JPH0516091B2 - - Google Patents
Info
- Publication number
- JPH0516091B2 JPH0516091B2 JP58068771A JP6877183A JPH0516091B2 JP H0516091 B2 JPH0516091 B2 JP H0516091B2 JP 58068771 A JP58068771 A JP 58068771A JP 6877183 A JP6877183 A JP 6877183A JP H0516091 B2 JPH0516091 B2 JP H0516091B2
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- tracking
- objective lens
- optical disk
- control device
- 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 26
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10504—Recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10532—Heads
-
- 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
-
- 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
- G11B7/0932—Details of sprung supports
Landscapes
- Optical Recording Or Reproduction (AREA)
- Automatic Focus Adjustment (AREA)
Description
【発明の詳細な説明】
＜技術分野＞
本発明は磁性膜を記録媒体としレーザ光等の光
ビームを上記記録媒体に照射するこにより情報の
記録・再生・消去等を行なう光磁気デイスク装置
に用いて好適な光集束位置制御装置に関する。[Detailed Description of the Invention] <Technical Field> The present invention relates to a magneto-optical disk device that uses a magnetic film as a recording medium and records, reproduces, erases, etc. information by irradiating the recording medium with a light beam such as a laser beam. The present invention relates to a light focusing position control device suitable for use.
＜従来技術＞
従来、光デイスク装置においてデイスクはその
回転時に面振れを生じ、その為デイスクの記録ト
ラツクはデイスクを照射する入射レーザの光軸方
向に変位した。又、デイスク中心と該デイスクを
回転駆動するモータ軸との間の偏心に伴なつてデ
イスクの記録トラツクはデイスクの半径方向（以
下ラジアル方向と記す）に変位した。これらデイ
スクの記録トラツクの上下左右の変位に対し、光
学ヘツド機構内にレーザ光の集束位置を追従せし
め、デイスクの記録トラツク上に、入射レーザス
ポツトを正確に結ばしめる機構が設けられてい
る。以下、この機構装置を光集束位置制御装置と
いう。<Prior Art> Conventionally, in an optical disk device, a disk causes surface wobbling when the disk rotates, and as a result, the recording track of the disk is displaced in the optical axis direction of an incident laser that irradiates the disk. Further, due to the eccentricity between the center of the disk and the motor shaft that rotationally drives the disk, the recording track of the disk is displaced in the radial direction of the disk (hereinafter referred to as radial direction). A mechanism is provided in the optical head mechanism to make the focusing position of the laser beam follow the vertical and horizontal displacements of the recording track of the disk, and to accurately align the incident laser spot on the recording track of the disk. Hereinafter, this mechanical device will be referred to as a light focusing position control device.
従来の既に製品化されている光デイスク装置
（記録媒体が磁性膜でない再生専用の光デイスク
装置、あるいは情報の追加記録が可能な光デイス
ク装置）では、入射レーザの光軸方向のデイスク
変位に対応する入射レーザビームの集束位置の微
調機構（以下フオーカシング制御装置と記す）と
して対物レンズを電磁気力により変動せしめる機
構装置が知られ、一方ラジアル方向のデイスク変
位に対応する入射レーザビームの集束位置の微調
機構（以下トラツキング制御装置と記す）として
入射レーザを適正な位置に反射せしめる回転ミラ
ーにより入射レーザビームの集束位置を微調整す
る機構装置が知られている。 Conventional optical disk devices that have already been commercialized (read-only optical disk devices whose recording medium is not a magnetic film, or optical disk devices that can record additional information) cannot handle disk displacement in the optical axis direction of the incident laser. As a mechanism for finely adjusting the focusing position of an incident laser beam (hereinafter referred to as a focusing control device), a mechanical device that changes an objective lens by electromagnetic force is known. A mechanical device (hereinafter referred to as a tracking control device) that finely adjusts the focusing position of an incident laser beam using a rotating mirror that reflects the incident laser beam to an appropriate position is known.
他方、対物レンズを電磁力により変動させて上
記フオーカシング制御とトラツキング制御との両
方を行なう機構装置も近年になつて提案されてい
る。この機構装置は基本的に対物レンズと一体的
に移動するコイルと固定的に設置される永久磁石
との組み合わせ（若しくは対物レンズと一体的に
移動する磁性体と固定的に設置されるコイルと永
久磁石との組み合わせ）から成り、上記コイルに
電流を流すことによつて対物レンズを上下左右方
向に変位させるものである。本発明は上述したフ
オーカシング制御とトラツキング制御とを対物レ
ンズを電磁力により変動させることによつて行な
う機構装置の改良に関するものであり、特にこの
機構装置を磁性膜を記録媒体とする光磁気デイス
ク装置に適用する場合の問題点を解決したものに
関する。 On the other hand, mechanical devices have been proposed in recent years that perform both the focusing control and tracking control by varying the objective lens using electromagnetic force. This mechanical device is basically a combination of a coil that moves integrally with the objective lens and a permanently installed permanent magnet (or a magnetic body that moves integrally with the objective lens, a fixedly installed coil, and a permanent magnet). The objective lens is moved vertically and horizontally by passing a current through the coil (in combination with a magnet). The present invention relates to an improvement in a mechanical device that performs the above-mentioned focusing control and tracking control by varying an objective lens by electromagnetic force, and particularly relates to an improvement in a mechanical device that performs the above-mentioned focusing control and tracking control by varying an objective lens using electromagnetic force. Regarding the solution of problems when applied to
＜発明が解決しようとする問題点＞
既に公知となつている、対物レンズを電磁力に
より変動させてフオーカシング制御とトラツキン
グ制御とを行なう機構装置をそのまま光磁気デイ
スク装置に適用した場合、次の問題点が発生す
る。<Problems to be Solved by the Invention> If the already known mechanical device that performs focusing control and tracking control by varying an objective lens by electromagnetic force is applied as is to a magneto-optical disk device, the following problem will occur. A point occurs.
即ち、この機構装置は永久磁石の磁界を利用す
るものである為にデイスクの近傍に漏洩磁界が発
生する。しかるに上記デイスクは磁性膜を記録媒
体としているので上記漏洩磁界が上記磁性膜に影
響を及ぼす場合は次の不都合な事になるのであ
る。 That is, since this mechanical device utilizes the magnetic field of a permanent magnet, a leakage magnetic field is generated in the vicinity of the disk. However, since the disk uses a magnetic film as a recording medium, if the leakage magnetic field affects the magnetic film, the following disadvantages occur.
（） 光磁気デイスクにレーザを照射せしめそ
れと同時に外部磁界を付与して情報を記録する
際に光集束位置制御装置からの漏洩磁界がデイ
スクに作用すれば記録情報の品質の低下を持た
らす。() When recording information by irradiating a magneto-optical disk with a laser and simultaneously applying an external magnetic field, if a leakage magnetic field from an optical focusing position control device acts on the disk, the quality of the recorded information will deteriorate.
（） 光磁気デイスクにレーザを照射し磁気光
学効果を利用して情報を再生する場合には、上
記光集束位置制御装置からの漏洩磁界がデイス
クに作用すれば記録が消去されてしまう慮れが
ある。() When reproducing information by irradiating a magneto-optical disk with a laser and utilizing the magneto-optic effect, there is a possibility that the record may be erased if the leakage magnetic field from the optical focusing position control device acts on the disk. be.
以上の様な点から光磁気デイスク装置において
は光集束位置制御装置の漏洩磁界がデイスクに作
用しないように管理する必要がある。 From the above points, it is necessary to manage the magneto-optical disk device so that the leakage magnetic field of the optical focusing position control device does not act on the disk.
＜目的＞
本発明は以上の様な諸点に鑑みなされたもの
で、光集束位置制御装置の構造に改良を加えるこ
とによつてその漏洩磁界のデイスクへの作用を減
ずることを目的とするものである。<Purpose> The present invention was made in view of the above points, and aims to reduce the effect of leakage magnetic field on the disk by improving the structure of the optical focusing position control device. be.
＜実施例＞
以下本発明に係る光集束位置制御装置の実施例
を図面を用いて詳細に説明する。<Example> Hereinafter, an example of the optical focusing position control device according to the present invention will be described in detail using the drawings.
第１図は光磁気デイスク装置の構造を示す構成
説明図である。１はレーザ光２を発射するレーザ
光源であり、３はミラー、４はレーザ光２をデイ
スク記録媒体面に集束せしめる対物レンズであ
る。５は対物レンズ４を上下左右に駆動して光集
束位置をデイスク記録媒体の記録トラツク上に造
従制御させる光集束位置制御装置であり、６は以
上の光学系を収納する光学ヘツドである。７は情
報の記録、消去時にデイスク記録媒体面に磁界を
付与する記録、消去用コイルである。８はデイス
ク記録媒体８′を内蔵する光磁気デイスク、９は
該光磁気デイスクを回転駆動するモーターであ
る。ここで上記光集束位置制御装置５によるフオ
ーカシング制御、即ち入射レーザの光軸方向のデ
イスク変位に対する入射レーザビームの集束位置
の微調整は、対物レンズ４を光磁気デイスク８の
厚み方向に移動させることで行なわれ、一方上記
光集束位置制御装置５によるトラツキング制御即
ちラジアル方向のデイスク変位に対する入射レー
ザビームの集束位置の微調整は対物レンズ４を光
磁気デイスク８のラジアル方向に移動させること
で行なわれる。 FIG. 1 is an explanatory diagram showing the structure of a magneto-optical disk device. 1 is a laser light source that emits a laser beam 2; 3 is a mirror; and 4 is an objective lens that focuses the laser beam 2 onto the disk recording medium surface. 5 is a light focusing position control device that drives the objective lens 4 vertically and horizontally to control the light focusing position to follow the recording track of the disk recording medium, and 6 is an optical head that houses the above optical system. Reference numeral 7 denotes a recording/erasing coil that applies a magnetic field to the surface of the disk recording medium when recording or erasing information. 8 is a magneto-optical disk containing a disk recording medium 8', and 9 is a motor for rotationally driving the magneto-optical disk. Here, focusing control by the optical focusing position control device 5, that is, fine adjustment of the focusing position of the incident laser beam with respect to disk displacement in the optical axis direction of the incident laser, is performed by moving the objective lens 4 in the thickness direction of the magneto-optical disk 8. On the other hand, tracking control by the optical focusing position control device 5, that is, fine adjustment of the focusing position of the incident laser beam with respect to disk displacement in the radial direction, is performed by moving the objective lens 4 in the radial direction of the magneto-optical disk 8. .
第２図は上記光集束位置制御装置５の構造を詳
細に示した側面断面図である。 FIG. 2 is a side sectional view showing the structure of the light focusing position control device 5 in detail.
まず、トラツキング制御装置について説明す
る。１０は対物レンズ４を収納支持する対物レン
ズ鏡筒であり、該レンズ鏡筒１０は中間支持体１
１に対しトラツキング方向可動平行バネ１２によ
つて左右方向に可動に設置される。１３はトラツ
キング用永久磁石、１４はトラツキング用ヨーク
プレート、１５はトラツキング用ヨークであり、
これらは閉磁路を形成し、中間支持体１１に固定
的に取り付けられる。上記トラツキング用ヨーク
プレート１４とトラツキング用ヨーク１５との間
にはトラツキング用磁気空隙１６が設けられる。
１７はトラツキング駆動コイルであり、該トラツ
キング駆動コイル１７は上記トラツキング用磁気
空隙１６を横切るように配置されると共にレンズ
鏡筒１０に固着される。上記トラツキング駆動コ
イル１７にトラツキング制御電流を流せば、該コ
イル１７に磁界が発生し、上記トラツキング用永
久磁石１３の発生する磁界との相互作用によつて
トラツキング駆動コイル１７、レンズ鏡筒１０、
対物レンズ４及びカウンタバランス１８はデイス
ク半径方向に変位する。尚、上記カウタバランス
１８はトラツキング可動部の重心位置にトラツキ
ング駆動力が作用するようにレンズ鏡筒１０の下
部に固定される部材である。以上の構成によつて
トラツキング制御装置が形成される。 First, the tracking control device will be explained. Reference numeral 10 denotes an objective lens barrel that accommodates and supports the objective lens 4, and the lens barrel 10 is connected to the intermediate support 1.
1, it is installed so as to be movable in the left-right direction by a parallel spring 12 that is movable in the tracking direction. 13 is a permanent magnet for tracking, 14 is a yoke plate for tracking, 15 is a yoke for tracking,
These form a closed magnetic path and are fixedly attached to the intermediate support 11. A tracking magnetic gap 16 is provided between the tracking yoke plate 14 and the tracking yoke 15.
Reference numeral 17 denotes a tracking drive coil, and the tracking drive coil 17 is arranged to cross the tracking magnetic gap 16 and is fixed to the lens barrel 10. When a tracking control current is passed through the tracking drive coil 17, a magnetic field is generated in the coil 17, and due to interaction with the magnetic field generated by the tracking permanent magnet 13, the tracking drive coil 17, lens barrel 10,
The objective lens 4 and the counterbalance 18 are displaced in the disk radial direction. The counter balance 18 is a member fixed to the lower part of the lens barrel 10 so that the tracking driving force acts on the center of gravity of the tracking movable section. A tracking control device is formed by the above configuration.
次にフオーカス制御装置について説明する。１
９はフオーカス用永久磁石、２０はフオーカス用
ヨークプレート、２１はフオーカス用ヨークであ
りこれらは閉磁路を形成する。又これらは光集束
位置制御装置全体の固定支持体２５に固定的に設
置される。上記フオーカス用ヨークプレート２０
とフオーカス用ヨーク２１との間にはフオーカス
用磁気空隙２２が設けられる。２３はフオーカス
駆動コイルであり、該フオーカス駆動コイル２３
は上記フオーカス用磁気空隙２２を横切るように
配置されると共に中間支持体１１に固着される。
この中間支持体１１は固定支持体２５に一方を固
着された光軸方向可動平行バネ２４によつて上下
方向に可動に設置されているので、上記フオーカ
ス駆動コイル２３にフオーカス制御電流を流せば
上記コイル２３に磁界が発生し、上記フオーカス
用永久磁石１９の発生する磁界との相互作用によ
つて中間支持体１１によつて支えられたトラツキ
ング制御装置をフオーカス方向に変位せしめる。
以上の構成によつてフオーカス制御装置が形成さ
れる。 Next, the focus control device will be explained. 1
9 is a focus permanent magnet, 20 is a focus yoke plate, and 21 is a focus yoke, which form a closed magnetic path. Also, these are fixedly installed on a fixed support 25 of the entire light focusing position control device. Yoke plate 20 for the above focus
A focus magnetic gap 22 is provided between the focus yoke 21 and the focus yoke 21 . 23 is a focus drive coil;
is arranged across the focus magnetic gap 22 and is fixed to the intermediate support 11.
The intermediate support 11 is installed movably in the vertical direction by a parallel spring 24 that is movable in the optical axis direction, one end of which is fixed to the fixed support 25. Therefore, when a focus control current is applied to the focus drive coil 23, the A magnetic field is generated in the coil 23, and by interaction with the magnetic field generated by the focus permanent magnet 19, the tracking control device supported by the intermediate support 11 is displaced in the focus direction.
A focus control device is formed by the above configuration.
以上の構成の光集束位置制御装置においては、
その漏洩磁界が光磁気デイスクの記録媒体８′に
作用しないようにする為の多くの工夫が施されて
いる。以下にその工夫点について詳細に説明す
る。 In the light focusing position control device with the above configuration,
Many measures have been taken to prevent the leakage magnetic field from acting on the recording medium 8' of the magneto-optical disk. The points of improvement will be explained in detail below.
（） フオーカシング制御装置における工夫
点。() Points of improvement in the focusing control device.
第３図ａに本発明に係る工夫を施したフオー
カシング制御装置の側面断面図を示し、同図ｂ
に工夫を施さないフオーカシング制御装置の側
面断面図を示す。記号Ｎ，Ｓは夫々Ｎ極，Ｓ極
を示す。同図ａに示す様に本発明に係る工夫を
施したフオーカシング制御装置ではフオーカシ
ング用磁気空隙２２が光磁気デイスクに近い側
に形成されている。この構造によれば光磁気デ
イスクの記録媒体８′に作用する漏洩磁界を小
さくできる。一方同図ｂの如くフオーカシング
用磁気空隙２２′を光磁気デイスクに遠い側に
形成した構造のものでは光磁気デイスクの記録
媒体８′面に作用する漏洩磁界が大きい。同図
ａ，ｂの矢印はその始点の位置の漏洩磁界の強
さを矢印の長さで、漏洩磁界の方向を矢印の方
向で示している。 Fig. 3a shows a side cross-sectional view of a focusing control device that has been devised according to the present invention, and Fig. 3b
FIG. 2 shows a side cross-sectional view of a focusing control device without any modifications. Symbols N and S indicate N and S poles, respectively. As shown in FIG. 5A, in the focusing control device according to the present invention, a focusing magnetic gap 22 is formed on the side closer to the magneto-optical disk. With this structure, the leakage magnetic field acting on the recording medium 8' of the magneto-optical disk can be reduced. On the other hand, in a structure in which the focusing magnetic gap 22' is formed on the far side of the magneto-optical disk, as shown in FIG. The arrows in a and b of the figure indicate the strength of the leakage magnetic field at the starting point position by the length of the arrow, and the direction of the leakage magnetic field by the direction of the arrow.
（） トラツキング制御装置における工夫。() Improvements in tracking control equipment.
第４図ａに本発明に係係る工夫を施したトラ
ツキング制御装置の側面断面図を示し、同図ｂ
及び同図ｃに工夫を施さないトラツキング制御
装置の側面トラツキングを示す。同図ａに示す
様に本発明に係る工夫を施したトラツキング制
御装置ではトラツキング用永久磁石１３が閉磁
路の中央に配置されている。この構造によれば
光磁気デイスクの記録媒体８′に作用する漏洩
磁界を小さくできる。 Fig. 4a shows a side cross-sectional view of a tracking control device that has been devised according to the present invention, and Fig. 4b
FIG. 3c shows side tracking of the tracking control device without any modification. As shown in FIG. 5A, in the tracking control device with the invention according to the present invention, a tracking permanent magnet 13 is arranged at the center of the closed magnetic path. With this structure, the leakage magnetic field acting on the recording medium 8' of the magneto-optical disk can be reduced.
一方同図ｂの如くトラツキング用永久磁石１
３′を閉磁路の周囲に配置した構造のもの、或
いは同図ｃの如く磁気回路のデイスクに面する
方向が開磁路になつている構造のものではトラ
ツキング用磁気空隙１６′，１６″において働く
磁界の大きさが同図ａのトラツキング用磁気空
隙１６と同等になるように設計した時光磁気デ
イスクの記録媒体８′面に作用する漏洩磁界は
非常に大きい。 On the other hand, as shown in the same figure b, a permanent magnet 1 for tracking
3' is arranged around a closed magnetic path, or in a structure where the direction facing the disk of the magnetic circuit is an open magnetic path as shown in Figure c, the tracking magnetic gaps 16' and 16'' When designed so that the magnitude of the working magnetic field is equivalent to that of the tracking magnetic gap 16 shown in FIG.
（） トラツキング制御装置の固着位置におけ
る工夫点。() Points to consider when fixing the tracking control device.
トラツキング制御装置において、トラツキン
グ用磁気空隙内に働く磁界の大きさを一定に設
計する場合、トラツキング用磁気空隙の間隔が
大きい程漏洩磁界が大きくなるので、上記トラ
ツキング用磁気空隙の間隔は出来るだけ狭い方
がよい。しかし対物レンズはは上下右の二軸方
向に移動させなければならないことから、トラ
ツキング制御用磁気回路及びフオーカシング制
御用磁気回路を固定支持体に固着した場合には
例えばトラツキングコイルを上記トラツキング
用磁気空隙内において二軸方向に動かさねばな
らない為に上記磁気空隙の間隔は広くせざるを
得ない。しかるに上記磁気空隙の間隔を広くす
ることは上述した理由で不利である。 When designing a tracking control device so that the magnitude of the magnetic field acting in the tracking magnetic gaps is constant, the larger the spacing between the tracking magnetic gaps, the larger the leakage magnetic field, so the spacing between the tracking magnetic gaps should be as narrow as possible. It's better. However, since the objective lens must be moved in two axial directions, up and down and to the right, if the tracking control magnetic circuit and the focusing control magnetic circuit are fixed to a fixed support, for example, the tracking coil must be moved in the above-mentioned tracking magnetic field. Since the magnetic gap must be moved in two axial directions within the gap, the distance between the magnetic gaps must be widened. However, widening the spacing between the magnetic gaps is disadvantageous for the reasons mentioned above.
この点から、本発明に係る第２図の光集束位
置制御装置ではトラツキング制御用磁気回路が
中間支持体１１に固着されている。この構造に
よればトラツキング駆動コイル１７は上記トラ
ツキング用磁気空隙１６内を左右方向にのみ移
動するものであるから、上記磁気空隙１６を必
要最小限に狭くでき、従つて漏洩磁界を小さく
できるものである。 From this point of view, in the optical focusing position control device of FIG. 2 according to the present invention, a magnetic circuit for tracking control is fixed to the intermediate support 11. According to this structure, the tracking drive coil 17 moves only in the horizontal direction within the tracking magnetic gap 16, so the magnetic gap 16 can be narrowed to the minimum necessary, and the leakage magnetic field can therefore be reduced. be.
以上詳細に説明した本発明に係係る光集束位置
制御装置において、フオーカシング制御を行なう
際にフオーカス目標位置に対する対物レンズの変
位の運動位相遅れを180゜より小さくする事が大切
である。そしてこ運動位相遅れを小さく確保する
為には対物レンズ鏡筒１０の上下方向の運動特性
における２次共振周波数が8KHz以上であればよ
いことが本発明者の研究によつて判明している。 In the optical focusing position control device according to the present invention described in detail above, it is important to make the motion phase delay of the displacement of the objective lens with respect to the focus target position smaller than 180° when performing focusing control. The inventor's research has revealed that in order to keep this motion phase delay small, the secondary resonance frequency in the vertical motion characteristics of the objective lens barrel 10 should be 8 KHz or more.
又、上記２次共振周波数を8KHz以上に設定す
る為にはトラツキング方向平行バネ１２の厚みを
20〜50μm、巾を厚みの50〜100倍程度に設計する
ことによつて、位相進み補償回路を付加すれば達
成できることが確認されている。尚トラツキング
方向の可動部重量は0.5〜10ｇ程度である。又、
上記トラツキング方向平行バネ１２を厚みが30〜
50μmのベリリウム銅合金にて作成すれば更に良
好であることも確認されている。 In addition, in order to set the secondary resonance frequency above 8KHz, the thickness of the parallel spring 12 in the tracking direction must be adjusted.
It has been confirmed that this can be achieved by designing the width to be 20 to 50 μm, approximately 50 to 100 times the thickness, and adding a phase lead compensation circuit. The weight of the movable part in the tracking direction is about 0.5 to 10 g. or,
The tracking direction parallel spring 12 has a thickness of 30~
It has also been confirmed that it is even better if made of 50 μm beryllium copper alloy.
＜効果＞
以上詳細に説明した本発明によれば、対物レン
ズを光軸に対して傾けずに、上下左右の二軸方向
に駆動することができるので装置全体の大きさを
コンパクト化することができ、しかも光磁気デイ
スクに対する漏洩磁界の作用を減少せしめ、光磁
気記録情報の品質及び信頼性の向上を促進し得る
ものである。<Effects> According to the present invention described in detail above, the objective lens can be driven in two axes (up, down, left and right) without being tilted with respect to the optical axis, so the overall size of the device can be made more compact. Moreover, the effect of the leakage magnetic field on the magneto-optical disk can be reduced, and the quality and reliability of the magneto-optical recorded information can be improved.
第１図は光磁気デイスク装置の構造を示す構成
説明図、第２図は本発明に係る光集束位置制御装
置の構造を示す側面断面図、第３図はフオーカシ
ング制御装置の側面断面図、第４図はトラツキン
グ制御装置の側面断面図である。
図中、１：レーザ光源、２：レーザ光、３：ミ
ラー、４：対物レンズ、５：光集束位置制御装
置、６：光学ヘツド、７：記録，消去用コイル、
８：光磁気デイスク、９：モーター、１０：レン
ズ鏡筒、１１：中間支持体、１２：トラツキング
方向可動平行バネ、１３：トラツキング用永久磁
石、１４：トラツキング用ヨークプレート、１
５：トラツキング用ヨーク、１６：トラツキング
用磁気空隙、１７：トラツキング駆動コイル、１
８：カウンタバランス、１９：フオーカス用永久
磁石、２０：フオーカス用ヨークプレート、２
１：フオーカス用ヨーク、２２：フオーカス用磁
気空隙、２３：フオーカス駆動コイル、２４：光
軸方向可動平行バネ、２５：固定支持体。
FIG. 1 is a configuration explanatory diagram showing the structure of a magneto-optical disk device, FIG. 2 is a side sectional view showing the structure of the optical focusing position control device according to the present invention, and FIG. 3 is a side sectional view of the focusing control device. FIG. 4 is a side sectional view of the tracking control device. In the figure, 1: laser light source, 2: laser light, 3: mirror, 4: objective lens, 5: light focusing position control device, 6: optical head, 7: recording/erasing coil,
8: magneto-optical disk, 9: motor, 10: lens barrel, 11: intermediate support, 12: parallel spring movable in tracking direction, 13: permanent magnet for tracking, 14: yoke plate for tracking, 1
5: Tracking yoke, 16: Tracking magnetic gap, 17: Tracking drive coil, 1
8: Counter balance, 19: Permanent magnet for focus, 20: Yoke plate for focus, 2
1: Focus yoke, 22: Focus magnetic gap, 23: Focus drive coil, 24: Parallel spring movable in the optical axis direction, 25: Fixed support.
Claims (1)
カシング制御のために対物レンズを光磁気デイス
クの厚み方向に駆動するための電磁手段とトラツ
キング制御のために対物レンズを光磁気デイスク
のラジアル方向に駆動するための電磁手段とを備
えた光集束位置制御装置において、 フオーカシング制御のために対物レンズを光磁
気デイスクの厚み方向に駆動するための電磁手段
を構成する磁気回路の磁気空隙を前記光磁気デイ
スクに近い側に設けるとともに、 トラツキング制御のために対物レンズを光磁気
デイスクのラジアル方向に駆動するための電磁手
段を構成する磁気回路が永久磁石を該磁気回路の
閉磁路の中央に有することを特徴とする光集束位
置制御装置。 ２ 前記トラツキング制御のために対物レンズを
光磁気デイスクのラジアル方向に駆動するための
電磁手段は対物レンズを備えた中間支持体に取り
付けられ、かつ、前記フオーカシング制御のため
に対物レンズを光磁気デイスクの厚み方向に駆動
するための電磁手段は前記中間支持体を介して前
記対物レンズを光磁気デイスクの厚み方向に駆動
することを特徴とする特許請求の範囲第１項記載
の光集束位置制御装置。[Claims] 1. Electromagnetic means for driving an objective lens in the thickness direction of the magneto-optical disk for focusing control and an electromagnetic means for driving the objective lens in the thickness direction of the magneto-optical disk for tracking control, for use in a magneto-optical disk device. In an optical focusing position control device equipped with electromagnetic means for driving in the radial direction, a magnetic air gap of a magnetic circuit constituting the electromagnetic means for driving the objective lens in the thickness direction of the magneto-optical disk for focusing control. A magnetic circuit, which is provided near the magneto-optical disk and constitutes an electromagnetic means for driving the objective lens in the radial direction of the magneto-optical disk for tracking control, places a permanent magnet in the center of a closed magnetic path of the magnetic circuit. A light focusing position control device comprising: 2. The electromagnetic means for driving the objective lens in the radial direction of the magneto-optical disk for the tracking control is attached to an intermediate support provided with the objective lens, and the electromagnetic means for driving the objective lens in the radial direction of the magneto-optical disk for the tracking control, and The optical focusing position control device according to claim 1, wherein the electromagnetic means for driving the objective lens in the thickness direction of the magneto-optical disk via the intermediate support body. .
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6877183A JPS59193552A (en) | 1983-04-18 | 1983-04-18 | Controller for light focusing position |
| US06/529,849 US4660190A (en) | 1983-01-25 | 1983-09-06 | Optical focus position control in optical disc apparatus |
| CA000451907A CA1219073A (en) | 1983-04-18 | 1984-04-12 | Optical focus position control in an optical memory system |
| US06/600,374 US4658390A (en) | 1983-04-18 | 1984-04-16 | Optical focus position control in an optical memory system |
| EP84302661A EP0122816B1 (en) | 1983-04-18 | 1984-04-18 | Optical focus position control in an optical memory system |
| DE8484302661T DE3482725D1 (en) | 1983-04-18 | 1984-04-18 | SETTING THE OPTICAL FOCUSING IN AN OPTICAL STORAGE PROCESS. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6877183A JPS59193552A (en) | 1983-04-18 | 1983-04-18 | Controller for light focusing position |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59193552A JPS59193552A (en) | 1984-11-02 |
| JPH0516091B2 true JPH0516091B2 (en) | 1993-03-03 |
Family
ID=13383325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6877183A Granted JPS59193552A (en) | 1983-01-25 | 1983-04-18 | Controller for light focusing position |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS59193552A (en) |
| CA (1) | CA1219073A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS634433A (en) * | 1986-06-24 | 1988-01-09 | Sharp Corp | Objective lens driver |
| JPH02270150A (en) * | 1989-04-12 | 1990-11-05 | Olympus Optical Co Ltd | Optical information recording and reproducing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56117338A (en) * | 1980-02-16 | 1981-09-14 | Olympus Optical Co Ltd | Driving device for objective lens |
| JPS5719539B2 (en) * | 1979-11-30 | 1982-04-23 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6217Y2 (en) * | 1980-07-04 | 1987-01-06 |
-
1983
- 1983-04-18 JP JP6877183A patent/JPS59193552A/en active Granted
-
1984
- 1984-04-12 CA CA000451907A patent/CA1219073A/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5719539B2 (en) * | 1979-11-30 | 1982-04-23 | ||
| JPS56117338A (en) * | 1980-02-16 | 1981-09-14 | Olympus Optical Co Ltd | Driving device for objective lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59193552A (en) | 1984-11-02 |
| CA1219073A (en) | 1987-03-10 |
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