JP3737075B2 - Optical member and antireflection film - Google Patents

Optical member and antireflection film Download PDF

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Publication number
JP3737075B2
JP3737075B2 JP2002240728A JP2002240728A JP3737075B2 JP 3737075 B2 JP3737075 B2 JP 3737075B2 JP 2002240728 A JP2002240728 A JP 2002240728A JP 2002240728 A JP2002240728 A JP 2002240728A JP 3737075 B2 JP3737075 B2 JP 3737075B2
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layer
film thickness
film
sio
optical member
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JP2004077989A (en
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寿 樋口
誠 足立
斉 嘉村
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Hoya Corp
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Hoya Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、光学部材及び反射防止膜に関し、特に、視感反射率が低く、視感透過率が高く、密着性、耐摩耗性、耐熱性、耐アルカリ性及び耐久性に優れた光学部材及び反射防止膜に関する。
【0002】
【従来の技術】
従来から、プラスチック基板に、反射防止膜を形成した光学部材は良く知られている。例えば、ヨ−ロッパ特許公開公報第1184685号明細書の実施例20には、二酸化ケイ素(SiO2)と酸化ニオブ(Nb2O5)を用い以下の構成からなる反射防止膜(第1〜7層)及びこの反射防止膜を有する光学部材が開示されている。
ヨ−ロッパ特許公開公報第1184685号明細書実施例20の構成
プラスチックレンズ基板:屈折率1.60
ハ−ドコ−ト層
第1層:SiO2 (膜厚:0.4156λ)
第2層:Nb2O5 (膜厚:0.0118λ)
第3層:SiO2 (膜厚:0.091λ)
第4層:Nb2O5 (膜厚:0.0932λ)
第5層:SiO2 (膜厚:0.1036λ)
第6層:Nb2O5 (膜厚:0.1362λ)
第7層:SiO2 (膜厚:0.2906λ)
かかる光学部材は、耐熱性、密着性、耐アルカリ性、耐擦傷性、密着性及び耐久性に優れている。ただし、この光学部材の反射防止膜の視感反射率は0.84%、視感透過率は99.01%であり、さらに低い視感反射率、高い視感透過率を有する光学部材が求められている。
【0003】
【発明が解決しようとする課題】
本発明はかかる課題を解決するためになされたものであり、その目的は、従来の光学部材及び反射防止膜の有する優れた特性を損なわずに、従来よりも低い視感反射率、高い視感透過率を有する光学部材及び反射防止膜を提供することにある。
【0004】
【課題を解決するための手段】
本発明者らは、前記の課題を解決すべく鋭意努力した結果、ヨ−ロッパ特許公開公報第1184685号明細書に開示されている層数と同じ7層構成とし、第1層、第2層、第3層及び第6層の膜厚を変えることで、その目的を達成した。従って、従来と比べて製造時間が長くなることはない。反射防止膜は、一般的に反射率が低ければ低いほど特性が良いとされているが、反射率を低くしようとして層数を増やすと製造時間が長くなり、生産効率の点で悪影響を及ぼす。本発明は、製造時間を長くすることの悪影響を除き、耐摩耗性、耐熱性、密着性などの物性を損なわずに、従来知られている部材の視感反射率をさらに低く、視感透過率を高くした点に特徴がある。
【0005】
すなわち、本発明は、プラスチック基板と、該プラスチック基板上に直接又は間接的に施された反射防止膜とを備えた光学部材であって、該反射防止膜が、前記プラスチック基板側から以下の順で積層されてなる光学部材、
第1層:SiO2 (膜厚:0.05〜0.20λ)
第2層:Nb2O5 (膜厚:0.02〜0.10λ)
第3層:SiO2 (膜厚:0.35〜0.70λ)
第4層:Nb2O5 (膜厚:0.04〜0.15λ)
第5層:SiO2 (膜厚:0.04〜0.15λ)
第6層:Nb2O5 (膜厚:0.20〜0.30λ)
第7層:SiO2 (膜厚:0.20〜0.30λ)
(λは、設計波長である。)
及びこの第1層から第7層が順次積層されてなる反射防止膜を提供するものである。
【0006】
【発明の実施の形態】
本発明の光学部材における反射防止膜の各層のλは設計波長を示す。設計波長は、特に限定されないが、眼鏡用レンズとして用いられる場合には、450nm〜650nmの間で好ましく設定される。
【0007】
この酸化ニオブ層(Nb2O5)を形成するには、100%の酸化ニオブを蒸着物質として使用してイオンアシスト法により形成する方法又は酸化ニオブ、酸化ジルコニウム及び酸化イットリウムの粉末、又は更に酸化アルミニウムを加えた粉末を焼結し、得られた焼結体から混合酸化物の蒸気を発生させ、発生した蒸発物を基板上に析出させる方法で行うことが好ましい。
また、蒸発物を基板上に析出させる方法では、焼結体の混合割合は、良好な膜物性を得るために、蒸着組成物全量を基準にして、酸化ニオブが60〜90重量%、酸化ジルコニウムが5〜20重量%、酸化イットリウムが5〜35重量%であることが好ましい。さらに、酸化アルミニウムを加える場合には、酸化ニオブ、酸化ジルコニウム及び酸化イットリウム合計に対して0.3〜7.5重量%を添加することが好ましい。
【0008】
酸化ニオブ層の好ましい屈折率は2.15〜2.35で、二酸化ケイ素層の好ましい屈折率は1.43〜1.47である。
本発明の光学部材は、プラスチック基板と反射防止膜との間に下地層が設けられていると好ましく、下地層の材質としては、二酸化ケイ素層または金属ニオブが好ましく、金属ニオブが特に好ましい。また、膜厚としては、二酸化ケイ素層の場合は、膜強度等の点から0.1λ〜5λで、金属ニオブの場合は、膜の透明性確保等の点から0.005 λ〜0.015λが好ましい。
【0009】
下地層の材質を金属ニオブとすると、プラスチック基板と反射防止膜の密着性、耐熱性、耐衝撃性及び耐摩耗性に優れ、金属特有の吸収率が少ない等の利点を有している。この金属ニオブ(Nb層)の形成は、イオンアシスト法で行なうことが好ましい。
前記イオンアシスト法を実施する際のイオン化ガスは、成膜中の酸化防止の点からアルゴン(Ar)を用いるのが好ましい。これにより膜質の安定と、光学式膜厚計での制御が可能となる。
さらに、プラスチック基板と下地層との密着性確保及び蒸着物質の初期膜形成状態の均一化を図るために、下地層を形成する前にイオン銃前処理を行なってもよい。イオン銃前処理におけるイオン化ガスは 酸素、アルゴンなどを用いることができ、出力で好ましい範囲は、加速電圧が50V〜200V、加速電流が50mA〜150mAである。
【0010】
本発明の光学部材において、反射防止膜の形成方法は、通常の真空蒸着法、イオンアシスト法等を用いることができる。
本発明の光学部材に用いるプラスチック基板としては、特に限定されず、例えば、メチルメタクリレート単独重合体、メチルメタクリレートと1種以上の他のモノマーとの共重合体、ジエチレングリコールビスアリルカーボネート単独重合体、ジエチレングリコールビスアリルカーボネートと1種以上の他のモノマーとの共重合体、イオウ含有共重合体、ハロゲン含有共重合体、ポリカーボネート、ポリスチレン、ポリ塩化ビニル、不飽和ポリエステル、ポリエチレンテレフタレート、ポリウレタン等が挙げられる。
プラスチック基板の屈折率は、1.58〜1.62であることが好ましい。
【0011】
本発明の光学部材は、前記プラスチック基板と反射防止膜あるいは前記下地層との間に、硬化被膜を有してもよい。
硬化被膜としては、通常、金属酸化物コロイド粒子と有機ケイ素化合物よりなるコ−ティング組成物を硬化したものが一般的に用いられる。
前記金属酸化物コロイド粒子としては、例えば、酸化タングステン(WO3)、酸化亜鉛(ZnO)、酸化ケイ素(SiO2)、酸化アルミニウム(Al23)、酸化チタニウム(TiO2)、酸化ジルコニウム(ZrO2)、酸化スズ(SnO2)、酸化ベリリウム(BeO)又は酸化アンチモン(Sb25)等が挙げられ、単独又は2種以上を併用することができる。
【0012】
【実施例】
以下、実施例により本発明をさらに詳細に説明するが、本発明はこれらの実施例に限定されるものではない。
なお、実施例1及び比較例1における光学部材(プラスチックレンズ)は、以下に示す試験方法により、諸物性を測定した。
(1)視感透過率
プラスチックレンズの視感透過率Yは、両面に反射防止膜を有するプラスチックレンズをサンプルとして、日立分光光度計U−3410を用い測定した。
(2)視感反射率
プラスチックレンズの視感反射率Zは、両面に反射防止膜を有するプラスチックレンズをサンプルとして、日立分光光度計U−3410を用い測定した。
(3)密着性
プラスチックレンズの表面に剃刀にて1mm×1mmの升目を100個作成し、升目上にセロハンテープを貼り、一気にテープをはがし、残った升目の数で評価した。表中、残った升目の数/100で記載した。
(4)耐摩耗性
プラスチックレンズの表面にスチールウール(日本スチ−ルウ−ル(株)製、規格#0000)にて1kgf/cm2 の荷重をかけ、20ストローク擦り、表面状態により以下の基準で評価した。
UA:殆ど傷なし
A:細い傷数本あり
B:細い傷多数、太い傷数本あり
C:細い傷多数、太い傷多数あり
D:殆ど膜はげ状態
【0013】
(5)耐熱性
プラスチックレンズをドライオーブンで1時間加熱し、クラックの発生温度を測定した。加熱温度は、50℃より始め、5℃ずつ上げて、クラックを発生する温度を調べた。
(6)耐アルカリ性
プラスチックレンズをNaOH水溶液10%に1時間浸漬し、表面状態により以下の基準で評価した。
UA:殆ど変化なし
A:点状の膜はげ数個あり
B:点状の膜はげが全面にあり
C:点状のはげが全面、面状のはげ数個あり
D:殆ど全面膜はげ
(7)耐久性
温度40℃、湿度90%の条件下に、プラスチックレンズを1週間及び1ヶ月置いた後、前述した密着性、耐熱性及び耐アルカリ性テストを行った。
【0014】
実施例1
基板及びハ−ドコ−ト層の作製
ガラス製容器に、有機ケイ素化合物のγ−グリシドキシプロピルメトキシシラン142重量部を加え、撹拌しながら、0.01N塩酸1.4重量部、水32重量部を滴下した。滴下終了後、24時間撹拌を行いγ−グリシドキシプロピルトリメトキシシランの加水分解溶液を得た。この溶液に、酸化第二スズ−酸化ジルコニウム複合体ゾル(メタノール分散、全金属酸化物31.5重量%、平均粒子径10〜15ミリミクロン)460重量部、エチルセロソルブ300重量部、さらに滑剤としてシリコーン系界面活性剤0.7重量部、硬化剤としてアルミニウムアセチルアセトネート8重量部を加え、充分に撹拌した後、濾過を行ってコーティング液を得た。
さらに、アルカリ水溶液で前処理したプラスチックレンズ基板〔HOYA(株)製、眼鏡用プラスチックレンズ(商品名:EYAS)、屈折率1.60以下、〕を、前記コーティング液の中に浸漬させ、浸漬終了後、引き上げ速度20cm/分で引き上げたプラスチックレンズを120℃で2時間加熱してハ−ドコ−ト層を形成した。
【0015】
反射防止膜の作製
前記ハ−ドコ−ト層の表面上に、下記成分及び膜厚で、第1層から順に7層から構成される反射防止膜を形成し目的とするプラスチックレンズを作製した。
第1層:SiO2 (膜厚:0.1483λ)
第2層:Nb2O5 (膜厚:0.0386λ)
第3層:SiO2 (膜厚:0.6585λ)
第4層:Nb2O5 (膜厚:0.112λ)
第5層:SiO2 (膜厚:0.0767λ)
第6層:Nb2O5 (膜厚:0.221λ)
第7層:SiO2 (膜厚:0.2756λ)
λは照射光の波長で、500nmを示す.
なお、Nb2O5層は、Nb2O5粉末、ZrO2粉末、Y23粉末を混合し、300kg/cm2 でプレス加圧し、焼結温度1300℃で焼結して得られた3成分系蒸着組成物A(重量%、Nb2O5:ZrO2:Y23=76%〜90%:16.6%〜5%:7.4%〜5%)を用いて作製した。
得られたプラスチックレンズについて上記(1)〜(7)を評価し、それらの結果を表1に示した。
【0016】
比較例1
実施例1において、反射防止膜の膜構成をヨ−ロッパ特許公開公報第1184685号明細書の実施例14に記載されている以下のようにした以外は、同様にしてプラスチックレンズを作製した。
第1層:SiO2 (膜厚:0.4156λ)
第2層:Nb2O5 (膜厚:0.0118λ)
第3層:SiO2 (膜厚:0.091λ)
第4層:Nb2O5 (膜厚:0.0932λ)
第5層:SiO2 (膜厚:0.1036λ)
第6層:Nb2O5 (膜厚:0.1362λ)
第7層:SiO2 (膜厚:0.2906λ)
なお、Nb2O5層は、実施例1同様、Nb2O5粉末、ZrO2粉末、Y23粉末を混合し、300kg/cm2 でプレス加圧し、焼結温度1300℃で焼結して得られた3成分系蒸着組成物A(重量%、Nb2O5:ZrO2:Y23=76%〜90%:16.6%〜5%:7.4%〜5%)を用いて作製した。
得られたプラスチックレンズについて上記(1)〜(7)を評価し、それらの結果を表1に示した。
【0017】
【表1】

Figure 0003737075
表1に記載したように、密着性、耐摩耗性、耐熱性、耐アルカリ性及び耐久性は実施例1と比較例1は同程度であったが、視感透過率は、実施例1の方が大幅に高く、視感反射率は、実施例1の方が大幅に低いことから、実施例1の反射防止膜及びプラスチックレンズは、比較例1に比べ優れたものであった。
【0018】
【発明の効果】
以上、詳細に説明したように、本発明の光学部材及び反射防止膜は、密着性、耐摩耗性、耐熱性、耐アルカリ性及び耐久性が従来の反射防止膜と同程度でありながら、層数を増やすことなく、従来より視感透過率が高く、視感反射率が低く優れたものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical member and an antireflection film, and in particular, an optical member having a low luminous reflectance, a high luminous transmittance, and excellent adhesion, abrasion resistance, heat resistance, alkali resistance, and durability. It relates to a prevention film.
[0002]
[Prior art]
Conventionally, an optical member in which an antireflection film is formed on a plastic substrate is well known. For example, in Example 20 of the specification of European Patent Publication No. 1184855, an antireflection film (first to seventh) using silicon dioxide (SiO 2 ) and niobium oxide (Nb 2 O 5 ) and having the following configuration is used. Layer) and an optical member having this antireflection film.
Composition of Example 20 of European Patent Publication No. 1184855 Plastic lens substrate: Refractive index 1.60
Hard coat layer first layer: SiO 2 (film thickness: 0.4156λ)
Second layer: Nb 2 O 5 (film thickness: 0.0118λ)
Third layer: SiO 2 (film thickness: 0.091λ)
Fourth layer: Nb 2 O 5 (film thickness: 0.0932λ)
Fifth layer: SiO 2 (film thickness: 0.1036λ)
Sixth layer: Nb 2 O 5 (film thickness: 0.1362λ)
Seventh layer: SiO 2 (film thickness: 0.2906λ)
Such an optical member is excellent in heat resistance, adhesion, alkali resistance, scratch resistance, adhesion and durability. However, the optical reflectance of the antireflection film of this optical member is 0.84% and the luminous transmittance is 99.01%, and an optical member having a lower luminous reflectance and a higher luminous transmittance is desired.
[0003]
[Problems to be solved by the invention]
The present invention has been made in order to solve such problems, and its purpose is to achieve a lower luminous reflectance and higher luminous sensitivity than before without losing the excellent characteristics of conventional optical members and antireflection films. An object is to provide an optical member and an antireflection film having transmittance.
[0004]
[Means for Solving the Problems]
As a result of diligent efforts to solve the above-mentioned problems, the inventors of the present invention have the same seven-layer structure as the number of layers disclosed in the specification of European Patent Publication No. 1184685, and the first and second layers. The object was achieved by changing the film thickness of the third layer and the sixth layer. Therefore, the manufacturing time does not become longer than in the prior art. In general, it is said that the lower the reflectance, the better the characteristics of the antireflection film. However, if the number of layers is increased in order to reduce the reflectance, the manufacturing time becomes longer, which adversely affects the production efficiency. The present invention eliminates the adverse effects of prolonging the production time, and further reduces the luminous reflectance of conventionally known members without impairing the physical properties such as wear resistance, heat resistance, and adhesion, and transmits the luminous sensitivity. It is characterized by a high rate.
[0005]
That is, the present invention provides an optical member comprising a plastic substrate and an antireflection film applied directly or indirectly on the plastic substrate, the antireflection film being arranged in the following order from the plastic substrate side. An optical member laminated with
First layer: SiO 2 (film thickness: 0.05 to 0.20λ)
Second layer: Nb 2 O 5 (film thickness: 0.02 to 0.10λ)
Third layer: SiO 2 (film thickness: 0.35 to 0.70λ)
Fourth layer: Nb 2 O 5 (film thickness: 0.04 to 0.15λ)
Fifth layer: SiO 2 (film thickness: 0.04 to 0.15λ)
Sixth layer: Nb 2 O 5 (film thickness: 0.20 to 0.30λ)
Seventh layer: SiO 2 (film thickness: 0.20 to 0.30λ)
(Λ is the design wavelength.)
And an antireflection film in which the first to seventh layers are sequentially laminated.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Λ of each layer of the antireflection film in the optical member of the present invention indicates a design wavelength. The design wavelength is not particularly limited, but is preferably set between 450 nm and 650 nm when used as a spectacle lens.
[0007]
In order to form this niobium oxide layer (Nb 2 O 5 ), a method in which 100% niobium oxide is used as a deposition material by an ion assist method, or a powder of niobium oxide, zirconium oxide and yttrium oxide, or further oxidation. It is preferable to sinter the powder to which aluminum has been added, generate a vapor of mixed oxide from the obtained sintered body, and deposit the generated vapor on the substrate.
Further, in the method of depositing the evaporated material on the substrate, the mixing ratio of the sintered body is 60 to 90% by weight of niobium oxide and zirconium oxide based on the total amount of the vapor deposition composition in order to obtain good film properties. Is preferably 5 to 20% by weight, and yttrium oxide is preferably 5 to 35% by weight. Furthermore, when adding aluminum oxide, it is preferable to add 0.3 to 7.5 weight% with respect to the total of niobium oxide, a zirconium oxide, and a yttrium oxide.
[0008]
The preferred refractive index of the niobium oxide layer is 2.15 to 2.35, and the preferred refractive index of the silicon dioxide layer is 1.43 to 1.47.
In the optical member of the present invention, a base layer is preferably provided between the plastic substrate and the antireflection film, and the material of the base layer is preferably a silicon dioxide layer or metal niobium, and particularly preferably metal niobium. The film thickness is preferably 0.1λ to 5λ in the case of a silicon dioxide layer from the viewpoint of film strength and the like, and 0.005 λ to 0.015λ in the case of metallic niobium from the viewpoint of ensuring the transparency of the film.
[0009]
When the material of the underlayer is metallic niobium, it has advantages such as excellent adhesion between the plastic substrate and the antireflection film, heat resistance, impact resistance and wear resistance, and a low absorption rate peculiar to metal. The formation of the metal niobium (Nb layer) is preferably performed by an ion assist method.
Argon (Ar) is preferably used as the ionization gas for carrying out the ion assist method from the viewpoint of preventing oxidation during film formation. This makes it possible to stabilize the film quality and control it with an optical film thickness meter.
Furthermore, in order to ensure adhesion between the plastic substrate and the underlayer and to make the initial film formation state of the vapor deposition material uniform, an ion gun pretreatment may be performed before forming the underlayer. Oxygen, argon, or the like can be used as the ionized gas in the ion gun pretreatment, and preferable ranges of output are an acceleration voltage of 50 V to 200 V and an acceleration current of 50 mA to 150 mA.
[0010]
In the optical member of the present invention, the method for forming the antireflection film may be a normal vacuum deposition method, an ion assist method, or the like.
The plastic substrate used for the optical member of the present invention is not particularly limited. For example, methyl methacrylate homopolymer, copolymer of methyl methacrylate and one or more other monomers, diethylene glycol bisallyl carbonate homopolymer, diethylene glycol Examples include copolymers of bisallyl carbonate and one or more other monomers, sulfur-containing copolymers, halogen-containing copolymers, polycarbonate, polystyrene, polyvinyl chloride, unsaturated polyesters, polyethylene terephthalate, and polyurethane.
The refractive index of the plastic substrate is preferably 1.58 to 1.62.
[0011]
The optical member of the present invention may have a cured coating between the plastic substrate and the antireflection film or the base layer.
As the cured film, generally a cured film obtained by curing a coating composition comprising metal oxide colloidal particles and an organosilicon compound is generally used.
Examples of the metal oxide colloidal particles include tungsten oxide (WO 3 ), zinc oxide (ZnO), silicon oxide (SiO 2 ), aluminum oxide (Al 2 O 3 ), titanium oxide (TiO 2 ), zirconium oxide ( ZrO 2 ), tin oxide (SnO 2 ), beryllium oxide (BeO), or antimony oxide (Sb 2 O 5 ), and the like can be used alone or in combination of two or more.
[0012]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples.
The optical members (plastic lenses) in Example 1 and Comparative Example 1 were measured for various physical properties by the following test methods.
(1) Luminous transmittance The luminous transmittance Y of a plastic lens was measured using a Hitachi spectrophotometer U-3410 using a plastic lens having antireflection films on both sides as a sample.
(2) Luminous reflectance Z Luminous reflectance Z of a plastic lens was measured using a Hitachi spectrophotometer U-3410 using a plastic lens having an antireflection film on both sides as a sample.
(3) Adhesive Plastic lens The surface of the plastic lens was made with 100 razors and 100 squares of 1 mm × 1 mm were formed, cellophane tape was applied on the squares, the tape was peeled off at once, and the number of squares remaining was evaluated. In the table, it is indicated by the number of remaining squares / 100.
(4) A load of 1 kgf / cm 2 was applied to the surface of the abrasion-resistant plastic lens with steel wool (Nippon Steel Wool Co., Ltd., Standard # 0000), rubbed for 20 strokes, and the following criteria depending on the surface condition: It was evaluated with.
UA: Almost no scratch A: Some thin wounds B: Many thin wounds, some thick wounds C: Many thin wounds, many thick scratches D: Almost film bald state
(5) The heat-resistant plastic lens was heated in a dry oven for 1 hour, and the crack generation temperature was measured. The heating temperature was started at 50 ° C. and increased by 5 ° C., and the temperature at which cracks occurred was examined.
(6) The alkali-resistant plastic lens was immersed in 10% NaOH aqueous solution for 1 hour, and evaluated according to the following criteria depending on the surface condition.
UA: Almost no change A: There are several point-like film baldnesses B: There are dot-like film baldnesses on the entire surface C: There are dot-like baldnesses on the whole surface, and several surface-shaped baldnesses D: Almost whole film baldness (7 ) After the plastic lens was placed for 1 week and 1 month under the conditions of a durability temperature of 40 ° C. and a humidity of 90%, the above-mentioned adhesion, heat resistance and alkali resistance tests were performed.
[0014]
Example 1
Preparation of substrate and hard coat layer 142 parts by weight of γ-glycidoxypropylmethoxysilane, an organosilicon compound, is added to a glass container and stirred with 1.4 parts by weight of 0.01N hydrochloric acid. Then, 32 parts by weight of water was added dropwise. After completion of dropping, the mixture was stirred for 24 hours to obtain a hydrolyzed solution of γ-glycidoxypropyltrimethoxysilane. To this solution, 460 parts by weight of stannic oxide-zirconium oxide composite sol (methanol dispersion, 31.5% by weight of all metal oxides, average particle size of 10 to 15 millimicrons), 300 parts by weight of ethyl cellosolve, and as a lubricant 0.7 parts by weight of a silicone-based surfactant and 8 parts by weight of aluminum acetylacetonate as a curing agent were added and stirred sufficiently, followed by filtration to obtain a coating solution.
Further, a plastic lens substrate [made by HOYA, plastic lens for eyeglasses (trade name: EYAS), refractive index of 1.60 or less] pretreated with an alkaline aqueous solution is immersed in the coating solution, and the immersion is completed. Thereafter, the plastic lens pulled up at a pulling rate of 20 cm / min was heated at 120 ° C. for 2 hours to form a hard coat layer.
[0015]
Production of antireflection film An antireflection film composed of seven layers in order from the first layer having the following components and film thickness is formed on the surface of the hard coat layer, and the objective plastic lens is formed. Was made.
First layer: SiO 2 (film thickness: 0.1483λ)
Second layer: Nb 2 O 5 (film thickness: 0.0386λ)
Third layer: SiO 2 (film thickness: 0.6585λ)
Fourth layer: Nb 2 O 5 (film thickness: 0.112λ)
Fifth layer: SiO 2 (film thickness: 0.0767λ)
Sixth layer: Nb 2 O 5 (film thickness: 0.221λ)
Seventh layer: SiO 2 (film thickness: 0.2756λ)
λ is the wavelength of the irradiated light and indicates 500 nm.
The Nb 2 O 5 layer was obtained by mixing Nb 2 O 5 powder, ZrO 2 powder, Y 2 O 3 powder, press-pressing at 300 kg / cm 2 , and sintering at a sintering temperature of 1300 ° C. Prepared using ternary vapor deposition composition A (wt%, Nb 2 O 5 : ZrO 2 : Y 2 O 3 = 76% -90%: 16.6% -5%: 7.4% -5%) did.
The obtained plastic lenses were evaluated for the above (1) to (7), and the results are shown in Table 1.
[0016]
Comparative Example 1
A plastic lens was produced in the same manner as in Example 1 except that the antireflection film was configured as follows in Example 14 of European Patent Publication No. 1184855.
First layer: SiO 2 (film thickness: 0.4156λ)
Second layer: Nb 2 O 5 (film thickness: 0.0118λ)
Third layer: SiO 2 (film thickness: 0.091λ)
Fourth layer: Nb 2 O 5 (film thickness: 0.0932λ)
Fifth layer: SiO 2 (film thickness: 0.1036λ)
Sixth layer: Nb 2 O 5 (film thickness: 0.1362λ)
Seventh layer: SiO 2 (film thickness: 0.2906λ)
The Nb 2 O 5 layer was mixed with Nb 2 O 5 powder, ZrO 2 powder, and Y 2 O 3 powder, press-pressed at 300 kg / cm 2 , and sintered at a sintering temperature of 1300 ° C. as in Example 1. Ternary deposition composition A obtained by weight (% by weight, Nb 2 O 5 : ZrO 2 : Y 2 O 3 = 76% to 90%: 16.6% to 5%: 7.4% to 5% ).
The obtained plastic lenses were evaluated for the above (1) to (7), and the results are shown in Table 1.
[0017]
[Table 1]
Figure 0003737075
As shown in Table 1, the adhesiveness, wear resistance, heat resistance, alkali resistance and durability were the same in Example 1 and Comparative Example 1, but the luminous transmittance was the same as in Example 1. Since the reflective reflectance of Example 1 was significantly lower in Example 1, the antireflection film and plastic lens of Example 1 were superior to those of Comparative Example 1.
[0018]
【The invention's effect】
As described above in detail, the optical member and the antireflection film of the present invention have the same number of layers as the adhesion, wear resistance, heat resistance, alkali resistance and durability of the conventional antireflection film. Without increasing the luminous efficiency, the luminous transmittance is higher than before, and the luminous reflectance is low and excellent.

Claims (7)

プラスチック基板と、該プラスチック基板上に直接又は間接的に施された反射防止膜とを備えた光学部材であって、該反射防止膜が、前記プラスチック基板側から以下の順で積層されてなる光学部材。
第1層:SiO2 (膜厚:0.05〜0.20λ)
第2層:Nb2O5 (膜厚:0.02〜0.10λ)
第3層:SiO2 (膜厚:0.35〜0.70λ)
第4層:Nb2O5 (膜厚:0.04〜0.15λ)
第5層:SiO2 (膜厚:0.04〜0.15λ)
第6層:Nb2O5 (膜厚:0.20〜0.30λ)
第7層:SiO2 (膜厚:0.20〜0.30λ)
(λは、設計波長である。)
An optical member comprising a plastic substrate and an antireflection film applied directly or indirectly on the plastic substrate, wherein the antireflection film is laminated in the following order from the plastic substrate side Element.
First layer: SiO 2 (film thickness: 0.05 to 0.20λ)
Second layer: Nb 2 O 5 (film thickness: 0.02 to 0.10λ)
Third layer: SiO 2 (film thickness: 0.35 to 0.70λ)
Fourth layer: Nb 2 O 5 (film thickness: 0.04 to 0.15λ)
Fifth layer: SiO 2 (film thickness: 0.04 to 0.15λ)
Sixth layer: Nb 2 O 5 (film thickness: 0.20 to 0.30λ)
Seventh layer: SiO 2 (film thickness: 0.20 to 0.30λ)
(Λ is the design wavelength.)
前記プラスチック基板と、前記反射防止膜との間に硬化被膜を有する請求項1記載の光学部材。The optical member according to claim 1, further comprising a cured film between the plastic substrate and the antireflection film. 前記プラスチック基板の屈折率が、1.58〜1.62である請求項1又は2記載の光学部材。The optical member according to claim 1 or 2, wherein the plastic substrate has a refractive index of 1.58 to 1.62. 前記λが450nm〜650nmである請求項1〜3のいずれかに記載の光学部材。The optical member according to claim 1, wherein λ is 450 nm to 650 nm. 眼鏡用プラスチックレンズである請求項1〜4のいずれかに記載の光学部材。The optical member according to claim 1, which is a plastic lens for spectacles. 下記の第1層から第7層が順次積層されてなる反射防止膜。
第1層:SiO2 (膜厚:0.05〜0.20λ)
第2層:Nb2O5 (膜厚:0.02〜0.10λ)
第3層:SiO2 (膜厚:0.35〜0.70λ)
第4層:Nb2O5 (膜厚:0.04〜0.15λ)
第5層:SiO2 (膜厚:0.04〜0.15λ)
第6層:Nb2O5 (膜厚:0.19〜0.30λ)
第7層:SiO2 (膜厚:0.20〜0.30λ)
(λは、設計波長である。)
An antireflection film in which the following first to seventh layers are sequentially laminated.
First layer: SiO 2 (film thickness: 0.05 to 0.20λ)
Second layer: Nb 2 O 5 (film thickness: 0.02 to 0.10λ)
Third layer: SiO 2 (film thickness: 0.35 to 0.70λ)
Fourth layer: Nb 2 O 5 (film thickness: 0.04 to 0.15λ)
Fifth layer: SiO 2 (film thickness: 0.04 to 0.15λ)
Sixth layer: Nb 2 O 5 (film thickness: 0.19 to 0.30λ)
Seventh layer: SiO 2 (film thickness: 0.20 to 0.30λ)
(Λ is the design wavelength.)
前記λが450nm〜650nmである請求項6記載の反射防止膜。The antireflection film according to claim 6, wherein the λ is 450 nm to 650 nm.
JP2002240728A 2002-08-21 2002-08-21 Optical member and antireflection film Expired - Fee Related JP3737075B2 (en)

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