JPH01259353A - Optical recording medium and method for detecting recording state - Google Patents
Optical recording medium and method for detecting recording stateInfo
- Publication number
- JPH01259353A JPH01259353A JP63087259A JP8725988A JPH01259353A JP H01259353 A JPH01259353 A JP H01259353A JP 63087259 A JP63087259 A JP 63087259A JP 8725988 A JP8725988 A JP 8725988A JP H01259353 A JPH01259353 A JP H01259353A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- optical recording
- recording layer
- recording
- long
- 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 description 15
- 238000000034 method Methods 0.000 title description 5
- 239000000178 monomer Substances 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 7
- 150000004668 long chain fatty acids Chemical class 0.000 claims abstract 5
- 239000002184 metal Chemical class 0.000 claims abstract 3
- 150000003839 salts Chemical class 0.000 claims abstract 3
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract 2
- 229930195733 hydrocarbon Natural products 0.000 claims abstract 2
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract 2
- 150000001875 compounds Chemical class 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims 2
- 238000000926 separation method Methods 0.000 claims 2
- 238000010521 absorption reaction Methods 0.000 claims 1
- 150000001298 alcohols Chemical class 0.000 claims 1
- 150000002148 esters Chemical class 0.000 claims 1
- 150000002484 inorganic compounds Chemical class 0.000 claims 1
- 229910010272 inorganic material Inorganic materials 0.000 claims 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical class CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract 1
- 239000012528 membrane Substances 0.000 abstract 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 12
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 239000010408 film Substances 0.000 description 5
- 235000021355 Stearic acid Nutrition 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 4
- 238000002189 fluorescence spectrum Methods 0.000 description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000008117 stearic acid Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 2
- 229910001626 barium chloride Inorganic materials 0.000 description 2
- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 2
- RZJRJXONCZWCBN-UHFFFAOYSA-N octadecane Chemical compound CCCCCCCCCCCCCCCCCC RZJRJXONCZWCBN-UHFFFAOYSA-N 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 1
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- DCXXMTOCNZCJGO-UHFFFAOYSA-N Glycerol trioctadecanoate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC DCXXMTOCNZCJGO-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical compound [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229940038384 octadecane Drugs 0.000 description 1
- 239000008363 phosphate buffer Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000005051 trimethylchlorosilane Substances 0.000 description 1
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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/685—Compositions containing spiro-condensed pyran compounds or derivatives thereof, as photosensitive substances
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は記録密度の高い書き換え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 with high recording density.
従来の技術
従来、波長の興なる２種類の光源により、可逆的な色の
変化を生ずる材料としてフォトクロミック材料が知られ
ている。スピロピランはその代表例である。これらの可
逆性を利用して２値記憶による光学記録媒体が提案され
ているが（公開昭−６１−２０５１８７）実用化された
例はみあたらない。2. Description of the Related Art Photochromic materials have been known as materials that can reversibly change color when exposed to two types of light sources with different wavelengths. Spiropyran is a typical example. Although an optical recording medium based on binary storage has been proposed by utilizing these reversibilities (Publication Publication No. 61-205187), no examples have been put into practical use.
発明が解決しようとする課題
スピロピランについての無色体、着色体の間の可逆的な
反応を光記憶媒体に応用する場合、１種類のスピロピラ
ンを用いる限り一つの状態しか記録できないことになり
、記録密度が低いものしか得られない。Problems to be Solved by the Invention When applying the reversible reaction between colorless and colored spiropyran to optical storage media, only one state can be recorded as long as one type of spiropyran is used, and the recording density You can only get something with a low value.
課題を解決するための手段
下記一般式で示されるもののう°ちの１種類のフォトク
ロミック化合物の単量体及び会合体を有する記録層から
なる光学記録媒体を形成する。Means for Solving the Problems An optical recording medium is formed that includes a recording layer having a monomer and an aggregate of one type of photochromic compound represented by the following general formula.
（ただしＲ＋ ”−ＣＩ−１２０ｃＯｃｎ１２−Ｉ、Ｒ
２” ＣＩＩＨ２１１＋Ｉ、ｎ。(However, R+ ”-CI-120cOcn12-I, R
2” CIIH211+I, n.
ｍは自然数）
作用
上記の化合物を用いて記録層を形成することにより、１
種類のフォトクロミック化合物を用いるだけで、吸収ス
ペクトルあるいは蛍光スペクトルの異なる単量体、会合
体の組合せからなる二つ以上の状態を記録できる密度の
高い書換え可能な光学記録媒体を提供し得る。(m is a natural number) Action By forming a recording layer using the above compound, 1
By simply using different types of photochromic compounds, it is possible to provide a high-density, rewritable optical recording medium that can record two or more states consisting of a combination of monomers and aggregates with different absorption spectra or fluorescence spectra.
実施例
実施例１
下記の構造で示されるスピロピラン（以下ＳＰ １８２
２と略す）を用いた。Examples Example 1 Spiropyran shown by the following structure (hereinafter SP 182
2) was used.
Ｏ
２１Ｈ４３
ＳＰｌ ８２２をベンゼンに１＋Ｍの濃度になるように
溶解したものを調製し、これを通常の条件（サブフェー
ズ：ｐＨ７／リン酸バツフアー、温度１８℃、圧縮速度
：２０ ｍａｒ／ｍ ｉｎ、累積圧：２０ｍＮ／ｎ＋）
でＬ 方法により、石英基板に累積して薄膜とした。石
英基板はトリメチルクロルシランの１０％トルエン溶液
に１０分間浸漬した後に、トリクロルエタンで洗浄し、
あらかじめ疎水性を施した。また、層数はＩＦｊで膜厚
は約２５人であった。このようにして作製した記録層を
１とする。この上に、ステアリン故バリウムを８層（展
開物質ニステアリン酸１ｍＭベンゼン溶液、サブフェー
ズ： ｐＨ８，６／ＢａＣｌ２、Ｋｌ（ＣＯ３、温度１
８℃、圧縮速度： ２０ｍｍ／ｗｉｎ。A solution of O 21H43 SPl 822 in benzene to a concentration of 1+M was prepared, and this was dissolved under normal conditions (subphase: pH 7/phosphate buffer, temperature 18°C, compression speed: 20 mar/min, cumulative Pressure: 20mN/n+)
By the L method, it was accumulated on a quartz substrate to form a thin film. The quartz substrate was immersed in a 10% toluene solution of trimethylchlorosilane for 10 minutes, and then washed with trichloroethane.
Hydrophobicity was applied in advance. Further, the number of layers was IFj and the film thickness was about 25 layers. The recording layer produced in this manner is referred to as 1. On top of this, 8 layers of late barium stearin (developing substance nistearic acid 1mM benzene solution, subphase: pH 8,6/BaCl2, Kl (CO3, temperature 1
8°C, compression speed: 20mm/win.
累積圧： ３０ｍＮ／ｍ）ＬＢ法により累積した。Cumulative pressure: 30 mN/m) Accumulated by LB method.
ざらに、その上にＳＰ １ Ｂ２２とステアリン酸をベ
ンゼンに各々０．１ｍＭ、１ｍＭの濃度に溶解した試料
溶液を用いて、これをＩＯＦ’累積した。累積の条件は
ステアリン酸の単独膜の累積のときと同じである。この
ようにして作製した記録層を２とする。Roughly, a sample solution in which SP 1 B22 and stearic acid were dissolved in benzene to a concentration of 0.1 mM and 1 mM, respectively, was used and IOF' was accumulated thereon. The conditions for accumulation are the same as for the accumulation of a single film of stearic acid. The recording layer produced in this manner is referred to as 2.
以−ヒで得られた累積膜にレーザー光（λ＝３４０ｎｍ
）を照射すると、蛍光スペクトルは図の■に示すように
なった。これは情報が消去された状態であり、記録層１
．２は各々にＳＰ １８２２の会合体（着色体）と単量
体（着色体）が形成されている。これに一定量のレーザ
ー光（λ＝ ５６０ ｎｍ）を照射することにより、吸
収スペクトルは図の■に示すようになった。これは記録
層１に情報が一つ書き込まれた状態であり、記録媒体中
には単量体（無色体）と会合体（着色体）が形成されて
いる。また、出力を５倍にして再びレーザー光（λ＝６
１８ｎｍ）を照射することにより、６００ｎｍより長波
長の蛍光は消失した。（図の■）これは記録層２に情報
が書き込まれた状態であり、記録媒体中には単量体（無
色体）のみが形成されている。Laser light (λ = 340 nm) was applied to the cumulative film obtained in
), the fluorescence spectrum became as shown in ■ in the figure. This is a state in which information has been erased, and the recording layer 1
．． 2 is formed of an aggregate (colored body) and a monomer (colored body) of SP 1822, respectively. By irradiating this with a certain amount of laser light (λ = 560 nm), the absorption spectrum became as shown in ■ in the figure. This is a state in which one piece of information is written in the recording layer 1, and monomers (colorless bodies) and aggregates (colored bodies) are formed in the recording medium. In addition, the output was increased 5 times and the laser beam (λ = 6
18 nm), the fluorescence with wavelengths longer than 600 nm disappeared. (■ in the figure) This is a state in which information is written in the recording layer 2, and only monomers (colorless bodies) are formed in the recording medium.
ここで、レーザー光（λ”３４０ｎ＊）の照射をおこな
うことにより、記録層１．２に記録されていた情報は再
度消去された。Here, the information recorded on the recording layer 1.2 was erased again by irradiation with laser light (λ''340n*).
なお、蛍光スペクトル以外に吸収スペクトルを用いても
、単量体と会合体の吸収スペクトルが異なるために、上
の消去、書き込みの状態を各々検出することができた。Note that even if absorption spectra were used in addition to fluorescence spectra, the above erasing and writing states could be detected, since the absorption spectra of monomers and aggregates were different.
実施例２
実施例１と同じ条件で、５Ｐ１Ｂ２２／オクタデカン＝
ｌ／２の混合膜をＬＢ法により石英基板上にｌＰ！累積
した。このようにして作製した記録層を１とする。この
上に、ステアリン酸バリウム８層（展開物質ニステアリ
ン酸１ｍＭベンゼン溶液、サブフェーズ： ｐＨ８，６
／ＢａＣｌ２、にＨＣＯ３、温度１８℃、圧縮速度：
２０ｍｍ／ｓｉｎ、累積圧：３０ｍＮ／ｍ）をＬＢ法に
より累積した。最後に、やはり実施例１と同様の条件で
ＬＢ法により５Ｐ１Ｂ２２／オクタデシルアルコール＝
１／１０の混合膜を１０層累積した。このようにして得
られた記録層１．２は実施例１と同様な書き込み、消去
の特性を示した。Example 2 Under the same conditions as Example 1, 5P1B22/octadecane =
A mixed film of l/2 is deposited on a quartz substrate using the LB method. Accumulated. The recording layer produced in this manner is referred to as 1. On top of this, 8 layers of barium stearate (developing substance nistearic acid 1mM benzene solution, subphase: pH 8,6
/BaCl2, HCO3, temperature 18°C, compression speed:
20 mm/sin, cumulative pressure: 30 mN/m) was accumulated by the LB method. Finally, 5P1B22/octadecyl alcohol =
Ten layers of 1/10 mixed films were accumulated. The recording layer 1.2 thus obtained exhibited writing and erasing characteristics similar to those of Example 1.
実施例３
ＳＰ１Ｂ２２をｌｏｍＭの濃度でトルエンに溶解させた
ものを用い、実施例１と同じ処理をした石英ガラスの片
面に、６００ ｒｐｍで６０秒スピンコードを行って記
録層を形成した。このようにして作製した記録層を１と
する。さらに、残ったもう一方の面に、やはり６００
ｒｐｍで６０秒スピンコードすることにより、ＳＰ １
Ｂ２２／ステアリン酸＝ｌ／１０の薄膜を形成した。Example 3 Using SP1B22 dissolved in toluene at a lomM concentration, a recording layer was formed on one side of quartz glass treated in the same manner as in Example 1 by performing spin code at 600 rpm for 60 seconds. The recording layer produced in this manner is referred to as 1. Furthermore, on the other side that remained, 600
SP 1 by spinning code for 60 seconds at rpm
A thin film of B22/stearic acid=1/10 was formed.
こうして作製した記録層を２とする。溶液はＳＰ
１ Ｂ２２、ステアリン酸を各々５１．５０ｍＭの濃度
になるようにトルエンに溶解させたものを用いた。The recording layer thus produced is referred to as 2. The solution is SP
1 B22 and stearic acid were each dissolved in toluene to a concentration of 51.50 mM.
以上のようにして得られた記録層は、実施例１と同様な
書き込み、消去の特性を示した。The recording layer obtained as described above exhibited writing and erasing characteristics similar to those of Example 1.
発明の効果
本発明により、一つのフォトクロミック化合物を用いる
だけで二つ以上の状態が記録できる書換え可能な光学記
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 a rewritable optical recording medium that can record two or more states simply by using one photochromic compound, and its ripple effects are significant.
図は本発明の一実施例における書き込みの状態と消去の
状態の蛍光スペクトル図である。
出願人 工業技術院長 飯塚幸三
憶 −＆ （ｎｍ）
１−ｍ−−−−
２□
−一一The figure is a fluorescence spectrum diagram of a writing state and an erasing state in an embodiment of the present invention. Applicant: Director of the Agency of Industrial Science and Technology Kozo Iizuka -& (nm) 1-m---- 2□ -11
Claims (8)
単量体及び会合体を有する記録層からなる光学記録媒体
。 ▲数式、化学式、表等があります▼ （ただしＲ＿１＝−ＣＨ＿２ＯＣＯＣ＿ｎＨ＿２＿ｎ＿
＋＿１、Ｒ＿２＝−Ｃ＿ｍＨ＿２＿ｍ＿＋＿１、ｎ、ｍ
は自然数）(1) An optical recording medium comprising a recording layer having a monomer and an aggregate of a photochromic compound represented by the following general formula. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (However, R_1=-CH_2OCOC_nH_2_n_
+_1, R_2=-C_mH_2_m_+_1, n, m
is a natural number)
肪酸金属塩のうちの１種以上の物質との混合膜中で形成
されることを特徴とする特許請求の範囲第１項記載の光
学記録媒体。(2) Claim 1, characterized in that the monomer is formed in a mixed film with one or more substances selected from long-chain fatty acids, long-chain alcohols, and long-chain fatty acid metal salts. The optical recording medium described.
混合膜を形成することを特徴とする特許請求の範囲第１
項記載の光学記録媒体。(3) Claim 1, characterized in that the aggregate forms a single film or a mixed film with a long-chain hydrocarbon.
Optical recording medium described in Section 1.
する特許請求の範囲第１項記載の光学記録媒体。(4) The optical recording medium according to claim 1, wherein the recording layer is formed of an LB film.
の単独膜あるいは混合膜からなる分離層を設けたことを
特徴とする特許請求の範囲第１項記載の光学記録媒体。(5) The optical recording medium according to claim 1, characterized in that a separation layer consisting of a single film or a mixed film of a long-chain fatty acid metal salt or a long-chain ester is provided between the recording layers.
たことを特徴とする特許請求の範囲第１項記載の光学記
録媒体。(6) The optical recording medium according to claim 1, characterized in that a separation layer made of an inorganic compound is provided between the recording layers.
単量体及び会合体を有する記録層からなる光学記録媒体
において、記録層中のフォトクロミック化合物の単量体
と会合体による記録状態を、吸収によって検出すること
を特徴とする記録状態の検出方法。 ▲数式、化学式、表等があります▼ （ただしＲ＿１＝−ＣＨ＿２ＯＣＯＣ＿ｎＨ＿２＿ｎ＿
＋＿１、Ｒ＿２＝−Ｃ＿ｍＨ＿２＿ｍ＿＋＿１、ｎ、ｍ
は自然数）(7) In an optical recording medium consisting of a recording layer having monomers and aggregates of a photochromic compound represented by the general formula below, the recording state due to the monomers and aggregates of a photochromic compound in the recording layer is detected by absorption. A recording state detection method characterized by: ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (However, R_1=-CH_2OCOC_nH_2_n_
+_1, R_2=-C_mH_2_m_+_1, n, m
is a natural number)
単量体及び会合体を有する記録層からなる光学記録媒体
において、記録層中のフォトクロミック化合物の単量体
と会合体による記録状態を蛍光によって検出することを
特徴とする記録状態の検出方法。 ▲数式、化学式、表等があります▼ （ただしＲ＿１＝−ＣＨ＿２ＯＣＯＣ＿ｎＨ＿２＿ｎ＿
＋＿１、Ｒ＿２＝−Ｃ＿ｍＨ＿２＿ｍ＿＋＿１、ｎ、ｍ
は自然数）(8) In an optical recording medium comprising a recording layer having monomers and aggregates of a photochromic compound represented by the general formula below, the recording state due to the monomers and aggregates of a photochromic compound in the recording layer is detected by fluorescence. A recording state detection method characterized by: ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (However, R_1=-CH_2OCOC_nH_2_n_
+_1, R_2=-C_mH_2_m_+_1, n, m
is a natural number)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63087259A JPH01259353A (en) | 1988-04-11 | 1988-04-11 | Optical recording medium and method for detecting recording state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63087259A JPH01259353A (en) | 1988-04-11 | 1988-04-11 | Optical recording medium and method for detecting recording state |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01259353A true JPH01259353A (en) | 1989-10-17 |
| JPH0470619B2 JPH0470619B2 (en) | 1992-11-11 |
Family
ID=13909776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63087259A Granted JPH01259353A (en) | 1988-04-11 | 1988-04-11 | Optical recording medium and method for detecting recording state |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01259353A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360699A (en) * | 1990-10-05 | 1994-11-01 | Matsushita Electric Industrial Co. Ltd. | Photochromic material and an optical storage medium using the same |
| US5399451A (en) * | 1991-03-14 | 1995-03-21 | Matsushita Electric Industrial Co., Ltd. | Optical recording medium and method for using the same |
| US5426018A (en) * | 1991-03-04 | 1995-06-20 | Matsushita Electric Industrial Co., Ltd. | Photochromic material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59215382A (en) * | 1983-05-20 | 1984-12-05 | Sony Corp | Photosensitive material |
| JPS62147456A (en) * | 1985-12-20 | 1987-07-01 | Matsushita Electric Ind Co Ltd | Optical recording medium |
| JPS62147454A (en) * | 1985-12-20 | 1987-07-01 | Matsushita Electric Ind Co Ltd | Optical recording medium |
-
1988
- 1988-04-11 JP JP63087259A patent/JPH01259353A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59215382A (en) * | 1983-05-20 | 1984-12-05 | Sony Corp | Photosensitive material |
| JPS62147456A (en) * | 1985-12-20 | 1987-07-01 | Matsushita Electric Ind Co Ltd | Optical recording medium |
| JPS62147454A (en) * | 1985-12-20 | 1987-07-01 | Matsushita Electric Ind Co Ltd | Optical recording medium |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360699A (en) * | 1990-10-05 | 1994-11-01 | Matsushita Electric Industrial Co. Ltd. | Photochromic material and an optical storage medium using the same |
| US5426018A (en) * | 1991-03-04 | 1995-06-20 | Matsushita Electric Industrial Co., Ltd. | Photochromic material |
| US5399451A (en) * | 1991-03-14 | 1995-03-21 | Matsushita Electric Industrial Co., Ltd. | Optical recording medium and method for using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0470619B2 (en) | 1992-11-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |