JPH0792915B2 - Pit recording method by light irradiation - Google Patents
Pit recording method by light irradiationInfo
- Publication number
- JPH0792915B2 JPH0792915B2 JP61027711A JP2771186A JPH0792915B2 JP H0792915 B2 JPH0792915 B2 JP H0792915B2 JP 61027711 A JP61027711 A JP 61027711A JP 2771186 A JP2771186 A JP 2771186A JP H0792915 B2 JPH0792915 B2 JP H0792915B2
- Authority
- JP
- Japan
- Prior art keywords
- recording
- pit
- light irradiation
- width
- focused beam
- 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
Description
【発明の詳細な説明】 （技術分野） 本発明は、レーザ集光ビームを、色素記録膜からなる記
録層を有する光ディスクなどの記録媒体に照射し、情報
信号を熱的に記録するようにした光照射によるピット記
録方法に関する。Description: TECHNICAL FIELD The present invention irradiates a recording medium such as an optical disc having a recording layer made of a dye recording film with a laser focused beam to thermally record an information signal. The present invention relates to a pit recording method using light irradiation.
（従来技術） レーザ集光ビームを、色素記録膜からなる記録層を有す
る光ディスクなどの記録媒体に対し相対的に走査しなが
ら照射し、情報信号を記録ピットの長さおよび記録ピッ
トの間隔の変化として記録するようにした光照射による
ピット記録方法が知られている。(Prior Art) A laser focused beam is irradiated while relatively scanning a recording medium such as an optical disk having a recording layer made of a dye recording film, and an information signal is changed in the length of the recording pit and the interval between the recording pits. A pit recording method using light irradiation is known.
第３図は、上記ピット記録方法に用いられる光学系の例
を示す。符号６はレーザ集光ビーム、７は記録媒体の透
明基板、８は同基板に設けられた光吸収反射性の記録膜
である。レーザ集光ビーム６は、透明基板７を通して記
録膜８に照射される。記録媒体を回転駆動するなどして
レーザ集光ビーム６を記録媒体に対し相対的に走査させ
る一方、記録しようとする情報信号に応じてレーザ集光
ビーム６のパワーを切り換えることにより記録ピットを
形成するようになっている。FIG. 3 shows an example of an optical system used in the above pit recording method. Reference numeral 6 is a laser focused beam, 7 is a transparent substrate of the recording medium, and 8 is a light absorbing / reflecting recording film provided on the substrate. The laser condensed beam 6 is applied to the recording film 8 through the transparent substrate 7. A recording pit is formed by switching the power of the laser focused beam 6 according to an information signal to be recorded while the laser focused beam 6 is relatively scanned with respect to the recording medium by rotationally driving the recording medium. It is supposed to do.
第４図は、上記の如くして形成された記録ピットと照射
パワーとの関係を示す。第４図において、P2はピットを
形成するに足る照射光パワーであり、P1はピットを形成
することのない弱い照射光パワーであって、この弱い照
射光パワーP1はオフの状態であってもよい。列をなして
形成されるピット1,3,5の長さおよびこれらピットの間
隔部分2,4の長さは記録しようとする情報信号に応じて
変わる。このような長さおよび間隔が変化するピットを
形成するために、従来は、照射光パワーを、形成しよう
とするピットの長さおよびピット間の長さに応じて忠実
にP2とP1に切り換えていた。FIG. 4 shows the relationship between the recording pits formed as described above and the irradiation power. In FIG. 4, P 2 is irradiation light power sufficient to form a pit, P 1 is weak irradiation light power that does not form a pit, and this weak irradiation light power P 1 is in an off state. It may be. The lengths of the pits 1, 3, 5 formed in rows and the lengths of the interval portions 2, 4 of these pits vary depending on the information signal to be recorded. In order to form pits of which length and spacing vary, conventionally, the irradiation light power is faithfully set to P 2 and P 1 according to the length of pits to be formed and the length between pits. I was switching.
ところが、レーザ集光ビームは、半値幅で0.8μｍ乃至
１μｍ程度の大きさをもっていることから、ピットが所
期の長さよりも長くなって記録される傾向がある。その
ため、再生信号にずれを生ずる所謂ジッタが発生した
り、また、再生ビームを照射することによりピット部分
における再生信号パルスの長さがより一層長くなって信
号劣化が発生し易いという問題があった。However, since the laser focused beam has a half-width of about 0.8 μm to 1 μm, pits tend to be recorded longer than the intended length. Therefore, there is a problem that so-called jitter that causes a deviation in the reproduction signal is generated, or that the reproduction beam is irradiated and the length of the reproduction signal pulse in the pit portion is further lengthened, which easily causes signal deterioration. .
（目的） 本発明の目的は、色素記録膜からなる記録層を有する記
録媒体に対するピット記録方法であって、再生信号のエ
ラーの原因となるジッタの発生を減少させることが可能
な光照射によるピット記録方法を提供することにある。(Object) An object of the present invention is to provide a pit recording method for a recording medium having a recording layer made of a dye recording film, which is capable of reducing the occurrence of jitter that causes an error in a reproduction signal. It is to provide a recording method.
（構成） 本発明は、色素記録膜からなる記録層を有する記録媒体
に対してピットを記録するときに、照射するレーザ集光
ビームの発光パルスの幅をレーザ集光ビームの半値幅の
５％乃至30％に相当する時間だけ短縮して照射すること
を特徴とする。(Structure) In the present invention, when recording a pit on a recording medium having a recording layer made of a dye recording film, the width of the emission pulse of the laser focused beam to be irradiated is 5% of the half-value width of the laser focused beam. It is characterized in that irradiation is shortened by a time corresponding to 30% to 30%.
以下、本発明の実施例について説明する。Examples of the present invention will be described below.
第１図の実施例は、形成しようとするピット11,13,15の
前端に対応するレーザ集光ビームの発光パルスの立ち上
がり部分Ａのタイミングを遅らせることにより上記発光
パルスの幅を短縮し、この短縮された発光パルスでピッ
トを形成するようにしたものである。短縮された発光パ
ルスで形成されたピットの長さは、レーザ集光ビームが
前述のように半値幅で0.8μｍ乃至１μｍ程度の大きさ
をもっていることから、上記発光パルスの幅よりも多少
長くなり、所期の長さのピットを得ることができる。よ
って、再生信号のエラーの原因となるジッタの発生を減
少させることができ、信頼性の高い再生信号を得ること
ができる。The embodiment of FIG. 1 shortens the width of the light emission pulse by delaying the timing of the rising portion A of the light emission pulse of the laser focused beam corresponding to the front ends of the pits 11, 13, 15 to be formed. The pits are formed by the shortened light emitting pulse. The length of the pit formed by the shortened emission pulse is slightly longer than the width of the above emission pulse because the laser focused beam has a half-value width of about 0.8 μm to 1 μm as described above. , You can get a pit of the desired length. Therefore, it is possible to reduce the occurrence of jitter that causes an error in the reproduction signal, and it is possible to obtain a highly reliable reproduction signal.
第２図の実施例は、形成しようとするピットの前端に対
応する発光パルスの立ち上がり部分Ａを緩やかにして上
記発光パルスの幅を実質的に短縮し、もって、第１図の
実施例の場合と同様の効果をもたせたものである。In the embodiment of FIG. 2, the rising portion A of the light emission pulse corresponding to the front end of the pit to be formed is made gentle to substantially shorten the width of the light emission pulse. Therefore, in the case of the embodiment of FIG. It has the same effect as.
次に、発光パルス幅の短縮率とジッタ減少効果に関する
実験データを示す。Next, experimental data on the reduction rate of the emission pulse width and the jitter reduction effect will be shown.
集光ビーム：波長790nmの半導体レーザ光を開口数0.5の
集光レンズで集光し、半値幅0.9μｍのスポットとし
た。Focused beam: A semiconductor laser beam having a wavelength of 790 nm was focused by a focusing lens having a numerical aperture of 0.5 to form a spot having a half width of 0.9 μm.
線速度：記録媒体をターンテーブルに載せ、1.2m/sの線
速度で集光スポットに対して移動させた。Linear velocity: The recording medium was placed on a turntable and moved at a linear velocity of 1.2 m / s with respect to the focused spot.
記録媒体：ポリメタクリル酸メチル（PMMA）基板にフォ
トポリマー法により案内溝を設け、その上にシアニン色
素をジクロルエタンに溶かし400乃至900Åの厚さで塗布
してなる、色素濃度の変化を利用した記録媒体を用い
た。Recording medium: Polymethylmethacrylate (PMMA) substrate is provided with guide grooves by photopolymer method, and cyanine dye is dissolved in dichloroethane and applied at a thickness of 400 to 900Å. The medium was used.
記録信号：疑似ランダム信号をM2コードに変換し、この
信号で半導体レーザを変調し、記録媒体に0.95μm/bit
の記録密度で記録した。Recording signal: Converts a pseudo-random signal into an M 2 code, modulates a semiconductor laser with this signal, and records it on a recording medium at 0.95 μm / bit
It was recorded at the recording density of.
表１及び表２はその実験結果であり、表１は発光パルス
の立ち上がり時間及び立ち下がり時間を一定とし、パル
ス短縮率を変化させた場合、表２は発光パルスの立ち上
がり時間とパルス短縮率を変化させ、発光パルスの立ち
下がり時間を一定とした場合を示す。ここで、「パルス
幅短縮率」とは、 のことである。Tables 1 and 2 show the experimental results. Table 1 shows the rise time and the fall time of the emission pulse when the rise time and the fall time of the emission pulse are constant and the pulse shortening rate is changed. A case in which the fall time of the light emission pulse is made constant by changing it is shown. Here, the "pulse width reduction rate" is That is.
表１における実験No.1は、パルス幅短縮率が０％、即
ち、従来技術に該当するデータであって、そのときのジ
ッタは120n秒である。上記実験データから明らかなよう
に、パルス幅短縮率が５％乃至30％であれば、従来技術
よりもジッタを減少させることができる。 In Experiment No. 1 in Table 1, the pulse width reduction rate is 0%, that is, data corresponding to the conventional technique, and the jitter at that time is 120 nsec. As is clear from the above experimental data, if the pulse width reduction rate is 5% to 30%, the jitter can be reduced as compared with the conventional technique.
なお、上記実験データで「再生回数」とは、再生時のエ
ラーが初期の２倍になるまでの再生回数のことであり、
２×106回で実験を打ち切った。従って、初期にエラー
が多い場合は再生回数も多くなる傾向にあるので、発明
の効果に直接結びつけることはできないが、パルス幅を
短縮することにより再生回数が増加する傾向にあり、記
録媒体に耐久性が高まるであろうことは推測できる。In the above experimental data, the "reproduction count" is the number of reproductions until the error during reproduction is doubled from the initial value,
The experiment was terminated at 2 × 10 6 times. Therefore, if there are many errors in the initial stage, the number of times of reproduction tends to increase, so it cannot be directly linked to the effect of the invention, but the number of times of reproduction tends to increase by shortening the pulse width, and the number of times of reproduction tends to increase. It can be inferred that it will increase in nature.
（効果） 本発明によれば、色素記録膜からなる記録層を有する記
録媒体に対してピットを記録するに当たり、実験データ
に基づいて、照射するレーザ集光ビームの発光パルスの
幅をレーザ集光ビームの半値幅の５％乃至30％に相当す
る時間だけ短縮して照射するようにしたため、再生信号
のエラーの原因となるジッタを減少させることができ、
もって、再生信号の信頼性を高めることができる。(Effect) According to the present invention, when recording pits on a recording medium having a recording layer made of a dye recording film, the width of the emission pulse of the laser focused beam to be irradiated is determined based on experimental data. Since the irradiation is shortened by a time corresponding to 5% to 30% of the half width of the beam, it is possible to reduce the jitter that causes an error in the reproduction signal.
Therefore, the reliability of the reproduced signal can be improved.
第１図は本発明に係る光照射によるピット記録方法の一
実施例を示す発光パルス波形図、第２図は本発明に係る
光照射によるピット記録方法の別の実施例を示す発光パ
ルス波形図、第３図は光照射によるピット記録に用いら
れる一般的な光学系の例を示す側面図、第４図は従来の
光照射によるピット記録方法の例を示す発光パルス波形
図である。 ６……レーザ集光ビーム、11,13,15……記録ピット。FIG. 1 is a light emission pulse waveform diagram showing an embodiment of a pit recording method by light irradiation according to the present invention, and FIG. 2 is a light emission pulse waveform diagram showing another embodiment of a pit recording method by light irradiation according to the present invention. FIG. 3 is a side view showing an example of a general optical system used for pit recording by light irradiation, and FIG. 4 is a light emission pulse waveform diagram showing an example of a conventional pit recording method by light irradiation. 6 ... laser focused beam, 11,13,15 ... recording pit.
Claims (1)
してレーザ集光ビームを相対的に走査しながら透明基板
側から照射し、情報信号を記録ピットの長さおよび記録
ピットの間隔の変化として上記記録層に記録する方式の
光照射によるピット記録方法において、上記記録層は色
素記録膜からなり、この記録層にピットを記録するとき
に、レーザ集光ビームの発光パルスの幅を、レーザ集光
ビームの半値幅の５％乃至30％に相当する時間だけ短縮
して照射することを特徴とする光照射によるピット記録
方法。1. A recording medium having a recording layer on a transparent substrate is irradiated with a laser focused beam from the transparent substrate side while relatively scanning the recording medium, and an information signal of the recording pit length and the recording pit interval is displayed. In the pit recording method by light irradiation of a method of recording on the recording layer as a change, the recording layer is composed of a dye recording film, and when recording pits on this recording layer, the width of the emission pulse of the laser focused beam is changed to A method for pit recording by light irradiation, which comprises irradiating light with a time reduced by 5% to 30% of the full width at half maximum of a focused laser beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61027711A JPH0792915B2 (en) | 1986-02-10 | 1986-02-10 | Pit recording method by light irradiation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61027711A JPH0792915B2 (en) | 1986-02-10 | 1986-02-10 | Pit recording method by light irradiation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62185250A JPS62185250A (en) | 1987-08-13 |
| JPH0792915B2 true JPH0792915B2 (en) | 1995-10-09 |
Family
ID=12228581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61027711A Expired - Lifetime JPH0792915B2 (en) | 1986-02-10 | 1986-02-10 | Pit recording method by light irradiation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0792915B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07118108B2 (en) * | 1988-06-28 | 1995-12-18 | 日本電気株式会社 | Recording method of optical information |
| JP2893091B2 (en) * | 1990-06-18 | 1999-05-17 | 株式会社リコー | Optical information recording method |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6016013B2 (en) * | 1974-05-15 | 1985-04-23 | キヤノン株式会社 | Signal recording method |
| NL7809159A (en) * | 1977-09-29 | 1979-04-02 | Philips Nv | INFORMATION REGISTRATION ELEMENT WITH DYE CONTAINING AUXILIARY LAYER. |
| JPS55118184A (en) * | 1979-03-07 | 1980-09-10 | Hitachi Ltd | Optical recording device |
| JPS5778637A (en) * | 1980-10-31 | 1982-05-17 | Matsushita Electric Ind Co Ltd | Optical information recorder |
| JPS589230A (en) * | 1981-07-08 | 1983-01-19 | Tdk Corp | Optical recording medium |
| JPS58208938A (en) * | 1982-05-31 | 1983-12-05 | Sony Corp | Disk recording device |
| JPS5922240A (en) * | 1982-07-28 | 1984-02-04 | Toshiba Corp | Recording device of digital information |
| JPS5922239A (en) * | 1982-07-28 | 1984-02-04 | Fujitsu Ltd | Method for controlling optical recording |
| JPS5924452A (en) * | 1982-07-30 | 1984-02-08 | Fujitsu Ltd | Optical disk recording system |
-
1986
- 1986-02-10 JP JP61027711A patent/JPH0792915B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62185250A (en) | 1987-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0411120B1 (en) | Laser reproduction apparatus | |
| US20060083154A1 (en) | Optical recording medium, optical recording method, optical reproducing method, optical recording apparatus, and optical reproducing apparatus | |
| EP0814464B1 (en) | Method of manufacturing an optical disk | |
| JPH0348577B2 (en) | ||
| JPH0792915B2 (en) | Pit recording method by light irradiation | |
| KR100813942B1 (en) | Method for high rate optical recording and apparatus thereof | |
| KR20050085346A (en) | Apparatus and method for recording an information on a recordable optical record carrier using oval spot profile | |
| JPH08297855A (en) | Compatible recording and/or reproducing apparatus | |
| JP2615650B2 (en) | Recording method for optical information recording member | |
| JPH0449525A (en) | Optical information recording method | |
| JPS6233648B2 (en) | ||
| JP2778428B2 (en) | Optical disk drive | |
| JP3006645B2 (en) | Optical disk drive | |
| JPH0253223A (en) | Optical recording and reproducing method | |
| JPS60243832A (en) | Optical information detecting device | |
| JP3788873B2 (en) | Optical information recording method and recording / reproducing apparatus | |
| JPH0565939B2 (en) | ||
| JP2002117545A (en) | Optical recording medium | |
| JP3179899B2 (en) | Recordable optical disk | |
| JPS5922240A (en) | Recording device of digital information | |
| JPH05114138A (en) | Recording and reproducing method for optical recording disk | |
| JP3306975B2 (en) | Optical disc reproducing method and optical disc | |
| JP4404812B2 (en) | Magneto-optical disk unit | |
| JPH10302322A (en) | Optical disk and manufacture therefor | |
| JPH0594624A (en) | Optical reproducing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |