JPH11219527A - Recording medium of information, recording method and recorder - Google Patents
Recording medium of information, recording method and recorderInfo
- Publication number
- JPH11219527A JPH11219527A JP10315630A JP31563098A JPH11219527A JP H11219527 A JPH11219527 A JP H11219527A JP 10315630 A JP10315630 A JP 10315630A JP 31563098 A JP31563098 A JP 31563098A JP H11219527 A JPH11219527 A JP H11219527A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- information
- signal
- recording medium
- dummy
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はレーザ光等の記録用ビー
ムによって、たとえば映像や音声などのアナログ符号を
ＦＭ変調したものや、たとえば電子計算機のデータや、
ファクシミリ信号やディジタルオーディオ信号などのデ
ィジタル情報を、リアルタイムで記録することが可能な
情報の記録媒体と記録方法および記録装置に関するもの
である。特に、書き換え可能相変化型光記録膜を用いた
ディスクに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which analog codes such as video and audio are FM-modulated by a recording beam such as a laser beam, data of an electronic computer,
The present invention relates to an information recording medium, a recording method, and a recording apparatus capable of recording digital information such as a facsimile signal and a digital audio signal in real time. In particular, the present invention relates to a disk using a rewritable phase-change optical recording film.
【０００２】[0002]
【従来の技術】書き換え可能な記録膜への記録・消去方
法は、例えば、記録するレーザ照射時間とほぼ同じ程度
の時間で結晶化が行える高速消去が可能な相変化型光デ
ィスク用記録膜を用いた場合に、１つのエネルギービー
ムのパワーを、いずれも読み出しパワーレベルより高い
少なくとも２つのレベル、すなわち少なくとも高いパワ
ーレベルと中間のパワーレベルとの間で変化させること
により行っていた。この方法では、既存の情報を消去し
ながら新しい情報を記録する、いわゆるオーバーライト
（重ね書きによる書き換え）が可能になるという利点が
ある。この相変化型光ディスクに対して多数回の書き換
えを行なう場合、記録情報信号により高いパワーレベル
でのレーザビームを繰り返し照射することになる。特
に、プリフォーマット部に近い領域では、同じ場所にＶ
ＦＯや記録マークなどが繰り返し記録される確率が高く
なり、その為に、記録膜の流動による局部的な膜厚変化
が生じやすくなる。2. Description of the Related Art A method for recording and erasing data on a rewritable recording film uses, for example, a recording film for a phase-change optical disk capable of high-speed erasing that can be crystallized in substantially the same time as the laser irradiation time for recording. In such a case, the power of one energy beam is changed by changing the power between at least two levels higher than the read power level, that is, at least between a high power level and an intermediate power level. This method has an advantage that so-called overwriting (rewriting by overwriting) in which new information is recorded while erasing existing information is possible. When rewriting is performed many times on this phase change optical disk, a laser beam at a higher power level is repeatedly irradiated by a recording information signal. In particular, in the area near the preformat section, V
The probability that the FO, the recording mark, and the like are repeatedly recorded increases, and therefore, a local change in the film thickness due to the flow of the recording film easily occurs.
【０００３】この問題を改良する方法として、特開平３
−１５０７２５に記載のごとく、データを書き換える際
に、１回毎あるいは適当な回数毎に、データの書き始め
位置をランダムにシフトさせる方法がある。これによ
り、マークの形成位置を適当に分散させることができ、
書き換え特性も向上した。As a method for solving this problem, Japanese Patent Laid-Open No.
As described in -150725, there is a method of randomly shifting the data writing start position once or at an appropriate number of times when rewriting data. Thereby, the formation positions of the marks can be appropriately dispersed,
The rewriting characteristics have also been improved.
【０００４】[0004]
【発明が解決しようとする課題】上述した従来の技術を
用いて相変化型光ディスクに情報の記録を行ったとして
も、レーザビーム内における温度分布の非対称性によ
り、多数回の書き換えにより全体的な記録膜の流動は生
じてしまう。そのために、記録領域の始端部や終端部に
一方の膜厚が厚く、他方の膜厚が薄くなる記録膜の膜厚
変化が起こって、再生信号波形歪みが生じ、更にこの波
形歪みの生じた領域が書き換え回数が多くなるに従って
広くなってくるという問題があった。また書き換え可能
なデジタルビデオディスクなどでは、高密度化のために
記録マークの両端（エッジ）に情報を持たせたマークエ
ッジ記録を用いる可能性が有る。このようなマークエッ
ジ記録方式の場合には、長マークを繰り返し記録するた
め流動による劣化はさらに顕著となる。Even if information is recorded on a phase-change type optical disk by using the above-mentioned conventional technique, the entirety is rewritten many times due to the asymmetry of the temperature distribution in the laser beam. Flow of the recording film occurs. For this reason, the thickness of one of the recording films becomes thicker at the beginning and end of the recording area and the other becomes thinner. This causes a change in the thickness of the recording film, resulting in a reproduced signal waveform distortion. There is a problem that the area becomes wider as the number of times of rewriting increases. In a rewritable digital video disk or the like, there is a possibility of using mark edge recording in which information is provided at both ends (edges) of a recording mark for higher density. In the case of such a mark edge recording method, since long marks are repeatedly recorded, deterioration due to flow becomes more remarkable.
【０００５】本発明の目的は、上記従来技術における問
題点を解決し、記録情報信号に対応した再生信号を確実
に得ることができる情報の記録媒体と記録方法および記
録装置を提供することにある。An object of the present invention is to solve the above-mentioned problems in the prior art and to provide an information recording medium, a recording method, and a recording apparatus capable of reliably obtaining a reproduced signal corresponding to a recorded information signal. .
【０００６】[0006]
【課題を解決するための手段】本発明では、レーザ光の
照射によって情報を記録あるいは書き換えが可能な記録
媒体を用いる。この記録媒体には、予めトラックアドレ
スなどの情報を凹凸のピットまたは相変化などによる記
録マークとして形成しているプリフォーマット領域があ
る。さらにこのプリフォーマット領域の他に、ギャップ
領域、ＶＦＯやＳＹＮＣ領域およびデータ領域などの記
録が可能な記録領域が確保されている。さらに、記録領
域の前後の少なくとも一方にダミー領域を設けている。
また、ダミー領域に接してモーターの回転ジッターのマ
ージンを見越したバッファー領域も設けている。ここ
で、このダミー領域を設けた目的の一つは、多数回の書
き換えにより記録膜の流動が起こったとしても再生信号
波形歪みがＶＦＯやＳＹＮＣ領域、あるいはダミー領
域、バッファー領域内に留まり、実際に読み出さなけれ
ばならないデータ領域の情報が損傷しないようにするた
めのものである。更に、ダミー領域は記録情報信号の書
き始め位置の最大シフト幅よりも長くした方が好まし
い。According to the present invention, a recording medium on which information can be recorded or rewritten by irradiating a laser beam is used. This recording medium has a preformat area in which information such as a track address is previously formed as a recording mark due to uneven pits or phase change. Further, in addition to the preformat area, a recordable area such as a gap area, a VFO or SYNC area, and a data area is secured. Further, a dummy area is provided at least before or after the recording area.
In addition, a buffer area is provided in contact with the dummy area to allow for a margin of motor rotation jitter. Here, one of the purposes of providing the dummy area is that even if the recording film flows due to rewriting many times, the reproduced signal waveform distortion remains in the VFO or SYNC area, or the dummy area or the buffer area. This is to prevent information in the data area that must be read out from being damaged. Further, it is preferable that the dummy area is longer than the maximum shift width of the write start position of the recording information signal.
【０００７】記録は、ＶＦＯやＳＹＮＣおよびデータな
どの目的の記録情報信号の前側あるいは後側の少なくと
も一方に、ダミーの信号を付加した信号を用いて行な
う。この場合、ダミー領域にはダミーの信号が主に記録
される。そして、ダミーの信号の平均エネルギーを、目
的の記録情報信号の平均エネルギーよりも小さくするこ
とにより、多数回書き換えによる記録膜の流動をダミー
領域で緩和させることができる。その結果、ダミーの信
号が記録されるダミー領域およびバッファー領域の一部
では流動による再生信号波形歪みを僅かに生じるが、目
的の信号が記録される記録領域には流動による影響がな
く、確実に目的の記録情報信号に対応した再生信号が得
られる。ここで、ダミーの信号の平均エネルギーを小さ
くする方法として、たとえば、単一周波数の信号をダミ
ーの信号とし、この信号のデューティー比を調節して小
さくすれば良い。マークエッジ記録方式の場合には、平
均デューティー比は５０％程度となるため、ダミーの信
号のデューティー比を５０％以下とすれば良い。またダ
ミーの信号のデューティー比を段階的または連続的に調
節することにより、ダミーの信号における平均エネルギ
ーを段階的または連続的に小さくしてもよい。あるいは
記録パワーを変化させても良い。このように記録波形の
各パルス幅や各パワーなどを変化させて平均エネルギー
を小さくすれば良いが、ダミーの信号のデューティー比
を変化させた方が装置を簡単にできて好ましい。また、
場合によっては、記録情報信号の前側あるいは後側のど
ちらか一方にのみダミーの信号を付加してもよい。[0007] Recording is performed using a signal obtained by adding a dummy signal to at least one of the front side and the rear side of a target recording information signal such as VFO, SYNC and data. In this case, a dummy signal is mainly recorded in the dummy area. Then, by making the average energy of the dummy signal smaller than the average energy of the target recording information signal, the flow of the recording film due to rewriting many times can be reduced in the dummy region. As a result, the reproduction signal waveform distortion due to the flow slightly occurs in the dummy area where a dummy signal is recorded and in a part of the buffer area, but the recording area where the target signal is recorded is not affected by the flow, and the reproduction signal is surely prevented. A reproduction signal corresponding to the target recording information signal is obtained. Here, as a method of reducing the average energy of the dummy signal, for example, a signal of a single frequency may be used as the dummy signal, and the duty ratio of the signal may be adjusted to reduce the average energy. In the case of the mark edge recording method, since the average duty ratio is about 50%, the duty ratio of the dummy signal may be set to 50% or less. The average energy of the dummy signal may be reduced stepwise or continuously by adjusting the duty ratio of the dummy signal stepwise or continuously. Alternatively, the recording power may be changed. As described above, the average energy may be reduced by changing each pulse width or each power of the recording waveform, but it is preferable to change the duty ratio of the dummy signal because the apparatus can be simplified. Also,
In some cases, a dummy signal may be added to only one of the front side and the rear side of the recording information signal.
【０００８】記録情報信号の書き始めをランダムにシフ
トして書き換えを行なうことにより、流動による再生信
号波形歪みの程度を小さくすることができる。この場合
には、最大シフト幅は付加するダミーの信号よりも短く
する方が好ましい。特に、ダミー信号の長さの１／２０
〜１／２程度が好ましい。The degree of distortion of the reproduced signal waveform due to the flow can be reduced by randomly rewriting the recording information signal by rewriting the start of writing. In this case, it is preferable that the maximum shift width be shorter than the dummy signal to be added. In particular, 1/20 of the length of the dummy signal
It is preferably about １ ／.
【０００９】本発明では、ダミーの信号のパターンに関
する情報などを、予め記録媒体上に記録している記録媒
体を用いる。例えば、これらの情報は記録媒体のコント
ロールデータ部に記録しておけばよい。In the present invention, a recording medium in which information relating to a dummy signal pattern is recorded in advance on a recording medium is used. For example, such information may be recorded in the control data section of the recording medium.
【００１０】本発明は、Ｇｅ-Ｓｂ-Ｔｅ系記録膜やＡｇ
-Ｉｎ-Ｓｂ-Ｔｅ系記録膜などの相変化を利用した記録
膜などを用いれば良いが、特に記録膜中に主成分材料よ
りも高融点であるＣｒＴｅやＡｇ2Ｔｅなどの高融点材
料を添加した記録膜、反射層を２層にした記録媒体など
を用いれば、流動による記録膜膜厚変化をさらに抑制す
ることができ好ましい。The present invention relates to a Ge—Sb—Te-based recording film and Ag
A recording film using a phase change such as a -In-Sb-Te-based recording film may be used. In particular, a high melting point material such as CrTe or Ag 2 Te which has a higher melting point than the main component material is used in the recording film. It is preferable to use a recording film to which the recording film is added, a recording medium having two reflective layers, or the like, because a change in the thickness of the recording film due to the flow can be further suppressed.
【００１１】本発明における記録は、レーザ光源、光学
系、自動焦点（ＡＦ）手段、トラッキング手段、再生信
号検出手段、コントロールデータ部の読み取り手段、記
録情報信号の前後の少なくとも一方に付加するダミーの
信号のパターンに関する情報を予め記録媒体上に記録し
ている記録媒体、ダミーの信号を記録情報信号の前後の
少なくとも一方に付加した信号を用い、前記記録媒体を
回転あるいは移動させる手段と、前記レーザ光源からの
レーザ光を前記記録媒体上に集光する手段と、記録すべ
き信号を変調符号に変換する信号変調手段と、記録符号
に対応した記録波形を発生させる記録波形生成手段と、
記録開始位置をランダムにシフトさせるための記録開始
位置制御手段、前記記録波形によって前記レーザ光源を
駆動するレーザ駆動手段、および前記記録媒体から反射
されたレーザ光を電気信号に変換する手段、前記電気信
号を２値波形変換する２値変換手段、前記２値信号を復
号して情報の信号とする手段を有する記録装置によって
実現できる。According to the present invention, the recording is performed by a laser light source, an optical system, an automatic focusing (AF) means, a tracking means, a reproduction signal detecting means, a reading means of a control data section, and a dummy added to at least one of before and after the recording information signal. Means for rotating or moving the recording medium by using a recording medium in which information relating to a signal pattern is previously recorded on the recording medium, a signal obtained by adding a dummy signal to at least one of before and after the recording information signal, and the laser Means for condensing laser light from a light source on the recording medium, signal modulation means for converting a signal to be recorded into a modulation code, and recording waveform generation means for generating a recording waveform corresponding to the recording code,
Recording start position control means for randomly shifting the recording start position, laser driving means for driving the laser light source by the recording waveform, means for converting laser light reflected from the recording medium into an electric signal, This can be realized by a recording apparatus having a binary conversion unit for converting a signal into a binary waveform, and a unit for decoding the binary signal to obtain an information signal.
【００１２】本発明に用いる記録膜としては、高速結晶
化が可能な結晶−非晶質相変化光記録膜や、非晶質−非
晶質間変化を利用する記録膜、結晶系や結晶粒径の変化
などの結晶−結晶間相変化記録膜および光磁気記録膜が
好ましいが、他の記録膜を用いてもよい。As the recording film used in the present invention, a crystal-amorphous phase-change optical recording film capable of high-speed crystallization, a recording film utilizing an amorphous-amorphous change, a crystal system and a crystal grain are used. A crystal-to-crystal phase change recording film such as a change in diameter and a magneto-optical recording film are preferred, but other recording films may be used.
【００１３】[0013]
【作用】本発明に用いる記録媒体には、プリフォーマッ
ト領域の他に、ギャップ領域、ＶＦＯやＳＹＮＣ領域お
よびデータ領域などの記録が可能な記録領域が確保され
ている。ここで、記録領域の前後の少なくとも一方にダ
ミー領域を設けているが、このダミー領域は、多数回の
書き換えによる記録膜の流動が生じても再生信号波形歪
みが、ＶＦＯやＳＹＮＣ領域あるいはダミー領域、バッ
ファー領域内に留まり、実際に読み出さなければならな
いデータ領域の情報が損傷しないようにするためもので
ある。The recording medium used in the present invention has a recording area such as a gap area, a VFO or SYNC area, and a data area in addition to the preformat area. Here, a dummy area is provided at least before and after the recording area. Even if the recording film flows due to rewriting many times, the reproduced signal waveform distortion causes a VFO or SYNC area or a dummy area. This is to prevent the information in the data area, which remains in the buffer area and must be actually read, from being damaged.
【００１４】これらの作用について、多数回の書き換え
により前方流動（レーザビームの進行方向と同じ方向へ
記録膜が流動する）が生じる記録媒体を用いた場合につ
いて説明する。ここで用いた記録媒体のセクターフォー
マットは、プリフォーマット領域、ギャップ領域、前部
ダミー領域、記録領域、後部ダミー領域、バッファー領
域の順で構成されている。記録領域は、ＶＦＯやＳＹＮ
Ｃ領域とデータ領域で構成されている。この時、記録開
始位置のシフト幅をダミー領域の長さよりも短くするこ
とにより、記録情報信号は確実に再生できる。この記録
媒体に多数回の書き換えを行なうと、流動が生じて記録
領域の始端部側から後端部側へ記録膜が移動していく。
その為に再生信号レベルが変化する。These operations will be described for a case where a recording medium is used which causes a forward flow (a recording film flows in the same direction as the laser beam travels) by rewriting many times. The sector format of the recording medium used here is composed of a preformat area, a gap area, a front dummy area, a recording area, a rear dummy area, and a buffer area in this order. The recording area is VFO or SYN
It is composed of a C area and a data area. At this time, the recording information signal can be reliably reproduced by setting the shift width of the recording start position shorter than the length of the dummy area. When the recording medium is rewritten many times, a flow occurs and the recording film moves from the start end side to the rear end side of the recording area.
Therefore, the reproduction signal level changes.
【００１５】この記録媒体では、記録膜の膜厚が薄くな
ると反射率は低下し、逆に記録膜の膜厚が厚くなると反
射率は上昇する。すなわち、記録膜が薄くなった始端部
側では反射率が下がり、記録膜が厚くなった後端部側で
は反射率が高くなる。その為に、始端部側および後端部
側では再生信号波形歪みとなりエラーが生じる。しか
し、本発明のように、ＶＦＯやＳＹＮＣおよびデータな
どの目的の情報信号の前側あるいは後側の少なくとも一
方に、ダミーの信号を付加し、ダミーの信号の平均エネ
ルギーを、目的の記録情報信号の平均エネルギーよりも
小さくすることにより、多数回書き換えによる記録膜の
流動をダミー領域で緩和させることができる。すなわ
ち、流動してきた記録膜を急激に止めるのではなく、徐
々に移動させるのである。そして、再生時は、目的の記
録情報信号と対応している記録領域の再生信号波形のみ
を再生する。これにより、ダミーの信号が記録されたダ
ミー領域やバッファー領域で流動が生じていても、目的
の記録領域には流動の影響は無く、確実に目的の記録情
報信号が再生できる。さらに、書き換え回数が増えても
記録情報信号からの再生信号波形には大きな歪みは生じ
にくい。In this recording medium, the reflectance decreases as the thickness of the recording film decreases, whereas the reflectance increases as the thickness of the recording film increases. That is, the reflectance decreases on the start end side where the recording film becomes thinner, and increases on the rear end side where the recording film becomes thicker. Therefore, the reproduced signal waveform is distorted on the start end side and the rear end side, and an error occurs. However, as in the present invention, a dummy signal is added to at least one of the front side and the rear side of the target information signal such as VFO, SYNC, and data, and the average energy of the dummy signal is reduced. By making the energy smaller than the average energy, the flow of the recording film due to rewriting many times can be reduced in the dummy region. That is, the flowing recording film is not stopped suddenly but is gradually moved. During reproduction, only the reproduction signal waveform of the recording area corresponding to the target recording information signal is reproduced. Thus, even if a flow occurs in the dummy area or the buffer area where the dummy signal is recorded, the flow is not affected in the target recording area, and the target recording information signal can be reliably reproduced. Further, even if the number of times of rewriting is increased, a large distortion is hardly generated in a reproduced signal waveform from the recorded information signal.
【００１６】ここで、ダミーの信号の平均エネルギーを
小さくする方法としては、たとえば、単一周波数の信号
をダミーの信号とし、この信号のデューティー比を小さ
くすれば良い。マークエッジ記録方式の場合には、平均
デューティー比は５０％程度となるため、ダミーの信号
のデューティー比を５０％以下とすれば良い。特に、前
方流動が生じるディスクの場合には、ダミーの信号のデ
ューティー比を２５％程度と更に小さくした方が良い。
また、ダミーの信号のデューティー比を段階的または連
続的に調節することにより、ダミーの信号における平均
エネルギーを段階的または連続的に小さくしてもよい。
あるいはパルス幅とパワーのどちらか一方を変化させて
もよい。Here, as a method of reducing the average energy of the dummy signal, for example, a signal of a single frequency may be used as the dummy signal and the duty ratio of this signal may be reduced. In the case of the mark edge recording method, since the average duty ratio is about 50%, the duty ratio of the dummy signal may be set to 50% or less. In particular, in the case of a disk in which forward flow occurs, it is better to further reduce the duty ratio of the dummy signal to about 25%.
The average energy of the dummy signal may be reduced stepwise or continuously by adjusting the duty ratio of the dummy signal stepwise or continuously.
Alternatively, one of the pulse width and the power may be changed.
【００１７】このように記録波形の各パルス幅や各パワ
ーなどを変化させて平均エネルギーを小さくすれば良い
が、ダミーの信号のデューティー比を変化させた方が装
置を簡単にできて好ましい。また、場合によっては、記
録情報信号の前側あるいは後側のどちらか一方にのみダ
ミーの信号を付加してもよい。この場合、流動にあまり
影響しない記録情報信号の前側にはダミーの信号を付加
しないで、後側だけ付加しても良い。As described above, the average energy may be reduced by changing each pulse width and each power of the recording waveform, but it is preferable to change the duty ratio of the dummy signal to simplify the apparatus. In some cases, a dummy signal may be added to only one of the front side and the rear side of the recording information signal. In this case, a dummy signal may not be added to the front side of the recording information signal that does not significantly affect the flow, but may be added only to the rear side.
【００１８】記録情報信号の書き始めをランダムにシフ
トして書き換えを行なうことにより、流動による再生信
号波形歪みの程度を小さくすることができる。この場合
には、最大シフト幅は付加するダミーの信号よりも短く
する方が好ましい。特に、ダミー信号の長さの１／２０
〜１／２程度が好ましい。The degree of distortion of the reproduced signal waveform due to the flow can be reduced by randomly rewriting the start of writing of the recording information signal and performing rewriting. In this case, it is preferable that the maximum shift width be shorter than the dummy signal to be added. In particular, 1/20 of the length of the dummy signal
It is preferably about １ ／.
【００１９】本発明では、ダミーの信号のパターンに関
する情報などを、予め記録媒体のコントロールデータ部
などに記録している記録媒体を用いる。Ｇｅ-Ｓｂ-Ｔｅ
系記録膜やＡｇ-Ｉｎ-Ｓｂ-Ｔｅ系記録膜などの相変化
を利用した記録膜、さらに記録膜中に主成分の材料より
も高融点であるＣｒＴｅやＡｇ2Ｔｅなどの高融点材料
を添加した記録膜や、反射層を２層にした記録媒体を用
いることにより、従来のディスクに比べて流動による記
録膜膜厚変化を大幅に抑制することができ好ましい。In the present invention, a recording medium is used in which information relating to a dummy signal pattern is recorded in advance in a control data section or the like of the recording medium. Ge-Sb-Te
System recording film or Ag-In-Sb-Te based recording film recording layer using a phase change, such as, a refractory material such as CrTe or Ag 2 Te is more refractory than the material of the main component in the recording film The use of the added recording film or a recording medium having two reflective layers is preferable because a change in the thickness of the recording film due to the flow can be greatly suppressed as compared with a conventional disk.
【００２０】本発明における記録は、レーザ光源、光学
系、自動焦点（ＡＦ）手段、トラッキング手段、再生信
号検出手段、コントロールデータ部の読み取り手段、記
録情報信号の前後の少なくとも一方に付加するダミーの
信号のパターンに関する情報を予め記録媒体上に記録し
ている記録媒体、ダミーの信号を記録情報信号の前後の
少なくとも一方に付加した信号を用い、前記記録媒体を
回転あるいは移動させる手段と、前記レーザ光源からの
レーザ光を前記記録媒体上に集光する手段と、記録すべ
き信号を変調符号に変換する信号変調手段と、記録符号
に対応した記録波形を発生させる記録波形生成手段と、
記録開始位置をランダムにシフトさせるための記録開始
位置制御手段、前記記録波形によって前記レーザ光源を
駆動するレーザ駆動手段、および前記記録媒体から反射
されたレーザ光を電気信号に変換する手段、前記電気信
号を２値波形変換する２値変換手段、前記２値信号を復
号して情報の信号とする手段を少なくとも有する記録装
置によって実現できる。In the present invention, the recording is performed by a laser light source, an optical system, an automatic focusing (AF) means, a tracking means, a reproduction signal detection means, a reading means of a control data section, and a dummy added to at least one of before and after the recording information signal. Means for rotating or moving the recording medium by using a recording medium in which information relating to a signal pattern is previously recorded on the recording medium, a signal obtained by adding a dummy signal to at least one of before and after the recording information signal, and the laser Means for condensing laser light from a light source on the recording medium, signal modulation means for converting a signal to be recorded into a modulation code, and recording waveform generation means for generating a recording waveform corresponding to the recording code,
Recording start position control means for randomly shifting the recording start position, laser driving means for driving the laser light source by the recording waveform, means for converting laser light reflected from the recording medium into an electric signal, The present invention can be realized by a recording apparatus having at least a binary conversion unit for converting a signal into a binary waveform, and a unit for decoding the binary signal to obtain an information signal.
【００２１】また、本発明は、ディスク状のみならず、
カード状などの他の形態の記録媒体にも適用可能であ
る。Further, the present invention is not limited to a disk shape,
The present invention is also applicable to other forms of recording medium such as a card.
【００２２】[0022]
【実施例】以下、本発明の実施例を詳細に説明する。Embodiments of the present invention will be described below in detail.
【００２３】図１は、本実施例に用いたディスクの構造
断面図を示したものである。まず、直径５インチ、厚さ
０.６ｍｍの連続サーボ用ポリカーボネイト基板１上
に、マグネトロンスパッタ法によって、まず厚さ約１２
５ｎｍのＺｎＳ−ＳｉＯ2誘電体層層２を形成した。次
にＺｎＳ−ＳｉＯ2誘電体層２上にＣｒ5Ｇｅ20Ｓｂ20Ｔ
ｅ55の記録膜３を約３０ｎｍの厚さに形成した。この上
にＺｎＳ−ＳｉＯ2誘電体層４を約２０ｎｍの膜厚に形
成した。更に、この上にＳｉ層５を約１００ｎｍの膜厚
に形成した後、Ａｌ−Ｔｉ合金反射層６を約１００ｎｍ
形成した。これらの膜形成は同一のスパッタリング装置
内で順次行った。その後、この上に紫外線硬化樹脂層７
を塗布した後、ホットメルト接着剤８で保護板９との密
着張り合わせを行った。ここで、保護板９の変わりに、
前記ポリカーボネイト基板１から紫外線硬化樹脂層７ま
で形成した他の基板との密着張り合わせを行うことによ
り、記録容量２倍の張り合わせディスクが得られる。FIG. 1 is a sectional view showing the structure of a disk used in this embodiment. First, on a polycarbonate substrate 1 for continuous servo having a diameter of 5 inches and a thickness of 0.6 mm, a thickness of about 12 mm was formed by magnetron sputtering.
A 5 nm ZnS-SiO2 dielectric layer 2 was formed. Next, Cr5Ge20Sb20T is formed on the ZnS-SiO2 dielectric layer 2.
A recording film 3 of e55 was formed to a thickness of about 30 nm. On this, a ZnS-SiO2 dielectric layer 4 was formed to a thickness of about 20 nm. Further, after an Si layer 5 is formed thereon to a thickness of about 100 nm, an Al—Ti alloy reflective layer 6 is formed to a thickness of about 100 nm.
Formed. These films were formed sequentially in the same sputtering apparatus. After that, an ultraviolet curable resin layer 7
After the application, was adhered to the protective plate 9 with the hot melt adhesive 8. Here, instead of the protection plate 9,
By performing close bonding with another substrate formed from the polycarbonate substrate 1 to the ultraviolet curable resin layer 7, a bonded disk having twice the recording capacity can be obtained.
【００２４】図２は、本実施例に用いた基板のセクター
フォーマットの一例を示したものである。予めセクター
アドレスやトラックアドレスなどの情報を凹凸のピット
として形成しているプリフォーマット領域１０がある。
この再生専用のプリフォーマット領域１０の他に、ギャ
ップ領域１１、ＶＦＯやＳＹＮＣ領域１２およびデータ
領域１３などの記録（書き換えを含む）が可能な記録領
域１４が確保されている。この記録領域１４は、グルー
ブ部に設けている。また、本実施例では、記録領域の前
後にダミー領域１５、１６を設けている。さらに、記録
領域の後側のダミー領域１６の後に、回転ジッターによ
るマージンの為のバッファー領域１７も設けている。こ
のダミー領域１５、１６は、多数回の書き換えにより記
録膜の流動が起こったとしても、記録領域よりも前側の
領域では、流動による再生信号波形歪みが前側のダミー
領域１５までで留まり、記録領域よりも後側の領域で
は、流動による再生信号波形歪みが後部ダミー領域１６
までで留まり、実際に読み出さなければならないデータ
領域１３の情報が損傷しないようにする働きをする。こ
こで、ダミー領域１５、１６は、記録信号の書き始め位
置の最大シフト幅よりも長くし、流動による記録膜膜厚
変化の大きい後側のダミー領域１６の方を前側のダミー
領域１５よりも長くしている。場合によっては、流動抑
制の為のダミー領域は、前側あるいは後側のどちらか一
方のみでも良い。FIG. 2 shows an example of the sector format of the substrate used in this embodiment. There is a preformat area 10 in which information such as a sector address and a track address is previously formed as uneven pits.
In addition to the read-only preformat area 10, a recording area 14 capable of recording (including rewriting) such as a gap area 11, a VFO or SYNC area 12, and a data area 13 is secured. This recording area 14 is provided in the groove portion. In this embodiment, dummy areas 15 and 16 are provided before and after the recording area. Further, after the dummy area 16 on the rear side of the recording area, a buffer area 17 for a margin due to rotational jitter is provided. In the dummy areas 15 and 16, even if the recording film flows due to a large number of rewrites, in the area ahead of the recording area, the reproduction signal waveform distortion due to the flow stops at the front dummy area 15, and the recording area In the region behind the reproduced signal waveform distortion due to the flow, the rear dummy region 16
This serves to prevent the information in the data area 13 that must be actually read from being damaged. Here, the dummy regions 15 and 16 are longer than the maximum shift width of the write start position of the recording signal, and the rear dummy region 16 in which the change in the recording film thickness due to the flow is larger than the front dummy region 15. It is long. In some cases, the dummy region for suppressing the flow may be only one of the front side and the rear side.
【００２５】記録は、ＶＦＯやＳＹＮＣおよびデータな
ど目的の記録情報信号の前側あるいは後側の少なくとも
一方に、ダミー信号を付加した信号で行えば良いが、本
実施例では、ダミーの信号を３０Ｔ（１Ｔ：９０ｎｓ）
の時間だけ記録情報信号の両側に付加した。さらに、記
録開始位置をダミーの信号の１／２である１５Ｔの範囲
内でランダムにシフトさせた。この場合、ダミー領域に
はダミーの信号が主に記録される。また、多数回の書き
換えによる記録膜の流動を緩和させるために、ダミーの
信号の平均エネルギーを、目的の記録情報信号の平均エ
ネルギーよりも小さくしている。すなわち、流動を徐々
に進行させるようにした。実際には、単一周波数（記録
パルス周期：４Ｔ）の信号をダミーの信号とし、この信
号のデューティー比を小さくした。マークエッジ記録方
式による記録の場合には、単一周波数で記録を行った場
合の平均エネルギーに置き換えると、デューティー比５
０％とほぼ同程度となるため、ダミーの信号のデューテ
ィー比は５０％以下が好ましいが、本実施例で用いたデ
ィスクは、多数回の書き換えにより記録膜がレーザビー
ムの方向と同じ方向へ流動する（前方流動）ため、デュ
ーティー比を２５％程度と小さくした。これにより、記
録膜の流動を大幅に緩和することができ、記録パワーマ
ージンが拡がった。また、ダミーの信号の平均エネルギ
ーを段階的または連続的に調節することによりダミーの
信号の平均エネルギーを段階的または連続的に小さくし
ても良い。この他、ダミーの信号の平均エネルギーを小
さくする方法としては、記録パルス幅や記録パワーレベ
ルなど（エネルギー量）をディスク構造に応じて制御
（立ち下げパルス波形も含む）すれば同様な効果が得ら
れる。しかしダミーの信号のデューティー比を変化させ
た方が記録装置を簡単に出きる点では好ましい。また、
場合によっては、記録情報信号の前側あるいは後側のど
ちらか一方のみに付加してもよい。たとえば、記録膜の
流動が生じる領域が比較的狭い記録情報信号の前側に
は、ダミー信号を付加しなくてもよい。Recording may be performed with a signal in which a dummy signal is added to at least one of the front side and the rear side of a target recording information signal such as VFO, SYNC, and data. In the present embodiment, the dummy signal is set to 30T ( 1T: 90 ns)
At the same time on both sides of the recording information signal. Further, the recording start position was randomly shifted within a range of 15T which is 1/2 of the dummy signal. In this case, a dummy signal is mainly recorded in the dummy area. Further, in order to reduce the flow of the recording film due to rewriting many times, the average energy of the dummy signal is made smaller than the average energy of the target recording information signal. That is, the flow was gradually advanced. Actually, a signal of a single frequency (recording pulse period: 4T) is used as a dummy signal, and the duty ratio of this signal is reduced. In the case of recording by the mark edge recording method, if the average energy when recording is performed at a single frequency is replaced with the duty ratio of 5
The duty ratio of the dummy signal is preferably 50% or less because it is almost the same as 0%. However, in the disk used in this embodiment, the recording film flows in the same direction as the direction of the laser beam by rewriting many times. (Forward flow), the duty ratio was reduced to about 25%. As a result, the flow of the recording film could be greatly reduced, and the recording power margin was widened. Also, the average energy of the dummy signal may be reduced stepwise or continuously by adjusting the average energy of the dummy signal stepwise or continuously. In addition, as a method of reducing the average energy of the dummy signal, a similar effect can be obtained by controlling the recording pulse width and recording power level (energy amount) according to the disk structure (including the falling pulse waveform). Can be However, it is preferable to change the duty ratio of the dummy signal from the viewpoint that the recording device can be easily exited. Also,
In some cases, it may be added to only one of the front side and the rear side of the recording information signal. For example, it is not necessary to add a dummy signal in front of a recording information signal in which a region where the recording film flows is relatively narrow.
【００２６】さらに記録開始位置のシフト幅を種々変え
て書き換えを行なったところ、記録情報信号の書き始め
位置をダミーの信号の１／２０〜１／２程度の範囲でシ
フトさせることにより、流動による再生信号波形歪みを
小さくできた。Further, when rewriting is performed by changing the shift width of the recording start position in various ways, the writing start position of the recording information signal is shifted in a range of about 1/20 to 1/2 of the dummy signal, so The reproduction signal waveform distortion was reduced.
【００２７】本実施例に用いたディスクのコントロール
データ部には、ダミーの信号のパターンに関する情報
（例えば、ダミー信号により記録された平均記録マーク
長が記録マーク間の平均スペース長よりも短くなるパタ
ーン、あるいは単一周波数からなるパターンなど）が予
め凹凸のピットとして記録されており、この情報に従っ
て記録を行なった。また、ＣｒＴｅなどの高融点材料を
添加していないＧｅ-Ｓｂ-Ｔｅ系記録膜やＡｇ-Ｉｎ-Ｓ
ｂ-Ｔｅ系記録膜においても、このようなダミー信号を
付加した記録波形を用いることにより流動抑制の効果は
あったが、ＣｒＴｅやＡｇ2Ｔｅなどの高融点材料を添
加した記録膜の方が流動を緩和するための記録パワーマ
ージンが大きくて好ましい。The control data portion of the disk used in the present embodiment contains information on a dummy signal pattern (for example, a pattern in which the average recording mark length recorded by the dummy signal is shorter than the average space length between recording marks). Or a pattern having a single frequency) is recorded in advance as uneven pits, and recording was performed according to this information. Also, a Ge—Sb—Te based recording film to which a high melting point material such as CrTe is not added or Ag—In—S
The b-Te recording film also has the effect of suppressing flow by using a recording waveform to which such a dummy signal is added, but the recording film to which a high melting point material such as CrTe or Ag 2 Te is added is more effective. A large recording power margin for alleviating the flow is preferable.
【００２８】図３は、本実施例の記録再生装置における
記録再生系の構成図の一例を示したものである。まず記
録時は、記録媒体に記録されているコントロールデータ
を読み取り、それに基づき記録すべき原信号（情報）を
変調器１８に入力して、使用する変調符号に変換する。
そして、目的の記録符号に対応した記録波形を記録波形
生成器１９により生成し、種々のパワーの記録パルス信
号として出力される。そして、記録開始位置をランダム
にシフトさせるための記録開始位置制御器２０を経て、
レーザ駆動器２１が半導体レーザ２２の駆動電流を変調
して、光学ヘッド２３を通って回転しているディスク２
４上にレーザ光を集光して照射し、記録マークを形成す
る。再生時は、ディスク２４の目的のアドレスから反射
されたレーザ光が受光器２５に取り込まれ電気信号に変
換される。そしてこの電気信号は再生信号増幅器２６を
通って波形等化器２７に入力される。波形等化器２７を
出た信号は、２値波形に変換される。最終的には、２値
信号を弁別器２８、復号器２９によりデータビット列
（情報）となる。FIG. 3 shows an example of a configuration diagram of a recording / reproducing system in the recording / reproducing apparatus of the present embodiment. First, at the time of recording, control data recorded on a recording medium is read, and an original signal (information) to be recorded is input to the modulator 18 based on the read control data and converted into a modulation code to be used.
Then, a recording waveform corresponding to the target recording code is generated by the recording waveform generator 19 and output as recording pulse signals of various powers. Then, via a recording start position controller 20 for randomly shifting the recording start position,
The laser driver 21 modulates the drive current of the semiconductor laser 22 to rotate the disk 2 rotating through the optical head 23.
A laser beam is condensed and irradiated on the substrate 4 to form a recording mark. At the time of reproduction, the laser light reflected from the target address of the disk 24 is taken into the light receiver 25 and converted into an electric signal. This electric signal is input to the waveform equalizer 27 through the reproduction signal amplifier 26. The signal output from the waveform equalizer 27 is converted into a binary waveform. Finally, the binary signal is converted into a data bit string (information) by the discriminator 28 and the decoder 29.
【００２９】本実施例では、連続サーボ方式の例を示し
たが、サンプルサーボ方式でも同様な効果が得られた。In this embodiment, an example of the continuous servo system has been described, but the same effect can be obtained with the sample servo system.
【００３０】[0030]
【発明の効果】本発明によれば、記録領域の少なくとも
一方にダミー領域を有する記録媒体を用い、ダミーの信
号を、記録情報信号の前後の少なくとも一方に付加した
信号で情報の記録を行うことにより、記録領域は多数回
の書き換えによる記録膜の流動の影響を受けないため、
目的の記録情報を確実に再生できた。According to the present invention, using a recording medium having a dummy area in at least one of the recording areas, information is recorded by a signal in which a dummy signal is added to at least one of before and after a recording information signal. Therefore, the recording area is not affected by the flow of the recording film due to multiple rewritings,
The target recorded information could be reproduced reliably.
【図１】実施例におけるディスク構造の断面図。FIG. 1 is a sectional view of a disk structure according to an embodiment.
【図２】実施例におけるセクターフォーマットの一例の
概念図。FIG. 2 is a conceptual diagram illustrating an example of a sector format according to the embodiment.
【図３】実施例に用いた情報の記録装置の構成図。FIG. 3 is a configuration diagram of an information recording device used in an embodiment.
１…ポリカーボネート基板、２…ＺｎＳ−ＳｉＯ2誘電
体層、３…記録膜（Ｃｒ5Ｇｅ20Ｓｂ20Ｔｅ55）、４…
ＺｎＳ−ＳｉＯ2誘電体層、５…Ｓｉ反射層、６…Ａｌ
Ｔｉ合金反射層、７…紫外線硬化樹脂保護層、８…ホッ
トメルト接着層、９…保護板、１０…プリフォーマット
領域、１１…ギャップ領域、１２…ＶＦＯとＳＹＮＣ領
域、１３…データ領域、１４…記録領域、１５…前側の
ダミー領域、１６…後側のダミー領域、１７…回転ジッ
ターマージン用のバッファー領域、１８…変調器、１９
…記録波形生成器、２０…記録開始位置制御器、２１…
レーザ駆動器、２２…半導体レーザ、２３…光学ヘッ
ド、２４…ディスク、２５…受光器、２６…再生信号増
幅器、２７…波形等化器、２８…弁別器、２９…復号
器。DESCRIPTION OF SYMBOLS 1 ... Polycarbonate substrate, 2 ... ZnS-SiO2 dielectric layer, 3 ... Recording film (Cr5Ge20Sb20Te55), 4 ...
ZnS-SiO2 dielectric layer, 5 ... Si reflective layer, 6 ... Al
Ti alloy reflective layer, 7: UV curable resin protective layer, 8: hot melt adhesive layer, 9: protective plate, 10: preformat area, 11: gap area, 12: VFO and SYNC area, 13: data area, 14 ... Recording area, 15: front dummy area, 16: rear dummy area, 17: buffer area for rotational jitter margin, 18: modulator, 19
... Recording waveform generator, 20 ... Recording start position controller, 21 ...
Laser driver, 22 semiconductor laser, 23 optical head, 24 disk, 25 light receiver, 26 reproduced signal amplifier, 27 waveform equalizer, 28 discriminator, 29 decoder.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 廣常 朱美 東京都国分寺市東恋ケ窪１丁目280番地 株式会社日立製作所中央研究所内 (72)発明者 峯邑 浩行 東京都国分寺市東恋ケ窪１丁目280番地 株式会社日立製作所中央研究所内 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Akemi Hirone 1-280 Higashi Koikekubo, Kokubunji-shi, Tokyo Inside the Hitachi, Ltd. Central Research Laboratory Co., Ltd. Inside the Central Research Laboratory
Claims (16)
録が可能な情報の記録媒体において、記録情報信号の前
後の少なくとも一方に付加するダミーの信号のパターン
に関する情報を、予め記録媒体上に記録していることを
特徴とする情報の記録媒体。An information recording medium on which information can be recorded by irradiating an energy beam, information on a dummy signal pattern to be added to at least one of before and after a recording information signal is recorded on the recording medium in advance. Recording media for information.
上記のダミー信号のパターンに関する情報を、予め記録
媒体上のコントロールデータ部に記録していることを特
徴とする情報の記録媒体。2. The information recording medium according to claim 1, wherein:
An information recording medium characterized in that the information on the pattern of the dummy signal is recorded in a control data section on the recording medium in advance.
録が可能な情報の記録媒体において、記録すべき情報信
号の前後の少なくとも一方に付加されたダミーの信号に
より記録されるダミー領域を設けていることを特徴とす
る情報の記録媒体。3. An information recording medium on which information can be recorded by irradiating an energy beam, wherein a dummy area recorded by a dummy signal added to at least one of before and after an information signal to be recorded is provided. An information recording medium characterized by the following.
媒体において、Ｇｅ-Ｓｂ-Ｔｅ系記録膜、Ａｇ-Ｉｎ-Ｓ
ｂ-Ｔｅ系記録膜などの相変化を利用した記録膜を用い
たことを特徴とする情報の記録媒体。4. The information recording medium according to claim 1, wherein the recording medium is a Ge—Sb—Te based recording film,
An information recording medium using a recording film utilizing a phase change, such as a b-Te recording film.
ＣｒＴｅやＡｇ2Ｔｅなどの高融点材料を含んだ記録膜
を用いたことを特徴とする情報の記録媒体。5. The information recording medium according to claim 4, wherein
An information recording medium characterized by using a recording film containing a high melting point material such as CrTe or Ag 2 Te.
媒体において、基板上に保護層、記録膜、保護層、第１
反射層、第２反射層の順で積層したことを特徴とする情
報の記録媒体。6. The information recording medium according to claim 1, wherein a protective layer, a recording film, a protective layer,
An information recording medium, wherein a reflective layer and a second reflective layer are laminated in this order.
媒体において、ダミー信号により記録された平均記録マ
ーク長が記録マーク間の平均スペース長よりも短くなる
パターンがコントロールデータ部に書かれていることを
特徴とする情報の記録媒体。7. The information recording medium according to claim 1, wherein a pattern in which the average recording mark length recorded by the dummy signal is shorter than the average space length between recording marks is written in the control data portion. A recording medium for information characterized by the fact that:
単一周波数からなるダミー信号のパターンがコントロー
ルデータ部に書かれていることを特徴とする情報の記録
媒体。8. The information recording medium according to claim 7, wherein:
An information recording medium, characterized in that a pattern of a dummy signal having a single frequency is written in a control data section.
録が可能な情報の記録方法において、ダミーの信号を、
記録媒体のコントロールデータ部に書かれている情報に
従い、記録情報信号の前後の少なくとも一方に付加して
情報の記録を行うことを特徴とする情報の記録方法。9. An information recording method capable of recording information by irradiating an energy beam, wherein a dummy signal is
An information recording method characterized by adding information to at least one of before and after a recording information signal to record information according to information written in a control data section of a recording medium.
て、ダミーの信号の平均エネルギーが、目的の記録情報
信号の平均エネルギーよりも小さいことを特徴とする情
報の記録方法。10. The information recording method according to claim 9, wherein the average energy of the dummy signal is smaller than the average energy of the target recording information signal.
て、ダミーの信号は単一周波数からなり、その信号のデ
ューティー比の調節により、ダミーの信号の平均エネル
ギーを目的の記録情報信号の平均エネルギーよりも小さ
くすることを特徴とする情報の記録方法。11. The information recording method according to claim 10, wherein the dummy signal has a single frequency, and the average energy of the dummy signal is reduced by adjusting the duty ratio of the signal. A method for recording information, characterized in that the information is made smaller.
て、ダミーの信号のデューティー比を段階的または連続
的に調節することにより、ダミーの信号の平均エネルギ
ーを段階的または連続的に小さくすることを特徴とする
情報の記録方法。12. The information recording method according to claim 11, wherein the average energy of the dummy signal is reduced stepwise or continuously by adjusting the duty ratio of the dummy signal stepwise or continuously. Recording method of information characterized by the following.
て、ダミーの信号を付加した記録情報信号の記録開始位
置をランダムにシフトさせて記録を行うことを特徴とす
る情報の記録方法。13. The information recording method according to claim 9, wherein a recording start position of a recording information signal to which a dummy signal is added is randomly shifted for recording.
て、記録開始位置の最大シフト幅がダミーの信号の長さ
よりも短いことを特徴とする情報の記録方法。14. The information recording method according to claim 13, wherein the maximum shift width of the recording start position is shorter than the length of the dummy signal.
て、記録開始位置の最大シフト幅がダミーの信号の長さ
の１／２０〜１／２程度であることを特徴とする情報の
記録方法。15. The information recording method according to claim 14, wherein the maximum shift width of the recording start position is about 1/20 to 1/2 of the length of the dummy signal. .
記録が可能な情報の記録装置において、レーザ光源、光
学系、自動焦点（ＡＦ）手段、トラッキング手段、再生
信号検出手段、コントロールデータ部の読み取り手段、
記録情報信号の前後の少なくとも一方に付加するダミー
の信号のパターンに関する情報を予め記録媒体上に記録
している記録媒体、ダミーの信号を記録情報信号の前後
の少なくとも一方に付加した信号を用い、前記記録媒体
を回転あるいは移動させる手段と、前記レーザ光源から
のレーザ光を前記記録媒体上に集光する手段と、記録す
べき信号を変調符号に変換する信号変調手段と、記録符
号に対応した記録波形を発生させる記録波形生成手段
と、記録開始位置をランダムにシフトさせるための記録
開始位置制御手段、前記記録波形によって前記レーザ光
源を駆動するレーザ駆動手段、および前記記録媒体から
反射されたレーザ光を電気信号に変換する手段、前記電
気信号を２値波形変換する２値変換手段、前記２値信号
を復号して情報の信号とする手段を少なくとも有するこ
とを特徴とする情報の記録装置。16. An information recording apparatus capable of recording information by irradiating an energy beam, comprising: a laser light source, an optical system, an automatic focus (AF) unit, a tracking unit, a reproduction signal detection unit, a control data unit reading unit,
A recording medium in which information on a pattern of a dummy signal to be added to at least one of before and after the recording information signal is recorded on a recording medium in advance, using a signal obtained by adding a dummy signal to at least one of before and after the recording information signal, Means for rotating or moving the recording medium, means for condensing laser light from the laser light source on the recording medium, signal modulation means for converting a signal to be recorded into a modulation code, and corresponding to the recording code. Recording waveform generating means for generating a recording waveform, recording start position control means for randomly shifting a recording start position, laser driving means for driving the laser light source by the recording waveform, and laser reflected from the recording medium Means for converting light into an electric signal, binary conversion means for converting the electric signal into a binary waveform, and decoding of the binary signal to transmit information. Recording device information, characterized in that it comprises at least a means to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31563098A JP3251553B2 (en) | 1995-07-21 | 1998-11-06 | Recording medium of information, recording method and recorder |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7185294A JPH0935275A (en) | 1995-07-21 | 1995-07-21 | Recording medium, recording method and recording device for information |
| JP31563098A JP3251553B2 (en) | 1995-07-21 | 1998-11-06 | Recording medium of information, recording method and recorder |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7185294A Division JPH0935275A (en) | 1995-07-21 | 1995-07-21 | Recording medium, recording method and recording device for information |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000211982A Division JP3330124B2 (en) | 1995-07-21 | 2000-07-07 | Information recording medium, recording method and recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11219527A true JPH11219527A (en) | 1999-08-10 |
| JP3251553B2 JP3251553B2 (en) | 2002-01-28 |
Family
ID=16168349
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7185294A Pending JPH0935275A (en) | 1995-07-21 | 1995-07-21 | Recording medium, recording method and recording device for information |
| JP31563098A Expired - Lifetime JP3251553B2 (en) | 1995-07-21 | 1998-11-06 | Recording medium of information, recording method and recorder |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7185294A Pending JPH0935275A (en) | 1995-07-21 | 1995-07-21 | Recording medium, recording method and recording device for information |
Country Status (1)
| Country | Link |
|---|---|
| JP (2) | JPH0935275A (en) |
-
1995
- 1995-07-21 JP JP7185294A patent/JPH0935275A/en active Pending
-
1998
- 1998-11-06 JP JP31563098A patent/JP3251553B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0935275A (en) | 1997-02-07 |
| JP3251553B2 (en) | 2002-01-28 |
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