JPS6089839A - Device for setting neutral position in focus direction of objective lens driver in optical information recording and reproducing device - Google Patents
Device for setting neutral position in focus direction of objective lens driver in optical information recording and reproducing deviceInfo
- Publication number
- JPS6089839A JPS6089839A JP19876483A JP19876483A JPS6089839A JP S6089839 A JPS6089839 A JP S6089839A JP 19876483 A JP19876483 A JP 19876483A JP 19876483 A JP19876483 A JP 19876483A JP S6089839 A JPS6089839 A JP S6089839A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- neutral position
- rotating body
- focus direction
- information recording
- 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
- 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
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0933—Details of stationary parts
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、ビデオ、オーディオ等に広く用いられつつあ
る光学的記録ディスクに対し情報の記録を行ない、ある
いは記録された情報の読取を行なう際にレーザ光をディ
スク上に収束させる対物レンズの駆動装置に係り、特に
そのフォーカス方向の中立位置の設定装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for recording information on optical recording disks that are becoming widely used for video, audio, etc., or for reading recorded information by directing a laser beam onto the disk. The present invention relates to a driving device for a converging objective lens, and particularly to a device for setting a neutral position in a focusing direction.
この種の光学的情報記録再生装置は、読取な例にとると
、光学的記録ディスクに対物レンズで収束された情報読
取レーザ光を照射し、その反射光から」１記ディスクに
記録されている情報を読み出すものであり、対物レンズ
はディスクのトランク方向（半径方向）に移動するスラ
イダに搭載されている。そして対物レンズは、情報を正
確に読み出す、ため、このスライダ上において、焦点調
節のための光軸方向（フォーカス方向）の移動と、トラ
ック方向、つまりディスクの略半径方向の微調整が可能
でなければならない。第１図ないし第６図はこの機能を
持った従来の対物レンズ駆動装置を示すものである。For example, this type of optical information recording/reproducing device irradiates an optical recording disk with an information reading laser beam focused by an objective lens, and uses the reflected light to record data on the disk. It reads out information, and the objective lens is mounted on a slider that moves in the trunk direction (radial direction) of the disk. In order for the objective lens to read out information accurately, the slider must be able to move in the optical axis direction (focus direction) for focus adjustment and to make fine adjustments in the track direction, that is, in the approximately radial direction of the disk. Must be. FIGS. 1 to 6 show conventional objective lens driving devices having this function.
第１図ないし第６図において、ｌは回転軸１ａを中心に
回転駆動される光学的記録ディスクで、このディスクｌ
の半径方向に向け−Ｃ設けたガイドレール２にスライダ
３が摺動１３丁能に支持されている。スライダ３は一点
を中心に回動可能なアームの先端に固定することもある
。対物レンズ４は、このスライダ３」二に案内軸５を中
心に回動０ｆ能に支持した筒状の回動体６に搭載されて
いる。この対物レンズ４の光軸は案内軸５と平行であり
：間車しないレーザ光源およびビームスプリッタ（偏光
ビームスプリッタと四分の一波長板の組合せ、またはハ
ーフミラ−から構成される）を介して導かれる情報読取
レーザ光をディスクｌ上に収束さゼる。ディスクｌで反
射した反射光は、再び対物レンズ４を通り、ビームスプ
リフタで分割されて受光素子に入り、この受光素子で信
号として読み出される。In FIGS. 1 to 6, l is an optical recording disk that is driven to rotate around a rotation axis 1a, and this disk l
A slider 3 is slidably supported by a guide rail 2 provided in a radial direction of -C. The slider 3 may be fixed to the tip of an arm that is rotatable around one point. The objective lens 4 is mounted on a cylindrical rotating body 6 supported on the slider 3'' so as to be rotatable about a guide shaft 5. The optical axis of this objective lens 4 is parallel to the guide axis 5: it is guided through a continuous laser light source and a beam splitter (consisting of a combination of a polarizing beam splitter and a quarter-wave plate, or a half mirror). The information reading laser beam is focused onto the disk l. The light reflected by the disk l passes through the objective lens 4 again, is split by a beam splitter, enters a light receiving element, and is read out as a signal by this light receiving element.
この情報読取を行なう際の対物レンズ４の焦点調節、お
よびディスクｌの略半径方向のトラック力ｉｆすの微調
整をＯ（能とするため、筒状回動体６には、フォーカス
方向駆動コイル７およびトラック方向駆動コイル８が巻
回固着されている。この両コイル７．８は接着材等を用
いて互いに密着させて回動体６に１４１定したもので、
フォーカス方向駆動コイル７は、案内軸５と同軸に巻か
れている。In order to adjust the focus of the objective lens 4 and finely adjust the tracking force in the approximately radial direction of the disk l when reading this information, the cylindrical rotating body 6 is equipped with a focus direction drive coil 7. and a track direction drive coil 8 are wound and fixed. Both coils 7.8 are fixed to the rotary body 6 at 141 by adhering them to each other using an adhesive or the like.
The focus direction drive coil 7 is wound coaxially with the guide shaft 5.
これに対し、トラック方向駆動コイル８は周方向に４群
に分割されており、各コイル８ａ、８ｂ、８ｃ、８ｄは
１周方自戒分Ｓおよび軸方向成分Ｚを有して角形に連続
的に巻かれている。On the other hand, the track direction drive coil 8 is divided into four groups in the circumferential direction, and each coil 8a, 8b, 8c, and 8d has a self-control component S in one circumference and an axial component Z, and is continuous in a rectangular shape. wrapped around.
他方、スライダ３にはヨーク１０が固定されている。こ
のヨーク１０は、径方向の相対向する一箇所に内周弧状
部１１を有するベース１２と、この内周弧状ｆｉｌｌの
外側に位置する環状の永久磁石１３を有しそおり、永久
磁石１３の内周弧状部１１との対向位置にはキャップ１
４が被若され−ＣいるＪ内周弧状部１１とキャップ１４
部分は他の部分より磁束密度の高い磁力強化区間■を構
成する。上記筒状の回動体６に固定したコイル７．８は
、この内周弧状部１１とキャップ１４間のキャップ１５
内に挿入されるもので、トラック方向駆動コイル８は、
フォーカス方向駆動コイル７へ通電しないとき、隣り合
う該コイル８がこの磁力強化区間■内に対称に位置する
ようにされている。なお１６は回動体６から垂下した回
動範囲規制ピンで、この規制ピン１６の下端が粘弾性材
１８に支持されて対物レンズ４のトラック方向の中１’
／位置が規制されている。すなわち粘弾性材１８は、ヨ
ーク１２の内周弧状部１１に固定した連結Ｕｙｌ ７に
固着したもので、その自由端部が押えリング１９により
上記規制ピン１６のド端に連結されている。On the other hand, a yoke 10 is fixed to the slider 3. The yoke 10 has a base 12 having an inner arcuate portion 11 at one location facing each other in the radial direction, and an annular permanent magnet 13 located outside the inner arcuate fill. A cap 1 is provided at a position facing the circumferential arc portion 11.
4 is rejuvenated - J inner circumferential arcuate portion 11 and cap 14
The part constitutes a magnetic force reinforcement section ■ where the magnetic flux density is higher than other parts. The coil 7.8 fixed to the cylindrical rotating body 6 is connected to the cap 15 between the inner arcuate portion 11 and the cap 14.
The track direction drive coil 8 is inserted into the
When the focus direction drive coil 7 is not energized, the adjacent coils 8 are arranged symmetrically within this magnetic force reinforcement section (2). Reference numeral 16 denotes a rotation range regulating pin that hangs down from the rotating body 6, and the lower end of this regulating pin 16 is supported by a viscoelastic material 18, so that the lower end of the regulating pin 16 is supported by a viscoelastic material 18.
/Location is restricted. In other words, the viscoelastic material 18 is fixed to a coupling Uyl 7 fixed to the inner circumferential arc-shaped portion 11 of the yoke 12, and its free end is coupled to the closed end of the regulating pin 16 by a presser ring 19.
１、記従来装置は、フォーカス方向駆動コイル７に電流
を流すと、ギャップ１５に発生している磁束線と、この
コイル７を流れる電流の向きは直交しているため、回動
体６およびこれに支持されている対物レンズ４は案内軸
５の軸方向、つまり対物レンズ４の光軸方向Ｆに移動す
ることになり、フォーカス方向駆動コイル７に流す電流
の大小で焦点調節を行なうことができる。1. In the conventional device, when a current is passed through the focus direction drive coil 7, the magnetic flux lines generated in the gap 15 and the direction of the current flowing through this coil 7 are perpendicular to each other, so that the rotating body 6 and the current flowing through the coil 7 are The supported objective lens 4 moves in the axial direction of the guide shaft 5, that is, in the optical axis direction F of the objective lens 4, and the focus can be adjusted by changing the magnitude of the current flowing through the focus direction drive coil 7.
また４群に分割されているトラック方向駆動コイル８に
対し、磁力強化区間Ｉ内に位置する軸方向成分２に流れ
る電流の向きが同じになるように電流を流すと、軸方向
成分２に流れる電流と、ギャップ１５に発生している磁
束線とが直交するため、回動体６は案内軸５を中心に回
動することになる。したがって回動体６の偏心位置に搭
載さ −れている対物レンズ４はトラック方向Ｔに駆動
され、トラック方向の微調整がなされる。Furthermore, when a current is applied to the track direction drive coil 8 which is divided into four groups so that the direction of the current flows in the axial component 2 located within the magnetic force reinforcement section I is the same, the current flows in the axial direction component 2. Since the current and the lines of magnetic flux generated in the gap 15 are perpendicular to each other, the rotating body 6 rotates around the guide shaft 5. Therefore, the objective lens 4 mounted at an eccentric position on the rotating body 6 is driven in the track direction T, and fine adjustment in the track direction is performed.
ところでこのような対物レンズ駆動装置では、回動体６
の対物レンズ４がフォーカス方向の上下に移動できるよ
うに、回動体６を浮上状態に維持すること、つまり中立
位置に保持することか必要である。従来装置においては
、フォーカス方向駆動コイル７に適当な大きさの初期電
流（オフセ、。By the way, in such an objective lens driving device, the rotating body 6
It is necessary to maintain the rotating body 6 in a floating state, that is, in a neutral position, so that the objective lens 4 can move up and down in the focusing direction. In the conventional device, an initial current (offset) of an appropriate magnitude is applied to the focus direction drive coil 7.
１・電流）を流して回動体６を中立状態に維持すること
が行なわれているが、このように電気的にオフセットを
ケえるには、複雑な電気回路を必要とする。つまり始動
時にフォーカスサーチ動作を行なう必要があるため、制
御系が複雑となるという問題がある。Although it is common practice to maintain the rotating body 6 in a neutral state by flowing current (1.current), a complicated electrical circuit is required to overcome the electrical offset in this way. That is, since it is necessary to perform a focus search operation at the time of starting, there is a problem that the control system becomes complicated.
本発明は、オフセット電流をｌｊ、えるという電気的な
手段によることなく、磁気的なＬ段により、対物レンズ
を搭載した回動体のフォーカス方向の中立位置を設定す
ることができる装置をＬＩ的になされたもので、対物レ
ンズ駆動装置のフォーカス方向駆動装置自体を、回動体
に固定した永久磁石と、回動体と同心でこの永久磁石の
外側に位置させ−（スライダに（ｉ、１定され、」−記
永久磁石との電磁ｆ＋川により通電吟に」二記回動体を
軸方向に移動さゼるフォーカス方向駆動コイルとから構
成し、さらにこの対物レンズ駆動装置のフォーカス方向
駆動装置において、さらに上記スライダ」二に、ト記水
久磁石の磁束線が通る少なくとも一つの磁性材料からな
る中立位置設定部材を設け、この中立位Ｉ−“′１１定
部材の位置に応じて」−配回動体に作用する軸方向の力
により、回動体のフォーカス方向の中ｓ７位置を設定す
るようにしたことを特徴としている。The present invention is an LI-based device that can set the neutral position of a rotating body equipped with an objective lens in the focus direction using a magnetic L stage without using electrical means such as applying an offset current lj. In this method, the focus direction driving device itself of the objective lens driving device is placed between a permanent magnet fixed to a rotating body, and a position concentric with the rotating body and outside of this permanent magnet. The focus direction driving device of this objective lens driving device further includes: a focus direction drive coil that moves the rotary body in the axial direction; A neutral position setting member made of at least one magnetic material, through which the magnetic flux lines of the Mizuku magnet pass through, is provided on the slider 2, and the neutral position I-'11 is determined according to the position of the constant member'-rotating body. It is characterized in that the middle s7 position of the rotating body in the focusing direction is set by the axial force acting on the rotating body.
以ト図、１＼実施例について本発明を説明するに、まず
この実施例の対物レンズ駆動装置自体の構成を説明する
。この対物レンズ駆動装置のフォーカス方向駆動装置の
構成は本発明の前提となるものである。第７図ないし第
、１０図において、ガイドレール２、対物レンズ４、ス
ライダ３、案内軸５、および光学的記録ディスクｌは従
来装置と同の構成要素であっ℃、本実施例においては案
内＋１１ｂ ５は磁性相料から構成されている。対物レ
ンズ４は案内筒部２１を有する非磁性材料から構成した
円板状の回動体２０の偏心部に固定されており、案内筒
部２１が案内軸５に回動および軸方向移動自在に胚めら
れている。この回動体２０のＦ面には径方向の相対向す
る二筒所に、一対の約四分の−・円弧の永久磁石２２．
２２が垂ド固定されている。この永久磁石２２．２２は
その径方向をＢ （ａ方向としたもので、両者の内外周
部の極性が１１いに同一になっている。すなわち内周部
は例えばともにＳ極、外周部はともにＮ極である。Below, the present invention will be explained with reference to the first embodiment. First, the configuration of the objective lens driving device itself of this embodiment will be explained. The configuration of the focus direction driving device of the objective lens driving device is the premise of the present invention. In FIGS. 7 to 10, the guide rail 2, objective lens 4, slider 3, guide shaft 5, and optical recording disk l are the same components as in the conventional device. 5 is composed of a magnetic phase material. The objective lens 4 is fixed to an eccentric portion of a disk-shaped rotating body 20 made of a non-magnetic material and has a guide tube 21, and the guide tube 21 is rotatably and axially movable around the guide shaft 5. being admired. On the F surface of the rotary body 20, a pair of permanent magnets 22 having a shape of about a quarter arc are placed at two radially opposed positions.
22 is fixed vertically. The radial direction of these permanent magnets 22, 22 is B (a direction), and the polarity of the inner and outer peripheral parts of both are exactly the same. That is, the inner peripheral part is both S pole, and the outer peripheral part is the S pole. Both are N poles.
ステイタ３側に固定された支持台２３は、アルミニウム
合金等の非磁性材料から構成したもので、１−記永久磁
石２２．２２の外側に位置する筒状壁２４を有している
。この支持台２３は、従来例と異なり磁石は有していな
い。そして磁イ」の代わりに、従来例においては回動体
６に固着されていたフォーカス方向駆動コイル７とトラ
ンク方向駆動コイル８が、筒状壁２４の内側に１−□１
着されている。このフォーカス方向駆動コイル７とＩ・
ランり方向駆動」イル８の巻線の方向、永久磁石２２に
対する位置関係等は従来例と同様であり、焦点調整用駆
動コイル７に正逆に電流を流すと、回動体２０が案内軸
５方向に移動して対物レンズ４の焦点調節が行なわれ、
トラック方向駆動コイル８に正逆に電流を流すと、回動
体２０が案内軸５を中心に回動して対物レンズ４のトラ
ック方向の位置調節がなされる。第１θ図は、上記両コ
イル７．８を筒状ｖ１２４に固定する前の状態を示すも
ので、両コイルはボビンレス、または非磁性材料からな
るボビンに巻かれている。The support stand 23 fixed to the stator 3 side is made of a non-magnetic material such as an aluminum alloy, and has a cylindrical wall 24 located outside the permanent magnets 22 and 22. This support stand 23 does not have a magnet, unlike the conventional example. Then, instead of the magnet, a focus direction drive coil 7 and a trunk direction drive coil 8, which were fixed to the rotating body 6 in the conventional example, are installed inside the cylindrical wall 24.
It is worn. This focus direction drive coil 7 and I.
The direction of the winding of the run direction drive coil 8, the positional relationship with respect to the permanent magnet 22, etc. are the same as in the conventional example. The focus of the objective lens 4 is adjusted by moving in the direction,
When current is passed through the track direction driving coil 8 in the forward and reverse directions, the rotating body 20 rotates around the guide shaft 5, and the position of the objective lens 4 in the track direction is adjusted. FIG. 1θ shows the state before the two coils 7.8 are fixed to the cylindrical v124, and both coils are wound on bobbinless or bobbin made of non-magnetic material.
そして本発明は、永久磁石２２を回動体２０に固定した
ことを利用して、：′回動体２０のフォーカス方向の中
立位置、つまりフォーカス方向駆動コイル７に電流を□
流さない状態における回動体２０の位置を設定しようと
するもので、回動体２０の回動中心たる案内軸５の下方
に、案内軸５と同様に磁性材料か□らなる中立位置設定
部材３０を固定している。この中立位置設定部４４３０
は偏平な仮相（円板材または孔穿き円板材）から構成し
たもので、この中立位置設定部材３０の位置に応じて回
動体２０、つまり対物レンズ４のフォーカス方向の中立
位置を設定することができる。すなわち永久磁石２２の
磁束線は、磁性材料である案内軸５と中立位置設定部材
３０を通るため、永久磁石２２つまり回動体２０は、両
磁性材料の位置に応じ永久磁石２２のＮ極から出てＳ極
に入る磁束線が第１１図の上下で均等になるような力を
受ける。このため極めて軽い力で軸方向に移動するよう
に支持された回動体２０つまり対物レンズ４のフォーカ
ス方向の中立位置を、中立位置設定部材３０の案内軸５
の軸方向位置により設定できるのである。第１１図（Ａ
）、（Ｂ）はその原理をさらに詳しく説明するためのも
ので、同図（Ａ）は申立位置設定部材３０がないとき、
磁性材料からなる案内軸５を通る磁束線が安定している
状態を示している。このときには、永久磁石２２を出て
上側にループを描く磁束線Ｕが回動体２０を上へ上げる
力となり、下側にループを描く磁束ｋｌＡＢか回動体２
０を下へ下げる力となる。したがって回動体２０の全体
の重峡をＧとすると、Ｕ＝Ｂ＋Ｇとなるフォーカス方向
位置で、回動体２０が安定することになる。ところが、
これに同図（Ｂ）のように中立位置設定部材３０を設け
ると、中立位置設定部材３０を通る磁束線の影響で、下
側の磁束線Ｂ°が増加し、上側の磁束線Ｕ″が減少する
。このため回動体２０は下側への力を受け、図（”’Ａ
）の状態より下がった位置、つまり上下の磁束１が均
衡する□、Ｕ ’ ＝Ｂ ’ ＋Ｇが成立する位置で安
定する＝ したがって中立位置設定部材３０をＸ方向に
上昇させると、永久磁石２２の上下の磁束線が均等にな
るように回動体２０がＸ方向に下降し、逆に中、立位置
設足部材３０ｔ−Ｙ方向に下降させると回動体２０がＸ
方向に上昇する。このことは、中立位置設定部材３０の
軸方向の位置調節を＋＋（能□とすれば、対物レンズ４
のフォーカス方向の中立位置を自由に設定できることを
意味する。The present invention takes advantage of the fact that the permanent magnet 22 is fixed to the rotating body 20, and applies current to the neutral position of the rotating body 20 in the focus direction, that is, the focus direction drive coil 7.
This is intended to set the position of the rotating body 20 in a state where no flow occurs, and a neutral position setting member 30 made of a magnetic material like the guide shaft 5 is placed below the guide shaft 5 which is the center of rotation of the rotating body 20. Fixed. This neutral position setting section 4430
is composed of a flat temporary structure (a disc material or a perforated disc material), and the neutral position of the rotating body 20, that is, the objective lens 4 in the focus direction can be set according to the position of the neutral position setting member 30. can. In other words, the magnetic flux lines of the permanent magnet 22 pass through the guide shaft 5, which is a magnetic material, and the neutral position setting member 30, so the permanent magnet 22, that is, the rotating body 20, moves out from the N pole of the permanent magnet 22 depending on the position of both magnetic materials. The magnetic flux lines entering the south pole are subjected to a force that makes them equal at the top and bottom of Fig. 11. For this reason, the neutral position in the focus direction of the rotating body 20, that is, the objective lens 4, which is supported so as to move in the axial direction with an extremely light force, can be set by the guide shaft 5 of the neutral position setting member 30.
It can be set by the axial position of Figure 11 (A
) and (B) are for explaining the principle in more detail, and (A) of the same figure shows when the application position setting member 30 is not present,
This shows a state in which the magnetic flux lines passing through the guide shaft 5 made of a magnetic material are stable. At this time, the magnetic flux line U that leaves the permanent magnet 22 and draws a loop upward becomes a force that raises the rotating body 20, and the magnetic flux klAB that draws a loop downward
It becomes the force that lowers 0. Therefore, if the entire gravity of the rotating body 20 is G, the rotating body 20 will be stabilized at a position in the focus direction where U=B+G. However,
When a neutral position setting member 30 is provided as shown in FIG. As a result, the rotating body 20 receives a downward force, causing the rotation body 20 to
), that is, the upper and lower magnetic fluxes 1 are balanced □, and it is stable at the position where U' = B' + G is established = Therefore, when the neutral position setting member 30 is raised in the X direction, the permanent magnet 22 When the rotary body 20 is lowered in the X direction so that the upper and lower magnetic flux lines are equal, and conversely when lowered in the middle and standing position foot member 30t-Y direction, the rotary body 20 is lowered in the X direction.
rise in the direction. This means that if the axial position adjustment of the neutral position setting member 30 is ++ (ability □), then the objective lens 4
This means that the neutral position in the focus direction can be freely set.
中Ｘｒ位置設定部材３０の位置調節手段は問わない。も
っとも申立位置設定部材３０は予め設定した位置に固定
してもよく、この場合にも、フォーカス方向駆動コイル
７にオフセ・ント電流を流しておかなければならない従
来装置に比し、何等＃！ｊ ５ＪＩＩの電気的制御を必
要とせずフォーカス方向の１４＋立位置を設定できると
いう効果が得られる。Any means for adjusting the position of the middle Xr position setting member 30 may be used. However, the application position setting member 30 may be fixed at a preset position, and even in this case, compared to the conventional device in which an offset current must be passed through the focus direction drive coil 7, it is much better! The effect of being able to set the 14+ standing position in the focus direction without requiring electrical control of J5JII can be obtained.
上記実施例では案内軸５と、板状の中立位置３！定部材
３０の両者を磁性材料から構成したが、第１２図（Ａ）
、ＣＢ）のように案内軸５を非磁性材料から構成し、回
動体２０の外周部、例えｉｆ支持台２３の筒状壁２４に
、該回動体２０と同・らの磁性材料からなる筒状材また
は環状材３１をＲ１すても、該筒状材または環状材３１
の位置番と応じ、上記と同様の原理によって、回動体２
０のフォーカス方向の中立位置を設定することができる
。さらに回動体２０の外周に設ける中立位置設定部材は
、環状でない、第１３図（Ａ）、（Ｂ）＆と示すような
単なる磁性材料片３２であっても磁束線の分布を変化さ
せることができるので、同様に【１１立位置の設定を行
なうことができる。第１３１Ａの例の場合、磁性材料片
３２は、永久磁石２２のイ装置に対応させて径方向の二
箇所各こ設けるの力く、軸ノｊ自刃のバランスの上から
好ましい。In the above embodiment, the guide shaft 5 and the plate-shaped neutral position 3! Although both of the fixed members 30 are made of magnetic material, FIG. 12(A)
, CB), the guide shaft 5 is made of a non-magnetic material, and a cylinder made of the same magnetic material as the rotating body 20 is formed on the outer peripheral part of the rotating body 20, for example, on the cylindrical wall 24 of the IF support base 23. Even if the cylindrical material or annular material 31 is R1, the cylindrical material or annular material 31
According to the position number of the rotary body 2, according to the same principle as above,
A neutral position in the focus direction of 0 can be set. Furthermore, even if the neutral position setting member provided on the outer periphery of the rotating body 20 is not annular and is simply a piece of magnetic material 32 as shown in FIGS. Therefore, the [11 standing position settings can be made in the same way. In the case of the 131A example, it is preferable to provide the magnetic material pieces 32 at two locations in the radial direction corresponding to the permanent magnets 22 from the viewpoint of balance of the axial nozzle and self-cutting.
またこれらの中立位置設定部材を構成する磁性材料は、
鉄、鋼、ステンレス等の任意の（強）磁性材料を用いる
ことができる。中立位置設定部材３０の代わりに磁石を
用いても対物レンズ４のフォーカス方向の中立位置を設
定することができるが、磁石では永久磁石２２との磁気
吸引力（または反発力）が強過ぎて、フォーカス方向駆
動コイル７によるフォーカス方向の駆動を゛円滑に行な
うことができない。In addition, the magnetic materials that make up these neutral position setting members are
Any (ferro)magnetic material can be used, such as iron, steel, stainless steel, etc. Although it is possible to set the neutral position of the objective lens 4 in the focus direction by using a magnet instead of the neutral position setting member 30, the magnetic attraction (or repulsion) with the permanent magnet 22 is too strong with a magnet. The drive in the focus direction by the focus direction drive coil 7 cannot be performed smoothly.
なお上記実施例に示したトラック方向駆動装置は一例を
示すもので、本発明はトラック方向の駆動り段およびそ
の中立位との設定手段は問わない。また上記実施例では
、フォーカス方向駆動コイル７および一部の中立位置設
定部材（環状材３１）を支持台２３の環状壁２４に固定
するようにしたが、支持台２３およびその環状壁２４は
必ず、没けねばならない゛というものではなく、シたが
ってフォーラス方向駆動コイルおよび中立位置設定部材
は他の適当な手段によりスライダ３上に設けてもよい。Note that the track direction drive device shown in the above embodiment is merely an example, and the present invention is not limited to the track direction drive stage and the means for setting it to the neutral position. Further, in the above embodiment, the focus direction drive coil 7 and a part of the neutral position setting member (annular member 31) are fixed to the annular wall 24 of the support base 23, but the support base 23 and its annular wall 24 are always However, it is not necessary that the forcible drive coil and the neutral positioning member be fixed on the slider 3 by other suitable means.
以上のように本発明によれば、フォーカス方向駆動コイ
ルをスライダに固定し、対物レンズを搭載した回動体に
永久磁石を固定する構成の対物レンズ駆動装置において
、さらにスライダ上の適当な位置に少なくとも一つの磁
性材料からなる中立位置設定部材を設けるという非常に
単純な構成により、該中立位置設定部材の位置に応じた
対物レンズのフォーカス方向の中立位置を設定すること
ができる。したがってフォーカス方向駆動コイルにオフ
セット電流を流して中立位置を設定していた従来装置に
比し、複雑な電気回路を要することがなく、したがって
電気的な調整が不要であるとともにフォーカス方向の感
度に優れた装置が得られる。特に中立位置設定部材の位
置を調節可能とすれば、対物レンズのフォーカス方向の
申立位置を自由に設定することができる。As described above, according to the present invention, in an objective lens drive device configured to fix a focus direction drive coil to a slider and fix a permanent magnet to a rotating body on which an objective lens is mounted, at least With a very simple configuration in which a neutral position setting member made of a single magnetic material is provided, it is possible to set the neutral position of the objective lens in the focus direction according to the position of the neutral position setting member. Therefore, compared to conventional devices that set the neutral position by passing an offset current through the focus direction drive coil, there is no need for a complicated electrical circuit, therefore there is no need for electrical adjustment, and the sensitivity in the focus direction is excellent. A device is obtained. In particular, if the position of the neutral position setting member is adjustable, the position of the objective lens in the focus direction can be set freely.
第１図は光学的情報記録再生装置のスライダと光学的記
録ディスクの関係を示す平面図、第２図は従来の対物レ
ンズ駆動装置の平面図、第３図は従来装置の支持台部分
の平面図、第４図、第５図はそれぞれｆｉｔ、３図のＩ
Ｖ−ＩＶ線、Ｖ−Ｖ線に沿う断面図、第６図は、従来装
置の筒状回動体の斜視図、第７図は本発明の対物レンズ
駆動装置の実施例を示す平面図、第８図は第７図の■−
■線に沿う断面図、第９図は対物レンズを搭載した本発
明の回動体の斜視図、第１０図は支持台に固定するコイ
ルの斜視図、第１１図（Ａ）、（Ｂ）は磁性材料からな
る二つの中立位置設定部材を通る磁束線の様子と、本発
明の原理を示す磁気回路図、第１２図（Ａ）、（Ｂ）お
よび第１３図（Ａ）。
（Ｂ）はそれぞれ本発明の他の実施例を示す平面図と縦
断面図である。
ｌ・・・光学的記録デ・イスク、３・・・スライダ、４
・・・★４物レンズ、７・・・フォーカス方向駆動コイ
ル、８・・・トラック方向駆動コイル、２ｏ・・・回動
体、２２・・・永久磁石、２３・・・支持台、３ｏ・・
・中立位置設定部材、３１・・・環状材または筒状材、
３２・・・磁性材料片。
特許出願人 旭光学工業株式会社
同代理人 三 浦 邦 夫
″“１ｒ″：！
第３図
第５図 第６図
第９図Fig. 1 is a plan view showing the relationship between the slider and the optical recording disk of an optical information recording/reproducing device, Fig. 2 is a plan view of a conventional objective lens drive device, and Fig. 3 is a plan view of the support portion of the conventional device. Figures 4 and 5 are fit and I in Figure 3, respectively.
6 is a perspective view of the cylindrical rotating body of the conventional device, and FIG. 7 is a plan view showing an embodiment of the objective lens driving device of the present invention. Figure 8 is the ■− of Figure 7.
■A sectional view taken along the line, FIG. 9 is a perspective view of the rotating body of the present invention equipped with an objective lens, FIG. 10 is a perspective view of the coil fixed to the support base, and FIGS. 11 (A) and (B) are 12(A), (B) and FIG. 13(A) are magnetic circuit diagrams showing the state of magnetic flux lines passing through two neutral position setting members made of magnetic materials and the principle of the present invention. (B) is a plan view and a vertical sectional view showing other embodiments of the present invention, respectively. l... Optical recording disc, 3... Slider, 4
...★4-object lens, 7... Focus direction drive coil, 8... Track direction drive coil, 2o... Rotating body, 22... Permanent magnet, 23... Support stand, 3o...
- Neutral position setting member, 31... annular member or cylindrical member,
32...Magnetic material piece. Patent applicant Asahi Optical Co., Ltd. Agent Kunio Miura "1r":! Figure 3 Figure 5 Figure 6 Figure 9
Claims (1)
ライダに、杏内袖を中心に回動可能で電磁的Ｔ段により
軸方向に移動する回動体を支持し、この回動体に１．情
報読出レーザ光を上記ディスク上に収束させる対物レン
ズを搭載した光学的情報記録再生装置において、上記回
動体に永久磁石を固定し、上記ステイグ上に、この回動
体と同心でＪ１記永久磁石との電磁作用により通電時に
上記回動体を軸方向に讐動さ竺るフォーカス方向駆動コ
イルを固定１、さら←上記スライダに、上記永久′ １
′ 磁石の磁束線が通る少なくとも一つの磁性材料からなる
中立位置設定部材を設け、この中立、位置設定部材の位
置に応じて上記回動体に作用する軸方向の力により、」
１記回動体のフォーカス方向の中１“ノー位置を設定す
るようにしたことを特徴とする光学的情報記録再生装置
における対物レンズ駆動装置のフォーカス方向中立位置
設定装置。 （２、特許請求の範囲第１項において、中立位置設定部
材は、回動体の回動中心たる磁性材料からなる案内軸と
、この案内軸の上または下に設けた磁性材料からなる板
材との二つからなっている光学的情報記録再生装置にお
ける対物レンズ駆動襞間のフォーカス方向中立位置設定
装置。 （３）特許請求の範囲第２項において、板材は。 回動体の軸方向に位置１１１１１１ｆ能である光学的情
報記録再生装置における対物レンズ駆動装置のフォーカ
ス方向中立位ａ１設定装置。 （４）特、１１請求の範囲第１イｌにおいて、中立位置
設定部材は、回動体の外周に位置する磁性材料からなる
筒状材または環状材である光学的情報記録再生装置にお
ける対物レンズ駆動装置のフォーカス方向申立位置設定
装置。 （５）特許請求の範囲第４項において、筒状材または環
状材は、回動体の軸方向に位置調節ｕ（能である光学的
情報記録再生装置における対物レンズ駆動装置のフォー
カス方向中立位置設定装置。 （６）特許請求の範囲第１項において、中立位置設定部
材は、回動体の外周部に位置するーまたは複数の磁性材
料片である光学的情報記録再生装置における対物レンズ
駆動装置のフォーカス方向中１′ノ位置設定装置。 （７）特許請求の範囲第６項において、磁性材料片は、
回動体の径方向の三箇所に対称に設けられている光学的
情報記録再生装置における対物レンズ駆動装置のフォー
カス方向中立位置設定装置。 （８）特許請求の範囲第６項また。は第７項において、
磁、性材料片は回動体の軸方向に位置調節可能である光
学的情報記録再生装置における対物レンズ駆動装置のフ
ォーカス方向中立位置設定装置。[Scope of Claims] (1) A rotating body that is rotatable around an inner sleeve and that is movable in the axial direction by an electromagnetic T stage is supported on a slider that moves in the track direction of an optical recording disk. 1. For moving objects. In an optical information recording/reproducing device equipped with an objective lens that converges an information reading laser beam onto the disk, a permanent magnet is fixed to the rotating body, and a J1 permanent magnet is mounted on the stigma concentrically with the rotating body. A focus direction driving coil that moves the rotary body in the axial direction when energized by the electromagnetic action of is fixed 1, and furthermore, the permanent coil 1 is attached to the slider.
' Provide a neutral positioning member made of at least one magnetic material through which the magnetic flux lines of the magnets pass, and by an axial force acting on the rotating body according to the position of this neutral positioning member.
1. A device for setting a neutral position in a focus direction of an objective lens driving device in an optical information recording/reproducing device, characterized in that a 1" NO position is set in the focus direction of a rotating body. (2. Claims In paragraph 1, the neutral position setting member is an optical system consisting of two parts: a guide shaft made of a magnetic material, which is the center of rotation of the rotating body, and a plate made of a magnetic material provided above or below the guide shaft. A device for setting a neutral position in the focus direction between the objective lens drive folds in an information recording and reproducing device. A device for setting a neutral position a1 in a focus direction of an objective lens driving device in an apparatus. or a focusing direction position setting device for an objective lens driving device in an optical information recording/reproducing device which is a ring-shaped member. A device for setting a neutral position in the focus direction of an objective lens drive device in an optical information recording/reproducing device that is a position adjustment u (function). (7) In claim 6, the magnetic material pieces are:
A focusing direction neutral position setting device for an objective lens driving device in an optical information recording/reproducing device, which is provided symmetrically at three locations in the radial direction of a rotating body. (8) Claim 6. In paragraph 7,
A device for setting a neutral position in a focus direction of an objective lens driving device in an optical information recording/reproducing device, in which a piece of magnetic material can be positioned in an axial direction of a rotating body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19876483A JPS6089839A (en) | 1983-10-24 | 1983-10-24 | Device for setting neutral position in focus direction of objective lens driver in optical information recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19876483A JPS6089839A (en) | 1983-10-24 | 1983-10-24 | Device for setting neutral position in focus direction of objective lens driver in optical information recording and reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6089839A true JPS6089839A (en) | 1985-05-20 |
| JPH0435815B2 JPH0435815B2 (en) | 1992-06-12 |
Family
ID=16396551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19876483A Granted JPS6089839A (en) | 1983-10-24 | 1983-10-24 | Device for setting neutral position in focus direction of objective lens driver in optical information recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6089839A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0228227A2 (en) * | 1985-12-17 | 1987-07-08 | Seiko Instruments Inc. | Apparatus for urging an axially movable member to a neutral axial position |
| JPS63209033A (en) * | 1987-02-24 | 1988-08-30 | Mitsubishi Electric Corp | Objective lens driver |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57107131U (en) * | 1980-12-22 | 1982-07-01 |
-
1983
- 1983-10-24 JP JP19876483A patent/JPS6089839A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57107131U (en) * | 1980-12-22 | 1982-07-01 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0228227A2 (en) * | 1985-12-17 | 1987-07-08 | Seiko Instruments Inc. | Apparatus for urging an axially movable member to a neutral axial position |
| JPS63209033A (en) * | 1987-02-24 | 1988-08-30 | Mitsubishi Electric Corp | Objective lens driver |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0435815B2 (en) | 1992-06-12 |
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