JPH0249202A - Magnetic bias device for magneto-optical disk - Google Patents
Magnetic bias device for magneto-optical diskInfo
- Publication number
- JPH0249202A JPH0249202A JP19795488A JP19795488A JPH0249202A JP H0249202 A JPH0249202 A JP H0249202A JP 19795488 A JP19795488 A JP 19795488A JP 19795488 A JP19795488 A JP 19795488A JP H0249202 A JPH0249202 A JP H0249202A
- Authority
- JP
- Japan
- Prior art keywords
- piece
- rotating piece
- driving piece
- spur gear
- recording
- 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
- 230000005415 magnetization Effects 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000005381 magnetic domain Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000005374 Kerr effect Effects 0.000 description 1
- 239000011521 glass Substances 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
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10556—Disposition or mounting of transducers relative to record carriers with provision for moving or switching or masking the transducers in or out of their operative position
- G11B11/1056—Switching or mechanically reversing the magnetic field generator
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、光磁気ディスクの磁気バイアスに関するもの
である。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic bias for a magneto-optical disk.
（従来の技術）
近年の光磁気ディスクの磁気バイアスにおいては、光学
ピックアップから照射されるレーザビームを媒体面で直
径１μｍ程度に絞り込んで、媒体面を局部的にキューり
点まで昇温させ、このレーザビーム照射部の垂直磁化の
保磁力を減少させて、反射面に配置した外部磁界によっ
て一定の磁化状態にする。このように、磁気バイアスか
らの磁界の方向によって垂直磁化の磁区を配列させ、磁
区の配列方向の変化によって情報の′？２録を行うもの
である。(Prior art) In the magnetic bias of recent magneto-optical disks, the laser beam irradiated from an optical pickup is narrowed down to a diameter of about 1 μm on the medium surface, and the temperature of the medium surface is locally raised to the cue point. The coercive force of the perpendicular magnetization of the laser beam irradiation section is reduced to maintain a constant magnetization state by an external magnetic field placed on the reflective surface. In this way, the magnetic domains of perpendicular magnetization are arranged according to the direction of the magnetic field from the magnetic bias, and the change in the arrangement direction of the magnetic domains causes information to be changed. This is the second recording.
このように、垂直に磁区が配向した媒体面にし−ザを収
束させ照射すると、レーザの偏波面が磁区の方向により
カー効果で微小角回転するので、記録膜からの反射光の
偏波面を検出することにより、記録された情報を再生す
ることができる。−方、記録された情報の消去は、記録
時と同様の方法で消去すべき領域の磁区をシステムで定
められた一定の方向に配列し直すことにより達成するこ
とができる。情報の記録と消去とでは、磁界の極性は逆
でなくてはならない。ここで、磁気バイアスとしては電
磁石が多く用いられているが、光ピックアップの移動と
共に電磁石も記録媒体上の所定位置にアクセスする移動
型電磁石と、記録領域全体をカバーする固定型電磁石タ
イプのものとに大別できる。第３図は従来の固定型電磁
石磁気バイアスの断面図で、この１゛ヒ磁のコイル２１
によってヨーク２２が磁化されて磁力線が出るが、媒体
面との距離が短かければ（例えば０．５〜１．０ｍ程度
）、小型で効率のよい磁気バイアスが得られる。In this way, when a laser is focused and irradiated onto a medium surface with vertically oriented magnetic domains, the polarization plane of the laser rotates by a small angle due to the Kerr effect depending on the direction of the magnetic domains, so the polarization plane of the reflected light from the recording film can be detected. By doing so, recorded information can be reproduced. - On the other hand, erasing of recorded information can be achieved by rearranging the magnetic domains in the area to be erased in a certain direction determined by the system in the same manner as during recording. The polarity of the magnetic field must be opposite when recording and erasing information. Here, electromagnets are often used as the magnetic bias, but there are two types: a moving electromagnet, which accesses a predetermined position on the recording medium as the optical pickup moves, and a fixed electromagnet, which covers the entire recording area. It can be broadly divided into Figure 3 is a cross-sectional view of a conventional fixed electromagnet magnetic bias.
The yoke 22 is magnetized and lines of magnetic force are produced, but if the distance to the medium surface is short (for example, about 0.5 to 1.0 m), a small and efficient magnetic bias can be obtained.
（発明が解決しようとする課題）
しかし、現状ではディスクの媒体面を保護するために、
厚さ１．２ｍのガラスまたはプラスチックを貼り合わせ
ているため、電磁石を機構的にカートリッジの中に挿入
し、ディスクの面に近接させても、その距離は２．２〜
２．６−程度であり、媒体面に記録と消去に必要なバイ
アス磁界を効果的に加えるためには、温度上昇も含めれ
ば大型化してしまい、小型化を目的とする光磁気ディス
クとしては不適当な磁気バイアスの構造になってしまう
。(Problem to be solved by the invention) However, at present, in order to protect the media surface of the disc,
Since the glass or plastic is bonded together with a thickness of 1.2 m, even if the electromagnet is mechanically inserted into the cartridge and brought close to the disk surface, the distance is 2.2 ~
2.6 -, and in order to effectively apply the bias magnetic field necessary for recording and erasing to the medium surface, if temperature rise is included, the size will increase, making it unsuitable for a magneto-optical disk aimed at miniaturization. This results in a structure with an appropriate magnetic bias.
本発明の目的は、従来の欠点を解消し、記録。The purpose of the present invention is to overcome the drawbacks of the conventional record.
消去時における記録領域半径方向をカバーでき、かつ小
型軽量化のできる磁気バイアスを提供することである。It is an object of the present invention to provide a magnetic bias that can cover the recording area in the radial direction during erasing and can be made smaller and lighter.
（課題を解決するための手段）
本発明の光磁気ディスク用磁気バイアス装ｊｉｔは、レ
ーザ光の照射と外部バイアス磁界の印加によって記録、
再生、消去が行われる光磁気ディスクの磁気バイアスに
おいて、記録媒体の記録領域をカバーし、光ピックアッ
プのレーザ収束位置と記録媒体を挟んで相対する位置に
、記録領域と平行でかつ半径方向に沿って配置された一
つの永久磁石と、この永久磁石を記録、消去時とで磁化
の方向を反転できるように保持された回転片に係合させ
。(Means for Solving the Problems) The magnetic bias device jit for a magneto-optical disk of the present invention performs recording and recording by irradiating laser light and applying an external bias magnetic field.
In the magnetic bias of the magneto-optical disk that is used for reading and erasing, it covers the recording area of the recording medium, and is parallel to the recording area and along the radial direction at a position opposite to the laser convergence position of the optical pickup with the recording medium in between. One permanent magnet is placed in the same position as shown in FIG.
この回転片の一端には平歯車が設けられ、この回転片を
媒体と平行平面上に回転可能に保持する部材と、この回
転片の平歯車部と噛み合うように配置されたラックを有
する駆動片と、この駆動片は少なくとも一つのガイド軸
によって保持され、この駆動片にはリニアモータのコイ
ルを有し、リニアモータのヨークにはめ合わされ、この
駆動片の移動によってラックと係合している回転片の平
歯車を回転させ、所定の磁場を与えるものである。A driving piece having a spur gear provided at one end of the rotating piece, a member that rotatably holds the rotating piece on a plane parallel to the medium, and a rack arranged to mesh with the spur gear of the rotating piece. This drive piece is held by at least one guide shaft, and this drive piece has a coil of a linear motor, and is fitted into the yoke of the linear motor, and the movement of this drive piece causes rotation engaging with the rack. It rotates one spur gear to apply a predetermined magnetic field.
（作 用）
上記構成によって、バイアス磁界を印加する磁気バイア
ス機構が小型化されることとなる。(Function) With the above configuration, the magnetic bias mechanism that applies a bias magnetic field can be miniaturized.
（実施例）
本発明の一実施例を第１図および第２図に法づいて説明
する。(Example) An example of the present invention will be described with reference to FIGS. 1 and 2.
第１図は、本発明の光磁気ディスク用磁気バイアス装置
の斜視図である。同図において、磁気バイアスは磁界発
生素子である永久磁石１によって成り、円筒型の回転片
２は長方形の孔を有し、その孔に永久磁石１を固着する
。回転片２の一端には平歯車３が形成されている。駆動
片４にはラック歯車５を有し１回転片２の平歯車３と係
合している。回転片２は１回転片保持片６．６′によっ
て回転可能に保持されている。駆動片４にはリニアモー
タ用コイル７がはめ込まれている。また、ガイド軸を通
す孔８，８′を有し、この孔８，８′にガイド軸９，１
０を通し、駆動片４を保持する。FIG. 1 is a perspective view of a magnetic bias device for a magneto-optical disk according to the present invention. In the figure, the magnetic bias is made up of a permanent magnet 1 which is a magnetic field generating element, and a cylindrical rotating piece 2 has a rectangular hole, into which the permanent magnet 1 is fixed. A spur gear 3 is formed at one end of the rotating piece 2. The drive piece 4 has a rack gear 5 and engages with the spur gear 3 of the one-rotation piece 2. The rotating piece 2 is rotatably held by a single rotating piece holding piece 6.6'. A linear motor coil 7 is fitted into the drive piece 4. It also has holes 8, 8' through which the guide shafts pass, and guide shafts 9, 1 are inserted into these holes 8, 8'.
0 and hold the drive piece 4.
また、ｙｊＡ動片４のリニアモータ用コイル７の中空部
にリニアモータのヨーク１１がはめ込まれ、固定されて
いる。また、ガイド軸９，１０の両端は、位置決め台１
２．１２’と固定片１３．１３’によって固定されてい
る。駆動片４のコイルに通電することにより、駆動片４
が動き、ラック歯車５のラック部と係合している回転片
２の平歯車３を廻し１回転片２に取り付いた永久磁石１
の磁場発生位置を変えることができろ。磁場の極性はシ
ステムで定められた方向に向けることにより、記録、消
去を行うことができる。これは、駆動片のコイルに通電
する極性を変えることにより達せられる。Further, the yoke 11 of the linear motor is fitted into the hollow part of the linear motor coil 7 of the yjA moving piece 4 and is fixed. Further, both ends of the guide shafts 9 and 10 are connected to the positioning base 1.
2.12' and fixed piece 13.13'. By energizing the coil of the drive piece 4, the drive piece 4
moves, turning the spur gear 3 of the rotating piece 2 that is engaged with the rack part of the rack gear 5, and the permanent magnet 1 attached to the rotating piece 2 rotates.
Can you change the position where the magnetic field is generated? Recording and erasing can be performed by directing the polarity of the magnetic field in a direction determined by the system. This is achieved by changing the polarity of energizing the coil of the drive piece.
第２図（ａ）は記録時の永久磁石の位置を示し、Ｓ極の
磁場が垂直にディスク１４の記録媒体１５に印加される
ことがわかる。FIG. 2(a) shows the position of the permanent magnet during recording, and it can be seen that the magnetic field of the S pole is applied perpendicularly to the recording medium 15 of the disk 14.
第２図（ｂ）は消去時の永久磁石の位置を示す。FIG. 2(b) shows the position of the permanent magnet during erasing.
ただし、この場合、配列はシステムの関係からで逆方向
でもよい。However, in this case, the arrangement may be in the opposite direction depending on the system.
以上の構成により、機構的に簡単で、磁気バイアス自体
の小型化も図ることができる６（発明の効果）
本発明によれば、光磁気ディスクの磁気バイアスは小型
化することができ、それによって小型の光磁気ディスク
を提供することが可能となり、その実用上の効果は大で
ある。With the above configuration, it is mechanically simple and the magnetic bias itself can be miniaturized.6 (Effects of the Invention) According to the present invention, the magnetic bias of the magneto-optical disk can be miniaturized. It becomes possible to provide a small-sized magneto-optical disk, which has great practical effects.
第１図は本発明の一実施例における光磁気ディスク用磁
気バイアス装置の斜視図、第２図は同記録、消去時の永
久磁石の位置を示す正面図、第３図は従来の電磁石型磁
気バイアスの断面斜視図である。
１・・・永久磁石、 ２・・回転片、 ３・・・平歯車
、 ４・・・駆動片、 ５・・・ラック歯車、６．６′
・・・回転片保持片、 ７・・・リニアモータ用コイル
、 ８，８′・・・孔、 ９，１０・・・ガイド軸、１
１・・・リニアモータ用ヨーク、１２、１２’・・・位
置決め台、 １３．１３’・・・固定片、１４・・・デ
ィスク、 １５・・・記録媒体。
特許出願人 松下電器産業株式会社
１、、、永久磁石
５、−ラ・・７り簡単
第１図
２−°口転乃 ３−千市阜 ４−０駆杓乃６．６’
−８ロ転乃イ呆持乃 ７−０．リニアモータ用コイル
第２図
（ａ）
（ｂ）
１４ 、、、テ゛イ入ワ ７５−１δこ録楳体第３図
８８′
１２．１２Fig. 1 is a perspective view of a magnetic bias device for a magneto-optical disk according to an embodiment of the present invention, Fig. 2 is a front view showing the position of the permanent magnet during recording and erasing, and Fig. 3 is a conventional electromagnet-type magnetic bias device. FIG. 3 is a cross-sectional perspective view of a bias. 1... Permanent magnet, 2... Rotating piece, 3... Spur gear, 4... Drive piece, 5... Rack gear, 6.6'
... Rotating piece holding piece, 7... Linear motor coil, 8, 8'... Hole, 9, 10... Guide shaft, 1
DESCRIPTION OF SYMBOLS 1... Yoke for linear motor, 12, 12'... Positioning stand, 13.13'... Fixing piece, 14... Disk, 15... Recording medium. Patent applicant: Matsushita Electric Industrial Co., Ltd.
-8 Rotennoi Bumochino 7-0. Coil for linear motor Fig. 2 (a) (b) 14 , 75-1δ Recording plate Fig. 3 88' 12.12
Claims (1)
、再生、消去が行われる光磁気ディスクの磁気バイアス
において、記録媒体の記録領域をカバーし、光ピックア
ップのレーザ収束位置と前記記録媒体を挟んで相対する
位置に、前記記録領域と平行でかつ半径方向に沿って配
置された一つの永久磁石と、前記永久磁石を記録、消去
時とで磁化の方向を反転できるように保持された回転片
に係合させ、前記回転片の一端には平歯車が設けられ、
前記回転片を媒体と平行平面上に回転可能に保持する部
材と、前記回転片の平歯車部と噛み合うように配置され
たラックを有する駆動片と、前記駆動片は少なくとも一
つのガイド軸によって保持され、前記駆動片にはリニア
モータのコイルを有し、リニアモータのヨークにはめ合
わされ、前記駆動片の移動によってラックと係合してい
る前記回転片の平歯車を回転させ、所定の磁場を与える
ことを特徴とする光磁気ディスク用磁気バイアス装置。In the magnetic bias of a magneto-optical disk, where recording, reproduction, and erasing are performed by irradiating a laser beam and applying an external bias magnetic field, the recording area of the recording medium is covered, and the laser convergence position of the optical pickup is positioned relative to the recording medium across the recording medium. a permanent magnet arranged parallel to the recording area and along the radial direction; and a rotating piece held so that the direction of magnetization of the permanent magnet can be reversed during recording and erasing. a spur gear is provided at one end of the rotating piece;
a member for rotatably holding the rotating piece on a plane parallel to the medium; a driving piece having a rack arranged to mesh with a spur gear portion of the rotating piece; and the driving piece is held by at least one guide shaft. The driving piece has a coil of a linear motor, and is fitted into the yoke of the linear motor, and the movement of the driving piece rotates the spur gear of the rotating piece that is engaged with the rack, thereby applying a predetermined magnetic field. 1. A magnetic bias device for a magneto-optical disk, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19795488A JPH0249202A (en) | 1988-08-10 | 1988-08-10 | Magnetic bias device for magneto-optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19795488A JPH0249202A (en) | 1988-08-10 | 1988-08-10 | Magnetic bias device for magneto-optical disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0249202A true JPH0249202A (en) | 1990-02-19 |
Family
ID=16383072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19795488A Pending JPH0249202A (en) | 1988-08-10 | 1988-08-10 | Magnetic bias device for magneto-optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0249202A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5228460A (en) * | 1991-12-12 | 1993-07-20 | Philip Morris Incorporated | Low mass radial array heater for electrical smoking article |
-
1988
- 1988-08-10 JP JP19795488A patent/JPH0249202A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5228460A (en) * | 1991-12-12 | 1993-07-20 | Philip Morris Incorporated | Low mass radial array heater for electrical smoking article |
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