JPS6132005A - Polarizing filter - Google Patents

Abstract

PURPOSE:To obtain a light polarizing filter having a high degree of polarization by laminating plural prescribed polarizing layers forming a polarizing filter between protective layers. CONSTITUTION:Plural polarizing layers 11, 12 forming a polarizing filter are laminated between protective layers 13, 14 with an adhesive 15-17 in-between so that the axes of polarization coincide with each other. Each of the polarizing layers 11, 12 is formed by dyeing a drawn and oriented polymer film with dichroic coloring matter such as iodine. By the multilayered structure, a high degree of polarization is attained in spite of low density of the coloring matter, and a light polarizing filter having a high degree of polarization and high transmittance is obtd.

Description

【発明の詳細な説明】 ・ぐ技術分野〉 本発明（′：ｉ、二層以上の偏光層を重ね合わせること
により、高透過率て且つ偏光度の大きい偏光フィルタの
作成を可能にしたもので、偏光フィルタの新規な構造に
関するものである１、 〈従来技術〉 従来の偏光フィルタの構成は第３図の様である。[Detailed description of the invention] ・Technical field> The present invention (':i) By overlapping two or more polarizing layers, it is possible to create a polarizing filter with high transmittance and a large degree of polarization. , Concerning a Novel Structure of a Polarizing Filter 1. <Prior Art> The structure of a conventional polarizing filter is as shown in FIG.

図に於いて、１は、延伸配向させた高分子フィルムにヨ
ウ素等の二色性色素を染着させた偏光層、２．３は保護
膜、４，５は接着剤である。この場合、偏光フィルタの
偏光度を上げるには、延伸配向させた高分子フィルムに
染着する二色性色素の濃度を増すことにより達成できる
。しかし、色素濃度が増えるため、単体透過率も小さく
なり、高い偏光度の偏光フィルタはど、暗くなるという
欠点があった。In the figure, 1 is a polarizing layer made by dyeing a stretched and oriented polymer film with a dichroic dye such as iodine, 2.3 is a protective film, and 4 and 5 are adhesives. In this case, increasing the degree of polarization of the polarizing filter can be achieved by increasing the concentration of the dichroic dye dyed on the stretched and oriented polymer film. However, since the dye concentration increases, the single transmittance also decreases, and a polarizing filter with a high degree of polarization becomes dark.

〈発明の目的〉 本発明は上記欠点に鑑みて、偏光度が大きく且つ明るい
偏光フィルタを提供するものである。<Object of the Invention> In view of the above drawbacks, the present invention provides a polarizing filter that has a large degree of polarization and is bright.

〈発明の構成〉 本発明の偏光フィルタは、延伸配向させた高分子フィル
ムにヨウ素等の二色性色素を染着させた偏光層と保護膜
層から成る偏光フィルタに於て、偏光層を同一偏光軸方
向に二層以上重ね合わせたことを特徴とするものである
。このような多層偏光層構造を採用することにより、低
い色素濃度で高い偏光度が得られるものとなり、高透過
率で且つ偏光度の大きい偏光フィルタの作成が可能とな
ったものである。<Structure of the Invention> The polarizing filter of the present invention is composed of a polarizing layer made of a stretched and oriented polymer film dyed with a dichroic dye such as iodine, and a protective film layer, in which the polarizing layers are the same. It is characterized by having two or more layers superimposed in the direction of the polarization axis. By employing such a multilayer polarizing layer structure, a high degree of polarization can be obtained with a low dye concentration, making it possible to create a polarizing filter with high transmittance and a large degree of polarization.

〈実施例〉 本発明による偏光フィルタの構成例を第１図に示す。本
実施例は、偏光層を同一偏光軸方向に二層重ね合わせた
構造を採っている。<Example> An example of the configuration of a polarizing filter according to the present invention is shown in FIG. This embodiment employs a structure in which two polarizing layers are stacked in the same polarization axis direction.

第１図に於て、Ｉ＋、＋２は、延伸配向させた高分子フ
ィルムにヨウ素等の二色性色素を染着させた偏光層、＋
３，１４は保護膜、＋５．ｌ’６゜１７は接着剤である
。In Figure 1, I+ and +2 are polarizing layers made by dyeing dichroic dyes such as iodine on stretched and oriented polymer films;
3 and 14 are protective films, +5. l'6°17 is adhesive.

偏光層として、ＰＶＡ（ポリビニルアルコール）」−ヨ
ウ素系色素を用い、保護膜としてＴＡＣ（トリアセチル
セルロース）を用いた、本発明による偏光フィルタの透
過率特性を第２図に示す。図中、点線は、従来の方法に
よる偏光フィルタの透過率の波長特性（Ｂ）であり、実
線が本発明による偏光フィルタの透過率の波長特性（Ａ
）である。FIG. 2 shows the transmittance characteristics of a polarizing filter according to the present invention, which uses PVA (polyvinyl alcohol)-iodine dye as the polarizing layer and TAC (triacetyl cellulose) as the protective film. In the figure, the dotted line is the wavelength characteristic (B) of the transmittance of the polarizing filter according to the conventional method, and the solid line is the wavelength characteristic (A) of the transmittance of the polarizing filter according to the present invention.
).

第２図から明らかなように、５５０〜７００ｎｍの波伎
域に於て、（Ａ）の平行透過率は（Ｂ）のそれよりも大
きいにもかかわらず、直交透過率は逆に小さくなってお
り、従来品よりも偏光度が優れ、且つ明るい偏光フィル
タが得られた。As is clear from Figure 2, in the wave region of 550 to 700 nm, although the parallel transmittance of (A) is larger than that of (B), the orthogonal transmittance is on the contrary smaller. As a result, a polarizing filter with a superior degree of polarization and brightness compared to conventional products was obtained.

〈発明の効果〉 以上詳細に説明したように、本発明によれば、高透過率
で且つ偏光度の大きい、きわめて有用な偏光フィルタを
得ることができるものである。<Effects of the Invention> As described above in detail, according to the present invention, it is possible to obtain an extremely useful polarizing filter that has high transmittance and a large degree of polarization.

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

第１図は本発明に係る偏光フィルタの構成図、第２図は
本発明に係る偏光フィルタと従来の偏光フィルタの透過
率の波長特性を示す図、第３図は従来の偏光フィルタの
構成図である。 符号の説明 ］：偏光層、２，３：保護膜、４，５：接着剤、ｚ、＋
２：偏光層、１３．１４：保護膜、＋５゜１６．１７：
接着剤。Figure 1 is a block diagram of a polarizing filter according to the present invention, Figure 2 is a diagram showing wavelength characteristics of transmittance of a polarizing filter according to the present invention and a conventional polarizing filter, and Figure 3 is a block diagram of a conventional polarizing filter. It is. Explanation of symbols]: polarizing layer, 2, 3: protective film, 4, 5: adhesive, z, +
2: Polarizing layer, 13.14: Protective film, +5°16.17:
glue.

Claims (1)

【特許請求の範囲】[Claims] １、延伸配向させた高分子フィルムにヨウ素等の二色性
色素を染着させた偏光層と保護膜層から成る偏光フィル
タに於て、偏光層を同一偏光軸方向に二層以上重ね合わ
せたことを特徴とする偏光フィルタ。1. In a polarizing filter consisting of a polarizing layer made by dyeing a stretched and oriented polymer film with a dichroic dye such as iodine and a protective film layer, two or more polarizing layers are stacked in the same polarization axis direction. A polarizing filter characterized by: