JP3992167B2

JP3992167B2 - Lens barrel

Info

Publication number: JP3992167B2
Application number: JP22947898A
Authority: JP
Inventors: 勝山本
Original assignee: Sigma Inc
Current assignee: Sigma Inc
Priority date: 1998-07-31
Filing date: 1998-07-31
Publication date: 2007-10-17
Anticipated expiration: 2018-07-31
Also published as: JP2000047091A

Description

【０００１】
【発明の属する技術分野】
本発明はシステムカメラ、特に一眼レフカメラの交換レンズの鏡筒に関し、さらに詳しくは手動距離環調整が可能なＡＦ一眼レフカメラのレンズ鏡筒に関する。
【０００２】
【従来の技術】
ＡＦ一眼レフにおいて、ボデー内モータ式及びレンズ内モーター式ＡＦ専用交換レンズの手動距離調整機構では手動によるクラッチ機構を設置し、駆動モーターの連動系と手動連動系を切り換える方法が一般的である。しかし使用時において、切り換え操作の煩わしさや、撮影のタイミングなどから、問題があった。また駆動モータが超音波モータの場合、連動系が結合したまま無理矢理、手で距離環を回した場合、手動力がモータ側に逆伝達し、超音波モータの圧接状態を保っているローターとステータが摺動し、特性を損ねる危険性があった。
【０００３】
【発明が解決しようとする課題】
これらの操作性の不満や危険性を除くには、モータ駆動時にはモータ駆動力が距離調整筒に伝動し、モータによる自動距離調整が可能である一方、手動距離調整筒から手動調整した場合、切り替え操作なしで距離調整が可能であると同時に、手動側からの動力がモータ側に伝わらない構造の動力伝達機構を有するレンズ鏡筒が望まれていた。
【０００４】
【課題を解決するための手段】
本発明は、このような課題を解決するため、モータ駆動によって撮影光学系の移動レンズを光軸方向に移動させて焦点調整を可能にする距離調整筒に対し、手動調整筒から分離した自動調整筒を設け、通常のモータ駆動による焦点調整では自動調整筒と手動調整筒は一体で回動し、距離調整筒を移動することが可能である一方、手動調整筒に手動による操作力が加わった時、その操作の初段で、モータからの連結を分断し、その後は自動調整筒と手動調整筒が一体で距離調整筒を移動できるよう機能するクラッチ機構を該駆動筒、該自動調整筒と手動調整筒の重ね位置に設置して解決を図った。
【０００５】
【発明の実施の形態】
通常の自動焦点動作時、自動調整筒は駆動筒を捕捉していて、駆動筒の回動にあわせて自動調整筒と手動調整筒は一体で回動し、距離調整筒を光軸方向に移動せしめるが、手動調整筒から手動による回動力が加わると、自動調整筒と駆動筒を結合している結合部材を押し除くように作用し、両筒間の拘束を解くことによって駆動筒に対して滑動しながら手動調整筒から自動調整筒を手動回動せしめることが可能となる構造になっている。
【０００６】
【実施例】
以下、図面等を参照して本発明の最も良好な実施形態を説明する。
【０００７】
図１は本発明の鏡筒に設置したクラッチ機構の概略斜視図であり、図２はその動作説明図である。図３は別方式のクラッチ機構の概略斜視図で、図４は本発明の鏡筒断面図で、レンズ内モータ式の実施例を示している。図において同じ部材は同じ符号で示す。図４の鏡筒断面図において、光軸Ｌ０を中心に前部にレンズ群Ｌ１と後部にレンズ群Ｌ２が有り、レンズ群Ｌ２に対してレンズ群Ｌ１を直進移動せしめることにより、焦点調整が可能なレンズ鏡胴の例を示している。
【０００８】
前部のレンズ群Ｌ１は保持枠１に、後部のレンズ群Ｌ２は保持枠２で保持されていて、レンズ群Ｌ１の保持枠１が固定されている距離調整筒５のヘリコイド部５ａと移動筒４のヘリコイド部４ａが噛み合っていて、固定筒３に対して移動筒４と距離調整筒５は一体で直進移動出来るようになっている。また、距離調整筒５の上に自動調整筒６があり、内側直進キー溝６ａに距離調整筒５のキー５ｂがはまっているため、自動調整筒６の回転を距離調整筒５に伝えることができ、移動筒４と距離調整筒５の相対角度の変化により、移動筒４に対する距離調整筒５および、保持枠１のレンズ群Ｌ１の直進位置が変化し、本鏡筒の焦点調整が可能となっている。
【０００９】
さらに自動調整筒６に重なるように嵌合していて、手動操作可能なレンズ鏡筒本体の一番外周位置に手動調整筒７が設置されている。
【００１０】
モータ９からの動力はモータ軸のピニオン９ａから減速歯車列９ｂ、９ｃ、９ｄを通し、ピニオン９ｅは駆動筒８の歯車部８ａと噛み合い、駆動筒８に伝えているが、駆動筒８の先頭部はクラッチ機構１０と接続し、そのクラッチ機構１０は自動調整筒６の後部６ｂと手動調整筒７の後部７ａに設置し、通常は駆動筒８を捕捉していて、モータ９から動力が得られている時は自動調整筒６を回動せしめ、距離調整筒５を移動することにより、自動焦点調整が可能である一方、手動調整筒７に手動による回動力が加わった時、駆動筒８に対して自動調整筒６が滑動し、手動調整筒７と一体で回動でき、距離調整筒５を手動で移動させることが可能となる。
【００１１】
以下駆動筒８と自動調整筒６の後部６ｂ及び手動調整筒７の後部７ａの間に設置するクラッチ機構１０について、実施例としてローラで機能する方式を図１に、カムレバーで機能する方式を図３に示してあるので順次詳細に説明する。
【００１２】
先ず図１に示す例は駆動筒８の左側の先頭部に自動調整筒６の後部６ｂが上から重なるように嵌合し、自動調整筒６の上に更に手動調整筒７が重ね嵌合していて、手動調整筒７の後部７ａに突出部７ｂと７ｃが自動調整筒６の後部６ｂの凹部６ｃと６ｄのほぼ中央に左右若干の移動余裕をもって挿入され、自動調整筒６と手動調整筒７がこの部分で係合している。
【００１３】
自動調整筒６の凹部６ｃ、６ｄ間は円周に沿った穿孔部分６ｅがあり、帯状の橋部６ｆで結ばれていて、この橋部６ｆの内周部には右方向にテーパ部を持つ三角溝６ｇと左方向にテーパ部を持つ三角溝６ｈを有し、外周部にはバネ溝６ｉと６ｊを持っていて、三角溝６ｇ及び６ｈのそれぞれのテーパ部と駆動筒８の外周表面と接して設置するローラ１３及び１４に対してクラッチ板１１、１２が在り、クラッチ板１１は腕部１１ｂと１１ｂ’で自動調整筒６の橋部６ｆを抱えるような格好でローラ１３を保持し、頭部１１ｃは自動調整筒６の橋部６ｆの外周部のバネ溝６ｉに在るバネ１５によって右側に押し、腕部１１ｂと１１ｂ’を通してローラ１３を三角溝６ｇのテーパ部と駆動筒８の外周表面に押接するように作用させ、クラッチ板１１の尾部１１ａは曲げによって自動調整筒６の凹部６ｃに一部挿入する形で手動調整筒７の突出部７ｂの左側面にほぼ接する状態に設置してある。
【００１４】
クラッチ板１２はクラッチ板１１と対称形状で自動調整筒６の橋部６ｆの丁度中央に対して対称位置に設置してあり、クラッチ板１１と同様に橋部６ｆのバネ溝６ｊに在るバネ１６よって頭部１２ｃを左側に押し、腕部１２ｂと１２ｂ’を通してローラ１４を三角溝６ｈのテーパ部と駆動筒８の外周表面に押接するように作用させ、クラッチ板１２の尾部１２ａは曲げによって自動調整筒６の凹部６ｄに一部挿入する形で手動調整筒７の突出部７ｃの右側面にほぼ接する状態に設置してある。
【００１５】
このようクラッチ板１１、１２による左右のクラッチ機構は図１に示すように左右対称に設置されていて、右クラッチ機構は駆動筒８の右回転に対しては自動調整筒６の後部６ｂを捕捉して駆動筒８と自動調整筒６が一体で回動し、駆動筒８の左回転（或いは自動調整筒６の右回転）では自動調整筒６が駆動筒８に対して滑動するように作用し、左クラッチ機構は駆動筒８の左回転に対しては自動調整筒６の後部６ｂを捕捉して駆動筒８と自動調整筒６が一体で回動し、駆動筒８の右回転（或いは自動調整筒６の左回転）では自動調整筒６が駆動筒８に対して滑動するように作用するこれらの左右クラッチ機構を一対として駆動筒８の円周上に複数個設置して円周バランスと動作の確実性を高めるようにしてある。
【００１６】
つぎに、このような構成における本発明の動作について図２の説明図に従って説明すると、通常は（Ａ）の状態にあって、クラッチ板１１のローラ１３とクラッチ板１２のローラ１４はそれぞれのバネ１５及びバネ１６によって自動調整筒６の後部６ｂの橋部６ｆの内周側に在る三角溝６ｇと６ｈのそれぞれのテーパ面と駆動筒８の外周表面とでできるクサビ状間隙に押し込まれ、自動調整筒６の後部６ｂは駆動筒８をしっかり捕捉しているため、モータ９から得られる駆動筒８の左右の回動に対して自動調整筒６が一体で回動し、同時にクラッチ板１１の尾部１１ａは手動調整筒７の後部７ａの突出部７ｂを、クラッチ板１２の尾部１２ａは手動調整筒７の後部７ａの突出部７ｃを押すため手動調整筒７も一緒に回動して、自動焦点調整動作が可能となっている。
【００１７】
今、図２の（Ａ）のような状態から手動調整筒７に手動による左回転力が与えられた場合、図２の（Ｂ）に示すように手動調整筒の左回転で突出部７ｂの左側面からクラッチ板１１の尾部１１ａをバネ１５に逆らって左に押すためクラッチ板１１は僅かに左に移動し、これに応じてローラ１３は自動調整筒６の橋部６ｆの右側三角溝６ｇのテーパ面から僅かに離れて駆動筒８の外周面を転がることができるようになる一方、左クラッチ板１２のローラ１４も自動調整筒６の左移動に対して橋部６ｆの左側三角溝６ｈのテーパ面が離れる方向に作用するため両ローラ共、駆動筒８の外周面を転動させることができ、手動調整筒７と自動調整筒６は一体で駆動筒８の外周面を滑動し、モータ動力側と遮断された形で手動による焦点調整が可能となる。
【００１８】
次に図２（Ｃ）に示すような手動による右回転の場合も同様で、手動調整筒７の右回転で手動調整筒の突出部７ｃの右側面がクラッチ板１２をバネ１６に逆らって右に押すため、ローラ１４は自動調整筒６の橋部６ｆの左側三角溝６ｈのテーパ面から僅かに離れて駆動筒８の外周面を転がることができるようになり、右側のの三角溝６ｇに在るローラ１３はテーパ面から離れる方向であるため、ローラ１４、１３共にが転がることができ、左回転同様に手動調整筒７と自動調整筒６は一体で駆動筒８の外周面を滑動し、手動による焦点調整が可能となる。
【００１９】
以上説明したような効果が他の方法で同様に得られるので、これを図３に従って説明すると、前述のクラッチ機構と同様な機能を持つクラッチユニット１７を自動調整筒６の後部６ｂに設置した構成にするが、駆動筒８の先端部は立ち上がった円盤状のツバ８ｂを形成し、自動調整筒６の端面６ｎと接していて、当該ツバを跨いだ形で、自動調整筒６の後部６ｂの一部平面部６ｍの両脇の取り付け凹部６ｋと６ｌにクラッチユニット１７の支持腕１７ａと１７ｂをネジ２７と２８で取り付けている。
【００２０】
クラッチユニット１７は自動調整筒６の円周上に取り付けるため円弧形状であるが、支持腕１７ａと支持腕１７ｂの間に平面部１７ｃを設けていて、そこには軸２０とそれに嵌合する右レバー２２と軸２１とそれに嵌合する左レバー２３及びバネ掛けピン２６を有し、左右レバー２２、２３にはバネ掛けピン２６との間にバネ２４と２５が掛けられていて右レバー２２の先端部２２ｂと左レバー２３の先端部２３ｂで手動調整筒の突出部７ｅを両方からほぼ接触位置に挟み込むように付勢している。
【００２１】
クラッチユニット１７の右レバー２２は図３に示すように一部カム形状の係止レバー２２ａが在って、バネ２４によって先端部が僅か軸２０に対して右に寄った位置で駆動筒８のツバ８ｂの側面８ｃに押しつけられているため、駆動筒８の左回転では係止レバー２２ａの先端部がツバ８ｂの側面８ｃに食い込む形で駆動筒８の回転を阻止し、右回転では係止レバー２２ａの先端部が浮き上がるよう作用するため、ツバ８ｂの側面８ｃを滑動すると言う機能を持つ。
【００２２】
他方の左レバー２３はこの右レバー２２と対称形状でクラッチユニット１７の中央に対して、対称位置に設置しているため右レバー２２の反対方向の作用をし、駆動筒８の右回転では係止レバー２３ａの先端部がツバ８ｂの側面８ｃに食い込む形で駆動筒８の回転を阻止し、左回転では係止レバー２３ａの先端部が浮き上がるよう作用するため、駆動筒８のツバ８ｂの側面８ｃを滑動すると言う右レバー２２の反対方向の機能を持ている。
【００２３】
このため、通常は自動調整筒６の後部６ｂに設置しているクラッチユニット１７の左右レバー２２、２３によって駆動筒８のツバ８ｂを捕捉しているため、駆動筒８の左右方向回転に対して、自動調整筒６及び手動調整筒７が一体で回動するが、手動調整筒７から右方向の回転手動力が働くと、手動調整筒７の突出部７ｅが右レバー２２の先端部２２ｂをバネ２４に逆らって自動調整筒６の後部６ｂの平面部６ｍの右位置に設置してあるストッパー１８まで押すことになり、この動作によって右レバー２２の係止レバー２２ａの先端が駆動筒８のツバ８ｂの側面８ｃから僅少、浮き上がり、この状態で手動調整筒７を回動を続けると右レバー２２の先端部２２ｂを通して自動調整筒６のストッパー１８を更に右側に押すことになるため、左レバー２３は前述のように駆動筒８に対して滑動する方向（相対的に駆動筒の回転８が左方向回転になるため）であるため、手動調整筒７と自動調整筒６と一体で駆動筒８に関係無く、手動での右方向回動が可能となる。
【００２４】
今度は手動調整筒７から左方向の回転手動力が働いた場合、手動調整筒７の突出部７ｅが左レバー２３の先端部２３ｂをバネ２５に逆らってストッパー１９まで押し、この動作によって左レバー２３の係止レバー２３ａの先端が駆動筒８のツバ８ｂの側面８ｃから同様に僅少、浮き上がるため、更に左方向に回動すると右回動の場合と反対に右レバー２２は駆動筒８のツバ８ｂの側面８ｃに対して滑動する方向であるため、右の場合と同様に手動調整筒７と自動調整筒６と一体で駆動筒８に関係無く手動での左方向回動が可能であることから、手動調整筒７に手動による左右方向の回動操作が働いた場合、自動調整筒６と駆動筒８との結合が解かれ、手動調整筒７から自動調整筒６を左右任意に回動させることができることがわかる。
【００２５】
以上２方式について説明したがいずれも駆動筒８にモータ９の動力が得られたときはモータ９による自動焦点調整ができ、駆動筒８に動力が加わらない静止状態においては手動調整筒７から任意に焦点調整が可能であることは上記述べた通りであるがモータ９による自動焦点調整動作中において、手動調整筒７に手動力が加わった場合、手動調整筒７の回転トルクと駆動筒８トルクの相対トルク差が図１に示す方式ではバネ１５或いはバネ１６の付勢力、図３に示す方式ではバネ２４或いはバネ２５の付勢力を超える時駆動筒８に対して自動調整筒６は滑動するので、駆動筒８の移動動作中でも自動調整筒６の移動を止めたり、位置を変えたりすることが可能であることから本発明の目的の効果か得られると同時に、ＡＦレンズがレンズ内モータ駆動式または、ボデー内モータ駆動式のどちらの方式にも応用可能であること、また駆動モータがＤＣモータ、超音波モータの種類に関係なく、特に超音波モータ使用の場合、手動調整時の逆伝達回転で圧接しているステータとローターのスリップによる特性劣化の事故を防ぐことができる等本発明のメリットは大きい。
【００２６】
【発明の効果】
以上説明したように本発明の構成によれば、ＡＦレンズのマニュアル調整において特別な切り替え手段を設けずに常時調整が可能な安価で、品質の高いＡＦレンズ鏡筒が提供出来る。
【図面の簡単な説明】
【図１】クラッチ機構の概略斜視図である。
【図２】動作説明図である。
【図３】別方式のクラッチ機構の概略斜視図である。
【図４】本発明の鏡筒断面図である。
【符号の説明】
１保持枠
２保持枠
３固定筒
４移動筒
５距離調整筒
６自動調整筒
７手動調整筒
８駆動筒
９モータ
１０クラッチ機構
１１クラッチ板
１２クラッチ板
１３ローラー
１４ローラー
１５バネ
１６バネ
１７クラッチユニット
１８ストッパー
１９ストッパー
２０軸
２１軸
２２右レバー
２３左レバー
２４バネ
２５バネ
２６バネ掛けピン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens barrel of an interchangeable lens of a system camera, particularly a single lens reflex camera, and more particularly to a lens barrel of an AF single lens reflex camera capable of manual distance ring adjustment.
[0002]
[Prior art]
In an AF single-lens reflex camera, a manual clutch mechanism is installed in the manual distance adjustment mechanism of the in-body motor type and the in-lens motor type AF-dedicated interchangeable lens, and a method of switching between the driving motor interlocking system and the manual interlocking system is common. However, there are problems in use due to the troublesome switching operation and the timing of shooting. If the drive motor is an ultrasonic motor, if the interlocking system is connected and the distance ring is turned by hand, the rotor and stator that maintain the pressure contact state of the ultrasonic motor are transmitted manually back to the motor side. There was a risk of sliding and impairing properties.
[0003]
[Problems to be solved by the invention]
To eliminate these dissatisfactions and dangers of operability, the motor driving force is transmitted to the distance adjustment cylinder when the motor is driven, and automatic distance adjustment by the motor is possible. There has been a demand for a lens barrel having a power transmission mechanism that can adjust the distance without operation and at the same time does not transmit power from the manual side to the motor side.
[0004]
[Means for Solving the Problems]
In order to solve such problems, the present invention provides an automatic adjustment separated from a manual adjustment cylinder for a distance adjustment cylinder that enables focus adjustment by moving a moving lens of a photographing optical system in the optical axis direction by a motor drive. In the normal motor-driven focus adjustment, the automatic adjustment cylinder and the manual adjustment cylinder rotate together to move the distance adjustment cylinder, while manual operation force is applied to the manual adjustment cylinder. At the first stage of the operation, the coupling from the motor is cut off, and then the automatic adjustment cylinder and the manual adjustment cylinder are integrated with the drive cylinder, the automatic adjustment cylinder and the manual adjustment cylinder. The problem was solved by installing it in the overlapping position of the adjustment cylinder.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
During normal autofocus operation, the automatic adjustment cylinder captures the drive cylinder, and the automatic adjustment cylinder and manual adjustment cylinder rotate as the drive cylinder rotates, moving the distance adjustment cylinder in the optical axis direction. However, when manual turning force is applied from the manual adjustment cylinder, it acts to push away the coupling member that connects the automatic adjustment cylinder and the drive cylinder, and by releasing the constraint between both cylinders, The structure is such that the automatic adjustment cylinder can be manually rotated from the manual adjustment cylinder while sliding.
[0006]
【Example】
Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.
[0007]
FIG. 1 is a schematic perspective view of a clutch mechanism installed in a lens barrel of the present invention, and FIG. FIG. 3 is a schematic perspective view of another type of clutch mechanism, and FIG. 4 is a cross-sectional view of the lens barrel of the present invention, showing an embodiment of an in-lens motor type. In the drawings, the same members are denoted by the same reference numerals. In the lens barrel sectional view of FIG. 4, there is a lens unit L1 at the front part and a lens unit L2 at the rear part with the optical axis L0 as the center, and focus adjustment is possible by moving the lens unit L1 straight with respect to the lens unit L2. An example of a simple lens barrel is shown.
[0008]
The front lens group L1 is held by the holding frame 1, the rear lens group L2 is held by the holding frame 2, and the helicoid part 5a of the distance adjusting cylinder 5 and the moving cylinder to which the holding frame 1 of the lens group L1 is fixed. The four helicoid portions 4a are engaged with each other, and the movable cylinder 4 and the distance adjusting cylinder 5 can move linearly and integrally with the fixed cylinder 3. Further, since the automatic adjustment cylinder 6 is provided on the distance adjustment cylinder 5 and the key 5b of the distance adjustment cylinder 5 is fitted in the inner straight keyway 6a, the rotation of the automatic adjustment cylinder 6 can be transmitted to the distance adjustment cylinder 5. In addition, due to the change in the relative angle between the moving cylinder 4 and the distance adjusting cylinder 5, the linear adjustment positions of the distance adjusting cylinder 5 and the lens unit L1 of the holding frame 1 with respect to the moving cylinder 4 change, and the focus adjustment of this lens barrel is possible It has become.
[0009]
Further, the manual adjustment cylinder 7 is installed at the outermost position of the lens barrel main body that can be manually operated and is fitted so as to overlap the automatic adjustment cylinder 6.
[0010]
The power from the motor 9 passes from the pinion 9a of the motor shaft through the reduction gear trains 9b, 9c, 9d, and the pinion 9e meshes with the gear portion 8a of the drive cylinder 8 and is transmitted to the drive cylinder 8, but the head of the drive cylinder 8 This part is connected to the clutch mechanism 10, and the clutch mechanism 10 is installed at the rear part 6 b of the automatic adjustment cylinder 6 and the rear part 7 a of the manual adjustment cylinder 7, and normally captures the drive cylinder 8 and obtains power from the motor 9. When the automatic adjustment cylinder 6 is rotated and the distance adjustment cylinder 5 is moved, automatic focus adjustment is possible. On the other hand, when manual rotation is applied to the manual adjustment cylinder 7, the drive cylinder 8 On the other hand, the automatic adjustment cylinder 6 slides and can be rotated integrally with the manual adjustment cylinder 7, so that the distance adjustment cylinder 5 can be moved manually.
[0011]
Hereinafter, with respect to the clutch mechanism 10 installed between the drive cylinder 8, the rear part 6b of the automatic adjustment cylinder 6 and the rear part 7a of the manual adjustment cylinder 7, a system functioning as a roller as an embodiment is shown in FIG. 1, and a system functioning as a cam lever is illustrated. 3 will be described in detail sequentially.
[0012]
First, in the example shown in FIG. 1, the rear adjustment part 6 b of the automatic adjustment cylinder 6 is fitted to the top part on the left side of the drive cylinder 8 from above, and the manual adjustment cylinder 7 is further overlapped on the automatic adjustment cylinder 6. The projecting parts 7b and 7c are inserted into the rear part 7a of the manual adjustment cylinder 7 with a slight left and right movement margin at the center of the recesses 6c and 6d of the rear part 6b of the automatic adjustment cylinder 6, so that the automatic adjustment cylinder 6 and the manual adjustment cylinder 7 is engaged at this portion.
[0013]
Between the concave portions 6c and 6d of the automatic adjustment cylinder 6, there is a perforated portion 6e along the circumference, which is connected by a belt-like bridge portion 6f, and the inner peripheral portion of the bridge portion 6f has a taper portion in the right direction. The triangular groove 6g has a triangular groove 6h having a taper portion in the left direction, and the outer peripheral portion has spring grooves 6i and 6j. The tapered portions of the triangular grooves 6g and 6h and the outer peripheral surface of the drive cylinder 8 There are clutch plates 11 and 12 for the rollers 13 and 14 installed in contact with each other, and the clutch plate 11 holds the roller 13 in such a manner as to hold the bridge portion 6f of the automatic adjustment cylinder 6 with the arm portions 11b and 11b ′. The head 11c is pushed to the right by the spring 15 in the spring groove 6i on the outer peripheral portion of the bridge portion 6f of the automatic adjustment cylinder 6, and the roller 13 is pushed through the arms 11b and 11b 'to the tapered portion of the triangular groove 6g and the drive cylinder 8. The clutch plate 11 is operated so as to be pressed against the outer peripheral surface. Tail 11a is are placed substantially in contact state on the left side surface of the projecting portion 7b of the manual adjustment cylinder 7 in a manner that partially inserted into the recess 6c of automatic adjustment barrel 6 by bending.
[0014]
The clutch plate 12 has a symmetrical shape with the clutch plate 11 and is installed at a symmetrical position with respect to the center of the bridge portion 6f of the automatic adjustment cylinder 6. Like the clutch plate 11, the clutch plate 12 is located in the spring groove 6j of the bridge portion 6f. 16, the head 12c is pushed to the left side, and the roller 14 is caused to act so as to press the taper portion of the triangular groove 6h and the outer peripheral surface of the drive cylinder 8 through the arm portions 12b and 12b ′, and the tail portion 12a of the clutch plate 12 is bent. It is installed in a state where it is substantially in contact with the right side surface of the protruding portion 7c of the manual adjustment cylinder 7 so as to be partially inserted into the recess 6d of the automatic adjustment cylinder 6.
[0015]
The left and right clutch mechanisms by the clutch plates 11 and 12 are installed symmetrically as shown in FIG. 1, and the right clutch mechanism captures the rear portion 6b of the automatic adjustment cylinder 6 with respect to the right rotation of the drive cylinder 8. Then, the drive cylinder 8 and the automatic adjustment cylinder 6 rotate integrally, and the automatic adjustment cylinder 6 slides relative to the drive cylinder 8 when the drive cylinder 8 rotates to the left (or to the right of the automatic adjustment cylinder 6). The left clutch mechanism captures the rear portion 6b of the automatic adjustment cylinder 6 with respect to the left rotation of the drive cylinder 8, and the drive cylinder 8 and the automatic adjustment cylinder 6 rotate together to rotate the drive cylinder 8 clockwise (or In the counterclockwise rotation of the automatic adjustment cylinder 6, a plurality of these left and right clutch mechanisms that act so that the automatic adjustment cylinder 6 slides relative to the drive cylinder 8 are installed on the circumference of the drive cylinder 8 as a pair. And the certainty of operation is improved.
[0016]
Next, the operation of the present invention in such a configuration will be described with reference to the explanatory diagram of FIG. 2. Normally, in the state (A), the roller 13 of the clutch plate 11 and the roller 14 of the clutch plate 12 are respectively springs. 15 and the spring 16 are pushed into the wedge-shaped gap formed by the respective tapered surfaces of the triangular grooves 6g and 6h on the inner peripheral side of the bridge portion 6f of the rear portion 6b of the automatic adjustment cylinder 6 and the outer peripheral surface of the drive cylinder 8, Since the rear portion 6b of the automatic adjustment cylinder 6 firmly captures the drive cylinder 8, the automatic adjustment cylinder 6 rotates integrally with the left and right rotation of the drive cylinder 8 obtained from the motor 9, and at the same time the clutch plate 11 The tail portion 11a of the manual adjustment cylinder 7 pushes the projection 7b of the rear portion 7a, and the tail portion 12a of the clutch plate 12 pushes the projection 7c of the rear portion 7a of the manual adjustment barrel 7 so that the manual adjustment barrel 7 also rotates together. Automatic focus adjustment It has become possible.
[0017]
Now, when a manual left turning force is applied to the manual adjustment cylinder 7 from the state as shown in FIG. 2A, as shown in FIG. The clutch plate 11 moves slightly to the left to push the tail portion 11a of the clutch plate 11 against the spring 15 from the left side, and accordingly the roller 13 moves to the right triangular groove 6g of the bridge portion 6f of the automatic adjustment cylinder 6. The roller 14 of the left clutch plate 12 can also roll on the left triangular groove 6h of the bridge 6f with respect to the left movement of the automatic adjustment cylinder 6, while being able to roll on the outer peripheral surface of the drive cylinder 8 slightly away from the taper surface. Both of the rollers can roll the outer peripheral surface of the drive cylinder 8, and the manual adjustment cylinder 7 and the automatic adjustment cylinder 6 slide together on the outer peripheral surface of the drive cylinder 8, Manual focus adjustment is possible in the form of being cut off from the motor power side. .
[0018]
Next, the same applies to the case of manual clockwise rotation as shown in FIG. 2C. When the manual adjustment cylinder 7 rotates to the right, the right side surface of the protrusion 7c of the manual adjustment cylinder moves the clutch plate 12 against the spring 16 to the right. Therefore, the roller 14 can roll slightly on the outer peripheral surface of the drive cylinder 8 slightly away from the taper surface of the left triangular groove 6h of the bridge portion 6f of the automatic adjustment cylinder 6, and the roller 14 can be moved to the right triangular groove 6g. Since the existing roller 13 is in a direction away from the tapered surface, both the rollers 14 and 13 can roll. Like the left rotation, the manual adjustment cylinder 7 and the automatic adjustment cylinder 6 integrally slide on the outer peripheral surface of the drive cylinder 8. Manual focus adjustment is possible.
[0019]
Since the effects as described above can be similarly obtained by other methods, this will be described with reference to FIG. 3. A configuration in which the clutch unit 17 having the same function as the above-described clutch mechanism is installed in the rear portion 6 b of the automatic adjustment cylinder 6. However, the front end portion of the drive cylinder 8 forms a raised disc-shaped flange 8b that is in contact with the end surface 6n of the automatic adjustment cylinder 6 and straddles the flange, so that the rear portion 6b of the automatic adjustment cylinder 6 is formed. The support arms 17a and 17b of the clutch unit 17 are attached with screws 27 and 28 to the mounting recesses 6k and 6l on both sides of the partial flat portion 6m.
[0020]
The clutch unit 17 has an arc shape so as to be mounted on the circumference of the automatic adjustment cylinder 6. A flat portion 17c is provided between the support arm 17a and the support arm 17b. The lever 22 and the shaft 21 have a left lever 23 and a spring hook pin 26 fitted thereto, and springs 24 and 25 are hung between the left and right levers 22 and 23 between the spring hook pin 26 and the right lever 22. The front end portion 22b and the front end portion 23b of the left lever 23 urge the projecting portion 7e of the manual adjustment cylinder so as to be sandwiched between the both at almost the contact position.
[0021]
As shown in FIG. 3, the right lever 22 of the clutch unit 17 has a partly cam-shaped locking lever 22a, and the spring cylinder 24 moves the tip of the drive cylinder 8 to the right with respect to the shaft 20 slightly. Since it is pressed against the side surface 8c of the flange 8b, when the drive cylinder 8 rotates to the left, the tip of the locking lever 22a bites into the side surface 8c of the flange 8b to prevent the drive cylinder 8 from rotating. Since it acts so that the front-end | tip part of the lever 22a floats, it has the function of sliding the side surface 8c of the collar 8b.
[0022]
The other left lever 23 is symmetrical with the right lever 22 and is located at a symmetrical position with respect to the center of the clutch unit 17, and thus acts in the opposite direction of the right lever 22. Since the tip of the stop lever 23a bites into the side surface 8c of the collar 8b, the rotation of the drive cylinder 8 is prevented, and in the left rotation, the tip of the latch lever 23a acts so as to be lifted. It has a function in the opposite direction of the right lever 22 to slide 8c.
[0023]
For this reason, since the flange 8b of the drive cylinder 8 is normally captured by the left and right levers 22 and 23 of the clutch unit 17 installed at the rear portion 6b of the automatic adjustment cylinder 6, the rotation of the drive cylinder 8 in the horizontal direction is prevented. The automatic adjustment cylinder 6 and the manual adjustment cylinder 7 rotate together. However, when a rotating manual force in the right direction is applied from the manual adjustment cylinder 7, the protruding portion 7 e of the manual adjustment cylinder 7 moves the tip 22 b of the right lever 22. The end of the locking lever 22a of the right lever 22 is pushed to the stopper 18 which is installed at the right position of the flat portion 6m of the rear portion 6b of the automatic adjustment cylinder 6 against the spring 24. If the manual adjustment cylinder 7 continues to rotate in this state, the stopper 18 of the automatic adjustment cylinder 6 will be pushed further to the right through the tip 22b of the right lever 22, so -23 is the direction of sliding with respect to the drive cylinder 8 as described above (because the rotation 8 of the drive cylinder turns to the left), the manual adjustment cylinder 7 and the automatic adjustment cylinder 6 are driven integrally. Regardless of the cylinder 8, it is possible to turn rightward manually.
[0024]
This time, when a leftward rotating manual force is applied from the manual adjustment cylinder 7, the protrusion 7 e of the manual adjustment cylinder 7 pushes the tip 23 b of the left lever 23 against the spring 25 to the stopper 19, and this operation causes the left lever 23, the tip of the locking lever 23a is slightly lifted from the side surface 8c of the flange 8b of the drive cylinder 8, so that if the lever is further rotated leftward, the right lever 22 is opposite to the flange of the drive cylinder 8. Since it is the direction of sliding with respect to the side surface 8c of 8b, it is possible to manually rotate leftward regardless of the drive cylinder 8 integrally with the manual adjustment cylinder 7 and the automatic adjustment cylinder 6 as in the case of the right. Thus, when a manual left / right rotation operation is applied to the manual adjustment cylinder 7, the automatic adjustment cylinder 6 and the drive cylinder 8 are uncoupled, and the automatic adjustment cylinder 6 is arbitrarily rotated right and left from the manual adjustment cylinder 7. You can see that
[0025]
Although the two methods have been described above, in any case, when the power of the motor 9 is obtained in the drive cylinder 8, automatic focusing can be performed by the motor 9, and in the stationary state where no power is applied to the drive cylinder 8, the manual adjustment cylinder 7 can be arbitrarily set. The focus adjustment is possible as described above. However, when a manual force is applied to the manual adjustment cylinder 7 during the automatic focus adjustment operation by the motor 9, the rotational torque of the manual adjustment cylinder 7 and the torque of the drive cylinder 8 are applied. When the relative torque difference exceeds the urging force of the spring 15 or 16 in the method shown in FIG. 1, and the urging force of the spring 24 or 25 in the method shown in FIG. Therefore, since the movement of the automatic adjustment cylinder 6 can be stopped or the position can be changed during the movement operation of the drive cylinder 8, the effect of the object of the present invention can be obtained, and at the same time, the AF lens can It can be applied to both the motor drive type and the motor drive type in the body, and regardless of the type of DC motor or ultrasonic motor, especially when using an ultrasonic motor, manual adjustment The merit of the present invention is great, for example, it is possible to prevent an accident of characteristic deterioration due to slippage between the stator and the rotor that are in pressure contact by reverse transmission rotation.
[0026]
【The invention's effect】
As described above, according to the configuration of the present invention, it is possible to provide an inexpensive and high-quality AF lens barrel that can be always adjusted without providing any special switching means in manual adjustment of the AF lens.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a clutch mechanism.
FIG. 2 is an operation explanatory diagram.
FIG. 3 is a schematic perspective view of another type of clutch mechanism.
FIG. 4 is a cross-sectional view of the lens barrel of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Holding frame 2 Holding frame 3 Fixed cylinder 4 Moving cylinder 5 Distance adjustment cylinder 6 Automatic adjustment cylinder 7 Manual adjustment cylinder 8 Drive cylinder 9 Motor 10 Clutch mechanism 11 Clutch plate 12 Clutch plate 13 Roller 14 Roller 15 Spring 16 Spring 17 Clutch unit 18 Stopper 19 Stopper 20 Shaft 21 Shaft 22 Right lever 23 Left lever 24 Spring 25 Spring 26 Spring hook pin

Claims

撮影光学系の少なくとも一部の移動レンズを光軸方向に移動させて焦点調整を可能にする距離調整筒に対して、モータに連結する駆動筒の回転駆動によって光軸を中心とする円周方向回転で前記距離調整筒を光軸方向に移動させる自動調整筒と手動回転で前記距離調整筒を光軸方向に移動させる手動調整筒を有するレンズ鏡筒において、通常は前記駆動筒と前記自動調整筒並びに手動調整筒が結続状態にあり、モータ駆動時には当該自動調整筒と当該手動調整筒の一体回動によって、前記距離調整筒の移動が可能で、前記手動調整筒に手動による操作力が作用した時、前記駆動筒に接続する前記自動調整筒を滑動せしめることにより連結を解き、手動による前記距離調整の移動調整が可能となるクラッチ機構を前記駆動筒と前記自動調整筒並びに手動調整筒間に設置したことを特徴とするレンズ鏡筒。For a distance adjustment cylinder that enables focus adjustment by moving at least a part of the moving lens of the photographic optical system in the optical axis direction, the circumferential direction centered on the optical axis by rotating the drive cylinder connected to the motor in the lens barrel having a manual adjustment barrel to move along the optical axis the distance adjusting cylinder having said distance adjusting cylinder automatic adjustment cylinder and manual rotation for moving the optical axis direction by the rotation, usually the automatic adjustment and the drive cylinder The cylinder and the manual adjustment cylinder are in a connected state, and when the motor is driven, the distance adjustment cylinder can be moved by the integral rotation of the automatic adjustment cylinder and the manual adjustment cylinder, and a manual operation force is applied to the manual adjustment cylinder. when applied, the solved connection by allowed to slide automatic adjustment cylinder, manual by the distance moved and adjusted can become a clutch mechanism and the drive cylinder the automatic adjustment barrel moderate adjustments to be connected to the drive cylinder A lens barrel, characterized in that installed between the manual adjustment barrel to.

前記自動調整筒は右方向回転で結合し、その反対方向回転で滑動するものと、左方向回転で結合し、その反対方向回転で滑動するものとの一方向クラッチの一対によって前記駆動筒の結合状態を保ち、前記手動調整筒の手動による回動操作の方向が前記駆動筒に対する前記自動調整筒の結合部材を押しのけて駆動筒と自動調整筒との結合を解く方向に作用するように構成したクラッチ機構を設置したことを特徴とする請求項１記載のレンズ鏡筒。The self-adjusting cylinder is coupled by rotation in the right direction , and the drive cylinder is coupled by a pair of one-way clutches that are coupled by rotation in the opposite direction and those that are coupled in rotation in the left direction and are slid by rotation in the opposite direction. maintaining the state, the direction of the rotational operation manual of the manual adjustment barrel and configured to act in the direction to solve the binding of said displacement the coupling member of the automatic adjustment barrel drive cylinder and automatic adjustment cylinder with respect to the drive cylinder The lens barrel according to claim 1, wherein a clutch mechanism is provided.