JPS63167433A - Objective lens driving device - Google Patents

Objective lens driving device

Info

Publication number
JPS63167433A
JPS63167433A JP31024186A JP31024186A JPS63167433A JP S63167433 A JPS63167433 A JP S63167433A JP 31024186 A JP31024186 A JP 31024186A JP 31024186 A JP31024186 A JP 31024186A JP S63167433 A JPS63167433 A JP S63167433A
Authority
JP
Japan
Prior art keywords
objective lens
lens
lens holder
supporting body
magnetic
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
Application number
JP31024186A
Other languages
Japanese (ja)
Inventor
Seiji Hoshi
清治 星
Shigeru Inagaki
滋 稲垣
Atsuyori Nakajima
中嶋 淳順
Hironori Yamamoto
浩令 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP31024186A priority Critical patent/JPS63167433A/en
Publication of JPS63167433A publication Critical patent/JPS63167433A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To prevent a lens from being fluctuated at the time of accessing at high speed and to fix the lens at a constant position, by detecting the change quantity of an objective lens supporting body with a magnetic sensor, and supplying a control signal corresponding to the signal to a tracking coil. CONSTITUTION:An objective lens 1 is fixed on the objective lens supporting body 2, and the supporting body 2 is fitted in a guide shaft 6. hen the supporting body 2 is rotated centering the shaft 6, the magnetic sensors 10 provided on the supporting body 2 are also displaced, and a difference is generated between the outputs of two sensors 10. By detecting the difference, it is possible to obtain a signal corresponding to a travel quantity. Therefore, it is possible to detect the displaced quantity of the lens 1 due to the deformation of the supporting body 2 or play between the shaft 6 and a reception part generated when the objective lens device accesses at high speed. By supplying the control signal corresponding to the signal to the tracking coil, it is possible to prevent the lens from being fluctuated, and to fix the lens at the constant position.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は光により微細な信号の読み出し又は書き込み
のための光学ヘッドに係り、例えばCDプレーヤ、光フ
ァイル装置等に用いられる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 Industrial Application] The present invention relates to an optical head for reading or writing minute signals using light, and relates to an objective lens drive device used for example in a CD player, an optical file device, etc. It is something.

〔発明の概要〕[Summary of the invention]

CDプレーヤや光ファイル装置等で、対物レンズを一軸
方向或いは二軸方向に駆動する対物レンズ駆動装置に磁
気回路と磁気センサとを備えて対物レンズの位置をモニ
タすることにより、高速アクセス時の対物レンズのふら
つきをなくして即座に情報が読み込めるようにしたり、
又対物レンズの動きを最適状態で制御できるようにする
In CD players, optical file devices, etc., the objective lens drive device that drives the objective lens in one or two axes is equipped with a magnetic circuit and a magnetic sensor to monitor the position of the objective lens. Eliminate lens wobbling so that information can be read instantly,
Also, the movement of the objective lens can be controlled in an optimal state.

〔従来の技術〕[Conventional technology]

第2図Aは従来の動物レンズ駆動装置の上面図、同図B
はそのE−E断面図である。第2図Aで対物レンズ1は
対物レンズ保持体2に固定され、同じく2に固定された
フォーカスコイル3及び4個のトラッキングコイル4が
ヨーク7及び磁石8からなる磁気間隙中に置かれ、2は
ガイド軸6に嵌合している。対物レンズ保持体2は図示
していないゴムばねや磁気ばね等により支持されている
Figure 2A is a top view of a conventional animal lens driving device, and Figure 2B is a top view of the conventional animal lens driving device.
is a sectional view taken along line E-E. In FIG. 2A, an objective lens 1 is fixed to an objective lens holder 2, and a focus coil 3 and four tracking coils 4, which are also fixed to the objective lens holder 2, are placed in a magnetic gap formed by a yoke 7 and a magnet 8. is fitted into the guide shaft 6. The objective lens holder 2 is supported by a rubber spring, a magnetic spring, etc. (not shown).

フォーカスコイル3及びトラッキングコイル4に外部よ
り各々フォーカス信号、トラッキング信号を供給すると
、電磁気学的にガイド軸方向の力とガイド軸を中心とす
る偶力を発生し、対物レンズ保持体2を光軸方向(以下
フォーカス方向と記す)及び光軸と直交方向(以下ラジ
アル方向と記す)に動かすことができる。
When a focus signal and a tracking signal are supplied to the focus coil 3 and the tracking coil 4 from the outside, respectively, a force in the direction of the guide axis and a couple force centered on the guide axis are generated electromagnetically, and the objective lens holder 2 is aligned with the optical axis. direction (hereinafter referred to as the focus direction) and in a direction perpendicular to the optical axis (hereinafter referred to as the radial direction).

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上記のような対物レンズ駆動装置を光デイスク上のある
トランクから別のトラックへ高速アクセスした場合、対
物レンズ保持体の変形、ガイド軸と受部とのガタ等によ
り対物レンズ位置がずれてしまい正しい情報を読み込む
ためには再びアクセスをやり直さなければならず多大な
時間を費やしてしまう。
When the objective lens drive device as described above is accessed at high speed from one trunk to another on an optical disk, the objective lens position may shift due to deformation of the objective lens holder, play between the guide shaft and the receiving part, etc. In order to read the information, the access must be made again, which takes a lot of time.

〔問題点を解決するための手段〕[Means for solving problems]

上記問題を解決するためにこの発明は、磁石のみ又は磁
石とヨークからなる磁気回路とホール素子や磁気抵抗素
子等の磁気センサで対物レンズの位置を検出し、その信
号から対物レンズが常に定位置にあるようにトラッキン
グコイルに制1111信号を与える。
In order to solve the above problems, the present invention detects the position of the objective lens using a magnetic circuit consisting of only a magnet or a magnet and a yoke, and a magnetic sensor such as a Hall element or a magnetoresistive element, and uses the signal to ensure that the objective lens is always at a fixed position. Give the control signal 1111 to the tracking coil as shown in .

〔作用〕[Effect]

磁石から放射される磁束密度の分布は空間的に特定の形
状を持っており、その強さを磁気センサでモニタするこ
とにより位置及び基準点からの移動量を知ることができ
る。つまり位置や移動量に対応した信号が得られれば高
速アクセス時の対物レンズの振れをモニタすることがで
き、その信号に応じた制御信号をトラッキングコイルに
与えることにより対物レンズを定位置に固定することが
できる。
The distribution of magnetic flux density emitted from a magnet has a spatially specific shape, and by monitoring its strength with a magnetic sensor, the position and amount of movement from the reference point can be determined. In other words, if a signal corresponding to the position and amount of movement is obtained, it is possible to monitor the deflection of the objective lens during high-speed access, and by giving a control signal corresponding to that signal to the tracking coil, the objective lens is fixed in a fixed position. be able to.

〔実施例〕〔Example〕

以下に本発明の実施例を図面に基づいて説明する。第1
図Aは本発明の対物レンズ駆動装置の上図面、同図Bは
そのG−G断面図、同図Cは本発明の詳細な説明するた
めの図である。第1図Aで対物レンズ1は対物レンズ保
持体2に固定され、同じく2に固定されたフォーカスコ
イル3及び4個のトラッキングコイル4がヨーク7及び
磁石8からなる磁気間隙中に置かれ、2はガイド軸6に
嵌合している。対物レンズ保持体2には磁気センサlO
が2個固定されており、センサ磁石11がそれに対向し
て配置される。対物レンズ保持体2は図示されていない
ゴムばねや磁気ばね等により支持されている。フォーカ
スコイル3及びトラッキングコイル4に外部より各々フ
ォーカス信号、トラッキング信号を供給すると、電磁気
学的にガイド軸方向の力とガイド軸を中心とする偶力を
発生し、対物レンズ保持体2をフォーカス方向とラジア
ル方向に動かすことができる。磁気センサはセンサをi
3過する磁束に比例した信号を出力するため対物レンズ
保持体がガイド軸を中心として回転すると磁気センサ1
0も一緒に回転するためその位置の磁石密度を知ること
ができる。
Embodiments of the present invention will be described below based on the drawings. 1st
Figure A is a top view of the objective lens driving device of the present invention, Figure B is a sectional view taken along line GG, and Figure C is a diagram for explaining the present invention in detail. In FIG. 1A, an objective lens 1 is fixed to an objective lens holder 2, and a focus coil 3 and four tracking coils 4, which are also fixed to the objective lens holder 2, are placed in a magnetic gap formed by a yoke 7 and a magnet 8. is fitted into the guide shaft 6. The objective lens holder 2 has a magnetic sensor lO
Two of them are fixed, and the sensor magnet 11 is arranged opposite to them. The objective lens holder 2 is supported by a rubber spring, a magnetic spring, etc. (not shown). When a focus signal and a tracking signal are supplied to the focus coil 3 and the tracking coil 4 from the outside, respectively, a force in the direction of the guide axis and a couple force centered on the guide axis are generated electromagnetically, and the objective lens holder 2 is moved in the focus direction. can be moved in the radial direction. The magnetic sensor is
3. When the objective lens holder rotates around the guide shaft to output a signal proportional to the magnetic flux passing through the magnetic sensor 1.
0 also rotates, so you can know the magnet density at that position.

一般に磁石表面の磁束密度分布は第1図Cに示すような
形状をしており、磁気センサ10a、10bを磁束密度
曲線のほぼ直線部の位置に配置すると各々のセンサの出
力信号の大きさは等しくなるが、対物レンズ保持体がガ
イド軸を中心として回転すると磁気センサの位置も変化
し、例えば第1図Cに示した矢印のように動くとloa
の出力は増加し、10bの出力は減少するためその差を
検出すると移動量に対応した信号を得ることができる。
Generally, the magnetic flux density distribution on the surface of a magnet has a shape as shown in FIG. However, when the objective lens holder rotates around the guide axis, the position of the magnetic sensor also changes. For example, when it moves as shown by the arrow in Figure 1C, the loa
Since the output of 10b increases and the output of 10b decreases, by detecting the difference, a signal corresponding to the amount of movement can be obtained.

つまり対物レンズ駆動装置が高速アクセスした時に生ず
る対物レンズ保持体の変形、ガイド軸と受部とのガタ等
による対物レンズのずれ量を検出することができ、この
信号に対応した制御信号をトラッキングコイルに与える
ことにより対物レンズを定位置に固定することができる
In other words, it is possible to detect the amount of deviation of the objective lens due to deformation of the objective lens holder that occurs when the objective lens drive device accesses at high speed, play between the guide shaft and the receiving part, etc., and a control signal corresponding to this signal is sent to the tracking coil. The objective lens can be fixed in a fixed position by applying

本実施例の特徴は対物レンズの二輪方向への案内をガイ
ド軸に沿った摺動及び軸回りの回転により行なうという
点であり、対物レンズ保持体、コイル、磁気回路等の形
状、寸法、材質等に何ら拘束されるものではない。
The feature of this embodiment is that the objective lens is guided in the direction of the two wheels by sliding along the guide axis and rotating around the axis. etc., and is not restricted in any way.

第3図は磁気センサを配置した対物レンズ駆動装置の第
2実施例であるが、第3図Aは上面図、同図BはそのH
−H断面図である。本実施例も第1実施例と同じく対物
レンズを二輪方向に動かすものであるが、それを2組の
平行ばねで行なう点が大きく異なる。本実施例の構造は
第3図Aに示すように対物レンズ1が対物レンズ保持体
2に固定され、同じく2に固定されたフォーカスコイル
3及びトラッキングコイル4がヨーク7及び磁石8から
なる磁気間隙中に置かれ、2は平行ばね12及び13で
弾性的に支持される。12.13、は中継板18によっ
て結合されており、13の他端はヨークの一部に固定さ
れ、可動部の全重量を支えている。
Fig. 3 shows a second embodiment of the objective lens driving device in which a magnetic sensor is arranged. Fig. 3A is a top view, and Fig. 3B is its H.
-H sectional view. This embodiment also moves the objective lens in the direction of the two wheels, similar to the first embodiment, but differs greatly in that this is done using two sets of parallel springs. As shown in FIG. 3A, the structure of this embodiment is such that an objective lens 1 is fixed to an objective lens holder 2, and a focus coil 3 and a tracking coil 4, which are also fixed to the objective lens holder 2, are connected to a magnetic gap formed by a yoke 7 and a magnet 8. 2 is elastically supported by parallel springs 12 and 13. 12 and 13 are connected by a relay plate 18, and the other end of 13 is fixed to a part of the yoke to support the entire weight of the movable part.

対物レレズ保持体2には磁気センサ10が2個固定され
ており、センサ磁石11がそれに対向して配置される。
Two magnetic sensors 10 are fixed to the objective lens holder 2, and a sensor magnet 11 is arranged facing them.

フォーカスコイル3及びトラッキングコイル4に外部よ
り各々フォーカス信号、トラッキング信号を供給すると
、電磁気学的に第3図Bに示すF方向(フォーカス方向
)及び第3図Aに示すT方向(ラジアル方向)の力を発
生し、対物レンズ保持体は12及び13の平行ばねによ
り上記F方向及びT方向の二軸方向へ動くことができる
。従って対物レンズ保持体2に固定された磁気センサも
T方向へ動くので、第1実施例で述べたのと同じように
その移動量に対応した信号が得られ、その信号を処理し
て制御信号としてトラッキングコイルに与えることによ
り対物レンズを定位置に固定することができる。
When a focus signal and a tracking signal are supplied to the focus coil 3 and the tracking coil 4 from the outside, respectively, electromagnetically the F direction (focus direction) shown in FIG. 3B and the T direction (radial direction) shown in FIG. 3A are generated. A force is generated, and the objective lens holder can be moved in two axial directions, the F direction and the T direction, by means of parallel springs 12 and 13. Therefore, since the magnetic sensor fixed to the objective lens holder 2 also moves in the T direction, a signal corresponding to the amount of movement is obtained in the same way as described in the first embodiment, and the signal is processed to generate a control signal. By applying this to the tracking coil, the objective lens can be fixed at a fixed position.

本実施例の特徴は対物レンズの二輪方向への案内を2組
の平行ばねによって行なっているという点であり、対物
レンズ保持体、コイル、磁気回路等の形状、寸法、材質
等に何ら拘束されるものではない。
The feature of this embodiment is that the objective lens is guided in the direction of the two wheels by two sets of parallel springs, and is not restricted by the shape, size, material, etc. of the objective lens holder, coil, magnetic circuit, etc. It's not something you can do.

第4図は磁気センサを配置した対物レンズ駆動装置の第
3実施例であるが、第4図Aは上面図、同図BはそのJ
−J断面図である。本実施例も第1実施例と同じく対物
レンズを二輪方向に動かすものであるが、それを1組の
平行ばねによる並進運動と回転軸による回転で行なう点
が大きく異なる。本実施例の構造は第4図Aに示すよう
に対物レンズ1が対物レンズ保持体2に固定され、同じ
く2に固定されたフォーカスコイル3及びトラッキング
コイル4がヨーク7及び磁石8からなる磁気間隙中に置
かれ、2は平行ばね12、さらに軸受15に支持された
回転軸19に支持される。対物レンズ保持体は図示して
いないゴムばねや磁気ばね等により支持されて回転軸回
りの中立位置が設定されると共に、トラッキングバラン
サ14により回転中心回りの不つりあいかない構造にな
っている。
Fig. 4 shows a third embodiment of an objective lens drive device in which a magnetic sensor is arranged. Fig. 4A is a top view, and Fig. 4B is its J.
-J sectional view. This embodiment also moves the objective lens in the direction of the two wheels like the first embodiment, but it differs greatly in that this is done by translation by a pair of parallel springs and rotation by a rotation axis. As shown in FIG. 4A, the structure of this embodiment is such that an objective lens 1 is fixed to an objective lens holder 2, and a focus coil 3 and a tracking coil 4, which are also fixed to the objective lens holder 2, are connected to a magnetic gap formed by a yoke 7 and a magnet 8. 2 is supported by a parallel spring 12 and a rotating shaft 19 supported by a bearing 15. The objective lens holder is supported by a rubber spring, magnetic spring, etc. (not shown) to set a neutral position around the rotation axis, and has a structure in which a tracking balancer 14 prevents imbalance around the rotation center.

本実施例も第1実施例と同じく磁気センサ10が対物レ
ンズ保持体2に固定され、センサ磁石11がそれに対向
して配置される。
In this embodiment, as in the first embodiment, a magnetic sensor 10 is fixed to an objective lens holder 2, and a sensor magnet 11 is arranged opposite thereto.

フォーカスコイル3及びトラッキングコイル4に外部よ
り各々フォーカス信号、トラッキング信号を供給すると
、電磁気学的に第4図Bに示すF方向(フォーカス方向
)及び第4図Aに示すT方向(ラジアル方向)の力を発
生し、対物レンズ保持体は平行ばね12により前記F方
向へ、回転軸19により前記T方向へ動(ことができる
。従って磁気センサ10もT方向へ動くので、第1実施
例と同じようにその移動量に対応した信号が得られ、対
物レンズを定位置に固定することができる。
When a focus signal and a tracking signal are supplied to the focus coil 3 and the tracking coil 4 from the outside, respectively, electromagnetically the F direction (focus direction) shown in FIG. 4B and the T direction (radial direction) shown in FIG. 4A are generated. A force is generated, and the objective lens holder is moved in the F direction by the parallel spring 12 and in the T direction by the rotating shaft 19.Therefore, the magnetic sensor 10 also moves in the T direction, so it is the same as the first embodiment. Thus, a signal corresponding to the amount of movement can be obtained, and the objective lens can be fixed at a fixed position.

本実施例の特徴は対物レンズの二輪方向への案内を1組
の平行ばねによる並進運動と回転軸回りの回転によって
行なっているという点であり、対物レンズ保持体、コイ
ル、磁気回路等の形状、寸法、材質等に何ら拘束される
ものではない。
The feature of this embodiment is that the objective lens is guided in the direction of the two wheels by translational movement by a pair of parallel springs and rotation around the rotation axis, and the shape of the objective lens holder, coil, magnetic circuit, etc. , dimensions, materials, etc. are not restricted in any way.

以上説明したように本発明は種々の構造の対物レンブ駆
動装置に使用できるものであり、対物レンズを2軸方向
に動かす機構、手段等に関係なくあらゆるタイプのもの
に適応することができることは言うまでもない。さらに
対物レンズを1軸又は3軸方向に動かす場合も、磁気回
路の磁束分布と磁気センサの位置及び個数を選ぶことに
よりそれぞれの変化量を検出することができ、その信号
を処理することにより対物レンズを定位置に固定できる
ことはもちろん、その信号を微分し速度信号や加速度信
号としてコイルにフィードバンクすることにより対物レ
イズの動きを最適状態で制御することができる。
As explained above, the present invention can be used for objective lens drive devices with various structures, and it goes without saying that it can be applied to all types of objective lens drive devices regardless of the mechanism or means for moving the objective lens in two axial directions. stomach. Furthermore, even when moving the objective lens in one or three axis directions, the amount of change in each can be detected by selecting the magnetic flux distribution of the magnetic circuit and the position and number of magnetic sensors, and by processing the signals, the objective lens Not only can the lens be fixed in a fixed position, but the movement of the objective lens can also be optimally controlled by differentiating the signal and feeding it to the coil as a velocity signal or acceleration signal.

本実施例で磁気センサにはホール素子、磁気砥抗素子等
があり、素子の種類が限定されることはない。又本実施
例では磁気センサはすべて対物レンズ保持体に固定され
可動側となっているが、逆に磁気回路を対物レンズ保持
体に固定し磁気センサを外部に取付けて固定側にしても
原理的には本実施例と同じであり問題はない、磁気セン
サ用のセンサ磁石は本実施例のように新たに設ける以外
に、フォーカスコイルやトラッキングコイルを駆動する
磁気回路中に配置することもでき、部品点数を削減でき
る利点がある。
In this embodiment, the magnetic sensor includes a Hall element, a magnetic abrasion element, etc., and the type of element is not limited. Also, in this example, all magnetic sensors are fixed to the objective lens holder and are on the movable side, but in principle, it is also possible to fix the magnetic circuit to the objective lens holder and attach the magnetic sensor externally to make it the fixed side. is the same as this embodiment, and there is no problem.In addition to newly providing the sensor magnet for the magnetic sensor as in this embodiment, it can also be placed in the magnetic circuit that drives the focus coil and tracking coil. This has the advantage of reducing the number of parts.

〔発明の効果〕〔Effect of the invention〕

この発明は以上説明したように、対物レンズ保持体の変
化量を磁気センサで検出しその信号を適当な処理後コイ
ルにフィードバックすることにより、高速アクセス時の
対物レンズのふらつきをな(すことができ、又その信号
を微分して速度信号や加速度信号としてコイルにフィー
ドバックすれば対物レンズの動きを最適状態で制御する
ことができる。
As explained above, this invention prevents the objective lens from wobbling during high-speed access by detecting the amount of change in the objective lens holder using a magnetic sensor and feeding the signal back to the coil after appropriate processing. Moreover, if the signal is differentiated and fed back to the coil as a velocity signal or an acceleration signal, the movement of the objective lens can be controlled in an optimal state.

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

第1図Aは本発明の対物レンズ駆動装置の上面図、第1
図Bは第1図AのG−G断面図、第1図Cは本発明の詳
細な説明するための図、第2図Aは従来の対物レンズ駆
動装置の上面図、第2図Bは第2図AのE−E断面図、
第3図Aは本発明の第2実施例の上面図、第3図Bは第
3図AのH−H断面図、第4図Aは本発明の第3実施例
の上面図、第4図Bは第4図AのJ−J断面図である。 1・・・対物レンズ 2・・・対物レンズ保持体 3・・・フォーカスコイル 4・・・トラッキングコイル 6・ ・ ・ガイド軸 7・・・ヨーク 8・・・磁石 9・・・バランサ 10・・・磁気センサ 11・・・センサ磁石 12・・・平行ばね 13・・・平行ばね 14・・・トラッキングバランサ 15・・・軸受 16・・・軸受押え 17・・・軸受固定台 18 ・ ・ ・ 中継)反 19・・・回転軸 以上 本発明の対物[ンズ麗勲裟1の上面口 第 1 図 A 第1図AC7’+(、−G断面図 本宅り月の原工!?8兇σ月″4″ろとめの図第1 図
 C f足来の芦目勿しンス゛鳥区vJ8JEの上面図第2図
 A 第2図AのE−E断面図 第2図B 木宛明の第2実施例の上面図 翌3図A 第31mAのH−1−1+!’tit図第3図 B
FIG. 1A is a top view of the objective lens driving device of the present invention;
Figure B is a sectional view taken along line GG in Figure 1A, Figure 1C is a diagram for explaining the present invention in detail, Figure 2A is a top view of a conventional objective lens drive device, and Figure 2B is a diagram for explaining the present invention in detail. EE sectional view of Figure 2A,
3A is a top view of the second embodiment of the present invention, FIG. 3B is a sectional view taken along line HH in FIG. 3A, and FIG. Figure B is a sectional view taken along line JJ in Figure 4A. 1... Objective lens 2... Objective lens holder 3... Focus coil 4... Tracking coil 6... Guide shaft 7... Yoke 8... Magnet 9... Balancer 10...・Magnetic sensor 11...Sensor magnet 12...Parallel spring 13...Parallel spring 14...Tracking balancer 15...Bearing 16...Bearing retainer 17...Bearing fixing base 18 ・ ・ ・ Relay ) Reverse 19...Above the rotational axis The objective of the present invention [Top opening of the Reiko 1 Figure 1 Figure A Figure 1 AC7'+(,-G cross-sectional view The original construction of the moon!?8 兇σ月``4'' bottom view Figure 1 C f Ashigo's Ashime Mashinosu Toriku vJ8JE top view Figure 2 A Figure 2 E-E cross-sectional view of A Figure 2 B Wooden light No. 2 Top view of the embodiment, Figure 3A, 31mA H-1-1+!'tit diagram, Figure 3B

Claims (3)

【特許請求の範囲】[Claims] (1)対物レンズを保持し並進自在又は回転自在に支持
された対物レンズ保持体と、前記対物レンズ保持体を並
進運動又は回転運動させるための力を発生する駆動部と
、磁石のみ或いは磁石とヨークから成る磁気回路を備え
た対物レンズ駆動装置で、前記磁気回路中に少くとも1
個以上の磁気センサを配置しその出力を外部に取出した
ことを特徴とする対物レンズ駆動装置。
(1) An objective lens holder that holds an objective lens and is supported so as to be able to translate or rotate; a drive unit that generates a force for translationally or rotationally moving the objective lens holder; and a magnet alone or a magnet. An objective lens driving device comprising a magnetic circuit consisting of a yoke, wherein at least one magnetic circuit is provided in the magnetic circuit.
1. An objective lens driving device characterized in that more than one magnetic sensor is arranged and the output thereof is taken out to the outside.
(2)前記磁気センサは対物レンズ保持体に支持された
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 the magnetic sensor is supported by an objective lens holder.
(3)前記磁気回路は対物レンズ保持体に支持されたこ
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。
(3) The objective lens driving device according to claim 1, wherein the magnetic circuit is supported by an objective lens holder.
JP31024186A 1986-12-29 1986-12-29 Objective lens driving device Pending JPS63167433A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31024186A JPS63167433A (en) 1986-12-29 1986-12-29 Objective lens driving device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31024186A JPS63167433A (en) 1986-12-29 1986-12-29 Objective lens driving device

Publications (1)

Publication Number Publication Date
JPS63167433A true JPS63167433A (en) 1988-07-11

Family

ID=18002876

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31024186A Pending JPS63167433A (en) 1986-12-29 1986-12-29 Objective lens driving device

Country Status (1)

Country Link
JP (1) JPS63167433A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017152384A (en) * 2017-03-02 2017-08-31 住友化学株式会社 Core, separator roll, and method for producing separator roll

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017152384A (en) * 2017-03-02 2017-08-31 住友化学株式会社 Core, separator roll, and method for producing separator roll

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