JPH0254450A - Magneto-optical disk - Google Patents
Magneto-optical diskInfo
- Publication number
- JPH0254450A JPH0254450A JP63206740A JP20674088A JPH0254450A JP H0254450 A JPH0254450 A JP H0254450A JP 63206740 A JP63206740 A JP 63206740A JP 20674088 A JP20674088 A JP 20674088A JP H0254450 A JPH0254450 A JP H0254450A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- head
- optical disk
- medium
- optical
- 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
- 230000003287 optical effect Effects 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000151 deposition Methods 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
- 239000000314 lubricant Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229920003217 poly(methylsilsesquioxane) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- 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
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/1058—Flying heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/64—Back-rests or cushions
-
- 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
- G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
Abstract
Description
【発明の詳細な説明】
〔概 要〕
光磁気ディスクを記憶媒体とし光ヘッドで情報の記録、
再生を行う記憶装置、特に高記録密度の実現を可能にす
る光磁気ディスクの層構成に関し、ヘッドの焦点か全情
報記憶領域において媒体上に結像し、高度な記憶密度が
得られる光磁気ディスクの提供を目的とし、
光磁気ディスクを記憶媒体とし浮上型光ヘッドで情報の
記録、再生を行う記憶装置において、膜厚が記憶媒体の
回転中心からの距離の関数で表され、且つ光が透過する
被覆膜を記憶媒体の上に形成し構成する。[Detailed Description of the Invention] [Summary] Information is recorded using an optical head using a magneto-optical disk as a storage medium.
Regarding the layer structure of storage devices that perform playback, especially magneto-optical disks that enable the realization of high recording densities, magneto-optical disks that form an image on the medium either at the focal point of the head or in the entire information storage area, resulting in a high level of storage density. In a storage device that uses a magneto-optical disk as a storage medium and records and reproduces information with a floating optical head, the film thickness is expressed as a function of the distance from the center of rotation of the storage medium, and the film thickness is expressed as a function of the distance from the center of rotation of the storage medium, and A coating film is formed on the storage medium.
本発明は光磁気ディスクを記憶媒体とし光ヘッドで情報
の記録、再生を行う記憶装置に係り、特に高記録密度の
実現を可能にする光磁気ディスクの層構成に関する。The present invention relates to a storage device that uses a magneto-optical disk as a storage medium and records and reproduces information using an optical head, and particularly relates to a layer structure of a magneto-optical disk that enables high recording density.
高速で回転する光磁気ディスクに間隙を介して光ヘッド
を対向せしめ、光磁気ディスクを記憶媒体として情報の
記録、再生を行う光磁気ディスク記憶装置は、現在大容
量記憶装置として利用されている光記憶装置と同等の高
密度記録が可能で、記録、再生に加えて消去が任意に行
えることからその実用化が属望されている。Magneto-optical disk storage devices, in which an optical head is opposed to a magneto-optical disk rotating at high speed through a gap, record and reproduce information using the magneto-optical disk as a storage medium, are optical disks currently used as mass storage devices. Since it is possible to perform high-density recording equivalent to that of a storage device, and in addition to recording and reproduction, erasing can be performed at will, and its practical application is desired.
かかる装置において高速で回転する光磁気ディスクに、
所定の間隙を介して光ヘッドを対向セしめる手段として
、磁気ディスク記憶装置と同様に光磁気ディスクの風圧
で光ヘッドを浮上させる方法がある。しかし光磁気ディ
スクの風圧で光へラドを浮上させる方法は、光磁気ディ
スクの線速度が回転中心では小さく周縁部に近づく程大
きくなり、光磁気ディスクと光ヘッドの間隙は回転中心
からの距離に依存する。In such a device, a magneto-optical disk rotating at high speed is
As a means for setting the optical heads to face each other with a predetermined gap therebetween, there is a method in which the optical heads are levitated by the wind pressure of a magneto-optical disk, similar to a magnetic disk storage device. However, in the method of levitating the optical head using the wind pressure of the magneto-optical disk, the linear velocity of the magneto-optical disk is small at the center of rotation and increases as it approaches the periphery, and the gap between the magneto-optical disk and the optical head increases as the distance from the center of rotation increases. Dependent.
一方光磁気ディスク記憶装置において高密度記録を行う
には、常に光ヘッドの焦点を光磁気ディスクの媒体上に
結像させる必要がある。そこで高速で回転する光磁気デ
ィスクを記憶媒体とし、浮上型光ヘッドで情報の記録、
再生を行う記憶装置を実現させるには、常に光ヘッドの
焦点を光磁気ディスクの媒体上に結像させることのでき
る、浮上型光ヘッド若しくは光磁気ディスクが開発され
なければならない。On the other hand, in order to perform high-density recording in a magneto-optical disk storage device, it is necessary to always focus the optical head on the magneto-optical disk medium. Therefore, a magneto-optical disk that rotates at high speed is used as a storage medium, and a floating optical head is used to record information.
In order to realize a storage device that performs reproduction, a floating optical head or magneto-optical disk must be developed that can always focus the optical head on the magneto-optical disk medium.
第３図は通常の磁気ディスクを示す断面斜視図、第４図
はヘッド位置と浮上量の関係を示す図である。FIG. 3 is a cross-sectional perspective view showing an ordinary magnetic disk, and FIG. 4 is a diagram showing the relationship between the head position and the flying height.
通常の磁気ディスクは第３図に示す如くドーナツツ状円
板１に、記憶媒体となる磁性膜２がほぼ一様な膜厚で形
成されており、高速回転する磁気ディスクに例えば板ば
ね３で支持された磁気ヘッド４を対向させると、磁気デ
ィスクの風圧によって磁気へラド４は持ち上げられ、磁
気ディスクと磁気ヘッド４との間に磁気ディスクの線速
度に対応した間隙が生じる。As shown in FIG. 3, a typical magnetic disk has a donut-shaped disk 1 on which a magnetic film 2 serving as a storage medium is formed with a substantially uniform thickness, and is supported by a leaf spring 3, for example, on a magnetic disk rotating at high speed. When the magnetic heads 4 are faced to each other, the magnetic head 4 is lifted by the wind pressure of the magnetic disk, and a gap corresponding to the linear velocity of the magnetic disk is created between the magnetic disk and the magnetic head 4.
ここで磁気ヘッドの浮上量をＴ、磁気ディスクの線速度
をｖ、１気デイスクの回転中心から磁気ヘッドまでの距
離をＲとすると、
Ｔｌ３ＪＶ Ｖ＝ωＲ
で表される。即ち磁気ヘッドの浮上量Ｔは磁気ディスク
の線速度■の平方根に比例し、磁気ディスクの回転中心
から磁気ヘッドまでの距離をＲの平方根に比例する。第
４図はこのようなヘッド位置と浮上量の関係を示してい
る。Here, if the flying height of the magnetic head is T, the linear velocity of the magnetic disk is v, and the distance from the rotation center of the 1st disk to the magnetic head is R, then Tl3JV V=ωR. That is, the flying height T of the magnetic head is proportional to the square root of the linear velocity (2) of the magnetic disk, and the distance from the rotation center of the magnetic disk to the magnetic head is proportional to the square root of R. FIG. 4 shows the relationship between the head position and the flying height.
高速で回転する光磁気ディスクに浮上型光ヘッドを対向
せしめ、情報の記録、再生を行う光磁気ディスク記憶装
置において、光磁気ディスク上に形成された被膜の膜厚
が磁気ディスクと同様に一様であれば、光ヘッドの浮上
量はその位置における媒体の線速度に左右され、フォー
カシング機構を持たない浮上型光ヘッドの焦点を全記憶
領域において、光磁気ディスクの媒体上に結像させるこ
とができないという問題があった。In magneto-optical disk storage devices that record and reproduce information by placing a floating optical head facing a magneto-optical disk that rotates at high speed, the film thickness of the film formed on the magneto-optical disk is uniform like that of the magnetic disk. If so, the flying height of the optical head depends on the linear velocity of the medium at that position, and it is possible to focus the flying optical head, which does not have a focusing mechanism, on the medium of the magneto-optical disk in the entire storage area. The problem was that I couldn't do it.
本発明の目的はヘッドの焦点が全情報記憶領域において
媒体上に結像し、高度な記憶密度が得られる光磁気ディ
スクを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a magneto-optical disk in which the focal point of the head forms an image on the medium in the entire information storage area and a high storage density can be obtained.
第１図は本発明になる光磁気ディスクを示す断面斜視図
である。なお全図を通し同じ対象物は同一記号で表して
いる。FIG. 1 is a cross-sectional perspective view showing a magneto-optical disk according to the present invention. The same objects are represented by the same symbols throughout the figures.
上記課題は光磁気ディスクを記憶媒体とし浮上型光ヘッ
ドで情報の記録、再生を行う記憶装置において、膜厚が
記憶媒体５の回転中心からの距離の関数で表され且つ光
を透過せしめる被覆膜６が、記憶媒体５の上に形成され
てなる本発明の光磁気ディスクにより達成される。The above-mentioned problem arises in a storage device that uses a magneto-optical disk as a storage medium and records and reproduces information with a floating optical head. This is achieved by the magneto-optical disk of the present invention in which the film 6 is formed on the storage medium 5.
第１図において光磁気ディスクを構成する記憶媒体の上
に、膜厚が記憶媒体の回転中心からの距離の関数で表さ
れ、且つ光を透過せしめる被覆膜を被着せしめることに
よって、光ヘッドと記憶媒体との焦点距離を一定にする
ことが可能になり、ヘッドの焦点が全情報記憶領域にお
いて媒体上に結像し、高度な記憶密度が得られる光磁気
ディスクを提供することができる。In FIG. 1, an optical head is formed by depositing a coating film on the storage medium constituting the magneto-optical disk, the thickness of which is expressed as a function of the distance from the center of rotation of the storage medium, and which allows light to pass through. It becomes possible to make the focal distance between the head and the storage medium constant, the focal point of the head forms an image on the medium in the entire information storage area, and it is possible to provide a magneto-optical disk that can obtain a high storage density.
以下添付図により本発明の実施例について説明する。第
２図は本発明になる光磁気ディスクの作用を説明する模
式図である。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 2 is a schematic diagram illustrating the operation of the magneto-optical disk according to the present invention.
第１図において本発明になる光磁気ディスクはドーナノ
ツ状円板１に、はぼ−様な膜厚を有する記憶媒体５と光
を透過せしめる被覆膜６が形成されており、被覆膜６は
記憶媒体５の回転中心からの距離の関数で表される膜厚
を有する。In FIG. 1, the magneto-optical disk according to the present invention includes a donut-shaped disk 1, on which a storage medium 5 having a hollow film thickness and a coating film 6 that transmits light are formed. has a film thickness expressed as a function of the distance from the center of rotation of the storage medium 5.
第２図においてヘッドと記憶媒体との物理的距離をＤ、
その光学的距離をし、記憶媒体の回転中心からヘッドま
での距離をＲ、ヘッドの浮上量をＴ （Ｒ） 、被覆膜
の膜厚をＨ（Ｒ） 、屈折率をＮとし、Ａ、、Ｂ、Ｂ’
を定数とすると、Ｄ＝Ｔ （Ｒ）＋Ｈ（Ｒ）
Ｌ＝Ｔ （Ｒ）＋Ｎ−Ｈ（Ｒ）
で表される。上式においてヘッドの浮上量がＴ （Ｒ）
＝Ａ・ （Ｒ） ＋Ｂ
で表されるものとするとＬを一定にするにはＮ−Ｈ（Ｒ
）＝−Ａ・ （Ｒ）＋Ｂ’
即ち被覆膜の膜厚Ｈ（Ｒ）が
でなければならない。In FIG. 2, the physical distance between the head and the storage medium is D,
The optical distance is R, the distance from the center of rotation of the storage medium to the head is R, the flying height of the head is T (R), the thickness of the coating film is H (R), the refractive index is N, and A, ,B,B'
When is a constant, it is expressed as D=T(R)+H(R) L=T(R)+NH(R). In the above formula, the flying height of the head is T (R)
=A・(R) +B To make L constant, N−H(R
)=-A·(R)+B' In other words, the thickness H(R) of the coating film must be.
（以下余白）
上記膜厚分布を有する被覆膜はスピンコードや蒸着、或
いはスパッタ等の手段で、例えばパラフィンにフロロカ
ーボン系潤滑剤をしみ込ませた有機膜、酸化シリコンや
光重合ポリマー（ガラスレジン）等を用い容易に形成す
ることができる。(Left below) The coating film having the above film thickness distribution can be formed by means such as spin cord, vapor deposition, or sputtering, such as an organic film made by impregnating paraffin with a fluorocarbon lubricant, silicon oxide, or a photopolymerized polymer (glass resin). It can be easily formed using, etc.
このように光磁気ディスクを構成する記憶媒体の上に、
膜厚が記憶媒体の回転中心からの距離の関数で表され、
且つ光を透過せしめる被覆膜を被着せしめることによっ
て、光ヘッドと記憶媒体との焦点距離を一定にすること
が可能になり、ヘッドの焦点が全情報記憶領域において
媒体上に結像し、高度な記憶密度が得られる光磁気ディ
スクを実現することができる。In this way, on the storage medium that makes up the magneto-optical disk,
The film thickness is expressed as a function of the distance from the center of rotation of the storage medium,
In addition, by applying a coating film that transmits light, it becomes possible to keep the focal distance between the optical head and the storage medium constant, so that the focal point of the head forms an image on the medium in the entire information storage area, and A magneto-optical disk with high storage density can be realized.
上述の如く本発明によればヘッドの焦点が全情報記憶領
域において媒体上に結像し、高度な記憶密度が得られる
光磁気ディスクを提供することができる。As described above, according to the present invention, it is possible to provide a magneto-optical disk in which the focal point of the head forms an image on the medium in the entire information storage area and a high storage density can be obtained.
第１図は本発明になる光磁気ディスクを示す断面斜視図
、
第２図は本発明になる光磁気ディスクの作用を説明する
模式図、
第３図は通常の磁気ディスクを示す断面斜視図、第４図
はヘッド位置と浮上量の関係を示す図、である。図にお
いて
１はドーナソツ状円板、
５は記ｔｑ媒体、
６は被覆膜、
をそれぞれ表す。
第７ 口
回転中１じη゛ら／）ｆｆ巨藷（ｍｍ）ま発」月（：す
る光）焔気テンズグのづ斜用乞１１１ｅ月１ろイ更式回
ｖ ２ 口FIG. 1 is a cross-sectional perspective view showing a magneto-optical disk according to the present invention, FIG. 2 is a schematic diagram illustrating the operation of the magneto-optical disk according to the present invention, and FIG. 3 is a cross-sectional perspective view showing a normal magnetic disk. FIG. 4 is a diagram showing the relationship between head position and flying height. In the figure, 1 represents a doughnut-shaped disk, 5 represents the TQ medium, and 6 represents a coating film. 7th mouth rotation 1ji η゛ra/) ff gigantic (mm) birth' moon (: light) flames tenzugu nozukari yobori 111e month 1 roi changing ceremony times v 2 mouth
Claims (1)
記録、再生を行う記憶装置において、膜厚が記憶媒体（
５）の回転中心からの距離の関数で表され且つ光を透過
せしめる被覆膜（６）が、記憶媒体（５）の上に形成さ
れてなることを特徴とする光磁気ディスク。In a storage device that uses a magneto-optical disk as a storage medium and uses a floating optical head to record and reproduce information, the film thickness of the storage medium (
5) A magneto-optical disk characterized in that a coating film (6) that is expressed as a function of the distance from the center of rotation and that transmits light is formed on a storage medium (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63206740A JPH0254450A (en) | 1988-08-19 | 1988-08-19 | Magneto-optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63206740A JPH0254450A (en) | 1988-08-19 | 1988-08-19 | Magneto-optical disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0254450A true JPH0254450A (en) | 1990-02-23 |
Family
ID=16528318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63206740A Pending JPH0254450A (en) | 1988-08-19 | 1988-08-19 | Magneto-optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0254450A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0461911A2 (en) * | 1990-06-13 | 1991-12-18 | Sharp Kabushiki Kaisha | Magneto-optical disk and manufacturing methods thereof |
| JPH04501453A (en) * | 1988-11-07 | 1992-03-12 | アライド・シグナル・インコーポレーテツド | Day coupler shaft and air turbine starter with day coupler shaft |
-
1988
- 1988-08-19 JP JP63206740A patent/JPH0254450A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04501453A (en) * | 1988-11-07 | 1992-03-12 | アライド・シグナル・インコーポレーテツド | Day coupler shaft and air turbine starter with day coupler shaft |
| EP0461911A2 (en) * | 1990-06-13 | 1991-12-18 | Sharp Kabushiki Kaisha | Magneto-optical disk and manufacturing methods thereof |
| US5233597A (en) * | 1990-06-13 | 1993-08-03 | Sharp Kabushiki Kaisha | Magneto-optical disk having a layer of varying thickness |
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