JPS5938939A - Optical disk - Google Patents

Optical disk

Info

Publication number
JPS5938939A
JPS5938939A JP14764382A JP14764382A JPS5938939A JP S5938939 A JPS5938939 A JP S5938939A JP 14764382 A JP14764382 A JP 14764382A JP 14764382 A JP14764382 A JP 14764382A JP S5938939 A JPS5938939 A JP S5938939A
Authority
JP
Japan
Prior art keywords
signal
track
output
center
prewobbled
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.)
Granted
Application number
JP14764382A
Other languages
Japanese (ja)
Other versions
JPH0680535B2 (en
Inventor
Kazuo Takasugi
高杉　和夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14764382A priority Critical patent/JPH0680535B2/en
Publication of JPS5938939A publication Critical patent/JPS5938939A/en
Publication of JPH0680535B2 publication Critical patent/JPH0680535B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • 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
    • 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
    • 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
    • G11B7/0901—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 for track following only
    • G11B7/0904—Dithered tracking systems

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To compensate the output of a signal detector with an output of wave detection, by recording a bit of a specific depth which is prewobbled based on a fixed rule, detecting the reproduced waveform of the bit based on a wobble rule and sampling and holding the output of wave detection. CONSTITUTION:It is supposed that a lead light spot passes over a dotted line with the spot center shifted to either one side not the center 210 of a track to a bit train 300 which is prewobbled up to lambda/4 depth (lambda: wavelength of reproduced light). In such a case, a lead waveform is obtained as shown by (b). The lead waveform has an amplification difference DELTA to a shift amount delta from the center of the track. The synchronous wave detection is given to the amplification difference with reference timing as shown by (c) to obtain a DC signal corresponding to an amplitude difference DELTA. Both the reference timing of (c) and a gate signal can be easily produced from a synchronous signal. A gate signal of (d) is used as a control signal to extract a prewobbled region. This process can give an integrated compensation to an offset contained in an optical system of an electric system of a 2D circuit.

Description

【発明の詳細な説明】 本発明は光ディスク、特にトラッキング制御の精度を向
上させた光ディスクに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical disc, and particularly to an optical disc with improved tracking control accuracy.

光デイスク上にトラック情報として案内溝（グループと
呼ぶ）を設け、グループからの信号な基にトラッキング
しながら情報をリード、ライトする方式の光ディスクお
よび装置が提案されている。Optical discs and devices have been proposed in which guide grooves (referred to as groups) are provided as track information on an optical disc, and information is read and written while tracking based on signals from the groups.

本方式でのトラッキング信号の検出は、レーザ光ブでの
絞り込まれたレーザスポットの回折を利用するもので、
グループ両側での回折光強度が平衡する位置にレーザス
ポラトラ導くようなサーボ系で制御される。上記方式を
グループ両側の回折光を２つの検出器（２１）ｅｔｅｃ
ｔｏｒ　）で受け、その差動値が零になるように制御す
ることから、２Ｄ方式と呼ぶことにする。２Ｄ方式の問
題点は光スポットとディスクの相対的な角度が変動する
と、上記２つの検出器への反射光分布の対称性が悪くな
シ、そのためトラッキング制御に無視しえないオフセッ
トが生じることである。上記相対角度は、ディスクの傾
きや振動などで生ずるから、上記オフセツＩｆ許容値に
おさえるためには、装置やディスクの機械的精度をよシ
厳しくしなければならない。このため装置の設計や製作
上の制限あるいはディスク媒体の材質上の制限などが必
要であるという問題がある。Tracking signal detection in this method uses diffraction of a narrowed laser spot in a laser beam.
It is controlled by a servo system that guides the laser beam to a position where the intensity of the diffracted light on both sides of the group is balanced. The above method uses two detectors (21) etec to detect the diffracted light on both sides of the group.
tor ) and is controlled so that the differential value becomes zero, so it is called the 2D method. The problem with the 2D method is that when the relative angle between the optical spot and the disk changes, the symmetry of the reflected light distribution to the two detectors described above becomes poor, resulting in a non-negligible offset in tracking control. be. Since the above-mentioned relative angle is caused by the inclination or vibration of the disk, in order to keep the offset If within the above-mentioned allowable value, the mechanical precision of the device and the disk must be made even stricter. Therefore, there is a problem in that restrictions must be placed on the design and manufacturing of the device, or on the material of the disk medium.

本発明の目的はトラッキング信号に含まれるオフセット
信号を補正することができる光デイスク装置をうろこと
にある。SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disk device capable of correcting an offset signal included in a tracking signal.

２Ｄ方式でのディスクの傾きによるオフセットあるいは
検出系や増幅器によるオフセットなど、トラッキング信
号に含まれるオフセットは、トラックの中心であること
が保証された基準信号があれば、それを補正することが
できる。本発明はこたピットを用いる。補正信号の極性
は基準信号のプリウオーブル極性によって決めるもので
ある。Offsets included in the tracking signal, such as offsets due to the inclination of the disk in the 2D system or offsets due to the detection system or amplifier, can be corrected if there is a reference signal that is guaranteed to be at the center of the track. The present invention uses a kota pit. The polarity of the correction signal is determined by the prewobble polarity of the reference signal.

以下実施例によシ本発明の詳細な説明する。第１図は光
デイスク装置の概略を示す図である。ディスク２０はモ
ータ３０で回転される。ヘッド１０はヘット駆動機構４
０で目的のトラックに位置付けされる。ヘッド１０には
レーザ１．光学系２、光検出器３等を含む。位置決めの
ための信号は光検出器３よシ光スポット制御回路５０に
より駆動機構４０の制御信号となる。レーザ１にはライ
ト回路７０からライト情報に従った変調信号が与えられ
る。ディスクからのリード信号は光検出器３よシリード
回路６０で復調される。８０はリードライト信号処理回
路である。第２図はディスク２０の概略を示し、トラッ
ク２１が同心円またはらせん状に作られている。トラッ
クは１周をいくつかのセクタに分割されている。各々の
セクタのフォーマット例を第３図に示す。セクタはヘッ
ダ部１００とデータ部２００に分けられ、ヘッダ部１０
０にはその部分のトラックセクタのアドレスが記録され
る。データ部２００にはディスクへの真のデータが記録
される。さらにヘッダ部１００の記録例としてはセクタ
の始点を示すマーク１１０（ＳＭ）　、クロックの基準
を示す部分１２０（ＶＦＯ）、同期信号１３０　（８Ｙ
ＮＣ）、７）”Ｌ／ス１４０（ＩＤ）、ヘッダ部の処理
時間のためのギャップ１５０（ＧＡＰ）等が記録される
。The present invention will be explained in detail by way of examples below. FIG. 1 is a diagram schematically showing an optical disk device. The disk 20 is rotated by a motor 30. The head 10 is a head drive mechanism 4
0 positions the target track. The head 10 includes a laser 1. It includes an optical system 2, a photodetector 3, etc. A signal for positioning is transmitted from the photodetector 3 to a control signal for the drive mechanism 40 by the light spot control circuit 50. A modulation signal according to write information is applied to the laser 1 from a write circuit 70. The read signal from the disk is demodulated by the photodetector 3 and the serial read circuit 60. 80 is a read/write signal processing circuit. FIG. 2 schematically shows a disk 20, in which tracks 21 are formed concentrically or spirally. One lap of the track is divided into several sectors. An example format of each sector is shown in FIG. A sector is divided into a header part 100 and a data part 200.
In 0, the address of the track sector of that part is recorded. The data portion 200 records the true data on the disc. Furthermore, examples of recording in the header section 100 include a mark 110 (SM) indicating the start point of a sector, a section 120 (VFO) indicating a clock reference, and a synchronization signal 130 (8Y
NC), 7)"L/space 140 (ID), gap 150 (GAP) for header processing time, etc. are recorded.

トラッキング制御はトラック上に記録されたデータをリ
ードしあるいはライトするためになされるのであるから
、あらかじめトラックの中心に作られた情報ピットであ
ればそれを最も良くリードできる状態が最良のトラッキ
ング状態のはずであ。Tracking control is performed to read or write data recorded on a track, so if there is an information pit created in advance at the center of the track, the best tracking state is when it can be read best. It's supposed to be.

る。したがって上記ヘッダ部をグループと同時に作製す
る形式のディスクあるいはヘッダ部の情報ピット自体が
トラック信号である形式のディスクではヘッダ部情報ピ
ットはトラックの中心にあることが保証されている。従
ってヘッダ部の信号の７最良のリード状態と、トラッキ
ング信号検出回路からのトラック中心を示す状態との間
に相違があればヘッダ部の最良リード条件によってトラ
ッキング検出信号を補正することができる。ヘッダ部信
号の最良リード条件は、いわゆるプリウォーブリングさ
れたピットから見出すことができる。プリウォーブリン
グ方式によりトランクの中心を見出すにはあらかじめど
のような形でウオーブルされているかの情報が必要であ
る。そこで第３図のフォーマットに於けるギャップ１５
００部分がたとえば第４図の如くトラックの左右に同量
だけ一定の規則でウオーブルさせておけば、ギャップ１
５０の正確な位置はリード時に同期信号１３０によって
知ることができるから、同期信号から作られるタイミン
グ信号とあらかじめ定めたウオーブル規則によシリード
信号波形を調べ、そのときのトラッキング状態が左右い
ずれの側にどの程度のズレを持っているかを検出するこ
とができる。Ru. Therefore, in a disc in which the header part is produced at the same time as a group, or in a disc in which the information pit in the header part itself is a track signal, it is guaranteed that the header part information pit is located at the center of the track. Therefore, if there is a difference between the best read condition of the header section signal and the state indicating the track center from the tracking signal detection circuit, the tracking detection signal can be corrected based on the best read condition of the header section. The best read conditions for header signals can be found from so-called pre-wobbled pits. In order to find the center of the trunk using the pre-wobbling method, information on how the trunk is wobbled is required in advance. Therefore, gap 15 in the format shown in Figure 3
If the 00 portion is wobbled by the same amount on the left and right sides of the track as shown in Figure 4, the gap 1
Since the exact position of 50 can be known from the synchronization signal 130 when reading, the serial read signal waveform is checked using the timing signal generated from the synchronization signal and a predetermined wobble rule, and the tracking state at that time is determined on either the left or right side. It is possible to detect the degree of deviation.

なお、第５図において２１０はグループ、３００はピッ
トである。従って上記ズレ量にょシトラッキング信号を
補正して正しいトラッキング信号を得ることができる。In FIG. 5, 210 is a group, and 300 is a pit. Therefore, a correct tracking signal can be obtained by correcting the tracking signal due to the amount of deviation.

ただし以上の補正は、トラック上のすべての点でできる
わけではないから、たとえばあるセクタのギャップ１５
０の位置での補正量は、次のセクタのギャップが来るま
でホールドしておく必要がある。以下上記動作を実現す
る実施例につき説明する。However, the above correction cannot be made at all points on the track, so for example, the gap 15 of a certain sector
The correction amount at the 0 position must be held until the next sector gap arrives. An embodiment that realizes the above operation will be described below.

第５図で（イ）の如くプリウォーブリングされたピット
列に対し、リード光スポットがトラックの中心ではなく
一方に片寄ってスポット中心が点線上を通ったとすると
（ロ）のようなリード波形となる。In Figure 5, for a pre-wobbled pit row as shown in (a), if the lead light spot is shifted to one side instead of the center of the track and the spot center passes on the dotted line, the lead waveform will be as shown in (b). .

即ち光スポットのトラック中心からのズレ量δに対して
リード波形に△の振幅差が生じる。これを（ハ）の如き
基準タイミングで同期検波することによシ振幅差Δに対
応した直流信号を得る。（ハ）の基準タイミングおよび
に）のゲート信号は同期信号から容易に作ることができ
る。に）のゲート信号はプリウオーブルされた領域を抜
き出すための制御信号として用いる。第６図は上述の補
正付トラッキング信号回路の実施例を示す回路構成図で
ある。That is, an amplitude difference of Δ occurs in the read waveform with respect to the amount of deviation δ of the optical spot from the track center. By synchronously detecting this at the reference timing as shown in (c), a DC signal corresponding to the amplitude difference Δ is obtained. The reference timing in (c) and the gate signal in (c) can be easily created from a synchronization signal. The gate signal in ) is used as a control signal for extracting the prewobbled region. FIG. 6 is a circuit diagram showing an embodiment of the above-mentioned corrected tracking signal circuit.

３１．３２は２Ｄ信号検出の２つの光検出器でその差信
号用が増幅器５１で作られトラッキング信号のもととな
る。一方２Ｄ出力の和信号を増幅器６１で作る。これは
通常のデータリード信号である。これからピーク検出回
路６２．クロック再生回路６３．同期信号検出回路６４
２等の回路によシタイミング回路６５で第５図（ハ）の
基準タイミング信号６５０および第５図に）のゲート信
号６５１を発生させる。増幅器６１の出力とタイミング
信号６５０とから同期検波回路６６で第５図（ロ）の△
に対応した量を発生させる。この出力をゲート信号６５
１の制御によシサンプルホールド回路６７に取込みゲー
ト信号６５１が“ｔｌ”の区間でサンプルし、′０″の
区間でホールドする。ホールドされた信号値６７０は適
当な係数Ｇ’ｋかけ、前記２Ｄからの検出信号５２と加
算器５３で加算されトラッキング制御信号５５となる。31 and 32 are two photodetectors for 2D signal detection, and the difference signal between them is produced by an amplifier 51 and becomes the source of a tracking signal. On the other hand, an amplifier 61 generates a sum signal of the 2D output. This is a normal data read signal. From now on, the peak detection circuit 62. Clock regeneration circuit 63. Synchronous signal detection circuit 64
The reference timing signal 650 shown in FIG. 5(c) and the gate signal 651 shown in FIG. From the output of the amplifier 61 and the timing signal 650, the synchronous detection circuit 66 detects △ in FIG.
Generate an amount corresponding to. This output is used as gate signal 65
1, the sample and hold circuit 67 samples the gate signal 651 in the "tl" interval and holds it in the '0' interval.The held signal value 670 is multiplied by an appropriate coefficient G'k and calculated as described above. The detection signal 52 from the 2D and the adder 53 are added to form a tracking control signal 55.

ここでサンプルボールド回路６７の出力６７０は、第５
図に示した光スポットのトラック中心からのズレの方向
及びズレ量に従い、その極性及び絶対値が変化する。上
記ズレ量と、補正信号５４の関係は関数発生器６８の入
出力特性を適当に選ぶことで変えることができる。Here, the output 670 of the sample bold circuit 67 is the fifth
The polarity and absolute value change according to the direction and amount of deviation of the light spot from the track center shown in the figure. The relationship between the amount of deviation and the correction signal 54 can be changed by appropriately selecting the input/output characteristics of the function generator 68.

以上説明した如く本発明によれば、ディスクの傾きによ
る２Ｄ検出器でのトラッキング信号のオフセツトヲ補償
できる他、２Ｄ回路の光学系や電気回路系に含まれるオ
フセットを総合的に補償することができる。補償は連続
でなくザンブリング的になるがオフセットが生じる原因
そのものの周波数は非常に低く、トラック１周に１０回
程度のサンプリングで十分であるのに対し、通常１トラ
ツクを数１０のセクタに分割するからサンプリング周波
数としては全く問題ない。すなわち本発明を実施するう
えで新たに基準ピント領域を設ける必要はない。As described above, according to the present invention, it is possible not only to compensate for the offset of the tracking signal in the 2D detector due to the inclination of the disk, but also to comprehensively compensate for the offset included in the optical system and electric circuit system of the 2D circuit. Compensation is not continuous but zumbling, but the frequency that causes the offset is very low, and sampling about 10 times per track is sufficient, whereas normally one track is divided into several dozen sectors. Therefore, there is no problem at all as a sampling frequency. That is, there is no need to newly provide a reference focus area when implementing the present invention.

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

第１図は光デイスク装置の構成概要を示す図、第２図は
ディスク上のトラックの様子を示す図、第３図はセクタ
フォーマットの一例を示す図、輌４図はブリウオーブル
された基準ピットの一例を示す図、第５図は基準ピット
から補正信号を発生するための信号波形を示す図、第６
図は補正信号笥１図 ３０ 第　２　図 第　３　図 χ　４　図 ’１Ｆ）５　　図 （ニ）Figure 1 is a diagram showing an overview of the configuration of an optical disc device, Figure 2 is a diagram showing the state of tracks on a disc, Figure 3 is a diagram showing an example of a sector format, and Figure 4 is a diagram showing a pre-wobbled reference pit. Figure 5 is a diagram showing an example, and Figure 5 is a diagram showing a signal waveform for generating a correction signal from the reference pit.
The figure shows the correction signal.

Claims (1)

【特許請求の範囲】[Claims] ディスク上に同心円またはらせん状に作られたトラック
案内溝を有し、該トラックからの回折光の平衡度を検出
するトラック信号検出器と、トラック上に記録され、あ
らかじめ定めた規則に従っ生先の波長）もしくは濃淡ピ
ットがトラック上の複数のあらかじめ定めた領域に記録
されてお夛、該ピットの再生波形を上記ウオーブル規則
に従って検波する手段と、該検波出力をサンプルし、前
記ピットが記録されていない区間ホールドする手段と、
該ホールド手段の出力によシ前記トラック信号検出器の
出力を補正しうる如く構成したことを特徴とする光ディ
スク。A track signal detector has a track guide groove formed in a concentric circle or a spiral shape on the disk, and detects the balance of diffracted light from the track, and a track signal detector that detects the balance of diffracted light from the track, and wavelength) or light and dark pits are recorded in a plurality of predetermined areas on the track, a means for detecting a reproduced waveform of the pits according to the wobble rule, and a means for sampling the detection output and recording the pits. a means for holding the section where the
An optical disc characterized in that the output of the track signal detector can be corrected based on the output of the holding means.
JP14764382A 1982-08-27 1982-08-27 Information recording / playback method Expired - Lifetime JPH0680535B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14764382A JPH0680535B2 (en) 1982-08-27 1982-08-27 Information recording / playback method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14764382A JPH0680535B2 (en) 1982-08-27 1982-08-27 Information recording / playback method

Publications (2)

Publication Number Publication Date
JPS5938939A true JPS5938939A (en) 1984-03-03
JPH0680535B2 JPH0680535B2 (en) 1994-10-12

Family

ID=15434973

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14764382A Expired - Lifetime JPH0680535B2 (en) 1982-08-27 1982-08-27 Information recording / playback method

Country Status (1)

Country Link
JP (1) JPH0680535B2 (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6129428A (en) * 1984-06-19 1986-02-10 Olympus Optical Co Ltd Offset control circuit of optical information recording and reproducing device
JPS61224145A (en) * 1985-03-29 1986-10-04 Hitachi Ltd Optical information recording and reproducing system
JPS61292226A (en) * 1985-06-19 1986-12-23 Hitachi Ltd Information recording medium and its recording and reproducing device
JPS61294640A (en) * 1985-06-21 1986-12-25 Hitachi Ltd Optical information recording and reproducing system
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.
JPS628341A (en) * 1985-07-05 1987-01-16 Hitachi Ltd Optical information storing and reproducing device
JPS6246441A (en) * 1985-08-23 1987-02-28 Hitachi Ltd Optical information recording and reproducing device
JPS6289241A (en) * 1985-10-16 1987-04-23 Hitachi Ltd Optical information recording and reproducing device
JPS62145538A (en) * 1985-12-20 1987-06-29 Hitachi Ltd Optical disk tracking system
NL8603227A (en) * 1985-12-20 1987-07-16 Hitachi Ltd TRACKING SERIES SYSTEM AND OPTICAL DISC DEVICE USING THIS SYSTEM.
JPS62183037A (en) * 1985-07-29 1987-08-11 Hitachi Ltd Optical information recording and reproducing system
JPS62208436A (en) * 1986-03-07 1987-09-12 Sony Corp Disk recording and reproducing device capable of recording optically
JPS62229534A (en) * 1986-03-31 1987-10-08 Hitachi Ltd Tracking system
US4748609A (en) * 1985-03-29 1988-05-31 Hitachi, Ltd. Method and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offset
EP0270118A2 (en) * 1986-12-03 1988-06-08 Fujitsu Limited Apparatus for recording and reading an optical disc, having reduced offset in its tracking error signal
US5132953A (en) * 1985-06-21 1992-07-21 Olympus Optical Co., Ltd. Multi-beam optical recording/reproducing apparatus for recording/reproducing on a medium having a recording flat part with a guide groove on each side
JPH07302428A (en) * 1995-05-17 1995-11-14 Hitachi Ltd Tracking method
US6407967B1 (en) 1998-06-10 2002-06-18 Fujitsu Limited Optical apparatus, tracking apparatus and optical disk apparatus
US6549493B1 (en) 1998-09-14 2003-04-15 Matsushita Electric Industrial Co., Ltd. Tilt detection device, optical disc device, and tilt control method
US6556520B1 (en) 1998-08-29 2003-04-29 Samsung Electronics Co., Ltd. Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecting tracking error, and method of detecting tilt error
US6674707B2 (en) 2000-01-17 2004-01-06 Matsushita Electric Industrial Co., Ltd. Digital recorded data reproducing device
US8780683B2 (en) 2011-04-11 2014-07-15 Panasonic Corporation Information recording medium, tracking method, and optical information apparatus

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JP2571204B2 (en) * 1984-06-19 1997-01-16 オリンパス光学工業株式会社 Offset adjustment circuit for optical information recording / reproducing device
JPS6129428A (en) * 1984-06-19 1986-02-10 Olympus Optical Co Ltd Offset control circuit of optical information recording and reproducing device
JPS61224145A (en) * 1985-03-29 1986-10-04 Hitachi Ltd Optical information recording and reproducing system
US4748609A (en) * 1985-03-29 1988-05-31 Hitachi, Ltd. Method and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offset
JPS61292226A (en) * 1985-06-19 1986-12-23 Hitachi Ltd Information recording medium and its recording and reproducing device
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
US5084860A (en) * 1985-06-19 1992-01-28 Hitachi Ltd. Apparatus for optical disc memory with correction pattern and master disc cutting apparatus
US5132953A (en) * 1985-06-21 1992-07-21 Olympus Optical Co., Ltd. Multi-beam optical recording/reproducing apparatus for recording/reproducing on a medium having a recording flat part with a guide groove on each side
JPS61294640A (en) * 1985-06-21 1986-12-25 Hitachi Ltd Optical information recording and reproducing system
JPS628341A (en) * 1985-07-05 1987-01-16 Hitachi Ltd Optical information storing and reproducing device
JPS62183037A (en) * 1985-07-29 1987-08-11 Hitachi Ltd Optical information recording and reproducing system
JPS6246441A (en) * 1985-08-23 1987-02-28 Hitachi Ltd Optical information recording and reproducing device
JPS6289241A (en) * 1985-10-16 1987-04-23 Hitachi Ltd Optical information recording and reproducing device
JPS62145538A (en) * 1985-12-20 1987-06-29 Hitachi Ltd Optical disk tracking system
NL8603227A (en) * 1985-12-20 1987-07-16 Hitachi Ltd TRACKING SERIES SYSTEM AND OPTICAL DISC DEVICE USING THIS SYSTEM.
JPS62208436A (en) * 1986-03-07 1987-09-12 Sony Corp Disk recording and reproducing device capable of recording optically
JPS62229534A (en) * 1986-03-31 1987-10-08 Hitachi Ltd Tracking system
JP2515735B2 (en) * 1986-03-31 1996-07-10 株式会社日立製作所 Optical disc master cutting method
EP0270118A2 (en) * 1986-12-03 1988-06-08 Fujitsu Limited Apparatus for recording and reading an optical disc, having reduced offset in its tracking error signal
JPH07302428A (en) * 1995-05-17 1995-11-14 Hitachi Ltd Tracking method
US6407967B1 (en) 1998-06-10 2002-06-18 Fujitsu Limited Optical apparatus, tracking apparatus and optical disk apparatus
US6556520B1 (en) 1998-08-29 2003-04-29 Samsung Electronics Co., Ltd. Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecting tracking error, and method of detecting tilt error
US6556521B1 (en) 1998-08-29 2003-04-29 Samsung Electronics Co., Ltd. Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecting tracking error, and method of detecting tilt error
US7110334B2 (en) 1998-08-29 2006-09-19 Samsung Electronics Co., Ltd. Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecting tracking error, and method of detecting tilt error
US7167424B2 (en) 1998-08-29 2007-01-23 Samsung Electronics Co., Ltd. Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecting tracking error, and method of detecting tilt error
US7319643B2 (en) 1998-08-29 2008-01-15 Samsung Electronics Co., Ltd. Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecting tracking error, and method of detecting tilt error
US7590034B2 (en) 1998-08-29 2009-09-15 Samsung Electronics Co., Ltd. Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecting tracking error, and method of detecting tilt error
US6549493B1 (en) 1998-09-14 2003-04-15 Matsushita Electric Industrial Co., Ltd. Tilt detection device, optical disc device, and tilt control method
US6674707B2 (en) 2000-01-17 2004-01-06 Matsushita Electric Industrial Co., Ltd. Digital recorded data reproducing device
US8780683B2 (en) 2011-04-11 2014-07-15 Panasonic Corporation Information recording medium, tracking method, and optical information apparatus

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