JPS6355746A - Recording device for magneto-optical recording medium - Google Patents
Recording device for magneto-optical recording mediumInfo
- Publication number
- JPS6355746A JPS6355746A JP19815086A JP19815086A JPS6355746A JP S6355746 A JPS6355746 A JP S6355746A JP 19815086 A JP19815086 A JP 19815086A JP 19815086 A JP19815086 A JP 19815086A JP S6355746 A JPS6355746 A JP S6355746A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- magnetic field
- core
- disk
- coil
- 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 description 15
- 239000010410 layer Substances 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 230000015654 memory Effects 0.000 description 5
- 230000001678 irradiating effect Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 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】
〔産業上の利用分野〕
本発明は、光と磁気とを利用して記録できる媒体の記録
装置に関し、特にこうした光磁気記録媒体に対して、変
調された磁場を加えつつ光ビームを照射して記録を行な
う記録磁場変調方式の記録装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording device for a medium capable of recording using light and magnetism, and particularly to a recording device for recording a medium that can record using light and magnetism, and in particular, a method for applying a modulated magnetic field to such a magneto-optical recording medium. The present invention relates to a recording device using a recording magnetic field modulation method that performs recording by irradiating a light beam.
従来より、高密度に情報を記録するメモリとして、Ｍｎ
Ｂ ｉ 、希土類−遷移金属系アモルファス合金などの
磁性薄膜を、情報記録用の媒体に用いた光磁気メモリが
知られている。Conventionally, Mn has been used as a memory that records information at high density.
2. Description of the Related Art Magneto-optical memories using magnetic thin films such as B i and rare earth-transition metal-based amorphous alloys as information recording media are known.
これらのメモリは、情報の消去が容易に行なえる点から
非常に有用なものである。These memories are very useful because information can be easily erased.
光磁気メモリへの記録方式としては、従来から光変調方
式と記録磁場変調方式とが知られている。Conventionally, optical modulation methods and recording magnetic field modulation methods have been known as recording methods for magneto-optical memories.
光変調方式は、一定の記録バイアス磁場を付与すると共
に、記録情報によって変調された光ビームを記録媒体に
照射して記録を行なう方式である。しかし、光変調方式
では、記録媒体上の記録情報を書換えるためには、書込
まれている記録の消去を行なった後に、新たな情報の記
録を行なう必要がある。したがって、メモリシステムと
しての記録速度が遅くなる欠点がある。記録速度を速く
するために、記録再生装置に消去用の光ヘッドを別に設
ける方法もあるが、この方法ではその装置コストが大幅
に上Ａする欠点がある。The optical modulation method is a method in which recording is performed by applying a constant recording bias magnetic field and irradiating a recording medium with a light beam modulated according to recording information. However, in the optical modulation method, in order to rewrite the recorded information on the recording medium, it is necessary to erase the written record and then record new information. Therefore, there is a drawback that the recording speed as a memory system is slow. In order to increase the recording speed, there is a method of separately providing an optical head for erasing in the recording/reproducing apparatus, but this method has the disadvantage that the cost of the apparatus increases significantly.
−刀、記録磁場変調方式は、記録媒体に一定の光ビーム
を照射すると共に、記録情報によって変調された記Ｑ磁
場を付与して記録を行なう方式である。The recording magnetic field modulation method is a method in which recording is performed by irradiating a recording medium with a constant light beam and applying a magnetic field modulated by recording information.
Ｃ発明が解決しようとする問題点〕
この記録磁場変調方式は、上述した欠点を有さないもの
の、記録速度を速くするためには、数百ガウスの強さを
持つ高周波の変調された記録磁場を印加する必要があり
、これを簡単な装置で実現することは困難であった。Problems to be Solved by the Invention] Although this recording magnetic field modulation method does not have the above-mentioned drawbacks, in order to increase the recording speed, it is necessary to use a high-frequency modulated recording magnetic field with a strength of several hundred Gauss. It was difficult to realize this with a simple device.
本発明は上述の問題点に鑑みなされたものであり、高速
記録可能な記録磁場変調方式の記録装置を提供すること
にある。The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a recording device using a recording magnetic field modulation method that is capable of high-speed recording.
本発明の記録装置は、光磁気記録媒体からなるディスク
に、一定の光ビームを照射すると共に、記録情報によっ
て記録磁場を変調して前記ディスクに記録する記録装置
において、少なくとも、移動自在なｊｔη記記録磁場の
発生部と、該発生部に装着される操作用のコイルと、該
操作用コイルの近くに固設される磁石と、を備えている
ことを特徴とする。The recording device of the present invention is a recording device that irradiates a disk made of a magneto-optical recording medium with a constant light beam and modulates a recording magnetic field according to recording information to record on the disk. It is characterized by comprising a recording magnetic field generating section, an operating coil attached to the generating section, and a magnet fixedly installed near the operating coil.
したがって、情報の記録を行なう際に、上記、記録磁場
の発生部を、上記光磁気記録媒体であるディスクの面振
れに追従すべく、フォーカスサーボ信号より導かれる信
号を利用して、駆動することができる。Therefore, when recording information, the recording magnetic field generating section is driven using a signal derived from a focus servo signal in order to follow the surface runout of the disk, which is the magneto-optical recording medium. Can be done.
以下に本発明を、その実施例について図面を参照して説
明する。Embodiments of the present invention will be described below with reference to the drawings.
第１図は、本発明による一実施例を示す概略的な正面図
、第２図は同上に使用される概略的なブロック回路図、
第３図は第１図の説明図である。FIG. 1 is a schematic front view showing an embodiment according to the present invention, FIG. 2 is a schematic block circuit diagram used in the same,
FIG. 3 is an explanatory diagram of FIG. 1.
第１図の中央の光磁気記録媒体であるディスク１０は、
図示路の駆動装置で回転される。なお、ディスク１０は
、第３図に示される如く、透明な基板層１０１の下面に
記録層１０２を有し、該記録層１０２の下面に保護層１
０３を有している。なお、光ビームは基板層１０１側か
ら照射される。The disk 10, which is a magneto-optical recording medium in the center of FIG.
It is rotated by a drive device in the illustrated path. As shown in FIG. 3, the disc 10 has a recording layer 102 on the lower surface of a transparent substrate layer 101, and a protective layer 1 on the lower surface of the recording layer 102.
It has 03. Note that the light beam is irradiated from the substrate layer 101 side.
ディスク１０の上方に、昇降自在に配設されているのは
対物レンズｌｌａで、該対物レンズは光ビームｌｌｂを
ディスク１０の上面に収束する。５はアクチェータ用の
コイルで、対物レンズｌｌａに巻装され、近くに固定さ
れた磁石１１に作用して、対物レノズｌｌａを昇降する
。An objective lens lla is disposed above the disk 10 so as to be movable up and down, and the objective lens converges a light beam llb onto the upper surface of the disk 10. Reference numeral 5 denotes an actuator coil, which is wound around the objective lens lla and acts on a magnet 11 fixed nearby to raise and lower the objective lens lla.
ディスク１０の下方に、昇降自在に配設されているのは
磁場の発生部を構成するコア９で、該コアの上部には、
記録用の変調信号９ａが印加されるコ・イル９ｂが巻回
され、コア９の下部にはコア操作用のコイル８が巻装さ
れており、該コイル８は近くに固定された磁石１２に作
用して、磁場発生部のコア９を昇降する。A core 9 constituting a magnetic field generating section is arranged below the disk 10 so as to be able to rise and fall freely, and on the upper part of the core,
A coil 9b to which a recording modulation signal 9a is applied is wound, and a coil 8 for core operation is wound around the lower part of the core 9, and the coil 8 is connected to a magnet 12 fixed nearby. As a result, the core 9 of the magnetic field generating section is moved up and down.
第２図の上方は、フォーカスサーボ方式の一要部を示す
ブロック回路図で、１対の光検出用のセンサｌａ、ｌｂ
と、差動アンプ２と、補償回路３と、駆動アンプ４と
、アクチェータ用のコイル５とからなる。The upper part of FIG. 2 is a block circuit diagram showing a main part of the focus servo system, in which a pair of light detection sensors la and lb are shown.
, a differential amplifier 2, a compensation circuit 3, a drive amplifier 4, and an actuator coil 5.
１対の光検出用センサｌａ、 ｌｂは、ディスク１０
からの反射光（図示路）を受光して、対物レンズｌｌａ
とディスク１０との距離が正規の値のときは、両方のセ
ンサ１ ａ、 １ ｂより等しい検出出力が得られて、
差動アンプ２の出力はゼロとなり、上記の距離が正規の
値よりずれたときは、そのずれに応じて上記反射光の光
路が変わり、センサｌａ。A pair of light detection sensors la and lb are connected to the disk 10.
The objective lens lla receives the reflected light (path shown) from the
When the distance between the sensor 1a and the disk 10 is a normal value, equal detection outputs are obtained from both sensors 1a and 1b,
The output of the differential amplifier 2 becomes zero, and when the distance mentioned above deviates from the normal value, the optical path of the reflected light changes according to the deviation, and the optical path of the reflected light changes to the sensor la.
１ｂのうち、いずれか一方の受光光量が増すと共に、他
方の受光光量が減少するので、光検出用センサｌａ、
ｌｂの検出出力は、ずれ方向に応じて所定の一方の方
が大となり、またずれ量に応じて雨検出出力の差が変化
することになる。As the amount of light received by one of the sensors 1b increases, the amount of light received by the other one decreases, so the light detection sensor la,
The detection output of lb is larger in one predetermined direction depending on the shift direction, and the difference in the rain detection output changes depending on the shift amount.
光検出用センサ１ ａ、 １ ｂの各検出出力信号は。The detection output signals of the photodetection sensors 1a and 1b are as follows.
差動アンプ２により差動増幅されて、前記距離の誤差を
示す電圧に変換された後、補償回路３により位相が補償
され、更に、駆動アンプ４を経て、アクチェータ用のコ
イル５に供給される。After being differentially amplified by a differential amplifier 2 and converted into a voltage indicating the error in the distance, the phase is compensated by a compensation circuit 3, and further, the voltage is supplied to an actuator coil 5 via a drive amplifier 4. .
これによりアクチェータ用コイル５は、対物レンズｌｌ
ａとディスク１０との間の距離を、ディスク１０の面振
れにもかかわらず、常に一定とすべく、この面振れに応
じて対物レンズｌｌａをディスク１０面に対し、垂直方
向（第２図中の矢印方向）に変位させ、対物レンズｌｌ
ａを通過する光ビームｌｌｂを、ディスク１０面上に集
束させることができる。As a result, the actuator coil 5 is connected to the objective lens ll.
In order to keep the distance between a and the disk 10 constant regardless of the surface wobbling of the disk 10, the objective lens lla is moved in the direction perpendicular to the surface of the disk 10 (in Fig. 2) according to this surface wobbling. ), and move the objective lens ll
The light beam llb passing through a can be focused onto the surface of the disk 10.
第２図の下方は、本発明による実施例の要部を示すブロ
ック回路図で、図中の６は、差動アンプ２からの信号の
位相を補償するための補償回路であり、７は駆動アンプ
、８は磁場発生部操作用のコイルである。The lower part of FIG. 2 is a block circuit diagram showing the main part of the embodiment according to the present invention. In the figure, 6 is a compensation circuit for compensating the phase of the signal from the differential amplifier 2, and 7 is a drive circuit. The amplifier 8 is a coil for operating the magnetic field generator.
これにより、上述と同様に、磁場発生部のコア９とディ
スク１０との間の距離を、ディスク１０の面振れにもか
かわらず、常に一定とすべく、この面振れに応じて、磁
場発生部のコア９をディスク１０面に対して、垂直方向
（第２図中の矢印方向）に変位させることができる。As a result, as described above, in order to keep the distance between the core 9 of the magnetic field generating section and the disk 10 constant regardless of the surface runout of the disk 10, the magnetic field generating section The core 9 can be displaced in the direction perpendicular to the surface of the disk 10 (in the direction of the arrow in FIG. 2).
具体的には、ディスク１０と磁場発生部のコア９とのギ
ャップを、面振れがあっても常に１００〜２００−に保
つことができ、土１００ガウス程度の記録磁場で変調を
数ＭＨｚで行なうことができた。Specifically, the gap between the disk 10 and the core 9 of the magnetic field generating section can always be maintained at 100 to 200 - even if there is surface runout, and modulation can be performed at several MHz with a recording magnetic field of about 100 Gauss. I was able to do that.
なお、ディスク１０の光磁気記録媒体の構成は、前述に
限ることなく、片面基板であれば、記録層１０２と基板
層１０１との間、ならびに記録層１０２と保護層１０３
との間に、種々の層を増加しても良いことは勿論である
。Note that the structure of the magneto-optical recording medium of the disk 10 is not limited to the above-mentioned one, and if it is a single-sided substrate, the structure is between the recording layer 102 and the substrate layer 101, and between the recording layer 102 and the protective layer 103.
Of course, various layers may be added between the two.
また、記録磁場の発生部を、変調信号９ａ用のコイル９
ｂならびにコア９が構成すると共に、昇降自在なコア９
は、該記録磁場発生部を移動自在にする手段を構成して
いる。In addition, the recording magnetic field generation section is replaced by a coil 9 for the modulation signal 9a.
b and the core 9, and the core 9 is movable up and down.
constitutes means for making the recording magnetic field generating section movable.
以上説明したように本発明は、光磁気記録媒体に対して
記録バイアス磁場を変調し、光を照射して信号の記録を
行なう時に、記録バイアス磁場発生部のコアを光磁気記
録媒体のディスクに対して１００〜２００μｓのギャッ
プで配性し、かつ、上記の記録バイアス磁場発生部のコ
アを、フォーカヌサーポ信号を利用して、前記ディスク
に面振れ等があっても、常に１００〜２００−のギャッ
プを保つようにできるため、記録磁場変調方式において
、高速化が可能となる効果がある。As explained above, the present invention modulates the recording bias magnetic field on the magneto-optical recording medium, and when recording a signal by irradiating light, the core of the recording bias magnetic field generating section is directed to the disk of the magneto-optical recording medium. The core of the recording bias magnetic field generating section is aligned with a gap of 100 to 200 μs, and the core of the recording bias magnetic field generating section is always maintained with a gap of 100 to 200 μs even if there is surface runout on the disk using the focal support signal. This has the effect of making it possible to increase the speed of the recording magnetic field modulation method.
なお、本発明による実験ではディスクに対して、１００
〜２００ＩＩｊのギャップがあれば、 １００ガウス程
度の低磁場でも、１８００ｒｐｍ 、パワー５．５ｍ臀
で記録が可能で、かつ＠３Ｈｚ程度の変調が可能であっ
た。In addition, in the experiment according to the present invention, 100
With a gap of ~200IIj, even in a low magnetic field of about 100 Gauss, recording was possible at 1800 rpm and power of 5.5m, and modulation of about @3Hz was possible.
第１図は、本発明による一実施例を示す概略的な正面図
、第２図は同上の概略的なブロック回路図、第３図は第
１図の説明図である。
８・・・操作用コイル、
９・・・コア。
９ｂ・・・変調信号用コイル、
１０・・・光磁気記録媒体のディスク、１１ｂ・・・光
ビーム、
１２・・・磁石。FIG. 1 is a schematic front view showing one embodiment of the present invention, FIG. 2 is a schematic block circuit diagram of the same, and FIG. 3 is an explanatory diagram of FIG. 1. 8...Operating coil, 9...Core. 9b... Coil for modulation signal, 10... Disk of magneto-optical recording medium, 11b... Light beam, 12... Magnet.
Claims (1)
照射すると共に、記録情報によって記録磁場を変調して
前記ディスクに記録する記録装置において、少なくとも
、 移動自在な前記記録磁場の発生部と、 該発生部に装着される操作用のコイルと、 該操作用コイルの近くに固設される磁石と、を備えてい
ることを特徴とする光磁気記録媒体の記録装置。[Scope of Claims] A recording apparatus that irradiates a disk made of a magneto-optical recording medium with a constant light beam and modulates a recording magnetic field according to recording information to record on the disk, at least the recording magnetic field is movable. 1. A recording device for a magneto-optical recording medium, comprising: a generating section; an operating coil attached to the generating section; and a magnet fixedly installed near the operating coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19815086A JPS6355746A (en) | 1986-08-26 | 1986-08-26 | Recording device for magneto-optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19815086A JPS6355746A (en) | 1986-08-26 | 1986-08-26 | Recording device for magneto-optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6355746A true JPS6355746A (en) | 1988-03-10 |
Family
ID=16386290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19815086A Pending JPS6355746A (en) | 1986-08-26 | 1986-08-26 | Recording device for magneto-optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6355746A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5157641A (en) * | 1989-06-02 | 1992-10-20 | Thomson-Csf | Apparatus for generating a magnetic biasing field for recording in a magneto-optical recording medium |
| US5321686A (en) * | 1992-02-27 | 1994-06-14 | Pioneer Electronic Corporation | Read-write head of an magneto-optical disc player with both heads magnetically coupled together |
-
1986
- 1986-08-26 JP JP19815086A patent/JPS6355746A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5157641A (en) * | 1989-06-02 | 1992-10-20 | Thomson-Csf | Apparatus for generating a magnetic biasing field for recording in a magneto-optical recording medium |
| US5321686A (en) * | 1992-02-27 | 1994-06-14 | Pioneer Electronic Corporation | Read-write head of an magneto-optical disc player with both heads magnetically coupled together |
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