JPS61182642A - Device for driving objective lens - Google Patents
Device for driving objective lensInfo
- Publication number
- JPS61182642A JPS61182642A JP2222085A JP2222085A JPS61182642A JP S61182642 A JPS61182642 A JP S61182642A JP 2222085 A JP2222085 A JP 2222085A JP 2222085 A JP2222085 A JP 2222085A JP S61182642 A JPS61182642 A JP S61182642A
- Authority
- JP
- Japan
- Prior art keywords
- center
- movable part
- gravity
- objective lens
- tracking direction
- 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.)
- Granted
Links
Landscapes
- Mechanical Optical Scanning Systems (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は光学的に情報を書き込むあるいは読み取る装置
の対物レンズ駆動装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an objective lens driving device for an apparatus for optically writing or reading information.
従来の技術
対物レンズ駆動装置は、コンパクトディスクなどの円盤
状記録媒体の反りの上下運動によるフォーカスずれや、
偏心等によるトラッキングずれを補正するために、対物
レンズをフォーカス方向およびトラッキング方向の２軸
に駆動する。Conventional technology objective lens drive devices are susceptible to focus shifts caused by vertical movement of warped disc-shaped recording media such as compact discs,
In order to correct tracking deviation due to eccentricity, etc., the objective lens is driven in two axes, the focus direction and the tracking direction.
従来のこの種対物レンズ駆動装置は、例えば特開昭５８
−６４６４９号公報に示されているように、第４図のよ
うな構造になっていた。A conventional objective lens driving device of this type is disclosed in, for example, Japanese Patent Application Laid-open No. 58
As shown in Japanese Patent No. 64649, it had a structure as shown in FIG.
すなわち、板バネ１８ａ〜１８ｄにより支持されたレン
ズ１４を有する本体を磁気回路１９ａ。That is, a main body having a lens 14 supported by plate springs 18a to 18d is a magnetic circuit 19a.
１９ｂとトラッキング用コイル１６を用いた動電型変換
器によってトラッキング方向Ｔ、に、磁気回路１９ａ、
１９ｂとフォーカス用コイル１７を用いた動電型変換器
によってフォーカス方向Ｆ。19b and an electrodynamic transducer using the tracking coil 16 in the tracking direction T, the magnetic circuit 19a,
19b and an electrodynamic transducer using a focusing coil 17.
に駆動している。その運動は、トラッキング方向駆動時
には第５図四のどと可動部重心ｑ。に対して前記２つの
磁気回路から生じる駆動力Ｔ１．Ｔ２が働き、前記板バ
ネのトラッキング用板バネ部のたわみに支持されてトラ
ッキング方向へ動く。同様に、フォーカス方向駆動時に
は第６図の）のごとく可動部重心ｑ０に対して前記２つ
の磁気回路から駆動力Ｆ、、Ｆ２ が働き、前記板バ
ネのフォーカス用板バネ部のたわみに支持されてフォー
カス方向へ動く。is driven by. When driving in the tracking direction, the movement is between the throat and the center of gravity of the movable part q in FIG. The driving force generated from the two magnetic circuits T1. T2 works and moves in the tracking direction supported by the deflection of the tracking leaf spring portion of the leaf spring. Similarly, when driving in the focus direction, the driving forces F, , F2 act on the center of gravity q0 of the movable part from the two magnetic circuits as shown in ) in FIG. and move in the focus direction.
かつ、この対物レンズ駆動装置全体を記録媒体上のアク
セス方向ＡＣ（トラッキング方向と同方向）にモータで
アクセス駆動している。The entire objective lens driving device is driven by a motor in the access direction AC (same direction as the tracking direction) on the recording medium.
発明が解決しようとする問題点
しかし、このような構造のものでは、データ転送などで
要求される高速アクセス時のアクセス方向の運動や、他
の衝！によって、対物レンズがトラッキング方向に振れ
る。すなわち、第６図■において可動部重心にアクセス
駆動による慣性力Ｔ３が働き、トラッキング方向駆動時
のごとく、対物レンズがトラッキング方向に駆動される
。Problems to be Solved by the Invention However, with such a structure, movement in the access direction during high-speed access required for data transfer, etc., and other collisions can be avoided. This causes the objective lens to swing in the tracking direction. That is, in FIG. 6 (2), an inertial force T3 due to the access drive acts on the center of gravity of the movable part, and the objective lens is driven in the tracking direction as in the case of driving in the tracking direction.
前記のごとく、対物レンズ駆動装置自体が衝撃に対して
弱いため、コンパクトディスクプレイヤーでも、可動中
に衝撃によって、音飛びを生じたり、また、データ録音
システムにおいて、データ書き込み時に録音エラーを生
じたりするので、対物レンズ駆動装置を載せるシステム
の中に前記衝撃を吸収する構成を別途に設けなければな
らないというのが現状であった。As mentioned above, the objective lens drive unit itself is vulnerable to shocks, so even compact disc players can cause skipping due to shocks while in operation, and data recording systems can cause recording errors when writing data. Therefore, the current situation is that a structure for absorbing the impact must be separately provided in the system in which the objective lens driving device is mounted.
そこで、本発明は駆動時に、このような衝撃の影響を受
けない安定した対物レンズ駆動装置を提供するものであ
る。Therefore, the present invention provides a stable objective lens driving device that is not affected by such impacts during driving.
問題点を解決するための手段
そして前記問題点を解決する本発明の技術的な手段は、
認可動部の重心と、固定部からの支持点とを一致させ、
支持系固定部により衝撃を支えるものである。Means for solving the problems and technical means of the present invention for solving the problems are:
Align the center of gravity of the approved moving part with the support point from the fixed part,
The support system supports the impact by the fixed part.
作 用 この技術的手段による作用は次のようになる。For production The effect of this technical means is as follows.
すなわち、トラッキング方向の認可動部重心と、軸ある
いはピボット等の支持系中心とを一致させ、トラッキン
グ方向への運動を可動部重心、すなわち前記軸あるいは
ピボット等の支持系を中心とした回動運動とし、可動し
ても前記可動部重心の位置が変わらないことにより、前
記衝撃に対して支持系固定部により支えるようになるの
である。That is, by aligning the center of gravity of the approved moving part in the tracking direction with the center of a support system such as a shaft or pivot, the movement in the tracking direction is a rotational movement about the center of gravity of the moving part, that is, the support system such as the shaft or pivot. Since the position of the center of gravity of the movable part does not change even when the movable part moves, the impact is supported by the support system fixed part.
実施例 以下、本発明の一実施例を図面に基づいて説明する。Example Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図（８）が本実施例の対物レンズ駆動装置の平面図
で、第１図（Ｂ）が同正面図である。FIG. 1(8) is a plan view of the objective lens driving device of this embodiment, and FIG. 1(B) is a front view thereof.
１は記録媒体上に光学的に情報全書き込むあるいは読み
取る装置の対物レンズ（以下レンズという）、２はレン
ズ１を保持するレンズホルダで、レンズ１とレンズホル
ダ２とで第１の可動部を構成する。３は軸５により記録
媒体面に対して平行に
かつ半径方向であるトラッキング方向のみ回動自在に固
定された第２の可動部で、軸５の中心に全可動部の重心
が位置するように構成されている。1 is an objective lens (hereinafter referred to as a lens) of a device for optically writing or reading all information on a recording medium; 2 is a lens holder that holds the lens 1; the lens 1 and the lens holder 2 constitute a first movable part; do. Reference numeral 3 denotes a second movable part which is fixed rotatably only in the tracking direction, which is parallel to the surface of the recording medium and in the radial direction, by a shaft 5, and the center of gravity of all the movable parts is located at the center of the shaft 5. It is configured.
４ａ〜４ｂは前記第１の可動部のみ、記録媒体面に対し
て垂直な光軸方向、すなわちフォーカス方向に可動可能
になるように前記第１．第２の可動部とを連結する板バ
ネ、８は前記第１．第２の可動部が前記トランキング方
向に動いた後、元の位置に復帰するためのバネ材、９ａ
、９ｂは前記第１の町動部をフォーカス方向に駆動す
るための磁気回路、９ａ、９ｃは前記第１．第２の町動
部をトラッキング方向へ駆動するための磁気回路、１゜
は支持系固定部、１１はフォーカス用コイル、１２はト
ラッキング用コイル、１３はペースである。4a to 4b are the first movable parts such that only the first movable part is movable in the optical axis direction perpendicular to the recording medium surface, that is, in the focus direction. A leaf spring 8 connects the second movable part to the first movable part. a spring member 9a for returning the second movable part to its original position after moving in the trunking direction;
, 9b are magnetic circuits for driving the first movement section in the focusing direction, and 9a and 9c are the magnetic circuits for driving the first movement section in the focus direction. A magnetic circuit for driving the second moving part in the tracking direction, 1° is a support system fixing part, 11 is a focusing coil, 12 is a tracking coil, and 13 is a pace.
以上のように構成された本実施例につき、以下その動作
を説明する。The operation of this embodiment configured as above will be described below.
まず、トラッキング方向への運動は、磁気回路９ａ 、
９ｃとコイル１２から生じる駆動力Ｆ１．Ｆ２によって
第２図問に示すごとく、全可動部重心Ｇ（以下重心Ｇと
いう）、すなわちペース１３からの軸６を中心とした回
転運動となる。この時、駆動力Ｆ１．Ｆ２は板バネ４ａ
〜４ｄに無理な力が加わらないように以下のように調整
しである。First, the movement in the tracking direction is caused by the magnetic circuit 9a,
9c and the driving force F1 generated from the coil 12. As shown in the second diagram, F2 causes rotational movement about the center of gravity G of all movable parts (hereinafter referred to as center of gravity G), that is, the axis 6 from the pace 13. At this time, driving force F1. F2 is the leaf spring 4a
Adjust as follows to avoid applying excessive force to ~4d.
第β図は動作を説明するために簡略化した本実施例の構
成を示すものである。第３図において、Ｇは軸及び系全
体の重心、ｍｌ、ｍ２は各可動部の質量、ｐ、１ｏ、ｘ
。。は軸から各可動部重心までの距離、２１．２２は軸
から各駆動力の作用的までの距離、ｆｌ。FIG. .beta. shows a simplified configuration of this embodiment for explaining the operation. In Figure 3, G is the axis and the center of gravity of the entire system, ml, m2 are the masses of each moving part, p, 1o, x
. . is the distance from the axis to the center of gravity of each movable part, 21.22 is the distance from the axis to the effective point of each driving force, fl.
ｆ２は各可動部重心に作用する力、Ｆｌ、Ｆ２は各駆動
力、θ１．θ２は駆動開始後を秒後の各変位角である。f2 is the force acting on the center of gravity of each movable part, Fl and F2 are each driving force, θ1. θ2 is each displacement angle seconds after the start of driving.
すなわち、第３図のモデル図において、重心Ｇに働く力
ｆ１．ｆ２は以下の（１）式のようになる。That is, in the model diagram of FIG. 3, the force f1. acting on the center of gravity G. f2 is expressed as the following equation (1).
ここで、系全体の重心が重心Ｇ点だから、以下の（２）
式が成立する。Here, since the center of gravity of the entire system is the center of gravity point G, the following (2)
The formula holds true.
ｍ１２１＝ｍ２２２ ・・・・
・・（２）また、各可動部を連結する板バネが剛体であ
れば、θ１＝０２すなわち角加速度が一定となり以下の
（３）式が成立する。m121=m222...
(2) Furthermore, if the leaf spring connecting each movable part is a rigid body, θ1=02, that is, the angular acceleration is constant, and the following equation (3) holds true.
θ、＝０２ ・・・・・
・（３）（１）式〜（３）式より、（４）式、（５）式
が成り立つ。θ,=02...
- (3) From equations (1) to (3), equations (4) and (5) hold true.
ｆ１＝ｆ２ ・・・・・・
（４）ｆ２ ＝’２″”２０／”２
（４）式、（６）’１整理すると、以下の（６）式が成
立する。f1=f2...
(4) f2 ='2''''20/''2 By rearranging equation (4) and (6)'1, the following equation (6) holds true.
この（６）式により駆動力Ｆ、、Ｆ２ を調整すると
、もし板バネの剛性が小さくとも、板バネには無理な力
が加わらないことが分かる。If the driving forces F, , F2 are adjusted using this equation (6), it can be seen that even if the rigidity of the leaf spring is small, no unreasonable force is applied to the leaf spring.
また、高速アクセス等のトラ・フキング方向Ｔ。Also, the traffic direction T for high-speed access, etc.
への衝撃が加っても、前記衝撃が可動部に与える力は全
て重心Ｇ点に加わるので、前記重心が支持系である軸５
によってペース１３に固定されていることにより、固定
部や前記板バネの横方向の剛性が十分強ければ町動部に
は衝撃の影響が全くないのと同等になる。Even if an impact is applied to the movable part, all the force exerted by the impact on the movable part is applied to the center of gravity G, so the center of gravity is the support system of the shaft 5.
Since it is fixed to the pace 13 by the above, if the fixed part and the leaf spring have sufficient lateral rigidity, it is as if the moving part is not affected by the impact at all.
また、フォーカス方向Ｆ０へは、磁気回路９＆。Further, in the focus direction F0, a magnetic circuit 9 &.
９ｂとコイル１１により生じる駆動力Ｆ３ によってレ
ンズを含むレンズホルダ２０重心ｑ１ヲフォーカス方向
Ｆ０に駆動する。この時、町動部を支持する板バネ４ａ
〜４ｃｔＨ５第２図（Ｂ）に示すごとく重心からの延長
線２上に連結されているため。The center of gravity q1 of the lens holder 20 including the lens is driven in the focus direction F0 by the driving force F3 generated by the lens 9b and the coil 11. At this time, the leaf spring 4a supporting the town moving part
~4ctH5 As shown in Fig. 2 (B), it is connected on the extension line 2 from the center of gravity.
駆動による可動部のダイナミックな乱れは全くないＯ
尚、板バネの高次共振を抑止するために、板バネの表面
又は裏面の少なくとも一方の面に、ゴム等の弾性材を粘
着剤により接着しても良い。There is no dynamic disturbance of the movable parts due to the drive.In order to suppress high-order resonance of the leaf spring, an elastic material such as rubber is adhered with adhesive to at least one of the front and back surfaces of the leaf spring. It's okay.
発明の効果
本発明は、対物レンズ駆動装置のトラッキング方向の認
可動部重心と、軸あるいはピボット等の支持系中心とを
一致させ、トラッキング方向の運動を可動部重心、すな
わち軸あるいはピボット等の支持系を中心とした回転運
動としたことにより。Effects of the Invention The present invention aligns the center of gravity of the moving part of the objective lens drive device in the tracking direction with the center of the support system such as the shaft or pivot, and controls the movement in the tracking direction by aligning the center of gravity of the moving part in the tracking direction with the center of the support system such as the shaft or pivot. By making the system a rotating motion around the center.
光軸に垂直方向の衝撃に対して支持系固定部により支え
るようになるので、対物レンズ駆動装置が動作中でも前
記のような衝撃の影響を全く受けないという効果を奏す
るため、対物レンズ駆動装置を載せるシステムの設計を
簡単に成し得る。Since the support system fixing portion supports the impact perpendicular to the optical axis, the objective lens driving device is completely unaffected by the above-mentioned impact even during operation. It is easy to design a system for mounting.
第１図問は本発明の一実施例の対物レンズ駆動装置の平
面図、第１図の）は同対物レンズ駆動装置の正面図、第
２図問は同対物レンズ駆動装置の機能を示す要部平面図
、第２図の）は同要部正面図、第３図は同対物レンズ駆
動装置の機能を示すモデル図、第４図は従来の対物レン
ズ駆動装＃を示す斜視図、第６図（〜は同要部平面図、
第５図（Ｂ）は同要部正面図である。
１・・・・・・レンズ、２・・・・・・レンズホルダ、
３・・・・・・第２の可動部、４ａ〜４ｄ・・・・・・
板バネ、８・・・・・・バネ材、９ａ〜９Ｃ・・・・・
・磁気回路。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名！・
レンズ゛’ ｑａ−ｃ・・石隻矢回路２、
しンス°゛ホルタ゛ ｌθ ・ 支ネｈ１睨定部５
・・・車ＩＩ？ １３ ・・
・ へ′−スに・・軸受
７・・３４竹材
δ・・、バ違材
第３図
第４図
第５図The first question is a plan view of an objective lens driving device according to an embodiment of the present invention, the part in FIG. 2) is a front view of the main part, FIG. 3 is a model diagram showing the functions of the objective lens drive device, FIG. 4 is a perspective view showing the conventional objective lens drive device, and FIG. Figures (~ are plan views of the same main parts,
FIG. 5(B) is a front view of the same main part. 1...lens, 2...lens holder,
3...Second movable part, 4a to 4d...
Leaf spring, 8... Spring material, 9a to 9C...
・Magnetic circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person!・
Lens ゛' qa-c... Ishimitsuya circuit 2,
Shinsu°゛Holter゛lθ ・ Support h1 viewing part 5
...Car II? 13...
・ At the base... bearing 7... 34 bamboo material δ..., bamboo material Fig. 3 Fig. 4 Fig. 5
Claims (4)
み取る装置の対物レンズとレンズホルダよりなる第１の
可動部と、軸あるいはピボット部により前記記録媒体面
に平行かつ半径方向であるトラッキング方向にのみ回動
自在に固定された第２の可動部とを、前記軸あるいはピ
ボット部に全可動部の重心が位置するように構成し、か
つ前記第１の可動部のみ、前記記録媒体面に対して垂直
な光軸方向であるフォーカス方向に可動可能になるよう
に前記第１、第２の可動部とを連結する１個あるいは複
数個の板バネと、前記第１、第２の可動部がトラッキン
グ方向に運いた後、元の位置に復帰するための１個ある
いは複数個のバネ材と、前記第１の可動部をフォーカス
方向に駆動する１個あるいは複数個のフォーカス用磁気
回路と、前記第１、第２の可動部をトラッキング方向へ
駆動する１個あるいは複数個のトラッキング用磁気回路
とを備えたことを特徴とする対物レンズ駆動装置。(1) A first movable part consisting of an objective lens and a lens holder of a device for optically writing or reading information on a recording medium, and a tracking direction that is parallel to the surface of the recording medium and in a radial direction by means of a shaft or pivot part. and a second movable part which is rotatably fixed only to the center of gravity of the entire movable part is located at the axis or pivot part, and only the first movable part is fixed to the recording medium surface. one or more leaf springs connecting the first and second movable parts so that the first and second movable parts are movable in the focus direction, which is the vertical optical axis direction; one or more spring members for returning to the original position after being moved in the tracking direction; one or more focusing magnetic circuits for driving the first movable part in the focusing direction; An objective lens driving device comprising one or more tracking magnetic circuits that drive the first and second movable parts in the tracking direction.
等の弾性材を接着したことを特徴とする特許請求の範囲
第１項記載の対物レンズ駆動装置。(2) The objective lens driving device according to claim 1, wherein an elastic material such as rubber is bonded to at least one of the front and back surfaces of the leaf spring.
前記第１の可動部の重心とを一致させ、かつ、前記第１
の可動部重心のトラッキング方向延長線上で前記板バネ
により支持したことを特徴とする特許請求の範囲第２項
記載の対物レンズ駆動装置。(3) The center of the driving force generated from the focusing magnetic circuit is aligned with the center of gravity of the first movable part, and
3. The objective lens driving device according to claim 2, wherein the objective lens driving device is supported by the plate spring on an extension line in the tracking direction of the center of gravity of the movable part.
のトラッキング用磁気回路と、第２の可動部をトラッキ
ング方向へ駆動する第２のトラッキング用磁気回路とを
有し、各可動部重心に与える各磁気回路の駆動力が、ほ
ぼ等しくなるように前記各磁気回路を調整したことを特
徴とする特許請求の範囲第３項記載の対物レンズ駆動装
置。(4) The first movable part that drives the first movable part in the tracking direction.
and a second tracking magnetic circuit that drives the second movable part in the tracking direction, and the driving force of each magnetic circuit applied to the center of gravity of each movable part is approximately equal. 4. The objective lens driving device according to claim 3, wherein each magnetic circuit is adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60022220A JPH0786980B2 (en) | 1985-02-07 | 1985-02-07 | Objective lens drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60022220A JPH0786980B2 (en) | 1985-02-07 | 1985-02-07 | Objective lens drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61182642A true JPS61182642A (en) | 1986-08-15 |
| JPH0786980B2 JPH0786980B2 (en) | 1995-09-20 |
Family
ID=12076713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60022220A Expired - Lifetime JPH0786980B2 (en) | 1985-02-07 | 1985-02-07 | Objective lens drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0786980B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5136558A (en) * | 1989-06-20 | 1992-08-04 | Applied Magnetics Corporation | Two axis electromagnetic actuator |
| JPH04232622A (en) * | 1990-12-28 | 1992-08-20 | Nec Home Electron Ltd | Separate type optical head |
| US5177640A (en) * | 1991-10-08 | 1993-01-05 | Applied Magnetics Corporation | Two-axis moving coil actuator |
| US5243584A (en) * | 1991-03-23 | 1993-09-07 | Hyundai Electronics Industries Co., Ltd. | Stabilized optical pick-up unit for use in a disk player |
| US5265079A (en) * | 1991-02-15 | 1993-11-23 | Applied Magnetics Corporation | Seek actuator for optical recording |
| US5313332A (en) * | 1990-11-16 | 1994-05-17 | Applied Magnetics Corporation | Flexure suspension for two axis actuator |
| US5381288A (en) * | 1992-06-16 | 1995-01-10 | Applied Magnetics Corporation, Inc. | Center moment suspension assembly |
| US5461598A (en) * | 1992-09-18 | 1995-10-24 | Eastman Kodak Company | Balanced focus actuator for an optical storage system |
| US6621770B2 (en) * | 1997-08-08 | 2003-09-16 | Pioneer Electronic Corporation | Optical pickup having a position-adjustable objective lens |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58169345A (en) * | 1982-03-31 | 1983-10-05 | Hitachi Ltd | Driving device of objective lens |
| JPS59178631A (en) * | 1983-03-29 | 1984-10-09 | Toshiba Corp | Optical pickup |
-
1985
- 1985-02-07 JP JP60022220A patent/JPH0786980B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58169345A (en) * | 1982-03-31 | 1983-10-05 | Hitachi Ltd | Driving device of objective lens |
| JPS59178631A (en) * | 1983-03-29 | 1984-10-09 | Toshiba Corp | Optical pickup |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5136558A (en) * | 1989-06-20 | 1992-08-04 | Applied Magnetics Corporation | Two axis electromagnetic actuator |
| US5313332A (en) * | 1990-11-16 | 1994-05-17 | Applied Magnetics Corporation | Flexure suspension for two axis actuator |
| JPH04232622A (en) * | 1990-12-28 | 1992-08-20 | Nec Home Electron Ltd | Separate type optical head |
| US5265079A (en) * | 1991-02-15 | 1993-11-23 | Applied Magnetics Corporation | Seek actuator for optical recording |
| US5243584A (en) * | 1991-03-23 | 1993-09-07 | Hyundai Electronics Industries Co., Ltd. | Stabilized optical pick-up unit for use in a disk player |
| JPH0644598A (en) * | 1991-03-23 | 1994-02-18 | Hyundai Electron Ind Co Ltd | Optical pickup device for optical disk drive |
| US5177640A (en) * | 1991-10-08 | 1993-01-05 | Applied Magnetics Corporation | Two-axis moving coil actuator |
| US5381288A (en) * | 1992-06-16 | 1995-01-10 | Applied Magnetics Corporation, Inc. | Center moment suspension assembly |
| US5461598A (en) * | 1992-09-18 | 1995-10-24 | Eastman Kodak Company | Balanced focus actuator for an optical storage system |
| US6621770B2 (en) * | 1997-08-08 | 2003-09-16 | Pioneer Electronic Corporation | Optical pickup having a position-adjustable objective lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0786980B2 (en) | 1995-09-20 |
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