JPS61292228A - Information recording method for optical information recording medium - Google Patents

Information recording method for optical information recording medium

Info

Publication number
JPS61292228A
JPS61292228A JP60133002A JP13300285A JPS61292228A JP S61292228 A JPS61292228 A JP S61292228A JP 60133002 A JP60133002 A JP 60133002A JP 13300285 A JP13300285 A JP 13300285A JP S61292228 A JPS61292228 A JP S61292228A
Authority
JP
Japan
Prior art keywords
information recording
optical information
optical
recording area
beam spot
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
JP60133002A
Other languages
Japanese (ja)
Other versions
JPH0517613B2 (en
Inventor
Bunro Kawaguchi
川口　文朗
Akio Aoki
昭夫 青木
Kazuo Minoura
一雄 箕浦
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP60133002A priority Critical patent/JPS61292228A/en
Publication of JPS61292228A publication Critical patent/JPS61292228A/en
Publication of JPH0517613B2 publication Critical patent/JPH0517613B2/ja
Granted 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
    • G11B7/08—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
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/14—Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To record a signal on two optical information recording areas with the use of an optical system of the 3-beam system by using the 2nd light beam placed at the center to record the signal and scanning a track guide with the 1st light beam in recording the 1st recording area and the 3rd light beam in recording the 2nd information recording area. CONSTITUTION:In writing information to an optical information recording area 1a, a beam spot A-1 is arranged onto a track guide 2, a beam spot A-2 is onto the optical information recording area 1a and a beam spot A-3 is arranged onto an optical information recording area 1b, and the information is written by the beam spot A-2 with a strong beam intensity as a recording pit string 3. In writing the information to the optical information recording area 1b, a beam spot B-3 is arranged onto an adjacent track guide, a beam spot B-2 is onto the optical recording area 1b and a beam spot B-1 is arranged onto the optical recording area 1a, and the beam spot B-2 writes the information to the optical information recording area 1b as a recording pit string 5.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光学的情報記録媒体の情報記録方法に係）、ｑ
＃に隣接するトラックガイド間に第１の光学的情報記録
領域及び第２の光学的情報記録領域とを有する光学的情
報記録媒体の情報記録方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an information recording method on an optical information recording medium), q
The present invention relates to an information recording method for an optical information recording medium having a first optical information recording area and a second optical information recording area between adjacent track guides.

〔従来技術〕[Prior art]

以下、従来の光学的情報記録媒体について図を用いて説
明する。Hereinafter, a conventional optical information recording medium will be explained using figures.

第３図は従来の光学的情報記録媒体の部分拡大図である
。FIG. 3 is a partially enlarged view of a conventional optical information recording medium.

第３図において、２は光学的情報の記録時あるいは再生
時において、トラッキングサーボ、フォーカスサー〆に
用いるトラックガイドで、４はクロック信号再生に用い
るクロックトラックである。In FIG. 3, 2 is a track guide used for tracking servo and focus servo when recording or reproducing optical information, and 4 is a clock track used for clock signal reproduction.

１はトラックガイド２とクロックトラック４との間に設
けられた光学的情報記録領域で、３は光学的情報記録領
域１に形成された光学的記録情報列である。通常トラッ
クガイｒ２及びクロックトラック４は光学的記録情報列
３の形成する前に設け　　□られる。1 is an optical information recording area provided between the track guide 2 and the clock track 4; 3 is an optical recording information string formed in the optical information recording area 1; Usually, the track guide r2 and the clock track 4 are provided before the optical recording information sequence 3 is formed.

次に、上記光学的情報記録媒体の記録方法について述べ
る。Next, a recording method for the optical information recording medium will be described.

第６図は、光学的情報記録再生装置の光学系の概略図で
ある。FIG. 6 is a schematic diagram of the optical system of the optical information recording/reproducing device.

第６図において、！、７．Ｚは、３次元空間座標軸を示
す。尚、２は紙面に垂直な方向の座標軸を示す。レーデ
−光源１４から出た光は、コメリータレンズ６を通って
平行ビームとなシ、回折格子７に入射する。回折格子７
は、Ｘ方向に格子が切られている為に、２方向に光が回
折する、この時光は回折格子７によりｏ次、１次、−１
次の３つの回折光となる。In Figure 6,! ,7. Z indicates a three-dimensional spatial coordinate axis. Note that 2 indicates a coordinate axis in a direction perpendicular to the plane of the paper. The light emitted from the radar light source 14 passes through the commerita lens 6 to become a parallel beam and enters the diffraction grating 7. Diffraction grating 7
Since the grating is cut in the X direction, the light is diffracted in two directions.At this time, the light is diffracted by the diffraction grating 7 into the o-th, 1st-order, -1st order.
This results in the following three diffracted lights.

０次回折光及び±１次の回折光は対物レンズ８によって
光学的情報記録媒体１２に結像され、３つの光ビームス
ポットを形成する。Ｏ次回折光は±１次回折光よシも高
い回折効率を持ち、レーザー光源の変調によって０次回
折光のみがピットを形成する事ができる。光学的情報記
録媒体１２は前記トラックガイド２がＸ方向と平行とな
るように配置されかつ、図中の矢印１３に示したように
Ｘ方向に一定速度で往復して、記録及び再生動作が行わ
れる。光学的情報記録媒体１２からの３つの反射光は、
再び対物レンズ８を通って反射鏡９によシ反射されレン
ズ１０によシ、該レンズ１０の焦点面１１に結像される
。前記焦点面１１には前記３つの反射光を個々に検出す
るための光センサが２方向に配置されている。The 0th-order diffracted light and the ±1st-order diffracted light are imaged onto the optical information recording medium 12 by the objective lens 8 to form three light beam spots. The O-order diffracted light has higher diffraction efficiency than the ±1st-order diffraction light, and only the 0th-order diffracted light can form pits by modulating the laser light source. The optical information recording medium 12 is arranged so that the track guide 2 is parallel to the X direction, and reciprocates in the X direction at a constant speed as shown by the arrow 13 in the figure to perform recording and reproducing operations. be exposed. The three reflected lights from the optical information recording medium 12 are:
The light passes through the objective lens 8 again, is reflected by the reflecting mirror 9, and is focused on the focal plane 11 of the lens 10. On the focal plane 11, optical sensors for individually detecting the three reflected lights are arranged in two directions.

上記光学系を用いて、光学的情報を書き込む場合、第４
図に示すように、３つのビームスポットを配置する。す
なわちビームスポットＡ−１はトラックガイド２上に、
ビームスポットＡ−２は光学的情報記録領域１上に、ビ
ームスボッ）Ａ−３はクロックトラック４上に配置され
る。上記ビームスボッ）Ａ−２によって光学的情報記録
領域１に、光学的情報が光学的記録情報列（以下記録ビ
ット列と呼ぶ）３として書き込まれる。光学的情報を次
の光学的情報記録領域１に書き込む場合は、ビームスプ
ツトＡ−１、Ａ−２、Ａ−３をそれぞれビームスポット
Ｂ−１、Ｂ−２、Ｂ−３の位置まで移動させて、同様に
記録ビット列３を形成する。When writing optical information using the above optical system, the fourth
Three beam spots are arranged as shown in the figure. That is, the beam spot A-1 is on the track guide 2,
The beam spot A-2 is placed on the optical information recording area 1, and the beam spot A-3 is placed on the clock track 4. Optical information is written into the optical information recording area 1 as an optical recording information string (hereinafter referred to as a recording bit string) 3 by the beam subsystem A-2. When writing optical information to the next optical information recording area 1, move beam spots A-1, A-2, and A-3 to the positions of beam spots B-1, B-2, and B-3, respectively. , similarly forms the recording bit string 3.

以上の従来の光学的情報記録媒体においては。In the above conventional optical information recording medium.

光学的情報の書き込みの際、光学的情報記録媒体の移動
速度が均一でなく、加速、減速を繰シ返す等のために書
き込みの際のスピードの均一性に関する信頼性が欠け、
光学的情報記録媒体の光学的情報記録領域にクロック信
号再生に用いるクロックトラックを設ける必要があった
。記録情報量を増加させるニーズに対しては、ある特定
の変調方式を用いれば、クロックトラックを省略して記
録可能であるという事がドレクスラー・テクノロジー社
（米国）のレポートに開示されている。When writing optical information, the moving speed of the optical information recording medium is not uniform, and the speed uniformity during writing is unreliable due to repeated acceleration and deceleration.
It is necessary to provide a clock track for use in clock signal reproduction in the optical information recording area of the optical information recording medium. In response to the need to increase the amount of recorded information, a report by Drexler Technology, Inc. (USA) discloses that by using a certain modulation method, it is possible to record without clock tracks.

本件出願人との機密開示契約に基づいて、前記レポート
の光学的情報記録媒体について記載すると、第５図に示
すように、クロックトラックを除去し、光学的情報記録
領域１ａに記録ビット列３を形成し、光学的情報記録領
域１ｂに記録ピット列５を形成した構造となっている。Based on the confidential disclosure agreement with the applicant, the optical information recording medium in the report is described. As shown in FIG. 5, the clock track is removed and a recording bit string 3 is formed in the optical information recording area 1a. However, it has a structure in which a recording pit row 5 is formed in the optical information recording area 1b.

クラック信号再生は別に設けられるクロック信号発生器
によって行われる。Crack signal reproduction is performed by a separately provided clock signal generator.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかしながら、上記の記録ビット列を２列設け、た光学
的情報記録媒体に訃い゛ては、第４図を用いて説明した
従来の光学的情報記録媒体の情報記録方法では１例しか
記録する事ができず、新して情報記録方法が望まれてい
た。However, in the case of an optical information recording medium in which two recording bit strings are provided as described above, only one example can be recorded using the conventional information recording method of the optical information recording medium explained using FIG. Therefore, a new method of recording information was desired.

〔問題点を解決するための手段〕[Means for solving problems]

上記の従来技術からの要望は隣接するトラックガイド間
に第１の光学的情報記録領域及び第２の光学的情報記録
領域とを有する光学的情報記録媒体の情報記録方法にお
いて、中央の光ビームチｍ報記録を行い、残シの２本の
光ビームの内一方の光ビームでトラッキング及びフォー
カス制御を行う３ビ一ム方式の光学系を用いて、 上記第１の光学的情報記録領域への情報記録には、第１
のトラックガイド上の第１の光ビームによ）、ＡＴ　、
　ＡＦ制御を行い、第１の光学的情報記録領域上の第２
の光ビームによってピットの記録を行い、 上記第２の光学的情報記録領域への情報記録には、上記
３つの光ビームを１段移動させ、第２の光学的情報記録
領域上の第２の光ビームによシＡＴ　、　ＡＦ制御を行
い、第２のトラックガイド上の第３の光ビームとくよっ
てピットの記録を行う事を特徴とする本発明の光学的情
報記録媒体の情報記録方法によって達成される。The above-mentioned demand from the prior art is that in an information recording method for an optical information recording medium having a first optical information recording area and a second optical information recording area between adjacent track guides, a central optical beam beam m Information is recorded in the first optical information recording area using a three-beam optical system that performs tracking and focus control using one of the remaining two light beams. The record includes the first
by the first light beam on the track guide of), AT,
AF control is performed, and the second optical information recording area on the first optical information recording area is
To record information in the second optical information recording area, the three light beams are moved one step and the pits are recorded with a light beam on the second optical information recording area. This is achieved by the information recording method for an optical information recording medium of the present invention, which performs AT and AF control using a light beam, and records pits by combining with a third light beam on a second track guide. be done.

〔実施例〕〔Example〕

以下、図面を用いて本発明の実施例について説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第１図は本発明の光学的情報記録媒体の情報記録方法を
示す説明図である。FIG. 1 is an explanatory diagram showing an information recording method on an optical information recording medium according to the present invention.

第１図において、２は光学的情報の記録時あるいは再生
時において、トラッキングサー？、フォーカスサー？に
用いるトラックガイドで、ｌａ。In FIG. 1, 2 indicates a tracking sensor when recording or reproducing optical information. , focus sir? A track guide used for la.

１ｂはトラックガイド２間に設けられた光学的情報記録
領域である。光学的情報記録領域１ａに情報を記録ピッ
トとして書き込む場合、第１図に示すようにＡ−１、Ａ
−２，Ａ−３の３つのビームスホットを配置する。すな
わち、ビームスポットＡ−１はトラックガイド２上に、
ビームスポットＡ−２は光学的情報記録領域ｌａ上に、
ビームスボッ）Ａ−３は光学的情報記録領域ｌｂ上に配
置される。前述したようにビームスポットＡ−２はビー
ム強度が強く、このビームスボッ）Ａ−２によってのみ
Ｋよって光学的情報記録領域１ａに、情報が記録ピット
列３として書き込まれる。1b is an optical information recording area provided between the track guides 2. When writing information as recording pits in the optical information recording area 1a, as shown in FIG.
Place three beam hots, -2 and A-3. That is, the beam spot A-1 is on the track guide 2,
Beam spot A-2 is on the optical information recording area la,
Beam sub-box A-3 is arranged on the optical information recording area lb. As described above, the beam spot A-2 has a strong beam intensity, and information is written in the optical information recording area 1a as a recording pit row 3 only by this beam spot A-2.

次に光学的情報記録領域１ｂに書き込む場合は。Next, when writing to the optical information recording area 1b.

ビームスポットＡ−１、Ａ−２、Ａ−３をそれぞれビー
ムスポットＢ−１，Ｂ−２，Ｂ−３の位置に移動させる
。ビームスポットＢ−３は隣接するトラックガイド上に
、ビームスポットＢ−２は光学的記録領域ｌｂ上に、ビ
ームスボッ）Ｂ−１は光学的記録領域１＆上に配置され
て、ビームスボッ）Ｂ−２によって光学的情報記録領域
１ｂに情報が記録ピット列５として書き込まれる。Beam spots A-1, A-2, and A-3 are moved to the positions of beam spots B-1, B-2, and B-3, respectively. Beam spot B-3 is placed on the adjacent track guide, beam spot B-2 is placed on the optical recording area lb, beam spot B-1 is placed on the optical recording area 1&, and beam spot B-2 is placed on the optical recording area 1&. Information is written in the optical information recording area 1b as a recording pit array 5.

次に上記光学的情報記録媒体の情報再生方法について説
明する。Next, a method for reproducing information from the optical information recording medium will be explained.

第２図は上記光学的情報記録媒体の情報再生方法を示す
説明図である。FIG. 2 is an explanatory diagram showing a method for reproducing information from the optical information recording medium.

本実施例においては、情報再生効率を向上させる為に、
同時に２列の記録ピット列３，５から２つの情報を再生
する事が可能であ夛、光学系の移動は２段づつ行えるの
で再生スピードを速くする事ができる。In this embodiment, in order to improve information reproduction efficiency,
It is possible to simultaneously reproduce two pieces of information from the two recording pit rows 3 and 5, and since the optical system can be moved two steps at a time, the reproduction speed can be increased.

第２図において、ビームスボッ）Ｃ−１、Ｃ−２、Ｃ−
３の配置においては、ビームスホットＣ−１によシ、ト
ラッキングサーゲ（以下、ＡＴと略す）及びフォーカス
サー♂（以下、ＡＦと略す）が行われ、ビームスボッ）
Ｃ−２及びＣ−３によシ、記録ピットの列の再生が行わ
れる。ビームスポットＤ−１、Ｄ−２、Ｄ−３の配置に
おいては。In Figure 2, beams (beams) C-1, C-2, C-
In the arrangement No. 3, tracking serge (hereinafter abbreviated as AT) and focus surge (hereinafter abbreviated as AF) are performed by beam spot C-1, and beam spotting)
The rows of recorded pits are reproduced by C-2 and C-3. In the arrangement of beam spots D-1, D-2, and D-3.

ビームスポットＤ−３によシ、ＡＴ及びＡＦの制御が行
われ、ビームスボッ）Ｄ−１及びＤ−２によシ、記録ピ
ット列の再生が行われる。ビームスポットＥ−１，Ｅ−
２，Ｅ−３の配置においては、ビームスポットＥ−２に
よシ、ＡＴ及びＡＦの制御が行われ、ビームスボッ）Ｅ
−１及びＥ−３によシ、記録ピット列の再生が行われる
。The AT and AF are controlled by the beam spot D-3, and the recorded pit string is reproduced by the beam spots D-1 and D-2. Beam spot E-1, E-
In the arrangement of 2 and E-3, AT and AF are controlled by beam spot E-2, and beam spot E-2 is used to control AT and AF.
-1 and E-3, the recorded pit string is reproduced.

以上の本発明に用いられる光学的情報記録媒体としては
光カードの他に例えば円盤状の光ディスク等がある。In addition to the optical card, the optical information recording medium used in the present invention includes, for example, a disk-shaped optical disk.

〔発明の効果〕〔Effect of the invention〕

以上、詳細に述べたように、本発明の光学的情報記録媒
体の情報記録方法によれば、従来の中央の光ビーム強度
が両脇の光ビームの強度よシも強い３ビ一ム方式の光学
系を用いて２つの光学的情報記録領域を有する光学的情
報記録媒体に適した情報記録方法を提供する事ができる
。As described above in detail, according to the information recording method of the optical information recording medium of the present invention, the conventional 3-beam system has a central light beam intensity that is stronger than that of the light beams on both sides. It is possible to provide an information recording method suitable for an optical information recording medium having two optical information recording areas using an optical system.

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

第１図は本発明の光学的情報記録媒体の情報記録方法の
説明図である。 第２図は本発明に用いられる光学的情報記録媒体の情報
再生方法の説明図である。 第３図は従来の光学的情報記録媒体の部分拡大図である
。 第４図は従°来の光学的情報記録媒体の情報記録方法の
説明図である。 第５図は本発明に用いられる光学的情報記録媒体の部分
拡大図である。 第６図は光学的情報記録再生装置の光学系の概略図であ
る。 Ｉａ、ｌｂ・・・光学的情報記録領域 ２・・・トラックガイド ３．５・・・光学的記録情報列 代理人　弁理士　　山　下　穣　子 弟１図 Ｎ２図 第３図 ロロロロロロロ 第４図 第５図 Ｉｂ（００（１ｍｉ心５ 第６図 ■FIG. 1 is an explanatory diagram of an information recording method for an optical information recording medium according to the present invention. FIG. 2 is an explanatory diagram of a method for reproducing information from an optical information recording medium used in the present invention. FIG. 3 is a partially enlarged view of a conventional optical information recording medium. FIG. 4 is an explanatory diagram of a conventional information recording method on an optical information recording medium. FIG. 5 is a partially enlarged view of the optical information recording medium used in the present invention. FIG. 6 is a schematic diagram of the optical system of the optical information recording/reproducing device. Ia, lb...Optical information recording area 2...Track guide 3.5...Optical recording information string Agent Patent attorney Jo Yamashita Child 1 figure N2 figure 3 lolololololorolo figure 4 figure 5 Ib(00(1mi heart 5 Figure 6■

Claims (1)

【特許請求の範囲】[Claims] （１）隣接するトラッキング制御及びフォーカス制御用
のトラックガイドの間に、第１の光学的情報記録領域及
び第２の光学的情報記録領域とを有する光学的情報記録
媒体に情報を記録するに際し、前記媒体上に、第１、第
２及び第３の光ビームを投射し、中央に位置する第２の
光ビームで記録を行ない、該第２の光ビームの両側に配
された第１又は第３の光ビームで前記トラックガイドを
走査してトラッキング及びフォーカシング信号を得、前
記第１の光学的情報記録領域を記録する場合は前記第１
の光ビームでトラックガイドを走査し、第２の光学的情
報記録領域を記録する場合は前記第３の光ビームでトラ
ックガイドを走査することを特徴とする光学的情報記録
媒体の情報記録方法。(1) When recording information on an optical information recording medium having a first optical information recording area and a second optical information recording area between adjacent track guides for tracking control and focus control, First, second, and third light beams are projected onto the medium, the second light beam located at the center performs recording, and the first or second light beams located on either side of the second light beam perform recording. In the case where the track guide is scanned with the light beam of No. 3 to obtain a tracking and focusing signal, and the first optical information recording area is recorded, the first optical information recording area is recorded.
A method for recording information on an optical information recording medium, characterized in that a track guide is scanned with a light beam, and when recording a second optical information recording area, the track guide is scanned with a third light beam.
JP60133002A 1985-06-20 1985-06-20 Information recording method for optical information recording medium Granted JPS61292228A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60133002A JPS61292228A (en) 1985-06-20 1985-06-20 Information recording method for optical information recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60133002A JPS61292228A (en) 1985-06-20 1985-06-20 Information recording method for optical information recording medium

Publications (2)

Publication Number Publication Date
JPS61292228A true JPS61292228A (en) 1986-12-23
JPH0517613B2 JPH0517613B2 (en) 1993-03-09

Family

ID=15094486

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60133002A Granted JPS61292228A (en) 1985-06-20 1985-06-20 Information recording method for optical information recording medium

Country Status (1)

Country Link
JP (1) JPS61292228A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0239131A2 (en) * 1986-03-28 1987-09-30 Csk Corporation Tracking method for an optical recording medium
WO1989003577A1 (en) * 1987-10-07 1989-04-20 Kabushiki Kaisha Csk Device for tracking an optical memory card
JPH02149927A (en) * 1988-11-30 1990-06-08 Nec Home Electron Ltd Method for reading information of optical disk
JP2008165927A (en) * 2006-12-28 2008-07-17 Hitachi Ltd Optical disk medium and optical disk drive
JP2010097652A (en) * 2008-10-16 2010-04-30 Konica Minolta Opto Inc Optical pickup apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0239131A2 (en) * 1986-03-28 1987-09-30 Csk Corporation Tracking method for an optical recording medium
WO1989003577A1 (en) * 1987-10-07 1989-04-20 Kabushiki Kaisha Csk Device for tracking an optical memory card
JPH02149927A (en) * 1988-11-30 1990-06-08 Nec Home Electron Ltd Method for reading information of optical disk
JP2008165927A (en) * 2006-12-28 2008-07-17 Hitachi Ltd Optical disk medium and optical disk drive
JP4685754B2 (en) * 2006-12-28 2011-05-18 株式会社日立製作所 Tracking method
JP2010097652A (en) * 2008-10-16 2010-04-30 Konica Minolta Opto Inc Optical pickup apparatus

Also Published As

Publication number Publication date
JPH0517613B2 (en) 1993-03-09

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