JPS62167089A - Laser recording medium - Google Patents
Laser recording mediumInfo
- Publication number
- JPS62167089A JPS62167089A JP61009461A JP946186A JPS62167089A JP S62167089 A JPS62167089 A JP S62167089A JP 61009461 A JP61009461 A JP 61009461A JP 946186 A JP946186 A JP 946186A JP S62167089 A JPS62167089 A JP S62167089A
- Authority
- JP
- Japan
- Prior art keywords
- film
- recording
- recording medium
- laser
- recording layer
- 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
- 239000000126 substance Substances 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 7
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 150000001875 compounds Chemical class 0.000 claims abstract description 4
- 238000010521 absorption reaction Methods 0.000 claims description 14
- 230000001186 cumulative effect Effects 0.000 claims description 10
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims 1
- HPEUJPJOZXNMSJ-UHFFFAOYSA-N Methyl stearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC HPEUJPJOZXNMSJ-UHFFFAOYSA-N 0.000 abstract description 6
- REZZEXDLIUJMMS-UHFFFAOYSA-M dimethyldioctadecylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCCCC REZZEXDLIUJMMS-UHFFFAOYSA-M 0.000 abstract description 5
- 239000011521 glass Substances 0.000 abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 abstract 2
- 238000004040 coloring Methods 0.000 abstract 1
- CAMHHLOGFDZBBG-UHFFFAOYSA-N epoxidized methyl oleate Natural products CCCCCCCCC1OC1CCCCCCCC(=O)OC CAMHHLOGFDZBBG-UHFFFAOYSA-N 0.000 abstract 1
- 239000011877 solvent mixture Substances 0.000 abstract 1
- 239000000975 dye Substances 0.000 description 15
- 239000010410 layer Substances 0.000 description 14
- 238000002835 absorbance Methods 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Thermal Transfer Or Thermal Recording In General (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〕
本発明はレーザ記録媒体に関し、更に詳細には繰り返し
記録・消去の可能なレーザ記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a laser recording medium, and more particularly to a laser recording medium that can be repeatedly recorded and erased.
Ｃ発明の１既要〕
本発明は、有機色素を成ｎ々物質と共にＪ−会合帯の累
積膜とした記録層を有するレーザ記録媒体において、
成膜物質として特定の化合物を用いて累積膜が形成され
ていることにより、
繰り返し記録・消去ができるようにしたものである。C1 Summary of the Invention] The present invention provides a laser recording medium having a recording layer in which an organic dye is formed into a cumulative film of J-association zones together with various substances, in which the cumulative film is formed using a specific compound as a film-forming substance. This makes it possible to record and erase repeatedly.
〔従巣の技術及び発明が解決しようとする問題点〕有機
色素分子、例えばシアニン色素分子は水溶液中での色素
分子の濃度が高くなると、色素の単分子による吸収帯及
びこれより短波長側の二量体吸収帯と多分子会合体吸収
帯の外に、単分子吸収帯より長波長側に吸収強度が大き
く、半値幅の非常に狭い吸収帯をもつ。この吸収帯はＪ
−吸収帯と呼ばれ、Ｊ−会合体と呼ばれる色素分子の集
合状態に属することが知られている。このＪ−会合体は
レーザ光の熱で集合状態が変化し、それに伴って光吸収
スペクトルが変化する。この変化に着目して、Ｊ−会合
体の累積膜を記録層に利用したレーザ記録媒体が試作さ
れている。[Problems to be solved by the technology and invention of Junsu] When the concentration of organic dye molecules, such as cyanine dye molecules, increases in an aqueous solution, the absorption band of the single molecule of the dye and the wavelength side shorter than this increase. In addition to the dimer absorption band and the multimolecular association absorption band, there is an absorption band with a larger absorption intensity on the longer wavelength side than the single molecule absorption band and a very narrow half-width. This absorption band is J
- It is called an absorption band and is known to belong to an aggregated state of dye molecules called a J-aggregate. The aggregate state of this J-aggregate changes due to the heat of the laser beam, and the light absorption spectrum changes accordingly. Focusing on this change, a laser recording medium using a cumulative film of J-aggregates as a recording layer has been prototyped.
Ｊ−会合体累積膜の形成はラングミュア・ブロジェット
法により次の通り行われる。The J-aggregate cumulative film is formed by the Langmuir-Blodgett method as follows.
まず、を機色素と成膜物質とを有機溶媒に溶解し、水槽
の水面に滴下、展開して単分子膜を得る。First, a dye and a film-forming substance are dissolved in an organic solvent, and the solution is dropped onto the water surface of an aquarium and spread to obtain a monomolecular film.
次にこの単分子膜を一定表面圧下で圧縮しながら、水面
を垂直に横切る基板を繰返し所望回数上下動させてこれ
に移し採る。こうして、色素分子が配向、配列して特殊
な集合状態のＪ−会合体累積膜が形成される。この際、
有機色素としてシアニン色素を使用し、成膜物質として
ステアリルアミンとステアリン酸メチルエステルとを併
用することが考えられている。こうして得られたＪ−会
合体累積膜を記録層として有するレーザ記録媒体は、記
録時に記録ピットからの色素の離散を伴わないため、繰
り返し記録・消去の可能な記録媒体となり得るが、前記
２種の成膜物質を併用して得られたＪ−会合体累積膜で
は、一度崩壊した後の再生現象がまだ観測されていない
。Next, while compressing this monomolecular film under a constant surface pressure, it is transferred onto a substrate that vertically crosses the water surface by repeatedly moving it up and down a desired number of times. In this way, the dye molecules are oriented and arranged to form a cumulative film of J-aggregates in a special state of assembly. On this occasion,
It has been considered to use cyanine dye as the organic dye and to use stearylamine and stearic acid methyl ester together as the film forming substance. A laser recording medium having the thus obtained J-aggregate cumulative film as a recording layer does not involve dispersion of the dye from the recording pits during recording, so it can be a recording medium that can be repeatedly recorded and erased. In the J-aggregate cumulative film obtained by using the above film-forming materials in combination, a regeneration phenomenon after once disintegrating has not yet been observed.
本発明者らはＪ−会合体累積膜の形成に使用される成膜
物質を検討した結果、Ｊ−会合体に崩壊・再生（即ち、
記録・消去）の可逆的な変化を可能とする成膜物質を見
出し、本発明を完成するに至った。The present inventors investigated the film-forming materials used to form the J-aggregate cumulative film, and found that the J-aggregates are broken down and regenerated (i.e.,
The present inventors have discovered a film-forming material that enables reversible changes in recording and erasing (recording and erasing), and have completed the present invention.
本発明は、基板上に反射膜と記録膜とが順次積層されて
なり、前記記録層が、レーザの発振波長域に吸収帯をも
つ有機色素を成膜物質と共にラングミュア・ブロジェッ
ト法によりＪ−会合帯の累積膜とした層であるレーザ記
録媒体において、前記有機色素が式（Ｔ）
で表わされるシアニン色素であり、
前記成膜物質が一般式（ｎ）
（式中Ｒ８及びＲ２はそれぞれ炭素数１４〜２０の直鎖
アルキル基、Ｒ３及びＲ４はそれぞれＨ１ＣＩ＋３又は
ＣＪｓ、ＸはＣ１％ Ｂｒ又は１である）で表わされる
化合物を少なくとも含むレーザ記録媒体に係るものであ
る。In the present invention, a reflective film and a recording film are sequentially laminated on a substrate, and the recording layer is formed by applying a J-layer film using the Langmuir-Blodgett method together with an organic dye having an absorption band in the oscillation wavelength range of a laser. In a laser recording medium that is a layer formed as a cumulative film of association zones, the organic dye is a cyanine dye represented by the formula (T), and the film-forming substance is a cyanine dye represented by the general formula (n) (wherein R8 and R2 each represent carbon The present invention relates to a laser recording medium containing at least a compound represented by 14 to 20 straight chain alkyl groups, R3 and R4 are each H1CI+3 or CJs, and X is C1% Br or 1.
前記基板として例えば、ガラス基板を用いることができ
る。For example, a glass substrate can be used as the substrate.
また、前記一般式（ＩＩ）で表わされる成膜物質として
例えば、ジオクタデシルジメチルアンモニウムクロライ
ド（ＤＯＤＡＣ）を用いることができ、この成膜物質は
他の成膜物質、例えばステアリン酸メチルエステル（Ｓ
ｔＭＥ）と併用することが好ましい。Further, as the film-forming substance represented by the general formula (II), for example, dioctadecyldimethylammonium chloride (DODAC) can be used, and this film-forming substance can be used in combination with other film-forming substances, such as stearic acid methyl ester (S
It is preferable to use it in combination with tME).
本発明のレーザ記録媒体は、レーザ光照射によりＪ−会
合体の崩壊（記録）が行われた後、適当な温度と湿度の
条件下（例えば、２５〜３５℃、６０％ＲＨ以上、好ま
しくは９０〜１００％ＲＨ）で１０時間以上温装（イン
キュベーション）することにより、Ｊ−会合体が再生（
消去）され、この記録・消去は繰り返し行うことができ
る。The laser recording medium of the present invention is produced under appropriate temperature and humidity conditions (for example, 25 to 35°C, 60% RH or higher, preferably J-aggregates are regenerated (incubated) at 90-100% RH for 10 hours or more.
This recording/erasing can be repeated.
以下本発明の実施例を図面につき説明する。 Embodiments of the present invention will be described below with reference to the drawings.
前記式（■）で表わされるシアニン色素とＤＯＤＡＣと
ＳｔＭＥとを１：１：２（モル比）の割合でクロロホル
ム／メタノール（４：ｌ）の混合溶媒に溶解し、ＤＯＤ
ＡＣとＳｔＭＥとを合せた濃度がｌ ｍｇ／ｍｌ とな
るように８周整した。このン容液を２０℃の蒸留水の水
面に滴下して単分子膜を展開した後、水面の仕切りを動
かして表面圧が３５ｄｙｎｅ／ｃ＋＋＋になるまで圧縮
した。この屯分子膜をラングミュア・ブロジェット法で
第１図に示すように約２０００人のアルミ製反射膜２の
付いたガラス製基板１に２５層累積して厚さ約８００人
の記録層３を形成した。DOD
Eight cycles were carried out so that the combined concentration of AC and StME was 1 mg/ml. After this liquid was dropped onto the surface of distilled water at 20° C. to develop a monomolecular film, a partition on the water surface was moved to compress the film until the surface pressure reached 35 dyne/c+++. Using the Langmuir-Blodgett method, 25 layers of this monolayer film were accumulated on a glass substrate 1 with an aluminum reflective film 2 of about 2,000 layers, as shown in FIG. 1, to form a recording layer 3 of about 800 layers. Formed.
こうして作製した記録媒体試料の反射吸収スペクトルを
第２図に実線で示す。約８００ｎｍにある吸収ピークは
シアニン色素のＪ−会合体の集合状態に属するＪ−吸収
帯である。この試料に記録層２側からフラッシュ光を照
射して瞬間的に加熱すると、Ｊ−会合体の集合状態が乱
されるため、第２図中に一点鎖線で示したように約ａｏ
ｏｎｍにあるＪ−吸収帯が減少し、約６６０ ｎｍのモ
ノマービークが増大する。The reflection/absorption spectrum of the recording medium sample thus prepared is shown in FIG. 2 by a solid line. The absorption peak at about 800 nm is a J-absorption band belonging to the assembled state of J-aggregates of cyanine dyes. When this sample is instantaneously heated by irradiating flash light from the side of the recording layer 2, the aggregation state of the J-aggregates is disturbed, so that approximately ao
The J-absorption band at onm is reduced and the monomer peak at about 660 nm is increased.
次に、フラッシュ光照射を行った前記試料を温度３０℃
、温度約１００％ＲＨの条件で２４時間温置した後、再
び反射吸収スペクトルを測定し、第２図に点線で示した
結果を得た。これらの結果から、Ｊ−吸収帯の再生と七
ツマーピーク（約６６０ｎｍ）の減少が同時に起きてい
ることがわかる。Next, the sample subjected to flash light irradiation was heated to 30°C.
After incubation for 24 hours at a temperature of about 100% RH, the reflection absorption spectrum was measured again, and the results shown by the dotted line in FIG. 2 were obtained. From these results, it can be seen that the regeneration of the J-absorption band and the decrease of the 7-mer peak (approximately 660 nm) occur simultaneously.
前記のフラッシュ光照射（記録）及び温度（消去）を繰
り返し行い、毎回の吸光度を測定し、その結果を第３図
に示した。第３図は本発明のレーザ記録媒体がすぐれた
記録と消去の繰り返し特性を有することを示している。The above flash light irradiation (recording) and temperature (erasing) were repeated, and the absorbance was measured each time. The results are shown in FIG. FIG. 3 shows that the laser recording medium of the present invention has excellent repeatability of recording and erasing.
なお、本実施例において、レーザ光照射の代わりにフラ
ッシュ光照射を用いて記録を行ったのは、レーザ光のス
ポット径が小さく （１，２０μｍ程度）、レーザ光
照射一温度による繰り返し記録・消去を行った際の反射
吸光度の変化の測定が極めて困難なためである。しかし
、フラッシュ光照射とレーザ光照射のいずれによっても
、本実施例のレーザ記録媒体の反射吸収スペクトルの変
化は同しであることを確認している。Note that in this example, recording was performed using flash light irradiation instead of laser light irradiation because the spot diameter of the laser light was small (about 1.20 μm), and repeated recording and erasing was performed depending on the laser light irradiation temperature. This is because it is extremely difficult to measure changes in reflected absorbance when performing this process. However, it has been confirmed that the change in the reflection and absorption spectrum of the laser recording medium of this example is the same regardless of whether it is irradiated with flash light or laser light.
さらに、本実施例の記録媒体にレーザ光を照射して記録
層に生した暗いスポット（記録部分）は、温度により消
滅する（即ち消去される）ことを顕微鏡による肉眼観察
で確認した。Furthermore, it was confirmed by visual observation using a microscope that the dark spots (recorded portions) produced in the recording layer by irradiating the recording medium of this example with laser light disappeared (that is, were erased) by temperature.
本発明のレーザ記録媒体はｊδ当な温度及び湿度の条件
下で温度（インキュベーション）すると、レーザ光照射
（記録）による集合状態の変化（崩壊）した記１．工層
のＪ−会合帯が再生し、即ち記録を消去することができ
、この記録・消去は繰り返し行うことができる。このた
め、レーザ記′Ｌ；Ａ媒体の汎用性をさらに拡大させる
ことができる。When the laser recording medium of the present invention is heated (incubated) under conditions of temperature and humidity equivalent to jδ, the state of aggregation changes (disintegrates) due to laser beam irradiation (recording).1. The J-association zone of the strata can be regenerated, that is, the recording can be erased, and this recording and erasure can be repeated. Therefore, the versatility of the laser recording medium can be further expanded.
レーザ光照射により崩壊したＪ−会合帯の再生現象は約
３０゛Ｃで６０％Ｒ０未満では認められず、６０％ＲＨ
以上、好ましくは９０〜１００％ＲＩ−（で認められる
ことから、崩壊したＪ−会合体の再生は水分子の会合体
へ及ぼす正の影響（再配列の促進）が主要因となってい
ると考えらる。The regeneration phenomenon of the J-association zone collapsed by laser beam irradiation is not observed at approximately 30°C and less than 60% R0, and at 60% RH.
As mentioned above, since it is preferably observed at 90-100% RI-( I can think about it.
第１図は実施例の断面図、第２図は実施例の記録媒体の
記録層の吸光度変化のグラフ、第３図は実施例の記録媒
体の繰り返し記録・消去時の吸光度変化のグラフである
。
なお、図面に用いた符号において、
１−−−−・−−−−−−−−一−基板２−−−−一反
射層
３−−−−−−−−−−−−−一記録層である。FIG. 1 is a cross-sectional view of the example, FIG. 2 is a graph of the absorbance change of the recording layer of the recording medium of the example, and FIG. 3 is a graph of the absorbance change during repeated recording and erasing of the recording medium of the example. . In addition, in the symbols used in the drawings, 1-----・----------------------------------------------------------------- It is a layer.
Claims (1)
記録層が、レーザの発振波長域に吸収帯をもつ有機色素
を成膜物質と共にラングミュア・ブロジェット法により
Ｊ−会合体の累積膜とした層であるレーザ記録媒体にお
いて、 前記有機色素が式 ▲数式、化学式、表等があります▼ で表わされるシアニン色素であり、 前記成膜物質が一般式 ▲数式、化学式、表等があります▼ （式中Ｒ＿１及びＲ＿２はそれぞれ炭素数１４〜２０の
直鎖アルキル基、Ｒ＿３及びＲ＿４はそれぞれＨ、ＣＨ
＿３又はＣ＿２Ｈ＿５、ＸはＣｌ、Ｂｒ又はＩである）
で表わされる化合物を少なくとも含むレーザ記録媒体。[Claims] A reflective film and a recording film are sequentially laminated on a substrate, and the recording layer is formed using a Langmuir-Blodgett method together with an organic dye having an absorption band in the oscillation wavelength range of the laser. In a laser recording medium which is a layer formed of a cumulative film of J-aggregates, the organic dye is a cyanine dye represented by the formula ▲There are mathematical formulas, chemical formulas, tables, etc.▼, and the film-forming substance is a general formula ▲mathematical formula, There are chemical formulas, tables, etc.▼ (In the formula, R_1 and R_2 are linear alkyl groups each having 14 to 20 carbon atoms, R_3 and R_4 are H and CH, respectively.
_3 or C_2H_5, X is Cl, Br or I)
A laser recording medium comprising at least a compound represented by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61009461A JPH0720729B2 (en) | 1986-01-20 | 1986-01-20 | Laser recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61009461A JPH0720729B2 (en) | 1986-01-20 | 1986-01-20 | Laser recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62167089A true JPS62167089A (en) | 1987-07-23 |
| JPH0720729B2 JPH0720729B2 (en) | 1995-03-08 |
Family
ID=11720922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61009461A Expired - Fee Related JPH0720729B2 (en) | 1986-01-20 | 1986-01-20 | Laser recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0720729B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0321923A2 (en) * | 1987-12-21 | 1989-06-28 | EASTMAN KODAK COMPANY (a New Jersey corporation) | Infrared absorbing cyanine dyes for dye-donor element used in laser-induced thermal dye transfer |
| JPH0289683A (en) * | 1988-09-27 | 1990-03-29 | Fuji Photo Film Co Ltd | Information recording medium and recording method using the same |
| EP1734080A1 (en) * | 2004-03-30 | 2006-12-20 | Taiyoyuden Co., Ltd. | Monomethine dye compound, optical information recording medium utilizing the compound and process for producing the same |
-
1986
- 1986-01-20 JP JP61009461A patent/JPH0720729B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0321923A2 (en) * | 1987-12-21 | 1989-06-28 | EASTMAN KODAK COMPANY (a New Jersey corporation) | Infrared absorbing cyanine dyes for dye-donor element used in laser-induced thermal dye transfer |
| JPH0289683A (en) * | 1988-09-27 | 1990-03-29 | Fuji Photo Film Co Ltd | Information recording medium and recording method using the same |
| EP1734080A1 (en) * | 2004-03-30 | 2006-12-20 | Taiyoyuden Co., Ltd. | Monomethine dye compound, optical information recording medium utilizing the compound and process for producing the same |
| EP1734080A4 (en) * | 2004-03-30 | 2009-08-05 | Taiyo Yuden Kk | Monomethine dye compound, optical information recording medium utilizing the compound and process for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0720729B2 (en) | 1995-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0193931B1 (en) | Optical high density recording mediums, method for making same and method for recording optical information in the medium | |
| US4767696A (en) | Laser information recording medium having an improved recording layer | |
| EP0502506B1 (en) | A photochromic material and an optical storage medium using the same | |
| JPS62167089A (en) | Laser recording medium | |
| JPS6161893A (en) | Optical recording medium | |
| JP2502785B2 (en) | Optical recording medium, recording method and reproducing method using the same | |
| FR2553531A1 (en) | PHOTOPOLYMERIZABLE MONOMER FOR OPTICAL RECORDING MEDIUM AND MEDIUM CONTAINING THE SAME | |
| JPH0696347B2 (en) | Optical recording body | |
| JPH05204102A (en) | Photomemory element and recording method therefor | |
| JP3168469B2 (en) | Optical recording medium | |
| JPH0367251B2 (en) | ||
| JPH04116545A (en) | Optical recording medium | |
| JPH0155120B2 (en) | ||
| JPH02229074A (en) | Optical recording medium | |
| JP5669124B2 (en) | Optically active compound and use thereof | |
| JPS61169838A (en) | Reversible organic optical memory material and its production | |
| JPH0224190A (en) | Optical recording material | |
| JPS6285991A (en) | Laser recording medium | |
| JPH0434140B2 (en) | ||
| JPS61137781A (en) | Recording medium | |
| JPS61201243A (en) | Light recording method | |
| Kharlamov et al. | The photoinduced surface pressure relaxation processes in amphiphilic spiropyrane and spiroindolinonaphthooxazine | |
| JPH0332885A (en) | Optical information recording medium | |
| JP2589845B2 (en) | Method for producing photochromic thin film | |
| JPH0451144A (en) | Indomethylene dye recording material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |