JPH06215383A - Tilt adjusting device for objective lens - Google Patents

Tilt adjusting device for objective lens

Info

Publication number
JPH06215383A
JPH06215383A JP593393A JP593393A JPH06215383A JP H06215383 A JPH06215383 A JP H06215383A JP 593393 A JP593393 A JP 593393A JP 593393 A JP593393 A JP 593393A JP H06215383 A JPH06215383 A JP H06215383A
Authority
JP
Japan
Prior art keywords
objective lens
adjustment
tilt
pin
link
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.)
Withdrawn
Application number
JP593393A
Other languages
Japanese (ja)
Inventor
Ichiro Ikari
一郎 碇
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.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP593393A priority Critical patent/JPH06215383A/en
Publication of JPH06215383A publication Critical patent/JPH06215383A/en
Withdrawn legal-status Critical Current

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  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To perform highly accurate adjustment of an optical axis by fixing a link near to a disk and rocking a link far from the disk. CONSTITUTION:An adjustment pin 15 is provided vertically on an X-Y stage 16 and the stage 16 is movable in the directions of X and Y axes perpendicular to each other. An optical unit 5 is mounted on an adjustment tool 17 on which a throughhole 17r is formed and the adjustment pin 15 is inserted into the holes 17r, 5r from the lower side of the bottom part 5a of the optical unit 5 and into a hole 3r provided on a mounting plate 3. When an operator for adjustment moves the inserted adjustment pin 15 in the directions of X axis and Y axis by means of the X-Y stage 16, the mounting plate 3 rocks in the same directions as X-Y through the pin 15. While confirming a light spot by means of a monitor (not shown) based on the operation, the tilt of an objective lens 1 is adjusted. After the completion of the tilt adjustment, an adhesive is filled into the space between the mounting plate 3 and the bottom surface 5a from holes 5s on the four places provided on the bottom part 5a so as not to be in contact with the pin 15 and the pin 15 is pulled out after the adhesive is hardened.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明はディスク状情報記録媒体
に光スポットを照射し、光学的に情報を記録および/又
は再生する光学式情報記録再生装置における対物レンズ
傾き調整装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens tilt adjusting device in an optical information recording / reproducing device for irradiating a light spot on a disc-shaped information recording medium to optically record and / or reproduce information.

【0002】[0002]

【従来技術】光学式情報記録再生装置がディスク状情報
記録媒体(以下、単にディスクと称す)に対し、情報を
正確に記録あるいは再生を行うためには光スポットをで
きる限り小さく絞り込んで照射する必要があり、そのた
めには対物レンズの光軸と光ピックアップの光軸を平行
にし,かつ対物レンズの光軸をディスク面に対し垂直に
して光スポットを照射しなければならない。よって情報
を正確に記録/再生するにはディスクの傾きに対し、対
物レンズの傾きを調整し対物レンズの光軸を調整する機
構が必要になってくる。このような対物レンズの光軸の
傾きを調整する装置は従来種々の提案がされている。以
下、従来例の説明をする。
2. Description of the Related Art In order for an optical information recording / reproducing apparatus to accurately record or reproduce information on a disc-shaped information recording medium (hereinafter simply referred to as a disc), it is necessary to irradiate a light spot with a light spot narrowed down as small as possible. For that purpose, the optical axis of the objective lens and the optical axis of the optical pickup must be parallel, and the optical axis of the objective lens must be perpendicular to the disk surface to irradiate a light spot. Therefore, in order to accurately record / reproduce information, a mechanism for adjusting the tilt of the objective lens with respect to the tilt of the disc to adjust the optical axis of the objective lens is required. Various proposals have hitherto been made for a device for adjusting the inclination of the optical axis of such an objective lens. The conventional example will be described below.

【0003】図5、図6は特開昭59-223954 号公報に示
されるもので、対物レンズ1 の傾きを調整するために対
物レンズ1 の内部の主点Oを中心とする凸の球面21を対
物レンズ駆動装置20に形成し、その凸の球面21に対応す
る凹の球面31を前記対物レンズ駆動装置20を保持する光
学ブロック30に備えた装置である。この装置は対物レン
ズ駆動装置20が球面21の中心である対物レンズ1 の主点
Oを中心として回動自在となるようにしたもので、対物
レンズ1 の傾きの調整方法は光学ブロック30の底面に設
けた穴32a,32b,33a,33b と対物レンズ駆動装置20に設け
たネジ穴22a,22b,22c,22d にコイルバネ40a,40b,50a,50
b を介して調整ネジ60a,60b,60c,60d が螺合しており、
この調整ネジ60a,60b,60c,60d のねじ込み量によって対
物レンズ1 を傾き調整しようとするものである。
FIGS. 5 and 6 are shown in Japanese Patent Laid-Open No. 59-223954, and in order to adjust the tilt of the objective lens 1, a convex spherical surface 21 centered on the principal point O inside the objective lens 1 is used. Is formed in the objective lens driving device 20, and the concave spherical surface 31 corresponding to the convex spherical surface 21 is provided in the optical block 30 holding the objective lens driving device 20. In this device, the objective lens driving device 20 is made rotatable about the principal point O of the objective lens 1 which is the center of the spherical surface 21, and the inclination of the objective lens 1 is adjusted by the bottom surface of the optical block 30. Coil springs 40a, 40b, 50a, 50 in the holes 32a, 32b, 33a, 33b provided in the screw holes 22a, 22b, 22c, 22d provided in the objective lens driving device 20.
Adjustment screws 60a, 60b, 60c, 60d are screwed together via b,
The inclination of the objective lens 1 is adjusted by adjusting the screwing amounts of the adjusting screws 60a, 60b, 60c, 60d.

【0004】このような球面を用いた装置の他にも特開
昭59-189730 号公報に示される台形四連リンク機構を用
いた対物レンズ傾き調整装置がある。この装置の動作原
理を図7を用いて説明する。ベースとなる送りブロック
70の両端70a,70b には左右それぞれの支持リンク80a,80
b の尖端部81a,81b が回動中心として連結されている。
更にこの支持リンク80a,80b の他の尖端部82a,82b は光
学ブロック30の両端30a,30b に連結されている。光学ブ
ロック30には対物レンズ1とその対物レンズ1をフォー
カシングおよびトラッキングするための対物レンズ駆動
装置2 が配置されている。光学ブロック30と送りブロッ
ク70とは平行に配置され、光学ブロック30は送りブロッ
ク70よりディスクM側に配置されている。対物レンズ1
の傾きの調整は支持リンク80a,80b の回動によって光学
ブロック30を揺動させ対物レンズ1 を傾け対物レンズ1
の光軸をディスクMに対し垂直に光スポットを照射しよ
うとするものである。
In addition to such a device using a spherical surface, there is an objective lens tilt adjusting device using a trapezoidal quadruple link mechanism disclosed in Japanese Patent Laid-Open No. 59-189730. The operating principle of this device will be described with reference to FIG. The base feed block
Left and right support links 80a, 80 are attached to both ends 70a, 70b of 70.
The tips 81a and 81b of b are connected as the center of rotation.
Further, the other tips 82a, 82b of the support links 80a, 80b are connected to both ends 30a, 30b of the optical block 30. In the optical block 30, an objective lens 1 and an objective lens driving device 2 for focusing and tracking the objective lens 1 are arranged. The optical block 30 and the feed block 70 are arranged in parallel, and the optical block 30 is arranged closer to the disc M than the feed block 70. Objective lens 1
To adjust the tilt of the objective lens 1, tilt the objective lens 1 by swinging the optical block 30 by rotating the support links 80a and 80b.
Is intended to irradiate a light spot with its optical axis perpendicular to the disk M.

【0005】[0005]

【発明が解決しようとする課題】しかしながら上述した
それぞれの従来の装置には以下のような欠点がある。ま
ず球面を用いた図5、図6の装置においては凸の球面を
凹の球面上で滑らせるため接触面積が大きく摩擦抵抗が
非常に大となってしまう。このため球面の滑りが滑らか
ではなくネジの回転量と対物レンズの傾き量が一致しな
いので微調整が難しくなる。更に光学ブロック下面側か
ら対物レンズ駆動装置へのネジの螺合は組立作業を困難
にする。さらに部材に球面を形成することは工作上難し
くなり製作コストが大となる欠点がある。
However, each of the conventional devices described above has the following drawbacks. First, in the apparatus of FIGS. 5 and 6 using the spherical surface, the convex spherical surface slides on the concave spherical surface, resulting in a large contact area and a very large frictional resistance. Therefore, the slip of the spherical surface is not smooth and the amount of rotation of the screw does not match the amount of inclination of the objective lens, which makes fine adjustment difficult. Further, screwing a screw from the lower surface side of the optical block to the objective lens driving device makes assembly work difficult. Further, it is difficult to form a spherical surface on the member, which is disadvantageous in that the manufacturing cost becomes high.

【0006】一方、台形四連リンク機構を用い一対の平
行リンクのうちディスク側のリンクを揺動させ、対物レ
ンズを傾けようとする図7の装置は対物レンズを傾けた
際に対物レンズの位置がずれてしまうという不具合が生
じる。対物レンズの位置がずれると光スポットの調整、
即ちフォーカシングサーボ及びトラッキングサーボに無
理な負担がかかりサーボ特性が劣化してしまう。最悪の
場合にはそれらのサーボがかからなくなってしまう可能
性がある。この点について図8の模式図を用いて説明す
る。図8において点Oは対物レンズの主点、Aは対物レ
ンズの搭載された揺動リンク、C、Dは揺動リンクAを
支持する支持リンク、Bはこの四連リンク機構のベース
となる固定リンクを示す。θは対物レンズの傾き角度で
ある。OLは対物レンズの光軸を示す。この装置でディ
スクの傾きに応じ対物レンズを傾けようとするには支持
リンクC、Dの回動によって揺動リンクAを揺動させ
る。
On the other hand, in the apparatus of FIG. 7 in which the trapezoidal quadruple link mechanism is used to tilt the objective lens by swinging the link on the disk side of the pair of parallel links, the position of the objective lens is tilted when the objective lens is tilted. There is a problem that the position shifts. If the position of the objective lens shifts, adjust the light spot,
That is, the focusing servo and the tracking servo are unduly burdened and the servo characteristics are deteriorated. In the worst case, those servos may be lost. This point will be described with reference to the schematic diagram of FIG. In FIG. 8, a point O is a principal point of the objective lens, A is a swing link on which the objective lens is mounted, C and D are support links for supporting the swing link A, and B is a fixed base serving as a base of the four-link mechanism. Indicates a link. θ is the tilt angle of the objective lens. OL indicates the optical axis of the objective lens. In order to tilt the objective lens in accordance with the tilt of the disk in this device, the swing link A is swung by turning the support links C and D.

【0007】ここで重要な点は対物レンズの傾き調整を
行っても対物レンズの主点Oの位置が変化しないことが
理想という点である。対物レンズの主点Oの位置が変化
しないようにするには主点Oを回動中心とし、揺動リン
クAの両端の連結点a、bがOa、Obを半径とする回
動軌跡P、P´を描けば良い。しかし、実際の回動中心
は主点Oではなく連結点a、bから見て主点Oの反対側
に存在する連結点c、dである。実際の回動中心c、d
が連結点a、bを挟み理想の回動中心である主点Oの反
対側に位置しているため図8で示すとおり対物レンズの
傾き調整量が増加すればするほど連結点a、bの実際の
回動軌跡Q、Q´と理想の回動軌跡P、P´との差が拡
がってしまう。よって傾き調整が完了した後の対物レン
ズの主点の位置はOからO´に大きく変位してしまう。
An important point here is that it is ideal that the position of the principal point O of the objective lens does not change even if the tilt of the objective lens is adjusted. In order to prevent the position of the principal point O of the objective lens from changing, the principal point O is set as the center of rotation, and the connecting points a and b at both ends of the swing link A are turning trajectories P having radiuses Oa and Ob, respectively. Draw P '. However, the actual center of rotation is not the principal point O but the coupling points c and d existing on the opposite side of the principal point O when viewed from the coupling points a and b. Actual center of rotation c, d
Is located on the opposite side of the principal point O, which is the ideal center of rotation, with the connection points a and b sandwiched therebetween, and as the tilt adjustment amount of the objective lens increases as shown in FIG. The difference between the actual turning loci Q and Q'and the ideal turning loci P and P'is widened. Therefore, the position of the principal point of the objective lens after the tilt adjustment is completed is largely displaced from O to O ′.

【0008】また、この装置はリンク機構の上側リンク
に対物レンズ駆動装置を搭載しているのでアクセス可動
部全体のレンズ光軸方向の寸法が大きくなってしまい、
装置全体の薄型化が難しくなってしまうという欠点があ
る。本発明は上記欠点を解決し、光学的・サーボ的特性
の劣化を防ぎ、調整性が良好で、装置の製作上低コスト
であり、組立性が良好で装置の薄型化が可能な対物レン
ズ傾き調整装置を提供することを目的とする。
Further, since the objective lens driving device is mounted on the upper link of the link mechanism in this device, the size of the entire access movable portion in the lens optical axis direction becomes large,
There is a drawback that it becomes difficult to reduce the thickness of the entire device. The present invention solves the above-mentioned drawbacks, prevents deterioration of optical / servo characteristics, has good adjustability, is low in the cost of manufacturing the device, has good assemblability, and can be thinned in the objective lens. It is an object to provide an adjusting device.

【0009】[0009]

【問題点を解決する手段及び作用】本発明は上記目的を
達成するために一対の略平行リンクを有するリンク機構
を設けた対物レンズ傾き調整装置において、前記一対の
略平行リンクのうち記録媒体に近いリンクとしての固定
部材と、対物レンズ及び対物レンズ駆動装置を搭載した
記録媒体から遠いリンクとしての対物レンズ駆動装置保
持部材と、該対物レンズ駆動装置保持部材と前記固定部
材とを連結する複数の支持リンクと該複数の支持リンク
の延長線上に前記対物レンズの主点が通るようにし、対
物レンズ駆動装置保持部材が複数の支持リンクを介し揺
動することにより対物レンズを傾き調整した際の対物レ
ンズのずれを極めて小さくした。
In order to achieve the above object, the present invention provides an objective lens tilt adjusting device provided with a link mechanism having a pair of substantially parallel links, wherein the recording medium is one of the pair of substantially parallel links. A fixing member as a near link, an objective lens driving device holding member as a link far from the recording medium on which the objective lens and the objective lens driving device are mounted, and a plurality of connecting the objective lens driving device holding member and the fixing member. The objective at the time of adjusting the tilt of the objective lens by allowing the principal point of the objective lens to pass through the support link and the extension line of the plurality of support links and swinging the objective lens driving device holding member through the plurality of support links. The displacement of the lens is extremely small.

【0010】[0010]

【実施例】はじめに本発明の装置の動作原理を図4の模
式図を用いて説明する。尚、図4において図8と同一構
成箇所には同一符号を付してある。本発明の構成が図8
の従来例と異なる点は平行リンクのうちディスクから近
いリンクをベースに固定した固定リンクB´とし、ディ
スクから遠いリンクを揺動リンクA´とし、この揺動リ
ンクA´に対物レンズと対物レンズ駆動装置を搭載した
点である。対物レンズの傾きを調整しようとする場合、
連結点c,dをそれぞれ回動中心とする左右の支持リン
クC,Dが回動し、揺動リンクA´の両端の連結点a,
bは回動軌跡R、R´を描く。この場合、連結点a、b
から見て回動中心は主点Oと同方向の連結点c,dであ
るため実際の連結点a,bの回転軌跡R、R´と理想の
回転軌跡P、P´とでは互いの軌跡間隔が図8の従来技
術に比較し著しく小さくなる。このため対物レンズの傾
きを調整した際に生じる対物レンズの位置ずれが極めて
小さくなる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the operation principle of the device of the present invention will be described with reference to the schematic diagram of FIG. In FIG. 4, the same components as those in FIG. 8 are designated by the same reference numerals. The configuration of the present invention is shown in FIG.
The difference from the conventional example is a fixed link B'fixed to the base of a parallel link near the disc, and a link far from the disc is a swing link A ', and an objective lens and an objective lens are attached to this swing link A'. The point is that the drive device is installed. When trying to adjust the tilt of the objective lens,
The left and right support links C and D are rotated about the connecting points c and d, respectively, and the connecting points a and a at both ends of the swing link A ′ are rotated.
b draws rotation trajectories R and R '. In this case, the connection points a, b
As seen from the above, since the center of rotation is the connecting points c and d in the same direction as the principal point O, the rotational trajectories R and R'of the actual connecting points a and b and the ideal rotational trajectories P and P'are mutual trajectories. The spacing is significantly smaller than in the prior art of FIG. Therefore, the positional deviation of the objective lens that occurs when the tilt of the objective lens is adjusted becomes extremely small.

【0011】以下本発明の一実施例を図1、図2、図3
を用いて説明する。図1は本発明の対物レンズ傾き調整
装置の分解斜視図、図2は対物レンズの傾き調整中にお
ける装置の断面正面図、図3は対物レンズの傾き調整完
了時の装置の断面正面図である。図1において対物レン
ズ1 をその光軸及び光軸と直交する方向に駆動させる対
物レンズ駆動装置2 にはベース4 が固定されている。対
物レンズ駆動装置2 は揺動リンクとなる取付板3 上に設
けられた2個のボス部3a,3b と対物レンズ駆動装置2 の
ベース4 に設けた貫通した孔4a,4b (4bは図示せず)と
の嵌合により位置決めされ取付板3 に接着固定されてい
る。取付板3 には光路形成のための切欠部3cと調整用の
貫通孔3rが形成されている。調整用の孔3rは調整ピン15
(図2参照)の径より僅かに大きく形成されている。取
付板3 の外側4隅にはそれぞれ4本の支持リンクとして
機能する連結棒8a,8b,8c,8d の各一端が揺動可能に連結
されている。連結棒8a,8b,8c,8d の他端部の方は装置の
ベースとなる光学ユニット5の両側部に設けた支持台5c,
5d に固定される固定板部材7a,7b に揺動可能に連結さ
れる。これら取付板3 と2枚の固定板部材7a,7b 、それ
に連結棒8a,8b,8c,8dはプラスチック材等の合成樹脂で
一体的に成形され1個の部材となっており、連結棒8a,8
b,8c,8d はその延長線上の交点に対物レンズ1 の主点O
が一致するように配置される。このような配置により取
付板3 はX軸、Y軸の2方向に揺動可能になる。 光学
ユニット5 はこの装置のベースとなっている。この光学
ユニット5 は底部5aと内部に半導体レーザやフォトダイ
オード及びプリズム等の光学部材等を収納した光学ブロ
ック5bと両側部に設けた支持台5c,5d とで構成されてい
る。底部5aには取付板3 に形成された調整用の孔3rに対
向した位置に調整用の貫通孔5rが形成されている。ま
た、5sは接着剤充填用の貫通孔で底部5aに4か所形成さ
れている。調整用の孔5rの径は調整用の孔3rの径より大
きく形成されている。固定部材7a,7b はそれぞれ図1の
破線のように支持台5c,5d に固定されている。尚、前述
図4中の固定リンクB´は図1中の固定部材7a,7b に相
当し、揺動リンクA´は取付板3 に相当する。カバー9
は対物レンズ1 及び対物レンズ駆動装置2 の周辺を覆う
ように光学ユニット5 に固定される。半導体レーザから
出射されたレーザビームは種々の光学部材を通り光学ブ
ロック5 の対物レンズ駆動装置2側の壁部5b1 に設けら
れた開口部10から出射し、立ち上げミラー11でほぼ直角
方向に反射され対物レンズ1 に入射する。その後、レー
ザビームは対物レンズ1 により収束されディスク(図示
せず)上に光スポットを形成する。ディスクからの反射
光は元の光路を経て光学ブロック5 内に戻り、途中ビー
ムスプリッタ(図示せず)で受光素子であるフォトダイ
オード(図示せず)に導かれる。フォトダイオードは反
射光を受光し、その出力から情報信号、フォーカスエラ
ー信号、トラッキングエラー信号を得る。
An embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 3.
Will be explained. FIG. 1 is an exploded perspective view of an objective lens tilt adjusting device of the present invention, FIG. 2 is a sectional front view of the device during the objective lens tilt adjustment, and FIG. 3 is a sectional front view of the device when the objective lens tilt adjustment is completed. . In FIG. 1, a base 4 is fixed to an objective lens driving device 2 for driving the objective lens 1 in its optical axis and in a direction orthogonal to the optical axis. The objective lens driving device 2 has two boss portions 3a, 3b provided on a mounting plate 3 which serves as a swing link and through holes 4a, 4b (4b not shown) provided in a base 4 of the objective lens driving device 2. It is positioned by being fitted to the mounting plate 3 and is fixed by adhesion. A notch 3c for forming an optical path and a through hole 3r for adjustment are formed in the mounting plate 3. Adjusting hole 3r has adjusting pin 15
It is formed slightly larger than the diameter (see FIG. 2). One end of each of connecting rods 8a, 8b, 8c, 8d functioning as four supporting links is swingably connected to the outer four corners of the mounting plate 3. The other ends of the connecting rods 8a, 8b, 8c, 8d are the support bases 5c provided on both sides of the optical unit 5 which is the base of the device.
It is swingably connected to fixed plate members 7a and 7b fixed to 5d. The mounting plate 3, the two fixing plate members 7a and 7b, and the connecting rods 8a, 8b, 8c, and 8d are integrally molded with a synthetic resin such as a plastic material to form a single member. , 8
b, 8c, 8d are the principal points O of the objective lens 1 at the intersections on the extension lines.
Are arranged so that they match. With this arrangement, the mounting plate 3 can be swung in two directions of the X axis and the Y axis. The optical unit 5 is the base of this device. The optical unit 5 is composed of a bottom portion 5a, an optical block 5b in which optical members such as a semiconductor laser, a photodiode, and a prism are housed, and supports 5c and 5d provided on both sides. An adjusting through hole 5r is formed in the bottom portion 5a at a position facing the adjusting hole 3r formed in the mounting plate 3. Further, 5s is a through hole for filling the adhesive, and is formed at four places on the bottom portion 5a. The diameter of the adjusting hole 5r is larger than the diameter of the adjusting hole 3r. The fixing members 7a and 7b are fixed to the support bases 5c and 5d, respectively, as shown by the broken lines in FIG. The fixed link B'in FIG. 4 corresponds to the fixing members 7a and 7b in FIG. 1, and the swing link A'corresponds to the mounting plate 3. Cover 9
Is fixed to the optical unit 5 so as to cover the periphery of the objective lens 1 and the objective lens driving device 2. The laser beam emitted from the semiconductor laser passes through various optical members and is emitted from the opening 10 provided in the wall 5b 1 on the objective lens driving device 2 side of the optical block 5 and is almost perpendicular to the rising mirror 11. It is reflected and enters the objective lens 1. Then, the laser beam is converged by the objective lens 1 to form a light spot on a disc (not shown). The reflected light from the disk returns to the optical block 5 via the original optical path and is guided to a photodiode (not shown) which is a light receiving element by a beam splitter (not shown) on the way. The photodiode receives the reflected light and obtains an information signal, a focus error signal, and a tracking error signal from its output.

【0012】次に対物レンズの傾き調整方法を図2を用
いて説明する。調整ピン15はX−Yステージ16上に垂直
に立設されている。X−Yステージ16は互いに直角なX
軸方向とY軸方向に移動できるようになっている。光学
ユニット5 は貫通孔17r が形成された調整治具17上に載
置される。調整ピン15は光学ユニット5 の底部5aの下側
より孔17r と孔5rに挿入すると共に、取付板3 に設けた
孔3rに挿入する。調整作業者は挿入した調整ピン15を図
中X軸、Y軸方向にX−Yステージ16により移動させる
と取付板3 は調整ピン15を介してX−Yステージと同じ
方向に揺動する。かかる操作に基づき光スポットを図示
しないモニターによって確認しながら対物レンズ1の傾
きを調整する。傾き調整が完了した後は図3に示すよう
に底部5aに設けた4箇所の孔5sから調整ピン15に接触し
ないように取付板3 と底面5aとの間に接着剤13を充填
し、硬化してから調整ピン15を抜く。
Next, a method of adjusting the inclination of the objective lens will be described with reference to FIG. The adjustment pin 15 is erected vertically on the XY stage 16. The XY stage 16 has Xs at right angles to each other.
It can be moved in the axial direction and the Y-axis direction. The optical unit 5 is placed on the adjusting jig 17 in which the through hole 17r is formed. The adjusting pin 15 is inserted into the hole 17r and the hole 5r from the lower side of the bottom portion 5a of the optical unit 5 and also into the hole 3r provided in the mounting plate 3. When the adjusting operator moves the inserted adjusting pin 15 in the X-axis and Y-axis directions in the figure by the XY stage 16, the mounting plate 3 swings in the same direction as the XY stage via the adjusting pin 15. Based on this operation, the tilt of the objective lens 1 is adjusted while checking the light spot on a monitor (not shown). After the tilt adjustment is completed, as shown in FIG. 3, the adhesive 13 is filled between the mounting plate 3 and the bottom surface 5a so as not to come into contact with the adjustment pin 15 from the four holes 5s provided on the bottom portion 5a, and then cured. After that, pull out the adjustment pin 15.

【0013】以上説明したように本実施例の構成によれ
ば調整時において部材等の摩擦が無いためスムーズに調
整が行える。また対物レンズの傾き調整を行っても対物
レンズの位置の変化が小さいのでディスク上での最良の
小さな光スポットを形成することができ、対物レンズ駆
動装置のサーボ的特性が劣化することが無い。また部品
点数が少なく、一方向からの組立が可能なため低コスト
で組立性も良好となると共にリンク機構の内部に対物レ
ンズ駆動装置が搭載されているため装置の薄型化が可能
である。
As described above, according to the structure of this embodiment, since there is no friction of the members and the like during the adjustment, the adjustment can be performed smoothly. Further, even if the inclination of the objective lens is adjusted, the change in the position of the objective lens is small, so that the best small light spot on the disk can be formed and the servo characteristics of the objective lens driving device are not deteriorated. Further, since the number of parts is small and the assembly is possible from one direction, the cost is low and the assemblability is good, and the device can be thinned because the objective lens driving device is mounted inside the link mechanism.

【0014】[0014]

【発明の効果】本発明はディスクに近いリンクを固定
し、遠い方のリンクを揺動するようにしたため対物レン
ズの傾き調整の際、対物レンズは光軸方向に変化せず、
したがって高精度な光軸調整が可能であると共に装置が
安価にできる利点がある。
According to the present invention, the link close to the disk is fixed and the link far from the disk is oscillated. Therefore, when the tilt of the objective lens is adjusted, the objective lens does not change in the optical axis direction.
Therefore, there is an advantage that the optical axis can be adjusted with high accuracy and the apparatus can be inexpensive.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例の分解斜視図である。FIG. 1 is an exploded perspective view of an embodiment of the present invention.

【図2】本発明の実施例の対物レンズの傾き調整中の断
面正面図である。
FIG. 2 is a sectional front view of the objective lens according to the embodiment of the present invention during tilt adjustment.

【図3】本発明の実施例の対物レンズの傾き調整完了時
の断面正面図である。
FIG. 3 is a cross-sectional front view of the objective lens according to the embodiment of the present invention when the tilt adjustment is completed.

【図4】本発明の実施例の模式図である。FIG. 4 is a schematic view of an example of the present invention.

【図5】従来例1の分解斜視図である。5 is an exploded perspective view of Conventional Example 1. FIG.

【図6】従来例1の断面図である。FIG. 6 is a sectional view of Conventional Example 1.

【図7】従来例2の正面図である。FIG. 7 is a front view of Conventional Example 2.

【図8】従来例2の模式図である。FIG. 8 is a schematic view of Conventional Example 2.

【符号の説明】[Explanation of symbols]

1 対物レンズ 2 対物レンズ駆動装置 3 取付板 3r 調整用の孔 5 光学ユニット 5c、5d 支持台 5r 調整用の孔 5s 接着剤充填用孔 7a、7b 固定部材 8a、8b、8c、8d 連結棒 13 接着剤 15 調整ピン 16 X−Yステージ 17 調整治具 17r 調整用の孔 O 対物レンズの主点 1 Objective Lens 2 Objective Lens Driving Device 3 Mounting Plate 3r Adjustment Hole 5 Optical Unit 5c, 5d Support 5r Adjustment Hole 5s Adhesive Filling Hole 7a, 7b Fixing Member 8a, 8b, 8c, 8d Connecting Rod 13 Adhesive 15 Adjustment pin 16 XY stage 17 Adjustment jig 17r Adjustment hole O Main point of objective lens

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成5年5月27日[Submission date] May 27, 1993

【手続補正1】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0004[Correction target item name] 0004

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【0004】このような球面を用いた装置の他にも
昭59-189730 号公報に示される台形四連リンク機構を用
いた対物レンズ傾き調整装置がある。この装置の動作原
理を図7を用いて説明する。ベースとなる送りブロック
70の両端70a,70b には左右それぞれの支持リンク80a,80
b の尖端部81a,81b が回動中心として連結されている。
更にこの支持リンク80a,80b の他の尖端部82a,82b は光
学ブロック30の両端30a,30b に連結されている。光学ブ
ロック30には対物レンズ1 とその対物レンズ1 をフォー
カシングおよびトラッキングするための対物レンズ駆動
装置2 が配置されている。光学ブロック30と送りブロッ
ク70とは平行に配置され、光学ブロック30は送りブロッ
ク70よりディスクM側に配置されている。対物レンズ1
の傾きの調整は支持リンク80a,80b の回動によって光学
ブロック30を揺動させ対物レンズ1 を傾け対物レンズ1
の光軸をディスクMに対し垂直に光スポットを照射しよ
うとするものである。
[0004] There are objective lens inclination adjusting device using the trapezoidal quadruplicate link mechanism shown in addition to JP-real HirakiAkira 59-189730 devices using such spherical. The operating principle of this device will be described with reference to FIG. The base feed block
Left and right support links 80a, 80 are attached to both ends 70a, 70b of 70.
The tips 81a and 81b of b are connected as the center of rotation.
Further, the other tips 82a, 82b of the support links 80a, 80b are connected to both ends 30a, 30b of the optical block 30. The objective lens 1 and the objective lens driving device 2 for focusing and tracking the objective lens 1 are arranged in the optical block 30. The optical block 30 and the feed block 70 are arranged in parallel, and the optical block 30 is arranged closer to the disc M than the feed block 70. Objective lens 1
To adjust the tilt of the objective lens 1, tilt the objective lens 1 by swinging the optical block 30 by rotating the support links 80a and 80b.
Is intended to irradiate a light spot with its optical axis perpendicular to the disk M.

【手続補正2】[Procedure Amendment 2]

【補正対象書類名】図面[Document name to be corrected] Drawing

【補正対象項目名】図7[Name of item to be corrected] Figure 7

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【図7】 [Figure 7]

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 一対の略平行リンクを有するリンク機構
を設けた対物レンズ傾き調整装置において、前記一対の
略平行リンクのうち記録媒体に近いリンクとしての固定
部材と、対物レンズ及び対物レンズ駆動装置を搭載した
記録媒体から遠いリンクとしての対物レンズ駆動装置保
持部材と、該対物レンズ駆動装置保持部材と前記固定部
材とを連結する複数の支持リンクと該複数の支持リンク
の延長線上に前記対物レンズの主点が通るようにしたこ
とを特徴とする対物レンズ傾き調整装置。
1. An objective lens tilt adjusting device provided with a link mechanism having a pair of substantially parallel links, wherein a fixing member as a link near the recording medium among the pair of substantially parallel links, an objective lens and an objective lens driving device. , An objective lens driving device holding member as a link far from a recording medium, a plurality of support links connecting the objective lens driving device holding member and the fixing member, and the objective lens on an extension line of the plurality of supporting links. An objective lens tilt adjusting device, characterized in that the principal point of is passed.
JP593393A 1993-01-18 1993-01-18 Tilt adjusting device for objective lens Withdrawn JPH06215383A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP593393A JPH06215383A (en) 1993-01-18 1993-01-18 Tilt adjusting device for objective lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP593393A JPH06215383A (en) 1993-01-18 1993-01-18 Tilt adjusting device for objective lens

Publications (1)

Publication Number Publication Date
JPH06215383A true JPH06215383A (en) 1994-08-05

Family

ID=11624706

Family Applications (1)

Application Number Title Priority Date Filing Date
JP593393A Withdrawn JPH06215383A (en) 1993-01-18 1993-01-18 Tilt adjusting device for objective lens

Country Status (1)

Country Link
JP (1) JPH06215383A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5812329A (en) * 1996-05-24 1998-09-22 Alps Electric Co., Ltd. Pickup system
US11232402B2 (en) 2010-02-26 2022-01-25 3M Innovative Properties Company Clinical data reconciliation as part of a report generation solution

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5812329A (en) * 1996-05-24 1998-09-22 Alps Electric Co., Ltd. Pickup system
US11232402B2 (en) 2010-02-26 2022-01-25 3M Innovative Properties Company Clinical data reconciliation as part of a report generation solution

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