WO2021131773A1 - Optical film roll - Google Patents

Optical film roll Download PDF

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Publication number
WO2021131773A1
WO2021131773A1 PCT/JP2020/046215 JP2020046215W WO2021131773A1 WO 2021131773 A1 WO2021131773 A1 WO 2021131773A1 JP 2020046215 W JP2020046215 W JP 2020046215W WO 2021131773 A1 WO2021131773 A1 WO 2021131773A1
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WO
WIPO (PCT)
Prior art keywords
optical film
adhesive layer
optical
film roll
roll according
Prior art date
Application number
PCT/JP2020/046215
Other languages
French (fr)
Japanese (ja)
Inventor
俊平 西中
俊 植木
俊之 信岡
Original Assignee
シャープ株式会社
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 シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2021131773A1 publication Critical patent/WO2021131773A1/en

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    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/28—Wound package of webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms

Definitions

  • the present invention relates to an optical film roll.
  • the present application claims priority based on Japanese Patent Application No. 2019-233771 filed in Japan on December 25, 2019, the contents of which are incorporated herein by reference.
  • Patent Document 1 discloses a daylighting film.
  • the daylighting film described in Patent Document 1 has an optical functional surface on which a plurality of daylighting portions are formed.
  • Patent Document 1 discloses that an optical functional surface is opposed to an inner surface of a window glass, and a daylighting film is attached by an adhesive layer.
  • a method of preserving it as an optical film roll wound with a protective film arranged on an adhesive layer can be considered.
  • the optical film may be distorted.
  • it may be difficult to attach the optical film to a window glass or the like with high flatness.
  • one aspect of the present invention is to provide an optical film roll in which distortion is less likely to occur in the optical film.
  • the optical film roll has an optical film having an optical functional surface, a first adhesive surface that adheres to the optical functional surface of the optical film, and a first adhesive surface that faces the first adhesive surface.
  • a roll including an adhesive layer having two adhesive surfaces and a protective film adhering to the second adhesive surface of the adhesive layer is provided. The roll is wound so that the protective film is located outside the optical film.
  • an optical film roll in which distortion is less likely to occur in the optical film.
  • FIG. 2 It is the schematic which shows the structure of the optical film roll of 1st Embodiment of this invention. It is the schematic which shows the state which pulled out a part of the optical film from the optical film roll shown in FIG. 2 is a cross-sectional view taken along the line A1-A1 shown in FIG. 2A. It is an enlarged view of the part surrounded by the circle B shown in FIG. 2B. It is the schematic which shows the structure of the optical film roll in each of the 2nd and 3rd Embodiment of this invention. It is a figure corresponding to the cross section along the line A2-A2 shown in FIG. 3, and is the schematic diagram which shows the state when the optical film is in the form of a roll in the 2nd Embodiment of this invention.
  • FIG. 7A It is a figure corresponding to the cross section along the line A2-A2 shown in FIG. 3, and is the schematic diagram which shows the state when the optical film is in the form of a roll in the 3rd Embodiment of this invention. It is the schematic which shows the structure of the optical film roll of the 4th Embodiment of this invention. It is the schematic which shows the structure of the optical film roll of the 5th Embodiment of this invention. It is sectional drawing along the line A4-A4 shown in FIG. 7A.
  • FIG. 1 is a schematic view showing the configuration of an optical film roll according to the first embodiment of the present invention.
  • FIG. 2A is a schematic view showing a state in which the optical film is pulled out from the optical film roll shown in FIG.
  • FIG. 2B is a cross-sectional view taken along the line A1-A1 shown in FIG. 2A.
  • FIG. 2C is an enlarged view of a portion surrounded by a circle B shown in FIG. 2B.
  • the optical film roll 100 of the first embodiment includes an optical film 110, adhesive layers 121 and 122, and protective films 131 and 132.
  • the optical film 110 has a pair of main surfaces.
  • the optical film 110 has an optical functional surface 111 on one of a pair of main surfaces.
  • the "optical functional surface” means a surface that transmits, refracts, reflects, diffracts, etc. light.
  • the optical functional surface 111 in this embodiment is at least a surface that refracts light.
  • the optical functional surface 111 is composed of a concavo-convex surface including a plurality of concavo-convex surfaces. More specifically, as shown in FIGS. 2B and 2C, the optical functional surface 111 includes a plurality of prism portions 111p (not shown in FIGS.
  • Each of the plurality of prism portions 111p extends linearly in the X direction, which is the winding direction, which is the longitudinal direction of the optical film roll 100. Therefore, the optical functional surface 111 refracts the incident light on the optical film 110 in the Y direction (width direction of the optical film 110) orthogonal to the X direction.
  • the prism portion 111p has a substantially triangular cross-sectional shape.
  • the prism portion may have, for example, an inclined surface, and the cross-sectional shape of the prism portion may be a polygonal shape, a semicircular shape, or the like.
  • the top portion 111t and the bottom portion 111b of the prism portion 111p may be sharp or may have a rounded shape, respectively.
  • the uneven surface including a plurality of uneven surfaces does not necessarily have to be a surface that refracts light.
  • the uneven surface may be a surface that exerts an optical function other than refraction with respect to incident light.
  • the material of the optical film 110 is not particularly limited as long as it has translucency.
  • the optical film 110 may be made of, for example, a resin.
  • the main surface on the side that does not form the optical functional surface 111 is a smooth surface having substantially no unevenness. Is.
  • the present invention is not limited to this configuration.
  • each of the pair of main surfaces of the optical film may be an uneven surface that functions as an optical functional surface.
  • the optical film roll 100 has at least one adhesive layer. Specifically, as shown in FIG. 2B, the optical film roll 100 of the present embodiment has two adhesive layers 121 and 122.
  • the two adhesive layers 121 and 122 are provided at the ends of the optical film 110 in the Y direction (width direction of the optical film 110), respectively.
  • the adhesive layer 121 is provided at one end of the optical film 110 in the Y direction
  • the adhesive layer 122 is provided at the other end of the optical film 110 in the Y direction.
  • the adhesive layer 121 extends along the longitudinal direction (X direction) of the optical film 110 at one end of the optical film 110 in the Y direction.
  • the adhesive layer 121 is provided from one end of the optical film 110 in the X direction to the other end of the other side.
  • the adhesive layer 122 extends along the longitudinal direction (X direction) of the optical film 110 at the other end of the optical film 110 in the Y direction.
  • the adhesive layer 122 is provided from one end to the other end of the optical film 110 in the X direction.
  • the adhesive layer 121 has a first adhesive surface 121a that adheres to the optical functional surface 111 of the optical film 110, and a second adhesive surface 121b that faces the first adhesive surface 121a.
  • the adhesive layer 122 has a first adhesive surface 122a that adheres to the optical functional surface 111 of the optical film 110, and a second adhesive surface 122b that faces the first adhesive surface.
  • the adhesive layers 121 and 122 are not particularly limited as long as they have the first adhesive surfaces 121a and 122a and the second adhesive surfaces 121b and 122b, respectively.
  • the pressure-sensitive adhesive layer may be composed of, for example, at least one pressure-sensitive adhesive layer, or is composed of a laminate of a base material and a pressure-sensitive adhesive layer provided on each of both main surfaces of the base material. May be.
  • the pressure-sensitive adhesive layers 121 and 122 each have a tape-shaped base material 20, a first pressure-sensitive adhesive layer 21, and a second pressure-sensitive adhesive layer 22, respectively.
  • the base material 20 is preferably made of, for example, a non-adhesive resin tape.
  • the base material 20 preferably contains, for example, a porous layer.
  • the base material 20 is preferably made of, for example, a resin tape having a porous layer.
  • the resin tape having a porous layer may be, for example, entirely porous, or may be composed of a porous layer and skin layers located on both sides of the porous layer.
  • the base material 20 can be made of, for example, an acrylic resin, an acrylic resin composition, or the like.
  • a first pressure-sensitive adhesive layer 21 is provided on the first main surface 20a of the base material 20.
  • the first pressure-sensitive adhesive layer 21 constitutes the first pressure-sensitive adhesive surface 121a.
  • a second pressure-sensitive adhesive layer 22 is provided on the second main surface 20b of the base material 20.
  • the second adhesive layer 22 constitutes the second adhesive surface 121b.
  • the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 can each be composed of, for example, an acrylic pressure-sensitive adhesive.
  • the "adhesive layer” means a layer that is composed only of an adhesive and does not contain a base material that does not have adhesiveness.
  • the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 may be a faithful pressure-sensitive adhesive layer or a porous pressure-sensitive adhesive layer (porous pressure-sensitive adhesive layer), respectively.
  • Each of the adhesive layers 121 and 122 has a convex portion that constitutes the optical functional surface 111 of the optical film 110.
  • the convex portion forming the optical functional surface 111 does not reach the base material 20.
  • a space 140 is formed between the bottom portion 111b of the uneven surface forming the optical functional surface 111 and the adhesive layers 121 and 122.
  • the thickness D1 of the adhesive layers 121 and 122 is the thickness direction of the adhesive layers 121 and 122 between the adjacent top 111t and the bottom 111b of the uneven surfaces constituting the optical functional surface 111. It is preferably larger than the dimension D2 along the above, and more preferably twice or more the dimension D2.
  • the protective film 131 is adhered to the second adhesive surface 121b of the adhesive layer 121.
  • the protective film 131 covers substantially the entire second adhesive surface 121b.
  • the protective film 132 is adhered to the second adhesive surface 122b of the adhesive layer 122.
  • the protective film 132 covers substantially the entire second adhesive surface 122b of the adhesive layer 122.
  • the protective films 131 and 132 are non-adhesive films. Therefore, by adhering the protective films 131 and 132 to the adhesive layers 121 and 122, it is possible to prevent the adhesive layers 121 and 122 from undesirably adhering to other members.
  • the protective films 131 and 132 have lower elasticity than the optical films 121 and 122.
  • the protective films 131 and 132 preferably contain a fiber sheet.
  • the fiber sheet may be, for example, a woven fabric or a non-woven fabric such as paper.
  • the protective films 131 and 132 may be made of, for example, paper surface-treated with a silicone resin or the like.
  • “low elasticity” means that the deformation rate when the same stress is applied is small.
  • the "deformation rate” is a value obtained by subtracting the dimension before stress application from the dimension at the time of stress application and dividing the absolute value of the value obtained by dividing the dimension before stress application (
  • the roll containing the optical film 110, the adhesive layers 121 and 122, and the protective films 131 and 132 is wound so that the protective films 131 and 132 are located outside the optical film 110.
  • the optical film roll 100 of the present embodiment distortion of the optical film roll 100 is suppressed. Therefore, when the optical film 110 is pulled out from the optical film roll 100 and the optical film 110 is returned to a flat state, the optical film 110 is less likely to be distorted. Therefore, when the optical film 110 is adhered to a window glass or the like, it is flat. It is possible to adhere to the film without distortion. Therefore, good optical characteristics can be obtained.
  • the optical film is wound so that the side on which the optical functional surface is provided, that is, the side on which the protective film is attached is on the inside.
  • the protective film when the protective film is adhered to a flat optical film and then the optical film and the protective film are wound so that the protective film side is on the inside, compressive stress is applied to the protective film located on the inside, and the protective film is applied to the outside. Tensile stress is applied to the located optical film.
  • the elasticity of the protective film is relatively low, if the protective film cannot be completely shrunk, a part of the protective film may be peeled off and the relative position between the optical film and the protective film may change. Then, the distance of the portion of the optical film peeled from the protective film becomes longer than the distance of the portion of the protective film peeled from the optical film.
  • the roll including the optical film 110, the adhesive layers 121 and 122, and the protective films 131 and 132 is wound so that the protective films 131 and 132 are located outside the optical film 110. .. Therefore, in the optical film roll 100, compressive stress is applied to the optical film 110, and tensile stress is applied to the protective films 131 and 132. In this case, since the elasticity of the protective films 131 and 132 is lower than the elasticity of the optical film 110, the protective films 131 and 132 are difficult to peel off from the optical film 110.
  • the relative positions of the optical film 110 and the protective films 131 and 132 are unlikely to change. Therefore, even if the optical film 110 is pulled out from the optical film roll 100 to form a flat plate, the optical film 110 is not easily deformed. Therefore, when the optical film 110 is adhered to the window glass or the like, it can be adhered flatly and without distortion. Therefore, good optical characteristics can be obtained.
  • the pressure-sensitive adhesive layers 121 and 122 are composed of a laminate of the base material 20, the first pressure-sensitive adhesive layer 21, and the second pressure-sensitive adhesive layer 22. Therefore, the thickness of the adhesive layers 121 and 122 is larger than that in the case where the adhesive layer is composed of a single adhesive layer. Therefore, when the laminated body of the optical film 110, the adhesive layers 121 and 122 and the protective films 131 and 132 is wound up, a large stress is likely to be applied to the optical film 110. Therefore, the technique of the present embodiment capable of suppressing the deformation of the optical film 110 is particularly effective.
  • the optical functional surface 111 is composed of a concavo-convex surface, and even when the concavo-convex surface includes a plurality of prism portions, a laminated body of the optical film 110, the adhesive layers 121, 122 and the protective films 131, 132. A large stress is likely to be applied to the optical film 110 when the film is wound. Further, when the thickness D1 of the adhesive layers 121 and 122 is larger than the distance D2 between the adjacent top 111t and the bottom 111b, the laminated body of the optical film 110, the adhesive layers 121 and 122 and the protective films 131 and 132. A large stress is likely to be applied to the optical film 110 when the film is wound. Therefore, the technique of the present embodiment capable of suppressing the deformation of the optical film 110 is particularly effective.
  • the adhesive layers 121 and 122 preferably include a porous layer. It is more preferable that the base material 20 contains a porous layer. Examples of the porous layer include a foam material (foam material).
  • FIG. 3 is a schematic view showing the configuration of the optical film roll in each of the second embodiments.
  • FIG. 4 is a diagram corresponding to a cross section along the line A2-A2 shown in FIG. 3, and is a schematic view showing a state when the optical film is in the form of a roll in the second embodiment of the present invention. ..
  • the optical film roll according to the second embodiment is different from the optical film roll 100 according to the first embodiment in that the protective films 131 and 132 are divided into a plurality of film pieces 133.
  • the protective films 131 and 132 are divided into a plurality of film pieces 133, as shown in FIG. 4, a laminated body of the optical film 110, the adhesive layers 121 and 122 and the protective films 131 and 132.
  • the distance between the adjacent film pieces 133 is widened, so that it is difficult for stress to be applied to the protective films 131 and 132 and the optical film 110. Therefore, the deformation of the optical film 110 can be suppressed more effectively.
  • FIG. 3 is commonly referred to as the second embodiment.
  • FIG. 5 is a diagram corresponding to a cross section along the line A2-A2 shown in FIG. 3, and is a schematic view showing a state when the optical film is in the form of a roll in the third embodiment of the present invention. ..
  • the optical film roll according to the third embodiment is common to the optical film roll according to the second embodiment in that the protective films 131 and 132 are divided into a plurality of film pieces 133.
  • the optical film roll according to the third embodiment is different from the optical film roll according to the second embodiment in that the adhesive layers 121 and 122 are not arranged between the film pieces 133 adjacent to each other.
  • the adhesive layers 121 and 122 are not arranged between the film pieces 133 adjacent to each other, the laminated body of the optical film 110, the adhesive layers 121 and 122 and the protective films 131 and 132 is wound up. At that time, it is possible to more effectively suppress the application of stress to the optical film 110. Therefore, the deformation of the optical film 110 can be suppressed more effectively.
  • FIG. 6 is a schematic view showing the configuration of an optical film roll according to a fourth embodiment of the present invention.
  • three or more adhesive layers 121, 122, 123 and protective films 131, 132, 133 provided on the adhesive layers 121, 122, 123 are provided on the optical film 110. It may have been done.
  • the optical film 110 can be reliably adhered to the window glass or the like.
  • FIG. 7A is a schematic view showing the configuration of an optical film roll according to a fifth embodiment of the present invention.
  • FIG. 7B is a cross-sectional view taken along the line A4-A4 shown in FIG. 7A.
  • the spacer layer 150 is arranged on at least a part of the region excluding the region where the adhesive layers 121 and 122 of the optical functional surface 111 are adhered. It is different from the optical film roll according to the first to fourth embodiments.
  • the spacer layer 150 since at least a part of the exposed portion of the optical functional surface 111 is covered with the spacer layer 150, it is possible to prevent the optical functional surface 111 from coming into contact with other members or the like. Therefore, it is possible to suppress the deformation of the optical functional surface 111.
  • the spacer layer 150 can be made of, for example, a resin sheet, paper, or the like.

Abstract

Provided is an optical film roll in which distortions do not easily occur in an optical film. This optical film roll comprises a roll that includes an optical film having an optical functional surface, an adhesive layer having a first adhesive surface that is adhered to the optical functional surface of the optical film and a second adhesive surface that is opposite to the first adhesive surface, and a protective film adhered to the second adhesive surface of the adhesive layer, wherein the roll is wound such that the protective film is positioned to the outside of the optical film.

Description

光学フィルムロールOptical film roll
　本発明は、光学フィルムロールに関する。
　本願は、２０１９年１２月２５日に日本で出願された特願２０１９－２３３７７１号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to an optical film roll.
The present application claims priority based on Japanese Patent Application No. 2019-233771 filed in Japan on December 25, 2019, the contents of which are incorporated herein by reference.
　従来の光学フィルムとして、例えば、特許文献１には、採光フィルムが開示されている。特許文献１に記載の採光フィルムは、複数の採光部が形成された光学機能面を有する。特許文献１には、窓ガラスの内面に光学機能面を対向させ、接着層により採光フィルムを貼り付けることが開示されている。 As a conventional optical film, for example, Patent Document 1 discloses a daylighting film. The daylighting film described in Patent Document 1 has an optical functional surface on which a plurality of daylighting portions are formed. Patent Document 1 discloses that an optical functional surface is opposed to an inner surface of a window glass, and a daylighting film is attached by an adhesive layer.
国際公開第２０１８／００８６５６号公報International Publication No. 2018/008656
　特許文献１に記載の採光フィルムを保存する方法としては、例えば、接着層の上に保護フィルムを配した状態で巻き取った光学フィルムロールとして保存する方法が考えられる。しかしながら、採光フィルムを巻き取ってロール状にした場合、光学フィルムに歪みが生じることがある。光学フィルムに歪みが生じると、光学フィルムを高い平坦性で窓ガラス等に取り付けることが困難となる場合がある。 As a method of preserving the daylighting film described in Patent Document 1, for example, a method of preserving it as an optical film roll wound with a protective film arranged on an adhesive layer can be considered. However, when the daylighting film is wound into a roll, the optical film may be distorted. When the optical film is distorted, it may be difficult to attach the optical film to a window glass or the like with high flatness.
　したがって、本発明の一態様は、光学フィルムに歪が生じにくい光学フィルムロールを提供することを目的とする。 Therefore, one aspect of the present invention is to provide an optical film roll in which distortion is less likely to occur in the optical film.
　本発明の一態様の光学フィルムロールは、光学機能面を有する光学フィルムと、前記光学フィルムの前記光学機能面に粘着している第１粘着面と、前記第１粘着面と対向している第２粘着面とを有する粘着層と、前記粘着層の前記第２粘着面に粘着している保護フィルムと、を含むロールを備える。前記ロールは、前記保護フィルムが前記光学フィルムよりも外側に位置するように巻き取られている。 The optical film roll according to one aspect of the present invention has an optical film having an optical functional surface, a first adhesive surface that adheres to the optical functional surface of the optical film, and a first adhesive surface that faces the first adhesive surface. A roll including an adhesive layer having two adhesive surfaces and a protective film adhering to the second adhesive surface of the adhesive layer is provided. The roll is wound so that the protective film is located outside the optical film.
　本発明の一態様によれば、光学フィルムに歪が生じにくい光学フィルムロールを提供することが可能となる。 According to one aspect of the present invention, it is possible to provide an optical film roll in which distortion is less likely to occur in the optical film.
本発明の第１の実施形態の光学フィルムロールの構成を示す概略図である。It is the schematic which shows the structure of the optical film roll of 1st Embodiment of this invention. 図１に示す光学フィルムロールから光学フィルムの一部分を引き出した状態を示す概略図である。It is the schematic which shows the state which pulled out a part of the optical film from the optical film roll shown in FIG. 図２Ａに示すＡ１－Ａ１線に沿った断面図である。2 is a cross-sectional view taken along the line A1-A1 shown in FIG. 2A. 図２Ｂに示す円Ｂで囲った部分の拡大図である。It is an enlarged view of the part surrounded by the circle B shown in FIG. 2B. 本発明の第２及び第３の実施形態のそれぞれにおける光学フィルムロールの構成を示す概略図である。It is the schematic which shows the structure of the optical film roll in each of the 2nd and 3rd Embodiment of this invention. 図３に示すＡ２－Ａ２線に沿った断面に対応する図であり、本発明の第２の実施形態において、光学フィルムがロールの形態であるときの状態を示す模式図である。It is a figure corresponding to the cross section along the line A2-A2 shown in FIG. 3, and is the schematic diagram which shows the state when the optical film is in the form of a roll in the 2nd Embodiment of this invention. 図３に示すＡ２－Ａ２線に沿った断面に対応する図であり、本発明の第３の実施形態において、光学フィルムがロールの形態であるときの状態を示す模式図である。It is a figure corresponding to the cross section along the line A2-A2 shown in FIG. 3, and is the schematic diagram which shows the state when the optical film is in the form of a roll in the 3rd Embodiment of this invention. 本発明の第４の実施形態の光学フィルムロールの構成を示す概略図である。It is the schematic which shows the structure of the optical film roll of the 4th Embodiment of this invention. 本発明の第５の実施形態の光学フィルムロールの構成を示す概略図である。It is the schematic which shows the structure of the optical film roll of the 5th Embodiment of this invention. 図７Ａに示すＡ４－Ａ４線に沿った断面図である。It is sectional drawing along the line A4-A4 shown in FIG. 7A.
　以下、図面を参照しながら、本発明を実施するための形態について詳細に説明する。 Hereinafter, a mode for carrying out the present invention will be described in detail with reference to the drawings.
　［第１の実施形態］
　図１及び図２Ａ～図２Ｃを用いて、本発明の第１の実施形態の光学フィルムロール１００について説明する。図１は、本発明の第１の実施形態の光学フィルムロールの構成を示す概略図である。図２Ａは、図１に示す光学フィルムロールから光学フィルムを引き出した状態を示す概略図である。図２Ｂは、図２Ａに示すＡ１－Ａ１線に沿った断面図である。図２Ｃは、図２Ｂに示す円Ｂで囲った部分の拡大図である。 [First Embodiment]
The optical film roll 100 of the first embodiment of the present invention will be described with reference to FIGS. 1 and 2A to 2C. FIG. 1 is a schematic view showing the configuration of an optical film roll according to the first embodiment of the present invention. FIG. 2A is a schematic view showing a state in which the optical film is pulled out from the optical film roll shown in FIG. FIG. 2B is a cross-sectional view taken along the line A1-A1 shown in FIG. 2A. FIG. 2C is an enlarged view of a portion surrounded by a circle B shown in FIG. 2B.
　図１及び図２Ａ～図２Ｃに示すように、第１の実施形態の光学フィルムロール１００は、光学フィルム１１０と、粘着層１２１、１２２と、保護フィルム１３１、１３２とを備えている。 As shown in FIGS. 1 and 2A to 2C, the optical film roll 100 of the first embodiment includes an optical film 110, adhesive layers 121 and 122, and protective films 131 and 132.
　（光学フィルム１１０）
　図２Ｂに示すように、光学フィルム１１０は、一対の主面を有している。光学フィルム１１０は、一対の主面のうちの一方に光学機能面１１１を有している。本実施形態において、「光学機能面」とは、光を透過、屈折、反射、回折等させる面を意味する。本実施形態における光学機能面１１１は、少なくとも、光を屈折させる面である。具体的には、光学機能面１１１は、複数の凹凸面を含む凹凸面により構成されている。より詳細には、図２Ｂ及び図２Ｃに示すように、光学機能面１１１は、凹凸面を構成する複数のプリズム部１１１ｐ（図１及び図２Ａでは、図示を省略している）を含んでいる。複数のプリズム部１１１ｐは、それぞれ、光学フィルムロール１００の長手方向であって、巻き取り方向であるＸ方向に直線状に延びている。このため、光学機能面１１１は、光学フィルム１１０への入射光を、Ｘ方向に対して直交するＹ方向（光学フィルム１１０の幅方向）に屈折させる。 (Optical film 110)
As shown in FIG. 2B, the optical film 110 has a pair of main surfaces. The optical film 110 has an optical functional surface 111 on one of a pair of main surfaces. In the present embodiment, the "optical functional surface" means a surface that transmits, refracts, reflects, diffracts, etc. light. The optical functional surface 111 in this embodiment is at least a surface that refracts light. Specifically, the optical functional surface 111 is composed of a concavo-convex surface including a plurality of concavo-convex surfaces. More specifically, as shown in FIGS. 2B and 2C, the optical functional surface 111 includes a plurality of prism portions 111p (not shown in FIGS. 1 and 2A) constituting the uneven surface. .. Each of the plurality of prism portions 111p extends linearly in the X direction, which is the winding direction, which is the longitudinal direction of the optical film roll 100. Therefore, the optical functional surface 111 refracts the incident light on the optical film 110 in the Y direction (width direction of the optical film 110) orthogonal to the X direction.
　なお、本実施形態において、プリズム部１１１ｐは、略三角形状の横断面形状を有している。但し、本発明は、これに限定されない。本発明において、プリズム部は、例えば、傾斜面を有していればよく、プリズム部の横断面形状は、多角形状、半円形状等であってもよい。プリズム部１１１ｐの頂部１１１ｔ及び底部１１１ｂは、それぞれ、尖鋭であってもよいし、丸められた形状を有していてもよい。また、本発明において、複数の凹凸を含む凹凸面は、光を屈折させる面である必要は必ずしもない。凹凸面は、入射光に対して屈折以外の光学機能を発揮する面であってもよい。光学フィルム１１０の材質は、透光性を有するものである限りにおいて特に限定されない。光学フィルム１１０は、例えば、樹脂により構成されていてもよい。図２Ｂ及び図２Ｃに示すように、本実施形態では、光学フィルム１１０の一対の主面のうち、光学機能面１１１を構成していない側の主面は、凹凸を実質的に有しない平滑面である。もっとも、本発明は、この構成に限定されない。例えば、光学フィルムの一対の主面のそれぞれが、光学機能面として機能する凹凸面であってもよい。 In the present embodiment, the prism portion 111p has a substantially triangular cross-sectional shape. However, the present invention is not limited to this. In the present invention, the prism portion may have, for example, an inclined surface, and the cross-sectional shape of the prism portion may be a polygonal shape, a semicircular shape, or the like. The top portion 111t and the bottom portion 111b of the prism portion 111p may be sharp or may have a rounded shape, respectively. Further, in the present invention, the uneven surface including a plurality of uneven surfaces does not necessarily have to be a surface that refracts light. The uneven surface may be a surface that exerts an optical function other than refraction with respect to incident light. The material of the optical film 110 is not particularly limited as long as it has translucency. The optical film 110 may be made of, for example, a resin. As shown in FIGS. 2B and 2C, in the present embodiment, of the pair of main surfaces of the optical film 110, the main surface on the side that does not form the optical functional surface 111 is a smooth surface having substantially no unevenness. Is. However, the present invention is not limited to this configuration. For example, each of the pair of main surfaces of the optical film may be an uneven surface that functions as an optical functional surface.
　（粘着層１２１、１２２）
　光学フィルムロール１００は、少なくともひとつの粘着層を有している。具体的には、図２Ｂに示すように、本実施形態の光学フィルムロール１００は、２つの粘着層１２１、１２２を有している。２つの粘着層１２１、１２２は、それぞれ、Ｙ方向（光学フィルム１１０の幅方向）における光学フィルム１１０の端部に設けられている。具体的には、粘着層１２１は、Ｙ方向における光学フィルム１１０の一方側端部に設けられており、粘着層１２２は、Ｙ方向における光学フィルム１１０の他方側端部に設けられている。粘着層１２１は、Ｙ方向における光学フィルム１１０の一方側端部において、光学フィルム１１０の長手方向（Ｘ方向）に沿って延びている。粘着層１２１は、光学フィルム１１０のＸ方向の一方側端部から他方側他端部にわたって設けられている。粘着層１２２は、Ｙ方向における光学フィルム１１０の他方側端部において、光学フィルム１１０の長手方向（Ｘ方向）に沿って延びている。粘着層１２２は、光学フィルム１１０のＸ方向の一方側端部から他方側端部にわたって設けられている。 (Adhesive layers 121, 122)
The optical film roll 100 has at least one adhesive layer. Specifically, as shown in FIG. 2B, the optical film roll 100 of the present embodiment has two adhesive layers 121 and 122. The two adhesive layers 121 and 122 are provided at the ends of the optical film 110 in the Y direction (width direction of the optical film 110), respectively. Specifically, the adhesive layer 121 is provided at one end of the optical film 110 in the Y direction, and the adhesive layer 122 is provided at the other end of the optical film 110 in the Y direction. The adhesive layer 121 extends along the longitudinal direction (X direction) of the optical film 110 at one end of the optical film 110 in the Y direction. The adhesive layer 121 is provided from one end of the optical film 110 in the X direction to the other end of the other side. The adhesive layer 122 extends along the longitudinal direction (X direction) of the optical film 110 at the other end of the optical film 110 in the Y direction. The adhesive layer 122 is provided from one end to the other end of the optical film 110 in the X direction.
　粘着層１２１は、光学フィルム１１０の光学機能面１１１に粘着している第１粘着面１２１ａと、第１粘着面１２１ａと対向している第２粘着面１２１ｂとを有している。粘着層１２２は、光学フィルム１１０の光学機能面１１１に粘着している第１粘着面１２２ａと、第１粘着面と対向している第２粘着面１２２ｂとを有している。 The adhesive layer 121 has a first adhesive surface 121a that adheres to the optical functional surface 111 of the optical film 110, and a second adhesive surface 121b that faces the first adhesive surface 121a. The adhesive layer 122 has a first adhesive surface 122a that adheres to the optical functional surface 111 of the optical film 110, and a second adhesive surface 122b that faces the first adhesive surface.
　粘着層１２１、１２２は、それぞれ、第１粘着面１２１ａ、１２２ａと第２粘着面１２１ｂ、１２２ｂとを有するものである限り特に限定されない。粘着層は、例えば、少なくとも１層の粘着剤層により構成されていてもよいし、基材と、基材の両主面のそれぞれの上に設けられた粘着剤層との積層体により構成されていてもよい。本実施形態では、粘着層１２１、１２２は、それぞれ、テープ状の基材２０と、第１粘着剤層２１と、第２粘着剤層２２とを有する。基材２０は、例えば、粘着性を有しない樹脂テープにより構成されていることが好ましい。基材２０は、例えば、多孔質層を含むことが好ましい。基材２０は、例えば、多孔質層を有する樹脂テープにより構成されていることが好ましい。多孔質層を有する樹脂テープは、例えば、全体が多孔質であってもよいし、多孔質層と、多孔質層の両側に位置するスキン層とにより構成されていてもよい。基材２０は、例えば、アクリル系樹脂や、アクリル系樹脂組成物等により構成することができる。 The adhesive layers 121 and 122 are not particularly limited as long as they have the first adhesive surfaces 121a and 122a and the second adhesive surfaces 121b and 122b, respectively. The pressure-sensitive adhesive layer may be composed of, for example, at least one pressure-sensitive adhesive layer, or is composed of a laminate of a base material and a pressure-sensitive adhesive layer provided on each of both main surfaces of the base material. May be. In the present embodiment, the pressure-sensitive adhesive layers 121 and 122 each have a tape-shaped base material 20, a first pressure-sensitive adhesive layer 21, and a second pressure-sensitive adhesive layer 22, respectively. The base material 20 is preferably made of, for example, a non-adhesive resin tape. The base material 20 preferably contains, for example, a porous layer. The base material 20 is preferably made of, for example, a resin tape having a porous layer. The resin tape having a porous layer may be, for example, entirely porous, or may be composed of a porous layer and skin layers located on both sides of the porous layer. The base material 20 can be made of, for example, an acrylic resin, an acrylic resin composition, or the like.
　基材２０の第１主面２０ａの上には、第１粘着剤層２１が設けられている。この第１粘着剤層２１により第１粘着面１２１ａが構成されている。一方、基材２０の第２主面２０ｂの上には、第２粘着剤層２２が設けられている。この第２粘着剤層２２により第２粘着面１２１ｂが構成されている。第１粘着剤層２１及び第２粘着剤層２２は、それぞれ、例えば、アクリル系粘着剤等により構成することができる。ここで、「粘着剤層」とは、粘着剤のみにより構成されており、粘着性を有しない基材を含まない層を意味する。第１粘着剤層２１及び第２粘着剤層２２は、それぞれ、忠実な粘着剤層であってもよいし、ポーラスな粘着剤層（多孔質粘着剤層）であってもよい。 A first pressure-sensitive adhesive layer 21 is provided on the first main surface 20a of the base material 20. The first pressure-sensitive adhesive layer 21 constitutes the first pressure-sensitive adhesive surface 121a. On the other hand, a second pressure-sensitive adhesive layer 22 is provided on the second main surface 20b of the base material 20. The second adhesive layer 22 constitutes the second adhesive surface 121b. The first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 can each be composed of, for example, an acrylic pressure-sensitive adhesive. Here, the "adhesive layer" means a layer that is composed only of an adhesive and does not contain a base material that does not have adhesiveness. The first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 may be a faithful pressure-sensitive adhesive layer or a porous pressure-sensitive adhesive layer (porous pressure-sensitive adhesive layer), respectively.
　粘着層１２１、１２２のそれぞれには、光学フィルム１１０の光学機能面１１１を構成している凸部が挿入されている。光学機能面１１１を構成している凸部は、基材２０には至っていない。光学機能面１１１を構成している凹凸面の底部１１１ｂと、粘着層１２１、１２２との間には、空間１４０が形成されている。図２Ｃに示すように、粘着層１２１、１２２の厚みＤ１は、光学機能面１１１を構成している凹凸面のうちの隣接する頂部１１１ｔと底部１１１ｂとの間の粘着層１２１、１２２の厚み方向に沿った寸法Ｄ２よりも大きいことが好ましく、Ｄ２の２倍以上であることがより好ましい。 Each of the adhesive layers 121 and 122 has a convex portion that constitutes the optical functional surface 111 of the optical film 110. The convex portion forming the optical functional surface 111 does not reach the base material 20. A space 140 is formed between the bottom portion 111b of the uneven surface forming the optical functional surface 111 and the adhesive layers 121 and 122. As shown in FIG. 2C, the thickness D1 of the adhesive layers 121 and 122 is the thickness direction of the adhesive layers 121 and 122 between the adjacent top 111t and the bottom 111b of the uneven surfaces constituting the optical functional surface 111. It is preferably larger than the dimension D2 along the above, and more preferably twice or more the dimension D2.
　（保護フィルム１３１、１３２）
　図２Ｂに示すように、保護フィルム１３１は、粘着層１２１の第２粘着面１２１ｂに粘着している。保護フィルム１３１は、第２粘着面１２１ｂの実質的に全体を覆っている。保護フィルム１３２は、粘着層１２２の第２粘着面１２２ｂに粘着している。保護フィルム１３２は、粘着層１２２の第２粘着面１２２ｂの実質的に全体を覆っている。保護フィルム１３１、１３２は、粘着性を有しないフィルムである。このため、保護フィルム１３１、１３２を粘着層１２１、１２２に粘着させることにより、粘着層１２１、１２２が他の部材に不所望に粘着することを抑制することができる。保護フィルム１３１、１３２は、光学フィルム１２１、１２２よりも伸縮性が低いことが好ましい。保護フィルム１３１、１３２は、繊維シートを含むことが好ましい。繊維シートは、例えば、織布であってもよいし、紙等の不織布であってもよい。保護フィルム１３１、１３２は、例えば、シリコーン樹脂等で表面処理された紙により構成されていてもよい。なお、本実施形態において、「伸縮性が低い」とは、同じ応力が付与されたときの変形率が小さいことを意味する。「変形率」とは、応力付与時の寸法から応力付与前の寸法を減算して得られた値の絶対値を応力付与前の寸法で除算して得られる値（｜（応力付与時の寸法）－（応力付与前の寸法）｜／（応力付与前の寸法））を意味する。 (Protective films 131, 132)
As shown in FIG. 2B, the protective film 131 is adhered to the second adhesive surface 121b of the adhesive layer 121. The protective film 131 covers substantially the entire second adhesive surface 121b. The protective film 132 is adhered to the second adhesive surface 122b of the adhesive layer 122. The protective film 132 covers substantially the entire second adhesive surface 122b of the adhesive layer 122. The protective films 131 and 132 are non-adhesive films. Therefore, by adhering the protective films 131 and 132 to the adhesive layers 121 and 122, it is possible to prevent the adhesive layers 121 and 122 from undesirably adhering to other members. It is preferable that the protective films 131 and 132 have lower elasticity than the optical films 121 and 122. The protective films 131 and 132 preferably contain a fiber sheet. The fiber sheet may be, for example, a woven fabric or a non-woven fabric such as paper. The protective films 131 and 132 may be made of, for example, paper surface-treated with a silicone resin or the like. In addition, in this embodiment, "low elasticity" means that the deformation rate when the same stress is applied is small. The "deformation rate" is a value obtained by subtracting the dimension before stress application from the dimension at the time of stress application and dividing the absolute value of the value obtained by dividing the dimension before stress application (| (dimension at the time of stress application). )-(Dimensions before stress application) | / (Dimensions before stress application)).
　光学フィルム１１０、粘着層１２１、１２２、及び保護フィルム１３１、１３２を含むロールは、保護フィルム１３１、１３２が光学フィルム１１０よりも外側に位置するように巻き取られている。 The roll containing the optical film 110, the adhesive layers 121 and 122, and the protective films 131 and 132 is wound so that the protective films 131 and 132 are located outside the optical film 110.
　かかる本実施形態の光学フィルムロール１００によれば、光学フィルムロール１００に歪が生じることが抑制される。したがって、光学フィルムロール１００から光学フィルム１１０を引き出し、光学フィルム１１０を平らな状態に戻そうとした際、光学フィルム１１０に歪が生じにくいため、窓ガラス等に光学フィルム１１０を粘着させる際、平坦に歪みなく粘着させることが可能となる。よって、良好な光学特性を得ることができる。 According to the optical film roll 100 of the present embodiment, distortion of the optical film roll 100 is suppressed. Therefore, when the optical film 110 is pulled out from the optical film roll 100 and the optical film 110 is returned to a flat state, the optical film 110 is less likely to be distorted. Therefore, when the optical film 110 is adhered to a window glass or the like, it is flat. It is possible to adhere to the film without distortion. Therefore, good optical characteristics can be obtained.
　上記効果は、保護フィルム１３１、１３２の伸縮性が、光学フィルム１１０及び粘着層１２１、１２２の伸縮性よりも低いときに顕著である。その理由としては、以下の理由が考えられる。 The above effect is remarkable when the elasticity of the protective films 131 and 132 is lower than the elasticity of the optical films 110 and the adhesive layers 121 and 122. The following are possible reasons for this.
　光学機能面が他の部材と接触すると、光学機能面の光学機能が損なわれてしまう場合がある。このため、光学機能面と他の部材との接触を規制したいという要望がある。よって、光学フィルムは、光学機能面が設けられている側、すなわち、保護フィルムが取り付けられた側が内側となるように巻き取られることが好ましいと考えられる。 If the optical functional surface comes into contact with other members, the optical function of the optical functional surface may be impaired. Therefore, there is a demand to regulate the contact between the optical functional surface and other members. Therefore, it is considered preferable that the optical film is wound so that the side on which the optical functional surface is provided, that is, the side on which the protective film is attached is on the inside.
　例えば、平面状の光学フィルムに保護フィルムを粘着させた後に、保護フィルム側が内側となるように光学フィルム及び保護フィルムを巻き取った場合、内側に位置する保護フィルムに圧縮応力が付加され、外側に位置する光学フィルムに引張応力が付加される。ここで、保護フィルムの伸縮性が相対的に低いため、保護フィルムが縮みきれない場合は、保護フィルムの一部が剥離し、光学フィルムと保護フィルムとの相対位置が変化する場合がある。そうすると、光学フィルムの、保護フィルムから剥離している部分の距離が、保護フィルムの、光学フィルムから剥離している部分の距離よりも長くなる。その後、巻き取られた光学フィルム及び保護フィルムを平面状にした場合、光学フィルムの保護フィルムから剥離していた部分が変形する場合がある。一方、本実施形態では、光学フィルム１１０、粘着層１２１、１２２、及び保護フィルム１３１、１３２を含むロールは、保護フィルム１３１、１３２が光学フィルム１１０よりも外側に位置するように巻き取られている。このため、光学フィルムロール１００においては、光学フィルム１１０に圧縮応力が付加され、保護フィルム１３１、１３２に引張応力が付加される。この場合、保護フィルム１３１、１３２の伸縮性が、光学フィルム１１０の伸縮性よりも低いため、保護フィルム１３１、１３２が光学フィルム１１０から剥離しにくい。このため、光学フィルム１１０と保護フィルム１３１、１３２との相対位置が変化しにくい。よって、光学フィルムロール１００から光学フィルム１１０を引き出して平板状にしたとしても光学フィルム１１０が変形し難い。従って、窓ガラス等に光学フィルム１１０を粘着させる際、平坦に歪みなく粘着させることが可能となる。よって、良好な光学特性を得ることができる。 For example, when the protective film is adhered to a flat optical film and then the optical film and the protective film are wound so that the protective film side is on the inside, compressive stress is applied to the protective film located on the inside, and the protective film is applied to the outside. Tensile stress is applied to the located optical film. Here, since the elasticity of the protective film is relatively low, if the protective film cannot be completely shrunk, a part of the protective film may be peeled off and the relative position between the optical film and the protective film may change. Then, the distance of the portion of the optical film peeled from the protective film becomes longer than the distance of the portion of the protective film peeled from the optical film. After that, when the wound optical film and the protective film are flattened, the portion of the optical film that has been peeled off from the protective film may be deformed. On the other hand, in the present embodiment, the roll including the optical film 110, the adhesive layers 121 and 122, and the protective films 131 and 132 is wound so that the protective films 131 and 132 are located outside the optical film 110. .. Therefore, in the optical film roll 100, compressive stress is applied to the optical film 110, and tensile stress is applied to the protective films 131 and 132. In this case, since the elasticity of the protective films 131 and 132 is lower than the elasticity of the optical film 110, the protective films 131 and 132 are difficult to peel off from the optical film 110. Therefore, the relative positions of the optical film 110 and the protective films 131 and 132 are unlikely to change. Therefore, even if the optical film 110 is pulled out from the optical film roll 100 to form a flat plate, the optical film 110 is not easily deformed. Therefore, when the optical film 110 is adhered to the window glass or the like, it can be adhered flatly and without distortion. Therefore, good optical characteristics can be obtained.
　本実施形態では、粘着層１２１、１２２が、基材２０と、第１粘着剤層２１と、第２粘着剤層２２との積層体により構成されている。このため、粘着層が、単一の粘着剤層により構成されている場合と比較して、粘着層１２１、１２２の厚みが大きい。よって、光学フィルム１１０、粘着層１２１、１２２及び保護フィルム１３１、１３２の積層体を巻き取ったときに光学フィルム１１０に大きな応力が加わりやすい。従って、光学フィルム１１０の変形を抑制できる本実施形態の技術が特に有効である。 In the present embodiment, the pressure-sensitive adhesive layers 121 and 122 are composed of a laminate of the base material 20, the first pressure-sensitive adhesive layer 21, and the second pressure-sensitive adhesive layer 22. Therefore, the thickness of the adhesive layers 121 and 122 is larger than that in the case where the adhesive layer is composed of a single adhesive layer. Therefore, when the laminated body of the optical film 110, the adhesive layers 121 and 122 and the protective films 131 and 132 is wound up, a large stress is likely to be applied to the optical film 110. Therefore, the technique of the present embodiment capable of suppressing the deformation of the optical film 110 is particularly effective.
　同様に、光学機能面１１１が凹凸面により構成されている場合、さらには、凹凸面が複数のプリズム部を含む場合も、光学フィルム１１０、粘着層１２１、１２２及び保護フィルム１３１、１３２の積層体を巻き取ったときに光学フィルム１１０に大きな応力が加わりやすい。さらには、粘着層１２１、１２２の厚みＤ１が、隣接する頂部１１１ｔと底部１１１ｂとの間の距離Ｄ２よりも大きいときに、光学フィルム１１０、粘着層１２１、１２２及び保護フィルム１３１、１３２の積層体を巻き取ったときに光学フィルム１１０により大きな応力が加わりやすい。従って、光学フィルム１１０の変形を抑制できる本実施形態の技術が特に有効である。 Similarly, when the optical functional surface 111 is composed of a concavo-convex surface, and even when the concavo-convex surface includes a plurality of prism portions, a laminated body of the optical film 110, the adhesive layers 121, 122 and the protective films 131, 132. A large stress is likely to be applied to the optical film 110 when the film is wound. Further, when the thickness D1 of the adhesive layers 121 and 122 is larger than the distance D2 between the adjacent top 111t and the bottom 111b, the laminated body of the optical film 110, the adhesive layers 121 and 122 and the protective films 131 and 132. A large stress is likely to be applied to the optical film 110 when the film is wound. Therefore, the technique of the present embodiment capable of suppressing the deformation of the optical film 110 is particularly effective.
　光学フィルム１１０、粘着層１２１、１２２及び保護フィルム１３１、１３２の積層体を巻き取ったときに光学フィルム１１０に加わる応力を緩和する観点から、粘着層１２１、１２２が多孔質層を含むことが好ましく、基材２０が多孔質層を含むことがより好ましい。多孔質層としては、例えば、フォーム材（発泡材）が挙げられる。 From the viewpoint of relaxing the stress applied to the optical film 110 when the laminated body of the optical film 110, the adhesive layers 121 and 122 and the protective films 131 and 132 is wound up, the adhesive layers 121 and 122 preferably include a porous layer. It is more preferable that the base material 20 contains a porous layer. Examples of the porous layer include a foam material (foam material).
　以下、本発明の好ましい実施形態の他の例について説明する。以下の説明において、上記第１実施形態と実質的に共通の機能を有する部材を共通の符号で参照し、適宜説明を省略する。 Hereinafter, other examples of preferred embodiments of the present invention will be described. In the following description, members having substantially the same functions as those of the first embodiment will be referred to by a common reference numeral, and the description thereof will be omitted as appropriate.
　［第２の実施形態］
　図３は、第２の実施形態のそれぞれにおける光学フィルムロールの構成を示す概略図である。図４は、図３に示すＡ２－Ａ２線に沿った断面に対応する図であり、本発明の第２の実施形態において、光学フィルムがロールの形態であるときの状態を示す模式図である。 [Second Embodiment]
FIG. 3 is a schematic view showing the configuration of the optical film roll in each of the second embodiments. FIG. 4 is a diagram corresponding to a cross section along the line A2-A2 shown in FIG. 3, and is a schematic view showing a state when the optical film is in the form of a roll in the second embodiment of the present invention. ..
　第２の実施形態に係る光学フィルムロールは、保護フィルム１３１、１３２が複数のフィルム片１３３に分断されている点で、第１の実施形態に係る光学フィルムロール１００と異なる。 The optical film roll according to the second embodiment is different from the optical film roll 100 according to the first embodiment in that the protective films 131 and 132 are divided into a plurality of film pieces 133.
　第２の実施形態では、保護フィルム１３１、１３２が複数のフィルム片１３３に分断されているため、図４に示すように、光学フィルム１１０、粘着層１２１、１２２及び保護フィルム１３１、１３２の積層体を巻き取った際には、隣り合うフィルム片１３３間の間隔が広がるため、保護フィルム１３１、１３２及び光学フィルム１１０に応力が付加されにくい。従って、光学フィルム１１０の変形をより効果的に抑制することができる。 In the second embodiment, since the protective films 131 and 132 are divided into a plurality of film pieces 133, as shown in FIG. 4, a laminated body of the optical film 110, the adhesive layers 121 and 122 and the protective films 131 and 132. When the film is wound, the distance between the adjacent film pieces 133 is widened, so that it is difficult for stress to be applied to the protective films 131 and 132 and the optical film 110. Therefore, the deformation of the optical film 110 can be suppressed more effectively.
　［第３の実施形態］
　第３の実施形態において、図３を第２の実施形態と共通に参照する。図５は、図３に示すＡ２－Ａ２線に沿った断面に対応する図であり、本発明の第３の実施形態において、光学フィルムがロールの形態であるときの状態を示す模式図である。 [Third Embodiment]
In the third embodiment, FIG. 3 is commonly referred to as the second embodiment. FIG. 5 is a diagram corresponding to a cross section along the line A2-A2 shown in FIG. 3, and is a schematic view showing a state when the optical film is in the form of a roll in the third embodiment of the present invention. ..
　第３の実施形態に係る光学フィルムロールは、保護フィルム１３１、１３２が複数のフィルム片１３３に分断されている点で、第２の実施形態に係る光学フィルムロールと共通する。第３の実施形態に係る光学フィルムロールは、互いに隣り合うフィルム片１３３の間に粘着層１２１、１２２が配置されていない点で、第２の実施形態に係る光学フィルムロールと異なる。 The optical film roll according to the third embodiment is common to the optical film roll according to the second embodiment in that the protective films 131 and 132 are divided into a plurality of film pieces 133. The optical film roll according to the third embodiment is different from the optical film roll according to the second embodiment in that the adhesive layers 121 and 122 are not arranged between the film pieces 133 adjacent to each other.
　第３の実施形態では、互いに隣り合うフィルム片１３３の間に粘着層１２１、１２２が配置されていないため、光学フィルム１１０、粘着層１２１、１２２及び保護フィルム１３１、１３２の積層体を巻き取った際に光学フィルム１１０に応力が付加することをより効果的に抑制することができる。従って、光学フィルム１１０の変形をより効果的に抑制することができる。 In the third embodiment, since the adhesive layers 121 and 122 are not arranged between the film pieces 133 adjacent to each other, the laminated body of the optical film 110, the adhesive layers 121 and 122 and the protective films 131 and 132 is wound up. At that time, it is possible to more effectively suppress the application of stress to the optical film 110. Therefore, the deformation of the optical film 110 can be suppressed more effectively.
　［第４の実施形態］
　図６は、本発明の第４の実施形態の光学フィルムロールの構成を示す概略図である。 [Fourth Embodiment]
FIG. 6 is a schematic view showing the configuration of an optical film roll according to a fourth embodiment of the present invention.
　第１～第３の実施形態では、光学フィルム１１０の上に、２本の粘着層１２１、１２２が設けられている例について説明した。但し、本発明は、この構成に限定されない。 In the first to third embodiments, an example in which two adhesive layers 121 and 122 are provided on the optical film 110 has been described. However, the present invention is not limited to this configuration.
　例えば、図６に示すように、光学フィルム１１０上に、３本以上の粘着層１２１、１２２、１２３と、粘着層１２１、１２２、１２３の上に設けられた保護フィルム１３１、１３２、１３３が設けられていてもよい。特に、光学フィルム１１０のＹ方向の幅が大きい場合において、本実施形態によれば、窓ガラス等に光学フィルム１１０を確実に粘着させることができる。 For example, as shown in FIG. 6, three or more adhesive layers 121, 122, 123 and protective films 131, 132, 133 provided on the adhesive layers 121, 122, 123 are provided on the optical film 110. It may have been done. In particular, when the width of the optical film 110 in the Y direction is large, according to the present embodiment, the optical film 110 can be reliably adhered to the window glass or the like.
　［第５の実施形態］
　図７Ａは、本発明の第５の実施形態の光学フィルムロールの構成を示す概略図である。図７Ｂは、図７Ａに示すＡ４－Ａ４線に沿った断面図である。 [Fifth Embodiment]
FIG. 7A is a schematic view showing the configuration of an optical film roll according to a fifth embodiment of the present invention. FIG. 7B is a cross-sectional view taken along the line A4-A4 shown in FIG. 7A.
　第５の実施形態に係る光学フィルムロールは、光学機能面１１１の粘着層１２１、１２２が粘着している領域を除く領域の少なくとも一部の上にスペーサ層１５０が配されている点で、第１～第４の実施形態に係る光学フィルムロールと異なる。 In the optical film roll according to the fifth embodiment, the spacer layer 150 is arranged on at least a part of the region excluding the region where the adhesive layers 121 and 122 of the optical functional surface 111 are adhered. It is different from the optical film roll according to the first to fourth embodiments.
　第５の実施形態では、光学機能面１１１の露出部の少なくとも一部がスペーサ層１５０により覆われているため、光学機能面１１１が他の部材等と接触することを抑制することができる。従って、光学機能面１１１が変形することを抑制することができる。 In the fifth embodiment, since at least a part of the exposed portion of the optical functional surface 111 is covered with the spacer layer 150, it is possible to prevent the optical functional surface 111 from coming into contact with other members or the like. Therefore, it is possible to suppress the deformation of the optical functional surface 111.
　なお、スペーサ層１５０は、例えば、樹脂シートや紙等により構成することができる。 The spacer layer 150 can be made of, for example, a resin sheet, paper, or the like.

Claims (15)

  1. 　光学機能面を有する光学フィルムと、
    　前記光学フィルムの前記光学機能面に粘着している第１粘着面と、前記第１粘着面と対向している第２粘着面とを有する粘着層と、
    　前記粘着層の前記第２粘着面に粘着している保護フィルムと、
    を含むロールを備え、
    　前記ロールは、前記保護フィルムが前記光学フィルムよりも外側に位置するように巻き取られている、
    光学フィルムロール。     An optical film with an optical functional surface and
    An adhesive layer having a first adhesive surface that adheres to the optical functional surface of the optical film and a second adhesive surface that faces the first adhesive surface.
    A protective film that adheres to the second adhesive surface of the adhesive layer, and
    Equipped with rolls including
    The roll is wound so that the protective film is located outside the optical film.
    Optical film roll.
  2. 　前記保護フィルムは、前記光学フィルム及び前記粘着層よりも伸縮性が低い、
    請求項１に記載の光学フィルムロール。     The protective film has lower elasticity than the optical film and the adhesive layer.
    The optical film roll according to claim 1.
  3. 　前記保護フィルムは、繊維シートを含む、
    請求項２に記載の光学フィルムロール。     The protective film includes a fiber sheet.
    The optical film roll according to claim 2.
  4. 　前記保護フィルムは、複数のフィルム片に分断されている、
    請求項１乃至３のいずれか一項に記載の光学フィルムロール。     The protective film is divided into a plurality of film pieces.
    The optical film roll according to any one of claims 1 to 3.
  5. 　前記粘着層は、互いに隣り合う前記フィルム片の間に配されていない、
    請求項４に記載の光学フィルムロール。     The adhesive layer is not arranged between the film pieces adjacent to each other.
    The optical film roll according to claim 4.
  6. 　前記粘着層は、
    　第１主面及び第２主面を有する基材と、
    　前記第１主面の上に設けられており、前記第１粘着面を構成している第１粘着剤層と、
    　前記第２主面の上に設けられており、前記第２粘着面を構成している第２粘着剤層と、
    を含む、
    請求項１乃至５のいずれか一項に記載の光学フィルムロール。     The adhesive layer is
    A base material having a first main surface and a second main surface,
    A first pressure-sensitive adhesive layer provided on the first main surface and forming the first pressure-sensitive adhesive surface, and a first pressure-sensitive adhesive layer.
    A second adhesive layer provided on the second main surface and forming the second adhesive surface, and a second adhesive layer.
    including,
    The optical film roll according to any one of claims 1 to 5.
  7. 　前記粘着層は、多孔質層を含む、
    請求項１乃至６のいずれか一項に記載の光学フィルムロール。     The adhesive layer includes a porous layer.
    The optical film roll according to any one of claims 1 to 6.
  8. 　前記多孔質層は、樹脂を含む、
    請求項７に記載の光学フィルムロール。     The porous layer contains a resin.
    The optical film roll according to claim 7.
  9. 　前記光学機能面は、複数の凹凸を含む凹凸面により構成されている、
    請求項１乃至８のいずれか一項に記載の光学フィルムロール。     The optical functional surface is composed of an uneven surface including a plurality of uneven surfaces.
    The optical film roll according to any one of claims 1 to 8.
  10. 　前記光学フィルムは、前記凹凸面を構成している複数のプリズム部を含む、
    請求項９に記載の光学フィルムロール。     The optical film includes a plurality of prism portions constituting the uneven surface.
    The optical film roll according to claim 9.
  11. 　前記凹凸面の底部と、前記粘着層との間に空間が形成されている、
    請求項９または１０に記載の光学フィルムロール。     A space is formed between the bottom of the uneven surface and the adhesive layer.
    The optical film roll according to claim 9 or 10.
  12. 　前記粘着層の厚みは、前記凹凸面の隣接する頂部と底部との間の前記粘着層の厚み方向に沿った距離よりも大きい、
    請求項９乃至１１のいずれか一項に記載の光学フィルムロール。     The thickness of the adhesive layer is larger than the distance along the thickness direction of the adhesive layer between the adjacent top and bottom of the uneven surface.
    The optical film roll according to any one of claims 9 to 11.
  13. 　前記光学フィルムは、幅方向に対して垂直な長手方向に沿って巻き取られており、
    　前記粘着層は、
    　前記光学フィルムの前記幅方向における一方端部において、前記長手方向に沿って延びる第１粘着層と、
    　前記光学フィルムの前記幅方向における他方端部において、前記長手方向に沿って延びる第２粘着層と、
    を含む、
    請求項１乃至１２のいずれか一項に記載の光学フィルムロール。     The optical film is wound along a longitudinal direction perpendicular to the width direction.
    The adhesive layer is
    At one end of the optical film in the width direction, a first adhesive layer extending along the longitudinal direction and
    At the other end of the optical film in the width direction, a second adhesive layer extending along the longitudinal direction and
    including,
    The optical film roll according to any one of claims 1 to 12.
  14. 　前記粘着層は、前記幅方向において、前記第１粘着層と前記第２粘着層との間に位置する第３粘着層をさらに含む、
    請求項１３に記載の光学フィルムロール。     The adhesive layer further includes a third adhesive layer located between the first adhesive layer and the second adhesive layer in the width direction.
    The optical film roll according to claim 13.
  15. 　前記光学機能面の前記粘着層が粘着している領域を除く領域に配されたスペーサ層をさらに備える、
    請求項１乃至１４のいずれか一項に記載の光学フィルムロール。     A spacer layer arranged in a region other than the region where the adhesive layer is adhered on the optical functional surface is further provided.
    The optical film roll according to any one of claims 1 to 14.
PCT/JP2020/046215 2019-12-25 2020-12-11 Optical film roll WO2021131773A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011042779A (en) * 2009-07-23 2011-03-03 Nitto Denko Corp Pressure-sensitive adhesive tape
JP2014126822A (en) * 2012-12-27 2014-07-07 Nippon Zeon Co Ltd Method for manufacturing taken-up body of optical film
JP2014139678A (en) * 2011-12-02 2014-07-31 Sharp Corp Laminate
WO2017145718A1 (en) * 2016-02-26 2017-08-31 日本ゼオン株式会社 Long film
WO2018008656A1 (en) * 2016-07-04 2018-01-11 シャープ株式会社 Lighting device, molding die, and method of manufacturing lighting film

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011042779A (en) * 2009-07-23 2011-03-03 Nitto Denko Corp Pressure-sensitive adhesive tape
JP2014139678A (en) * 2011-12-02 2014-07-31 Sharp Corp Laminate
JP2014126822A (en) * 2012-12-27 2014-07-07 Nippon Zeon Co Ltd Method for manufacturing taken-up body of optical film
WO2017145718A1 (en) * 2016-02-26 2017-08-31 日本ゼオン株式会社 Long film
WO2018008656A1 (en) * 2016-07-04 2018-01-11 シャープ株式会社 Lighting device, molding die, and method of manufacturing lighting film

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