JP2964517B2 - Magneto-optical pickup device - Google Patents
Magneto-optical pickup deviceInfo
- Publication number
- JP2964517B2 JP2964517B2 JP2019989A JP1998990A JP2964517B2 JP 2964517 B2 JP2964517 B2 JP 2964517B2 JP 2019989 A JP2019989 A JP 2019989A JP 1998990 A JP1998990 A JP 1998990A JP 2964517 B2 JP2964517 B2 JP 2964517B2
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- recording medium
- optical
- magnetic field
- optical 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.)
- Expired - Lifetime
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
-
- 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
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
-
- 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
- G11B11/10532—Heads
- G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
- G11B11/10536—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording using thermic beams, e.g. lasers
-
- 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
- G11B11/10554—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base the transducers being disposed on the same side of the carrier
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、磁気カー効果やファラデー効果等の磁気光
学効果を利用して光磁気記録媒体において情報信号を記
録再生する光磁気ピックアップ装置に関するものであ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical pickup device that records and reproduces information signals on a magneto-optical recording medium using a magneto-optical effect such as a magnetic Kerr effect and a Faraday effect. It is.
本発明による光磁気ピックアップ装置は、磁界を発生
させるためのコイルパターンを形成した光透過性を有す
る板材を光磁気記録媒体とレーザビーム集束手段との間
でレーザビーム集束手段に対して固定することにより、
コイルパターンと光磁気記録媒体との距離を短くでき、
例えば磁界変調方式による両面光磁気記録媒体への情報
信号の記録及び再生を可能とするものである。In the magneto-optical pickup device according to the present invention, a plate material having a light transmittance formed with a coil pattern for generating a magnetic field is fixed to the laser beam focusing means between the magneto-optical recording medium and the laser beam focusing means. By
The distance between the coil pattern and the magneto-optical recording medium can be shortened,
For example, it is possible to record and reproduce information signals on a double-sided magneto-optical recording medium by a magnetic field modulation method.
今日における光磁気記録媒体への記録方式としては、
光変調方式と磁界変調方式が知られているが、オーバー
ライト（重ね書き）が可能であるため、一般に、磁界変
調方式が有利であるとされている。Today's recording methods for magneto-optical recording media include:
Although a light modulation method and a magnetic field modulation method are known, a magnetic field modulation method is generally considered to be advantageous because overwriting (overwriting) is possible.
この磁界変調方式を用いる従来の光磁気ピックアップ
装置を第５図に示す。FIG. 5 shows a conventional magneto-optical pickup device using this magnetic field modulation system.
この第５図において光磁気ピックアップ装置は、片面
光磁気記録媒体50を装着した際に、片面光磁気記録媒体
50の上面側にレーザ装置58及び対物レンズ59等から成る
光学系を設け、また、片面光磁気記録媒体50の下面側に
磁気系である磁界発生装置60を設けて構成されている。In FIG. 5, when the single-sided magneto-optical recording medium 50 is mounted, the single-sided magneto-optical recording medium
An optical system including a laser device 58 and an objective lens 59 is provided on the upper surface side of the optical disk 50, and a magnetic field generator 60 as a magnetic system is provided on the lower surface side of the single-sided magneto-optical recording medium 50.
また、光磁気記録媒体50に関するフォーカス方向及び
トラッキング方向への光学系の駆動のために、図示省略
した駆動系が設けられている。磁気系についても第５図
の矢印方向及び上記トラッキング方向への駆動のため
に、図示省略した別の駆動系が設けられている。A drive system (not shown) is provided for driving the optical system in the focus direction and the tracking direction with respect to the magneto-optical recording medium 50. As for the magnetic system, another drive system (not shown) is provided for driving in the direction indicated by the arrow in FIG. 5 and in the tracking direction.
磁界変調方式においては、磁界を高速で反転制御する
必要があるため充分な励磁電流が得られず、発生磁界強
度に限度があるため、上記磁界発生装置６は、片面光磁
気記録媒体50内の後述の記録磁性層53の近くに配設され
る。In the magnetic field modulation method, it is necessary to perform inversion control of the magnetic field at high speed, so that a sufficient exciting current cannot be obtained and the generated magnetic field intensity is limited. It is provided near a recording magnetic layer 53 described later.
一方、上記片面光磁気記録媒体50は、例えばポリカー
ボネート等の透明基板51の一側面に、誘電体層52、例え
ば希土類−遷移金属合金非晶質薄膜等の磁気光学効果の
大きな記録磁性層53、誘電体層54、反射層55、保護カバ
ー56を順に積層して成っている。この場合、上記透明基
体51の厚さは一定であり、例えば1.2mmに設定されてい
る。On the other hand, the single-sided magneto-optical recording medium 50 has a dielectric layer 52, for example, a recording magnetic layer 53 having a large magneto-optical effect such as a rare earth-transition metal alloy amorphous thin film, on one side surface of a transparent substrate 51 such as polycarbonate. The dielectric layer 54, the reflective layer 55, and the protective cover 56 are sequentially laminated. In this case, the thickness of the transparent substrate 51 is constant, and is set to, for example, 1.2 mm.
次に簡単な動作説明をする。 Next, a simple operation will be described.
先ず、図示省略した回転ディスクに片面光磁気記録媒
体50を設置し回転駆動し、片面光磁気記録媒体50内の記
録磁性層53に磁界発生装置60からの磁界を印加する。こ
の印加される磁界は高速反転制御されており、この磁界
の印加された記録磁性層53に、レーザ装置58から照射さ
れレーザビームを対物レンズ59を介して集束することに
より、このレーザビームを集束した領域の記録磁性層53
を磁化させることができ、リアルタイムに情報信号をオ
ーバーライトすることができる。First, the single-sided magneto-optical recording medium 50 is mounted on a rotating disk (not shown) and driven to rotate, and a magnetic field from the magnetic field generator 60 is applied to the recording magnetic layer 53 in the single-sided magneto-optical recording medium 50. The applied magnetic field is controlled at high speed reversal. The laser beam is irradiated from the laser device 58 onto the recording magnetic layer 53 to which the magnetic field is applied, and the laser beam is focused through the objective lens 59, so that the laser beam is focused. Area of the recording magnetic layer 53
Can be magnetized, and the information signal can be overwritten in real time.
ところで、近年における情報量の増大化に伴い、一枚
の光磁気記憶媒体の両面に情報信号の記録ができるよう
な両面光磁気記録媒体が開発されている。With the increase in the amount of information in recent years, double-sided magneto-optical recording media capable of recording information signals on both sides of a single magneto-optical recording medium have been developed.
このような従来の両面光磁気記録媒体70は、例えば第
６図に示すように、透明基板71a、誘電体層72a、記録磁
性層73a、誘電体層74a及び反射層75aを順に積層して成
る光磁気記録媒体Ａと、同じく透明基板71b、誘電体層7
2b、記録磁性層73b、誘電体層74b及び反射層75bを順に
積層して成る光磁気記録媒体Ｂとを接着剤76で接着する
ことにより成っている。なお、この両面光磁気記録媒体
70は、機械的強度を確保するために透明基板71a、透明
基板71bの厚さを例えば数mm程度にしてあり、この透明
基板71a、透明基板71b及び記録磁性層73a、記録磁性層7
3b等を積層して成っているため、上記片面光磁気記録媒
体50に比べ媒体自体が厚くなっている。Such a conventional double-sided magneto-optical recording medium 70 comprises, for example, as shown in FIG. 6, a transparent substrate 71a, a dielectric layer 72a, a recording magnetic layer 73a, a dielectric layer 74a, and a reflective layer 75a which are sequentially stacked. Magneto-optical recording medium A, transparent substrate 71b, dielectric layer 7
2b, a recording magnetic layer 73b, a dielectric layer 74b, and a reflective layer 75b, which are sequentially laminated, and a magneto-optical recording medium B, which is bonded by an adhesive 76. This double-sided magneto-optical recording medium
70, the thickness of the transparent substrate 71a, the transparent substrate 71b is, for example, about several mm in order to ensure mechanical strength, the transparent substrate 71a, the transparent substrate 71b, the recording magnetic layer 73a, the recording magnetic layer 7
3b and the like, the medium itself is thicker than the single-sided magneto-optical recording medium 50.
ところで、第５図に示す従来の磁界変調方式の光磁気
ピックアップ装置において、上記両面光磁気記録媒体70
を用いる際には両面光磁気記録媒体70の上面側に光学系
を、また、下面側に磁気系を配して記録を行うようにな
るため、例えば両面光磁気記録媒体70の上側の光磁気記
録媒体Ａに記録を行う場合、上面側から記録磁性層73a
にレーザビームを集束することができても、この両面光
磁気記録媒体70自体が厚いため、下面側の磁界発生装置
60からの磁界を充分な強さで印加することができない。
これは、磁界変調方式の磁界発生装置においては、高周
波のデータ信号に応じた高周波の電流を電磁コイルに流
さなければならないが、電流は高周波になればなるぼど
コイルを流れ難くなるため、発生磁界に制限があるうえ
に、磁界発生装置60から録磁性層73aまでの距離が大き
いためである。よって、現行の技術では磁界変調方式に
よる両面光磁気記録は極めて困難とされている。By the way, in the conventional magnetic field modulation type magneto-optical pickup device shown in FIG.
When using a double-sided magneto-optical recording medium 70, an optical system is arranged on the upper surface side and a magnetic system is arranged on the lower surface side to perform recording. When recording is performed on the recording medium A, the recording magnetic layer 73a is
Although the laser beam can be focused on the lower surface side, since the double-sided magneto-optical recording medium 70 itself is thick,
The magnetic field from 60 cannot be applied with sufficient strength.
This is because in a magnetic field modulation type magnetic field generator, a high-frequency current corresponding to a high-frequency data signal must be passed through the electromagnetic coil. This is because the magnetic field is limited and the distance from the magnetic field generator 60 to the recording layer 73a is large. Therefore, it is extremely difficult to perform double-sided magneto-optical recording by the magnetic field modulation method with the current technology.
本発明は上述の課題に鑑みて成されたものであり、簡
単な構成で両面光磁気記録媒体への磁界変調方式による
情報信号の記録及び再生を可能とするような光磁気ピッ
クアップ装置の提供を目的とする。The present invention has been made in view of the above-described problems, and provides a magneto-optical pickup device capable of recording and reproducing an information signal on a double-sided magneto-optical recording medium by a magnetic field modulation method with a simple configuration. Aim.
本発明による光磁気ピックアップ装置は、レーザビー
ム発生手段から発生されるレーザビームを光磁気記録媒
体に集束するレーザビーム集束手段と、上記光磁気記録
媒体と上記レーザビーム集束手段との間に位置する様に
このレーザビーム集束手段に対して固定されており、上
記光磁気記録媒体に印加するための磁界を発生するコイ
ルパターンが形成されており、光透過性を有する板材と
を具備することにより上述の課題を解決する。A magneto-optical pickup device according to the present invention is located between a laser beam focusing means for focusing a laser beam generated from a laser beam generating means on a magneto-optical recording medium and the laser beam focusing means. In this manner, a coil pattern for generating a magnetic field to be applied to the magneto-optical recording medium is fixed to the laser beam converging means, and a plate material having optical transparency is provided. To solve the problem.
光磁気記録媒体に印加するための磁界を発生するコイ
ルパターンが光透過性の板材に形成されているので、光
磁気記録媒体とレーザビーム集束手段との間にコイルパ
ターンを容易に位置させることができて、いわゆる光学
系と磁気系とが光磁気記録媒体の同一面側に配置された
簡単な構成になっている。しかも、板材がレーザビーム
集束手段に対して固定されていて光学系と磁気系とが連
動するので、光磁気記録媒体に印加する磁界の強度を一
定にするための駆動系が磁気系に不要であり、設置スペ
ースが少なくてよい。Since the coil pattern for generating a magnetic field to be applied to the magneto-optical recording medium is formed on the light-transmitting plate, the coil pattern can be easily located between the magneto-optical recording medium and the laser beam focusing means. As a result, a so-called optical system and a magnetic system have a simple configuration arranged on the same surface side of the magneto-optical recording medium. In addition, since the plate member is fixed to the laser beam focusing means and the optical system and the magnetic system are interlocked, a drive system for keeping the intensity of the magnetic field applied to the magneto-optical recording medium constant is not required in the magnetic system. Yes, installation space is small.
４ 以下、本発明による光磁気ピックアップ装置の第１
〜第３の実施例について図面を参照しながら説明する。4. Hereinafter, the first of the magneto-optical pickup device according to the present invention will be described.
Third to third embodiments will be described with reference to the drawings.
第１図は本発明による光磁気ピックアップ装置の第１
の実施例の断面図である。FIG. 1 shows a first embodiment of a magneto-optical pickup device according to the present invention.
It is sectional drawing of the Example of FIG.
この第１図における光磁気ピックアップ装置は、レー
ザ装置１と、対物レンズ２と、フォーカスコイル3a及び
トラッキングコイル3bが巻装されたコイルボビン４と、
このコイルボビン４の周りに配されるマグネット５とか
ら成る光学系であるピックアップ６と、磁気系である磁
界発生装置９とから構成されている。The magneto-optical pickup device in FIG. 1 includes a laser device 1, an objective lens 2, a coil bobbin 4 on which a focus coil 3a and a tracking coil 3b are wound,
A pickup 6 is an optical system composed of a magnet 5 disposed around the coil bobbin 4, and a magnetic field generator 9 is a magnetic system.
上記ピックアップ６のコイルボビン４は、例えば円筒
形をしており、周囲にこのピックアップ６を第１図に示
すｆ方向に駆動させるためのフォーカスコイル3a及びピ
ックアップ６を第１図に示すｔ方向に駆動させるために
巻回されたトラッキングコイル3bが設けられている。ま
た、コイルボビン４の端部4aに近い位置には、レンズ支
持部材2aが設けられており、これにより上記レーザ装置
１から照射されるレーザビームを集束する対物レンズ２
を支持している。The coil bobbin 4 of the pickup 6 has, for example, a cylindrical shape, and the focus coil 3a for driving the pickup 6 in the direction f shown in FIG. 1 and the pickup 6 in the direction t shown in FIG. A tracking coil 3b wound therearound is provided. A lens support member 2a is provided at a position near the end 4a of the coil bobbin 4, and thereby an objective lens 2 for focusing a laser beam emitted from the laser device 1 is provided.
I support.
上記磁界発生装置９は、第２図に示すように、例えば
石英等のような光透過性を有する光学ガラス８の表面8a
に、高周波信号の電流を流して磁界を発生させるための
導体7aが、渦巻き状のコイルパターン７として形成され
ることにより構成されている。この光学ガラス８のコイ
ルパターン７が形成されていない裏面8bには、上記コイ
ルボビン４の端部4aが、上記コイルパターン７の中心
と、対物レンズ２の中心とが一致するように位置合わせ
されて接着固定されている。これにより、発生する磁界
の中心にレーザビームを集束することができるため、ピ
ックアップの組み立て時における中心合わせの調整が不
要となる。As shown in FIG. 2, the magnetic field generator 9 has a surface 8a of an optical glass 8 having a light transmitting property such as quartz.
In addition, a conductor 7a for flowing a current of a high-frequency signal to generate a magnetic field is formed as a spiral coil pattern 7. The end 4a of the coil bobbin 4 is positioned on the back surface 8b of the optical glass 8 on which the coil pattern 7 is not formed so that the center of the coil pattern 7 and the center of the objective lens 2 coincide. Adhesively fixed. As a result, the laser beam can be focused on the center of the generated magnetic field, so that it is not necessary to adjust the centering when assembling the pickup.
なお、上記光学ガラス８に石英を用いたのは一例であ
り、光透過性のものであれば何でもよく、また、上記コ
イルパターン７において、例えばプリントコイル、薄膜
コイル等を用いたりすることができる。The use of quartz for the optical glass 8 is merely an example, and any material may be used as long as it is light-transmissive. In the coil pattern 7, for example, a printed coil, a thin-film coil, or the like can be used. .
一方、第１図に示す第１の両面光磁気記録媒体10は、
本件出願人が先に特願平１−142563号の明細書及び図面
において提案したものであり、共通化した基体11の両面
にそれぞれ記録部16、光硬化樹脂樹脂層17、透明保護板
18を設けて構成されている。On the other hand, the first double-sided magneto-optical recording medium 10 shown in FIG.
The applicant of the present application has previously proposed in the specification and drawings of Japanese Patent Application No. 1-142563, and a recording section 16, a photocurable resin layer 17, and a transparent protective plate are provided on both sides of a common base 11, respectively.
18 are provided.
上記各記録部16においては、それぞれ反射層15が記録
磁性層12よりも基体11側に配されるように積層されてお
り、それぞれ基体11側から反射層15、第２の誘電体層1
4、記録磁性層12、第１の誘電体層13の順に積層されて
いる。In each of the recording sections 16, the reflection layer 15 is laminated so as to be disposed closer to the base 11 than the recording magnetic layer 12, and the reflection layer 15 and the second dielectric layer 1 are respectively disposed from the base 11 side.
4. The recording magnetic layer 12 and the first dielectric layer 13 are laminated in this order.
この両面光磁気記録媒体10は基体11が共通化されてい
るため、これまでの基体の貼り合わせによる既述の従来
の両面光磁気記録媒体50に比べて厚さをほぼ半分に抑え
ることができるようなものである。In this double-sided magneto-optical recording medium 10, since the substrate 11 is shared, the thickness can be reduced to almost half as compared with the above-described conventional double-sided magneto-optical recording medium 50 by pasting the substrates. It is like.
次に動作説明をする。 Next, the operation will be described.
上述のように構成される光磁気ピックアップ装置は、
フォーカスコイル3aにフォーカス駆動電流を供給するこ
とにより、コイルボビン４、及びこのコイルボビン４に
設けられている磁界発生装置９が第１図中矢印ｆで示す
上記対物レンズ２の光軸方向であるフォーカス方向に駆
動変位される。また、上記トラッキングコイル3bにトラ
ッキング駆動電流が供給されることにより、コイルボビ
ン４、及び磁界発生装置９が第１図中矢印ｔで示す対物
レンズ２の光軸に直行する方向であるトラッキング方向
に駆動変位される。The magneto-optical pickup device configured as described above,
By supplying a focus drive current to the focus coil 3a, the coil bobbin 4 and the magnetic field generator 9 provided on the coil bobbin 4 are focused in the optical axis direction of the objective lens 2 indicated by an arrow f in FIG. Is driven and displaced. Further, by supplying a tracking drive current to the tracking coil 3b, the coil bobbin 4 and the magnetic field generator 9 are driven in a tracking direction which is a direction perpendicular to the optical axis of the objective lens 2 indicated by an arrow t in FIG. Displaced.
同時に、磁界発生装置９の導体7aで形成されるコイル
パターン７に、記録しようとする信号を増幅した高周波
数の電流信号を供給することにより磁界が発生する。こ
の磁界は記録信号に応じて高速反転制御されており、上
記両面光磁気記録媒体10の記録磁性層12に印加される。
そして、この記録磁性層12の磁界の印加された領域に、
レーザ装置１から照射されるレーザビームを対物レンズ
２及び光透過性を有する光学ガラス８を介して集束し、
記録磁性層12の温度をキュリー点以上に上昇させること
により情報信号の記録を行うことができる。At the same time, a magnetic field is generated by supplying a high-frequency current signal obtained by amplifying a signal to be recorded to the coil pattern 7 formed by the conductor 7a of the magnetic field generator 9. This magnetic field is subjected to high-speed inversion control according to a recording signal, and is applied to the recording magnetic layer 12 of the double-sided magneto-optical recording medium 10.
Then, in the region of the recording magnetic layer 12 where the magnetic field is applied,
The laser beam emitted from the laser device 1 is focused through the objective lens 2 and the optical glass 8 having light transmittance,
Information signals can be recorded by raising the temperature of the recording magnetic layer 12 above the Curie point.
以上の説明から明らかなように、本実施例における光
磁気ピックアップ装置は、レーザ装置１や対物レンズ２
等から成るピックアップ６である光学系と、光学ガラス
８にコイルパターン７を形成して成る磁界発生装置９で
ある磁気系とを両面光磁気記録媒体10の同一面側に設け
ることにより、コイルパターンと光磁気記録媒体10との
距離を短くでき、例えば後述の第２及び第３の実施例に
示すように、従来までは極めて困難であるとされていた
光磁気変調方式による両面光磁気記録媒体への記録及び
再生が可能となる。As is clear from the above description, the magneto-optical pickup device according to the present embodiment includes the laser device 1 and the objective lens 2.
By providing an optical system as a pickup 6 made of a magnetic material as a magnetic field generator 9 formed by forming a coil pattern 7 on an optical glass 8 on the same side of a double-sided magneto-optical recording medium 10, And the magneto-optical recording medium 10 can be shortened. For example, as shown in the second and third embodiments described below, a double-sided magneto-optical Recording and reproduction to and from a computer.
また、ピックアップ６のコイルボビン４と磁界発生装
置９とを、例えば接着等によって結合固定することによ
り、対物レンズ２の中心と、磁界発生装置９の磁界の中
心とを合わせることが容易となり、また、フォーカスサ
ーボにより、ピックアップ６と磁界発生装置９とが連動
するため、両面光磁気記録媒体に印加する磁界の強度を
常に一定とすることができる。したがって、従来まで必
要であった磁気系のための駆動系を省略できる。そし
て、上記光磁気ピックアップ装置の配設スペースに余裕
ができるため、設計における自由度を増すことができ
る。Further, by coupling and fixing the coil bobbin 4 of the pickup 6 and the magnetic field generator 9 by, for example, bonding or the like, it becomes easy to align the center of the objective lens 2 with the center of the magnetic field of the magnetic field generator 9. Since the pickup 6 and the magnetic field generator 9 are linked by the focus servo, the intensity of the magnetic field applied to the double-sided magneto-optical recording medium can be kept constant. Therefore, the drive system for the magnetic system, which has been required until now, can be omitted. Further, since the space for disposing the magneto-optical pickup device can be provided, the degree of freedom in design can be increased.
次に、第２の実施例について説明する。第３図に示す
ように本実施例は、光磁気ピックアップ装置を第１図に
示す両面光磁気記録媒体10の下面側にも配置することに
よって、両面光磁気記録媒体10の上面側及び下面側に第
１及び第２の光磁気ピックアップ装置を夫々備えて構成
されているものである。Next, a second embodiment will be described. As shown in FIG. 3, in the present embodiment, the magneto-optical pickup device is also arranged on the lower surface side of the double-sided magneto-optical recording medium 10 shown in FIG. Are provided with first and second magneto-optical pickup devices, respectively.
この場合、上記媒体10を介して対向するように配置さ
れる第１及び第２の光磁気ピックアップ装置は第１の実
施例において既述したのと同様の装置であってよい。第
３図に示す第２の光磁気ピックアップ装置の各構成部分
１′〜９′については、それらの数字及びアルファベッ
トが第１図及び第２図において符号１〜９で示す各構成
部分と対応するので、それらの説明は省略する。In this case, the first and second magneto-optical pickup devices arranged to face each other with the medium 10 interposed therebetween may be the same devices as described in the first embodiment. The numerals and alphabets of the components 1 'to 9' of the second magneto-optical pickup device shown in FIG. 3 correspond to the components 1 to 9 in FIGS. 1 and 2. Therefore, their description is omitted.
また、上記第１及び第２の光磁気ピックアップ装置
は、第１の実施例の場合と同様に動作する。そして、第
１及び第２のピックアップ装置は互いに同期して上記ｆ
方向及びｔ方向に駆動するように構成できる。The first and second magneto-optical pickup devices operate in the same manner as in the first embodiment. Then, the first and second pickup devices are synchronized with each other, and
It can be configured to drive in the direction and the t direction.
第２の実施例によれば、両面光磁気記録媒体の記録及
び再生を様々に行うことが可能となり、例えばレーザ装
置１、１′及び磁気発生装置９、９′を同時に用いるこ
とによって、両面光磁気記録媒体10の上面側及び下面側
への同時記録が可能となり、またレーザ装置１と１′と
を同時に用いれば同時再生が可能となる。これによっ
て、高容量化が図れるとともに、情報信号のより高速な
記録及び再生が可能となる。According to the second embodiment, it is possible to perform various recording and reproduction on the double-sided magneto-optical recording medium. For example, by using the laser devices 1, 1 'and the magnetic generators 9, 9' at the same time, the double-sided Simultaneous recording can be performed on the upper and lower surfaces of the magnetic recording medium 10, and simultaneous reproduction can be performed by using the laser devices 1 and 1 'simultaneously. As a result, the capacity can be increased, and the information signal can be recorded and reproduced at a higher speed.
また、両面光磁気記録媒体10の一方の面においてまず
記録または再生を行ってから、次に他方の面において記
録または再生を行うことが可能となる。これによって、
片面光磁気記録媒体と比べて２倍の容量の記録及び再生
ができる。Further, it is possible to first perform recording or reproduction on one surface of the double-sided magneto-optical recording medium 10 and then perform recording or reproduction on the other surface. by this,
Recording and reproduction can be performed at twice the capacity of a single-sided magneto-optical recording medium.
なお、上述の場合、一方の面に記載する際、他方の両
側に配置されている磁性発生装置９または９′からも磁
界を発生させながら２つの磁界発生装置９及び９′を同
時に用いることができる。したがって、磁気記録層12に
対してその両面から磁界を加えることができ、より大き
な磁界のもので記録を行なえる。In the above case, when writing on one surface, two magnetic field generators 9 and 9 'may be used simultaneously while generating a magnetic field from the magnetic generators 9 or 9' arranged on the other side. it can. Therefore, a magnetic field can be applied to the magnetic recording layer 12 from both sides, and recording can be performed with a larger magnetic field.
また、一方の面に記録する際他方の面側に配置されて
いる磁界発生装置だけを用いることにより記録を行うこ
とも可能である。When recording on one surface, it is also possible to perform recording by using only the magnetic field generator arranged on the other surface side.
次に、第３の実施例について説明する。第４図に示す
ように本実施例は、第３図に示すのと同様の光磁気ピッ
クアップ装置を用いともに、第４図に示す第２の両面光
磁気記録装置30を用いて記録及び再生を行うことができ
るように構成されているものである。Next, a third embodiment will be described. As shown in FIG. 4, this embodiment uses the same magneto-optical pickup device as shown in FIG. 3 and performs recording and reproduction using the second double-sided magneto-optical recording device 30 shown in FIG. It is configured to be able to do so.
上記第２の両面光磁気記録媒体30は、本願の発明者の
１人が先に他の発明者と共に特願平１−274734号の明細
書及び図面において提案したものであり、共通化した基
体31の両面にそれぞれ高透磁率層32、光硬化性樹脂層3
3、光磁気記録層34、接着剤層35、透明保護板36が順次
に積層されているものである。高透磁率層32は、例えば
Fe、Co、Niなどの遷移金属、及びこれらの合金であるパ
ーマロイ、センダスト、またはアモルファス磁性合金な
どの高透磁率を有する材料から構成されるものであっ
て、両面光磁気記録媒体30の垂直芳香における垂直磁界
効率を高めることが可能となる。The second double-sided magneto-optical recording medium 30 is one proposed by one of the inventors of the present application together with another in the specification and drawings of Japanese Patent Application No. 1-274734, and has a common substrate. High-permeability layer 32 and photo-curable resin layer 3 on both sides of 31, respectively
3. A magneto-optical recording layer 34, an adhesive layer 35, and a transparent protective plate 36 are sequentially laminated. The high magnetic permeability layer 32 is, for example,
It is made of a material having a high magnetic permeability such as a transition metal such as Fe, Co, and Ni, or an alloy of these materials, such as permalloy, sendust, or an amorphous magnetic alloy. , The vertical magnetic field efficiency can be increased.
第３の実施例においては、第２の両面光磁気記録媒体
30が高透磁率層34を備えているため、磁界発生装置９、
９′からの磁束が、例えば第４図の破線で示すように、
磁気閉ループを構成するから、記録時における両面光磁
気記録媒体30に印加される磁束を効果的に収束してその
垂直磁界効率を高めることができて好ましい。In the third embodiment, a second double-sided magneto-optical recording medium
Since 30 includes the high permeability layer 34, the magnetic field generator 9,
The magnetic flux from 9 ', for example, as indicated by the dashed line in FIG.
Since the magnetic closed loop is formed, the magnetic flux applied to the double-sided magneto-optical recording medium 30 at the time of recording can be effectively converged and the perpendicular magnetic field efficiency can be improved, which is preferable.
また、第３の実施例においても、両面光磁気記録媒体
30の両面において、同時に記録または再生が可能であ
り、また一方の面で記録または再生を行ってから、次に
他方の面で記録または再生を行うことが可能である。Also in the third embodiment, the double-sided magneto-optical recording medium
Recording or reproduction can be performed simultaneously on both sides of the recording medium 30, and recording or reproduction can be performed on one side and then recording or reproduction can be performed on the other side.
なお、上述した光磁気ピックアップ装置の実施例１〜
３における磁気発生装置９、９′では、光透過性を有す
る板材として光学ガラス８、８′にコイルパターン７、
７′を形成して用いたが、反射を防ぐためレーザビーム
の通過する孔部を設けることにより光透過性を持たせた
板材を用いることもできる。In addition, Embodiments 1 to 1 of the above-described magneto-optical pickup device were used.
In the magnetic generators 9 and 9 'in FIG. 3, the coil patterns 7, 8'
Although 7 'is formed and used, a plate material having light transmittance by providing a hole through which a laser beam passes to prevent reflection may be used.
また、本実施例１〜３においては、その磁界発生装置
９、９′は磁界変調方式によるものであったが、本発明
はこれに限定されるものではなく、他の方式例えば光変
調方式によるものにも適用可能である。Further, in the first to third embodiments, the magnetic field generators 9 and 9 'are based on the magnetic field modulation system. However, the present invention is not limited to this. It is also applicable to things.
本発明の光磁気ピックアップ装置によれば、いわゆる
光学系と磁気系とが光磁気記録媒体の同一面側に配置さ
れた簡単な構成になっており、また、配置スペースが少
なくてよいので設計における自由度を増すことができ
る。According to the magneto-optical pickup device of the present invention, a so-called optical system and a magnetic system have a simple configuration in which they are arranged on the same surface side of a magneto-optical recording medium. The degree of freedom can be increased.
したがって、両面光磁気記録媒体の両面に光学系と磁
気系とを具備する光磁気ピックアップを夫々配置するこ
とが可能となって、両面光磁気記録媒体の両面における
情報信号の記録及び再生を同時にあるいは一方の面から
他方の面へと行うことができる。これによって、より多
くの情報信号の記録再生及びより高速な記録再生が可能
となる。Therefore, it is possible to dispose a magneto-optical pickup having an optical system and a magnetic system on both sides of the double-sided magneto-optical recording medium, respectively, so that recording and reproduction of information signals on both sides of the double-sided magneto-optical recording medium can be performed simultaneously or simultaneously. It can be done from one side to the other. This enables recording and reproduction of more information signals and higher-speed recording and reproduction.
第１図〜第４図は本発明による光磁気ピックアップ装置
の実施例１〜３を示すものであって、第１図は第１の実
施例の構成を示す断面図、第２図は第１図に示す光磁気
ピックアップ装置において用いることのできるコイルパ
ターンの形成された光学ガラスの正面図、第３図は光磁
気ピックアップ装置の第２の実施例の構成を示す断面
図、第４図は光磁気ピックアップ装置の第３の実施例の
構成を示す断面図である。 第５図及び第６図は従来例を示すものであって、第５図
は従来の光磁気ピックアップ装置の構成例を示す断面
図、第６図は従来の両面光磁気記録媒体の構成例を示す
断面図である。 なお、図面に用いられた符号において、 1,1′……レーザ装置（レーザビーム発生手段） 2,2′……対物レッズ（レーザビーム集束手段） 7,7′……コイルパターン 8,8′……光学ガラス（板材） 9,9′……磁界発生装置 10……第１の両面光磁気記録媒体 30……第２の両面光磁気記録媒体 である。1 to 4 show the first to third embodiments of the magneto-optical pickup device according to the present invention. FIG. 1 is a sectional view showing the structure of the first embodiment, and FIG. FIG. 3 is a front view of an optical glass having a coil pattern which can be used in the magneto-optical pickup device shown in FIG. 3, FIG. 3 is a sectional view showing the configuration of a second embodiment of the magneto-optical pickup device, and FIG. FIG. 9 is a cross-sectional view illustrating a configuration of a third embodiment of the magnetic pickup device. 5 and 6 show a conventional example, FIG. 5 is a sectional view showing a configuration example of a conventional magneto-optical pickup device, and FIG. 6 is a configuration example of a conventional double-sided magneto-optical recording medium. FIG. In the reference numerals used in the drawings, 1,1 ': laser device (laser beam generating means) 2, 2': objective reds (laser beam focusing means) 7, 7 ': coil pattern 8, 8' ... optical glass (plate material) 9, 9 '... magnetic field generator 10 ... first double-sided magneto-optical recording medium 30 ... second double-sided magneto-optical recording medium.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山上 保 東京都品川区北品川６丁目７番35号 ソ ニー株式会社内 (72)発明者 青木 芳夫 東京都品川区北品川６丁目７番35号 ソ ニー株式会社内 (56)参考文献 特開 昭62−204456（ＪＰ，Ａ) 特開 平２−187951（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G11B 11/10 G11B 5/02 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tamotsu Yamagami 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Yoshio Aoki 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (56) References JP-A-62-204456 (JP, A) JP-A-2-187951 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) G11B11 / 10 G11B 5/02
Claims (1)
ザビームを光磁気記録媒体の集束するレーザビーム集束
手段と、 上記光磁気記録媒体と上記レーザビーム集束手段との間
に位置する様にこのレーザビーム集束手段に対して固定
されており、上記光磁気記録媒体に印加するための磁界
を発生するコイルパターンが形成されており、光透過性
を有する板材とを具備することを特徴とする光磁気ピッ
クアップ装置。1. A laser beam converging means for converging a laser beam generated from a laser beam generating means on a magneto-optical recording medium; and a laser beam converging means disposed between the magneto-optical recording medium and the laser beam converging means. A coil pattern fixed to the beam converging means for generating a magnetic field to be applied to the magneto-optical recording medium, and having a light-transmissive plate material. Pickup device.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE69025103T DE69025103T2 (en) | 1989-07-29 | 1990-07-16 | Magneto-optical scanning, recording and reproducing device |
| SG1996008102A SG50664A1 (en) | 1989-07-29 | 1990-07-16 | Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus |
| EP90307757A EP0411783B1 (en) | 1989-07-29 | 1990-07-16 | Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus |
| KR1019900011464A KR100225730B1 (en) | 1989-07-29 | 1990-07-27 | Magneto optical pickup apparatus and magneto optical recording/reproducing apparatus |
| MYPI90001269A MY106851A (en) | 1989-07-29 | 1990-07-27 | Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus. |
| US07/808,077 US5287334A (en) | 1989-07-29 | 1991-12-11 | Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19734989 | 1989-07-29 | ||
| JP1-197349 | 1989-07-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03130951A JPH03130951A (en) | 1991-06-04 |
| JP2964517B2 true JP2964517B2 (en) | 1999-10-18 |
Family
ID=16373006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2019989A Expired - Lifetime JP2964517B2 (en) | 1989-07-29 | 1990-01-30 | Magneto-optical pickup device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2964517B2 (en) |
| KR (1) | KR100225730B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100319519B1 (en) * | 1997-12-17 | 2002-02-19 | 이형도 | Fine Uneven Pattern Recognition and Readout Structure of Pickup Actuator |
| KR100704819B1 (en) * | 2004-12-22 | 2007-04-10 | 후지쯔 가부시끼가이샤 | Magnetic field generator and magneto-optical information storage device |
-
1990
- 1990-01-30 JP JP2019989A patent/JP2964517B2/en not_active Expired - Lifetime
- 1990-07-27 KR KR1019900011464A patent/KR100225730B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR100225730B1 (en) | 1999-10-15 |
| KR910003616A (en) | 1991-02-28 |
| JPH03130951A (en) | 1991-06-04 |
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