JP3649407B2 - Porous optical material for antireflection - Google Patents

Porous optical material for antireflection Download PDF

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JP3649407B2
JP3649407B2 JP2004031037A JP2004031037A JP3649407B2 JP 3649407 B2 JP3649407 B2 JP 3649407B2 JP 2004031037 A JP2004031037 A JP 2004031037A JP 2004031037 A JP2004031037 A JP 2004031037A JP 3649407 B2 JP3649407 B2 JP 3649407B2
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refractive index
antireflection
optical material
porous optical
porous
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JP2004171023A (en
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恵 石原
俊夫 吉原
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Description

本発明は、反射防止用多孔質光学材料に関し、特に、透明材料の屈折率を低下させてなる反射防止用多孔質光学材料に関する。   The present invention relates to an antireflection porous optical material, and more particularly to an antireflection porous optical material in which the refractive index of a transparent material is lowered.

屈折率の低い光学材料の適用分野には、反射防止膜、光導波路、レンズ、プリズム等があり、ディスプレイ表面からの反射を抑える防眩処理、光導波路のクラッド等に用いられる。   Fields of application of optical materials having a low refractive index include antireflection films, optical waveguides, lenses, prisms, and the like, which are used for antiglare treatment for suppressing reflection from the display surface, cladding for optical waveguides, and the like.

ところで、従来、屈折率の低い材料としては、サイトップ（旭化成（株）製）等のフッ素化合物（屈折率：１．３４）やフッ化マグネシウム（屈折率：１．３８）等の化合物、及び、それらの超微粒子を樹脂等に分散させて形成したもの等がある。   By the way, conventionally, as a low refractive index material, compounds such as fluorine compounds (refractive index: 1.34) and magnesium fluoride (refractive index: 1.38) such as CYTOP (manufactured by Asahi Kasei Co., Ltd.), and And those formed by dispersing these ultrafine particles in a resin or the like.

しかしながら、フッ素化合物、フッ化マグネシウム等の屈折率は高々１．３程度であり、これより低いものを得ることはできなかった。   However, the refractive indexes of fluorine compounds, magnesium fluoride, and the like are about 1.3 at most, and it was not possible to obtain a refractive index lower than this.

また、超微粒子分散系材料では、その屈折率は、マトリクス材料の屈折率と超微粒子の屈折率との中間の値しかとることができず、フッ化マグネシウムの超微粒子を用いても、１．３８以下の値をとることはできない。   In addition, in the ultrafine particle dispersed material, the refractive index can take only an intermediate value between the refractive index of the matrix material and the refractive index of the ultrafine particle. A value of 38 or less cannot be taken.

ところで、反射防止処理については、屈折率の高い材料と低い材料を交互に積層する多層膜による方法と、屈折率の高いガラスあるいはプラスチック等の表面に屈折率の低い材料の単層を設ける方法等がある。後者の場合、屈折率をガラスあるいはプラスチック表面から徐々に低くし、空気の屈折率（＝１）に近づけるほどその効果は大きい。そのためには、従来にない低い屈折率を持つ材料が必要である。   By the way, for the antireflection treatment, a method using a multilayer film in which a material having a high refractive index and a material having a low refractive index are alternately laminated, a method of providing a single layer of a material having a low refractive index on the surface of glass or plastic having a high refractive index, etc. There is. In the latter case, the effect is greater as the refractive index is gradually lowered from the glass or plastic surface and closer to the refractive index of air (= 1). For this purpose, a material having an unprecedented low refractive index is required.

本発明はこのような状況に鑑みてなされたものであり、その目的は、従来にない低屈折率を可能にする反射防止用光学材料を提供することである。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide an antireflection optical material that enables an unprecedented low refractive index.

上記目的を達成する本発明の反射防止用多孔質光学材料は、透明材料中にガスを含むマイクロカプセル（マイクロバルーン）を分散させてその透明材料自身の屈折率より低い屈折率にしたことを特徴とするものである。   The porous optical material for antireflection of the present invention that achieves the above object is characterized in that microcapsules (microballoons) containing a gas are dispersed in a transparent material to have a refractive index lower than the refractive index of the transparent material itself. It is what.

以上の説明から明らかなように、本発明の反射防止用多孔質光学材料によると、透明材料中にガスを含むマイクロカプセル（マイクロバルーン）を分散させてその透明材料自身の屈折率より低い屈折率にすることができるので、反射防止処理において、処理表面層の屈折率を従来に比べてより空気の屈折率に近づけることができるため、大きな反射防止効果が得られる。   As is clear from the above description, according to the antireflection porous optical material of the present invention, the microcapsules (microballoons) containing gas are dispersed in the transparent material, and the refractive index is lower than the refractive index of the transparent material itself. Therefore, in the antireflection treatment, the refractive index of the treated surface layer can be made closer to the refractive index of air as compared with the conventional case, so that a large antireflection effect can be obtained.

本発明の上記目的を達成すべく研究の結果、マトリクス材料中に上記超微粒子の代わりに、真空、空気あるいは窒素等のガスからなる微小な空孔を分散させることにより、マトリクス材料より低い屈折率の光学材料が得られることを見出して本発明を完成したものである。この場合、この多孔質体の空孔は、それぞれが独立した泡状の空孔である。   As a result of research to achieve the above object of the present invention, a refractive index lower than that of the matrix material is obtained by dispersing minute holes made of a gas such as vacuum, air or nitrogen instead of the ultrafine particles in the matrix material. The present invention has been completed by finding that an optical material can be obtained. In this case, the pores of the porous body are independent bubble-like pores.

このような多孔質光学材料を作製する方法としては、以下に例を示す。   Examples of methods for producing such a porous optical material are shown below.

空気等のガスを含むマイクロカプセル（マイクロバルーン）をマトリクスとなる樹脂のワニスに分散させ、乾燥して多孔質体を作る。マトリクス樹脂としては、アクリル樹脂、ポリエステル樹脂、ウレタン樹脂、ポリカーボネート樹脂等、及び、それらの混合物、共重合体等がある。   A microcapsule (microballoon) containing a gas such as air is dispersed in a resin varnish serving as a matrix and dried to make a porous body. Examples of the matrix resin include an acrylic resin, a polyester resin, a urethane resin, a polycarbonate resin, etc., and a mixture or copolymer thereof.

このようにして得られる多孔質体は、反射防止膜等の光学薄膜材料として用いることもできる。その場合に、グラジエントな屈折率分布を持たせることもできる。屈折率分布を持たせるには、微小空孔の密度を変化させればよい。   The porous body thus obtained can also be used as an optical thin film material such as an antireflection film. In that case, a gradient refractive index distribution can be provided. In order to have a refractive index distribution, the density of minute holes may be changed.

すなわち、本発明の反射防止用多孔質光学材料は、透明材料中にガスを含むマイクロカプセル（マイクロバルーン）を分散させてその透明材料自身の屈折率より低い屈折率にしたことを特徴とするものである。   That is, the antireflection porous optical material of the present invention is characterized in that a microcapsule (microballoon) containing a gas is dispersed in a transparent material so that the refractive index is lower than the refractive index of the transparent material itself. It is.

この場合、微小空孔の大きさは１０Åから使用波長程度であることが望ましい。透明材料としては、高分子材料を用いることができる。そして、本発明の反射防止用多孔質光学材料には屈折率に分布を持たせることもできる。なお、本発明の多孔質光学材料は、光学薄膜材料として用いることもできる。   In this case, it is desirable that the size of the minute holes is about 10 to about the wavelength used. A polymer material can be used as the transparent material. The antireflective porous optical material of the present invention can have a distribution in refractive index. The porous optical material of the present invention can also be used as an optical thin film material.

Claims (5)

透明材料中にガスを含むマイクロカプセル（マイクロバルーン）を分散させてその透明材料自身の屈折率より低い屈折率にしたことを特徴とする反射防止用多孔質光学材料。 A porous optical material for antireflection, characterized in that microcapsules (microballoons) containing gas are dispersed in a transparent material to have a refractive index lower than that of the transparent material itself. 前記マイクロカプセル（マイクロバルーン）中の微小空孔の大きさが１０Åから使用波長程度であることを特徴とする請求項１記載の反射防止用多孔質光学材料。 The microcapsules porous optical material for preventing reflection of claim 1, wherein the size of the minute pores in (microballoons) is the order of the wavelength used from 10 Å. 前記透明材料が高分子材料からなることを特徴とする請求項１又は２記載の反射防止用多孔質光学材料。 3. The antireflection porous optical material according to claim 1, wherein the transparent material is made of a polymer material. 屈折率に分布を持たせたことを特徴とする請求項１から３の何れか１項記載の反射防止用多孔質光学材料。 Porous optical material for preventing the reflection of any one of claims 1 to 3, characterized in that gave a distribution in refractive index. 光学薄膜材料として用いたことを特徴とする請求項１から４の何れか１項記載の反射防止用多孔質光学材料。 Porous optical material for antireflection according to any one of claims 1 4, characterized in that used as an optical thin film material.
JP2004031037A 2004-02-06 2004-02-06 Porous optical material for antireflection Expired - Lifetime JP3649407B2 (en)

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JP2002036645A Division JP3549108B2 (en) 2002-02-14 2002-02-14 Anti-reflective porous optical material

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WO2006030695A1 (en) * 2004-09-13 2006-03-23 Nitto Denko Corporation Process for producing porous material, porous material, antireflective film, process for producing antireflective sheet, and antireflective sheet

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