TWI805737B - Optical layered body, optical layered body with cover glass and manufacturing method thereof, and image display device with cover glass - Google Patents

Abstract

The present invention provides an optical layered body in which cracks are suppressed despite being machined, an optical layered body with a cover glass including the optical layered body, and a method for producing the same, and the optical layered body or cover glass including the optical layered body An image display device with a cover glass of an optical laminated body of glass. The optical laminate of the present invention has a cut optical film and an adhesive layer, and the ratio RR/DR of the normal reflectance RR to the diffuse reflectance DR of the cut end face is 0.15 or more. The optical laminate with a cover glass of the present invention has the optical laminate and a cover glass, and the cover glass is laminated through another adhesive layer disposed on the side opposite to the adhesive layer of the optical laminate.

Description

Optical layered body, optical layered body with cover glass and manufacturing method thereof, and image display device with cover glass

The present invention relates to an optical layered body, an optical layered body with a cover glass and a method for producing the same, and an image display device with a cover glass including the optical layered body or the optical layered body with a cover glass.

Background of the invention Image display devices such as mobile phones and notebook personal computers use various optical laminates (for example, polarizing plates) in order to realize image display and/or improve the image display performance. After the optical layered body is cut into a predetermined shape, it may be used for finishing by cutting the cut surface. In addition, in recent years, it may be desired to process the optical layered body into a shape other than rectangular (special-shaped processing). In the above-mentioned cutting process, cutting may be performed with an end mill. However, cracks may occur in optical laminates after cutting with an end mill.

Prior art literature patent documents Patent Document 1: Japanese Patent Laid-Open No. 2007-187781 Patent Document 2: Japanese Patent Laid-Open No. 2018-022140

Summary of the invention The problem to be solved by the invention The present invention is made to solve the above-mentioned conventional problems, and its main object is to provide an optical layered body in which cracks are suppressed even though it has been cut, an optical layered body with a cover glass including the optical layered body, and the like A manufacturing method, and an image display device with a cover glass comprising the optical laminate or the optical laminate with a cover glass.

method to solve the problem The optical laminate of the present invention has a cut optical film and an adhesive layer, and the ratio RR/DR of the normal reflectance RR to the diffuse reflectance DR of the cut end face is 0.15 or more. In one embodiment, the optical film includes a polarizer. In one embodiment, the optical film further has a protective film on the opposite side of the polarizer to the adhesive layer. In one embodiment, the optical film further has another protective film between the polarizer and the adhesive layer. In one embodiment, the above-mentioned another protective film also serves as a retardation layer. Another aspect of the present invention is to provide an optical laminate with a cover glass. The optical laminate with a cover glass has the above-mentioned optical laminate and a cover glass, and the cover glass is laminated through another adhesive layer disposed on the opposite side of the optical laminate from the adhesive layer. According to yet another aspect of the present invention, an image display device with a cover glass can be provided. The image display device with a cover glass includes: a display unit, the above-mentioned optical laminate and a cover glass, the optical laminate is arranged on the viewing side of the display unit, and the cover glass is arranged on the viewing side of the optical laminate. Another image display device with a cover glass of the present invention has a display unit and the above-mentioned optical laminate with a cover glass, and the optical laminate with a cover glass is disposed on the viewing side of the display unit.

Invention effect According to the present invention, by setting the ratio RR/DR of the normal reflectance RR to the diffuse reflectance DR of the cut end face of the machined optical laminate to be 0.15 or more, cracks (especially cracks after a thermal cycle test) can be suppressed. The optical laminate can be suitably laminated with a cover glass, and can be suitably used for an image display device with a cover glass.

form for carrying out the invention The specific embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited by these embodiments. In addition, the drawings are schematically displayed for easy viewing, and ratios of length, width, thickness, etc., angles, etc. in the drawings are different from actual ones.

A. Optical laminate The optical laminate of the present invention has a cut optical film and an adhesive layer. Fig. 1 is a schematic cross-sectional view illustrating an optical laminate according to an embodiment of the present invention. The optical laminated body 100 of the illustrated example has an optical film 110 and an adhesive layer 120 . In practical application, the separating part 130 is temporarily adhered on the surface of the adhesive layer 120 in a peelable manner. The optical laminate of the present invention can be suitably laminated with a cover glass, and can be suitably applied to an image display device with a cover glass.

As the optical film, any appropriate optical film that can be used for applications requiring cutting can be mentioned. The optical film may be a single-layer film or a laminate. Specific examples of optical films include polarizers, retardation films, polarizers (represented as laminates of polarizers and protective films), conductive films for touch panels, surface treatment films, and proper lamination of these according to the purpose. The resulting laminate (such as a circular polarizing plate for anti-reflection, a polarizing plate with a conductive layer for a touch panel). According to the embodiment of the present invention, cracks can be remarkably suppressed especially in an optical layered body including an optical film that is easily shrunk like a polarizer.

For example, when the optical film 110 is a polarizer, the polarizer may only have a protective film on the opposite side of the polarizer to the adhesive layer 120, or may only have a protective film between the polarizer and the adhesive layer 120, Alternatively, protective films may be provided on both of them. The protective film provided on the side opposite to the adhesive layer may also be subjected to surface treatments such as hard coating treatment, anti-reflection treatment, anti-adhesion treatment, and anti-glare treatment as required. In one embodiment, the protective film disposed between the polarizer and the adhesive layer is preferably isotropic optically. "Optically isotropic" in this specification means that the retardation Re(550) in the plane is 0nm~10nm, and the retardation Rth(550) in the thickness direction is -10nm~+10nm. In another embodiment, this protective film may also serve as a retardation layer. The structure of the protective film as a phase difference layer can employ|adopt arbitrary appropriate structure according to the purpose. For example, the protective film may be a λ/2 plate, a λ/4 plate, or a laminate of these. The λ/2 plate and λ/4 plate represent the refractive index characteristics of nx>ny≧nz. The in-plane retardation Re(550) of the λ/2 plate is preferably 180nm~320nm, and the in-plane retardation Re(550) of the λ/4 plate is preferably 100nm~200nm. For another example, the protective film can also be a laminate of negative B plate (nx>ny>nz) and positive C plate (nz>nx=ny). In addition, "Re(λ)" in this specification is the in-plane retardation measured with the light of wavelength λnm at 23 degreeC. For example, "Re(550)" is the in-plane retardation measured at 23°C with light with a wavelength of 550nm. Re(λ) can be calculated by the formula: Re(λ)=(nx-ny)×d when the thickness of the layer (thin film) is d(nm). "Rth(λ)" is the retardation in the thickness direction measured with light of wavelength λnm at 23°C. For example, "Rth(550)" is the retardation in the thickness direction measured at 23°C with light of wavelength 550nm. Rth(λ) can be obtained by the formula: Rth(λ)=(nx-nz)×d when the thickness of the layer (film) is d(nm). "nx" is the refractive index in the direction where the in-plane refractive index becomes the largest (that is, the direction of the slow axis), "ny" is the refractive index in the direction that is perpendicular to the slow axis in the plane (that is, the direction of the fast axis), and " nz" is the refractive index in the thickness direction.

The adhesive layer 120 is mainly used for attaching the final optical laminate to the display unit. According to the embodiment of the present invention, cracks (especially cracks after a thermal cycle test) can be suppressed even after the optical laminate including the adhesive layer is cut. Typically, the adhesive layer 120 may be composed of an acrylic adhesive (acrylic adhesive composition). The acrylic adhesive composition typically contains a (meth)acrylic polymer as a main component. The (meth)acrylic polymer can be contained in the adhesive composition at a ratio of, for example, 50% by weight or more, preferably 70% by weight or more, more preferably 90% by weight or more in the solid content of the adhesive composition. The (meth)acrylic polymer contains an alkyl (meth)acrylate as a main component as a monomer unit. In addition, (meth)acrylate means acrylate and/or methacrylate. The alkyl group of the alkyl (meth)acrylate includes, for example, a linear or branched alkyl group having 1 to 18 carbon atoms. The average carbon number of the alkyl group is preferably 3-9. In addition to (meth)acrylic acid alkyl esters, monomers constituting (meth)acrylic polymers can also include carboxyl-containing monomers, hydroxyl-containing monomers, amide-containing monomers, aromatic ring-containing ( Meth)acrylate, etc. The acrylic adhesive composition preferably contains a silane coupling agent and/or a crosslinking agent. The silane coupling agent may, for example, be an epoxy group-containing silane coupling agent. As a crosslinking agent, an isocyanate type crosslinking agent and a peroxide type crosslinking agent are mentioned, for example. The thickness of the adhesive layer may be, for example, 10 μm˜50 μm. Details of the adhesive layer or the acrylic adhesive composition have been described in, for example, Japanese Patent Laid-Open No. 2016-190996, and this specification uses the description of the publication as a reference.

In the embodiment of the present invention, the ratio RR/DR of the normal reflectance RR to the diffuse reflectance DR of the cut end face of the optical laminate is 0.15 or more, preferably 0.16 or more, preferably 0.22 or more, more preferably 0.24 or more. The upper limit of the ratio RR/DR is, for example, 0.37, preferably 0.30. As long as the ratio RR/DR is within the above range, cracks (especially cracks after a heat cycle test) on the optical layered body after cutting (for example, end milling) can be suppressed. In particular, cracks can be suppressed when a machined optical laminate is laminated to a cover glass.

The normal reflectance RR of the cut end face of the optical laminate is preferably 0.30% or more, preferably 0.40% or more, more preferably 0.50% or more. The upper limit of the normal reflectance RR is, for example, 0.75%, preferably 0.65%. The diffuse reflectance DR of the cut end face of the optical laminate is preferably 2.40% to 5.00%, and more preferably 2.50% to 3.50%.

The normal reflectance RR and the diffuse reflectance DR are obtained, for example, as follows, and the ratio RR/DR is calculated from the obtained RR and DR. Randomly select the optical laminates that have been cut and processed, and then layer the selected optical laminate volumes to make a laminate with a thickness of about 15mm. More specifically, the optical layering system is randomly selected from a plurality of different workpieces (related workpieces will be described later). With the measurement surface of the produced laminate flat, rubber bands were wound around positions (two locations) at predetermined distances from both ends of the laminate in the direction of the measurement surface to bind the laminate. For the measurement surface of the bundled laminate, use a spectrophotometer (such as "CM-2600d" manufactured by Konica Minolta Co., Ltd.) to measure SCI (Specular Component Include, including specular regular reflection light) and SCE (Specular Component Exclude, excluding specular positive reflection light). Reflected light), and the normal reflectance RR and diffuse reflectance DR are obtained from the following formula. Normal reflectivity RR=SCI-SCE Diffuse reflectance DR = SCE

The following is more detailed for RR/DR. Fig. 2 is a photo obtained by observing the state of transmitted light on the cutting end face when the optical laminated volume with RR/DR satisfying the above-mentioned range is laminated to a predetermined thickness, and Fig. 3 is when RR/DR is separated from the above-mentioned range. The photo obtained by observing the state of the transmitted light on the cutting end face in the state where the volume of the optical laminate in the range is layered to a predetermined thickness. Comparing Fig. 2 and Fig. 3, it can be seen that the optical layered body whose RR/DR satisfies the above-mentioned range has a clear outline of light (that is, glossy), and on the other hand, the optical layered body whose RR/DR deviates from the above-mentioned range Its light profile is unclear (matte). The inventors of the present invention conducted trial and error on the problem of cracks in optical laminates processed by cutting (representatively, end mill processing), and found that cracks in optical laminates with a glossy cut end surface are suppressed. In particular, it was found that the cracks of the laminated body during lamination with the cover glass are suppressed. As mentioned above, the present invention solves the new problems arising in the cutting process of optical laminates (representatively, end mill processing) by optimizing the gloss (or RR/DR) of the cutting end surface. The effect is actually an unexpected excellent effect. In addition, in Fig. 2 and Fig. 3, the state of transmitted light is shown to clarify the difference, but the gloss of reflected light also corresponds to this.

The steps in the method of manufacturing the optical layered body with the planar shape as shown in FIG. 4 will be described below with an example.

B. Form the workpiece FIG. 4 is a schematic perspective view for explaining the cutting process, and the workpiece 1 is shown in this figure. As shown in FIG. 4, a workpiece 1 is formed by laminating a plurality of optical laminates. When the optical laminate is formed into a workpiece, it is usually cut into any appropriate shape. Specifically, the optical layered body may be cut into a rectangular shape, may be cut into a shape similar to a rectangular shape, or may be cut into an appropriate shape (such as a circle) according to the purpose. In the illustrated example, the optical layered system is cut into a rectangular shape, and the workpiece 1 has outer peripheral surfaces (cut surfaces) 1a, 1b facing each other and outer peripheral surfaces (cut surfaces) 1c, 1d orthogonal thereto. The workpiece 1 should be clamped from top to bottom by a clamp mechanism (not shown). The total thickness of the workpiece is preferably 8 mm to 20 mm, preferably 9 mm to 15 mm, more preferably about 10 mm. As long as it is the above-mentioned thickness, it is possible to prevent damage caused by extrusion of the clamping mechanism or impact during cutting. The optical lamination system laminates the workpiece to the stated total thickness. The number of optical laminates constituting the workpiece may be, for example, 10 to 50 sheets. The clamping mechanism (such as a clamp) can be made of soft material or hard material. When made of soft materials, the hardness (JIS A) should be 60°~80°. If the hardness is too high, the indentation caused by the clamping mechanism may remain. If the hardness is too low, the position will be shifted due to the deformation of the fixture, resulting in insufficient cutting accuracy.

C. Machining Next, the outer peripheral surface of the workpiece 1 is cut by the cutting mechanism 20 . Cutting is performed by bringing the cutting edge of the cutting mechanism into contact with the outer peripheral surface of the workpiece 1 . Cutting can be carried out covering the entire circumference of the outer peripheral surface of the workpiece, and can also be carried out only at predetermined positions. When producing an optical layered body having a planar shape as shown in FIG. 4, cutting typically covers the entire circumference of the outer peripheral surface of the workpiece. The cutting process is represented in Figure 5 to Figure 7, which is the so-called end mill processing. That is, the outer peripheral surface of the workpiece 1 is cut using the side surface of the cutting mechanism (end mill) 20 . The cutting mechanism (end mill) 20 represents that a straight edge end mill can be used.

As shown in FIGS. 6 and 7 , the end mill 20 has: a rotating shaft 21 extending along the stacking direction (vertical direction) of the workpiece 1; outermost diameter. The cutting edge 22 can be configured as shown in FIG. 6 to be twisted along the outermost diameter of the rotating shaft 21 (may have a predetermined twist angle), or as shown in FIG. 7 to be configured to extend in a direction substantially parallel to the rotating shaft 21 ( The twist angle can be 0°). In addition, "0°" means that it is substantially 0°, and it also includes cases where there is a slight angle twist due to processing errors and the like. When the cutting edge has a predetermined twist angle, the twist angle is preferably not more than 70°, preferably not more than 65°, more preferably not more than 45°. The cutting edge 22 includes a blade edge 22a, a rake face 22b and a flank face 22c. The number of cutting edges 22 can be appropriately set as long as a desired number of contact times described later can be obtained. The number of blades in Fig. 6 is 3 and the number of blades in Fig. 7 is 2, but the number of blades can be 1, 4, or more than 5. The number of blades should be 2 pieces. As long as it is constituted as described above, the rigidity of the blade can be ensured, and chip pockets can be secured to discharge chips well.

In one embodiment, the HV hardness of the cutting edge 22 is generally above 1500, preferably above 1700, more preferably above 2000. The upper limit of the HV hardness may be 2350, for example. At this time, the cutting edge is made of cemented carbide. Cemented carbide represents the powder obtained by sintering metal carbides. Specific examples of superhard alloys include WC-Co alloys, WC-TiC-Co alloys, WC-TaC-Co alloys, and WC-TiC-TaC-Co alloys. In addition, HV hardness is also called Vickers hardness, which can be measured in accordance with JIS Z 2244.

In another embodiment, the HV hardness of the cutting edge 22 is generally above 7000, preferably above 8000, preferably above 9000, more preferably above 10000. The upper limit of the HV hardness may be 15,000, for example. At this point, the cutting edge is represented by sintered diamonds. More specifically, the cutting edge is formed with a sintered diamond layer on a base made of superhard alloy. Sintered diamond (PCD: Polycrystalline diamond) refers to a polycrystalline diamond obtained by sintering small diamond particles with metal and/or ceramic powder under high temperature and high pressure.

The conditions of the cutting process can be appropriately set according to the purpose. For example, a cut optical layered body having a predetermined RR/DR can be obtained by appropriately adjusting the feed rate, the number of revolutions, the number of blades, etc. of the end mill. In this manual, "feed speed" refers to the relative speed between the cutting mechanism (end mill) and the workpiece. Therefore, during cutting, only the end mill may be moved, only the workpiece may be moved, or both the end mill and the workpiece may be moved. The number of cutting can be 1 time, 2 times, 3 times or more. In one embodiment, the diameter of the end mill 20 is preferably 3 mm to 20 mm.

In the above manner, a machined optical laminate having a predetermined RR/DR can be produced. In addition, the cut optical laminate (essentially the optical film and the adhesive layer) may have cutting marks on the representative surface.

D. Optical laminate with cover glass The optical layered body according to the embodiment of the present invention (for example, the optical layered body described in the above items A to C) can be suitably laminated with a cover glass as described above. Therefore, the optical layered body with a cover glass is also contained in embodiment of this invention. Fig. 8 is a schematic cross-sectional view illustrating an optical laminate with a cover glass according to an embodiment of the present invention. The optical laminated body 101 with a cover glass of the illustrated example has a polarizer 110, an adhesive layer 120, and a cover glass 150, and the cover glass 150 passes through another layer disposed on the opposite side of the polarizer 110 from the adhesive layer 120. The adhesive layer 140 is laminated. A separator 130 is temporarily attached to the surface of the adhesive layer 120 in a peelable manner. That is, the optical laminate 101 with a cover glass has the optical laminate and the cover glass 150 shown in FIG. 140 and stacked.

The storage elastic modulus of the adhesive (adhesive composition) constituting the other adhesive layer 140 at -40°C is preferably 1.0×10 ⁸ (Pa) or higher. As long as the above-mentioned adhesive layer is used, the synergistic effect obtained by optimizing the RR/DR of the cut end face of the optical layered body can be achieved even when the cover glass is bonded to the cut optical layered body. Cracks (especially cracks after thermal cycle test) can still be suppressed. The adhesive (adhesive composition) may, for example, be a rubber-based adhesive. Typically, the rubber-based adhesive may contain a butadiene polymer and/or a polyisoprene polymer (or a modified product thereof) and a photopolymerization initiator. The rubber-based adhesive may further contain polyurethane acrylate, polyisoprene-based acrylate or its esterified product, terpene-based hydrogenated resin, dicyclopentenyloxyethyl methacrylate, methacrylic acid 2-hydroxybutyl ester, etc.

The cover glass 150 can adopt a well-known structure in the industry, so detailed description is omitted.

The optical laminate with a cover glass can be produced by bonding the cover glass to a cut optical laminate (such as the optical laminate described in items A to C above) through the above-mentioned another adhesive layer 140 .

E. Image display device with cover glass The optical layered body according to the embodiment of the present invention (for example, the optical layered body described in the above items A to C) can be applied to an image display device with a cover glass as described above. Therefore, an image display device with a cover glass is also included in the embodiments of the present invention. An image display device with a cover glass includes a display unit, an optical layered body according to an embodiment of the present invention, and a cover glass, the optical layered body is arranged on the viewing side of the display unit, and the cover glass is arranged on the viewing side of the optical layered body .

The optical laminate with a cover glass according to the embodiment of the present invention (for example, the optical laminate with a cover glass described in item D above) can also be applied to an image display device to form an image display device with a cover glass. In this case, the image display device with a cover glass has a display unit and the optical laminate with a cover glass according to the embodiment of the present invention, and the optical laminate with a cover glass is arranged on the viewing side of the display unit.

The image display device may be, for example, a liquid crystal display device, an organic electroluminescence (EL) display device, or a quantum dot display device. Example

Hereinafter, the present invention will be specifically described with examples, but the present invention is not limited by these examples. The evaluation items of the embodiment are as follows.

(1) RR/DR Polarizing plates were randomly selected from a plurality of different workpieces prepared in Examples and Comparative Examples, and then the selected polarizing plates were laminated to produce a laminate with a thickness of about 15 mm. In the state where the measurement surface of the produced laminate was made flat, a rubber band (manufactured by IGO Co., Ltd., #7) was wound around a position (2 places) at a distance of 10 mm from both ends of the laminate in the direction of the measurement surface. stack bundle. For the measurement surface of the bundled laminate, SCI and SCE were measured using a spectrophotometer ("CM-2600d" manufactured by Konica Minolta Co., Ltd.), and normal reflectance RR and diffuse reflectance DR were obtained from the following formulas. Normal reflectivity RR=SCI-SCE Diffuse reflectance DR = SCE (2) Cracks Glass plates were attached to both sides of the polarizing plates produced in Examples and Comparative Examples, and a 200-cycle thermal cycle (thermal shock) test was performed at -40°C to 85°C. For the occurrence of cracks after the test, the polarizing filter (Polarizing Filter) is configured to be in a state of orthogonal polarization with the absorption axis of the polarizer of the above-mentioned polarizer, and the transmitted light inspection is carried out in this state, and the following criteria are followed Evaluate. Yes: Light leakage can be confirmed None: No light leakage was confirmed

>Example 1> According to the conventional method, a surface protection film (48 μm)/hard coat layer (5 μm)/cycloolefin-based protective film (47 μm)/polarizer (5 μm)/cycloolefin-based protective film (24 μm) is prepared in order from the viewing side. )/Adhesive layer (20μm)/Polarizing plate with an adhesive layer composed of separators. The adhesive layer is made according to [0121] and [0124] of JP-A-2016-190996. Punch out the obtained polarizing plate with the adhesive layer into a shape similar to that shown in Figure 4 (approximate size is 142.0mm×66.8mm and the R of the four corners is 6.25mm), and stack multiple pieces of the punched adhesive Layered polarizers are used to make workpieces (total thickness about 10mm). The obtained workpiece is clamped with a clamp (fixture), and the peripheral part is cut by end milling in this state, and the polarized light with the cut adhesive layer as shown in Fig. 4 is obtained. plate. The cutting edge of the end mill is made of sintered diamond with a HV hardness of 10,000. In addition, the number of blades of the end mill is two, and the twist angle is 0°. In addition, the feed rate of the end mill (the feed rate when cutting the straight line) is 1000mm/min, the number of revolutions is 25000rpm, and the number of cuts is 2 times (0.1mm for the first time, 0.2mm for the second time, and 0.2mm for the second time, and amount 0.3mm). The RR/DR of the obtained polarizing plate with the adhesive layer after cutting was 0.17.

Peel off the surface protection film of the above-mentioned polarizing plate attached with the adhesive layer, and form another adhesive layer on the peeled surface. Another adhesive layer is made according to [0053] of Japanese Patent Application Laid-Open No. 2016-103030. After peeling off the separator temporarily attached to the adhesive layer on the side of the cycloolefin-based protective film, and then attaching glass plates to both sides of the polarizing plate with adhesive layers on both sides prepared in the above manner, For the crack assessment above. List the results in Table 1.

>Example 2 and Comparative Examples 1~2> Except changing the cutting conditions to those shown in Table 1, a polarizing plate with a cut adhesive layer as shown in FIG. 4 was produced in the same manner as in Example 1. Table 1 shows the RR/DR of the obtained polarizing plate with the adhesive layer after cutting. And the evaluation of cracks was carried out in the same manner as in Example 1. List the results in Table 1.

[Table 1]

Industrial availability The cut optical layered body of the present invention is suitable for use when a cover glass is to be laminated on an image display portion, and is particularly suitable for use in a rectangular image display portion typified by a personal computer (PC) and a tablet terminal, and/or Special-shaped image display units represented by instrument panels of automobiles and smart watches.

1‧‧‧Workpiece 1a, 1b, 1c, 1d‧‧‧outer peripheral surface (cutting surface) 20‧‧‧Cutting mechanism 21‧‧‧rotation axis 22‧‧‧rotation axis 22a‧‧‧Blade 22b‧‧‧rake face 22c‧‧‧flank 100‧‧‧optical laminates 101‧‧‧Optical laminate with cover glass 110‧‧‧Optical film, polarizer (Figure 8) 120‧‧‧adhesive layer 130‧‧‧Separate parts 140‧‧‧another adhesive layer 150‧‧‧cover glass

Fig. 1 is a schematic cross-sectional view illustrating an optical laminate according to an embodiment of the present invention. Fig. 2 is a photograph obtained by observing the state of transmitted light on the cut end face in a state where an optical laminate volume according to an embodiment of the present invention is laminated to a predetermined thickness. Fig. 3 is a photograph obtained by observing the state of transmitted light on the cut end face in a state where an optical laminate volume outside the scope of the embodiment of the present invention is laminated to a predetermined thickness. Fig. 4 is a schematic plan view showing an example of the shape of the cut optical layered body of the present invention. Fig. 5 is a schematic perspective view illustrating an example of cutting processing of the optical layered body of the present invention. Fig. 6 is a schematic perspective view illustrating an example of a cutting mechanism used for cutting in the method for producing an optical layered body of the present invention. Among Fig. 7, Fig. 7 (a) is used to explain another example of the cutting mechanism used in the cutting process in the manufacturing method of the optical laminate of the present invention, which is a schematic cross-sectional view viewed from the axial direction; Fig. 7 (b) is Fig. 7 (a) A schematic perspective view of the cutting mechanism. Fig. 8 is a schematic cross-sectional view illustrating an optical laminate with a cover glass according to an embodiment of the present invention.

1‧‧‧Workpiece

1a, 1b, 1c, 1d‧‧‧outer peripheral surface (cutting surface)

20‧‧‧Cutting mechanism

Claims (6)

An optical laminate with a cover glass, which has an optical laminate and a cover glass, the optical laminate has a cut optical film and an adhesive layer, and the ratio of the normal reflectance RR to the diffuse reflectance DR of the cut end surface RR/ DR is 0.15 or more; the cover glass is laminated through another adhesive layer arranged on the side opposite to the aforementioned adhesive layer of the optical laminate. The optical laminate with cover glass according to claim 1, wherein the optical film includes a polarizer. The optical laminate with cover glass according to claim 2, wherein the optical film further has a protective film on the opposite side of the polarizer to the adhesive layer. The optical laminate with cover glass according to claim 2 or 3, wherein the optical film further has another protective film between the polarizer and the adhesive layer. The optical laminate with cover glass according to claim 4, wherein the aforementioned another protective film doubles as a retardation layer. An image display device with a cover glass, comprising: a display unit, and an optical laminate with a cover glass according to any one of Claims 1 to 5 arranged on the viewing side of the display unit.

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