JPH06236550A - Optical disk device - Google Patents
Optical disk deviceInfo
- Publication number
- JPH06236550A JPH06236550A JP5024384A JP2438493A JPH06236550A JP H06236550 A JPH06236550 A JP H06236550A JP 5024384 A JP5024384 A JP 5024384A JP 2438493 A JP2438493 A JP 2438493A JP H06236550 A JPH06236550 A JP H06236550A
- Authority
- JP
- Japan
- Prior art keywords
- power
- recording
- semiconductor laser
- current
- reproduction
- 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.)
- Granted
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は光源として半導体レーザ
を用いた光ディスク装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device using a semiconductor laser as a light source.
【０００２】[0002]
【従来の技術】光ディスク装置においては、光源には小
型、軽量、高効率であるという理由から半導体レーザが
用いられ、この半導体レーザからの光を記録媒体上に集
光して情報の記録や再生を行っている。しかし、半導体
レーザは、駆動電流の変化に敏感であり、逆耐圧が小さ
くて過大な電圧印加に対してすぐに破壊してしまう。そ
こで、光ディスク装置において、電源投入時のサージ電
流等から半導体レーザを保護するために、電源投入後に
半導体レーザに加えられる電圧を徐々に増加させるスロ
ースタート回路を用いるようにしたものが、特開昭６１
ー２７９１８８号公報及び特開昭６２ー４７１８１号公
報により知られている。2. Description of the Related Art In an optical disk device, a semiconductor laser is used as a light source because of its small size, light weight and high efficiency. The light from this semiconductor laser is focused on a recording medium to record or reproduce information. It is carried out. However, the semiconductor laser is sensitive to changes in the driving current, has a small reverse breakdown voltage, and is easily destroyed when an excessive voltage is applied. Therefore, in an optical disk device, in order to protect the semiconductor laser from a surge current when the power is turned on, a slow start circuit that gradually increases the voltage applied to the semiconductor laser after the power is turned on is used. 61
-279189 and JP-A-62-47181.
【０００３】図６は従来の光ディスク装置における半導
体レーザ駆動回路を示し、図７はそのタイミングチャー
トを示す。一般に、光ディスク装置における半導体レー
ザ駆動回路は、スロースタート部１１、再生パワー制御
部１２、記録パワー制御部１３、スイッチング部１４に
大別される。スロースタート部１１はトランジスタ１
５、コンデンサ１６および抵抗１７により構成され、再
生パワー制御部１２はトランジスタ１８および抵抗１９
により構成される。記録パワー制御部１３はトランジス
タ２０および抵抗２１により構成され、スイッチング部
１４はトランジスタ２２，２３、アンプ２４および抵抗
２５により構成される。FIG. 6 shows a semiconductor laser drive circuit in a conventional optical disk device, and FIG. 7 shows its timing chart. Generally, a semiconductor laser drive circuit in an optical disc device is roughly divided into a slow start unit 11, a reproduction power control unit 12, a recording power control unit 13, and a switching unit 14. Slow start part 11 is transistor 1
5, the reproducing power control section 12 is composed of a transistor 18 and a resistor 19.
It is composed of The recording power control unit 13 is composed of a transistor 20 and a resistor 21, and the switching unit 14 is composed of transistors 22 and 23, an amplifier 24 and a resistor 25.
【０００４】光ディスク装置の電源スイッチ２６がオン
されて電源が投入されると、スロースタート部１１によ
り半導体レーザ用電源が抵抗１７およびコンデンサ１６
により決定される時定数で立ち上がる。光ディスク装置
が情報再生動作に入ると、図示しない再生パワー制御回
路による再生系制御信号２７が再生パワー制御部１２に
おけるトランジスタ１８のベースに加えられて再生電流
ＩRが一定となるように再生系制御がかかる。この再生
電流ＩRはスロースタート部１１から抵抗１９およびト
ランジスタ１８を通って半導体レーザ（ＬＤ）２８に流
れ、半導体レーザ２８が再生パワーで点灯する。この状
態では、抵抗１９にかかる電圧ＶRは一定である。When the power switch 26 of the optical disk device is turned on and the power is turned on, the slow start section 11 causes the power source for the semiconductor laser to turn on the resistor 17 and the capacitor 16.
It rises with the time constant determined by. When the optical disk device enters the information reproduction operation, a reproduction system control signal 27 by a reproduction power control circuit (not shown) is applied to the base of the transistor 18 in the reproduction power control unit 12 so that the reproduction current I R becomes constant. Takes. The reproduction current I R flows from the slow start portion 11 to the semiconductor laser (LD) 28 through the resistor 19 and the transistor 18, and the semiconductor laser 28 is turned on by the reproduction power. In this state, the voltage V R applied to the resistor 19 is constant.
【０００５】次に、情報記録／消去動作に入ると、図示
しない記録パワー制御回路による記録系制御信号２９が
トランジスタ２０のベースに加えられてスロースタート
部１１から抵抗２１およびトランジスタ２０を通して記
録電流ＩPが流れる。さらに、記録データがアンプ２４
を介してトランジスタ２２，２３のベースに逆相で加え
られ、記録データが“１”の場合にはトランジスタ２２
がオンしてトランジスタ２３がオフすることにより記録
電流ＩPがトランジスタ２２を通して半導体レーザ２８
に流れて半導体レーザが記録パワーで点灯する。また、
記録データが“０”の場合にはトランジスタ２３がオン
してトランジスタ２２がオフすることにより記録電流Ｉ
Pがトランジスタ２３及び抵抗２５を通してアース側に
流れ、半導体レーザ２８が消灯する。記録電流ＩPは低
消費電力の観点で情報再生動作時にはＩP＝０とされ、
情報記録動作に入る直前に記録系制御信号２９が設定さ
れ、記録電流ＩPがトランジスタ２３及び抵抗２５を通
して流れる。Next, when the information recording / erasing operation is started, a recording system control signal 29 by a recording power control circuit (not shown) is applied to the base of the transistor 20, and the recording current I is passed from the slow start portion 11 through the resistor 21 and the transistor 20. P flows. Further, the recorded data is the amplifier 24.
Is added to the bases of the transistors 22 and 23 in the opposite phase via the, and when the recording data is "1", the transistor 22
Is turned on and the transistor 23 is turned off, so that the recording current I P is transmitted through the transistor 22 to the semiconductor laser 28.
And the semiconductor laser is turned on with the recording power. Also,
When the recording data is “0”, the transistor 23 is turned on and the transistor 22 is turned off, so that the recording current I
P flows to the ground side through the transistor 23 and the resistor 25, and the semiconductor laser 28 is turned off. The recording current I P is I P = 0 during the information reproducing operation from the viewpoint of low power consumption,
The recording system control signal 29 is set immediately before starting the information recording operation, and the recording current I P flows through the transistor 23 and the resistor 25.
【０００６】[0006]
【発明が解決しようとする課題】上記光ディスク装置で
は、半導体駆動回路において、情報記録動作に入る直前
に記録系制御信号２９が設定されて記録電流ＩPがトラ
ンジスタ２３及び抵抗２５を通して流れるので、スロー
スタート部１１がトランジスタ１５から（ＩR＋ＩP）な
る電流を流すことになり、トランジスタ１５のコレクタ
電流が増加してトランジスタ１５のベース・エミッタ間
電圧ＶBEが上昇する。このため、ＶRが小さくなり、そ
の結果、再生電流ＩRが小さくなって再生パワーが低下
する。これは、再生系制御がＶRの変動に追従できない
ためである。つまり、記録パワーの設定で再生パワーが
変動し、これによりトラック外れが生ずるという問題が
ある。In the above optical disk device, in the semiconductor drive circuit, the recording system control signal 29 is set immediately before starting the information recording operation, and the recording current I P flows through the transistor 23 and the resistor 25. The start portion 11 causes a current of (I R + I P ) to flow from the transistor 15, the collector current of the transistor 15 increases, and the base-emitter voltage V BE of the transistor 15 increases. Therefore, V R becomes small, and as a result, the reproduction current I R becomes small and the reproduction power decreases. This is because the reproducing system control can not follow the variation of V R. That is, there is a problem in that the reproduction power fluctuates depending on the setting of the recording power, which causes a track deviation.
【０００７】本発明は、上記欠点を改善し、記録パワー
の設定による再生パワーの変動が生じない光ディスク装
置を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to improve the above-mentioned drawbacks and to provide an optical disk device in which the reproduction power does not change due to the setting of the recording power.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、請求項１記載の発明は、半導体レーザからの光を記
録媒体上に集光して情報の記録／再生を行う光ディスク
装置において、前記半導体レーザに電源電圧を供給する
電源電圧供給手段と、前記電源電圧により前記半導体レ
ーザを再生パワーで点灯させるための駆動電流を出力す
る再生電流駆動手段と、情報再生動作時に前記半導体レ
ーザの発光パワーを再生パワーに制御する再生パワー制
御手段と、前記電源電圧により前記半導体レーザを記録
パワーで点灯させるための駆動電流を出力する記録電流
駆動手段と、情報記録動作に入る直前に前記半導体レー
ザが記録パワーで点灯するように前記半導体レーザの発
光パワーを記録パワーに設定し、情報記録動作時に前記
半導体レーザの発光パワーを記録パワーに制御する記録
パワー制御手段とを備え、この記録パワー制御手段によ
る前記記録電流駆動手段の出力駆動電流変化を前記再生
パワー制御手段の制御帯域の時定数より遅くしたもので
ある。In order to achieve the above object, the invention according to claim 1 is an optical disc device for recording / reproducing information by condensing light from a semiconductor laser on a recording medium. A power supply voltage supply means for supplying a power supply voltage to the semiconductor laser, a reproduction current drive means for outputting a drive current for lighting the semiconductor laser with the reproduction power by the power supply voltage, and a light emission power of the semiconductor laser during an information reproduction operation. To a reproduction power, a recording current drive means for outputting a drive current for turning on the semiconductor laser at the recording power by the power supply voltage, and the semiconductor laser recording just before starting the information recording operation. The emission power of the semiconductor laser is set to the recording power so that the semiconductor laser emits light during the information recording operation. And a recording power control means for controlling the word to the recording power, in which the output drive current change of the recording power control means by said recording current drive means is slower than the time constant of the control band of the reproducing power control means.
【０００９】請求項２記載の発明は、請求項１記載の光
ディスク装置において、前記電源電圧供給手段を前記再
生電流駆動手段と前記記録電流駆動手段とで独立に設け
たものである。According to a second aspect of the present invention, in the optical disk device according to the first aspect, the power supply voltage supply means is provided independently of the reproduction current drive means and the recording current drive means.
【００１０】請求項３記載の発明は、複数の半導体レー
ザからの光を記録媒体上に集光して情報の記録／再生を
行う光ディスク装置において、前記複数の半導体レーザ
に個別に電源電圧を供給する複数の電源電圧供給手段
と、この複数の電源電圧供給手段からの各電源電圧によ
り前記複数の半導体レーザの各駆動電流を個別に発生す
る複数の駆動手段と、前記複数の半導体レーザの各発光
パワーを個別に制御する複数の発光パワー制御手段とを
備えたものである。According to a third aspect of the present invention, in an optical disk device for recording / reproducing information by condensing light from a plurality of semiconductor lasers on a recording medium, a power supply voltage is individually supplied to the plurality of semiconductor lasers. A plurality of power supply voltage supply means, a plurality of drive means for individually generating respective drive currents of the plurality of semiconductor lasers by the power supply voltages from the plurality of power supply voltage supply means, and a light emission of each of the plurality of semiconductor lasers. And a plurality of light emission power control means for individually controlling the power.
【００１１】[0011]
【作用】請求項１記載の発明では、電源電圧供給手段に
より半導体レーザに電源電圧が供給され、再生電流駆動
手段がその電源電圧により半導体レーザを再生パワーで
点灯させるための駆動電流を出力する。再生パワー制御
手段は情報再生動作時に半導体レーザの発光パワーを再
生パワーに制御し、記録電流駆動手段が前記電源電圧に
より半導体レーザを記録パワーで点灯させるための駆動
電流を出力する。記録パワー制御手段は、情報記録動作
に入る直前に半導体レーザが記録パワーで点灯するよう
に半導体レーザの発光パワーを記録パワーに設定し、情
報記録動作時に半導体レーザの発光パワーを記録パワー
に制御する。そして、記録パワー制御手段による記録電
流駆動手段の出力駆動電流変化が再生パワー制御手段の
制御帯域の時定数より遅い。According to the first aspect of the invention, the power supply voltage is supplied to the semiconductor laser by the power supply voltage supply means, and the reproduction current drive means outputs the drive current for lighting the semiconductor laser with the reproduction power by the power supply voltage. The reproduction power control means controls the emission power of the semiconductor laser to the reproduction power during the information reproduction operation, and the recording current drive means outputs the drive current for turning on the semiconductor laser at the recording power by the power supply voltage. The recording power control means sets the emission power of the semiconductor laser to the recording power so that the semiconductor laser is turned on at the recording power immediately before starting the information recording operation, and controls the emission power of the semiconductor laser to the recording power during the information recording operation. . The change in the output drive current of the recording current drive means by the recording power control means is slower than the time constant of the control band of the reproduction power control means.
【００１２】請求項２記載の発明では、請求項１記載の
光ディスク装置において、電源電圧供給手段が再生電流
駆動手段と記録電流駆動手段とに独立に電源電圧を供給
する。 請求項３記載の発明では、複数の電源電圧供給
手段が複数の半導体レーザに個別に電源電圧を供給し、
複数の駆動手段が複数の電源電圧供給手段からの各電源
電圧により複数の半導体レーザの各駆動電流を個別に発
生する。そして、複数の発光パワー制御手段が複数の半
導体レーザの各発光パワーを個別に制御する。According to a second aspect of the present invention, in the optical disk device according to the first aspect, the power supply voltage supply means independently supplies the power supply voltage to the reproduction current drive means and the recording current drive means. According to another aspect of the invention, the plurality of power supply voltage supply means individually supply the power supply voltage to the plurality of semiconductor lasers,
The plurality of drive means individually generate the respective drive currents of the plurality of semiconductor lasers by the respective power supply voltages from the plurality of power supply voltage supply means. Then, the plurality of light emission power control means individually control the respective light emission powers of the plurality of semiconductor lasers.
【００１３】[0013]
【実施例】図１は本発明の第１実施例における半導体レ
ーザ駆動回路を示す。この第１実施例は、請求項１記載
の発明の実施例であり、半導体レーザ３１からの光を光
ディスクからなる記録媒体上に集光して情報の記録や再
生を行う。スロースタート回路３２は光ディスク装置の
電源スイッチ３３がオンされることにより電源が投入さ
れた時に起動してサージ電流等を半導体レーザ３１に流
さないように電源電圧を徐々に増加させる保護回路であ
る。パワー検出用受光素子３４は半導体レーザ３１の発
光パワーを検出するための受光素子であり、半導体レー
ザ３１の出力光の一部を受光する。1 shows a semiconductor laser drive circuit according to a first embodiment of the present invention. The first embodiment is an embodiment of the invention described in claim 1, and the light from the semiconductor laser 31 is focused on a recording medium composed of an optical disk to record or reproduce information. The slow start circuit 32 is a protection circuit that is activated when the power switch 33 of the optical disk device is turned on and is activated to gradually increase the power supply voltage so that surge current or the like does not flow to the semiconductor laser 31. The power detection light receiving element 34 is a light receiving element for detecting the light emission power of the semiconductor laser 31, and receives a part of the output light of the semiconductor laser 31.
【００１４】半導体レーザ３１を再生パワーで点灯させ
る情報再生時には、再生電流駆動回路３５はスロースタ
ート回路３２から供給される電源電圧により駆動電流を
半導体レーザ３１に流して半導体レーザ３１を再生パワ
ーで点灯させ、半導体レーザ３１の出力光の一部がパワ
ー検出用受光素子３４により受光されてパワー検出用受
光素子３４の出力信号が初段アンプ３６により増幅され
る。初段アンプ３６の出力信号電圧は再生パワー制御回
路３７により目標電圧と比較され、その差電圧により再
生電流駆動回路３７が制御されることによって半導体レ
ーザ３１の駆動電流が上記差電圧に応じて制御されて半
導体レーザ３１の発光パワーが所望の再生パワーに制御
される。At the time of information reproduction for turning on the semiconductor laser 31 with the reproduction power, the reproduction current drive circuit 35 causes a drive current to flow to the semiconductor laser 31 by the power supply voltage supplied from the slow start circuit 32 to turn on the semiconductor laser 31 with the reproduction power. Then, a part of the output light of the semiconductor laser 31 is received by the power detection light receiving element 34, and the output signal of the power detection light receiving element 34 is amplified by the first stage amplifier 36. The output signal voltage of the first-stage amplifier 36 is compared with the target voltage by the reproduction power control circuit 37, and the reproduction current drive circuit 37 is controlled by the difference voltage, whereby the drive current of the semiconductor laser 31 is controlled according to the difference voltage. Thus, the emission power of the semiconductor laser 31 is controlled to a desired reproduction power.
【００１５】また、情報記録／再生動作に先立って記録
パワー制御動作が行われ、マイクロコンピュータ（ＣＰ
Ｕ）３８は図２に示すように記録パワー設定用Ｄ／Ａ変
換器３９にデータＤ／Ａ（最初は初期値Ｄ／Ａ０）をセ
ットして記録媒体の図３に示すようなセクタフォーマッ
トにおけるＡＬＰＣ部に半導体レーザからの光が照射さ
れるタイミングでスイッチング回路４０を動作させるこ
とで半導体レーザ３１を記録パワーで点灯させる。Further, the recording power control operation is performed prior to the information recording / reproducing operation, and the microcomputer (CP
U) 38 sets the data D / A (initially the initial value D / A0) in the recording power setting D / A converter 39 as shown in FIG. 2 and in the sector format as shown in FIG. 3 of the recording medium. The semiconductor laser 31 is turned on with the recording power by operating the switching circuit 40 at the timing when the light from the semiconductor laser is emitted to the ALPC unit.
【００１６】この場合、Ｄ／Ａ変換器３９はＣＰＵ３８
からのデータをＤ／Ａ変換して記録電流駆動回路４１に
出力し、記録電流駆動回路４１はスロースタート回路３
２からの電源電圧によりスイッチング回路４０を通して
半導体レーザ３１にＤ／Ａ変換器３９の出力信号に応じ
た記録電流を流す。スイッチング回路４０はＣＰＵ３８
からの制御信号により半導体レーザからの光が記録媒体
上のＡＬＰＣ部に照射されるタイミングでオンして記録
電流駆動回路４２からの記録電流を半導体レーザ３１に
流す。In this case, the D / A converter 39 is the CPU 38
D / A-converts the data from and outputs it to the recording current drive circuit 41.
A recording current corresponding to the output signal of the D / A converter 39 is supplied to the semiconductor laser 31 through the switching circuit 40 by the power supply voltage from 2. The switching circuit 40 is the CPU 38
The control signal from the semiconductor laser 31 is turned on at the timing when the light from the semiconductor laser is irradiated to the ALPC portion on the recording medium, and the recording current from the recording current drive circuit 42 is supplied to the semiconductor laser 31.
【００１７】パワー検出用受光素子３４は半導体レーザ
３１の出力光を受光して半導体レーザ３１の発光パワー
を検出し、受光素子３４の出力信号が初段アンプ３６に
より増幅されてＡ／Ｄ変換器４２によりＡ／Ｄ変換され
た後にＣＰＵ３８へ出力される。ＣＰＵ３８は半導体レ
ーザからの光が記録媒体上のＡＬＰＣ部に照射されるタ
イミングでＡ／Ｄ変換器４２からのデータを取り込んで
これを目標値と比較することにより半導体レーザ３１が
所定の記録パワーで発光しているか否かを判断し、半導
体レーザ３１が所定の記録パワーで発光していない場合
にはＤ／Ａ変換器３９へのデータＤ／Ａを＋１だけ増加
させて記録電流駆動回路４２による記録電流を増加させ
る。The light receiving element 34 for power detection receives the output light of the semiconductor laser 31 to detect the light emission power of the semiconductor laser 31, and the output signal of the light receiving element 34 is amplified by the first stage amplifier 36 to be A / D converter 42. Is output to the CPU 38 after being A / D converted by. The CPU 38 takes in the data from the A / D converter 42 at the timing when the light from the semiconductor laser is applied to the ALPC section on the recording medium, and compares this with a target value, so that the semiconductor laser 31 has a predetermined recording power. Whether the semiconductor laser 31 is emitting light or not is determined. If the semiconductor laser 31 is not emitting light at a predetermined recording power, the data D / A to the D / A converter 39 is increased by +1 and the recording current drive circuit 42 is used. Increase the recording current.
【００１８】次に、ＣＰＵ３８は半導体レーザからの光
が記録媒体上のＡＬＰＣ部に照射されるタイミングでス
イッチング回路４０を動作させることで半導体レーザ３
１を点灯させ、Ａ／Ｄ変換器４２からのデータを取り込
んでこれを目標値と比較することにより半導体レーザ３
１が所定の記録パワーで発光しているか否かを判断す
る。ＣＰＵ３８は半導体レーザ３１が所定の記録パワー
で発光していない（発光パワーが所定の記録パワーに達
していない）場合にはＤ／Ａ変換器３９へのデータＤ／
Ａを＋１だけ増加させ、以下半導体レーザ３１が所定の
記録パワーで発光するようになるまで同様な動作が繰り
返して行われる。ＣＰＵ３８は半導体レーザ３１が所定
の記録パワーで発光するようになれば上述のような記録
パワー制御動作を終了する。Next, the CPU 38 operates the switching circuit 40 at the timing when the light from the semiconductor laser is irradiated to the ALPC section on the recording medium, and the semiconductor laser 3
1 is turned on, the data from the A / D converter 42 is taken in, and this is compared with the target value to obtain the semiconductor laser 3
It is determined whether or not 1 emits light with a predetermined recording power. When the semiconductor laser 31 does not emit light with a predetermined recording power (emission power does not reach the predetermined recording power), the CPU 38 outputs data D / A to the D / A converter 39.
A is incremented by +1 and thereafter the same operation is repeated until the semiconductor laser 31 emits light with a predetermined recording power. When the semiconductor laser 31 emits light with a predetermined recording power, the CPU 38 ends the recording power control operation as described above.
【００１９】ここで、ＣＰＵ３８が記録パワー制御動作
時にＤ／Ａ変換器３９へデータＤ／Ａを設定するタイミ
ング（データＤ／Ａを＋１づつ増加させるタイミング）
は、上記再生パワー制御系の制御帯域の時定数より遅く
してある。このため、記録電流が再生パワー制御系の制
御帯域の時定数より遅く徐々に変化し、記録パワーの設
定による再生パワーの変動を極力抑制することができて
トラック外れが生じなくなり、安定に情報記録／再生動
作を行うことができる。Here, the timing at which the CPU 38 sets the data D / A to the D / A converter 39 during the recording power control operation (timing to increment the data D / A by +1).
Is slower than the time constant of the control band of the reproduction power control system. For this reason, the recording current gradually changes slower than the time constant of the control band of the reproduction power control system, and the fluctuation of the reproduction power due to the setting of the recording power can be suppressed as much as possible to prevent the track from becoming out of track and to stably record the information. / Playback operation can be performed.
【００２０】記録／消去動作は従来と同様に行われ、受
光素子３４，初段アンプ３６，ＣＰＵ３８，Ｄ／Ａ変換
器３９により半導体レーザ３１の発光パワーが記録パワ
ーの目標値に制御され、スイッチング回路４０が記録デ
ータに応じてオン／オフして半導体レーザ３１が記録パ
ワーで点灯したり消灯したりして記録媒体に記録データ
が記録される。第１実施例では、Ｄ／Ａ変換器３９への
データＤ／Ａを＋１づつ増加させたが、データＤ／Ａの
１回の増加量は＋１に限るものではない。また、半導体
レーザ３１の発光パワーを目標値に制御する手段は上記
第１実施例の制御方式に限定されず、別の制御方式を採
用してもよい。The recording / erasing operation is performed in the same manner as the conventional one, and the light emitting element 34, the first stage amplifier 36, the CPU 38, and the D / A converter 39 control the emission power of the semiconductor laser 31 to the target value of the recording power, and the switching circuit. The recording data is recorded on the recording medium by turning on / off 40 according to the recording data and turning on / off the semiconductor laser 31 with the recording power. Although the data D / A to the D / A converter 39 is incremented by +1 in the first embodiment, the increment of the data D / A once is not limited to +1. The means for controlling the emission power of the semiconductor laser 31 to the target value is not limited to the control method of the first embodiment, and another control method may be adopted.
【００２１】図４は本発明の第２実施例を示し、図１と
同一部分には同一符号が付してある。 この第２実施例
は、請求項２記載の発明の実施例であり、上記第１実施
例において、記録系と再生系とで独立にスロースタート
回路４３，４４が設けられている。スロースタート回路
４３，４４は光ディスク装置の電源スイッチ３３がオン
されることにより電源が投入された時にそれぞれ独立に
起動してサージ電流等を半導体レーザ３１に流さないよ
うに電源電圧を徐々に増加させる。記録系のスロースタ
ート回路４３の出力電圧は記録電流駆動回路４１及びス
イッチング回路４０を介して半導体レーザ３１に加えら
れ、再生系のスロースタート回路４４の出力電圧は再生
電流駆動回路３５を介して半導体レーザ３１に加えられ
る。FIG. 4 shows a second embodiment of the present invention, and the same parts as those in FIG. 1 are designated by the same reference numerals. This second embodiment is an embodiment of the invention described in claim 2, and in the first embodiment, the slow start circuits 43 and 44 are provided independently for the recording system and the reproducing system. The slow start circuits 43 and 44 are independently activated when the power is turned on by turning on the power switch 33 of the optical disk device, and gradually increase the power supply voltage so that surge current or the like does not flow to the semiconductor laser 31. . The output voltage of the slow start circuit 43 of the recording system is applied to the semiconductor laser 31 via the recording current drive circuit 41 and the switching circuit 40, and the output voltage of the slow start circuit 44 of the reproduction system is transmitted via the reproduction current drive circuit 35 to the semiconductor. It is added to the laser 31.
【００２２】この第２実施例では、情報記録／再生動作
に先立って記録パワー制御動作が行われる場合、記録系
と再生系とで独立にスロースタート回路４３，４４が設
けられているので、記録系に電流が流れても再生系に影
響が出なくて再生パワーの変動が生じなくなり、高速に
記録パワーの設定を行うことができると共にトラック外
れが生じなくなって安定に情報記録／再生動作を行うこ
とができる。In the second embodiment, when the recording power control operation is performed prior to the information recording / reproducing operation, the slow start circuits 43 and 44 are provided independently for the recording system and the reproducing system, and therefore the recording is performed. Even if a current flows through the system, the reproducing system is not affected, the reproducing power does not fluctuate, the recording power can be set at high speed, and track deviation does not occur, so that stable information recording / reproducing operation is performed. be able to.
【００２３】図５は本発明の第３実施例を示す。この第
３実施例は、請求項３記載の発明の実施例であり、複数
の半導体レーザ５６，５７からの光を光ディスクからな
る記録媒体上に集光して情報の記録や再生を行う。スロ
ースタート回路４５，４６は光ディスク装置の電源スイ
ッチ３３がオンされることにより電源が投入された時に
それぞれ独立に起動してサージ電流等を半導体レーザ５
６，５７に流さないように電源電圧を徐々に増加させ
る。半導体レーザ駆動部４７，４８は、それぞれスロー
スタート回路４５，４６から電源電圧が与えられ、スイ
ッチング回路４９，５０を介して半導体レーザ５６，５
７に駆動電流を供給する。スイッチング回路４９，５０
は、それぞれ入力信号に応じてオン／オフし、オン時に
半導体レーザ駆動部４７，４８からの駆動電流を半導体
レーザ５６，５７に供給して半導体レーザ５６，５７を
点灯させる。FIG. 5 shows a third embodiment of the present invention. The third embodiment is an embodiment of the invention described in claim 3, in which light from a plurality of semiconductor lasers 56 and 57 is condensed on a recording medium composed of an optical disk to record and reproduce information. The slow start circuits 45 and 46 are activated independently when the power is turned on by turning on the power switch 33 of the optical disk device, and the surge current or the like is generated by the semiconductor laser 5.
The power supply voltage is gradually increased so as not to flow to 6, 57. The semiconductor laser driving units 47 and 48 are supplied with power supply voltages from the slow start circuits 45 and 46, respectively, and the semiconductor laser driving units 47 and 48 pass through the switching circuits 49 and 50, respectively.
A drive current is supplied to 7. Switching circuit 49, 50
Respectively turn on / off according to an input signal, and when turned on, drive currents from the semiconductor laser drive units 47, 48 are supplied to the semiconductor lasers 56, 57 to turn on the semiconductor lasers 56, 57.
【００２４】受光素子５１，５２はそれぞれ半導体レー
ザ５６，５７の出力光を受光して半導体レーザ５６，５
７の発光パワーを検出し、半導体レーザ制御回路５３，
５４は受光素子５１，５２の出力信号をＣＰＵ５５から
与えられた設定値と比較し、その差に応じて半導体レー
ザ５６，５７を制御することにより半導体レーザ５６，
５７の駆動電流を上記差に応じて制御して半導体レーザ
５６，５７の発光パワーを所望の値に制御する。The light receiving elements 51 and 52 receive the output lights of the semiconductor lasers 56 and 57, respectively, and receive the semiconductor lasers 56 and 5 respectively.
7, the semiconductor laser control circuit 53,
Reference numeral 54 compares the output signals of the light receiving elements 51 and 52 with a set value given from the CPU 55, and controls the semiconductor lasers 56 and 57 in accordance with the difference between the set values.
The drive current of 57 is controlled according to the above difference to control the emission power of the semiconductor lasers 56, 57 to a desired value.
【００２５】この第３実施例では、半導体レーザ５６，
５７は、独立したスロースタート回路４５，４６により
電源電圧が与えられるので、それぞれ高速に発光パワー
の設定を行うことができ、発光パワーの設定によるお互
いの干渉がなくて発光パワーの変動が生じず、安定した
記録／再生動作を行うことができる。In the third embodiment, the semiconductor laser 56,
Since the power supply voltage is applied to the 57 by independent slow start circuits 45 and 46, the light emission powers can be set at high speed, and the light emission powers do not interfere with each other and the light emission power does not fluctuate. Thus, stable recording / reproducing operation can be performed.
【００２６】[0026]
【発明の効果】以上のように請求項１記載の発明によれ
ば、半導体レーザからの光を記録媒体上に集光して情報
の記録／再生を行う光ディスク装置において、前記半導
体レーザに電源電圧を供給する電源電圧供給手段と、前
記電源電圧により前記半導体レーザを再生パワーで点灯
させるための駆動電流を出力する再生電流駆動手段と、
情報再生動作時に前記半導体レーザの発光パワーを再生
パワーに制御する再生パワー制御手段と、前記電源電圧
により前記半導体レーザを記録パワーで点灯させるため
の駆動電流を出力する記録電流駆動手段と、情報記録動
作に入る直前に前記半導体レーザが記録パワーで点灯す
るように前記半導体レーザの発光パワーを記録パワーに
設定し、情報記録動作時に前記半導体レーザの発光パワ
ーを記録パワーに制御する記録パワー制御手段とを備
え、この記録パワー制御手段による前記記録電流駆動手
段の出力駆動電流変化を前記再生パワー制御手段の制御
帯域の時定数より遅くしたので、記録パワーの設定によ
る再生パワーの変動を抑制することができてトラック外
れが生じなくなり、安定に情報記録／再生動作を行うこ
とができる。As described above, according to the first aspect of the invention, in the optical disk device for recording / reproducing information by condensing the light from the semiconductor laser on the recording medium, the semiconductor laser is supplied with a power supply voltage. A power supply voltage supply means for supplying a power supply voltage, and a reproduction current drive means for outputting a drive current for lighting the semiconductor laser with a reproduction power by the power supply voltage,
Reproduction power control means for controlling the emission power of the semiconductor laser to reproduction power during information reproduction operation, recording current drive means for outputting a drive current for turning on the semiconductor laser at the recording power by the power supply voltage, and information recording Recording power control means for setting the emission power of the semiconductor laser to the recording power so that the semiconductor laser is turned on at the recording power immediately before the operation, and controlling the emission power of the semiconductor laser to the recording power during the information recording operation. Since the change of the output drive current of the recording current drive means by the recording power control means is made slower than the time constant of the control band of the reproduction power control means, it is possible to suppress the variation of the reproduction power due to the setting of the recording power. As a result, track deviation does not occur, and stable information recording / reproducing operation can be performed.
【００２７】請求項２記載の発明によれば、請求項１記
載の光ディスク装置において、前記電源電圧供給手段を
前記再生電流駆動手段と前記記録電流駆動手段とで独立
に設けたので、記録系に電流が流れても再生系に影響が
出なくて再生パワーの変動が生じなくなり、高速に記録
パワーの設定を行うことができると共にトラック外れが
生じなくなって安定に情報記録／再生動作を行うことが
できる。According to a second aspect of the invention, in the optical disk device according to the first aspect, the power supply voltage supply means is provided independently of the reproduction current drive means and the recording current drive means, so that the recording system is used. Even if a current flows, the reproduction system is not affected, the reproduction power does not fluctuate, the recording power can be set at a high speed, and track deviation does not occur, so that stable information recording / reproduction operations can be performed. it can.
【００２８】請求項３記載の発明によれば、複数の半導
体レーザからの光を記録媒体上に集光して情報の記録／
再生を行う光ディスク装置において、前記複数の半導体
レーザに個別に電源電圧を供給する複数の電源電圧供給
手段と、この複数の電源電圧供給手段からの各電源電圧
により前記複数の半導体レーザの各駆動電流を個別に発
生する複数の駆動手段と、前記複数の半導体レーザの各
発光パワーを個別に制御する複数の発光パワー制御手段
とを備えたので、それぞれ高速に発光パワーの設定を行
うことができ、発光パワーの設定によるお互いの干渉が
なくて発光パワーの変動が生じず、安定した記録／再生
動作を行うことができる。According to the third aspect of the present invention, light from a plurality of semiconductor lasers is condensed on a recording medium to record / record information.
In an optical disk device for reproducing, a plurality of power supply voltage supply means for individually supplying a power supply voltage to the plurality of semiconductor lasers, and respective drive currents of the plurality of semiconductor lasers by the respective power supply voltages from the plurality of power supply voltage supply means. Since a plurality of driving means for individually generating, and a plurality of light emission power control means for individually controlling each light emission power of the plurality of semiconductor lasers are provided, it is possible to set the light emission power at high speed, There is no mutual interference due to the setting of the light emission power, the light emission power does not fluctuate, and stable recording / reproducing operation can be performed.
【図１】本発明の第１実施例における半導体レーザ駆動
回路を示すブロック図である。FIG. 1 is a block diagram showing a semiconductor laser drive circuit according to a first embodiment of the present invention.
【図２】同第１実施例におけるＣＰＵの処理フローを示
すフローチャートである。FIG. 2 is a flowchart showing a processing flow of a CPU in the first embodiment.
【図３】同第１実施例における記録媒体のセクタフォー
マットを示す図である。FIG. 3 is a diagram showing a sector format of a recording medium in the first embodiment.
【図４】本発明の第２実施例における半導体レーザ駆動
回路を示すブロック図である。FIG. 4 is a block diagram showing a semiconductor laser drive circuit according to a second embodiment of the present invention.
【図５】本発明の第３実施例における半導体レーザ駆動
回路を示すブロック図である。FIG. 5 is a block diagram showing a semiconductor laser drive circuit according to a third embodiment of the present invention.
【図６】従来の光ディスク装置における半導体レーザ駆
動回路を示すブロック図である。FIG. 6 is a block diagram showing a semiconductor laser drive circuit in a conventional optical disc device.
【図７】同半導体レーザ駆動回路の動作を示すタイミン
グチャートである。FIG. 7 is a timing chart showing an operation of the semiconductor laser drive circuit.
３１，５６，５７ 半導体レーザ ３２，４３，４４，４５，４６ スロースタート回
路 ３４，５１，５２ 受光素子 ３５ 再生電流駆動回路 ３７ 再生パワー制御回路 ３８，５５ ＣＰＵ ３９ Ｄ／Ａ変換器 ４０，４９，５０ スイッチング回路 ４１ 記録電流駆動回路 ４２ Ａ／Ｄ変換器 ４７，４８ 半導体レーザ駆動部 ５３，５４ 半導体レーザ制御回路31, 56, 57 semiconductor laser 32, 43, 44, 45, 46 slow start circuit 34, 51, 52 light receiving element 35 reproducing current drive circuit 37 reproducing power control circuit 38, 55 CPU 39 D / A converter 40, 49, 50 switching circuit 41 recording current drive circuit 42 A / D converter 47, 48 semiconductor laser drive section 53, 54 semiconductor laser control circuit
Claims (3)
して情報の記録／再生を行う光ディスク装置において、
前記半導体レーザに電源電圧を供給する電源電圧供給手
段と、前記電源電圧により前記半導体レーザを再生パワ
ーで点灯させるための駆動電流を出力する再生電流駆動
手段と、情報再生動作時に前記半導体レーザの発光パワ
ーを再生パワーに制御する再生パワー制御手段と、前記
電源電圧により前記半導体レーザを記録パワーで点灯さ
せるための駆動電流を出力する記録電流駆動手段と、情
報記録動作に入る直前に前記半導体レーザが記録パワー
で点灯するように前記半導体レーザの発光パワーを記録
パワーに設定し、情報記録動作時に前記半導体レーザの
発光パワーを記録パワーに制御する記録パワー制御手段
とを備え、この記録パワー制御手段による前記記録電流
駆動手段の出力駆動電流変化を前記再生パワー制御手段
の制御帯域の時定数より遅くしたことを特徴とする光デ
ィスク装置。1. An optical disc device for recording / reproducing information by condensing light from a semiconductor laser onto a recording medium,
Power supply voltage supply means for supplying a power supply voltage to the semiconductor laser, reproduction current drive means for outputting a drive current for lighting the semiconductor laser with reproduction power by the power supply voltage, and light emission of the semiconductor laser during information reproduction operation Reproduction power control means for controlling the power to reproduction power, recording current drive means for outputting a drive current for lighting the semiconductor laser at the recording power by the power supply voltage, and the semiconductor laser just before starting the information recording operation. A recording power control means for setting the emission power of the semiconductor laser to the recording power so that the semiconductor laser is turned on with the recording power, and controlling the emission power of the semiconductor laser to the recording power during an information recording operation. The output drive current change of the recording current drive means is timed in the control band of the reproduction power control means. Optical disc apparatus characterized by being slower.
前記電源電圧供給手段を前記再生電流駆動手段と前記記
録電流駆動手段とで独立に設けたことを特徴とする光デ
ィスク装置。2. The optical disk device according to claim 1, wherein
An optical disk device, wherein the power supply voltage supply means is provided independently of the reproduction current drive means and the recording current drive means.
に集光して情報の記録／再生を行う光ディスク装置にお
いて、前記複数の半導体レーザに個別に電源電圧を供給
する複数の電源電圧供給手段と、この複数の電源電圧供
給手段からの各電源電圧により前記複数の半導体レーザ
の各駆動電流を個別に発生する複数の駆動手段と、前記
複数の半導体レーザの各発光パワーを個別に制御する複
数の発光パワー制御手段とを備えたことを特徴とする光
ディスク装置。3. An optical disk device for recording / reproducing information by condensing light from a plurality of semiconductor lasers onto a recording medium, and supplying a plurality of power supply voltages to the plurality of semiconductor lasers individually. Means, a plurality of driving means for individually generating respective drive currents of the plurality of semiconductor lasers by respective power supply voltages from the plurality of power supply voltage supply means, and individually controlling light emission powers of the plurality of semiconductor lasers. An optical disk device comprising a plurality of light emission power control means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02438493A JP3210754B2 (en) | 1993-02-12 | 1993-02-12 | Optical disk drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02438493A JP3210754B2 (en) | 1993-02-12 | 1993-02-12 | Optical disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06236550A true JPH06236550A (en) | 1994-08-23 |
| JP3210754B2 JP3210754B2 (en) | 2001-09-17 |
Family
ID=12136692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02438493A Expired - Fee Related JP3210754B2 (en) | 1993-02-12 | 1993-02-12 | Optical disk drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3210754B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1873877A1 (en) * | 2006-06-27 | 2008-01-02 | Samsung Electronics Co., Ltd. | Laser scanning device and image forming device including the laser scanning device |
-
1993
- 1993-02-12 JP JP02438493A patent/JP3210754B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1873877A1 (en) * | 2006-06-27 | 2008-01-02 | Samsung Electronics Co., Ltd. | Laser scanning device and image forming device including the laser scanning device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3210754B2 (en) | 2001-09-17 |
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