JPH03192345A - Optical recording medium and recording method - Google Patents
Optical recording medium and recording methodInfo
- Publication number
- JPH03192345A JPH03192345A JP1331065A JP33106589A JPH03192345A JP H03192345 A JPH03192345 A JP H03192345A JP 1331065 A JP1331065 A JP 1331065A JP 33106589 A JP33106589 A JP 33106589A JP H03192345 A JPH03192345 A JP H03192345A
- Authority
- JP
- Japan
- Prior art keywords
- thermoplastic resin
- information
- photochromic compound
- recording
- laser beam
- 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 31
- 238000000034 method Methods 0.000 title claims description 25
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 30
- 230000001678 irradiating effect Effects 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 230000009477 glass transition Effects 0.000 claims abstract description 5
- 150000001875 compounds Chemical class 0.000 claims description 52
- 238000006317 isomerization reaction Methods 0.000 claims description 13
- 239000000049 pigment Substances 0.000 claims description 6
- 230000031700 light absorption Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims 1
- 239000010409 thin film Substances 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 8
- 238000007699 photoisomerization reaction Methods 0.000 abstract description 7
- 239000011521 glass Substances 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 229920005989 resin Polymers 0.000 abstract description 4
- 239000011347 resin Substances 0.000 abstract description 4
- 230000009881 electrostatic interaction Effects 0.000 abstract description 3
- 230000001066 destructive effect Effects 0.000 abstract description 2
- 230000003100 immobilizing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- LKKPNUDVOYAOBB-UHFFFAOYSA-N naphthalocyanine Chemical compound N1C(N=C2C3=CC4=CC=CC=C4C=C3C(N=C3C4=CC5=CC=CC=C5C=C4C(=N4)N3)=N2)=C(C=C2C(C=CC=C2)=C2)C2=C1N=C1C2=CC3=CC=CC=C3C=C2C4=N1 LKKPNUDVOYAOBB-UHFFFAOYSA-N 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000005374 Kerr effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は光記録媒体および該媒体を使用する記録方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical recording medium and a recording method using the medium.
［従来の技術］
近年、記録容量の多量化に伴い、記録方式は磁気記録方
式から光による記録方式に変わりつつある。これは光記
録方式が磁気記録方式に比べて記録容量が大きいばかり
でなく、磁気記録方式で問題となる媒体上の塵に殆ど影
響されないからである。[Prior Art] In recent years, with the increase in recording capacity, the recording method is changing from a magnetic recording method to an optical recording method. This is because not only does the optical recording system have a larger recording capacity than the magnetic recording system, but it is also almost unaffected by dust on the medium, which is a problem with the magnetic recording system.
従来、記録・再生を行うことのできる光記録媒体として
は、情報の記録後に記録した情報が消去できない追記型
光ディスクと、情報の記録後に記録した情報を消去でき
、再度情報が記録できる書換型光ディスクが知られてい
る。追記型光ディスクは、ガラスまたはプラスチックの
基板上に低融点の金属または昇華性の色素膜を形成した
もので、情報の記録は１ノーザ光を照射してその熱によ
り前記金属または色素膜に孔を開けることにより行い、
記録された情報の読み出しは微弱なレーザ光を照射して
その反射光の強度変化から孔の有無を検出することによ
り行うものである。これらの記録法は光を熱エネルギー
に変換して記録を行うので、ヒートモード記録と称され
る。Conventionally, optical recording media that can be recorded and played back include write-once optical discs, in which recorded information cannot be erased after information has been recorded, and rewritable optical discs, in which recorded information can be erased after information has been recorded, and information can be recorded again. It has been known. A write-once optical disc has a low-melting metal or sublimable pigment film formed on a glass or plastic substrate. Information is recorded by irradiating a laser beam and using the heat to create holes in the metal or pigment film. This is done by opening;
The recorded information is read out by irradiating a weak laser beam and detecting the presence or absence of holes from changes in the intensity of the reflected light. These recording methods perform recording by converting light into thermal energy, and are therefore called heat mode recording.
一方、書換型光ディスクは、カー効果等の光磁気効果を
利用した方式や、結晶・非結晶間の相変化を利用した方
式や、熱可塑性樹脂に溶解または分散した有機色素膜の
熱膨張・緩和を利用した方式等のヒートモード記録の他
に、フォトクロミック化合物の可逆的な光異性化反応を
利用した方式が提案されている。この記録法は光子のエ
ネルギーを直接利用するので７４トンモード記録と称さ
れる。On the other hand, rewritable optical disks are manufactured using a method that utilizes magneto-optical effects such as the Kerr effect, a method that utilizes phase change between crystals and amorphous, or thermal expansion and relaxation of an organic dye film dissolved or dispersed in a thermoplastic resin. In addition to heat mode recording, such as a method using , a method using a reversible photoisomerization reaction of a photochromic compound has been proposed. This recording method directly utilizes the energy of photons and is therefore called 74 ton mode recording.
これらの書換型光ディスクにおける情報の記録・再生の
原理はそれぞれ異なるが、例えばフＡ１〜クロミズムを
利用する方式においては、情報の記録はレーザ光照射に
より照射部を着色または変色さけることにより行い、消
去は別の波長のレーザ光を照射して、着色または変色部
を元の状態に戻すことにより行い、読み出しは上記のど
ちらかの波長の微弱レーザ光により行うものである。The principles of recording and reproducing information on these rewritable optical discs are different, but for example, in the method using chromism, information is recorded by irradiating the irradiated area with laser light to avoid coloring or discoloring, and then erasing is performed. This is performed by irradiating a laser beam of a different wavelength to return the colored or discolored portion to its original state, and reading is performed using a weak laser beam of one of the above wavelengths.
［発明が解決しようとする課題］
従来の書換型光ディスクの記録方式はこのようにいくつ
かの方式が提案され、それらの方式のうらには実用化の
域に達しているものもあるが、光ディスクを構成する材
料選択の自由度が小さく、また製造原価が高くなったり
、あるいは婁換型光記録システムが目標としている諸性
能を十分に達成できないという問題点がめった。[Problem to be solved by the invention] As described above, several recording methods have been proposed for conventional rewritable optical discs, and some of these methods have reached the level of practical use. There have been many problems in that the degree of freedom in selecting the materials constituting the convertible optical recording system is low, the manufacturing cost is high, and the performance targeted by the convertible optical recording system cannot be sufficiently achieved.
本発明は以上述べたような従来の課題を解決するために
なされたもので、安価で高性能な光記録媒体および記録
方法を提供することを目的とする。The present invention was made in order to solve the conventional problems as described above, and an object of the present invention is to provide an inexpensive and high-performance optical recording medium and a recording method.
［課題を解決するための手段コ
本発明は、基板上に、色素化合物と、光照射により分子
の立体構造の変化を伴って光吸収係数が変化するフォト
クロミック化合物とを熱可塑性樹脂に溶解または分散さ
せた有機薄模層を設けてなることを特徴とする書換型光
記録媒体である。[Means for Solving the Problems] The present invention involves dissolving or dispersing in a thermoplastic resin a dye compound and a photochromic compound whose light absorption coefficient changes with a change in the three-dimensional structure of the molecule upon light irradiation on a substrate. This is a rewritable optical recording medium characterized by being provided with a thin organic layer.
また本発明によれば、熱可塑性樹脂中に存在する色素化
合物と）汁トクロミック化合物のそれぞれに感応する波
長の１ノーザ光を記録情報に対応させて照射することに
より、熱可塑性樹脂をそのガラス転移温度以上に加熱す
ると同時にフォトクロミック化合物を異性化し、次いで
光照射を停止することによって前記異性化したフォトク
ロミック化合物の分子構造を冷却固化した熱可塑性樹脂
により固定することを特徴とする情報の記録方法、およ
びこの記録方法によって記録された情報を、熱可塑性樹
脂中に存在する色素化合物と、異性化したフォトクロミ
ック化合物のそれぞれに感応する波長のレーザ光を同時
に照射することにより、熱可塑性樹脂をそのガラス転移
温度以上に加熱すると同時に前記異性化したフォトクロ
ミック化合物を異性化前の状態に戻すことを特徴とする
情報の消去方法、および前記した記録方法によって記録
された情報を、熱可塑性樹脂中に存在する色素に感応す
る波長のレーザ光を照射しながら、すでに記録されてい
る情報とは別の新たな記録情報に対応させて、異性化し
たフォトクロミック化合物に感応する波長のレーザ光の
照射または異性化前のフォトクロミック化合物に感応す
る波長のレーザ光照射を行い、次いで光照射を停止する
ことによって前記フォトクロミック化合物の分子構造を
冷却固化した熱可塑性樹脂により固定することを特徴と
する情報の重ね書き方法が提供される。Further, according to the present invention, by irradiating the thermoplastic resin with one laser beam having a wavelength sensitive to each of the pigment compound and the tochromic compound present in the thermoplastic resin in accordance with the recorded information, the thermoplastic resin is A method for recording information, characterized in that a photochromic compound is isomerized at the same time as it is heated above a temperature, and then the molecular structure of the isomerized photochromic compound is fixed by a thermoplastic resin that is cooled and solidified by stopping light irradiation, and By simultaneously irradiating the information recorded by this recording method with a laser beam of a wavelength that is sensitive to each of the pigment compound present in the thermoplastic resin and the isomerized photochromic compound, the thermoplastic resin is heated to its glass transition temperature. A method for erasing information, which is characterized in that the isomerized photochromic compound is returned to the state before isomerization at the same time as heating to While irradiating laser light with a sensitive wavelength, the isomerized photochromic compound is irradiated with a laser light with a sensitive wavelength, or the photochromic compound is irradiated with a laser light with a sensitive wavelength to correspond to new recorded information different from the information already recorded. Provided is a method for overwriting information, characterized in that the molecular structure of the photochromic compound is fixed by a thermoplastic resin that is cooled and solidified by irradiating laser light with a wavelength that is sensitive to the compound and then stopping the light irradiation. .
即ち、本発明は、これまでの書換型光記録媒体とは異な
り、フォトンモードとヒートモードを組み合わせた記録
法による新規な書換型光記録媒体を提供することにより
、これまでの書換型光記録媒体で生じる欠点を解決しよ
うとするものである。That is, the present invention differs from conventional rewritable optical recording media by providing a new rewritable optical recording medium using a recording method that combines photon mode and heat mode. This is an attempt to solve the shortcomings that occur in
［作用］
記録された情報の非破壊読み出し性と保存安定性の確保
は一般に光記録媒体の開発において重要な課題である。[Operation] Ensuring non-destructive readability and storage stability of recorded information is generally an important issue in the development of optical recording media.
しかし記録材料としてフォトクロミック化合物を用いる
書換型光記録媒体においては、それらの確保が困難であ
る。なぜならフォトクロミック化合物の異性化反応には
光の強度に対するしきい値がなく、また熱的にも反応が
進行する場合が多いからである。このような不要な異性
化反応を抑制するには、光記録媒体中においてフォトク
ロミック化合物の分子構造を固定化すればよい。However, in a rewritable optical recording medium using a photochromic compound as a recording material, it is difficult to secure them. This is because the isomerization reaction of photochromic compounds has no threshold for light intensity, and the reaction often proceeds thermally as well. In order to suppress such unnecessary isomerization reactions, the molecular structure of the photochromic compound may be fixed in the optical recording medium.
本発明においては、この固定化をフォトクロミック化合
物を熱可塑性樹脂中に溶解または分散することによって
行う。即ち、この両者の間の立体障害や静電的相互作用
によってフォトクロミック化合物の分子構造が固定され
て、読み出し用のレーザ光や熱によって進行する異性化
反応が抑制される。情報の記録、消去、あるいは書き換
えは、熱可塑性樹脂をガラス転移温度以上に加熱してゴ
ム状態とし、分子間の立体障害や静電的相互作用を乱す
と同時に、フォトクロミック化合物が感応する波長のレ
ーザ光を照射して光異性化反応を起こさせることにより
行う。熱可塑性樹脂を加熱するためには、レーザ光感応
性の色素化合物をフォトクロミック化合物と共に熱可塑
性樹脂中に溶解または分散しておく。加熱のためのレー
ザ光の照射を停止すると、熱可塑性樹脂は放熱により温
度が下がり、ゴム状態からガラス状態に戻って、フォト
クロミック化合物の分子構造は再び固定される。In the present invention, this immobilization is performed by dissolving or dispersing the photochromic compound in a thermoplastic resin. That is, the molecular structure of the photochromic compound is fixed due to steric hindrance and electrostatic interaction between the two, and the isomerization reaction that progresses due to readout laser light and heat is suppressed. To record, erase, or rewrite information, thermoplastic resin is heated above its glass transition temperature to turn it into a rubber state, disrupting steric hindrance and electrostatic interactions between molecules, and at the same time using a laser at a wavelength that photochromic compounds are sensitive to. This is done by irradiating light to cause a photoisomerization reaction. In order to heat the thermoplastic resin, a laser-sensitive dye compound is dissolved or dispersed in the thermoplastic resin together with a photochromic compound. When the laser beam irradiation for heating is stopped, the temperature of the thermoplastic resin decreases due to heat radiation, returning from a rubber state to a glass state, and the molecular structure of the photochromic compound is fixed again.
読み出しは照射したレーザ光の透過光または反射光を検
出して行う。読み出し用レーザ光は異性化前あるいは後
のフォトクロミック化合物の何れの感応波長も使用する
ことができる。しかも、従来の多くの光ディスクのよう
に、書き込まれている情報の劣化を抑えるためにレーザ
光の強度を弱める必要はない。Reading is performed by detecting transmitted light or reflected light of the irradiated laser light. As the reading laser beam, any sensitive wavelength of the photochromic compound before or after isomerization can be used. Moreover, unlike many conventional optical discs, there is no need to weaken the intensity of the laser beam in order to suppress the deterioration of written information.
［実施例］
以下、本発明の一実施例について、図面を参照して説明
する。[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例に係る書換型光ディスクの断
面図、第２図（ａ）〜（ｄ）はその動作を説明するため
の説明図、第３図は熱可塑性樹脂加熱用のレーザ光感受
性色素およびフォトクロミック化合物の光異性化前後の
スペクトルである。FIG. 1 is a sectional view of a rewritable optical disc according to an embodiment of the present invention, FIGS. 2(a) to (d) are explanatory diagrams for explaining its operation, and FIG. These are spectra of a laser-sensitive dye and a photochromic compound before and after photoisomerization.
第１図において、１は少なくとも透光性または反射性の
何れかの特性を有する基板であり、ガラス、セラミック
、金属、プラスチック等の透光性または反射性に優れた
材料からなっている。２は上記基板１上に形成された記
録膜で、常温においてガラス状態にある熱可塑性樹脂中
にレーザ光感受性色素化合物およびフォトクロミック化
合物を溶解または分散して構成したものである。In FIG. 1, reference numeral 1 denotes a substrate having at least one of transmissive or reflective properties, and is made of a material with excellent transmissive or reflective properties such as glass, ceramic, metal, or plastic. Reference numeral 2 denotes a recording film formed on the substrate 1, which is constructed by dissolving or dispersing a laser light-sensitive dye compound and a photochromic compound in a thermoplastic resin that is in a glass state at room temperature.
光記録媒体の製造は以下のようにして行った。The optical recording medium was manufactured as follows.
熱可塑性樹脂としてポリ塩化ビニル樹脂と、レーザ光感
受性色素化合物として鉄ナフタロシアニンと、フォトク
ロミック化合物としてピレンチオインジゴ誘導体とを重
量化５：１ ：１で混合した溶液をガラス基板上にスピ
ンコーターで塗布し乾燥することにより、本発明の光記
録媒体を得た。A solution containing a mixture of polyvinyl chloride resin as a thermoplastic resin, iron naphthalocyanine as a laser light-sensitive dye compound, and pyrenetoindigo derivative as a photochromic compound in a weight ratio of 5:1:1 is applied onto a glass substrate using a spin coater. By drying, an optical recording medium of the present invention was obtained.
なお、鉄ナフタロシアニンの吸収スペクトル図を第３図
の■に、ピレンチオインジゴ誘導体の異性化前後の吸収
スペクトル図をそれぞれ第３図の■および工に示す。同
図かられかるように、鉄ナフタロシアニンは７８０ ｎ
ｍを中心とした鋭い吸収帯を持ち、ピレンチオインジゴ
誘導体の異性化前の状態は８３０ ｎｍに、異性化後の
状態は６７０ ｆｉｌにそれぞれ吸収帯を持っている。In addition, the absorption spectrum diagram of iron naphthalocyanine is shown in (■) in Figure 3, and the absorption spectrum diagrams before and after isomerization of the pyrenchioindigo derivative are shown in (■) and (7) in Figure 3, respectively. As can be seen from the figure, iron naphthalocyanine is 780 n
It has a sharp absorption band centered at m, and the state before isomerization of the pyrenethioidigo derivative has an absorption band at 830 nm, and the state after isomerization has an absorption band at 670 fil.
これら２つの化合物の３つの吸収帯は互いに殆ど重なり
あっていない。The three absorption bands of these two compounds have little overlap with each other.
記録については第２図に示すように、記録膜加熱用のレ
ーザ光（７８０ｎｍ）と書き込み用のレーザ光（８３０
ｎｍ）を同時に照射しく第２図（ａ））、照射部を加熱
しながら同時にピレンチオインジゴ誘導体を光異性化す
ることにより行った（第２図（ｂ））。For recording, as shown in Figure 2, a laser beam (780 nm) for heating the recording film and a laser beam (830 nm) for writing are used.
This was carried out by simultaneously irradiating the pyrenchioindigo derivative (Fig. 2(a)) and heating the irradiated area (Fig. 2(b)).
この記録部３は室内に１ケ月間放置した後も全く変化し
なかった。This recording section 3 did not change at all even after being left indoors for one month.
再生については、第２図（Ｃ）に示すように、８３０
ｎｍまたは６７０ ｎｍの半導体レーザを用い、記録領
域中のピレンチオインジゴ誘導体の異性化前および後の
状態の透過率の変化を測定することにより行い、再生が
可能なことを確認した。さらに、再生用の半導体レーザ
の出力は、書き込み時と同じパワーおよびそれ以下のパ
ワーで可能であり、従来の多くの光ディスクのように、
書き込まれている情報の光劣化を抑えるために、大幅に
下げる必要はない。Regarding playback, as shown in Figure 2 (C), 830
It was confirmed that reproduction was possible using a semiconductor laser of 670 nm or 670 nm and measuring the change in transmittance before and after isomerization of the pyrenethioindigo derivative in the recording area. Furthermore, the output of the semiconductor laser for playback can be at the same power or less than that for writing, and like many conventional optical discs,
There is no need to lower it significantly in order to suppress photodegradation of written information.
消去は第２図（ｄ）に示すように、７ＢＯｒａｍと６７
０ ｎ１Ｔｌのレーザ光を同時に照射し、熱可塑性樹脂
を加熱すると同時に、ピレンチオインジゴ誘導体の異性
化侵の状態を異性化前の状態に戻すことにより行った。Erasing is performed using 7BOram and 67 as shown in Figure 2(d).
This was done by simultaneously irradiating a laser beam of 0 n1Tl to heat the thermoplastic resin and at the same time returning the isomerization state of the pyrenethioindigo derivative to the state before isomerization.
オーバライドは、既に記録された部分に消去の操作を行
いながら、その直後に８３０ ｎｍの書き込み用レーザ
光を照射して新しく信号を記録することにより行った。Overriding was performed by performing an erasing operation on the already recorded portion, and immediately thereafter irradiating a writing laser beam of 830 nm to record a new signal.
また、オーバライドは、既に記録された部分に７８Ｏｎ
＋ｎのレーザ光を照射して熱可塑性樹脂を加熱するのと
同時に、新しい記録情報に対応させて６７０ ｎｍまた
は８３０ ｎｍのレーザ光を照射してもよい。Also, override can be applied to the already recorded part.
At the same time as +n laser light is irradiated to heat the thermoplastic resin, 670 nm or 830 nm laser light may be irradiated in response to new recorded information.
なお、本発明における基板、熱可塑性樹脂、レーザ光感
受性色素化合物、フォトクロミック化合物は実施例に示
した材料に限定されるものではない。また、本発明にお
けるレーザ光の波長は実施例に示した波長に限定される
ものではない。Note that the substrate, thermoplastic resin, laser light-sensitive dye compound, and photochromic compound in the present invention are not limited to the materials shown in the examples. Furthermore, the wavelength of the laser light in the present invention is not limited to the wavelengths shown in the examples.
例えば、色素化合物およびフォトクロミック化合物の組
み合わせとして、色素化合物の光吸収波長領域がフォト
クロミック化合物の光異性化前または後の何れかの状態
の光吸収波長領域と重複したものを用い、色素化合物に
感応する波長のレーザ光と、フォトクロミック化合物の
光異性化前または後に感応する波長のレーザ光の何れか
、とを同一波長のレーザ光とし、２種類の波長のレーザ
光で記録・再生・消去および重ね書きをすることもでき
る。For example, as a combination of a dye compound and a photochromic compound, the light absorption wavelength range of the dye compound overlaps with the light absorption wavelength range of the photochromic compound either before or after photoisomerization, and the combination is sensitive to the dye compound. A laser beam of the same wavelength and a laser beam of a wavelength to which the photochromic compound is sensitive before or after photoisomerization are used as laser beams of the same wavelength, and recording, reproduction, erasing, and overwriting are performed using laser beams of two different wavelengths. You can also do
［発明の効果］
以上説明したように、本発明によればフォトンモード記
録とヒートモード記録を組み合わせることにより、フォ
トンモード記録による場合の欠点、すなわち記録の保存
安定性および読み出し光による記録の劣化、破壊を防ぎ
、安価で高性能の書換型光記録媒体が得られる効果があ
る。[Effects of the Invention] As explained above, according to the present invention, by combining photon mode recording and heat mode recording, the drawbacks of photon mode recording, namely, the storage stability of recording and the deterioration of recording due to readout light, can be solved. This has the effect of preventing destruction and providing an inexpensive, high-performance rewritable optical recording medium.
第１図は本発明の一実施例の書換型光記録媒体の断面図
、第２図はその動作を説明するための説明図、第３図は
熱可塑性樹脂加熱用のレーザ光感受性色素化合物の一例
およびフォトクロミック化合物の一例の光異性化前後の
吸収スペクトル図である。
１・・・基板
２・・・記録膜
３・・・記録部Fig. 1 is a cross-sectional view of a rewritable optical recording medium according to an embodiment of the present invention, Fig. 2 is an explanatory diagram for explaining its operation, and Fig. 3 is a cross-sectional view of a rewritable optical recording medium according to an embodiment of the present invention. FIG. 2 is an absorption spectrum diagram of an example and an example of a photochromic compound before and after photoisomerization. 1...Substrate 2...Recording film 3...Recording section
Claims (4)
体構造の変化を伴つて光吸収係数が変化するフォトクロ
ミック化合物とを熱可塑性樹脂に溶解または分散させた
有機薄膜層を設けてなることを特徴とする書換型光記録
媒体。(1) An organic thin film layer is provided on the substrate, in which a dye compound and a photochromic compound whose light absorption coefficient changes as the three-dimensional structure of the molecule changes when irradiated with light are dissolved or dispersed in a thermoplastic resin. A rewritable optical recording medium characterized by:
ロミック化合物のそれぞれに感応する波長のレーザ光を
記録情報に対応させて照射することにより、熱可塑性樹
脂をそのガラス転移温度以上に加熱すると同時にフォト
クロミック化合物を異性化し、次いで光照射を停止する
ことによって前記異性化したフォトクロミック化合物の
分子構造を冷却固化した熱可塑性樹脂により固定するこ
とを特徴とする情報の記録方法。(2) By irradiating a laser beam with a wavelength that is sensitive to each of the pigment compounds and photochromic compounds present in the thermoplastic resin in accordance with the recorded information, the thermoplastic resin is heated to above its glass transition temperature and the photochromic compound is simultaneously heated. 1. A method for recording information, comprising isomerizing the compound and then stopping light irradiation to fix the molecular structure of the isomerized photochromic compound with a thermoplastic resin that has been cooled and solidified.
情報を、熱可塑性樹脂中に存在する色素化合物と、異性
化したフォトクロミック化合物のそれぞれに感応する波
長のレーザ光を同時に照射することにより、熱可塑性樹
脂をそのガラス転移温度以上に加熱すると同時に前記異
性化したフオトクロミツク化合物を異性化前の状態に戻
すことを特徴とする情報の消去方法。(3) The information recorded by the recording method according to claim (2) is simultaneously irradiated with a laser beam having a wavelength sensitive to each of the pigment compound present in the thermoplastic resin and the isomerized photochromic compound. A method for erasing information, comprising heating a thermoplastic resin to a temperature higher than its glass transition temperature and simultaneously returning the isomerized photochromic compound to its state before isomerization.
情報を、熱可塑性樹脂中に存在する色素に感応する波長
のレーザ光を照射しながら、すでに記録されている情報
とは別の新たな記録情報に対応させて、異性化したフォ
トクロミック化合物に感応する波長のレーザ光の照射ま
たは異性化前のフォトクロミック化合物に感応する波長
のレーザ光照射を行い、次いで光照射を停止することに
よつて前記フォトクロミック化合物の分子構造を冷却固
化した熱可塑性樹脂により固定することを特徴とする情
報の重ね書き方法。(4) The information recorded by the recording method according to claim (2) is irradiated with a laser beam having a wavelength sensitive to the dye present in the thermoplastic resin, and the information is different from the information already recorded. In response to the new recorded information, irradiation with laser light at a wavelength sensitive to the isomerized photochromic compound or irradiation with laser light at a wavelength sensitive to the photochromic compound before isomerization is performed, and then the light irradiation is stopped. A method for overwriting information, characterized in that the molecular structure of the photochromic compound is fixed by a thermoplastic resin that is solidified by cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1331065A JP2844769B2 (en) | 1989-12-22 | 1989-12-22 | Optical recording medium and recording method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1331065A JP2844769B2 (en) | 1989-12-22 | 1989-12-22 | Optical recording medium and recording method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03192345A true JPH03192345A (en) | 1991-08-22 |
| JP2844769B2 JP2844769B2 (en) | 1999-01-06 |
Family
ID=18239468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1331065A Expired - Lifetime JP2844769B2 (en) | 1989-12-22 | 1989-12-22 | Optical recording medium and recording method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2844769B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06102616A (en) * | 1992-09-18 | 1994-04-15 | Sharp Corp | Optical memory element |
| WO2006075326A1 (en) * | 2005-01-12 | 2006-07-20 | Mempile Inc. | Heating additives for three dimensional optical memory |
| US8501371B2 (en) * | 2006-12-14 | 2013-08-06 | General Electric Company | Holographic data storage method and system |
| US9164480B2 (en) * | 2006-12-14 | 2015-10-20 | General Electric Company | Holographic data storage device and method of making |
-
1989
- 1989-12-22 JP JP1331065A patent/JP2844769B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06102616A (en) * | 1992-09-18 | 1994-04-15 | Sharp Corp | Optical memory element |
| WO2006075326A1 (en) * | 2005-01-12 | 2006-07-20 | Mempile Inc. | Heating additives for three dimensional optical memory |
| US8501371B2 (en) * | 2006-12-14 | 2013-08-06 | General Electric Company | Holographic data storage method and system |
| US9164480B2 (en) * | 2006-12-14 | 2015-10-20 | General Electric Company | Holographic data storage device and method of making |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2844769B2 (en) | 1999-01-06 |
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