JPH0244536A - Optical memory element - Google Patents
Optical memory elementInfo
- Publication number
- JPH0244536A JPH0244536A JP63195268A JP19526888A JPH0244536A JP H0244536 A JPH0244536 A JP H0244536A JP 63195268 A JP63195268 A JP 63195268A JP 19526888 A JP19526888 A JP 19526888A JP H0244536 A JPH0244536 A JP H0244536A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- nematic liquid
- optical rotation
- twisted nematic
- light
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 34
- 239000004988 Nematic liquid crystal Substances 0.000 claims abstract description 14
- 150000001875 compounds Chemical class 0.000 claims description 14
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 27
- 210000002858 crystal cell Anatomy 0.000 abstract description 18
- 239000000758 substrate Substances 0.000 abstract description 13
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000002441 reversible effect Effects 0.000 abstract description 4
- 230000006378 damage Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 9
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 8
- 210000004027 cell Anatomy 0.000 description 7
- 239000011521 glass Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 3
- LGCRPKOHRIXSEG-UHFFFAOYSA-N (4-methoxyphenyl)-phenyldiazene Chemical compound C1=CC(OC)=CC=C1N=NC1=CC=CC=C1 LGCRPKOHRIXSEG-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- -1 acylindigo Chemical compound 0.000 description 2
- DMLAVOWQYNRWNQ-UHFFFAOYSA-N azobenzene Chemical compound C1=CC=CC=C1N=NC1=CC=CC=C1 DMLAVOWQYNRWNQ-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- OPYYWWIJPHKUDZ-UHFFFAOYSA-N phenyl cyclohexanecarboxylate Chemical compound C1CCCCC1C(=O)OC1=CC=CC=C1 OPYYWWIJPHKUDZ-UHFFFAOYSA-N 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- DYLIWHYUXAJDOJ-OWOJBTEDSA-N (e)-4-(6-aminopurin-9-yl)but-2-en-1-ol Chemical compound NC1=NC=NC2=C1N=CN2C\C=C\CO DYLIWHYUXAJDOJ-OWOJBTEDSA-N 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-M Butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 235000000177 Indigofera tinctoria Nutrition 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000004990 Smectic liquid crystal Substances 0.000 description 1
- ZVQOOHYFBIDMTQ-UHFFFAOYSA-N [methyl(oxido){1-[6-(trifluoromethyl)pyridin-3-yl]ethyl}-lambda(6)-sulfanylidene]cyanamide Chemical compound N#CN=S(C)(=O)C(C)C1=CC=C(C(F)(F)F)N=C1 ZVQOOHYFBIDMTQ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229940097275 indigo Drugs 0.000 description 1
- COHYTHOBJLSHDF-UHFFFAOYSA-N indigo powder Natural products N1C2=CC=CC=C2C(=O)C1=C1C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-UHFFFAOYSA-N 0.000 description 1
- 238000006317 isomerization reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000000711 polarimetry Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- JOUDBUYBGJYFFP-FOCLMDBBSA-N thioindigo Chemical compound S\1C2=CC=CC=C2C(=O)C/1=C1/C(=O)C2=CC=CC=C2S1 JOUDBUYBGJYFFP-FOCLMDBBSA-N 0.000 description 1
- ZDPHROOEEOARMN-UHFFFAOYSA-N undecanoic acid Chemical compound CCCCCCCCCCC(O)=O ZDPHROOEEOARMN-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はツィスティッドネマティック液晶にフォトクロ
ミック化合物を溶解分散してなる液晶セルより構成され
、読出しによる記録消失を防止し、かつ高感度に記録を
読出し得る光メモリ素子に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is composed of a liquid crystal cell formed by dissolving and dispersing a photochromic compound in twisted nematic liquid crystal, which prevents the loss of records due to readout, and enables highly sensitive readout of records. This invention relates to optical memory devices.
従来の技術
フォトクロミック化合物は、情報の書込み及び消去を目
的とする可逆的光メモリ材料の構成物質として有用であ
る。しかし、光反応にはしきい値がないため読出し光の
繰り返し照射により、書込まれた情報は、少しづつ消失
する。この欠点を克服する手段として、旋光度が吸収帯
から離れた波長域でも検出可能である性質を利用し、フ
ォトクロミズムの化学構造変化を旋光度の変化に変換し
検出する工夫がなされている。例えば、フォトクロミッ
ク化合物を分散する媒体として高分子コレステリック液
晶を用いた光メモリ材料がこれまでに提案されている（
特開昭６２−２０９１８６＞。BACKGROUND OF THE INVENTION Photochromic compounds are useful as constituents of reversible optical memory materials for the purpose of writing and erasing information. However, since there is no threshold for photoreaction, the written information gradually disappears due to repeated irradiation with readout light. As a means to overcome this drawback, efforts have been made to utilize the property that optical rotation can be detected even in a wavelength range far from the absorption band, and to convert and detect changes in the chemical structure of photochromism into changes in optical rotation. For example, optical memory materials that use polymeric cholesteric liquid crystal as a medium for dispersing photochromic compounds have been proposed (
JP-A-62-209186>.
これは、コレステリック液晶が持つ螺旋構造体のなかに
フォトクロミック分子が溶解分散することによって、螺
旋構造体によって７オトクロミツク分子に旋光度が誘起
されることを原理としている。This is based on the principle that when photochromic molecules are dissolved and dispersed in the helical structure of the cholesteric liquid crystal, optical rotation is induced in the 7-otochromic molecules by the helical structure.
従って、旋光度変化はコレステリック液晶相の持つ大き
な旋光度にフォトクロミズムによって生ずる旋光度変化
が上乗せされた形で検知されるが、この螺旋構造に基づ
く旋光度はフォトクロミズムに伴う旋光度変化に対し著
しく大きいため、ピッチ長を精度高く設定する必要があ
った。しかしながら、ピッチ長は、液晶セルの構成条件
、液晶相発現条件、温度などによって影響されることが
多いため、このようなコレステリック液晶をマトリック
スとした光メモリ材料は試料間で旋光度のバラツキが有
り、旋光度を正確かつ高感度に検出するには問題があっ
た。Therefore, the change in optical rotation is detected as a combination of the large optical rotation of the cholesteric liquid crystal phase and the change in optical rotation caused by photochromism, but the optical rotation based on this helical structure is significantly larger than the change in optical rotation caused by photochromism. Therefore, it was necessary to set the pitch length with high precision. However, since the pitch length is often influenced by the configuration conditions of the liquid crystal cell, the conditions for liquid crystal phase development, temperature, etc., optical memory materials using such cholesteric liquid crystal as a matrix have variations in optical rotation between samples. There were problems in detecting optical rotation accurately and with high sensitivity.
発明が解決しようとする課題
本発明は、従来のフォトクロミズムを利用した可逆的光
記録の持つ欠点を改良し、読出し光による記録破壊がな
く、而も高感度に記録情報を検出できる新規光メモリ素
子を提供するものである。Problems to be Solved by the Invention The present invention improves the drawbacks of conventional reversible optical recording using photochromism, and provides a new optical memory element that does not cause record destruction due to readout light and can detect recorded information with high sensitivity. This is what we provide.
課題を解決するための手段
本発明者らは、読出し光による記録消失を防止し、かつ
高感度に記録を読み出せる光メモリ材料を開発するため
に、鋭意研究を重ねた結果、ツィスティッドネマティッ
ク液晶相はコレステリック液晶相の螺旋構造の部分構造
に相当し、しかも、その螺旋構造は平行配向処理を施し
た二枚の基板の配向処理方向の角度を設定することによ
り、任意に設定される事実（例えば、配向処理方向を直
交するように二枚の基板を用いると液晶相は、四分の−
の螺旋構造を持ち、９０度の旋光度を持つことになる）
に着目し、コレステリック液晶の代りにツィスティッド
ネマティック液晶を用いれば、旋光度が一定であり、液
晶セルのバラツキを解決できること及びフォトクロミズ
ムに伴う旋光度変化量が大きい事実を見出し、この知見
に基づいて、本発明をなすに至った。Means for Solving the Problems The present inventors have conducted intensive research to develop an optical memory material that can prevent recording erasure due to readout light and can read records with high sensitivity. corresponds to a partial structure of the helical structure of the cholesteric liquid crystal phase, and the fact that the helical structure can be arbitrarily set by setting the angle of the alignment treatment direction of two substrates subjected to parallel alignment treatment (for example, , when two substrates are used so that the orientation treatment directions are perpendicular, the liquid crystal phase is divided into four parts.
It has a helical structure and an optical rotation of 90 degrees)
Based on this knowledge, we focused on the fact that by using twisted nematic liquid crystal instead of cholesteric liquid crystal, the optical rotation is constant, and it is possible to solve the variation in liquid crystal cells, and the amount of change in optical rotation due to photochromism is large. , the present invention was accomplished.
すなわち、本発明は、液晶セルを構成している二枚の透
明基板の間でネマティック液晶相が捻れているツィステ
ィッドネマティック液晶中にフォトクロミック化合物を
溶解せしめ、フォトクロミック化合物の可逆的光反応に
伴う構造変化をツィスティッドネマティック液晶セルの
旋光度変化に変換して読出し得る光メモリ素子を提供す
るものである。That is, the present invention dissolves a photochromic compound in a twisted nematic liquid crystal in which a nematic liquid crystal phase is twisted between two transparent substrates constituting a liquid crystal cell, and forms a structure accompanying a reversible photoreaction of the photochromic compound. The object of the present invention is to provide an optical memory element capable of converting a change into a change in optical rotation of a twisted nematic liquid crystal cell and reading it out.
本発明で用いる液晶セル基板には、透明なシリカガラス
、硬質ガラス、石英ガラス及び透明な各種高分子シート
が用いられる。本発明では、上記の基板をあらかじめ公
知の方法で配向処理をおこなう必要がある（松本圧−１
角田市良著「液晶の最新技術−物性・マテリアル・応用
−」工業調査会、１９８４年 参照）。すなわち、これ
らの基板を斜め蒸着法で処理したり、あるいは、ポリビ
ニルアルコールあるいはポリイミド薄膜を塗布し、これ
を綿布で軽く擦る方法、ラビングを行う。For the liquid crystal cell substrate used in the present invention, transparent silica glass, hard glass, quartz glass, and various transparent polymer sheets are used. In the present invention, it is necessary to orient the above-mentioned substrate in advance by a known method (Matsumoto Pressure-1
(Refer to Ichiyoshi Tsunoda, "Latest Technology of Liquid Crystals - Physical Properties, Materials, Applications," Industrial Research Association, 1984). That is, these substrates are treated with an oblique vapor deposition method, or a thin film of polyvinyl alcohol or polyimide is applied and rubbed lightly with a cotton cloth.
本発明においては、この配向処理基板上にフォトクロミ
ック化合物を溶解した液晶化合物物をのせ、さらにこの
上にもう一枚の配向処理基板をのせる。この時、二枚の
配向基板の配向方向が一定の角度、例えば、９０度にな
るように液晶セルを構成する必要がある。液晶セルの厚
みを調製するために、高分子微粒子やガラスロッドなど
のスペーサを用いることができる。あるいは、また表示
用液晶セルの製造と同じく熱硬化性樹脂、光硬化性エポ
キシ樹脂などを用いてシールされた空セル容器に液晶を
充填することを利用出来る（前述文献参照）。In the present invention, a liquid crystal compound in which a photochromic compound is dissolved is placed on this alignment-treated substrate, and another alignment-treated substrate is placed on top of this. At this time, it is necessary to configure the liquid crystal cell so that the alignment directions of the two alignment substrates are at a certain angle, for example, 90 degrees. In order to adjust the thickness of the liquid crystal cell, spacers such as polymer particles or glass rods can be used. Alternatively, it is also possible to fill an empty cell container sealed with a thermosetting resin, photocurable epoxy resin, etc. with liquid crystal, as in the production of display liquid crystal cells (see the above-mentioned literature).
ここで言うフォトクロミック化合物とは光幾何異性化に
基づく、アゾベンゼン、インジゴ、アシルインジゴ、チ
オインジゴ、セレノインジゴ、ベリナフトインジゴ、ヘ
ミチオインジゴ、インドリノスピロベンゾピラン、ペン
ゾチアゾリノスピロペンゾピランなどを基本骨格とする
化合物をさす。The photochromic compounds referred to here are based on photogeometric isomerization, such as azobenzene, indigo, acylindigo, thioindigo, selenoindigo, berinaphthoindigo, hemitioindigo, indolinospirobenzopyran, penzothiazolinospiropenzopyran, etc. Refers to a compound that serves as a skeleton.
また、液晶としては、従来知られているネマティック系
の液晶物質から任意に選ぶことが出来る（ Ａ 、
Ｂｇｇｕｉｎ ｅｔ ａｌ、 Ｍｏ１ｅｃｕｌａ
ｒ Ｃｒｙｓｔａｌｓ ａｎｄＬｉｑｕｉｄ Ｃｒ
ｙｓｔａｌｓ、 Ｖｏｌ、 １１５． Ｎｏ、 １−４
． （１９８４）参照）。また、スメクティック系のも
のであっても、ある温度でネマティック液晶相をとるも
のを用いることが出来る。液晶物質としては低分子のみ
ならず高分子のものも含まれることは言うまでもない。In addition, the liquid crystal can be arbitrarily selected from conventionally known nematic liquid crystal materials (A,
Bgguin et al, Molecula
r Crystals and Liquid Cr
ystals, Vol, 115. No. 1-4
．． (1984)). Furthermore, even if it is a smectic material, one that takes a nematic liquid crystal phase at a certain temperature can be used. It goes without saying that liquid crystal substances include not only low molecular weight substances but also high molecular weight substances.
本発明においては、これらの液晶材料を配向基板の配向
処理方向を一定の角度、例えば直交させることにより液
晶分子に捻りを加え、ツィスティラドネマティックの状
態として使用することが必要である。とくに、配向処理
方向を直交させた場合、ねじれ方向を右まわりもしくは
左まわりに設定するために、液晶化合物に光学活性物質
を添加してもよいし、あるいは、フォトクロミック化合
物自体が光学活性体であっても良い。In the present invention, it is necessary to use these liquid crystal materials in a twisty-rad nematic state by twisting the liquid crystal molecules by aligning the alignment direction of the alignment substrate at a certain angle, for example, perpendicularly. In particular, when the orientation treatment directions are orthogonal, an optically active substance may be added to the liquid crystal compound in order to set the twist direction clockwise or counterclockwise, or the photochromic compound itself may be an optically active substance. It's okay.
フォトクロミック化合物の添加量は、液晶の重量当り０
．１〜１０重量％、好ましくは０．５〜５重世％の範囲
である。The amount of photochromic compound added is 0 per weight of liquid crystal.
．． It ranges from 1 to 10% by weight, preferably from 0.5 to 5% by weight.
液晶セルの厚みは、２〜５０ミクロンの任意の厚みを選
ぶことができる。さらには、このように調製した液晶セ
ルに複屈折板を重ねることによって、旋光度変化量をさ
らに増大させることも可能である。The thickness of the liquid crystal cell can be arbitrarily selected from 2 to 50 microns. Furthermore, by stacking a birefringent plate on the liquid crystal cell prepared in this way, it is possible to further increase the amount of change in the optical rotation.
発明の効果
本発明の光メモリ材料においては、情報の読出しは光書
込みによって生ずる旋光度の変化、すなわち、直線偏光
の回転角度の変化を測定することによってなされる。直
線偏光の波長はフォトクロミズムで用いる波長領域を超
えたものでもよいので光続出しによる記録の消失を防止
でき、かつその変化量は、フォトクロミック化合物の種
類とそのドープ量、セル厚、光反応量、旋光度測定波長
によって異なるが、セル１ミリ厚に換算すると、１５０
〜２０００度もあり、コレステリック液晶を用いた系の
約３〜９００倍の変化量として捕えることが可能であり
、メモリ検出が高感度に出来る。Effects of the Invention In the optical memory material of the present invention, information is read by measuring the change in optical rotation caused by optical writing, that is, the change in the rotation angle of linearly polarized light. The wavelength of the linearly polarized light may exceed the wavelength range used in photochromism, so it is possible to prevent the loss of recording due to continuous light emission, and the amount of change depends on the type of photochromic compound, its doping amount, cell thickness, amount of photoreaction, It varies depending on the optical rotation measurement wavelength, but when converted to a cell thickness of 1 mm, it is 150
~2000 degrees, making it possible to capture changes approximately 3 to 900 times greater than in a system using cholesteric liquid crystals, allowing for highly sensitive memory detection.
次に実施例によって本発明をさらに詳細に説明する。Next, the present invention will be explained in more detail with reference to Examples.
実施例 １
シクロヘキサンカルボン酸フェニルエステルの混合液晶
１００ｍｇに、４−メトキシアゾベンゼン１ｍｇ及び８
ミクロンのガラススペーサーを入れ良く混合する。この
混合物をラビング配向処理した硬質ガラス基板上に流し
、さらにこの上にもう一枚の配向処理済の基板を、ラビ
ング方向が直交するようにのせ、ツィスティッドネマテ
ィック液晶セルを得た。このセルに５００ｗの超高圧水
銀燭と色ガラスフィルターとを組み合せて取り出した３
６５ｎｍの紫外光を２０秒間照射した。アゾベンゼン誘
導体のトランス体からシス体への変化につれ、旋光度（
５８９ｎｍ）が−８８，０度から−８５，０度に変化し
た。５８９ｎｍの光ではシス体がトランス体に変するこ
とはないが、この状態で＞４４０ ｎｍ以上の可視光を
照射すると、旋光度は、再び一８８度にもどった。以後
、紫外光と可視光の交互照射により、旋光度は一８８度
と８５度の間を可逆的に変化した。この変化量は、液晶
セル１ミリ当りに換算すると、１５０度の変化量になる
。Example 1 To 100 mg of mixed liquid crystal of cyclohexanecarboxylic acid phenyl ester, 1 mg of 4-methoxyazobenzene and 8
Add a micron glass spacer and mix well. This mixture was poured onto a hard glass substrate that had been subjected to a rubbing alignment treatment, and another substrate that had been subjected to an alignment treatment was placed thereon so that the rubbing directions were perpendicular to each other, to obtain a twisted nematic liquid crystal cell. This cell was combined with a 500W ultra-high pressure mercury candle and a colored glass filter.
It was irradiated with 65 nm ultraviolet light for 20 seconds. As the azobenzene derivative changes from the trans form to the cis form, the optical rotation (
589 nm) changed from -88.0 degrees to -85.0 degrees. Although the cis isomer does not change to the trans isomer with light of 589 nm, when visible light of >440 nm or more is irradiated in this state, the optical rotation returns to 188 degrees. Thereafter, the optical rotation was reversibly changed between 188 degrees and 85 degrees by alternate irradiation with ultraviolet light and visible light. This amount of change is equivalent to 150 degrees per millimeter of liquid crystal cell.
実施例 ２
実施例１における４−メトキシアゾベンゼンの代りに（
ｓ）−４−（２−メチルブトキシ）−４ペンチルアゾベ
ンゼンを液晶の重量当り、３重量％溶解し、２０ミクロ
ンのツィスティッドネマティック液晶セルをえた。この
セルに紫外光と可視光との交互照射すると、５８９ｎｍ
の旋光度が８７度と４７度の間で可逆的に変化した。こ
の変化量は、液晶セル１ミリ当りに換算すると２０００
度になる。Example 2 Instead of 4-methoxyazobenzene in Example 1, (
s)-4-(2-Methylbutoxy)-4pentylazobenzene was dissolved in an amount of 3% by weight based on the weight of the liquid crystal to obtain a 20 micron twisted nematic liquid crystal cell. When this cell is alternately irradiated with ultraviolet light and visible light, 589 nm
The optical rotation of was reversibly changed between 87 degrees and 47 degrees. This amount of change is converted to 2000 per millimeter of liquid crystal cell.
It becomes degree.
比較例
実施例１におけるシクロへキシルカルボン酸フェニルエ
ステルの混合液晶の代りにコレステリル−４−（メタシ
クロイロキシ）ブタノエートとコレステリル−１ｌ−（
メタシクロイロキシ）ウンデカノエートとの共重合体を
もちい、８ミクロンの高分子コレステリック液晶セルを
構成した。このセルに実施例１で用いた紫外光及び可視
光を交互照射すると、５８９ｎｍの旋光度が−２，４９
５度から−２，４８２度の間で可逆的に変化した。Comparative Example Instead of the mixed liquid crystal of cyclohexylcarboxylic acid phenyl ester in Example 1, cholesteryl-4-(metacycloyloxy)butanoate and cholesteryl-1l-(
An 8 micron polymer cholesteric liquid crystal cell was constructed using a copolymer with (metacycloyloxy) undecanoate. When this cell was alternately irradiated with the ultraviolet light and visible light used in Example 1, the optical rotation at 589 nm was -2.49
It changed reversibly between 5 degrees and -2,482 degrees.
この変化量は、セル１ミリ当りに検算すると０゜１６３
度になる。This amount of change is 0°163 per millimeter of cell.
It becomes degree.
Claims (1)
光により可逆的に分子構造変化を行うフォトクロミック
化合物を溶解分散してなる光メモリ素子1. Optical memory element made by dissolving and dispersing a photochromic compound that reversibly changes its molecular structure when exposed to light of different wavelengths in a twisted nematic liquid crystal phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63195268A JPH0244536A (en) | 1988-08-04 | 1988-08-04 | Optical memory element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63195268A JPH0244536A (en) | 1988-08-04 | 1988-08-04 | Optical memory element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0244536A true JPH0244536A (en) | 1990-02-14 |
| JPH0444331B2 JPH0444331B2 (en) | 1992-07-21 |
Family
ID=16338329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63195268A Granted JPH0244536A (en) | 1988-08-04 | 1988-08-04 | Optical memory element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0244536A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01246538A (en) * | 1988-03-28 | 1989-10-02 | Mitsui Petrochem Ind Ltd | Optical recording medium |
-
1988
- 1988-08-04 JP JP63195268A patent/JPH0244536A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01246538A (en) * | 1988-03-28 | 1989-10-02 | Mitsui Petrochem Ind Ltd | Optical recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0444331B2 (en) | 1992-07-21 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |