JPS6398857A - Magneto-optical disk - Google Patents
Magneto-optical diskInfo
- Publication number
- JPS6398857A JPS6398857A JP24405186A JP24405186A JPS6398857A JP S6398857 A JPS6398857 A JP S6398857A JP 24405186 A JP24405186 A JP 24405186A JP 24405186 A JP24405186 A JP 24405186A JP S6398857 A JPS6398857 A JP S6398857A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- protective film
- optical disk
- film
- disk
- 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
- 230000001681 protective effect Effects 0.000 claims abstract description 28
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims abstract description 7
- 239000000314 lubricant Substances 0.000 claims abstract description 6
- 239000011521 glass Substances 0.000 claims abstract description 5
- 230000001050 lubricating effect Effects 0.000 claims description 5
- 239000010408 film Substances 0.000 claims 6
- 239000010409 thin film Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 6
- 239000003822 epoxy resin Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 229920000647 polyepoxide Polymers 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 239000010410 layer Substances 0.000 abstract 2
- 238000003848 UV Light-Curing Methods 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 238000004528 spin coating Methods 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 abstract 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 230000001678 irradiating effect Effects 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 description 1
- 229910002546 FeCo Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical compound C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 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
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 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
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
Abstract
Description
【発明の詳細な説明】
〔概 要〕
本発明は磁化反転を利用して情報の記録を行う光磁気デ
ィスクにおいて、情報の記録、消去をディスクの一回転
を待たずに行うために、すなわち、いわゆる重ね書きを
行うために、ディスク媒体面に潤滑性のある保護膜を設
け、磁化反転用外部磁石により直接に重ね書きを行うよ
うにしたものである。[Detailed Description of the Invention] [Summary] The present invention is aimed at recording and erasing information without waiting for one rotation of the disk in a magneto-optical disk that records information using magnetization reversal. In order to perform so-called overwriting, a lubricating protective film is provided on the disk medium surface, and overwriting is directly performed using an external magnet for magnetization reversal.
本発明は光磁気ディスクに関する。本発明は、さらに詳
しく述べると、情報の重ね書きが可能な、書替え可能な
光ディスクの１種である光磁気ディスクに関する。The present invention relates to a magneto-optical disk. More specifically, the present invention relates to a magneto-optical disk, which is a type of rewritable optical disk on which information can be overwritten.
光磁気ディスクは、周知のように、希土類７遷移金属ア
モルファス合金に代表されるように、垂直磁化膜である
記録膜にレーザ光を照射し、局所的に膜を加熱すること
で膜の保磁力を減少させ、そして外部からの磁界により
磁化の向きを変えることで、情報の消去、書込みを行う
ものである。As is well known, in magneto-optical disks, the coercive force of the film is increased by irradiating the recording film, which is a perpendicularly magnetized film, with laser light and locally heating the film, as typified by rare earth 7-transition metal amorphous alloys. Information is erased and written by reducing the magnetic field and changing the direction of magnetization using an external magnetic field.
通常、情報の消去の場合は、一方向に外部から磁界をか
け（例えばディスクに対して下向き）レーザ光をＤＣ的
に、すなわち、非パルス状で照射すると、磁化の向きは
外部磁界の方向く下向き）に一様に揃うことになり、消
去状態になる。情報の書込みは、消去時と逆向き（例え
ばディスクに対して上向き）に（ｎ界をかけ、レーザ光
をＯＮ、 ＯＦＦすることで、すなわち、レーザ光をパ
ルス状で照射することにより行う。この場合、レーザ光
ＯＮのときに記録膜が加熱され、その部分の保磁力が下
がり、磁化方向が外部磁界の方向（ディスクに対して上
向き）に揃い、情報が記録されたことになる。そこで、
通常は、始めに情報の消去を行い次に磁界の向きを逆に
し、レーザ光を変調することで記録を行う。そのため、
ディスクの回転待ち時間ができ、情報の書替えを行う場
合最低でも２回転分の時間が必要となり、高速のメモリ
ーとじて使用する場合、問題となる。Normally, when erasing information, an external magnetic field is applied in one direction (for example, downward to the disk) and a laser beam is irradiated in a DC manner, that is, in a non-pulsed manner, and the direction of magnetization follows the direction of the external magnetic field. They will be aligned uniformly (downward) and will be in an erased state. Information is written in the opposite direction (for example, upwards with respect to the disk) to that during erasing by applying an n field and turning the laser beam ON and OFF, that is, by irradiating the laser beam in a pulsed manner. In this case, the recording film is heated when the laser beam is turned on, the coercive force of that part decreases, the magnetization direction aligns with the direction of the external magnetic field (upwards with respect to the disk), and information is recorded.Therefore,
Normally, information is recorded by first erasing the information, then reversing the direction of the magnetic field and modulating the laser beam. Therefore,
There is a waiting time for the disk to rotate, and rewriting information requires at least two rotations of time, which poses a problem when used as a high-speed memory.
従来は、例えば第３図に示されるように複数の光学ヘッ
ドを用いて、ディスクの回転待ち時間を短縮することが
試みられている。すなわち、図示の例では、記録用へソ
ド２１及び消去用ヘッド２２を光磁気ディスク１７の中
心に対して対向するように配置し、ディスク１回転で情
報の記録、消去が行えるようにしである。図中の１１及
び１２は、それぞれ、情報の記録及び消去のための磁界
の反転を行なうための磁石である。しかし、この例でも
、本来の意味での情報の重ね書きが可能でなく、したが
って、情報の重ね書きが可能な光磁気ディスクを提供す
ることが望まれている。Conventionally, attempts have been made to shorten the disk rotation waiting time by using a plurality of optical heads, for example, as shown in FIG. 3. That is, in the illustrated example, the recording head 21 and the erasing head 22 are arranged to face the center of the magneto-optical disk 17, so that information can be recorded and erased in one rotation of the disk. Reference numerals 11 and 12 in the figure are magnets for reversing the magnetic field for recording and erasing information, respectively. However, even in this example, overwriting of information in the original sense is not possible, and therefore it is desired to provide a magneto-optical disk on which information can be overwritten.
なお、情報の重ね書きが可能でないとは、先に形成した
情報のピントが消去時に完全に除去されず、したがって
、新たに情報を書き込んだ時、古いピットと新しいピッ
トが混在し、新しい情報と古い情報とが混ざり合ってし
まう状態を指している。Note that it is not possible to overwrite information because the focus of previously formed information is not completely removed when erasing, and therefore, when new information is written, old pits and new pits are mixed, and the new information is mixed. This refers to a situation where old information is mixed together.
光磁気ディスクでは、情報の記録、消去とも記録膜を加
熱し外部磁界の方向を変えることで行うため、レーザ光
をＤＣ的に照射しながら磁界の変調を行えば、すなわち
、外部磁石による磁界の向きを、ディスクに対して上向
き、下向きに調整すれば、重ね書きは可能になる。しか
し、外部磁界の向きを記録情報信号通常１〜５ＭＨｚで
変えるためには、磁石をディスクに対して接近させる必
要があり、また、磁石として磁気ディスク用のヘッドを
用いる場合、その間隙を０．５μｍ以下にする必要があ
る。この場合、ディスクの回転開始時、停止時に磁石ヘ
ッドはディスクと接することになり、ディスクの破壊が
大きな問題となっている。In magneto-optical disks, information is recorded and erased by heating the recording film and changing the direction of the external magnetic field. Therefore, if the magnetic field is modulated while irradiating the laser beam in a DC manner, it is possible to change the magnetic field by the external magnet. Overwriting is possible by adjusting the orientation upward or downward relative to the disk. However, in order to change the direction of the external magnetic field at a recording information signal frequency of usually 1 to 5 MHz, it is necessary to bring the magnet close to the disk, and when a head for a magnetic disk is used as the magnet, the gap between the two must be 0.5 MHz. It is necessary to make it 5 μm or less. In this case, the magnetic head comes into contact with the disk when the disk starts and stops rotating, and destruction of the disk becomes a major problem.
上記した問題点は、本発明によれば、記録・消去用磁気
ヘッド配置側の最上層に潤滑性をもった保護膜を有する
ことを特徴とする光磁気ディスクによって解決すること
ができる。According to the present invention, the above-mentioned problems can be solved by a magneto-optical disk characterized by having a lubricating protective film on the uppermost layer on the side where the recording/erasing magnetic head is disposed.
本発明の光磁気ディスクにおいて、その最上保護膜は、
例えばエポキシ樹脂などのような有機樹脂から構成し、
該基材樹脂中に潤滑剤を含ませるのが好ましい。適当な
潤滑剤としては、例えば、フッ化カーボン系潤滑剤、例
えばデュポン社製のタライトツクス（商品名）などをあ
げることができる。この保護膜は、下層の成膜後、スピ
ンコード法などの常用の手法をして成膜することができ
る。In the magneto-optical disk of the present invention, the uppermost protective film is
For example, it is made of organic resin such as epoxy resin,
It is preferable to include a lubricant in the base resin. Suitable lubricants include, for example, fluorocarbon-based lubricants such as Talitex (trade name) manufactured by DuPont. This protective film can be formed by a commonly used method such as a spin code method after forming the lower layer.
本発明による光磁気ディスクは、その好ましい一構成例
を示すと、第１図に断面で示される通りである。図中の
１はガラス基板である。基板１上には、プリグループパ
ターン（図示せず）が形成された紫外線硬化樹脂（いわ
ゆるフォトポリマー）やポリメチルメタクリレート、ポ
リカーボネートなどの有機樹脂からなるプリグループパ
ターン層２が配置されている。A preferred example of the structure of the magneto-optical disk according to the present invention is as shown in cross section in FIG. 1 in the figure is a glass substrate. On the substrate 1, a pre-group pattern layer 2 made of an organic resin such as ultraviolet curing resin (so-called photopolymer), polymethyl methacrylate, or polycarbonate, on which a pre-group pattern (not shown) is formed, is arranged.
図中の４は光磁気記録媒体層である。この層は、特性に
すぐれているばかりでなく、スパッタ法や蒸着法による
成膜が可能であり、媒体の大面積化が容易であるので、
希土類−遷移金属アモルファス合金から形成するのが有
利である。しかし、必要に応じて、その他の媒体材料、
例えばＭｎＢ１゜ＭｎＣｕＢ１などの多結晶性材料、ガ
ーネット系単結晶材料などから形成してもよい。4 in the figure is a magneto-optical recording medium layer. This layer not only has excellent properties, but also can be formed by sputtering or vapor deposition, making it easy to increase the area of the medium.
Advantageously, it is formed from a rare earth-transition metal amorphous alloy. However, if necessary, other media materials,
For example, it may be formed from a polycrystalline material such as MnB1°MnCuB1, a garnet-based single crystal material, or the like.
プリグループパターン層２と記録媒体層４の中間には、
層２中の水分やモノマーの作用がら記録媒体層４を守る
ため、屡々下地とも呼ばれる第１保護膜３を介在させる
のが好ましい。第１保護膜３は、例えば、５ｉＯｚ、Ｔ
ｉ０ｚ、ＺｎＳ、 ＡｆＮ、５ｉＪｎなどの材料から形
成することができる。さらに、この第１の保護膜３と同
様の材料からなる第２の保護膜５を、記録媒体層４と最
後に形成されるべき本発明の最上保護膜６との中間に介
在させるのが好ましい。第２保ｉｉ１！ｓは、外気や保
護膜６中の水分、モノマー等の影響から記録媒体層４を
保護するのに有効である。Between the pregroup pattern layer 2 and the recording medium layer 4,
In order to protect the recording medium layer 4 from the effects of moisture and monomers in the layer 2, it is preferable to interpose a first protective film 3, which is often referred to as an underlayer. The first protective film 3 is made of, for example, 5iOz, T
It can be formed from materials such as i0z, ZnS, AfN, and 5iJn. Furthermore, it is preferable to interpose a second protective film 5 made of the same material as this first protective film 3 between the recording medium layer 4 and the uppermost protective film 6 of the present invention to be formed last. . Second protection ii1! s is effective in protecting the recording medium layer 4 from the influence of the outside air, moisture in the protective film 6, monomer, etc.
本発明による光磁気ディスクは、例えば第２図に略示さ
れるようなディスク装置を用いて情報の重ね書きをする
ことができる。図中の７は光磁気ディスクであり、これ
にレーザ光８をＤＣ的に照射しながら磁気ヘッド９の磁
界を変調する。The magneto-optical disk according to the present invention allows information to be overwritten using a disk device such as that schematically shown in FIG. 2, for example. 7 in the figure is a magneto-optical disk, and the magnetic field of a magnetic head 9 is modulated while irradiating this with a laser beam 8 in a DC manner.
外部磁石（磁気ヘッド）を配置する側の光＋ａ気ディス
ク表面に潤滑性を有する保護膜を設けることにより、外
部磁石を用いて磁界変調による重ね書きが可能となる。By providing a lubricating protective film on the surface of the optical disk on the side where an external magnet (magnetic head) is placed, overwriting by magnetic field modulation becomes possible using the external magnet.
本例では、第１図に断面で示されるような構成の光磁気
ディスクを製作した。In this example, a magneto-optical disk having the configuration shown in cross section in FIG. 1 was manufactured.
基板としてのガラス円板１上にフォトポリマーを膜厚３
０μｍでスピンコードした。ここで使用したフォトポリ
マーは、三菱油化ファイン（１１Ｊ製の５Ａ１００２に
増感剤としてのペンゾインインブヂルエーテルを３％の
量で使用してものであった。スピンコードの完了後、波
長３６５ｎｍの紫り）線光（１５００Ｗ）を３０秒間照
射してフォトポリマーを硬化させた。プリグループパタ
ーン層２が形成された。次いで、このプリグループパタ
ーン層２上に、ＺｎＳを膜ｑ ８５ ｎ ｍでスパッタ
成膜することにより第１保護膜３を、Ｔｂ （ＦｅＣｏ
）を膜厚９０ｎｍでスパッタ成膜することにより記録媒
体層４を、同じ＜ ＺｎＳを膜厚８５ｎｍでスパッタ成
膜することにより第２保護膜５を、順次形成させた。最
後に、エポキシ樹脂（油化シェルエポキシ社製のエピコ
ート８２８）にフン化カーボン系潤滑剤（デュポン社製
のクライトツクス）を混合したものをスピンコードし、
ベークすることにより膜厚１００ ｎｍの最上保護膜６
を成膜した。このようにして、図示の光磁気ディスクが
得られた。A photopolymer is applied to a film thickness of 3 on a glass disk 1 as a substrate.
Spin coded at 0 μm. The photopolymer used here was 5A1002 manufactured by Mitsubishi Yuka Fine (11J) using penzoin in butyl ether as a sensitizer in an amount of 3%. The photopolymer was cured by irradiating it with 365 nm purple light (1500 W) for 30 seconds. A pregroup pattern layer 2 was formed. Next, on this pre-group pattern layer 2, a first protective film 3 of Tb (FeCo
) was formed by sputtering to a thickness of 90 nm to form the recording medium layer 4, and the same ZnS was formed by sputtering to a thickness of 85 nm to form the second protective film 5. Finally, a mixture of epoxy resin (Epicoat 828 manufactured by Yuka Shell Epoxy Co., Ltd.) and fluorinated carbon-based lubricant (Krytxx manufactured by DuPont) was spin-coded.
By baking, a top protective film 6 with a thickness of 100 nm is formed.
was deposited. In this way, the illustrated magneto-optical disk was obtained.
得られた光磁気ディスクを使用して、本発明のように磁
界変調を用いて信号を記録した場合と従来のように光変
調で信号を記録した場合のＣＮＲ比を比較した。次の第
１表に示すような結果が得られた。Using the obtained magneto-optical disk, the CNR ratio was compared between a case where a signal was recorded using magnetic field modulation as in the present invention and a case where a signal was recorded using optical modulation as in the conventional case. The results shown in Table 1 below were obtained.
１０−表
本発明例（磁界変調） 従来例（光変調）記録パワー
５ｍＷ ５ｍＷ消去パワー ５
ｍＷ ５ｍＷ外部磁界 ４０００ ｅ
３０００ ｅＣＮ Ｒ比 ５０ｄＢ
５０ｄＢ上記第１表は、本発明のように磁
界変調を用いた場合でも従来の光変調と同等のＣＮ Ｒ
比が得られるということを示している。なお、本発明例
の場合、外部磁石の接近に原因した記録媒体の破損は発
生しなかった。10-Table Invention example (magnetic field modulation) Conventional example (light modulation) Recording power
5mW 5mW erase power 5
mW 5mW external magnetic field 4000 e
3000 eCN R ratio 50dB
50dB Table 1 above shows that even when magnetic field modulation is used as in the present invention, the CN R is equivalent to conventional optical modulation.
This shows that the ratio can be obtained. Note that in the case of the example of the present invention, damage to the recording medium caused by the approach of the external magnet did not occur.
本発明によれば、光磁気ディスク表面に潤滑性のある保
護膜を設けることにより、外部磁石を表面に接近させて
配置できるので、光磁気ディスクの重ね書きが可能とな
る。According to the present invention, by providing a lubricating protective film on the magneto-optical disk surface, an external magnet can be placed close to the surface, thereby making it possible to overwrite the magneto-optical disk.
第１図は本発明による光磁気ディスクの好ましい一例を
示した断面図、
第２図は本発明のディスクを使用した装置の略示図、そ
して
第３図は従来の光磁気ディスクにおける情報の記録及び
消去の原理を示した略示図である。
図中、１はガラス基板、２はプリグループパターン層、
３は第１保護膜、４は記録媒体層、５は第２保３Ｗ膜、
６は最上保護膜、そして７は光磁気ディスクである。FIG. 1 is a sectional view showing a preferred example of a magneto-optical disk according to the present invention, FIG. 2 is a schematic diagram of an apparatus using the disk of the present invention, and FIG. 3 is a conventional magneto-optical disk for recording information. and FIG. 6 is a schematic diagram showing the principle of erasure. In the figure, 1 is a glass substrate, 2 is a pre-group pattern layer,
3 is a first protective film, 4 is a recording medium layer, 5 is a second protective 3W film,
6 is a top protective film, and 7 is a magneto-optical disk.
Claims (1)
もった保護膜を有することを特徴とする光磁気ディスク
。 ２、前記保護膜が潤滑剤を含有する有機樹脂膜である、
特許請求の範囲第１項に記載の光磁気ディスク。 ３、情報の重ね書きが可能である、特許請求の範囲第１
項又は第２項に記載の光磁気ディスク。 ４、プリグループパターンを有するガラス又はプラスチ
ックの基板と、該基板上に順次形成された、第１保護膜
、光磁気媒体、第２保護膜、そして前記保護膜の薄膜と
からなる、特許請求の範囲第１項〜第３項のいずれか１
項に記載の光磁気ディスク。[Claims] 1. A magneto-optical disk characterized by having a lubricating protective film on the uppermost layer on the side where a recording/erasing magnetic head is disposed. 2. The protective film is an organic resin film containing a lubricant;
A magneto-optical disk according to claim 1. 3. Claim 1 in which information can be overwritten
The magneto-optical disk according to item 1 or 2. 4. The claimed invention comprises a glass or plastic substrate having a pregroup pattern, a first protective film, a magneto-optical medium, a second protective film, and a thin film of the protective film, which are sequentially formed on the substrate. Any one of range 1 to 3
Magneto-optical disk as described in Section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24405186A JPS6398857A (en) | 1986-10-16 | 1986-10-16 | Magneto-optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24405186A JPS6398857A (en) | 1986-10-16 | 1986-10-16 | Magneto-optical disk |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7016197A Division JPH09219045A (en) | 1997-03-24 | 1997-03-24 | Disk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6398857A true JPS6398857A (en) | 1988-04-30 |
Family
ID=17112995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24405186A Pending JPS6398857A (en) | 1986-10-16 | 1986-10-16 | Magneto-optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6398857A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6442039A (en) * | 1987-08-07 | 1989-02-14 | Alps Electric Co Ltd | Magneto-optical recording medium |
| JPS6443834A (en) * | 1987-08-10 | 1989-02-16 | Alps Electric Co Ltd | Magneto-optical recording medium |
| US5578355A (en) * | 1992-06-19 | 1996-11-26 | Tdk Corporation | Magneto-optical disk having a microporous protective coating containing a lubricant |
| US5604005A (en) * | 1993-10-19 | 1997-02-18 | Tdk Corporation | Magneto-optical disc |
| US5912061A (en) * | 1995-08-03 | 1999-06-15 | Matsushita Electric Industrial Co., Ltd. | UV-ray setting resin and a method for manufacturing a magneto-optical disk by the use of the UV-ray setting resin |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61183459A (en) * | 1985-02-07 | 1986-08-16 | Hitachi Ltd | Formation of protective film |
-
1986
- 1986-10-16 JP JP24405186A patent/JPS6398857A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61183459A (en) * | 1985-02-07 | 1986-08-16 | Hitachi Ltd | Formation of protective film |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6442039A (en) * | 1987-08-07 | 1989-02-14 | Alps Electric Co Ltd | Magneto-optical recording medium |
| JPS6443834A (en) * | 1987-08-10 | 1989-02-16 | Alps Electric Co Ltd | Magneto-optical recording medium |
| US5578355A (en) * | 1992-06-19 | 1996-11-26 | Tdk Corporation | Magneto-optical disk having a microporous protective coating containing a lubricant |
| US5604005A (en) * | 1993-10-19 | 1997-02-18 | Tdk Corporation | Magneto-optical disc |
| US5912061A (en) * | 1995-08-03 | 1999-06-15 | Matsushita Electric Industrial Co., Ltd. | UV-ray setting resin and a method for manufacturing a magneto-optical disk by the use of the UV-ray setting resin |
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