TWI631377B - Optical film and manufacturing method thereof - Google Patents

Abstract

The present invention provides an optical film that reduces the occurrence of bumps.

The solution of the present invention is an optical film, which is a polarizing plate and a protective film attached to the surface of the polarizing plate; wherein the polarizing plate includes a polarizer and a protective film laminated on the polarizer; the protective film includes an adhesive layer and a spacer The adhesive layer is laminated on the protective layer of the aforementioned polarizing plate; in the width direction of the optical film, the side end of the protective film is located outside the side end of the polarizer, and the side end of the protective layer is located on the side of the polarizer. The end is more inboard.

Description

   Optical film and manufacturing method thereof   

The present invention relates to an optical film and a method for manufacturing the same.

Conventionally, the optical film is described in Japanese Patent Application Laid-Open No. 2014-102353 (Patent Document 1). The optical film includes a polarizing plate and a protective film attached to a surface of the polarizing plate. The polarizing plate includes a polarizer and a guard film laminated on the polarizer. The protective film includes an adhesive layer and a protective layer laminated on the polarizer through the adhesive layer.

    [Prior technical literature]         [Patent Literature]    

[Patent Document 1] Japanese Patent Laid-Open No. 2014-102353

However, when the aforementioned conventional optical film was actually manufactured and used, the following problems were found. That is, when the optical film is stored or processed, a bulge may be generated between the adhesive layer of the protective film and the protective film of the polarizing plate at the end portion in the width direction of the optical film. If such a bulge is generated, foreign matter intrudes or the like between the protective film and the polarizing plate, resulting in poor display and the like.

Therefore, the inventor of the present case has continued in-depth research on the generation of the bulge, and found that the generation of the bulge is closely related to the position of the lateral ends of the members (polarizer, protective film, adhesive layer, and protective layer) in the width direction of the optical film Related.

Then, the subject of this invention is providing the optical film which reduced the generation | occurrence | production of a bump, and its manufacturing method.

In order to solve the foregoing problems, the optical film of the present invention is an optical film having a polarizing plate and a protective film attached to the surface of the polarizing plate, wherein the polarizing plate includes a polarizer and a protective film laminated on the polarizer, and the aforementioned protection The film includes an adhesive layer and a protective layer laminated on the polarizing plate with the adhesive layer interposed therebetween. In the width direction of the optical film, the side ends of the protective film are located further outside than the side ends of the polarizer. The side end of the protective layer is located at the same position as the side end of the polarizer, or is more inside than the side end of the polarizer.

According to the optical film of the present invention, in the width direction of the optical film, the side end of the protective layer is located at the same position as the side end of the polarizer, or more inward than the side end of the polarizer. Thereby, even if the protective film located outside the side end of the polarizer is greatly changed into a wavy shape due to moisture absorption or the like, the protective film located outside the side end of the polarizer is unlikely to interfere with the protective layer. The bump between the adhesive layer of the protective film and the protective film of the polarizing plate can be reduced.

In addition, the optical film of the present invention is an optical film having a polarizing plate and a protective film attached to a surface of the polarizing plate, wherein the polarizing plate includes a polarizer and a protective film laminated on the polarizer, and the protective film includes An adhesive layer and a protective layer laminated on the polarizing plate through the adhesive layer. In the width direction of the optical film, the side end of the protective film is located further outside than the side end of the polarizer. The protective layer The side end of the protective layer is located further outside the side end of the polarizer, and the side end of the protective layer is located at the same position as the side end of the adhesive layer, or is more outward than the side end of the adhesive layer. The lateral ends of the film are located further outside than the lateral ends of the adhesive layer, and the width dimension L1 between the lateral ends of the protective layer and the lateral ends of the adhesive layer, and the lateral ends of the protective film and the adhesive The ratio L1 / L2 of the width dimension L2 between the side ends of the layers is 0 or more and 0.27 or less.

According to the optical film of the present invention, in the width direction of the optical film, the lateral end of the protective layer is located outside the lateral end of the polarizer, and the width dimension L1 between the lateral end of the protective layer and the lateral end of the adhesive layer is. The ratio L1 / L2 of the width dimension L2 between the side end of the protective film and the side end of the adhesive layer is 0 or more and 0.27 or less. Thereby, the protective film located outside the side end of the polarizer is greatly changed into a wavy shape due to moisture absorption, etc., and the protective film located outside the side end of the polarizer is not easy to interfere with the protective layer. Reduces the occurrence of bumps between the adhesive layer of the protective film and the protective film of the polarizing plate.

In one embodiment of the optical film, the optical film is formed in a blade shape.

According to the aforementioned embodiment, the optical film is formed in a blade shape. At this time, it is also possible to reduce the bulge between the adhesive layer of the protective film and the protective film of the polarizing plate.

In one embodiment of the optical film, the optical film is wound in a roll shape.

According to the aforementioned embodiment, the optical film is wound into a roll shape. At this time, it is also possible to reduce the bulge between the adhesive layer of the protective film and the protective film of the polarizing plate.

Furthermore, in one embodiment of a method for manufacturing an optical film, a method for manufacturing an optical film is a method for manufacturing an optical film having a polarizing plate and a protective film attached to a surface of the polarizing plate, wherein The polarizing plate includes a polarizer and a protective film laminated on the polarizer. The protective film includes an adhesive layer and a protective layer laminated on the polarizer through the adhesive layer. The protective film is provided in the width direction of the optical film to protect the protective film. The side end of the film is located further outside than the side end of the polarizer, so that the side end of the protective layer is located at the same position as the side end of the polarizer, or is located more inside than the side end of the polarizer.

In one embodiment of a method for manufacturing an optical film, a method for manufacturing an optical film is a method for manufacturing an optical film having a polarizing plate and a protective film attached to a surface of the polarizing plate, wherein the polarizing plate includes A polarizer and a protective film laminated on the polarizer. The protective film includes an adhesive layer and a protective layer laminated on the polarizing plate with the adhesive layer interposed therebetween. In the width direction of the optical film, the side of the protective film The end is located outside the side end of the polarizer, so that the side end of the protective layer is located outside the side end of the polarizer, and the side end of the protective layer is located at the same side as the side end of the adhesive layer. Position, or more outside than the side end of the adhesive layer, so that the side end of the protective film is more outside than the side end of the adhesive layer, and the side end of the protective layer and the side end of the adhesive layer The width dimension L1 between them, and the ratio L1 / L2 of the width dimension L2 between the side end of the protective film and the side end of the adhesive layer are set to 0 or more and 0.27 or less.

According to the optical film and the manufacturing method thereof of the present invention, in the width direction of the optical film, since the side end of the protective layer is located at the same position as the side end of the polarizer, or is located more inward than the side end of the polarizer, it can be reduced. The rise of the bulge.

According to the optical film and the manufacturing method thereof of the present invention, in the width direction of the optical film, since the side end of the protective layer is located at the side end of the polarizer Further, the ratio L1 / L2 of the width dimension L1 between the side end of the protective layer and the side end of the adhesive layer and the width dimension L2 between the side end of the protective film and the side end of the adhesive layer is 0. Above 0.27, the occurrence of bumps can be reduced.

1.1A to 1E‧‧‧Optical Film

10‧‧‧ polarizing plate

11‧‧‧ Polaroid

11a‧‧‧side end

12‧‧‧ protective film

12a‧‧‧side end

13‧‧‧ retardation film

13a‧‧‧side end

20‧‧‧ protective film

21‧‧‧Adhesive layer

21a‧‧‧side

22‧‧‧ protective layer

22a‧‧‧side

L1‧‧‧Width dimension between the side end of the protective layer and the side end of the adhesive layer

L2 ‧‧‧ The width dimension between the side end of the protective film and the side end of the adhesive layer

W‧‧‧ Width between the side end of the polarizer and the side end of the adhesive layer

Fig. 1 is a schematic cross-sectional view showing a first embodiment of the optical film of the present invention.

Fig. 2 is an enlarged sectional view of an end portion in the width direction of the optical film.

Fig. 3 is an enlarged cross-sectional view showing a second embodiment of the optical film of the present invention.

Fig. 4 is an enlarged sectional view showing a third embodiment of the optical film of the present invention.

Fig. 5 is an enlarged sectional view showing a fourth embodiment of the optical film of the present invention.

Fig. 6 is an enlarged sectional view showing a fifth embodiment of the optical film of the present invention.

Fig. 7 is an enlarged sectional view showing a sixth embodiment of the optical film of the present invention.

Hereinafter, the present invention will be described in detail based on the embodiment shown in the drawings.

(First Embodiment)

Fig. 1 is a sectional view showing a first embodiment of the optical film of the present invention. As shown in FIG. 1, the optical film 1 includes a polarizing plate 10 and a protective film 20 bonded to the surface of the polarizing plate 10.

The polarizing plate 10 includes a polarizer 11, a guard film 12 laminated on one side of the polarizer 11, and a retardation film 13 laminated on the other side of the polarizer 11. In addition, the retardation film 13 may be omitted. The protective film 20 includes an adhesive layer 21 and a protective layer 22 laminated on the polarizing plate 10 via the adhesive layer 21.

The polarizer 11 is made of, for example, a polyvinyl alcohol resin. The polyvinyl alcohol-based resin is usually obtained by saponifying a polyvinyl acetate-based resin. The saponification degree of the polyvinyl alcohol-based resin is usually 85 mol% or more, preferably 90 mol% or more, and more preferably 99 to 100 mol%. Polyvinyl acetate resins are copolymers of vinyl acetate and other monomers copolymerizable with the vinyl acetate, such as ethylene-vinyl acetate, in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate. Vinyl acetate copolymers and the like. In addition to the above-mentioned ethylene, other copolymerizable monosystems include unsaturated carboxylic acids, olefins other than ethylene, vinyl ethers, and unsaturated sulfonic acids. The degree of polymerization of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably about 1500 to 5,000. The thickness of the polarizer 11 is usually about 1 to 60 μm, and preferably about 5 to 40 μm.

The protective film 12 is made of, for example, cellulose triacetate (TAC) or polyethylene terephthalate (PET). Further, the protective film 12 may have optical characteristics such as a retardation film. The thickness of the protective film 12 is usually about 30 to 100 μm.

The retardation film 13 is made of, for example, a cycloolefin polymer. The retardation film 13 may be omitted, and a protective film may be used instead of the retardation film 13. The thickness of the retardation film 13 is usually about 30 to 100 μm.

The adhesive layer 21 is made of, for example, an acrylic adhesive. The following force is, for example, 0.01 to 0.20 N / 25 mm. The thickness of the adhesive layer 21 is usually about 10 to 20 μm.

The protective layer 22 is made of, for example, cellulose triacetate (TAC) or polyethylene terephthalate (PET). In addition, the protective layer 22 may have optical characteristics, such as a retardation film. The thickness of the protective layer 22 is usually about 30 to 50 μm.

FIG. 2 is a cross-sectional view of an end portion in the width direction of the optical film 1. As shown in FIG. 2, in the width direction of the optical film 1, the side end 12 a of the protective film 12 is located further outside than the side end 11 a of the polarizer 11. The side end 13 a of the retardation film 13 is located further outside than the side end 11 a of the polarizer 11. The side end 22 a of the protective layer 22 is located further inside than the side end 11 a of the polarizer 11. The side end 12a of the protective film 12 and the side end 13a of the retardation film 13 are located at substantially the same position. The side end 22 a of the protective layer 22 is located further inside than the side end 12 a of the protective film 12.

The side end 22 a of the protective layer 22 is located further outside than the side end 21 a of the adhesive layer 21. The side end 12 a of the protective film 12 is located further outside than the side end 21 a of the adhesive layer 21. The width dimension between the side end 22a of the protective layer 22 and the side end 21a of the adhesive layer 21 is set to L1. The width dimension between the side end 12a of the protective film 12 and the side end 21a of the adhesive layer 21 is L2. The width dimension between the side end 11a of the polarizer 11 and the side end 21a of the adhesive layer 21 is W.

As such, the adhesive layer 21 does not exist in the protective layer 22 within the width dimension L1. Within the width dimension L2, there is no adhesive layer 21 in the protective film 12.

Within the width dimensions L1 and L2, with the side end 21a of the adhesive layer 21 as a reference, the side end 22a of the protective layer 22 and the side end 12a of the protective film 12 are located outside of the side end 21a of the adhesive layer 21 The situation is set to a positive number. On the other hand, the case where the side end 22a of the protective layer 22 and the side end 12a of the protective film 12 are located more inward than the side end 21a of the adhesive layer 21 is set to a negative number. In order to suppress contamination of peripheral devices and the optical film 1 due to the exposed end of the adhesive layer 21, the width dimension L1 is usually 0 or more. In addition, in order to protect the end portion of the polarizing plate 11, the side end 12 a of the protective film 12 is generally located outside the side end 11 a of the polarizing plate 11.

In the width dimension W, the side end 21 a of the polarizer 11 is used as a reference, and the case where the side end 21 a of the adhesive layer 21 is positioned further outside than the side end 11 a of the polarizer 11 is set to a positive number. On the other hand, the case where the side end 21a of the adhesive layer 21 is located more inward than the side end 11a of the polarizer 11 is set to a negative number.

In this embodiment, L1 and L2 are positive numbers, and W is a negative number. When the absolute values of L1, L2, and W are compared, | L2 |> | W |> | L1 | holds. Generally, it is 0 <L1 ≦ 15mm, 20mm ≦ L2 ≦ 50mm, and 0 <| W | <25mm with respect to the width of the optical film 1 from 1000 mm to 2500 mm.

In the aforementioned manufacturing method of the optical film 1, the side end 12 a of the protective film 12 is positioned more outward than the side end 11 a of the polarizer 11, and the side end 22 a of the protective layer 22 is positioned more than the side end 11 a of the polarizer 11. Inside, and the optical film 1 is manufactured.

According to the aforementioned optical film 1 and the manufacturing method thereof, the side end 22 a of the protective layer 22 is located further inside than the side end 11 a of the polarizer 11. Thereby, even if the protective film 12 located further outside the side end 11a of the polarizer 11 is largely changed into a wavy shape due to moisture absorption or the like, the protective film 12 located further outside the side end 11a of the polarizer 11 is also It is difficult to interfere with the protective layer 22, and can reduce the occurrence of bulges between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10. In addition, even if the optical film 1 is formed in a leaf shape or rolled into a roll shape, the occurrence of bulges can be reduced.

All in all, the inventor's mechanism for the generation of the bulge is speculated as follows. During storage or processing of the optical film 1, the protective film 12 may change into a wave shape by absorbing moisture. At this time, in the protective film 12 overlapping with the polarizer 11, since the polarizer 11 functions as a bone material, the deformation of the protective film 12 does not occur or becomes small. On the other hand, in the protective film 12 located further outside the side end 11 a of the polarizer 11, there is no polarizer 11 as a bone material, so the deformation of the protective film 12 is greatly increased. Therefore, the greatly increased deformation of the protective film 12 may interfere with the protective layer 22 and cause the protective layer 22 to be stressed in a direction away from the protective film 12. As a result, the adhesive layer 21 is peeled from the protective film 12, and a bulge is generated between the adhesive layer 21 and the protective film 12.

Therefore, the inventor of the present case explores this mechanism, and the side end 22 a of the protective layer 22 is located more inward than the side end 11 a of the polarizer 11, so that the protective film 12 with greatly increased deformation does not easily interfere with the protective layer 22.

(Second Embodiment)

Fig. 3 is a cross-sectional view showing a second embodiment of the optical film of the present invention. The difference between the second embodiment and the first embodiment lies in the positional relationship between the protective layer and the polarizer. This different configuration is explained below. In addition, in the second embodiment, the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and therefore descriptions thereof are omitted.

As shown in FIG. 3, in the optical film 1A, the side end 22 a of the protective layer 22 is located at the same position as the side end 11 a of the polarizer 11. The positional relationship of other members is the same as that of the first embodiment. In this embodiment, L1 and L2 are positive numbers, and W is a negative number. Established | L2 |> | W | = | L1 | established. Generally, it is 0 <L1 ≦ 15mm, 20mm ≦ L2 ≦ 50mm, and 0 <| W | <25mm with respect to the width of the optical film 1 from 1000 mm to 2500 mm.

In the aforementioned manufacturing method of the optical film 1A, the side end 12a of the protective film 12 is positioned further outside than the side end 11a of the polarizer 11 and the side end 22a of the protective layer 22 is positioned the same as the side end 11a of the polarizer 11 1A while manufacturing the optical film.

According to the aforementioned optical film 1A and its manufacturing method, the side end 22 a of the protective layer 22 is located at the same position as the side end 11 a of the polarizer 11. Thereby, even if the protective film 12 located further outside the side end 11a of the polarizer 11 is largely changed into a wavy shape due to moisture absorption or the like, the protective film 12 located further outside the side end 11a of the polarizer 11 is also It is difficult to interfere with the protective layer 22, and can reduce the occurrence of bulges between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10.

(Third Embodiment)

Fig. 4 is a cross-sectional view showing a third embodiment of the optical film of the present invention. The difference between the third embodiment and the first embodiment lies in the positional relationship between the protective layer and the adhesive layer. This different configuration is explained below. In the third embodiment, the same reference numerals as those in the first embodiment denote the same structures as those in the first embodiment, and therefore descriptions thereof will be omitted.

As shown in FIG. 4, in the optical film 1B, the side end 22 a of the protective layer 22 is located at the same position as the side end 21 a of the adhesive layer 21. The positional relationship of other members is the same as that of the first embodiment. In this embodiment, L1 is 0, L2 is a positive number, and W is a negative number. | L2 |> | W | is established. Generally, with respect to the width of the optical film 1 from 1000 mm to 2500 mm, it is 20 mm ≦ L2 ≦ 50 mm, and 0 <| W | <25 mm.

According to the optical film 1B, as in the first embodiment, the side end 22 a of the protective layer 22 is located more inward than the side end 11 a of the polarizer 11, so that the adhesive layer 21 and polarized light of the protective film 20 can be reduced. A bump between the protective films 12 of the plate 10 is generated. In addition, since the side end 22a of the protective layer 22 is located at the same position as the side end 21a of the adhesive layer 21, the width dimension of the protective layer 22 can be reduced, and the material cost of the protective layer 22 can be reduced.

(Fourth Embodiment)

Fig. 5 is a cross-sectional view showing a fourth embodiment of the optical film of the present invention. The difference between the fourth embodiment and the first embodiment lies in the positional relationship between the protective layer, the adhesive layer, and the polarizer. This different configuration is explained below. In addition, in the fourth embodiment, the same reference numerals as those in the first embodiment denote the same structures as those in the first embodiment, and therefore descriptions thereof are omitted.

As shown in FIG. 5, in the optical film 1C, the side end 22 a of the protective layer 22 is located further outside than the side end 11 a of the polarizer 11. The side end 21 a of the adhesive layer 21 is located further outside than the side end 11 a of the polarizer 11. The positional relationship of other members is the same as that of the first embodiment. In this embodiment, L1, L2, and W are positive numbers. | L2 |> | W |> | L1 | is established. The ratio L1 / L2 of the width dimension L1 to the width dimension L2 is 0 or more and 0.27 or less.

In the aforementioned manufacturing method of the optical film 1C, the side end 12 a of the protective film 12 is positioned further outside than the side end 11 a of the polarizer 11, and the side end 22 a of the protective layer 22 is positioned more than the side end 11 a of the polarizer 11. At the outer side, the side end 22a of the protective layer 22 is located more outward than the side end 21a of the adhesive layer 21, and the side end 12a of the protective film 12 is located more outer than the side end 21a of the adhesive layer 21, and the ratio L1 / L2 is set to 0 or more and 0.27 or less, and the optical film 1C is manufactured.

According to the aforementioned optical film 1C and the manufacturing method thereof, the side end 22 a of the protective layer 22 is located further outside than the side end 11 a of the polarizer 11, and the ratio L1 / L2 of the width dimension L1 to the width dimension L2 is 0 or more and 0.27 or less. It is preferably 0.13 or less, and more preferably 0.07 or less. Thereby, even if the protective film 12 located further outside the side end 11a of the polarizer 11 is largely changed into a wavy shape due to moisture absorption or the like, the protective film 12 located further outside the side end 11a of the polarizer 11 is also It is difficult to interfere with the protective layer 22, and can reduce the occurrence of bulges between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10.

All in all, the inventors of the present case explored the mechanism of the bulging described in the first embodiment. Even if the side end 22 a of the protective layer 22 is located further outside than the side end 11 a of the polarizer 11, the protective film 12 is greatly deformed. When it is easy to interfere with the protective layer 22, by setting the ratio L1 / L2 of the width dimension L1 to the width dimension L2 to be 0 or more and 0.27 or less, preferably 0.13 or less, and more preferably 0.07 or less, the deformation is greatly increased. The film 12 still does not easily interfere with the protective layer 22.

(Fifth Embodiment)

Fig. 6 is a sectional view showing a fifth embodiment of the optical film of the present invention. The difference between the fifth embodiment and the fourth embodiment lies in the positional relationship between the protective layer and the adhesive layer. This different configuration is explained below. In addition, in the fifth embodiment, the same reference numerals as those in the fourth embodiment denote the same structures as those in the fourth embodiment, and therefore descriptions thereof are omitted.

As shown in FIG. 6, in the optical film 1D, the side end 22 a of the protective layer 22 is located at the same position as the side end 21 a of the adhesive layer 21. The positional relationship of other members is the same as that of the fourth embodiment. In this embodiment, L1 is 0, L1 / L2 is 0, and L2 and W are positive numbers. | L2 |> | W | is established.

In the aforementioned manufacturing method of the optical film 1D, the side end 12 a of the protective film 12 is positioned further outside than the side end 11 a of the polarizer 11, and the side end 22 a of the protective layer 22 is positioned more than the side end 11 a of the polarizer 11. At the outer side, the side end 22a of the protective layer 22 is located at the same position as the side end 21a of the adhesive layer 21, and the side end 12a of the protective film 12 is located at an outer side than the side end 21a of the adhesive layer 21. Optical film 1D.

According to the optical film 1D and the method for manufacturing the same, as in the fourth embodiment, the side end 22a of the protective layer 22 is located further outside than the side end 11a of the polarizer 11, and L1 / L2 is 0, so it can be reduced. A bulge occurs between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10. In addition, since the side end 22a of the protective layer 22 is located at the same position as the side end 21a of the adhesive layer 21, the width dimension of the protective layer 22 can be reduced, and the material of the protective layer 22 can be reduced.

(Sixth embodiment)

Fig. 7 is a sectional view showing a sixth embodiment of the optical film of the present invention. The difference between the sixth embodiment and the fourth embodiment is the positional relationship between the polarizer and the adhesive layer. This different configuration is explained below. In the sixth embodiment, the same reference numerals as those in the fourth embodiment denote the same configurations as those in the fourth embodiment, and therefore descriptions thereof are omitted.

As shown in FIG. 7, in the optical film 1E, the side end 21 a of the adhesive layer 21 is located more inside than the side end 11 a of the polarizer 11. The positional relationship of other members is the same as that of the fourth embodiment. In this embodiment, L1 and L2 are positive numbers, and W is a negative number. | L2 |> | L1 |> | W | is established. L1 / L2 is 0 or more and 0.27 or less, preferably 0.13 or less, and more preferably 0.07 or less. The sixth embodiment is an example in which | W | is very large, usually | W |> 5, and preferably | W |> 10.

According to the optical film 1E, as in the case of the fourth embodiment, since the side end 22a of the protective layer 22 is located further outside than the side end 11a of the polarizer 11, L1 / L2 is 0 or more and 0.27 or less, and preferably 0.13. Hereinafter, it is more preferably 0.07 or less. Therefore, it is possible to reduce the occurrence of bumps between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10.

In addition, the present invention is not limited to the above-mentioned embodiments, and design changes can be made without departing from the gist of the present invention.

In the aforementioned first to fifth embodiments, it is preferable that the side end 22 a of the protective layer 22 is located at the same position as the side end 21 a of the adhesive layer 21, and W is −5 mm or more and 5 mm or less. Thereby, the width dimension of the protective layer 22 can be reduced, and the material cost of the protective layer 22 can be reduced.

(Example 1)

Next, examples of the first, second, and third embodiments will be described. In Table 1, when the side end 22a of the protective layer 22 is located at the same position as the side end 11a of the polarizer 11 or is located more inside than the side end 11a of the polarizer 11, it indicates that "L1", "L2" "," L1 / L2 "," W "," Generation of bumps ".

The first embodiment corresponds to the third embodiment, the second to fourth embodiments correspond to the first embodiment, and the fifth embodiment corresponds to the second embodiment.

As shown in Table 1, as shown in the first to fifth embodiments, it has nothing to do with L1, L2, and W, as long as the side end 22a of the protective layer 22 is located at the same position as the side end 11a of the polarizer 11, or is located at There is no bulge at the inner side than the side end 11 a of the polarizer 11.

Here, the evaluation method of "the occurrence of a bulge" is demonstrated. The term “bulge” refers to a state where peeling of 1 cm or more occurs in the width direction. After the protective film is attached to the polarizing plate and wound, it is cut into a blade shape of about 700 mm in the MD direction and placed on a flat surface. After standing in a clean room (approximately 22 ° C. 55%) for about 30 minutes, the swelled state of the end of the protective film was evaluated. As long as tunneling occurs, it is determined to be NG (the occurrence of bumps).

(Example 2)

Next, examples of the fourth, fifth, and sixth embodiments will be described. In Table 2, in a state where the side end 22 a of the protective layer 22 is located further outside than the side end 11 a of the polarizer 11, it indicates that “L1”, “L2”, “L1 / L2”, “W”, and “bulge” The result of the "produced".

The sixth embodiment corresponds to the fifth embodiment, the seventh to tenth embodiments correspond to the fourth embodiment, and the eleventh embodiment corresponds to the sixth embodiment.

As shown in Table 2, as shown in the sixth to eleventh embodiments, when the side end 22a of the protective layer 22 is located outside the side end 11a of the polarizer 11, if L1 / L2 is set to 0 or more Below 0.27, no bulge is produced. On the other hand, as shown in the first to twelfth comparative examples, when L1 / L2 is set to be larger than 0.27, a bulge is generated.

Claims (4)

An optical film is a polarizing plate and a protective film adhered to the surface of the polarizing plate, wherein the polarizing plate includes a polarizer and a protective film laminated on the polarizer, and the protective film includes an adhesive layer and a spacer An adhesive layer is laminated on the protective layer of the polarizing plate. In the width direction of the optical film, the lateral end of the protective film is located more outward than the lateral end of the polarizer, and the lateral end of the protective layer is located more than the foregoing. The side end of the polarizer is further outside, the side end of the protective layer is located at the same position as the side end of the adhesive layer, or is more outside than the side end of the adhesive layer, and the side end of the protective film is located Outside the side end of the adhesive layer, the width dimension L1 between the side end of the protective layer and the side end of the adhesive layer is between the side end of the protective film and the side end of the adhesive layer. The ratio L1 / L2 of the width dimension L2 is 0 or more and 0.27 or less. The optical film according to item 1 of the patent application range, wherein the optical film is formed in a leaf shape. The optical film according to item 1 of the scope of patent application, wherein the optical film is wound in a roll shape. An optical film manufacturing method is a method for manufacturing an optical film having a polarizing plate and a protective film adhered to the surface of the polarizing plate, wherein the polarizing plate includes a polarizer and a protective film laminated on the polarizer, and the aforementioned protection The film includes an adhesive layer and a protective layer laminated on the polarizing plate with the adhesive layer interposed therebetween. In the width direction of the optical film, the side end of the protective film is positioned further outside than the side end of the polarizer, so that The side end of the protective layer is located further outside than the side end of the polarizer, so that the side end of the protective layer is located at the same position as the side end of the adhesive layer, or is more outside than the side end of the adhesive layer. So that the lateral end of the protective film is located more outward than the lateral end of the adhesive layer, and the width dimension L1 between the lateral end of the protective layer and the lateral end of the adhesive layer and the lateral end of the protective film The ratio L1 / L2 of the width dimension L2 to the side ends of the adhesive layer is set to 0 or more and 0.27 or less.