KR20220081298A - Optical laminate with mark and method of manufacturing the optical laminate with mark - Google Patents

Abstract

[Problem] To provide an optical laminate with a mark in which a reading error is unlikely to occur when reading the mark, a method for manufacturing the same, and a method for inspecting the optical laminate.
[Solutions] A method of manufacturing an optical laminate with a mark includes a step of preparing an optical laminate 100 in which a plurality of optical films 11 to 17 are laminated, and an optical laminate perpendicular to the lamination direction of the optical films ( A step of applying a mark M by irradiating a laser beam LB on the surface of 100) is provided. The optical laminate 100 includes, along a direction perpendicular to the lamination direction of the optical film, a region A having at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm, and 0 gf It has a region B having no interface with an adhesion greater than /25 mm and less than 30 gf/25 mm. In the process of irradiating a laser beam, a laser beam is irradiated to the surface of the area|region B perpendicular|vertical to the lamination direction of an optical film, and the mark M is provided.

Description

Optical laminate with a mark and a method for manufacturing an optical laminate with a mark

The present invention relates to an optical laminate with a mark, a manufacturing method thereof, and the like.

In the optical laminated body which has a some optical film, it is known to provide a mark with a laser beam so that the position in an optical laminated body can be judged accurately in a post process.

Patent Document 1: Japanese Patent Publication No. 2019-512393 Patent Document 2: Japanese Patent No. 5347406 Patent Document 3: Japanese Patent No. 5925609

When a mark is applied to an optical laminated body by a laser beam, a reading error may generate|occur|produce at the time of reading a mark.

This invention was made in view of the said subject, and an object of this invention is to provide the optical laminated body with a mark, and its manufacturing method, and the inspection method of an optical laminated body which are hard to generate|occur|produce a reading error at the time of reading a mark.

As a result of examination by the present inventors, when a mark is applied to the surface of an optical laminated body with a laser beam, bubbles may arise between optical films, and if a bubble arises between optical films, a reading error at the time of reading a mark was found to occur.

Further, as a result of investigation by the present inventors, it has been found that, if the surface of the optical laminate with marks remains exposed to the outside, mark omission or the like occurs during conveyance of the optical laminate, resulting in a reading error at the time of reading the marks. became

A method for manufacturing an optical laminate with a mark according to an aspect of the present invention includes a step of preparing an optical laminate in which a plurality of optical films are laminated;

and applying a mark by irradiating a laser beam to the surface of the optical laminate perpendicular to the lamination direction of the optical film. The optical laminate is, along a direction perpendicular to the lamination direction of the optical film,

a region A having at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm;

In the step of irradiating the laser beam, the region B has a region B that does not have an interface that exceeds 0 gf/25 mm and has an adhesive force of less than 30 gf/25 mm, and the region B is perpendicular to the lamination direction of the optical film. A mark is given by irradiating a laser beam on the surface.

According to the present invention, since the laser beam is irradiated to the surface of the region B while avoiding the region A with the weakly adhesive interface, the generation of air bubbles at the weakly adhesive interface is suppressed.

Here, the region B is

An optical film in which no other optical film is laminated on both sides, and/or;

It is possible to have a laminate of an optical film having only an interface having an adhesive force of 30 gf/25 mm or more.

In the above invention, the laser beam is directed on the surface of the region B perpendicular to the lamination direction of the optical film in a direction perpendicular to the lamination direction of the optical film, from the boundary between the region A and the region B; The above mark can be given by irradiating a position 1 to 20 mm apart.

A method for manufacturing an optical laminate with a mark according to another aspect according to the present invention includes a step of preparing an optical laminate in which a plurality of optical films are laminated;

and applying a mark by irradiating a laser beam to the surface of the optical laminate perpendicular to the lamination direction of the optical film.

The optical laminate has at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm, and one surface of the optical laminate perpendicular to the lamination direction of the optical film; , the distance to each of the interfaces is 80 µm or more, and in the step of irradiating the laser beam, the one surface of the optical laminate is irradiated with a laser beam.

According to the present invention, since the distance between the surface to which the laser beam is irradiated and the weakly-adhesive interface is secured to some extent, the energy of the laser beam at the weakly-adhesive interface is weak, and the generation of bubbles at the interface is suppressed.

In each of the above inventions, the intensity of the laser beam on the surface may be 0.001 J/mm 2 to 0.1 J/mm 2 .

A method of manufacturing an optical laminate with a mark according to another aspect of the present invention includes a step of preparing an optical laminate in which a plurality of optical films are laminated;

A step of imparting a mark by irradiating a laser beam on the surface of the optical laminate perpendicular to the lamination direction of the optical film;

and a step of coating the mark by laminating a protective film on the surface of the optical laminate on which the mark is provided.

According to the present invention, since the marks are coated on the protective film, breakage of the marks during handling of the optical laminate is suppressed.

In each of the above inventions, the optical laminate may have a long shape, and the mark may include information about a position in the longitudinal direction of the optical laminate.

An optical laminate according to an aspect of the present invention includes a plurality of laminated optical films,

The optical laminate is, along a direction perpendicular to the lamination direction of the optical film,

a region A having at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm;

having a region B having no interface with adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm;

A mark by a laser beam is provided on the surface of the region B of the optical laminate perpendicular to the lamination direction of the optical film.

In the invention, the region B is,

An optical film in which no other optical film is laminated on both sides, and/or;

It is possible to have a laminate of an optical film having only an interface having an adhesive force of 30 gf/25 mm or more.

In the invention of the optical laminate, the mark is, on the surface of the region B of the optical laminate perpendicular to the lamination direction of the optical film, the region A in a direction perpendicular to the lamination direction of the optical film and It may be provided at a position away from the boundary of the region B by 1 to 20 mm.

An optical laminate according to another aspect of the present invention includes a plurality of laminated optical films,

The optical laminate has at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm;

A distance between one surface of the optical laminate perpendicular to the lamination direction of the optical film and each of the interfaces is 80 μm or more,

A mark by a laser beam is provided on the one surface of the optical laminate perpendicular to the lamination direction of the optical film.

Here, the optical laminate may have a long shape, and a plurality of marks may be provided to be spaced apart from each other in the longitudinal direction of the optical laminate.

An optical laminate with a protective film according to another aspect of the present invention,

An optical laminate having a plurality of laminated optical films;

a protective film laminated on one surface of the optical laminate perpendicular to the lamination direction of the optical film;

The optical laminate has a mark formed by a laser beam on one surface in the lamination direction of the optical laminate;

The said protective film coat|covers the said mark.

Here, the optical laminate may have a long shape, and a plurality of marks may be provided to be spaced apart from each other in the longitudinal direction of the optical laminate.

A method according to another aspect of the present invention is a method of inspecting defects in the optical laminate or the optical laminate with a protective film,

a step of conveying the optical laminate in the longitudinal direction;

a process of detecting a defect in the conveyed optical laminate;

a step of detecting the mark of the conveyed optical laminate;

a step of acquiring the position of the detected defect in the longitudinal direction of the optical laminate on the basis of the position of the detected mark;

and storing the information on the position in a storage device.

Advantageous Effects of Invention According to the present invention, there are provided an optical laminate that is unlikely to cause a reading error when reading a mark, a method for manufacturing the same, and an inspection method using the same.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the edge part of an example of the optical laminated body which concerns on 1st Embodiment.
It is sectional drawing of the edge part of another example of the optical laminated body which concerns on 1st Embodiment.
It is sectional drawing of the edge part of another example of the optical laminated body which concerns on 1st Embodiment.
It is sectional drawing of the edge part of an example of the optical laminated body which concerns on 1st Embodiment.
It is sectional drawing of the edge part of an example of the optical laminated body which concerns on 2nd Embodiment.
It is sectional drawing of the edge part of an example of the optical laminated body which concerns on 3rd Embodiment.
It is a schematic diagram which shows an example of the inspection method of the optical laminated body which concerns on 4th Embodiment.

EMBODIMENT OF THE INVENTION Embodiment of this invention is described with reference to drawings.

(First embodiment)

With reference to FIGS. 1-4, the manufacturing method of the optical laminated body with a mark which concerns on 1st Embodiment, and the optical laminated body with a mark are demonstrated.

The manufacturing method of the optical laminated body with a mark which concerns on this embodiment, the process of preparing the optical laminated body in which the some optical film was laminated|stacked;

and applying a mark by irradiating a laser beam to the surface of the optical laminate perpendicular to the lamination direction of the optical film.

The optical laminate according to the present embodiment, along a direction perpendicular to the lamination direction of the optical film,

Region A having at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm and an interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm It has region B that does not. And a mark by a laser beam is provided on the surface of the area|region B of the optical laminated body perpendicular|vertical to the lamination|stacking direction of an optical film.

In addition, in this specification, "lamination" means that two layers contact, and the adhesive force between the said two layers exceeds 0 gf/25 mm.

An example of the laminated structure of the optical laminated body 100 (marked optical laminated body 100M) which concerns on this embodiment in FIG. 1 is shown. In Fig. 1, the optical laminate 100 is, in order from the bottom, a protection film 11, an adhesive layer 12, a triacetyl cellulose film 13, an adhesive layer 14, a polyvinyl alcohol-based resin film ( Polarizer layer) 15 , an adhesive bond layer 16 , and a cyclic olefin resin film 17 are provided.

The adhesive force of the interface between the protection film 11 and the pressure-sensitive adhesive layer 12, the adhesion between the triacetyl cellulose film 13 and the adhesive layer 14, the adhesive layer 14 and the polyvinyl alcohol-based resin film 15 The adhesive force of the interface and the adhesive force of the interface of the polyvinyl alcohol-type resin film 15 and the adhesive bond layer 16, and the adhesive force of the interface of the adhesive bond layer 16 and the cyclic olefin resin film 17 are 30 fg/25, respectively, mm or more, suitably 150 gf/25 mm or more. The upper limit of the adhesive force is not particularly limited. The upper limit of the adhesive force may be, for example, 800 gf/25 mm or less.

In this specification, the adhesive force of an interface is a force measured as follows.

One side of the laminate sample is fixed to the surface of soda glass using an acrylic adhesive, the layers constituting the sample are sequentially peeled off, and the load required for peeling is measured to measure the adhesive force of each interface. The measuring method of peeling force is based on JISK6854-2 1999. The width of the evaluation sample is 25 mm, the peel angle is 180°, and the peel rate is 300 mm/min. Peel force is expressed in units of gf/25 mm. Specifically, it can measure using "Autograph AGS-50NX" manufactured by Shimadzu Corporation, for example.

On the other hand, the adhesive force of the interface IF1 of the adhesive layer 12 and the triacetyl cellulose film 13 exceeds 0 gf/25 mm, and is less than 30 gf/25 mm. Specifically, this adhesion may be 3 gf/25 mm to 25 gf/25 mm.

The end surfaces of the protection film 11 and the pressure-sensitive adhesive layer 12 are disposed on the inner side of the end surface of the triacetyl cellulose film 13 , and the lower surface of the triacetyl cellulose film 13 has other layers such as the pressure-sensitive adhesive layer 12 . This non-stacked portion is formed. The end face EF1 of the triacetyl cellulose film 13 is disposed outside the end face EF2 of the pressure-sensitive adhesive layer 12 and the protection film 11, and the width between the end faces EF1 and EF2 is, For example, it can be set as 1 mm - 30 mm.

The end surface EF3 of the adhesive bond layer 14, the polyvinyl alcohol-type resin film 15, the adhesive bond layer 16, and the cyclic olefin resin film 17 is the end surface EF1 of the triacetyl cellulose film 13 ) is disposed on the inner side, the upper surface of the triacetyl cellulose film 13 is formed with a portion where other layers such as the adhesive layer 14 are not laminated. In addition, in FIG. 1, the end surface EF3 of the adhesive bond layer 14, the polyvinyl alcohol-type resin film 15, the adhesive bond layer 16, and the cyclic olefin resin film 17 is the triacetyl cellulose film 13 ), although it is arrange|positioned inside the end surface EF1, you may arrange|position at the same position. The distance between these end surfaces EF1 and EF3 is not limited and may be, for example, 0 mm to 30 mm.

In the optical laminate 100 of FIG. 1, the adhesive force of the interface IF1 between the pressure-sensitive adhesive layer 12 and the triacetyl cellulose film 13 exceeds 0 gf/25 mm and is less than 30 gf/25 mm. , the portion having the interface IF1 in the optical laminate 100 becomes the region A. In addition, the portion having only the triacetyl cellulose film 13 on both sides of the optical laminate 100 on which no other optical films are laminated at all has an adhesive force of greater than 0 gf/25 mm and less than 30 gf/25 mm. Since it does not have an interface, it becomes region B. That is, the optical laminate 100 has a region A and a region B along a direction perpendicular to the lamination direction of the optical film, and the boundary between the region A and the region B is the end of the pressure-sensitive adhesive layer 12 and the protection film 11 . It is a plane BD parallel to the minor surface EF2.

Another example of the optical laminated body 100 which concerns on this embodiment in FIG. 2 is shown. In FIG. 2, the optical laminated body 100 is a triacetyl cellulose film (base material) 21, λ/2 retardation plate 22, ultraviolet curing adhesive layer 23, λ/4 retardation plate in order from the bottom. (24) and a triacetyl cellulose film (25).

The adhesion force of the interface IF2 between the triacetyl cellulose film 21 and the λ/2 retarder 22 and the adhesion force of the interface IF3 between the λ/4 retarder 24 and the triacetylcellulose film 25 are, respectively, greater than 0 gf/25 mm and less than 30 gf/25 mm, suitably between 3 gf/25 mm and 25 gf/25 mm respectively.

On the other hand, the adhesion force of the interface between the λ/2 retardation plate 22 and the ultraviolet curing adhesive layer 23 and the adhesion force of the interface between the ultraviolet curing adhesive layer 23 and the λ/4 retardation plate 24 are 30 gf/25 mm More than that. This adhesion, specifically, may be 150 gf/25 mm or more. The upper limit of the adhesive force is not particularly limited. The upper limit of the adhesive force may be, for example, 800 gf/25 mm or less.

The end surfaces EF4 of the λ/2 retardation plate 22, the ultraviolet curing adhesive layer 23 and the λ/4 retardation plate 24 are the end faces EF5 of the pair of triacetylcellulose films 21 and 25 It does not coincide with, and is disposed on the inner side of the end surfaces EF5 of the pair of triacetyl cellulose films 21 and 25 . The width of the end face EF4 and the end face EF5 can be 1 mm to 30 mm.

In the optical laminate 100 of FIG. 2 , the interface IF2 between the triacetylcellulose film 21 and the λ/2 retarder 22 and the triacetylcellulose film 25 and the λ/4 retarder 24 Since the adhesive force of the interface IF3 is greater than 0 gf/25 mm and less than 30 gf/25 mm, the portion of the optical laminate 100 having the interfaces IF2 and IF3 becomes the region A. In addition, the portion of the optical laminate 100 having only the triacetyl cellulose films 21 and 25 on which no other optical films are laminated on both surfaces exceeds 0 gf/25 mm and has an adhesive force of less than 30 gf/25 mm. It is region B because it does not have an interface with . That is, the optical laminate 100 of FIG. 2 has a region A and a region B along a direction perpendicular to the lamination direction of the optical film, and the boundary between the region A and the region B is a λ/2 retardation plate 22, It is a surface BD parallel to the end surface EF4 of the ultraviolet curing adhesive layer 23 and the λ/4 retardation plate 24 .

In addition, in FIG. 2, in the area|region B, between the triacetyl cellulose films 21 and 25 were spaced apart, they were not laminated|stacked with each other, and the adhesive force is 0 gf/25 mm.

Another example of the optical laminated body 100 which concerns on this embodiment in FIG. 3 is shown. In Fig. 3, the optical laminate 100 is, in order from the bottom, the protection film 31, the pressure-sensitive adhesive layer 32, the triacetyl cellulose film 33, the adhesive layer 34, and the polyvinyl alcohol-based resin film ( 35), the adhesive bond layer 36, and the cyclic olefin resin film 37 are provided.

The adhesion of the interface between the protection film 31 and the pressure-sensitive adhesive layer 32, the adhesion between the triacetyl cellulose film 33 and the adhesive layer 34, the adhesive layer 34 and the polyvinyl alcohol-based resin film 35 The adhesive force of the interface, the adhesive force of the interface of the polyvinyl alcohol-based resin film 35 and the adhesive layer 36, and the adhesive force of the interface of the adhesive layer 36 and the cyclic olefin resin film 37 are all 30 gf/25 more than mm. Their adhesion, specifically, may be 150 gf/25 mm or more. The upper limit of the adhesive force is not particularly limited. The upper limit of the adhesive force may be, for example, 800 gf/25 mm or less.

On the other hand, the adhesive force of the adhesive layer 32 and the triacetyl cellulose film 33 and the interface IF4 of the adhesive layer 32 exceeds 0 gf/25 mm and is less than 30 gf/25 mm, preferably 3 gf/25 mm to 25 gf/25 mm.

The position of the end face EF6 of the adhesive layer 34 , the polyvinyl alcohol-based resin film 35 and the adhesive layer 36 , and the end face EF7 of the triacetyl cellulose film 33 is a protection film 31 . , it does not coincide with the position of the end surface EF8 of the adhesive layer 32 and the cyclic olefin resin film 37, and is arrange|positioned inside rather than the end surface EF8. The distance between the end faces EF8 and EF7 is not limited, and may be, for example, 1 mm to 30 mm. The distance between the end faces EF6 and EF7 can be set to 0 mm to 30 mm.

In FIG. 3 , the end face EF6 of the adhesive layer 34 , the polyvinyl alcohol-based resin film 35 , and the adhesive layer 36 is further inside than the end face EF7 of the triacetyl cellulose film 33 . However, the same position may be used.

In the optical laminate 100 of FIG. 3, the adhesive force of the interface IF4 between the pressure-sensitive adhesive layer 32 and the triacetyl cellulose film 33 exceeds 0 gf/25 mm and is less than 30 gf/25 mm. , the portion having the interface IF4 in the optical laminate 100 becomes the region A. Moreover, the part containing the laminated body of the cyclic olefin resin film 37 and the protection film 31 and the adhesive layer 32 in which other optical films are not laminated|stacked at all on both surfaces of the optical laminated body 100 is 0 gf It is region B because it does not have an interface with adhesion greater than /25 mm and less than 30 gf/25 mm. That is, the optical laminate 100 of FIG. 3 has a region A and a region B along a direction perpendicular to the lamination direction of the optical film, and the region A and the region B are an end face ( It is the plane BD parallel to EF7).

Another example of the optical laminated body 100 which concerns on this embodiment in FIG. 4 is shown. In Fig. 4, the optical laminate 100 is, in order from the bottom, a protection film 71, an adhesive layer 72, a triacetyl cellulose film 73, an adhesive layer 74, and a polyvinyl alcohol-based resin film ( 75), the adhesive bond layer 76, the cyclic olefin resin film 77, the adhesive layer 78, and the peeling film 79 are provided.

The adhesion of the interface between the protection film 71 and the pressure-sensitive adhesive layer 72, the adhesion between the triacetyl cellulose film 73 and the adhesive layer 74, the adhesive layer 74 and the polyvinyl alcohol-based resin film 75 The adhesive force of the interface, the adhesive force of the interface between the polyvinyl alcohol-based resin film 75 and the adhesive layer 76, the adhesive force of the interface between the adhesive layer 76 and the cyclic olefin-based resin film 77, and the cyclic olefin-based resin film 77 ) and the adhesive force at the interface of the pressure-sensitive adhesive layer 78 are all 30 gf/25 mm or more. Their adhesion, specifically, may be 150 gf/25 mm or more. The upper limit of the adhesive force is not particularly limited. The upper limit of the adhesive force may be, for example, 800 f/25 mm or less.

On the other hand, the adhesive force of the interface IF5 between the pressure-sensitive adhesive layer 72 and the triacetyl cellulose film 73 and the adhesive force of the interface IF6 between the pressure-sensitive adhesive layer 78 and the release film 79 exceed 0 gf/25 mm. and less than 30 gf/25 mm, preferably 3 gf/25 mm to 25 gf/25 mm.

The end surface EF9 of the triacetyl cellulose film 73, the cyclic olefin resin film 77, and the adhesive layer 78 is the end surface of the protection film 71, the adhesive layer 72, and the peeling film 79. (EF10) is arranged on the inner side. In addition, the end surfaces EF11 of the adhesive bond layer 74, the polyvinyl alcohol-type resin film 75, and the adhesive bond layer 76 are the triacetyl cellulose film 73, the cyclic olefin resin film 77, and an adhesive layer. It does not coincide with the position of the end surface EF9 of 78, and it is arrange|positioned inside the end surface EF9. The distance between the end faces EF10 and EF9 and the distance between the end faces EF9 and EF11 are not limited, and may be, for example, 1 mm to 30 mm and 0 mm to 30 mm, respectively.

In FIG. 4, the end surface EF10 of the adhesive bond layer 74, the polyvinyl alcohol-type resin film 75, and the adhesive bond layer 76 is the triacetyl cellulose film 73, the cyclic olefin resin film 77, and Although it exists further inside the end surface EFF9 of the adhesive layer 78, the same position may be sufficient.

In the optical laminate 100 of FIG. 4 , the adhesion between the interface IF5 between the pressure-sensitive adhesive layer 72 and the triacetyl cellulose film 73 and the interface IF6 between the pressure-sensitive adhesive layer 78 and the release film 79 is Since it exceeds 0 gf/25 mm and is less than 30 gf/25 mm, the portion of the optical laminate 100 having the interfaces IF5 and IF6 becomes the region A. Moreover, in the part containing the laminated body of the peeling film 79 and the protection film 71 and the adhesive layer 72 in which other optical films are not laminated|stacked at all on both surfaces of the optical laminated body 100, 0 gf/25 mm region B because it does not have an interface that exceeds ? That is, the optical laminated body 100 of FIG. 4 has a region A and a region B along a direction perpendicular to the lamination direction of the optical film, and the region A and the region B are the triacetylcellulose film 73 and the cyclic olefin type. It is the surface BD parallel to the end surface EF9 of the resin film 77 and the adhesive layer 78.

(Aspects of other optical laminates)

Further, in the layer configuration of the optical laminate, the region A exceeds 0 gf/25 mm and has at least one interface having an adhesive force of less than 30 gf/25 mm, the region B exceeds 0 gf/25 mm, and It can be set freely as long as it does not have an interface with an adhesive force of less than 30 gf/25 mm.

Region B may have only one or a plurality of optical films in which no other optical films are laminated on both surfaces, and may have one or more laminates of optical films having only an interface having an adhesive force of 30 gf/25 mm or more, and these may have any combination of

For example, FIG. 1 is an example in which region B has only one optical film on both sides of which other optical films are not laminated at all, and the optical laminate of FIG. It is an example having two, and FIG. 3 and FIG. 4 show that the region B is one optical film (cyclic olefin resin film 37, release film 79) on both sides of which no other optical film is laminated at all, 30 gf / One laminate of a plurality of optical films having only an interface having an adhesive force of 25 mm or more (a laminate of an adhesive layer 32 and a protection film 31, a laminate of an adhesive layer 72 and a protection film 71) This is an example of having both.

In addition to this, the region B may have, for example, one or a plurality of laminates of optical films having only an interface having an adhesive force of 30 gf/25 mm or more.

It is preferable that the area|region B is arrange|positioned outside the area|region A in the direction perpendicular|vertical to the lamination|stacking direction of an optical film, ie, at the edge part of an optical laminated body. When an optical laminated body is elongate shape (raw film), the area|region B may be provided in the edge part of the direction orthogonal to a longitudinal direction.

The width W of the region B (the width perpendicular to the lamination direction of the optical film) is not limited, but may be, for example, 3 mm to 30 mm.

There is no limitation in particular also in the optical film which comprises an optical laminated body.

In this specification, an optical film is a film which can transmit light. The example of an optical film is a resin film, The example of resin is polyvinyl alcohol-type resin, a cellulose resin (triacetyl cellulose etc.), a polyolefin resin (polypropylene resin etc.), a cyclic olefin resin (norbornene type). resins), acrylic resins (polymethyl methacrylate-based resins, etc.), polyester-based resins (polyethylene terephthalate-based resins, etc.), and polyimide-based resins (polyimide, polyamideimide) and the like.

The optical film is a protective film, a release film (adheres to the pressure-sensitive adhesive layer with weak adhesion, and is peeled from the pressure-sensitive adhesive layer when the optical laminate is attached to another member), a protection film (adheres to the pressure-sensitive adhesive layer with strong adhesion, and the pressure-sensitive adhesive layer) It may be peeled from other substrates to be protected together with), a base film, a retardation film, a window film, a polarizer, a retardation plate (λ/2 retardation plate, λ/4 retardation plate, etc.), an adhesive layer, an adhesive layer, and the like.

The thickness of the optical film is not limited, and may be 5 to 300 µm.

The total thickness of the optical laminate 100 is not limited, and may be 10 to 500 μm.

As described above, the optical laminate 100 may be a sheet body, but is preferably a long film (original material). In the case of a long film, the width is not particularly limited and may be 500 mm to 2,000 mm, and the length in the longitudinal direction may be 100 m to 3,000 m.

The adhesive force of the interface between two optical films can be changed easily by the chemical composition of two layers, etc.

Then, the irradiation process of a laser beam is demonstrated.

In the process of irradiating a laser beam, as shown in FIGS. 1-4, the laser beam LB is irradiated to the surface of the area|region B perpendicular|vertical to the lamination direction of an optical film, and the mark M is provided. In the present embodiment, in the region B, the laser beam LB may be irradiated to either surface in the lamination direction. When irradiating a laser beam on the surface, it is suitable to focus the laser beam on the surface.

For example, in the optical laminate of FIG. 1 , as long as it is region B, the laser beam may be irradiated to any of the upper and lower surfaces of the triacetyl cellulose film 13 .

For example, in the optical laminate of FIG. 2 , in the region B, the upper surface of the triacetyl cellulose film 25 may be irradiated with a laser beam, or the lower surface of the triacetyl cellulose film 21 may be irradiated with a laser beam.

For example, in the optical laminate of Fig. 3, if it is region B, the upper surface of the cyclic olefin resin film 37 may be irradiated with a laser beam, or on the lower surface of the laminate of the pressure-sensitive adhesive layer 32 and the protection film 31. You may irradiate a laser beam.

For example, in the optical laminate of FIG. 4 , in the region B, the upper surface of the release film 79 may be irradiated with a laser beam, and the laser beam is applied to the lower surface of the laminate of the pressure-sensitive adhesive layer 72 and the protection film 71 . may be investigated.

Among the regions B, the laser beam LB is directed from the surface of the region B perpendicular to the lamination direction of the optical film in a direction perpendicular to the lamination direction of the optical film, from the plane BD of the boundary between the regions A and B. , it is suitable to apply a mark by irradiating a position 1 mm to 20 mm apart in the direction of region B. More preferably, it is within the range of 1 mm to 10 mm from the boundary surface BD, More preferably, it is within the range of 1 mm to 5 mm from the boundary surface BD.

Moreover, it is suitable to irradiate a laser beam so that the intensity|strength of the laser beam in the surface of area|region B may become 0.001 J/mm<2> - 0.1 J/mm<2>. This strength is more preferably 0.001 J/mm 2 to 0.05 J/mm 2 , still more preferably 0.001 J/mm 2 to 0.01 J/mm 2 .

Irradiation of the laser beam causes formation of a concave portion due to ablation or the like on the surface of the optical film, a change in the properties of the material of the optical film, and the like, thereby forming the mark M. This mark M can be recognized from the outside with a camera or the like. The mark formed by the laser beam may be said to be a recess in the surface of the optical film and/or a location in which the property of the material of the optical film is changed.

It is suitable to provide a plurality of marks M in the region B of the optical laminate. In this case, if the mark M is made different for each place, it is preferable because the position in the longitudinal direction can be recognized based on each mark. In particular, it is suitable to make the character information of the mark M different from each other. For example, by making the character information of the mark M different from each other by making the character information of the mark M a serial number (eg, 0001, 0002, 0003, etc.), the position can be specified by reading the mark becomes

In the case of a long optical laminate, in the region B, it is suitable to form a plurality of marks M with a laser beam along the longitudinal direction. By reading the mark in the post-process, the position in the longitudinal direction can be accurately grasped. For example, a plurality of marks M may be provided at regular intervals along the longitudinal direction. The intervals of the marks M may be provided at irregular intervals instead of at regular intervals.

In addition, the mark M may contain the information regarding the defect in an optical laminated body.

There is no limitation in particular in the character information of a mark, A character string itself may be sufficient, a one-dimensional barcode may be sufficient, and a two-dimensional code may be sufficient.

Although there is no restriction|limiting in particular in the kind of laser, An ultraviolet laser (for example, UV laser) is preferable.

According to the above-mentioned process, the optical laminated body 100M with a mark which has the mark M on one surface of the area|region B is obtained.

According to the present embodiment, since the laser beam LB is irradiated to the surface of the region B while avoiding the region A having the interface with the weak adhesion, the generation of bubbles due to the irradiation of the laser beam at the interface with the weak adhesion is suppressed. do. Therefore, the reading accuracy of the mark in the optical laminated body 100M with a mark can be made high.

(Second embodiment)

With reference to FIG. 5, the manufacturing method of the optical laminated body with a mark which concerns on 2nd Embodiment, and the optical laminated body with a mark are demonstrated. In this embodiment, only the differences from 1st Embodiment are demonstrated, and overlapping description is abbreviate|omitted.

The manufacturing method of the optical laminated body with a mark which concerns on this embodiment, the process of preparing the optical laminated body in which the some optical film was laminated|stacked;

and applying a mark by irradiating a laser beam to the surface of the optical laminate perpendicular to the lamination direction of the optical film.

The optical laminate includes at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm, and one surface of the optical laminate perpendicular to the lamination direction of the optical film; The distance between the interfaces is all 80 µm or more. And in the process of irradiating a laser beam, a laser beam is irradiated to the said one surface of an optical laminated body.

An example of an optical laminated body is shown in FIG. In Fig. 5, the optical laminate 200 is, in order from the bottom, a protection film 41, an adhesive layer 42, a triacetyl cellulose film 43, an adhesive layer 44, a polyvinyl alcohol-based resin film ( 45), the adhesive bond layer 46, and the cyclic olefin resin film 47 are provided.

Adhesion of the interface between the protection film 41 and the pressure-sensitive adhesive layer 42, the adhesion between the triacetyl cellulose film 43 and the adhesive layer 44, the adhesive layer 44 and the polyvinyl alcohol-based resin film 45 The adhesive force of the interface, the adhesive force of the interface between the polyvinyl alcohol-based resin film 45 and the adhesive layer 46, and the adhesive force of the interface of the adhesive layer 46 and the cyclic olefin resin film 47 are all 30 gf/25 more than mm. Their adhesion, specifically, may be 150 gf/25 mm or more. The upper limit of the adhesive force is not particularly limited. The upper limit of the adhesive force may be, for example, 800 gf/25 mm or less.

On the other hand, the adhesive force of the interface IF7 between the pressure-sensitive adhesive layer 42 and the triacetyl cellulose film 43 exceeds 0 gf/25 mm and is less than 30 gf/25 mm, preferably 3 gf/25 mm to 25 mm. gf/25 mm.

The position of the end face EF11 and the adhesive layer 44 of the triacetyl cellulose film 43, the polyvinyl alcohol-based resin film 45, and the end face EF13 of the adhesive layer 46 is a protection film 41 , it does not coincide with the position of the end surface EF12 of the adhesive layer 42 and the cyclic olefin resin film 47, and is arrange|positioned inside rather than the end surface EF12. The distance between the end faces EF11 and EF12 is not limited, but may be, for example, 1 mm to 30 mm. The distance between the end surfaces EF11 and EF13 is also not particularly limited, and may be 0 mm to 30 mm.

In FIG. 5, although the end surface EF11 is inside the end surface EF12, the same position may be sufficient as it. In addition, although the end surface EF13 is inside the end surface EF11, the same position may be sufficient as it.

In this embodiment, the distance D of the one surface (upper surface) of the optical laminated body perpendicular|vertical to the lamination|stacking direction of an optical film, and the said interface IF7 is 80 micrometers or more. As for this distance D, it is suitable to set it as 100 micrometers or more, and it is more suitable to set it as 150 micrometers or more. The upper limit of the distance D is not specifically limited. The upper limit of the distance D may be, for example, 500 µm or less. And in the process of irradiating the laser beam LB, the laser beam LB is irradiated to the said one surface (upper surface) of an optical laminated body.

There is no limitation on the position of the laser beam LB. Since it is desirable to form the mark M where it does not remain in the final product, it is suitable for the position of the laser beam to be an end, for example, an area within 30 mm from the end face of the optical laminate. In FIG. 5 , the laser beam LB may be irradiated to the region A where the interface IF7 exists, or to the region B where the interface IF7 does not exist. In this embodiment, even if the laser beam is irradiated to the area A, there is an effect.

In addition, the layer structure of the optical laminate has at least one interface having an adhesive force exceeding 0 gf/25 mm and less than 30 gf/25 mm, and a distance from at least one surface to each interface is 80 µm or more. As long as it can be set freely.

For example, all the end surfaces of each optical film may be matched with the same position.

Moreover, the optical laminated body may be equipped with two or more interfaces which have adhesive force exceeding 0 gf/25 mm and less than 30 gf/25 mm. Also in that case, the distance between one surface of the said optical laminated body perpendicular|vertical to the lamination|stacking direction of an optical film, and each interface should just be 80 micrometers or more. Preferably, the distance between the one surface and each interface is 100 µm or more, and more preferably 150 µm or more.

Moreover, when the distance between both surfaces and each interface is respectively 80 micrometers or more, Preferably it is 100 micrometers or more, More preferably, when 150 micrometers or more, you may irradiate a laser beam from either surface.

Thereby, the optical laminated body 200M with a mark which has a protective film is obtained.

(action effect)

According to this embodiment, since the distance between the surface to which the laser beam is irradiated and the interface with weak adhesion is secured to some extent, the energy of the laser beam reaching the interface with weak adhesion is weak, and the generation of bubbles at the interface is suppressed.

(Third embodiment)

Then, the manufacturing method of the optical laminated body with a mark which concerns on 3rd Embodiment, and the optical laminated body with a mark which has the protective film obtained by this are demonstrated.

The method according to the present embodiment comprises a step of preparing an optical laminate on which an optical film is laminated;

A process of imparting a mark by irradiating a laser beam to the surface of the optical laminate perpendicular to the lamination direction of the optical film;

The process of laminating|stacking a protective film on the surface to which the said mark of the said optical laminated body was provided is provided.

There is no limitation in the structure of an optical laminated body, For example, the optical laminated body of 1st Embodiment and 2nd Embodiment can be used. In addition, there is no limitation in particular in the adhesive force of the interface in an optical laminated body.

There is no particular limitation on the method of applying the mark by irradiation with a laser beam, and for example, the same method as that of the first and second embodiments can be used. Methods other than those in the first and second embodiments may be employed.

An example of an optical laminated body is shown in FIG. The optical laminated body 50 of this embodiment is, in order from the bottom side, the protection film 51, the adhesive layer 52, the triacetyl cellulose film 53, the adhesive bond layer 54, the polyvinyl alcohol-type resin film ( 55), the adhesive bond layer 56, and the cyclic olefin resin film 57 are provided.

In FIG. 6 , the end face EF15 of the adhesive layer 54 , the polyvinyl alcohol-based resin film 55 , and the adhesive layer 56 is the position of the end face EF14 of the triacetyl cellulose film 53 and The end face EF14 of the triacetyl cellulose film 53 is not aligned and is disposed inside the end face EF14, the protection film 51, the pressure-sensitive adhesive layer 52 and the cyclic olefin resin film 57 of the It does not coincide with the position of the end surface EF15, and it is arrange|positioned rather than the end surface EF15. However, there is no particular limitation on the positional relationship of each end face.

The position of the mark M may be provided at any one position on the surface of any one of the optical laminates 100 perpendicular to the lamination direction of the optical film, but in FIG. 6, it is provided on the lower surface of the protection film 51 have. That is, although the mark M may be provided in the position of 1st Embodiment or 2nd Embodiment, even if it is a position other than these, if it is the surface of the lamination|stacking direction of the optical laminated body 50, this embodiment can be implemented.

In this embodiment, the protective film 60 is laminated|stacked on the surface of the protection film 51 in which the mark M was provided. Here, the protection film 51 may be laminated|stacked so that the mark M may be covered. There is no limitation on the protective film 60, The protective film mentioned above can be used. Thereby, the optical laminated body 300 with a mark which has the protective film 60 is obtained.

It is suitable for the end surface EF16 of the protective film 60 to protrude outward rather than the end surface EF15 of the optical laminated body 50 from a viewpoint of protection of the mark M. The amount of protrusion from the end face EF15 can be set to 20 mm or less. Even if the end surface EF16 does not protrude from the end surface EF15, implementation is possible.

Thereby, the optical laminated body 300 with a mark which has a protective film is obtained.

(action effect)

If the surface to which the mark M of the optical laminate with the mark is given remains exposed to the outside, the mark M comes into contact with other members or the like during transport of the optical laminate, and some or all of the marks are missing, and the An error may occur in the subsequent reading of the mark.

According to this embodiment, the surface of the optical laminated body 50 to which the mark M was provided is covered with the protective film 60, When conveyance of the optical laminated body 50, etc., the mark M comes into contact with another member etc. Thus, the dropout is suppressed. Accordingly, it is possible to suppress the occurrence of a reading error in reading the mark M.

(Fourth embodiment)

In this embodiment, with reference to FIG. 7, one Embodiment of the inspection method of the optical laminated body using the optical laminated body with a mark mentioned above is demonstrated.

(given longitudinal position marks and locate defects)

The system 400 includes a computer 86 , a length measuring device 82 , a laser device 83 , a mark reading camera 84 , a defect detection camera 85 , and a storage device 87 . The length measuring device 82 , the laser device 83 , the mark reading camera 84 , the defect detection camera 85 , and the storage device 87 are connected to the computer 86 . The mark reading camera 84 and the defect detection camera 85 are provided in the adjacent position.

First, the long optical laminated body 100 is conveyed in a longitudinal direction. For example, it is suitable to take out the elongate optical laminated body 100 wound up by the roll 80 from the roll 80, and to convey it planarly between the rolls 89.

Next, the amount of movement in the longitudinal direction of the optical laminate 100 to be conveyed is acquired by the length measuring device 82 . For example, the lengthening device 82 may be a rotary encoder inserted into the conveying roll 81 . Information on the amount of movement in the longitudinal direction is provided to the computer 86 .

Then, whenever the optical laminate 100 moves a predetermined distance in the longitudinal direction, the computer 86 drives the laser device 83 to irradiate the laser beam LB to the optical laminate 100 . Mark (M) is given. It is suitable to give the mark M to the position described in the 1st and 2nd embodiment. Each time the movement amount in the longitudinal direction becomes a predetermined distance, the laser beam is irradiated, so that marks M including different information such as a serial number can be provided in the longitudinal direction. After provision of the mark M, once the optical laminated body is wound up on a roll, you may take out from a roll after that and send it to a post process.

Then, the mark reading camera 84 reads the information of the mark M, and acquires the position of the longitudinal direction in the mark M. For the mark reading camera 84, a barcode sensor or the like can be used.

The defect detection camera 85 acquires the image of the optical laminated body 100 . It is suitable for the defect detection camera 85 to acquire the image of the whole width direction of an optical laminated body. The image sensor provided in the defect detection camera 85 may be a line sensor or an area sensor may be sufficient as it.

The computer 86 detects the presence or absence of the defect DF in the optical laminated body 100 based on the image information acquired by the defect detection camera 85. As shown in FIG. The detection of a defect can be performed using an image processing technique, and various well-known detection algorithms can be used.

The computer 86 generates information regarding the location of the defect DF. Specifically, the information regarding the position of the defect DF is information regarding the position of the width direction of the defect DF, and information regarding the position of the defect DF in the longitudinal direction. The information regarding the position of the width direction of a defect can be acquired based on the image information of the defect detection camera 85. As shown in FIG.

The position in the longitudinal direction of the defect DF is acquired as a position on the basis of any one mark. For example, the time t1 at which the mark reading camera 84 detected the mark M1, the time t2 at which the defect detection camera 85 detected the defect DF, the time obtained by the length measuring device 82 ( Based on the distance traveled by the optical laminate 100 in the longitudinal direction between t1 and t2 and the distance in the longitudinal direction between the detection position of the mark of the mark reading camera 84 and the defect detection camera 85, the mark ( The distance in the longitudinal direction from M1) to the defect DF can be obtained. And the position of the longitudinal direction of the defect DF can be acquired as a combination of the specific mark Mn and the distance from the said mark Mn to the longitudinal direction.

Subsequently, the computer 86 stores the position in the width direction of the defect DF and the position in the longitudinal direction of the defect DF (a combination of the specific mark M and the distance in the longitudinal direction from the mark) in the storage device 87 . ) is stored in

Thereafter, the optical laminate 100 is wound around a roll 89 and stored.

In addition, the method of generating the information regarding the position of the defect DF is not limited to the above, If the position information of a defect is produced|generated using the information based on the mark M, it will not be limited to the above.

When the mark M is covered with a protective film, a protective film may be laminated on the optical laminate after formation of the mark, a protective film may be laminated before detection of a defect, or a protective film may be laminated after detection of a defect .

(Formation of defect marks)

The system 500 includes a computer 95 , a length measuring device 92 , a mark reading camera 93 , a printing device 94 , and a storage device 87 . The length measuring device 92 , the mark reading camera 93 , the printing device 94 and the storage device 87 are connected to the computer 95 . A mark reading camera 93 and a printing device 94 are provided at adjacent positions.

First, the long optical laminated body 100 is conveyed in a longitudinal direction. For example, it is suitable to take out the elongate optical laminated body 100 to which the mark M wound up by the roll 89 was provided from the roll 89, and to convey it planarly between the rolls 98.

Next, the amount of movement in the longitudinal direction of the optical laminate 100 to be conveyed is acquired by the length measuring device 92 at regular time intervals. For example, the lengthening device 92 may be a rotary encoder inserted into the conveying roll 91 . Information on the amount of movement in the longitudinal direction is provided to the computer 95 .

The computer 95 reads, from the storage device 87, defect information, that is, the combination of the position in the width direction and the position in the length direction of the defect DF (a specific mark and the distance in the longitudinal direction from the mark). .

The computer 95 reads the mark M of the optical laminate with the mark reading camera 93, and based on the information stored in the storage device 87, on or near the defect DF, the printing device At (94), a defect mark DM indicating that the defect DF is present is formed. The printing device 94 may be an inkjet printer or a laser marker.

Specifically, as for the computer 95, when the mark reading camera 93 reads the mark M related to defect information, the positional information of the said defect (a position in a width direction and a position in the longitudinal direction from the said mark) Based on this, the printing apparatus 94 is driven at an appropriate timing to give a defect mark DM to the defect DF. Then, the optical laminated body 100 to which the defect mark DM was provided is wound up on the roll 98.

Here, an optical laminated body with a protective film can also be used. In this case, after peeling off the protective film, the marks M can be read and the defect marks DM can be formed. may be formed.

[Example]

A test was conducted on the first embodiment.

(Example 1 and Comparative Example 1)

The optical laminate of FIG. 1 was prepared. Protective film (11), pressure-sensitive adhesive layer (12), triacetyl cellulose film (13), adhesive layer (14), polyvinyl alcohol-based resin film (15), adhesive layer (16) and cyclic olefin-based resin film (17) thicknesses of 50 μm, 15 μm, 30 μm, 0.1 μm, 10 μm, 0.1 μm, and 30 μm, respectively.

The width of region B was 20 mm.

The adhesive force of the interface between the protection film 11 and the pressure-sensitive adhesive layer 12, the adhesion between the triacetyl cellulose film 13 and the adhesive layer 14, the adhesive layer 14 and the polyvinyl alcohol-based resin film 15 The adhesive force of the interface, the adhesive force of the interface between the polyvinyl alcohol-based resin film 15 and the adhesive layer 16, and the adhesive force of the interface between the adhesive layer 16 and the cyclic olefin-based resin film 17 are all 150 gf/25 mm or more and the adhesive force of the interface between the pressure-sensitive adhesive layer 12 and the triacetyl cellulose film 13 was 4.7 gf/25 mm.

A mark M was formed on the surface (upper surface) of the triacetyl cellulose film 13 in the region B of the optical laminate by a laser beam (UV laser, the energy density at the surface was 0.1 J/mm 2 ). Then, when the optical laminated body was observed, generation|occurrence|production of a bubble was not confirmed.

A mark was similarly formed on the surface (lower surface) of the triacetyl cellulose film 13 in the region B of the optical laminate by the laser beam. Then, when the optical laminated body was observed, generation|occurrence|production of a bubble was not confirmed.

A mark was formed on the surface (lower surface) of the protection film 11 in the region A of the optical laminate by a laser beam similarly. When the optical laminate was observed, bubbles were generated between the pressure-sensitive adhesive layer 12 and the triacetyl cellulose film 13 .

(Example 2 and Comparative Example 2)

The optical laminate of FIG. 2 was prepared. The thickness of the triacetyl cellulose film 25, the λ/4 retardation plate 24, the ultraviolet curing adhesive layer 23, the λ/2 retardation plate 22 and the triacetyl cellulose film 21 is 50 μm, 2 μm, 2 μm, 2 μm, and 100 μm.

The width of region B was 20 mm.

The adhesion between the triacetyl cellulose film 25 and the λ/4 retardation plate 24 is 21.7 gf/25 mm, and the interface between the λ/4 retardation plate 24 and the UV curing adhesive layer 23 and the UV curing adhesive layer (23) and the λ/2 retardation plate 22 has an adhesive force of 150 gf/25 mm or more, and an adhesive force between the λ/2 retardation plate 22 and the triacetyl cellulose film 21 is 9.9 gf/25 mm it was

A mark was formed on the surface (upper surface) of the triacetyl cellulose film 25 in the region B of the optical laminate by a laser beam (UV laser, the energy density at the surface was 0.1 J/mm 2 ). Then, when the optical laminated body was observed, generation|occurrence|production of a bubble was not confirmed.

A mark was similarly formed on the surface (lower surface) of the triacetyl cellulose film 21 in the region B of the optical laminate by the laser beam. Then, when the optical laminated body was observed, generation|occurrence|production of a bubble was not confirmed.

A mark was formed on the surface (upper surface) of the triacetyl cellulose film 25 in the region A of the optical laminate by a laser beam similarly. When the optical laminate was observed, bubbles were generated between the triacetyl cellulose film 25 and the λ/4 retardation plate 24 and between the triacetylcellulose film 21 and the λ/2 retardation plate 22 .

A mark was similarly formed on the surface (lower surface) of the triacetyl cellulose film 21 in the region A of the optical laminate by the laser beam. When the optical laminate was observed, the occurrence of air bubbles between the triacetyl cellulose film 25 and the λ/4 retardation plate 24 and between the triacetyl cellulose film 21 and the λ/2 retardation plate 22 was confirmed It didn't happen.

(Example 3 and Comparative Example 3)

The optical laminate of FIG. 3 was prepared. Protective film (31), pressure-sensitive adhesive layer (32), triacetyl cellulose film (33), adhesive layer (34), polyvinyl alcohol-based resin film (35), adhesive layer (36) and cyclic olefin-based resin film (37) thicknesses of 50 μm, 15 μm, 30 μm, 0.1 μm, 10 μm, 0.1 μm, and 30 μm, respectively.

The width of region B was 20 mm.

The adhesion of the interface between the protection film 31 and the pressure-sensitive adhesive layer 32, the adhesion between the triacetyl cellulose film 33 and the adhesive layer 34, the adhesive layer 34 and the polyvinyl alcohol-based resin film 35 The adhesive force of the interface, the adhesive force of the interface between the polyvinyl alcohol-based resin film 35 and the adhesive layer 36, and the adhesive force of the interface of the adhesive layer 36 and the cyclic olefin-based resin film 37 are all 150 gf/25 mm or more and the adhesive force of the interface between the pressure-sensitive adhesive layer 32 and the triacetyl cellulose film 33 was 4.7 gf/25 mm.

A mark was formed on the surface (upper surface) of the cyclic olefin resin film 37 in the region B of the optical laminate by a laser beam (UV laser, the energy density at the surface was 0.1 J/mm 2 ). Then, when the optical laminated body was observed, generation|occurrence|production of a bubble was not confirmed.

A mark was similarly formed on the surface (lower surface) of the protection film 31 in the region B of the optical laminate by the laser beam. Then, when the optical laminated body was observed, generation|occurrence|production of a bubble was not confirmed.

A mark was formed with a laser beam similarly on the surface (upper surface) of the cyclic olefin resin film 37 of the area|region A of the said optical laminated body. When the optical laminate was observed, bubbles were generated between the pressure-sensitive adhesive layer 32 and the triacetyl cellulose film 33 .

A mark was similarly formed on the surface (lower surface) of the protection film 31 in the region A of the optical laminate by the laser beam. When the optical laminate was observed, bubbles were generated between the pressure-sensitive adhesive layer 32 and the triacetyl cellulose film 33 .

(Example 4 and Comparative Example 4)

The optical laminate of FIG. 4 was prepared. Protective film (71), pressure-sensitive adhesive layer (72), triacetyl cellulose film (73), adhesive layer (74), polyvinyl alcohol-based resin film (75), adhesive layer (76), cyclic olefin-based resin film (77) , the thickness of the pressure-sensitive adhesive layer 78 and the release film 79 were 50 μm, 15 μm, 30 μm, 0.1 μm, 10 μm, 0.1 μm, 30 μm, 30 μm, and 40 μm, respectively.

The width of region B was 20 mm.

The adhesion of the interface between the protection film 71 and the pressure-sensitive adhesive layer 72, the adhesion between the triacetyl cellulose film 73 and the adhesive layer 74, the adhesive layer 74 and the polyvinyl alcohol-based resin film 75 The adhesive force of the interface, the adhesive force of the interface of the polyvinyl alcohol-type resin film 75 and the adhesive bond layer 76, the adhesive force of the interface of the adhesive bond layer 76 and the cyclic olefin resin film 77, the cyclic olefin resin film 77 ) and the adhesive layer 78 have an adhesive force of 150 gf/25 mm or more, and the adhesive layer 72 and the triacetyl cellulose film 73 have an adhesive force of 4.7 gf/25 mm and an adhesive layer 78. The adhesive force at the interface of the peeling film 79 was 5.8 gf/25 mm.

A mark was formed on the surface (upper surface) of the release film 79 in the region B of the optical laminate by a laser beam (UV laser, the energy density at the surface was 0.1 J/mm 2 ). Then, when the optical laminated body was observed, generation|occurrence|production of a bubble was not confirmed.

A mark was similarly formed on the surface (lower surface) of the protection film 71 in the region B of the optical laminate by the laser beam. Then, when the optical laminated body was observed, generation|occurrence|production of a bubble was not confirmed.

A mark was similarly formed on the surface (upper surface) of the release film 79 in the region A of the optical laminate by the laser beam. When the optical laminate was observed, bubbles were generated between the pressure-sensitive adhesive layer 78 and the release film 79 .

A mark was similarly formed on the surface (lower surface) of the protection film 71 in the region A of the optical laminate by the laser beam. When the optical laminate was observed, bubbles were generated between the pressure-sensitive adhesive layer 72 and the triacetyl cellulose film 73 .

(Measurement of adhesion force at the interface)

In this Example, the adhesive force of the interface was measured as follows.

One side of the laminate sample was fixed to the surface of soda glass using an acrylic adhesive, the layers constituting the sample were peeled off in order, and the peeling force of each interface was measured. The measuring method of peeling force was based on JISK6854-2 1999. The width of the evaluation sample was 25 mm, the peeling angle was 180°, and the peeling rate was 300 mm/min. Peeling force was measured using "Autograph AGS-50NX" manufactured by Shimadzu Corporation.

11-17… Optical film, 21-25... Optical film, 31-37... Optical film, 41-47... optical film, 50... Optical laminates, 51 to 57... optical film, 60... protective film, 71 to 79... optical film, 100, 200... Optical laminate, 100M, 200M... Marked optical laminate, 300... Optical laminate with protective film, LB... Laser beam, M… Mark.

Claims (15)

A step of preparing an optical laminate on which a plurality of optical films are laminated;
A method of manufacturing an optical laminate with a mark, comprising the step of imparting a mark by irradiating a laser beam to the surface of the optical laminate perpendicular to the lamination direction of the optical film,
The optical laminate is, along a direction perpendicular to the lamination direction of the optical film,
a region A having at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm;
having a region B having no interface with adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm;
In the step of irradiating the laser beam, a laser beam is irradiated to the surface of the region B perpendicular to the lamination direction of the optical film to impart a mark. According to claim 1, wherein the region B,
An optical film in which no other optical film is laminated on both sides, and/or;
A manufacturing method having a laminate of an optical film having only an interface having an adhesive force of 30 gf/25 mm or more. The region A and the region according to claim 1 or 2, wherein the laser beam is directed to the region A and the region in a direction perpendicular to the lamination direction of the optical film on the surface of the region B perpendicular to the lamination direction of the optical film A manufacturing method in which the mark is imparted by irradiating a position 1 to 20 mm away from the boundary of B. A step of preparing an optical laminate on which a plurality of optical films are laminated;
A method of manufacturing an optical laminate with a mark, comprising the step of imparting a mark by irradiating a laser beam to the surface of the optical laminate perpendicular to the lamination direction of the optical film,
The optical laminate has at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm;
A distance between one surface of the optical laminate perpendicular to the lamination direction of the optical film and each of the interfaces is 80 μm or more,
In the process of irradiating the said laser beam, the manufacturing method of the optical laminated body with a mark which irradiates a laser beam to the said one surface of the said optical laminated body. The manufacturing method according to any one of claims 1 to 4, wherein the intensity of the laser beam at the surface is 0.001 J/mm 2 to 0.1 J/mm 2 . A step of preparing an optical laminate on which a plurality of optical films are laminated;
A step of imparting a mark by irradiating a laser beam on the surface of the optical laminate perpendicular to the lamination direction of the optical film;
and a step of coating the mark by laminating a protective film on the marked surface of the optical laminate. The manufacturing method according to any one of claims 1 to 6, wherein the optical laminate has a long shape, and the mark contains information about a position in the longitudinal direction of the optical laminate. An optical laminate comprising a plurality of laminated optical films, comprising:
The optical laminate is, along a direction perpendicular to the lamination direction of the optical film,
a region A having at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm;
having a region B having no interface with adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm;
A mark by a laser beam is imparted to the surface of the region B of the optical laminate, which is perpendicular to the lamination direction of the optical film. According to claim 8, wherein the region B,
An optical film in which no other optical film is laminated on both sides, and/or;
An optical laminate having a laminate of an optical film having only an interface having an adhesive force of 30 gf/25 mm or more. 10. The method of claim 8 or 9, wherein the mark is, on the surface of the region B of the optical laminate perpendicular to the lamination direction of the optical film, the region A in a direction perpendicular to the lamination direction of the optical film and an optical laminate provided at a position away from the boundary of the region B by 1 to 20 mm. An optical laminate comprising a plurality of laminated optical films, comprising:
The optical laminate has at least one interface having an adhesion greater than 0 gf/25 mm and less than 30 gf/25 mm;
A distance between one surface of the optical laminate perpendicular to the lamination direction of the optical film and each of the interfaces is 80 μm or more,
The optical laminated body which the mark by a laser beam was provided to the said one surface of the said optical laminated body perpendicular|vertical to the lamination|stacking direction of the said optical film. The optical laminate according to any one of claims 8 to 11, wherein the optical laminate has a long shape, and a plurality of the marks are provided while being spaced apart in the longitudinal direction of the optical laminate. An optical laminate having a plurality of laminated optical films, and
a protective film laminated on one surface of the optical laminate perpendicular to the lamination direction of the optical film;
The optical laminate has a mark formed by a laser beam on one surface in the lamination direction of the optical laminate;
The said protective film coat|covers the said mark, The optical laminated body with a protective film. The optical laminate with a protective film according to claim 13, wherein the optical laminate has a long shape, and a plurality of marks are provided spaced apart in the longitudinal direction of the optical laminate. A method of inspecting the defect in the optical laminate according to claim 12 or the optical laminate according to claim 14, comprising:
a step of conveying the optical laminate in the longitudinal direction;
a process of detecting a defect in the conveyed optical laminate;
a step of detecting the mark of the conveyed optical laminate;
a step of acquiring the position of the detected defect in the longitudinal direction of the optical laminate on the basis of the position of the detected mark;
and storing the information about the position in a storage device.

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