JPH05104861A - Optical recording medium - Google Patents
Optical recording mediumInfo
- Publication number
- JPH05104861A JPH05104861A JP3300991A JP30099191A JPH05104861A JP H05104861 A JPH05104861 A JP H05104861A JP 3300991 A JP3300991 A JP 3300991A JP 30099191 A JP30099191 A JP 30099191A JP H05104861 A JPH05104861 A JP H05104861A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- recording medium
- optical recording
- recording layer
- dye
- 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
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はレーザ光を吸収して熱に
変換する有機色素を記録層に含ませた光記録媒体に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium having a recording layer containing an organic dye that absorbs laser light and converts it into heat.
【０００２】[0002]
【従来の技術】１回だけ書込みができる追記型の光記録
媒体として、特開昭５８−１８３２９６号に開示される
ように、透明基体の表面に光吸収体を樹脂中に含浸させ
た記録層を形成し、この記録層の表面に金属反射膜を形
成したものが知られている。そして、上記の光吸収体と
して従来から有機色素が用いられている。2. Description of the Related Art As a write-once type optical recording medium that can be written only once, as disclosed in JP-A-58-183296, a recording layer in which a resin is impregnated with a light absorber on the surface of a transparent substrate. It is known that a metal reflective film is formed on the surface of this recording layer. An organic dye has been conventionally used as the light absorber.
【０００３】また日経エレクトロニクス１９８９年１月
２３日号には、コンパクトディスク規格に対応して追記
ないし記録を行なうことのできる光記録ディスクが提案
されている。このものは透明樹脂基板上に、色素層、Ａ
u反射層および保護層をこの順に設層して形成されり。
即ち反射層を色素層に密着して設けるものである。そし
て、この提案はＣＤ用途であり、ＣＤ用途では、光記録
ディスクの色素層に記録レーザ光を照射すると、色素層
が光を吸収し融解ないし分解するとともに基板も軟化し
て、色素材料と、基板材料とが界面で混じりあい、光の
位相差により反射率が下がるピット部が基板と色素層と
の界面に形成されると言われている。従来は、色素層に
ピットを形成するために色素層上に空気層を設けていた
が、この提案では反射層を色素層に密着して設ける密着
型であるので、ＣＤ規格のディスク全厚１．２ｍｍの構
成が可能となっている。In addition, Nikkei Electronics January 23, 1989 issue proposes an optical recording disk capable of additional recording or recording corresponding to the compact disk standard. This is a transparent resin substrate with a dye layer, A
u Form a reflective layer and a protective layer in this order.
That is, the reflective layer is provided in close contact with the dye layer. This proposal is for CD use. In CD use, when the dye layer of an optical recording disk is irradiated with a recording laser beam, the dye layer absorbs the light and melts or decomposes, and the substrate also softens, so that the dye material, It is said that a pit portion where the substrate material mixes with the interface and the reflectance decreases due to the phase difference of light is formed at the interface between the substrate and the dye layer. Conventionally, an air layer is provided on the dye layer in order to form pits in the dye layer. However, in this proposal, the reflective layer is a contact type in which the reflective layer is in close contact with the dye layer. A structure of 0.2 mm is possible.
【０００４】上記の光吸収体としての有機色素は耐光性
に劣り、再生劣化しやすいという問題があり、特にＣＤ
との互換性に好適なシアニン系やフタロシアニン系の有
機色素はこの傾向が顕著である。そこで、記録層に光安
定剤を添加する提案もなされている。The above-mentioned organic dye as a light absorber has a problem that it is inferior in light resistance and is easily deteriorated by reproduction.
This tendency is remarkable in cyanine-based and phthalocyanine-based organic dyes that are suitable for compatibility with. Therefore, it has been proposed to add a light stabilizer to the recording layer.
【０００５】[0005]
【発明が解決しようとする課題】記録層に光安定剤を添
加するには記録材料調製用のアルコールやセロソルブ等
の溶剤に光安定剤を溶解せしめることとなるが、一般に
光安定剤は溶解性が低く充分な量の光安定剤を記録層に
含浸させることができない。また、特殊な方法で光安定
剤を充分に含ませることができても、光学特性や熱的特
性等の記録再生特性に悪影響を及ぼすことになる。To add a light stabilizer to the recording layer, the light stabilizer is dissolved in a solvent such as alcohol or cellosolve for preparing a recording material. Generally, the light stabilizer is soluble. However, the recording layer cannot be impregnated with a sufficient amount of the light stabilizer. Even if the light stabilizer can be sufficiently contained by a special method, the recording and reproducing characteristics such as optical characteristics and thermal characteristics are adversely affected.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決すべく本
発明は、透明基体の表面に有機色素からなる若しくは有
機色素を含む記録層を形成し、この記録層の表面に金属
反射膜を形成した光記録媒体において、前記金属反射膜
の少なくとも記録層に接する側の層にクエンチャー効果
つまり有機色素の退色抑制効果を発揮する金属としてＣ
u、Ｎi、Ｃo、Ｐtまたはこれらの金属の合金を１種以上
含ませた。In order to solve the above problems, the present invention forms a recording layer made of an organic dye or containing an organic dye on the surface of a transparent substrate, and forming a metal reflection film on the surface of this recording layer. In the above optical recording medium, C is used as a metal exhibiting a quencher effect, that is, an effect of suppressing fading of the organic dye, in at least a layer of the metal reflection film which is in contact with the recording layer.
At least one of u, Ni, Co, Pt, and alloys of these metals was included.
【０００７】[0007]
【作用】有機色素、光安定剤を溶剤に溶かし、これをＰ
ＭＭＡやＰＣ等の透明基体に塗布し、更に乾燥させた後
にスパッタリング等で金属反射膜を形成する。Function: Dissolve organic dye and light stabilizer in a solvent,
It is applied to a transparent substrate such as MMA or PC, dried, and then a metal reflection film is formed by sputtering or the like.
【０００８】[0008]
【実施例】以下に本発明の実施例を添付図面に基づいて
説明する。図１は本発明に係る光記録媒体の拡大断面図
であり、光記録媒体はＰＭＭＡ（ポリメチルメタアクリ
レート）やＰＣ（ポリカーボネイト）等の透明基体１の
表面に記録層２を形成し、この記録層２の表面に金属反
射膜３を形成し、更にこの金属反射膜３の上に保護層４
を形成している。ここで、記録層２は有機色素を塗布す
ることで形成し、金属反射膜３は図示の如く複数の層３
ａまたは単一の層をスパッタリングで形成し、また透明
基体１の上に更に下地層を形成してもよい。そして、以
上の構成からなる光記録媒体は透明基体１を通して記録
層２にレーザ光を照射すると、記録層２に含まれる有機
色素がレーザ光を吸収して加熱融解してこの部分がピッ
トになる。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an enlarged cross-sectional view of an optical recording medium according to the present invention. In the optical recording medium, a recording layer 2 is formed on the surface of a transparent substrate 1 such as PMMA (polymethylmethacrylate) or PC (polycarbonate). A metal reflection film 3 is formed on the surface of the layer 2, and a protective layer 4 is formed on the metal reflection film 3.
Is formed. Here, the recording layer 2 is formed by applying an organic dye, and the metal reflection film 3 is formed of a plurality of layers 3 as illustrated.
A or a single layer may be formed by sputtering, and an underlayer may be further formed on the transparent substrate 1. When the recording layer 2 is irradiated with the laser beam through the transparent substrate 1 in the optical recording medium having the above structure, the organic dye contained in the recording layer 2 absorbs the laser beam and heats and melts to form pits. .
【０００９】記録層２に含まれる有機色素としてはシア
ニン系色素（ポリメチン系色素）、フタロシアニン系色
素、スクアリリウム系色素、チオール金属（Ｎi，Ｐt，
Ｐd等）錯塩、トリアリルメタン系色素、アミニウム系
色素、ジイモニウム系色素、ナフトキノン系色素、アン
トラキノン系色素等を用いるが、ＣＤとの互換性を考慮
するとシアニン系色素またはフタロシアニン系色素、ナ
フタロシアニン系色素を用いるのが有効である。ここ
で、シアニン系色素の一例としてインドレニン型シアニ
ン色素の化学構造式を以下の（化１）に示す。Organic dyes contained in the recording layer 2 include cyanine dyes (polymethine dyes), phthalocyanine dyes, squarylium dyes, and thiol metals (Ni, Pt,
Pd, etc.) complex salts, triallylmethane dyes, aminium dyes, diimonium dyes, naphthoquinone dyes, anthraquinone dyes, etc. are used, but in consideration of compatibility with CD, cyanine dyes or phthalocyanine dyes, naphthalocyanine dyes It is effective to use a dye. Here, the chemical structural formula of an indolenine type cyanine dye as an example of the cyanine dye is shown in the following (Chemical formula 1).
【００１０】[0010]
【化１】 [Chemical 1]
【００１１】また記録層２には光安定剤を含有せしめて
もかまわない。この光安定剤としては金属錯体、第３ア
ミン、カロチン、フェノール、ニトロキシド等のクエン
チャー効果を発揮するものを用い、特にＮi金属錯体、
アミニウム塩及びジイモニウム塩が溶解性と安定剤とし
ての効果の点で好ましい。これらＮi金属錯体、アミニ
ウム塩及びジイモニウム塩の化学構造式を以下の（化
２）、（化３）、（化４）及び（化５）に示す。The recording layer 2 may contain a light stabilizer. As the light stabilizer, a metal complex, a tertiary amine, carotene, phenol, nitroxide or the like which exhibits a quencher effect is used, and particularly, a Ni metal complex,
Aminium salts and diimonium salts are preferable in terms of solubility and effect as a stabilizer. The chemical structural formulas of these Ni metal complex, aminium salt and diimonium salt are shown in the following (formula 2), (formula 3), (formula 4) and (formula 5).
【００１２】[0012]
【化２】 [Chemical 2]
【化３】 [Chemical 3]
【化４】 [Chemical 4]
【化５】 [Chemical 5]
【００１３】また、前記光安定剤と共に添加することで
耐光性を向上させる物質として、モノアゾ系色素とＣ
r、Ｃo等の金属が２：１の比率で錯体を形成しているモ
ノアゾ金属錯塩を添加してもよい。Further, as a substance for improving the light resistance by adding together with the light stabilizer, a monoazo dye and C
A monoazo metal complex salt in which a metal such as r or Co forms a complex at a ratio of 2: 1 may be added.
【００１４】金属反射膜３はクエンチャー効果を発揮す
る金属若しくは合金を含んでいる。この金属（合金）は
金属反射膜３全体に含ませてもよいが、複数の層３ａか
らなる場合には少なくとも記録層２に接する層にクエン
チャー効果を発揮する金属を含有せしめればよい。The metal reflection film 3 contains a metal or an alloy exhibiting a quencher effect. This metal (alloy) may be contained in the entire metal reflection film 3, but in the case of being composed of a plurality of layers 3a, at least the layer in contact with the recording layer 2 may contain a metal exhibiting a quencher effect.
【００１５】ここで、クエンチャー効果を発揮する金属
としてはＣu、Ｎi、Ｃo、Ｐtの他に、これらの金属の合
金が挙げられる。例えばＡl、Ｚn、Ｓn、Ｎi、Ｂe、Ａu
及びＡgのうちの少なくとも１種とＣuとの合金、或いは
Ｃu−Ｚn−Ｓn合金、Ｃu−Ｚn−Ａl合金、Ｃu−Ｓn−Ａ
l合金、Ｃu−Ｓn−Ｐ合金、Ｃu−Ｓn−Ｎi合金等があ
る。Here, examples of the metal exhibiting the quencher effect include Cu, Ni, Co, and Pt, as well as alloys of these metals. For example, Al, Zn, Sn, Ni, Be, Au
And an alloy of at least one of Ag and Cu, or a Cu-Zn-Sn alloy, a Cu-Zn-Al alloy, a Cu-Sn-A.
1 alloy, Cu-Sn-P alloy, Cu-Sn-Ni alloy and the like.
【００１６】次に本発明の具体例と従来例とを比較す
る。 （具体例）以下の色素等を（表１）に示す重量比でエチ
ルセロソルブ、ジアセトンアルコール、フロロアルコー
ル等に溶解し、直径１２０ｍｍの案内溝付きＰＣ基板に
数十〜数百ｎｍの厚さに塗布し乾燥せしめて記録層を形
成した。 シアニン色素（日本感光色素研究所製；インドレニン型
シアニン色素） フタロシアニン色素（日本ビクター製） モノアゾ系金属錯塩（日本化薬製；Kayaset Yellow K-C
L 田岡化学製；Oleosol Fast Yellow GCN） アミニウム塩（日本化薬製；Kayaset IRG002 IRG002EIR
G003 IRG007 IRG007IRG008） Ｎi錯体（三井東圧製；PA1006）Next, a concrete example of the present invention and a conventional example will be compared. (Specific example) The following dyes are dissolved in ethyl cellosolve, diacetone alcohol, fluoroalcohol, etc. in the weight ratio shown in (Table 1), and the thickness of several tens to several hundreds nm is applied to a PC substrate with a guide groove having a diameter of 120 mm. And then dried to form a recording layer. Cyanine dye (manufactured by Japan Photosensitive Dye Research Institute; indolenine type cyanine dye) Phthalocyanine dye (manufactured by Victor Company of Japan) Monoazo metal complex salt (manufactured by Nippon Kayaku; Kayaset Yellow KC)
L Taoka Chemical; Oleosol Fast Yellow GCN) Aminium salt (Nippon Kayaku; Kayaset IRG002 IRG002EIR)
G003 IRG007 IRG007IRG008) Ni complex (Mitsui Toatsu; PA1006)
【００１７】上記によって得られたＰＣ基板の記録層の
上にスパッタリングにより（表２）の組成の金属反射膜
を５０〜１００ｎｍ成膜し、その上をトップコート（Ｕ
Ｖ硬化樹脂）で保護し光ディスク（光記録媒体）を得
た。On the recording layer of the PC substrate obtained as described above, a metal reflection film having a composition shown in Table 2 (50 to 100 nm) was formed by sputtering, and a top coat (U) was formed thereon.
An optical disk (optical recording medium) was obtained by protecting with V-curing resin.
【００１８】[0018]
【表１】 [Table 1]
【表２】 [Table 2]
【００１９】このようにして得られた光ディスクを１．
２〜１．４ｍ／ｓで回転させ、半導体レーザ（７８０〜
７９０ｎｍ）により７〜８ｍＷでＥＦＭ信号を記録し、
その後キセノンロングライフウェザーメータ（スガ試験
機（株）製 WEL-6X-LHP-B・Ec・S）を用いて、光照射エ
ネルギ１０００〜１２００kJ/h、 温度６０℃、湿度７
５％で耐光性試験を行ない５〜１０時間毎のＣ１エラー
を測定した。その結果を図２〜図９に示す。The optical disk thus obtained was 1.
The semiconductor laser (780-780) is rotated at 2-1.4 m / s.
790 nm) to record the EFM signal at 7-8 mW,
After that, using a xenon long life weather meter (WEL-6X-LHP-B / Ec / S manufactured by Suga Test Instruments Co., Ltd.), light irradiation energy 1000 to 1200 kJ / h, temperature 60 ° C., humidity 7
A light resistance test was conducted at 5%, and a C1 error was measured every 5 to 10 hours. The results are shown in FIGS.
【００２０】図２〜図９からクエンチャー効果を有する
金属反射膜あるいはそれらに金属を含む反射膜を有機色
素記録層に隣接させることで耐光性が大巾に向上する。
特に光安定剤とモノアゾ金属錯塩を有機色素記録層中に
含有させた場合に相乗効果によりその効果が大きい。From FIGS. 2 to 9, the light resistance is greatly improved by adjoining a metal reflection film having a quencher effect or a reflection film containing a metal thereto to the organic dye recording layer.
In particular, when a light stabilizer and a monoazo metal complex salt are contained in the organic dye recording layer, the effect is large due to the synergistic effect.
【００２１】[0021]
【発明の効果】以上の説明及び図２乃至図９の試験結果
からも明らかなように本発明によれば、光記録媒体の記
録層の表面に形成される金属反射膜の少なくとも記録層
に接する部分にＣu、Ｎi、Ｃo、Ｐtまたはこれらの金属
の合金を含ませるようにしたので、記録層中の有機色素
の退色が効果的に抑制でき、記録再生特性が向上する。As is apparent from the above description and the test results of FIGS. 2 to 9, according to the present invention, at least the recording layer of the metal reflective film formed on the surface of the recording layer of the optical recording medium is in contact with the recording layer. Since Cu, Ni, Co, Pt or an alloy of these metals is included in the portion, fading of the organic dye in the recording layer can be effectively suppressed, and the recording / reproducing characteristics are improved.
【図１】本発明に係る光記録媒体の拡大断面図FIG. 1 is an enlarged sectional view of an optical recording medium according to the present invention.
【図２】本発明と従来の光記録媒体をＣ１エラーと試験
時間の関係で比較したグラフFIG. 2 is a graph comparing the present invention and a conventional optical recording medium in relation to C1 error and test time.
【図３】本発明と従来の光記録媒体をＣ１エラーと試験
時間の関係で比較したグラフFIG. 3 is a graph comparing the present invention and a conventional optical recording medium in relation to C1 error and test time.
【図４】本発明と従来の光記録媒体をＣ１エラーと試験
時間の関係で比較したグラフFIG. 4 is a graph comparing the present invention and a conventional optical recording medium in relation to C1 error and test time.
【図５】本発明と従来の光記録媒体をＣ１エラーと試験
時間の関係で比較したグラフFIG. 5 is a graph comparing the present invention and a conventional optical recording medium in relation to C1 error and test time.
【図６】本発明と従来の光記録媒体をＣ１エラーと試験
時間の関係で比較したグラフFIG. 6 is a graph comparing the present invention and a conventional optical recording medium in relation to C1 error and test time.
【図７】本発明と従来の光記録媒体をＣ１エラーと試験
時間の関係で比較したグラフFIG. 7 is a graph comparing the present invention and a conventional optical recording medium in relation to C1 error and test time.
【図８】本発明と従来の光記録媒体をＣ１エラーと試験
時間の関係で比較したグラフFIG. 8 is a graph comparing the present invention and a conventional optical recording medium in relation to C1 error and test time.
【図９】本発明と従来の光記録媒体をＣ１エラーと試験
時間の関係で比較したグラフFIG. 9 is a graph comparing the present invention and a conventional optical recording medium in relation to C1 error and test time.
１…透明基体、２…記録層、３…金属反射膜、３ａ…金
属反射膜の記録層に接する層、４…保護膜。1 ... Transparent substrate, 2 ... Recording layer, 3 ... Metal reflective film, 3a ... Layer in contact with recording layer, 4 ... Protective film.
Claims (5)
くは有機色素を含む記録層を形成し、この記録層の表面
に金属反射膜を形成した光記録媒体において、前記金属
反射膜の少なくとも記録層に接する側の層はＣu、Ｎi、
Ｃo、Ｐtまたはこれらの金属の合金を１種以上含むこと
を特徴とする光記録媒体。1. An optical recording medium in which a recording layer made of or containing an organic dye is formed on the surface of a transparent substrate, and a metal reflection film is formed on the surface of this recording layer, at least the recording layer of the metal reflection film. The layer on the side in contact with Cu, Ni,
An optical recording medium comprising Co, Pt or one or more kinds of alloys of these metals.
e、Ａu及びＡgのうちの少なくとも１種とＣuとの合金で
あることを特徴とする請求項１に記載の光記録媒体。2. The Cu alloy is Al, Zn, Sn, Ni, B.
The optical recording medium according to claim 1, which is an alloy of Cu with at least one of e, Au, and Ag.
−Ｚn−Ａl合金、Ｃu−Ｓn−Ａl合金、Ｃu−Ｓn−Ｐ合
金またはＣu−Ｓn−Ｎi合金であることを特徴とする請
求項１に記載の光記録媒体。3. The Cu alloy is a Cu—Zn—Sn alloy, Cu.
The optical recording medium according to claim 1, which is a -Zn-Al alloy, a Cu-Sn-Al alloy, a Cu-Sn-P alloy, or a Cu-Sn-Ni alloy.
シアニン系色素であることを特徴とする請求項１乃至請
求項３に記載の光記録媒体。4. The optical recording medium according to claim 1, wherein the organic dye is a cyanine dye or a phthalocyanine dye.
を特徴とする請求項１乃至請求項４に記載の光記録媒
体。5. The optical recording medium according to claim 1, wherein the recording layer contains a light stabilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3300991A JPH05104861A (en) | 1991-10-21 | 1991-10-21 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3300991A JPH05104861A (en) | 1991-10-21 | 1991-10-21 | Optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05104861A true JPH05104861A (en) | 1993-04-27 |
Family
ID=17891516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3300991A Pending JPH05104861A (en) | 1991-10-21 | 1991-10-21 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05104861A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002091043A1 (en) * | 2001-05-01 | 2002-11-14 | Bridgestone Corporation | Near infrared absorbing films |
| US20110051584A1 (en) * | 2009-08-31 | 2011-03-03 | Moser Baer India Limited | Optical recording mediums |
-
1991
- 1991-10-21 JP JP3300991A patent/JPH05104861A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002091043A1 (en) * | 2001-05-01 | 2002-11-14 | Bridgestone Corporation | Near infrared absorbing films |
| US7018714B2 (en) | 2001-05-01 | 2006-03-28 | Bridgestone Corporation | Near-infrared absorption film |
| US20110051584A1 (en) * | 2009-08-31 | 2011-03-03 | Moser Baer India Limited | Optical recording mediums |
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