JPS63177323A - Objective lens driver - Google Patents
Objective lens driverInfo
- Publication number
- JPS63177323A JPS63177323A JP824287A JP824287A JPS63177323A JP S63177323 A JPS63177323 A JP S63177323A JP 824287 A JP824287 A JP 824287A JP 824287 A JP824287 A JP 824287A JP S63177323 A JPS63177323 A JP S63177323A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- base
- yorks
- yoke
- optical axis
- 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
- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 239000000696 magnetic material Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract description 2
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
この発明は、コンパクト・ディスク（ＣＤ）などの光学
的情報記録媒体から情報を光学的に読み出す光ピツクア
ップヘッドに用いられる対物レンズ駆動装置の改良に関
する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention is used in an optical pickup head that optically reads information from an optical information recording medium such as a compact disc (CD). This invention relates to improvements in objective lens driving devices.
（従来の技術）
光ピツクアップヘッドでは、レーザ光ビームスポットを
、光学的情報記録媒体の情報記録面および情報記録トラ
ックに追従させるために、対物レンズ駆動装置を備えて
いる。(Prior Art) An optical pickup head is equipped with an objective lens driving device in order to cause a laser beam spot to follow an information recording surface and an information recording track of an optical information recording medium.
一般に、この種の対物レンズ駆動装置は、永久磁石とヨ
ークとを有する磁気回路部と、電磁コイルとを有し、磁
気回路部のギャップに電磁コイルが配置される。電磁コ
イルは電流を流すことにより、磁気ギャップの磁束との
作用により電磁的に力を受けるため、電磁コイルに対物
レンズを固定することにより対物レンズを駆動すること
が可能となる。このような光ピツクアップヘッドの対物
レンズ駆動装置は、例えば特開昭５９−２２１８３９号
公報、実開昭６０−’１４０２３２号公報等で種々の構
成が提案されている。Generally, this type of objective lens driving device has a magnetic circuit section having a permanent magnet and a yoke, and an electromagnetic coil, and the electromagnetic coil is disposed in a gap between the magnetic circuit sections. When a current is passed through the electromagnetic coil, the electromagnetic coil receives an electromagnetic force due to the interaction with the magnetic flux of the magnetic gap. Therefore, by fixing the objective lens to the electromagnetic coil, it is possible to drive the objective lens. Various configurations of such an objective lens driving device for an optical pickup head have been proposed, for example, in Japanese Patent Application Laid-Open No. 59-221839 and Japanese Utility Model Application No. 60-'140232.
また、対物レンズの光軸をレーザビームの光軸と一致さ
せるための対物レンズの角度調整機構を設けることも知
られている。It is also known to provide an angle adjustment mechanism for the objective lens to align the optical axis of the objective lens with the optical axis of the laser beam.
（発明が解決しようとする問題点）
このような対物レンズ駆動装置には、ヨーク、永久磁石
、ヨークを保持する基台等が必要であり、部品点数が多
く、また各部品の位置決め精度が高精度に要求されるた
め、組立てが容易でない、あるいは組立て精度が悪い場
合には特性不良となる。(Problems to be Solved by the Invention) Such an objective lens driving device requires a yoke, a permanent magnet, a base for holding the yoke, etc., and requires a large number of parts, and the positioning accuracy of each part is high. Since precision is required, if assembly is not easy or the assembly accuracy is poor, the characteristics will be poor.
本発明は、このような事情に鑑みてなされたもので、組
立てが容易で、かつ特性が良好な対物レンズ駆動装置を
提供することを目的とする。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an objective lens driving device that is easy to assemble and has good characteristics.
［発明の構成コ
（問題点を解決するための手段）
この発明は、複数のコイルと１つの対物レンズを含む光
学系とを備えた可動体の前記複数のコイルに電気信号を
供給して、前記対物レンズを光学記録媒体の半径方向及
び垂直方向の２方向に駆動させる対物レンズ駆動装置に
おいて、
磁気回路を構成するヨークと、前記対物レンズの光軸を
角度調整を行なう角度調整機構と、対物レンズ駆動装置
の基台とを共通の部材で形成するとともに、これらを一
体に形成したことを特徴とする対物レンズ駆動Ｖ装置あ
る。[Configuration of the Invention (Means for Solving the Problems)] The present invention provides the following methods: supplying electrical signals to the plurality of coils of a movable body including a plurality of coils and an optical system including one objective lens; An objective lens drive device that drives the objective lens in two directions, a radial direction and a perpendicular direction of an optical recording medium, comprising: a yoke that constitutes a magnetic circuit; an angle adjustment mechanism that adjusts the angle of the optical axis of the objective lens; There is an objective lens drive V device characterized in that the base of the lens drive device and the base of the lens drive device are formed of a common member, and these are integrally formed.
（作 用）
磁気回路を構成するヨークと、対物レンズの光軸の傾き
調整を行なう角度調整機構と、対物レンズ駆動装置の基
台とを共通の部材で形成するとともに、これらを一体に
形成したことにより、コンパクトに対物レンズ駆動装置
が形成できる。また、対物レンズ駆動装置の組立ても容
易となる。(Function) The yoke that constitutes the magnetic circuit, the angle adjustment mechanism that adjusts the inclination of the optical axis of the objective lens, and the base of the objective lens drive device are formed from a common member, and these are formed integrally. As a result, a compact objective lens driving device can be formed. Furthermore, assembly of the objective lens driving device is also facilitated.
（実施例） 以下本発明を図面を参照して説明する。(Example) The present invention will be explained below with reference to the drawings.
第１図は本発明の一実施例の対物レンズ駆動装置に用い
られるヨークおよび基台を・示す斜視図、第２図は対物
レンズ駆動装置の全体を示す斜視図、第３図は分解斜視
図、第４図は平面図、第５図は第４図においてＡ−Ａ線
に沿っての断面図をそれぞれ示す。Fig. 1 is a perspective view showing a yoke and a base used in an objective lens drive device according to an embodiment of the present invention, Fig. 2 is a perspective view showing the entire objective lens drive device, and Fig. 3 is an exploded perspective view. , FIG. 4 is a plan view, and FIG. 5 is a sectional view taken along line A--A in FIG. 4.
以下、詳細について説明する。The details will be explained below.
さて、これらの図において、１１は磁性材で形成された
基台を示す。基台１１には２本のビン１１ａ、１１ｂが
植設され、また外側ヨーク２２ａ 、 ２２ｂ及び内側
ヨーク２１ａ 、 ２１ｂが設けられている。また基台
１１の底面には角度調整機構２５が形成されている。Now, in these figures, 11 indicates a base made of a magnetic material. Two bottles 11a and 11b are planted on the base 11, and outer yokes 22a and 22b and inner yokes 21a and 21b are provided. Further, an angle adjustment mechanism 25 is formed on the bottom surface of the base 11.
ピン１１ａ１１１ｂには可動部３Ｇの支持機構４０が嵌
入、固定される。The support mechanism 40 of the movable part 3G is fitted into and fixed to the pin 11a111b.
支持機構４０は、ベース４１と、このベース４１に一端
が植設された平行な２枚の板ばね１７ａ、１７ｂと、板
ばね１７ａ、１７ｂの他端に固定されたヒンジを有する
部材１６とからなる。The support mechanism 40 includes a base 41, two parallel leaf springs 17a and 17b with one end implanted in the base 41, and a member 16 having a hinge fixed to the other end of the leaf springs 17a and 17b. Become.
ヒンジを有する部材１６の板ばね１７ａ、１７ｂとの固
定端と異なる端部には、圧入または接着等の固定手段に
より可動体１２が固定される。可動体１２の端部には対
物レンズ１３が装着される。ざらに、可動体１２には可
動体１２の慣性中心に対して互いに対称な位置にフォー
カシング用コイル１９ａ 、 １９ｂ及びドラッギング
用コイル２０ａ 、 ２０ｂが固定される。The movable body 12 is fixed to an end of the member 16 having a hinge, which is different from the end fixed to the leaf springs 17a and 17b, by a fixing means such as press fitting or adhesive. An objective lens 13 is attached to the end of the movable body 12. Roughly speaking, focusing coils 19a, 19b and dragging coils 20a, 20b are fixed to the movable body 12 at positions symmetrical to each other with respect to the center of inertia of the movable body 12.
なお、ヒンジ１４の回転中心軸は、平行板バネ１７ａ
、 １７ｂの両固定端の内側に配置され、対物レンズの
光軸方向と一致する回転中心軸を有するヒンジ１４の回
転中心軸は、対物レンズ１３を装着した可動体１２の慣
性中心と一致するように構成される。The center axis of rotation of the hinge 14 is the parallel plate spring 17a.
, 17b, and has a rotational center axis that coincides with the optical axis direction of the objective lens. It is composed of
基台１１に設けられた内側ヨーク２１ａ 、２１ｂと外
側ヨーク２２ａ 、２２ｂとは対向しており、外側ヨー
ク２２ａ 、 ２２ｂの内側ヨーク２１ａ 、 ２１ｂ
と対向する面には、マグネット２３ａ 、 ２３ｂが固
着されている。The inner yokes 21a, 21b and the outer yokes 22a, 22b provided on the base 11 face each other, and the inner yokes 21a, 21b of the outer yokes 22a, 22b
Magnets 23a and 23b are fixed to the surface facing the.
そして、可動体１２が基台１１に装着された状態では、
可動体１２に装着されたフォーカシング用コイル１９ａ
、 １９ｂの内側には、内側ヨーク２１ａ 、 ２１
ｂが所定の間隔が形成される状態で挿入される。またフ
ォーカシング用コイル１９ａ 、 １９ｂ ｌよびトラ
ッキング用コイル２０ａ 、 ２０ｂは、マグネット２
３ａ１２３ｂと対向する。When the movable body 12 is attached to the base 11,
Focusing coil 19a attached to movable body 12
, 19b have inner yokes 21a, 21
b are inserted with a predetermined interval formed. Further, the focusing coils 19a, 19bl and the tracking coils 20a, 20b are connected to the magnet 2.
Opposed to 3a123b.
なお、トラッキング用コイル２０ａ 、 ２０ｂ及びフ
ォーカシング用コイル１９ａ 、 １９ｂの外部回路と
の接続は、フレキシブル配線シート２４ａ１２４ｂにて
行なわれる。The tracking coils 20a, 20b and the focusing coils 19a, 19b are connected to external circuits using flexible wiring sheets 24a124b.
さて、上述の構成において、本実施例では基台１１、外
側ヨーク２２ａ 、 ２２ｂ 、内側ヨーク２１ａ。Now, in the above-mentioned configuration, in this embodiment, the base 11, the outer yokes 22a, 22b, and the inner yoke 21a.
２１ｂ及び角度調整機構２５は同一材質で、例えばプレ
ス成形により形成される。21b and the angle adjustment mechanism 25 are made of the same material and are formed by, for example, press molding.
上述の対物レンズ駆動装置では、対物レンズの情報記録
媒体の面内方向移動をヒンジにて駆動支点としてあり、
垂直方向の支持及び復元力を板ばねとしている。なお、
ヒンジを板ばねにて構成しても良い。また、慣性主軸回
りの回転に対する復元力を有するヒンジと平行板ばねを
射出成型にて一体成型してもよく、それにより組立工程
の低減および低廉化が可能となる。In the objective lens driving device described above, the in-plane direction movement of the information recording medium of the objective lens is used as a drive fulcrum using a hinge.
A leaf spring provides vertical support and restoring force. In addition,
The hinge may be made of a leaf spring. Further, the hinge having a restoring force against rotation about the main axis of inertia and the parallel leaf spring may be integrally molded by injection molding, thereby making it possible to reduce the assembly process and reduce the cost.
さて、第５図において、参照番＄５０は対物レンズ駆動
装置のカバー、６０は対物レンズ駆動装置を固定するベ
ースを示す。このベース６０には、図示しないが例えば
光ピツクアップヘッドの半導体レーザ、ビームスプリッ
タ、光検出器などの光学部品が固定されている。半導体
レーザからのレーザ光ビームは、基台１１の開孔を通過
して対物レンズ１３に向う。対物レンズ駆動装置は、基
台１１の底面に形成されて突出したり４物レンズの光軸
を角度調整を行なう角度調整機構２５をベース６０に対
向さぜるにうにしてベース６０に固定される。この際、
レーザ光ビームの光軸と対物レンズ１３の光軸を一致さ
せるために、角度調整は構２５の中心を中心とした円周
方向の３か所に調整ねじ２６が配５ジされ、図示しない
光軸評価装置により、対物レンズ１３の光軸を観測しな
がら、調整ねじ２６（ζより対物レンズ１３の光軸の傾
きが調整される。Now, in FIG. 5, reference number $50 indicates a cover for the objective lens driving device, and reference numeral 60 indicates a base for fixing the objective lens driving device. Although not shown, optical components such as a semiconductor laser of an optical pickup head, a beam splitter, and a photodetector are fixed to the base 60. A laser beam from the semiconductor laser passes through an aperture in the base 11 and is directed toward the objective lens 13 . The objective lens driving device is fixed to the base 60 in such a way that an angle adjustment mechanism 25 that is formed on the bottom surface of the base 11 and protrudes and adjusts the angle of the optical axis of the four-objective lens is moved to face the base 60. . On this occasion,
In order to align the optical axis of the laser beam and the optical axis of the objective lens 13, adjustment screws 26 are provided at three locations in the circumferential direction around the center of the structure 25 to adjust the angle. While observing the optical axis of the objective lens 13 using the axis evaluation device, the inclination of the optical axis of the objective lens 13 is adjusted using the adjustment screw 26 (ζ).
なお、上述の実施例では、内側ヨークおよび外側ヨーク
を基台と一体にプレス成形したが、例えば内側ヨークは
、外側ヨークおよび基台とは個別部品を用い、第６図に
示すように基台に溶接して一体に固定１．）ても良い。In the above embodiment, the inner yoke and the outer yoke were integrally press-molded with the base, but for example, the inner yoke and the outer yoke and the base are separate parts, and the inner yoke is attached to the base as shown in FIG. Welded and fixed together 1. ) may be used.
［発明の効果］
本発明ににれば、磁気回路を構成するヨークと、対物レ
ンズの光軸の角度調整を行なう角度調整機構と、対物レ
ンズ駆動装置の基台とを共通の部材で形成するとともに
、これらを一体に形成したので、対物レンズ駆動装置の
組立ても容易となり、また価格も低廉となる。またコン
パクトに対物レンズ駆動装置が形成できる。更には、内
側ヨーク、外側ヨークの位置出しが正確に行なえるため
、磁気ギャップの磁束密度のばらつきが少なくなり、駆
動特性の良好な対物レンズ駆動装置が得られる。[Effects of the Invention] According to the present invention, the yoke constituting the magnetic circuit, the angle adjustment mechanism for adjusting the angle of the optical axis of the objective lens, and the base of the objective lens drive device are formed of a common member. In addition, since these are integrally formed, assembly of the objective lens driving device becomes easy and the cost becomes low. Furthermore, the objective lens driving device can be formed compactly. Furthermore, since the inner yoke and outer yoke can be accurately positioned, variations in the magnetic flux density of the magnetic gap are reduced, and an objective lens drive device with good drive characteristics can be obtained.
第１図は本発明の一実施例の対物レンズ駆動装置に用い
られるヨークおよび基台を示す斜視図、第２図は対物レ
ンズ駆動装置の全体を示す斜視図、第３図は分解斜視図
、第４図は平面図、第５図は第４図においてＡ−Ａ線に
沿っての断面図、第６図は他の実施例のヨークおよび基
台を示す斜視図である。
１１・・・磁性材
１１ａ 、 Ｉｌｂ −・・ビン
１２・・・可動体
１３・・・対物レンズ
１６・・・ヒンジを有する部材
１７ａ 、 １７ｂ ・・・板ばね
１９ａ 、 １９ｂ・・・フォーカシング用コイル２０
ａ 、 ２０ｂ・・・トラッキング用コイル２１ａ 、
２１ｂ・・・内側ヨーク
２２ａ 、 ２２ｂ・・・外側ヨーク
２３ａ 、２３ｂ・・・マグネット
２５・・・角度調整機構
２６・・・調整ねじ
４０・・・支持機構
４１・・・ベース
６０・・・対物レンズ駆動装置を固定するベース代理人
弁理士 則 近 惠 佑
同 大胡典夫
Ｚｌｌ）
第 １ 図
第 ２ 図
第 ３ 図
第 ４ 図FIG. 1 is a perspective view showing a yoke and a base used in an objective lens drive device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the entire objective lens drive device, and FIG. 3 is an exploded perspective view. FIG. 4 is a plan view, FIG. 5 is a sectional view taken along line A--A in FIG. 4, and FIG. 6 is a perspective view showing a yoke and a base of another embodiment. DESCRIPTION OF SYMBOLS 11...Magnetic material 11a, Ilb...Bin 12...Movable body 13...Objective lens 16...Members with hinges 17a, 17b...Leaf springs 19a, 19b...Focusing coil 20
a, 20b... tracking coil 21a,
21b...Inner yoke 22a, 22b...Outer yoke 23a, 23b...Magnet 25...Angle adjustment mechanism 26...Adjustment screw 40...Support mechanism 41...Base 60...Objective Base agent for fixing the lens drive device Patent attorney Nori Kei Chika Norio Ogo Zll) Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
体の前記複数のコイルに電気信号を供給して、前記対物
レンズを光学記録媒体の面内方向及び垂直方向の２方向
に駆動させる対物レンズ駆動装置において、 磁気回路を構成するヨークと、前記対物レンズの光軸の
傾き角度調整を行なう角度調整機構と、対物レンズ駆動
装置の基台とを共通の部材で形成するとともに、これら
を一体に形成したことを特徴とする対物レンズ駆動装置
。[Claims] An electric signal is supplied to the plurality of coils of a movable body including a plurality of coils and an optical system including an objective lens, so that the objective lens is moved in the in-plane direction and the vertical direction of the optical recording medium. In an objective lens drive device for driving in two directions, a yoke constituting a magnetic circuit, an angle adjustment mechanism for adjusting the inclination angle of an optical axis of the objective lens, and a base of the objective lens drive device are formed from a common member. and an objective lens driving device characterized in that these are integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62008242A JP2624663B2 (en) | 1987-01-19 | 1987-01-19 | Objective lens drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62008242A JP2624663B2 (en) | 1987-01-19 | 1987-01-19 | Objective lens drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63177323A true JPS63177323A (en) | 1988-07-21 |
| JP2624663B2 JP2624663B2 (en) | 1997-06-25 |
Family
ID=11687676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62008242A Expired - Lifetime JP2624663B2 (en) | 1987-01-19 | 1987-01-19 | Objective lens drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2624663B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02189729A (en) * | 1989-01-19 | 1990-07-25 | Canon Electron Inc | Optical system driver |
| JPH03113732A (en) * | 1989-09-22 | 1991-05-15 | Olympus Optical Co Ltd | Optical system drive device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5884630U (en) * | 1981-12-02 | 1983-06-08 | パイオニア株式会社 | Tracking actuator for optical information reading device |
| JPS61187025U (en) * | 1985-05-13 | 1986-11-21 |
-
1987
- 1987-01-19 JP JP62008242A patent/JP2624663B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5884630U (en) * | 1981-12-02 | 1983-06-08 | パイオニア株式会社 | Tracking actuator for optical information reading device |
| JPS61187025U (en) * | 1985-05-13 | 1986-11-21 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02189729A (en) * | 1989-01-19 | 1990-07-25 | Canon Electron Inc | Optical system driver |
| JPH03113732A (en) * | 1989-09-22 | 1991-05-15 | Olympus Optical Co Ltd | Optical system drive device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2624663B2 (en) | 1997-06-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |