JP2889523B2 - Magneto-optical disk - Google Patents
Magneto-optical diskInfo
- Publication number
- JP2889523B2 JP2889523B2 JP454096A JP454096A JP2889523B2 JP 2889523 B2 JP2889523 B2 JP 2889523B2 JP 454096 A JP454096 A JP 454096A JP 454096 A JP454096 A JP 454096A JP 2889523 B2 JP2889523 B2 JP 2889523B2
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- optical recording
- recording film
- substrate
- outer peripheral
- 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
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、情報の書換えが可
能な光メモリ素子としての光磁気ディスクに関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk as an information rewritable optical memory device.
【０００２】[0002]
【従来の技術】近年、情報の書換えが可能な光メモリ素
子としての光磁気ディスクの開発が活発に進められてい
る。図５に示すようにこの光磁気ディスクは、基本的に
は透光性の基板１上に光磁気記録膜２を成膜してなり、
光磁気記録膜２上の所望の記録領域にレーザ光等を照射
して昇温させながら、磁気的に記録・消去を行うもので
ある。2. Description of the Related Art In recent years, the development of a magneto-optical disk as an optical memory element capable of rewriting information has been actively promoted. As shown in FIG. 5, this magneto-optical disk is basically formed by forming a magneto-optical recording film 2 on a translucent substrate 1,
A desired recording area on the magneto-optical recording film 2 is magnetically recorded / erased while irradiating a desired area with a laser beam or the like to increase the temperature.
【０００３】ところで、光磁気記録膜２は、一般に希土
類遷移金属非晶質合金からなっているので、空気、水分
等に接することにより容易に劣化するものであるから、
図５の如く、通常、光磁気記録膜２上に樹脂製の保護膜
３を形成し、光磁気記録膜２を保護するようにしてい
る。その場合、光磁気記録膜２の外周縁部２ａが保護膜
３から露出していると、光磁気記録膜２が外周縁部２ａ
から劣化する恐れがある。Since the magneto-optical recording film 2 is generally made of a rare earth transition metal amorphous alloy, it is easily degraded by contact with air, moisture and the like.
As shown in FIG. 5, a protective film 3 made of resin is usually formed on the magneto-optical recording film 2 to protect the magneto-optical recording film 2. In this case, if the outer peripheral edge 2 a of the magneto-optical recording film 2 is exposed from the protective film 3, the magneto-optical recording film 2 becomes
May be deteriorated.
【０００４】そこで従来、光磁気記録膜２の外周線部２
ａを基板１の外周縁部ｌａより内周側に位置させ、保護
膜３により光磁気記録膜２の外周縁部２ａをも被覆する
ようにしている。Therefore, conventionally, the outer peripheral line portion 2 of the magneto-optical recording film 2 is used.
a is located on the inner peripheral side of the outer peripheral edge la of the substrate 1, and the protective film 3 also covers the outer peripheral edge 2 a of the magneto-optical recording film 2.
【０００５】このように、光磁気記録膜２の外周縁部２
ａを保護膜３により被覆する場合、光磁気記緑膜２の成
膜は、図６に示すように基板１の外周部を環状のホルダ
４により支持し、矢印Ａで示す下方から蒸着、スパッタ
リング等により行い、基板１におけるホルダ４で支持さ
れた以外の領域に光磁気記緑膜２を形成するようにして
いる。As described above, the outer peripheral portion 2 of the magneto-optical recording film 2
When a is coated with the protective film 3, the magneto-optical green film 2 is formed by supporting the outer peripheral portion of the substrate 1 with the annular holder 4 as shown in FIG. The magneto-optical recording film 2 is formed in a region other than the region supported by the holder 4 on the substrate 1.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記の
ように光磁気記録膜２を成膜した光磁気ディスクは、ホ
ルダ４による基板１の支持代ｌが４〜５ｍｍ程度は必要
となるため、光磁気記録膜２の外周縁部２ａは、基板１
の外周縁部１ａよりも４〜５ｍｍ程度内周側に位置する
こととなる。したがってこれらの光磁気ディスクでは、
基板１の外周縁部１ａ近傍のかなり広い領域（半径方向
に４〜５ｍｍ程度）に光磁気記録膜２が形成されないた
め、記憶容量を増大させる上で不利になるという問題を
有している。However, the magneto-optical disk on which the magneto-optical recording film 2 is formed as described above requires the holder 1 to support the substrate 1 by about 4 to 5 mm. The outer peripheral edge 2a of the magnetic recording film 2
Is located on the inner peripheral side of the outer peripheral edge portion 1a by about 4 to 5 mm. Therefore, in these magneto-optical disks,
Since the magneto-optical recording film 2 is not formed in a considerably large area (approximately 4 to 5 mm in the radial direction) near the outer peripheral portion 1a of the substrate 1, there is a problem that it is disadvantageous in increasing the storage capacity.
【０００７】[0007]
【課題を解決するための手段】本発明は上記の課題を解
決して、光磁気記録膜を可能な限り基板の外周縁部近く
まで延長して形成し、しかも光磁気記録膜の外周縁部を
保護膜により被覆し、光磁気記録膜の劣化防止と記録容
量の増大とが図られた光磁気ディスクを提供することを
目的としている。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and forms a magneto-optical recording film so as to extend as close as possible to the outer peripheral edge of the substrate. Is covered with a protective film to provide a magneto-optical disk in which the deterioration of the magneto-optical recording film is prevented and the recording capacity is increased.
【０００８】そのため本発明の光磁気ディスクでは、少
なくとも、透光性の基板と、光磁気記録膜と、光磁気記
録膜を保護する保護膜とを備えた光磁気ディスクにおい
て、前記基板は、外周縁近傍に溝が形成されてなり、前
記光磁気記録膜は、前記溝により分断されており、内周
側の光磁気記録膜の外周縁部が前記溝において前記保護
膜により被覆されてなることを特徴としている。また、
少なくとも、透光性の基板と、光磁気記録膜と、光磁気
記録膜を保護する保護膜とを備えた光磁気ディスクにお
いて、前記基板は、外周縁にテーパ状部を有しており、
前記光磁気記録膜は、前記テーパ状部においてその外周
縁部が前記保護膜により被覆されてなることを特徴とし
ている。[0008] Therefore, in the magneto-optical disk of the present invention, low
At least, a transparent substrate, a magneto-optical recording film, and a magneto-optical recording
Magneto-optical disk with a protective film that protects the recording film
The substrate has a groove formed in the vicinity of the outer peripheral edge.
The magneto-optical recording film is divided by the groove,
The outer edge of the magneto-optical recording film on the side is protected by the groove.
It is characterized by being coated with a film . Also,
At least a translucent substrate, a magneto-optical recording film, and a magneto-optical
Magneto-optical disk with a protective film that protects the recording film
The substrate has a tapered portion on the outer peripheral edge,
The magneto-optical recording film has an outer periphery at the tapered portion.
The edge is covered with the protective film.
Have .
【０００９】本発明によれば、記憶容量を増大でき、か
つ光磁気記録膜の表面を全て保護膜にて被覆できるた
め、光磁気記録膜の劣化を防止できる。 According to the present invention, the storage capacity can be increased.
The entire surface of the magneto-optical recording film can be covered with a protective film.
Therefore, deterioration of the magneto-optical recording film can be prevented .
【００１０】[0010]
【発明の実施の形態】本発明の第１の実施の形態を図１
に基づいて説明すれば以下の通りである。FIG. 1 shows a first embodiment of the present invention.
This will be described below.
【００１１】図１（ｃ）に示すように、本実施例に係る
光磁気ディスク１０は、透光性の基板１１と、膜面と垂
直な方向に磁化容易軸を有する光磁気記録膜１２と、光
磁気記録膜１２を覆う樹脂製の保護膜１３とを備えてい
る。基板１１の外周縁部１１ａ近傍には、光磁気記録膜
１２を通過して基板１１に到る断面ほぼＶ字形の環状溝
１４が設けられ、環状溝１４内には保護膜１３を構成す
る樹脂が充填されている。As shown in FIG. 1C, the magneto-optical disk 10 according to the present embodiment has a light-transmitting substrate 11 and a magneto-optical recording film 12 having an easy axis of magnetization in a direction perpendicular to the film surface. And a protective film 13 made of resin which covers the magneto-optical recording film 12. Near the outer peripheral edge 11a of the substrate 11, an annular groove 14 having a substantially V-shaped cross section which passes through the magneto-optical recording film 12 and reaches the substrate 11 is provided. Is filled.
【００１２】以下、光磁気ディスク１０の製造手順を説
明する。Hereinafter, a procedure for manufacturing the magneto-optical disk 10 will be described.
【００１３】まず、図１（ａ）に示すように、ガラス、
ポリカーボネイトあるいはＰＭＭＡ（ポリメタクリル酸
メチル）等の樹脂または金属等からなる透光性の基板１
１の表面全域に蒸着、スパッタリング等により光磁気記
録膜１２を形成する。First, as shown in FIG.
Translucent substrate 1 made of resin or metal such as polycarbonate or PMMA (polymethyl methacrylate)
The magneto-optical recording film 12 is formed on the entire surface of the substrate 1 by vapor deposition, sputtering, or the like.
【００１４】ここで、基板１１の材料として，ポリカー
ボネイト等の外周縁部近傍で複屈折等の影響で再生信号
品質Ｃ／Ｎの低下するものを使用する場合、予め基板１
１を製品サイズより若干大きめに形成しておいて、外周
縁部近傍を裁断して除去するのが好ましい。例えば、直
径１２０ｍｍの基板１１を使用する場合、予め直径１３
０ｍｍ程度に形成しておいて、Ｃ／Ｎの低下する外周縁
部近傍を裁断すれば、基板１１をポリカーボネイト等で
形成する場合でも外周縁部近傍でのＣ／Ｎを確保するこ
とができるようになる。なお、図１（ａ）には中央部に
円形孔を設けた基板１１を示したが、この円形孔は必ず
しも設けなくて良い。Here, as a material of the substrate 11, when a material having a reduced reproduction signal quality C / N due to the influence of birefringence or the like near the outer peripheral portion of polycarbonate or the like is used, the substrate 1 must be prepared in advance.
It is preferable to form 1 slightly larger than the product size and cut and remove the vicinity of the outer peripheral edge. For example, when a substrate 11 having a diameter of 120 mm is used,
If the substrate 11 is formed at about 0 mm and the vicinity of the outer peripheral edge where the C / N is reduced is cut, the C / N near the outer peripheral edge can be secured even when the substrate 11 is formed of polycarbonate or the like. become. Although FIG. 1A shows the substrate 11 having a circular hole at the center, the circular hole is not necessarily provided.
【００１５】光磁気記録膜１２が成膜されれば、続いて
図１（ｂ）に示すように、基板１１の外周縁部近傍の外
周縁部より内側の部位に、光磁気記録膜１２の側から、
光磁気記録膜１２を通過して基板ｌｌに到達する断面ほ
ぼＶ字状の幅の狭い環状溝１４を形成する。例えば、基
板１１の直径が１２０ｍｍの場合、基板１１の外周縁部
ｌｌａと環状溝１４の内周端部との間の半径方向の間隔
ｌ1は、１ｍｍ以内程度となるようにする。After the magneto-optical recording film 12 is formed, as shown in FIG. 1B, a portion of the magneto-optical recording film 12 near the outer peripheral edge of the substrate 11 and inside the outer peripheral edge is formed. From the side
A narrow annular groove 14 having a substantially V-shaped cross section and reaching the substrate 11 through the magneto-optical recording film 12 is formed. For example, when the diameter of the substrate 11 is 120 mm, the radial interval l 1 between the outer peripheral edge lla of the substrate 11 and the inner peripheral end of the annular groove 14 is set to be about 1 mm or less.
【００１６】次に図１（ｃ）の如く、環状溝１４内を含
む光磁気記録膜１２の表面にスピンコーティング、つま
り基板１１を回転させながら樹脂を滴下させるコーティ
ング法等により保護膜１３を塗布し、続いてこの保護膜
１３を硬化させる。保護膜１３の材料としては、熱硬化
型樹脂、紫外線硬化型樹脂等適宜の樹脂を使用でき、加
熱又は紫外線の照射等により硬化が行われる。Next, as shown in FIG. 1C, a protective film 13 is applied to the surface of the magneto-optical recording film 12 including the inside of the annular groove 14 by spin coating, that is, a coating method of dropping a resin while rotating the substrate 11. Then, the protective film 13 is cured. As a material of the protective film 13, an appropriate resin such as a thermosetting resin or an ultraviolet curing resin can be used, and curing is performed by heating or irradiation of ultraviolet rays.
【００１７】上記の手順で製造された光磁気ディスク１
０は、環状溝１４より内周側の光磁気記録膜１２が記録
領域として利用される。そして、この領域の光磁気記録
膜１２の外周縁部ｌ２ａは、環状溝１４内に充填された
保護膜１３により被覆され、外周縁部ｌ２ａからの光磁
気記録膜１２の劣化が防止される。しかも、基板１１の
外周縁部ｌｌａと光磁気記録膜１２の外周縁部１２ａと
の間隔ｌ1は１ｍｍ以下程度と極めて短いので、光磁気
ディスク１０の記憶容量を増加させる上で有利となる。The magneto-optical disk 1 manufactured according to the above procedure
0 indicates that the magneto-optical recording film 12 on the inner peripheral side of the annular groove 14 is used as a recording area. The outer peripheral edge 12a of the magneto-optical recording film 12 in this region is covered with the protective film 13 filled in the annular groove 14, so that the deterioration of the magneto-optical recording film 12 from the outer peripheral edge 12a is prevented. Moreover, the interval l 1 between the outer peripheral edge lla of the substrate 11 and the outer peripheral edge 12a of the magneto-optical recording film 12 is extremely short, about 1 mm or less, which is advantageous in increasing the storage capacity of the magneto-optical disk 10.
【００１８】次に、図２に基づいて第２の実施の形態を
説明する。Next, a second embodiment will be described with reference to FIG.
【００１９】図２（ｃ）に示すように、光磁気ディスク
２０は基板２１を備え、基板２１の外周縁部２１ａにお
ける角部にはテーパ状部２ｌｂが形成されている。基板
２１のテーパ状部２１ｂを除く表面には光磁気記録膜２
２が形成され、テーパ状部２１ｂ及び光磁気記録膜２２
の表面は保護膜２３により被覆されている。As shown in FIG. 2C, the magneto-optical disk 20 has a substrate 21, and a tapered portion 2lb is formed at a corner of an outer peripheral edge 21a of the substrate 21. The magneto-optical recording film 2 is formed on the surface of the substrate 21 excluding the tapered portion 21b.
2, the tapered portion 21b and the magneto-optical recording film 22
Is covered with a protective film 23.
【００２０】以下、光磁気ディスク２０の製造手順を説
明する。The procedure for manufacturing the magneto-optical disk 20 will be described below.
【００２１】まず、図２（ａ）に示すように、基板２１
の表面の全域に蒸着、スパッタリング等により光磁気記
録膜２２を形成する。First, as shown in FIG.
The magneto-optical recording film 22 is formed on the entire surface of the substrate by vapor deposition, sputtering, or the like.
【００２２】続いて、基板２１の外周縁部２ｌａにおけ
る角部を斜めに裁断し、図２（ｂ）に示すように基板２
１の角部にテーパ状部２ｌｂを形成する。この際、基板
２１の角部上の光磁気記録膜２２は除去される。なお、
テーパ状部２１ｂを形成した後の光磁気記緑膜２２の外
周縁部２２ａと基板２１の外周縁部２１ａとの間の間隔
ｌ2は１ｍｍ以下程度とされる。Subsequently, the corner of the outer peripheral edge 2la of the substrate 21 is cut obliquely, and as shown in FIG.
A tapered portion 2lb is formed at the corner of the first. At this time, the magneto-optical recording film 22 on the corner of the substrate 21 is removed. In addition,
Distance l 2 between the outer peripheral edge portion 21a of the outer peripheral edge portion 22a and the substrate 21 of the optical magnetic recording green film 22 after the formation of the tapered portion 21b is the degree 1mm or less.
【００２３】次に、光磁気記録膜２２の表面上と基板２
１のテーパ状部２１ｂ上に、適宜の樹脂を上述のスピン
コーティング等により塗布することにより、保護膜２３
を形成し、硬化させる。この状態で、光磁気記録膜２２
の外周縁部２２ａはテーパ状部２１ｂ上の保護膜２３に
より被覆される。Next, the surface of the magneto-optical recording film 22 and the substrate 2
By coating an appropriate resin on the first tapered portion 21b by the above-described spin coating or the like, the protective film 23 is formed.
Is formed and cured. In this state, the magneto-optical recording film 22
Is covered with a protective film 23 on the tapered portion 21b.
【００２４】続いて、図３に基づいて、第３の実施の形
態を説明する。Next, a third embodiment will be described with reference to FIG.
【００２５】図３（ｃ）に示すように、光磁気ディスク
３０は基板３１を備え、基板３１の外周縁部３１ａにお
ける角部にはテーパ状部３１ｂが設けられている。この
テーパ状部３１ｂを含む基板３１の表面には、光磁気記
録膜３２が形成されている。さらに、光磁気記録膜３２
の外周縁部３２ａを含む表面は、保護膜３３により被覆
されている。As shown in FIG. 3 (c), the magneto-optical disk 30 includes a substrate 31, and a tapered portion 31b is provided at a corner of an outer peripheral edge 31a of the substrate 31. A magneto-optical recording film 32 is formed on the surface of the substrate 31 including the tapered portion 31b. Further, the magneto-optical recording film 32
The surface including the outer peripheral portion 32 a is covered with a protective film 33.
【００２６】以下、光磁気ディスク３０の製造手順を説
明する。The procedure for manufacturing the magneto-optical disk 30 will be described below.
【００２７】まず、図３（ａ）に示すように、基板３１
の外周縁部３１ａにおける角部にテーパ状部３１ｂを形
成する。ここで、テーパ状部３１ｂの内周端と外周縁部
３１ａとの間の半径方向の間隔ｌ3は１ｍｍ以下程度と
する。First, as shown in FIG.
A tapered portion 31b is formed at a corner of the outer peripheral edge 31a. Here, the radial distance l 3 between the inner peripheral end and the outer peripheral edge portion 31a of the tapered portion 31b is to be about 1mm or less.
【００２８】次に図３（ｂ）に示すように、テーパ状部
３１ｂを含む基板３１の表面に光磁気記録膜３２を形成
する。Next, as shown in FIG. 3B, a magneto-optical recording film 32 is formed on the surface of the substrate 31 including the tapered portion 31b.
【００２９】続いて図３（ｃ）に示すように、光磁気記
録膜３２の表面に保護膜３３をスピンコーティング等に
より塗布し硬化させる。上記の塗布時に保護膜３３を構
成する樹脂は、テーパ状部３１ｂ上の光磁気記録膜３２
に沿って自重により流下し、光磁気記録膜３２の外周縁
部３２ａをも被覆するものである。Subsequently, as shown in FIG. 3C, a protective film 33 is applied on the surface of the magneto-optical recording film 32 by spin coating or the like and cured. The resin constituting the protective film 33 at the time of the above-described coating is a magneto-optical recording film 32 on the tapered portion 31b.
Flows down along its own weight, and also covers the outer peripheral portion 32a of the magneto-optical recording film 32.
【００３０】なお、本実施例の光磁気ディスク３０にお
いて、基板３１のテーパ状部３１ｂ上に形成された光磁
気記録膜３２は、記録に使用しても使用しなくても、い
ずれでも良い。仮に、テーパ状部３１ｂ上の光磁気記録
膜３２を記録に使用しない場合でも、テーパ状部３１ｂ
は半径方向に高々１ｍｍ程度の幅を有するのみであるか
ら、充分な記憶容量を確保できる。In the magneto-optical disk 30 of this embodiment, the magneto-optical recording film 32 formed on the tapered portion 31b of the substrate 31 may or may not be used for recording. Even if the magneto-optical recording film 32 on the tapered portion 31b is not used for recording, the tapered portion 31b
Has a width of at most about 1 mm in the radial direction, so that a sufficient storage capacity can be secured.
【００３１】次に、図４に基づいて参考例について説明
する。Next, a reference example will be described with reference to FIG.
【００３２】図４（ｃ）に示すように、光磁気ディスク
４０は基板４１と、基板４１の表面の全域に形成された
光磁気記録膜４２とを備え、光磁気記録膜４２の表面、
並びに光磁気記録膜４２及び基板４１の外周縁部４２
ａ、４１ａは、樹脂製の保護膜４３により被覆されてい
る。As shown in FIG. 4C, the magneto-optical disk 40 includes a substrate 41 and a magneto-optical recording film 42 formed over the entire surface of the substrate 41.
And the outer peripheral portion 42 of the magneto-optical recording film 42 and the substrate 41
a, 41a are covered with a protective film 43 made of resin.
【００３３】以下、光磁気ディスク４０の製造手順を説
明する。The procedure for manufacturing the magneto-optical disk 40 will be described below.
【００３４】まず、図４（ａ）に示すように、基板４１
の表面の全域に光磁気記録膜４２を形成する。First, as shown in FIG.
A magneto-optical recording film 42 is formed on the entire surface of the substrate.
【００３５】次に、図４（ｂ）に示すように、基板４１
をその内径が基板４１の外径よりやや大きく、その深さ
が基板４１の厚さと同等又はそれ以上である有底箇伏の
ホルダ４４内に同芯となるように位置決めして挿入す
る。Next, as shown in FIG.
Is positioned and inserted coaxially into a bottomed holder 44 whose inner diameter is slightly larger than the outer diameter of the substrate 41 and whose depth is equal to or greater than the thickness of the substrate 41.
【００３６】続いて光磁気記録膜４２上に、保護膜４３
を構成する樹脂をスピンコーティング法等により滴下す
ると、この樹脂は光磁気記録膜４２の表面を被覆し、さ
らに光磁気記録膜４２及び基板４１の外周縁部４２ａ、
４１ａと、ホルダ４４の内周面との間にも流入する。こ
の状態で樹脂を硬化させると、光磁気記録膜４２の表
面、並びに光磁気記録膜４２及び基板４１の外周縁部４
２ａ、４１ａに保護膜４３か形成される。その後、図４
（ｃ）の如く、光磁気ディスク４０がホルダ４４から取
り出される。Subsequently, a protective film 43 is formed on the magneto-optical recording film 42.
Is dropped by a spin coating method or the like, the resin covers the surface of the magneto-optical recording film 42, and further, the outer peripheral edge 42a of the magneto-optical recording film 42 and the substrate 41,
It also flows between 41 a and the inner peripheral surface of the holder 44. When the resin is cured in this state, the surface of the magneto-optical recording film 42 and the outer peripheral portion 4 of the magneto-optical recording film 42 and the substrate 41 are removed.
A protective film 43 is formed on 2a and 41a. Then, FIG.
As shown in (c), the magneto-optical disk 40 is taken out of the holder 44.
【００３７】なお、ホルダ４４における底面及び内周面
に４フツ化エチレン樹脂（商品名：テフロン）等の離型
性の良好な材料からなる離型層４４ａを形成しておく
と、ホルダ４４からの光磁気ディスク４０の取出しが容
易に行える。If a release layer 44a made of a material having good releasability such as tetrafluoroethylene resin (trade name: Teflon) is formed on the bottom surface and the inner peripheral surface of the holder 44, Of the magneto-optical disk 40 can be easily performed.
【００３８】上記の各実施例では、片面記録型の光磁気
ディスクについて述べたか、両面記録型の光磁気ディス
クの場合は、上記のいずれかの方法で製造された２枚の
光磁気ディスクを接着剤等で貼り合わせれば良い。In each of the above embodiments, a single-sided recording type magneto-optical disk has been described. In the case of a double-sided recording type magneto-optical disk, two magneto-optical disks manufactured by any of the above methods are bonded. What is necessary is just to bond with an agent etc.
【００３９】[0039]
【発明の効果】本発明によれば、光磁気記録膜の劣化を
防止した上で、記憶容量を一層増大させることができ
る。 According to the present invention, the deterioration of the magneto-optical recording film is reduced.
Storage capacity can be further increased
You .
【００４０】[0040]
【図１】本発明の一実施形態における光磁気ディスクの
製造手順を示す概略縦断面図である。FIG. 1 is a schematic longitudinal sectional view showing a procedure for manufacturing a magneto-optical disk according to an embodiment of the present invention.
【図２】本発明の他の実施形態における光磁気ディスク
の製造手順を示す概略縦断面図である。FIG. 2 is a schematic longitudinal sectional view showing a procedure for manufacturing a magneto-optical disk according to another embodiment of the present invention.
【図３】本発明のさらに別の実施形態における光磁気デ
ィスクの製造手順を示す概略縦断面図である。FIG. 3 is a schematic longitudinal sectional view showing a procedure for manufacturing a magneto-optical disk according to still another embodiment of the present invention.
【図４】参考例における光磁気ディスクの製造手順を示
す概略縦断面図である。FIG. 4 is a schematic longitudinal sectional view showing a procedure for manufacturing a magneto-optical disk in a reference example .
【図５】従来の光磁気ディスクを示す概略縦断面図であ
る。FIG. 5 is a schematic longitudinal sectional view showing a conventional magneto-optical disk.
【図６】従来の光磁気ディスクにおける光磁気記録膜の
成膜工程を示す概略縦断面図である。FIG. 6 is a schematic longitudinal sectional view showing a step of forming a magneto-optical recording film on a conventional magneto-optical disk.
１０、２０、３０、４０ 光磁気ディスク ｌｌ、２１、３１、４１ 基板 ｌｌａ、２１ａ、３１ａ、４１ａ 外周縁部 １２、２２、３２、４２ 光磁気記録膜 １３、２３、３３、４３ 保護膜 １４ 環状溝 ２１ｂ、３１ｂ テーパ状部 ４４ ホルダ 10, 20, 30, 40 Magneto-optical disk 11, 21, 31, 41 Substrate 11a, 21a, 31a, 41a Outer edge 12, 22, 32, 42 Magneto-optical recording film 13, 23, 33, 43 Protective film 14 Ring Grooves 21b, 31b Tapered portion 44 Holder
───────────────────────────────────────────────────── フロントページの続き (72)発明者 村上 善照 大阪府大阪市阿倍野区長池町22番22号 シャープ株式会社内 (72)発明者 太田 賢司 大阪府大阪市阿倍野区長池町22番22号 シャープ株式会社内 (56)参考文献 特開 昭61−139960（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G11B 11/10 ──────────────────────────────────────────────────続 き Continued on the front page (72) Zensho Murakami, 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Kenji Ota 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp shares In-company (56) References JP-A-61-139960 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) G11B 11/10
Claims (2)
録膜と、光磁気記録膜を保護する保護膜とを備えた光磁
気ディスクにおいて、 前記基板は、外周縁近傍に環状の溝が形成されてなり、 前記光磁気記録膜は、前記溝により分断されており、内
周側の光磁気記録膜の外周縁部が前記溝において前記保
護膜により被覆されてなることを特徴とする光磁気ディ
スク 。At least a light-transmitting substrate and a magneto-optical recording medium are provided.
Magneto-optical device having a recording film and a protective film for protecting the magneto-optical recording film
In the optical disk, the substrate has an annular groove formed in the vicinity of an outer peripheral edge, and the magneto-optical recording film is divided by the groove.
The outer peripheral edge of the peripheral magneto-optical recording film is kept in the groove by the groove.
Magneto-optical disk characterized by being coated with a protective film
Sk .
録膜と、光磁気記録膜を保護する保護膜とを備えた光磁
気ディスクにおいて、 前記基板は、外周縁にテーパ状部を有しており、 前記光磁気記録膜は、前記テーパ状部においてその外周
縁部が前記保護膜により被覆されてなることを特徴とす
る光磁気ディスク 。At least a light-transmitting substrate and a magneto-optical recording medium are provided.
Magneto-optical device having a recording film and a protective film for protecting the magneto-optical recording film
In the optical disk, the substrate has a tapered portion at an outer peripheral edge, and the magneto-optical recording film has an outer peripheral portion at the tapered portion.
The edge is covered with the protective film.
Magneto-optical disk .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP454096A JP2889523B2 (en) | 1996-01-16 | 1996-01-16 | Magneto-optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP454096A JP2889523B2 (en) | 1996-01-16 | 1996-01-16 | Magneto-optical disk |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1121816A Division JP2551994B2 (en) | 1989-05-15 | 1989-05-15 | Method of manufacturing magneto-optical disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08235658A JPH08235658A (en) | 1996-09-13 |
| JP2889523B2 true JP2889523B2 (en) | 1999-05-10 |
Family
ID=11586886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP454096A Expired - Lifetime JP2889523B2 (en) | 1996-01-16 | 1996-01-16 | Magneto-optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2889523B2 (en) |
-
1996
- 1996-01-16 JP JP454096A patent/JP2889523B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08235658A (en) | 1996-09-13 |
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