JPH0756708B2 - Magneto-optical disk and its recording device - Google Patents

Magneto-optical disk and its recording device

Info

Publication number
JPH0756708B2
JPH0756708B2 JP60084822A JP8482285A JPH0756708B2 JP H0756708 B2 JPH0756708 B2 JP H0756708B2 JP 60084822 A JP60084822 A JP 60084822A JP 8482285 A JP8482285 A JP 8482285A JP H0756708 B2 JPH0756708 B2 JP H0756708B2
Authority
JP
Japan
Prior art keywords
recording
magneto
reproducing
track
laser power
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
Application number
JP60084822A
Other languages
Japanese (ja)
Other versions
JPS61243974A (en
Inventor
重和 峯近
研示 虎沢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP60084822A priority Critical patent/JPH0756708B2/en
Publication of JPS61243974A publication Critical patent/JPS61243974A/en
Publication of JPH0756708B2 publication Critical patent/JPH0756708B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/30—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture with provision for auxiliary signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • G11B27/3063—Subcodes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2525—Magneto-optical [MO] discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2545—CDs

Landscapes

  • Optical Recording Or Reproduction (AREA)

Description

【発明の詳細な説明】 （イ）産業上の利用分野 本発明は記録レーザーパワー情報を再生専用トラックと
して形成して成る光磁気ディスクと、その記録装置に関
する。The present invention relates to a magneto-optical disk formed by recording recording laser power information as a read-only track, and a recording apparatus therefor.

（ロ）従来の技術 光ディスクに対して最適レーザパワーで記録を行う為に
テストエリアを設け、このテストエリアにて記録再生を
行った結果を評価して最適レーザパワーを決定する技術
については、特開昭57−141035号に開示されている。(B) Conventional technology There is a special technique for determining the optimum laser power by providing a test area for recording on the optical disc with the optimum laser power and evaluating the result of recording and reproducing in this test area. It is disclosed in Japanese Patent Application Laid-Open No. 57-141035.

しかし、この従来技術の場合、最適レーザパワーを設定
の為に、記録再生を含めた面倒な評価作業が必要となる
ばかりか、全ての記録装置に評価手段を設けねばならな
いばかりか、記録レーザパワーが大きくなった場合テス
トエリアの記録膜を損傷する虞がある。However, in the case of this conventional technique, in order to set the optimum laser power, not only a troublesome evaluation work including recording and reproduction is required, but also not only an evaluation means must be provided in all recording devices, but also the recording laser power If it becomes large, the recording film in the test area may be damaged.

そこで、同一記録材料で同一構成の光磁気ディスクは、
最適レーザパワーも共通であることに鑑み、光磁気ディ
スクの記録材料の組成や構造に応じて決まるレーザパワ
ーを光磁気ディスクの一部に記録することにより、評価
時間と評価手段と省略することが考えられる。Therefore, a magneto-optical disk with the same recording material and the same structure,
In view of the fact that the optimum laser power is also common, the evaluation time and the evaluation means can be omitted by recording the laser power determined according to the composition and structure of the recording material of the magneto-optical disk in a part of the magneto-optical disk. Conceivable.

特開昭58−105427号公報には、光磁気ディスクではない
が、記録材料等が異なる複数種類の磁気記録媒体に対
し、最適記録条件で記録が出来る様に磁気記録媒体の一
部に凸起を形成し、この凸起を機械的に検出して磁気記
録条件を設定する構成が提案されている。Japanese Unexamined Patent Publication No. 58-105427 discloses a magnetic recording medium that is not a magneto-optical disk, but has a convex portion on a part of the magnetic recording medium so that recording can be performed under optimum recording conditions on a plurality of types of magnetic recording media having different recording materials. There has been proposed a structure in which a magnetic recording condition is set by forming a magnetic field and mechanically detecting this protrusion.

しかし、上述する従来例は、条件検出の為に機械的な検
出手段が別途必要となる。However, in the above-mentioned conventional example, a mechanical detecting means is additionally required for condition detection.

（ハ）発明が解決しようとする課題 そこで、記録再生トラック形成に障害とならない様に記
録レーザパワー条件を光磁気ディスクに記録し、記録し
た記録レーザパワー条件が別途検出手段を追加すること
なく然も迅速に検出出来る光磁気ディスクと、その記録
装置を提供する必要がある。(C) Problems to be Solved by the Invention Therefore, the recording laser power condition is recorded on the magneto-optical disk so as not to hinder the formation of the recording / reproducing track, and the recorded recording laser power condition can be recorded without adding a separate detecting means. It is necessary to provide a magneto-optical disk that can be detected rapidly and a recording device therefor.

（ニ）課題を解決する為の手段 そこで、本発明は、記録再生ピックアップにて再生可能
な記録再生トラック形成用のガイドと、前記記録再生ピ
ックアップにて再生可能な再生専用トラックを構成する
凹凸列とを、プラスチック製のディスク基板の表面に成
型し、該ディスク基板上に再記録可能な磁性膜を形成す
る光磁気ディスクに於て、前記凹凸列は、記録レーザパ
ワーの条件に関する情報を含み、前記記録再生トラック
に先行するディスク内周側に、成型される光磁気ディス
クを提案するものである。(D) Means for Solving the Problem Therefore, the present invention provides a guide for forming a recording / reproducing track reproducible by a recording / reproducing pickup, and a concavo-convex array forming a reproduction-only track reproducible by the recording / reproducing pickup. In the magneto-optical disk, which is formed on the surface of a plastic disk substrate and has a re-recordable magnetic film formed on the disk substrate, the concavo-convex row includes information on a condition of recording laser power, The present invention proposes a magneto-optical disk molded on the inner peripheral side of the disk preceding the recording / reproducing track.

更に、本発明は、記録再生トラック形成用のガイドと、
該ガイドに先行するディスク内周側に記録レーザパワー
条件に関する情報を含む再生専用トラックを構成する凹
凸例とを、プラスチック製のディスク基板の表面に成型
し、該ディスク基板上に再記録可能な磁性膜を形成する
光磁気ディスクに情報を記録する記録装置に於いて、記
録動作開始前に、前記再生専用トラックを記録再生ピッ
クアップにて光学再生して前記記録レーザパワーの条件
を検出し、検出した前記条件に基づき前記記録再生ピッ
クアップの記録レーザパワーを設定する記録装置を提案
するものである。Furthermore, the present invention provides a guide for forming a recording / reproducing track,
An example of unevenness forming a read-only track including information about recording laser power conditions on the inner circumference side of the disc preceding the guide is molded on the surface of a plastic disc substrate, and re-recordable magnetic is formed on the disc substrate. In a recording device for recording information on a magneto-optical disk having a film formed thereon, the reproduction-only track is optically reproduced by a recording / reproducing pickup to detect the condition of the recording laser power before the recording operation is started. The present invention proposes a recording apparatus that sets the recording laser power of the recording / reproducing pickup based on the above conditions.

（ホ）作用 よって、本発明によれば、記録媒体の凹凸列を記録再生
用のピックアップにて再生することにより記録再生用ト
ラックにおける記録レーザパワーが設定される。(E) Operation Therefore, according to the present invention, the recording laser power in the recording / reproducing track is set by reproducing the concavo-convex line of the recording medium by the recording / reproducing pickup.

（ヘ）実施例 以下、図面に従い本発明の実施例を説明する。第１図は
情報記録媒体の平面図、第４図は斜視図、第２図は記
録、再生の条件に関する情報の記録されるフォーマット
を示す図、第３図は、第５図は、本発明の情報記録媒体
の利用する情報記録再生装置のブロック図である。(F) Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an information recording medium, FIG. 4 is a perspective view, FIG. 2 is a diagram showing a format in which information relating to recording and reproducing conditions is recorded, FIG. 3 is FIG. 3 is a block diagram of an information recording / reproducing apparatus used by the information recording medium of FIG.

第１図において、（１）は光磁気ディスク（情報記録媒
体）である。中央部分には透孔（２）が設けられてお
り、この透孔（２）が情報記録再生装置にてクランブさ
れ、ディスク（１）が回転される。（３）は光磁気記録
部分であり、その構造は第４図に示す様になっている。
すなわち、案内溝（4a）（この部分が記録再生トラック
となる）の形成されたプラスチック基板（ポリカーボネ
イト、アクリル）（４）にGdTbFe,TbFeCo等の垂直磁化
膜（５）（ハッチングで示す）が蒸着又はスパッタリン
グによって設けられている。そしてこの垂直磁化膜
（５）上には誘電体による保護層（６）が形成されてい
る。In FIG. 1, (1) is a magneto-optical disk (information recording medium). A through hole (2) is provided in the central portion, and the through hole (2) is clamped by the information recording / reproducing apparatus to rotate the disc (1). (3) is a magneto-optical recording portion, and its structure is as shown in FIG.
That is, a perpendicular magnetic film (5) (shown by hatching) such as GdTbFe, TbFeCo is vapor-deposited on a plastic substrate (polycarbonate, acrylic) (4) on which a guide groove (4a) (this portion becomes a recording / reproducing track) is formed. Alternatively, it is provided by sputtering. A protective layer (6) made of a dielectric material is formed on the perpendicular magnetization film (5).

光磁気記録部分（３）の内側には記録、再生の条件に関
する情報信号が記録された既記録部分（７）が設けられ
ている。この既記録部分（７）への情報信号の記録方法
は、コンパクトディスクプレーヤの如く、プラスチック
基板（４）上に凹凸のピット（８）として記録する方法
が考えられる。Inside the magneto-optical recording portion (3), there is provided a pre-recorded portion (7) in which an information signal relating to recording and reproducing conditions is recorded. As a method of recording the information signal on the already-recorded portion (7), a method of recording it as uneven pits (8) on the plastic substrate (4) like a compact disc player can be considered.

以上の記録方法であれば、ディスク（１）からの反射光
量の変化により、既に記録された情報信号を読み取るこ
とができる。凹凸のピットの形で記録する方法は、案内
溝（4a）形成時に、ピットを作成することが可能であ
り、又、消去されるおそれがないので有利である。尚、
レーザ光はプラスチック基板（４）側から矢印Ａの如く
照射される。With the above recording method, the already recorded information signal can be read by the change in the amount of reflected light from the disc (1). The method of recording in the form of uneven pits is advantageous because the pits can be formed when the guide groove (4a) is formed and there is no risk of erasing. still,
Laser light is emitted from the side of the plastic substrate (4) as shown by arrow A.

記録、再生条件に関する情報の記録されるフォーマット
としては、コンパクトディスクも利用できる装置におい
ては、コンパクトディスクのサブコードＱチャンネルの
フォーマットを利用する。サブコードＱチャンネルのフ
ォーマットは第２図に示すものである。このうち、アド
レスの４ビットにおいて、（0001），（0010），（001
1）はコンパクトディスクにとって重要な意味のあるパ
ターンであるが、他のパターンはコンパクトディスクに
とっては意味がない。As a format for recording information on recording / reproducing conditions, in a device that can also use a compact disc, the subcode Q channel format of the compact disc is used. The format of the subcode Q channel is shown in FIG. Of these, in the 4 bits of the address, (0001), (0010), (001
1) is an important pattern for compact discs, but other patterns are meaningless for compact discs.

そこで、光磁気ディスク（１）の既記録部分（７）に
は、サブコードＱチャンネルのフォーマットのアドレス
部分に例えば（1000）のパターンを記録しておく。Therefore, in the recorded portion (7) of the magneto-optical disk (1), for example, a pattern (1000) is recorded in the address portion of the subcode Q channel format.

そして72ビットのデータ部分には、光磁気ディスクの記
録（消去も含む）、再生の条件に関する情報が記録され
る。この情報とは、例えば、記録時、消去時、再生時の
レーザパワー、線速度、バイアス磁界の強さ及び方向に
関するものである。又、特定パターンを記録して光磁気
記録部分（３）のはじまり（又は既記録部分（７）の終
り）を指示せしめることもできる。つまり、特定パター
ンを規準位置を示す印にしたり、光磁気記録部分の開始
部分までの回転数、時間のデータを記録する。In the 72-bit data portion, information on recording (including erasing) and reproducing conditions of the magneto-optical disk is recorded. This information relates to the laser power, the linear velocity, the strength and direction of the bias magnetic field at the time of recording, erasing, and reproducing, for example. It is also possible to record a specific pattern to indicate the beginning of the magneto-optical recording portion (3) (or the end of the recorded portion (7)). That is, the specific pattern is used as a mark indicating the reference position, and the data of the number of rotations and the time until the start of the magneto-optical recording portion are recorded.

記録、再生に関する条件が必要なのは、次の理由によ
る。すなわち、光磁気ディスクの垂直磁化膜の材料とし
ては、前述の様にGdFe,TbFe,TbFeCoなどがあるが、組成
が異なれば、レーザパワー、バイアス磁界の条件は当然
異なってくるし、TbFeCoを基本とする材料でもCoの割合
が増加すればキュリー点が上昇するので記録消去のレー
ザパワーも大きくする必要があるからである。The conditions for recording and reproducing are necessary for the following reasons. That is, as the material of the perpendicular magnetic film of the magneto-optical disk, there are GdFe, TbFe, TbFeCo, etc. as described above, but if the composition is different, the conditions of the laser power and the bias magnetic field will naturally be different. This is because the Curie point also rises as the proportion of Co increases even with the above materials, and it is necessary to increase the laser power for recording and erasing.

従い、記録、消去、再生時のレーザパワー、記録、消去
時のバイアス磁界の強さあるいは必要な線速度を既記録
部分（７）に書込んであれば、情報記録再生装置におい
て、記録材料の異なる光磁気ディスクに対応できる。Therefore, if the laser power at the time of recording, erasing and reproducing, the strength of the bias magnetic field at the time of recording and erasing or the required linear velocity is written in the already recorded portion (7), the Compatible with different magneto-optical disks.

又、記録材料が同じであっても、無記録状態における光
磁気記録部分の磁化の向きが、規格によって異なる場合
も考えられるので、記録時、消去時のバイアス磁界の向
きを指定する情報が記録されることは有効である。In addition, even if the recording materials are the same, the magnetization direction of the magneto-optical recording portion in the non-recorded state may be different depending on the standard. Therefore, information that specifies the direction of the bias magnetic field during recording and erasing is recorded. What is done is effective.

次に第３図に基づき、上記ディスクを利用する情報記録
再生装置について説明する。Next, an information recording / reproducing apparatus using the above disc will be described with reference to FIG.

第３図において（10）はレーザ光源である半導体レー
ザ、（11）はコリメータレンズ、（12）は第１の偏光ビ
ームスプリッタ、（13）は対物レンズ、（14）はディス
ク、（15）は1/2波長板、（16）は偏光ビームスプリッ
タ、（17）（18）は光検出器、（19）（20）は光検出器
（17）（18）の出力を切換える切換スイッチ、（21）は
加算器（非差動型再生回路）、（22）は差動増幅器（差
動型再生回路）、（23）はデコーダ、（24）はコントロ
ール回路である。又、（25）はバイアス磁界の付与手段
である。In FIG. 3, (10) is a semiconductor laser which is a laser light source, (11) is a collimator lens, (12) is a first polarization beam splitter, (13) is an objective lens, (14) is a disc, and (15) is 1/2 wavelength plate, (16) a polarization beam splitter, (17) and (18) photodetectors, (19) and (20) changeover switches for switching the output of photodetectors (17) and (18), and (21 ) Is an adder (non-differential reproducing circuit), (22) is a differential amplifier (differential reproducing circuit), (23) is a decoder, and (24) is a control circuit. Further, (25) is a bias magnetic field applying means.

ディスク（情報記録媒体）を装着すると、このディスク
は光磁気ディスクとコンパクトディスクの２つの可能性
があるので、情報記録再生装置は光磁気ディスクの既記
録部分又はコンパクトディスクのリードイン部の読出し
状態となる。When a disc (information recording medium) is mounted, the disc has two possibilities, a magneto-optical disc and a compact disc. Therefore, the information recording / reproducing apparatus reads the recorded state of the magneto-optical disc or the read-in part of the compact disc. Becomes

すなわち、各切換スイッチ（19）（20）はａ側に制御さ
れ、光検出器（17）（18）の出力は加算器（21）のみに
印加される。そして、ピックアップ（26）は、読取開始
位置にあるからディスクから反射光はリードイン部又は
既記録部分に記録された情報に従い強弱変化が生じる。
光検出器（17）（18）の出力はこの強弱変化に従って変
化するので、各光検出器（17）（18）の出力を加算する
ことにより再生HF信号が得られる（出力変化の大きい一
方の光検出器を利用してもよい）。That is, the change-over switches (19) (20) are controlled to the a side, and the outputs of the photodetectors (17) (18) are applied only to the adder (21). Since the pickup (26) is at the reading start position, the intensity of the reflected light from the disc changes according to the information recorded in the lead-in portion or the recorded portion.
Since the outputs of the photodetectors (17) and (18) change according to this strength change, a reproduction HF signal can be obtained by adding the outputs of the photodetectors (17) and (18) A photo detector may be used).

この再生HF信号をデコーダ（23）によりデコードして、
コントロール回路（24）に供給する。コントロール回路
（24）では、読取られた情報信号に従って、装置を制御
することになる。まずサブコードＱチャンネルのアドレ
ス４ビットが前述の様に（1000）の場合、光磁気ディス
クであると判別され、切換スイッチ（19）（20）がｂ側
を選択する様に制御される。This reproduced HF signal is decoded by the decoder (23),
Supply to the control circuit (24). The control circuit (24) controls the device according to the read information signal. First, when the address 4 bits of the subcode Q channel is (1000) as described above, it is determined to be a magneto-optical disk, and the changeover switches (19) and (20) are controlled so as to select the b side.

さらに、光磁気ディスクである場合には、記録再生に関
する情報が読取られ、この情報に応じて半導体レーザ
（10）、バイアス磁界発生手段（25）、ディスクを回転
せしめるためのスピンドルモータがコントロール回路に
より制御される。Further, in the case of a magneto-optical disk, information relating to recording / reproduction is read, and the semiconductor laser (10), the bias magnetic field generating means (25), and the spindle motor for rotating the disk are controlled by the control circuit according to this information. Controlled.

つまり、既記録部分（７）から情報を読取っている期間
中は、切換スイッチ（19）（20）がａ側を選択していな
ければならない。そこで、既記録部分（７）の終りの部
分に特定パターンが記録されている媒体では、この特定
パターンを検出することにより、切換スイッチ（19）
（20）をｂ側に切換えれば良い。そして、同時に、ピッ
クアップ（26）の位置を示すカウンタの値をクリアす
る。光磁気記録部分（３）の開始部分までの時間等に関
するデータが記録されている場合には、このデータを読
取って、所定時間経過後、ｂ側に切換える様にすればよ
い。以上の動作はコントロール回路（24）（マイクロコ
ンピュータ等で構成される）によって容易に実現され
る。That is, while the information is being read from the recorded portion (7), the changeover switches (19) and (20) must select the a side. Therefore, in a medium in which a specific pattern is recorded at the end of the recorded portion (7), the changeover switch (19) is detected by detecting this specific pattern.
Switch (20) to the b side. At the same time, the value of the counter indicating the position of the pickup (26) is cleared. If data relating to the time up to the start of the magneto-optical recording portion (3) is recorded, this data may be read, and after a lapse of a predetermined time, it may be switched to the b side. The above operation is easily realized by the control circuit (24) (composed of a microcomputer or the like).

情報記録再生装置に光磁気ディスクが装着されると、ま
ず、上記の判別が行なわれる。そして、再生動作を指定
すると、半導体レーザ（10）にコントロール回路（24）
の制御により所定のパワーが供給される。半導体レーザ
（10）からの光はコリメータレンズにより平行光線とさ
れ、第１の偏光ビームスプリッタ（12）によって、Ｓ偏
光成分が反射することにより、直線偏光（Ｐ偏光成分）
の光になる。When the magneto-optical disk is mounted on the information recording / reproducing apparatus, the above determination is first performed. When the playback operation is specified, the semiconductor laser (10) is controlled by the control circuit (24).
A predetermined power is supplied under the control of. The light from the semiconductor laser (10) is collimated by the collimator lens, and the first polarization beam splitter (12) reflects the S-polarized light component to produce linearly polarized light (P-polarized light component).
Become the light of.

この直線偏光の光が対物レンズ（13）により集光され、
光磁気ディスク（14）の光磁気記録部分に照射され、記
録された情報に従って反射光の偏光面が回転する。この
反射光は、Ｐ偏光成分が±0.3度程度、変化したもので
ある（すなわち、Ｓ偏光成分が発生している）。再び、
第１偏光ビームスプリッタ（12）に入射することによ
り、Ｐ偏光成分は30％程度反射し、Ｓ偏光成分が100％
反射することにより、回転角の変化が拡大される。This linearly polarized light is collected by the objective lens (13),
The polarization plane of the reflected light is irradiated according to the information recorded on the magneto-optical recording portion of the magneto-optical disk (14). In this reflected light, the P-polarized component is changed by about ± 0.3 degrees (that is, the S-polarized component is generated). again,
By entering the first polarization beam splitter (12), about 30% of the P-polarized component is reflected and 100% of the S-polarized component is reflected.
The change in the rotation angle is magnified by the reflection.

回転角の変化が拡大された反射光は1/2波長板（15）で
偏光面が回転され、そして第２偏光ビームスプリッタ
（16）によって、Ｐ偏光成分とＳ偏光成分に分離され
て、夫々対応する光検出器（17）（18）に入射される。
そしてこの光検出器（17）（18）の出力が差動増幅器
（22）に供給されることにより、光磁気の再生HF信号が
得られる。The plane of polarization of the reflected light whose rotation angle has been expanded is rotated by the half-wave plate (15), and is separated into the P-polarized component and the S-polarized component by the second polarization beam splitter (16), respectively. It is incident on the corresponding photodetector (17) (18).
Then, the outputs of the photodetectors (17) and (18) are supplied to the differential amplifier (22) to obtain a reproduced magneto-optical HF signal.

一方、光磁気ディスク装着後、記録又は消去動作が指定
されると、そのモードに応じたレーザパワー、磁界の強
さ、方向、ディスク回転制御の状態が、読取った情報に
基づいて、コントロール回路により設定される。又、光
磁気記録部分の開始位置が、設定され、以後のアクセス
に利用される。そして、記録、消去動作が行なわれる。On the other hand, when a recording or erasing operation is specified after mounting the magneto-optical disk, the laser power, magnetic field strength, direction, and disk rotation control status according to the mode are controlled by the control circuit based on the read information. Is set. Also, the start position of the magneto-optical recording portion is set and used for subsequent access. Then, recording and erasing operations are performed.

サブコードＱチャンネルのアドレス４ビットに（1000）
が記録されていない場合にはコンパクトディスクが装着
されていると判断され、切換スイッチ（19）（20）はａ
側を選択したままであり、コンパクトディスクのHF信号
が加算器（21）より得られる。Subcode Q channel address 4 bits (1000)
If is not recorded, it is determined that a compact disc is installed, and the changeover switches (19) and (20) are set to a.
The side is still selected and the compact disc HF signal is obtained from the adder (21).

尚、情報記録再生装置の構成は、第５図の如く構成する
こともできる。The information recording / reproducing apparatus may be configured as shown in FIG.

（ト）発明の効果 以上述べた様に、本発明によれば、記録レーザパワー条
件に関する情報を含む凹凸列が内周側に形成される為、
記録再生トラックが寸断されることもなく、記録の制限
を受けない。また、ピット列の再生位置を検出する為の
マークや回転検出手段も不要となる。(G) Effect of the Invention As described above, according to the present invention, since the concavo-convex row including the information regarding the recording laser power condition is formed on the inner peripheral side,
The recording / reproducing track is not fragmented, and recording is not restricted. Further, a mark for detecting the reproduction position of the pit string and a rotation detecting means are unnecessary.

更に、凹凸列を記録再生用のピックアップで再生できる
為、新たな検出手段が必要なくなる。Further, since the concave-convex line can be reproduced by the recording / reproducing pickup, no new detecting means is required.

また更に、凹凸列が記録再生トラックに先行する為、記
録開始の助走期間に記録レーザパワー条件を検出できピ
ックアップの余分な動作を必要としない等の効果があ
る。Furthermore, since the concave-convex row precedes the recording / reproducing track, there is an effect that the recording laser power condition can be detected in the run-up period of the recording start and an extra operation of the pickup is not required.

【図面の簡単な説明】[Brief description of drawings]

第１図は情報記録媒体の平面図、第２図は情報の記録さ
れるフォーマットを示す図、第３図、第５図は情報記録
再生装置のブロック図、第４図は情報記録媒体の斜視図
である。 （１）……光磁気ディスク （３）……光磁気記録部分、（７）……既記録部分FIG. 1 is a plan view of an information recording medium, FIG. 2 is a diagram showing a format in which information is recorded, FIGS. 3 and 5 are block diagrams of an information recording / reproducing apparatus, and FIG. 4 is a perspective view of the information recording medium. It is a figure. (1) ...... Magneto-optical disk (3) ...... Magneto-optical recording part, (7) ...... Pre-recorded part

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−55526（ＪＰ，Ａ) 特開 昭58−105427（ＪＰ，Ａ) 特開 昭59−165254（ＪＰ，Ａ) 特開 昭59−77648（ＪＰ，Ａ) 実開 昭58−97785（ＪＰ，Ｕ) ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-60-55526 (JP, A) JP-A-58-105427 (JP, A) JP-A-59-165254 (JP, A) JP-A-59- 77648 (JP, A) Actual development Sho 58-97785 (JP, U)

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】記録再生ピックアップにて再生可能な記録
再生トラック形成用のガイドと、前記記録再生ピックア
ップにて再生可能な再生専用トラックを構成する凹凸列
とを、プラスチック製のディスク基板の表面に成型し、
該ディスク基板上に再記録可能な磁性膜を形成する光磁
気ディスクに於て、 前記凹凸列は、記録レーザパワーの条件に関する情報を
含み、前記記録再生トラックに先行するディスク内周側
に、成型されることを特徴とする光磁気ディスク。1. A guide for forming a recording / reproducing track reproducible by a recording / reproducing pickup and a concavo-convex row forming a reproduction-only track reproducible by the recording / reproducing pickup are formed on the surface of a plastic disk substrate. Molded,
In a magneto-optical disk in which a re-recordable magnetic film is formed on the disk substrate, the concavo-convex row contains information on a condition of recording laser power, and is formed on the inner peripheral side of the disk preceding the recording / reproducing track. A magneto-optical disk characterized by being processed. 【請求項２】記録再生トラック形成用のガイドと、該ガ
イドに先行するディスク内周側に記録レーザパワー条件
に関する情報を含む再生専用トラックを構成する凹凸列
とを、プラスチック製のディスク基板の表面に成型し、
該ディスク基板上に再記録可能な磁性膜を形成する光磁
気ディスクに情報を記録する記録装置に於いて、 記録動作開始前に、前記再生専用トラックを記録再生ピ
ックアップにて光学再生して前記記録レーザパワーの条
件を検出し、検出した前記条件に基づき前記記録再生ピ
ックアップの記録レーザパワーを設定する制御手段を設
けたことを特徴とする記録装置。2. A surface of a plastic disk substrate, which includes a guide for forming a recording / reproducing track, and a concave-convex array forming a reproduction-only track containing information on a recording laser power condition on the inner peripheral side of the disk preceding the guide. Molded into
In a recording device for recording information on a magneto-optical disc having a re-recordable magnetic film formed on the disc substrate, before the recording operation is started, the reproduction-only track is optically reproduced by a recording / reproducing pickup to perform the recording. A recording apparatus comprising a control means for detecting a laser power condition and setting the recording laser power of the recording / reproducing pickup based on the detected condition.
JP60084822A 1985-04-19 1985-04-19 Magneto-optical disk and its recording device Expired - Lifetime JPH0756708B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60084822A JPH0756708B2 (en) 1985-04-19 1985-04-19 Magneto-optical disk and its recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60084822A JPH0756708B2 (en) 1985-04-19 1985-04-19 Magneto-optical disk and its recording device

Related Child Applications (5)

Application Number Title Priority Date Filing Date
JP4326682A Division JPH06325409A (en) 1992-12-07 1992-12-07 Disk and disk recorder
JP4326684A Division JP2721841B2 (en) 1992-12-07 1992-12-07 Optical disk and optical disk playback device
JP4326683A Division JP2698303B2 (en) 1992-12-07 1992-12-07 Recordable disk and disk recording device
JP8122791A Division JP3071143B2 (en) 1996-04-22 1996-04-22 Disc manufacturing method
JP12278296A Division JP2726033B2 (en) 1996-04-22 1996-04-22 Information recording / reproducing device

Publications (2)

Publication Number Publication Date
JPS61243974A JPS61243974A (en) 1986-10-30
JPH0756708B2 true JPH0756708B2 (en) 1995-06-14

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Country Link
JP (1) JPH0756708B2 (en)

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