JPH0341902B2 - - Google Patents
Info
- Publication number
- JPH0341902B2 JPH0341902B2 JP7554584A JP7554584A JPH0341902B2 JP H0341902 B2 JPH0341902 B2 JP H0341902B2 JP 7554584 A JP7554584 A JP 7554584A JP 7554584 A JP7554584 A JP 7554584A JP H0341902 B2 JPH0341902 B2 JP H0341902B2
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- elastic body
- tracking
- coil
- tangential
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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
- G11B7/081—Disposition or mounting of heads or light sources relatively to record carriers for time base error correction by moving the light beam
-
- 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
- G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking
-
- 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
- G11B7/0932—Details of sprung supports
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】
＜技術分野＞
本発明は、光学式デイスクプレーヤ等における
対物レンズの３次元駆動装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a three-dimensional driving device for an objective lens in an optical disc player or the like.
＜従来技術＞
光学式デイスクの再生装置は、光源から放射さ
れた光を、対物レンズによつて、記録デイスク上
のピツト列に集束させ、かつ、このピツト列に光
スポツトを正確に追従させ、デイスク面からの反
射光を光検出器で受光し、光量の変化を電気信号
に変換して情報を読み取り、再生するものであ
る。<Prior art> An optical disk reproducing device focuses light emitted from a light source onto a pit row on a recording disk using an objective lens, and causes a light spot to accurately follow this pit row. A photodetector receives reflected light from the disk surface, converts changes in the amount of light into electrical signals, reads and reproduces information.
たとえば、ビデオ・デイスク・プレーヤにおい
ては、このようにデイスクのピツト列に常に微少
なスポツトに集光させるためのフオーカス方向の
制御および、このスポツトを正確にピツト列に追
従させるためのトラツキング方向の制御が必要で
あり、かつ、デイスクの回転むらによる時間軸変
動を除去するためのタンジエンシヤル方向の制御
もまた必要である。このような、３方向の制御を
行なうための手段として、小型化の点で、対物レ
ンズを３次元に駆動する方法が有望である。 For example, in a video disc player, the focus direction is controlled so that the light is always focused on a minute spot on the pit row of the disc, and the tracking direction is controlled so that this spot accurately follows the pit row. It is also necessary to control the tangential direction to eliminate time axis fluctuations due to uneven rotation of the disk. As a means for performing such three-direction control, a method of driving the objective lens three-dimensionally is promising from the viewpoint of miniaturization.
しかしこの方法の場合、小型化できるが、反面
その支持方法が問題になつてくる。対物レンズを
３方向に駆動可能なように支持するためには、各
方向ごとに弾性体を配して、その方向のみ駆動可
能にする方法や、１つあるいは１対の弾性体を３
方向に駆動可能な形状にして、対物レンズを支持
する方法などが考えられる。前者の場合、高次の
共振が生じたり、大型になりやすいなどの問題が
あつて好ましくない。 However, although this method allows for miniaturization, the method of supporting it becomes a problem. In order to support the objective lens so that it can be driven in three directions, it is possible to arrange an elastic body in each direction so that it can be driven only in that direction, or to support the objective lens so that it can be driven in three directions.
Possible methods include supporting the objective lens by making it into a shape that can be driven in different directions. The former case is undesirable because it causes problems such as high-order resonance and a tendency to increase the size.
第４図は、特開昭58−48232号公報等で提案さ
れた、上下１対の弾性体で可動部を支持する３次
元駆動装置の例である。中心部に対物レンズ１を
設けた対物レンズ保持体２を、上下１対の十字形
の弾性体３，３で支持しており、たとえばトラツ
キング方向Ｘとタンジエンシヤル方向Ｙに同時に
動かそうとする場合、弾性体３の十字部両長さ方
向の圧縮、引張りを利用して、ダンピングをきか
せる構造になつている。しかし、この構造は動き
にくく、駆動に大きな力が必要となつている。 FIG. 4 is an example of a three-dimensional drive device that supports a movable part with a pair of upper and lower elastic bodies, which was proposed in Japanese Patent Application Laid-Open No. 58-48232. An objective lens holder 2 with an objective lens 1 provided at its center is supported by a pair of upper and lower cross-shaped elastic bodies 3, and when attempting to move it simultaneously in the tracking direction X and the tangential direction Y, for example, It has a structure in which damping is produced by utilizing compression and tension in both longitudinal directions of the cross section of the elastic body 3. However, this structure is difficult to move and requires a large amount of force to drive.
＜発明の目的＞
本発明は、上記のような欠点を解消すべく成さ
れたもので、中心部に対物レンズを設けた対物レ
ンズ保持体を、田の字形柔構造の弾性体で支持し
極力この弾性体のたわみを利用して３方向にダン
ピングをきかせる構造として、駆動の容易な３次
元駆動装置を提供するものである。<Purpose of the Invention> The present invention has been made in order to eliminate the above-mentioned drawbacks.The objective lens holder, in which the objective lens is provided in the center, is supported by an elastic body having a field-shaped flexible structure. The present invention provides a three-dimensional drive device that is easy to drive and has a structure that uses the deflection of the elastic body to apply damping in three directions.
＜実施例＞
以下、図面に従つて本発明の実施例を詳細に説
明する。<Examples> Examples of the present invention will be described in detail below with reference to the drawings.
第１図は一実施例を示す分解斜視図、第２図は
同平面図、第３図は第２図のＡ−Ａ断面図であ
る。 FIG. 1 is an exploded perspective view showing one embodiment, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view taken along the line AA in FIG. 2.
円筒状の対物レンズ保持体１１の中心穴には、
上方から対物レンズ１２が挿入され固定されると
ともに、下方からは、中心部に光の通過穴が開け
られたバランサ１３が挿入され固定されている。
また、対物レンズ保持体１１の上部にはフランジ
１４があり、そこに形成された４本のスリツト１
５に、くの字形に折り曲げられたトラツキングコ
イル１６とタンジエンシヤルコイル１７の一方の
うでを１対づつ挿入して計８個のコイルを取り付
け、さらにその外周にリング状のフオーカスコイ
ル１８を配置している。 In the center hole of the cylindrical objective lens holder 11,
An objective lens 12 is inserted and fixed from above, and a balancer 13 having a light passage hole in the center is inserted and fixed from below.
Further, there is a flange 14 on the upper part of the objective lens holder 11, and four slits 1 formed therein are provided.
5, a pair of tracking coils 16 and one arm of the tangential coil 17 bent in a dogleg shape are inserted to attach a total of eight coils, and a ring-shaped focus coil is attached to the outer circumference of the tracking coil 16 and one arm of the tangential coil 17. 18 are placed.
一方、磁気回路は、ヨークプレート１９、マグ
ネツト２０、つば付筒状ヨーク２１からなり、ヨ
ーク２１の筒部には４本のスリツト状切欠２２を
形成している。この磁気回路の空隙中に、フオー
カスコイル１８およびトラツキングコイル１６と
タンジエンシヤルコイル１７の往路２３，２４を
配し、それぞれの復路２５，２６は上記切欠２２
を通して空隙外に逃がしている。したがつて、フ
オーカスコイル１８、トラツキングコイル１６、
タンジエンシヤルコイル１７に適宜電流を流すこ
とにより、対物レンズ１２を、それぞれフオーカ
ス方向、トラツキング方向、タンジエンシヤル方
向に独立して駆動することができる。 On the other hand, the magnetic circuit consists of a yoke plate 19, a magnet 20, and a flange-shaped cylindrical yoke 21, and four slit-like notches 22 are formed in the cylindrical portion of the yoke 21. The outgoing paths 23 and 24 of the focus coil 18, the tracking coil 16, and the tangential coil 17 are arranged in the gap of this magnetic circuit, and the respective incoming paths 25 and 26 are connected to the notch 22.
It escapes through the air gap. Therefore, the focus coil 18, the tracking coil 16,
By passing an appropriate current through the tangential coil 17, the objective lens 12 can be independently driven in the focusing direction, tracking direction, and tangential direction.
ゴム等でできた弾性体２７は、対物レンズ保持
体１１を安定に支持するために上下１対あり、平
面形状は田の字形で、その中心部２８が対物レン
ズ保持体１１に、４ヶ所の角にあるピン２９がヨ
ークプレート１９あるいは筒状ヨーク２１に固定
される。そして、第２図に明らかなように、田の
字形弾性体２７の内側横うで３０と外枠横うで３
１は例えばタンジエンシヤル方向Ｙに、また内側
縦うで３２と外枠縦うで３３はトラツキング方向
Ｘに配置している。 The elastic body 27 made of rubber or the like has an upper and a lower pair in order to stably support the objective lens holder 11, and has a cross-shaped planar shape. Pins 29 at the corners are fixed to the yoke plate 19 or the cylindrical yoke 21. As is clear from FIG. 2, there are 30 on the inner side of the square-shaped elastic body 27 and 3 on the side of the outer frame.
1 is arranged in the tangential direction Y, and the inner longitudinal arm 32 and the outer frame longitudinal arm 33 are arranged in the tracking direction X, for example.
上述のような構造であり、フオーカス方向につ
いては、弾性体２７が薄形で、かつ、弾性体２７
のストロークが長いため容易にたわむことができ
る。一方、トラツキング方向駆動時は、内側・外
枠の横うで３０，３１がたわみ、タンジエンシヤ
ル方向駆動時には、内側・外枠の縦うで３２・３
３がたわむため、駆動が容易に行なえる。また、
トラツキング方向とタンジエンシヤル方向を同時
に駆動する場合も、主に外枠横、縦うで３１，３
３のたわみにより駆動を容易に実行できる。 The structure is as described above, and in the focus direction, the elastic body 27 is thin and the elastic body 27 is thin.
Because the stroke is long, it can be easily deflected. On the other hand, when driving in the tracking direction, 30 and 31 are bent at the horizontal beams of the inner and outer frames, and when driven in the tangential direction, 32 and 3 are bent at the vertical arms of the inner and outer frames.
3 is deflected, making it easy to drive. Also,
Even when driving in the tracking direction and the tangential direction at the same time, the 31, 3
Drive can be easily performed by the deflection of 3.
以上の如く弾性体２７は田の時形であつて且つ
柔構造となつている。 As described above, the elastic body 27 has a flat and flexible structure.
このように、上下一対の弾性体２７，２７によ
り、フオーカス、トラツキング、タンジエンシヤ
ルの３方向にダンピングをきかせながら、対物レ
ンズ保持体１１を支持しており、各方向に駆動す
る時には、弾性体２７，２７のうでがそれぞれの
動きに対応してたわむため、容易に駆動すること
ができる。 In this way, the pair of upper and lower elastic bodies 27, 27 supports the objective lens holder 11 while applying damping in three directions: focusing, tracking, and tangential. When driving in each direction, the elastic bodies 27, 27 Since the arms of 27 bend in response to each movement, it can be easily driven.
＜発明の効果＞
上述のように、本発明は、対物レンズ保持体を
田の字形柔構造の弾性体で支持し、容易に３方向
に駆動できる、有用な対物レンズの３次元駆動装
置が提供できる。<Effects of the Invention> As described above, the present invention provides a useful three-dimensional driving device for an objective lens in which the objective lens holder is supported by an elastic body having a square-shaped flexible structure and can be easily driven in three directions. can.
第１図は本発明の一実施例を示す分解斜視図、
第２図は同平面図、第３図は第２図のＡ−Ａ断面
図、第４図は従来例を示す分解斜視図である。
１１……対物レンズ保持体、１２……対物レン
ズ、１６……トラツキングコイル、１７……タン
ジエンシヤルコイル、１８……フオーカスコイ
ル、１９……ヨークプレート、２０……マグネツ
ト、２１……つば付筒状ヨーク、２７……弾性
体、２９……ピン、３０……内側横うで、３１…
…外枠横うで、３２……内側縦うで、３３……外
枠縦うで。
FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
FIG. 2 is a plan view of the same, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. 4 is an exploded perspective view showing a conventional example. 11... Objective lens holder, 12... Objective lens, 16... Tracking coil, 17... Tangential coil, 18... Focus coil, 19... Yoke plate, 20... Magnet, 21... cylindrical yoke with flange, 27... elastic body, 29... pin, 30... inner side beam, 31...
...Outer frame horizontal arm, 32...Inner vertical arm, 33...Outer frame vertical arm.
Claims (1)
体をフオーカス方向、トラツキング方向およびタ
ンジエンシヤル方向の計３方向に駆動することが
できる対物レンズの３次元駆動装置において、 前記対物レンズ保持体を、外枠４個所の角を非
可動部に固定する、田の字形柔構造の弾性体で支
持してなることを特徴とする対物レンズの３次元
駆動装置。[Scope of Claims] 1. A three-dimensional driving device for an objective lens capable of driving an objective range holder having an objective lens in the center in a total of three directions: a focusing direction, a tracking direction, and a tangential direction, comprising: A three-dimensional driving device for an objective lens, characterized in that a holder is supported by an elastic body having a box-shaped flexible structure that fixes four corners of an outer frame to a non-movable part.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7554584A JPS60219642A (en) | 1984-04-13 | 1984-04-13 | Three-dimensional driver for objective lens |
| US06/697,465 US4696566A (en) | 1984-02-08 | 1985-02-01 | Three-dimensional driving arrangement |
| GB08502904A GB2154023B (en) | 1984-02-08 | 1985-02-05 | Three-dimensional driving arrangement for objective lens |
| NL8500361A NL192147C (en) | 1984-02-08 | 1985-02-08 | Driving device for moving an objective lens. |
| US07/063,495 US4766584A (en) | 1984-02-08 | 1987-06-18 | Three-dimensional driving arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7554584A JPS60219642A (en) | 1984-04-13 | 1984-04-13 | Three-dimensional driver for objective lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60219642A JPS60219642A (en) | 1985-11-02 |
| JPH0341902B2 true JPH0341902B2 (en) | 1991-06-25 |
Family
ID=13579274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7554584A Granted JPS60219642A (en) | 1984-02-08 | 1984-04-13 | Three-dimensional driver for objective lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60219642A (en) |
-
1984
- 1984-04-13 JP JP7554584A patent/JPS60219642A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60219642A (en) | 1985-11-02 |
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