JPH0466074B2 - - Google Patents

Info

Publication number
JPH0466074B2
JPH0466074B2 JP22240583A JP22240583A JPH0466074B2 JP H0466074 B2 JPH0466074 B2 JP H0466074B2 JP 22240583 A JP22240583 A JP 22240583A JP 22240583 A JP22240583 A JP 22240583A JP H0466074 B2 JPH0466074 B2 JP H0466074B2
Authority
JP
Japan
Prior art keywords
sector
recording
signal
high level
address
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
Application number
JP22240583A
Other languages
Japanese (ja)
Other versions
JPS60115074A (en
Inventor
Akira Ichinose
Isao Sato
Tatsuo Sugimura
Yuzuru Kuroki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP58222405A priority Critical patent/JPS60115074A/en
Priority to US06/673,620 priority patent/US4768181A/en
Priority to DE8484114179T priority patent/DE3485389D1/en
Priority to EP84114179A priority patent/EP0149755B1/en
Priority to KR1019840007364A priority patent/KR900006674B1/en
Publication of JPS60115074A publication Critical patent/JPS60115074A/en
Publication of JPH0466074B2 publication Critical patent/JPH0466074B2/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
    • 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
    • G11B20/1883—Methods for assignment of alternate areas for defective areas
    • 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
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/013—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track for discrete information, i.e. where each information unit is stored in a distinct discrete location, e.g. digital information formats within a data block or sector
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To decide easily between a defective record sector and an unrecorded sector by performing the overlap writing only at a part of the record signals of the defective record sector and inhibiting the reproduction for said overlap written part. CONSTITUTION:A sector address reproduction circuit 4 reproduces a sector address from an optical detection reproduced signal. When said reproduction address is accordant with the address of a target defective record sector which is going to destruct a part of data, the output of a comparator 5 is set at a high level. This high level output is processed by an AND gate 10 together with an output of a high level produced by an inverter 9 and a timer 6 which starts its operation synchronously with detection of address of the reproduction signal, an output of a high level obtained by a timer 7 which starts in the same way as the timer 6 and a command output of a high level. Thus an overlap writing indication signal is produced by the power light of a fixed high level. The defective record sector is overlap written just partially and this written part is incapable of reproduction. Thus a defective record sector can be easily and accurately to discriminate from a reproduction unable sector.

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ツクを
有し、かつ案内トラツクがあらかじめ複数のセク
タに分割されている光記録デイスクに情報を記録
し、再生する光情報記録再生装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for recording information on an optical recording disk having an optically detectable guide track and in which the guide track is divided in advance into a plurality of sectors. The present invention relates to an optical information recording and reproducing device for reproducing.

従来例の構成とその問題点 高密度大容量メモリとして有望視されている光
記録デイスクメモリは光記録デイスクの低いエラ
ーレイトを克服するためのエラー制御技術が非常
に大切である。Conventional configurations and their problems For optical recording disk memories that are considered promising as high-density, large-capacity memories, error control technology is extremely important to overcome the low error rate of optical recording disks.

光記録デイスクは高トラツク密度化のために案
内溝のような光学的に検知可能な案内トラツクが
もうけられるのが普通で、この案内トラツク上に
形成した記録層に1μｍぐらいに絞つたレーザ光
を照射し、穴あけもしくは、反射率変化を起こし
て記録する。 Optical recording disks usually have optically detectable guide tracks such as guide grooves to achieve high track density, and a laser beam focused to about 1 μm is applied to the recording layer formed on the guide tracks. Irradiate it, make a hole, or cause a change in reflectance and record it.

記録ドツト及びトラツクピツチは、1μｍ程度
であるため、光記録デイスクの製造工程−案内ト
ラツクの形成、レプリカデイスクの製造、記録材
料の蒸着、保護層の形成−あるいは光記録デイス
クの使用環境などによつて各種の欠陥、ゴミ、キ
ズが生じて再生信号のドロツプアウトとなる。こ
のドロツプアウトは多岐にわたり、バースト状の
もの、ランダムなものが同程度生起する。この結
果、光記録デイスクの生のエラーレイトは、10-4
〜10-6と言われており、従来の代表的な記録媒体
である磁気デイスクの10-9〜10-12という生のエ
ラーレイトに比較して非常に悪いのが現状であ
る。 Since the recording dots and track pitches are approximately 1 μm, they may vary depending on the manufacturing process of the optical recording disk - formation of guide tracks, manufacture of replica disks, deposition of recording material, formation of the protective layer - or the environment in which the optical recording disk is used. Various defects, dust, and scratches occur, resulting in a dropout of the playback signal. These dropouts vary widely, with burst-like and random dropouts occurring to the same degree. As a result, the raw error rate of an optical recording disk is 10 -4
The error rate is said to be ~10 -6 , which is currently much worse than the raw error rate of 10 -9 to 10 -12 for magnetic disks, which are typical conventional recording media.

このため光記録デイスクを用いた光情報記録再
生装置は、強力なエラー制御をもつのが普通であ
る。 For this reason, optical information recording and reproducing devices using optical recording disks usually have strong error control.

第１図は、実際に光記録デイスクに記録される
信号のフオーマツトの詳細を示す図である。１は
データ再生時のクロツク同期引込を促すための同
期信号、２はデータの始まりを示すために、一定
のコードを用いたデータマーク、３は誤り訂正符
号理論に基いて、冗長ビツトを付加され、インタ
ーリーブされた符号化データである。この同期信
号１、データマーク２、符号化データ３からなる
記録信号ブロツクは、第２図のＢに示すように、
アドレス部Ａで分割されたセクタに記録される。
アドレス部Ａは、一般にトラツクアドレスとセク
タアドレスが記録されている。 FIG. 1 is a diagram showing details of the format of a signal actually recorded on an optical recording disk. 1 is a synchronization signal to encourage clock synchronization during data reproduction, 2 is a data mark using a certain code to indicate the start of data, and 3 is a data mark with redundant bits added based on the error correction code theory. , is interleaved encoded data. The recording signal block consisting of the synchronization signal 1, data mark 2, and encoded data 3 is as shown in B in FIG.
It is recorded in sectors divided by address part A.
Address portion A generally records track addresses and sector addresses.

光記録デイスクには、一般に記録再生信号のエ
ンベロープを減少させ、復調エラーを発生させる
ドロツプアウトが存在する。このドロツプアウト
が、誤り訂正符号の能力を越えて発生すると、復
調時にエラーが訂正しきれない。 Optical recording disks generally have dropouts that reduce the envelope of recorded and reproduced signals and cause demodulation errors. If this dropout occurs beyond the capacity of the error correction code, the error cannot be corrected during demodulation.

書き換え不能のデイスクの場合、あるセクタに
データを記録した後、そのセクタのデータを読出
して、復調エラーが訂正しきれないと判定された
時に、そのデータが誤つて再生されないようにす
る必要がある。これは、書き換え可能のデイスク
の場合のように、デイレクトリの書き換え等の手
段により、記録セクタの管理情報を書き換えるこ
とができないためである。 In the case of non-rewritable disks, after data is recorded in a certain sector, it is necessary to read the data in that sector to prevent the data from being erroneously reproduced when it is determined that the demodulation error has not been completely corrected. . This is because, unlike in the case of a rewritable disk, the management information of the recording sector cannot be rewritten by means such as rewriting the directory.

そこで、書き換え不能デイスクの場合には、復
調エラーが訂正できないと判定されたセクタに重
ね書きを行なつて、記録信号が検出されないよう
にする手法が用いられる。例えば、光記録デイス
クの場合には、強い一定パワーの光を記録不良セ
クタ全体に照射することにより、記録したデータ
が再生されないようにすることができる。 Therefore, in the case of a non-rewritable disk, a method is used in which sectors in which it has been determined that demodulation errors cannot be corrected are overwritten to prevent recording signals from being detected. For example, in the case of an optical recording disk, recorded data can be prevented from being reproduced by irradiating the entire bad sector with strong light of constant power.

しかしながら、このような重ね書きを行なう
と、再生信号からは、重ね書き後のセクタと未記
録セクタの区別がつかなくなる。 However, when such overwriting is performed, it becomes impossible to distinguish between overwritten sectors and unrecorded sectors from the reproduced signal.

発明の目的 本発明は、光記録デイスク等の書き換え不能の
デイスクにおいて、重ね書き後のセクタと未記録
セクタと記録済セクタとの区別が容易に判定でき
る光情報記録再生装置を提供することを目的とす
る。Purpose of the Invention An object of the present invention is to provide an optical information recording and reproducing device that can easily distinguish between overwritten sectors, unrecorded sectors, and recorded sectors in non-rewritable disks such as optical recording disks. shall be.

発明の構成 本発明は、記録不良セクタが検出された時、記
録不良セクタの記録された信号の一部のみに重ね
書きを行なつて、記録信号の一部が再生されなく
なるようにすることにより、記録不良セクタと未
記録セクタと記録済セクタとの区別が容易に判定
できるようにした光情報記録再生装置である。Composition of the Invention The present invention, when a recording defective sector is detected, overwrites only a part of the signal recorded in the recording defective sector so that a part of the recorded signal cannot be reproduced. , is an optical information recording/reproducing apparatus that can easily distinguish between defective sectors, unrecorded sectors, and recorded sectors.

実施例の説明 第３図は、本発明における一実施例の記録不良
セクタのデータを一部重ね書きする装置のブロツ
ク図を示す。また、第４図は、第３図の各部の信
号のタイミングチヤートである。図において、４
は再生信号に含まれるアドレス部からセクタアド
レスを再生する回路である。５は記録されたデー
タの一部を破壊しようとしている目標のセクタア
ドレスと現在再生しているセクタアドレスを比較
して、一致している時のみハイレベルとなるよう
な信号ｆを出力するコンパレータである。６はア
ドレス部Ａの終了から期間T1の間ハイレベルを
保つタイマＡである。７はアドレス部Ａの終了か
ら期間T2の間ハイレベルを保つタイマＢである。
９はインバータ、１０は４入力の論理積ゲートで
ある。なおタイマＡ６、タイマＢ７は、再生信号
からアドレス部Ａを検出する回路（図示せず）に
より検出された信号によりトリガされる。論理積
ゲート１０は、インバータ９の出力、タイマＢ７
の出力、コンパレータ５の出力および消去指令信
号ｅの論理積により信号ｇを出力する。このよう
にして作られた信号ｇに基いて、信号ｇがハイレ
ベルの時に、強い一定パワーの光を照射すること
により、記録不良セクタのデータを一部重ね書き
することができる。DESCRIPTION OF EMBODIMENTS FIG. 3 is a block diagram of an apparatus for partially overwriting data in a defective sector according to an embodiment of the present invention. Moreover, FIG. 4 is a timing chart of signals of each part in FIG. 3. In the figure, 4
is a circuit that reproduces a sector address from an address part included in a reproduced signal. 5 is a comparator that compares the sector address of the target whose part of the recorded data is to be destroyed with the sector address currently being reproduced, and outputs a signal f that becomes high level only when they match. be. Reference numeral 6 denotes a timer A that maintains the high level for a period T1 from the end of the address section A. A timer B 7 maintains a high level for a period T2 from the end of the address section A.
9 is an inverter, and 10 is a 4-input AND gate. Note that timer A6 and timer B7 are triggered by a signal detected by a circuit (not shown) that detects address portion A from a reproduced signal. AND gate 10 connects the output of inverter 9 and timer B7.
, the output of the comparator 5, and the erase command signal e to output a signal g. Based on the signal g generated in this way, when the signal g is at a high level, by irradiating light with a strong constant power, it is possible to partially overwrite the data in the recording defective sector.

次に、このようにして、記録不良のため信号の
一部が重ね書きされたセクタを、記録良好セクタ
や未記録セクタと区別する手段を示す。 Next, a method for distinguishing a sector in which a part of a signal has been overwritten due to recording failure from a good recording sector or an unrecorded sector will be described.

第５図は、本発明における一実施例のセクタの
記録状態判別のための装置を示すブロツク図であ
る。 FIG. 5 is a block diagram showing an apparatus for determining the recording state of a sector according to an embodiment of the present invention.

また、第６図は、第５図の各部の信号のタイミ
ングチヤートを示す。 Further, FIG. 6 shows a timing chart of signals of each part in FIG. 5.

第３図、第４図と同じ番号、記号のものは同一
のものを示す。１１は再生信号のアドレス部Ａの
終了から期間T3経過後にサンプルパルスを作る
ためのタイマＣである。１２は再生信号のアドレ
ス部Ａの終了から期間T4経過後にサンプルパル
スを作るためのタイマＤである。１３は再生信号
の低周波成分を確実に抑圧する高域通過フイルタ
で、１４は高域通過フイルタ１３の出力の包絡線
を検波する回路である。１５，１６はそれぞれ２
入力の論理積ゲートであり、コンパレータ５の出
力ｆがハイレベルのときのみ、タイマＣ，Ｄの出
力パルスｈ，ｉをそれぞれ１７のサンプルホール
ド回路Ａのサンプルパルスｋおよび１８のサンプ
ルホールド回路Ｂのサンプルパルスｍとして供給
する。 The same numbers and symbols as in FIGS. 3 and 4 indicate the same things. Reference numeral 11 denotes a timer C for generating a sample pulse after a period T3 has elapsed from the end of the address part A of the reproduced signal. 12 is a timer D for generating a sample pulse after a period T4 has elapsed from the end of the address part A of the reproduced signal. 13 is a high-pass filter that reliably suppresses low frequency components of the reproduced signal; 14 is a circuit that detects the envelope of the output of the high-pass filter 13; 15 and 16 are each 2
It is an input AND gate, and only when the output f of the comparator 5 is at a high level, the output pulses h and i of timers C and D are input to the sample pulses k of the 17 sample and hold circuits A and the sample pulses of the 18 sample and hold circuits B, respectively. Supplied as sample pulse m.

以上の構成において、時間幅T1，T2，T3，T4
の関係を T1＜T3＜T2 T2＜T4 （ただし、信号ｉのサンプルパルスが符号化デ
ータ３の領域より後にならないこと）と設定すれ
ば、目標セクタアドレスを設定し、目標セクタの
信号が再生されれば、以下のように、目標セクタ
の記録状態を判定できる。 In the above configuration, time widths T 1 , T 2 , T 3 , T 4
By setting the relationship T 1 < T 3 < T 2 T 2 < T 4 (however, the sample pulse of signal i does not come after the area of encoded data 3), the target sector address can be set, and the target sector If the signal is reproduced, the recording state of the target sector can be determined as follows.

(a) 出力ｌ、出力ｎがともにロウレベルのとき
は、未記録セクタである。(a) When both output l and output n are at low level, it is an unrecorded sector.

(b) 出力ｌがロウレベル、出力ｎがハイレベルの
ときは、記録不良のために信号の一部を破壊し
たセクタである。(b) When the output l is low level and the output n is high level, this is a sector in which part of the signal has been destroyed due to a recording defect.

(c) 出力ｌ、出力ｎがともにハイレベルのとき
は、記録良好セクタである。(c) When both output l and output n are at high level, it is a good sector for recording.

以上の実施例は、記録情報の前半の部分に重ね
書きし、記録状態判別時には、重ね書きされる所
に相当する箇所の再生信号の包絡線検波出力を観
測するものであるが、本発明は重ね書きする箇所
を限定するものではない。記録情報の一部が残つ
ていて、それが検出できるのならば、どこを重ね
書きしてもかまわない。 In the embodiments described above, the first half of recorded information is overwritten, and when determining the recording state, the envelope detection output of the reproduced signal corresponding to the overwritten area is observed. It does not limit the parts to be overwritten. As long as part of the recorded information remains and can be detected, it does not matter where it is overwritten.

発明の効果 本発明は以上説明したように、記録不良セクタ
の記録された信号の一部のみに重ね書きを行なう
ようにしたので、記録不良セクタ、未記録セクタ
および記録済セクタの区別を容易に行なうことが
できる。Effects of the Invention As explained above, the present invention overwrites only a part of the recorded signal in a recording defective sector, so that it is easy to distinguish between a recording defective sector, an unrecorded sector, and a recorded sector. can be done.

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

第１図は光記録デイスクに記録される信号のフ
オーマツトを示す図、第２図はセクタのアドレス
部とデータ部の配置を示すタイムチヤート、第３
図は本発明における一実施例の記録データの一部
に重ね書きをするための装置のブロツク図、第４
図は第３図の各部の信号のタイミングチヤート、
第５図は本発明における一実施例のセクタの記録
状態の判別のための装置のブロツク図、第６図は
第５図の各部の信号のタイミングチヤートであ
る。 ４……アドレス再生回路、５……コンパレー
タ、６，７，１１，１２……タイマ、１３……
HPF、１４……包絡線検波回路、１０，１５，
１６……論理積ゲート、１７，１８……サンプル
ホールド回路。 Fig. 1 is a diagram showing the format of a signal recorded on an optical recording disk, Fig. 2 is a time chart showing the arrangement of the address part and data part of a sector, and Fig. 3 is a diagram showing the format of a signal recorded on an optical recording disk.
The figure is a block diagram of a device for overwriting a part of recorded data according to an embodiment of the present invention.
The figure is a timing chart of the signals of each part in Figure 3,
FIG. 5 is a block diagram of an apparatus for determining the recording state of a sector according to an embodiment of the present invention, and FIG. 6 is a timing chart of signals at various parts in FIG. 4... Address reproduction circuit, 5... Comparator, 6, 7, 11, 12... Timer, 13...
HPF, 14... Envelope detection circuit, 10, 15,
16...AND gate, 17, 18...Sample and hold circuit.

Claims (1)

【特許請求の範囲】 １ レーザ光源を変調して情報を光記録デイスク
の指定案内トラツクの所定領域に記録する記録手
段と、前記案内トラツクの信号のエンベロープを
検出するエンベロープ検出手段と、前記案内トラ
ツクの記録済領域に対して、記録不良と判定され
る毎に当該記録済領域の一定領域に前記記録手段
が重ね書きをするための一定パワー光を照射する
ように制御する一定パワー光照射手段とを備え、
記録されるべき領域のうち前記一定領域と前記一
定領域以外の２カ所で前記エンベロープ検出手段
の出力をサンプリングすることにより、記録状態
を判定することを特徴とする光情報記録再生装
置。 ２ エンベロープ検出手段は、重ね書きした領域
の再生信号のエンベロープを抑圧する高域通過フ
イルタを備えることを特徴とする特許請求の範囲
第１項記載の光情報記録再生装置。[Scope of Claims] 1. Recording means for modulating a laser light source to record information in a predetermined area of a designated guide track of an optical recording disk, envelope detection means for detecting an envelope of a signal of the guide track, and an envelope detecting means for detecting an envelope of a signal of the guide track. constant power light irradiation means for controlling the recorded area to irradiate constant power light for the recording means to overwrite a certain area of the recorded area every time a recording is determined to be defective; Equipped with
An optical information recording/reproducing apparatus characterized in that a recording state is determined by sampling the output of the envelope detection means at two locations, the fixed region and the other than the fixed region, of the region to be recorded. 2. The optical information recording and reproducing apparatus according to claim 1, wherein the envelope detecting means includes a high-pass filter that suppresses the envelope of the reproduced signal in the overwritten area.
JP58222405A 1983-11-25 1983-11-25 Recording and reproducing device of optical information Granted JPS60115074A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP58222405A JPS60115074A (en) 1983-11-25 1983-11-25 Recording and reproducing device of optical information
US06/673,620 US4768181A (en) 1983-11-25 1984-11-21 Apparatus for determining defective or non-used sectors of an optical dish
DE8484114179T DE3485389D1 (en) 1983-11-25 1984-11-23 RECORDING AND PLAYBACK DEVICE FOR OPTICAL INFORMATION.
EP84114179A EP0149755B1 (en) 1983-11-25 1984-11-23 Optical information recording and reproducing apparatus
KR1019840007364A KR900006674B1 (en) 1983-11-25 1984-11-23 Recording/reproducing apparatus for optical information

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58222405A JPS60115074A (en) 1983-11-25 1983-11-25 Recording and reproducing device of optical information

Publications (2)

Publication Number Publication Date
JPS60115074A JPS60115074A (en) 1985-06-21
JPH0466074B2 true JPH0466074B2 (en) 1992-10-22

Family

ID=16781858

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58222405A Granted JPS60115074A (en) 1983-11-25 1983-11-25 Recording and reproducing device of optical information

Country Status (1)

Country Link
JP (1) JPS60115074A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62173654A (en) * 1986-01-28 1987-07-30 Matsushita Electric Ind Co Ltd optical record carrier

Also Published As

Publication number Publication date
JPS60115074A (en) 1985-06-21

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