JPS6113458A - Optical information recording medium and cutting device - Google Patents
Optical information recording medium and cutting deviceInfo
- Publication number
- JPS6113458A JPS6113458A JP59133156A JP13315684A JPS6113458A JP S6113458 A JPS6113458 A JP S6113458A JP 59133156 A JP59133156 A JP 59133156A JP 13315684 A JP13315684 A JP 13315684A JP S6113458 A JPS6113458 A JP S6113458A
- Authority
- JP
- Japan
- Prior art keywords
- light
- item
- laser beam
- recording medium
- cutting device
- 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
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
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
- G11B13/04—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
- G11B13/04—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties
- G11B13/045—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties combined recording by magnetic and optic means
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00745—Sectoring or header formats within a track
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0938—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following servo format, e.g. guide tracks, pilot signals
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、光デイスクファイル装置等の光学的情報記憶
装置の情報記録媒体およびそれを作製するカッティング
装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an information recording medium for an optical information storage device such as an optical disk file device and a cutting device for producing the same.
従来、光デイスクファイル装置用の光ディスクには、照
射光を光学的に案内するためのトラック案内溝があらか
じめ形成され、この案内溝に沿って照射光を走査して溝
の中に情報を記録していた。Conventionally, an optical disk for an optical disk file device has a track guide groove formed in advance for optically guiding the irradiated light, and the irradiated light is scanned along the guide groove to record information in the groove. was.
また、トラックの一周はいくつかのセクターに分割され
ていて、各セクタの先頭には、トラックアドレス、セク
ターアドレス等のヘッダー信号が、溝の中に、凹凸のピ
ットの形であらかじめ形成されており、セクター単位の
検索が可能になっている（例えば１日経エレクトロニク
ス、１９８３年。Also, one track is divided into several sectors, and at the beginning of each sector, header signals such as track address and sector address are pre-formed in the form of uneven pits in the groove. , it is now possible to search by sector (for example, 1 Nikkei Electronics, 1983).
１１月２１日号、１９７頁）。(November 21 issue, p. 197).
従来の追加記録型光ディスクにおいては、溝の中に情報
を記録しても、信号対雑音比（Ｓ／Ｎ）は、読み取り誤
りを起こさない条件を満足する程、充分な値が確保でき
た。ところが、情報の書き換えが可能な光ディスクに、
この方式を採用すると、Ｓ／Ｎが小さく、エラー率を低
くする条件を満たさないという問題が生じる。特に、垂
直磁化膜を記録媒体とする光磁気ディスクにおいては、
磁化による１度以下の偏光面回転を検出して情報を再生
するので、Ｓ／Ｎを高めることが、重要な技術課題とな
っている。In conventional optical discs of additional recording type, even when information is recorded in the grooves, the signal-to-noise ratio (S/N) can be maintained at a value sufficient to satisfy the condition that reading errors do not occur. However, optical discs with rewritable information
If this method is adopted, a problem arises in that the S/N is small and the conditions for lowering the error rate are not satisfied. In particular, in magneto-optical disks that use a perpendicularly magnetized film as a recording medium,
Since information is reproduced by detecting polarization plane rotation of 1 degree or less due to magnetization, increasing the S/N ratio is an important technical issue.
本発明の目的は、表面雑音レベルが低く、高いレベルの
再生信号を得ることのできる情報記録媒体およびそれを
作製するためのカッティング装置を提供することにある
。An object of the present invention is to provide an information recording medium that has a low surface noise level and can obtain a high-level reproduction signal, and a cutting device for producing the same.
本発明の情報記録媒体は、隣接する案内溝間に溝番地や
セクター番号の情報を持った凹凸ピット状のヘッダーを
あらかじめ形成したことを特徴とし案内溝間の平坦部に
情報を記録することによって、媒体表面雑音を下げ、Ｓ
／Ｎ比の向上を達成するものである。The information recording medium of the present invention is characterized in that an uneven pit-shaped header having information such as a groove address and a sector number is formed in advance between adjacent guide grooves. , reduce media surface noise, S
/N ratio is achieved.
また、このような記録媒体作製用原盤を作るために、本
発明では、カッティング装置の露光用レンズに、ヘッダ
ーピット形成用レーザビームと、案内溝形成用ビームを
同時に入れ、それぞれのレーザビームを独立に変調する
。In addition, in order to make such a master disk for producing a recording medium, in the present invention, a laser beam for forming header pits and a beam for forming guide grooves are simultaneously input into the exposure lens of the cutting device, and each laser beam is independently controlled. modulates to.
以下、本発明の実施例を図面により説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図は、本発明の情報記録媒体である光ディスクの記
録膜の一部を拡大して示したものである。FIG. 1 is an enlarged view of a part of the recording film of an optical disc, which is an information recording medium of the present invention.
この記録膜は、透明な基板上に設けられ、更に記録膜上
には保護膜が形成される。照射光は、基板を介して記録
膜に照射される。光磁気ディスクを例にとれば、この記
録膜は垂直磁化膜であり、情報は磁化の上・下向きの違
いとして記録される。This recording film is provided on a transparent substrate, and a protective film is further formed on the recording film. The irradiation light is irradiated onto the recording film through the substrate. Taking a magneto-optical disk as an example, this recording film is a perpendicularly magnetized film, and information is recorded as the difference between upward and downward magnetization.
λ／８（λは再生レーザ光の波長）深さの案内溝１の上
の記録膜表面は、溝間の平坦部と比べて、微細な凹凸が
多く表面雑音レベルが高い。これは、ディスク原盤作製
時における溝カッティング用レーザ光の光強度ゆらぎや
、フォトレジスト現象のゆらぎ等に関係していると考え
られる６本発明では、Ｓ／Ｎを向上させるために、溝間
に情報を記録し、媒体表面雑音を低いレベルに押さえる
。発明者等の実験によれば、３ｄＢのＳ／Ｎ向上が得ら
れた。The surface of the recording film above the guide groove 1 having a depth of λ/8 (λ is the wavelength of the reproduction laser beam) has many fine irregularities and has a high surface noise level compared to the flat area between the grooves. This is thought to be related to the optical intensity fluctuation of the laser beam for groove cutting during the production of the master disk, the fluctuation of the photoresist phenomenon, etc. 6 In the present invention, in order to improve the S/N, the grooves are Record information and keep media surface noise to a low level. According to experiments conducted by the inventors, an S/N improvement of 3 dB was obtained.
第２図は、従来の光ディスクで用いられた記録方式であ
り、案内溝の中に情報を記録し、ヘッダー信号である凹
凸ピットは、あらかじめ溝の中に形成されていた６本発
明では、第１図に示すように、ヘッダー信号へピットは
、あらかじめ溝間に形成しておく。こうす・ることによ
って、再生光ビームは、ヘッダー信号に引き続いて、磁
化ドメインに対応する記録情報を再生することができる
。Figure 2 shows a recording method used in a conventional optical disc, in which information is recorded in a guide groove, and uneven pits, which are header signals, are formed in advance in the grooves. As shown in FIG. 1, pits for the header signal are formed in advance between the grooves. By doing this, the reproduction light beam can reproduce the recorded information corresponding to the magnetized domain following the header signal.
一方、再生光スポットの拡がりは、２つの溝にまたがっ
ているので、その中心が溝の中間にあっても、トラック
ずれ信号は、充分にとれ、トラッキングが可能である。On the other hand, since the reproduction light spot spreads across the two grooves, even if its center is in the middle of the grooves, a sufficient track deviation signal can be obtained and tracking is possible.
次に、本発明の情報記録媒体を作製するための原盤カッ
ティング装置につき説明する。Next, a master cutting apparatus for producing the information recording medium of the present invention will be explained.
第３図は、本発明に係るカッティング装置の一実施例を
示す図である。アルゴンレーザ１１から出た直線偏光を
持ったレーザビームは変調器１２に入射し、フォトレジ
ストの塗布されたガラス円板２３のレーザビーム入射点
の半径に比例するように強度は変調される。ついでレー
ザビームはビームスプリッタ−１３により２分され、一
方は光変調器１７により、ヘッダ一部ピット形成信号に
応じてパルス状の光に変換され、更に１７２波長板２７
により、偏光面は９０’回転させられた直線偏光となり
、偏光ビームスプリッタ−１９に入射する。ここでは偏
光方向は紙面に平行となっている。ビームスプリッタ−
１３により２分されたもう一方の紙面に垂直な偏りを持
った光は反射鏡１４．１５で反射され偏光ビームスプリ
ッタ−１９に入射し、反射される。上記２本のレーザビ
ームは互にわずかに角度を持ち、１／４波長波２６を通
ったのち、互に逆方向に回転する円偏光となり、レンズ
２ｏで集光され、露光レンズ２２に入射し、ガラス円板
２３のフォトレジスト面に結像する６１／４波長波２６
は円板２３がらの反射光のレーザーへの入射防止のため
にある。ここで、１６．１８．２１は反射鏡である。ト
ラックピッチ１．６μｍの場合、ＮＡが０．９０の露光
レンズ２２を用いると、露光レンズ２２に入射する２本
のレーザビームのなす角度は、ヘッダ一部ピット２を案
内溝１のほぼ中央に位置させる場合、約０．０２度であ
り、この角度になるようにかつ２本のレーザビームが露
光レンズ２２の中心に入射するように反射鏡１４．１５
の傾きを調整する。FIG. 3 is a diagram showing an embodiment of the cutting device according to the present invention. A linearly polarized laser beam emitted from the argon laser 11 is incident on the modulator 12, and its intensity is modulated in proportion to the radius of the laser beam incident point on the glass disk 23 coated with photoresist. Next, the laser beam is split into two by a beam splitter 13, one of which is converted into pulsed light by an optical modulator 17 according to the header part pit formation signal, and further converted into pulsed light by a 172 wavelength plate 27.
As a result, the plane of polarization is rotated by 90' to become linearly polarized light, which enters the polarizing beam splitter 19. Here, the polarization direction is parallel to the plane of the paper. beam splitter
The other light polarized perpendicular to the plane of the paper divided into two by 13 is reflected by reflecting mirrors 14 and 15, enters a polarizing beam splitter 19, and is reflected. The two laser beams have a slight angle to each other, and after passing through the 1/4 wavelength wave 26, they become circularly polarized light rotating in opposite directions, are focused by the lens 2o, and enter the exposure lens 22. , a 61/4 wavelength wave 26 that is imaged on the photoresist surface of the glass disk 23
is provided to prevent the reflected light from the disk 23 from entering the laser. Here, 16, 18, and 21 are reflecting mirrors. In the case of a track pitch of 1.6 μm, if an exposure lens 22 with an NA of 0.90 is used, the angle formed by the two laser beams incident on the exposure lens 22 will be such that the header part pit 2 is placed approximately in the center of the guide groove 1. When positioned, the angle is about 0.02 degrees, and the reflecting mirrors 14 and 15 are set at this angle and so that the two laser beams are incident on the center of the exposure lens 22.
Adjust the tilt.
本実施例においては第４図に示すような、ヘッダ一部ピ
ット２の両側を含めて連続した案内溝１が得られる。In this embodiment, a continuous guide groove 1 including both sides of the header part pit 2 as shown in FIG. 4 is obtained.
像
第５図は本発明に祷る原盤カッティング装置の別の実施
例を示す図である。第３図と異なる点は一方のレーザビ
ームの光路上にも光変調器２４を設け、案内溝１の形状
を任意に断続することが可能となる。更に反射鏡１４．
１５のかわりにプリズム２５によりレーザビームに傾き
をつけている。FIG. 5 is a diagram showing another embodiment of the master cutting device according to the present invention. The difference from FIG. 3 is that an optical modulator 24 is also provided on the optical path of one of the laser beams, and the shape of the guide groove 1 can be arbitrarily interrupted. Furthermore, a reflecting mirror 14.
15, the laser beam is tilted by a prism 25.
露光レンズ２２に入射する角度およびレンズ２０の倍率
がわかっていれば、上記角度は一定であるからプリズム
２５の頂角を選ぶことにより、より簡易かつ安定な光路
の形成が可能となる。本実施例では第３図と異なり１／
４波長板２６は除いており、２本のレーザビームは互に
偏光面が直交する直線偏光となっている。露光レンズへ
の２本の。If the angle of incidence on the exposure lens 22 and the magnification of the lens 20 are known, since the above angles are constant, by selecting the apex angle of the prism 25, it becomes possible to form a more simple and stable optical path. In this example, unlike Fig. 3, 1/
The four-wavelength plate 26 is excluded, and the two laser beams are linearly polarized lights whose polarization planes are orthogonal to each other. Two to the exposure lens.
レーザビームの入射角を垂直からずらすことにより、レ
ーザ１１への反射光の戻りをなくすことが可能である。By shifting the incident angle of the laser beam from the vertical, it is possible to eliminate the return of reflected light to the laser 11.
第６図は、本発明のディスク媒体を用いた、光磁気ディ
スク記録再生消去装置の構成を示すものである。半導体
レーザ３１の出射光は、レンズ３２で平行光ビームにコ
リメートされ、さらに三角プリズム３３で、ビーム形を
円形断面に変換した後、ビームスプリッタ−３４を通過
し、ミラー３８で反射され、レンズ３５でディスク３０
の記録膜上に集光される。ディスクに対向して記録消去
用の磁場を発生する電磁コイル５０が設けられている。FIG. 6 shows the configuration of a magneto-optical disk recording/reproducing/erasing device using the disk medium of the present invention. The emitted light from the semiconductor laser 31 is collimated into a parallel light beam by a lens 32 , and further converted into a circular cross-section by a triangular prism 33 , passes through a beam splitter 34 , is reflected by a mirror 38 , and is then collimated into a parallel light beam by a triangular prism 33 . disk 30
The light is focused onto the recording film. An electromagnetic coil 50 is provided facing the disk and generating a magnetic field for recording and erasing.
ディスク３０からの反射光は、ビームスプリッタ−３４
でけり出され、さらに、ビームスプリッタ−３６でけり
出された光は、検光子３７を通って、ミラーで反射され
レンズを介して光検出器３９に導かれ、磁化情報とヘッ
ダー信号とが検出される。ビームスプリッタ−３６を通
過した光は、自動焦点や、トラッキング制御用の制御信
号検出光学系４０に導かれる。例えば、ビームスプリッ
タ−４１で、更に２分され、一方は球面レンズを介して
トラックずれ検出の２分割光検出器４２へ、他方は球面
レンズと円柱レンズからなる非点収差光学系を通し、ナ
イフェツジで一部遮へいされ、焦点ずれ検出の光検出器
４３へ導かれる。The reflected light from the disk 30 is transmitted to a beam splitter 34.
The light emitted by the beam splitter 36 passes through an analyzer 37, is reflected by a mirror, and is guided to a photodetector 39 via a lens, where magnetization information and header signals are detected. be done. The light passing through the beam splitter 36 is guided to a control signal detection optical system 40 for automatic focusing and tracking control. For example, the beam is further divided into two parts by a beam splitter 41, one is sent to a two-split photodetector 42 for detecting track deviation through a spherical lens, and the other is sent to a knife beam through an astigmatism optical system consisting of a spherical lens and a cylindrical lens. The light is partially shielded by the light beam and guided to a photodetector 43 for detecting defocus.
トラックずれ検出法や、焦点ずれ検出法は、既にいくつ
もの方法が提案されており、本発明のディスク媒体構造
に対して、方法を限定する必要はなく、いずれの方法も
適用できる。A number of methods for detecting track deviation and defocus detection have already been proposed, and there is no need to limit the methods to the disk medium structure of the present invention, and any of these methods can be applied.
ここでは、例として、ディスク３０にあらかじめ形成さ
れた直線的な案内溝ｌによる回折パターンが２分割光検
出器４２上で、トラックずれに伴なって移動することに
よって、トラックずれ検出する、いわゆるプッシュプル
法を用いた場合について説明しておく。従来は、案内溝
上を光スポットが通過しており、トラックピッチ１．６
μｍ、光スポツト直径約１．８μｍの場合、光スポット
の振幅分布は、両隣りのトラックにまで広がっているた
めに、２分割光検出器上には、０次回折光と１次回折光
との干渉パターンが現われる。トラックずれかない場合
には、この干渉パターンはトラックに対して対称である
が、トラックずれが生じると干渉パターンの対称性がく
ずれるので、２分割光藤用益の差出力が、０でなくなる
。この差出力をトラッキングアクチュエータに帰還して
、トラッキング制御を行なう。Here, as an example, a so-called push-pull method detects a track deviation by moving a diffraction pattern formed by a linear guide groove l previously formed on the disk 30 on the two-split photodetector 42 in accordance with the track deviation. The case where the pull method is used will be explained. Conventionally, a light spot passes on a guide groove, and the track pitch is 1.6.
μm, and when the optical spot diameter is approximately 1.8 μm, the amplitude distribution of the optical spot extends to adjacent tracks on both sides, so that interference between the 0th-order diffracted light and the 1st-order diffracted light appears on the two-split photodetector. A pattern emerges. If there is no track shift, this interference pattern is symmetrical with respect to the track, but if track shift occurs, the symmetry of the interference pattern is broken, so the difference output of the two-split Mitoufuji utility is no longer zero. This differential output is fed back to the tracking actuator to perform tracking control.
本発明の溝間ヘッダー付きディスクに対し、光スポット
を溝間に位置づけさせるためには、２分割光検出器４２
の差出力の極性を逆にして、トラッキングアクチュエー
タ例えば、ガルバノミラ−３８に帰還すればよい。すな
わち、光スポットが溝間にある場合、光スポットは２つ
の溝にまたがって広がっているために、２分割光検出器
４２上には、回折による干渉パターンが、同様に生じて
いる。ただし、トラックずれによる干渉パターンの対称
性のくずれは、溝上の場合と溝間の場合とでは、逆の強
度分布になるので、差出力の極性を逆にする必要がある
６ トラックピッチ１，６μｍ、光スポット径約１．８
μｍの場合にはトラックずれ検出感度は、溝中でも溝間
でもほとんど同じであり、トラッキング制御の安定性は
同様に確保できる。 “
なお、本発明は、書き換え可能な光ディスクの他の方式
である、結晶相と非晶質相とが可逆的に変化する記録材
料を用いた光ディスクにおいても、同様な効果がある。In order to position the light spot between the grooves of the disc with the groove header of the present invention, the two-split photodetector 42 is used.
The polarity of the differential output may be reversed and fed back to the tracking actuator, for example, the galvanomirror 38. That is, when the light spot is located between the grooves, since the light spot spreads across the two grooves, an interference pattern due to diffraction is similarly generated on the two-split photodetector 42. However, if the symmetry of the interference pattern is broken due to track misalignment, the intensity distribution will be opposite between the grooves and between the grooves, so the polarity of the differential output must be reversed.6 Track pitch: 1.6 μm , light spot diameter approximately 1.8
In the case of μm, the tracking deviation detection sensitivity is almost the same between grooves and between grooves, and the stability of tracking control can be similarly ensured. "The present invention has similar effects on optical discs using a recording material in which a crystalline phase and an amorphous phase change reversibly, which is another type of rewritable optical disc.
さらに、本発明は、光吸収による温度上昇で穴が形成さ
れる記録膜を用いた追記型光ディスクにおいても、Ｓ／
Ｎ向上の効果があるので、光ディスクの高密度記録化、
高速再生化にも有効である。Furthermore, the present invention also applies to write-once optical discs using recording films in which holes are formed due to temperature rise due to light absorption.
Since it has the effect of improving N, high-density recording of optical discs,
It is also effective for high-speed playback.
溝間に情報を記録する方式については、既出願の発明が
いくつかあるが１本発明とは以下のように異なる。Regarding the method of recording information between the grooves, there are several inventions that have already been filed, but one differs from the present invention as follows.
特開昭５４−１３０１０３号では１周期的構造をもつサ
ーボトラック２本の間に、情報を記録して、ジッターを
補正する方法が提案されている。光スポットは、記録用
とサーボトラック読み出し用の２つが必要である。本発
明では、案内溝には周期的構造はなく、ＤＣ的な案内溝
を用い、かつ、光スポット１つで、溝間のへラダーと情
報とを読み出す。JP-A-54-130103 proposes a method for correcting jitter by recording information between two servo tracks having a periodic structure. Two optical spots are required, one for recording and one for reading servo tracks. In the present invention, the guide grooves do not have a periodic structure, and a DC guide groove is used, and the information and the ladder between the grooves are read out with one light spot.
特開昭５８−４１４４６号では、追記型光ディスクで、
３つの光スポットを用いてトラッキングする際に、記録
された穴があっても、トラッキングが安定にかかるよう
に、溝間に穴を記録し、かつ、トラッキング用の２つの
光スポットが、穴を見ないような、広い溝間スペースを
設ける方式を提案している。本発明では、トラッキング
方法は、３つの光スポットを用いる方法に限らず、かつ
、溝間にヘッダーを設けている点が異なる６発明の目的
も異なる。JP-A No. 58-41446 discloses a write-once optical disc,
When tracking using three optical spots, the holes are recorded between the grooves so that tracking will be stable even if there are holes recorded, and the two optical spots for tracking We are proposing a method of creating wide groove spaces that are invisible to the naked eye. In the present invention, the tracking method is not limited to the method using three light spots, and the object of the six inventions is also different in that a header is provided between the grooves.
特開昭５８−８８８３８号では、追記型光ディスクで３
つの光スポットを用いてトラッキングする条件下で、Ｓ
／Ｎを上げるために、溝間に情報を記録することを提案
している０本発明では、ヘッダー信号ピットをあらかじ
め溝間に設けること、トラッキング方法が、３スポツト
法に限らないことで異なる。In JP-A-58-88838, 3
Under the condition of tracking using two light spots, S
The present invention, which proposes recording information between grooves in order to increase /N, differs in that header signal pits are provided between grooves in advance and that the tracking method is not limited to the three-spot method.
特開昭５８−２１８０３３号では、光磁気ディスクで、
３スポツト法で安定なトラッキングを行なうために、案
内溝を設け、かつ、溝間に情報を記録する方法゛を提案
している。本発明とは、ヘッダー信号ピットを溝間に設
けておくこと、トラッキングが３スポツト法に限らない
ことで異なる。In JP-A-58-218033, a magneto-optical disk is disclosed.
In order to perform stable tracking using the three-spot method, we have proposed a method in which guide grooves are provided and information is recorded between the grooves. This invention differs from the present invention in that header signal pits are provided between the grooves and tracking is not limited to the three-spot method.
本発明によれば、光デイスク媒体雑音の低いレベルでの
使用が可能となる。特に光磁気ディスクのように、Ｓ／
Ｎが小さい書き換え可能光ディスクの場合に、Ｓ／Ｎを
向上させる上で、効果がある。According to the present invention, it is possible to use an optical disk medium with a low level of noise. In particular, like magneto-optical disks, S/
This is effective in improving the S/N in the case of a rewritable optical disc with a small N.
また１本発明のカッティング装置によれば、簡易かつ安
定に同一トラック上になり、案内溝とヘッダ一部ピット
パターンの形成が可能な原盤カッティング装置を得るこ
とが出来る。本発明による原盤カッティング装置によっ
て作製さｔｂだｉ盤を用いて作った情報記録媒体は、従
来の案内溝トラック上にヘッダーピットのある場合にく
らべ、約３デシベルの、Ｉイズレベルの低減が計られた
。また光磁気記録方式においては、約１デシベルの信号
！ノベルの向上が得られた。Further, according to the cutting device of the present invention, it is possible to obtain a master disk cutting device that can simply and stably form a pattern on the same track and form a guide groove and a pit pattern in a part of the header. The information recording medium made using the TBD disk produced by the master disk cutting device of the present invention has an I-is level reduced by about 3 decibels compared to the conventional case where header pits are provided on the guide groove track. Ta. In addition, in the magneto-optical recording method, the signal is approximately 1 decibel! An improvement of the novel was obtained.
第１ＩＦｌは１本発明の情報記録媒体の一実施例を示し
、記録膜の一部を拡大した図、第２図は、従来方式の光
デイスク媒体構造を示す図、第３図は本発明のカッティ
ング装置の一実施例を示すブロック図、第４図は、案内
溝とへラダービットの位置関係を示す図、第５図はカッ
ティング装置の他の実施例を示すブロック図、第６図は
本発明の記録媒体を用いた光磁気情報記録再生装置の構
成を示すブロック図である。
１・・・案内溝、２・・・ヘッダー信号ビット、３・・
・記録磁化ドメイン、４・・・記録膜、１１・・・レー
ザ、１２゜１７．２４・・・光変調器、１３・・・ビー
ムスプリッタ−１１９・・・偏光ビームスプリッタ−１
２２・・・露光）Ｐｉｌ 図
第２ 図
第 ３ （２）
第 ４ 図1F1 shows an embodiment of the information recording medium of the present invention, and is an enlarged view of a part of the recording film.FIG. 2 is a diagram showing the structure of a conventional optical disk medium.FIG. A block diagram showing one embodiment of the cutting device, FIG. 4 is a diagram showing the positional relationship between the guide groove and the ladder bit, FIG. 5 is a block diagram showing another embodiment of the cutting device, and FIG. 6 is a diagram showing the positional relationship between the guide groove and the ladder bit. FIG. 1 is a block diagram showing the configuration of a magneto-optical information recording/reproducing apparatus using the recording medium of the invention. 1... Guide groove, 2... Header signal bit, 3...
- Recording magnetization domain, 4... Recording film, 11... Laser, 12° 17.24... Optical modulator, 13... Beam splitter-119... Polarizing beam splitter-1
22...Exposure) Pil Figure 2 Figure 3 (2) Figure 4
Claims (1)
やセクター番号の情報を持つ凹凸ピット状のヘッダーと
、光照射によつて状態が変化する薄膜とから成る情報記
録媒体において、該ヘッダーを該トラック案内用溝と溝
との間に設けたことを特徴とする光学的情報記録媒体。 ２、第１項において、光照射によつて状態が変化する薄
膜が垂直磁化膜である光学的情報記録媒体。 ３、第１項において、光照射によつて状態が変化する薄
膜が、結晶相と非晶質相との間を可逆的に変化する膜で
ある光学的情報記録媒体。 ４、第１項において、光照射によつて状態が変化する薄
膜が、光吸収による温度上昇で穴が形成される膜である
光学的情報記録媒体。 ５、感光性物質あるいは金属薄膜が表面に付与された円
板に、レーザビームをらせん状あるいは同心円状に露光
することにより潜像あるいは凹凸パターン形成を行うカ
ッティング装置において、露光用レンズに、同一レーザ
からディスク半径方向に互に異なる入射角を持つた２本
のレーザビームを入射させ、上記円板の半径方向に異な
る２ケ所に結像させ同時に２ケ所にパターンを形成する
ことを特徴とするカッティング装置。 ６、第５項において、露光用レンズに入射する２本のレ
ーザビームのうち少なくとも一方のビームの光路上に光
強度を変調する装置を有し、かつ２本のビームの偏光は
、互に逆方向に回転する円偏光であるか又は互に直交す
る直線偏光であることを特徴とするカッティング装置。 ７、第５項又は第６項において、上記２本のレーザビー
ムにより形成される円板上の２つのパターンの円板半径
方向の間隔は、上記らせん状あるいは同心円状トラック
の間隔のほぼ半分であり、一方のレーザビームは時間的
に連続であり、他方のレーザビームはパルス状に変調さ
れていることを特徴とするカッティング装置。 ８、第５項、第６項又は第７項において、上記２本のレ
ーザビームの強度は、露光しようとする円板の半径にほ
ぼ比例して、変調されることを特徴とするカッティング
装置。[Scope of Claims] 1. A disc-shaped substrate consisting of a groove for guiding information tracks, an uneven pit-shaped header having information such as a groove address and a sector number, and a thin film whose state changes when irradiated with light. 1. An optical information recording medium characterized in that the header is provided between the track guide grooves. 2. The optical information recording medium according to item 1, wherein the thin film whose state changes upon irradiation with light is a perpendicular magnetization film. 3. The optical information recording medium according to item 1, wherein the thin film whose state changes upon irradiation with light is a film that reversibly changes between a crystalline phase and an amorphous phase. 4. The optical information recording medium according to item 1, wherein the thin film whose state changes upon irradiation with light is a film in which holes are formed due to temperature rise due to light absorption. 5. In a cutting device that forms a latent image or uneven pattern by exposing a disc with a photosensitive substance or thin metal film on its surface to a laser beam in a spiral or concentric pattern, the same laser beam is used in the exposure lens. Cutting characterized in that two laser beams having mutually different incident angles are made incident in the radial direction of the disk, and images are formed at two different places in the radial direction of the disk to simultaneously form patterns in the two places. Device. 6. In item 5, a device for modulating the light intensity is provided on the optical path of at least one of the two laser beams incident on the exposure lens, and the polarization of the two beams is opposite to each other. A cutting device characterized in that it emits circularly polarized light that rotates in different directions or linearly polarized light that is perpendicular to each other. 7. In item 5 or 6, the distance in the disk radial direction between the two patterns on the disk formed by the two laser beams is approximately half the distance between the spiral or concentric tracks. A cutting device characterized in that one laser beam is temporally continuous and the other laser beam is modulated in a pulsed manner. 8. The cutting device according to item 5, item 6, or item 7, wherein the intensity of the two laser beams is modulated approximately in proportion to the radius of the disc to be exposed.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59133156A JPS6113458A (en) | 1984-06-29 | 1984-06-29 | Optical information recording medium and cutting device |
| US07/053,564 US4985881A (en) | 1983-12-23 | 1987-05-21 | Record carrier for a magneto-optical disc memory having guide grooves of a plurality of tracks disposed with a predetermined relation to light spot diameter |
| US07/617,006 US5161135A (en) | 1983-12-23 | 1990-11-21 | Magneto-optical disc memory apparatus including a header signal and magneto-optical signal level adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59133156A JPS6113458A (en) | 1984-06-29 | 1984-06-29 | Optical information recording medium and cutting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6113458A true JPS6113458A (en) | 1986-01-21 |
Family
ID=15098006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59133156A Pending JPS6113458A (en) | 1983-12-23 | 1984-06-29 | Optical information recording medium and cutting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6113458A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8601566A (en) * | 1985-06-19 | 1987-01-16 | Hitachi Ltd | DEVICE AND RECORD CARRIER FOR AN OPTICAL DISC MEMORY AND A MASTER DISC CUTTING DEVICE. |
| JPS63171445A (en) * | 1987-01-09 | 1988-07-15 | Hitachi Ltd | Optical master disk manufacturing equipment |
| JPH01159840A (en) * | 1987-12-17 | 1989-06-22 | Matsushita Electric Ind Co Ltd | Optical disk |
| JPH02239440A (en) * | 1989-03-14 | 1990-09-21 | Fujitsu Ltd | Optical disk |
| US5375109A (en) * | 1989-07-14 | 1994-12-20 | Deutsche Thomson-Brandt Gmbh | Magneto-optical recording and/or reproducing device |
| US6118748A (en) * | 1997-10-06 | 2000-09-12 | Fujitsu Limited | Optical information storage unit having phase compensation means for applying different phase compensation quantities with respect to signals detected from land and groove of recording medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58218033A (en) * | 1982-06-10 | 1983-12-19 | Canon Inc | Optomagnetic recorder |
| JPS5977648A (en) * | 1982-10-26 | 1984-05-04 | Sharp Corp | Photomagnetic storage element |
-
1984
- 1984-06-29 JP JP59133156A patent/JPS6113458A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58218033A (en) * | 1982-06-10 | 1983-12-19 | Canon Inc | Optomagnetic recorder |
| JPS5977648A (en) * | 1982-10-26 | 1984-05-04 | Sharp Corp | Photomagnetic storage element |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8601566A (en) * | 1985-06-19 | 1987-01-16 | Hitachi Ltd | DEVICE AND RECORD CARRIER FOR AN OPTICAL DISC MEMORY AND A MASTER DISC CUTTING DEVICE. |
| US4949331A (en) * | 1985-06-19 | 1990-08-14 | Hitachi, Ltd. | Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus |
| JPS63171445A (en) * | 1987-01-09 | 1988-07-15 | Hitachi Ltd | Optical master disk manufacturing equipment |
| US4953152A (en) * | 1987-01-09 | 1990-08-28 | Hitachi, Ltd. | Mastering machine for making an on-land recording master disk with two beam alignment servo loops |
| JPH01159840A (en) * | 1987-12-17 | 1989-06-22 | Matsushita Electric Ind Co Ltd | Optical disk |
| JPH02239440A (en) * | 1989-03-14 | 1990-09-21 | Fujitsu Ltd | Optical disk |
| US5375109A (en) * | 1989-07-14 | 1994-12-20 | Deutsche Thomson-Brandt Gmbh | Magneto-optical recording and/or reproducing device |
| US6118748A (en) * | 1997-10-06 | 2000-09-12 | Fujitsu Limited | Optical information storage unit having phase compensation means for applying different phase compensation quantities with respect to signals detected from land and groove of recording medium |
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