JP3948771B2 - Movement control information recording apparatus, information recording medium, and information reproducing apparatus - Google Patents

Description

この表において、プリピットの有無の欄の「有」は対応するプリピット４が形成されることを示し、「無」は対応するプリピット４が形成されないことを示しており、夫々の「有」、「無」の組合わせは、図８下から４段目乃至最下段に示す偶数記録プリ情報Ｓ_RE又は奇数記録プリ情報Ｓ_ROの波形に対応している。すなわち、レコーディングセクタの先頭のシンクフレームにおいては、それがＥＶＥＮフレームである場合には図８下から４段目に示す偶数記録プリ情報Ｓ_REに対応して全てのプリピット４（プリピットＢ₀ 、Ｂ₁ 及びＢ₂ ）が形成され、レコーディングセクタの先頭のシンクフレームがＯＤＤフレームである場合には図８下から３段目に示す奇数記録プリ情報Ｓ_ROに対応してプリピットＢ₀ 及びＢ₁ のみが形成され、レコーディングセクタの先頭以外のシンクフレームにおいては、当該シンクフレームに記録すべきプリ情報Ｓ_PPが「１」のときには、図８最下段に示す偶数記録プリ情報Ｓ_RE（又は奇数記録プリ情報Ｓ_RO）に対応してプリピットＢ₀ 及びＢ₂ のみが形成され、レコーディングセクタの先頭以外のシンクフレームに記録すべきプリ情報Ｓ_PPが「０」のときには、図８下から２段目に示す偶数記録プリ情報Ｓ_RE（又は奇数記録プリ情報Ｓ_RO）に対応してプリピットＢ₀ のみが形成される。
【００９５】
また、グルーブトラック２のウォブリング周波数については、レコーディングセクタの先頭のシンクフレームにおいては、それがＥＶＥＮフレームである場合には当該ＥＶＥＮフレームの前半のウォブリング周波数がｆ₀ （１４０ｋＨｚ）、後半のウォブリング周波数がｆ₂ （１７５ｋＨｚ）、当該ＥＶＥＮフレームの次のＯＤＤフレームの前半のウォブリング周波数がｆ₀ （１４０ｋＨｚ）、後半のウォブリング周波数がｆ₁ （１０５ｋＨｚ）とされる。更に、レコーディングセクタの先頭のシンクフレームがＯＤＤフレームである場合には、当該ＯＤＤフレームの前半のウォブリング周波数がｆ₀ 、後半のウォブリング周波数がｆ₁ 、当該ＯＤＤフレームの次のＥＶＥＮフレームの前半のウォブリング周波数がｆ₀ 、後半のウォブリング周波数がｆ₂ とされる。また、レコーディングセクタの先頭以外のシンクフレームにおいて、当該シンクフレームに記録すべきプリ情報Ｓ_PPが「１」のときには、当該シンクフレームの内、第１のシンクフレーム（ＥＶＥＮフレーム又はＯＤＤフレームに拘らず）の前半のウォブリング周波数がｆ₀ 、後半のウォブリング周波数がｆ₂ 、第２のシンクフレームの前半のウォブリング周波数がｆ₀ 、後半のウォブリング周波数がｆ₁ とされる。更にまた、レコーディングセクタの先頭以外のシンクフレームにおいて、当該シンクフレームに記録すべきプリ情報Ｓ_PPが「０」のときには、当該シンクフレームの内、第１のシンクフレーム（ＥＶＥＮフレーム又はＯＤＤフレームに拘らず）の前半のウォブリング周波数がｆ₀ 、後半のウォブリング周波数がｆ₁ 、第２のシンクフレームの前半のウォブリング周波数がｆ₀ 、後半のウォブリング周波数がｆ₂ とされる。このようにウォブリング周波数を組合わせることにより、後述の情報記録装置において、夫々のシンクフレームにおけるウォブリング周波数ｆ₀ の部分を移動制御情報として検出することでスピンドルモータの回転制御のための信号が検出されると共に、更にウォブリング周波数ｆ₁ 又はｆ₂ の部分を制御情報として検出することでその組合わせによりプリ情報Ｓ_PP（本実施形態においては、二つのシンクフレームで一のプリ情報Ｓ_PPが記録されることとなる。）が検出される。
【００９６】
そして、グルーブトラック２のウォブリング周波数を表１に示す組合わせとするべく上記ウォブリング信号Ｓ_W を出力するためのテーブルがＲＯＭ４７に記憶されており、上記カウント信号Ｓ_C 及びプリ情報Ｓ_PPに基づいて当該テーブルの内容をウォブリング信号Ｓ_W として出力する。なお、具体的なＲＯＭ４７における記憶の形態としては、例えば、プリ情報Ｓ_PPをアドレスデータにおけるＭＳＢ（Most Significant Bit）とし、カウント信号Ｓ_C をアドレスデータにおけるＭＳＢ以外の桁（２ＳＢ、３ＳＢ……ＬＳＢ）として使用し、ＲＯＭ４７内のアドレス「００００」から「０ＦＦＦ」に二つのシンクフレームについての「ｆ₀ 」−「ｆ₁ 」−「ｆ₀ 」−「ｆ₂ 」というデータを記憶しておき、アドレス「１０００」から「１ＦＦＦ」に二つのシンクフレームについての「ｆ₀ 」−「ｆ₂ 」−「ｆ₀ 」−「ｆ₁ 」というデータを記憶しておき、入力されるプリ情報Ｓ_PPとカウンタ信号Ｓ_C に基づいてこれらのうちのいずれかをウォブリング信号Ｓ_W として読み出せばよい。
より具体的には、例えば、プリ情報Ｓ_PPが「０」の場合、カウンタ４５のカウント値が「０」、「７４４」、「１４８８」及び「２２３２」のときに、夫々の値に対応するカウント信号Ｓ_C を出力する。これは、カウント値が「０」（ＥＶＥＮフレームの先頭）から「７４４」（ＥＶＥＮフレームの半分の位置）までの間と「１４８８」（ＯＤＤフレームの先頭）から「２２３２」（ＯＤＤフレームの半分の位置）までの間におけるグルーブトラック２のウォブリング周波数を図２に示すように一定ウォブリング周波数ｆ₀ とすると共に、カウント値が「７４４」から「１４８８」の間におけるグルーブトラック２のウォブリング周波数を例えば図２に示す周波数ｆ₁ とし、更にカウント値が「２２３２」から次に初期化されるまでの間におけるグルーブトラック２のウォブリング周波数を例えば図２に示す周波数ｆ₂ とするデータが記憶されるのである。
【００９７】
なお、プリ情報Ｓ_PPが「１」の場合には、カウンタ４５のカウント値が「７４４」から「１４８８」の間におけるウォブリング周波数をｆ₂ とし、カウント値が「２２３２」から次に初期化されるまでの間におけるウォブリング周波数をｆ₁ とするデータが記憶されている。
【００９８】
この後、当該ウォブリング信号Ｓ_W がＤ／Ａ変換器４７によりアナログ信号に変換され、当該アナログ信号に変換されたウォブリング信号Ｓ_W に基づく電磁石３５と永久磁石３６の動作により、光変調器２５がスタンパディスクの半径方向に移動（振動）され、これにより、所望の周波数でウォブリングするグルーブトラック２が形成されると共に、シンクフレームの先頭にプリピット４が形成されることとなる。また、同時に、ウォブリング周波数ｆ₀ の部分における最大振幅の位置にプリピット４が形成されることとなる。
【００９９】
以上説明した本実施形態のカッティング装置Ｃの動作について、その特徴となる部分を纏めると、本実施形態のカッティング装置Ｃのうち、特にＯＤＤ・ＥＶＥＮ判定用ゲート信号発生器４１及び判定器４２の動作により、スタンパディスクにおける一回転前のプリピット４の位置（通常はＥＶＥＮフレーム位置に記録されている）が次の回転におけるプリピット４の位置に近い場合、より具体的には、一回転前のプリピット４の位置の情報を含んだゲート信号Ｓ_G の範囲に当該次の回転におけるＥＶＥＮフレーム信号Ｓ_E が入ることが判定器４２において判定された場合には、当該次の回転におけるプリピット４はＯＤＤフレーム信号Ｓ_O の位置に記録されるように記録プリ情報Ｓ_R が生成され、これに基づいて光変調器２５により光ビームＬ_L が変調され、プリピット４を含むランドトラック３がＤＶＤ−Ｒ１に形成される。このとき、当該光ビームＬ_L と同時に出力される光ビームＬ_G によりランドトラック３に並行するようにグルーブトラック２が形成される。更に、ウォブリング信号Ｓ_W に基づく光変調器２５の移動により、光ビームＬ_G がウォブリングしつつ照射され、各プリピット４及び記録すべきプリ情報Ｓ_PPに対応したウォブリング周波数でグルーブトラック２が形成される。
【０１００】
以上説明したように、本実施形態のカッティング装置Ｃによれば、全てのシンクフレームに対応するグルーブトラック２について、相互に同じ位置（前半部）におけるウォブリングの周波数が予め設定された所定の一定ウォブリング周波数ｆ₀ となっているので、記録情報の記録時において、当該一定ウォブリング周波数ｆ₀ を検出し、これに基づいてＤＶＤ−Ｒ１の回転を制御すれば、シンクフレーム毎の周期で正確に検出される一定ウォブリング周波数ｆ₀ に基づいて回転制御することとなり、記録情報の記録におけるＤＶＤ−Ｒ１の回転を正確に制御することができる。
【０１０１】
また、一のシンクフレーム内のグルーブトラック２として、一定ウォブリング周波数ｆ₀ のグルーブトラック２に加えて記録すべきプリ情報Ｓ_PPに対応したウォブリング周波数ｆ₁ 又はｆ₂ のグルーブトラック２が形成されるので、記録情報の記録時において、当該プリ情報Ｓ_PPに対応したウォブリング周波数がシンクフレーム毎の周期で正確に検出されることとなり、ＤＶＤ−Ｒ１の回転制御を正確に行いつつ記録情報の記録に必要なアドレス情報等を取得することができる。
【０１０２】
更に、一のシンクフレーム内のグルーブトラック２について、上記一定ウォブリング周波数ｆ₀ でウォブリングされている領域が当該一のシンクフレーム内のグルーブトラック２の前半部分であるので、グルーブトラック２の形成処理を簡略化することができ、更に、記録情報の記録時において一定ウォブリング周波数ｆ₀ とプリ情報Ｓ_PPに対応したウォブリング周波数ｆ₁ 又はｆ₂ の双方を確実に検出することができる。
【０１０３】
更にまた、グルーブトラック２のウォブリングに加えて、プリピット４によってもプリ情報Ｓ_PPが記録されるので、ウォブリングにより記録されたプリ情報Ｓ_PP又はプリピット４により記録されたプリ情報Ｓ_PPのうちのいずれか一方が検出されない場合でも、確実にＤＶＤ−Ｒ１の回転を制御することができる。
【０１０４】
更に、実施形態のカッティング装置Ｃによれば、ＤＶＤ−Ｒ１における一回転前のＥＶＥＮフレーム位置に記録されたプリピット４の位置が次の回転におけるプリピット４の位置の近い場合には、当該次の回転においては、ＯＤＤフレームの位置にプリピット４が形成され、更にそのまま一回転した後は、元のＥＶＥＮフレーム位置にプリピット４が形成されるので、隣り合うランドトラック３においては、プリピット４の位置が重なることがなく、後述の記録情報の記録におけるプリ情報Ｓ_PPの検出において、一のランドトラック３上のプリ情報Ｓ_PPを読み取る際に、隣り合うランドトラック３のプリ情報Ｓ_PPが洩れ込むことを防止することができ、正確なプリ情報Ｓ_PPの読み取りを行うことができる。
【０１０５】
なお、このとき、ゲート信号Ｓ_G が、スタンパディスクにおける一回転毎のランドトラック３の一周に対応する長さの増加分Δを含んだ長さ（１４Ｔ＋Δ）のパルス幅とされているので、スタンパディスク上の半径位置の変化により隣合うランドトラック３上のプリピット４の位置が近接することがない。従って、スタンパディスク上のいずれの部分においても、隣合うランドトラック３上のプリピット４の位置を半径方向の同一直線上にない位置とすることができる。
【０１０６】
また、一のシンクフレーム中におけるウォブリング周波数がｆ₀ である区間の長さは、上述した１／２シンクフレーム分に限られるものではなく、上記プリピット４に対応して、少なくとも三のプリピット４（上記プリピットＢ₀ 乃至Ｂ₂ ）が形成される区間のウォブリング周波数がｆ₀ であれば一シンクフレーム分以内のいずれの長さであってもよい。
（II）情報記録装置の実施形態
次に、本発明に係る情報記録装置の実施の形態について、図１０乃至図１２に基づいて説明する。なお、以下の説明は、ホストコンピュータから送信されてくるディジタル情報を上記ＤＶＤ−Ｒ１に対して記録するための情報記録装置について本発明を適用した実施の形態を説明するものである。
【０１０７】
始めに、本実施形態に係る情報記録装置の全体構成及び動作について、図１０を用いて説明する。なお、以下の実施の形態では、ＤＶＤ−Ｒ１において、当該ＤＶＤ−Ｒ１上のアドレス情報等を含む上記プリピット４及びウォブリングされたグルーブトラック２が予め形成されており、ディジタル情報の記録時には、当該プリピット４及びグルーブトラック２のウォブリング周波数を予め検出することによりＤＶＤ−Ｒ１上のアドレス情報を得、これによりディジタル情報を記録するＤＶＤ−Ｒ１上の記録位置を検出して記録するものとする。
【０１０８】
図１０に示すように、実施形態の情報記録装置Ｓは、ピックアップ手段、記録手段としてのピックアップ７６と、再生増幅器７７と、デコーダ７８と、プリピット信号デコーダ７９と、駆動手段としてのスピンドルモータ８０と、駆動信号生成手段としてのサーボ回路８１と、プロセッサ８２と、エンコーダ８３と、パワー制御回路８４と、レーザ駆動回路８５と、インターフェース８６と、フィルタ８８と、波形整形器８９と、抽出手段としての制御信号抽出器９０とにより構成されている。また、当該情報記録装置Ｓには、外部のホストコンピュータ８７から記録すべきディジタル情報Ｓ_RRがインターフェース８６を介して入力されている。
【０１０９】
次に、全体の動作を説明する。
ピックアップ７６は、図示しないレーザダイオード、偏向ビームスプリッタ、対物レンズ、光検出器等を含み、レーザ駆動信号Ｓ_DLに基づいて光ビームＢをＤＶＤ−Ｒ１の情報記録面に照射し、その反射光に基づいてラジアルプッシュプル方式により上記プリピット４及びグルーブトラック２のウォブリング周波数を検出して記録すべきディジタル情報Ｓ_RRを記録すると共に、既に記録されているディジタル情報がある場合には、上記光ビームＢの反射光に基づいて当該既に記録されているディジタル情報を検出する。
【０１１０】
そして、再生増幅器７７は、ピックアップ７６から出力されたプリピット４及びグルーブトラック２のウォブリング周波数に対応する情報を含む検出信号Ｓ_DTを増幅し、プリピット４及びグルーブトラック２のウォブリング周波数に対応するプリ情報信号Ｓ_PPP を出力すると共に、既に記録されているディジタル情報に対応する増幅信号Ｓ_P を出力する。
【０１１１】
その後、デコーダ７８は、増幅信号Ｓ_P に対して８−１６復調及びデインターリーブを施すことにより当該増幅信号Ｓ_P をデコードし、復調信号Ｓ_DM及びサーボ復調信号Ｓ_SDを出力する。
【０１１２】
一方、プリ情報信号デコーダ７９は、プリ情報信号Ｓ_PPP に含まれるプリピット４を検出して得られた信号のみをデコードして復調プリピット信号Ｓ_PDを出力する。
【０１１３】
そして、サーボ回路８１は、復調プリピット信号Ｓ_PD及びサーボ復調信号Ｓ_SDに基づいて、ピックアップ７６におけるフォーカスサーボ制御及びトラッキングサーボ制御のためのピックアップサーボ信号Ｓ_SPを出力する。更に、サーボ回路８１は、後述のスピンドルサーボ信号Ｓ_SPS に基づいてスピンドルサーボ制御信号Ｓ_SSを出力してスピンドルモータ８０の回転をサーボ制御する。
【０１１４】
これらと並行して、プロセッサ８２は、復調信号Ｓ_DMに基づいて既に記録されていたディジタル情報に対応する再生信号Ｓ_OTを外部に出力すると共に、情報記録装置Ｓ全体を主として制御する。
【０１１５】
一方、インターフェース８６は、プロセッサ８２の制御の下、ホストコンピュータ８７から送信されてくるディジタル情報Ｓ_RRに対して、これを情報記録装置Ｓに取り込むためのインターフェース動作を行い、当該ディジタル情報Ｓ_RRをエンコーダ８３に出力する。
【０１１６】
そして、エンコーダ８３は、図示しないＥＣＣジェネレータ、８−１６変調部、スクランブラ等を含み、ディジタル情報Ｓ_RRに基づいて、再生時のエラー訂正を行う単位であるＥＣＣブロックを構成すると共に、当該ＥＣＣブロックに対してインターリーブ及び８−１６変調並びにスクランブル処理を施し、変調信号Ｓ_REE を生成する。
【０１１７】
その後、パワー制御回路８４は、変調信号Ｓ_REE に基づいて、ピックアップ７６内の図示しないレーザダイオードの出力を制御するための記録信号Ｓ_D を出力する。
【０１１８】
更にレーザ駆動回路８５は、記録信号Ｓ_D に基づいて、実際に上記レーザダイオードを駆動して光ビームＢを出射させるための上記レーザ駆動信号Ｓ_DLを出力する。
【０１１９】
一方、フィルタ８８は、プリ情報信号Ｓ_PPP に含まれるグルーブトラック２のウォブリング周波数のみを抽出し、夫々のウォブリング周波数（上記周波数ｆ₀ 、ｆ₁ 及びｆ₂ ）に対応する抽出信号Ｓ_P1を出力する。
【０１２０】
そして、当該抽出信号Ｓ_P1は、波形整形器８９に出力され、抽出信号Ｓ_P1に含まれる雑音等が除かれてもとの各ウォブリング周波数を有する整形信号Ｓ_P2が出力される。
【０１２１】
最後に、制御信号抽出器９０は、整形信号Ｓ_P2に基づいて、上記スピンドルサーボ信号Ｓ_SPS を出力すると共に、整形信号Ｓ_P2にウォブリング周波数の組合わせとして含まれるアドレス情報をアドレス信号Ｓ_DTT としてプロセッサ８２に出力する。
【０１２２】
なお、上記の情報記録装置Ｓは、ＤＶＤ−Ｒ１に記録されている情報を再生することも可能であり、その際には、復調信号Ｓ_DMに基づいてプロセッサ８２を介して再生信号Ｓ_OTが外部に出力されることとなる。
【０１２３】
次に、本発明に係るフィルタ８８、波形整形器８９及び制御信号抽出器９０の細部構成について図１１を用いて説明する。
図１１に示すように、フィルタ８８は、アナログ信号であるプリ情報信号Ｓ_PPP をディジタル信号に変換するＡ／Ｄ変換器９１と、ディジタル化されたプリ情報信号Ｓ_PPP から上記ウォブリング周波数を抽出するための、１０５ｋＨｚ乃至１７５ｋＨｚの周波数を有するプリ情報信号Ｓ_PPP のみを通過させるバンドパスフィルタ９２とにより構成されている。
【０１２４】
また、波形整形器８９は、スイッチ９４と、ディレイ回路９５と、ウインドウコンパレータ９６と、予測演算器９３とにより構成されている。
更に、制御信号抽出器９０は、コンパレータ９７と、エッジ抽出器９８と、カウンタ９９と、ホールド器１００と、ウインドウコンパレータ／コンパレータ１０１と、データ判定回路１０２とにより構成されている。
【０１２５】
次に、図１１及び図１２を用いてフィルタ８８、波形整形器８９及び制御信号抽出器９０の動作について説明する。
再生増幅器７７から出力されたプリ情報信号Ｓ_PPP はフィルタ８８に入力され、ディジタル信号に変換された後、グルーブトラック２のウォブリング周波数に対応する周波数成分のみが抽出され、抽出信号Ｓ_P1として出力される。
【０１２６】
そして、当該抽出信号Ｓ_P1は、波形整形器８９におけるスイッチ９４（通常は抽出信号Ｓ_P1側に切り換えられている。）に出力されると共に、ディレイ回路９５及びウインドウコンパレータ９６に出力される。そして、当該抽出信号Ｓ_P1をディレイ回路９５により所定時間遅延させ、当該遅延させた信号の振幅と現在の抽出信号Ｓ_P1の振幅とをウインドウコンパレータ９６により比較して当該遅延させた信号と現在の抽出信号Ｓ_P1との振幅の差を検出し、その差が予め設定された所定の値より大きいときはスイッチ９４を抽出信号Ｓ_P1側から後述の予測演算器９３の出力信号側に切り換える。この動作は、図１２最上段に示すように、抽出信号Ｓ_P1にはグルーブトラック２に隣接しているランドトラック３上のプリピット４によるインパルス状のノイズ（図１２最上段において、実線矢印で示す。）が含まれており、これを取り除くために、遅延させた信号と現在の抽出信号Ｓ_P1とを上記ウインドコンパレータ９６において比較し、その差が上記所定の値以上であるときは現在の抽出信号Ｓ_P1には上記インパルス状ノイズが含まれているとして、当該現在の抽出信号Ｓ_P1をスイッチ９４から整形信号Ｓ_P2として出力せずに、これに代えて予測演算器９３の出力信号を整形信号Ｓ_P2として出力するためである。
【０１２７】
ここで、上記予測演算器９３は、一又は数サンプル前の抽出信号Ｓ_P1の振幅の平均値から現在の抽出信号Ｓ_P1の振幅値を予測して出力するものであり、例えば、
（１つ前のサンプルにおける振幅値）＋（平均変化分）＝（現在の抽出信号Ｓ _P1の振幅値）
という演算を行い、算出された現在の振幅値をスイッチ９４に出力するものである。
【０１２８】
このようにしてインパルス状ノイズが除去された抽出信号Ｓ_P1は、整形信号Ｓ_P2として制御信号抽出器９０に出力される。
そして、制御信号抽出器９０中のコンパレータ９７は、整形信号Ｓ_P2を二値化して、その周波数（ウォブリング周波数）の変化に対応した三種類のパルス長を有する比較信号Ｓ_P3を出力する。これにより、エッジ抽出器９８は、当該比較信号Ｓ_P3のエッジを抽出し、図１２に示すように元のウォブリング周波数に対応した三種類の間隔を有するエッジ信号Ｓ_P4を出力する。このエッジ信号Ｓ_P4は、カウンタ９９、ホールド器１００、ウインドウコンパレータ／コンパレータ１０１及びデータ判定回路１０２に出力されている。
【０１２９】
エッジ信号Ｓ_P4が入力されるカウンタ９９は、当該エッジ信号Ｓ_P4をトリガ信号として別途入力されているクロック信号ＣＬＫをカウントし、エッジ信号Ｓ_P4が入力される度にそのときのカウント値をカウント信号Ｓ_P5として出力する。このカウント信号Ｓ_P5には、上記元のウォブリング周波数対応して三種類の値（図１２において「Ｋ」、「Ｌ」及び「Ｍ」で示す。）が含まれることとなる。その後、当該カウント信号Ｓ_P5が入力されているホールド器１００は、エッジ信号Ｓ_P4に基づいてカウント信号Ｓ_P5の夫々の値をホールドし、カウント信号Ｓ_P5に含まれる三種類の値に対応した三値のレベルを有するホールド信号Ｓ_P6を出力する。そして、当該ホールド信号Ｓ_P6が入力されているウインドウコンパレータ／コンパレータ１０１は、エッジ信号Ｓ_P4に基づいて、入力されたホールド信号Ｓ_P6を、カウント信号Ｓ_P5における元のウォブリング周波数ｆ₀ に対応するレベルと、カウント信号Ｓ_P5におけるそれ以外の値に対応するレベルの二種類のレベルを有するスピンドルサーボ信号Ｓ_SPS を生成し、サーボ回路８１に出力する。このスピンドルサーボ信号Ｓ_SPS は、プリ情報Ｓ_PPの値に拘らず、正確に一シンクフレーム分の周期を有する信号であるので、当該波形を有するスピンドルサーボ信号Ｓ_SPS をサーボ回路８１に出力し、これと予め設定された基準信号とを比較すれば、現在のＤＶＤ−Ｒ１の回転数の基準値からのずれが正確に検出できる。
【０１３０】
一方、これと並行してウインドウコンパレータ／コンパレータ１０１は、入力されたホールド信号Ｓ_P6における三種類のレベルから元のウォブリング周波数により記録されていたアドレス信号（「０」又は「１」に対応した１０５ｋＨｚの周波数又は１７５ｋＨｚを示す信号）Ｓ_P7をデータ判定回路１０２に出力する。
【０１３１】
そして、データ判定回路１０２は、アドレス信号Ｓ_P7及び復調プリピット信号Ｓ_PDに基づいて、当該復調プリピット信号Ｓ_PDにより現在検出しているのがＥＶＥＮフレームであることが認識され、且つ、アドレス信号Ｓ_P7により現在検出しているウォブリング周波数が１７５ｋＨｚであるときは現在検出されているプリ情報Ｓ_PPが「１」であるとしてこれを示すアドレス信号Ｓ_DTT をプロセッサ８２に出力する。一方、復調プリピット信号Ｓ_PDにより現在検出しているのがＥＶＥＮフレームであることが認識され、且つ、アドレス信号Ｓ_P7により現在検出しているウォブリング周波数が１０５ｋＨｚであるときは現在検出されているプリ情報Ｓ_PPが「０」であるとしてこれを示すアドレス信号Ｓ_DTT をプロセッサ８２に出力する。
【０１３２】
また、データ判定回路１０２は、復調プリピット信号Ｓ_PDにより現在検出しているのがＯＤＤフレームであることが認識され、且つ、アドレス信号Ｓ_P7により現在検出しているウォブリング周波数が１７５ｋＨｚであるときは現在検出されているプリ情報Ｓ_PPが「０」であるとしてこれを示すアドレス信号Ｓ_DTT をプロセッサ８２に出力する。一方、復調プリピット信号Ｓ_PDにより現在検出しているのがＯＤＤフレームであることが認識され、且つ、アドレス信号Ｓ_P7により現在検出しているウォブリング周波数が１０５ｋＨｚであるときは現在検出されているプリ情報Ｓ_PPが「１」であるとしてこれを示すアドレス信号Ｓ_DTT をプロセッサ８２に出力する。
【０１３３】
そして、アドレス信号Ｓ_DTT が入力されたプロセッサ８２は、当該アドレス信号Ｓ_DTT と復調プリピット信号Ｓ_PDに基づいて、現在ディジタル情報Ｓ_RRを記録しようとしているＤＶＤ−Ｒ１上のアドレス情報を取得することとなる。
【０１３４】
なお、アドレス信号Ｓ_DTT と復調プリピット信号Ｓ_PDには、同じアドレス情報が含まれていることとなるが、この使い分けについては、通常は、復調プリピット信号Ｓ_PDに基づいてアドレス情報を取得すると共にアドレス信号Ｓ_DTT を予備とし、ノイズ等により復調プリピット信号Ｓ_PDが検出されないときにのみアドレス信号Ｓ_DTT に基づいてアドレス情報を取得する。
【０１３５】
以上説明したように、本実施形態の情報記録装置Ｓによれば、プリ情報Ｓ_PPの値に拘らず、正確に一シンクフレーム分の周期を有する信号であるスピンドルサーボ信号Ｓ_SPS に基づいて現在のＤＶＤ−Ｒ１の回転数の基準値からのずれを正確に検出し、スピンドルサーボ制御信号Ｓ_SSを生成してスピンドルモータ８０を回転制御するので、ＤＶＤ−Ｒ１の実際の回転数に対応した正確な回転制御が可能となる。
【０１３６】
また、ＤＶＤ−Ｒ１上のグルーブトラック２のウォブリングによりプリ情報Ｓ_PPも記録されているので、ＤＶＤ−Ｒ１の回転制御を正確に行いつつ記録情報の記録に必要なアドレス情報を取得することができる。
【０１３７】
更に、一シンクフレームの前半部分が一定ウォブリング周波数ｆ0 とされ、後半部分がプリ情報Ｓ_PPに対応したウォブリング周波数とされているので、双方を確実に検出して記録情報を記録することができる。
【０１３８】
更にまた、ＤＶＤ−Ｒ１にプリピット４によってもプリ情報Ｓ_PPが記録されているので、ウォブリングにより記録された回転制御のためのプリ情報Ｓ_PP又はプリピット４により記録された回転制御のためのプリ情報Ｓ_PPのうちのいずれか一方が検出されない場合でも、確実にＤＶＤ−Ｒ１の回転を制御して情報を記録することができる。
【０１３９】
なお、上記の各実施形態は、ＤＶＤ−Ｒ１について本発明を適用した場合について説明したが、これに限らず、トラックのウォブリングにより移動制御のための情報を検出する記録媒体（例えば、テープ状記録媒体等）に対して、所定の情報単位毎の情報を記録する場合に広く適用することができる。
【図面の簡単な説明】
【図１】実施形態のＤＶＤ−Ｒの構成の一例を示す斜視図である。
【図２】実施形態のＤＶＤ−Ｒにおける記録フォーマットの一例を示す図である。
【図３】実施形態のカッティング装置の概要構成を示すブロック図である。
【図４】実施形態のプリフォーマット用エンコーダの概要構成を示すブロック図である。
【図５】実施形態のフレーム信号発生器及びＯＤＤ・ＥＶＥＮ判定用ゲート信号発生器の概要構成を示すブロック図である。
【図６】実施形態の記録プリ情報発生器及びビットタイミング発生器の概要構成を示すブロック図であり、（ａ）は記録プリ情報発生器の概要構成を示すブロック図であり、（ｂ）はビットタイミング発生器の概要構成を示すブロック図である。
【図７】プリフォーマット用エンコーダの動作を示すタイミングチャートであり、（ａ）はＥＶＥＮフレーム信号及びＯＤＤフレーム信号を示すタイミングチャートであり、（ｂ）は判定器の動作を示すタイミングチャートである。
【図８】記録プリ情報発生器の動作を示すタイミングチャートである。
【図９】フレーム信号発生器及びＯＤＤ・ＥＶＥＮ判定用ゲート信号発生器の動作を示すタイミングチャートである。
【図１０】情報記録装置の概要構成を示すブロック図である。
【図１１】フィルタ、波形整形器及び制御信号抽出器の細部構成を示すブロック図である。
【図１２】フィルタ、波形整形器及び制御信号抽出器の動作を示すタイミングチャートである。
【符号の説明】
１…ＤＶＤ−Ｒ
２…グルーブトラック
３…ランドトラック
４…プリピット
５…色素膜
６…金蒸着膜
７…保護層
２０…データ生成部
２１…パラレル／シリアル変換器
２２…プリフォーマット用エンコーダ
２３…クロック信号発生部
２４、２４G 、２４L …レーザ発生装置
２５…光変調器
２６…対物レンズ
２７…ガラス基盤
２８…レジスト
２９、８０…スピンドルモータ
３０…回転検出器
３１…回転サーボ回路
３２…送りユニット
３３…位置検出器
３４…送りサーボ回路
４０…フレーム信号発生器
４１…ＯＤＤ・ＥＶＥＮ判定用ゲート信号発生器
４２…判定器
４３…スイッチ
４４…記録プリ情報発生器
４４Ｅ…ＥＶＥＮ部
４４Ｏ…ＯＤＤ部
４５、５４、７４、９９…カウンタ
４６…ＲＯＭ
４７…Ｄ／Ａ変換器
５０…ＯＤＤフレーム用カウンタ
５１…ＥＶＥＮフレーム用カウンタ
５２、５３、５５、７５、７８…デコーダ
６０…ラッチ回路
６１…ゲート用カウンタ
６２…モノマルチバイブレータ
６５、７０…ビットタイミング発生器
６６、６８、７１、７２…ＡＮＤ回路
６７、６９、７３…ＯＲ回路
７６…ピックアップ
７７…再生増幅器
７９…プリピット信号デコーダ
８１…サーボ回路
８２…プロセッサ
８３…エンコーダ
８４…パワー制御回路
８５…レーザ駆動回路
８６…インターフェース
８７…ホストコンピュータ
８８…フィルタ
８９…波形整形器
９０…制御信号抽出器
９１…Ａ／Ｄ変換器
９２…バンドパスフィルタ
９３…予測演算器
９４…スイッチ
９５…ディレイ回路
９６…ウインドウコンパレータ
９７…コンパレータ
９８…エッジ抽出器
１００…ホールド器
１０１…ウインドウコンパレータ／コンパレータ
１０２…データ判定器
Ｃ…カッティング装置
ＣＬＫ…クロック信号
Ｓ…情報記録装置
ＬL 、ＬG 、Ｂ…光ビーム
ＳＰ…光スポット
Ｓ_PP…プリ情報
Ｓ_R …記録プリ情報
Ｓ_S …一回転検出信号
Ｓ_E …ＥＶＥＮフレーム信号
Ｓ_EC…ＥＶＥＮフレームカウント信号
Ｓ_O …ＯＤＤフレーム信号
Ｓ_OC…ＯＤＤフレームカウント信号
Ｓ_J …判定信号
Ｓ_C 、Ｓ_CC、Ｓ_CCC 、Ｓ_P5…カウント信号
Ｓ_W …ウォブリング信号
Ｓ_G …ゲート信号
Ｓ_H …先頭フレーム信号
Ｓ_RE…偶数記録プリ情報
Ｓ_RO…奇数記録プリ情報
Ｓ_GC…ゲート用カウント信号
Ｓ_B0、Ｓ_B1、Ｓ_B2…タイミング信号
Ｓ_RR…ディジタル情報
Ｓ_REE …変調信号
Ｓ_D …記録信号
Ｓ_DT…検出信号
Ｓ_DL…レーザ駆動信号
Ｓ_OT…再生信号
Ｓ_P …増幅信号
Ｓ_PPP …プリピット信号
Ｓ_DM…復調信号
Ｓ_SD…サーボ復調信号
Ｓ_PD…復調プリピット信号
Ｓ_SP…ピックアップサーボ信号
Ｓ_SPS …スピンドルサーボ信号
Ｓ_SS…スピンドルサーボ制御信号
Ｓ_DTT 、Ｓ_P7…アドレス信号
Ｓ_P1…抽出信号
Ｓ_P2…整形信号
Ｓ_P3…比較信号
Ｓ_P4…エッジ信号
Ｓ_P6…ホールド信号[0001]
BACKGROUND OF THE INVENTION
The present invention additionally serial capable WO (Write Once) type recording medium (hereinafter, DVD-R (DVD-Recordable ) that.) In the control information of the recording medium (hereinafter, referred to as pre-information.) Prerecorded movement control information recording apparatus for, belonging to the technical field of information recording medium body and an information reproducing apparatus.
[0002]
[Prior art]
Conventionally, as a recording medium in which pre-information is recorded in advance as described above and information can be additionally recorded based on the pre-information, a CD-R (CD-Recordable) which is an optical disc having a recording capacity comparable to that of a CD. It has been known.
[0003]
When the pre-information is recorded on the CD-R, a track (groove track or land track) on which recording information is recorded is recorded in advance at the pre-format stage at the time of manufacturing the CD-R. The pre-information is recorded by wobbling the information in a waveform at a frequency corresponding to a signal obtained by modulating the information in advance with FM (Frequency Moduration).
[0004]
When recording information is actually recorded on a conventional CD-R, the wobbling frequency of the wobbling track is detected, and a reference clock for controlling the rotation of the CD-R based on this is detected. A drive signal for controlling the rotation of the spindle motor that extracts and rotates the CD-R based on the extracted reference clock is generated.
[0005]
[Problems to be solved by the invention]
However, in the method of controlling the rotation of the CD-R based on the pre-information recorded by the conventional wobbling, the wobbling frequency of the track is changed to the position on the CD-R corresponding to the change of the content of the pre-information to be recorded. Therefore, the control for extracting the reference clock by taking the average value of these frequencies has been performed. However, according to this, there is a problem that the rotation control with high accuracy at the time of recording the record information cannot be performed.
[0006]
That is, for example, an average value of wobbling frequencies in an area where “0” and “1” should be alternately recorded continuously as pre-information, and an average value of wobbling frequencies in an area where only “0” is continuous as pre-information. The average value of the wobbling frequency in a region where only “1” is continuous as pre-information is naturally different. Accordingly, when the reference clock is extracted based on these average values, the frequency of the extracted reference clock also varies depending on the position of the CD-R, thereby making it impossible to perform highly accurate rotation control.
[0007]
Therefore, the present invention has been made in view of the above-mentioned problems, and the problem is that the accuracy of rotation control of the recording medium when recording the recording information on the recording medium on which the pre-information is recorded by wobbling. It is an object to provide a pre-information recording apparatus, a recording medium on which pre-information is recorded, and an information recording apparatus.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, the invention according to claim 1 provides movement control information for controlling a moving speed of the recording medium when recording information to be recorded on the recording medium. A movement control information recording apparatus for recording on a recording medium by wobbling a track such as a groove track formed on the recording medium, which is an information unit such as a sync frame in the recording information and controls the moving speed A preformat for generating a specific wobbling signal for wobbling a part of the track in the information unit, which is the track formed in the area in which the information unit corresponding to the period to be recorded is to be recorded, at a predetermined constant frequency Specific wobbling signal generation means, such as an encoder, and the information based on the generated specific wobbling signal. Comprising a recording unit of the optical modulator or the like for recording the movement control information by wobbling a portion of the units in the track by the predetermined frequency, wherein the specific wobbling signal generating means, all of the on the recording medium For the intra-information unit track, the specific wobbling signal is generated so that the wobbling frequency at the same position is the constant frequency.
[0009]
In order to solve the above-mentioned problem, the invention according to claim 4 is an information recording medium in which a track composed of a plurality of units such as a wobbled and preset sync frame is formed in advance. This corresponds to a period for controlling the moving speed of the information recording medium when recording information on the information recording medium, and the wobbling shapes of the same region in each unit are the same. der is, and each said region is configured so that is wobbled respectively at a constant wobbling frequency set in advance.
[0010]
In order to solve the above problems, the invention according to claim 6 is an information recording medium in which a track composed of a plurality of units such as a wobbling and a preset sync frame is formed in advance. This corresponds to a cycle for controlling the moving speed of the information recording medium when information is recorded on the information recording medium, and the wobbling shapes of the same area in each unit are the same. Ah is, and each said region is an information reproducing apparatus for reproducing information recorded on the information recording medium that is wobbled respectively at a constant wobbling frequency set in advance, irradiating a light beam to the track And a pickup means such as a pickup for outputting a detection signal based on the reflected light from the track of the light beam, and the detection signal. And a extracting means such filter for extracting information.
[0052]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to the drawings.
(I) Embodiment of movement control information recording apparatus and recording medium First, pre-pits corresponding to the pre-information are formed and the pre-information is obtained by wobbling a groove track described later corresponding to the pre-information. A cutting apparatus which is an embodiment of the movement control information recording apparatus of the present invention for recording on a DVD-R as a recording medium will be described with reference to FIGS. In the following description of the embodiment of the cutting apparatus, an embodiment of a DVD-R as a recording medium in which prepits are formed by the cutting apparatus and the groove track is wobbled will also be described.
[0053]
First, the structure of a DVD-R in which prepits are formed and groove tracks are wobbled by a cutting apparatus according to this embodiment described later will be described with reference to FIG.
[0054]
In FIG. 1, a DVD-R 1 is a dye-type DVD-R having a dye film 5 and capable of writing information only once. The groove track 2 as a track and the groove track 2 as reproduction light or recording light A land track 3 as an adjacent track for guiding a light beam B such as a laser beam is formed by a cutting device described later. Further, a protective film 7 for protecting them and a gold vapor deposition film 6 for reflecting the light beam B when reproducing recorded information are provided. A pre-pit 4 corresponding to the pre-information is formed on the land track 3 by a cutting device described later. This pre-pit 4 is formed in advance before the DVD-R 1 is shipped.
[0055]
Further, in the DVD-R 1, pre-information having the same contents as the pre-pit 4 is recorded by wobbling the groove track 2 at a frequency corresponding to pre-information to be recorded and a predetermined constant wobbling frequency described later. Has been. Recording of pre-information by wobbling of the groove track 2 is executed in advance before the DVD-R 1 is shipped by a cutting device described later, like the pre-pit 4.
[0056]
When recording information (information such as image information to be originally recorded other than pre-information; the same applies hereinafter) is recorded on the DVD-R 1, the pre-pit 4 and the groove track 2 are recorded in the information recording apparatus described later. The pre-information is acquired in advance by detecting the wobbling frequency, and the optimum output of the light beam B as the recording light is set based on the pre-information, and the address which is the position on the DVD-R 1 where the recording information is to be recorded Information or the like is acquired, and recording information is recorded at a corresponding recording position based on the address information.
[0057]
Here, at the time of recording the recording information, the recording information is recorded by forming the recording information pit corresponding to the recording information on the groove track 2 by irradiating the center of the light beam B with the center of the groove track 2. Form. At this time, the size of the light spot SP is set so that a part of the light spot SP is irradiated not only on the groove track 2 but also on the land track 3 as shown in FIG. Then, a push-pull method (a push using a photodetector divided by a dividing line parallel to the rotation direction of the DVD-R1), which will be described later, using a part of the reflected light of the light spot SP irradiated on the land track 3 is used. The pre-information is acquired from the pre-pit 4 by the pull method (hereinafter referred to as a radial push-pull method), and the pre-information is acquired, and the groove is reflected using the reflected light of the light spot SP irradiated on the groove track 2. Pre-information is detected from the wobbling frequency of track 2 and the pre-information is acquired.
[0058]
Next, a recording format of pre-information recorded by the cutting apparatus according to the present embodiment will be described with reference to FIG. In FIG. 2, the upper row shows the recording format in the recording information, and the lower waveform waveform shows the wobbling state (plan view of the groove track 2) of the groove track 2 on which the recording information is recorded. An upward arrow between two wobbling states schematically shows a position where the prepit 4 is formed. Here, in FIG. 2, the wobbling state of the groove track 2 is shown using an amplitude larger than the actual amplitude for easy understanding, and the recording information is recorded on the center line of the groove track 2.
[0059]
As shown in FIG. 2, the record information recorded on the DVD-R 1 in this embodiment is divided in advance for each sync frame as an information unit. One recording sector is formed by 26 sync frames, and one ECC (Error Correcting Code) block is formed by 16 recording sectors. One sync frame has a length of 1488 times (1488T) a unit length (hereinafter referred to as T) corresponding to the bit interval defined by the recording format when recording the recording information. Furthermore, synchronization information SY for synchronizing each sync frame is recorded in the head portion of 14T length of one sync frame.
[0060]
On the other hand, the pre-information recorded on the DVD-R 1 in this embodiment is recorded for each sync frame. Here, when pre-information is recorded on the DVD-R 1 by the pre-pit 4, a sync signal in the pre-information is provided on the land track 3 adjacent to the area where the sync information SY in each sync frame in the record information is recorded. As shown, one pre-pit 4 is always formed, and two or one of the pre-information to be recorded is indicated on the land track 3 adjacent to the first half of the sync frame other than the sync information SY. (The pre-pit 4 may not be formed in the first half of the sync frame other than the synchronization information SY depending on the content of the pre-information to be recorded). At this time, in the present embodiment, in one recording sector, the pre-pit 4 is formed only in even-numbered sync frames (hereinafter referred to as EVEN frames) or only in odd-numbered sync frames (hereinafter referred to as ODD frames). And pre-information is recorded. That is, in FIG. 2, when the prepit 4 is formed in the EVEN frame (indicated by a solid line upward arrow in FIG. 2), the prepit 4 is not formed in the adjacent ODD frame.
[0061]
On the other hand, when pre-information is recorded by changing the wobbling frequency of the groove track 2, first, the first half of all sync frames is set to a predetermined constant wobbling frequency regardless of the content of the pre-information to be recorded. (Indicated by the symbol f ₀ in FIG. 2), the second half of each sync frame is wobbled at a frequency corresponding to the content of the pre-information to be recorded. In this case, the wobbling frequency in the latter half part of each sync frame has two frequencies (indicated by reference numeral f ₁ or f ₂ in FIG. 2), which will be described later according to the contents of the pre-information to be recorded. They are used separately as shown below. In this embodiment, “0” or “1” in the pre-information to be recorded is expressed by two adjacent sync frames (a pair of EVEN frame and ODD frame).
Next, a cutting apparatus according to this embodiment for forming the prepit 4 and the groove track 2 shown in FIG. 2 into the shape shown in FIG. 1 in the form shown in FIG. 2 will be described with reference to FIGS.
[0062]
First, the configuration of the cutting device according to the embodiment will be described with reference to FIGS. 3 to 6. The cutting apparatus shown in FIGS. 3 to 6 is for manufacturing a stamper disk for mass production of a DVD-R 1 on which pre-pits 4 and wobbling groove tracks 2 are formed and pre-information is recorded. Is.
[0063]
First, the overall configuration of the cutting apparatus will be described with reference to FIG.
As shown in FIG. 3, the cutting apparatus C according to the embodiment includes a data generator 20 that generates pre-information _SPP to be recorded, a parallel / serial converter 21 that performs parallel / serial conversion on the pre-information _SPP , a feature of the invention, based on the pre-information S _PP, certain wobbling signal generating means for generating a record pre-information S _R and wobbling signal S _W described later to form the pre-pits 4 and the groove track 2 in the format shown in FIG. 2 The preformat encoder 22 as the control wobbling signal generation means and the pit formation signal generation means, and the clock signal CLK (the period is set to T) used for preformatting to the preformat encoder 22 are output. 1 for the clock signal generator 23 and the DVD-R1 substrate. The lube truck 2 while emitting a light beam L _G to form while wobbling, the laser generator 24 for emitting a light beam L _L to form the land track 3 and the pre-pit 4 is shown in FIG. 1, is emitted An optical modulator 25 for modulating the light beam L _L or L _G based on the recording pre-information S _R , an objective lens 26 for condensing the light beams L _G and L _L on the stamper disk, and rotating the stamper disk. A spindle motor 29, a rotation detector 30 for detecting the rotation speed of the stamper disk, and servo-controlling the rotation of the stamper disk based on the detected rotation speed, and detecting one rotation per rotation of the stamper disk. Rotation servo circuit 31 for outputting signal S _S to preformat encoder 22, spiral groove track 2 and land track 3, a spindle motor 29 and a feed unit 32 that sends the stamper disk in the radial direction of the stamper disk corresponding to the rotation of the stamper disk, a position detector 33 that detects the position of the feed unit 32, and a detection a feed servo circuit 34 for servo controlling the movement of the unit feeding on the basis of the position of the feed unit 32, a light beam L _G is vibrated in the radial direction of the stamper disc on the basis of the wobbling signal S _W described later, to the wobbling The electromagnet 35 for forming the groove track 2 is fixed to the optical modulator 25, and the optical modulator 25 is actually vibrated in the radial direction of the stamper disk by the magnetic interaction with the electromagnet 35 to thereby generate the light beam L _G Permanent magnet 3 for forming groove track 2 wobbling by vibrating It is constituted by the. Here, the laser generator 24 is composed of a beam emitter 24 _G for emitting a light beam L _G, by an emitting device 24 _L for emitting a light beam L _L. Then, the light beam L _L is modulated based on the recording pre-information S _R by the optical modulator 25, the light beam L _G is not shown DC (direct current) drive and the stamper disc while always maintaining a constant intensity by The stamper disk is irradiated while vibrating in the radial direction. Furthermore, the light beam L _G to form a light beam L _L and the groove track 2 to form the land track 3 is irradiated while shifting the irradiation position in the radial direction of the stamper disc, concentric spiral land track 3 and the groove track 2 Will be formed at the same time.
[0064]
On the other hand, the stamper disk is composed of a glass substrate 27 as a stamper disk body, a prepit 4 coated on the glass substrate, and a resist (photosensitive material) 28 for forming each track.
[0065]
In the above configuration, the laser generator 24, the optical modulator 25, and the objective lens 26 constitute recording means.
Next, a detailed configuration of the preformat encoder 22 will be described with reference to FIG.
[0066]
As shown in FIG. 4, the pre-format encoder 22 uses the EVEN frame signal S _E corresponding to the EVEN frame and the ODD at the timing corresponding to each sync frame shown in FIG. 2 based on the input clock signal CLK. An ODD frame signal S _O corresponding to a frame is output, and an EVEN frame count signal S _EC output from an EVEN frame counter, which will be described later, is reset every time an EVEN frame signal S _E corresponding to one EVEN frame is generated. output, further, a frame signal generator 40 for outputting a first frame signal S _H indicating the beginning of recording sectors respectively, in a period corresponding to one round of the stamper disc on the basis of the clock signal CLK and the one rotation detection signal S _S Synch to form prepit 4 to be recorded An ODD / EVEN determination gate signal generator 41 that outputs a gate signal S _G for determining whether a frame is an EVEN frame or an ODD frame, an EVEN frame signal S _E , a gate signal S _G, and one Based on the rotation detection signal S _S , a determination unit 42 that outputs a determination signal S _J for determining whether a sync frame in which the prepit 4 is to be formed is an EVEN frame or an ODD frame, and a leading frame signal S _H, EVEN frame signal S _E, ODD frame signal S _O, based on the clock signal CLK and the pre-information S _PP, an even record pre-information S _RE and recording for forming a pre-pit 4 corresponding to the EVEN frame of the record information record pre information for outputting the odd recording pre-information S _RO for forming a pre-pit 4 corresponding to the oDD frame information A generator 44, based on the determination signal S _J, a switch 43 for outputting an even record pre-information S _RE or odd recording pre-information S _RO selectively switched, the use of the EVEN frame signal S _E as an initialization signal The counter 45 that counts the clock signal included in the clock signal CLK while being initialized, and outputs the count signal S _C every time the head of the sync frame becomes half the number of clocks, the count signal S _C and the pre-information S Based on _PP , it corresponds to the wobble signal S _W (digital signal) stored in advance for wobbling the groove track 2 corresponding to the first half of the sync frame at the predetermined constant wobbling frequency f ₀ or the second half of the sync frame. c the groove track 2 by the frequency f ₁ or f ₂ corresponding to the pre-information S _PP Is an analog signal for vibrating the optical modulator 25 prestored wobbling signal S _W ROM for outputting (digital signal) and (Read Only Memory) 46, the outputted wobbling signal S _W for causing bling It is constituted by a D / a converter 47 for converting the wobbling signal S _W. In the above configuration, the switch 43 is normally switched to the even number recording pre-information S _RE side.
[0067]
Next, detailed configurations of the frame signal generator 40 and the ODD / EVEN determination gate signal generator 41 will be described with reference to FIG.
As shown in FIG. 5, the frame signal generator 40, ODD frame based on the clock signal CLK, and measures the elapsed time from the timing for generating the ODD frame signal S _O outputs the ODD frame count signal S _OC Counter 50, EVEN frame counter 51 that counts the elapsed time from the timing at which EVEN frame signal S _E should be generated based on clock signal CLK, and outputs EVEN frame count signal S _EC , and ODD frame counter A decoder 52 that outputs a pulse having a length of 2T as an ODD frame signal S _O when it is time to output the next ODD frame signal S _O based on the ODD frame count signal S _OC output from 50; EVEN frame count output from the EVEN frame counter 51 No. Based on S _EC, when it is time to be output the next EVEN frame signal S _E, a decoder 53 for outputting a pulse length 2T as EVEN frame signal S _E, counts the EVEN frame signal S _E , A counter 54 for outputting a count signal S _CC as a recording sector boundary every time the 13th EVEN frame signal S _E is output, and a head frame signal indicating the head of the recording sector based on the count signal S _CC It is composed of a decoder 55 which outputs a S _H.
[0068]
On the other hand, as shown in FIG. 5, ODD · EVEN judging gate signal generator 41, based on the EVEN frame count signal S _EC and one rotation detection signal S _S, one single revolution detection signal S _S is input Each time (in other words, every time the stamper disc makes one rotation), a latch circuit 60 for latching the value of the EVEN frame count signal S _EC at that time, on the basis of the clock signal CLK and the one rotation detection signal S _S, A gate that counts while resetting at the same value and cycle as the EVEN frame counter 51 and updates the value to the value recorded in the latch circuit 60 each time the one rotation detection signal _SS is input. a gate counter 61 for outputting a use count signal S _GC, based on the gate count signal S _GC, the value of the gate counter 61 becomes the maximum reset And a mono multivibrator 62 which outputs a gate signal S _G of a predetermined length each time it is.
[0069]
Next, the configuration of the recording pre-information generator 44 will be described with reference to FIG.
As shown in FIG. 6A, the recording pre-information generator 44 includes an EVEN unit 44E that outputs the even recording pre-information S _RE based on the EVEN frame signal S _E and the clock signal CLK, and an ODD frame signal S. based on the _O and the clock signal CLK, and is constituted by a oDD unit 44O for outputting the odd recording pre-information S _RO.
[0070]
Among them, the EVEN unit 44E is formed in the area of each pre-pit 4 in the EVEN frame (the synchronization signal SY (see FIG. 2) in the EVEN frame in the land track 3) based on the EVEN frame signal S _E and the clock signal CLK. The timing signal S _B0 (formed in the region of the synchronization signal SY in the EVEN frame in the land track 3) indicating the timing at which the one prepit 4 to be formed and the other prepits 4 to be formed in the region other than the synchronization signal SY are to be formed. Bit timing for outputting timing signals S _B1 and S _B2 (corresponding to other pre-pits 4 to be formed in regions other than the synchronization signal SY). The timing signal is generated by the generator 65 and the configuration shown in FIG. S _B0, S _B1 and S _B2, is pre-information S _PP and the first frame signal S _H is input, eventually the OR circuit 69, the AND circuit 66 and OR circuit 67 to output the even-numbered recording pre-information S _RE It is configured.
[0071]
On the other hand, the ODD unit 44O is formed in the region of each pre-pit 4 in the ODD frame (synchronization signal SY (see FIG. 2) in the ODD frame in the land track 3) based on the ODD frame signal S _O and the clock signal CLK. The timing signal S _B0 (formed in the region of the synchronization signal SY in the ODD frame in the land track 3) indicating the timing at which the power pre-pit 4 and other pre-pits 4 to be formed in the region other than the synchronization signal SY are to be formed. Bit timing generation for outputting timing signals S _B1 and S _B2 (corresponding to other pre-pits 4 to be formed in regions other than the synchronization signal SY) a vessel 70, the timing signal S _B0 in the configuration shown in FIG. 6 (a) respectively, S _B1及S _B2, pre-information S _PP and the first frame signal S _H is inputted is composed of a final AND circuits 71 and 72 and the OR circuit 73 outputs the odd recording pre-information S _RO.
[0072]
Next, the configuration of the bit timing generator 65 or 70 in the recording pre-information generator 44 will be described with reference to FIG. The bit timing generator 65 and the bit timing generator 70 have basically the same configuration.
[0073]
As shown in FIG. 6B, the bit timing generator 65 (70) is initialized by a pulse in each frame signal based on the clock signal CLK and the EVEN frame signal S _E (or ODD frame signal S _O ). In addition, among the clocks in the clock signal CLK, the timing of the seventh clock from the pulse of each frame signal, the timing of the 193rd clock from the pulse of each frame signal, and the 379th clock from the pulse of each frame signal The timing signal S _B0 is output at the timing of the seventh clock from the pulse of each frame signal on the basis of the counter 74 that outputs the count signal S _CCC at each timing, and the count signal S _CCC. At the timing of the 193rd clock from the previous pulse Outputs timing signals S _B1, is constituted by a decoder 75 for outputting the timing signal S _B2 at the timing of the 379-th clock pulse of each frame signal.
[0074]
Next, the operation of the cutting apparatus C having the above configuration will be described with reference to timing charts shown in FIGS.
First, with reference to FIG. 7 (a), ODD frame signal S _O, EVEN frame signal S _E, the operation of the frame signal generator 40 for generating a first frame signal S _H and the EVEN frame count signal S _EC will be described.
[0075]
As shown in FIG. 7 (a), the frame signal indicating each sync frame generates pulses at intervals of 1488T in length of one sync frame, whereas in the ODD frame signal S _O , Pulses having a length of 2T are generated at intervals of twice the frame signal from the timing corresponding to the sync frame. Pulses of the ODD frame signal S _O is the ODD frame counter 50, each time a clocking a time corresponding the timing of the first sync frame in 2976T (= 1488T × 2), this time elapses, the decoder At 52, it is generated continuously by repeating the generation of a pulse of length 2T.
[0076]
On the other hand, in the EVEN frame signal S _E , pulses having a length of 2T are generated at intervals of twice the frame signal from the timing corresponding to the 0th sync frame. As in the case of the ODD frame signal S _O , the EVEN frame signal S _E measures time corresponding to 2976T from the timing of the 0th sync frame in the EVEN frame counter 51, and every time this time elapses. Further, it is continuously generated by repeating the generation of a pulse having a length of 2T in the decoder 53. At this time, EVEN frame for counting signal S _EC outputted by the EVEN frame counter 51 is output to the latch circuit 60 of the ODD · EVEN judging gate signal in generator 41.
[0077]
Further, in the first frame signal S _H, pulses corresponding to twice the length of the frame signal from the timing corresponding to the 0th sync frame (2976T) is generated. For the occurrence of the first frame signal S _H, first, the count of the EVEN frame signal S _E with the counter 54 at the timing of EVEN frame signal S _E corresponding to the 0-th sync frames and outputs a count signal S _CC It started, by generating a signal that maintains the value of "H" and becomes thereafter between 2976T "H" in the decoder 55 which receives the count signal S _CC as trigger count signal S _CC, the first frame signal S _H Is generated. Note that, in the counter 54 continues to count also EVEN frame signal S _E after outputting the count signal S _CC, at the timing of counting pulses of thirteen EVEN frame signal S _E output the next count signal S _CC To do. Thus, at all times so that the first frame signal S _H is output with a pulse from the beginning of the timing length of 2976T of recording sectors per one recording sector.
[0078]
Next, regarding the operation of the recording pre-information generator 44 using the EVEN frame signal S _E , ODD frame signal S _O, head frame signal S _H , clock signal CLK and pre-information S _PP from the frame signal generator 40, This will be described with reference to FIGS. 4, 6 and 8.
[0079]
First, the EVEN frame signal S _E , the ODD frame signal S _O , the head frame signal _SH and the clock signal CLK are input to the recording pre-information generator 44 at the timing shown in FIG. At this time, for the EVEN frame signal S _E and the ODD frame signal S _O , each pulse is always input every two sync frames.
[0080]
The bit timing generators 65 and 70 (including the counter 74 and the decoder 75) to which the EVEN frame signal S _E , the ODD frame signal S _O , the head frame signal _SH and the clock signal CLK are input include the EVEN frame. The count of the clock signal CLK is started using the pulse in the signal S _E or the ODD frame signal S _O as a trigger signal, and the seventh clock and the 193rd clock from the timing when the pulse of the EVEN frame signal S _E or the ODD frame signal S _O is input. At the 379th clock and the 379th clock, the timing signal S _B0 , the timing signal S _B1 and the timing signal S _B2 are output, respectively. At this time, the bit timing generator 65 outputs the timing signal S _B0 , the timing signal S _B1 and the timing signal S _B2 using the EVEN frame signal S _E as a trigger signal, and the bit timing generator 70 outputs the ODD frame signal S _O. The timing signal S _B0 , the timing signal S _B1 and the timing signal S _B2 are output as trigger signals.
[0081]
The timing signal S _B0 is output at the seventh clock from each frame signal because the pre-pit 4 (first pre-pit 4 in one sync frame) formed in correspondence with the timing signal S _{B0. 0} of.), formed within the synchronization information SY in the recording information is recorded (between 14T from the timing of the frame signal), which synchronization signal in the pre-information S _PP recorded by prepits 4 ( This is because the pre-pit B ₀ is formed at a position corresponding to 7T (seventh clock) from the timing of each frame signal so as to be a signal indicating the head in the sync frame).
[0082]
The reason why the timing signals S _B1 and S _B2 are output at the 193rd clock and the 379th clock from the respective frame signals is as follows. In the DVD-R1 of this embodiment, the pre-information S in the recording of the digital information _SRR is recorded. _In order to facilitate phase synchronization at the time of _PP detection, the pre-pit 4 is recorded at the position of the maximum amplitude of the wobbling as described later with respect to the recording of the pre-information S _PP by the wobbling of the groove track 2 and the recording of the pre-information S _PP by the pre-pit 4. Is going to form. At this time, the above-mentioned predetermined constant wobbling frequency irrelevant to the pre-information S _PP includes eight waves of wobbling in one sync frame so that the constant wobbling frequency can be easily detected when recording information is recorded. Frequency (140 kHz). Therefore, in order to form the second and third pre-pits 4 (hereinafter referred to as pre-pits B ₁ and B ₂ ) in one sync frame in accordance with the wobbling at the constant wobbling frequency, pre-pits B ₀ to 186T are formed. Since it is necessary to output the timing signal S _B1 and the timing signal S _B2 corresponding to the pre-pits B ₁ and B ₂ separated by (1488T ÷ 8), the interval between the timing signals S _B1 and S _B2 is also determined. 186T. For these reasons, the timing signal S _B1 is output at 193T (7 + 186) from each frame signal, and the timing signal S _B2 is output at 379T (7 + 186 × 2) from each frame signal.
[0083]
Next, the timing signal S _B0 output from the bit timing generator 65 based on the EVEN frame signal S _E is input to the OR circuit 67 as it is, and the timing signal S _B1 is input to the AND circuit 66. The leading frame signal _SH is input to the other input terminal of the AND circuit 66. On the other hand, the timing signal S _B2 is input to the AND circuit 68. The other input terminal of the AND circuit 68 receives the output signal of the OR circuit 69 to which the pre-information _SPP and the leading frame signal _SH are input. Finally, the output signal of the AND circuit 66 and the output signal of the AND circuit 68 are input to the other two input terminals of the OR circuit 67, respectively. Accordingly, even-numbered recording pre-information S _RE that is an output signal of the OR circuit 67 is based on the timing signals S _B0 , S _B1, and S _B2 during the first sync frame of one recording sector, as shown in FIG. The even-numbered recording pre-information S _RE shown in the fourth row from the bottom is output (in this embodiment, the pre-information S _PP corresponding to the first sync frame of one recording sector corresponds to “0”. The pre-information _SPP to be set is set in advance.) On the other hand, between the sync frames other than the first sync frame of one recording sector, the pre-information _SPP corresponding to “0” based on the timing signals S _B0 , S _B1 and S _B2 is shown in the lower part of FIG. The even-numbered recording pre-information S _RE shown in the second row is output, and for the pre-information _SPP corresponding to “1”, the even-numbered recording pre-information S _RE shown in the bottom row in FIG. 8 is output.
[0084]
The timing signal S _B0 output from the bit timing generator 70 based on the ODD frame signal S _O is input to the OR circuit 73 as it is, and the timing signal S _B1 is input to the AND circuit 71. The leading frame signal _SH is input to the other input terminal of the AND circuit 71. On the other hand, the timing signal S _B2 is input to the AND circuit 72. The pre-information _SPP is input to the other input terminal of the AND circuit 72. Finally, the output signal of the AND circuit 56 and the output signal of the AND circuit 72 are input to the other two input terminals of the OR circuit 73, respectively. Accordingly, the odd recording pre-information _SRO that is an output signal of the OR circuit 73 is shown in FIG. 8 based on the timing signals S _B0 , S _B1, and S _B2 during the first sync frame of one recording sector. Odd recording pre-information _SRO shown in the third row from the bottom is output. On the other hand, between the sync frames other than the first sync frame of one recording sector, the pre-information _SPP corresponding to “0” is set to the even recording pre- _code based on the timing signals S _B0 , S _B1 and S _B2. The odd-numbered recording pre-information _SRO shown in the second row from the bottom of FIG. 8 similar to the information S _RE is output, and the pre-information _SPP corresponding to “1” is the same as the even-numbered recording pre-information S _RE in FIG. Odd recording pre-information _SRO shown in the lower part is output.
[0085]
Next, the operation of the ODD / EVEN determination gate signal generator 41 will be described with reference to FIGS.
As shown in FIG. 9, in the frame signal generator 40, the count signal S _EC for EVEN frame for generating an EVEN frame signal S _E corresponding to the frame signal is generated, the latch circuit 60, one rotation the value of the detection signal S _S for counting EVEN frame at the timing that is the input signal S _EC latches (stores).
[0086]
At this time, the gate counter 61 counts while resetting at the same value and cycle as the EVEN frame counter 51 based on the clock signal CLK, but every time one rotation detection signal S _S is input, Is updated to the value stored in the current latch circuit 60, and counting from the value is repeated. That is, the gate counter 61 repeats the same operation as the EVEN frame counter 51 before one rotation in the stamper disk in one rotation immediately after the one rotation. In other words, the output value of the gate counter 61 includes the position information of the prepit 4 recorded in the EVEN frame before one rotation.
[0087]
The mono multivibrator 62 generates a pulse signal as the gate signal S _G every time the output value of the gate counter 61 is reset to the maximum value. Accordingly, the gate signal S _G also includes the position information of the prepit 4 recorded in the EVEN frame before one rotation. The pulse width of the gate signal S _G is increased by Δ (more than the length of the synchronous pre-information 14T and the rotation of the stamper disk at the length of the land track 3 corresponding to one rotation of the stamper disk. Specifically, a pulse width of (14T + Δ) is obtained by adding a length corresponding to Δ = 2 × π × (track pitch between land tracks 3).
[0088]
Next, operation | movement of the determination device 42 is demonstrated using FIG.7 (b).
As shown in FIG. 7B, when the EVEN frame signal S _E is within the range of the gate signal S _G , the determination unit 42 normally performs even-numbered recording pre-processing at the rising timing of the EVEN frame signal S _E. In order to switch the switch 43 switched to the information S _RE side to the odd recording pre-information S _RO side, a determination signal S _J as shown in FIG. The odd recording pre-information S _RO is output as recording pre-information S _R via the switch 43.
[0089]
Therefore, normally, even-numbered recording pre-information S _RE from the recording pre-information generator 44 is output via the switch 43, so that the pre-pit 4 is formed at the position of the EVEN frame based on the even-numbered recording pre-information S _RE. Thus, the pre-information S _PP is recorded, but when the EVEN frame signal S _E falls within the range of the gate signal S _{G in} the determiner 42, that is, one rotation before the rotation in the stamper disk. The position of pre-pit 4 (pre-pits B ₀ , B ₁ and B ₂ ) (the information is included in the gate signal S _G ) is close to the position of the pre-pit (position of the EVEN frame) in the rotation. with respect to the position of the pre-pit 4 when contained in the range of (14T + Δ)), the determination signal S _J is outputted to switch the switch 43 to the odd recording pre-information S _RO side Is, the pre-pit 4 in the rotation will be formed at the position of the ODD frame.
[0090]
When you have one rotation to the position of the ODD frame in a state where the pre-pit 4 is recorded is detected by one rotation detection signal S _S, in the subsequent rotation, to form a pre-pit 4 to the position of the EVEN frame again Accordingly, the determination signal S _J for switching the switch 43 to the even-numbered recording pre-information S _RE side is output from the determining device 42, and the even-numbered recording pre-information S _RE is output as the recording pre-information S _R.
[0091]
Next, the operation of the counter 45, ROM 46 and D / A converter 47 for generating the wobbling signal S _W, will be described with reference to FIGS. 4 and FIG.
First, the counter 45 uses the input EVEN frame signal S _E as an initialization signal and counts the number of clocks of the clock signal CLK while being initialized every time the EVEN frame signal S _E is input. A numerical value is output as the count signal S _C.
[0092]
The count signal S _C and the pre-information S _PP are input as address data in the ROM 46, whereby the ROM 46 is preset in accordance with the contents of the count signal S _C and the pre-information S _PP and is stored in the ROM 47. The output value stored in the form of a table is output as a wobbling signal S _W (digital value).
[0093]
Here, in the present embodiment, the constant wobbling frequency f ₀ is 140 kHz (frequency at which wobbling for 8 waves is included in one sync frame), and the frequencies f ₁ and f ₂ are 105 kHz (140 kHz × (3/4), that is, the frequency at which wobbling for 3 waves enters a half area of one sync frame) and 175 kHz (140 kHz × (5/4), that is, 5 waves for a half area of one sync frame. The frequency at which wobbling enters is set in advance. The reason why the respective wobbling frequencies are set in this way is to reliably detect all the wobbling frequencies of the groove track 2 wobbled at the respective wobbling frequencies as described above when recording information is recorded. This is also for smooth connection between regions of different wobbling frequencies in each sync frame, that is, for shifting while maintaining the continuity of the shape of the groove track 2 when shifting to a region of different wobbling frequencies. The relationship between the wobbling frequency of the groove track 2 and the presence or absence of each of the prepits 4 (prepits B ₀ , B ₁ and B ₂ ) in one EVEN frame and the subsequent ODD frame is as follows. Is set as shown in Table 1 below in correspondence with the content of the pre-information to be recorded in the one EVEN frame and the subsequent ODD frame.
[0094]
[Table 1]

In this table, “presence” in the column of presence / absence of prepits indicates that the corresponding prepit 4 is formed, and “none” indicates that the corresponding prepit 4 is not formed. The combination of “No” corresponds to the waveform of the even-numbered recording pre-information S _RE or the odd-numbered recording pre-information S _RO shown in the fourth to the bottom of FIG. That is, in the first sync frame of the recording sector, if it is an EVEN frame, all the prepits 4 (prepits B ₀ , B ₀₎ corresponding to the even recording pre-information S _RE shown in the fourth row from the bottom of FIG. ₁ and B ₂ ) and the _first sync frame of the recording sector is an ODD frame, only pre-pits B ₀ and B ₁ corresponding to the odd-numbered recording pre-information S _RO shown in the third row from the bottom in FIG. In the sync frame other than the head of the recording sector, when the pre-information _SPP to be recorded in the sync frame is “1”, the even-numbered record pre-information S _RE (or the odd-numbered record pre-records shown in the bottom of FIG. 8) only information S _RO) in response to the pre-pits B ₀ and B ₂ are formed, up to be recorded in the sync frame other than the head of the recording sector When information S _PP is "0", only the pre-pit B ₀ corresponds to the even-numbered recording pre-information shown in the second stage from the bottom Figure 8 S _RE (or odd recording pre-information S _RO) is formed.
[0095]
Regarding the wobbling frequency of the groove track 2, in the first sync frame of the recording sector, if it is an EVEN frame, the wobbling frequency of the first half of the EVEN frame is f ₀ (140 kHz), and the wobbling frequency of the second half is It is assumed that f ₂ (175 kHz), the first half wobbling frequency of the ODD frame next to the EVEN frame is f ₀ (140 kHz), and the second half wobbling frequency is f ₁ (105 kHz). Further, when the first sync frame of the recording sector is an ODD frame, the wobbling frequency of the first half of the ODD frame is f ₀ , the wobbling frequency of the second half is f ₁ , and the first half of the next EVEN frame of the ODD frame is wobbling. The frequency is f ₀ and the latter wobbling frequency is f ₂ . Further, in the sync frame other than the head of the recording sector, when the pre-information _SPP to be recorded in the sync frame is “1”, the first sync frame (EVEN frame or ODD frame) is included in the sync frame. the first half of the wobbling frequency f _0, the second half of the wobbling frequency f ₂ of), the wobbling frequency of the first half of the second sync frame f _0, the second half of the wobbling frequency are f _1. Furthermore, in the sync frame other than the head of the recording sector, when the pre-information _SPP to be recorded in the sync frame is “0”, the first sync frame (EVEN frame or ODD frame) is included in the sync frame. 1), the first half wobbling frequency is f ₀ , the second half wobbling frequency is f ₁ , the first half wobbling frequency of the second sync frame is f ₀ , and the second half wobbling frequency is f ₂ . By combining the wobbling frequencies in this way, a signal for controlling the rotation of the spindle motor is detected by detecting the wobbling frequency f ₀ portion of each sync frame as movement control information in the information recording apparatus described later. Rutotomoni, in its pre-information S _PP (the present embodiment by a combination, one pre-information S _PP in two sync frame is recorded by further detecting a portion of the wobbling frequency f ₁ or f ₂ as control information Is detected).
[0096]
Then, the wobbling frequency of the groove track 2 is stored in the table ROM47 for outputting the wobbling signal S _W so as to obtain the combination shown in Table 1, based on the count signal S _C and pre-information S _PP outputs the contents of the table as wobbling signal S _W. As the form of storage of the specific ROM 47, for example, the MSB (Most Significant Bit) in the address data pre-information S _PP, the count signal S _C to the non-MSB in the address data digit (2SB, 3SB ...... LSB ), Data “f ₀ ” − “f ₁ ” − “f ₀ ” − “f ₂ ” for the two sync frames are stored in the addresses “0000” to “0FFF” in the ROM 47, address "1000", "f _0" for the two sync frames in "1FFF" from - "f _2" - "f _0" - stores the data of "f _1", the pre-information S _PP input it may be read any of these as a wobbling signal S _W based on the counter signal S _C.
More specifically, for example, when the pre-information _SPP is “0”, the counter 45 corresponds to each value when the count value of the counter 45 is “0”, “744”, “1488”, and “2232”. The count signal S _C is output. This is because the count value is between “0” (the head of the EVEN frame) and “744” (the half position of the EVEN frame) and “1488” (the head of the ODD frame) to “2232” (the half of the ODD frame). 2), the wobbling frequency of the groove track 2 is set to a constant wobbling frequency f ₀ as shown in FIG. 2, and the wobbling frequency of the groove track 2 between the count values “744” and “1488” is shown in FIG. 2 and the frequency f ₁ as shown in, than it data is stored to the frequency f ₂ showing the wobbling frequency of the groove track 2 in FIG. 2, for example between up to further count value is then initialized from the "2232" .
[0097]
When the pre-information S _PP is “1”, the wobbling frequency when the count value of the counter 45 is between “744” and “1488” is set to f ₂ , and the count value is initialized next from “2232”. The data having the wobbling frequency f ₁ until this time is stored.
[0098]
Thereafter, the wobbling signal S _W is converted into an analog signal by a D / A converter 47, by the operation of the electromagnet 35 and the permanent magnet 36 based on the wobbling signal S _W which has been converted into the analog signal, the optical modulator 25 By moving (vibrating) in the radial direction of the stamper disk, a groove track 2 wobbling at a desired frequency is formed, and a pre-pit 4 is formed at the head of the sync frame. At the same time, the prepit 4 is formed at the position of the maximum amplitude in the wobbling frequency f ₀ portion.
[0099]
When the characteristic features of the operation of the cutting device C of the present embodiment described above are summarized, the operations of the gate signal generator 41 and the determiner 42 for determining the ODD / EVEN in the cutting device C of the present embodiment are described. Thus, when the position of the prepit 4 in the stamper disc before one rotation (usually recorded at the EVEN frame position) is close to the position of the prepit 4 in the next rotation, more specifically, the prepit 4 before one rotation. When the determination unit 42 determines that the EVEN frame signal S _E in the next rotation falls within the range of the gate signal S _{G including} the position information of the pre-pit 4 in the next rotation, recording pre-information S _R to be recorded at the position of S _O is generated, the light beam by the optical modulator 25 based on this _L is modulated land track 3 comprising pre-pits 4 are formed on the DVD-R1. At this time, the groove track 2 so as to parallel to the land track 3 by the light beam L _L simultaneously the outputted light beam L _G is formed. Further, by the movement of the optical modulator 25 based on the wobbling signal S _W, is irradiated while wobbling the light beam L _G is, the groove track 2 is formed of a wobbling frequency corresponding to pre-information S _PP each pre-pit 4 and to be recorded The
[0100]
As described above, according to the cutting apparatus C of the present embodiment, the predetermined constant wobbling in which the wobbling frequencies at the same position (first half) are set in advance for the groove tracks 2 corresponding to all the sync frames. Since the frequency f ₀ is used, when recording information is recorded, if the constant wobbling frequency f ₀ is detected and the rotation of the DVD-R 1 is controlled based on the detected frequency, it can be accurately detected in the period of each sync frame. The rotation is controlled based on the constant wobbling frequency f ₀ , and the rotation of the DVD-R 1 can be accurately controlled in recording the recording information.
[0101]
Further, as the groove track 2 in one sync frame, in addition to the groove track 2 having the constant wobbling frequency f ₀ , the groove track 2 having the wobbling frequency f ₁ or f ₂ corresponding to the pre-information _SPP to be recorded is formed. since, at the time of recording the record information, it becomes possible to the pre-information S _PP wobbling frequency corresponding to is detected accurately in a cycle of each sync frame, the recording of the record information while performing rotation control of the DVD-R1 accurately Necessary address information and the like can be acquired.
[0102]
Further, for the groove track 2 in one sync frame, the region wobbled at the constant wobbling frequency f ₀ is the first half of the groove track 2 in the one sync frame. it can be simplified, and further, it is possible to reliably detect both wobbling frequency f ₁ or f ₂ corresponding to the constant wobbling frequency f ₀ and the pre-information S _PP at the time of recording the record information.
[0103]
Furthermore, in addition to the wobbling of the groove track 2, so pre-information S _PP is recorded by the pre-pit 4, any of the recorded pre-information S _PP by pre-information S _PP or pre-pits 4 which is recorded by wobbling Even when one of them is not detected, the rotation of the DVD-R 1 can be reliably controlled.
[0104]
Furthermore, according to the cutting device C of the embodiment, when the position of the prepit 4 recorded at the EVEN frame position before one rotation in the DVD-R1 is close to the position of the prepit 4 in the next rotation, the next rotation is performed. In this case, the pre-pit 4 is formed at the position of the ODD frame, and after further one rotation, the pre-pit 4 is formed at the original EVEN frame position, so that the position of the pre-pit 4 overlaps in the adjacent land track 3. it is no, in the detection of pre-information S _PP in the recording of the record information to be described later, when reading the pre-information S _PP on one land track 3, the pre-information S _PP adjacent land track 3 that is Komu leak Therefore, the accurate pre-information _SPP can be read.
[0105]
At this time, since the gate signal S _G has a pulse width of a length (14T + Δ) including an increase Δ of the length corresponding to one round of the land track 3 per rotation in the stamper disk, the stamper The position of the prepit 4 on the adjacent land track 3 does not approach due to the change of the radial position on the disc. Therefore, in any part on the stamper disk, the position of the prepit 4 on the adjacent land track 3 can be set to a position not on the same straight line in the radial direction.
[0106]
In addition, the length of the section in which the wobbling frequency is f ₀ in one sync frame is not limited to the ½ sync frame described above, and corresponds to at least three prepits 4 ( If the wobbling frequency in the section where the pre-pits B _{0 to} B ₂ ) are formed is f _0, it may have any length within one sync frame.
(II) Embodiment of information recording apparatus Next, an embodiment of the information recording apparatus according to the present invention will be described with reference to Figs. In the following description, an embodiment in which the present invention is applied to an information recording apparatus for recording digital information transmitted from a host computer onto the DVD-R1 will be described.
[0107]
First, the overall configuration and operation of the information recording apparatus according to the present embodiment will be described with reference to FIG. In the following embodiment, in the DVD-R1, the prepit 4 including the address information on the DVD-R1 and the wobbled groove track 2 are formed in advance, and the prepit is recorded when digital information is recorded. 4 and the wobbling frequency of the groove track 2 are detected in advance to obtain address information on the DVD-R1, thereby detecting and recording the recording position on the DVD-R1 where the digital information is recorded.
[0108]
As shown in FIG. 10, the information recording apparatus S of the embodiment includes a pickup means, a pickup 76 as a recording means, a reproduction amplifier 77, a decoder 78, a pre-pit signal decoder 79, and a spindle motor 80 as a driving means. Servo circuit 81 as drive signal generation means, processor 82, encoder 83, power control circuit 84, laser drive circuit 85, interface 86, filter 88, waveform shaper 89, and extraction means And a control signal extractor 90. In addition, digital information S _RR to be recorded from an external host computer 87 is input to the information recording apparatus S via an interface 86.
[0109]
Next, the overall operation will be described.
The pickup 76 includes a laser diode (not shown), a deflecting beam splitter, an objective lens, a photodetector, and the like. The pickup 76 irradiates the information recording surface of the DVD-R1 with the light beam B based on the laser drive signal _SDL and applies the reflected light to the information light. Based on the radial push-pull method, the wobbling frequency of the pre-pit 4 and the groove track 2 is detected to record the digital information S _RR to be recorded, and when there is already recorded digital information, the light beam B The already recorded digital information is detected based on the reflected light.
[0110]
Then, the reproduction amplifier 77 amplifies the detection signal _SDT including information corresponding to the wobbling frequency of the prepit 4 and the groove track 2 output from the pickup 76, and preinformation corresponding to the wobbling frequency of the prepit 4 and the groove track 2. The signal S _PPP is output, and the amplified signal S _P corresponding to the already recorded digital information is output.
[0111]
Then, the decoder 78 decodes the amplified signal S _P by performing 8-16 demodulation and deinterleaving on the amplified signal S _P, and outputs a demodulated signal S _DM and a servo demodulated signal S _SD.
[0112]
On the other hand, pre-information signal decoder 79 decodes only the signal obtained by detecting the pre-pits 4 included in the pre-information signal S _PPP outputs a demodulated pre-pit signal S _PD.
[0113]
Then, the servo circuit 81, based on the demodulated pre-pit signal S _PD and the servo demodulated signal S _SD, and outputs a pickup servo signal S _SP for the focus servo control and tracking servo control in the pickup 76. Further, the servo circuit 81 servo-controls the rotation of the spindle motor 80 and outputs a spindle servo control signal S _SS based on the spindle servo signal S _SPS described later.
[0114]
Along with these, the processor 82 is already outputs a reproduction signal S _OT corresponding to the digital information recorded in the external, mainly controls the entire information recording apparatus S on the basis of the demodulated signal S _DM.
[0115]
On the other hand, under the control of the processor 82, the interface 86 performs an interface operation for taking the digital information S _RR transmitted from the host computer 87 into the information recording device S, and the digital information S _RR is obtained. Output to the encoder 83.
[0116]
The encoder 83, ECC generator (not shown), 8-16 modulation unit includes a scrambler or the like, on the basis of the digital information S _RR, as well as constituting an ECC block which is a unit for performing error correction during reproduction, the ECC The block is subjected to interleaving, 8-16 modulation, and scramble processing to generate a modulated signal _SREE .
[0117]
Thereafter, the power control circuit 84 outputs a recording signal _SD for controlling the output of a laser diode (not shown) in the pickup 76 based on the modulation signal _SREE .
[0118]
Further, the laser drive circuit 85 outputs the laser drive signal _SDL for actually driving the laser diode and emitting the light beam B based on the recording signal _SD .
[0119]
On the other hand, the filter 88 extracts only the wobbling frequency of the groove track 2 included in the pre-information signal S _PPP , and outputs an extraction signal S _P1 corresponding to each wobbling frequency (the frequencies f ₀ , f ₁ and f ₂ ). To do.
[0120]
Then, the extracted signal S _P1 is output to the waveform shaper 89, and a shaped signal S _P2 having each wobbling frequency is output even if noise or the like included in the extracted signal S _P1 is removed.
[0121]
Finally, the control signal extractor 90 outputs the spindle servo signal S _SPS based on the shaping signal S _P2, and uses address information included as a combination of wobbling frequencies in the shaping signal S _P2 as an address signal S _DTT. Output to the processor 82.
[0122]
The above information recording apparatus S is also possible to reproduce the information recorded on the DVD-R1, At this time, the reproduction signal S _OT through the processor 82 on the basis of the demodulated signal S _DM It will be output to the outside.
[0123]
Next, detailed configurations of the filter 88, the waveform shaper 89, and the control signal extractor 90 according to the present invention will be described with reference to FIG.
As shown in FIG. 11, the filter 88 extracts the wobbling frequency from the A / D converter 91 that converts the pre-information signal S _PPP , which is an analog signal, into a digital signal, and the digitized pre-information signal S _PPP. And a band-pass filter 92 that passes only the pre-information signal S _PPP having a frequency of 105 kHz to 175 kHz.
[0124]
The waveform shaper 89 includes a switch 94, a delay circuit 95, a window comparator 96, and a prediction calculator 93.
The control signal extractor 90 includes a comparator 97, an edge extractor 98, a counter 99, a hold device 100, a window comparator / comparator 101, and a data determination circuit 102.
[0125]
Next, the operations of the filter 88, the waveform shaper 89, and the control signal extractor 90 will be described with reference to FIGS.
The pre-information signal S _PPP output from the regenerative amplifier 77 is input to the filter 88 and converted into a digital signal, and then only the frequency component corresponding to the wobbling frequency of the groove track 2 is extracted and output as the extracted signal S _P1. The
[0126]
The extracted signal S _P1 is output to a switch 94 (usually switched to the extracted signal S _P1 side) in the waveform shaper 89, and is also output to the delay circuit 95 and the window comparator 96. Then, the extracted signal S _P1 is delayed for a predetermined time by the delay circuit 95, the amplitude of the delayed signal and the amplitude of the current extracted signal S _P1 are compared by the window comparator 96, and the delayed signal and the current A difference in amplitude from the extracted signal S _P1 is detected, and when the difference is larger than a predetermined value set in advance, the switch 94 is switched from the extracted signal S _P1 side to the output signal side of a predictive calculator 93 described later. As shown in the uppermost part of FIG. 12, this operation is indicated by the extracted signal S _P1 in the form of impulse noise caused by the prepit 4 on the land track 3 adjacent to the groove track 2 (indicated by the solid line arrow in the uppermost part of FIG. 12). .) are included, in order to remove it, the signal delayed and the current extraction signal S _P1 compared in the window comparator 96, and when the difference is the predetermined value or greater than the extraction of current _Assuming that the signal S _P1 includes the impulse noise, the current extraction signal S _P1 is not output as the shaping signal S _P2 from the switch 94, but instead, the output signal of the prediction calculator 93 is shaped. This is because the signal S _P2 is output.
[0127]
Here, the predictive calculator 93 predicts and outputs the amplitude value of the current extracted signal S _P1 from the average value of the amplitude of the extracted signal S _P1 one or several samples before, for example,
(Amplitude value in the previous sample) + (Average change) = (Amplitude value of the current extracted signal S _P1 )
The calculated current amplitude value is output to the switch 94.
[0128]
The extracted signal S _P1 from which the impulse noise has been removed in this way is output to the control signal extractor 90 as the shaped signal S _P2 .
Then, the comparator 97 in the control signal extractor 90 binarizes the shaping signal S _P2 and outputs a comparison signal S _P3 having three types of pulse lengths corresponding to changes in the frequency (wobbling frequency). Thus, the edge extractor 98 extracts the edge of the comparison signal S _P3, and outputs the edge signal S _P4 having three types of intervals corresponding to original wobbling frequency as shown in FIG. 12. The edge signal S _P4 is output to the counter 99, the hold device 100, the window comparator / comparator 101, and the data determination circuit 102.
[0129]
Counter 99 the edge signal S _P4 is input, counts the clock signal CLK, which is input separately the edge signal S _P4 as a trigger signal, counts the count value at that time every time the edge signal S _P4 is input Output as signal _SP5 . The count signal S _P5 includes three types of values (indicated by “K”, “L”, and “M” in FIG. 12) corresponding to the original wobbling frequency. Thereafter, the hold device 100 to which the count signal S _P5 is input holds each value of the count signal S _P5 based on the edge signal S _P4 , and corresponds to the three types of values included in the count signal S _P5 . A hold signal S _P6 having a ternary level is output. The window comparator / comparator 101 to which the hold signal S _P6 is input, based on the edge signal S _P4, the hold signal S _P6 inputted, corresponding to the original wobbling frequency f ₀ in the count signal S _P5 A spindle servo signal S _SPS having two levels corresponding to the level and other values in the count signal S _P5 is generated and output to the servo circuit 81. Since the spindle servo signal S _SPS is a signal having a period of exactly one sync frame regardless of the value of the pre-information S _PP , the spindle servo signal S _SPS having the waveform is output to the servo circuit 81, By comparing this with a preset reference signal, it is possible to accurately detect the deviation of the current DVD-R1 from the reference value.
[0130]
On the other hand, in parallel with this, the window comparator / comparator 101 generates an address signal (105 kHz corresponding to “0” or “1”) recorded from the three types of levels in the input hold signal S _{P6 at} the original wobbling frequency. Or a signal indicating a frequency of 175 kHz) S _P7 is output to the data determination circuit 102.
[0131]
Then, the data determination circuit 102 is responsive to address signals S _P7 and demodulated pre-pit signal S _PD, are you currently detected by the demodulated pre-pit signal S _PD has been recognized that an EVEN frame, and the address signal S when wobbling frequency which is currently detected by _P7 is 175kHz outputs the address signal S _DTT indicating this as pre-information S _PP is "1" which is detected currently processor 82. On the other hand, been recognized that are you currently detected by the demodulating pre-pit signal S _PD is EVEN frame and the pre being detected current when wobbling frequency which is currently detected by the address signal S _P7 is 105kHz An address signal S _DTT indicating that the information _SPP is “0” is output to the processor 82.
[0132]
The data determination circuit 102 is recognized that that are currently detecting an ODD frame by demodulating the pre-pit signal S _PD, and, when a wobbling frequency which is currently detected by the address signal S _P7 is 175kHz is Assuming that the currently detected pre-information _SPP is “0”, an address signal S _DTT indicating this is output to the processor 82. On the other hand, been recognized that are you currently detected by the demodulating pre-pit signal S _PD is ODD frame, and the pre being detected current when wobbling frequency which is currently detected by the address signal S _P7 is 105kHz The address signal S _DTT indicating that the information _SPP is “1” is output to the processor 82.
[0133]
Then, the processor 82 the address signal S _DTT is input, that on the basis with the address signal S _DTT in the demodulated pre-pit signal S _PD, to obtain the address information on the DVD-R1 to be recorded the current digital information S _RR It becomes.
[0134]
Note that the address signal S _DTT and the demodulated pre-pit signal S _PD contain the same address information. Normally, the address information is acquired based on the demodulated pre-pit signal S _PD. Address information S _DTT is used as a spare, and address information is acquired based on address signal S _DTT only when demodulated pre-pit signal _SPD is not detected due to noise or the like.
[0135]
As described above, according to the information recording apparatus S of the present embodiment, regardless of the value of the pre-information S _PP, currently based on the spindle servo signal S _SPS is exactly signal having a period of one sync frame Since the deviation of the rotational speed of the DVD-R1 from the reference value is accurately detected and the spindle motor control signal _SSS is generated to control the rotation of the spindle motor 80, the accuracy corresponding to the actual rotational speed of the DVD-R1 Rotation control is possible.
[0136]
Further, since the pre-information _SPP is also recorded by wobbling the groove track 2 on the DVD-R1, it is possible to acquire address information necessary for recording information while accurately controlling the rotation of the DVD-R1. .
[0137]
Furthermore, the first half of one sync frame is a constant wobbling frequency f0, the latter part because there is a wobbling frequency which corresponds to the pre-information S _PP, it is possible to record the record information is reliably detect both.
[0138]
Furthermore, since the pre-information S _PP is recorded by prepits 4 to DVD-R1, the pre-information for the recorded rotation control by pre-information S _PP or pre-pits 4 for the rotation control recorded by wobbling even if one of the S _PP is not detected, it is possible to reliably record information by controlling the rotation of the DVD-R1.
[0139]
In each of the above embodiments, the case where the present invention is applied to the DVD-R1 has been described. However, the present invention is not limited to this, and a recording medium that detects information for movement control by wobbling a track (for example, tape-like recording) The present invention can be widely applied to recording information for each predetermined information unit on a medium or the like.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of the configuration of a DVD-R according to an embodiment.
FIG. 2 is a diagram illustrating an example of a recording format in the DVD-R according to the embodiment.
FIG. 3 is a block diagram illustrating a schematic configuration of the cutting apparatus according to the embodiment.
FIG. 4 is a block diagram illustrating a schematic configuration of a preformat encoder according to the embodiment.
FIG. 5 is a block diagram illustrating a schematic configuration of a frame signal generator and an ODD / EVEN determination gate signal generator according to the embodiment;
6 is a block diagram showing a schematic configuration of a recording pre-information generator and a bit timing generator according to the embodiment, FIG. 6A is a block diagram showing a schematic configuration of a recording pre-information generator, and FIG. It is a block diagram which shows schematic structure of a bit timing generator.
FIG. 7 is a timing chart showing the operation of the preformat encoder, (a) is a timing chart showing the EVEN frame signal and ODD frame signal, and (b) is a timing chart showing the operation of the determiner.
FIG. 8 is a timing chart showing the operation of the recording pre-information generator.
FIG. 9 is a timing chart showing operations of the frame signal generator and the ODD / EVEN determination gate signal generator.
FIG. 10 is a block diagram showing a schematic configuration of an information recording apparatus.
FIG. 11 is a block diagram showing detailed configurations of a filter, a waveform shaper, and a control signal extractor.
FIG. 12 is a timing chart showing operations of a filter, a waveform shaper, and a control signal extractor.
[Explanation of symbols]
1 ... DVD-R
2 ... groove track 3 ... land track 4 ... pre-pit 5 ... dye film 6 ... gold vapor deposition film 7 ... protective layer 20 ... data generator 21 ... parallel / serial converter 22 ... pre-format encoder 23 ... clock signal generator 24, 24G, 24L ... Laser generator 25 ... Optical modulator 26 ... Object lens 27 ... Glass substrate 28 ... Registration 29, 80 ... Spindle motor 30 ... Rotation detector 31 ... Rotation servo circuit 32 ... Feed unit 33 ... Position detector 34 ... Feed servo circuit 40 ... Frame signal generator 41 ... ODD / EVEN determination gate signal generator 42 ... Determinator 43 ... Switch 44 ... Recording pre-information generator 44E ... EVEN unit 44O ... ODD units 45, 54, 74, 99 ... Counter 46 ... ROM
47 ... D / A converter 50 ... ODD frame counter 51 ... EVEN frame counters 52, 53, 55, 75, 78 ... Decoder 60 ... Latch circuit 61 ... Gate counter 62 ... Mono multivibrator 65, 70 ... Bit timing Generators 66, 68, 71, 72 ... AND circuits 67, 69, 73 ... OR circuit 76 ... Pickup 77 ... Reproduction amplifier 79 ... Pre-pit signal decoder 81 ... Servo circuit 82 ... Processor 83 ... Encoder 84 ... Power control circuit 85 ... Laser Drive circuit 86 ... Interface 87 ... Host computer 88 ... Filter 89 ... Waveform shaper 90 ... Control signal extractor 91 ... A / D converter 92 ... Band pass filter 93 ... Prediction calculator 94 ... Switch 95 ... Delay circuit 96 ... Window Comparator 97 ... Comparator 98 ... Tsu di extractor 100 ... hold 101 ... window comparator / comparator 102 ... data judging unit C ... cutting apparatus CLK ... clock signal S ... information recording apparatus LL, LG, B ... light beam SP ... light spot S _PP ... pre-information S _R ... Recording pre-information S _S ... Single rotation detection signal S _E ... EVEN frame signal S _EC ... EVEN frame count signal S _O ... ODD frame signal S _OC ... ODD frame count signal S _J ... Judgment signals S _C , S _CC , S _CCC, S _P5 ... count signal S _W ... wobbling signal S _G ... gate signal S _H ... first frame signal S _RE ... even-recording pre-information S _RO ... odd recording pre-information S _GC ... gate count signal S _B0, S _B1, S _B2 ... Timing signal S _RR ... Digital information S _REE ... Modulation signal S _D ... Recording signal S _DT ... Detection signal S _DL ... Laser drive signal S _OT ... Playback signal S _P ... Amplified signal S _PPP ... Pre-pit signal S _DM ... Demodulated signal S _SD ... Servo demodulated signal S _PD ... Demodulated pre-pit signal S _SP ... Pick-up servo signal S _SPS ... Spindle servo signal S _SS ... Spindle servo control signal S _DTT , S _P7 … Address signal S _P1 … Extraction signal S _P2 … Shaping signal S _P3 … Comparison signal S _P4 … Edge signal S _P6 … Hold signal

Claims (6)

Movement control information for controlling the movement speed of the recording medium when recording the recording information to be recorded on the recording medium is recorded on the recording medium by wobbling a track formed on the recording medium. A movement control information recording device for
A part of the information unit in the track is the track the corresponding information unit is formed in the region to be recorded in the period and a information unit for controlling the moving velocity of the recording information, a preset constant Specific wobbling signal generating means for generating a specific wobbling signal for wobbling at a frequency;
Recording means for recording the movement control information by wobbling a part of the track in the information unit at the constant frequency based on the generated specific wobbling signal;
With
The specific wobbling signal generating means generates the specific wobbling signal so that the wobbling frequency at the same position is the constant frequency for all the tracks in the information unit on the recording medium. A characteristic movement control information recording apparatus. In the movement control information recording device according to claim 1,
The specific wobbling signal generation means is configured to specify that the length of the information unit track wobbled at the constant frequency is half the length of the one information unit track in one information unit track. A movement control information recording apparatus for generating a wobbling signal. In the movement control information recording device according to claim 1 or 2,
The recording medium is a disc-shaped recording medium,
The movement control information recording apparatus, wherein the movement control information is rotation control information for controlling the number of rotations of the disc-shaped recording medium when the recording information is recorded. An information recording medium in which a track composed of a plurality of wobbling and preset units is formed in advance,
The unit corresponds to a cycle for controlling the moving speed of the information recording medium when recording information is recorded on the information recording medium.
The Ri same der is mutually shape of the wobbling of mutually the same region of each unit,
The information recording medium is characterized in that each of the areas is wobbled at a preset constant wobbling frequency . The information recording medium according to claim 4 ,
Information recording medium, wherein the pre-Symbol region is the first half part of the region of each of the units. An information recording medium in which a track composed of a plurality of preset units that are wobbled is formed, and the unit determines the moving speed of the information recording medium when information is recorded on the information recording medium. The wobbling shapes of the same region in each unit are the same as each other, and each region is wobbled at a preset constant wobbling frequency. An information reproducing apparatus for reproducing information recorded on an information recording medium,
Pickup means for irradiating the track with a light beam and outputting a detection signal based on reflected light from the track of the light beam;
Extraction means for extracting control information from the detection signal;
An information reproducing apparatus comprising:

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