JPH0677328B2 - Tracking servo mechanism of optical disc device - Google Patents
Tracking servo mechanism of optical disc deviceInfo
- Publication number
- JPH0677328B2 JPH0677328B2 JP58184149A JP18414983A JPH0677328B2 JP H0677328 B2 JPH0677328 B2 JP H0677328B2 JP 58184149 A JP58184149 A JP 58184149A JP 18414983 A JP18414983 A JP 18414983A JP H0677328 B2 JPH0677328 B2 JP H0677328B2
- Authority
- JP
- Japan
- Prior art keywords
- detector
- tracking servo
- output
- lens
- head
- 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.)
- Expired - Lifetime
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
- G11B7/08—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
- G11B7/095—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 discs, e.g. for compensation of eccentricity or wobble
- G11B7/0953—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 discs, e.g. for compensation of eccentricity or wobble to compensate for eccentricity of the disc or disc tracks
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】 （ａ）発明の技術分野 本発明は光デイスク装置あるいは光磁気デイスク装置等
の光学的デイスク装置における制御回路に係り、特に集
光レンズを駆動する第１のトラツキングサーボ手段と、
その駆動装置を含む光学ヘツド全体を駆動する第２のト
ラツキングサーボ手段の二重制御を行うトラツキングサ
ーボ機構に関する。Description: (a) Technical Field of the Invention The present invention relates to a control circuit in an optical disk device such as an optical disk device or a magneto-optical disk device, and more particularly to a first tracking servo for driving a condenser lens. Means and
The present invention relates to a tracking servo mechanism for performing dual control of second tracking servo means for driving the entire optical head including the drive device.
（ｂ）従来技術と問題点 従来例を図に沿って説明する。なお、構成、動作の説明
を理解し易くするために全図を通して同一部分には同一
符号を付してその重複説明を省略する。(B) Conventional Technology and Problems A conventional example will be described with reference to the drawings. In addition, in order to facilitate understanding of the description of the configuration and the operation, the same reference numerals are given to the same portions throughout the drawings, and the duplicated description thereof will be omitted.
第１図は光学的デイスク装置のトラツキングサーボ機構
の第一の従来構成を示す。図に示す如くこのサーボ機構
は、スピンドルモータ１、このスピンドルモータ１によ
って回転する記録媒体２、光源（図示せず）や集光レン
ズ６等の情報の記録，再生を行うための光学系を収めベ
アリング等にて支持された光学ヘツド３、そのヘツド全
体を記録媒体２の半径方向に移動させるためのボイスコ
イルモータ等からなる駆動装置（以下ヘツドVCMと略称
する）４から構成されている。FIG. 1 shows a first conventional structure of a tracking servo mechanism of an optical disk device. As shown in the figure, the servo mechanism includes a spindle motor 1, a recording medium 2 rotated by the spindle motor 1, an optical system for recording and reproducing information such as a light source (not shown) and a condenser lens 6. An optical head 3 supported by bearings and the like, and a drive device (hereinafter abbreviated as head VCM) 4 including a voice coil motor for moving the entire head in the radial direction of the recording medium 2 are configured.
一方通常の光学的デイスク装置では、記録媒体２の円板
面上に同心円もしくはスパイラル状に形成される情報ト
ラツクは1.5〜３μｍピツチであるのに対し、記録媒体
２には100μｍ程度の偏心が存在する。しかして情報ト
ラツクと集光レンズ６によって記録媒体２の円板面上に
形成される微小光スポツトとの相対的位置ずれ量を検出
し、これを零とすべくフイードバツク制御をかける必要
がある。この位置ずれ量は光学ヘツド３の内部において
検出することができる。しかし単にこの出力をヘツドVC
M4にフイードバツクするのでは現段階においては帯域的
に十分な特性が得られない。そのため通常光学ヘツド３
内部において、例えば第１図に示すように集光レンズ６
を弾性体７により支持し、その集光レンズ６をボイスコ
イルモータ等にて駆動する第１の駆動装置（以下レンズ
VCMと略称する）５により狭い範囲（例えば1mm以下）で
はあるが高帯域に光スポツトを移動できるようになって
おり、図示しない位置ずれ量検出器の出力はこのレンズ
VCM5にフイードバツクされる。以上説明したレンズVCM5
により集光レンズ６と弾性体７を制御するのが第１のト
ラツキングサーボ手段である。On the other hand, in an ordinary optical disk device, the information track formed on the disk surface of the recording medium 2 in a concentric circle or spiral has a pitch of 1.5 to 3 μm, whereas the recording medium 2 has an eccentricity of about 100 μm. To do. Therefore, it is necessary to detect the relative positional deviation amount between the information track and the minute optical spot formed on the disk surface of the recording medium 2 by the condenser lens 6, and to perform the feedback control so as to make it zero. This positional shift amount can be detected inside the optical head 3. However, this output is simply
Feeding back to M4 does not provide sufficient bandwidth characteristics at this stage. Therefore, the normal optical head 3
Inside, for example, as shown in FIG.
Is supported by an elastic body 7, and the condensing lens 6 is driven by a voice coil motor or the like (hereinafter referred to as lens).
The optical spot can be moved to a high band though it is in a narrow range (for example, 1 mm or less) by the VCM 5.
Feed back to VCM5. Lens VCM5 described above
The first tracking servo means controls the condenser lens 6 and the elastic body 7 by means of.
したがつてヘツドVCM4は静止していても偏心追従は可能
であるが、この場合制御性能を現状以上には向上しづら
い上にヘツドVCM4は別個の手段により固定しなければな
らず、かつレンズVCM5がその可動範囲の限界近くにきた
場合にはヘツドVCM4を制御してその位置を固定し直すよ
うな制御回路をもつ必要があり、制御系が複雑になる欠
点があった。Therefore, the head VCM4 can follow the eccentricity even when it is stationary, but in this case it is difficult to improve the control performance more than the current situation, and the head VCM4 must be fixed by a separate means, and the lens VCM5 However, when it comes close to the limit of its movable range, it is necessary to have a control circuit to control the head VCM4 and fix its position again, which has a drawback that the control system becomes complicated.
第２図は光学的デイスク装置のトラツキングサーボ機構
の第二の従来構成図を示す。FIG. 2 shows a second conventional structural view of the tracking servo mechanism of the optical disk device.
図において、８は第１の検出器（トラツクずれ量検出回
路）であって例えば二分割光検出器と差動増幅器の組み
合わせで構成されている。トラツクずれ量検出回路８の
出力により光スポツトと目標トラツクの相対的位置ずれ
量Δx1を検出する。この位置ずれ量検出手段としてはプ
リグルーブ法とかビーム法等各種のものがすでに考案さ
れている。10は第２の検出器（レンズ位置検出器）であ
って、レンズを支えた弾性体７の平衡位置からのレンズ
変位量Δx2を検出する。この検出手段としては光学的な
リニヤエンコーダの原理を利用したものや、弾性体７に
ストレインメータを貼るなどにより容易に実施し得る。
そしてトラツクずれ量検出回路８の出力を位相補償回路
９を介してレンズVCM5にフイードバツクする。またレン
ズ位置検出器10の出力は同じく位相補償回路11を介して
ヘツドVCM4にフイードバツクする。In the figure, reference numeral 8 is a first detector (track shift amount detection circuit), which is composed of, for example, a combination of a two-divided photodetector and a differential amplifier. The relative displacement amount Δx 1 between the optical spot and the target track is detected by the output of the track displacement amount detection circuit 8. Various means such as a pre-groove method and a beam method have already been devised as means for detecting the amount of positional deviation. A second detector (lens position detector) 10 detects the lens displacement amount Δx 2 from the equilibrium position of the elastic body 7 supporting the lens. The detection means can be easily implemented by using the principle of an optical linear encoder or by attaching a strain meter to the elastic body 7.
Then, the output of the track shift amount detection circuit 8 is fed back to the lens VCM5 via the phase compensation circuit 9. The output of the lens position detector 10 is also fed back to the head VCM4 via the phase compensation circuit 11.
すなわち、二重のフイードバツク制御をかける訳である
が、レンズVCM5の可動部質量mLとヘツドVCM4の可動部質
量mHが通常mH＞＞mLの関係にあるので二つのフイードバ
ツクグループの各制御帯域を所要量離しておくだけで二
つの制御系は安定に動作を行う。このようにすれば偏心
のうち低域成分はヘツドVCM4が追従し、ヘツドVCM4が追
従しきれない高域成分のみレンズVCM5が追従することに
なる。通常高域成分の偏心は小振幅であるからレンズVC
M5の可動範囲は狭くても構わない。またレンズVCM5の可
動範囲はヘツドVCM4の可動範囲に拡大されたのと同一で
あるから、レンズVCM5の可動範囲を考慮する必要がなく
光学的デイスク装置のランダムアクセスの際も極めて都
合がよい。That is, a double but mean that applying a fed back control, two full Eid-back groups since the movable part mass m H of the movable part mass m L and head VCM4 lens VCM5 is the relationship of the normal m H >> m L The two control systems operate in a stable manner simply by keeping the required control bands apart from each other. In this way, the head VCM4 follows the low frequency component of the eccentricity, and the lens VCM5 follows only the high frequency component that the head VCM4 cannot fully follow. Usually, the eccentricity of the high frequency component has a small amplitude, so the lens VC
The movable range of M5 may be narrow. Further, since the movable range of the lens VCM5 is the same as that expanded to the movable range of the head VCM4, it is not necessary to consider the movable range of the lens VCM5, which is extremely convenient for random access of the optical disk device.
以上の説明は、第１のトラツキングサーボ手段に重ねる
第２のトラツキングサーボ手段と二つの制御系の安定手
段であるが、更に第２のトラツキングサーボ手段として
以下に述べる第三の従来例がある。The above description is for the second tracking servo means to be superimposed on the first tracking servo means and the stabilizing means for the two control systems, but a third conventional example described below as the second tracking servo means. There is.
第３図は光学的デイスク装置のトラツキングサーボ機構
の第三の従来構成図を示したもので、第二の従来構成図
をより簡素化したものである。すなわち、第２図に示す
レンズ位置検出器10を用いる代わりにレンズVCM5に印加
される駆動信号から所要の低域成分だけを抽出する低域
濾波器10′を位相補償回路９の出力側から分岐して位相
補償回路11の入力側との間に挿入したものである。集光
レンズ６を弾性体７にて支持する形式のばね支持型VCM
では、その変位／電流特性はそのばね定数と可動部質量
によって定まる固有周波数をもつ二次系となるので、演
算増幅器を用いる回路により簡単に低域濾波器10′を実
現可能である。このトラツキングサーボ機構によれば、
精度は悪くなるが構成は簡単で調整は容易となる利点が
ある。FIG. 3 shows a third conventional configuration diagram of the tracking servo mechanism of the optical disk device, which is a simplified version of the second conventional configuration diagram. That is, instead of using the lens position detector 10 shown in FIG. 2, a low-pass filter 10 'for extracting only required low-pass components from the drive signal applied to the lens VCM5 is branched from the output side of the phase compensation circuit 9. And is inserted between the phase compensation circuit 11 and the input side. A spring-supported VCM in which the condenser lens 6 is supported by an elastic body 7.
Then, since the displacement / current characteristic is a secondary system having a natural frequency determined by the spring constant and the mass of the movable part, the low-pass filter 10 'can be easily realized by a circuit using an operational amplifier. According to this tracking servo mechanism,
Although the accuracy is poor, the structure is simple and the adjustment is easy.
ところで、前述したように質量mH＞＞mLなる場合、レン
ズVCM5に印加される力がヘツドVCM4の可動部質量mHに与
える影響は無視できるが、ヘツドVCM4の発生する力によ
りレンズVCM5の可動部質量mLが受ける力の加速度は無視
できない。例えば電車の床上に立っている人間が電車の
動き始めで力の反作用を受けて倒れる現象と同じであ
る。そして第一〜第三の従来構成例ではこの影響により
二重のサーボをかけても総合的な低域一巡伝達ゲインは
レンズVCM5側のサーボループ単体の場合と変わらなくな
ってしまう欠点がある。By the way, as described above, when the mass m H >> m L , the influence of the force applied to the lens VCM5 on the moving part mass m H of the head VCM4 can be ignored, but the force generated by the head VCM4 causes the lens VCM5 to move. The acceleration of the force applied to the moving part mass m L cannot be ignored. For example, it is the same phenomenon that a person standing on the floor of a train falls down due to the reaction of force at the beginning of the train movement. In the first to third conventional configuration examples, due to this influence, the total low-frequency open loop transmission gain remains the same as that of the single servo loop on the lens VCM5 side even when double servo is applied.
（ｃ）発明の目的 二重のトラツキングサーボ手段を用いる場合に総合的に
より高い偏心追従性能が得られる光学的デイスク装置の
トラツキングサーボ機構の提供を目的とする。(C) Object of the invention It is an object of the present invention to provide a tracking servo mechanism of an optical disk device which can obtain a higher overall eccentricity tracking performance when a double tracking servo means is used.
（ｄ）発明の構成 そしてこの目的は本発明によれば、第４図に示すよう
に、円板上の記録媒体２に光学的に情報の記録再生を行
い、前記記録媒体に形成された情報トラツクに前記記録
再生のための微小光スポツトを追従させるために、前記
情報トラツクと微小光スポツトとの相対的位置ずれ量を
検出する第１の検出器８と、前記位置ずれ量を零とする
ように前記微小光スポツトを制御するレンズVCM5とを有
する第１のトラツキングサーボ手段と、当該第１のトラ
ツキングサーボ手段の系に重ねて前記レンズVCM5を含む
光学ヘツド部全部を駆動するヘツドVCM4と前記レンズVC
M5の可動部の基準位置からの位置ずれ量を検出する第２
の検出器10とを備え、前記第２の検出器10の出力を零と
すべく前記ヘツドVCM4にフイードバツクする第２のトラ
ツキングサーボ手段とを備えた光学的デイスク装置にお
いて、前記ヘツドVCM4の発生する力に比例した出力を発
生する第３の検出器12を設けると共に、当該第３の検出
器12の出力と前記第１の検出器８の出力とを加算する加
算器13を設け、当該加算器13の出力を前記レンズVCM5に
フイードバツクするように構成する。(D) Structure of the Invention According to the present invention, as shown in FIG. 4, information is optically recorded / reproduced on / from a recording medium 2 on a disk, and the information formed on the recording medium is recorded. In order to make the minute optical spot for recording and reproducing follow the track, the first detector 8 for detecting the relative positional deviation amount between the information track and the minute optical spot, and the positional deviation amount are set to zero. As described above, the first tracking servo means having the lens VCM5 for controlling the minute optical spot and the head VCM4 for driving the entire optical head portion including the lens VCM5 in the system of the first tracking servo means. And the lens VC
The second to detect the amount of displacement of the movable part of M5 from the reference position
Of the head VCM4 and a second tracking servo means for feeding back to the head VCM4 so that the output of the second detector 10 becomes zero. The third detector 12 that generates an output proportional to the force is added, and the adder 13 that adds the output of the third detector 12 and the output of the first detector 8 is provided. The output of the device 13 is configured to feed back to the lens VCM5.
（ｅ）発明の実施例 以下本発明の実施例を図面によって詳述する。第４図は
本発明の光学的デイスク装置のトラツキングサーボ機構
の構成図を示し、第５図は第４図の機構の周波数／ゲイ
ン特性曲線、すなわち帯域特性の一例を示す。より大き
な偏心に追従可能とするためには、その低域における一
巡伝達ゲインを高くすればよく、全体の一巡伝達ゲイン
がその低域において二つのサーボループの個々の一巡伝
達ゲインの積となれば理想的である。(E) Embodiments of the Invention Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 4 shows a configuration diagram of a tracking servo mechanism of the optical disk device of the present invention, and FIG. 5 shows an example of a frequency / gain characteristic curve of the mechanism of FIG. 4, that is, a band characteristic. In order to be able to follow a larger eccentricity, it is sufficient to increase the loop transfer gain in the low range, and if the entire loop transfer gain is the product of the individual loop transfer gains of the two servo loops in the low band. Ideal.
両図において、12は第３の検出器であってヘツドVCM4の
発生する力に比例した出力を発生する機能を有する。In both figures, 12 is a third detector having a function of generating an output proportional to the force generated by the head VCM4.
特に図示するようなベアリング等に支持されたヘツドVC
M4ではその発生する力FLは、そのヘツドVCM4の駆動電流
iLに比例するから駆動電流iLを検出すればよい。Head VC supported by bearings etc.
In M4 force F L to the generated drive current for the head VCM4
Since it is proportional to i L , the drive current i L may be detected.
13は加算器であって、第３の検出器12の出力と第１の検
出器８の出力とを加算するように接続されている。この
加算器13の出力によってレンズVCM5を駆動する結果、レ
ンズVCM5の可動部はヘツドVCM4の発生する力に比例した
加速度が加算される。すなわち、ヘツドVCM4から受ける
加速度を相殺するように作用するから、前述の電車の床
上の人間は反作用が打ち消されて倒れることはない。An adder 13 is connected so as to add the output of the third detector 12 and the output of the first detector 8. As a result of driving the lens VCM5 by the output of the adder 13, an acceleration proportional to the force generated by the head VCM4 is added to the movable portion of the lens VCM5. That is, since it acts so as to cancel the acceleration received from the head VCM4, the human on the floor of the train does not fall because the reaction is canceled.
したがって、その総合的な低域一巡ゲインは第５図に示
すヘツドVCM4の特性曲線Ｌと、レンズVCM5の特性曲線Ｈ
および総合曲線Ｈ＋Ｌのように二つのサーボループの単
体の一巡ゲインの積となるので高いゲインが得られ、そ
の偏心追従性は向上する。Therefore, the total low-frequency loop gain is the characteristic curve L of the head VCM4 and the characteristic curve H of the lens VCM5 shown in FIG.
Also, as shown by the total curve H + L, the product of the single loop gains of the two servo loops results in a high gain, and the eccentricity followability is improved.
この場合、二つのフイードバツクグループの各制御帯域
を所要量例えば８倍程度離しておくだけで二つの制御系
は安定に動作を行う。その根拠は一巡伝達函数のベクト
ル線図から解明可能である。In this case, the two control systems operate stably only by separating the respective control bands of the two feedback back groups by a required amount, for example, about 8 times. The basis for this can be clarified from the vector diagram of the loop transfer function.
（ｆ）発明の効果 本発明の光学的デイスク装置のトラツキングサーボ機構
によれば、見掛け上レンズVCMの可動範囲をヘツドVCMの
ストロークに拡大できたことと同一効果となるため、光
学ヘッドの制御が容易となるばかりでなく、従来よりも
高い追従精度が容易に実現できる効果がある。(F) Effects of the Invention According to the tracking servo mechanism of the optical disk device of the present invention, the same effect can be obtained in that the movable range of the lens VCM is apparently expanded to the stroke of the head VCM. Not only is it easier to perform, but also higher follow-up accuracy than before can be easily achieved.
第１図は光学的デイスク装置のトラツキングサーボ機構
の第一の従来構成図、第２図は光学的デイスク装置のト
ラツキングサーボ機構の第二の従来構成図、第３図は光
学的デイスク装置のトラツキングサーボ機構の第三の従
来構成図、第４図は本発明の光学的デイスク装置のトラ
ツキングサーボ機構の構成図、第５図は第４図の機構の
周波数／ゲイン特性曲線を示す。 図において、２は記録媒体、４は第２の駆動装置（ヘツ
ドVCM）、５は第１の駆動装置（レンズVCM）、８は第１
の検出器、10は第２の検出器、12は第３の検出器、13は
加算器、ＬはヘツドVCMの帯域特性曲線、ＨはレンズVCM
の帯域特性曲線、Ｈ＋Ｌは総合帯域特性曲線を示す。FIG. 1 is a first conventional configuration diagram of a tracking servo mechanism of an optical disc device, FIG. 2 is a second conventional configuration diagram of a tracking servo mechanism of an optical disc device, and FIG. 3 is an optical disc device. FIG. 4 shows the configuration of the tracking servo mechanism of the optical disk device of the present invention, and FIG. 5 shows the frequency / gain characteristic curve of the mechanism shown in FIG. . In the figure, 2 is a recording medium, 4 is a second drive device (head VCM), 5 is a first drive device (lens VCM), and 8 is a first drive device.
Detector, 10 is the second detector, 12 is the third detector, 13 is the adder, L is the band characteristic curve of the head VCM, and H is the lens VCM.
, And H + L are total band characteristic curves.
Claims (1)
再生を行い、前記記録媒体に形成された情報トラツクに
前記記録再生のための微小光スポツトを追従させるため
に、前記情報トラツクと微小光スポツトとの相対的位置
ずれ量を検出する第１の検出器８と、前記位置ずれ量を
零とするように前記微小光スポツトを制御する第１の駆
動装置５とを有する第１のトラツキングサーボ手段と、
当該第１のトラツキングサーボ手段の系に重ねて前記第
１の駆動装置５を含む光学ヘツド部全部を駆動する第２
の駆動装置４と前記第１の駆動装置５の可動部の基準位
置からの位置ずれ量を検出する第２の検出器10とを備
え、前記第２の検出器10の出力を零とすべく前記第２の
駆動装置４にフイードバツクする第２のトラツキングサ
ーボ手段とを備えた光学的デイスク装置において、 前記第２の駆動装置４の発生する力に比例した出力を発
生する第３の検出器12を設けると共に、当該第３の検出
器12の出力と前記第１の検出器８の出力とを加算する加
算器13を設け、当該加算器13の出力を前記第１の駆動装
置５にフイードバツクするように構成したことを特徴と
する光学的デイスク装置のトラツキングサーボ機構。1. Information is recorded / reproduced optically on a recording medium 2 on a disk, and the information is recorded in order to make a minute optical spot for the recording / reproduction follow an information track formed on the recording medium. A first detector 8 for detecting a relative positional deviation amount between the track and the minute optical spot, and a first driving device 5 for controlling the minute optical spot so that the positional deviation amount becomes zero. 1 tracking servo means,
A second driving means for driving the entire optical head section including the first driving device 5 so as to be superposed on the system of the first tracking servo means.
Drive device 4 and a second detector 10 for detecting the amount of displacement of the movable part of the first drive device 5 from the reference position, and the output of the second detector 10 should be zero. An optical disc device comprising a second tracking servo means for feeding back to the second drive device 4, the third detector generating an output proportional to the force generated by the second drive device 4. 12 is provided, and an adder 13 for adding the output of the third detector 12 and the output of the first detector 8 is provided, and the output of the adder 13 is fed back to the first drive device 5 as feedback feedback. A tracking servo mechanism for an optical disk device, which is configured as described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58184149A JPH0677328B2 (en) | 1983-09-30 | 1983-09-30 | Tracking servo mechanism of optical disc device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58184149A JPH0677328B2 (en) | 1983-09-30 | 1983-09-30 | Tracking servo mechanism of optical disc device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6076037A JPS6076037A (en) | 1985-04-30 |
| JPH0677328B2 true JPH0677328B2 (en) | 1994-09-28 |
Family
ID=16148220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58184149A Expired - Lifetime JPH0677328B2 (en) | 1983-09-30 | 1983-09-30 | Tracking servo mechanism of optical disc device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0677328B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01116926A (en) * | 1987-10-29 | 1989-05-09 | Csk Corp | Writing device for optical memory card |
| US7016141B2 (en) | 2003-10-22 | 2006-03-21 | Seagate Technology Llc | Settle, rotational/linear vibration, and track follow controller optimization with shared state controller |
-
1983
- 1983-09-30 JP JP58184149A patent/JPH0677328B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| PROCEEDINGS OPTICAL DATA STORAGE SPIE * |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6076037A (en) | 1985-04-30 |
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