JPH0470159B2 - - Google Patents
Info
- Publication number
- JPH0470159B2 JPH0470159B2 JP56108894A JP10889481A JPH0470159B2 JP H0470159 B2 JPH0470159 B2 JP H0470159B2 JP 56108894 A JP56108894 A JP 56108894A JP 10889481 A JP10889481 A JP 10889481A JP H0470159 B2 JPH0470159 B2 JP H0470159B2
- Authority
- JP
- Japan
- Prior art keywords
- recording
- recording layer
- light
- wavelength
- substrate
- 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
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
-
- 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
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2531—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising glass
-
- 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
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
-
- 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
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【発明の詳細な説明】
本発明は記録層に与えた物理的変形による情報
を光学的に読み出すいわゆる光記録媒体に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called optical recording medium in which information is optically read out by physically deforming a recording layer.
情報の記録媒体として従来から用いられている
ものは磁気記録媒体であるが、これは情報記録密
度に限界があること、ノイズ特性の改善にも限界
があること、媒体とヘツドとが接触した状態で用
いられるので媒体が摩耗することなどの欠点があ
り、従つて磁気記録媒体に代るものとして、光記
録媒体が最近注目されている。 Magnetic recording media have traditionally been used as information storage media, but they have limitations in information recording density, limitations in improving noise characteristics, and problems with the state in which the media and head are in contact. However, optical recording media have recently attracted attention as an alternative to magnetic recording media.
光記録媒体のうち、光を熱として利用するいわ
ゆるヒートモード記録では、媒体に選択的にレー
ザ光のごときコヒーレント光を照射して媒体を融
解又は燃焼させて媒体に小孔をもうけ、該小孔の
有無により情報を記録するものである。従来のヒ
ートモード記録に用いられる記録層の材料として
は、テルル、テルル−セレン−ヒ素の化合物、及
びニトロセルロースと光吸収剤との混合物などが
知られている。上述の各材料の場合には記録が永
久的であつて記録の消去及び再書き込みが不可能
であるが、記録の消去及び再書き込みが可能な媒
体として、特願昭56−51160に、記録層の熱的変
形により記録するスチレンを主成分とする低重合
化合物（例えばスチレンオリゴマー）、ナイロン、
ABS樹脂などの有機高分子物質が提案されてい
る。 Among optical recording media, in so-called heat mode recording that uses light as heat, the medium is selectively irradiated with coherent light such as a laser beam to melt or burn the medium to create small holes in the medium. Information is recorded depending on the presence or absence of the information. Known materials for the recording layer used in conventional heat mode recording include tellurium, tellurium-selenium-arsenic compounds, and mixtures of nitrocellulose and light absorbers. In the case of each of the above-mentioned materials, the records are permanent and cannot be erased or rewritten. However, as a medium from which records can be erased and rewritten, a recording layer Low polymerization compounds mainly composed of styrene (e.g. styrene oligomers), nylon,
Organic polymer materials such as ABS resin have been proposed.
第１図は従来の光記録媒体の構造例で、１０は
基板、１２はその上にもうけられるアルミニウム
薄膜による反射層、１４は記録層を示す。情報の
記録に当つてはレーザビームを記録層１４に選択
的に照射して記録層を部分的に除去又は変形させ
たピツトを構成し、再生時には弱いレーザビーム
で層１４を照射して、ピツトの存在する部分と存
在しない部分での反射光量の相違によりピツトの
有無を検出する。反射層１２は反射光量及びＳ／
Ｎを増大させる働きをする。 FIG. 1 shows an example of the structure of a conventional optical recording medium, in which 10 is a substrate, 12 is a reflective layer made of an aluminum thin film formed thereon, and 14 is a recording layer. When recording information, the recording layer 14 is selectively irradiated with a laser beam to partially remove or deform the recording layer to form pits, and during reproduction, the layer 14 is irradiated with a weak laser beam to form pits. The presence or absence of a pit is detected based on the difference in the amount of reflected light between the area where the pit exists and the area where it does not exist. The reflective layer 12 controls the amount of reflected light and S/
It works to increase N.
なお第１図において、２０は記録又は再生用レ
ーザビーム、２２はビームスプリツタ、２４はフ
オトセンサ、２６は再出出力端子、２８は1/4波
長板、３０は対物レンズであり、記録時には強い
レーザビームを照射して記録層１４を部分的に消
去又は変形させてピツトを構成する。再生時には
弱いレーザビームを記録層１４に照射しその反射
光をビームスプリツタ２２を介してフオトセンサ
２４により検出することによりピツトの有無を検
知することが出来る。 In Fig. 1, 20 is a recording or reproducing laser beam, 22 is a beam splitter, 24 is a photo sensor, 26 is a re-output terminal, 28 is a 1/4 wavelength plate, and 30 is an objective lens. The recording layer 14 is partially erased or deformed by irradiation with a laser beam to form pits. During reproduction, the presence or absence of pits can be detected by irradiating the recording layer 14 with a weak laser beam and detecting the reflected light by the photo sensor 24 via the beam splitter 22.
ところで、従来の光記録媒体では、記録時にレ
ーザビームの光エネルギーを記録層が十分に吸収
して効率のよい記録を行なうために、記録層に光
吸収剤として染料又は顔料を混入している。例え
ば、ニトロセルロースを記録層としオレオゾール
ELブルーを光吸収剤とし、He−Neレーザを用
いるときの記録時の光吸収効率は90％にも達し極
めて効率がよい。 By the way, in conventional optical recording media, dyes or pigments are mixed into the recording layer as a light absorbing agent in order to ensure that the recording layer sufficiently absorbs the optical energy of the laser beam during recording to perform efficient recording. For example, nitrocellulose is used as a recording layer and oleosol is used as a recording layer.
When EL Blue is used as a light absorber and a He-Ne laser is used, the light absorption efficiency during recording reaches 90%, which is extremely efficient.
しかしながら、従来の光記録媒体では、光吸収
率を高めたことの反作用として、再生時に反射光
量が不足し再生信号のＳ／Ｎが劣化するという欠
点を有する。上述のニトロセルロースにオレオゾ
ールELブルーを混入した光記録媒体では反射率
は２〜３％にすぎない。再生時のレーザビームの
強さは記録レーザビームの強さの1/10程度である
ので再生時の光量は極度に不足する。 However, conventional optical recording media have the drawback that, as a reaction to the increased light absorption rate, the amount of reflected light is insufficient during reproduction, resulting in a deterioration of the S/N of the reproduced signal. In the optical recording medium in which oleosole EL blue is mixed into the above-mentioned nitrocellulose, the reflectance is only 2 to 3%. Since the intensity of the laser beam during reproduction is about 1/10 of the intensity of the recording laser beam, the amount of light during reproduction is extremely insufficient.
上述の問題を解決する従来の技術として記録時
と再生時に異なる波長を用いる技術（例えば記録
時にはArレーザ、再生時にはHe−Neレーザ）
が知られているが、これでは装置が複雑高価とな
る。 A conventional technique to solve the above problem is a technique that uses different wavelengths during recording and reproduction (for example, Ar laser during recording and He-Ne laser during reproduction).
is known, but this makes the device complicated and expensive.
上記問題を解決する従来の別の技術として、反
射層１２を半反射層とし、記録ピツトが形成され
るときに半反射層自身もピツト部で除去されるご
とく構成する技術が知られているが、この技術は
半反射層をもうけるための製造工程が複雑である
という欠点を有する。 As another conventional technique for solving the above problem, a technique is known in which the reflective layer 12 is a semi-reflective layer and the semi-reflective layer itself is removed at the pit portion when recording pits are formed. However, this technique has the disadvantage that the manufacturing process for producing the semi-reflective layer is complicated.
従来の別の技術として、記録層の材料に光吸収
量と光反射量のバランスのとれた材料を用いる技
術が知られている。例えばTeの場合には吸収量
が60％で反射量が40％程度で好都合である。しか
し、この種の材料はTe，As，Seなどの人体に有
毒な材料に限定され、かつ吸収率と反射率の関係
を自由に設計することが出来ないという欠点を有
する。 Another known technique is to use a material for the recording layer that has a well-balanced amount of light absorption and light reflection. For example, in the case of Te, the absorption amount is 60% and the reflection amount is about 40%, which is convenient. However, this type of material is limited to materials that are toxic to the human body, such as Te, As, and Se, and has the disadvantage that the relationship between absorption and reflectance cannot be freely designed.
なお、第１図の反射層１２をもうける技術も反
射光量の増加を意図したものであるが、反射層を
形成するための製造工程が増加して歩留りを下げ
るという欠点を有する。 Note that the technique of forming the reflective layer 12 shown in FIG. 1 is also intended to increase the amount of reflected light, but has the disadvantage that the manufacturing process for forming the reflective layer is increased and the yield is lowered.
従つて本発明は従来の技術の上記各欠点を改善
するもので、その目的は、簡単な構造で光吸収率
と光反射率のバランスがとれた光記録媒体を提供
することにある。 Therefore, the present invention aims to improve the above-mentioned drawbacks of the prior art, and its object is to provide an optical recording medium with a simple structure and a well-balanced optical absorption rate and optical reflectance rate.
本発明は、基板と、該基板の少なくとも一面に
記録層を有し、レーザ光による記録層の選択的除
去又は変形により情報を記録する光記録媒体にお
いて、前記基板の一方の面の上に記録光の波長を
吸収する染料又は顔料を含む記録層を直接付着形
成し、該記録層上に再生光の波長を反射する染料
および顔料を含む反射層を直接付着形成して積層
構造とし、前記基板に基板側から入射するレーザ
光により前記記録層にピツトを形成し、該ピツト
をレーザ光により読取ることに特徴がある。 The present invention provides an optical recording medium that has a substrate and a recording layer on at least one surface of the substrate, and records information by selectively removing or deforming the recording layer using a laser beam, wherein information is recorded on one surface of the substrate. A recording layer containing a dye or pigment that absorbs the wavelength of light is directly deposited, and a reflective layer containing a dye or pigment that reflects the wavelength of reproduction light is directly deposited on the recording layer to form a laminated structure, and the substrate The method is characterized in that pits are formed in the recording layer by a laser beam incident from the substrate side, and the pits are read by the laser beam.
また、本発明は、基板と、該基板の少なくとも
一面に記録層を有し、レーザ光による記録層の選
択的除去又は変形により情報を記録する光記録媒
体において、前記記録層が、記録光の波長を吸収
する染料又は顔料と、再生光の波長を反射する染
料又は顔料とを含み、前記記録層が基板に直接付
着されることに特徴がある。 The present invention also provides an optical recording medium that has a substrate and a recording layer on at least one surface of the substrate, and records information by selectively removing or deforming the recording layer using a laser beam, wherein the recording layer is The recording layer is characterized in that it contains a dye or pigment that absorbs the wavelength and a dye or pigment that reflects the wavelength of the reproduction light, and that the recording layer is directly attached to the substrate.
第２図は本発明による光記録媒体の構造例で、
４０は合成樹脂又はガラスによる基板、４２は厚
さ約1μの記録層である。記録層４２は、例えば
ニトロセルロースを主成分とし、これに光吸収剤
としての色素（例えばオレオゾールELブルー）
と、光反射剤としての色素を混入したものであ
る。光反射剤としては、例えば、ベンジンイエロ
ー、ブリリアントカーミン6Bなどの顔料が可能
である。吸収剤と反射剤の混入の比率を制御する
ことにより、光記録媒体全体としての光吸収率及
び光反射率を任意に設計することが出来る。実施
例では光吸収率が80％、光反射率が20％程度とす
ることが最適であり、実用的には光吸収率が60％
以上、光反射率が10％以上とすることが好まし
い。なお上記実施例では光吸収率が従来の技術に
比べて若干低下するが、ニトロセルロースによる
記録層は極めて高感度（1nJ以下）であるので光
吸収量が若干低下しても記録感度には十分な余裕
があり、反射量の増加分だけ再生感度及びＳ／Ｎ
が向上する。 FIG. 2 shows an example of the structure of an optical recording medium according to the present invention.
40 is a substrate made of synthetic resin or glass, and 42 is a recording layer with a thickness of about 1 μm. The recording layer 42 has, for example, nitrocellulose as its main component, and a dye as a light absorber (for example, oleosole EL blue).
It also contains a dye as a light reflecting agent. Possible light reflectors include pigments such as Benzine Yellow and Brilliant Carmine 6B. By controlling the mixing ratio of absorber and reflector, it is possible to arbitrarily design the light absorption rate and light reflectance of the optical recording medium as a whole. In the example, it is optimal that the light absorption rate is about 80% and the light reflection rate is about 20%, and in practical terms, the light absorption rate is 60%.
As mentioned above, it is preferable that the light reflectance is 10% or more. Note that in the above example, the light absorption rate is slightly lower than that of the conventional technology, but the recording layer made of nitrocellulose has extremely high sensitivity (1 nJ or less), so even if the light absorption amount decreases slightly, it is still sufficient for recording sensitivity. playback sensitivity and S/N by the increase in reflection amount.
will improve.
以上のごとく、本発明では染料又は顔料の反射
分光特性が波長依存性をもつことを利用して、２
種以上の色素の混合により任意の吸収率及び反射
率を得ることが出来る。又反射率の向上のために
従来用いられた金属による反射層又は半反射層は
不要である。 As described above, the present invention takes advantage of the fact that the reflection spectral characteristics of dyes or pigments are wavelength dependent.
Any desired absorbance and reflectance can be obtained by mixing more than one type of dye. Further, a reflective layer or a semi-reflective layer made of metal, which is conventionally used to improve reflectance, is not necessary.
第３図は本発明の別の実施例で、光吸収層と光
反射層を別にもうける構成を示す。４０は合成樹
脂又はガラスによる基板でテープの場合には10〜
20μ、デイスクの場合には1.5mm程度の厚さとす
る。４４は第１記録層で1μ程度の厚さを有し、
光吸収剤を含むニトロセルロースで構成される。
４６は第２記録層で1000〜3000Åの厚さを有し、
光反射剤を含むニトロセルロースで構成される。
第３図の構成では光吸収層と光反射層が別々にも
うけられるので、吸収率と反射率の制御がより容
易である。 FIG. 3 shows another embodiment of the present invention, in which a light absorption layer and a light reflection layer are provided separately. 40 is a substrate made of synthetic resin or glass, and in the case of tape, it is 10~
The thickness should be 20μ, and in the case of a disk, the thickness should be about 1.5mm. 44 is a first recording layer having a thickness of about 1μ,
Composed of nitrocellulose containing light absorbers.
46 is a second recording layer having a thickness of 1000 to 3000 Å,
Composed of nitrocellulose containing light reflecting agents.
In the configuration shown in FIG. 3, since the light absorption layer and the light reflection layer are provided separately, it is easier to control the absorption rate and the reflection rate.
以上詳説したごとく、本発明によると記録層に
光吸収剤と光反射剤の両方が含まれるので、所望
の吸収率と反射率を容易に得ることが出来、所望
の記録感度、再生感度及びＳ／Ｎを容易に得るこ
とが出来、かつ、反射層がないので製造工程が簡
単となる。 As explained in detail above, according to the present invention, since the recording layer contains both a light absorbing agent and a light reflecting agent, it is possible to easily obtain the desired absorption rate and reflectance, and the desired recording sensitivity, reproduction sensitivity, and S. /N can be easily obtained, and since there is no reflective layer, the manufacturing process is simple.
第１図は従来の光記録媒体の構造例、第２図は
本発明による光記録媒体の構造例、第３図は本発
明による光記録媒体の別の構造例である。
４０……基板、４２，４４，４６……記録層。
FIG. 1 shows a structural example of a conventional optical recording medium, FIG. 2 shows a structural example of an optical recording medium according to the present invention, and FIG. 3 shows another structural example of an optical recording medium according to the present invention. 40... Substrate, 42, 44, 46... Recording layer.
Claims (1)
有し、レーザ光による記録層の選択的除去又は変
形により情報を記録する光記録媒体において、 前記基板の一方の面の上に記録光の波長を吸収
する第１の染料又は顔料を混入した樹脂結合剤を
含む第１記録層を直接付着形成し、該第１記録層
上に再生光の波長を反射する第２の染料又は顔料
を混入した樹脂結合剤を含む第２記録層を直接付
着形成して積層構造とし、前記基板に基板側から
入射する記録用レーザ光により前記各記録層にピ
ツトを形成し、該ピツトを前記記録用レーザ光と
ほぼ同じ波長の再生用レーザ光により読取ること
を特徴とする光記録媒体。 ２ 前記第２記録層における再生光の波長の反射
率が10％以上であることを特徴とする特許請求の
範囲第１項記載の光記録媒体。 ３ 前記第１記録層における記録光の波長の吸収
率が65％以上であることを特徴とする特許請求の
範囲第１項記載の光記録媒体。 ４ 前記第１記録層はニトロセルロースを主成分
とし、前記第２記録層はニトロセルロースを主成
分とすることを特徴とする特許請求の範囲第１
項、第２項、又は第３項記載の光記録媒体。 ５ 基板と、該基板の少なくとも一面に記録層を
有し、レーザ光による記録層の選択的除去又は変
形により情報を記録する光記録媒体において、前
記記録層が記録光の波長を吸収する第１の染料又
は顔料と、前記記録光とほぼ同じ波長の再生光の
波長を反射する第２の染料又は顔料とを混入した
樹脂結合剤を含み、前記記録層が基板に直接付着
されることを特徴とする光記録媒体。 ６ 前記記録層が単一の層で第１及び第２の２種
の染料又は顔料を均一に含むことを特徴とする特
許請求の範囲第５項記載の光記録媒体。 ７ 前記記録層における再生光の波長の反射率が
10％以上であることを特徴とする特許請求の範囲
第５項記載の光記録媒体。 ８ 前記記録層における記録光の波長の吸収率が
60％以上であることを特徴とする特許請求の範囲
第５項記載の光記録媒体。[Scope of Claims] 1. An optical recording medium that has a substrate and a recording layer on at least one surface of the substrate, and records information by selectively removing or deforming the recording layer using a laser beam, comprising: A first recording layer containing a resin binder mixed with a first dye or pigment that absorbs the wavelength of the recording light is directly deposited thereon, and a second recording layer that reflects the wavelength of the reproduction light is formed on the first recording layer. A second recording layer containing a resin binder mixed with dye or pigment is directly deposited to form a laminated structure, and pits are formed in each of the recording layers by a recording laser beam incident on the substrate from the substrate side, and the pits are formed in the recording layer. An optical recording medium characterized in that the information is read by a reproducing laser beam having approximately the same wavelength as the recording laser beam. 2. The optical recording medium according to claim 1, wherein the reflectance of the wavelength of reproduction light in the second recording layer is 10% or more. 3. The optical recording medium according to claim 1, wherein the absorption rate of the wavelength of recording light in the first recording layer is 65% or more. 4. Claim 1, wherein the first recording layer contains nitrocellulose as a main component, and the second recording layer contains nitrocellulose as a main component.
The optical recording medium according to item 2, item 2, or item 3. 5. An optical recording medium that has a substrate and a recording layer on at least one surface of the substrate, and records information by selectively removing or deforming the recording layer with a laser beam, wherein the recording layer absorbs the wavelength of the recording light. and a second dye or pigment that reflects a wavelength of reproduction light having approximately the same wavelength as the recording light, and the recording layer is directly attached to the substrate. optical recording medium. 6. The optical recording medium according to claim 5, wherein the recording layer is a single layer and uniformly contains two types of dyes or pigments, first and second. 7 The reflectance of the wavelength of the reproduction light in the recording layer is
The optical recording medium according to claim 5, characterized in that it is 10% or more. 8 The absorption rate of the wavelength of recording light in the recording layer is
The optical recording medium according to claim 5, characterized in that it is 60% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56108894A JPS5811196A (en) | 1981-07-14 | 1981-07-14 | Beam recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56108894A JPS5811196A (en) | 1981-07-14 | 1981-07-14 | Beam recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5811196A JPS5811196A (en) | 1983-01-21 |
| JPH0470159B2 true JPH0470159B2 (en) | 1992-11-10 |
Family
ID=14496303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56108894A Granted JPS5811196A (en) | 1981-07-14 | 1981-07-14 | Beam recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5811196A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58105442A (en) * | 1981-12-16 | 1983-06-23 | Ricoh Co Ltd | Optical recording and reproducing method |
| JPH01180515A (en) * | 1988-01-13 | 1989-07-18 | Tome Sangyo Kk | Cleaning liquid and cleaning method for contact lens |
| US5272326A (en) * | 1988-06-21 | 1993-12-21 | Kyodo Printing Co., Ltd. | Optical card having light absorbing layer |
| JP2673280B2 (en) * | 1988-06-21 | 1997-11-05 | 共同印刷株式会社 | Optical recording card |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5920473B2 (en) * | 1974-08-06 | 1984-05-14 | キヤノン株式会社 | Method for manufacturing laser beam recording medium |
| GB1547971A (en) * | 1975-10-10 | 1979-07-04 | Spence Bate | Record copying support |
| NL7809159A (en) * | 1977-09-29 | 1979-04-02 | Philips Nv | INFORMATION REGISTRATION ELEMENT WITH DYE CONTAINING AUXILIARY LAYER. |
| JPS5494331A (en) * | 1978-01-09 | 1979-07-26 | Nippon Denso Co Ltd | Preparation of light and dark pattern |
| JPS5586787A (en) * | 1978-12-22 | 1980-06-30 | Nec Corp | Laser recording film |
| CA1127945A (en) * | 1979-06-04 | 1982-07-20 | James H. Sharp | Optical disc |
-
1981
- 1981-07-14 JP JP56108894A patent/JPS5811196A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5811196A (en) | 1983-01-21 |
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