JPS60121578A - Tracking controller - Google Patents
Tracking controllerInfo
- Publication number
- JPS60121578A JPS60121578A JP22873083A JP22873083A JPS60121578A JP S60121578 A JPS60121578 A JP S60121578A JP 22873083 A JP22873083 A JP 22873083A JP 22873083 A JP22873083 A JP 22873083A JP S60121578 A JPS60121578 A JP S60121578A
- Authority
- JP
- Japan
- Prior art keywords
- record carrier
- signal
- moving
- track
- detecting
- 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
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
- G11B33/08—Insulation or absorption of undesired vibrations or sounds
-
- 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
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0946—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration
Landscapes
- Moving Of The Head To Find And Align With The Track (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は記録担体上に記録されている信号を再生するあ
るいは記録担体上に信号を記録する記録再生装置に関す
るものであり、特に記録されている信号トラックあるい
は信号を記録する為に予め設けられた追跡用トラック（
以下、信号トラ・ンクと追跡用トラックを含めて単にト
ラックと呼ぶ０）を有する記録担体を使用し、記録担体
上に記録されている信号を再生するあるいは記録担体上
に信号を記録する為の変換手段の走査位置が常にトラッ
ク上を走査するように制御して信号を再生するあるいは
記録するトラッキング制御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 a recording and reproducing apparatus for reproducing signals recorded on a record carrier or for recording signals on a record carrier, and particularly relates to a recording and reproducing apparatus for reproducing signals recorded on a record carrier or for recording signals on a record carrier. Tracks or tracking tracks (pre-installed for recording signals)
Hereinafter, a record carrier having a number of tracks including a signal trunk and a tracking track is used, and a method for reproducing a signal recorded on the record carrier or recording a signal on the record carrier is used. The present invention relates to a tracking control device that reproduces or records a signal by controlling the scanning position of a converting means so that it always scans on a track.
従来例の構成とその問題点
この種の装置として磁気式記録再生装置、光磁気式記録
再生装置、光学式記録再生装置、光学式再生装置あるい
は容量式再生装置等があるが、光学式記録再生装置を例
として従来例を説明する。Conventional configurations and their problems This type of device includes magnetic recording and reproducing devices, magneto-optical recording and reproducing devices, optical recording and reproducing devices, optical reproducing devices, and capacitive reproducing devices. A conventional example will be explained using a device as an example.
例えば光学式記録装置として、半導体レーザ等の光源よ
り発生した光ビームを収束レンズにより微小なビーム径
に収束させて、回転している円盤状の記録担体に照射さ
せ、記録時には光ビームの光量を記録する信号に応じて
変化させて記録し、再生時には光ビームの光量を弱い一
定の光量にして記録担体からの反射光あるいは透過光を
検出して信号を再生するものがある。For example, in an optical recording device, a light beam generated from a light source such as a semiconductor laser is converged into a small beam diameter using a converging lens, and the beam is irradiated onto a rotating disc-shaped record carrier. Some types record by changing the amount of light depending on the signal to be recorded, and when reproducing, the light intensity of the light beam is made weak and constant, and the reflected light or transmitted light from the record carrier is detected to reproduce the signal.
この種の装置に使用する記録担体は、例えば基材表面に
凹あるいは凸条形状のトラックを予め設け、その表面上
に記録材料層を蒸着等の手段によって形成したものがあ
る。この上うなトラックはスパイラル状あるいは同心円
状になっており、トラックピッチ及びトラック幅が非常
に狭く、例えばピッチが１．６μｍ２幅が０．６μｍ程
度である。Some recording carriers used in this type of apparatus have, for example, tracks in the form of concave or convex stripes provided in advance on the surface of a base material, and a recording material layer formed on the surface by means such as vapor deposition. Moreover, these tracks have a spiral shape or a concentric circle shape, and the track pitch and track width are very narrow, for example, the pitch is about 1.6 μm2 and the width is about 0.6 μm.
従って上述した光学式記録再生装置は、高品質の再生信
号を得る為に、回転している記録担体上に照射されてい
る光ビームが常に一定の微小なビーム径となるように制
御するフォーカス制御手段及び記録担体上に収束されて
いる光ビームが常に正確にトラック上を走査するように
制御するトラッキング制御手段が必要不可欠である。Therefore, in order to obtain high-quality reproduction signals, the optical recording/reproducing device described above uses focus control to control the light beam irradiated onto the rotating record carrier so that it always has a constant minute beam diameter. A tracking control means is essential for controlling the light beam focused on the recording medium and the record carrier so that it always accurately scans the track.
フォーカス制御は、記録担体より反射された光ビームよ
り記録担体上の光ビームの収束状態を検出し、この検出
された信号に応じて収束レンズを記録担体面に対して垂
直な方向に移動させて行なっているが、フォーカス制御
の制御精度は極めて高精度のものが要求され、例えば±
０．６μｍ以下である。Focus control involves detecting the convergence state of the light beam on the record carrier from the light beam reflected from the record carrier, and moving the converging lens in a direction perpendicular to the record carrier surface in accordance with the detected signal. However, the control accuracy of focus control is required to be extremely precise, for example ±
It is 0.6 μm or less.
またトラッキング制御は、記録担体を透過した光ビーム
あるいは記録担体より反射された光ビームより記録担体
上に収束されている光ビームとトラックの位置ずれを検
出し、この検出された信号に応じて収束レンズを記録担
体面内の半径方向に移動させて行なっているが、トラッ
キング制御の制御精度もフォーカス制御同様に極めて高
精度のものが要求され、例えば±０．１μｎＬ以下であ
る。In addition, tracking control detects the positional deviation between the light beam focused on the record carrier and the track from the light beam transmitted through the record carrier or the light beam reflected from the record carrier, and focuses the light beam according to the detected signal. Although this is carried out by moving the lens in the radial direction within the plane of the record carrier, the control accuracy of the tracking control is required to be extremely high, like the focus control, for example, ±0.1 μnL or less.
収束レンズを記録担体面内の半径方向に移動させること
の出来る移動範囲は狭く、せいぜＩｎ ２００μｍ程度
であり、一般的に、トラッキング制御はトラックの偏心
に対して光ビームが追随するように収束レンズを移動さ
せ、収束レンズの移動が平均的に零となるようにすなわ
ち自然の状態を中心に移動するように光源を含む光学系
全体を記録担体の半径方向に移動させる移動制御が行な
われている。The movement range in which the converging lens can be moved in the radial direction in the plane of the record carrier is narrow, at most about 200 μm, and tracking control is generally performed so that the light beam follows the eccentricity of the track. Movement control is performed to move the entire optical system including the light source in the radial direction of the record carrier so that the lens is moved and the movement of the converging lens is zero on average, that is, it moves around its natural state. There is.
以上光学式記録再生装置について説明したが、このよう
な装置は極めて高い精度の制御が必要であり、従って装
置全体に加わる外部の振動あるいは衝撃に対して非常に
弱い。Although the optical recording/reproducing device has been described above, such a device requires extremely high precision control and is therefore extremely vulnerable to external vibrations or shocks applied to the entire device.
例えば外部の振動の加速度を９．８ ｔｒｂ／ｓｅｃ
２とすると、１０Ｈｚの正弦波の場合には装置全体が±
２．５鴎も移動することにｋる。従って１０庵で９．８
ｒｎ／ｓｅｃの加速度の外部振動に対して装置が信頼性
よく動作する為には、フォーカス制御系のループゲイン
は１０Ｈｚで７４ｄＢ、トラッキング制御系のループゲ
インは１０）１ｚでｓ ａ ｄＢ少なくとも必要である
。また移送制御の応答性も高速力ものが必要となる〇
しかし、フォーカス制御について言うならば記録担体の
面振れ加速度があり、トラッキング制御について言うな
らばトラックの振心加速度がある。For example, the acceleration of external vibration is 9.8 trb/sec.
2, in the case of a 10Hz sine wave, the entire device will be ±
2.5 The seagulls also decided to move. Therefore, 9.8 in 10 hermitage
In order for the device to operate reliably against external vibrations with an acceleration of rn/sec, the loop gain of the focus control system must be 74 dB at 10 Hz, and the loop gain of the tracking control system must be at least s a dB at 10)1z. be. The responsiveness of the transport control also requires high-speed force.However, for focus control, there is the surface runout acceleration of the record carrier, and for tracking control, there is the eccentric acceleration of the track.
従って上記フォーカス制御系及びトラッキング制御系の
ループゲインはさらに必要である０このように高いルー
プゲインを有する制御系を構成する為には高いＳハの制
御信号の検出と、高い性能の制御素子を必要とし、極め
て困難であり、従来の装置は外部の振動及び衝撃に対し
て極めて弱く、信頼性が低かった。Therefore, the loop gain of the focus control system and the tracking control system described above is required to be higher. In order to construct a control system with such a high loop gain, it is necessary to detect a control signal of high Sc and to use a control element with high performance. The conventional devices are extremely vulnerable to external vibrations and shocks and have low reliability.
発明の目的
本発明の目的は前記従来の欠点を除去し、簡単な構成で
、外部の振動及び衝撃に対して強く、信頼性の高いトラ
ッキング制御装置を提供せんとすることである。OBJECTS OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide a tracking control device that has a simple structure, is resistant to external vibrations and shocks, and is highly reliable.
発明の構成
本発明は記録担体上に信号を記録するあるいは記録担体
上に記録されている信号を再生する為の変換手段と、そ
の変換手段の走査位置を記録担体上のトラック方向に対
して略々垂直な方向に相対的に移動させる為の移動手段
と、記録担体上のトラックと変換手段の走査位置との位
置ずれを検出するトラックずれ検出手段と、トラックず
れ検出手段の信号に応じて移動手段を移動させ変換手段
の走査位置が常に記録担体上のトラック上を走査するよ
うに制御する制御手段と、移動手段の移動方向の装置に
加わる振動あるいは衝撃を検出する為の外乱検出手段と
を有し、外乱検出手段の信号を移動手段に加え、外部か
ら加わる振動あるいは衝撃に対してトラックずれあるい
はトラック飛びが生じないように構成したものである。Structure of the Invention The present invention provides a converting means for recording a signal on a record carrier or reproducing a signal recorded on a record carrier, and a scanning position of the converting means approximately relative to the track direction on the record carrier. a moving means for relative movement in the perpendicular direction; a track deviation detection means for detecting a positional deviation between the track on the record carrier and the scanning position of the conversion means; and a movement according to a signal from the track deviation detection means. A control means for moving the means so that the scanning position of the converting means always scans over a track on the record carrier, and a disturbance detecting means for detecting vibrations or shocks applied to the device in the moving direction of the moving means. The signal from the disturbance detection means is applied to the moving means, and the structure is such that track deviation or track skipping does not occur in response to vibrations or shocks applied from the outside.
実施例の説明
以下図面を参照して本発明の１実施例を詳細に説明する
０尚図面の説明に用いる番号において、同じものについ
ては同一番号を記す。DESCRIPTION OF THE EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.The same reference numerals are used to describe the drawings.
第１図は光学式記録再生装置に本発明を適応した１実施
例である。FIG. 1 shows an embodiment in which the present invention is applied to an optical recording/reproducing device.
記録担体１はディスクモータ２に取シ付けられて所定の
回転数で回転されている。光源３より発生した光ビーム
４は、カップリングレンズ６で平行光にされ、偏光ビー
ムスプリッタ−６、％波長板７を通過し、反射鏡８によ
り反射され、収束レンズ９により収束され、記録担体１
に照射される。The record carrier 1 is attached to a disk motor 2 and is rotated at a predetermined number of rotations. A light beam 4 generated from a light source 3 is made into parallel light by a coupling lens 6, passes through a polarizing beam splitter 6 and a % wave plate 7, is reflected by a reflecting mirror 8, is converged by a converging lens 9, and is directed onto a recording carrier. 1
is irradiated.
記録担体１により反射された光ビーム４は、再び収束レ
ンズ９を通過し、反射鏡８で反射され、％波長板７を通
過し、偏光ビームスプリッタ−６で反射されて凸レンズ
１０に入射される。凸レンズ１０を通過した光ビーム４
は、後に詳述するが分割ミラー１１によって分割されて
、一部の光ビーム４が光検出器１２に照射され、残りの
光ビーム４が反射されて光検出器１３に照射される。収
束レンズ９は２軸方向すなわち記録担体１の面に対して
垂直な方向と記録担体１の半径方向に移動する制御素子
１４の可動部に取り付けられており、制御素子１４によ
って２軸方向に移動できるように構成されている。光源
３．カップリングレンズ５、偏光ビームスプリッタ−６
、％波長板７９反射鏡８．制御素子１４．凸レンズ１０
．分割ミラー１１．光検出器１２及び１３は移送台１６
に取り付けられており、リニアモータ１６によって一体
となって記録担体１の半径方向に移動するように構成さ
れている。The light beam 4 reflected by the record carrier 1 passes through the converging lens 9 again, is reflected by the reflecting mirror 8, passes through the % wave plate 7, is reflected by the polarizing beam splitter 6, and enters the convex lens 10. . Light beam 4 passing through convex lens 10
As will be described in detail later, the light beam 4 is divided by a splitting mirror 11, a part of the light beam 4 is irradiated onto the photodetector 12, and the remaining light beam 4 is reflected and irradiated onto the photodetector 13. The converging lens 9 is attached to a movable part of a control element 14 that moves in two axes, that is, in a direction perpendicular to the surface of the record carrier 1 and in a radial direction of the record carrier 1, and is moved in two axes by the control element 14. It is configured so that it can be done. Light source 3. Coupling lens 5, polarizing beam splitter 6
, % Wave plate 79 Reflector 8. Control element 14. convex lens 10
．． Split mirror 11. The photodetectors 12 and 13 are on the transfer table 16
The record carrier 1 is attached to the record carrier 1 and is configured to move together in the radial direction of the record carrier 1 by a linear motor 16.
収束レンズ１０２分割ミラー１１．光検出器１２及び１
３の構成について第２図と共に説明する。Converging lens 102 divided mirror 11. Photodetector 12 and 1
The configuration of No. 3 will be explained with reference to FIG.
分割ミラー１１は全反射鏡で構成されておシ、分割ミラ
ー１１０反射面は光ビーム４の光軸に対して４５°にな
るように配置されている。分割ミラー１１はその反射面
に収束レンズ９を通過した光ビーム４０半分が照射する
ように配置されておシ、分割ミラー１１で反射された半
分の光ビーム４は光検出器１３に照射され、残りの半分
の光ビーム４は光検出器１２に照射される。さらに説明
すると分割ミラー１１は光ビーム４の光軸に対して垂直
な面内におけるトラック方向と垂直な方向に光ビーム４
を２分割し、半分の光ビーム４を光検出器１３に照射さ
せ、残りの半分の光ビーム４を光検出器１２に照射させ
る。The split mirror 11 is composed of a total reflection mirror, and the reflecting surface of the split mirror 110 is arranged at an angle of 45° with respect to the optical axis of the light beam 4. The splitting mirror 11 is arranged so that half of the light beam 40 that has passed through the converging lens 9 is irradiated onto its reflecting surface, and the half of the light beam 4 reflected by the splitting mirror 11 is irradiated onto the photodetector 13. The remaining half of the light beam 4 is irradiated onto the photodetector 12 . To explain further, the splitting mirror 11 directs the light beam 4 in a direction perpendicular to the track direction in a plane perpendicular to the optical axis of the light beam 4.
is divided into two, one half of the light beam 4 is irradiated onto the photodetector 13, and the other half of the light beam 4 is irradiated onto the photodetector 12.
光検出器１２及び１３は２分割構造になっておシ、２つ
の受光領域を有する。光検出器１２はその分割線の方向
が光検出器１２の受光面におけるトランク方向になるよ
うに配置されており、光検出器１３はその分割線の方向
が光検出器１２の受光面におけるトラック方向と垂直な
方向になるように配置されている。光検出器１２の２つ
の受光領域の信号の差が記録担体１上の光ビーム４とト
ラックの位置ずれを表わす信号となり、光検出器１３の
２つの受光領域の信号の差が記録担体１上の光ビーム４
の収束状態を表わす信号となることは既知であり、詳述
するのを避ける。The photodetectors 12 and 13 have a two-part structure and have two light receiving areas. The photodetector 12 is arranged so that the direction of the dividing line is in the trunk direction on the light receiving surface of the photodetector 12, and the photodetector 13 is arranged so that the direction of the dividing line is in the trunk direction on the light receiving surface of the photodetector 12. It is placed perpendicular to the direction. The difference between the signals of the two light-receiving areas of the photodetector 12 becomes a signal representing the positional deviation between the light beam 4 and the track on the record carrier 1, and the difference of the signals of the two light-receiving areas of the photodetector 13 becomes a signal representing the positional deviation between the light beam 4 and the track on the record carrier 1. light beam 4
Since it is known that the signal represents the convergence state of
第１図において、光検出器１２の２つの出力は、差動増
幅器１７にそれぞれ入力されており、差動増幅器１７は
両信号の差に応じた信号を出力する。In FIG. 1, two outputs of the photodetector 12 are respectively input to a differential amplifier 17, and the differential amplifier 17 outputs a signal according to the difference between the two signals.
上述したように、差動増幅器１７の信号は記録担体１上
の光ビーム４とトラックの位置ずれを表わす信号すなわ
ちトラッキング制御信号となる。差動増幅器１７の信号
は、トラッキング制御系の位相を補償する為の位相補償
回路１８２合成回路１９及び電力増幅する為の駆動回路
２ｏを介して制御素子１４のトラッキング端子に加えら
れている。As described above, the signal from the differential amplifier 17 becomes a signal representing the positional deviation between the light beam 4 and the track on the record carrier 1, that is, a tracking control signal. The signal from the differential amplifier 17 is applied to the tracking terminal of the control element 14 via a phase compensation circuit 182 for compensating the phase of the tracking control system, a synthesis circuit 19, and a drive circuit 2o for power amplification.
従って制御素子１４は差動増幅器１７の信号に応じて収
束レンズ９を記録担体１の半径方向に移動させ、記録担
体１上の光ビーム４が常にトラック上を走査するように
する。また差動増幅器１７の信号は位相補償回路２１２
合成回路２２．電力増幅する為の駆動回路２３を介して
リニアモータ１６に加えられており、リニアモータ１６
は制御素子１４の記録担体１の半径方向の移動が平均的
に零となるように移送台１５を移動させる。（以下、こ
の制御を移送制御と呼ぶ。）位相補償回路２１は移送制
御系の位相を補償する為のものである。The control element 14 therefore moves the converging lens 9 in the radial direction of the record carrier 1 in response to the signal from the differential amplifier 17 so that the light beam 4 on the record carrier 1 always scans over the track. Further, the signal of the differential amplifier 17 is transmitted to the phase compensation circuit 212.
Synthesis circuit 22. It is applied to the linear motor 16 via a drive circuit 23 for power amplification, and the linear motor 16
The transfer table 15 is moved so that the movement of the control element 14 in the radial direction of the record carrier 1 becomes zero on average. (Hereinafter, this control will be referred to as transfer control.) The phase compensation circuit 21 is for compensating the phase of the transfer control system.
２４は圧力センサー等の加速度検出器であり、ディスク
モータ２等を支えている装置のフレーム２６に取り付け
られている。加速度検出器２４は記録担体１の半径方向
すなわち制御素子１４が差動増幅器１７の信号に応じて
移動する方向の外部より加えられた加速度を検出し、こ
の検出した信号を合成回路１９及び２２に送る。合成回
路１９は位相補償回路１８の信号と加速度検出器２４の
信号を合成した信号を出力し、合成回路２２は位相補償
回路２１の信号と加速度検出器２４の信号を合成した信
号を出力する。従って制御素子１４及びリニアモータ１
６は加速度検出器２４の信号に応じて駆動される。Reference numeral 24 denotes an acceleration detector such as a pressure sensor, which is attached to a frame 26 of the device that supports the disk motor 2 and the like. The acceleration detector 24 detects acceleration applied from the outside in the radial direction of the record carrier 1, that is, in the direction in which the control element 14 moves in accordance with the signal from the differential amplifier 17, and sends this detected signal to the combining circuits 19 and 22. send. The combining circuit 19 outputs a signal obtained by combining the signal of the phase compensation circuit 18 and the signal of the acceleration detector 24, and the combining circuit 22 outputs a signal obtained by combining the signal of the phase compensation circuit 21 and the signal of the acceleration detector 24. Therefore, the control element 14 and the linear motor 1
6 is driven in accordance with the signal from the acceleration detector 24.
記録担体１の半径方向すなわち制御素子１４が差動増幅
器１７の信号に応じて移動する方向に装置全体が外部振
動あるいは衝撃を受けた場合、記録担体１は外部振動あ
るいは衝撃に応じて装置のフレーム２６と一体となって
変動するが、移送台１６を含むリニアモータ１６の可動
部は慣性力を受ける。従って加速度検出器２４で外部か
ら加えられた加速度を検出し、この信号をリニアモータ
１６に加え慣性力を相殺すれば、移送台１６はフレーム
２６と一体となって移動する。外部から振動あるいは衝
撃が加えられて、フレーム２６と移送台１５が一体とな
って移動すると、収束レンズ９を含む制御素子１４の可
動部は同様に慣性力を受ける。従って加速度検出器２４
の信号を制御素子１４のトラッキング端子に加え慣性力
を相殺すれば、収束レンズ９はフレーム２５と一体とな
って移動する。If the entire device is subjected to external vibrations or shocks in the radial direction of the record carrier 1, ie in the direction in which the control element 14 moves in accordance with the signal of the differential amplifier 17, the record carrier 1 will be affected by the frame of the device in response to the external vibrations or shocks. Although the movable portion of the linear motor 16 including the transfer table 16 is moved together with the transfer table 16, the movable portion of the linear motor 16 is subjected to an inertial force. Therefore, if the acceleration detector 24 detects the acceleration applied from the outside and applies this signal to the linear motor 16 to cancel out the inertial force, the transfer table 16 moves together with the frame 26. When the frame 26 and the transfer table 15 move together due to external vibration or shock, the movable portion of the control element 14 including the converging lens 9 similarly receives inertial force. Therefore, the acceleration detector 24
When the signal is applied to the tracking terminal of the control element 14 to cancel the inertial force, the converging lens 9 moves together with the frame 25.
以上説明したように、加速度検出器２４の信号を制御素
子１４のトラッキング端子及びリニアモータ１６に加え
慣性力を相殺すれば、収束レンズ９及び移送台１６はフ
レーム２６と一体となって移動し、外部振動あるいは衝
撃が加えられてもトラックずれあるいはトラック飛びは
生じない。As explained above, if the signal from the acceleration detector 24 is applied to the tracking terminal of the control element 14 and the linear motor 16 to cancel out the inertial force, the converging lens 9 and the transfer table 16 move together with the frame 26, Even if external vibrations or shocks are applied, no track deviation or track skipping will occur.
第１図のフォーカス制御について以下説明する。The focus control shown in FIG. 1 will be explained below.
光検出器１３０２つの出力は差動増幅器２６にそれぞれ
入力されており、差動増幅器２６は両信号の差に応じた
信号を出力する。前述したように差動増幅器２６の信号
は記録担体１上の光ビーム４の収束状態を表わす信号す
なわちフォーカスずれ信号となる。差動増幅器２６の信
号は、フォーカス制御系の位相を補償する為の位相補償
回路２７゜合成回路２８及び電力増幅する為の駆動回路
２９を介して制御素子１４のフォーカス端子に加えられ
ている。従って制御素子１４は、差動増幅器２６Φ信号
に応じて収束レンズ９を記録担体１の面と垂直な方向に
移動させ、記録担体１上の光ビーム４の収束状態が常に
一定となるようにする。The two outputs of the photodetector 130 are respectively input to the differential amplifier 26, and the differential amplifier 26 outputs a signal according to the difference between the two signals. As described above, the signal from the differential amplifier 26 becomes a signal representing the convergence state of the light beam 4 on the record carrier 1, that is, a defocus signal. The signal from the differential amplifier 26 is applied to the focus terminal of the control element 14 via a phase compensation circuit 27 for compensating the phase of the focus control system, a synthesis circuit 28, and a drive circuit 29 for power amplification. Therefore, the control element 14 moves the converging lens 9 in a direction perpendicular to the surface of the record carrier 1 in accordance with the differential amplifier 26Φ signal, so that the convergence state of the light beam 4 on the record carrier 1 is always constant. .
３０は圧力センサー等の加速度検出器であシ、フレーム
２６に取シ付けられている。加速度検出器３０は記録担
体１の面と垂直な方向の外部より加えられた加速度を検
出し、この検出した信号を合成回路２８に送る。合成回
路２８は位相補償回路２７の信号と加速度検出器３０の
信号を合成した信号を出力する。従って制御素子１４は
加速度検出器３０の信号に応じて記録担体１の面と垂直
な方向に駆動される。Reference numeral 30 denotes an acceleration detector such as a pressure sensor, which is attached to the frame 26. The acceleration detector 30 detects acceleration applied from the outside in a direction perpendicular to the surface of the record carrier 1, and sends this detected signal to the synthesis circuit 28. The combining circuit 28 outputs a signal obtained by combining the signal from the phase compensation circuit 27 and the signal from the acceleration detector 30. The control element 14 is therefore driven in a direction perpendicular to the plane of the record carrier 1 in accordance with the signal from the acceleration detector 30 .
記録担体１の面と垂直な方向に装置全体が外部振動ある
いは衝撃を受けた場合、記録担体１はフレーム２６と一
体となって変動するが、収束レンズ９を含む制御素子１
４の可動部は慣性力を受ける。従って加速度検出器３ｏ
で外部から加えられた加速度を検出し、この信号を制御
素子１４のフォーカス端子に加え慣性力を相殺すれば、
収束レンズ９はフレーム２６と一体となって移動し、外
部振動あるいは衝撃が加えられてもフォーカスすれは生
じない。When the entire apparatus is subjected to external vibration or shock in a direction perpendicular to the plane of the record carrier 1, the record carrier 1 moves together with the frame 26, but the control element 1 including the converging lens 9
The movable part 4 receives inertia force. Therefore, acceleration detector 3o
If the acceleration applied from the outside is detected and this signal is applied to the focus terminal of the control element 14 to cancel the inertial force,
The converging lens 9 moves together with the frame 26, and no out-of-focus occurs even if external vibrations or shocks are applied.
発明の効果
以上のように、本発明によれば制御信号のＳハ及び制御
素子の特性を上げることなく、外部振動あるいは衝撃に
対して強い制御系を簡単に構成できるので装置の信頼性
を著しく向上させかつ装置を安価にすることができ、そ
の効果は極めて大きい。Effects of the Invention As described above, according to the present invention, a control system that is resistant to external vibrations or shocks can be easily constructed without increasing the control signal S or the characteristics of the control elements, thereby significantly improving the reliability of the device. It is possible to improve the performance and reduce the cost of the device, and the effect is extremely large.
第１図は本発明を光学式記録再生装置に適応した１実施
例のブロック図、第２図はトラッキング制御信号及びフ
ォーカス制御信号の検出を説明する図である。
１・・・・・・記録担体、２・・・・・・ディスクモー
タ、３・・・・・・光源、４・・・・・・光ビーム、９
・・・・・・収束レンズ、１１・・・・・・分割ミラー
、１２．１３・・・・・・光検出器、１７．２６・・・
・・・差動増幅器、１８，２１．２７・・・・・・位相
補償回路、１９，２２．２８・・・・・・合成回路、２
０．２３．２９・・・・・・駆動回路、１４・・・・・
・制御素子、１６・・・・・・移送台、１ｅＳ・・・・
・・リニアモータ、ｉｔ ２４．３０・・・・・・加速
度検出器、２６・・・・・・フレーム。FIG. 1 is a block diagram of an embodiment in which the present invention is applied to an optical recording/reproducing device, and FIG. 2 is a diagram illustrating detection of a tracking control signal and a focus control signal. DESCRIPTION OF SYMBOLS 1... Record carrier, 2... Disc motor, 3... Light source, 4... Light beam, 9
...... Converging lens, 11... Division mirror, 12.13... Photodetector, 17.26...
...Differential amplifier, 18,21.27...Phase compensation circuit, 19,22.28...Synthesizing circuit, 2
0.23.29...Drive circuit, 14...
・Control element, 16...Transfer table, 1eS...
...Linear motor, it 24.30...Acceleration detector, 26...Frame.
Claims (3)
上に記録されている信号を再生する為の変換手段と、前
記変換手段の走査位置を記録担体上のトラック方向に対
して略々垂直な方向に相対的に移動させる移動手段と、
前記記録担体上のトラックと前記変換手段の走査位置と
の位置ずれを検出するトラックずれ検出手段と、前記ト
ラックずれ検出手段の信号に応じて前記移動手段を移動
させ前記変換手段の走査位置が常に前記記録担体上のト
ラック上を走査するように制御まる制御手段と、前記移
動手段の移動方向の装置に加わる振動あるいは衝撃の加
速度を検出する外乱検出手段とを有し、前記外乱検出手
段や信号を前記移動手段に加えるように構成したことを
特徴としたトラッキング制御装置。(1) Conversion means for recording a signal on a record carrier or reproducing a signal recorded on a record carrier, and a scanning position of the conversion means approximately perpendicular to the track direction on the record carrier. a means of moving relatively in a direction;
track deviation detecting means for detecting a positional deviation between a track on the record carrier and a scanning position of the converting means; It has a control means for controlling scanning on a track on the record carrier, and a disturbance detection means for detecting the acceleration of vibration or impact applied to the device in the moving direction of the moving means, and the disturbance detection means and the signal A tracking control device characterized in that the tracking control device is configured to add to the moving means.
に記録されている信号を再生する為の変換手段と、前記
変換手段の走査位置を記録担体上のトラック方向に対し
て略々垂直な方向に相対的に移動させる第１の移動手段
と、前記変換手段の走査位置を記録担体上のトラック方
向に対して略々垂直な方向に前記第１の移動手段も含め
て相対的に移動させる第２の移動手段と、前記記録担体
上のトラックと前記変換手段の走査位置との位置ずれを
検出するトラックずれ検出手段と、前記トラックずれ検
°出手段の信号に応じて前記第１の移動手段を移動させ
前記変換手段の走査位置が常に記録担体上のトラック上
を走査するように制御する第１の制御手段と、前記第１
の制御手段が動作している時、前記第１の移動手段が自
然の状態を中心に移動するように前記第２の移動手段を
移動させて制御する第２の制御手段と、前記第２の移動
手段の移動方向の装置に加わる振動あるいは衝撃の加速
度を検出する外乱検出手段とを有し、前記外乱検出手段
の信号を前記第２の移動手段に加えるように構成したこ
とを特徴としたドラッギング制御装置。(2) A converting means for recording a signal on a record carrier or reproducing a signal recorded on a record carrier, and a scanning position of the converting means is set to be approximately perpendicular to the track direction on the record carrier. a first moving means for relatively moving in a direction; and a scanning position of the converting means, including the first moving means, for relatively moving in a direction substantially perpendicular to the track direction on the record carrier. a second moving means; a track deviation detecting means for detecting a positional deviation between a track on the record carrier and a scanning position of the converting means; a first control means for moving the means so that the scanning position of the converting means always scans over a track on the record carrier;
a second control means for moving and controlling the second moving means so that the first moving means moves around its natural state when the second moving means is in operation; and a disturbance detection means for detecting acceleration of vibration or impact applied to the device in the moving direction of the moving means, and configured to apply a signal from the disturbance detecting means to the second moving means. Control device.
ように構成したことを特徴とする特許請求の範囲第２項
記載のトラッキング制御装置。(3) The tracking control device according to claim 2, characterized in that the signal from the disturbance detection means is applied to the first moving means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58228730A JPH0743900B2 (en) | 1983-12-02 | 1983-12-02 | Tracking controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58228730A JPH0743900B2 (en) | 1983-12-02 | 1983-12-02 | Tracking controller |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13213792A Division JPH0690799B2 (en) | 1992-05-25 | 1992-05-25 | Tracking controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60121578A true JPS60121578A (en) | 1985-06-29 |
| JPH0743900B2 JPH0743900B2 (en) | 1995-05-15 |
Family
ID=16880908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58228730A Expired - Lifetime JPH0743900B2 (en) | 1983-12-02 | 1983-12-02 | Tracking controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0743900B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0217460A1 (en) * | 1985-09-27 | 1987-04-08 | Koninklijke Philips Electronics N.V. | Apparatus for reading information from a record carrier |
| EP0264535A2 (en) * | 1986-10-24 | 1988-04-27 | Hewlett-Packard Company | Shock and vibration disturbance compensation system for disc drives |
| JPS63225974A (en) * | 1986-12-15 | 1988-09-20 | Matsushita Graphic Commun Syst Inc | Suppressing method for vibration |
| JPS6443881A (en) * | 1987-08-11 | 1989-02-16 | Fujitsu Ltd | Magnetic disk device |
| JPH0273534A (en) * | 1988-09-09 | 1990-03-13 | Alpine Electron Inc | Method for controlling servo of optical disk player |
| US4967293A (en) * | 1987-08-11 | 1990-10-30 | Fujitsu Limited | Multi-positioner magnetic disk storage apparatus having means for reducing mechanical vibration interference between positioners |
| US5521772A (en) * | 1993-11-30 | 1996-05-28 | International Business Machines Corporation | Disk drive with accerleration rate sensing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59229773A (en) * | 1983-06-10 | 1984-12-24 | Pioneer Electronic Corp | Record information reader |
| JPS6025377A (en) * | 1983-07-22 | 1985-02-08 | Fujitsu Ltd | Cover letter transmission system |
-
1983
- 1983-12-02 JP JP58228730A patent/JPH0743900B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59229773A (en) * | 1983-06-10 | 1984-12-24 | Pioneer Electronic Corp | Record information reader |
| JPS6025377A (en) * | 1983-07-22 | 1985-02-08 | Fujitsu Ltd | Cover letter transmission system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0217460A1 (en) * | 1985-09-27 | 1987-04-08 | Koninklijke Philips Electronics N.V. | Apparatus for reading information from a record carrier |
| EP0264535A2 (en) * | 1986-10-24 | 1988-04-27 | Hewlett-Packard Company | Shock and vibration disturbance compensation system for disc drives |
| EP0264535A3 (en) * | 1986-10-24 | 1990-09-05 | Hewlett-Packard Company | Shock and vibration disturbance compensation system for disc drives |
| JPS63225974A (en) * | 1986-12-15 | 1988-09-20 | Matsushita Graphic Commun Syst Inc | Suppressing method for vibration |
| JPS6443881A (en) * | 1987-08-11 | 1989-02-16 | Fujitsu Ltd | Magnetic disk device |
| US4967293A (en) * | 1987-08-11 | 1990-10-30 | Fujitsu Limited | Multi-positioner magnetic disk storage apparatus having means for reducing mechanical vibration interference between positioners |
| JPH0273534A (en) * | 1988-09-09 | 1990-03-13 | Alpine Electron Inc | Method for controlling servo of optical disk player |
| JPH0654544B2 (en) * | 1988-09-09 | 1994-07-20 | アルパイン株式会社 | Servo control method for optical disc player |
| US5521772A (en) * | 1993-11-30 | 1996-05-28 | International Business Machines Corporation | Disk drive with accerleration rate sensing |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0743900B2 (en) | 1995-05-15 |
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