JP2002040206A - Antireflection cover member and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antireflection cover member having a superior antireflection effect and a method for producing the member. SOLUTION: At least a low reflection layer 6 is formed on one face or both faces of a transparent substrate 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antireflection cover member which can be used as a cover part of a display portion of a cellular phone, a video camera, a digital camera, an automobile device and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In a mobile phone, a video camera, a digital camera, an automobile device, etc., a display portion is
It is configured by a combination with a liquid crystal panel or an organic EL panel. Especially in mobile devices such as mobile phones, the display part is often exposed,
With the purpose of preventing damage to the LCD panel, enlarging the display of the LCD panel, and decorating the vicinity of the LCD panel, a transparent substrate molded into a convex lens shape and a transparent substrate with a pattern such as a border are formed. It is covered by the configured cover parts.

[0003]

However, the cover component usually has an air layer between the liquid crystal panel and the cover component due to the space between the liquid crystal panel and the cover component. When light from the liquid crystal panel passes through the cover component, reflection occurs on the back surface of the cover component. In such a cover part, when the transparent substrate is made of an acrylic resin, the refractive index of the acrylic resin is 1.48, which is higher than the refractive index of the air layer of 1.0. % Reflectance. Therefore, since the light from the back surface of the cover component is reflected and the visibility is reduced, there is a demand to suppress the reflected light as much as possible.

Further, as the colorization of the liquid crystal panel progresses, the reflected light from the back surface of the cover component affects the contrast of the display display and degrades the display quality. I have.

Accordingly, it is an object of the present invention to provide an anti-reflection cover member having an excellent anti-reflection effect and a method of manufacturing the same, which solves the above-mentioned drawbacks.

[0006]

An anti-reflection cover member and a method of manufacturing the same according to the present invention are configured as follows to achieve the above object.

That is, the antireflection cover member of the present invention is configured such that at least one low reflection layer is formed on one or both surfaces of the transparent substrate.

In the above invention, the transparent substrate may be configured such that at least one of a protective layer and a design layer is formed on one or both sides.

Further, in the above invention, a configuration may be adopted in which an antifouling layer is formed on the low reflection layer.

Further, in the method of manufacturing an antireflection cover member according to the present invention, a transfer material having at least a protective layer or a pattern layer formed on a base sheet is placed in a mold such that the base sheet side is in contact with the cavity surface; Injecting a transparent molten resin into a mold to obtain an integrated product of a transparent substrate made of resin and a transfer material, then peeling off the base sheet of the transfer material, and then forming a low reflection layer on one or both sides Configured.

In the above invention, the method for forming the low reflection layer may be a printing method, a coating method, a dipping method, a vapor deposition method or a sticking method.

In the above invention, an antifouling layer may be formed on the low reflection layer by a printing method, a coating method, a dipping method or a vapor deposition method.

[0013]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the antireflection cover member of the present invention. FIG. 2 is a sectional view showing a transfer material used in the method for manufacturing an antireflection cover member of the present invention. FIG. 3 is a cross-sectional view showing one step of the method for manufacturing the antireflection cover member of the present invention. In the figure, 1 is an antireflection cover member, 2 is a transparent substrate, 3 is an adhesive layer, 4 is a design layer,
5 is a protective layer, 6 is a low reflection layer, 7 is an antifouling layer, 8 is a transfer material,
Reference numeral 9 denotes a base sheet, 10 denotes a transfer layer, and 11 denotes a mold.

The anti-reflection cover member 1 of the present invention has at least a low reflection layer 6 formed on one or both sides of a transparent substrate 2 (see FIG. 1).

On the surface of the transparent substrate 2, a pattern layer 4, a protective layer 5, an antifouling layer 7 and the like may be formed as required.

On the surface of the transparent substrate 2, a pattern layer 4 and a protective layer 5
In order to form such a material, it is preferable to use a molding simultaneous transfer method using the transfer material 8. The transfer material 8 has a design layer 4 and a protective layer 5 formed on a base sheet 9 as a transfer layer 10 (see FIG. 2).

The base sheet 9 may be made of a polypropylene resin, a polyethylene resin, a polyamide resin,
A resin sheet such as a polyester resin, an acrylic resin, and a polyvinyl chloride resin can be used.

When the transfer layer 10 has good releasability from the base sheet 9, the transfer layer 10 may be provided directly on the base sheet 9. In order to improve the releasability of the transfer layer 10 from the base sheet 9, a release layer may be formed over the entire surface before the transfer layer 10 is provided on the base sheet 9.

The release layer is a layer for improving the releasability of the transfer layer 10. Examples of the material of the release layer include acrylic resin, polyester resin, polyvinyl chloride resin, cellulose resin, rubber resin, polyurethane resin, polyvinyl acetate resin, and the like, as well as vinyl chloride-vinyl acetate copolymer. It is preferable to use a resin or a copolymer such as an ethylene-vinyl acetate copolymer resin. As a method for forming the release layer, there are a coating method such as a gravure coating method, a roll coating method, and a comma coating method, and a printing method such as a gravure printing method and a screen printing method.

The protective layer 5 is formed entirely on the base sheet 9 or the release layer. When the base sheet 9 is peeled off after the simultaneous transfer of the molding, the protective layer 5 is peeled off from the base sheet 9 or the release layer and becomes the outermost surface of the transferred object, and serves as a layer for increasing the surface strength of the antireflection cover member 1. .

As the protective layer 5, a reactive diluent was mixed with a composition of a prepolymer or oligomer having a polymerizable double bond or a prepolymer or oligomer having an epoxy group, and a photopolymerization initiator was added as required. A compound may be used. Specifically, a resin used as an ultraviolet curable resin or an electron beam curable resin may be used. As a method for forming the protective layer 5, a gravure coating method,
There are coating methods such as a roll coating method and a comma coating method, and printing methods such as a gravure printing method and a screen printing method.

The design layer 4 is usually formed as a printing layer. As the material of the printing layer, a polyvinyl resin, a polyamide resin, a polyester resin, an acrylic resin, a polyurethane resin, a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin,
It is preferable to use a coloring ink containing a resin such as an alkyd resin as a binder and a pigment or dye of an appropriate color as a coloring agent. As a method for forming the printing layer, a normal printing method such as an offset printing method, a gravure printing method, or a screen printing method may be used. The printing layer is usually provided partially.

The design layer 4 may be composed of a metal thin film layer or a combination of a printing layer and a metal thin film layer. The metal thin film layer is for expressing metallic luster as the design layer 4, and is formed by a vacuum evaporation method, a sputtering method, an ion plating method, a plating method, or the like. Depending on the metallic gloss color you want to express, aluminum,
Metals such as nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, and zinc, and alloys or compounds thereof are used. The metal thin film layer is usually formed partially. Further, when providing the metal thin film layer, a front anchor layer or a rear anchor layer may be provided in order to improve adhesion to other layers.

Further, an adhesive layer 3 may be formed on the transparent substrate 2 in order to adhere the above layers. As the adhesive layer 3, a heat-sensitive or pressure-sensitive resin suitable for the material of the transparent substrate 2 is appropriately used.

For example, when the material of the transparent substrate 2 is an acrylic resin, it is preferable to use an acrylic resin. When the material of the transparent substrate 2 is a polyphenylene oxide / polystyrene resin, a polycarbonate resin, or a polystyrene blend resin, an acrylic resin, a polystyrene resin, a polyamide resin, or the like having an affinity for these resins may be used. I just need. Further, when the material of the transparent substrate 2 is a polypropylene resin, a chlorinated polyolefin resin,
Chlorinated ethylene-vinyl acetate copolymer resin, cyclized rubber,
Coumarone indene resin can be used. As a method for forming the adhesive layer 3, a gravure coating method, a roll coating method,
There are a coating method such as a comma coating method and a printing method such as a gravure printing method and a screen printing method.

The structure of the transfer layer 10 is not limited to the above-described embodiment. For example, when a material having excellent adhesion to the transparent substrate 2 is used as the material of the design layer 4, the adhesive layer 3 can be omitted.

Next, a simultaneous molding transfer method for forming the protective layer 5 and the design layer 4 on the transparent substrate 2 using the transfer material 8 will be described (see FIG. 3).

First, the transfer material 8 is fed into a molding die 11 composed of a movable die and a fixed die such that the base sheet 9 contacts the cavity surface (see FIG. 3). At this time, the sheet-like transfer material 8 may be fed one by one, or a necessary portion of the long transfer material 8 may be sent intermittently. When a long transfer material 8 is used, it is preferable to use a feeding device having a positioning mechanism so that the register between the design layer 4 and the like of the transfer material 8 and the molding die 11 match. Further, when the transfer material 8 is intermittently fed, if the transfer material 8 is fixed by the movable type and the fixed type after the position of the transfer material 8 is detected by the sensor, the transfer material 8 is always kept at the same position. It can be fixed, and there is no displacement of the design layer 4, which is convenient.

After the molding die 11 is closed, the molten resin is injected and filled into the die 11 from the gate, and simultaneously with forming the transparent substrate 2, the transfer material 8 is adhered and integrated.

As the molding resin, a polystyrene resin,
General-purpose resins such as polyolefin resins, ABS resins, AS resins, and AN resins can be given. In addition, polyphenylene oxide polystyrene resin, polycarbonate resin, polyacetal resin, acrylic resin,
General-purpose engineering resins such as polycarbonate-modified polyphenylene ether resin, polybutylene terephthalate resin, ultra-high molecular weight polyethylene resin, polysulfone resin, polyphenylene sulfide resin, polyphenylene oxide resin, polyarylate resin, polyetherimide resin, polyimide resin, liquid crystal polyester A super engineering resin such as a resin or a polyallyl heat resistant resin can also be used.

After cooling the resin molded product as the transparent substrate 2, the molding die 11 is opened and the resin molded product is taken out. Finally, the base sheet 9 of the transfer material 8 is peeled off. Thus, only the transfer layer 10 can be transferred to the transparent substrate 2.

The shape of the anti-reflection cover member 1 may be a flat plate or a two-dimensional or three-dimensional curved surface.

The low reflection layer 6 is a layer for preventing reflection of the transparent substrate 2. The low reflection layer 6 is formed entirely or partially on one or both surfaces of the transparent substrate 2.

As the low refraction material used for the low reflection layer 6,
Metal oxides such as magnesium fluoride and silicon oxide can be used. Further, an organometallic compound containing at least one of silica and organopolysiloxane can also be used. Further, a porous body of these organometallic compounds can also be used. It is also possible to use an organic compound such as a fluorine-based synthetic resin.

The low-reflection layer 6 may be composed of silicon oxide or aluminum oxide having fine pores dispersed in silicon oxide and used as a single layer, magnesium fluoride as a single layer, or a titanium oxide layer / oxide. Silicon layer 2
It can be used as a low-reflection layer 6 having a layer structure,
4 like silicon oxide layer / titanium oxide layer / silicon oxide layer
The low-reflection layer 6 having a multilayer configuration using multiple interference, such as the low-reflection layer 6 having a layer configuration, may be used.

The method of manufacturing these low reflection layers 6 is as follows.
There are a vacuum deposition method, a sputtering method, an ion plating method, and the like. Alternatively, an organic metal compound such as a metal alcoholate or a metal chelate is applied onto the transparent substrate 2 by an immersion method, a printing method, a coating method, or the like, and then a metal oxide film is formed by light irradiation or drying to form a low reflection layer. There is a way to get 6. There is also a method of attaching a low reflection film.

The thickness of the low reflection layer 6 may be appropriately selected in the range of 0.01 to 2 μm. Depending on the refractive index of the low refractive material, these film thicknesses can be represented by the general formula n × d = λ / 4 or the general formula n × d = 3λ / 4 (where n is the refractive index of the low refractive material,
d is the thickness of the low-refractive material, and λ is the low reflection center wavelength).

Further, an antifouling layer 7 may be provided as needed. The antifouling layer 7 is a layer provided on the low reflection layer 6 to prevent the antireflection cover member 1 from being contaminated. As the antifouling layer 7, it is preferable to use a surfactant having fluorine in a terminal group. The antifouling layer 7 may be provided by a coating method, a dipping method, a vacuum deposition method, or the like. The thickness of the antifouling layer 7 is preferably as thin as possible. This is because the light transmittance of the antireflection cover member 1 decreases when the thickness of the antifouling layer 7 is large.

The anti-reflection cover member 1 can be obtained as described above.

[0041]

EXAMPLE A polyethylene terephthalate film having a thickness of 38 μm was used as a base sheet, and a protective layer made of an ultraviolet curable resin, a pattern layer made of an acrylic resin, and an adhesive layer made of a vinyl resin were sequentially formed thereon by gravure printing. Thus, a transfer material was obtained.

A transfer material was placed in a molding die for molding a cover part of a display portion of a mobile phone such that the base sheet side was in contact with the cavity surface.

Next, a transparent acrylic resin was injected into the mold to obtain an integrated product of a transparent substrate made of resin and a transfer material.

Next, when the base sheet of the transfer material was peeled off, an adhesive layer, a design layer, and a protective layer were sequentially laminated on the surface of the transparent substrate.

Next, E and E were formed on the front and back surfaces of the transparent substrate, respectively.
In a B vacuum evaporation apparatus, SiO ₂ , TiO ₂ , SiO
₂ , TiO ₂ , SiO ₂ films of 15 nm and 15 n respectively
m, 250 nm, 135 nm, and 15 nm in thickness to form low-reflection layers.

Next, on the low-reflection layer on the front surface side of the transparent substrate, a fluorine-based material having a thickness of 1.
The film was formed to a thickness of 0 to 2.0 nm to form an antifouling layer.

The anti-reflection cover member, which is the cover part of the display portion of the mobile phone, obtained at this time had a reflectance of 0.8% at a wavelength of 550 nm, and had an excellent anti-reflection effect.

[0048]

Since the present invention employs the above-described configuration, the following effects can be obtained.

The anti-reflection cover member of the present invention has an excellent anti-reflection effect because the low reflection layer is formed at least on one or both surfaces of the transparent substrate.

Further, according to the method of manufacturing an antireflection cover member of the present invention, a transfer material having at least a protective layer or a design layer formed on a base sheet is placed in a mold such that the base sheet side is in contact with the cavity surface, Injecting a transparent molten resin into a mold to obtain an integrated product of a transparent substrate made of resin and a transfer material, then peeling off the base sheet of the transfer material, and then forming a low reflection layer on one or both sides Because we configured
An antireflection cover member having an excellent antireflection effect can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an antireflection cover member of the present invention.

FIG. 2 is a sectional view showing a transfer material used in the method for manufacturing an antireflection cover member of the present invention.

FIG. 3 is a cross-sectional view showing one step of the method for manufacturing the antireflection cover member of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anti-reflection cover member 2 Transparent substrate 3 Adhesive layer 4 Pattern layer 5 Protective layer 6 Low-reflection layer 7 Antifouling layer 8 Transfer material 9 Base sheet 10 Transfer layer 11 Mold

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H100 AA01 AA41 AA61 BB03 BB06 CC07 EE00 EE06 2K009 AA04 AA05 AA07 BB14 BB24 CC03 CC06 CC09 CC26 CC42 DD03 DD04 DD07 EE05 4K029 AA11 BA42 BA46 BA48 BB02 BB03 A0711 MM24 MM25 QQ05 RR06

Claims (6)

[Claims] 1. An anti-reflection cover member, wherein a low reflection layer is formed at least on one or both sides of a transparent substrate. 2. The anti-reflection cover member according to claim 1, wherein the transparent substrate has at least one of a protective layer and a design layer formed on one or both surfaces. 3. The antireflection cover member according to claim 1, wherein an antifouling layer is formed on the low reflection layer. 4. A transfer material having at least a protective layer or a pattern layer formed on a base sheet is placed in a mold such that the base sheet side is in contact with the cavity surface, and a transparent molten resin is injected into the mold. A method for producing an antireflection cover member, comprising: obtaining an integrated product of a transparent substrate made of a resin and a transfer material; removing a base sheet of the transfer material; and forming a low-reflection layer on one or both surfaces. 5. The method for forming a low reflection layer is a printing method, a coating method, a dipping method, a vapor deposition method or a sticking method.
A method for producing the antireflection cover member according to the above. 6. The method for producing an antireflection cover member according to claim 4, wherein an antifouling layer is formed on the low reflection layer by a printing method, a coating method, a dipping method, or a vapor deposition method.