JP2007115336A

JP2007115336A - Optical disk device

Info

Publication number: JP2007115336A
Application number: JP2005305562A
Authority: JP
Inventors: Shingo Setono; 真吾瀬戸野
Original assignee: Funai Electric Co Ltd
Current assignee: Funai Electric Co Ltd
Priority date: 2005-10-20
Filing date: 2005-10-20
Publication date: 2007-05-10

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the optimum value of recording power even when warp or wobbling is caused in an optical disk in an optical disk recording device. <P>SOLUTION: Writing and reading of signals are performed while changing recording power at a plurality of points located at a regular interval on the periphery of the optical disk. Modulation degree is calculated from a reading signal, its average value is obtained, and relational expression of the recording power and the average value of the reading signal is obtained. Further, optimum recording power P is calculated by applying optimum modulation degree M to the obtained relational expression. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、光ディスクにレーザビームを照射することにより、映像又は音声等の信号を記録する光ディスク記録装置に関するものである。 The present invention relates to an optical disc recording apparatus that records a signal such as video or audio by irradiating a laser beam to an optical disc.

近年、市場に流通している記録用光ディスクは、一定の規格内で製造されているものの、各メーカー毎に詳細な仕様が異なり、記録に最適な記録パワーが異なっている。そこで、光ディスクに信号を記録する光ディスク記録装置においては、映像等の信号を記録する前に、ＯＰＣ（Optimum Power Calibration）と称される処理を行って記録パワーの最適値（目標値）を決定している。ＯＰＣとは、光ディスクの内周部に形成されているＰＣＡ（Power Calibration Area）に記録パワーを変化させながら信号を書き込み、その信号を再生することにより、記録パワーの最適値を決定する処理である。 In recent years, recording optical disks on the market have been manufactured within a certain standard, but detailed specifications differ for each manufacturer, and the optimum recording power for recording differs. Therefore, in an optical disk recording apparatus that records a signal on an optical disk, an optimal value (target value) of recording power is determined by performing a process called OPC (Optimum Power Calibration) before recording a signal such as an image. ing. OPC is a process for determining an optimum value of recording power by writing a signal to a PCA (Power Calibration Area) formed on the inner periphery of the optical disc while changing the recording power and reproducing the signal. .

ＯＰＣに関しては、以下の先行技術文献が開示されている。例えば、特許文献１には、変調度の変曲点に対応する記録パワーに所定のパラメータを乗ずることにより、記録パワーの最適値を求めるようにした光ディスク記録装置が示されている。また、特許文献２には、記録パワーと、該記録パワー及び変調度の積との関係から記録パワーの最適値を求めるようにした光ディスク記録装置が示されている。また、特許文献３には、記録パワーと変調度との関係を直線近似することにより、記録パワーの最適値を求めるようにした光ディスク記録装置が示されている。また、特許文献４には、再生信号のβ値と変調度を最適記録パワーの判断基準とする光ディスク記録装置が示されている。
特開２００３−６７９２５号公報特開２００５−１４９５３８号公報特開２００５−２０９２８７号公報実用新案登録第３０５７８７５号公報 Regarding OPC, the following prior art documents are disclosed. For example, Patent Document 1 discloses an optical disc recording apparatus in which an optimum value of recording power is obtained by multiplying a recording power corresponding to an inflection point of a modulation degree by a predetermined parameter. Patent Document 2 discloses an optical disk recording apparatus in which an optimum value of recording power is obtained from the relationship between recording power and the product of the recording power and the modulation factor. Patent Document 3 discloses an optical disk recording apparatus in which the optimum value of recording power is obtained by linearly approximating the relationship between recording power and modulation factor. Patent Document 4 discloses an optical disk recording apparatus that uses the β value and modulation degree of a reproduction signal as criteria for determining the optimum recording power.
JP 2003-67925 A JP-A-2005-149538 JP 2005-209287 A Utility Model Registration No. 3057875

一般に、材質の異なる複数の層から成る光ディスクは、その構造上、又は保管状態によっては、記録面に不均一な反りを生じてしまうことがある。また、光ディスクのチャッキング状態によっては、光ディスクの回転時に面振れが生じてしまうことがある。このような、光ディスクの反りや面振れは、一定の範囲内であれば、光ディスク記録装置の光ピックアップに備えられているサーボ機構によって吸収され、通常の記録時に問題が生ずる虞はない。 In general, an optical disk composed of a plurality of layers made of different materials may cause uneven warping on the recording surface depending on the structure or storage condition. Further, depending on the chucking state of the optical disk, surface wobbling may occur when the optical disk rotates. Such warpage and surface wobbling of the optical disk are absorbed by the servo mechanism provided in the optical pickup of the optical disk recording apparatus within a certain range, and there is no possibility of causing a problem during normal recording.

しかしながら、光ディスクに反りや面触れ等が生じている状態では、信号の記録面に対するレーザビームの入射角が一定せず、最適な記録パワーを得ることができないことがある。 However, when the optical disk is warped or touched, the incident angle of the laser beam with respect to the signal recording surface is not constant, and the optimum recording power may not be obtained.

本発明は、上記課題を解決するためになされたものであり、光ディスクに反り又は面振れが生じている場合であっても、記録パワーの最適値を求めることができる光ディスク記録装置を提供することを目的とする。 The present invention has been made to solve the above problems, and provides an optical disc recording apparatus capable of obtaining an optimum value of recording power even when the optical disc is warped or run out. With the goal.

上記目的を達成するために請求項１の発明は、光ディスクを回転駆動するディスク駆動手段と、このディスク駆動手段によって回転駆動された光ディスクにレーザビームを照射して信号の書き込み／読み出しを行う光ピックアップと、この光ピックアップが読み出した信号を処理する信号処理手段と、光ピックアップを駆動するピックアップ駆動手段と、信号処理手段によって処理された信号に基いて、ディスク駆動手段及びピックアップ駆動手段を制御する制御手段とを備え、光ピックアップは、レーザビームを出射する発光素子と、この発光素子から出射されたレーザビームを光ディスクの記録面に集光させる対物レンズと、光ディスクの記録面によって反射されたレーザビームを受光する受光素子とを有し、光ディスクに信号を記録する前に、光ディスクのＰＣＡ（Power Calibration Area）において、発光素子から出射されるレーザビームの記録パワーを変化させながら信号を書き込み、その信号を受光素子によって読み取り、この読み取り信号の変調度を用いて最適記録パワーを算出し、その最適記録パワーに基いて信号書き込み時の発光素子の記録パワーを最適制御する光ディスク記録装置において、制御手段は、光ディスクに信号を記録する前に、光ディスクのＰＣＡの先頭領域において、予め粗く記録パワーを変化させながら信号を書き込み、その信号を受光素子によって読み取り、読み取り信号の変調度が適正に取得できる記録パワーの範囲を算出し、先頭領域以外のＰＣＡにおいて、複数回に亘り、光ディスクの周上均等間隔にある位置で記録パワーを変化させながら信号を書き込み、その信号を受光素子によって読み取り、各記録パワー毎に読み取り信号の変調度の平均値を計算し、算出した記録パワーの範囲内における記録パワーと読み取り信号の変調度の平均値との関係式を求め、該関係式に読み出しに最適な変調度を当てはめて最適記録パワーを算出することにより、光ディスクの反り又は面振れが最適記録パワーの算出に及ぼす影響を抑制し得るようにしたものである。 In order to achieve the above object, an invention according to claim 1 is directed to a disk driving means for rotationally driving an optical disk, and an optical pickup for irradiating a laser beam to the optical disk rotationally driven by the disk driving means to write / read a signal. And a signal processing means for processing the signal read by the optical pickup, a pickup driving means for driving the optical pickup, and a control for controlling the disk driving means and the pickup driving means based on the signal processed by the signal processing means. The optical pickup includes a light emitting element that emits a laser beam, an objective lens that focuses the laser beam emitted from the light emitting element on the recording surface of the optical disc, and a laser beam reflected by the recording surface of the optical disc. A light receiving element that receives light and records signals on an optical disc Before, in the PCA (Power Calibration Area) of the optical disk, the signal is written while changing the recording power of the laser beam emitted from the light emitting element, the signal is read by the light receiving element, and the optimum is used by using the degree of modulation of the read signal. In an optical disk recording apparatus that calculates a recording power and optimally controls the recording power of the light emitting element at the time of signal writing based on the optimum recording power, the control means records the leading area of the PCA of the optical disk before recording the signal on the optical disk. In this case, the signal is written in advance while roughly changing the recording power, the signal is read by the light receiving element, the range of the recording power in which the modulation degree of the read signal can be properly obtained is calculated, and the PCA other than the head area is calculated multiple times. While changing the recording power at evenly spaced positions on the circumference of the optical disk The signal is read by the light receiving element, the average value of the modulation degree of the read signal is calculated for each recording power, and the recording power within the calculated recording power range and the average value of the modulation degree of the read signal are calculated. By calculating the optimum recording power by obtaining the relational expression and applying the optimum modulation degree for reading to the relational expression, it is possible to suppress the influence of the warp or surface vibration of the optical disc on the calculation of the optimum recording power. It is.

請求項２の発明は、光ディスクを回転駆動するディスク駆動手段と、この駆動手段によって回転駆動された光ディスクにレーザビームを照射して信号の書き込み／読み出しを行う光ピックアップと、この光ピックアップが読み出した信号を処理する信号処理手段と、光ピックアップを駆動するピックアップ駆動手段と、信号処理手段によって処理された信号に基いて、ディスク駆動手段及びピックアップ駆動手段を制御する制御手段とを備え、光ピックアップは、レーザビームを出射する発光素子と、この発光素子から出射されたレーザビームを光ディスクの記録面に集光させる対物レンズと、光ディスクの記録面によって反射されたレーザビームを受光する受光素子とを有し、光ディスクに信号を記録する前に、光ディスクのＰＣＡ（Power Calibration Area）において、発光素子から出射されるレーザビームの記録パワーを変化させながら信号を書き込み、その信号を受光素子によって読み取り、この読み取り信号の変調度を用いて最適記録パワーを算出し、その最適記録パワーに基いて信号書き込み時の発光素子の記録パワーを最適制御する光ディスク記録装置において、制御手段は、先頭領域以外のＰＣＡにおいて、複数回に亘り、光ディスクの周上均等間隔にある位置で記録パワーを変化させながら信号を書き込み、その信号を受光素子によって読み取り、各記録パワー毎に読み取り信号の変調度の平均値を計算し、記録パワーと読み取り信号の変調度の平均値との関係式を求め、該関係式に読み出しに最適な変調度を当てはめて最適記録パワーを算出することにより、光ディスクの反り又は面振れが最適記録パワーの算出に及ぼす影響を抑制し得るようにしたものである。 According to a second aspect of the present invention, there is provided a disk drive means for rotationally driving an optical disk, an optical pickup for irradiating a laser beam to the optical disk rotationally driven by the drive means to write / read a signal, and the optical pickup The optical pickup includes a signal processing means for processing a signal, a pickup driving means for driving the optical pickup, and a control means for controlling the disk driving means and the pickup driving means based on the signal processed by the signal processing means. A light-emitting element that emits a laser beam, an objective lens that focuses the laser beam emitted from the light-emitting element on the recording surface of the optical disc, and a light-receiving element that receives the laser beam reflected by the recording surface of the optical disc. Before recording a signal on the optical disc, the PCA (Power C alibration Area), a signal is written while changing the recording power of the laser beam emitted from the light emitting element, the signal is read by the light receiving element, and the optimum recording power is calculated using the degree of modulation of the read signal, and the optimum In the optical disk recording apparatus that optimally controls the recording power of the light emitting element at the time of signal writing based on the recording power, the control means records at a position that is evenly spaced on the circumference of the optical disk multiple times in the PCA other than the head area. Write the signal while changing the power, read the signal with the light receiving element, calculate the average value of the modulation degree of the read signal for each recording power, and calculate the relational expression between the recording power and the average value of the modulation degree of the read signal The optimum recording power is calculated by applying the optimum modulation degree for reading to the relational expression and calculating the optical disc. Shake warping or surface of is obtained by adapted to suppress the influence on the calculation of the optimum recording power.

請求項１の発明によれば、複数回に亘り、光ディスクの周上均等間隔にある位置で記録パワーを変化させながら信号の書き込み及び読み取りを行い、制御手段が、記録パワーと読み取り信号の変調度の平均値との関係式から最適記録パワーを算出する。これにより、読み取り信号の変調度が１周回に亘って平均化されることになるので、光ディスクの反り又は面振れが生じていても、最適記録パワーの算出に影響が及びにくくなる。従って、記録パワーの最適値を精度良く算出できるようになり、光ディスクへの記録品質を高めることができる。また、光ディスクに信号を記録する前に、予め粗く記録パワーを変化させながら信号を書き込むことにより、読み取り信号の変調度が適正に取得できる記録パワーの範囲を算出し、その範囲内で最適記録パワーを算出するので、より正確に記録パワーの最適値を算出できるようになる。 According to the first aspect of the present invention, the control means writes and reads the signal while changing the recording power at a position at equal intervals on the circumference of the optical disk for a plurality of times, and the control means modulates the recording power and the modulation degree of the read signal. The optimum recording power is calculated from the relational expression with the average value. As a result, the degree of modulation of the read signal is averaged over one round, so that even if the optical disk is warped or run out, the calculation of the optimum recording power is hardly affected. Accordingly, the optimum value of the recording power can be accurately calculated, and the recording quality on the optical disc can be improved. Also, before recording the signal on the optical disc, write the signal while changing the recording power roughly in advance to calculate the recording power range where the modulation degree of the read signal can be properly acquired, and within that range the optimum recording power Therefore, the optimum value of the recording power can be calculated more accurately.

請求項２の発明によれば、複数回に亘り、光ディスクの周上均等間隔にある位置で記録パワーを変化させながら信号の書き込み及び読み取りを行い、制御手段が、記録パワーと読み取り信号の変調度の平均値との関係式から最適記録パワーを算出する。これにより、読み取り信号の変調度が１周回に亘って平均化されることになるので、光ディスクの反り又は面振れが生じていても、最適記録パワーの算出に影響が及びにくくなる。従って、記録パワーの最適値を精度良く算出できるようになり、光ディスクへの記録品質を高めることができる。 According to the second aspect of the present invention, the control means performs the writing and reading of the signal while changing the recording power at a position that is evenly spaced on the circumference of the optical disc for a plurality of times, and the control means modulates the recording power and the degree of modulation of the read signal. The optimum recording power is calculated from the relational expression with the average value. As a result, the degree of modulation of the read signal is averaged over one round, so that even if the optical disk is warped or run out, the calculation of the optimum recording power is hardly affected. Accordingly, the optimum value of the recording power can be accurately calculated, and the recording quality on the optical disc can be improved.

本発明を実施するための最良の実施形態による光ディスク記録装置について図面を参照して説明する。図１は光ディスク記録装置の概略構成を示している。光ディスク記録装置１は、光ディスクＤを回転駆動するスピンドルモータ（ディスク駆動手段）２と、回転中の光ディスクＤにレーザビームを照射して信号の書き込み／読み出しを行う光ピックアップ３と、光ピックアップ３が読み出した信号を処理する信号処理部（信号処理手段）４と、スピンドルモータ２及び光ピックアップ３に駆動電圧を印加する駆動部（ディスク駆動手段、ピックアップ駆動手段）５と、装置各部の制御を司る制御部（制御手段）６等によって構成されている。制御部６は、例えば、信号処理部４によって処理された信号に基いて、駆動部５を介してスピンドルモータ２及び光ピックアップ３を制御する。 An optical disk recording apparatus according to the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of an optical disk recording apparatus. An optical disk recording apparatus 1 includes a spindle motor (disk drive means) 2 that rotationally drives an optical disk D, an optical pickup 3 that writes / reads a signal by irradiating a rotating optical disk D with a laser beam, and an optical pickup 3 It controls the signal processing unit (signal processing unit) 4 for processing the read signal, the driving unit (disk driving unit, pickup driving unit) 5 for applying the driving voltage to the spindle motor 2 and the optical pickup 3, and the control of each part of the apparatus. It is comprised by the control part (control means) 6 grade | etc.,. For example, the control unit 6 controls the spindle motor 2 and the optical pickup 3 via the drive unit 5 based on the signal processed by the signal processing unit 4.

光ピックアップ３は、レーザビームを出射するレーザダイオード（発光素子）１１と、レーザダイオード１１から出射されたレーザビームを平行光線にするコリメータレンズ１３と、コリメータレンズ１３を透過したレーザビームを光ディスクＤの記録面に集光させる対物レンズ１４と、レーザダイオード１１から出射されたレーザビームをコリメータレンズ１３に向けて透過させると共に、光ディスクＤの記録面によって反射され、対物レンズ１４及びコリメータレンズ１３を透過したレーザビームをフォトダイオード１５に向けて反射させるビームスプリッタ１２と、ビームスプリッタ１２によって反射されたレーザビームを受光するフォトダイオード（受光素子）１５等によって構成されている。 The optical pickup 3 includes a laser diode (light emitting element) 11 that emits a laser beam, a collimator lens 13 that collimates the laser beam emitted from the laser diode 11, and a laser beam that has passed through the collimator lens 13. The objective lens 14 for condensing on the recording surface and the laser beam emitted from the laser diode 11 are transmitted toward the collimator lens 13, reflected by the recording surface of the optical disc D, and transmitted through the objective lens 14 and the collimator lens 13. The beam splitter 12 reflects the laser beam toward the photodiode 15, and the photodiode (light receiving element) 15 receives the laser beam reflected by the beam splitter 12.

図２は、光ディスクの内周部に形成されているＰＣＡを示している。既に述べたように、光ディスク記録装置１においては、映像等の信号を光ディスクＤに記録する前に、ＰＣＡを用いてＯＰＣを行い、記録パワーを最適化する。本実施形態においては、ＰＣＡの先頭領域（最内周領域）において、まず粗く記録パワーを変化させながら信号を書き込むことにより粗ＯＰＣを行い、読み取り信号の変調度が適正に取得できる記録パワーの範囲を算出し、その算出した記録パワーの範囲内で３回に亘ってＯＰＣを行う。３回のＯＰＣは、ＰＣＡの１周のうち、均等間隔にある領域でなされる。即ち、粗ＯＰＣを行った領域に隣接する領域で１回目のＯＰＣを行い、この１回目のＯＰＣ領域から２４０゜離れた領域で２回目のＯＰＣを行う。同様に、２回目のＯＰＣ領域から２４０゜離れた領域で３回目のＯＰＣを行う。 FIG. 2 shows the PCA formed on the inner periphery of the optical disc. As already described, in the optical disc recording apparatus 1, before recording a signal such as a video on the optical disc D, OPC is performed using PCA to optimize the recording power. In the present embodiment, in the head area (innermost peripheral area) of PCA, first, coarse OPC is performed by writing a signal while roughly changing the recording power, and the range of recording power in which the modulation degree of the read signal can be appropriately acquired. And OPC is performed three times within the calculated recording power range. Three OPCs are performed in a region that is evenly spaced out of one round of the PCA. That is, the first OPC is performed in an area adjacent to the area where the rough OPC has been performed, and the second OPC is performed in an area 240 ° away from the first OPC area. Similarly, the third OPC is performed in an area 240 ° away from the second OPC area.

図３は、光ピックアップ３が各領域でＯＰＣを行う手順を示している。まず、光ピックアップ３は、１周目において第１領域で記録パワーを段階的に変化させながら信号を書き込み、その信号を２周目に読み出す。そして、光ピックアップ３は、引き続き２周目に第２領域で記録パワーを変化させながら信号を書き込み、その信号を３周目に読み出す。さらに、光ピックアップ３は、４周目に第３領域で記録パワーを変化させながら信号を書き込み、その信号を５周目に読み出す。 FIG. 3 shows a procedure in which the optical pickup 3 performs OPC in each area. First, the optical pickup 3 writes a signal while gradually changing the recording power in the first area in the first round, and reads the signal in the second round. Then, the optical pickup 3 continues to write a signal while changing the recording power in the second area in the second round, and reads the signal in the third round. Further, the optical pickup 3 writes a signal while changing the recording power in the third area on the fourth round, and reads the signal on the fifth round.

図４は、各領域でＯＰＣを行う際のレーザダイオード１１の記録パワーの波形を示している。本実施形態では、各ＯＰＣ領域で、図４に示すように、徐々に記録パワーを大きくして信号を書き込む。 FIG. 4 shows the waveform of the recording power of the laser diode 11 when OPC is performed in each region. In this embodiment, in each OPC area, as shown in FIG. 4, the recording power is gradually increased to write a signal.

図５は、フォトダイオード１５の読み出し信号を示している。フォトダイオード１５からは、レーザダイオード１１の記録パワーに対応する波形の信号が再生される。光ディスクＤの記録面のうちレーザビームが照射された部分は、非結晶状態となり反射率が低下する。従って、図４に示すように、レーザダイオード１１の記録パワーを徐々に大きくすると、フォトダイオード１５の出力波形の振幅も徐々に大きくなる。 FIG. 5 shows a read signal of the photodiode 15. A signal having a waveform corresponding to the recording power of the laser diode 11 is reproduced from the photodiode 15. Of the recording surface of the optical disc D, the portion irradiated with the laser beam is in an amorphous state and the reflectance is lowered. Therefore, as shown in FIG. 4, when the recording power of the laser diode 11 is gradually increased, the amplitude of the output waveform of the photodiode 15 is also gradually increased.

図５において、結晶状態の部分の読み出しレベルをＡ、このＡと非結晶状態の部分の読み出しレベルの差をＢとすると、変調度は、Ｂ／Ａによって表される。非結晶状態の部分の反射率は、記録パワーの増大に応じて低下するので、これに伴い変調度Ｂ／Ａは徐々に大きくなる。 In FIG. 5, when the readout level of the crystalline state portion is A, and the difference between the readout level of A and the non-crystalline portion is B, the degree of modulation is represented by B / A. Since the reflectance of the non-crystalline portion decreases as the recording power increases, the degree of modulation B / A gradually increases accordingly.

図６は、記録パワーと変調度との関係を示している。変調度は、上述した第１領域乃至第３領域の平均値を示している。記録パワーが著しく小さくなると（同図において、Ｐ０より小さくなると）、読み取り信号の変調度が適正に取得することができなくなる。そして、このように適正な変調度が取得できなくなる記録パワーの臨界値は、上述した粗ＯＰＣで求めることができる。例えば、粗ＯＰＣによって変調度が所定値Ｍ０を超えるような記録パワーの下限値Ｐ０を求めることができる。また、記録パワーがＰ１のとき変調度が略頂点に達することから、記録パワーはＰ０からＰ１の範囲内で変調度が２次曲線で近似できる。 FIG. 6 shows the relationship between the recording power and the modulation factor. The degree of modulation indicates the average value of the first to third areas described above. When the recording power is extremely small (in the figure, smaller than P0), the modulation degree of the read signal cannot be acquired properly. The critical value of the recording power at which an appropriate degree of modulation cannot be obtained can be obtained by the above-described rough OPC. For example, the lower limit P0 of the recording power such that the modulation degree exceeds a predetermined value M0 can be obtained by rough OPC. Further, since the modulation degree reaches approximately the top when the recording power is P1, the recording power can be approximated by a quadratic curve within the range of P0 to P1.

そこで、本実施形態では、記録パワーがＰ０からＰ１の範囲内における記録パワーと変調度の平均値との関係を２次曲線の関係式で近似して、その関係式に、読み出しに最適な変調度Ｍを当てはめて最適記録パワーＰを算出する。 Therefore, in the present embodiment, the relationship between the recording power and the average value of the modulation degree in the range where the recording power is in the range of P0 to P1 is approximated by a relational expression of a quadratic curve, and the optimum modulation for reading is obtained by the relational expression. The optimum recording power P is calculated by applying the degree M.

以上のように、本実施形態の光ディスク記録装置１によれば、３回に亘り周上均等間隔で記録パワーを変化させながら信号の書き込み及び読み取りを行い、制御部６が、記録パワーと読み取り信号の変調度の平均値との関係式から最適記録パワーＰを算出する。これにより、読み取り信号の変調度が１周回に亘って平均化されることになるので、光ディスクＤの反り又は面振れが生じていても、最適記録パワーＰの算出に影響が及びにくくなり、その算出精度が高められる。従って、精度良く算出された最適記録パワーＰで信号を記録できるようになり、記録品質を高めることができる。また、光ディスクＤに信号を記録する前に、予め粗く記録パワーを変化させながら信号を書き込むことにより、読み取り信号の変調度Ｍが適正に取得できる記録パワーの範囲Ｐ０〜Ｐ１を算出し、その範囲内で最適記録パワーＰを算出するので、より正確に記録パワーの最適値を算出できるようになる。 As described above, according to the optical disc recording apparatus 1 of the present embodiment, the signal is written and read while changing the recording power at equal circumferential intervals for three times, and the control unit 6 records the recording power and the reading signal. The optimum recording power P is calculated from the relational expression with the average value of the modulation degree. As a result, the degree of modulation of the read signal is averaged over one round, so that even if the optical disc D is warped or run out, the calculation of the optimum recording power P is hardly affected. Calculation accuracy is increased. Therefore, the signal can be recorded with the optimum recording power P calculated with high accuracy, and the recording quality can be improved. In addition, before recording a signal on the optical disc D, by writing the signal while changing the recording power roughly in advance, a recording power range P0 to P1 in which the modulation degree M of the read signal can be appropriately acquired is calculated, and the range is calculated. Since the optimum recording power P is calculated within this, the optimum value of the recording power can be calculated more accurately.

なお、本発明は上記実施形態の構成に限られることなく、少なくとも光ディスクＤの周上均等間隔にある位置で複数回ＯＰＣを行い、変調度の平均に基いて最適記録パワーを決定するように構成されていればよい。また、本発明は、種々の変形が可能であり、例えば、複数個所の変調度から計算されたγ値の平均値を算出し、記録パワーとγ値の平均値との関係式を求め、この関係式に読み出しに最適なγ値を当てはめて最適記録パワーを決定するように構成されていてもよい。 The present invention is not limited to the configuration of the above-described embodiment, and is configured to perform OPC a plurality of times at least at positions that are evenly spaced on the circumference of the optical disc D, and to determine the optimum recording power based on the average of the modulation degree. It only has to be done. Further, the present invention can be variously modified. For example, the average value of γ values calculated from the degree of modulation at a plurality of locations is calculated, and a relational expression between the recording power and the average value of γ values is obtained. The optimum recording power may be determined by applying an optimum γ value for reading to the relational expression.

本発明の一実施形態による光ディスク記録装置の概略構成を示す図。1 is a diagram showing a schematic configuration of an optical disc recording apparatus according to an embodiment of the present invention. 光ディスクの内周部に形成されているＰＣＡと、ＯＰＣを行う領域の関係を示す図。The figure which shows the relationship between PCA currently formed in the inner peripheral part of an optical disk, and the area | region which performs OPC. 同装置の光ピックアップがＯＰＣを行う手順を示す図。The figure which shows the procedure in which the optical pick-up of the apparatus performs OPC. ＯＰＣにおけるレーザダイオードの記録パワーの波形を示す図。The figure which shows the waveform of the recording power of the laser diode in OPC. ＯＰＣにおけるフォトダイオードの読み出し信号を示す図。The figure which shows the read-out signal of the photodiode in OPC. 記録パワーと変調度の平均値との関係を示す図。The figure which shows the relationship between recording power and the average value of a modulation degree.

Explanation of symbols

１光ディスク記録装置
２スピンドルモータ（ディスク駆動手段）
３光ピックアップ
４信号処理部（信号処理手段）
５駆動部（ディスク駆動手段、光ピックアップ駆動手段）
６制御部（制御手段）
１１レーザダイオード（発光素子）
１４対物レンズ
１５フォトダイオード（受光素子） DESCRIPTION OF SYMBOLS 1 Optical disk recording device 2 Spindle motor (disk drive means)
3 Optical pickup 4 Signal processing unit (signal processing means)
5 Drive unit (disk drive means, optical pickup drive means)
6 Control unit (control means)
11 Laser diode (light emitting element)
14 Objective lens 15 Photodiode (light receiving element)

Claims

Disk drive means for rotating the optical disk, an optical pickup for writing / reading a signal by irradiating the optical disk rotated by the disk drive means with a laser beam, and signal processing for processing the signal read by the optical pickup Means, a pickup driving means for driving the optical pickup, and a control means for controlling the disk driving means and the pickup driving means based on the signal processed by the signal processing means,
The optical pickup includes a light emitting element that emits a laser beam, an objective lens that focuses the laser beam emitted from the light emitting element on a recording surface of the optical disc, and a light receiving device that receives the laser beam reflected by the recording surface of the optical disc. Having an element,
Before recording a signal on the optical disk, the signal is written in the PCA (Power Calibration Area) of the optical disk while changing the recording power of the laser beam emitted from the light emitting element, and the signal is read by the light receiving element. In the optical disc recording apparatus that calculates the optimum recording power using the modulation degree of the signal and optimally controls the recording power of the light emitting element at the time of signal writing based on the optimum recording power.
The control means includes
Before recording a signal on the optical disk, in the first area of the PCA of the optical disk, the signal is written in advance while roughly changing the recording power, the signal is read by the light receiving element, and the modulation degree of the read signal can be appropriately acquired. Calculate the power range,
In the PCA other than the head area, a signal is written while changing the recording power at a position that is evenly spaced on the circumference of the optical disc for a plurality of times, the signal is read by the light receiving element, and the read signal is read for each recording power. Calculate the average value of the modulation factor, find the relational expression between the recording power and the average modulation degree of the read signal within the calculated recording power range, and apply the optimum modulation degree for reading to the relational expression An optical disc recording apparatus characterized in that, by calculating the recording power, it is possible to suppress the influence of warpage or surface deflection of the optical disc on the calculation of the optimum recording power.

Disk drive means for rotating the optical disk, an optical pickup for writing / reading a signal by irradiating a laser beam to the optical disk rotated by the drive means, and a signal processing means for processing a signal read by the optical pickup And a pickup driving means for driving the optical pickup, and a control means for controlling the disk driving means and the pickup driving means based on the signal processed by the signal processing means,
The optical pickup includes a light emitting element that emits a laser beam, an objective lens that focuses the laser beam emitted from the light emitting element on a recording surface of the optical disc, and a light receiving device that receives the laser beam reflected by the recording surface of the optical disc. Having an element,
Before recording the signal on the optical disc, the signal is written in the PCA (Power Calibration Area) of the optical disc while changing the recording power of the laser beam emitted from the light emitting element, and the signal is read by the light receiving element. In the optical disc recording apparatus that calculates the optimum recording power using the modulation degree of the signal and optimally controls the recording power of the light emitting element at the time of signal writing based on the optimum recording power.
The control means includes
In the PCA other than the head area, a signal is written while changing the recording power at a position that is evenly spaced on the circumference of the optical disc for a plurality of times, the signal is read by the light receiving element, and the read signal is read for each recording power. By calculating the average value of the modulation degree, obtaining a relational expression between the recording power and the average value of the modulation degree of the read signal, and applying the optimum modulation degree for reading to the relational expression to calculate the optimum recording power, An optical disc recording apparatus characterized in that the influence of the warpage or surface runout on the calculation of the optimum recording power can be suppressed.