JPS60201538A - Objective lens device - Google Patents
Objective lens deviceInfo
- Publication number
- JPS60201538A JPS60201538A JP5655484A JP5655484A JPS60201538A JP S60201538 A JPS60201538 A JP S60201538A JP 5655484 A JP5655484 A JP 5655484A JP 5655484 A JP5655484 A JP 5655484A JP S60201538 A JPS60201538 A JP S60201538A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- lens holding
- support shaft
- center
- holding barrel
- 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
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
- G11B7/09—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
- G11B7/0929—Electromechanical actuators for lens positioning for tracking only
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
〈発明の技術分野〉
本発明は光学式ディスクプレーヤに使用される対物レン
ズ装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an objective lens device used in an optical disc player.
〈背景技術〉
従来のこの種の対物レンズ装置は特開昭５７−２１０４
５７号公報に見られるように、対物レンズを支持する対
物レンズ保持筒をその中心で軸、支し、この対物レンズ
保持筒に関係して設けた磁気回路手段によりフォーカス
方向（対物レンズの光軸方向）及びトラッキング方向（
ディスクの半径方向）の調整をできるように成っている
。<Background Art> A conventional objective lens device of this type is disclosed in Japanese Patent Application Laid-Open No. 57-2104.
As seen in Publication No. 57, an objective lens holding tube supporting an objective lens is supported by a shaft at its center, and a magnetic circuit means provided in relation to this objective lens holding tube is used to direct the focus direction (optical axis of the objective lens). direction) and tracking direction (
The radial direction of the disc can be adjusted.
ところで、斯る構造の対物レンズ装置において、トラッ
キング方向の調整を充分できるようにするためには上記
対物レンズの上記保持筒の回転中心からの偏心量を大き
くする必要があり、従ってレンズ保持筒の直径が大きく
なって装置全体が大型化する欠点がある。By the way, in an objective lens device having such a structure, in order to sufficiently adjust the tracking direction, it is necessary to increase the eccentricity of the objective lens from the center of rotation of the holding tube. This has the disadvantage that the diameter increases, making the entire device larger.
〈本発明の目的〉
本発明は上記従来装置の欠点に鑑みて発明されたもので
あり、対物レンズ保持筒を軸支する支軸を対物レンズ保
持筒の中心から偏心した位置に設けることにより、対物
レンズ保持筒の直径を大きくすることなく充分なトラッ
キング方向の調整ができる対物レンズ装置を提供せんと
するものである。<Objective of the present invention> The present invention was invented in view of the drawbacks of the above-mentioned conventional devices, and by providing a supporting shaft for pivotally supporting the objective lens holding cylinder at a position eccentric from the center of the objective lens holding cylinder, It is an object of the present invention to provide an objective lens device capable of sufficiently adjusting the tracking direction without increasing the diameter of the objective lens holding cylinder.
〈本発明の実施例〉
以下、本発明の一実施例を添付図面に従って詳細に説明
する。<Embodiment of the present invention> Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
第１図乃至第４図は本発明に係る対物レンズ装置の斜視
図平面図、正面断面図及び分解斜視図であって、図中１
は板面上中心に支軸２を立設したベース体にして、この
支軸２を挾む左右の位置に円弧状の第１のヨーク３及び
３′を備えると共にこれらヨークと直交する前後の方向
において上記支軸２を挾むように止め穴５ａ、５ａ’を
有する支持突起４，４′を備え、かつ、支軸２と第１の
ヨーク３との間の板面に光ビームを通過させる透孔６を
穿設している。1 to 4 are a perspective plan view, a front sectional view, and an exploded perspective view of an objective lens device according to the present invention, and FIG.
has a base body with a support shaft 2 erected at the center of the plate surface, and is provided with arc-shaped first yokes 3 and 3' at left and right positions sandwiching this support shaft 2, and front and rear yokes orthogonal to these yokes. The support projections 4 and 4' having stopper holes 5a and 5a' are provided so as to sandwich the support shaft 2 in the direction, and the plate surface between the support shaft 2 and the first yoke 3 is provided with a transparent plate that allows the light beam to pass through. A hole 6 is bored.
７及び７′は上記第１のヨーク３．３′の外側において
ベース体１上に載置固定されたマグネットにして、その
上面には上記第１のヨーク３，３′の円弧に沿った円弧
面８ａ、８ａ’ を持つ第２のヨーク８，８′が固着さ
れている。7 and 7' are magnets placed and fixed on the base body 1 on the outside of the first yokes 3 and 3', and the upper surface thereof has an arc along the arc of the first yokes 3 and 3'. A second yoke 8, 8' with surfaces 8a, 8a' is fixed.
９は下面を開口した円筒体より成る対物レンズ保持筒に
して、その閉成端面、即ち、上壁面の裏面には斯る上壁
面の中心Ｏより位置を偏らした箇所に上記支軸２に挿入
支持されるための軸受部１０を有し、かつ、上記上壁面
には上記中心Ｏと軸受部１０の中心（支軸２の中心）を
結ぶ線ｌ上において上記軸受部１０と反対側の位置に対
物レンズ１４を嵌着するだめのレンズ保持口１１を有す
ると共に上記中心Ｏと軸受部１０の中心を結ぶ線ｌと直
交する方向において上記中心Ｏを挾むように挿口１２，
１２’を開口している。Reference numeral 9 denotes an objective lens holding tube made of a cylindrical body with an open bottom surface, and the closed end surface thereof, that is, the back surface of the upper wall surface, is inserted into the above-mentioned support shaft 2 at a position offset from the center O of the upper wall surface. It has a bearing part 10 for being supported, and a position on the upper wall surface opposite to the bearing part 10 on a line l connecting the center O and the center of the bearing part 10 (the center of the support shaft 2). has a lens holding opening 11 into which the objective lens 14 is fitted, and an insertion opening 12 which is sandwiched between the center O in a direction orthogonal to the line l connecting the center O and the center of the bearing part 10.
12' is open.
又、この対物レンズ保持筒９は上記レンズ保持口１１を
有する側とは反対側の上壁面の周縁を欠損１３して、こ
の部分にバランス用の重り１５を固着している。Further, the objective lens holding cylinder 9 has a cutout 13 at the periphery of the upper wall surface on the side opposite to the side having the lens holding port 11, and a balance weight 15 is fixed to this portion.
１６は上記対物レンズ保持筒９の外周に直接巻回された
フォーカス用コイル、１７及び１７′はこのフォーカス
用コイルの外周に固着さ才したトラッキング用コイルで
ある。Numeral 16 is a focusing coil wound directly around the outer periphery of the objective lens holding tube 9, and 17 and 17' are tracking coils fixed to the outer periphery of this focusing coil.
１８はゴム等の弾性材料で形成された中立保持具にして
、上記軸受部１０に被挿される本体部１８ａとこの本体
部１８ａの前後に水平に延在され先端に止め穴１８ｃ
、１８ｃ’を有した保持アーム部１８ｂ、１８ｂ’ と
よ・り成っている。Reference numeral 18 denotes a neutral holder made of an elastic material such as rubber, and includes a main body 18a that is inserted into the bearing 10, and a stopper hole 18c extending horizontally in front and behind the main body 18a.
, 18c'.
そして、上記対物レンズ保持筒９は上述のように対物レ
ンズ１４．各コイル１６及び１７．１７’を固着すると
共に軸受部１０に本体部１８ａを以って中立保持具１８
を被挿しだ上で、斯る中立保持具１８の保持アーム部ｉ
ｓｂ、ｉｓｂ’が支持突起４，４？上に載るように軸受
部１０を以って上記支軸２に挿入支持され、更に、上記
上壁面に設けた挿口１２，１２’を通して止め部材１９
゜１９′を中立保持具と支持突起の止め穴１８Ｃ１１８
ｃ′及び５ａ、５ａ’に挿入することにより抜は止めさ
れる。The objective lens holding tube 9 is attached to the objective lens 14 as described above. While fixing each coil 16 and 17.17', the neutral holder 18 is attached to the bearing part 10 with the body part 18a.
is inserted, the holding arm part i of the neutral holding device 18
sb, isb' are support protrusions 4, 4? The stop member 19 is inserted and supported by the support shaft 2 with the bearing part 10 so as to rest on it, and is further inserted through the sockets 12 and 12' provided in the upper wall surface.
゜19' is the fixing hole of the neutral holder and the support protrusion 18C118
By inserting it into c', 5a, and 5a', removal is prevented.
このように支軸２に挿入支持された状態で対物レンズ保
持筒９は支軸２に沿って上下動（フォーカス方向）と回
動（ラジアル方向）ができる上に、その周縁を上記第１
のヨークと第２のヨーク間に位置させると共に対物レン
ズ１４をベース体１上の透孔６に対向させているＯ
従って、上記フォーカス用コイル１６及びトラッキング
用コイル１７．１７’に夫々電流を流すと、対物レンズ
保持筒９はその電流値に比例した割合で支軸２に沿って
フォーカス方向に上下動すると共に同支軸２を中心にラ
ジアル方向に回動し、図示しない回路手段及びその他の
メカニカル手段と協同して対物レンズ１４より放射され
る光ビームをディスク上のトラックの所定の位置に当て
ることができる。In this state that the objective lens holding cylinder 9 is inserted and supported on the support shaft 2, it can move up and down (in the focus direction) and rotate (in the radial direction) along the support shaft 2.
The objective lens 14 is positioned between the yoke and the second yoke, and the objective lens 14 is opposed to the through hole 6 on the base body 1. Therefore, a current is passed through the focusing coil 16 and the tracking coil 17, 17', respectively. Then, the objective lens holding tube 9 moves up and down in the focus direction along the support shaft 2 at a rate proportional to the current value, and also rotates in the radial direction about the support shaft 2, and the objective lens holding cylinder 9 moves in the radial direction around the support shaft 2, and connects circuit means and other components (not shown). In cooperation with mechanical means, the light beam emitted from the objective lens 14 can be directed to a predetermined position on a track on the disk.
ところで、本発明では上記トラッキング用コイル１７及
び１７′の取り付は位置について第１図第２図及び第５
図に示すように格別の考慮を計っている。Incidentally, in the present invention, the tracking coils 17 and 17' are mounted in accordance with the positions shown in FIG. 1, FIG. 2, and FIG.
Special consideration has been taken as shown in the figure.
即ち、トラッキング用コイル１７．１７’は第４図から
明らかなように縦部分ａ、ａ′と横部分す、ｂ’から成
る平面状の環状体となるようにコイルを順次環状に巻回
したもので、一方の縦部分ａの幅方向中心Ｑ＋ 、Ｑ２
が上記第１．第２のヨークの中心に対向した位置で上記
対物レンズ保持筒９の中心Ｏと支軸２の中心を結ぶ線ｌ
上に位置するようにフォーカス用コイル１６の外周面に
固着されている。That is, as is clear from FIG. 4, the tracking coil 17, 17' is a planar annular body consisting of vertical portions a and a' and horizontal portions a and b'. The center of the width direction of one vertical portion a is Q+, Q2
is the above 1st. A line l connecting the center O of the objective lens holding cylinder 9 and the center of the support shaft 2 at a position opposite to the center of the second yoke.
It is fixed to the outer peripheral surface of the focusing coil 16 so as to be positioned above.
このようにトラッキング用コイル１７．１７’をフォー
カス用コイル１６上に固着することによ覧斯るトラッキ
ング用コイル１７．１７’に基づく磁界の対物レンズ保
持筒９への作用点が上記中心Ｑｌ、Ｑ２の位置となると
共にその駆動力Ｆ１（Ｆｌ’）及びＦ ２ （Ｆ２’
）が上記線ｌに垂直な方向、即ち、対物レンズ保持筒９
の接線方向に働く、従って、上記駆動力Ｆ １（Ｆｌ’
）、 Ｆ２（Ｆ２’ ）は支軸２を歪曲させる力の成
分を含まず、対物レンズ保持筒９を支軸２を中心にして
円滑に回転させるととができる。By fixing the tracking coil 17.17' on the focusing coil 16 in this way, the point of action of the magnetic field based on the tracking coil 17.17' on the objective lens holding cylinder 9 is set at the center Ql, Q2 position and its driving forces F1 (Fl') and F2 (F2'
) is perpendicular to the line l, that is, the objective lens holding cylinder 9
Therefore, the driving force F 1 (Fl'
), F2 (F2') does not include a force component that distorts the support shaft 2, and allows the objective lens holding cylinder 9 to rotate smoothly around the support shaft 2.
尚、上記作用点が例えば、第５図中対物レンズ保持筒９
の点ＰＩ、Ｐ２に位置するようにトラッキング用コイル
と各ヨーク及びマグネットの配置関係を設定すると、夫
々の作用点における駆動力ｆｌ、ｆｚの分力ｆｏ＋ｆｕ
が支軸２に歪曲させる側圧力として働き、対物レンズ保
持筒９の円滑な回転が阻害されることは言うまでもない
〇又、本発明では上記トラッキング用コイル１７と１７
′のアンペア・ターン比を、即ち、電流と巻数の積の比
を、支軸２から上記各作用点までの距離ｒｌ 、ｒ２の
比に比例して、次式％式％
が得られるよりなＦｌ、Ｆ２を発生する値に選択し、対
物レンズ保持筒９の円滑な回転を得るよう構成している
。Note that the above point of action is, for example, the objective lens holding tube 9 in FIG.
If the arrangement of the tracking coil and each yoke and magnet is set so that they are located at points PI and P2, the component forces fo+fu of the driving forces fl and fz at the respective points of action are
Needless to say, this acts as a side pressure that distorts the support shaft 2, and the smooth rotation of the objective lens holding cylinder 9 is inhibited.In addition, in the present invention, the above-mentioned tracking coils 17 and 17
The ampere-turn ratio of ', that is, the ratio of the product of the current and the number of turns, is proportional to the ratio of the distances rl and r2 from the spindle 2 to each of the points of application mentioned above, so that the following formula % formula % can be obtained. Fl and F2 are selected to generate values, and the objective lens holding cylinder 9 is configured to rotate smoothly.
又、本発明では、他の実施例として第６図に示すように
第１のヨーク３，３′と第２のヨーク８゜８′の円弧面
８ａ 、８ａ’の曲率半径ｒ’、Ｒ’及びｒ、Ｒの中心
を支軸２の中心とすることにより、磁力線の方向が支軸
２を中心に放射状に形成されるようにしである。In addition, according to another embodiment of the present invention, as shown in FIG. By setting the centers of , r, and R as the center of the support shaft 2, the directions of the magnetic lines of force are formed radially around the support shaft 2.
このことにより、トラッキング用コイル１７゜１７′よ
り発生する駆動力Ｆ １＋ Ｆ ２が常に支軸２からの
法線に垂直に働くことＸなるため、対物レンズ保持筒９
の回転角度が大きくなっても支軸２に対して側圧がか＼
らず、従って、第５図の場合に比して対物レンズ保持筒
９をより円滑に回転させることができる。As a result, the driving force F 1 + F 2 generated by the tracking coil 17° 17' always acts perpendicular to the normal line from the support shaft 2, so that the objective lens holding cylinder 9
Even if the rotation angle of
Therefore, the objective lens holding cylinder 9 can be rotated more smoothly than in the case shown in FIG.
更に、又、本発明では上記対物レンズ保持筒９の外周面
に第７図に示すように外周全体に亘って縦方向に伸びる
リブ２ｏを等間隔に多数設けてフォＡ’−、４：フイル
１６と対物レンズ保持筒９との間に゛隙間を設け、各コ
イル部分での発熱に対する放熱効果を向上させる構造と
している。Furthermore, in the present invention, as shown in FIG. 7, a large number of ribs 2o are provided at equal intervals on the outer peripheral surface of the objective lens holding cylinder 9, extending vertically over the entire outer periphery. A gap is provided between the objective lens holding tube 16 and the objective lens holding cylinder 9 to improve the heat dissipation effect against heat generated in each coil portion.
〈本発明の効果〉
本発明は斜上のように構成されるものであるから、対物
レンズ保持筒の径を大きくすることなく対物レンズの回
転中心からの偏心量を大きくしてトラッキング方向の調
整を充分できる優れた発明である。<Effects of the Present Invention> Since the present invention is configured in a diagonal manner, the tracking direction can be adjusted by increasing the amount of eccentricity from the rotation center of the objective lens without increasing the diameter of the objective lens holding cylinder. This is an excellent invention that can fully accomplish this.
【図面の簡単な説明】
第１図乃至第４図は本発明に係る対物レンズ装置の斜視
図、平面図、正面断面図及び分解斜視図を示し、第５図
はその動作説明図、第６図は他の実施例の平面図、第７
図は上記対物レンズ装置における対物レンズ保持筒の異
る実施例を示す斜視図である。
２：支軸、９：対物レンズ保持筒、１４：対物レンズ。[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 to 4 show a perspective view, a plan view, a front sectional view, and an exploded perspective view of the objective lens device according to the present invention, and FIG. The figure is a plan view of another embodiment.
The figure is a perspective view showing a different embodiment of the objective lens holding cylinder in the objective lens device. 2: Support shaft, 9: Objective lens holding cylinder, 14: Objective lens.
Claims (1)
心に回動可能に、かつ、支軸に沿って摺動可能とし、上
記対物レンズより放射される光ビームを所定の位置に集
束させるものにおいて、上記支軸の位置を上記対物レン
ズ保持筒の中心より偏位させた事を特徴とする対物レン
ズ装置。1. The objective lens holding tube holding the objective lens is made rotatable around a support shaft and slidable along the support shaft, and the light beam emitted from the objective lens is focused at a predetermined position. An objective lens device, characterized in that the position of the support shaft is offset from the center of the objective lens holding cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5655484A JPS60201538A (en) | 1984-03-22 | 1984-03-22 | Objective lens device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5655484A JPS60201538A (en) | 1984-03-22 | 1984-03-22 | Objective lens device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60201538A true JPS60201538A (en) | 1985-10-12 |
Family
ID=13030325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5655484A Pending JPS60201538A (en) | 1984-03-22 | 1984-03-22 | Objective lens device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60201538A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5416640A (en) * | 1989-11-24 | 1995-05-16 | Matsushita Electric Industrial Co., Ltd. | Objective actuator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56119944A (en) * | 1980-02-27 | 1981-09-19 | Sony Corp | Disc player |
| JPS5940329A (en) * | 1982-08-30 | 1984-03-06 | Sony Corp | Optical pickup |
-
1984
- 1984-03-22 JP JP5655484A patent/JPS60201538A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56119944A (en) * | 1980-02-27 | 1981-09-19 | Sony Corp | Disc player |
| JPS5940329A (en) * | 1982-08-30 | 1984-03-06 | Sony Corp | Optical pickup |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5416640A (en) * | 1989-11-24 | 1995-05-16 | Matsushita Electric Industrial Co., Ltd. | Objective actuator |
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