JPS6313789A - Optical recording medium - Google Patents
Optical recording mediumInfo
- Publication number
- JPS6313789A JPS6313789A JP61157306A JP15730686A JPS6313789A JP S6313789 A JPS6313789 A JP S6313789A JP 61157306 A JP61157306 A JP 61157306A JP 15730686 A JP15730686 A JP 15730686A JP S6313789 A JPS6313789 A JP S6313789A
- Authority
- JP
- Japan
- Prior art keywords
- cyanine dye
- optical recording
- methylstyrene
- poly
- recording medium
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 39
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 claims abstract description 30
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract description 5
- 239000002904 solvent Substances 0.000 abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 125000001434 methanylylidene group Chemical group [H]C#[*] 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000004528 spin coating Methods 0.000 abstract description 3
- 238000003860 storage Methods 0.000 abstract description 3
- 230000001678 irradiating effect Effects 0.000 abstract 1
- 230000008929 regeneration Effects 0.000 abstract 1
- 238000011069 regeneration method Methods 0.000 abstract 1
- 239000000975 dye Substances 0.000 description 34
- 238000000034 method Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- 239000010408 film Substances 0.000 description 6
- 239000010409 thin film Substances 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- LWUVWAREOOAHDW-UHFFFAOYSA-N lead silver Chemical compound [Ag].[Pb] LWUVWAREOOAHDW-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000010979 ruby Substances 0.000 description 1
- 229910001750 ruby Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 239000008096 xylene 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
- 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
- G11B7/247—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 methine or polymethine dyes
- G11B7/2472—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 methine or polymethine dyes cyanine
-
- 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
- G11B7/245—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 a polymeric component
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、光ディスクに代表される光記録媒体に関する
ものであり、特にいわゆる有機色素系追記型光記録媒体
の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical recording medium typified by an optical disk, and particularly to improvements in so-called organic dye-based write-once optical recording media.
本発明は、基板上に記録層を形成してなる光記録媒体に
おいて、
上記記録層をシアニン系色素とポリ−α−メチルスチレ
ンとで構成することにより、
光記録媒体の耐光性の向上を図ろうとするものである。The present invention aims to improve the light resistance of an optical recording medium in which a recording layer is formed on a substrate, by composing the recording layer with a cyanine dye and poly-α-methylstyrene. It is something that we try to do.
光記録方式は、非接触で記録・再生ができ取扱いが容易
であること、傷や塵埃等に強いこと、等の特徴を存し、
特に磁気記録方式に比べて記憶容量が数十倍から数百倍
大きいという利点を有することから、コード情報やイメ
ージ情報等の大容量ファイルへの活用が期待されている
。Optical recording methods have the characteristics of being able to record and play back without contact, being easy to handle, and being resistant to scratches and dust.
In particular, since it has the advantage of having a storage capacity several tens to hundreds of times larger than magnetic recording methods, it is expected to be used for large-capacity files such as code information and image information.
なかでら、ユーザが書込み後直接読取りできる、いわゆ
る追記型光記録媒体に対する閏心は高く、高感度、高安
定性（化学的・機械的）、高品質等の要望に答えるため
、特に記録材料に関する研究が盛んに行われている。Among them, so-called write-once optical recording media, which users can directly read after writing, are of high interest, and in order to meet the demands for high sensitivity, high stability (chemical and mechanical), and high quality, recording materials are being developed. There is a lot of research going on.
ところで、この種の光記録媒体に用いられる記録材料に
は適度な光吸収係数と反射率が要求され、従来、Ｔｅや
Ｔｉ等の合圧または全屈合金薄膜、Ｔｅ０Ｘ薄膜等の金
属化合物薄膜、銀鉛薄膜、等が採用されていた。しかし
ながら、これら金属薄膜はスパッタリング法や真空茎着
法等の真空３ ＩＩ！１１形成技術で形成されるため、
量産性等の点で問題があり、得られる光記録媒体が高価
なものとなってしまうという欠点があった。By the way, recording materials used in this type of optical recording medium are required to have appropriate light absorption coefficients and reflectances, and conventionally, thin films of combined pressure or total bending alloys such as Te and Ti, metal compound thin films such as Te0X thin films, Silver-lead thin films, etc. were used. However, these metal thin films can be produced using vacuum methods such as sputtering and vacuum deposition methods. Because it is formed using 11 forming technology,
There are problems in terms of mass production, etc., and the resulting optical recording medium is expensive.
かかる状況より、記録材料として有機色素材料を用い、
塗布手段にて記録層を形成した光記録媒体が提案されて
いる。このように有機色素材料を記録材料とした光記録
媒体は、記！３層をスピンコード等の手段で塗布できる
ので、量産性や製品価格の点で実用性が高いといえる。Under these circumstances, organic dye materials are used as recording materials,
Optical recording media have been proposed in which a recording layer is formed by coating means. In this way, optical recording media using organic dye materials as recording materials are described below! Since three layers can be applied by means such as a spin cord, it can be said to be highly practical in terms of mass production and product price.
この有機色素系の光記録媒体には、基板と記録層の間に
反射膜を設は当該反射膜での反射率の差を信号として読
み取るタイプのものと、有機色素を含む記録層の反射率
を透明基板を介して直接読み取るタイプのものとがある
が、前者は反射膜を茎着等の手法で形成する必要があり
プロセス的メリ、トが薄れること、下地の反射膜の熱伝
導率が高いためエネルギーロスが大きく照射するレーザ
の出力を必要以上に大きくする必要があること等の欠点
を有している。These organic dye-based optical recording media include two types: one in which a reflective film is provided between the substrate and the recording layer and the difference in reflectance on the reflective film is read as a signal, and the other type in which the difference in reflectance on the reflective film is read as a signal. There is a type that reads directly through a transparent substrate, but in the former, the reflective film needs to be formed by a method such as bonding. Since it is expensive, it has drawbacks such as a large energy loss and the need to increase the output of the laser for irradiation more than necessary.
そこで、色素合成技術の進歩により反射率の高い色素が
出現してからは、上記有機色素を含む記録層の反射率を
透明基板を介して直接読み取る光記録媒体が積掻的に採
用されている。Therefore, since dyes with high reflectance appeared due to advances in dye synthesis technology, optical recording media that directly read the reflectance of a recording layer containing the above-mentioned organic dyes through a transparent substrate have been widely adopted. .
ところで、前記光記録媒体は、有機色素がレーザ光を吸
収することにより照射部の記録層の温度が急激に上昇す
ることを利用したもので、ポリマーを溶融するとともに
色素を溶融・昇華・分解し記録ピントを形成するもので
ある。したがって、使用する有機色素材料には、レーザ
光の波長領域で当該レーザ光を効果的に吸収すること、
同時にこの波長領域でレーザ光を良く反射すること、適
当な溶媒に可溶であること、等の特性が要求される。By the way, the above-mentioned optical recording medium utilizes the fact that the temperature of the recording layer in the irradiated area increases rapidly when the organic dye absorbs laser light. It forms the recording focus. Therefore, the organic dye material used must be able to effectively absorb the laser light in the wavelength range of the laser light,
At the same time, it is required to have properties such as good reflection of laser light in this wavelength range and solubility in an appropriate solvent.
シアニン系色素は、例えば半導体レーザの波長領域であ
る近赤外域に大きな吸収を持ち、また同時に近赤外域で
の反射率も大きいことから、追記型光記録媒体の記録材
料として有望視されている。Cyanine dyes have large absorption in the near-infrared region, which is the wavelength range of semiconductor lasers, for example, and also have high reflectance in the near-infrared region, so they are considered promising as recording materials for write-once optical recording media. .
しかしながら、−ｍにシアニン系色素は耐光性に乏しく
、情叩の長期保存を前提とした場合、光記録媒体として
の信転性に不安が残る。However, -m cyanine dyes have poor light resistance, and when long-term preservation of impressions is assumed, reliability as an optical recording medium remains uneasy.
そこで、本発明は上記問題点を解決するために提案され
たものであり、長期間保存しても耐光性の劣化がなく信
転性に優れ、かつ量産性に優れた光記録媒体を提供する
ことを目的とする。Therefore, the present invention was proposed to solve the above problems, and provides an optical recording medium that does not deteriorate in light resistance even after long-term storage, has excellent reliability, and is excellent in mass production. The purpose is to
本発明者等は、上述の目的を達成するために、鋭意研究
を重ねた結果、シアニン系色素とポリ−α−メチルスチ
レンとを組合わせた記録層は、所定のレーザ光の波長領
域での反射率及び光吸収係数が大きいことはもとより、
長期に亘り耐光性が劣化することがなくかつ機械的強度
も大きいとの知見を得るに至った。In order to achieve the above object, the present inventors have conducted intensive research and found that a recording layer that combines cyanine dye and poly-α-methylstyrene can be used in a predetermined wavelength range of laser light. In addition to having a high reflectance and light absorption coefficient,
It has been found that the light resistance does not deteriorate over a long period of time and the mechanical strength is also high.
本発明の光記録媒体は、上述の知見に基づいて完成され
ものであり、基板上にシアニン系色素及びポリ−α−メ
チルスチレンを含有する記録層を形成したことを特徴と
するものである。The optical recording medium of the present invention was completed based on the above-mentioned findings, and is characterized by forming a recording layer containing a cyanine dye and poly-α-methylstyrene on a substrate.
本発明において記録層に使用されるシアニン系色素は、
一般式（１）
（但し、式中ｎはメチン鎖の数を表すもので自然数を、
Ｒはアルキル基を、Ｘ−はＣ１−、Ｂｒ−，１−。The cyanine dye used in the recording layer in the present invention is
General formula (1) (However, in the formula, n represents the number of methine chains and is a natural number.
R is an alkyl group, and X- is C1-, Br-, 1-.
ＣｌＯ４−等の陰イオンを、それぞれ表す。）で表され
、メチン鎖の両端に含窒素複素環が結合された構造を有
するものである。すなわち、上記窒素複素環を表し、か
かる含窒素複素環としては、例えば、
ｉ ） ｉｉ ）
等が挙げられる。なお、これら含窒素複素環はその水素
原子の一部をアルキル基等で置換したものであっても良
い。Each represents an anion such as ClO4-. ), and has a structure in which nitrogen-containing heterocycles are bonded to both ends of a methine chain. That is, it represents the above-mentioned nitrogen heterocycle, and examples of such nitrogen-containing heterocycle include i)) ii) and the like. Note that these nitrogen-containing heterocycles may have some of their hydrogen atoms substituted with an alkyl group or the like.
かかるシアニン系色素の具体例としては、例えば、 等が挙げられる。Specific examples of such cyanine dyes include, for example: etc.
一方、本発明において記録層に用いられるポリ−α−メ
チルスチレンは、上記シアニン系色素の耐光性を向上さ
せる作用を有し、次の一般式（ＩＩ）にて表される。On the other hand, poly-α-methylstyrene used in the recording layer in the present invention has the effect of improving the light resistance of the cyanine dye, and is represented by the following general formula (II).
上記ポリ−α−メチルスチレンは、シアニン系色素との
相溶性が良くしかもフィルム形成能に優れているので、
シアニン系色素中に均一に分散される。The poly-α-methylstyrene has good compatibility with cyanine dyes and has excellent film-forming ability.
Uniformly dispersed in cyanine dyes.
ここで、上記シアニン系色素とポリ−α−メチルスチレ
ンとの組成比（シアニン系色素／ポリ−α−メチルスチ
レン＝Ａ）は、２５／ ７５ ＜ Ａ ＜ ７５／２５
の範囲が好適である。すなわち、Ａ≦２５／７５では記
録層の耐光性の劣化が顕著となり、逆にＡ≧７５／２５
では記録層の反射率が低下しＣ／Ｎ特性が劣化するので
好ましくない。Here, the composition ratio of the cyanine dye and poly-α-methylstyrene (cyanine dye/poly-α-methylstyrene = A) is 25/75 < A < 75/25.
A range of is suitable. That is, when A≦25/75, the light resistance of the recording layer deteriorates significantly, and conversely, when A≧75/25
This is not preferable because the reflectance of the recording layer decreases and the C/N characteristics deteriorate.
本発明の光記録媒体においては、第１図に示すように、
上記シアニン系色素とポリ−α−メチルスチレンとが上
記組成となるように溶媒に溶解した後、透明基板（２）
に塗布することにより記録層（１）を形成する。得られ
た光記録媒体に情報信号を記録するには、透明基板（２
）側より直径数μｍ程度に絞ったレーザ光りを記Ｕ層（
１）に照射し、この照射部のポリ−α−メチルスチレン
を溶融するとともに、シアニン系色素を溶融・分解・昇
華し記録ビットを形成する。また、再生する際にも同様
に基板（２）側より所定波長のレーザ光りを照射し、上
記ピット部とスペース部（ビットの形成されてない部分
）の反射率の差をもって情報信号を読み取る＋１１成と
なっている。In the optical recording medium of the present invention, as shown in FIG.
After the cyanine dye and poly-α-methylstyrene are dissolved in a solvent to have the above composition, a transparent substrate (2) is prepared.
A recording layer (1) is formed by coating the film. In order to record information signals on the obtained optical recording medium, a transparent substrate (2
) from the U layer (
1), the poly-α-methylstyrene in the irradiated area is melted, and the cyanine dye is melted, decomposed, and sublimated to form recording bits. Also, during reproduction, laser light of a predetermined wavelength is irradiated from the substrate (2) side in the same way, and the information signal is read based on the difference in reflectance between the pit portion and the space portion (portion where no bit is formed). It has become a reality.
照射するレーザ光りは、記録材料（すなわちシアニン系
色素）の吸収波長に応して通宜選沢すれば良く、具体的
には、半導体レーザ、 ＣＯ，ガスレーザ、 Ａｒガ
スレーザ、 ｌ１ｅ−Ｎｅガスレーザ、ルビーレーザ、
色素レーザ等が挙げられる。The laser light to be irradiated may be selected depending on the absorption wavelength of the recording material (i.e. cyanine dye), and specifically, semiconductor laser, CO, gas laser, Ar gas laser, 11e-Ne gas laser, ruby. laser,
Examples include dye lasers.
上記基板（２）としては、通常の光ディスクに用いられ
るものであれば如何なるものであっても良く、例えばガ
ラス基板、ポリカーボネート樹脂等のプラスチック基板
等の剛性を有する透明基板が好適である。The substrate (2) may be any substrate as long as it is used for ordinary optical discs, and preferably is a transparent substrate having rigidity such as a glass substrate or a plastic substrate such as polycarbonate resin.
また、シアニン系色素とポリ−α−メチルスチレンとを
塗布し記録層を形成するに際して使用される溶媒として
は、メタノール、エタノール、イソプロピルアルコール
等のアルコール類や、アセトン、メチルエチルケトン、
シクロヘキサノン等のケトン類、エチルエーテル５ ジ
オキサン５ テトラヒドロフラン等のエーテル類、酢酸
エチル、酢ｆｉｎ−ブチル等のエステル類、さらにはヘ
ンゼン、トルエン、キシレン、ｎ−ヘキサン、シクロヘ
キサン、アセトニトリル、ジメチルホルムアミド、ジメ
チルスルホキシド、クロロホルム等の各種汎用）６媒及
びこれらの混合溶媒が挙げられる。Solvents used to form a recording layer by coating cyanine dye and poly-α-methylstyrene include alcohols such as methanol, ethanol, isopropyl alcohol, acetone, methyl ethyl ketone,
Ketones such as cyclohexanone, ethyl ether 5 dioxane 5 ethers such as tetrahydrofuran, esters such as ethyl acetate and fin-butyl acetate, as well as henzene, toluene, xylene, n-hexane, cyclohexane, acetonitrile, dimethylformamide, dimethyl sulfoxide. , various general-purpose) 6 solvents such as chloroform, and mixed solvents thereof.
さらに、塗布方法としては、通常の手法が用いられ、例
えばスピンコード法、スプレーコート法、ロールコート
法、ディフビイング法等が挙げられるが、中でも得られ
る塗膜の均一性に優れること等からスピンコード法が好
適である。Furthermore, as a coating method, usual methods are used, such as spin code method, spray coating method, roll coating method, diffusing method, etc. Among them, spin coating is used because of its excellent uniformity of the coating film obtained. The code method is preferred.
本発明の光記録媒体の記録材料として用いられるシアニ
ン系色素は、レーザ光の波長９ｉ域での光吸収係数及び
反射率が高く、良好な光記録再生特性を得ることができ
る。The cyanine dye used as the recording material of the optical recording medium of the present invention has a high optical absorption coefficient and reflectance in the 9i wavelength region of laser light, and can obtain good optical recording and reproducing characteristics.
また、上記シアニン系色素にポリ−α−メチルスチレン
を所定量添加することにより、上記シアニン系色素の耐
光性が大幅に向上する。Further, by adding a predetermined amount of poly-α-methylstyrene to the cyanine dye, the light resistance of the cyanine dye is significantly improved.
Ｃ実施例〕 以下、本発明を具体的な実施例に基づいて説明する。C Example] The present invention will be described below based on specific examples.
大公■
先ず、シアニン系色素（日本感光色素株式会社製、商品
名ＮＫ−１２５）とポリ−α−メチルスチレンとがそれ
ぞれ１重量％なるようにメチルエチルケトンに？８解し
た後、この）容ン夜をガラス基（屋上にスピンコーティ
ング法にて塗布・乾燥し、記録層の膜厚が１０００人の
光記録媒体を作製した。Grand Duke■ First, add cyanine dye (manufactured by Nippon Kanko Shokuryo Co., Ltd., trade name NK-125) and poly-α-methylstyrene to methyl ethyl ketone so that they each have a concentration of 1% by weight. After the coating was dissolved, this coating was coated on a glass substrate (by spin coating method) and dried to produce an optical recording medium with a recording layer having a thickness of 1000 mm.
この実施例で使用したシアニン系色素の構造は下式（［
１）で示される。The structure of the cyanine dye used in this example is the following formula ([
1).
比較のために、先の実施例において、ポリ−α−メチル
スチレンの代わりにニトロセルロースを用い、他は先の
実施例と同様にして光記録媒体を作製した。For comparison, an optical recording medium was produced in the same manner as in the previous example except that nitrocellulose was used instead of poly-α-methylstyrene.
次に、上記実施例及び比較例で得られた光記録媒体に対
して、タングステンランプを用いて１００００ルクスの
光を照射し、この時の記録層の吸光度の劣化状態を調べ
た。結果を第２図に示す。Next, the optical recording media obtained in the above examples and comparative examples were irradiated with light of 10,000 lux using a tungsten lamp, and the state of deterioration of the absorbance of the recording layer at this time was examined. The results are shown in Figure 2.
この第２図より明らかなように、比較例の劣化速度を１
としたときに、実施例の劣化速度は０．０９〜０．１０
となることがわかった。すなわち、記！３層としてシア
ニン系色素にポリ−α−メチルスチレンを添加した光記
録媒体は、ニトロセルロースを添加したものに比べて、
光記録媒体の寿命を１０倍以上に伸ばすことができる。As is clear from this figure 2, the deterioration rate of the comparative example was reduced to 1
When, the deterioration rate of the example is 0.09 to 0.10
It was found that In other words, record! An optical recording medium in which poly-α-methylstyrene is added to a cyanine dye as a three-layer layer has the following characteristics:
The lifespan of optical recording media can be extended by more than 10 times.
したがって、シアニン系色素とポリ−α−メチルスチレ
ンにより記録層を構成してなる光記録媒体は、情報信号
の信頼性を長期間維持できると言える。Therefore, it can be said that an optical recording medium whose recording layer is composed of a cyanine dye and poly-α-methylstyrene can maintain reliability of information signals for a long period of time.
さらに、上記実施例で得られた光記録媒体に対して、書
込みレーザ光出力８ＩＩＩＷ、ｖＡ速度２ＩＩｌ／ｓｅ
ｃ、変調周波数ＩＭ／ｌｌｚで所定の信号を書き込み、
読出しレーザ光出力０．２ｍＷで再生し、再生（３号の
Ｃ／間を調べたところ、５０ｄＢ以上（最大で５５ｄＢ
）であった、この結果、本発明の光記録媒体においては
、ノイズが少なく実用性の高い記録再生特性を示ことが
わかった。Furthermore, for the optical recording medium obtained in the above example, the writing laser light output was 8IIIW, and the vA speed was 2IIl/se.
c. Write a predetermined signal at a modulation frequency IM/llz,
Reproduction is performed with a readout laser light output of 0.2 mW (I checked the C/ of No. 3 and found that it was 50 dB or more (maximum 55 dB).
).As a result, it was found that the optical recording medium of the present invention exhibited recording and reproducing characteristics with little noise and high practicality.
以上の説明からも明らかなように、本発明の光記録媒体
においては、記録層にシアニン系色素とポリ−α−メチ
ルスチレンとの分散系を用いているので、耐光性が格段
に向上すると同時に、Ｃ／間も大幅に向上する。As is clear from the above description, in the optical recording medium of the present invention, since a dispersion system of cyanine dye and poly-α-methylstyrene is used in the recording layer, light resistance is significantly improved and at the same time , C/ is also significantly improved.
したがって、情報信号の信頼性が長期に亘って保持でき
るので、極めて実用性の高い光記録媒体が提供できる。Therefore, since the reliability of the information signal can be maintained for a long period of time, an extremely practical optical recording medium can be provided.
また、本発明の光記録媒体は、従来広く■いられている
塗布技術により記録層を形成しているので、量産性や生
産性の点で有利であり、しかも製造コストの軽減が図れ
るという利点も有している。In addition, the optical recording medium of the present invention has a recording layer formed by a coating technique that has been widely used in the past, so it is advantageous in terms of mass production and productivity, and furthermore, it has the advantage of reducing manufacturing costs. It also has
第１図は光記録媒体の構成を示す要部断面図である。
第２図は記録層の劣化速度を吸光度の経時変化として示
す特性図である。
１・・・・記録層
２・・・・基板FIG. 1 is a sectional view of a main part showing the structure of an optical recording medium. FIG. 2 is a characteristic diagram showing the deterioration rate of the recording layer as a change in absorbance over time. 1...Recording layer 2...Substrate
Claims (1)
を含有する記録層を形成したことを特徴とする光記録媒
体。An optical recording medium characterized in that a recording layer containing a cyanine dye and poly-α-methylstyrene is formed on a substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61157306A JPS6313789A (en) | 1986-07-04 | 1986-07-04 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61157306A JPS6313789A (en) | 1986-07-04 | 1986-07-04 | Optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6313789A true JPS6313789A (en) | 1988-01-21 |
Family
ID=15646783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61157306A Pending JPS6313789A (en) | 1986-07-04 | 1986-07-04 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6313789A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01238986A (en) * | 1988-03-18 | 1989-09-25 | Dainippon Printing Co Ltd | Receiving sheet for thermal transfer |
-
1986
- 1986-07-04 JP JP61157306A patent/JPS6313789A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01238986A (en) * | 1988-03-18 | 1989-09-25 | Dainippon Printing Co Ltd | Receiving sheet for thermal transfer |
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