JPH10186129A - Optical components - Google Patents

Abstract

(57) [Summary] [Problem] It is excellent in detachability when replacing the mounted object in the frame, it is difficult to generate adhesion to the guide surface that disturbs normal running during line transfer such as manufacturing and processing, and it is normal transfer. Maintainability of the state,
Furthermore, the development of optical members with excellent manufacturing and processing efficiency. An optical member comprising a laminate having at least an optical film layer (1) and a pressure-sensitive adhesive layer (2), wherein the edges of the laminate are formed on a rough surface having fine irregularities. [Effect] The edge formed on the rough surface of the fine unevenness reduces the contact area with the inner wall of the frame such as the frame in the display device or the guide surface of the manufacturing / processing line or the like, thereby reducing the adhesive strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical member which does not easily adhere to a smooth surface and is excellent in exchangability of a body mounted in a frame and line transportability.

[0002]

2. Description of the Related Art Conventionally, after a laminated raw material provided with a pressure-sensitive adhesive layer on a long optical film is cut into a predetermined size, measures are taken to prevent minute cracks generated by the cutting and protrusion of the pressure-sensitive adhesive layer. For this reason, there has been known an optical member in which a cut surface of a cut laminate is smoothed by cutting or the like (Japanese Patent Application Laid-Open No. 61-136746).

However, when replacing the optical member mounted in a frame such as a frame of a display device, it is difficult to remove the optical member because the end face of the optical member is adhered to the inner wall of the frame, and it is difficult to remove the optical member. When transporting on the line, the end surface of the optical member adheres to the guide surface of the line to disturb the traveling, and the normal transport state is impaired, and there is a problem that the efficiency of manufacturing and processing is greatly reduced. .

[0004]

The present invention has excellent removability at the time of replacement of a mounted object in a frame, and is unlikely to adhere to a guide surface which disturbs normal running during line conveyance such as manufacturing or processing, and can be used normally. It is an object of the present invention to develop an optical member that is excellent in maintainability of a good transport state, and that is excellent in efficiency of manufacturing and processing.

[0005]

According to the present invention, there is provided an optical member comprising a laminate having at least an optical film layer and a pressure-sensitive adhesive layer, wherein an edge of the laminate is formed on a rough surface having fine irregularities. Is provided.

[0006]

According to the present invention, the edge formed on the rough surface of the fine irregularities reduces the contact area with the inner wall of the frame such as the frame in the display device or the guide surface of the manufacturing / processing line or the like, thereby reducing the adhesive strength. It is hard to adhere to the guide surface that disturbs normal running during line transfer such as manufacturing and processing, and it is easy to maintain, As a result, it is possible to obtain an optical member that is excellent in the efficiency of manufacturing, processing, and the like.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The optical member of the present invention comprises a laminate having at least an optical film layer and a pressure-sensitive adhesive layer, and the laminate has an edge formed on a rough surface having fine irregularities. Examples thereof are shown in FIGS. Reference numerals 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 an appropriate film exhibiting arbitrary optical characteristics such as, for example, polarization, retardation, reflection and diffusion, antireflection, interference, and diffraction. The laminate is, for example, a polarizing plate or a retardation plate,
It may be a laminate in which two or more suitable optical films such as a reflection plate, a diffusion plate, an antireflection plate, an interference plate, and a diffraction plate are included via a pressure-sensitive adhesive layer.

Examples of the polymer forming the optical film include polyester-based, cellulose-based, polyethersulfone-based and polycarbonate-based, polyamide-based and polyimide-based plastics, polyolefin-based and acrylic-based plastics, and acrylic-based and urethane-based plastics. Examples thereof include a thermosetting resin such as an acrylic urethane type, an epoxy type, and a silicone type, or an ultraviolet curable resin, various liquid crystal polymers, and the like, but are not limited thereto, and the polymer is arbitrary.

[0010] Incidentally, a polarizing plate is formed by adding iodine and / or a dichroic dye to a hydrophilic polymer film such as a polyvinyl alcohol-based film, a partially formalized polyvinyl alcohol-based film, and an ethylene / vinyl acetate copolymer-based partially saponified film. Stretched by adsorbing, a polyene oriented film such as a polyvinyl alcohol-based dehydrated product or a polyvinyl chloride dehydrochlorinated product, or a polarizing film with a transparent protective film attached to one or both sides of such a polarizing film Is common.

The transparent protective film layer provided for the purpose of preventing the above-mentioned surface damage of the polarizing plate and the like is usually formed of an isotropic transparent film. The retardation plate is formed of a stretched film, a liquid crystal polymer film, or the like, and the reflection plate is, for example, a film obtained by attaching a foil or a vapor-deposited film made of a reflective metal such as aluminum to one surface of a matted film, if necessary. It is formed as a film in which a metal reflection layer is provided by a suitable method such as a vapor deposition method or a plating method on a film having a fine surface uneven structure by adding fine particles.

On the other hand, the diffusion plate and the antireflection plate are formed as, for example, a matted film or a film having a fine irregular surface structure by adding fine particles, and the interference plate is formed by providing a coherent thin film on the film. Is formed as
The diffraction plate is formed as a film provided with fine irregularities and grooves lines. Therefore, as described above, the optical film may be made of a film to which appropriate characteristics such as isotropic and anisotropic properties are imparted.

The type of the pressure-sensitive adhesive layer attached to the optical film is not particularly limited, and is, for example, an appropriate transparent pressure-sensitive adhesive made of acrylic, silicone, polyester, polyurethane, polyether, or rubber. It may be formed using an agent. The thickness of the pressure-sensitive adhesive layer is 500 μm or less, preferably 1 to 300 μm, particularly 5 to 10 μm.
0 μm is common, but not limited to this.

The pressure-sensitive adhesive layer may be made of, for example, natural or synthetic resins, glass fibers or glass beads, if necessary.
Appropriate additives such as fillers, pigments, colorants and antioxidants made of metal powders and other inorganic powders may be contained. In addition, light-diffusing properties may be exhibited by the inclusion of fine particles.

The above-mentioned optical film and pressure-sensitive adhesive layer are treated with an ultraviolet absorbent such as a salicylate compound, a benzophenol compound, a benzotriazole compound, a cyanoacrylate compound or a nickel complex compound. May have an ultraviolet absorbing ability.

When the pressure-sensitive adhesive layer is exposed in the laminate, it is preferable to temporarily protect the separator 3 as shown in FIG. The separator can be obtained as, for example, a film coated with an appropriate release agent such as a silicone-based, long-chain alkyl-based, or fluorine-based release agent, or a laminate thereof.

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 size. The laminate according to the present invention has its edges formed on a rough surface having fine irregularities. Such a rough surface is formed by stacking the raw material or the laminate after being cut into a predetermined size as necessary, and cutting the cut surface. The required surface can be formed by an appropriate method such as a method of blowing sand blast of 1 mm or less or a method of polishing with sandpaper of 40 or less.

In the above description, the end surface formed as a rough surface is preferably around the optical member when the frame is worn inside, and may be brought into contact with a line guide when being conveyed on a line such as manufacturing or processing. Preferably, they are opposing sides. In the above-described roughening treatment, a smoothing treatment such as cutting for the purpose of preventing the generation of fine cracks and the protrusion of the pressure-sensitive adhesive layer as in the prior art may be used together.

The state of the fine irregularities on the rough surface formed on the edge is preferably such that the protrusion width of the convex portion is 1 μm or more from the viewpoint of the low adhesive force generated by contact with the smooth surface. Further, the thickness is preferably 100 μm or less from the viewpoint of preventing handling of defective products due to deterioration of appearance. A more preferable protrusion width of the projection is 2 to 50 μm.

When the laminated body as the optical member is formed of a rectangular body, the corners 11, 13, 1 as shown in FIG.
4 and 16 may be formed wider than the side center portions 12 and 15. In such a form, the corner portion contacts the inner wall of the frame or the line guide preferentially over the center of the side, and the contact at the center of the side is prevented, so that the adhesive force due to the contact can be further reduced, It can be particularly advantageously applied to a large-area optical member. Note that the wide corner portion may be formed by an appropriate method such as a method of providing a protrusion at the corner.

In the above, the side in which the corner is formed wider than the center of the side may be one side of a rectangular body, two opposite sides, or all sides as shown in the figure. Well, it can be determined appropriately. Further, the width difference between the corner and the center of the side is preferably 1 to 100 μm, more preferably 2 to 50 μm, from the viewpoint of preventing contact at the center of the side and preventing poor appearance.

[0022]

【Example】

Example 1 An 80 μm-thick triacetyl cellulose film was adhered to both sides of a long web of a polyvinyl alcohol-based polarizing film having a width of 90 cm and a thickness of 70 μm via an acrylic pressure-sensitive adhesive layer having a thickness of 20 μm. A 20-μm-thick acrylic pressure-sensitive adhesive layer provided on a separator obtained by treating a 25-μm-thick polyester film on one side with a silicone-based release agent was adhered together with the separator, and 12.1 inches of the laminated raw material was passed through a blade mold. The laminate was punched out in an LCD size, 50 of them were stacked, and the cut surface was polished with a sandpaper of No. 60 to obtain an optical member.

Example 2 An optical member was obtained in the same manner as in Example 1 except that the cut surface was cut into a smooth surface before polishing with sandpaper.

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 sandpaper polishing treatment.

Evaluation Test When the optical members obtained in Examples and Comparative Examples were conveyed one by one at predetermined intervals by a conveyor equipped with a stainless steel guide, in Examples 1 and 2, there was no stagnation on the way. Although it could be conveyed normally, in the comparative example, troubles that stagnated during the conveyance 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 an explanatory plan view of still another embodiment.

[Explanation of symbols]

 1, 4: optical film layer 2: pressure-sensitive adhesive layer 3: separator

Claims (3)

[Claims] 1. An optical member comprising a laminate having at least an optical film layer and a pressure-sensitive adhesive layer, wherein an edge of the laminate is formed on a rough surface having fine irregularities. 2. The optical member according to claim 1, wherein the laminate is formed of a rectangular body, and the corner has at least one side formed wider than the center of the side. 3. A projection according to claim 1, wherein the projection width of the projection at the edge formed on the rough surface of the fine irregularities is 1 to 100.
Optical member that is μm.