JP2001176072A - Method of recording information - Google Patents
Method of recording informationInfo
- Publication number
- JP2001176072A JP2001176072A JP35201799A JP35201799A JP2001176072A JP 2001176072 A JP2001176072 A JP 2001176072A JP 35201799 A JP35201799 A JP 35201799A JP 35201799 A JP35201799 A JP 35201799A JP 2001176072 A JP2001176072 A JP 2001176072A
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- Prior art keywords
- pulse
- recording
- information
- cooling
- recorded
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、レーザ光の照射に
より情報の記録・再生・消去を行うための情報記録方法
に係り、特に相変化型の情報記録媒体に適した情報の記
録方法に関するものである。The present invention relates to an information recording method for recording, reproducing and erasing information by irradiating a laser beam, and more particularly to an information recording method suitable for a phase change type information recording medium. It is.
【０００２】[0002]
【従来の技術】従来、相変化型光ディスクの情報記録方
式としては、安定な結晶状態と非晶質状態を作り出し
て、その反射率の違いにより情報を記録する方式が用い
られている。ここで、結晶状態は、記録膜を結晶化温度
以上に昇温してゆっくりと冷却することにより得られ、
非晶質状態は、記録膜を融点以上に昇温して急速に冷却
することにより得られる。2. Description of the Related Art Conventionally, as a method of recording information on a phase-change type optical disk, a method of producing a stable crystalline state and an amorphous state and recording information based on a difference in reflectance is used. Here, the crystalline state is obtained by elevating the temperature of the recording film above the crystallization temperature and slowly cooling it,
The amorphous state can be obtained by raising the temperature of the recording film above its melting point and rapidly cooling it.
【０００３】この結晶状態と非晶質状態への変化をレー
ザビームの照射によって行うため、様々な情報記録方法
が提案されており、ＣＤ−ＲＷのようにマルチパルス記
録を用いた方法が実用化されている。[0003] Various information recording methods have been proposed for performing the change between the crystalline state and the amorphous state by irradiating a laser beam, and a method using multi-pulse recording such as CD-RW has been put into practical use. Have been.
【０００４】これはレーザービームのパワーを３段階に
し、記録するところには、記録膜が融解する高いパワー
のレーザーパルスを記録信号の長さに合う数の分だけ照
射した後に、低いレーザーパワーに落として冷却して非
晶質状態にするものであり、それ以外のところには、結
晶化温度にするパワーのレーザーを照射して結晶状態に
して情報の記録を行う方法である。[0004] In this method, the power of the laser beam is set in three stages. In the recording area, a high power laser pulse for melting the recording film is applied by a number corresponding to the length of the recording signal, and then the laser beam is reduced to a low laser power. This is a method of dropping and cooling to an amorphous state, and in other cases, irradiating a laser having a power for crystallization temperature to a crystalline state to record information.
【０００５】[0005]
【発明が解決しようとする課題】ところが、この方法を
用いて相変化型光ディスクの情報記録を行うと、先頭パ
ルスがマルチパルスより長い場合において最短マークが
０．６μｍ以下となるときに、特に最短マークを１パル
スで記録したときと、それ以上の長さのマークを２パル
ス以上で記録したときでは、マークの後端の形が変わっ
てしまう。これは例えば、マークエッジ記録方式での高
密度記録時において影響が顕著に現れ、記録信号に正し
く対応した再生信号が得られないなどの問題となる。However, when information is recorded on a phase-change type optical disk using this method, when the shortest mark becomes 0.6 μm or less when the leading pulse is longer than the multi-pulse, the shortest time is particularly short. When a mark is recorded with one pulse and when a mark longer than that is recorded with two or more pulses, the shape of the trailing end of the mark changes. This has a significant effect, for example, at the time of high-density recording in the mark edge recording method, and causes a problem that a reproduced signal corresponding to a recording signal cannot be obtained.
【０００６】本発明の目的は、このような従来技術の欠
点を解消し、記録パルス数に係わらずに後端の形状を揃
えたマークを形成することができる情報の記録方法を提
供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide an information recording method capable of forming a mark having the same rear end shape regardless of the number of recording pulses. is there.
【０００７】[0007]
【課題を解決するための手段】本発明者が種々検討した
結果、前記したマークの後端の形が変わってしまう原因
は、マークを形成する際、特に先頭パルス長がマルチパ
ルス長より長いときにマークによって記録膜の冷却過程
が異なることが理由であることが分かった。一方、先頭
パルス幅とマルチパルス幅を等しくして冷却過程をほぼ
等しくしたところ、最短マーク長が所定の長さよりも短
くなった。As a result of various studies conducted by the present inventor, the cause of the change in the shape of the trailing end of the mark is that when the mark is formed, particularly when the leading pulse length is longer than the multi-pulse length. It was found that the reason is that the cooling process of the recording film differs depending on the mark. On the other hand, when the head pulse width and the multi-pulse width were made equal to make the cooling process almost equal, the shortest mark length became shorter than the predetermined length.
【０００８】従って前記目的は、最短マークを１パルス
で照射し、それ以外のマークを、複数の記録パルスを照
射することによって記録する方法においては、記録パル
スの最終パルスの直後に照射される冷却パルスの幅を、
その直前に照射される記録パルス幅に応じて変化させ、
記録膜の冷却過程を同じにすることによって達成され
る。Accordingly, an object of the present invention is to provide a method of recording a shortest mark by irradiating the shortest mark with one pulse and irradiating other marks with a plurality of recording pulses. The width of the pulse
Change according to the recording pulse width irradiated immediately before,
This is achieved by making the cooling process of the recording film the same.
【０００９】また、複数の記録パルスを照射することに
よって記録する方法においては、冷却パルスの幅をその
直前に照射される２つの記録パルス幅に応じて変化さ
せ、記録膜の冷却過程を同じにすることにより、目的を
達成している。In the method of recording by irradiating a plurality of recording pulses, the width of the cooling pulse is changed according to the width of two recording pulses irradiated immediately before the recording pulse, and the cooling process of the recording film is made the same. By doing so, the purpose is achieved.
【００１０】さらに、より正確な冷却過程の制御を行う
ため、マーク長とその後ろのスペース長の組み合わせに
よって冷却パルス長を変えることにより、目的を達成し
ている。Further, in order to more accurately control the cooling process, the object is achieved by changing the cooling pulse length by a combination of the mark length and the space length behind the mark length.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。図１は本発明との比較のために示
す一般的な情報の記録方法の説明図、図２は本発明の情
報の記録方法の説明図である。ここで示す情報の記録方
法は、１ビームで記録・再生・消去を行うものであり、
このときＰｗは記録可能なレーザーパワー、Ｐｅは消去
可能なレーザーパワー、Ｐｒは読み出しパワーのレベル
を示している。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a general information recording method shown for comparison with the present invention, and FIG. 2 is an explanatory diagram of an information recording method of the present invention. The information recording method shown here performs recording / reproduction / erasing with one beam.
At this time, Pw indicates a recordable laser power, Pe indicates an erasable laser power, and Pr indicates a read power level.
【００１２】まず、一般的な記録方法について説明す
る。ここでは、相変化型光ディスク記録膜であるＡｇ−
Ｉｎ−Ｓｂ−Ｔｅ系記録膜に、マークエッジ方式により
最短マークが０．４μｍとなるような情報の記録・再生
を行った場合について述べる。ディスクは、ポリカーボ
ネート基板上に（ＺｎＳ）80（ＳｉＯ2 ）20（モル％）
９０ｎｍ、Ａｇ3.5 Ｉｎ6.5 Ｓｂ62.5 Ｔｅ27.5（ａｔ
％）１８ｎｍ、（ＺｎＳ）80（ＳｉＯ2 ）20（モル％）
２５ｎｍ、Ａｌ99 Ｔｉ1 （ｗｔ％）１００ｎｍを順次
積層した構成になっている。First, a general recording method will be described. Here, the phase change type optical disk recording film Ag-
A case in which information is recorded / reproduced on an In-Sb-Te-based recording film so that the shortest mark becomes 0.4 μm by a mark edge method will be described. The disk is (ZnS) 80 (SiO 2 ) 20 (mol%) on a polycarbonate substrate.
90 nm, Ag 3.5 In 6.5 Sb 62.5 Te 27.5 (at
%) 18 nm, (ZnS) 80 (SiO 2 ) 20 (mol%)
The structure is such that 25 nm and Al 99 Ti 1 (wt%) 100 nm are sequentially laminated.
【００１３】結晶状態である記録膜上に半導体レーザー
（波長６３５ｎｍ）を用いて、図１に示すように、先頭
パルス長はマルチパルス長の２倍になるような記録パル
ス列で、最短マークは１パルスで記録するようなマルチ
パルス記録を行った。Using a semiconductor laser (wavelength: 635 nm) on a crystalline recording film, as shown in FIG. 1, the leading pulse length is a recording pulse train that is twice the multi-pulse length, and the shortest mark is one. Multi-pulse recording such as recording with a pulse was performed.
【００１４】Ｐｗを１２ｍＷ、Ｐｅを６ｍＷ、Ｐｒを
０．５ｍＷに設定し、記録パターンはランダムパターン
を用いた。各マーク長に対する冷却パルスの幅を下記の
表に示す（比較例参照）。このようにして記録した情報
を波長６４７ｎｍ、ＮＡ０．６の半導体レーザを用いて
再生すると、最短マークのみ所定の長さより長く、それ
以外のマークは所定の長さより短くなってしまい、ジッ
ターが１４％と悪くなった。図３に各マーク長における
理想値からの差を示す。これはマーク後端の形状に違い
が見られ、マークによって記録膜の冷却過程が異なって
いるためであると考えられる。Pw was set to 12 mW, Pe to 6 mW, and Pr to 0.5 mW, and a random pattern was used as a recording pattern. The width of the cooling pulse for each mark length is shown in the table below (see Comparative Example). When the information recorded in this way is reproduced using a semiconductor laser having a wavelength of 647 nm and NA of 0.6, only the shortest mark is longer than a predetermined length, and the other marks are shorter than the predetermined length. And it got worse. FIG. 3 shows the difference from the ideal value for each mark length. This is considered to be because the shape of the trailing end of the mark is different, and the cooling process of the recording film is different depending on the mark.
【００１５】そこで実施例１として図２のように、４Ｔ
以上のマークの冷却パルス長だけを変化させた記録パル
ス列で、先頭パルス長はマルチパルス長の２倍になるよ
うな記録パルス列で、最短マークは１パルスで記録する
ようなマルチパルス記録を行ったところ、８％と良好な
ジッターが得られた。Therefore, as a first embodiment, as shown in FIG.
A recording pulse train in which only the cooling pulse length of the above-mentioned mark is changed, a leading pulse length is a recording pulse train that is twice the multi-pulse length, and a multi-pulse recording is performed such that the shortest mark is recorded by one pulse. However, a good jitter of 8% was obtained.
【００１６】また実施例２として、３Ｔ、４Ｔ、５Ｔ以
上のマークでの冷却パルス長だけを変化させた記録パル
ス列で同様に記録を行なったところ、図３に示すように
マーク長と理想値の差が小さく、７．５％とさらに良好
なジッターが得られた。As Example 2, when recording was similarly performed using a recording pulse train in which only the cooling pulse length was changed for marks 3T, 4T, and 5T or more, as shown in FIG. The difference was small, and a better jitter of 7.5% was obtained.
【００１７】 表 冷 却 パ ル ス 幅 記録マーク長 （実施例１） （実施例２） （比較例） ３Ｔ ０．８Ｔ ０．８Ｔ １．０Ｔ ４Ｔ １．２５Ｔ １．０Ｔ １．０Ｔ ５Ｔ １．２５Ｔ １．２５Ｔ １．０Ｔ ６Ｔ １．２５Ｔ １．２５Ｔ １．０Ｔ ７Ｔ １．２５Ｔ １．２５Ｔ １．０Ｔ ８Ｔ １．２５Ｔ １．２５Ｔ １．０Ｔ ９Ｔ １．２５Ｔ １．２５Ｔ １．０Ｔ １０Ｔ １．２５Ｔ １．２５Ｔ １．０Ｔ １１Ｔ １．２５Ｔ １．２５Ｔ １．０Ｔ １４Ｔ １．２５Ｔ １．２５Ｔ １．０Ｔ 本実施例においては、長いマークを記録するときの冷却
パルス幅を長くする場合について述べたが、情報記録媒
体の構造、記録膜の組成を変えた場合には、長いマーク
を記録するときの冷却パルス幅を短くすることにより、
ジッターを良くすることができた。Table Cooling pulse width Record mark length (Example 1) (Example 2) (Comparative example) 3T 0.8T 0.8T 1.0T 4T 1.25T 1.0T 1.0T 5T 1. 25T 1.25T 1.0T 6T 1.25T 1.25T 1.0T 7T 1.25T 1.25T 1.0T 8T 1.25T 1.25T 1.0T 9T 1.25T 1.25T 1.0T 10T 1. 25T 1.25T 1.0T 11T 1.25T 1.25T 1.0T 14T 1.25T 1.25T 1.0T In this embodiment, the case where the cooling pulse width is increased when a long mark is recorded has been described. However, when the structure of the information recording medium, the composition of the recording film is changed, by shortening the cooling pulse width when recording a long mark,
Jitter could be improved.
【００１８】[0018]
【発明の効果】本発明は前述のような構成になってお
り、どのような長さのマークを形成する場合において
も、冷却パルス長を調整することによって記録膜の冷却
過程を制御し、後端の形状を揃えることができるので、
再生信号のエラーレートを少なくすることができ、信頼
性の向上が図れる。The present invention has the above-described structure. In any case of forming a mark of any length, the cooling process of the recording film is controlled by adjusting the cooling pulse length, Because the shape of the end can be aligned,
The error rate of the reproduction signal can be reduced, and the reliability can be improved.
【図１】一般的な情報の記録方法における記録波形図で
ある。FIG. 1 is a recording waveform diagram in a general information recording method.
【図２】本発明の実施の形態の情報の記録方法を説明す
るための記録波形図である。FIG. 2 is a recording waveform diagram for explaining an information recording method according to an embodiment of the present invention.
【図３】本発明の実施の形態を利用した各マーク長にお
ける理想値からの差を示す図である。FIG. 3 is a diagram showing a difference from an ideal value in each mark length using the embodiment of the present invention.
Claims (3)
録媒体に書き換えを含む情報の記録を行う方法であっ
て、前記情報記録媒体に記録されるべき最短のマーク長
が０．６μｍ以下となるような情報の記録方法におい
て、 照射されるレーザ光のパワーを、パワーレベルの低い方
から順に第１、第２、第３の３つのレベルに設定して、
情報の記録を行うとき、まずレーザパワーを第２のレベ
ルに設定し、最短マークの記録は、第３のレベルの記録
パルス１つとその直後に照射される第１のレベルの冷却
パルス１つとによって行い、それ以外のマークの記録
は、最短マークを記録するときの記録パルス幅にほぼ等
しい先頭パルスとそれより短いマルチパルスからなる複
数の記録パルスと記録パルスの最終パルスの直後に照射
される冷却パルスとによって行い、かつ、前記冷却パル
スの幅を、その直前に照射される記録パルス幅に応じて
変化させることを特徴とする情報の記録方法。1. A method for recording information including rewriting on a phase change type information recording medium by irradiating a laser beam, wherein the shortest mark length to be recorded on the information recording medium is 0.6 μm or less. In the information recording method as described above, the power of the laser beam to be irradiated is set to three levels of first, second, and third in order from the lowest power level,
When recording information, first, the laser power is set to the second level, and the shortest mark is recorded by one recording pulse of the third level and one cooling pulse of the first level which is irradiated immediately after the recording pulse. The recording of the other marks is performed by cooling immediately before the last pulse of the recording pulse and a plurality of recording pulses composed of a leading pulse almost equal to the recording pulse width when recording the shortest mark and a multi-pulse shorter than that. A method for recording information, wherein the method is performed by using a pulse, and the width of the cooling pulse is changed according to the width of a recording pulse irradiated immediately before the cooling pulse.
録媒体に書き換えを含む情報の記録を行う方法であっ
て、前記情報記録媒体に記録されるべき最短のマーク長
が０．６μｍ以下となるような情報の記録方法におい
て、 照射されるレーザ光のパワーを、パワーレベルの低い方
から順に第１、第２、第３の３つのレベルに設定して、
情報の記録を行うとき、まずレーザパワーを第２のレベ
ルに設定し、その後、第３のレベルを持つ複数の記録パ
ルスと、最終の記録パルスの直後に照射される冷却パル
スにより情報の記録を行い、記録パルスの先頭パルス幅
を、他のパルス幅よりも長く設定し、前記冷却パルスの
幅を、その直前に照射される２つの記録パルスのパルス
幅に応じて変化させることを特徴とする情報の記録方
法。2. A method for recording information including rewriting on a phase change type information recording medium by irradiating a laser beam, wherein the shortest mark length to be recorded on the information recording medium is 0.6 μm or less. In the information recording method as described above, the power of the laser beam to be irradiated is set to three levels of first, second, and third in order from the lowest power level,
When recording information, first, the laser power is set to the second level, and then information is recorded by a plurality of recording pulses having the third level and a cooling pulse irradiated immediately after the last recording pulse. Performing, the leading pulse width of the recording pulse is set longer than the other pulse widths, and the width of the cooling pulse is changed according to the pulse widths of two recording pulses irradiated immediately before the cooling pulse. How information is recorded.
において、前記マーク長とその後ろのスペース長の組み
合わせによって冷却パルス長を変えることを特徴とする
情報の記録方法。3. The information recording method according to claim 1, wherein a cooling pulse length is changed by a combination of the mark length and a space length behind the mark length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35201799A JP2001176072A (en) | 1999-12-10 | 1999-12-10 | Method of recording information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35201799A JP2001176072A (en) | 1999-12-10 | 1999-12-10 | Method of recording information |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001176072A true JP2001176072A (en) | 2001-06-29 |
Family
ID=18421219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35201799A Pending JP2001176072A (en) | 1999-12-10 | 1999-12-10 | Method of recording information |
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| Country | Link |
|---|---|
| JP (1) | JP2001176072A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003025916A1 (en) * | 2001-09-11 | 2003-03-27 | Tdk Corporation | Optical recording medium, method and apparatus for recording information on optical recording medium |
| WO2003025915A1 (en) * | 2001-09-11 | 2003-03-27 | Tdk Corporation | Optical recording medium, method and apparatus for recording information onto optical recording medium |
| US7362682B2 (en) | 2003-08-27 | 2008-04-22 | Tdk Corporation | Method for recording data in an optical recording disc and an apparatus for recording data in an optical recording disc |
| US7502295B2 (en) | 2004-02-12 | 2009-03-10 | Tdk Corporation | Method for recording information on optical recording medium and information recording apparatus |
| WO2009081757A1 (en) * | 2007-12-26 | 2009-07-02 | Taiyo Yuden Co., Ltd. | Optical information recording device and method |
| US7606126B2 (en) | 2003-09-18 | 2009-10-20 | Mitsubishi Kagaku Media Co., Ltd. | Information recording method and information recording medium |
| KR100996038B1 (en) | 2003-05-23 | 2010-11-22 | 파나소닉 주식회사 | Recording apparatus of information recording medium, information recording medium, recording method of information recording medium, and computer readable recording medium having program for recording information in information recording medium |
-
1999
- 1999-12-10 JP JP35201799A patent/JP2001176072A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003025916A1 (en) * | 2001-09-11 | 2003-03-27 | Tdk Corporation | Optical recording medium, method and apparatus for recording information on optical recording medium |
| WO2003025915A1 (en) * | 2001-09-11 | 2003-03-27 | Tdk Corporation | Optical recording medium, method and apparatus for recording information onto optical recording medium |
| US7224663B2 (en) | 2001-09-11 | 2007-05-29 | Tdk Corporation | Optical recording medium, method of recording information to an optical recording medium, and information recording apparatus |
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