JP2001290190A - Variable diaphragm device for zoom lens - Google Patents
Variable diaphragm device for zoom lensInfo
- Publication number
- JP2001290190A JP2001290190A JP2000108380A JP2000108380A JP2001290190A JP 2001290190 A JP2001290190 A JP 2001290190A JP 2000108380 A JP2000108380 A JP 2000108380A JP 2000108380 A JP2000108380 A JP 2000108380A JP 2001290190 A JP2001290190 A JP 2001290190A
- Authority
- JP
- Japan
- Prior art keywords
- aperture
- blade
- variable
- zoom lens
- blade holding
- 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.)
- Pending
Links
Landscapes
- Lens Barrels (AREA)
- Diaphragms For Cameras (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、ズーミングによ
り開放口径が変化するズームレンズを簡単な機構で高精
度に絞り込むズームレンズの可変絞り装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable stop device for a zoom lens, which stops a zoom lens whose opening diameter changes due to zooming with high accuracy by a simple mechanism.
【０００２】[0002]
【従来の技術】一般に、一眼レフカメラの自動絞り装置
においては、常時開放状態に保持されている絞り羽根
を、カメラ本体側のレリーズ操作に関連して作動する絞
り込みレバーにより所要の絞り値まで絞り込んだ後、シ
ャッタを作動させて露出し、シャッタ作動終了後絞り込
みレバーを復帰させて絞り羽根を開閉させるようにして
いる。2. Description of the Related Art In general, in an automatic aperture device of a single-lens reflex camera, aperture blades which are always kept open are reduced to a required aperture value by an aperture lever which operates in connection with a release operation of a camera body. After that, the shutter is operated to expose, and after the shutter operation is completed, the aperture stop lever is returned to open and close the aperture blade.
【０００３】図４は従来の一眼レフカメラの自動絞り装
置の一例を示す分解斜視図である。複数の絞り羽根（図
ではその１枚のみを示す）３３は、支持ピン３３ａを固
定の羽根支持部材３１の軸孔３１ａに軸支され、駆動ピ
ン３３ｂを回動自在な羽根駆動部材３２のカム溝３２ｂ
に緩挿され、羽根駆動部材３２の羽根駆動ばね３４によ
る反時計方向の回転により絞り羽根３３が絞り込まれ
る。FIG. 4 is an exploded perspective view showing an example of a conventional automatic aperture device of a single-lens reflex camera. A plurality of aperture blades (only one of them is shown in the drawing) 33 is supported by a shaft hole 31a of a fixed blade support member 31 for fixing a support pin 33a, and a cam of a rotatable blade drive member 32 for driving a pin 33b. Groove 32b
The aperture blade 33 is narrowed down by the counterclockwise rotation of the blade drive member 32 by the blade drive spring 34.
【０００４】このときの絞り込み量は、絞り設定リング
３５に連動して回転するプリセットカム板３６とベルク
ランク３７とにより設定される。羽根駆動部材３２が羽
根駆動ばね３４の付勢力により反時計方向に回動し、そ
の突起３２ａがピン３７ａに当接すると、ベルクランク
３７が軸３７ｂを支点として反時計方向に回動してその
位置決めピン３７ｃがプリセットカム板３６のカム面３
６ａに当接し、羽根駆動部材３２の回転が停止して絞り
羽根３３が所要の絞り値まで絞り込まれる。At this time, the aperture amount is set by a preset cam plate 36 and a bell crank 37 which rotate in conjunction with an aperture setting ring 35. When the blade drive member 32 rotates counterclockwise by the urging force of the blade drive spring 34 and the projection 32a contacts the pin 37a, the bell crank 37 rotates counterclockwise about the shaft 37b as a fulcrum. The positioning pin 37c is the cam surface 3 of the preset cam plate 36.
6a, the rotation of the blade drive member 32 is stopped, and the aperture blade 33 is stopped down to a required aperture value.
【０００５】羽根駆動部材３２の連結ピン３２ｃは軸３
８ａに枢着された中間レバー３８の段部３８ｂに係合し
ており、羽根開きばね３９の付勢力により常時は羽根駆
動ばね３４の付勢力に抗して羽根駆動部材３２を時計方
向に駆動して絞り羽根３３を図４に示す絞り開放状態に
保持している。The connecting pin 32c of the blade driving member 32 is
The blade drive member 32 is engaged with the stepped portion 38b of the intermediate lever 38 pivotally attached to the blade 8a, and normally drives the blade drive member 32 clockwise against the biasing force of the blade drive spring 34 by the biasing force of the blade opening spring 39. The aperture blade 33 is held in the aperture open state shown in FIG.
【０００６】この状態からカメラ本体側の絞り込みレバ
ー４１がレリーズ操作に関連して矢示Ａ方向に押動する
と、レンズ側の回転リング４０が反時計方向に回動し、
その連接部４０ａが連動ピン３８ｃを介して中間レバー
３８を羽根開きばね３９の付勢力に抗して左旋させる。
これにより、羽根駆動部材３２が羽根駆動ばね３４の付
勢力により反時計方向に回転し、絞り羽根３３が絞り設
定リング３５で設定された絞り値まで絞り込まれる。In this state, when the aperture lever 41 on the camera body is pushed in the direction of arrow A in relation to the release operation, the rotating ring 40 on the lens rotates counterclockwise,
The connecting portion 40a rotates the intermediate lever 38 counterclockwise against the urging force of the blade opening spring 39 via the interlocking pin 38c.
Thus, the blade drive member 32 rotates counterclockwise by the urging force of the blade drive spring 34, and the aperture blade 33 is stopped down to the aperture value set by the aperture setting ring 35.
【０００７】カメラ本体側のシャッタ作動が完了して絞
り込みレバー４１が図示の位置に復帰すると、羽根開き
ばね３９の付勢力により中間レバー３８が連結ピン３２
ｃを介して羽根駆動部材３２を羽根駆動ばね３４の付勢
力に抗して時計方向に復帰させ、絞り羽根３３が再び全
開状態となる。When the shutter operation on the camera body side is completed and the aperture-down lever 41 returns to the position shown in the figure, the intermediate lever 38 is moved by the urging force of the blade opening spring 39 to connect the connecting pin 32.
The blade driving member 32 is returned in the clockwise direction against the urging force of the blade driving spring 34 via c, and the diaphragm blade 33 is fully opened again.
【０００８】なお、上記の構成においては、絞り羽根３
３の支持ピン３３ａを羽根支持部材３１の軸孔３１ａに
軸支し、駆動ピン３３ｂを羽根駆動部材３２のカム溝３
２ｂに緩挿するようにしたが、これを逆にして絞り羽根
の支持ピンを羽根駆動部材の軸孔に枢支し、駆動ピンを
羽根支持部材のカム溝に緩挿するようにしても同様の作
用を得ることができる。In the above configuration, the aperture blade 3
3 is supported by the shaft hole 31a of the blade support member 31, and the drive pin 33b is connected to the cam groove 3 of the blade drive member 32.
2b, the support pin of the diaphragm blade is pivotally supported by the shaft hole of the blade drive member, and the drive pin is loosely inserted into the cam groove of the blade support member. Can be obtained.
【０００９】以上は単焦点レンズに対応した絞り装置で
あるが、開放絞り値一定のズームレンズの場合には、ズ
ーミングに伴って絞り口径を変化させる必要がある。そ
のため、従来のズームレンズにあっては、ズーミングに
より光軸方向に変位する中間レバー３８の連動ピン３８
ｃを、図５に示すように光軸Ｘ方向から所要角度θ°だ
け傾斜させることにより、各焦点距離における羽根駆動
部材３２の回転角を可変にしてズーミングに伴った絞り
口径を変化させるようにしていた。The above is a description of an aperture device corresponding to a single focus lens. However, in the case of a zoom lens having a constant open aperture value, it is necessary to change the aperture diameter with zooming. Therefore, in the conventional zoom lens, the interlocking pin 38 of the intermediate lever 38 displaced in the optical axis direction by zooming.
By inclining c by a required angle θ ° from the optical axis X direction as shown in FIG. 5, the rotation angle of the blade drive member 32 at each focal length is made variable to change the aperture diameter accompanying zooming. I was
【００１０】[0010]
【発明が解決しようとする課題】しかしながら、このよ
うな従来のズームレンズの可変絞り装置にあっては、中
間レバーの連動ピンの光軸に対する傾斜角を利用して各
焦点距離位置での絞り口径を調整していたので、レンズ
の最終組付け段階での絞り口径の微調整がきわめて困難
であるばかりでなく、耐久性にも乏しく経年変化も著し
いという問題点があった。However, in such a conventional variable aperture device of a zoom lens, the aperture diameter at each focal length position is determined by utilizing the inclination angle of the interlocking pin of the intermediate lever with respect to the optical axis. Therefore, not only is it extremely difficult to finely adjust the aperture at the final assembly stage of the lens, but also the durability is poor and the aging is remarkable.
【００１１】一方、近年のカメラの電子化に伴い、カメ
ラ本体側の絞り込みレバーとレンズ鏡筒側の絞り装置と
の機械的連結に代えて、電子接点による電気的連結と
し、レンズ鏡筒側の羽根駆動部材を例えばステッピング
モータ等により回転駆動するようにして、そのステッピ
ングモータの回転ステップ量をカメラ本体側から制御す
るようにしたものが現れている。On the other hand, with the recent digitization of cameras, instead of mechanical connection between the stop lever on the camera body side and the stop device on the lens barrel side, electrical connection by electronic contacts is used. In some cases, a blade driving member is driven to rotate by a stepping motor or the like, and the amount of rotation of the stepping motor is controlled from the camera body.
【００１２】このような構成によれば、カメラ本体側と
レンズ鏡筒側との複雑な機械的連動機構を設けることな
く、且つ高応答性を阻害するフィードバック制御を必要
とすることもなく、簡単な構成できわめて高精度の絞り
装置を実現することが可能になる。この発明は上記の点
に鑑みてなされたものであり、カメラ本体側とレンズ鏡
筒側との機械的連動を廃し、単焦点レンズの絞り装置を
変更することなくズーミングに伴なう絞り口径の変化を
正確に補正し得るズームレンズの可変絞り装置を提供す
ることを目的とする。According to such a configuration, there is no need to provide a complicated mechanical interlocking mechanism between the camera body side and the lens barrel side, and there is no need for feedback control that impairs high responsiveness. With such a configuration, it is possible to realize an extremely accurate diaphragm device. The present invention has been made in view of the above points, eliminates the mechanical interlock between the camera body side and the lens barrel side, and reduces the aperture diameter accompanying zooming without changing the aperture device of the single focus lens. It is an object of the present invention to provide a variable stop device for a zoom lens capable of accurately correcting a change.
【００１３】[0013]
【課題を解決するための手段】この発明は上記の目的を
達成するため、複数の絞り羽根を表裏両面から挾持して
それぞれ１本ずつのピンを保持する第１の羽根保持部材
及び第２の羽根保持部材のいずれか一方を所定角度回動
させることにより、上記絞り羽根を所定絞り量絞り込む
等角度絞り機構を備えた絞り装置が、ズーミングにより
光軸方向に移動する開放絞り値不変のズームレンズの可
変絞り装置において、上記第１，第２の羽根保持部材の
他方をズーミングに対応して回動させる開放口径可変手
段を設けたズームレンズの可変絞り装置を提供するもの
である。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a first blade holding member and a second blade holding a plurality of aperture blades from both front and back surfaces to hold one pin each. By rotating one of the blade holding members by a predetermined angle, an aperture device provided with an equal-angle aperture mechanism for narrowing the aperture blade by a predetermined aperture amount is moved to the optical axis direction by zooming. The present invention provides a variable aperture device of a zoom lens provided with an open aperture variable means for rotating the other of the first and second blade holding members in accordance with zooming.
【００１４】そして、上記のズームレンズの可変絞り装
置において、第１，第２の羽根保持部材の一方が、ステ
ッピングモータにより回転駆動されるようにするのがよ
く、開放口径可変手段が、第１，第２の羽根保持部材の
一方に設けた従動軸と、レンズ鏡筒固定部に形成され上
記従動軸を案内するカム溝とからなるようにするのが好
ましい。In the above-described variable aperture device for a zoom lens, one of the first and second blade holding members is preferably driven to rotate by a stepping motor. , A driven shaft provided on one of the second blade holding members, and a cam groove formed in the lens barrel fixing portion for guiding the driven shaft.
【００１５】[0015]
【発明の実施の形態】以下、この発明の実施形態を図面
に基づいて具体的に説明する。図１は、この発明を実施
したズームレンズの光軸に関して上半部のみを示す縦断
面図、図２は、その内筒に形成したカム溝の形状を示す
説明図、図３は、その可変絞り装置を示す正面図であ
り、図１においては必ずしも同一平面上にない部分も同
一断面として表しており、本願の要旨に関連のない周知
の合焦機構等についてはその説明を省略する。Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing only the upper half of an optical axis of a zoom lens embodying the present invention, FIG. 2 is an explanatory view showing the shape of a cam groove formed in an inner cylinder thereof, and FIG. FIG. 2 is a front view showing the diaphragm device. In FIG. 1, portions that are not necessarily on the same plane are also shown as the same cross section, and descriptions of well-known focusing mechanisms and the like not related to the gist of the present application are omitted.
【００１６】このズームレンズは、図１に示すように、
被写体側（図で左方側）から順に、第１の保持枠１に保
持された合焦用の第１レンズ群Ｌ１、前群Ｌ２ａ及び後
群Ｌ２ｂからなり第２の保持枠２に保持された変倍用の
第２レンズ群Ｌ２、第３の保持枠３に保持された結像用
の第３レンズ群Ｌ３からなる。なお、これらの各レンズ
群は、図面を簡略化するためそれぞれブロックとして示
してある。This zoom lens, as shown in FIG.
The first lens group L1, the front group L2a, and the rear group L2b for focusing held by the first holding frame 1 are sequentially held from the subject side (left side in the figure) and held by the second holding frame 2. A second lens unit L2 for zooming, and a third lens unit L3 for imaging held by the third holding frame 3. Each of these lens groups is shown as a block to simplify the drawing.
【００１７】第１，第２，第３レンズ群Ｌ１，Ｌ２，Ｌ
３を内蔵したレンズ鏡筒１０は、後端部にレンズマウン
ト１１ａ及び複数の電子接点１１ｂを一体に設けた固定
の外筒１１と、その内側に固設した内筒１２とを有して
いる。外筒１１の外周部には合焦操作環１３及び変倍操
作環１４をそれぞれ所定角度回転可能に装着し、内筒１
２の外周部には合焦用の固定ヘリコイド筒１５を介して
変倍連動枠１６を回転自在に設け、内筒１２の内周部に
は第２の保持枠２と一体の移動枠１７を光軸Ｘ方向に摺
動可能に装着してある。The first, second, and third lens units L1, L2, L
The lens barrel 10 with the built-in 3 has a fixed outer cylinder 11 integrally provided with a lens mount 11a and a plurality of electronic contacts 11b at the rear end, and an inner cylinder 12 fixed inside the outer cylinder 11. . A focusing operation ring 13 and a variable power operation ring 14 are mounted on the outer periphery of the outer cylinder 11 so as to be rotatable by a predetermined angle.
A variable magnification interlocking frame 16 is rotatably provided on an outer peripheral portion of the inner cylinder 12 via a fixed helicoid cylinder 15 for focusing, and a movable frame 17 integrated with the second holding frame 2 is provided on an inner peripheral portion of the inner cylinder 12. It is slidably mounted in the optical axis X direction.
【００１８】変倍連動枠１６に植設した連結ピン１８を
外筒１１の円周溝１１ｃを挿通して変倍操作環１４に連
結し、移動枠１７に軸１９ａとコロ１９ｂとからなるコ
ロ軸１９を設け、このコロ軸１９を固定ヘリコイド筒１
５の光軸Ｘ方向の長孔１５ａを挿通して変倍連動枠１６
に形成したカム溝１６ａに嵌合させることにより、変倍
操作環１４を回転することにより移動枠１７が光軸Ｘ方
向に移動し得るようにする。The connecting pin 18 implanted in the variable-magnification interlocking frame 16 is connected to the variable-magnification operating ring 14 by passing through the circumferential groove 11c of the outer cylinder 11, and the moving frame 17 has a roller comprising a shaft 19a and a roller 19b. A shaft 19 is provided, and the roller shaft 19 is fixed to the fixed helicoid cylinder 1.
5 through the elongated hole 15a in the optical axis X direction, and
The movable frame 17 can be moved in the optical axis X direction by rotating the variable power operation ring 14 by fitting the cam groove 16a formed in the cam groove 16a.
【００１９】また、移動枠１７に第１の羽根保持部材２
１，第２の羽根保持部材２２及びこれらの第１，第２の
羽根保持部材２１，２２に挾持された複数の絞り羽根２
３からなる可変絞り装置２０を設け、第１の羽根保持部
材２１の外周部にコロ軸２４を突設し、このコロ軸２４
を移動枠１７の円周溝１７ａを挿通して内筒１２に設け
たカム溝１２ａに緩嵌させることにより、コロ軸２４を
カム溝１２ａに案内される従動軸に充当する。このカム
溝１２ａは、図２に示すように、光軸Ｘ方向に対してや
や傾斜した直線状あるいは曲線状をなし、コロ軸２４の
中心位置が望遠側，中間部，広角側においてそれぞれ
Ｔ，Ｎ，Ｗに示す位置となるようにカム溝１２ａの形状
を設定する。The first frame holding member 2 is mounted on the moving frame 17.
1, a second blade holding member 22 and a plurality of diaphragm blades 2 held between the first and second blade holding members 21 and 22.
3 is provided, and a roller shaft 24 is protruded from an outer peripheral portion of the first blade holding member 21.
Is loosely fitted into the cam groove 12a provided in the inner cylinder 12 through the circumferential groove 17a of the moving frame 17, so that the roller shaft 24 is applied to the driven shaft guided by the cam groove 12a. As shown in FIG. 2, the cam groove 12a has a linear shape or a curved shape slightly inclined with respect to the optical axis X direction, and the center position of the roller shaft 24 is T, T at the telephoto side, the middle portion, and the wide angle side, respectively. The shape of the cam groove 12a is set so as to be at the positions indicated by N and W.
【００２０】さらに、移動枠１７にステッピングモータ
２５を固設し、図３に示すように、その出力歯車２５ａ
を中間歯車２６を介して第２の羽根保持部材２２の歯部
２２ａに噛合させ、ステッピングモータ２５のステップ
数を設定することにより第２の羽根保持部材２２の回転
角を規制する。Further, a stepping motor 25 is fixedly mounted on the moving frame 17, and as shown in FIG.
Is meshed with the teeth 22a of the second blade holding member 22 via the intermediate gear 26, and the number of steps of the stepping motor 25 is set to regulate the rotation angle of the second blade holding member 22.
【００２１】第１の羽根保持部材２１は、複数枚（図３
では８枚）の絞り羽根２３の駆動ピン２３ａがそれぞれ
摺動自在に緩挿するカム溝２１ａを有し、第２の羽根保
持部材２２は、絞り羽根２３の支持ピン２３ｂをそれぞ
れ回転自在に枢支する軸孔２２ｂを有している。A plurality of first blade holding members 21 (FIG. 3)
The drive pins 23a of the eight aperture blades 23 each have a cam groove 21a into which the drive pins 23a are slidably and loosely inserted. The second blade holding member 22 pivotally supports the support pins 23b of the aperture blades 23, respectively. The shaft hole 22b is supported.
【００２２】なお、この可変絞り装置２０は、ズーミン
グにより第１の羽根保持部材２１が回動してそのカム溝
２１ａに絞り羽根２３の駆動ピン２３ａがいかなる位置
にある場合でも、第２の羽根保持部材２２を所定角度回
転させることにより、常に同一絞り量絞り込まれるよう
にカム溝２１ａ及び絞り羽根２３の形状を設定した等角
度絞り機構を採用する。The variable aperture device 20 is capable of rotating the second blade even if the first blade holding member 21 is rotated by zooming and the driving pin 23a of the aperture blade 23 is located in the cam groove 21a. By rotating the holding member 22 by a predetermined angle, an equiangular aperture mechanism in which the shapes of the cam groove 21a and the aperture blade 23 are set so that the aperture is always reduced by the same amount is employed.
【００２３】次に、上記のような構成からなる実施形態
の作用を説明する。まず図１を参照して、変倍操作環１
４を手動により回転させて図示の望遠側から広角側にズ
ーミングすると、連結ピン１８を介して変倍連動枠１６
が同動して回転する。変倍連動枠１６が回転すると、そ
のカム溝１６ａ及び固定ヘリコイド筒１５の長孔１５ａ
に係合しているコロ軸１９が図で左方向に駆動され、コ
ロ軸１９と一体の移動枠１７が光軸Ｘに沿って左行す
る。Next, the operation of the embodiment having the above configuration will be described. First, referring to FIG.
4 is manually rotated to zoom from the telephoto side to the wide-angle side as shown in FIG.
Rotates with it. When the variable magnification interlocking frame 16 rotates, the cam groove 16a and the long hole 15a of the fixed helicoid cylinder 15
Is driven to the left in the figure, and the moving frame 17 integrated with the roller shaft 19 moves leftward along the optical axis X.
【００２４】移動枠１７の左行により、その円周溝１７
ａ及び内筒１２のカム溝１２ａ（図２）に係合するコロ
軸２４を一体とする第１の羽根保持部材２１が光軸Ｘの
回りを所定角度回転する。このとき、コロ軸２４の回転
位置は、例えば図３にＴ（望遠），Ｎ（中間），Ｗ（広
角）で示す位置またはその中間位置となる。この第１の
羽根保持部材２１の回転により、第２の羽根保持部材２
２が停止したまま、絞り羽根２３の駆動ピン２３ａの位
置がカム溝２１ａ内を移動して絞り羽根２３のＴ，Ｎ，
Ｗあるいはその中間のそれぞれの焦点距離に対応する開
放口径が設定される。By moving the moving frame 17 to the left, the circumferential groove 17
a and the first blade holding member 21 having the roller shaft 24 integrally engaged with the cam groove 12a (FIG. 2) of the inner cylinder 12 rotates around the optical axis X by a predetermined angle. At this time, the rotational position of the roller shaft 24 is, for example, a position indicated by T (telephoto), N (intermediate), W (wide angle) in FIG. 3 or an intermediate position thereof. The rotation of the first blade holding member 21 causes the second blade holding member 2
While the stop 2 is stopped, the position of the drive pin 23a of the diaphragm blade 23 moves within the cam groove 21a, and the T, N,
An open aperture corresponding to W or each intermediate focal length is set.
【００２５】この状態から図示しないカメラ本体側から
の絞り込み信号によりステッピングモータ２５を予め定
めた所定の絞り値に対応するステップ量だけ回転させ、
出力歯車２５ａ，中間歯車２６を介して第２の羽根保持
部材２２を所定角度反時計方向へ回転させて所要の絞り
口径を得る。なお、このときの第２の羽根保持部材２２
の回転角はズーミング位置には無関係であり、変倍機構
を有しない単焦点レンズの絞り込み作動の場合と同様と
なる。In this state, the stepping motor 25 is rotated by a step amount corresponding to a predetermined aperture value in response to an aperture signal from a camera body (not shown).
The second blade holding member 22 is rotated counterclockwise by a predetermined angle via the output gear 25a and the intermediate gear 26 to obtain a required aperture. At this time, the second blade holding member 22
Is independent of the zooming position, and is the same as in the case of the aperture stop operation of the single focus lens having no zooming mechanism.
【００２６】このようなズームレンズの可変絞り装置に
よれば、従来の絞り制御装置をそのまま用いてズーミン
グによる各焦点距離に対応する開放絞り口径を高精度に
設定することができ、同時に、各焦点距離に対応して変
化した開放絞り口径に関係なく、単焦点レンズと同様の
ステップ数でステッピングモータを制御することによ
り、各絞り値に対する絞り込みを精度よく行うことが可
能になる。According to such a variable aperture device for a zoom lens, the aperture stop aperture corresponding to each focal length by zooming can be set with high accuracy using the conventional aperture control device as it is, By controlling the stepping motor with the same number of steps as the single focus lens, regardless of the aperture stop diameter changed according to the distance, it becomes possible to accurately stop down each aperture value.
【００２７】したがって、ズームレンズの可変絞り装置
をきわめて簡単な構成で安価に構成することができ、従
来のように面倒な調整工程や、開放絞り口径の変動に基
づく複雑なフィードバック制御の必要がなく、ステッピ
ングモータの高応答性を阻害するおそれもない。Therefore, the variable aperture device of the zoom lens can be constructed with a very simple configuration at a low cost, and there is no need for a complicated adjustment process and complicated feedback control based on a change in the aperture of the open aperture as in the related art. Also, there is no possibility that the high responsiveness of the stepping motor is hindered.
【００２８】また、可変焦点距離の範囲が異なるズーム
レンズに対しても鏡筒固定部に形成するカム溝のリード
を変更するだけでよく、大部分の構成部品の共通化が可
能となって安価に生産することができる。さらに、レン
ズ側とカメラ本体側との機械的な連結が不要になってカ
メラ本体の小型軽量化も可能になる。Further, even for zoom lenses having different variable focal length ranges, it is only necessary to change the leads of the cam grooves formed in the lens barrel fixing portion, and most of the components can be used in common, thereby reducing the cost. Can be produced. Further, the mechanical connection between the lens side and the camera body is not required, and the size and weight of the camera body can be reduced.
【００２９】なお、上記の実施形態においては、第１の
羽根保持部材を回動させることによりズームレンズの開
放絞り口径を設定し、第２の羽根保持部材を回動させる
ことにより所要の絞り値への絞り込みを行うようにした
が、第１の羽根保持部材により絞り込みを行い、第２の
羽根保持部材により開放口径の設定を行っても差支えな
い。In the above-described embodiment, the aperture stop of the zoom lens is set by rotating the first blade holding member, and the required aperture value is set by rotating the second blade holding member. However, the aperture may be narrowed down by the first blade holding member and the open aperture may be set by the second blade holding member.
【００３０】[0030]
【発明の効果】以上述べたように、この発明によるズー
ムレンズの可変絞り装置によれば、単焦点レンズの場合
は固定である一方の羽根保持部材をズーミングに対応し
て回動させるだけの簡単な構成で開放口径可変手段を実
現するようにしたので、従来の絞り制御機構を変更する
ことなく、高精度の可変絞り装置を得ることができる。As described above, according to the variable aperture device of the zoom lens according to the present invention, in the case of a single focus lens, one of the fixed blade holding members can be simply rotated in response to zooming. Since the open aperture variable means is realized with a simple configuration, a high-precision variable aperture device can be obtained without changing the conventional aperture control mechanism.
【００３１】そして、上記の可変絞り装置において、第
１，第２の羽根保持部材の一方がステッピングモータに
より回転駆動されるようにしたものは、カメラ本体側か
らの機械的な絞り連動機構や複雑なフィードバック制御
を必要とせず、高応答性で絞り込み精度良好な可変絞り
装置を安価に供給することができる。In the above variable aperture device, one of the first and second blade holding members is driven to rotate by a stepping motor. A variable stop device with high responsiveness and good stop-down accuracy can be supplied at low cost without the need for simple feedback control.
【００３２】さらに、上記の可変絞り装置において、開
放口径可変手段が、第１，第２の羽根保持部材の一方に
設けた従動軸とこの従動軸を案内するレンズ鏡筒固定部
に形成したカム溝からなるようにしたものは、きわめて
簡単な構成で、高精度の開放口径を得ることが可能にな
る。Further, in the above-mentioned variable aperture device, the open aperture variable means includes a driven shaft provided on one of the first and second blade holding members and a cam formed on a lens barrel fixing portion for guiding the driven shaft. In the case where the groove is formed, a highly accurate open aperture can be obtained with a very simple configuration.
【図１】この発明の一実施形態の光軸に関して上半部の
みを示す縦断面図である。FIG. 1 is a longitudinal sectional view showing only an upper half of an optical axis according to an embodiment of the present invention.
【図２】同じくその内筒に形成したカム溝の形状を示す
説明図である。FIG. 2 is an explanatory view showing the shape of a cam groove formed in the inner cylinder.
【図３】同じくその可変絞り装置を示す正面図である。FIG. 3 is a front view showing the variable aperture device.
【図４】従来の一眼レフカメラの自動絞り装置の一例を
示す分解斜視図である。FIG. 4 is an exploded perspective view showing an example of a conventional automatic aperture device of a single-lens reflex camera.
【図５】同じくそのズームレンズの開放絞り口径可変手
段に用いている中間レバーの形状を示す説明図である。FIG. 5 is an explanatory view showing the shape of an intermediate lever used in the open-aperture aperture varying means of the zoom lens.
１０：レンズ鏡筒 １１：外筒 １２：内筒 １４：変倍操作環 １６：変倍連動枠 １７：移動枠 １９：コロ軸 ２０：可変絞り装置 ２１：第１の羽根保持部材 ２１ａ：カム溝 ２２：第２の羽根保持部材 ２２ｂ：軸孔 ２３：絞り羽根 ２４：コロ軸 ２５：ステッピングモータ 10: Lens barrel 11: Outer cylinder 12: Inner cylinder 14: Magnification operation ring 16: Magnification interlocking frame 17: Moving frame 19: Roller shaft 20: Variable aperture device 21: First blade holding member 21a: Cam groove 22: Second blade holding member 22b: Shaft hole 23: Aperture blade 24: Roller shaft 25: Stepping motor
Claims (3)
それぞれ１本ずつのピンを保持する第１の羽根保持部材
及び第２の羽根保持部材のいずれか一方を所定角度回動
させることにより、上記絞り羽根を所定絞り量絞り込む
等角度絞り機構を備えた絞り装置が、ズーミングにより
光軸方向に移動する開放絞り値不変のズームレンズの可
変絞り装置において、 上記第１，第２の羽根保持部材の他方をズーミングに対
応して回動させる開放口径可変手段を設けたことを特徴
とするズームレンズの可変絞り装置。1. A method according to claim 1, wherein one of a first blade holding member and a second blade holding member holding a plurality of aperture blades from both sides thereof and holding one pin each is rotated by a predetermined angle. An aperture device having an equal-angle aperture mechanism for narrowing the aperture blades by a predetermined aperture amount is provided in a variable aperture device of an open aperture value-invariable zoom lens that moves in an optical axis direction by zooming. A variable aperture device for a zoom lens, further comprising an open aperture variable means for rotating the other member in response to zooming.
テッピングモータにより回転駆動されるようにしたこと
を特徴とする請求項１記載のズームレンズの可変絞り装
置。2. The variable stop device for a zoom lens according to claim 1, wherein one of the first and second blade holding members is driven to rotate by a stepping motor.
保持部材の一方に設けた従動軸と、レンズ鏡筒固定部に
形成され上記従動軸を案内するカム溝とからなることを
特徴とする請求項１又は２記載のズームレンズの可変絞
り装置。3. The apparatus according to claim 3, wherein the opening diameter changing means comprises a driven shaft provided on one of the first and second blade holding members, and a cam groove formed in the lens barrel fixing portion for guiding the driven shaft. The variable aperture device for a zoom lens according to claim 1 or 2, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000108380A JP2001290190A (en) | 2000-04-10 | 2000-04-10 | Variable diaphragm device for zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000108380A JP2001290190A (en) | 2000-04-10 | 2000-04-10 | Variable diaphragm device for zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001290190A true JP2001290190A (en) | 2001-10-19 |
Family
ID=18621231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000108380A Pending JP2001290190A (en) | 2000-04-10 | 2000-04-10 | Variable diaphragm device for zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001290190A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011164506A (en) * | 2010-02-15 | 2011-08-25 | Canon Inc | Light quantity adjusting device and imaging apparatus having the same |
| CN102207599A (en) * | 2010-03-29 | 2011-10-05 | 富士胶片株式会社 | Lens barrel assembly having iris diaphragm device and projector |
| JP2017078734A (en) * | 2015-10-19 | 2017-04-27 | 株式会社ニコン | Lens barrel, camera body and program |
| CN112965319A (en) * | 2021-03-11 | 2021-06-15 | 维沃移动通信有限公司 | Camera module and control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5816624U (en) * | 1981-07-23 | 1983-02-01 | 株式会社リコー | Aperture correction device |
| JPS5891435A (en) * | 1981-11-27 | 1983-05-31 | Canon Inc | Diaphragm correcting mechanism of optical equipment |
| JPH01280738A (en) * | 1988-01-08 | 1989-11-10 | Olympus Optical Co Ltd | Diaphragm controller |
-
2000
- 2000-04-10 JP JP2000108380A patent/JP2001290190A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5816624U (en) * | 1981-07-23 | 1983-02-01 | 株式会社リコー | Aperture correction device |
| JPS5891435A (en) * | 1981-11-27 | 1983-05-31 | Canon Inc | Diaphragm correcting mechanism of optical equipment |
| JPH01280738A (en) * | 1988-01-08 | 1989-11-10 | Olympus Optical Co Ltd | Diaphragm controller |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011164506A (en) * | 2010-02-15 | 2011-08-25 | Canon Inc | Light quantity adjusting device and imaging apparatus having the same |
| CN102207599A (en) * | 2010-03-29 | 2011-10-05 | 富士胶片株式会社 | Lens barrel assembly having iris diaphragm device and projector |
| US8526127B2 (en) | 2010-03-29 | 2013-09-03 | Fujifilm Corporation | Lens barrel assembly having iris diaphragm device and projector |
| JP2017078734A (en) * | 2015-10-19 | 2017-04-27 | 株式会社ニコン | Lens barrel, camera body and program |
| CN112965319A (en) * | 2021-03-11 | 2021-06-15 | 维沃移动通信有限公司 | Camera module and control method |
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