JP2003151160A - Optical disk device and optical power control method - Google Patents

Optical disk device and optical power control method

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Publication number
JP2003151160A
JP2003151160A JP2001341670A JP2001341670A JP2003151160A JP 2003151160 A JP2003151160 A JP 2003151160A JP 2001341670 A JP2001341670 A JP 2001341670A JP 2001341670 A JP2001341670 A JP 2001341670A JP 2003151160 A JP2003151160 A JP 2003151160A
Authority
JP
Japan
Prior art keywords
voltage
detection circuit
peak
circuit
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001341670A
Other languages
Japanese (ja)
Inventor
Yoshiro Kashiwabara
芳郎 柏原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP2001341670A priority Critical patent/JP2003151160A/en
Publication of JP2003151160A publication Critical patent/JP2003151160A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device, in which the optimum power learning is accurately performable independently of the measurement accuracy of a β value and a γ value. SOLUTION: This optical disk device has such a special feature that each circuit characteristic of a peak detecting circuit 2 and a bottom detecting circuit 3 is obtained by applying voltages to these detecting circuits from a D-A converter 8 in the manner of changing over a changeover switch 7 before the peak voltage and the bottom voltage are detected, and when the peak voltage and the bottom voltage are to be detected, the changeover switch 7 is changed over to measure the peak voltage and the bottom voltage, then the βvalue is computed by correcting in accordance with the circuit characteristics.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、高精度でβ値とγ
値の測定ができる光ディスク装置、およびその光パワ制
御方法に関するものである。
TECHNICAL FIELD The present invention relates to highly accurate β value and γ
The present invention relates to an optical disc device capable of measuring values and an optical power control method thereof.

【0002】[0002]

【従来の技術】光ディスク装置において、記録メディア
はメディアメーカ毎に記録材料が異なるために、記録メ
ディア毎に記録パワを最適化する必要がある。そのため
にCD−RやCD−RW、DVD−R、DVD−RW、
DVD−RAM等では、ディスクで規定されたパワキャ
リブレーション領域(Power Calibration Area、以下P
CAともいう)を利用して最適な記録パワをその都度学
習している。図13は従来の光ディスク装置のβ値測定
の回路構成図、図14は従来の光ディスク装置のβ値測
定制御フローチャート、図15は従来の光ディスク装置
のγ値測定の回路構成図、図16は従来の光ディスク装
置のγ値測定制御フローチャートである。
2. Description of the Related Art In an optical disk device, since recording media have different recording materials for different media manufacturers, it is necessary to optimize the recording power for each recording medium. Therefore, CD-R, CD-RW, DVD-R, DVD-RW,
In DVD-RAM, etc., a power calibration area (hereinafter referred to as P
The optimum recording power is learned each time by using (also called CA). FIG. 13 is a circuit configuration diagram of β value measurement of a conventional optical disc device, FIG. 14 is a β value measurement control flowchart of a conventional optical disc device, FIG. 15 is a circuit configuration diagram of γ value measurement of a conventional optical disc device, and FIG. 16 is conventional. 3 is a flowchart of a γ value measurement control of the optical disc device.

【0003】ところで、この学習のための最適パワ制御
(Optimum Power Control)を行うとき、CD−RやD
VD−R等のような色素系のディスクは、記録感度が高
いために記録パワ変化に対するRF信号のアシンメトリ
の変化が大きい。そこで記録パワを学習するときに、ア
シンメトリを示すβ値が最適になるような値を最適な記
録パワとして学習している。
By the way, when performing optimum power control for this learning, CD-R and D
A dye-based disc such as a VD-R has a high recording sensitivity, and thus a change in asymmetry of an RF signal with respect to a change in recording power is large. Therefore, when learning the recording power, a value such that the β value indicating the asymmetry is optimized is learned as the optimum recording power.

【0004】この従来のRF信号のβ値を測定する方法
は、図13に示すようにRF信号をコンデンサ1でAC
カップリングした信号(RF信号のAC成分信号)をピ
ーク検出回路2に入力し、ピーク検出回路2から出力さ
れるピーク電圧をAD変換器5で変換したピーク値(A
1)と、同じくRF信号をACカップリングした信号を
ボトム検出回路3に入力し、ボトム検出回路3から出力
されるボトム電圧をAD変換器5で変換したボトム値
(A2)を測定して、この2値に基づいて次の(数1)
で求めるものである。
This conventional method for measuring the β value of an RF signal is as shown in FIG.
The coupled signal (AC component signal of RF signal) is input to the peak detection circuit 2 and the peak voltage output from the peak detection circuit 2 is converted by the AD converter 5 to obtain a peak value (A
1) and similarly, the signal obtained by AC coupling the RF signal is input to the bottom detection circuit 3, and the bottom value (A2) obtained by converting the bottom voltage output from the bottom detection circuit 3 by the AD converter 5 is measured, Based on these two values, the following (Equation 1)
It is what you ask for.

【0005】[0005]

【数1】 [Equation 1]

【0006】従って、CD−RやDVD−Rにおいて最
適パワ制御を行うときには、図14のフローチャートに
示すように、光ディスクで規定されたパワキャリブレー
ション領域に移動し(S101)、記録パワを変化させ
ながら記録を行う(S102)。次に、記録を開始した
場所に戻り、RF信号の測定とβ値の演算を行いながら
信号の再生を行い(S103)、最適なβ値となったと
きの記録パワを最適な記録パワとして学習する(S10
4)、という手順で行われる。
Therefore, when performing optimum power control in a CD-R or a DVD-R, as shown in the flow chart of FIG. 14, the recording power is changed by moving to the power calibration area defined by the optical disk (S101). Meanwhile, recording is performed (S102). Next, returning to the place where the recording is started, the signal is reproduced while the RF signal is measured and the β value is calculated (S103), and the recording power when the optimum β value is obtained is learned as the optimum recording power. Yes (S10
The procedure is 4).

【0007】これに対して、CD−RWやDVD−RW
等のような相変化系のディスクは、記録感度が低いため
に記録パワ変化に対するRF信号のアシンメトリの変化
が小さいという特徴がある。従って、最適なパワを学習
するときには、変調率/記録パワ(=γ値)が最適な値
となるようにパワ調整を行う。
On the other hand, CD-RW and DVD-RW
A phase change type disc such as the one described above has a characteristic that a change in asymmetry of an RF signal with respect to a change in recording power is small because of a low recording sensitivity. Therefore, when learning the optimum power, the power is adjusted so that the modulation rate / recording power (= γ value) becomes the optimum value.

【0008】変調率を測定する方法として、図15に示
すようにRF信号をACカップリングした信号(AC成
分信)をピーク検出回路2に入力し、ピーク検出回路2
から出力されるピーク電圧をAD変換器5で変換したピ
ーク値(A1)と、同じくRF信号のAC成分信号をボ
トム検出回路3に入力し、ボトム検出回路3から出力さ
れるボトム電圧をAD変換器5で変換したボトム値(A
2)と、RF信号に含まれるDC成分を検出するための
DC検出回路4から出力されるDC電圧をAD変換器5
で変換した値(DC)を測定し、制御演算部(図示しな
い)によって変調率mを(数2)によって演算し、
As a method of measuring the modulation rate, a signal obtained by AC coupling an RF signal (AC component signal) is input to the peak detection circuit 2 as shown in FIG.
The peak value (A1) converted from the peak voltage output from the AD converter 5 and the AC component signal of the RF signal are input to the bottom detection circuit 3, and the bottom voltage output from the bottom detection circuit 3 is AD converted. Bottom value (A
2), and the DC voltage output from the DC detection circuit 4 for detecting the DC component included in the RF signal is converted into an AD converter 5
The value (DC) converted in step (3) is measured, and the modulation factor m is calculated by (Equation 2) by the control calculator (not shown).

【0009】[0009]

【数2】 [Equation 2]

【0010】さらに記録パワをPwとして、(数3)に
よってγ値を求めている。
Further, the recording power is set as Pw, and the γ value is obtained by the equation (3).

【0011】[0011]

【数3】 [Equation 3]

【0012】従って、CD−RWやDVD−RWでは、
最適パワ制御を行う制御方法として、図16のフローチ
ャートに示すようにディスクに規定されたパワキャリブ
レーション領域に移動し(S111)、記録パワを変化
させながら記録を行う(S112)。次に、記録を開始
した場所に戻り、RF信号の測定及びm値,γ値の演算
を行いながら信号の再生を行い(S113)、最適なγ
値となったときの記録パワを最適な記録パワとして学習
する(S114)、という手順で最適パワ制御を行って
いる。
Therefore, in the CD-RW and the DVD-RW,
As a control method for performing the optimum power control, as shown in the flowchart of FIG. 16, the disc is moved to a power calibration area defined on the disc (S111), and recording is performed while changing the recording power (S112). Next, returning to the place where the recording is started, the signal is reproduced while the RF signal is measured and the m value and the γ value are calculated (S113).
The optimum power control is performed by the procedure of learning the recording power when the value becomes a value as the optimum recording power (S114).

【0013】[0013]

【発明が解決しようとする課題】ところで、光ディスク
装置においては、以上説明したβ値,γ値に関してかな
り高精度な測定を要求される。しかし、図13,図15
に示すピーク検出回路やボトム検出回路には、内部ゲイ
ンのバラツキや回路オフセット、またAD変換器のチャ
ンネル間のバラツキ等があり、これらに起因してβ値や
γ値の測定が正確でない場合も起こり、このような場合
には、例え最適パワだと思われるパワで書き込みを行っ
ても、正確に書き込めないという課題があった。
By the way, in the optical disk device, the β value and the γ value described above are required to be measured with extremely high accuracy. However, FIG. 13 and FIG.
The peak detection circuit and the bottom detection circuit shown in (1) have variations in internal gain, circuit offset, variations between channels of the AD converter, etc., which may cause inaccurate measurement of β value and γ value. In such a case, there is a problem that even if the writing is performed with the power that is considered to be the optimum power, the writing cannot be performed accurately.

【0014】そこで、従来の課題を解決するために本発
明は、β値とγ値の測定精度にかかわらず正確な最適パ
ワ学習を行うことができる光ディスク装置を提供するこ
とを目的とする。
Therefore, in order to solve the conventional problems, it is an object of the present invention to provide an optical disk device capable of performing accurate optimum power learning regardless of the measurement accuracy of the β value and the γ value.

【0015】また本発明は、正確に最適パワを学習でき
る光ディスク装置の最適パワ制御方法を提供することを
目的とする。
Another object of the present invention is to provide an optimum power control method for an optical disk device which can learn the optimum power accurately.

【0016】[0016]

【課題を解決するための手段】上記した従来の課題を解
決するために本発明の光ディスク装置は、ピーク電圧と
ボトム電圧を検出する前に、切り替えスイッチを切り替
えることよってDA変換器からピーク検出回路とボトム
検出回路に電圧を印加してそれぞれの回路特性を求め、
ピーク電圧とボトム電圧を検出するときには、切り替え
スイッチを切り替えてピーク電圧とボトム電圧を測定
し、回路特性に基づいて補正してβ値を演算することを
特徴とする。これにより、β値とγ値の測定精度にかか
わらず正確な最適パワ学習を行うことができる。
In order to solve the above-mentioned conventional problems, the optical disk device of the present invention uses the DA converter to change the peak detection circuit by switching the changeover switch before detecting the peak voltage and the bottom voltage. By applying a voltage to the bottom detection circuit and the circuit characteristics of each,
When detecting the peak voltage and the bottom voltage, the changeover switch is switched to measure the peak voltage and the bottom voltage, and the β value is calculated by correction based on the circuit characteristics. As a result, accurate optimum power learning can be performed regardless of the measurement accuracy of the β value and the γ value.

【0017】また、本発明の光ディスク装置の最適パワ
制御方法は、ピーク電圧とボトム電圧を検出する前に、
DA変換器からピーク検出回路とボトム検出回路に電圧
を印加してそれぞれの回路特性を求め、ピーク電圧とボ
トム電圧を検出するときには、ピーク電圧とボトム電圧
を測定し、回路特性に基づいて補正してβ値を演算する
ことを特徴とする。これにより、正確に最適パワを学習
できる。
Further, according to the optimum power control method of the optical disk device of the present invention, before the peak voltage and the bottom voltage are detected,
Voltages are applied from the DA converter to the peak detection circuit and the bottom detection circuit to obtain the respective circuit characteristics. When detecting the peak voltage and the bottom voltage, the peak voltage and the bottom voltage are measured and corrected based on the circuit characteristics. It is characterized by calculating the β value. As a result, the optimum power can be learned accurately.

【0018】[0018]

【発明の実施の形態】請求項1に記載された発明は、R
F信号のAC成分信号が入力され、そのピーク電圧を出
力するピーク検出回路と、RF信号にAC成分信号が入
力され、そのボトム電圧を出力するボトム検出回路と、
ピーク電圧とボトム電圧を測定するためのAD変換器
と、ピーク検出回路とボトム検出回路の回路特性を測定
するためにそれぞれに電圧を加えることができるDA変
換器と、ピーク検出回路とボトム検出回路をコンデンサ
またはDA変換器の一方と選択的に接続できる切り替え
スイッチとを備え、制御演算部が、ピーク電圧とボトム
電圧を検出する前に、切り替えスイッチを切り替えるこ
とよってDA変換器からピーク検出回路とボトム検出回
路に電圧を印加してそれぞれの回路特性を求め、ピーク
電圧とボトム電圧を検出するときには、切り替えスイッ
チを切り替えてピーク電圧とボトム電圧を測定し、回路
特性に基づいて補正してβ値を演算することを特徴とす
る光ディスク装置であるから、色素系の光ディスクに対
して、ピーク検出回路やボトム検出回路にバラツキ等が
あっても、回路特性を基に測定結果を補正してβ値を演
算するため高精度のβ値測定が可能になり、最適パワで
書き込みを行うことができる。
BEST MODE FOR CARRYING OUT THE INVENTION The invention described in claim 1 is R
A peak detection circuit that receives the AC component signal of the F signal and outputs its peak voltage; a bottom detection circuit that receives the AC component signal of the RF signal and outputs its bottom voltage;
AD converter for measuring peak voltage and bottom voltage, DA converter capable of applying voltage to each for measuring circuit characteristics of peak detection circuit and bottom detection circuit, peak detection circuit and bottom detection circuit And a changeover switch that can be selectively connected to either the capacitor or the DA converter, and the control operation unit switches the changeover switch before detecting the peak voltage and the bottom voltage to change the DA converter to the peak detection circuit. When the voltage is applied to the bottom detection circuit to obtain the respective circuit characteristics and the peak voltage and the bottom voltage are detected, the changeover switch is switched to measure the peak voltage and the bottom voltage, and the β value is corrected based on the circuit characteristics. Since the optical disc device is characterized by calculating Or even variations etc. there the bottom detection circuit enables high-precision β value measurement for calculating the β value by correcting the measurement result based on circuit characteristics can be written in the optimum power.

【0019】請求項2に記載された発明は、RF信号の
AC成分信号が入力され、そのピーク電圧を出力するピ
ーク検出回路と、RF信号にAC成分信号が入力され、
そのボトム電圧を出力するボトム検出回路と、RF信号
のDC成分を測定してDC電圧を出力するDC検出回路
と、ピーク電圧とボトム電圧とDC電圧を測定するため
のAD変換器と、ピーク検出回路とボトム検出回路の回
路特性を測定するためにそれぞれに電圧を加えることが
できるDA変換器と、ピーク検出回路とボトム検出回路
をコンデンサまたはDA変換器の一方と選択的に接続で
きる第1切り替えスイッチと、RF信号またはDA変換
器の出力の一方を選択的にDC変換回路に入力できる第
2切り替えスイッチを備え、制御演算部が、ピーク電
圧,ボトム電圧,DC電圧を検出する前に、第1切り替
えスイッチと第2切り替えスイッチを切り替えることに
よってDA変換器からピーク検出回路,ボトム検出回
路,DC検出回路に電圧を印加してそれぞれの回路特性
を求め、ピーク電圧,ボトム電圧,DC電圧を検出する
ときには、第1切り替えスイッチと第2切り替えスイッ
チを切り替えてピーク電圧,ボトム電圧,DC電圧を測
定し、回路特性に基づいて補正してγ値を演算すること
を特徴とする光ディスク装置であるから、相変化系の光
ディスクに対して、ピーク検出回路やボトム検出回路に
バラツキ、DC検出回路のチャンネル間にバラツキがあ
っても、回路特性を基に測定結果を補正してγ値を演算
するため高精度のγ値測定が可能になり、最適パワで書
き込みを行うことができる。
According to a second aspect of the present invention, an AC component signal of the RF signal is input, a peak detection circuit that outputs the peak voltage thereof, and an AC component signal is input to the RF signal.
A bottom detection circuit that outputs the bottom voltage, a DC detection circuit that measures the DC component of the RF signal and outputs the DC voltage, an AD converter that measures the peak voltage, the bottom voltage, and the DC voltage, and peak detection A DA converter that can apply a voltage to each of the circuit and the bottom detection circuit to measure the circuit characteristics, and a first switch that can selectively connect the peak detection circuit and the bottom detection circuit to either the capacitor or the DA converter. A switch and a second changeover switch capable of selectively inputting one of the RF signal and the output of the DA converter to the DC conversion circuit are provided, and before the control calculation unit detects the peak voltage, the bottom voltage, and the DC voltage, By switching between the 1st changeover switch and the 2nd changeover switch, the DA converter supplies power to the peak detection circuit, the bottom detection circuit, and the DC detection circuit. When the peak voltage, the bottom voltage, and the DC voltage are detected by applying the voltage, the peak voltage, the bottom voltage, and the DC voltage are measured by switching the first changeover switch and the second changeover switch. Since the optical disc device is characterized in that the γ value is calculated based on the correction, the peak detection circuit and the bottom detection circuit have variations in the phase change type optical disc, and the channels of the DC detection circuit have variations. Even if there is, the γ value is calculated by correcting the measurement result based on the circuit characteristics, so that the γ value can be measured with high accuracy, and the writing can be performed with the optimum power.

【0020】請求項3に記載された発明は、RF信号の
AC成分信号が入力され、そのピーク電圧を出力するピ
ーク検出回路と、RF信号にAC成分信号が入力され、
そのボトム電圧を出力するボトム検出回路と、ピーク電
圧とボトム電圧を測定するためのAD変換器と、ピーク
検出回路とボトム検出回路の回路特性を測定するために
それぞれに電圧を加えることができるDA変換器と、R
F信号またはコンデンサでAC成分信号の一方を選択す
ることができる第3切り替えスイッチと、ピーク検出回
路とボトム検出回路を第3切り替えスイッチの出力側ま
たはDA変換器の一方に選択的に接続できる第4切り替
えスイッチとを備え、制御演算部が、ピーク電圧とボト
ム電圧を検出する前に、第4切り替えスイッチを切り替
えることよってDA変換器からピーク検出回路とボトム
検出回路に電圧を印加してそれぞれの回路特性を求め、
β値を測定するときには、第3切り替えスイッチと第4
切り替えスイッチを切り替えて、AC成分信号をピーク
検出回路とボトム検出回路に入力してピーク電圧とボト
ム電圧を測定し、回路特性に基づいて補正してβ値を演
算し、γ値を測定するときには、RF信号をピーク検出
回路とボトム検出回路に入力してピーク電圧とボトム電
圧を測定し、回路特性に基づいて補正してγ値を演算す
ることを特徴とする光ディスク装置であるから、色素形
の光ディスクと相変化系の光ディスクのいずれに対して
も最適パワ制御でき、ピーク検出回路やボトム検出回
路、DC検出回路にバラツキ等があっても、回路特性を
基に測定結果を補正してβ値、γ値を演算するため高精
度のβ値、γ値の測定が可能になり、最適パワで書き込
みを行うことができる。
According to a third aspect of the present invention, an AC component signal of the RF signal is input and a peak detection circuit that outputs the peak voltage thereof, and an AC component signal is input to the RF signal,
A bottom detection circuit that outputs the bottom voltage, an AD converter that measures the peak voltage and the bottom voltage, and a DA that can apply a voltage to each to measure the circuit characteristics of the peak detection circuit and the bottom detection circuit Converter and R
A third changeover switch capable of selecting one of the AC component signal with the F signal or the capacitor, and a third changeover switch capable of selectively connecting the peak detection circuit and the bottom detection circuit to the output side of the third changeover switch or one of the DA converters. The control operation unit switches the fourth changeover switch to apply a voltage from the DA converter to the peak detection circuit and the bottom detection circuit before detecting the peak voltage and the bottom voltage. Find circuit characteristics,
When measuring the β value, the third selector switch and the fourth
When the changeover switch is switched, the AC component signal is input to the peak detection circuit and the bottom detection circuit to measure the peak voltage and the bottom voltage, the β value is calculated by correction based on the circuit characteristics, and the γ value is measured. Since the RF signal is input to the peak detection circuit and the bottom detection circuit to measure the peak voltage and the bottom voltage, and the γ value is calculated by correcting the peak voltage and the bottom voltage, the dye type is used. Optimal power control is possible for both the optical discs of the above and the optical discs of the phase change system, and even if there are variations in the peak detection circuit, the bottom detection circuit, the DC detection circuit, etc., the measurement result is corrected based on the circuit characteristics and β Since the values and γ values are calculated, highly accurate β and γ values can be measured, and writing can be performed with optimum power.

【0021】請求項4に記載された発明は、ピーク電圧
とボトム電圧を検出する前に、DA変換器からピーク検
出回路とボトム検出回路に電圧を印加してそれぞれの回
路特性を求め、ピーク電圧とボトム電圧を検出するとき
には、ピーク電圧とボトム電圧を測定し、回路特性に基
づいて補正してβ値を演算することを特徴とする光ディ
スク装置のパワ制御方法であるから、色素系の光ディス
クに対して、ピーク検出回路やボトム検出回路にバラツ
キ等があっても、回路特性を基に測定結果を補正してβ
値を演算するため高精度のβ値測定が可能になり、最適
パワで書き込みを行うことができる。
According to the invention described in claim 4, before the peak voltage and the bottom voltage are detected, a voltage is applied from the DA converter to the peak detection circuit and the bottom detection circuit to obtain respective circuit characteristics, and the peak voltage is calculated. When detecting the bottom voltage, the peak voltage and the bottom voltage are measured, and the β value is calculated by correcting the peak voltage and the bottom voltage, and the β value is calculated. On the other hand, even if there are variations in the peak detection circuit and the bottom detection circuit, the measurement result is corrected based on the circuit characteristics and β
Since the value is calculated, the β value can be measured with high accuracy, and writing can be performed with optimum power.

【0022】請求項5に記載された発明は、ピーク電
圧,ボトム電圧,DC電圧を検出する前に、DA変換器
からピーク検出回路,ボトム検出回路,DC検出回路に
電圧を印加してそれぞれの回路特性を求め、ピーク電
圧,ボトム電圧,DC電圧を検出するときには、ピーク
電圧,ボトム電圧,DC電圧を測定し、回路特性に基づ
いて補正してγ値を演算することを特徴とする光ディス
ク装置のパワ制御方法であるから、ピーク検出回路やボ
トム検出回路にバラツキ、DC検出回路のチャンネル間
にバラツキがあっても、回路特性を基に測定結果を補正
してγ値を演算するため高精度のγ値測定が可能にな
り、最適パワで書き込みを行うことができる。
In the invention described in claim 5, before detecting the peak voltage, the bottom voltage and the DC voltage, the voltage is applied from the DA converter to the peak detection circuit, the bottom detection circuit and the DC detection circuit, respectively. When obtaining the circuit characteristics and detecting the peak voltage, the bottom voltage, and the DC voltage, the peak voltage, the bottom voltage, and the DC voltage are measured and corrected based on the circuit characteristics to calculate the γ value. Since this is a power control method, even if there are variations in the peak detection circuit and the bottom detection circuit and variations in the channels of the DC detection circuit, the measurement result is corrected based on the circuit characteristics and the γ value is calculated, resulting in high accuracy. It becomes possible to measure the γ value, and writing can be performed with optimum power.

【0023】請求項6に記載された発明は、ピーク電圧
とボトム電圧を検出する前に、DA変換器からピーク検
出回路とボトム検出回路に電圧を印加してそれぞれの回
路特性を求め、β値を測定するときには、RF信号のA
C成分信号をピーク検出回路とボトム検出回路に入力し
てピーク電圧とボトム電圧を測定し、回路特性に基づい
て補正してβ値を演算し、γ値を測定するときには、R
F信号をピーク検出回路とボトム検出回路に入力してピ
ーク電圧とボトム電圧を測定し、回路特性に基づいて補
正してγ値を演算することを特徴とする光ディスク装置
のパワ制御方法であるから、色素形の光ディスクと相変
化系の光ディスクのいずれに対しても最適パワ制御で
き、ピーク検出回路やボトム検出回路、DC検出回路に
バラツキ等があっても、回路特性を基に測定結果を補正
してβ値、γ値を演算するため高精度のβ値、γ値の測
定が可能になり、最適パワで書き込みを行うことができ
る。
In the invention described in claim 6, before detecting the peak voltage and the bottom voltage, a voltage is applied from the DA converter to the peak detection circuit and the bottom detection circuit to obtain respective circuit characteristics, and the β value is obtained. When measuring the
When the C component signal is input to the peak detection circuit and the bottom detection circuit, the peak voltage and the bottom voltage are measured, the β value is calculated by correction based on the circuit characteristics, and the γ value is measured, R
This is a power control method for an optical disk device characterized in that the F signal is inputted to the peak detection circuit and the bottom detection circuit to measure the peak voltage and the bottom voltage, and the γ value is calculated by correcting based on the circuit characteristics. Optimal power control is possible for both dye type optical discs and phase change type optical discs, and even if there are variations in the peak detection circuit, bottom detection circuit, DC detection circuit, etc., the measurement results are corrected based on the circuit characteristics. Since the β value and the γ value are calculated, the highly accurate β value and the γ value can be measured, and the writing can be performed with the optimum power.

【0024】(実施の形態1)本発明の実施の形態1の
光ディスク装置とその最適パワ制御方法について説明す
る。図1は本発明の実施の形態1における光ディスク装
置の回路構成図である。
(Embodiment 1) An optical disk device according to Embodiment 1 of the present invention and an optimum power control method thereof will be described. 1 is a circuit configuration diagram of an optical disk device according to a first embodiment of the present invention.

【0025】図1において、1は回路のオフセットを除
くためのACカップリングを行うコンデンサ、2はピー
ク検出回路、3はボトム検出回路、5はピーク電圧を測
定するためのAD変換器、7はピーク検出回路2及びボ
トム検出回路3と、RF側またはDA変換器8側の一方
を切り替える切り替えスイッチ、8はDA変換器であ
る。本実施の形態1の光ディスク装置は、図示はしない
が制御演算部を備えており、制御演算部が最適パワ制御
を行うために切り替えスイッチの切り替えや、回路特性
やβ値の演算を行う。
In FIG. 1, 1 is a capacitor for AC coupling to remove the offset of the circuit, 2 is a peak detection circuit, 3 is a bottom detection circuit, 5 is an AD converter for measuring the peak voltage, and 7 is A changeover switch for switching between the peak detection circuit 2 and the bottom detection circuit 3 and one of the RF side and the DA converter 8 side, and 8 is a DA converter. Although not shown, the optical disk device of the first embodiment includes a control calculation unit, and the control calculation unit switches the changeover switch and calculates the circuit characteristic and β value in order to perform optimum power control.

【0026】ディスクから読み出されたRF信号は、コ
ンデンサ1によってACカップリングしてピーク検出回
路2に入力され、ピーク検出回路2から出力されるピー
ク電圧を測定するためにAD変換器5に入力される。同
じく、RF信号はACカップリングしてボトム検出回路
3に入力され、ボトム検出回路3から出力されるボトム
電圧を測定するためにAD変換器5に入力される。
The RF signal read from the disk is AC-coupled by the capacitor 1 and is input to the peak detection circuit 2, and is input to the AD converter 5 to measure the peak voltage output from the peak detection circuit 2. To be done. Similarly, the RF signal is AC-coupled and input to the bottom detection circuit 3, and is input to the AD converter 5 to measure the bottom voltage output from the bottom detection circuit 3.

【0027】このコンデンサ1とピーク検出回路2,ボ
トム検出回路3の間に切り替えスイッチ7が設けられ、
DA変換器8からの出力をピーク検出回路2とボトム検
出回路3の一方に選択的に入力できるように構成されて
いる。
A changeover switch 7 is provided between the capacitor 1 and the peak detection circuit 2 and the bottom detection circuit 3.
The output from the DA converter 8 is selectively input to one of the peak detection circuit 2 and the bottom detection circuit 3.

【0028】β値の測定の手順としては、まずピーク検
出とボトム検出を行う前に、制御演算部が切り替えスイ
ッチをDA変換器8側に切り替え、DA出力電圧として
任意の電圧を加え、予めピーク検出回路2とボトム検出
回路3の回路特性を求めておく必要がある。
As a procedure for measuring the β value, first, before performing peak detection and bottom detection, the control calculation unit switches the changeover switch to the DA converter 8 side, adds an arbitrary voltage as the DA output voltage, and peaks in advance. It is necessary to obtain the circuit characteristics of the detection circuit 2 and the bottom detection circuit 3.

【0029】この回路特性測定は次のような手順で行
う。図2は本発明の実施の形態1における光ディスク装
置の回路特性測定フローチャート、図3は本発明の実施
の形態1における光ディスク装置の回路特性測定におけ
る関係図である。図2に示すように、制御演算部が切り
替えスイッチ7をDA変換器8側に切り替える(S
1)。DA変換器8がDA値としてDA1を出力したと
きのピーク検出回路2からの出力電圧(Peak#da1)、ボ
トム検出回路3からの出力電圧(Bottom#da1)をAD変
換器5で測定し(S2)、次に、DA値として、DA2
を出力したときのピーク検出回路2からの出力電圧(Pe
ak#da2)、ボトム検出回路3からの出力電圧(Bottom#d
a2)をAD変換器5で測定する(S3)。このステップ
S2,ステップS3における測定結果から、図3に示す
ようにピーク検出回路特性(数4),ボトム検出回路特
性(数5)を求める(S4)。
This circuit characteristic measurement is performed by the following procedure. FIG. 2 is a circuit characteristic measurement flowchart of the optical disk device according to the first embodiment of the present invention, and FIG. 3 is a relationship diagram in the circuit characteristic measurement of the optical disk device according to the first embodiment of the present invention. As shown in FIG. 2, the control calculation unit switches the changeover switch 7 to the DA converter 8 side (S
1). The output voltage (Peak # da1) from the peak detection circuit 2 and the output voltage (Bottom # da1) from the bottom detection circuit 3 when the DA converter 8 outputs DA1 as the DA value are measured by the AD converter 5 ( S2), then DA2 as DA value
Output voltage from the peak detection circuit 2 (Pe
ak # da2), the output voltage from the bottom detection circuit 3 (Bottom # d
a2) is measured by the AD converter 5 (S3). From the measurement results in steps S2 and S3, the peak detection circuit characteristic (Equation 4) and the bottom detection circuit characteristic (Equation 5) are obtained as shown in FIG. 3 (S4).

【0030】[0030]

【数4】 [Equation 4]

【0031】[0031]

【数5】 [Equation 5]

【0032】続いて、RF信号をコンデンサ1によって
ACカップリングしてピーク検出回路2とボトム検出回
路3に入力し、測定した結果を制御演算部がこの回路特
性を基に補正してβ値を演算する。図4は本発明の実施
の形態1における光ディスク装置のβ値演算フローチャ
ートである。β値の測定の手順は、図4に示すように、
制御演算部がまず切り替えスイッチ7をACカップリン
グ側のRF信号に切り替える(S11)。RF信号にA
Cカップリングを行った信号をピーク検出回路2に入力
し、ピーク検出回路2から出力されるピーク電圧をAD
変換器5で変換したピーク値(A1)を測定する(S1
2)。同様に、RF信号にACカップリングを行った信
号をボトム検出回路3に入力し、ボトム検出回路3から
出力されるボトム電圧をAD変換器で変換したボトム値
(A2)を測定する(S13)。回路特性測定において
求めた係数a,b,c,d及び測定したA1,A2によ
り、(数6)の値をβ値とする(S14)。
Subsequently, the RF signal is AC-coupled by the capacitor 1 and is input to the peak detection circuit 2 and the bottom detection circuit 3, and the measurement result is corrected by the control arithmetic unit based on this circuit characteristic to obtain the β value. Calculate FIG. 4 is a β value calculation flowchart of the optical disk device according to the first embodiment of the present invention. The β value measurement procedure is as shown in FIG.
The control calculation unit first switches the changeover switch 7 to the RF signal on the AC coupling side (S11). A to RF signal
The C-coupled signal is input to the peak detection circuit 2 and the peak voltage output from the peak detection circuit 2 is AD
The peak value (A1) converted by the converter 5 is measured (S1)
2). Similarly, a signal obtained by AC coupling the RF signal is input to the bottom detection circuit 3, and the bottom value (A2) obtained by converting the bottom voltage output from the bottom detection circuit 3 by the AD converter is measured (S13). . Based on the coefficients a, b, c, d obtained in the circuit characteristic measurement and the measured A1, A2, the value of (Equation 6) is set as the β value (S14).

【0033】[0033]

【数6】 [Equation 6]

【0034】以上説明したように、実施の形態1の光デ
ィスク装置とその最適パワ制御方法は、CD−RやDV
D−R等のような色素系の光ディスクに対して、ピーク
検出回路2やボトム検出回路3にバラツキ等があって
も、回路特性を基に測定結果を補正してβ値を演算する
ため高精度のβ値測定が可能になり、最適パワで書き込
みを行うことができる。
As described above, the optical disk device and the optimum power control method therefor according to the first embodiment are the same as those for the CD-R and DV.
Even if there are variations in the peak detection circuit 2 and the bottom detection circuit 3 for a dye-based optical disc such as D-R, the measurement result is corrected based on the circuit characteristics to calculate the β value, which is high. It becomes possible to measure the β value with accuracy, and writing can be performed with optimum power.

【0035】(実施の形態2)本発明の実施の形態2の
光ディスク装置とその最適パワ制御方法について説明す
る。図5は本発明の実施の形態2における光ディスク装
置の回路構成図である。図5において、1はACカップ
リングを行うコンデンサ、2はピーク検出回路、3はボ
トム検出回路、4はDC検出回路、5はピーク電圧を測
定するためのAD変換器、7aは、ピーク検出回路2及
びボトム検出回路3とRF側またはDA変換器8側の一
方とを切り替える切り替えスイッチ(本発明の第1切り
替えスイッチ)である。7bは、DC検出回路4とRF
側またはDA変換器8側の一方とを切り替える切り替え
スイッチ(本発明の第2切り替えスイッチ)である。8
はDA変換器である。本実施の形態2の光ディスク装置
も図示はしないが制御演算部を備えており、制御演算部
が最適パワ制御を行うために切り替えスイッチ7a,7
bの切り替えや、回路特性やγ値の演算を行う。
(Embodiment 2) An optical disk device according to Embodiment 2 of the present invention and an optimum power control method thereof will be described. FIG. 5 is a circuit configuration diagram of an optical disk device according to the second embodiment of the present invention. In FIG. 5, 1 is a capacitor for AC coupling, 2 is a peak detection circuit, 3 is a bottom detection circuit, 4 is a DC detection circuit, 5 is an AD converter for measuring the peak voltage, and 7a is a peak detection circuit. 2 and a bottom detection circuit 3 and a changeover switch (first changeover switch of the present invention) for switching between the RF side or the DA converter 8 side. 7b is a DC detection circuit 4 and RF
It is a changeover switch (the second changeover switch of the present invention) for switching between one of the side and the DA converter 8 side. 8
Is a DA converter. Although not shown, the optical disk device according to the second embodiment also includes a control arithmetic unit, and the changeover switches 7a, 7a are used for the control arithmetic unit to perform optimum power control.
b is switched, and circuit characteristics and γ values are calculated.

【0036】図5に示すように、RF信号は、コンデン
サ1と切り替えスイッチ7aを介してピーク検出回路2
に入力され、ピーク検出回路2から出力されるピーク電
圧を測定するためにAD変換器5に入力される。同じ
く、RF信号はコンデンサ1と切り替えスイッチ7aを
介してボトム検出回路3に入力され、ボトム検出回路3
から出力されるボトム電圧を測定するためにAD変換器
5に入力される。
As shown in FIG. 5, the RF signal is transmitted through the capacitor 1 and the changeover switch 7a to the peak detection circuit 2
Is input to the AD converter 5 to measure the peak voltage output from the peak detection circuit 2. Similarly, the RF signal is input to the bottom detection circuit 3 via the capacitor 1 and the changeover switch 7a, and the bottom detection circuit 3
Is input to the AD converter 5 to measure the bottom voltage output from the.

【0037】さらに、RF信号のDC成分を測定するた
めにRF信号は切り替えスイッチ7bを介してDC検出
回路4に入力され、DC検出回路4から出力されるDC
電圧を測定するためにAD変換器5に入力される。
Further, in order to measure the DC component of the RF signal, the RF signal is input to the DC detection circuit 4 via the changeover switch 7b and output from the DC detection circuit 4.
It is input to the AD converter 5 to measure the voltage.

【0038】γ値の測定の手順としては、まずピーク検
出,ボトム検出,DC検出を行う前に、制御演算部が切
り替えスイッチ7a,7bをDA変換器8側に切り替
え、DA出力電圧として任意の電圧を加え、予めピーク
検出回路2とボトム検出回路3、DC検出回路4の回路
特性を求めておく必要がある。この回路特性を基にRF
信号にコンデンサ1でACカップリングを行った信号を
測定した結果と、RF信号のDC成分を直接測定した結
果によって補正してγ値を演算するものである。
As the procedure for measuring the γ value, first, before performing peak detection, bottom detection, and DC detection, the control calculation unit switches the changeover switches 7a and 7b to the DA converter 8 side to set any DA output voltage. It is necessary to apply a voltage and obtain the circuit characteristics of the peak detection circuit 2, the bottom detection circuit 3, and the DC detection circuit 4 in advance. RF based on this circuit characteristic
The γ value is calculated by correcting the signal obtained by AC coupling the signal with the capacitor 1 and the result obtained by directly measuring the DC component of the RF signal.

【0039】この回路特性測定は次のような手順で行
う。図6は本発明の実施の形態2における光ディスク装
置の回路特性測定フローチャートである。図6に示すよ
うに、制御演算部が切り替えスイッチ7a,7bをDA
変換器8側に切り替える(S21)。DA変換器8がD
A値としてDA1を出力したときのピーク検出回路2か
らの出力電圧(Peak#da1)、ボトム検出回路3からの出
力電圧(Bottom#da1)、DC検出回路4からの出力電圧
(DC#da1)をAD変換器5で測定する(S22)。次
に、DA値としてDA2を出力したときのピーク検出回
路2からの出力電圧(Peak#da2)、ボトム検出回路3か
らの出力電圧(Bottom#da2)、DC検出回路4からの出
力電圧(DC#da2)をAD変換器5で測定する(S2
3)。このステップS22,ステップS23における測
定結果から、図7に示すようにピーク検出回路特性(数
4)、ボトム検出回路特性(数5)、DC検出回路特性
(数7)を求める(S24)。
This circuit characteristic measurement is performed by the following procedure. FIG. 6 is a circuit characteristic measurement flowchart of the optical disk device according to the second embodiment of the present invention. As shown in FIG. 6, the control arithmetic unit sets the changeover switches 7a and 7b to DA.
Switch to the converter 8 side (S21). DA converter 8 is D
Output voltage (Peak # da1) from the peak detection circuit 2 when DA1 is output as the A value, output voltage from the bottom detection circuit 3 (Bottom # da1), output voltage from the DC detection circuit 4 (DC # da1) Is measured by the AD converter 5 (S22). Next, when DA2 is output as the DA value, the output voltage from the peak detection circuit 2 (Peak # da2), the output voltage from the bottom detection circuit 3 (Bottom # da2), the output voltage from the DC detection circuit 4 (DC # da2) is measured by the AD converter 5 (S2
3). From the measurement results in steps S22 and S23, the peak detection circuit characteristic (Equation 4), the bottom detection circuit characteristic (Equation 5), and the DC detection circuit characteristic (Equation 7) are obtained as shown in FIG. 7 (S24).

【0040】[0040]

【数7】 [Equation 7]

【0041】続いて、RF信号を直接DC検出回路4に
入力し、RF信号をACカップリングしてピーク検出回
路2とボトム検出回路3とに入力し、測定した結果を制
御演算部がこの回路特性を基に補正してγ値を演算す
る。図7は本発明の実施の形態2における光ディスク装
置の回路特性測定における関係図、図8は本発明の実施
の形態2における光ディスク装置のγ値演算フローチャ
ートである。γ値の測定の手順は、図8に示すように、
制御演算部がまず切り替えスイッチ7a,7bをコンデ
ンサ1側のRF信号に切り替える(S31)。RF信号
にACカップリングを行った信号をピーク検出回路2に
入力し、ピーク検出回路2から出力されるピーク電圧を
AD変換器5で変換したピーク値(A1)を測定する
(S32)。同様に、RF信号にACカップリングを行
った信号をボトム検出回路3に入力し、ボトム検出回路
3から出力されるボトム電圧をAD変換器5で変換した
ボトム値(A2)を測定する(S33)。さらに、RF
信号のDC成分を測定するために、DC検出回路4から
出力されるDC電圧をAD変換器5で変換した値(D
C)を測定する(S34)。回路特性測定において求め
た係数a,b,d,e,f及び測定したA1,A2,D
Cにより、変調率m,記録パワPwとして(数8)、
(数3)で求める(S35)。
Subsequently, the RF signal is directly input to the DC detection circuit 4, the RF signal is AC-coupled and input to the peak detection circuit 2 and the bottom detection circuit 3, and the measurement result is measured by the control arithmetic unit. The γ value is calculated by making corrections based on the characteristics. FIG. 7 is a relationship diagram in the circuit characteristic measurement of the optical disc device according to the second embodiment of the present invention, and FIG. 8 is a γ value calculation flowchart of the optical disc device according to the second embodiment of the present invention. The procedure for measuring the γ value is as shown in FIG.
The control calculation unit first switches the changeover switches 7a and 7b to the RF signal on the side of the capacitor 1 (S31). The signal obtained by AC coupling the RF signal is input to the peak detection circuit 2, and the peak value (A1) obtained by converting the peak voltage output from the peak detection circuit 2 by the AD converter 5 is measured (S32). Similarly, a signal obtained by AC coupling the RF signal is input to the bottom detection circuit 3, and the bottom value (A2) obtained by converting the bottom voltage output from the bottom detection circuit 3 by the AD converter 5 is measured (S33). ). Furthermore, RF
To measure the DC component of the signal, the DC voltage output from the DC detection circuit 4 is converted by the AD converter 5 (D
C) is measured (S34). Coefficients a, b, d, e, f obtained in circuit characteristic measurement and measured A1, A2, D
By C, the modulation rate m, the recording power Pw (Equation 8),
It is calculated by (Equation 3) (S35).

【0042】[0042]

【数8】 [Equation 8]

【0043】以上説明したように、実施の形態2の光デ
ィスク装置とその最適パワ制御方法は、CD−RWやD
VD−RW等のような相変化系の光ディスクに対して、
ピーク検出回路2やボトム検出回路3にバラツキ、DC
検出回路4のチャンネル間にバラツキ等があっても、回
路特性を基に測定結果を補正してγ値を演算するため高
精度のγ値測定が可能になり、最適パワで書き込みを行
うことができる。
As described above, the optical disk device and the optimum power control method therefor according to the second embodiment are the same as those for the CD-RW and the D-RW.
For phase change type optical disks such as VD-RW,
Variation in peak detection circuit 2 and bottom detection circuit 3, DC
Even if there is a variation between the channels of the detection circuit 4, the measurement result is corrected based on the circuit characteristics to calculate the γ value, so that the γ value can be measured with high accuracy, and writing can be performed with optimum power. it can.

【0044】(実施の形態3)本発明の実施の形態3の
光ディスク装置とその最適パワ制御方法について説明す
る。図9は本発明の実施の形態3における光ディスク装
置の回路構成図である。
(Third Embodiment) An optical disk device and an optimum power control method therefor according to a third embodiment of the present invention will be described. FIG. 9 is a circuit configuration diagram of an optical disk device according to the third embodiment of the present invention.

【0045】1はACカップリングするためのコンデン
サ、2はピーク検出回路、3はボトム検出回路、5はピ
ーク電圧を測定するためのAD変換器、6はβ測定とγ
測定切り替えるためのACカップリングした信号とRF
信号とを切り替える切り替えスイッチ(本発明の第3切
り替えスイッチ)、7はピーク検出回路2及びボトム検
出回路3と、RF側またはDA変換器8側を切り替える
切り替えスイッチ(本発明の第4切り替えスイッチ)、
8はDA変換器である。本実施の形態3の光ディスク装
置も図示はしないが制御演算部を備えており、制御演算
部が最適パワ制御を行うために切り替えスイッチ6,7
の切り替えや、回路特性やβ値、γ値の演算を行う。
1 is a capacitor for AC coupling, 2 is a peak detection circuit, 3 is a bottom detection circuit, 5 is an AD converter for measuring the peak voltage, 6 is β measurement and γ.
AC coupled signal and RF for switching measurement
A changeover switch (third changeover switch of the present invention) for switching between a signal and a switch 7 for switching between the peak detection circuit 2 and the bottom detection circuit 3 and the RF side or the DA converter 8 side (the fourth changeover switch of the present invention). ,
Reference numeral 8 is a DA converter. Although not shown, the optical disk device of the third embodiment also includes a control calculation unit, and the changeover switches 6 and 7 are used for the control calculation unit to perform optimum power control.
Is switched, and circuit characteristics, β value, and γ value are calculated.

【0046】図9に示すように、RF信号は、コンデン
サ1と切り替えスイッチ6,切り替えスイッチ7を介し
てピーク検出回路2に入力され、ピーク検出回路2から
出力されるピーク電圧を測定するためにAD変換器5に
入力される。同じく、RF信号はコンデンサ1と切り替
えスイッチ6,7を介してボトム検出回路3に入力さ
れ、ボトム検出回路3から出力されるボトム電圧を測定
するためにAD変換器5に入力される。
As shown in FIG. 9, the RF signal is input to the peak detection circuit 2 via the capacitor 1, the changeover switch 6 and the changeover switch 7 to measure the peak voltage output from the peak detection circuit 2. It is input to the AD converter 5. Similarly, the RF signal is input to the bottom detection circuit 3 via the capacitor 1 and the changeover switches 6 and 7, and is input to the AD converter 5 to measure the bottom voltage output from the bottom detection circuit 3.

【0047】β値,γ値の測定の手順としては、まずピ
ーク検出とボトム検出を行う前に、制御演算部が切り替
えスイッチ7をDA変換器8側に切り替え、DA出力電
圧として任意の電圧を加え、予めピーク検出回路2とボ
トム検出回路3の回路特性を求めておく必要がある。こ
の回路特性を基に,β値を測定する場合には、スイッチ
6をACカップリング後(コンデンサ1の後)の信号
に、γ値を測定する場合には、スイッチ6をACカップ
リング前(コンデンサ1の前)のRF信号に切り替えて
測定を行い、この回路特性によって測定結果を補正し、
β値またはγ値を補正するものである。
As a procedure for measuring the β value and the γ value, first, before performing peak detection and bottom detection, the control calculation unit switches the changeover switch 7 to the DA converter 8 side, and an arbitrary voltage is set as the DA output voltage. In addition, it is necessary to obtain the circuit characteristics of the peak detection circuit 2 and the bottom detection circuit 3 in advance. On the basis of this circuit characteristic, when the β value is measured, the switch 6 is a signal after AC coupling (after the capacitor 1), and when the γ value is measured, the switch 6 is before the AC coupling ( Measurement is performed by switching to the RF signal (before the capacitor 1), and the measurement result is corrected by this circuit characteristic,
It is for correcting the β value or the γ value.

【0048】この回路特性測定は次のような手順で行
う。図10は本発明の実施の形態3における光ディスク
装置の回路特性測定フローチャート、図11は本発明の
実施の形態3における光ディスク装置の回路特性測定に
おける関係図である。
This circuit characteristic measurement is performed by the following procedure. FIG. 10 is a circuit characteristic measurement flowchart of the optical disc device according to the third embodiment of the present invention, and FIG. 11 is a relationship diagram in the circuit characteristic measurement of the optical disc device according to the third embodiment of the present invention.

【0049】図10に示すように、制御演算部が切り替
えスイッチ7をDA変換器8側に切り替える(S4
1)。DA変換器8がDA値としてDA1を出力したと
きのピーク検出回路2からの出力電圧(Peak#da1)、ボ
トム検出回路3からの出力電圧(Bottom#da1)をAD変
換器5で測定する(S42)。次に、DA値として、D
A2を出力したときのピーク検出回路2からの出力電圧
(Peak#da2)、ボトム検出回路3からの出力電圧(Bott
om#da2)をAD変換器5で測定する(S43)。このス
テップS42,ステップS43における測定結果から、
ピーク検出回路特性(数4)、ボトム検出回路特性(数
5)を求める(S44)。
As shown in FIG. 10, the control arithmetic unit switches the changeover switch 7 to the DA converter 8 side (S4).
1). The output voltage (Peak # da1) from the peak detection circuit 2 and the output voltage (Bottom # da1) from the bottom detection circuit 3 when the DA converter 8 outputs DA1 as the DA value are measured by the AD converter 5 ( S42). Next, as the DA value, D
Output voltage (Peak # da2) from the peak detection circuit 2 when A2 is output, output voltage from the bottom detection circuit 3 (Bott
om # da2) is measured by the AD converter 5 (S43). From the measurement results in steps S42 and S43,
The peak detection circuit characteristic (Equation 4) and the bottom detection circuit characteristic (Equation 5) are obtained (S44).

【0050】続いて、この回路特性を基にβ値とγ値測
定を行う場合の説明を行う。図12は本発明の実施の形
態3における光ディスク装置のβ値、γ値演算フローチ
ャートである。
Next, the case where the β value and the γ value are measured based on this circuit characteristic will be described. FIG. 12 is a β value / γ value calculation flowchart of the optical disk device according to the third embodiment of the present invention.

【0051】β値測定を行う場合には、図12に示すよ
うに制御演算部が切り替えスイッチ6をACカップリン
グ後の信号に切り替えるとともに、切り替えスイッチ7
をRF信号側が出力されるように切り替える(S5
1)。次に、RF信号にACカップリングを行った信号
をピーク検出回路2に入力し、ピーク検出回路2から出
力されるピーク電圧をAD変換器で変換したピーク値
(A1)を測定する(S52)。同様に、RF信号にA
Cカップリングを行った信号をボトム検出回路3に入力
し、ボトム検出回路3から出力されるボトム電圧をAD
変換器5で変換したボトム値(A2)を測定する(S5
3)。回路特性測定において求めた係数a,b,c,d
及び測定したA1,A2により、(数6)の値をβ値と
する(S54)。
When the β value is measured, the control calculation section switches the changeover switch 6 to the signal after AC coupling as shown in FIG.
Is switched so that the RF signal side is output (S5
1). Next, a signal obtained by AC coupling the RF signal is input to the peak detection circuit 2, and the peak value (A1) obtained by converting the peak voltage output from the peak detection circuit 2 by the AD converter is measured (S52). . Similarly, in the RF signal, A
The C-coupling signal is input to the bottom detection circuit 3, and the bottom voltage output from the bottom detection circuit 3 is AD.
The bottom value (A2) converted by the converter 5 is measured (S5
3). Coefficients a, b, c, d obtained in circuit characteristic measurement
The value of (Equation 6) is set as the β value based on the measured A1 and A2 (S54).

【0052】続いて、γ測定を行う場合には、制御演算
部が切り替えスイッチ6をACカップリング前のRF信
号に切り替えるとともに、スイッチ7をRF信号側が出
力されるように切り替える(S51)。ACカップリン
グされる前のRF信号をピーク検出回路2に入力し、ピ
ーク検出回路2から出力されるピーク電圧をAD変換器
5で変換したピーク値(A1)を測定する(S52)。
同様に、ACカップリングされる前のRF信号をボトム
検出回路3に入力し,ボトム検出回路3から出力される
ボトム電圧をAD変換器5で変換したボトム値(A2)
を測定する(S53)。回路特性測定において求めた係
数a,b,c,d及び測定したA1,A2により、変調
率m,記録パワPwとして(数9)、(数3)で求める
(S54)。
Subsequently, when the γ measurement is performed, the control arithmetic unit switches the changeover switch 6 to the RF signal before AC coupling and the switch 7 so that the RF signal side is output (S51). The RF signal before being AC-coupled is input to the peak detection circuit 2, and the peak value (A1) obtained by converting the peak voltage output from the peak detection circuit 2 by the AD converter 5 is measured (S52).
Similarly, a bottom value (A2) obtained by inputting the RF signal before AC coupling to the bottom detection circuit 3 and converting the bottom voltage output from the bottom detection circuit 3 by the AD converter 5
Is measured (S53). From the coefficients a, b, c, d obtained in the circuit characteristic measurement and the measured A1, A2, the modulation rate m and the recording power Pw are obtained by (Equation 9) and (Equation 3) (S54).

【0053】[0053]

【数9】 [Equation 9]

【0054】以上説明したように、実施の形態3の光デ
ィスク装置とその最適パワ制御方法は、色素形の光ディ
スクと相変化系の光ディスクのいずれに対しても最適パ
ワ制御でき、ピーク検出回路2やボトム検出回路3、D
C検出回路4にバラツキ等があっても、回路特性を基に
測定結果を補正してβ値、γ値を演算するため高精度の
β値、γ値の測定が可能になり、最適パワで書き込みを
行うことができる。
As described above, the optical disk apparatus and the optimum power control method therefor according to the third embodiment can perform optimum power control for both the dye type optical disk and the phase change type optical disk, and the peak detection circuit 2 and Bottom detection circuit 3, D
Even if there are variations in the C detection circuit 4, the measurement result is corrected based on the circuit characteristics to calculate the β value and the γ value, so that the β value and the γ value can be measured with high accuracy, and the optimum power can be obtained. Can write.

【0055】[0055]

【発明の効果】以上説明したように本発明の光ディスク
装置とその最適パワ制御方法によれば、高精度なβ値の
測定、γ値の測定を行うことができ、最適パワ学習を光
ディスクの種類や回路のバラツキ等に影響されずに可能
となる。また、色素形の光ディスクと相変化系の光ディ
スクのいずれに対しても、最適パワ制御することができ
る。
As described above, according to the optical disk device and the optimum power control method for the same of the present invention, it is possible to measure the β value and the γ value with high accuracy, and the optimum power learning is performed by the type of the optical disk. It is possible without being affected by the fluctuation of the circuit and the circuit. Further, the optimum power control can be performed on both the dye type optical disk and the phase change type optical disk.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施の形態1における光ディスク装置
の回路構成図
FIG. 1 is a circuit configuration diagram of an optical disc device according to a first embodiment of the present invention.

【図2】本発明の実施の形態1における光ディスク装置
の回路特性測定フローチャート
FIG. 2 is a circuit characteristic measurement flowchart of the optical disk device according to the first embodiment of the present invention.

【図3】本発明の実施の形態1における光ディスク装置
の回路特性測定における関係図
FIG. 3 is a relationship diagram in circuit characteristic measurement of the optical disc device according to the first embodiment of the present invention.

【図4】本発明の実施の形態1における光ディスク装置
のβ値演算フローチャート
FIG. 4 is a β value calculation flowchart of the optical disk device according to the first embodiment of the present invention.

【図5】本発明の実施の形態2における光ディスク装置
の回路構成図
FIG. 5 is a circuit configuration diagram of an optical disc device according to a second embodiment of the present invention.

【図6】本発明の実施の形態2における光ディスク装置
の回路特性測定フローチャート
FIG. 6 is a circuit characteristic measurement flowchart of the optical disk device according to the second embodiment of the present invention.

【図7】本発明の実施の形態2における光ディスク装置
の回路特性測定における関係図
FIG. 7 is a relationship diagram in circuit characteristic measurement of the optical disk device according to the second embodiment of the present invention.

【図8】本発明の実施の形態2における光ディスク装置
のγ値演算フローチャート
FIG. 8 is a γ value calculation flowchart of the optical disk device according to the second embodiment of the present invention.

【図9】本発明の実施の形態3における光ディスク装置
の回路構成図
FIG. 9 is a circuit configuration diagram of an optical disc device according to a third embodiment of the present invention.

【図10】本発明の実施の形態3における光ディスク装
置の回路特性測定フローチャート
FIG. 10 is a circuit characteristic measurement flowchart of the optical disk device according to the third embodiment of the present invention.

【図11】本発明の実施の形態3における光ディスク装
置の回路特性測定における関係図
FIG. 11 is a relationship diagram in circuit characteristic measurement of the optical disc device according to the third embodiment of the present invention.

【図12】本発明の実施の形態3における光ディスク装
置のβ値、γ値演算フローチャート
FIG. 12 is a β value / γ value calculation flowchart of the optical disk device according to the third embodiment of the present invention.

【図13】従来の光ディスク装置のβ値測定の回路構成
FIG. 13 is a circuit configuration diagram of β value measurement of a conventional optical disc device.

【図14】従来の光ディスク装置のβ値測定制御フロー
チャート
FIG. 14 is a β value measurement control flowchart of a conventional optical disc device.

【図15】従来の光ディスク装置のγ値測定の回路構成
FIG. 15 is a circuit configuration diagram of a γ value measurement of a conventional optical disc device.

【図16】従来の光ディスク装置のγ値測定制御フロー
チャート
FIG. 16 is a γ value measurement control flowchart of a conventional optical disk device.

【符号の説明】[Explanation of symbols]

1 コンデンサ 2 ピーク検出回路 3 ボトム検出回路 4 DC検出回路 5 AD変換器 6,7,7a,7b 切り替えスイッチ 8 DA変換器 1 capacitor 2 Peak detection circuit 3 Bottom detection circuit 4 DC detection circuit 5 AD converter 6,7,7a, 7b changeover switch 8 DA converter

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 5D090 AA01 CC01 CC05 EE01 EE11 HH01 KK03 LL08 5D119 AA11 AA23 BA01 HA16 HA48 HA50 HA57 HA68 5D789 AA11 AA23 BA01 HA16 HA48 HA50 HA57 HA68    ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5D090 AA01 CC01 CC05 EE01 EE11                       HH01 KK03 LL08                 5D119 AA11 AA23 BA01 HA16 HA48                       HA50 HA57 HA68                 5D789 AA11 AA23 BA01 HA16 HA48                       HA50 HA57 HA68

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】RF信号のAC成分信号が入力され、その
ピーク電圧を出力するピーク検出回路と、 前記RF信号に前記AC成分信号が入力され、そのボト
ム電圧を出力するボトム検出回路と、 前記ピーク電圧と前記ボトム電圧を測定するためのAD
変換器と、 前記ピーク検出回路と前記ボトム検出回路の回路特性を
測定するためにそれぞれに電圧を加えることができるD
A変換器と、 前記ピーク検出回路と前記ボトム検出回路を前記コンデ
ンサまたは前記DA変換器の一方と選択的に接続できる
切り替えスイッチとを備え、 制御演算部が、前記ピーク電圧と前記ボトム電圧を検出
する前に、前記切り替えスイッチを切り替えることよっ
て前記DA変換器から前記ピーク検出回路と前記ボトム
検出回路に電圧を印加してそれぞれの回路特性を求め、 前記ピーク電圧と前記ボトム電圧を検出するときには、
前記切り替えスイッチを切り替えて前記ピーク電圧と前
記ボトム電圧を測定し、前記回路特性に基づいて補正し
てβ値を演算することを特徴とする光ディスク装置。
1. A peak detection circuit which receives an AC component signal of an RF signal and outputs a peak voltage thereof; a bottom detection circuit which receives the AC component signal of the RF signal and outputs a bottom voltage thereof; AD for measuring the peak voltage and the bottom voltage
A converter and a voltage that can be applied to each of them to measure the circuit characteristics of the peak detection circuit and the bottom detection circuit.
An A converter, a changeover switch capable of selectively connecting the peak detection circuit and the bottom detection circuit to one of the capacitor and the DA converter, and the control calculation unit detects the peak voltage and the bottom voltage. Before, by applying a voltage from the DA converter to the peak detection circuit and the bottom detection circuit by switching the changeover switch to obtain the respective circuit characteristics, when detecting the peak voltage and the bottom voltage,
An optical disk device, wherein the changeover switch is changed over to measure the peak voltage and the bottom voltage, and the β value is calculated by making a correction based on the circuit characteristic.
【請求項2】RF信号のAC成分信号が入力され、その
ピーク電圧を出力するピーク検出回路と、 前記RF信号に前記AC成分信号が入力され、そのボト
ム電圧を出力するボトム検出回路と、 前記RF信号のDC成分を測定してDC電圧を出力する
DC検出回路と、 前記ピーク電圧と前記ボトム電圧と前記DC電圧を測定
するためのAD変換器と、 前記ピーク検出回路と前記ボトム検出回路の回路特性を
測定するためにそれぞれに電圧を加えることができるD
A変換器と、 前記ピーク検出回路と前記ボトム検出回路を前記コンデ
ンサまたは前記DA変換器の一方と選択的に接続できる
第1切り替えスイッチと、 前記RF信号または前記DA変換器の出力の一方を選択
的に前記DC変換回路に入力できる第2切り替えスイッ
チを備え、 制御演算部が、前記ピーク電圧,前記ボトム電圧,前記
DC電圧を検出する前に、前記第1切り替えスイッチと
前記第2切り替えスイッチを切り替えることによって前
記DA変換器から前記ピーク検出回路,前記ボトム検出
回路,前記DC検出回路に電圧を印加してそれぞれの回
路特性を求め、 前記ピーク電圧,前記ボトム電圧,前記DC電圧を検出
するときには、前記第1切り替えスイッチと前記第2切
り替えスイッチを切り替えて前記ピーク電圧,前記ボト
ム電圧,前記DC電圧を測定し、前記回路特性に基づい
て補正してγ値を演算することを特徴とする光ディスク
装置。
2. A peak detection circuit which receives an AC component signal of an RF signal and outputs a peak voltage thereof; a bottom detection circuit which receives the AC component signal of the RF signal and outputs a bottom voltage thereof; A DC detection circuit that measures a DC component of an RF signal and outputs a DC voltage; an AD converter that measures the peak voltage, the bottom voltage, and the DC voltage; and a peak detection circuit and a bottom detection circuit. Voltage can be applied to each to measure circuit characteristics D
A converter, a first changeover switch capable of selectively connecting the peak detection circuit and the bottom detection circuit to one of the capacitor and the DA converter, and selects one of the RF signal and the output of the DA converter. A second changeover switch that can be input to the DC conversion circuit is provided, and the control calculation unit sets the first changeover switch and the second changeover switch before detecting the peak voltage, the bottom voltage, and the DC voltage. By switching, a voltage is applied from the DA converter to the peak detection circuit, the bottom detection circuit, and the DC detection circuit to obtain respective circuit characteristics, and when the peak voltage, the bottom voltage, and the DC voltage are detected, , The first changeover switch and the second changeover switch are switched to change the peak voltage and the bottom voltage. An optical disk device, characterized in that the voltage and the DC voltage are measured and corrected based on the circuit characteristic to calculate a γ value.
【請求項3】RF信号のAC成分信号が入力され、その
ピーク電圧を出力するピーク検出回路と、 前記RF信号に前記AC成分信号が入力され、そのボト
ム電圧を出力するボトム検出回路と、 前記ピーク電圧と前記ボトム電圧を測定するためのAD
変換器と、 前記ピーク検出回路と前記ボトム検出回路の回路特性を
測定するためにそれぞれに電圧を加えることができるD
A変換器と、 前記RF信号または前記AC成分信号の一方を選択する
ことができる第3切り替えスイッチと、 前記ピーク検出回路と前記ボトム検出回路を前記第3切
り替えスイッチの出力側または前記DA変換器の一方に
選択的に接続できる第4切り替えスイッチとを備え、 制御演算部が、前記ピーク電圧と前記ボトム電圧を検出
する前に、前記第4切り替えスイッチを切り替えること
よって前記DA変換器から前記ピーク検出回路と前記ボ
トム検出回路に電圧を印加してそれぞれの回路特性を求
め、 β値を測定するときには、前記第3切り替えスイッチと
前記第4切り替えスイッチを切り替えて、前記AC成分
信号を前記ピーク検出回路と前記ボトム検出回路に入力
して前記ピーク電圧と前記ボトム電圧を測定し、前記回
路特性に基づいて補正してβ値を演算し、 γ値を測定するときには、前記RF信号を前記ピーク検
出回路と前記ボトム検出回路に入力して前記ピーク電圧
と前記ボトム電圧を測定し、前記回路特性に基づいて補
正してγ値を演算することを特徴とする光ディスク装
置。
3. A peak detection circuit which receives an AC component signal of an RF signal and outputs a peak voltage thereof; a bottom detection circuit which receives the AC component signal of the RF signal and outputs a bottom voltage thereof; AD for measuring the peak voltage and the bottom voltage
A converter and a voltage that can be applied to each of them to measure the circuit characteristics of the peak detection circuit and the bottom detection circuit.
A converter, a third changeover switch capable of selecting one of the RF signal and the AC component signal, the peak detection circuit and the bottom detection circuit on the output side of the third changeover switch, or the DA converter And a fourth changeover switch that can be selectively connected to one of the two, wherein the control operation unit switches the fourth changeover switch before detecting the peak voltage and the bottom voltage, thereby changing the peak from the DA converter. When a voltage is applied to the detection circuit and the bottom detection circuit to obtain respective circuit characteristics and the β value is measured, the third changeover switch and the fourth changeover switch are changed over to detect the AC component signal by the peak detection. Circuit and the bottom detection circuit to measure the peak voltage and the bottom voltage, based on the circuit characteristics When correcting and calculating the β value and measuring the γ value, the RF signal is input to the peak detection circuit and the bottom detection circuit to measure the peak voltage and the bottom voltage, and based on the circuit characteristics. An optical disk device characterized by correcting and calculating a γ value.
【請求項4】ピーク電圧とボトム電圧を検出する前に、
DA変換器からピーク検出回路とボトム検出回路に電圧
を印加してそれぞれの回路特性を求め、 前記ピーク電圧と前記ボトム電圧を検出するときには、
前記ピーク電圧と前記ボトム電圧を測定し、前記回路特
性に基づいて補正してβ値を演算することを特徴とする
光ディスク装置のパワ制御方法。
4. Before detecting the peak voltage and the bottom voltage,
When a voltage is applied from the DA converter to the peak detection circuit and the bottom detection circuit to obtain respective circuit characteristics, and when the peak voltage and the bottom voltage are detected,
A power control method for an optical disk device, wherein the peak voltage and the bottom voltage are measured and corrected based on the circuit characteristic to calculate a β value.
【請求項5】ピーク電圧,ボトム電圧,DC電圧を検出
する前に、DA変換器からピーク検出回路,ボトム検出
回路,DC検出回路に電圧を印加してそれぞれの回路特
性を求め、 前記ピーク電圧,前記ボトム電圧,前記DC電圧を検出
するときには、前記ピーク電圧,前記ボトム電圧,前記
DC電圧を測定し、前記回路特性に基づいて補正してγ
値を演算することを特徴とする光ディスク装置のパワ制
御方法。
5. Before detecting the peak voltage, the bottom voltage, and the DC voltage, a voltage is applied from the DA converter to the peak detection circuit, the bottom detection circuit, and the DC detection circuit to obtain respective circuit characteristics, and the peak voltage is calculated. , When detecting the bottom voltage and the DC voltage, the peak voltage, the bottom voltage, and the DC voltage are measured, and corrected based on the circuit characteristic to γ.
A power control method for an optical disk device, wherein a value is calculated.
【請求項6】ピーク電圧とボトム電圧を検出する前に、
DA変換器からピーク検出回路とボトム検出回路に電圧
を印加してそれぞれの回路特性を求め、 β値を測定するときには、RF信号のAC成分信号を前
記ピーク検出回路と前記ボトム検出回路に入力して前記
ピーク電圧と前記ボトム電圧を測定し、前記回路特性に
基づいて補正してβ値を演算し、 γ値を測定するときには、前記RF信号を前記ピーク検
出回路と前記ボトム検出回路に入力して前記ピーク電圧
と前記ボトム電圧を測定し、前記回路特性に基づいて補
正してγ値を演算することを特徴とする光ディスク装置
のパワ制御方法。
6. Before detecting the peak voltage and the bottom voltage,
When a voltage is applied from the DA converter to the peak detection circuit and the bottom detection circuit to obtain the respective circuit characteristics and the β value is measured, the AC component signal of the RF signal is input to the peak detection circuit and the bottom detection circuit. Then, the peak voltage and the bottom voltage are measured, and the β value is calculated by correcting based on the circuit characteristic. When measuring the γ value, the RF signal is input to the peak detection circuit and the bottom detection circuit. A power control method for an optical disk device, wherein: the peak voltage and the bottom voltage are measured and corrected, and the γ value is calculated based on the circuit characteristic.
JP2001341670A 2001-11-07 2001-11-07 Optical disk device and optical power control method Pending JP2003151160A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001341670A JP2003151160A (en) 2001-11-07 2001-11-07 Optical disk device and optical power control method

Publications (1)

Publication Number Publication Date
JP2003151160A true JP2003151160A (en) 2003-05-23

Family

ID=19155657

Family Applications (1)

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Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7406015B2 (en) 2002-07-18 2008-07-29 Nec Corporation Information recording medium, method of generating flag, method of producing information recording medium, method of adjusting recording conditions of information recording medium, method of recording for information recording medium and information recording device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7406015B2 (en) 2002-07-18 2008-07-29 Nec Corporation Information recording medium, method of generating flag, method of producing information recording medium, method of adjusting recording conditions of information recording medium, method of recording for information recording medium and information recording device

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