JPS5964802A - Circular polarization plate - Google Patents
Circular polarization plateInfo
- Publication number
- JPS5964802A JPS5964802A JP57175863A JP17586382A JPS5964802A JP S5964802 A JPS5964802 A JP S5964802A JP 57175863 A JP57175863 A JP 57175863A JP 17586382 A JP17586382 A JP 17586382A JP S5964802 A JPS5964802 A JP S5964802A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- polarizing plate
- plate
- circularly polarizing
- refractive index
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000010287 polarization Effects 0.000 title abstract 9
- 238000000149 argon plasma sintering Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 abstract description 14
- 230000007613 environmental effect Effects 0.000 abstract description 5
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 abstract description 4
- 229910001635 magnesium fluoride Inorganic materials 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 abstract description 2
- 230000003449 preventive effect Effects 0.000 abstract 6
- 229920002678 cellulose Polymers 0.000 abstract 1
- 239000001913 cellulose Substances 0.000 abstract 1
- 238000010030 laminating Methods 0.000 abstract 1
- 238000002310 reflectometry Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000012780 transparent material Substances 0.000 description 3
- 229920002284 Cellulose triacetate Polymers 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920006289 polycarbonate film Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Surface Treatment Of Optical Elements (AREA)
- Polarising Elements (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は円偏光板、さらに詳しくは、反射防止層付円偏
光板に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circularly polarizing plate, and more particularly to a circularly polarizing plate with an antireflection layer.
従来の円偏光板は偏光板と位相差板を重ね合わせた構成
から成り、ブラウン管の蛍光面や発光表示素子の前面に
設置して、被観測光の観測を妨害する環境光の反射抑制
に用いられている。しかし、従来の円偏光板の反射抑制
効果は、偏光板の側から円偏光板に入射してくる光のう
ち、円偏光板内へ侵入した光の成分だけが、円偏光板を
構成する偏光板と位相差板の相乗的な光学作用により、
振幅が弱められて外部に反射される結果であって、総反
射光のうちには、円偏光板内部に侵入せずその表面、即
ち偏光板の表面で反射されてくる光の成分も含まれてい
る。従って総合的な反射率は必ずしも充分に小さくなく
、上記のように反射防止板として用いるような場合、環
境光の強さ及び方向によっては反射防止効果を充分に発
揮しないという欠点がある。Conventional circularly polarizing plates consist of a polarizing plate and a retardation plate stacked on top of each other, and are installed in front of the fluorescent screen of a cathode ray tube or light emitting display element to suppress the reflection of environmental light that interferes with the observation of the observed light. It is being However, the reflection suppression effect of conventional circularly polarizing plates is such that of the light that enters the circularly polarizing plate from the polarizing plate side, only the component of the light that has entered the circularly polarizing plate is polarized by the circularly polarizing plate. Due to the synergistic optical action of the plate and retardation plate,
As a result, the amplitude is weakened and reflected to the outside, and the total reflected light also includes light components that do not enter the inside of the circularly polarizing plate and are reflected from the surface of the circularly polarizing plate, that is, the surface of the polarizing plate. ing. Therefore, the overall reflectance is not necessarily sufficiently small, and when used as an antireflection plate as described above, there is a drawback that the antireflection effect may not be sufficiently exhibited depending on the intensity and direction of the environmental light.
本発明は、このような従来の円偏光板の欠点が除去され
、視感補正された反射率が高々十数パーセントに抑えら
れた円偏光板の提供を目的としている。An object of the present invention is to provide a circularly polarizing plate that eliminates the drawbacks of conventional circularly polarizing plates and has a luminous-corrected reflectance suppressed to at most ten or more percent.
以上の目的のため、本発明による円偏光板は偏光板と、
この偏光板の一方の面に密着した位相差板と、他方の面
に形成された反射防止層とから成り、この反射防止層は
光の干渉現象または散乱現象を利用した反射防止層から
構成されている。For the above purpose, the circularly polarizing plate according to the present invention includes a polarizing plate,
This polarizing plate consists of a retardation plate closely attached to one surface and an anti-reflection layer formed on the other surface. ing.
本発明の円偏光板に用いられている反射防止層について
、光の干渉現象を利用した干渉型反射防止層の場合と、
光の散乱現象を利用した散乱型反射防止層の場合に分け
て説明する。Regarding the antireflection layer used in the circularly polarizing plate of the present invention, there are two cases of an interference type antireflection layer that utilizes the interference phenomenon of light,
A case of a scattering type antireflection layer that utilizes a light scattering phenomenon will be explained separately.
ｉｌ＋ 干渉型反射防止層
一般に、ガラスなどの透明体の表面に、その物質の屈折
率より小さい屈折率を有する別の透明体の層を設けると
、光の反射率が小さくなり、その透明体層の「光学的厚
さ」が×波長の場合、その波長の光に対する反射率は最
小となる。さらにその透明体層の屈折率が、その両側の
物質（透明体層が一層の場合は、片側は一般に空気）の
屈折率の相乗平均に等しい場合には、その波長に対する
反射率は０になる。本発明に用いられる反射防止層はこ
の原理に基づいて構成されている。反射防止層が１層で
ある場合、反射防止層を設ける側の円偏光層表面物質の
屈折率、即ち、偏光板の屈折率をｎｏ、反射防止層の屈
折率をｎｌ、空気の屈折率をｎａとすれば、理想的には
、
ｎ １＝ 、、 ｎ □ −ｎ ａ ＋−−−−−
−−−−−−（１１が成り立つことが望ましい。なお、
反射防止層が２層および３層から成る場合について、各
層の屈折率の関係をそれぞれ式（２）および式（３）に
示す。il+ Interference type anti-reflection layer Generally, when a layer of another transparent material having a refractive index smaller than that of the material is provided on the surface of a transparent material such as glass, the reflectance of light decreases, and the transparent material layer When the "optical thickness" of is x wavelength, the reflectance for light of that wavelength is minimum. Furthermore, if the refractive index of the transparent layer is equal to the geometric mean of the refractive index of the materials on both sides (if the transparent layer is one layer, one side is generally air), then the reflectance for that wavelength will be 0. . The antireflection layer used in the present invention is constructed based on this principle. When the antireflection layer is one layer, the refractive index of the surface material of the circularly polarizing layer on the side on which the antireflection layer is provided, that is, the refractive index of the polarizing plate is no, the refractive index of the antireflection layer is nl, and the refractive index of air is If na, ideally, n 1= ,, n □ −na +−−−−−
--------(It is desirable that 11 holds.In addition,
In the case where the antireflection layer consists of two layers and three layers, the relationship between the refractive index of each layer is shown in Equation (2) and Equation (3), respectively.
ｎ １、ＦＷｉ＝ｎ２ 、、「１石、 曲−（２１ｎ
１− ｎ ３ ＝ ｎ ２ ＦＴ「Ｔｉｉ、 −−−−
−＋３１ここで添字Ｏは円偏光層表面物質を、０以外の
数字の添字は円偏光層側から数えた各層の順番を、また
、添字ａは空気を意味する。n 1, FWi=n2,, ``1 stone, song - (21n
1- n 3 = n 2 FT "Tii, -----
-+31 Here, the subscript O means the surface material of the circularly polarizing layer, the subscript with a number other than 0 means the order of each layer counted from the circularly polarizing layer side, and the subscript a means air.
円偏光層の、反射防止層を設ける側の表面物質（括弧内
は屈折率）には、トリアセチルセルローズ（ｎｏ ＝１
．４９〜１．５０） 、セルロースアセテートブチレー
ト（ｎｏ ＝１．４６〜１．４９）、アクリル樹脂（ｎ
ｏ ＝１．４９〜１．５１）、ポリエステル（ｎ（１＝
１．５８）、ポリアミド（ｎｏ −１，５１〜１．５４
） 、ポリカーボネート（ｎＯ＝１．５８）、ポリサル
ホン（ｎｏ ＝、１．６３）およびその他の熱可塑性プ
ラスチックが一般に使用されている。反射防止層の材料
には、理想的には式（１）の関係を満足する、これらの
物質より屈折率の小さい物質を用いるわけであるが、実
際に使用し得る物質としては、弗化マグネシウム（ｎ＝
１．３９） 、ポリテトラフルオロエチレン（ｎ＝１．
３５）などの含弗素ポリマー、二酸化ケイ素（ｎ＝１．
４５）、氷晶石（ｎ−１，３５）が代表的な物質として
挙げられる。ただし含弗素ポリマーは機械的強度があま
り大きくなく、使用条件に制約をうけることがある。反
射防止層を２層ないし、３層構造とする場合には、先に
掲げた式（２）ないし式（３）を考慮して、各層の物質
を選択すればよい。The surface material of the circularly polarizing layer on the side where the antireflection layer is provided (the refractive index is in parentheses) is triacetylcellulose (no = 1
．． 49-1.50), cellulose acetate butyrate (no = 1.46-1.49), acrylic resin (n
o = 1.49 to 1.51), polyester (n (1 =
1.58), polyamide (no -1,51~1.54
), polycarbonate (nO = 1.58), polysulfone (no =, 1.63) and other thermoplastics are commonly used. Ideally, a material that satisfies the relationship expressed by formula (1) and has a smaller refractive index than these materials is used as the material for the antireflection layer, but in practice, magnesium fluoride, (n=
1.39), polytetrafluoroethylene (n=1.
Fluorine-containing polymers such as 35), silicon dioxide (n=1.
45), cryolite (n-1, 35) is mentioned as a typical substance. However, fluorine-containing polymers do not have very high mechanical strength and may be subject to restrictions on usage conditions. When the antireflection layer has a two-layer or three-layer structure, the materials for each layer may be selected in consideration of the formulas (2) and (3) listed above.
なお、干渉型反射防止層を用いて反射強度を抑制する方
法は、単に円偏光板表面の反射を抑えるだけでなく、反
射防止層の反射率が最低になる波長を、円偏光層目体の
反射特性に応じて適当に選択し、人間の視覚感度を考慮
して視感的に反射防止効果を最大になし得るという特長
を有する。Note that the method of suppressing the reflection intensity using an interference type anti-reflection layer is not only to suppress the reflection on the surface of the circularly polarizing plate, but also to adjust the wavelength at which the reflectance of the anti-reflection layer is the lowest to the wavelength of the circularly polarizing layer. It has the advantage of being able to maximize the visual antireflection effect by selecting it appropriately according to the reflection characteristics and taking human visual sensitivity into consideration.
（２） 散乱型反射防止層
散乱型反射防止層は、入射光をあらゆる方向にできるだ
け均一に乱反射させることにより、円偏光板面に環境光
による鏡像が現われるのを防ぐ方式の反射防止層である
。円偏光層表面に散乱型反射防止層を形成するには、サ
ンドブラスト処理、エンボス加工など機械的手段や光散
乱剤の塗布、あるいは化学的処理により表面に光の散乱
層を形成する方法がある。いづれにせよ、この散乱層の
光学的特性は、入射角４５°に対して、反射角４５°に
おける反射率が１％以上２５％以下の範囲にあることが
必要で、望ましくは、５〜１５％の範囲にあることであ
る。即ち、反射率が２５％より大きい場合には、環境光
による鏡、像の発生が有効に阻止されず、まだ１％より
小さければ、円偏光板の透過光に対する散乱が大きくな
り、円偏光板を通して観測すべき表示文字など、被観測
体の解像度を低下させる。(2) Scattering type anti-reflection layer The scattering type anti-reflection layer is an anti-reflection layer that prevents mirror images caused by environmental light from appearing on the circularly polarizing plate surface by diffusing incident light as uniformly as possible in all directions. . To form a scattering antireflection layer on the surface of the circularly polarizing layer, there are methods of forming a light scattering layer on the surface by mechanical means such as sandblasting or embossing, coating with a light scattering agent, or chemical treatment. In any case, the optical properties of this scattering layer require that the reflectance at a reflection angle of 45° with respect to an incident angle of 45° is in the range of 1% to 25%, preferably 5 to 15%. % range. That is, if the reflectance is greater than 25%, the generation of a mirror or image due to environmental light is not effectively prevented, and if it is still less than 1%, the light transmitted through the circularly polarizing plate will be heavily scattered, causing the circularly polarizing plate to Reduces the resolution of objects to be observed, such as displayed characters that should be observed through.
以下に本発明の実施例と、実施例の効果につき順に説明
する。Examples of the present invention and effects of the examples will be explained below in order.
先づ本発明の第１の実施例を、その断面図を示す第１図
に基づいて説明する。同図において、位相差板２Ｂとト
リアセチルセルローズを用いた偏光板２人より成る円偏
光層２は波長６１０ｎｍに最小反射率を有し、偏光板２
Ａの表面に弗化マグネシウムが厚さ９８ｎｍに真空蒸着
されて反射防止層１が形成されている。First, a first embodiment of the present invention will be described based on FIG. 1 showing a sectional view thereof. In the figure, a circularly polarizing layer 2 consisting of a retardation plate 2B and two polarizing plates using triacetyl cellulose has a minimum reflectance at a wavelength of 610 nm, and the polarizing plate 2
Magnesium fluoride is vacuum-deposited on the surface of A to a thickness of 98 nm to form an antireflection layer 1.
本発明の第２の実施例をその断面を示す第２図に基づい
て説明する。円偏光層２は第１図に示した上記第１の実
施例における円偏光層と同じものを使用している。反射
防止層１は、酸化アンチモンを厚さ６３ｎｍに真空蒸着
した第１の層ＩＡとその上に、さらに厚さ９５ｎｍに弗
化マグネシウムを真空蒸着して構成された第２の層ＩＢ
との２つの層から成っている。A second embodiment of the present invention will be described based on FIG. 2 showing a cross section thereof. The circularly polarizing layer 2 is the same as the circularly polarizing layer in the first embodiment shown in FIG. 1. The antireflection layer 1 includes a first layer IA in which antimony oxide is vacuum-deposited to a thickness of 63 nm, and a second layer IB in which magnesium fluoride is further vacuum-deposited to a thickness of 95 nm thereon.
It consists of two layers.
本発明の第３の実施例は、第２図に示した第２の実施例
と同様、反射防止層１は真空蒸着法による酸化アンチモ
ンよりなる第１の層ＩＡと、同じく真空蒸着法により形
成された弗化マグネシウムより成る第２のＮＩＢより構
成されているが、円偏光Ｎ２を構成する偏光板２Ａの構
成物質はポリカーボネートで、円偏光層２自体の反射率
は波長５４０ｎｍで最小値を示す。また、反射防止層１
を構成する第１の層ＩＡと第２の層ＩＢの厚さは、それ
ぞれ１５０ｎｍおよび１１０ｎｍである。In the third embodiment of the present invention, similarly to the second embodiment shown in FIG. However, the constituent material of the polarizing plate 2A constituting the circularly polarized light N2 is polycarbonate, and the reflectance of the circularly polarizing layer 2 itself shows a minimum value at a wavelength of 540 nm. . In addition, antireflection layer 1
The thicknesses of the first layer IA and the second layer IB constituting the are 150 nm and 110 nm, respectively.
本発明の第４の実施例を、その断面を示す第３図と、部
分切欠斜視図である第４図に基づいて説明する。反射防
止層１は、光散乱剤を塗布して表面の４５″″正反射率
を５．２％としたポリカーボネートのフィルムで、円偏
光Ｎ２の偏光板２Ａに接着されている。円偏光層２は、
その最小反射率が波長５５０ｎｍに現われるようにする
ため、互いの光軸方向を４５°ずらして貼り合わされた
偏光板２Ａと位相差板２Ｂより構成されている。第４図
において偏光板２Ａおよび位相差板２Ｂの表面に画かれ
た矢印は、それぞれ光軸の方向を示している。本実施例
においては、さらに未処理のポリカーボネートフィルム
３が位相差板の下面に、アクリルウレタン樹脂系の接着
剤を用いて接着されている。A fourth embodiment of the present invention will be described with reference to FIG. 3, which shows a cross section thereof, and FIG. 4, which shows a partially cutaway perspective view. The antireflection layer 1 is a polycarbonate film coated with a light scattering agent so that the 45'' specular reflectance of the surface is 5.2%, and is adhered to the polarizing plate 2A for circularly polarized light N2. The circularly polarizing layer 2 is
In order to make the minimum reflectance appear at a wavelength of 550 nm, it is composed of a polarizing plate 2A and a retardation plate 2B which are bonded together with their optical axes shifted by 45 degrees. In FIG. 4, arrows drawn on the surfaces of the polarizing plate 2A and the retardation plate 2B each indicate the direction of the optical axis. In this embodiment, an untreated polycarbonate film 3 is further bonded to the lower surface of the retardation plate using an acrylic urethane resin adhesive.
本発明の第５の実施例では、反射防止層の形成に特に別
の物質を用いず、円偏光層を構成するポリエステル（ポ
リエチレンテレフタレート）製の偏光板の表面を直接サ
ンドブラスト処理することによって反射防止層が形成さ
れている（第５図における破線より上の部分）。なお、
本実施例に用いた円偏光層自体の最小反射率は波長５５
０ｎｍの所にある。In the fifth embodiment of the present invention, the antireflection layer is formed by directly sandblasting the surface of the polarizing plate made of polyester (polyethylene terephthalate), which constitutes the circularly polarizing layer, without using any other substance. A layer is formed (above the broken line in FIG. 5). In addition,
The minimum reflectance of the circularly polarizing layer itself used in this example was at wavelength 55.
It is located at 0 nm.
次に、以上の実施例の効果を示す光学的特性を反射防止
層に干渉型反射防止層を用いた場合（第１．第２および
第３の実施例）と、散乱型反射防止層を用いた場合（第
４および第５の実施例）に分けて、それぞれ表１および
表２に示す。画表において「１０°正反射率」とは、入
射角１０°、反射光測定方位角１０°としたときの入射
光強度に対する反射光強度の比を、「４５°正反射率」
とは入射角、反射光測定方位角とも４５°としたときの
入射光強度に対する反射光強度の比を表わす。Next, we will examine the optical properties showing the effects of the above examples when an interference type antireflection layer is used as the antireflection layer (Examples 1, 2, and 3) and when a scattering type antireflection layer is used. Tables 1 and 2 show the cases in which the results were obtained (fourth and fifth examples), respectively. In the diagram, "10° regular reflectance" means "45° regular reflectance" which is the ratio of reflected light intensity to incident light intensity when the incident angle is 10° and the reflected light measurement azimuth is 10°.
represents the ratio of the reflected light intensity to the incident light intensity when both the incident angle and the reflected light measurement azimuth angle are 45°.
表１：干渉型反射防止層付円偏光板
表２：散乱型反射防止層付円偏光板
また「反射体上での反射率」とは、テストすべき円偏光
板の裏側に反射率９０％の鏡をおき、円偏光板を透過し
た光線のこの鏡による反射成分をも含めて、入射角、反
射光測定方位角をともに３０”にしたときの、入射光強
度に対する反射光強度の比であり、この値が小さい程反
射防止効果が太きい。但し表中の数値そのものは上記の
ように定義され測定された物理量を、人間の視感度曲線
に基づいて補正した値である。「解像度」は縦および横
の寸法が共にａｍｍに画かれた文字“Ｍ”を、テストす
べき円偏光板を通して透視したときの判別可能な最小文
字の大きさをａの値で示したものであり、この値の小さ
いもの程被観測体が明確に見えるものである。文字板、
円偏光板および観測点の位置関係を第５図に示した。Ａ
は観測者の目の位置、Ｂは円偏光板、Ｃは文字板である
。なお、「参照円偏光板」とは本発明の第１の実施例の
構成に用いた、反射防止層の設けられていない、「裸の
」円偏光層のみから成る円偏光板のことである。上掲の
表から明らかなように、反射防止層を有しない円偏光板
と比較して、本発明による円偏光板はすべて反射率、反
射防止効果とも大幅に改善されており、特に第５の実施
例を除けば、改善の度合は１桁におよんでいる。しかも
、干渉型反射防止層を有する円偏光板の場合、解像の低
下はまったくみられない。Table 1: Circularly polarizing plate with interference type anti-reflection layer Table 2: Circularly polarizing plate with scattering type anti-reflection layer Also, "reflectance on the reflector" means that the back side of the circularly polarizing plate to be tested has a reflectance of 90%. The ratio of the intensity of reflected light to the intensity of incident light when a mirror is placed and both the angle of incidence and the azimuth angle of reflected light measurement are 30'', including the reflected component of the light beam transmitted through the circularly polarizing plate by this mirror. The smaller this value is, the stronger the anti-reflection effect is. However, the numbers in the table themselves are the physical quantities defined and measured above, corrected based on the human visibility curve. "Resolution" is the minimum distinguishable character size when the letter "M", whose vertical and horizontal dimensions are both amm, is seen through the circularly polarizing plate to be tested, is expressed as the value of a. The smaller the value, the more clearly the observed object can be seen. dial,
Figure 5 shows the positional relationship between the circularly polarizing plate and the observation points. A
is the position of the observer's eyes, B is the circular polarizer, and C is the dial. Note that the "reference circularly polarizing plate" refers to a circularly polarizing plate that is used in the configuration of the first embodiment of the present invention and is composed of only a "naked" circularly polarizing layer without an antireflection layer. . As is clear from the table above, all circularly polarizing plates according to the present invention have significantly improved reflectance and antireflection effect compared to circularly polarizing plates that do not have an antireflection layer. With the exception of Examples, the degree of improvement is in the order of magnitude. Furthermore, in the case of a circularly polarizing plate having an interference-type antireflection layer, no reduction in resolution is observed at all.
第１図は本発明の第１の実施例、第２図は本発明の第２
および第３の実施例の、それぞれ構成を示す断面図であ
る。第３図と第４図は、本発明の第４の実施例の構成を
示す、それぞれ断面図と部分切欠斜視図、第５図は本発
明の第５の実施例の構成を示す断面図である。第６図は
、本発明による円偏光板を通して物体を見た場合の解像
度を測定する方法を説明する図である。
１−・反射防止層
２−・−円偏光層 ２Ａ−偏光板
２Ｂ−・−位相差板 ３−支持体
Ａ −観測者 Ｂ −円偏光板
ｃ −文字板
特許出願人 日東電気工業株式会社代理人 弁
理土面１）新FIG. 1 shows a first embodiment of the present invention, and FIG. 2 shows a second embodiment of the present invention.
and FIG. 7 is a cross-sectional view showing the configuration of a third embodiment. 3 and 4 are a cross-sectional view and a partially cutaway perspective view, respectively, showing the structure of a fourth embodiment of the present invention, and FIG. 5 is a cross-sectional view showing the structure of a fifth embodiment of the present invention. be. FIG. 6 is a diagram illustrating a method for measuring resolution when an object is viewed through a circularly polarizing plate according to the present invention. 1--Anti-reflection layer 2--Circularly polarizing layer 2A-Polarizing plate 2B--Retardation plate 3-Support A -Observer B -Circularly polarizing plate c -Dial plate patent applicant Nitto Electric Industries Co., Ltd. agent Person Patent Law 1) New
Claims (1)
差板と、他方の面に形成された反射防止層とから成る円
偏光板。 （２） 反射防止層が干渉型反射防止層で構成された
、特許請求の範囲第１項記載の円偏光板。 （３）偏光板と位相差板から成る２Ｎ構造体部分の、偏
光板の側での反射率が最小となる光の波長と、反射防止
層の反射率が最小となる光の波長が２０ｎｍ以上異なる
ことを特徴とする特許請求の範囲第２項記載の円偏光板
。 ＋４１ 反射防止層が光散乱型反射防止層で構成され
た、特許請求の範囲第１項記載の円偏光板。 （５）反射防止層の４５°正反射率が１％以上２５％以
下の範囲ある特許請求の範囲第４項記載の円偏光板。[Scope of Claims] (1) A circularly polarizing plate consisting of a polarizing plate, a retardation plate in close contact with one surface of the polarizing plate, and an antireflection layer formed on the other surface. (2) The circularly polarizing plate according to claim 1, wherein the antireflection layer is an interference type antireflection layer. (3) The wavelength of light at which the reflectance on the polarizing plate side of the 2N structure portion consisting of a polarizing plate and a retardation plate is minimum and the wavelength of light at which the reflectance of the antireflection layer is minimum are 20 nm or more. The circularly polarizing plate according to claim 2, which is different from the above. +41 The circularly polarizing plate according to claim 1, wherein the antireflection layer is a light scattering antireflection layer. (5) The circularly polarizing plate according to claim 4, wherein the antireflection layer has a 45° regular reflectance of 1% to 25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57175863A JPS5964802A (en) | 1982-10-05 | 1982-10-05 | Circular polarization plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57175863A JPS5964802A (en) | 1982-10-05 | 1982-10-05 | Circular polarization plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5964802A true JPS5964802A (en) | 1984-04-12 |
Family
ID=16003513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57175863A Pending JPS5964802A (en) | 1982-10-05 | 1982-10-05 | Circular polarization plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5964802A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6170807U (en) * | 1984-10-12 | 1986-05-14 | ||
| JPS6176402U (en) * | 1984-10-24 | 1986-05-22 | ||
| JPS629303A (en) * | 1985-07-06 | 1987-01-17 | Nitto Electric Ind Co Ltd | Polarizing plate |
| JPH0212106A (en) * | 1988-06-29 | 1990-01-17 | Nec Corp | Birefringent diffraction grating type polarizer |
| JPH02102502U (en) * | 1989-02-01 | 1990-08-15 | ||
| US5375012A (en) * | 1991-06-13 | 1994-12-20 | Corning Incorporated | Birefringent glass waveplate |
| US5627676A (en) * | 1994-12-02 | 1997-05-06 | Corning Incorporated | Birefringent glass waveplate containing copper halide crystals |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5023312U (en) * | 1973-06-27 | 1975-03-15 | ||
| JPS51106449A (en) * | 1975-03-14 | 1976-09-21 | Sanyo Electric Co | HENKOKI |
| JPS5593109A (en) * | 1979-01-05 | 1980-07-15 | Optical Coating Laboratory Inc | Contrast accelerating filter and making same |
| JPS5734507A (en) * | 1980-08-11 | 1982-02-24 | Seiko Epson Corp | Polarizing plate |
-
1982
- 1982-10-05 JP JP57175863A patent/JPS5964802A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5023312U (en) * | 1973-06-27 | 1975-03-15 | ||
| JPS51106449A (en) * | 1975-03-14 | 1976-09-21 | Sanyo Electric Co | HENKOKI |
| JPS5593109A (en) * | 1979-01-05 | 1980-07-15 | Optical Coating Laboratory Inc | Contrast accelerating filter and making same |
| JPS5734507A (en) * | 1980-08-11 | 1982-02-24 | Seiko Epson Corp | Polarizing plate |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6170807U (en) * | 1984-10-12 | 1986-05-14 | ||
| JPS6176402U (en) * | 1984-10-24 | 1986-05-22 | ||
| JPS629303A (en) * | 1985-07-06 | 1987-01-17 | Nitto Electric Ind Co Ltd | Polarizing plate |
| JPH0212106A (en) * | 1988-06-29 | 1990-01-17 | Nec Corp | Birefringent diffraction grating type polarizer |
| JPH02102502U (en) * | 1989-02-01 | 1990-08-15 | ||
| US5375012A (en) * | 1991-06-13 | 1994-12-20 | Corning Incorporated | Birefringent glass waveplate |
| US5627676A (en) * | 1994-12-02 | 1997-05-06 | Corning Incorporated | Birefringent glass waveplate containing copper halide crystals |
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