JPH0522297B2 - - Google Patents
Info
- Publication number
- JPH0522297B2 JPH0522297B2 JP58193957A JP19395783A JPH0522297B2 JP H0522297 B2 JPH0522297 B2 JP H0522297B2 JP 58193957 A JP58193957 A JP 58193957A JP 19395783 A JP19395783 A JP 19395783A JP H0522297 B2 JPH0522297 B2 JP H0522297B2
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- fixed
- permanent magnet
- outer frame
- cylindrical body
- 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
- 230000003287 optical effect Effects 0.000 claims description 27
- 238000007667 floating Methods 0.000 claims description 5
- 238000013016 damping Methods 0.000 description 8
- 238000005339 levitation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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)
Description
【発明の詳細な説明】
本発明は、ビデオ、オーデイオ等に広く用いら
れつつある光学的記録デイ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イスク上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 is an optical recording disk that is widely used for video, audio, etc., and when recording information or reading recorded information, a laser beam is emitted onto the disk. The present invention relates to a driving device for an objective lens for convergence.
この種の光学的情報記録再生装置は、読取を例
にとると、光学的記録デイ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
から上記デイスクに記録されている情報を読み取
るものであり、対物レンズはデイスクのトラツク
を横切る半径方向（トラツキング方向）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オーカス方向の位置調
節手段を備え、さらに1μmオーダの間隔で並ぶ記
録ドツトに対し正確なトラツキングを行なわせる
ため、トラツキング方向およびタンジエンシヤル
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 radial direction (tracking direction) across the tracks of the disk. The objective lens is equipped with a position adjustment means in the focus direction for focus adjustment, and also has a position adjustment means in the tracking direction and tangential direction in order to accurately track the recording dots arranged at intervals of 1 μm order. Adjustment means are 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、次の二方法が代表的なものとして知
られている。その一は、焦点調節はフオーカスモ
ータにより行ない、トラツキング方向、タンジエ
ンシヤ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。他の一は、トラ
ツキング方向、タンジエンシヤル方向ともに、対
物レンズをデイスクに平行に、つまり対物レンズ
光軸をデイ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オーカス
方向、トラツキング方向、およびタンジエンシヤ
ル方向に移動させるものであるため、平行運動と
いつても、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。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。 The following two methods are known as typical methods for fine adjustment in the three orthogonal directions in conventional devices. One of them is that focus adjustment is performed by a focus motor, and fine adjustment in the tracking direction and tangential direction is performed by changing the direction of 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 is incident on the objective lens, the image performance deteriorates, and the image circle of the lens needs to be made large, so there is a problem that the manufacturing cost of the objective lens increases. 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. The lens is supported within an 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. In particular, since the leaf spring is bent by the weight of the objective lens, it is difficult to obtain highly independent movement characteristics in three orthogonal directions. 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、この状態でトラツキング方向、タンジ
エンシヤ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 robot 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、光学
的記録デイスクのトラツキング方向に移動するス
ライダに搭載された対物レンズと、この対物レン
ズのフオーカス方向、上記光学的記録デイスクの
トラツキング方向および同タンジエンシヤル方向
位置を調節する手段とを備えた光学的情報記録再
生装置において、上記スライダに固定された固定
外枠と、内部に上記対物レンズをフオーカス方向
に摺動自在に保持して上記固定外枠内に配置され
た筒状体と、上記対物レンズと上記固定外枠との
間に設けられた、上記対物レンズをフオーカス方
向に移動させるフオーカス方向位置調節手段と、
複数の制振部材を介して上記トラツキング方向お
よびタンジエンシヤル方向に移動自在に上記固定
外枠に支持され、内周部に上記筒状体が固定され
た、上記対物レンズの光軸と直交する円板状の環
状永久磁石と、上記環状永久磁石に磁気反発力を
作用せて上記環状永久磁石、上記筒状体および上
記対物レンズを浮上状態に保持する、上記固定外
枠に固定された固定磁石と、上記環状永久磁石の
上下面の少なくとも一方の面に対向配置され、磁
気作用により上記環状永久磁石を介して上記筒状
体をトラツキング方向およびタンジエンシヤル方
向に駆動する、上記固定外枠に固定されたトラツ
キング方向用駆動コイルおよびタンジエンシヤル
方向用駆動コイルとを設けたことに特徴を有す
る。 That is, the objective lens driving device of the present invention has an objective lens mounted on a slider that moves in the tracking direction of the optical recording disk, and a focus direction of the objective lens, and a position in the tracking direction and tangential direction of the optical recording disk. an optical information recording/reproducing apparatus comprising: a fixed outer frame fixed to the slider; and an optical information recording/reproducing apparatus having a fixed outer frame fixed to the slider; a cylindrical body, and a focus direction position adjusting means for moving the objective lens in the focus direction, which is provided between the objective lens and the fixed outer frame;
a disk perpendicular to the optical axis of the objective lens, which is supported by the fixed outer frame so as to be movable in the tracking direction and the tangential direction via a plurality of vibration damping members, and has the cylindrical body fixed to the inner circumference thereof; a fixed magnet fixed to the fixed outer frame that maintains the annular permanent magnet, the cylindrical body, and the objective lens in a floating state by applying a magnetic repulsion force to the annular permanent magnet; , which is fixed to the fixed outer frame and is arranged to face at least one of the upper and lower surfaces of the annular permanent magnet, and drives the cylindrical body in the tracking direction and the tangential direction via the annular permanent magnet by magnetic action. It is characterized by providing a tracking direction drive coil and a tangential direction drive coil.
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１１の移動調節方向を説明す
るための図で、１２は光学的記録デイスク、１３
はこの光学的記録デイスク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１３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
光学的記録デイスク１２の半径方向をトラツキン
グ方向とすると、対物レンズ１１はこのトラツキ
ング方向Trと、光学的記録デイスク１２上に描
かれた記録ドツト列１５のタンジエンシヤル方向
（接線方向）Ta、および対物レンズ１１のフオー
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、擬似的にトラツク方向
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 direction of movement adjustment of the objective lens 11, in which 12 is an optical recording disk, 13 is an optical recording disk;
is a guide rail extending substantially in the radial direction at the top or bottom of the optical recording disk 12;
The objective lens 11 is mounted on a slider 14 that is slidably supported on the guide rail 13. Now, assuming that the radial direction of the optical recording disk 12 is the tracking direction, the objective lens 11 moves along the tracking direction Tr, the tangential direction Ta of the recording dot array 15 drawn on the optical recording disk 12, and the objective lens 11. It is necessary that the position of the lens 11 in the focus direction F can be finely adjusted. The slider 14 may be fixed to the tip of an arm that rotates about one point, and may be configured to move in a pseudo track direction.
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１１と、対
物レンズ１１の磁気浮上部と、対物レンズ１１の
トラツキング方向およびタンジエンシヤル方向駆
動部と、対物レンズ１１のフオーカス方向位置調
節部とから構成されている。まず対物レンズ１１
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は抜け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、トラツキング
方向とタンジエンシヤ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２０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、トラツキング方向、タンジエンシヤル方向と
も、中立位置から±500μm程度で足りる。両者を
合わせると、半径500μm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 installed in a fixed outer frame 20 fixed on a slider 14, and includes an objective lens 11, a magnetically levitated part of the objective lens 11, a tracking direction and tangential direction driving part of the objective lens 11, and an objective lens 11. 11 focus direction position adjustment sections. First, objective lens 11
To explain the magnetic levitation part, the cylindrical lens barrel 21 of the objective lens 11 is held in place by the cylindrical body 22.
The cylindrical body 22 is slidably fitted within the annular permanent magnet 23, and the cylindrical body 22 is fixed to the inner circumference of the annular permanent magnet 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 20 via a vibration damping support member 24 . When the vibration damping support member 24 is made of rubber or other polymer material, the control range can be appropriately limited and the center position can be determined, and the cylindrical body 22,
In other words, the vibration characteristics of the objective lens 11 can be made excellent. The movement adjustment range of the objective lens is approximately ±500 μm 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 μm, the damping support member 24 may be 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２３を浮上させるように設定
されるもので、上の例では、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 set so as to levitate the annular permanent magnet 23, and in the above example, the upper surface is the S pole and the lower surface is the N pole.
トラツキング方向およびタンジエンシヤル方向
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、タンジエンシヤル
方向用の各一対の駆動コイル２６，２７からなつ
ている。この駆動コイル２６，２７は、第３図に
明らかなように、トラツキング方向およびタンジ
エンシヤ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２８，２８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
巻線方向はトラツキング方向Tr，タンジエンシ
ヤル方向Taと直角となつていて、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１１がトラツキング方向
Tr、およびタンジエンシヤル方向Taに移動す
る。この駆動コイル２６，２７は環状永久磁石２
３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 drive coils 26 for the tracking direction and a tangential direction, which are positioned on the upper and lower surfaces of the annular permanent magnet 23 in a state in which the annular permanent magnet 23 is not in contact with the annular permanent magnet 23. It starts from 27. As is clear from FIG. 3, the drive coils 26 and 27 are provided in pairs symmetrically with respect to the center of the cylindrical body 22 in correspondence with the tracking direction and the tangential direction. is fixed to the inner surface of the fixed outer frame 20. The winding directions of the drive coils 26 and 27 are 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 11 is tracking direction
Tr, and move in the tangential direction Ta. These drive coils 26 and 27 are connected to the annular permanent magnet 2.
3 are installed symmetrically above and below, which provides strong driving force and improves the balance between the top and bottom.
Theoretically, the above effect can be obtained with only one of the upper and lower parts. Note that the drive coils 26 and 27 may of course be air-core coils that are not wound around a bobbin.
フオーカス方向位置調節部は、この実施例の特
徴の一つであつて、対物レンズ１１の鏡筒２１に
は、第２図の上部、光学的記録デイスク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と同心にしてフオーカス方向駆動
コイル３１が巻かれている。他方、コイル外枠２
０の内部の駆動コイル２６，２７の上には、フオ
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
Ｌ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
ギヤツプ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、したがつて環
状ギヤツプ３５の内外周は異なる磁気極性を示
し、環状ギヤツプ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上に延びて抜け止め縁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、そのボビ
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 at the top 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, the coil outer frame 2
A focus driving permanent magnet 32 is fixed above the drive coils 26 and 27 inside the 0, 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 L-shaped 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 the front and back sides, so the inner and outer circumferences of the annular gap 35 exhibit different magnetic polarities, and when a current is passed through the drive coil 31 inserted into the annular gap 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.
This prevents the lens barrel 21 from coming off upward. Further, when the lens barrel 21 moves downward, its bobbin 30 comes into contact with the yoke 33, so that it does not come off downward.
したがつ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がトラツキング方向
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
ンジエンシヤル方向Taの前後に移動する。した
がつて駆動コイル２６と駆動コイル２７に流す電
流を制御することにより、トラツキング方向とタ
ンジエンシヤル方向、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
ツキングを行なうことができる。このトラツキン
グ方向およびタンジエンシヤル方向の駆動は、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
トラツキング方向とタンジエンシヤル方向の干
渉、つまりクロストークが生じる余地が少ない。
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。 Therefore, in this device having the above configuration, when forward and reverse currents in the same direction as shown in FIG.
When the annular permanent magnet 23 moves forward and backward in the tangential direction Ta, the annular permanent magnet 23 moves forward and backward in the tangential direction Ta by moving forward and backward currents through the pair of drive coils 27. 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 are in a floating state with no mechanical contact other than the vibration damping support member 24. Since this is carried out in the tangential direction, the operating characteristics are very good, and there is little room for interference between the tracking direction and the tangential direction, that is, crosstalk.
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２１がこの筒状体２２に摺動自在に
支持されて光軸方向に正逆に移動するから、フオ
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 21, which is slidably supported by the cylindrical body 22, is slidably supported by the cylindrical body 22 due to well-known electromagnetic action, and the optical axis Since it moves forward and backward in the direction, focusing can be performed.
上記実施例のフオ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
トラツキング方向、タンジエンシヤル方向の位置
調節とのクロストークなしに純粋にフオーカス方
向に対物レンズ１１を駆動できるという特徴があ
る。また図示実施例によれば、浮上用永久磁石２
５、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。もつとも、対物レンズのフオーカス
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ツキング
方向およびタンジエンシヤ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 adjusting means of the above embodiment is as follows:
The objective lens 11 can be driven 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. Further, according to the illustrated embodiment, the levitation permanent magnet 2
5. Elements such as the annular permanent magnet 23, drive coil 26, drive coil 27, and permanent magnet 32 are fixed to the outer frame 20
Since the objective lens driving device is arranged in a stacked state within the interior, an objective lens driving 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 find deviations in characteristics, which is advantageous for inspection. However, even if the objective lens focus direction position adjusting means uses a structure other than 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 will not be lost.
以上のように本発明の対物レンズ駆動装置は、
筒状体を、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上状態とし
たので、環状永久磁石に電磁力を作用させてトラ
ツキング方向、タンジエンシヤル方向に移動させ
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。さらに、筒状
体は対物レンズを摺動自在に支持するものである
から、この筒状体の位置を制御することにより、
対物レンズのトラツキング方向およびタンジエン
シヤル方向を容易かつ確実に制御することでき
る。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。 As described above, the objective lens driving device of the present invention has the following features:
The cylindrical body was brought into a floating state by an annular permanent magnet supported by a fixed outer frame via a vibration-damping support material, and a fixed magnet that levitated this annular permanent magnet by magnetic repulsion. Position control using a drive coil that moves in the tracking direction and tangential direction by applying force can be performed accurately without the problem of crosstalk. Furthermore, since the cylindrical body supports the objective lens in a slidable manner, by controlling the position of this cylindrical body,
The tracking direction and tangential direction of the objective lens can be easily and reliably controlled. In addition, the drive coil is fixed to the fixed outer frame side, and there is no weight-increasing element on the movable part side including the annular permanent magnet, so the objective lens drive device has excellent operating characteristics and suppresses increase in weight on the movable part side. In addition, there is no need to consider an increase in the weight or shape of the drive coil compared to when it is mounted on the moving part, so there is more freedom in design to obtain the required operating characteristics. It has the effect of increasing the price.
さらに本発明は、対物レンズ（筒状体および環
状永久磁石）をトラツキング方向およびタンジエ
ンシヤル方向のいずれに駆動しても、環状永久磁
石と駆動コイルとの間隔が変化せず、磁場の変化
もごく小さいので、トラツキング方向およびタン
ジエンシヤル方向のいずれの方向に駆動しても、
他方向への駆動に与える影響が小さく、高精度の
駆動（調整）が可能になる。さらに、いずれの方
向へ駆動しても他方の駆動力を弱めることがない
ので、環状永久磁石と駆動コイルを大型化しなく
ても、駆動ストロークを大きくとることが可能に
なる。 Furthermore, in the present invention, even if the objective lens (cylindrical body and annular permanent magnet) is driven in either the tracking direction or the tangential direction, the distance between the annular permanent magnet and the driving coil does not change, and the change in the magnetic field is also very small. Therefore, regardless of whether it is driven in the tracking direction or the tangential direction,
The effect on driving in other directions is small, and highly accurate driving (adjustment) is possible. Furthermore, since driving in either direction does not weaken the driving force in the other, it is possible to increase the driving stroke without increasing the size of the annular permanent magnet and the driving coil.
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……光学的記録デイ
スク、１４……スライダ、２０……固定外枠、２
１……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……トラツキング方向駆
動コイル、２７……タンジエンシヤル方向駆動コ
イル、３１……フオーカス方向駆動コイル、３２
……永久磁石、３３……ヨーク、３４……プレー
ト、３５……環状ギヤツプ。
FIG. 1 is a perspective view of the main parts for explaining the position adjustment direction of the objective lens of the optical information recording/reading device;
FIG. 2 is a longitudinal cross-sectional view showing an embodiment of the objective lens driving device according to the present invention, and FIG. 3 is a cross-sectional view taken along the - line in FIG. 2. 11...Objective lens, 12...Optical recording disk, 14...Slider, 20...Fixed outer frame, 2
DESCRIPTION OF SYMBOLS 1... 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, 33...Yoke, 34...Plate, 35...Annular gap.
Claims (1)
動するスライダに搭載された対物レンズと、この
対物レンズのフオーカス方向、上記光学的記録デ
イスクのトラツキング方向および同タンジエンシ
ヤル方向位置を調節する手段とを備えた光学的情
報記録再生装置における対物レンズ駆動装置にお
いて、 上記スライダに固定された固定外枠； 内部に上記対物レンズをフオーカス方向に摺動
自在に保持して上記固定外枠内に配置された筒状
体； 上記対物レンズと上記固定外枠との間に設けら
れた、上記対物レンズをフオーカス方向に移動さ
せるフオーカス方向位置調節手段； 複数の制振部材を介して上記固定外枠に上記ト
ラツキング方向およびタンジエンシヤル方向に移
動自在に支持され、内周部に上記筒状体が固定さ
れた、上記対物レンズの光軸と直交する円板状を
呈する環状永久磁石； 上記環状永久磁石に磁気反発力を作用させて上
記環状永久磁石、上記筒状体および上記対物レン
ズを浮上状態に保持する、上記固定外枠に固定さ
れた固定磁石；および、 上記環状永久磁石の上下面の少なくとも一方の
面に対向配置され、磁気作用により上記環状永久
磁石を介して上記筒状体をトラツキング方向およ
びタンジエンシヤル方向に駆動する、上記固定外
枠に固定されたトラツキング方向用駆動コイルお
よびタンジエンシヤル方向用駆動コイル； を設けたことを特徴とす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項に記載の上記フオーカ
ス方向位置調節手段は、上記対物レンズに固定さ
れた環状の駆動コイルと、上記固定外枠に固定さ
れ、上記駆動コイルが非接触で進入する環状のギ
ヤツプと、このギヤツプの内壁を磁化させる磁気
手段とを備えた磁気的位置調節手段、からなる光
学的情報記録再生装置の対物レンズ駆動装置。[Scope of Claims] 1. An objective lens mounted on a slider that moves in the tracking direction of an optical recording disk, and means for adjusting the focus direction of this objective lens, the tracking direction of the optical recording disk, and the tangential direction position thereof. An objective lens drive device for an optical information recording and reproducing device, comprising: a fixed outer frame fixed to the slider; the objective lens is held inside so as to be slidable in the focus direction and is disposed within the fixed outer frame; a cylindrical body; a focus direction position adjusting means for moving the objective lens in the focus direction, provided between the objective lens and the fixed outer frame; An annular permanent magnet that is movably supported in the tracking direction and the tangential direction, and has the cylindrical body fixed to its inner circumference and has a disc shape orthogonal to the optical axis of the objective lens; A fixed magnet fixed to the fixed outer frame that maintains the annular permanent magnet, the cylindrical body, and the objective lens in a floating state by applying a repulsive force; and at least one of the upper and lower surfaces of the annular permanent magnet. a tracking direction drive coil and a tangential direction drive coil fixed to the fixed outer frame, which are arranged to face the surface and drive the cylindrical body in the tracking direction and the tangential direction via the annular permanent magnet by magnetic action; An objective lens driving device for an optical information recording/reproducing device, characterized in that it is provided with: 2. The focus direction position adjusting means according to claim 1 includes an annular drive coil fixed to the objective lens and an annular drive coil fixed to the fixed outer frame into which the drive coil enters without contact. 1. An objective lens driving device for an optical information recording/reproducing apparatus, comprising a gap and a magnetic position adjusting means having a magnetic means for magnetizing the inner wall of the gap.
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 JPS6085446A (en) | 1985-05-14 |
| JPH0522297B2 true 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) |
Families Citing this family (4)
| 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 |
| EP0990232B1 (en) * | 1998-04-17 | 2005-07-27 | Koninklijke Philips Electronics N.V. | Optical scanning device comprising a lens system with a compact actuator |
| US7440201B2 (en) | 2003-04-16 | 2008-10-21 | Nidec Sankyo Corporation | Lens driving device and portable equipment with camera |
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6085446A (en) | 1985-05-14 |
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