JPH0445897B2 - - Google Patents
Info
- Publication number
- JPH0445897B2 JPH0445897B2 JP59008836A JP883684A JPH0445897B2 JP H0445897 B2 JPH0445897 B2 JP H0445897B2 JP 59008836 A JP59008836 A JP 59008836A JP 883684 A JP883684 A JP 883684A JP H0445897 B2 JPH0445897 B2 JP H0445897B2
- Authority
- JP
- Japan
- Prior art keywords
- undercoat layer
- layer
- recording
- recording medium
- undercoat
- 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.)
- Expired - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 description 4
- 229920002120 photoresistant polymer Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- YKYIFUROKBDHCY-ONEGZZNKSA-N (e)-4-ethoxy-1,1,1-trifluorobut-3-en-2-one Chemical group CCO\C=C\C(=O)C(F)(F)F YKYIFUROKBDHCY-ONEGZZNKSA-N 0.000 description 1
- FRASJONUBLZVQX-UHFFFAOYSA-N 1,4-naphthoquinone Chemical compound C1=CC=C2C(=O)C=CC(=O)C2=C1 FRASJONUBLZVQX-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229930192627 Naphthoquinone Natural products 0.000 description 1
- 229910001370 Se alloy Inorganic materials 0.000 description 1
- 229910001215 Te alloy Inorganic materials 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 125000002490 anilino group Chemical group [H]N(*)C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 239000005345 chemically strengthened glass Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007737 ion beam deposition Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002791 naphthoquinones Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 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 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
Description
【発明の詳細な説明】
本発明は、光学的に情報を記録・再生する光学
記録媒体に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical recording medium for optically recording and reproducing information.
従来、この種の光学記録媒体としては、ガラス
或いはPMMA、ポリカーボネイト、エポキシ等
のプラスチツク基板の上に案内溝を形成するため
第一、第二の下塗り層を設け、その上に記録層が
設けられている。記録層としては、フタロシアニ
ン、スクアリリウム、ナフトキノン等の色素や、
Te−Se等のTe合金や、Te−Ｃ、Teを含むプラ
ズマ重合膜等のTeを含む混合物が用いられてい
る。 Conventionally, for this type of optical recording medium, first and second undercoat layers are provided on a plastic substrate such as glass or PMMA, polycarbonate, or epoxy to form a guide groove, and a recording layer is provided on top of the first and second undercoat layers. ing. As a recording layer, dyes such as phthalocyanine, squarylium, naphthoquinone, etc.
Te alloys such as Te-Se and Te-containing mixtures such as Te-C and plasma polymerized films containing Te are used.
このような構成の媒体を多数作製し、記録・再
生を行なつた場合、読み出し信号が小さい媒体が
現われるという問題があつた。 When a large number of media with such a configuration are manufactured and recorded/reproduced, there is a problem in that some media have small read signals.
本発明の目的はこのような問題のない光学記録
媒体を提供することにある。 An object of the present invention is to provide an optical recording medium free from such problems.
すなわち本発明は、透明性基板と記録層との間
の第一の下塗り層と第二の下塗り層とがあり、前
記第二の下塗り層には案内溝が設けられている光
学記録媒体において、記録領域における前記第一
の下塗り層と前記記録層との間隔がλ／2nの整数倍
（λは読み出し光の波長、ｎは第二の下塗り層の
屈折率）であることを特徴とする。 That is, the present invention provides an optical recording medium that includes a first undercoat layer and a second undercoat layer between a transparent substrate and a recording layer, and a guide groove is provided in the second undercoat layer. It is characterized in that the distance between the first undercoat layer and the recording layer in the recording area is an integral multiple of λ/2n (λ is the wavelength of the readout light, and n is the refractive index of the second undercoat layer).
以下、図を用いて詳細に説明する。 Hereinafter, this will be explained in detail using figures.
第１図は光学記録媒体の断面図であり、透明性
基板１の上に第一の下塗り層２、第二の下塗り層
３を介して記録層４が配置され、記録・読み出し
用の光５は基板１の側から入射される。位置精度
よく記録・再生するための案内溝６は第二の下塗
り層３に次のようにして形成される。即ち、あら
かじめ溝が形成されたスタンパー（図示せず）に
第二の下塗り層材料を塗布し、一方基板１には第
一の下塗り層材料を塗布し、各々を第一の下塗り
材料と第二の下塗り材料との面で接着した後、第
二の下塗り層とスタンパーとを剥離させることに
より形成される。この上に形成される記録層４
は、溝形状にそつて付着し得る方法、即ち蒸着、
スパツタ、イオンビームデポジシヨン、イオンプ
レーテイング等の真空成膜法により形成されるこ
とが好適である。記録層への情報の記録は、光の
入射側からみて凸部６ａに行なわれるか或いは凹
部６ｂに行なわれる。 FIG. 1 is a sectional view of an optical recording medium, in which a recording layer 4 is arranged on a transparent substrate 1 via a first undercoat layer 2 and a second undercoat layer 3, and a recording/reading light 5 is provided. is incident from the substrate 1 side. Guide grooves 6 for recording and reproducing with high positional accuracy are formed in the second undercoat layer 3 in the following manner. That is, a pre-grooved stamper (not shown) is coated with a second subbing layer material, while the substrate 1 is coated with a first subbing layer material, and the first subbing material and the second subbing layer material are respectively coated. It is formed by adhering the second undercoat layer to the stamper and then peeling off the second undercoat layer and the stamper. Recording layer 4 formed on this
can be deposited along the groove shape, i.e. vapor deposition,
It is preferable to form the film by a vacuum film forming method such as sputtering, ion beam deposition, or ion plating. Information is recorded on the recording layer either in the convex portions 6a or in the concave portions 6b when viewed from the light incident side.
本発明者らは、このような構成の光学記録媒体
を多数作製し記録・再生を行なつたところ、読み
出し信号の大きさがばらつくという問題を経験し
た。そこでこの問題を追求したところ、次のよう
な原因であることがわかつた。 The inventors of the present invention produced a large number of optical recording media having such a configuration and performed recording/reproduction, and experienced the problem that the magnitude of the read signal varied. When we investigated this problem, we found that the cause was as follows.
第２図は屈折率1.5の基板の上に屈折率1.5の第
一の下塗り層を設け、その上に屈折率1.7の第二
の下塗り層を設け、その上に複素屈折率2.3−i0.8
の記録層を70nｍ設けた構成の媒体反射率の第二
の下塗り層膜厚依存である。基板から入射する光
の波長は830nｍの場合であり、Ｒは記録層が存
在するところの反射率、R′はピツトが形成され
たところの反射率を示している。λ／4nである122n
ｍの奇数倍（λは光の波長、ｎは第二の下塗り層
の屈折率）ごとに信号（＝Ｒ−R′）が小さくな
ることがわかる。又、λ／2nである244nｍの整数倍
ごとに最大の信号をとることがわかる。 Figure 2 shows a first undercoat layer with a refractive index of 1.5 on a substrate with a refractive index of 1.5, a second undercoat layer with a refractive index of 1.7 on top of that, and a complex refractive index of 2.3-i0.8
The reflectance of a medium with a recording layer of 70 nm depends on the thickness of the second undercoat layer. The wavelength of light incident from the substrate is 830 nm, R indicates the reflectance where the recording layer is present, and R' indicates the reflectance where the pits are formed. It can be seen that the signal (=R-R') decreases for every odd number multiple of 122 nm, which is λ/4n (λ is the wavelength of light, and n is the refractive index of the second undercoat layer). Also, it can be seen that the maximum signal is obtained at every integer multiple of 244 nm, which is λ/2n.
以下、実施例を用いてさらに詳細に説明する。 Hereinafter, it will be explained in more detail using Examples.
実施例 １
スパイラル状の溝が設けられたニツケル製スタ
ンパーの上にフオトレジストAZ1375（商品名、シ
ツプレー製、ｎ＝1.67）を塗布し、一方、厚さ
1.1mm、直径200mmの化学強化されたガラスの上に
アクリル系の紫外線硬化樹脂（ｎ＝1.5）を塗布
した。次にフオトレジストと紫外線硬化樹脂とを
重ねて、ガラス基板側から紫外線を照射して、フ
オトレジストと紫外線硬化樹脂を接着した後、ス
タンパーを剥離した。次に案内溝が形成されたフ
オトレジスト層の上に、５−アミノ−２，３−ジ
シアノ−８−〔（４−エトキシ）アニリノ〕−１，
４−ナフトキノン色素を70nｍの厚さに蒸着し
て、追加書き込み可能光デイスクを作製した。第
二の下塗り層であるフオトレジスト層は第一の下
塗り層と案内溝の凸部との間隔で4970nｍ、
5090nｍ、5220nｍ、5340nｍと４種類のデイスク
を作製した。第一の下塗り層厚は0.1mmとした。
λ＝830nｍの半導体レーザ光を基板側から照射
して、凸部に記録し、再生したところ、λ／2nの整
数倍である4970nｍ、5220nｍのものの出力信号
が最も大きく、良好な特性であつた。Example 1 Photoresist AZ1375 (trade name, manufactured by Shippray, n = 1.67) was applied on a nickel stamper provided with spiral grooves, while the thickness
Acrylic ultraviolet curing resin (n=1.5) was applied onto chemically strengthened glass with a diameter of 1.1 mm and a diameter of 200 mm. Next, the photoresist and the ultraviolet curable resin were stacked, and ultraviolet rays were irradiated from the glass substrate side to bond the photoresist and the ultraviolet curable resin, and then the stamper was peeled off. Next, 5-amino-2,3-dicyano-8-[(4-ethoxy)anilino]-1,
A writable optical disk was fabricated by depositing 4-naphthoquinone dye to a thickness of 70 nm. The photoresist layer, which is the second undercoat layer, has a distance of 4970 nm between the first undercoat layer and the convex portion of the guide groove.
Four types of disks were manufactured: 5090 nm, 5220 nm, and 5340 nm. The thickness of the first undercoat layer was 0.1 mm.
When a semiconductor laser beam of λ=830nm was irradiated from the substrate side to record on the convex portion and then reproduced, the output signals of 4970nm and 5220nm, which are integral multiples of λ/2n, were the largest and had good characteristics. .
実施例 ２
記録層としてTe−Se系合金30nｍ厚のものを実
施例１と同様にして評価した。実施例１と同じ
く、λ／2nの整数倍である4970nｍ、5220nｍのもの
の出力信号が最も大きく、良好な特性であつた。Example 2 A recording layer of a Te-Se alloy having a thickness of 30 nm was evaluated in the same manner as in Example 1. As in Example 1, the output signals of 4970 nm and 5220 nm, which are integral multiples of λ/2n, were the largest and had good characteristics.
以上のように、本発明によれば良好な特性の光
学記録媒体のが得られる。 As described above, according to the present invention, an optical recording medium with good characteristics can be obtained.
第１図は光学記録媒体の断面図、第２図は光学
記録媒体の反射率が記録領域の第二下塗り層厚に
よりどのように変化するかを示す図である。図
中、１は透明性基板、２は第一の下塗り層、３は
第二の下塗り層、４は記録層、５は記録・再生
光、６，６ａ，６ｂは案内溝を示している。
FIG. 1 is a cross-sectional view of an optical recording medium, and FIG. 2 is a diagram showing how the reflectance of the optical recording medium changes depending on the thickness of the second undercoat layer in the recording area. In the figure, 1 is a transparent substrate, 2 is a first undercoat layer, 3 is a second undercoat layer, 4 is a recording layer, 5 is a recording/reproducing light, and 6, 6a, and 6b are guide grooves.
Claims (1)
と第二の下塗り層とがあり、前記第二の下塗り層
には案内溝が設けられている光学記録媒体におい
て、記録領域における前記第一の下塗り層と前記
記録層との間隔がλ／2nの整数倍（λは読み出し光 の波長、ｎは第二の下塗り層の屈折率）であるこ
とを特徴とする光学記録媒体。[Claims] 1. An optical recording medium in which a first undercoat layer and a second undercoat layer are provided between a transparent substrate and a recording layer, and a guide groove is provided in the second undercoat layer. characterized in that the distance between the first undercoat layer and the recording layer in the recording area is an integral multiple of λ/2n (λ is the wavelength of the readout light, n is the refractive index of the second undercoat layer). optical recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59008836A JPS60151849A (en) | 1984-01-20 | 1984-01-20 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59008836A JPS60151849A (en) | 1984-01-20 | 1984-01-20 | Optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60151849A JPS60151849A (en) | 1985-08-09 |
| JPH0445897B2 true JPH0445897B2 (en) | 1992-07-28 |
Family
ID=11703864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59008836A Granted JPS60151849A (en) | 1984-01-20 | 1984-01-20 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60151849A (en) |
-
1984
- 1984-01-20 JP JP59008836A patent/JPS60151849A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60151849A (en) | 1985-08-09 |
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