JPS61125098A - Light output stabilizer - Google Patents
Light output stabilizerInfo
- Publication number
- JPS61125098A JPS61125098A JP59246902A JP24690284A JPS61125098A JP S61125098 A JPS61125098 A JP S61125098A JP 59246902 A JP59246902 A JP 59246902A JP 24690284 A JP24690284 A JP 24690284A JP S61125098 A JPS61125098 A JP S61125098A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- pid
- light source
- circuit
- 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
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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
-
- 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
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
-
- 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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08547—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
【発明の詳細な説明】
発 の技術分
本発明は半導体レーザ等のレーザ光源の出力光部を、自
動的に所望のレベルに制御して安定した光出力を得るよ
うにした光出力安定化装置に関する。[Detailed Description of the Invention] The present invention provides an optical output stabilizing device that automatically controls the output light section of a laser light source such as a semiconductor laser to a desired level to obtain stable optical output. Regarding.
″ と 。 へ
半導体レーザは、駆動電流（電圧）に対して非線形な光
出力特性を示す、このようなレーザ光源から安定した光
出力を得るためには、最適な駆動電流（電圧）の制御を
行うことが必要である。以下、半導体レーザを例にして
本発明および従来技術を説明するが、図面において同一
の構成要素には同一の符合を付して説明を省略する。Semiconductor lasers exhibit nonlinear optical output characteristics with respect to driving current (voltage). In order to obtain stable optical output from such laser light sources, optimal control of driving current (voltage) is required. Hereinafter, the present invention and the prior art will be explained using a semiconductor laser as an example, and the same components in the drawings will be given the same reference numerals and the explanation will be omitted.
第４図は従来の光出力安定化装置（Ａｒｃ）の−例の構
成図である。レーザダイオードＬＤから発生された光束
の一部（ＬＤの裏面から出た光束）はフォトダイオード
ＰＤによって検出され、比較回路３に与えられる。また
、比較回路３には図示しない基準電圧発生回路から基準
電圧Ｖｒｅｆが与えられており、比較結果の信号（誤差
信号）は制御回路に２２に午えられる。FIG. 4 is a configuration diagram of an example of a conventional optical output stabilizing device (Arc). A part of the luminous flux generated from the laser diode LD (the luminous flux emitted from the back surface of the LD) is detected by the photodiode PD and provided to the comparator circuit 3. Further, the comparison circuit 3 is supplied with a reference voltage Vref from a reference voltage generation circuit (not shown), and a comparison result signal (error signal) is sent to the control circuit 22.
制御回路２２は誤差信号が所定の範囲内で安定するよう
にレーザダイオードＬＤを制御する制御信号を出力し、
ドライバ２３はこの制御信号にもとづいてレーザダイオ
ードＬＤを駆動する。The control circuit 22 outputs a control signal to control the laser diode LD so that the error signal is stabilized within a predetermined range,
The driver 23 drives the laser diode LD based on this control signal.
上記のように従来は、レーザダイオードＬＤからの光束
の一部をフォトダイオード（光センｆ）ＦＤで受光し、
比較回路２３から制御回路と、ドライバ２３へと続く閉
ループ制御によってレーザダイオード（レーザ光源）Ｌ
Ｄの発光光量を制御している。従って１発光光量の制御
はこの閉ループを信号が一巡しないとなされないため、
リアルタイム性に欠けるという問題点があった。As mentioned above, conventionally, a part of the luminous flux from the laser diode LD is received by the photodiode (light sensor f) FD,
The laser diode (laser light source) L is controlled by the closed loop control from the comparison circuit 23 to the control circuit and the driver 23.
Controls the amount of light emitted by D. Therefore, the amount of light emitted per flash cannot be controlled until the signal passes through this closed loop.
The problem was that it lacked real-time performance.
、 Ｉ の 目
が本発明は上記の如き従来技術の欠点を克服するために
なされたもので、リアルタイムで光出力安定化を図るこ
とのできる光出力安定化装置を提供することを目的とす
る。, I's eyes
However, the present invention has been made to overcome the drawbacks of the prior art as described above, and an object of the present invention is to provide a light output stabilizing device capable of stabilizing light output in real time.
の
上記の目的を達成するため本発明は、レーザ光源の発光
光量に応じた電気信号を所定の基準レベルと比較するこ
とにより誤差信号を得て、この誤差信号が所定の範囲内
で安定するようにレーザ光源の発光光量を制御する光出
力安定化装置において、誤差信号をＰ Ｉ Ｄ （Ｐｒ
ｏｐｏｒｔｉｏｎａｌ Ｉｎｔｅｇｒａｌａｎｄ Ｄｅ
ｒｉｖａｔｉｖｅ） ＭｍするためＰＩＤ制御手段を設
けたことを特徴とする光出力安定化装置を提供するもの
である。To achieve the above object, the present invention obtains an error signal by comparing an electric signal corresponding to the amount of light emitted from a laser light source with a predetermined reference level, and stabilizes the error signal within a predetermined range. In the optical output stabilization device that controls the amount of light emitted from the laser light source, the error signal is converted to PID (Pr
Portional Integraland De
The present invention provides an optical output stabilizing device characterized in that it is provided with a PID control means for controlling (rivative) Mm.
第１図は本発明の一実施例の概略構成図である。第４図
に示す従来例と異なる点は、比較回路３の出力側には制
御回路２２と並列にＰＩＤ回路２４が設けられ、かつ、
′１ｉＩＩＪ１回路２２から出力された制御信号からＰ
Ｉ Ｄ ４：ｆ号を減じる減算器２５が設けられてい
る点である。上記のように構成されているため、ドライ
バ２３は制Ｗ＠号からＰＩＤ信号を減じた信号にもとづ
いてレーザダイオードＬＤを駆動する。FIG. 1 is a schematic diagram of an embodiment of the present invention. The difference from the conventional example shown in FIG. 4 is that a PID circuit 24 is provided on the output side of the comparator circuit 3 in parallel with the control circuit 22, and
'1iIIJ1 from the control signal output from the circuit 22
ID 4: A subtracter 25 for subtracting the f number is provided. With the above configuration, the driver 23 drives the laser diode LD based on a signal obtained by subtracting the PID signal from the control signal W@.
第２図は第１図に示す実施例を具体化した回路図である
。レーザダイオードＬＤの出力光の一部（特に裏面から
出た光束）はフォトダイオードＰＤにより検出され、光
検出信号は増幅器３で増幅されて制御回路２２を構成す
るウィンドコンパレータ ４に午えられ、あらかじめ設
定されたトド限レベルと比較される。また、ＡＮＤゲー
ト回路５にはウィンドコンパレータ ４を構成する２つ
のコンパレータのそれぞれの出力信号と、クロック信号
発生器６からのクロック信号とが入力されており、その
論理演算出力はアップダウンカウンタ（Ｕ／Ｄカウンタ
）７のアップ端子およびダウン端子に入力される。そし
て、Ｕ／Ｄカウンタ ７のｊｆｌ 力はＤ−Ａコンバー
タ８でアナログ信号に変換され、減算器２５に人力され
る。一方、増幅器３の出力はＰＩＤ回路２４に与えられ
ており、ＰＩＤ回路２４はこれにもとづいてＰＩＤ信号
を出力する。FIG. 2 is a circuit diagram embodying the embodiment shown in FIG. A part of the output light of the laser diode LD (particularly the light flux emitted from the back surface) is detected by the photodiode PD, and the photodetection signal is amplified by the amplifier 3 and sent to the window comparator 4 that constitutes the control circuit 22. It is compared with the set limit level. Further, the output signals of the two comparators constituting the window comparator 4 and the clock signal from the clock signal generator 6 are input to the AND gate circuit 5, and the logical operation output is output from the up/down counter (U /D counter) 7's up and down terminals. Then, the jfl force of the U/D counter 7 is converted into an analog signal by the DA converter 8 and input to the subtracter 25 . On the other hand, the output of the amplifier 3 is given to the PID circuit 24, and the PID circuit 24 outputs a PID signal based on this.
従って、帰還抵抗１１を有する演算増幅器１０には、Ａ
−Ｄコンバータ ８から出力された制御信号からＰＩＤ
信号を減した信号が与えられているので、レーザダイオ
ードＬＤをドライブするトランジスタ１３は［（〃制御
信号）−（ＰＩＤ信号）］によって制御されることにな
る。なお、この演算増幅器１０、抵抗１２およびトラン
ジスタ１３によって第１図のドライバ２３が構成されて
いる。Therefore, in the operational amplifier 10 having the feedback resistor 11, A
- PID from the control signal output from D converter 8
Since the reduced signal is given, the transistor 13 that drives the laser diode LD is controlled by [(control signal)-(PID signal)]. Note that the operational amplifier 10, the resistor 12, and the transistor 13 constitute the driver 23 in FIG.
第３図は本発明を光学的情報記録再生装置に用いた実施
例での第２図に示すＰＩＤ回路の詳細な回路図である。FIG. 3 is a detailed circuit diagram of the PID circuit shown in FIG. 2 in an embodiment in which the present invention is applied to an optical information recording/reproducing apparatus.
図示の如＜、ＡＮＤゲート２Ｂには記録ゲート信号（Ｗ
−ＧＡＴＥ）とクロック信号が与えられており、その出
力はＡＮＤゲート３１に与えられる。また、ＡＮＤゲー
ト３１の他方の入力端子にはインバータ３０を介してＪ
［命令（適時にレーザダイオードの光量調整を実行する
ための信号）が与えられている。従って、再生時には増
幅器３の出力はスイッチ３２を介してＰＩＤ回路に入力
され、記録時には記録ゲート信号がハイレベル（以下°
“Ｈ”という）であって調整命令（ＡＤＪ−ＩＮ）がロ
ーレベル（以下“Ｌ″という）ときにのみＡＮＤゲート
３１からクロック信号が出力され、ＡＤＪ−ＩＮループ
のと、！ｒ（ＡＤＪ−ＩＮがＨ°゛）はＰＩＤは制御し
ない。さらに、ＡＮＤゲー）３１の出力はアナログスイ
ッチ３２に与えられると共にインバータ３３を介してア
ナログスイッチ３４に与えられる。抵抗ｒ、、ｒ２と微
分コンデンサＣ１は微分回路を構成しており、抵抗ｒ３
とアすａグスイッチ３４に並列接続された積分コンデン
サＣ０は積分回路を構成している。このように、１個の
演算増幅器３５を中心にして負帰還回路を構成し、ＰＩ
Ｄ制御を得ている。As shown in the figure, the AND gate 2B has a recording gate signal (W
-GATE) and a clock signal are applied, and the output thereof is applied to an AND gate 31. In addition, the other input terminal of the AND gate 31 is connected to J via the inverter 30.
[A command (a signal to timely adjust the light intensity of the laser diode) is given. Therefore, during playback, the output of the amplifier 3 is input to the PID circuit via the switch 32, and during recording, the recording gate signal is at a high level (hereinafter referred to as °
A clock signal is output from the AND gate 31 only when the adjustment command (ADJ-IN) is at a low level (hereinafter referred to as "L"), and the ADJ-IN loop and ! r (ADJ-IN is H°), PID is not controlled. Further, the output of the AND game 31 is applied to an analog switch 32 and an analog switch 34 via an inverter 33. Resistors r,, r2 and differential capacitor C1 constitute a differential circuit, and resistor r3
An integrating capacitor C0 connected in parallel to the A/A switch 34 constitutes an integrating circuit. In this way, a negative feedback circuit is constructed around one operational amplifier 35, and the PI
D control is obtained.
次に動作を説明する。比較回路３の出力信号は、ウィン
ドコンパレータ、アップダウンカウンタ等により構成さ
れるデジタル制御回路に入力するとともにアナログスイ
ッチ３２を介してＰＩＤ制御回路を構成する差動増幅器
３５に入力する。アナログスイッチ３４はＷ−ＧＡＴＥ
信号、クロック信号を受けて、前記積分制御を所望に制
御する。ＰＴＤ制御出力信号は、前記デジタル制御回路
の出力信号を受けるＤ−Ａコンバータ ８と重畳されツ
ェナーダイオードａ６を介して光源のドライバを制御す
る作用をなす。従って１本実施例によれば、デジタル制
御と併わせ、誤差信号をＰＩＤ制御をしてリアルタイム
な光源の光出力安定化を行うことができるものである。Next, the operation will be explained. The output signal of the comparison circuit 3 is input to a digital control circuit composed of a window comparator, an up/down counter, etc., and is also input via an analog switch 32 to a differential amplifier 35 constituting a PID control circuit. Analog switch 34 is W-GATE
The integral control is controlled as desired by receiving the signal and the clock signal. The PTD control output signal is superimposed on the DA converter 8 which receives the output signal of the digital control circuit, and functions to control the light source driver via the Zener diode a6. Therefore, according to this embodiment, the optical output of the light source can be stabilized in real time by performing PID control on the error signal in addition to digital control.
本発明によれば、特に、光学的情報記録再生装置におい
て情報を記録媒体に記録する際に、従来技術にはないリ
アルタイムでの光出力安定化制御を行う作用をなすもの
で、以下のごとく、再生時のみならず、記録時に極めて
大きな効果を発揮するものである。According to the present invention, in particular, when recording information on a recording medium in an optical information recording/reproducing device, real-time optical output stabilization control, which is not available in the prior art, is performed, as described below. This is extremely effective not only during playback but also during recording.
］ の ′ −
上記の如く本発明では、レーザ光源の発光光量に応じた
電気信号を所定の基準レベルと比較することにより誤差
信号を得て、この誤差信号が所定の範囲内で安定するよ
うにレーザ光源の発光光量を制御する光出力安定化装置
において、誤差信号をＰＩＤ制御するためＰＩＤ制御手
段を設けたので、リアルタイムで光出力の安定化を図る
ことのできる光出力安定化装置を得ることができる。特
にＰＩＤ制御は、正常偏差を零にするのに有効な比例＋
積分制御に微分制御が付加されたものなので、制御量の
変化にすばやく追従することができるようになる。更に
、この効果は、光学的に情報を記録・消去又は再生する
光学的情報記録再生装置において実際に書き込み動作が
行なわれる時に特に顕著である。] - As described above, in the present invention, an error signal is obtained by comparing an electric signal corresponding to the amount of light emitted from a laser light source with a predetermined reference level, and this error signal is stabilized within a predetermined range. To obtain an optical output stabilizing device for controlling the amount of light emitted from a laser light source, which can stabilize the optical output in real time by providing a PID control means for PID controlling an error signal. I can do it. In particular, PID control is a proportional +
Since differential control is added to integral control, it is possible to quickly follow changes in the control amount. Furthermore, this effect is particularly noticeable when a write operation is actually performed in an optical information recording/reproducing device that optically records, erases, or reproduces information.
第１図は本発明の一実施例の概略構成図、第２図は同実
施例を具体化した回路図、第３図は第２図に示すＰＩＤ
回路の詳細な回路図、第４図は従来の光出力安定化装置
の一例の構成図である。
ＬＤ・・・レーザダイオード、 ＰＤ・・・フォトダイ
オード、 ４・・・ウィンドコンパレータ、 ５・
・・ＡＮＤゲート回路、 ３・・・比較回路、 ６
・・・クロック信号発生器、 ７・・・Ｕ／Ｄカウン
タ、 ８・・・Ａ／Ｄコンバータ、２２・・・制御回
路、 ２３・・・ドライバ、２４・・・ＰＩＤ回路。Fig. 1 is a schematic configuration diagram of an embodiment of the present invention, Fig. 2 is a circuit diagram embodying the embodiment, and Fig. 3 is a PID shown in Fig. 2.
A detailed circuit diagram of the circuit, FIG. 4, is a configuration diagram of an example of a conventional optical output stabilizing device. LD...Laser diode, PD...Photodiode, 4...Window comparator, 5.
...AND gate circuit, 3...comparison circuit, 6
...Clock signal generator, 7.. U/D counter, 8.. A/D converter, 22.. Control circuit, 23.. Driver, 24.. PID circuit.
Claims (1)
を受けて発光光量に応じた電気信号を出力する光検出器
と、この光検出器からの電気信号を所定の基準レベルと
比較して誤差信号を出力する比較手段と、この誤差信号
が所定の範囲内で安定するように前記レーザ光源を制御
するための制御信号を出力する制御手段と、前記誤差信
号をＰＩＤ制御するためのＰＩＤ信号を出力するＰＩＤ
制御手段と、前記制御信号とＰＩＤ信号にもとづいて前
記レーザ光源を駆動するドライバとを備える光出力安定
装置。(1) A laser light source, a photodetector that receives part of the luminous flux from this laser light source and outputs an electrical signal according to the amount of emitted light, and compares the electrical signal from this photodetector with a predetermined reference level. a control means for outputting a control signal for controlling the laser light source so that the error signal is stabilized within a predetermined range; and a PID for performing PID control on the error signal. PID that outputs the signal
A light output stabilizing device comprising: a control means; and a driver that drives the laser light source based on the control signal and the PID signal.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59246902A JPH067612B2 (en) | 1984-11-21 | 1984-11-21 | Light output stabilizer |
| DE3546645A DE3546645C2 (en) | 1984-11-20 | 1985-11-19 | |
| DE3546599A DE3546599C2 (en) | 1984-11-20 | 1985-11-19 | |
| DE19853541002 DE3541002A1 (en) | 1984-11-20 | 1985-11-19 | OPTICAL INFORMATION RECORDING AND PLAYBACK STORAGE SYSTEM |
| US07/169,106 US4858219A (en) | 1984-11-20 | 1988-03-09 | Optical information recording reproducing memory system with both power control and optical irradiation inhibiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59246902A JPH067612B2 (en) | 1984-11-21 | 1984-11-21 | Light output stabilizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61125098A true JPS61125098A (en) | 1986-06-12 |
| JPH067612B2 JPH067612B2 (en) | 1994-01-26 |
Family
ID=17155442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59246902A Expired - Fee Related JPH067612B2 (en) | 1984-11-20 | 1984-11-21 | Light output stabilizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH067612B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009038081A (en) * | 2007-07-31 | 2009-02-19 | Nippon Avionics Co Ltd | Semiconductor laser drive circuit and laser welding power supply |
| JP2014154835A (en) * | 2013-02-13 | 2014-08-25 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmitter |
| JP2014165392A (en) * | 2013-02-26 | 2014-09-08 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmitter, and control method thereof |
-
1984
- 1984-11-21 JP JP59246902A patent/JPH067612B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009038081A (en) * | 2007-07-31 | 2009-02-19 | Nippon Avionics Co Ltd | Semiconductor laser drive circuit and laser welding power supply |
| JP2014154835A (en) * | 2013-02-13 | 2014-08-25 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmitter |
| JP2014165392A (en) * | 2013-02-26 | 2014-09-08 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmitter, and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH067612B2 (en) | 1994-01-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |