JP2804476B2 - Magneto-optical recording medium and its initialization method - Google Patents
Magneto-optical recording medium and its initialization methodInfo
- Publication number
- JP2804476B2 JP2804476B2 JP63101253A JP10125388A JP2804476B2 JP 2804476 B2 JP2804476 B2 JP 2804476B2 JP 63101253 A JP63101253 A JP 63101253A JP 10125388 A JP10125388 A JP 10125388A JP 2804476 B2 JP2804476 B2 JP 2804476B2
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- recording medium
- guide groove
- optical recording
- initializing
- 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
- 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
- G11B11/10526—Bulk initialisation or erasing, e.g. at least one whole information track with a single action
-
- 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
-
- 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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は磁気光学効果により信号の記録・再生が行な
われるディスク状、カード状の光磁気記録媒体およびそ
の初期化方法に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped or card-shaped magneto-optical recording medium on or from which a signal is recorded / reproduced by a magneto-optical effect, and to an initialization method therefor.
高密度記録可能なメモリ媒体として光磁気タイプが知
られている。このタイプの媒体は、第２図に示されるよ
うにトラッキング制御用の案内溝（グルーブ部）６と信
号記録トラック（ランド部）７とを有し、この信号記録
トラック７は案内溝６間に設けられ、いわゆる溝間記録
が行なわれるようになっている。情報の記録、再生はビ
ーム８の移動により行なわれる。A magneto-optical type is known as a memory medium capable of high-density recording. As shown in FIG. 2, this type of medium has a guide groove (groove portion) 6 for tracking control and a signal recording track (land portion) 7, and the signal recording track 7 is located between the guide grooves 6. The so-called inter-groove recording is performed. Recording and reproduction of information are performed by moving the beam 8.
使用前のディスク、または記録済のディスクに新たに
情報を記録する場合、記録トラック７の磁性層の磁化の
向きを一度消去方向に一律にそろえ、初期化しなければ
ならない。When information is newly recorded on a disc before use or on a recorded disc, the magnetization direction of the magnetic layer of the recording track 7 must be once aligned in the erasing direction and initialized.
従来、この初期化は、バイアス用コイルを用いて光磁
気記録媒体に対して消去方向に磁場を印加し、この状態
において、光出力が記録時と同等またはそれ以上の連続
ビームを照射して磁性層の温度を上昇させることによ
り、その部分の保磁力を低下させ、磁化の向きを上述の
磁場の向きにそろえることにより行なわれている。Conventionally, this initialization involves applying a magnetic field in the erasing direction to the magneto-optical recording medium using a bias coil, and in this state, irradiating a continuous beam with an optical output equal to or greater than that at the time of recording. By increasing the temperature of the layer, the coercive force of that portion is reduced, and the magnetization is aligned with the direction of the above-described magnetic field.
しかしながら、従来の消去では案内溝（グルーブ部）
における磁性層の磁化は消去方向にそろっていないた
め、この部分の磁化の不整合が再生信号にノイズとして
あらわれ、その結果C/N比（追Carrier to NoiseRati
o;ディスクに単一周波数の信号を記録し、再生して、一
定の帯域の測定系でスペクトル分析したときの信号対雑
音比）が低下してしまうという問題点があった。However, in conventional erasing, guide grooves (groove portions)
Since the magnetization of the magnetic layer at the point is not aligned with the erasing direction, the mismatch of the magnetization at this portion appears as noise in the reproduced signal, and as a result, the C / N ratio (Carrier to Noise Ratio)
o; There is a problem that a signal of a single frequency is recorded on a disk, reproduced, and the signal-to-noise ratio when a spectrum is analyzed by a measurement system of a certain band is reduced.
本発明の光磁気記録媒体の初期化方法は、初期化に際
し、案内溝部における磁化の向きを消去方向にそろえ、
初期化することを特徴とする。The initialization method of the magneto-optical recording medium of the present invention, upon initialization, aligning the direction of magnetization in the guide groove to the erasing direction,
It is characterized by initialization.
また、案内溝部上および信号記録用トラック部上に、
それぞれ第１および第２のレーザヘッドを設け、該第１
および第２のレーザヘッドから前記案内未溝部および信
号記録用トラック部の磁性層にレーザ光を照射し、それ
ぞれの部分の初期化を同時に行なうことを特徴とする。Also, on the guide groove and the signal recording track,
First and second laser heads are provided, respectively,
And irradiating a laser beam from the second laser head to the guide non-groove portion and the magnetic layer of the signal recording track portion, thereby simultaneously initializing the respective portions.
案内溝部における磁性層の磁化も消去方向にそろえら
れるため、この部分が再生信号に与える悪影響が排除さ
れ、C/N比の低下が防止される。また、案内溝および信
号記録用トラックの消去を同時に行なうことにより、初
期化時間の増大を防止できる。Since the magnetization of the magnetic layer in the guide groove is also aligned in the erasing direction, the adverse effect of this portion on the reproduction signal is eliminated, and a decrease in the C / N ratio is prevented. Further, by simultaneously erasing the guide groove and the signal recording track, it is possible to prevent an increase in the initialization time.
次に、本発明の実施例について図面を参照して説明す
る。Next, embodiments of the present invention will be described with reference to the drawings.
実施例１ 第１図は本発明の一実施例の構成を示す図である。Embodiment 1 FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.
光磁気ディスク１はスピンドル４を中心として回転可
能に載置されており、案内溝6,記録トラック７上には磁
性層９が設けられている。また、この光磁気ディスク１
の初期化を行なう手段として、バイアス用コイル5a,5b
および記録トラック消去用レーザヘッド2,案内溝消去用
レーザヘッド３が設けられている。バイアス用コイル5
a,5bはそれぞれ、記録トラック７上，案内溝６上におい
て、径方向に対向して設けられている。また、レーザヘ
ッド2,3は、バイアス用コイル5a,5bの反対側において同
様の位置関係を有して設けられている。The magneto-optical disk 1 is mounted so as to be rotatable around a spindle 4, and a magnetic layer 9 is provided on the guide groove 6 and the recording track 7. The magneto-optical disk 1
The bias coils 5a and 5b
Further, a recording track erasing laser head 2 and a guide groove erasing laser head 3 are provided. Bias coil 5
a and 5b are provided on the recording track 7 and the guide groove 6 so as to face each other in the radial direction. The laser heads 2 and 3 are provided on the opposite side of the bias coils 5a and 5b with the same positional relationship.
次に、本実施例の初期化方法を説明する。 Next, an initialization method according to the present embodiment will be described.
バイアス用コイル5a,5bに電流を流して同一方向の磁
場を発生させ、この状態で記録トラック消去用レーザヘ
ッド2,案内溝消去用レーザヘッド３からレーザビームを
記録トラック７および案内溝６上の磁性層９に照射す
る。このレーザビームの照射により磁性層９の温度が上
昇し、これにともなって当該部分の保磁力が低下し、バ
イアス用コイル5a,5bによるバイアス磁場より低くなる
と磁化の向きがそのバイアス磁場の方向に一律にそろえ
られ、これにより初期化が行なわれる。これをディスク
１の全周に対して行なうことにより、記録トラック７お
よび案内溝６の同時消去を行なうことができる。A current is applied to the bias coils 5a and 5b to generate a magnetic field in the same direction. In this state, a laser beam is emitted from the recording track erasing laser head 2 and the guide groove erasing laser head 3 onto the recording track 7 and the guide groove 6. Irradiate the magnetic layer 9. The irradiation of the laser beam raises the temperature of the magnetic layer 9, thereby lowering the coercive force of the portion, and when the temperature is lower than the bias magnetic field generated by the bias coils 5 a and 5 b, the direction of magnetization changes to the direction of the bias magnetic field. They are uniformly aligned, thereby performing initialization. By performing this for the entire circumference of the disk 1, the recording tracks 7 and the guide grooves 6 can be simultaneously erased.
実施例２ 実施例１ではヘッドを２つ用いて記録トラック（グル
ーブ部）および案内溝（ランド部）を同時に消去した
が、必ずしもこれに限定されるものではなく、１つのヘ
ッドを用いてグルーブ部とランド部の順次消去してもよ
い。この場合、初期化手段を簡素化できる。また、レー
ザヘッドの位置は必ずしも対向して設けられる必要はな
く、ディスク上の任意の位置でよい。また、上述の例で
は初期化としてグルーブ部およびランド部を消去してい
るが、案内溝（グルーブ部）のみを消去しておき、記録
部（ランド部）はデータの書き込み直前の消去のときに
行なってもよい。Second Embodiment In the first embodiment, the recording tracks (groove portions) and the guide grooves (land portions) are simultaneously erased by using two heads. However, the present invention is not limited to this. And land portions may be sequentially erased. In this case, the initialization means can be simplified. In addition, the position of the laser head does not necessarily need to be provided to face, and may be an arbitrary position on the disk. In the above example, the groove and the land are erased as initialization. However, only the guide groove (groove) is erased, and the recording (land) is erased immediately before data is written. You may do it.
以上説明したように本発明は、案内溝上にある磁性層
の磁化の向きを消去方向にそろえることにより、再生信
号のC/N比の低下を防止することができる。As described above, the present invention can prevent a decrease in the C / N ratio of a reproduction signal by aligning the magnetization direction of the magnetic layer on the guide groove with the erasing direction.
第１図は本発明の一実施例の構成を示す図、 第２図は光磁気ディスクの基本構成ならびにレーザビー
ムによる初期化方法を説明するための図である。 １……光磁気ディスク、 ２……記録トラック消去用レーザヘッド、 ３……案内溝消去用レーザヘッド、 ４……スピンドル、 5a,5b……バイアス用コイル、 ６……案内溝、 ７……記録トラック、 ８……レーザビーム。FIG. 1 is a diagram showing a configuration of an embodiment of the present invention, and FIG. 2 is a diagram for explaining a basic configuration of a magneto-optical disk and an initialization method using a laser beam. DESCRIPTION OF SYMBOLS 1 ... Magneto-optical disk, 2 ... Laser head for erasing recording tracks, 3 ... Laser head for erasing guide grooves, 4 ... Spindle, 5a, 5b ... Coil for bias, 6 ... Guide grooves, 7 ... Recording track, 8 ... Laser beam.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−220160（ＪＰ，Ａ) 特開 昭63−181146（ＪＰ，Ａ) 特開 昭63−37839（ＪＰ，Ａ) 特開 昭63−83940（ＪＰ，Ａ) 特開 昭63−222350（ＪＰ，Ａ) 特開 昭63−308755（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G11B 11/10──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-220160 (JP, A) JP-A-63-181146 (JP, A) JP-A-63-37839 (JP, A) JP-A-63-37839 83940 (JP, A) JP-A-63-222350 (JP, A) JP-A-63-308755 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) G11B 11/10
Claims (4)
媒体において、前記トラック部および前記トラック部間
における磁化の向きが消去方向に初期化されていること
を特徴とする光磁気記録媒体。1. A magneto-optical recording medium having a signal recording track portion, wherein a direction of magnetization between the track portions and between the track portions is initialized to an erasing direction.
部の間に位置する信号記録用トラック部とを有する光磁
気記録媒体の初期化方法において、 前記信号記録用トラック部および前記案内溝部における
磁化の向きを消去方向にそろえ、初期化することを特徴
とする光磁気記録媒体の初期化方法。2. A method for initializing a magneto-optical recording medium having a tracking control guide groove and a signal recording track located between the guide grooves, wherein the magnetization in the signal recording track and the guide groove is performed. A method for initializing a magneto-optical recording medium, comprising: aligning the direction of an optical disc with an erasing direction;
部の間に位置する信号記録用トラック部とを有する光磁
気記録媒体の初期化方法において、 前記案内溝部上および信号記録用トラック部上に、それ
ぞれ第１および第２のレーザヘッドを設け、該第１およ
び第２のレーザヘッドから前記案内溝部および信号記録
用トラック部にレーザ光を照射し、それぞれの部分を消
去方向に同時に初期化することを特徴とする光磁気記録
媒体の初期化方法。3. A method for initializing a magneto-optical recording medium having a tracking control guide groove and a signal recording track positioned between the guide grooves, the method comprising: First and second laser heads are provided, respectively, and the first and second laser heads irradiate the guide groove and the signal recording track with laser light, and the respective portions are simultaneously initialized in the erasing direction. A method for initializing a magneto-optical recording medium.
部の間に位置する信号記録用トラック部とを有する光磁
気記録媒体の初期化方法において、 １つのレーザヘッドを設け、該レーザヘッドから前記案
内溝部および信号記録用トラック部にレーザ光を順次照
射し、それぞれの部分における磁化の向きを消去方向に
そろえ、初期化を順次に行なうことを特徴とする光磁気
記録媒体の初期化方法。4. A method for initializing a magneto-optical recording medium having a tracking control guide groove and a signal recording track located between the guide grooves, wherein one laser head is provided. A method for initializing a magneto-optical recording medium, comprising sequentially irradiating a laser beam onto a guide groove and a signal recording track, aligning the magnetization directions of the respective portions in an erasing direction, and sequentially performing initialization.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63101253A JP2804476B2 (en) | 1988-04-26 | 1988-04-26 | Magneto-optical recording medium and its initialization method |
| EP19890303971 EP0339875B1 (en) | 1988-04-26 | 1989-04-21 | Method and apparatus for initializing intermediate region between tracks on magnetooptical recording medium |
| DE1989612390 DE68912390T2 (en) | 1988-04-26 | 1989-04-21 | Method and device for initializing an area lying between the tracks of a magneto-optical recording medium. |
| US08/082,507 US5309416A (en) | 1988-04-26 | 1993-06-25 | Method and apparatus for initializing intermediate region between tracks on magnetooptical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63101253A JP2804476B2 (en) | 1988-04-26 | 1988-04-26 | Magneto-optical recording medium and its initialization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01273251A JPH01273251A (en) | 1989-11-01 |
| JP2804476B2 true JP2804476B2 (en) | 1998-09-24 |
Family
ID=14295751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63101253A Expired - Lifetime JP2804476B2 (en) | 1988-04-26 | 1988-04-26 | Magneto-optical recording medium and its initialization method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2804476B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01279446A (en) * | 1988-04-30 | 1989-11-09 | Nec Home Electron Ltd | Method and apparatus for recording and reproducing optical information |
| JPH01286152A (en) * | 1988-05-12 | 1989-11-17 | Nec Corp | Magneto-optical disk manufacture equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01220160A (en) * | 1988-02-26 | 1989-09-01 | Nec Corp | Device for manufacturing magneto-optical disk |
-
1988
- 1988-04-26 JP JP63101253A patent/JP2804476B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01273251A (en) | 1989-11-01 |
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