JP4131136B2 - Information recording method and apparatus for optical disc - Google Patents

Description

【００３０】
この（１）式中、「r_start」は最初のフェーズ「Phase_int」の記録開始ブロックのディスク上における半径（記録開始半径）を表し、「pi」は円周率を表し、「Track_Pitch」は記録するディスクフォーマットに準ずるトラックピッチを表す。また、「r_base」は、ディスクフォーマットに準ずるユーザ情報５４Ａの開始ブロックの半径位置を表し、「θ」はこのユーザ情報５４Ａの開始ブロックの極座標変換の角度基準から何ラジアン進んだ所に「r_start」が存在しているかを示している。
【００３１】
以上のような（１）式に諸条件を代入するとともに、（残留記録長さ−記録可能な長さ）≧０を満足するように、設定ビーム数に対する実行ビーム数「EffectiveBeam_number」の最大値を求める。残留記録長さは、ユーザ情報５４Ａに相当するトラック長さから既に記録した分を除いたものである。前記不等式は１回のフェーズで記録可能なトラックの長さが残留記録長さよりも少ないことを意味する。このような場合は、できる限り多数のビームを使用して情報記録を行うほうが効率的である。
【００３２】
なお、記録可能なトラック長さを単位ブロック長で割って余りが生じた場合は、繰上げまたは繰り下げを行う。ブロック単位で情報を記録することから、このような処理を行う。この場合、繰り上げ又は繰り下げられたブロック数に対して残留ブロック数が小さい場合は、この残留ブロック数を使用する。例えば、光ディスクに既に情報が記録されており、残りの記録可能な容量が少ないような場合が該当する。
【００３３】
以上のようにして、最初のフェーズ「Phase_int」における記録開始ブロック番号から記録終了ブロック番号が決定される。なお、最初のフェーズの開始ポインタＰＦ０は、図２に示すようにユーザ情報５４Ａの開始点であるが、最初のフェーズにおけるブロック数，すなわち最初のフェーズで記録される情報量が決定されることから、結果的に、次のフェーズの開始ポインタＰＦ１が決定されることになる。
【００３４】
「Phase_Aの場合」……このフェーズにおける情報の記録可能なトラックの長さは、次の（２）式で表される。図４中に実線Ｌ10，Ｌ11，Ｌ12で示すトラック長さの合計が、この（２）式に対応する。
【数２】

【００３５】
この（２）式に諸条件を代入するともに、（残留記録長−記録可能な長さ）≧０を満足する設定ビーム内で、実行ビーム数の最大値を求める。この場合も、前記最初のフェーズの場合と同様に、記録可能な長さを一つのブロック長で割って、余りが生じた場合は、繰上げ又は繰り下げを行う。また、繰り上げ又は繰り下げしたブロック数に対して残留ブロック数が小さい場合は、この残留ブロック数を使用する。このような操作により、後続するフェーズの記録開始ブロック番号から今回のフェーズの記録終了ブロック番号が決定される。これにより、今回のフェーズによって記録されるブロック数が決まるので、結果的に、次のフェーズの記録開始ポインタＰＦ２が決まることになる。この動作を繰り返し行うことで、次に継続するフェーズの記録開始ポインタを順次決定することができる。
【００３６】
＜ビーム割振りポインタの設定＞……１つのフェーズ内で、どの情報をいずれのビームで記録するかを示すビーム割振りポインタの設定手順について説明する。実行ビーム数の選定方法としては、図５（Ａ）及び（Ｂ）にそれぞれ示すように、２通りの方法が考えられる。まず、同図（Ａ）の方法は、レファレンスビームＮを基準としたとき、同じ半径にビームが２つ存在する場合（選択可能なビームが複数存在する場合）は、ディスク外側のビームを優先して選択する方法である。例えば、実行ビーム数が「２」の場合、レファレンスビームＮの外側のビームＮ＋１が選択されるという具合である。一方、同図（Ｂ）の方法は、逆に、ディスク内側のビームを優先して選択する方法である。例えば、実行ビーム数が「２」の場合、レファレンスビームＮの内側のビームＮ−１が選択されるという具合である。但し、設定ビーム数が「３」で間欠トラック数が「０」の場合は、同図（Ｂ）の方法しか使用できない。それは、（Ｂ）の方法でないと、情報の書き繋ぎがうまくいかないからである。以下の説明では、同図（Ａ）の方法を使用するものとする。
【００３７】
ユーザ情報５４Ａの各フェーズで記録可能な領域をビーム毎に割り振るために設定するビーム割振りポインタのうち、ビームＢ０の記録開始位置を示すポインタをＰＢ０，レファレンスビームＢ１Ｒの記録開始位置を示すポインタをＰＢ１，ビームＢ２の記録開始位置を示すポインタをＰＢ２とする。そして、トラック・ジャンプ後の前記ロック・タイム終了時点を基準とする。ただし、最初のフェーズの場合は、記録開始位置に複数の実行ビームのうちの最内周のビームが一致した時点を基準とする。
【００３８】
「Phase_intの場合」
（１）実行ビーム数＝１の場合は、レファレンス・ビームＢ１Ｒで、そのフェーズのすべての情報を書き込む。この場合、割振りポインタは、ＰＢ１のみが設定され、ＰＢ０及びＰＢ２は設定されない。割振りポインタＰＢ１は、当該フェーズの記録開始ポインタの位置と一致する。
【００３９】
（２）実行ビーム数＝２の場合は、図５（Ａ）に示したように外側のビームが選択されるので、レファレンスビームＢ１Ｒと、外側のビームＢ２が選択される。これらのうち、レファレンスビームＢ１Ｒの割振りポインタＰＢ１は、当該フェーズの記録開始ポインタの位置と一致する。外側のビームＢ２が記録を開始するブロックは、次の（３）式から求められる。この（３）式の計算結果を予めテーブルとして準備し、瞬時にその極座標値が分かるようにすると好都合である。
【数３】

【００４０】
この値から、時間軸上の遅れ方向であって、最も近いブロックをビームＢ２で記録を開始するブロックとする。記録開始ブロックが特定されると、ユーザ情報５４Ａ上におけるビームＢ２の記録開始位置が判明し、これがビームＢ２の割振りポインタＰＢ２となる。ビームＢ０は使用しないので、その割振りポインタＰＢ０は設定されない。
【００４１】
（３）実行ビーム数＝３の場合、ビームＢ０が当該フェーズの記録開始ブロックに一致したときに、ビームＢ１Ｒ，Ｂ２がどのような極座標位置になるかは、次の（４）式から求められる。この場合も、同様に予め計算結果をテーブルとして準備し、これから読み込むようにすると都合がよい。
【数４】

【００４２】
ビームＢ１ＲとビームＢ２の極座標位置から時間軸上遅れ方向で、それぞれ最も近いブロックを各々検出し、それぞれビームＢ１Ｒ、Ｂ２の記録開始ブロックとする。記録開始ブロックが特定されると、ユーザ情報５４Ａ上におけるビームＢ１Ｒ，Ｂ２の記録開始位置がそれぞれ判明し、これがビームＢ１Ｒ，Ｂ２の割振りポインタＰＢ１,ＰＢ２となる。図２の例では、記録開始ポインタＰＦ０が、実行ビーム数＝３の場合に該当し、ビームＢ０の割振りポインタＰＢ０が記録開始ポインタＰＦ０となっている。
【００４３】
「Phase_Aの場合」
（１）実行ビーム数＝１の場合は、前のフェーズで記録終了したブロックを書き込んだビームで、トラック・ジャンプを行うことなく、そのまま現行のフェーズの情報を連続して記録すればよい。例えば、前のフェーズが３つのビームで情報を記録した場合は、最も外側のビームＢ２で、そのまま今回のフェーズの情報を連続して記録すればよい。従って、割振りポインタは、当該フェーズの記録開始ポインタの位置にビームＢ２の割振りポインタＰＢ２を設定することになる。
【００４４】
（２）実行ビーム数＝２の場合、同様に、レファレンス・ビームＢ１Ｒと、外側のビームＢ２が選択される。これらのビームの記録開始ブロックは、当該フェーズにおける記録開始ブロックの極座標位置（ｒbs，θbs）を基準とし、この基準に対して前記ロック・タイム経過時のレファレンス・ビーム位置を求めて、ビームＢ１Ｒ，Ｂ２の記録開始ブロックを特定する。ロック・タイム経過に至るビームＢ１Ｒ，Ｂ２の極座標位置は、次の（５）式で計算できる。
【数５】

【００４５】
ビームＢ１Ｒの割振りポインタＰＢ１は、当該フェーズの開始ブロックの位置，すなわちフェーズ開始ポインタの位置に設定される。一方、ビームＢ２の割振りポインタＰＢ２は、極座標位置（r2，θ2）から最も近い時間軸上で遅れるブロックに相当する位置に設定される。ビームＢ０は使用しないので、割振りポインタＰＢ０は設定されない。図２の例では、記録開始ポインタＰＦｍ以降が、実行ビーム数＝２の場合に該当し、ビームＢ１Ｒの割振りポインタＰＢ１が記録開始ポインタＰＦｍとなっている。
【００４６】
（３）実行ビーム数＝３の場合は、前記実行ビーム数＝２の場合と同様に、当該フェーズの記録開始ブロックの極座標位置（ｒbs，θbs）を基準とし、この基準に対して前記ロック・タイム経過時のレファレンス・ビーム位置を求めて、ビームＢ０，Ｂ１Ｒ，Ｂ２の記録開始ブロックを特定する。ロック・タイム経過に至るビームＢ０，Ｂ１Ｒ，Ｂ２の極座標位置は、次の（６）式で計算できる。
【数６】

【００４７】
ビームＢ０の割振りポインタＰＢ０は、当該フェーズの開始ブロックの位置，すなわちフェーズ開始ポインタの位置に設定される。一方、ビームＢ１Ｒの割振りポインタＰＢ１は、極座標位置（r1，θ1）から最も近い時間軸上で遅れる最も近いブロックに相当する位置に設定される。ビームＢ２の割振りポインタＰＢ２は、極座標位置（r2，θ2）から時間軸上遅れ方向にある最も近いブロックに相当する位置に設定される。図２の例では、記録開始ポインタＰＦ１，ＰＦ２，……が、実行ビーム数＝３の場合に該当し、ビームＢ０の割振りポインタＰＢ０が記録開始ポインタＰＦ１，ＰＦ２，……となっている。
【００４８】
以上のように、ＣＰＵ５０によるポインタ設定プログラム５８の実行によって、ユーザ情報５４Ａにフェーズ開始ポインタ及びビーム割振りポインタがそれぞれ設定される。図２に示す例では、フェーズＰＦ０，ＰＦ１，ＰＦ２，……はいずれも３つのビームＢ０，Ｂ１Ｒ，Ｂ２で記録が行われるので、割振りポインタＰＢ０，ＰＢ１，ＰＢ２がそれぞれ設定されている。しかし、フェーズＰＦmは２つのビームＢ１Ｒ，Ｂ２で記録が可能であるので、割振りポインタＰＢ１，ＰＢ２のみが設定されている。
【００４９】
次に、以上のようにしてポインタ設定が行われたユーザ情報５４Ａは、フェーズ毎にエンコーダ３８に供給される。図２の例では、最初、ポインタＰＦ０からＰＦ１の前までのユーザ情報がエンコーダ３８に供給され、次に、ポインタＰＦ１からＰＦ２の前までのユーザ情報がエンコーダ３８に供給されるという具合である。
【００５０】
エンコーダ３８では、入力情報の単位毎に光ディスクのフォーマットに準じたスクランブル処理，ＥＣＣの追加，変調などの処理を行い、最終的なエンコード処理が行なわれる。ここで、記録ディスク側における各ビームのアドレスが、クロック・アドレス制御部３６でウォブル信号からそれぞれデコードされており、これらもエンコーダ３８に入力されている。エンコーダ３８では、このビームアドレスに対応してエンコード処理が行われる。処理後のエンコードデータは、各ビーム毎に設定されたビーム割振りポインタＰＢ０，ＰＢ１，ＰＢ２を参照して分離される。すなわち、ビームＢ０にはポインタＰＢ０からＰＢ１が現れる前まで、ビームＢ１ＲにはポインタＰＢ１からＰＢ２が現れる前まで、ビームＢ２にはポインタＰＢ２から当該フェーズの終了までのエンコードデータがそれぞれ割り振られる。
【００５１】
各ビーム毎に分離されたエンコードデータは、パラレルに記録回路４０に入力される。記録回路４０から、入力されたエンコードデータに基づいて各ビーム毎に記録信号が出力されると、レーザドライバ１４によってレーザアレイ１２が駆動され、ユーザ情報に対応してレーザアレイが発光する。これにより、記録用ディスクにユーザ情報５４が記録されることになる。すなわち、ユーザ情報５４は、フェーズ開始ポインタＰＦ０，ＰＦ１，……を参照してフェーズ単位毎にエンコード処理される。そして、ビーム割振りポインタＰＢ０，ＰＢ１，ＰＢ２を参照して各ビーム毎に割り振られ、該当するビームＢ０，Ｂ１Ｒ，Ｂ２によってそれぞれ光ディスクに記録される。
【００５２】
＜エラー発生時の処理＞……ところで、記録時にエラーが発生する場合もある。エラー発生の有無は、メモリ５２に格納されているピット形成監視プログラム６０によって、モニタ１６でピットないしマークの形成状態を監視することで検出される。この監視で、ビットないしマークの形成状態が正常でないと判断されると、その旨がホスト側に通知される。記録対象が色素系ディスク（追記型）の場合は、情報記録を中止して該ディスクを排出する。
【００５３】
これに対し、相変化ディスク（書換可能型）の場合は、リカバリー処理が可能である。まず、エラーが発生した情報ブロックは、ユーザ情報５４Ａに設定した前記各ポインタから知ることができる。そこで、かかるポインタ情報を利用して、リカバリーのためのポインタ再設定を行う。この再設定処理は、ＣＰＵ５０でポインタ設定プログラム５８により行ってもよいし、エンコーダ３８で行ってもよい。このようなポインタ再設定を行うことで、記録動作を継続することができる。なお、同様のリカバリー処理を複数回行ってもエラーが発生する場合は、ホスト側にその旨を通知する。
【００５４】
＜本実施形態の効果＞……以上のように、本実施形態によれば、次のような効果がある。
（１）トラック・ジャンプ後、既に記録された情報に関連なく新たなトラックに情報を記録するビームについては、ロック・タイム経過後に情報記録を開始することとしたので、記録時間が短縮される。
（２）記録すべき情報に、各フェーズと各ビームに対応したポインタを予め設定し、これを参照して情報が記録されるので、最適な動作が可能となり、記録時間が短縮される。
【００５５】
＜他の実施形態＞……本発明には数多くの実施形態があり、以上の開示に基づいて多様に改変することが可能である。例えば、次のようなものも含まれる。
（１）前記実施形態は、ビーム数が「３」の場合を例として説明したが、何らそれに限定されるものではない。また、前記実施形態では、フェーズ開始ポインタとビーム割振りポインタの２種類のポインタを設定したが、フェーズ開始ポインタのみを設定するようにしてもよい。
（２）図１に示した装置構成は一例であり、同様の作用を奏するように各種設計変更が可能である。
（３）前記実施形態では、ブロック単位で情報を記録する場合を示したが、セクタ単位で情報を記録する場合にも同様に適用可能である。
【００５６】
【発明の効果】
以上説明したように、本発明によれば、記録すべき情報にポインタを設定することとしたので、これを参照して複数のビームによる記録を行うことで、記録動作の無駄を省いて記録時間の短縮を図ることができ、高速記録が可能となるという効果がある。
【図面の簡単な説明】
【図１】本発明の一実施形態の主要構成を示すブロック図である。
【図２】前記実施形態におけるメモリの格納内容の一例を示すブロック図である。
【図３】前記実施形態におけるディスク上のビーム配置と座標との関係を示す図である。
【図４】前記実施形態における情報記録の態様を示す図である。
【図５】ビーム選択の方法を示す図である。
【図６】光ディスク上における複数のビームの軌跡例を示す図である。
【符号の説明】
１０…光ヘッド
１２…レーザアレイ
１４…レーザドライバ
１６…モニタ
１８…フォトディテクタ
２０…駆動機構
２２…ＲＦアンプ・イコライザ
２４…ＰＬＬ回路
２６…デコーダ
２８…マトリクスアンプ
３０…帯域フィルタ
３２…サーボ制御回路
３４…ドライバ回路
３６…クロック・アドレス制御部
３８…エンコーダ
４０…記録回路
４２…出力制御回路
５０…ＣＰＵ
５２…メモリ
５４…データ領域
５４Ａ…ユーザ情報
５６…プログラム領域
５８…ポインタ設定プログラム
５８Ａ…フェーズ開始ポインタ設定プログラム
５８Ｂ…ビーム割振りポインタ設定プログラム
５８Ｃ…実行ビーム数演算プログラム
５８Ｄ…ロック・タイム学習予想プログラム
６０…ピット形成監視プログラム
Ｂ０，Ｂ１Ｒ，Ｂ２…ビーム
Ｂ１Ｒ…レファレンスビーム
ＰＦ，ＰＢ…ポインタ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for recording information on an optical disc having a plurality of beams, and more specifically to an improvement in an information recording method for shortening a recording time.
[0002]
[Prior art]
In an optical disc apparatus having a plurality of beams, information is written on an optical disc track while an optical head performs track jumping. FIG. 6 shows this state. In this example, the tracks are formed in a spiral shape, the number of beams is 3, and the number of intermittent tracks is 2. Initially, as shown in FIG. 5A, the beam B0 (circle) on the 0th track on the innermost circumference, the beam B1 (triangle) on the third track, and the beam B2 (square mark on the 6th track). ) Is located. In the figure, the black mark indicates the beam recording start position, and the white mark indicates the current position of the base. When the optical disk rotates in the direction of the arrow FA, the beams B0 to B2 move on the track from the black mark recording start position to the white mark position, and record information on each track. When the optical disk rotates in the direction of the arrow FA slightly less than 3 turns, the state shown in FIG. That is, the beam B0 approaches the recording start point of the beam B1, and the beam B1 approaches the recording start point of the beam B2.
[0003]
Then, when the optical disk rotates exactly three times, the beam B0 reaches the recording start point of the beam B1, and the beam B1 reaches the recording start point of the beam B2. Then, this time, the track jump of the optical head is performed, and the beam B0 starts recording from the recording end point of the beam B2. At this time, each beam cannot be recorded immediately after the track jump, and it is necessary to perform PLL locking and address decoding. That is, a required preparation time is required from the start of the track jump to the start of information recording. Considering this preparation time, the position of the track jump is determined.
[0004]
[Problems to be solved by the invention]
By the way, in the above-described prior art, the following points are not sufficiently studied, and thus there is a disadvantage that a theoretically conceivable information recording speed cannot be obtained.
(1) Even if the recording after the track jump is performed, the beam B0 is as described above, but may the other beams B1 and B2 start recording simultaneously with the beam B0?
(2) When the amount of information to be recorded is small, it may not be necessary to use all the beams. In that case, how to estimate the optimal number of execution beams and allocate information beams Do you?
(3) An error may occur during recording of information. How do you recover in such cases?
[0005]
By devising the recording method in consideration of the above points, it is considered that the recording speed of information can be improved without waste.
[0006]
The present invention focuses on the above points, and provides an optical disc information recording method and apparatus capable of shortening the recording time by eliminating waste of information recording operation in an optical disc apparatus having a plurality of beams. That is the purpose.
[0007]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides an information recording method for an optical disc in which information is recorded on an optical disc by a plurality of beams, the amount of information to be recorded stored in a memory, and the plurality of beams performing track jumping. By referring to the amount of information that can be recorded on the optical disc without performing the calculation, the number of execution beams for recording information is calculated, and from the start of the track jump to the optical disc, after the track jump is finished, the first step With the calculated number of execution beams, the time required for recording preparation until an address where information can be recorded on the optical disk is detected is learned and predicted as a lock time.numberBased on the rotation speed of the optical disk and the expected lock time, if the amount of information that can be written to the optical disk in parallel without multiple tracks performing a track jump is set as the phase, the start of the phase on the memory Set the phase start pointer to specify the address and calculate the execution beamnumberWhen the amount of information determined in the phase is allocated to each beam based on the rotation speed of the optical disc and the expected lock time and recorded on the optical disc, the start address of the phase determined for each beam on the memory is set. A designated beam allocation pointer is set.
[0008]
  One of the main formsEach placeIt is characterized in that the processing is performed separately in a phase in which information is first recorded and a phase in which the information is recorded. One of the other forms is characterized in that the track jump of the light beam is performed in consideration of the preparation time from the track jump to the address detection on the disk..
[0009]
According to the present invention, the pointer indicating the recording start position for each phase and each beam is set in the information to be recorded. By performing recording with a plurality of beams with reference to these pointers, it is possible to reduce the recording time by eliminating the waste of the recording operation, and high-speed recording is possible.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail. In the following description, it is assumed that an optical disk having a CLV (constant linear velocity) system is written in units of blocks. FIG. 1 shows the main configuration of a three-beam recording apparatus according to this embodiment. In the figure, an optical head 10 includes a laser array 12 that outputs a recording laser beam of three channels. The laser array 12 is driven by a three-channel laser driver 14, and its laser output is detected by a three-channel monitor (front photo detector) 16.
[0011]
The laser beam reflected by the optical disk is incident on a three-channel photodetector 18 where photoelectric conversion is performed for each channel. Further, the optical head 10 is provided with a drive mechanism 20 for driving rotation, focus, tracking, and seek (or track jump). The drive mechanism 20 includes a spindle motor, a biaxial motor, and a thread motor.
[0012]
The above-described RF signal output side of the photodetector 18 is connected to a decoder 26 through an RF amplifier / equalizer 22 and a PLL circuit 24 for binary encoding in this order. The decoder 26 is configured to perform EFM + (8-16 conversion) decoding, ECC (error check correction), and SP conversion (serial / parallel conversion). The decode data and error output side of the decoder 26 is connected to the CPU 50. On the other hand, the control signal output side of the photodetector 18 is supplied to the matrix amplifier 28. The matrix amplifier 28 is a circuit that generates a light amount signal for detecting a wobble signal, a focus error signal, and tracking error signals (DPP and DPD) from an input signal, and the light amount signal is supplied to a band filter 30 having an AGC function. The focus error signal and tracking error signal are supplied to the servo control circuit 32. The servo control signal output side of the servo control circuit 32 is connected to the drive mechanism 20 of the optical head 10 via the driver circuit 34.
[0013]
The output side of the above-described band filter 30 is connected to the clock / address control unit 36. The clock / address control unit 36 has a function of detecting a wobble signal from an input signal for each beam and generating an address signal and a write clock for each beam. These signals are supplied to the encoder 38. The encoder 38 performs EFM + (8-16 conversion) encoding, ECC (error check / collect), PS conversion (for the data (user information) supplied from the host side (not shown) via the CPU 50). (Parallel / serial conversion).
[0014]
The encoded NRZ data output from the encoder 38 is supplied to a recording circuit (write strategy generator) 40 together with a clock signal. The data output side of the recording circuit 40 is connected to the laser driver 14 so that the laser array 12 is driven corresponding to the data to be recorded. The output of the laser array 12 is monitored by the monitor 16 and is controlled by the output control circuit 42 to have a predetermined value based on the timing signal supplied from the recording circuit 40.
[0015]
User information to be recorded on the optical disk is supplied to the CPU 50 from an external host side (not shown), and is stored in the memory 52 by the CPU 50. The CPU 50 refers to the signals of the above-described units as necessary, executes a program stored in the memory 52, records user information stored in the memory 52 on the optical disc, and information reproduced from the optical disc. It has a function to output.
[0016]
FIG. 2 shows data and programs stored in the memory 52. In the data area 54, user information 54A, which is data to be recorded on the optical disc, is stored. The user information 54A is sent from the host computer to the CPU 50 by an appropriate command such as SCSI, ATAPI, USB, IEEE1394. The CPU 50 buffers the sent data in the memory 52 as user information 54A.
[0017]
The program area 56 stores a pointer setting program 58 for setting a pointer indicating the recording start point of each phase and each beam in the user information 54A. The pointer setting program 58 includes
(1) a phase start pointer setting program 58A for setting a phase start pointer indicating a recording start point in each phase;
(2) a beam allocation pointer setting program 58B for setting a beam allocation pointer indicating a recording start point of each beam in each phase;
(3) an execution beam number calculation program 58C for calculating the number of beams for actually recording information (the number of execution beams) out of the number of beams included in the recording apparatus;
(4) Track jump, pull-in in the PLL circuit 24, time required for decoding an address based on the wobble signal in the clock address control unit 36, that is, time required for recording preparation (hereinafter referred to as "lock time") Rock time learning prediction program 58D for learning and predicting
Is included.
[0018]
The program area 56 also includes a pit formation monitoring program 60 that detects the occurrence of an error by monitoring the pit or mark formation state on the monitor 16.
[0019]
FIG. 3 shows the beam arrangement on the optical disc in the present embodiment. As shown in the figure, in the present embodiment, the set number of beams (the number of beams physically held by the apparatus) is “3”. Further, the number of intermittent tracks indicating how many tracks each beam straddles is “2”. The position of each beam is displayed in polar coordinates (r, θ), where the innermost beam is B0, the middle beam is B1R, and the outermost beam is B2. Any one of them is defined as a reference beam. In this example, the center B1R among the beams B0, B1R, and B2 is defined as the reference beam. Of the three beams, the reference beam is the reference beam for track jumping and the first tracking servo is applied.
[0020]
Next, a method for recording user information on the optical disc by the beam arrangement as described above will be described with reference to FIG. In the figure, the vertical axis represents the track number where each beam B0, B1R, B2 is located, and the horizontal axis represents the recording locus by each beam when the number of rotations of the optical disk is taken. As shown in the figure, when information is recorded for the first time, recording is started simultaneously for three beams. In the example shown in the figure, the beam B0 is in the track M, the beam B1R is in M + 3, and the beam B2 is in M + 6, and recording of information starts simultaneously. Then, when the optical disk rotates three times (when the horizontal axis changes from N to N + 3), the phase 0 recording operation ends.
[0021]
As described above, the next recording operation must be performed so that the beam B0 continues from the recording end point W1 of the beam B2. However, in order to start the recording operation by the beam B0, track jump, pull-in in the PLL circuit 24, and address decoding based on the wobble signal in the clock address controller 36 must be performed. Therefore, in consideration of the lock time which is the time required for these recording preparations, the track jump of the optical head 10 is performed as indicated by the arrow F1. That is, a jump is made to a position corresponding to the lock time before the position W2 continuous to the recording end point W1.
[0022]
  Thereafter, the recording preparation is performed along with the rotation of the optical disc, the preparation is completed and recording is possible, and information recording starts when the beam B0 reaches a position W2 continuous with the recording end point W1 of the beam B2. Is done. The lock time is a program for predicting the lock time in the memory 52.58DBecause of this, learning and prediction are always performed.
[0023]
On the other hand, the beams B1R and B2 are similarly track-jumped and the recording preparation described above is performed. However, unlike the beam B0, the beams B1R and B2 do not need to be recorded continuously at the recording end point in the phase 0. Therefore, in the present embodiment, for the beams B1R and B2, the information recording operation is started at the time points W3 and W4 when the recording preparation operation is completed. For this reason, the information recording starts earlier with the beams B1R and B2 than with the beam B0. The beam B0 ends recording at a time point W5 that is continuous with the recording start point W3 of the beam B1R, and the beam B1R ends recording at a time point W6 that is continuous with the recording start point W4 of the beam B2. Recording with the beam B2 is completed simultaneously with the later of the beams B0 and B1R. The above is the operation of phase 1. From phase 2 onward, this phase 1 operation is repeated.
[0024]
Next, in the present embodiment, information is recorded on the optical disc by performing the track jump operation in the above-described procedure, and pointers indicating the delimiters of information recorded in each phase are the phase start pointer setting program 58A, It is set by the beam allocation pointer setting program 58B. In the example of FIG. 4, information is recorded using all of the beams B0, B1R, and B2. However, depending on the amount of information to be recorded, it may not be necessary to use all of the beams. . Therefore, the number of beams actually performing the recording operation is calculated by the execution beam number calculation program 58C.
[0025]
Hereinafter, a method for setting these pointers and how to obtain the number of execution beams will be described. In this example, two types of pointers are set in the user information 54A buffered from the host side through the CPU 50 in the memory 52. One is a pointer for setting the start address of a block area that can be recorded at one time without performing a track jump (ie, “phase start pointer”), and another type of pointer. Is a pointer (hereinafter referred to as a “beam allocation pointer”) that is set to allocate information that can be recorded in one phase to each beam. This beam allocation pointer is set for each execution beam number.
[0026]
Information necessary for the above-described pointer setting includes the arrangement of the three beams B0, B1R, and B2, the positions of these beams, the rotational speed of the disk, and the lock time (the time required for track jump + the lock required for PLL). Time + address decoding time based on the wobble signal). The lock time is measured at the time of recording information, and the optimum time is estimated by learning the relationship between the rotation speed of the optical disk and this time by a lock time learning / prediction program.
[0027]
For example, set beam number is “Beam_number”, intermittent track number is “intermittent_number”, linear velocity at recording is “v (m / s)”, lock time is “Lock_time (ms)”, execution beam number is “EffectiveBeam_number” " In an actual optical disk apparatus, the beam side is fixed and the disk side rotates. For convenience, the disk side is fixed and the beam side rotates while the track on the disk side is traced. The arrangement of the beams B0, B1R, B2 is as shown in FIG. Further, the beam interval is “d (mm)”, the interval between the beam B0 and the beam B1R is “d01”, and the interval between the beams B1R and B2 is “d12”.
[0028]
<Phase start pointer setting procedure> In this case, the CPU 50 first calculates the number of execution beams by the execution beam number calculation program 58C. This calculation of the number of effective beams has different calculation formulas in the first phase (phase 0 in FIG. 4) and the subsequent phases (phases 1, 2,... In FIG. 4). Hereinafter, the first phase is represented by “Phase_int”, and the subsequent phases are represented by “Phase_A”.
[0029]
“Phase_int”: The length of a track on which information can be recorded in this phase is expressed by the following equation (1). The total track length indicated by the solid lines L00, L01, and L02 in FIG. 4 corresponds to the equation (1).
[Expression 1]

[0030]
In this equation (1), “r_start” represents the radius (recording start radius) of the recording start block of the first phase “Phase_int” on the disk, “pi” represents the circumference, and “Track_Pitch” records. Indicates the track pitch according to the disc format. “R_base” represents the radius position of the start block of the user information 54A according to the disc format, and “θ” represents “r_start” where the radian advances from the angle reference of the polar coordinate conversion of the start block of the user information 54A. Is present.
[0031]
While substituting various conditions into the above equation (1), the maximum value of the effective beam number “EffectiveBeam_number” with respect to the set beam number is set so that (residual recording length−recordable length) ≧ 0 is satisfied. Ask. The remaining recording length is obtained by subtracting the amount already recorded from the track length corresponding to the user information 54A. The inequality means that the length of a track that can be recorded in one phase is smaller than the remaining recording length. In such a case, it is more efficient to perform information recording using as many beams as possible.
[0032]
Note that when the recordable track length is divided by the unit block length and a remainder is generated, the track length is increased or decreased. Since information is recorded in units of blocks, such processing is performed. In this case, when the number of remaining blocks is smaller than the number of blocks raised or lowered, this number of remaining blocks is used. For example, a case where information is already recorded on the optical disk and the remaining recordable capacity is small is applicable.
[0033]
As described above, the recording end block number is determined from the recording start block number in the first phase “Phase_int”. The start pointer PF0 of the first phase is the start point of the user information 54A as shown in FIG. 2, but the number of blocks in the first phase, that is, the amount of information recorded in the first phase is determined. As a result, the start pointer PF1 of the next phase is determined.
[0034]
“Phase_A”: The length of the track on which information can be recorded in this phase is expressed by the following equation (2). The total track length indicated by solid lines L10, L11, and L12 in FIG. 4 corresponds to the equation (2).
[Expression 2]

[0035]
While substituting various conditions into the equation (2), the maximum value of the number of effective beams is obtained within a set beam that satisfies (residual recording length−recordable length) ≧ 0. In this case as well, as in the case of the first phase, the recordable length is divided by one block length, and when there is a remainder, carry-up or carry-down is performed. If the number of remaining blocks is smaller than the number of blocks raised or lowered, this number of remaining blocks is used. By such an operation, the recording end block number of the current phase is determined from the recording start block number of the subsequent phase. As a result, the number of blocks to be recorded is determined by the current phase, and as a result, the recording start pointer PF2 for the next phase is determined. By repeating this operation, it is possible to sequentially determine the recording start pointer for the next phase to be continued.
[0036]
<Setting of Beam Allocation Pointer> A description will be given of a procedure for setting a beam allocation pointer that indicates which information is recorded by which beam in one phase. As methods for selecting the number of effective beams, two methods are conceivable as shown in FIGS. 5 (A) and 5 (B), respectively. First, when the reference beam N is used as a reference and the method shown in FIG. 6A has two beams with the same radius (when there are a plurality of selectable beams), the beam outside the disk is given priority. It is a method to select. For example, when the number of execution beams is “2”, the beam N + 1 outside the reference beam N is selected. On the other hand, the method shown in FIG. 5B is a method of preferentially selecting the beam inside the disk. For example, when the number of effective beams is “2”, the beam N−1 inside the reference beam N is selected. However, when the number of set beams is “3” and the number of intermittent tracks is “0”, only the method shown in FIG. This is because the information writing connection is not successful unless the method (B) is used. In the following description, the method shown in FIG.
[0037]
Of the beam allocation pointers set for allocating the area recordable in each phase of the user information 54A for each beam, the pointer indicating the recording start position of the beam B0 is PB0, and the pointer indicating the recording start position of the reference beam B1R is PB1. , The pointer indicating the recording start position of the beam B2 is PB2. Then, the end point of the lock time after the track jump is used as a reference. However, in the case of the first phase, the time point when the innermost beam of the plurality of execution beams coincides with the recording start position is used as a reference.
[0038]
"For Phase_int"
(1) When the number of execution beams = 1, all information of the phase is written by the reference beam B1R. In this case, only PB1 is set as the allocation pointer, and PB0 and PB2 are not set. The allocation pointer PB1 matches the position of the recording start pointer of the phase.
[0039]
(2) When the number of execution beams = 2, since the outer beam is selected as shown in FIG. 5A, the reference beam B1R and the outer beam B2 are selected. Among these, the allocation pointer PB1 of the reference beam B1R coincides with the position of the recording start pointer of the phase. The block where the outer beam B2 starts recording is obtained from the following equation (3). It is convenient to prepare the calculation result of the equation (3) as a table in advance so that the polar coordinate value can be understood instantaneously.
[Equation 3]

[0040]
From this value, the closest block in the delay direction on the time axis is set as a block for starting recording with the beam B2. When the recording start block is specified, the recording start position of the beam B2 on the user information 54A is determined, and this becomes the allocation pointer PB2 of the beam B2. Since the beam B0 is not used, the allocation pointer PB0 is not set.
[0041]
(3) When the number of executed beams = 3, the polar coordinate positions of the beams B1R and B2 when the beam B0 matches the recording start block of the phase can be obtained from the following equation (4). . In this case as well, it is convenient to prepare the calculation results in advance as a table and read them from now on.
[Expression 4]

[0042]
The blocks closest to each other in the delay direction on the time axis from the polar coordinate positions of the beam B1R and the beam B2 are detected, respectively, and set as the recording start blocks of the beams B1R and B2, respectively. When the recording start block is specified, the recording start positions of the beams B1R and B2 on the user information 54A are determined, and these become the allocation pointers PB1 and PB2 of the beams B1R and B2. In the example of FIG. 2, the recording start pointer PF0 corresponds to the case where the number of execution beams = 3, and the allocation pointer PB0 of the beam B0 is the recording start pointer PF0.
[0043]
"Phase_A"
(1) When the number of execution beams = 1, the information of the current phase may be continuously recorded as it is without performing a track jump with the beam in which the block that has been recorded in the previous phase is written. For example, when information is recorded with three beams in the previous phase, information on the current phase may be continuously recorded as it is with the outermost beam B2. Therefore, the allocation pointer sets the allocation pointer PB2 of the beam B2 at the position of the recording start pointer of the phase.
[0044]
(2) When the number of execution beams = 2, the reference beam B1R and the outer beam B2 are selected in the same manner. The recording start blocks of these beams are based on the polar coordinate positions (rbs, θbs) of the recording start block in the phase, and the reference beam position when the lock time has elapsed is obtained with respect to this reference, and the beams B1R, The recording start block of B2 is specified. The polar coordinate positions of the beams B1R and B2 that reach the lock time can be calculated by the following equation (5).
[Equation 5]

[0045]
The allocation pointer PB1 of the beam B1R is set to the position of the start block of the phase, that is, the position of the phase start pointer. On the other hand, the allocation pointer PB2 of the beam B2 is set to a position corresponding to a block delayed on the time axis closest to the polar coordinate position (r2, θ2). Since the beam B0 is not used, the allocation pointer PB0 is not set. In the example of FIG. 2, the recording start pointer PFm and the subsequent ones correspond to the case where the number of execution beams = 2, and the allocation pointer PB1 of the beam B1R is the recording start pointer PFm.
[0046]
(3) When the number of executed beams = 3, as in the case of the number of executed beams = 2, the polar coordinate position (rbs, θbs) of the recording start block of the relevant phase is used as a reference, and the lock The reference beam position when the time elapses is obtained, and the recording start block of the beams B0, B1R, and B2 is specified. Polar coordinate positions of the beams B0, B1R, and B2 that reach the lock time can be calculated by the following equation (6).
[Formula 6]

[0047]
The allocation pointer PB0 of the beam B0 is set to the position of the start block of the phase, that is, the position of the phase start pointer. On the other hand, the allocation pointer PB1 of the beam B1R is set to a position corresponding to the closest block that is delayed on the closest time axis from the polar coordinate position (r1, θ1). The allocation pointer PB2 of the beam B2 is set to a position corresponding to the closest block in the delay direction on the time axis from the polar coordinate position (r2, θ2). In the example of FIG. 2, the recording start pointers PF1, PF2,... Correspond to the case where the number of execution beams = 3, and the allocation pointer PB0 of the beam B0 is the recording start pointers PF1, PF2,.
[0048]
As described above, by the execution of the pointer setting program 58 by the CPU 50, the phase start pointer and the beam allocation pointer are respectively set in the user information 54A. In the example shown in FIG. 2, since all of the phases PF0, PF1, PF2,... Are recorded with three beams B0, B1R, B2, allocation pointers PB0, PB1, PB2 are set. However, since the phase PFm can be recorded by the two beams B1R and B2, only the allocation pointers PB1 and PB2 are set.
[0049]
Next, the user information 54A for which the pointer setting has been performed as described above is supplied to the encoder 38 for each phase. In the example of FIG. 2, first, user information from the pointers PF0 to PF1 is supplied to the encoder 38, and then user information from the pointers PF1 to PF2 is supplied to the encoder 38.
[0050]
The encoder 38 performs scramble processing according to the format of the optical disc, addition of ECC, modulation, etc. for each unit of input information, and final encoding processing is performed. Here, the address of each beam on the recording disk side is decoded from the wobble signal by the clock address control unit 36, and these are also input to the encoder 38. The encoder 38 performs an encoding process corresponding to the beam address. The encoded data after processing is separated with reference to beam allocation pointers PB0, PB1, and PB2 set for each beam. That is, the encoded data from the pointer PB2 to the end of the phase is assigned to the beam B2 until the pointer BB1 appears before the pointer PB1 appears before the beam B0, until the pointer BB1 appears before the pointer PB1 appears.
[0051]
The encoded data separated for each beam is input to the recording circuit 40 in parallel. When a recording signal is output for each beam based on the input encoded data from the recording circuit 40, the laser array 12 is driven by the laser driver 14, and the laser array emits light corresponding to the user information. As a result, the user information 54 is recorded on the recording disk. That is, the user information 54 is encoded for each phase with reference to the phase start pointers PF0, PF1,. Then, the beam allocation pointers PB0, PB1, and PB2 are referred to and allocated to each beam, and recorded on the optical disc by the corresponding beams B0, B1R, and B2, respectively.
[0052]
<Processing when an error occurs> ...... By the way, an error may occur during recording. Whether or not an error has occurred is detected by monitoring the pit or mark formation state on the monitor 16 by the pit formation monitoring program 60 stored in the memory 52. If it is determined by this monitoring that the bit or mark formation state is not normal, the host side is notified of this. When the recording target is a dye-based disc (recordable type), information recording is stopped and the disc is ejected.
[0053]
In contrast, in the case of a phase change disk (rewritable type), recovery processing is possible. First, an information block in which an error has occurred can be known from each pointer set in the user information 54A. Therefore, pointer resetting for recovery is performed using such pointer information. This resetting process may be performed by the CPU 50 by the pointer setting program 58 or by the encoder 38. By performing such pointer resetting, the recording operation can be continued. If an error occurs even if the same recovery process is performed a plurality of times, the host side is notified accordingly.
[0054]
  <Effects of the present embodiment> As described above, according to the present embodiment, the following effects are obtained.
(1) For a beam for recording information on a new track after the track jump, the information recording is started after the lapse of the lock time, so that the recording time is shortened.
(2) Since information corresponding to each phase and each beam is set in advance in information to be recorded and information is recorded with reference to this, optimal operation is possible and recording time is shortened..
[0055]
<Other Embodiments> ...... There are many embodiments of the present invention, and various modifications can be made based on the above disclosure. For example, the following are included.
(1) In the above embodiment, the case where the number of beams is “3” has been described as an example. However, the present invention is not limited to this. In the embodiment, two types of pointers, ie, a phase start pointer and a beam allocation pointer are set. However, only the phase start pointer may be set.
(2) The apparatus configuration shown in FIG. 1 is an example, and various design changes can be made so as to achieve the same operation.
(3) In the above-described embodiment, the case where information is recorded in units of blocks has been described.
[0056]
【The invention's effect】
As described above, according to the present invention, since the pointer is set to the information to be recorded, recording with a plurality of beams is performed with reference to this, so that the recording operation is not wasted. This is advantageous in that it can be shortened and high-speed recording becomes possible.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a main configuration of an embodiment of the present invention.
FIG. 2 is a block diagram showing an example of stored contents of a memory in the embodiment.
FIG. 3 is a diagram showing a relationship between a beam arrangement on a disk and coordinates in the embodiment.
FIG. 4 is a diagram showing an aspect of information recording in the embodiment.
FIG. 5 is a diagram illustrating a beam selection method.
FIG. 6 is a diagram illustrating an example of trajectories of a plurality of beams on an optical disc.
[Explanation of symbols]
10 ... Optical head
12 ... Laser array
14 ... Laser driver
16 ... Monitor
18 ... Photo detector
20 ... Drive mechanism
22 ... RF amplifier equalizer
24 ... PLL circuit
26 ... Decoder
28 ... Matrix amplifier
30 ... Band filter
32 ... Servo control circuit
34 ... Driver circuit
36: Clock address control unit
38 ... Encoder
40 ... Recording circuit
42. Output control circuit
50 ... CPU
52 ... Memory
54: Data area
54A ... User information
56 ... Program area
58. Pointer setting program
58A ... Phase start pointer setting program
58B ... Beam allocation pointer setting program
58C ... Execution beam number calculation program
58D ... Rock time learning prediction program
60 ... Pit formation monitoring program
B0, B1R, B2 ... Beam
B1R ... Reference beam
PF, PB ... pointer

Claims (6)

An information recording method of an optical disc for recording information on an optical disc by a plurality of beams,
A first number for calculating the number of execution beams for recording information is referred to by referring to the amount of information to be recorded stored in the memory and the amount of information that the plurality of beams can record on the optical disc without performing track jump. Step,
An address at which the information can be recorded on the optical disc with the number of execution beams calculated in the first step after starting the track jump to the optical disc and ending the track jump. The second step of learning the time required to prepare for recording until the detection of the
Based on the number of execution beams calculated in the first step, the rotation speed of the optical disc, and the lock time predicted in the second step, the plurality of beams do not perform track jumping. A third step of setting a phase start pointer for designating the start address of the phase on the memory when the amount of information that can be written in parallel is set as a phase;
Based on the number of execution beams calculated in the first step, the rotation speed of the optical disc, and the lock time predicted in the second step, the amount of information determined in the phase is determined for each beam. A fourth step of setting a beam allocation pointer for designating a start address of the phase determined for each beam on the memory when allocating and recording on the optical disc;
An information recording method for an optical disc, comprising:   2. The method of recording information on an optical disk according to claim 1, wherein the processing of each step is performed separately in a phase in which information is first recorded and a phase in which the information is subsequently recorded.   3. The optical disk information recording method according to claim 1, further comprising a step of performing track jump of the light beam in consideration of a preparation time from track jump to address detection on the disk. An information recording apparatus for an optical disc that records information on an optical disc by a plurality of beams,
A memory for storing the information to be recorded;
An execution beam for calculating the number of execution beams for recording information with reference to the information amount of information stored in the memory and the information amount that the plurality of beams can record on the optical disc without performing track jump Number arithmetic means,
An address at which the information can be recorded on the optical disk with the number of execution beam numbers calculated by the execution beam number calculation means after the start of the track jump to the optical disk and after the completion of the track jump. Learning the time required to prepare for recording until the detection of the lock time, and predicting the lock time as a lock time,
Performing an execution number of beams computed by the execution beam number calculation means, and the rotational speed of the optical disc, based on the expected lock time by said lock time learning expected means, said plurality of beams to a track jump Phase start pointer setting means for setting a phase start pointer for designating the start address of the phase on the memory, when the amount of information that can be written in parallel on the optical disk is a phase,
The execution number of beams computed by the execution beam number calculation means, and the rotational speed of the optical disc, based on the expected lock time by said lock time learning expected unit, the amount of information determined by the phase A beam allocation pointer setting means for setting a beam allocation pointer for designating a start address of the phase determined for each beam on the memory when the beam is allocated to each beam and recorded on the optical disc;
An optical disk information recording apparatus comprising:   5. The optical disk information recording apparatus according to claim 4, wherein the processing of each means is performed separately in a phase in which information is first recorded and a phase in which the information is recorded.   6. The optical disk information recording apparatus according to claim 4, wherein said optical beam track jump is performed in consideration of a preparation time from track jump to address detection on the disk.

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