JPH0422439B2 - - Google Patents
Info
- Publication number
- JPH0422439B2 JPH0422439B2 JP62307455A JP30745587A JPH0422439B2 JP H0422439 B2 JPH0422439 B2 JP H0422439B2 JP 62307455 A JP62307455 A JP 62307455A JP 30745587 A JP30745587 A JP 30745587A JP H0422439 B2 JPH0422439 B2 JP H0422439B2
- Authority
- JP
- Japan
- Prior art keywords
- recording
- layer
- photochromic
- layers
- recording medium
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24038—Multiple laminated recording layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00455—Recording involving reflectivity, absorption or colour changes
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は書き換え可能な光学記録媒体、特に高
密度情報記録の可能な光学記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rewritable optical recording medium, particularly to an optical recording medium capable of recording high-density information.
従来の技術
光学記録を一層高密度化するための手段とし
て、光のスポツト１ケにつき複数ビツトの情報を
記録する方式すなわち波長多重記録が試みられて
いる。そのための手段として異なる吸収波長を有
するフオトクロミツク化合物を順次積層した光学
記録媒体が提案されている（例えば特開昭61−
203450号公報）。2. Description of the Related Art As a means to further increase the density of optical recording, attempts have been made to use a method of recording multiple bits of information per spot of light, that is, wavelength multiplexing recording. As a means for achieving this, an optical recording medium in which photochromic compounds having different absorption wavelengths are sequentially laminated has been proposed (for example,
Publication No. 203450).
発明が解決しようとする問題点
着色体の光吸収波長がそれぞれ異なつた複数種
のフオトクロミツク化合物を積層してなる記録層
に対して波長多重記録を行なうためには、それぞ
れのフオトクロミツク化合物の吸収極大波長に対
応する波長のレーザ光を照射することが必要であ
る。このとき、そのレーザ光の波長に着色体の吸
収感度を有するフオトクロミツク化合物のみがそ
の光を吸収して無色体に戻り、そのレーザ光の波
長に対応しないフオトクロミツク化合物は変化し
ない。これによつて同じスポツトに照射するレー
ザの波長を変えることにより複数ビツトの情報の
記録が可能になる。しかし、実際にはレーザ光の
照射によりフオトクロミツク材料に吸収された光
の大部分が熱に変わるため、その熱緩和のため
に、例えば層の形状の変化等を引き起こし、隣接
する記録層のフオトクロミツク化合物の変化も誘
起される。すなわち記録を行なおうとしたフオト
クロミツク化合物以外の層のフオトクロミツク化
合物にも記録が行なわれてしまい、記録の独立性
が失われる。この現象はクロストークと呼ばれ、
波長多重光記録を効率よく行なうための課題とな
つていた。これまでこの層間での熱緩和を抑える
ための適当な分離膜がなく、波長多重記録の光学
記録媒体を得ることができなかつた。Problems to be Solved by the Invention In order to perform wavelength multiplexing recording on a recording layer formed by laminating multiple types of photochromic compounds, each of which has a different light absorption wavelength, it is necessary to determine the maximum absorption wavelength of each photochromic compound. It is necessary to irradiate the laser beam with a wavelength corresponding to the wavelength. At this time, only the photochromic compounds that have absorption sensitivity of the colored body to the wavelength of the laser light absorb the light and return to the colorless body, and the photochromic compounds that do not correspond to the wavelength of the laser light do not change. This makes it possible to record multiple bits of information by changing the wavelength of the laser irradiated to the same spot. However, in reality, most of the light absorbed by the photochromic material due to laser beam irradiation is converted into heat, which causes, for example, a change in the shape of the layer due to the thermal relaxation, causing the photochromic compound of the adjacent recording layer to change. changes are also induced. That is, recording is also performed on photochromic compounds in layers other than the photochromic compound on which recording is intended, and the independence of recording is lost. This phenomenon is called crosstalk,
This has been an issue in order to efficiently perform wavelength multiplexed optical recording. Until now, there has been no suitable separation film for suppressing thermal relaxation between layers, and it has not been possible to obtain an optical recording medium for wavelength multiplexing recording.
たとえばこの分離膜をスピンコート法を用いて
作製すると、その際に用いる溶媒が記録層をも溶
解し、膜構造が著しく乱れる。また、蒸着法では
基板の温度が上昇するため、やはり膜構造が乱れ
た。 For example, when this separation membrane is manufactured using a spin coating method, the solvent used at that time also dissolves the recording layer, resulting in significant disturbance of the membrane structure. Furthermore, since the temperature of the substrate increases in the vapor deposition method, the film structure is also disturbed.
問題点を解決するための手段
上記課題を解決するために、本願発明は、着色
体の光吸収波長領域がそれぞれ異なつた少なくと
も２種類以上のフオトクロミツク化合物を順次積
層した光学記録媒体において、前記フオトクロミ
ツク化合物からなる記録層の間をLB膜によつて
分離されたことを特徴とする光学記録媒体を提供
するものである。Means for Solving the Problems In order to solve the above problems, the present invention provides an optical recording medium in which at least two or more types of photochromic compounds, each of which has a different light absorption wavelength region of a colored body, are laminated in sequence. The object of the present invention is to provide an optical recording medium characterized in that recording layers consisting of the following are separated by a LB film.
作 用
LB膜は、製膜の際に有機溶媒を用いず、また
常温常圧で製膜が可能なので、分離しようとする
フオトクロミツク化合物からなる記録層を乱すこ
となく製膜することが可能である。また、分離層
自体の膜厚が十分薄いため、それぞれの記録層へ
レーザ照射して記録を行なう際に、それぞれの記
録層に対してフオーカスする高さを制御し直す必
要がないという副次的な作用もある。Function: LB films do not use organic solvents during film formation and can be formed at room temperature and pressure, so it is possible to form films without disturbing the recording layer made of the photochromic compound to be separated. . In addition, since the separation layer itself is sufficiently thin, there is no need to recontrol the focusing height for each recording layer when recording by irradiating a laser to each recording layer. There are also effects.
実施例 １
スピロピラン（SP1822）を最下層に、トリパ
ルミチンを中間層に、さらにスピロピラン
（SP117）を最上層にしてそれぞれLB膜を形成し
た。Example 1 LB films were formed using spiropyran (SP1822) as the bottom layer, tripalmitin as the middle layer, and spiropyran (SP117) as the top layer.
まずSP1822をベンゼン溶液にし、LB法を用い
て以下の条件で基板上に記録層を作成した。 First, SP1822 was made into a benzene solution, and a recording layer was created on the substrate using the LB method under the following conditions.
基板：シリカガラスをクロルトリメチルシラン
の10％トルエン溶液に10分間浸せきした
後、トリクロルエタンで洗浄したもの
トラフ：140mm×600mm
サブフエーズ：PH7.0 リン酸バツフアー
温度18℃
圧縮速度：20mm／min
累積圧：20mN／ｍ
この記録層を35℃程度の熱と紫外光によつて着
色形に変換した。この層の上に分離層としてトリ
パルミチンを同様の方法で10層累積した。最後に
SP117／ステアリン酸＝1/2を６層累積した。こ
れらの層の累積条件はSP1822の条件に準じて行
つた。 Substrate: Silica glass immersed in a 10% toluene solution of chlorotrimethylsilane for 10 minutes and then washed with trichloroethane Trough: 140mm x 600mm Subphase: PH7.0 Phosphate buffer Temperature 18℃ Compression speed: 20mm/min Cumulative pressure :20 mN/m This recording layer was converted into a colored form by applying heat to about 35° C. and ultraviolet light. On top of this layer, 10 layers of tripalmitin were accumulated as a separation layer in the same manner. lastly
Six layers of SP117/stearic acid = 1/2 were accumulated. The accumulation conditions for these layers were conducted in accordance with the conditions of SP1822.
本記録層は、618nmの光（40mJ／cm2）を照射
することによつてSP1822の記録層のみがフオト
クロミツク反応を起こし（第１図）、480nmの光
（40mJ／cm2）を照射することによつて、SP117の
記録層のみがそれぞれ独立にフオトクロミツク反
応を起こした（第２図）。 When this recording layer is irradiated with 618 nm light (40 mJ/cm 2 ), only the recording layer of SP1822 causes a photochromic reaction (Figure 1), and when irradiated with 480 nm light (40 mJ/cm 2 ), only the recording layer of SP1822 causes a photochromic reaction. As a result, only the recording layer of SP117 caused a photochromic reaction independently (Fig. 2).
さらに紫外光を照射することによつて、再び両
記録層は初期状態に戻つた。 Further irradiation with ultraviolet light returned both recording layers to their initial states again.
なお分離層としてトリパルミチンがない場合、
両記録層の相互作用によつて独立なフオトクロミ
ツク反応が阻害されるため、紫外光照射で初期状
態に戻すことはできなかつた。 In addition, if there is no tripalmitin as a separation layer,
Since independent photochromic reactions were inhibited by the interaction between both recording layers, it was not possible to return to the initial state by irradiation with ultraviolet light.
実施例 ２
SP1822の0.3mol／ｌトルエン溶液を用い、ト
リクロルエタンで洗浄したシリカガラスの上に、
600rpmで60秒スピンコートを行つて記録層を形
成した。この記録層を熱と紫外光によつて着色形
に変換した。この層の上にトリパルミチンを実施
例１と同様の方法で10層累積した。その上に
SP117／ステアリン酸＝1/2を６層累積した。累
積条件はSP1822の条件に準じて行つた。Example 2 A 0.3 mol/l toluene solution of SP1822 was used on silica glass washed with trichloroethane.
A recording layer was formed by spin coating at 600 rpm for 60 seconds. This recording layer was converted into colored form by heat and ultraviolet light. On this layer, 10 layers of tripalmitin were accumulated in the same manner as in Example 1. in addition
Six layers of SP117/stearic acid = 1/2 were accumulated. The accumulation conditions were conducted according to the conditions of SP1822.
本記録層は、実施例１と同様に618nmの光を照
射することによつてSP1822の記録層のみがフオ
トクロミツク反応を起こし、480nmの光を照射す
ることによつて、SP117の記録層のみがそれぞれ
独立にフオトクロミツク反応を起こした。 In this recording layer, only the SP1822 recording layer caused a photochromic reaction by irradiating it with 618 nm light, as in Example 1, and only the SP117 recording layer caused a photochromic reaction by irradiating it with 480 nm light. Photochromic reactions were carried out independently.
さらに紫外光を照射することによつて、再び両
記録層は初期状態に戻つた。 Further irradiation with ultraviolet light returned both recording layers to their initial states again.
なお分離層としてトリパルミチンがない場合、
両記録層の相互作用によつて独立なフオトクロミ
ツク反応が阻害されるため、紫外光照射で初期状
態に戻すことはできなかつた。 In addition, if there is no tripalmitin as a separation layer,
Since independent photochromic reactions were inhibited by the interaction between both recording layers, it was not possible to return to the initial state by irradiation with ultraviolet light.
実施例 ３
スピロピラン（SP1801）を最下層に、ステア
リン酸バリウムを中間層に、さらに下記構造のフ
ルギド（FF−10）を最上層にしてそれぞれLB膜
を形成した。Example 3 LB films were formed using spiropyran (SP1801) as the bottom layer, barium stearate as the middle layer, and fulgide (FF-10) having the following structure as the top layer.
SP1801／ステアリン酸＝1/1をベンゼン溶液に
し、LB法を用いて以下の条件で基板上に記録層
を作成した。 SP1801/stearic acid = 1/1 was made into a benzene solution, and a recording layer was created on the substrate using the LB method under the following conditions.
基板：シリカガラスをクロルトリメチルシラン
の10％トルエン溶液に10分間浸せきした
後、トリクロルエタンで洗浄したもの
トラフ：140mm×600mm
サブフエーズ：PH7.0 リン酸バツフアー
温度18℃
圧縮速度：20mm／min
累積圧：20mN／ｍ
この層の上に以下の条件でステアリン酸バリウ
ムを10層累積した。 Substrate: Silica glass immersed in a 10% toluene solution of chlorotrimethylsilane for 10 minutes and then washed with trichloroethane Trough: 140mm x 600mm Subphase: PH7.0 Phosphate buffer Temperature 18℃ Compression speed: 20mm/min Cumulative pressure : 20 mN/m On this layer, 10 layers of barium stearate were accumulated under the following conditions.
展開物質：ステアリン酸
サブフエイズ：塩化バリウム／炭酸水素ナトリ
ウム
圧縮速度：20mm／min
累積圧：30mN／ｍ
その上にFF−10／オクタデカン＝1/2を６層累
積した。累積条件はSP1822の条件に準じて行つ
た。この記録層を紫外光によつて着色形に変換し
た。 Developing substance: stearic acid Subphase: barium chloride/sodium hydrogen carbonate Compression speed: 20 mm/min Cumulative pressure: 30 mN/m Six layers of FF-10/octadecane=1/2 were accumulated thereon. The accumulation conditions were conducted according to the conditions of SP1822. This recording layer was converted into colored form by means of ultraviolet light.
本記録層は、600nmの光を照射することによつ
てSP1801の記録層のみがフオトクロミツク反応
を起こし、500nmの光を照射することによつて、
FF−10の記録層のみがそれぞれ独立にフオトク
ロミツク反応を起こした。 When this recording layer is irradiated with 600 nm light, only the recording layer of SP1801 causes a photochromic reaction, and when irradiated with 500 nm light, a photochromic reaction occurs.
Only the recording layers of FF-10 caused photochromic reactions independently.
さらに紫外光を照射することによつて、再び両
記録層は初期状態に戻つた。 Further irradiation with ultraviolet light returned both recording layers to their initial states again.
なお分離層としてステアリン酸バリウムがない
場合、両記録層の相互作用によつて独立なフオト
クロミツク反応が阻害されるため、紫外光照射で
初期状態に戻すことはできなかつた。 Note that in the absence of barium stearate as a separation layer, independent photochromic reactions were inhibited by the interaction between both recording layers, so it was not possible to return to the initial state by irradiation with ultraviolet light.
なお、このような分離膜としてはトリパルミチ
ン、ステアリン酸バリウムの他にステアリン酸メ
チル、ステアリルアルコールを用いても独立なフ
オトクロミツク反応を起こさせることができる。 Note that, in addition to tripalmitin and barium stearate, methyl stearate and stearyl alcohol may be used as such a separation membrane to cause an independent photochromic reaction.
また記録層数にも制限はない。 There is also no limit to the number of recording layers.
発明の効果
本発明により、記録特性がよく、記録寿命も長
い、超高密度の光学記録媒体の提供が可能とな
り、その波及効果は大である。Effects of the Invention The present invention makes it possible to provide an ultra-high density optical recording medium with good recording characteristics and a long recording life, and its ripple effects are significant.
第１図は、本発明の一実施例における光学記録
媒体の初期の吸収スペクトルと、618nmのレーザ
光を照射した後の吸収スペクトルの差を示すスペ
クトル図、第２図は、同実施例における光学記録
媒体の初期の吸収スペクトルと、480nmのレーザ
ー光を照射した後の吸収スペクトルの差を示すス
ペクトル図である。
FIG. 1 is a spectrum diagram showing the difference between the initial absorption spectrum of an optical recording medium in one embodiment of the present invention and the absorption spectrum after irradiation with a 618 nm laser beam, and FIG. FIG. 2 is a spectrum diagram showing the difference between the initial absorption spectrum of a recording medium and the absorption spectrum after irradiation with a 480 nm laser beam.
Claims (1)
少なくとも２種類以上のフオトクロミツク化合物
を順次積層した光学記録媒体において、前記フオ
トクロミツク化合物からなる記録層の間をLB（ラ
ングミユアーブロジエツト）膜によつて分離され
たことを特徴とする光学記録媒体。 ２ LB膜が脂肪酸、脂肪酸エステル、脂肪族ア
ルコール、または脂肪酸金属塩であることを特徴
とする特許請求の範囲第１項に記載の光学記録媒
体。[Scope of Claims] 1. In an optical recording medium in which at least two or more types of photochromic compounds, each of which has a different light absorption wavelength region, are sequentially laminated, an LB (Language Microwave Block) is provided between the recording layers made of the photochromic compounds. An optical recording medium characterized in that it is separated by a film. 2. The optical recording medium according to claim 1, wherein the LB film is a fatty acid, a fatty acid ester, an aliphatic alcohol, or a fatty acid metal salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62307455A JPH01148590A (en) | 1987-12-07 | 1987-12-07 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62307455A JPH01148590A (en) | 1987-12-07 | 1987-12-07 | Optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01148590A JPH01148590A (en) | 1989-06-09 |
| JPH0422439B2 true JPH0422439B2 (en) | 1992-04-17 |
Family
ID=17969270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62307455A Granted JPH01148590A (en) | 1987-12-07 | 1987-12-07 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01148590A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5079061A (en) * | 1989-02-27 | 1992-01-07 | Matsushita Electric Industrial Co., Ltd. | Optical storage media |
| JPH03144938A (en) * | 1989-10-30 | 1991-06-20 | Sharp Corp | Optical memory element |
| JPH0798934B2 (en) * | 1990-10-05 | 1995-10-25 | 松下電器産業株式会社 | Photochromic material and optical recording medium |
| JP2768567B2 (en) * | 1991-06-20 | 1998-06-25 | シャープ株式会社 | Optical recording medium |
| JPH07199401A (en) * | 1993-12-10 | 1995-08-04 | Minnesota Mining & Mfg Co <3M> | Color image material and color image formation using material thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61215542A (en) * | 1985-03-20 | 1986-09-25 | Matsushita Electric Ind Co Ltd | optical recording medium |
| JPS61229242A (en) * | 1985-04-04 | 1986-10-13 | Ricoh Co Ltd | Method for recording and reproducing optical information |
| JPS61239988A (en) * | 1985-04-16 | 1986-10-25 | Canon Inc | recoding media |
| JPS61277492A (en) * | 1985-06-03 | 1986-12-08 | Ricoh Co Ltd | optical information recording medium |
| JPS62147456A (en) * | 1985-12-20 | 1987-07-01 | Matsushita Electric Ind Co Ltd | optical recording medium |
| JPS62147455A (en) * | 1985-12-20 | 1987-07-01 | Matsushita Electric Ind Co Ltd | optical recording medium |
-
1987
- 1987-12-07 JP JP62307455A patent/JPH01148590A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01148590A (en) | 1989-06-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |