JP4253862B2 - Antireflection film - Google Patents

Antireflection film Download PDF

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Publication number
JP4253862B2
JP4253862B2 JP11222198A JP11222198A JP4253862B2 JP 4253862 B2 JP4253862 B2 JP 4253862B2 JP 11222198 A JP11222198 A JP 11222198A JP 11222198 A JP11222198 A JP 11222198A JP 4253862 B2 JP4253862 B2 JP 4253862B2
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Japan
Prior art keywords
film
layer
antireflection
thin film
transparent thin
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JP11222198A
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Japanese (ja)
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JPH11305008A (en
Inventor
伸二 斉藤
信吾 大野
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Bridgestone Corp
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Bridgestone Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、反射防止フィルムに係り、特に、耐候性、耐久性に優れ、表示板、ディスプレイ、電光掲示板の表面材に貼着する反射防止フィルムとして好適な反射防止フィルムに関する。
【0002】
【従来の技術】
表示板、ディスプレイ、電光掲示板等の表面材では、外光や照明光、或いは、周囲の明るい風景がその表面で反射して像が写ることにより、視認性が低下する。このため、このような反射を低減するために、表面材(外側のカバー材やフィルタの表面を含む)に、微細な凹凸加工のアンチグレア処理を施したり、薄膜をコーティングしたりすることにより、光の干渉で反射を低減する反射防止処理が施される場合がある。これらの反射防止処理は、表面材に直接施すと、コストアップを招くことから、反射防止処理を施したフィルムを表面材に貼着する方法が、近年多く採用されるようになってきている。
【0003】
通常の場合、従来の反射防止フィルムは、図2に示す如く、有機フィルムよりなるベースフィルム1上にアクリル樹脂やシロキサン等よりなる硬い保護層としてのハードコート層2が3〜20μm程度の厚さに形成され、更にこの上にアンチグレア、反射防止膜等の反射防止層3が形成された構造とされており、この反射防止フィルム4は、ディスプレイ等の表面材5に接着剤6で接着される。
【0004】
【発明が解決しようとする課題】
従来の反射防止フィルムでは、使用中の熱や湿度、その他の環境条件の影響を受け易く、ベースフィルム1とハードコート層2との界面で剥離が生じる場合がある。この場合には、当然、反射防止層3も脱落してしまうため、反射防止フィルムとしての機能を奏し得なくなる。
【0005】
また、使用初期において、ベースフィルム1とハードコート層2との密着性が良好な場合であっても、特に、ベースフィルム1がPETフィルムであるような場合には、周囲環境の影響、特に直射日光やその他の紫外線の影響でフィルムが劣化し、ハードコート層が外力で容易に剥がれ落ちたり、紫外線による劣化でフィルムが黄変し、各種表示板の表面材のカバーフィルムとしては適用し得なくなる。
【0006】
本発明は上記従来の問題点を解決し、耐候性、耐久性に優れ、膜剥離や黄変等の問題を引き起こすことなく、長期間使用可能な反射防止フィルムを提供することを目的とする。
【0007】
【課題を解決するための手段】
本発明の反射防止フィルムは、有機フィルムの表面に、ハードコート層が設けられ、該ハードコート層上に反射防止層が設けられている反射防止フィルムにおいて、該反射防止層は、400nm付近の光の通過性が高く、350nm付近及びそれ以下の光の吸収が多い材料を用いた高屈折率透明薄膜を有する紫外線カット層であり、該反射防止フィルムの365nmにおける光線透過率が40%以下である反射防止フィルムであって、前記反射防止層が、高屈折率透明薄膜/低屈折率透明薄膜/高屈折率透明薄膜/低屈折率透明薄膜の順で1層ずつ、合計4層に積層したものであり、前記高屈折率透明薄膜がITO又はZnOよりなり、前記低屈折率透明薄膜がSiO よりなることを特徴とする。
【0008】
365nmにおける光線透過率が40%以下の反射防止フィルムであれば、紫外線等の周囲環境に大きな影響を及ぼされることなく、耐候性、耐久性に優れるため、黄変や膜剥離の問題は防止される。
【0009】
【発明の実施の形態】
以下に図面を参照して、本発明の実施の形態を詳細に説明する。
【0010】
図1(a),(b)は参考例の反射防止フィルムを示す模式的な断面図であり、図1(c)は本発明の反射防止フィルムの実施の形態を示す模式的な断面図である。
【0011】
本発明の反射防止フィルムは、フィルムの365nmの波長の光に対する光線透過率が40%以下のものであるが、この光線透過率が40%を超えるものでは、紫外線等による劣化の問題があり、黄変、膜剥離が生じる。
【0012】
この光線透過率は低い程好ましく、本発明において、365nmにおける光線透過率は好ましくは30%以下であり、350nmの波長の光に対する光線透過率が20%以下、特に10%以下、とりわけ5%以下であることが望ましい。
【0013】
このような本発明の反射防止フィルムは、例えば、下記(3)の構成とすることにより実現することができる。
【0014】
(1) 図1(a)に示す如く、ベースフィルム1とハードコート層2との間に紫外線カット層7を介在させた反射防止フィルム4A。
(2) 図1(b)に示す如く、ハードコート層自体を紫外線カットハードコート層2Aとした反射防止フィルム4B。
(3) 図1(c)に示す如く、反射防止層自体を紫外線カット反射防止層3Bとした反射防止フィルム4C。
【0015】
本発明において、ベースフィルム1となる有機フィルムとしては、ポリエステル、ポリエチレンテレフタレート(PET)、ポリブチレンテレフタレート、ポリメチルメタアクリレート(PMMA)、アクリル、ポリカーボネート(PC)、ポリスチレン、トリアセテート、ポリビニルアルコール、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリエチレン、エチレン−酢酸ビニル共重合体、ポリウレタン、セロファン等、好ましくはPET、PC、PMMAの透明フィルムが挙げられる。
【0016】
有機フィルムの厚さは得られる反射防止フィルムの用途による要求特性(例えば、強度、薄膜性)等によって適宜決定されるが、通常の場合、1μm〜10mmの範囲とされる。
【0017】
図1(a)に示す如く、紫外線カット層7を形成する場合、この紫外線カット層7としては、アクリル樹脂、ウレタン樹脂、シリコーン樹脂、エポキシ樹脂等の適当なコーティング材に公知の紫外線吸収材を0.05〜10重量%程度配合してベースフィルム1上にコーティングすれば良い。このようにして形成される紫外線カット層7の厚さは0.5〜20μm程度とするのが好ましい。
【0018】
ハードコート層2は、アクリル樹脂、シリコーン樹脂等の通常のハードコート材をコーティングすることにより形成することができる。ハードコート層自体を紫外線カット性とする場合、紫外線カットハードコート層2Aは、このようなハードコート材に公知の紫外線吸収材を0.05〜5重量%程度配合してコーティングすることにより形成することができる。ハードコート層2又は紫外線カットハードコート層2Aの厚さは1〜20μm程度とするのが好ましい。
【0019】
反射防止層2としては、次のような構成のものを用いることができる
【0020】
屈折率透明薄膜/低屈折率透明薄膜/高屈折率透明薄膜/低屈折率透明薄膜の順で1層ずつ、合計4層に積層したも
こで、高屈折率透明薄膜としては、ITO(スズインジウム酸化物)又はZnO、AlをドープしたZnOの屈折率1.8以上の薄膜を採用することができる。
【0021】
また、低屈折率透明薄膜としては、SiO 屈折率が1.6以下の薄膜を採用することができる。
【0022】
これら高屈折率透明薄膜及び低屈折率透明薄膜の膜厚は、光の干渉で可視光領域での反射率を下げることができるように、膜構成、膜種、中心波長等により適宜決定される。
【0023】
このような透明薄膜は、蒸着、スパッタリング、イオンプレーティング、CVD、マイクログラビアコーティング、ダイレクトグラビアコーティング、スロットダイコーティング法等により形成することができる。
【0024】
特に、本発明では、反射防止層自体を紫外線カット性とするために、高屈折率透明薄膜の材料として400nm付近の光の通過性が高く、350nm付近及びそれ以下の光の吸収が多い材料を用いる。このような材料としては、ITO、ZnOが挙げられる。
【0025】
なお、本発明の反射防止フィルムでは、紫外線カット反射防止層3Aの上に更にフッ素系有機薄膜等の防汚層を形成しても良く、この場合、防汚層の材料としては、FEP(フルオロエチレン−プロピレン共重合体)、PTFE(ポリテトラフルオロエチレン)、ETFE(エチレン−テトラフルオロエチレン共重合体)、PVF(ポリフッ化ビニル)、PVDF(ポリフッ化ビリニデン)等が挙げられる。
【0026】
このような本発明の反射防止フィルムは、OA機器のPDPや液晶板の前面フィルタ等の各種表示材の前面に貼着する反射防止フィルムとして極めて有用であり、黄変や膜剥離の問題を生じることなく、長期に亘り良好な反射防止機能を示す。
【0027】
【実施例】
以下に参考例、実施例及び比較例を挙げて本発明をより具体的に説明する。
【0028】
参考例1
市販のPETフィルム(東レ社製「ルミラー#188」厚さ188μm)の表面に、アクリル樹脂に紫外線吸収剤(ムサシノガイギー社製「チタビンP」)を2.0重量%混合したコーティング液をコーティングして厚さ2μmの紫外線カット層を形成し、この上に市販のハードコート材(JSR社製「Z7002」)をコーティングして厚さ6μmのハードコート層を形成し、更にこの上に下記4層積層構造の反射防止層を反応性スパッタ法により形成して反射防止フィルムを製造した。
【0029】
[反射防止層構造]
1層目(反射防止層側) :TiO、厚さ13nm
2層目 :SiO、厚さ20nm
3層目 :TiO、厚さ110nm
4層目 :SiO、厚さ85nm
この反射防止フィルムについて、日立自走式分光光度計を用いて365nm及び350nmにおける光線透過率を調べ、結果を表1に示した。
【0030】
また、この反射防止フィルムについて、スーパーUV耐光試験機(アイグラフィックス社製)で30時間の耐候劣化試験を行い、この試験前後での黄色度(YI値:スガ試験機社製カラーコンピュータで測定)と膜の密着度(JIS K−5400 ゴバン目テ−プ試験(5×5)により測定)を調べ、結果を表1に示した。
【0031】
参考例2
市販のPETフィルム「ルミラー#188」の表面に、市販のハードコート材「Z7002」に紫外線吸収剤「チタビンP」を0.5重量%混合したものをコーティングして厚さ8μmの紫外線カットハードコート層を形成し、この上に、実施例1と同様にして反射防止層を形成して反射防止フィルムを製造した。
【0032】
この反射防止フィルムについて、参考例1と同様にして光線透過率及び耐候劣化試験前後の黄色度と膜の密着度を調べ、結果を表1に示した。
【0033】
実施例1
市販のハードコートPETフィルム(東レ社製「ルミラーCOTO」厚さ188μm)の表面に下記4層積層構造の紫外線カット反射防止層をスパッタ法により形成して本発明の反射防止フィルムを製造した。なお、ITOの成膜には焼結ターゲット(三菱マテリアル社製)を用い、純アルゴン中、0.2Paの圧力でスパッタ成膜した。
【0034】
[紫外線カット反射防止層構造]
1層目(反射防止層側) :ITO 、厚さ15nm
2層目 :SiO、厚さ20nm
3層目 :ITO 、厚さ125nm
4層目 :SiO、厚さ85nm
この反射防止フィルムについて、参考例1と同様にして光線透過率及び耐候劣化試験前後の黄色度と膜の密着度を調べ、結果を表1に示した。
【0035】
比較例1
市販のハードコートPETフィルム「ルミラーCOTO」の表面に、参考例1と同様にして反射防止層を形成し、得られた反射防止フィルムについて、参考例1と同様にして光線透過率及び耐候劣化試験前後の黄変度と膜の密着度を調べ、結果を表1に示した。
【0036】
【表1】

Figure 0004253862
【0037】
表1より、本発明の反射防止フィルムは、耐候性に優れ、黄変、膜剥離が防止されることがわかる。
【発明の効果】
【0038】
以上詳述した通り、本発明の反射防止フィルムによれば、膜剥離や黄変等の問題を引き起こすことなく、長期間使用可能な反射防止フィルムを提供することができる。
【図面の簡単な説明】
【図1】 図1(a),(b)は参考例の反射防止フィルムを示す模式的な断面図であり、図1(c)は本発明の反射防止フィルムの実施の形態を示す断面図である。
【図2】 従来例を示す断面図である。
【符号の説明】
1 ベースフィルム
2 ハードコート層
2A 紫外線カットハードコート層
3 反射防止層
3A 紫外線カット反射防止層
4,4A,4B,4C 反射防止フィルム
5 表面材
6 接着剤
7 紫外線カット層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antireflection film, and more particularly to an antireflection film excellent in weather resistance and durability and suitable as an antireflection film adhered to a surface material of a display board, a display, or an electric bulletin board.
[0002]
[Prior art]
In a surface material such as a display board, a display, or an electric bulletin board, visibility is deteriorated due to reflection of external light, illumination light, or bright surrounding scenery on the surface and an image. For this reason, in order to reduce such reflection, the surface material (including the outer cover material and the surface of the filter) is subjected to anti-glare treatment with fine unevenness or a thin film is coated. In some cases, antireflection treatment is performed to reduce reflection due to interference. When these antireflection treatments are directly applied to the surface material, the cost is increased. Therefore, a method of sticking a film subjected to the antireflection treatment to the surface material has been frequently adopted in recent years.
[0003]
Usually, as shown in FIG. 2, the conventional antireflection film has a hard coat layer 2 as a hard protective layer made of acrylic resin or siloxane on the base film 1 made of an organic film, and has a thickness of about 3 to 20 μm. The antireflection layer 3 such as antiglare and antireflection film is further formed thereon, and the antireflection film 4 is adhered to a surface material 5 such as a display with an adhesive 6. .
[0004]
[Problems to be solved by the invention]
Conventional antireflection films are easily affected by heat, humidity, and other environmental conditions during use, and peeling may occur at the interface between the base film 1 and the hard coat layer 2. In this case, as a matter of course, the antireflection layer 3 also falls off, so that it cannot function as an antireflection film.
[0005]
Further, even when the adhesion between the base film 1 and the hard coat layer 2 is good in the initial stage of use, particularly when the base film 1 is a PET film, the influence of the surrounding environment, particularly direct irradiation. The film deteriorates due to the influence of sunlight and other ultraviolet rays, the hard coat layer easily peels off due to external force, or the film turns yellow due to the deterioration due to ultraviolet rays, and cannot be applied as a cover film for the surface material of various display boards. .
[0006]
An object of the present invention is to solve the above-mentioned conventional problems, and to provide an antireflection film that is excellent in weather resistance and durability and can be used for a long time without causing problems such as film peeling and yellowing.
[0007]
[Means for Solving the Problems]
The antireflection film of the present invention, the surface of the organic film, the hard coat layer is provided, the anti-reflection film on which the antireflection layer is provided on the hard coat layer, the antireflection layer, the light in the vicinity of 400nm Is an ultraviolet cut layer having a high refractive index transparent thin film using a material having a high light absorption near 350 nm and below, and the light transmittance at 365 nm of the antireflection film is 40% or less. An antireflection film, wherein the antireflection layer is laminated in a total of four layers, one in the order of high refractive index transparent thin film / low refractive index transparent thin film / high refractive index transparent thin film / low refractive index transparent thin film. , and the the high-refractive-index transparent thin film is made of ITO or ZnO, the low refractive index transparent thin film is characterized by consisting of SiO 2.
[0008]
If it is an antireflection film having a light transmittance at 365 nm of 40% or less, it is excellent in weather resistance and durability without greatly affecting the surrounding environment such as ultraviolet rays, so the problem of yellowing and film peeling is prevented. The
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
1 (a) and 1 (b) are schematic cross-sectional views showing an antireflection film of a reference example, and FIG. 1 (c) is a schematic cross-sectional view showing an embodiment of the antireflection film of the present invention. is there.
[0011]
The antireflection film of the present invention has a light transmittance of 40% or less with respect to light having a wavelength of 365 nm of the film, but when this light transmittance exceeds 40%, there is a problem of deterioration due to ultraviolet rays or the like, Yellowing and film peeling occur.
[0012]
The light transmittance is preferably as low as possible. In the present invention, the light transmittance at 365 nm is preferably 30% or less, and the light transmittance for light having a wavelength of 350 nm is 20% or less, particularly 10% or less, especially 5% or less. It is desirable that
[0013]
Such an antireflection film of the present invention can be realized, for example, by adopting the following configuration (3).
[0014]
(1) An antireflection film 4A in which an ultraviolet cut layer 7 is interposed between a base film 1 and a hard coat layer 2 as shown in FIG.
(2) An antireflection film 4B in which the hard coat layer itself is an ultraviolet cut hard coat layer 2A as shown in FIG.
(3) An antireflection film 4C in which the antireflection layer itself is an ultraviolet cut antireflection layer 3B as shown in FIG.
[0015]
In the present invention, the organic film to be the base film 1 includes polyester, polyethylene terephthalate (PET), polybutylene terephthalate, polymethyl methacrylate (PMMA), acrylic, polycarbonate (PC), polystyrene, triacetate, polyvinyl alcohol, polychlorinated. Vinyl, polyvinylidene chloride, polyethylene, ethylene-vinyl acetate copolymer, polyurethane, cellophane, etc., preferably PET, PC, PMMA transparent films.
[0016]
Although the thickness of an organic film is suitably determined by the required characteristics (for example, intensity | strength, thin film property) by the use of the antireflection film obtained, it is usually set as the range of 1 micrometer-10 mm.
[0017]
As shown in FIG. 1 (a), when the ultraviolet cut layer 7 is formed, the ultraviolet cut layer 7 is made of an appropriate coating material such as an acrylic resin, a urethane resin, a silicone resin, or an epoxy resin with a known ultraviolet absorbing material. What is necessary is just to mix about 0.05 to 10 weight% and to coat on the base film 1. The thickness of the ultraviolet cut layer 7 thus formed is preferably about 0.5 to 20 μm.
[0018]
The hard coat layer 2 can be formed by coating a normal hard coat material such as an acrylic resin or a silicone resin. In the case where the hard coat layer itself has an ultraviolet cut property, the ultraviolet cut hard coat layer 2 </ b> A is formed by coating such a hard coat material with a known ultraviolet absorber of about 0.05 to 5 wt%. be able to. The thickness of the hard coat layer 2 or the ultraviolet cut hard coat layer 2A is preferably about 1 to 20 μm.
[0019]
As the antireflection layer 2, one having the following configuration can be used .
[0020]
High-refractive-index transparent thin film / low refractive index transparent thin film / high refractive index by a transparent thin film / low refractive index first layer in the order of the transparent thin film, also laminated to a total of four layers of
In here, as the high refractive Oriritsu transparent thin film, ITO (indium tin oxide) or ZnO, it is possible to adopt a refractive index of 1.8 or more of a thin film of Zn O doped with Al.
[0021]
As the low refractive Oriritsu transparent thin, the refractive index of SiO 2 to adopt 1.6 or less of the thin film.
[0022]
Thickness of high refractive index transparent thin Maku及 beauty low refractive index transparent thin film, so that it is possible by interference of light lowers the reflectance in the visible light range, appropriately determining film structure, the film type, the center wavelength or the like Is done.
[0023]
Such a transparent thin film can be formed by vapor deposition, sputtering, ion plating, CVD, micro gravure coating, direct gravure coating, slot die coating method and the like.
[0024]
In particular, in the present invention, in order to make the antireflection layer itself UV-cutting, as a material for the high refractive index transparent thin film, a material having a high light transmission property near 400 nm and a light absorption near 350 nm or less is used. Use. Such materials, ITO, Zn O and the like.
[0025]
In the antireflection film of the present invention, an antifouling layer such as a fluorine-based organic thin film may be further formed on the ultraviolet cut antireflection layer 3A. In this case, as the antifouling layer, FEP (fluoro And ethylene-propylene copolymer), PTFE (polytetrafluoroethylene), ETFE (ethylene-tetrafluoroethylene copolymer), PVF (polyvinyl fluoride), PVDF (polyvinylidene fluoride), and the like.
[0026]
Such an antireflection film of the present invention is extremely useful as an antireflection film adhered to the front surface of various display materials such as PDP of OA equipment and a front filter of a liquid crystal plate, and causes problems of yellowing and film peeling. Without showing a good antireflection function for a long time.
[0027]
【Example】
The present invention will be described more specifically with reference to the following reference examples, examples and comparative examples.
[0028]
Reference example 1
The surface of a commercially available PET film ("Lumirror # 188" manufactured by Toray Industries Inc., thickness 188 μm) is coated with a coating solution in which an acrylic resin and a UV absorber ("Titabine P" manufactured by Musashino Geigy) are mixed by 2.0% by weight. An ultraviolet cut layer having a thickness of 2 μm is formed, and a commercially available hard coat material (“Z7002” manufactured by JSR) is coated thereon to form a hard coat layer having a thickness of 6 μm. An antireflection film having a laminated structure was formed by reactive sputtering to produce an antireflection film.
[0029]
[Antireflection layer structure]
First layer (antireflection layer side): TiO 2 , thickness 13 nm
Second layer: SiO 2 , thickness 20 nm
Third layer: TiO 2 , thickness 110 nm
Fourth layer: SiO 2 , thickness 85 nm
The antireflection film was examined for light transmittance at 365 nm and 350 nm using a Hitachi self-propelled spectrophotometer, and the results are shown in Table 1.
[0030]
In addition, the antireflection film was subjected to a 30-hour weathering deterioration test with a super UV light resistance tester (manufactured by Eye Graphics), and the yellowness (YI value before and after this test: measured with a color computer manufactured by Suga Test Instruments Co., Ltd.) ) And film adhesion (measured by JIS K-5400 Gobang eye tape test (5 × 5)), and the results are shown in Table 1.
[0031]
Reference example 2
The surface of a commercially available PET film “Lumirror # 188” is coated with a commercially available hard coat material “Z7002” mixed with 0.5% by weight of an ultraviolet absorber “Titabine P”, and an ultraviolet cut hard coat having a thickness of 8 μm. An antireflection film was produced by forming an antireflection layer thereon in the same manner as in Example 1.
[0032]
The antireflection film was examined in the same manner as in Reference Example 1 for the light transmittance and the yellowness before and after the weather resistance test and the adhesion of the film. The results are shown in Table 1.
[0033]
Example 1
The antireflection film of the present invention was produced by forming an ultraviolet cut antireflection layer having the following four-layer structure on the surface of a commercially available hard coat PET film ("Lumirror COTO" manufactured by Toray Industries Inc., thickness 188 μm) by sputtering. The ITO film was formed by sputtering using a sintered target (manufactured by Mitsubishi Materials Corporation) at a pressure of 0.2 Pa in pure argon.
[0034]
[Ultraviolet cut antireflection layer structure]
First layer (antireflection layer side): ITO, thickness 15 nm
Second layer: SiO 2 , thickness 20 nm
3rd layer: ITO, thickness 125nm
Fourth layer: SiO 2 , thickness 85 nm
The antireflection film was examined in the same manner as in Reference Example 1 for the light transmittance and the yellowness before and after the weather resistance test and the adhesion of the film. The results are shown in Table 1.
[0035]
Comparative Example 1
An antireflection layer was formed on the surface of a commercially available hard coat PET film “Lumorator COTO” in the same manner as in Reference Example 1, and the resulting antireflection film was subjected to light transmittance and weather resistance deterioration test in the same manner as in Reference Example 1. The degree of yellowing before and after and the degree of film adhesion were examined, and the results are shown in Table 1.
[0036]
[Table 1]
Figure 0004253862
[0037]
From Table 1, it can be seen that the antireflection film of the present invention is excellent in weather resistance and prevents yellowing and film peeling.
【The invention's effect】
[0038]
As described above in detail, the antireflection film of the present invention can provide an antireflection film that can be used for a long period of time without causing problems such as film peeling and yellowing.
[Brief description of the drawings]
1 (a) and 1 (b) are schematic cross-sectional views showing an antireflection film of a reference example, and FIG. 1 (c) is a cross-sectional view showing an embodiment of the antireflection film of the present invention. It is.
FIG. 2 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base film 2 Hard coat layer 2A Ultraviolet cut hard coat layer 3 Antireflection layer 3A Ultraviolet cut antireflection layer 4, 4A, 4B, 4C Antireflection film 5 Surface material 6 Adhesive 7 Ultraviolet cut layer

Claims (1)

有機フィルムの表面に、ハードコート層が設けられ、該ハードコート層上に反射防止層が設けられている反射防止フィルムにおいて、該反射防止層は、400nm付近の光の通過性が高く、350nm付近及びそれ以下の光の吸収が多い材料を用いた高屈折率透明薄膜を有する紫外線カット層であり、該反射防止フィルムの365nmにおける光線透過率が40%以下である反射防止フィルムであって、
前記反射防止層が、高屈折率透明薄膜/低屈折率透明薄膜/高屈折率透明薄膜/低屈折率透明薄膜の順で1層ずつ、合計4層に積層したものであり、
前記高屈折率透明薄膜がITO又はZnOよりなり、
前記低屈折率透明薄膜がSiO よりなることを特徴とする反射防止フィルム。
In the antireflection film in which a hard coat layer is provided on the surface of the organic film, and the antireflection layer is provided on the hard coat layer, the antireflection layer has a high light transmission property around 400 nm and is around 350 nm. And an ultraviolet cut layer having a high-refractive-index transparent thin film using a material that absorbs less light, and the antireflection film has a light transmittance at 365 nm of 40% or less ,
The antireflective layer is laminated in a total of 4 layers, one layer in the order of high refractive index transparent thin film / low refractive index transparent thin film / high refractive index transparent thin film / low refractive index transparent thin film,
The high refractive index transparent thin film is made of ITO or ZnO,
Antireflection film wherein low refractive index transparent thin film is characterized by consisting of SiO 2.
JP11222198A 1998-04-22 1998-04-22 Antireflection film Expired - Fee Related JP4253862B2 (en)

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JP3751922B2 (en) * 2001-08-28 2006-03-08 大日本印刷株式会社 Antireflection film, and display device and liquid crystal display device using the same
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US20120075577A1 (en) 2006-03-20 2012-03-29 Ishak Andrew W High performance selective light wavelength filtering providing improved contrast sensitivity
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