JPS62139132A - Optical system driving device - Google Patents
Optical system driving deviceInfo
- Publication number
- JPS62139132A JPS62139132A JP27804585A JP27804585A JPS62139132A JP S62139132 A JPS62139132 A JP S62139132A JP 27804585 A JP27804585 A JP 27804585A JP 27804585 A JP27804585 A JP 27804585A JP S62139132 A JPS62139132 A JP S62139132A
- Authority
- JP
- Japan
- Prior art keywords
- optical system
- lens holder
- coil
- holder
- winding
- 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.)
- Pending
Links
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光学系駆動装置に関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to an optical system driving device.
一般に情報記録媒体としては、磁気テープ、磁気ディス
クタイツのものが広く普及しているが、最近さらに高密
度の情報書き込みが可能な光学式書き込み再生方式の媒
体が注目されている。この光学式情報書き込み再生装置
では、レーザー光で媒体に情報を書き込み再生するため
レーザー光の媒体面上のスポットを非常に小さくするこ
とにより、高密度記録が可能となる。In general, magnetic tapes and magnetic disk tights are widely used as information recording media, but recently, optical writing/reproducing media that are capable of writing information at a higher density have been attracting attention. In this optical information writing and reproducing device, information is written and reproduced on a medium using a laser beam, so that high-density recording is possible by making the spot of the laser beam on the medium surface very small.
このような光学的情報記録再生装置の光学ヘッドに使用
される光学系駆動装置は、トラッキング、フォーカシン
グのために対物レンズを左右方向（回転方向）と上下方
向（軸線方向）へ正確に駆動することが要求される。The optical system drive device used in the optical head of such an optical information recording/reproducing device is capable of accurately driving the objective lens in the horizontal direction (rotational direction) and vertical direction (axial direction) for tracking and focusing. is required.
そして従来、この種の光学系駆動装置としては光学系を
保持した光学系保持体と、該光学系保持体を基台に対し
て光学系の光軸方向又は光軸に直交する方向に移動可能
に支持する手段と、前記光学系保持体又は基台のいずれ
か一方に設けられたコイルと、前記コイルを横切るよう
に磁界を形成する磁気回路とを有するものが利用されて
いる。Conventionally, this type of optical system driving device includes an optical system holder that holds an optical system, and a movable optical system holder that is movable relative to a base in the optical axis direction of the optical system or in a direction perpendicular to the optical axis. A device having a means for supporting the optical system, a coil provided on either the optical system holder or the base, and a magnetic circuit that forms a magnetic field across the coil is used.
ところで支持軸を中心とする回転方向へ対物レンズ保持
体を駆動する磁気回路としては、支持軸の軸線方向に平
行な平面もしくは曲面をもつレンズ保持体の一部にその
面に平行方向に巻線されたコイルを設け、それと対向し
た基台側に永久磁石をコイルと平行な面を取る様取り付
けたものが用いられそれらの間に発生する磁気的相互作
用によｐ駆動が行なわれていた。By the way, the magnetic circuit that drives the objective lens holder in the direction of rotation around the support shaft is a part of the lens holder that has a flat or curved surface parallel to the axial direction of the support shaft, and is wound in a direction parallel to that surface. A permanent magnet was installed on the base side facing the coil so as to have a surface parallel to the coil, and p-drive was performed by the magnetic interaction generated between them.
そして、この様な構成の磁気回路において、従来の駆動
用コイルは第４図に示す様な矩形の形状のものが使用さ
れていた。In a magnetic circuit having such a configuration, a conventional drive coil having a rectangular shape as shown in FIG. 4 has been used.
しかしながら、上述従来のトラッキングコイル２は直線
部分４．６を形成するために生ずる角部の曲率半径Ｒ′
が非常に小さくなるため、該コイルの８７部の正確な整
列巻きが困難になるという問題点を有している。However, in the conventional tracking coil 2 described above, the radius of curvature R' of the corner that occurs to form the straight portion 4.6 is
is very small, which makes it difficult to wind the 87 portions of the coil in precise alignment.
又、コイル２の整列巻きが不正確であると、該コイルに
電流を流して発生する磁界に乱れが生じ、そのことによ
って正確な対物レンズの駆動ができないという問題点を
有する。Furthermore, if the winding of the coil 2 is inaccurate, the magnetic field generated by passing a current through the coil will be disturbed, resulting in the problem that the objective lens cannot be driven accurately.
本発明は上述従来技術の問題点に鑑みなされたものであ
り、その目的は曲率半径の比較的大きな巻き線のコイル
によって対物レンズ保持体を駆動することにより、正確
かつスムーズな対物レンズの駆動を可能とする、光学系
駆動装置を提供することにある。The present invention was made in view of the problems of the prior art described above, and its purpose is to accurately and smoothly drive an objective lens by driving an objective lens holder using a winding coil having a relatively large radius of curvature. The object of the present invention is to provide an optical system driving device that makes it possible.
上記目的は、本発明によれば光学系を保持した光学系保
持体と、該光学系保持体を基台に対して光学系の光軸方
向又は光軸に直交する方向に移動可能に支持する手段と
、前記光学系保持体又は基台のいずれか一方に設けられ
たコイルと、前記コイルを横切るように磁界を形成する
磁気回路とから成る光学系駆動装置において、前記コイ
ルが前記光軸を含む面に平行な面内で円形状に巻き線さ
れて成ることを特徴とする光学系駆動装置によって達成
される。According to the present invention, the above object is to provide an optical system holder holding an optical system, and to support the optical system holder so as to be movable in the optical axis direction of the optical system or in the direction orthogonal to the optical axis with respect to the base. an optical system drive device comprising: a coil provided on either the optical system holder or the base; and a magnetic circuit that forms a magnetic field across the coil; This is achieved by an optical system driving device characterized in that the wire is wound in a circular shape within a plane parallel to the containing plane.
以下本発明に係る光学系駆動装置の一実施例を、図面に
基づいて具体的かつ詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical system driving device according to the present invention will be described in detail below with reference to the drawings.
第１図は本発明に係る光学系駆動装置の構成を説明する
ための分解斜視図である。FIG. 1 is an exploded perspective view for explaining the configuration of an optical system driving device according to the present invention.
図に示す様に、本発明に係る光学系保持体［１２は矩形
の形状の基台１４を有する。また、基台１４の図におけ
る上面部の対向する短い方の辺の１組には、図示する様
に矩形状の永久磁石１６゜１８が固設されている。更に
、基台１４の長い方の対向する１組の辺の上面部には、
円弧形状の永久磁石２０．２２が固設されている。As shown in the figure, the optical system holder [12 according to the present invention has a rectangular base 14. Furthermore, rectangular permanent magnets 16.degree. 18 are fixedly attached to one set of opposing short sides of the top surface of the base 14 as shown in the drawing. Furthermore, on the upper surface of a pair of long opposing sides of the base 14,
Arc-shaped permanent magnets 20, 22 are fixedly installed.
まだ、基台１４のほぼ中心部には、該基台１４の上面に
対し直角方向に突設固定された円筒形状を有する支持軸
２４が設けられ°Ｃいる。更に、該支持軸２４の永久磁
石２０．２２が設けられている方向の近傍には、支持軸
２４よシも小さいピン２６．２８が突設固定されてｂる
。また、基台１４にはレーデ−光を通すための上下方向
の貫通孔３０が設けられている。A support shaft 24 having a cylindrical shape is provided substantially at the center of the base 14 and is fixed and protrudes perpendicularly to the upper surface of the base 14. Furthermore, pins 26, 28, which are smaller than the support shaft 24, are protrudingly fixed near the direction in which the permanent magnets 20, 22 of the support shaft 24 are provided. Further, the base 14 is provided with a vertical through hole 30 for passing radar light.
また、本発明に係る光学系駆動装置１２は前述の支持軸
２４によって貫通され、且つピン２６゜２８によって支
持固定される中立点保持体３２を有する。該中立点保持
体３２は、その中心部に有する穴３４に支持軸２４が貫
通させられ、紋穴３４をはさんで両側に有する穴３６＊
３８にピン２６．２８が嵌合させられて、基台１４に支
持固定される。また、中立点保持体３２は図示する様に
、穴３６．３８が設けられている方向の両側に渦巻きバ
ネ４０．４２を有する。該渦巻きノマネ４０．４２の中
心部にはピン係止部４４，４６が形成されており、該ピ
ン係止部４４．４６には後述するレンズ保持体４８の下
部に固定されているピン５０．５２が接続係止される。Further, the optical system driving device 12 according to the present invention has a neutral point holder 32 that is penetrated by the above-mentioned support shaft 24 and is supported and fixed by the pin 26°28. The neutral point holder 32 has a hole 34 in the center thereof, through which the support shaft 24 passes, and holes 36* on both sides with the crest hole 34 in between.
The pins 26 and 28 are fitted into the pins 38 to be supported and fixed to the base 14. The neutral point holder 32 also has spiral springs 40, 42 on both sides of the direction in which the holes 36, 38 are provided, as shown. Pin locking portions 44, 46 are formed at the center of the spiral nozzle 40.42, and a pin 50.46 fixed to the lower portion of a lens holder 48, which will be described later, is attached to the pin locking portions 44.46. 52 is connected and locked.
これによってレンズ保持体４８は中立位置に復元する様
に保持される。Thereby, the lens holder 48 is held so as to be restored to the neutral position.
本発明に係る光学系駆動装置１２は前述の如く。The optical system driving device 12 according to the present invention is as described above.
中立点保持体３２により中立位置に復元する様に保持さ
れるレンズ保持体４８を有する。該レンズ保持体４８の
中心部には軸受ｌが配設されている。It has a lens holder 48 which is held by the neutral point holder 32 so as to be restored to the neutral position. A bearing l is disposed at the center of the lens holder 48.
該軸受ｌには基台１４に設けられた支持軸２４力監貫通
される。かくして、レンズ保持体４８は、咳支持軸２４
のまわりに回転可能でかつ支持軸２４の軸方向に摺動可
能とされる。A support shaft 24 provided on the base 14 passes through the bearing l. Thus, the lens holder 48 supports the cough support shaft 24
The support shaft 24 is rotatable around the support shaft 24 and slidable in the axial direction of the support shaft 24.
また第１図に示すレンズ保持体４８には円形状に導線が
巻かれたトラッキングコイル５４及び５６が設けられて
おり、該コイル５４．５６に電流を流して発生した磁界
と前述の基台１４側に設けられた永久磁石１６．１８と
の相互作用により、レンズ保持体４８を支持軸２４のま
わりに回転駆動させることができる。更に、５８及び６
０はコイルであり、これに電流を流して発生した磁界と
基台１４側に設けられた永久磁石２０．２２との相互作
用により、レンズ保持体４Ｂを支持軸２４の軸方向へ駆
動させることができる。Further, the lens holder 48 shown in FIG. 1 is provided with tracking coils 54 and 56 in which conductive wires are wound in a circular shape. By interaction with the permanent magnets 16,18 provided on the sides, the lens holder 48 can be driven in rotation about the support axis 24. Furthermore, 58 and 6
0 is a coil, and the lens holder 4B is driven in the axial direction of the support shaft 24 by the interaction between the magnetic field generated by passing a current through this coil and the permanent magnets 20 and 22 provided on the base 14 side. I can do it.
まだ第１図に示すレンズ保持体４８には、レーデ−光を
記録媒体面上へ集光させるだめの対物レンズ６２が設け
られている。該対物レンズ６２は前述の基台１４の貫通
孔３０に対応する位置に設けられている。The lens holder 48 shown in FIG. 1 is still provided with an objective lens 62 for focusing the radar light onto the surface of the recording medium. The objective lens 62 is provided at a position corresponding to the through hole 30 of the base 14 described above.
また上述の説明の如く、本発明に係るレンズ保持体４８
は、該レンズ保持体４８を支持軸２４のまわりに回転駆
動させるべく設けられた導線を円形状に巻いて構成され
たトラッキングコイル５４及び５６を有する。Further, as described above, the lens holder 48 according to the present invention
has tracking coils 54 and 56 formed by winding a conductive wire in a circular shape to rotate the lens holder 48 around the support shaft 24.
このトラッキングコイル５４．５６について第２図及び
第３図を用いて、更に詳しく説明する。The tracking coils 54 and 56 will be explained in more detail with reference to FIGS. 2 and 3.
尚、第２図は本発明に係るトラッキングコイル５４．５
６の正面図であり、第３図はそのトラッキングコイル５
４．５６に電流を流した際の、該コイルに発生する駆動
力をベクトルによって表わした図である。Incidentally, FIG. 2 shows a tracking coil 54.5 according to the present invention.
6, and FIG. 3 is a front view of the tracking coil 5.
4.56 is a diagram showing the driving force generated in the coil by a vector when a current is passed through the coil.
第１図に示す様に、本発明に係るレンズ保持体４８は、
該保持体４８の対向する側部に、第２図に示す様な導線
が円形状に巻かれたトラッキングコイル５４．５６を有
する。該トラッキングコイル５４．５６の曲率半径Ｒは
、第４図の従来例に示したコイル２の角部の曲率半径Ｒ
′よシ大きくしかも全体として円形状であるため、導線
の巻き線時の巻き乱れ及び該導線の折れ等の発生が少な
く、正確な整列巻きが可能である。As shown in FIG. 1, the lens holder 48 according to the present invention is
On opposite sides of the holder 48 are tracking coils 54, 56 each having a conductive wire wound in a circular shape as shown in FIG. The radius of curvature R of the tracking coils 54 and 56 is the radius of curvature R of the corner of the coil 2 shown in the conventional example in FIG.
Since the conductor wire is larger than the conductor wire and has a circular shape as a whole, there is less occurrence of disordered winding or bending of the conductor wire when winding the conductor wire, and accurate aligned winding is possible.
次に、上記のトラッキングコイル５４．５６に電流を流
した場合の作用を第３図を用いて説明す為。第３図に示
す点線はコイル５４．５６の縦方向の中心線７０を表わ
す。以下の説明はコイル５４．５６の中心ＩＮ！１１７
０より向かって左側の部分を駆動力発生に利用する場合
の説明である。尚。Next, the effect when a current is passed through the tracking coils 54 and 56 described above will be explained using FIG. 3. The dotted line shown in FIG. 3 represents the longitudinal centerline 70 of the coils 54,56. The following explanation is the center IN of coil 54.56! 117
This is an explanation of the case where the portion on the left side of 0 is used for generating driving force. still.
第３図には磁力線の向き７２に示す方向（第３図の紙面
に対し直角方向に表側から裏側に突き貫ける方向）の磁
力線が、上記コイルの中心線７０よｐ左側の部分にて永
久磁石１６．１８によって形成されているとする。In FIG. 3, the magnetic lines of force in the direction 72 (direction that penetrates from the front side to the back side in a direction perpendicular to the paper surface of FIG. 3) are attached to the permanent magnet at a portion to the left of the center line 70 of the coil. 16.18.
この状態の中でトラッキングコイル５４．５６に電流を
流すと中心線７０より左側のコイル５４゜５６には、前
述の磁力線の向き７２による磁界と電流によって発生し
たコイル５４．５６の磁界との相互作用により、図示す
る様なコイル５４゜５６の中心から放射状の方向の力Ｆ
ｘが発生する。In this state, when a current is applied to the tracking coils 54.56, the coils 54.56 on the left side of the center line 70 receive a mutual magnetic field due to the direction 72 of the magnetic lines of force and the magnetic field of the coils 54.56 generated by the current. As a result, a force F in a radial direction from the center of the coil 54, 56 as shown in the figure is generated.
x occurs.
ここで、トラッキング方向へのレンズ保持体の駆動に必
要な力成分の方向を図に示すベクトルＸとすると、コイ
ル５４．５６に放射状に発生し死力ＦｘのベクトルＸ方
向の成分であるＰｘをコイル５４．５６の磁場の存在す
る範囲で積算したものが、トラッキング駆動力となる。Here, if the direction of the force component necessary to drive the lens holder in the tracking direction is the vector The tracking driving force is accumulated over the range where the magnetic fields of the coils 54 and 56 exist.
そして、この駆動力によってトラッキングコイル５４．
５６が設けられたレンズ保持体は支持軸のまわりに回転
駆動され、トラッキングを行う。This driving force causes the tracking coil 54.
The lens holder provided with 56 is rotationally driven around the support shaft to perform tracking.
以上詳細かつ具体的に説明した様に、本発明においては
レンズ保持体を駆動するコイルの形状を円形のものとす
ることにより、曲率半径Ｒが一定になるので、該コイル
の導線の正確な整列巻きが可能となり該コイルの発生す
る磁界を乱れのないものとすることができる。よって、
レンズ保持体の駆動を正確なものとすることができる。As explained above in detail and specifically, in the present invention, the radius of curvature R is constant by making the shape of the coil that drives the lens holder circular, so that the conductors of the coil can be accurately aligned. Winding is possible, and the magnetic field generated by the coil can be made undisturbed. Therefore,
The lens holder can be driven accurately.
又、曲率半径Ｒが一定であるので、該コイルの巻き線の
生産効率を高めることも可能である。Furthermore, since the radius of curvature R is constant, it is also possible to increase the production efficiency of the winding wire of the coil.
第１図は本発明に係る光学系駆動装置の構成を説明する
ための分解斜視図、第２図及び第３図は本発明に係るト
ラッキングコイルの正面図、第４図は従来のトラッキン
グコイルの正面図である。
１２・・・光学系駆動装置、５４．５６・・・トラッキ
ングコイル。
代 埋 入 弁理士 山 下 穣 平
第１図FIG. 1 is an exploded perspective view for explaining the configuration of an optical system driving device according to the present invention, FIGS. 2 and 3 are front views of a tracking coil according to the present invention, and FIG. 4 is a diagram of a conventional tracking coil. It is a front view. 12... Optical system drive device, 54.56... Tracking coil. Representative Patent Attorney Yohei Yamashita Figure 1
Claims (1)
体を基台に対して光学系の光軸方向又は光軸に直交する
方向に移動可能に支持する手段と、前記光学系保持体又
は基台のいずれか一方に設けられたコイルと、前記コイ
ルを横切るように磁界を形成する磁気回路とから成る光
学系駆動装置において、 前記コイルが前記光軸を含む面に平行な面内で円形状に
巻き線されて成ることを特徴とする光学系駆動装置。(1) An optical system holder holding an optical system, means for supporting the optical system holder movably in the optical axis direction of the optical system or in a direction perpendicular to the optical axis with respect to a base, and the optical system In an optical system drive device comprising a coil provided on either a holder or a base, and a magnetic circuit that forms a magnetic field across the coil, the coil is arranged in a plane parallel to a plane containing the optical axis. An optical system drive device characterized in that the wire is wound in a circular shape inside the drive device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27804585A JPS62139132A (en) | 1985-12-12 | 1985-12-12 | Optical system driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27804585A JPS62139132A (en) | 1985-12-12 | 1985-12-12 | Optical system driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62139132A true JPS62139132A (en) | 1987-06-22 |
Family
ID=17591876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27804585A Pending JPS62139132A (en) | 1985-12-12 | 1985-12-12 | Optical system driving device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62139132A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5724324A (en) * | 1995-09-29 | 1998-03-03 | Daewoo Electronics Co., Ltd. | Optical pickup actuator with an objective lens fixing part suspended by an elastic members |
-
1985
- 1985-12-12 JP JP27804585A patent/JPS62139132A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5724324A (en) * | 1995-09-29 | 1998-03-03 | Daewoo Electronics Co., Ltd. | Optical pickup actuator with an objective lens fixing part suspended by an elastic members |
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