JPH01155522A - Method for recording information signal in optical disk - Google Patents
Method for recording information signal in optical diskInfo
- Publication number
- JPH01155522A JPH01155522A JP31450787A JP31450787A JPH01155522A JP H01155522 A JPH01155522 A JP H01155522A JP 31450787 A JP31450787 A JP 31450787A JP 31450787 A JP31450787 A JP 31450787A JP H01155522 A JPH01155522 A JP H01155522A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- optical disk
- area
- optical disc
- recording area
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims description 47
- 230000002093 peripheral effect Effects 0.000 claims abstract 4
- 230000002441 reversible effect Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 229910005900 GeTe Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 241001602876 Nata Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000005387 chalcogenide glass Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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
- G11B7/007—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
Landscapes
- Signal Processing For Digital Recording And Reproducing (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、レーザ光線を用い、非晶質−結晶間、あるい
は結晶−結晶間等の可逆的相変化を生ずる記録層を有す
る光ディスク上に、高密度にディジタル信号を記録する
方式に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention uses a laser beam to record high-density recording on an optical disk having a recording layer that causes a reversible phase change such as between an amorphous and a crystal or between a crystal and a crystal. This invention relates to a method for recording digital signals at high density.
従来の技術
相変化型の光ディスクへの信号記録方式には幾つかの種
類があるが、その記録メカニズムの基本は共通である。Conventional Technology There are several types of signal recording methods on phase change optical disks, but the basic recording mechanism is the same.
すなわち、回転する光ディスクにレーザ光を照射し、レ
ーザ光の照射パワー及び照射時間等をコントロールする
ことにより、記録層の到達温度、冷却速度が変わる。こ
の結果、レーザ光照射部は、冷却過程を経て少なくとも
２種類以上の光学的に区別できる状態をとる。例えば、
ＴｅやＳｅをベースにしたカルコゲナイドガラス薄膜を
用いた場合には、レーザ光の照射によって、照射部を瞬
時溶融させた後急冷することで非晶質状態を、徐冷する
ことで結晶状態を得る。この場合には、非晶質状態の領
域（以下ピット）を形成することで記録を行う。That is, by irradiating a rotating optical disk with a laser beam and controlling the irradiation power, irradiation time, etc. of the laser beam, the temperature reached and the cooling rate of the recording layer are changed. As a result, the laser beam irradiation section assumes at least two types of optically distinguishable states through the cooling process. for example,
When a chalcogenide glass thin film based on Te or Se is used, the irradiated area is instantaneously melted by laser beam irradiation, and then rapidly cooled to obtain an amorphous state, and slow cooling to obtain a crystalline state. . In this case, recording is performed by forming amorphous regions (hereinafter referred to as pits).
従来、光ディスクにディジタル信号を記録する方法、す
なわち変調符号と記録媒体上のピット・とを対応させる
方法としては、ピット間隔変調方式（以下Ｐ Ｐ Ｍ方
式）と、ピット端間隔変調方式（以下ＰＷＭ方式）がよ
く用いられている。Conventionally, methods for recording digital signals on optical discs, that is, methods for associating modulation codes with pits on the recording medium, include the pit interval modulation method (hereinafter referred to as PPM method) and the pit edge interval modulation method (hereinafter referred to as PWM method). method) is often used.
ＰＰＭ方式は、第２図のように概略同一寸法のビットを
列として捕らえ、隣接したビットの間隔に意味をもたせ
ることによりディジタル信号を記録する方式である。The PPM method is a method for recording digital signals by capturing bits of approximately the same size as a string as shown in FIG. 2, and assigning meaning to the intervals between adjacent bits.
ＰＷＭ方式は、第３図のようにビットの長さ及び間隔に
意味をもたせてディジタル信号を記録する方式である。The PWM method is a method for recording digital signals by assigning meaning to the length and interval of bits, as shown in FIG.
ＰＷＭ方式は、ＰＰＭ方式に比べて情報記録密度が約２
倍になるという長所を有する反面、記録再生信号の品質
がビットの形状歪みの影響を受けやすいという短所を有
している。The PWM method has an information recording density of about 2 compared to the PPM method.
Although it has the advantage of being twice as large, it has the disadvantage that the quality of the recording/reproduction signal is susceptible to bit shape distortion.
発明が解決しようとする問題点
上述のように光ディスクにディジタル信号を記録する場
合、記録密度の点からみてＰＷＭ方式によるのが有利で
ある。しかし、相変化型光ディスクにＰＷＭ方式で記録
する場合、レーザ照射部において記録媒体が十分な線速
度で回転していないと、良好な品質の記録再生信号が得
られない場合がある。例えば、１本又は２本の丸く絞り
こまれたレーザ光を用いて、高い結晶化速度を有する非
晶質−結晶間の相変化型光ディスクに重ね書き、あるい
は同時消録、すなわち古い信号を消去しながら、同時に
、その後に新しい信号を記録しようとする場合がそれに
あてはまる。この場合には消去速度を重視することから
、結晶化速度をできるだけ高めた記録層を適用する。線
速度が遅い場合には、レーザスポットの大きさに比べて
何倍も長いビットを、歪みのない形状で形成することが
できない。Problems to be Solved by the Invention When recording digital signals on an optical disk as described above, it is advantageous to use the PWM method in terms of recording density. However, when recording on a phase-change optical disk using the PWM method, if the recording medium is not rotating at a sufficient linear velocity in the laser irradiation section, recording and reproducing signals of good quality may not be obtained. For example, one or two laser beams narrowed into a round shape can be used to overwrite or simultaneously erase old signals on an amorphous-crystalline phase change optical disk that has a high crystallization rate. However, at the same time, this is the case when trying to record a new signal afterwards. In this case, since erasing speed is important, a recording layer with a crystallization speed as high as possible is used. If the linear velocity is low, it is not possible to form a bit that is many times longer than the laser spot size without distortion.
第４図に線速度が不十分な場合に形成された長いビット
の形状、第５図に線速度が十分に大きい場合に形成され
た長いビットの形状を示す。線速度が十分でないと、ピ
ット形成過程において、レーザ光通過後も、先に進んだ
レーザ照射部から熱伝導により加熱効果を受ける。この
ため、ビット終端部以外では十分に大きい冷却速度を得
ることができず、非晶質領域の幅、すなわちビット幅は
狭（なる。一方、線速度が十分大きいと、先に進んだレ
ーザ照射部からの熱伝導による加熱効果は小さい。この
ため、ピット全域にわたって十分に大きい冷却速度が得
られ、幅の広い形状の整った非晶質領域、すなわちビッ
トが得られる。FIG. 4 shows the shape of a long bit formed when the linear velocity is insufficient, and FIG. 5 shows the shape of a long bit formed when the linear velocity is sufficiently high. If the linear velocity is not sufficient, in the pit formation process, even after passing the laser beam, the laser beam will receive a heating effect due to heat conduction from the laser irradiation part that has advanced earlier. For this reason, it is not possible to obtain a sufficiently high cooling rate in areas other than the end of the bit, and the width of the amorphous region, that is, the bit width, becomes narrow.On the other hand, if the linear velocity is sufficiently large, The heating effect due to heat conduction from the pit is small.Therefore, a sufficiently high cooling rate can be obtained over the entire pit area, and a wide and well-shaped amorphous region, that is, a bit, can be obtained.
一方、実際に光ディスクを回転させ、信号を記録、再生
、消去するドライブをコンパクトで安価に生産しようと
すると、光ディスクの回転速度に制限がでる。それ故、
特にＣＡＭ（線速度一定）方式の光ディスクにおいてＰ
Ｗ Ｍ方式でディジタル信号を記録した場合には、線
速度の小さい光ディスクの内周部で記録再生信号の品質
劣化が顕著である。On the other hand, if an attempt is made to produce a compact and inexpensive drive that actually rotates an optical disk and records, plays, and erases signals, there will be a limit to the rotational speed of the optical disk. Therefore,
Especially in CAM (Constant Linear Velocity) type optical discs, P
When a digital signal is recorded using the WM method, the quality of the recorded/reproduced signal deteriorates significantly in the inner circumferential portion of the optical disc where the linear velocity is low.
問題点を解決するための手段
本発明は、上述の問題点を解決するために、ＣＡＶ方式
を用いた光ディスクの情報記録方式として、光ディスク
の内周部にはＰＰＭ方式を、光ディスクの外周部にはＰ
ＷＭ方式を採用する。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an information recording method for an optical disc using the CAV method, in which the PPM method is used for the inner circumference of the optical disk and the PPM method is used for the outer circumference of the optical disk. is P
Adopt the WM method.
作用
ＣＡＶ方式を用いた光ディスクの情報記録方式として、
光ディスクの内周部にはＰＰＭ方式を、光ディスクの外
周部にはＰＷＭ方式を採用することにより、線速度の比
較的遅い内周部においても良好な品質の記録再生信号を
得ることができ、かつ１枚の光ディスクにおいて大量の
情報を記録することが可能となる。As an information recording method for optical discs using the working CAV method,
By adopting the PPM method for the inner circumference of the optical disk and the PWM method for the outer circumference of the optical disk, it is possible to obtain recording and reproduction signals of good quality even in the inner circumference where the linear velocity is relatively slow. It becomes possible to record a large amount of information on one optical disc.
実施例
光ディスクｌを第１図のように４つの領域、非記録領域
３、記録領域４（内周部）、記録領域５（外周部）、非
記録領域６に分ける。中心穴２付近の領域３、外縁部の
領域６以外の領域４，５が記録領域である。内側の記録
領域４にはＰＰＭ方式で、外側の記録領域５にはＰＷＭ
方式で、ディジタル信号を記録する。前述のように、本
方式ｌ二よる記録は、特に重ね書き可能な相変化型光デ
ィスクにおいて効果的である。以下、さらに詳しく本発
明の実施例を示す。EXAMPLE An optical disc 1 is divided into four areas, a non-recording area 3, a recording area 4 (inner circumference), a recording area 5 (outer circumference), and a non-recording area 6 as shown in FIG. Areas 4 and 5 other than area 3 near the center hole 2 and area 6 at the outer edge are recording areas. The inner recording area 4 uses the PPM method, and the outer recording area 5 uses the PWM method.
This method records digital signals. As mentioned above, recording by this method is particularly effective for overwritable phase change optical discs. Examples of the present invention will be described in more detail below.
実施例１
第６図に実験に用いた光ディスクの構成を示す。直径５
．２５インチのポリカーボネート基板の上にＺｎＳ層、
ＧｅＴｅ層、ＺｎＳ層、Ａｕ層を順次積層し、さらに接
着剤を用いてポリカーボネート板を保護カバーとして貼
り合わせている。Example 1 FIG. 6 shows the configuration of the optical disc used in the experiment. Diameter 5
．． ZnS layer on 25 inch polycarbonate substrate,
A GeTe layer, a ZnS layer, and an Au layer are sequentially laminated, and a polycarbonate plate is further bonded to the layer using an adhesive as a protective cover.
ＺｎＳ層は基板及びＧｅＴｅ記録層を熱から守る役割を
果たしている。又、Ａｕ反射層は記録層における光吸収
効率を高める役割を果たしている。The ZnS layer serves to protect the substrate and the GeTe recording layer from heat. Furthermore, the Au reflective layer plays a role in increasing the light absorption efficiency in the recording layer.
ＧｅＴｅは結晶化速度の極めて速い材料であり、それ故
にここで用いた光ディスクは重ね書きが可能であるとと
もに、高速で記録・再生することが可能である。この光
ディスクを１８０Ｏｒｐｍで回転さぜながら、記録パワ
ー１２ｍＷ、消去パワー８ｍＷで同時消録（重ね書き）
を行った。記録する部位における線速度とＢＥＲ（ビッ
ト誤り率）との関係を実験的に求めた。結果を第７図に
示す。第７図（ａ）はＰ Ｗ Ｍ方式でディジタル信号
を記録した場合、第７図（ｂ）はＰＰＭ方式で記録した
場合の結果である。図かられかるように線速度が９．５
ｍ、／ｓ以下の場合、この実験では直径が１００ｍｍ以
下の領域では、ＰＷＭ方式で記録することは好ましくな
い。すなわち、直径１００ｍｍ以下の領域にはＰＰＭ方
式で記録し、直径１００ｍｍ以上の領域にはＰＷＭ方式
で記録すれば、光ディスクの内外周を問わず記録領域全
域にわたってＢＥＲは低く、かつ大量の情報を記録させ
ることができる。GeTe is a material with an extremely high crystallization speed, and therefore the optical disc used here can be overwritten and can be recorded and reproduced at high speed. While rotating this optical disc at 180 rpm, simultaneous erasure (overwriting) is performed with a recording power of 12 mW and an erasing power of 8 mW.
I did it. The relationship between the linear velocity and BER (bit error rate) at the recording site was experimentally determined. The results are shown in FIG. FIG. 7(a) shows the results when the digital signal is recorded using the PWM method, and FIG. 7(b) shows the result when the digital signal is recorded using the PPM method. As you can see from the figure, the linear velocity is 9.5
m,/s or less, in this experiment it is not preferable to record using the PWM method in a region with a diameter of 100 mm or less. In other words, if an area with a diameter of 100 mm or less is recorded using the PPM method, and an area with a diameter of 100 mm or more is recorded using the PWM method, the BER will be low over the entire recording area regardless of the inner or outer circumference of the optical disc, and a large amount of information can be recorded. can be done.
このように、内周部においてはＰＰＭ方式の利点が、外
周部においてはＰ Ｗ Ｍ方式の利点が１枚の光ディス
ク内で同時に得られ、かつ、それぞれの記録方式の問題
点が解決される。In this way, the advantages of the PPM method in the inner circumference and the advantages of the PWM method in the outer circumference can be obtained simultaneously within one optical disc, and the problems of each recording method are solved.
この実施例においては、記録領域４，５の境界を直径１
００ｍｍのところに定めたが、光ディスクの記録層材料
の結晶化速度や、回転数等の要因により、この境界直径
は当然変わりうる。In this embodiment, the boundary between the recording areas 4 and 5 has a diameter of 1
Although the boundary diameter is set at 00 mm, this boundary diameter may naturally vary depending on factors such as the crystallization speed of the recording layer material of the optical disc and the rotation speed.
発明の効果
本発明によれば、光ディスクの記録領域全域にわたって
低いＢＥＲが実現でき、しかも大量の１′１７報を記録
させることができる。Effects of the Invention According to the present invention, a low BER can be achieved over the entire recording area of an optical disc, and a large amount of 1'17 information can be recorded.
第１図は本発明の情報信号記録方法を示した光ディスク
を示す平面図、第２図はＰＰＭ方式及び記録ビットの形
状を示す図、第３図はＰ Ｗ Ｍ方式及び記録ビットの
形状を示す図、第４図は線速度が不十分な場合の長いビ
ットの形状を示す図、第５図は線速度が十分大きい場合
の長いビットの形状を示す図、第６図は実験に用いた光
ディスクの４１゛４成を示す断面図、第７図は線速度と
ＢＥＲの関係を示すグラフである。
１・・・・光ディスク、３・・・・非記録領域、４・・
・・記録領域（内周部）、５・・・・記録領域（外周部
）、６・・・・非記録領域。
代理人の氏名 弁理士 中尾敏男 ほか１名第１図
第２図
ナータ ｔｔｏｔｏｏｔ。
記録どット ■ ■ Ｏ＠
ナーク ｔｔｏｔｏｏｔ。
記録ピット Ｃ区ＥＧＧΣ区：！亙ΣＤ再生由刀波
形 ７（−−Ｊ−−−−Ａ−−−−−−−−ノー第４図
第５図
レーザ違（テ方向 （相対的）
第６図
第７図
メイスクＩ！径（ｍｒｒＬｌ
６ Ｂ ＋０ １２
４４！ 速 度 ［ｍ／ｇノ
ディスク直径（ｍｒｎ）
線速崖（ｍ／ｓ’FIG. 1 is a plan view of an optical disc showing the information signal recording method of the present invention, FIG. 2 is a diagram showing the PPM system and the shape of recording bits, and FIG. 3 is a diagram showing the PWM system and the shape of the recording bits. Figure 4 shows the shape of a long bit when the linear velocity is insufficient, Figure 5 shows the shape of a long bit when the linear velocity is sufficiently high, and Figure 6 shows the optical disc used in the experiment. FIG. 7 is a cross-sectional view showing the 41゛4 configuration, and FIG. 7 is a graph showing the relationship between linear velocity and BER. 1... Optical disc, 3... Non-recording area, 4...
...recording area (inner circumference), 5...recording area (outer circumference), 6...non-recording area. Name of agent: Patent attorney Toshio Nakao and one other person Figure 1 Figure 2 Nata ttotoot. Record dot ■ ■ O@ Narc ttootoot. Record pit C ward EGGΣ ward:!亙ΣD Reproduction waveform 7 (--J-----A----- (mrrLl 6 B +0 12 44! Velocity [m/g Nodisc diameter (mrn) Linear velocity cliff (m/s'
Claims (2)
の可逆的な相変化を生ずる記録層を備えた光ディスク上
に情報信号を記録するに際して、当該光ディスク上の記
録領域に、その内周部ではＰＰＭ方式で、その外周部で
はＰＷＭ方式でディジタル信号を記録することを特徴と
する光ディスクにおける情報信号記録方法。(1) When recording an information signal on an optical disc that is equipped with a recording layer that causes a reversible phase change between two states that can be detected by irradiation with a laser beam, etc., the inner circumference of the recording area on the optical disc is A method for recording an information signal on an optical disc, characterized in that a digital signal is recorded in a PPM method in a portion of the disc and in a PWM method in an outer peripheral portion thereof.
できるよう構成された特許請求の範囲第１項記載の光デ
ィスクにおける情報信号記録方法。(2) A method for recording information signals on an optical disc according to claim 1, wherein the optical disc is configured so that overwriting can be performed using one laser beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62314507A JP2583929B2 (en) | 1987-12-11 | 1987-12-11 | Information signal recording method on optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62314507A JP2583929B2 (en) | 1987-12-11 | 1987-12-11 | Information signal recording method on optical disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01155522A true JPH01155522A (en) | 1989-06-19 |
| JP2583929B2 JP2583929B2 (en) | 1997-02-19 |
Family
ID=18054120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62314507A Expired - Fee Related JP2583929B2 (en) | 1987-12-11 | 1987-12-11 | Information signal recording method on optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2583929B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03228228A (en) * | 1990-02-02 | 1991-10-09 | Canon Inc | Optical information recording system |
| JPH03288331A (en) * | 1990-04-04 | 1991-12-18 | Canon Inc | Optical information recording system |
| JPH0428054A (en) * | 1990-05-24 | 1992-01-30 | Hitachi Ltd | Information recording/reproducing device |
| JPH04186531A (en) * | 1990-11-20 | 1992-07-03 | Matsushita Electric Ind Co Ltd | Optical disk device |
| JPH04205721A (en) * | 1990-11-29 | 1992-07-27 | Matsushita Electric Ind Co Ltd | Recording system for disk |
| US5400313A (en) * | 1992-11-09 | 1995-03-21 | International Business Machines Corporation | Optical data storage system and method with reduced heat buildup |
| US5530688A (en) * | 1994-10-31 | 1996-06-25 | International Business Machines Corporation | Optical disk recording device using two modulated laser beams for recording information data |
| US5802031A (en) * | 1997-01-28 | 1998-09-01 | International Business Machines Corporation | Programmable PPM/PWM writing system for optical disk |
| US5825744A (en) * | 1996-05-13 | 1998-10-20 | International Business Machines Corporation | Configurable read detection channel and method for decoding data stored within a data storage medium |
| WO2002029790A2 (en) * | 2000-10-03 | 2002-04-11 | Matsushita Electric Industrial Co., Ltd. | Optical information medium, recording and reproduction apparatus, and recording and reproduction method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62121932A (en) * | 1985-11-22 | 1987-06-03 | Ricoh Co Ltd | Information recording device in optical disk |
-
1987
- 1987-12-11 JP JP62314507A patent/JP2583929B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62121932A (en) * | 1985-11-22 | 1987-06-03 | Ricoh Co Ltd | Information recording device in optical disk |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03228228A (en) * | 1990-02-02 | 1991-10-09 | Canon Inc | Optical information recording system |
| JPH03288331A (en) * | 1990-04-04 | 1991-12-18 | Canon Inc | Optical information recording system |
| JPH0428054A (en) * | 1990-05-24 | 1992-01-30 | Hitachi Ltd | Information recording/reproducing device |
| JPH04186531A (en) * | 1990-11-20 | 1992-07-03 | Matsushita Electric Ind Co Ltd | Optical disk device |
| JPH04205721A (en) * | 1990-11-29 | 1992-07-27 | Matsushita Electric Ind Co Ltd | Recording system for disk |
| US5400313A (en) * | 1992-11-09 | 1995-03-21 | International Business Machines Corporation | Optical data storage system and method with reduced heat buildup |
| US5530688A (en) * | 1994-10-31 | 1996-06-25 | International Business Machines Corporation | Optical disk recording device using two modulated laser beams for recording information data |
| US5825744A (en) * | 1996-05-13 | 1998-10-20 | International Business Machines Corporation | Configurable read detection channel and method for decoding data stored within a data storage medium |
| US5802031A (en) * | 1997-01-28 | 1998-09-01 | International Business Machines Corporation | Programmable PPM/PWM writing system for optical disk |
| WO2002029790A2 (en) * | 2000-10-03 | 2002-04-11 | Matsushita Electric Industrial Co., Ltd. | Optical information medium, recording and reproduction apparatus, and recording and reproduction method |
| WO2002029790A3 (en) * | 2000-10-03 | 2002-09-26 | Matsushita Electric Ind Co Ltd | Optical information medium, recording and reproduction apparatus, and recording and reproduction method |
| US7079477B2 (en) | 2000-10-03 | 2006-07-18 | Matsushita Electric Industrial Co., Ltd. | Optical information medium, recording and reproduction apparatus, and recording and reproduction method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2583929B2 (en) | 1997-02-19 |
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