JPH06150379A - Optical recording medium - Google Patents

Optical recording medium

Info

Publication number
JPH06150379A
JPH06150379A JP4294321A JP29432192A JPH06150379A JP H06150379 A JPH06150379 A JP H06150379A JP 4294321 A JP4294321 A JP 4294321A JP 29432192 A JP29432192 A JP 29432192A JP H06150379 A JPH06150379 A JP H06150379A
Authority
JP
Japan
Prior art keywords
film
protective film
recording
layer
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
Application number
JP4294321A
Other languages
Japanese (ja)
Inventor
Takashi Yamada
高士 山田
Takashi Chuma
隆 中馬
Makoto Okano
誠 岡野
Toshiyuki Miyadera
敏之 宮寺
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP4294321A priority Critical patent/JPH06150379A/en
Publication of JPH06150379A publication Critical patent/JPH06150379A/en
Pending legal-status Critical Current

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

Abstract

PURPOSE:To prevent the deterioration of recording characteristic after recording and to improve weather resistance by forming two or more layers laminar structure as a protective film and the hardness of the most inner layer of the protective film layer of the light reflecting film is made less than that of other protective film layers. CONSTITUTION:This optical recording medium 1 consists of a recording film 12 on a light-transmitting substrate 11, and light reflecting film 13 formed on the recording film 12. Further, the protective film 30 consisting of two protective layers 31, 32 is formed on the reflecting film 13. The hardness of the most inner protective layer 31 to the light reflecting film is set to be lower than that of the other protective layer 32. More particularly, the most inner protective layer 31 consists of elastomer. In such a case, the elasticity of the elastomer relaxes stress to improve the weather resistance of the medium.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、書込みあるいは読み出
し可能な光記録媒体、特に耐候性に優れ、記録後の記録
特性の劣化が生じないような光記録媒体に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writable or readable optical recording medium, and more particularly to an optical recording medium excellent in weather resistance and free from deterioration of recording characteristics after recording.

【0002】[0002]

【従来の技術】従来、いわゆる書込み可能な追記型光記
録媒体の記録膜には例えば、シアニン系、フタロシアニ
ン系などの有機色素が用いられていることは一般に良く
知られている。
2. Description of the Related Art Conventionally, it is generally well known that a recording film of a so-called writable write-once type optical recording medium uses an organic dye such as cyanine or phthalocyanine.

【0003】そして、このような追記型光記録媒体の書
込み方法としては、記録膜の微小面積にレーザビームを
集光させ、それを熱エネルギーに変換し、記録膜の性状
を変えて(ピット形成)行っている。この記録膜の性状
変化を円滑に行うために、媒体の構成は基板上に記録膜
を設層したものを2枚用意し、記録膜を対向して配置し
たいわゆるエアーサンドイッチ構造とされることが一般
的である。
As a writing method for such a write-once type optical recording medium, a laser beam is focused on a very small area of the recording film and converted into heat energy to change the properties of the recording film (pit formation). )Is going. In order to smoothly change the properties of the recording film, the medium may have a so-called air sandwich structure in which two recording films are provided on a substrate and the recording films are arranged to face each other. It is common.

【0004】このようなタイプの追記型光記録媒体に用
いられる書込み用のレーザビームは、透明基板側から照
射され、記録膜の中に光読取り可能なピットを形成す
る。記録されたデータを再生するための読取り用のレー
ザビームは、書込み用のそれとは弱い出力であり、ピッ
トが形成された部分と、そうでない部分のコントラスト
は電気信号として読み取られる。
The writing laser beam used in the write-once type optical recording medium of this type is irradiated from the transparent substrate side to form an optically readable pit in the recording film. The reading laser beam for reproducing the recorded data has a weaker output than that for writing, and the contrast between the portion where the pit is formed and the portion where the pit is not formed is read as an electric signal.

【0005】一方、上記媒体とは異なり予めすでにデー
タが記録されているいわゆるROM(read only memor
y)タイプの媒体も存在し、音声記録と情報処理の分野
で広く実用化されている。しかし、このものには上記の
ごとく書込み可能な記録膜が存在しない。すなわち、再
生されるべくデータに相当するプリピットはすでにプラ
スチック基板の射出成形時に形成され、この上にAu、
Ag、Cu、Al等の金属からなる反射層が形成され、
さらにこの上に保護膜が形成されている。このROMタ
イプの典型的な媒体は、いわゆるCDと呼ばれるコンパ
クトディスクである。このCDの記録と読み取りの信号
の仕様は規格化されており、この規格に準じて、CDの
再生装置がコンパクトディスクプレーヤー(CDプレー
ヤー)として広く使われている。
On the other hand, unlike the above-mentioned medium, a so-called ROM (read only memor) in which data is already recorded in advance.
There is also a y) type medium, which has been widely put to practical use in the fields of voice recording and information processing. However, this does not have a writable recording film as described above. That is, the prepits corresponding to the data to be reproduced are already formed at the time of injection molding of the plastic substrate, and Au,
A reflective layer made of a metal such as Ag, Cu or Al is formed,
Further, a protective film is formed on this. A typical medium of this ROM type is a compact disc called a so-called CD. The specifications of the recording and reading signals of the CD have been standardized, and in accordance with this standard, a CD reproducing device is widely used as a compact disc player (CD player).

【0006】ところで、前記書込み可能な追記型光記録
媒体は、レーザビームを用いる点においてはCDと同様
であり、また、媒体の形態もディスク形状をなしている
点においてはCDと同様である。それゆえ、CD仕様の
規格に適合し、CDプレーヤーにそのまま使える書込み
可能な媒体の開発が活発に行われている。
The writable write-once type optical recording medium is similar to a CD in that a laser beam is used, and is similar to a CD in that the medium has a disk shape. Therefore, a writable medium that complies with the standard of the CD specification and can be used as it is for a CD player is being actively developed.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、このよ
うな有機色素を記録膜に用いた追記型光記録媒体は、記
録を施したのち、例えば、高温高湿度下等の劣悪な環境
下に媒体をそのまま放置すると記録部分の反射率の低下
や振幅の減少、ジッター、エラーの増加などの劣化現象
を生じさせていた。
However, a write-once type optical recording medium using such an organic dye in a recording film is recorded in a bad environment such as high temperature and high humidity after recording. If left as it is, deterioration phenomena such as a decrease in reflectance, a decrease in amplitude of the recorded portion, an increase in jitter, and an error occur.

【0008】このような実情に鑑み本発明は創案された
ものであって、その目的は、高温高湿度下等の劣悪な環
境下においても、記録後の記録特性の劣化が生ぜず耐候
性に優れた光記録媒体を提供することにある。
The present invention was conceived in view of the above circumstances, and its purpose is to improve weather resistance without deterioration of recording characteristics after recording even in a bad environment such as high temperature and high humidity. An object is to provide an excellent optical recording medium.

【0009】[0009]

【課題を解決するための手段】上記課題を解決するため
本発明は、光透過性の基板と、この基板の上に形成され
た有機色素を含有する記録膜と、この記録膜の上に形成
された光反射膜と、この光反射膜の上に形成された保護
膜とを備える光記録媒体であって、前記保護膜は、少な
くとも2層以上の積層体構造をなし、光反射膜側の最内
層の保護膜構成層が、他の保護膜構成層よりも硬度が低
くなるように構成した。
In order to solve the above problems, the present invention provides a light-transmissive substrate, a recording film containing an organic dye formed on the substrate, and a recording film formed on the recording film. And a protective film formed on the light reflective film, wherein the protective film has a laminated structure of at least two layers, and the protective film on the side of the light reflective film is provided. The innermost protective film-constituting layer was configured to have a lower hardness than the other protective film-constituting layers.

【0010】本発明の光記録媒体として書き込み可能な
媒体であって、かつCD規格に適合し、なおかつ保護膜
が2層の保護膜構成層から形成されている媒体を一例と
して取り挙げて説明する。この媒体の部分断面図が図1
に示される。
An optical recording medium of the present invention, which is a writable medium, conforms to the CD standard, and has a protective film formed of two protective film constituent layers will be described as an example. . A partial cross-sectional view of this medium is shown in FIG.
Shown in.

【0011】この図に示されるように、本発明の光記録
媒体1は、光透過性の基板11の上に記録膜12が設層
され、この記録膜12の上に、光反射膜13が設層され
る。さらに光反射膜13の上には、2層の保護膜構成層
31,32から形成されている保護膜30が設けられ
る。
As shown in the figure, the optical recording medium 1 of the present invention has a recording film 12 formed on a light-transmissive substrate 11, and a light reflecting film 13 formed on the recording film 12. Layered. Further, a protective film 30 formed of two protective film constituent layers 31 and 32 is provided on the light reflecting film 13.

【0012】光透過性の基板11は、ディスク形状をな
し、基板11の片側平面には、通常、トラッキング用の
プリグルーブが、同心円状にまたはスパイラル状に形成
されている。このようなプリグルーブを有する基板11
は、生産性向上の観点から、いわゆる一体的に形成され
た射出成形樹脂基板を用いることが好ましく、このもの
は、例えば、ポリカーボネート樹脂(PC)、ポリメタ
クリル酸メチル樹脂(PMMA)等の透明材料から形成
される。また、一体的に形成された射出成形樹脂基板に
限らず、いわゆる2P(photo-polymer )法で形成した
基板であってもよい。このような基板11の厚さは1.
0〜1.5mm程度とされる。
The light-transmissive substrate 11 has a disk shape, and a pregroove for tracking is usually formed in a concentric or spiral shape on one plane of the substrate 11. Substrate 11 having such a pre-groove
From the viewpoint of improving productivity, it is preferable to use a so-called integrally formed injection-molded resin substrate, which is made of, for example, a transparent material such as polycarbonate resin (PC) or polymethylmethacrylate resin (PMMA). Formed from. Further, the substrate is not limited to the integrally formed injection-molded resin substrate, and may be a substrate formed by a so-called 2P (photo-polymer) method. The thickness of such a substrate 11 is 1.
It is about 0 to 1.5 mm.

【0013】一方、基板11の上には、記録膜12が形
成される。記録膜12の中には、有機色素、例えば、フ
タロシアニン色素が含有される。フタロシアニン色素
は、下記一般式[I]で表わされる。
On the other hand, a recording film 12 is formed on the substrate 11. The recording film 12 contains an organic dye, for example, a phthalocyanine dye. The phthalocyanine dye is represented by the following general formula [I].

【0014】[0014]

【化1】 上記一般式[I]において、R1 は置換基を有してもよ
いアルキル基、水素原子、ハロゲン原子、水酸基、−O
15、−SR15、−SeR15、−TeR15を表す。
[Chemical 1] In the above general formula [I], R 1 is an alkyl group which may have a substituent, a hydrogen atom, a halogen atom, a hydroxyl group, or —O.
R 15, -SR 15, -SeR 15 , -TeR 15, Represents

【0015】R15は、置換基を有してもよいアルキル
基、置換基を有してもよいアリール基、置換基を有して
もよいシクロアルキル基、あるいはポリエーテル基を表
す。R16、R17およびR18は、互いに同一であっても異
なっていてもよく、置換基を有してもよいアルキル基、
置換基を有してもよいシクロアルキル基、置換基を有し
てもよいアリール基、置換基を有してもよいアルコキシ
基、置換基を有してもよいアリーロキシ基、ポリエーテ
ル基、水酸基、または水素原子を表す。
R 15 represents an alkyl group which may have a substituent, an aryl group which may have a substituent, a cycloalkyl group which may have a substituent, or a polyether group. R 16 , R 17 and R 18 may be the same or different from each other and may have a substituent,
A cycloalkyl group which may have a substituent, an aryl group which may have a substituent, an alkoxy group which may have a substituent, an aryloxy group which may have a substituent, a polyether group, a hydroxyl group Or represents a hydrogen atom.

【0016】R19、R20は、互いに同一であっても異な
っていてもよく、置換基を有してもよいアルキル基、置
換基を有してもよいシクロアルキル基、置換基を有して
もよいアリール基を表す。
R 19 and R 20 may be the same or different from each other, and may have an alkyl group which may have a substituent, a cycloalkyl group which may have a substituent, or a substituent. Represents an optionally substituted aryl group.

【0017】R2 は、それぞれ独立に置換基を有しても
よいアルキル基、置換基を有してもよいアルコキシ基、
置換基を有してもよい複素環残基、ハロゲン原子、ニト
ロ基、シアノ基、スルホン酸基を表す。Meは、金属を
表す。Meとしては、特に、Si,V,Fe,Al等が
好ましい。
R 2 is independently an alkyl group which may have a substituent, an alkoxy group which may have a substituent,
It represents a heterocyclic residue which may have a substituent, a halogen atom, a nitro group, a cyano group or a sulfonic acid group. Me represents a metal. As Me, Si, V, Fe, Al and the like are particularly preferable.

【0018】また、有機色素は上記フタロシアニン色素
に変えて、シアニン色素であってもよい。このような色
素を含有する記録膜12は、例えば、スピンコート法等
の常用手段により塗設される。塗設される記録膜12の
厚さは、10〜1000nm、好ましくは、100〜5
00nmである。この値が10nm未満となると記録感
度が不足し、理想的な記録ができなくなるという不都合
が生じ、この値が1000nmを越えると反射率が不足
するという不都合が生じる。
The organic dye may be a cyanine dye instead of the phthalocyanine dye. The recording film 12 containing such a dye is applied by a conventional means such as a spin coating method. The thickness of the recording film 12 applied is 10 to 1000 nm, preferably 100 to 5 nm.
00 nm. If this value is less than 10 nm, the recording sensitivity is insufficient, and ideal recording cannot be performed. If this value exceeds 1000 nm, the reflectance is insufficient.

【0019】なお、塗布に用いる溶媒としては、前記色
素が溶け、かつ基板を侵さない公知の種々のものが用い
られ、例えば、ジアセトンアルコール、エチルセロソル
ブ、メチルセロソルブ、イソホロン、メタノール、テト
ラフルオロプロパノール等が挙げられる。
As the solvent used for coating, various known solvents in which the dye is dissolved and which does not attack the substrate are used, and examples thereof include diacetone alcohol, ethyl cellosolve, methyl cellosolve, isophorone, methanol and tetrafluoropropanol. Etc.

【0020】このような記録膜12の上には、光反射膜
13が設けられる。光反射膜13はAu、Al、Ag、
Cu等の金属から構成され、このものは真空蒸着、スパ
ッタリング、イオンプレーティング等で成膜される。こ
のような光反射膜13の厚さは、0.02〜2.0μm
程度とされる。
A light reflection film 13 is provided on the recording film 12. The light reflecting film 13 is made of Au, Al, Ag,
It is made of a metal such as Cu and is formed by vacuum vapor deposition, sputtering, ion plating or the like. The thickness of the light reflection film 13 is 0.02 to 2.0 μm.
It is considered as a degree.

【0021】光反射膜13の上には、通常、記録膜12
と光反射膜13を保護し、かつ耐久性を向上させるため
の保護膜30が設層される。保護膜30は、本実施例の
場合、2層の積層体構造をなしている。光反射膜側の最
内層の保護膜構成層31は、他の保護膜構成層32より
も硬度が低く設定される。より具体的には、最内層の保
護膜構成層31はエラストマーで構成される。
The recording film 12 is usually formed on the light reflecting film 13.
A protective film 30 is provided to protect the light reflection film 13 and improve durability. In this embodiment, the protective film 30 has a two-layer laminated structure. The innermost protective film constituting layer 31 on the light reflecting film side is set to have a lower hardness than the other protective film constituting layers 32. More specifically, the innermost protective film constituting layer 31 is made of an elastomer.

【0022】エラストマーは、室温で、ゴム弾性を示す
高分子物質をいう。すなわち、室温で伸ばすと2倍以上
に伸び、外力を取り除くと瞬間的にほとんど元の形に戻
る高分子物質、加硫ゴム等が挙げられる。ガラス転移点
Tgは、20℃以下、より好ましくは、0℃以下であ
る。このようなエラストマーは、スピンコート可能なも
のであって、その後の硬化は、紫外線硬化型のものや熱
硬化型のもの等いずれであってもよく、その種類を問わ
ない。保護膜構成層31の厚さは、0.1〜100μm
程度とされる。
Elastomer refers to a polymeric substance that exhibits rubber elasticity at room temperature. That is, a polymer substance, a vulcanized rubber, etc., which are more than doubled when stretched at room temperature and which almost instantly return to their original shape when an external force is removed, can be mentioned. The glass transition point Tg is 20 ° C. or lower, and more preferably 0 ° C. or lower. Such an elastomer can be spin-coated, and the subsequent curing may be an ultraviolet curing type or a thermosetting type, and the type thereof is not limited. The thickness of the protective film constituting layer 31 is 0.1 to 100 μm.
It is considered as a degree.

【0023】このようなエラストマーで構成される最内
層の保護膜構成層31の上に積層される他の保護膜構成
層32は、一般に、紫外線硬化型樹脂が用いられる。他
の樹脂として、エポキシ樹脂、アクリル樹脂、シリコー
ン樹脂、ウレタン樹脂等が用いられる。保護膜構成層3
2もやはり、通常、スピンコートによって積層される。
厚さは0.1〜100μm程度される。
An ultraviolet curable resin is generally used for the other protective film constituting layer 32 laminated on the innermost protective film constituting layer 31 made of such an elastomer. As the other resin, epoxy resin, acrylic resin, silicone resin, urethane resin or the like is used. Protective film constituent layer 3
2 is also usually laminated by spin coating.
The thickness is about 0.1 to 100 μm.

【0024】上述してきたように保護膜30は、2層の
積層体構造をなし、光反射膜側の最内層の保護膜構成層
31が、他の保護膜構成層32よりも硬度が低く設定さ
れる。こうすることにより、本発明の記録部の耐候性
は、格段と向上する。その理由は、本発明における記録
部分は形状変化を伴なったピット形成によるものである
ため、保護膜から応力を受けている。高温、高湿環境下
にディスクを放置した場合、この応力によってピットの
崩壊がもたらされる。保護膜にエラストマーを用いるこ
とによりエラストマーの弾性によって、上記応力が緩和
され耐候性が向上するものと考えられる。
As described above, the protective film 30 has a laminated structure of two layers, and the innermost protective film constituent layer 31 on the light reflection film side is set to have a lower hardness than the other protective film constituent layers 32. To be done. By doing so, the weather resistance of the recording portion of the present invention is significantly improved. The reason for this is that the recording portion in the present invention is formed by the formation of pits accompanied by a change in shape, and therefore receives stress from the protective film. When the disc is left in a high temperature and high humidity environment, this stress causes collapse of the pits. It is considered that by using an elastomer for the protective film, the above-mentioned stress is alleviated by the elasticity of the elastomer and the weather resistance is improved.

【0025】なお、本発明では、保護膜30の構成を2
層の場合を例にとって説明してきたが、これ限らず3層
以上の積層構造であってもよい。この場合でも最内層の
保護膜構成層は最も硬度が低い構成とされる。
In the present invention, the structure of the protective film 30 is 2
Although the case of layers has been described as an example, the present invention is not limited to this, and a laminated structure of three or more layers may be used. Even in this case, the innermost protective film constituting layer has the lowest hardness.

【0026】なお、前記基板11と記録膜12との間
や、記録膜12と光反射膜13との間には各種中間層、
例えば保護膜やエンハンス膜等を設けても良い。また、
基板11のレーザビーム入射側表面に反射防止膜を設け
ることも好ましい一態様である。
Various intermediate layers are provided between the substrate 11 and the recording film 12 and between the recording film 12 and the light reflecting film 13.
For example, a protective film or an enhance film may be provided. Also,
It is also a preferable aspect to provide an antireflection film on the surface of the substrate 11 on the laser beam incident side.

【0027】本発明の媒体は、一般に回転下において、
記録光が記録膜にパルス状に照射される。このとき記録
膜の一部が融解、除去されピットが形成される。このよ
うに形成されたピットは、やはり媒体の回転下、読出し
光の反射光の差を検出することによって行われる。
The medium of the present invention, generally under rotation,
The recording film is irradiated with recording light in a pulsed manner. At this time, a part of the recording film is melted and removed to form pits. The pits thus formed are formed by detecting the difference in the reflected light of the read light while the medium is rotating.

【0028】[0028]

【実施例】以下、具体的実施例を示して本発明をさらに
詳細に説明する。本発明サンプルの作製 下記式で特定されるフタロシアニン色素をジアセトンア
ルコール溶媒中に溶かして、記録膜塗布溶液を作製し
た。なお、フタロシアニン色素の濃度は65mg/ml
となるように調製した。この記録膜塗布溶液を、直径1
2cm、厚さ1.2mmのポリカーボネート(PC)基
板11上に、スピンコート法により約2000オングス
トローム(光学濃度:1.4Abs )の厚さに塗設し、そ
の後、70℃、10min のベイクをし、記録膜12を形
成した。
EXAMPLES The present invention will be described in more detail with reference to specific examples. Preparation of Sample of the Present Invention A phthalocyanine dye specified by the following formula was dissolved in a diacetone alcohol solvent to prepare a recording film coating solution. The concentration of phthalocyanine dye is 65 mg / ml.
Was prepared so that This coating solution for recording film was
A polycarbonate (PC) substrate 11 having a thickness of 2 cm and a thickness of 1.2 mm was coated by a spin coating method to a thickness of about 2000 angstrom (optical density: 1.4 Abs), and then baked at 70 ° C. for 10 min. The recording film 12 was formed.

【0029】[0029]

【化2】 この記録膜12の上に、Auからなる光反射膜13を、
1000オングストロームの厚さに抵抗加熱型真空蒸着
法で成膜した。この光反射膜13の上に最内層の保護膜
構成層31および他の保護膜構成層32を以下の手順で
積層した。
[Chemical 2] A light reflection film 13 made of Au is formed on the recording film 12.
A film having a thickness of 1000 angstrom was formed by a resistance heating vacuum deposition method. An innermost protective film constituting layer 31 and another protective film constituting layer 32 were laminated on the light reflecting film 13 by the following procedure.

【0030】保護膜構成層31の成分として、エラスト
マー(Quinbeam ZF52-3F,日本ゼオン(株),Tg= -22
℃)を回転数5800 rpm,30sec ,塗液5ccの塗布条件
でスピンコートしたのち、80W/cm高圧水銀灯下にて
硬化させた。
As a component of the protective film constituting layer 31, an elastomer (Quinbeam ZF52-3F, Nippon Zeon Co., Ltd., Tg = -22)
C.) was spin-coated at a rotation speed of 5800 rpm for 30 seconds and a coating liquid of 5 cc, and then cured under a high pressure mercury lamp of 80 W / cm.

【0031】保護膜構成層32の成分として、紫外線硬
化型アクリレート(SD-301, 大日本インキ化学工業
(株),Tg= 120 ℃)を回転数5800 rpm,30sec ,塗
液2ccの塗布条件でスピンコートしたのち、80W/cm
高圧水銀灯下にて硬化させた。
UV-curable acrylate (SD-301, Dainippon Ink and Chemicals, Inc., Tg = 120 ° C.) was used as a component of the protective film-constituting layer 32 under the coating conditions of 5800 rpm for 30 seconds and 2 cc of coating liquid. After spin coating, 80W / cm
It was cured under a high pressure mercury lamp.

【0032】比較サンプルの作製 比較サンプルとして、保護膜構成層31を形成せず、そ
れ以外は上記本発明サンプルと同様にしてサンプルを作
製した。なお、保護膜構成層31を設けなかったので、
それに見合うだけの保護膜構成層32膜厚とした。
Preparation of Comparative Sample As a comparative sample, a sample was prepared in the same manner as the sample of the present invention except that the protective film constituting layer 31 was not formed. Since the protective film constituent layer 31 was not provided,
The thickness of the protective film constituting layer 32 was set to be commensurate with that.

【0033】これら2つのサンプルについて、 記録条件:L.V.(線速)=1.4m/s,λ=78
5nm,N.A.=0.5,記録パワー=9.0mW の条件のもとにEFM信号を記録し、再生条件:L.
V.(線速)=1.4m/s,λ=778nm,N.
A.=0.45,再生パワー=0.3mW の条件のもとに再生を行い、BLER(ブロックエラー
レート)を測定し、初期値とした。その後、70℃,9
0%RHの環境下に1000時間放置した後、上記再生
条件と同条件のもとで再生を行い、BLERの経時変化
を測定した。
Recording conditions for these two samples are as follows: V. (Line speed) = 1.4 m / s, λ = 78
5 nm, N.W. A. = 0.5, recording power = 9.0 mW, the EFM signal was recorded, and the reproduction condition: L.P.
V. (Linear velocity) = 1.4 m / s, λ = 778 nm, N.V.
A. = 0.45, reproduction power = 0.3 mW, reproduction was carried out under the conditions, and BLER (block error rate) was measured and set as the initial value. After that, 70 ℃, 9
After being left in an environment of 0% RH for 1000 hours, reproduction was performed under the same conditions as the above-mentioned reproduction conditions, and the change in BLER with time was measured.

【0034】結果を下記表1に示す。The results are shown in Table 1 below.

【0035】[0035]

【表1】 表1の結果より、本発明の効果は明らかである。すなわ
ち、比較サンプルは、BLERが初期値の1000倍程
度増加するのに対し、本発明のサンプルは、高温高湿度
下の環境下に長時間放置してもBLERの増加はあまり
見られず、極めて耐候性に優れることが分かった。
[Table 1] From the results in Table 1, the effect of the present invention is clear. That is, the BLER of the comparative sample increases about 1000 times the initial value, whereas the BLER of the sample of the present invention does not increase so much even when left for a long time in an environment of high temperature and high humidity, which is extremely high. It was found that the weather resistance was excellent.

【0036】[0036]

【発明の効果】本発明の光記録媒体は、光透過性の基板
と、この基板の上に形成された有機色素を含有する記録
膜と、この記録膜の上に形成された光反射膜と、この光
反射膜の上に形成された保護膜とを備える光記録媒体で
あって、前記保護膜は、少なくとも2層以上の積層体構
造をなし、光反射膜側の最内層の保護膜構成層が、他の
保護膜構成層よりも硬度が低いように構成しているの
で、高温高湿度下等の劣悪な環境下においても、記録後
の記録特性の劣化が生ぜず耐候性に優れた効果を奏す
る。
The optical recording medium of the present invention comprises a light-transmissive substrate, a recording film containing an organic dye formed on the substrate, and a light-reflecting film formed on the recording film. An optical recording medium comprising a protective film formed on the light reflecting film, wherein the protective film has a laminated structure of at least two layers, and a protective film structure of an innermost layer on the light reflecting film side. Since the layer is configured to have lower hardness than other protective film constituent layers, it has excellent weather resistance without deterioration of recording characteristics after recording even under bad environment such as high temperature and high humidity. Produce an effect.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の光記録媒体の部分拡大断面図である。FIG. 1 is a partially enlarged sectional view of an optical recording medium of the present invention.

【符号の説明】[Explanation of symbols]

1…光記録媒体 11…光透過性の基板 12…記録膜 13…光反射膜 30…保護膜 31…最内層の保護膜構成層 32…他の保護膜構成層 DESCRIPTION OF SYMBOLS 1 ... Optical recording medium 11 ... Light transmissive substrate 12 ... Recording film 13 ... Light reflecting film 30 ... Protective film 31 ... Innermost protective film constituent layer 32 ... Other protective film constituent layers

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 // C09B 47/04 7306−4H (72)発明者 宮寺 敏之 埼玉県鶴ケ島市富士見6丁目1番1号 パ イオニア株式会社総合研究所内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Internal reference number FI technical display location // C09B 47/04 7306-4H (72) Inventor Toshiyuki Miyadera 6-1, Fujimi, Tsurugashima City, Saitama Prefecture No. 1 Pioneer Corporation Research Institute

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 光透過性の基板と、この基板の上に形成
された有機色素を含有する記録膜と、この記録膜の上に
形成された光反射膜と、この光反射膜の上に形成された
保護膜とを備える光記録媒体であって、 前記保護膜は、少なくとも2層以上の積層体構造をな
し、光反射膜側の最内層の保護膜構成層が、他の保護膜
構成層よりも硬度が低いことを特徴とする光記録媒体。
1. A light transmissive substrate, a recording film containing an organic dye formed on the substrate, a light reflection film formed on the recording film, and a light reflection film formed on the light reflection film. An optical recording medium comprising a formed protective film, wherein the protective film has a laminated structure of at least two layers, and the innermost protective film constituent layer on the light reflecting film side has another protective film structure. An optical recording medium having a hardness lower than that of the layer.
【請求項2】 前記光反射膜側の最内層の保護膜構成層
は、エラストマーであることを特徴とする請求項1記載
の光記録媒体。
2. The optical recording medium according to claim 1, wherein the protective film constituting layer of the innermost layer on the light reflecting film side is an elastomer.
【請求項3】 前記有機色素は、フタロシアニン色素で
あることを特徴とする請求項1または請求項2に記載の
光記録媒体。
3. The optical recording medium according to claim 1, wherein the organic dye is a phthalocyanine dye.
JP4294321A 1992-11-02 1992-11-02 Optical recording medium Pending JPH06150379A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4294321A JPH06150379A (en) 1992-11-02 1992-11-02 Optical recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4294321A JPH06150379A (en) 1992-11-02 1992-11-02 Optical recording medium

Publications (1)

Publication Number Publication Date
JPH06150379A true JPH06150379A (en) 1994-05-31

Family

ID=17806189

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4294321A Pending JPH06150379A (en) 1992-11-02 1992-11-02 Optical recording medium

Country Status (1)

Country Link
JP (1) JPH06150379A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6300039B1 (en) * 1994-03-25 2001-10-09 Toray Industries, Inc. Optical recording medium
WO2003021587A1 (en) * 2001-08-31 2003-03-13 Tdk Corporation Optical recording medium and production method therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6300039B1 (en) * 1994-03-25 2001-10-09 Toray Industries, Inc. Optical recording medium
WO2003021587A1 (en) * 2001-08-31 2003-03-13 Tdk Corporation Optical recording medium and production method therefor
US6924019B2 (en) 2001-08-31 2005-08-02 Tdk Corporation Optical recording medium and production method therefor

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