JPS63181124A - Optical disk device - Google Patents
Optical disk deviceInfo
- Publication number
- JPS63181124A JPS63181124A JP1290587A JP1290587A JPS63181124A JP S63181124 A JPS63181124 A JP S63181124A JP 1290587 A JP1290587 A JP 1290587A JP 1290587 A JP1290587 A JP 1290587A JP S63181124 A JPS63181124 A JP S63181124A
- Authority
- JP
- Japan
- Prior art keywords
- speed
- actuator
- focus lens
- coarse
- detector
- 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
- 230000003287 optical effect Effects 0.000 title claims description 13
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000001133 acceleration Effects 0.000 abstract description 3
- 230000004069 differentiation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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
- G11B7/08—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
- G11B7/0857—Arrangements for mechanically moving the whole head
- G11B7/08582—Sled-type positioners
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、光ディスク、例えばコンパクト・ディスクや
ビデオ・ディスクのアクセス装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an access device for optical discs, such as compact discs and video discs.
従来の技術
光ディスク・プレーヤでは、ピックアップ基台を駆動す
るりニヤモータ等の粗アクチュエータと、そのピックア
ップ基台に搭載されたレンズを駆動する精アクチュエー
タとの協調動作によって光ビームの位置決めを行なって
いる０例えば、通常の光ディスク・プレーヤでは、アク
セス動作時に、まず粗アクチュエータによって概略の目
標位置にピックアップ基台を位置決めし、次に、その基
台に搭載されたレンズを駆動する精アクチュエータによ
り光ビームを目標トラックに位置決めするようになって
いる。しかし、粗アクチュエータのアクセス動作が高速
になると、その加速度により、精アクチュエータのレン
ズが振られてしまい、そのため目標付近で精アクチュエ
ータが振動するという問題があった。Conventional technology In optical disc players, the position of the light beam is determined by the cooperative operation of a coarse actuator such as a linear motor that drives a pickup base, and a fine actuator that drives a lens mounted on the pickup base. For example, in a normal optical disc player, during an access operation, a coarse actuator first positions the pickup base at an approximate target position, and then a fine actuator that drives a lens mounted on the base directs the light beam to the target position. It is designed to be positioned on the track. However, when the access operation of the coarse actuator becomes high speed, the lens of the fine actuator is shaken due to the acceleration, which causes the problem that the fine actuator vibrates near the target.
これに対して、精アクチュエータの中立点検出器を用い
て、精アクチュエータを機械的中点に位置サーボをかけ
てロックすることが考えられるが、この中立点検出器は
構造が複雑になったり、ＤＣドリフトや経時変化があう
たりして大きな問題点となる。また、その問題点を解決
するための特開昭６１−２１４２３０の光ディスク装置
では、精アクチュエータの検出器の出力をアクセス直前
にホールドした信号と比較して位置サーボをかけるため
、ＤＣドリフトや経時変化の問題点は解消するが、ホー
ルド回路が新に必要となり複雑となるという問題点があ
った。On the other hand, it is conceivable to use a neutral point detector of the precision actuator to lock the precision actuator by applying a position servo to the mechanical midpoint, but this neutral point detector has a complicated structure, DC drift and changes over time become a major problem. In order to solve this problem, the optical disk device disclosed in Japanese Patent Application Laid-Open No. 61-214230 applies position servo by comparing the output of the detector of the precision actuator with the signal held just before access, so DC drift and changes over time are avoided. Although this problem is solved, there is a problem in that a new hold circuit is required and it becomes complicated.
発明が解決しようとする問題点
以上述べたように、従来の技術では、例えばＤＣドリフ
トの発生による動作不安点の問題や、ホールド回路の付
加による構成の複雑化等の問題点があった。Problems to be Solved by the Invention As described above, the conventional technology has problems such as unstable operation due to the occurrence of DC drift, and complication of the configuration due to the addition of a hold circuit.
問題点を解決するための手段
本発明の光ディスク装置は、粗アクチュエータ上にフォ
ーカスレンズを取り付けた精アクチュエータを構成し、
かつその精アクチュエータの動きを検出する検出器を設
け、アクセス動作を行なうために前記粗アクチュエータ
を駆動した時、その駆動期間中、前記検出器の出力信号
から速度成分を抽出して、この信号を前記精アクチュエ
ータに帰還する速度サーボ・ループを構成する様にする
ことを特徴とする。Means for Solving the Problems The optical disk device of the present invention comprises a fine actuator in which a focus lens is attached on a coarse actuator,
and a detector is provided to detect the movement of the fine actuator, and when the coarse actuator is driven to perform an access operation, a velocity component is extracted from the output signal of the detector during the driving period, and this signal is A speed servo loop is configured to feed back to the fine actuator.
作用
この構成により、アクセスのため粗アクチュエータが高
速で移動して振動が発生しても、フォーカスレンズを取
り付けた精アクチュエータにかけられている速度サーボ
の作用により、速度基準信号を０とすることにより、フ
ォーカスレンズの速度を０とする、すなわちフォーカス
レンズの振動をおさえることができる。With this configuration, even if vibration occurs due to the coarse actuator moving at high speed for access, the speed reference signal is set to 0 by the action of the speed servo applied to the fine actuator to which the focus lens is attached. The speed of the focus lens can be set to 0, that is, vibration of the focus lens can be suppressed.
実施例
以下本発明の一実施例の光ディスク装置について、図面
を参照しながら説明する。Embodiment Hereinafter, an optical disc device according to an embodiment of the present invention will be described with reference to the drawings.
図は本発明の光ディスク装置の一実施例を示す構成図で
ある０図において、１はディスク、２ａはフォーカスレ
ンズ、２ｂはフォーカスレンズ２８ｅ支持するダンパ、
２ｃはフォーカスレンズ２ａをトラッキング方向に駆動
する駆動コイルである。３は上記フォーカスレンズ２ａ
、ダンパ２ｂ、駆動コイル２Ｃを含んで構成されるピッ
クアツプ２全体を載せるためのピックアップ基台で、リ
ニヤモータ４によって駆動される。５はピックアップ基
台３上に固定されたフォーカスレンズ２ａの位置を検出
するための位置センサで、その位置の出力信号はコンデ
ンサ６ａｓ抵抗６ｂで構成される微分回路６によって速
度信号Ｖ、に変換される。速度信号ｖｖは減算器８によ
って速度基準信号７のｖｓと比較されて速度誤差信号ｖ
６を発生する。速度誤差信号ｖ０は位相補償回路９を経
て電力増幅回路１０により増幅されて駆動コイル２Ｃに
速度誤差に対応した電力を供給する。すなわち、上記位
置センサ５、微分回路６、減算器８、位相補償回路９、
電力増幅回路ｌＯ１及び駆動コイル２Ｃで速度制御ルー
プを構成する。なお本構成図においてディスク１とフォ
ーカスレンズ２ａとの焦点制御を行なうフォーカスサー
ボのブロックは省略しているが、常にフォーカスサーボ
は安定にかかった状態であると仮定している。The figure is a block diagram showing one embodiment of the optical disk device of the present invention. In figure 0, 1 is a disk, 2a is a focus lens, 2b is a damper that supports the focus lens 28e,
2c is a drive coil that drives the focus lens 2a in the tracking direction. 3 is the focus lens 2a mentioned above.
, a damper 2b, and a drive coil 2C, on which the entire pickup 2 is mounted, and is driven by a linear motor 4. Reference numeral 5 denotes a position sensor for detecting the position of the focus lens 2a fixed on the pickup base 3, and the output signal at that position is converted into a speed signal V by a differentiating circuit 6 composed of a capacitor 6as and a resistor 6b. Ru. The speed signal vv is compared with the speed reference signal 7 by a subtracter 8 to obtain a speed error signal v.
Generates 6. The speed error signal v0 passes through the phase compensation circuit 9, is amplified by the power amplifier circuit 10, and supplies power corresponding to the speed error to the drive coil 2C. That is, the position sensor 5, the differential circuit 6, the subtracter 8, the phase compensation circuit 9,
A speed control loop is configured by the power amplification circuit IO1 and the drive coil 2C. In this configuration diagram, a focus servo block for controlling the focus between the disk 1 and the focus lens 2a is omitted, but it is assumed that the focus servo is always in a stable state.
リニヤモータ４による粗アクセス動作直前に図に示す速
度ｉｎループを構成することにより、フォーカスレンズ
２ａの速度を速度基準信号７のｖｓと対応した速度に制
御することができる。つまり、ｖｓ３０とした時は、フ
ォーカスレンズ２ａの速度を０とすることができる。By configuring the speed in loop shown in the figure immediately before the rough access operation by the linear motor 4, the speed of the focus lens 2a can be controlled to a speed corresponding to vs of the speed reference signal 7. That is, when the speed is set to vs30, the speed of the focus lens 2a can be set to 0.
すなわち、粗アクセス動作中は通常のトラッキングサー
ボ動作から、速度基準０の速度制御動作に切り換えるこ
とにより、ピックアップ基台３に対してフォーカスレン
ズ２ａの速度を０とする、いいかえればロックすること
ができる。つまり、粗アクセス動作の開始、停止によっ
て発生する大きな加速度、またはピックアップ基台３の
走行中に発生する振動等でフォーカスレンズ２ａが加振
されでも、上記速度制御によって速度が０に制御されて
振動が抑圧されるため、粗アクセス動作が終了した後、
安定にトラッキングサーボに引き込むことができる。That is, by switching from the normal tracking servo operation to the speed control operation with a speed reference of 0 during the rough access operation, the speed of the focus lens 2a relative to the pickup base 3 can be set to 0, or in other words, it can be locked. . In other words, even if the focus lens 2a is vibrated due to large acceleration caused by starting or stopping the rough access operation or vibration generated while the pickup base 3 is traveling, the speed is controlled to 0 by the speed control described above and the vibration is caused. is suppressed, so after the coarse access operation is completed,
It can be stably pulled into the tracking servo.
以上本発明の実施例では、速度信号を得るのに、位置信
号の直流成分を遮断するＣとＲで構成される微分回路に
よったが、直接速度信号を得る速度検出コイル等を用い
ても良い。In the above embodiments of the present invention, a differentiating circuit composed of C and R that blocks the DC component of the position signal is used to obtain the speed signal, but a speed detection coil or the like that directly obtains the speed signal may also be used. good.
発明の効果
以上述べたように、本発明では粗アクセスの開始、停止
及びその期間中に発生する精アクチュエータの振動を簡
単な検出器によって抑圧することができ、かつ検出器の
出力信号の直流成分を遮断でき、検出器の経時変化や、
ドリフト、温度変化に対しても強くする（影響を受けな
い）ことができるため、安定な光ディスク装置を実現す
ることができる。Effects of the Invention As described above, in the present invention, it is possible to suppress the vibration of the fine actuator that occurs during the start and stop of coarse access and during that period, and to suppress the DC component of the output signal of the detector. It can block the deterioration of the detector over time,
Since it can be made resistant to (not affected by) drift and temperature changes, a stable optical disc device can be realized.
図は本発明の一実施例を説明する構成図である。
２ａ・・・・・・フォーカスレンズ、２ｂ・・・・・・
ダンパ、２ｃ・・・・・・駆動コイル、３・・・・・・
ピックアンプ基台、５・・・・・・位置センサ、６・・
・・・・微分回路、８・・・・・・減算器、９・・・・
・・位相補償回路、１０・・・・・・電力増幅回路。The figure is a configuration diagram illustrating an embodiment of the present invention. 2a...Focus lens, 2b...
Damper, 2c... Drive coil, 3...
Pick amplifier base, 5...Position sensor, 6...
... Differential circuit, 8 ... Subtractor, 9 ...
...Phase compensation circuit, 10...Power amplifier circuit.
Claims (3)
けた精アクチュエータを構成して光スポットの位置決め
をする光ディスク装置であって、前記精アクチュエータ
の動きを検出する検出器を設け、アクセス動作を行なう
ために前記粗アクチュエータを駆動した時、その駆動期
間中、前記検出器の出力信号から速度成分を抽出して、
この信号を前記精アクチュエータに帰還する速度サーボ
・ループを構成することを特徴とする光ディスク装置。(1) An optical disk device that positions a light spot by configuring a fine actuator in which a focus lens is attached to a coarse actuator, and a detector is provided to detect the movement of the fine actuator, and the fine actuator is provided with a detector to detect the movement of the fine actuator. When the coarse actuator is driven, extract a velocity component from the output signal of the detector during the driving period,
An optical disk device characterized in that a speed servo loop is configured to feed back this signal to the precision actuator.
い、その出力をコンデンサによって直流成分、または超
低周波成分を遮断して速度信号を得ることを特徴とする
特許請求の範囲第（１）項に記載の光ディスク装置。(2) Claim (1) characterized in that a position sensor or a distance sensor is used as the detector, and a speed signal is obtained by blocking the direct current component or extremely low frequency component of the output with a capacitor. The optical disc device described in .
特徴とする特許請求の範囲第（１）項または第（２）項
のいずれかに記載の光ディスク装置。(3) The optical disc device according to claim 1 or 2, wherein the speed reference of the speed servo loop is set to 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62012905A JPH0775077B2 (en) | 1987-01-22 | 1987-01-22 | Optical disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62012905A JPH0775077B2 (en) | 1987-01-22 | 1987-01-22 | Optical disk device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63181124A true JPS63181124A (en) | 1988-07-26 |
| JPH0775077B2 JPH0775077B2 (en) | 1995-08-09 |
Family
ID=11818378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62012905A Expired - Fee Related JPH0775077B2 (en) | 1987-01-22 | 1987-01-22 | Optical disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0775077B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03152725A (en) * | 1989-11-08 | 1991-06-28 | Hitachi Ltd | Optical information recording and reproducing device |
| US5673240A (en) * | 1996-03-18 | 1997-09-30 | Nec Corporation | Seek control circuit for suppressing vibration of objective lens in optical head during seek operation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5774839A (en) * | 1980-10-25 | 1982-05-11 | Nippon Telegr & Teleph Corp <Ntt> | Optical head |
| JPS5794940A (en) * | 1980-12-05 | 1982-06-12 | Fujitsu Ltd | Optical disk device |
| JPS61222035A (en) * | 1985-03-28 | 1986-10-02 | Matsushita Electric Ind Co Ltd | Optical information recording and reproducing device |
-
1987
- 1987-01-22 JP JP62012905A patent/JPH0775077B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5774839A (en) * | 1980-10-25 | 1982-05-11 | Nippon Telegr & Teleph Corp <Ntt> | Optical head |
| JPS5794940A (en) * | 1980-12-05 | 1982-06-12 | Fujitsu Ltd | Optical disk device |
| JPS61222035A (en) * | 1985-03-28 | 1986-10-02 | Matsushita Electric Ind Co Ltd | Optical information recording and reproducing device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03152725A (en) * | 1989-11-08 | 1991-06-28 | Hitachi Ltd | Optical information recording and reproducing device |
| US5673240A (en) * | 1996-03-18 | 1997-09-30 | Nec Corporation | Seek control circuit for suppressing vibration of objective lens in optical head during seek operation |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0775077B2 (en) | 1995-08-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |