WO2016132904A1 - Method for producing multilayer optical film and method for manufacturing liquid crystal panel - Google Patents

Method for producing multilayer optical film and method for manufacturing liquid crystal panel Download PDF

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Publication number
WO2016132904A1
WO2016132904A1 PCT/JP2016/053205 JP2016053205W WO2016132904A1 WO 2016132904 A1 WO2016132904 A1 WO 2016132904A1 JP 2016053205 W JP2016053205 W JP 2016053205W WO 2016132904 A1 WO2016132904 A1 WO 2016132904A1
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WO
WIPO (PCT)
Prior art keywords
film
laminated
optical
optical film
curl
Prior art date
Application number
PCT/JP2016/053205
Other languages
French (fr)
Japanese (ja)
Inventor
寛文 井上
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to CN201680003745.0A priority Critical patent/CN107000325B/en
Priority to KR1020187014780A priority patent/KR102289797B1/en
Priority to KR1020177013930A priority patent/KR101864095B1/en
Publication of WO2016132904A1 publication Critical patent/WO2016132904A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00—Optical elements

Definitions

  • the present invention relates to a method for producing a laminated optical film and a method for producing a liquid crystal panel.
  • This film laminating apparatus is a pair of laminating optical films composed of a pair of laminating rollers for sandwiching and laminating a plurality of optical films, and a plurality of optical films bonded by a pair of laminating rollers. And a guide portion that leads in a direction inclined by a set angle with respect to a tangent line passing through the contact point of the roller.
  • a laminated optical film can be obtained by bonding a plurality of optical films with a pair of bonding rollers. Furthermore, in a film bonding apparatus, a curl (warp) can be imparted in one direction in the laminated optical film by adjusting the set angle. Thus, in the laminated optical film provided with the curl in one direction, for example, when the laminated optical film is bonded to another member, the bonding becomes easy.
  • the laminated optical film includes a first optical film having a first optical axis and a second optical film having a second optical axis
  • first optical film and the second optical film must be fed into a pair of laminating rollers of the film laminating apparatus so that the first optical axis and the second optical axis form a predetermined angle.
  • the present invention has two optical films each having an optical axis, and a method for producing a laminated optical film capable of producing a laminated optical film provided with a desired curl, and a method for producing a liquid crystal panel including the laminated optical film
  • the main purpose is to provide
  • the method for producing a laminated optical film according to one aspect of the present invention is a method in which a plurality of films are laminated together with a plurality of films sandwiched therebetween.
  • a laminated optical film in which a second optical film having a second optical axis is bonded to a first optical film having a first optical axis is manufactured using a bonding apparatus that imparts curl to the laminated film in a predetermined direction.
  • the first optical film and the curl adjusting film are laminated as a plurality of films so as to relieve the curl generated in the first optical film due to the curl in a predetermined direction given by the film laminating apparatus.
  • a curl adjusting step for obtaining a first laminated film by pasting with a combination device, a first laminated film and a second optical film obtained in the curl adjusting step As a plurality of films, a laminating step of obtaining a laminated optical film as a second laminated film by laminating with a film laminating apparatus so that the first optical axis and the second optical axis form a predetermined angle; Is provided.
  • the curling of the first optical film is eased by bonding the curl adjusting film and the first optical film with a film bonding apparatus. And the 1st laminated film obtained by a curl adjustment process and the 2nd optical film are pasted together, and the laminated optical film as the 2nd laminated film is obtained. Since the curl of the first optical film is relaxed in the first laminated film, the direction of the curl generated in the laminated optical film can be the direction of the curl applied by the film laminating apparatus. That is, in the manufacturing method described above, a laminated optical film to which a desired curl is imparted while bonding the first optical film and the second optical film so that the first optical axis and the second optical axis form a predetermined angle. It can be manufactured.
  • the method for producing a laminated optical film according to another aspect of the present invention sandwiches and laminates a plurality of films, and a plurality of films are laminated.
  • the bonding step In order to relieve the curling in the direction other than the predetermined direction applied to the laminated optical film in the bonding step by the bonding step to obtain the laminated optical film and the curl in the predetermined direction applied by the film bonding apparatus. It comprises a curl adjusting step to be bonded by the film bonding apparatus and an optical film and Karl adjusting film as a plurality of films, a.
  • the laminated optical film which bonded the 1st optical film and the 2nd optical film in the bonding process is obtained.
  • the curl adjustment process alleviates curl in directions other than the predetermined direction applied to the laminated optical film in the bonding process.
  • the laminated optical film after the bonding step has the first direction together with the curl in a predetermined direction given by the film bonding apparatus.
  • the curl which any one of an optical film and a 2nd optical film has may be contained. Even in such a case, curling in a direction other than the predetermined direction given from the laminated optical film by the film laminating apparatus can be eased by providing the curl adjusting step.
  • multilayer optical film to which the desired curl was provided bonding a 1st optical film and a 2nd optical film so that a 1st optical axis and a 2nd optical axis may make a predetermined angle. It can be manufactured.
  • the first optical film is a polarizing film having an absorption axis as a first optical axis
  • the polarizing film is laminated on the film main body having the absorption axis and protects the film main body. You may have a surface protection film.
  • the laminated optical film since the laminated optical film has a polarizing film, it can be applied to, for example, a liquid crystal panel.
  • the method further includes a peeling step for peeling off the surface protective film of the polarizing film that is the first optical film before the curl adjusting step.
  • the surface protective film is peeled off.
  • a curl adjusting film may be bonded to the first optical film.
  • the stress in the polarizing film tends to be relaxed by peeling off the surface protective film. Therefore, it is easy to adjust the curl in the curl adjustment process.
  • the second optical film may be a retardation film having a slow axis as the second optical axis.
  • the laminated optical film since the laminated optical film has a polarizing film and a retardation film, it can be applied to, for example, a liquid crystal panel. And since optical compensation is possible with a phase difference film, the image quality displayed on a liquid crystal panel is easy to improve.
  • the curl adjusting film may be bonded to the surface of the first optical film opposite to the surface on which the second optical film is to be bonded.
  • the film laminating apparatus includes a pair of laminating rollers for laminating and laminating a plurality of films, and a pair of laminated films composed of a plurality of films bonded by a pair of laminating rollers.
  • a laminated film is obtained by laminating with a plurality of films with a pair of laminating rollers. And since the guide part is provided as described above, the laminated film is discharged from the pair of bonding rollers in a direction inclined by a set angle with respect to the plane including the axis of the pair of bonding rollers. . Therefore, the laminated film is stretched over one of the pair of bonding rollers. As a result, curling in a predetermined direction can be imparted to the laminated film.
  • a method for producing a liquid crystal panel wherein the first optical film having the first optical axis and the second optical axis having the second optical axis are produced by the method for producing the first or second laminated optical film.
  • the laminated optical film manufacturing process which manufactures the laminated optical film with which the film was bonded, and the bonding process which bonds a laminated optical film to a liquid crystal cell are equipped, and a 1st optical film absorbs as a 1st optical axis.
  • the laminated optical film is produced by the first or second laminated optical film production method, the curl faces the desired direction. Therefore, it is easy to bond the laminated optical film to the liquid crystal cell. As a result, the liquid crystal panel can be manufactured efficiently.
  • the second optical film may be a retardation film having a slow axis as the second optical axis.
  • the optical compensation can be performed in the liquid crystal panel, the image quality of the image displayed on the liquid crystal panel can be improved.
  • Another aspect of the present invention uses a film laminating apparatus that clamps and laminates a plurality of films and applies a curl to a laminated film in which a plurality of films are bonded in a predetermined direction.
  • the present invention also relates to a method for producing a laminated optical film, in which the laminated optical film is obtained by bonding a film and a curl adjusting film as the plurality of films with a film bonding apparatus.
  • the curl adjusting film and the optical film are used to relax the curl generated in the optical film having the optical axis by curling in a predetermined direction applied by the film laminating apparatus. Is pasted. Thereby, a laminated optical film of the optical film in a state where the curl is relaxed and the curl adjusting film is obtained.
  • two optical films each having an optical axis and a method for producing a laminated optical film capable of producing a laminated optical film having a desired curl and a method for producing a liquid crystal panel including the laminated optical film.
  • Drawing 1 is a mimetic diagram showing the composition of the lamination polarizing film as an example of the lamination optical film manufactured with the manufacturing method of the lamination optical film concerning one embodiment.
  • FIG. 2 is a schematic exploded perspective view of the laminated polarizing film shown in FIG.
  • FIG. 3 is a view showing an example of a curled state of the laminated polarizing film shown in FIG.
  • FIG. 4 is a drawing for explaining a film bonding apparatus used in the method for producing a laminated optical film according to an embodiment. It is a typical perspective view of the polarizing film as a 1st optical film used with the manufacturing method of the lamination
  • Drawing 6 (a) is a figure for explaining the curl adjustment process in the manufacturing method of the lamination optical film concerning one embodiment.
  • FIG.6 (b) is drawing for demonstrating the feeding state to a pair of bonding roller of the polarizing film which is an example of a 1st optical film.
  • FIG. 7 is a drawing schematically showing the principle of curl adjustment in the curl adjustment step.
  • Fig.8 (a) is drawing for demonstrating the bonding process in the manufacturing method of the laminated optical film which concerns on one Embodiment.
  • FIG.8 (b) is drawing for demonstrating the feeding state to a pair of bonding roller of the polarizing film which is an example of a 1st laminated
  • FIG.9 (a) is drawing for demonstrating the bonding process in the manufacturing method of the laminated optical film which concerns on other embodiment.
  • FIG.9 (b) is drawing for demonstrating the feeding state to a pair of bonding roller of the polarizing film which is an example of a 1st optical film.
  • FIG. 10A is a drawing for explaining a curl adjusting step in the method for manufacturing a laminated optical film according to another embodiment.
  • FIG.10 (b) is drawing for demonstrating the feeding state to a pair of bonding roller of the laminated polarizing film which is an example of a laminated optical film.
  • FIG. 11 is a drawing schematically showing a configuration of a liquid crystal panel manufactured by a method for manufacturing a liquid crystal panel according to an embodiment.
  • a laminated polarizing film (laminated optical film) 1 produced by the method for producing a laminated polarizing film according to the first embodiment, as schematically shown in FIG. 1, a polarizing film (first optical film) 10, A retardation film (second optical film) 20 and an optical film in which they are laminated.
  • the laminated polarizing film 1 is an optical component that is bonded to, for example, a liquid crystal cell.
  • the polarizing film 10 is a film body 11 including a polarizer layer 11a and protective film layers 11b and 11c laminated on both sides of the polarizer layer 11a, and a surface protection that is peelably bonded to the surface of the film body 11. And a film 12.
  • the polarizer layer 11a is a layer having linear polarization characteristics that selectively transmits light oscillating in a predetermined direction, and is composed of a resin film that is uniaxially stretched and has a dichroic dye adsorbed and oriented in the stretch direction.
  • the example of the resin film which the polarizer layer 11a has is a polyvinyl alcohol (hereinafter also referred to as “PVA”) resin film, and the example of the PVA resin film is a PVA film.
  • PVA polyvinyl alcohol
  • dichroic dyes are iodine and dichroic organic dyes.
  • An example of the thickness of the polarizer layer 11a is 1 ⁇ m to 30 ⁇ m.
  • the protective film layers 11b and 11c are made of a resin film.
  • the example of the resin film which comprises the protective film layers 11b and 11c is a triacetyl cellulose (henceforth "TAC") type
  • An example of the thickness of the protective film layers 11b and 11c is 10 ⁇ m to 200 ⁇ m.
  • the protective film layers 11b and 11c are usually laminated on the polarizer layer 11a via an adhesive layer.
  • the polarizing film 10 is not limited to the form in which the protective film layers 11b and 11c are laminated on the polarizer layer 11a, and the protective film layer (for example, the protective film layer 11b) is provided on one of both surfaces of the polarizer layer 11a. What is necessary is just to be laminated
  • the surface protective film (or protective film) 12 is detachably bonded on the protective film layer 11b.
  • An example of the thickness of the surface protective film 12 is 30 ⁇ m to 100 ⁇ m.
  • Examples of the material of the surface protection film 12 include polyethylene, polypropylene, and polyester.
  • the surface protective film 12 included in the laminated polarizing film 1 produced by the method for producing a laminated polarizing film according to an embodiment is a film that functions as a curl adjusting film in the production stage of the laminated polarizing film 1.
  • the surface protective film 12 is a film that may be peeled off from the film body 11. That is, the surface protective film 12 is a transparent resin film that does not affect the optical characteristics of the laminated polarizing film 1.
  • the retardation film 20 is bonded onto the protective film layer 11c. More specifically, the retardation film 20 is bonded to the protective film layer 11c via an adhesive layer. This pressure-sensitive adhesive layer is usually provided on the protective film layer 11c in advance.
  • the retardation film 20 is a film for performing optical compensation when the laminated polarizing film 1 is applied to a liquid crystal panel, for example.
  • the retardation film 20 has a retardation layer 21 and an adhesive layer 22 laminated on the retardation layer 21. Examples of the retardation film 20 include a ⁇ / 2 plate and a ⁇ / 4 plate.
  • the retardation layer 21 is a layer having a function of generating a retardation by a refractive index difference.
  • the retardation layer 21 is, for example, a resin film, and examples of the resin film material include polycarbonate, polyethersulfone, cycloolefin polymer, and the like.
  • the retardation realized by the retardation layer 21 may be anything depending on the use of the laminated polarizing film 1.
  • An example of the thickness of the retardation layer 21 is 10 ⁇ m to 100 ⁇ m.
  • the pressure-sensitive adhesive layer 22 is a layer for bonding the laminated polarizing film 1 to another member such as a liquid crystal cell.
  • An example of the thickness of the pressure-sensitive adhesive layer 22 is 5 ⁇ m to 30 ⁇ m.
  • Examples of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 22 include an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, and a silicone pressure-sensitive adhesive.
  • a separate film 23 is provided on the pressure-sensitive adhesive layer 22 in order to prevent foreign matter from adhering to the pressure-sensitive adhesive layer 22.
  • the pressure-sensitive adhesive layer 22 to which the separate film 23 is bonded is laminated on the retardation layer 21. Therefore, the pressure-sensitive adhesive layer 22 to which the separate film 23 is bonded is also referred to as a pressure-sensitive adhesive layer 24 with a separate film.
  • the material of the separate film 23 include polyethylene terephthalate (PET) and polyethylene.
  • PET polyethylene terephthalate
  • An example of the thickness of the separate film 23 is 30 ⁇ m to 100 ⁇ m.
  • the separate film 23 is peeled off before the laminated polarizing film 1 is bonded to a liquid crystal cell or the like. Therefore, hereinafter, the retardation film 20 from which the separate film 23 has been peeled is also referred to as a retardation film 20A, and the laminated polarizing film 1 including the retardation film 20A is also referred to as a laminated polarizing film 1A.
  • the absorption axis of the polarizing film 10 (first optical axis) and S A, the optical axis of the retardation film 20 (the 2 optical axes) SD are laminated so as to form a predetermined angle ⁇ such that the laminated polarizing film 1 as a product exhibits the required performance.
  • the absorption axis S A indicated by a broken line on the retardation film 20 is an absorption axis S obtained by projecting the absorption axis S A of the polarizing film 10 onto the retardation film 20 in order to explain the predetermined angle ⁇ .
  • the optical axis SD of the retardation film 20 is a slow axis or a fast axis. In the following description, unless otherwise specified, the optical axis SD of the retardation film 20 is referred to as a slow axis SD .
  • Forming a predetermined angle with the absorption axis S A and the slow axis S D theta may be any angle in accordance with the lamination of the polarizing film 1 application as a product. Examples of the predetermined angle ⁇ include 0 ° and 90 °.
  • Absorption axis S A of the polarizing film 10 is a method for producing a polarizing film 10, and is imparted by uniaxially stretching a resin film to be a polarizer layer 11a.
  • the slow axis SD of the retardation film 20 is given by uniaxially or biaxially stretching a resin film to be the retardation layer 21 in the process of producing the retardation film 20.
  • Stretching method for imparting an axis indicating the optical characteristics as the absorption axis S A and the slow axis S D may be any of dry and wet stretching method.
  • the laminated polarizing film 1 is provided with curl (warpage) as shown in FIG.
  • a liquid crystal cell 30 that is an example of an adhesion target is schematically illustrated.
  • the laminated polarizing film 1 ⁇ / b> A including the retardation film 20 ⁇ / b> A from which the surface protective film 12 has been peeled is illustrated as the laminated polarizing film 1 when being bonded to the liquid crystal cell 30.
  • FIG. 3 illustrates a state in which the laminated polarizing film 1 is curled in the short direction as the predetermined direction in the laminated polarizing film 1 (1A) having a rectangular shape in plan view.
  • the direction of curling applied to the laminated polarizing film 1 may be the longitudinal direction.
  • the adhesive layer 22 has a curl (positive curl) that protrudes toward the liquid crystal cell 30 side. ) Is applied to the laminated polarizing film 1 (1A).
  • the curl imparted to the laminated polarizing film 1 may be a reverse curl curved to the opposite side of the normal curl.
  • the laminated polarizing film 1 provided with curl is manufactured by laminating the polarizing film 10 and the retardation film 20 using the film laminating apparatus 40 schematically shown in FIG.
  • the film body 11 of the polarizing film 10 and the retardation layer 21 of the retardation film 20 are usually laminated via an adhesive layer.
  • the pressure-sensitive adhesive layer is usually provided in advance on the film body 11 of the polarizing film 10, and the polarizing film 10 and the retardation film 20 are bonded using the polarizing film 10 provided with the pressure-sensitive adhesive layer in advance. Is done.
  • the film laminating apparatus 40 is an apparatus that applies a curl in a predetermined direction to a laminated film in which a plurality of films are bonded while sandwiching and laminating a plurality of films.
  • the film bonding apparatus 40 an apparatus disclosed in Japanese Patent Application Laid-Open No. 2003-11225 can be used.
  • FIG. 4 the form which bonds the two films F1 and F2 as a some film, and produces the laminated
  • the film bonding apparatus 40 illustrated in FIG. 4 will be described.
  • the film bonding apparatus 40 includes a pair of bonding rollers 41 ⁇ / b> A and 41 ⁇ / b> B that sandwich and bond the films F ⁇ b> 1 and F ⁇ b> 2 to produce a laminated film F ⁇ b> 3 and a laminated film F ⁇ b> 3.
  • a guide portion 42 that guides in a direction inclined by a set angle ⁇ with respect to a plane P1 including a tangent line passing through the contact points of the combined rollers 41A and 41B.
  • An example of the guide part 42 is an idle roller.
  • the guide part 42 guides the laminated film F3 in the direction of the set angle ⁇ with respect to the plane P2.
  • the laminated film F3 is discharged from the pair of bonding rollers 41A and 41B in the direction of the set angle ⁇ (or the set angle ⁇ with respect to the plane P2) from the pair of bonding rollers 41A and 41B.
  • the laminated film F3 is wound around one of the pair of bonding rollers 41A and 41B. Therefore, a laminated film F3 curled in a predetermined direction (conveying direction of the laminated film F3) is obtained.
  • the set angle ⁇ or set angle ⁇
  • the curl direction in the thickness direction of the laminated film F3 is adjusted together with the curl amount.
  • the “predetermined direction” of curling to be applied to the laminated film F3 is a direction in a plane orthogonal to the laminating direction of the films F1 and F2 when it is assumed that the laminated film F3 is not curled. Specifically, it is the conveyance direction of the laminated film F3.
  • the polarizing film 10 ⁇ / b> A is a film in which a surface protective film 13 is bonded to the film body 11.
  • the surface protective film included in the polarizing film 10 ⁇ / b> A is distinguished from the surface protective film 12 as the surface protective film 13.
  • the surface protective film 13 is the same film as the surface protective film 12. Therefore, the polarizing film 10 ⁇ / b> A is an optical film (first optical film) having the same layer configuration as the polarizing film 10.
  • the polarizing film 10A is a single-wafer (or sheet-like) polarizing film obtained by cutting out the polarizing film 10A from a raw roll of the polarizing film 10A to a predetermined size.
  • the size of the polarizing film 10 ⁇ / b> A may be the same as that of the laminated polarizing film 1, but is usually a size including a plurality of product sizes of the laminated polarizing film 1.
  • the plan view shape of the polarizing film 10A is rectangular, the direction of the absorption axis S A is the longitudinal direction.
  • a water-based adhesive or an ultraviolet curable adhesive is used for bonding of the polarizer layer 11a and the protective film layers 11b and 11c and bonding of the protective film layers 11b and 11c and the surface protective film 13. ing. Therefore, in the polarizing film 10A, curling tends to occur due to the influence of drying or curing of the adhesive or the difference in stress of each layer constituting the polarizing film 10A.
  • FIG. 5 for the sake of explanation, a form in which curling occurs in the longitudinal direction is illustrated as an example.
  • the surface protective film 13 is peeled from the polarizing film 10A (peeling step).
  • the sheet-like film body 11 from which the surface protective film 13 is peeled off from the polarizing film 10A is referred to as a polarizing film 10B.
  • a new surface protective film 12 as a curl adjusting film is bonded to the polarizing film 10B using the film bonding apparatus 40 so as to relieve the longitudinal curl generated in the polarizing film 10B.
  • Bonding of the polarizing film 10B and the surface protective film 12 may be performed by, for example, applying an adhesive having adhesiveness enough to peel them off to the interface between the polarizing film 10B and the curl adjusting film.
  • the surface protective film 12 is fed between the pair of bonding rollers 41A and 41B from the raw roll R1 of the surface protective film 12.
  • a pair of polarizing films 10B is arranged so that the direction of curl generated in the polarizing film 10B substantially coincides with the direction of curling that can be applied by the film laminating apparatus 40 (conveying direction of the surface protective film 12).
  • the film laminating apparatus 40 conveys direction of the surface protective film 12.
  • FIG. 6B Curling has occurred in the longitudinal direction of the polarizing film 10B. Therefore, as shown in FIG. 6B, the polarizing film 10B is paired with the pair of bonding rollers 41A and 41B so that the longitudinal direction of the polarizing film 10B coincides with the feeding direction to the pair of bonding rollers 41A and 41B. Transport to. FIG.6 (b) is the figure which looked at the film bonding apparatus 40 from the bonding roller 41A side in Fig.6 (a).
  • the curl that can be applied by the film laminating device 40 with the set angle ⁇ in the film laminating device 40 and the curl of the polarizing film 10A (curl C1 indicated by a solid line in FIG. 7) as shown in FIG. So that the curl amount is the same and the curl direction is opposite (curl C2 indicated by a broken line in FIG. 7) is applied to the polarizing film 10A.
  • the polarizing film 10 as the first laminated film in which the surface protective film 12 and the polarizing film 10B are bonded by bonding the surface protective film 12 and the polarizing film 10B with the film bonding apparatus 40. Is obtained in a state where the curl generated in the polarizing film 10B is canceled.
  • the surface protective film 12 has a belt shape because it is fed from the raw roll R1. Therefore, the surface protective film 12 on which the polarizing film 10B is discretely bonded in the longitudinal direction (the discharge direction of the pair of bonding rollers 41A and 41B) is discharged from the pair of bonding rollers 41A and 41B. Therefore, as shown in FIG. 6B, regions of the polarizing film 10 are discretely formed on the belt-shaped surface protective film 12 that has passed through the pair of bonding rollers 41A and 41B.
  • the polarizing film 10 formed discretely in the longitudinal direction of the band-shaped surface protective film 12 is cut out (laminated film cutting step).
  • a cutting blade may be used, or laser light may be used.
  • the polarizing film 10 and the phase difference film 20 are bonded using the film bonding apparatus 40 (bonding process).
  • an adhesive may be applied to the interface between the polarizing film 10 and the retardation film 20, and as described above, the polarizing film 10.
  • an adhesive layer may be provided in advance on the surface to be bonded to the retardation film 20.
  • the slow axis SD of the retardation film 20 and the absorption axis S A of the polarizing film 10 form a predetermined angle ⁇
  • the retardation layer 21 is opposite to the surface protective film 12 of the polarizing film 10.
  • the polarizing film 10 and the retardation film 20 are fed between the pair of bonding rollers 41A and 41B so that the film is bonded.
  • the retardation film 20 is fed to the pair of bonding rollers 41 ⁇ / b> A and 41 ⁇ / b> B while the retardation film 20 is fed out from the original roll R ⁇ b> 2 of the retardation film 20.
  • the direction of the slow axis SD of the retardation film 20 is the longitudinal direction of the strip-like retardation film 20 as shown in FIG. FIG.8 (b) is the figure which looked at the film bonding apparatus 40 from the bonding roller 41A side in Fig.8 (a).
  • the absorption axis S A is oriented in the longitudinal direction
  • the retardation film 20 the slow axis S D are oriented in the longitudinal direction of the retardation film 20. Therefore, when the predetermined angle ⁇ is 90 °, the polarizing film 10 is fed into the pair of bonding rollers 41A and 41B along the short direction as shown in FIG. 8B.
  • the set angle ⁇ in the film bonding apparatus 40 is a curl (for example, the pressure-sensitive adhesive layer 22 side) that is desired to be applied to the laminated polarizing film 1 as a product. It is set so as to give a convex curl.
  • the laminated polarizing film 1 as the second laminated film provided with a desired curl is obtained. Since the polarizing film 10A used for production is a sheet, the laminated polarizing film 1 is also a sheet.
  • the retardation film 20 fed into the pair of bonding rollers 41A and 41B has a belt shape. Therefore, from the pair of bonding rollers 41 ⁇ / b> A and 41 ⁇ / b> B, the retardation film 20 in which the polarizing film 10 is discretely bonded in the longitudinal direction of the strip-shaped retardation film 20 is discharged. Therefore, as shown in FIG. 8B, regions that are the laminated polarizing films 1 are discretely formed in the longitudinal direction of the retardation film 20 that has passed through the pair of bonding rollers 41A and 41B.
  • the chip-shaped laminated polarizing film 1 as a product is obtained by processing the sheet-shaped laminated polarizing film 1 manufactured as described above into a product size.
  • the region that is the laminated polarizing film 1 discretely formed in the longitudinal direction of the retardation film 20 may be directly processed, or after the region of the laminated polarizing film 1 is cut out once, The single-layer laminated polarizing film 1 may be further processed.
  • the processing method to the product size of the sheet-like laminated polarizing film 1 is, for example, cutting. A cutting process and a polishing process for polishing the end face may be appropriately combined.
  • the retardation film 20 is bonded to the polarizing film 10A in which the curl is not adjusted using the film bonding apparatus 40. If laminating the polarizing film 10A and the retardation film 20, they, and the absorption axis S A direction and the slow axis S D direction needs to align so as to form a predetermined angle theta. In other words, the lamination of the polarizing film 10A and the retardation film 20, there is a shaft angle limits the absorption axis S A and the slow axis S D. Due to this axial angle limitation, the feeding direction of the polarizing film 10A to the pair of bonding rollers 41A and 41B is limited.
  • the film bonding apparatus 40 only one direction (predetermined direction) can provide curl. Therefore, when curling in a direction different from the direction of curl that can be imparted by the film laminating apparatus 40 occurs in the polarizing film 10A due to the limitation of the axial angle in laminating the polarizing film 10A and the retardation film 20. A laminated polarizing film having curls in two different directions is produced. Thus, the laminated polarizing film having a plurality of directional curls rather than a unidirectional curl is difficult to bond to, for example, a liquid crystal cell.
  • the curling of the polarizing film 10A is not performed. It has a curl adjustment process to adjust.
  • the surface protective film 12 is bonded to the polarizing film 10 ⁇ / b> B as the film body 11. Since the surface protective film 12 is a film that does not have an axis that defines the optical characteristics, no axial angle limitation occurs in the bonding of the surface protective film 12 and the polarizing film 10B.
  • the polarizing film 10B is a curl generated in the polarizing film 10 ⁇ / b> B in a direction in which a curl in a direction different from a desired curl in the laminated polarizing film 1 can be canceled by the curl applied by the film bonding apparatus 40.
  • 10B can be fed into the pair of bonding rollers 41A and 41B.
  • the polarizing film 10 in which the curling of the polarizing film 10B is substantially canceled is obtained.
  • the retardation film 20 can be bonded to the polarizing film 10 having substantially no curl. Therefore, even if is prescribed feed direction of the polarizing film 10 with respect to the absorption axis S A direction of the polarizing film 10 can be appropriately curled desired direction relative to the laminated polarizing film 1. As a result, it is easy to bond the laminated polarizing film 1 to, for example, a liquid crystal cell.
  • the laminated polarizing film 1 is required to be thin, and accordingly, the polarizing film 10 is also required to be thin.
  • curl control is difficult in the manufacturing process of the polarizing film 10A to be the polarizing film 10, and the desired curling in the laminated polarizing film 1 can be achieved in bonding with the retardation film 20 under axial angle limitation. Different curls tend to occur in the polarizing film 10A.
  • the above-described manufacturing method can adjust the curl of the polarizing film 10A and manufacture the laminated polarizing film 1 provided with a desired curl. Therefore, in the manufacturing method described above, it is possible to easily manufacture a thinner laminated polarizing film 1 provided with a desired curl.
  • the surface protective film 13 of the polarizing film 10A is once peeled off as a pretreatment before the curling adjustment step for adjusting the curling of the polarizing film 10B.
  • the stress etc. in the polarizing film 10B are relieved by peeling off the surface protection film 13. Therefore, it is easy to adjust the curl of the polarizing film 10B in the curl adjusting step.
  • the surface protective film 12 Since the surface protective film 12 is bonded again in the curl adjusting step, the surface protective film is replaced with respect to the film body 11 through the peeling step and the curl adjusting step. Accordingly, the surface protective films 12 and 13 can be the same film as described above.
  • the laminated polarizing film 1 is manufactured using the sheet-like polarizing film 10A shown in FIG. Since the manufacturing method of the laminated polarizing film in the second embodiment is the same as the manufacturing method described with reference to FIGS. 5 to 8B except for the order of the bonding step and the curl adjustment step, The description will focus on the differences.
  • the polarizing film 10A and the retardation film 20 shown in FIG. 5 are fed into the film laminating apparatus 40, and the retardation film 20 and the polarizing film are fed. 10A is bonded and the laminated polarizing film 2 is obtained (bonding process).
  • the bonding process in 2nd Embodiment is the bonding demonstrated using Fig.8 (a) except the point which uses 10 A of polarizing films instead of the polarizing film 10 shown to Fig.8 (a). This is the same as the combined step.
  • the polarizing film 10A, the pair of lamination rollers 41A along the widthwise direction, fed to 41B depending on the axial angle limiting the absorption axis S A and the slow axis S D, the polarizing film 10A, the pair of lamination rollers 41A along the widthwise direction, fed to 41B.
  • the setting angle ⁇ in the film laminating apparatus 40 is a curl (for example, the pressure-sensitive adhesive layer 22 side is desired to be on the outer side) to be applied to the laminated polarizing film 1 as a product (Convex curl) is set.
  • the polarizing film 10A is curled in the longitudinal direction.
  • the film bonding apparatus 40 curl is provided in the conveyance direction of the polarizing film 10A, that is, the short direction.
  • the laminated polarizing film 2 is curled in two directions, that is, a curl in the short direction provided by the film laminating apparatus 40 and a curl in the longitudinal direction of the polarizing film 10A itself.
  • FIG.9 (b) is the figure which looked at the film bonding apparatus 40 from the bonding roller 41A side in Fig.9 (a).
  • the surface protective film 13 included in the polarizing film 10A included in the laminated polarizing film 2 is peeled off (peeling step).
  • FIG. 10A the laminated polarizing film 2 and the surface protective film 12 are bonded to a film bonding apparatus so as to cancel the curling of the laminated polarizing film 2 from which the surface protective film 13 has been peeled off. Bonding using 40 (curl adjustment step).
  • the curl adjusting step in the second embodiment is the same as that shown in FIGS. 6A and 6B except that the laminated polarizing film 2 is used instead of the polarizing film 10B shown in FIG. This is the same as the curl adjustment process described using FIG. Therefore, also in the curl adjustment process in the second embodiment, as shown in FIG. 10B, the laminated polarizing film 2 is fed into the pair of bonding rollers 41A and 41B along the longitudinal direction.
  • FIG.10 (b) is the figure which looked at the film bonding apparatus 40 from the bonding roller 41A side in Fig.10 (a).
  • the set angle ⁇ in the film bonding apparatus 40 has the same curl amount so that the curl of the polarizing film 10 ⁇ / b> A is canceled by the curl applied by the film bonding apparatus 40. And it sets so that the curl of a reverse direction may be provided to the laminated polarizing film 2.
  • the surface protective film 12 is bonded to the film body 11 corresponding to the polarizing film 10A from which the surface protective film 13 has been peeled off. Therefore, the laminated polarizing film 1 in which the polarizing film 10 is bonded to the retardation film 20 is obtained through the curl adjusting step.
  • the curl in the longitudinal direction that is not required for the laminated polarizing film 1 is canceled out of the curls in the short side direction and the longitudinal direction occurring in the laminated polarizing film 2. Therefore, the laminated polarizing film 1 to which the curl in the short direction as the desired curl is imparted is obtained through the curl adjusting step.
  • the laminated polarizing film 1 is manufactured using the sheet-like polarizing film 10A, in the film bonding apparatus 40, sheet-like lamination
  • stacking is carried out similarly to 1st Embodiment.
  • the polarizing film 1 is manufactured. Therefore, the chip-shaped laminated polarizing film 1 as a product is obtained by processing the sheet-shaped laminated polarizing film 1 into a product size.
  • the second embodiment is substantially the same as the first embodiment except that the curl adjustment step and the bonding step are different from the first embodiment. Therefore, the manufacturing method of the laminated polarizing film in the second embodiment also has at least the same effects as the manufacturing method of the laminated polarizing film in the first embodiment.
  • the laminated polarizing film 1 As a third embodiment, a method for manufacturing a liquid crystal panel using the laminated polarizing film 1 will be described.
  • the laminated polarizing film 1 having the layer configuration shown in FIG. 1 the laminated polarizing film 1 from which the separate film 23 is peeled is also referred to as a laminated polarizing film 1 ⁇ / b> A.
  • the laminated polarizing film 1 (1 ⁇ / b> A) is bonded to one main surface of the liquid crystal cell 30, and the polarizing film 50 is bonded to the other main surface. Combined and configured.
  • the side to which the laminated polarizing film 1 is bonded is the user side, and the polarizing film 50 side is the surface light source side.
  • the liquid crystal cell 30 only needs to be used for a known liquid crystal panel.
  • the liquid crystal cell 30 may be a glass substrate in which a transparent electrode, an alignment film, a liquid crystal, an alignment film, a transparent electrode, a color filter, and a glass substrate are sequentially provided.
  • the polarizing film 50 is a polarizing film in which an adhesive layer 51 is laminated on the polarizing film 10A.
  • the liquid crystal panel 3 is manufactured as follows, for example. First, the laminated polarizing film 1 is produced by the production method of the laminated polarizing film described in the first or second embodiment (laminated polarizing film production process).
  • the laminated polarizing film 1 is bonded to one main surface of the liquid crystal cell 30, and the polarizing film 50 is bonded to the other main surface to obtain the liquid crystal panel 3 (laminated polarizing film bonding step).
  • the laminated polarizing film laminating step laminated optical film laminating step
  • the laminated polarizing film 1A obtained by peeling the separate film 23 from the laminated polarizing film 1 is bonded to the liquid crystal cell 30 via the adhesive layer 22.
  • the polarizing film 50 is bonded to the liquid crystal cell 30 via the pressure-sensitive adhesive layer 51 of the polarizing film 50.
  • the laminated polarizing film 1 and the polarizing film 50 are bonded to the liquid crystal cell 30 so that the polarizing film 10 in the laminated polarizing film 1 and the polarizing film 50 are in a crossed Nicols state.
  • the laminated polarizing film 1 included in the liquid crystal panel 3 is manufactured by the manufacturing method exemplified in the first or second embodiment. Therefore, the laminated polarizing film 1 is given a desired curl. Thereby, the laminated polarizing film 1 to the liquid crystal cell 30 is easy. Therefore, it is easy to manufacture the liquid crystal panel 3 efficiently.
  • a polarizing film was exemplified as the first optical film, and a retardation film was exemplified as the second optical film.
  • the first and second optical films may be optical films each having an optical axis.
  • the second optical film may be a brightness enhancement film.
  • the brightness enhancement film include 3M DBEF (registered trademark) and 3M APF which reflect predetermined polarized light.
  • the brightness enhancement film is, for example, an optical film that transmits polarized light parallel to the optical axis (transmission axis) and reflects polarized light orthogonal to the optical axis (transmission axis).
  • the first optical film is a polarizing film
  • the second optical film is a brightness enhancement film
  • the brightness enhancement film has an optical axis (transmission axis) of the brightness enhancement film and an absorption axis of the polarization film orthogonal to each other. And bonded to the polarizing film.
  • the polarizing film side is bonded to a liquid crystal cell. Therefore, in the laminated polarizing film in which the polarizing film and the brightness enhancement film are laminated, the pressure-sensitive adhesive layer 22 only needs to be provided on the polarizing film side.
  • the polarizing film 50 is bonded to the side opposite to the laminated polarizing film 1 (1A) side.
  • it is a laminated polarizing film in which the polarizing film and the brightness enhancement film described above are laminated, and the laminated polarizing film manufactured in the first and second embodiments is replaced by the liquid crystal cell 30 instead of the polarizing film 50. It may be pasted.
  • the liquid crystal panel is disposed with respect to the surface light source so that the laminated polarizing film in which the polarizing film and the brightness enhancement film are laminated is positioned on the surface light source side. .
  • the curl adjusting film As the curl adjusting film, the surface protective film of the polarizing film as a product is exemplified, but the curl adjusting film is not particularly limited as long as it is provided on the laminated optical film so as to be peelable. This is because if the curl adjusting film is peeled off before the laminated optical film is used as an optical component, the optical characteristics of the laminated optical film are not affected. Accordingly, the curl adjusting film may be a film having an optical axis or a film having no optical axis.
  • the curl adjusting film is a transparent resin film as a surface protective film of the polarizing film
  • a known method can be applied as it is to the inspection of the laminated polarizing film 1.
  • Direction of absorption axis S A in the polarization film 10A shown in FIG. 5 is not limited in the longitudinal direction of the polarizing film 10A.
  • the direction of the absorption axis of the strip-shaped polarizing film drawn out from the raw roll is substantially directed to the longitudinal direction of the strip-shaped polarizing film.
  • a constant angle to the longitudinal direction as the reference direction is the polarizing film 10A of the absorption axis S A (e.g., A polarizing film 10A inclined by 45 °, 60 °, etc. can be obtained.
  • the direction of the slow axis SD of the retardation film 20 is not limited to the longitudinal direction of the strip-like retardation film 20.
  • a retardation film 20 having a slow axis SD inclined with respect to the longitudinal direction is obtained.
  • the first optical film a polarizing film including a surface protective film is exemplified, but for example, the film main body 11 shown in FIG. 1 may be the first optical film.
  • the first optical film is a polarizing film alone.
  • the first optical film may be a so-called elliptically polarizing plate in which a polarizing film and a retardation film are laminated.
  • the first optical axis of the first optical film may be the absorption axis of the polarizing film constituting the first optical film, or the slow axis of the retardation film constituting the first optical film. Also good.
  • the elliptically polarizing plate as the first optical film can be manufactured, for example, by the method for manufacturing a laminated polarizing film described in the first embodiment.
  • the absorption axis of the polarizing film is the first optical axis
  • the slow axis of the retardation film is the second optical axis.
  • the axis orthogonal to the absorption axis may be the first optical axis
  • the axis orthogonal to the slow axis of the retardation film may be the second optical axis.
  • an optical film having an optical axis (in FIG. The optical film and the curl adjusting film (other film) are bonded so that the curl generated in the film 10B) is relieved.
  • an optical film having an optical axis and a laminated optical film obtained by laminating a curl adjusting film that is another film, and curling that has occurred in the optical film before laminating is relaxed Laminated optical films can be manufactured.
  • the laminated optical film and another optical film having an optical axis can be further combined.
  • SYMBOLS 1 Laminated polarizing film, 2 ... Laminated polarizing film, 3 ... Liquid crystal panel, 10, 10A, 10B ... Polarizing film, 11 ... Film main body, 11a ... Polarizer layer, 11b, 11c ... Protective film layer, 12 ... Surface protective film (Curling adjustment film), 13 ... surface protective film, 20 ... retardation film (second optical film), 30 ... liquid crystal cell, 40 ... film laminating apparatus, 41A, 41B ... a pair of laminating rollers, 42 ... guide Part, S A ... absorption axis (first optical axis), S D ... slow axis (second optical axis).

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Abstract

A method for producing a multilayer optical film according to one embodiment of the present invention is a method for producing a multilayer optical film 1 wherein a second optical film 20 is bonded to a first optical film 10. This method for producing a multilayer optical film 1 comprises: a curl adjustment step wherein a film for curl adjustment 12 is bonded to the first optical film by a film bonding device 40 so that a curl of the first optical film is reduced by a curl applied by the film bonding device in a predetermined direction, thereby obtaining a first multilayer film; and a bonding step wherein the first multilayer film and the second optical film are bonded with each other by the film bonding device so that the first optical axis SA of the first optical film and the second optical axis SD of the second optical film are at a predetermined angle θ, thereby obtaining a second multilayer film, namely the multilayer optical film 1.

Description

積層光学フィルムの製造方法及び液晶パネルの製造方法Method for producing laminated optical film and method for producing liquid crystal panel
　本発明は、積層光学フィルムの製造方法及び液晶パネルの製造方法に関する。 The present invention relates to a method for producing a laminated optical film and a method for producing a liquid crystal panel.
　複数の光学フィルムを貼合して積層光学フィルムを製造する装置として、特許文献１記載のフィルム貼合装置がある。このフィルム貼合装置は、複数の光学フィルムを挟圧して貼合する一対の貼合ローラと、一対の貼合ローラにより貼合された複数の光学フィルムからなる積層光学フィルムを、一対の貼合ローラの接点を通る接線に対して設定角度だけ傾斜した方向に導くガイド部と、を有する。 There is a film bonding apparatus described in Patent Document 1 as an apparatus for manufacturing a laminated optical film by bonding a plurality of optical films. This film laminating apparatus is a pair of laminating optical films composed of a pair of laminating rollers for sandwiching and laminating a plurality of optical films, and a plurality of optical films bonded by a pair of laminating rollers. And a guide portion that leads in a direction inclined by a set angle with respect to a tangent line passing through the contact point of the roller.
　フィルム貼合装置では、一対の貼合ローラにより複数の光学フィルムを貼合して積層光学フィルムを得ることができる。更に、フィルム貼合装置では、設定角度を調整することで、積層光学フィルムにおいて一方向にカール（反り）を付与できる。このように一方向にカールが付与された積層光学フィルムでは、例えば、積層光学フィルムを他の部材に貼合する場合、貼合が容易となる。 In the film bonding apparatus, a laminated optical film can be obtained by bonding a plurality of optical films with a pair of bonding rollers. Furthermore, in a film bonding apparatus, a curl (warp) can be imparted in one direction in the laminated optical film by adjusting the set angle. Thus, in the laminated optical film provided with the curl in one direction, for example, when the laminated optical film is bonded to another member, the bonding becomes easy.
特開２００３－０１１２２５号公報JP 2003-011225 A
　積層光学フィルムが、第１光学軸を有する第１光学フィルムと、第２光学軸を有する第２光学フィルムとを備える場合、積層光学フィルムが所望の光学特性を発現するためには、通常、第１光学軸と第２光学軸とが所定角度を形成しておく必要がある。そのため、第１光学軸と第２光学軸とが所定角度をなすように、第１光学フィルム及び第２光学フィルムをフィルム貼合装置の一対の貼合ローラに送り込まなければない。 When the laminated optical film includes a first optical film having a first optical axis and a second optical film having a second optical axis, in order for the laminated optical film to exhibit desired optical characteristics, usually, It is necessary that the first optical axis and the second optical axis form a predetermined angle. Therefore, the first optical film and the second optical film must be fed into a pair of laminating rollers of the film laminating apparatus so that the first optical axis and the second optical axis form a predetermined angle.
　そのため、第１光学フィルム及び第２光学フィルムの少なくとも一方に、フィルム貼合装置で付与可能なカールの方向と異なる方向のカールが生じている場合、積層光学フィルムに複数の方向のカールが生じる場合がある。この場合、積層光学フィルムを他の部材に貼合する際に、貼合し難いという問題点がある。 Therefore, when curl in a direction different from the direction of curl that can be applied by the film laminating apparatus is generated in at least one of the first optical film and the second optical film, curl in a plurality of directions is generated in the laminated optical film. There is. In this case, there is a problem that it is difficult to bond the laminated optical film to another member.
　そこで、本発明は、それぞれ光学軸を有する２つの光学フィルムを有すると共に、所望のカールが付与された積層光学フィルムを製造可能な積層光学フィルムの製造方法及び積層光学フィルムを含む液晶パネルの製造方法を提供することを主な目的とする。 Therefore, the present invention has two optical films each having an optical axis, and a method for producing a laminated optical film capable of producing a laminated optical film provided with a desired curl, and a method for producing a liquid crystal panel including the laminated optical film The main purpose is to provide
　本発明の一側面に係る積層光学フィルムの製造方法（以下、第１の積層光学フィルムの製造方法とも称す）は、複数のフィルムを挟圧して貼合すると共に、複数のフィルムが貼合された積層フィルムに所定方向においてカールを付与する貼合装置を利用して、第１光学軸を有する第１光学フィルムに、第２光学軸を有する第２光学フィルムを貼合した積層光学フィルムを製造する方法であって、フィルム貼合装置で付与される所定方向のカールによって第１光学フィルムに生じているカールを緩和するように、第１光学フィルムとカール調整用フィルムとを複数のフィルムとしてフィルム貼合装置により貼合することによって、第１積層フィルムを得るカール調整工程と、カール調整工程で得られた第１積層フィルムと第２光学フィルムとを複数のフィルムとして、第１光学軸と第２光学軸とが所定角度をなすように、フィルム貼合装置により貼合することによって、第２積層フィルムとしての積層光学フィルムを得る貼合工程と、を備える。 The method for producing a laminated optical film according to one aspect of the present invention (hereinafter, also referred to as a production method of a first laminated optical film) is a method in which a plurality of films are laminated together with a plurality of films sandwiched therebetween. A laminated optical film in which a second optical film having a second optical axis is bonded to a first optical film having a first optical axis is manufactured using a bonding apparatus that imparts curl to the laminated film in a predetermined direction. In this method, the first optical film and the curl adjusting film are laminated as a plurality of films so as to relieve the curl generated in the first optical film due to the curl in a predetermined direction given by the film laminating apparatus. A curl adjusting step for obtaining a first laminated film by pasting with a combination device, a first laminated film and a second optical film obtained in the curl adjusting step, As a plurality of films, a laminating step of obtaining a laminated optical film as a second laminated film by laminating with a film laminating apparatus so that the first optical axis and the second optical axis form a predetermined angle; Is provided.
　この製造方法では、カール調整工程において、カール調整用フィルムと第１光学フィルムとをフィルム貼合装置で貼合することによって、第１光学フィルムのカールを緩和する。そして、カール調整工程で得られる第１積層フィルムと第２光学フィルムとを貼合して第２積層フィルムとしての積層光学フィルムを得ている。第１積層フィルムでは第１光学フィルムのカールが緩和されているので、積層光学フィルムに生じているカールの方向は、フィルム貼合装置で付与されるカールの方向とし得る。すなわち、上記製造方法では、第１光学フィルムと第２光学フィルムとを第１光学軸及び第２光学軸が所定角度をなすように貼合しながら、所望のカールが付与された積層光学フィルムを製造可能である。 In this manufacturing method, in the curl adjusting step, the curling of the first optical film is eased by bonding the curl adjusting film and the first optical film with a film bonding apparatus. And the 1st laminated film obtained by a curl adjustment process and the 2nd optical film are pasted together, and the laminated optical film as the 2nd laminated film is obtained. Since the curl of the first optical film is relaxed in the first laminated film, the direction of the curl generated in the laminated optical film can be the direction of the curl applied by the film laminating apparatus. That is, in the manufacturing method described above, a laminated optical film to which a desired curl is imparted while bonding the first optical film and the second optical film so that the first optical axis and the second optical axis form a predetermined angle. It can be manufactured.
　本発明の他の側面に係る積層光学フィルムの製造方法（以下、第２の積層光学フィルムの製造方法とも称す）は、複数のフィルムを挟圧して貼合すると共に、複数のフィルムが貼合された積層フィルムに所定方向のカールを付与するフィルム貼合装置を利用して、第１光学軸を有する第１光学フィルムに、第２光学軸を有する第２光学フィルムを貼合した積層光学フィルムを製造する方法であって、第１光学フィルムと第２光学フィルムとを複数のフィルムとして、第１光学軸と第２光学軸とが所定角度をなすように、フィルム貼合装置で貼合して積層光学フィルムを得る貼合工程と、フィルム貼合装置で付与される所定方向のカールによって、貼合工程で積層光学フィルムに付与された所定方向以外の方向のカールを緩和するように、積層光学フィルムとカール調整用フィルムとを複数のフィルムとしてフィルム貼合装置によって貼合するカール調整工程と、を備える。 The method for producing a laminated optical film according to another aspect of the present invention (hereinafter, also referred to as a second laminated optical film producing method) sandwiches and laminates a plurality of films, and a plurality of films are laminated. A laminated optical film obtained by laminating a second optical film having a second optical axis on a first optical film having a first optical axis using a film laminating apparatus that imparts curl in a predetermined direction to the laminated film. It is a manufacturing method, Comprising: A 1st optical film and a 2nd optical film are made into a some film, It bonds with a film bonding apparatus so that a 1st optical axis and a 2nd optical axis may make a predetermined angle. In order to relieve the curling in the direction other than the predetermined direction applied to the laminated optical film in the bonding step by the bonding step to obtain the laminated optical film and the curl in the predetermined direction applied by the film bonding apparatus. It comprises a curl adjusting step to be bonded by the film bonding apparatus and an optical film and Karl adjusting film as a plurality of films, a.
　この製造方法では、貼合工程において、第１光学フィルムと第２光学フィルムを貼合した積層光学フィルムを得ている。その後、カール調整工程によって、貼合工程で積層光学フィルムに付与された所定方向以外の方向のカールを緩和している。第１光学フィルム及び第２光学フィルムの何れか一方が、カールを有している場合、貼合工程後の積層光学フィルムには、フィルム貼合装置で付与される所定方向のカールと共に、第１光学フィルム及び第２光学フィルムの何れか一方が有するカールが含まれる場合がある。そのような場合でも、カール調整工程を備えていることで、積層光学フィルムからフィルム貼合装置で付与される所定方向以外の方向のカールを緩和できる。そのため、上記製造方法では、第１光学フィルムと第２光学フィルムとを第１光学軸及び第２光学軸が所定角度をなすように貼合しながら、所望のカールが付与された積層光学フィルムを製造可能である。 In this manufacturing method, the laminated optical film which bonded the 1st optical film and the 2nd optical film in the bonding process is obtained. Then, the curl adjustment process alleviates curl in directions other than the predetermined direction applied to the laminated optical film in the bonding process. When either one of the first optical film and the second optical film has a curl, the laminated optical film after the bonding step has the first direction together with the curl in a predetermined direction given by the film bonding apparatus. The curl which any one of an optical film and a 2nd optical film has may be contained. Even in such a case, curling in a direction other than the predetermined direction given from the laminated optical film by the film laminating apparatus can be eased by providing the curl adjusting step. Therefore, in the said manufacturing method, the laminated | multilayer optical film to which the desired curl was provided, bonding a 1st optical film and a 2nd optical film so that a 1st optical axis and a 2nd optical axis may make a predetermined angle. It can be manufactured.
　一実施形態において、上記第１光学フィルムは、第１光学軸として吸収軸を有する偏光フィルムであり、偏光フィルムは、吸収軸を有するフィルム本体と、フィルム本体に積層されており前記フィルム本体を保護する表面保護フィルムとを有してもよい。 In one embodiment, the first optical film is a polarizing film having an absorption axis as a first optical axis, and the polarizing film is laminated on the film main body having the absorption axis and protects the film main body. You may have a surface protection film.
　この場合、積層光学フィルムは、偏光フィルムを有するので、例えば、液晶パネルに適用され得る。 In this case, since the laminated optical film has a polarizing film, it can be applied to, for example, a liquid crystal panel.
　第１光学フィルムが偏光フィルムである形態では、カール調整工程前に、第１光学フィルムである偏光フィルムの表面保護フィルムを剥離する剥離工程を更に有し、カール調整工程では、表面保護フィルムが剥離された第１光学フィルムにカール調整用フィルムを貼合してもよい。 In the form in which the first optical film is a polarizing film, the method further includes a peeling step for peeling off the surface protective film of the polarizing film that is the first optical film before the curl adjusting step. In the curl adjusting step, the surface protective film is peeled off. A curl adjusting film may be bonded to the first optical film.
　表面保護フィルムを剥離することで、偏光フィルム内の応力等が緩和される傾向にある。そのため、カール調整工程でカール調整をし易い。 The stress in the polarizing film tends to be relaxed by peeling off the surface protective film. Therefore, it is easy to adjust the curl in the curl adjustment process.
　第１光学フィルムが偏光フィルムである形態では、第２光学フィルムは、第２光学軸として遅相軸を有する位相差フィルムであってもよい。 In the form in which the first optical film is a polarizing film, the second optical film may be a retardation film having a slow axis as the second optical axis.
　この場合、積層光学フィルムは、偏光フィルム及び位相差フィルムを有するので、例えば、液晶パネルに適用され得る。そして、位相差フィルムによって光学補償が可能であることから、液晶パネルで表示される画質が向上し易い。 In this case, since the laminated optical film has a polarizing film and a retardation film, it can be applied to, for example, a liquid crystal panel. And since optical compensation is possible with a phase difference film, the image quality displayed on a liquid crystal panel is easy to improve.
　一実施形態におけるカール調整工程において、カール調整用フィルムは、第１光学フィルムにおいて、第２光学フィルムが貼合されるべき面と反対側の面に貼合されてもよい。 In the curl adjusting step in one embodiment, the curl adjusting film may be bonded to the surface of the first optical film opposite to the surface on which the second optical film is to be bonded.
　一実施形態において、上記フィルム貼合装置は、複数のフィルムを挟圧して貼合する一対の貼合ローラと、一対の貼合ローラにより貼合された複数のフィルムからなる積層フィルムを、一対の貼合ローラの軸線を含む平面に対して設定角度だけ傾斜した方向に導くガイド部と、を有してもよい。 In one embodiment, the film laminating apparatus includes a pair of laminating rollers for laminating and laminating a plurality of films, and a pair of laminated films composed of a plurality of films bonded by a pair of laminating rollers. You may have a guide part guide | induced to the direction inclined only by the setting angle with respect to the plane containing the axis line of a bonding roller.
　この場合、一対の貼合ローラで複数のフィルムで貼合され積層フィルムが得られる。そして、ガイド部が上記のように設けられていることで、積層フィルムは、一対の貼合ローラの軸線を含む平面に対して設定角度だけ傾斜した方向に、一対の貼合ローラから排出される。そのため、積層フィルムは、一対の貼合ローラの一方に掛け渡される。その結果、積層フィルムに所定方向のカールが付与され得る。 In this case, a laminated film is obtained by laminating with a plurality of films with a pair of laminating rollers. And since the guide part is provided as described above, the laminated film is discharged from the pair of bonding rollers in a direction inclined by a set angle with respect to the plane including the axis of the pair of bonding rollers. . Therefore, the laminated film is stretched over one of the pair of bonding rollers. As a result, curling in a predetermined direction can be imparted to the laminated film.
　本発明の他の側面に係る液晶パネルの製造方法は、上記第１又は第２の積層光学フィルムの製造方法によって、第１光学軸を有する第１光学フィルムと第２光学軸を有する第２光学フィルムとが貼合された積層光学フィルムを製造する積層光学フィルム製造工程と、液晶セルに積層光学フィルムを貼合する貼合工程と、を備え、第１光学フィルムは、第１光学軸として吸収軸を有する偏光フィルムである。 According to another aspect of the present invention, there is provided a method for producing a liquid crystal panel, wherein the first optical film having the first optical axis and the second optical axis having the second optical axis are produced by the method for producing the first or second laminated optical film. The laminated optical film manufacturing process which manufactures the laminated optical film with which the film was bonded, and the bonding process which bonds a laminated optical film to a liquid crystal cell are equipped, and a 1st optical film absorbs as a 1st optical axis. A polarizing film having an axis.
　この場合、積層光学フィルムは、第１又は第２の積層光学フィルムの製造方法によって、製造されているので、カールは所望の方向を向いている。そのため、液晶セルに積層光学フィルムを貼合し易い。その結果、液晶パネルを効率的に製造可能である。 In this case, since the laminated optical film is produced by the first or second laminated optical film production method, the curl faces the desired direction. Therefore, it is easy to bond the laminated optical film to the liquid crystal cell. As a result, the liquid crystal panel can be manufactured efficiently.
　一実施形態において、第２光学フィルムは、第２光学軸として遅相軸を有する位相差フィルムであってもよい。 In one embodiment, the second optical film may be a retardation film having a slow axis as the second optical axis.
　この場合、液晶パネルにおいて、光学補償を行えるので、液晶パネルで表示される画像の画質を向上できる。 In this case, since the optical compensation can be performed in the liquid crystal panel, the image quality of the image displayed on the liquid crystal panel can be improved.
　本発明の他の側面は、複数のフィルムを挟圧して貼合すると共に、複数のフィルムが貼合された積層フィルムに所定方向においてカールを付与するフィルム貼合装置を利用して、光学軸を有する光学フィルムにカール調整用フィルムを貼合した積層光学フィルムを製造する方法であって、フィルム貼合装置で付与される所定方向のカールによって光学フィルムに生じているカールを緩和するように、光学フィルムとカール調整用フィルムとを上記複数のフィルムとしてフィルム貼合装置により貼合することによって、上記積層光学フィルムを得る、積層光学フィルムの製造方法にも係る。 Another aspect of the present invention uses a film laminating apparatus that clamps and laminates a plurality of films and applies a curl to a laminated film in which a plurality of films are bonded in a predetermined direction. A method for producing a laminated optical film in which a curl adjusting film is bonded to an optical film having an optical film so as to alleviate the curl generated in the optical film by curling in a predetermined direction provided by a film bonding apparatus. The present invention also relates to a method for producing a laminated optical film, in which the laminated optical film is obtained by bonding a film and a curl adjusting film as the plurality of films with a film bonding apparatus.
　この製造方法では、フィルム貼合装置で付与される所定方向のカールによって、光学軸を有する上記光学フィルムに生じているカールを緩和するように、カール調整用フィルムと光学フィルムとがフィルム貼合装置で貼合される。これによって、カールが緩和された状態の光学フィルムとカール調整用フィルムとの積層光学フィルムが得られる。 In this manufacturing method, the curl adjusting film and the optical film are used to relax the curl generated in the optical film having the optical axis by curling in a predetermined direction applied by the film laminating apparatus. Is pasted. Thereby, a laminated optical film of the optical film in a state where the curl is relaxed and the curl adjusting film is obtained.
　本発明によれば、それぞれ光学軸を有する２つの光学フィルムを有すると共に、所望のカールが付与された積層光学フィルムを製造可能な積層光学フィルムの製造方法及び積層光学フィルムを含む液晶パネルの製造方法を提供し得る。 According to the present invention, there are provided two optical films each having an optical axis and a method for producing a laminated optical film capable of producing a laminated optical film having a desired curl and a method for producing a liquid crystal panel including the laminated optical film. Can provide.
図１は、一実施形態に係る積層光学フィルムの製造方法で製造される積層光学フィルムの一例としての積層偏光フィルムの構成を示す模式図である。Drawing 1 is a mimetic diagram showing the composition of the lamination polarizing film as an example of the lamination optical film manufactured with the manufacturing method of the lamination optical film concerning one embodiment. 図２は、図１に示した積層偏光フィルムの模式的な分解斜視図である。FIG. 2 is a schematic exploded perspective view of the laminated polarizing film shown in FIG. 図３は、図１に示した積層偏光フィルムのカールの状態の一例を示す図面である。FIG. 3 is a view showing an example of a curled state of the laminated polarizing film shown in FIG. 図４は、一実施形態に係る積層光学フィルムの製造方法で使用するフィルム貼合装置を説明する図面である。FIG. 4 is a drawing for explaining a film bonding apparatus used in the method for producing a laminated optical film according to an embodiment. 一実施形態に係る積層光学フィルムの製造方法で使用する第１光学フィルムとしての偏光フィルムの模式的な斜視図である。It is a typical perspective view of the polarizing film as a 1st optical film used with the manufacturing method of the lamination | stacking optical film which concerns on one Embodiment. 図６（ａ）は、一実施形態に係る積層光学フィルムの製造方法におけるカール調整工程を説明するための図面である。図６（ｂ）は、第１光学フィルムの一例である偏光フィルムの一対の貼合ローラへの送り込み状態を説明するための図面である。Drawing 6 (a) is a figure for explaining the curl adjustment process in the manufacturing method of the lamination optical film concerning one embodiment. FIG.6 (b) is drawing for demonstrating the feeding state to a pair of bonding roller of the polarizing film which is an example of a 1st optical film. 図７は、カール調整工程におけるカール調整の原理を模式的に示す図面である。FIG. 7 is a drawing schematically showing the principle of curl adjustment in the curl adjustment step. 図８（ａ）は、一実施形態に係る積層光学フィルムの製造方法における貼合工程を説明するための図面である。図８（ｂ）は、第１積層フィルムの一例である偏光フィルムの一対の貼合ローラへの送り込み状態を説明するための図面である。Fig.8 (a) is drawing for demonstrating the bonding process in the manufacturing method of the laminated optical film which concerns on one Embodiment. FIG.8 (b) is drawing for demonstrating the feeding state to a pair of bonding roller of the polarizing film which is an example of a 1st laminated | multilayer film. 図９（ａ）は、他の実施形態に係る積層光学フィルムの製造方法における貼合工程を説明するための図面である。図９（ｂ）は、第１光学フィルムの一例である偏光フィルムの一対の貼合ローラへの送り込み状態を説明するための図面である。Fig.9 (a) is drawing for demonstrating the bonding process in the manufacturing method of the laminated optical film which concerns on other embodiment. FIG.9 (b) is drawing for demonstrating the feeding state to a pair of bonding roller of the polarizing film which is an example of a 1st optical film. 図１０（ａ）は、他の実施形態に係る積層光学フィルムの製造方法におけるカール調整工程を説明するための図面である。図１０（ｂ）は、積層光学フィルムの一例である積層偏光フィルムの一対の貼合ローラへの送り込み状態を説明するための図面である。FIG. 10A is a drawing for explaining a curl adjusting step in the method for manufacturing a laminated optical film according to another embodiment. FIG.10 (b) is drawing for demonstrating the feeding state to a pair of bonding roller of the laminated polarizing film which is an example of a laminated optical film. 図１１は、一実施形態に係る液晶パネルの製造方法で製造される液晶パネルの構成を模式的に示す図面である。FIG. 11 is a drawing schematically showing a configuration of a liquid crystal panel manufactured by a method for manufacturing a liquid crystal panel according to an embodiment.
　以下、本発明の実施形態について図面を参照しながら説明する。同一の要素には同一符号を付する。重複する説明は省略する。図面の寸法比率は、説明のものと必ずしも一致していない。説明中、「上」、「下」等の方向を示す語は、図面に示された状態に基づいた便宜的な語である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same symbols are assigned to the same elements. A duplicate description is omitted. The dimensional ratios in the drawings do not necessarily match those described. In the description, words indicating directions such as “up” and “down” are convenient words based on the state shown in the drawings.
　（第１の実施形態）
　積層光学フィルムの一例である積層偏光フィルムを製造する形態について説明する。第１の実施形態に係る積層偏光フィルムの製造方法で製造される積層偏光フィルム（積層光学フィルム）１は、図１に模式的に示したように、偏光フィルム（第１光学フィルム）１０と、位相差フィルム（第２光学フィルム）２０とを備え、それらが積層された光学フィルムである。積層偏光フィルム１は、例えば、液晶セルなどに貼合される光学部品である。 (First embodiment)
The form which manufactures the lamination polarizing film which is an example of a lamination optical film is explained. A laminated polarizing film (laminated optical film) 1 produced by the method for producing a laminated polarizing film according to the first embodiment, as schematically shown in FIG. 1, a polarizing film (first optical film) 10, A retardation film (second optical film) 20 and an optical film in which they are laminated. The laminated polarizing film 1 is an optical component that is bonded to, for example, a liquid crystal cell.
　偏光フィルム１０は、偏光子層１１ａ、及び、偏光子層１１ａの両面に積層された保護フィルム層１１ｂ，１１ｃを含むフィルム本体１１と、フィルム本体１１の表面に剥離可能に貼合された表面保護フィルム１２とを有する。 The polarizing film 10 is a film body 11 including a polarizer layer 11a and protective film layers 11b and 11c laminated on both sides of the polarizer layer 11a, and a surface protection that is peelably bonded to the surface of the film body 11. And a film 12.
　偏光子層１１ａは、所定方向に振動する光を選択的に透過する直線偏光特性を有する層であり、一軸延伸されると共に、その延伸方向に二色性色素が吸着配向された樹脂フィルムから構成されている。偏光子層１１ａが有する樹脂フィルムの例は、ポリビニルアルコール（以下「ＰＶＡ」と称す場合もある）系樹脂フィルムであり、ＰＶＡ系樹脂フィルムの例は、ＰＶＡフィルムである。二色性色素の例は、ヨウ素および二色性有機染料である。偏光子層１１ａの厚さの例は、１μｍ～３０μｍである。 The polarizer layer 11a is a layer having linear polarization characteristics that selectively transmits light oscillating in a predetermined direction, and is composed of a resin film that is uniaxially stretched and has a dichroic dye adsorbed and oriented in the stretch direction. Has been. The example of the resin film which the polarizer layer 11a has is a polyvinyl alcohol (hereinafter also referred to as “PVA”) resin film, and the example of the PVA resin film is a PVA film. Examples of dichroic dyes are iodine and dichroic organic dyes. An example of the thickness of the polarizer layer 11a is 1 μm to 30 μm.
　保護フィルム層１１ｂ，１１ｃは樹脂フィルムから構成されている。保護フィルム層１１ｂ，１１ｃを構成する樹脂フィルムの例は、トリアセチルセルロース（以下、「ＴＡＣ」とも称す）系フィルムであり、ＴＡＣ系フィルムの例は、ＴＡＣフィルムである。保護フィルム層１１ｂ，１１ｃの厚さの例は、１０μｍ～２００μｍである。保護フィルム層１１ｂ，１１ｃは、通常、偏光子層１１ａに接着剤層を介して積層される。 The protective film layers 11b and 11c are made of a resin film. The example of the resin film which comprises the protective film layers 11b and 11c is a triacetyl cellulose (henceforth "TAC") type | system | group film, and the example of a TAC type film is a TAC film. An example of the thickness of the protective film layers 11b and 11c is 10 μm to 200 μm. The protective film layers 11b and 11c are usually laminated on the polarizer layer 11a via an adhesive layer.
　偏光フィルム１０は、偏光子層１１ａに保護フィルム層１１ｂ，１１ｃが積層されている形態に限定されず、偏光子層１１ａの両面のうちの一方に保護フィルム層（例えば、保護フィルム層１１ｂ）が積層されていればよい。 The polarizing film 10 is not limited to the form in which the protective film layers 11b and 11c are laminated on the polarizer layer 11a, and the protective film layer (for example, the protective film layer 11b) is provided on one of both surfaces of the polarizer layer 11a. What is necessary is just to be laminated | stacked.
　表面保護フィルム（或いはプロテクトフィルム）１２は、保護フィルム層１１ｂ上に、剥離可能に貼合されている。表面保護フィルム１２の厚さの例は、３０μｍ～１００μｍである。表面保護フィルム１２の材料の例は、ポリエチレン、ポリプロピレン及びポリエステルを含む。一実施形態に係る積層偏光フィルムの製造方法で製造された積層偏光フィルム１が有する表面保護フィルム１２は、積層偏光フィルム１の製造段階では、カール調整用フィルムとして機能するフィルムである。 The surface protective film (or protective film) 12 is detachably bonded on the protective film layer 11b. An example of the thickness of the surface protective film 12 is 30 μm to 100 μm. Examples of the material of the surface protection film 12 include polyethylene, polypropylene, and polyester. The surface protective film 12 included in the laminated polarizing film 1 produced by the method for producing a laminated polarizing film according to an embodiment is a film that functions as a curl adjusting film in the production stage of the laminated polarizing film 1.
　積層偏光フィルム１が貼合された液晶セルなどが液晶表示装置として市場に流通する際には、表面保護フィルム１２は、フィルム本体１１から剥離されてもよいフィルムである。すなわち、表面保護フィルム１２は、積層偏光フィルム１の光学特性に影響を与えない透明樹脂フィルムである。 When the liquid crystal cell or the like on which the laminated polarizing film 1 is bonded is marketed as a liquid crystal display device, the surface protective film 12 is a film that may be peeled off from the film body 11. That is, the surface protective film 12 is a transparent resin film that does not affect the optical characteristics of the laminated polarizing film 1.
　位相差フィルム２０は、保護フィルム層１１ｃ上に貼合されている。より具体的には、位相差フィルム２０は、粘着剤層を介して保護フィルム層１１ｃに貼合される。この粘着剤層は、通常、予め保護フィルム層１１ｃ上に設けられている。位相差フィルム２０は、例えば、積層偏光フィルム１が液晶パネルに適用される場合に、光学補償を行うためのフィルムである。位相差フィルム２０は、位相差層２１と、位相差層２１に積層されている粘着剤層２２とを有する。位相差フィルム２０の例は、λ／２板及びλ／４板を含む。 The retardation film 20 is bonded onto the protective film layer 11c. More specifically, the retardation film 20 is bonded to the protective film layer 11c via an adhesive layer. This pressure-sensitive adhesive layer is usually provided on the protective film layer 11c in advance. The retardation film 20 is a film for performing optical compensation when the laminated polarizing film 1 is applied to a liquid crystal panel, for example. The retardation film 20 has a retardation layer 21 and an adhesive layer 22 laminated on the retardation layer 21. Examples of the retardation film 20 include a λ / 2 plate and a λ / 4 plate.
　位相差層２１は、屈折率差によって位相差を生成する機能を有する層である。位相差層２１は、例えば樹脂フィルムであり、樹脂フィルムの材料の例は、ポリカーボネイト、ポリエーテルサルホン、シクロオレフィンポリマー等を含む。位相差層２１で実現される位相差は、積層偏光フィルム１の用途に応じたものであればよい。位相差層２１の厚みの例は、１０μｍ～１００μｍである。 The retardation layer 21 is a layer having a function of generating a retardation by a refractive index difference. The retardation layer 21 is, for example, a resin film, and examples of the resin film material include polycarbonate, polyethersulfone, cycloolefin polymer, and the like. The retardation realized by the retardation layer 21 may be anything depending on the use of the laminated polarizing film 1. An example of the thickness of the retardation layer 21 is 10 μm to 100 μm.
　粘着剤層２２は、積層偏光フィルム１を液晶セル等の他の部材に貼り合わせるための層である。粘着剤層２２の厚さの例は５μｍ～３０μｍである。粘着剤層２２を構成する粘着剤の例はアクリル系粘着剤、ウレタン系粘着剤及びシリコーン系粘着剤を含む。 The pressure-sensitive adhesive layer 22 is a layer for bonding the laminated polarizing film 1 to another member such as a liquid crystal cell. An example of the thickness of the pressure-sensitive adhesive layer 22 is 5 μm to 30 μm. Examples of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 22 include an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, and a silicone pressure-sensitive adhesive.
　積層偏光フィルム１においては、粘着剤層２２への異物付着防止等のために、粘着剤層２２上にセパレートフィルム２３が設けられている。この形態では、セパレートフィルム２３が貼合された粘着剤層２２が、位相差層２１に積層される。そのため、セパレートフィルム２３が貼合された粘着剤層２２をセパレートフィルム付き粘着剤層２４とも称す。セパレートフィルム２３の材料の例はポリエチレンテレフタレート（ＰＥＴ）及びポリエチレンを含む。セパレートフィルム２３の厚さの例は３０μｍ～１００μｍである。 In the laminated polarizing film 1, a separate film 23 is provided on the pressure-sensitive adhesive layer 22 in order to prevent foreign matter from adhering to the pressure-sensitive adhesive layer 22. In this form, the pressure-sensitive adhesive layer 22 to which the separate film 23 is bonded is laminated on the retardation layer 21. Therefore, the pressure-sensitive adhesive layer 22 to which the separate film 23 is bonded is also referred to as a pressure-sensitive adhesive layer 24 with a separate film. Examples of the material of the separate film 23 include polyethylene terephthalate (PET) and polyethylene. An example of the thickness of the separate film 23 is 30 μm to 100 μm.
　セパレートフィルム２３は、積層偏光フィルム１が液晶セルなどに貼合される前には、剥離される。そのため、以下、セパレートフィルム２３が剥離された位相差フィルム２０を位相差フィルム２０Ａとも称し、その位相差フィルム２０Ａを含む積層偏光フィルム１を積層偏光フィルム１Ａとも称す。 The separate film 23 is peeled off before the laminated polarizing film 1 is bonded to a liquid crystal cell or the like. Therefore, hereinafter, the retardation film 20 from which the separate film 23 has been peeled is also referred to as a retardation film 20A, and the laminated polarizing film 1 including the retardation film 20A is also referred to as a laminated polarizing film 1A.
　偏光フィルム１０と位相差フィルム２０とは、図２の模式的な分解斜視図で示すように、偏光フィルム１０の吸収軸（第１光学軸）ＳＡと、位相差フィルム２０の光学軸（第２光学軸）ＳＤとが、製品としての積層偏光フィルム１が要求される性能を発現するような所定角度θをなすように、積層されている。図２において、位相差フィルム２０上に破線で示された吸収軸ＳＡは、所定角度θを説明するために、偏光フィルム１０の吸収軸ＳＡを位相差フィルム２０上に投影した吸収軸ＳＡである。 A polarizing film 10 and the retardation film 20, as shown by the schematic exploded perspective view of FIG. 2, the absorption axis of the polarizing film 10 (first optical axis) and S A, the optical axis of the retardation film 20 (the 2 optical axes) SD are laminated so as to form a predetermined angle θ such that the laminated polarizing film 1 as a product exhibits the required performance. In FIG. 2, the absorption axis S A indicated by a broken line on the retardation film 20 is an absorption axis S obtained by projecting the absorption axis S A of the polarizing film 10 onto the retardation film 20 in order to explain the predetermined angle θ. A.
　位相差フィルム２０の光学軸ＳＤは、遅相軸又は進相軸である。以下の説明では、断らない限り、位相差フィルム２０の光学軸ＳＤを遅相軸ＳＤと称す。吸収軸ＳＡと遅相軸ＳＤとのなす所定角度θは、製品としての積層偏光フィルム１の用途に応じた角度であればよい。所定角度θの例は０°及び９０°を含む。 The optical axis SD of the retardation film 20 is a slow axis or a fast axis. In the following description, unless otherwise specified, the optical axis SD of the retardation film 20 is referred to as a slow axis SD . Forming a predetermined angle with the absorption axis S A and the slow axis S D theta may be any angle in accordance with the lamination of the polarizing film 1 application as a product. Examples of the predetermined angle θ include 0 ° and 90 °.
　偏光フィルム１０の吸収軸ＳＡは、偏光フィルム１０を製造する過程において、偏光子層１１ａとなるべき樹脂フィルムを一軸延伸することによって付与されている。位相差フィルム２０の遅相軸ＳＤは、位相差フィルム２０を製造する過程において、位相差層２１となるべき樹脂フィルムを一軸又は二軸延伸することによって付与されている。吸収軸ＳＡ及び遅相軸ＳＤのように光学特性を示す軸を付与するための延伸方法は、乾式及び湿式の延伸方法の何れでもよい。 Absorption axis S A of the polarizing film 10 is a method for producing a polarizing film 10, and is imparted by uniaxially stretching a resin film to be a polarizer layer 11a. The slow axis SD of the retardation film 20 is given by uniaxially or biaxially stretching a resin film to be the retardation layer 21 in the process of producing the retardation film 20. Stretching method for imparting an axis indicating the optical characteristics as the absorption axis S A and the slow axis S D may be any of dry and wet stretching method.
　積層偏光フィルム１には、液晶セルなどの粘着対象物への貼合を容易にする観点から、図３に示したように、カール（反り）が付与されている。図３では、説明の便宜のため、粘着対象物の一例である液晶セル３０を模式的に示している。図３では、液晶セル３０に貼合する際の積層偏光フィルム１として、表面保護フィルム１２が剥離された位相差フィルム２０Ａを備える積層偏光フィルム１Ａを図示している。 From the viewpoint of facilitating pasting to a sticky object such as a liquid crystal cell, the laminated polarizing film 1 is provided with curl (warpage) as shown in FIG. In FIG. 3, for convenience of explanation, a liquid crystal cell 30 that is an example of an adhesion target is schematically illustrated. In FIG. 3, the laminated polarizing film 1 </ b> A including the retardation film 20 </ b> A from which the surface protective film 12 has been peeled is illustrated as the laminated polarizing film 1 when being bonded to the liquid crystal cell 30.
　図３では、平面視形状が矩形である積層偏光フィルム１（１Ａ）において、所定方向として短手方向に積層偏光フィルム１がカールした状態を例示している。ただし、積層偏光フィルム１に付与されているカールの方向は、長手方向でもよい。 FIG. 3 illustrates a state in which the laminated polarizing film 1 is curled in the short direction as the predetermined direction in the laminated polarizing film 1 (1A) having a rectangular shape in plan view. However, the direction of curling applied to the laminated polarizing film 1 may be the longitudinal direction.
　粘着剤層２２を利用して粘着対象物に積層偏光フィルム１を容易に粘着するために、図３に例示したように、粘着剤層２２が、液晶セル３０側に凸となるカール（正カール）が積層偏光フィルム１（１Ａ）に付与される。ただし、積層偏光フィルム１に付与されるカールは、上記正カールと反対側に湾曲した逆カールでもよい。 In order to easily adhere the laminated polarizing film 1 to an adhesive object using the adhesive layer 22, as shown in FIG. 3, the adhesive layer 22 has a curl (positive curl) that protrudes toward the liquid crystal cell 30 side. ) Is applied to the laminated polarizing film 1 (1A). However, the curl imparted to the laminated polarizing film 1 may be a reverse curl curved to the opposite side of the normal curl.
　カールが付与された積層偏光フィルム１は、図４に模式的に示したフィルム貼合装置４０を利用して、偏光フィルム１０と位相差フィルム２０とが貼合されることによって、製造される。偏光フィルム１０のフィルム本体１１と、位相差フィルム２０の位相差層２１とは、通常、粘着剤層を介して積層される。この粘着剤層は、通常、偏光フィルム１０のフィルム本体１１に予め設けられており、この粘着剤層が予め設けられた偏光フィルム１０を用いて、偏光フィルム１０と位相差フィルム２０とが貼合される。 The laminated polarizing film 1 provided with curl is manufactured by laminating the polarizing film 10 and the retardation film 20 using the film laminating apparatus 40 schematically shown in FIG. The film body 11 of the polarizing film 10 and the retardation layer 21 of the retardation film 20 are usually laminated via an adhesive layer. The pressure-sensitive adhesive layer is usually provided in advance on the film body 11 of the polarizing film 10, and the polarizing film 10 and the retardation film 20 are bonded using the polarizing film 10 provided with the pressure-sensitive adhesive layer in advance. Is done.
　フィルム貼合装置４０は、複数のフィルムを挟圧して貼合すると共に、複数のフィルムが貼合された積層フィルムに所定方向のカールを付与する装置である。フィルム貼合装置４０としては、特開２００３－１１２２５号公報に開示されている装置が使用され得る。図４では、複数のフィルムとして２枚のフィルムＦ１，Ｆ２を貼合し、積層フィルムＦ３を作製する形態を例示している。図４に例示したフィルム貼合装置４０について説明する。 The film laminating apparatus 40 is an apparatus that applies a curl in a predetermined direction to a laminated film in which a plurality of films are bonded while sandwiching and laminating a plurality of films. As the film bonding apparatus 40, an apparatus disclosed in Japanese Patent Application Laid-Open No. 2003-11225 can be used. In FIG. 4, the form which bonds the two films F1 and F2 as a some film, and produces the laminated | multilayer film F3 is illustrated. The film bonding apparatus 40 illustrated in FIG. 4 will be described.
　フィルム貼合装置４０は、図４に示したように、フィルムＦ１，Ｆ２を挟圧して貼合し積層フィルムＦ３を製造する一対の貼合ローラ４１Ａ，４１Ｂと、積層フィルムＦ３を、一対の貼合ローラ４１Ａ，４１Ｂの接点を通る接線を含む平面Ｐ１に対して設定角度αだけ傾斜した方向に導くガイド部４２と、を備える。ガイド部４２の一例は、遊転ローラである。 As shown in FIG. 4, the film bonding apparatus 40 includes a pair of bonding rollers 41 </ b> A and 41 </ b> B that sandwich and bond the films F <b> 1 and F <b> 2 to produce a laminated film F <b> 3 and a laminated film F <b> 3. And a guide portion 42 that guides in a direction inclined by a set angle α with respect to a plane P1 including a tangent line passing through the contact points of the combined rollers 41A and 41B. An example of the guide part 42 is an idle roller.
　一対の貼合ローラ４１Ａ，４１Ｂの軸線（回転軸線）を通る平面Ｐ２を基準とした場合、ガイド部４２は、積層フィルムＦ３を、平面Ｐ２に対して設定角度βの方向に導いている。 When the plane P2 passing through the axis (rotation axis) of the pair of bonding rollers 41A and 41B is used as a reference, the guide part 42 guides the laminated film F3 in the direction of the set angle β with respect to the plane P2.
　このフィルム貼合装置４０では、ガイド部４２により、一対の貼合ローラ４１Ａ，４１Ｂから積層フィルムＦ３が、平面Ｐ１に対して設定角度α（又は平面Ｐ２に対して設定角度β）の方向に排出されるので、積層フィルムＦ３は、一対の貼合ローラ４１Ａ，４１Ｂの一方に巻き掛られた状態となる。そのため、所定方向（積層フィルムＦ３の搬送方向）にカールした積層フィルムＦ３が得られる。そして、設定角度α（又は設定角度β）を調整することで、カール量と共に、積層フィルムＦ３の厚み方向におけるカールの方向が調整される。 In this film bonding apparatus 40, the laminated film F3 is discharged from the pair of bonding rollers 41A and 41B in the direction of the set angle α (or the set angle β with respect to the plane P2) from the pair of bonding rollers 41A and 41B. Thus, the laminated film F3 is wound around one of the pair of bonding rollers 41A and 41B. Therefore, a laminated film F3 curled in a predetermined direction (conveying direction of the laminated film F3) is obtained. Then, by adjusting the set angle α (or set angle β), the curl direction in the thickness direction of the laminated film F3 is adjusted together with the curl amount.
　フィルム貼合装置４０において、積層フィルムＦ３に付与するカールの「所定方向」とは、積層フィルムＦ３がカールしていないと仮定した場合において、フィルムＦ１，Ｆ２の積層方向に直交する面内における方向であり、具体的には、積層フィルムＦ３の搬送方向である。 In the film laminating apparatus 40, the “predetermined direction” of curling to be applied to the laminated film F3 is a direction in a plane orthogonal to the laminating direction of the films F1 and F2 when it is assumed that the laminated film F3 is not curled. Specifically, it is the conveyance direction of the laminated film F3.
　次に、フィルム貼合装置４０を利用した積層偏光フィルム１の製造方法の一例について説明する。 Next, an example of the manufacturing method of the laminated polarizing film 1 using the film bonding apparatus 40 will be described.
　積層偏光フィルム１を製造する場合、図５に示したシート状の偏光フィルム１０Ａを準備する。偏光フィルム１０Ａは、フィルム本体１１に表面保護フィルム１３が貼合されたフィルムである。説明の便宜上、偏光フィルム１０Ａが有する表面保護フィルムを、表面保護フィルム１３として、表面保護フィルム１２と区別している。しかしながら、表面保護フィルム１３は表面保護フィルム１２と同じフィルムである。そのため、偏光フィルム１０Ａは、偏光フィルム１０と同じ層構成を有する光学フィルム（第１光学フィルム）である。 When manufacturing the laminated polarizing film 1, the sheet-like polarizing film 10A shown in FIG. 5 is prepared. The polarizing film 10 </ b> A is a film in which a surface protective film 13 is bonded to the film body 11. For convenience of explanation, the surface protective film included in the polarizing film 10 </ b> A is distinguished from the surface protective film 12 as the surface protective film 13. However, the surface protective film 13 is the same film as the surface protective film 12. Therefore, the polarizing film 10 </ b> A is an optical film (first optical film) having the same layer configuration as the polarizing film 10.
　偏光フィルム１０Ａは、偏光フィルム１０Ａの原反ロールから偏光フィルム１０Ａを繰り出しながら、所定の大きさに切り出して得られる枚葉の（或いはシート状の）偏光フィルムである。偏光フィルム１０Ａの大きさは、積層偏光フィルム１と同じでもよいが、通常、積層偏光フィルム１の製品サイズを複数含む大きさである。以下、説明の便宜のため、図５に例示したように、偏光フィルム１０Ａの平面視形状は矩形とし、吸収軸ＳＡの方向は長手方向とする。 The polarizing film 10A is a single-wafer (or sheet-like) polarizing film obtained by cutting out the polarizing film 10A from a raw roll of the polarizing film 10A to a predetermined size. The size of the polarizing film 10 </ b> A may be the same as that of the laminated polarizing film 1, but is usually a size including a plurality of product sizes of the laminated polarizing film 1. Hereinafter, for convenience of description, as illustrated in FIG. 5, the plan view shape of the polarizing film 10A is rectangular, the direction of the absorption axis S A is the longitudinal direction.
　偏光子層１１ａと保護フィルム層１１ｂ，１１ｃとの貼合及び保護フィルム層１１ｂ，１１ｃと表面保護フィルム１３との貼合には、水溶系の接着剤又は紫外線硬化型の接着剤などが利用されている。そのため、偏光フィルム１０Ａにおいては、接着剤の乾燥又は硬化の影響、或いは、偏光フィルム１０Ａを構成する各層の応力の違いなどで、カールが生じる傾向にある。図５では、説明のために、一例として長手方向にカールが生じている形態を例示している。 For bonding of the polarizer layer 11a and the protective film layers 11b and 11c and bonding of the protective film layers 11b and 11c and the surface protective film 13, a water-based adhesive or an ultraviolet curable adhesive is used. ing. Therefore, in the polarizing film 10A, curling tends to occur due to the influence of drying or curing of the adhesive or the difference in stress of each layer constituting the polarizing film 10A. In FIG. 5, for the sake of explanation, a form in which curling occurs in the longitudinal direction is illustrated as an example.
　図５に示したシート状の偏光フィルム１０Ａを利用して積層偏光フィルム１を製造する場合、まず、偏光フィルム１０Ａから表面保護フィルム１３を剥離する（剥離工程）。偏光フィルム１０Ａから表面保護フィルム１３が剥離されたシート状のフィルム本体１１を偏光フィルム１０Ｂと称す。 When manufacturing the laminated polarizing film 1 using the sheet-like polarizing film 10A shown in FIG. 5, first, the surface protective film 13 is peeled from the polarizing film 10A (peeling step). The sheet-like film body 11 from which the surface protective film 13 is peeled off from the polarizing film 10A is referred to as a polarizing film 10B.
　続いて、偏光フィルム１０Ｂに生じている長手方向のカールを緩和するように、フィルム貼合装置４０を利用して、偏光フィルム１０Ｂに、カール調整用フィルムとしての新しい表面保護フィルム１２を貼合する（カール調整工程）。偏光フィルム１０Ｂと表面保護フィルム１２との貼合は、例えば、それらを剥離可能な程度の接着性を有する接着剤を、偏光フィルム１０Ｂとカール調整用フィルムとの界面に塗布しておけばよい。 Subsequently, a new surface protective film 12 as a curl adjusting film is bonded to the polarizing film 10B using the film bonding apparatus 40 so as to relieve the longitudinal curl generated in the polarizing film 10B. (Curl adjustment process). Bonding of the polarizing film 10B and the surface protective film 12 may be performed by, for example, applying an adhesive having adhesiveness enough to peel them off to the interface between the polarizing film 10B and the curl adjusting film.
　具体的には、図６（ａ）に模式的に示すように、表面保護フィルム１２の原反ロールＲ１から表面保護フィルム１２を一対の貼合ローラ４１Ａ，４１Ｂの間に送り込む。同時に、偏光フィルム１０Ｂに生じているカールの方向と、フィルム貼合装置４０で付与可能なカールの方向（表面保護フィルム１２の搬送方向）とを実質的に一致させるように、偏光フィルム１０Ｂを一対の貼合ローラ４１Ａ，４１Ｂ間に送りこむ。 Specifically, as schematically shown in FIG. 6A, the surface protective film 12 is fed between the pair of bonding rollers 41A and 41B from the raw roll R1 of the surface protective film 12. At the same time, a pair of polarizing films 10B is arranged so that the direction of curl generated in the polarizing film 10B substantially coincides with the direction of curling that can be applied by the film laminating apparatus 40 (conveying direction of the surface protective film 12). Are fed between the laminating rollers 41A and 41B.
　偏光フィルム１０Ｂには長手方向にカールが生じている。そのため、図６（ｂ）に示すように、偏光フィルム１０Ｂの長手方向が、一対の貼合ローラ４１Ａ，４１Ｂへの送り込み方向と一致するように、偏光フィルム１０Ｂを一対の貼合ローラ４１Ａ，４１Ｂに搬送する。図６（ｂ）は、図６（ａ）において貼合ローラ４１Ａ側からフィルム貼合装置４０をみた図である。 Curling has occurred in the longitudinal direction of the polarizing film 10B. Therefore, as shown in FIG. 6B, the polarizing film 10B is paired with the pair of bonding rollers 41A and 41B so that the longitudinal direction of the polarizing film 10B coincides with the feeding direction to the pair of bonding rollers 41A and 41B. Transport to. FIG.6 (b) is the figure which looked at the film bonding apparatus 40 from the bonding roller 41A side in Fig.6 (a).
　カール調整工程では、フィルム貼合装置４０における設定角度αを、図７に示すように、偏光フィルム１０Ａのカール（図７において実線で示したカールＣ１）をフィルム貼合装置４０で付与可能なカールでキャンセルするように、カール量が同じであり且つ凸方向が逆向きのカール（図７において破線で示したカールＣ２）を偏光フィルム１０Ａに付与するように設定する。 In the curl adjusting step, the curl that can be applied by the film laminating device 40 with the set angle α in the film laminating device 40 and the curl of the polarizing film 10A (curl C1 indicated by a solid line in FIG. 7) as shown in FIG. So that the curl amount is the same and the curl direction is opposite (curl C2 indicated by a broken line in FIG. 7) is applied to the polarizing film 10A.
　上述したように、表面保護フィルム１２と偏光フィルム１０Ｂとをフィルム貼合装置４０で貼合することにより、表面保護フィルム１２と偏光フィルム１０Ｂとが貼合された第１積層フィルムとしての偏光フィルム１０が、偏光フィルム１０Ｂに生じていたカールがキャンセルされた状態で得られる。 As described above, the polarizing film 10 as the first laminated film in which the surface protective film 12 and the polarizing film 10B are bonded by bonding the surface protective film 12 and the polarizing film 10B with the film bonding apparatus 40. Is obtained in a state where the curl generated in the polarizing film 10B is canceled.
　表面保護フィルム１２は、原反ロールＲ１から繰り出されていることから帯状である。そのため、一対の貼合ローラ４１Ａ，４１Ｂからは、長手方向（一対の貼合ローラ４１Ａ，４１Ｂの排出方向）に、離散的に偏光フィルム１０Ｂが貼合された表面保護フィルム１２が排出される。よって、図６（ｂ）に示したように、一対の貼合ローラ４１Ａ，４１Ｂを通過した帯状の表面保護フィルム１２に離散的に偏光フィルム１０の領域が形成されている。 The surface protective film 12 has a belt shape because it is fed from the raw roll R1. Therefore, the surface protective film 12 on which the polarizing film 10B is discretely bonded in the longitudinal direction (the discharge direction of the pair of bonding rollers 41A and 41B) is discharged from the pair of bonding rollers 41A and 41B. Therefore, as shown in FIG. 6B, regions of the polarizing film 10 are discretely formed on the belt-shaped surface protective film 12 that has passed through the pair of bonding rollers 41A and 41B.
　そのため、偏光フィルム１０Ｂを表面保護フィルム１２に貼合した後、帯状の表面保護フィルム１２の長手方向に離散的に形成されている偏光フィルム１０を切り出す（積層フィルム切出し工程）。切り出しには、切断刃を利用してもよいし、レーザ光を利用してもよい。 Therefore, after the polarizing film 10B is bonded to the surface protective film 12, the polarizing film 10 formed discretely in the longitudinal direction of the band-shaped surface protective film 12 is cut out (laminated film cutting step). For cutting out, a cutting blade may be used, or laser light may be used.
　その後、図８（ａ）に示したように、偏光フィルム１０と位相差フィルム２０とを、フィルム貼合装置４０を利用して貼合する（貼合工程）。偏光フィルム１０と位相差フィルム２０との貼合のために、例えば、偏光フィルム１０と位相差フィルム２０との界面に接着剤を塗布しておいてもよいし、前述したように、偏光フィルム１０において位相差フィルム２０と貼合される面に予め粘着剤層を設けておいてもよい。 Then, as shown to Fig.8 (a), the polarizing film 10 and the phase difference film 20 are bonded using the film bonding apparatus 40 (bonding process). In order to bond the polarizing film 10 and the retardation film 20, for example, an adhesive may be applied to the interface between the polarizing film 10 and the retardation film 20, and as described above, the polarizing film 10. In this case, an adhesive layer may be provided in advance on the surface to be bonded to the retardation film 20.
　具体的には、位相差フィルム２０の遅相軸ＳＤと、偏光フィルム１０の吸収軸ＳＡとが所定角度θをなすと共に、偏光フィルム１０の表面保護フィルム１２と反対側に位相差層２１が貼合されるように、偏光フィルム１０と位相差フィルム２０とを一対の貼合ローラ４１Ａ，４１Ｂ間に送りこむ。 Specifically, the slow axis SD of the retardation film 20 and the absorption axis S A of the polarizing film 10 form a predetermined angle θ, and the retardation layer 21 is opposite to the surface protective film 12 of the polarizing film 10. The polarizing film 10 and the retardation film 20 are fed between the pair of bonding rollers 41A and 41B so that the film is bonded.
　図８（ａ）に示したように、位相差フィルム２０の原反ロールＲ２から位相差フィルム２０を繰り出しながら一対の貼合ローラ４１Ａ，４１Ｂに位相差フィルム２０を送りこむ。説明の便宜のため、位相差フィルム２０の遅相軸ＳＤの方向は、図８（ｂ）に示したように、帯状の位相差フィルム２０の長手方向とする。図８（ｂ）は、図８（ａ）において貼合ローラ４１Ａ側からフィルム貼合装置４０をみた図である。 As shown in FIG. 8A, the retardation film 20 is fed to the pair of bonding rollers 41 </ b> A and 41 </ b> B while the retardation film 20 is fed out from the original roll R <b> 2 of the retardation film 20. For convenience of explanation, the direction of the slow axis SD of the retardation film 20 is the longitudinal direction of the strip-like retardation film 20 as shown in FIG. FIG.8 (b) is the figure which looked at the film bonding apparatus 40 from the bonding roller 41A side in Fig.8 (a).
　偏光フィルム１０において、吸収軸ＳＡは長手方向を向いており、位相差フィルム２０において、遅相軸ＳＤは、位相差フィルム２０の長手方向を向いている。よって、所定角度θが９０°である場合、偏光フィルム１０を、図８（ｂ）に示したように、短手方向に沿って一対の貼合ローラ４１Ａ，４１Ｂに送り込む。 In the polarizing film 10, the absorption axis S A is oriented in the longitudinal direction, the retardation film 20, the slow axis S D are oriented in the longitudinal direction of the retardation film 20. Therefore, when the predetermined angle θ is 90 °, the polarizing film 10 is fed into the pair of bonding rollers 41A and 41B along the short direction as shown in FIG. 8B.
　位相差フィルム２０と偏光フィルム１０とを貼合する際、フィルム貼合装置４０における設定角度αは、製品としての積層偏光フィルム１に付与したいカール（例えば、粘着剤層２２側が外側になるような凸状のカール）が付与されるように設定しておく。 When the retardation film 20 and the polarizing film 10 are bonded together, the set angle α in the film bonding apparatus 40 is a curl (for example, the pressure-sensitive adhesive layer 22 side) that is desired to be applied to the laminated polarizing film 1 as a product. It is set so as to give a convex curl.
　これにより、位相差フィルム２０と偏光フィルム１０とが貼合されると共に、所望のカールが付与された第２積層フィルムとしての積層偏光フィルム１が得られる。製造に利用した偏光フィルム１０Ａがシート状であることから、積層偏光フィルム１もシート状である。 Thereby, while the retardation film 20 and the polarizing film 10 are bonded together, the laminated polarizing film 1 as the second laminated film provided with a desired curl is obtained. Since the polarizing film 10A used for production is a sheet, the laminated polarizing film 1 is also a sheet.
　一対の貼合ローラ４１Ａ，４１Ｂに送り込まれる位相差フィルム２０は、帯状である。そのため、一対の貼合ローラ４１Ａ，４１Ｂからは、帯状の位相差フィルム２０の長手方向に、離散的に偏光フィルム１０が貼合された位相差フィルム２０が排出される。よって、図８（ｂ）に示したように、一対の貼合ローラ４１Ａ，４１Ｂを通過した位相差フィルム２０の長手方向に、積層偏光フィルム１である領域が離散的に形成されている。 The retardation film 20 fed into the pair of bonding rollers 41A and 41B has a belt shape. Therefore, from the pair of bonding rollers 41 </ b> A and 41 </ b> B, the retardation film 20 in which the polarizing film 10 is discretely bonded in the longitudinal direction of the strip-shaped retardation film 20 is discharged. Therefore, as shown in FIG. 8B, regions that are the laminated polarizing films 1 are discretely formed in the longitudinal direction of the retardation film 20 that has passed through the pair of bonding rollers 41A and 41B.
　上記のようにして製造されたシート状の積層偏光フィルム１を製品サイズに加工することによって、製品としてのチップ状の積層偏光フィルム１を得る。製品サイズへの加工では、位相差フィルム２０の長手方向に離散的に形成されている積層偏光フィルム１である領域を直接加工してもよいし、積層偏光フィルム１の領域を一度切り出した後、枚葉の積層偏光フィルム１を更に加工してもよい。シート状の積層偏光フィルム１の製品サイズへの加工方法は、例えば、切断加工である。切断加工と、端面を研磨する研磨加工などを適宜組み合わせてもよい。 The chip-shaped laminated polarizing film 1 as a product is obtained by processing the sheet-shaped laminated polarizing film 1 manufactured as described above into a product size. In the processing to the product size, the region that is the laminated polarizing film 1 discretely formed in the longitudinal direction of the retardation film 20 may be directly processed, or after the region of the laminated polarizing film 1 is cut out once, The single-layer laminated polarizing film 1 may be further processed. The processing method to the product size of the sheet-like laminated polarizing film 1 is, for example, cutting. A cutting process and a polishing process for polishing the end face may be appropriately combined.
　上記製造方法の作用効果を、偏光フィルム１０Ａのカールを調整するカール調整工程を備えない場合と比較して説明する。 The operational effects of the above manufacturing method will be described in comparison with a case where a curl adjustment process for adjusting the curl of the polarizing film 10A is not provided.
　カール調整工程を備えない場合、カールが調整されていない偏光フィルム１０Ａに、フィルム貼合装置４０を利用して位相差フィルム２０が貼合される。偏光フィルム１０Ａと位相差フィルム２０とを貼合する場合、それらを、吸収軸ＳＡ方向と遅相軸ＳＤ方向とが所定角度θをなすように位置合わせする必要がある。すなわち、偏光フィルム１０Ａと位相差フィルム２０との貼合には、吸収軸ＳＡと遅相軸ＳＤとの軸角度の制限がある。この軸角度制限のために、偏光フィルム１０Ａの一対の貼合ローラ４１Ａ，４１Ｂへの送り込み方向が制限される。 When the curl adjusting step is not provided, the retardation film 20 is bonded to the polarizing film 10A in which the curl is not adjusted using the film bonding apparatus 40. If laminating the polarizing film 10A and the retardation film 20, they, and the absorption axis S A direction and the slow axis S D direction needs to align so as to form a predetermined angle theta. In other words, the lamination of the polarizing film 10A and the retardation film 20, there is a shaft angle limits the absorption axis S A and the slow axis S D. Due to this axial angle limitation, the feeding direction of the polarizing film 10A to the pair of bonding rollers 41A and 41B is limited.
　一方、フィルム貼合装置４０では、カールを付与し得る方向は一方向（所定方向）のみである。そのため、偏光フィルム１０Ａと位相差フィルム２０との貼合における軸角度の制限のため、フィルム貼合装置４０が付与し得るカールの方向とは別の方向のカールが偏光フィルム１０Ａに生じている場合、異なる２つの方向のカールを有する積層偏光フィルムが製造される。このように、一方向のカールではなく、複数方向のカールを有する積層偏光フィルムは、例えば、液晶セルに貼合し難い。 On the other hand, in the film bonding apparatus 40, only one direction (predetermined direction) can provide curl. Therefore, when curling in a direction different from the direction of curl that can be imparted by the film laminating apparatus 40 occurs in the polarizing film 10A due to the limitation of the axial angle in laminating the polarizing film 10A and the retardation film 20. A laminated polarizing film having curls in two different directions is produced. Thus, the laminated polarizing film having a plurality of directional curls rather than a unidirectional curl is difficult to bond to, for example, a liquid crystal cell.
　これに対して、図５、図６（ａ），図６（ｂ）、図７、図８（ａ）及び図８（ｂ）を利用して説明した製造方法では、偏光フィルム１０Ａのカールを調整するカール調整工程を有している。カール調整工程では、フィルム本体１１としての偏光フィルム１０Ｂに、表面保護フィルム１２を貼合している。表面保護フィルム１２は、光学特性を規定する軸を有さないフィルムであることから、表面保護フィルム１２と偏光フィルム１０Ｂとの貼合において、軸角度制限は生じない。 In contrast, in the manufacturing method described with reference to FIGS. 5, 6A, 6B, 7, 8A, and 8B, the curling of the polarizing film 10A is not performed. It has a curl adjustment process to adjust. In the curl adjusting step, the surface protective film 12 is bonded to the polarizing film 10 </ b> B as the film body 11. Since the surface protective film 12 is a film that does not have an axis that defines the optical characteristics, no axial angle limitation occurs in the bonding of the surface protective film 12 and the polarizing film 10B.
　そのため、吸収軸ＳＡ方向に依存せずに、偏光フィルム１０Ｂを一対の貼合ローラ４１Ａ，４１Ｂに送り込める。これにより、偏光フィルム１０Ｂに生じているカールであって、積層偏光フィルム１における所望なカールとは異なる方向のカールを、フィルム貼合装置４０で付与されるカールでキャンセルし得る方向で、偏光フィルム１０Ｂを一対の貼合ローラ４１Ａ，４１Ｂに送り込める。その結果、偏光フィルム１０Ｂのカールが実質的にキャンセルされた偏光フィルム１０が得られる。 Therefore, without depending on the absorption axis S A direction, Okurikomeru the polarizing film 10B a pair of lamination rollers 41A and 41B. Thus, the polarizing film is a curl generated in the polarizing film 10 </ b> B in a direction in which a curl in a direction different from a desired curl in the laminated polarizing film 1 can be canceled by the curl applied by the film bonding apparatus 40. 10B can be fed into the pair of bonding rollers 41A and 41B. As a result, the polarizing film 10 in which the curling of the polarizing film 10B is substantially canceled is obtained.
　そのため、実質的にカールを有さない偏光フィルム１０に対して位相差フィルム２０を貼合できる。よって、偏光フィルム１０の吸収軸ＳＡ方向に対して偏光フィルム１０の送り込み方向が規定されていても、積層偏光フィルム１に対して所望の方向のカールを適切に付与できる。その結果、積層偏光フィルム１を、例えば、液晶セルに貼合し易い。 Therefore, the retardation film 20 can be bonded to the polarizing film 10 having substantially no curl. Therefore, even if is prescribed feed direction of the polarizing film 10 with respect to the absorption axis S A direction of the polarizing film 10 can be appropriately curled desired direction relative to the laminated polarizing film 1. As a result, it is easy to bond the laminated polarizing film 1 to, for example, a liquid crystal cell.
　特に、近年、積層偏光フィルム１の薄肉化が要請され、それに伴い、偏光フィルム１０についても薄肉化が要請されている。この場合、偏光フィルム１０となるべき偏光フィルム１０Ａの製造過程において、カール制御が困難であり、位相差フィルム２０との軸角度制限の下での貼合において、積層偏光フィルム１における所望のカールと異なるカールが偏光フィルム１０Ａに生じる傾向にある。 In particular, in recent years, the laminated polarizing film 1 is required to be thin, and accordingly, the polarizing film 10 is also required to be thin. In this case, curl control is difficult in the manufacturing process of the polarizing film 10A to be the polarizing film 10, and the desired curling in the laminated polarizing film 1 can be achieved in bonding with the retardation film 20 under axial angle limitation. Different curls tend to occur in the polarizing film 10A.
　このような偏光フィルム１０Ａでも、上記製造方法では、偏光フィルム１０Ａのカールを調整し、所望のカールが付与された積層偏光フィルム１を製造可能である。そのため、上記製造方法では、所望のカールが付与されたより薄い積層偏光フィルム１を容易に製造可能である。 Even with such a polarizing film 10A, the above-described manufacturing method can adjust the curl of the polarizing film 10A and manufacture the laminated polarizing film 1 provided with a desired curl. Therefore, in the manufacturing method described above, it is possible to easily manufacture a thinner laminated polarizing film 1 provided with a desired curl.
　第１の実施形態で説明した製造方法では、偏光フィルム１０Ｂのカールを調整するカール調整工程前の前処理として、偏光フィルム１０Ａの表面保護フィルム１３を一度剥離している。このように、表面保護フィルム１３を剥離することで、偏光フィルム１０Ｂにおける応力等が緩和される。そのため、カール調整工程で、偏光フィルム１０Ｂのカールを調整し易い。 In the manufacturing method described in the first embodiment, the surface protective film 13 of the polarizing film 10A is once peeled off as a pretreatment before the curling adjustment step for adjusting the curling of the polarizing film 10B. Thus, the stress etc. in the polarizing film 10B are relieved by peeling off the surface protection film 13. Therefore, it is easy to adjust the curl of the polarizing film 10B in the curl adjusting step.
　カール調整工程で、再度、表面保護フィルム１２を貼合しているので、剥離工程と、カール調整工程とを経ることで、フィルム本体１１に対して表面保護フィルムが張り替えられている。従って、表面保護フィルム１２，１３は、上述したように、同じフィルムであり得る。 Since the surface protective film 12 is bonded again in the curl adjusting step, the surface protective film is replaced with respect to the film body 11 through the peeling step and the curl adjusting step. Accordingly, the surface protective films 12 and 13 can be the same film as described above.
　（第２の実施形態）
　第２の実施形態として、偏光フィルムと位相差フィルムとを貼合する貼合工程の後に、偏光フィルムと位相差フィルムとが貼合されてなる積層偏光フィルムのカールを調整するカール調整工程を行う形態について説明する。 (Second Embodiment)
As a second embodiment, after the bonding step of bonding the polarizing film and the retardation film, a curling adjustment step of adjusting the curl of the laminated polarizing film in which the polarizing film and the retardation film are bonded is performed. A form is demonstrated.
　第２の実施形態においても、図５に示したシート状の偏光フィルム１０Ａを使用して積層偏光フィルム１を製造する。第２の実施形態における積層偏光フィルムの製造方法は、貼合工程と、カール調整工程との順番以外は、図５～図８（ｂ）を利用して説明した製造方法と同様であるため、相違点を中心にして説明する。 Also in the second embodiment, the laminated polarizing film 1 is manufactured using the sheet-like polarizing film 10A shown in FIG. Since the manufacturing method of the laminated polarizing film in the second embodiment is the same as the manufacturing method described with reference to FIGS. 5 to 8B except for the order of the bonding step and the curl adjustment step, The description will focus on the differences.
　第２の実施形態の方法では、図９（ａ）に示したように、図５に示した偏光フィルム１０Ａと位相差フィルム２０とをフィルム貼合装置４０に送り込み、位相差フィルム２０と偏光フィルム１０Ａとを貼合し、積層偏光フィルム２を得る（貼合工程）。 In the method of the second embodiment, as shown in FIG. 9A, the polarizing film 10A and the retardation film 20 shown in FIG. 5 are fed into the film laminating apparatus 40, and the retardation film 20 and the polarizing film are fed. 10A is bonded and the laminated polarizing film 2 is obtained (bonding process).
　第２の実施形態における貼合工程は、図８（ａ）に示した偏光フィルム１０の代わりに、偏光フィルム１０Ａを使用している点以外は、図８（ａ）を利用して説明した貼合工程と同様である。従って、吸収軸ＳＡと遅相軸ＳＤとの軸角度制限に応じて、偏光フィルム１０Ａを、その短手方向に沿って一対の貼合ローラ４１Ａ，４１Ｂに送り込む。 The bonding process in 2nd Embodiment is the bonding demonstrated using Fig.8 (a) except the point which uses 10 A of polarizing films instead of the polarizing film 10 shown to Fig.8 (a). This is the same as the combined step. Thus, depending on the axial angle limiting the absorption axis S A and the slow axis S D, the polarizing film 10A, the pair of lamination rollers 41A along the widthwise direction, fed to 41B.
　位相差フィルム２０と偏光フィルム１０Ａとを貼合する際、フィルム貼合装置４０における設定角度αは、製品としての積層偏光フィルム１に付与したいカール（例えば、粘着剤層２２側が外側になるような凸状のカール）が付与されるように設定される。 When laminating the retardation film 20 and the polarizing film 10A, the setting angle α in the film laminating apparatus 40 is a curl (for example, the pressure-sensitive adhesive layer 22 side is desired to be on the outer side) to be applied to the laminated polarizing film 1 as a product (Convex curl) is set.
　偏光フィルム１０Ａには、図５に示したように、長手方向のカールが生じている。一方、フィルム貼合装置４０では、偏光フィルム１０Ａの搬送方向、すなわち、短手方向にカールが付与される。そのため、積層偏光フィルム２には、フィルム貼合装置４０で付与される短手方向のカールと、偏光フィルム１０Ａ自体の長手方向のカールの２方向のカールが生じている。 As shown in FIG. 5, the polarizing film 10A is curled in the longitudinal direction. On the other hand, in the film bonding apparatus 40, curl is provided in the conveyance direction of the polarizing film 10A, that is, the short direction. For this reason, the laminated polarizing film 2 is curled in two directions, that is, a curl in the short direction provided by the film laminating apparatus 40 and a curl in the longitudinal direction of the polarizing film 10A itself.
　一対の貼合ローラ４１Ａ，４１Ｂには、帯状の位相差フィルム２０が送り込まれているので、上記貼合工程では、図９（ｂ）に例示したように、偏光フィルム１０Ａが離散的に貼合された帯状の位相差フィルム２０がフィルム貼合装置４０から排出される。すなわち、帯状の位相差フィルム２０の長手方向において、積層偏光フィルム２である領域が離散的に形成されている。そのため、位相差フィルム２０に偏光フィルム１０Ａを貼合した後、積層偏光フィルム２である領域を切り出し、積層偏光フィルム２を得る。図９（ｂ）は、図９（ａ）において貼合ローラ４１Ａ側からフィルム貼合装置４０を見た図である。 Since the belt-like retardation film 20 is fed into the pair of bonding rollers 41A and 41B, the polarizing film 10A is discretely bonded in the bonding step as illustrated in FIG. 9B. The belt-shaped retardation film 20 thus formed is discharged from the film bonding apparatus 40. That is, in the longitudinal direction of the strip-like retardation film 20, the regions that are the laminated polarizing film 2 are discretely formed. Therefore, after bonding the polarizing film 10 </ b> A to the retardation film 20, the region that is the laminated polarizing film 2 is cut out to obtain the laminated polarizing film 2. FIG.9 (b) is the figure which looked at the film bonding apparatus 40 from the bonding roller 41A side in Fig.9 (a).
　その後、積層偏光フィルム２が有する偏光フィルム１０Ａに含まれる表面保護フィルム１３を剥離する（剥離工程）。 Thereafter, the surface protective film 13 included in the polarizing film 10A included in the laminated polarizing film 2 is peeled off (peeling step).
　続いて、表面保護フィルム１３が剥離された積層偏光フィルム２のカールをキャンセルするように、図１０（ａ）に示したように、積層偏光フィルム２と表面保護フィルム１２とを、フィルム貼合装置４０を利用して貼合する（カール調整工程）。第２の実施形態におけるカール調整工程は、図６（ａ）に示した偏光フィルム１０Ｂの代わりに、積層偏光フィルム２を使用している点以外は、図６（ａ）及び図６（ｂ）を利用して説明したカール調整工程と同様である。従って、第２の実施形態におけるカール調整工程でも、図１０（ｂ）に示したように、積層偏光フィルム２を、長手方向に沿って一対の貼合ローラ４１Ａ，４１Ｂに送り込む。図１０（ｂ）は、図１０（ａ）において貼合ローラ４１Ａ側からフィルム貼合装置４０を見た図である。 Subsequently, as shown in FIG. 10A, the laminated polarizing film 2 and the surface protective film 12 are bonded to a film bonding apparatus so as to cancel the curling of the laminated polarizing film 2 from which the surface protective film 13 has been peeled off. Bonding using 40 (curl adjustment step). The curl adjusting step in the second embodiment is the same as that shown in FIGS. 6A and 6B except that the laminated polarizing film 2 is used instead of the polarizing film 10B shown in FIG. This is the same as the curl adjustment process described using FIG. Therefore, also in the curl adjustment process in the second embodiment, as shown in FIG. 10B, the laminated polarizing film 2 is fed into the pair of bonding rollers 41A and 41B along the longitudinal direction. FIG.10 (b) is the figure which looked at the film bonding apparatus 40 from the bonding roller 41A side in Fig.10 (a).
　フィルム貼合装置４０における設定角度αは、図７を利用して説明したように、偏光フィルム１０Ａのカールを、フィルム貼合装置４０で付与されるカールで打ち消すように、カール量が同じであり且つ逆向きのカールを積層偏光フィルム２に付与するように設定される。 As described with reference to FIG. 7, the set angle α in the film bonding apparatus 40 has the same curl amount so that the curl of the polarizing film 10 </ b> A is canceled by the curl applied by the film bonding apparatus 40. And it sets so that the curl of a reverse direction may be provided to the laminated polarizing film 2. FIG.
　カール調整工程では、表面保護フィルム１３が剥離された偏光フィルム１０Ａに対応するフィルム本体１１に表面保護フィルム１２が貼合される。そのため、カール調整工程を経ることにより、位相差フィルム２０に偏光フィルム１０が貼合された積層偏光フィルム１が得られる。 In the curl adjusting step, the surface protective film 12 is bonded to the film body 11 corresponding to the polarizing film 10A from which the surface protective film 13 has been peeled off. Therefore, the laminated polarizing film 1 in which the polarizing film 10 is bonded to the retardation film 20 is obtained through the curl adjusting step.
　カール調整工程において、積層偏光フィルム２に生じている短手方向と長手方向のカールのうち、積層偏光フィルム１に求められていない長手方向のカールをキャンセルしている。そのため、カール調整工程を経ることで、所望のカールとしての短手方向のカールが付与された積層偏光フィルム１が得られる。 In the curl adjustment step, the curl in the longitudinal direction that is not required for the laminated polarizing film 1 is canceled out of the curls in the short side direction and the longitudinal direction occurring in the laminated polarizing film 2. Therefore, the laminated polarizing film 1 to which the curl in the short direction as the desired curl is imparted is obtained through the curl adjusting step.
　第２の実施形態においても、シート状の偏光フィルム１０Ａを利用して積層偏光フィルム１を製造していることから、第１の実施形態と同様に、フィルム貼合装置４０では、シート状の積層偏光フィルム１が製造される。そのため、シート状の積層偏光フィルム１を製品サイズに加工することで、製品としてのチップ状の積層偏光フィルム１が得られる。 Also in 2nd Embodiment, since the laminated polarizing film 1 is manufactured using the sheet-like polarizing film 10A, in the film bonding apparatus 40, sheet-like lamination | stacking is carried out similarly to 1st Embodiment. The polarizing film 1 is manufactured. Therefore, the chip-shaped laminated polarizing film 1 as a product is obtained by processing the sheet-shaped laminated polarizing film 1 into a product size.
　第２の実施形態は、カール調整工程と、貼合工程の順番が第１の実施形態と相違する点以外は、第１の実施形態と実質的に同様である。従って、第２の実施形態における積層偏光フィルムの製造方法も、第１の実施形態における積層偏光フィルムの製造方法と少なくとも同様の作用効果を有する。 The second embodiment is substantially the same as the first embodiment except that the curl adjustment step and the bonding step are different from the first embodiment. Therefore, the manufacturing method of the laminated polarizing film in the second embodiment also has at least the same effects as the manufacturing method of the laminated polarizing film in the first embodiment.
　（第３の実施形態）
　第３の実施形態として、積層偏光フィルム１を用いて液晶パネルを製造する方法について説明する。以下、第１の実施形態で述べたように、図１に示した層構成の積層偏光フィルム１において、セパレートフィルム２３が剥離された積層偏光フィルム１を積層偏光フィルム１Ａとも称す。 (Third embodiment)
As a third embodiment, a method for manufacturing a liquid crystal panel using the laminated polarizing film 1 will be described. Hereinafter, as described in the first embodiment, in the laminated polarizing film 1 having the layer configuration shown in FIG. 1, the laminated polarizing film 1 from which the separate film 23 is peeled is also referred to as a laminated polarizing film 1 </ b> A.
　図１１に模式的に示したように、液晶パネル３は、液晶セル３０の一方の主面に、積層偏光フィルム１（１Ａ）が貼合されると共に、他方の主面に偏光フィルム５０が貼合されて構成されている。液晶パネル３を液晶表示装置に組み込むときには、積層偏光フィルム１が貼合されている側がユーザ側であり、偏光フィルム５０側が面光源側となるように配置される。 As schematically shown in FIG. 11, in the liquid crystal panel 3, the laminated polarizing film 1 (1 </ b> A) is bonded to one main surface of the liquid crystal cell 30, and the polarizing film 50 is bonded to the other main surface. Combined and configured. When the liquid crystal panel 3 is incorporated into a liquid crystal display device, the side to which the laminated polarizing film 1 is bonded is the user side, and the polarizing film 50 side is the surface light source side.
　液晶セル３０は、公知の液晶パネルに使用されるものであればよい。例えば、液晶セル３０は、ガラス基板上に、透明電極、配向膜、液晶、配向膜、透明電極、カラーフィルタ及びガラス基板が順に設けられたものであり得る。 The liquid crystal cell 30 only needs to be used for a known liquid crystal panel. For example, the liquid crystal cell 30 may be a glass substrate in which a transparent electrode, an alignment film, a liquid crystal, an alignment film, a transparent electrode, a color filter, and a glass substrate are sequentially provided.
　偏光フィルム５０は、偏光フィルム１０Ａに粘着剤層５１が積層された偏光フィルムである。 The polarizing film 50 is a polarizing film in which an adhesive layer 51 is laminated on the polarizing film 10A.
　液晶パネル３は、例えば、次のようにして製造される。まず、第１又は第２の実施形態で説明した積層偏光フィルムの製造方法によって積層偏光フィルム１を製造する（積層偏光フィルム製造工程）。 The liquid crystal panel 3 is manufactured as follows, for example. First, the laminated polarizing film 1 is produced by the production method of the laminated polarizing film described in the first or second embodiment (laminated polarizing film production process).
　次に、液晶セル３０の一方の主面に積層偏光フィルム１を貼合すると共に、他方の主面に、偏光フィルム５０を貼合して、液晶パネル３を得る（積層偏光フィルム貼合工程）。 Next, the laminated polarizing film 1 is bonded to one main surface of the liquid crystal cell 30, and the polarizing film 50 is bonded to the other main surface to obtain the liquid crystal panel 3 (laminated polarizing film bonding step). .
　積層偏光フィルム貼合工程（積層光学フィルム貼合工程）では、積層偏光フィルム１からセパレートフィルム２３を剥離してなる積層偏光フィルム１Ａを、粘着剤層２２を介して液晶セル３０に貼合する。また、偏光フィルム５０の粘着剤層５１を介して偏光フィルム５０を液晶セル３０に貼合する。積層偏光フィルム１と偏光フィルム５０とは、積層偏光フィルム１における偏光フィルム１０と、偏光フィルム５０とがクロスニコル状態になるように液晶セル３０に対して貼合する。 In the laminated polarizing film laminating step (laminated optical film laminating step), the laminated polarizing film 1A obtained by peeling the separate film 23 from the laminated polarizing film 1 is bonded to the liquid crystal cell 30 via the adhesive layer 22. In addition, the polarizing film 50 is bonded to the liquid crystal cell 30 via the pressure-sensitive adhesive layer 51 of the polarizing film 50. The laminated polarizing film 1 and the polarizing film 50 are bonded to the liquid crystal cell 30 so that the polarizing film 10 in the laminated polarizing film 1 and the polarizing film 50 are in a crossed Nicols state.
　上記液晶パネル３の製造方法では、液晶パネル３が有する積層偏光フィルム１は、第１又は第２の実施形態で例示した製造方法で製造されている。そのため、積層偏光フィルム１は、所望のカールが付与されている。これにより、液晶セル３０への積層偏光フィルム１が容易である。そのため、液晶パネル３を効率的に製造し易い。 In the manufacturing method of the liquid crystal panel 3, the laminated polarizing film 1 included in the liquid crystal panel 3 is manufactured by the manufacturing method exemplified in the first or second embodiment. Therefore, the laminated polarizing film 1 is given a desired curl. Thereby, the laminated polarizing film 1 to the liquid crystal cell 30 is easy. Therefore, it is easy to manufacture the liquid crystal panel 3 efficiently.
　以上、本発明の種々の実施形態を説明したが、本発明は、例示した種々の実施形態に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 Although various embodiments of the present invention have been described above, the present invention is not limited to the illustrated various embodiments, and is shown by the scope of claims and has the same meaning and scope as the scope of claims. All changes within are intended to be included.
　第１光学フィルムとして偏光フィルムを例示し、第２光学フィルムとして位相差フィルムを例示した。しかしながら、第１及び第２光学フィルムは、それぞれ光学軸を有する光学フィルムであればよい。例えば、第２光学フィルムは輝度向上フィルムであってもよい。輝度向上フィルムとしては、所定の偏光光を反射する３Ｍ社製のＤＢＥＦ（登録商標）及び３Ｍ社製のＡＰＦが例示される。 A polarizing film was exemplified as the first optical film, and a retardation film was exemplified as the second optical film. However, the first and second optical films may be optical films each having an optical axis. For example, the second optical film may be a brightness enhancement film. Examples of the brightness enhancement film include 3M DBEF (registered trademark) and 3M APF which reflect predetermined polarized light.
　輝度向上フィルムは、例えば、光学軸（透過軸）に平行な偏光光を透過し、光学軸（透過軸）に直交する偏光光を反射する光学フィルムである。第１光学フィルムが偏光フィルムであり、第２光学フィルムが輝度向上フィルムである形態では、輝度向上フィルムは、輝度向上フィルムの光学軸（透過軸）と、偏光フィルムの吸収軸とが直交するように、偏光フィルムに貼合される。 The brightness enhancement film is, for example, an optical film that transmits polarized light parallel to the optical axis (transmission axis) and reflects polarized light orthogonal to the optical axis (transmission axis). In the form in which the first optical film is a polarizing film and the second optical film is a brightness enhancement film, the brightness enhancement film has an optical axis (transmission axis) of the brightness enhancement film and an absorption axis of the polarization film orthogonal to each other. And bonded to the polarizing film.
　偏光フィルムと輝度向上フィルムとが積層された積層偏光フィルムを液晶パネルに適用する場合、偏光フィルム側が液晶セルに貼合される。そのため、偏光フィルムと輝度向上フィルムとが積層された積層偏光フィルムでは、粘着剤層２２は、偏光フィルム側に設けられていればよい。 When a laminated polarizing film in which a polarizing film and a brightness enhancement film are laminated is applied to a liquid crystal panel, the polarizing film side is bonded to a liquid crystal cell. Therefore, in the laminated polarizing film in which the polarizing film and the brightness enhancement film are laminated, the pressure-sensitive adhesive layer 22 only needs to be provided on the polarizing film side.
　図１１に示した液晶パネル３では、液晶セル３０において、積層偏光フィルム１（１Ａ）側と反対側に、偏光フィルム５０を貼合している。しかしながら、例えば、上述した偏光フィルムと輝度向上フィルムとが積層された積層偏光フィルムであって、第１及び第２の実施形態で製造された積層偏光フィルムを、偏光フィルム５０の代わりに液晶セル３０に貼合してもよい。このような液晶パネル３を用いた液晶表示装置では、偏光フィルムと輝度向上フィルムとが積層された積層偏光フィルムが面光源側に位置するように、面光源に対して液晶パネルが配設される。 In the liquid crystal panel 3 shown in FIG. 11, in the liquid crystal cell 30, the polarizing film 50 is bonded to the side opposite to the laminated polarizing film 1 (1A) side. However, for example, it is a laminated polarizing film in which the polarizing film and the brightness enhancement film described above are laminated, and the laminated polarizing film manufactured in the first and second embodiments is replaced by the liquid crystal cell 30 instead of the polarizing film 50. It may be pasted. In such a liquid crystal display device using the liquid crystal panel 3, the liquid crystal panel is disposed with respect to the surface light source so that the laminated polarizing film in which the polarizing film and the brightness enhancement film are laminated is positioned on the surface light source side. .
　カール調整用フィルムとして、製品としての偏光フィルムが有する表面保護フィルムを例示したが、カール調整用フィルムは、積層光学フィルムに剥離可能に設けられていれば特に限定されない。積層光学フィルムが光学部品として使用されるまでに、カール調整用フィルムを剥離すれば、積層光学フィルムの光学特性に影響を与えないからである。従って、カール調整用フィルムは、光学軸を有するフィルムでもよいし、光学軸を有さないフィルムでもよい。 As the curl adjusting film, the surface protective film of the polarizing film as a product is exemplified, but the curl adjusting film is not particularly limited as long as it is provided on the laminated optical film so as to be peelable. This is because if the curl adjusting film is peeled off before the laminated optical film is used as an optical component, the optical characteristics of the laminated optical film are not affected. Accordingly, the curl adjusting film may be a film having an optical axis or a film having no optical axis.
　偏光フィルム１０Ａから表面保護フィルム１３を剥離する工程を備えなくてもよい。この場合、表面保護フィルム１３上に、更に、カール調整用フィルムが貼合されることなる。この場合でも、積層光学フィルムが光学部品として使用されるまでに、表面保護フィルム１３及びカール調整用フィルムの両方又はカール調整用フィルムを剥離すれば、積層光学フィルムの光学特性に影響は生じない。 It is not necessary to provide the process of peeling off the surface protection film 13 from the polarizing film 10A. In this case, a curl adjusting film is further bonded onto the surface protective film 13. Even in this case, if both the surface protective film 13 and the curl adjusting film or the curl adjusting film are peeled off before the laminated optical film is used as an optical component, the optical characteristics of the laminated optical film are not affected.
　ただし、カール調整用フィルムが、偏光フィルムが有する表面保護フィルムとしての透明樹脂フィルムであれば、積層偏光フィルム１の検査などに、公知の方法をそのまま適用できる。 However, if the curl adjusting film is a transparent resin film as a surface protective film of the polarizing film, a known method can be applied as it is to the inspection of the laminated polarizing film 1.
　図５に示した偏光フィルム１０Ａにおける吸収軸ＳＡの方向は偏光フィルム１０Ａの長手方向に限定されない。例えば、偏光フィルム１０Ａの長手方向を基準として一定の角度（例えば、４５°及び６０°など）だけ傾斜していてもよい。通常、原反ロールから繰り出される帯状の偏光フィルの吸収軸の方向は、帯状の偏光フィルムの長手方向に実質的に向いている。そのため、帯状の偏光フィルムから長手方向に対して一定の角度で、シート状の偏光フィルム１０Ａを切り出すことで、吸収軸ＳＡの方向が偏光フィルム１０Ａの長手方向を基準として一定の角度（例えば、４５°、６０°など）だけ傾斜した偏光フィルム１０Ａを得ることができる。 Direction of absorption axis S A in the polarization film 10A shown in FIG. 5 is not limited in the longitudinal direction of the polarizing film 10A. For example, you may incline only the fixed angle (for example, 45 degrees, 60 degrees, etc.) on the basis of the longitudinal direction of 10 A of polarizing films. Usually, the direction of the absorption axis of the strip-shaped polarizing film drawn out from the raw roll is substantially directed to the longitudinal direction of the strip-shaped polarizing film. Therefore, at an angle to the longitudinal direction of a strip-shaped polarizing film, by cutting out a sheet of the polarizing film 10A, a constant angle to the longitudinal direction as the reference direction is the polarizing film 10A of the absorption axis S A (e.g., A polarizing film 10A inclined by 45 °, 60 °, etc. can be obtained.
　位相差フィルム２０の遅相軸ＳＤの方向も帯状の位相差フィルム２０の長手方向に限定されない。樹脂フィルムに位相差を付与するための延伸方向を調整することで、長手方向に対して傾斜した遅相軸ＳＤを有する位相差フィルム２０が得られる。 The direction of the slow axis SD of the retardation film 20 is not limited to the longitudinal direction of the strip-like retardation film 20. By adjusting the stretching direction for imparting a retardation to the resin film, a retardation film 20 having a slow axis SD inclined with respect to the longitudinal direction is obtained.
　第１光学フィルムとして、表面保護フィルムを含む偏光フィルムを例示したが、例えば、図１に示したフィルム本体１１が第１光学フィルムであってもよい。 As the first optical film, a polarizing film including a surface protective film is exemplified, but for example, the film main body 11 shown in FIG. 1 may be the first optical film.
　第１の実施形態として、第１光学フィルムが偏光フィルム単独である形態を例示したが、第１光学フィルムが、偏光フィルムと位相差フィルムとが積層された、いわゆる楕円偏光板であってもよい。この場合、第１光学フィルムの第１光学軸は、第１光学フィルムを構成する偏光フィルムの吸収軸であってもよいし、第１光学フィルムを構成する位相差フィルムの遅相軸であってもよい。第１光学フィルムとしての上記楕円偏光板は、例えば、第１の実施形態で説明した積層偏光フィルムの製造方法で製造され得る。 As an example of the first embodiment, the first optical film is a polarizing film alone. However, the first optical film may be a so-called elliptically polarizing plate in which a polarizing film and a retardation film are laminated. . In this case, the first optical axis of the first optical film may be the absorption axis of the polarizing film constituting the first optical film, or the slow axis of the retardation film constituting the first optical film. Also good. The elliptically polarizing plate as the first optical film can be manufactured, for example, by the method for manufacturing a laminated polarizing film described in the first embodiment.
　第１の実施形態では、偏光フィルム（第１光学フィルム）の吸収軸を第１光学軸とし、位相差フィルム（第２光学フィルム）の遅相軸を第２光学軸としたが、偏光フィルムの吸収軸に対して直交する軸を第１光学軸とし、位相差フィルムの遅相軸に対して直交する軸を第２光学軸としてもよい。 In the first embodiment, the absorption axis of the polarizing film (first optical film) is the first optical axis, and the slow axis of the retardation film (second optical film) is the second optical axis. The axis orthogonal to the absorption axis may be the first optical axis, and the axis orthogonal to the slow axis of the retardation film may be the second optical axis.
　例えば図６（ａ）に示したカール調整工程に着目すれば、フィルム貼合装置４０で付与される所定方向のカールを利用して、光学軸を有する光学フィルム（図６（ａ）では、偏光フィルム１０Ｂ）に生じていたカールが緩和されるように、光学フィルムとカール調整用フィルム（他のフィルム）とが貼合される。その結果、光学軸を有する光学フィルムと、他のフィルムであるカール調整用フィルムが貼合されてなる積層光学フィルムであって、貼合前の光学フィルムに生じていたカールが緩和されている、積層光学フィルムが製造され得る。このように、カールが緩和された光学軸を有する光学フィルムと、他のフィルムとが貼合された積層光学フィルムが製造できれば、その積層光学フィルムと、光学軸を有する他の光学フィルムとを更にフィルム貼合装置４０で貼合することによって、新たな積層光学フィルムに所望のカールを容易に付与できる。 For example, if attention is paid to the curl adjustment process shown in FIG. 6A, an optical film having an optical axis (in FIG. The optical film and the curl adjusting film (other film) are bonded so that the curl generated in the film 10B) is relieved. As a result, an optical film having an optical axis and a laminated optical film obtained by laminating a curl adjusting film that is another film, and curling that has occurred in the optical film before laminating is relaxed, Laminated optical films can be manufactured. Thus, if an optical film having an optical axis with reduced curl and another film can be produced, the laminated optical film and another optical film having an optical axis can be further combined. By bonding with the film bonding apparatus 40, a desired curl can be easily given to a new laminated optical film.
　１…積層偏光フィルム、２…積層偏光フィルム、３…液晶パネル、１０，１０Ａ，１０Ｂ…偏光フィルム、１１…フィルム本体、１１ａ…偏光子層、１１ｂ，１１ｃ…保護フィルム層、１２…表面保護フィルム（カール調整用フィルム）、１３…表面保護フィルム、２０…位相差フィルム（第２光学フィルム）、３０…液晶セル、４０…フィルム貼合装置、４１Ａ，４１Ｂ…一対の貼合ローラ、４２…ガイド部、ＳＡ…吸収軸（第１光学軸）、ＳＤ…遅相軸（第２光学軸）。 DESCRIPTION OF SYMBOLS 1 ... Laminated polarizing film, 2 ... Laminated polarizing film, 3 ... Liquid crystal panel, 10, 10A, 10B ... Polarizing film, 11 ... Film main body, 11a ... Polarizer layer, 11b, 11c ... Protective film layer, 12 ... Surface protective film (Curling adjustment film), 13 ... surface protective film, 20 ... retardation film (second optical film), 30 ... liquid crystal cell, 40 ... film laminating apparatus, 41A, 41B ... a pair of laminating rollers, 42 ... guide Part, S A ... absorption axis (first optical axis), S D ... slow axis (second optical axis).

Claims (10)

  1. 　複数のフィルムを挟圧して貼合すると共に、複数のフィルムが貼合された積層フィルムに所定方向においてカールを付与するフィルム貼合装置を利用して、第１光学軸を有する第１光学フィルムに、第２光学軸を有する第２光学フィルムを貼合した積層光学フィルムを製造する方法であって、
    　前記フィルム貼合装置で付与される前記所定方向のカールによって前記第１光学フィルムに生じているカールを緩和するように、前記第１光学フィルムとカール調整用フィルムとを前記複数のフィルムとして前記フィルム貼合装置により貼合することによって、第１積層フィルムを得るカール調整工程と、
    　前記カール調整工程で得られた前記第１積層フィルムと前記第２光学フィルムとを前記複数のフィルムとして、前記第１光学軸と前記第２光学軸とが所定角度をなすように、前記フィルム貼合装置により貼合することによって、第２積層フィルムとしての積層光学フィルムを得る貼合工程と、
    を備える、積層光学フィルムの製造方法。     A first optical film having a first optical axis is obtained by using a film laminating apparatus that sandwiches and laminates a plurality of films and imparts curl to a laminated film in which a plurality of films are laminated in a predetermined direction. A method for producing a laminated optical film in which a second optical film having a second optical axis is bonded,
    As the plurality of films, the first optical film and the curl adjusting film are used as the plurality of films so as to relieve the curl generated in the first optical film due to the curling in the predetermined direction applied by the film laminating apparatus. A curl adjusting step for obtaining a first laminated film by bonding with a bonding apparatus;
    Using the first laminated film and the second optical film obtained in the curl adjustment step as the plurality of films, the film application is performed so that the first optical axis and the second optical axis form a predetermined angle. A laminating step of obtaining a laminated optical film as a second laminated film by laminating with a combination device;
    A method for producing a laminated optical film.
  2. 　複数のフィルムを挟圧して貼合すると共に、複数のフィルムが貼合された積層フィルムに所定方向のカールを付与するフィルム貼合装置を利用して、第１光学軸を有する第１光学フィルムに、第２光学軸を有する第２光学フィルムを貼合した積層光学フィルムを製造する方法であって、
    　前記第１光学フィルムと前記第２光学フィルムとを前記複数のフィルムとして、前記第１光学軸と前記第２光学軸とが所定角度をなすように、前記フィルム貼合装置で貼合して積層光学フィルムを得る貼合工程と、
    　前記フィルム貼合装置で付与される前記所定方向のカールによって、前記貼合工程で前記積層光学フィルムに付与された前記所定方向以外の方向のカールを緩和するように、前記積層光学フィルムとカール調整用フィルムとを前記複数のフィルムとして、前記フィルム貼合装置によって貼合するカール調整工程と、
    を備える、積層光学フィルムの製造方法。     A first optical film having a first optical axis is obtained by using a film laminating apparatus that sandwiches and laminates a plurality of films and imparts curl in a predetermined direction to a laminated film in which a plurality of films are bonded. A method for producing a laminated optical film in which a second optical film having a second optical axis is bonded,
    The first optical film and the second optical film are used as the plurality of films, and the first optical axis and the second optical axis are laminated with the film laminating apparatus so as to form a predetermined angle. A bonding step to obtain an optical film;
    Curling adjustment with the laminated optical film so as to alleviate curling in a direction other than the predetermined direction applied to the laminated optical film in the bonding step by curling in the predetermined direction applied by the film bonding apparatus. Curl adjustment step of bonding the film for use as the plurality of films by the film bonding apparatus;
    A method for producing a laminated optical film.
  3. 　前記第１光学フィルムは、前記第１光学軸として吸収軸を有する偏光フィルムであり、
    　前記偏光フィルムは、
    　前記吸収軸を有するフィルム本体と、
    　前記フィルム本体に積層されており前記フィルム本体を保護する表面保護フィルムと、
    を有する、
    請求項１又は２に記載の積層光学フィルムの製造方法。     The first optical film is a polarizing film having an absorption axis as the first optical axis,
    The polarizing film is
    A film body having the absorption axis;
    A surface protective film that is laminated to the film body and protects the film body;
    Having
    The manufacturing method of the laminated | multilayer optical film of Claim 1 or 2.
  4. 　前記カール調整工程前に、前記第１光学フィルムである前記偏光フィルムの前記表面保護フィルムを剥離する剥離工程を更に有し、
    　前記カール調整工程では、前記表面保護フィルムが剥離された前記第１光学フィルムに前記カール調整用フィルムを貼合する、
    請求項３に記載の積層光学フィルムの製造方法。     Before the curl adjustment step, further comprising a peeling step of peeling the surface protective film of the polarizing film that is the first optical film,
    In the curl adjusting step, the curl adjusting film is bonded to the first optical film from which the surface protective film has been peeled off.
    A method for producing a laminated optical film according to claim 3.
  5. 　前記第２光学フィルムは、前記第２光学軸として遅相軸を有する位相差フィルムである、
    請求項３又は４に記載の積層光学フィルムの製造方法。     The second optical film is a retardation film having a slow axis as the second optical axis.
    The manufacturing method of the laminated optical film of Claim 3 or 4.
  6. 　前記カール調整工程において、前記カール調整用フィルムは、前記第１光学フィルムにおいて、前記第２光学フィルムが貼合されるべき面と反対側の面に貼合される、
    請求項５に記載の積層光学フィルムの製造方法。     In the curl adjusting step, the curl adjusting film is bonded to a surface opposite to a surface on which the second optical film is to be bonded in the first optical film.
    The method for producing a laminated optical film according to claim 5.
  7. 　前記フィルム貼合装置は、
    　前記複数のフィルムを挟圧して貼合する一対の貼合ローラと、
    　前記一対の貼合ローラにより貼合された前記複数のフィルムからなる積層フィルムを、前記一対の貼合ローラの軸線を含む平面に対して設定角度だけ傾斜した方向に導くガイド部と、を有する、
    請求項１～６の何れか一項に記載の積層光学フィルムの製造方法。     The film bonding apparatus
    A pair of laminating rollers for sandwiching and laminating the plurality of films; and
    A guide part that guides the laminated film composed of the plurality of films bonded by the pair of bonding rollers in a direction inclined by a set angle with respect to a plane including the axis of the pair of bonding rollers;
    The method for producing a laminated optical film according to any one of claims 1 to 6.
  8. 　請求項１又は２に記載の積層光学フィルムの製造方法によって、第１光学軸を有する第１光学フィルムと第２光学軸を有する第２光学フィルムとが貼合された積層光学フィルムを製造する積層光学フィルム製造工程と、
    　液晶セルに前記積層光学フィルムを貼合する貼合工程と、
    を備え、
    　前記第１光学フィルムは、前記第１光学軸として吸収軸を有する偏光フィルムである、
    液晶パネルの製造方法。     The lamination which manufactures the lamination | stacking optical film with which the 1st optical film which has a 1st optical axis, and the 2nd optical film which has a 2nd optical axis were bonded by the manufacturing method of the lamination | stacking optical film of Claim 1 or 2. Optical film manufacturing process;
    A bonding step of bonding the laminated optical film to the liquid crystal cell;
    With
    The first optical film is a polarizing film having an absorption axis as the first optical axis.
    A method for manufacturing a liquid crystal panel.
  9. 　前記第２光学フィルムは、前記第２光学軸として遅相軸を有する位相差フィルムである、
    請求項８に記載の液晶パネルの製造方法。     The second optical film is a retardation film having a slow axis as the second optical axis.
    The manufacturing method of the liquid crystal panel of Claim 8.
  10. 　複数のフィルムを挟圧して貼合すると共に、複数のフィルムが貼合された積層フィルムに所定方向においてカールを付与するフィルム貼合装置を利用して、光学軸を有する光学フィルムにカール調整用フィルムを貼合した積層光学フィルムを製造する方法であって、
    　前記フィルム貼合装置で付与される前記所定方向のカールによって前記光学フィルムに生じているカールを緩和するように、前記光学フィルムと前記カール調整用フィルムとを前記複数のフィルムとして前記フィルム貼合装置により貼合することによって、前記積層光学フィルムを得る、
    積層光学フィルムの製造方法。     A film for curling adjustment is applied to an optical film having an optical axis by using a film laminating apparatus for laminating and laminating a plurality of films and applying a curl to a laminated film in which a plurality of films are laminated in a predetermined direction. A method for producing a laminated optical film bonded with
    The film bonding apparatus using the optical film and the curl adjusting film as the plurality of films so as to relieve the curl generated in the optical film due to the curling in the predetermined direction applied by the film bonding apparatus. To obtain the laminated optical film by bonding,
    A method for producing a laminated optical film.
PCT/JP2016/053205 2015-02-19 2016-02-03 Method for producing multilayer optical film and method for manufacturing liquid crystal panel WO2016132904A1 (en)

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