JPS6332755A - Magneto-optical head - Google Patents
Magneto-optical headInfo
- Publication number
- JPS6332755A JPS6332755A JP17558686A JP17558686A JPS6332755A JP S6332755 A JPS6332755 A JP S6332755A JP 17558686 A JP17558686 A JP 17558686A JP 17558686 A JP17558686 A JP 17558686A JP S6332755 A JPS6332755 A JP S6332755A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- magnetic field
- permanent magnet
- optical head
- lens
- 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
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- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims 1
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000005415 magnetization Effects 0.000 description 4
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000015654 memory Effects 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 102100030551 Protein MEMO1 Human genes 0.000 description 1
- 101710176845 Protein MEMO1 Proteins 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 230000004044 response Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 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
- G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
-
- 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
- G11B11/10532—Heads
-
- 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
- G11B11/10552—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、誉き換え可能な光磁気ディスクに、情報の記
録、再生あるいは消去を行う光磁気ヘッドに嘴する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention is applied to a magneto-optical head for recording, reproducing or erasing information on a rewritable magneto-optical disk.
（従来の技術）
従来、高密度・大容量のメモリとしてＩ）ＲＡＷ型の元
ディスク（記録媒体）が盛んに研究開発された。この光
ディスクの研究開発と並行して、当然装置の開発も成さ
れたが、とりわけ装置側の高筐度・大容量化の一端を担
うものは光学ヘッドである。つまシ光学ヘッドがメモリ
としての価値を決定すると云っても過言ではない。(Prior Art) Conventionally, RAW type source disks (recording media) have been actively researched and developed as high-density, large-capacity memories. In parallel with this research and development of optical discs, equipment was naturally developed, but the optical head was particularly responsible for increasing the size and capacity of the equipment. It is no exaggeration to say that the optical head determines the value of a memory.
この光学ヘッドには、例えば
■特開昭５８−１２１４５号公報に見られるような対物
レンズに永久磁石を一体的に固着し、この永久磁石の回
りに配置したコイルに通電することにより、トラッキン
グあるいはフォーカスを行うものや。In this optical head, a permanent magnet is integrally fixed to the objective lens as seen in Japanese Patent Application Laid-Open No. 58-12145, and by energizing a coil arranged around the permanent magnet, tracking or Something to focus on.
■特開昭５９−２２１８３９号公報に見られるような、
永久磁石を台に固定し、コイルを対物レンズに接着し、
コイルに通電することにより、上記公報と同様トラッキ
ングあるいはフォーカスを行うものなどがある。■As seen in Japanese Unexamined Patent Publication No. 59-221839,
Fix the permanent magnet on the stand, glue the coil to the objective lens,
There is a device that performs tracking or focusing by energizing a coil, as in the above-mentioned publication.
ところが、これらの光学ヘッドが用いられるＤＲＡＷ型
の元ディスクは、周知の叩く、一度書き込まれた情報は
沓き替えができない。しかし、光ディスクの有効利用の
而からすると不要となって情報は消去できることが望ま
しい。However, in the DRAW-type source disks in which these optical heads are used, the information once written cannot be replaced. However, from the point of view of effective use of optical discs, it is desirable that information can be erased when it becomes unnecessary.
そこで、現在、情報の書き換えが可能な記録媒体として
、光磁気ディスク（以下、単にディスクと称す。）がそ
の有効性から特に注目を浴びている。以下に、このディ
スクについて簡単に説明する。Therefore, magneto-optical disks (hereinafter simply referred to as disks) are currently attracting particular attention as a recording medium in which information can be rewritten due to their effectiveness. This disc will be briefly explained below.
このディスクへの情報信号の記録は、通常５０００ｅ以
下の外部磁界のもとでレーザ光を１μｍφ１％度の微小
スポット光に絞り込んで局所的に記録媒体である磁性体
薄膜の温度を上げ、その部分の磁化を該外部磁界の方向
に変化させることによって行っている。また情報信号の
消去は、記録時とは逆方向の外部磁界を印加することに
より上記と同機に行う。情報の再生は、記録媒体に直線
偏光のレーザ光を照射し、磁化反転した領域と磁化反転
していない領域とで、そこからのレーザ光の反射光や透
過光の偏光方向が異なることを利用して行うものである
。Information signals are recorded on this disk by narrowing the laser beam into a tiny spot of 1 μm diameter and 1% degree under an external magnetic field of 5000 e or less to locally raise the temperature of the magnetic thin film that is the recording medium. This is done by changing the magnetization of the magnetic field in the direction of the external magnetic field. Also, erasing of the information signal is performed in the same manner as described above by applying an external magnetic field in the opposite direction to that during recording. Information is reproduced by irradiating a recording medium with linearly polarized laser light, and taking advantage of the fact that the polarization directions of the reflected and transmitted laser light differ between regions where the magnetization has been reversed and regions where the magnetization has not been reversed. This is done by doing so.
以上からも分るように、ディスク上に情報の記録・消去
を行うには、レーザ光（熱付与）とは別に外部磁界が必
要である。このため外部磁界を発生させる手段としては
、例えば第７図に示すように、ディスク３００を挾んで
上記■■の如く光学ヘッド６０１と対向する位ｆｉｔ
ＶＣｆｉかれた永久磁石６００又は図示しない電磁石な
どが用いられている。As can be seen from the above, in order to record and erase information on a disk, an external magnetic field is required in addition to laser light (heat application). Therefore, as a means for generating an external magnetic field, for example, as shown in FIG.
A VCfi permanent magnet 600 or an electromagnet (not shown) is used.
しかしながら、通常、情報の記録あるいは消去時の外部
磁界強度は一定であることが望ましいが。However, it is usually desirable that the external magnetic field strength be constant when recording or erasing information.
ディスクの回転に伴ってディスク３００が上下（面販れ
）すると、このディスク３００と外部磁界印加手段であ
る永久磁石６００との距離が変化し、ディスク３００上
での外部磁界強度が変動する。When the disk 300 moves up and down (sales) as the disk rotates, the distance between the disk 300 and the permanent magnet 600, which is an external magnetic field applying means, changes, and the external magnetic field strength on the disk 300 changes.
外部磁界強度の変動は記録ピッドの太さ烙あるいは、・
自失トラック幅が変化を引き起こし、情報信号の品質ひ
いてはディスク装置゛ａの信幀性が損われるという欠点
七ゼしていた。例えばこのディスクと外部磁界を印加す
る手段との距離を犬きくすることも考えられるが、その
分磁界印加装置が大きくなり電磁石の場合には発熱も問
題となり実用性を欠くものとなる。Fluctuations in the external magnetic field strength are caused by the thickness of the recording pit or
The disadvantage is that the lost track width causes variations, which impairs the quality of the information signal and thus the reliability of the disk drive. For example, it is conceivable to increase the distance between this disk and the means for applying an external magnetic field, but this would make the magnetic field applying device larger and, in the case of an electromagnet, generate heat, making it impractical.
さらに、第７図において説明したように外部磁界を印加
する永久磁石６００等がディスク３００を挾んで光学ヘ
ッド６０１と対向する位ｉｆに配置されているためディ
スク３００のコーディング機構が複雑となるはかりでな
く、永久磁石６００光学ヘツド６０１とを含めた光磁気
ヘッドの大きさが壇太し、装置が大型化・浮型化してし
１う。その上、外部磁界を印加する手段の設計に当だっ
ては、光学ヘッド内のフを一カシングおよびトラッキン
グ駆動系磁気回路との磁気的干渉をも考慮しなければな
らないという問題があった。Furthermore, as explained with reference to FIG. 7, the permanent magnet 600 for applying an external magnetic field is placed at a position if which sandwiches the disk 300 and faces the optical head 601, so the coding mechanism for the disk 300 is complicated. Therefore, the size of the magneto-optical head including the permanent magnet 600 and the optical head 601 increases, and the device becomes larger and more floating. Furthermore, when designing a means for applying an external magnetic field, there is a problem in that magnetic interference with the magnetic circuit of the tracking drive system and the fusing in the optical head must also be taken into consideration.
（発明が解決しようとする問題点）
上述したように従来光磁気ディスクの分野において、０
面振れに伴う外部磁界の変動によって引き起こす情報信
号の品質の低下、■外部磁界による光学ヘッド内の回路
の磁気的干渉、しかも■装置の大型化・４型化という櫨
々の問題があった。(Problems to be solved by the invention) As mentioned above, in the field of magneto-optical disks,
There were many problems: a reduction in the quality of the information signal caused by fluctuations in the external magnetic field due to surface wobbling; (1) magnetic interference of the circuits within the optical head due to the external magnetic field; and (2) an increase in the size and size of the device.
本発明は上記問題点に鑑みてなされたもので。The present invention has been made in view of the above problems.
その目的は、小型・薄型しかも信頼性の扁い光磁気ヘッ
ドを提供することにある。The purpose is to provide a magneto-optical head that is small, thin, and highly reliable.
（問題点を解決するための手段）
本発明はレーザ光の照射と磁界の印加とにより、情報の
記録あるいは消去が行える光磁気ディスク上に、レーザ
光を所定のスポット径に集光し、照射するレンズと、こ
のレンズに一体的に固着され、レーザ光の照射がなされ
る位置に磁界を印加する永久磁石と、この永久磁石の発
生する磁界と永久磁石の近傍に配置したコイルに流す電
流との相互作用によりレンズの光軸方向にレンズと永久
磁石を一体に駆動させ、レーザ光をフォーカシングする
ことにより情報の記録あるいは消去を行なう光磁気ヘッ
ドであって、この光磁気ヘッドが光磁気に対してフォー
カス状態にあるとき、永久磁石の磁界強度が、情報の記
録あるいは消去に必要な強度となり、かつ常に一定とな
るように設定されて成ることを特徴とする光磁気ヘッド
である。(Means for Solving the Problems) The present invention focuses a laser beam onto a magneto-optical disk on which information can be recorded or erased by irradiating it with a laser beam and applying a magnetic field, and irradiates the disk with a laser beam to a predetermined spot diameter. A permanent magnet that is integrally fixed to this lens and applies a magnetic field to the position where the laser beam is irradiated, and the magnetic field generated by this permanent magnet and the current that flows through a coil placed near the permanent magnet. A magneto-optical head records or erases information by driving a lens and a permanent magnet together in the direction of the optical axis of the lens and focusing laser light. This magneto-optical head is characterized in that the magnetic field strength of the permanent magnet is set so that when the magnetic head is in a focused state, the magnetic field strength of the permanent magnet becomes the strength necessary for recording or erasing information and is always constant.
（作 用）
以上からも明らかなように、光磁気ヘッド（レンズ）の
フォーカス、協動に応じて永久磁石が一体に駆動するた
め、光磁気ディスクの面振れ等に関係なく情報記録位置
での磁界強度が常に一定となる。(Function) As is clear from the above, since the permanent magnets are driven together in response to the focus and cooperation of the magneto-optical head (lens), the information recording position is maintained regardless of the surface runout of the magneto-optical disk. The magnetic field strength is always constant.
（実施例） 以下に、本発明の一冥施例を図面を参照して詳述する。(Example) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
第１図は本発明の第１の実施例ＶＣ係る光磁気ヘッドの
構造を示す図であり、（ａ）は上方から見た図、（ｂ）
は側面より見た図である。図示しないレーザ発振器から
のレーザ光は、集光レンズ１０１によりディスク上に所
定のスポット径に絞り込まれる。FIG. 1 is a diagram showing the structure of a magneto-optical head according to a first embodiment VC of the present invention, (a) is a view seen from above, (b)
is a side view. Laser light from a laser oscillator (not shown) is focused onto the disk by a condensing lens 101 to a predetermined spot diameter.
又この集光レンズ１０１は非磁性材料例えば＠Ｊ）Ｉ旨
材料からなる集光レンズホルダー１０２により保持され
ている。この集光レンズホルダー１０２の谷々の四面に
は集光レンズ１０１と一体に可動するように４個の永久
磁石１０３が固着されている。この永久−石１０３は本
実施例の特徴の１つをなしているもので、１つは、ディ
スクに、情報の記録あるいは消去に必要な外部磁界を印
加するためと、集光レンズ１０１から照射場れるレーザ
光のフォーカシング及びトラッキングを行なうためにそ
れぞれ対向する永久磁石１０３の同磁極面（図ではＳ極
）が互いに対向するように設けられている。この原理に
ついては後段で詳述する。Further, the condenser lens 101 is held by a condenser lens holder 102 made of a non-magnetic material, for example, a @J)I material. Four permanent magnets 103 are fixed to the four sides of the valley of the condenser lens holder 102 so as to be movable together with the condenser lens 101. This permanent stone 103 is one of the features of this embodiment. One is to apply an external magnetic field necessary for recording or erasing information to the disk, and to apply irradiation from the condenser lens 101. In order to perform focusing and tracking of the incident laser light, the opposing permanent magnets 103 are provided so that the same magnetic pole surfaces (S poles in the figure) are opposed to each other. This principle will be explained in detail later.
前記永久磁石１０３の材料は、例えばＮｄＦｅＢ系のも
のである。このＮｄＦｅＢ系の永久磁石は、最大磁気エ
ネルギー＋’Ａ （ＢＨ）ｍａｘ ＝ ４１ ＭＧ４３
ｅ 、可逆温度係数−０，０７１％／’Ｏのもので、成
分はＮｄ ２Ｆｅ １４Ｂ型の正方晶系の強磁性Ｆｅ
１７ツチ相を主相とするもの、Ｎｄ ９７Ｆｅ 、Ｎｄ
９ｓＦｅ等１七（イツトリウムを含む希土類元素）
ＩＮ分を９０重１％以上含有する立方晶系の非出性Ｒ’
Ｊッチ相、Ｎｄ２Ｆｅ７Ｂ６等の正方晶系の非磁性Ｂ
ＩＪッチ相等を・４成相とし、さらに酸化物等を含む、
、也のＲ成分を用いた場合も同様である。集光レンズホ
ルダー１０２の下部にＦ、ｚｂ！元レンズ１０１とのＮ
Ｓｔ ／＜ランス金とるだめのカウンターウェイト１
０４が付けられる。集光レンズホルダー１０２は、２枚
の４本支持のゴム製サスペンション１０５（太巌枠斜線
部内）に固定し、ゴム製サスペンション１０５の４箇所
の道部分１０６が外枠１０９に接着される。”また外枠
１０９には４個の永久磁石１０３の集光レンズ１０１の
光軸から遠い側の磁極面（第１図ではＮ極）と平行にな
るように２組の平面状のフを一力シンクコイル１ｔＪ７
とトラッキングコイル１０８も取シ付けられている。The material of the permanent magnet 103 is, for example, NdFeB-based. This NdFeB-based permanent magnet has maximum magnetic energy +'A (BH)max = 41 MG43
e, reversible temperature coefficient -0,071%/'O, the component is Nd 2Fe 14B type tetragonal ferromagnetic Fe
Those whose main phase is 17 Tsuchi phase, Nd 97Fe, Nd
9sFe etc.17 (rare earth elements including yttrium)
Cubic non-extractable R' containing 90% by weight or more of IN content
J-phase, tetragonal non-magnetic B such as Nd2Fe7B6
The IJch phase etc. are made into 4 phases, and further contains oxides etc.
The same applies to the case where the R component of , and is used. F, zb! at the bottom of the condensing lens holder 102! N with original lens 101
St/<Rance gold counterweight 1
04 is added. The condensing lens holder 102 is fixed to two four-piece rubber suspensions 105 (within the shaded area of the wide frame), and the four road portions 106 of the rubber suspensions 105 are adhered to the outer frame 109. ``Furthermore, the outer frame 109 is provided with two sets of flat surfaces parallel to the magnetic pole surface (the N pole in FIG. 1) on the side far from the optical axis of the condensing lens 101 of the four permanent magnets 103. Force sink coil 1tJ7
A tracking coil 108 is also attached.
次に、第２図のディスクと光磁気ヘッドの構成を示す側
面図を用いてＪ＃Ｓｄｉ気ヘッド１００の駆動及び外部
磁界付与原理について述べる。ディスク２００が駆動モ
ータ２０１により矢印の方向に回転駆動する。ディスク
２００上の所定のトラックにトラッキングあるいはフォ
ーカシングは、トラッキングコイル１０８ するいはフ
ォーシングコイル１０７ Ｋ通電することで、このコイ
ルに発生する磁界と永久磁石１０３から常に発生してい
る磁界（図中点線）の相互作用により行われる。さらに
、このトラッキングあるいはフォーカシングの駆動用と
し１用いられる永久磁石１０３の磁界は、四方ディスク
２００上に情報の記録あるいは消去に必要な外部磁界（
図中点線）を印加するためにも用いられる。Next, the principle of driving the J#Sdi optical head 100 and applying an external magnetic field will be described using the side view of FIG. 2 showing the structure of the disk and the magneto-optical head. The disk 200 is rotated by a drive motor 201 in the direction of the arrow. Tracking or focusing on a predetermined track on the disk 200 is achieved by energizing the tracking coil 108 or forcing coil 107K, and the magnetic field generated in this coil and the magnetic field constantly generated from the permanent magnet 103 (the dotted line in the figure) ). Furthermore, the magnetic field of the permanent magnet 103 used for driving this tracking or focusing is the external magnetic field (
It is also used to apply the voltage (dotted line in the figure).
つまり、４つの永久磁石１０３が、フォーカシングトラ
ッキング用及び記録・消去用の磁界付与に用いられてい
るのである。このような働きをさせるために本実施例で
は、４つの永久磁石１０３が同極が回向するようＶＣ構
成させ、Ｎ極からＳ極への方向が、集光レンズ１０１の
光軸と垂直となるようにイ湾成させているのである。In other words, the four permanent magnets 103 are used to apply magnetic fields for focusing and tracking and for recording and erasing. In order to achieve such a function, in this embodiment, the four permanent magnets 103 are arranged in a VC configuration so that the same poles rotate, and the direction from the north pole to the south pole is perpendicular to the optical axis of the condenser lens 101. We are making it possible for it to grow.
第３図において、光磁気ヘッドの動作について述べる。Referring to FIG. 3, the operation of the magneto-optical head will be described.
ディスク２００と光磁気ヘッド１００が所定トラック上
でフォーカスされているとす。この状態にあるとき永久
磁石１０３から発生する外部磁界の磁界強度がディスク
２００に対して情報の記録あるいは消去に必要な強度と
なるように設定されている。しかしながら従来技術にも
記載したように情報の記録時あるいは消去時には、この
外部磁界強度は一定であることが望ましいが、ディスク
２００の回転に伴って、ディスク２００が面振れにより
２０σの位置に示すようになる時がある。この面像れに
よる外部磁界強度の変動の影響は、従来技術に示した通
りである。しかしながら、本実施例の場合、ディスク２
００が２００′の位置に変動したとしても、光磁気ヘッ
ド１００のフォーカス駆動と伴に、光磁気ヘッド１００
が１００′の位ば（説明上トラック位置をずらせている
）に移動し、情報の記録あるいは消去に必俄な磁界強度
を自動的に設計できるのである。これにより、レーザ元
が照射される位置にディスク２０００面掘れによら丁一
定の外部磁界（実験においては４０００ｅ ）が印加で
きる。Assume that the disk 200 and the magneto-optical head 100 are focused on a predetermined track. In this state, the magnetic field strength of the external magnetic field generated from the permanent magnet 103 is set to be the strength necessary for recording or erasing information on the disk 200. However, as described in the prior art, it is desirable that the strength of this external magnetic field be constant when recording or erasing information. There are times when it becomes The influence of fluctuations in external magnetic field strength due to this surface image deviation is as shown in the prior art. However, in the case of this embodiment, the disk 2
Even if 00 changes to the position 200', the magneto-optical head 100 will move along with the focus drive of the magneto-optical head 100.
is moved to the 100' position (the track position is shifted for the sake of explanation), and the magnetic field strength necessary for recording or erasing information can be automatically designed. As a result, a constant external magnetic field (4000 e 2 in experiments) can be applied to the position where the laser source is irradiated due to the surface excavation of the disk 2000.
父、４個の永久磁石１０３の集光レンズホルダー１０２
に接着されている磁極面の極性は、上記の逆でＮ極であ
ってもよいが、この場合記録媒体面上での磁界の方向は
反対となる。Father, condensing lens holder 102 with four permanent magnets 103
The polarity of the magnetic pole surface bonded to the recording medium may be reversed to the above and be N-pole, but in this case, the direction of the magnetic field on the recording medium surface will be opposite.
第５図は、本発明の第２の実施例に係る光磁気ヘッドの
構造を示す図である。第１図と同じ！４造であるが、２
個の永久磁石２０３で情報を記録あるいは消去するに十
分な外部磁界強度とフォーカシングおよびトラッキング
駆動感度が得られる場合には、平面状のフォーカシング
コイル２０７とトラッキングコイル２０８とを粘り合わ
せたもの２組を永久磁石２０３の一万の磁極面（第５図
ではＮ極）と平行に配置すればよい。FIG. 5 is a diagram showing the structure of a magneto-optical head according to a second embodiment of the present invention. Same as Figure 1! Although it is 4 construction, 2
If the external magnetic field strength and focusing and tracking drive sensitivity sufficient to record or erase information can be obtained using two permanent magnets 203, two sets of planar focusing coils 207 and tracking coils 208 glued together may be used. It is sufficient to arrange it parallel to the 10,000 magnetic pole faces (N pole in FIG. 5) of the permanent magnet 203.
′ｌ↓４図：は、本発明の第３の実施例に係る光磁気ア
クチュエータを示す図である。永久磁石３０３と平面状
のフを一カシングコイル３０７ 、 トラッキングコイ
ル３０８の相互の位置関係は、第１図あるいは石５図に
示したものと同じである。サスペンションには、一端を
壜光レンズホルダー３０２に、他端をワイヤー支持ブロ
ック３０９に固定した４本の金属線３（＋５を１史用し
又いる。またダンピング（・ゴ、ワイヤー支持ブロック
３０９中の４本の金ＦＡ線３０５の周囲にゲ 剤３１１
を注入することによって効かせている。'l↓Figure 4: is a diagram showing a magneto-optical actuator according to a third embodiment of the present invention. The mutual positional relationship of the permanent magnet 303, the planar magnet coil 307, and the tracking coil 308 is the same as that shown in FIG. 1 or FIG. The suspension includes four metal wires 3 (+5) fixed at one end to the lens holder 302 and the other end to the wire support block 309. Ge agent 311 is placed around the four gold FA wires 305.
It is made effective by injecting it.
第６図を用いて、本発明のその他の’４−１ｍ例に係る
光磁気ヘッドの構造を説明する。集光レンズ４０１は、
非磁性材料から成る缶状の集光レンズホルダー・＋０２
で、ここに筒状の永久磁石４０３が、集光レンズ４０１
光軸と同軸となるように一体に１固定されている。又、
永久磁石４０３の着磁方向は外周から内周方向である。The structure of a magneto-optical head according to another '4-1m example of the present invention will be described with reference to FIG. The condensing lens 401 is
Can-shaped condensing lens holder made of non-magnetic material +02
Here, a cylindrical permanent magnet 403 is connected to a condensing lens 401.
1 is fixed integrally so as to be coaxial with the optical axis. or,
The magnetization direction of the permanent magnet 403 is from the outer circumference to the inner circumference.
集光レンズホルダー４０２の下部にはカウンターウェイ
ト４０４が付けられ、嘔らにサスペンション用の２枚の
板バネ４０５（斜線部）と接着されている。板バネ４０
５の一端に、永久磁石４０３のＮ極と一定距離７ｉｌ−
置いて円筒状に巻かれたフす−カシングコイル４０７の
固定枠４０９と２個の外枠４１０とではさみ込んで固定
する。このアクチュエータの場合、集光レンズ４０１の
駆動はフォーカシング方向のみであるが、集光レンズ４
０１の周囲がすべて永久磁石４０３のＳ極面となってい
るため、上述の第１図、第５図に於て用いた永久磁石よ
り小さな永久磁石で情報の記録あるいは消去用の外部磁
界を得ることができる。A counterweight 404 is attached to the lower part of the condensing lens holder 402, and two leaf springs 405 (hatched portions) for suspension are glued to the bottom. Leaf spring 40
5 at a certain distance 7il- from the N pole of the permanent magnet 403.
The casing coil 407, which is placed and wound into a cylindrical shape, is sandwiched between a fixing frame 409 and two outer frames 410 and fixed. In the case of this actuator, the condenser lens 401 is driven only in the focusing direction;
Since the area around 01 is the S pole face of the permanent magnet 403, an external magnetic field for recording or erasing information is obtained using a permanent magnet smaller than the permanent magnet used in FIGS. 1 and 5 above. be able to.
以上、第１１図、第５図？よび第６図に於て、フォーカ
シングコイルおよびトラッキングコイルを固定している
側に永久磁石の集光レンズの光軸と遠い側の磁極面と平
行に直感 鉄等から成る高透出率部材を配置すると、こ
の高１ｆｉ磁率部材と永久磁石間の８束蜜度が増大し、
フォーカシングおよびトラッキング駆動感度がさらに大
きくなることは′どうまでもない。That's it for Figure 11 and Figure 5? In Figure 6, a high transmittance member made of iron or the like is placed parallel to the optical axis of the permanent magnet condensing lens and the far side magnetic pole surface on the side where the focusing coil and tracking coil are fixed. Then, the 8-flux density between this high 1fi magnetic flux member and the permanent magnet increases,
It is no wonder that the focusing and tracking drive sensitivities become even greater.
本発明によれば、光磁気ディスクに対して同一側に配置
された光磁気ヘッド内に集光レンズと共に共に可動する
永久磁石を有しているので、フを一カシングおよびトラ
ッキング制御と伴に記録媒体面上での外部磁界強度が常
に一定となり情報信号の品質が著しく向上し、光磁気デ
ィスクメモ１） Ｑ置の信頼性も高くなる。また永久磁
石は、集光レンズのフォーカシングおよびトラッキング
駆動用の磁気回路も兼ねているので従来のように磁気的
干渉もなく、小型で薄型の光磁気ヘッドを提供すること
ができる。さらに、外部磁界発生装置が光磁気ヘッド内
に内蔵されたことにより、ディスクのローディングも容
易になることは明らかである。According to the present invention, since the magneto-optical head disposed on the same side as the magneto-optical disk includes a permanent magnet that moves together with the condensing lens, the magneto-optical head is arranged on the same side as the magneto-optical disk. The external magnetic field strength on the medium surface is always constant, the quality of the information signal is significantly improved, and the reliability of the magneto-optical disk memo 1) Q position is also increased. Furthermore, since the permanent magnet also serves as a magnetic circuit for driving the focusing and tracking of the condenser lens, there is no magnetic interference unlike in the prior art, and a small and thin magneto-optical head can be provided. Furthermore, since the external magnetic field generator is built into the magneto-optical head, it is clear that loading the disk becomes easier.
第１図は本発明に係る第１の実施例を示す光磁気ヘッド
の構成図、第２図は、光磁気ヘッドの駆動及び外部磁界
付与原理を示す図、第３図は光磁気ヘッドの動作を示す
図、第４図は本発明に係る第３の芙逓例を示す光磁気ヘ
ッドの（１４成図、第５図は本発明に係る第２の実施例
を示す光−気ヘッドの構成図、第６図は本発明に係る第
４の実施例を示す光磁気ヘッドの構成図、第７図は従来
例を示す図である。
代理人 弁理士 則 近 憲 佑
同 竹 花 喜久男
図面の浄！（内容に＊Ｅｆ／：Ｌ）
第 ｌ コ４
第２図
第 ５ 図
第 Ｇ 図
第７図
手続補正書（方式）
％式％
（３０７）株式会社 東芝
４、代理人
〒１０５
東京都港区芝浦−丁目１番１号
昭和６１年９月３０日（発送日）
６、補正の対象
明細書および図面
７、補正の内容FIG. 1 is a configuration diagram of a magneto-optical head showing a first embodiment of the present invention, FIG. 2 is a diagram showing the principle of driving the magneto-optical head and applying an external magnetic field, and FIG. 3 is an operation of the magneto-optical head. FIG. 4 shows a configuration of a magneto-optical head showing a third embodiment of the present invention, and FIG. 5 shows a structure of a magneto-optical head showing a second embodiment of the invention. 6 is a block diagram of a magneto-optical head showing a fourth embodiment of the present invention, and FIG. 7 is a diagram showing a conventional example. Clean! (*Ef/:L in the content) Part l Co4 Figure 2 Figure 5 Figure G Figure 7 Procedural amendment (method) % formula % (307) Toshiba Corporation 4, agent 〒105 Tokyo 1-1 Shibaura-chome, Minato-ku September 30, 1986 (shipment date) 6. Specification and drawings subject to amendment 7. Contents of amendment
Claims (5)
録あるいは消去が行える記録媒体上に、レーザ光を所定
の径に集光し、照射するレンズと、 このレンズに一体的に固着され、前記レーザ光の照射が
なされる位置に磁界を印加する永久磁石と、 この永久磁石の発生する磁界と永久磁石の近傍に配置し
たコイルに流す電流との相互作用により、少なくとも前
記レンズの光軸方向に前記永久磁石を駆動させ、前記レ
ーザ光をフォーカスシンクすることにより前記情報の記
録あるいは消去を行なう光磁気ヘッドであって、 この光磁気ヘッドが前記光磁気記録媒体に対してフォー
カス状態にあるとき、前記永久磁石の磁界強度が、前記
情報の記録あるいは消去に必要な強度となり、かつ常に
一定となるように設定されて成ることを特徴とする光磁
気ヘッド。(1) A lens that focuses laser light to a predetermined diameter and irradiates it onto a recording medium on which information can be recorded or erased by irradiating laser light and applying a magnetic field, and a lens that is integrally fixed to this lens. , a permanent magnet that applies a magnetic field to the position where the laser beam is irradiated, and an interaction between the magnetic field generated by the permanent magnet and a current flowing through a coil disposed near the permanent magnet, so that at least the optical axis of the lens is A magneto-optical head that records or erases the information by driving the permanent magnet in a direction and focusing the laser beam, the magneto-optical head being in a focused state with respect to the magneto-optical recording medium. The magneto-optical head is characterized in that the magnetic field strength of the permanent magnet is set to be the strength necessary for recording or erasing the information and always constant.
ることを特徴とする特許請求の範囲第１項記載の光磁気
ヘッド。(2) The magneto-optical head according to claim 1, wherein the permanent magnets are constructed such that the same poles face each other.
ザ光の光軸と垂直となるように構成されて成ることを特
徴とする特許請求の範囲第１項又は第２項記載の光磁気
ヘッド。(3) The permanent magnet is configured such that the direction from the north pole to the south pole is perpendicular to the optical axis of the laser beam, according to claim 1 or 2. magneto-optical head.
で最大となるように構成されて成ることを特徴とする特
許請求の範囲第１項記載又は第２項又は第３項記載の光
磁気ヘッド。(4) The permanent magnet is configured such that its magnetic field strength is maximum on the optical axis of the lens. magneto-optical head.
同軸となるよう構成されて成ることを特徴とする特許請
求の範囲第１項記載の光磁気ヘッド。(5) The magneto-optical head according to claim 1, wherein the permanent magnet is cylindrical and configured to be coaxial with the optical axis of the lens.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17558686A JPS6332755A (en) | 1986-07-28 | 1986-07-28 | Magneto-optical head |
| US07/077,851 US4868802A (en) | 1986-07-28 | 1987-07-27 | Magnetooptic recording and erasing head which performs biasing, tracking and focusing |
| US07/402,760 US4984226A (en) | 1986-07-28 | 1989-09-05 | Magnetoptic head for recording/erasing information using a cylindrical hollow permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17558686A JPS6332755A (en) | 1986-07-28 | 1986-07-28 | Magneto-optical head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6332755A true JPS6332755A (en) | 1988-02-12 |
Family
ID=15998671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17558686A Pending JPS6332755A (en) | 1986-07-28 | 1986-07-28 | Magneto-optical head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6332755A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990003643A1 (en) * | 1988-09-20 | 1990-04-05 | Hewlett-Packard Company | Bias field switching system for magneto-optic disk drive |
| EP0383526A2 (en) * | 1989-02-16 | 1990-08-22 | Minnesota Mining And Manufacturing Company | Magneto-optic recording system |
| US5216643A (en) * | 1988-09-20 | 1993-06-01 | Hewlett-Packard Company | Rotary arm and optical head for a magneto-optic disk drive |
| US5345431A (en) * | 1992-09-14 | 1994-09-06 | Hewlett-Packard Company | Write and erase assembly for magneto-optic drive apparatus |
| US5432763A (en) * | 1993-03-15 | 1995-07-11 | Hewlett-Packard Company | Subminiature rotary actuator optical head |
| US6266300B1 (en) * | 1997-05-27 | 2001-07-24 | Asahi Kogaku Kogyo Kabushiki Kaisha | Optical deflection device having electromagnetic driver assembled therein for rotationally driving optical deflection element |
-
1986
- 1986-07-28 JP JP17558686A patent/JPS6332755A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990003643A1 (en) * | 1988-09-20 | 1990-04-05 | Hewlett-Packard Company | Bias field switching system for magneto-optic disk drive |
| US4977549A (en) * | 1988-09-20 | 1990-12-11 | Hewlett-Packard Company | Write and erase magnetic bias field switching system for a magneto-optic disk drive |
| US5216643A (en) * | 1988-09-20 | 1993-06-01 | Hewlett-Packard Company | Rotary arm and optical head for a magneto-optic disk drive |
| EP0383526A2 (en) * | 1989-02-16 | 1990-08-22 | Minnesota Mining And Manufacturing Company | Magneto-optic recording system |
| US5345431A (en) * | 1992-09-14 | 1994-09-06 | Hewlett-Packard Company | Write and erase assembly for magneto-optic drive apparatus |
| US5432763A (en) * | 1993-03-15 | 1995-07-11 | Hewlett-Packard Company | Subminiature rotary actuator optical head |
| US6266300B1 (en) * | 1997-05-27 | 2001-07-24 | Asahi Kogaku Kogyo Kabushiki Kaisha | Optical deflection device having electromagnetic driver assembled therein for rotationally driving optical deflection element |
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