JPS63177304A - External magnetic field impressing device for magneto-optical information recorder - Google Patents
External magnetic field impressing device for magneto-optical information recorderInfo
- Publication number
- JPS63177304A JPS63177304A JP842487A JP842487A JPS63177304A JP S63177304 A JPS63177304 A JP S63177304A JP 842487 A JP842487 A JP 842487A JP 842487 A JP842487 A JP 842487A JP S63177304 A JPS63177304 A JP S63177304A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- external magnetic
- medium
- recording medium
- electromagnet
- 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 6
- 238000001514 detection method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 230000010287 polarization Effects 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
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、磁気光学効果を利用した光ａ気情報記録装置
！！（おける外ｓ轍界叩加装置に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is an optical aero-information recording device that utilizes the magneto-optical effect! ! (Regarding the outside rut field hitting device.
（ロ）従来の技術
磁気光学効果を利用した情報記録再生装置では、ＴｂＦ
ｅＣｏ ％の市士＠−遷移金属台金＃膜が形成されたデ
ィスク状記録媒体に外部磁界を加え、レーザ光を照射す
ることにより情報の記録及び消去動作が行なわれる。舛
生制作は、ディスク状記録媒体からのレーデ反射光の偏
光面の回転を検出することによって為される。(b) Conventional technology In information recording and reproducing devices using magneto-optic effects, TbF
Information is recorded and erased by applying an external magnetic field to the disk-shaped recording medium on which the eCo % Ichishi@-transition metal base metal film is irradiated with laser light. The image processing is performed by detecting the rotation of the polarization plane of the Radhe reflected light from the disk-shaped recording medium.
記録、消去時に外部磁界をディスク状記録媒体に印加す
る手段としては、特開昭５７−１１７１０６号公嵐（Ｇ
１１Ｂ５１０２）に示された様に電磁石を利用するもの
や、永久磁石を利用する構成がある。A means for applying an external magnetic field to a disk-shaped recording medium during recording and erasing is disclosed in Japanese Patent Application Laid-Open No. 57-117106 (G.
11B5102), there are configurations that use electromagnets and permanent magnets.
ところが、これらの外Ｓ磁界発生源は回転するディスク
状記録媒体に対して、固定して設けられているため、デ
ィスク状記録媒体の（３）振れにより、外部磁界発生源
とディスク状記録媒体との距離が絶えず質重し、印加さ
れる磁場の強さが一定にならないという問題が生じる。However, since these external S magnetic field generation sources are fixedly provided with respect to the rotating disk-shaped recording medium, due to (3) vibration of the disk-shaped recording medium, the external magnetic field generation source and the disk-shaped recording medium may A problem arises in that the distance between the two ends of the magnetic field changes constantly, and the strength of the applied magnetic field is not constant.
Ｈ発明が解決しようとする問題点
すなわち、従来の外部磁界印加装置では、回転するディ
スク状記録媒体の面振れにより、この媒体に印加される
磁場の強度が一定とならず、情報の記録及び消去前作が
安定して行なわれないおそれがある。The problem to be solved by the H invention is that in the conventional external magnetic field applying device, the intensity of the magnetic field applied to the rotating disk-shaped recording medium is not constant due to the surface runout of the medium, making it difficult to record and erase information. There is a risk that the previous work will not be performed stably.
に）間■点を解決するための手段
本発明は、外部磁界発生源による媒体への印加磁場の強
さを制御する制御手段を設け、この外部磁界発生源と媒
体との距離に応じて前記印加磁場の強さを制御するもの
である。The present invention provides a control means for controlling the strength of the magnetic field applied to the medium by the external magnetic field source, and adjusts the intensity of the magnetic field according to the distance between the external magnetic field source and the medium. It controls the strength of the applied magnetic field.
（ホ）作 用
従って、媒体がディスク状記録媒体の場合、ディスク状
記録媒体のｉｋｉ振れがあっても、印加磁場の強さを一
定に制御できるので、情報の記録、消去動作が安定とな
る。(E) Function Therefore, when the medium is a disk-shaped recording medium, even if there is a fluctuation of the disk-shaped recording medium, the strength of the applied magnetic field can be controlled to a constant level, so information recording and erasing operations are stable. .
（へ）実施例 以下、図面に従い本発明の実施例について、説明する。(f) Example Embodiments of the present invention will be described below with reference to the drawings.
図は実施例の要部を示すブロック図である。The figure is a block diagram showing the main parts of the embodiment.
図において、（１）は外部磁界発生源であるｗ／Ｌ磁石
、（２）は、ディスク状記録媒体、（３）は電磁石（１
）をディスク状記録媒体（２）の回転軸と平行な方向に
移動せしめる移動手吹であるボイスコイル型アクチュエ
ータ、（１２１はフォーカスエラー信号の入力端子、Ｃ
４）は位相補償回路、１５）はゲイン・バイアス調整回
路、（６）はボイスコイル型アクチュエータ（３）の駆
動回路である。In the figure, (1) is a w/L magnet that is an external magnetic field generation source, (2) is a disk-shaped recording medium, and (3) is an electromagnet (1
) in a direction parallel to the rotation axis of the disk-shaped recording medium (2), a voice coil type actuator (121 is a focus error signal input terminal, C
4) is a phase compensation circuit, 15) is a gain/bias adjustment circuit, and (6) is a drive circuit for the voice coil type actuator (3).
１７）は光学ヘッドの対物レンズ、（８）はこの対物レ
ンズの部側用アクチュエータ、 ＋９１ｔｌＯｔｌｌ）
ｔ−１夫々、対物レンズ＋７１の駆！ＩＩＪ糸の位相補
償回路、ゲイン・ノくイアス調整回路、駆動回路である
。17) is the objective lens of the optical head, (8) is the actuator for the side of this objective lens, +91tlOtll)
Each t-1, objective lens +71 drive! These are the IIJ thread phase compensation circuit, gain/earth adjustment circuit, and drive circuit.
電磁石（１）の端子ｕ３１には、磁界発生用の電源が接
続される。A power source for generating a magnetic field is connected to the terminal u31 of the electromagnet (1).
フォーカスエラー信号は、本来対物レンズ＋７）の位置
を制御するために作成されるものであり、光学ヘッドか
らディスク状記録媒体（２）に集光照射されたレーザ光
のディスク記録媒体（２）からの反射光に基づき、周知
の手段ズ作成される。The focus error signal is originally created to control the position of the objective lens +7), and is generated by the laser beam from the disk recording medium (2) that is focused and irradiated from the optical head onto the disk-shaped recording medium (2). Based on the reflected light of , well-known means are created.
つまり、フォーカスエラー信号は、対物レンズある。そ
こで対物レンズ１７ｊの動きとは、逆の方向に、電磁石
（１）が駆動される様Ｋ、電磁石アクチュエータ（３）
の制御系を構成する必要がある。In other words, the focus error signal is from the objective lens. Therefore, the electromagnet actuator (3) is moved so that the electromagnet (1) is driven in the direction opposite to the movement of the objective lens 17j.
It is necessary to configure a control system for the
もちろん、外部磁界発生源としては、永久磁石型式を用
いることもできる。Of course, a permanent magnet type can also be used as the external magnetic field source.
又、″電磁石を外部磁界発生源として用いる場合、ディ
スク状記録媒体（２）の而ぶれに対して、磁場の強さを
一定に制御する他の手段として、フォーカスエラー信号
に基づき！磁石（１）の電源の出力電流を制御する構成
も考えられる。In addition, when an electromagnet is used as an external magnetic field generation source, as another means of controlling the strength of the magnetic field to a constant level against the fluctuation of the disk-shaped recording medium (2), it is possible to use an electromagnet (1) based on the focus error signal. ) is also conceivable.
上記実施例では光学ヘッドの対物レンズのフォーカスエ
ラー信号を利用して磁場の強さを一定に制御しているが
、別途、外部磁界発生源とディスク状記録媒体との闇の
距離を測定する手段を設けよい。In the above embodiment, the strength of the magnetic field is controlled to be constant using the focus error signal of the objective lens of the optical head, but a separate means is provided to measure the distance between the external magnetic field source and the disk-shaped recording medium. may be established.
（ト）発明の効果
以上述べた様に、本発明によれば、外部磁界発生源を用
いる光磁気情報記録装置において、記録媒体と外部磁界
発生源との距離の変動に対して、記録媒体での磁場の強
度を一定に制御できるので、記録、消去動作を安定して
行なうことができ、効果がある。(G) Effects of the Invention As described above, according to the present invention, in a magneto-optical information recording device using an external magnetic field generation source, the recording medium can respond to changes in the distance between the recording medium and the external magnetic field generation source. Since the strength of the magnetic field can be controlled to a constant value, recording and erasing operations can be performed stably, which is effective.
図は本発明の実施例を示すブロック図である。
（１）・・・外部磁界発生＃（電磁石）、（２）・・・
ディスク状記録媒体、（３）・・・電磁石アクチュエー
タ、じ・・・フォーカスエラー信号入力端子。The figure is a block diagram showing an embodiment of the present invention. (1)... External magnetic field generation # (electromagnet), (2)...
Disc-shaped recording medium, (3)... Electromagnetic actuator, (3)... Focus error signal input terminal.
Claims (1)
検出する検出手段と、前記距離の変動に応じて、前記記
録媒体での磁場の強度を一定に制御する制御手段を備え
る光磁気情報記録装置の外部磁界印加装置。(1) An optical beam comprising a detection means for detecting a change in the distance between an external magnetic field generation source and a recording medium, and a control means for controlling the strength of the magnetic field at the recording medium to a constant level according to the change in the distance. External magnetic field application device for magnetic information recording device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP842487A JPS63177304A (en) | 1987-01-16 | 1987-01-16 | External magnetic field impressing device for magneto-optical information recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP842487A JPS63177304A (en) | 1987-01-16 | 1987-01-16 | External magnetic field impressing device for magneto-optical information recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63177304A true JPS63177304A (en) | 1988-07-21 |
Family
ID=11692745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP842487A Pending JPS63177304A (en) | 1987-01-16 | 1987-01-16 | External magnetic field impressing device for magneto-optical information recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63177304A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL9001725A (en) * | 1989-08-01 | 1991-03-01 | Mitsubishi Electric Corp | METHOD AND APPARATUS FOR RECORDING INFORMATION ON A MAGNETO-OPTICAL INFORMATION RECORDING MEDIUM. |
| US5163032A (en) * | 1988-06-07 | 1992-11-10 | U.S. Philips Corp. | Magneto-optical recorder with servo control system for a magnetic-field modulation system |
| US5179544A (en) * | 1989-03-28 | 1993-01-12 | U.S. Philips Corporation | Control system for the magnetic head of a magneto-optical disc apparatus |
| US5191562A (en) * | 1990-07-06 | 1993-03-02 | U.S. Philips Corporation | Positioning system for the heads of a magneto-optical data recorder |
| JPH0590620U (en) * | 1991-10-24 | 1993-12-10 | 日本電気ホームエレクトロニクス株式会社 | Magneto-optical recording device |
| WO2004051640A1 (en) * | 2002-11-29 | 2004-06-17 | Fujitsu Limited | Magneto-optical storage medium reproduction method and magneto-optical storage apparatus using the method |
| KR100696235B1 (en) * | 2005-05-27 | 2007-03-21 | 후지쯔 가부시끼가이샤 | Magneto-optical storage medium reproduction method and megneto-optical storage apparatus using the method |
-
1987
- 1987-01-16 JP JP842487A patent/JPS63177304A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5163032A (en) * | 1988-06-07 | 1992-11-10 | U.S. Philips Corp. | Magneto-optical recorder with servo control system for a magnetic-field modulation system |
| US5179544A (en) * | 1989-03-28 | 1993-01-12 | U.S. Philips Corporation | Control system for the magnetic head of a magneto-optical disc apparatus |
| NL9001725A (en) * | 1989-08-01 | 1991-03-01 | Mitsubishi Electric Corp | METHOD AND APPARATUS FOR RECORDING INFORMATION ON A MAGNETO-OPTICAL INFORMATION RECORDING MEDIUM. |
| US5191562A (en) * | 1990-07-06 | 1993-03-02 | U.S. Philips Corporation | Positioning system for the heads of a magneto-optical data recorder |
| JPH0590620U (en) * | 1991-10-24 | 1993-12-10 | 日本電気ホームエレクトロニクス株式会社 | Magneto-optical recording device |
| WO2004051640A1 (en) * | 2002-11-29 | 2004-06-17 | Fujitsu Limited | Magneto-optical storage medium reproduction method and magneto-optical storage apparatus using the method |
| KR100696235B1 (en) * | 2005-05-27 | 2007-03-21 | 후지쯔 가부시끼가이샤 | Magneto-optical storage medium reproduction method and megneto-optical storage apparatus using the method |
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