JPH01259354A - Optical recording medium and method for detecting recording state - Google Patents
Optical recording medium and method for detecting recording stateInfo
- Publication number
- JPH01259354A JPH01259354A JP63087260A JP8726088A JPH01259354A JP H01259354 A JPH01259354 A JP H01259354A JP 63087260 A JP63087260 A JP 63087260A JP 8726088 A JP8726088 A JP 8726088A JP H01259354 A JPH01259354 A JP H01259354A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- long
- optical recording
- chain
- monomer
- 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 16
- 238000000034 method Methods 0.000 title description 6
- 239000000178 monomer Substances 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 8
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 4
- 238000010521 absorption reaction Methods 0.000 claims abstract description 3
- 239000012528 membrane Substances 0.000 claims abstract 2
- 150000001875 compounds Chemical class 0.000 claims description 8
- 150000004668 long chain fatty acids Chemical class 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- 150000002148 esters Chemical class 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 150000001298 alcohols Chemical class 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 1
- 238000001514 detection method Methods 0.000 claims 1
- 150000002484 inorganic compounds Chemical class 0.000 claims 1
- 229910010272 inorganic material Inorganic materials 0.000 claims 1
- 238000002189 fluorescence spectrum Methods 0.000 abstract description 6
- 238000000862 absorption spectrum Methods 0.000 abstract description 4
- 206010056740 Genital discharge Diseases 0.000 abstract 1
- 239000010408 film Substances 0.000 description 10
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 230000001186 cumulative effect Effects 0.000 description 4
- 235000021355 Stearic acid Nutrition 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000008117 stearic acid Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 description 2
- 230000001678 irradiating effect 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
- 239000010453 quartz Substances 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
- 239000002253 acid Substances 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 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
- 230000000694 effects Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 description 1
- 229940038384 octadecane Drugs 0.000 description 1
- 239000008363 phosphate buffer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000005051 trimethylchlorosilane Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
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、波長の異なる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（特閏昭６１−２０５１８７号公報）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 (Japanese Patent Publication No. 205187/1987), no examples have been found of this being put to practical use.
発明が解決しようとする問題点
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. Only low density products can be obtained.
問題点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 comprising a recording layer having a monomer and an aggregate of one type of photochromic compound represented by the following general formula is formed.
（ただしＲはＣ＝１〜３１のアルキル鎖）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。(However, R is an alkyl chain with C=1 to 31.) Function 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
本発明の光学記録媒体は、上記一般式で示されフォトク
ロミック化合物の単量体及び会合体を用いるが、Ｒは、
原料が工業的に容易に人手できるＣ＝３１までの炭化水
素とする。好ましくはＣ＝１３からＣ＝２３までの炭化
水素で、親水性と疎水性のバランスが良く、容易にＬＢ
膜を形成できる。Examples The optical recording medium of the present invention uses monomers and aggregates of photochromic compounds represented by the above general formula, where R is
The raw material is a hydrocarbon up to C=31 that can be easily produced industrially. Preferably, it is a hydrocarbon from C=13 to C=23, which has a good balance between hydrophilicity and hydrophobicity and is easily LB.
Can form a film.
ただし、単量体は、単独膜、あるいは長鎖脂肪酸金属塩
、長鎖炭化水素のうちの１種以上の物質との混合膜を形
成するようにする。However, the monomer is used to form a single film or a mixed film with one or more substances selected from long-chain fatty acid metal salts and long-chain hydrocarbons.
さらに、会合体は、長鎖脂肪酸、長鎖アルコール、長鎖
エステルのうちの１種以上の物質との混合膜中で形成さ
れるようにする。Further, the aggregate is formed in a mixed film with one or more substances selected from long chain fatty acids, long chain alcohols, and long chain esters.
また、記録層閏に分離層をおいてもよい。Further, a separation layer may be provided between the recording layers.
記録状態の検出は吸収、蛍光によりおこなう。The recording state is detected by absorption and fluorescence.
実施例１
下記の構造で示されるスピロピラン（以下５Ｐ１８０１
と略す）を用いた。Example 1 Spiropyran shown by the following structure (hereinafter 5P1801
) was used.
ＳＰ １８０１とステアリン酸を共にベンゼンに１ｍＭ
の濃度に溶解した試料溶液を作製した。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１
８℃、圧縮速度：２０ ｍｎ＋／＋＋ ｉｎ、累積圧：
２０ｍＮ／ｎ＋）でＬＢ法により、石英基板に累積して
薄膜とした９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。このときの
膜構造は、親水基が全て基板の方向を向くようなＺ型に
なるように累積した。SP 1801 and stearic acid together in benzene at 1mM
A sample solution was prepared by dissolving the sample at a concentration of . This is carried out under normal conditions (subphase: pH 7/phosphate buffer, temperature 1
8°C, compression speed: 20 mn+/++ in, cumulative pressure:
9 The quartz substrate was made into a thin film by the LB method at 20 mN/n+) of trimethylchlorosilane.
% toluene solution for 10 minutes, and then washed with trichloroethane to make it hydrophobic in advance. The film structure at this time was accumulated in a Z-shape in which all the hydrophilic groups were directed toward the substrate.
また、層数は２層で膜厚は約５０Ａであった。このよう
にして作製した記録層を１とする。Further, the number of layers was two and the film thickness was about 50A. The recording layer produced in this manner is referred to as 1.
さらに、その上にＳＰ １８０１をベンゼンに１ｗ１Ｍ
の濃度になるように溶解したものを用いて、これをＬＢ
法により３層累積した。累積の際のサブフェーズ、水温
、圧縮速度、累積圧等の条件は、５Ｐ１８０１とステア
リン酸の混合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。Furthermore, on top of that, SP 1801 to benzene 1w1M
Using the solution dissolved to a concentration of LB
Three layers were accumulated according to the method. Conditions such as subphase, water temperature, compression speed, and cumulative pressure during accumulation are the same as those for the accumulation of a mixed film of 5P1801 and stearic acid. The recording layer produced in this manner is referred to as 2.
以上で得られた累積膜にレーザー光（λ＝３６０ｎｍ）
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Ｎ１．
２は各々にｓｐ ｉ ｓｏ ｉ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＝６００止）を照射することにより、蛍光ス
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
単量体く無色体）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＝ ６０
０ ｎｏｌ）を照射することにより、６００ ｎｍ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 = 360 nm) is applied to the cumulative film obtained above.
When irradiated with , the fluorescence spectrum became as shown in ■ in the figure. This is a state in which information has been erased, and record N1.
2, an aggregate (colored body) and a monomer (colored body) of sp i so i are formed. By irradiating this with a certain amount of laser light (λ=600), the fluorescence spectrum became as shown in (■) in the figure. This is recording layer 1
One piece of information is written on the recording medium, 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 = 60
By irradiating with 0 nol), 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＝３６０ｎｍ）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=360 nm).
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と同様の条件でＬＢ法により石英基板上にＳＰ
１８０１／ステアリン酸＝１／１の混合膜を２層累積
した。このようにして作製した記録層をユとする。Example 2 SP was deposited on a quartz substrate by the LB method under the same conditions as Example 1.
Two layers of 1801/stearic acid mixed films of 1/1 were accumulated. The recording layer produced in this manner is referred to as "Y".
この上に、ステアリン酸バリウム８層を（要用物質ニス
テアリン酸１ ｍＭベンゼン溶液、サブフェーズ： ｐ
Ｈ８，６／ＢａＣｌ２、ＫＨＣ（ｂ、温度１８℃、圧縮
速度： ２０ｍ＋ｍ／１Ｍ１ｎ、累積圧： ３０ｍＮ／
ｍ） Ｌ Ｂ法により累積し、さらにこのｔに、実施例
１と同じ条件で、ＳＰ １８０１／オクタデカン＝１／
３の混合膜をＬＢ法により３層累積した。このようにし
て作製した記録層を生とする。On top of this, 8 layers of barium stearate (required substance nistearic acid 1mM benzene solution, subphase: p
H8,6/BaCl2, KHC (b, temperature 18°C, compression speed: 20m+m/1M1n, cumulative pressure: 30mN/
m) Accumulated by the L B method, and further added to this t under the same conditions as Example 1, SP 1801/octadecane = 1/
Three layers of the mixed film of No. 3 were stacked by the LB method. The recording layer produced in this way is called raw.
得られた記録Ｎ、ｉ、生は実施例１と同様な書き込み、
消去の特性を示した。The obtained record N,i, the raw writing is the same as in Example 1,
It showed the characteristics of erasure.
実施例３
ＳＰ １８０１、ステアリルアルコールを共に３０ｍＭ
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旦とする。Example 3 SP 1801 and stearyl alcohol both 30mM
A recording layer was formed on one side of quartz glass treated in the same manner as in Example 1 by spin coding at 600 rpm for 60 seconds. The recording layer produced in this way is called a recording layer.
さらに、残ったもう一方の面に、やはり６００ｒｐｎ＋
で６０秒スピンコードすることにより、５Ｐ１８０１の
薄膜を形成した。こうして作製した記録層を旦とする。Furthermore, on the other side that remained, 600rpn+
A thin film of 5P1801 was formed by spin coding for 60 seconds. The recording layer produced in this way is called the recording layer.
溶液はＳＰ １８０１の３０ｍＭ）ルエン溶液を用いた
。The solution used was a 30mM toluene solution of SP 1801.
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
本発明によれば、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る。Effects of the Invention According to the present invention, it is possible to provide a rewritable optical recording medium that can record two or more states simply by using one photochromic compound.
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を示すグラフである。The figure is a graph showing fluorescence spectra in a writing state and an erasing state in one embodiment of the present invention.
Claims (7)
単量体及び会合体を有する記録層を備えた光学記録媒体
。 ▲数式、化学式、表等があります▼ （ただしＲはＣ＝１〜３１のアルキル鎖）(1) An optical recording medium comprising a recording layer containing 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 is an alkyl chain with C=1 to 31)
長鎖炭化水素のうちの１種以上の物質との混合膜を形成
してい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) The monomer is a single membrane or a long chain fatty acid metal salt,
2. The optical recording medium according to claim 1, wherein the optical recording medium forms a mixed film with one or more substances selected from long-chain hydrocarbons.
ステルのうちの１種以上の物質との混合膜中として形成
されてい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) The aggregate is formed as a mixed film with one or more substances selected from long-chain fatty acids, long-chain alcohols, and long-chain esters. optical recording medium.
と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 as an LB film.
長鎖アルコール、長鎖エステル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) Between the recording layers, a long chain fatty acid, a long chain fatty acid metal salt,
2. The optical recording medium according to claim 1, further comprising a separation layer consisting of a single film or a mixed film of long-chain alcohol or long-chain ester.
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を備えた光学記録媒体
における、前記フォトクロミック化合物の単量体と会合
体の記録状態を、吸収、または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はＣ＝１〜３１のアルキル鎖）(7) In an optical recording medium equipped with a recording layer having monomers and aggregates of a photochromic compound represented by the following general formula, the recorded state of the monomer and aggregates of the photochromic compound can be determined by absorption or fluorescence. A recording state detection method characterized by detecting. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (However, R is an alkyl chain with C=1 to 31)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63087260A JPH01259354A (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 |
|---|---|---|---|
| JP63087260A JPH01259354A (en) | 1988-04-11 | 1988-04-11 | Optical recording medium and method for detecting recording state |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01259354A true JPH01259354A (en) | 1989-10-17 |
| JPH0470620B2 JPH0470620B2 (en) | 1992-11-11 |
Family
ID=13909803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63087260A Granted JPH01259354A (en) | 1988-04-11 | 1988-04-11 | Optical recording medium and method for detecting recording state |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01259354A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59215382A (en) * | 1983-05-20 | 1984-12-05 | Sony Corp | Photosensitive material |
| JPS62147454A (en) * | 1985-12-20 | 1987-07-01 | Matsushita Electric Ind Co Ltd | Optical recording medium |
| JPS62147456A (en) * | 1985-12-20 | 1987-07-01 | Matsushita Electric Ind Co Ltd | Optical recording medium |
-
1988
- 1988-04-11 JP JP63087260A patent/JPH01259354A/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 |
| JPS62147454A (en) * | 1985-12-20 | 1987-07-01 | Matsushita Electric Ind Co Ltd | Optical recording medium |
| JPS62147456A (en) * | 1985-12-20 | 1987-07-01 | Matsushita Electric Ind Co Ltd | Optical recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0470620B2 (en) | 1992-11-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |