JPH0640161A - Optical recording medium - Google Patents
Optical recording mediumInfo
- Publication number
- JPH0640161A JPH0640161A JP4029922A JP2992292A JPH0640161A JP H0640161 A JPH0640161 A JP H0640161A JP 4029922 A JP4029922 A JP 4029922A JP 2992292 A JP2992292 A JP 2992292A JP H0640161 A JPH0640161 A JP H0640161A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- layer
- optical recording
- recording layer
- recording
- 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、レーザ光により情報を
記録する光情報記録媒体に関し、コンパクトディスクの
規格に準拠した再生が可能な記録媒体に係わる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium for recording information with a laser beam, and more particularly to a recording medium which can be reproduced in conformity with the compact disc standard.
【０００２】[0002]
【従来の技術】記録可能な光情報記録媒体は、極めて広
く普及しているコンパクトディスク（以下ＣＤと呼ぶ）
に準拠して、再生できることが望まれる。そのため多く
の検討がなされているが、その一つとして、特開平２ー
８７３３９号に開示されている技術がある。これらは有
機色素系の記録膜と反射膜を用いて、レーザ光の入射側
に反射する光量が、ＣＤの規格を満足する高い反射率を
得、且つ、データの再生に際しては、ＣＤフォーマット
に準拠する出力信号が得られる記録可能な光情報記録媒
体である。2. Description of the Related Art A recordable optical information recording medium is a very widespread compact disc (hereinafter referred to as a CD).
It is desirable to be able to reproduce in conformity with. Therefore, many studies have been made, and one of them has been disclosed in Japanese Patent Application Laid-Open No. 2-87339. These use an organic dye-based recording film and a reflective film to obtain a high reflectivity in which the amount of light reflected on the incident side of laser light satisfies the CD standard, and when reproducing data, conform to the CD format. It is a recordable optical information recording medium which can obtain an output signal.
【０００３】また、近年、より記録密度の高い光ディス
クの開発が進められており、この記録密度を高めるた
め、光ビームのスポット径をより微小なものにしなけれ
ばならない問題点があった。そのため、従来７８０ｎｍ
を中心とした半導体レーザから、ＳＨＧ素子等を利用し
て、光の波長を短くしたグリーンレーザやブルーレーザ
を用い、これらのレーザを回折限界まで絞り込んで、ビ
ームスポット径を小さくして記録密度を高める方法が進
められている。Further, in recent years, the development of an optical disc having a higher recording density has been advanced, and there has been a problem that the spot diameter of the light beam must be made smaller in order to increase the recording density. Therefore, conventional 780nm
From a semiconductor laser centered on the SHG element to a green laser or a blue laser in which the wavelength of light is shortened by using an SHG element or the like, and these lasers are narrowed down to the diffraction limit to reduce the beam spot diameter to reduce the recording density. Ways to raise it are under way.
【０００４】[0004]
【発明が解決しようとする課題】記録に用いる色素の種
類によっては、反射率は充分高くとれるものの、記録し
た信号のＣＮＲや変調度があまりとれないことがある。
本発明では、より小さな記録スポットを用いることによ
り高密度化をはかる短波長のレーザで記録できる光記録
媒体において、反射率はそのままで、ＣＮＲや変調度が
大きくとれる光記録媒体を提供することにある。Depending on the type of dye used for recording, the reflectance can be sufficiently high, but the CNR or modulation of recorded signals may not be high enough.
The present invention provides an optical recording medium capable of recording with a laser having a short wavelength, which achieves a higher density by using a smaller recording spot, and an optical recording medium having a large CNR and a large degree of modulation while maintaining the reflectance. is there.
【０００５】[0005]
【課題を解決するための手段】そのため本発明では、透
光性を有する基板上に記録層を形成し、該記録層の上に
反射層を形成してなる光記録媒体において、前記記録層
を化１や化２に示すシアニン系有機色素とポリメチルメ
タクリレートの混合物を用いたことを特徴としたもので
ある。Therefore, in the present invention, in an optical recording medium in which a recording layer is formed on a transparent substrate and a reflective layer is formed on the recording layer, the recording layer is formed. It is characterized by using a mixture of the cyanine-based organic dye shown in Chemical formula 1 or Chemical formula 2 and polymethylmethacrylate.
【０００６】[0006]
（実施例１）本発明による一実施例を図１の断面構成図
によって説明する。図において、ポリカーボネートによ
る基板上に、化学式化１に示すシアニン系色素ＮＫ−３
２１２（１，１’，３，３，３’，３’−ヘキサメチル
−２，２’−インドシアニンパークロレート）〔日本感
光色素研究所製〕０．１ｇとポリメチルメタクリレート
０．１ｇを、トリフルオロエタノールとジアセトンアル
コールの混合液３ｍｌに溶解した溶液をスピンコート法
を用いて６０００ｒｐｍでコートし、記録層２を形成す
る。(Embodiment 1) An embodiment according to the present invention will be described with reference to the sectional configuration diagram of FIG. In the figure, a cyanine dye NK-3 shown in Chemical Formula 1 is formed on a substrate made of polycarbonate.
212 (1,1 ′, 3,3,3 ′, 3′-hexamethyl-2,2′-indocyanine perchlorate) [manufactured by Japan Photosensitive Dye Research Institute] 0.1 g and polymethyl methacrylate 0.1 g A recording layer 2 is formed by coating a solution dissolved in 3 ml of a mixed solution of fluoroethanol and diacetone alcohol at 6000 rpm using a spin coating method.
【０００７】この記録層２の表面に、スパッタリング法
でアルミによる反射層３を５００Ａ°成膜する。さらに
スピンコート法によってＵＶ樹脂をコートし、紫外線を
照射して硬化させ、保護層４を形成する。以上の構成に
よる光記録媒体に光ビームスポットを照射すると、図２
で示すように、照射された部分は加熱され、一部色素が
分解され、記録層の色素とポリメチルメタクリレートが
溶解し、これに接して加熱軟化した基板材料であるポリ
カーボネートが相互に作用して、記録層と基板との界面
に変形部が形成され、これが記録ピットとなる。On the surface of the recording layer 2, a reflection layer 3 made of aluminum is formed at 500 A ° by a sputtering method. Further, a UV resin is coated by a spin coating method and irradiated with ultraviolet rays to be cured to form a protective layer 4. When an optical beam spot is radiated onto the optical recording medium having the above structure,
As shown in, the irradiated part is heated, part of the dye is decomposed, the dye in the recording layer and polymethylmethacrylate are dissolved, and the polycarbonate, which is the substrate material which is softened by heating, interacts with it. A deformed portion is formed at the interface between the recording layer and the substrate, and this becomes a recording pit.
【０００８】この記録媒体の記録層の基板側入射反射率
を図３に示す。本実施例では、最大吸収波長が短波長レ
ーザで記録可能な４００ｎｍ台前半となり、記録レーザ
に４８８ｎｍのアルゴンレーザを用いた場合、基板側入
射反射率はＣＤ−ＷＯ，ＣＤ規格の基板側入射鏡面部分
反射率Ｒｏ７０％を十分に満足した値を示した。また、
このディスクに４８８ｎｍのアルゴンレーザにより線速
度０．７ｍ／ｓ，記録パワー６ｍＷで７２０ｋＨｚを記
録しＣＮＲ４８ｄＢを、記録パワー８ｍＷでＥＦＭ信号
を記録し変調度６７．８％を得た。The substrate side incident reflectance of the recording layer of this recording medium is shown in FIG. In the present embodiment, the maximum absorption wavelength is in the first half of the 400 nm range which can be recorded by a short wavelength laser, and when an 488 nm argon laser is used as the recording laser, the substrate side incident reflectance is the CD-WO, CD standard substrate side incident mirror surface. A value sufficiently satisfying the partial reflectance Ro of 70% was shown. Also,
A CNR of 48 dB was recorded on this disk at a linear velocity of 0.7 m / s and a recording power of 6 mW at 720 kHz by an argon laser of 488 nm, and an EFM signal was recorded at a recording power of 8 mW to obtain a modulation of 67.8%.
【０００９】（実施例２）ポリカーボネートによる基板
上に、化学式（化２）に示すシアニン系色素ＳＮＣ−２
（１，１’−ジエチル−３，３，３’，３’−テトラメ
チル−２，２’−インドカルボシアニンアイオダイド）
〔日本感光色素研究所製〕０．１ｇとポリメチルメタク
リレート０．１ｇを、トリフルオロエタノールとジアセ
トンアルコールの混合液３ｍｌに溶解した溶液をスピン
コート法を用いて６０００ｒｐｍでコートし、記録層２
を形成し、実施例１と同様に処理する。この記録媒体の
記録層の基板側入射反射率を図４に示す。本実施例で
は、最大吸収波長が短波長レーザで記録可能な５００ｎ
ｍ台前半となり、記録レーザに６３３ｎｍのＨｅ−Ｎｅ
レーザを用いた場合、基板側入射反射率はＣＤ−ＷＯ，
ＣＤ規格の基板側入射鏡面部分反射率Ｒｏ７０％を十分
に満足した値を示した。Example 2 A cyanine dye SNC-2 represented by the chemical formula (Formula 2) is formed on a substrate made of polycarbonate.
(1,1'-diethyl-3,3,3 ', 3'-tetramethyl-2,2'-indocarbocyanine iodide)
A recording layer 2 was prepared by coating a solution prepared by dissolving 0.1 g of Nihon Sensitive Dye Research Institute and 0.1 g of polymethylmethacrylate in 3 ml of a mixed solution of trifluoroethanol and diacetone alcohol at 6000 rpm using a spin coating method.
And processed in the same manner as in Example 1. The substrate-side incident reflectance of the recording layer of this recording medium is shown in FIG. In this embodiment, the maximum absorption wavelength is 500 n which can be recorded by a short wavelength laser.
In the first half of the m range, 633 nm He-Ne for recording laser
When a laser is used, the substrate side incident reflectance is CD-WO,
A value sufficiently satisfying the CD-side substrate-side incident mirror surface partial reflectance Ro of 70% was shown.
【００１０】[0010]
【発明の効果】本発明によれば、短波長のレーザを用い
た光記録媒体において、よりＣＮＲ，変調度の大きな光
記録媒体を提供することができる。According to the present invention, it is possible to provide an optical recording medium using a laser having a short wavelength and having a higher CNR and a higher degree of modulation.
【図１】本発明の実施例を示す断面構成図。FIG. 1 is a sectional configuration diagram showing an embodiment of the present invention.
【図２】本発明による実施例に記録メカニズムを示す説
明図。FIG. 2 is an explanatory diagram showing a recording mechanism in an embodiment according to the present invention.
【図３】本発明による実施例１の特性を示す図。FIG. 3 is a diagram showing characteristics of Example 1 according to the present invention.
【図４】本発明による実施例２の特性を示す図。FIG. 4 is a graph showing characteristics of Example 2 according to the present invention.
１ 基板 ２ 記録層 ３ 反射層 ４ 保護層 1 substrate 2 recording layer 3 reflective layer 4 protective layer
Claims (2)
し、該記録層の上に反射層を形成してなる光記録媒体に
おいて、前記記録層を化１に示すシアニン系有機色素と
ポリメチルメタクリレートの混合物を用いたことを特徴
とする光記録媒体。 【化１】 1. An optical recording medium in which a recording layer is formed on a transparent substrate and a reflective layer is formed on the recording layer, wherein the recording layer is a cyanine-based organic dye represented by Chemical Formula 1. An optical recording medium comprising a mixture of polymethylmethacrylate. [Chemical 1]
色素とポリメチルメタクリレートの混合物を用いたこと
を特徴とする光記録媒体。 【化２】 2. An optical recording medium characterized by using a mixture of a cyanine organic dye shown in Chemical formula 2 and polymethylmethacrylate in the recording layer. [Chemical 2]
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4029922A JPH0640161A (en) | 1992-01-22 | 1992-01-22 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4029922A JPH0640161A (en) | 1992-01-22 | 1992-01-22 | Optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0640161A true JPH0640161A (en) | 1994-02-15 |
Family
ID=12289488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4029922A Pending JPH0640161A (en) | 1992-01-22 | 1992-01-22 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0640161A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4829155A (en) * | 1985-12-12 | 1989-05-09 | Shiseido Company Ltd. | Hair styler having a heat pipe forming the hair winding portion |
| US4868252A (en) * | 1986-05-27 | 1989-09-19 | Asahi Glass Company Ltd. | Epoxy resin composition |
| US5679430A (en) * | 1995-06-19 | 1997-10-21 | Tdk Corporation | Optical recording medium |
| EP0822544A1 (en) * | 1996-07-29 | 1998-02-04 | Mitsui Toatsu Chemicals, Incorporated | Optical recording medium |
| US5776656A (en) * | 1995-07-28 | 1998-07-07 | Tdk Corporation | Optical recording medium |
| US6162520A (en) * | 1997-09-17 | 2000-12-19 | Mitsui Chemicals, Inc. | Optical recording medium and dipyrromethene metal chelate compound for use therein |
| WO2001044374A1 (en) * | 1999-12-17 | 2001-06-21 | Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo | Cyanine dye |
| EP1262966A2 (en) | 1999-12-28 | 2002-12-04 | Mitsui Chemicals, Inc. | Optical recording medium and novel azaporphyrin compound |
| US6524678B2 (en) | 2000-02-16 | 2003-02-25 | Fuji Photo Film Co., Ltd. | Information recording medium and recording method |
| EP1930339A2 (en) | 2001-10-22 | 2008-06-11 | Mitsui Chemicals, Inc. | Imide compound |
| US7672217B2 (en) | 2002-09-11 | 2010-03-02 | Tdk Corporation | Optical recording medium and optical recording/reproducing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5971895A (en) * | 1982-10-18 | 1984-04-23 | Tdk Corp | Optical recording medium |
| JPS59140099A (en) * | 1983-02-01 | 1984-08-11 | Tdk Corp | Optical recording medium |
| JPS59140098A (en) * | 1983-01-31 | 1984-08-11 | Tdk Corp | Optical recording medium |
| JPH0332885A (en) * | 1989-06-29 | 1991-02-13 | Kuraray Co Ltd | Optical information recording medium |
| JPH0474690A (en) * | 1990-07-17 | 1992-03-10 | Ricoh Co Ltd | Optical information recording medium |
-
1992
- 1992-01-22 JP JP4029922A patent/JPH0640161A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5971895A (en) * | 1982-10-18 | 1984-04-23 | Tdk Corp | Optical recording medium |
| JPS59140098A (en) * | 1983-01-31 | 1984-08-11 | Tdk Corp | Optical recording medium |
| JPS59140099A (en) * | 1983-02-01 | 1984-08-11 | Tdk Corp | Optical recording medium |
| JPH0332885A (en) * | 1989-06-29 | 1991-02-13 | Kuraray Co Ltd | Optical information recording medium |
| JPH0474690A (en) * | 1990-07-17 | 1992-03-10 | Ricoh Co Ltd | Optical information recording medium |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4829155A (en) * | 1985-12-12 | 1989-05-09 | Shiseido Company Ltd. | Hair styler having a heat pipe forming the hair winding portion |
| US4868252A (en) * | 1986-05-27 | 1989-09-19 | Asahi Glass Company Ltd. | Epoxy resin composition |
| US5679430A (en) * | 1995-06-19 | 1997-10-21 | Tdk Corporation | Optical recording medium |
| US5776656A (en) * | 1995-07-28 | 1998-07-07 | Tdk Corporation | Optical recording medium |
| EP0822544A1 (en) * | 1996-07-29 | 1998-02-04 | Mitsui Toatsu Chemicals, Incorporated | Optical recording medium |
| US5948593A (en) * | 1996-07-29 | 1999-09-07 | Mitsui Chemicals, Inc. | Optical recording medium |
| US6060606A (en) * | 1996-07-29 | 2000-05-09 | Mitsui Chemicals, Inc. | Dipyrromethene metal chelate compounds |
| US6355327B1 (en) | 1997-09-17 | 2002-03-12 | Mitsui Chemicals, Inc. | Optical recording medium and dipyrromethene metal chelate compound for use therein |
| US6162520A (en) * | 1997-09-17 | 2000-12-19 | Mitsui Chemicals, Inc. | Optical recording medium and dipyrromethene metal chelate compound for use therein |
| WO2001044374A1 (en) * | 1999-12-17 | 2001-06-21 | Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo | Cyanine dye |
| KR100713710B1 (en) * | 1999-12-17 | 2007-05-07 | (주)하야시바라 생물화학연구소 | Cyanine Dye |
| US7402375B2 (en) * | 1999-12-17 | 2008-07-22 | Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo | Cyanine dyes |
| EP1262966A2 (en) | 1999-12-28 | 2002-12-04 | Mitsui Chemicals, Inc. | Optical recording medium and novel azaporphyrin compound |
| US6524678B2 (en) | 2000-02-16 | 2003-02-25 | Fuji Photo Film Co., Ltd. | Information recording medium and recording method |
| EP1930339A2 (en) | 2001-10-22 | 2008-06-11 | Mitsui Chemicals, Inc. | Imide compound |
| US7672217B2 (en) | 2002-09-11 | 2010-03-02 | Tdk Corporation | Optical recording medium and optical recording/reproducing method |
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