JPS6085446A - Object lens driving device of optical information recording and reproducing device - Google Patents
Object lens driving device of optical information recording and reproducing deviceInfo
- Publication number
- JPS6085446A JPS6085446A JP19395783A JP19395783A JPS6085446A JP S6085446 A JPS6085446 A JP S6085446A JP 19395783 A JP19395783 A JP 19395783A JP 19395783 A JP19395783 A JP 19395783A JP S6085446 A JPS6085446 A JP S6085446A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- permanent magnet
- fixed
- outer frame
- tangential direction
- 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
- G11B7/081—Disposition or mounting of heads or light sources relatively to record carriers for time base error correction by moving the light beam
-
- 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
- G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking
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」二に収束させる対物レンズの駆動装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for recording information on optical recording disks, which are becoming widely used for video, audio, etc., or for reading recorded information. The present invention relates to an objective lens driving device for converging an objective lens.
この種の光学的情報記録再生装置は、読取を例にとると
、光学的記録ディスクに対物レンズで収束された情報読
出レーザ光を照射し、その反射光から上記ディスクに記
録されている情報を読み取るものであり、対物レンズは
ディスクのトラック方向（半径方向）に移動するスライ
ダ上に搭載されている。そして対物レンズは、焦点調節
のためのフォーカス方向の位置調節手段を備え、さらに
ｌｐｍオーダの間隔で並ぶ記録ドツトに対し正確なトラ
ッキングを行なわせるため、トラッキング方向およびタ
ンジェンシャル方向（接線方向）への微調整手段を設け
ている。Taking reading as an 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 reads the information recorded on the disk from the reflected light. The objective lens is mounted on a slider that moves in the track direction (radial direction) of the disk. The objective lens is equipped with position adjustment means in the focus direction for focus adjustment, and furthermore, in order to accurately track the recording dots lined up at intervals on the order of lpm, the objective lens is equipped with position adjustment means in the tracking direction and tangential direction. A fine adjustment means is provided.
この直交三方向への微調整の方法は、従来装置において
は、次の三方法が代表的なものとして知られている。そ
の−は、焦点調節はフォーカスモータにより行ない、ト
ラッキング方向、タンジェンシャル方向への微調整は、
対物レンズに対する入射光の方向を変化させて行なうも
のである（斜め入射方式）。しかしこの従来装置は、対
物レンズに対する入射方向の変化を可動ミラーの角度調
節により行なうものであるため、軸合せや部品配置の構
成上、小型化することが困難であり、また対物レンズに
対し斜めに光が入射するため、像性能が劣化し、かつレ
ンズのイメージサークルを大きくとる必要があるので、
対物レンズの製作コストが高くなるという問題がある。The following three methods are known as typical methods for fine adjustment in the three orthogonal directions in conventional devices. - Focus adjustment is performed by a focus motor, and fine adjustments in the tracking direction and tangential direction are
This is done by changing the direction of the incident light on the objective lens (oblique incidence method). However, since this conventional device changes the direction of incidence on the objective lens by adjusting the angle of a movable mirror, it is difficult to miniaturize due to axis alignment and component arrangement. Since light enters the lens, the image performance deteriorates and the image circle of the lens needs to be large.
There is a problem in that the manufacturing cost of the objective lens increases.
他の−は、トラッキング方向、タンジェンシャル方向と
もに、対物レンズをディスクに平行に、つまり対物レン
ズ光軸をディスクに直角に保持して平行移動させる、い
わゆる平行移動方式であるが、従来装置は、対物レンズ
を板ばね等の弾性部材を介して外枠内に支持し、これを
電磁力その他でフォーカス方向、トラッキング方向、お
よびタンジェンシャル方向に移動させるものであるため
、平行運動といっても、擬似的な平行運動しか得られず
、特に板ばねは対物レンズの重量で撓むため、直交三方
向への独立性の高い移動特性を得ることが困難である。The other method is the so-called parallel movement method in which the objective lens is held parallel to the disk in both the tracking direction and the tangential direction, that is, the objective lens optical axis is held perpendicular to the disk and moved in parallel. The objective lens is supported within the outer frame via an elastic member such as a leaf spring, and is moved in the focusing direction, tracking direction, and tangential direction using electromagnetic force or other means, so even though it is called parallel movement, Only pseudo-parallel motion can be obtained, and in particular, the leaf spring is bent by the weight of the objective lens, making it difficult to obtain highly independent movement characteristics in three orthogonal directions.
また板ばねを利用したものでは振動特性の向上を図るこ
とが難しい。Furthermore, it is difficult to improve the vibration characteristics with a device using a leaf spring.
本発明は、従来装置のこのような問題点を解消し、直交
三方向への位置調整を相互に独立性高く行ないうる対物
レンズ駆動装置を得ることを目的になされたもので、対
物レンズ保持体を電磁的に浮上させ、この状態でトラッ
キング方向、タンジェンシャル方向への移動制御を行な
わせるという着想に基づいて完成されたものである。The present invention has been made for the purpose of solving these problems of conventional devices and providing an objective lens driving device that can perform position adjustment in three orthogonal directions with high mutual independence. It was completed based on the idea of electromagnetically levitating the object and controlling its movement in the tracking direction and tangential direction in this state.
すなわち本発明の対物レンズ駆動装置は、対物レンズ保
持体を永久磁石に固定してこの永久磁石に作用する磁気
反発力で対物レンズ保持体を浮上させようとするもので
、対物レンズ保持体を環状永久磁石の内周部に固定する
一方、この環状永久磁石の外周部を複数の制振支持材を
介してスライダ上の固定外枠に支持し、この環状永久磁
石を、固定外枠に固定した磁石との磁気反発力により浮
上状態に保持し、さらに固定外枠には、この環状永久磁
石の上面または（および）下面に位置するトラッキング
方向駆動用、タンジェンシャル方向駆動用の各駆動コイ
ルを固定して、これらコイルの巻線方向の設定およびこ
れに流す電流の方向により、環状永久磁石、つまり対物
レンズ保持体をトラッキング方向およびタンジェンシャ
ル方向に駆動することを特徴としている。フォーカス方
向への位置調節は、対物レンズ保持体に適当な対物レン
ズのフォーカス方向位置調節手段を付設すればよい。In other words, the objective lens drive device of the present invention fixes the objective lens holder to a permanent magnet and attempts to levitate the objective lens holder using the magnetic repulsion force acting on the permanent magnet. While fixed to the inner peripheral part of the permanent magnet, the outer peripheral part of this annular permanent magnet was supported to a fixed outer frame on the slider via a plurality of vibration damping supports, and this annular permanent magnet was fixed to the fixed outer frame. It is held in a floating state by magnetic repulsion with the magnet, and drive coils for tracking direction drive and tangential direction drive located on the top or (and) bottom surface of this annular permanent magnet are fixed to the fixed outer frame. The annular permanent magnet, that is, the objective lens holder, is driven in the tracking direction and the tangential direction by setting the winding direction of these coils and the direction of the current flowing therein. To adjust the position in the focus direction, a suitable means for adjusting the position of the objective lens in the focus direction may be attached to the objective lens holder.
以下図示実施例について本発明を説明する。第１図は対
物レンズのｌｌの移動調節方向を説明するための図で、
１２は光学的記録ディスク、１３はこの光学的記録ディ
スク１２の上部または下部においてその略半径方向に延
びる案内レールで、対物レンズ１１はこの案内レール１
３に摺動可能に支持したスライダ１４に搭載されている
。いま光学的記録ディスク１２の半径方向をトラッキン
グ方向とすると、対物レンズ１１はこのトラッキング方
向Ｔｒと、光学的記録ディスク１２上に描かれた記録ド
ツト列１５のタンジェンシャル方向（接線方向）Ｔａ、
および対物レンズ１１のフォーカス方向Ｆに微細な位置
調節可能であることを要する。なおスライダ１４は一点
を中心に回動するアームの先端に固定され、擬似的にト
ラック方向に移動するように構成することもある。The invention will now be described with reference to the illustrated embodiments. FIG. 1 is a diagram for explaining the movement adjustment direction of objective lens ll.
12 is an optical recording disk; 13 is a guide rail extending approximately in the radial direction at the top or bottom of the optical recording disk 12; and the objective lens 11 is attached to the guide rail 1.
It is mounted on a slider 14 that is slidably supported on the slider 3. Now, assuming that the radial direction of the optical recording disk 12 is the tracking direction, the objective lens 11 moves in the tracking direction Tr and in the tangential direction (tangential direction) Ta of the recording dot array 15 drawn on the optical recording disk 12.
It is also necessary that the position of the objective lens 11 in the focus direction F can be finely adjusted. Note that the slider 14 may be fixed to the tip of an arm that rotates about one point, and may be configured to move in the track direction in a pseudo manner.
第２図、第３図は、対物レンズ１１を上記三方向に位置
調節可能とした本発明装置の実施例である。本装置は、
スライダ１４上に固定した固定外枠２０内に設けたもの
で、対物レンズｌｌと、対物レンズｌｌの磁気浮」一部
と、対物レンズ１１のトラッキング方向およびタンジェ
ンシャル方向駆動部と、対物レンズ１１のフォーカス方
向位置調節部とから構成されている。まず対物レンズ１
１の磁気浮上部を説明すると、対物レンズ１１の筒状の
鏡筒２１は抜は止めされた状態で筒状体２２内に摺動可
能に嵌められており、筒状体２２は環状永久磁石２３の
内周部に固定されている。環状永久磁石２３はその表裏
を異なる極性、例えば図の上面をＮ極、下面をＳ極とし
たもので、その外周部は、第３図に明らかなように、ト
ラッキング方向とタンジェンシャル方向の四箇所におい
て制振支持材２４を介して固定外枠２ｏに支持されてい
る。制振支持材２４はゴムその他の高分子材料から構成
すると、制御範囲を適当に限定し、かつ中心位置を定め
ることができ、また筒状体２２、つまり対物レンズ１１
の振動特性を優れたものとすることができる。対物レン
ズの移動調節範囲は、トラッキング方向、タンジェンシ
ャル方向とも、中立位置から±５００７７−Ｉｆ程度で
足りる。両者を合わせると、半径５００ ＩＬｍの円と
いうことになるから制振支持材２４はこの範囲の動きを
可能とするものであればよい。FIGS. 2 and 3 show embodiments of the apparatus of the present invention in which the objective lens 11 is adjustable in position in the three directions mentioned above. This device is
It is provided in a fixed outer frame 20 fixed on the slider 14, and includes the objective lens 11, a part of the magnetic float of the objective lens 11, the tracking direction and tangential direction driving section of the objective lens 11, and the objective lens 11. and a focus direction position adjustment section. First, objective lens 1
1, the cylindrical lens barrel 21 of the objective lens 11 is slidably fitted into a cylindrical body 22 while being prevented from being removed, and the cylindrical body 22 is fitted with an annular permanent magnet. It is fixed to the inner peripheral part of 23. The annular permanent magnet 23 has different polarities on its front and back surfaces, for example, the upper surface in the figure is an N pole and the lower surface is an S pole.As is clear from FIG. It is supported by the fixed outer frame 2o via vibration damping support members 24 at certain points. When the damping support member 24 is made of rubber or other polymeric material, the control range can be appropriately limited and the center position can be determined.
The vibration characteristics can be made excellent. The movement adjustment range of the objective lens is approximately ±50077-If from the neutral position in both the tracking direction and the tangential direction. Since the combination of both forms a circle with a radius of 500 ILm, the damping support member 24 may be of any material that allows movement within this range.
固定外枠２０内には、この環状永久磁石２３の下方に位
置させて、浮上用永久磁石２５が固定されている。すな
わちこの浮上用永久磁石２５の極性は、環状永久磁石２
３を浮」ニさせるように設定されるもので、」−の例で
は、その上面がＳ極、下面がＮ極となる。A levitation permanent magnet 25 is fixed within the fixed outer frame 20 so as to be positioned below the annular permanent magnet 23 . That is, the polarity of this levitation permanent magnet 25 is different from that of the annular permanent magnet 2.
In the example of ``-'', the upper surface is the south pole and the lower surface is the north pole.
トラッキング方向およびタンジェンシャル方向駆動部は
、上記環状永久磁石２３の上面および下面に、該環状永
久磁石２３とは被接触の状態で位置させたトラ、ツキン
グ方向用、タンジェンシャル方向用の各一対の駆動コイ
ル２６．２７からなっている。この駆動コイル２６．２
７は、第３図に明らかなように、トラッキング方向およ
びタンジェンシャル方向に対応させて筒状体２２の中心
に関し対称に各一対設けたもので、そのボビンまたは支
持部材２８．２９が固定外枠２０の内面に固定されてい
る。またこの駆動コイル２６．２７の巻線方向はトラッ
キング方向Ｔｒ、タンジェンシャル方向Ｔａと直角とな
っていて、これに正逆に電流を流すと、周知の電磁作用
により環状永久磁石２３つまり対物レンズｌｌがトラッ
キング方向Ｔｒ、およびタンジェンシャル方向Ｔａに移
動する。この駆動コイル２６．２７は環状永久磁石２３
の上下に対称に設けており、このため強い駆動力が得ら
れ、また上下のバランスがよくなるが、理論上は上下の
一方のみでも上記作用を得ることができる。なおこの駆
動コイル２６．２７は、勿論ボビンに巻かない空芯のも
のを用いてもよい。The tracking direction and tangential direction drive unit includes a pair of tracks, one for tracking direction, and one for tangential direction, which are positioned on the upper and lower surfaces of the annular permanent magnet 23 so as not to be in contact with the annular permanent magnet 23. It consists of drive coils 26,27. This drive coil 26.2
As is clear from FIG. 3, numerals 7 are provided in pairs symmetrically about the center of the cylindrical body 22 in correspondence with the tracking direction and the tangential direction, and the bobbins or support members 28 and 29 are attached to the fixed outer frame. It is fixed to the inner surface of 20. The winding direction of the drive coils 26 and 27 is perpendicular to the tracking direction Tr and the tangential direction Ta, and when a current is passed in the forward and reverse directions, the annular permanent magnet 23, that is, the objective lens II moves in the tracking direction Tr and the tangential direction Ta. This drive coil 26, 27 is an annular permanent magnet 23
They are arranged symmetrically above and below, and as a result, a strong driving force can be obtained and the balance between the top and bottom is good, but in theory, the above effect can be obtained with only one of the top and bottom. Of course, the drive coils 26 and 27 may be air-core ones that are not wound around a bobbin.
フォーカス方向位置調節部は、この実施例の特徴の一つ
であって、対物レンズ１１の鏡筒２１には、第２図の上
部、光学的記録ディスク１２側に、対物レンズ１１の光
軸と同心のボビン３０が一体に設けられており、このボ
ビン３０に同じく対物レンズ１１と同心にしてフォーカ
ス方向駆動コイル３１が巻かれている。他方、固定外枠
２０の内部の駆動コイル２６．２７の上には、フォーカ
ス駆動用永久磁石３２が固定され、この永久磁石３２の
下面、および上面に、ヨーク３３とプレート３４が固定
されている。ヨーク３３は断面り字状をしていてその上
端部が永久磁石３２と対向して、上記駆動コイル３１を
進入させる環状のギャップ３５を構成している。永久磁
石３２はその表裏で極性を異ならせたもので、したがっ
て環状ギャップ３５の内外周は異なる磁気極性を示し、
環状キャップ３５内に進入させた駆動コイル３１に電流
を流すと、対物レンズ１１が光軸方向に移動する。なお
固定外枠２０の上端部は内方に屈曲され、ボビン３０上
に延びて抜は止め縁３６を構成し、鏡筒２１が上方へ抜
けるのを防いでいる。また鏡筒２１は下方へ移動すると
、そのポビン３０がヨーク３３に当接するので、下方へ
抜けることはない。The focus direction position adjustment section is one of the features of this embodiment, and the lens barrel 21 of the objective lens 11 has an optical axis and an optical axis located on the optical recording disk 12 side in the upper part of FIG. A concentric bobbin 30 is integrally provided, and a focus direction drive coil 31 is wound around the bobbin 30 so as to be concentric with the objective lens 11. On the other hand, a focus drive permanent magnet 32 is fixed above the drive coils 26 and 27 inside the fixed outer frame 20, and a yoke 33 and a plate 34 are fixed to the lower and upper surfaces of this permanent magnet 32. . The yoke 33 has an angular cross-section, and its upper end faces the permanent magnet 32, forming an annular gap 35 into which the drive coil 31 enters. The permanent magnet 32 has different polarities on its front and back sides, so the inner and outer peripheries of the annular gap 35 exhibit different magnetic polarities,
When a current is applied to the drive coil 31 entered into the annular cap 35, the objective lens 11 moves in the optical axis direction. The upper end of the fixed outer frame 20 is bent inward and extends over the bobbin 30 to form a retaining edge 36 to prevent the lens barrel 21 from coming off upward. Further, when the lens barrel 21 moves downward, its pobbin 30 comes into contact with the yoke 33, so that it does not come off downward.
したがって上記構成の本装置は、一対の駆動コイル２６
に第３図において同方向の正逆の電流を流すと、環状永
久磁石２３がトラッキング方向Ｔｒの前後に移動し、一
対の駆動コイル２７に同様に正逆の電流を流すと、環状
永久磁石２３がタンジェンシャル方向Ｔａの前後に移動
する。したがって駆動コイル２６と駆動コイル２７に流
す電流を制御することにより、トラッキング方向とタン
ジェンシャル方向、および両者の複合した方向に自由に
対物レンズ１１を移動させて正確なトラッキングを行な
うことができる。このトラッキング方向およびタンジェ
ンシャル方向の駆動は、環状永久磁石２３と固定永久磁
石２５の電磁反発力により、環状永久磁石２３および筒
状体２２が制振支持材２４以外は機械的な接触がない浮
上状態で行なわれるから、非常に動作特性がよく、また
トラッキング方向とタンジェンシャル方向の干渉、つま
りクロストークが生じる余地が少ない。Therefore, the present device having the above configuration has a pair of drive coils 26
When forward and reverse currents in the same direction are passed in FIG. moves back and forth in the tangential direction Ta. Therefore, by controlling the currents flowing through the drive coils 26 and 27, it is possible to freely move the objective lens 11 in the tracking direction, the tangential direction, or a combination of both directions to perform accurate tracking. The driving in the tracking direction and the tangential direction is caused by the electromagnetic repulsion between the annular permanent magnet 23 and the fixed permanent magnet 25, so that the annular permanent magnet 23 and the cylindrical body 22 float with no mechanical contact other than the vibration damping support member 24. Since the tracking is performed in the same state, the operating characteristics are very good, and there is little chance of interference between the tracking direction and the tangential direction, that is, crosstalk.
そして制振支持材２４としてゴム等の高分子材料を用い
ると、特に振動特性が向上する。When a polymeric material such as rubber is used as the vibration damping support material 24, the vibration characteristics are particularly improved.
また駆動コイル３１に正逆の電流を流すと、周知の電磁
作用により、筒状体２２に摺動自在に支持された鏡筒２
１が光軸方向に正逆に移動するから、フォーカシングを
行なうことができる。Furthermore, when a forward and reverse current is applied to the drive coil 31, the lens barrel 2, which is slidably supported by the cylindrical body 22, is
Since the lens 1 moves forward and backward in the optical axis direction, focusing can be performed.
上記実施例のフォーカス方向位置調節手段は、環状永久
磁石２３の移動位置に無関係に、つまりトラッキング方
向、タンジェンシャル方向の位置調節とのクロストーク
なしに純粋にフォーカス方向に対物レンズ１１を駆動で
きるという特徴があ１す
る。また図示実施例によれば、浮上用永久磁石２５、環
状永久磁石２３、駆動コイル２６．駆動コイル２７、永
久磁石３２等の要素が固定外枠２０内に積層状態で配置
されるため、構造が簡単でコンパクトな対物レンズ駆動
装置が得られる。さらに光軸に対して各構成要素が軸対
称に配置されているため、特性の偏りを見つけやすく、
検査上も有利である。もっとも、対物レンズのフォーカ
ス方向位置調節手段は、実施例以外の構造を用いても、
対物レンズ保持体を浮上状態でトラッキング方向および
タンジェンシャル方向に駆動制御することができるとい
う効果は失われない。The focus direction position adjustment means of the above embodiment can drive the objective lens 11 purely in the focus direction regardless of the moving position of the annular permanent magnet 23, that is, without crosstalk with position adjustment in the tracking direction or tangential direction. It has one characteristic. Further, according to the illustrated embodiment, a levitation permanent magnet 25, an annular permanent magnet 23, a drive coil 26. Since elements such as the drive coil 27 and the permanent magnet 32 are arranged in a stacked manner within the fixed outer frame 20, an objective lens drive device having a simple and compact structure can be obtained. Furthermore, since each component is arranged axially symmetrically with respect to the optical axis, it is easy to detect deviations in characteristics.
It is also advantageous for inspection. However, even if the means for adjusting the position of the objective lens in the focus direction uses a structure other than that of the embodiment,
The effect of being able to drive and control the objective lens holder in the tracking direction and the tangential direction in a floating state is not lost.
以上のように本発明の対物レンズ駆動装置は、対物レン
ズ保持体を、制振支持材を介して固定外枠に支持された
環状永久磁石と、この環状永久磁石を磁気反発力で浮上
させる固定磁石とにより浮」−状態としたので、環状永
久磁石に電磁力を作用させてトラッキング方向、タンジ
ェンシャル方向に移動させる駆動コイルによる位置制御
をクロストークの問題なく正確に行なうことができる。As described above, the objective lens driving device of the present invention includes an annular permanent magnet that holds an objective lens holder on a fixed outer frame via a vibration damping support, and a fixed fixed magnet that levitates the annular permanent magnet by magnetic repulsion. Since the magnet is placed in a floating state, the position control by the drive coil, which applies electromagnetic force to the annular permanent magnet to move it in the tracking direction and the tangential direction, can be performed accurately without the problem of crosstalk.
まｌ ま
た駆動コイルは固定外枠側に固定されていて、環状永久
磁石を含む可動部側には重量増加要素がないため、可動
部側重量の増加を抑えた、動作特性に優れた対物レンズ
駆動装置を得ることができ、また駆動コイルは、これを
可動部側に搭載する場合と比較して重量や形状の増大を
考慮する必要がないから、必要な動作特性を得るための
設計の自由度が高くなるという効果がある。In addition, the drive coil is fixed to the fixed outer frame side, and there are no weight-increasing elements on the movable part side including the annular permanent magnet, so the objective lens has excellent operating characteristics and suppresses the increase in weight on the movable part side. Since the drive coil does not have to consider an increase in weight or shape compared to the case where it is mounted on the moving part side, there is freedom in design to obtain the required operating characteristics. This has the effect of increasing the degree of
第１図は光学的情報記録読取装置の対物レンズの位置調
節方向を説明するための要部の斜視図、第２図は本発明
に係る対物レンズ駆動装置の実施例を示す縦断面図、第
３図は第２図の■−■線に沿う断面図である。
１１・・・対物レンズ、１２・・・光学的記録ディスク
、１４・・・スライダ、２０・・・固定外枠、２１・・
・鏡筒、２２・・・筒状体、２３・・・環状永久磁石、
２４・・・制振支持材、２５・・・浮上用永久磁石（固
定磁石）、、２６・・・トラッキング方向駆動コイル、
２７・・・タンジェンシャル方向駆動コイル、３１・・
・フォーカス方向駆動コイル、３２・・・永久磁石、３
３・・・ヨーク、３４・・・プレート、３５・・・環状
ギャップ。
特許出願人 旭光学工業株式会社
同代理人 三 浦 邦 夫
５
第１図FIG. 1 is a perspective view of a main part for explaining the position adjustment direction of an objective lens of an optical information recording/reading device, FIG. 2 is a longitudinal sectional view showing an embodiment of an objective lens driving device according to the present invention, FIG. 3 is a sectional view taken along the line ■-■ in FIG. 2. DESCRIPTION OF SYMBOLS 11... Objective lens, 12... Optical recording disk, 14... Slider, 20... Fixed outer frame, 21...
- Lens barrel, 22... cylindrical body, 23... annular permanent magnet,
24... Vibration damping support material, 25... Permanent magnet for levitation (fixed magnet), 26... Tracking direction drive coil,
27...Tangential direction drive coil, 31...
・Focus direction drive coil, 32...Permanent magnet, 3
3... Yoke, 34... Plate, 35... Annular gap. Patent applicant Asahi Optical Co., Ltd. Agent Kunio Miura 5 Figure 1
Claims (1)
ライダに対物レンズを搭載し、この対物レンズを該レン
ズのフォーカス方向、上記光学的記録ディスクのトラッ
ク方向、および同タンジェンシャル方向に位置調節する
手段を設けた光学的情報記録再生装置の対物レンズ駆動
装置において、上記スライダ上に固定した固定外枠と、
この固定外枠の中心部に位置させた対物レンズ保持体と
、この対物レンズ保持体に保持された対物レンズのフォ
ーカス方向位置調節手段と、内周部が上記対物レンズ保
持体に固定され、外周部が複数の制振支持材を介して上
記固定外枠に支持された環状永久磁石と、この環状永久
磁石に磁気反発力を作用させて、上記対物レンズ保持体
および該環状永久磁石を浮上状態に保持する、上記固定
外枠に固定した固定磁石と、上記環状永久磁石の上面ま
たは（および）下面に位置するように上記固定外枠に固
定した、上記トラッキング方向用、タンジェンシャル方
向用の駆動コイルとを備え、これらの駆動コイルは、こ
れに流す電流により、上記環状永久磁石との電磁作用に
よって該環状永久磁石およびこれに保持した対物レンズ
保持体を上記トラッキング方向およびタンジェンシャル
方向に駆動するように巻線の方向が設定されている光学
的情報記録再生装置の対物レンズ駆動装置。 （２、特許請求の範囲第１項において、対物レンズ保持
枠は筒状体であって、この筒状体内に対物レンズが摺動
自在に嵌められており、この対物レンズと上記固定外枠
との間に、対物レンズのフォーカス方向位置調節手段が
設けられている光学的情報記録再生装置の対物レンズ駆
動装置。 （３）特許請求の範囲第２項において、対物レンズのフ
ォーカス方向位置調節手段は、対物レンズと一体に、該
レンズの光軸と同心に設けた駆動コイルと、この駆動コ
イルを進入させる環状のギャップを有し、このギャップ
の内外周を異なる磁性に磁化させる磁気手段とから構成
された電磁的位置調節手段からなっている光学的情報記
録再生装置の対物レンズ駆動装置。[Claims] (1) An objective lens is mounted on a slider that moves in the track direction of the optical recording disk, and the objective lens is moved in the focus direction of the lens, in the track direction of the optical recording disk, and in the tangential direction of the optical recording disk. In an objective lens driving device for an optical information recording/reproducing device, the objective lens driving device is provided with a means for adjusting the position in a direction, and a fixed outer frame fixed on the slider;
An objective lens holder positioned at the center of this fixed outer frame, a means for adjusting the position of the objective lens in the focus direction held by this objective lens holder, an inner peripheral part fixed to the objective lens holder, and an outer periphery The annular permanent magnet is supported by the fixed outer frame through a plurality of vibration damping supports, and a magnetic repulsion force is applied to the annular permanent magnet to cause the objective lens holder and the annular permanent magnet to be in a floating state. a fixed magnet fixed to the fixed outer frame, and a drive for the tracking direction and tangential direction fixed to the fixed outer frame so as to be located on the upper surface or (and) the lower surface of the annular permanent magnet. These driving coils drive the annular permanent magnet and the objective lens holder held therein in the tracking direction and the tangential direction by electromagnetic interaction with the annular permanent magnet by the current flowing therein. An objective lens drive device for an optical information recording/reproducing device in which the winding direction is set as follows. (2. In claim 1, the objective lens holding frame is a cylindrical body, and the objective lens is slidably fitted into the cylindrical body, and the objective lens and the fixed outer frame are connected to each other. An objective lens driving device for an optical information recording/reproducing apparatus, in which a means for adjusting the position of the objective lens in the focus direction is provided between the parts. , consisting of a driving coil provided integrally with the objective lens and concentric with the optical axis of the lens, and a magnetic means having an annular gap into which the driving coil enters and magnetizing the inner and outer peripheries of this gap with different magnetisms. An objective lens driving device for an optical information recording/reproducing device comprising an electromagnetic position adjustment means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19395783A JPS6085446A (en) | 1983-10-17 | 1983-10-17 | Object lens driving device of optical information recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19395783A JPS6085446A (en) | 1983-10-17 | 1983-10-17 | Object lens driving device of optical information recording and reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6085446A true JPS6085446A (en) | 1985-05-14 |
| JPH0522297B2 JPH0522297B2 (en) | 1993-03-29 |
Family
ID=16316568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19395783A Granted JPS6085446A (en) | 1983-10-17 | 1983-10-17 | Object lens driving device of optical information recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6085446A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63244417A (en) * | 1987-03-31 | 1988-10-11 | Toshiba Corp | Information reproducing device |
| US4857781A (en) * | 1988-07-13 | 1989-08-15 | Eastman Kodak Company | High-speed non-contact linear motor with magnetic levitation |
| WO1999054872A1 (en) * | 1998-04-17 | 1999-10-28 | Koninklijke Philips Electronics N.V. | Optical scanning device comprising a lens system with a compact actuator |
| KR100761630B1 (en) | 2003-04-16 | 2007-09-27 | 니혼 덴산 산쿄 가부시키가이샤 | Apparatus for driving lens and mobile equipment having camera attached thereto |
| CN103744436A (en) * | 2014-01-02 | 2014-04-23 | 中国科学院空间应用工程与技术中心 | High-precision attitude stabilization device of concentrically local spherical surface |
| CN103744436B (en) * | 2014-01-02 | 2016-11-30 | 中国科学院空间应用工程与技术中心 | A kind of partial sphere high-precision attitude stabilising arrangement with one heart |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5782234A (en) * | 1980-11-11 | 1982-05-22 | Mitsubishi Electric Corp | Optical head |
| JPS5817552A (en) * | 1981-07-10 | 1983-02-01 | エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン | Opto-electronic unit |
-
1983
- 1983-10-17 JP JP19395783A patent/JPS6085446A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5782234A (en) * | 1980-11-11 | 1982-05-22 | Mitsubishi Electric Corp | Optical head |
| JPS5817552A (en) * | 1981-07-10 | 1983-02-01 | エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン | Opto-electronic unit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63244417A (en) * | 1987-03-31 | 1988-10-11 | Toshiba Corp | Information reproducing device |
| US4857781A (en) * | 1988-07-13 | 1989-08-15 | Eastman Kodak Company | High-speed non-contact linear motor with magnetic levitation |
| WO1999054872A1 (en) * | 1998-04-17 | 1999-10-28 | Koninklijke Philips Electronics N.V. | Optical scanning device comprising a lens system with a compact actuator |
| KR100761630B1 (en) | 2003-04-16 | 2007-09-27 | 니혼 덴산 산쿄 가부시키가이샤 | Apparatus for driving lens and mobile equipment having camera attached thereto |
| CN103744436A (en) * | 2014-01-02 | 2014-04-23 | 中国科学院空间应用工程与技术中心 | High-precision attitude stabilization device of concentrically local spherical surface |
| CN103744436B (en) * | 2014-01-02 | 2016-11-30 | 中国科学院空间应用工程与技术中心 | A kind of partial sphere high-precision attitude stabilising arrangement with one heart |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0522297B2 (en) | 1993-03-29 |
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