JPH04358331A - Optical information recording medium - Google Patents
Optical information recording mediumInfo
- Publication number
- JPH04358331A JPH04358331A JP3133841A JP13384191A JPH04358331A JP H04358331 A JPH04358331 A JP H04358331A JP 3133841 A JP3133841 A JP 3133841A JP 13384191 A JP13384191 A JP 13384191A JP H04358331 A JPH04358331 A JP H04358331A
- Authority
- JP
- Japan
- Prior art keywords
- groove
- recording
- substrate
- inclination angle
- optical information
- 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
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- 239000010410 layer Substances 0.000 claims abstract description 32
- 239000000758 substrate Substances 0.000 claims abstract description 25
- 239000011241 protective layer Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 230000001678 irradiating effect Effects 0.000 claims description 3
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000004040 coloring Methods 0.000 claims 1
- 238000002310 reflectometry Methods 0.000 abstract description 4
- 239000000975 dye Substances 0.000 description 22
- 238000011156 evaluation Methods 0.000 description 5
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- 239000001007 phthalocyanine dye Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- BCHZICNRHXRCHY-UHFFFAOYSA-N 2h-oxazine Chemical compound N1OC=CC=C1 BCHZICNRHXRCHY-UHFFFAOYSA-N 0.000 description 2
- DZBUGLKDJFMEHC-UHFFFAOYSA-N acridine Chemical compound C1=CC=CC2=CC3=CC=CC=C3N=C21 DZBUGLKDJFMEHC-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000015654 memory Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 2
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 235000000177 Indigofera tinctoria Nutrition 0.000 description 1
- -1 N i Substances 0.000 description 1
- 229930192627 Naphthoquinone Natural products 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000001000 anthraquinone dye Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
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- 239000003822 epoxy resin Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 235000019239 indanthrene blue RS Nutrition 0.000 description 1
- UHOKSCJSTAHBSO-UHFFFAOYSA-N indanthrone blue Chemical compound C1=CC=C2C(=O)C3=CC=C4NC5=C6C(=O)C7=CC=CC=C7C(=O)C6=CC=C5NC4=C3C(=O)C2=C1 UHOKSCJSTAHBSO-UHFFFAOYSA-N 0.000 description 1
- 229940097275 indigo Drugs 0.000 description 1
- COHYTHOBJLSHDF-UHFFFAOYSA-N indigo powder Natural products N1C2=CC=CC=C2C(=O)C1=C1C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-UHFFFAOYSA-N 0.000 description 1
- 239000001013 indophenol dye Substances 0.000 description 1
- DZVCFNFOPIZQKX-LTHRDKTGSA-M merocyanine Chemical compound [Na+].O=C1N(CCCC)C(=O)N(CCCC)C(=O)C1=C\C=C\C=C/1N(CCCS([O-])(=O)=O)C2=CC=CC=C2O\1 DZVCFNFOPIZQKX-LTHRDKTGSA-M 0.000 description 1
- 150000002738 metalloids Chemical group 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- LKKPNUDVOYAOBB-UHFFFAOYSA-N naphthalocyanine Chemical compound N1C(N=C2C3=CC4=CC=CC=C4C=C3C(N=C3C4=CC5=CC=CC=C5C=C4C(=N4)N3)=N2)=C(C=C2C(C=CC=C2)=C2)C2=C1N=C1C2=CC3=CC=CC=C3C=C2C4=N1 LKKPNUDVOYAOBB-UHFFFAOYSA-N 0.000 description 1
- 150000002791 naphthoquinones Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- WVIICGIFSIBFOG-UHFFFAOYSA-N pyrylium Chemical compound C1=CC=[O+]C=C1 WVIICGIFSIBFOG-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000001016 thiazine dye Substances 0.000 description 1
- JOUDBUYBGJYFFP-FOCLMDBBSA-N thioindigo Chemical compound S\1C2=CC=CC=C2C(=O)C/1=C1/C(=O)C2=CC=CC=C2S1 JOUDBUYBGJYFFP-FOCLMDBBSA-N 0.000 description 1
- OKYDCMQQLGECPI-UHFFFAOYSA-N thiopyrylium Chemical compound C1=CC=[S+]C=C1 OKYDCMQQLGECPI-UHFFFAOYSA-N 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 239000001018 xanthene dye Substances 0.000 description 1
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−ザ−光を用いて反
射率を変化させることにより信号を記録する追記型光デ
ィスク(WORM)に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a write-once optical disk (WORM) in which signals are recorded by changing the reflectance using laser light.
【0002】0002
【従来の技術】レ−ザ−ビ−ムを用いる情報記録媒体は
大容量デ−タメモリ−として実用化されている。特に音
楽、画像や各種デ−タ−ベ−スの再生専用メモリ−とし
てROM型光情報記録媒体(コンパクトディスク:CD
)はCD規格に基ずいて再生プレ−ヤとのマッチングも
安定になされ広く一般に普及し使用されている。しかし
ながら、再生専用系のため、利用者が自由に音楽情報等
を記録することは不可能であった。一方、従来の追記型
情報記録媒体ではTe,Sn,Bi等の半金族やシアニ
ン、フタロシアニンン等の有機色素等を記録層として開
発されているが、媒体構造的に記録層背後に空間層を設
けた貼り合わせ構造が一般的には必須であること、また
媒体反射率、記録感度等での媒体特性の多様性から使用
する媒体ごとに設計されたプレ−ヤ(ドライブ)で情報
を記録再生することから民生用途として汎用性に乏しい
欠点があつた。2. Description of the Related Art Information recording media using laser beams have been put to practical use as large-capacity data memories. In particular, ROM-type optical information recording media (compact discs: CDs) are used as memory exclusively for the reproduction of music, images, and various databases.
) is based on the CD standard, has stable matching with playback players, and is widely used. However, since it is a playback-only system, it has been impossible for users to freely record music information and the like. On the other hand, in conventional write-once information recording media, metalloid groups such as Te, Sn, and Bi, and organic dyes such as cyanine and phthalocyanine have been developed as recording layers, but due to the structure of the media, there is a spatial layer behind the recording layer. Since a laminated structure with a Since it is regenerated, it has the drawback of lacking versatility for consumer use.
【0003】0003
【発明が解決しようとする課題】そこで、廉価な市販の
CDプレ−ヤ−を有効に利用しつつ、利用者が自由に情
報を記録しえる追記可能なCDの実用化が強く望まれる
。この追記型CDで最も重要なことは、記録後の信号特
性で再生専用CDプレ−ヤ−との互換が必須なことであ
り、一般に広く普及しているCDプレ−ヤ−で確実に再
生できる必要がある。また、追記時の安定なハ−ド(ラ
イタ−)とのマッチングを保証してやる必要がある。こ
のための媒体設計における詳細仕様は追記型CD規格(
オレンジブック)が既に存在しそれに記載されている。
ここで媒体構造としては板厚1.2mm以内での単板構
造が前提となり、記録前後での安定なフォ−カシングと
トラッキングサ−ボ特性を得るための媒体高反射率(記
録後のグル−ブ反射率(Rtop)で65%以上)、プ
ッシュプル出力ゲイン(P/P)、さらにはラジアルコ
ントラスト出力(グル−ブ上/グル−ブ間反射率差をそ
の反射率で規格化した出力(RCb))を充分安定に獲
得してやる必要がある。さらにCDでのEFM信号の記
録入力に対して形成ピットの低ジッタ−特性、低クロス
ト−ク特性が要求され、さらにCD規格を満足する信号
変調度を獲得してやる必要がある。本発明者らは、CD
規格に適合した追記型光情報記録媒体の提供にあたり、
高反射率と優れたトラッキングサ−ボ特性を確保し、且
つ極めて安定な記録特性(ジッタ−特性、クロスト−ク
特性、記録変調度)を得るために鋭意検討した結果記録
前後における最適基板グル−ブ形状変化を見いだし、か
かる新規な知見にもとづいて本発明をなすに至った。[Problems to be Solved by the Invention] Therefore, it is strongly desired to put into practical use a recordable CD that allows the user to freely record information while making effective use of inexpensive commercially available CD players. The most important thing about this recordable CD is that the signal characteristics after recording must be compatible with playback-only CD players, and it can be reliably played on commonly used CD players. There is a need. Furthermore, it is necessary to ensure stable matching with the hardware (writer) during additional writing. The detailed specifications for media design for this purpose are the write-once CD standard (
Orange Book) already exists and is listed there. Here, the medium structure is assumed to be a single-plate structure with a thickness of 1.2 mm or less, and the medium has a high reflectance (glue after recording) to obtain stable focusing and tracking servo characteristics before and after recording. 65% or more in groove reflectance (Rtop)), push-pull output gain (P/P), and even radial contrast output (output where the reflectance difference on/between grooves is normalized by the reflectance) It is necessary to acquire RCb)) in a sufficiently stable manner. Furthermore, low jitter characteristics and low crosstalk characteristics of formed pits are required for recording and inputting EFM signals on CDs, and it is also necessary to obtain a signal modulation degree that satisfies the CD standard. The inventors have discovered that CD
In providing write-once optical information recording media that comply with the standards,
As a result of intensive studies to ensure high reflectivity and excellent tracking servo characteristics, as well as extremely stable recording characteristics (jitter characteristics, crosstalk characteristics, recording modulation degree), we have determined the optimal substrate group before and after recording. The present invention was made based on this new knowledge.
【0004】0004
【課題を解決するための手段】すなわち、本発明は、ト
ラッキング用グル−ブ半値幅が0.2〜0.6μmの範
囲で且つその半値幅部でのグル−ブ傾斜角度が25゜〜
65゜の範囲にあるグル−ブが形成された基板上に、レ
−ザ−光により情報の書き込みが可能な色素を含有する
記録層が設けられ、さらに該記録層上に金属からなる反
射層及び保護層が設けられてなる単板型光情報記録媒体
である。本発明を添付図面にもとづいて説明すれば、本
発明の光情報記録媒体においては、図1に示すようにト
ラッキング用案内溝が形成されている透明性基板1の上
にレ−ザ−光を吸収する記録層2が形成され、その上に
反射率を増大させるための金属反射層3が設けられてい
る。そしてさらにその上には記録層、反射層を保護する
ための保護層4が形成され、全体としてCD規格を満足
する単板型媒体構造をとる。ここで透明基板上に形成さ
れているグル−ブ仕様としては図2に示すように溝半値
幅(w)が0.2〜0.6μmであり、且つその半値幅
部での溝傾斜角(θ)が25゜〜65゜の範囲にあるよ
うな特定の形状を有するものである。本発明においては
かかる特定の形状を有する単板型光情報記録媒体のグル
−ブ上に成膜された記録膜上への、レ−ザ−光照射によ
り、この記録層が温度上昇し隣接する該基板グル−ブ界
面が熱変形し溝幅方向の形状変化や/又は溝傾斜角の変
化を伴い情報が記録される。[Means for Solving the Problems] That is, the present invention provides a tracking groove whose half-width ranges from 0.2 to 0.6 μm and whose inclination angle at the half-width portion ranges from 25° to 0.6 μm.
A recording layer containing a dye on which information can be written by laser light is provided on a substrate on which grooves in a range of 65° are formed, and a reflective layer made of metal is further provided on the recording layer. and a single-plate optical information recording medium provided with a protective layer. To explain the present invention based on the accompanying drawings, in the optical information recording medium of the present invention, a laser beam is emitted onto a transparent substrate 1 on which a tracking guide groove is formed, as shown in FIG. An absorbing recording layer 2 is formed, on which a metal reflective layer 3 is provided to increase the reflectance. Furthermore, a protective layer 4 for protecting the recording layer and the reflective layer is formed thereon, and the medium as a whole has a single-plate type medium structure that satisfies the CD standard. As shown in FIG. 2, the specifications of the groove formed on the transparent substrate include a groove half width (w) of 0.2 to 0.6 μm, and a groove inclination angle ( θ) is in the range of 25° to 65°. In the present invention, by irradiating the recording film formed on the groove of a single-plate optical information recording medium having such a specific shape with a laser beam, the temperature of this recording layer increases and the temperature of the recording layer increases. The substrate groove interface is thermally deformed and information is recorded as the shape changes in the groove width direction and/or the groove inclination angle changes.
【0005】本発明者らの詳細な検討によれば、未記録
時でのグル−ブ半値幅(w)が0.2〜0.6μm、且
つ傾斜角度(θ)が25゜〜65゜の範囲のグル−ブ仕
様の媒体に於いてはCDの規格で要求される高反射率が
保持でき、ラジアルコントラスト(RCb)が安定に出
力でき、且つP/P出力も充分大きいなど、安定なトラ
ッキングサ−ボ特性が確保しえるのである。ここで溝幅
が0.6μmを越える場合はRCbが減少すると共に記
録時の信号クロスト−クが生じ好ましくない。又溝幅が
0.2μm未満の場合はP/P出力が小さくなり、安定
サ−ボ特性の観点から好ましくない。一方、グル−ブ傾
斜角度は小さい程高反射率が保持しえること、RCb、
P/P信号で外乱要因(例えば記録膜膜厚変動)で信号
が大きく変動しない等の利点はあるが、25゜未満に於
いてはRCbが小さくなると共に記録時のクロスト−ク
が大きくなり好ましくない。また傾斜角度が65゜を越
える場合は記録時に前記のサ−ボ信号が外乱変動を受け
易くジッタ−特性等で劣化が生じ媒体設計としては好ま
しくない。前記したような仕様の基板は、基板の成型時
に用いられるスタンパ−を作る際に、レジストの膜厚、
レジストを露光するレ−ザ−ビ−ムの形状や強度等によ
りスタンパ−のグル−ブ形状をコントロ−ルすることに
よって作ることができる。[0005] According to detailed studies by the present inventors, a groove with a half width (w) of 0.2 to 0.6 μm and an inclination angle (θ) of 25° to 65° when not recorded. For media with a range of groove specifications, the high reflectance required by the CD standard can be maintained, the radial contrast (RCb) can be stably output, and the P/P output is sufficiently large, resulting in stable tracking. Servo characteristics can be ensured. If the groove width exceeds 0.6 .mu.m, RCb decreases and signal crosstalk occurs during recording, which is undesirable. Furthermore, if the groove width is less than 0.2 .mu.m, the P/P output becomes small, which is not preferable from the viewpoint of stable servo characteristics. On the other hand, the smaller the groove inclination angle, the higher the reflectance can be maintained, RCb,
Although there is an advantage that the P/P signal does not vary greatly due to disturbance factors (for example, fluctuations in the recording film thickness), it is preferable that the RCb becomes small and the crosstalk during recording becomes large when the angle is less than 25°. do not have. If the inclination angle exceeds 65°, the servo signal is susceptible to disturbance fluctuations during recording, resulting in deterioration in jitter characteristics, etc., which is not desirable in terms of medium design. For substrates with the specifications described above, when making the stamper used for molding the substrate, the resist film thickness,
It can be produced by controlling the groove shape of the stamper by controlling the shape and intensity of the laser beam used to expose the resist.
【0006】また該グル−ブ上に形成された記録ピット
の詳細な観察と獲得された信号特性(品質)との対応か
ら、図3に示すように記録した際に溝幅方向へのグル−
ブ形状変化が0.05μm以上の場合は再生に必要な記
録変調度が安定に獲得でき、且つ記録後も高反射率が保
持しえる良好なCD互換媒体の達成が可能である。即ち
記録ピット部の溝幅(w’)と未記録部の溝幅(w)に
式[1]がなりたつとき信号変調度獲得が確証しえた。
w’≧ w+0.05 (単位μm)
[1]Furthermore, from the detailed observation of the recording pits formed on the grooves and the correspondence between the obtained signal characteristics (quality), it was found that the grooves in the groove width direction when recording as shown in FIG.
When the change in the shape of the disk is 0.05 μm or more, it is possible to stably obtain the recording modulation degree necessary for reproduction, and it is possible to achieve a good CD compatible medium that can maintain a high reflectance even after recording. That is, when the groove width (w') of the recorded pit portion and the groove width (w) of the unrecorded portion satisfy equation [1], it was confirmed that the degree of signal modulation was obtained. w'≧ w+0.05 (unit: μm)
[1]
【0007】なお、さらにいえば、記録
時の溝幅方向への変化量が0.9μm以下の場合は信号
クロスト−クを低く制御出来、且つジッタ−特性も良好
な記録媒体の確保が安定に可能であり望ましい。すなわ
ち、[2]式の満足も望ましい。
w’≦ 0.9 (単位μm)
[2]ここで溝幅方向への形状変化が0
.05μm未満の場合はEFM変調信号を記録した際、
特に最短ピットである3Tの再生信号の変調度が大きく
ならずCDプレ−ヤ−との互換性が得られない。又信号
変の調度が小さいことからピット端でのジッタ−特性が
劣り良好な再生特性を有しない。一方溝幅方向への変化
量が0.9μmを越える場合は記録ピットの幅が再生ビ
−ム径の実効半径以上(1/e2 )になり信号クロス
ト−クを引き起こし好ましくない。Furthermore, if the amount of change in the groove width direction during recording is 0.9 μm or less, it is possible to control the signal crosstalk to a low level and stably secure a recording medium with good jitter characteristics. possible and desirable. That is, it is also desirable that the expression [2] be satisfied. w'≦0.9 (unit: μm)
[2] Here, the shape change in the groove width direction is 0.
.. If it is less than 0.05μm, when recording the EFM modulation signal,
In particular, the degree of modulation of the reproduction signal of 3T, which is the shortest pit, does not become large, making it difficult to obtain compatibility with CD players. Furthermore, since the degree of signal change is small, the jitter characteristics at the pit end are poor and the reproduction characteristics are not good. On the other hand, if the amount of change in the groove width direction exceeds 0.9 .mu.m, the width of the recording pit becomes larger than the effective radius (1/e2) of the reproducing beam diameter, which is undesirable as it causes signal crosstalk.
【0008】さらに、グル−ブ溝幅変化量と同様、グル
−ブ傾斜角度が±10゜以上の変化を受ける際も充分な
記録変調度が獲得される。即ちここで記録ピット部のグ
ル−ブ傾斜角度(θ’)が未記録部グル−ブ傾斜角度(
θ)に対して下式[3]が成り立つとき信号変調度の獲
得が確認された。図4に概念を示す。
|θ’−θ|≧10゜
[3]ここで、変化が10゜未満の
時には記録変調度の獲得が小さくCD互換足りえない。
記録時において溝幅変化、溝傾斜角度変化は各々独立に
記述したが、当然同時に起こりうる。また上記いずれの
場合でも溝深さ方向への基板変位の有無は特にここだわ
らない。Furthermore, similar to the amount of change in groove width, a sufficient degree of recording modulation can be obtained even when the groove inclination angle changes by ±10° or more. That is, here, the groove inclination angle (θ') of the recorded pit area is equal to the groove inclination angle (θ') of the unrecorded area (
It was confirmed that the signal modulation degree was obtained when the following formula [3] holds for θ). Figure 4 shows the concept. |θ'−θ|≧10゜
[3] Here, when the change is less than 10°, the acquisition of the recording modulation degree is small and CD compatibility is not sufficient. Although groove width changes and groove inclination angle changes are described independently during recording, they can naturally occur at the same time. Further, in any of the above cases, whether or not there is displacement of the substrate in the groove depth direction is not particularly important.
【0009】上記基板1に用いられる材質としては、半
導体レ−ザ−の光を実質的に透過し、通常の光記録媒体
に用いられる高分子材料ならばいかなるものでも使用で
きる。たとえば、ポリカ−ボネ−ト樹脂、アクリル樹脂
、ポリエステル樹脂、エポキシ樹脂、またはアモルファ
スポリオレフィン樹脂などが挙げられる。記録層2に用
いられる色素としては、半導体レ−ザ−の波長域に吸収
を有し、一定以上のエネルギ−をもつレ−ザ−光を吸収
した際に分解・発熱する色素であれば特に限定されない
。ただしCD規格での光学諸要件を鑑みれば屈折率2.
0以上の以下のような各種有機色素を用いることが好ま
しい。即ち、フタロシアニン系色素、ナフタロシアニン
系色素、シアニン系色素、スクアリリウム系色素、ピリ
リウム系色素、チオピリリウム系色素、アズレニウム系
色素、ナフトキノン系色素、アントラキノン系色素、N
i,Crなどの金属塩系色素、インドフェノ−ル系色素
、トリフェニルメタン系色素、キサンテン系色素、イン
ダンスレン系色素、インジゴ系色素、チオインジゴ系色
素、メロシアニン系色素、チアジン系色素、アクリジン
系色素、オキサジン系色素、アゾ系色素などを挙げるこ
とができる。なかでも、耐光性、耐湿熱性の観点からフ
タロシアニン系色素が好ましい。これらの各種色素は一
種類ずつ用いてもよいし、多種類のものを混合、あるい
は積層して用いてもよい。記録層の厚みは、特に規定す
るものではないが、通常30〜1000nm程度である
。As the material used for the substrate 1, any polymeric material that substantially transmits semiconductor laser light and is used in ordinary optical recording media can be used. Examples include polycarbonate resin, acrylic resin, polyester resin, epoxy resin, and amorphous polyolefin resin. The dye used in the recording layer 2 is particularly suitable if it has absorption in the semiconductor laser wavelength range and decomposes and generates heat when it absorbs laser light with energy above a certain level. Not limited. However, considering the optical requirements of the CD standard, the refractive index is 2.
It is preferable to use 0 or more of the following various organic dyes. Namely, phthalocyanine dyes, naphthalocyanine dyes, cyanine dyes, squarylium dyes, pyrylium dyes, thiopyrylium dyes, azulenium dyes, naphthoquinone dyes, anthraquinone dyes, N
i, Cr and other metal salt dyes, indophenol dyes, triphenylmethane dyes, xanthene dyes, indanthrene dyes, indigo dyes, thioindigo dyes, merocyanine dyes, thiazine dyes, acridine Examples include oxazine-based dyes, oxazine-based dyes, and azo-based dyes. Among these, phthalocyanine dyes are preferred from the viewpoint of light resistance and moist heat resistance. These various dyes may be used one by one, or many types may be mixed or stacked. Although the thickness of the recording layer is not particularly limited, it is usually about 30 to 1000 nm.
【0010】金属反射層3材料としては半導体レ−ザ−
の波長域において十分高い反射率を有すもの、即ちAu
,Ag,Cu,Al,Cr,Niなどの金属またはこれ
らを用いた合金が適用される。とりわけAu,Al等の
金属膜はスパッタ法等で高反射率膜が容易に形成される
ので望ましい。その厚みは通常、30〜1000nm程
度である。反射層上には、前述した記録層、反射層を保
護する目的から主として高分子材料からなる保護層4が
設けられる。なかでも紫外線硬化樹脂は容易に保護層が
形成できるので最適である。保護層の厚みは、3〜30
μm 程度である。The material for the metal reflective layer 3 is a semiconductor laser.
Au has a sufficiently high reflectance in the wavelength range of
, Ag, Cu, Al, Cr, Ni, or alloys using these metals. In particular, a metal film such as Au or Al is preferable because a high reflectance film can be easily formed by sputtering or the like. Its thickness is usually about 30 to 1000 nm. A protective layer 4 mainly made of a polymeric material is provided on the reflective layer for the purpose of protecting the recording layer and the reflective layer described above. Among these, ultraviolet curing resins are most suitable because a protective layer can be easily formed thereon. The thickness of the protective layer is 3 to 30
It is about μm.
【0011】[0011]
【実施例】以下、本発明の実施例を示す。
実施例1
α位に4個のビスイソプロピルメトキシ基を有するPd
−テトラ−ビス(イソプロピル)メトキシ−フタロシア
ニンを1分子当り平均3個クロル化したフタロシアニン
色素の3.5重量%ジブチルエ−エル溶液をグル−ブが
設けられた円盤状のポリカ−ボネイト基板(外径:12
0mm,内径:15mm、トラックピッチ:1.6μm
、グル−ブ半値幅:0.52μm、傾斜角度:53゜、
グル−ブ深さ:1250Å)上にスピンコ−ト法(回転
数700rpmの速度で塗布後3000rpmで乾燥)
で溝上/溝間での平均膜厚が1200Å( 120nm
) の前記色素からなる記録層を成膜した。この記録
層の上にAuをスパッタリングして膜厚が800Å(
80nm )の反射層を形成した。更に、この反射層上
に、保護層としてUV硬化性樹脂SD−17(大日本イ
ンキ化学工業(株)製)をスピンコ−ト後、紫外線を照
射し硬化させ厚さ4μmの保護層を形成し情報記録媒体
を作った。
上記で得られた情報記録媒体を、光ディスク評価装置D
DU−1000(パルステック工業製、レ−ザ−波長7
81nm、NA=0.50)を用いて記録前のグル−ブ
上の反射率(Rg)、ラジアルコントラスト(RCb)
、及び0.1μmのオフセットを抱かせたときの2分割
フォトダイオ−ド上でのプッシュプルゲイン値(P/P
)を評価した。結果は表1に纏めた。続いてEFMエン
コ−ダ−(KENWOOD製)を用いて線速度1.4m
/s、記録レ−ザ−パワ−7.0mWでEFM変調信号
を記録した。これをヤマハ製CDX1050CDプレ−
ヤ−にて再生し反射率(Rtop)、BLER(ブロッ
クエラ−レイト)、記録長3T及び11Tの直流再生成
分から記録変調度(I3,I11)、3Tジッタ−値を
測定し表1に纏めた。更に記録後の基板のグル−ブの変
形を走査型トンネル顕微鏡(STM)にて観察したとこ
ろ、記録ピット部の溝幅に0.15μmの変化(拡張)
が観測された。また形成ピットの半値幅部での傾斜角度
は25゜に変化していた。[Examples] Examples of the present invention will be shown below. Example 1 Pd having 4 bisisopropylmethoxy groups at α-position
A 3.5 wt% dibutyl ether solution of a phthalocyanine dye obtained by chlorinating tetra-bis(isopropyl)methoxy-phthalocyanine with an average of three chlorides per molecule was applied to a disc-shaped polycarbonate substrate with grooves (outer diameter :12
0mm, inner diameter: 15mm, track pitch: 1.6μm
, groove half width: 0.52 μm, inclination angle: 53°,
Groove depth: 1250 Å) by spin coating method (coating at a rotation speed of 700 rpm and drying at 3000 rpm)
The average film thickness on the groove/between the grooves is 1200 Å (120 nm).
) A recording layer made of the above dye was formed. Au was sputtered onto this recording layer to a film thickness of 800 Å (
A reflective layer of 80 nm) was formed. Furthermore, a UV curable resin SD-17 (manufactured by Dainippon Ink and Chemicals Co., Ltd.) was spin-coated on this reflective layer as a protective layer, and the resin was cured by irradiation with ultraviolet rays to form a protective layer with a thickness of 4 μm. Created an information recording medium. The information recording medium obtained above is transferred to an optical disc evaluation device D.
DU-1000 (manufactured by Pulstech Industries, laser wavelength 7
Reflectance (Rg) and radial contrast (RCb) on the groove before recording using
, and the push-pull gain value (P/P
) was evaluated. The results are summarized in Table 1. Then, using an EFM encoder (manufactured by KENWOOD), the linear velocity was increased to 1.4 m.
The EFM modulated signal was recorded at a recording laser power of 7.0 mW. This is a Yamaha CDX1050CD player.
The reflectance (Rtop), BLER (block error rate), recording modulation degree (I3, I11), and 3T jitter value were measured from the DC reproduction components of recording lengths of 3T and 11T, and the results are summarized in Table 1. Ta. Furthermore, when we observed the deformation of the groove on the substrate after recording using a scanning tunneling microscope (STM), we found that there was a change (expansion) of 0.15 μm in the groove width of the recording pit.
was observed. Furthermore, the inclination angle at the half-width portion of the formed pit changed to 25°.
【0012】実施例2
実施例1においてグル−ブの半値幅が0.42μm、傾
斜角度が58゜、グル−ブ深さが1250Åの基板を用
いる以外は実施例1と同じようにして情報記録媒体を作
り評価した。結果は表1に纏めた。このときSTM形状
評価によれば、グル−ブ表面幅には0.15μmの変化
が観測された。傾斜角度に変化は観察されなかった。Example 2 Information was recorded in the same manner as in Example 1 except that a substrate with a groove half width of 0.42 μm, an inclination angle of 58°, and a groove depth of 1250 Å was used. The media was created and evaluated. The results are summarized in Table 1. At this time, according to the STM shape evaluation, a change of 0.15 μm in the groove surface width was observed. No change in tilt angle was observed.
【0013】実施例3
実施例1においてグル−ブ半値幅が0.50μm、傾斜
角度が25゜、グル−ブ深さが1150ÅのV溝仕様の
基板を用いる以外は実施例1と同じようにして情報記録
媒体を作り評価した。結果は表1に纏めた。このときS
TM形状評価によれば、グル−ブ半値幅には0.22μ
mの変化が確認された。傾斜角度は33゜に変化してい
た。Example 3 The same procedure as in Example 1 was used except that a V-groove substrate with a groove half width of 0.50 μm, an inclination angle of 25°, and a groove depth of 1150 Å was used. An information recording medium was created and evaluated. The results are summarized in Table 1. At this time S
According to the TM shape evaluation, the half width of the groove is 0.22μ.
A change in m was confirmed. The angle of inclination had changed to 33°.
【0014】比較例1
実施例1においてグル−ブ半値幅が0.72μm、傾斜
角度が22゜、ブル−ブ深さが1250Åの基板を用い
る以外は実施例1と同じようにして情報記録媒体を作り
評価した。結果は表1に纏めた。又STM形状評価によ
ればグル−ブ半値幅には0.15μmの変化が観測され
、傾斜角度は42゜に変化していた。Comparative Example 1 An information recording medium was prepared in the same manner as in Example 1 except that a substrate having a groove half width of 0.72 μm, an inclination angle of 22°, and a groove depth of 1250 Å was used. was created and evaluated. The results are summarized in Table 1. Further, according to the STM shape evaluation, a change of 0.15 μm in the half width of the groove was observed, and a change in the inclination angle of 42°.
【0015】比較例2
実施例1においてグル−ブ半値幅が0.80μm、傾斜
角度が20゜、グル−ブ深さが700Åの基板を用いる
以外は実施例1と同じようにして情報記録媒体を作り評
価した。結果は表1に纏めた。又STM形状評価によれ
ばブル−ブ半値幅は0.25μmの変化が観察され(記
録部溝幅=1.05μm)、傾斜角度は60゜に変化し
ていた。Comparative Example 2 An information recording medium was prepared in the same manner as in Example 1 except that a substrate having a groove half width of 0.80 μm, an inclination angle of 20°, and a groove depth of 700 Å was used. was created and evaluated. The results are summarized in Table 1. According to the STM shape evaluation, a change of 0.25 μm in the half width of the groove was observed (recording portion groove width = 1.05 μm), and a change in the inclination angle of 60°.
【0016】[0016]
【表1】[Table 1]
【0017】[0017]
【発明の効果】以上説明したように、本発明の光情報記
録媒体によればCD規格を満足するところの高反射率、
安定トラッキングサ−ボ特性を記録前後において有し、
EFM信号再生特性においても信号変調度が十分獲得で
き、低ジッタ−特性、低クロスト−ク特性が確証しえた
安定なCDプレ−ヤ互換記録媒体が容易に得られる。Effects of the Invention As explained above, the optical information recording medium of the present invention has a high reflectance that satisfies the CD standard.
Has stable tracking servo characteristics before and after recording,
A sufficient degree of signal modulation can be obtained in the EFM signal reproduction characteristics, and a stable CD player compatible recording medium with guaranteed low jitter characteristics and low crosstalk characteristics can be easily obtained.
【図1】トラック方向に沿って切断した光情報記録媒体
の断面構造を示す断面図。FIG. 1 is a cross-sectional view showing the cross-sectional structure of an optical information recording medium cut along the track direction.
【図2】光情報記録媒体で用いている光記録前の基板グ
ル−ブ仕様を示す断面図。FIG. 2 is a sectional view showing the specifications of a substrate groove used in an optical information recording medium before optical recording.
【図3】記録ピット部の基板の溝幅の変化を基板表面か
らみた概念図。FIG. 3 is a conceptual diagram of changes in the groove width of the substrate in the recording pit portion as seen from the substrate surface.
【図4】記録ピット部の基板の溝傾斜角度の変化の様子
を示す媒体の半径方向断面図。FIG. 4 is a radial cross-sectional view of the medium showing changes in the groove inclination angle of the substrate in the recording pit portion.
1 基板 2 記録層 3 金属反射層 4 保護層 5 グル−ブ半値幅(w) 6 グル−ブ傾斜角度(θ) 7 未記録部グル−ブ半値幅(w) 8 記録部グル−ブ半値幅(w’) 9 未記録トラッキング用グル−ブ 10 記録ピット形成部グル−ブ 1 Board 2 Recording layer 3 Metal reflective layer 4 Protective layer 5 Groove half width (w) 6 Groove inclination angle (θ) 7 Unrecorded part groove half width (w) 8 Recording section groove half width (w’) 9. Unrecorded tracking groove 10 Recording pit formation groove
Claims (5)
2〜0.6μmの範囲で且つその半値幅部でのグル−ブ
傾斜角度が25゜〜65゜の範囲にあるグル−ブが形成
された基板上に、レ−ザ−光により情報の書き込みが可
能な色素を含有する記録層が設けられ、さらに該記録層
上に金属からなる反射層及び保護層が設けられてなる単
板型光情報記録媒体。Claim 1: The half width of the tracking groove is 0.
Information is written using a laser beam on a substrate on which a groove is formed with a groove in the range of 2 to 0.6 μm and a groove inclination angle in the range of 25° to 65° at the half width. 1. A single-plate optical information recording medium, comprising a recording layer containing a dye capable of coloring, and further comprising a reflective layer and a protective layer made of metal on the recording layer.
射により記録を施すことにより、記録ピット形成部の基
板グル−ブ半値幅が0.05μm以上の変化をともなう
請求項1記載の単板型光情報記録媒体。2. Claim 1, wherein recording is performed by irradiating the recording layer on the groove with a laser beam, thereby causing a change in the half width of the substrate groove of the recording pit forming portion by 0.05 μm or more. The single-plate optical information recording medium described above.
射により記録を施すことにより、記録ピット形成部の基
板グル−ブ傾斜角が、プラスまたはマイナス10゜以上
の変化をともなう請求項1記載の単板型光情報記録媒体
。[Claim 3] By performing recording by irradiating the recording layer on the groove with a laser beam, the inclination angle of the substrate groove at the recording pit forming portion is changed by plus or minus 10° or more. The single-plate optical information recording medium according to claim 1.
素を用いる請求項1〜3のいずれかに記載の単板型光情
報記録媒体。4. The single-plate optical information recording medium according to claim 1, wherein a phthalocyanine organic dye is used as the recording layer.
る請求項1〜3のいずれかに記載の単板型光情報記録媒
体。5. The single-plate optical information recording medium according to claim 1, wherein the medium reflectance before recording is 60% or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3133841A JPH04358331A (en) | 1991-06-05 | 1991-06-05 | Optical information recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3133841A JPH04358331A (en) | 1991-06-05 | 1991-06-05 | Optical information recording medium |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000309132A Division JP2001148122A (en) | 2000-10-10 | 2000-10-10 | Optical information recording method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04358331A true JPH04358331A (en) | 1992-12-11 |
Family
ID=15114295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3133841A Pending JPH04358331A (en) | 1991-06-05 | 1991-06-05 | Optical information recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04358331A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5406546A (en) * | 1992-10-05 | 1995-04-11 | Tdk Corporation | Magneto-optical disk |
US5430706A (en) * | 1993-04-16 | 1995-07-04 | Tdk Corporation | Magneto-optical disk having lands and grooves for recording information |
EP0751505A2 (en) * | 1995-06-27 | 1997-01-02 | Kabushiki Kaisha Toshiba | Optical information-recording medium |
WO2001059780A1 (en) * | 2000-02-14 | 2001-08-16 | Taiyo Yuden Co., Ltd. | Optical information recording medium |
US6287660B1 (en) | 1997-04-24 | 2001-09-11 | Matsushita Electric Industrial Co., Ltd. | Optical recording medium and its substrate |
-
1991
- 1991-06-05 JP JP3133841A patent/JPH04358331A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5406546A (en) * | 1992-10-05 | 1995-04-11 | Tdk Corporation | Magneto-optical disk |
US5430706A (en) * | 1993-04-16 | 1995-07-04 | Tdk Corporation | Magneto-optical disk having lands and grooves for recording information |
EP0751505A2 (en) * | 1995-06-27 | 1997-01-02 | Kabushiki Kaisha Toshiba | Optical information-recording medium |
EP0751505A3 (en) * | 1995-06-27 | 1998-07-08 | Kabushiki Kaisha Toshiba | Optical information-recording medium |
US6287660B1 (en) | 1997-04-24 | 2001-09-11 | Matsushita Electric Industrial Co., Ltd. | Optical recording medium and its substrate |
WO2001059780A1 (en) * | 2000-02-14 | 2001-08-16 | Taiyo Yuden Co., Ltd. | Optical information recording medium |
US6792613B2 (en) | 2000-02-14 | 2004-09-14 | Taiyo Yuden Co., Ltd. | Optical information recording medium |
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