JPH01150203A - Method for impressing bias magnetic field and recording medium to be used for same - Google Patents
Method for impressing bias magnetic field and recording medium to be used for sameInfo
- Publication number
- JPH01150203A JPH01150203A JP30850087A JP30850087A JPH01150203A JP H01150203 A JPH01150203 A JP H01150203A JP 30850087 A JP30850087 A JP 30850087A JP 30850087 A JP30850087 A JP 30850087A JP H01150203 A JPH01150203 A JP H01150203A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- bias magnetic
- recording
- recording medium
- applying means
- 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
- 238000000034 method Methods 0.000 title claims description 14
- 239000011241 protective layer Substances 0.000 claims description 15
- 239000011521 glass Substances 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000005341 toughened glass Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 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
- G11B11/10584—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
-
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
- G11B17/32—Maintaining desired spacing between record carrier and head, e.g. by fluid-dynamic spacing
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、バイアス磁界印加方法、更に詳細には、特に
オーバーライド（重ね書き）に好適な光磁気記録再生装
置におけるバイアス磁界印加方法及びこれに使用する記
録媒体に関する。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for applying a bias magnetic field, and more particularly, a method for applying a bias magnetic field in a magneto-optical recording/reproducing device particularly suitable for overwriting (overwriting), and a method for applying a bias magnetic field therein. Regarding the recording medium used.
（従来の技術）
テープレコーダ等の通常の磁気記録再生装置においては
、先行する消去ヘッドで記録媒体を消去状態とし、次い
で消去ヘッドの隣に配設された記録ヘッドで記録すると
いうことが行なわれている。光磁気記録再生装置におい
ても、同様の考え方で情報の消去・記録ができるように
なった。(Prior Art) In ordinary magnetic recording and reproducing devices such as tape recorders, a preceding erasing head erases a recording medium, and then a recording head disposed next to the erasing head performs recording. ing. Information can now be erased and recorded using a similar concept in magneto-optical recording and reproducing devices.
第３図は、記録媒体上の情報の消去・記録が可能な光情
報記録装置（特開昭６１−２１４２５２号公報）の要部
の概略説明図で、図中、ｌは消去用の光学ヘッド、２は
書き込み（記録）用の光学ヘッド、３は消去用のバイア
ス磁界と書き込み用のバイアス磁界の付与手段が一体化
された外部磁界発生素子、４は光磁気ディスクである。FIG. 3 is a schematic explanatory diagram of the main parts of an optical information recording device (Japanese Unexamined Patent Publication No. 61-214252) that is capable of erasing and recording information on a recording medium, and in the figure, l is an optical head for erasing. , 2 is an optical head for writing (recording), 3 is an external magnetic field generating element in which means for applying an erasing bias magnetic field and a writing bias magnetic field are integrated, and 4 is a magneto-optical disk.
光磁気ディスク４には透明基板５上に磁化容易軸を有す
る記録膜６が形成されている。光磁気ディスク４は、図
示しない駆動手段によって図の左から右方向へ移動し、
移動しつつ消去用の光学ヘッド１で情報が消去され、次
いで書き込み用の光学ヘッド２で情報の記録が行なわれ
て行く。In the magneto-optical disk 4, a recording film 6 having an axis of easy magnetization is formed on a transparent substrate 5. The magneto-optical disk 4 is moved from left to right in the figure by a drive means (not shown),
While moving, information is erased by the erasing optical head 1, and then information is recorded by the writing optical head 2.
また、第４図は、記録媒体上の情報の消去・記録が可能
な光磁気記録装置（特開昭６２−１１５５号公報）の要
部の概略説明図である。図中、８は対物レンズ、９は全
反射ミラー、１０はバイモルフ素子で、３〜６は第２図
におけると同じ意味を示す。対物レンズ８及び全反射ミ
ラー９等により光学ヘッドが構成されていて、この光学
ヘッドはバイモルフ素子１１によって移動自在に設けら
れている。そして、消去時には、光学ヘッドは消去用の
バイアス磁界側に設置され、記録時には、光学ヘッドは
記録用のバイアス磁界側に設置される。すなわち、一つ
の光学ヘッドで消去・記録ができるようになっている。Further, FIG. 4 is a schematic explanatory diagram of the main parts of a magneto-optical recording device (Japanese Patent Application Laid-open No. 1155/1983) capable of erasing and recording information on a recording medium. In the figure, 8 is an objective lens, 9 is a total reflection mirror, 10 is a bimorph element, and 3 to 6 have the same meanings as in FIG. 2. The objective lens 8, total reflection mirror 9, etc. constitute an optical head, and this optical head is provided movably by a bimorph element 11. During erasing, the optical head is placed on the side of the bias magnetic field for erasing, and during recording, the optical head is placed on the side of the bias magnetic field for recording. In other words, erasing and recording can be performed with one optical head.
（発明が解決すべき問題点）
しかしながら、従来の光磁気記録再生装置には、次の問
題点があった。すなわち、従来装置においては、前記外
部磁界発生素子３は、光磁気ディスクから例えば１ ｍ
ｍ程度離して設置される。(Problems to be Solved by the Invention) However, the conventional magneto-optical recording and reproducing apparatus has the following problems. That is, in the conventional device, the external magnetic field generating element 3 is placed at a distance of, for example, 1 m from the magneto-optical disk.
They are installed at a distance of about m.
このため、動作時に光磁気ディスク面上のバイアス磁界
の強度が弱くなる。そして、弱くなるのを防ぐためには
、その分強力な磁界発生素子を用いなければならない。Therefore, the intensity of the bias magnetic field on the magneto-optical disk surface becomes weak during operation. In order to prevent the magnetic field from becoming weaker, it is necessary to use a correspondingly stronger magnetic field generating element.
また、外部磁界発生素子のＮ極とＳ極間の距離は、消去
過程と記録過程との時間間隔ができるだけ接近している
ことが望ましいとの理由からできるだけ短い方が好まし
いか、磁極を近付けると光磁気ディスク面上での磁界分
布が悪くなってしまう。更にまた、光磁気ディスクの面
振れにより、光磁気ディスク面上のバイアス磁界強度が
変化し、結果として消去・記録にムラが発生することが
あった。In addition, it is preferable that the distance between the N and S poles of the external magnetic field generating element be as short as possible because it is desirable that the time interval between the erasing process and the recording process be as close as possible, or if the magnetic poles are brought closer together. The magnetic field distribution on the magneto-optical disk surface becomes poor. Furthermore, due to surface runout of the magneto-optical disk, the bias magnetic field strength on the surface of the magneto-optical disk may change, resulting in uneven erasing and recording.
本発明は、従来の光ｒＪｉｌ気記録再記録再生装置る」
二記問題点を解決し、情報の正確な消去・記録が可能で
、かつ、装置の小型化、低電力化を図ることのできるバ
イアス磁界印加方法を提供することを目的とする。The present invention is a conventional optical recording/reproducing device.
It is an object of the present invention to provide a method for applying a bias magnetic field that can solve the problems mentioned above, enable accurate erasing and recording of information, and reduce the size and power consumption of the device.
（問題点を解決するための手段）
本発明は、第１のバイアス磁界付与手段と第２のバイア
ス磁界付与手段とが一体化されていて、第１のバイアス
磁界付与手段を用いて記録媒体の情報の消去を行ない、
第２のバイアス磁界付与手段を用いて記録媒体に情報の
記録を行なう光磁気記録再生におけるバイアス磁界印加
方法において、表面に硬質保護層を設けた記録媒体を用
い、かつ、前記第１及び第２のバイアス磁界付与手段を
この硬質保護層上に接触摺動せしめつつ情報の消去又は
記録を行なうことを特徴とするバイアス６ｎ界印加方法
である。(Means for Solving the Problems) The present invention is characterized in that the first bias magnetic field applying means and the second bias magnetic field applying means are integrated, and the first bias magnetic field applying means is used to control the recording medium. Delete information,
In a method for applying a bias magnetic field in magneto-optical recording and reproducing for recording information on a recording medium using a second bias magnetic field applying means, a recording medium having a hard protective layer provided on the surface is used, and the first and second This is a method for applying a bias 6n field characterized in that information is erased or recorded while the bias magnetic field applying means is brought into contact and slid on the hard protective layer.
（イ乍用）
記録媒体、例えば光磁気ディスクの表面に設けられる硬
質保護層は、バイアス磁界付与手段、例えば永久磁石と
の接触を滑らかにし、かつ、記録膜を保護する機能を有
する。(For A) A hard protective layer provided on the surface of a recording medium, such as a magneto-optical disk, has the function of smoothing contact with a bias magnetic field applying means, such as a permanent magnet, and protecting the recording film.
そして、この硬質保護層は、その膜厚が極めて小さいの
で、バイアス磁界と光磁気ディスクの記録膜との距離を
可能な限り狭めることができ、バイアス磁界Ｒ界を記録
膜に有効に作用させることができる。Since this hard protective layer has an extremely small film thickness, the distance between the bias magnetic field and the recording film of the magneto-optical disk can be made as narrow as possible, and the bias magnetic field R field can effectively act on the recording film. Can be done.
（発明の実施例） 以下、本発明を実施例を示す図面と共に説明する。(Example of the invention) Hereinafter, the present invention will be explained with reference to drawings showing embodiments.
本発明方法においては、表面に硬質保ｈＶｔ層を設けた
記録媒体が使用される。記録媒体としては、例えば光磁
気ディスクが挙げられ、その表面に硬質保護層を設ける
ことのできる光磁気記録用のものであればいずれも使用
することができる。記録媒体の基板としては、例えばガ
ラス、プラスチック等が挙げられる。硬質保護層として
は、例えば強化処理されたガラス、フォトポリマー、カ
ーボン等が挙げられ、特に強化処理されたガラスが好適
である。硬質保護層の膜厚は、薄い程好ましいが、１１
００ＬＬ程度でも良い結果を与える。硬質保護層は、上
記材質のものをそのまま用いることができるが、更にバ
イアス磁界付与手段との摩擦を低減するため、その表面
に油層を塗布、あるいはカーボン等をコーティングする
とよい。In the method of the present invention, a recording medium having a hard HVt layer provided on its surface is used. Examples of the recording medium include magneto-optical disks, and any medium for magneto-optical recording on which a hard protective layer can be provided can be used. Examples of the substrate of the recording medium include glass and plastic. Examples of the hard protective layer include tempered glass, photopolymer, carbon, etc., and tempered glass is particularly suitable. The thickness of the hard protective layer is preferably thinner, but 11
Even around 00LL gives good results. The hard protective layer made of the above-mentioned material can be used as it is, but in order to further reduce the friction with the bias magnetic field applying means, it is preferable to coat the surface with an oil layer or with carbon or the like.
第１及び第２のバイアス磁界付与手段としては、永久磁
石、電磁石のいずれをも使用でき、本発明においては、
永久磁石が好適に使用される。Either a permanent magnet or an electromagnet can be used as the first and second bias magnetic field applying means, and in the present invention,
Permanent magnets are preferably used.
バイアス磁界付与手段としては、例えば断面コ字状の縦
長のものが使用され、Ｎ極、Ｓ極の一方が消去用の第１
のバイアス磁界付与手段、他方が記録用の第２のバイア
ス磁界付与手段となる。このように、第１及び第２のバ
イアス磁界付与手段は一体化された構成になっている。As the bias magnetic field applying means, for example, a vertically elongated one having a U-shaped cross section is used, and one of the N pole and the S pole is the first one for erasing.
The bias magnetic field applying means is the bias magnetic field applying means, and the other is the second bias magnetic field applying means for recording. In this way, the first and second bias magnetic field applying means have an integrated structure.
第１図は、本発明方法の使用状態を示す説明図であって
、構造的には第２図のＡ−Ａ断面図である。図中、１は
消去用の光学ヘッド、２は記録用の光学ヘッド、３は外
部磁界発生素子、５は透明基板、６は記録膜、１１は硬
質保護層、１２は第１のバイアス磁界付与手段（Ｎ極又
はＳ極）、１３は第２のバイアス磁界付与手段（Ｓ極又
はＮ極）、１４は記録媒体である。記録媒体１４は、基
板５上に記録膜６及び硬質保護層１１を重ねた構造のも
のである。第１図に示すように、第１及び第２のバイア
ス磁界付与手段１２．１３は、磁界の強い先端部におい
て記録媒体１４の硬ダ１保、ＪＦｉ１１に接触している
。そして、記録媒体１４は、この状態で矢印方向に図示
しない駆動手段により駆動され、第１及び第２のバイア
ス磁界付与手段１２．１３が硬質保護層ｌｌ上を摺動し
た状態で常法に従って消去あるいは記録か行なわれる。FIG. 1 is an explanatory diagram showing the usage state of the method of the present invention, and is structurally a sectional view taken along the line AA in FIG. 2. In the figure, 1 is an optical head for erasing, 2 is an optical head for recording, 3 is an external magnetic field generating element, 5 is a transparent substrate, 6 is a recording film, 11 is a hard protective layer, 12 is a first bias magnetic field application 13 is a second bias magnetic field applying means (S pole or N pole); and 14 is a recording medium. The recording medium 14 has a structure in which a recording film 6 and a hard protective layer 11 are stacked on a substrate 5. As shown in FIG. 1, the first and second bias magnetic field applying means 12, 13 are in contact with the hard disk 1 and JFi 11 of the recording medium 14 at the tip portions where the magnetic field is strong. In this state, the recording medium 14 is driven by a driving means (not shown) in the direction of the arrow, and erased according to a conventional method while the first and second bias magnetic field applying means 12.13 are sliding on the hard protective layer 11. Or recorded.
第２図は、記録媒体１４と外部磁界発生素子３との位置
関係を示す図で、外部１１界発生素子３は、この図に示
すように記録媒体１４の周縁部から中心部に至るほぼ半
径長さのものを用いれば、光学ヘッドｌあるいは２と共
に移動させる必要がなくなるので好ましい。FIG. 2 is a diagram showing the positional relationship between the recording medium 14 and the external magnetic field generating element 3. As shown in this figure, the external magnetic field generating element 3 has an approximate radius from the periphery to the center of the recording medium 14. It is preferable to use a long one because it eliminates the need to move it together with the optical head 1 or 2.
（発明の効果）
本発明によれば、バイアスｆＪｉ界の強度を簡易に高め
ることができ、バイアス磁界付与手段を記録膜に近づけ
た分だけ磁極間の距離を近づけても良好な６１主界を得
ることができ、また面振れの影響はほとんど完全に除く
ことができる。(Effects of the Invention) According to the present invention, the strength of the bias fJi field can be easily increased, and even if the distance between the magnetic poles is shortened by bringing the bias magnetic field applying means closer to the recording film, a good 61 main field can be maintained. In addition, the influence of surface runout can be almost completely eliminated.
その他、外部磁界発生素子としての永久磁石の小型化が
可能になり、安価な低磁力の磁石も使えるようになる。In addition, it becomes possible to downsize the permanent magnet used as the external magnetic field generating element, and it also becomes possible to use inexpensive magnets with low magnetic force.
第１図は本発明方法の使用状態を示す図、第２図は記録
媒体と外部磁界発生素子との位置関係を示す図、第３図
、第４図はいずれも従来の光磁気記録再生装置の要部の
概略説明図である。
ｌ・・・消去用光学ヘッド、２・・・記録（書き込み）
用光学ヘッド、３・・・外部磁界発生素子、５・・・透
明基板、６・・・記録膜、１１・・・硬質保護層、１２
・・・第１のバイアス磁界付与手段、１３・・・第２の
バイアス磁界付与手段、１４・・・記録媒体。
第１図
第２図Fig. 1 is a diagram showing the usage state of the method of the present invention, Fig. 2 is a diagram showing the positional relationship between the recording medium and the external magnetic field generating element, and Figs. 3 and 4 are both conventional magneto-optical recording and reproducing devices. FIG. l... Optical head for erasing, 2... Recording (writing)
Optical head for use, 3... External magnetic field generating element, 5... Transparent substrate, 6... Recording film, 11... Hard protective layer, 12
. . . first bias magnetic field applying means, 13 . . . second bias magnetic field applying means, 14 . . . recording medium. Figure 1 Figure 2
Claims (1)
付与手段とが一体化されていて、第１のバイアス磁界付
与手段を用いて記録媒体の情報の消去を行ない、第２の
バイアス磁界付与手段を用いて記録媒体に情報の記録を
行なう光磁気記録再生におけるバイアス磁界印加方法に
おいて、表面に硬質保護層を設けた記録媒体を用い、か
つ、前記第１及び第２のバイアス磁界付与手段をこの硬
質保護層上に接触摺動せしめつつ情報の消去又は記録を
行なうことを特徴とするバイアス磁界印加方法。 ２、少なくともその一方の表面に、バイアス磁界付与手
段との接触面の保護のための硬質保護層を設けたことを
特徴とする記録媒体。[Claims] 1. The first bias magnetic field applying means and the second bias magnetic field applying means are integrated, and the first bias magnetic field applying means is used to erase information on the recording medium, In a method for applying a bias magnetic field in magneto-optical recording and reproducing for recording information on a recording medium using a second bias magnetic field applying means, a recording medium having a hard protective layer provided on the surface is used, and the first and second A method for applying a bias magnetic field, characterized in that erasing or recording information is performed while sliding a bias magnetic field applying means on the hard protective layer. 2. A recording medium characterized in that a hard protective layer is provided on at least one surface of the medium to protect the contact surface with the bias magnetic field applying means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30850087A JPH01150203A (en) | 1987-12-08 | 1987-12-08 | Method for impressing bias magnetic field and recording medium to be used for same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30850087A JPH01150203A (en) | 1987-12-08 | 1987-12-08 | Method for impressing bias magnetic field and recording medium to be used for same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01150203A true JPH01150203A (en) | 1989-06-13 |
Family
ID=17981762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30850087A Pending JPH01150203A (en) | 1987-12-08 | 1987-12-08 | Method for impressing bias magnetic field and recording medium to be used for same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01150203A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0455158A2 (en) * | 1990-04-28 | 1991-11-06 | Sony Corporation | Recording and reproducing apparatus for using magneto-optical disc |
| US5247496A (en) * | 1990-04-28 | 1993-09-21 | Sony Corporation | Recording and/or reproducing apparatus for using magneto-optical disc |
| WO1995030986A1 (en) * | 1994-05-10 | 1995-11-16 | Hitachi Maxell, Ltd. | Magnetooptical recording medium, and method and apparatus for recording/reproduction |
| USRE35608E (en) * | 1990-04-28 | 1997-09-16 | Sony Corporation | Recording and/or reproducing apparatus for using magneto-optical disc |
-
1987
- 1987-12-08 JP JP30850087A patent/JPH01150203A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0455158A2 (en) * | 1990-04-28 | 1991-11-06 | Sony Corporation | Recording and reproducing apparatus for using magneto-optical disc |
| US5247496A (en) * | 1990-04-28 | 1993-09-21 | Sony Corporation | Recording and/or reproducing apparatus for using magneto-optical disc |
| USRE35608E (en) * | 1990-04-28 | 1997-09-16 | Sony Corporation | Recording and/or reproducing apparatus for using magneto-optical disc |
| WO1995030986A1 (en) * | 1994-05-10 | 1995-11-16 | Hitachi Maxell, Ltd. | Magnetooptical recording medium, and method and apparatus for recording/reproduction |
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