JPS6266993A - Optical recording medium - Google Patents

Optical recording medium

Info

Publication number
JPS6266993A
JPS6266993A JP60207629A JP20762985A JPS6266993A JP S6266993 A JPS6266993 A JP S6266993A JP 60207629 A JP60207629 A JP 60207629A JP 20762985 A JP20762985 A JP 20762985A JP S6266993 A JPS6266993 A JP S6266993A
Authority
JP
Japan
Prior art keywords
group
carbon atoms
recording medium
groups
alkyl group
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.)
Pending
Application number
JP60207629A
Other languages
Japanese (ja)
Inventor
Kazuhiro Enomoto
和弘 榎本
Kiyoshi Futaki
二木 清
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Paper Mills Ltd
Original Assignee
Mitsubishi Paper Mills Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Paper Mills Ltd filed Critical Mitsubishi Paper Mills Ltd
Priority to JP60207629A priority Critical patent/JPS6266993A/en
Publication of JPS6266993A publication Critical patent/JPS6266993A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242Record 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
    • G11B7/244Record 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
    • G11B7/246Record 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 containing dyes
    • G11B7/2463Record 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 containing dyes azulene

Landscapes

  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To obtain an org. compound suitable for forming a membrane as a recording layer by uniformly dissolving said compound in a solvent, by providing a membrane containing a specific azulene derivative compound on a substrate as a recording layer receiving thermal deformation by the irradiation of high-intensity energy light. CONSTITUTION:An azulene compound represented by formulae, I, II (wherein R1-R7 are a 1-12C alkyl group, an aryl group, an allyl group of halogen, R8-R13 are hydrogen, a 1-12C alkyl group, a 1-4C alkoxy group, a nitro group or halogen, A is hydrogen or a 1-12C alkyl group and X(-) is an anion residue) and used alone or by mixing with a binder when said compound is uniformly soluble in an org. solvent. As a substrate, plastics such as polyamide, paper, glass, etc. are used and the solution of the azulene derivative in the solvent is applied to the substrate to form a membrane.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は高密度エネルギー尤の照射にょ9熱変形を起す
光学記録媒体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 that undergoes thermal deformation upon irradiation with high-density energy.

(従来技術) 従来薄膜状の記録媒体にレーザー光などの高密度エネル
ギービームを照射して、照射部に分解、融解、蒸発、#
巣などの熱変形を起させ、その変形した部分の光学的特
性の変化を利用して、情報を記録する材料が知られてい
る0例えば、無機化合物系記録媒体としては、特公昭4
6−40479のようにゲルマニウム、ビスマス、テル
ルの三層から構成されるもの、特開昭56−27395
のようにテルル−2硫化炭素の混合系で得られるmil
+1を用いたものがある。一方、有機化合物系記録媒体
としては、特開昭55−108944のように窒化硫黄
ポリマーよりなる薄膜を記録媒体とする方法や、特開昭
56−46221のようにスクアリリウム塩色素ヲ記録
媒体として用いる方法や、特開昭55−97033のよ
うなフタロシアニン化合物や公表特公昭60−5003
28のようにポリメチン色素を光学記録媒体として用い
る方法などが知られている。
(Prior art) Conventionally, a thin film recording medium is irradiated with a high-density energy beam such as a laser beam, and the irradiated area undergoes decomposition, melting, evaporation, #
Materials that record information by causing thermal deformation such as cavities and utilizing changes in the optical properties of the deformed portions are known. For example, as an inorganic compound recording medium,
6-40479, which is composed of three layers of germanium, bismuth, and tellurium, JP-A-56-27395
mil obtained from a tellurium-carbon disulfide mixture system as shown in
There is one using +1. On the other hand, as an organic compound recording medium, there is a method in which a thin film made of sulfur nitride polymer is used as a recording medium as in JP-A-55-108944, and a method in which a squarylium salt dye is used as a recording medium as in JP-A-56-46221. methods, phthalocyanine compounds such as JP-A No. 55-97033, and publications such as JP-A No. 60-5003.
A method using a polymethine dye as an optical recording medium as shown in No. 28 is known.

しかしながら、従来の薄膜は、無機化合物のように真空
蒸着法あるいはスパッタリング法によってしか薄膜が得
られなかったり、あるいは有機化合物でも溶媒に対する
溶解度が低くて、真空蒸着法を用いなければ均一な薄膜
が得られないことが多く、有機溶媒に溶解させて溶液塗
45法で均−薄Mをえる方法はあまり知られていない。
However, with conventional thin films, thin films can only be obtained by vacuum evaporation or sputtering, such as with inorganic compounds, or with organic compounds, which have low solubility in solvents, and uniform thin films cannot be obtained without using vacuum evaporation. In many cases, it is not possible to obtain a uniform and thin M by dissolving it in an organic solvent and applying the solution coating method.

殊に半導体レーザーのように、長波長すなわち700〜
900nrnの波長域に大きな光吸収のある化合物で、
有機溶媒に均一溶解させて薄膜を形成させる化合物はあ
まり知られていない。溶媒に均一溶解させて、傅y4を
形成させる方法は経隣的メリットが大きいのでかかる化
合物の薄膜材料としての提供は産業玉料するところが大
きい。
Especially for long wavelengths such as semiconductor lasers, i.e. 700~
A compound with large light absorption in the 900nrn wavelength range,
Compounds that can be uniformly dissolved in organic solvents to form thin films are not well known. Since the method of uniformly dissolving the compound in a solvent to form Fuy4 has great advantages, the provision of such a compound as a thin film material is highly sought after by industry.

(発明の目的) 本発明者はかかる状況に檻み、溶媒に均−溶解させて記
録層としての薄fin形成させるに迩した有機化合物f
鋭意研究した結果本発明を完成したものである。
(Purpose of the Invention) The present inventors have discovered an organic compound f which can be homogeneously dissolved in a solvent to form a thin fin as a recording layer.
The present invention was completed as a result of intensive research.

(発明の構成) 即ち、本発明は高密度エネルギー元の照面により熱的変
形を受ける記録層として、一般式(r)(式中、几、〜
几、は水素、炭素数1〜12のアルキル基、シクロアル
キル基、アリール毫、アリル基、アラルキル基、メトキ
シ基、ハロゲン、/R −N%B/4、R8−R13は水素、炭′1g数1〜1
2のアルキル基、炭Xfll<1〜4のアルコキシ基、
ニトロ基、ハロケン、炭素e1.1〜4のカルボン酸エ
ステル基、シアノ基、α、α、α−トリフロロメチキ ル基、Ar/i水素、炭素数1〜12のアルチル基、炭
素数1〜4のアルコキシ基、ニトロ基、ハO)t’y、
炭素ax〜4のカルボン酸エステル基、シア/R ノ基、α、α、a−トリフロロメチル基、−NXR。
(Structure of the Invention) That is, the present invention provides a recording layer that is thermally deformed by the illumination surface of a high-density energy source, which is formed by the general formula (r) (where 几, ~
几 is hydrogen, alkyl group having 1 to 12 carbon atoms, cycloalkyl group, aryl group, allyl group, aralkyl group, methoxy group, halogen, /R -N%B/4, R8-R13 is hydrogen, carbon 1g number 1~1
2 alkyl group, carbon Xfl<1 to 4 alkoxy group,
Nitro group, halokene, carboxylic acid ester group with e1.1 to 4 carbon atoms, cyano group, α, α, α-trifluoromethyl group, Ar/i hydrogen, alkyl group with 1 to 12 carbon atoms, 1 to 4 carbon atoms 4 alkoxy group, nitro group, haO)t'y,
Carbon ax~4 carboxylic acid ester group, cyan/R no group, α, α, a-trifluoromethyl group, -NXR.

基、几、几′は水素、炭素数1〜4のアルキル基、アリ
ル基、置換基を含んでもよりアラルキル基、置換基を含
んでもよいアリール基であり、Xθけアニオン残基を表
わす。)で表わされるアズレン誘導体化合物を含む薄膜
を基板上に設けた光学記録媒体に関するものである。
The group, 几, and 几' are hydrogen, an alkyl group having 1 to 4 carbon atoms, an allyl group, an aralkyl group that may contain a substituent, an aryl group that may contain a substituent, and represent an anion residue at Xθ. This invention relates to an optical recording medium in which a thin film containing an azulene derivative compound represented by the following formula is provided on a substrate.

本発明で光学記録媒体として用いられるアズレン誘導体
化合物は、有機溶媒に均一溶解可能な場合には、単独で
用いてもよいし、バインダーとともに混合して用いるこ
ともできる。また、必要な場合VC?i上記化合物を溶
媒塗布法以外の薄膜形成法例えば真空蒸着法を用いても
よい。
The azulene derivative compound used as the optical recording medium in the present invention may be used alone or mixed with a binder if it can be uniformly dissolved in an organic solvent. Also, VC if necessary? i The above compound may be formed by a thin film forming method other than the solvent coating method, such as a vacuum evaporation method.

本発明に用いられる一般式(11で表わされる化合物と
しては例えば次の構造式を有するものが挙げられる。
Examples of the compound represented by the general formula (11) used in the present invention include those having the following structural formula.

例示化合物 に−1 に−2 すit3             シLす4に−6 に−7 011゜ に−13 に−15 に−17 に−19 に−21 本発明の光学記録媒体に用いられる基板としては、ポリ
メチルメタクリレート、ポリカーボネート、ポリアクリ
レート、ポリエステル、ポリアミドなどのプラスチック
類、紙、ガラス等、従来より知られている記録材料の基
板と同様のものが用いられる。これらの基板は必要な場
合には、基板の表面、裏面あるいは中間層に金属反射層
を設けることができる。金属反射層としては、Aノ、T
i。
Exemplary compounds -1 -2 -6 -7 011° -13 -15 -17 -19 -21 The substrates used in the optical recording medium of the present invention include: The same materials as substrates for conventionally known recording materials can be used, such as plastics such as polymethyl methacrylate, polycarbonate, polyacrylate, polyester, and polyamide, paper, and glass. These substrates can be provided with a metal reflective layer on the front surface, back surface, or intermediate layer of the substrate, if necessary. As the metal reflective layer, A, T
i.

Te、 Ri、 Rh、  あるいはAgの薄膜が使用
され、材料の選択は、価格、安定性、作業性、物理光学
的特性などによって決壕る。
Thin films of Te, Ri, Rh, or Ag are used, and the material selection depends on factors such as price, stability, workability, and physico-optical properties.

本発明に用いられる記録媒体のl−膜形成方法としては
、溶媒に溶解させて塗布する方法の他、スピンコード法
、キャスト法、ディッピング法、バー!−ト法、ロール
コート法などによす行イ、溶媒を蒸発させて411g全
形成させる。また、場合によっては真空蒸着法で薄膜を
形成させることもできる。溶媒に溶解させて塗布する場
合には、本発明の記au体を単独で溶解させてもよいし
、またポリマーをバインダーとして用いてもよい0溶媒
としてはアセトン、メチルエチルケトンなどのケトン類
、テトラヒドロフラン、ジオキサンなどのエーテル類、
トルエン、キシレン、ベンゼンなどの芳香族炭化水素類
、クロロホルム、ジクロルエタンなどのハロゲン化炭化
水素類、アセトニトリル、プロピオニトリルなどのニト
リル化合物、などが使用される。
Methods for forming the L-film on the recording medium used in the present invention include a method of dissolving it in a solvent and applying it, as well as a spin code method, a casting method, a dipping method, and a bar! The solvent is evaporated to form a total of 411 g. In some cases, a thin film can also be formed by vacuum evaporation. When applied after being dissolved in a solvent, the au form of the present invention may be dissolved alone, or a polymer may be used as a binder.Solvents include acetone, ketones such as methyl ethyl ketone, tetrahydrofuran, Ethers such as dioxane,
Aromatic hydrocarbons such as toluene, xylene and benzene, halogenated hydrocarbons such as chloroform and dichloroethane, nitrile compounds such as acetonitrile and propionitrile, and the like are used.

バインダーとしては、ニトロセルロース、アセチルセル
ロース、ポリカーボネート、ポリメタクリル酸エステル
、ポリアクリル酸エステル、ポリビニルブチラール、ポ
リスチレン、ポリ塩化ビニル、塩化ビニル:酢酸ビニル
共重合体、メラミン樹脂ボリアリレート、エポキシ樹脂
、ポリエステル樹脂などである。
As a binder, nitrocellulose, acetylcellulose, polycarbonate, polymethacrylic acid ester, polyacrylic acid ester, polyvinyl butyral, polystyrene, polyvinyl chloride, vinyl chloride: vinyl acetate copolymer, melamine resin polyarylate, epoxy resin, polyester resin etc.

また、真空蒸着法による薄膜形成法では10−6〜10
−’Torrで200〜500℃に加熱することにより
得られる。
In addition, in the thin film formation method using vacuum evaporation method, 10-6 to 10
-'Torr by heating to 200-500°C.

このようにして得られた光学記録媒体の薄膜上に保護層
として、透明な薄膜を形成させて用いてもよい。
A transparent thin film may be formed as a protective layer on the thin film of the optical recording medium thus obtained.

このような保護ノーに用いられるポリマーとしては、透
明であればよく、前記のようなポリマーの14膜を上1
−に形成させることにより、用いてもよい。
The polymer used for such protection may be transparent as long as it is transparent.
- You may use it by making it form.

本発明の記録媒体に用いるレーザー元は、アズレン誘導
体化合物の吸収波長に適する波長が好ましく、それぞれ
の化合物に応じてN、レーザー、He−Neレーザー、
ルビーレーザー、色素レーザー、半導体レーザーから選
択される。
The laser source used in the recording medium of the present invention preferably has a wavelength suitable for the absorption wavelength of the azulene derivative compound, and depending on each compound, N, laser, He-Ne laser,
Selected from ruby laser, dye laser, and semiconductor laser.

(実施例) 以下に実施例を挙げて本発明を説明するが、本発明の範
囲はこれに限定されるものではない。
(Example) The present invention will be described below with reference to Examples, but the scope of the present invention is not limited thereto.

実施例1゜ 本発明の光学記録媒体として例示化合物に−2:3−ビ
ス(N、N−ジメチルアミノフェニル)アクリチン−1
,4−ジメチル−7−インプロピルアズレニウムバーク
ロレートを用いた。この化合物の吸収スペクトルを測定
するために、エタノールを溶奴として溶解させ、分光光
If計(呂律製uv−3000)により測定した。長波
長領域における吸収スペクトルはλmaxが726nm
で、モル吸−九係叔が6.5X10’であった〇ポリカ
ーボネート樹脂製円板(直径50JEI、厚さ1鵡)上
に塗布するために、上記媒体のジメチルホルムアミド溶
液をfJ!4製した。10’Fの例示化合物に一2’(
(ジメチルホルムアミド200 ml中に加え、均一溶
液とした後に、クリーンルーム中でスピナーを用いて回
転塗布を行なった。尚、スピナーの回転数は4000 
rpmで10秒間回転させた。70℃で1時間真空乾燥
を行ない、後にl!u+厚測定を行なうと0.16a”
の膜厚であった。780nmに於ける吸光度をUV−3
65(呂律製分元光度計)により測定すると0.68で
あった。
Example 1 -2:3-bis(N,N-dimethylaminophenyl)acritin-1 as an exemplary compound as an optical recording medium of the present invention
, 4-dimethyl-7-inpropyl azulenium verchlorate was used. In order to measure the absorption spectrum of this compound, it was dissolved in ethanol as a melt, and measured using a spectrophotometer (UV-3000 manufactured by Lu Li). The absorption spectrum in the long wavelength region has a λmax of 726 nm.
So, in order to apply the dimethylformamide solution of the above medium on a polycarbonate resin disk (diameter 50 JEI, thickness 1 inch) whose molar absorption ratio was 6.5 x 10', fJ! 4 were made. 12'(
(After adding it to 200 ml of dimethylformamide to make a homogeneous solution, it was applied by rotation using a spinner in a clean room.The number of rotations of the spinner was 4000.
Rotate for 10 seconds at rpm. Vacuum drying was performed at 70°C for 1 hour, followed by l! U+ thickness measurement is 0.16a"
The film thickness was . UV-3 absorbance at 780 nm
It was 0.68 when measured with 65 (Spectrophotometer manufactured by Ro Ritsu).

記録媒体としての性能は、780nmの半導体レーザー
を用いて行なった。出力は10 m W、 パルスの発
振時間は10μ秒、ビーム径は06μ謂であったO 記録媒体を塗布したディスクをDCモーターで5 rp
@の速度で回転させながら、上記条件でレーザー元を照
射したところ、リードアウト記号に変化が起9、信号が
書きこまれたことが確認された。
Performance as a recording medium was tested using a 780 nm semiconductor laser. The output was 10 mW, the pulse oscillation time was 10 μs, and the beam diameter was 0.6 μm. The disk coated with the recording medium was rotated at 5 rp with a DC motor.
When the laser source was irradiated under the above conditions while rotating at a speed of @, a change occurred in the readout symbol9, confirming that a signal had been written.

実施例2゜ 本発明の光学記録媒体として下記構造式で示される。Example 2゜ The optical recording medium of the present invention is represented by the following structural formula.

3−ビス(N、N−ジエチルアミノフェニル)フロパン
クイリデン−1,4−ジメチル−7−イツブロビルーア
ズレニウムテトラフロロボレートを用いた。この化合物
の吸収スペクトルをアセトニトリル中で測定した所73
2nmでモル吸光係数が7.lX10’  であった。
3-bis(N,N-diethylaminophenyl)furopaneylidene-1,4-dimethyl-7-itubroby-azulenium tetrafluoroborate was used. The absorption spectrum of this compound was measured in acetonitrile.73
The molar extinction coefficient at 2 nm is 7. It was lX10'.

実施例1と同様の方法でメタクリル樹脂製ディスク上に
塗布し、0.14amのl1iJを形成させた。
It was applied onto a methacrylic resin disk in the same manner as in Example 1 to form l1iJ of 0.14 am.

このディスクの7801mにおける吸光度は0.63で
あった。
The absorbance of this disk at 7801 m was 0.63.

実施例1と同様にして780nmの半導体レーザーを用
いて光照射による畜き込みを灯なった所す−ドアウト1
g号VC変化が起った。
In the same manner as in Example 1, a 780-nm semiconductor laser was used to light up the trap by light irradiation.
No.g VC change has occurred.

実施例3゜ K−13のアズレン訪導体を用いた以外、実施例1とま
ったく同様の方法で光記録媒体をディスク上に作成した
。このものの830nmに於ける吸光度をUV−365
により測定すると0.82であった。
Example 3 An optical recording medium was prepared on a disk in exactly the same manner as in Example 1, except that an azulene conductor of K-13 was used. The absorbance of this material at 830 nm is UV-365.
It was 0.82 when measured by.

記録媒体としての性能は、830nmの半導体レーザー
を用いて行なった。このディスクを出力lQmW、パル
スの発(辰時間10〃秒、ビーム径0.5Qamでレー
ザー元を照射したところ、リードアウト信号に変化が起
り、信号が賽きこまれたことが確認された〇 尚、このディスクの可視光における最大吸光波長は81
0nm付近にあり、全体としてブロードな吸収カーブを
有していた。
Performance as a recording medium was tested using an 830 nm semiconductor laser. When this disk was irradiated with a laser source with an output of 1QmW, a pulse emission (duration time of 10 seconds, and a beam diameter of 0.5Qam), a change occurred in the readout signal, confirming that the signal was inserted. , the maximum absorption wavelength of this disc in visible light is 81
It was around 0 nm, and had a broad absorption curve as a whole.

Claims (2)

【特許請求の範囲】[Claims] (1)高密度エネルギー光の照射により熱的変形を受け
る記録層として、一般式( I ) ▲数式、化学式、表等があります▼ (式中、R_1〜R_7は水素、炭素数1〜12のアル
キル基、シクロアルキル基、アリール基、アリル基、ア
ラルキル基、メトキシ基、ハロゲン、▲数式、化学式、
表等があります▼基、R_8〜R_1_3は水素、炭素
数1〜12のアルキル基、炭素数1〜4のアルコキシ基
、ニトロ基、ハロゲン、炭素数1〜4のカルボン酸エス
テル基、シアノ基、α,α,α−トリフロロメチル基、
Aは水素、炭素数1〜12のアルキル基、炭素数1〜4
のアルコキシ基、ニトロ基、ハロゲン、炭素数1〜4の
カルボン酸エステル基、シアノ基、α,α,α−トリフ
ロロメチル基、 ▲数式、化学式、表等があります▼基、R、R′は水素
、炭素数1〜4のアルキル基、アリル基、置換基を含ん
でもよいアラルキル基、置換基を含んでもよいアリール
基であり、X^■はアニオン残基を表わす。)で表わさ
れるアズレン誘導体化合物を含む薄膜を基板上に設けた
光学記録媒体。
(1) As a recording layer that undergoes thermal deformation by irradiation with high-density energy light, there are general formulas (I) ▲ mathematical formulas, chemical formulas, tables, etc. Alkyl group, cycloalkyl group, aryl group, allyl group, aralkyl group, methoxy group, halogen, ▲mathematical formula, chemical formula,
There are tables, etc. ▼ group, R_8 to R_1_3 are hydrogen, alkyl group with 1 to 12 carbon atoms, alkoxy group with 1 to 4 carbon atoms, nitro group, halogen, carboxylic acid ester group with 1 to 4 carbon atoms, cyano group, α, α, α-trifluoromethyl group,
A is hydrogen, an alkyl group having 1 to 12 carbon atoms, and 1 to 4 carbon atoms.
Alkoxy groups, nitro groups, halogens, carboxylic acid ester groups with 1 to 4 carbon atoms, cyano groups, α, α, α-trifluoromethyl groups, ▲Mathical formulas, chemical formulas, tables, etc.▼groups, R, R' represents hydrogen, an alkyl group having 1 to 4 carbon atoms, an allyl group, an aralkyl group which may contain a substituent, and an aryl group which may contain a substituent, and X^■ represents an anion residue. ) An optical recording medium comprising a thin film containing an azulene derivative compound represented by:
(2)前記一般式( I )で示されるアズレン誘導体化
合物が下記構造式で示される化合物である特許請求の範
囲第1項記載の光学記録媒体。 ▲数式、化学式、表等があります▼ (式中、R、R′、A、X^■第1項と同義である。)
(2) The optical recording medium according to claim 1, wherein the azulene derivative compound represented by the general formula (I) is a compound represented by the following structural formula. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, R, R', A, X^■ are synonymous with the first term.)
JP60207629A 1985-09-18 1985-09-18 Optical recording medium Pending JPS6266993A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60207629A JPS6266993A (en) 1985-09-18 1985-09-18 Optical recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60207629A JPS6266993A (en) 1985-09-18 1985-09-18 Optical recording medium

Publications (1)

Publication Number Publication Date
JPS6266993A true JPS6266993A (en) 1987-03-26

Family

ID=16542958

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60207629A Pending JPS6266993A (en) 1985-09-18 1985-09-18 Optical recording medium

Country Status (1)

Country Link
JP (1) JPS6266993A (en)

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