JPS5990242A - Light quantity controller of optical recording and reproducing device - Google Patents
Light quantity controller of optical recording and reproducing deviceInfo
- Publication number
- JPS5990242A JPS5990242A JP57200575A JP20057582A JPS5990242A JP S5990242 A JPS5990242 A JP S5990242A JP 57200575 A JP57200575 A JP 57200575A JP 20057582 A JP20057582 A JP 20057582A JP S5990242 A JPS5990242 A JP S5990242A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- light
- current
- recording
- intensity
- 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
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/06835—Stabilising during pulse modulation or generation
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optical Head (AREA)
- Lasers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はレーザ光源の変調量を一定レベルに抑え名ため
の光量制御装置に関し、特に光学的に情報を記録再生す
る装置における情報記録のための光パルスの強度を制御
する装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light amount control device for controlling the amount of modulation of a laser light source to a constant level, and in particular to controlling the intensity of a light pulse for recording information in a device that optically records and reproduces information. related to a device for
光ビデオディスク、光ディスクファイル装置４等パルス
状信号で変調されたレーザ光束をレンズで絞り感光性記
録担体に照射して担体を光学的に変質させて情報を記録
し、かつ光学的に情報の記録された担体に読み取りのた
めの光束を照射して担体により反射されあるいは担体を
透過した光束の変化により情報を再生する光学的情報記
録再生装置においては情報の安定した記録のために情報
を記録する光パルスの強度を一定に保つことが必要であ
る。一方、レーザ光の変調強度は変調器を同一条件で駆
動しても温度変動等により容易に変化する。例えば、半
導体レーザにおいては温度上昇によってレーサ発光の閾
値が変化し一定の電流を供給していても発光光量が変化
する。従って高密度高品質の記録を行なうためには記録
用元パルスの強度を規定値に保つように変調駆動信号レ
ベルを制御する必要がある。従来この種の光強度の制御
は主にバイアスレベルの安定化、すなわちパルスを発生
しない弱いレーザ光を定常的に発生している状態での光
量の制御という形で行なわれていた。しかし、これだと
弱い強度の読み出し光束を記録担体に照射して情報を再
生する際には有効であるが、記録時の光パルスの強度は
あく才で間接的にしか制御されなかった。また同様の方
法として記録時の光量の平均値を一定に保つという制御
も考えられているがこれも記録時間中の記録光パルスの
発生時間比が常に一定でなけれはならずパルス発光時間
がランダムに変化するディジクルテーク記録用の光デイ
スクファイル装置等においては光量の正確な制御が困難
であった。Optical video disc, optical disc file device 4, etc. A laser beam modulated by a pulsed signal is irradiated with a lens onto a photosensitive recording carrier to optically change the carrier and record information, and optically record information. In an optical information recording and reproducing device, information is recorded for stable recording of information in an optical information recording/reproducing device that reproduces information by irradiating a light beam for reading onto a carrier and changing the light beam that is reflected by or transmitted through the carrier. It is necessary to keep the intensity of the light pulse constant. On the other hand, the modulation intensity of the laser beam easily changes due to temperature fluctuations, etc. even if the modulator is driven under the same conditions. For example, in a semiconductor laser, the threshold value for laser emission changes due to temperature rise, and the amount of emitted light changes even if a constant current is supplied. Therefore, in order to perform high-density, high-quality recording, it is necessary to control the modulation drive signal level so as to keep the intensity of the recording source pulse at a specified value. Conventionally, this type of light intensity control has mainly been carried out in the form of stabilizing the bias level, that is, controlling the light amount while constantly generating weak laser light without generating pulses. However, although this method is effective when reproducing information by irradiating a readout beam of low intensity onto a record carrier, the intensity of the optical pulse during recording has been controlled only indirectly. A similar method of control has been considered in which the average value of the light intensity during recording is kept constant, but this also requires that the generation time ratio of recording light pulses during the recording time is always constant, and the pulse emission time is random. It has been difficult to accurately control the amount of light in optical disk file devices and the like for digital take recording, where the amount of light varies.
本発明の目的は、かかる難点を除きランタムなパルス幅
で発生する光パルスの強度を安定に制御し、光学的記録
再生装置において高品質な情報の記録を可能にする光景
制御装置を提供しようとするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a sight control device that eliminates such drawbacks and stably controls the intensity of light pulses generated with random pulse widths, thereby making it possible to record high-quality information in an optical recording/reproducing device. It is something to do.
以下に本発明につき図面を参照して詳しく説明する。The present invention will be explained in detail below with reference to the drawings.
第１図は本発明の光量制御装置の一実施例を示すブロッ
ク図である。半導体レーザ１０より出射されるレーザ光
はコリメートレンズ１１により平行光に直され更に集束
レンズ１２によって微小なビームスポットに絞られ記録
担体１３上に照射される。半導体レーザ１０の発光する
レーザ光の一部は光検出器１４に入射し、光検出器１４
は光の強度（光量）に対応する光検出電流１０３を出力
する。FIG. 1 is a block diagram showing an embodiment of the light amount control device of the present invention. Laser light emitted from the semiconductor laser 10 is converted into parallel light by a collimating lens 11, and further condensed into a minute beam spot by a focusing lens 12, and irradiated onto a recording carrier 13. A part of the laser light emitted by the semiconductor laser 10 enters the photodetector 14 and
outputs a photodetection current 103 corresponding to the intensity (amount of light) of light.
半導体レーザ１０にはバイアス電流供給回路２０より半
導体レーザ１０を弱い一定レベルの強度で発光させるた
めのバイアス電流が常時供給される。記録担体１３に情
報を記録する場合には記録ゲート信号１０２がオンにな
るとともに記録データパルス１０１が入力する。記録デ
ータパルス１０１が入力すると変調駆動回路２１は半導
体レーザ１０に記録用光パルスを発生させるためのパル
ス電流を供給する。A bias current is constantly supplied to the semiconductor laser 10 from a bias current supply circuit 20 to cause the semiconductor laser 10 to emit light at a weak constant level of intensity. When recording information on the record carrier 13, the recording gate signal 102 is turned on and the recording data pulse 101 is input. When the recording data pulse 101 is input, the modulation drive circuit 21 supplies a pulse current to the semiconductor laser 10 to generate a recording optical pulse.
半導体レーザ川の特性が変化しなければ記録用パルス電
流の大きさを一定に保つことにより常に同じ強さの記録
１目光パルスが発生するはずであるが、実際には半導体
レーザ１０が個々に特性のばらつきがある上に温度変動
、経時変化等により同じ大きさの電流を供給しても発生
する光パルスの強度は変化する。このため光検出器１４
で検出する光パルスの強さが常に規定値に保たれるよう
にパルス電流の大きさを制御する必要がある。光検出器
１４よりの光検出電流１０３は誤差増幅器２２において
バイアス光量設定器２６よりのバイアス規定電流、およ
びパルス光量規定のためのパルス電流源ｎよりの光量規
定電流パルス１０４との差をとられ増幅される。バイア
ス光量設定器２６は前述したように非記録時に半導体レ
ーザ１０を弱い一定レベルで発光させる際の光量を規定
する一定の電流値を出力する。If the characteristics of the semiconductor laser 10 do not change, the first recording light pulse of the same intensity should always be generated by keeping the magnitude of the recording pulse current constant, but in reality, the semiconductor laser 10 has individual characteristics. In addition to variations in temperature, the intensity of the generated optical pulse changes even when the same amount of current is supplied due to temperature fluctuations, changes over time, etc. For this reason, the photodetector 14
It is necessary to control the magnitude of the pulse current so that the intensity of the optical pulse detected by the sensor is always kept at a specified value. The photodetection current 103 from the photodetector 14 is used in an error amplifier 22 to calculate the difference between the bias regulation current from the bias light quantity setter 26 and the light quantity regulation current pulse 104 from the pulse current source n for regulating the pulsed light quantity. amplified. As described above, the bias light amount setter 26 outputs a constant current value that defines the light amount when the semiconductor laser 10 emits light at a weak constant level during non-recording.
パルス電流源２３は記録データパルス１０１が入力する
と、そのパルスがオンである間記録用光パルスの強度を
規定する一定値の電流レベルを有する光量規定電流パル
ス１０４を出力する。パルス電流源ｎは変調駆動回路２
１と同様の構成で実現することが出来、その出力する電
流パルス１０４の電流レベルは、例えば可変抵抗器３１
の接点位置を調整することにより任意の値に設定できる
。誤差増幅器２２よりの出力１０５は記録光量誤差積分
器２４およびｔ ｓｌｌイア光量誤差積分器２５に入力
する。記録光量誤差積分器２４は記録ゲート信号１０２
がオンであるとサンプルゲート３２がオンとなり誤差増
幅器２２よりの出力の積分を行なう。記録光量誤差積分
器２４の出力１０６は変調駆動回路２１の中の電流供給
回路３４に接続され変調駆動回路２１より半導体レーザ
】０に供給されるパルス′畦流の電流値を変化させる。When the recording data pulse 101 is input, the pulse current source 23 outputs a light quantity regulating current pulse 104 having a constant current level which defines the intensity of the recording optical pulse while the pulse is on. Pulse current source n is modulation drive circuit 2
1 can be realized with a configuration similar to 1, and the current level of the output current pulse 104 is determined by, for example, the variable resistor 31.
It can be set to any value by adjusting the contact position. The output 105 from the error amplifier 22 is input to a recording light amount error integrator 24 and a tsll ear light amount error integrator 25. The recording light amount error integrator 24 receives the recording gate signal 102.
is on, the sample gate 32 is turned on and the output from the error amplifier 22 is integrated. The output 106 of the recording light amount error integrator 24 is connected to the current supply circuit 34 in the modulation drive circuit 21, and changes the current value of the pulse current supplied from the modulation drive circuit 21 to the semiconductor laser 0.
光検出器１４よりの光検出電流１０３の値とバイアス光
量設定器２４よりのバイアス規定電流およびパルス電流
源２３よりの光量規定電流パルス１０４の値とが一致し
ないうちは誤差増幅器２２の出力は０とはならず記録光
量誤差積分器２４はその出力を積分して光検出器１４の
光検出電流１０３とバイアス規定電流および光量規定電
流パルス１０４の値を一致させるようにその出力を変化
させ変調駆動回路２１より出力されるパルス電流の電流
値を制御する。The output of the error amplifier 22 is 0 until the value of the photodetection current 103 from the photodetector 14 and the bias regulation current from the bias light quantity setter 24 and the value of the light quantity regulation current pulse 104 from the pulse current source 23 do not match. Instead, the recording light quantity error integrator 24 integrates its output and changes its output so that the values of the photodetection current 103 of the photodetector 14, the bias regulation current, and the light quantity regulation current pulse 104 match, and performs modulation drive. The current value of the pulse current output from the circuit 21 is controlled.
情報の記録が終了すると記録データパルス１０１が入力
しなくなるとともに記録ゲート信号１０２がオフとなる
。記録ゲート信号１０２がオフとなると記録光景誤差積
分器２４内のサンプルケート３２がオフとなり記録光量
誤差積分器２４はその積分動作を停止させる吉ともに、
コンデンサ３３の働きによりサンプルゲート３２がオフ
となる直前の出力を保持する。この記録光量誤差積分器
２４積分出力１０６は記録ゲート信号１０２がオフであ
る期間中保持され続け、次にＶ↓び記録が開始され記録
ゲート信号１０２がオンとなって再び記録光量誤差積分
器２４が積分動作を開始する際の初期出力値となる。一
方バイアス光量誤差Ｕｆ分器２５は記録ケート信号１０
２がオンである間は、その内部のサンプル’ｆ’−ト３
５がオフであり積分動作を行なわず記録ゲート信号１０
２がオンとなる以前の出力を保持し続けているが、記録
が終了し記録ゲート信号１０２がオフとなるとサンプル
ケート３５がオンとなり、バイアス党閥誤差積分器２５
による誤差増幅器２２の出力１０５の積分動作が開始さ
れる。非記録時には記録ゲート信号１０２はオフであり
記録データパルス１０１が入力しないからパルス電流源
ｎは非動作となり光４ｊ＋規定電流パルス１０４を発生
しないから誤差増幅器２２はバイアス光量設定器２６よ
りのバイアス規定電流と光検出器】４よりの光検出電流
１０３との差のみをとる。従って、バイアス光景誤差積
分器２５はバイアス規定電流と光検出電流１０３との差
を積分することになる。バイアス光量誤差積分器２５の
出力はバイアス電流供給回路２０に接続され半導体レー
ザ１０に供給されるバイアス電流の値を変化させる。When recording of information is completed, the recording data pulse 101 is no longer input and the recording gate signal 102 is turned off. When the recording gate signal 102 is turned off, the sample gate 32 in the recording scene error integrator 24 is turned off, and the recording light amount error integrator 24 stops its integration operation.
The function of the capacitor 33 holds the output immediately before the sample gate 32 is turned off. This recording light amount error integrator 24 integral output 106 continues to be held while the recording gate signal 102 is off, and then V↓ and recording is started and the recording gate signal 102 is turned on and the recording light amount error integrator 24 is the initial output value when starting the integral operation. On the other hand, the bias light quantity error Uf divider 25 outputs the recording signal 10.
2 is on, its internal sample 'f'-to3
5 is off, no integration operation is performed and the recording gate signal 10
However, when recording ends and the recording gate signal 102 turns off, the sample gate 35 turns on, and the bias error integrator 25
The integration operation of the output 105 of the error amplifier 22 is started. During non-recording, the recording gate signal 102 is off and the recording data pulse 101 is not input, so the pulse current source n is inactive and does not generate the light 4j + specified current pulse 104. [Current and Photodetector] Only the difference between the photodetection current 103 from 4 is taken. Therefore, the bias sight error integrator 25 will integrate the difference between the bias regulation current and the photodetection current 103. The output of the bias light amount error integrator 25 is connected to a bias current supply circuit 20 and changes the value of the bias current supplied to the semiconductor laser 10.
記録ゲート信号１０２がオフである間はバイアス光量誤
差積分器２５はバイアス規定電流さ光検出電流１０３と
の差を積分し続けるから結局バイアス電流供給回路２０
より半導体レーザ１０に供給されるバイアス電流の値は
、バイアス光量設定器２６により規定された光量で半導
体レーザ１０が発光するように制御される。情報の記録
が開始され記録デーＨｇ号１０２がオンとなると、バイ
アス光量誤差積分器２５内のサンプルゲート３５がオフ
となり、ハ゛イアス光量誤差積分器２５はその積分動作
を停止させるとともにコンデンサ３６の働きによりサン
プルケート３５がオフとなる直前の出力レベルを保持す
る。このバイアス光量誤差積分器２５の出力は記録ゲー
ト信号１０２がオンである期間中保持され続は記録動作
中も一定レベルのバイアス電流を半導体レーザ１０に供
給するように働く。While the recording gate signal 102 is off, the bias light amount error integrator 25 continues to integrate the difference between the bias regulation current and the photodetection current 103, so that the bias current supply circuit 20
The value of the bias current supplied to the semiconductor laser 10 is controlled so that the semiconductor laser 10 emits light at a light amount prescribed by the bias light amount setter 26. When recording of information is started and the recording data Hg number 102 is turned on, the sample gate 35 in the bias light amount error integrator 25 is turned off, and the bias light amount error integrator 25 stops its integration operation and is The output level immediately before the sample gate 35 is turned off is held. The output of the bias light amount error integrator 25 is held while the recording gate signal 102 is on, and continues to function to supply a constant level of bias current to the semiconductor laser 10 even during the recording operation.
このバイアス’？ｉｌ：流による半導体レーザ１０の発
光光量は記録動作中においてもバイアス光量設定器２６
により規定される光量と概ね等しくなるから記録ゲート
信号１０２がオンである記録動作中は誤差増幅器２２の
出力は変調駆動回路２１よりのパルス電流ｌこよる半導
体レーザ１０のパルス発光光量とパルス電流源膿により
規定されるパルス光量との差を概ね示すと考えられる。This bias'? il: The amount of light emitted by the semiconductor laser 10 due to the flow is controlled by the bias light amount setting device 26 even during recording operation.
During the recording operation when the recording gate signal 102 is on, the output of the error amplifier 22 is approximately equal to the amount of light emitted by the semiconductor laser 10 due to the pulse current l from the modulation drive circuit 21. It is thought that this generally indicates the difference from the pulsed light intensity defined by pus.
従ってこの誤差増幅器２２の出力を記録光景誤差積分器
ｚ４により積分し、変調駆動回路２１が半導体レーザ】
０に供給するパルス電流の値を制御することにより、半
導体レーザ１０のパルス発光光量のみをパルス電流源２
３により規定されるパルス光量とほぼ等しくさせること
ができる。Therefore, the output of this error amplifier 22 is integrated by the recording scene error integrator z4, and the modulation drive circuit 21 is connected to the semiconductor laser.
By controlling the value of the pulsed current supplied to the pulsed current source 2, only the amount of pulsed light emitted from the semiconductor laser 10 is controlled by the pulsed current source 2.
The amount of pulsed light can be made almost equal to the amount of pulsed light defined by 3.
第２図は第１図に示した装置の動作を説明するための各
部の信号波形の例を示す図である。記録ゲート信号１０
２がオンとなり記録データパルス１０１が入力すると半
導体レーザ１０にはバイアス電流供給回路２０よりのバ
イアス電流に加えて変調、駆動回路２１よりパルス電流
が供給され、半導体レーザ１０は弱い一定レベルの発光
に重両ニしてパルス発光を行なう。この半導体レーザ１
０の発光光量は光検出器１４により検出され、光検出器
１４は半導体レーザ１０の発光光量に対応する光検出電
流１０３を出力する。一方、パルス光量規定のためのパ
ルス電流源２３からは光量規定電流パルス１０４が出力
される。本例では誤差増幅器２２において光検出電流１
０３と光量規定電流パルス１０４との差をとりやすくす
るため光量規定電流パルスの極性を光検出器。FIG. 2 is a diagram showing examples of signal waveforms of various parts for explaining the operation of the apparatus shown in FIG. 1. Recording gate signal 10
2 is turned on and the recording data pulse 101 is input, the semiconductor laser 10 is supplied with a pulse current from the modulation and drive circuit 21 in addition to the bias current from the bias current supply circuit 20, and the semiconductor laser 10 emits light at a weak constant level. Pulse light emission is performed in both directions. This semiconductor laser 1
The amount of emitted light of 0 is detected by the photodetector 14, and the photodetector 14 outputs a photodetection current 103 corresponding to the amount of emitted light of the semiconductor laser 10. On the other hand, a light amount regulating current pulse 104 is outputted from the pulse current source 23 for regulating the amount of pulsed light. In this example, in the error amplifier 22, the photodetection current 1
03 and the light amount regulating current pulse 104, the polarity of the light amount regulating current pulse is determined by a photodetector.
流１０３の極性とは逆にしである。The polarity of stream 103 is reversed.
光検出電流１０３のうち半導体レーザ１０の弱い一定レ
ベルの発光によるバイアス発光成分ｉｂは／＜イアスミ
流供給回路２０とバイアスＸ； ｔ Ｗ”Ａ差積分器２
５の働きによりバイアス光量設定器２６より出力される
バイアス規定電流と（極性は逆であるカリ値はほぼ等し
くなっているから、誤差増幅器２２の出力１０５は光検
出電流１０３のうちのパルス発光成分Ｉｐ と光量規定
電流パルス１０４との差を概ね示すものとなる。記録光
量誤差積分器２４は記録ゲート信号１０２がオンの間、
誤差増幅器２２の出力１０５を積分し、その積分出力１
０６を変調駆動回路２１に入力する。光検出・［ＩＬ流
１０３のパルス発光成分Ｉｐの値が光量規定電流パルス
１０４の値より小さけれはその誤差の積分により積分出
力１０６は増大し、変調駆動回路２１より半導体レーザ
１０に供給されるパルス亀流の値を増加させることによ
って半導体レーザ１０のパルス発光光量を増加させる。Of the photodetection current 103, the bias emission component ib due to the weak constant level emission of the semiconductor laser 10 is /<Iasumi current supply circuit 20 and bias X; t W''A difference integrator 2
5, the bias specified current output from the bias light amount setter 26 (the polarity is opposite, but the potency value is almost equal), so the output 105 of the error amplifier 22 is the pulsed light emitting component of the photodetection current 103. It roughly indicates the difference between Ip and the light amount regulating current pulse 104.The recording light amount error integrator 24 is operated while the recording gate signal 102 is on.
The output 105 of the error amplifier 22 is integrated, and the integral output 1
06 is input to the modulation drive circuit 21. Photodetection: [If the value of the pulse emission component Ip of the IL flow 103 is smaller than the value of the light amount regulating current pulse 104, the integral output 106 increases due to the integration of the error, and the pulse supplied from the modulation drive circuit 21 to the semiconductor laser 10 By increasing the value of the tortoise current, the amount of pulsed light emitted by the semiconductor laser 10 is increased.
一方、光検出電流１０３のパルス発光成分Ｉｐの値が光
量規定電流パルス１０４の値より大きければ積分出力１
０６は減少し半導体レーザ１０のパルス発光光量を低下
させる。記録が終了し記録データパルス１０１が入力し
な（なり、記録ゲート信号１０２がオフとなると記録光
量誤差積分器２４は積分動作を停止し積分出力１０６は
記録ゲート信号１０２がオフとなる直前の値のまま保持
される。On the other hand, if the value of the pulsed light emission component Ip of the photodetection current 103 is larger than the value of the light amount regulation current pulse 104, the integral output is 1.
06 decreases, reducing the amount of pulsed light emitted by the semiconductor laser 10. When recording ends and the recording data pulse 101 is no longer input (and the recording gate signal 102 turns off), the recording light amount error integrator 24 stops integrating, and the integral output 106 returns to the value just before the recording gate signal 102 turned off. will be retained as is.
再び記録ゲート信号１０２がオンとなり次の記録が開始
されると記録光量誤差積分器２４はその保持していた値
を増減する形で積分動作を開始するから前回の記録時の
積分出力１０６の最終値を非記録期間中保持することに
より半導体レーザ１ｏのパルス発光光量がパルス電流源
２３により規定されるパルス光量とほぼ等しい状態で記
録が開始されることになる。When the recording gate signal 102 is turned on again and the next recording is started, the recording light amount error integrator 24 starts an integration operation by increasing or decreasing the value it was holding, so the final value of the integral output 106 from the previous recording is By holding the value during the non-recording period, recording is started in a state in which the amount of pulsed light emitted by the semiconductor laser 1o is approximately equal to the amount of pulsed light defined by the pulsed current source 23.
容易に分るように記録動作中の光量規定電流パルス１０
４と光検出電流１０３のパルス幅は、いずれも記録デー
タパルス１０１のパルス幅に等しく、記録データパルス
１０１のパルス幅が変化したり、言己録データパルス１
０１がオンである状態のデユーティ比が変化してもそれ
による半導体レーザ１ｏのパルス発光光量の制御ずれは
発生しない。As can be easily seen, the light amount regulating current pulse 10 during recording operation
4 and the photodetection current 103 are both equal to the pulse width of the recording data pulse 101.
Even if the duty ratio in the state where 01 is on changes, no deviation in control of the amount of pulsed light emitted by the semiconductor laser 1o will occur.
以上の如く本発明によればランダムなパルス幅、パルス
間隔で発生ずる光パルスの光量が安定に制御され温度変
動等の外乱に抗して一定光量の光パルスを発生すること
によって光学的記録再生装置における高品質な情報の記
録が可能となる。As described above, according to the present invention, the light intensity of light pulses generated at random pulse widths and pulse intervals is stably controlled, and optical recording and reproduction is achieved by generating light pulses of a constant light amount against disturbances such as temperature fluctuations. It becomes possible to record high-quality information in the device.
尚、本説明文では説明の都合上一部の例についてのみ述
べたが、本発明の趣旨を逸脱しない範囲での変更は可能
であり、本発明の範囲は上記の例に限定されるものでは
ない。In addition, in this explanatory text, only some examples have been described for convenience of explanation, but changes can be made without departing from the spirit of the present invention, and the scope of the present invention is not limited to the above examples. do not have.
第１図は本発明の光量制御装置の一実施例を示すブロッ
ク図、第２図は第１図に示した装置の動作を説明するた
めの装置各部の信号波形の例を示す図である。
図中、１０は半導体レーザ、１３は記録担体、１４は光
検出器、２０はバイアス電流供給回路、２１は変調駆動
回路、２２は誤差増幅器、２３はパルス電流源、２４は
記録光を仕誤差積分器、２５はバイアス光晴誤差積分器
、２６はバイアス光量設定器である。FIG. 1 is a block diagram showing an embodiment of the light amount control device of the present invention, and FIG. 2 is a diagram showing examples of signal waveforms of various parts of the device to explain the operation of the device shown in FIG. In the figure, 10 is a semiconductor laser, 13 is a record carrier, 14 is a photodetector, 20 is a bias current supply circuit, 21 is a modulation drive circuit, 22 is an error amplifier, 23 is a pulse current source, and 24 is a recording light source. 25 is a bias light error integrator, and 26 is a bias light amount setter.
Claims (1)
体上に照射することにより情報の記録を行なう光学的記
録再生装置において、前記レーザ光源よりの光束の１部
を受けてレーザ光源の発光光量に対応する光電流を出力
する光検出器と、記録時のレーザ光パルス発生時に、レ
ーザ光パルスの強度を規定する量の電流パルスを発生す
るパルス電流源と、前記光検出器よりの光電流と前記パ
ルス電流源よりの規定電流パルスとの差をとり増幅する
誤差増幅器と前記誤差増幅器の出力を積分し保持する積
分器とを備え、前記積分器の出力により前記レーザ光パ
ルスの強度を制御するようにしたことを特徴とする光学
的記録再生装置における光量制御装置。In an optical recording/reproducing device that records information by pulse-modulating the light flux from a laser light source and irradiating it onto an information recording carrier, a portion of the light flux from the laser light source is received to determine the amount of light emitted by the laser light source. a photodetector that outputs a photocurrent corresponding to the intensity of the laser beam pulse, a pulse current source that generates a current pulse of an amount that defines the intensity of the laser beam pulse when a laser beam pulse is generated during recording, and a photocurrent output from the photodetector. and an integrator that integrates and holds the output of the error amplifier, and controls the intensity of the laser light pulse by the output of the integrator. A light amount control device for an optical recording/reproducing device, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57200575A JPS5990242A (en) | 1982-11-16 | 1982-11-16 | Light quantity controller of optical recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57200575A JPS5990242A (en) | 1982-11-16 | 1982-11-16 | Light quantity controller of optical recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5990242A true JPS5990242A (en) | 1984-05-24 |
Family
ID=16426611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57200575A Pending JPS5990242A (en) | 1982-11-16 | 1982-11-16 | Light quantity controller of optical recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5990242A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4734914A (en) * | 1985-03-15 | 1988-03-29 | Olympus Optical Co., Ltd. | Stabilized laser apparatus |
-
1982
- 1982-11-16 JP JP57200575A patent/JPS5990242A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4734914A (en) * | 1985-03-15 | 1988-03-29 | Olympus Optical Co., Ltd. | Stabilized laser apparatus |
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