JP6212279B2 - Zoom lens - Google Patents

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JP6212279B2
JP6212279B2 JP2013085976A JP2013085976A JP6212279B2 JP 6212279 B2 JP6212279 B2 JP 6212279B2 JP 2013085976 A JP2013085976 A JP 2013085976A JP 2013085976 A JP2013085976 A JP 2013085976A JP 6212279 B2 JP6212279 B2 JP 6212279B2
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refractive power
zoom
focusing
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拓 松尾
拓 松尾
鈴木 剛司
剛司 鈴木
佐藤 治夫
治夫 佐藤
山中 久幸
久幸 山中
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株式会社ニコン
株式会社タムロン
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本発明は、35ミリ一眼レフカメラ、ビデオカメラ、デジタルカメラに好適なズームレンズ、さらに詳しくは、大型で消費電力の大きい高トルクモータを必要とすることなく、迅速な合焦作動が可能なズームレンズに関する。   The present invention is a zoom lens suitable for a 35 mm single-lens reflex camera, a video camera, and a digital camera, and more specifically, a zoom that can perform a rapid focusing operation without requiring a large torque motor with large power consumption. Related to lenses.
従来より35ミリ一眼レフカメラ、ビデオカメラ、デジタルカメラ等におけるズームレンズの合焦方式としては、前玉フォーカス方式や、インナーフォーカス方式が知られている。
前者の前玉フォーカス方式は、同一物体距離に対するフォーカスレンズの繰出し量がズーム状態によって変化せず一定であるため、鏡筒構造を簡素化できるメリットがある。しかし、合焦のために繰り出す前玉レンズの直径が大きく重量が重いため、迅速なフォーカシングには不適である。また、合焦作動によるズームレンズの重量バランスが大きく変化し、操作性が好ましくないという問題がある。
後者のインナーフォーカス方式は、一般にフォーカスレンズ径を小さくできるため、高トルクのモータを使用せずとも迅速なフォーカシングが可能となる。さらに、合焦作動時の重量バランスの変化も少なく、このインナーフォーカス方式は種々提案されている。
Conventionally, as a focusing method of a zoom lens in a 35 mm single-lens reflex camera, a video camera, a digital camera, or the like, a front lens focusing method or an inner focusing method is known.
The former front lens focus method has an advantage that the lens barrel structure can be simplified because the amount of extension of the focus lens with respect to the same object distance is constant regardless of the zoom state. However, since the front lens that is fed out for focusing has a large diameter and is heavy, it is not suitable for quick focusing. In addition, there is a problem that the weight balance of the zoom lens greatly changes due to the focusing operation, and operability is not preferable.
Since the latter inner focus method can generally reduce the diameter of the focus lens, quick focusing can be performed without using a high torque motor. Furthermore, there is little change in the weight balance during the focusing operation, and various types of this inner focus method have been proposed.
従来技術の前玉フォーカス方式でないズームレンズとして、物体側より順に正の屈折力を有する第1レンズ群G1、正の屈折力を有する第2レンズ群G2、負の屈折力を有する第3レンズ群G3、正の屈折力を有する第4レンズ群G4、負の屈折力を有する第5レンズ群G5、正の屈折力を有する第6レンズ群G6、負の屈折力を有する第7レンズ群G7を有し、広角から望遠への変倍に際して第1レンズ群、第2レンズ群、第4レンズ群、第5レンズ群、第6レンズ群、第7レンズ群を物体側へ動かし、第7レンズ群を光軸方向へ移動させてフォーカシングを行うズームレンズが提案されている(例えば、特許文献1参照)。   As a conventional zoom lens that does not have a front lens focus system, a first lens group G1 having a positive refractive power, a second lens group G2 having a positive refractive power, and a third lens group having a negative refractive power in order from the object side. G3, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, a sixth lens group G6 having a positive refractive power, and a seventh lens group G7 having a negative refractive power. The first lens group, the second lens group, the fourth lens group, the fifth lens group, the sixth lens group, and the seventh lens group are moved to the object side during zooming from wide angle to telephoto, and the seventh lens group A zoom lens that performs focusing by moving the lens in the optical axis direction has been proposed (see, for example, Patent Document 1).
特許文献1によって提案されたズームレンズは、リアフォーカス方式を採用することによって、前玉フォーカス方式に比較して、フォーカスレンズ群の小型化を達成している。
しかし、一般に最終レンズ群の光軸方向移動よって合焦する場合、最終合焦レンズ群が絞りから遠いため、最終合焦レンズ群を通る光束において、周辺光束が軸上光束よりレンズ径の高い位置を通る。従って、特に広角端において周辺光量をある程度確保する必要上、外径を極端に小さくすることが困難な問題がある。さらに、特許文献1の実施形態では、最終合焦レンズ群のレンズ枚数も3枚と多く、十分に小型軽量化を実現したとは言い難い。
The zoom lens proposed by Patent Document 1 employs a rear focus method, thereby achieving a reduction in size of the focus lens group compared to the front lens focus method.
However, in general, when focusing is performed by moving the final lens group in the optical axis direction, the final focusing lens group is far from the stop, and therefore, in the light beam passing through the final focusing lens group, the peripheral light beam has a higher lens diameter than the axial light beam. Pass through. Therefore, there is a problem that it is difficult to make the outer diameter extremely small because it is necessary to secure a certain amount of peripheral light at the wide angle end. Furthermore, in the embodiment of Patent Document 1, the number of lenses in the final focusing lens group is as large as three, and it is difficult to say that a sufficiently small size and weight reduction has been realized.
従来技術の前玉フォーカス方式でない他のズームレンズとして、物体側から順に、正の屈折力の第1群、負の屈折力の第2群、正の屈折力の第3群、負の屈折力の第4群、正の屈折力の第5群、負の屈折力の第6群より構成され、無限遠物体から至近物体へのフォーカシングの際、第4群を物体側へ移動させると共に、第6群を像側に移動させるフローティングフォーカス方式を採用したズームレンズ系が提案されている(例えば、特許文献2参照)。   As another zoom lens that is not a front lens focusing method of the prior art, in order from the object side, a first group having a positive refractive power, a second group having a negative refractive power, a third group having a positive refractive power, and a negative refractive power 4th lens group, 5th lens group having positive refractive power, and 6th lens group having negative refractive power. During focusing from an object at infinity to a close object, the fourth group is moved to the object side. A zoom lens system that employs a floating focus system that moves the six groups to the image side has been proposed (see, for example, Patent Document 2).
フローティングフォーカス方式は、移動レンズ群の数が多いので、迅速な合焦作動を行うことが困難である。フローティングフォーカス方式は、また、移動レンズ群を連結する連結部材が必要であるから、鏡筒機構の部品点数が多いことと構造が複雑化するという問題がある。   Since the floating focus method has a large number of moving lens groups, it is difficult to perform a quick focusing operation. The floating focus method also requires a connecting member for connecting the moving lens groups, and thus has a problem that the number of parts of the lens barrel mechanism is large and the structure is complicated.
従来技術の前玉フォーカス方式でない他のズームレンズとして、物体側から順に、正の屈折力の第1群、負の屈折力の第2群、後続する少なくとも2つのレンズ群を有し、フォーカスは像側から2つ目の群で行うズームレンズ系が提案されている(例えば、特許文献3参照)。   As another zoom lens that is not the front lens focus method of the prior art, the zoom lens has, in order from the object side, a first group having a positive refractive power, a second group having a negative refractive power, and at least two subsequent lens groups. A zoom lens system that performs the second group from the image side has been proposed (see, for example, Patent Document 3).
引用文献3によって提案されたズームレンズ系は、コンパクトで迅速な合焦を達成している。
しかし、特に望遠端においてフォーカス群の移動量当りのピント移動量(フォーカス位置敏感度)が大きく、必要とされる合焦作動の駆動精度が非常に高く要求され、合焦作動制御が困難であるという問題がある。
The zoom lens system proposed by reference 3 achieves compact and rapid focusing.
However, especially at the telephoto end, the amount of focus movement (focus position sensitivity) per movement amount of the focus group is large, and the required driving accuracy of the focusing operation is required to be very high, and focusing operation control is difficult. There is a problem.
特許第4226854号公報Japanese Patent No. 4226854 特開2009−265652号公報JP 2009-265652 A 特許第4227223号公報Japanese Patent No. 4227223
(発明の目的)
本発明は、上述した従来技術の前玉フォーカス方式でないズームレンズの上述した問題点に鑑みてなされたものであって、絞りと合焦レンズ群との間隔を小さくして、合焦レンズ群において周辺光束が軸上光束に比較して、極端に合焦レンズ群の径の高い位置を通ることなく、特に広角端において周辺光量を確保することができるズームレンズを提供することを目的とする。
本発明はまた、フローティングフォーカス方式を含まず、鏡筒を簡易な構成にして迅速な合焦作動を行うことができるズームレンズを提供することを目的とする。
本発明はさらに、特に望遠端においてフォーカス群の移動量当りのピント移動量すなわちフォーカス位置敏感度が大きくなく、合焦作動制御が容易なズームレンズを提供することを目的とする。
(Object of invention)
The present invention has been made in view of the above-described problems of the zoom lens that is not the front-lens focusing method of the prior art described above. In the focusing lens group, the distance between the aperture and the focusing lens group is reduced. It is an object of the present invention to provide a zoom lens capable of securing a peripheral light amount particularly at a wide-angle end without passing the peripheral light beam through a position where the diameter of the focusing lens group is extremely high as compared with the axial light beam.
It is another object of the present invention to provide a zoom lens that does not include a floating focus method and can perform a quick focusing operation with a simple structure of a lens barrel.
It is another object of the present invention to provide a zoom lens that is easy to control focusing operation, especially at the telephoto end, in which the focus movement amount per focus group movement amount, that is, the focus position sensitivity is not large.
(第1発明)
第1発明は、物体側から順に、正の屈折力の第1レンズ群、負の屈折力の第2レンズ群、正の屈折力の第3レンズ群、正の屈折力の第4レンズ群、負の屈折力の第5レンズ群を有し、広角端から望遠端への変倍に際し、少なくとも第1レンズ群、第3レンズ群、第5レンズ群が物体側に移動すると共に、第1レンズ群と第2レンズ群の間隔が増大し、第2レンズ群と第3レンズ群の間隔が減少し、第3レンズ群と第4レンズ群の間隔が増大し、第4レンズ群と第5レンズ群の間隔が減少するズームレンズにおいて、
無限遠から近距離へのフォーカシングは、第5レンズ群を像側へ移動させることで行い、以下の条件式を満足することを特徴とするズームレンズ。
0.1 ≦ | f5 | / ft ≦ 0.2 ・・・(1)
2.7 ≦ f1 / | f5 | ≦ 3.5 ・・・(2)
2.0 ≦ ft / f14t ≦ 2.85 ・・・(3)
0.2 ≦ β4t ・・・(4)
ただし、f5は第5レンズ群の焦点距離、ftは望遠端状態での全系の焦点距離、f1は第1レンズ群の焦点距離、f14tは望遠端状態での第1レンズ群から第4レンズ群までの合成の焦点距離、β4tは望遠端状態での第4レンズ群の横倍率を示す。
(First invention)
In the first invention, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, The fifth lens unit has a negative refractive power, and at the time of zooming from the wide-angle end to the telephoto end, at least the first lens unit, the third lens unit, and the fifth lens unit move to the object side, and the first lens The distance between the second lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, the distance between the third lens group and the fourth lens group increases, and the fourth lens group and the fifth lens group increase. In zoom lenses with reduced group spacing,
A zoom lens characterized in that focusing from infinity to short distance is performed by moving the fifth lens group to the image side, and satisfies the following conditional expression:
0.1 ≤ | f5 | / ft ≤ 0.2 (1)
2.7 ≤ f1 / | f5 | ≤ 3.5 (2)
2.0 ≤ ft / f14t ≤ 2.85 (3)
0.2 ≦ β4t (4)
Where f5 is the focal length of the fifth lens group, ft is the focal length of the entire system in the telephoto end state, f1 is the focal length of the first lens group, and f14t is the first to fourth lenses in the telephoto end state. The combined focal length to the group, β4t, indicates the lateral magnification of the fourth lens group in the telephoto end state.
(第2発明)
物体側から順に、正の屈折力の第1レンズ群、負の屈折力の第2レンズ群、正の屈折力の第3レンズ群、正の屈折力の第4ンズ群、負の屈折力の第5レンズ群、第6レンズ群からなり、広角端から望遠端への変倍に際し、第4レンズ群と第6レンズ群は固定であり、第1レンズ群、第3レンズ群、第5レンズ群が物体側に移動すると共に、第1ンズ群と第2レンズ群の間隔が増大し、第2レンズ群と第3レンズ群の間隔が減少し、第3レンズ群と第4レンズ群の間隔が増大し、第4レンズ群と第5レンズ群の間隔が減少するズームレンズにおいて、
無限遠から近距離へのフォーカシングは、第5レンズ群を像側へ移動させることで行い、以下の条件式を満足することを特徴とするズームレンズ。
3.0 ≦ | {1-(β5t)2} ・ (β6t)2 | ≦ 7.0 ・・・(5)
0.5 ≦ β6t ≦ 1.0 ・・・(6)
ただし、β5t、β6tはそれぞれ第5レンズ群、第6レンズ群の望遠端における横倍率を示す。
(Second invention)
In order from the object side, a first lens unit having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a negative refractive power. It consists of a fifth lens group and a sixth lens group. When zooming from the wide-angle end to the telephoto end, the fourth lens group and the sixth lens group are fixed, and the first lens group, the third lens group, and the fifth lens are fixed. As the group moves toward the object side, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, and the distance between the third lens group and the fourth lens group In a zoom lens in which the distance between the fourth lens group and the fifth lens group decreases,
A zoom lens characterized in that focusing from infinity to short distance is performed by moving the fifth lens group to the image side, and satisfies the following conditional expression:
3.0 ≦ | {1- (β5t) 2 } ・ (β6t) 2 | ≦ 7.0 ・ ・ ・ (5)
0.5 ≦ β6t ≦ 1.0 (6)
Here, β5t and β6t indicate lateral magnifications at the telephoto end of the fifth lens group and the sixth lens group, respectively.
第1発明及び第2発明のズームレンズの構成についてさらに詳しく説明する。第1発明及び第2発明のズームレンズは、物体側から順に、少なくとも正の屈折力の第1レンズ群、負の屈折力の第2レンズ群、正の屈折力の第3レンズ群、正の屈折力の第4レンズ群、負の屈折力の第5レンズ群を有する。広角端から望遠端への変倍に際して、少なくとも第1レンズ群、第3レンズ群、第5レンズ群が物体側に移動する。すなわち、第1レンズ群と第2レンズ群の間隔が増大し、第2レンズ群と第3レンズ群の間隔が減少し、第3レンズ群と第4レンズ群の間隔が増大し、第4レンズ群と第5レンズ群の間隔が減少するように移動する。この構成により、各レンズ群の変倍作用への負担が過大にならず、ズーム比の高倍率化と全長の小型化の両立を達成することができる。     The configuration of the zoom lens of the first invention and the second invention will be described in more detail. The zoom lenses of the first and second inventions are arranged in order from the object side, at least a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a positive lens A fourth lens group having a refractive power and a fifth lens group having a negative refractive power are included. At the time of zooming from the wide angle end to the telephoto end, at least the first lens group, the third lens group, and the fifth lens group move to the object side. That is, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, the distance between the third lens group and the fourth lens group increases, and the fourth lens The distance between the first lens group and the fifth lens group is decreased. With this configuration, the burden on the zooming action of each lens group is not excessive, and it is possible to achieve both a higher zoom ratio and a smaller overall length.
無限遠状態から近距離物体状態への合焦に際して、第5レンズ群を像側に移動することで行う。第5レンズ群によるフォーカシングは、レンズ径が小型、軽量であり、フォーカス機構の小型化と迅速なフォーカシングに適している。また、本発明においては、一般的な第1レンズ群でのフォーカシング方法に比べ、近距離物体における周辺光量の低下を抑えることができる。   When focusing from the infinity state to the short-distance object state, the fifth lens unit is moved to the image side. Focusing by the fifth lens group is small and light in lens diameter, and is suitable for downsizing and quick focusing of the focus mechanism. Further, in the present invention, it is possible to suppress a decrease in the amount of peripheral light in a short-distance object as compared with a general focusing method using the first lens group.
本発明において、第2レンズ群、第4レンズ群は、固定である。これにより、メカ機構の簡素化が図れる。第4レンズ群は移動させても良く、第3レンズ群と第4レンズ群の間隔を効果的に変えることによって、ズーミングにおける球面収差の変動を良好に補正することができる。さらに、ズーミングにおけるズーム中間域での像面湾曲を良好に補正することができる。第3レンズ群は物体側から順に、負レンズと正レンズの2枚で構成し、レンズ枚数を極力抑えることが望ましい。   In the present invention, the second lens group and the fourth lens group are fixed. As a result, the mechanical mechanism can be simplified. The fourth lens group may be moved. By effectively changing the distance between the third lens group and the fourth lens group, it is possible to satisfactorily correct variations in spherical aberration during zooming. Further, it is possible to satisfactorily correct the curvature of field in the zoom intermediate area during zooming. It is desirable that the third lens group is composed of a negative lens and a positive lens in order from the object side, and the number of lenses is minimized.
開口絞りは、第4レンズ群と第5レンズ群の間に配置され、他のレンズ群と独立で移動することが望ましい。この構成により、絞り径を小さく構成できると共に、全変倍範囲において絞り径を一定にすることができる。
また、フォーカス群である第5レンズ群を開口絞りと隣接させることにより、第5レンズ群を通る軸上光束と周辺光束はほぼレンズ径の同じ高さの位置を通るため、レンズ径を大きくする必要がなく、小型化が可能となる。第5レンズ群は、物体側より順に正レンズと負レンズの接合レンズで構成すると、レンズ枚数を極力抑えることができ、軽量化を容易に実現できる。
It is desirable that the aperture stop is disposed between the fourth lens group and the fifth lens group and moves independently of the other lens groups. With this configuration, the aperture diameter can be reduced and the aperture diameter can be made constant over the entire zoom range.
Further, by making the fifth lens group, which is the focus group, adjacent to the aperture stop, the on-axis light beam and the peripheral light beam passing through the fifth lens group pass through a position having almost the same lens diameter, so that the lens diameter is increased. There is no need for miniaturization. If the fifth lens group is composed of a cemented lens of a positive lens and a negative lens in order from the object side, the number of lenses can be suppressed as much as possible, and weight reduction can be easily realized.
(第1発明の実施態様)
第1発明において、変倍に際し、第2レンズ群と第4レンズ群が固定であることを特徴とする。
(Embodiment of the first invention)
In the first invention, the second lens group and the fourth lens group are fixed at the time of zooming.
第1発明において、前記第5レンズ群の像側に第6レンズ群を有し、第6レンズ群は物体側から順に、物体側の面に対し像側の面がより強い曲率をもつ正レンズ、像側の面に対し物体側の面がより強い曲率をもつ負レンズからなることを特徴とする。   1st invention WHEREIN: It has a 6th lens group in the image side of the said 5th lens group, and a 6th lens group has a curvature with a stronger curvature by the side of an image side with respect to the object side surface in order from an object side. The object side surface is composed of a negative lens having a stronger curvature than the image side surface.
第2レンズ群は物体側より順に、少なくとも負の屈折力の第2Aレンズ群、負の屈折力の第2Bレンズ群を有し、前記第2Bレンズ群を光軸とほぼ垂直方向に移動させることにより像ブレを補正することを特徴とする。   The second lens group includes at least a second A lens group having a negative refractive power and a second B lens group having a negative refractive power in order from the object side, and the second B lens group is moved in a direction substantially perpendicular to the optical axis. The image blur is corrected by the above.
(第2発明の実施態様)
第2発明において、変倍に際し、第2レンズ群と第4レンズ群が固定であることを特徴とする。
(Embodiment of the second invention)
The second invention is characterized in that the second lens group and the fourth lens group are fixed during zooming.
第2発明において、第2レンズ群は物体側より順に、少なくとも負の屈折力の第2Aレンズ群、負の屈折力の第2Bレンズ群を有し、前記第2Bレンズ群を光軸とほぼ垂直方向に移動させることにより像ブレを補正することを特徴とする。   In the second invention, the second lens group has at least a second A lens group having a negative refractive power and a second B lens group having a negative refractive power in order from the object side, and the second B lens group is substantially perpendicular to the optical axis. The image blur is corrected by moving in the direction.
(条件式(1)の説明)
条件式(1)は、望遠端の焦点距離に対する、第5レンズ群の焦点距離の比を適切に設定するための条件式である。
0.1 ≦ | f5 | / ft ≦ 0.2 ・・・(1)
ただし、f5は第5レンズ群の焦点距離、ftは望遠端状態での全系の焦点距離を示す。
(Explanation of conditional expression (1))
Conditional expression (1) is a conditional expression for appropriately setting the ratio of the focal length of the fifth lens group to the focal length of the telephoto end.
0.1 ≤ | f5 | / ft ≤ 0.2 (1)
Here, f5 represents the focal length of the fifth lens group, and ft represents the focal length of the entire system in the telephoto end state.
条件式(1)の下限値を超えると、変倍による第5レンズ群の移動量が小さくなり、フォーカスカム筒の外径を小さくすることができ、鏡筒径のコンパクト化が図れる。他方、条件式(1)の上限値を超えると、全長のコンパクト化ができない。   When the lower limit of conditional expression (1) is exceeded, the amount of movement of the fifth lens group due to zooming becomes small, the outer diameter of the focus cam barrel can be reduced, and the lens barrel diameter can be made compact. On the other hand, if the upper limit of conditional expression (1) is exceeded, the overall length cannot be reduced.
(条件式(2)の説明)
条件式(2)は、第5レンズ群に対する第1レンズ群の焦点距離の比を適切に設定するための条件式であり、各レンズ群の変倍作用をバランス化し、かつ小型化を実現するための条件式である。
2.7 ≦ f1 / | f5 | ≦ 3.5 ・・・(2)
ただし、f1は第1レンズ群の焦点距離、f5は第5レンズ群の焦点距離を示す。
(Explanation of conditional expression (2))
Conditional expression (2) is a conditional expression for appropriately setting the ratio of the focal length of the first lens group to the fifth lens group, balancing the zooming action of each lens group, and realizing miniaturization. Is a conditional expression.
2.7 ≤ f1 / | f5 | ≤ 3.5 (2)
Here, f1 represents the focal length of the first lens group, and f5 represents the focal length of the fifth lens group.
条件式(2)の下限値を超えると、最も変倍作用の高い第1レンズ群の移動量が小さくなるため、球面収差、コマ収差、倍率色収差等の補正が困難になる。他方、条件式(2)の上限値を超えると、第5レンズ群に対して第1レンズ群の移動量が大きくなり、効果的に変倍比を稼ぎ易く、球面収差やコマ収差を良好に補正することが容易となる。しかし、テレ比(望遠端の全長÷望遠端の焦点距離)が大きくなり、鏡筒全長の小型化が困難になる。   If the lower limit value of conditional expression (2) is exceeded, the amount of movement of the first lens group having the highest zooming action will be small, making it difficult to correct spherical aberration, coma aberration, lateral chromatic aberration, and the like. On the other hand, if the upper limit value of conditional expression (2) is exceeded, the amount of movement of the first lens unit with respect to the fifth lens unit becomes large, and it is easy to effectively obtain a zoom ratio, and spherical aberration and coma aberration are improved. It becomes easy to correct. However, the tele ratio (the total length of the telephoto end ÷ the focal length of the telephoto end) increases, and it becomes difficult to reduce the total length of the lens barrel.
(条件式(3)の説明)
条件式(3)は、望遠端での全系の焦点距離と、望遠端での第1レンズ群から第4レンズ群までの合成焦点距離の比を示すもので、いわゆるフォーカス群の移動量当りのピント移動量の程度を表すフォーカス位置敏感度を適切に設定するための条件式である。
2.0 ≦ ft / f14t ≦ 2.85 ・・・(3)
ただし、ftは望遠端状態での全系の焦点距離、f14tは望遠端状態での第1レンズ群から第4レンズ群までの合成の焦点距離を示す。
(Explanation of conditional expression (3))
Conditional expression (3) shows the ratio of the focal length of the entire system at the telephoto end to the combined focal length from the first lens group to the fourth lens group at the telephoto end. This is a conditional expression for appropriately setting the focus position sensitivity representing the degree of focus movement amount.
2.0 ≤ ft / f14t ≤ 2.85 (3)
Here, ft represents the focal length of the entire system in the telephoto end state, and f14t represents the combined focal length from the first lens group to the fourth lens group in the telephoto end state.
条件式(3)の下限値を超えると、フォーカス移動量が増大し、それに伴いアクチュエータの大型化を招き好ましくない。他方、条件式(3)の上限値を超えると、フォーカス群の移動量は小さくなるが、前記フォーカス位置敏感度が大きくなり、必要とされるフォーカシングの駆動精度が高くなる。従って、フォーカシング制御が困難になる。   Exceeding the lower limit value of conditional expression (3) is not preferable because the amount of focus movement increases, resulting in an increase in size of the actuator. On the other hand, if the upper limit value of conditional expression (3) is exceeded, the amount of movement of the focus group decreases, but the focus position sensitivity increases, and the required focusing drive accuracy increases. Accordingly, focusing control becomes difficult.
(条件式(4)の説明)
条件式(4)は、望遠端での第4レンズ群の横倍率を適切に設定するための条件式である。
0.2 ≦ β4t ・・・(4)
(Explanation of conditional expression (4))
Conditional expression (4) is a conditional expression for appropriately setting the lateral magnification of the fourth lens group at the telephoto end.
0.2 ≦ β4t (4)
条件式(4)の下限値を超えると、光束を収束させるための第4レンズ群のレンズ枚数が多くなり好ましくない。   Exceeding the lower limit of conditional expression (4) is not preferable because the number of lenses in the fourth lens group for converging the luminous flux increases.
(条件式(5)の説明)
条件式(5)は、フォーカス群の移動量に対するピント移動量の比を示すもので、前記フォーカス位置敏感度を適切に設定するための条件式である。
3.0 ≦ | {1-(β5t)2} ・ (β6t)2 | ≦ 7.0 ・・・(5)
ただし、β5t、β6tはそれぞれ第5レンズ群、第6レンズ群の望遠端における横倍率を示す。
(Explanation of conditional expression (5))
Conditional expression (5) indicates the ratio of the focus movement amount to the movement amount of the focus group, and is a conditional expression for appropriately setting the focus position sensitivity.
3.0 ≦ | {1- (β5t) 2 } ・ (β6t) 2 | ≦ 7.0 ・ ・ ・ (5)
Here, β5t and β6t indicate lateral magnifications at the telephoto end of the fifth lens group and the sixth lens group, respectively.
条件式(5)の下限値を超えると、フォーカス移動量が増大し、それに伴いアクチュエータの大型化を招き好ましくない。他方、条件式(5)の上限値を超えると、フォーカス群の移動量は小さくなるが、前記フォーカス位置敏感度が大きくなり、必要とされるフォーカシングの駆動精度が高くなる。従って、フォーカシング制御が困難になる。   If the lower limit value of conditional expression (5) is exceeded, the amount of focus movement increases, resulting in an increase in the size of the actuator, which is not preferable. On the other hand, if the upper limit value of conditional expression (5) is exceeded, the amount of movement of the focus group decreases, but the focus position sensitivity increases, and the required focusing drive accuracy increases. Accordingly, focusing control becomes difficult.
(条件式(6)の説明)
条件式(6)は、第6レンズ群の望遠端での横倍率を適切に設定するための条件式である。
0.5 ≦ β6t ≦ 1.0 ・・・(6)
(Explanation of conditional expression (6))
Conditional expression (6) is a conditional expression for appropriately setting the lateral magnification at the telephoto end of the sixth lens group.
0.5 ≦ β6t ≦ 1.0 (6)
条件式(6)の下限値を超えると、第6レンズ群の正の屈折力が強くなり、収差を良好に補正するためにレンズ枚数を増やさなければならず、好ましくない。他方、条件式(6)の上限値を超えると、フォーカス群の前記フォーカス位置敏感度を小さくすること、すなわち条件式(5)の上限値を満足することが困難になる。
条件式(5)及び(6)を同時に満足させることにより、オートフォーカスに最適なフォーカス方式を備えたズームレンズを提供することが可能となる。
If the lower limit of conditional expression (6) is exceeded, the positive refractive power of the sixth lens group becomes strong, and the number of lenses must be increased in order to correct aberrations satisfactorily. On the other hand, when the upper limit value of conditional expression (6) is exceeded, it becomes difficult to reduce the focus position sensitivity of the focus group, that is, to satisfy the upper limit value of conditional expression (5).
By satisfying the conditional expressions (5) and (6) at the same time, it is possible to provide a zoom lens having a focus method that is optimal for autofocus.
(一)本発明のズームレンズによれば、絞りと合焦レンズ群との間隔を小さくして、合焦レンズ群において周辺光束が軸上光束より極端に合焦レンズ群の径の高い位置を通さず、特に広角端において周辺光量を確保することができる効果を有する。
本発明のズームレンズによればまた、フローティングフォーカス方式を含まず、鏡筒を簡易な構成にしかつ迅速な合焦作動を行うことができる効果を有する。
本発明のズームレンズによればさらに、特に望遠端においてフォーカス群の移動量当りのピント移動量(フォーカス位置敏感度)が大きくなく、合焦作動制御が容易であるという効果を有する。
(1) According to the zoom lens of the present invention, the distance between the aperture and the focusing lens group is made small so that the peripheral light beam in the focusing lens group has a position where the diameter of the focusing lens group is extremely higher than the axial light beam. This has the effect of ensuring the amount of peripheral light, particularly at the wide-angle end.
According to the zoom lens of the present invention, the floating focus method is not included, and there is an effect that the lens barrel can have a simple configuration and a quick focusing operation can be performed.
According to the zoom lens of the present invention, the focus movement amount (focus position sensitivity) per movement amount of the focus group is not particularly large particularly at the telephoto end, and the focusing operation control is easy.
(二)従来より、リアフォーカス方式のズームレンズにおいて、正負正正負の5群ズームレンズが種々と提案されている。本発明も正負正正負の5群ズームレンズである。また、本発明においては、フォーカス群の像側に最終レンズ群として、もう1レンズ群を追加した正負正正負正、または正負正正負負の6群ズームレンズも含む。
最終レンズ群の第6レンズ群を追加したメリットは、第1に、変倍に際して第6レンズ群を固定群とすることで、鏡筒内部へのゴミの侵入を防ぐ点で望ましい構成となる。
第2に、第6レンズ群は物体側から順に、物体側の面に対し像側の面がより強い曲率をもつ正レンズ、像側の面に対し物体側の面がより強い曲率をもつ負レンズで構成としている。この構成により、第6レンズ群の外径を小さく抑えることができると共に、第6レンズ群を追加しない状態に対し、テレセントリック性を弱めることが容易となる。詳しくは、射出瞳位置を像側へ近づけることが可能となり、超望遠レンズでよく起こり得る一眼レフカメラに装着した際のファインダー像の光線ケラレすなわちミラー切れを防ぐ構成とすることが容易となる。
(2) Conventionally, various positive-negative positive-negative five-group zoom lenses have been proposed as rear focus zoom lenses. The present invention is also a positive / negative / positive / negative 5-group zoom lens. The present invention also includes a positive / negative / positive / positive / negative six-group zoom lens in which another lens group is added as the final lens group on the image side of the focus group.
The merit of adding the sixth lens group of the final lens group is a desirable configuration in that firstly, the sixth lens group is a fixed group at the time of zooming to prevent dust from entering the inside of the lens barrel.
Secondly, in the sixth lens group, in order from the object side, a positive lens whose image side surface has a stronger curvature than the object side surface, and a negative lens whose object side surface has a stronger curvature than the image side surface. It consists of a lens. With this configuration, the outer diameter of the sixth lens group can be kept small, and it is easy to weaken the telecentricity as compared with a state in which the sixth lens group is not added. Specifically, it is possible to bring the exit pupil position closer to the image side, and it becomes easy to have a configuration that prevents ray vignetting of the finder image, that is, mirror breakage when mounted on a single-lens reflex camera that often occurs with a super telephoto lens.
(三)本発明の実施態様において、手振れ等による画像のブレを光学系の一部のレンズ群を防振レンズ群とし、光軸と垂直方向に移動させることによって、撮影画像の変位ブレを補正している。詳しくは、第2レンズ群は、物体側から順に、少なくとも負の屈折力の第2Aレンズ群、負の屈折力の第2Bレンズ群を有し、第2Bレンズ群を防振レンズ群とし、光軸と垂直方向に移動させる。第2レンズ群は最も変倍作用が大きく、且つ防振レンズ群を小型化するために、強い負の屈折力となる傾向がある。従って、上記のように第2レンズ群を少なくとも2つのレンズ群に分割することが望ましい。これにより、負の屈折力を分散させ、第2レンズ群で発生する球面収差、非点収差、軸外コマ収差を良好に補正することが可能となる。このとき、第2Aレンズ群は負の屈折力であることが望ましい。これにより、防振レンズ群(第2Bレンズ群)に入射する軸上光束の入射角が緩やかになり、防振時の偏心収差の発生を抑えることが可能となる。 (3) In the embodiment of the present invention, image blur due to camera shake or the like is corrected by using a part of the lens group of the optical system as an anti-vibration lens group and moving in a direction perpendicular to the optical axis. doing. Specifically, the second lens group includes at least a second A lens group having a negative refractive power and a second B lens group having a negative refractive power in order from the object side. Move in the direction perpendicular to the axis. The second lens group has the greatest zooming action, and tends to have a strong negative refractive power in order to reduce the size of the image stabilizing lens group. Therefore, it is desirable to divide the second lens group into at least two lens groups as described above. Thereby, it is possible to disperse the negative refractive power and correct spherical aberration, astigmatism, and off-axis coma generated in the second lens group. At this time, it is desirable that the second A lens group has a negative refractive power. As a result, the incident angle of the axial light beam incident on the anti-vibration lens group (second B lens group) becomes gentle, and it is possible to suppress the occurrence of decentration aberrations at the time of image stabilization.
(四)第2レンズ群の小型化させる最良の形態は、物体側から順に、負の屈折力の第2Aレンズ群、負の屈折力の第2Bレンズ群、正の屈折力の第2Cレンズ群で構成することである。第2Bレンズ群の像側に正の屈折力の第2Cレンズ群を配置することにより、第2Bレンズ群の負の屈折力を強くすることが可能となり、防振量に対する像の補正量が大きくなり、防振アクチュエータの小型化に有利となる。
さらに、収差補正的観点からも第2Aレンズ群と第2Bレンズ群で発生した負の収差を正の屈折力の第2Cレンズ群で打ち消すことが可能となる。この構成は、第2レンズ群を2つに分割した場合に対して、より小型化し易いメリットがある。第2Cレンズ群は、物体側から順に、少なくとも正レンズと負レンズで構成することが好ましい。この構成により、主に防振時の非点収差を良好に補正することが可能となる。
(4) The best mode for reducing the size of the second lens group is, in order from the object side, a second A lens group having a negative refractive power, a second B lens group having a negative refractive power, and a second C lens group having a positive refractive power. It is composed of. By disposing the second C lens group having a positive refractive power on the image side of the second B lens group, the negative refractive power of the second B lens group can be increased, and the image correction amount with respect to the image stabilization amount is large. This is advantageous for downsizing the vibration-proof actuator.
Further, also from the viewpoint of aberration correction, it is possible to cancel the negative aberration generated in the second A lens group and the second B lens group with the second C lens group having a positive refractive power. This configuration has an advantage that the size can be easily reduced as compared with the case where the second lens group is divided into two. The second C lens group is preferably composed of at least a positive lens and a negative lens in order from the object side. With this configuration, it is possible to satisfactorily correct astigmatism mainly during image stabilization.
本発明の第1実施形態の画像ブレ補正機能を備えたズームレンズの無限遠合焦時の光学断面及び各レンズ群のズーム移動を示す光学断面図である。It is an optical sectional view showing an optical section at the time of focusing on infinity of a zoom lens having an image blur correction function of a first embodiment of the present invention and zoom movement of each lens group. 図1に示す第1実施形態の広角端状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 2 is a spherical aberration diagram, astigmatism diagram, and distortion diagram at the time of focusing on infinity in the wide-angle end state of the first embodiment shown in FIG. 1. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 図1に示す第1実施形態の中間焦点距離状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 6 is a spherical aberration diagram, astigmatism diagram, and distortion diagram at the time of focusing on infinity in the intermediate focal length state of the first embodiment shown in FIG. 1. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 図1に示す第1実施形態の望遠端状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 6 is a spherical aberration diagram, astigmatism diagram, and distortion diagram at the time of focusing on infinity in the telephoto end state of the first embodiment shown in FIG. 1. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 本発明の第2実施形態の画像ブレ補正機能を備えたズームレンズの無限遠合焦時の光学断面及び各レンズ群のズーム移動を示す光学断面図である。It is an optical sectional view showing an optical section at the time of focusing on infinity of a zoom lens provided with an image blur correction function of a second embodiment of the present invention and zoom movement of each lens group. 図5に示す第2実施形態の広角端状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 6 is a spherical aberration diagram, astigmatism diagram, and distortion diagram at the time of focusing on infinity in the wide-angle end state of the second embodiment shown in FIG. 5. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 図5に示す第2実施形態の中間焦点距離状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 6 is a spherical aberration diagram, an astigmatism diagram, and a distortion diagram when focusing on infinity in the intermediate focal length state of the second embodiment shown in FIG. 5. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 図5に示す第2実施形態の望遠端状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 6 is a spherical aberration diagram, astigmatism diagram, and distortion diagram at the time of focusing on infinity in the telephoto end state of the second embodiment shown in FIG. 5. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 本発明の第3実施形態の画像ブレ補正機能を備えたズームレンズの無限遠合焦時の光学断面及び各レンズ群のズーム移動を示す光学断面図である。It is an optical sectional view showing an optical section at the time of focusing on infinity of a zoom lens having an image blur correction function of a third embodiment of the present invention and zoom movement of each lens group. 図9に示す第3実施形態の広角端状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 10 is a spherical aberration diagram, astigmatism diagram, and distortion diagram at the time of focusing on infinity in the wide-angle end state of the third embodiment shown in FIG. 9. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 図9に示す第3実施形態の中間焦点距離状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 10 is a spherical aberration diagram, astigmatism diagram, and distortion diagram at the time of focusing on infinity in the intermediate focal length state of the third embodiment shown in FIG. 9. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 図9に示す第3実施形態の望遠端状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 10 is a spherical aberration diagram, an astigmatism diagram, and a distortion aberration diagram at the time of focusing on infinity in the telephoto end state of the third embodiment illustrated in FIG. 9. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 本発明の第4実施形態の画像ブレ補正機能を備えたズームレンズの無限遠合焦時の光学断面及び各レンズ群のズーム移動を示す光学断面図である。It is an optical sectional view showing an optical section at the time of infinity focusing of a zoom lens provided with an image blur correction function of a 4th embodiment of the present invention, and zoom movement of each lens group. 図13に示す第4実施形態の広角端状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 14 is a spherical aberration diagram, astigmatism diagram, and distortion diagram at the time of focusing on infinity in the wide-angle end state of the fourth embodiment shown in FIG. 13. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 図13に示す第4実施形態の中間焦点距離状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 14 is a spherical aberration diagram, an astigmatism diagram, and a distortion diagram when focusing on infinity in the intermediate focal length state of the fourth embodiment shown in FIG. 13. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line. 図13に示す第4実施形態の望遠端状態における無限遠合焦時の球面収差図、非点収差図及び歪曲収差図である。球面収差図の実線グラフは波長587.56nmの光線を示し、点線グラフは波長435.84nmの光線を示す。非点収差図のdmはd線のメリディオナル像面の収差を示し、dsはd線のサジタル像面の収差を示す。FIG. 14 is a spherical aberration diagram, an astigmatism diagram, and a distortion diagram when focusing on infinity in the telephoto end state of the fourth embodiment shown in FIG. 13. The solid line graph of the spherical aberration diagram shows a light beam having a wavelength of 587.56 nm, and the dotted line graph shows a light beam having a wavelength of 435.84 nm. In the astigmatism diagram, dm represents the aberration of the meridional image surface of the d line, and ds represents the aberration of the sagittal image surface of the d line.
以下に示す実施形態において、諸元光学データにおける面番号NSは物体側から数えたレンズ面の面番号、rはレンズ面の曲率半径(mm)、dはレンズ面の光軸上の間隔(mm)、ndはd線(波長λ=587.6nm)に対する屈折率、vdはd線(波長λ=587.6nm)に対するアッベ数をそれぞれ示している。f は焦点距離(mm)、FNo.は開口数、ωが半画角(°)を示す。面番号の後側にSを付したものは、絞りを示す。   In the embodiment described below, the surface number NS in the specification optical data is the surface number of the lens surface counted from the object side, r is the radius of curvature of the lens surface (mm), and d is the distance on the optical axis of the lens surface (mm). ), Nd represents the refractive index for the d-line (wavelength λ = 587.6 nm), and vd represents the Abbe number for the d-line (wavelength λ = 587.6 nm). f is the focal length (mm), FNo. is the numerical aperture, and ω is the half angle of view (°). Those with S on the rear side of the surface number indicate a diaphragm.
(第1実施形態)
f = 205.00〜487.00
FNo. = 4.59〜5.75
ω = 5.96〜2.51
(First embodiment)
f = 205.00-487.00
FNo. = 4.59 to 5.75
ω = 5.96 to 2.51
面番号 r d nd vd
物面 ∞ (d0)
1 482.5439 2.7000 1.80420 46.50
2 136.9302 10.0000 1.49700 81.61
3 -1311.2444 0.2000
4 154.4406 10.0000 1.49700 81.61
5 -891.1563 (d5)
6 -131.8575 2.0000 1.63854 55.45
7 -465.4831 0.4259
8 172.2754 4.0000 1.69680 55.46
9 517.9251 3.3582
10 3967.0669 1.5000 1.56732 42.84
11 45.8114 4.0000 1.84666 23.78
12 86.1419 8.0164
13 -409.3100 1.8000 1.72916 54.67
14 164.3517 (d14)
15 146.9915 1.8000 1.90366 31.31
16 80.4953 10.5000 1.48749 70.44
17 -78.4715 d(17)
18 110.9146 8.5000 1.49700 81.61
19 -78.3006 1.5000 1.83400 37.34
20 2951.7311 0.2000
21 88.4914 4.4959 1.74330 49.22
22 -3091.0648 d(22)
23S ∞ d(23)
24 188.4400 3.4000 1.67270 32.17
25 -86.6515 1.0000 1.71300 53.94
26 45.7256 d(26)
27 -96.1249 5.0000 1.60342 38.01
28 -47.3945 18.8963
29 -49.4312 1.5000 1.72342 37.99
30 -92.7467 (bf)
Surface number rd nd vd
Object ∞ (d0)
1 482.5439 2.7000 1.80420 46.50
2 136.9302 10.0000 1.49700 81.61
3 -1311.2444 0.2000
4 154.4406 10.0000 1.49700 81.61
5 -891.1563 (d5)
6 -131.8575 2.0000 1.63854 55.45
7 -465.4831 0.4259
8 172.2754 4.0000 1.69680 55.46
9 517.9251 3.3582
10 3967.0669 1.5000 1.56732 42.84
11 45.8114 4.0000 1.84666 23.78
12 86.1419 8.0164
13 -409.3100 1.8000 1.72916 54.67
14 164.3517 (d14)
15 146.9915 1.8000 1.90366 31.31
16 80.4953 10.5000 1.48749 70.44
17 -78.4715 d (17)
18 110.9146 8.5000 1.49700 81.61
19 -78.3006 1.5000 1.83400 37.34
20 2951.7311 0.2000
21 88.4914 4.4959 1.74330 49.22
22 -3091.0648 d (22)
23S ∞ d (23)
24 188.4400 3.4000 1.67270 32.17
25 -86.6515 1.0000 1.71300 53.94
26 45.7256 d (26)
27 -96.1249 5.0000 1.60342 38.01
28 -47.3945 18.8963
29 -49.4312 1.5000 1.72342 37.99
30 -92.7467 (bf)
[無限遠合焦時の可変間隔]
広角 中間 望遠
f 205.0001 300.0000 487.0000
d0 ∞ ∞ ∞
d5 28.8518 80.2974 138.2464
d14 35.8093 20.5025 6.7969
d17 1.5000 16.8068 30.5124
d22 32.5090 21.0137 2.0000
d23 1.5000 6.6922 4.8541
d26 27.2150 33.5181 54.3698
bf 64.2045 64.2045 64.2045
[Variable interval when focusing at infinity]
Wide angle Medium telephoto
f 205.0001 300.0000 487.0000
d0 ∞ ∞ ∞
d5 28.8518 80.2974 138.2464
d14 35.8093 20.5025 6.7969
d17 1.5000 16.8068 30.5124
d22 32.5090 21.0137 2.0000
d23 1.5000 6.6922 4.8541
d26 27.2150 33.5181 54.3698
bf 64.2045 64.2045 64.2045
[近距離合焦時の可変間隔 (撮影距離2.2m)]
広角 中間 望遠
f 179.3019 231.4119 288.6839
d0 1902.9363 1851.4907 1793.5415
d5 28.8518 80.2974 138.2464
d14 35.8093 20.5025 6.7969
d17 1.5000 16.8068 30.5124
d22 32.5090 21.0137 2.0000
d23 6.3420 16.4347 25.6545
d26 22.3729 23.7756 33.5695
bf 64.2045 64.2045 64.2045
[Variable interval when focusing at close range (shooting distance: 2.2m)]
Wide angle Medium telephoto
f 179.3019 231.4119 288.6839
d0 1902.9363 1851.4907 1793.5415
d5 28.8518 80.2974 138.2464
d14 35.8093 20.5025 6.7969
d17 1.5000 16.8068 30.5124
d22 32.5090 21.0137 2.0000
d23 6.3420 16.4347 25.6545
d26 22.3729 23.7756 33.5695
bf 64.2045 64.2045 64.2045
[条件式対応値 ]
条件式(1) 0.166
条件式(2) 3.450
条件式(3) 2.570
条件式(4) 0.412
条件式(5) 5.870
条件式(6) 0.857
[Values for conditional expressions]
Conditional expression (1) 0.166
Conditional expression (2) 3.450
Conditional expression (3) 2.570
Conditional expression (4) 0.412
Conditional expression (5) 5.870
Conditional expression (6) 0.857
(第2実施形態)
f = 205.04〜486.97
FNo. = 4.62〜5.78
ω = 5.90〜2.49
(Second Embodiment)
f = 205.04-486.97
FNo. = 4.62 to 5.78
ω = 5.90-2.49
面番号 r d nd vd
物面 ∞ (d0)
1 436.4287 3.0000 1.80400 46.60
2 122.1130 11.5000 1.49782 82.57
3 -605.0947 0.3000
4 125.4694 11.0000 1.49782 82.57
5 -1875.0633 (d5)
6 -496.2416 4.1000 1.60342 38.01
7 -61.4135 1.5000 1.72916 54.67
8 132.4791 5.1000
9 -188.3876 1.5000 1.51742 52.15
10 46.2336 3.8000 1.80518 25.46
11 99.3055 2.0000
12 -411.8858 1.7000 1.74330 49.22
13 143.7588 3.0000
14 153.9724 9.5000 1.60738 56.82
15 -32.5888 1.7000 1.65844 50.85
16 -200.7252 (d16)
17 121.8569 1.7000 1.90366 31.31
18 73.6444 10.0000 1.48749 70.44
19 -63.3839 (d19)
20 524.0060 7.6000 1.49700 81.61
21 -54.0683 1.7000 1.83400 37.34
22 -164.5813 0.2000
23 69.2565 4.3000 1.74330 49.22
24 203.8076 (d24)
25S ∞ (d25)
26 151.8781 3.1000 1.64769 33.84
27 -106.5949 1.1000 1.72916 54.67
28 44.3402 (d28)
29 -96.2691 5.0000 1.58144 40.89
30 -43.4021 21.0392
31 -40.3878 1.5000 1.83481 42.72
32 -68.1862 (bf)
Surface number rd nd vd
Object ∞ (d0)
1 436.4287 3.0000 1.80400 46.60
2 122.1130 11.5000 1.49782 82.57
3 -605.0947 0.3000
4 125.4694 11.0000 1.49782 82.57
5 -1875.0633 (d5)
6 -496.2416 4.1000 1.60342 38.01
7 -61.4135 1.5000 1.72916 54.67
8 132.4791 5.1000
9 -188.3876 1.5000 1.51742 52.15
10 46.2336 3.8000 1.80518 25.46
11 99.3055 2.0000
12 -411.8858 1.7000 1.74330 49.22
13 143.7588 3.0000
14 153.9724 9.5000 1.60738 56.82
15 -32.5888 1.7000 1.65844 50.85
16 -200.7252 (d16)
17 121.8569 1.7000 1.90366 31.31
18 73.6444 10.0000 1.48749 70.44
19 -63.3839 (d19)
20 524.0060 7.6000 1.49700 81.61
21 -54.0683 1.7000 1.83400 37.34
22 -164.5813 0.2000
23 69.2565 4.3000 1.74330 49.22
24 203.8076 (d24)
25S ∞ (d25)
26 151.8781 3.1000 1.64769 33.84
27 -106.5949 1.1000 1.72916 54.67
28 44.3402 (d28)
29 -96.2691 5.0000 1.58144 40.89
30 -43.4021 21.0392
31 -40.3878 1.5000 1.83481 42.72
32 -68.1862 (bf)
[無限遠合焦時の可変間隔]
広角 中間 望遠
f 205.0431 299.9821 486.9688
d0 ∞ ∞ ∞
d5 52.0770 83.8845 127.4543
d16 23.8204 10.7208 2.0000
d19 1.5000 8.8128 12.3467
d24 32.6377 23.5524 4.9613
d25 8.2078 11.1530 5.8667
d28 19.8179 31.7449 60.8092
bf 54.3185 54.3185 54.3185
[Variable interval when focusing at infinity]
Wide angle Medium telephoto
f 205.0431 299.9821 486.9688
d0 ∞ ∞ ∞
d5 52.0770 83.8845 127.4543
d16 23.8204 10.7208 2.0000
d19 1.5000 8.8128 12.3467
d24 32.6377 23.5524 4.9613
d25 8.2078 11.1530 5.8667
d28 19.8179 31.7449 60.8092
bf 54.3185 54.3185 54.3185
[近距離合焦時の可変間隔 (撮影距離2.2m)]
広角 中間 望遠
f 175.7064 225.0670 280.4931
d0 1890.0000 1858.1924 1814.6227
d5 52.0770 83.8845 127.4543
d16 23.8204 10.7208 2.0000
d19 1.5000 8.8128 12.3467
d24 32.6377 23.5524 4.9613
d25 13.6845 21.5022 26.1835
d28 14.3413 21.3957 40.4924
bf 54.3185 54.3185 54.3185
[Variable interval when focusing at close range (shooting distance 2.2m)]
Wide angle Medium telephoto
f 175.7064 225.0670 280.4931
d0 1890.0000 1858.1924 1814.6227
d5 52.0770 83.8845 127.4543
d16 23.8204 10.7208 2.0000
d19 1.5000 8.8128 12.3467
d24 32.6377 23.5524 4.9613
d25 13.6845 21.5022 26.1835
d28 14.3413 21.3957 40.4924
bf 54.3185 54.3185 54.3185
[条件式対応値 ]
条件式(1) 0.161
条件式(2) 2.902
条件式(3) 2.436
条件式(4) 0.505
条件式(5) 5.998
条件式(6) 0.841
[Values for conditional expressions]
Conditional expression (1) 0.161
Conditional expression (2) 2.902
Conditional expression (3) 2.436
Conditional expression (4) 0.505
Conditional expression (5) 5.998
Conditional expression (6) 0.841
(第3実施形態)
f = 205.00〜487.00
FNo. = 4.60〜5.76
ω = 5.96〜2.51
(Third embodiment)
f = 205.00-487.00
FNo. = 4.60 to 5.76
ω = 5.96 to 2.51
面番号 r d nd vd
物面 ∞ (d0)
1 558.3655 2.7000 1.80400 46.60
2 139.4024 10.5000 1.49782 82.57
3 -668.2361 0.2000
4 146.6085 9.5000 1.49782 82.57
5 -1118.6091 (d5)
6 -184.3582 3.0958 1.60342 38.01
7 -78.4233 1.7000 1.74400 44.90
8 -759.0474 3.0000
9 -338.8378 1.5000 1.51742 52.15
10 50.9127 4.0000 1.84666 23.78
11 82.0507 3.6574
12 -290.8254 1.5000 1.71300 53.94
13 474.8838 3.3272
14 116.6954 6.6077 1.61800 63.39
15 -73.5919 8.6519
16 -54.6227 1.7000 1.61800 63.39
17 1689.1127 (d17)
18 238.5481 1.8000 1.90366 31.31
19 100.9122 10.5000 1.49700 81.61
20 -62.9714 (d20)
21 172.8037 8.5000 1.48749 70.44
22 -69.2343 1.5000 1.83400 37.34
23 -210.9192 0.2000
24 72.4017 4.3000 1.74330 49.22
25 166.6731 (d25)
26(絞り) ∞ (d26)
27 185.1203 3.0000 1.67270 32.17
28 -88.3740 1.0000 1.69680 55.46
29 45.2699 (d29)
30 -87.7232 5.0000 1.51742 52.15
31 -48.0961 24.4805
32 -56.4244 1.5000 1.72916 54.67
33 -109.4653 (bf)
Surface number rd nd vd
Object ∞ (d0)
1 558.3655 2.7000 1.80400 46.60
2 139.4024 10.5000 1.49782 82.57
3 -668.2361 0.2000
4 146.6085 9.5000 1.49782 82.57
5 -1118.6091 (d5)
6 -184.3582 3.0958 1.60342 38.01
7 -78.4233 1.7000 1.74400 44.90
8 -759.0474 3.0000
9 -338.8378 1.5000 1.51742 52.15
10 50.9127 4.0000 1.84666 23.78
11 82.0507 3.6574
12 -290.8254 1.5000 1.71300 53.94
13 474.8838 3.3272
14 116.6954 6.6077 1.61800 63.39
15 -73.5919 8.6519
16 -54.6227 1.7000 1.61800 63.39
17 1689.1127 (d17)
18 238.5481 1.8000 1.90366 31.31
19 100.9122 10.5000 1.49700 81.61
20 -62.9714 (d20)
21 172.8037 8.5000 1.48749 70.44
22 -69.2343 1.5000 1.83400 37.34
23 -210.9192 0.2000
24 72.4017 4.3000 1.74330 49.22
25 166.6731 (d25)
26 (Aperture) ∞ (d26)
27 185.1203 3.0000 1.67270 32.17
28 -88.3740 1.0000 1.69680 55.46
29 45.2699 (d29)
30 -87.7232 5.0000 1.51742 52.15
31 -48.0961 24.4805
32 -56.4244 1.5000 1.72916 54.67
33 -109.4653 (bf)
[無限遠合焦時の可変間隔]
広角 中間 望遠
f 205.0000 300.0000 486.9998
d0 ∞ ∞ ∞
d5 22.5976 77.8408 132.5976
d17 28.7349 20.1857 11.5943
d20 1.5000 10.0493 18.6406
d25 35.3321 22.2590 3.0000
d26 3.7089 7.5300 4.8106
d29 29.7060 38.9579 60.9364
bf 54.3186 54.3186 54.3186
[Variable interval when focusing at infinity]
Wide angle Medium telephoto
f 205.0000 300.0000 486.9998
d0 ∞ ∞ ∞
d5 22.5976 77.8408 132.5976
d17 28.7349 20.1857 11.5943
d20 1.5000 10.0493 18.6406
d25 35.3321 22.2590 3.0000
d26 3.7089 7.5300 4.8106
d29 29.7060 38.9579 60.9364
bf 54.3186 54.3186 54.3186
[近距離合焦時の可変間隔 (撮影距離2.2m)]
広角 中間 望遠
f 177.4144 228.3957 283.2414
d0 1900.0000 1844.7568 1790.0000
d5 22.5976 77.8408 132.5976
d17 28.7349 20.1857 11.5943
d20 1.5000 10.0493 18.6406
d25 35.3321 22.2590 3.0000
d26 8.5748 16.9032 24.2275
d29 24.8400 29.5848 41.5195
bf 54.3186 54.3186 54.3186
[Variable interval when focusing at close range (shooting distance: 2.2m)]
Wide angle Medium telephoto
f 177.4144 228.3957 283.2414
d0 1900.0000 1844.7568 1790.0000
d5 22.5976 77.8408 132.5976
d17 28.7349 20.1857 11.5943
d20 1.5000 10.0493 18.6406
d25 35.3321 22.2590 3.0000
d26 8.5748 16.9032 24.2275
d29 24.8400 29.5848 41.5195
bf 54.3186 54.3186 54.3186
[条件式対応値 ]
条件式(1) 0.173
条件式(2) 3.100
条件式(3) 2.536
条件式(4) 0.454
条件式(5) 6.182
条件式(6) 0.928
[Values for conditional expressions]
Conditional expression (1) 0.173
Conditional expression (2) 3.100
Conditional expression (3) 2.536
Conditional expression (4) 0.454
Conditional expression (5) 6.182
Conditional expression (6) 0.928
(第4実施形態)
f = 205.00〜487.00
FNo. = 4.59〜5.75
ω = 5.96〜2.51
(Fourth embodiment)
f = 205.00-487.00
FNo. = 4.59 to 5.75
ω = 5.96 to 2.51
面番号 r d nd vd
物面 ∞ (d0)
1 3780.7912 2.7000 1.80420 46.50
2 164.6767 11.0525 1.49700 81.61
3 -266.3818 0.2000
4 132.1963 8.0978 1.49700 81.61
5 1175.7104 (d5)
6 314.4323 5.0831 1.62004 36.30
7 -106.1601 6.5862
8 -74.4300 1.8000 1.71736 29.50
9 -1202.3391 7.6422
10 -297.8350 1.5000 1.56883 56.04
11 45.2037 4.0000 1.84666 23.78
12 92.7276 4.0000
13 -194.4620 1.8000 1.72342 37.99
14 246.7662 3.0000
15 134.4913 3.0000 1.63854 55.45
16 184.8712 (d16)
17 113.4290 1.8000 1.90366 31.31
18 69.2087 10.5000 1.48749 70.44
19 -71.3663 (d19)
20 134.9908 8.5000 1.49700 81.61
21 -76.8654 1.5000 1.83400 37.34
22 -283.4054 0.2000
23 91.8322 4.7406 1.74330 49.22
24 223.4482 (d24)
25S ∞ (d25)
26 433.9229 3.8000 1.72342 37.99
27 -37.6454 1.0000 1.69680 55.46
28 47.4180 (bf)
Surface number rd nd vd
Object ∞ (d0)
1 3780.7912 2.7000 1.80420 46.50
2 164.6767 11.0525 1.49700 81.61
3 -266.3818 0.2000
4 132.1963 8.0978 1.49700 81.61
5 1175.7104 (d5)
6 314.4323 5.0831 1.62004 36.30
7 -106.1601 6.5862
8 -74.4300 1.8000 1.71736 29.50
9 -1202.3391 7.6422
10 -297.8350 1.5000 1.56883 56.04
11 45.2037 4.0000 1.84666 23.78
12 92.7276 4.0000
13 -194.4620 1.8000 1.72342 37.99
14 246.7662 3.0000
15 134.4913 3.0000 1.63854 55.45
16 184.8712 (d16)
17 113.4290 1.8000 1.90366 31.31
18 69.2087 10.5000 1.48749 70.44
19 -71.3663 (d19)
20 134.9908 8.5000 1.49700 81.61
21 -76.8654 1.5000 1.83400 37.34
22 -283.4054 0.2000
23 91.8322 4.7406 1.74330 49.22
24 223.4482 (d24)
25S ∞ (d25)
26 433.9229 3.8000 1.72342 37.99
27 -37.6454 1.0000 1.69680 55.46
28 47.4180 (bf)
[無限遠合焦時の可変間隔]
広角 中間 望遠
f 205.0000 299.9999 486.9996
d0 ∞ ∞ ∞
d5 21.4303 65.9246 120.2513
d16 38.5508 22.5010 8.7809
d19 1.5000 17.5498 31.2699
d24 31.4929 20.4210 2.3032
d25 2.5139 5.7070 1.5000
bf 104.0719 111.9506 134.2754
[Variable interval when focusing at infinity]
Wide angle Medium telephoto
f 205.0000 299.9999 486.9996
d0 ∞ ∞ ∞
d5 21.4303 65.9246 120.2513
d16 38.5508 22.5010 8.7809
d19 1.5000 17.5498 31.2699
d24 31.4929 20.4210 2.3032
d25 2.5139 5.7070 1.5000
bf 104.0719 111.9506 134.2754
[近距離合焦時の可変間隔 (撮影距離2.2m)]
広角 中間 望遠
f 179.1165 231.7878 291.6486
d0 1907.2564 1862.7622 1808.4353
d5 21.4303 65.9246 120.2513
d16 38.5508 22.5010 8.7809
d19 1.5000 17.5498 31.2699
d24 31.4929 20.4210 2.3032
d25 7.7118 15.8608 22.2165
bf 98.8740 101.7968 113.5589
[Variable interval when focusing at close range (shooting distance: 2.2m)]
Wide angle Medium telephoto
f 179.1165 231.7878 291.6486
d0 1907.2564 1862.7622 1808.4353
d5 21.4303 65.9246 120.2513
d16 38.5508 22.5010 8.7809
d19 1.5000 17.5498 31.2699
d24 31.4929 20.4210 2.3032
d25 7.7118 15.8608 22.2165
bf 98.8740 101.7968 113.5589
[条件式対応値]
条件式(1) 0.168
条件式(2) 3.382
条件式(3) 2.640
条件式(4) 0.545
条件式(5)
条件式(6)
[Values for conditional expressions]
Conditional expression (1) 0.168
Conditional expression (2) 3.382
Conditional expression (3) 2.640
Conditional expression (4) 0.545
Conditional expression (5)
Conditional expression (6)
S 絞り
IP 結像面
1,2,3,・・・ レンズ面
L1,L2,L3,・・・ レンズ群
L2A,L2B,L2C レンズ群
S stop IP imaging surface 1, 2, 3,... Lens surface L1, L2, L3,... Lens group L2A, L2B, L2C lens group

Claims (7)

  1. 物体側から順に、正の屈折力の第1レンズ群、負の屈折力の第2レンズ群、正の屈折力の第3レンズ群、正の屈折力の第4レンズ群、負の屈折力の第5レンズ群を有し、広角端から望遠端への変倍に際し、少なくとも第1レンズ群、第3レンズ群、第5レンズ群が物体側に移動すると共に、第1レンズ群と第2レンズ群の間隔が増大し、第2レンズ群と第3レンズ群の間隔が減少し、第3レンズ群と第4レンズ群の間隔が増大し、第4レンズ群と第5レンズ群の間隔が減少するズームレンズにおいて、
    無限遠から近距離へのフォーカシングは、第5レンズ群のみを像側へ移動させることで行い、以下の条件式を満足することを特徴とするズームレンズ。
    0.1 ≦ | f5 | / ft ≦ 0.2 ・・・(1)
    2.7 ≦ f1 / | f5 | ≦ 3.5 ・・・(2)
    2.0 ≦ ft / f14t ≦ 2.85 ・・・(3)
    0.2 ≦ β4t ・・・(4)
    ただし、f5は第5レンズ群の焦点距離、ftは望遠端状態での全系の焦点距離、f1は第1レンズ群の焦点距離、f14tは望遠端状態での第1レンズ群から第4レンズ群までの合成の焦点距離、β4tは望遠端状態での第4レンズ群の横倍率を示す。
    In order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a negative refractive power. A fifth lens group, and at the time of zooming from the wide-angle end to the telephoto end, at least the first lens group, the third lens group, and the fifth lens group move to the object side, and the first lens group and the second lens; The distance between the groups increases, the distance between the second lens group and the third lens group decreases, the distance between the third lens group and the fourth lens group increases, and the distance between the fourth lens group and the fifth lens group decreases. Zoom lens
    A zoom lens characterized in that focusing from infinity to short distance is performed by moving only the fifth lens group to the image side, and satisfies the following conditional expression.
    0.1 ≤ | f5 | / ft ≤ 0.2 (1)
    2.7 ≤ f1 / | f5 | ≤ 3.5 (2)
    2.0 ≤ ft / f14t ≤ 2.85 (3)
    0.2 ≦ β4t (4)
    Where f5 is the focal length of the fifth lens group, ft is the focal length of the entire system in the telephoto end state, f1 is the focal length of the first lens group, and f14t is the first to fourth lenses in the telephoto end state. The combined focal length to the group, β4t, indicates the lateral magnification of the fourth lens group in the telephoto end state.
  2. 変倍に際し、第2レンズ群と第4レンズ群が固定であることを特徴とする請求項1に記載のズームレンズ。   The zoom lens according to claim 1, wherein the second lens group and the fourth lens group are fixed during zooming.
  3. 前記第5レンズ群の像側に第6レンズ群を有し、第6レンズ群は物体側から順に、物体側の面に対し像側の面がより強い曲率をもつ正レンズ、像側の面に対し物体側の面がより強い曲率をもつ負レンズからなることを特徴とする請求項1又は2に記載のズームレンズ。   The sixth lens group has a sixth lens group on the image side of the fifth lens group, and the sixth lens group, in order from the object side, is a positive lens having a stronger curvature on the image side with respect to the object side surface, and an image side surface The zoom lens according to claim 1, wherein the object side surface is a negative lens having a stronger curvature.
  4. 第2レンズ群は物体側より順に、少なくとも負の屈折力の第2Aレンズ群、負の屈折力の第2Bレンズ群を有し、前記第2Bレンズ群を光軸とほぼ垂直方向に移動させることにより像ブレを補正することを特徴とする請求項1〜3のうちのいずれか一項に記載のズームレンズ。   The second lens group includes at least a second A lens group having a negative refractive power and a second B lens group having a negative refractive power in order from the object side, and the second B lens group is moved in a direction substantially perpendicular to the optical axis. The zoom lens according to claim 1, wherein image blur is corrected by the zoom lens.
  5. 物体側から順に、正の屈折力の第1レンズ群、負の屈折力の第2レンズ群、正の屈折力の第3レンズ群、正の屈折力の第4ンズ群、負の屈折力の第5レンズ群、第6レンズ群からなり、広角端から望遠端への変倍に際し、第4レンズ群と第6レンズ群は固定であり、第1レンズ群、第3レンズ群、第5レンズ群が物体側に移動すると共に、第1ンズ群と第2レンズ群の間隔が増大し、第2レンズ群と第3レンズ群の間隔が減少し、第3レンズ群と第4レンズ群の間隔が増大し、第4レンズ群と第5レンズ群の間隔が減少するズームレンズにおいて、
    無限遠から近距離へのフォーカシングは、第5レンズ群を像側へ移動させることで行い、以下の条件式を満足することを特徴とするズームレンズ。
    3.0 ≦ | {1-(β5t)2} ・ (β6t)2 | ≦ 7.0 ・・・(5)
    0.5 ≦ β6t ≦ 1.0 ・・・(6)
    ただし、β5t、β6tはそれぞれ第5レンズ群、第6レンズ群の望遠端における横倍率を示す。
    In order from the object side, a first lens unit having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a negative refractive power. It consists of a fifth lens group and a sixth lens group. When zooming from the wide-angle end to the telephoto end, the fourth lens group and the sixth lens group are fixed, and the first lens group, the third lens group, and the fifth lens are fixed. As the group moves toward the object side, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, and the distance between the third lens group and the fourth lens group In a zoom lens in which the distance between the fourth lens group and the fifth lens group decreases,
    A zoom lens characterized in that focusing from infinity to short distance is performed by moving the fifth lens group to the image side, and satisfies the following conditional expression:
    3.0 ≦ | {1- (β5t) 2 } ・ (β6t) 2 | ≦ 7.0 ・ ・ ・ (5)
    0.5 ≦ β6t ≦ 1.0 (6)
    Here, β5t and β6t indicate lateral magnifications at the telephoto end of the fifth lens group and the sixth lens group, respectively.
  6. 変倍に際し、第2レンズ群と第4レンズ群が固定であることを特徴とする請求項5に記載のズームレンズ。   6. The zoom lens according to claim 5, wherein the second lens group and the fourth lens group are fixed during zooming.
  7. 第2レンズ群は物体側より順に、少なくとも負の屈折力の第2Aレンズ群、負の屈折力の第2Bレンズ群を有し、前記第2Bレンズ群を光軸とほぼ垂直方向に移動させることにより像ブレを補正することを特徴とする請求項5又は6に記載のズームレンズ。   The second lens group includes at least a second A lens group having a negative refractive power and a second B lens group having a negative refractive power in order from the object side, and the second B lens group is moved in a direction substantially perpendicular to the optical axis. The zoom lens according to claim 5, wherein image blur is corrected by the zoom lens.
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