JPS60175201A - Bias magnetic field impressing system - Google Patents
Bias magnetic field impressing systemInfo
- Publication number
- JPS60175201A JPS60175201A JP2993384A JP2993384A JPS60175201A JP S60175201 A JPS60175201 A JP S60175201A JP 2993384 A JP2993384 A JP 2993384A JP 2993384 A JP2993384 A JP 2993384A JP S60175201 A JPS60175201 A JP S60175201A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- bias magnetic
- disk
- coil
- coils
- 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
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
- G11B11/10595—Control of operating function
-
- 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
Abstract
Description
【発明の詳細な説明】
発明の技術分野
本発明は膜面に垂直な磁気異方性を有する磁性記録媒体
全使用した垂直磁化式光磁気記録装置のバイアス磁界印
加方式に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a bias magnetic field application method for a perpendicular magnetization type magneto-optical recording device that uses a magnetic recording medium having magnetic anisotropy perpendicular to the film plane.
従来技術の問題点
従来−垂直磁化式元磁気記録装置に用いら几るバイアス
磁界の印塀万式は、第１図に示すようにターンテーブル
１上に載置した記録媒体となるディスク２の裏面に移動
式のバイアス磁界印加用ヘッド３會設け、そのギャップ
に発生する漏洩磁界をディスク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
なディスク２の外周に大型のコイル４全設置し、ディス
ク２の全域にわたってバイアス磁界を加える方式が用い
らｎている。しかしながら。Problems with the Prior Art Conventionally, the bias magnetic field control system used in perpendicular magnetization type original magnetic recording devices has a problem with the bias magnetic field applied to the disk 2, which is a recording medium placed on a turntable 1, as shown in FIG. There is a method in which three movable bias magnetic field applying heads are provided on the back surface, and the leakage magnetic field generated in the gap is moved to the required area of the disk 2 to apply a bias magnetic field, A method is used in which a large coil 4 is entirely installed on the outer periphery and a bias magnetic field is applied over the entire area of the disk 2. however.
第１図の移動式ヘッド？用いる方式では、ディスク上の
情報を記録や消去する位置に対応してヘツド？ディスク
の半径方向に移動させなけｎばならないので、移動機構
が複雑とな９１元磁気記録装置の大型化をまねく等の問
題点全音している。The movable head in Figure 1? The method used determines which head corresponds to the position on the disk where information is recorded or erased. Since it has to be moved in the radial direction of the disk, there are problems such as a complicated movement mechanism and an increase in the size of the 91-element magnetic recording device.
−万、第２図の従来例では、上記のＳ勤ヘッドを用いる
方式に比べて復雑な移動機構全装しない利点があるが、
ディスク２の外周に設けるコイルが大型化し、ディスク
への情報の記録又は消去に必要な磁界強度？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
全まねき、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。-The conventional example shown in Fig. 2 has the advantage that it does not have a complete complicated moving mechanism compared to the above-mentioned system using the S-shift head.
As the coil installed around the outer circumference of the disk 2 increases in size, the magnetic field strength required to record or erase information on the disk increases? This requires a large amount of electric power, which causes many problems such as heat generation in the coil, an increase in the size of the power supply, and difficulty in obtaining a uniform magnetic field strength.
こｎらの問題全改善すべくなさｆした２３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會デイス
ク２の半径方向に延在して並置し。In the conventional example shown in FIG. 23, which was designed to alleviate all of these problems, five permanent magnets are arranged in parallel in the radial direction of the disk 2 as means for generating a bias magnetic field.
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８石
′ｔ−要する事や永久磁石全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部方式全提供するものでにない
。By rotating the permanent magnet 5 by the motor 6 and adjusting the desired magnetic field strength and direction, the power loss caused by the head moving mechanism and large coil, which are the problems of the other conventional methods mentioned above, is solved. However, there are still unresolved problems such as the need for a large permanent magnet of 8 magnets and the need for a mechanical part for the permanent magnet to rotate fully.
It does not provide all practical bias magnetic field impression methods.
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ｔ″要さず、大型コイル等による大きな電力損失を生
じずに電気的制御によって簡便な、かつ、均質なバイア
ス磁界１−発生する実用的なバイアス磁界印部方式全提
供すること全目的とする。Purpose of the Invention In view of the above-mentioned problems of the bias magnetic field application method of the conventional perpendicular magnetization type magneto-optical recording device, the present invention provides a system that does not require a moving mechanism t'' for a head or the like and does not cause large power loss due to a large coil or the like. The overall purpose of the present invention is to provide a practical bias magnetic field application system that generates a simple and homogeneous bias magnetic field 1 through electrical control.
発明の概要
本発明は、上記目的を達成すべく、記録膜面に垂直な磁
気異方性を有する磁性記録媒体？使用するつ垂直磁化式
光磁気記録に用いらｎるバイアス磁界印塀万式において
、記録媒体に隔離して２以上の分割し九に修養奉寺→磁
界発生装置を連接し、゛て一方向に配置し、ピックアッ
プ又は記録部分の移動に合わせて対応する磁界発生装置
？適宜選択して励磁させ、最適な極性と強度金有するバ
イアス磁界１得ることを特徴とするものである。Summary of the Invention In order to achieve the above object, the present invention provides a magnetic recording medium having magnetic anisotropy perpendicular to the recording film surface. In the bias magnetic field impression method used in perpendicular magnetization type magneto-optical recording, the recording medium is isolated and divided into two or more, and the Shuyohoji → magnetic field generator is connected to the recording medium, and the magnetic field generator is connected in one direction. A magnetic field generating device placed in the area and corresponding to the movement of the pickup or recording part? It is characterized in that a bias magnetic field 1 having optimal polarity and strength is obtained by appropriately selecting and excitation.
以下１図面全参照して本発明の詳細な説明する。The present invention will be described in detail below with reference to all the drawings.
第４図は本発明によるバイアス磁界印２１０万式を適用
し磁界発生装置とじてコイルを用いて構成さｎた垂直磁
化式光磁気記録装置の一実施例を示すＴ）／丁ｅ
町ｄ峰％の膜面に垂直な磁気異方性を有する磁性記録媒
体としてのディスク２上に、記録、再生等のためのフォ
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
からディスク２上にスポットを結ぶ光ビームを照射する
。この元ビームを照射した部分にディスク面に垂直なバ
イアス磁界全印加して情報の記録又は消去を行、うため
に、ディスク２ｋｔｒｌさんでピックアツプ７０反対面
にディスク２と締離して複数個の小型コイル８ｔ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
う様に基体９土に並べて配置する。FIG. 4 shows an embodiment of a perpendicular magnetization type magneto-optical recording device using a bias magnetic field stamp according to the present invention and using a coil as a magnetic field generator. A pickup 7 equipped with focusing and tracking functions for recording, reproduction, etc. is mounted on a disk 2 as a magnetic recording medium having magnetic anisotropy perpendicular to the film surface of %.
A light beam that connects spots on the disk 2 is irradiated from the disk 2. In order to record or erase information by applying a full bias magnetic field perpendicular to the disk surface to the area irradiated with the original beam, a plurality of small-sized disks are placed on the opposite surface of the pickup 70 of the disk 2ktrl, separated from the disk 2. The coils 8t are arranged side by side on the base body 9 in the radial direction of the disk 2 so that the coils overlap each other moderately.
上記の複数のコイル８は、ビックアシ１７の移動に対応
した適当ないずｎかのコイルが後述のノ（イアス磁界順
次切換回路により選択さｎ″’ｃ′Ｆ！Ｌ流が印加さｎ
％所望の垂直バイアス磁界を発生する。The plurality of coils 8 mentioned above are selected by the following magnetic field sequential switching circuit to which a suitable coil corresponding to the movement of the big foot 17 is applied.
% to generate the desired vertical bias magnetic field.
２５図に１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。FIG. 25 shows an embodiment of a bias magnetic field sequential switching circuit applied to the bias magnetic field application method 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？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全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■とを主な構成要素としている
。Is the bias magnetic field sequential switching circuit the polarity of the coil current? a coil polarity switching circuit portion I that performs recording or erasing by switching;
The main component is a coil selection circuit section (2) which selects all suitable arbitrary coils and applies excitation current to the coils.
コイル極性切換回路部分Ｉは一万の極性切換端子１０が
インバータ１１を介しペース保護抵抗１２．１３ｔ−経
てトランジスタ１４．１５のベースに接続し、トランジ
スタ１４のコレクタはトランジスタ１８のベースバイア
ス抵抗１６．１７ｔ−介して電源Ｖｃｃに接続し、更に
トランジスタ１８にダーリントン結合さ１ｒＬｆｃトラ
ンジスタ１９と、他の極性切換端子２０に接続式ｎるイ
ンバータ２１を介してベース保護抵抗２２．２３’ｅ経
てトランジスタ２４．２５のベースに接続し、トランジ
スタ２４のコレクタはトランジスタ２８のバイアス抵抗
２６．２７ｔ−介して電源Ｖｃｃに接続し、更にトラン
ジスタ２８にダーリントン納会さｒｔたトランジスタ２
９によって構成さｎる。In the coil polarity switching circuit part I, ten thousand polarity switching terminals 10 are connected to the base of a transistor 14.15 through an inverter 11 and a pace protection resistor 12.13t, and the collector of the transistor 14 is connected to the base bias resistance 16.15 of a transistor 18. 17t- to the power supply Vcc, and further connected to the transistor 18 through a Darlington-coupled 1rLfc transistor 19, and an inverter 21 connected to the other polarity switching terminal 20, via the base protection resistor 22.23'e, and then to the transistor 24. The collector of the transistor 24 is connected to the power supply Vcc through the bias resistor 26 of the transistor 28, and the transistor 2 connected to the transistor 28 is connected to the base of the transistor 25.
Consisting of 9.
コイル選択回路部分■は、前記極性切換端子１Ｏ１２０
に接続するインバータ３０．３１の出力とコイル選択端
子３２．３３．３４と全入力とするＮＡＮＤゲート３５
〜４０に接続されるフォトカプラ４１〜４６によって構
成さｎ、各々の７オトカプラ４１〜４６はその一端全共
通にして前記コイル極性切換回路■のトランジスタ２９
のエミッタ及びトランジスタ１５のコレクタに接続さｎ
る。The coil selection circuit part ■ is the polarity switching terminal 1O120.
The output of the inverter 30.31 connected to the coil selection terminal 32.33.34 and the NAND gate 35 as all inputs.
40, each of the 7 photocouplers 41 to 46 has one end common to the transistor 29 of the coil polarity switching circuit (2).
connected to the emitter of n and the collector of transistor 15
Ru.
本発明になるバイアス磁界を発生する小型コイル４７〜
４９に、嬌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１９のエミッタ及びトラ
ンジスタ２５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■のフォトカプラ４１
〜４６にそｎぞｎ別個に接続され構成さ几る。Small coil 47 for generating a bias magnetic field according to the present invention
49, one end of the wire is commonly connected to the emitter of the transistor 19 and the collector of the transistor 25 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 ■ Photocoupler 41
.about.46 are separately connected and configured.
２６図に本発明によるバイアス磁界印加方式に適用する
複数のコイルの１ケの構成を示す概略図を示す。ディス
クへの記録又は消去する範囲を矩形とした場付、長辺の
長さｔ−２８，短辺の長さを２ｂとした矩形のコイル５
０の巻線に電流ｉ流した場合に、コイルの中心から高さ
ｘｌｃ載置さｎたティスフ上の点Ｐにおける磁界の垂直
成分の強度 Ｈｌ；ｊ
から定まる。FIG. 26 is a schematic diagram showing the configuration of one of the plurality of coils applied to the bias magnetic field application method according to the present invention. A rectangular coil 5 with a rectangular area for recording or erasing on a disk, with a long side length t-28 and a short side length 2b.
It is determined from the intensity Hl;j of the vertical component of the magnetic field at a point P on the tisf placed at a height xlc from the center of the coil when a current i flows through the winding 0.
ディスクへの配置範囲をディスクの半径７５回に４０總
程度とし７ｃ場甘、単一の矩形コイルで磁界を印加する
場合にｔＸＺ ａｔ”４０１１１１１．２２ｂ１５゜ｘ
１ｉディスクとコイルの間隔から５誠程度としたコイル
となり、励ａｌｔ流ＶＩＡとしコイルの巻線のターン数
′９ｔ１とした場合にはディスク面Ｐでの磁界強度Ｈに
２６．３Ａ／ＩＩとなる。上記と同様な記ｆＩ＜範囲に
４分割したコイルで磁界を与える場合には１分割して配
置したコイルの２ａｔ！１０＋ｓでょく、２ｂとｘ２前
記単一コイルと同様にそ：ｎ、−ｔ’ｎ５ｍとした場合
同じｌＡの励磁電流によって得らｎるディスク面での磁
界強度Ｈ１ｊ２７゜６ Ａ／ｍとなり前記単一コイルの
場合とほぼ同等である。−万コイルの直流抵抗は、単一
コイルに比べて４分割したコイルでに１／３となり、従
って励磁電力は。When applying a magnetic field with a single rectangular coil, the arrangement range on the disk is about 40 coils in 75 radius of the disk, and tXZ at"4011111.22b15゜x
If the distance between the 1i disk and the coil makes the coil about 5 increments, and the excitation flow is VIA and the number of turns of the coil winding is '9t1, the magnetic field strength H at the disk surface P will be 26.3A/II. . When applying a magnetic field with a coil divided into four in the range fI< similar to the above, 2at! of the coil divided into one! 10+s, 2b and x2 Similarly to the single coil above, if so:n, -t'n5m, the magnetic field strength at the disk surface obtained by the same excitation current of 1A is H1j27°6 A/m, which is the above. This is almost equivalent to the case of a single coil. -The DC resistance of 10,000 coils is 1/3 of that of a single coil, so the excitation power is 1/3 of that of a single coil.
１／３で同じ磁界強度が得らｎる。従って、目的に応じ
て適した型状の小型コイルを適当な数に分割して配置し
、所望のバイアス磁界を得る最適な構成にすることがで
きる。The same magnetic field strength can be obtained at 1/3. Therefore, by dividing and arranging a suitable number of small coils in a shape suitable for the purpose, it is possible to obtain an optimal configuration for obtaining a desired bias magnetic field.
次に上記の如く構成した本発明のバイアス磁界印側万式
の作用について説明する。Next, the operation of the bias magnetic field application system of the present invention constructed as described above will be explained.
本発明によｎば適当に分割した２ケ以上の小型のバイア
スコイル８を、接続するバイアス磁界順次切換回路によ
って選択して通電し、ディスク２土への記録や消去に必
要なバイアス磁界全局所的に発生させることが出来る。According to the present invention, two or more appropriately divided small bias coils 8 are selectively energized by a connected bias magnetic field sequential switching circuit, and the bias magnetic field necessary for recording and erasing on the disk 2 is applied to all localized areas. can be generated.
極性切換端子１０をＬレベルにすることによりインバー
タ１１の出力にＨレベルとなり、トランジスタ１４全Ｏ
ＮＬコイルに電流を供給するトランジスタ１８．１９ｔ
−ＯＮ状態とする。同時に、コイル４７．４８．４９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
１５はインバータ１１のＨレベル出力によりＯＮ状態と
なる＠
この状態でコイル選択端子３２’ｋＨレベルとすると、
極性切換端子ｌＯに接続するインバータ３１のＩＩレベ
ル出力と相まって、ゲート３６の出力＝ｉＬレベルとし
、フォトカグラ４２％ＯＮ状態にする。その結果、電源
Ｖｃｃからトランジスタ１９゜コイル４７．フォトカブ
ラ４２．吸込トランジスタ１５を経てＧＮＤにコイル励
磁電流を流す。By setting the polarity switching terminal 10 to the L level, the output of the inverter 11 becomes the H level, and the transistor 14 is completely turned off.
Transistor 18.19t that supplies current to the NL coil
- Set to ON state. At the same time, the transistor 15, which sucks current from the coils 47, 48, and 49 through the coil selection circuit section, is turned on by the H level output of the inverter 11. If the coil selection terminal 32'kH level is set in this state,
Coupled with the II level output of the inverter 31 connected to the polarity switching terminal 1O, the output of the gate 36 becomes iL level, and the photoconverter is turned on 42%. As a result, the transistor 19° coil 47. Photo Cabra 42. A coil excitation current is passed through the suction transistor 15 to GND.
同様に、極性切換胞子１０．２０の選択とコイル選択端
子３２．３３．３４の永択によってコイル４７．４８．
４９の任意のいずＩＬかに、所望の極性の磁界を生じさ
せる亭が出来る。Similarly, by selecting the polarity switching spore 10.20 and permanently selecting the coil selection terminals 32.33.
At any one of the 49 ILs, a bow can be created that generates a magnetic field of desired polarity.
発明の効果
以上のごとく１本発明によると従来技術に比して一複数
に分割して配置した小型のコイル？任意に電気的に選択
して所望のバイアス磁界をディスクの必要な箇所に印児
する事か出来るので、コイルを移動させる機講も蓉さず
、又、低電力損失のバイアス磁界発生方式を提供できる
。更に、小型コイル全使用する事により磁界の発生効率
全高め記録又は消去に必要な領域に、一様な磁界會印加
せしめ易いなどの効果？有する。Effects of the Invention According to the present invention, compared to the prior art, the coil is divided into multiple parts and is smaller in size. Since the desired bias magnetic field can be arbitrarily selected electrically and applied to the required location on the disk, there is no need to move the coil, and it also provides a bias magnetic field generation method with low power loss. can. Furthermore, by using all of the small coils, the efficiency of magnetic field generation is increased, making it easier to apply a uniform magnetic field to the area required for recording or erasing. have
尚１本発明は上記笑施例に限定さｎるものではなく１例
えば、記録媒体としてディスクに限定さｎることはなく
また。バイアス磁界の発生手段もコイルに限定さｎるこ
とはない。要するに本発明はその要旨全逸脱しない範囲
で種々変形して笑施することかできる。Note that the present invention is not limited to the above-mentioned embodiments, and is not limited to, for example, a disk as a recording medium. The means for generating the bias magnetic field is not limited to a coil either. In short, the present invention can be modified in various ways without departing from its gist.
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、２３図は永
久礎石全相いる従来のバイアス磁界印加方式を示す図、
第４図に本発明のバイアス磁界印Ｗ万式會示す図、２５
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金示す図、２６図は本
発明によるコイルの構成を示す概略図である。
ｌ・・・ターンテーブル、２・・・ディスク、３・・・
バイアス磁界印Ｗ用ヘッド、４・・・大型コイル、５・
・・永久研石、６・・・モータ、７・・・ピックアップ
、８・・・小型コイル、９・・・基体、１０・・・極性
切換端子、１１・・・インバーター １２・・・保護抵
抗、１３・・・保護抵抗。
１４・・・トランジスタ、１５・・・ト、ランジスタ、
１６・・・バイアス抵抗、１７・・・バイアス抵抗、１
８．１９・・・トランジスタ、２０・・・極性切換端子
、２１・・・インバータ、２２．２３・・・ペース保ｆ
ｉ抵抗、２４・・・トランジスタ、２５・・・トランジ
スタ、２６．２７・・・ノ５イ・アス抵抗、２８，２９
・・・トランジスタ。
３０．３１・・・インバータ、３２．３３％ ３４・・
・コイル選択端子、３５．３６．３７．３８％３９゜４
０・・・ＮＡＮＤゲー ト、４１．４２、４３．４４゜
４５．４６・・・７オトカグラ、４７・・・コイル、４
８゜４９・・・コイル、５０・・・矩形コイル。
特許出願人 オリンパス元学工業株式会社代理人弁理士
奈 良 武
第３図
す
第４図
第６図Figure 1 shows a conventional head-moving bias magnetic field application system, Figure 2 shows another conventional bias magnetic field application system in which a large coil is installed around the outer periphery of the disk, and Figure 23 shows a permanent cornerstone all-phase system. A diagram showing the conventional bias magnetic field application method,
Figure 4 shows the bias magnetic field stamp W of the present invention, 25
26 is a diagram showing an embodiment of a bias magnetic field sequential switching circuit applied to the bias magnetic field application method according to the present invention, and FIG. 26 is a schematic diagram showing the configuration of a coil according to the present invention. l...turntable, 2...disc, 3...
Head for bias magnetic field stamp W, 4... Large coil, 5.
...Permanent grinding stone, 6...Motor, 7...Pickup, 8...Small coil, 9...Base, 10...Polarity switching terminal, 11...Inverter 12...Protection resistor , 13...protective resistance. 14...transistor, 15...t, transistor,
16...Bias resistance, 17...Bias resistance, 1
8.19...Transistor, 20...Polarity switching terminal, 21...Inverter, 22.23...Pace maintenance f
i resistance, 24...transistor, 25...transistor, 26.27...no5 i/as resistance, 28,29
...transistor. 30.31...Inverter, 32.33% 34...
・Coil selection terminal, 35.36.37.38% 39°4
0...NAND gate, 41.42, 43.44°45.46...7 Otokagura, 47...Coil, 4
8゜49...Coil, 50...Rectangular coil. Patent Applicant: Olympus Gengaku Kogyo Co., Ltd. Representative Patent Attorney Takeshi Nara Figure 3 Figure 4 Figure 6
Claims (1)
使用した垂直磁化式光磁気記録に用いるバイアス磁界印
加方式において、少なくとも２ケ所以上の連続したバイ
アス磁界全発生する様にし、上記２ケ所以上の連続した
バイアス磁界の任意の１ケ所全選択してバイアス磁界を
印加する様にしたことを特徴とするバイアス磁界印加方
式。 （２１前記バイアス磁界は、磁性記録媒体に隔離して並
置さｎる２ヶ以上のコイルによシ発生さｎ、隣接する当
該コイルに互いに適度に重な＃）あって１選択して発生
するバイアス磁界が記録媒体上で常に一様でおる特許請
求の範囲７１項記載のバイアス磁界印加方式。 （３１前記バイアス磁界は、基体に固着さｎた箔状又に
線状コイルにより得ることｔ特徴とする特許請求の範囲
第１項記載のバイアス磁界印加方式。[Claims] il+Magnetic anisotropy perpendicular to the film surface? In a bias magnetic field application method used in perpendicular magnetization type magneto-optical recording using a magnetic recording medium with magnetic recording media, at least two or more continuous bias magnetic fields are generated, and any one of the two or more continuous bias magnetic fields is generated. A bias magnetic field application method characterized by applying a bias magnetic field to all selections. (21) The bias magnetic field is generated by two or more coils that are placed in parallel and isolated on the magnetic recording medium, and one of the adjacent coils is selected and generated. 72. The bias magnetic field application method according to claim 71, wherein the bias magnetic field is always uniform on the recording medium. (31) The bias magnetic field application method according to claim 1, wherein the bias magnetic field is obtained by a foil-like or linear coil fixed to a base body.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2993384A JPS60175201A (en) | 1984-02-20 | 1984-02-20 | Bias magnetic field impressing system |
| 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 |
|---|---|---|---|
| JP2993384A JPS60175201A (en) | 1984-02-20 | 1984-02-20 | Bias magnetic field impressing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60175201A true JPS60175201A (en) | 1985-09-09 |
Family
ID=12289785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2993384A Pending JPS60175201A (en) | 1984-02-20 | 1984-02-20 | Bias magnetic field impressing system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60175201A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5159584A (en) * | 1989-08-15 | 1992-10-27 | Olympus Optical Company Limited | Bias-Magnetic field generating system of photo-magnetic recording device |
| US5293360A (en) * | 1989-03-09 | 1994-03-08 | Canon Kabushiki Kaisha | Magnetic field generating device |
| US5317548A (en) * | 1989-12-06 | 1994-05-31 | Matsushita Electric Industrial Co., Ltd. | Reduced height magnetic bias apparatus for a magnetooptical disk drive including a coil means having a central axis perpendicular to the rotating axis of a rotatable magnet |
-
1984
- 1984-02-20 JP JP2993384A patent/JPS60175201A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5293360A (en) * | 1989-03-09 | 1994-03-08 | Canon Kabushiki Kaisha | Magnetic field generating device |
| US5159584A (en) * | 1989-08-15 | 1992-10-27 | Olympus Optical Company Limited | Bias-Magnetic field generating system of photo-magnetic recording device |
| US5317548A (en) * | 1989-12-06 | 1994-05-31 | Matsushita Electric Industrial Co., Ltd. | Reduced height magnetic bias apparatus for a magnetooptical disk drive including a coil means having a central axis perpendicular to the rotating axis of a rotatable magnet |
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