JPS6010401A - Optical magnetic disc device - Google Patents
Optical magnetic disc deviceInfo
- Publication number
- JPS6010401A JPS6010401A JP11925983A JP11925983A JPS6010401A JP S6010401 A JPS6010401 A JP S6010401A JP 11925983 A JP11925983 A JP 11925983A JP 11925983 A JP11925983 A JP 11925983A JP S6010401 A JPS6010401 A JP S6010401A
- Authority
- JP
- Japan
- Prior art keywords
- medium
- optical head
- magnetic
- magnetic circuit
- magnetic field
- 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.)
- Granted
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
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
（ａ） 発明の技術分野
本発明は光磁気記録において、情報の記録、消去に必要
な媒体面に垂直な外部磁界を効率よく得るようにした光
磁気ディスク装置に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a magneto-optical disk device that efficiently obtains an external magnetic field perpendicular to the medium surface necessary for recording and erasing information in magneto-optical recording.
（ｂ） 技術の背景
光磁気ディスク等の光磁気記録装置は媒体に一定磁界を
印加しておいて、その媒体にレムザ光笠を照射し、部分
的にキュリ一点以上に加熱することによシ媒体に残留し
ている磁化の方向を、印加されている磁界の磁化方向に
向けることによシ情報の記録もしくは消去を行っている
。この情報の記録及び消去時において、媒体上に形成さ
れた光スポットの近傍を、記録時、消去時で互いに逆方
向の一定磁界中に置く為の外部印加装置が必要である。(b) Background of the technology Magneto-optical recording devices such as magneto-optical disks are capable of recording by applying a constant magnetic field to the medium and then irradiating the medium with a Remza light shade to heat the medium to a temperature of one Curve or higher. Information is recorded or erased by directing the direction of magnetization remaining in the medium to the direction of magnetization of the applied magnetic field. When recording and erasing this information, an external application device is required to place the vicinity of the light spot formed on the medium in a constant magnetic field in opposite directions during recording and erasing.
（ｅ） 従来技術と問題点
従来はこのために、第１図に示すような前記光スポット
を形成する−ための対物レンズ１のまわシにソレノイド
コイル２を設置する方法がとられて−きた。なお、３は
対物レンズ１とソレノイドコイル２を有する光ヘッド、
４は媒体、５は媒体４を回転させるスピンドルを示す。(e) Prior Art and Problems Conventionally, for this purpose, a method has been adopted in which a solenoid coil 2 is installed around the objective lens 1 to form the light spot as shown in FIG. . Note that 3 is an optical head having an objective lens 1 and a solenoid coil 2;
4 indicates a medium, and 5 indicates a spindle for rotating the medium 4.
しか１−ながらこの方法では、印加すべき磁界が２００
〜３０００′ｅという大きな磁界をかけねばならない上
に、内部に光スポットを得るための対物レンズ１を収め
るため、空心ソレノイドとならざるヲ得す、ソレノイド
コイル２の大型化（重ｔ）化）。However, in this method, the magnetic field to be applied is 200
In addition to having to apply a large magnetic field of ~3000'e, the objective lens 1 for obtaining a light spot is housed inside, so it is not possible to use an air-centered solenoid, and the solenoid coil 2 becomes larger (heavier). .
高発熱化をまねくとり問題があった。There was a problem in that it caused high heat generation.
（ｄ） 発明の目的
本発明は上記のような問題を除去するため、媒体を挾ん
でｙＣ学ヘッドと対向する位置に、磁（但。(d) Purpose of the Invention In order to eliminate the above-mentioned problems, the present invention provides a magnetic head (provided that a magnetic head is placed between the media and facing the YC head).
永久磁石よりなる磁気回路？： ４ｉｔ成し、その磁気
回路全体を移１１１ ′する）Ｊ法で磁場の向きを切シ
（３えることにより、光学ヘットの小’Ｃ）牲Ｊｔｔ４
化、低発熱化するようにした光■淑＜％ｔ、ディスク装
置ｉ？を提供することを１（白としてい７、。A magnetic circuit made of permanent magnets? : By changing the direction of the magnetic field using the J method (by changing the optical head's small 'C'), the entire magnetic circuit is transferred.
optical system with low heat generation and low heat generation, disk device i? 1 (as white and 7,).
（ｅｌ 発明の構成
そしてこの目的は本発明によれば、記録４１１１体に一
定畷界を印加しつつレーザ′Ｈを光ｉ９とする光ビーム
を照射し、熱磁気作用によ多情報の記録もしくは消去全
行う光磁気ディスク装置において、前記紀１唖葆体Ｆに
光スポットを形成するための光学系を収めた光学ヘッド
と、該記録媒体を挾んで対向し、該光学ヘッドの走査領
域を覆うようなＡ。According to the present invention, the structure and purpose of the invention is to apply a constant field to the recording body 4111, irradiate the laser 'H with a light beam of light i9, and record or record a large amount of information by thermomagnetic action. In a magneto-optical disk device that performs full erasing, an optical head containing an optical system for forming a light spot on the first blank body F faces the recording medium with the recording medium in between, and covers the scanning area of the optical head. Like A.
Ｂ二つの磁極と該磁極の間にあって、該磁極に磁場を与
える永久磁石よ多構成された磁気回路と該磁気回路全体
を移動させる駆動装置とを有し、情報の記録の場合と消
去の場合で前記光ビームと対向する磁極をＡ、Ｂいずれ
かに該駆動装置により切シ換えることを特徴とする光磁
気ディスク装置を提供することにより達成される。B: It is located between two magnetic poles and has a magnetic circuit composed of multiple permanent magnets that apply a magnetic field to the magnetic poles, and a drive device that moves the entire magnetic circuit, and is used for recording and erasing information. This is achieved by providing a magneto-optical disk device characterized in that the magnetic pole facing the light beam is switched between A and B by the drive device.
（ｆ） 発明の実施例 以下、本発明の実椀例を図面によシ詳述する。(f) Examples of the invention Hereinafter, practical examples of the present invention will be explained in detail with reference to the drawings.
第２図は本発明の光磁気ディスク装置の一実施例７示す
斜視図でちる。FIG. 2 is a perspective view showing a seventh embodiment of the magneto-optical disk device of the present invention.
図において、１は焦点を結ぶための対物レンズ、３は光
学ヘッドで焦点合せ磯栴を有し、常に媒体４１に焦点を
結ぶようにレーザ光全照射する。また光学ヘッド３は矢
印ａの方向に移動し、媒体４の任意の場所で情報の記θ
、打生、消去を行う。In the figure, numeral 1 is an objective lens for focusing, and 3 is an optical head having a focusing lens, and irradiates the entire laser beam so that the medium 41 is always focused. Further, the optical head 3 moves in the direction of arrow a and records information θ at any location on the medium 4.
, beat, and erase.
一方、６，７は光学ヘッド３と対向するように設置され
た磁極でちシ、光学ヘッド３の移動する方向に、その移
動範囲を金片カバーするだ０の長さ金有している。そし
て、磁極６，７けその間に挾寸れた永久磁石８と共に、
図中点紳で示した様な磁気回路ｔ−構成している。また
、９はｉ気回路全体ｆ ；ＩＪ ｉｌ）させろための駆
１４ＩＪ装置（ソレノイド等）である。On the other hand, 6 and 7 are magnetic poles installed to face the optical head 3, and have a length of metal that covers the movement range of the optical head 3 in the direction in which the optical head 3 moves. And, together with the permanent magnet 8 sandwiched between the magnetic poles 6 and 7,
The magnetic circuit is constructed as shown by the dot in the figure. Further, 9 is a drive 14 IJ device (such as a solenoid) for controlling the entire i-air circuit f ; IJ il).
媒体４上に情＼１（の記録を行う場合、光学ヘッド３全
所定場所に移動するとともに、駆動装置６により磁気回
路全体（磁極６，７、永久磁石８）を例えば第３１シ］
（イ）に示す状態に移動し、レーザ光の照射によりＵ体
４に下向きの磁化をする。When recording information on the medium 4, the entire optical head 3 is moved to a predetermined location, and the entire magnetic circuit (magnetic poles 6, 7, permanent magnet 8) is moved by the drive device 6 to the 31st column, for example.
The U body 4 is moved to the state shown in (a), and the U body 4 is magnetized downward by laser beam irradiation.
次に媒体４上の情報の消去を行う場合、光学ヘッド３を
肋定堝所に移動するとともに、駆動装置９により磁気回
路全体を、例えば第３図（＋＝１に示す状態に移動し、
レーザ光の照射によシ媒体４上に上向きの磁化をする。Next, when erasing information on the medium 4, the optical head 3 is moved to a mounting location, and the entire magnetic circuit is moved by the drive device 9 to the state shown in FIG. 3 (+=1), for example.
By irradiating the laser beam, the medium 4 is magnetized upward.
上記のようにして媒体４への情報の記録、消去が行える
が、このときの磁化反転のための駆動装置９による磁気
回路全体の横方向への移動は極く僅か（実施例では４〜
１０讃程度）でよ（、短時間に磁場の向きが反転される
。Information can be recorded and erased on the medium 4 as described above, but at this time, the movement of the entire magnetic circuit in the lateral direction by the drive device 9 for magnetization reversal is extremely small (in the embodiment, 4 to 4
The direction of the magnetic field is reversed in a short time.
又外部ｖＡＪＡ印加のための装置が、永久磁石６゜磁極
７よ多構成され、光学ヘッド３とは媒体４０反対側にあ
るので、従来のような光学ヘッド３にソレノイドコイル
２がないのでヘッドの小型軽量化が実現で作る。又永久
磁石８を用臂て磁場を形成するため、従来のソレノイド
コイル２のようなコイル発熱の問題がない０さらに又、
一定磁界印加のために単にコイル又は磁石を媒体４に近
づけて配置したのではエアーギャップは大きいが、本発
明の磁極６，７である継鉄によシェアーギャップを小さ
くできるので、磁気回路の効率が高くなる０
＜ｇ） 発明の効果
以上詳細に洋間したように、本発明の光磁気ディスク装
置は媒体を挾んで光学ヘッドと対向する位置に、磁極、
永久磁石よシなる磁気回路ｔ−構成し、その磁気回路全
体全駆動装置によシ移動して磁場の向きを切シ換えるこ
とによシ、従来のような光学ヘッドにソレノイドコイル
がないので、光学ヘッドの小型杆部化と低発熱化が計れ
る効果がある。さらに、磁極により磁気回路のエアーギ
ャップは小さくでき、効率の高い磁気口ｍが設計できる
。In addition, the device for external vAJA application is composed of a permanent magnet 6° and magnetic pole 7, and is located on the opposite side of the medium 40 from the optical head 3, so that the solenoid coil 2 is not provided in the optical head 3 as in the conventional case. The product is made smaller and lighter. In addition, since the magnetic field is created using the permanent magnet 8, there is no problem of coil heat generation unlike the conventional solenoid coil 2.
If the coil or magnet were simply placed close to the medium 4 to apply a constant magnetic field, the air gap would be large, but the yoke, which is the magnetic poles 6 and 7 of the present invention, can reduce the shear gap, which improves the efficiency of the magnetic circuit. 0<g) Effects of the Invention As described in detail above, the magneto-optical disk device of the present invention has a magnetic pole, a magnetic pole,
The magnetic circuit consists of a permanent magnet, and the entire magnetic circuit is moved by a driving device to change the direction of the magnetic field.Since there is no solenoid coil in the conventional optical head, This has the effect of making the optical head smaller and generating less heat. Furthermore, the air gap of the magnetic circuit can be made small by the magnetic poles, and a highly efficient magnetic opening m can be designed.
第１図は従来の光磁気ディスク装置を説明する斜視図、
第２図は本発明の磁気ディスク装置の一実施例を示す斜
視図、第３図（イ）、（ロ）は本発明の記録、消去の時
の外部磁場の向きの反転を説明するための図である。
図において、ｌは対物レンズ、３は光学ヘッド、４は媒
体、６，７は磁極、８は永久磁石、９は駆動装置ケ示す
ｎFIG. 1 is a perspective view illustrating a conventional magneto-optical disk device.
FIG. 2 is a perspective view showing an embodiment of the magnetic disk device of the present invention, and FIGS. 3(A) and 3(B) are diagrams for explaining the reversal of the direction of the external magnetic field during recording and erasing of the present invention. It is a diagram. In the figure, l is an objective lens, 3 is an optical head, 4 is a medium, 6 and 7 are magnetic poles, 8 is a permanent magnet, and 9 is a drive device.
Claims (1)
る光ビームを照射し、熱磁気作用により情報の記録もし
くは消去を行う光磁気ディスク装置ｊ、において、前記
記伜媒体上に光スポットを形成するための光学系を収め
た光学ヘッドと、該記録媒体を挾んで対向し、該光学ヘ
ッドの走査領域を校うようなＡ、Ｂ二つの磁極と該磁極
の間にあって、該磁極に磁場を′与える永久磁石よ多構
成された磁気回路と該磁気回路全体を移動させる駆動装
置１１とを有し、情報の記録の場合と、消去の場合で前
記光ビームと対向する磁極をＡ、Ｂいずれかに該駆動装
置により切υ換えることを特徴とする光磁気ディスク装
置。In a magneto-optical disk device j that records or erases information by thermomagnetic action by applying a constant magnetic field to a recording medium and irradiating a light beam from a laser or the like as a light source, a light spot is formed on the recording medium. An optical head containing an optical system for forming a recording medium, and two magnetic poles A and B that face each other with the recording medium in between and calibrate the scanning area of the optical head, and a magnetic field is applied to the magnetic pole. It has a magnetic circuit made up of a number of permanent magnets that give 0 and a drive device 11 that moves the entire magnetic circuit, and the magnetic poles facing the light beam are set to A and B in the case of recording and erasing information. A magneto-optical disk device characterized in that the drive device switches between the two modes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11925983A JPS6010401A (en) | 1983-06-30 | 1983-06-30 | Optical magnetic disc device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11925983A JPS6010401A (en) | 1983-06-30 | 1983-06-30 | Optical magnetic disc device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6010401A true JPS6010401A (en) | 1985-01-19 |
| JPH0370846B2 JPH0370846B2 (en) | 1991-11-11 |
Family
ID=14756900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11925983A Granted JPS6010401A (en) | 1983-06-30 | 1983-06-30 | Optical magnetic disc device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6010401A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61121523U (en) * | 1985-01-17 | 1986-07-31 | ||
| US4914643A (en) * | 1986-11-20 | 1990-04-03 | Ricoh Company, Ltd. | Overwriting photomagnetic recording apparatus having single light source and fixed-field generator |
| EP0380708A1 (en) * | 1988-08-11 | 1990-08-08 | Nikon Corporation | Overwrite type magnetooptical recording apparatus |
| JPH02105201U (en) * | 1989-02-02 | 1990-08-21 | ||
| JPH0315404U (en) * | 1989-06-29 | 1991-02-15 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5724047A (en) * | 1980-07-21 | 1982-02-08 | Matsushita Electric Ind Co Ltd | Recorder and reproducer |
-
1983
- 1983-06-30 JP JP11925983A patent/JPS6010401A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5724047A (en) * | 1980-07-21 | 1982-02-08 | Matsushita Electric Ind Co Ltd | Recorder and reproducer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61121523U (en) * | 1985-01-17 | 1986-07-31 | ||
| US4914643A (en) * | 1986-11-20 | 1990-04-03 | Ricoh Company, Ltd. | Overwriting photomagnetic recording apparatus having single light source and fixed-field generator |
| EP0380708A1 (en) * | 1988-08-11 | 1990-08-08 | Nikon Corporation | Overwrite type magnetooptical recording apparatus |
| JPH02105201U (en) * | 1989-02-02 | 1990-08-21 | ||
| JPH0315404U (en) * | 1989-06-29 | 1991-02-15 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0370846B2 (en) | 1991-11-11 |
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