JPH05189785A - Objective lens actuator - Google Patents
Objective lens actuatorInfo
- Publication number
- JPH05189785A JPH05189785A JP4003243A JP324392A JPH05189785A JP H05189785 A JPH05189785 A JP H05189785A JP 4003243 A JP4003243 A JP 4003243A JP 324392 A JP324392 A JP 324392A JP H05189785 A JPH05189785 A JP H05189785A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- mounting surface
- actuator
- light
- lens
- 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
Landscapes
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、情報の記録，再生のた
めに光束を光記録媒体に集光する対物レンズを駆動する
対物レンズアクチュエータに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens actuator for driving an objective lens that collects a light beam on an optical recording medium for recording and reproducing information.
【０００２】[0002]
【従来の技術】対物レンズアクチュエータにおいて、対
物レンズを可動体であるボビンに予め設定された状態で
良好かつ強固に固定するために種々の方法が提案され、
実施されている。2. Description of the Related Art In an objective lens actuator, various methods have been proposed in order to satisfactorily and firmly fix an objective lens to a bobbin which is a movable body in a preset state.
It has been implemented.
【０００３】例えば実開昭62−195217号公報には、レン
ズの入射面側と出射面側とを間違えないようにホルダに
挿入して固定するためのレンズ取付装置が示されてい
る。For example, Japanese Utility Model Laid-Open No. 62-195217 discloses a lens mounting device for inserting and fixing the lens into the holder so that the incident surface side and the emitting surface side of the lens are not mistaken.
【０００４】[0004]
【発明が解決しようとする課題】上記の従来のレンズ取
付装置では、レンズの挿入側の光透過面がホルダに接触
する構成であるので、組立時にレンズを誤って傾けてホ
ルダに挿入してしまうと、光透過面に傷を付けてしまう
おそれがある。In the above-described conventional lens mounting device, the light transmitting surface on the insertion side of the lens is in contact with the holder. Therefore, the lens is accidentally tilted and inserted into the holder during assembly. Then, the light transmitting surface may be scratched.
【０００５】また、通常、レンズをホルダに固定するた
め接着剤が用いられるが、組立時に接着剤の一部が固定
部以外へ流出し、時としてレンズの光透過面にまで流れ
てレンズ性能を劣化させるという問題がある。In addition, an adhesive is usually used to fix the lens to the holder, but at the time of assembly, a part of the adhesive flows out to a portion other than the fixing portion and sometimes flows to the light transmitting surface of the lens to improve the lens performance. There is a problem of deterioration.
【０００６】本発明の目的は、対物レンズを光学的性能
を劣化させることなく、容易かつ確実に固定できる対物
レンズアクチュエータを提供することにある。An object of the present invention is to provide an objective lens actuator which can easily and surely fix the objective lens without deteriorating the optical performance.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
め、本発明は、情報の記録，再生のために光束を光記録
媒体に集光する対物レンズと、対物レンズが搭載され、
かつ少なくとも記録媒体に対して接離する方向に移動自
在に支持された可動体と、可動体を駆動して対物レンズ
の焦点制御を行う駆動手段とを有する対物レンズアクチ
ュエータにおいて、前記可動体に、対物レンズが載置さ
れて可動体に対する対物レンズの光軸方向の位置決めを
する対物レンズ載置面と、対物レンズの外径の位置決め
をする対物レンズ嵌合部と、対物レンズ載置面から距離
をおいて対物レンズに入射する光束の径を決定する円筒
状のアパーチャを形成したことを特徴とする。In order to achieve the above-mentioned object, the present invention is equipped with an objective lens for condensing a light beam on an optical recording medium for recording and reproducing information, and an objective lens,
And an objective lens actuator having at least a movable body movably supported in a direction of approaching and separating from a recording medium, and a drive means for driving the movable body to perform focus control of the objective lens, wherein the movable body has: The objective lens mounting surface for positioning the objective lens in the optical axis direction with respect to the movable body, the objective lens fitting portion for positioning the outer diameter of the objective lens, and the distance from the objective lens mounting surface It is characterized in that a cylindrical aperture for determining the diameter of the light beam incident on the objective lens is formed.
【０００８】また前記アパーチャの対物レンズ側に傾斜
面を形成したことを特徴とする。Further, the invention is characterized in that an inclined surface is formed on the objective lens side of the aperture.
【０００９】また前記対物レンズ嵌合部の少なくとも２
箇所に対物レンズの光軸に対して対称に切欠部を設け、
この切欠部と対物レンズの側面で形成される凹部に接着
剤を設けて対物レンズを前記可動部に固定したことを特
徴とする。At least two of the objective lens fitting portions are also provided.
A notch is provided symmetrically with respect to the optical axis of the objective lens,
The objective lens is fixed to the movable portion by providing an adhesive in a recess formed between the cutout portion and the side surface of the objective lens.
【００１０】さらに前記対物レンズ載置面の外周に凹欠
部を設け、さらに前記対物レンズ嵌合部の切欠部を対物
レンズ載置面より低い位置まで形成したことを特徴とす
る。Further, a concave notch is provided on the outer periphery of the objective lens mounting surface, and the notch of the objective lens fitting portion is formed to a position lower than the objective lens mounting surface.
【００１１】[0011]
【作用】上記の手段によれば、可動体に、対物レンズが
載置されて可動体に対する対物レンズの光軸方向の位置
決めをする対物レンズ載置面と、対物レンズの外径の位
置決めをする対物レンズ嵌合部と、対物レンズ載置面か
ら一段下がった位置に対物レンズに入射する光束の径を
決める円筒状のアパーチャを形成したので、対物レンズ
の光束透過面が可動体に接触することがなく、組立時に
誤って対物レンズを傾けて載置してしまった場合でも対
物レンズを傷つけてしまうのを防ぐことができる。According to the above means, the objective lens is placed on the movable body and the objective lens mounting surface for positioning the objective lens in the optical axis direction with respect to the movable body and the outer diameter of the objective lens are positioned. Since the objective lens fitting part and the cylindrical aperture that determines the diameter of the light beam incident on the objective lens are formed at a position one step lower than the objective lens mounting surface, the light beam transmitting surface of the objective lens should contact the movable body. Therefore, even if the objective lens is accidentally tilted and mounted during assembly, the objective lens can be prevented from being damaged.
【００１２】またアパーチャの対物レンズ側に傾斜面を
設けたので、アパーチャの最小径部と対物レンズとの距
離が短くなり、アパーチャの最小径部のエッジで起こる
回折を最小限に抑えられる。Further, since the inclined surface is provided on the objective lens side of the aperture, the distance between the minimum diameter portion of the aperture and the objective lens is shortened, and diffraction occurring at the edge of the minimum diameter portion of the aperture can be minimized.
【００１３】また対物レンズ嵌合部に、２箇所以上の切
欠部を対物レンズの光軸に対して対称な位置に設け、切
欠部と対物レンズの側面で形成される凹部に接着剤を付
けて対物レンズを可動体に固定したので、接着剤が対物
レンズの上面や下面に流れ込んでしまうことなく、確実
に対物レンズを可動体に固定することができる。Further, two or more notches are provided in the objective lens fitting portion at positions symmetrical with respect to the optical axis of the objective lens, and an adhesive is attached to the notches and the concave portions formed by the side surfaces of the objective lens. Since the objective lens is fixed to the movable body, the objective lens can be reliably fixed to the movable body without the adhesive flowing into the upper surface or the lower surface of the objective lens.
【００１４】さらに対物レンズ載置面の外周に凹欠部を
設け、対物レンズ嵌合部の前記切欠部を対物レンズ載置
面より低い位置まで設けたので、対物レンズの全周を接
着することができ、接着強度がさらに増す。Further, since the concave portion is provided on the outer periphery of the objective lens mounting surface and the cutout portion of the objective lens fitting portion is provided to a position lower than the objective lens mounting surface, the entire circumference of the objective lens is bonded. The adhesive strength is further increased.
【００１５】[0015]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１６】図１は本発明の対物レンズアクチュエータ
ユニットの一実施例を示す分解斜視図、図２は対物レン
ズ取付部を一部断面した斜視図、図３は図２の対物レン
ズ取付時の状態の断面図、図４は図２の接着部分の斜視
図である。FIG. 1 is an exploded perspective view showing an embodiment of an objective lens actuator unit of the present invention, FIG. 2 is a perspective view in which an objective lens mounting portion is partially sectioned, and FIG. 3 is a state when the objective lens of FIG. 2 is mounted. FIG. 4 is a perspective view of the adhesive portion of FIG.
【００１７】同図において、対物レンズ１を搭載した可
動体であるボビン２には、フォーカシング用のコイル３
が巻回され、さらに両側にトラッキング用のコイル４が
接着固定されている。またボビン２は、フォーカシング
方向とトラッキング方向の両方向に変形可能な弾性支持
手段である板バネ５で上下左右４箇所支持されており、
駆動手段を構成するフォーカシング用，トラッキング用
のコイル３，４に流す電流を制御することによって磁気
回路による一定磁界との電磁作用でフォーカシング方
向，トラッキング方向に駆動制御される。In FIG. 1, a bobbin 2 which is a movable body carrying an objective lens 1 has a focusing coil 3 on a bobbin 2.
Is wound, and the coils 4 for tracking are bonded and fixed on both sides. Further, the bobbin 2 is supported at four positions in the vertical and horizontal directions by a leaf spring 5 which is an elastic supporting means that is deformable in both the focusing direction and the tracking direction.
By controlling the currents flowing through the focusing and tracking coils 3 and 4 that constitute the driving means, the driving is controlled in the focusing direction and the tracking direction by the electromagnetic action of the magnetic circuit with the constant magnetic field.
【００１８】前記ボビン２には、対物レンズ１が載置さ
れて光軸方向の位置決めをする対物レンズ載置面６と、
対物レンズ１の外径の位置決めをする対物レンズ嵌合部
７と、対物レンズ載置面６から距離をおいて、一段下が
った位置に対物レンズ１に入射する光束の径を決める円
筒状のアパーチャ８が形成されている。そのため対物レ
ンズ１の光束透過面がボビン２に接触することが無く、
組立時に誤って対物レンズ１を傾けて載置してしまった
時に対物レンズ１を傷つけてしまうのを防ぐことができ
る。前記アパーチャ８の円筒面には、対物レンズ側の径
が大きくなるように射出成形時の抜き勾配(傾斜面)９が
付けられており、対物レンズ１と反対側の最小径部がア
パーチャ径となっている。これによって、対物レンズ嵌
合部７とアパーチャ８が後述する一体の型で成形できる
ため、対物レンズ１とアパーチャ８の同軸度が高精度で
実現でき、収差の発生を抑えてより理想に近い光スポッ
トを図示しない光ディスク記録面上に形成することがで
きる。またアパーチャ８の対物レンズ側に抜き勾配であ
る面取り９を設けることによりアパーチャ８の最小径部
と対物レンズ１との距離を短くして、アパーチャ８の最
小径部のエッジで生じる回折を最小限に抑えられる。On the bobbin 2, an objective lens mounting surface 6 on which the objective lens 1 is mounted for positioning in the optical axis direction,
An objective lens fitting portion 7 for positioning the outer diameter of the objective lens 1 and a cylindrical aperture that determines the diameter of the light beam incident on the objective lens 1 at a position that is one step lower than the objective lens mounting surface 6. 8 is formed. Therefore, the light flux transmitting surface of the objective lens 1 does not contact the bobbin 2,
It is possible to prevent the objective lens 1 from being damaged when the objective lens 1 is tilted and placed by mistake during assembly. The cylindrical surface of the aperture 8 is provided with a draft (inclined surface) 9 at the time of injection molding so that the diameter on the objective lens side becomes large, and the minimum diameter portion on the side opposite to the objective lens 1 is the aperture diameter. Is becoming As a result, the objective lens fitting portion 7 and the aperture 8 can be molded by an integrated mold described later, so that the coaxiality of the objective lens 1 and the aperture 8 can be realized with high accuracy, and the occurrence of aberrations can be suppressed to obtain a light beam closer to the ideal one. The spot can be formed on the recording surface of the optical disc (not shown). Further, by providing a chamfer 9 having a draft on the side of the objective lens of the aperture 8, the distance between the minimum diameter portion of the aperture 8 and the objective lens 1 is shortened, and the diffraction generated at the edge of the minimum diameter portion of the aperture 8 is minimized. Can be suppressed to.
【００１９】前記対物レンズ嵌合部７には対物レンズ１
を挟むようにしてトラッキング方向の両側に切り欠き10
が設けられていて、この切り欠き10と対物レンズ１の側
面で形成される凹部Ｏに接着剤11を付けることにより、
接着剤11が対物レンズ１の上面や下面に流れ込んでしま
うことなく、確実に対物レンズ１をボビン２に固定する
ことができる。切り欠き10は、本実施例で例示した位置
から光軸まわりに90°回転した位置に２箇所設けてもよ
く、また３箇所以上でもよい。さらにボビン２の下部に
は、対物レンズ１とバランスをとるために対物レンズバ
ランサＢが設けられている。ボビン２の材質は、繊維強
化プラスチックや液晶ポリマ等の高強度材料からなり、
対物レンズ駆動時の不要な共振を防いでいる。The objective lens 1 is attached to the objective lens fitting portion 7.
Notches 10 on both sides in the tracking direction so that
Is provided, and by applying an adhesive agent 11 to the recess O formed by the notch 10 and the side surface of the objective lens 1,
The objective lens 1 can be reliably fixed to the bobbin 2 without the adhesive agent 11 flowing into the upper surface or the lower surface of the objective lens 1. The cutouts 10 may be provided at two positions at positions rotated by 90 ° around the optical axis from the positions illustrated in the present embodiment, or at three or more positions. Further, an objective lens balancer B is provided below the bobbin 2 to balance the objective lens 1. The bobbin 2 is made of high strength material such as fiber reinforced plastic or liquid crystal polymer,
This prevents unnecessary resonance when driving the objective lens.
【００２０】図５は図２のアパーチャ部分の成形方法の
説明図であり、12は成形型であって、前記対物レンズ載
置面６に対応する成形部分12aと、前記対物レンズ嵌合
部７に対応する成形部分12bと、前記アパーチャ８に対
応する成形部分12cと、前記抜き勾配９に対応する傾斜
部分12dとが一体になっている。FIG. 5 is an explanatory view of a method of molding the aperture portion of FIG. 2, and 12 is a molding die, which is a molding portion 12a corresponding to the objective lens mounting surface 6 and the objective lens fitting portion 7. , A molding portion 12c corresponding to the aperture 8 and an inclined portion 12d corresponding to the draft 9 are integrated.
【００２１】前記成形型12で成形することによって、ボ
ビン２の対物レンズ嵌合部７部分とアパーチャ８を別型
で成形するよりも精度の高い同軸度が得られる。尚、成
形後にアパーチャ８の下端部ａにバリが生じた場合には
面取り処理を施す。By molding with the molding die 12, more accurate coaxiality can be obtained than when molding the objective lens fitting portion 7 portion of the bobbin 2 and the aperture 8 with different dies. If burr is generated on the lower end portion a of the aperture 8 after molding, chamfering is performed.
【００２２】図６はボビンにおける対物レンズ取付部の
他の例を示す平面図、図７は図６のｘ−ｘ線断面図であ
り、この例では、図２〜図４に基づいて説明した対物レ
ンズ載置面６の最外周部に凹欠部６aを形成し、さらに
図２，図４に基づいて説明した対物レンズ嵌合部７の切
り欠き10を対物レンズ載置面６より低い位置まで形成し
ており、図８に示したように、接着剤11が前記凹欠部６
aに回り込んで対物レンズ１の下側部全周がボビン２に
接着されることになり、接着強度を増すことができ、前
記凹欠部６aを通して切り欠き10から固定に関与しない
余分な接着剤１１が逃げるので、対物レンズ１の内周側
に接着剤１１が流れ込んでしまうことはなくなる。FIG. 6 is a plan view showing another example of the objective lens mounting portion of the bobbin, and FIG. 7 is a sectional view taken along the line xx of FIG. 6. In this example, description was made based on FIGS. A concave notch 6a is formed on the outermost peripheral portion of the objective lens mounting surface 6, and the notch 10 of the objective lens fitting portion 7 described with reference to FIGS. 2 and 4 is located at a position lower than the objective lens mounting surface 6. As shown in FIG. 8, the adhesive 11 is formed on the concave portion 6 as shown in FIG.
The entire circumference of the lower side of the objective lens 1 is adhered to the bobbin 2 by going around to a, the adhesive strength can be increased, and the extra adhesive not involved in the fixing from the notch 10 through the recess 6a. Since the agent 11 escapes, the adhesive 11 does not flow into the inner peripheral side of the objective lens 1.
【００２３】図９は板バネ取付部の分解斜視図、図10
(a)，(b)は板バネの一方端の固定方法の説明図、図11
(a)，(b)は板バネの他方端の固定方法の説明図であり、
ボビン２を支持する弾性支持部材である板バネは、厚さ
数十ミクロンの２枚の板材からなり、変形部５aは幅が
厚さの数倍程度で、フォーカシング方向とトラッキング
方向の両方向に変形する。一対の変形部５aは、固定部
側接着部５bでつながっている。上２本，下２本の４本
の変形部５aは、平行に配置され、かつボビン２をフォ
ーカシング方向とトラッキング方向に平行移動可能に支
持しており、変形部５aの両端には前記固定側接着部５b
と可動部側接着部５cから突起５dが出ており、変形部５
aより幅の広いダンピング部材15が貼着されている。ダ
ンピング部材15は、ブチルゴム等の粘弾性材料からな
り、板バネ５による共振の振幅を抑える作用をする。FIG. 9 is an exploded perspective view of the leaf spring mounting portion, and FIG.
11 (a) and 11 (b) are explanatory views of a method of fixing one end of the leaf spring, FIG.
(a), (b) is explanatory drawing of the fixing method of the other end of the leaf spring,
The leaf spring, which is an elastic support member that supports the bobbin 2, is made up of two leaf materials having a thickness of several tens of microns, and the deformable portion 5a has a width of several times the thickness and is deformed in both the focusing direction and the tracking direction. To do. The pair of deformable portions 5a are connected by the fixed portion side adhesive portion 5b. The four deformation parts 5a, the upper two and the lower two, are arranged in parallel and support the bobbin 2 so that the bobbin 2 can move in parallel in the focusing direction and the tracking direction. Adhesive part 5b
And the protrusion 5d from the movable portion side adhesive portion 5c, the deformable portion 5
A damping member 15 wider than a is attached. The damping member 15 is made of a viscoelastic material such as butyl rubber and acts to suppress the amplitude of resonance caused by the leaf spring 5.
【００２４】前記ボビン２の板バネ支持部16には、板バ
ネ固定ピン17が入る孔が形成され、可動部側接着部５c
を板バネ固定ピン17で挟むようにして接着固定する。ボ
ビン２の一側に設置される板バネ固定部材18の接着面18
aと板バネ15の固定部側接着部５bは、板バネ固定バー19
に設けられた２本のピン19aに対応する位置に丸孔18bと
長孔18cを有し、板バネ固定バー19で位置決めをしなが
ら板バネ５の固定部側接着部５bを挟むようにして接着
固定する。接着固定後、固定部側接着部５bに突設され
た連結部５eを図９の２点鎖線部分で切断する。The leaf spring support portion 16 of the bobbin 2 is formed with a hole into which the leaf spring fixing pin 17 is inserted, and the movable portion side adhesive portion 5c is formed.
Are sandwiched between the leaf spring fixing pins 17 and fixed by adhesion. Adhesive surface 18 of leaf spring fixing member 18 installed on one side of bobbin 2
a and the fixing portion side adhesive portion 5b of the leaf spring 15 are formed by the leaf spring fixing bar 19
Has a round hole 18b and an elongated hole 18c at positions corresponding to the two pins 19a provided on the plate spring, and the plate spring fixing bar 19 is used for positioning so that the fixing portion side adhesive portion 5b of the plate spring 5 is sandwiched and fixed. To do. After the adhesive fixing, the connecting portion 5e protruding from the fixed portion-side adhesive portion 5b is cut at the two-dot chain line portion in FIG.
【００２５】上下２本の変形部５aをそれぞれ１枚の板
バネから作っているので、容易に精度良く組立ることが
できる。また前記板バネ固定ピン17と板バネ固定バー19
は、それぞれ上下共通部品であって、板バネ５も上下共
通となっており、さらに板バネ固定部材18と板バネ固定
バー19は非導電性材料、例えばプラスチックからなって
いる。Since the upper and lower two deforming portions 5a are each made of one leaf spring, they can be assembled easily and accurately. Further, the leaf spring fixing pin 17 and the leaf spring fixing bar 19
Are the upper and lower common parts, and the leaf spring 5 is also the upper and lower common. Further, the leaf spring fixing member 18 and the leaf spring fixing bar 19 are made of a non-conductive material such as plastic.
【００２６】また板バネ５の固定方法は、図10，図11の
ように、ボビン２の板バネ支持部16と板バネ固定部材18
の接着面16a，18aにピン20a，20bを形成しておき、板バ
ネ５の孔５f，５gにそのピン20a，20bを通して熱カシメ
または超音波溶着でピン20a，20bの頭部をつぶして固定
しても良い。Further, the method of fixing the leaf spring 5 is as shown in FIGS. 10 and 11: the leaf spring supporting portion 16 and the leaf spring fixing member 18 of the bobbin 2.
Pins 20a and 20b are formed on the adhesive surfaces 16a and 18a, and the heads of the pins 20a and 20b are crushed and fixed by heat crimping or ultrasonic welding through the pins 20a and 20b in the holes 5f and 5g of the leaf spring 5. You may.
【００２７】前記フォーカシング用，トラッキング用の
各コイル３，４の端子は板バネ５の可動部側接着部５c
にハンダ付けされ、板バネ５の固定部側接着部５bはア
クチュエータ用フレキシブルケーブル21のアクチュエー
タ側ランド部にハンダ付けされる。アクチュエータ用フ
レキシブルケーブル21は板バネ固定部材18を巻くように
両面テープ等で貼着され、その際、板バネ固定部材18に
は段差18dが設けられているので、アクチュエータ用フ
レキシブルケーブル21の位置決めができると同時に、ア
クチュエータ用フレキシブルケーブル21がキャリッジベ
ース22の壁面に接触するのを防ぐことができる。そして
キャリッジ側ランド部はキャリッジベース22に取り付け
られたアクチュエータ用フレキシブルケーブル21のラン
ド部に接続される。板バネ５の前記連結部５eを切断し
てあるので、フォーカシング用，トラッキング用の各コ
イル３，４に独立に給電が可能である。The terminals of the focusing and tracking coils 3 and 4 are bonded to the movable portion 5c of the leaf spring 5.
The fixing portion side adhesive portion 5b of the leaf spring 5 is soldered to the actuator side land portion of the actuator flexible cable 21. The actuator flexible cable 21 is attached with a double-sided tape or the like so as to wind the leaf spring fixing member 18, and at this time, since the leaf spring fixing member 18 is provided with the step 18d, the actuator flexible cable 21 can be positioned. At the same time, it is possible to prevent the actuator flexible cable 21 from coming into contact with the wall surface of the carriage base 22. The carriage-side land portion is connected to the land portion of the actuator flexible cable 21 attached to the carriage base 22. Since the connecting portion 5e of the leaf spring 5 is cut, it is possible to independently feed power to the focusing and tracking coils 3 and 4.
【００２８】また図９に示したように、ボビン５には後
述するレンズ位置センサ用の遮光板23と、この遮光板23
とバランスをとるための遮光板バランサ24が取り付けら
れている。遮光板23と遮光板バランサ24は、それぞれ上
下の板バネ支持部16には挟持されて接しており、板バネ
支持部16の補強となって対物レンズ駆動時の不要な共振
を防いでいる。As shown in FIG. 9, the bobbin 5 has a light blocking plate 23 for a lens position sensor, which will be described later, and the light blocking plate 23.
A light-shielding plate balancer 24 is provided for balancing. The light-shielding plate 23 and the light-shielding plate balancer 24 are sandwiched and in contact with the upper and lower leaf spring supporting portions 16, respectively, to reinforce the leaf spring supporting portions 16 and prevent unnecessary resonance when the objective lens is driven.
【００２９】図12はアクチュエータベースの一部を切断
して示した斜視図、図13はボビンとキャリッジベースと
の支持機構部分の断面図であり、固定体であるアクチュ
エータベース25は、内ヨーク26と外ヨーク27が一体に設
けられており、外ヨーク27には永久磁石28が接着され、
さらに前記板バネ固定部材18の下面には丸穴と長穴が穿
設されていて、板バネ固定部材18がアクチュエータベー
ス25に設けられた位置決めピン29との嵌合で位置決めさ
れて図１に示したネジＮ１で固定される。また上ヨーク
30が内ヨーク26と外ヨーク27の上端をつなぐように取付
けられ、上ヨーク30，内ヨーク26，外ヨーク27，アクチ
ュエータベース25，永久磁石28とで磁気回路が構成され
る。FIG. 12 is a perspective view in which a part of the actuator base is cut away, and FIG. 13 is a cross-sectional view of a supporting mechanism part for the bobbin and the carriage base. The actuator base 25, which is a fixed body, has an inner yoke 26. And an outer yoke 27 are integrally provided, and a permanent magnet 28 is bonded to the outer yoke 27,
Further, a round hole and an elongated hole are bored in the lower surface of the leaf spring fixing member 18, and the leaf spring fixing member 18 is positioned by fitting with a positioning pin 29 provided on the actuator base 25, as shown in FIG. It is fixed with the screw N1 shown. Also upper yoke
30 is attached so as to connect the upper ends of the inner yoke 26 and the outer yoke 27, and the upper yoke 30, the inner yoke 26, the outer yoke 27, the actuator base 25, and the permanent magnet 28 form a magnetic circuit.
【００３０】図12，図13において、アクチュエータベー
ス25の下面には、対物レンズ１の主点Ｘを中心とする球
面の一部からなる球面座31を設け、この球面座31がキャ
リッジベース22に設けられた環状座32に接するようにア
クチュエータベース25がキャリッジベース22上に載置さ
れる。図示しない固定光学系からキャリッジベース22に
搭載された三角プリズム33へ光束が入射してくる側の球
面座31は切り欠かれており、球面座31で入射光が遮られ
ることがない。12 and 13, the lower surface of the actuator base 25 is provided with a spherical seat 31 which is a part of a spherical surface centered on the principal point X of the objective lens 1, and the spherical seat 31 serves as the carriage base 22. The actuator base 25 is placed on the carriage base 22 so as to come into contact with the annular seat 32 provided. The spherical seat 31 on the side where a light beam enters the triangular prism 33 mounted on the carriage base 22 from a fixed optical system (not shown) is notched, and the spherical seat 31 does not block the incident light.
【００３１】またアクチュエータベース25は、キャリッ
ジベース22の裏から２本の調整ネジ35と付勢バネ36で付
勢された付勢ネジ37とでネジ孔25aで止められており、
２本の調整ネジ35で対物レンズ１の光軸とディスク面と
が垂直になるように傾き調整される。球面座31の中心が
対物レンズ１の前記主点Ｘと一致しているので、アクチ
ュエータベース25を傾けても光軸がずれることがない。
図１に示したように、２本の調整ネジ35と１本の付勢ネ
ジ37を通すためにキャリッジベース22に設けられた３個
の通孔22a〜22cのうち、２個は22a，22bはバカ孔であっ
て、１個22cは付勢ネジ37の外径と略等しい幅の長孔と
なっていて、対物レンズアクチュエータが光軸のまわり
に回転してしまうことがない。また傾き調整する時に
は、付勢ネジ37は前記環状座32の半径方向に動かなけれ
ばならないため、長孔22cの長さ方向を環状座32の半径
方向と一致させている。The actuator base 25 is fixed at the screw hole 25a from the back of the carriage base 22 by two adjusting screws 35 and a biasing screw 37 biased by a biasing spring 36.
The tilt is adjusted by the two adjusting screws 35 so that the optical axis of the objective lens 1 and the disk surface are vertical. Since the center of the spherical seat 31 coincides with the principal point X of the objective lens 1, the optical axis does not shift even if the actuator base 25 is tilted.
As shown in FIG. 1, of the three through holes 22a to 22c provided in the carriage base 22 for passing the two adjusting screws 35 and the one biasing screw 37, two of them are 22a and 22b. Is a stupid hole, and one 22c is a long hole having a width substantially equal to the outer diameter of the biasing screw 37, so that the objective lens actuator does not rotate around the optical axis. Further, when adjusting the inclination, the biasing screw 37 has to move in the radial direction of the annular seat 32, so the length direction of the elongated hole 22c is made to coincide with the radial direction of the annular seat 32.
【００３２】図14はレンズ位置センサＳの分解斜視図、
図15は図14のハウジングの底面を示す斜視図、図16は遮
光板の取付けを説明するための斜視図、図17は遮光板の
取付けを説明するための一部断面図、図18(a)，(b)はレ
ンズ位置センサの検出感度の説明図であり、ボビン２に
取付けられた前記遮光板23には、フォーカシング方向に
長いスリット23aが設けられていて、発光素子40からこ
のスリット23aを通過した光が、トラッキング方向に２
分割された受光面41aを持つ受光素子41に入射する。ス
リット23aは、前記受光面41aのフォーカシング方向Ｆの
寸法とボビン２のフォーカシング方向Ｆの可動ストロー
クの和より長くしてある。FIG. 14 is an exploded perspective view of the lens position sensor S,
15 is a perspective view showing the bottom surface of the housing of FIG. 14, FIG. 16 is a perspective view for explaining the attachment of the light shielding plate, FIG. 17 is a partial cross-sectional view for explaining the attachment of the light shielding plate, FIG. ) And (b) are explanatory views of the detection sensitivity of the lens position sensor. The light shielding plate 23 attached to the bobbin 2 is provided with a slit 23a long in the focusing direction, and the slits 23a from the light emitting element 40 are provided. The light that passes through is 2 in the tracking direction.
It is incident on the light receiving element 41 having the divided light receiving surface 41a. The slit 23a is longer than the sum of the dimension of the light receiving surface 41a in the focusing direction F and the movable stroke of the bobbin 2 in the focusing direction F.
【００３３】本実施例では、発光素子40として発光ダイ
オード、受光素子41としてフォートダイオードを用い
る。受光素子41は、受光量に応じた電気信号を出力し、
左右の受光面41aの出力の差によってボビン２，対物レ
ンズ１のトラッキング方向の位置を検出することができ
る。図16，17に示したように、遮光板23は、ボビン２の
対物レンズ載置面６に垂直に形成された位置決め面６a
に基準面23bが取付けられ、基準面23bと平行にスリット
23aが形成されているので、対物レンズ１の光軸とスリ
ット23aとの平行度は高精度に保たれている。またスリ
ット23aのフォーカシング方向Ｆの長さは、受光素子41
の受光面41aのフォーカシング方向の寸法とボビン２の
フォーカシング方向の可動ストロークの和よりも長くと
ってあるので、スリット23aを通過した光は、常に受光
面41aのフォーカシング方向全体に当り、受光素子41が
傾いていても、ボビン２がフォーカシング方向に移動し
た時に検出位置がずれることがない。In this embodiment, a light emitting diode is used as the light emitting element 40 and a Fort diode is used as the light receiving element 41. The light receiving element 41 outputs an electric signal according to the amount of received light,
The positions of the bobbin 2 and the objective lens 1 in the tracking direction can be detected by the difference between the outputs of the left and right light receiving surfaces 41a. As shown in FIGS. 16 and 17, the light shielding plate 23 is provided with a positioning surface 6a formed perpendicularly to the objective lens mounting surface 6 of the bobbin 2.
The reference surface 23b is attached to and is slit parallel to the reference surface 23b.
Since 23a is formed, the parallelism between the optical axis of the objective lens 1 and the slit 23a is maintained with high accuracy. The length of the slit 23a in the focusing direction F is determined by the light receiving element 41.
Since the dimension of the light receiving surface 41a in the focusing direction is longer than the sum of the movable stroke of the bobbin 2 in the focusing direction, the light passing through the slit 23a always strikes the entire light receiving surface 41a in the focusing direction, and the light receiving element 41a. Even if is tilted, the detection position does not shift when the bobbin 2 moves in the focusing direction.
【００３４】上記のように検出された位置信号は、対物
レンズ１と受光素子41＝キャリッジベース22＝三角プリ
ズム33との相対的な変位を表すので、この変位をゼロに
するようにキャリッジベース(＝受光素子41＝三角プリ
ズム33)22を移動させることによって、常に三角プリズ
ム33から対物レンズ１に入射する光束と対物レンズ１の
光軸とを一致させておくことができる。上記のレンズ位
置検出部はアクチュエータべース25のディスク外周側
(固定光学系側)に設けられ、これによってレンズ位置セ
ンサＳと図示しないスピンドルモータとが干渉しないよ
うにできるので、ディスク内周側のアクセス可能範囲が
広がる。The position signal detected as described above represents a relative displacement between the objective lens 1 and the light receiving element 41 = carriage base 22 = triangular prism 33, so that the carriage base ( = Light receiving element 41 = By moving the triangular prism 33) 22, the luminous flux incident on the objective lens 1 from the triangular prism 33 and the optical axis of the objective lens 1 can always be matched. The above lens position detector is on the outer circumference of the actuator base 25 disk.
It is provided on the (fixed optical system side) so that the lens position sensor S and the spindle motor (not shown) can be prevented from interfering with each other, so that the accessible range on the inner circumference side of the disk is widened.
【００３５】上記のレンズ位置検出部を組立るに際して
は、まず、発光素子40に取付けられたガイドプレート45
が、保持体であるハウジング46に設けられた受光素子41
の受光面41aに平行なガイド面46aに接するように発光素
子40をスライドさせて、左右の受光面41aの受光量が等
しくなるように(左右の受光面の出力の差がゼロとなる
ように)調整して固定する。アクチュエータベース25
に、図12のように、トラッキング方向に並べて設けられ
た２本のガイドピン47と、ハウジング46の下面に受光面
41aと平行に設けられたガイド溝48によってハウジング4
6がトラッキング方向に案内されており、ハウジング46
をスライドさせて、対物レンズ１がトラッキング方向の
中立位置にある時に遮光板23のスリット23aを通過した
光の左右の受光面41aの受光量が等しくなるように(左右
の受光面の出力の差がゼロとなるように)調整して、図
１のように、アクチュエータベース25の下面から貫通長
孔25bを通してネジＮ２でネジ止めする。ネジＮ２の位
置はピックアップユニットからの光束を遮らないように
ずらしてある。In assembling the above lens position detector, first, the guide plate 45 attached to the light emitting element 40 is used.
Is a light receiving element 41 provided in a housing 46 that is a holding body.
Slide the light emitting element 40 so as to contact the guide surface 46a parallel to the light receiving surface 41a, so that the light receiving amounts of the left and right light receiving surfaces 41a become equal (so that the difference between the outputs of the left and right light receiving surfaces becomes zero. ) Adjust and fix. Actuator base 25
As shown in FIG. 12, the two guide pins 47 arranged side by side in the tracking direction and the light receiving surface on the lower surface of the housing 46.
The housing 4 is provided by the guide groove 48 provided in parallel with 41a.
6 is guided in the tracking direction, and the housing 46
Slide so that when the objective lens 1 is at the neutral position in the tracking direction, the amount of light passing through the slit 23a of the light shielding plate 23 becomes equal on the left and right light receiving surfaces 41a (the difference between the outputs of the left and right light receiving surfaces). Is adjusted so that it becomes zero), and as shown in FIG. The position of the screw N2 is shifted so as not to block the light beam from the pickup unit.
【００３６】ところで、図18(a)に示したように、一般
に殆どの発光素子の光量分布は、中心部が強く、周辺部
にいくほど弱くなる。発光素子の調整を行うと、受光面
Ａ，Ｂの入射する光量分布Ｆｈは左右均等になり、スリ
ットＳＬの中心と分割線Ｃが一致した時に左右の受光面
Ａ，Ｂの出力の差がゼロとなる。図18(b)のように、遮
光板(＝対物レンズ)のスリットＳＬが右(または左)に
ａ′(ｂ′)分移動すると、光は全て受光面Ａ(またはＢ)
に入射するようになり、それ以上の位置検出はできな
い。つまり検出可能範囲はａ′，ｂ′である。発光素子
の受光分布Ｆｈ′がずれていると、スリットＳＬの中心
が分割線からずれた位置で左右の受光面の出力が差がゼ
ロとなる。この時の検出可能範囲は左右不均等になり、
片側の検出可能範囲が狭くなってしまう。また光量分布
の中心と分割線Ｃが一致していた方が、受光量が多いの
で検出感度が高く、光量分布がフラットなので感度のバ
ラツキも小さい。このため上記の受光量調整が必要とな
る。By the way, as shown in FIG. 18 (a), generally, the light amount distribution of most of the light emitting elements is strong in the central part and becomes weaker toward the peripheral part. When the light emitting elements are adjusted, the light amount distributions Fh incident on the light receiving surfaces A and B become equal to each other on the left and right, and when the center of the slit SL and the dividing line C coincide with each other, the output difference between the left and right light receiving surfaces A and B is zero. Becomes As shown in FIG. 18 (b), when the slit SL of the light blocking plate (= objective lens) is moved to the right (or left) by a '(b'), all the light is received on the light receiving surface A (or B).
The incident light will be incident on, and the position cannot be detected any further. That is, the detectable range is a ', b'. If the light receiving distribution Fh 'of the light emitting element is deviated, the difference between the outputs of the left and right light receiving surfaces becomes zero at the position where the center of the slit SL deviates from the dividing line. The detectable range at this time becomes uneven on the left and right,
The detectable range on one side is narrowed. Further, when the center of the light amount distribution and the dividing line C are coincident with each other, the amount of received light is large, so that the detection sensitivity is high, and since the light amount distribution is flat, variations in sensitivity are small. Therefore, it is necessary to adjust the amount of received light.
【００３７】また前記発光素子40と受光素子41へは図１
のレンズ位置センサ用フレキシブルケーブル50を通して
給電される。レンズ位置センサ用フレキシブルケーブル
50はハウジング46を巻くように両面テープ等で貼着さ
れ、キャリッジ側ランド部は板バネ固定部材18に取り付
けられたアクチュエータ用フレキシブルケーブル21のラ
ンド部に接続される。The light emitting element 40 and the light receiving element 41 are shown in FIG.
Power is supplied through the lens position sensor flexible cable 50. Flexible cable for lens position sensor
The housing 50 is attached by a double-sided tape or the like so as to wind the housing 46, and the carriage-side land portion is connected to the land portion of the actuator flexible cable 21 attached to the leaf spring fixing member 18.
【００３８】[0038]
【発明の効果】以上説明したように、本発明によれば、
可動体に対して対物レンズは光軸方向と外径の位置決め
がなされ、アパーチャ周部と対物レンズの光束透過面が
接触しないので、組立時に誤って対物レンズを傾けて載
置してしまっても対物レンズに損傷を与えることが防止
され、またアパーチャの対物レンズ側に傾斜面を設け、
エッジをなくすことによりアパーチャの最小径部のエッ
ジで生じる回折を抑制でき、また対物レンズ嵌合部の切
欠部と対物レンズの側面で形成される凹部に接着剤を付
けて対物レンズを可動体に固定したので、接着剤が対物
レンズの上下面へ流れ込むことなく確実な固定ができ、
さらに対物レンズ載置部の外周の凹欠部によって接着剤
が対物レンズの全周に回り込んで接着強度をより増すこ
とができるため、対物レンズを、光学的性能を劣化させ
ることなく、容易かつ確実に固定できる対物レンズアク
チュエータを提供できる。As described above, according to the present invention,
The objective lens is positioned in the direction of the optical axis and the outer diameter with respect to the movable body, and since the aperture peripheral part and the light flux transmitting surface of the objective lens do not contact, even if the objective lens is accidentally placed while tilted. Damage to the objective lens is prevented, and an inclined surface is provided on the objective lens side of the aperture.
By eliminating the edge, diffraction that occurs at the edge of the smallest diameter part of the aperture can be suppressed, and adhesive is attached to the notch of the objective lens fitting part and the concave part formed on the side surface of the objective lens to make the objective lens a movable body. Since it is fixed, the adhesive can be securely fixed without flowing into the upper and lower surfaces of the objective lens,
Further, since the adhesive can wrap around the entire circumference of the objective lens by the recessed portion on the outer periphery of the objective lens mounting portion to further increase the adhesive strength, the objective lens can be easily and easily maintained without deteriorating its optical performance. An objective lens actuator that can be reliably fixed can be provided.
【図１】本発明の対物レンズアクチュエータの一実施例
を示す分解斜視図である。FIG. 1 is an exploded perspective view showing an embodiment of an objective lens actuator of the present invention.
【図２】対物レンズ取付部を一部断面した斜視図であ
る。FIG. 2 is a perspective view in which an objective lens mounting portion is partially sectioned.
【図３】図２の対物レンズ取付時の状態の断面図であ
る。FIG. 3 is a sectional view showing a state where the objective lens of FIG. 2 is attached.
【図４】図２の接着部分の斜視図である。FIG. 4 is a perspective view of an adhesive portion of FIG.
【図５】図２のアパーチャ部分の成形方法の説明図であ
る。5 is an explanatory diagram of a method of forming the aperture portion of FIG.
【図６】ボビンにおける対物レンズ取付部の他の例を示
す平面図である。FIG. 6 is a plan view showing another example of the objective lens attachment portion of the bobbin.
【図７】図６におけるｘ−ｘ線断面図である。7 is a sectional view taken along line xx in FIG.
【図８】図６，図７の対物レンズ取付部の接着部分の説
明図である。FIG. 8 is an explanatory diagram of a bonded portion of the objective lens mounting portion of FIGS. 6 and 7.
【図９】板バネ取付部の分解斜視図である。FIG. 9 is an exploded perspective view of a leaf spring mounting portion.
【図１０】板バネの一方端の固定方法の説明図である。FIG. 10 is an explanatory diagram of a method of fixing one end of a leaf spring.
【図１１】板バネの他方端の固定方法の説明図である。FIG. 11 is an explanatory diagram of a method of fixing the other end of the leaf spring.
【図１２】アクチュエータベースの一部を切断して示し
た斜視図である。FIG. 12 is a perspective view showing a part of the actuator base by cutting.
【図１３】ボビンとキャリッジベースとの支持機構部分
の断面図である。FIG. 13 is a sectional view of a supporting mechanism portion for a bobbin and a carriage base.
【図１４】レンズ位置センサの分解斜視図である。FIG. 14 is an exploded perspective view of a lens position sensor.
【図１５】図14のハウジングの底面を示す斜視図であ
る。15 is a perspective view showing a bottom surface of the housing of FIG. 14. FIG.
【図１６】遮光板の取付けを説明するための斜視図であ
る。FIG. 16 is a perspective view for explaining attachment of a light shielding plate.
【図１７】遮光板の取付けを説明するための一部断面図
である。FIG. 17 is a partial cross-sectional view for explaining attachment of the light shielding plate.
【図１８】レンズ位置センサの検出感度の説明図であ
る。FIG. 18 is an explanatory diagram of detection sensitivity of a lens position sensor.
１…対物レンズ、 ２…ボビン(可動体)、 ３，４…コ
イル(駆動手段)、 ６…対物レンズ載置面、 ６a…凹
欠部、 ７…対物レンズ嵌合部、 ８…アパーチャ、
９…面取り(傾斜面)、 10…切り欠き(切欠部)、 11…
接着剤、 12…成形型、 Ｏ…凹部。DESCRIPTION OF SYMBOLS 1 ... Objective lens, 2 ... Bobbin (movable body), 3, 4 ... Coil (driving means), 6 ... Objective lens mounting surface, 6a ... Recessed part, 7 ... Objective lens fitting part, 8 ... Aperture,
9 ... Chamfer (slope), 10 ... Notch (notch), 11 ...
Adhesive, 12 ... Mold, O ... Recess.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 木船 英明 東京都大田区中馬込１丁目３番６号 株式 会社リコー内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hideaki Kibune 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.
Claims (4)
媒体に集光する対物レンズと、対物レンズが搭載され、
かつ少なくとも記録媒体に対して接離する方向に移動自
在に支持された可動体と、可動体を駆動して対物レンズ
の焦点制御を行う駆動手段とを有する対物レンズアクチ
ュエータにおいて、前記可動体に、対物レンズが載置さ
れて可動体に対する対物レンズの光軸方向の位置決めを
する対物レンズ載置面と、対物レンズの外径の位置決め
をする対物レンズ嵌合部と、対物レンズ載置面から距離
をおいて対物レンズに入射する光束の径を決定する円筒
状のアパーチャを形成したことを特徴とする対物レンズ
アクチュエータ。1. An objective lens for condensing a light beam on an optical recording medium for recording and reproducing information, and an objective lens mounted thereon,
And an objective lens actuator having at least a movable body movably supported in a direction of approaching and separating from a recording medium, and a drive means for driving the movable body to perform focus control of the objective lens, wherein the movable body has: The objective lens mounting surface for positioning the objective lens in the optical axis direction with respect to the movable body, the objective lens fitting portion for positioning the outer diameter of the objective lens, and the distance from the objective lens mounting surface An objective lens actuator, characterized in that a cylindrical aperture for determining a diameter of a light beam incident on the objective lens is formed.
を形成したことを特徴とする請求項１の対物レンズアク
チュエータ。2. The objective lens actuator according to claim 1, wherein an inclined surface is formed on the side of the aperture toward the objective lens.
所に対物レンズの光軸に対して対称に切欠部を設け、こ
の切欠部と対物レンズの側面で形成される凹部に接着剤
を設けて対物レンズを前記可動部に固定したことを特徴
とする請求項１の対物レンズアクチュエータ。3. A notch is provided symmetrically with respect to the optical axis of the objective lens in at least two positions of the objective lens fitting part, and an adhesive is provided in a recess formed between the notch and the side surface of the objective lens. The objective lens actuator according to claim 1, wherein an objective lens is fixed to the movable portion.
設け、さらに前記対物レンズ嵌合部の切欠部を対物レン
ズ載置面より低い位置まで形成したことを特徴とする請
求項３の対物レンズアクチュエータ。4. A concave cutout is provided on the outer periphery of the objective lens mounting surface, and the cutout of the objective lens fitting portion is formed to a position lower than the objective lens mounting surface. Objective lens actuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04003243A JP3087144B2 (en) | 1992-01-10 | 1992-01-10 | Objective lens actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04003243A JP3087144B2 (en) | 1992-01-10 | 1992-01-10 | Objective lens actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05189785A true JPH05189785A (en) | 1993-07-30 |
| JP3087144B2 JP3087144B2 (en) | 2000-09-11 |
Family
ID=11552019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04003243A Expired - Lifetime JP3087144B2 (en) | 1992-01-10 | 1992-01-10 | Objective lens actuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3087144B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007058924A (en) * | 2005-08-22 | 2007-03-08 | Konica Minolta Opto Inc | Objective lens unit and optical pickup device |
| US7570546B2 (en) | 2005-04-14 | 2009-08-04 | Canon Kabushiki Kaisha | Optical pick-up and optical disk device |
-
1992
- 1992-01-10 JP JP04003243A patent/JP3087144B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7570546B2 (en) | 2005-04-14 | 2009-08-04 | Canon Kabushiki Kaisha | Optical pick-up and optical disk device |
| JP2007058924A (en) * | 2005-08-22 | 2007-03-08 | Konica Minolta Opto Inc | Objective lens unit and optical pickup device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3087144B2 (en) | 2000-09-11 |
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