JPS61278058A - Photomagnetic recording/reproducing device - Google Patents
Photomagnetic recording/reproducing deviceInfo
- Publication number
- JPS61278058A JPS61278058A JP11849485A JP11849485A JPS61278058A JP S61278058 A JPS61278058 A JP S61278058A JP 11849485 A JP11849485 A JP 11849485A JP 11849485 A JP11849485 A JP 11849485A JP S61278058 A JPS61278058 A JP S61278058A
- Authority
- JP
- Japan
- Prior art keywords
- disk
- magnetic field
- optical head
- permanent magnet
- 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
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
との発明は、円盤状記録媒体（以下単にディスクと称す
る）に磁界を印加しつつ媒体面にレーザ光線を照射して
熱磁気記録を行う光磁気記録再生装置に関し、特に媒体
への磁界印加機構の改良に関する。Detailed Description of the Invention The invention in the field of industrial application is magneto-optical, which performs thermomagnetic recording by applying a magnetic field to a disc-shaped recording medium (hereinafter simply referred to as a disk) and irradiating the medium surface with a laser beam. The present invention relates to a recording/reproducing device, and particularly to an improvement in a mechanism for applying a magnetic field to a medium.
従来の技術
従来、ディスクに垂直に磁界を印加するものとしては、
（４）、ディスク面にレーザ光を集束するだめの対物レ
ンズの周囲に同心に磁界印加用コイルを配置し、光学ヘ
ッドに一体に組み込んだ方式のもの、（Ｂ）、ディヌク
を挾んで光学ヘッドと対向する位置に、光学ヘッドのデ
ィスク半径方向のトレース領域をカバーする長さの永久
磁石を配設した方式のもの、
（Ｃ）、（Ｂ）と略同−の構造で、永久磁石に加えて、
ヨーク体にコイルを巻き付は磁界印加用磁気回路を構成
（〜だ方式のもの、
等が採用されている。Conventional technology Conventionally, in order to apply a magnetic field perpendicularly to a disk, (4) a coil for applying a magnetic field is placed concentrically around an objective lens that focuses laser light on the disk surface, and is integrated into an optical head. (B), a method in which a permanent magnet with a length that covers the tracing area of the optical head in the radial direction of the disk is placed at a position facing the optical head while sandwiching the Dinuk; (C) ), has almost the same structure as (B), but in addition to the permanent magnet,
A coil is wound around the yoke body to form a magnetic circuit for applying a magnetic field (a type of magnetic field is used).
発明が解決しようとする問題点
しかしながら、従来の囚の方式では、情報の記録・消去
に要求される大きい印加磁界を得るために、磁界印加用
コイルの巻数をかなり多くする必要があり、光学ヘッド
自体が大型化および重量化してしまうものであった。こ
れは、ビデオディスクの利点であるランダムアクセス系
の高速化を図る面において極めて不利な要因となる。Problems to be Solved by the Invention However, in the conventional method, in order to obtain the large applied magnetic field required for recording and erasing information, it is necessary to considerably increase the number of turns of the magnetic field application coil, and the optical head The device itself becomes large and heavy. This is an extremely disadvantageous factor in achieving high speed random access, which is an advantage of video discs.
この点において、従来の（Ｂ）あるいはＣ）の方式では
、ディスクへの磁界印加用磁気回路を光学ヘッドと別途
に設けて構成しているので、光学ヘッドを光学系と対物
レンズアクチュエータとで概略構成でき、光学レンズの
小型化および軽量化を容易に図ることができる。In this respect, in the conventional method (B) or C), the magnetic circuit for applying a magnetic field to the disk is provided separately from the optical head, so the optical head is roughly composed of the optical system and the objective lens actuator. The optical lens can be easily made smaller and lighter.
しかし、（Ｂ） −（０の方式は、ディスクへの磁界の
印加を行う磁気回路系の磁極がディスク面と常時路一定
の間隔になるように、磁界印加用磁気回路を配設したも
のであるため、ディスクの回転により生じる面ブレによ
りディスクと磁極との間隔が変化すると、ディスクに印
加する磁界を均一化できないものであった。この点にお
いて、（４）の方式では、印加用コイルに流す電流量を
制御する等により可能であるが、前述したとおり光学ヘ
ッドの大型・重量化によるランダムアクセス系に支障を
来すという問題点があった。However, in the method (B)-(0), the magnetic circuit for applying the magnetic field is arranged so that the magnetic pole of the magnetic circuit system that applies the magnetic field to the disk is always at a constant distance from the disk surface. Therefore, if the distance between the disk and the magnetic pole changes due to surface wobbling caused by the rotation of the disk, the magnetic field applied to the disk cannot be made uniform. This is possible by controlling the amount of current flowing, but as mentioned above, there is a problem in that the increased size and weight of the optical head interferes with the random access system.
この発明は、以上の点に鑑みてなされたもので、光学ヘ
ッドを大型・重量化することなく、ディスク（円盤状記
録媒体）への印加磁界を常時均一化することを目的とし
ている。The present invention has been made in view of the above points, and aims to make the magnetic field applied to a disk (disc-shaped recording medium) uniform at all times without increasing the size and weight of the optical head.
問題点を解決するだめの手段
以上の目的を達成するために、この発明は円盤状記録媒
体（ディスク）に磁界を印加しつつディスク面をレーザ
光線で照射して熱磁気記録を行う装置において、ディス
ク面の半径方向にアクセスしながらこのディスク面にレ
ーザ光を照射し情報の記録・再生・消去を行う光学ヘッ
ドと、この光学ヘッドの対物レンズの周囲に同心に設け
た磁界印加用補助コイルと、ディスクを挾んで光学ヘッ
ドと対向する位置に、光学ヘッドのアクセス領域をカバ
ーする長さで配設した永久磁石とからなり、この永久磁
石と磁界印加用補助コイルとでディスクへの垂直印加磁
界を補正し、常時均一化できるように構成した。In order to achieve an objective that is more than just a means to solve the problem, the present invention provides an apparatus for performing thermomagnetic recording by applying a magnetic field to a disk-shaped recording medium (disk) and irradiating the disk surface with a laser beam. An optical head that records, reproduces, and erases information by irradiating the disk surface with laser light while accessing the disk surface in the radial direction, and an auxiliary coil for applying a magnetic field installed concentrically around the objective lens of this optical head. , consists of a permanent magnet disposed at a position facing the optical head with a length that covers the access area of the optical head, and this permanent magnet and an auxiliary coil for applying a magnetic field apply a magnetic field perpendicularly to the disk. It is configured so that it can be corrected and made uniform at all times.
作用
以上の構成による本発明の光磁気記録再生装置によれば
、ディスクを挾む一方で永久磁石により一定の磁界を印
加し、例えば光学ヘッドに設けたフォーカスエラー信号
の検出によりディスクの面ブレ検出を行い、この検出信
号により他方の光学ヘッド１ｌｌｌ Ｋ設けた磁界印加
用補助コイルの励磁電流を制御する。そうすれば、ディ
スクの面ブレによって生じるディスク面と永久磁石の磁
極との間隔の変動による磁界変動を磁界印加用補助コイ
ルの励磁により制御し、ディスクへの印加磁界を一定に
することができる。According to the magneto-optical recording and reproducing apparatus of the present invention having the above-described structure, a constant magnetic field is applied by a permanent magnet while the disk is held between the disks, and surface wobbling of the disk is detected by detecting a focus error signal provided in the optical head, for example. This detection signal controls the excitation current of the auxiliary coil for applying a magnetic field provided in the other optical head 1llllK. In this way, magnetic field fluctuations due to variations in the distance between the disk surface and the magnetic poles of the permanent magnets caused by surface wobbling of the disk can be controlled by excitation of the magnetic field applying auxiliary coil, and the magnetic field applied to the disk can be kept constant.
実施例 以下、この発明の実施例を図面を参照して説明する。Example Embodiments of the present invention will be described below with reference to the drawings.
第１図、第２図は、本発明に係る光磁気記録再生装置の
一実施例を示すもので、１ｏはディスク回転駆動体、１
２は光学ヘッド、Ｄはディスクを示している。1 and 2 show an embodiment of the magneto-optical recording and reproducing apparatus according to the present invention, in which 1o is a disk rotation drive body;
2 represents an optical head, and D represents a disk.
ディスクＤは、ガラス材料等の透明基板り、と、その基
板り、上にＧａ、 Ｔｂ、 Ｃｏ、 Ｆｅ 等の光磁
気薄膜Ｄ２を蒸着して成り、ディスクＤの周方向にトラ
ラフ溝が形成されている。ディスクＤは回転ｆｆｉ動体
１０の駆動軸に設けたターンテーブル１１上に装填され
、回転駆動される。The disk D is made of a transparent substrate made of a glass material or the like, and a magneto-optical thin film D2 made of Ga, Tb, Co, Fe, etc. is deposited on the substrate, and a trough groove is formed in the circumferential direction of the disk D. ing. The disk D is loaded onto a turntable 11 provided on the drive shaft of the rotating ffi moving body 10, and is driven to rotate.
光学ヘッド１２ば、平行に配設したガイドシャツ）１３
．１３に摺動可能に装着され、送り機構１４によりディ
スクＤの半径方向にアクセスされる。光学ヘッド１２に
は、対物レンズ１５及びこの対物レンズ１５のビームス
ポットがディスクＤのトラックを正しく追従させると共
に正しく焦点合わせさせるように制御する対物レンズア
クチュエータ（図示せず）が設けられている。きらに、
図示しないレーザ光源及びとのレーザ光を対物レンズ１
５に導くと共にディスクＤからの反射戻り光をエラー信
号検出系に導く光学系が内蔵されている。この光学ヘッ
ド１２で対物レンズ１５を通してディスクＤのトラック
にレーザ光のスポットを照射し、トラックをトレースし
つつディスクＤの半径方向にアクセスして、情報の記録
・再生および消去が行われる。Optical head 12 (guide shirt arranged in parallel) 13
．． 13, and is accessed in the radial direction of the disk D by a feeding mechanism 14. The optical head 12 is provided with an objective lens 15 and an objective lens actuator (not shown) that controls the beam spot of the objective lens 15 to correctly follow the track of the disk D and focus correctly. Kirani,
A laser light source (not shown) and a laser beam from the objective lens 1
5 and also guides the reflected return light from the disk D to an error signal detection system. This optical head 12 irradiates a spot of laser light onto a track of the disk D through an objective lens 15, and accesses the disk D in the radial direction while tracing the track, thereby recording, reproducing, and erasing information.
対物レンズ１５の周囲には、同心に磁界印加用補助コイ
ル１６が巻き付けられている。さらに、ディスクＤを挾
んで光学ヘッド１２と対向する位置に棒状の永久磁石１
７が光学ヘッド１２と対向する側をＮ極として配設され
ている。永久磁石１７は、光学ヘッド１２のアクセス方
向に沿って光学ヘッドのアクセス領域をカバーする、ゼ
なわちディスクＤの最外周トラックから最内周トラック
捷でのストロークより長くなっている。永久磁石】７け
、ディスクＤがターンテーブルｌｌ上に装填されたとき
、その磁極とディスクＤ面とが一定の間隔となるように
なっている。An auxiliary coil 16 for applying a magnetic field is wound concentrically around the objective lens 15. Further, a rod-shaped permanent magnet 1 is placed at a position facing the optical head 12 while sandwiching the disk D.
7 is arranged with the side facing the optical head 12 serving as the north pole. The permanent magnet 17 covers the access area of the optical head 12 along the access direction of the optical head 12, ie, has a longer stroke than the distance from the outermost track to the innermost track of the disk D. [Permanent magnet] When the disk D is loaded on the turntable II, its magnetic pole and the surface of the disk D are arranged at a constant distance.
上述の磁界印加用補助コイル１６と永久磁石１７とによ
り、ディスクＤに情報の記録・再生を行う際の垂直磁界
を印加する磁気回路を構成している。The above-described auxiliary magnetic field applying coil 16 and permanent magnet 17 constitute a magnetic circuit that applies a perpendicular magnetic field when recording and reproducing information on the disk D.
なお、永久磁石１７がディスクＤを着脱する際、支障と
寿ら々いようにする構造は、ディスクＤの着脱構造に応
じて容易に想定できるので省略する。It should be noted that a structure that prevents the permanent magnet 17 from interfering with the attachment and detachment of the disk D can be easily assumed depending on the attachment and detachment structure of the disk D, and will therefore be omitted.
次に、以上の本実施例における、ディスクへの磁界の印
加動作について説明する。Next, the operation of applying a magnetic field to the disk in this embodiment will be explained.
ディスクＤへの磁界の印加け、永久磁石１７の磁束の流
れと、補助コイル１６に電流を流し励磁することによっ
て生じる磁束の流れとによって行われる。This is done by applying a magnetic field to the disk D, the flow of magnetic flux from the permanent magnet 17, and the flow of magnetic flux generated by passing a current through the auxiliary coil 16 to excite it.
ディスクＤの回転による面ブレはどのように精度を高め
たとしても避けることができない。このディスクＤの面
ブレにより、固定した永久磁石１７の磁極とディスクＤ
面との間隔が変化する。そうすると、単に永久磁石１７
のみで磁界の印加を行う構成であると、磁極とディスク
面との間隔の変動によね磁界の強さが変動する。この状
態で記録あるいは消去を行うと、記録ビットの大きさに
ムラが生じると共に、消去の際に消去残りが生じてしま
う。そこで、本実施例の如く補助コイル１６により永久
磁石１７の磁束の流れを補助する。Surface wobbling due to the rotation of the disk D cannot be avoided no matter how accurate it is. Due to this surface wobbling of the disk D, the magnetic pole of the fixed permanent magnet 17 and the disk D
The distance from the surface changes. Then, simply the permanent magnet 17
If the configuration is such that the magnetic field is applied only by the disk, the strength of the magnetic field will vary depending on the variation in the distance between the magnetic pole and the disk surface. If recording or erasing is performed in this state, the size of recorded bits will become uneven, and at the time of erasing, unerased data will remain. Therefore, as in this embodiment, the flow of magnetic flux of the permanent magnet 17 is assisted by the auxiliary coil 16.
ディスクＤと永久磁石］７の磁極とが正しい状態のとき
、すなわちディスクＤが面ブレしてないとき、補助コイ
ル１６に一定の電流を流し、永久磁石】７に生じる磁束
の流れがディスクＤ側に大きくなるようにしておく。When the magnetic poles of disk D and permanent magnet [7] are in the correct state, that is, when the disk D has no surface wobbling, a constant current is applied to the auxiliary coil 16, and the flow of magnetic flux generated in permanent magnet [7] is directed to the disk D side. Let it grow to .
そして、ディスクＤが面ブレして永久磁石１７の磁極に
近付けば、補助コイル１６に流す電流を弱め、面ブレし
だ部分で永久磁石１７に生じる磁束が元の永久磁石１７
のみで生じる磁束の流れ状態に近付ける。When the disk D approaches the magnetic pole of the permanent magnet 17 due to surface wobbling, the current flowing through the auxiliary coil 16 is weakened, and the magnetic flux generated in the permanent magnet 17 at the surface wobbling portion returns to the original permanent magnet 17.
This approach approximates the flow state of magnetic flux that occurs when
一方、ディスクＤが永久磁石１７の磁極から遠ざかれば
、補助コイル１６に流す電流を強め、面ブレした部分で
正しい状態の時よりさらに大きくなるようにする。On the other hand, as the disk D moves away from the magnetic pole of the permanent magnet 17, the current applied to the auxiliary coil 16 is strengthened, so that the current becomes larger in the area where the surface is wobbling than in the correct state.
このように、ディスクＤの面ブレによるディスク面と磁
極との間隔の変動に応じて、補助コイル１６に流す電流
の制御を行えば、ディスクＤに印加する磁界を常に一定
にできる。In this way, by controlling the current flowing through the auxiliary coil 16 in accordance with the variation in the distance between the disk surface and the magnetic pole due to surface wobbling of the disk D, the magnetic field applied to the disk D can always be kept constant.
この補助コイル１６に流す電流の制御は、光学ヘッド１
２に備えたフォーカスエラー信号検出系によるフォーカ
スエラー信号により行うことができる。壕だ、ディスク
Ｄの面ブレ検出用の変位検出センサを別途に設けるよう
にしても良い。この変位検出センサは周知のものを用い
ることができる。The current flowing through this auxiliary coil 16 is controlled by the optical head 1.
This can be done using a focus error signal from the focus error signal detection system provided in 2. However, a displacement detection sensor for detecting surface wobbling of the disk D may be provided separately. A well-known displacement detection sensor can be used as this displacement detection sensor.
第３図は、他の実施例を示すもので、１８は永久磁石を
示し、前記実施例と同一部分は同一記号で示し説明は省
略する。FIG. 3 shows another embodiment, in which reference numeral 18 indicates a permanent magnet, and the same parts as in the previous embodiment are denoted by the same symbols and explanations will be omitted.
永久磁石１８は、ディスクＤの半径方向に摺動可能にガ
イド部材１９に装着され、駆動機構２０によって駆動さ
れる。永久磁石１８は、必要最小限の大きさに形成され
、光学ヘッド１２の対物レンズ１５と対向する位置で、
ディスクＤを挾んで光学ヘッド１２と同期して同方向に
駆動されるようになっている。The permanent magnet 18 is attached to a guide member 19 so as to be slidable in the radial direction of the disk D, and is driven by a drive mechanism 20. The permanent magnet 18 is formed to the minimum required size, and is located at a position facing the objective lens 15 of the optical head 12.
It is designed to sandwich the disk D and be driven in synchronization with the optical head 12 in the same direction.
−１０＝
この構成によると、磁界の印加を要する記録および消去
時に、光学ヘッド１２と同期してアクセスし、不要であ
る再生時にはディスクＤかう外しておくことができる。-10= According to this configuration, access can be made in synchronization with the optical head 12 during recording and erasing that requires the application of a magnetic field, and the disk D can be removed during unnecessary reproduction.
第４図は、さらに他の実施例を示すもので、垂直磁界印
加用磁気回路を構成する永久磁石２１を両側を下方に折
曲した断面略コ字状のヨーク体２２の内面に磁極となる
棒状のヨーク体２３を長手方向に沿って取り付けた断面
路Ｅ字状に形成されている。FIG. 4 shows still another embodiment, in which a permanent magnet 21 constituting a magnetic circuit for applying a vertical magnetic field is bent downward on both sides to form a magnetic pole on the inner surface of a yoke body 22 having a substantially U-shaped cross section. It has an E-shaped cross section with a rod-shaped yoke body 23 attached along the longitudinal direction.
このように、永久磁石を単体で用いず、ヨーク体を取り
付けて形成しても良い。これによると、磁束の漏れを少
なくでき、磁気効率が良くなる。In this way, the permanent magnet may not be used alone, but may be formed by attaching a yoke body. According to this, leakage of magnetic flux can be reduced and magnetic efficiency can be improved.
なお、本実施例において、光学ヘッドに設けた磁界印加
用補助コイルは、永久磁石の磁束に補助的効果を与える
ものであり、コイルの巻き数は少なくて良く、光学ヘッ
ドを大型化・重量化することけ々い。また、コイルに流
す励磁電流も小さくて良い。In addition, in this embodiment, the auxiliary coil for applying a magnetic field provided in the optical head gives an auxiliary effect to the magnetic flux of the permanent magnet, and the number of turns of the coil may be small, making the optical head larger and heavier. There's so much to do. Further, the excitation current flowing through the coil may also be small.
発明の詳細
な説明したとおり、本発明の光磁気記録再生装置により
、げ、ディスク（円盤状記録媒体）の回転による面ブレ
に対して、ディスクに印加する磁界の強さを常時均一に
できる。したがって、記録ビットを均一にできるので、
確実に消去できると共に、安定した記録・再生を行うこ
とができる。As described in detail, the magneto-optical recording and reproducing apparatus of the present invention can always make the strength of the magnetic field applied to the disk uniform, even against surface wobbling due to the rotation of the disk (disk-shaped recording medium). Therefore, recording bits can be made uniform, so
Not only can data be erased reliably, but also stable recording and playback can be performed.
第１図は本発明に係る光磁気記録再生装置を示す側面図
、第２図はその磁界印加用磁気回路を示す拡大断面図、
第３図は本発明における他の実施例を示す側面図、第４
図はづらに他の実施例を示す要部部品の斜視図である。
１０・・・・・・回転駆動体、
１１・・・・・ ターンテーブル、
１２・・・・・・光学ヘッド、
１５・・・・・対物レンズ、
Ｄ・・・・・・・・ディスク（記録媒体）。
第１ｖ！Ｊ
第２図
第３ｖ！ＪFIG. 1 is a side view showing a magneto-optical recording/reproducing device according to the present invention, FIG. 2 is an enlarged sectional view showing a magnetic circuit for applying a magnetic field,
Fig. 3 is a side view showing another embodiment of the present invention; Fig. 4 is a side view showing another embodiment of the present invention;
The figure is a perspective view of main parts showing another embodiment. 10... Rotating drive body, 11... Turntable, 12... Optical head, 15... Objective lens, D... Disc ( recoding media). 1st v! J Figure 2 3v! J
Claims (3)
ーザ光線で照射して熱磁気記録を行う装置において、前
記媒体面の半径方向にアクセスしながらこの媒体面にレ
ーザ光を照射し情報の記録・再生・消去を行う光学ヘッ
ドと、この光学ヘッドの対物レンズの周囲に同心に設け
た磁界印加用補助コイルと、前記記録媒体を挾んで前記
光学ヘッドと対向する位置に、前記光学ヘッドのアクセ
ス領域をカバーする長さを有して配設された永久磁石と
からなり、この永久磁石と前記磁界印加用補助コイルと
で媒体への垂直印加磁界を補正するようにしたことを特
徴とする光磁気記録再生装置。(1) In a device that performs thermomagnetic recording by applying a magnetic field to a disk-shaped recording medium and irradiating the medium surface with a laser beam, the medium surface is irradiated with a laser beam while accessing the medium surface in the radial direction. an optical head for recording, reproducing, and erasing information; an auxiliary coil for applying a magnetic field provided concentrically around the objective lens of the optical head; A permanent magnet is provided with a length that covers the access area of the head, and the magnetic field applied perpendicularly to the medium is corrected by this permanent magnet and the magnetic field application auxiliary coil. A magneto-optical recording and reproducing device.
界変化感知可能な必要最小の長さにし、光学ヘッドと共
に記録媒体面に沿つてアクセスするようにした特許請求
の範囲第（１）項記載の光磁気記録再生装置。(2) According to claim (1), the permanent magnet is made to have the necessary minimum length to be able to sense changes in the magnetic field due to the excitation of the auxiliary coil, and is accessed along the surface of the recording medium together with the optical head. magneto-optical recording and reproducing device.
長手方向に沿つて取り付けてなる特許請求の範囲第（１
）項または第（２）項記載の光磁気記録再生装置。(3) The permanent magnet is attached inside the channel-shaped yoke body along the longitudinal direction.
) or (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11849485A JPS61278058A (en) | 1985-05-31 | 1985-05-31 | Photomagnetic recording/reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11849485A JPS61278058A (en) | 1985-05-31 | 1985-05-31 | Photomagnetic recording/reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61278058A true JPS61278058A (en) | 1986-12-08 |
Family
ID=14738058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11849485A Pending JPS61278058A (en) | 1985-05-31 | 1985-05-31 | Photomagnetic recording/reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61278058A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4807204A (en) * | 1986-07-07 | 1989-02-21 | Brother Kogyo Kabushiki Kaisha | Magneto-optical recording medium having pairs of mutually corresponding recording segments, and apparatus for recording information on the medium |
| JPH0227548A (en) * | 1988-07-15 | 1990-01-30 | Nikon Corp | Miniaturized ow type magneto-optical recorder |
| US4914643A (en) * | 1986-11-20 | 1990-04-03 | Ricoh Company, Ltd. | Overwriting photomagnetic recording apparatus having single light source and fixed-field generator |
| US4928192A (en) * | 1987-12-23 | 1990-05-22 | Konica Corporation | Process for identifying disks and automatically configuring a disk drive system |
| US4993009A (en) * | 1986-07-14 | 1991-02-12 | Canon Kabushiki Kaisha | Opto-magnetic recording apparatus with a bias magnetic field generating means movable parallel to a recording surface of a recording medium |
-
1985
- 1985-05-31 JP JP11849485A patent/JPS61278058A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4807204A (en) * | 1986-07-07 | 1989-02-21 | Brother Kogyo Kabushiki Kaisha | Magneto-optical recording medium having pairs of mutually corresponding recording segments, and apparatus for recording information on the medium |
| US4993009A (en) * | 1986-07-14 | 1991-02-12 | Canon Kabushiki Kaisha | Opto-magnetic recording apparatus with a bias magnetic field generating means movable parallel to a recording surface of a recording medium |
| US4914643A (en) * | 1986-11-20 | 1990-04-03 | Ricoh Company, Ltd. | Overwriting photomagnetic recording apparatus having single light source and fixed-field generator |
| US4928192A (en) * | 1987-12-23 | 1990-05-22 | Konica Corporation | Process for identifying disks and automatically configuring a disk drive system |
| JPH0227548A (en) * | 1988-07-15 | 1990-01-30 | Nikon Corp | Miniaturized ow type magneto-optical recorder |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0468693B2 (en) | ||
| JPS61278058A (en) | Photomagnetic recording/reproducing device | |
| JP2801338B2 (en) | Magneto-optical recording device | |
| JPH0687323B2 (en) | Magneto-optical recording / reproducing device | |
| JP2794876B2 (en) | Flying magnetic head position controller | |
| JP2849160B2 (en) | Magneto-optical recording / reproducing device | |
| JPS61278059A (en) | Photomagnetic recording/reproducing device | |
| JP2791171B2 (en) | Magneto-optical recording device | |
| JP2685471B2 (en) | Magneto-optical storage device | |
| JP2901266B2 (en) | Magnetic head-disk distance control device | |
| JP2589626B2 (en) | Optical means driving device | |
| JP2746306B2 (en) | Magneto-optical recording / reproducing device | |
| JPS6132244A (en) | Photomagnetic recording device | |
| JP2658866B2 (en) | Magneto-optical storage method | |
| JPS60147948A (en) | Photo-electro-magnetic recording device | |
| JP2659012B2 (en) | Optical disk drive | |
| JPH0512779B2 (en) | ||
| JPH02193345A (en) | Magneto-optical recording medium driving device | |
| JPS62149058A (en) | Photomagnetic recording and reproducing device | |
| JPH05225642A (en) | Magneto-optical disk device | |
| JPH06251386A (en) | Magneto-optic disk apparatus, and magneto-optic head and rotating recording medium thereof | |
| JPH04241241A (en) | Magneto-optical information recording and reproducing device | |
| JPH03205637A (en) | Magneto-optical disk device | |
| JPH077535B2 (en) | Magneto-optical recording device | |
| JPH0660607A (en) | Magneto-optic recording/reproducing device |