JPH0337841A - Optical disk - Google Patents
Optical diskInfo
- Publication number
- JPH0337841A JPH0337841A JP1173754A JP17375489A JPH0337841A JP H0337841 A JPH0337841 A JP H0337841A JP 1173754 A JP1173754 A JP 1173754A JP 17375489 A JP17375489 A JP 17375489A JP H0337841 A JPH0337841 A JP H0337841A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- magneto
- film
- layer
- reflecting material
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims description 15
- 239000000463 material Substances 0.000 claims abstract description 41
- 150000002736 metal compounds Chemical class 0.000 claims description 7
- 239000010408 film Substances 0.000 abstract description 36
- 239000000758 substrate Substances 0.000 abstract description 23
- 238000000034 method Methods 0.000 abstract description 10
- 239000010409 thin film Substances 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 9
- 230000001681 protective effect Effects 0.000 abstract description 9
- 239000011521 glass Substances 0.000 abstract description 7
- 239000000975 dye Substances 0.000 abstract 2
- 238000010030 laminating Methods 0.000 abstract 1
- 238000002310 reflectometry Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 37
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 238000004544 sputter deposition Methods 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 3
- 238000007738 vacuum evaporation Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000004528 spin coating Methods 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- FOPBMNGISYSNED-UHFFFAOYSA-N [Fe].[Co].[Tb] Chemical compound [Fe].[Co].[Tb] FOPBMNGISYSNED-UHFFFAOYSA-N 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001960 metal nitrate Inorganic materials 0.000 description 1
- 239000005300 metallic glass Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000003852 thin film production method Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000007740 vapor deposition 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、レーザ光の点射により、情報の記録再生を行
う先ディスクに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a destination disk on which information is recorded and reproduced by laser beam irradiation.
［従来技術］
従来、記録媒体層が略均一の厚さで平坦に設けられてい
る光ディスクでは基板上にトラッキング用金属反対材、
平坦化層、記録媒体層２保護層が順次積層されている。[Prior Art] Conventionally, in an optical disk in which a recording medium layer is provided flat with a substantially uniform thickness, a metal counter material for tracking is placed on a substrate,
A flattening layer, a recording medium layer 2 protective layer are sequentially laminated.
そして、そのトラッキングはディスク裁板上に一般に渦
巻状若しくは同心固状に形成された金属性反射材と記録
媒体層とからのレーザ光の反対回折を利用して行われて
いる。The tracking is performed by utilizing opposite diffraction of laser light from the recording medium layer and a metallic reflective material generally formed in a spiral or concentric solid shape on the disc cutting board.
［発明が解決しようとする課題］
しかしながら、前記金属性反射材は従来広く用いられて
いる構付基板上に記録層が作成されている光ディスクの
溝の部分に対応し、単にレーザ光を反射し、トラッキン
グを可能にする働きをしており、記録媒体ｊφを平坦化
した光ディスクの記録容量は従来の構付光ディスクの記
録容量と同じであった。[Problems to be Solved by the Invention] However, the metallic reflective material corresponds to the groove portion of an optical disk in which a recording layer is formed on a structured substrate, which has been widely used in the past, and simply reflects laser light. , which functions to enable tracking, and the recording capacity of an optical disk in which the recording medium jφ is flattened is the same as that of a conventional structured optical disk.
また、従来の溝付裁板を用いた光ディスクにおいて大容
量化のため満と満開の両方に記録する方法では、隣り合
うビットが重なり合い、クロストークが非常に大きくな
るため実用的ではなかった。Furthermore, in order to increase the capacity of an optical disc using a conventional grooved cutting board, the method of recording both full and full bloom was impractical because adjacent bits would overlap and crosstalk would become extremely large.
本発明は、上述した問題点を解決するためになされたも
のであり、トラッキング用反射材に記録・再生が可能な
全屈、金属化合物或いはＨ機色素を用いることにより、
従来よりも記録容量が大きく、記録特性の優れた光ディ
スクを提供することにある。The present invention has been made to solve the above-mentioned problems, and by using a recording/reproducing reflective material, a metal compound, or an H machine dye as a tracking reflective material,
An object of the present invention is to provide an optical disc having a larger recording capacity and superior recording characteristics than conventional ones.
［課題を解決するための手段］
この目的を達成するために本発明の光ディスクでは、記
録媒体が略均一の厚さで平坦に設けられている光ディス
クにおいて、渦巻状若しくは同心円状に形成されたトラ
ッキング用材料に適度な反対率を有すかつレーザ光によ
り情報の記録・再生ができる記録媒体として機能する金
属、金属化合物或いは有機色素薄膜を用いる。[Means for Solving the Problems] In order to achieve this object, the optical disc of the present invention has a tracking medium formed in a spiral or concentric shape in an optical disc in which the recording medium is flat and has a substantially uniform thickness. A thin film of a metal, a metal compound, or an organic dye is used as a recording medium that has an appropriate reversal rate and can record and reproduce information using laser light.
［作用］
上記の構成を有する本発明の光ディスクによれば、トラ
ッキング用反射材は適度な反射率を有するため安定なト
ラッキングが得られるとともに記録媒体として機能する
のでレーザ光をトラッキング用反射材に照射することに
より情報の記録・再生ができ、記録客足が大幅に増加す
る。また、記録媒体層は、略均一の厚さで平坦であるた
め、段差部からの劣化は生じず、優れた記録特性が得ら
れる。[Function] According to the optical disc of the present invention having the above configuration, since the tracking reflective material has an appropriate reflectance, stable tracking can be obtained, and since it functions as a recording medium, the tracking reflective material can be irradiated with laser light. By doing so, information can be recorded and reproduced, and the number of recorded customers will increase significantly. Further, since the recording medium layer has a substantially uniform thickness and is flat, no deterioration occurs from the stepped portion, and excellent recording characteristics can be obtained.
［実施例］
以下、本発明の実施例を図面に基づいて詳細に説明する
。[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.
尚、ここでは光磁気記録媒体が略均一の厚さで平坦な光
磁気ディスクを話にしているが、記録媒体層に穴あけ型
、相変化型及び有機色素系の記録媒体を用いても同様で
ある。Although we are talking here about a magneto-optical disk whose magneto-optical recording medium is flat and has a substantially uniform thickness, the same effect can be obtained using a perforated type, a phase change type, or an organic dye-based recording medium in the recording medium layer. be.
第１図は、本発明の一実施例である光磁気ディスク１０
の要部断面図であり、光磁気ディスク１０は、ディスク
基板１２上（図では下側）に平坦化層１４．光磁気記録
媒体層１６．及び保護膜１８を順次積層したものである
。FIG. 1 shows a magneto-optical disk 10 which is an embodiment of the present invention.
2 is a sectional view of a main part of the magneto-optical disk 10, in which a flattening layer 14 is formed on a disk substrate 12 (lower side in the figure). Magneto-optical recording medium layer 16. and a protective film 18 are sequentially laminated.
ディスク基板１２は、ガラス基板２０にＴｅ。The disk substrate 12 has a glass substrate 20 coated with Te.
Ｏｘ等の金属化合物製反射材２２を渦巻状若しくは同心
円状に固着したもので、例えば第２図に示されているよ
うにして作製される。即ち、先ず第２図の（ａ）に示さ
れているように平坦なガラスＵ板２０を用意し、その−
面に、（ｂ）に示されているように上記反射材２２を構
成する金属膜２４及び５ｉ０２等の中間膜２５をスパッ
タリングや蒸着等の手段で形成する。この中間膜２５は
記録媒体膜２４を保護する為で、必要に応じて設ける。The reflective material 22 made of a metal compound such as Ox is fixed in a spiral or concentric shape, and is manufactured, for example, as shown in FIG. 2. That is, first, as shown in FIG. 2(a), a flat glass U plate 20 is prepared, and the -
As shown in (b), a metal film 24 constituting the reflective material 22 and an intermediate film 25 such as 5i02 are formed on the surface by sputtering, vapor deposition, or the like. This intermediate film 25 is for protecting the recording medium film 24, and is provided as necessary.
更にレジスト２６をその中間膜２５上に塗布する。次に
、レーザ露光法等により、（Ｃ）に示されているように
上記レジスト２６を渦巻状若しくは同心円状に取り除い
た後、エツチングによって（ｄ）に示されているように
金属膜２４を除去することにより、その金属Ｈ２４の一
部が前記反射材２２としてガラスＭ［２０上に残される
。そして、その反射材２２上に残されたレジスト２６を
除去することにより、（ｅ）に示されているディスク基
板１２が作製される。上記反射材２２は、ガラス基板２
０側から照射されるレーザ光を反射して情報を記録すべ
きトラックを規定するものである。Furthermore, a resist 26 is applied onto the intermediate film 25. Next, the resist 26 is removed in a spiral or concentric manner as shown in (C) using a laser exposure method or the like, and then the metal film 24 is removed by etching as shown in (d). As a result, a part of the metal H24 is left on the glass M[20 as the reflective material 22. Then, by removing the resist 26 left on the reflective material 22, the disk substrate 12 shown in (e) is manufactured. The reflective material 22 is a glass substrate 2
This is to define a track on which information is to be recorded by reflecting a laser beam irradiated from the 0 side.
また、上記ディスク基板１２上に設けられる平坦化層１
４は、化学変化から光磁気記録媒体層１６を保護すると
ともに、光磁気記録媒体層１６において反射される反射
光のカー回転角を増大させ、且つ光の干渉により平坦化
層１４の両面で反射する反射光を打ち消す作用を為すも
のであり、ＳｉＯ□ （二酸化硅素）等の化学的に安定
な透明の酸化物にて構成される。かかる平坦化層１４は
、本実施例ではその作製手段により第１膜１４ａ及び第
２膜１４ｂから構成されており、第１ Ｈ１４ａは、回
転塗４１法によりディスク基板１２の反射材２２側を上
向きにして回転させつつ金属アルコキシドや金属硝酸塩
等の金属化合物を供給して塗布し、これを高温ベークを
用いて固化させたものである。これにより、反射材２２
間の隙間が埋められ、第１膜１４ａのディスク基板１２
と反対側の面は、ディスク基板１２の凹凸に拘らず略平
坦となる。また、第２膜１４ｂは、スパッタリング。Further, a flattening layer 1 provided on the disk substrate 12
4 protects the magneto-optical recording medium layer 16 from chemical changes, increases the Kerr rotation angle of the reflected light reflected at the magneto-optical recording medium layer 16, and prevents reflection on both sides of the flattening layer 14 due to light interference. It has the effect of canceling out the reflected light, and is made of a chemically stable transparent oxide such as SiO□ (silicon dioxide). In this embodiment, the flattening layer 14 is composed of a first film 14a and a second film 14b, and the first film 14a is formed by coating the reflective material 22 side of the disk substrate 12 upward by the spin coating method. A metal compound such as a metal alkoxide or a metal nitrate is supplied and applied while rotating, and this is solidified using high temperature baking. As a result, the reflective material 22
The gap between the disk substrates 12 of the first film 14a is filled.
The surface opposite to the disk substrate 12 is substantially flat regardless of the unevenness of the disk substrate 12. Further, the second film 14b is formed by sputtering.
真空蒸着等の物理的薄膜作製俵、或いはＣＶＤ（Ｃｈｅ
ｍｉｃａｌ Ｖａｐｏｒ Ｄｃｐｏｓｌｔｌｏｎ ）法
等の化学的薄膜作製法により、上記第１膜１４ａと同じ
物質をその第１膜１４ａ上に形成したもので、平坦化層
１４が予め定められた所定の厚さとなるように調整され
る。Physical thin film production methods such as vacuum evaporation, or CVD (Che
The same material as the first film 14a is formed on the first film 14a by a chemical thin film manufacturing method such as a chemical vapor deposition method, and the planarization layer 14 is made to have a predetermined thickness. is adjusted to
光磁気記録媒体ＩＷ１６は、希土類と、遷移金属とを主
成分とするアモルファス金属である光磁気材料、例えは
テルビウム鉄コバルト（ＴｂＦｅＣ０）等を用いて、ス
パッタリングや真空蒸着等により０． １μｍ以下の厚
さで上記平坦化層１４上に形成されている。本実施例で
は、平坦化層１４のディスク基板１２と反対側の表面が
略平坦に形成されているところから、この光磁気記録媒
体層１６は、略均一な厚さで平坦に設けられる。The magneto-optical recording medium IW16 is made of a magneto-optical material which is an amorphous metal mainly composed of rare earth elements and transition metals, such as terbium iron cobalt (TbFeC0), and is made by sputtering, vacuum evaporation, etc. It is formed on the planarization layer 14 with a thickness of 1 μm or less. In this embodiment, since the surface of the flattening layer 14 opposite to the disk substrate 12 is formed substantially flat, the magneto-optical recording medium layer 16 is provided flat with a substantially uniform thickness.
保護膜１８は、上記光磁気記録媒体層１６を化学変化か
ら保護し且つカー回転角を増加させる反１・ｌ効果を顕
著とするためのもので、前記平坦化層１４と同様に５ｉ
０２等の化学的に安定な透明の酸化物にて構成される。The protective film 18 is for protecting the magneto-optical recording medium layer 16 from chemical changes and making the anti-1·l effect noticeable, which increases the Kerr rotation angle.
It is made of chemically stable transparent oxide such as 02.
かかる保護膜１８もその作製手段により第１膜第１８ａ
及び第２膜１８ｂから構成されており、第１膜１８ａは
、スパッタリング、真空蒸着等の物理的薄膜作製法、或
いはＣＶＤ法等の化学的薄膜作製法によって作製されて
いる。また、第２膜１８ｂは、回転塗布法によって上記
第１膜１８ａと同じ物質をその第１膜１８ａ上に上乗せ
し、高温ベークを用いて固化させたもので、保護膜１８
が予め定められた所定の厚さとなるように調整される。This protective film 18 also has a first film 18a depending on its manufacturing method.
and a second film 18b, and the first film 18a is manufactured by a physical thin film manufacturing method such as sputtering or vacuum evaporation, or a chemical thin film manufacturing method such as a CVD method. The second film 18b is obtained by applying the same substance as the first film 18a on the first film 18a using a spin coating method and solidifying it using high temperature baking.
is adjusted to have a predetermined thickness.
この膜厚は、例えば１μｍ以下に定められる。This film thickness is set to, for example, 1 μm or less.
尚、前記平坦化層１４の第２膜１４ｂ、光磁気記録媒体
層１６．及び保護膜１８の第１膜１８ａは、真空中から
取り出すことなく連続して作製される。Note that the second film 14b of the planarization layer 14, the magneto-optical recording medium layer 16. The first film 18a of the protective film 18 is continuously manufactured without being taken out of the vacuum.
そして、かかる光磁気ディスク１０は、そのディスク基
板１２を通してレーザ光が光磁気記録媒体層１６に照射
されると、磁気光学効果により光磁気記録媒体層１６に
おける局部磁化方向に関連して反射光のカー回転角が変
化させられ、この反射光のカー回転角に基づいて情報が
読み出される。In this magneto-optical disk 10, when the magneto-optical recording medium layer 16 is irradiated with laser light through the disk substrate 12, the magneto-optic effect causes the reflected light to change in relation to the local magnetization direction in the magneto-optical recording medium layer 16. The Kerr rotation angle is changed, and information is read out based on the Kerr rotation angle of this reflected light.
また、情報の書込みに際しては、レーザ光の照射に基づ
いてキュリー点まで局部加熱し、この局部の冷却時に外
部磁界の方向を所望する方向へ制御することにより磁化
方向に対応した情報を記録する。In addition, when writing information, local heating is performed to the Curie point based on laser beam irradiation, and information corresponding to the magnetization direction is recorded by controlling the direction of the external magnetic field in a desired direction while cooling this local area.
次に、反射材２２の充分強いレーザ光が照射されると照
射部の温度が上昇し、反射材２２のレーザ照射部に反対
率の差が生じ、情報を記録することができる。記録され
た↑１″′ｉ報は反射材２２に照射されたレーザ光の反
射強度が反射材２２に記録されたビットに対応して変化
することを利用して再生される。このとき、光磁気記録
媒体１６からの反射光を差動法によって検出することに
より、反射材における反射光の強度変化はキャンセルさ
れるためカー回転角に応じた信号のみが得られる。Next, when the reflective material 22 is irradiated with a sufficiently strong laser beam, the temperature of the irradiated portion of the reflective material 22 rises, and a difference in the rate of reversal occurs in the laser irradiated portion of the reflective material 22, allowing information to be recorded. The recorded ↑1'''i information is reproduced by utilizing the fact that the reflection intensity of the laser beam irradiated on the reflective material 22 changes in accordance with the bit recorded on the reflective material 22. At this time, the light By detecting the reflected light from the magnetic recording medium 16 using the differential method, changes in the intensity of the reflected light on the reflective material are canceled, so that only a signal corresponding to the Kerr rotation angle can be obtained.
また、反射材２２からの反射光を偏光子を通さずに検出
することにより、光磁気記録媒体層１６の磁化方向によ
る偏光面の回転の影響を受けず、反射材２２の穴に対応
した信号のみが得られる。このように反η・ｊ材２２と
光磁気記録媒体層１６において信号の検出方法が異なり
、互いに影響を受けないため、クロストークの小さい優
れた再生特性が？すられる。Furthermore, by detecting the reflected light from the reflective material 22 without passing through a polarizer, the signal corresponding to the hole in the reflective material 22 is not affected by the rotation of the plane of polarization due to the magnetization direction of the magneto-optical recording medium layer 16. only can be obtained. In this way, the signal detection methods are different between the anti-η·j material 22 and the magneto-optical recording medium layer 16, and they are not influenced by each other, so excellent reproduction characteristics with low crosstalk can be achieved. Being ignored.
ここで、本実施例の光磁気ディスク１０は、光磁気記録
媒体層１６が略均一の厚ささて平坦であるため、安定な
磁気特性を有する均一な垂直磁気異方性が？すられ、そ
の記ｊ、Ａ市区正が大幅に向上する。Here, in the magneto-optical disk 10 of this embodiment, since the magneto-optical recording medium layer 16 has a substantially uniform thickness and is flat, it has uniform perpendicular magnetic anisotropy with stable magnetic properties. As a result, the A city and ward correction will be significantly improved.
また、本実施例の製造方法においては、光磁気記録媒体
層１６．及びその両面に位置する干渉膜１４の第２膜１
４ｂ、保護膜１８の第１膜１８ａが真空中から取り出す
ことなく連続して作製されるため、光磁気記録媒体層１
６の化学変化が良好に防止されるとともに、光磁気ディ
スク１０を能率的に％Ａ遣できる利点がある。Further, in the manufacturing method of this embodiment, the magneto-optical recording medium layer 16. and the second film 1 of the interference film 14 located on both sides thereof.
4b, since the first film 18a of the protective film 18 is manufactured continuously without being taken out from the vacuum, the magneto-optical recording medium layer 1
This has the advantage that the chemical change of 6 is well prevented, and the magneto-optical disk 10 can be used efficiently.
以上、本発明の一実施例を図面に基づいて詳細に説明し
たが、本発明は他の態様で実施することもできる。Although one embodiment of the present invention has been described above in detail based on the drawings, the present invention can also be implemented in other embodiments.
例えば、前記実施例ではディスク基板１２がガラス基板
２０と環１４材２２とから構成されているが、反射材２
２を設ける替わりにガラス基板２０に満を形成したり、
ガラス基板２０の替わりにアクリル樹脂、ポリカーボネ
ート樹脂、ポリオレフィン樹脂等の合成樹脂などを用い
たりすることも可能である。For example, in the embodiment described above, the disk substrate 12 is composed of the glass substrate 20 and the ring 14 material 22, but the reflective material 2
2, instead of forming a layer on the glass substrate 20,
Instead of the glass substrate 20, it is also possible to use synthetic resins such as acrylic resin, polycarbonate resin, and polyolefin resin.
また、前記平坦化層１４．保護膜１８は、その作製手段
によりそれぞれ第１膜１４ａ、１８ａ及び第２膜１４ｂ
、１８ｂとから構成されているが、それぞれ単一の薄膜
作製法により１回で平坦化層１４、保護膜１８を作製す
るようにしても、或いは複数の薄膜作製法により３層以
上に分けて作製するようにしても差支えない。Further, the planarization layer 14. The protective film 18 has first films 14a, 18a and second film 14b, respectively, depending on its manufacturing method.
, 18b, but the flattening layer 14 and the protective film 18 may be formed at once using a single thin film forming method, or they may be divided into three or more layers using multiple thin film forming methods. There is no problem even if it is manufactured.
また、上記平坦化層１４．保護膜１８の材質は必要に応
して適宜変更され得る。Further, the planarization layer 14. The material of the protective film 18 may be changed as necessary.
また、前述した光磁気ディスク１０の製造方法はあくま
でも一例であり、他の種々の製造方法を採用することが
できる。要するに、平坦化層１４の光磁気記録媒体層１
６側の表面に急峻な四凸がなく、光磁気記録媒体層１６
が略均一の厚さで平坦に設けられれば良いのである。Furthermore, the method for manufacturing the magneto-optical disk 10 described above is just an example, and various other manufacturing methods may be employed. In short, the magneto-optical recording medium layer 1 of the flattening layer 14
There are no four steep convexities on the surface of the magneto-optical recording medium layer 16.
It suffices if it is provided flat with a substantially uniform thickness.
また、前記実施例の光磁気ディスク１０はディスク基板
１２側からレーザ光が照射されるようになっているが、
ディスク話板１２と反対側からレーザ光が入射される形
式の光磁気ディスクにも本発明は同様に適用され得る。Further, although the magneto-optical disk 10 of the above embodiment is configured to be irradiated with laser light from the disk substrate 12 side,
The present invention can be similarly applied to a magneto-optical disk in which a laser beam is incident from the side opposite to the disk talking plate 12.
反射材２２は、Ｉｒｌ変化型金属化合物材料だけでなく
穴あけ型の全屈材料、或いはａ機色素を用いてもよい。The reflective material 22 may be made of not only an Irl-variable metal compound material but also a perforated total refraction material or an a-mode dye.
いずれも、反射光量の変化により情報の再生を行うため
、前述した実施例と同様クロストークの少ない優れた記
録・再生が得られる。また、反射材２２に光磁気記録材
料を用いても同等の効果がある。In either case, since information is reproduced by changing the amount of reflected light, excellent recording and reproduction with little crosstalk can be obtained, similar to the embodiments described above. Further, the same effect can be obtained even if a magneto-optical recording material is used for the reflective material 22.
ここでは、略勾−の厚みのみで平坦な記録媒体として光
磁気記録媒体を用いて説明したが、相変化型記録媒体や
有機色素系記録媒体を用いても同等の効果である。Although the magneto-optical recording medium has been described here as a flat recording medium with only a substantially sloped thickness, the same effect can be obtained by using a phase change type recording medium or an organic dye-based recording medium.
［発明の効果］
以上詳述したことから明らかなように、本発明によれば
、トラッキング用反射材に、金属薄膜金属化合物薄膜、
有機色素系記録媒体或いは相変化型記録媒体を用いるこ
とでクロストークの小さな優れた記録特性が得られると
共に記録容量が大幅に増加する。ざらに略均一の厚みで
平坦な記録媒体層が光磁気媒体であれば安定な磁気特性
を有する垂直磁気異方性が得られ、また、相変化型記録
媒体であれば安定な光反射率、光透過率が得られ、その
結果記録特性が大幅に向上すると共に経年変化の少い信
頼性の高い光ディスクが得られる。[Effects of the Invention] As is clear from the detailed description above, according to the present invention, the tracking reflective material includes a metal thin film, a metal compound thin film,
By using an organic dye type recording medium or a phase change type recording medium, excellent recording characteristics with low crosstalk can be obtained, and the recording capacity can be greatly increased. If a magneto-optical medium has a flat recording medium layer with a roughly uniform thickness, perpendicular magnetic anisotropy with stable magnetic properties can be obtained, and if it is a phase change type recording medium, stable optical reflectance, A high light transmittance can be obtained, and as a result, a highly reliable optical disc with significantly improved recording characteristics and little deterioration over time can be obtained.
第１図及び第２図は本発明を具体化した一実施例を示す
もので、第１図は光磁気ディスクの要部断面図、第２図
は光磁気ディスクにおけるディスク話板の作製方法の一
例を説明する説明図である。
図中、１０は光ディスク、１６は光磁気記録媒体、２２
は記録媒体反射材、２０は基板である。1 and 2 show an embodiment embodying the present invention. FIG. 1 is a cross-sectional view of the main part of a magneto-optical disk, and FIG. It is an explanatory diagram explaining an example. In the figure, 10 is an optical disk, 16 is a magneto-optical recording medium, and 22
2 is a recording medium reflective material, and 20 is a substrate.
Claims (1)
光ディスクにおいて、 トラッキング用反射材に金属性記録媒体、金属化合物記
録媒体或いは有機色素記録媒体を用いることを特徴とす
る光ディスク。[Claims] 1. In an optical disc in which the recording medium layer is flat and has a substantially uniform thickness, it is possible to use a metallic recording medium, a metal compound recording medium, or an organic dye recording medium as a tracking reflective material. Characteristic optical disc.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1173754A JP2968541B2 (en) | 1989-07-05 | 1989-07-05 | optical disk |
| US07/432,457 US5089358A (en) | 1988-11-05 | 1989-11-06 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1173754A JP2968541B2 (en) | 1989-07-05 | 1989-07-05 | optical disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0337841A true JPH0337841A (en) | 1991-02-19 |
| JP2968541B2 JP2968541B2 (en) | 1999-10-25 |
Family
ID=15966518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1173754A Expired - Fee Related JP2968541B2 (en) | 1988-11-05 | 1989-07-05 | optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2968541B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61204901A (en) * | 1985-03-08 | 1986-09-11 | 富山県 | Moisture sensing element |
| WO2006022360A1 (en) * | 2004-08-27 | 2006-03-02 | Ricoh Company, Ltd. | Optical-recording medium, method for producing the same, and method for recording and reproducing optical-recording medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6427049A (en) * | 1987-04-22 | 1989-01-30 | Hitachi Ltd | Optical disk, substrate for optical disk and its production |
| JPS6439643A (en) * | 1987-08-05 | 1989-02-09 | Toppan Printing Co Ltd | Optical recording medium |
-
1989
- 1989-07-05 JP JP1173754A patent/JP2968541B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6427049A (en) * | 1987-04-22 | 1989-01-30 | Hitachi Ltd | Optical disk, substrate for optical disk and its production |
| JPS6439643A (en) * | 1987-08-05 | 1989-02-09 | Toppan Printing Co Ltd | Optical recording medium |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61204901A (en) * | 1985-03-08 | 1986-09-11 | 富山県 | Moisture sensing element |
| WO2006022360A1 (en) * | 2004-08-27 | 2006-03-02 | Ricoh Company, Ltd. | Optical-recording medium, method for producing the same, and method for recording and reproducing optical-recording medium |
| KR100834427B1 (en) * | 2004-08-27 | 2008-06-04 | 가부시키가이샤 리코 | Optical-recording medium, method for producing the same, and method for recording and reproducing optical-recording medium |
| US7636289B2 (en) | 2004-08-27 | 2009-12-22 | Ricoh Company, Ltd. | Optical-recording medium, method for producing the same, and method for recording and reproducing optical-recording |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2968541B2 (en) | 1999-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5455818A (en) | Optical recording medium | |
| US5089358A (en) | Optical recording medium | |
| JPH0991755A (en) | Phase transition optical disk | |
| JP2822531B2 (en) | Magneto-optical recording medium and magneto-optical recording / erasing method | |
| JP2722723B2 (en) | Optical recording medium | |
| US5554451A (en) | Optical data recording medium | |
| JPH0337841A (en) | Optical disk | |
| US6620480B1 (en) | Pre-engraved substrate for magnetic, magneto-optical, or phase transition optical disc | |
| JPH09106572A (en) | Optical recording medium | |
| JP2737269B2 (en) | Optical recording medium | |
| JPH0589521A (en) | Optical recording medium | |
| JP2669003B2 (en) | Magneto-optical disk | |
| JPH0328739B2 (en) | ||
| JPH03141050A (en) | Optical recording medium | |
| JPH0562248A (en) | Optical disk medium using two wavelengths | |
| JPH0337838A (en) | Optical disk | |
| JPH0337839A (en) | Large-capacity optical disk | |
| KR100239770B1 (en) | Substrate of magneto-optical disk | |
| JPH01273240A (en) | Optical recording medium | |
| JPH09320115A (en) | Optical disk | |
| JPH0378131A (en) | Optical recording medium | |
| JPH03216837A (en) | Freely rewritable type optical disk | |
| JPH03290842A (en) | Optical recording medium | |
| JPH0337840A (en) | Phase change type optical disk | |
| JPH04238124A (en) | Optical recording medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |