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

Magneto-optical disk and its recording device

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Publication number
JPH0756708B2
JPH0756708B2 JP8482285A JP8482285A JPH0756708B2 JP H0756708 B2 JPH0756708 B2 JP H0756708B2 JP 8482285 A JP8482285 A JP 8482285A JP 8482285 A JP8482285 A JP 8482285A JP H0756708 B2 JPH0756708 B2 JP H0756708B2
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recording
magneto
laser power
reproduction
information
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JPS61243974A (en )
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重和 峯近
研示 虎沢
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三洋電機株式会社
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00Recording 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
    • G11B11/10Recording 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
    • G11B11/105Recording 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 thermo-magnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00Recording 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
    • G11B11/10Recording 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
    • G11B11/105Recording 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 thermo-magnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582Record carriers characterised by the selection of the material or by the structure or form
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00Driving, 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
    • G11B19/02Control of operating function, e.g. switching from recording to reproducing
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00Record 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
    • G11B23/30Record 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28Indexing; 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
    • G11B27/30Indexing; 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
    • G11B27/3027Indexing; 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
    • G11B27/3063Subcodes
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/20Disc-shaped record carriers
    • G11B2220/25Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2525Magneto-optical [MO] discs
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/20Disc-shaped record carriers
    • G11B2220/25Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537Optical discs
    • G11B2220/2545CDs

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。 DETAILED DESCRIPTION OF THE INVENTION (i) industrial FIELD The present invention is a magneto-optical disk obtained by forming a recording laser power information as a reproduction-only track, about the recording apparatus.

(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) a test area provided for performing recording with the optimum laser power with respect to the prior art optical disk, the technique for determining the optimum laser power by evaluating the results of the recording and reproducing in the test area, especially It disclosed in JP HirakiAkira 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 prior art, in order to set the optimum laser power, not only requires a tedious evaluation work, including the recording and reproduction, not only must be provided with evaluation means to all of the recording apparatus, the recording laser power there is a risk that damage the recording film in the case the test area increases.

そこで、同一記録材料で同一構成の光磁気ディスクは、 Therefore, the magneto-optical disk having the same configuration in the same recording material,
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。 Considering that the optimum laser power is also common, by recording laser power determined depending on the composition and structure of the recording material of the magneto-optical disc in a part of the magneto-optical disc, it is possible to omit the evaluation time and evaluation means 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。 The JP 58-105427 discloses, but not the magneto-optical disc, recording materials with respect to the different types of magnetic recording medium, the projections on a part of the magnetic recording medium as it is recorded with the optimum recording condition forming a, there has been proposed a circuit which sets the magnetic recording condition the protrusion is mechanically detected.

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, the conventional example described above, the mechanical means of detection for condition detection is separately required.

(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) SUMMARY OF THE INVENTION Accordingly, the recording laser power condition so as not be an obstacle to the recording track formed a magneto-optical disk, natural without recorded recording laser power condition is added separately detecting means a magneto-optical disk can be quickly detected, it is necessary to provide the recording apparatus.

(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。 Therefore means for solving (D) object, the present invention relates to a recording and guide for reproducing tracks formed playable in the recording and reproducing pickup, irregularities columns that make up the reproduction-only track can be reproduced by said recording and reproducing pickup preparative, molded into the surface of the plastic disc substrate, a rewritable magnetic layer on the disk substrate at a magneto-optical disk to form, the uneven rows includes information on conditions of recording laser power, wherein the recording disc inner circumference side preceding the read track, is to propose a magneto-optical disk to be molded.

更に、本発明は、記録再生トラック形成用のガイドと、 Furthermore, the present invention includes a guide for recording tracks formed,
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。 And irregularities example of configuring a reproduction-only track that contains information about the recording laser power condition in a disk circumferential side preceding the guide, molded into the surface of the plastic disc substrate, re-recordable magnetic on the disk substrate in the recording apparatus for recording information on a magneto-optical disk to form a film, before the start of the recording operation, the reproduction-only track optically reproduced by a reproducing pickup detects the condition of the recording laser power was detected It proposes a recording apparatus for setting a recording laser power of the recording and reproducing pickup based on the condition.

(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) acts Therefore, according to the present invention, the recording laser power in the recording and reproducing track is set by reproducing an uneven row of the recording medium by the pickup for recording and reproduction.

(ヘ)実施例 以下、図面に従い本発明の実施例を説明する。 (F) Example Hereinafter, a description will be given of an embodiment of the present invention in accordance with the accompanying drawings. 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。 Plan view of FIG. 1 is an information recording medium, Figure 4 is a perspective view, FIG. 2 recording, shows a format to be recorded in the information about the conditions of reproduction, FIG. 3 is FIG. 5, the present invention it is a block diagram of the usage information recording and reproducing apparatus of the information recording medium.

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。 In Figure 1, (1) is a magneto-optical disc (information recording medium). 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。 And holes (2) is provided in the central portion, the through hole (2) is Kuranbu by the information recording and reproducing apparatus, the disc (1) is rotated. (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。 (3) is a magneto-optical recording portion, the structure of which becomes as shown in Figure 4.
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。 That is, the guide groove (4a) a plastic substrate formed of (this portion is the recording and reproducing track) (polycarbonate, acryl) to (4) GdTbFe, (indicated by hatching) perpendicular magnetization film (5), such as TbFeCo is deposited or it is provided by sputtering. 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。 And this is on the vertical magnetization film (5) is formed a protective layer of a dielectric (6).

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。 Inside the magneto-optical recording portion (3) is recorded, already the information signal on a condition of reproduction is recorded the recording portion (7) is provided. 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。 Method of recording information signals to the already-recorded portion (7), as a compact disc player, a method for recording a pit (8) unevenness of on the plastic substrate (4) are 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。 If more recording method, the change in the amount of reflected light from the disk (1), can already be read recorded information signals. 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。 Method of recording in the form of irregularities of the pits, when the guide groove (4a) formed, it is possible to create a pit, and is advantageous because there is no risk of being erased. 尚、 still,
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。 The laser beam is irradiated as an arrow A from a plastic substrate (4) side.

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。 Recording, as the format to be recorded in the information relating to the reproduction conditions, in a compact disc can be utilized devices utilize the format of the subcode Q-channel of the compact disc. 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。 The format of the subcode Q-channel are those shown in Figure 2. このうち、アドレスの4ビットにおいて、(0001),(0010),(001 Among them, the 4-bit address, (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。 1) is a pattern of important implications for compact discs, no meaning for other patterns compact disc.

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, the already-recorded portion (7) of the magneto-optical disk (1) is recording the pattern of the address part of the format of the subcode Q-channel example (1000).

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。 And the data part of 72 bits, (including erasing) recording of the magneto-optical disk, information about the condition of reproduction is recorded. 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。 And this information, for example, during recording, erasing, reproduction laser power, linear velocity, to a strength and direction of the bias magnetic field. 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。 It is also possible to allowed to instruct the start (or end of the recorded portion (7)) of the magneto-optical recording portion to record specific pattern (3). 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。 That, or a mark indicating reference position specific pattern, rotational speed up to the start of the magneto-optical recording portion, the time of data recording.

記録、再生に関する条件が必要なのは、次の理由による。 Record, conditions of need relating to the reproduction is due to the following reasons. 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。 That is, as the material of the perpendicular magnetic film of the magneto-optical disk, GdFe as described above, TbFe, there are such TbFeCo, Different compositions, laser power, to conditions of the bias magnetic field will come naturally different, and basic TbFeCo laser power of recording and erasing because the Curie point is increased if an increase is the percentage of Co in the material to be because it is necessary to increase.

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, recording, erasing, reproduction laser power, recording, if write the strength or required linear velocity of the bias magnetic field at the time of erasing a recorded portion (7), in the information recording and reproducing apparatus, the recording material It can correspond to different optical disk.

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。 Moreover, even in the recording material is the same, the magnetization direction of the magneto-optical recording portion in the no recording state, since it is conceivable vary by standard, during recording, the information specifying the orientation of the bias magnetic field during erase recording is is it 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。 Then, based on Figure 3, it will be described an information recording and reproducing apparatus using the disc.

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。 The semiconductor laser in FIG. 3 (10) is a laser light source, (11) a collimator lens (12) the first polarizing beam splitter (13) is an objective lens, (14) a disk (15) half-wave plate, (16) is a polarization beam splitter, (17) (18) is an optical detector, (19) (20) change-over switch for switching the output of the photodetector (17) (18), (21 ) adder (non differential read circuit), (22) is a differential amplifier (differential read circuit), (23) the decoder (24) is a control circuit. 又、(25)はバイアス磁界の付与手段である。 Further, (25) is providing means of the bias magnetic field.

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 mounting the disc (information recording medium), two possible since resistance may, the information recording and reproducing apparatus reads the state of the lead-in portion of the recorded portion or a compact disc of the magneto-optical disk of this disc magneto-optical disc and a compact disc to become.

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。 That is, the selector switches (19) (20) is controlled to a side, the output of the photodetector (17) (18) is applied only to the adder (21). 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。 Then, the pickup (26), light reflected from the disk because there the reading start position intensity changes occur in accordance with information recorded in the lead-in portion or a recorded portion.
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)。 Since the output of the photodetector (17) (18) changes in accordance with the intensity changes, each photodetector (17) (18) output reproduced HF signal by adding obtain the (output variation larger one of it may be used an optical detector).

この再生HF信号をデコーダ(23)によりデコードして、 The reproduction HF signal is decoded by the decoder (23),
コントロール回路(24)に供給する。 It is supplied to the control circuit (24). 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。 The control circuit (24), in accordance with the read The information signal will control the device. 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。 If first of the address 4 bits of the subcode Q channel is as described above (1000), is determined that the magneto-optical disc, the change-over switch (19) (20) is controlled so as to select a 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。 Furthermore, in the case of magneto-optical disk, information is read to a recording reproducing, the semiconductor laser in accordance with the information (10), a bias magnetic field generating means (25), the spindle motor control circuit for allowing rotation of the disk It is 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。 That is, during a period in which reading the information from a recorded portion (7), the change-over switch (19) (20) must select a side. 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) Therefore, in the medium in which the specific pattern is recorded at the end portion of the recorded portion (7), by detecting this particular pattern, the change-over switch (19)
(20)をb側に切換えれば良い。 (20) may be switched to the b side. 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。 At the same time, it clears the value of the counter indicating the position of the pickup (26). 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。 If the time-related data such as to the start portion of the magneto-optical recording portion (3) is recorded, it reads the data, after a predetermined time, it is sufficient so as to switch on the b side. 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。 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。 When the magneto-optical disc to the information recording and reproducing apparatus is mounted, firstly, the above determination is performed. 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) When specifying a playback operation, the control circuit to the semiconductor laser (10) (24)
の制御により所定のパワーが供給される。 Predetermined power is supplied under the control of. 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) Light from the semiconductor laser (10) is collimated by the collimator lens, the first polarizing beam splitter (12), by reflecting the S-polarized light component, the linearly polarized light (P-polarized light component)
の光になる。 Become of light.

この直線偏光の光が対物レンズ(13)により集光され、 Light in the linearly polarized light is condensed by the objective lens (13),
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。 Is irradiated on the magneto-optical recording portion of the magneto-optical disk (14), the plane of polarization of the reflected light is rotated according to the recorded information. 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)。 The reflected light is to P-polarized light component is about 0.3 ° ±, has changed (i.e., S-polarized light component is generated). 再び、 again,
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% By entering the first polarizing beam splitter (12), P-polarized light component is reflected approximately 30%, S-polarized light component 100%
反射することにより、回転角の変化が拡大される。 By reflecting the change of the rotation angle is enlarged.

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。 Reflected light change is magnified rotational angle polarization plane is rotated by half-wave plate (15), and by the second polarization beam splitter (16), is separated into P and S polarization components, respectively It is incident on the corresponding photodetector (17) (18).
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。 Then, by the output of the light detector (17) (18) is supplied to the differential amplifier (22), reproduction HF signal of the magneto-optical is obtained.

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。 On the other hand, after the optical disk mounted, the recording or erasing operation is designated, the laser power corresponding to that mode, the magnetic field strength, direction, status of the disk rotation control, based on the read information, a control circuit It is set. 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。 Moreover, the start position of the magneto-optical recording portion, is set, is used for subsequent accesses. そして、記録、消去動作が行なわれる。 Then, recording, erasing operation is performed.

サブコードQチャンネルのアドレス4ビットに(1000) To address 4 bits of the subcode Q-channel (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 There compact disk is discriminated as being correctly mounted when not recorded, the change-over switch (19) (20) is 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。 Remains selected side, HF signal of a compact disc 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 configuration of the information recording and reproducing apparatus can also be configured as Figure 5.

(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、 (G) As mentioned effects above, according to the present invention, since the uneven columns containing information relating to the recording laser power condition is formed on the inner peripheral side,
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。 Without even recording track is fragmented, not restricted recording. 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。 In addition, mark and rotation detection means for detecting the playback position of the pit row is also 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。 Furthermore, since that can play an uneven row pickup for recording and reproduction, 100 requires no new detection means.

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 unevenness column precedes the recording track, there is an effect such that does not require extra operation of the pickup can detect the recording laser power condition in running period of the start of recording.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE 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。 Plan view of FIG. 1 is an information recording medium, FIG. FIG. 2 showing a format to be recorded in the information, Figure 3, a block diagram of Fig. 5 the information recording and reproducing apparatus, perspective of FIG. 4 is an information recording medium it is a diagram. (1)……光磁気ディスク (3)……光磁気記録部分、(7)……既記録部分 (1) ... magneto-optical disc (3) ...... magneto-optical recording portion, (7) ... a recorded portion

───────────────────────────────────────────────────── 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) ────────────────────────────────────────────────── ─── of the front page continued (56) reference Patent Sho 60-55526 (JP, a) JP Akira 58-105427 (JP, a) JP Akira 59-165254 (JP, a) JP Akira 59- 77648 (JP, A) JitsuHiraku Akira 58-97785 (JP, U)

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【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、 And 1. A guide for recording and reproducing track formed playable in the recording and reproducing pickup, and uneven rows constituting the reproduction-only track can be reproduced by said recording and reproducing pickup, on the surface of the plastic disc substrate molded,
    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。 At a magneto-optical disk to form a re-recordable magnetic film on the disk substrate, the uneven rows includes information on conditions of recording laser power, the inner periphery side disc preceding the recording track, molding magneto-optical disk, characterized in that it is.
  2. 【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、 2. A recording and guide for reproducing tracks formed, and uneven rows constituting the reproduction-only track that contains information about the recording laser power condition in a disk circumferential side preceding the guide, the surface of the plastic disc substrate molded into,
    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。 In the recording apparatus for recording information on a magneto-optical disk to form a re-recordable magnetic film on the disk substrate, before the start of the recording operation, the recording and optical reproduction by the recording and reproducing pickup the reproduction-only track detecting a condition of the laser power, the recording apparatus characterized in that a control means for setting a recording laser power of the recording and reproducing pickup based on the detected condition.
JP8482285A 1985-04-19 1985-04-19 Magneto-optical disk and its recording device Expired - Lifetime JPH0756708B2 (en)

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JP8482285A JPH0756708B2 (en) 1985-04-19 1985-04-19 Magneto-optical disk and its recording device

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JPH0756708B2 true JPH0756708B2 (en) 1995-06-14

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NL8800170A (en) * 1988-01-26 1989-08-16 Philips Nv An optically readable record carrier of the inscribable type, and optical read device for reading such a record carrier.
JP2573281B2 (en) * 1988-02-05 1997-01-22 株式会社東芝 Method for regenerating a magneto-optical disk
JP2847722B2 (en) * 1988-06-24 1999-01-20 ソニー株式会社 Magneto-optical recording device
JPH0273525A (en) * 1988-09-08 1990-03-13 Matsushita Electric Ind Co Ltd Optical reproducing device and recording medium
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JPH03116539A (en) * 1989-09-29 1991-05-17 Toshiba Corp Disk device
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