JPH0821941A - Optical device holding member driving device - Google Patents

Abstract

PURPOSE:To provide an optical device holding member driving device in which an optical device holding member can be smoothly driven freely forward and backward and in which simplification is possible on driving control itself. CONSTITUTION:This device is provided with a holder 14 holding a CCD 55, guide shafts 7 and 8 slidably supporting the holder 14 in the optical axis O direction, a flexible circuit substrate(FCP) 56 for electric interface for the CCD 55, and a VCM(voice coil motor) for driving the CCD holder which is constituted of a coil and a magnet. The difference of resistance on the reciprocating driving of the holder 14 which is caused by loading resistance in the optical direction of the FPC 56, etc., can be eliminated by setting the centroid position of the holder 14.

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、光学素子保持部材駆動
装置、詳しくは、光学素子保持部材を電磁アクチュエー
タにより進退駆動する光学素子保持部材駆動装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical element holding member driving device, and more particularly to an optical element holding member driving device for driving an optical element holding member forward and backward by an electromagnetic actuator.

【０００２】[0002]

【従来の技術】従来、撮影レンズ、または、撮像素子を
光軸方向に移動させて合焦、または、変倍を行うカメラ
において、光学素子保持部材であるレンズ、または、撮
像素子保持枠の駆動手段として、円筒状のスリーブ部と
Ｕ字状の回転止め部を有している上記レンズ保持枠を２
本のシャフトで摺動自在に支持し、後述するボイスコイ
ルモータ（以下、ＶＣＭと記載する）を駆動源として上
記レンズ、または、撮像素子保持枠を直接的に駆動する
構造がある。2. Description of the Related Art Conventionally, in a camera that performs focusing or zooming by moving an image pickup lens or an image pickup device in the optical axis direction, a lens that is an optical element holding member or an image pickup device holding frame is driven. As means, the lens holding frame having a cylindrical sleeve portion and a U-shaped rotation stopping portion is
There is a structure in which a shaft of a book is slidably supported and a lens or an image pickup device holding frame is directly driven by using a voice coil motor (hereinafter, referred to as VCM) described later as a drive source.

【０００３】上記ＶＣＭの構造は、上記レンズ、また
は、撮像素子保持枠と一体的に銅線を巻付けてコイル部
を形成し、同時に、レンズ保持枠の摺動運動に伴って、
前記コイル部が進退する位置に磁気回路を形成するヨー
ク部を配設したものであり、前記コイルに通電するとフ
レミングの左手の法則に従って、レンズ光軸方向の推力
を得るような構造を有している。そして、コイルへの通
電や保持枠上に搭載される撮像素子やレンズ位置検出用
のセンサ等の制御部等への通電のための電気的インター
フェイスとして、フレキシブル回路基板（以下、ＦＰＣ
と記載する）が用いられることが多い。In the structure of the VCM, a copper wire is wound integrally with the lens or the image pickup device holding frame to form a coil portion, and at the same time, with the sliding movement of the lens holding frame,
The coil portion is provided with a yoke portion that forms a magnetic circuit at a position where the coil portion advances and retracts, and has a structure such that when the coil is energized, a thrust force in the lens optical axis direction is obtained according to Fleming's left-hand rule. There is. A flexible circuit board (hereinafter referred to as an FPC) is used as an electrical interface for energizing the coil and energizing a control unit such as an image sensor mounted on the holding frame and a sensor for detecting a lens position.
Is described) is often used.

【０００４】なお、上記ＶＣＭを駆動源としたレンズ駆
動装置として提案されたものに特開平４−２５８１１号
公報に開示のカメラ用レンズ鏡筒がある。A lens barrel for a camera disclosed in JP-A-4-25811 is proposed as a lens driving device using the VCM as a driving source.

【０００５】[0005]

【発明が解決しようとする課題】上述のように従来のレ
ンズまたは撮像素子保持部材駆動装置においては、ＶＣ
Ｍを駆動する際にレンズ鏡筒本体と可動部となる光学部
材保持枠であるレンズ保持枠との電気的インターフェイ
スとなるＦＰＣが必要となるが、進退駆動時に上記ＦＰ
Ｃの変形をさせる必要があって、その力が機械的な負荷
として作用する。As described above, in the conventional lens or image pickup element holding member driving device, the VC
When driving M, an FPC that becomes an electrical interface between the lens barrel main body and a lens holding frame that is an optical member holding frame that is a movable part is required.
It is necessary to deform C, and the force acts as a mechanical load.

【０００６】このＦＰＣは、小型化が重視されるレンズ
保持枠を内蔵するレンズ鏡筒において、レイアウトの自
由度が小さく、結果として、前記ＦＰＣによる負荷がレ
ンズ保持枠の駆動方向に対して前後方向で同程度となる
ような構成を取るのは非常に困難であることが実情であ
る。このような状態では、レンズを被写体側に移動させ
る時と撮影者側に移動させる時とで負荷が変わってしま
う。そして、レンズを同じ量移動させる場合でも駆動方
向によって、上記ＶＣＭへの通電電流値を変える必要が
あるなど制御上で問題がある。This FPC has a small degree of freedom in layout in a lens barrel incorporating a lens holding frame in which downsizing is important, and as a result, the load of the FPC is forward and backward with respect to the driving direction of the lens holding frame. In reality, it is very difficult to adopt a configuration in which the same level is achieved. In such a state, the load changes depending on whether the lens is moved to the subject side or the photographer side. Then, even when the lens is moved by the same amount, there is a problem in control such that it is necessary to change the value of the current supplied to the VCM depending on the driving direction.

【０００７】前述した特開平４−２５８１１号公報に開
示のカメラ用レンズ鏡筒においては、ＶＣＭに対する上
述のような負荷変動に対する考慮はなされていない。な
お、アクチュエータで進退駆動される光学素子保持部材
は、上述のように撮影レンズや撮像素子に限らず、他の
光学部材用の保持部材も対象となる。In the camera lens barrel disclosed in the above-mentioned Japanese Patent Laid-Open No. 4-25811, no consideration is given to the above-mentioned load variation with respect to the VCM. The optical element holding member that is driven back and forth by the actuator is not limited to the taking lens and the image pickup element as described above, and holding members for other optical members are also applicable.

【０００８】本発明は、上述の不具合を解決するために
なされたもので、電磁アクチュエータによるレンズ駆動
の方向に対して常に同程度の負荷が得られ、駆動制御が
容易となるような装置を提供することを目的とする。The present invention has been made in order to solve the above-mentioned problems, and provides an apparatus in which a similar load is always obtained in the direction of lens driving by an electromagnetic actuator and drive control is facilitated. The purpose is to do.

【０００９】[0009]

【課題を解決するための手段および作用】本発明の１つ
の光学素子保持部材駆動装置は、スリーブ部と回り止め
部を有しこれらがガイド部材によりガイドされ光軸に沿
って移動可能な光学素子保持部材と、光学素子保持部材
に連結され光学素子保持部材に外部から負荷を及ぼすフ
レキシブル回路基板と、光学素子保持部材を駆動する電
磁アクチュエータを具備する光学素子保持部材駆動装置
であって、電磁アクチュエータによる光学素子保持部材
の駆動方向に拘らずスリーブ部にかかる負荷がほぼ一定
となるように、光学素子保持部材を含め一体的に移動可
能な可動体の重心位置を定める。上記光学素子保持部材
駆動装置においては、上記光学素子保持部材は電磁アク
チュエータにより、その進退方向による負荷の変化が少
ない状態で駆動される。One optical element holding member driving device of the present invention is an optical element having a sleeve portion and a rotation stopping portion, which are guided by a guide member and are movable along the optical axis. An optical element holding member driving device, comprising: a holding member; a flexible circuit board connected to the optical element holding member to apply a load to the optical element holding member from the outside; and an electromagnetic actuator for driving the optical element holding member. The center of gravity of the movable body including the optical element holding member is determined so that the load applied to the sleeve portion is substantially constant regardless of the driving direction of the optical element holding member. In the above-mentioned optical element holding member driving device, the optical element holding member is driven by the electromagnetic actuator in a state in which the change in the load depending on the advancing / retreating direction is small.

【００１０】本発明の他の１つの光学素子保持部材駆動
装置は、請求項１記載の光学素子保持部材駆動装置にお
いて、フレキシブル回路基板が光学素子保持部材にその
移動方向に沿った方向の負荷を及ぼすように連結されて
おり、上記光学素子保持部材は電磁アクチュエータによ
り、その進退方向による負荷の変化が少ない状態で駆動
される。Another optical element holding member driving device according to the present invention is the optical element holding member driving device according to claim 1, wherein the flexible circuit board applies a load to the optical element holding member in a direction along the moving direction thereof. The optical element holding member is connected so as to exert an influence, and is driven by the electromagnetic actuator in a state in which the change in load due to the advancing / retreating direction is small.

【００１１】本発明の他の１つの光学素子保持部材駆動
装置は、スリーブ部と回り止め部を有しこれらがガイド
部材によりガイドされ光軸に沿って移動可能な光学素子
保持部材と、光学素子保持部材を駆動する電磁アクチュ
エータを具備する光学素子保持部材駆動装置であって、
電磁アクチュエータによる光学素子保持部材の駆動方向
に拘らずスリーブ部にかかる負荷がほぼ一定となるよう
に、光学素子保持部材を含め一体的に移動可能な可動体
の重心位置を定める。上記光学素子保持部材駆動装置に
おいても上記光学素子保持部材は電磁アクチュエータに
より、その進退方向による負荷の変化が少ない状態で駆
動される。Another optical element holding member driving device of the present invention is an optical element holding member which has a sleeve portion and a rotation stopping portion and which are guided by a guide member and are movable along the optical axis. An optical element holding member driving device comprising an electromagnetic actuator for driving a holding member,
The center of gravity of the movable body including the optical element holding member is determined so that the load applied to the sleeve portion is substantially constant regardless of the driving direction of the optical element holding member by the electromagnetic actuator. Also in the optical element holding member driving device, the optical element holding member is driven by the electromagnetic actuator in a state where the change in load due to the advancing / retreating direction is small.

【００１２】[0012]

【実施例】以下、本発明の実施例を図に基づいて説明す
る。図１〜図４は、本発明の一実施例の光学素子駆動装
置が内蔵されるレンズ鏡筒の分解斜視図である。また、
図５は、上記レンズ鏡筒の縦断面図である。本実施例の
レンズ鏡筒は、４群構成のズームレンズ鏡筒であって、
ズーミングは、ステッパ（ステッピングモータ）を駆動
源としてカム環３を回動することによって各レンズ群保
持枠を進退させて行う。また、フォーカシングは、光学
素子である撮像素子のＣＣＤ５５、光学フィルタ５４を
保持する光学素子保持部材としてのＣＣＤホルダ１４自
体を電磁アクチュエータであるＶＣＭ（ボイスコイルモ
ータ）により進退駆動させることによって行う。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 are exploded perspective views of a lens barrel in which an optical element driving device according to an embodiment of the present invention is incorporated. Also,
FIG. 5 is a vertical sectional view of the lens barrel. The lens barrel of the present embodiment is a zoom lens barrel having a four-group configuration,
Zooming is performed by moving the cam ring 3 using a stepper (stepping motor) as a drive source to advance and retract each lens group holding frame. Focusing is performed by driving the CCD 55, which is an optical element, such as an image sensor, and the CCD holder 14, which is an optical element holding member that holds the optical filter 54, itself back and forth by a VCM (voice coil motor), which is an electromagnetic actuator.

【００１３】そして、本レンズ鏡筒は、上記の斜視図
（図１〜４），断面図（図５）等に示すように、主に後
述する各固定枠を介してカメラ本体に固着される外固定
枠１と、１群レンズ４１を保持し、３つのカムフォロワ
２２ａを介してカム環３のカム溝３ａにより進退自在
な、所謂、３本吊り構造を有するレンズ保持枠の１つで
ある１群枠２と、各保持枠を駆動するためのカム溝３
ａ，３ｂ，３ｃ，３ｄが配設されている回動自在なカム
環３と、カム環付勢用の波形ワッシャ４と、上記外固定
枠１に固着される内固定枠５とを有している。As shown in the above perspective views (FIGS. 1 to 4) and sectional view (FIG. 5), the present lens barrel is fixed to the camera main body mainly through each fixing frame described later. It is one of the lens holding frames having a so-called three-suspension structure that holds the outer fixed frame 1 and the first group lens 41 and can be moved back and forth by the cam groove 3a of the cam ring 3 via the three cam followers 22a. Group frame 2 and cam groove 3 for driving each holding frame
It has a rotatable cam ring 3 on which a, 3b, 3c, 3d are arranged, a corrugated washer 4 for urging the cam ring, and an inner fixed frame 5 fixed to the outer fixed frame 1. ing.

【００１４】更に、該レンズ鏡筒は、１群枠２以外の各
鏡枠およびＣＣＤホルダ１４を進退自在に支持するガイ
ド軸７，８と、２群レンズ４２を保持し、上記ガイド軸
７，８で支持される進退自在なレンズ保持枠である２群
枠９と、３群レンズ４３を保持し、上記ガイド軸７，８
で支持される進退自在なレンズ保持枠である３群枠１０
と、４群レンズ４４を保持し、上記ガイド軸７，８で支
持される進退自在なレンズ保持枠である４群枠１１と、
ＣＣＤ駆動用の電磁アクチュエータであるＶＣＭを構成
するヨーク１２と、上記ガイド軸７，８、上記ヨーク１
２を支持する後固定枠１３と有している。Further, the lens barrel holds guide shafts 7 and 8 for movably advancing and retracting each lens frame other than the first group frame 2 and the CCD holder 14, and the second group lens 42. The second group frame 9 which is a lens holding frame which is supported by 8 and which can freely move back and forth, and the third group lens 43 are held, and the guide shafts 7 and 8 are provided.
A third group frame 10 which is a lens holding frame which is supported by
And a fourth group frame 11 which is a lens holding frame which holds the fourth group lens 44 and is supported by the guide shafts 7 and 8 and which can move back and forth.
A yoke 12 that constitutes a VCM that is an electromagnetic actuator for driving a CCD, the guide shafts 7 and 8, and the yoke 1
It has with the rear fixed frame 13 which supports 2.

【００１５】また更に、該レンズ鏡筒は、上記ガイド軸
７，８で摺動自在に支持され、ＣＣＤ５５とＬＰＦ５４
を保持し、進退位置検出用の発光素子であるＬＥＤ６１
が取付けられ、また、自己を進退駆動するＶＣＭを構成
する駆動コイル１４ｂが巻回されているＣＣＤホルダ１
４と、上記ＬＰＦ５４と、上記ＣＣＤ５５と、上記ガイ
ド軸７，８の軸方向の規制を行う後カバ−１５と、上記
カム環の回動駆動用であって、ステッパ５１を駆動源と
するカム環駆動部と、上記ＣＣＤホルダ１４の進退位置
を検出する位置検出手段であって、後固定枠１３側に支
持され、前記ＬＥＤ６１からの光を受光し、位置を検出
するＰＳＤ６２とを有している。Furthermore, the lens barrel is slidably supported by the guide shafts 7 and 8, and the CCD 55 and the LPF 54 are provided.
The LED 61 which is a light emitting element for detecting the advancing / retreating position.
Is attached, and a CCD holder 1 around which a drive coil 14b that constitutes a VCM that drives itself forward and backward is wound.
4, the LPF 54, the CCD 55, the rear cover 15 that restricts the guide shafts 7 and 8 in the axial direction, and the cam for rotating the cam ring and using the stepper 51 as a drive source. A ring drive unit and position detection means for detecting the forward / backward movement position of the CCD holder 14, and a PSD 62 supported by the rear fixed frame 13 side, receiving the light from the LED 61, and detecting the position. There is.

【００１６】上記外固定枠１と内固定枠５と後固定枠１
３は、以下に説明する各構成部材を組み込んだ状態でそ
れぞれの取り付け穴１ａと５ａ′，５ａと１３ａを介し
ビスにより一体的に固着されるものとする。なお、該固
着時での上記各枠１，１３の回転方向の相対位置決め
は、位置決めピン１ｂ，１３ｂを内固定枠５の位置決め
穴５ｂに嵌入することによって行う。The outer fixed frame 1, the inner fixed frame 5, and the rear fixed frame 1
3 is integrally fixed with screws through the respective mounting holes 1a and 5a ', 5a and 13a in a state where the respective constituent members described below are incorporated. The relative positioning of the frames 1 and 13 in the rotational direction at the time of fixing is performed by fitting the positioning pins 1b and 13b into the positioning holes 5b of the inner fixed frame 5.

【００１７】そして、上記外固定枠１には、上記１群枠
２が回動が規制された状態で進退自在に挿入されるが、
該回動規制は、外固定枠１の内周部に配設される直進案
内溝１ｊに１群枠２のピン２２に同軸的に設けられたボ
ス２３が嵌入して、その回動が規制される。ここで、ボ
ス２３の代わりにピン２２にローラを支持し、これを直
進案内溝１ｊに嵌入するようにしてもよい。なお、１群
枠２のズーミング時の進退駆動は、後述するカム環３の
回動によって行われる。The first group frame 2 is inserted into the outer fixed frame 1 so as to be movable back and forth with its rotation restricted.
The rotation is restricted by inserting a boss 23 coaxially provided with the pin 22 of the first group frame 2 into the straight guide groove 1j arranged on the inner peripheral portion of the outer fixed frame 1 to restrict the rotation. To be done. Here, instead of the boss 23, a roller may be supported by the pin 22 and fitted into the straight guide groove 1j. The forward / backward drive of the first group frame 2 during zooming is performed by the rotation of a cam ring 3 described later.

【００１８】また、外固定枠１の内周部には、進退方向
に沿って下方に線状の基準案内部となる凸部１ｄ，１ｅ
が、また、上方に線状の凸部１ｆ，１ｇがそれぞれ設け
られている。更に、上方の中央部の開口１ｉには、付勢
部材である板バネ２１が取り付け部１ｈにネジ止めされ
ている。上記１群枠２が凸部１ｄ，１ｅ，１ｆ，１ｇに
対して機構上、または、部品精度上必要とされる嵌合ガ
タのある状態で嵌入されたとしても、該１群枠２が下方
に付勢され、その外周が上記凸部１ｄ，１ｅ側に当接し
た状態になる。ズーミング動作中は、この状態で１群枠
２は進退移動し、また、通常の撮影状態では、必ずこの
当接状態が保持され、１群レンズ４１の鏡筒光軸Ｏに対
する傾きの発生が皆無になる。また、１群枠２に上方向
の外力が作用した場合、１群枠２の外周が凸部１ｆ，１
ｇに当接するまで僅かに動くのみである。Further, on the inner peripheral portion of the outer fixed frame 1, convex portions 1d and 1e which are linear reference guide portions are formed downward along the advancing / retreating direction.
However, linear projections 1f and 1g are provided on the upper side. Further, a leaf spring 21, which is a biasing member, is screwed to the mounting portion 1h in the opening 1i at the upper center. Even if the above-mentioned first group frame 2 is fitted in the convex portions 1d, 1e, 1f, 1g in a state where there is a fitting backlash required for mechanical or component precision, the first group frame 2 is downward. And the outer periphery thereof is in contact with the convex portions 1d and 1e. During the zooming operation, the first group frame 2 moves forward and backward in this state, and in the normal photographing state, this contact state is always maintained, and the first group lens 41 does not tilt with respect to the lens barrel optical axis O. become. In addition, when an upward external force is applied to the first-group frame 2, the outer circumference of the first-group frame 2 has convex portions 1f, 1
It only moves slightly until it contacts g.

【００１９】前記カム環３は、上記１群枠２の内周部に
回動自在に嵌入され、更に、カム環３の内周部に内固定
枠５が嵌入される。但し、上記内固定枠５の外周には波
形ワッシャ４が挿入されており、該波形ワッシャ４はカ
ム環３のフランジ部３ｈを外固定枠１のフランジ部１ｃ
に当接するように押圧する。この押圧付勢により上記１
群枠２が内外固定枠５，１に対してその光軸方向の位置
決めがなされる。また、上記波形ワッシャ４は、その内
周に設けられた溝４ａが内固定枠５の凸部５ｅに嵌入し
た状態で挿入されるので、その回転は規制される。The cam ring 3 is rotatably fitted into the inner peripheral portion of the first group frame 2, and further, the inner fixed frame 5 is fitted into the inner peripheral portion of the cam ring 3. However, a corrugated washer 4 is inserted on the outer periphery of the inner fixed frame 5, and the corrugated washer 4 has a flange portion 3h of the cam ring 3 and a flange portion 1c of the outer fixed frame 1.
Press so as to abut. Due to this pressing force, the above 1
The group frame 2 is positioned with respect to the inner and outer fixed frames 5 and 1 in the optical axis direction. Further, since the corrugated washer 4 is inserted with the groove 4a provided on the inner periphery thereof fitted in the convex portion 5e of the inner fixed frame 5, its rotation is restricted.

【００２０】上記カム環３のフランジ部外周に沿ってギ
ヤー部３ｉが設けられているが、このギヤー部３ｉには
後述するカム環駆動部の駆動ギヤー３４ａが固定枠１の
溝１ｍを通して噛合しており、該駆動部によりカム環３
がワイド位置からテレ位置まで回動される。A gear portion 3i is provided along the outer circumference of the flange portion of the cam ring 3, and a drive gear 34a of a cam ring driving portion described later meshes with the gear portion 3i through a groove 1m of the fixed frame 1. And the cam ring 3 is driven by the drive unit.
Is rotated from the wide position to the tele position.

【００２１】該ワイド位置は、フランジ部に設けられた
遮閉リーフ部３ｊがその回動軌跡上の上記ワイド位置に
対応した回動位置に配設されているＰＩ（フォトインタ
ラプタ）５３により検出される。このワイド位置を基準
として各ズーミング位置の位置出しが行われる。The wide position is detected by a PI (photo interrupter) 53 in which the shielding leaf portion 3j provided on the flange portion is arranged at a rotation position corresponding to the wide position on the rotation locus. It Positioning of each zooming position is performed on the basis of the wide position.

【００２２】カム環３のフランジ部に配設されている突
起状のストッパ３ｋは、外固定枠１のフランジ部１ｃに
配設される溝部１ｋに挿入されており、カム環３のワイ
ド端、または、テレ端の回動ストッパとして作用する。
カム環３の外周部に設けられている１群枠用カム溝３ａ
は３ヶ所あり、それぞれに前記１群枠２のカムフォロワ
２２ａが摺動自在に嵌入する。該１群枠２は、その回動
が規制されており、該カム環３が回動すると光軸Ｏ方向
に進退移動することになる。The protrusion-like stopper 3k provided on the flange portion of the cam ring 3 is inserted into the groove portion 1k provided on the flange portion 1c of the outer fixed frame 1, and the wide end of the cam ring 3 is Alternatively, it acts as a rotation stopper at the tele end.
First group frame cam groove 3a provided on the outer peripheral portion of the cam ring 3.
There are three places, and the cam followers 22a of the first-group frame 2 are slidably fitted into the respective three places. The rotation of the first group frame 2 is restricted, and when the cam ring 3 rotates, it moves forward and backward in the optical axis O direction.

【００２３】更に、カム環３の内周部には２，３，４群
枠用カム溝３ｂ，３ｃ，３ｄが設けられており、それぞ
れに前記２，３，４群枠９，１０，１１に固着されてい
るカムフォロワ９ｃ，１０ｃ，１１ｃが摺動自在に嵌入
する。該カム環３が回動すると上記各保持枠は、光軸Ｏ
方向に進退移動することになる。前記カム環駆動部は、
ステッパ５１を駆動源とするが、その出力ギヤーの回転
は、ギヤー列を介して駆動ギヤー３４ａに伝達され、更
に、前記カム環３のギヤー部３ｉに伝達される。Further, cam grooves 3b, 3c and 3d for the second, third and fourth group frames are provided on the inner peripheral portion of the cam ring 3, and the second, third and fourth group frames 9, 10, 11 are respectively provided. The cam followers 9c, 10c, 11c fixed to the above are slidably fitted. When the cam ring 3 rotates, the holding frames move to the optical axis O.
It will move back and forth in the direction. The cam ring drive section,
Although the stepper 51 is used as a drive source, the rotation of the output gear thereof is transmitted to the drive gear 34a via the gear train and further transmitted to the gear portion 3i of the cam ring 3.

【００２４】前記ガイド軸７，８の支持構造としては、
上記内固定枠５に該ガイド軸７，８の前方（被写体側）
の端部を支持する支持穴５ｆ，５ｇが設けられており、
そこにガイド軸７，８の端部が挿入され、ラジアル方向
が位置決めされ、更に、被写体側方向の光軸方向の規制
がなされる。The support structure for the guide shafts 7 and 8 is as follows.
In front of the guide shafts 7 and 8 on the inner fixed frame 5 (subject side)
Support holes 5f and 5g for supporting the end of the
The ends of the guide shafts 7 and 8 are inserted therein, the radial direction is positioned, and further, the subject side direction is restricted in the optical axis direction.

【００２５】そして、該ガイド軸７，８の略中間部位
は、後固定枠１３の軸穴１３ｆ，１３ｇによりラジアル
方向の位置決めがなされた状態で支持される。上記軸穴
１３ｆと軸穴１３ｇの光軸方向の配設位置は、後述する
ようにレンズ保持枠やＣＣＤホルダの支持構造上、都合
がよいようにずらして配設し、軸穴１３ｇの方を前方、
即ち、被写体側に位置している。そして、ＣＣＤホルダ
１４を挿入後、該ガイド軸７，８の後方（ＣＣＤ側）の
端部は、該後固定枠１３に固着される後カバ−１５の有
底穴１５ｆ，１５ｇにて光軸方向の規制され、押さえら
れている。Then, substantially intermediate portions of the guide shafts 7 and 8 are supported by the axial holes 13f and 13g of the rear fixed frame 13 in a state of being positioned in the radial direction. The positions of the shaft hole 13f and the shaft hole 13g in the optical axis direction are shifted so as to be convenient because of the support structure of the lens holding frame and the CCD holder, as will be described later. Forward,
That is, it is located on the subject side. After the CCD holder 14 is inserted, the rear (CCD side) end portions of the guide shafts 7 and 8 are attached to the rear fixing frame 13 by the bottomed holes 15f and 15g of the rear cover 15 and the optical axes. The direction is regulated and held down.

【００２６】上記ガイド軸７，８は、内固定枠５と後固
定枠１３との間で２群枠９，３群枠１０，４群枠１１を
摺動自在に支持している。即ち、ガイド軸７には２群枠
９の２又部９ｆ，３群枠１０，４群枠１１の軸穴部１０
ｆ，１１ｆが嵌入する。ガイド軸８には２群枠９の軸穴
部９ｇ，３群枠１０，４群枠１１の２又部１０ｇ，１１
ｇが嵌入し、該枠９，１０，１１が上記内固定枠５の内
部に収納した状態で摺動自在に支持される。The guide shafts 7 and 8 slidably support the second group frame 9, the third group frame 10 and the fourth group frame 11 between the inner fixed frame 5 and the rear fixed frame 13. That is, the guide shaft 7 has a forked portion 9f of the second group frame 9, a third group frame 10, and a shaft hole portion 10 of the fourth group frame 11.
f and 11f are fitted. The guide shaft 8 has a shaft hole portion 9g of the second group frame 9, a third group frame 10, and a forked portion 10g, 11 of the fourth group frame 11.
g is fitted, and the frames 9, 10 and 11 are slidably supported in a state of being housed inside the inner fixed frame 5.

【００２７】そして、前述したように２，３，４群枠
９，１０，１１に固着されているカムフォロワ９ｃ，１
０ｃ，１１ｃを内固定枠５の後述する開口部５ｃ，５ｄ
を貫通してカム環３のカム溝３ｂ，３ｃ，３ｄに摺動自
在に嵌入させる。そのフォロワ９ｃ，１０ｃ，１１ｃの
逃げ、また、上記ガイド軸７，８と２，３，４群枠９，
１０，１１の軸穴や２又部の逃げのために、上記内固定
枠５には光軸Ｏに沿って上記開口部５ｃ，５ｄが設けら
れているまた、該ＣＣＤホルダ１４は、後固定枠１３の
軸穴１３ｆ，１３ｇで支持されているガイド軸７，８に
反被写体側、即ち、ＣＣＤ側から挿入されて摺動自在に
嵌入される。その嵌入状態では、上記駆動コイル１４ｂ
は、開口部１３ｈから前方に挿通され、前記ヨーク１２
の内周部１２ｂと磁石１６とで囲われる部分に位置す
る。その後、後固定枠１３の後方に後カバ−１５を取り
付け、上記ガイド軸７，８は、該後カバ−１５により、
光軸方向の位置規制がなされた状態になる。Then, as described above, the cam followers 9c, 1 fixed to the second, third, fourth group frames 9, 10, 11 are attached.
0c and 11c are openings 5c and 5d, which will be described later, of the inner fixed frame 5.
To be slidably fitted into the cam grooves 3b, 3c, 3d of the cam ring 3. The escape of the followers 9c, 10c, 11c, and the guide shafts 7, 8 and the frames 2, 3, 4 group 9,
The inner fixing frame 5 is provided with the openings 5c and 5d along the optical axis O in order to allow the shaft holes 10 and 11 to escape, and the CCD holder 14 is rear-fixed. The guide shafts 7 and 8 supported by the shaft holes 13f and 13g of the frame 13 are slidably inserted by being inserted from the non-subject side, that is, the CCD side. In the fitted state, the drive coil 14b is
Is inserted forward through the opening 13h, and the yoke 12
It is located in a portion surrounded by the inner peripheral portion 12b and the magnet 16. After that, the rear cover 15 is attached to the rear of the rear fixed frame 13, and the guide shafts 7 and 8 are fixed by the rear cover 15.
The position is regulated in the optical axis direction.

【００２８】一方、前述したように後固定枠１３の被写
体側、即ち、前方側には前述した４群枠１１が装着され
ており、ガイド軸７側に４群枠１１の光軸方向の長さが
比較的長い軸穴１１ｆを、また、ガイド軸８側に４群枠
１１の光軸方向の長さが比較的短い２又部１１ｇをそれ
ぞれ嵌入している。また、後固定枠１３の軸穴１３ｆ，
１３ｇの配設位置は、前述したようにガイド軸７が挿入
される軸穴１３ｆの方をガイド軸８が挿入される軸穴１
３ｇよりも光軸方向に沿って後方に位置している。On the other hand, as described above, the above-mentioned fourth group frame 11 is mounted on the subject side of the rear fixed frame 13, that is, on the front side, and the length of the fourth group frame 11 in the optical axis direction is on the guide shaft 7 side. Has a relatively long shaft hole 11f, and a bifurcated portion 11g having a relatively short length in the optical axis direction of the fourth group frame 11 is fitted on the guide shaft 8 side. In addition, the shaft hole 13f of the rear fixing frame 13,
As for the disposition position of 13g, as described above, the shaft hole 1f into which the guide shaft 7 is inserted is closer to the shaft hole 13f into which the guide shaft 8 is inserted.
It is located rearward of 3 g along the optical axis direction.

【００２９】上記ＣＣＤホルダ１４のガイド部材として
のガイド軸７，８への取り付け状態では、該ホルダ１４
の光軸方向の長さが保持精度上比較的短くてもよい回り
止め部としての二又部１４ｆを軸穴１３ｆで支持される
ガイド軸７側に、また、スリーブ１４ｋ内に設けられ、
光軸方向の長さが保持精度上比較的長い必要がある軸穴
１４ｇを軸穴１３ｇで支持されるガイド軸８側にそれぞ
れ挿通している。When the CCD holder 14 is attached to the guide shafts 7 and 8 serving as guide members, the holder 14 is held.
The length of the optical axis in the direction of the optical axis in the optical axis direction may be relatively short in terms of holding accuracy.
The shaft hole 14g, which needs to have a relatively long length in the optical axis direction in terms of holding accuracy, is inserted through the guide shaft 8 side supported by the shaft hole 13g.

【００３０】前記ＶＣＭを構成するヨーク１２は、磁性
材料で形成され、その取り付け穴１２ａを通して上記後
固定枠１３の被写体側に取り付け穴１３ｃ，１３ｄにて
固着される。図６は上記ヨーク部まわりの断面図であ
り、図６（Ａ）は光軸と直交する断面図で、図６（Ｂ）
はそのＣ−Ｃ断面図である。本図に示すようにヨーク１
２は、ヨーク内周部１２ｂを有し、該内周部１２ｂに対
向して上下左右に４つの磁石１６が装着されている。そ
れらの磁石１６の幅はヨーク内周部１２ｂの１辺の３／
５程度の寸法とするが、特にこの寸法に限らず、種々の
条件を満足するような適切な寸法を採用してよい。The yoke 12 constituting the VCM is made of a magnetic material, and is fixed to the subject side of the rear fixed frame 13 through mounting holes 12a by mounting holes 13c and 13d. 6 is a cross-sectional view around the yoke portion, FIG. 6A is a cross-sectional view orthogonal to the optical axis, and FIG.
Is a sectional view taken along line CC. As shown in this figure, the yoke 1
2 has a yoke inner peripheral portion 12b, and four magnets 16 are mounted vertically and horizontally so as to face the inner peripheral portion 12b. The width of these magnets 16 is 3 / one side of the yoke inner peripheral portion 12b.
Although the size is about 5, the size is not limited to this size, and an appropriate size that satisfies various conditions may be adopted.

【００３１】上記ＣＣＤホルダ１４には、前記図５等に
示したように後方、即ち、ＣＣＤ側からＬＰＦ（ローパ
スフィルタ）５４とＣＣＤ５５が装着されているが、そ
のＬＰＦ５４装着部の外側の筒部外周には、ＬＰＦ５４
を取り囲むように駆動コイル１４ｂがＣＣＤホルダ１４
のボビン部に巻回されている。As shown in FIG. 5 and the like, an LPF (low-pass filter) 54 and a CCD 55 are mounted on the CCD holder 14 from the rear side, that is, from the CCD side, and a cylindrical portion outside the LPF 54 mounting portion. LPF54 on the outer circumference
The drive coil 14b surrounds the CCD holder 14
It is wound around the bobbin part.

【００３２】また、上記図６（Ａ）のヨーク部まわりの
断面図には、ＣＣＤ側からみたヨーク１２とガイド軸
８，７の相対配設位置関係が示される。ホルダ１４のガ
イド軸８用嵌入軸穴１４ｇ部とガイド軸７支持用の二又
部１４ｆ部とは、上記磁石１６配設位置の隙間に位置
し、ヨーク１２部の光軸Ｏを通る略対角線Ｌｃ上の右下
位置と左上位置にある。従って、ガイド軸８，７を結ぶ
中心線とヨーク内周の対角線Ｌｃとは略一致することに
なる。The cross-sectional view around the yoke portion in FIG. 6A shows the relative arrangement positional relationship between the yoke 12 and the guide shafts 8 and 7 as seen from the CCD side. The guide shaft 8 insertion shaft hole 14g portion of the holder 14 and the guide shaft 7 supporting bifurcated portion 14f portion are located in the gap at the position where the magnet 16 is disposed, and are substantially diagonal lines passing through the optical axis O of the yoke 12 portion. It is located at the lower right position and the upper left position on Lc. Therefore, the center line connecting the guide shafts 8 and 7 and the diagonal line Lc on the inner circumference of the yoke substantially coincide with each other.

【００３３】次に、本実施例におけるＣＣＤ５５の位置
検出手段である進退位置検出部を構成する発光素子６１
とＰＳＤ６２の配設状態について説明する。図７は、Ｃ
ＣＤホルダ１４と進退位置検出部の配設状態を示す斜視
図であり、図８は、上記ＣＣＤホルダ１４と進退位置検
出部まわりをＣＣＤ側から見た図である。ＣＣＤホルダ
１４に一体的に配設されたスリット１４ｉが上記ＰＳＤ
６２に対向した位置に設けられており、更に該スリット
１４ｉの端部にはＬＥＤ６１がＣＣＤホルダ１４に支持
されて配設される。Next, the light emitting element 61 which constitutes the advancing / retreating position detecting portion which is the position detecting means of the CCD 55 in this embodiment.
The arrangement of the PSD 62 and the PSD 62 will be described. FIG. 7 shows C
FIG. 9 is a perspective view showing an arrangement state of a CD holder 14 and an advancing / retreating position detecting portion, and FIG. 8 is a view of the CCD holder 14 and the advancing / retreating position detecting portion viewed from the CCD side. The slit 14i integrally provided in the CCD holder 14 has the above-mentioned PSD.
The LED 61 is provided at a position facing 62, and the LED 61 is supported by the CCD holder 14 at the end of the slit 14i.

【００３４】更に、図９のＣＣＤホルダの縦断面図に示
すように、上記ＣＣＤ５５及び上記ＬＥＤ６１、また、
コイル１４ｂ等にその一端が接続されている電気信号接
続用であるフレキシブル回路基板としてのＦＰＣ５６
は、一旦、Ｕ字状に撓ませた状態で後方に引き出され後
カバー１５で固定される。この時、上記ＦＰＣ５６によ
ってＣＣＤ５５には常に光軸方向に押圧力ＦＦが作用す
ることになり、後方から前方（撮影者側→被写体側）に
常に負荷がかかる。Further, as shown in the longitudinal sectional view of the CCD holder in FIG. 9, the CCD 55, the LED 61, and
FPC 56 as a flexible circuit board for electrical signal connection, one end of which is connected to the coil 14b and the like.
Is once pulled out rearward in a state of being bent in a U shape and fixed by the rear cover 15. At this time, the FPC 56 always applies a pressing force FF to the CCD 55 in the optical axis direction, and a load is always applied from the rear to the front (photographer side → subject side).

【００３５】次に、駆動時にＣＣＤホルダ１４に作用す
るモーメントについて説明する。図１０は、後方から前
方に駆動する時のＣＣＤホルダ１４の作用状態を示す図
であって、前記図６（Ａ）の対角線Ｌｃと直交する方向
からみた作用図である。Next, the moment acting on the CCD holder 14 during driving will be described. FIG. 10 is a view showing an operation state of the CCD holder 14 when it is driven from the rear to the front, and is an operation view as seen from a direction orthogonal to the diagonal line Lc of FIG. 6 (A).

【００３６】いま、可動部、即ち、ＣＣＤホルダ１４と
その搭載部品との加算された重量を可動自重ｍ、ガイド
軸８、７との摺動部の摩擦係数をμとすると、ＣＣＤホ
ルダ１４のスリーブ１４ｋの軸穴１４ｇ、二又部１４ｆ
が受ける可動自重ｍに対する反力Ｒa0，Ｒｕはそれぞ
れ、 Ｒｕ＝（１／２）×ｍ×ｃｏｓ４５゜ ＝（１／（２×２^1/2 ））×ｍ ＝Ｒa0 である。Now, assuming that the movable part, that is, the added weight of the CCD holder 14 and its mounted parts is the movable weight m and the friction coefficient of the sliding part with the guide shafts 8 and 7 is μ, the CCD holder 14 Shaft hole 14g of sleeve 14k, forked portion 14f
The reaction forces Ra0 and Ru with respect to the movable weight m of the vehicle are Ru = (1/2) × m × cos 45 ° = (1 / (2 × 2 ^1/2 )) × m = Ra0, respectively.

【００３７】ここで、ＣＣＤホルダ１４が前方に僅かに
傾いた状態であって、図１０の作用図に示すように軸穴
１４ｇの後方端ｂ点がガイド軸８に接触する寸前の状態
における、軸穴１４ｇとガイド軸８の接触する軸穴前方
端の接触点ａを中心として作用するモーメントを考え
る。駆動推力ＦによるモーメントＦ×ＬF がＣＣＤホル
ダ自重ｍの作用力と支持部の摩擦力等の負荷抵抗による
モーメントとが一致する場合、即ち、ガイド軸７、８の
心間距離をＬｕ、ガイド軸８と駆動推力作用点間距離を
ＬF、軸穴前方端の接触点ａとＣＣＤホルダ１４の可動
体の重心位置Ｐ0 とのガイド軸に沿った距離をＬm1とし
て、 Ｆ×ＬF ＝（１／２^1/2 ）×ｍ×（Ｌm1＋（１／２）×μ×Ｌｕ）…（１） が成立する場合には、ＣＣＤホルダ１４が上記図１０の
ように倒れてしまう直前の状態であって、ガイド軸８と
軸穴１４ｇの後方端のｂ点が接触するか、しないかの臨
界状態にある。Here, in a state in which the CCD holder 14 is slightly tilted forward, and as shown in the operation diagram of FIG. 10, the rear end point b of the shaft hole 14g is about to come into contact with the guide shaft 8, Consider a moment acting around the contact point a at the front end of the shaft hole where the shaft hole 14g and the guide shaft 8 contact each other. When the moment F × LF due to the driving thrust F is equal to the moment due to the load force such as the frictional force of the supporting portion and the acting force of the CCD holder's own weight m, that is, the center distance between the guide shafts 7 and 8 is Lu, the guide shaft is 8 and the driving thrust acting point are LF, and the distance along the guide axis between the contact point a at the front end of the shaft hole and the center of gravity P0 of the movable body of the CCD holder 14 is Lm1, F × LF = (1/2 ^{When 1/2} ) × m × (Lm1 + (1/2) × μ × Lu) (1) holds, the CCD holder 14 is in a state just before falling down as shown in FIG. The guide shaft 8 and the point b at the rear end of the shaft hole 14g are in a critical state of contact or non-contact.

【００３８】従って、後方から前方へ駆動するときの臨
界推力Ｆ01としては、上記（１）式より、 Ｆ01＝（１／２^1/2 ）×ｍ×（Ｌm1＋（１／２）×μ×Ｌｕ）／ＬF …（１ａ） となる。Therefore, as the critical thrust F01 when driving from the rear to the front, from the above formula (1), F01 = (1/2 ^1/2 ) × m × (Lm1 + (1/2) × μ × Lu ) / LF (1a)

【００３９】推力Ｆが一定量、臨界推力Ｆ01以下の場合
は、図１０に示すような姿勢の変化は起こらず、軸穴後
方端ｂ点はシャフトと接触せずに駆動される。その状態
を保つには、上記推力Ｆが、 Ｆ≦Ｆ01 …（２） であることが条件になる。この時の駆動負荷抵抗ｆ1
は、 ｆ1 ＝μ×（Ｒa0＋Ｒｕ） ＝μ×（１／２^1/2 ）×ｍ …（３） となる。When the thrust force F is a constant amount and equal to or less than the critical thrust force F01, the posture does not change as shown in FIG. 10, and the rear end point b of the shaft hole is driven without contacting the shaft. In order to maintain this state, the thrust F must be F ≦ F01 (2). Drive load resistance f1 at this time
Is f1 = μ × (Ra0 + Ru) = μ × (1/2 ^1/2 ) × m (3)

【００４０】一方、上記（２）式を満足しない場合、即
ち、 Ｆ＞Ｆ0 であって、上記図１０の作用図のようにスリーブ軸穴１
４ｇがガイド軸８に上記点ａ，ｂの２点で接触する時に
は、駆動負荷抵抗ｆ2 は、軸穴１４ｇの接触点ａ、ｂで
の反力をＲａ、Ｒｂとし、軸穴の長さＬｓとし、軸穴１
４ｇの径をｄとして、 ｆ2 ＝μ×（Ｒａ＋Ｒｂ） ＝２×μ×Ｒｂ ＝２×μ×（Ｆ×ＬF −（ｍ／２^1/2 ）×Ｌm1 ）／（Ｌｓ−μ×ｄ） ……（４） となる。On the other hand, when the above expression (2) is not satisfied, that is, F> F0, the sleeve shaft hole 1 as shown in the operation diagram of FIG.
When 4g comes into contact with the guide shaft 8 at the two points a and b, the driving load resistance f2 is the reaction force Ra and Rb at the contact points a and b of the shaft hole 14g, and the length Ls of the shaft hole is Ls. And shaft hole 1
F2 = μ × (Ra + Rb) = 2 × μ × Rb = 2 × μ × (F × LF − (m / 2 ^1/2 ) × Lm1) / (Ls−μ × d) ... … (4).

【００４１】上記（４）式に示すように駆動負荷抵抗ｆ
2 は、自重ｍの項以外では、推力Ｆに比例する。なお、
このｆ2 の値には、二又部１４ｆの摩擦力の影響は無視
できるとしている。As shown in the above equation (4), the drive load resistance f
2 is proportional to thrust F except for the term of its own weight m. In addition,
It is stated that the influence of the frictional force of the bifurcated portion 14f can be ignored in this value of f2.

【００４２】一方、ＣＣＤホルダ１４が前方から後方に
駆動される場合について、前記図６（Ａ）の対角線Ｌｃ
と直交する方向からみた作用図の図１１を参照して考え
てみると、まず、姿勢変化を起こさない為の臨界推力Ｆ
02は、軸穴後方端の接触点ｃと重心位置Ｐ0 とのガイド
軸に沿った距離をＬm2として、 Ｆ02＝（１／２^1/2 ）×ｍ×（Ｌm2＋(１／２）μ×Ｌｕ）／ＬF …（５） となる。姿勢変化を起こさない推力Ｆの条件は、 Ｆ≦Ｆ02 となる。On the other hand, in the case where the CCD holder 14 is driven from the front side to the rear side, the diagonal line Lc in FIG.
Considering with reference to FIG. 11 which is an action diagram viewed from a direction orthogonal to the direction, first, the critical thrust F for preventing the posture change from occurring.
02 is F02 = (1/2 ^1/2 ) × m × (Lm2 + (1/2) μ × Lu, where Lm2 is the distance between the contact point c at the rear end of the shaft hole and the center of gravity P0 along the guide axis. ) / LF becomes (5). The condition of thrust F that does not cause posture change is F≤F02.

【００４３】上記（１ａ）、（５）式に示されるよう
に、駆動方向による上記姿勢変化を生じる臨界推力Ｆ01
とＦ02の値が、図１０に示した軸穴の前方接触点ａと重
心位置Ｐ0 との距離Ｌm1と、図１１に示した軸穴後方接
触点ｃと重心位置Ｐ0 との距離Ｌm2との差の影響を受け
ることが解る。As shown in the above equations (1a) and (5), the critical thrust force F01 that causes the above attitude change depending on the driving direction.
And F02 are the difference between the distance Lm1 between the front contact point a of the shaft hole and the center of gravity position P0 shown in FIG. 10 and the distance Lm2 between the rear contact point c of the shaft hole and the center of gravity position P0 shown in FIG. It can be seen that

【００４４】なお、上記の姿勢変化を生じる臨界推力に
往復差はあるが、臨界推力に達する前の状態での負荷、
及び臨界推力を越えた範囲での推力Ｆに対する負荷抵抗
ｆの上昇の比例係数（傾き）は、後方から前方に駆動し
た時と等しくなる。そして、ＶＣＭの発生推力Ｆに対す
る往復駆動時の負荷抵抗ｆの変化は、図１２の特性線図
に示すような特性を示す。Although there is a reciprocal difference in the critical thrust that causes the above attitude change, the load before reaching the critical thrust,
Further, the proportional coefficient (gradient) of the increase of the load resistance f with respect to the thrust F in the range exceeding the critical thrust becomes equal to that when driving from the rear to the front. The change in the load resistance f during reciprocal driving with respect to the generated thrust F of the VCM exhibits the characteristics shown in the characteristic diagram of FIG.

【００４５】上記図１２に示すように前後接触点から重
心までの距離Ｌm1、Ｌm2によって臨界推力より大きい推
力の範囲では、駆動負荷抵抗ｆの往復差Δｆを生じる。
そして、この負荷抵抗の往復差Δｆは、前述の通り、距
離Ｌm1、または、Ｌm2、すなわち、可動部の重心位置Ｐ
0 によって左右されることになる。なお、上記距離Ｌm
1、Ｌm2の和は軸穴長さＬｓとなる。As shown in FIG. 12, in the range of thrust larger than the critical thrust due to the distances Lm1 and Lm2 from the front and rear contact points to the center of gravity, the reciprocal difference Δf of the driving load resistance f is generated.
The round-trip difference Δf in the load resistance is the distance Lm1 or Lm2, that is, the center of gravity P of the movable part, as described above.
It will depend on 0. The above distance Lm
The sum of 1 and Lm2 is the axial hole length Ls.

【００４６】そこで、本実施例の場合は、駆動負荷抵抗
ｆの往復差Δｆと前述図９で説明したＦＰＣ５６による
押圧力ＦＦとが一致するように、即ち、 Δｆ＝ＦＦ …（６） となるように、上記可動部の重心位置の距離Ｌm1、また
は、Ｌm2を設定し、可動体となるＣＣＤホルダ１４、お
よび、該ホルダ１４に固着して取り付けられる各部材の
可動体トータルの重心位置Ｐ0 を定める。上記のように
設定されたＣＣＤホルダ１４を適用することにより、駆
動負荷抵抗ｆの往復差ΔｆをＦＰＣ５６による押圧力Ｆ
Ｆにより打ち消すことができる。Therefore, in the case of the present embodiment, the reciprocal difference Δf of the drive load resistance f and the pressing force FF by the FPC 56 described in FIG. 9 are matched, that is, Δf = FF (6) As described above, the distance Lm1 or Lm2 of the position of the center of gravity of the movable portion is set, and the CCD holder 14 serving as the movable body and the total center of gravity position P0 of the movable body of each member fixedly attached to the holder 14 are set. Establish. By applying the CCD holder 14 set as described above, the reciprocal difference Δf of the driving load resistance f is determined by the pressing force F by the FPC 56.
It can be canceled by F.

【００４７】このように上記ＣＣＤホルダ１４を構成す
ることにより本実施例のものにあっては、駆動に必要な
推力の範囲では、駆動負荷抵抗ｆに往復差がなく、駆動
方向に関係なく、移動量に対して同じ制御状態でのＣＣ
Ｄホルダ１４の駆動が可能となる。By constructing the CCD holder 14 in this way, in the present embodiment, within the range of thrust required for driving, there is no reciprocal difference in the driving load resistance f and regardless of the driving direction. CC in the same control state for moving amount
The D holder 14 can be driven.

【００４８】次に、以上の説明した光学素子保持部材駆
動装置を内蔵する本レンズ鏡筒の駆動動作について説明
する。まず、パワースイッチ（図示せず）がオンになる
と、ステッパ５１が駆動され、カム環３がリセット位置
であるワイド端位置まで回動し、１，２，３，４群枠
２，９，１０，１１をそれぞれワイド端位置まで移動さ
せる。ズーミングを行う場合、上記の状態からステッパ
５１を駆動し、カム環３を回動し、１，２，３，４群枠
２，９，１０，１１をそれぞれズーミングに伴って移動
させる。そして、電磁アクチュエータであるＶＣＭの駆
動コイル１４ｂの電流を制御することによって、ＣＣＤ
ホルダ１４に支持されたＣＣＤ５５を上記ズーミング位
置に対応した合焦位置であるズームトラッキング位置ま
で追従して移動させる。即ち、合焦状態を保つためにズ
ーミング動作に応じてＣＣＤ５５が時時刻刻移動する。
また、フォーカシングを行う場合、ＶＣＭによりＣＣＤ
ホルダ１４を進退駆動し、ＣＣＤ５５を合焦位置まで移
動させる。Next, the driving operation of the present lens barrel incorporating the above-described optical element holding member driving device will be described. First, when a power switch (not shown) is turned on, the stepper 51 is driven, the cam ring 3 is rotated to the wide end position which is the reset position, and the 1, 2, 3, 4 group frames 2, 9, 10 , 11 are respectively moved to the wide end positions. When zooming is performed, the stepper 51 is driven from the above state, the cam ring 3 is rotated, and the 1, 2, 3, and 4 group frames 2, 9, 10, and 11 are moved with zooming. Then, by controlling the current of the drive coil 14b of the VCM which is an electromagnetic actuator, the CCD
The CCD 55 supported by the holder 14 is moved to follow the zoom tracking position which is the focus position corresponding to the zooming position. That is, the CCD 55 moves hourly according to the zooming operation in order to maintain the in-focus state.
Also, when focusing is performed, the CCD is used by the VCM.
The holder 14 is driven back and forth to move the CCD 55 to the in-focus position.

【００４９】以上説明したように本実施例のレンズ鏡筒
によれば、ＣＣＤホルダ１４の可動体の重心位置Ｐ0
を、負荷抵抗ｆの往復差ΔｆがＦＰＣの押圧力ＦＦと等
しくなるような位置に設定することにより、駆動負荷の
往復差がなくスムーズな駆動を行うことができ、更に、
ＶＣＭ制御部自体も簡素化される。即ち、本実施例では
ＦＰＣが常に光軸に沿った方向の力でＣＣＤホルダ１４
を押圧しているため、この押圧力と釣り合う負荷の往復
差を発生する位置に重心を設定する。As described above, according to the lens barrel of this embodiment, the center of gravity P0 of the movable body of the CCD holder 14 is set.
Is set at a position where the round trip difference Δf of the load resistance f is equal to the pressing force FF of the FPC, smooth drive can be performed without the round trip difference of the driving load.
The VCM control unit itself is also simplified. That is, in the present embodiment, the FPC is always operated by the force in the direction along the optical axis.
Since the is being pressed, the center of gravity is set at a position where a back-and-forth difference in load that balances this pressing force is generated.

【００５０】なお、上記実施例においては、光学素子保
持部材としてＣＣＤホルダ１４を適用したが、これに限
らず、電磁アクチュエータによって、進退駆動される撮
影レンズ用ホルダ等であってもよい。Although the CCD holder 14 is used as the optical element holding member in the above embodiment, the present invention is not limited to this, and it may be a photographing lens holder or the like that is driven back and forth by an electromagnetic actuator.

【００５１】次に、上記実施例の光学素子駆動装置を内
蔵するレンズ鏡筒におけるＦＰＣの保持方法の変形例に
ついて説明する。図１３は、本変形例におけるＣＣＤホ
ルダ回りの縦断面図であって、本図に示すようにＣＣＤ
５５に対する電気的インターフェースであるＦＰＣ５６
Ａは、光軸Ｏと略直交する方向に延出して取付けられて
いる。そして、後固定枠１３の開口部１３ｉから外部に
導出され、該開口部１３ｉの近傍で固定される。なお、
その他の構成は、前記第１実施例のものと同一とする。Next, a modification of the method of holding the FPC in the lens barrel incorporating the optical element driving device of the above embodiment will be described. FIG. 13 is a vertical cross-sectional view of the CCD holder and its surroundings according to this modification. As shown in FIG.
FPC56 which is an electrical interface to 55
A is attached so as to extend in a direction substantially orthogonal to the optical axis O. Then, it is led out from the opening 13i of the rear fixing frame 13 and fixed near the opening 13i. In addition,
The other structure is the same as that of the first embodiment.

【００５２】上記ＦＰＣ５６Ａは、装着されるとき撓ま
せた状態とするので、常時、光軸Ｏ中心方向にＣＣＤホ
ルダ１４を押圧する押圧力ＦＦ′が作用することになる
が、光軸Ｏ方向にはその押圧力は作用しないので、駆動
時に押圧力による直接的な負荷抵抗は作用しない。但
し、光軸Ｏ中心への押圧力ＦＦ′により駆動時の摩擦負
荷は増加することにはなるが前実施例で示したように、
光軸Ｏ方向の往復差としては作用しない。Since the FPC 56A is in a bent state when mounted, a pressing force FF 'for pressing the CCD holder 14 toward the center of the optical axis O always acts, but in the direction of the optical axis O. Since the pressing force does not act on, the direct load resistance due to the pressing force does not act during driving. However, although the frictional load at the time of driving increases due to the pressing force FF 'to the center of the optical axis O, as shown in the previous embodiment,
It does not act as a round trip difference in the optical axis O direction.

【００５３】そこで、ＦＰＣ５６Ａの押圧力による駆動
負荷抵抗の往復差が発生しないことから、可動体重心位
置によって生じる駆動負荷抵抗ｆの往復差Δｆを０にし
なければならない。上述のように上記Δｆを０にするた
め、ＣＣＤ１４に支持される可動体重心の位置Ｐ0 を前
記（１ａ）式、（５）式上の臨界推力Ｆ01、Ｆ02を等し
くする位置に設定しなければならない。その条件を満足
させるには、重心位置までの距離Ｌm1とＬm2にＬm1＝Ｌ
m2の関係が成り立つような位置、即ち、ＣＣＤホルダ１
４のスリーブ１４ｋの軸穴１４ｇの中央点を通る垂線上
に可動部の重心位置Ｐ0 が位置するように上記ＣＣＤ１
４を構成にする。Therefore, since the reciprocal difference of the drive load resistance due to the pressing force of the FPC 56A does not occur, the reciprocal difference Δf of the drive load resistance f caused by the movable body weight center position must be set to zero. As described above, in order to set Δf to 0, the position P0 of the movable body center of gravity supported by the CCD 14 must be set to a position where the critical thrusts F01 and F02 in the equations (1a) and (5) are equal. I won't. To satisfy the condition, Lm1 = L in the distances Lm1 and Lm2 to the position of the center of gravity.
Position where the relationship of m2 holds, that is, CCD holder 1
The CCD 1 is arranged so that the center of gravity P0 of the movable portion is located on a perpendicular line passing through the center point of the shaft hole 14g of the sleeve 14k of No. 4
4 is configured.

【００５４】即ち、本実施例においては、ＦＰＣの押圧
力が光軸と直角な方向に作用しているために、負荷の往
復差を生じない。従って、可動重心はスリーブの中央に
設定する。このように構成した本変形例によれば、ＦＰ
Ｃ５６Ａによる往復の負荷抵抗の差も生じることなく、
可動部を含むＣＣＤホルダ１４自体による駆動負荷抵抗
の往復差がなく、スムーズな駆動を行うことができ、更
に、ＶＣＭ制御部自体も簡素化される。That is, in the present embodiment, since the pressing force of the FPC acts in the direction perpendicular to the optical axis, there is no difference in load reciprocation. Therefore, the movable center of gravity is set at the center of the sleeve. According to this modification configured in this way, the FP
There is no difference in load resistance between the two ends due to C56A,
There is no round-trip difference in the driving load resistance due to the CCD holder 14 itself including the movable part, smooth driving can be performed, and the VCM control part itself is also simplified.

【００５５】（付記）以上、説明した実施態様により、
以下の構成に示すボイスコイルモータ駆動装置を提案で
きる。 （１）合焦または変倍を行うための光学素子と、円筒状
のスリーブ部とＵ字状の回転止め部を有する前記光学素
子の保持部材と、前記スリーブ部と回転止め部とで係合
して前記光学素子保持部材を光軸方向に駆動可能に支持
するガイド部材と、前記光学素子保持部材を電磁駆動に
より摺動させるための電磁アクチュエータと、前記光学
素子の位置検出ために前記光学素子保持部材上に搭載さ
れた位置検出用センサと、前記電磁アクチュエータ及び
前記位置検出用センサのレンズ鏡筒本体との電気的接続
を取るためのフレキシブル回路基板とを具備するボイス
コイルモータ駆動装置。(Supplementary Note) According to the embodiment described above,
A voice coil motor drive device having the following configuration can be proposed. (1) Engagement of an optical element for focusing or zooming, a holding member for the optical element having a cylindrical sleeve portion and a U-shaped rotation stopping portion, and the sleeve portion and the rotation stopping portion And a guide member for supporting the optical element holding member so as to be driven in the optical axis direction, an electromagnetic actuator for sliding the optical element holding member by electromagnetic drive, and the optical element for detecting the position of the optical element. A voice coil motor drive device comprising: a position detection sensor mounted on a holding member; and a flexible circuit board for electrically connecting the electromagnetic actuator and the lens barrel main body of the position detection sensor.

【００５６】本ボイスコイルモータ駆動装置において
は、フレキシブル回路基板によって生じる負荷の往復差
を相殺するような方向および量の負荷を発生するよう
に、前記光学素子保持部材とそれと一体的に駆動される
諸部材とを合わせた可動部の重心位置を定める。本ボイ
スコイルモータ駆動装置によれば、駆動負荷の往復差が
なく、スムーズな駆動を行うことができ、更に、ＶＣＭ
制御部自体も簡素化される。In the voice coil motor driving device of the present invention, the optical element holding member and the optical element holding member are integrally driven so as to generate a load having a direction and an amount that cancel the round-trip difference of the load generated by the flexible circuit board. Determine the position of the center of gravity of the movable part, including the various members. According to the voice coil motor driving device of the present invention, there is no round-trip difference in driving load, and smooth driving can be performed.
The control unit itself is also simplified.

【００５７】[0057]

【発明の効果】上述したように本発明の請求項１記載の
光学素子保持部材駆動装置は、電磁アクチュエータによ
り光学素子保持部材を進退駆動する装置であって、電気
的接続用フレキシブル回路基板による駆動時の往復負荷
が相殺され、スムーズに駆動することが可能となり、駆
動抵抗の往復差がないことから電磁アクチュエータの駆
動制御も簡素化される。As described above, the optical element holding member driving device according to claim 1 of the present invention is a device for driving the optical element holding member forward and backward by an electromagnetic actuator, and is driven by a flexible circuit board for electrical connection. The reciprocating load at the time is canceled out, the driving can be performed smoothly, and the driving control of the electromagnetic actuator is simplified because there is no difference in the reciprocating driving resistance.

【００５８】また、本発明の請求項２記載の光学素子保
持部材駆動装置は、上記請求項１記載の光学素子保持部
材駆動装置において、フレキシブル回路基板の負荷が装
置の移動方向と一致したものであって、フレキシブル回
路基板の配置が容易で、しかも、スムーズな駆動を行う
ことができる。The optical element holding member driving device according to claim 2 of the present invention is the optical element holding member driving device according to claim 1, in which the load of the flexible circuit board coincides with the moving direction of the device. Therefore, the flexible circuit board can be easily arranged and smooth driving can be performed.

【００５９】また、本発明の請求項３記載の光学素子保
持部材駆動装置は、電磁アクチュエータにより光学素子
保持部材を進退駆動する装置であって、装置の駆動時の
往復負荷抵抗差がなくなり、スムーズに駆動することが
可能であって、駆動抵抗の往復差がないことから電磁ア
クチュエータの駆動制御も簡素化される。An optical element holding member driving device according to a third aspect of the present invention is a device for driving an optical element holding member forward and backward by an electromagnetic actuator, and there is no difference in reciprocal load resistance when the device is driven, resulting in smooth operation. The driving control of the electromagnetic actuator is simplified because there is no difference in the round trip of the driving resistance.

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

【図１】本発明の一実施例を示す光学素子保持部材駆動
装置を内蔵したレンズ鏡筒の分解斜視図の一部。FIG. 1 is a part of an exploded perspective view of a lens barrel incorporating an optical element holding member driving device according to an embodiment of the present invention.

【図２】上記図１のレンズ鏡筒の分解斜視図の一部。2 is a part of an exploded perspective view of the lens barrel of FIG.

【図３】上記図１のレンズ鏡筒の分解斜視図の一部。FIG. 3 is a part of an exploded perspective view of the lens barrel of FIG.

【図４】上記図１のレンズ鏡筒の分解斜視図の一部。4 is a part of an exploded perspective view of the lens barrel of FIG.

【図５】上記図１のレンズ鏡筒の光軸に沿った縦断面
図。5 is a vertical cross-sectional view taken along the optical axis of the lens barrel of FIG.

【図６】上記図１のレンズ鏡筒の光学素子保持部材駆動
装置のＶＣＭのヨークまわりの断面図であって、図６
（Ａ）は光軸と直交する面の断面図であり、図６（Ｂ）
は光軸に沿った断面図である。6 is a cross-sectional view around the yoke of the VCM of the optical element holding member driving device for the lens barrel of FIG.
6A is a cross-sectional view of a plane orthogonal to the optical axis, and FIG.
FIG. 4 is a sectional view taken along the optical axis.

【図７】上記図１のレンズ鏡筒の光学素子保持部材駆動
装置の位置検出部の斜視図。7 is a perspective view of a position detector of the optical element holding member driving device of the lens barrel of FIG.

【図８】上記図１のレンズ鏡筒の光学素子保持部材駆動
装置の位置検出部をＣＣＤ側からみた図。8 is a view of the position detection unit of the optical element holding member driving device of the lens barrel of FIG. 1 as viewed from the CCD side.

【図９】上記図１のレンズ鏡筒の光学素子保持部材駆動
装置ＣＣＤホルダ周りの縦断面図。9 is a vertical cross-sectional view around an optical element holding member driving device CCD holder of the lens barrel of FIG.

【図１０】上記図１のレンズ鏡筒の光学素子保持部材駆
動装置のＣＣＤホルダ駆動時の作用図であって、該ホル
ダが前方向に駆動されるときの状態を示す。10 is an operation diagram of the optical element holding member driving device of the lens barrel of FIG. 1 when driving a CCD holder, showing a state when the holder is driven in a forward direction.

【図１１】上記図１のレンズ鏡筒の光学素子保持部材駆
動装置のＣＣＤホルダ駆動時の作用図であって、該ホル
ダが後方向に駆動されるときの状態を示す。FIG. 11 is an operation diagram of the optical element holding member driving device for the lens barrel of FIG. 1 when the CCD holder is driven, and shows a state when the holder is driven backward.

【図１２】上記図１のレンズ鏡筒の光学素子保持部材駆
動装置のＣＣＤホルダに作用する推力と駆動負荷抵抗の
関係を示す特性線図。12 is a characteristic diagram showing a relationship between a thrust acting on a CCD holder of the optical element holding member driving device of the lens barrel of FIG. 1 and a driving load resistance.

【図１３】上記図１の実施例の光学素子保持部材駆動装
置のＦＰＣ保持方法の変形例におけるＣＣＤホルダ周り
の縦断面図。13 is a vertical cross-sectional view around a CCD holder in a modification of the FPC holding method of the optical element holding member driving device of the embodiment of FIG.

【符号の説明】[Explanation of symbols]

７ …………………ガイド軸（ガイド部材） ８ …………………ガイド軸（ガイド部材） １４…………………ＣＣＤホルダ（光学素子保持部材） １４ｂ………………コイル（電磁アクチュエータ） １４ｆ………………二又部（回り止め部） １４ｇ………………軸穴（スリーブ部） １４ｋ………………スリーブ（スリーブ部） １６…………………磁石（電磁アクチュエータ） ５４…………………光学フィルタ（光学素子） ５５…………………ＣＣＤ（光学素子） ５６、５６Ａ………ＦＰＣ（フレキシブル回路基板） Ｐ0 …………………重心位置 7 …………………… Guide shaft (guide member) 8 …………………… Guide shaft (guide member) 14 …………………… CCD holder (optical element holding member) 14b …………… … Coil (electromagnetic actuator) 14f …………… Bifurcated part (rotation stop part) 14g ……………… Shaft hole (sleeve part) 14k ……………… Sleeve (sleeve part) 16 ………… ………… Magnet (electromagnetic actuator) 54 ……………… Optical filter (optical element) 55 ……………… CCD (optical element) 56, 56A ……… FPC (flexible circuit board) P0… ………………Position of the center of gravity

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.⁶ 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０３Ｂ 13/34 Ｇ０３Ｂ 3/10 (72)発明者 佐藤 政雄 東京都渋谷区幡ヶ谷２丁目43番２号 オリ ンパス光学工業株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technical indication location G03B 13/34 G03B 3/10 (72) Inventor Masao Sato 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd.

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 スリーブ部と回り止め部を有しこれらが
ガイド部材によりガイドされ光軸に沿って移動可能な光
学素子保持部材と、光学素子保持部材に連結され光学素
子保持部材に外部から負荷を与えるフレキシブル回路基
板と、光学素子保持部材を駆動する電磁アクチュエータ
を具備する光学素子保持部材駆動装置であって、 電磁アクチュエータによる光学素子保持部材の駆動方向
に拘らずスリーブ部にかかる負荷がほぼ一定となるよう
に、光学素子保持部材を含め一体的に移動可能な可動体
の重心位置を定めたことを特徴とする光学素子保持部材
駆動装置。1. An optical element holding member having a sleeve portion and a rotation stop portion, which are guided by a guide member and are movable along the optical axis, and an optical element holding member connected to the optical element holding member and externally loaded on the optical element holding member. An optical element holding member driving device including a flexible circuit board for providing an optical element holding member and an electromagnetic actuator for driving the optical element holding member, wherein the load applied to the sleeve portion is substantially constant regardless of the driving direction of the optical element holding member by the electromagnetic actuator. The optical element holding member driving device is characterized in that the position of the center of gravity of a movable body including the optical element holding member is integrally movable. 【請求項２】 フレキシブル回路基板が光学素子保持部
材にその移動方向に沿った方向の負荷を及ぼすように連
結されている請求項１記載の光学素子保持部材駆動装
置。2. The optical element holding member driving device according to claim 1, wherein the flexible circuit board is connected to the optical element holding member so as to exert a load in a direction along a moving direction thereof. 【請求項３】 スリーブ部と回り止め部を有しこれらが
ガイド部材によりガイドされ光軸に沿って移動可能な光
学素子保持部材と、光学素子保持部材を駆動する電磁ア
クチュエータを具備する光学素子保持部材駆動装置であ
って、 電磁アクチュエータによる光学素子保持部材の駆動方向
に拘らずスリーブ部にかかる負荷がほぼ一定となるよう
に、光学素子保持部材を含め一体的に移動可能な可動体
の重心位置を定めたことを特徴とする光学素子保持部材
駆動装置。3. An optical element holding member comprising an optical element holding member which has a sleeve portion and a rotation stopping portion and which is guided by a guide member and is movable along the optical axis, and an electromagnetic actuator which drives the optical element holding member. In the member driving device, the position of the center of gravity of the movable body including the optical element holding member and the movable body can be integrally moved so that the load applied to the sleeve is almost constant regardless of the driving direction of the optical element holding member by the electromagnetic actuator. An optical element holding member drive device characterized in that