JPH0756694B2 - Optical information recording / reproducing method - Google Patents
Optical information recording / reproducing methodInfo
- Publication number
- JPH0756694B2 JPH0756694B2 JP58230104A JP23010483A JPH0756694B2 JP H0756694 B2 JPH0756694 B2 JP H0756694B2 JP 58230104 A JP58230104 A JP 58230104A JP 23010483 A JP23010483 A JP 23010483A JP H0756694 B2 JPH0756694 B2 JP H0756694B2
- Authority
- JP
- Japan
- Prior art keywords
- sector
- recording
- information
- sector address
- error correction
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1816—Testing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
-
- 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
- G11B27/3027—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 used signal is digitally coded
-
- 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
- G11B27/36—Monitoring, i.e. supervising the progress of recording or reproducing
-
- 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
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、光学的に検知可能な案内トラックを有し、か
つ案内トラックが複数のセクタに分割されている光記録
ディスクに、情報を記録再生する光情報記録再生方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records and reproduces information on an optical recording disk having an optically detectable guide track, and the guide track is divided into a plurality of sectors. The present invention relates to an optical information recording / reproducing method.
従来例の構成とその問題点 光学的情報記録再生装置としては、例えば光感応性材料
を塗布または蒸着した光記録ディスクを回転させてお
き、ディスク面上にレーザー光源からの光束を直径１μ
ｍ以下に絞った微小スポット光を照射し、その光出力強
度を記録信号で変調することによって、光記録ディスク
上に凸凹による位相変化、あるいは反射率，透過率変化
などの光学的変化としてリアルタイムでビデオ信号やデ
ジタル信号等の情報記録が行なえ、かつ前記光学的特性
変化を検出することにより記録した情報を再生できる装
置がある。Configuration of Conventional Example and Problems Thereof As an optical information recording / reproducing apparatus, for example, an optical recording disk coated or vapor-deposited with a photosensitive material is rotated, and a light beam from a laser light source has a diameter of 1 μm on the disk surface.
By irradiating a minute spot light focused to m or less and modulating the optical output intensity with a recording signal, phase changes due to unevenness on the optical recording disk, or optical changes such as reflectance and transmittance changes in real time are performed. There is a device capable of recording information such as a video signal and a digital signal and reproducing the recorded information by detecting the change in the optical characteristics.
かかる装置では記録トラックの高密度化，離散的な部分
書き込み，消去などの理由から、記録しようとするトラ
ックに光学的に検知可能な案内トラックを同心円状ある
いはスパイラル状に予め設けておき、レーザーによる微
小スポット光が前記案内トラックに追従するように公知
のトラッキング制御をかけて、定められたトラックに情
報を記録し、またそのトラックから情報を再生する光学
的情報記録再生装置が考えられる。In such a device, an optically detectable guide track is preliminarily provided in a concentric or spiral shape on the track to be recorded for reasons such as high density recording tracks, discrete partial writing, and erasing. An optical information recording / reproducing apparatus is conceivable in which known tracking control is performed so that the minute spot light follows the guide track, information is recorded on a predetermined track, and information is reproduced from the track.
データの長さが可変のデジタル情報を記録しようとする
場合、記録領域を効率よく利用するために、トラックを
複数の領域（セクタ）に分割し、セクタ単位で情報の記
録再生を行なっているものがある。この場合、各セクタ
の先頭にはセクタを識別するためのセクタアドレスを予
め設けておき、セクタ単位での情報記録再生は、このセ
クタアドレスを検出して目標のセクタを見つけ、情報を
記録、もしくは再生する。When recording digital information with variable data length, the track is divided into multiple areas (sectors) and the information is recorded / reproduced in sector units in order to use the recording area efficiently. There is. In this case, a sector address for identifying the sector is provided in advance at the beginning of each sector, and information recording / reproduction in sector units detects this sector address to find the target sector and records or Reproduce.
第１図に、光記録ディスクのディスクフォーマットの一
例を示す。FIG. 1 shows an example of a disc format of an optical recording disc.
光記録ディスク１は、複数のセクタS1〜SNから構成され
ており、各セクタはトラック番号と、セクタ番号を書き
込んだセクタアドレス２と、情報記録領域３から成って
いる。情報を記録あるいは再生する際には、セクタアド
レス２を読み取り、希望するセクタを見つけた後、記録
あるいは再生状態とする。The optical recording disk 1 is composed of a plurality of sectors S 1 to S N , and each sector is composed of a track number, a sector address 2 in which the sector number is written, and an information recording area 3. When recording or reproducing information, the sector address 2 is read, the desired sector is found, and then the recording or reproducing state is set.
一方、光記録ディスクの記録ドット長及びトラックピッ
チは１μｍ程度のため、光記録ディスクの製造工程（案
内トラックの形成，レプリカディスクの製造，記録材料
の蒸着，保護層の形成）あるいは光記録ディスクの使用
環境によって、各種の欠陥，ゴミ，キズが生じ、再生信
号のドロップアウトとなる。このようなドロップアウト
がセクタアドレス部に存在すると、セクタアドレスの読
み取りが不能となり、希望するセクタを見つけることが
できない。また、ドロップアウトの大きさ，位置などに
より、場合によってはセクタアドレスが読めたり読めな
かったりするとがあり、読み取りの不安定な状態が起こ
り得る。このような場合、記録しようとするセクタのア
ドレスがたまたま読むことができ、そのセクタに情報を
記録してしまうと、再生する際にセクタアドレスを検出
できずに、再生不能となってしまうことがある。On the other hand, since the recording dot length and track pitch of the optical recording disk are about 1 μm, the manufacturing process of the optical recording disk (formation of guide track, replica disk, vapor deposition of recording material, formation of protective layer) or optical recording disk Depending on the usage environment, various defects, dust, and scratches will occur, resulting in playback signal dropouts. If such a dropout exists in the sector address part, the sector address cannot be read and the desired sector cannot be found. Further, depending on the size and position of the dropout, the sector address may or may not be readable depending on the case, and an unstable reading may occur. In such a case, the address of the sector to be recorded happens to be readable, and if the information is recorded in that sector, the sector address cannot be detected during reproduction and reproduction becomes impossible. is there.
発明の目的 本発明は、セクタ構造をとる光記録ディスクにおいて、
セクタアドレス部にドロップアウトが存在し、セクタア
ドレスの読み取りが不安定なセクタには情報を記録せ
ず、記録したセクタのセクタアドレスは必ず読み出せる
ような光情報記録再生方法を提供することを目的とす
る。An object of the present invention is to provide an optical recording disk having a sector structure,
An object of the present invention is to provide an optical information recording / reproducing method in which information is not recorded in a sector where a sector address has a dropout and reading of the sector address is unstable, and the sector address of the recorded sector can be always read. And
発明の構成 本発明は、セクタアドレスの検出条件を記録時と再生時
で変え、再生時にはセクタアドレスの検出確率が最も高
くなるように設定した最適条件でセクタアドレスを読み
取り、記録時はセクタアドレスの検出確率が最適条件で
検出した時より低くなる第２の検出条件でセクタアドレ
スを読み取るようにすることにより、セクタアドレス読
み取り不安定なセクタはスキップして記録しないように
したものである。According to the present invention, the sector address detection condition is changed between recording and reproduction, the sector address is read under the optimum condition set so that the detection probability of the sector address is maximized during reproduction, and the sector address is detected during recording. By reading the sector address under the second detection condition in which the detection probability is lower than that under the optimum condition, the sector in which sector address reading is unstable is skipped and not recorded.
実施例の説明 以下、図面に従い本発明の実施例について説明する。Description of Embodiments Embodiments of the present invention will be described below with reference to the drawings.
第２図は本発明方法を用いた第１の実施例におけるセク
タアドレス検出回路のブロック図を示すものである。FIG. 2 shows a block diagram of the sector address detection circuit in the first embodiment using the method of the present invention.
再生信号４はコンパレートレベル設定部５からのコンパ
レートレベルに従って２値化コンパレータ６で２値化再
生信号７となり、セクタアドレス検出部８でアドレスを
読み取り、セクタアドレス信号９が出力される。この時
コンパレートレベルは記録時と再生時でレベルを変化さ
せ、記録時コンパレートレベル10,再生時コンパレート
レベル11を用いて、それぞれ２値化している。The reproduced signal 4 becomes a binarized reproduced signal 7 by the binarizing comparator 6 according to the comparator level from the comparator level setting section 5, the sector address detecting section 8 reads the address, and the sector address signal 9 is output. At this time, the comparator level is changed between recording and reproducing, and is binarized using the recording comparator level 10 and the reproducing comparator level 11.
第３図は再生信号のアドレス部と、コンパレートレベル
の状態を示すものである。FIG. 3 shows the address portion of the reproduced signal and the state of the comparison level.
再生時コンパレートレベル11は再生信号アドレス部の中
間部、つまり２値化するのに最適なレベルに設定してお
く。この時、再生信号のアドレス部に図に示すようなド
ロップアウトが存在していると、装置使用条件による、
再生信号レベル変化、あるいはコンパレートレベル変化
によって、セクタアドレス読み取りに誤りが生じ、読め
なくなることがある。そのため、記録時には記録時コン
パレートレベルを最適レベルから上方または下方に偏移
させて設定することにより、ドロップアウトによってセ
クタアドレスの読み取りが不安定の時は、セクタアドレ
スエラーとし、そのセクタをスキップして、情報を書か
ないようにしておく。The reproducing comparator level 11 is set to an intermediate portion of the reproduced signal address portion, that is, an optimum level for binarization. At this time, if there is a dropout as shown in the figure in the address part of the playback signal, it may be
Due to a change in the reproduction signal level or a change in the comparator level, an error may occur in reading the sector address, making it unreadable. Therefore, when recording, by setting the recording compare level by shifting it upward or downward from the optimum level, if reading of the sector address is unstable due to dropout, a sector address error is generated and the sector is skipped. Be careful not to write information.
すなわち、情報を記録する際には、セクタアドレスの検
出確率が低くなるようにコンパレータレベルを上方また
は下方に偏移した条件のもとでセクタアドレスを検出
し、セクタアドレス中のドロップアウトを見つけて、そ
このセクタには情報を記録しないこととする。さらに再
生時には、検出確率が最も高くなるようにコンパレータ
レベルをセクタアドレスの再生信号の振幅の中間値にし
て、情報の記録されたセクタのアドレスは必ず検出でき
るようにする。That is, when recording information, the sector address is detected under the condition that the comparator level is shifted upward or downward so that the detection probability of the sector address becomes low, and the dropout in the sector address is detected. , Information shall not be recorded in that sector. Further, at the time of reproduction, the comparator level is set to the intermediate value of the amplitude of the reproduction signal of the sector address so that the detection probability becomes the highest so that the address of the sector in which information is recorded can be detected without fail.
第４図は本発明の第２の実施例におけるセクタアドレス
検出部のブロック図である。FIG. 4 is a block diagram of a sector address detecting unit in the second embodiment of the present invention.
この場合のセクタアドレス部には、エラー訂正符号が付
加され、エラーがあってもある程度訂正できるものとす
る。再生信号４は、２値化コンパレートレベル設定部12
からのコンパレートレベル13で２値化され、２値化再生
信号７となる。さらにこの２値化再生信号は、再生時に
はアドレス部のエラー訂正回路14を通って、エラーがあ
れば訂正されて、セクタアドレス検出部８へ送られる。
しかし記録時にはエラー訂正回路14を通らず、直接セク
タアドレス検出部８へ送られるようにしている。In this case, an error correction code is added to the sector address part so that even if there is an error, it can be corrected to some extent. The reproduction signal 4 is supplied to the binary comparison level setting unit 12
Is binarized at the comparison level 13 from the above to become the binarized reproduction signal 7. Further, this binarized reproduction signal passes through the error correction circuit 14 in the address section during reproduction, is corrected if there is an error, and is sent to the sector address detection section 8.
However, at the time of recording, the data is sent directly to the sector address detection unit 8 without passing through the error correction circuit 14.
このようにすれば、セクタアドレス部に誤りが起これ
ば、記録時にはそのセクタをスキップするので、記録さ
れたセクタのセクタアドレスは必ず検出できる。また、
読み取りの不安定なセクタアドレス部で、記録時にたま
たま読めて、情報を記録してしまった場合でも、再生時
は、エラー訂正をするため、再生可能となる。In this way, if an error occurs in the sector address part, the sector is skipped during recording, so the sector address of the recorded sector can be detected without fail. Also,
Even if the information is accidentally read at the time of recording and the information is recorded at the sector address portion where reading is unstable, error correction is performed at the time of reproduction, and therefore reproduction becomes possible.
発明の効果 以上述べたように、本発明の光情報記録再生方法は、セ
クタアドレスの検出条件を、再生状態では、セクタアド
レスの検出確率が最も高くなるように設定した最適条件
とし、記録状態では再生状態よりセクタアドレスの検出
確率が低くなるように設定した第２の検出条件とするこ
とによって、セクタアドレス読みとりの不安定なセクタ
をスキップして記録し、かつ記録されたセクタのセクタ
アドレスは必ず読み出すことができるので、セクタアド
レス読み出し不能による再生エラーを防止する効果があ
る。EFFECTS OF THE INVENTION As described above, in the optical information recording / reproducing method of the present invention, the sector address detection condition is set to the optimum condition set so that the sector address detection probability is highest in the reproduction state, and in the recording state. By setting the second detection condition set so that the detection probability of the sector address is lower than that in the reproducing state, the sector in which the sector address is unstable is skipped and recorded, and the sector address of the recorded sector is always Since the data can be read, there is an effect of preventing a reproduction error due to the inability to read the sector address.
第１図はディスクのフォーマットを示す平面図、第２図
は本発明方法を用いた第１の実施例におけるセクタアド
レス検出回路のブロック図、第３図は再生信号と２値化
コンパレータレベルを示す波形図、第４図は本発明方法
を用いた第２の実施例におけるセクタアドレス検出回路
のブロック図である。 ５……コンパレートレベル設定部、６……２値化コンパ
レータ、８……セクタアドレス検出部。FIG. 1 is a plan view showing the format of a disc, FIG. 2 is a block diagram of a sector address detecting circuit in the first embodiment using the method of the present invention, and FIG. 3 shows a reproduced signal and a binary comparator level. FIG. 4 is a block diagram of the sector address detection circuit in the second embodiment using the method of the present invention. 5 ... Comparison level setting unit, 6 ... Binary comparator, 8 ... Sector address detecting unit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 一之瀬 亮 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 杉村 立夫 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 福島 能久 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (56)参考文献 特開 昭53−19014（ＪＰ，Ａ) 特開 昭50−148038（ＪＰ，Ａ) 特開 昭58−45628（ＪＰ，Ａ) 特公 昭53−16686（ＪＰ，Ｂ１) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryo Ichinose 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Tatsuo Sugimura, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Norihisa Fukushima 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP 53-19014 (JP, A) JP 50-148038 (JP, A) JP Sho 58-45628 (JP, A) Japanese Patent Sho 53-16686 (JP, B1)
Claims (2)
前記案内トラックが複数のセクタに分割され、前記各セ
クタごとに誤り訂正符号が付加されたセクタ識別信号が
予め設けられている光記録ディスクを用いる光情報記録
再生方法であって、 情報の記録時には前記誤り訂正符号による誤り訂正処理
が実行されないセクタ識別信号をセクタアドレス信号と
し、情報の再生時には前記誤り訂正符号による誤り訂正
処理が実行されたセクタ識別信号をセクタアドレス信号
とすることを特徴する光情報記録再生方法。1. A guide track which is optically detectable,
An optical information recording / reproducing method using an optical recording disk in which the guide track is divided into a plurality of sectors, and a sector identification signal to which an error correction code is added is provided in advance for each sector. The sector identification signal not subjected to the error correction processing by the error correction code is used as a sector address signal, and the sector identification signal subjected to the error correction processing by the error correction code is used as a sector address signal when reproducing information. Information recording / playback method.
レベルを、情報の記録時には上方または下方に偏移させ
てセクタ識別信号を検出することを特徴する特許請求の
範囲第１項記載の光情報記録再生方法。2. A light according to claim 1, wherein a sector identification signal is detected by shifting a binarized comparator level used during reproduction of information upward or downward during recording of information. Information recording / playback method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58230104A JPH0756694B2 (en) | 1983-12-06 | 1983-12-06 | Optical information recording / reproducing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58230104A JPH0756694B2 (en) | 1983-12-06 | 1983-12-06 | Optical information recording / reproducing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60121534A JPS60121534A (en) | 1985-06-29 |
| JPH0756694B2 true JPH0756694B2 (en) | 1995-06-14 |
Family
ID=16902616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58230104A Expired - Lifetime JPH0756694B2 (en) | 1983-12-06 | 1983-12-06 | Optical information recording / reproducing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0756694B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4695993A (en) * | 1984-06-15 | 1987-09-22 | Matsushita Electric Industrial Co., Ltd. | Optical information recording and reproducing apparatus and optical disc |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50148038A (en) * | 1974-05-20 | 1975-11-27 | ||
| JPS5316686A (en) * | 1976-07-07 | 1978-02-15 | Ricoh Watch | Method of quantitative analysis of metallic ruthenium |
| JPS5319014A (en) * | 1976-08-04 | 1978-02-21 | Fujitsu Ltd | Magnetically recording and reproducing system |
-
1983
- 1983-12-06 JP JP58230104A patent/JPH0756694B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60121534A (en) | 1985-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0072704B1 (en) | Method and apparatus for optically recording and reproducing information | |
| KR100615999B1 (en) | Record carrier, playback device and method of recording information | |
| EP0077643B1 (en) | Optical memory system providing improved focusing control | |
| JPH0670860B2 (en) | Pre-formatted optical media for use in optical memory systems | |
| EP1139338A3 (en) | Optical disk and method and apparatus for recording and then playing information back from that disc | |
| US4821251A (en) | Method and apparatus for recording or reproducing information in or from only a sector of an optical disk track without any defect by shifting a light beam to an adjacent track before a defective sector | |
| EP0082716A1 (en) | Methods of preformatting an optical disk | |
| US4742507A (en) | Optical information recording and reproducing apparatus having defective-sector marking means | |
| JPH0343693B2 (en) | ||
| JPH0687308B2 (en) | Optical disc and optical disc device | |
| JP2801495B2 (en) | Optical recording / reproducing device | |
| JP2568503B2 (en) | Optical disk address recovery circuit | |
| JPS631666B2 (en) | ||
| JPH0689452A (en) | Optical disk device | |
| JPH0154778B2 (en) | ||
| JPH0756694B2 (en) | Optical information recording / reproducing method | |
| JP2809479B2 (en) | Data recording / reproducing device | |
| KR100717651B1 (en) | Reproduction-only recording medium | |
| JPS60121575A (en) | Optical information recording and reproducting device | |
| JPS61145763A (en) | Optical disk device | |
| EP0668588B1 (en) | Recorded signal detection apparatus | |
| JPH0772942B2 (en) | Optical disk device | |
| JPH0330926B2 (en) | ||
| JPH0799585B2 (en) | Optical information recording / reproducing device | |
| JPH0668840B2 (en) | Delete pulse recording method |