JPH0249221A - Convergence lens driving device - Google Patents

Abstract

PURPOSE:To make disconnection hard to be generated at the time of performing winding and to make unrequired oscillation in a convergence lens hard to be generated by forming a structure to sandwich a convergence lens holding body which holds the convergence lens by bending circular arc parts confronted with the center of the winding of a ring shape electromagnetic coil. CONSTITUTION:An objective lens 1 is held with an objective lens holding body 2, and the objective lens holding body 2 is supported slidably freely with a sliding shaft 4 mounted perpendicularly to a substrate 3 and a bearing 5. Furthermore, the objective lens holding body 2 holds weight 6 having the same weight as that of the objective lens 1 at an opposite side setting the sliding shaft 4 as a symmetry axis, and a focusing coil 7 circularly winding the side plane of the objective lens 1 is mounted, and further, a tracking coil 8 is mounted so as to sandwich the objective lens holding body 2 and the focusing coil 7. In addition to that, a permanent magnet 9 is mounted on the substrate 3. The tracking coil 8 is formed in structure to sandwich the objective lens holding body 2 by bending the circular arc parts 8a confronted with the center of the winding of the coil wound circularly, which makes the disconnection hard to be generated and a make the unrequired oscillation hard to be generated in the objective lens.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、コンピュータの外部記憶装置等に利用する光
学式記憶装置の光ピツクアップのｙｊＡ！ＰＩＩ装置に
関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to an optical pickup of an optical storage device used as an external storage device of a computer, etc. This relates to PII devices.

（従来の技術） 従来、この種の光ピツクアップの駆動装置は、第３図に
示すように、対物レンズ１１を保持する対物レンズ保持
体１２にフォーカスコイル１３とトラッキングコイル１
４を取り付け、これらが基体１５に対して垂直に取り付
けられた摺動軸１６と軸受１７によって摺動自在に支承
されている。１８は対物レンズ１１と同じ重址の重りで
ある。各々２つのコイル１：３゜１４が永久磁石１９の
磁界中に置かれるように基体に永久磁石が取り付けられ
ており、各々２つのコイル１３．１４に電流を流すこと
によって、コイルに電磁力が作用して対物レンズ１１を
駆動するものである。前記２つのコイルのうち、フォー
カスコイル１；３は対物レンズＩＩの光軸に対して垂直
な面に巻線されて才９す、他方のトラッキングコイル１
４は対物レンズ１１の光軸に対して平行な面に巻線され
ており、さらに駆動装置を薄型にするため、矩形状に巻
線されていた。(Prior Art) Conventionally, as shown in FIG. 3, this type of optical pickup driving device has a focus coil 13 and a tracking coil 1 mounted on an objective lens holder 12 that holds an objective lens 11.
4 are attached, and these are slidably supported by a sliding shaft 16 and a bearing 17 attached perpendicularly to the base body 15. 18 is a weight having the same weight as the objective lens 11. Permanent magnets are attached to the base body so that each of the two coils 1:3° 14 is placed in the magnetic field of the permanent magnet 19, and by passing a current through each of the two coils 13 and 14, an electromagnetic force is applied to the coil. It acts to drive the objective lens 11. Of the two coils, the focus coils 1 and 3 are wound in a plane perpendicular to the optical axis of the objective lens II, and the other tracking coil 1
4 is wound in a plane parallel to the optical axis of the objective lens 11, and is wound in a rectangular shape in order to make the driving device thinner.

（発明が解決しようとする課題） 上記従来の光ピツクアップの駆動装置のトラッキングコ
イルの巻線方法では１巻線時に巻線中心と巻線外周の間
の径が常に変化して、矩形コーナ部で電線に大きな張力
が作用して電線が断線する事故が起こりやすかった。さ
らに、対物レンズ保持体に接着剤で取り付けると剛性が
弱く、対物レンズを駆動する際に不要な振動を対物レン
ズに与える欠点があった。(Problem to be Solved by the Invention) In the method of winding the tracking coil of the conventional optical pickup drive device described above, the diameter between the center of the winding and the outer periphery of the winding always changes during one winding, and the diameter between the center of the winding and the outer circumference of the winding always changes. A large amount of tension was applied to the wires, making it easy for them to break. Furthermore, when attached to the objective lens holder with an adhesive, the rigidity is weak, and there is a drawback that unnecessary vibrations are imparted to the objective lens when the objective lens is driven.

本発明の目的は、従来の欠点を解消し１巻線時に電線に
大きな張力が作用することなく、対物レンズの保持体に
接着剤で取り付けても剛性が高く、対物レンズを駆動し
ても不要な振動を対物レンズに与えない優れた光ピツク
アップの駆動装置を提供することである。The purpose of the present invention is to eliminate the drawbacks of the conventional wires, to avoid applying large tension to the wire during one winding, to provide high rigidity even when attached to the objective lens holder with adhesive, and to eliminate the need to drive the objective lens. It is an object of the present invention to provide an excellent optical pickup driving device that does not impart severe vibrations to an objective lens.

（課題を解決するための手段） 本発明の集光レンズ駆動装置は、情報記録媒体に集束光
を集光するレンズを備え、この集光レンズを情報記録媒
体と垂直方向および情報記録媒体と平行方向に駆動する
電磁コイルと永久磁石を備えた集光レンズ駆動装置にお
いて、輪状に電磁コイルを巻線したのち、輪状の中心に
対して対向する２つの弧部を輪状の成す面と垂直に曲げ
て整形するものである。(Means for Solving the Problems) A condensing lens driving device of the present invention includes a lens that condenses convergent light onto an information recording medium, and the condensing lens is moved in a direction perpendicular to the information recording medium and parallel to the information recording medium. In a condensing lens drive device equipped with an electromagnetic coil and a permanent magnet that are driven in the direction, the electromagnetic coil is wound in a ring shape, and then two arc parts facing the center of the ring are bent perpendicularly to the plane formed by the ring. It is a type of plastic surgery.

（作　用） 本発明によれば、トラッキングコイルの巻線方法を円形
にすることにより、電線の切断を防止することができ、
円形コイルの対向する２つの円弧部を曲げると共に、そ
の円弧部で対物レンズ保持体を挟み、剛性を確保して対
物レンズ駆動時に生ずる対物レンズの不要振動を防止で
きる。(Function) According to the present invention, cutting of the electric wire can be prevented by winding the tracking coil in a circular manner.
By bending the two opposing circular arc parts of the circular coil and sandwiching the objective lens holder between the circular arc parts, rigidity can be ensured and unnecessary vibrations of the objective lens that occur when driving the objective lens can be prevented.

（実施例） 本発明の一実施例を第１図および第２図に基づいて説明
する。(Example) An example of the present invention will be described based on FIGS. 1 and 2.

第１図は、本発明の光ピツクアップの駆動装置の構成を
示す斜視図である。同図において、１は対物レンズであ
り、対物レンズ保持体２に保持されており、対物レンズ
保持体２は基体３に垂直に取り付けられた摺動軸４と軸
受５によって摺動自在に支承されている。さらに、対物
レンズ保持体２は、摺動軸４を対称軸として対物レンズ
１と同じ重量の重り６を対物レンズ１と反対側に保持し
ており、対物レンズ１の側面を円形に巻線されたフォー
カスコイル７が取り付けられ、さらに対物レンズ保持体
２とフォーカスコイル７を挟むようにトラッキングコイ
ル８が取り付けられている。FIG. 1 is a perspective view showing the configuration of an optical pickup driving device according to the present invention. In the figure, reference numeral 1 denotes an objective lens, which is held by an objective lens holder 2. The objective lens holder 2 is slidably supported by a sliding shaft 4 and a bearing 5 attached perpendicularly to a base 3. ing. Furthermore, the objective lens holder 2 holds a weight 6 having the same weight as the objective lens 1 on the side opposite to the objective lens 1 with the sliding axis 4 as the axis of symmetry, and the side surface of the objective lens 1 is circularly wound. A focusing coil 7 is attached thereto, and a tracking coil 8 is further attached so as to sandwich the objective lens holder 2 and the focusing coil 7.

９は永久磁石で、基体３に取り付けられており。9 is a permanent magnet, which is attached to the base body 3.

永久磁石の生ずる磁界の向きは、フォーカスコイル７と
トラッキングコイル８の巻線方向に垂直である。The direction of the magnetic field generated by the permanent magnet is perpendicular to the winding direction of the focus coil 7 and the tracking coil 8.

第２図（ａ）、（ｂ）は本発明のトラッキングコイル８
の構成を示すもので、第２図（ａ）は円形に巻線された
トラッキングコイルで、第２図（ｂ）はそのトラッキン
グコイルの対向する円弧を巻線中心軸方向に曲げ加工を
行ったものである。FIGS. 2(a) and 2(b) show the tracking coil 8 of the present invention.
Fig. 2(a) shows the configuration of a tracking coil wound in a circular shape, and Fig. 2(b) shows a tracking coil whose opposing circular arcs are bent in the direction of the winding center axis. It is something.

次に、動作について説明する。フォーカスコイル７に電
流を流すと、永久磁石９の磁界によってフォーカスコイ
ル７に摺動軸４の軸方向に力が働き、対物レンズ保持体
２と共に対物レンズ１は摺動軸４の軸方向に移動する。Next, the operation will be explained. When current is applied to the focus coil 7, a force is applied to the focus coil 7 in the axial direction of the sliding shaft 4 due to the magnetic field of the permanent magnet 9, and the objective lens 1 moves in the axial direction of the sliding shaft 4 together with the objective lens holder 2. do.

さらに、トラッキングコイル８に電流を流すと、永久磁
石９の磁界によってトラッキングコイル８に活動軸４の
軸と回動力向に力が働き、対物レンズ保持体２と共に対
物レンズ１は摺動軸４を中心に回動する。Furthermore, when a current is applied to the tracking coil 8, a force is applied to the tracking coil 8 in the axis of the active axis 4 and the rotating direction due to the magnetic field of the permanent magnet 9, and the objective lens 1 and the objective lens holder 2 move along the sliding axis 4. Rotate around the center.

このように、フォーカスコイル７およびトラッキングコ
イル８に電流を流せば、対物レンズ１を摺動軸４方向お
よび摺動軸４を中心に回動させることができる。この際
、フォーカスコイル７およびトラッキングコイル８に作
用する力は、永久磁石９の磁界が前記２つのコイルの巻
線方向と垂直に作用する一部の領域に限って働くので、
この領域の剛性が弱いと不要な振動が対物レンズ１に起
きやすいが、第２図（ａ）の円形トラッキングコイルの
対向する円弧を、第２図（ｂ）のように曲げて対物レン
ズ保持体を挾むため、剛性が増し、対物レンズに不要な
振動を起こすことがない。In this way, by passing current through the focus coil 7 and the tracking coil 8, the objective lens 1 can be rotated in the sliding axis 4 direction and around the sliding axis 4. At this time, the force acting on the focus coil 7 and the tracking coil 8 acts only in a part of the region where the magnetic field of the permanent magnet 9 acts perpendicularly to the winding direction of the two coils.
If the rigidity in this region is weak, unnecessary vibrations are likely to occur in the objective lens 1. However, by bending the opposing arcs of the circular tracking coil in FIG. 2(a) as shown in FIG. 2(b), the objective lens holder is This increases rigidity and prevents unnecessary vibration from occurring in the objective lens.

（発明の効果） 本発明によれば、トラッキングコイルを円形に巻線した
のち対向する円弧を曲げるので巻線時に断線しにくく、
剛性が増すので対物レンズに不要な振動が起きにくくな
り、その実用上の効果は大である。(Effects of the Invention) According to the present invention, since the tracking coil is wound circularly and then the opposing circular arcs are bent, wire breakage is less likely to occur during winding.
Since the rigidity is increased, unnecessary vibrations are less likely to occur in the objective lens, which has a great practical effect.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例における光ピツクアップの駆
動装置の斜視図、第２図は同トラッキングコイルの斜視
図、第３図は従来の光ピツクアップの駆動装置の斜視図
である。 １・・・対物レンズ、　２・・・対物レンズ保持体、３
・・・基体、　４・・・摺動軸、　５・・・軸受、６　
・重り、　　７・・・フォーカスコイル、８・・・トラ
ッキングコイル、　８ａ−トラッキングコイルの円弧部
、　９・・・永久磁石。 特許出願人　松下電器産業株式会社 第 ２図 （ａ） （ｂ） ２文寸郊ｖし　レノぐ石にト予体FIG. 1 is a perspective view of an optical pickup driving device according to an embodiment of the present invention, FIG. 2 is a perspective view of the same tracking coil, and FIG. 3 is a perspective view of a conventional optical pickup driving device. 1... Objective lens, 2... Objective lens holder, 3
... Base body, 4 ... Sliding shaft, 5 ... Bearing, 6
- Weight, 7...Focusing coil, 8...Tracking coil, 8a-Arcuum part of tracking coil, 9...Permanent magnet. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 2 (a) (b)

Claims (1)

【特許請求の範囲】[Claims] 　情報記録媒体に集束光を集光するレンズを備え、前記
集光レンズを情報記録媒体と垂直方向および前記情報記
録媒体と平行方向に駆動する電磁コイルと永久磁石を備
えた集光レンズ駆動装置において、輪状電磁コイルの巻
線中心に対向する円弧部を曲げて前記集光レンズを保持
する集光レンズ保持体を挟む構造にしたことを特徴とす
る集光レンズ駆動装置。A condensing lens driving device comprising a lens for condensing focused light onto an information recording medium, and comprising an electromagnetic coil and a permanent magnet for driving the condensing lens in a direction perpendicular to the information recording medium and in a direction parallel to the information recording medium. A condensing lens drive device, characterized in that a condensing lens holder for holding the condensing lens is sandwiched between the circular arc portions of the annular electromagnetic coil that are opposed to the winding centers thereof.