JPS63237239A - Magneto-optical disk - Google Patents
Magneto-optical diskInfo
- Publication number
- JPS63237239A JPS63237239A JP7072387A JP7072387A JPS63237239A JP S63237239 A JPS63237239 A JP S63237239A JP 7072387 A JP7072387 A JP 7072387A JP 7072387 A JP7072387 A JP 7072387A JP S63237239 A JPS63237239 A JP S63237239A
- Authority
- JP
- Japan
- Prior art keywords
- protective film
- magneto
- 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 35
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 230000005415 magnetization Effects 0.000 claims description 7
- 239000000314 lubricant Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 150000005215 alkyl ethers Chemical class 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 229920002554 vinyl polymer Polymers 0.000 claims description 2
- 239000010408 film Substances 0.000 claims 11
- 239000012788 optical film Substances 0.000 claims 1
- 230000010365 information processing Effects 0.000 abstract description 3
- 238000010030 laminating Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 239000011521 glass Substances 0.000 description 5
- 230000015654 memory Effects 0.000 description 5
- 239000005083 Zinc sulfide Substances 0.000 description 4
- 229910052984 zinc sulfide Inorganic materials 0.000 description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 3
- 229920002432 poly(vinyl methyl ether) polymer Polymers 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical class C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 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
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 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
Abstract
Description
【発明の詳細な説明】
〔概要〕
光磁気ディスクの高速駆動を実現する方法として従来の
磁界印加法に代え、磁気ディスク装置に使用している磁
気ヘッドを用いると共に、ヘッドクラッシュによる障害
を防ぐために耐ヘッドクラッシュ用保護膜を設けた光磁
気ディスク。[Detailed Description of the Invention] [Summary] As a method for realizing high-speed driving of a magneto-optical disk, a magnetic head used in a magnetic disk device is used instead of the conventional magnetic field application method, and in order to prevent failures due to head crashes. A magneto-optical disk with a protective film to prevent head crashes.
本発明は情報の高速処理を可能にした光磁気ディスクに
関する。The present invention relates to a magneto-optical disk that enables high-speed processing of information.
光磁気ディスクはレーザ光を用いて高密度の情報記録を
行うメモリであり、光ディスクと同様に記録容量が大き
く、非接触で記録・再生および消去を行うことができ、
また塵埃の影響を受けにくいなど優れた特徴をもってい
る。A magneto-optical disk is a memory that uses laser light to record high-density information. Like an optical disk, it has a large recording capacity and can record, play, and erase without contact.
It also has excellent features such as being less susceptible to dust.
ここで、光ディスクは記録媒体として低融点金属を用い
、情報の記録と再生を穴（ビット）の有無により行う読
み出し専用メモリ （Ｒｅａｄ ０ｎｌｙ Ｍｅｍｏｒ
ｙ）を目的として開発されているのに対し、光磁気ディ
スクは書き換え可能なメモリ（ＥｒａｓａｂｌｅＭｅｍ
ｏｒｙ）として開発が進められているものである。Here, an optical disk is a read-only memory that uses a low-melting point metal as a recording medium and records and reproduces information depending on the presence or absence of holes (bits).
y), whereas magneto-optical disks are rewritable memories (Erasable Memories).
It is currently being developed as a
光磁気ディスクはプラスチックス或いはガラスからなる
ディスク状の透明基板上に希土類−遷移金属系の非晶質
合金を真空蒸着法やスパッタ法などにより膜形成して垂
直磁化膜からなる記録膜を作り、この上に保護膜を設け
て形成されている。Magneto-optical disks are made by forming a film of an amorphous rare earth-transition metal alloy on a disk-shaped transparent substrate made of plastic or glass by vacuum evaporation or sputtering to create a recording film consisting of a perpendicularly magnetized film. A protective film is provided thereon.
ここで、透明基板としてはポリメチルメタクリレート（
略称ＰＨＭＡ） 、ポリカーボネート（略称ＰＣ）のよ
うな透明樹脂を用いるか、あるいはガラスを用いて形成
されており、前者の場合は型成形により情報の記録位置
を示す案内溝（プリグループ）が同心円状か或いは渦巻
き状に設けられている。Here, polymethyl methacrylate (
It is formed using a transparent resin such as PHMA (abbreviation: PHMA), polycarbonate (abbreviation: PC), or glass, and in the former case, guide grooves (pre-groups) that indicate the recording position of information are molded into concentric circles. Or, it is provided in a spiral shape.
一方、ガラス基板の場合は、この上に紫外線硬化樹脂を
塗布した後、金型を圧着して溝形成を行い、ガラス基板
を通し紫外線を照射して硬化させ、案内溝付きの基板を
作る技術が開発され使用されている。On the other hand, in the case of a glass substrate, after coating an ultraviolet curable resin on the resin, a mold is pressed to form a groove, and the glass substrate is irradiated with ultraviolet rays to harden it, creating a substrate with guide grooves. has been developed and used.
こ−で、樹脂層を通して浸透してくる湿気やモノマによ
る記録膜の劣化を防ぐために案内溝を備えた透明な基板
上に窒化硅素（５ｉＪａ ）や硫化亜鉛（ＺｎＳ）など
の材料を用いて第１の保護膜が形成されている。In order to prevent deterioration of the recording film due to moisture and monomers penetrating through the resin layer, a material such as silicon nitride (5iJa) or zinc sulfide (ZnS) is used on a transparent substrate with guide grooves. 1 protective film is formed.
次に、この上に希土類−遷移金属の合金からなり基板面
に垂直に磁化している記録膜があり、更にこの上に第１
の保護膜と同様な材料を用いて第２の保護膜が形成され
ている。Next, on top of this is a recording film made of a rare earth-transition metal alloy and magnetized perpendicular to the substrate surface, and further on top of this is a first recording film.
A second protective film is formed using the same material as the protective film.
か＼る構造をとる光磁気ディスクよの情報の記録は基板
に対し垂直に磁界を加えている状態で透明な基板を通し
て記録膜に集光したレーザ光を照射し、照射された記録
膜の温度が上昇してキュリ一温度の近傍にまで達し、磁
界の方向に磁化反転するのを利用して行われている。To record information on a magneto-optical disk with such a structure, a laser beam focused on the recording film is irradiated through a transparent substrate while a magnetic field is applied perpendicularly to the substrate, and the temperature of the irradiated recording film is changed. This is done by taking advantage of the fact that the temperature rises to near the Curie temperature and the magnetization reverses in the direction of the magnetic field.
また、情報の消去は記録位置の磁化の方向とは逆の方向
に磁界を加えなからレーザ光を照射して局部的に加熱し
、ちと通りの方向に磁化反転させることにより行われて
いる。Furthermore, information is erased by irradiating a laser beam to locally heat the recording position without applying a magnetic field in the direction opposite to the direction of magnetization of the recording position, thereby reversing the magnetization in the same direction.
このようにして情報の記録と消去とが行われているが、
か＼る方法によると既存の記録情報を消去し、この位置
に別な情報を記録するには情報の消去にディスクを１回
転、磁界を反転させるのに１回転、情報を記録するのに
１回転を必要とし、重ね書き（Ｏｖｅｒ−ｗｒｉｔｅ）
ができないことが問題である。Information is recorded and erased in this way,
According to this method, in order to erase existing recorded information and record new information at this location, the disk must be rotated once to erase the information, once to reverse the magnetic field, and once to record the information. Requires rotation and overwrites
The problem is that it is not possible.
光磁気ディスクは情報処理装置用のメモリとして着目さ
れているが重ね書きができず、そのため高速処理ができ
ないことが問題である。Magneto-optical disks are attracting attention as memory for information processing devices, but the problem is that they cannot be overwritten and therefore cannot perform high-speed processing.
上記の問題はディスク形状をした透明基板上に第１の保
護膜、記録膜、第２の保護膜と層形成して構成され、第
２の保護膜側より垂直に磁界を加えつつ、透明基板側よ
りレーザ光を照射して、被照射部の記録膜の温度を上昇
せしめ、磁化反転を起こさせて情報を記録する光磁気デ
ィスクにおいて、
磁界の印加を磁気ヘッドを用いて行うと共に第２の保護
膜上に耐ヘッドクラッシュ用保護膜を設けてなる光磁気
ディスクにより達成することができる。The above problem is solved by forming layers of a first protective film, a recording film, and a second protective film on a disk-shaped transparent substrate. In a magneto-optical disk in which information is recorded by irradiating a laser beam from the side to raise the temperature of the recording film in the irradiated area and causing magnetization reversal, a magnetic field is applied using a magnetic head and a second This can be achieved by a magneto-optical disk in which a protective film for head crash resistance is provided on the protective film.
光磁気ディスクが磁気ディスクのように重ね書きのでき
ない理由は磁界を印加する電磁石と記録膜との距離が離
れており、そのため大きな磁界が必要なことによる。The reason why magneto-optical disks cannot be overwritten like magnetic disks is that the distance between the electromagnet that applies the magnetic field and the recording film is large, and therefore a large magnetic field is required.
か＼る場合には磁心に巻回されているコイルのインダク
タンスが大きくなり、そのために磁界の高速反転ができ
ないことが原因である。In such a case, the inductance of the coil wound around the magnetic core becomes large, and the reason is that the magnetic field cannot be reversed at high speed.
そこで本発明は磁気ディスクに使用している磁気ヘッド
をそのま＼使用するものである。Therefore, the present invention uses the magnetic head used in the magnetic disk as is.
こ−で、磁気ヘッドの使用に伴う問題点は、■ 垂直磁
化膜の磁化反転が磁気ヘッドで行えるかどうか。The problems associated with the use of a magnetic head are: 1) Whether or not the magnetic head can reverse the magnetization of a perpendicularly magnetized film.
■ ヘッドクラッシュに従来構造の光磁気ディスクが耐
えられるかどうか。■ Whether conventionally structured magneto-optical disks can withstand head crashes.
である。It is.
■の問題に対しては垂直単磁極ヘッドの使用が望ましく
、厳密にはこのヘッドからの磁力線を吸引して垂直成分
を多くするため保磁力が小さく透磁率の大きく且つ透明
な磁性膜を記録膜の下に設けることが望ましいが、発明
者らは磁気ディスク装置に使用されているリングヘッド
を用いてもかなりの垂直成分があり、磁化反転ができる
ことを見出した。To solve the problem (2), it is preferable to use a perpendicular single magnetic pole head.Strictly speaking, in order to attract the magnetic field lines from this head and increase the vertical component, a transparent magnetic film with low coercive force and high magnetic permeability is used as the recording film. However, the inventors have found that even when using a ring head used in a magnetic disk drive, there is a considerable perpendicular component and magnetization reversal is possible.
第３図はリングヘッド構造をもつ磁気ヘッドの側面図で
あって、磁気ヘッドｌはスライダ２とコイル５が巻回さ
れているコア３の二つの部分から形成されており、コア
３の下端には記録ギャップが設けられていて、情報の書
込みに際してはコア３のコイル５に信号電流を通じて磁
気ヘッド１を磁化せしめ、その際に記録ギャップ４を通
る磁束の一部が磁気ディスクの記録層を通過するのを利
用して情報の記録を行い、逆に既に磁化している磁区か
らの磁力線がコイル５を通ることにより発生する起電力
を利用して情報の再生を行うものである。FIG. 3 is a side view of a magnetic head having a ring head structure. The magnetic head l is formed from two parts: a slider 2 and a core 3 around which a coil 5 is wound. is provided with a recording gap, and when writing information, a signal current is passed through the coil 5 of the core 3 to magnetize the magnetic head 1, and at that time, a part of the magnetic flux passing through the recording gap 4 passes through the recording layer of the magnetic disk. In this system, information is recorded by utilizing the magnetic field, and conversely, information is reproduced by using the electromotive force generated when magnetic lines of force from already magnetized magnetic domains pass through the coil 5.
なお、スライダ２の下側にあるテーパ６は磁気ディスク
の高速回転により浮上刃を得るために設けられている。Note that the taper 6 on the lower side of the slider 2 is provided to obtain a flying edge by high-speed rotation of the magnetic disk.
■の問題に対しては従来構造はヘッドクラッシュに対し
ては耐えられない。Regarding the problem (2), the conventional structure cannot withstand head crashes.
そこで、本発明は第１図に示すように従来の第２の保護
膜の上に更に耐ヘッドクラッシュ用保護膜を設けるもの
である。Therefore, the present invention provides a head crash-resistant protective film on top of the conventional second protective film, as shown in FIG.
すなわち、従来の光磁気ディスクは透明な基板８の上に
第１の保護膜９．記録膜１０．第２の保護膜１１と層形
成されているが、本発明はこの上に耐ヘッドクラッシュ
用保護膜１２を形成するものである。That is, the conventional magneto-optical disk has a first protective film 9 on a transparent substrate 8. Recording film 10. Although the second protective film 11 is formed as a layer, the present invention forms a head crash-resistant protective film 12 thereon.
次に、第２図は本発明に係る光磁気ディスクの駆動法を
説明する模式図であって、光磁気ディスク１４はスピン
ドル１５に固定されて高速回転しており、一方、光源１
６からのレーザ光はレンズで径約１μｍに集光させて光
磁気ディスク１４の記録膜を照射する。Next, FIG. 2 is a schematic diagram illustrating a method of driving a magneto-optical disk according to the present invention, in which the magneto-optical disk 14 is fixed to a spindle 15 and rotates at high speed, while the light source 1
The laser beam from 6 is focused by a lens to a diameter of about 1 μm and irradiates the recording film of the magneto-optical disk 14 .
また、照射位置の反対側には０．２μｍ以下の微少距離
を隔てて浮上している磁気ヘッドｌがあり、照射位置に
磁界を印加している。 ゛このように磁気ディスク
に類似した駆動方法をとることにより重ね書きが可能と
なる。Further, on the opposite side of the irradiation position, there is a magnetic head 1 floating at a very small distance of 0.2 μm or less, and applies a magnetic field to the irradiation position. ``In this way, by using a driving method similar to that of a magnetic disk, overwriting becomes possible.
実施例１：
厚さ１．２ｍｍのディスク状ガラス基板上にフォトポリ
マ（アクリル酸エステル）をスピンコード法により約３
０μｍの厚さに塗布し、型形成してプリグループ付きの
基板を作り、この上に第１の保護膜としてＺｎＳを８５
０人の厚さに、記録膜としてＴｂＰｉｃｏを９００人の
厚さに、第２の保護膜としてＺｎＳを８５０人の厚さに
それぞれスパッタ法で形成して通常の光磁気ディスクを
形成した。Example 1: Photopolymer (acrylic acid ester) was coated on a disk-shaped glass substrate with a thickness of 1.2 mm by a spin-coding method.
It was coated to a thickness of 0 μm, molded to make a substrate with pre-groups, and ZnS was coated on top of this as a first protective film at 85 μm.
A normal magneto-optical disk was formed by forming TbPico as a recording film to a thickness of 0.0 mm, a recording film of TbPico to a thickness of 900 mm, and a second protective film of ZnS to a thickness of 850 mm.
次に、三二酸化鉄（γ−Ｆｅｚｅｓ）からなる磁性粉を
エポキシルおよびフェノールで結合した磁性膜をスピン
コード法で第２の保護膜の上に３０００人の厚さに形成
し、１５０℃に加熱して硬化させた後、この上に潤滑剤
として弗化カーボン油（パーフルオロアルキルポリエー
テル）を塗布して含浸させ、本発明に係る光磁気ディス
クを形成した。Next, a magnetic film made of magnetic powder made of iron sesquioxide (γ-Fezes) bonded with epoxy and phenol was formed on the second protective film to a thickness of 3,000 μm using a spin code method, and heated to 150°C. After curing, a fluorinated carbon oil (perfluoroalkyl polyether) was applied as a lubricant and impregnated thereon to form a magneto-optical disk according to the present invention.
次に、この光磁気ディスクを用い、第２図に示すような
装置構成で駆動を行ったところ、情報の重ね書きができ
た。Next, when this magneto-optical disk was driven with an apparatus configuration as shown in FIG. 2, information was overwritten.
また、耐久試験としてか＼る光磁気ディスクを磁気ディ
スク装置に設置し、１８００ｒｐｍの回転数でＣＳＳサ
イクルを６０秒としたＣＳＳ耐久試験（Ｃｏｎｔａｃｔ
５ｔａｒｔ ５ｔｏｐ Ｔｅ５ｔ）を行ったところ１
０’回でも変化は認められなかった。In addition, as a durability test, a magneto-optical disk was installed in a magnetic disk drive, and a CSS durability test (Contact
5tart 5top Te5t) 1
No change was observed even at 0' times.
実施例２：
実施例１と同様にして通常の光磁気ディスクを作り、次
に粒径が０．５μｍのアルミナ粉（α−へ１ｚ（ｈ）と
熱硬化性樹脂（エポキシ樹脂）を溶剤を用いて混練した
塗料を第２の保護膜上にスピンコードして１μｍの厚さ
の塗膜を作り、１５０℃で熱処理して樹脂を硬化させ、
この上に潤滑剤（パーフルオロアルキルポリエーテル）
を塗布して含浸させ本発明に係る光磁気ディスクを形成
した。Example 2: A normal magneto-optical disk was made in the same manner as in Example 1, and then alumina powder (α-1z(h) with a particle size of 0.5 μm and a thermosetting resin (epoxy resin) were mixed with a solvent. Spin code the paint kneaded using the second protective film to form a coating film with a thickness of 1 μm, and heat-treat at 150°C to harden the resin.
Lubricant (perfluoroalkyl polyether) on top of this
was coated and impregnated to form a magneto-optical disk according to the present invention.
この光磁気ディスクについて実施例１と同様な記録・再
生試験とＣＳＳ試験を行ったが、同様に良好な結果を得
ることができた。The same recording/reproducing test and CSS test as in Example 1 were conducted on this magneto-optical disk, and similarly good results were obtained.
実施例３：
実施例１と同様にして通常の光磁気ディスクを作り、次
にこの第２の保護膜の上にポリビニルアルキルエーテル
樹脂としてポリビニルメチルエーテル（ＰＶＭＥ）と熱
硬化性樹脂（フェノール）とを溶剤で混練した塗料をス
ピンコードして１μｍの厚さの塗膜を作り、１５０℃で
熱処理して樹脂を硬化させ、次にイソプロピルアルコー
ルに浸漬してｐｖ肚を除去した。Example 3: A normal magneto-optical disk was made in the same manner as in Example 1, and then polyvinyl methyl ether (PVME) and a thermosetting resin (phenol) were added as a polyvinyl alkyl ether resin onto this second protective film. The paint was kneaded with a solvent and then spin-coded to form a coating film with a thickness of 1 μm, heat treated at 150°C to harden the resin, and then immersed in isopropyl alcohol to remove the PV film.
次に、ＰＶＭＥの除去により生じた微細孔に潤滑剤（パ
ーフルオロアルキルポリエーテル）を含浸させ本発明に
かかる光磁気ディスクを形成した。Next, the micropores created by the removal of PVME were impregnated with a lubricant (perfluoroalkyl polyether) to form a magneto-optical disk according to the present invention.
この光磁気ディスクについて実施例１と同様な記録・再
生試験とＣＳＳ試験を行ったが同様に良好な結果を得る
ことができた。The same recording/reproducing test and CSS test as in Example 1 were conducted on this magneto-optical disk, and similarly good results were obtained.
以上記したように本発明の実施により磁気ディスクと同
様に重ね書きができるようになり、これにより高速な情
報処理が可能となった。As described above, by carrying out the present invention, it has become possible to overwrite data in the same way as with magnetic disks, thereby making it possible to perform high-speed information processing.
第１図は本発明に係る光ディスクの断面模式図、第２図
は本発明に係る駆動法を説明する模式図、第３図は磁気
ヘッドの側面図、
である。
図において、
１は磁気ヘッド、 ４は記録ギャップ、５はコ
イル、 ８は基板、
９は第１の保護膜、 １０は記録膜、１１は第２の
保護膜、FIG. 1 is a schematic cross-sectional view of an optical disk according to the present invention, FIG. 2 is a schematic diagram illustrating a driving method according to the present invention, and FIG. 3 is a side view of a magnetic head. In the figure, 1 is a magnetic head, 4 is a recording gap, 5 is a coil, 8 is a substrate, 9 is a first protective film, 10 is a recording film, 11 is a second protective film,
Claims (4)
記録膜、第２の保護膜と層形成して構成され、第２の保
護膜側より垂直に磁界を加えつつ、透明基板側よりレー
ザ光を照射して、被照射部の記録膜の温度を上昇せしめ
、磁化反転を起こさせて情報を記録する光磁気ディスク
において、磁界の印加を磁気ヘッドを用いて行うと共に
第２の保護膜上に耐ヘッドクラッシュ用保護膜を設けて
なることを特徴とする光磁気ディスク。(1) A first protective film on a disk-shaped transparent substrate,
It is composed of a recording film and a second protective film formed in layers, and a magnetic field is applied perpendicularly from the second protective film side, and a laser beam is irradiated from the transparent substrate side to control the temperature of the recording film in the irradiated area. A magneto-optical disk that records information by causing magnetization reversal and is characterized in that a magnetic field is applied using a magnetic head and a head crash-resistant protective film is provided on the second protective film. magneto-optical disk.
潤滑剤を含浸させてなることを特徴とする特許請求の範
囲第１項記載の光磁気ディスク。(2) The magneto-optical disk according to claim 1, wherein the head crash-resistant protective film is formed by impregnating a magnetic coating film with a lubricant.
を含む熱硬化性樹脂に潤滑剤を含浸させてなることを特
徴とする特許請求の範囲第１項記載の光磁気ディスク。(3) The magneto-optical disk according to claim 1, wherein the head crash-resistant protective film is made of a thermosetting resin containing alumina powder impregnated with a lubricant.
アルキルエーテル樹脂を溶解して除去した熱硬化性樹脂
に潤滑剤を含浸させてなることを特徴とする特許請求の
範囲第１項記載の光磁気ディスク。(4) The magneto-optical film according to claim 1, wherein the head crash-resistant protective film is formed by impregnating a thermosetting resin obtained by dissolving and removing polyvinyl alkyl ether resin with a lubricant. disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7072387A JPS63237239A (en) | 1987-03-25 | 1987-03-25 | Magneto-optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7072387A JPS63237239A (en) | 1987-03-25 | 1987-03-25 | Magneto-optical disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63237239A true JPS63237239A (en) | 1988-10-03 |
Family
ID=13439756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7072387A Pending JPS63237239A (en) | 1987-03-25 | 1987-03-25 | Magneto-optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63237239A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03248351A (en) * | 1990-02-23 | 1991-11-06 | Sharp Corp | Magneto-optical recording medium and magnetic recoding and reproducing device using the same |
| EP0461911A2 (en) * | 1990-06-13 | 1991-12-18 | Sharp Kabushiki Kaisha | Magneto-optical disk and manufacturing methods thereof |
| US5336531A (en) * | 1990-02-06 | 1994-08-09 | Sharp Kabushiki Kaisha | Magneto-optical disk and manufacturing methods thereof |
-
1987
- 1987-03-25 JP JP7072387A patent/JPS63237239A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5336531A (en) * | 1990-02-06 | 1994-08-09 | Sharp Kabushiki Kaisha | Magneto-optical disk and manufacturing methods thereof |
| JPH03248351A (en) * | 1990-02-23 | 1991-11-06 | Sharp Corp | Magneto-optical recording medium and magnetic recoding and reproducing device using the same |
| EP0461911A2 (en) * | 1990-06-13 | 1991-12-18 | Sharp Kabushiki Kaisha | Magneto-optical disk and manufacturing methods thereof |
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