JPS5864641A - Controlling system for optical pickup - Google Patents

Controlling system for optical pickup

Info

Publication number
JPS5864641A
JPS5864641A JP56162060A JP16206081A JPS5864641A JP S5864641 A JPS5864641 A JP S5864641A JP 56162060 A JP56162060 A JP 56162060A JP 16206081 A JP16206081 A JP 16206081A JP S5864641 A JPS5864641 A JP S5864641A
Authority
JP
Japan
Prior art keywords
kick pulse
kick
light beam
accordance
equilibrium point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP56162060A
Other languages
Japanese (ja)
Inventor
Shinichi Nakamura
伸一 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56162066A priority Critical patent/JPS5864645A/en
Priority to JP56162065A priority patent/JPS5864644A/en
Priority to JP56162062A priority patent/JPS5864642A/en
Priority to JP56162060A priority patent/JPS5864641A/en
Priority claimed from JP56162065A external-priority patent/JPS5864644A/en
Publication of JPS5864641A publication Critical patent/JPS5864641A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085Disposition 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
    • G11B7/08505Methods for track change, selection or preliminary positioning by moving the head

Landscapes

  • Moving Of Head For Track Selection And Changing (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To obtain an exact extent of a kick even if a light beam shifts from the equilibrium point by changing the wave-form of kick pulse for jumping over a track in accordance with the shift of the light beam in the radial direction of a disk. CONSTITUTION:When the position of the lens of an optical pickup is changed so as to deflect a light beam, spring force returning the lens to the equilibrium point is increased in accordance with the shift from the equilibrium point, so the wave-form of kick pulse is changed in accordance with the shift from the equilibrium point. Kick pulse generated from a kick pulse generating circuit 14 is subjected to amplitude modulation through a kick pulse modulator 15 in accordance with the driving voltage of a driving coil 13.

Description

【発明の詳細な説明】 本発明は回転ディスクの情報を光学的に検知する光学式
ピックアップの制御方式に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for an optical pickup that optically detects information on a rotating disk.

光ディスク装置等で用−られる光学式ピックアップは、
ディスク上の情報トラック會正確にトレースするように
トラッキングサーボ系を備えたものが多φ。一方ビツク
アップ全体はディスクの半径方向く移動可能であって、
例えば送シネジ・送シモータ等によシピックアップを変
位させ所望のトラックに移ることができる。これに対し
、より簡単にピックアップの変位を可能とするため、上
記トラッキングサーボ系にパルス状のキック信号を与え
る方法が考えられる。
Optical pickups used in optical disc devices, etc.
Many are equipped with a tracking servo system to accurately trace information on the disk. On the other hand, the entire pickup is movable in the radial direction of the disk,
For example, the pickup can be moved to a desired track by displacing the pick-up using a feed screw, feed motor, or the like. On the other hand, in order to more easily displace the pickup, a method can be considered in which a pulsed kick signal is applied to the tracking servo system.

すなわち、トラッキングサーボ可能なビッタアップは、
光ビームをディスクの半径方向へ偏向する手段を有して
いるので、この偏向子ffKよす強制的に光ビームを複
数トラック飛ばせる。
In other words, the bit-up that allows tracking servo is
Since it has means for deflecting the light beam in the radial direction of the disk, the light beam can be forced to fly over a plurality of tracks by this deflector ffK.

このような偏向手段の代表例を第1図に示す。A typical example of such a deflection means is shown in FIG.

図において、ディスク1はピックアッグレ/ズ2を介し
*v−f−ビーム値X冊IM −1h−イいス−し°・
・ノクアツプレンズ2は板バネ4に固定され、レンズ2
は磁性体5を有する。磁性体5にはコイル6が巻装置さ
れており、コ゛イル6に電流が流れるとその大きさ及び
方向によって板バネ4が変位する。
In the figure, the disk 1 is transferred via the pick-up lens 2 to *v-f-beam value
・The Nokuatsu lens 2 is fixed to the leaf spring 4, and the lens 2
has a magnetic body 5. A coil 6 is wound around the magnetic body 5, and when a current flows through the coil 6, the leaf spring 4 is displaced depending on the magnitude and direction of the current.

板バネ4の変位に伴ないレンズ2も変位するためレーザ
ービーム3はディスクlの半径方向に偏向される。この
・場合、板バネ4は平衡点からのずれXに対し、f ’
 k x (k *比例定数)なる力會発生する。それ
故、いまコイル6に同一の波高値及びパルス幅からなる
キック信号を与えんとき、平衡点からのずれの位置に応
じて実際の変位量が異なってしまう。したがって、ピッ
クアップから照射されるレーザービームが平衡点からず
れて−れば、このずれに応じて飛ばすトラック数が変わ
ってくる。同様に飛ばす方向に関しても平衡点からより
ずらず方向には小さく、一方平衡点に戻す方向には大き
く飛ぶことになる。
Since the lens 2 is also displaced as the leaf spring 4 is displaced, the laser beam 3 is deflected in the radial direction of the disk l. In this case, the leaf spring 4 is f' for the deviation X from the equilibrium point.
A force of k x (k * proportionality constant) is generated. Therefore, when a kick signal having the same peak value and pulse width is applied to the coil 6, the actual amount of displacement will differ depending on the position of deviation from the equilibrium point. Therefore, if the laser beam irradiated from the pickup deviates from the equilibrium point, the number of tracks to be skipped will change depending on this deviation. Similarly, regarding the direction of flight, if the ball does not deviate from the equilibrium point, the ball will fly small, while if it returns to the equilibrium point, the ball will fly greatly.

本発明は上記事情に鑑みて為されたもので、光ビームの
平衡点からのずれ及びキックの方向の影響を除き正確な
キックを行なうことができる光学式ピックアップの制御
方式を提供することを目的とする。
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control system for an optical pickup that allows accurate kicking by eliminating the deviation of the light beam from the equilibrium point and the influence of the direction of the kick. shall be.

第2図に本発明の一実施例を示す。図は光学式ピックア
ップのトラッキングサーボ系を示すもので、10はディ
スクからの反射レーザービームが収束される4分割フォ
トダイオード、llはフォトダイオード10の4出力信
号を演算してレーザービームの(平衡点からの)ディス
ク半径方向への誤差信号を検出するラジアシ誤′差検出
器、12は一差信号に応じたコイル駆動信号を出力する
2ジアジサーボアンプ、13はレーザービームを偏向す
るためのラジアルドライブコイルである。
FIG. 2 shows an embodiment of the present invention. The figure shows the tracking servo system of an optical pickup. 10 is a 4-split photodiode on which the laser beam reflected from the disk is converged, 11 is a 4-part photodiode that calculates the 4 output signals of the photodiode 10, and the balance point of the laser beam is calculated. 12 is a 2-dia radial servo amplifier that outputs a coil drive signal according to the difference signal; 13 is a radial servo amplifier for deflecting the laser beam; It is a drive coil.

上記のようなトラッキングサーボ系に加えて、キックパ
ルス発生回路14が設けられる。このキックパルス発生
回路14は、キック指令に応じて所定幅・所定波高値の
キックパルスVINを発生するものである。
In addition to the tracking servo system as described above, a kick pulse generation circuit 14 is provided. The kick pulse generation circuit 14 generates a kick pulse VIN having a predetermined width and a predetermined peak value in response to a kick command.

キックパルス■INFiキツクハルス変111i)15
に供給され、レーザービームの平衡点からのずれ(ピッ
クアップのラジアル方向へのずれ)及びキックの方向に
応じてその波高値を修正される。この修正されたキック
パルスYour  が検出器11の出力する誤差信号に
加算されてラジアルサーボアンプ12に供給される。
Kick Pulse ■INFi Kitsukuharushen 111i) 15
The peak value is corrected according to the deviation of the laser beam from the equilibrium point (deviation in the radial direction of the pickup) and the direction of the kick. This corrected kick pulse Your is added to the error signal output from the detector 11 and supplied to the radial servo amplifier 12.

キックパルスv■Nの修正のウチレーザービームの平衡
点からのずれについては、−一パスフィルタ16の出力
QIHにより行なわれる。これは、ラジアルサーボアン
プ12の出力であるコイル駆動゛離圧はほぼピックアッ
プのずれを反映しており、これをローパスフィルタ16
を介することによりノイズ成分を除去して用いている。
Correction of the kick pulse vN from the equilibrium point of the laser beam is carried out by the output QIH of the -1 pass filter 16. This is because the coil drive separation pressure, which is the output of the radial servo amplifier 12, almost reflects the pickup deviation, and this is reflected by the low-pass filter 16.
The noise component is removed by using the filter.

第3図はキックパルス変調器の一例を示している。この
回路は、ローパスフィルタ16の出力CINを閾値とし
て入力キックパルスVINの波高値t−変化できるよう
になっているO M3図の回路の動作を示す114図を参照すると、キッ
クパルス■xNは一パヤスのときディスクの戻り方向ヘ
キツクし、+パ〃スで進み方向へ斧ツタするものとする
。また信号0!肩は十のとき進み方向へのピックアップ
の変位、−のとき員り方向への変位をあられしているも
のとする。本実施例で祉キックパルスVtsの幅で、飛
ばされるトラック数を決めている。  ′ 第4図において、期間T1では、ピックアップは平衡点
よシ戻シ方向にずれている。このときバネは平衡点の方
向へすなわち進み方向へカが働いているので、Vout
  は進み方向へのキックパルスの波高値を小さくして
いる。期間T、では、ピックアップが平衡点よシ進み方
向へずれているので、進み方向のキックパルスの波高値
をより大きくしている。期間Tsではピックアップが進
み方向へずれているので戻り方向のキックパルスの波高
値は小さくしている。期間T、ではピンクアップが戻り
方向へ変わったので、戻夛方向のキックパレスの波高値
はより大きくしている。
FIG. 3 shows an example of a kick pulse modulator. This circuit is designed to be able to change the peak value t of the input kick pulse VIN using the output CIN of the low-pass filter 16 as a threshold. When making a payasu, the disk moves in the return direction, and when making a + pass, it moves in the forward direction. Signal 0 again! When the shoulder is 10, it is assumed that the pickup is displaced in the forward direction, and when it is -, it is assumed that the pickup is displaced in the upward direction. In this embodiment, the number of tracks to be skipped is determined by the width of the kick pulse Vts. ' In FIG. 4, during period T1, the pickup deviates from the equilibrium point in the backward direction. At this time, the force is acting on the spring in the direction of the equilibrium point, that is, in the advancing direction, so Vout
reduces the peak value of the kick pulse in the forward direction. In period T, the pickup is shifted from the equilibrium point in the forward direction, so the peak value of the kick pulse in the forward direction is made larger. During the period Ts, the pickup is shifted in the forward direction, so the peak value of the kick pulse in the return direction is made small. In period T, the pink-up has changed to the return direction, so the wave height value of the kick palace in the return direction is made larger.

このように、本実施例によれば、ピックアップのずれ及
びキック方向に応じてパルス波高値を変化させ、正確な
キック量を得ることができる。したがって、ポーズ、早
送夛、サーチ等のトラック飛ばしを正確に行うことがで
きる。
In this way, according to this embodiment, the pulse height value can be changed according to the pickup deviation and the kick direction, and an accurate kick amount can be obtained. Therefore, track skipping such as pause, fast-forwarding, and search can be performed accurately.

なお、上記実施例において、キックパルスVxaはキッ
ク量に応じてその波高値が異なるものとし、01Nによ
りこのキックパルスのバシス幅を変化させることもでき
る。
In the above embodiment, it is assumed that the kick pulse Vxa has a different peak value depending on the amount of kick, and the bass width of this kick pulse can also be changed by 01N.

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

第1図は光ビーム偏向手段を示す図、第2図は本発明の
一実施例を示す図、第3図は本発明の一実施例の部分回
路構成図、第4図は本発明の一実施例の動作を説明する
九めの波形図である。 1.1・・・ラジアル誤差検出器 12・・・ラジアルサーボアンプ 13・・ラジアルドライブコイル 14・・・キックパルス発生器 15・・キックパルス変調器 16・・・ローパスフィルタ 第  ■  図 第2図
FIG. 1 is a diagram showing a light beam deflection means, FIG. 2 is a diagram showing an embodiment of the present invention, FIG. 3 is a partial circuit configuration diagram of an embodiment of the present invention, and FIG. 4 is a diagram showing an embodiment of the present invention. FIG. 9 is a ninth waveform diagram illustrating the operation of the embodiment. 1.1... Radial error detector 12... Radial servo amplifier 13... Radial drive coil 14... Kick pulse generator 15... Kick pulse modulator 16... Low pass filter No.

Claims (2)

【特許請求の範囲】[Claims] (1)  はぼ同心円的な情報トラック上に情報を記録
した回転ディスクに光ビームを照射して前記情報を読み
取るとともに、前記光ビームの前記ディスク半径方向へ
のずれを示す誤差信号を検出する手段と、この手段によ
)検出され九−差信号に応じて前記光ビームを偏向させ
る偏向手段とを舎むトラッキングサーが可能な光学式ピ
ックアップにおいて、前記光ビームが複数の情報トラッ
クを飛びこすためのキックパルスを発生する手段と、こ
の手段によ多発生されたキックパルスの波形を前記誤差
信号に応じて変形する手段とを設け、この手段によ〕変
形され喪中ツクパルスを前記偏向手段に印加することt
−特徴とする光学式ピックアップの制御方式。
(1) Means for illuminating a rotating disk on which information is recorded on substantially concentric information tracks with a light beam to read the information, and detecting an error signal indicating a deviation of the light beam in the radial direction of the disk. and a deflection means for deflecting the light beam in accordance with a nine-difference signal detected by this means. means for generating a kick pulse, and means for transforming the waveform of the kick pulse generated by this means in accordance with the error signal, and applying the modified kick pulse to the deflection means. things to do
-Characteristic optical pickup control method.
(2)  キックパルスの変形は、キックパルスの高さ
又は幅を変化するものである特許請求の範囲第1項記載
の光学式ピックアップの制御方式。
(2) The optical pickup control system according to claim 1, wherein the kick pulse is modified by changing the height or width of the kick pulse.
JP56162060A 1981-10-13 1981-10-13 Controlling system for optical pickup Pending JPS5864641A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP56162066A JPS5864645A (en) 1981-10-13 1981-10-13 Controllihg system for optical disk search
JP56162065A JPS5864644A (en) 1981-10-13 1981-10-13 Optical disk search control system
JP56162062A JPS5864642A (en) 1981-10-13 1981-10-13 Controlling system for optical pickup
JP56162060A JPS5864641A (en) 1981-10-13 1981-10-13 Controlling system for optical pickup

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56162065A JPS5864644A (en) 1981-10-13 1981-10-13 Optical disk search control system
JP56162060A JPS5864641A (en) 1981-10-13 1981-10-13 Controlling system for optical pickup

Publications (1)

Publication Number Publication Date
JPS5864641A true JPS5864641A (en) 1983-04-18

Family

ID=26487984

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56162060A Pending JPS5864641A (en) 1981-10-13 1981-10-13 Controlling system for optical pickup

Country Status (1)

Country Link
JP (1) JPS5864641A (en)

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