JPH05100114A - Laminated wavelength plate and circularly polarizing plate - Google Patents

Laminated wavelength plate and circularly polarizing plate

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Publication number
JPH05100114A
JPH05100114A JP28717391A JP28717391A JPH05100114A JP H05100114 A JPH05100114 A JP H05100114A JP 28717391 A JP28717391 A JP 28717391A JP 28717391 A JP28717391 A JP 28717391A JP H05100114 A JPH05100114 A JP H05100114A
Authority
JP
Japan
Prior art keywords
wavelength
plate
laminated
phase difference
polarizing plate
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.)
Granted
Application number
JP28717391A
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Japanese (ja)
Other versions
JP3174367B2 (en
Inventor
Tominari Araki
Tatsuki Nagatsuka
Hiroyuki Yoshimi
裕之 吉見
富成 荒木
辰樹 長塚
Original Assignee
Nitto Denko Corp
日東電工株式会社
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Abstract

PURPOSE:To obtain the laminated wavelength plate which lessens a change in the phase difference according to a change in wavelength and gives the prescribed phase difference of 1/2 wavelength, 1/4 wavelength, etc., over a wide wave length region and the circularly polarizing plate useful as an antireflection filter which prevents reflection over a wide wavelength region, such as visible region. CONSTITUTION:This laminated wavelength plate is constituted by laminating plural stretched films 1, 3 which give the phase difference of a 1/2 wavelength to monochromatic light by intersecting the optical axes thereof. The laminated wavelength plate is otherwise constituted by laminating the plural stretched films by intersecting the optical axes thereof and consists of a combination of the stretched film which gives the phase difference of 1/2 wavelength to the monochromatic light and the stretched film which gives the phase difference of a 1/4 wavelength thereto. This circularly polarizing plate consists of the laminate of the laminated wavelength plate formed by using the above-mentioned 1/4 wavelength film and the polarizing plate.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、広い波長域にわたり1
/2波長や1/4波長等の所定の位相差を与える積層波
長板、及び広い波長域にわたり反射を防止する円偏光板
に関する。
BACKGROUND OF THE INVENTION The present invention is applicable to a wide wavelength range.
The present invention relates to a laminated wave plate that gives a predetermined phase difference such as / 2 wavelength or ¼ wavelength, and a circularly polarizing plate that prevents reflection over a wide wavelength range.

【0002】[0002]

【従来の技術】従来、1枚の延伸フィルムを用いてなる
1/2波長板や1/4波長板が知られていた。しかしな
がら、その位相差が波長ごとに異なり、1/2波長板や
1/4波長板として機能しうる波長が特定のものに限ら
れる問題点があった。
2. Description of the Related Art Conventionally, a half-wave plate and a quarter-wave plate using one stretched film have been known. However, the phase difference is different for each wavelength, and there is a problem that the wavelength that can function as a ½ wavelength plate or a ¼ wavelength plate is limited to a specific wavelength.

【0003】すなわち例えば、波長が550nmの光に対
して1/4波長板として機能するものの場合、波長が4
50nmや650nmの光に対しては1/4波長板として機
能しない。そのため、例えば偏光板に接着して円偏光板
とし、それをディスプレイ等の表面反射を抑制するため
の反射防止フィルターとして用いた場合、波長が550
nmでない光に対しては充分な反射防止機能を発揮せず、
特に青色系の光に対する反射防止機能に乏しくて、ディ
スプレイ等が青く見える問題点があった。
That is, for example, in the case of a plate that functions as a quarter-wave plate for light having a wavelength of 550 nm, the wavelength is 4
It does not function as a quarter-wave plate for light of 50 nm or 650 nm. Therefore, for example, when a circularly polarizing plate is adhered to a polarizing plate and used as an antireflection filter for suppressing surface reflection of a display or the like, the wavelength is 550.
Does not exhibit sufficient antireflection function for light that is not nm,
In particular, there is a problem that the display and the like look blue due to its poor antireflection function for blue light.

【0004】[0004]

【発明が解決しようとする課題】本発明は、全可視光域
等の広い波長域にわたって1/2波長板や1/4波長板
としてほぼ機能しうる波長板、及び反射防止の広帯域性
等に優れる円偏光板の開発を目的とする。
DISCLOSURE OF THE INVENTION The present invention provides a wavelength plate that can substantially function as a half-wave plate or a quarter-wave plate over a wide wavelength range such as the entire visible light range, and a broadband property of antireflection. The purpose is to develop an excellent circularly polarizing plate.

【0005】[0005]

【課題を解決するための手段】本発明は、単色光に対し
て1/2波長の位相差を与える複数の延伸フィルムをそ
れらの光軸を交差させて積層してなることを特徴とする
積層波長板、及び複数の延伸フィルムをそれらの光軸を
交差させて積層してなり、その延伸フィルムが単色光に
対して1/2波長の位相差を与えるものと、1/4波長
の位相差を与えるものとの組合せからなることを特徴と
する積層波長板、並びに前記の1/4波長フィルムを用
いた積層波長板と偏光板との積層体からなることを特徴
とする円偏光板を提供するものである。
The present invention is characterized in that a plurality of stretched films which give a phase difference of ½ wavelength to monochromatic light are laminated with their optical axes intersecting each other. A wave plate and a plurality of stretched films are laminated with their optical axes intersecting each other, and the stretched film gives a phase difference of ½ wavelength to a monochromatic light and a phase difference of ¼ wavelength. And a circularly polarizing plate comprising a laminated body of a laminated wavelength plate and a polarizing plate using the above-mentioned quarter wavelength film. To do.

【0006】[0006]

【作用】単色光に対して1/2波長又は1/4波長の位
相差を与える延伸フィルムの複数枚をそれらの光軸を交
差させて積層することにより、複屈折光の屈折率差(△
n)と厚さ(d)の積(△nd)で定義されるリタデー
ションの波長分散を重畳ないし加減できて任意に制御で
き、全体としての位相差を所定の値に制御しつつ波長分
散を抑制して、広い波長域にわたり所定の位相差を示す
波長板を得ることができる。
The refractive index difference (Δ) of birefringent light is obtained by laminating a plurality of stretched films that give a phase difference of ½ wavelength or ¼ wavelength to monochromatic light with their optical axes intersecting.
The wavelength dispersion of the retardation defined by the product (Δnd) of n) and the thickness (d) can be superimposed or adjusted to control it arbitrarily, and suppress the wavelength dispersion while controlling the phase difference as a whole to a predetermined value. Thus, it is possible to obtain a wave plate exhibiting a predetermined phase difference over a wide wavelength range.

【0007】[0007]

【実施例】本発明の積層波長板は、単色光に対して1/
2波長の位相差を与える複数の延伸フィルムをそれらの
光軸を交差させて積層したものである。図1にその例を
示した。1,3が1/2波長の位相差を与える延伸フィ
ルム、2は透明な接着層である。延伸フィルムの積層数
は任意であるが、光の透過率などの点より2〜5枚の積
層が一般的である。
EXAMPLES The laminated wave plate of the present invention is 1 /
A plurality of stretched films that give a retardation of two wavelengths are laminated with their optical axes intersecting. An example is shown in FIG. Stretched films 1 and 3 give a retardation of ½ wavelength, and 2 is a transparent adhesive layer. The number of laminated stretched films is arbitrary, but from the viewpoint of light transmittance and the like, generally 2 to 5 laminated layers are used.

【0008】1/2波長板を得るための各延伸フィルム
の光軸の交差角度は、例えば次式で算出されるものを基
本例としてあげることができる。すなわち、積層数を
N、入射直線偏光方向を基準(0°)にして波長板透過
後の出射直線偏光方向(θ)の角度をθとした場合、各
1/2波長フィルムの角度θKは、θK=(2K−1)・
θ/2N(ただし、Kは1〜Nの整数値)により求めら
れる。
The crossing angle of the optical axes of the respective stretched films for obtaining the half-wave plate can be calculated by the following formula as a basic example. That is, when the number of laminated layers is N and the angle of the outgoing linearly polarized light direction (θ) after passing through the wave plate is θ with reference to the incident linearly polarized light direction (0 °), the angle θ K of each ½ wavelength film is , Θ K = (2K-1) ・
θ / 2N (where K is an integer value of 1 to N).

【0009】一方、本発明の他の積層波長板は、単色光
に対して1/2波長の位相差を与える延伸フィルムと1
/4波長の位相差を与える延伸フィルムとの組合せで複
数の延伸フィルムを用いて、それら延伸フィルムの光軸
を交差させて積層したものである。その例を図2に示し
た。1,3が1/2波長の位相差を与える延伸フィル
ム、4が1/4波長の位相差を与える延伸フィルム、2
は透明な接着層である。
On the other hand, another laminated wave plate of the present invention comprises a stretched film and a stretched film which give a phase difference of ½ wavelength to monochromatic light.
A plurality of stretched films are used in combination with a stretched film that gives a retardation of / 4 wavelength, and the stretched films are laminated with their optical axes intersecting each other. An example thereof is shown in FIG. Stretched films 1 and 3 give a retardation of 1/2 wavelength, 4 stretched films give a retardation of 1/4 wavelength, 2
Is a transparent adhesive layer.

【0010】1/4波長板を得るための条件は、単色光
に対して1/2波長の位相差を与える延伸フィルムと1
/4波長の位相差を与える延伸フィルムを用いること、
及び積層する各延伸フィルムの光軸を交差させることで
ある。
The conditions for obtaining a quarter-wave plate are: a stretched film that gives a half-wave retardation to monochromatic light;
Using a stretched film that gives a retardation of / 4 wavelength;
And intersecting the optical axes of the respective stretched films to be laminated.

【0011】前記の単色光に対して1/2波長の位相差
を与える延伸フィルムと1/4波長の位相差を与える延
伸フィルムを用いる点に関し、延伸フィルムの積層数は
任意である。光の透過率などの点より2〜5枚の積層が
一般的である。また、1/2波長の位相差を与える延伸
フィルムと1/4波長の位相差を与える延伸フィルムの
配置位置も任意である。
Regarding the point of using the stretched film which gives a retardation of ½ wavelength and the stretched film which gives a retardation of ¼ wavelength to the monochromatic light, the number of laminated stretched films is arbitrary. From the viewpoint of light transmittance and the like, a stack of 2 to 5 sheets is generally used. Further, the positions where the stretched film that gives a retardation of ½ wavelength and the stretched film that gives a retardation of ¼ wavelength are arbitrary.

【0012】前記において、1/4波長の位相差を与え
る延伸フィルムを1枚用いてそれを積層波長板の出射側
端に配置する場合を例として、各延伸フィルムの光軸の
交差角度と各延伸フィルムを出た偏光の方向(θ)の関
係は次式で表される。すなわち、1/2波長の位相差を
与える延伸フィルムの使用数をnとしてそれらをλ/2
(1,2,・・・n)で表し、入射直線偏光方向を基準
(0°)にして各λ/2(1,2,・・・n)の積層角
度をθ1、θ2、・・・θnとすると、 積層角度=2(θ1+θ2+・・・+θn-1)+θn 各λ/2板を出た偏光の方向=2(θ1+θ2
・・・+θn)で表され、それに1/4波長の位相差を
与える延伸フィルムを45度の角度で積層することによ
り円偏光が得られる。
In the above, a phase difference of 1/4 wavelength is given.
The stretched film is used as a stretched film
Taking the case of arranging at the edge as an example,
The relationship between the crossing angle and the direction of polarization (θ) exiting each stretched film
The relation is expressed by the following equation. That is, the phase difference of 1/2 wavelength
Let n be the number of stretched films to be used and give them λ / 2.
Expressed as (1, 2, ... n), the incident linear polarization direction is the reference
(0 °) and stacking angle of each λ / 2 (1, 2, ... n)
Degree is θ1, Θ2, ... θnThen, stacking angle = 2 (θ1+ Θ2+ ... + θn-1) + Θn  Direction of polarized light exiting each λ / 2 plate = 2 (θ1+ Θ2+
... + θn), And the phase difference of 1/4 wavelength is added to it.
By laminating the stretched films to give at an angle of 45 degrees
A circularly polarized light is obtained.

【0013】前記した関係を、1/2波長の位相差を与
える延伸フィルムを3枚(λ/2(1,2,3))用い
た場合を例に次表に示した。なお、λ/4は1/4波長
の位相差を与える延伸フィルムを表す。
The above relationship is shown in the following table by taking as an example the case where three stretched films (λ / 2 (1,2,3)) which give a retardation of ½ wavelength are used. In addition, λ / 4 represents a stretched film that gives a retardation of ¼ wavelength.

【0014】本発明において用いる、単色光に対して1
/2波長又は1/4波長の位相差を与える延伸フィルム
は、例えば高分子フィルムを一軸、ないし二軸等で延伸
処理する方法などにより得ることができる。
1 for monochromatic light used in the present invention
The stretched film that gives a retardation of / 2 wavelength or ¼ wavelength can be obtained by, for example, a method of stretching a polymer film uniaxially or biaxially.

【0015】延伸フィルムを形成する高分子の種類につ
いては特に限定はなく、透明性に優れるものが好ましく
用いられる。その例としては、ポリカーボネート系高分
子、ポリエステル系高分子、ポリスルホン系高分子、ポ
リエーテルスルホン系高分子、ポリスチレン系高分子、
ポリオレフィン系高分子、ポリビニルアルコール系高分
子、酢酸セルロース系高分子、ポリ塩化ビニル系高分
子、ポリメチルメタクリレート系高分子などがあげられ
る。
The type of polymer forming the stretched film is not particularly limited, and those having excellent transparency are preferably used. Examples include polycarbonate-based polymers, polyester-based polymers, polysulfone-based polymers, polyethersulfone-based polymers, polystyrene-based polymers,
Examples thereof include polyolefin-based polymers, polyvinyl alcohol-based polymers, cellulose acetate-based polymers, polyvinyl chloride-based polymers and polymethylmethacrylate-based polymers.

【0016】本発明の円偏光板は、上記した1/4波長
フィルムを用いた積層波長板と偏光板とを積層したもの
である。その例を図3に示した。5が偏光板、6が積層
波長板、2は透明な接着層である。円偏光板の形成は、
上記した積層角度で偏光板(5)と交差させることによ
り行うことができる。その際、偏光板の透過軸を90度
変えることにより円偏光の方向(左回り、又は右回りの
円偏光)を変換することができる。
The circularly polarizing plate of the present invention is a laminate of a laminated wave plate using the above-mentioned quarter wavelength film and a polarizing plate. An example thereof is shown in FIG. Reference numeral 5 is a polarizing plate, 6 is a laminated wave plate, and 2 is a transparent adhesive layer. The circular polarizing plate is formed by
It can be performed by intersecting with the polarizing plate (5) at the above-mentioned stacking angle. At this time, the direction of circularly polarized light (counterclockwise or clockwise circularly polarized light) can be converted by changing the transmission axis of the polarizing plate by 90 degrees.

【0017】円偏光板の形成には適宜な偏光板を用いる
ことができ、特に限定はない。一般には、ポリビニルア
ルコールの如き親水性高分子からなるフィルムを、ヨウ
素の如き二色性染料で処理して延伸したものや、ポリ塩
化ビニルの如きプラスチックフィルムを処理してポリエ
ンを配向させたものなどからなる偏光フィルム、あるい
はその偏光フィルムを封止フィルムでカバーして保護し
たものなどが用いられる。
An appropriate polarizing plate can be used for forming the circularly polarizing plate, and there is no particular limitation. Generally, a film made of a hydrophilic polymer such as polyvinyl alcohol is treated with a dichroic dye such as iodine and stretched, or a plastic film such as polyvinyl chloride is oriented with polyene. Or a polarizing film covered with a sealing film for protection.

【0018】なお、延伸フィルムの積層や、積層波長板
と偏光板の積層は、例えば透明な接着剤、ないし粘着剤
を用いて行うことができる。その接着剤等の種類につい
ては特に限定はない。構成部材の光学特性の変化防止の
点より、硬化や乾燥の際に高温のプロセスを要しないも
のが好ましく、長時間の硬化処理や乾燥時間を要しない
ものが望ましい。また積層波長板や円偏光板は、必要に
応じて粘着層等が付設され、例えば液晶セル等の被着体
に接着できる形態とされる。
The stretched films and the laminated wave plate and the polarizing plate can be laminated using, for example, a transparent adhesive or pressure-sensitive adhesive. There is no particular limitation on the type of the adhesive or the like. From the viewpoint of preventing changes in the optical characteristics of the constituent members, those that do not require a high temperature process during curing or drying are preferable, and those that do not require a long curing process or drying time are desirable. Further, the laminated wave plate and the circularly polarizing plate are provided with an adhesive layer or the like if necessary, and are in a form capable of being adhered to an adherend such as a liquid crystal cell.

【0019】本発明の1/2波長板や1/4波長板など
としての積層波長板は、反射防止フィルターないし防眩
フィルター、液晶プロジェクターなどの種々の用途に用
いることができる。
The laminated wave plate as the ½ wave plate or the ¼ wave plate of the present invention can be used for various applications such as an antireflection filter or an antiglare filter and a liquid crystal projector.

【0020】参考例1 厚さ50μmのポリカーボネートフィルムを150℃で
5%延伸処理し、複屈折光に基づいて波長550nmの光
に対して1/2波長の位相差を与えるλ/2延伸フィル
ムを得た。
Reference Example 1 A polycarbonate film having a thickness of 50 μm was stretched by 5% at 150 ° C. to obtain a λ / 2 stretched film which gives a phase difference of ½ wavelength with respect to light having a wavelength of 550 nm based on birefringent light. Obtained.

【0021】参考例2 厚さ50μmのポリカーボネートフィルムを150℃で
2.5%延伸処理し、複屈折光に基づいて波長550nm
の光に対して1/4波長の位相差を与えるλ/4延伸フ
ィルムを得た。
Reference Example 2 A polycarbonate film having a thickness of 50 μm was stretched by 2.5% at 150 ° C., and the wavelength was 550 nm based on birefringent light.
A λ / 4 stretched film that gives a phase difference of ¼ wavelength with respect to the above light was obtained.

【0022】実施例1 参考例1で得たλ/2延伸フィルム2枚をそれらの光軸
(延伸軸)が25度の角度で交差するようアクリル系粘
着剤を介して積層し、本発明による1/2波長板を得
た。
Example 1 Two λ / 2 stretched films obtained in Reference Example 1 were laminated via an acrylic pressure-sensitive adhesive so that their optical axes (stretching axes) intersect each other at an angle of 25 degrees, and according to the present invention. A half-wave plate was obtained.

【0023】実施例2 参考例1で得たλ/2延伸フィルム3枚をそれらの光軸
が上下間で30度の角度で交差するようアクリル系粘着
剤を介して積層し、本発明による1/2波長板を得た。
Example 2 The three λ / 2 stretched films obtained in Reference Example 1 were laminated with an acrylic pressure-sensitive adhesive so that their optical axes intersected at an angle of 30 degrees between the top and bottom, and 1 according to the present invention was used. A half wave plate was obtained.

【0024】実施例3 参考例1で得たλ/2延伸フィルム2枚をそれらの光軸
が27.7度の角度で交差するようアクリル系粘着剤を
介して積層し、更に参考例2で得たλ/4延伸フィルム
をその光軸が上側のλ/2延伸フィルムの光軸に対して
66度の角度で交差するようアクリル系粘着剤を介して
積層し、本発明による1/4波長板を得た。
Example 3 Two λ / 2 stretched films obtained in Reference Example 1 were laminated with an acrylic pressure-sensitive adhesive so that their optical axes intersect at an angle of 27.7 degrees, and further in Reference Example 2. The obtained λ / 4 stretched film was laminated via an acrylic pressure-sensitive adhesive so that the optical axis thereof intersected with the optical axis of the upper λ / 2 stretched film at an angle of 66 degrees, and the quarter wavelength according to the present invention was laminated. I got a board.

【0025】実施例4 実施例3で得た1/4波長板に偏光フィルム(NPF−
G1225DU、日東電工社製)をアクリル系粘着剤を
介して積層し、本発明の円偏光板を得た。なお積層は、
λ/4延伸フィルムの光軸と偏光フィルムの透過軸が1
00.2度の角度で交差するように行った。
Example 4 A polarizing film (NPF-) was added to the quarter-wave plate obtained in Example 3.
G1225DU, manufactured by Nitto Denko Corporation) was laminated via an acrylic adhesive to obtain a circularly polarizing plate of the present invention. The stack is
The optical axis of the λ / 4 stretched film and the transmission axis of the polarizing film are 1
The crossing was performed at an angle of 00.2 degrees.

【0026】比較例1 参考例1で得たλ/2延伸フィルムの1枚をそのまま1
/2波長板として用いた。
Comparative Example 1 One of the λ / 2 stretched films obtained in Reference Example 1 was used as is.
It was used as a half wave plate.

【0027】比較例2 参考例2で得たλ/4延伸フィルムの1枚をそのまま1
/4波長板として用いた。
Comparative Example 2 One of the λ / 4 stretched films obtained in Reference Example 2 was used as it was.
It was used as a quarter wave plate.

【0028】比較例3 1/4波長板として比較例2で得たものを用いたほかは
実施例4に準じて円偏光板を得た。ただし、1/4波長
板の光軸と偏光フィルムの透過軸の交差角度は45度と
した。
Comparative Example 3 A circularly polarizing plate was obtained in the same manner as in Example 4 except that the one obtained in Comparative Example 2 was used as the 1/4 wavelength plate. However, the crossing angle between the optical axis of the quarter-wave plate and the transmission axis of the polarizing film was 45 degrees.

【0029】評価試験 1/2波長板の広帯域性 実施例1,2、比較例1で得た1/2波長板をクロスニ
コルに配置した偏光板間に配置して分光スペクトルを調
べた。なお、1/2波長板の配置は入射側の偏光板の透
過軸に対して、実施例1ではその2枚のλ/2延伸フィ
ルムの光軸がそれぞれ22.5度と47.5度となるよ
うに、実施例2ではその3枚のλ/2延伸フィルムの光
軸がそれぞれ15度と45度と75度となるように、比
較例1では45度となるようにした。
Evaluation Test Broad band property of 1/2 wavelength plate The 1/2 wavelength plates obtained in Examples 1 and 2 and Comparative Example 1 were placed between polarizing plates arranged in crossed Nicols to examine the spectral spectrum. In addition, the arrangement of the ½ wavelength plate is such that the optical axes of the two λ / 2 stretched films in Example 1 are 22.5 degrees and 47.5 degrees with respect to the transmission axis of the incident side polarizing plate, respectively. As described above, in Example 2, the optical axes of the three λ / 2 stretched films were set to 15 degrees, 45 degrees, and 75 degrees, respectively, and in Comparative Example 1, they were set to 45 degrees.

【0030】前記の結果を図4に示した。これより、ほ
ぼ1/2波長の位相差を与える波長範囲は、比較例1で
は波長550nm付近のみであるのに対し、実施例1,2
では波長450〜700nmの広い範囲に及ぶことがわか
る。
The above results are shown in FIG. From this, the wavelength range that gives a phase difference of approximately ½ wavelength is only in the vicinity of the wavelength of 550 nm in Comparative Example 1, whereas in Examples 1 and 2,
Shows that the wavelength covers a wide range of 450 to 700 nm.

【0031】1/4波長板の広帯域性 実施例3、比較例2で得た1/4波長板をクロスニコル
に配置した偏光板間に配置して分光スペクトルを調べ
た。なお、1/4波長板の配置は入射側の偏光板の透過
軸に対して、実施例3ではその2枚のλ/2延伸フィル
ムの光軸がそれぞれ6.5度と34.2度で、λ/4延
伸フィルムの光軸が100.2度となるように、比較例
2では45度となるようにした。
Broadband property of quarter-wave plate The quarter-wave plate obtained in Example 3 and Comparative Example 2 was placed between polarizing plates arranged in crossed Nicols, and the spectrum was examined. The arrangement of the quarter-wave plate was such that the optical axes of the two λ / 2 stretched films in Example 3 were 6.5 degrees and 34.2 degrees, respectively, with respect to the transmission axis of the incident side polarizing plate. The λ / 4 stretched film had an optical axis of 100.2 degrees, and Comparative Example 2 had an optical axis of 45 degrees.

【0032】前記の結果を図5に示した。これより、ほ
ぼ1/4波長の位相差を与える波長範囲は、比較例2で
は波長550nm付近のみであるのに対し、実施例3では
波長450〜700nmの広い範囲に及ぶことがわかる。
The above results are shown in FIG. From this, it can be seen that the wavelength range that gives a phase difference of approximately ¼ wavelength is only in the vicinity of the wavelength of 550 nm in Comparative Example 2, whereas it extends to a wide range of 450 to 700 nm in Example 3.

【0033】反射防止の広帯域性 実施例4、比較例3で得た円偏光板を光反射板の上に置
き、光の透過状態を調べた。その結果、実施例4では可
視光のすべてが遮光され、黒い状態にあった。一方、比
較例3では青く見え、青系の光に対して遮光効果がなか
った。
Broadband property of antireflection The circularly polarizing plates obtained in Example 4 and Comparative Example 3 were placed on a light reflecting plate, and the light transmission state was examined. As a result, in Example 4, all of the visible light was blocked and it was in a black state. On the other hand, Comparative Example 3 looked blue and had no light-shielding effect on bluish light.

【0034】[0034]

【発明の効果】本発明によれば、波長の変化に伴う位相
差の変化が少ない波長板を得ることができ、広帯域な1
/2波長板、1/4波長板を得ることができる。また、
かかる1/4波長板を用いて可視域等の光の反射をほぼ
防止する広帯域の反射防止フィルターとして有用な円偏
光板を得ることができる。
According to the present invention, it is possible to obtain a wave plate in which the change in the phase difference with the change in the wavelength is small, and the wavelength band is wide.
A half-wave plate and a quarter-wave plate can be obtained. Also,
By using such a quarter-wave plate, a circularly polarizing plate useful as a broadband antireflection filter that substantially prevents reflection of light in the visible range can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例の1/2波長板を例示した断面図。FIG. 1 is a sectional view illustrating a half-wave plate of an example.

【図2】他の実施例の1/4波長板を例示した断面図。FIG. 2 is a cross-sectional view illustrating a quarter wave plate of another embodiment.

【図3】円偏光板を例示した断面図。FIG. 3 is a cross-sectional view illustrating a circularly polarizing plate.

【図4】1/2波長板の分光スペクトルを示したグラ
フ。
FIG. 4 is a graph showing a spectrum of a ½ wavelength plate.

【図5】1/4波長板の分光スペクトルを示したグラ
フ。
FIG. 5 is a graph showing a spectrum of a quarter wave plate.

【符号の説明】[Explanation of symbols]

1,3:1/2波長の位相差を与える延伸フィルム 2:接着層 4:1/4波長の位相差を与える延伸フィルム 5:偏光板 6:1/4波長板 1,3: Stretched film giving a retardation of 1/2 wavelength 2: Adhesive layer 4: Stretched film giving a retardation of 1/4 wavelength 5: Polarizing plate 6: 1/4 wavelength plate

Claims (3)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 単色光に対して1/2波長の位相差を与
    える複数の延伸フィルムをそれらの光軸を交差させて積
    層してなることを特徴とする積層波長板。
    1. A laminated wave plate comprising a plurality of stretched films which give a phase difference of ½ wavelength to monochromatic light and are laminated with their optical axes intersecting each other.
  2. 【請求項2】 複数の延伸フィルムをそれらの光軸を交
    差させて積層してなり、その延伸フィルムが単色光に対
    して1/2波長の位相差を与えるものと、1/4波長の
    位相差を与えるものとの組合せからなることを特徴とす
    る積層波長板。
    2. A plurality of stretched films are laminated with their optical axes intersecting each other, and the stretched film gives a phase difference of ½ wavelength to monochromatic light and a position of ¼ wavelength. A laminated wave plate comprising a combination with a material that gives a phase difference.
  3. 【請求項3】 請求項2に記載の積層波長板と偏光板と
    の積層体からなることを特徴とする円偏光板。
    3. A circularly polarizing plate comprising a laminated body of the laminated wave plate according to claim 2 and a polarizing plate.
JP28717391A 1991-10-07 1991-10-07 Laminated wave plate and circularly polarizing plate Expired - Lifetime JP3174367B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28717391A JP3174367B2 (en) 1991-10-07 1991-10-07 Laminated wave plate and circularly polarizing plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28717391A JP3174367B2 (en) 1991-10-07 1991-10-07 Laminated wave plate and circularly polarizing plate

Publications (2)

Publication Number Publication Date
JPH05100114A true JPH05100114A (en) 1993-04-23
JP3174367B2 JP3174367B2 (en) 2001-06-11

Family

ID=17714026

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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