JPH03203690A - Optical recording medium - Google Patents
Optical recording mediumInfo
- Publication number
- JPH03203690A JPH03203690A JP1341631A JP34163189A JPH03203690A JP H03203690 A JPH03203690 A JP H03203690A JP 1341631 A JP1341631 A JP 1341631A JP 34163189 A JP34163189 A JP 34163189A JP H03203690 A JPH03203690 A JP H03203690A
- Authority
- JP
- Japan
- Prior art keywords
- recording film
- recording medium
- optical recording
- quencher
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 19
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 229920003023 plastic Polymers 0.000 claims abstract description 7
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 claims abstract description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims description 28
- 239000000975 dye Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims 1
- 239000002904 solvent Substances 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 abstract description 3
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052736 halogen Inorganic materials 0.000 abstract description 3
- 150000002367 halogens Chemical group 0.000 abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 3
- 239000001257 hydrogen Substances 0.000 abstract description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 abstract description 3
- 238000004042 decolorization Methods 0.000 abstract description 2
- 238000004040 coloring Methods 0.000 abstract 3
- 239000011347 resin Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 229910052714 tellurium Inorganic materials 0.000 description 3
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- HJOVHMDZYOCNQW-UHFFFAOYSA-N isophorone Chemical compound CC1=CC(=O)CC(C)(C)C1 HJOVHMDZYOCNQW-UHFFFAOYSA-N 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、光記録媒体、特に有機系色素を含有する記録
膜を有する光記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical recording medium, and particularly to an optical recording medium having a recording film containing an organic dye.
光記録媒体は、一般に記憶容量が大きく、しかも書き込
みまたは読み出しが非接触で行なわれる等、優れた特徴
を備えており、その開発が従来から活発に行なわれてき
ている。2. Description of the Related Art Optical recording media generally have a large storage capacity and have excellent features such as being able to be written or read without contact, and have been actively developed.
このような光記録媒体の１例として、例えば追記型光デ
ィスクがあり、このものは、記録膜の微少面積にレーザ
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）記録し、未記録部分と
の反射光量の違いによって再生を行うようにしている。An example of such an optical recording medium is a write-once optical disc, which focuses a laser beam on a minute area of a recording film and converts it into thermal energy, changing the properties of the recording film. (Pit formation) Recording is performed, and reproduction is performed based on the difference in the amount of reflected light from the unrecorded portion.
このような媒体の記録膜の材質としては、大きな反射率
変化を与えるものが好ましく、当初はテルル系の低融点
金属材料が先行して用いられていた。The material for the recording film of such a medium is preferably a material that provides a large change in reflectance, and tellurium-based low melting point metal materials were initially used.
しかし、近年テルル系材料が有害であること、そして、
より高感度化する必要があること、より製造コストを安
価にする必要があることから、テルル系材料にかえ、色
素を主とした有機材料系の記録膜を用いた光記録媒体の
提案がなされている（特開昭第５８−１１２７９０号公
報、同第５８１１４９８９号公報、同第５８−１２５２
４６号公報、同第６Ｃ）−７１２９５号公報等）。However, in recent years, tellurium-based materials have become harmful, and
Because of the need for higher sensitivity and lower manufacturing costs, proposals have been made for optical recording media that use recording films made of organic materials, mainly dyes, instead of tellurium-based materials. (Japanese Unexamined Patent Publication No. 58-112790, No. 58114989, No. 58-1252)
46 Publication, 6C)-71295 Publication, etc.).
このような色素を主とした有機材料系の記録膜を用いる
光記録媒体は、一般に基板と、グループおよびアドレス
を形成するためにこの基板上に設けられた紫外線硬化型
樹脂層（２Ｐ層）と、この紫外線硬化型樹脂層の上にス
ピンコード法により形成された記録膜を備えている。An optical recording medium using such a recording film made of an organic material mainly containing a dye generally consists of a substrate and an ultraviolet curable resin layer (2P layer) provided on the substrate to form groups and addresses. , a recording film formed by a spin code method is provided on this ultraviolet curable resin layer.
しかしながら、上記２Ｐ層を有する基板は、例えばＮｉ
スタンバ上に紫外線硬化型樹脂を滴下し、その上に基板
をのせ、スタンパと基板との間に気泡が残らないように
しながら、紫外線硬化型樹脂を十分に薄くのばした後、
基板の上から紫外線を照射して紫外線硬化型樹脂を重合
、硬化させることによって形成される。そのため、作業
工程がきわめて煩雑となり、生産性の向上が図れないと
いう問題が生じる。このような問題を解決するための一
つの方策として、上記の紫外線硬化型樹脂を用いずにグ
ループ等を備えたプラスチック基板を射出成形により一
体成形した、いわゆる射出成形基板の使用が考えられる
。However, the substrate having the 2P layer is made of, for example, Ni
Drop the UV curable resin onto the stamper, place the substrate on top of it, and spread the UV curable resin sufficiently thinly while making sure that no air bubbles remain between the stamper and the substrate.
It is formed by irradiating ultraviolet rays from above the substrate to polymerize and harden the ultraviolet curable resin. Therefore, a problem arises in that the work process becomes extremely complicated and productivity cannot be improved. One possible solution to this problem is to use a so-called injection-molded substrate, in which a plastic substrate with groups and the like is integrally molded by injection molding without using the above-mentioned ultraviolet curable resin.
しかしながら、この射出成形基板では、このものの表面
（グループ側）に直接記録膜が塗膜されるため、一般に
、塗膜時に含有される溶媒によって基板がダメージを受
け、実用に耐えないという問題が生しる。However, with this injection molded substrate, since the recording film is directly coated on the surface (group side) of the substrate, the problem arises that the substrate is generally damaged by the solvent contained in the coating, making it unsuitable for practical use. Sign.
そこで、本発明は、上記の問題点を解決し、射出成形基
板にダメージを与えることなく、しかも記録再生等の特
性にも優れる記録膜を備えた光記録媒体を提供すること
を目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and provide an optical recording medium equipped with a recording film that does not damage an injection molded substrate and has excellent recording and reproduction characteristics.
このような課題を解決するため、本発明は、プラスチッ
ク基板上に記録膜を有する光記録媒体において、前記記
録膜は、下記一般式
で表わされるンアニン系色素（式中Ｒ１およびＲ９は、
それぞれ炭素数３〜６のアルキル基を表わす）と、下記
一般式
で表されるクエンチャ（式中Ｒ３〜ＲＩＯはそれぞれ、
水素、アルキル基またはアリル基を表わし、式中Ｘはハ
ロゲンを表す）を含有するように構成した。In order to solve such problems, the present invention provides an optical recording medium having a recording film on a plastic substrate, in which the recording film is composed of an anine-based dye represented by the following general formula (wherein R1 and R9 are
each represents an alkyl group having 3 to 6 carbon atoms), and a quencher represented by the following general formula (in the formula, R3 to RIO are each represented by
represents hydrogen, an alkyl group, or an allyl group, in which X represents a halogen).
本発明に用いられるプラスチック基板は、生産性向上の
観点から、いわゆる射出成形基板が用いられる。射出成
形基板とは、平板状の基板と、この基板の片面に設けら
れるグループ、アドレス等とを同一材料で一体的にワン
ショットの射出成形で形成した基板をいう。The plastic substrate used in the present invention is a so-called injection molded substrate from the viewpoint of improving productivity. An injection molded board is a board in which a flat board and groups, addresses, etc. provided on one side of the board are integrally formed from the same material by one-shot injection molding.
このような基板は、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）等のプラ
スチック材料から形成される。Such a substrate is made of, for example, polycarbonate resin (PC
), polymethyl methacrylate resin (PMMA), and other plastic materials.
このような基板上には、記録膜が成膜され、この記録膜
には下記一般式［Ｉ］で表わされるシアニン系色素が含
有される。A recording film is formed on such a substrate, and this recording film contains a cyanine dye represented by the following general formula [I].
一般式［Ｉ］
一般式［１１］
上記一般式［Ｉ］において、ＲおよびＲ２は、それぞれ
炭素数３〜６のアルキル基を表わす。この炭素数が３未
満となると、後述する溶媒への溶解性がなくなり、成膜
ができない。この炭素数が６を超えると、これもまた同
様に難溶性を示し成膜ができない。General Formula [I] General Formula [11] In the above General Formula [I], R and R2 each represent an alkyl group having 3 to 6 carbon atoms. If the number of carbon atoms is less than 3, the solubility in the solvent described below will be lost and film formation will not be possible. If the number of carbon atoms exceeds 6, it also exhibits poor solubility and cannot be formed into a film.
さらに本発明の記録膜には、下記一般式［１１］で示さ
れるクエンチャが含有される。Further, the recording film of the present invention contains a quencher represented by the following general formula [11].
式［’ＩＩ］においてＲ３〜ＲＩＯはそれぞれ、水素、
アルキル基またはアリル基を表わし、式中Ｘはハロゲン
を表す。In formula ['II], R3 to RIO each represent hydrogen,
It represents an alkyl group or an allyl group, and in the formula, X represents a halogen.
このようなりエンチャは、光安定性を増し、特に読み出
し光による脱色（再生劣化）を防止するために用いられ
る。Such an encher is used to increase photostability and, in particular, to prevent decolorization (reproduction deterioration) caused by readout light.
このようなりエンチャおよび前記シアニン系色素を含有
する記録膜は、例えばスピンコード法等の常用手段によ
り塗設される。塗設される記録膜の厚さは４０〜１１０
０ｎ程度である。なお、塗布に用いる溶媒としては、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、メタノール等が挙げられる。これら
の溶媒は、記録膜が設けられる基板にダメージを与えな
いので好適である。The recording film containing the encher and the cyanine dye is coated by a conventional method such as a spin-coating method. The thickness of the recording film coated is 40 to 110
It is about 0n. Note that examples of the solvent used for coating include diacetone alcohol, ethyl cellosolve, methyl cellosolve, isophorone, methanol, and the like. These solvents are suitable because they do not damage the substrate on which the recording film is provided.
本発明の記録媒体に適用されるレーザ光は使用色素の吸
収波長に応じて適宜、選択されるが、中でも半導体レー
ザ（波長７６０〜８３０ｎｍ）が好ましい。The laser beam applied to the recording medium of the present invention is appropriately selected depending on the absorption wavelength of the dye used, and among them, a semiconductor laser (wavelength: 760 to 830 nm) is preferable.
本発明の記録媒体は、前述したように、いわゆる射出成
形基板上に記録膜を設けて形成されるが、通常は、この
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することが好ましい。As mentioned above, the recording medium of the present invention is formed by providing a recording film on a so-called injection molded substrate, but usually two of these are prepared and the recording film is placed facing each other. A sandwich structure is preferred.
本発明の媒体には、一般に回転下において、記録光がパ
ルス状に照射される。The medium of the present invention is generally irradiated with recording light in a pulsed manner while being rotated.
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。At this time, part of the recording film is melted and removed to form pits.
このように形成されたピットは、やはり媒体の回転下、
読み出し光の反射光の差を検出することによって行なわ
れる。The pits formed in this way are also caused by the rotation of the medium.
This is done by detecting the difference in the reflected light of the read light.
以下、本発明の実施例を示して本発明をさらに詳細に説
明する。Hereinafter, the present invention will be explained in further detail by showing examples of the present invention.
記録膜に含有される色素としては、以下に示される［Ｄ
−１］〜［Ｄ−５］を用い、クエンチャとしては、以下
に示される［Ｑ−１］または［Ｑ＊］を用い、これらを
下記表１に示される溶媒中に溶解し、直径１３ａｎのポ
リカーボネート（ｐ ｃ）基板上に、６０ｎｍの厚さに
塗設し、種々の光記録媒体サンプルを作製した。The dyes contained in the recording film include the following [D
-1] to [D-5], and as a quencher, use [Q-1] or [Q*] shown below, dissolve them in the solvent shown in Table 1 below, and Various optical recording medium samples were prepared by coating a polycarbonate (PC) substrate to a thickness of 60 nm.
色 素
［Ｄ−１］
上記一般式［１］において、ＲおよびＲ２を、それぞれ
Ｉ Ｃｓ Ｈｚ （イソペンチル基）とした。Dye [D-1] In the above general formula [1], R and R2 are each represented by ICs Hz (isopentyl group).
［Ｄ−２コ
上記一般式［１］において、ＲおよびＲ２をそれぞれＣ
２Ｈｓ （エチル基）とした。[D-2] In the above general formula [1], R and R2 are each C
2Hs (ethyl group).
［Ｄ−３］
上記一般式［Ｉ］において、ＲおよびＲ２を、それぞれ
Ｃ−ｒ Ｈ１５（ヘプチル基）とした。[D-3] In the above general formula [I], R and R2 are each C-r H15 (heptyl group).
［Ｄ−４コ
上記一般式［Ｉ］において、Ｒ１およびＲ２それぞれＣ
Ｈ３（メチル基）とした。[D-4] In the above general formula [I], R1 and R2 each represent C
It was set as H3 (methyl group).
［Ｉ）−５］
を、
上述の方法で作製した光記録媒体サンプルの記録膜構成
およびその評価結果を下記表１に示す。[I)-5] The recording film configuration of the optical recording medium sample prepared by the above method and the evaluation results thereof are shown in Table 1 below.
なお、評価項目としては、色素およびクエンチャの溶解
性、ならびに高温高湿環境下（７０℃、９０％ＲＨ）に
おけるシステム制御信号レベルの変動および記録再生特
性の変化、ならびに繰り返し読出しの繰り返し回数の特
性を評価した。さらに、これらの特性の総合特性も評価
した。The evaluation items include the solubility of dyes and quenchers, fluctuations in system control signal levels and changes in recording and reproducing characteristics under high temperature and high humidity environments (70°C, 90% RH), and characteristics of the number of times of repeated readout. was evaluated. Furthermore, the comprehensive characteristics of these properties were also evaluated.
結果を下記表１に示す。（以下余白）
クエンチャ
［Ｑ−１］
前記一般式［ｎ］で示される商品名ＩＲＧＯ２３（日本
化薬（株）社製））。The results are shown in Table 1 below. (Left below) Quencher [Q-1] Trade name IRGO23 (manufactured by Nippon Kayaku Co., Ltd.) represented by the general formula [n].
［Ｑ＊］
Ｎ”（ｎ−Ｃ４Ｈ９１４
なお、サンプル胤８については、基板材質をサンプルＮ
ａ １〜７の射出成形基板とは変え、いわゆるＰＭＭＡ
と紫外線硬化型樹脂層（２Ｐ層）との組み合せによる基
板とした。[Q*] N” (n-C4H914 For sample seed 8, the substrate material was changed to sample N
a Instead of injection molded substrates 1 to 7, so-called PMMA
A substrate was obtained by combining the above and an ultraviolet curable resin layer (2P layer).
以上の結果より本発明の効果は明らかである。 From the above results, the effects of the present invention are clear.
すなわち、本発明の光記録媒体は、記録膜中に特定のシ
アニン系色素およびクエンチャを含有するので、いわゆ
る射出成形基板にダメージを与えることなく、基板上に
直接塗設することができ、従来の紫外線硬化型樹脂層（
２Ｐ＃）を有する基板を用いた媒体と比べて生産性は格
段と向上する。That is, since the optical recording medium of the present invention contains a specific cyanine-based dye and quencher in the recording film, it can be coated directly onto a so-called injection molded substrate without damaging it, and can be coated directly onto a substrate without damaging the so-called injection molded substrate. UV-curable resin layer (
Productivity is significantly improved compared to a medium using a substrate having 2P#).
しかも記録再生等の特性も極めて優れる。Furthermore, the recording and reproduction characteristics are also extremely excellent.
評価基準 ◎ きわめて良好、Ｏ・・良好、△ 実用レ
ベルでやや問題あり、
Ｘ 実用レベル外Evaluation criteria ◎ Very good, O...Good, △ Somewhat problematic at practical level, X Outside practical level
Claims (1)
て、 前記記録膜は、下記一般式 ▲数式、化学式、表等があります▼ で表わされるシアニン系色素（式中Ｒ＿１およびＲ＿２
は、それぞれ炭素数３〜６のアルキル基を表わす）と、
下記一般式 ▲数式、化学式、表等があります▼ で表されるクエンチャ（式中Ｒ＿３〜Ｒ＿１＿０はそれ
ぞれ、水素、アルキル基またはアリル基を表わし、式中
Ｘはハロゲンを表す）を含有することを特徴とする光記
録媒体。[Scope of Claims] In an optical recording medium having a recording film on a plastic substrate, the recording film contains cyanine dyes (in the formula R_1 and R_2
each represents an alkyl group having 3 to 6 carbon atoms), and
Contains a quencher represented by the following general formula ▲ Numerical formulas, chemical formulas, tables etc. Characteristic optical recording media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1341631A JPH03203690A (en) | 1989-12-29 | 1989-12-29 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1341631A JPH03203690A (en) | 1989-12-29 | 1989-12-29 | Optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03203690A true JPH03203690A (en) | 1991-09-05 |
Family
ID=18347589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1341631A Pending JPH03203690A (en) | 1989-12-29 | 1989-12-29 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03203690A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5506357A (en) * | 1983-01-12 | 1996-04-09 | Tdk Corporation | Cyanine dyes for use in optical recording medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60230891A (en) * | 1984-05-01 | 1985-11-16 | Ricoh Co Ltd | Optical information-recording medium |
| JPS6230088A (en) * | 1985-08-01 | 1987-02-09 | Olympus Optical Co Ltd | Optical memory medium |
-
1989
- 1989-12-29 JP JP1341631A patent/JPH03203690A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60230891A (en) * | 1984-05-01 | 1985-11-16 | Ricoh Co Ltd | Optical information-recording medium |
| JPS6230088A (en) * | 1985-08-01 | 1987-02-09 | Olympus Optical Co Ltd | Optical memory medium |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5506357A (en) * | 1983-01-12 | 1996-04-09 | Tdk Corporation | Cyanine dyes for use in optical recording medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3026358B2 (en) | Optical recording medium | |
| US5922504A (en) | Optical recording elements having recording layers containing mixtures of no k metallized formazan and cyanine dyes | |
| US5391413A (en) | Optical recording medium | |
| JPH03203692A (en) | Optical recording medium | |
| JP3026357B2 (en) | Optical recording medium | |
| JPH05579A (en) | Optical recording medium | |
| JP3026356B2 (en) | Optical recording medium | |
| JPH03203693A (en) | Optical recording medium | |
| EP0837457A1 (en) | Mixtures of low K metallized formazan dyes with symmetrical and unsymmetrical cyanine dyes | |
| JPH06199045A (en) | Photo recording medium | |
| JPH03203690A (en) | Optical recording medium | |
| JP3673963B2 (en) | Optical information recording medium | |
| JPH03203691A (en) | Optical recording medium | |
| JPH06150371A (en) | Production of optical recording medium | |
| JPH11227331A (en) | Photo-information recording medium | |
| US5580631A (en) | Optical recording medium and optical recording method | |
| JPH06150385A (en) | Optical recording medium | |
| JPH0765413A (en) | Information recording medium | |
| JP3088510B2 (en) | Information recording medium | |
| JP3088501B2 (en) | Information recording medium | |
| JPH04259593A (en) | Optical recording medium | |
| JPS61197281A (en) | Optical recording medium | |
| KR0180889B1 (en) | Optical recording medium containing trasparent epoxy resin | |
| JPH06143821A (en) | Optical recording medium | |
| JP3713619B2 (en) | Optical information recording medium |