JP2007323764A - Optical disk device - Google Patents

Optical disk device Download PDF

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JP2007323764A
JP2007323764A JP2006154744A JP2006154744A JP2007323764A JP 2007323764 A JP2007323764 A JP 2007323764A JP 2006154744 A JP2006154744 A JP 2006154744A JP 2006154744 A JP2006154744 A JP 2006154744A JP 2007323764 A JP2007323764 A JP 2007323764A
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recording
optimum
optical disc
power
speed
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Hidemitsu Nanbu
秀充 南部
Kiyoshi Fukuchi
潔 福地
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Teac Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device capable of more accurately providing optimal recording power corresponding to a recording speed. <P>SOLUTION: The optical disk device records data at a different recording speed corresponding to the radial position of an optical disk 10, wherein a control section 24 sets first optimal recording power at the recording speed of a test recording area by trial writing in the inner circumferential side test recording area of the optical disk, and calculates optimal recording power at the recording speed of the data recording area of the optical disk 10 from the first optimal recording power by using a correlation coefficient defining a relationship between optimal recording power at the recording speed of the inner circumferential side test recording area of the specific optical disk and optimal recording power at the recording speed of the outer circumferential side data recording area in the specific optical disk device. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、光ディスクに情報を記録・再生する光ディスク装置において記録用光ディスクの記録用レーザパワーの制御処理の技術に関する。   The present invention relates to a technique for controlling a recording laser power of a recording optical disc in an optical disc apparatus for recording / reproducing information on an optical disc.

従来より、ＤＶＤ−Ｒなどの記録可能な光ディスク装置ではＯＰＣ（Optimum Power Control）と称される最適記録パワーを求める処理が実行される。最適記録パワーを求める方法として、ＰＣＡまたはＤＲＩＶＥ ＴＥＳＴ ＺＯＮＥと呼ばれる、実データが書き込まれるデータ記録エリアよりディスク内周側に形成されるテスト記録エリア（以下、内周テスト記録エリアと称す）において、所定のデータを書き込む試し記録を行うことにより最適記録パワーを求める方法が知られている。例えば、Ｚｏｎｅ−ＣＬＶ方式やＣＡＶ方式のようにディスク外周に向かって記録速度を早めて記録を行う場合には、各々の記録速度に応じて最適記録パワーを求める必要がある。そこで、例えば、内周テスト記録エリアにおいてＯＰＣを実行することで求められた最適記録パワーに、所定の係数を掛けて、ＯＰＣを実行しないゾーンでの最適記録パワーを求める方法が知られている。   Conventionally, in a recordable optical disc apparatus such as a DVD-R, a process for obtaining optimum recording power called OPC (Optimum Power Control) is executed. As a method for obtaining the optimum recording power, a predetermined test recording area called PCA or DRIVE TEST ZONE, which is formed on the inner circumference side of the disc from the data recording area in which actual data is written (hereinafter referred to as inner circumference test recording area), is predetermined. There is known a method for obtaining the optimum recording power by performing trial recording for writing the data. For example, when recording is performed by increasing the recording speed toward the outer periphery of the disk as in the Zone-CLV system or the CAV system, it is necessary to obtain the optimum recording power according to each recording speed. Therefore, for example, a method is known in which the optimum recording power obtained by executing OPC in the inner periphery test recording area is multiplied by a predetermined coefficient to obtain the optimum recording power in a zone in which OPC is not executed.

特許文献１には、２つの記録速度でＯＰＣを実施し、記録速度の変化に対して、最適記録パワーの変化量の関係を取得し、所定の係数に対して求まった記録パワーに対して、前述の変化量の関係を利用して、補正を加えることにより、温度環境やディスクのばらつきの影響を回避し、ＯＰＣを実行しないゾーンでの最適記録パワーのズレを補正する方法が開示されている。   In Patent Document 1, OPC is performed at two recording speeds, the relationship of the amount of change in the optimum recording power with respect to the change in recording speed is acquired, and the recording power obtained with respect to a predetermined coefficient is obtained. There is disclosed a method of correcting the deviation of the optimum recording power in a zone where OPC is not executed by applying the correction by utilizing the relationship of the above-described change amount, thereby avoiding the influence of temperature environment and disc variation. .

しかし、内周側の記録速度と外周側の記録速度との差が大きくなるにつれて、所定の係数の値は大きくなる。よって、例えば内周テスト記録エリアから求められた最適記録パワーの誤差が大きいと、所定の係数に基づいて求められる外周側の最適記録パワーの誤差も大きくなる。また、光ピックアップ（ＯＰＵ）のレーザダイオード波長やディスク面に対する光軸の傾角がディスク装置ごとに異なると、ディスク装置間で所定の係数の互換性が得られない場合がある。   However, as the difference between the recording speed on the inner peripheral side and the recording speed on the outer peripheral side increases, the value of the predetermined coefficient increases. Therefore, for example, if the error in the optimum recording power obtained from the inner circumference test recording area is large, the error in the optimum recording power on the outer circumference side obtained based on the predetermined coefficient also increases. Further, when the laser diode wavelength of the optical pickup (OPU) and the tilt angle of the optical axis with respect to the disk surface are different for each disk device, compatibility of predetermined coefficients may not be obtained between the disk devices.

そこで、内周テスト記録エリアから求められた最適記録パワーより間接的に外周側のデータ記録エリアに対する最適記録パワーを求めるのではなく、データ記録エリアより外周側に形成された外周テスト記録エリアにおいて所定のデータを書き込む試し記録を行い、外周側の最適記録パワーを求める方法も考えられる。この方法では、データ記録エリアより外周側に形成されたテスト記録エリアから外周側の最適記録パワーを求めるため、外周側の実際の記録速度に近い速度で試し記録を行うことができる。よって、外周側の最適記録パワーを精度よく求められることが予想される。しかしながら、一般的に、市販されているディスクの場合、外周テスト記録エリアはディスクの最外周エリアに形成されており、最外周エリアにおけるチルトや面振れ、偏重心、偏心などの機械特性は良好でなく、色素むらなどもあるため、外周テスト記録エリアから求められる最適記録パワーの精度は期待できない場合が多い。また、実際のデータ記録を開始する前にその都度、内周テスト記録エリアおよび外周テスト記録エリアにおいて個別に試し記録を行い最適記録パワーを求める場合、最適記録パワーを求めるまでに比較的多くの時間を要し、実際の記録を開始するまでの時間が長くなってしまう。   Therefore, instead of obtaining the optimum recording power for the data recording area on the outer circumference side indirectly from the optimum recording power obtained from the inner circumference test recording area, it is determined in the outer circumference test recording area formed on the outer circumference side from the data recording area. A method is also conceivable in which trial recording is performed to write the data and the optimum recording power on the outer peripheral side is obtained. In this method, since the optimum recording power on the outer peripheral side is obtained from the test recording area formed on the outer peripheral side from the data recording area, trial recording can be performed at a speed close to the actual recording speed on the outer peripheral side. Therefore, it is expected that the optimum recording power on the outer peripheral side can be obtained with high accuracy. However, generally, in the case of commercially available discs, the outer peripheral test recording area is formed in the outermost peripheral area of the disc, and mechanical properties such as tilt, runout, eccentric gravity center, and eccentricity in the outermost peripheral area are good. In addition, since there is dye unevenness, the accuracy of the optimum recording power required from the outer periphery test recording area cannot be expected in many cases. In addition, when the optimum recording power is obtained by performing individual test recording in the inner circumference test recording area and the outer circumference test recording area each time before actual data recording is started, it takes a relatively long time to obtain the optimum recording power. And it takes a long time to start actual recording.

特開２００５−３１７０６４号公報JP 2005-317064 A

本発明は、より精度よく記録速度に応じた最適記録パワーを求めることが可能な光ディスク装置を提供することを目的とする。   An object of the present invention is to provide an optical disc apparatus capable of obtaining an optimum recording power according to a recording speed with higher accuracy.

本発明に係る光ディスク装置は、光ディスクに設けられたデータ記録エリアに、記録速度に応じた最適記録パワーのレーザ光を照射することでデータ記録を行う光ディスク装置において、特定光ディスク装置が、光ディスクに設けられたデータ記録エリアより内周側の内周テスト記録エリアに第１記録速度で試し記録を行うことにより求められた第１記録速度に対する第１最適記録パワーと、前記特定光ディスク装置が、前記データ記録エリアに前記第１記録速度とは異なる第２記録速度で試し記録を行うことにより求められた第２記録速度に対する第２最適記録パワーとに基づき定められた係数を記憶するメモリと、光ディスクに設けられた内周テスト記録エリアに前記第１記録速度で試し記録を行うことにより前記第１記録速度に対する第３最適記録パワーを求め、前記メモリに記録された係数と前記第３最適記録パワーとに基づき、前記データ記録エリアにおける前記第２記録速度に対する第４最適記録パワーを求める最適記録パワー決定部と、を備えることを特徴とする。   An optical disc apparatus according to the present invention is an optical disc apparatus that performs data recording by irradiating a data recording area provided on the optical disc with laser light having an optimum recording power according to the recording speed. The specific optical disc apparatus is provided on the optical disc. A first optimum recording power with respect to a first recording speed obtained by performing test recording at a first recording speed in an inner peripheral test recording area on the inner peripheral side of the data recording area, and the specific optical disc apparatus includes the data A memory for storing a coefficient determined based on a second optimum recording power for a second recording speed obtained by performing trial recording at a second recording speed different from the first recording speed in a recording area; By performing test recording at the first recording speed in the provided inner periphery test recording area, An optimum recording power determination unit that obtains a third optimum recording power and obtains a fourth optimum recording power for the second recording speed in the data recording area based on the coefficient recorded in the memory and the third optimum recording power; It is characterized by providing.

本発明に係る光ディスク装置の１つの態様では、前記光ディスクのデータ記録エリアに前記第２記録速度で試し記録を行うことにより前記第２記録速度に対する第５最適記録パワーを求め、前記第４最適記録パワーと前記第５最適記録パワーとに基づき、前記係数を補正するための補正値を求め、前記係数に対応付けて前記補正値を前記メモリに登録する補正値登録部を備え、前記最適記録パワー決定部は、前記補正値に基づき前記係数を補正し、補正された係数と前記第３最適記録パワーとに基づき前記第４最適記録パワーを求めることを特徴とする。   In one aspect of the optical disc apparatus according to the present invention, the fifth optimum recording power for the second recording speed is obtained by performing trial recording at the second recording speed in the data recording area of the optical disc, and the fourth optimum recording is performed. A correction value registration unit that obtains a correction value for correcting the coefficient based on power and the fifth optimum recording power and registers the correction value in the memory in association with the coefficient; The determining unit corrects the coefficient based on the correction value, and obtains the fourth optimum recording power based on the corrected coefficient and the third optimum recording power.

本発明に係る光ディスク装置の１つの態様では、前記補正値登録部は、前記第４最適記録パワーと前記第５最適記録パワーとの類似度が所定の基準値より低い場合に、前記補正値を求めて前記メモリに登録することを特徴とする。   In one aspect of the optical disc apparatus according to the present invention, the correction value registration unit sets the correction value when the similarity between the fourth optimum recording power and the fifth optimum recording power is lower than a predetermined reference value. It is obtained and registered in the memory.

本発明に係る光ディスク装置は、光ディスクの半径位置に応じて異なる記録速度でデータを記録する光ディスク装置であって、光ディスクの内周側テスト記録エリアで試し書きすることにより該テスト記録エリアの記録速度での第１最適記録パワーを設定する手段と、特定光ディスク装置における、特定光ディスクの内周側テスト記録エリアの記録速度における最適記録パワーと外周側データ記録エリアの記録速度における最適記録パワーとの関係を規定する相関係数を用いて、前記第１最適記録パワーから前記光ディスクのデータ記録エリアの記録速度における最適記録パワーを演算する手段と、を有することを特徴とする。   An optical disk apparatus according to the present invention is an optical disk apparatus that records data at different recording speeds according to the radial position of the optical disk, and performs test writing in the test recording area on the inner circumference side of the optical disk, thereby recording the recording speed of the test recording area. Between the optimum recording power at the recording speed of the inner peripheral side test recording area of the specific optical disc and the optimum recording power at the recording speed of the outer data recording area in the specific optical disc apparatus Means for calculating an optimum recording power at a recording speed in a data recording area of the optical disc from the first optimum recording power using a correlation coefficient that defines

本発明に係る光ディスク装置の１つの態様では、前記相関係数は、前記内周側テスト記録エリアの記録速度における最適記録パワーに対する前記外周側データ記録エリアの記録速度における最適記録パワーの比であることを特徴とする。   In one aspect of the optical disc apparatus according to the present invention, the correlation coefficient is a ratio of the optimum recording power at the recording speed of the outer circumference side data recording area to the optimum recording power at the recording speed of the inner circumference side test recording area. It is characterized by that.

本発明に係る光ディスク装置の１つの態様では、前記光ディスクのデータ記録エリアで試し書きすることにより前記特定光ディスク装置における前記相関係数を増減調整する手段と、を有することを特徴とする。   One aspect of the optical disk apparatus according to the present invention is characterized by comprising means for increasing or decreasing the correlation coefficient in the specific optical disk apparatus by performing trial writing in the data recording area of the optical disk.

本発明によれば、より精度よく記録速度に応じた最適記録パワーを求めることが可能な光ディスク装置を提供することができる。   According to the present invention, it is possible to provide an optical disc apparatus capable of obtaining the optimum recording power corresponding to the recording speed with higher accuracy.

本発明を実施するための最良の形態（以下、実施形態と称す）について、以下図面を用いて説明する。   The best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described below with reference to the drawings.

図１には、本実施形態に係る光ディスク装置の要部構成ブロック図が示されている。光ディスク１０は、スピンドルモータ１２によりＣＡＶ方式あるいはＺｏｎｅ−ＣＬＶ方式で制御される。   FIG. 1 shows a block diagram of a main part of the optical disc apparatus according to the present embodiment. The optical disk 10 is controlled by the spindle motor 12 by the CAV method or the Zone-CLV method.

光ピックアップ部１４は光ディスク１０に対向して設けられ、レーザダイオード（ＬＤ）から記録パワーのレーザ光を射出して光ディスク１０にデータを記録する。データの記録は、光ディスク１０の記録膜の一部を溶融昇華してピットを形成してもよく、結晶状態を加熱急冷してアモルファス状態に遷移させることで行ってもよい。   The optical pickup unit 14 is provided facing the optical disc 10 and records data on the optical disc 10 by emitting laser light having a recording power from a laser diode (LD). Data recording may be performed by melting and sublimating a part of the recording film of the optical disc 10 to form pits, or by heating and quenching the crystalline state to transition to the amorphous state.

データ記録時には、記録データがエンコーダ１８に供給され、エンコーダ１８にてエンコードされたデータがＬＤ駆動部１６に供給される。ＬＤ駆動部１６は、エンコードされたデータに基づき駆動信号を作成し、光ピックアップ部１４のＬＤに供給する。また、ＬＤ駆動部１６には、制御部２４からの制御信号が供給され、この制御信号により記録ストラテジ並びに記録パワーが決定される。   At the time of data recording, the recording data is supplied to the encoder 18, and the data encoded by the encoder 18 is supplied to the LD driving unit 16. The LD drive unit 16 creates a drive signal based on the encoded data and supplies it to the LD of the optical pickup unit 14. The LD driving unit 16 is supplied with a control signal from the control unit 24, and the recording strategy and the recording power are determined by the control signal.

一方、データ再生時には、光ピックアップ部１４は、ＬＤから再生パワー（再生パワー＜記録パワー）のレーザ光を照射し、その反射光を受光して電気信号に変換し再生ＲＦ信号を得る。再生ＲＦ信号は再生ＲＦ信号処理部２０に供給される。   On the other hand, at the time of data reproduction, the optical pickup unit 14 irradiates a laser beam with reproduction power (reproduction power <recording power) from the LD, receives the reflected light and converts it into an electrical signal to obtain a reproduction RF signal. The reproduction RF signal is supplied to the reproduction RF signal processing unit 20.

ＲＦ信号処理部２０は、増幅アンプやイコライザ、二値化部、ＰＬＬ部などを有し、再生ＲＦ信号を二値化し、さらに同期クロックを生成してデコーダ２２に供給する。デコーダ２２は、供給されたこれらの信号に基づきデータをデコードし、再生データとして出力する。   The RF signal processing unit 20 includes an amplification amplifier, an equalizer, a binarization unit, a PLL unit, and the like, binarizes the reproduced RF signal, generates a synchronization clock, and supplies it to the decoder 22. The decoder 22 decodes data based on these supplied signals and outputs it as reproduced data.

また、ＲＦ信号処理部２０からの再生ＲＦ信号は、信号品質評価用に制御部２４にも供給される。なお、データ再生時には、この他にトラッキングエラー信号やフォーカスエラー信号を生成してフォーカスサーボあるいはトラッキングサーボを制御する回路、光ディスク１０に形成されたウォブル信号を再生してアドレス復調あるいは回転数制御に用いる回路もあるが、これらについては従来技術と同様であるのでその説明は省略する。   The reproduced RF signal from the RF signal processing unit 20 is also supplied to the control unit 24 for signal quality evaluation. At the time of data reproduction, a tracking error signal or a focus error signal is also generated to control the focus servo or tracking servo, and a wobble signal formed on the optical disk 10 is reproduced and used for address demodulation or rotation speed control. There are also circuits, but these are the same as in the prior art, so the description thereof is omitted.

制御部２４は、実際のデータ記録に先立ってＬＤ駆動部１６を駆動して記録速度に応じた記録パワーの最適化（ＯＰＣ）を実行する。ＯＰＣは、例えば記録パワーを１５フレームにおいて１５段階に変化させて所定のエリアにテストデータを記録し、各テストデータを再生してそのβ値を検出することで行われる。記録パワーごとのβ値を算出した後、制御部２４は記録パワーの関数としてβ値を順次記録し、予め定められた基準β値が得られる記録パワーを最適記録パワーとして選択する。   Prior to actual data recording, the control unit 24 drives the LD driving unit 16 to perform recording power optimization (OPC) according to the recording speed. OPC is performed, for example, by changing the recording power in 15 steps in 15 frames, recording test data in a predetermined area, reproducing each test data, and detecting its β value. After calculating the β value for each recording power, the control unit 24 sequentially records the β value as a function of the recording power, and selects the recording power at which a predetermined reference β value is obtained as the optimum recording power.

ここで、制御部２４は、Ｚｏｎｅ−ＣＬＶ方式やＣＡＶ方式のようにディスク外周に向かって記録速度を早めてデータ記録を行う場合、内周テスト記録エリアにおいて、比較的低速の内周記録速度に対する内周最適記録パワーを求めた後、内周記録速度より高速な外周記録速度に対する外周最適記録パワーを内周最適記録パワーに対して所定の係数に基づく演算を行うことで間接的に求めるが、本実施形態では、この所定の係数に対して光ディスク装置ごとに定めた補正値を用いて補正を行い、内周最適記録パワーに対して補正済みの係数に基づく演算を行うことで外周最適記録パワーを求める。   Here, when the data recording is performed by increasing the recording speed toward the outer periphery of the disc as in the Zone-CLV method or the CAV method, the control unit 24 performs a relatively low inner peripheral recording speed in the inner peripheral test recording area. After obtaining the inner circumference optimum recording power, the outer circumference optimum recording power for the outer circumference recording speed higher than the inner circumference recording speed is obtained indirectly by performing calculation based on a predetermined coefficient for the inner circumference optimum recording power, In this embodiment, the predetermined optimum coefficient is corrected using a correction value determined for each optical disc apparatus, and the calculation based on the corrected coefficient is performed on the innermost optimum recording power, so that the outermost optimum recording power is obtained. Ask for.

以下、補正値の求め方について順を追って説明する。   Hereinafter, the method for obtaining the correction value will be described in order.

まず、光ディスク装置の製造時にデータ記録やデータ再生などの機能の精度が保証された特定の光ディスク装置（以下、基準ドライブと称す）において、図２に示すフローチャートに基づく処理を実行する。   First, processing based on the flowchart shown in FIG. 2 is executed in a specific optical disk apparatus (hereinafter referred to as a reference drive) in which accuracy of functions such as data recording and data reproduction is guaranteed at the time of manufacturing the optical disk apparatus.

図２において、基準ドライブの制御部２４は、光ディスク１０の最内周に設けられた内周テスト記録エリアにおいて内周記録速度でＯＰＣを実行し、基準ドライブにおける内周最適記録パワーＰｂｉを求める（Ｓ１００）。なお、ここで用いられる光ディスク１０は、複数メーカーの複数の機種において安定的な記録品質が予め保証されている特定ディスク、例えば、光ディスク装置の性能検査等を行う際に用いられる業界標準のいわゆる標準ディスクであることが好ましい。次いで、実データが記録される所定のデータ記録エリア（例えばデータ記録エリアを複数のゾーンに区切る場合、最外周のゾーンに対応するデータ記録エリア）において、内周記録速度より高倍速である外周記録速度でＯＰＣを実行し、基準ドライブにおける外周最適記録パワーＰｂｏを求める（Ｓ１０２）。次いで、制御部２４は、外周最適記録パワーＰｂｏを内周最適記録パワーＰｂｉで除算することで、外周記録速度の基準比率係数Ｋｂｏを求める（Ｓ１０４）。つまり、制御部２４は、Ｋｂｏ＝Ｐｂｏ／Ｐｂｉという式に基づいてＫｂｏを求める。   In FIG. 2, the control unit 24 of the reference drive executes OPC at the inner periphery recording speed in the inner periphery test recording area provided on the innermost periphery of the optical disc 10 to obtain the inner periphery optimum recording power Pbi in the reference drive ( S100). Note that the optical disk 10 used here is a so-called standard of an industry standard used when performing performance inspection of a specific disk, for example, an optical disk device, for which stable recording quality is guaranteed in advance in a plurality of models of a plurality of manufacturers. A disk is preferred. Next, in a predetermined data recording area in which actual data is recorded (for example, when the data recording area is divided into a plurality of zones, the data recording area corresponding to the outermost zone), the outer circumference recording is higher in speed than the inner circumference recording speed. OPC is executed at the speed to obtain the optimum outer peripheral recording power Pbo in the reference drive (S102). Next, the control unit 24 obtains the reference ratio coefficient Kbo of the outer peripheral recording speed by dividing the outer peripheral optimal recording power Pbo by the inner peripheral optimal recording power Pbi (S104). That is, the control unit 24 obtains Kbo based on the equation Kbo = Pbo / Pbi.

本実施形態では、上記のように求めた基準比率係数Ｋｂｏをファームウェアとして管理し、製造される各光ディスク装置のメモリ（例えばＥＥＰＲＯＭ）２６に予め登録しておく。   In the present embodiment, the reference ratio coefficient Kbo obtained as described above is managed as firmware and registered in advance in a memory (for example, EEPROM) 26 of each manufactured optical disc apparatus.

続いて、基準ドライブ以外のドライブ（以下、対象ドライブと称す）である光ディスク装置に対する外周記録速度の補正値ρｏの求め方について、図３に示すフローチャートを用いて説明する。   Next, a method of obtaining the outer peripheral recording speed correction value ρo for an optical disc apparatus that is a drive other than the reference drive (hereinafter referred to as a target drive) will be described with reference to the flowchart shown in FIG.

図３において、対象ドライブの制御部２４は、光ディスク１０の最内周のテスト記録エリアにおいて内周記録速度のＯＰＣを実行し、対象ドライブにおける内周最適記録パワーＰｔｉを求める（Ｓ２００）。次いで、制御部２４はメモリ２６に登録された外周記録速度の基準比率係数Ｋｂｏを読み出し、内周最適記録パワーＰｔｉに基準比率係数Ｋｂｏを乗算することで、対象ドライブにおける外周記録速度に対する第１の最適記録パワーＰｔｏ１を求める（Ｓ２０２）。つまり、制御部２４は、Ｐｔｏ１＝Ｋｂｏ×Ｐｔｉという式に基づいて第１の最適記録パワーＰｔｏ１を求める。これにより、対象ドライブにおける外周記録速度に対する最適記録パワーを求めることができる。しかし、ここで求めた第１の最適記録パワーＰｔｏ１により外周記録速度でのデータ記録を行うと、光ディスク装置によっては、光ピックアップ部１４のレーザダイオード波長やディスク面に対する光軸の傾角などの違いにより、基準ドライブとの環境が異なってしまい、基準比率係数Ｋｂｏの互換性が得られておらず、実際にはβ値が基準β値を満足しない場合がある。   In FIG. 3, the control unit 24 of the target drive executes OPC of the inner peripheral recording speed in the innermost test recording area of the optical disc 10 to obtain the inner peripheral optimum recording power Pti in the target drive (S200). Next, the control unit 24 reads the reference ratio coefficient Kbo of the outer peripheral recording speed registered in the memory 26, and multiplies the inner peripheral optimum recording power Pti by the reference ratio coefficient Kbo, so that the first outer recording speed for the target drive is increased. The optimum recording power Pto1 is obtained (S202). That is, the control unit 24 obtains the first optimum recording power Pto1 based on the expression Pto1 = Kbo × Pti. Thereby, the optimum recording power with respect to the outer peripheral recording speed in the target drive can be obtained. However, when data recording is performed at the outer peripheral recording speed with the first optimum recording power Pto1 obtained here, depending on the optical disk device, the difference in the laser diode wavelength of the optical pickup unit 14, the tilt angle of the optical axis with respect to the disk surface, or the like. The environment of the reference drive is different, the compatibility of the reference ratio coefficient Kbo is not obtained, and the β value may not actually satisfy the reference β value.

そこで、本実施形態では、制御部２４は、さらに、所定のデータ記録エリア（例えばデータ記録エリアを複数のゾーンに区切る場合、最外周に位置するゾーンに対応するデータ記録エリア）において、外周記録速度でのＯＰＣを実行し、対象ドライブにおける外周記録速度に対する第２の最適記録パワーＰｔｏ２を求め（Ｓ２０４）、第２の最適記録パワーＰｔｏ２を第１の最適記録パワーＰｔｏ１で除算することで、対象ドライブにおける外周記録速度の補正値ρｏを求める（Ｓ２０６）。つまり、制御部２４は、ρｏ＝Ｐｔｏ２／Ｐｔｏ１という式に基づいて補正値ρｏを求め、補正値ρｏを基準比率係数Ｋｂｏと対応付けてメモリ２６に登録する（Ｓ２０８）。なお、ステップＳ２０４におけるＯＰＣでは、例えば、所定のデータ記録エリアにおいて、すでに求められている第１の最適記録パワーＰｔｏ１を中心として記録パワーを複数段階切り換えて、それぞれβ値を測定し、各記録パワーと各β値とに基づいて最小自乗法等の周知の近似アルゴリズムにより近似直線等の記録パワーとβ値との関係を示す関数を求め、その関数に基づいて目標β値に対応する記録パワーを求めることで、第２の最適記録パワーＰｔｏ２を求める処理を実行する。   Therefore, in the present embodiment, the control unit 24 further performs the outer peripheral recording speed in a predetermined data recording area (for example, when the data recording area is divided into a plurality of zones, the data recording area corresponding to the zone located at the outermost periphery). The second optimum recording power Pto2 with respect to the outer peripheral recording speed in the target drive is obtained (S204), and the second optimum recording power Pto2 is divided by the first optimum recording power Pto1. A correction value ρo for the outer peripheral recording speed is obtained (S206). That is, the control unit 24 obtains the correction value ρo based on the equation ρo = Pto2 / Pto1, and registers the correction value ρo in the memory 26 in association with the reference ratio coefficient Kbo (S208). In the OPC in step S204, for example, in a predetermined data recording area, the recording power is switched in a plurality of stages around the already determined first optimum recording power Pto1, and each β is measured. And a function indicating the relationship between the recording power such as an approximate line and the β value by a well-known approximation algorithm such as a least square method based on each β value and the recording power corresponding to the target β value based on the function. As a result, a process for obtaining the second optimum recording power Pto2 is executed.

このように、本実施形態では、光ディスク装置は、例えば出荷調整時に補正値ρｏを求めメモリ２６に登録しおき、基準比率係数Ｋｂｏに対して補正値ρｏを用いて補正を行った後に、外周記録速度の最適記録パワーを求める。   As described above, in this embodiment, the optical disc apparatus obtains the correction value ρo at the time of shipment adjustment, for example, registers it in the memory 26, corrects the reference ratio coefficient Kbo using the correction value ρo, and then performs outer periphery recording. Find the optimum recording power for speed.

図４は、本実施形態に係る光ディスク装置が外周記録速度の最適記録パワーＰｏを求める手順を示すフローチャートである。   FIG. 4 is a flowchart showing a procedure for obtaining the optimum recording power Po at the outer peripheral recording speed by the optical disc apparatus according to the present embodiment.

図４において、制御部２４は、ユーザからデータ記録要求を受けると、データ記録に先立って、光ディスク１０の最内周に設けられたテスト記録エリアにおいて内周記録速度のＯＰＣを実行し、内周記録速度の最適記録パワーＰｉを求める（Ｓ３００）。次いで、制御部２４は、メモリ２６から外周記録速度に対応する基準比率係数Ｋｂｏと補正値ρｏとを読み出し、内周記録速度の最適記録パワーＰｉに基準比率係数Ｋｂｏと補正値ρｏとを乗算することで、外周記録速度の最適記録パワーＰｏを求める。つまり、制御部２４は、Ｐｏ＝Ｋｂｏ×ρｏ×Ｐｉという式に基づいてＰｏを求める。このように、光ディスク装置ごとに固有の値として定められる補正値ρｏを用いて基準比率係数Ｋｂｏを補正した後に、最適記録パワーＰｏを求めることで、例えば光ピックアップ部１４のレーザダイオード波長やディスク面に対する光軸の傾角がディスク装置ごとに異なることによる誤差の影響を少なくし、光ディスク装置ごとにより精度よくディスク外周部における高速な記録速度に対する最適記録パワーを求めることができる。   In FIG. 4, upon receiving a data recording request from the user, the control unit 24 executes OPC at the inner peripheral recording speed in the test recording area provided on the innermost periphery of the optical disc 10 prior to data recording. The optimum recording power Pi for the recording speed is obtained (S300). Next, the control unit 24 reads the reference ratio coefficient Kbo corresponding to the outer peripheral recording speed and the correction value ρo from the memory 26, and multiplies the optimum recording power Pi for the inner peripheral recording speed by the reference ratio coefficient Kbo and the correction value ρo. Thus, the optimum recording power Po for the outer peripheral recording speed is obtained. That is, the control unit 24 obtains Po based on the equation Po = Kbo × ρo × Pi. In this way, after correcting the reference ratio coefficient Kbo using the correction value ρo determined as a unique value for each optical disc apparatus, the optimum recording power Po is obtained, for example, the laser diode wavelength of the optical pickup unit 14 and the disc surface. Thus, the influence of the error due to the difference in the tilt angle of the optical axis with respect to each disk device can be reduced, and the optimum recording power for the high recording speed at the outer periphery of the disk can be obtained more accurately for each optical disk device.

また、内周テスト記録エリアにおけるＯＰＣにより求められた最適記録パワーに基づいて外周部における高速な記録速度に対する最適記録パワーを求めることができるため、ＯＰＣの実行回数を抑制することができ、実際のデータ記録を開始するまでの時間を短縮することができる。   Further, since the optimum recording power for the high-speed recording speed in the outer peripheral portion can be obtained based on the optimum recording power obtained by OPC in the inner circumference test recording area, the number of executions of OPC can be suppressed, The time required to start data recording can be shortened.

さらに、本実施形態によれば、基準ドライブにて例えば１種類のＤＶＤ−Ｒに対する基準比率係数Ｋｂを予め求めておけば、レーザ光に対する記録感度が異なる他の色素より構成される他種類のＤＶＤ−Ｒについても同様な手順で補正値ρを求めて基準比率係数Ｋｂを補正することができるため、他種類のＤＶＤ−Ｒについても精度よく外周部における高速な記録速度に対する最適記録パワーを求めることができる。   Furthermore, according to the present embodiment, if a reference ratio coefficient Kb for, for example, one type of DVD-R is obtained in advance by a reference drive, other types of DVDs composed of other dyes having different recording sensitivities to laser light. Since the correction value ρ can be obtained in the same procedure for the -R and the reference ratio coefficient Kb can be corrected, the optimum recording power for the high-speed recording speed in the outer peripheral portion can be obtained with high accuracy for other types of DVD-R. Can do.

また、基準比率係数Ｋｂを求めた際の外周記録速度とは異なる記録速度の最適記録パワーを周知の近似アルゴリズムを利用することで求める場合にも、補正値ρにより基準比率係数Ｋｂを補正しておけば、求められる最適記録パワーの精度を向上させることができる。   Also, when the optimum recording power at a recording speed different from the outer peripheral recording speed at the time of obtaining the reference ratio coefficient Kb is obtained by using a known approximation algorithm, the reference ratio coefficient Kb is corrected by the correction value ρ. If so, the accuracy of the required optimum recording power can be improved.

さらに、記録速度と記録パワーとの比が理論値の曲線に概ね近似することを前提とすれば、ＤＶＤ−Ｒで調整した光ディスク装置固有の補正値ρを、他の記録媒体（ＤＶＤ＋Ｒ、ＤＶＤ−ＲＷ、ＤＶＤ＋ＲＷなど）についても併用することが可能である。   Further, assuming that the ratio between the recording speed and the recording power is approximately approximate to the curve of the theoretical value, the correction value p specific to the optical disk apparatus adjusted by the DVD-R is set to another recording medium (DVD + R, DVD- RW, DVD + RW, etc.) can be used together.

なお、上記では、１つの外周記録速度に対する最適記録パワーＰｏを求める例について説明した。しかし、例えば、Ｚｏｎｅ−ＣＬＶ方式のように、ゾーンごとに異なる記録速度が設定されている場合には、設定される記録速度ごとにそれぞれ基準比率係数Ｋｂおよび補正値ρを求めて、メモリ２６に登録しておき、記録速度ごとに基準比率係数Ｋｂおよび補正値ρを用いて、最適記録パワーＰを求めてもよい。また、設定されるすべての記録速度に対応して基準比率係数Ｋｂおよび補正値ρを求めるのではなく、いくつかの記録速度に対応する基準比率係数Ｋｂおよび補正値ρを求めておき、残りの記録速度については、最小二乗法などの周知の近似アルゴリズムに基づいて求めてもよい。   In the above description, the example of obtaining the optimum recording power Po for one outer peripheral recording speed has been described. However, when different recording speeds are set for each zone as in the Zone-CLV method, for example, the reference ratio coefficient Kb and the correction value ρ are obtained for each set recording speed and stored in the memory 26. The optimum recording power P may be obtained by using the reference ratio coefficient Kb and the correction value ρ for each recording speed. Further, instead of obtaining the reference ratio coefficient Kb and the correction value ρ corresponding to all the set recording speeds, the reference ratio coefficient Kb and the correction value ρ corresponding to several recording speeds are obtained, and the remaining The recording speed may be obtained based on a known approximation algorithm such as a least square method.

また、第１の最適記録パワーＰｔｏ１と第２の最適記録パワーＰｔｏ２とが類似する場合には、敢えて補正値ρを求めて基準比率係数Ｋｂを補正しなくても、精度よく最適記録パワーを求めることができる。よって、制御部２４は、補正値ρを求める前に、第１の最適記録パワーＰｔｏ１と第２の最適記録パワーＰｔｏ２との類似度を求めて、その類似度が基準値を満たしていれば補正値ρを求めず、その類似度が基準値より低い場合のみ補正値ρを求めてもよい。例えば、制御部２４は、補正値ρを求める前に、第１の最適記録パワーＰｔｏ１と第２の最適記録パワーＰｔｏ２との差を求めて、その差が予め定めた閾値を越えている場合のみ、補正値ρを求めてもよい。   In addition, when the first optimum recording power Pto1 and the second optimum recording power Pto2 are similar, the optimum recording power can be obtained with high accuracy without deliberately obtaining the correction value ρ and correcting the reference ratio coefficient Kb. be able to. Therefore, the controller 24 obtains the similarity between the first optimum recording power Pto1 and the second optimum recording power Pto2 before obtaining the correction value ρ, and corrects the similarity if the similarity satisfies the reference value. The correction value ρ may be obtained only when the value ρ is not obtained and the similarity is lower than the reference value. For example, the control unit 24 obtains a difference between the first optimum recording power Pto1 and the second optimum recording power Pto2 before obtaining the correction value ρ, and only when the difference exceeds a predetermined threshold value. The correction value ρ may be obtained.

本実施形態に係る光ディスク装置の要部構成ブロック図である。It is a principal part block diagram of the optical disk device concerning this embodiment. 基準ドライブが基準比率係数Ｋｂｏを求める手順を示すフローチャートである。It is a flowchart which shows the procedure in which a reference | standard drive calculates | requires the reference | standard ratio coefficient Kbo. 光ディスク装置が補正値ρを求める手順を示すフローチャートである。5 is a flowchart showing a procedure for an optical disk device to obtain a correction value ρ. 光ディスク装置が補正値ρに基づいて基準比率係数Ｋｂｏを補正する手順を示すフローチャートである。10 is a flowchart illustrating a procedure in which the optical disc apparatus corrects a reference ratio coefficient Kbo based on a correction value ρ.

符号の説明Explanation of symbols

１０ 光ディスク、１２ スピンドルモータ、１４ 光ピックアップ部、１６ ＬＤ駆動部、１８ エンコーダ、２０ ＲＦ信号処理部、２２ デコーダ、２４ 制御部、２６ メモリ。   DESCRIPTION OF SYMBOLS 10 Optical disk, 12 Spindle motor, 14 Optical pick-up part, 16 LD drive part, 18 Encoder, 20 RF signal processing part, 22 Decoder, 24 Control part, 26 Memory

Claims (6)

光ディスクに設けられたデータ記録エリアに、記録速度に応じた最適記録パワーのレーザ光を照射することでデータ記録を行う光ディスク装置において、
特定光ディスク装置が、光ディスクに設けられたデータ記録エリアより内周側の内周テスト記録エリアに第１記録速度で試し記録を行うことにより求められた第１記録速度に対する第１最適記録パワーと、前記特定光ディスク装置が、前記データ記録エリアに前記第１記録速度とは異なる第２記録速度で試し記録を行うことにより求められた第２記録速度に対する第２最適記録パワーとに基づき定められた係数を記憶するメモリと、
光ディスクに設けられた内周テスト記録エリアに前記第１記録速度で試し記録を行うことにより前記第１記録速度に対する第３最適記録パワーを求め、前記メモリに記録された係数と前記第３最適記録パワーとに基づき、前記データ記録エリアにおける前記第２記録速度に対する第４最適記録パワーを求める最適記録パワー決定部と、
を備える光ディスク装置。 In an optical disc apparatus for recording data by irradiating a data recording area provided on the optical disc with laser light having an optimum recording power according to the recording speed,
A first optimum recording power with respect to a first recording speed determined by the specific optical disk device performing trial recording at a first recording speed in an inner circumference test recording area on the inner circumference side of the data recording area provided on the optical disc; A coefficient determined based on a second optimum recording power with respect to a second recording speed obtained by the specific optical disc device performing trial recording at a second recording speed different from the first recording speed in the data recording area. A memory for storing
A third optimum recording power for the first recording speed is obtained by performing trial recording at the first recording speed in an inner periphery test recording area provided on the optical disc, and the coefficient recorded in the memory and the third optimum recording are obtained. And an optimum recording power determination unit for obtaining a fourth optimum recording power for the second recording speed in the data recording area based on the power,
An optical disc device comprising: 請求項１に記載の光ディスク装置において、
前記光ディスクのデータ記録エリアに前記第２記録速度で試し記録を行うことにより前記第２記録速度に対する第５最適記録パワーを求め、前記第４最適記録パワーと前記第５最適記録パワーとに基づき、前記係数を補正するための補正値を求め、前記係数に対応付けて前記補正値を前記メモリに登録する補正値登録部を備え、
前記最適記録パワー決定部は、
前記補正値に基づき前記係数を補正し、補正された係数と前記第３最適記録パワーとに基づき前記第４最適記録パワーを求めることを特徴とする光ディスク装置。 The optical disc apparatus according to claim 1,
By performing trial recording at the second recording speed in the data recording area of the optical disc, a fifth optimum recording power for the second recording speed is obtained, and based on the fourth optimum recording power and the fifth optimum recording power, A correction value registration unit that obtains a correction value for correcting the coefficient and registers the correction value in the memory in association with the coefficient;
The optimum recording power determination unit
An optical disc apparatus, wherein the coefficient is corrected based on the correction value, and the fourth optimum recording power is obtained based on the corrected coefficient and the third optimum recording power. 請求項２に記載の光ディスク装置において、
前記補正値登録部は、
前記第４最適記録パワーと前記第５最適記録パワーとの類似度が所定の基準値より低い場合に、前記補正値を求めて前記メモリに登録することを特徴とする光ディスク装置。 The optical disk apparatus according to claim 2, wherein
The correction value registration unit
An optical disc apparatus characterized in that the correction value is obtained and registered in the memory when the similarity between the fourth optimum recording power and the fifth optimum recording power is lower than a predetermined reference value. 光ディスクの半径位置に応じて異なる記録速度でデータを記録する光ディスク装置であって、
光ディスクの内周側テスト記録エリアで試し書きすることにより該テスト記録エリアの記録速度での第１最適記録パワーを設定する手段と、
特定光ディスク装置における、特定光ディスクの内周側テスト記録エリアの記録速度における最適記録パワーと外周側データ記録エリアの記録速度における最適記録パワーとの関係を規定する相関係数を用いて、前記第１最適記録パワーから前記光ディスクのデータ記録エリアの記録速度における最適記録パワーを演算する手段と、
を有することを特徴とする光ディスク装置。 An optical disk device for recording data at different recording speeds according to the radial position of the optical disk,
Means for setting the first optimum recording power at the recording speed of the test recording area by performing trial writing in the inner periphery side test recording area of the optical disc;
Using the correlation coefficient that defines the relationship between the optimum recording power at the recording speed of the inner circumference side test recording area of the particular optical disk and the optimum recording power at the recording speed of the outer circumference side data recording area in the particular optical disk device. Means for calculating the optimum recording power at the recording speed of the data recording area of the optical disc from the optimum recording power;
An optical disc apparatus comprising: 請求項４記載の装置において、
前記相関係数は、前記内周側テスト記録エリアの記録速度における最適記録パワーに対する前記外周側データ記録エリアの記録速度における最適記録パワーの比であることを特徴とする光ディスク装置。 The apparatus of claim 4.
The optical disc apparatus, wherein the correlation coefficient is a ratio of an optimum recording power at a recording speed in the outer circumference side data recording area to an optimum recording power at a recording speed in the inner circumference side test recording area. 請求項４記載の装置において、さらに、
前記光ディスクのデータ記録エリアで試し書きすることにより前記特定光ディスク装置における前記相関係数を増減調整する手段と、
を有することを特徴とする光ディスク装置。 The apparatus of claim 4, further comprising:
Means for increasing / decreasing the correlation coefficient in the specific optical disc device by trial writing in the data recording area of the optical disc;
An optical disc apparatus comprising:
JP2006154744A 2006-06-02 2006-06-02 Optical disk device Pending JP2007323764A (en)

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Citations (6)

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JPH0773471A (en) * 1993-09-03 1995-03-17 Pioneer Electron Corp Information recorder for draw type optical disk
JP2002304729A (en) * 2001-04-05 2002-10-18 Ricoh Co Ltd Optical disk device and its recording operation control method, and information processor
JP2003168215A (en) * 2001-11-29 2003-06-13 Ricoh Co Ltd Method and device for recording on optical information recording medium
WO2005034108A1 (en) * 2003-10-03 2005-04-14 Pioneer Corporation Information recording medium, information recording device and method, information recording/reproducing device and method, and computer program
JP2006099900A (en) * 2004-09-30 2006-04-13 Teac Corp Optical disk device
JP2006127593A (en) * 2004-10-27 2006-05-18 Ricoh Co Ltd Method and device for recording information

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0773471A (en) * 1993-09-03 1995-03-17 Pioneer Electron Corp Information recorder for draw type optical disk
JP2002304729A (en) * 2001-04-05 2002-10-18 Ricoh Co Ltd Optical disk device and its recording operation control method, and information processor
JP2003168215A (en) * 2001-11-29 2003-06-13 Ricoh Co Ltd Method and device for recording on optical information recording medium
WO2005034108A1 (en) * 2003-10-03 2005-04-14 Pioneer Corporation Information recording medium, information recording device and method, information recording/reproducing device and method, and computer program
JP2006099900A (en) * 2004-09-30 2006-04-13 Teac Corp Optical disk device
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