TWI766049B - Optical film and manufacturing method thereof - Google Patents

Abstract

The present invention provides an optical film having reduced occurrence of rising.

The optical film of the present invention has a polarizing plate and a protect film laminated on the surface of the polarizing plate; wherein, the polarizing plate includes a polarizer and a guard film laminated on the polarizer; the protect film includes an adhesive layer and a protect layer laminated on the polarizing plate via the adhesive layer; in the width direction of the optical film, the side edge of the guard film is located further outside the side edge of the polarizer, and the side edge of the protect layer is located further inside the side edge of the polarizer.

Description

Optical film and method for producing the same

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

Conventionally, as an optical film system, there exists what is described in Unexamined-Japanese-Patent No. 2014-102353 (patent document 1). The optical film includes a polarizing plate and a protective film attached to the surface of the polarizing plate. The polarizer 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 polarizing plate through the adhesive layer.

[Prior Art Literature] [Patent Literature]

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

However, when the above-mentioned conventional optical film was actually produced and used, the following problems were found. That is, during storage or processing of the optical film, bulges may occur between the adhesive layer of the pellicle film and the protective film of the polarizing plate at the ends in the width direction of the optical film. When this bulge occurs, foreign matter or the like is intruded between the pellicle film and the polarizing plate, resulting in poor display and the like.

Therefore, the inventors of the present application continued to investigate the occurrence of the bulge, and found that the occurrence of the bulge is closely related to the position of the side end of each member (polarizer, protective film, adhesive layer, protective layer) in the width direction of the optical film. related.

Then, the subject of this invention is to provide the optical film which reduces the generation|occurence|production of a bulge, and its manufacturing method.

In order to solve the aforementioned problems, the optical film of the present invention is an optical film comprising a polarizer and a protective film attached to the surface of the polarizer, wherein the polarizer includes a polarizer and a protective film laminated on the polarizer, and the protective film The film comprises an adhesive layer and a protective layer laminated on the polarizer through the adhesive layer. In the width direction of the optical film, the side end of the protective film is located at the outer side than the side end of the polarizer. The side end of the protective layer is located at the same position as the side end of the aforementioned polarizer, or is more inner than the side end of the aforementioned 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 is more inner than the side end of the polarizer. Thereby, even if the protective film located on the outer side of the side end of the polarizer is greatly deformed into a wavy shape due to moisture absorption, etc., the protective film located on the outer side of the side end of the polarizer is not easy to interfere with the protective layer. It can reduce the bulge between the adhesive layer of the protective film and the protective film of the polarizing plate.

In addition, the optical film of the present invention is an optical film having a polarizer and a protective film attached to the surface of the polarizer, wherein the polarizer includes a polarizer and a protective film laminated on the polarizer, and the protective film includes The adhesive layer and the protective layer laminated on the polarizer through the adhesive layer, in the width direction of the optical film, the side end of the protective film is located at the outer side than the side end of the polarizer, the protective layer The side end of the polarizer is located at the outer side of 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 outer than the side end of the adhesive layer. The side end of the film is located at the outer side than 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, and the side end of the protective film and the adhesive layer. 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 side end of the protective layer is located at the outer side of the side end of the polarizer, and the width dimension L1, And the ratio L1/L2 of the width dimension L2 between the side edge of a protective film and the side edge of an adhesive bond layer is 0 or more and 0.27 or less. Thereby, the protective film located on the outer side of the side end of the polarizer is greatly deformed into a wavy shape due to moisture absorption, etc., and the protective film located on the outer side of the side end of the polarizer is not easily disturbed to the protective layer. Reduce the generation of bumps between the adhesive layer of the protective film and the protective film of the polarizing plate.

Moreover, in one Embodiment of an optical film, the said optical film system is formed in the shape of a blade.

According to the aforementioned embodiment, the optical film system is formed into a leaf shape. At this time, the generation of bulges between the adhesive layer of the protective film and the protective film of the polarizing plate can also be reduced.

Moreover, in one Embodiment of an optical film, the said optical film is wound up in roll shape.

According to the aforementioned embodiment, the optical film is wound in a roll shape. At this time, the generation of bulges between the adhesive layer of the protective film and the protective film of the polarizing plate can also be reduced.

Moreover, in one embodiment of the manufacturing method of an optical film, the manufacturing method of an optical film which has a polarizing plate and a protective film attached to the surface of the polarizing plate, wherein the above-mentioned The polarizer 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. In the width direction of the optical film, the protective film is The side end of the film is located more 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 more inner than the side end of the polarizer.

Moreover, in one embodiment of the manufacturing method of an optical film, the manufacturing method of an optical film is the manufacturing method of the 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, the protective film includes an adhesive layer and a protective layer laminated on the polarizer with the adhesive layer interposed therebetween, in the width direction of the optical film, the side of the protective film is The end is located more outside than the side end of the aforementioned polarizer, so that the side end of the aforementioned protective layer is located more outside than the side end of the aforementioned polarizer, so that the side end of the aforementioned protective layer is located at the same side as the side end of the aforementioned adhesive layer. position, or at the outer side than the side end of the aforementioned adhesive layer, so that the side end of the aforementioned protective film is located at the outer side than the aforementioned side end of the aforementioned adhesive agent layer, and the side end of the aforementioned protective layer and the aforementioned side end of the aforementioned adhesive agent layer. The ratio L1/L2 of the width dimension L1 in between and the width dimension L2 between the side edge of the said protective film and the side edge of the said adhesive bond layer shall be 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 more inner than the side end of the polarizer, the reduction of generation of bulge.

更外側處，而防護層的側端與黏著劑層的側端之間的寬度尺寸L1、及保護膜的側端與黏著劑層的側端之間的寬度尺寸L2之比率L1/L2為0以上0.27以下，因此可減低隆起的產生。 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 outside, 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 or less, the generation of bulge can be reduced.

1. 1A to 1E‧‧‧optical film

10‧‧‧Polarizer

11‧‧‧Polarizer

11a‧‧‧Side

12‧‧‧Protective film

12a‧‧‧Side

13‧‧‧Retardation film

13a‧‧‧Side

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

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

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

Fig. 2 is an enlarged cross-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 cross-sectional view showing the third embodiment of the optical film of the present invention.

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

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

Fig. 7 is an enlarged cross-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 embodiments shown in the drawings.

(first embodiment)

Fig. 1 is a cross-sectional view showing the 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 attached to the surface of the polarizing plate 10 .

The polarizer 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-based resin. Polyvinyl alcohol-based resins are usually obtained by saponifying polyvinyl acetate-based resins. The degree of saponification of the polyvinyl alcohol-based resin is usually 85 mol % or more, preferably 90 mol % or more, and more preferably 99 to 100 mol %. In addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, polyvinyl acetate resins include copolymers of vinyl acetate and other monomers that can be copolymerized with the vinyl acetate, such as ethylene- Vinyl acetate copolymer, etc. In addition to the above-mentioned ethylene, other copolymerizable monomer systems include, for example, unsaturated acids, olefins other than ethylene, vinyl ethers, unsaturated sulfonic acids, and the like. The degree of polymerization of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000. The thickness of the polarizer 11 is usually about 1 to 60 m, preferably about 5 to 40 m.

The protective film 12 is made of, for example, triacetate cellulose (TAC) or polyethylene terephthalate (PET). In addition, the protective film 12 may have optical properties like a retardation film, for example. 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. In addition, the retardation film 13 may be omitted, or 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, triacetate cellulose (TAC) or polyethylene terephthalate (PET). In addition, the protective layer 22 may have optical properties such as a retardation film. The thickness of the protective layer 22 is generally 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 outside the side end 11 a of the polarizer 11 . The side end 13 a of the retardation film 13 is located more outside than the side end 11 a of the polarizer 11 . The side end 22 a of the protective layer 22 is located more inward 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 more inward than the side end 12 a of the protective film 12 .

The side end 22a of the protective layer 22 is located more outside than the side end 21a of the adhesive layer 21 . The side end 12 a of the protective film 12 is located more outside than the side end 21 a of the adhesive layer 21 . Let the width dimension between the side end 22a of the protective layer 22 and the side end 21a of the adhesive layer 21 be L1. Let the width dimension between the side edge 12a of the protective film 12 and the side edge 21a of the adhesive layer 21 be L2. Let W be the width dimension between the side edge 11a of the polarizer 11 and the side edge 21a of the adhesive layer 21 .

In this way, within the width dimension L1 , the adhesive layer 21 does not exist in the protective layer 22 . Within the width dimension L2 , the adhesive layer 21 does not exist in the protective film 12 .

Within the width dimensions L1 and L2, with the side end 21a of the adhesive layer 21 as the reference, the side end 22a of the protective layer 22 and the side end 12a of the protective film 12 are located at the outer side of the side end 21a of the adhesive layer 21. Condition 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 assumed to be a negative number. In order to suppress contamination on peripheral equipment and the optical film 1 due to the exposure of the end portion of the adhesive layer 21 , the width dimension L1 is usually 0 or more. Also, in order to protect the end portion of the polarizer 11 , the side end 12 a of the protective film 12 is usually located outside the side end 11 a of the polarizer 11 .

In the width dimension W, with the side end 11a of the polarizer 11 as a reference, the case where the side end 21a of the adhesive layer 21 is located outside the side end 11a of the polarizer 11 is set as 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 assumed to be a negative number.

In this embodiment, L1 and L2 are positive numbers, and W is a negative number. Moreover, when the absolute values of L1, L2, and W are compared, it is established that |L2|>|W|>|L1| is established. Usually, 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 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 further than the side end 11 a of the polarizer 11 . At the inner side, 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 more inward than the side end 11 a of the polarizer 11 . Thereby, even if the protective film 12 located on the outer side of the side end 11a of the polarizer 11 is greatly deformed into a wavy shape due to moisture absorption or the like, the protective film 12 located on the outer side of the side end 11a of the polarizer 11 will not be affected. It is not easy to interfere with the protective layer 22 , which can reduce the bulge 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 into a leaf shape or wound into a roll shape, the occurrence of bulges can be reduced.

In short, the inventors of the present application speculate on the mechanism of the occurrence of the bumps as follows. During storage or processing of the optical film 1, the protective film 12 may be deformed into a corrugated shape by absorbing moisture. At this time, in the protective film 12 overlapping the polarizer 11, since the polarizer 11 functions as an aggregate, the deformation of the protective film 12 does not occur or becomes small. On the other hand, in the protective film 12 located outside the side end 11a of the polarizer 11, since the polarizer 11 as an aggregate does not exist, the deformation of the protective film 12 is greatly increased. Therefore, the protective film 12 with greatly increased deformation will interfere with the protective layer 22 , so that the protective layer 22 is stressed in the direction away from the protective film 12 . As a result, the adhesive layer 21 is peeled off from the protective film 12, and a bulge occurs between the adhesive layer 21 and the protective film 12.

Therefore, the inventors of the present application have investigated the mechanism, and by positioning the side end 22a of the protective layer 22 at the inner side of the side end 11a of the polarizer 11, the protective film 12 with greatly increased deformation is less likely to 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 is the positional relationship between the protective layer and the polarizer. This different configuration is described below. In addition, in the second embodiment, the same reference numerals as those in the first embodiment refer to the same structures as those in the first embodiment, and therefore the description thereof will be 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. It is established that |L2|>|W|=|L1| is established. Usually, 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 more 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 position while fabricating the optical film 1A.

According to the aforementioned optical film 1A and the manufacturing method thereof, 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 on the outer side of the side end 11a of the polarizer 11 is greatly deformed into a wavy shape due to moisture absorption or the like, the protective film 12 located on the outer side of the side end 11a of the polarizer 11 will not be affected. It is not easy to interfere with the protective layer 22 , which can reduce the bulge 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 is the positional relationship between the protective layer and the adhesive layer. This different configuration is described below. In addition, in 3rd Embodiment, the same code|symbol as 1st Embodiment shows the same structure as 1st Embodiment, and a description is abbreviate|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| established. Usually, 20mm≦L2≦50mm, 0<|W|<25mm with respect to the width of 1000mm to 2500mm of the optical film 1 .

According to the optical film 1B, as in the first embodiment, since the side end 22a of the protective layer 22 is located more inward than the side end 11a of the polarizer 11, the adhesive layer 21 of the protective film 20 and the polarized light can be reduced. The bulge between the protective films 12 of the board 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.

(4th embodiment)

Fig. 5 is a cross-sectional view showing a fourth embodiment of the optical film of the present invention. The fourth embodiment differs from the first embodiment in the positional relationship of the protective layer, the adhesive layer, and the polarizer. This different configuration is described below. In addition, in 4th Embodiment, the same code|symbol as 1st Embodiment shows the same structure as 1st Embodiment, and a description is abbreviate|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 more 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| established. Furthermore, 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 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 further than the side end 11a of the polarizer 11 On the outer side, the side end 22a of the protective layer 22 is located at the outer side of the side end 21a of the adhesive layer 21, and the side end 12a of the protective film 12 is located at the outer side of the side end 21a of the adhesive layer 21. L1/L2 was made into 0 or more and 0.27 or less, and the optical film 1C was manufactured.

According to the aforementioned optical film 1C and the manufacturing method thereof, the side end 22a of the protective layer 22 is located at the outer side of the side end 11a 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, Preferably it is 0.13 or less, More preferably, it is 0.07 or less. Thereby, even if the protective film 12 located on the outer side of the side end 11a of the polarizer 11 is greatly deformed into a wavy shape due to moisture absorption or the like, the protective film 12 located on the outer side of the side end 11a of the polarizer 11 will not be affected. It is not easy to interfere with the protective layer 22 , which can reduce the bulge between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10 .

In a word, the inventors of the present application have investigated the mechanism of the bulge generation described in the first embodiment, and even if the side end 22a of the protective layer 22 is located outside the side end 11a of the polarizer 11, the deformation of the protective film 12 is greatly increased. In the case of easily disturbing the protective layer 22, by setting the ratio L1/L2 of the width dimension L1 to the width dimension L2 to 0 or more and 0.27 or less, preferably 0.13 or less, more preferably 0.07 or less, the protection against deformation is greatly increased The membrane 12 still does not easily interfere with the protective layer 22 .

(5th embodiment)

Fig. 6 is a cross-sectional view showing a fifth embodiment of the optical film of the present invention. The difference between the fifth embodiment and the fourth embodiment is the positional relationship between the protective layer and the adhesive layer. This different configuration is described below. In addition, in 5th Embodiment, the same code|symbol as 4th Embodiment shows the same structure as 4th Embodiment, and a description is abbreviate|omitted.

As shown in FIG. 6 , in the optical film 1D, 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 positional relationship of other members is the same as that of the fourth embodiment. In this embodiment, since L1 is 0 and L1/L2 is 0, L2 and W are positive numbers. |L2|>|W| established.

In the aforementioned manufacturing method of the optical film 1D, 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 further than the side end 11a 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 the outer side than the side end 21a of the adhesive layer 21. Optical Film 1D.

According to the optical film 1D and the manufacturing method thereof, as in the fourth embodiment, since the side end 22a of the protective layer 22 is located outside the side end 11a of the polarizer 11, and L1/L2 is 0, it is possible to reduce the Swelling 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 cross-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 described below. In addition, in 6th Embodiment, the same code|symbol as 4th Embodiment shows the same structure as 4th Embodiment, and a description is abbreviate|omitted.

As shown in FIG. 7 , in the optical film 1E, the side end 21 a of the adhesive layer 21 is positioned more inward 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| established. L1/L2 is 0 or more and 0.27 or less, preferably 0.13 or less, more preferably 0.07 or less. Moreover, the sixth embodiment is an example in which |W| is very large, usually |W|>5, preferably |W|>10.

According to the aforementioned optical film 1E, as in the aforementioned fourth embodiment, since the side end 22a of the protective layer 22 is located outside the side end 11a of the polarizer 11, L1/L2 is 0 or more and 0.27 or less, preferably 0.13 Hereinafter, it is more preferably 0.07 or less, so that the occurrence of bulges between the adhesive layer 21 of the protective film 20 and the protective film 12 of the polarizing plate 10 can be reduced.

In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the summary of this invention, a design change is possible.

In the aforementioned first to fifth embodiments, it is preferable that 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 W is -5 mm or more and 5 mm or less. Therefore, 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, in the state where 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 the inner side of the side end 11a of the polarizer 11, it indicates that "L1", "L2" ”, “L1/L2”, “W”, and “Bulge generation” results.

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, regardless of L1, L2, 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 at the same position as the side end 11a of the polarizer 11 There is no bulge at the inner side than the side end 11 a of the polarizer 11 .

Here, the evaluation method of "protrusion generation" will be described. The so-called bulge refers to a state in which peeling of 1 cm or more occurs in the width direction. After attaching the protective film to the polarizing plate and winding, it was cut into a leaf shape of about 700 mm along the MD direction, and placed on a flat surface. After standing in a clean room (about 22°C 55%) for about 30 minutes, the raised state of the end of the pellicle film was evaluated. As long as the tunneling was slightly generated, it was determined as NG (protrusion occurred).

(Example 2)

Next, examples of the fourth, fifth, and sixth embodiments will be described. In Table 2, in the state in which the side end 22a of the protective layer 22 is located at the outer side of the side end 11a of the polarizer 11, "L1", "L2", "L1/L2", "W", "raised" are shown. production" results.

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 occurs. On the other hand, as shown in the first to twelfth comparative examples, when L1/L2 is set to be larger than 0.27, bulging occurs.

1‧‧‧Optical Film

10‧‧‧Polarizer

11‧‧‧Polarizer

11a, 12a, 13a‧‧‧ side end

12‧‧‧Protective film

13‧‧‧Retardation film

20‧‧‧Protective film

21‧‧‧Adhesive layer

21a, 22a‧‧‧ side end

22‧‧‧Protective layer

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

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

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

Claims (4)

An optical film comprising a polarizer and a protective film attached to the surface of the polarizer, wherein the polarizer comprises a polarizer and a protective film laminated on the polarizer, and the protective film comprises an adhesive layer and a protective film separated by the polarizer. The adhesive layer is laminated on the protective layer of the polarizer, in the width direction of the optical film, the side end of the protective film is located at the outer side than the side end of the polarizer, and the side end of the protective layer is located more than the above The side end of the polarizer is more inward. The optical film according to claim 1, wherein the optical film is formed in a leaf shape. The optical film according to claim 1, wherein the optical film is wound in a roll shape. A manufacturing method of an optical film is a manufacturing method of an optical film having a polarizer and a protective film attached to the surface of the polarizer, wherein the polarizer comprises a polarizer and a protective film laminated on the polarizer, and the protective film The film comprises an adhesive layer and a protective layer laminated on the polarizer with the adhesive layer interposed therebetween. In the width direction of the optical film, the side end of the protective film is located more than the side end of the polarizer. At the outer side, the side end of the protective layer is located more inner than the side end of the polarizer.

Images