Optical laminate roll
阅读说明:本技术 光学层叠体辊 (Optical laminate roll ) 是由 川满昇一 村重毅 稻垣淳一 宫武稔 原和孝 宫本诚 于 2019-01-23 设计创作,主要内容包括:本发明涉及包含玻璃层的长尺寸的光学层叠体的辊状卷绕体。在光学层叠体辊中,光学层叠体具备柔性玻璃层(10)、偏光片(30)及粘合剂层(80)。玻璃层的厚度优选为150μm以下。光学层叠体辊的长度优选为100m以上。光学层叠体在玻璃层的第一主面上也可以依次具备偏光片及粘合剂层。在玻璃层和偏光片之间也可以设置有透明膜。(The present invention relates to a roll-shaped wound body of a long optical laminate including a glass layer. In the optical laminate roll, the optical laminate is provided with a flexible glass layer (10), a polarizer (30), and an adhesive layer (80). The thickness of the glass layer is preferably 150 μm or less. The length of the optical laminate roll is preferably 100m or more. The optical laminate may include a polarizer and a pressure-sensitive adhesive layer in this order on the first main surface of the glass layer. A transparent film may also be disposed between the glass layer and the polarizer.)
1. An optical laminate roll which is a roll of a long optical laminate, wherein,
the optical laminate comprises a flexible glass layer, a polarizer and an adhesive layer,
the thickness of the glass layer is less than 150 μm,
the length is more than 100 m.
2. The optical stack roll of claim 1,
the thickness of the polaroid is 3-25 mu m.
3. The optical stack roll of claim 1 or 2,
the thickness of the adhesive layer is 10-30 mu m.
4. The optical stack roll according to any one of claims 1 to 3,
at least one of the polarizer and the adhesive layer has a width larger than that of the glass layer and protrudes from both ends of the glass layer in the width direction.
5. The optical stack roll according to any one of claims 1 to 4,
and a separator is temporarily adhered to the surface of the adhesive layer.
6. The optical stack roll of claim 5,
the thickness of the diaphragm is 10-60 mu m.
7. The optical stack roll of claim 5 or 6,
the separator has a width larger than that of the glass layer and protrudes from both ends in the width direction of the glass layer.
8. The optical stack roll according to any one of claims 1 to 7,
the optical laminate includes the polarizer and the adhesive layer in this order on the first main surface of the glass layer.
9. The optical stack roll of claim 8,
and a first transparent film is arranged between the glass layer and the polarizer.
10. The optical stack roll of claim 9,
the glass layer and the transparent film are bonded to each other via an adhesive layer.
11. The optical stack roll of claim 10,
the adhesive layer has a thickness of 10 [ mu ] m or less.
12. The optical stack roll according to any one of claims 9 to 11,
the first transparent film is a slant extending lambda/4 plate.
13. The optical stack roll according to any one of claims 9 to 11,
the first transparent film is an optically isotropic film.
14. The optical stack roll according to any one of claims 9 to 13,
the first transparent film is wider than the glass layer and protrudes from both ends in the width direction of the glass layer.
15. The optical stack roll according to any one of claims 8 to 14,
a second transparent film is further provided between the polarizer and the adhesive layer.
16. The optical stack roll of claim 15,
the second transparent film is an optically anisotropic element.
17. The optical stack roll of claim 16,
the optically anisotropic element comprises a tilt-extended λ/4 plate.
18. The optical stack roll of claim 16 or 17,
the optically anisotropic element includes two or more layers having different optical anisotropies.
19. The optical stack roll according to any one of claims 15 to 18,
the second transparent film is wider than the glass layer and protrudes from both ends in the width direction of the glass layer.
20. The optical stack roll according to any one of claims 8 to 19,
the second main surface of the glass layer is provided with an antireflection layer.
21. The optical stack roll according to any one of claims 8 to 20,
the second main surface of the glass layer is provided with an antifouling layer.
22. The optical stack roll according to any one of claims 8 to 21,
the glass layer is provided with an antistatic layer on the first main surface or the second main surface.
23. The optical stack roll according to any one of claims 8 to 22,
and an easy-bonding layer is arranged on any one surface of the polarizer, the first transparent film and the second transparent film.
24. The optical stack roll according to any one of claims 8 to 23,
further comprises a light diffusion layer.
25. The optical stack roll of any one of claims 8-24,
and a surface protective film is temporarily adhered to the second main surface of the glass layer.
26. The optical stack roll of claim 25,
the thickness of the surface protection film is 40-200 mu m.
27. The optical stack roll of any one of claims 8-26,
and an anti-crack expansion unit is arranged on the second main surface of the glass layer.
28. The optical stack roll of claim 27,
the crack propagation preventing means includes a resin film and an adhesive layer, and the adhesive layer is bonded to the second main surface of the glass layer.
29. The optical stack roll of claim 27 or 28,
the crack propagation preventing means is provided at or near both ends in the width direction of the optical layered body.
30. The optical stack roll of claim 8,
the second main surface of the glass layer is further provided with a first transparent film.
31. The optical stack roll of claim 30,
the first transparent film is wider than the glass layer and protrudes from both ends in the width direction of the glass layer.
32. The optical stack roll according to any one of claims 1 to 7,
the optical laminate is provided with the adhesive layer on a first main surface of the glass layer and the polarizer on a second main surface of the glass layer.
Technical Field
The present invention relates to a roll of long length optical laminates comprising a flexible glass layer.
Background
Display devices including liquid crystal display elements or organic EL elements are becoming lighter and thinner. In addition to these requirements, in information terminals such as smartphones and tablet PCs, there is an increasing demand for improved impact resistance, and in many cases, a transparent protective material (front window) is disposed on the surface of the display region.
As the protective material, a glass plate or a plastic plate is used. The glass plate has high hardness and is suitable for impact resistance of devices. Further, since glass has high transparency and a surface light, it is possible to realize high visibility with glare by using a glass plate as a front window. However, since glass has a high specific gravity, it hinders weight reduction of the device. Although plastic plates are lighter than glass plates, it is difficult to achieve high impact resistance and transparency as glass.
Patent document 1 proposes a method of using a glass layer having flexibility for a front window of an image display device to achieve both weight reduction and impact resistance of the device.
Disclosure of Invention
Problems to be solved by the invention
Since the glass layer having flexibility can be applied to a roll-to-roll process, it can be expected to contribute to improvement in productivity in addition to weight reduction of the device. Further, by using an optical laminate in which a flexible glass layer and a polarizer are laminated in advance, it is also possible to realize the attachment of the polarizer to the image display unit and the attachment of the front window to the surface of the image display device by one-time attachment.
However, the flexible glass layer is easily damaged by bending, and an optical laminate including a long flexible glass layer cannot be obtained at present, and the practical findings thereof are insufficient.
Means for solving the problems
The present invention relates to an optical laminate roll comprising a flexible glass layer and a polarizer. The length of the optical laminate constituting the roller is preferably 100m or more.
The optical laminate comprises a flexible glass layer, a polarizer and an adhesive layer. The separator may be temporarily bonded to the surface of the adhesive layer. The optical stack may further comprise a transparent film. The thickness of the glass layer is preferably 150 μm or less.
In the optical laminate roll according to the first embodiment of the present invention, the optical laminate includes the polarizer and the adhesive layer in this order on the first main surface of the glass layer. A transparent film may also be disposed between the glass layer and the polarizer. As the transparent film, an optically anisotropic film such as a obliquely-stretched λ/4 plate may be used. The transparent film may also be an optically isotropic film.
An optically isotropic or anisotropic transparent film may also be disposed between the polarizer and the adhesive layer. The transparent film provided between the polarizer and the adhesive layer may have functions of preventing reflection of external light in the organic EL display device, securing the optical quality of the liquid crystal display device, and the like.
In the optical laminate roll according to the second embodiment of the present invention, the optical laminate includes the adhesive layer on the first main surface of the glass layer, and the polarizer on the second main surface of the glass layer.
In the optical laminate roll according to the third embodiment of the present invention, the optical laminate includes the polarizer and the adhesive layer on the first main surface of the glass layer, and includes the transparent film on the second main surface of the glass layer.
The optical laminate may include a function-imparting layer such as an antireflection layer, an antifouling layer, an antistatic layer, and an easy-adhesion layer. A surface protective film may be temporarily bonded to the second main surface of the glass layer.
In the optical laminate, the width of the glass layer and the width of the resin film (polarizer, surface protective film, separator, etc.) laminated on the glass layer may be the same or different. The width of at least one resin film laminated on the glass layer is larger than the width of the glass layer, and the resin film may be provided so as to protrude from both ends in the width direction of the glass layer. The width of the adhesive layer laminated on the glass layer is larger than the width of the glass layer, and the adhesive layer may be provided so as to protrude from both ends in the width direction of the glass layer. When a film, an adhesive layer, or the like laminated with the glass layer is provided so as to protrude from both ends in the width direction of the glass layer, the end face of the glass layer is positioned inside the end face of the optical laminate roll, and therefore physical contact with the end face of the glass layer is restricted, and breakage of the glass layer from the end face can be suppressed.
The surface of the glass layer can also be provided with a crack propagation prevention unit. As the crack-preventing spreading means, a tape or the like provided with a resin film and an adhesive layer is used. For example, by attaching a tape as the crack expansion preventing means to both ends in the width direction or the vicinity of both ends in the width direction of the optical laminate, breakage of the glass layer is suppressed, and a long optical laminate can be stably obtained.
Effects of the invention
By using the optical laminate roll of the present invention, an image display device having excellent impact resistance can be manufactured with high production efficiency.
Drawings
Fig. 1 is a cross-sectional view showing an example of a laminated structure of an optical laminate.
Fig. 2 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 3 is a cross-sectional view showing an example of the configuration of an image display device including an optical laminate.
Fig. 4 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 5 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 6A is a top view of an optical laminate having a decorative print.
Fig. 6B is a cross-sectional view of an optical laminate with a decorative print.
Fig. 7 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 8 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 9 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 10A is a plan view of a long glass layer having a strip provided on the surface thereof.
Fig. 10B is a cross-sectional view of the long glass layer provided with the ribbon on the surface.
Fig. 11 is a cross-sectional view showing an example of a lamination configuration of an optical laminate having a tape provided on the surface thereof.
Fig. 12 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 13 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 14 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 15 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 16 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 17 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 18 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 19 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 20 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 21 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 22 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 23 is a cross-sectional view showing an example of a laminated structure of the optical laminate.
Fig. 24 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 25 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 26 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 27 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 28 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 29 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Fig. 30 is a cross-sectional view showing an example of the laminated structure of the optical laminate.
Detailed Description
The optical laminate roll of the present invention is a roll of an optical laminate having a long dimension of 100m or more in length. The length of the optical laminate is preferably 300m or more, more preferably 500m or more, and still more preferably 700m or more. The width of the optical laminate is, for example, 50 to 3000mm, preferably 10 to 2000 mm. The optical laminate comprises a flexible glass layer, a polarizer and an adhesive layer.
[ first embodiment ]
In the optical laminate roll according to the first embodiment of the present invention, a glass layer is disposed on one main surface of the laminate, and an adhesive layer is disposed on the other main surface. A polarizer is disposed between the glass layer and the adhesive layer.
Fig. 1 is a cross-sectional view showing an example of a laminated structure of an optical laminate according to a first embodiment. The
A
Fig. 3 is a schematic cross-sectional view of an image display device including an optical layered body. The image display device 501 includes an optical laminate 201 on the viewing side surface of the image display unit 1. Examples of the image display unit include a liquid crystal unit and an organic EL unit.
The optical laminate 201 is a member obtained by peeling and removing the separator temporarily bonded to the pressure-
< glass layer >
The
In order to maintain flexibility, the thickness of the
The
The method for forming the glass layer is not particularly limited, and any appropriate method can be used. For example, a mixture containing a main raw material such as silica or alumina, an antifoaming agent such as mirabilite or antimony oxide, and a reducing agent such as carbon is melted at a temperature of 1400 to 1600 ℃, formed into a sheet shape, and then cooled to produce a glass layer. Examples of the method for forming the glass into a sheet include a slot down draw method, a fusion method, a float method, and the like. In order to achieve thinning, smoothing, or the like, the glass formed into a sheet shape may be subjected to chemical treatment with a solvent such as hydrofluoric acid as necessary.
As the
< polarizing plate >
As the
As the
Among these polarizers, a polyvinyl alcohol (PVA) polarizer is preferably used in which a dichroic material such as iodine or a dichroic dye is adsorbed to a polyvinyl alcohol film such as polyvinyl alcohol or partially formalized polyvinyl alcohol and oriented in a predetermined direction because of its high degree of polarization. For example, a PVA-based polarizer can be obtained by subjecting a PVA-based film to iodine dyeing and stretching.
The thickness of the
Thin polarizers are described in, for example, Japanese patent laid-open publication No. Sho 51-069644, Japanese patent laid-open publication No. 2000-338329, booklets of WO2010/100917, Japanese patent No. 4691205, Japanese patent No. 4751481, and the like. Such a thin polarizer is obtained by a production method including, for example, a step of stretching a PVA-based resin layer and a stretching resin substrate in a laminated state and a step of iodine dyeing.
< first transparent film >
The
The
In one embodiment, as a material of the first transparent film disposed between the
The thickness of the
The
In the case where the
In the
The retardation in plane at a wavelength of 550nm of the lambda/4 plate is 100nm to 180nm, preferably 110nm to 170nm, and more preferably 120nm to 160 nm. The angle formed by the slow axis direction of the lambda/4 plate and the absorption axis direction of the
In the case where the λ/4 plate as the
As shown in fig. 4, the optical laminate may also have two
By laminating a plurality of transparent films, various optically anisotropic elements having optical anisotropy can be obtained. For example, wavelength dispersion of a transparent film can be adjusted by laminating films having different retardation amounts of wavelength dispersion so that the optical axis directions are orthogonal to each other (for example, japanese patent laid-open No. 5-27118). Further, wavelength dispersion can also be adjusted by laminating films (for example, λ/2 plates and λ/4 plates) having different retardation amounts so that the optical axes are not parallel (for example, japanese patent laid-open No. h 10-68816).
The amount of change in retardation due to the viewing angle can also be adjusted by laminating films having different refractive index anisotropy. For example, by laminating a positive a plate (nx > ny ≈ nz) and a positive C plate (nz > nx ≈ ny), an optical anisotropic element having a refractive index of nx > nz > ny can be obtained in which a change in retardation amount accompanying a change in the viewing angle is small.
The first transparent film provided between the
The optical laminate may not include a transparent film between the
< adhesive layer >
The
In the case where the image display unit 1 is an organic EL unit, the pressure-
The
< separator >
The
The thickness of the
< surface protective film >
As shown in fig. 2, a surface
The surface
As a material of the surface
The thickness of the
< decorative printing section >
The optical laminate may also include a decorative printed portion. Fig. 6A is a plan view showing an embodiment of an optical laminate having the decorative printed portion 15, and fig. 6B is a cross-sectional view in the width direction. In the optical laminate 113, a frame-like decoration print is applied to the surface of the
In the optical laminate on which the frame-shaped decorative printing shown in fig. 6A is performed, one frame-shaped region corresponds to the size of one image display device. In the image display device, if the area subjected to the decorative printing is disposed at the periphery of the screen, the lead-out wiring and the like cannot be recognized from the outside, and therefore, the improvement of the appearance is contributed. In addition to the purpose of light shielding of the peripheral portion of the screen, a decorative printed portion may be provided for the purpose of specifying the position of a switch or the like or decoration.
The decorative printing portion has a printing thickness of, for example, about 5 to 100 μm. An adhesive layer or an adhesive layer (not shown) may be provided between the
The decoration printing portion may be provided on either surface of the
< second transparent film >
As shown in fig. 7, the optical laminate may include a
The material, thickness, optical properties, and the like of the second transparent film disposed between the
For example, when the image display unit 1 is an organic EL unit, a λ/4 plate is used as the
In the case where the image display unit 1 is a liquid crystal unit, various optical compensations can be performed by using an optically anisotropic film as the
For example, an optical anisotropic element having refractive index anisotropy of nx > nz > ny, an optical anisotropic element having refractive index anisotropy of nx > ny ≈ nz (positive a plate), an optical anisotropic element having refractive index anisotropy of nx > ny > nz (negative B plate), an optical anisotropic element having refractive index anisotropy of nx ≈ ny > nz (negative C plate), or the like is used for optical compensation of a liquid crystal cell of the VA system. These optically anisotropic elements are arranged such that the direction of the slow phase axis is in a relationship of 0 ° or 90 ° to the direction of the absorption axis of the
In optical compensation of a TN liquid crystal cell, an optically anisotropic element in which the optical axis is obliquely oriented is preferably used. It is also preferable to use a liquid crystal alignment film in which the tilt direction of the optical axis varies along the thickness direction. The optically anisotropic element in which the optical axis is aligned obliquely exhibits a viewing angle compensation function in the on state of the TN liquid crystal.
In the optical compensation of the IPS mode liquid crystal cell, an optically anisotropic element having a relationship of nx > nz > ny is preferably used (for example, japanese patent No. 3687854 and japanese patent No. 5519423). By arranging the optically anisotropic elements having the relationship of nx > nz > ny so that the direction of the slow phase axis is in a relationship of 0 ° or 90 ° with the direction of the absorption axis of the
Two or more layers having different optical anisotropy may be stacked to form an optically anisotropic element having a relationship nx > nz > ny. As the laminated structure, there are given a combination of an optical anisotropic element (negative B plate) having a relationship of nx > ny > nz and an optical anisotropic element (positive B plate) having a relationship of nz > nx > ny (for example, Japanese patent No. 4938632 and Japanese patent No. 6159290), a combination of a negative B plate and an optical anisotropic element (positive C plate) having a relationship of nz > nx > ny (for example, Japanese patent No. 4907993), a combination of an optical anisotropic element (positive A plate) having a relationship of nx > ny ≈ nz and a positive C plate (for example, Japanese patent No. 3880996), a combination of a positive A plate and a positive B plate (for example, Japanese patent No. 0712006-964), a combination of a negative C plate and a positive B plate (for example, Japanese patent No. 4855081), a combination of a negative B plate and an optical anisotropic element (negative A plate) having a relationship of nz ≈ nx > ny (for example, Japanese patent No. 4689286), A combination of a negative C plate and a negative a plate (e.g., japanese patent No. 4253259), and the like.
< adhesive layer >
Preferably, the glass layer, the transparent film, and the polarizer are laminated between these layers with an adhesive layer (not shown) interposed therebetween. Examples of the material constituting the adhesive include thermosetting resins, active energy ray-curable resins, and the like. Specific examples of such resins include epoxy resins, silicone resins, acrylic resins, polyurethanes, polyamides, polyethers, and polyvinyl alcohols. The adhesive may contain a polymerization initiator, a crosslinking agent, an ultraviolet absorber, a silane coupling agent, and the like.
The thickness of the adhesive layer is preferably 10 μm or less, more preferably 0.05 to 8 μm, and still more preferably 0.1 to 7 μm. When the thickness of the adhesive layer for bonding the glass layer to the transparent film, the glass layer to the polarizer, or the polarizer to the transparent film is within the above range, breakage of the glass layer can be suppressed, and an optical laminate having excellent impact resistance can be obtained. The adhesive may be used for bonding the transparent films to each other.
< layer for imparting functionality >
The optical laminate may have various functionality-imparting layers other than those described above. Examples of the functionality-imparting layer include an antireflection layer, an antifouling layer, a light diffusion layer, an easy-adhesion layer, and an antistatic layer.
(anti-reflection layer)
Examples of the antireflection layer include a thin layer type in which reflection is prevented by a cancellation effect of reflected light by a multiple interference effect of light, and a type in which a surface is provided with a fine structure to reduce reflectance. By providing the antireflection layer on the second main surface of the
(antifouling layer)
An antifouling layer may be provided on each member constituting the optical laminate. In particular, since the
Both the antireflection layer and the antifouling layer may be provided on the second main surface of the
(light diffusion layer)
The light diffusion layer may be disposed on the optical laminate for the purpose of widening the viewing angle, preventing color development of condensed light, or the like. As the light diffusion layer, a layer with small back scattering is preferable. The haze of the light diffusion layer is preferably 20 to 88%, and more preferably 30 to 75%. As the light diffusion layer, for example, a diffusion adhesive layer is used. As the diffusion pressure-sensitive adhesive layer, a layer in which particles having different refractive indices are mixed in a polymer constituting a pressure-sensitive adhesive is used.
The arrangement of the light diffusion layer in the optical laminate is not particularly limited, and for example, the light diffusion layer may be provided on the viewing side surface of the
Alternatively, instead of providing a light diffusion layer, the surface of a glass layer, a transparent film, a polarizer, or the like may be subjected to an anti-glare treatment in addition to the light diffusion layer. For example, the anti-glare treatment may be a method of imparting a fine uneven structure to the surface by roughening by sandblasting, embossing, or the like, or by blending transparent fine particles.
(easy adhesion layer)
The easy-adhesion layer may be provided on the surface of the
(antistatic layer)
An antistatic layer may also be provided on the surface of the glass layer, the transparent film, the polarizer, or the like. As the antistatic layer, a layer in which an antistatic agent is added to a binder resin is preferably used. Examples of the antistatic agent include ionic surfactant systems, conductive polymers such as polyaniline, polythiophene, polypyrrole, and polyquinoxaline, and metal oxide systems such as tin oxide, antimony oxide, and indium oxide. In particular, from the viewpoint of optical characteristics, appearance, antistatic effect, and the like, a conductive polymer is preferably used. Among them, water-soluble or water-dispersible conductive polymers such as polyaniline and polythiophene are preferable.
The thickness of the antistatic layer is, for example, 0.01 to 2 μm, preferably 0.05 to 1 μm. The easy-adhesion layer having antistatic properties may be formed by including an antistatic agent in the binder resin of the easy-adhesion layer.
< method for producing optical laminate roll >
An optical laminate roll can be obtained by laminating a long glass layer, a transparent film, a polarizer, and the like in a roll-to-roll manner and winding them around an appropriate core. The roll-to-roll lamination is a method of aligning and continuously laminating long flexible films while the films are conveyed by rolls. A film such as an antireflection layer or an antifouling layer may be formed on a substrate by a sputtering method, an ion plating method, a CVD method, or the like while the substrate is conveyed by roll-to-roll.
The stacking order is not particularly limited. For example, the
The method of curing the adhesive can be appropriately selected according to the type of the adhesive. When the adhesive is a photocurable adhesive, the adhesive is cured by ultraviolet irradiation. The irradiation conditions of ultraviolet rays can be appropriately selected according to the type of adhesive, the composition of the adhesive composition, and the like. The cumulative light amount is, for example, 100 to 2000mJ/cm2. In the case where the adhesive is a thermosetting adhesive, the adhesive is cured by heating. The heating conditions may be appropriately selected depending on the type of adhesive, the composition of the adhesive composition, and the like. The heating conditions are, for example, 50 ℃ to 200 ℃ and the heating time is about 30 seconds to 30 minutes.
The
In order to obtain an optical laminate having a long size of 100m or more, it is important to prevent breakage due to bending of the glass layer. In order to prevent the glass layer from being damaged by bending, it is preferable that the end face crack is less continuous over the entire longitudinal direction, and the end face quality when the glass layer or the optical laminate is wound in a roll shape is good. The number of cracks having a length of 3 μm or more on the end face of the glass layer is preferably 5 or less, more preferably 1 or less, and further preferably 0.5 or less per 1m in the longitudinal direction. The length of the crack is the distance in the width direction from the end face of the glass layer to the tip of the crack.
Even when the number of cracks at the end in the width direction of the glass layer is small, or when the length of the crack is large, breakage due to propagation of the crack is likely to occur. Therefore, even when cracks occur at the end faces of the glass layers, it is preferable that no cracks having a length of more than 300 μm are present over 10m or more in the longitudinal direction, and no cracks having a length of more than 300 μm are present over 100m or more in the longitudinal direction. The maximum value of the crack length when the end face of the glass layer is observed over 10m in the longitudinal direction is preferably 300 μm or less, more preferably 100 μm or less, and still more preferably 50 μm or less.
In order to obtain a glass layer having few cracks and good end surface quality as described above, it is preferable to remove the crack or crack-generating portion. As a method for preventing generation of cracks or removal of cracks, polishing processing typified by laser, scribe cutting, water jet, continuous temporary cutting by cutting, and polishing can be given. Two or more types of glass and optical laminate may be appropriately selected from the above methods and combined to prevent and/or remove cracks, depending on the combination of the glass and the optical laminate.
In the optical laminate roll in which the optical laminate is wound in a roll shape, the end face of the glass layer may be positioned inside the optical laminate roll. For example, as in the laminate 141 shown in fig. 28, when the
When the surface
When the end face of the glass layer is located inside the end face of the optical laminate roll, the distance D between the end face of the roll and the end face of the glass layer may be 1mm or more, 3mm or more, 5mm or more, 7mm or more, 10mm or more, 15mm or more, or 20mm or more. The greater the distance D from the end surface of the roller to the end surface of the glass layer, the greater the breakage preventing effect of the glass layer by the buffer action tends to be. On the other hand, since the film or the adhesive provided so as to protrude from the glass layer is not included in the effective product region of the laminate, if the distance D is too large, a cost increase due to material loss may be caused. The distance D between the end face of the roller and the end face of the glass layer may be 200mm or less, 100mm or less, 70mm or less, or 50mm or less.
As described above, the width of the optical laminate is, for example, 0 to 3000mm, preferably 10 to 2000 mm. The ratio of the width of the glass layer to the width of the optical laminate roll (the width of the member having the largest width among the optical elements constituting the laminate) is, for example, 85 to 100%, preferably 90 to 99%, and more preferably 95 to 98%.
As described above, the length of the optical laminate is 100m or more, preferably 300m or more, more preferably 500m or more, and further preferably 700m or more. The longer the length of the optical laminate is, the more remarkable the breakage preventing effect of the glass layer formed so that the end face of the glass layer is positioned inside the end face of the optical laminate roll tends to be.
In order to prevent the glass layer from being damaged due to crack propagation, an anti-crack propagation strategy can also be adopted. For example, even when a long crack is present at an end of the glass layer, the crack can be prevented from damaging the glass layer by adopting an anti-crack propagation strategy. The above-described crack generation and/or removal prevention and crack propagation prevention may be used together.
In order to prevent the propagation of cracks generated at the end surfaces of the glass layer, the crack propagation prevention means is preferably provided on the surface of the glass layer. For example, by bonding a resin film to the surface of the glass layer with an adhesive, the propagation of a crack in the width direction due to bending can be suppressed. Even when a crack propagates in the width direction from the end of the glass layer, the resin film is bonded to the crack propagation tip through the adhesive, and the adhesive elastically deforms, so that the crack propagation can be prevented by the adhesive.
Preferably, the crack propagation prevention means is provided at least at or near both ends in the width direction of the glass layer. The entire glass layer in the width direction may be provided with a crack propagation preventing means. For example, as shown in fig. 2, the surface
When the crack propagation prevention means is provided at the end portions in the width direction of the glass layer, the band-shaped crack propagation prevention means 50 in which the
At least two
The
The Young's modulus of the
Examples of the material for the
The creep amount of the
Slip constant S of
The slip constant S is inversely proportional to the radius of curvature R of the
In the production of the optical laminate roll, the timing of providing the crack-preventing means such as the
When a transparent film or a polarizing plate is laminated on the first main surface of the
The crack-preventing expansion unit may be disposed on both sides of the
< characteristics of optical layered body >
The optical laminate of the first embodiment has high hardness because it includes the
Further, since the glass material has high moisture and gas-shielding properties, high durability against organic solvents, acids, alkalis, and the like, and excellent heat resistance, by disposing the
Since the glass material has a glossy surface, a beautiful glare feeling can be obtained by disposing the
The
[ second embodiment ]
In the first embodiment, the polarizer and the adhesive layer are arranged in this order on the first main surface of the flexible glass layer, but the optical laminate of the optical laminate roll of the present invention is not particularly limited as long as it has a glass layer, a polarizer, and an adhesive layer. For example, in the optical laminate roll according to the second embodiment of the present invention, the adhesive layer is disposed on the first main surface of the glass layer, and the polarizer is disposed on the second main surface of the glass layer.
Fig. 12 is a cross-sectional view showing an example of the laminated structure of the optical laminate according to the second embodiment. The
In the second embodiment, the constituent materials, thicknesses, and the like of the glass layer, the transparent film, the polarizer, and the like are the same as those of the first embodiment. Preferably, the layers are attached by a suitable adhesive. Similarly to the first embodiment, a functional layer such as an antireflection layer, an antifouling layer, a light diffusion layer, an easy adhesion layer, and an antistatic layer may be provided on the surface of each layer.
The
As shown in fig. 14, a second
The second transparent film disposed between the
In the
The second
[ third embodiment ]
In the optical laminate roll according to the third embodiment of the present invention, the optical laminate includes the polarizer and the adhesive layer on the first main surface of the glass layer, and includes the transparent film on the second main surface of the glass layer.
Fig. 20 is a cross-sectional view showing an example of the laminated structure of the optical laminate according to the third embodiment. The optical laminate 131 shown in fig. 20 includes the
In the third embodiment, the constituent materials, thicknesses, and the like of the glass layer, the transparent film, the polarizer, and the like are the same as those of the first embodiment. Preferably, the layers are attached by a suitable adhesive. Similarly to the first embodiment, a functional layer such as an antireflection layer, an antifouling layer, a light diffusion layer, an easy adhesion layer, and an antistatic layer may be provided on the surface of each layer.
The
A second
In the case where the second
[ formation of image display device ]
The optical laminate is used to form an image display device. In forming the image display device, the
In the formation of the image display device, a single-layer optical laminate matching the size of the image display device is cut out from an optical laminate roll. The cutting to the monolayer may be performed in advance. The long optical layered body may be wound from a roll, cut into a single layer, and bonded to the image display unit.
After the image display unit and the optical laminate are bonded, a transparent member such as a front window may be provided on the optical laminate as necessary. In the optical laminate of the first embodiment, the
Description of the reference numerals
10 layers of glass
30 polarizer
20. 21, 22 transparent film (first transparent film)
40. 41, 42 transparent film (second transparent film)
80 adhesive layer
91 diaphragm
92 surface protective film
111. 112, 114 to 118 optical laminate
121-128 optical laminate
131 to 138 optical laminate
1 image display unit
501 image display device
50 belt (crack expansion unit)
58 adhesive layer
59 resin film
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