JPH065561B2 - Magneto-optical recording device - Google Patents
Magneto-optical recording deviceInfo
- Publication number
- JPH065561B2 JPH065561B2 JP2993484A JP2993484A JPH065561B2 JP H065561 B2 JPH065561 B2 JP H065561B2 JP 2993484 A JP2993484 A JP 2993484A JP 2993484 A JP2993484 A JP 2993484A JP H065561 B2 JPH065561 B2 JP H065561B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- coil
- bias magnetic
- transistor
- disk
- 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
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 3
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910016629 MnBi Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 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
- G11B11/10502—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 characterised by the transducing operation to be executed
- G11B11/10517—Overwriting or erasing
-
- 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
- G11B11/10502—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 characterised by the transducing operation to be executed
- G11B11/10523—Initialising
-
- 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
- G11B11/10532—Heads
- G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
-
- 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
- G11B11/10595—Control of operating function
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】 発明の技術分野 本発明は、垂直な磁気異方性を有する磁性記録媒体を使
用した光磁気記録装置、特に記録、消去のために印加さ
れるバイアス磁界発生手段を有する光磁気記録装置に関
する。Description: TECHNICAL FIELD OF THE INVENTION The present invention has a magneto-optical recording device using a magnetic recording medium having perpendicular magnetic anisotropy, and in particular has a bias magnetic field generating means applied for recording and erasing. The present invention relates to a magneto-optical recording device.
従来技術の問題点 従来、垂直磁化式光磁気記録装置に用いられるバイアス
磁界の印加方式は、第１図に示すようにターンテーブル
１上に載置したデイスク２の裏面に移動式のバイアス磁
界印加用ヘッド３を設け、そのギャップに発生する漏洩
磁界をデイスク２の必要な部分に移動させてバイアス磁
界を与える方式や、第２図に示すようなデイスク２の外
周に大型のコイル４を設置し、デイスク２の全域にわた
つてバイアス磁界を加える方式が用いられている。しか
しながら、第１図の移動式ヘッドを用いる方式では、デ
イスク上の情報を記録や消去する位置に対応してヘッド
をデイスクの半径方向に移動させなければならないの
で、移動機構が複雑となり、光磁気記録装置の大型化を
まねく等の問題点を有している。Problems of Prior Art Conventionally, a bias magnetic field application method used in a perpendicular magnetization type magneto-optical recording apparatus is as shown in FIG. 1, in which a movable bias magnetic field is applied to the back surface of a disk 2 mounted on a turntable 1. A head 3 is provided and a leakage magnetic field generated in the gap is moved to a necessary portion of the disk 2 to provide a bias magnetic field, or a large coil 4 is installed on the outer circumference of the disk 2 as shown in FIG. , A system of applying a bias magnetic field over the entire area of the disk 2 is used. However, in the method using the movable head shown in FIG. 1, the head has to be moved in the radial direction of the disk corresponding to the position where information is recorded or erased on the disk, so that the moving mechanism becomes complicated and There are problems such as an increase in the size of the recording device.
一方、第２図の従来例では、上記の移動ヘッドを用いる
方式に比べて複雑な移動機構を要しない利点があるが、
デイスク２の外周に設けるコイルが大型化し、デイスク
への情報の記録又は消去に必要な磁界強度を得る為には
大きな電力を必要とし、コイルの発熱や、電源の大型化
をまねき、更に、一様な磁界強度が得にくいなど多くの
問題点を生じている。On the other hand, the conventional example shown in FIG. 2 has an advantage of not requiring a complicated moving mechanism as compared with the method using the moving head described above.
The coil provided on the outer periphery of the disk 2 becomes large in size, and a large amount of electric power is required to obtain the magnetic field strength required for recording or erasing information on the disk, leading to heat generation of the coil and an increase in size of the power supply. There are many problems such as difficulty in obtaining such magnetic field strength.
これらの問題を改善すべくなされた第３図の従来例で
は、バイアス磁界の発生手段として永久磁石５をデイス
ク２の半径方向に延在して並置し、モータ６によって永
久磁石５を回転して所望の磁界強度や磁界の方向を調整
する事により、前記の他の従来例の問題点であるヘッド
の移動機構や大型コイルによる電力損失を解消しようと
するものであるが、大型な永久磁石を要する事や永久磁
石を回転する為の機構部分を必要とする点など、依然、
未解決の問題点を有しており、実用的なバイアス磁界印
加方式を提供するものではない。In the conventional example shown in FIG. 3, which has been made to solve these problems, the permanent magnet 5 is extended in the radial direction of the disk 2 and is juxtaposed as the bias magnetic field generating means, and the permanent magnet 5 is rotated by the motor 6. By adjusting the desired magnetic field strength and the direction of the magnetic field, it is intended to eliminate the power loss due to the moving mechanism of the head and the large coil, which are the problems of the other conventional examples described above. However, it still requires a mechanical part to rotate the permanent magnet.
It has an unsolved problem and does not provide a practical bias magnetic field application method.
これに対して、特開昭５７−４０７６１号公報ではディ
スク半径方向に複数のコイルを並列し、走査される輝点
のみに対応したコイルを駆動することによりバイアス磁
界を発生している。しかし、この場合は、コイルとコイ
ルとの間が離れているため、コイルとコイルとの中間点
では発生するバイアス磁界がどうしても低下するという
問題がある。この場合、コイルの駆動電流を増加させれ
ば、記録または消去のための十分な磁界を発生すること
は可能であるが、大きな駆動電流が必要となり、無駄な
電力を消費し更に発熱量が増大して記録または消去に悪
影響を与えるという問題が発生する。On the other hand, in Japanese Unexamined Patent Publication No. 57-40761, a plurality of coils are arranged in parallel in the disk radial direction, and a coil corresponding to only bright spots to be scanned is driven to generate a bias magnetic field. However, in this case, since the coils are separated from each other, there is a problem that the bias magnetic field generated at the intermediate point between the coils is inevitably lowered. In this case, if the coil drive current is increased, it is possible to generate a sufficient magnetic field for recording or erasing, but a large drive current is required, wasteful power is consumed, and the amount of heat generation is further increased. Then, there is a problem that recording or erasing is adversely affected.
発明の目的 本発明は、上述した従来の垂直磁化式光磁気記録装置の
バイアス磁界印加方式の問題に鑑み、ヘッド等の移動機
構を要さずに、大型コイル等による大きな電力損失を生
じずに電気的な制御によつて簡便にして均質なバイアス
磁界を発生し、実用的なバイアス磁界印加手段を有する
光磁気記録装置ことを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the problem of the bias magnetic field applying method of the conventional perpendicular magnetization type magneto-optical recording apparatus described above, and does not require a moving mechanism such as a head, without causing a large power loss due to a large coil or the like. It is an object of the present invention to provide a magneto-optical recording device having a practical bias magnetic field applying means which simply generates a uniform bias magnetic field by electrical control.
発明の概要 本発明は、バイアス磁界印加手段を有する光磁気記録装
置において、垂直磁気異方性媒体に信号を記録するため
の光磁気ピックアップ手段と、上記媒体に対する上記ピ
ツクアップ手段の位置を検出する検出手段と、互いにそ
の一部が重なるように上記媒体に対向して配置され、局
所的バイアス磁界を発生する複数の磁界発生手段と、上
記検出手段で検出された検出信号に基づいて上記複数の
磁界発生手段を選択する選択信号を発生する制御手段
と、上記選択信号に基づいて上記複数の磁界発生手段を
選択的に駆動する駆動手段とを備えたことを特徴として
いる。SUMMARY OF THE INVENTION The present invention is a magneto-optical recording device having bias magnetic field applying means, and magneto-optical pickup means for recording a signal on a perpendicular magnetic anisotropic medium, and detection for detecting the position of the pick-up means with respect to the medium. Means, a plurality of magnetic field generating means that are arranged so as to partially overlap each other facing the medium and generate a local bias magnetic field, and the plurality of magnetic fields based on the detection signals detected by the detecting means. Control means for generating a selection signal for selecting the generation means and drive means for selectively driving the plurality of magnetic field generation means based on the selection signal are provided.
以下、図面を参照して本発明を詳細に説明する。Hereinafter, the present invention will be described in detail with reference to the drawings.
第４図は、本発明によるバイアス磁界印加手段を適用し
て構成された垂直磁化式光磁気記録装置の一実施例を示
す構成図である。FIG. 4 is a block diagram showing an embodiment of a perpendicular magnetization type magneto-optical recording device constituted by applying the bias magnetic field applying means according to the present invention.
ターンテーブル１に載置されたＭｎＢｉ、ＴｂＦｅ、Ｄ
ｙＦｅ等のデイスク２上に、記録、再生等のためのフオ
ーカシングやトラッキング機能を備えたピックアップ７
からデイスク２上にスポットを結ぶ光ビームを照射す
る。この光ビームを照射した部分にデイスク面に垂直な
バイアス磁界を印加して情報の記録又は消去を行うため
に、デイスク２をはさんでピックアップ７の反対面にデ
イスク２と融離して複数個の小型コイル８をデイスク２
の半径方向に各々のコイルが互いに適度に重なり合う様
に基本９上に並べて配置する。コイル８が発生する磁界
は、コイルの中心部を通る線上の磁界が最も強くここか
ら半径方向にずれるに連れその大きさは大きく低下す
る。従って、単にコイルを半径方向に並列したのでは、
コイル間の中間点でどちらのコイルからの磁界も大きく
はならないため、記録または消去のために十分な磁界は
得にくくなっている。そこで、この中間点での磁界を確
保するために本実施例では別のコイルを重ねて配設して
いる。MnBi, TbFe, and D placed on the turntable 1
A pickup 7 having focusing and tracking functions for recording and reproducing on a disk 2 such as yFe.
A light beam that connects the spots is emitted onto the disk 2. In order to record or erase information by applying a bias magnetic field perpendicular to the disk surface to the portion irradiated with the light beam, a plurality of disks are separated from the disk 2 on the opposite surface of the pickup 7 by sandwiching the disk 2. Small coil 8 to disk 2
Are arranged side by side on the base 9 so that the respective coils are overlapped with each other in the radial direction. The magnetic field generated by the coil 8 has the strongest magnetic field on a line passing through the central portion of the coil, and its magnitude greatly decreases as the magnetic field deviates in the radial direction. Therefore, if the coils are simply arranged in the radial direction,
Since the magnetic field from either coil does not become large at the midpoint between the coils, it is difficult to obtain a sufficient magnetic field for recording or erasing. Therefore, in order to secure the magnetic field at this intermediate point, another coil is arranged in an overlapping manner in this embodiment.
上記の複数のコイル８は、ピックアップ７の移動に対応
してピックアップからの再生信号あるいはピックアップ
の移動に応じた位置信号によって適当ないずれかのコイ
ルが選択されて電流が印加され、記録もしくは消去に対
応した極性の所望の垂直バイアス磁界を発生する。For the plurality of coils 8 described above, any one of the coils is selected in response to the movement of the pickup 7 by a reproduction signal from the pickup or a position signal according to the movement of the pickup, and a current is applied to the coil 8 for recording or erasing. Generate the desired vertical bias field of the corresponding polarity.
第５図は、本発明によるバイアス磁界印加手段を説明す
るための構成図である。第５図において、１０はピック
アップ７により再生された再生信号の入力端子、１１は
再生信号からデータ信号とクロック信号を分離するデー
タセパレータ、１２はデータ信号からアドレス信号を読
取るためのアドレス認識回路、１３はアドレス信号をコ
イル選択信号に変換するコントロール回路、１４はデイ
スクへの情報の記録もしくは消去を命令する極性切換端
子、１５は極性切換信号とコイル選択信号によりコイル
を選択して電流を印加するバイアス磁界順次切換回路、
１６はコイルを示す。FIG. 5 is a configuration diagram for explaining the bias magnetic field applying means according to the present invention. In FIG. 5, 10 is an input terminal for a reproduced signal reproduced by the pickup 7, 11 is a data separator for separating a data signal and a clock signal from the reproduced signal, 12 is an address recognition circuit for reading an address signal from the data signal, Reference numeral 13 is a control circuit for converting an address signal into a coil selection signal, 14 is a polarity switching terminal for commanding recording or erasing of information on a disk, and 15 is a polarity switching signal and a coil selection signal for selecting a coil to apply a current. Bias magnetic field sequential switching circuit,
Reference numeral 16 represents a coil.
第６図に、本発明によるバイアス磁界印加手段に適用す
るバイアス磁界順次切換回路の一実施例を示す。FIG. 6 shows an embodiment of the bias magnetic field sequential switching circuit applied to the bias magnetic field applying means according to the present invention.
バイアス磁界順次切換回路は、コイル電流の極性を切換
えて記録又は消去を行うコイル極性切換回路部分Ｉと、
適当な任意のコイルを選択して励磁電流をコイルに印加
するコイル選択回路部分IIとを主な構成要素としてい
る。The bias magnetic field sequential switching circuit includes a coil polarity switching circuit portion I for switching the polarity of the coil current for recording or erasing.
A main component is a coil selection circuit portion II for selecting an appropriate arbitrary coil and applying an exciting current to the coil.
コイル極性切換回路部分Ｉは、一方の極性切換端子１７
がインバータ１８を介しベース保護抵抗１９、２０を経
てトランジスタ２１，２２のベースに接続し、トランジ
スタ２１のコレクタはトランジスタ２５のベースバイア
ス抵抗２３、２４を介して電源Ｖｃｃに接続し、更にト
ランジスタ２５にダーリントン結合されたトランジスタ
２６と、他の極性切換端子２７に接続されるインバータ
２８を介してベース保護抵抗２９、３０を経てトランジ
スタ３１、３２のベースに接続し、トランジスタ３１の
コレクタはトランジスタ３５のバイアス抵抗３３、３４
を介して電源Ｖｃｃに接続し、更にトランジスタ３５に
ダーリントン結合されたトランジスタ３６によつて構成
される。The coil polarity switching circuit portion I includes one polarity switching terminal 17
Is connected to the bases of the transistors 21 and 22 via the base protection resistors 19 and 20 via the inverter 18, the collector of the transistor 21 is connected to the power supply Vcc via the base bias resistors 23 and 24 of the transistor 25, and further to the transistor 25. It is connected to the bases of transistors 31 and 32 through base protection resistors 29 and 30 via a Darlington-coupled transistor 26 and an inverter 28 connected to another polarity switching terminal 27, and the collector of the transistor 31 is biased by the transistor 35. Resistors 33, 34
Is connected to the power supply Vcc via the transistor 36 and is further connected to the transistor 35 by Darlington coupling.
コイル選択回路部分IIは、前記極性切換端子１７、２７
に接続するインバータ３７、３８の出力とコイル選択端
子３９、４０、４１とを入力とするＮＡＮＤゲート４２
〜４７に接続されるフォトカプラ４８〜５３によつて構
成され、各々のフォトカプラ４８〜５３はその一端を共
通にして前記コイル極性切換回路Ｉのトランジスタ３６
のエミッタ及びトランジスタ２２のコレクタに接続され
る。The coil selection circuit part II includes the polarity switching terminals 17 and 27.
NAND gate 42 having inputs of outputs of inverters 37 and 38 and coil selection terminals 39, 40 and 41 connected to
To 47, the photocouplers 48 to 53 are connected to the photocouplers 48 to 53. One end of each of the photocouplers 48 to 53 is common to the transistor 36 of the coil polarity switching circuit I.
Of the transistor 22 and the collector of the transistor 22.
本発明になるバイアス磁界を発生する小型コイル５４〜
５６は、巻線の片端を共通に接続して前記のコイル極性
切換回路部分Ｉのトランジスタ２６のエミッタ及びトラ
ンジスタ３２のコレクタに接続し、各コイルの独立な巻
線の他端は、コイル選択回路部分IIのフォトカプラ４８
〜５３にそれぞれ別個に接続され構成される。Small coil 54 for generating a bias magnetic field according to the present invention
Reference numeral 56 connects one end of the winding in common to the emitter of the transistor 26 and the collector of the transistor 32 of the coil polarity switching circuit part I, and the other end of the independent winding of each coil is connected to the coil selection circuit. Part II photo coupler 48
To 53 are separately connected and configured.
次に上記のごとく構成した本発明のバイアス磁界印加手
段の作用について説明する。Next, the operation of the bias magnetic field applying means of the present invention configured as described above will be described.
本実施例によれば、ピックアップ７からの再生信号から
アドレス信号が分離され、コントロール回路によつてピ
ックアップ７に対応する位置のコイルを選択するコイル
選択信号３９〜４１となりコイルを選択するとともに、
ディスクへの記録もしくは消去に対応してコイルに流す
電流の極性を切換える極性切換信号１４とによって、コ
イル８を選択し通電しディスクに記録もしくは消去する
バイアス磁界を印加する。または、上記のごとくディス
クに予め記録されたアドレス情報によらず、ピックアッ
プ７に連動するリニアエンコーダ等の位置検出器の位置
信号により、対応するコイルを選択して通電しバイアス
磁界を印加する。According to the present embodiment, the address signal is separated from the reproduced signal from the pickup 7, and the control circuit becomes the coil selection signals 39 to 41 for selecting the coil at the position corresponding to the pickup 7, and the coil is selected.
A bias magnetic field for selecting or energizing the coil 8 to apply a bias magnetic field for recording or erasing to the disk is selected by the polarity switching signal 14 for switching the polarity of the current flowing through the coil in response to recording or erasing on the disk. Alternatively, as described above, the corresponding coil is selected and energized to apply the bias magnetic field by the position signal of the position detector such as the linear encoder which interlocks with the pickup 7 regardless of the address information previously recorded on the disc.
バイアス磁界順次切換回路は極性切換端子１７をＬレベ
ルにすることによりインバータ１８の出力はＨレベルと
なり、トランジスタ２１をＯＮしコイルに電流を供給す
るトランジスタ２５、２６をＯＮ状態とする。同時に、
コイル５４、５５、５６からコイル選択回路部分を経て
電流を吸込むトランジスタ２２はインバータ１８のＨレ
ベルによりＯＮ状態となる。この状態で、コイル選択端
子３９をＨレベルとすると、極性切換端子１７に接続す
るインバータ３８のＨレベル出力と相まつて、ゲート４
３の出力をＬレベルとし、フォトカプラ４９をＯＮ状態
にする。その結果、電源Ｖｃｃからトランジスタ２６、
コイル５４、フォトカプラ４９、吸込トランジスタ２２
を経てＧＮＤにコイル電流を流す。In the bias magnetic field sequential switching circuit, the output of the inverter 18 becomes H level by setting the polarity switching terminal 17 to L level, turning on the transistor 21 and turning on the transistors 25 and 26 for supplying current to the coils. at the same time,
The transistor 22 that draws current from the coils 54, 55 and 56 via the coil selection circuit portion is turned on by the H level of the inverter 18. When the coil selection terminal 39 is set to H level in this state, the gate 4 is connected with the H level output of the inverter 38 connected to the polarity switching terminal 17.
The output of 3 is set to L level, and the photocoupler 49 is turned on. As a result, from the power supply Vcc to the transistor 26,
Coil 54, photo coupler 49, suction transistor 22
A coil current is passed to GND via.
同様に、極性切換端子１７，２７の選択とコイル選択端
子３９、４０、４１の選択によつてコイル５４、５５、
５６の任意のいずれかに、所望の極性の磁界を生じさせ
ることが出来る。Similarly, by selecting the polarity switching terminals 17, 27 and the coil selecting terminals 39, 40, 41, the coils 54, 55,
A magnetic field of desired polarity can be produced on any of 56.
発明の効果 以上のごとく、本発明によると、従来技術に比して、バ
イアス磁界用のヘッドの移動機構を要さず、低電力損失
のバイアス磁界発生手段を有する光磁気記録装置を提供
できる。更に、複数設けられた磁界発生手段は互いにそ
の一部が重なるように上記媒体に対向して配置されるの
で、重なりを持たないように並べる場合と比べて、均一
な磁界の分布をより低い消費電力で得ることが可能とな
る。EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to provide a magneto-optical recording apparatus having a bias magnetic field generating means of low power loss, which does not require a moving mechanism of a head for a bias magnetic field as compared with the prior art. Further, since the plurality of magnetic field generating means provided are arranged so as to face the medium so that the magnetic field generating means are partially overlapped with each other, a uniform magnetic field distribution can be consumed at a lower level as compared with the case where the magnetic field generating means are arranged so as not to have an overlap. It becomes possible to obtain it with electric power.
尚、本発明は上記実施例ではコイルを３ケとしたがこれ
に限定されるものではなく、同様に上記実施例ではフォ
トカプラを用いたがこれに限定されることはなく発光ダ
イオードとフォトトランジスタの組合せ、あるいはＦＥ
Ｔなどでよい。要するに本発明はその要旨を逸脱しない
範囲で種々変形して実施することができる。Although the present invention has three coils in the above embodiment, the present invention is not limited to this. Similarly, a photocoupler is used in the above embodiment, but the invention is not limited to this, and a light emitting diode and a phototransistor are used. Or FE
It may be T or the like. In short, the present invention can be variously modified and implemented without departing from the scope of the invention.
第１図は従来のヘッド移動式のバイアス磁界印加方式を
示す図、第２図はディスクの外周に大型コイルを設ける
従来の他のバイアス磁界印加方式を示す図、第３図は永
久磁石を用いる従来のバイアス磁界印加方式を示す図、
第４図は本発明のバイアス磁界印加方式を示す図、第５
図は本発明によるバイアス磁界印加方式を説明するため
の構成図、第６図は本発明によるバイアス磁界印加方式
に適用するバイアス磁界順次切換回路の一実施例を示す
図である。 １……ターンテーブル ２……ディスク ３……バイアス磁界印加用ヘッド ５……大型コイル ５……永久磁石 ６……モータ ７……ピックアップ ８……小型コイル ８……基 体 １０……再生信号入力端子 １１……データセパレータ １２……アドレス認識回路 １３……コントロール回路 １４……極性切換信号入力端子 １５……バイアス磁界順次切換回路 １６……コイル １７……極性切換端子 １８……インバータ １９、２０……保護抵抗 ２１、２２……トランジスタ ２３、２４……バイアス抵抗 ２５、２６……トランジスタ ２７……極性切換端子 ２８……インバータ ２９、３０……保護抵抗 ３１、３２……トランジスタ ３３、３４……バイアス抵抗 ３５、３６……トランジスタ ３７、３８……インバータ ３９、４０，４１……コイル選択端子 ４２〜４７……ゲート ４８〜５３……フォトカプラ ５４〜５６……コイルFIG. 1 is a diagram showing a conventional head moving type bias magnetic field applying system, FIG. 2 is a diagram showing another conventional bias magnetic field applying system in which a large coil is provided on the outer periphery of a disk, and FIG. 3 uses a permanent magnet. A diagram showing a conventional bias magnetic field application method,
FIG. 4 is a diagram showing a bias magnetic field applying method of the present invention, and FIG.
FIG. 6 is a block diagram for explaining a bias magnetic field applying system according to the present invention, and FIG. 6 is a diagram showing an embodiment of a bias magnetic field sequential switching circuit applied to the bias magnetic field applying system according to the present invention. 1 ... Turntable 2 ... Disk 3 ... Bias magnetic field applying head 5 ... Large coil 5 ... Permanent magnet 6 ... Motor 7 ... Pickup 8 ... Small coil 8 ... Base 10 ... Playback signal Input terminal 11 ... Data separator 12 ... Address recognition circuit 13 ... Control circuit 14 ... Polarity switching signal input terminal 15 ... Bias magnetic field sequential switching circuit 16 ... Coil 17 ... Polarity switching terminal 18 ... Inverter 19, 20 ... Protective resistance 21,22 ... Transistor 23,24 ... Bias resistance 25,26 ... Transistor 27 ... Polarity switching terminal 28 ... Inverter 29,30 ... Protective resistance 31,32 ... Transistor 33,34 ...... Bias resistance 35, 36 ...... Transistor 37, 38 ...... Inverter 39, 40, 41 …… Coil択端Ko 42 to 47 ...... gate 48-53 ...... photo coupler 54 to 56 ...... coil
Claims (1)
の光磁気ピックアップ手段と、 上記媒体に対する上記ピックアップ手段の位置を検出す
る検出手段と、 互いにその一部が重なるように上記媒体に対向して配置
され、複数の局所的バイアス磁界を発生する複数の磁界
発生手段と、 上記検出手段で検出された検出信号に基づいて上記複数
の磁界発生手段を選択する選択信号を発生する制御手段
と、 上記選択信号に基づいて上記複数の磁界発生手段を選択
的に駆動する駆動手段とを備えたことを特徴とする光磁
気記録装置。1. A magneto-optical pickup means for recording a signal on a perpendicular magnetic anisotropic medium, and a detection means for detecting a position of the pickup means with respect to the medium, wherein the medium is formed so as to partially overlap each other. A plurality of magnetic field generating means arranged to face each other for generating a plurality of local bias magnetic fields, and a control means for generating a selection signal for selecting the plurality of magnetic field generating means based on the detection signal detected by the detecting means. And a drive unit that selectively drives the plurality of magnetic field generation units based on the selection signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2993484A JPH065561B2 (en) | 1984-02-20 | 1984-02-20 | Magneto-optical recording device |
| DE19853510620 DE3510620A1 (en) | 1984-02-20 | 1985-03-23 | Device for the generation of a magnetic field in a recording apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2993484A JPH065561B2 (en) | 1984-02-20 | 1984-02-20 | Magneto-optical recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60175202A JPS60175202A (en) | 1985-09-09 |
| JPH065561B2 true JPH065561B2 (en) | 1994-01-19 |
Family
ID=12289811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2993484A Expired - Lifetime JPH065561B2 (en) | 1984-02-20 | 1984-02-20 | Magneto-optical recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH065561B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0677349B2 (en) * | 1985-03-20 | 1994-09-28 | 株式会社日立製作所 | Magneto-optical disk device |
| JPS61271641A (en) * | 1985-05-28 | 1986-12-01 | Canon Inc | Optomagnetic recording and reproducing device |
-
1984
- 1984-02-20 JP JP2993484A patent/JPH065561B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60175202A (en) | 1985-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0485359B1 (en) | An external magnetic field inverting apparatus for a magneto-optical disc apparatus | |
| US4477852A (en) | Magneto-optical recording and reproducing system | |
| CA2081864C (en) | External magnetic field generation apparatus | |
| US4670865A (en) | Method of recording information on magneto-optic information storage medium | |
| JPH07118106B2 (en) | Magneto-optical recording / reproducing device | |
| JPH065561B2 (en) | Magneto-optical recording device | |
| JPS63167402A (en) | Information recorder/reproducer | |
| US5159584A (en) | Bias-Magnetic field generating system of photo-magnetic recording device | |
| EP0241222B1 (en) | Opto-magnetic recording apparatus for sequentially driving optical head drive means and biasing magnetic field generation means | |
| US5369628A (en) | Magneto-optic recording medium, magneto-optic recording system and magneto-optic recording method | |
| JPS61260439A (en) | optical information recording device | |
| JP2811673B2 (en) | Magnetic field applying electromagnet for magneto-optical disk | |
| JPS61240453A (en) | magneto-optical disk device | |
| US5623463A (en) | Method for determining a focusing control operation position in an opto-magnetic disc recording/reproducing apparatus | |
| JPS61214266A (en) | Magneto-optical recording/reproducing device | |
| US5197048A (en) | Magneto-optic recording medium, magneto-optic recording system and magneto-optic recording method | |
| JP3365020B2 (en) | Magnetic field modulation head of magneto-optical disk | |
| JPH01251359A (en) | Method for rewriting data of magneto-optical recording and reproducing device | |
| JPS60175201A (en) | Bias magnetic field impressing system | |
| JPS63113839A (en) | Magneto-optical information recording and reproducing device | |
| JPS61196446A (en) | Photomagnetic recording device | |
| JPH0422403Y2 (en) | ||
| JPS60147950A (en) | Information file which permits simultaneous erasing and recording | |
| JP3104913B2 (en) | Optical recording method and apparatus for disk-shaped recording medium | |
| JPS58218003A (en) | Recording system |