JPH0452792B2 - - Google Patents
Info
- Publication number
- JPH0452792B2 JPH0452792B2 JP60047197A JP4719785A JPH0452792B2 JP H0452792 B2 JPH0452792 B2 JP H0452792B2 JP 60047197 A JP60047197 A JP 60047197A JP 4719785 A JP4719785 A JP 4719785A JP H0452792 B2 JPH0452792 B2 JP H0452792B2
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- recording
- light
- optical recording
- dyes
- 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
- 230000003287 optical effect Effects 0.000 claims description 20
- 239000000975 dye Substances 0.000 claims description 19
- 230000031700 light absorption Effects 0.000 claims description 7
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 238000000862 absorption spectrum Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XKWQNWOHLZAFPS-UHFFFAOYSA-N 1,1',3,3'-tetraethyl-5,5',6,6'-tetrachloroimidacarbocyanine Chemical compound CCN1C2=CC(Cl)=C(Cl)C=C2N(CC)C1=CC=CC1=[N+](CC)C2=CC(Cl)=C(Cl)C=C2N1CC XKWQNWOHLZAFPS-UHFFFAOYSA-N 0.000 description 1
- MHQOURYMHSSLDM-UHFFFAOYSA-M 1,1'-diethyl-2,2'-cyanine chloride Chemical compound [Cl-].C1=CC2=CC=CC=C2N(CC)C1=CC1=CC=C(C=CC=C2)C2=[N+]1CC MHQOURYMHSSLDM-UHFFFAOYSA-M 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004528 spin coating Methods 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
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
-
- 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
-
- 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
- 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
- G11B7/246—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 containing dyes
- G11B2007/24612—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 containing dyes two or more dyes in one layer
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は光学式情報記録装置に用いられる光学
記録媒体、特に１ケ所に複数ビツトの情報記録が
可能な光学式三次元情報記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical recording medium used in an optical information recording device, and particularly to an optical three-dimensional information recording medium capable of recording information of a plurality of bits at one location.
従来の技術
従来光学式情報記録媒体としては、基板上に記
録層を被覆し、微細なレーザー光線を照射するこ
とによりレーザー光線の熱又は光の作用で、記録
層に穴の形成，結晶構造の変化あるいは化学変化
を起こす方式のものが用いられてきた。Conventional technology In conventional optical information recording media, a recording layer is coated on a substrate, and a fine laser beam is irradiated to form holes in the recording layer, change the crystal structure, or Methods that cause chemical changes have been used.
上記のいずれの記録方式についても、レーザー
光線が照らす最少面積単位につき１ビツトの情報
しか記録することができない。これに対し、光吸
収波長領域が異なる複数種類の色素からなる記録
層を設けることによつて、複数ビツトの情報を同
一箇所に記録する方式、いわゆる光学式三次元情
報記録方式がある。（例えば、特開昭59−152528
号公報）
発明が解決しようとする問題点
しかしながら、通常の色素は巾広い光吸収帯域
を持つており、数種類積層すると吸収帯が重なる
ためある波長領域において識別可能な色素の数、
すなわち１箇所に記録可能な情報の数はわずかな
ものしか得られなかつた。 In any of the above recording methods, only one bit of information can be recorded per smallest area unit illuminated by the laser beam. On the other hand, there is a so-called optical three-dimensional information recording method, which records multiple bits of information at the same location by providing a recording layer made of multiple types of dyes having different light absorption wavelength regions. (For example, JP-A-59-152528
Problems to be Solved by the Invention However, ordinary dyes have a wide light absorption band, and when several types of dyes are stacked, their absorption bands overlap, so the number of dyes that can be identified in a certain wavelength range,
In other words, only a small amount of information can be recorded at one location.
問題点を解決するための手段
本願発明は、光吸収波長領域がそれぞれ異なつ
た少なくとも２種類以上の会合体形成色素を同じ
層あるいは異なつた層に有することを特徴とする
光学記録媒体を提供するものである。Means for Solving the Problems The present invention provides an optical recording medium characterized by having at least two types of aggregate-forming dyes having different light absorption wavelength regions in the same layer or in different layers. It is.
作 用
会合体形成色素は、通常の色素と比較して半値
幅が狭くなる性質を持つ。この性質を光学式三次
元情報記録媒体に利用することにより、同じ波長
領域において独立な記録が可能な色素の種類を向
上させることが可能になる。すなわち１箇所に記
録可能な情報量を増大させることが可能になる。Effect Aggregate-forming dyes have the property of having a narrower half-width than normal dyes. By utilizing this property in an optical three-dimensional information recording medium, it becomes possible to increase the types of dyes that can perform independent recording in the same wavelength region. In other words, it becomes possible to increase the amount of information that can be recorded in one location.
実施例
シアニン類などの色素には、各種の会合体を形
成して光吸収の最大吸収波長および吸収帯の巾に
変化を起こすものがある。この様な会合体の中で
もＪ会合体は長波長側に非常に鋭敏な吸収帯があ
らわれ本発明に有効である。Examples Some pigments such as cyanines form various aggregates and cause changes in the maximum light absorption wavelength and the width of the absorption band. Among such aggregates, J aggregates have a very sharp absorption band on the long wavelength side and are effective in the present invention.
なお、本発明においてＪ会合体とは、単量体の
色素より長波長側に著しく幅の狭い光吸収を示す
ものをいう。Ｊ会合体に対して単量体の色素より
短波長側に光吸収を示すものはＨ会合体と定義さ
れている（例えば、有機エレクトロニクス材料研
究会第27回研究講演要旨集第１〜第10頁）。 In the present invention, the J-aggregate refers to one that exhibits a significantly narrower light absorption on the longer wavelength side than the monomeric dye. J-aggregates that exhibit light absorption at shorter wavelengths than monomeric dyes are defined as H-aggregates (for example, Organic Electronics Materials Research Group 27th Research Lecture Abstracts Volumes 1 to 10). page).
以下図面を用いて本発明の実施例について説明
する。第１図は本発明の実施例である光学記録媒
体の構成図である。１は基板である。２〜５は記
録層であり、第１記録層２は１，1′−ジエチル−
２，2′−シアニンクロリド，第２記録層３は５，
5′，６，6′−テトラクロロ−１，1′，３，3′−テ
トラエチルベンズイミダゾロカルボシアニンクロ
リド，第３記録層４は５，5′−ジクロロ−３，
3′，９−トリエチルチアカボシアニンクロリド，
第４記録層５は６，6′−ジクロロ−３，3′−ジエ
チルチアカルボシアニンクロリドをそれぞれいず
れも0.02モル／の水溶液とし、これらに硫酸カ
リウム0.01モル／水溶液を徐々に加えて各々最
も光吸収帯の巾が狭くなる様にした溶液をゼラチ
ンでゲル化し、基板１の上に順次スピンコートで
積層したものである。６は保護膜である。このよ
うにして作成した光学記録媒体の記録層２〜５で
はいずれも色素がＪ会合した。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an optical recording medium according to an embodiment of the present invention. 1 is a substrate. 2 to 5 are recording layers, and the first recording layer 2 is 1,1'-diethyl-
2,2′-cyanine chloride, second recording layer 3 is 5,
5',6,6'-tetrachloro-1,1',3,3'-tetraethylbenzimidazolocarbocyanine chloride, the third recording layer 4 is 5,5'-dichloro-3,
3',9-triethylthiacabocyanine chloride,
The fourth recording layer 5 was prepared by forming an aqueous solution of 6,6'-dichloro-3,3'-diethylthiacarbocyanine chloride at a concentration of 0.02 mol/aqueous solution, and gradually adding a 0.01 mol/aqueous solution of potassium sulfate to each of them to obtain the highest light. A solution in which the width of the absorption band is narrowed is gelatinized with gelatin, and the solution is sequentially laminated on the substrate 1 by spin coating. 6 is a protective film. In all of the recording layers 2 to 5 of the optical recording medium thus prepared, the dyes were J-associated.
第２図は記録層２〜５の可視吸収スペクトルで
あり、各層に対応してA2，A3，A4，A5で示され
る。各ピークの強度は説明の簡便さのためそろえ
て示した。A2〜A5の最大吸収波長はそれぞれ
570，590，620，640nm付近であり、吸収帯の半
値巾はいずれも約20nmであつた。 FIG. 2 shows visible absorption spectra of recording layers 2 to 5, indicated by A 2 , A 3 , A 4 , and A 5 corresponding to each layer. The intensities of each peak are shown together for ease of explanation. The maximum absorption wavelengths of A 2 to A 5 are respectively
The absorption bands were around 570, 590, 620, and 640 nm, and the half-width of each absorption band was about 20 nm.
第３図はＪ会合しない状態の色素本来の可視吸
収スペクトルを示したもので、A2〜A5に対応し
てB2〜B5で示されている。第２図と第３図を比
較すると明らかなように、記録層２〜５の吸収領
域は本来互いに重なりあつて判別不可能であつた
ものが、Ｊ会合することにより明確に分離してい
る。つまりそれぞれの層が選択的に吸収する波長
領域を個別に有するようになつた。この様な特性
を有する本発明の光学記録媒体を用いた情報記録
について、その構成を以下記述する。 FIG. 3 shows the original visible absorption spectrum of the dye in a non-J-associated state, where B2 to B5 correspond to A2 to A5 . As is clear from a comparison of FIG. 2 and FIG. 3, the absorption regions of recording layers 2 to 5, which originally overlapped each other and were indistinguishable, are now clearly separated by J-convergence. In other words, each layer now has its own wavelength range that it selectively absorbs. The configuration of information recording using the optical recording medium of the present invention having such characteristics will be described below.
第４図は本発明の光学記録媒体を用いるための
情報記録再生システムの構成図である。７は第１
図に示したものと同様の光学記録媒体であり、記
録層は会合した状態である。８〜１１は光源でそ
れぞれ570，590，620，640nm付近の波長の光を
選択的に発し、いずれも入力信号により個別に
ON−OFFする。１２は集光器で、光源８〜１１
より発した光線を１本にして、回転する光学記録
媒体７の上に集光する。１３はプリズムからなる
分波器で、光学記録媒体７を通過した光線を波長
毎に分配して、元の４本の光線とする。１４〜１
７はセンサーで、分波器１３が発した４本の光線
を受けて、それぞれ独立して電気信号に変換す
る。以下動作を説明する。 FIG. 4 is a block diagram of an information recording/reproducing system for using the optical recording medium of the present invention. 7 is the first
An optical recording medium similar to that shown in the figure, with the recording layers in an assembled state. Numerals 8 to 11 are light sources that selectively emit light with wavelengths around 570, 590, 620, and 640 nm, respectively, and each can be individually controlled depending on the input signal.
Turn on and off. 12 is a concentrator, and light sources 8 to 11
The light beams emitted from the two are combined into one beam and focused onto the rotating optical recording medium 7. Reference numeral 13 denotes a demultiplexer made of a prism, which divides the light beam that has passed through the optical recording medium 7 into wavelengths to form four original light beams. 14-1
A sensor 7 receives the four light beams emitted by the splitter 13 and converts them into electrical signals independently. The operation will be explained below.
(a) 記録
いま、仮に第１記録層２と第２記録層３のみを
“１”にしたいとする。このときは光源８と９を
ONにし、１０と１１をOFFとする。この様な光
線が当たつた瞬間に、記録層のうち、第１及び第
２記録層２，３のみは光線が当たつた部分だけ熱
を発し、色素が分解して吸収をもたなくなる。つ
まり、２と３のみに“１”が記録される。(a) Recording Now, suppose we want to set only the first recording layer 2 and the second recording layer 3 to "1". At this time, light sources 8 and 9 are
Turn ON, and turn 10 and 11 OFF. At the moment when such a light beam hits, only the first and second recording layers 2 and 3 of the recording layer generate heat in the portions hit by the light beam, and the dye decomposes and ceases to have absorption. In other words, "1" is recorded only in 2 and 3.
(b) 再生
光源８〜１１を全て書きこみの時の1/10の強度
で同時に照射した。各記録層で色素が分解してい
るか否かに応じて、各記録層に対応する波長の透
過光の強度に変化が生じ、これをセンサー１４〜
１７によつて４ビツトの電気信号として取り出す
ことができた。(b) Reproduction All light sources 8 to 11 were irradiated simultaneously at 1/10 the intensity of writing. Depending on whether or not the dye is decomposed in each recording layer, the intensity of the transmitted light of the wavelength corresponding to each recording layer changes, and this is detected by the sensor 14.
17, it was possible to extract it as a 4-bit electrical signal.
以上説明したように本発明を実施することによ
つて、570〜640nmという狭い波長領域において、
４ビツトを単独に記録・再生することが可能とな
つた。 By implementing the present invention as explained above, in the narrow wavelength range of 570 to 640 nm,
It became possible to record and reproduce 4 bits independently.
なお、本発明においては記録の原理に色素の分
解を用いて説明したが、他に、記録層の穴の形
成、ホトクロミズムその他の化学変化を用いても
さしつかえない。また、本発明の実施例ではゲル
化した、いわゆる湿式の状態で説明したが、他に
色素を揮発性溶媒に溶解してコーテイングした後
溶媒を乾燥させたり、LB膜法などで作成した、
いわゆる乾式であつても本発明と本質的に同様で
ある。さらに、本発明では透過光により、再生を
行なつたが、これが反射光あるいはけい光であつ
ても同様である。 Although the present invention has been described using the decomposition of dye as the principle of recording, it is also possible to use other chemical changes such as the formation of holes in the recording layer, photochromism, and others. In addition, although the embodiments of the present invention have been described in a gelled, so-called wet state, other methods include dissolving the dye in a volatile solvent and coating it and then drying the solvent, or using the LB film method, etc.
Even if it is a so-called dry method, it is essentially the same as the present invention. Further, in the present invention, reproduction is performed using transmitted light, but the same applies even if this is reflected light or fluorescent light.
また、複数種の材料を各々異なる層として構成
したが、一層を複数種の材料で構成することも可
能である。 Furthermore, although a plurality of types of materials are configured as different layers, it is also possible to configure one layer with a plurality of types of materials.
発明の効果
本発明を実施することにより、１箇所に記録可
能な情報のビツト数を著しく増大することが可能
となり、実用上の効果は多大なものが期待され
る。Effects of the Invention By carrying out the present invention, it becomes possible to significantly increase the number of bits of information that can be recorded in one location, and great practical effects are expected.
第１図は本発明の光学記録媒体の構成を示す断
面図、第２図は同実施例の各記録層の可視吸収ス
ペクトル、第３図は同実施例の各記録材料のＪ会
合していない状態での可視吸収スペクトル、第４
図は同実施例光学記録媒体を用いた情報記録再生
システムの１例を示す構成図である。
１……基板、２〜５……記録層、７……光学記
録媒体、８〜１１……光源、１２……集光器、１
３……分波器、１４〜１７……センサー。
FIG. 1 is a cross-sectional view showing the structure of the optical recording medium of the present invention, FIG. 2 is a visible absorption spectrum of each recording layer of the same example, and FIG. 3 is a non-J-aggregated recording material of the same example. Visible absorption spectrum in state, 4th
The figure is a configuration diagram showing an example of an information recording/reproducing system using the optical recording medium of the same embodiment. DESCRIPTION OF SYMBOLS 1... Substrate, 2-5... Recording layer, 7... Optical recording medium, 8-11... Light source, 12... Concentrator, 1
3... splitter, 14-17... sensor.
Claims (1)
も２種類以上の色素の会合体を同じ層あるいは異
なつた層に有することを特徴とする光学記録媒
体。 ２ 会合体がＪ会合体であ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 会合体形成色素がシアニン色素であることを
特徴とする特許請求の範囲第２項記載の光学記録
媒体。[Scope of Claims] 1. An optical recording medium characterized by having aggregates of at least two or more types of dyes having different light absorption wavelength regions in the same layer or in different layers. 2. The optical recording medium according to claim 1, wherein the aggregate is a J aggregate. 3. The optical recording medium according to claim 2, wherein the aggregate-forming dye is a cyanine dye.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60047197A JPS61205187A (en) | 1985-03-08 | 1985-03-08 | Photo-recording medium and method |
| EP86102848A EP0193931B1 (en) | 1985-03-06 | 1986-03-05 | Optical high density recording mediums, method for making same and method for recording optical information in the medium |
| DE3689891T DE3689891T2 (en) | 1985-03-06 | 1986-03-05 | High density optical recording media, methods of making the same and methods for recording optical information in this medium. |
| US06/836,625 US4737427A (en) | 1985-03-06 | 1986-03-05 | Optical high density recording mediums, method for making same and method for recording optical information in the medium |
| US07/145,686 US4845021A (en) | 1985-03-06 | 1988-01-14 | Method for recording optical information in optical high density recording mediums |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60047197A JPS61205187A (en) | 1985-03-08 | 1985-03-08 | Photo-recording medium and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61205187A JPS61205187A (en) | 1986-09-11 |
| JPH0452792B2 true JPH0452792B2 (en) | 1992-08-24 |
Family
ID=12768400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60047197A Granted JPS61205187A (en) | 1985-03-06 | 1985-03-08 | Photo-recording medium and method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61205187A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0260976A (en) * | 1988-08-29 | 1990-03-01 | Pentel Kk | Ink for optical information recording medium |
| JPH0569671A (en) * | 1991-09-13 | 1993-03-23 | Nec Corp | Multivalue optical recording medium and reader thereof |
| TW453944B (en) * | 1998-11-02 | 2001-09-11 | Rohm & Amp Haas Company | High quality plastic sheet, apparatus for producing same and their optical and electronic display applications |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58105442A (en) * | 1981-12-16 | 1983-06-23 | Ricoh Co Ltd | Optical memory medium |
| JPS58112790A (en) * | 1981-12-28 | 1983-07-05 | Ricoh Co Ltd | Optical information recording medium |
| JPS58114989A (en) * | 1982-12-06 | 1983-07-08 | Ricoh Co Ltd | Light information recording member |
| JPS58219091A (en) * | 1982-06-14 | 1983-12-20 | Canon Inc | Optical recording medium |
| JPS5978341A (en) * | 1982-10-28 | 1984-05-07 | Ricoh Co Ltd | Optical information recording medium |
| JPS5981194A (en) * | 1982-11-01 | 1984-05-10 | Tdk Corp | Optical information medium |
| JPS59152528A (en) * | 1983-02-18 | 1984-08-31 | Fujitsu Ltd | Optical recorder |
| JPS60204396A (en) * | 1984-03-29 | 1985-10-15 | Tdk Corp | Optical recording medium |
-
1985
- 1985-03-08 JP JP60047197A patent/JPS61205187A/en active Granted
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58105442A (en) * | 1981-12-16 | 1983-06-23 | Ricoh Co Ltd | Optical memory medium |
| JPS58112790A (en) * | 1981-12-28 | 1983-07-05 | Ricoh Co Ltd | Optical information recording medium |
| JPS58219091A (en) * | 1982-06-14 | 1983-12-20 | Canon Inc | Optical recording medium |
| JPS5978341A (en) * | 1982-10-28 | 1984-05-07 | Ricoh Co Ltd | Optical information recording medium |
| JPS5981194A (en) * | 1982-11-01 | 1984-05-10 | Tdk Corp | Optical information medium |
| JPS58114989A (en) * | 1982-12-06 | 1983-07-08 | Ricoh Co Ltd | Light information recording member |
| JPS59152528A (en) * | 1983-02-18 | 1984-08-31 | Fujitsu Ltd | Optical recorder |
| JPS60204396A (en) * | 1984-03-29 | 1985-10-15 | Tdk Corp | Optical recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61205187A (en) | 1986-09-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |