JP2619373B2 - Magneto-optical disk drive - Google Patents
Magneto-optical disk driveInfo
- Publication number
- JP2619373B2 JP2619373B2 JP61306424A JP30642486A JP2619373B2 JP 2619373 B2 JP2619373 B2 JP 2619373B2 JP 61306424 A JP61306424 A JP 61306424A JP 30642486 A JP30642486 A JP 30642486A JP 2619373 B2 JP2619373 B2 JP 2619373B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- polarity
- magneto
- optical disk
- external magnetic
- 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
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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光磁気デイスク装置に係り、特に安定に記録
あるいは消去を行なうことのできる外部磁場印加方式に
関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk device, and more particularly to an external magnetic field applying method capable of performing stable recording or erasing.
従来、光磁気デイスク装置の外部磁場印加方式につい
ては、特開昭57-186209号に記載のように電磁コイルを
用いる方法あるいは特開昭59-54003号記載のように永久
磁石を回転させる方法があつた。しかし、いずれの方法
もデイスク上の記録膜に印加される外部磁場の極性をチ
エツクし、誤記録や誤消去を防止するという点について
は配慮されていなかつた。Conventionally, as for an external magnetic field applying method of a magneto-optical disc device, a method using an electromagnetic coil as described in JP-A-57-186209 or a method of rotating a permanent magnet as described in JP-A-59-54003 is known. Atsuta. However, none of these methods takes care of checking the polarity of the external magnetic field applied to the recording film on the disk to prevent erroneous recording or erasure.
従つて上記従来方法では、情報の記録および消去時に
印加する外部磁場の極性に誤りが生じ、誤記録あるいは
誤消去が発生するという問題がある。Therefore, in the above-described conventional method, there is a problem that the polarity of the external magnetic field applied at the time of recording and erasing information is erroneous, and erroneous recording or erasing occurs.
本発明の目的は、上記のような外部磁場の極性誤りを
なくし、安定に記録あるいは消去を行なうことのできる
外部磁場印加方式を提供することにある。It is an object of the present invention to provide an external magnetic field application system capable of eliminating the above-described polarity error of the external magnetic field and performing stable recording or erasing.
特に外部磁場の極性の誤りは、外部磁場印加手段とし
て永久磁石を用いた場合に深刻である。電磁石を用いる
場合には電磁石の駆動電流で磁場の極性が確認でき、ま
たリアルタイムで極性の制御ができるが、永久磁石の磁
極の向きを機械的に切替えて極性を切替える方式では、
磁場の極性を示す電気信号が得られないため、極性の誤
りに気付かないまま記録、消去動作を行ない、誤記録、
誤消去を行なう可能性が大きいためである。In particular, an error in the polarity of the external magnetic field is serious when a permanent magnet is used as the external magnetic field applying means. When using an electromagnet, the polarity of the magnetic field can be confirmed by the driving current of the electromagnet, and the polarity can be controlled in real time.However, in the method of switching the polarity by mechanically switching the direction of the magnetic pole of the permanent magnet,
Since an electrical signal indicating the polarity of the magnetic field cannot be obtained, recording and erasing operations are performed without noticing the polarity error,
This is because the possibility of erroneous erasure is large.
［問題点を解決するための手段］ 上記目的は、情報の記録あるいは消去に応じて光磁気
媒体上の記録膜に印加する磁場の極性を切替え、情報の
記録あるいは消去を行なうに際し、記録膜に印加された
磁場の極性が適正か否かをチエツクし、記録あるいは消
去動作を実行するか否かを判断することによって達成さ
れる。この場合磁場の極性のみを検出すれば目的は達成
される。検出する手段としては例えばホール素子等が好
適である。[Means for Solving the Problems] The object of the present invention is to switch the polarity of a magnetic field applied to a recording film on a magneto-optical medium in accordance with recording or erasing of information, and to perform recording or erasing of information. This is achieved by checking whether the polarity of the applied magnetic field is appropriate or not, and determining whether to perform a recording or erasing operation. In this case, the object is achieved by detecting only the polarity of the magnetic field. As a detecting means, for example, a Hall element or the like is suitable.
磁場の極性が適正でない場合には、記録膜に印加する
磁場の極性を反転させた後、記録あるいは消去動作を実
行する。磁場の極性の切替は、例えば永久磁石を機械的
に運動させることによって実現できる。If the polarity of the magnetic field is not appropriate, the polarity of the magnetic field applied to the recording film is reversed, and then the recording or erasing operation is performed. Switching of the polarity of the magnetic field can be realized by, for example, mechanically moving a permanent magnet.
また、磁場の極性反転回数を計数し、所定数を超えた
場合、装置に異常があったと判断して記録あるいは消去
動作を停止してもよい。Alternatively, the number of polarity reversals of the magnetic field may be counted, and if the number exceeds a predetermined number, the recording or erasing operation may be stopped by judging that there is an abnormality in the apparatus.
この外部磁場検出手段によつて、デイスク上の記録膜
に印加される外部磁場の極性をチエツクする。それによ
つて、情報の記録および消去時には各々適正な極性で外
部磁場を印加することができる。The polarity of the external magnetic field applied to the recording film on the disk is checked by the external magnetic field detecting means. Thus, when recording and erasing information, an external magnetic field can be applied with an appropriate polarity.
以下、本発明の一実施例を第１図により説明する。 Hereinafter, an embodiment of the present invention will be described with reference to FIG.
記録および消去の命令は上位のコントローラ１よりコ
ントローラ２に入る。外部磁場印加手段３の極性切り換
えは該コントローラ２よりの信号によつて行なわれる。
一方外部磁場極性検出手段４で検出された磁場極性の信
号は極性判定回路５に入る。ここで、検出された磁場極
性が適正であると判断された場合、コントローラ２はレ
ーザ駆動回路６に信号を送り、記録および消去に対応し
た所定の出力およびパルス幅でレーザ701を発光させ
る。磁場極性が適正でない場合、コントローラ２はレー
ザ駆動回路６に信号を送らず、レーザ701は記録および
消去に対応した発光動作は行なわない。この時コントロ
ーラ２は、外部磁場印加手段３に対して再度磁場極性反
転動作を指令し、磁場極性を適性な極性としてからレー
ザ駆動回路６を動作させる。The recording and erasing commands enter the controller 2 from the upper controller 1. The polarity of the external magnetic field applying means 3 is switched by a signal from the controller 2.
On the other hand, the signal of the magnetic field polarity detected by the external magnetic field polarity detection means 4 enters the polarity determination circuit 5. Here, if it is determined that the detected magnetic field polarity is appropriate, the controller 2 sends a signal to the laser drive circuit 6 to cause the laser 701 to emit light with a predetermined output and pulse width corresponding to recording and erasing. If the magnetic field polarity is not appropriate, the controller 2 does not send a signal to the laser drive circuit 6, and the laser 701 does not perform a light emission operation corresponding to recording and erasing. At this time, the controller 2 again instructs the external magnetic field applying means 3 to perform a magnetic field polarity reversing operation, and then operates the laser driving circuit 6 after setting the magnetic field polarity to an appropriate polarity.
コントローラ３にはまた計数回路９が接続されてお
り、コントローラが極性反転を指令した回数が計数され
ている。ここで、極性反転指令の回数が所定の回数を越
えても適正極性の磁場が得られなかつた場合、コントロ
ーラ２は、装置にエラーが発生したと判断してその旨上
位のコントローラ１へ信号を送り、記録および消去動作
を停止させる。上述した所定の回数は、上位のコントロ
ーラ１から送られる場合やあらかじめROM等によつて内
蔵されている場合等いろいろ考えられる。The controller 3 is also connected to a counting circuit 9 which counts the number of times the controller instructs polarity reversal. Here, if a magnetic field of an appropriate polarity cannot be obtained even if the number of polarity inversion commands exceeds a predetermined number, the controller 2 determines that an error has occurred in the device and sends a signal to the controller 1 to that effect. Feed, stop recording and erasing operations. The predetermined number of times described above may be variously considered, such as a case where the number is sent from the host controller 1 or a case where the number is previously stored in a ROM or the like.
本実施例では、外部磁場検出手段４をデイスク８を挾
んで光ヘツド７と対向させて配置したが、第１図（ｂ）
のように光ヘツド７と同じ側に配置してもよい。また外
部磁場印加手段３も、デイスク８に対して光ヘツド７と
同じ側に配置してよいことは言うまでもない。In the present embodiment, the external magnetic field detecting means 4 is arranged so as to face the optical head 7 with the disk 8 interposed therebetween.
May be arranged on the same side as the optical head 7 as shown in FIG. Needless to say, the external magnetic field applying means 3 may be arranged on the same side of the disk 8 as the optical head 7.
外部磁場検出手段としては例えばホール素子等が好適
である。As the external magnetic field detecting means, for example, a Hall element or the like is suitable.
外部磁場印加手段としては、電磁コイル，永久磁石等
種々考えられるがいずれを用いてもかまわない。第２図
に一例を示す。これは６個の極をもつ永久磁石10を固定
電極コイル11a〜11dによつて回転させることによつてデ
イスク８上に印加される外部磁場の極性を切り換えるも
のである。外部磁場検出手段は4a,4b,4c,いずれの位置
に配置してもかまわない。As the external magnetic field applying means, various types such as an electromagnetic coil and a permanent magnet can be considered, but any of them may be used. FIG. 2 shows an example. This is to switch the polarity of the external magnetic field applied on the disk 8 by rotating the permanent magnet 10 having six poles by the fixed electrode coils 11a to 11d. The external magnetic field detecting means may be arranged at any position of 4a, 4b, 4c.
外部磁場印加手段として電磁コイルを用いた場合、外
部磁場検出手段によつて極性だけでなく磁場強度をも検
出し、電源電圧変動や発熱による電磁コイルの抵抗等の
変動で生じる磁場強度のゆらぎを補正することもでき
る。When an electromagnetic coil is used as the external magnetic field applying means, not only the polarity but also the magnetic field strength is detected by the external magnetic field detecting means, and fluctuations in the magnetic field strength caused by fluctuations in the power supply voltage or fluctuations in the resistance of the electromagnetic coil due to heat are detected. It can also be corrected.
本発明によれば、情報の記録あるいは消去時に適正な
方向に外部磁場が印加されるので、誤記録や誤消去が発
生せず、安定に記録，消去を行なうことができる。According to the present invention, since an external magnetic field is applied in an appropriate direction when recording or erasing information, erroneous recording or erasure does not occur and recording and erasing can be performed stably.
第１図は本発明の一実施例を示す図、第２図は具体的な
外部磁場印加手段を示す図である。 １……上位コントローラ、２……コントローラ、３……
外部磁場印加手段、４……磁場極性検出手段、５……極
性判定回路、６……レーザ駆動回路、７……光ヘツド、
701……レーザ、８……デイスク、801……記録膜、９…
…計数回路、10……永久磁石、11a〜11d……電磁コイ
ル。FIG. 1 is a view showing an embodiment of the present invention, and FIG. 2 is a view showing specific external magnetic field applying means. 1 ... upper controller, 2 ... controller, 3 ...
External magnetic field applying means, 4 ... magnetic field polarity detecting means, 5 ... polarity determining circuit, 6 ... laser driving circuit, 7 ... optical head,
701 laser, 8 disk, 801 recording film, 9
… Counter circuit, 10… Permanent magnets, 11a-11d …… Electromagnetic coils.
Claims (3)
印加手段と、上記光磁気ディスクにレーザを照射する光
ヘッドと、上記外部磁場印加手段及び光ヘッドを制御し
て上記光磁気ディスクに所定極性の磁場を印加するとと
もにレーザを照射して情報の記録または消去を行う光磁
気ディスク装置において、回転可能な複数の極を持つ永
久磁石とその周りに配置された複数の電磁コイルを有
し、上記電磁コイルによって上記永久磁石を回転させる
ことにより上記永久磁石の極性を変えることのできる外
部磁場印加手段と、上記光磁気ディスクに印加される磁
場の極性を検出する外部磁場極性検出手段と、該検出さ
れた磁場の極性が適正であるかどうか判断する極性判定
回路を有し、上記極性判定回路が磁場の極性が適正と判
断したときのみ上記光ヘッドにレーザの照射を指令する
コントローラを有することを特徴とする光磁気ディスク
装置。An external magnetic field applying means for applying a magnetic field to the magneto-optical disk; an optical head for irradiating the magneto-optical disk with a laser; In a magneto-optical disk device that applies a magnetic field of a polarity and irradiates a laser to record or erase information, a permanent magnet having a plurality of rotatable poles and a plurality of electromagnetic coils arranged therearound, External magnetic field applying means for changing the polarity of the permanent magnet by rotating the permanent magnet by the electromagnetic coil, external magnetic field polarity detecting means for detecting the polarity of the magnetic field applied to the magneto-optical disk, A polarity judgment circuit for judging whether the polarity of the detected magnetic field is appropriate or not, and only when the polarity judgment circuit judges that the polarity of the magnetic field is appropriate, Magneto-optical disk apparatus characterized by comprising a controller for commanding the laser irradiation head.
場の極性が適正でないと判断したとき、前記外部磁場印
加手段に磁場極性の反転を指令することを特徴とする特
許請求の範囲第１項記載の光磁気ディスク装置。2. The controller according to claim 1, wherein when the polarity judgment circuit judges that the polarity of the magnetic field is not proper, the controller instructs the external magnetic field applying means to invert the polarity of the magnetic field. Magneto-optical disk device.
を超えた場合、記録あるいは消去動作を停止することを
特徴とする特許請求の範囲第２項記載の光磁気ディスク
装置。3. The magneto-optical disk drive according to claim 2, wherein the number of polarity reversals of the magnetic field is counted, and when the number exceeds a predetermined number, the recording or erasing operation is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61306424A JP2619373B2 (en) | 1986-12-24 | 1986-12-24 | Magneto-optical disk drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61306424A JP2619373B2 (en) | 1986-12-24 | 1986-12-24 | Magneto-optical disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63160002A JPS63160002A (en) | 1988-07-02 |
| JP2619373B2 true JP2619373B2 (en) | 1997-06-11 |
Family
ID=17956853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61306424A Expired - Lifetime JP2619373B2 (en) | 1986-12-24 | 1986-12-24 | Magneto-optical disk drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2619373B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2682621B2 (en) * | 1987-03-03 | 1997-11-26 | オリンパス光学工業株式会社 | Bias magnetic field abnormality detector |
| JPH0272402U (en) * | 1988-11-16 | 1990-06-01 | ||
| JPH0276331U (en) * | 1988-11-25 | 1990-06-12 | ||
| JPH0792890B2 (en) * | 1991-09-06 | 1995-10-09 | ソニー株式会社 | Magnetic field application device for recordable optical disk |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57176505A (en) * | 1981-04-23 | 1982-10-29 | Olympus Optical Co Ltd | Bias magnetic field applying system |
-
1986
- 1986-12-24 JP JP61306424A patent/JP2619373B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63160002A (en) | 1988-07-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |