printed in the above-mentioned step 2 and the above-mentioned second identification information to be printed in the above-mentioned step 5, any one of them is printed by inkjet and laser engraving. Print the other; alternatively, print either by inkjet using clear ink and the other by inkjet using colored ink. The inspection method of the long optical laminated body as claimed in claim 1, wherein In the above-mentioned second step, the above-mentioned first identification information is printed by inkjet using transparent ink, In the above-mentioned fifth step, the above-mentioned second identification information is printed by laser marking. For example, the inspection method of the long optical laminated body of claim 1 or 2 further includes step 7, The above-mentioned seventh step is to associate and memorize the first defect information of the above-mentioned first long optical film and the above-mentioned second identification information of the above-mentioned long optical laminated body. For example, the inspection method of the long optical laminated body of claim 1 or 2 further includes step 8, The above-mentioned step 8 is based on the above-mentioned first identification information and the above-mentioned first defect information of the above-mentioned first long optical film, and the above-mentioned second identification information and the above-mentioned second defect information of the above-mentioned long optical laminate, in the above-mentioned long optical film Mark the defective locations of the laminate. For example, the inspection method of the long optical laminated body of claim 1 or 2, wherein The above-mentioned first long optical film is a protective film. The above-mentioned second long optical film is a polarizing element. The long optical laminated body is a polarizing film. For example, the inspection method of the long optical laminated body of claim 1 or 2, wherein The above-mentioned first long optical film is a retardation film. The above-mentioned second long optical film is a polarizing film. For example, the inspection method of the long optical laminated body of claim 1 or 2, wherein The above-mentioned first long optical film is a reflective polarizing element. The above-mentioned second long optical film is a polarizing film. For example, the inspection method of the long optical laminated body of claim 5, wherein A knurled portion is formed on the end portion of the first elongated optical film in the width direction, In the above-mentioned second step, the above-mentioned first identification information is printed on the above-mentioned first elongated optical film at a position corresponding to the above-mentioned knurled processing part by an inkjet method. For example, the inspection method of the long optical laminated body of claim 5, wherein A knurled portion is formed on the end portion of the first elongated optical film in the width direction, In the above-mentioned fifth step, the above-mentioned second identification information is printed on the portion of the above-mentioned first elongated optical film located on the inside of the width direction of the above-mentioned elongated optical laminate relative to the knurled portion. An inspection system for long optical laminated bodies, which is characterized by: a first inspection device that inspects the first long optical film to obtain the defect information of the first long optical film, that is, the first defect information; A first printing device that prints the first identification information on the width direction ends of the above-mentioned first elongated optical film at specific intervals in the longitudinal direction of the above-mentioned first elongated optical film; a first operational memory device that associates and memorizes the first defect information of the first long optical film with the first identification information; a second inspection device that inspects the long optical laminated body formed by laminating the above-mentioned first long optical film and the second long optical film, and obtains the defect information of the above-mentioned long optical laminated body, that is, the second defect information; a second printing device that prints the second identification information on the width direction ends of the above-mentioned long optical laminated body at specific intervals in the longitudinal direction of the above-mentioned long optical laminated body; a second operational memory device that associates and memorizes the second defect information of the long optical laminated body with the second identification information; For the above-mentioned first identification information to be printed by the above-mentioned first printing device and the above-mentioned second identification information to be printed by the above-mentioned second printing device, any one of them is printed by an inkjet method, and by Print the other by laser marking; or, print either by inkjet printing using clear ink and the other by inkjet printing using colored ink.