JP2004054971A - Information recording method for optical disk and information recording device for the optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain reduction of recording time by eliminating the useless recording operation of the information in an optical disk device having a plurality of beams. <P>SOLUTION: The user information 54A, in which pointers are set by the execution of a pointer set program 58 according to a CPU 50, is separated by the pointers PF set for every phase and supplied to an encoder 38. In the encoder 38, the encode process based on the format of the optical disk is carried out for every block unit of the input information. Data after the process are separated by referring to the beam allocation pointers PB0, PB1, PB2 which are set for every beam. Encode data for every beam are inputted to a recording circuit 40 in parallel. When the recording signal is outputted for every beam in accordance with the inputted encode data, a laser array is emitted and the user information 54A is recorded on the disk. <P>COPYRIGHT: (C)2004,JPO

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。
（３）また、情報の記録最中にエラーが発生しても、前記ポインタを参照することで、迅速なリカバリー処理が可能となる。
【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]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for recording information on an optical disk having a plurality of beams, and more particularly, to an improvement in an information recording method for shortening a recording time.
[0002]
[Prior art]
2. Description of the Related Art In an optical disk device having a plurality of beams, a method is used in which an optical head writes information on tracks of an optical disk while jumping tracks. FIG. 6 shows this state. In this example, the tracks are spirally formed, and the number of beams is three and the number of intermittent tracks is two. First, as shown in FIG. 7A, a beam B0 (circle mark) is assigned to the 0th track on the innermost circumference, a beam B1 (triangle mark) is assigned to the third track, and a beam B2 (square mark) is assigned to the sixth track. ) Is located. In the figure, black marks indicate the beam recording start position, and white marks indicate 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 tracks from the recording start position of the black mark to the position of the white mark, and record information on each track. When the optical disk rotates slightly less than three turns in the direction of arrow FA, 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 recording of the beam B0 starts 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 lock and address decoding. That is, a required preparation time is required from the start of the track jump to the start of the recording of information. The position of the track jump is determined in consideration of the preparation time.
[0004]
[Problems to be solved by the invention]
By the way, in the above-mentioned prior art, since the following points are not sufficiently studied, there is an inconvenience that a theoretically conceivable recording speed of information 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 capacity of information to be recorded is small, it may not be necessary to use all the beams. In such a case, how to estimate the optimal number of effective beams and allocate the information beam Do you do?
(3) An error may occur during recording of information. How do you recover in such a case?
[0005]
By devising a recording method in consideration of the above points, it is considered that the information recording speed can be improved without waste.
[0006]
The present invention, which focuses on the above points, provides an optical disk information recording method and an optical disk information recording method capable of shortening the recording time by eliminating wasteful information recording operation in an optical disk device having a plurality of beams. That is its purpose.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a method for recording information on an optical disk by using a plurality of beams, the amount of information to be recorded and the amount of information that the plurality of beams can record on the optical disk without performing a track jump. Referring to the number of execution beams for executing the recording of information, and then, based on the calculated number of execution beams, for each phase in which the plurality of beams record information on the optical disk without performing a track jump. Setting a phase start pointer indicating a recording start position, and further setting a beam allocation pointer indicating a position at which the plurality of beams start recording in the phase based on the calculated number of executed beams. Features.
[0008]
One of the main modes is characterized in that the processing of each step is performed separately in a phase in which information is recorded first and a phase in which the information is continued thereafter. Another embodiment is characterized in that the track jump of the light beam is performed in consideration of a preparation time from a track jump to address detection on a disk. Still another embodiment is characterized in that when an error occurs during recording of information, resetting is performed using the pointer.
[0009]
According to the present invention, a pointer indicating a recording start position for each phase and for each beam is set in the information to be recorded. By performing recording using a plurality of beams with reference to these pointers, it is possible to reduce the recording time without wasting the recording operation, and it is possible to perform high-speed recording.
[0010]
BEST MODE FOR CARRYING OUT 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 sector arrangement of a CLV (constant linear velocity) method is written in block units. FIG. 1 shows a main configuration of a three-beam recording apparatus according to the present embodiment. In FIG. 1, the optical head 10 includes a laser array 12 that outputs three-channel recording laser beams. 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 enters 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 two-axis motor, and a thread motor.
[0012]
The RF signal output side of the above-described photodetector 18 is connected to a decoder 26 via an RF amplifier / equalizer 22 and a PLL circuit 24 for binary encoding in that order. The decoder 26 is configured to perform EFM + (8-16 conversion) decoding, ECC (error check correct), and SP conversion (serial / parallel conversion). The output side of the decoded data and the error of the decoder 26 is connected to the CPU 50. On the other hand, a signal output side for control of the photodetector 18 is supplied to a 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 a tracking error signal (DPP and DPD) from an input signal. The light amount signal is supplied to a bandpass filter 30 having an AGC function. The focus error signal and the 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 bandpass 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 / correct), and PS conversion (data) on data (user information) supplied from the host side (not shown) via the CPU 50. It has a function to perform 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, whereby the laser array 12 is driven according to the data to be recorded. The output of the laser array 12 is monitored by the monitor 16, and is controlled to have a predetermined value by an output control circuit 42 based on a 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 (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 the user information stored in the memory 52 on the optical disc, and reads information reproduced from the optical disc. Output function.
[0016]
FIG. 2 shows data and programs stored in the memory 52. The data area 54 stores user information 54A which is data to be recorded on the optical disc. The user information 54A is sent from the host computer to the CPU 50 by an appropriate command such as SCSI, ATAPI, USB, or 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 the recording start point of each beam in each phase.
(3) An execution beam number calculation program 58C for calculating the number of beams (execution beam number) for actually recording information among the number of beams included in the recording device,
(4) Time required for performing a track jump, pulling in the PLL circuit 24, and decoding an address based on a wobble signal in the clock address control unit 36, that is, time required for recording preparation (hereinafter, "lock time") Lock time learning prediction program 58D for learning and predicting
Are included.
[0018]
The program area 56 also includes a pit formation monitoring program 60 that monitors the state of formation of pits or marks on the monitor 16 to detect whether an error has occurred.
[0019]
FIG. 3 shows a beam arrangement on an 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 as an apparatus) is “3”. The number of intermittent tracks indicating how many tracks each beam straddles is “2”. The position of each beam is represented by polar coordinates (r, θ), and the innermost beam is B0, the middle beam is B1R, and the outermost beam is B2. Then, any one of them is defined as a reference beam. In this example, the center B1R of the beams B0, B1R, and B2 is defined as a reference beam. Of the three beams, a beam that serves as a reference for track jump and is subjected to tracking servo first is a reference beam.
[0020]
Next, a method of recording user information on an optical disk by the above-described beam arrangement will be described with reference to FIG. In the figure, the vertical axis shows the track number where each of the beams B0, B1R, and B2 is located, and the horizontal axis shows the recording trajectory of each beam when the number of rotations of the optical disk is taken. As shown in the figure, when recording information for the first time, recording is started simultaneously for three beams. In the example shown in the figure, the beam B0 is on the track M, the beam B1R is on M + 3, and the beam B2 is on M + 6. Then, when the optical disk has rotated three times (when the horizontal axis has changed from N to N + 3), the recording operation of phase 0 is completed.
[0021]
The next recording operation must be performed so that the beam B0 continues from the recording end point W1 of the beam B2, as described above. However, in order to start the recording operation using the beam B0, it is necessary to perform a track jump, pull-in in the PLL circuit 24, and decoding of an address based on the wobble signal in the clock / address control unit 36. Therefore, the track jump of the optical head 10 is performed as shown by an arrow F1 in consideration of the lock time which is the time required for the recording preparation. That is, the position jumps to a position equivalent to the lock time before the position W2 that is continuous with the recording end point W1.
[0022]
Thereafter, the recording preparation is performed along with the rotation of the optical disk, and the recording is completed and the recording is enabled. At the time when the beam B0 becomes a position W2 continuous with the recording end point W1 of the beam B2, the recording of the information is started. Is done. The lock time is always learned and predicted by the lock time learning prediction program 60 in the memory 52.
[0023]
On the other hand, the beams B1R and B2 also make a track jump, and perform the recording preparation described above. However, unlike the beam B0, the beams B1R and B2 do not need to record continuously at the recording end point in the phase 0. Therefore, in the present embodiment, the recording operation of the beams B1R and B2 is started at the time points W3 and W4 when the recording preparation operation is completed. Therefore, the recording of information is started earlier with the beams B1R and B2 than with the beam B0. Then, the beam B0 ends the recording at the time W5 that is continuous with the recording start point W3 of the beam B1R, and the beam B1R ends the recording at the time W6 that is continuous with the recording start point W4 of the beam B2. The recording by the beam B2 ends at the same time as the later of the beams B0 and B1R. The above is the operation of the phase 1. After the phase 2, the operation of the phase 1 is repeated.
[0024]
Next, in the present embodiment, the information is recorded on the optical disc by performing the track jump operation in the above-described procedure, and the pointer indicating the break of the information recorded in each phase is stored in the phase start pointer setting program 58A, This 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 the beams. . Therefore, the number of beams for actually performing the recording operation is calculated by the executed beam number calculation program 58C.
[0025]
Hereinafter, a method for setting these pointers and a method for obtaining the number of execution beams will be described. In this example, two types of pointers are set in the memory 52 for the user information 54A buffered from the host through the CPU 50. One is a pointer for setting a start address of a block area that can be recorded once in one phase, that is, one time without performing a track jump (hereinafter, referred to as a “phase start pointer”), and is another type of pointer. Is a pointer (hereinafter, referred to as a "beam allocation pointer") set for allocating recordable information for each beam in the single phase. This beam allocation pointer is set for each execution beam number.
[0026]
The information required for the above-mentioned pointer setting includes the arrangement of the three beams B0, B1R, and B2, the position of each of the beams, the rotation speed of the disk, and the lock time (the time required for track jump + the time required for PLL lock). (Time + address decoding time based on the wobble signal). The lock time is measured at the time of recording information, and the relationship between the number of rotations of the optical disc and this time is learned by a lock time learning / estimation program to estimate the optimal time.
[0027]
For example, the number of set beams is “Beam_number”, the number of intermittent tracks is “intermittent_number”, the linear velocity during recording is “v (m / s)”, the lock time is “Lock_time (ms)”, and the number of effective beams is “EffectiveBeam_number”. ". In an actual optical disk device, the beam side is fixed and the disk side rotates, but for convenience, it is assumed that the disk side is fixed and the beam side rotates while tracing a track on the disk side. The arrangement of the beams B0, B1R, B2 is as shown in FIG. Further, the beam interval is represented by “d (mm)”, the interval between the beam B0 and the beam B1R is represented by “d01”, and the interval between the beams B1R and B2 is represented by “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. The calculation of the number of effective beams differs between 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]
"In the case of Phase_int" ... The length of a track on which information can be recorded in this phase is represented by the following equation (1). The sum of the track lengths indicated by solid lines L00, L01, and L02 in FIG. 4 corresponds to the equation (1).
(Equation 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 disc, “pi” represents the pi, and “Track_Pitch” records. Indicates the track pitch according to the disc format. “R_base” indicates the radial position of the start block of the user information 54A according to the disc format, and “θ” indicates where the radian has advanced from the angle reference of the polar coordinate conversion of the start block of the user information 54A, and “r_start” Indicates whether or not exists.
[0031]
The various conditions are substituted into the above equation (1), and the maximum value of the effective beam number “EffectiveBeam_number” with respect to the set beam number is set so as to satisfy (residual recording length−recordable length) ≧ 0. Ask. The remaining recording length is obtained by removing the already recorded portion from the track length corresponding to the user information 54A. The above inequality means that the length of a track recordable 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]
If a surplus occurs when the recordable track length is divided by the unit block length, it is moved up or down. Such processing is performed because information is recorded in block units. In this case, if the number of remaining blocks is smaller than the number of blocks moved up or down, this number of remaining blocks is used. For example, this corresponds to a case where information has already been recorded on an optical disc and the remaining recordable capacity is small.
[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]
"In the case of Phase_A" ... The length of a track on which information can be recorded in this phase is represented by the following equation (2). The sum of the track lengths indicated by the solid lines L10, L11, L12 in FIG. 4 corresponds to the equation (2).
(Equation 2)

[0035]
In addition to substituting various conditions into the equation (2), the maximum value of the number of effective beams is obtained within a set beam satisfying (residual recording length−recordable length) ≧ 0. Also in this case, as in the case of the first phase, the recordable length is divided by the length of one block, and if there is a remainder, the data is moved up or down. If the number of remaining blocks is smaller than the number of blocks moved up or down, the 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 recorded in the current phase is determined, and as a result, the recording start pointer PF2 in the next phase is determined. By repeating this operation, it is possible to sequentially determine the recording start pointer of the phase to be continued next.
[0036]
<Setting of beam allocation pointer> A description will be given of a procedure of setting a beam allocation pointer indicating which information is to be recorded by which beam in one phase. As a method of selecting the number of effective beams, two methods are conceivable as shown in FIGS. 5A and 5B. First, in the method shown in FIG. 2A, when two beams exist at the same radius with reference to the reference beam N (when there are a plurality of selectable beams), the beam outside the disk is given priority. It is a method of selecting. For example, when the number of effective beams is “2”, a beam N + 1 outside the reference beam N is selected. On the other hand, the method shown in FIG. 2B is a method of selecting the beam inside the disk with priority. 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, unless the method (B) is used, writing and joining of information will not be successful. In the following description, it is assumed that the method shown in FIG.
[0037]
Among 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 lock time after the track jump is used as a reference. However, in the case of the first phase, the time when the innermost beam of the plurality of execution beams coincides with the recording start position is set as a reference.
[0038]
"In the case of 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, as the allocation pointer, only PB1 is set, 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, the outer beam is selected as shown in FIG. 5A, so that the reference beam B1R and the outer beam B2 are selected. Among these, the allocation pointer PB1 of the reference beam B1R matches 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) in advance as a table so that its polar coordinate value can be instantaneously known.
[Equation 3]

[0040]
From this value, the closest block in the delay direction on the time axis is set as a block to start 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, when the beam B0 coincides with the recording start block of the phase, what polar coordinate positions of the beams B1R and B2 are obtained from the following equation (4). . In this case as well, it is convenient to prepare the calculation results as a table in advance and read them from now on.
(Equation 4)

[0042]
The closest blocks are detected in the time axis delay direction from the polar coordinate positions of the beams B1R and B2, respectively, and are set as 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 executed beams = 3, and the allocation pointer PB0 of the beam B0 is the recording start pointer PF0.
[0043]
"In the case of Phase_A"
(1) In the case where the number of execution beams = 1, the information of the current phase may be continuously recorded without performing a track jump with the beam in which the block whose recording has been completed in the previous phase is written. For example, when information is recorded by three beams in the previous phase, the information of the current phase may be continuously recorded by 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 effective beams = 2, similarly, the reference beam B1R and the outer beam B2 are selected. The recording start block of these beams is based on the polar coordinate position (rbs, θbs) of the recording start block in the phase, and the reference beam position when the lock time elapses is determined with respect to this reference to obtain the beam B1R, The recording start block of B2 is specified. The polar coordinate positions of the beams B1R and B2 leading to the elapse of 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 that is 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 portion after the recording start pointer PFm corresponds to the case where the number of effective beams = 2, and the allocation pointer PB1 of the beam B1R is the recording start pointer PFm.
[0046]
(3) When the number of execution beams = 3, similarly to the case where the number of execution beams = 2, the polar coordinate position (rbs, θbs) of the recording start block of the phase is used as a reference, and the lock The reference beam position at the elapse of time is obtained, and the recording start block of the beams B0, B1R, and B2 is specified. The polar coordinate positions of the beams B0, B1R, and B2 reaching the lock time can be calculated by the following equation (6).
(Equation 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 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 nearest block in the time axis delay direction 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 effective beams = 3, and the allocation pointer PB0 of the beam B0 is the recording start pointer PF1, PF2,.
[0048]
As described above, the execution of the pointer setting program 58 by the CPU 50 sets the phase start pointer and the beam allocation pointer in the user information 54A. In the example shown in FIG. 2, since the recording is performed by three beams B0, B1R, B2 in all of the phases PF0, PF1, PF2,..., The allocation pointers PB0, PB1, PB2 are respectively 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, the user information before the pointers PF0 to PF1 is supplied to the encoder 38, and then the user information before the pointers PF1 to PF2 is supplied to the encoder 38.
[0050]
The encoder 38 performs scramble processing, addition of ECC, modulation, and the like according to the format of the optical disc for each unit of input information, and performs final encoding processing. 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 processed encoded data is separated with reference to the beam allocation pointers PB0, PB1, and PB2 set for each beam. That is, encoded data is allocated to the beam B0 until the pointers PB0 to PB1 appear, to the beam B1R until the pointers PB1 to PB2 appear, and to the beam B2, encoded data from the pointer PB2 to the end of the phase.
[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 from the recording circuit 40 based on the input encoded data, the laser array 12 is driven by the laser driver 14 and the laser array emits light in accordance with 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,. The beam is allocated to each beam with reference to the beam allocation pointers PB0, PB1 and PB2, and is recorded on the optical disk by the corresponding beams B0, B1R and B2.
[0052]
<Process when Error Occurs> By the way, an error may occur during recording. The presence or absence of an error 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. In this monitoring, if it is determined that the bit or mark formation state is not normal, the host side is notified of this. If the recording target is a dye-based disc (write-once type), the information recording is stopped and the disc is ejected.
[0053]
On the other hand, in the case of a phase change disk (rewritable type), recovery processing is possible. First, the information block in which an error has occurred can be known from each of the pointers set in the user information 54A. Therefore, pointer resetting for recovery is performed using the pointer information. This resetting process may be performed by the pointer setting program 58 in the CPU 50 or may be performed by the encoder 38. By performing such a pointer reset, the recording operation can be continued. If an error occurs even after performing the same recovery processing a plurality of times, the host side is notified of the occurrence.
[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 regardless of the already recorded information after the track jump, information recording is started after the lock time has elapsed, so that the recording time is shortened.
(2) A pointer corresponding to each phase and each beam is set in advance in information to be recorded, and information is recorded with reference to the pointer, so that an optimal operation can be performed and the recording time is shortened.
(3) Even if an error occurs during the recording of information, quick recovery processing can be performed by referring to the pointer.
[0055]
<Other Embodiments> The present invention has many embodiments, and various modifications can be made based on the above disclosure. For example, the following is also included.
(1) In the above embodiment, the case where the number of beams is “3” has been described as an example, but the present invention is not limited to this. In the above embodiment, two types of pointers, the phase start pointer and the beam allocation pointer, are set. However, only the phase start pointer may be set.
(2) The device 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 embodiment, the case where information is recorded in units of blocks has been described, but the present invention can be similarly applied to the case where information is recorded in units of sectors.
[0056]
【The invention's effect】
As described above, according to the present invention, since a pointer is set to information to be recorded, recording with a plurality of beams is performed with reference to the pointer, thereby eliminating waste of the recording operation and reducing the recording time. Is shortened, and high-speed recording is enabled.
[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 contents stored in 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 a mode of information recording in the embodiment.
FIG. 5 is a diagram showing 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 and 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: Lock time learning prediction program
60: Pit formation monitoring program
B0, B1R, B2 ... beam
B1R: Reference beam
PF, PB ... pointer

Claims (8)

An information recording method for an optical disc, wherein information is recorded on the optical disc by a plurality of beams,
A first step of calculating the number of effective beams for executing information recording by referring to the amount of information to be recorded and the amount of information that the plurality of beams can record on the optical disk without performing a track jump;
Setting a phase start pointer indicating a recording start position for each phase in which the plurality of beams record information on the optical disk without performing a track jump based on the number of execution beams calculated in the first step; Steps,
A third step of setting a beam allocation pointer indicating a position at which each of the plurality of beams starts recording in the phase based on the number of effective beams calculated in the first step;
An information recording method for an optical disc, comprising: 2. The information recording method for an optical disk according to claim 1, wherein the processing of each step is performed separately in a phase in which information is recorded first and a phase in which the information is continued. 3. The information recording method for an optical disk according to claim 1, further comprising the step of performing a track jump of the light beam in consideration of a preparation time from a track jump to an address detection on the disk. 4. The information recording method for an optical disk according to claim 1, further comprising, when an error occurs during recording of the information, resetting the information using the pointer. An information recording apparatus for an optical disc for recording 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 executing information recording by referring to an information amount of information stored in the memory and an information amount that can be recorded on the optical disk without the plurality of beams performing a track jump. Arithmetic means,
A phase for setting a phase start pointer indicating a recording start position for each phase in which the plurality of beams record information on the optical disk without performing a track jump based on the number of execution beams calculated by the execution beam number calculation means. Start pointer setting means,
Beam allocation pointer setting means for setting a beam allocation pointer indicating a position at which each of the plurality of beams starts recording in the phase based on the number of execution beams calculated by the execution beam number calculation means;
An information recording apparatus for an optical disc, comprising: 6. The optical disk information recording apparatus according to claim 5, wherein the processing of each unit is performed separately in a phase in which information is recorded first and a phase in which the information is continued. 7. The information recording apparatus for an optical disk according to claim 5, wherein the track jump of the light beam is performed in consideration of a preparation time from a track jump to an address detection on the disk. 8. An optical disk information recording apparatus according to claim 5, further comprising a pointer resetting means for resetting the information by using said pointer when an error occurs during the recording of information. .

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