JPS6159673A - Track accessing method and optical disk of optical disk device - Google Patents
Track accessing method and optical disk of optical disk deviceInfo
- Publication number
- JPS6159673A JPS6159673A JP18031184A JP18031184A JPS6159673A JP S6159673 A JPS6159673 A JP S6159673A JP 18031184 A JP18031184 A JP 18031184A JP 18031184 A JP18031184 A JP 18031184A JP S6159673 A JPS6159673 A JP S6159673A
- Authority
- JP
- Japan
- Prior art keywords
- track
- mark
- optical disc
- optical disk
- optical
- 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
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10556—Disposition or mounting of transducers relative to record carriers with provision for moving or switching or masking the transducers in or out of their operative position
- G11B11/10563—Access of indexed parts
- G11B11/10565—Marks for track change, e.g. prepits, gray codes
-
- 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
- G11B11/10595—Control of operating function
-
- 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
- G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
- G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
-
- 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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08517—Methods for track change, selection or preliminary positioning by moving the head with tracking pull-in only
-
- 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
- G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0953—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for eccentricity of the disc or disc tracks
-
- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24085—Pits
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/49—Nc machine tool, till multiple
- G05B2219/49177—Runout, eccentricity, unbalance of tool or workpiece
Landscapes
- Signal Processing For Digital Recording And Reproducing (AREA)
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
- Moving Of Head For Track Selection And Changing (AREA)
Abstract
Description
【発明の詳細な説明】
(発明の分野)
本発明は、多数の同心円状またはらせん状のトラック上
に、トラックのアドレスなど2示すIDマークを記録し
、このIDマークご検出して所定のアドレスにデータな
記録したり、記録したデータを読出したりする光ディス
ク装置に適用されるトラックアクセス方法と、この方法
の実施に直接使用する光ディスクに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention records ID marks indicating track addresses, etc. on a large number of concentric or spiral tracks, and detects the ID marks to identify a predetermined address. The present invention relates to a track access method applied to an optical disk device for recording data on and reading recorded data, and an optical disk used directly to implement this method.
(発明の技術的背景および従来技術)
同心円状のトラック上に予め記録されたアドレスを示す
IDマークを検出して、データの記録。(Technical Background of the Invention and Prior Art) Data is recorded by detecting ID marks indicating addresses recorded in advance on concentric tracks.
再生を行う光ディスク装置がある。この場合データの書
込みおよび読出しを行うための光ヘッドを。There is an optical disc device that performs playback. In this case, an optical head for writing and reading data.
目標とするデータ2含むトラック(目標トラック)まで
速やかに移動させることが必要である。It is necessary to quickly move to the track containing the target data 2 (target track).
従来の光ディスク装置では、光ディスクの中心2通る線
上に、各トラックのIDマークを放射状に配ゴし、光ヘ
ッドの現在トラック位置から目標トラック位置付近まで
光ヘッドP移動した後、IDマークの内容を読出してそ
のトラック?識別し。In conventional optical disc devices, ID marks for each track are arranged radially on a line passing through the center 2 of the optical disc, and after the optical head P moves from the current track position of the optical head to near the target track position, the contents of the ID marks are read. Read that track? identify.
目標トラックと一致しない場合には再び目標トラック位
置まで移動し、同様な過程を繰り返して最終的に目標ト
ラック上に光ヘッドを到達させるようにしていた。すな
わち、10マークの内容を何度か読出して光ヘツド位置
ご修正する必要があった。また光ヘッドが光ディスクか
らIDマーク企読出して判断するには時間を要するし、
さらにIDマークの書込みエラー等を考慮して数個のI
Dマークのチェックが必要である。このように従来はI
Dマークの内容3何変も読出してヘッド位置を修正して
いたため、ヘッドの目標トラックへのアクセス時間が長
くなるという問題があった。If the optical head does not match the target track, the optical head is moved to the target track position again, and the same process is repeated until the optical head finally reaches the target track. That is, it was necessary to read out the contents of the 10 marks several times and correct the optical head position. Also, it takes time for the optical head to read and judge the ID mark from the optical disc.
Furthermore, in consideration of ID mark writing errors, etc., several I
It is necessary to check the D mark. In this way, conventionally I
Since the head position was corrected by reading out the content 3 of the D mark, there was a problem in that it took a long time for the head to access the target track.
(発明の目的)
本発明はこのような事情に鑑みなされたもので(以下余
白)
あり、光ディスク装置のトラックアクセス時間ご短かく
シ、高速かつ確実な目礪トラックへの光へ7Mのアクセ
スご可能にするトラックアクセス方法を提供することを
目的とする。(Purpose of the Invention) The present invention has been made in view of the above circumstances (see the margin below), and it is possible to shorten the track access time of an optical disk device, and to provide a fast and reliable 7M access to light to a target track. The purpose is to provide a track access method that allows.
また本発明は、このトラックアクセス方法の実施に直接
使用する光ディスクを提供すること?他の目的とする。Furthermore, the present invention provides an optical disc that is directly used to implement this track access method. For other purposes.
(発明の構成)
本発明によれば、前記目的は、トラック群を形成する複
数の各トラックにトラックアドレス等P示すためのID
マークを、前記各トラックの接線方向にずらせて光ディ
スクに予め記録しておき。(Structure of the Invention) According to the present invention, the object is to provide an ID for indicating a track address, etc., to each of a plurality of tracks forming a track group.
Marks are previously recorded on the optical disc while being shifted in the tangential direction of each track.
光ヘッドなその目標トラック位置と現在トラック位置と
の差に相当する距離だけ移動して、前記IDマークの基
点からの回転角度位置を検出し、この検出した回転角度
位置から目標トラック分検出することを特徴とする光デ
ィスク装置のトラックアクセス方法によって達成される
。The optical head is moved by a distance corresponding to the difference between its target track position and the current track position, detects the rotation angle position from the base point of the ID mark, and detects the target track from the detected rotation angle position. This is achieved by a track access method for an optical disc device characterized by the following.
また前記他の目的は、隣接する複数のトラックによって
トラック群が形成され、トラックアドレス等?示すため
のIDマークが前記トラック群内の各トラック上の接線
方向にずれた位置に記録されていることP特徴とする光
ディスクにより達成される。The other purpose is to form a track group by a plurality of adjacent tracks, track addresses, etc. This is achieved by an optical disc characterized in that an ID mark for indicating the present invention is recorded at a tangentially shifted position on each track in the track group.
本発明において、トラックは同心円状であってもらせん
状であってもよい。またトラックはグループなどの案内
溝があってもよいし、案内溝がなくてもよい。In the present invention, the tracks may be concentric or spiral. Further, the track may have a guide groove such as a group, or may not have a guide groove.
(実IM態様) 以下図面に基づき本発明の詳細な説明する。(Actual IM mode) The present invention will be described in detail below based on the drawings.
第1図は本発明の一実IM態様である光ディスク装置の
一部断面図を含む斜視図、第2図は同じく光ディスクの
一部平面図、第3図はその一部拡大図である。なお第2
図及び第3図では各IDマークの相対位置2大きく離し
て示しているが、実際は高密度に記録されていることは
勿論である。FIG. 1 is a perspective view including a partial sectional view of an optical disc device which is an IM embodiment of the present invention, FIG. 2 is a partial plan view of the same optical disc, and FIG. 3 is a partially enlarged view thereof. Furthermore, the second
In the figures and FIG. 3, the relative positions of the ID marks 2 are shown far apart, but it goes without saying that they are actually recorded at a high density.
第1図において符号10は光ディスクであり。In FIG. 1, reference numeral 10 is an optical disc.
たとえばガラスなどの透明基板の一方の而に金属分蒸着
し、この蒸着層を保護層で波器したものを用いることが
できる。なお光ディスクとしては各種の構造のもの2使
用しうることは勿論で1例えばトラックを同心円状やら
旋状に設けたもの、案内溝の無いものや有るもの、さら
には種々の記録再生方式のものなどが使用できる。この
光ディスク10は駆動モータ(図示せず)により、一定
速度で回転駆動される。For example, a metal may be deposited on one side of a transparent substrate such as glass, and this deposited layer may be corrugated with a protective layer. It goes without saying that various types of optical discs can be used as optical discs, such as discs with concentric or spiral tracks, discs with or without guide grooves, and discs with various recording and reproducing methods. can be used. This optical disc 10 is rotated at a constant speed by a drive motor (not shown).
12は記録・再生用の光学系ひ示し、この光学系12は
トラッキング誤差ざモータ14によって光ディスク10
の半径方向に移動可能な基台16と、この基台16上に
#C置された半導体レーザ18゜ビームスプリッタ20
1反射鏡22.光ヘッド24゜光検出器26等?備えて
いる。28は基台16の移動量牙検出する位置検出器で
ある。光ヘツド24内には、対物レンズを光ディスク1
0に垂直な方向に移動させるフォーカスサーボ機構と、
対物レンズを光ディスク10の半径方向に移動させるト
ラッキングサーボ機構とが内蔵されている。レーザエ8
の光は光ヘッド24から光ディスク10の記録面に焦点
を結ぶようにフォーカス制御され。Reference numeral 12 indicates an optical system for recording and reproducing, and this optical system 12 is operated by a tracking error motor 14 to read the optical disc 10.
A radially movable base 16 and a semiconductor laser 18° beam splitter 20 placed on this base 16.
1 Reflector 22. Optical head 24°, photodetector 26, etc.? We are prepared. A position detector 28 detects the amount of movement of the base 16. In the optical head 24, an objective lens is attached to the optical disk 1.
a focus servo mechanism that moves in a direction perpendicular to zero;
A tracking servo mechanism for moving the objective lens in the radial direction of the optical disc 10 is built-in. lasere 8
The focus of the light is controlled so that it is focused from the optical head 24 onto the recording surface of the optical disc 10.
この記録面で反射された光はビームスプリッタ20牙通
って光検出器26で検出される。この光検出器26の出
力に基づきフォーカス誤差、トラッキング誤差、および
記録面のデジタル信号が検出される。なおこのフォーカ
ス誤差によって光ヘツド24内蔵のフォーカスサーボ機
構が駆動される。The light reflected from this recording surface passes through the beam splitter 20 and is detected by the photodetector 26. Based on the output of the photodetector 26, a focus error, a tracking error, and a digital signal on the recording surface are detected. Note that this focus error drives a focus servo mechanism built into the optical head 24.
またトラッキング誤差は例えば低周波成分と高周波成分
とに分けられ、この低周波成分により前記トラッキング
サーボモーター4が、高周波成分により光ヘツド24内
蔵のトラッキングサーボ@Mがそれぞれ駆動されるよう
に構成される。Further, the tracking error is divided into, for example, a low frequency component and a high frequency component, and the configuration is such that the low frequency component drives the tracking servo motor 4, and the high frequency component drives the tracking servo @M built in the optical head 24, respectively. .
光ディスク10には例えば同心円状のトラックに沿って
多数のIDマーク記録部Aが設けられ。A large number of ID mark recording sections A are provided on the optical disc 10, for example, along concentric tracks.
ここにIDマークが予め記録される。このIDマークは
記録または再生するデータご識別するための情報であっ
て、トラック3示すためのトラックアドレス号含み、そ
の他にセクターアドレスを含んでもよい。また好ましく
はIDマークのはじめにセクターのはじまりを示すマー
クが記録される。An ID mark is recorded here in advance. This ID mark is information for identifying data to be recorded or reproduced, and includes a track address number to indicate track 3, and may also include a sector address. Preferably, a mark indicating the start of a sector is recorded at the beginning of the ID mark.
各トラック上にはnを整数として。On each track, n is an integer.
■= ” (rad )
毎にIDマークが予め記録され、このIDマークの後方
、すなわち第3図で光ディスク10は左方向に走行(回
転)するものとしてその右方に、データご記録するため
のデータ記録部Bが形成されている。■= An ID mark is recorded in advance for each rad, and an ID mark is recorded in advance for each rad. A data recording section B is formed.
各トラック上のIDマークは次のように配置される。す
なわち、まず隣接するN本のトラックにより1つのトラ
ック群が形成される。光ディスク10の所定の角度位置
2基点Cと決め、各トランク群の最も外側のトラック上
のIDマークをこの基点Cに置く。その内側のトラック
上のIDマークはこの基点Cから
θ=1−二
nN
だけずれた位置からはじまるように置かれる。各トラッ
ク上のIDマークは、このように順次接線方向に角度O
づれて予め記録されている。ID marks on each track are arranged as follows. That is, first, one track group is formed by N adjacent tracks. A predetermined angular position on the optical disk 10 is determined as a second base point C, and an ID mark on the outermost track of each trunk group is placed at this base point C. The ID mark on the inner track is placed so as to start from a position shifted from this base point C by θ=1−2 nN. The ID mark on each track is thus sequentially tangentially oriented at an angle O.
It has been recorded in advance.
次にデータご記録・再生するため、所定のデータへアク
セスする場合の順序を説明する。まず。Next, the order in which predetermined data is accessed in order to record and reproduce data will be explained. first.
光ヘッド24の現在の位置を、光ディスク10から読出
したIDマーク内のトラックアドレスから判別する。次
に目標とするトラック位置と検出ずみの現在のトラック
位置との差に相当する距離を求め、その距離だけ光ヘツ
ド24?移動させる。The current position of the optical head 24 is determined from the track address in the ID mark read from the optical disk 10. Next, a distance corresponding to the difference between the target track position and the detected current track position is determined, and the optical head 24 is moved by that distance. move it.
光ディスク10には必ず同心その他の誤差が伴うため、
これだけでは目標トラック上に光ヘッド企位置させるこ
とはできないので、一般にはトラックひ追従するために
トラッキングサーボ機構を作動させる。Since the optical disc 10 always has concentricity and other errors,
Since the optical head cannot be positioned on the target track by this alone, a tracking servo mechanism is generally operated to follow the track.
一方、光ディスク10の回転角度は適宜の手段によって
常に検出される。例えば前記基点Cに対応する位置企、
光ディスク10に予め設けた切欠きと、光源および光検
出器との組合せによって検出することによって巻ディス
ク10の回転角度を求めることができる。また基点Cか
ら角度■毎に。On the other hand, the rotation angle of the optical disc 10 is always detected by appropriate means. For example, a position plan corresponding to the base point C,
The rotation angle of the wound disk 10 can be determined by detection using a combination of a notch provided in the optical disk 10, a light source, and a photodetector. Also, for each angle ■ from base point C.
この基点Cと区別可能な別の切欠きを設けておき。Another notch that can be distinguished from this base point C is provided.
各トラック群の最外周上のIDマークと新たな基点りと
して回転角度を検出してもよい。The rotation angle may be detected using the ID mark on the outermost circumference of each track group and a new base point.
このようにして各トラック群の最外周のIDマークの位
置e基阜にした光ディスク10の回11云角度が常時検
出されているので、目標トラック位問付近に移動した光
ヘッド24がIDマークご検出すると、この検出した時
点での回転角度αが求められる。この回転角度αは各ト
ラック群内における一つのトラックに対応している。す
なわち、トラック群の最外周トラックであれば。In this way, since the angle 11 of the optical disk 10 based on the position e of the outermost ID mark of each track group is constantly detected, the optical head 24 that has moved near the target track position Once detected, the rotation angle α at the time of detection is determined. This rotation angle α corresponds to one track within each track group. That is, if it is the outermost track of the track group.
α=0 最外周トラックからm番目のトラックであれば。α=0 If it is the mth track from the outermost track.
となるからである。従って光ディスクloの外周側から
1番目のトラック群内のm番目のトラックであれば、光
ディスク10の外matから1−N+m
番目のトラックであることが判別できる。なお1番目の
トラック群であることは、光ヘッドの移動時に位置検出
器などによって検出される。また現在のトラックも何番
目のトラック群の何番目のトラックであるかは常に検出
されている。This is because. Therefore, if it is the m-th track in the first track group from the outer circumferential side of the optical disc lo, it can be determined that it is the 1-N+m-th track from the outer mat of the optical disc 10. Note that the fact that it is the first track group is detected by a position detector or the like when the optical head moves. Furthermore, the number of the current track in the track group is always detected.
このようにIDマークの回転角度位置から目標とするト
ラックご判別するが、このとき、この目標トラック上に
光ヘッド242位置させるようトランキングサーボを作
動させる。そしてこの目標トラック上のIDマークの内
容あるいは基点Cからの回転角度から目標とするアドレ
スのセクター?検出してそのデータ記録部Bでデータの
記録あるいはデータの読出しを行なう。In this way, the target track is determined from the rotation angle position of the ID mark. At this time, the trunking servo is operated to position the optical head 242 on the target track. And is it the sector of the target address based on the contents of the ID mark on this target track or the rotation angle from the base point C? The data is detected and data is recorded or read in the data recording section B.
IDマークにはトラックアドレスが記鑞されているが、
セクターアドレスは基点Cからの回転角度で検出できる
ので1セクターアドレスは記録されていても、記録され
てなくてもよい。また目標トラックは回転角度で判定さ
れるが、さらにIDマーク中のトラックアドレスご読出
して二重にチェックしてもよい。The truck address is written on the ID mark,
Since the sector address can be detected by the rotation angle from the base point C, one sector address may or may not be recorded. Although the target track is determined based on the rotation angle, the track address in the ID mark may be read out for double checking.
なお本発明においては、トラック群の幅が光ディスク1
0の偏心量よりも常に大きくなるように設定しておくの
が望ましい。この場合には、光ヘッド24の現在トラッ
ク位置と目標トラック位置との差に相当する距離だけ光
ヘッド24を移動させる際に、目標トラックからN本以
上ずれた他のトラック付近に光ヘッド24が移動するお
それが無く、トラックアクセスタイムが一層短かくなる
。Note that in the present invention, the width of the track group is equal to the width of the optical disc 1.
It is desirable to set the amount of eccentricity so that it is always larger than the amount of eccentricity of 0. In this case, when moving the optical head 24 by a distance corresponding to the difference between the current track position and the target track position of the optical head 24, the optical head 24 may be moved near another track that is shifted by N or more lines from the target track. There is no risk of movement, and track access time is further shortened.
本発明は前述の実施態様に限定されるものではないこと
は明白である。It is clear that the invention is not limited to the embodiments described above.
(発明の効果)
本発明は以上のように、IDマーク2トラツク群な形成
する各トラック毎に接線方向にずらせて予め記録してお
き、IDマークの基点からの回転角度位置によって迅速
に目標トラックご判別する。(Effects of the Invention) As described above, the present invention records data in advance in a tangential direction for each track forming a two-track group of ID marks, and quickly tracks the target track based on the rotation angle position from the base point of the ID mark. Please judge.
従って光ディスクの中心ご通る線上に各ト、ラックのI
Dマークを放射状に配置した従来装置のように、IDマ
ークの記録内容を何度も判別しつつ目標トラック号検出
する方法に比べ、トラックアクセス時間ご短縮できると
いう効果が得られる。またIDマークからトラックアド
レスあるいはセクターアドレスな読出すことによって、
トラックあ゛るいはセクターを回転角度だけでなく、こ
れら読出したトラックアドレスあるいはセクターアドレ
スにより二重に確認することもできるので、より信頼性
の高いトラックアクセス方法が可能である。Therefore, the I of each track and rack should be placed on a line passing through the center of the optical disc.
Compared to a conventional device in which D marks are arranged radially, which detects the target track number while repeatedly determining the recorded contents of the ID mark, the present invention has the advantage that the track access time can be shortened. Also, by reading the track address or sector address from the ID mark,
Since the track or sector can be confirmed not only by the rotation angle but also by the read track address or sector address, a more reliable track access method is possible.
第1図は本発明の一実施態様である光ディスク装置の一
部の断面図を含む斜視図、第2図は同じく光ディスクの
一部の平面図、第3図はその一部拡大図である。
10・・・光ディスク、 A・・・IDマーク記録部。
B・・・データ記録部、 C・・・基点。
D・・・新たな基点。FIG. 1 is a perspective view including a cross-sectional view of a portion of an optical disk device according to an embodiment of the present invention, FIG. 2 is a plan view of a portion of the optical disk, and FIG. 3 is a partially enlarged view thereof. 10... Optical disc, A... ID mark recording section. B...Data recording section, C...Base point. D...New base point.
Claims (5)
トラックで接線方向にずらせてあらかじめ記録された光
ディスクを光ディスク装置でトラックアクセスする方法
において、光ディスク装置の光学ヘッドを現在位置から
目標のトラックに相当する位置まで移動させ、トラック
の前記IDマークの光ディスクの基点からの回転角度を
検出することによつて目標トラックを検出することを特
徴とする光ディスク装置のトラックアクセス方法。(1) In a method of track accessing an optical disc using an optical disc device, on which ID marks indicating track addresses, etc. are pre-recorded with tangential shifts on adjacent tracks, the optical head of the optical disc device is moved from the current position to the target track. 1. A track access method for an optical disc device, characterized in that a target track is detected by moving the ID mark of the track to a base point of the optical disc and detecting a rotation angle of the ID mark of the track from a base point of the optical disc.
求の範囲第1項記載の光ディスク装置のトラックアクセ
ス方法。(2) A track access method for an optical disc device according to claim 1, wherein the tracks are concentric circles.
請求の範囲第1項記載の光ディスク装置のトラックアク
セス方法。(3) A track access method for an optical disc device according to claim 1, wherein the track has a spiral shape.
成され、トラックアドレス等を示すIDマークが前記ト
ラック群内の各トラック上の接線方向にずれた位置に記
録されていることを特徴とする光ディスク。(4) A track group is formed by a plurality of adjacent tracks, and an ID mark indicating a track address etc. is recorded at a position shifted in a tangential direction on each track in the track group. optical disk.
くされていることを特徴とする特許請求の範囲第4項記
載の光ディスク。(5) The optical disc according to claim 4, wherein the width of the track group is larger than the eccentricity of the optical disc.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18031184A JPS6159673A (en) | 1984-08-31 | 1984-08-31 | Track accessing method and optical disk of optical disk device |
US06/770,416 US4884259A (en) | 1984-08-28 | 1985-08-28 | Optical memory disk and track access therefor |
EP85110851A EP0177737A3 (en) | 1984-08-28 | 1985-08-28 | Optical memory disk and track access therefor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18031184A JPS6159673A (en) | 1984-08-31 | 1984-08-31 | Track accessing method and optical disk of optical disk device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6159673A true JPS6159673A (en) | 1986-03-27 |
Family
ID=16080992
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18031184A Pending JPS6159673A (en) | 1984-08-28 | 1984-08-31 | Track accessing method and optical disk of optical disk device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6159673A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0262727A (en) * | 1988-08-30 | 1990-03-02 | Hitachi Maxell Ltd | Optical disk and optical disk device |
JPH02134771A (en) * | 1988-11-15 | 1990-05-23 | Osaka Gas Co Ltd | Recording and reproducing method for information to and from rotary recording medium |
JPH02172040A (en) * | 1988-12-23 | 1990-07-03 | Fujitsu Ltd | Optical disk |
US5444679A (en) * | 1992-12-28 | 1995-08-22 | Samsung Electronics Co., Ltd. | Optical disk driver for reading data from a disk based on ID information |
-
1984
- 1984-08-31 JP JP18031184A patent/JPS6159673A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0262727A (en) * | 1988-08-30 | 1990-03-02 | Hitachi Maxell Ltd | Optical disk and optical disk device |
JPH02134771A (en) * | 1988-11-15 | 1990-05-23 | Osaka Gas Co Ltd | Recording and reproducing method for information to and from rotary recording medium |
JPH02172040A (en) * | 1988-12-23 | 1990-07-03 | Fujitsu Ltd | Optical disk |
US5444679A (en) * | 1992-12-28 | 1995-08-22 | Samsung Electronics Co., Ltd. | Optical disk driver for reading data from a disk based on ID information |
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