JPS59223946A - Objective lens driving device - Google Patents
Objective lens driving deviceInfo
- Publication number
- JPS59223946A JPS59223946A JP9973983A JP9973983A JPS59223946A JP S59223946 A JPS59223946 A JP S59223946A JP 9973983 A JP9973983 A JP 9973983A JP 9973983 A JP9973983 A JP 9973983A JP S59223946 A JPS59223946 A JP S59223946A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- coil
- tracking direction
- switch
- tracking
- 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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08517—Methods for track change, selection or preliminary positioning by moving the head with tracking pull-in only
-
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、デスク状記録媒体に高密度なデジタル信号を
記録させた情報トランクに光スポットを投影させて光学
的に情報を読みとる方式の再生装置において、情報トラ
ックの信号に対して光スポットの位２ ・
置を正確に補正制御するために、対物レンズの位置をデ
ィスク面に対して、相対的に制御す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 a reproducing apparatus that optically reads information by projecting a light spot onto an information trunk in which high-density digital signals are recorded on a disk-shaped recording medium. The present invention relates to an objective lens driving device that controls the position of an objective lens relative to a disk surface in order to accurately correct and control the position of a light spot with respect to a signal of an information track.
より詳しくは、たとえばディスクの回転中心に対する情
報トラックの偏心量、すなわち、ディスクの径方向の相
対的位置ズレを補正するトラッキング制御と、ディスク
自体のソリ、及びディスクの回転運動に伴い相対的に発
生するディスク面の振れに対して対物レンズと情報トラ
ック位置との距離を制御す第１図は対物レンズ駆動装置
の支持及び駆動系の構成図であり、従来例と本発明に共
通する。第２図はその駆動部の分解斜視図である。In more detail, for example, the amount of eccentricity of the information track with respect to the center of rotation of the disk, that is, the tracking control that corrects the relative positional deviation in the radial direction of the disk, the warping of the disk itself, and the relative occurrence due to the rotational movement of the disk. FIG. 1 is a block diagram of the support and drive system of the objective lens drive device, which is common to the conventional example and the present invention. FIG. 2 is an exploded perspective view of the drive section.
対物レンズ１はホルダー２に接着されており、ホルダー
２にフォーカス方向の駆動コイル３が巻かれ、両側面に
は２対のトラッキング方向の駆動コイル４が接着されて
いる。The objective lens 1 is bonded to a holder 2, a focusing direction drive coil 3 is wound around the holder 2, and two pairs of tracking direction drive coils 4 are bonded to both sides.
ゴムチューブ５に被覆された４本の金Ｊ、線６は一端が
ホルダー４の穴に嵌まって、ホルダー４に貼り付けられ
たプリント基板７にノ・ノダ付されており。One end of the four gold wires 6 coated on the rubber tube 5 is fitted into a hole in the holder 4, and is attached to a printed circuit board 7 attached to the holder 4.
他端はプリント基板８にハンダ付けされている。このプ
リント基板８は、ネジ９を介して基台１０に固着されて
いる。基台１０は磁性材料でできており、２個のマグネ
ットが接着され磁気回路を構成している。The other end is soldered to the printed circuit board 8. This printed circuit board 8 is fixed to a base 10 via screws 9. The base 10 is made of a magnetic material, and two magnets are adhered to form a magnetic circuit.
プリント基板７にはフォーカス方向の駆動コイル３の両
端とトラッキング方向の駆動コイル４０両端がハンダ付
けされており、金属線６とそれぞれ電気的に結合されて
いる。Both ends of the drive coil 3 in the focus direction and both ends of the drive coil 40 in the tracking direction are soldered to the printed circuit board 7, and are electrically coupled to the metal wires 6, respectively.
プリント基板８にはリード線１２がノ・ノダ付けされて
おり、金属線６と電気的に結合されている。A lead wire 12 is attached to the printed circuit board 8 and is electrically coupled to the metal wire 6.
リード線１２に電流を供給すると金属線６を介してフォ
ーカス方向の、駆動コイル３あるいはトラッキング方向
の駆動コイル４に電流が流れ、それぞれの方向に移動す
る。When a current is supplied to the lead wire 12, the current flows through the metal wire 6 to the drive coil 3 in the focus direction or the drive coil 4 in the tracking direction, causing movement in the respective directions.
ゴムチューブ５は、可動部の自由振動を減衰させるため
に、金属線６に被覆しているものである。The rubber tube 5 covers the metal wire 6 in order to damp the free vibration of the movable part.
ここで、ディスク上のある情報トラックからある情報ト
ラックへ、多数の情報トラックを飛び越して対物レンズ
を、助かずためには、一時トラッキング制御を切り、デ
ィスクの径方向のトラバース送りによって対物レンズ１
駆動装置を動かす必要がある。これを短時間で行なうた
めには、トラバース送りの急動作、急停止が必要となる
が、ｌ・ラバースが急停止したとき、対物レンズ駆動装
置の可動部はトラッキング方向に自由振動する。正確に
目的の情報トラック上へ対物レンズを持−て行くために
は、この自由振動を速く減衰させる必要がある。In order to move the objective lens from one information track to another on the disk by skipping over many information tracks, temporarily turn off the tracking control and move the objective lens by traversing the disk in the radial direction.
It is necessary to move the drive unit. In order to do this in a short time, it is necessary to make a sudden movement and stop of the traverse feed, but when the l-rubber suddenly stops, the movable part of the objective lens drive device freely vibrates in the tracking direction. In order to accurately bring the objective lens onto the desired information track, it is necessary to quickly attenuate this free vibration.
第３図は従来例の対物レンズ駆動装置の制御用電源部の
回路図であり、４はトラッキング方向の駆動コイル、１
１けマグネット、１３は電源用アンプ、１４はスイッチ
、１５は抵抗である。FIG. 3 is a circuit diagram of a control power supply unit of a conventional objective lens drive device, in which 4 is a tracking direction drive coil, 1
1 is a magnet, 13 is a power amplifier, 14 is a switch, and 15 is a resistor.
ディスク上で、ある目的の情報トラックへ対物レンズを
移動させるために、スイッチ１４を切ってトラッキング
制御を切り、トラバースのえ・動作、急停止をすると、
この従来の構成では、スイッチ１４が賢
切られているとき、トラッキング方向の駆動コイル４は
開いているのと同じなので、コイル４がマグネット１１
の作る磁界中で自由振動することによって起電力を発生
しても、コイル４が開いているため、コイル４には電流
が流れず、コイル４になんら力がかからない。In order to move the objective lens to a certain target information track on the disk, when the switch 14 is turned off to turn off the tracking control, and the traverse movement and sudden stop are performed,
In this conventional configuration, when the switch 14 is turned off, the driving coil 4 in the tracking direction is the same as being open, so that the coil 4 is connected to the magnet 11.
Even if an electromotive force is generated by free vibration in the magnetic field created by the coil 4, since the coil 4 is open, no current flows through the coil 4, and no force is applied to the coil 4.
このために、この自由振動を減衰させるために、径０．
２ｆｆｆｆの金属線に対して、径１．６朋以上のゴムチ
ューブを被覆していたが、金属線６の径に対して太めの
ゴムチューブを用いると、ゴムチューブを含めた金属線
６の支持部材が硬くなり、対物レンズ、駆動装置の効率
が下がるばかりか、金属線６に対するゴムチューブの割
合が増え、対物レンズ駆動装置の温度特性が悪化すると
ともに、ゴムの疲労変形により対物レンズが傾いたりす
るという問題点を有していた。For this reason, in order to damp this free vibration, a diameter of 0.
A rubber tube with a diameter of 1.6 mm or more was used to cover a metal wire of 2ffff, but if a rubber tube that is thicker than the diameter of the metal wire 6 is used, it will be difficult to support the metal wire 6 including the rubber tube. Not only will the parts become hard, reducing the efficiency of the objective lens and drive device, but the ratio of the rubber tube to the metal wire 6 will increase, worsening the temperature characteristics of the objective lens drive device, and the objective lens may tilt due to fatigue deformation of the rubber. There was a problem with this.
発明の目的
本発明は上記の従来の問題点を解消するもので、可動部
のトラッキング方向の自由振動をすみやかに減衰させる
対物レンズ駆動装置を提供するものである。OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides an objective lens driving device that quickly damps free vibrations of a movable part in the tracking direction.
発明の構成
本発明は、トラッキングとフォーカス方向駆動用６ ・
・
の２つのコイルと、トラッキング方向の駆動用コイルを
接断するスイッチを持つもので、トラッキング制御を切
った時に上記スイッチによりトラッキング方向駆動用コ
イルを短絡し、対物し／ズ駆動装置の可動部のトラッキ
ング方向の自由振動を電磁気的にすみやかに減衰させる
ものである。この本発明によれば、ゴムによる制動が必
要ないのでゴムチューブを除くことができるばかりでな
く、対物レンズ駆動装置の効率が上がり、温度特性がな
くなり、かつ疲労変形による信頼性も大幅に向上する。Structure of the Invention The present invention provides a mechanism for driving in tracking and focus directions.
・It has two coils and a switch that connects and disconnects the tracking direction driving coil.When the tracking control is turned off, the tracking direction driving coil is short-circuited by the switch, and the movable part of the objective lens/zoom drive device is The free vibration in the tracking direction is electromagnetically damped quickly. According to the present invention, there is no need for rubber braking, which not only makes it possible to eliminate the rubber tube, but also improves the efficiency of the objective lens drive device, eliminates temperature characteristics, and greatly improves reliability due to fatigue deformation. .
さらに、この減衰効果は、大きいので、ディスク上の目
的のトラックへ対物し／ズを、短時間で持っていくこと
ができ、この対物レンズ駆動装置を備えた光学式再生装
置の操作性を大幅に向上させる。Furthermore, since this attenuation effect is large, the objective lens can be brought to the desired track on the disk in a short time, greatly improving the operability of an optical playback device equipped with this objective lens drive device. to improve.
実施例の説明
以下、本発明の一実施例について第１図、第２図および
第４図を用いて、従来の装置と異なる点につき説明する
。ディスク上で、ある目的の情報トラックへ対物レンズ
を短時間で持っていくために、トラッキング制御を切り
、トラバースを急動作、急制動させると、対物レンズ駆
動装置の対物レンズ１とホルダー２とコイル３，４が一
体となってトラ・ノキング方向に自由振動する。このと
き、第４図において、トラソギング方向の駆動コイル４
が、マグネット１１の作る磁界の中で自由振動するＯこ
こで、スイッチ１４は、トラッキング制御を切ると同時
にトラソギング方向の駆動コイル４０両端を短絡するの
で、ドラッギング方向の駆動コイル４とマグネット１１
の相対振動により起電されて電流が流れる。この電流は
コイル４の内部抵抗によって熱になり、自由振動の運動
エネルギーが熱エネルギーに変換されるため、自由振動
は、すみやかに減衰する。なお、この実施例では、スイ
ッチとして機械スイッチを示したが、トランジスタ等を
用いた半導体スイッチでもよい。DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1, 2, and 4, with respect to its differences from conventional devices. In order to bring the objective lens to a certain desired information track on the disk in a short time, when the tracking control is turned off and the traverse is suddenly operated and braked, the objective lens 1, holder 2, and coil of the objective lens drive device are 3 and 4 together freely vibrate in the knocking direction. At this time, in FIG. 4, the drive coil 4 in the trussogging direction is
oscillates freely in the magnetic field created by the magnet 11. Here, the switch 14 turns off the tracking control and at the same time shorts both ends of the drive coil 40 in the trasogging direction, so that the drive coil 4 and the magnet 11 in the dragging direction
An electric current flows due to electromotive force due to the relative vibration of the This current turns into heat due to the internal resistance of the coil 4, and the kinetic energy of free vibration is converted into thermal energy, so that the free vibration is quickly attenuated. In this embodiment, a mechanical switch is shown as the switch, but a semiconductor switch using a transistor or the like may also be used.
発明の効果
以」−のように本発明によれば、対物レンズ駆動装置の
可動部の自由振動が電磁的にすみやかに減衰する。この
ため、ゴムによる制動を大きくする必要がないので、コ
ンプライアンスが下がり対物レンズ駆動装置の効率が上
がる。寸だ、ゴムがないので、ゴムの温度によるコンブ
シイアンス変化が々く温度特性が少なくなる。かつ疲労
変形による信頼性も大幅に向上する。さらにこの減衰効
果は、大きいので、ディスク上の目的のトラックの対物
レンズを、短時間で持っていくことができ、光学式再生
装置の操作性を大幅に向上させるなど、数々の優れた効
果を得ることのできる対物レンズ駆動装置を実現できる
ものである。According to the present invention, the free vibration of the movable part of the objective lens driving device is quickly electromagnetically attenuated as described in the following. For this reason, there is no need to increase the damping by the rubber, so the compliance is reduced and the efficiency of the objective lens driving device is increased. In fact, since there is no rubber, the combuciance changes greatly depending on the temperature of the rubber, resulting in less temperature characteristics. Moreover, reliability due to fatigue deformation is also greatly improved. Furthermore, since this attenuation effect is large, it is possible to bring the objective lens to the desired track on the disc in a short period of time, which greatly improves the operability of optical playback devices, and has many other excellent effects. This makes it possible to realize an objective lens driving device that can be obtained.
第１図は従来例及び本発明に共通の対物レンズ駆動装置
の支持及び駆動系の構成図、第２図はその駆動部の分解
斜視図、第３図は従来の対物レンズ駆動装置の駆動電源
部の回路図、第４図は、本発明の一実施例における駆動
電源部の回路図である０
１ ・・・対物レンズ、２・・・・・ホルダー、３・・
・・・・フォーカス方向の駆動コイル、４・・・・・・
トラ・ノキング方向の駆動コイル、５・・・・・・ゴム
チューブ、６・・・・・・金属線、７・・・・・・プリ
ント基板、８・・・・・・プリント基板、９・・・・・
ネジ、１０・・・・・・基台、１１ ・・マグネット、
１２・・・・リード線、１３・・・・・アンプ、１４・
・・・・スイッチ。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
１
第２図
４
第３図Fig. 1 is a configuration diagram of the support and drive system of the objective lens drive device common to the conventional example and the present invention, Fig. 2 is an exploded perspective view of the drive unit, and Fig. 3 is the drive power supply of the conventional objective lens drive device. FIG. 4 is a circuit diagram of a drive power supply section in an embodiment of the present invention.01...objective lens,2...holder,3...
... Drive coil in focus direction, 4...
Drive coil in the tracking/knocking direction, 5...Rubber tube, 6...Metal wire, 7...Printed circuit board, 8...Printed circuit board, 9.・・・・・・
Screw, 10...Base, 11...Magnet,
12... Lead wire, 13... Amplifier, 14...
····switch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1 Figure 2 4 Figure 3
Claims (1)
し、揺動自在に支持された対物レンズを互に直交するフ
ォーカス及びトラッキング方向に駆動するように構成す
るとともに、上記トラッキング方向の対物レンズ駆動用
のコイルにスイッチを接続し、上記対物レンズの急停止
時に、上記スイッチにより上記トラッキング方向の対物
レンズ駆動用のコイルの両端を短絡し、対物レンズのト
ラッキング方向の振動を電磁気的に減衰させることを特
徴とする対物レンズ駆動装置。A current is applied to a coil for driving an objective lens placed in a magnetic field to drive the swingably supported objective lens in focusing and tracking directions perpendicular to each other. A switch is connected to the coil for driving the objective lens, and when the objective lens suddenly stops, the switch shorts both ends of the coil for driving the objective lens in the tracking direction, electromagnetically suppresses the vibration of the objective lens in the tracking direction. An objective lens driving device characterized by attenuation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9973983A JPS59223946A (en) | 1983-06-03 | 1983-06-03 | Objective lens driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9973983A JPS59223946A (en) | 1983-06-03 | 1983-06-03 | Objective lens driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59223946A true JPS59223946A (en) | 1984-12-15 |
Family
ID=14255388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9973983A Pending JPS59223946A (en) | 1983-06-03 | 1983-06-03 | Objective lens driving device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59223946A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61236033A (en) * | 1985-04-10 | 1986-10-21 | Matsushita Electric Ind Co Ltd | Optical disk device |
| JPH0266739A (en) * | 1988-09-01 | 1990-03-06 | Pioneer Electron Corp | Optical pickup device |
-
1983
- 1983-06-03 JP JP9973983A patent/JPS59223946A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61236033A (en) * | 1985-04-10 | 1986-10-21 | Matsushita Electric Ind Co Ltd | Optical disk device |
| JPH0266739A (en) * | 1988-09-01 | 1990-03-06 | Pioneer Electron Corp | Optical pickup device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS61208641A (en) | Optical information recording and reproducing device | |
| KR20030025623A (en) | Apparatus for controlling of lens holder in pick-up | |
| JPS6118812B2 (en) | ||
| US7203136B2 (en) | Optical pickup actuator capable of performing focusing, tracking and tilting operations | |
| JPH0521701Y2 (en) | ||
| JPS59223946A (en) | Objective lens driving device | |
| JPS58182140A (en) | Objective lens driving device | |
| JPH0514335Y2 (en) | ||
| WO2001013368A1 (en) | Device for driving object lens | |
| JP2857225B2 (en) | Optical information recording / reproducing device | |
| JPS6076039A (en) | Objective lens driver | |
| JP2595712B2 (en) | Optical recording / reproducing device | |
| JP2897090B2 (en) | Objective lens drive | |
| JPH038129A (en) | Objective lens driving device | |
| JP2656081B2 (en) | Objective lens drive | |
| JP2749614B2 (en) | Objective lens drive | |
| JPH0416861B2 (en) | ||
| JPS6182339A (en) | Pickup device | |
| JPH0313863Y2 (en) | ||
| JP2592055B2 (en) | Optical pickup device | |
| JPH1011776A (en) | Optical pickup device | |
| TW200411650A (en) | Optical pickup actuator and optical recording and/or reproducing apparatus and method for the same | |
| JPS63122029A (en) | Objective lens driver | |
| JPH01179122A (en) | Vibration mirror device | |
| JPH0447900B2 (en) |