JPS58182139A - Objective lens driving device - Google Patents

Objective lens driving device

Info

Publication number
JPS58182139A
JPS58182139A JP6434082A JP6434082A JPS58182139A JP S58182139 A JPS58182139 A JP S58182139A JP 6434082 A JP6434082 A JP 6434082A JP 6434082 A JP6434082 A JP 6434082A JP S58182139 A JPS58182139 A JP S58182139A
Authority
JP
Japan
Prior art keywords
coils
objective lens
holding member
coil
yokes
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
Application number
JP6434082A
Other languages
Japanese (ja)
Other versions
JPH0140407B2 (en
Inventor
Masayuki Ito
正之 伊藤
Tsuneo Hirose
広瀬 凡夫
Shinichi Tanaka
伸一 田中
Hiroyuki Nakamura
裕行 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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP6434082A priority Critical patent/JPS58182139A/en
Publication of JPS58182139A publication Critical patent/JPS58182139A/en
Publication of JPH0140407B2 publication Critical patent/JPH0140407B2/ja
Granted 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
    • G11B7/09Disposition 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
    • G11B7/0925Electromechanical actuators for lens positioning
    • G11B7/093Electromechanical actuators for lens positioning for focusing and tracking

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To improve efficiency, to constitute a lightweight movable part, and to improve high frequency characteristics, by using common coils for two axes. CONSTITUTION:While magnets 24 and 25 are fixed in the opposite directions to one-side terminals 22a and 23a of yokes 22 and 23, the other-side terminals 22b and 23b of the yokes 22 and 23 are fitted loosely in through-holes 8b and 8b of a holding member 8, and the magnets 24 and 25 face each other with a specific gap where coils 5 and 6 cross each other, thus constituting a magnetic circuit. In this state, the yokes 22 and 23 are fixed to an external case 21 with screws 26 and 27. Consequently, specific currents are flowed through the coils 5 and 6 to drive the holding member 8 in a tracking and a focusing direction.

Description

【発明の詳細な説明】 本発明は、円盤状ディスク形状をなす記録媒体に高密度
なデジタル信号を記録させた情報トラックに光スポット
を投影させて光学的に情報を読みとる方式の再生装置に
おいて、情報トラックの信号に対して光スポットの位置
を正確に補正制御するために、対物レンズの位置をディ
スク面に対して相対的に制御する対物レンズ駆動装置に
関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a reproducing apparatus that optically reads information by projecting a light spot onto an information track on which a high-density digital signal is recorded on a disc-shaped recording medium. The present invention relates to an objective lens driving device that controls the position of an objective lens relative to a disk surface in order to accurately correct and control the position of a light spot with respect to a signal on an information track.

より廊しぐは、たとえばディスクの回転中心に対する情
報トラックの偏心量、すなわちディスクの径方向の相対
的位置ズレを補正するトラッキング制御と、ディスク自
体のソリ、及びディスクの回転運動に併い相対的に発生
するディスク面の振れに対して対物レンズと情報トラン
ク位置との距離を制御するフォーカス制御とを行なうも
のである。
For example, tracking control corrects the amount of eccentricity of the information track with respect to the center of rotation of the disk, that is, the relative positional deviation in the radial direction of the disk, and the warping of the disk itself and the relative positional deviation due to the rotational movement of the disk. Focus control is performed to control the distance between the objective lens and the information trunk position in response to vibrations of the disk surface that occur.

一般にこの種の光方式情報読取り装置は、ビデオ信号を
記録したビデオディスク、及び符号化されたオーディオ
信号を記録したディジタルオーディオディスクに採用さ
れるとともに、その他コンピュータ関係等の高密度情報
記m再生装置に応用されている。
Generally, this type of optical information reading device is used in video discs that record video signals, digital audio discs that record encoded audio signals, and other high-density information recording and reproducing devices such as those related to computers. It is applied to.

これは、符号化されたビデオ信号や音声信号や種々の情
報を、ディスク−Fに情報トラックとして記録しておき
、このディスクを高速に回転させながら、レーザー光線
などの光源より放射された光をディスクトの情報トラッ
クに集束させ、ディスク面よりの反射光を読み取ること
により、記録さ71だ凡の情報を再生するものである。
In this system, encoded video signals, audio signals, and various other information are recorded as information tracks on disk-F, and while this disk is rotated at high speed, light emitted from a light source such as a laser beam is emitted onto the disk. By focusing the light onto the information track of the disk and reading the reflected light from the disk surface, the recorded information 71 is reproduced.

この光方式情報読取り装置は、情報の記録密度をきわめ
て高密度にすることができ、従来のアナログ方式に比べ
て高密度で、高精度で、高性能な記録ができるという特
長を有する。
This optical information reading device can record information at an extremely high density, and has the advantage of being able to record information at a higher density, with higher precision, and with higher performance than conventional analog systems.

反面、情報トラックの幅、及びピッチがきわめ−C小さ
いため、この高密度な情報を忠実に再生するだめには、
読みとりのだめの光スポットの集束径もきわめて小さな
ものにしなければならず、したがってディスクの情報ト
ラックに対して、光スポットをiTE確に追従させるた
めには、対物レンズを1H面に駆動してディスクとの相
対的な位置ズレが生じないように市111111Iシな
ければならないという問題がある。
On the other hand, since the width and pitch of the information track are extremely small, in order to faithfully reproduce this high-density information,
The focal diameter of the optical spot of the reading reservoir must also be made extremely small. Therefore, in order for the iTE to accurately follow the optical spot with respect to the information track of the disk, the objective lens is driven to the 1H plane and the optical spot is aligned with the disk. There is a problem in that the city 111111I must be moved so that relative positional deviation does not occur.

この問題を解決するために従来から、ディスク面からの
反射光を電気的に検出し、読み取り光スポツト位置を情
報トラック位置に合致させるよう制御することが行われ
ている。
In order to solve this problem, conventional methods have been used to electrically detect the reflected light from the disk surface and control the reading light spot position to match the information track position.

その−例として、レーザー光源と対物レンズとの間にあ
る光路に回動可能なミラーを置き、トラッキング誤差信
号の情報をもとにして、このミラーを回動させて制御す
る方法がある。しかしこの方法では対物レンズ内の光軸
に常にある傾斜角が発生し、高精度な再生が望めない欠
点がある。
For example, there is a method in which a rotatable mirror is placed in the optical path between the laser light source and the objective lens, and the mirror is rotated and controlled based on the information of the tracking error signal. However, this method has the drawback that a certain inclination angle always occurs in the optical axis within the objective lens, and highly accurate reproduction cannot be expected.

また、他の列として、対物レンズまたはその保持枠を板
バネよりなる弾性支持部材により支持し、トラッキング
誤差信号に従って対物レンズをディスク面に対して平行
に変位させてトラッキング制御を行ない、さらにこれら
弾性支持部材、対物レンズ、及びトラッキング制御用の
駆動装置を有する装置全体を別の弾性支持部材で支持し
、これをフォーカス制御用の駆動装置(例えばスピーカ
に一般的に用いられているボイスコイルと等価なもの)
を用いてディスク面に垂直な方向に対物レンズを駆動し
、フォーカスを制御する方法が提案されている。ところ
がこの方法は、トラッキング制御とフォーカス制御がそ
れぞれ別個の電磁装置によって行なわれるから、構成が
複雑になり、重量も大きくなって高い周波数での応答が
悪くなるという問題がある。しかも対物レンズにトラッ
キング制御用の弾性部材を設け、この弾性部材を含めて
フォーカス方向に駆動するだめ、前記弾性部材がトラッ
キング方向に傾斜している状態で対物レンズと弾性部材
の弾性作用によってレンズのフォーカス方向・\の移動
に時間的、位相的なずれが生じ、IF確なフォーカス制
−ができないという問題がある。
In addition, as another column, the objective lens or its holding frame is supported by an elastic support member made of a leaf spring, and tracking control is performed by displacing the objective lens parallel to the disk surface according to the tracking error signal. The entire device including a support member, an objective lens, and a drive device for tracking control is supported by another elastic support member, and this is connected to a drive device for focus control (e.g., equivalent to a voice coil commonly used in speakers). thing)
A method has been proposed in which the focus is controlled by driving the objective lens in a direction perpendicular to the disk surface. However, this method has problems in that tracking control and focus control are performed by separate electromagnetic devices, resulting in a complicated configuration, increased weight, and poor response at high frequencies. In addition, the objective lens is provided with an elastic member for tracking control, and the elastic member including this elastic member is driven in the focus direction, so that when the elastic member is tilted in the tracking direction, the elastic action of the objective lens and the elastic member causes the lens to move. There is a problem in that a temporal and phase shift occurs in the movement in the focus direction and \, making it impossible to accurately control the IF focus.

本発明はこれらの欠点を除去し、トラッキング方向及び
、フォーカス方向に対して対物レンズをより1′E確に
制御することができ、いずれの方向に対しても動作の直
線性(リニアリティー)が良く構造が簡単で、かつ軽量
な対物レンズ駆動装置を提供するものである。
The present invention eliminates these drawbacks, enables more precise control of the objective lens in the tracking direction and focus direction, and provides good linearity of operation in both directions. It is an object of the present invention to provide an objective lens driving device that has a simple structure and is lightweight.

以F1本発明の詳細を図面を参照して説明する。Hereinafter, details of the F1 invention will be explained with reference to the drawings.

第1図は本発明の対物レンズを駆動させる駆動力を得る
ための原理を示すものである。一定の空間を置いて同軸
上に配置された2つの永久磁石1と2は、第1図に示す
通り同軸上に互に逆方向に着磁されており、それぞれコ
字状に形成された磁性材ヨーク3,4によりそれぞれ磁
気ギャップを形成している。一方可動部には、一定の角
度を有してコイル5.6が互いにクロスする様に巻装さ
れている。前述した2つの磁気ギャップは、2つのコイ
ル5.6がクロス状態となる部分に対し対称的に配置さ
れている。第2図は駆動力の方向を説明する図である。
FIG. 1 shows the principle for obtaining the driving force for driving the objective lens of the present invention. Two permanent magnets 1 and 2 are coaxially arranged with a certain space between them, and are magnetized in opposite directions on the same axis, as shown in Figure 1, and each has a U-shaped magnetic field. A magnetic gap is formed by the material yokes 3 and 4, respectively. On the other hand, coils 5 and 6 are wound around the movable part so as to cross each other at a certain angle. The two magnetic gaps mentioned above are arranged symmetrically with respect to the area where the two coils 5.6 cross. FIG. 2 is a diagram illustrating the direction of the driving force.

簡単のだめコイルがクロス状態となる一方向のみの説明
をする。今、コイル6とコイル6にある方向の電流を流
した場合、ベクトルa及びbなる方向に力が発生し、そ
の合成力はVとなる。また、コイル6の電流の方向のみ
を逆にした場合にはコイル5によるベクトルCとコイル
6によるベクトルbによりその合成ベクトルはHとなる
。即ち、コイル6とコイル6の電流の方向を制御するこ
とにより垂直方向、及び水平方向の任意な方向に可動部
を動かすことが可能となるのである。
We will explain only one direction in which the simple coil is in a crossed state. Now, when a current is passed in a certain direction through the coils 6 and 6, forces are generated in the directions of vectors a and b, and the resultant force is V. Furthermore, when only the direction of the current in the coil 6 is reversed, the combined vector of the vector C caused by the coil 5 and the vector b caused by the coil 6 becomes H. That is, by controlling the coil 6 and the direction of the current flowing through the coil 6, it is possible to move the movable part in any vertical or horizontal direction.

第3図、第4図は本発明の一実施例を示すもので、トラ
ッキング方向とフォーカス方向の2次元の対物レンズ駆
動装置を示す。
FIGS. 3 and 4 show an embodiment of the present invention, and show a two-dimensional objective lens drive device in the tracking direction and the focus direction.

光信号が通過する対物レンズ7はコイル巻枠を兼ねた保
持部材8の中心穴8aに固定されている。
An objective lens 7 through which an optical signal passes is fixed in a center hole 8a of a holding member 8 which also serves as a coil winding frame.

この保持部材8は、軽量でかつ強固な材料即ち、アルミ
、マグネ7ウム等の軽金属又はカーボンファイバー、ガ
ラス等の強化剤を含んだ強化プラスチック等で形成され
ており、第3図に示すように支持部材との結合用突起部
9,1oを有するものである。この保持部材8の外周部
には対物レンズ7の光軸をつつみ、かつ光軸を避ける部
分に互いに一定角度を有して対称的に2つのコイル6.
6が巻装されている。
The holding member 8 is made of a lightweight and strong material, such as a light metal such as aluminum or magnesium, or a reinforced plastic containing a reinforcing agent such as carbon fiber or glass, as shown in FIG. It has protrusions 9 and 1o for coupling with the support member. On the outer periphery of this holding member 8, two coils 6.
6 is wrapped.

上記結合用突起部9,100先端部には2次元移動規制
用の支持部材11.12が結合される。
Support members 11 and 12 for regulating two-dimensional movement are coupled to the tips of the coupling protrusions 9 and 100.

支持部材11は、一対の弾性面13.14と一対の剛体
面15.16からなる平行四辺形の枠状体と、一対の弾
性面17.18と一対の剛体面15゜19からなる平行
四辺形の枠状体と、を連結したもので構成されている。
The support member 11 includes a parallelogram frame-shaped body consisting of a pair of elastic surfaces 13.14 and a pair of rigid surfaces 15.16, and a parallelogram frame consisting of a pair of elastic surfaces 17.18 and a pair of rigid surfaces 15.19. It is made up of a frame-shaped body connected to each other.

支持部材12も同様に構成されている。すなわち、これ
らの支持部材11゜12は、隣接する弾性面13.17
及び14.18がほぼ90度になるように形成された2
連ばねで構成されている。
The support member 12 is similarly configured. That is, these support members 11, 12 have adjacent elastic surfaces 13, 17
and 2 formed so that 14.18 is approximately 90 degrees
It is composed of a series of springs.

これらの支持部材11.12は、剛体面16゜16を保
持部材8の結合用突起部9,1oに結合し、剛体面19
.19を外ケース21に固着することによって、保持部
材8を外ケース21内に可動自在に支持する。
These support elements 11.12 connect the rigid surfaces 16.16 to the coupling projections 9, 1o of the holding element 8 and the rigid surfaces 19.
.. By fixing the holding member 19 to the outer case 21, the holding member 8 is movably supported within the outer case 21.

磁気回路は、磁性材よりなるコ字状のヨーク22゜23
の一端22a 、23a1第4図に示すように同軸で逆
方向に着磁したマグネット24.25を固着し、かつヨ
ーク22.23の他端22b、23bを保持部材8の貫
通孔9b、8bに遊嵌し、上記マグネット24.25を
コイル5,6のクロスする部分に対し、所定のギャップ
をあけて対向させることによって構成されており、この
状態でヨーク22,23がビス26.27により外ケー
ス21に固着されている。
The magnetic circuit consists of a U-shaped yoke 22゜23 made of magnetic material.
As shown in FIG. 4, one end 22a, 23a1 is fixed with a magnet 24.25 coaxially magnetized in opposite directions, and the other end 22b, 23b of the yoke 22.23 is inserted into the through hole 9b, 8b of the holding member 8. The magnets 24 and 25 are loosely fitted and are made to face the crossing portion of the coils 5 and 6 with a predetermined gap therebetween. In this state, the yokes 22 and 23 are removed by screws 26 and 27. It is fixed to the case 21.

このようにすれば、コイル6.6に所定の電流を流すこ
とにより、第2図に示した動作原理によって保持部材8
がトラッキング方向、フォーカス力向に駆動される9、
このとき支持部材11.12は各f行四辺形を構成する
剛体面15,16.19が、保持部材8、外ケース21
に対して垂直度を保り)つ、弾性面13,14,17.
18の弾性作用VCより第3図に示すトラッキングT方
向及びフォーカス方向に動くことになる。このため共通
の支持部材11.12を用いて保持部材8をトラッキン
グTとフォーカスFの2軸方向に動かすことができ、し
かもその移動時に対物レンズ7の光軸が傾くこともない
In this way, by passing a predetermined current through the coil 6.6, the holding member 8 is
is driven in the tracking direction and focus force direction9,
At this time, the supporting members 11, 12 have rigid surfaces 15, 16, 19 constituting each f-row quadrilateral, the holding member 8, the outer case 21,
the elastic surfaces 13, 14, 17.
Due to the elastic action VC of 18, it moves in the tracking T direction and focus direction shown in FIG. Therefore, the holding member 8 can be moved in the two axial directions of tracking T and focusing F using the common support members 11 and 12, and the optical axis of the objective lens 7 is not tilted during the movement.

L記支持部材11.12は、ポリイミド、ポリプロピレ
ン等の高弾性を有する合成樹脂で一体成杉し、弾性面1
3,14,17.18を薄肉面で、剛体面16.19を
厚肉面で構成することができる1、もちろん、弾性面1
3,14,17.18と剛体面16.19を別々の材料
で構成し、これを接着剤で結合したり、あるいは成形金
型内部でインサート、アウトサート等の方法で一体化し
てもよい。
The L support members 11 and 12 are made of cedar made of synthetic resin with high elasticity such as polyimide and polypropylene, and have an elastic surface 1.
3, 14, 17.18 can be made up of thin walls, and the rigid surface 16.19 can be made up of thick walls 1. Of course, the elastic surface 1
3, 14, 17.18 and the rigid surface 16.19 may be made of different materials, and these may be bonded with an adhesive, or may be integrated by inserting, outsert, etc. inside the molding die.

また、第3図、第4図の実施例では平行四辺形の枠状体
を2個連結したもので構成したが、3個以上連結したも
ので構成してもよい。
Furthermore, although the embodiments shown in FIGS. 3 and 4 are constructed by connecting two parallelogram frame bodies, it may be constructed by connecting three or more parallelogram frame bodies.

さらに、第3図、第4図の実施例では装置全体を小型化
するために支持部材11.12を平行に配置したが、こ
れらの支持部材11.12を第4図のo−o’@上に同
軸状に配置し、各支持部材11゜12の剛体面16.1
6で保持部材8を挾持するようにしてもよい。
Furthermore, in the embodiments shown in FIGS. 3 and 4, the support members 11.12 are arranged in parallel in order to miniaturize the entire device, but these support members 11.12 are arranged in the o-o'@ The rigid surface 16.1 of each support member 11°12 is arranged coaxially on the
The holding member 8 may be held between the holding members 6 and 6.

第5図、第6図は上記実施例によるトラッキング方向お
よびフォーカス方向の伝達特性を示すものである。
FIG. 5 and FIG. 6 show the transfer characteristics in the tracking direction and focus direction according to the above embodiment.

以上のように本発明は、保持部材に巻装した2個のコイ
ルに流れる電流と、上記2個のコイルに対向して配置さ
れたマグネットの磁力との電磁作用により、各コイルに
それぞれ駆動力を発生し、これらの駆動力の合成駆動力
により保持部材を少なくとも2軸方向に駆動するように
したものである1、このようにすれば保持部材に巻かれ
たコイルにより保持部材を直接駆動することができるか
ら、保持部材に取付けた対物レンズの位相特性を著しく
優れたものにすることができる。また2軸に共通の磁気
ギヤノブを使用するため、各軸方向のアンバランスもな
く、いずれの周波数特性も安定で優tLだものになる。
As described above, the present invention provides a driving force to each coil by the electromagnetic action of the current flowing through the two coils wound around the holding member and the magnetic force of the magnet placed opposite the two coils. The holding member is driven in at least two axial directions by the combined driving force of these driving forces.1 In this way, the holding member is directly driven by the coil wound around the holding member. Therefore, the phase characteristics of the objective lens attached to the holding member can be made extremely excellent. Furthermore, since a common magnetic gear knob is used for the two axes, there is no imbalance in each axis direction, and both frequency characteristics are stable and have excellent tL.

また、2軸に対して共通のコイルを1吏用するため、効
率も高く、軽量な可動部が構成でき、したがって高周波
特性も優れたものになる。
Furthermore, since one common coil is used for the two axes, a highly efficient and lightweight movable part can be constructed, and the high frequency characteristics are also excellent.

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

第1図、第2図は本発明の原理を示す分解、f+視図及
び動作説明図、第3図、第4図は本発明の一実施例の要
耶滅断斜祝図お↓び分解斜視図、第5図、第6図は上記
実施例p伝達特性図である。 5.6・・コイル、7・・・・・対物レンズ、8・・・
・保持部材、9,1o・・・結合用突起部、11.12
・・支持部材、13,14,17.18−・・弾性面、
16,15.19・・・・・剛体面、21 ・・・外ケ
ース、22.23・・・ヨーク、24.25・・・・マ
グネット。 代理人の氏名 弁理士 中 尾 敏 男 ほか1名第1
図 第3図 第41!I 7 ドクツキング方間 第6図 フォーカス方向 笥凌Jl tH値)
Figures 1 and 2 are exploded, f+ view and operation explanatory diagrams showing the principle of the present invention. Figures 3 and 4 are exploded perspective views of one embodiment of the present invention. The perspective view, FIG. 5, and FIG. 6 are transfer characteristic diagrams of the above embodiment P. 5.6...Coil, 7...Objective lens, 8...
・Holding member, 9, 1o... coupling projection, 11.12
...Supporting member, 13, 14, 17.18-...Elastic surface,
16, 15.19... Rigid surface, 21... Outer case, 22.23... Yoke, 24.25... Magnet. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 41! I 7 Dotsking direction Figure 6 Focusing direction

Claims (1)

【特許請求の範囲】[Claims] 円盤状記録媒体に設けられた符゛号化された情報トヘク
に対向して移動自在に配置された保持部材と、この保持
部材に取付けられた対物レンズと、に記保持部材に所定
の角度をもってクロスするように巻装された2個のコイ
ルと、上記2個のコイルのクロスする部分と対向する位
置に所定のギャップをあけて配置されたマグネットとを
備え、上dピマグネノトの磁力と上記各コイルに流れる
電流との電磁作用により上記各コイルにそれぞれ駆動力
を発生し、ト記各コイルに発生する駆動力を合成した合
成駆動力によりト記保持部材を少なくとも2軸方向に駆
動するようにしたことを特徴とする対物レンズ駆動装置
a holding member movably disposed facing the encoded information storage provided on the disc-shaped recording medium; an objective lens attached to the holding member; It is equipped with two coils wound so as to cross each other, and a magnet placed with a predetermined gap at a position facing the crossing portion of the two coils, and the magnetic force of the upper d magneto and each of the above. A driving force is generated in each of the coils through electromagnetic interaction with the current flowing through the coil, and the holding member is driven in at least two axial directions by a combined driving force obtained by combining the driving forces generated in each of the coils. An objective lens driving device characterized by:
JP6434082A 1982-04-16 1982-04-16 Objective lens driving device Granted JPS58182139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6434082A JPS58182139A (en) 1982-04-16 1982-04-16 Objective lens driving device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6434082A JPS58182139A (en) 1982-04-16 1982-04-16 Objective lens driving device

Publications (2)

Publication Number Publication Date
JPS58182139A true JPS58182139A (en) 1983-10-25
JPH0140407B2 JPH0140407B2 (en) 1989-08-29

Family

ID=13255410

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6434082A Granted JPS58182139A (en) 1982-04-16 1982-04-16 Objective lens driving device

Country Status (1)

Country Link
JP (1) JPS58182139A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4587466A (en) * 1982-12-09 1986-05-06 Magnetic Peripherals Two axis linear motor for optical focusing and tracking system in optical recording
US4616355A (en) * 1983-09-26 1986-10-07 Kabushiki Kaisha Toshiba Optical head device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819743A (en) * 1981-07-24 1983-02-04 Pioneer Video Corp Optical system driver for recorded information reader

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819743A (en) * 1981-07-24 1983-02-04 Pioneer Video Corp Optical system driver for recorded information reader

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4587466A (en) * 1982-12-09 1986-05-06 Magnetic Peripherals Two axis linear motor for optical focusing and tracking system in optical recording
US4616355A (en) * 1983-09-26 1986-10-07 Kabushiki Kaisha Toshiba Optical head device

Also Published As

Publication number Publication date
JPH0140407B2 (en) 1989-08-29

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