JP3875331B2 - Optical member - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical member that hardly adheres to a smooth surface and is excellent in the ability to replace an in-frame mounting body, line transportability, and the like.
[0002]
[Prior art]
Conventionally, after cutting a laminated raw material provided with a pressure-sensitive adhesive layer on a long optical film to a predetermined size, after cutting, in order to prevent fine cracks or pressure-sensitive adhesive layer from protruding, etc. An optical member in which the cut surface of the laminate is smoothed by cutting or the like has been known (Japanese Patent Laid-Open No. 61-136746).
[0003]
However, when replacing the optical member mounted in a frame such as a frame of a display device, the end surface of the optical member is adhered to the inner wall of the frame, and it is difficult to remove it. However, the end face of the optical member adheres to the guide surface of the line and disturbs the running, and the normal carrying state is harmed and the efficiency of manufacturing, processing, etc. is greatly reduced.
[0004]
[Technical Problem of the Invention]
The present invention is excellent in detachability at the time of replacement of the attachment in the frame, is less likely to cause adhesion to the guide surface that disturbs normal travel during line conveyance such as manufacturing and processing, and maintains normal conveyance state, As a result, it is an object to develop an optical member that is excellent in manufacturing and processing efficiency.
[0005]
[Means for solving problems]
The present invention is composed of a laminate having at least an optical film layer and a pressure-sensitive adhesive layer, the edge of the laminate is formed on a rough surface with fine irregularities , and the laminate is a rectangular body, and An object of the present invention is to provide an optical member characterized in that the corner of the rectangular body has at least one side formed wider than the center of the side .
[0006]
【The invention's effect】
According to the present invention, the edge formed on the rough surface of the fine unevenness reduces the contact area to the inner wall of the frame such as the frame in the display device and the guide surface such as the manufacturing / processing line, and has poor adhesion, and the frame interior Excellent detachability when changing kimonos , and less likely to adhere to the guide surface that disturbs normal travel during line transportation during manufacturing and processing , and in that case, the corners have priority over the side center. The contact with the inner wall of the frame and the guide of the line is prevented and contact at the center of the side is prevented, so that the adhesive force due to the contact can be further reduced , and maintenance of normal conveyance state, as well as manufacturing and processing etc. excellent efficiency large area body can be obtained advantageously that can be applied to an optical member.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The optical member of the present invention, at least a multilayer body having an optical film layer and a pressure-sensitive adhesive layer, the edge of the laminate is formed on the rough surface of fine irregularities Rutotomoni, the laminate consists of a rectangular body And the corner | angular part of the rectangular body has at least one side formed wider than the center part of the side . Examples thereof are shown in FIGS. 1, 2 , and 3 . 1 and 4 are optical film layers, 2 is a pressure-sensitive adhesive layer, and 3 is a separator.
[0008]
The optical film forming the laminate may be made of an appropriate film exhibiting arbitrary optical characteristics such as polarization, retardation, reflection and diffusion, antireflection, interference, and diffraction. The laminate is laminated in a state including two or more appropriate optical films, such as a polarizing plate, a retardation plate, a reflecting plate, a diffusing plate, an antireflection plate, an interference plate, and a diffractive plate, with a pressure-sensitive adhesive layer interposed therebetween. It may be.
[0009]
Examples of the polymer forming the optical film include polyesters, celluloses, polyether sulfones, polycarbonates, polyamides, polyimides, polyolefins, acrylics, plastics, acrylics, urethanes, and acrylic urethanes. And thermosetting type such as epoxy type and silicone type, or ultraviolet curable type resin, various liquid crystal polymers, etc., but are not limited thereto, and the polymer is arbitrary.
[0010]
By the way, the polarizing plate adsorbs iodine and / or dichroic dye to hydrophilic polymer films such as polyvinyl alcohol film, partially formalized polyvinyl alcohol film, and ethylene / vinyl acetate copolymer partially saponified film. It is generally composed of a polyene oriented film such as a polyvinyl alcohol-based dehydrated product or polyvinyl chloride dehydrochlorinated product, or a polarizing film provided with a transparent protective film on one or both sides. It is.
[0011]
In addition, the transparent protective film layer provided for the purpose of preventing the surface damage of the polarizing plate described above is usually formed of an isotropic transparent film. Further, the retardation plate is formed of a stretched film, a liquid crystal polymer film, etc., and the reflector is, for example, a film or a film made of a reflective metal such as aluminum attached to one side of a mat-treated film if necessary, The film is formed as a film having a fine concavo-convex structure formed by adding fine particles, and a metal reflective layer attached thereto by an appropriate method such as a vapor deposition method or a plating method.
[0012]
On the other hand, the diffusion plate and the antireflection plate are formed as, for example, a mat-processed film or a film having a surface fine concavo-convex structure by adding fine particles, and the interference plate is formed as a film provided with an interference thin film. The The diffraction plate is formed as a film provided with fine irregularities and groove lines. Therefore, as described above, the optical film may be made of a film provided with appropriate characteristics such as isotropic property and anisotropy.
[0013]
The type of pressure-sensitive adhesive layer attached to the optical film is not particularly limited. For example, an appropriate transparent pressure-sensitive adhesive made of acrylic, silicone, polyester, polyurethane, polyether or rubber is used. May be formed. The thickness of the pressure-sensitive adhesive layer is generally 500 μm or less, especially 1 to 300 μm, particularly 5 to 100 μm, but is not limited thereto.
[0014]
The pressure-sensitive adhesive layer may be, for example, a natural or synthetic resin, a glass fiber or glass bead, a filler or pigment made of metal powder or other inorganic powder, a colorant, an antioxidant, or the like. The appropriate additive may be contained. Further, it may exhibit light diffusibility by containing fine particles.
[0015]
The optical film and pressure-sensitive adhesive layer described above absorb ultraviolet rays by a method of treating with an ultraviolet absorbent such as a salicylic acid ester compound, a benzophenol compound, a benzotriazole compound, a cyanoacrylate compound, or a nickel complex compound. It may have a function.
[0016]
When the pressure-sensitive adhesive layer is exposed in the laminate, it is preferable to temporarily protect the separator 3 as shown in the figure. The separator can be obtained, for example, as a film coated with an appropriate release agent such as silicone-based, long-chain alkyl-based, or fluorine-based, or a laminate thereof.
[0017]
The optical member can be obtained, for example, by stacking raw materials in a predetermined laminated state as necessary and cutting them into a predetermined rectangular size. The laminated body according to the present invention has an edge formed on a rough surface with fine irregularities, and the rough surface is laminated by cutting the raw material or the laminated body after cutting into a predetermined size as necessary. The required surface can be formed by an appropriate method such as a method of spraying sandblast of 1 mm or less or a method of polishing with sandpaper of 40 or less.
[0018]
In the above, the end surface formed on the rough surface is preferably around the optical member in the case of wearing the frame interior, and on the opposite side that may come into contact with the guide of the line when transported by a line such as manufacturing or processing A side is preferred. In the above roughening treatment, a smoothing treatment by cutting or the like for the purpose of preventing the occurrence of fine cracks or the pressure-sensitive adhesive layer from protruding as in the prior art may be used in combination.
[0019]
As for the state of fine irregularities on the rough surface formed on the edge, the protrusion width of the convex portion is preferably 1 μm or more from the viewpoint of low adhesive force generated by contact with the smooth surface, and the appearance The thickness is preferably 100 μm or less from the viewpoint of preventing the handling of defective products due to the decrease. A more preferable protrusion width of the protrusion is 2 to 50 μm.
[0020]
Further, the rectangular body forming the laminated body as the optical member has at least one side in which the corner portions 11, 13, 14, and 16 are formed wider than the side center portions 12 and 15 as illustrated in FIG. The In such a form, the corner portion is preferentially in contact with the inner wall of the frame and the guide of the line rather than the center portion of the side, and contact at the center portion of the side is prevented, so that the adhesive force due to contact can be further reduced. The present invention can be particularly advantageously applied to a large area optical member. In addition, the said corner | angular part wide form may be formed by appropriate | suitable systems, such as the system which provides a protrusion part in a corner | angular part.
[0021]
In the above, the side where the corner is formed wider than the center of the side may be one side of the rectangular body, or may be two opposite sides or all sides as shown in the figure. Can be determined. The width difference between the corner and the side center is preferably 1 to 100 μm, especially 2 to 50 μm, from the viewpoint of preventing contact at the side center and preventing appearance defects.
[0022]
【Example】
Example 1
An 80 μm thick triacetylcellulose film is bonded to both sides of a 90 cm wide and 70 μm thick polyvinyl alcohol polarizing film via an acrylic pressure sensitive adhesive layer having a thickness of 20 μm, and the thickness is thickened on one side. A 25 μm thick polyester film treated with a silicone release agent is bonded to a 20 μm thick acrylic pressure sensitive adhesive layer together with the separator. Then, the laminate was punched out, 50 of them were stacked, and the cut surface was polished with 60th sandpaper to obtain an optical member.
[0023]
Example 2
Before polishing with sand paper, an optical member was obtained according to Example 1 except that the cut surface was cut to a smooth surface.
[0024]
Comparative Example An optical member was obtained in the same manner as in Example 1 except that the punched body itself was not subjected to polishing treatment with sandpaper.
[0025]
When the optical members obtained in the evaluation test example and the comparative example were transported one by one at a predetermined interval on a conveyor equipped with a stainless steel guide, in Examples 1 and 2, they were transported normally without stagnation in the middle. However, in the comparative example, troubles that stagnate during transportation frequently occurred.
[Brief description of the drawings]
FIG. 1 is a perspective sectional view of an embodiment. FIG. 2 is a front sectional view of another embodiment. FIG. 3 is a plan view of still another embodiment.
1, 4: Optical film layer 2: Pressure-sensitive adhesive layer 3: Separator

Claims (2)

It consists of a laminate having at least an optical film layer and a pressure-sensitive adhesive layer, the edges of the laminate are formed on a rough surface with fine irregularities , and the laminate is a rectangular body, and the rectangular body An optical member characterized in that the corner portion has at least one side formed wider than the side center portion . Oite to claim 1, the optical member protruding width of the convex portion is 1~100μm in the rough surface formed end-edge of the fine irregularities.

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