JP2004086999A - Recording condition setting method, program and recording medium, and optical disk device - Google Patents

Abstract

An object of the present invention is to provide a recording condition setting method capable of setting optimum recording conditions for high-speed recording.
A test writing is performed in a test writing area at a predetermined linear velocity (steps 401 to 405, steps 409 to 413), and an average value of light emission power at a predetermined linear velocity is calculated based on the processing result. (Steps 417, 419). Then, an average value of the light emission power at an arbitrary linear velocity is calculated based on the calculated average value of the light emission power (step 421), and an optimum recording power at an arbitrary linear velocity is determined based on the calculation result. A recording condition at an arbitrary linear velocity is set based on the recording power (step 423) (step 425). Since the average value of the light emission power includes the information on the recording strategy, even when the recording linear velocity and the linear velocity in the test writing are different, the optimum recording power can be accurately obtained.
[Selection] Fig. 6

Description

【００８２】
そして、次の（３）式から線速度Ｖｉでの平均パワーＰａｖｉを算出する。ここで、Ｐｂは再生パワーである。
【００８３】
Ｐａｖｉ＝Ｐｗｉ×Ｔｗｉ＋Ｐｂ×（１−Ｔｗｉ）　……（３）
【００８４】
次のステップ４１９では、外周ＯＰＣの結果に基づいて、線速度Ｖｏでの平均パワーを算出する。ここでは、先ず、次の（４）式から線速度Ｖｏでの記録パルス幅比率Ｔｗｏを求める。
【００８５】
Ｔｗｏ＝０．５＋ｄＴｏ　……（４）
【００８６】
ここで、ｄＴｏは線速度Ｖｏでの書き込み信号におけるハイレベルの増加量であり、次の（５）式から算出される。
【００８７】
【数２】

【００８８】
そして、次の（６）式から線速度Ｖｏでの平均パワーＰａｖｏを算出する。
【００８９】
Ｐａｖｏ＝Ｐｗｏ×Ｔｗｏ＋Ｐｂ×（１−Ｔｗｏ）　……（６）
【００９０】
次のステップ４２１では、記録線速度Ｖｒにおける平均パワー（ここではＰａｖｒとする）を次の（７）式に基づいて算出する（図８（Ａ）参照）。
【００９１】
Ｐａｖｒ＝（Ｐａｖｏ−Ｐａｖｉ）／（Ｖｏ−Ｖｉ）×Ｖｒ＋（Ｐａｖｉ×Ｖｏ−Ｐａｖｏ×Ｖｉ）／（Ｖｏ−Ｖｉ）　……（７）
【００９２】
次のステップ４２３では、先ず、次の（８）式に基づいて、記録線速度Ｖｒにおけるパルス幅補正値θｖｒを求める（図８（Ｂ）参照）。
【００９３】
θｖｒ＝（θｖｏ−θｖｉ）／（Ｖｏ−Ｖｉ）×Ｖｒ＋（θｖｉ×Ｖｏ−θｖｏ×Ｖｉ）／（Ｖｏ−Ｖｉ）　……（８）
【００９４】
次に、次の（９）式に基づいて、パルス幅補正値θｖｒから記録線速度Ｖｒにおける記録パルス幅比率Ｔｗｒを求める。
【００９５】
【数３】

【００９６】
そして、次の（１０）式に基づいて、記録線速度Ｖｒにおける最適な記録パワーＰｗｒを算出する。
【００９７】
Ｐｗｒ＝（Ｐａｖｒ−Ｐｂ×（１−Ｔｗｒ））／Ｔｗｒ　……（１０）
【００９８】
次のステップ４２５では、記録パワーＰｗｒをパワー設定回路２４ｃに出力するとともに、パルス幅補正値θｖｒをパルス設定回路２４ｂに出力する。これによって、光ディスク１５に線速度Ｖｒで情報を記録する際の記録条件が設定される。
【００９９】
次のステップ４２７では、算出された最適な記録パワーＰｗｒが所定の値未満であるか否かを判断する。ここで最適な記録パワーＰｗｒが所定の値未満であれば、ステップ４２５での判断は肯定され、記録条件を設定する処理を終了する。
【０１００】
一方、ステップ４２７において、最適な記録パワーＰｗｒが所定の値以上であれば、ステップ４２７での判断は否定され、ステップ４２９に移行する。
【０１０１】
このステップ４２９では、以降の記録方式をＣＬＶ方式に設定する。すなわち、以降の記録は線速度Ｖｒで行われることとなる。そして、記録条件を設定する処理を終了する。
【０１０２】
なお、ステップ４０７において、内周ＯＰＣが正常に終了しなければ、ステップ４０７での判断は否定され、ステップ４３５に移行する。
【０１０３】
このステップ４３５では、内周ＯＰＣの線速度Ｖｉを１段階減速し、新たな内周ＯＰＣの線速度Ｖｉとする。そして、前述したステップ４０３に戻る。なお、試し書きを行うパーティションは前回試し書きを行ったパーティションの近傍に設定される。
【０１０４】
また、ステップ４１５において、外周ＯＰＣが正常に終了しなければ、ステップ４１５での判断は否定され、ステップ４３７に移行する。
【０１０５】
ステップ４３７では、外周ＯＰＣの線速度Ｖｏを１段階減速し、新たな外周ＯＰＣの線速度Ｖｏとする。そして、前述したステップ４１１に戻る。なお、試し書きを行うパーティションは前回試し書きを行ったパーティションの近傍に設定される。
【０１０６】
上記の如くして、記録条件を設定する処理が終了すると、ホスト４９からの記録データを指定された記録領域に記録するための記録処理に移行する。ここで、記録処理について簡単に説明する。
【０１０７】
ＣＰＵ４０は、記録速度に基づいてスピンドルモータ２２の回転を制御するための制御信号をモータドライバ２７に出力する。また、ＣＰＵ４０は、ホスト４９から受信した記録データをバッファマネージャ３７を介してバッファＲＡＭ３４に蓄積する。
【０１０８】
そして、ＣＰＵ４０は、再生信号処理回路２８からのＡＴＩＰ情報に基づいて、指定された書き込み開始地点に光ピックアップ装置２３が位置するように光ピックアップ装置２３のシークモータを制御する信号をモータドライバ２７に出力する。
【０１０９】
ＣＰＵ４０は、バッファマネージャ３７からバッファＲＡＭ３４に蓄積されたデータ量が所定量を超えたとの通知を受けると、エンコーダ２５に書き込み信号の生成を指示する。これにより、ホスト４９からの記録データに対応する書き込み信号が生成される。
【０１１０】
そして、ＣＰＵ４０はＡＴＩＰ情報に基づいて光ピックアップ装置２３の位置が書き込み開始地点であると判断すると、エンコーダ２５に書き込み開始を指示する。これにより、エンコーダ２５、レーザコントロール回路２４及び光ピックアップ装置２３を介して、ホスト４９からの記録データは、前述の如くして設定された最適な記録条件に基づいて、指定された記録領域に記録されることとなる。
【０１１１】
次に、ホスト４９からの再生要求コマンドを受信した際の、光ディスク装置２０の処理動作について簡単に説明する。
【０１１２】
ＣＰＵ４０はホスト４９から再生要求のコマンドを受信すると、再生速度に基づいてスピンドルモータ２２の回転を制御するための制御信号をモータドライバ２７に出力する。ＣＰＵ４０は、再生信号処理回路２８からのＡＴＩＰ情報に基づいて、指定された読み込み開始地点に光ピックアップ装置２３が位置するようにシークモータを制御する信号をモータドライバ２７に出力する。
【０１１３】
ＣＰＵ４０はＡＴＩＰ情報に基づいて、光ピックアップ装置２３の位置が読み込み開始地点であると判断すると、再生信号処理回路２８に通知する。これにより、再生信号処理回路２８は、受光器５９の出力信号に基づいてＲＦ信号を検出し、誤り訂正処理等を行った後、バッファＲＡＭ３４に蓄積する。バッファマネージャ３７は、バッファＲＡＭ３４に蓄積された再生データがセクタデータとして揃ったときに、インターフェース３８を介してホスト４９に転送する。
【０１１４】
以上の説明から明らかなように、本第１の実施形態では、ＣＰＵ４０及び該ＣＰＵ４０によって実行されるプログラムとによって、試し書き手段、第１の平均値算出手段、第２の平均値算出手段、記録条件設定手段、及び記録手段が実現されている。すなわち、図６のステップ４０１〜４０５及びステップ４０９〜４１３の処理によって試し書き手段が、ステップ４１７及び４１９の処理によって第１の平均値算出手段が、ステップ４２１の処理によって第２の平均値算出手段が、ステップ４２３及び４２５の処理によって記録条件設定手段が、それぞれ実現されている。しかしながら、本発明がこれに限定されるものではないことは勿論である。すなわち、上記第１の実施形態は一例に過ぎず、上記のＣＰＵ４０によるプログラムに従う処理によって実現した構成各部の少なくとも一部をハードウェアによって構成することとしても良いし、あるいは全ての構成部分をハードウェアによって構成することとしても良い。
【０１１５】
また、本第１の実施形態では、ＲＯＭ３９にインストールされているプログラムのうち、図６のフローチャートで示される処理に対応するプログラムによって前記第１の記録条件設定プログラムが構成されている。
【０１１６】
そして、図６のステップ４０１〜４０５及びステップ４０９〜４１３の処理によって請求項１に記載の発明に係る記録条件設定方法の第１工程が実施され、ステップ４１７及び４１９の処理によって第２工程が実施され、ステップ４２１の処理によって第３工程が実施され、ステップ４２３及び４２５の処理によって第４工程が実施されている。
【０１１７】
以上説明したように、本第１の実施形態に係る光ディスク装置及び記録条件設定方法によると、線速度Ｖｉで内周ＯＰＣが行われ、線速度Ｖｏ（＞Ｖｉ）で外周ＯＰＣが行われる。次に、内周ＯＰＣの結果に基づいて線速度Ｖｉにおける平均パワーが算出され、外周ＯＰＣの結果に基づいて線速度Ｖｏにおける平均パワーが算出される。そして、線速度Ｖｉにおける平均パワーと線速度Ｖｏにおける平均パワーとに基づいて、記録線速度Ｖｒにおける平均パワーが算出される。続いて、その算出結果に基づいて記録線速度Ｖｒでの最適な記録パワーが求められ、さらにその記録パワーに基づいて記録線速度Ｖｒでの記録条件が決定される。すなわち、平均パワーには記録ストラテジに関する情報が含まれているため、記録線速度と試し書きでの線速度とが異なる場合であっても、記録線速度での最適な記録パワーを精度良く求めることができる。従って、結果として情報記録媒体への高速度での記録に最適な記録条件を設定することが可能となる。
【０１１８】
また、本第１の実施形態によると、内周ＯＰＣでの線速度Ｖｉと外周ＯＰＣでの線速度Ｖｏとは、互いに異なっているために、任意の線速度での最適な記録パワーを精度良く求めることができる。
【０１１９】
また、本第１の実施形態によると、内周ＯＰＣでの線速度Ｖｉよりも外周ＯＰＣでの線速度Ｖｏのほうが大きくなるように設定されているために、線速度と記録条件との関係を精度良く求めることができる。
【０１２０】
また、本第１の実施形態によると、外周ＯＰＣでの線速度Ｖｏが記録線速度Ｖｒ以上となるように設定されているために、記録線速度Ｖｒでの最適な記録パワーを精度良く求めることができる。
【０１２１】
また、本第１の実施形態によると、内周ＯＰＣが正常に終了しなかった場合には、線速度を１段階減速して再度内周ＯＰＣを行っている。これにより、内周ＯＰＣによって得られた情報の信頼性を向上させることができ、その結果として記録線速度Ｖｒでの最適な記録パワーを精度良く求めることができる。
【０１２２】
また、本第１の実施形態によると、外周ＯＰＣが正常に終了しなかった場合には、線速度を１段階減速して再度外周ＯＰＣを行っている。これにより、外周ＯＰＣによって得られた情報の信頼性を向上させることができ、その結果として記録線速度Ｖｒでの最適な記録パワーを精度良く求めることができる。
【０１２３】
また、本第１の実施形態によると、算出された記録線速度Ｖｒでの最適な記録パワーＰｗｒが所定の値以上となる場合には、それ以降の記録をＣＬＶ方式に設定している。これにより、記録感度の低い光ディスクに対しても良好な品質の記録を安定して行うことができる。また、最大出力の低い半導体レーザが用いられても良好な品質の記録を安定して行うことができる。さらに、例えば所定の値を半導体レーザの定格パワーの最大値近傍の値とすることにより、記録パワーが定格パワーの最大値以上となることを防止できるため、半導体レーザの劣化を抑制することが可能となる。
【０１２４】
また、本第１の実施形態に係る光ディスク装置によると、光ディスクへの高速度での記録に最適な記録条件を設定することができるため、その結果として記録品質に優れた記録を高速度で安定して行うことが可能となる。
【０１２５】
なお、上記第１の実施形態では、内周ＯＰＣが正常に終了しなかった場合に、内周ＯＰＣでの線速度を１段階減速して再度内周ＯＰＣを実行する場合について説明したが、これに限らず、例えば内周ＯＰＣで得られた最適な記録パワーが所定の値以上の場合に、内周ＯＰＣでの線速度を１段階減速して再度内周ＯＰＣを実行しても良い。また、内周ＯＰＣが正常に終了しても、内周ＯＰＣで得られた最適な記録パワーが所定の値以上の場合には、内周ＯＰＣでの線速度を１段階減速して再度内周ＯＰＣを実行しても良い。なお、減速は必ずしも１段階でなくても良い。例えば内周ＯＰＣで得られた最適な記録パワーと所定の値との差に応じて減速量を変更しても良い。
【０１２６】
また、上記第１の実施形態では、外周ＯＰＣが正常に終了しなかった場合に、外周ＯＰＣでの線速度を１段階減速して再度外周ＯＰＣを実行する場合について説明したが、これに限らず、例えば外周ＯＰＣで得られた最適な記録パワーが所定の値以上の場合に、外周ＯＰＣでの線速度を１段階減速して再度外周ＯＰＣを実行しても良い。また、外周ＯＰＣが正常に終了しても、外周ＯＰＣで得られた最適な記録パワーが所定の値以上の場合には、外周ＯＰＣでの線速度を１段階減速して再度外周ＯＰＣを実行しても良い。なお、減速は必ずしも１段階でなくても良い。例えば外周ＯＰＣで得られた最適な記録パワーと所定の値との差に応じて減速量を変更しても良い。
【０１２７】
また、上記第１の実施形態において、例えば内周ＯＰＣが正常に終了することが確実な場合には、内周ＯＰＣが正常に終了したか否かの判断（図６のステップ４０７）を省略しても良い。すなわち、ステップ４０７での処理をスキップし、ステップ４０５から直ちにステップ４０９に移行しても良い。これにより、記録条件を設定する処理に要する時間を短縮することができる。
【０１２８】
同様に、上記第１の実施形態において、外周ＯＰＣが正常に終了することが確実な場合には、外周ＯＰＣが正常に終了したか否かの判断（図６のステップ４１５）を省略しても良い。すなわち、ステップ４１５での処理をスキップし、ステップ４１３から直ちにステップ４１７に移行しても良い。これにより、記録条件を設定する処理に要する時間を短縮することができる。
【０１２９】
また、上記第１の実施形態では、２ヶ所でのＯＰＣの結果に基づいて、記録線速度での最適な記録パワーを求める場合について説明したが、本発明がこれに限定されるものではない。例えば内周ＯＰＣの結果のみに基づいて、記録線速度での最適な記録パワーを求めても良い。この場合には、平均パワーＰａｖｒは上記（７）式の代わりに次の（１１）式に基づいて算出される。また、パルス幅補正値θｖｒは上記（８）式の代わりに次の（１２）式に基づいて算出される。ここで、ｋは過去の経験、実験及び理論計算などから決定される定数である。
【０１３０】
Ｐａｖｒ＝（Ｖｒ／Ｖｉ）×Ｐａｖｉ　……（１１）
【０１３１】
θｖｒ＝（Ｖｒ−Ｖｉ）×ｋ＋θｖｉ　……（１２）
【０１３２】
そこで、内周ＯＰＣの結果のみに基づいて、記録線速度Ｖｒでの最適な記録パワーを求める場合について、図９のフローチャートを用いて以下に説明する。図９のフローチャートは、ＣＰＵ４０によって実行される一連の処理アルゴリズムに対応している。
【０１３３】
図９のステップ５０１から５０５では、前述したステップ４０１〜４０５と同じ処理を行う。
【０１３４】
次のステップ５０７では、前述したステップ４０７と同様にして内周ＯＰＣが正常終了したか否かを判断し、正常終了していれば、ステップ５０７での判断は肯定され、ステップ５０９に移行する。
【０１３５】
このステップ５０９では、前述したステップ４１７と同様にして内周ＯＰＣの結果に基づいて、線速度Ｖｉでの平均パワーを算出する。
【０１３６】
次のステップ５１１では、上記（１１）式に基づいて、記録線速度Ｖｒでの平均パワーＰａｖｒを算出する。
【０１３７】
次のステップ５１３では、先ず上記（１２）式に基づいて、記録線速度Ｖｒでのパルス幅補正値θｖｒを求める。そして、前述したステップ４２３と同様にして記録線速度Ｖｒでの最適な記録パワーを算出する。
【０１３８】
なお、ステップ５１５、５１７、５１９及び５２１では、それぞれ前述したステップ４２５、４２７、４２９、４３５と同じ処理を行う。
【０１３９】
これにより、記録条件を設定する処理に要する時間を短縮することができる。さらに、試し書き領域を節約することができる。そこで、例えば記録するデータ量に応じて外周ＯＰＣを行うか否かを判断しても良い。あるいは、内周ＯＰＣでの線速度と記録線速度との差が所定の値よりも小さい場合に外周ＯＰＣを省略しても良い。
【０１４０】
また、例えば外周ＯＰＣで有効な結果を得ることができなかったときに、上記（１１）式及び（１２）式を用いて、内周ＯＰＣの結果にみに基づいて記録線速度での最適な記録パワーを求めても良い。
【０１４１】
また、上記第１の実施形態では、算出された記録線速度での最適な記録パワーが所定の値未満か否かを判断（図６のステップ４２７）し、所定の値未満でないときは、記録方式をＣＬＶ方式に設定する（図６のステップ４２９）場合について説明したが、例えば算出される最適な記録パワーが所定の値未満であることが確実な場合には、図６のステップ４２７及び４２９の処理を省略しても良い。
【０１４２】
また、上記第１の実施形態では、外周ＯＰＣの線速度Ｖｏを記録線速度Ｖｒ以上となるように設定する場合について説明したが、これに限定されるものではない。
【０１４３】
また、上記第１の実施形態では、記録速度に応じて外周ＯＰＣの線速度が設定される場合について説明したが、これに限らず、例えばホスト４９から指定された線速度で外周ＯＰＣを行っても良い。これにより、例えばユーザは、情報記録媒体の種類毎に、安定した外周ＯＰＣが可能な線速度を選択することが可能となり、最適な記録条件を設定するのに要する時間を短縮することができる。
【０１４４】
また、上記第１の実施形態では、前記第１の記録条件決定プログラムは、ＲＯＭ３９に記録されているが、他の記録媒体（ＣＤ−ＲＯＭ、光磁気ディスク、フラッシュメモリ、フレキシブルディスク等）に記録されていても良い。この場合には、各記録媒体に対応するドライブ装置を付加し、各ドライブ装置から第１の記録条件設定プログラムをインストールすることとなる。要するに、第１の記録条件設定プログラムがＣＰＵ４０のメインメモリにロードされれば良い。
【０１４５】
《第２の実施形態》
以下、本発明の第２の実施形態を図１０に基づいて説明する。
【０１４６】
この第２の実施形態は、最適な記録条件を設定する処理が上記第１の実施形態と異なる点に特徴を有する。なお、その他、光ピックアップ装置、光ディスク装置の構成などは、前述した第１の実施形態と同様である。従って、以下においては、第１の実施形態との相違点を中心に説明するとともに、前述した第１の実施形態と同一若しくは同等の構成部分については同一の符号を用いるとともに、その説明を簡略化し若しくは省略するものとする。また、前提条件は上記第１の実施形態と同様であるものとする。
【０１４７】
そこで、ＲＯＭ３９には、上記第１の記録条件設定プログラムの代わりに、第２の記録条件設定プログラムが格納されている。
【０１４８】
ここで、最適な記録条件を設定する処理について図１０を用いて説明する。図１０のフローチャートは、ＣＰＵ４０によって実行される一連の処理アルゴリズムに対応している。例えばホスト４９から記録要求コマンドを受信すると、図１０のフローチャートに対応するプログラムの先頭アドレスがＣＰＵ４０のプログラムカウンタにセットされ、最適な記録条件を設定する処理がスタートする。
【０１４９】
最初のステップ６０１では、内周ＰＣＡ領域内で試し書き（第１の試し書き）を行う際の線速度（第１の線速度）として、所定の線速度Ｖｉを設定する。また、その線速度Ｖｉに対応した半導体レーザの発光パワーの基準値Ｐｓｉも設定する。
【０１５０】
次のステップ６０３では、内周ＰＣＡ領域内の所定のパーティション（第１の試し書き領域）を利用して、線速度Ｖｉでの内周ＯＰＣを実行する。すなわち、半導体レーザの発光パワーを上記基準値Ｐｓｉに対して所定のステップで変動させつつ、前記パーティションの各フレームに所定のテストデータを記録する。ここでは、一例として発光パワーの変動幅を基準値の±２５％とする。
【０１５１】
次のステップ６０５では、従来と同様に、例えば試し書きされたデータを再生し、その再生信号における上下対称性や振幅に基づいて、線速度Ｖｉにおける最適な記録パワーを求める。なお、本実施形態では、内周ＯＰＣの結果から最適な記録パワーＰｗｉが得られたものとする。
【０１５２】
次のステップ６０７では、外周ＰＣＡ領域内で試し書き（第２の試し書き）を行う際の線速度（第２の線速度）として、本実施形態では記録線速度と同じ線速度Ｖｒ（＞Ｖｉ）を設定する。
【０１５３】
次のステップ６０９では、内周ＯＰＣの結果に基づいて、線速度Ｖｒにおける半導体レーザの発光パワーの基準値（以下「基準パワー」ともいう）を設定する。ここでは、次の（１３）式を用いて基準パワーＰｏｐを求める。同時に、次の（１４）式を用いてパルス幅補正値θｖｒを算出する。ここで、ｋ’は過去の経験、実験及び理論計算などにより決定される定数である。
【０１５４】
Ｐｏｐ＝（Ｖｒ／Ｖｉ）×Ｐｗｉ　……（１３）
【０１５５】
θｖｒ＝（Ｖｒ−Ｖｉ）×ｋ’＋θｖｉ　……（１４）
【０１５６】
なお、上記（１３）式及び（１４）式は一例であり、これらに限定されるものではなく、例えば、種々の実験結果に統計処理を施して得られた多項式を用いても良い。
【０１５７】
次のステップ６１１では、リトライカウンタｍに１をセットし初期化する。
【０１５８】
次のステップ６１３では、外周ＰＣＡ領域内の所定のパーティション（第２の試し書き領域）を利用して、線速度Ｖｒでの外周ＯＰＣ（第２の試し書き）を実行する。すなわち、半導体レーザの発光パワーを基準パワーＰｏｐに対して所定のステップで変動させつつ、前記パーティションの各フレームに所定のテストデータを記録する。ここでは、一例として発光パワーの変動幅を基準パワーの±５％とする。すなわち、外周ＯＰＣでの発光パワーの変動ステップは内周ＯＰＣでの発光パワーの変動ステップよりも小さく設定されることとなる。
【０１５９】
次のステップ６１５では、上記内周ＯＰＣの場合と同様にして、線速度Ｖｒにおける最適な記録パワーを求める。なお、本実施形態では、外周ＯＰＣの結果から、最適な記録パワーＰｗｒが得られたものとする。
【０１６０】
次のステップ６１７では、得られた最適な記録パワーＰｗｒと基準パワーＰｏｐとの差が所定の値以下であるか否かを判断する。ここで、最適な記録パワーＰｗｏと基準パワーＰｏｐとの差が所定の値以下でなければ、ステップ６１７での判断は否定されステップ６１９に移行する。
【０１６１】
このステップ６１９では、リトライカウンタｍをインクリメント（＋１）する。
【０１６２】
次のステップ６２１では、リトライカウンタｍが予め設定されている所定回数以下であるか否かを判断する。ここで、リトライカウンタｍが所定回数以下であれば、ステップ６２１での判断は肯定されステップ６２３に移行する。
【０１６３】
このステップ６２３では、外周ＯＰＣの線速度Ｖｒを１段階減速し、新たな外周ＯＰＣの線速度Ｖｒとする。そして、前述したステップ６１３に戻る。なお、試し書きを行うパーティションは前回試し書きを行ったパーティションの近傍に設定される。
【０１６４】
なお、ステップ６２１において、リトライカウンタｍが所定回数以下でなければ、ステップ６２１での判断は否定されステップ６０３に戻る。すなわち、内周ＯＰＣでの結果に異常があるとして、再度内周ＯＰＣを行う。
【０１６５】
また、ステップ６１７において、最適な記録パワーＰｗｒと基準パワーＰｏｐとの差が所定の値以下であれば、ステップ６１７での判断は肯定されステップ６３１に移行する。
【０１６６】
このステップ６３１では、最適な記録パワーＰｗｒをパワー設定回路２４ｃに出力するとともに、パルス幅補正値θｖｒをパルス設定回路２４ｂに出力する。これによって、光ディスク１５に線速度Ｖｒで情報を記録する際の記録条件が設定される。
【０１６７】
以上の説明から明らかなように、本第２の実施形態では、ＣＰＵ４０及び該ＣＰＵ４０によって実行されるプログラムとによって、第１の試し書き手段、基準値取得手段、第２の試し書き手段、記録条件設定手段、及び記録手段が実現されている。すなわち、図１０のステップ６０１〜６０５の処理によって第１の試し書き手段が、ステップ６０７及び６０９の処理によって基準値取得手段が、ステップ６１３の処理によって第２の試し書き手段が、ステップ６１５及び６３１の処理によって記録条件設定手段が、それぞれ実現されている。しかしながら、本発明がこれに限定されるものではないことは勿論である。すなわち、上記第２の実施形態は一例に過ぎず、上記のＣＰＵ４０によるプログラムに従う処理によって実現した構成各部の少なくとも一部をハードウェアによって構成することとしても良いし、あるいは全ての構成部分をハードウェアによって構成することとしても良い。
【０１６８】
また、本第２の実施形態では、ＲＯＭ３９にインストールされているプログラムのうち、図１０のフローチャートで示される処理に対応するプログラムによって前記第２の記録条件設定プログラムが構成されている。
【０１６９】
そして、図１０のステップ６０１〜６０５の処理によって請求項７に記載の発明に係る記録条件設定方法の第１工程が実施され、ステップ６０７及び６０９の処理によって第２工程が実施され、ステップ６１３の処理によって第３工程が実施され、ステップ６１５及び６３１の処理によって第４工程が実施されている。
【０１７０】
以上説明したように、本第２の実施形態に係る光ディスク装置及び記録条件設定方法によると、線速度Ｖｉで内周ＯＰＣが行われ、その内周ＯＰＣの結果に基づいて、線速度Ｖｒ（＞Ｖｉ）での外周ＯＰＣにおける基準パワーＰｏｐが求められる。次に、基準パワーＰｏｐに基づいて線速度Ｖｒでの外周ＯＰＣが行われる。そして、外周ＯＰＣの結果に基づいて、線速度Ｖｒでの最適な記録パワーが求められ、その記録パワーに基づいて記録条件が決定される。すなわち、線速度Ｖｉでの試し書きの結果に基づいて線速度Ｖｒでの基準パワーＰｏｐを求めているために、その基準パワーＰｏｐと線速度Ｖｒでの最適な記録パワーとは、非常に近い値となる。従って、外周ＯＰＣの結果から求められる線速度Ｖｒでの最適な記録パワーの精度が向上し、その結果として高速度での記録に最適な記録条件を設定することが可能となる。
【０１７１】
また、本第２の実施形態によると、外周ＯＰＣで得られた最適な記録パワーＰｗｏと外周ＯＰＣでの基準パワーＰｏｐとの差が所定の値以上の場合に、リトライカウンタｍの値が所定の値以下であれば、同じ条件で再度外周ＯＰＣを実行している。これにより、例えば突発的なノイズの影響を除去することができる。
【０１７２】
また、本第２の実施形態によると、外周ＯＰＣで得られた最適な記録パワーＰｗｏと外周ＯＰＣでの基準パワーＰｏｐとの差が所定の値以上の場合に、リトライカウンタｍの値が所定の値を超えると、外周ＯＰＣでの線速度を１段階減速して再度外周ＯＰＣを実行している。これにより、外周ＯＰＣによって得られる情報の信頼性を向上させることができ、その結果として記録条件を精度良く求めることが可能となる。
【０１７３】
また、本第２の実施形態によると、外周ＯＰＣでの半導体レーザの発光パワーの変動範囲は、内周ＯＰＣでの半導体レーザの発光パワーの変動範囲よりも小さく設定されている。これにより、外周ＯＰＣでの発光パワーの変動量を小さくすることができるため、線速度Ｖｒでの最適な記録パワーを精度良く求めることが可能となる。すなわち、測定精度を向上させることができる。
【０１７４】
また、本第２の実施形態に係る光ディスク装置によると、光ディスクへの高速度での記録に最適な記録条件を設定することができるため、その結果として記録品質に優れた記録を高速度で安定して行うことが可能となる。
【０１７５】
なお、上記第２の実施形態では、前記第２の記録条件設定プログラムは、ＲＯＭ３９に記録されているが、他の記録媒体（ＣＤ−ＲＯＭ、光磁気ディスク、フラッシュメモリ、フレキシブルディスク等）に記録されていても良い。この場合には、各記録媒体に対応するドライブ装置を付加し、各ドライブ装置から第２の記録条件設定プログラムをインストールすることとなる。要するに、第２の記録条件設定プログラムがＣＰＵ４０のメインメモリにロードされれば良い。
【０１７６】
なお、上記第２の実施形態では、外周ＯＰＣでの線速度と記録線速度とが一致する場合について説明したが、本発明がこれに限定されるものではない。そして、この場合には、内周ＯＰＣの結果と外周ＯＰＣの結果に基づいて、記録線速度での最適な記録条件が設定されることとなる。
【０１７７】
また、上記第２の実施形態では、外周ＯＰＣでの半導体レーザの発光パワーの変動範囲が、内周ＯＰＣでの半導体レーザの発光パワーの変動範囲よりも小さい場合について説明したが、これに限らず、例えば同じであっても良い。
【０１７８】
また、上記第２の実施形態では、外周ＯＰＣで使用されるフレーム数と内周ＯＰＣで使用されるフレーム数とが互いに等しい場合について説明したが、これに限らず、例えば外周ＯＰＣで使用されるフレーム数を内周ＯＰＣで使用されるフレーム数よりも少なくしても良い。これにより、記録条件を設定する処理に要する時間を短縮することができるとともに、試し書き領域を有効に利用することが可能となる。
【０１７９】
また、上記第２の実施形態において、外周ＯＰＣの線速度が所定の線速度以上の場合には、外周ＯＰＣ領域における２フレーム毎に半導体レーザの発光パワーを変化させても良い。これにより、外周ＯＰＣでは更に精度良く最適な記録パワーを求めることができる。
【０１８０】
また、上記第２の実施形態では、外周ＯＰＣによって得られた最適な記録パワーとそのときの基準パワーとの差が所定の値以下のときに、記録条件を設定する場合について説明したが、これに限らず、例えば外周ＯＰＣが正常に終了したときに記録条件を設定しても良い。この場合について図１１のフローチャートを用いて以下に説明する。図１１のフローチャートは、ＣＰＵ４０によって実行される一連の処理アルゴリズムに対応している。例えばホスト４９から記録要求コマンドを受信すると、図１１のフローチャートに対応するプログラムの先頭アドレスがＣＰＵ４０のプログラムカウンタにセットされ、処理がスタートする。
【０１８１】
最初のステップ７０１では、光ディスク１５におけるリードイン開始時間をＡＴＩＰ情報から抽出する。
【０１８２】
次のステップ７０３では、予めＲＯＭ３９に格納されているリードイン開始時間とベンダコードとの対応テーブルを参照し、光ディスク１５のベンダコードを取得する。
【０１８３】
次のステップ７０５〜７１３では、前述したステップ６０１〜６０９と同様な処理を行う。
【０１８４】
次のステップ７１５及び７１７では、前述したステップ６１３及び６１５と同様な処理を行う。
【０１８５】
次のステップ７１９では、外周ＯＰＣが正常に終了したか否かを判断する。外周ＯＰＣが正常に終了したか否かは、再生信号の上下対称性や振幅などによって判断される。また、最適な記録パワーが得られたか否かによって判断しても良い。ここで、外周ＯＰＣが正常に終了していれば、ステップ７１９での判断は肯定され、ステップ７２１に移行する。
【０１８６】
このステップ７２１では、最適な記録パワーＰｗｒをパワー設定回路２４ｃに出力するとともに、パルス幅補正値θｖｒをパルス設定回路２４ｂに出力する。これによって、光ディスク１５に線速度Ｖｒで情報を記録する際の記録条件が設定される。そして、記録条件を設定する処理を終了する。
【０１８７】
一方、ステップ７１９において、外周ＯＰＣが正常に終了していなければ、ステップ７１９での判断は否定され、ステップ７２３に移行する
【０１８８】
このステップ７２３では、基準パワーＰｏｐをパワー設定回路２４ｃに出力するとともに、パルス幅補正値θｖｒをパルス設定回路２４ｂに出力する。これによって、光ディスク１５に線速度Ｖｒで情報を記録する際の記録条件が設定される。そして、記録条件を設定する処理を終了する。
【０１８９】
以上の説明から明らかなように、この場合では、ＣＰＵ４０及び該ＣＰＵ４０によって実行されるプログラムとによって識別情報取得手段が実現されている。
【０１９０】
なお、基準パワーＰｏｐをパワー設定回路２４ｃに出力した場合には、記録終了後に、記録されたデータ（以下、便宜上「直前記録データ」という）の記録品質を監視することが望ましい。なお、このときには、図１２に示されるように、再生信号処理回路２８の代わりに、ＲＦ信号のピークレベルを検出するためのピークレベル検出回路２８ｉと、ＲＦ信号のボトムレベルを検出するためのボトムレベル検出回路２８ｊとが付加された再生信号処理回路２８’が用いられることとなる。この記録品質監視処理について図１３のフローチャートを用いて以下に説明する。図１３のフローチャートは、ＣＰＵ４０によって実行される一連の処理アルゴリズムに対応している。例えば記録が終了すると、図１３のフローチャートに対応するプログラムの先頭アドレスがＣＰＵ４０のプログラムカウンタにセットされ、記録品質監視処理がスタートする。
【０１９１】
最初のステップ８０１では、光ディスク１５が所定の再生速度で回転するようにモータドライバ２７に指示するとともに、直前記録データが記録された領域の先頭に光ピックアップ装置２３が位置するようにシークモータを制御する制御信号をモータドライバ２７に出力する。
【０１９２】
次のステップ８０３では、再生信号処理回路２８に記録品質のチェックを指示する。これにより、光ディスク１５の線速度が安定すると、再生信号処理回路２８では、ＲＦ信号検出回路２８ｄにて光ピックアップ装置２３からの出力信号に基づいてＲＦ信号を検出し、ピークレベル検出回路２８ｅ及びボトムレベル検出回路２８ｆにてＲＦ信号のピークレベル（Ｌｐ１とする）及びボトムレベル（Ｌｂ１とする）をそれぞれ取得する。そして、そのピークレベルＬｐ１とボトムレベルＬｂ１は再生信号処理回路２８からＣＰＵ４０に出力される。
【０１９３】
次のステップ８０５では、ピークレベルＬｐ１とボトムレベルＬｂ１とをＡ／Ｄ変換し、次の（１５）式に基づいて、再生信号の品質の指標となるいわゆるβ値を算出する。なお、（１５）式におけるｄＬｐ１及びｄＬｂ１は、それぞれピークレベルＬｐ１及びボトムレベルＬｂ１をＡ／Ｄ変換した値である。
【０１９４】
β＝（ｄＬｐ１＋ｄＬｂ１）／（ｄＬｐ１−ｄＬｂ１）　……（１５）
【０１９５】
次のステップ８０７では、算出したβ値が所定の基準を満たすか否かを判断する。ここで、算出したβ値が所定の基準を満たさなければ、ステップ８０７での判断は否定され、ステップ８０９に移行する。
【０１９６】
このステップ８０９では、光ディスク１５に対して、直前記録データが記録されたときの記録速度（以下、便宜上「直前記録速度」という）での記録を以後、禁止するために、光ディスク１５のベンダコードと直前記録速度とを含む記録禁止情報を不図示の不揮発メモリに記録する。
【０１９７】
次のステップ８１１では、直前記録速度では良好な記録は不可能であることを示すエラー情報及び記録可能な最大記録速度情報をホスト４９に通知する。そして、記録品質監視処理を終了する。これにより、ユーザは、その速度では所定の記録品質を得ることができないことを認識でき、以降は記録速度を遅くして記録を要求することができる。従って、光ディスクを有効に利用することが可能となる。また、ユーザはそのベンダの光ディスクにおける最大記録速度を知ることができるため、以降の記録処理が順調に行われることとなる。
【０１９８】
一方、ステップ８０７において、算出したβ値が所定の基準を満たせば、ステップ８０７での判断は肯定され、記録品質監視処理を終了する。
【０１９９】
ここでは、再生信号から算出されたβ値を用いて、再生信号の品質を判断しているために、精度良く記録品質を判断することができる。また、記録品質を判断するための新たな装置などを必要としないため、高コスト化を防止することが可能となる。
【０２００】
なお、再生信号の品質の指標としては、β値に限定されるものではなく、例えば、ＣＤデコーダ２８ｆでのＣ１復号時のエラー（Ｃ１エラー）及びＣ２復号時のエラー（Ｃ２エラー）の数を求め、そのエラーの数を再生信号の品質の指標としても良い。また、そのエラーの数と再生したセクタ数とから算出されるエラーの発生率（エラーレート）を再生信号の品質の指標としても良い。勿論、Ｃ１エラー及びＣ２エラーの数が多ければ、再生信号の品質が悪いと判断される。すなわち、再生データそのものから記録品質を判断しているため、精度良く記録品質を判断することができる。また、この場合でも記録品質を判断するための新たな装置などを必要としないため、高コスト化を防止することが可能となる。
【０２０１】
以上の説明から明らかなように、この場合には、ＣＰＵ４０及び該ＣＰＵ４０によって実行されるプログラムとによって、品質取得手段、判別手段、記録禁止手段、及び出力手段が実現されている。
【０２０２】
また、記録禁止情報を不図示の不揮発メモリに格納することにより、ホスト４９から書き込み要求コマンドを受信したときに、指定された記録速度での記録が可能であるか否かを判断することができる。この場合の処理（以下、便宜上「記録可否判断処理」という）について図１４のフローチャートを用いて以下に説明する。なお、光ディスク１５のベンダコードはすでに前述の如くして取得されているものとする。図１４のフローチャートは、ＣＰＵ４０によって実行される一連の処理アルゴリズムに対応している。例えばホスト４９から書き込み要求コマンドを受信したときに、記録条件の設定処理に先だって、図１４のフローチャートに対応するプログラムの先頭アドレスがＣＰＵ４０のプログラムカウンタにセットされ、記録可否判断処理がスタートする。
【０２０３】
最初のステップ９０１では、ホスト４９から指定された記録速度を抽出する。なお、記録速度は通常では、書き込み要求コマンドに先だってホスト４９から送信される。
【０２０４】
次のステップ９０３では、不図示の不揮発メモリに格納されている記録禁止情報を参照して、光ディスク１５に対して指定された記録速度での記録が可能であるか否かを判断する。すなわち、光ディスク１５のベンダコードをキーとして記録禁止情報を検索し、光ディスク１５における記録が禁止されている記録速度（禁止記録速度）を抽出する。そして、抽出された禁止記録速度と指定された記録速度とを比較して指定された記録速度での記録が可能であるか否かを判断する。ここで、記録が不可能であれば、ステップ９０３での判断は否定され、ステップ９０５に移行する。
【０２０５】
このステップ９０５では、指定された記録速度での記録を禁止する。そして、指定された記録速度での記録が不可能であることを示すエラーコードを設定し、記録可能な最大記録速度とともにホスト４９に通知する。
【０２０６】
次のステップ９０７では、記録可能な最大記録速度を記録速度に設定し、記録可否判断処理を終了する。なお、この場合には、ホスト４９からの指示待ちとなる。
【０２０７】
一方、ステップ９０５において、指定された記録速度での記録が可能であれば、記録可否判断処理を終了し、記録処理に移行する。
【０２０８】
このように、ベンダコードと禁止記録速度とを含む記録禁止情報が不揮発メモリ（不図示）に記録されていることにより、記録要求コマンドを受信した際に記録禁止情報を参照し、即座に記録可能であるか否かを判断することができる。すなわち、過去の経験から記録品質が悪いと予想される記録速度での記録を禁止することにより、光ディスクを無駄にすることを防止できる。
【０２０９】
また、上記各実施形態では、リードアウト領域の外周側に試し書き領域を設定し、その領域を利用して外周ＯＰＣを行う場合について説明したが、これに限らず、例えば内周ＰＣＡ領域内の外周側、すなわち、リードイン領域に近い領域を利用して外周ＯＰＣを行っても良い。
【０２１０】
また、上記各実施形態では、光ディスクがＣＤ−Ｒの場合について説明したが、これに限定されるものではなく、光源をパルス発光して情報を記録する情報記録媒体であれば良い。
【０２１１】
また、上記各実施形態では、情報の記録及び再生が可能な光ディスク装置について説明したが、これに限らず、情報の記録、再生及び消去のうち、少なくとも情報の記録が可能な光ディスク装置であれば良い。
【０２１２】
また、上各実施形態では、光源が１つの場合について説明したが、本発明がこれに限定されるものではない。
【０２１３】
【発明の効果】
以上説明したように、本発明に係る記録条件設定方法によれば、情報記録媒体への高速度での記録に最適な記録条件を設定することができるという効果がある。
【０２１４】
また、本発明に係るプログラム及び記録媒体によれば、光ディスク装置の制御用コンピュータにて実行され、情報記録媒体への高速度での記録に最適な記録条件を設定することができるという効果がある。
【０２１５】
また、本発明に係る光ディスク装置によれば、記録品質に優れた記録を高速度で安定して行うことができるという効果がある。
【図面の簡単な説明】
【図１】本発明の第１の実施形態に係る光ディスク装置の構成を示すブロック図である。
【図２】図１における光ピックアップ装置の詳細構成を説明するためのブロック図である。
【図３】図１における再生信号処理回路の詳細構成を説明するためのブロック図である。
【図４】図１におけるレーザコントロール回路の詳細構成を説明するためのブロック図である。
【図５】パルス幅補正値を説明するための図である。
【図６】本発明の第１の実施形態に係る記録条件設定処理を説明するためのフローチャートである。
【図７】内周側ＯＰＣ領域及び外周側ＯＰＣ領域を説明するための図である。
【図８】図８（Ａ）及び図８（Ｂ）は、それぞれ内周ＯＰＣの結果と外周ＯＰＣの結果とから記録速度Ｖｒでの平均パワー及びパルス幅補正値を算出する方法を説明するための図である。
【図９】内周ＯＰＣの結果のみから記録速度Ｖｒでの最適な記録パワー及びパルス幅補正値を算出する場合を説明するためのフローチャートである。
【図１０】本発明の第２の実施形態に係る記録条件設定処理を説明するためのフローチャートである。
【図１１】本発明の第２の実施形態に係る記録条件設定処理の変形例を説明するためのフローチャートである。
【図１２】記録品質を監視する場合に用いられる再生信号処理回路の詳細構成を説明するためのブロック図である。
【図１３】記録品質を監視する処理を説明するためのフローチャートである。
【図１４】記録禁止情報に基づいて記録の可否判断を行う処理を説明するためのフローチャートである。
【符号の説明】
１５…光ディスク（情報記録媒体）、２０…光ディスク装置（光ディスク装置）、３９…ＲＯＭ（記録媒体）、４０…ＣＰＵ（試し書き手段、第１の平均値算出手段、第２の平均値算出手段、記録条件設定手段、記録手段、第１の試し書き手段、第２の試し書き手段、識別情報取得手段、品質取得手段、判別手段、記録禁止手段、出力手段）。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording condition setting method, a program and a recording medium, and an optical disc device, and more particularly to a recording method for setting recording conditions when recording information on an information recording medium having a spiral or concentric recording area. The present invention relates to a condition setting method, a program used in an optical disc device, a recording medium on which the program is recorded, and an optical disc device for recording information on an information recording medium.
[0002]
[Prior art]
2. Description of the Related Art In recent years, personal computers have been able to handle AV (Audio-Visual) information such as music and video as their functions have improved. Since the amount of the AV information is very large, optical disks such as CDs (compact discs) and DVDs (digital versatile discs) have attracted attention as information recording media. It has become popular as one of the peripheral devices of computers. In an optical disk device, recording or erasing of information is performed by irradiating a minute spot of a laser beam onto a recording surface of an optical disk on which a spiral or concentric track is formed, and information is reproduced based on reflected light from the recording surface. And so on. The optical disc device is provided with an optical pickup device for irradiating the recording surface of the information recording medium with laser light and receiving light reflected from the recording surface.
[0003]
In general, an optical pickup device includes a light source that emits laser light at a predetermined light emission power (output), guides laser light emitted from the light source to a recording surface of an information recording medium, and transmits laser light reflected by the recording surface. An optical system for guiding to a predetermined light receiving position, a light receiving element disposed at the light receiving position, and the like are provided.
[0004]
In an optical disc, information is recorded by the length of each of two areas called a mark (pit) area and a space area having different reflectances and a combination thereof. Therefore, when recording information on the optical disc, the light emission power of the light source is controlled so that a mark area and a space area are formed at predetermined positions.
[0005]
For example, in a write-once optical disc such as a CD-R (CD-recordable), a DVD-R (DVD-recordable), and a DVD + R (DVD + recordable) containing an organic dye in the recording layer, the light emission power is increased when forming a mark area. The dye is heated and melted, and the part of the substrate that is in contact with it is altered and deformed. On the other hand, when the space region is formed, the light emission power is set to be as low as during reproduction so that the substrate does not deteriorate or deform. As a result, the reflectance in the mark area is lower than that in the space area. In the following, the light emission power when forming the mark area is also referred to as recording power.
[0006]
However, even in the case of an optical disk including an organic dye in the recording layer, the type of the organic dye, the thickness of the recording layer, the width of the track pitch, and the like are slightly different depending on the manufacturer (vendor). This means that even if the recording power is the same, a mark area having a predetermined shape is not always formed depending on the optical disc. If a mark area having a predetermined shape is not formed at the time of recording information, it becomes difficult to accurately reproduce the information, and so-called recording quality is degraded.
[0007]
Therefore, a write-once optical disc is provided with a test writing area for detecting an optimum recording power for the optical disc. This area is called a power calibration area (hereinafter, referred to as “PCA”). For example, in a CD-R, the PCA area has a test area divided into 100 partitions. Each partition of the test area is composed of 15 frames. Normally, when recording information on a write-once optical disk, the optical disk apparatus uses one partition to increase the recording power for each frame at a constant linear velocity at a predetermined step centered on a predetermined reference value (reference power). Thus, so-called OPC (Optimum Power Control) processing is performed in which predetermined data is trial-written by changing stepwise and the recording power showing the highest recording quality is determined as the optimum recording power.
[0008]
In the case of an optical disc on which information is recorded at a constant linear density, recording is usually performed while rotating the optical disc at a constant linear velocity (CLV), so that the relative speed between the recording surface and the laser beam is always constant. It is. Therefore, even if information is recorded on the entire recording surface using the recording power determined by the OPC, the recording quality does not deteriorate.
[0009]
However, with the increase in recording speed, the above-mentioned CLV method requires a higher rotation speed toward the inner circumference side, so that the motor cost increases, noise and vibration increase, and other servo system design. Also becomes difficult. Therefore, there is a case where a method is adopted in which the rotational speed on the inner peripheral side is not increased so much, but the rotational speed is also decreased on the outer peripheral side. In particular, when the rotation speed is constant, it is called a CAV (Constant Angular Velocity) system. In the CAV method, the linear velocity increases in proportion to the distance from the rotation center.
[0010]
Also, there is a so-called zone CLV (ZCLV: Zone CLV) system in which a recording area is divided into a plurality of zones at appropriate positions, and a CLV system is used in each zone, and a linear velocity is set higher in an outer zone. In either of the CAV method and the ZCLV method, the linear velocity at the time of trial writing and the linear velocity at the time of actually recording information may be different. Therefore, there is a disadvantage that the recording power determined by OPC may not always be the optimum recording power.
[0011]
In order to remedy this inconvenience, for example, Japanese Patent Application Laid-Open No. 2000-200416 (hereinafter referred to as a “first known example”) discloses that when data is additionally written or rewritten in a recording area of an optical disk by the CAV method, An optical disk device that performs OPC at the same linear velocity as a linear velocity at a writing position is disclosed.
[0012]
Also, for example, Japanese Patent Application Laid-Open No. 9-288825 (hereinafter referred to as "second known example") discloses that when recording data in a recording area of an optical disc by the ZCLV method, a recording power distribution in a zone where data is recorded is determined. An optical disk device for correction is disclosed. In this optical disc device, at least two test writing areas are set for each zone, and the recording power distribution in each zone is calculated using the optimum recording power obtained by the test writing in these test writing areas. Has been corrected.
[0013]
[Problems to be solved by the invention]
However, in the inner peripheral portion of the optical disc, there is a limit to the linear velocity at which test writing is possible. Therefore, in the optical disc apparatus disclosed in the first known example, the linear velocity at the time of recording (hereinafter referred to as “recording linear velocity”) ), It may not be possible to obtain the optimum recording power at the recording linear velocity. Further, when the recording linear velocity changes during recording, test writing is performed at a plurality of linear velocities, so that there is an inconvenience that the time required for the recording process becomes longer.
[0014]
Further, the optimum recording power greatly varies depending on the pulse width of the drive signal of the light source during recording (also referred to as “recording pulse”). The shape of the recording pulse is also called a recording strategy and has a great influence on the recording quality. Generally, this recording strategy depends on the linear velocity. However, in the optical disk device disclosed in the above-described second known example, only the optimum recording power obtained by test writing at different linear velocities is taken into account without considering the difference in the recording strategy due to the linear velocities. Since the recording power distribution is corrected based on this, there is a disadvantage that the corrected recording power distribution may not always be the optimum recording power distribution.
[0015]
The present invention has been made under such circumstances, and a first object of the present invention is to provide a recording condition setting method capable of setting optimum recording conditions for high-speed recording on an information recording medium. It is in.
[0016]
A second object of the present invention is executed by a computer for controlling an optical disk device, and a program capable of setting optimum recording conditions for high-speed recording on an information recording medium, and a program storing the program. To provide a recording medium.
[0017]
A third object of the present invention is to provide an optical disk device capable of stably performing high-quality recording at a high speed.
[0018]
[Means for Solving the Problems]
The invention according to claim 1 is a recording condition setting method for setting recording conditions when recording information on an information recording medium having a spiral or concentric recording area by emitting light from a light source in pulses, A first step of performing test writing at a predetermined linear velocity in at least one test writing area provided on the information recording medium; and emitting light of the light source at the predetermined linear velocity based on a processing result in the first step. A second step of calculating an average value of power; a third step of calculating an average value of light emission power of the light source at an arbitrary linear velocity based on the average value calculated in the second step; A fourth step of obtaining an optimum recording power at the arbitrary linear velocity based on the average value calculated in the step, and setting recording conditions at the arbitrary linear velocity based on the recording power. Recording conditions A constant way.
[0019]
According to this, at the time of setting the recording conditions, test writing is performed at a predetermined linear velocity in at least one test writing area provided on the information recording medium (first step), and based on the processing result there, a predetermined writing is performed. The average value of the light emission power of the light source at the linear velocity is calculated (second step). Then, an average value of the light emission power of the light source at an arbitrary linear velocity is calculated based on the average value of the light emission power of the light source at the predetermined linear velocity calculated in the second step (third step). Based on the recording power, an optimum recording power at an arbitrary linear velocity is obtained, and recording conditions at an arbitrary linear velocity are set based on the recording power (fourth step). Since the average value of the light emission power includes information on the recording strategy, even if the recording linear velocity and the linear velocity in test writing are different, for example, the optimum recording power at the recording linear velocity can be accurately determined. You can ask. Therefore, as a result, it is possible to set optimum recording conditions for high-speed recording on the information recording medium.
[0020]
In this case, as in the recording condition setting method according to claim 2, when the optimum recording power at the arbitrary linear velocity is equal to or higher than a predetermined value, the recording area is higher than the recording area recorded at the arbitrary linear velocity. The recording area on the outer peripheral side may further include a fifth step of setting the recording speed to be substantially the same as the arbitrary linear velocity. In such a case, after the optimum recording power reaches, for example, the maximum output of the light source, recording is performed by the CLV method, and an information recording medium with low recording sensitivity can be used effectively. Further, a light source having a low maximum output can be used.
[0021]
In each of the recording condition setting methods according to the first and second aspects, as in the recording condition setting method according to the third aspect, the trial writing area includes a first trial writing area and a second trial writing area. In this case, in the first step, a first test writing is performed in the first test writing area at a first linear velocity, and a second test writing different from the first linear velocity is performed in the second test writing area. The second test writing can be performed at the linear velocity of. In such a case, the optimum recording power at an arbitrary linear velocity can be obtained based on the results of a plurality of test writings having different linear velocities, so that the optimum recording power at the recording linear velocity can be obtained with high accuracy. be able to. Therefore, as a result, it is possible to set optimum recording conditions for high-speed recording on the information recording medium.
[0022]
In this case, as in the recording condition setting method according to claim 4, in the second step, the first light emission power of the light source at the first linear velocity is determined based on a result of the first test writing. Calculating an average value, calculating a second average value of the light emission power of the light source at the second linear velocity based on the result of the second test writing, and in the third step, calculating the first average An average value of the light emission power at the arbitrary linear velocity can be calculated based on the value and the second average value.
[0023]
In each of the recording condition setting methods according to the third and fourth aspects, as in the recording condition setting method according to the fifth aspect, the second linear velocity is a linear velocity specified externally. Can be. In such a case, for example, it is possible to select a linear velocity at which stable OPC is possible for each type of information recording medium by a user's judgment, so that an optimal recording condition can be set in a short time.
[0024]
In each of the recording condition setting methods according to the third to fifth aspects, as in the recording condition setting method according to the sixth aspect, one of the first linear velocity and the second linear velocity is the information recording. It can be higher than the linear velocity at the time of recording information on the medium. In such a case, the recording power at the recording linear velocity can be obtained with high accuracy.
[0025]
The invention according to claim 7 is a recording condition setting method for setting recording conditions when recording information on an information recording medium having a spiral or concentric recording region by emitting light from a pulsed light source, Performing first test writing at a first linear velocity at a plurality of positions in a first test writing area provided on the information recording medium while changing the light emission power of the light source with respect to a predetermined reference value; A second step of obtaining a reference value of the light emission power of the light source in test writing at a second linear velocity different from the first linear velocity based on a result of the first trial writing; While varying the light emission power of the light source with respect to the reference value obtained in the second step, the second linear velocity is set at a plurality of positions in a second test writing area provided on the information recording medium. A third step of performing test writing of the second test; A recording condition setting method comprising: based on a result of writing, the determined optimum recording power at the second linear velocity, the fourth step and setting the recording condition based on the recording power.
[0026]
According to this, when setting the recording conditions, the first linear velocity is set at a plurality of positions in the first test writing area provided on the information recording medium while changing the light emission power of the light source with respect to a predetermined reference value. Performs the first test writing (first step), and based on the result, the reference value of the light emission power of the light source in the test writing at the second linear velocity different from the first linear velocity is obtained (second step). 2 steps). Next, while varying the light emission power of the light source with respect to the reference value obtained in the second step, the light emission power at the second linear velocity is set at a plurality of positions in a second test writing area provided on the information recording medium. 2 is performed (third step). Then, based on the result of the second test writing, the optimum recording power at the second linear velocity is obtained, and the recording condition for recording information on the information recording medium is set based on the recording power. (4th process). That is, since the reference value of the light emission power of the light source at the second linear velocity is obtained based on the result of the test writing at the first linear velocity, the optimum value at the reference value and the second linear velocity is obtained. The recording power is a very close value. Therefore, the accuracy of the optimum recording power obtained from the result of the test writing at the second linear velocity is improved, and as a result, the optimum recording conditions for high-speed recording on the information recording medium can be set. It becomes.
[0027]
In this case, as in the recording condition setting method according to claim 8, the fluctuation width of the light emission power in the second test writing is smaller than the fluctuation width of the light emission power in the first test writing. can do. In such a case, the fluctuation amount of the light emission power in the second test writing can be reduced, so that the optimum recording power at the second linear velocity can be accurately obtained.
[0028]
In each of the recording condition setting methods according to the seventh and eighth aspects, as in the recording condition setting method according to the ninth aspect, the number of times the light emission power changes in the second trial writing is equal to the first trial writing. Is smaller than the number of times the light emission power fluctuates. In such a case, the time required to set the recording conditions can be reduced, and the second trial writing area can be used effectively.
[0029]
In each of the recording condition setting methods according to the third to ninth aspects, as in the recording condition setting method according to the tenth aspect, the second test writing area is located closer to the outer periphery than the first test writing area. And the second linear velocity is higher than the first linear velocity.
[0030]
In each of the recording condition setting methods according to claims 3 to 10, as in the recording condition setting method according to claim 11, the first test writing area is a data area where information is recorded on the information recording medium. And the second test writing area is located on the outer peripheral side of the data area.
[0031]
According to a twelfth aspect of the present invention, there is provided a program used in an optical disc apparatus for recording information in a spiral or concentric recording area of an information recording medium by pulsing a light source, the program being provided on the information recording medium. A first procedure of performing trial writing at a predetermined linear velocity in at least one trial writing area; and calculating an average value of light emission power of the light source at the predetermined linear velocity based on a processing result in the first procedure. A second procedure of calculating the average value of the emission power of the light source at an arbitrary linear velocity based on the average value calculated in the second procedure; and A fourth procedure for obtaining the optimum recording power at an arbitrary linear velocity based on the calculated average value; and a computer for controlling the optical disk device.
[0032]
According to this, at the time of setting the recording conditions, test writing is performed at a predetermined linear velocity in at least one test writing area provided on the information recording medium (first procedure), and the processing result in the first procedure is obtained. Based on this, the average value of the light emission power of the light source at a predetermined linear velocity is calculated (second procedure). Then, based on the average value of the light emission power of the light source at the predetermined linear velocity calculated in the second procedure, the average value of the light emission power of the light source at an arbitrary linear velocity is calculated (third procedure). The optimum recording power at an arbitrary linear velocity is obtained based on the average value calculated in the third procedure (fourth procedure). Since the average value of the light emission power includes information on the recording strategy, even if the recording linear velocity and the linear velocity in test writing are different, for example, the optimum recording power at the recording linear velocity can be accurately determined. You can ask. Therefore, as a result, it is possible to set optimum recording conditions for high-speed recording on the information recording medium.
[0033]
In this case, as in the program according to claim 13, when the optimum recording power at the arbitrary linear velocity is equal to or more than a predetermined value, the recording area on the outer peripheral side with respect to the recording area recorded at the arbitrary linear velocity. In the recording area, the control computer may further execute a fifth procedure for setting the recording speed to be substantially the same as the arbitrary linear velocity. In such a case, after the optimum recording power reaches, for example, the maximum output of the light source, recording is performed by the CLV method, and an information recording medium with low recording sensitivity can be used effectively. Further, a light source having a low maximum output can be used.
[0034]
In each of the programs according to claims 12 and 13, when the test write area includes a first test write area and a second test write area as in the program according to claim 14, As a first procedure, a first trial writing is performed at a first linear velocity in the first trial writing area, and a second trial writing is performed at a second linear velocity different from the first linear velocity in the second trial writing area. 2 may be executed by the control computer. In such a case, the optimum recording power at an arbitrary linear velocity can be obtained based on the results of a plurality of test writings having different linear velocities, so that the optimum recording power at the recording linear velocity can be obtained with high accuracy. be able to. Therefore, as a result, it is possible to set optimum recording conditions for high-speed recording on the information recording medium.
[0035]
In this case, as in the program according to claim 15, as the second procedure, a first average value of the light emission power of the light source at the first linear velocity based on a result of the first test writing Is calculated, and a second average value of the light emission power of the light source at the second linear velocity is calculated based on the result of the second test writing. As the third procedure, the first average value is calculated. The control computer may be caused to execute a procedure of calculating an average value of the light emission power at the arbitrary linear velocity based on and the second average value.
[0036]
In each of the programs according to the fourteenth and fifteenth aspects, as in the program according to the sixteenth aspect, the second linear velocity may be an externally designated linear velocity. In such a case, for example, the linear velocity at which stable OPC can be performed can be selected for each type of information recording medium by the user's judgment, and the optimal recording conditions can be obtained in a short time.
[0037]
In each of the programs according to claims 14 to 16, as in the program according to claim 17, one of the first linear velocity and the second linear velocity records information on the information recording medium. Or higher than the linear velocity at that time. In such a case, the recording power at the recording linear velocity can be obtained with high accuracy.
[0038]
An invention according to claim 18 is a program used in an optical disc device for recording information in a spiral or concentric recording area of an information recording medium by emitting light from a light source in a pulsed manner. A first procedure of performing a first test writing at a first linear velocity at a plurality of positions in a first test writing area provided on the information recording medium while varying the reference value; A second procedure for obtaining a reference value of the light emission power of the light source in test writing at a second linear velocity different from the first linear velocity, based on the result of the trial writing of; A second test writing is performed at a plurality of positions in a second test writing area provided on the information recording medium at the second linear velocity while changing the reference value obtained in the second procedure. A third procedure; the second trial document Is a program for executing a control computer of the optical disk device; based on the results, a fourth process for obtaining an optimum recording power in said second linear velocity.
[0039]
According to this, when setting the recording conditions, the first linear velocity is set at a plurality of positions in the first test writing area provided on the information recording medium while changing the light emission power of the light source with respect to a predetermined reference value. Performs the first test writing (first procedure), and based on the result, the reference value of the light source power of the light source in the test writing at the second linear velocity different from the first linear velocity is obtained ( Second procedure). Then, while varying the light emission power of the light source with respect to the reference value obtained in the second procedure, the second linear velocity is set at a plurality of positions in the second test writing area provided on the information recording medium. Is performed (third procedure), and the optimum recording power at the second linear velocity is obtained based on the result (fourth procedure). That is, since the reference value of the light emission power at the second linear velocity is obtained based on the result of the test writing at the first linear velocity, the reference value and the optimum recording power at the second linear velocity are obtained. Is a very close value. Therefore, the accuracy of the optimum recording power obtained from the result of the test writing at the second linear velocity is improved, and as a result, the optimum recording conditions for high-speed recording on the information recording medium can be set. It becomes.
[0040]
In this case, as in the program according to claim 19, the fluctuation width of the light emission power in the second test writing is smaller than the fluctuation width of the light emission power in the first test writing. it can. In such a case, the fluctuation amount of the light emission power in the second test writing can be reduced, so that the optimum recording power at the second linear velocity can be accurately obtained.
[0041]
In each of the programs according to claims 18 and 19, as in the program according to claim 20, the number of times the light emission power fluctuates in the second test writing is the fluctuation of the light emission power in the first test writing. It can be less than the number of times. In such a case, the time required to set the recording conditions can be reduced, and the second trial writing area can be used effectively.
[0042]
In each of the programs according to claims 14 to 20, as in the program according to claim 21, the second test writing area is located on an outer peripheral side of the first test writing area, and May be higher than the first linear velocity.
[0043]
In each of the programs according to claims 14 to 21, as in the program according to claim 22, the first test writing area is located on an inner peripheral side of a data area where information is recorded on the information recording medium. The second test writing area may be located on the outer peripheral side of the data area.
[0044]
An invention according to claim 23 is a computer-readable recording medium in which the program according to any one of claims 12 to 22 is recorded.
[0045]
According to this, since the program according to any one of claims 12 to 22 is recorded, when the program is executed by a computer, the optimum recording condition for high-speed recording on the information recording medium is determined. It can be set.
[0046]
An invention according to claim 24 is an optical disc device for recording information in a spiral or concentric recording area of an information recording medium by pulsing a light source, wherein at least one test disk provided on the information recording medium is provided. Test writing means for performing test writing at a predetermined linear velocity in a writing area; first average value for calculating an average value of the light emission power of the light source at the predetermined linear velocity based on a result of the test writing means Calculating means for calculating an average value of the light emission power of the light source at a recording speed when information is recorded on the information recording medium, based on the average value calculated by the first average value calculating means; Average value calculating means; and an optimum recording power at the recording speed is determined based on the average value calculated by the second average value calculating means, and the recording conditions at the recording speed are determined based on the recording power. Recording means for recording information on the information recording medium based on the recording condition; and a recording condition setting means for setting an optical disc apparatus equipped with a.
[0047]
According to this, test writing is performed at a predetermined linear velocity by the test writing unit in at least one test writing area provided on the information recording medium, and based on the result, the first average value calculating unit performs the predetermined writing. The average value of the light emission power of the light source at the linear velocity is calculated. Next, based on the average value calculated by the first average value calculating means, the second average value calculating means calculates the average value of the light emission power of the light source at the recording speed when information is recorded on the information recording medium. Is calculated. Then, based on the calculation result, the optimum recording power at the recording speed is obtained by the recording condition setting means, and the recording condition at the recording speed is set based on the recording power. Further, information is recorded on the information recording medium by the recording means based on the set recording conditions. Since the average value of the light emission power includes information about the recording strategy, even if the recording speed and the linear speed in test writing are different, it is possible to accurately determine the optimum recording power at the recording speed. it can. Therefore, as a result, it is possible to stably perform recording with excellent recording quality at a high speed.
[0048]
An invention according to claim 25 is an optical disc apparatus for recording information in a spiral or concentric recording area of an information recording medium by pulsing a light source, wherein the light emission power of the light source is set to a predetermined reference value. First test writing means for performing first test writing at a first linear velocity at a plurality of positions in a first test writing area provided on the information recording medium while varying the first test writing; Reference value obtaining means for obtaining a reference value of the light emission power of the light source in test writing at a second linear velocity different from the first linear velocity based on a result of writing; A second test writing at a second linear velocity at a plurality of positions in a second test writing area provided on the information recording medium while changing the reference value obtained by the acquisition unit; Test writing means; and the second test Recording condition setting means for determining an optimum recording power at the second linear velocity based on the result of the recording and setting recording conditions for recording information on the information recording medium based on the recording power; Recording means for recording information on the information recording medium based on the recording conditions.
[0049]
According to this, the first test writing means varies the light emission power of the light source with respect to the predetermined reference value, and sets the first test writing means at a plurality of positions in the first test writing area provided on the information recording medium. The first test writing is performed at the linear velocity. Next, based on the result of the first test writing, a reference value of the light emission power of the light source in the test writing at the second linear velocity is obtained by the reference value obtaining means. Subsequently, while changing the light emission power of the light source with respect to the reference value obtained by the reference value obtaining means by the second test writing means, a plurality of positions within the second test writing area provided on the information recording medium are provided. Then, a second trial writing is performed at the second linear velocity. Then, the recording condition setting means obtains the optimum recording power at the second linear velocity based on the result of the second test writing, and uses the recording power when recording information on the information recording medium based on the recording power. Recording conditions are set. Further, information is recorded on the information recording medium by the recording means based on the set recording conditions. That is, since the reference value of the light emission power at the second linear velocity is obtained based on the result of the test writing at the first linear velocity, the reference value and the optimum recording power at the second linear velocity are obtained. Is a very close value. Accordingly, the accuracy of the optimum recording power obtained from the result of the test writing at the second linear velocity is improved, and as a result, it is possible to perform high-quality recording stably at a high speed.
[0050]
In this case, as in the optical disk device according to claim 26, identification information acquisition means for acquiring identification information of the information recording medium; at least a recording area in which the information is recorded after the recording by the recording means is completed. Quality acquisition means for reproducing a part and acquiring an index indicating the quality of the reproduction signal; and determining whether or not the quality of the reproduction signal satisfies a predetermined standard based on the index acquired by the quality acquisition means. Discriminating means for discriminating; when the discrimination result indicates that the quality of the reproduced signal does not satisfy a predetermined standard, recording prohibiting means for prohibiting recording at the recording speed on the information recording medium having the identification information; ; May be further provided. In such a case, recording at a recording speed determined to be of poor recording quality is prohibited thereafter, so that recording on an information recording medium under recording conditions that result in unstable reproduction of information is prevented. It is possible to do.
[0051]
In this case, as in the optical disk device according to claim 27, the index includes a value calculated by (dLp + dLb) / (dLp-dLb) using the peak level dLp and the bottom level dLb of the reproduction signal. It can be. Alternatively, as in the optical disk device according to claim 28, the index may include at least one of the number of errors detected and the error occurrence rate detected when decoding the reproduction signal. In such a case, the quality of the reproduced signal can be determined without requiring a new circuit or the like.
[0052]
In the optical disk device according to the twenty-sixth to twenty-eighth aspects, when the recording is prohibited by the recording prohibiting means as in the optical disk device according to the twenty-ninth aspect, recording at a designated recording speed is impossible. Output means may be provided for outputting at least one of the record disable information indicating the presence and the maximum recordable speed to an external device. In such a case, since the external device or the user can recognize that the recording speed needs to be changed, it is necessary to change the recording speed and perform recording with excellent recording quality even on an information recording medium having low recording sensitivity. Becomes possible.
[0053]
BEST MODE FOR CARRYING OUT THE INVENTION
<< 1st Embodiment >>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0054]
FIG. 1 is a block diagram showing a schematic configuration of an optical disk device according to the first embodiment of the present invention.
[0055]
The optical disk device 20 shown in FIG. 1 includes a spindle motor 22 for rotating and driving the optical disk 15, an optical pickup device 23, a laser control circuit 24, an encoder 25, a motor driver 27, a reproduction signal processing circuit 28, a servo controller 33, A buffer RAM 34, a buffer manager 37, an interface 38, a ROM 39, a CPU 40, a RAM 41, and the like are provided. Note that the arrows in FIG. 1 indicate typical flows of signals and information, and do not indicate all of the connection relationships of the respective blocks. In the present embodiment, an information recording medium conforming to the CD-R standard is used as the optical disc 15 as an example.
[0056]
The optical pickup device 23 is a device for irradiating the recording surface of the optical disk 15 with the spiral or concentric tracks formed thereon with laser light and receiving the reflected light from the recording surface. The optical pickup device 23 includes, as an example, a light source unit 51, a collimator lens 52, a beam splitter 54, an objective lens 60, a detection lens 58, a light receiver 59, and a drive system (a focusing actuator, a tracking actuator, A seek motor (both not shown) and the like are provided.
[0057]
The light source unit 51 includes a semiconductor laser (not shown) as a light source that emits a light beam having a wavelength of 780 nm. In the present embodiment, the direction of maximum intensity emission of the light beam emitted from the light source unit 51 is defined as the + X direction. The collimating lens 52 is disposed on the + X side of the light source unit 51, and converts a light beam emitted from the light source unit 51 into substantially parallel light.
[0058]
On the + X side of the collimator lens 52, the beam splitter 54 for splitting the return light beam from the optical disk 15 in the -Z direction is arranged. On the + X side of the beam splitter 54, the objective lens 60 for condensing the light flux transmitted through the beam splitter 54 and forming a light spot on the recording surface of the optical disk 15 is arranged.
[0059]
On the −Z side of the beam splitter 54, the detection lens 58 that collects the return light beam split by the beam splitter 54 is disposed. On the -Z side of the detection lens 58, the light receiver 59 is arranged. As the light receiver 59, a four-divided light receiving element is used as in a normal optical disk device. The light receiver 59 receives the reflected light from the recording surface of the optical disk 15 and outputs a signal including wobble signal information, reproduced data information, focus error information, track error information, and the like, similarly to a normal optical pickup device. .
[0060]
The operation of the optical pickup device 23 configured as described above will be briefly described. A light beam emitted from the light source unit 51 is converted into substantially parallel light by the collimator lens 52 and then enters the beam splitter 54. The light beam transmitted through the beam splitter 54 is focused as a minute spot on the recording surface of the optical disk 15 via the objective lens 60. The light reflected on the recording surface of the optical disk 15 is converted into substantially parallel light by the objective lens 60 as a return light flux, and is incident on the beam splitter 54. The return light beam branched in the −Z direction by the beam splitter 54 is received by a light receiver 59 via a detection lens 58. From the light receiver 59, a signal corresponding to the amount of received light is output to the reproduction signal processing circuit 28.
[0061]
As shown in FIG. 3, the reproduction signal processing circuit 28 includes an I / V amplifier 28a, a servo signal detection circuit 28b, a wobble signal detection circuit 28c, an RF signal detection circuit 28d, an ATIP decoder 28e, a CD decoder 28f, and a CD-ROM. It comprises a ROM decoder 28g and a D / A converter 28h. The I / V amplifier 28a converts a current signal, which is an output signal of the light receiver 59, into a voltage signal and amplifies the voltage signal with a predetermined gain. The servo signal detection circuit 28b detects a servo signal (focus error signal or track error signal) based on the output signal of the I / V amplifier 28a. The detected servo signal is output from the reproduction signal processing circuit 28 to the servo controller 33. The wobble signal detection circuit 28c detects a wobble signal based on the output signal of the I / V amplifier 28a. The ATIP decoder 28e extracts ATIP (Absolute Time In Pregroove) information and a synchronization signal from the wobble signal. The ATIP information extracted here is output to the CPU 40, and the synchronization signal is output to the encoder 25. The RF signal detection circuit 28d detects an RF signal based on the output signal of the I / V amplifier 28a. The CD decoder 28f performs error correction processing and the like on the RF signal. The CD-ROM decoder 28g further performs error correction processing and the like on the signal from the CD decoder 28f, and stores the signal in the buffer RAM 34 via the buffer manager 37. In the case of music data, a signal from the CD decoder 28f is output to an external audio device or the like via a D / A converter 28h.
[0062]
Returning to FIG. 1, the servo controller 33 generates a control signal for controlling the focusing actuator of the optical pickup device 23 based on the focus error signal, and controls the tracking actuator of the optical pickup device 23 based on the track error signal. Generate a signal. Each control signal is output from the servo controller 33 to the motor driver 27.
[0063]
The motor driver 27 controls a tracking actuator and a focusing actuator of the optical pickup device 23 based on a control signal from the servo controller 33. That is, tracking control and focus control are performed. Note that when the optical disk 15 is being accessed during recording processing, reproduction processing, or the like, tracking control and focus control are performed as needed. Further, the motor driver 27 controls the spindle motor 22 and the seek motor of the optical pickup device 23 based on an instruction from the CPU 40.
[0064]
The encoder 25 extracts the data stored in the buffer RAM 34 via the buffer manager 37 based on an instruction from the CPU 40, adds an error correction code, and generates a write signal to the optical disk 15. The write signal is output to the laser control circuit 24 in synchronization with a synchronization signal from the reproduction signal processing circuit 28 based on an instruction from the CPU 40.
[0065]
The laser control circuit 24 includes an LD driver 24a, a pulse setting circuit 24b, a power setting circuit 24c, and the like, as shown in FIG. The pulse setting circuit 24b changes the pulse width based on an instruction from the CPU 40 by shifting the rising edge of the write signal (WDATA) from the encoder 25 forward by θ as shown in FIG. 5, for example. The power setting circuit 24c sets the recording power based on an instruction from the CPU 40. The LD driver 24a controls the output of the semiconductor laser of the optical pickup device 23 based on the write signal (WD1) pulse-adjusted by the pulse setting circuit 24b and the recording power set by the power setting circuit 24c.
[0066]
Returning to FIG. 1, the interface 38 is a two-way communication interface with a host (for example, a personal computer) 49, and conforms to a standard interface such as ATAPI (AT Attachment Packet Interface) and SCSI (Small Computer System Interface). I have.
[0067]
The ROM 39 stores a program including a program (hereinafter, referred to as a “first recording condition setting program”) for setting a recording condition described later, which is described in a code decodable by the CPU 40.
[0068]
The CPU 40 controls the operation of each unit according to a program stored in the ROM 39, and temporarily stores data and the like necessary for the control in the RAM 41. When the power of the optical disk device 20 is turned on, the program stored in the ROM 39 is loaded into a main memory (not shown) of the CPU 40.
[0069]
Next, a process of setting optimum recording conditions when recording information on the optical disk 15 in the optical disk device 20 configured as described above will be described with reference to FIG. The flowchart in FIG. 6 corresponds to a series of processing algorithms executed by the CPU 40. For example, when a recording request command is received from the host 49, the start address of the program corresponding to the flowchart of FIG. In this embodiment, as shown in FIG. 7, it is assumed that a PCA area that can be used for the OPC operation is provided on the inner peripheral side of the lead-in area and the outer peripheral side of the lead-out area of the optical disc 15. . It is assumed that each PCA area includes a plurality of partitions.
[0070]
In the first step 401, test writing (first test writing: hereinafter also referred to as "inner OPC") is performed in a PCA area (hereinafter also referred to as "inner PCA area") provided on the inner side of the lead-in area. A predetermined linear velocity Vi is set as the linear velocity (first linear velocity) at the time of performing. Also, a reference value (here, Psi) of the emission power of the semiconductor laser corresponding to the linear velocity Vi is set.
[0071]
In the next step 403, the inner circumference OPC at the linear velocity Vi is executed using a predetermined partition (first test writing area) in the inner circumference PCA area. That is, predetermined test data is recorded in each frame of the partition while the emission power of the semiconductor laser is varied in a predetermined step with respect to the reference value Psi.
[0072]
In the next step 405, for example, test-written data is reproduced, and the optimum recording power at the linear velocity Vi is determined based on the vertical symmetry and the amplitude of the reproduced signal, as in the related art. In the present embodiment, it is assumed that the optimum recording power Pwi has been obtained from the result of the inner circumference OPC. It is assumed that the pulse width correction value at this time is θvi. That is, the recording strategy at the linear velocity Vi is (n + θvi) T. T is the period of the recording channel clock, for example, 231 nanoseconds at 1 × speed (150 kbytes / sec). N is an integer of 3 to 11.
[0073]
In the next step 407, it is determined whether or not the inner circumference OPC has been completed normally. Whether the inner circumference OPC has been completed normally is determined based on the vertical symmetry, amplitude, and the like of the reproduced signal. Alternatively, the determination may be made based on whether or not the optimum recording power has been obtained. Here, since the optimum recording power Pwi has been obtained, the inner circumference OPC ends normally, the determination in step 407 is affirmed, and the process proceeds to step 409.
[0074]
In step 409, test writing (second test writing: hereinafter also referred to as "outer peripheral OPC") is performed in a PCA area (hereinafter, also referred to as "outer peripheral PCA area") provided on the outer peripheral side of the lead-out area. A predetermined linear velocity Vo is set as the linear velocity (second linear velocity). The linear velocity Vo is set to a value exceeding the linear velocity Vi in the inner circumference OPC and a value equal to or higher than the recording linear velocity (here, Vr). That is, the relationship is Vi <Vr <Vo. Further, a reference value (here, Pso) of the emission power of the semiconductor laser corresponding to the linear velocity Vo is also set.
[0075]
In the next step 411, outer peripheral OPC at a linear velocity Vo is performed using a predetermined partition (second test writing area) in the outer PCA area. That is, predetermined test data is recorded in each frame of the partition while the emission power of the semiconductor laser is varied in a predetermined step with respect to the reference value Pso.
[0076]
In the next step 413, the optimum recording power at the linear velocity Vo is determined in the same manner as in the case of the inner circumference OPC. In the present embodiment, it is assumed that the optimum recording power Pwo has been obtained from the result of the outer circumference OPC. It is assumed that the pulse width correction value at this time is θvo. That is, the recording strategy at the linear velocity Vo is (n + θvo) T.
[0077]
In the next step 415, it is determined whether or not the outer periphery OPC has been normally completed. Whether or not the outer circumference OPC has been completed normally is determined in the same manner as in the case of the inner circumference OPC. Here, since the optimum recording power Pwo has been obtained, the outer circumference OPC ends normally, the judgment in step 415 is affirmed, and the flow shifts to step 417.
[0078]
In step 417, the average value of the emission power of the semiconductor laser at the linear velocity Vi (hereinafter, also referred to as “average power” for convenience) is calculated based on the result of the inner circumference OPC. Here, first, a ratio of a high level to a low level (hereinafter, also referred to as a “recording pulse width ratio”) Twi in a write signal at a linear velocity Vi is obtained based on the following equation (1).
[0079]
Twi = 0.5 + dTi (1)
[0080]
Here, dTi is the amount of increase in the high level in the write signal at the linear velocity Vi, and is calculated from the following equation (2). Here, R (nT) is a probability that a high level having a width of nT (n = 3 to 11) appears in the write signal.
[0081]
(Equation 1)

[0082]
Then, the average power Pavi at the linear velocity Vi is calculated from the following equation (3). Here, Pb is a reproducing power.
[0083]
Pavi = Pwi × Twi + Pb × (1-Twi) (3)
[0084]
In the next step 419, the average power at the linear velocity Vo is calculated based on the result of the outer circumference OPC. Here, first, the recording pulse width ratio Two at the linear velocity Vo is obtained from the following equation (4).
[0085]
Two = 0.5 + dTo (4)
[0086]
Here, dTo is an increase amount of the high level in the write signal at the linear velocity Vo, and is calculated from the following equation (5).
[0087]
(Equation 2)

[0088]
Then, the average power Pavo at the linear velocity Vo is calculated from the following equation (6).
[0089]
Pavo = Pwo × Two + Pb × (1-Two) (6)
[0090]
In the next step 421, the average power (here, Pavr) at the recording linear velocity Vr is calculated based on the following equation (7) (see FIG. 8A).
[0091]
Pavr = (Pavo−Pavi) / (Vo−Vi) × Vr + (Pavi × Vo−Pavo × Vi) / (Vo−Vi) (7)
[0092]
In the next step 423, first, a pulse width correction value θvr at the recording linear velocity Vr is obtained based on the following equation (8) (see FIG. 8B).
[0093]
θvr = (θvo−θvi) / (Vo−Vi) × Vr + (θvi × Vo−θvo × Vi) / (Vo−Vi) (8)
[0094]
Next, the recording pulse width ratio Twr at the recording linear velocity Vr is obtained from the pulse width correction value θvr based on the following equation (9).
[0095]
[Equation 3]

[0096]
Then, the optimum recording power Pwr at the recording linear velocity Vr is calculated based on the following equation (10).
[0097]
Pwr = (Pavr−Pb × (1−Twr)) / Twr (10)
[0098]
In the next step 425, the recording power Pwr is output to the power setting circuit 24c, and the pulse width correction value θvr is output to the pulse setting circuit 24b. As a result, recording conditions for recording information on the optical disk 15 at the linear velocity Vr are set.
[0099]
In the next step 427, it is determined whether or not the calculated optimum recording power Pwr is less than a predetermined value. Here, if the optimum recording power Pwr is less than the predetermined value, the determination in step 425 is affirmed, and the processing for setting the recording condition ends.
[0100]
On the other hand, if the optimum recording power Pwr is equal to or more than the predetermined value in step 427, the determination in step 427 is denied, and the flow shifts to step 429.
[0101]
In step 429, the subsequent recording method is set to the CLV method. That is, the subsequent recording is performed at the linear velocity Vr. Then, the processing for setting the recording conditions is terminated.
[0102]
If the inner circumference OPC does not end normally in step 407, the determination in step 407 is denied, and the process proceeds to step 435.
[0103]
In this step 435, the linear velocity Vi of the inner peripheral OPC is reduced by one step to obtain a new linear velocity Vi of the inner peripheral OPC. Then, the process returns to step 403 described above. The partition on which the trial writing is performed is set near the partition on which the trial writing was performed last time.
[0104]
If the outer peripheral OPC has not been completed normally in step 415, the determination in step 415 is denied, and the routine goes to step 437.
[0105]
In step 437, the linear velocity Vo of the outer peripheral OPC is reduced by one step to a new linear velocity Vo of the outer peripheral OPC. Then, the process returns to step 411 described above. The partition on which the trial writing is performed is set near the partition on which the trial writing was performed last time.
[0106]
When the processing for setting the recording conditions is completed as described above, the processing shifts to a recording processing for recording the recording data from the host 49 in the designated recording area. Here, the recording process will be briefly described.
[0107]
The CPU 40 outputs a control signal for controlling the rotation of the spindle motor 22 to the motor driver 27 based on the recording speed. Further, the CPU 40 stores the recording data received from the host 49 in the buffer RAM 34 via the buffer manager 37.
[0108]
Then, the CPU 40 sends a signal for controlling the seek motor of the optical pickup device 23 to the motor driver 27 based on the ATIP information from the reproduction signal processing circuit 28 so that the optical pickup device 23 is located at the designated write start point. Output.
[0109]
When receiving from the buffer manager 37 that the amount of data accumulated in the buffer RAM 34 has exceeded a predetermined amount, the CPU 40 instructs the encoder 25 to generate a write signal. As a result, a write signal corresponding to the recording data from the host 49 is generated.
[0110]
When the CPU 40 determines that the position of the optical pickup device 23 is the writing start point based on the ATIP information, it instructs the encoder 25 to start writing. Thereby, the recording data from the host 49 is recorded in the designated recording area via the encoder 25, the laser control circuit 24, and the optical pickup device 23 based on the optimum recording conditions set as described above. Will be done.
[0111]
Next, the processing operation of the optical disk device 20 when a reproduction request command is received from the host 49 will be briefly described.
[0112]
When receiving the command of the reproduction request from the host 49, the CPU 40 outputs a control signal for controlling the rotation of the spindle motor 22 to the motor driver 27 based on the reproduction speed. The CPU 40 outputs a signal for controlling the seek motor to the motor driver 27 based on the ATIP information from the reproduction signal processing circuit 28 so that the optical pickup device 23 is located at the designated reading start point.
[0113]
When the CPU 40 determines that the position of the optical pickup device 23 is the reading start point based on the ATIP information, the CPU 40 notifies the reproduction signal processing circuit 28. As a result, the reproduction signal processing circuit 28 detects the RF signal based on the output signal of the light receiver 59, performs error correction processing and the like, and then stores the signal in the buffer RAM 34. The buffer manager 37 transfers the reproduced data stored in the buffer RAM 34 to the host 49 via the interface 38 when the data is prepared as sector data.
[0114]
As is apparent from the above description, in the first embodiment, the test writing unit, the first average value calculating unit, the second average value calculating unit, the recording A condition setting unit and a recording unit are realized. That is, the processing of steps 401 to 405 and steps 409 to 413 in FIG. However, the recording condition setting means is realized by the processing of steps 423 and 425, respectively. However, it goes without saying that the present invention is not limited to this. That is, the first embodiment is merely an example, and at least a part of each component realized by the processing according to the program by the CPU 40 may be configured by hardware, or all the components may be configured by hardware. It is good also as comprising.
[0115]
In the first embodiment, among the programs installed in the ROM 39, the first recording condition setting program is configured by a program corresponding to the processing shown in the flowchart of FIG.
[0116]
Then, the first step of the recording condition setting method according to the first embodiment is performed by the processing of steps 401 to 405 and steps 409 to 413 in FIG. 6, and the second step is performed by the processing of steps 417 and 419. Then, the third step is performed by the processing of step 421, and the fourth step is performed by the processing of steps 423 and 425.
[0117]
As described above, according to the optical disc apparatus and the recording condition setting method according to the first embodiment, the inner circumference OPC is performed at the linear velocity Vi, and the outer circumference OPC is performed at the linear velocity Vo (> Vi). Next, the average power at the linear velocity Vi is calculated based on the result of the inner circumference OPC, and the average power at the linear velocity Vo is calculated based on the result of the outer circumference OPC. Then, the average power at the recording linear velocity Vr is calculated based on the average power at the linear velocity Vi and the average power at the linear velocity Vo. Subsequently, the optimum recording power at the recording linear velocity Vr is obtained based on the calculation result, and the recording conditions at the recording linear velocity Vr are determined based on the recording power. That is, since the average power includes information about the recording strategy, even when the recording linear velocity and the linear velocity in test writing are different, it is necessary to accurately determine the optimum recording power at the recording linear velocity. Can be. Therefore, as a result, it is possible to set optimum recording conditions for high-speed recording on the information recording medium.
[0118]
According to the first embodiment, since the linear velocity Vi in the inner circumference OPC and the linear velocity Vo in the outer circumference OPC are different from each other, the optimum recording power at an arbitrary linear velocity can be accurately determined. You can ask.
[0119]
Further, according to the first embodiment, since the linear velocity Vo at the outer peripheral OPC is set to be higher than the linear velocity Vi at the inner peripheral OPC, the relationship between the linear velocity and the recording condition is reduced. It can be obtained with high accuracy.
[0120]
Further, according to the first embodiment, since the linear velocity Vo at the outer circumference OPC is set to be equal to or higher than the recording linear velocity Vr, it is necessary to accurately determine the optimum recording power at the recording linear velocity Vr. Can be.
[0121]
Further, according to the first embodiment, when the inner circumference OPC does not end normally, the linear velocity is reduced by one step and the inner circumference OPC is performed again. As a result, the reliability of the information obtained by the inner circumference OPC can be improved, and as a result, the optimum recording power at the recording linear velocity Vr can be accurately obtained.
[0122]
Further, according to the first embodiment, when the outer peripheral OPC does not end normally, the linear velocity is reduced by one step and the outer peripheral OPC is performed again. Thereby, the reliability of the information obtained by the outer peripheral OPC can be improved, and as a result, the optimum recording power at the recording linear velocity Vr can be obtained with high accuracy.
[0123]
Further, according to the first embodiment, when the optimum recording power Pwr at the calculated recording linear velocity Vr is equal to or more than a predetermined value, the subsequent recording is set to the CLV method. Thereby, good quality recording can be stably performed even on an optical disc having low recording sensitivity. In addition, even when a semiconductor laser having a low maximum output is used, good quality recording can be stably performed. Further, for example, by setting the predetermined value to a value near the maximum value of the rated power of the semiconductor laser, it is possible to prevent the recording power from being equal to or more than the maximum value of the rated power, thereby suppressing deterioration of the semiconductor laser. It becomes.
[0124]
Further, according to the optical disc apparatus of the first embodiment, it is possible to set optimum recording conditions for high-speed recording on the optical disc, and as a result, it is possible to stably perform recording with excellent recording quality at high speed. It is possible to do it.
[0125]
In the first embodiment, the case where the linear velocity in the inner circumference OPC is reduced by one step and the inner circumference OPC is executed again when the inner circumference OPC does not end normally has been described. However, the present invention is not limited to this. For example, when the optimum recording power obtained in the inner circumference OPC is equal to or more than a predetermined value, the linear velocity in the inner circumference OPC may be reduced by one step and the inner circumference OPC may be executed again. Further, even if the inner circumference OPC is normally completed, if the optimum recording power obtained in the inner circumference OPC is equal to or more than a predetermined value, the linear velocity in the inner circumference OPC is reduced by one step and the inner circumference OPC is reduced again. OPC may be performed. The deceleration need not always be one step. For example, the deceleration amount may be changed according to the difference between the optimum recording power obtained by the inner circumference OPC and a predetermined value.
[0126]
In the first embodiment, the case where the outer peripheral OPC is not completed normally and the linear velocity in the outer peripheral OPC is reduced by one stage and the outer peripheral OPC is executed again has been described. However, the present invention is not limited to this. For example, when the optimum recording power obtained by the outer peripheral OPC is equal to or more than a predetermined value, the linear velocity in the outer peripheral OPC may be reduced by one step, and the outer peripheral OPC may be executed again. Even if the outer circumference OPC is normally completed, if the optimum recording power obtained by the outer circumference OPC is equal to or more than a predetermined value, the linear velocity in the outer circumference OPC is reduced by one step, and the outer circumference OPC is executed again. May be. The deceleration need not always be one step. For example, the deceleration amount may be changed according to the difference between the optimum recording power obtained by the outer peripheral OPC and a predetermined value.
[0127]
Further, in the first embodiment, for example, when it is certain that the inner circumference OPC ends normally, it is not necessary to determine whether the inner circumference OPC ends normally (step 407 in FIG. 6). May be. That is, the process in step 407 may be skipped, and the process may immediately proceed to step 409 from step 405. As a result, the time required for the process of setting the recording conditions can be reduced.
[0128]
Similarly, in the first embodiment, when it is certain that the outer circumference OPC is normally completed, the determination as to whether the outer circumference OPC is normally completed (step 415 in FIG. 6) may be omitted. good. That is, the process in step 415 may be skipped, and the process may immediately proceed to step 417 from step 413. As a result, the time required for the process of setting the recording conditions can be reduced.
[0129]
In the first embodiment, the case where the optimum recording power at the recording linear velocity is obtained based on the results of the OPC at two locations has been described. However, the present invention is not limited to this. For example, the optimum recording power at the recording linear velocity may be obtained based only on the result of the inner circumference OPC. In this case, the average power Pavr is calculated based on the following equation (11) instead of the above equation (7). The pulse width correction value θvr is calculated based on the following equation (12) instead of the above equation (8). Here, k is a constant determined from past experience, experiments, theoretical calculations, and the like.
[0130]
Pavr = (Vr / Vi) × Pavi (11)
[0131]
θvr = (Vr−Vi) × k + θvi (12)
[0132]
Therefore, a case where the optimum recording power at the recording linear velocity Vr is obtained based on only the result of the inner circumference OPC will be described below with reference to the flowchart of FIG. The flowchart in FIG. 9 corresponds to a series of processing algorithms executed by the CPU 40.
[0133]
In steps 501 to 505 in FIG. 9, the same processing as steps 401 to 405 described above is performed.
[0134]
In the next step 507, it is determined whether or not the inner circumference OPC has been normally completed in the same manner as in step 407 described above.
[0135]
In step 509, the average power at the linear velocity Vi is calculated based on the result of the inner circumference OPC in the same manner as in step 417 described above.
[0136]
In the next step 511, the average power Pavr at the recording linear velocity Vr is calculated based on the above equation (11).
[0137]
In the next step 513, first, a pulse width correction value θvr at the recording linear velocity Vr is obtained based on the above equation (12). Then, the optimum recording power at the recording linear velocity Vr is calculated in the same manner as in step 423 described above.
[0138]
In steps 515, 517, 519, and 521, the same processes as those in steps 425, 427, 429, and 435 described above are performed.
[0139]
As a result, the time required for the process of setting the recording conditions can be reduced. Further, a trial writing area can be saved. Thus, for example, it may be determined whether or not to perform the outer circumference OPC according to the amount of data to be recorded. Alternatively, when the difference between the linear velocity at the inner circumference OPC and the recording linear velocity is smaller than a predetermined value, the outer circumference OPC may be omitted.
[0140]
Further, for example, when an effective result cannot be obtained by the outer circumference OPC, the optimum value at the recording linear velocity is determined based on the result of the inner circumference OPC by using the above equations (11) and (12). The recording power may be determined.
[0141]
Further, in the first embodiment, it is determined whether or not the optimum recording power at the calculated recording linear velocity is less than a predetermined value (step 427 in FIG. 6). The case where the system is set to the CLV system (step 429 in FIG. 6) has been described. For example, when it is certain that the calculated optimum recording power is less than the predetermined value, steps 427 and 429 in FIG. May be omitted.
[0142]
In the first embodiment, the case where the linear velocity Vo of the outer peripheral OPC is set to be equal to or higher than the recording linear velocity Vr has been described, but the present invention is not limited to this.
[0143]
In the first embodiment, the case where the linear velocity of the outer peripheral OPC is set according to the recording speed has been described. However, the present invention is not limited to this. For example, the outer peripheral OPC is performed at the linear velocity specified by the host 49. Is also good. Thus, for example, the user can select a linear velocity at which stable outer peripheral OPC can be performed for each type of information recording medium, and can reduce the time required to set optimal recording conditions.
[0144]
In the first embodiment, the first recording condition determination program is recorded on the ROM 39, but is recorded on another recording medium (CD-ROM, magneto-optical disk, flash memory, flexible disk, or the like). It may be. In this case, a drive device corresponding to each recording medium is added, and the first recording condition setting program is installed from each drive device. In short, the first recording condition setting program may be loaded into the main memory of the CPU 40.
[0145]
<< 2nd Embodiment >>
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.
[0146]
The second embodiment is characterized in that a process for setting an optimum recording condition is different from that of the first embodiment. The other configurations of the optical pickup device and the optical disk device are the same as those of the first embodiment. Therefore, the following description will focus on the differences from the first embodiment, and the same or equivalent components as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be simplified. Or, it shall be omitted. The prerequisites are the same as in the first embodiment.
[0147]
Therefore, a second recording condition setting program is stored in the ROM 39 instead of the first recording condition setting program.
[0148]
Here, a process for setting an optimum recording condition will be described with reference to FIG. The flowchart in FIG. 10 corresponds to a series of processing algorithms executed by the CPU 40. For example, when a recording request command is received from the host 49, the start address of the program corresponding to the flowchart of FIG. 10 is set in the program counter of the CPU 40, and the process for setting the optimum recording conditions starts.
[0149]
In a first step 601, a predetermined linear velocity Vi is set as a linear velocity (first linear velocity) when performing test writing (first test writing) in the inner PCA area. Further, a reference value Psi of the emission power of the semiconductor laser corresponding to the linear velocity Vi is also set.
[0150]
In the next step 603, the inner circumference OPC at the linear velocity Vi is executed using a predetermined partition (first test writing area) in the inner circumference PCA area. That is, predetermined test data is recorded in each frame of the partition while the emission power of the semiconductor laser is varied in a predetermined step with respect to the reference value Psi. Here, as an example, the fluctuation width of the light emission power is set to ± 25% of the reference value.
[0151]
In the next step 605, for example, the test-written data is reproduced, and the optimum recording power at the linear velocity Vi is determined based on the vertical symmetry and the amplitude of the reproduced signal, as in the related art. In the present embodiment, it is assumed that the optimum recording power Pwi has been obtained from the result of the inner circumference OPC.
[0152]
In the next step 607, the linear velocity Vr (> Vi), which is the same as the recording linear velocity in the present embodiment, is used as the linear velocity (second linear velocity) at the time of performing trial writing (second trial writing) in the outer PCA area. ) Is set.
[0153]
In the next step 609, a reference value (hereinafter also referred to as "reference power") of the emission power of the semiconductor laser at the linear velocity Vr is set based on the result of the inner circumference OPC. Here, the reference power Pop is obtained by using the following equation (13). At the same time, the pulse width correction value θvr is calculated using the following equation (14). Here, k ′ is a constant determined by past experience, experiments, theoretical calculations, and the like.
[0154]
Pop = (Vr / Vi) × Pwi (13)
[0155]
θvr = (Vr−Vi) × k ′ + θvi (14)
[0156]
The expressions (13) and (14) are merely examples, and the present invention is not limited thereto. For example, a polynomial obtained by performing statistical processing on various experimental results may be used.
[0157]
In the next step 611, the retry counter m is set to 1 and initialized.
[0158]
In the next step 613, outer circumference OPC (second test writing) at a linear velocity Vr is executed using a predetermined partition (second test writing area) in the outer PCA area. That is, predetermined test data is recorded in each frame of the partition while the emission power of the semiconductor laser is changed in a predetermined step with respect to the reference power Pop. Here, as an example, the fluctuation range of the light emission power is set to ± 5% of the reference power. That is, the variation step of the light emission power in the outer circumference OPC is set smaller than the variation step of the light emission power in the inner circumference OPC.
[0159]
In the next step 615, the optimum recording power at the linear velocity Vr is determined in the same manner as in the case of the inner circumference OPC. In this embodiment, it is assumed that the optimum recording power Pwr is obtained from the result of the outer circumference OPC.
[0160]
In the next step 617, it is determined whether or not the difference between the obtained optimum recording power Pwr and the reference power Pop is equal to or smaller than a predetermined value. Here, if the difference between the optimum recording power Pwo and the reference power Pop is not less than the predetermined value, the determination in step 617 is denied, and the process proceeds to step 619.
[0161]
In this step 619, the retry counter m is incremented (+1).
[0162]
In the next step 621, it is determined whether or not the retry counter m is equal to or less than a predetermined number of times. Here, if the retry counter m is equal to or less than the predetermined number, the determination in step 621 is affirmative, and the flow shifts to step 623.
[0163]
In this step 623, the linear velocity Vr of the outer peripheral OPC is reduced by one step to a new linear velocity Vr of the outer peripheral OPC. Then, the process returns to step 613 described above. The partition on which the trial writing is performed is set near the partition on which the trial writing was performed last time.
[0164]
If the retry counter m is not equal to or smaller than the predetermined number in step 621, the determination in step 621 is denied and the process returns to step 603. That is, it is determined that there is an abnormality in the result of the inner circumference OPC, and the inner circumference OPC is performed again.
[0165]
If it is determined in step 617 that the difference between the optimum recording power Pwr and the reference power Pop is equal to or smaller than a predetermined value, the determination in step 617 is affirmative, and the flow shifts to step 631.
[0166]
In this step 631, the optimum recording power Pwr is output to the power setting circuit 24c, and the pulse width correction value θvr is output to the pulse setting circuit 24b. As a result, recording conditions for recording information on the optical disk 15 at the linear velocity Vr are set.
[0167]
As is apparent from the above description, in the second embodiment, the first trial writing unit, the reference value acquiring unit, the second trial writing unit, the recording condition A setting unit and a recording unit are realized. That is, the first trial writing unit is executed by the processing of steps 601 to 605 in FIG. 10, the reference value acquiring unit is executed by the processing of steps 607 and 609, and the second trial writing unit is executed by the processing of steps 615 and 631 The recording condition setting means is respectively realized by the above processing. However, it goes without saying that the present invention is not limited to this. That is, the second embodiment is merely an example, and at least a part of each component realized by the processing according to the program by the CPU 40 may be configured by hardware, or all the components may be configured by hardware. It is good also as comprising.
[0168]
In the second embodiment, among the programs installed in the ROM 39, the second recording condition setting program is constituted by a program corresponding to the processing shown in the flowchart of FIG.
[0169]
Then, the first step of the recording condition setting method according to the present invention is performed by the processing of steps 601 to 605 of FIG. 10, the second step is performed by the processing of steps 607 and 609, and the processing of step 613 is performed. The third step is performed by the processing, and the fourth step is performed by the processing of steps 615 and 631.
[0170]
As described above, according to the optical disc device and the recording condition setting method according to the second embodiment, the inner circumference OPC is performed at the linear velocity Vi, and the linear velocity Vr (> The reference power Pop in the outer peripheral OPC in Vi) is obtained. Next, outer peripheral OPC at the linear velocity Vr is performed based on the reference power Pop. Then, the optimum recording power at the linear velocity Vr is determined based on the result of the outer circumference OPC, and the recording condition is determined based on the recording power. That is, since the reference power Pop at the linear velocity Vr is obtained based on the result of the test writing at the linear velocity Vi, the reference power Pop and the optimum recording power at the linear velocity Vr are very close values. It becomes. Therefore, the accuracy of the optimum recording power at the linear velocity Vr obtained from the result of the outer peripheral OPC is improved, and as a result, it is possible to set the optimum recording conditions for the high-speed recording.
[0171]
Further, according to the second embodiment, when the difference between the optimum recording power Pwo obtained in the outer peripheral OPC and the reference power Pop in the outer peripheral OPC is equal to or larger than a predetermined value, the value of the retry counter m is set to a predetermined value. If the value is equal to or less than the value, the outer peripheral OPC is executed again under the same condition. Thereby, for example, the influence of sudden noise can be removed.
[0172]
Further, according to the second embodiment, when the difference between the optimum recording power Pwo obtained in the outer peripheral OPC and the reference power Pop in the outer peripheral OPC is equal to or larger than a predetermined value, the value of the retry counter m is set to a predetermined value. When the value exceeds the value, the linear velocity in the outer peripheral OPC is reduced by one step, and the outer peripheral OPC is executed again. As a result, the reliability of the information obtained by the outer peripheral OPC can be improved, and as a result, the recording conditions can be accurately obtained.
[0173]
Further, according to the second embodiment, the fluctuation range of the light emission power of the semiconductor laser in the outer circumference OPC is set smaller than the fluctuation range of the light emission power of the semiconductor laser in the inner circumference OPC. This makes it possible to reduce the fluctuation amount of the light emission power in the outer peripheral OPC, so that the optimum recording power at the linear velocity Vr can be accurately obtained. That is, measurement accuracy can be improved.
[0174]
Further, according to the optical disk device of the second embodiment, it is possible to set optimum recording conditions for high-speed recording on the optical disk, and as a result, it is possible to stably perform recording with excellent recording quality at high speed. It is possible to do it.
[0175]
In the second embodiment, the second recording condition setting program is recorded on the ROM 39, but is recorded on another recording medium (CD-ROM, magneto-optical disk, flash memory, flexible disk, etc.). It may be. In this case, a drive device corresponding to each recording medium is added, and the second recording condition setting program is installed from each drive device. In short, it is sufficient that the second recording condition setting program is loaded into the main memory of the CPU 40.
[0176]
In the second embodiment, a case has been described where the linear velocity in the outer peripheral OPC and the recording linear velocity match, but the present invention is not limited to this. In this case, the optimum recording condition at the recording linear velocity is set based on the result of the inner circumference OPC and the result of the outer circumference OPC.
[0177]
In the second embodiment, the case where the fluctuation range of the emission power of the semiconductor laser in the outer circumference OPC is smaller than the fluctuation range of the emission power of the semiconductor laser in the inner circumference OPC is described. For example, they may be the same.
[0178]
In the second embodiment, the case where the number of frames used in the outer circumference OPC and the number of frames used in the inner circumference OPC are equal to each other is not limited to this. For example, the number of frames used in the outer circumference OPC is used. The number of frames may be smaller than the number of frames used in the inner circumference OPC. As a result, it is possible to reduce the time required for the process of setting the recording conditions, and it is possible to effectively use the test writing area.
[0179]
In the second embodiment, when the linear velocity of the outer peripheral OPC is equal to or higher than a predetermined linear velocity, the emission power of the semiconductor laser may be changed every two frames in the outer peripheral OPC area. As a result, in the outer peripheral OPC, the optimum recording power can be obtained with higher accuracy.
[0180]
In the second embodiment, the case where the recording condition is set when the difference between the optimum recording power obtained by the outer peripheral OPC and the reference power at that time is equal to or smaller than a predetermined value has been described. However, the recording condition may be set, for example, when the outer peripheral OPC is normally completed. This case will be described below with reference to the flowchart of FIG. The flowchart in FIG. 11 corresponds to a series of processing algorithms executed by the CPU 40. For example, when a recording request command is received from the host 49, the start address of the program corresponding to the flowchart of FIG. 11 is set in the program counter of the CPU 40, and the process starts.
[0181]
In the first step 701, the lead-in start time on the optical disc 15 is extracted from the ATIP information.
[0182]
In the next step 703, the vendor code of the optical disk 15 is acquired by referring to the correspondence table between the lead-in start time and the vendor code stored in the ROM 39 in advance.
[0183]
In the next steps 705 to 713, the same processing as in steps 601 to 609 described above is performed.
[0184]
In the next steps 715 and 717, the same processing as in the above steps 613 and 615 is performed.
[0185]
In the next step 719, it is determined whether or not the outer circumference OPC has been normally completed. Whether or not the outer periphery OPC has been completed normally is determined based on the vertical symmetry, amplitude, and the like of the reproduced signal. Alternatively, the determination may be made based on whether or not the optimum recording power has been obtained. Here, if the outer circumference OPC has been normally completed, the determination in step 719 is affirmed, and the process proceeds to step 721.
[0186]
In this step 721, the optimum recording power Pwr is output to the power setting circuit 24c, and the pulse width correction value θvr is output to the pulse setting circuit 24b. As a result, recording conditions for recording information on the optical disk 15 at the linear velocity Vr are set. Then, the processing for setting the recording conditions is terminated.
[0187]
On the other hand, if it is determined in step 719 that the outer periphery OPC has not been normally completed, the determination in step 719 is denied, and the process proceeds to step 723.
[0188]
In this step 723, the reference power Pop is output to the power setting circuit 24c, and the pulse width correction value θvr is output to the pulse setting circuit 24b. As a result, recording conditions for recording information on the optical disk 15 at the linear velocity Vr are set. Then, the processing for setting the recording conditions is terminated.
[0189]
As is apparent from the above description, in this case, the CPU 40 and the program executed by the CPU 40 implement the identification information acquisition unit.
[0190]
When the reference power Pop is output to the power setting circuit 24c, it is desirable to monitor the recording quality of the recorded data (hereinafter referred to as “immediately before recording data” for convenience) after the recording is completed. At this time, as shown in FIG. 12, instead of the reproduction signal processing circuit 28, a peak level detecting circuit 28i for detecting the peak level of the RF signal and a bottom level detecting circuit for detecting the bottom level of the RF signal are provided. The reproduction signal processing circuit 28 'to which the level detection circuit 28j is added is used. This recording quality monitoring process will be described below with reference to the flowchart of FIG. The flowchart in FIG. 13 corresponds to a series of processing algorithms executed by the CPU 40. For example, when the recording is completed, the head address of the program corresponding to the flowchart of FIG. 13 is set in the program counter of the CPU 40, and the recording quality monitoring process starts.
[0191]
In the first step 801, the motor driver 27 is instructed to rotate the optical disk 15 at a predetermined reproduction speed, and the seek motor is controlled so that the optical pickup device 23 is located at the head of the area where the immediately preceding recording data is recorded. To the motor driver 27.
[0192]
In the next step 803, the reproduction signal processing circuit 28 is instructed to check the recording quality. As a result, when the linear velocity of the optical disk 15 is stabilized, in the reproduction signal processing circuit 28, the RF signal detection circuit 28d detects the RF signal based on the output signal from the optical pickup device 23, and the peak level detection circuit 28e and the bottom signal are detected. The level detection circuit 28f acquires a peak level (Lp1) and a bottom level (Lb1) of the RF signal. Then, the peak level Lp1 and the bottom level Lb1 are output from the reproduction signal processing circuit 28 to the CPU 40.
[0193]
In the next step 805, the peak level Lp1 and the bottom level Lb1 are A / D-converted, and based on the following equation (15), a so-called β value serving as an index of the quality of the reproduced signal is calculated. Note that dLp1 and dLb1 in Expression (15) are values obtained by A / D conversion of the peak level Lp1 and the bottom level Lb1, respectively.
[0194]
β = (dLp1 + dLb1) / (dLp1-dLb1) (15)
[0195]
In the next step 807, it is determined whether the calculated β value satisfies a predetermined standard. Here, if the calculated β value does not satisfy the predetermined criterion, the determination in step 807 is denied, and the process proceeds to step 809.
[0196]
In this step 809, the vender code of the optical disc 15 and the vender code of the optical disc 15 are set in order to prohibit the recording on the optical disc 15 at the recording speed at which the immediately preceding recording data was recorded (hereinafter referred to as “the immediately preceding recording speed” for convenience). The recording prohibition information including the immediately preceding recording speed is recorded in a nonvolatile memory (not shown).
[0197]
In the next step 811, the host 49 is notified of error information indicating that good recording is impossible at the immediately preceding recording speed and information of the maximum recordable recording speed. Then, the recording quality monitoring process ends. As a result, the user can recognize that the predetermined recording quality cannot be obtained at that speed, and thereafter can request the recording at a lower recording speed. Therefore, the optical disk can be used effectively. Further, since the user can know the maximum recording speed on the optical disk of the vendor, the subsequent recording processing is smoothly performed.
[0198]
On the other hand, in step 807, if the calculated β value satisfies the predetermined criterion, the determination in step 807 is affirmed, and the recording quality monitoring process ends.
[0199]
Here, since the quality of the reproduced signal is determined using the β value calculated from the reproduced signal, the recording quality can be accurately determined. Further, since a new device for judging the recording quality is not required, it is possible to prevent an increase in cost.
[0200]
Note that the index of the quality of the reproduced signal is not limited to the β value. For example, the number of errors (C1 errors) at the time of C1 decoding and errors at the time of C2 decoding (C2 errors) in the CD decoder 28f is calculated. The number of such errors may be used as an index of the quality of the reproduced signal. Further, an error occurrence rate (error rate) calculated from the number of errors and the number of reproduced sectors may be used as an index of the quality of the reproduced signal. Of course, if the number of C1 errors and C2 errors is large, it is determined that the quality of the reproduced signal is poor. That is, since the recording quality is determined from the reproduced data itself, the recording quality can be accurately determined. Further, even in this case, a new device for judging the recording quality is not required, so that an increase in cost can be prevented.
[0201]
As is apparent from the above description, in this case, the CPU 40 and the program executed by the CPU 40 implement a quality acquisition unit, a determination unit, a recording prohibition unit, and an output unit.
[0202]
Further, by storing the recording prohibition information in a non-volatile memory (not shown), it is possible to determine whether recording at a specified recording speed is possible when a write request command is received from the host 49. . The processing in this case (hereinafter referred to as “recording permission / inhibition determination processing” for convenience) will be described below with reference to the flowchart in FIG. It is assumed that the vendor code of the optical disk 15 has already been obtained as described above. The flowchart in FIG. 14 corresponds to a series of processing algorithms executed by the CPU 40. For example, when a write request command is received from the host 49, the head address of the program corresponding to the flowchart of FIG. 14 is set in the program counter of the CPU 40 before the recording condition setting process, and the recording enable / disable determination process starts.
[0203]
In the first step 901, the recording speed specified by the host 49 is extracted. The recording speed is normally transmitted from the host 49 prior to the write request command.
[0204]
In the next step 903, it is determined whether or not recording at the specified recording speed on the optical disc 15 is possible with reference to the recording prohibition information stored in the non-volatile memory (not shown). That is, the recording inhibition information is searched using the vendor code of the optical disk 15 as a key, and the recording speed at which recording on the optical disk 15 is inhibited (inhibited recording speed) is extracted. Then, by comparing the extracted prohibited recording speed with the designated recording speed, it is determined whether or not the recording at the designated recording speed is possible. Here, if recording is not possible, the determination in step 903 is denied, and the process proceeds to step 905.
[0205]
In this step 905, recording at the designated recording speed is prohibited. Then, an error code indicating that recording at the specified recording speed is impossible is set, and the host 49 is notified together with the maximum recording speed at which recording is possible.
[0206]
In the next step 907, the maximum recordable recording speed is set to the recording speed, and the recording enable / disable determination process ends. In this case, an instruction from the host 49 is waited.
[0207]
On the other hand, if it is determined in step 905 that recording at the designated recording speed is possible, the recording permission / inhibition determination processing ends, and the flow shifts to recording processing.
[0208]
As described above, since the recording prohibition information including the vendor code and the prohibition recording speed is recorded in the non-volatile memory (not shown), the recording prohibition information is referred to when the recording request command is received, and the recording can be immediately performed. Can be determined. That is, by prohibiting recording at a recording speed that is expected to have poor recording quality based on past experience, it is possible to prevent the optical disk from being wasted.
[0209]
Further, in each of the above-described embodiments, the case where the test writing area is set on the outer peripheral side of the lead-out area and the outer peripheral OPC is performed using the area has been described. The outer periphery OPC may be performed using the outer periphery side, that is, an area close to the lead-in area.
[0210]
Further, in each of the above embodiments, the case where the optical disk is a CD-R has been described. However, the present invention is not limited to this, and may be any information recording medium that records information by pulsing a light source.
[0211]
In each of the above embodiments, the optical disk device capable of recording and reproducing information has been described. However, the present invention is not limited to this. good.
[0212]
In each of the above embodiments, the case where there is one light source has been described, but the present invention is not limited to this.
[0213]
【The invention's effect】
As described above, according to the recording condition setting method of the present invention, there is an effect that it is possible to set an optimum recording condition for high-speed recording on an information recording medium.
[0214]
Further, according to the program and the recording medium of the present invention, there is an effect that it is possible to set optimum recording conditions for high-speed recording on the information recording medium, which is executed by the control computer of the optical disk device. .
[0215]
Further, according to the optical disk device of the present invention, there is an effect that recording with excellent recording quality can be stably performed at a high speed.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an optical disc device according to a first embodiment of the present invention.
FIG. 2 is a block diagram for explaining a detailed configuration of an optical pickup device in FIG.
FIG. 3 is a block diagram for explaining a detailed configuration of a reproduction signal processing circuit in FIG. 1;
FIG. 4 is a block diagram for explaining a detailed configuration of a laser control circuit in FIG. 1;
FIG. 5 is a diagram for explaining a pulse width correction value.
FIG. 6 is a flowchart illustrating a recording condition setting process according to the first embodiment of the present invention.
FIG. 7 is a diagram for describing an inner OPC area and an outer OPC area;
FIGS. 8A and 8B are diagrams for explaining a method of calculating an average power and a pulse width correction value at a recording speed Vr from an inner circumference OPC result and an outer circumference OPC result, respectively. FIG.
FIG. 9 is a flowchart for explaining a case where an optimum recording power and a pulse width correction value at the recording speed Vr are calculated only from the result of the inner circumference OPC.
FIG. 10 is a flowchart illustrating a recording condition setting process according to a second embodiment of the present invention.
FIG. 11 is a flowchart for explaining a modification of the recording condition setting process according to the second embodiment of the present invention.
FIG. 12 is a block diagram illustrating a detailed configuration of a reproduction signal processing circuit used when monitoring recording quality.
FIG. 13 is a flowchart illustrating a process of monitoring recording quality.
FIG. 14 is a flowchart illustrating a process of determining whether or not recording is possible based on recording prohibition information.
[Explanation of symbols]
15 optical disk (information recording medium), 20 optical disk apparatus (optical disk apparatus), 39 ROM (recording medium), 40 CPU (test writing means, first average value calculating means, second average value calculating means, Recording condition setting means, recording means, first trial writing means, second trial writing means, identification information acquiring means, quality acquiring means, discriminating means, recording inhibiting means, output means).

Claims (29)

A recording condition setting method for setting recording conditions when recording information on an information recording medium having a spiral or concentric recording region by emitting a pulse of light from a light source,
A first step of performing test writing at a predetermined linear velocity on at least one test writing area provided on the information recording medium;
A second step of calculating an average value of the light emission power of the light source at the predetermined linear velocity based on a processing result in the first step;
A third step of calculating an average value of the light emission power of the light source at an arbitrary linear velocity based on the average value calculated in the second step;
A fourth step of obtaining an optimum recording power at the arbitrary linear velocity based on the average value calculated in the third step, and setting recording conditions at the arbitrary linear velocity based on the recording power; A recording condition setting method including: When the optimum recording power at the arbitrary linear velocity is equal to or higher than a predetermined value, the recording speed is substantially equal to the arbitrary linear velocity in the recording area on the outer peripheral side of the recording area recorded at the arbitrary linear velocity. The recording condition setting method according to claim 1, further comprising a fifth step of setting the same. The test writing area includes a first test writing area and a second test writing area,
In the first step, a first trial writing is performed at a first linear velocity in the first trial writing area, and a second linear velocity different from the first linear velocity is written in the second trial writing area. 3. The recording condition setting method according to claim 1, wherein a second trial writing is performed. In the second step, a first average value of the light emission power of the light source at the first linear velocity is calculated based on a result of the first test writing, and based on a result of the second test writing. Calculating a second average value of the light emission power of the light source at the second linear velocity;
4. The recording according to claim 3, wherein in the third step, an average value of light emission power at the arbitrary linear velocity is calculated based on the first average value and the second average value. 5. Condition setting method. 5. The recording condition setting method according to claim 3, wherein the second linear velocity is a linear velocity specified from outside. 6. The method according to claim 3, wherein one of the first linear velocity and the second linear velocity is equal to or higher than a linear velocity when information is recorded on the information recording medium. 7. The recording condition setting method described. A recording condition setting method for setting recording conditions when recording information on an information recording medium having a spiral or concentric recording region by emitting a pulse of light from a light source,
Performing first test writing at a first linear velocity at a plurality of positions in a first test writing area provided on the information recording medium while changing the light emission power of the light source with respect to a predetermined reference value; One step;
A second step of obtaining a reference value of the light emission power of the light source in test writing at a second linear velocity different from the first linear velocity based on a result of the first trial writing;
While varying the light emission power of the light source with respect to the reference value obtained in the second step, the light source is moved at the second linear velocity at a plurality of positions in a second test writing area provided on the information recording medium. A third step of performing a trial writing of 2;
A fourth step of obtaining an optimum recording power at the second linear velocity based on a result of the second test writing, and setting the recording condition based on the recording power. . 8. The recording condition setting method according to claim 7, wherein a fluctuation width of the light emission power in the second test writing is smaller than a fluctuation width of the light emission power in the first test writing. 9. The recording condition setting method according to claim 7, wherein the number of changes in the light emission power in the second test writing is smaller than the number of changes in the light emission power in the first test writing. 10. 10. The apparatus according to claim 3, wherein the second test writing area is located on an outer peripheral side of the first test writing area, and the second linear velocity is higher than the first linear velocity. The recording condition setting method according to any one of the above. The first test writing area is located on an inner peripheral side of a data area where information is recorded on the information recording medium, and the second test writing area is located on an outer peripheral side of the data area. The recording condition setting method according to claim 3, wherein: A program used in an optical disc device that records information in a spiral or concentric recording area of an information recording medium by emitting a pulse of light from a light source,
A first procedure of performing test writing at a predetermined linear velocity on at least one test writing area provided on the information recording medium;
A second procedure of calculating an average value of the light emission power of the light source at the predetermined linear velocity based on the processing result in the first procedure;
A third step of calculating an average value of the light emission power of the light source at an arbitrary linear velocity based on the average value calculated in the second step;
A fourth procedure for obtaining an optimum recording power at the arbitrary linear velocity based on the average value calculated in the third procedure. When the optimum recording power at the arbitrary linear velocity is equal to or higher than a predetermined value, the recording speed is substantially equal to the arbitrary linear velocity in the recording area on the outer peripheral side of the recording area recorded at the arbitrary linear velocity. 13. The program according to claim 12, further causing the control computer to execute a fifth procedure of setting the same. The test writing area includes a first test writing area and a second test writing area,
As the first procedure, a first trial writing is performed at a first linear velocity in the first trial writing area, and a second linear velocity different from the first linear velocity is written in the second trial writing area. 14. The program according to claim 12, wherein the control computer causes the control computer to execute a procedure of performing the second trial writing. As the second procedure, a first average value of the light emission power of the light source at the first linear velocity is calculated based on the result of the first test writing, and based on the result of the second test writing. Calculating a second average value of the light emission power of the light source at the second linear velocity;
Causing the control computer to execute a procedure of calculating an average value of the light emission power at the arbitrary linear velocity based on the first average value and the second average value as the third procedure. The program according to claim 14, characterized by: 16. The program according to claim 14, wherein the second linear velocity is a linear velocity specified externally. 17. The method according to claim 14, wherein one of the first linear velocity and the second linear velocity is equal to or higher than a linear velocity when information is recorded on the information recording medium. The program described. A program used in an optical disc device that records information in a spiral or concentric recording area of an information recording medium by emitting a pulse of light from a light source,
Performing first test writing at a first linear velocity at a plurality of positions in a first test writing area provided on the information recording medium while changing the light emission power of the light source with respect to a predetermined reference value; 1 procedure;
A second procedure for obtaining a reference value of the light emission power of the light source in test writing at a second linear velocity different from the first linear velocity based on the result of the first test writing; While varying the power with respect to the reference value obtained in the second procedure, a second test is performed at a plurality of positions in a second test writing area provided on the information recording medium at the second linear velocity. A third step of writing;
A fourth procedure for obtaining an optimum recording power at the second linear velocity based on a result of the second test writing; and a computer for controlling the optical disc apparatus. 19. The program according to claim 18, wherein the fluctuation width of the light emission power in the second test writing is smaller than the fluctuation width of the light emission power in the first test writing. 20. The program according to claim 18, wherein the number of times the light emission power fluctuates in the second test writing is smaller than the number of times the light emission power fluctuates in the first test writing. 21. The second test writing area is located on the outer peripheral side of the first test writing area, and the second linear velocity is higher than the first linear velocity. The program according to any one of the above. The first test writing area is located on an inner peripheral side of a data area where information is recorded on the information recording medium, and the second test writing area is located on an outer peripheral side of the data area. The program according to any one of claims 14 to 21, characterized in that: A computer-readable recording medium on which the program according to any one of claims 12 to 22 is recorded. An optical disc device for recording information in a spiral or concentric recording area of an information recording medium by emitting a pulse of light from a light source,
Test writing means for performing test writing at a predetermined linear velocity on at least one test writing area provided on the information recording medium;
First average value calculation means for calculating an average value of the light emission power of the light source at the predetermined linear velocity based on a result of the test writing means;
A second average value calculation unit that calculates an average value of the light emission power of the light source at a recording speed when information is recorded on the information recording medium, based on the average value calculated by the first average value calculation unit. When;
Recording condition setting means for obtaining an optimum recording power at the recording speed based on the average value calculated by the second average value calculating means, and setting recording conditions at the recording speed based on the recording power; When;
Recording means for recording information on the information recording medium based on the recording conditions. An optical disc device for recording information in a spiral or concentric recording area of an information recording medium by emitting a pulse of light from a light source,
Performing first test writing at a first linear velocity at a plurality of positions in a first test writing area provided on the information recording medium while changing the light emission power of the light source with respect to a predetermined reference value; 1 trial writing means;
Reference value acquisition means for obtaining a reference value of the light emission power of the light source in test writing at a second linear velocity different from the first linear velocity based on a result of the first trial writing;
While changing the light emission power of the light source with respect to the reference value obtained by the reference value obtaining means, the light source is driven at the second linear velocity at a plurality of positions in a second test writing area provided on the information recording medium. A second trial writing means for performing a second trial writing;
Recording that sets an optimum recording power at the second linear velocity based on a result of the second test writing and sets recording conditions when recording information on the information recording medium based on the recording power. Condition setting means;
Recording means for recording information on the information recording medium based on the recording conditions. Identification information acquisition means for acquiring identification information of the information recording medium;
Quality acquisition means for reproducing at least a part of a recording area in which the information is recorded after recording by the recording means, and acquiring an index indicating the quality of the reproduced signal;
Determining means for determining whether or not the quality of the reproduced signal satisfies a predetermined criterion based on the index obtained by the quality obtaining means;
Recording inhibiting means for inhibiting recording at the recording speed on the information recording medium having the identification information when the quality of the reproduction signal does not satisfy a predetermined criterion as a result of the determination. 26. The optical disk device according to claim 25, wherein: 27. The optical disc apparatus according to claim 26, wherein the index includes a value calculated by (dLp + dLb) / (dLp-dLb) using a peak level dLp and a bottom level dLb of the reproduction signal. 27. The optical disc apparatus according to claim 26, wherein the index includes at least one of an error occurrence number and an error occurrence rate detected when decoding the reproduction signal. Output means for outputting at least one of record disable information indicating that recording at a specified recording speed is impossible and a maximum recordable speed to an external device when the recording is prohibited by the record prohibiting means; The optical disk device according to any one of claims 26 to 28, further comprising:

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