JP6395360B2 - Zoom lens and imaging apparatus having the same - Google Patents

Zoom lens and imaging apparatus having the same Download PDF

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JP6395360B2
JP6395360B2 JP2013208126A JP2013208126A JP6395360B2 JP 6395360 B2 JP6395360 B2 JP 6395360B2 JP 2013208126 A JP2013208126 A JP 2013208126A JP 2013208126 A JP2013208126 A JP 2013208126A JP 6395360 B2 JP6395360 B2 JP 6395360B2
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修一 茂木
修一 茂木
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Canon Inc
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Description

本発明はズームレンズに関するものであり、例えばデジタルスチルカメラ、ビデオカメラ、監視カメラ、放送用カメラ、銀塩フィルム用カメラ等の撮像装置に用いる撮影レンズとして好適なものである。   The present invention relates to a zoom lens, and is suitable as a photographic lens used in an imaging apparatus such as a digital still camera, a video camera, a surveillance camera, a broadcast camera, a silver salt film camera, and the like.

近年、固体撮像素子を用いた撮像装置は、高機能化され、又装置全体が小型化されている。そしてそれに用いる撮影光学系として広画角かつ高ズーム比で、しかも全ズーム範囲にわたり高い光学性能を有したズームレンズであること等が要求されている。   In recent years, an imaging apparatus using a solid-state imaging element has been improved in function, and the entire apparatus has been downsized. As a photographing optical system used therefor, a zoom lens having a wide angle of view, a high zoom ratio, and high optical performance over the entire zoom range is required.

これらの要求を満足するズームレンズの１つとして、物体側より像側へ順に、正、負、正、負、正の屈折力の第１レンズ群乃至第５レンズ群よりなる５群ズームレンズが知られている（特許文献１〜３）。特許文献１、２では各レンズ群を移動させてズーミングを行い、高ズーム比で全ズーム範囲にわたり高い光学性能を有したズームレンズを開示している。特許文献３では第１レンズ群を固定とし、第２レンズ群乃至第５レンズ群を移動させてズーミングを行った小型のズームレンズを開示している。   As one of the zoom lenses that satisfy these requirements, there is a five-unit zoom lens including first to fifth lens units having positive, negative, positive, negative, and positive refractive powers in order from the object side to the image side. It is known (patent documents 1 to 3). Patent Documents 1 and 2 disclose zoom lenses having high optical performance over a whole zoom range with a high zoom ratio by performing zooming by moving each lens group. Patent Document 3 discloses a small zoom lens in which the first lens group is fixed and zooming is performed by moving the second lens group to the fifth lens group.

特開２０１０−２７６６５５号公報JP 2010-276655 A 特開２０１１−８１１１３号公報JP 2011-81113 A 特開２００８−２３３１６１号公報JP 2008-233161 A

前述した屈折力配置の５群ズームレンズは全系の小型化を図りつつ、高ズーム比化を図りつつ高い光学性能を得ることが比較的容易である。しかしながら望遠端での焦点距離を長くしつつ、更に高ズーム比化を図ろうとすると望遠側のズーム領域において球面収差、非点収差、そして色収差等の諸収差が増大してきて、高い光学性能を維持するのが難しくなってくる。また全系の小型化を図るために各レンズ群の屈折力を強めると望遠端において軸上色収差、倍率色収差及びコマ収差等が多く発生し、これらの諸収差の補正が困難となる。   The above-described five-group zoom lens having a refractive power arrangement is relatively easy to obtain high optical performance while achieving a high zoom ratio while reducing the size of the entire system. However, increasing the zoom ratio while increasing the focal length at the telephoto end increases spherical aberration, astigmatism, chromatic aberration, and other aberrations in the zoom area on the telephoto side, maintaining high optical performance. It becomes difficult to do. Further, if the refractive power of each lens group is increased in order to reduce the size of the entire system, axial chromatic aberration, lateral chromatic aberration, coma aberration, and the like frequently occur at the telephoto end, and it becomes difficult to correct these various aberrations.

前述した５群ズームレンズにおいて、高ズーム比化を図りつつ全ズーム範囲にわたり高い光学性能を得るには各レンズ群の屈折力や各レンズ群のズーミングに伴う移動条件等を適切に設定することが重要となる。例えば、第１レンズ群と第２レンズ群のズーミングの際の移動条件や第２レンズ群の屈折力そしてバックフォーカス等を適切に設定することが重要となる。これらの要素を適切に設定しないと全系の小型化を図り、かつ高ズーム比で、全ズーム範囲で高い光学性能を得るのが大変困難になってくる。   In the above-described 5-group zoom lens, in order to obtain a high optical performance over the entire zoom range while achieving a high zoom ratio, it is necessary to appropriately set the refractive power of each lens group and the movement conditions accompanying zooming of each lens group. It becomes important. For example, it is important to appropriately set the movement conditions during zooming of the first lens group and the second lens group, the refractive power of the second lens group, the back focus, and the like. If these elements are not set appropriately, it is very difficult to reduce the size of the entire system and to obtain high optical performance in the entire zoom range with a high zoom ratio.

本発明は、高ズーム比で全ズーム範囲にわたり高い光学性能が容易に得られる全系が小型のズームレンズ及びそれを有する撮像装置の提供を目的とする。   An object of the present invention is to provide a zoom lens in which the entire system can be easily obtained with a high zoom ratio and high optical performance over the entire zoom range, and an image pickup apparatus having the zoom lens.

本発明のズームレンズは、物体側より像側へ順に配置された、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、負の屈折力の第４レンズ群、正の屈折力の第５レンズ群からなり、ズーミングに際して隣り合うレンズ群の間隔が変化するズームレンズであって、
前記第１レンズ群は、負レンズと該負レンズの像側に配置された正レンズが接合された接合レンズからなり、前記第２レンズ群の焦点距離をｆ２、望遠端におけるバックフォーカスをＢＦｔ、広角端から望遠端へのズーミングにおける前記第１レンズ群と前記第２レンズ群の移動量を各々Ｍ１，Ｍ２、前記第１レンズ群の焦点距離をｆ１とするとき、
２．９１≦｜ｆ２｜／Ｂｆｔ＜４．５０
−３．４８＜Ｍ１／Ｍ２＜−０．０１
３．２６＜ｆ１／｜ｆ２｜＜４．４７
なる条件式を満足することを特徴としている。 The zoom lens according to the present invention includes 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, arranged in order from the object side to the image side. A zoom lens comprising a fourth lens group having a refractive power and a fifth lens group having a positive refractive power, wherein the distance between adjacent lens groups changes during zooming,
The first lens group includes a cemented lens in which a negative lens and a positive lens arranged on the image side of the negative lens are cemented, the focal length of the second lens group is f2, the back focus at the telephoto end is BFt, When the movement amounts of the first lens group and the second lens group in zooming from the wide-angle end to the telephoto end are M1 and M2 , respectively, and the focal length of the first lens group is f1 ,
2.91 ≦ | f2 | / Bft <4.50
−3.48 <M1 / M2 <−0.01
3.26 <f1 / | f2 | <4.47
It satisfies the following conditional expression.

本発明によれば、高ズーム比で全ズーム範囲にわたり高い光学性能が容易に得られる全系が小型のズームレンズが得られる。   According to the present invention, it is possible to obtain a zoom lens in which the entire system can be easily obtained with a high zoom ratio and high optical performance over the entire zoom range.

実施例１のズームレンズの広角端におけるレンズ断面図Lens cross-sectional view at the wide-angle end of the zoom lens of Example 1 （Ａ），（Ｂ），（Ｃ） 実施例１のズームレンズの広角端、中間のズーム位置、望遠端における諸収差図(A), (B), (C) Various aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens of Example 1. 実施例２のズームレンズの広角端におけるレンズ断面図Lens sectional view at the wide-angle end of the zoom lens according to Embodiment 2 （Ａ），（Ｂ），（Ｃ） 実施例２のズームレンズの広角端、中間のズーム位置、望遠端における諸収差図(A), (B), (C) Various aberration diagrams of the zoom lens of Example 2 at the wide-angle end, the intermediate zoom position, and the telephoto end. 実施例３のズームレンズの広角端におけるレンズ断面図Lens sectional view at the wide-angle end of the zoom lens according to Embodiment 3 （Ａ），（Ｂ），（Ｃ） 実施例３のズームレンズの広角端、中間のズーム位置、望遠端における諸収差図(A), (B), (C) Various aberration diagrams of the zoom lens of Example 3 at the wide-angle end, the intermediate zoom position, and the telephoto end. 実施例４のズームレンズの広角端におけるレンズ断面図Lens sectional view at the wide-angle end of the zoom lens according to Embodiment 4 （Ａ），（Ｂ），（Ｃ） 実施例４のズームレンズの広角端、中間のズーム位置、望遠端における諸収差図(A), (B), (C) Various aberration diagrams of the zoom lens of Example 4 at the wide-angle end, the intermediate zoom position, and the telephoto end 実施例５のズームレンズの広角端におけるレンズ断面図Lens sectional view at the wide-angle end of the zoom lens according to Embodiment 5 （Ａ），（Ｂ），（Ｃ） 実施例５のズームレンズの広角端、中間のズーム位置、望遠端における諸収差図(A), (B), (C) Various aberration diagrams of the zoom lens of Example 5 at the wide-angle end, the intermediate zoom position, and the telephoto end 撮像装置の一例としての要部概略図Main part schematic diagram as an example of imaging device

以下に、本発明の好ましい実施の形態を、添付の図面に基づいて詳細に説明する。本発明のズームレンズは、物体側より像側へ順に配置された、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、負の屈折力の第４レンズ群、正の屈折力の第５レンズ群からなり、ズーミングに際して隣り合うレンズ群の間隔が変化する。第１レンズ群は、負レンズと負レンズの像側に配置された正レンズが接合された接合レンズからなっている。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The zoom lens according to the present invention includes 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, arranged in order from the object side to the image side. It consists of a fourth lens group having a refractive power and a fifth lens group having a positive refractive power, and the distance between adjacent lens groups changes during zooming. The first lens group, a positive lens disposed on the image side of the negative lens and the negative lens is made from bonded cemented lens.

図１は本発明での実施例１のズームレンズの広角端（短焦点距離端）におけるレンズ断面図、図２（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例１のズームレンズの広角端、中間のズーム位置、望遠端（長焦点距離端）における収差図である。図３は本発明での実施例２のズームレンズの広角端におけるレンズ断面図、図４（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例２のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。   FIG. 1 is a lens cross-sectional view at the wide-angle end (short focal length end) of the zoom lens according to Embodiment 1 of the present invention, and FIGS. 2A, 2B, and 2C are respectively the wide-angle of the zoom lens according to Embodiment 1. FIG. 6 is an aberration diagram at an end, an intermediate zoom position, and a telephoto end (long focal length end). 3 is a lens cross-sectional view at the wide-angle end of the zoom lens according to the second embodiment of the present invention. FIGS. 4A, 4B, and 4C are respectively the wide-angle end and the intermediate zoom position of the zoom lens according to the second embodiment. FIG. 6 is an aberration diagram at the telephoto end.

図５は本発明での実施例３のズームレンズの広角端におけるレンズ断面図、図６（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例３のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。図７は本発明での実施例４のズームレンズの広角端におけるレンズ断面図、図８（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例４のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。   5 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 3 of the present invention. FIGS. 6A, 6B, and 6C are respectively the wide-angle end and intermediate zoom position of the zoom lens according to Embodiment 3. FIG. 6 is an aberration diagram at the telephoto end. 7 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 4 of the present invention. FIGS. 8A, 8B, and 8C are zoom positions at the wide-angle end and intermediate position of the zoom lens according to Embodiment 4, respectively. FIG. 6 is an aberration diagram at the telephoto end.

図９は本発明での実施例５のズームレンズの広角端におけるレンズ断面図、図１０（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例５のズームレンズの広角端、中間のズーム位置、望遠端における収差図である。図１１は本発明の撮像装置の要部概略図である。   9 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 5 of the present invention. FIGS. 10A, 10B, and 10C are respectively the wide-angle end and the intermediate zoom position of the zoom lens according to Embodiment 5. FIG. 6 is an aberration diagram at the telephoto end. FIG. 11 is a schematic diagram of a main part of the imaging apparatus of the present invention.

各実施例のズームレンズは、ビデオカメラ、デジタルカメラ、監視用カメラ、ＴＶカメラ等の撮像装置に用いられる撮像光学系である。レンズ断面図において、左方が被写体側（物体側）（前方）で、右方が像側（後方）である。レンズ断面図において、Ｌ１は正の屈折力（光学的パワー＝焦点距離の逆数）の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群、Ｌ３は正の屈折力の第３レンズ群、Ｌ４は負の屈折力の第４レンズ群、Ｌ５は正の屈折力の第５レンズ群である。   The zoom lens of each embodiment is an imaging optical system used in an imaging apparatus such as a video camera, a digital camera, a surveillance camera, and a TV camera. In the lens cross-sectional view, the left side is the subject side (object side) (front), and the right side is the image side (rear). In the lens cross-sectional view, L1 is a first lens group having a positive refractive power (optical power = reciprocal of focal length), L2 is a second lens group having a negative refractive power, and L3 is a third lens group having a positive refractive power. , L4 is a fourth lens group having a negative refractive power, and L5 is a fifth lens group having a positive refractive power.

各実施例のレンズ断面図において、ＳＰは解放Ｆナンバーの光束を決定する開口絞りであり、第３レンズ群Ｌ３の物体側又は第３レンズ群Ｌ３中に位置している。Ｇは光学フィルター、フェースプレート等に相当する光学ブロックである。ＩＰは像面であり、ビデオカメラやデジタルカメラの撮影光学系として使用する際にはＣＣＤセンサやＣＭＯＳセンサ等の固体撮像素子（光電変換素子）の撮像面に相当し、銀塩フィルム用カメラの撮像光学系として使用する際にはフィルム面に相当する。   In the lens cross-sectional views of the respective embodiments, SP is an aperture stop that determines the light flux of the open F number, and is located on the object side of the third lens unit L3 or in the third lens unit L3. G is an optical block corresponding to an optical filter, a face plate, or the like. IP is an image plane, which corresponds to an imaging plane of a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor when used as a photographing optical system for a video camera or a digital camera. When used as an imaging optical system, it corresponds to a film surface.

収差図において、ＦｎｏはＦナンバー、ωは半画角（度）である。球面収差において、ｄはｄ線（実線）、ｇはｇ線（点線）を表示し、非点収差において、ΔＭはｄ線におけるメリジオナル像面、ΔＳはｄ線におけるサジタル像面を表示し、歪曲収差においてはｄ線を表示し、倍率色収差においてはｄ線に対するｇ線を表示している。 In the aberration diagrams, Fno is the F number, and ω is the half angle of view (degrees). In spherical aberration, d represents d line (solid line), g represents g line (dotted line), and astigmatism, ΔM represents a meridional image plane in d line , ΔS represents a sagittal image plane in d line , and distortion. In the aberration, the d line is displayed, and in the lateral chromatic aberration, the g line with respect to the d line is displayed.

レンズ断面図において矢印は広角端から望遠端へのズーミングに際しての各レンズ群と開口絞りの移動軌跡と無限遠物体から近距離物体へのフォーカシングをするときの移動方向を示している。尚、以下の各実施例において広角端と望遠端は変倍レンズ群が機構上光軸上移動可能な範囲の両端に位置したときのズーム位置をいう。   In the lens cross-sectional view, arrows indicate the movement trajectory of each lens group and aperture stop during zooming from the wide-angle end to the telephoto end, and the moving direction when focusing from an infinite object to a short-distance object. In each of the following embodiments, the wide-angle end and the telephoto end are zoom positions when the variable power lens unit is positioned at both ends of the range in which the zoom lens unit can be moved on the optical axis due to the mechanism.

各実施例では、広角端から望遠端へのズーミングに際して矢印のように、第１レンズ群Ｌ１は、像側へ移動した後に物体側に移動し、広角端に比べて望遠端において物体側に位置する。第２レンズ群Ｌ２は像側に移動する。第３レンズ群Ｌ３は物体側に移動する。第４レンズ群Ｌ４は像側に凸状の軌跡又は物体側へ移動する。また、第５レンズ群Ｌ５は物体側に凸状の軌跡で移動する。また、第４レンズ群Ｌ４によって変倍に伴う像面変動を補正している。各実施例において撮像素子はズーミングに際して不動であるが、像面に対して相対的に移動しても良い。   In each embodiment, as indicated by an arrow during zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves to the object side after moving to the image side, and is positioned closer to the object side at the telephoto end than at the wide-angle end. To do. The second lens unit L2 moves to the image side. The third lens unit L3 moves to the object side. The fourth lens unit L4 moves to the image side convex locus or the object side. The fifth lens unit L5 moves along a locus convex toward the object side. Further, the fourth lens unit L4 corrects image plane fluctuations accompanying zooming. In each embodiment, the image sensor does not move during zooming, but may move relative to the image plane.

実施例１乃至実施例４では、第４レンズ群Ｌ４を光軸上、移動させてフォーカシングを行うリアフォーカス式を採用している。第４レンズ群Ｌ４に関する実線の曲線４ａと点線の曲線４ｂは、各々無限遠物体と近距離物体にフォーカスしているときの変倍に伴う像面変動を補正するための移動軌跡である。また、望遠端において無限遠物体から近距離物体へフォーカスを行う場合には、矢印４ｃに示すように第４レンズ群Ｌ４を像側に繰り込むことで行っている。 In the first to fourth embodiments, a rear focus type is employed in which focusing is performed by moving the fourth lens unit L4 on the optical axis. A solid curve 4a and a dotted curve 4b relating to the fourth lens unit L4 are movement trajectories for correcting image plane fluctuations accompanying zooming when focusing on an object at infinity and an object at close distance, respectively. Further, when focusing from infinity to a close object at the telephoto end is performed in a way to push repeatedly the fourth lens unit L4 to the image side as shown by an arrow 4c.

実施例５では第５レンズ群Ｌ５を光軸上移動させてフォーカシングを行うリアフォーカス式を採用している。第５レンズ群Ｌ５に関する実線の曲線５ａと点線の曲線５ｂは各々無限遠物体と近距離物体にフォーカスしているときの変倍に伴う像面変動を補正するための移動軌跡である。望遠端において無限遠物体から近距離物体へフォーカスを行う場合には、矢印５ｃに示すように第５レンズ群Ｂ５を物体側へ繰り出すことで行っている。また、各実施例において、第４レンズ群Ｂ４は１つの負レンズ、第５レンズ群Ｂ５は１つの正レンズで構成している。 The fifth embodiment employs a rear focus type in which focusing is performed by moving the fifth lens unit L5 on the optical axis. A solid line curve 5a and a dotted line curve 5b relating to the fifth lens unit L5 are movement trajectories for correcting image plane variations caused by zooming when focusing on an object at infinity and an object at close distance, respectively. When focusing from an infinitely distant object to a close object at the telephoto end, the fifth lens unit B5 is extended to the object side as indicated by an arrow 5c. In each embodiment, the fourth lens unit B4 is composed of one negative lens, and the fifth lens unit B5 is composed of one positive lens.

各実施例は、全ズーム範囲にわたり高い光学性能を有し、全系が小型のズームレンズである。各実施例では、物体側より像側へ順に配置された、正の屈折力の第１レンズ群Ｌ１、負の屈折力の第２レンズ群Ｌ２、正の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５より構成して、高ズーム比化を図っている。また、第１レンズ群Ｌ１は、負レンズと負レンズの像側に配置された正レンズが接合された接合レンズより構成することにより、望遠端における軸上色収差を良好に補正している。 Each embodiment has high optical performance over the entire zoom range, and the entire system is a compact zoom lens. In each embodiment, the first lens unit L1 having a positive refractive power, the second lens unit L2 having a negative refractive power, the third lens unit L3 having a positive refractive power, which are arranged in order from the object side to the image side, are negative. The fourth lens unit L4 having the refracting power and the fifth lens unit L5 having the refracting power have a high zoom ratio. In addition, the first lens unit L1 is composed of a cemented lens in which a negative lens and a positive lens arranged on the image side of the negative lens are cemented, thereby correcting axial chromatic aberration at the telephoto end satisfactorily.

そして、第２レンズ群Ｌ２の焦点距離をｆ２、望遠端におけるバックフォーカスをＢＦｔ、広角端から望遠端へのズーミングにおける第１レンズ群Ｌ１と第２レンズ群Ｌ２の移動量を各々Ｍ１，Ｍ２とする。このとき、
２．９１≦｜ｆ２｜／Ｂｆｔ＜４．５０ ・・・（１）
−３．４８＜Ｍ１／Ｍ２＜−０．０１ ・・・（２）
なる条件式を満足している。 The focal length of the second lens unit L2 is f2, the back focus at the telephoto end is BFt, and the movement amounts of the first lens unit L1 and the second lens unit L2 during zooming from the wide-angle end to the telephoto end are M1, M2, respectively. To do. At this time,
2.91 ≦ | f2 | / Bft <4.50 (1)
−3.48 <M1 / M2 <−0.01 (2)
The following conditional expression is satisfied.

ここで広角端から望遠端へのズーミングにおけるレンズ群の移動量とは広角端と望遠端における光軸方向の位置の差をいう。移動量の符号は広角端に比べて望遠端においてレンズ群が像側に位置するときを正、物体側に位置するときを負とする。バックフォーカスＢＦｔは最終レンズ面から像面までの距離を空気換算長（ローパスフィルター等の光学ブロックのない状態での長さ）により表したものである。   Here, the amount of movement of the lens unit during zooming from the wide-angle end to the telephoto end refers to a difference in position in the optical axis direction between the wide-angle end and the telephoto end. The sign of the amount of movement is positive when the lens group is positioned on the image side at the telephoto end and negative when it is positioned on the object side, compared to the wide-angle end. The back focus BFt represents the distance from the final lens surface to the image plane by the air conversion length (the length without an optical block such as a low-pass filter).

次に各条件式の技術的意味について説明する。条件式（１）は第２レンズ群Ｌ２の焦点距離と望遠端におけるバックフォーカスの比を適切に設定している。条件式（１）の上限値を超えると、第２レンズ群Ｌ２の負の焦点距離が長く（絶対値が大きく）なりすぎてしまう。そのため、高ズーム比化を達成する為には、ズーミングに際して第２レンズ群Ｌ２の移動量が大きくなりすぎてしまい、前玉有効径が増大してくる。もしくは、望遠端におけるバックフォーカスが短くなりすぎてしまい、第５レンズ群Ｌ５と光学フィルター等の光学部材が干渉してくるので良くない。   Next, the technical meaning of each conditional expression will be described. Conditional expression (1) appropriately sets the ratio of the focal length of the second lens unit L2 to the back focus at the telephoto end. If the upper limit value of conditional expression (1) is exceeded, the negative focal length of the second lens unit L2 becomes too long (the absolute value becomes too large). Therefore, in order to achieve a high zoom ratio, the amount of movement of the second lens unit L2 becomes too large during zooming, and the front lens effective diameter increases. Alternatively, the back focus at the telephoto end becomes too short, and the fifth lens unit L5 and an optical member such as an optical filter interfere with each other.

また、条件式（１）の下限値を超えると、第２レンズ群Ｌ２の負の焦点距離が短く（絶対値が小さく）なりすぎてしまい、望遠端において倍率色収差、軸上色収差、球面収差等が増大し、これらの諸収差の補正が困難となる。もしくは、望遠端におけるバックフォーカスが長くなりすぎてしまい、望遠端におけるレンズ全長を短縮しつつ高ズーム比化を図ることが困難となる。   If the lower limit of conditional expression (1) is exceeded, the negative focal length of the second lens unit L2 becomes too short (the absolute value is too small), and lateral chromatic aberration, axial chromatic aberration, spherical aberration, etc. at the telephoto end. Increases, making it difficult to correct these various aberrations. Alternatively, the back focus at the telephoto end becomes too long, and it becomes difficult to achieve a high zoom ratio while shortening the total lens length at the telephoto end.

条件式（２）は広角端から望遠端へのズーミングにおける第１レンズ群Ｌ１と第２レンズ群Ｌ２の移動量の比を適切に設定している。条件式（２）の下限値を超えると、第１レンズ群Ｌ１の移動量の絶対値が第２レンズ群Ｌ２の移動量の絶対値に比べて大きくなりすぎてしまい、望遠端におけるレンズ全長を短縮しつつ高ズーム比化を図ることが困難となる。もしくは、第２レンズ群Ｌ２の移動量の絶対値が第１レンズ群Ｌ１の移動量の絶対値に比べて小さくなりすぎてしまい、所定のズーム比を確保するため第２レンズ群Ｌ２の屈折力を強くしなければならない。   Conditional expression (2) appropriately sets the ratio of the moving amounts of the first lens unit L1 and the second lens unit L2 during zooming from the wide-angle end to the telephoto end. When the lower limit value of conditional expression (2) is exceeded, the absolute value of the moving amount of the first lens unit L1 becomes too large compared to the absolute value of the moving amount of the second lens unit L2, and the total lens length at the telephoto end is increased. It becomes difficult to achieve a high zoom ratio while shortening. Alternatively, the absolute value of the moving amount of the second lens unit L2 becomes too small compared to the absolute value of the moving amount of the first lens unit L1, and the refractive power of the second lens unit L2 is ensured to ensure a predetermined zoom ratio. Must be strengthened.

この結果、望遠端において倍率色収差、軸上色収差、球面収差等が増大し、これらの諸収差の補正が困難となる。また、上限値を超えると、第１レンズ群Ｌ１の移動量の絶対値が第２レンズ群Ｌ２の移動量の絶対値に比べて小さくなりすぎてしまう。このため、高ズーム比化を達成するには、第１レンズ群Ｌ１の屈折力を強くせねばならず、この結果望遠端において軸上色収差および倍率色収差が増大し、これらの諸収差の補正が困難となる。   As a result, lateral chromatic aberration, axial chromatic aberration, spherical aberration, and the like increase at the telephoto end, making it difficult to correct these various aberrations. If the upper limit value is exceeded, the absolute value of the moving amount of the first lens unit L1 becomes too small compared to the absolute value of the moving amount of the second lens unit L2. Therefore, in order to achieve a high zoom ratio, the refractive power of the first lens unit L1 must be increased. As a result, axial chromatic aberration and lateral chromatic aberration increase at the telephoto end, and these various aberrations can be corrected. It becomes difficult.

もしくは、第２レンズ群Ｌ２の移動量の絶対値が第１レンズ群Ｌ１の移動量の絶対値に比べて大きくなりすぎてしまい、前玉有効径を縮小しつつ高ズーム比化を図ることが困難となる。更に好ましくは条件式（１），（２）の数値範囲を次の如く設定するのが良い。   Alternatively, the absolute value of the movement amount of the second lens unit L2 becomes too large compared to the absolute value of the movement amount of the first lens unit L1, and it is possible to achieve a high zoom ratio while reducing the effective diameter of the front lens. It becomes difficult. More preferably, the numerical ranges of conditional expressions (1) and (2) are set as follows.

２．９１≦｜ｆ２｜／Ｂｆｔ＜４．４０ ・・・（１ａ）
−３．２３＜Ｍ１／Ｍ２＜−０．０１ ・・・（２ａ）
更に好ましくは条件式（１ａ），（２ａ）の数値範囲を次の如く設定するのが良い。 2.91 ≦ | f2 | / Bft <4.40 (1a)
−3.23 <M1 / M2 <−0.01 (2a)
More preferably, the numerical ranges of conditional expressions (1a) and (2a) are set as follows.

２．９１≦｜ｆ２｜／Ｂｆｔ＜４．１０ ・・・（１ｂ）
−２．９８＜Ｍ１／Ｍ２＜−０．０２ ・・・（２ｂ）
以上のように構成することにより、各実施例により、高画角、高ズーム比でレンズ系全体が小型化で、望遠端のレンズ全長を抑制しながらも広角端から望遠端までの全ズーム域において色収差や像面湾曲などを良好に補正することができるズームレンズが得られる。 2.91 ≦ | f2 | / Bft <4.10 (1b)
-2.98 <M1 / M2 <−0.02 (2b)
By configuring as described above, each embodiment can reduce the entire lens system with a high angle of view and a high zoom ratio, and suppress the overall length of the lens at the telephoto end, while maintaining the entire zoom range from the wide-angle end to the telephoto end. Thus, a zoom lens capable of satisfactorily correcting chromatic aberration, curvature of field, and the like is obtained.

本発明のズームレンズは、以上のような構成を満足することにより実現されるが、高ズーム比及び小型化を維持しつつ更に光学性能を良好に維持するためには、以下の条件式のうち１つ以上を満足することが望ましい。第１レンズ群Ｌ１の焦点距離をｆ１とする。第３レンズ群Ｌ３と第５レンズ群Ｌ５の焦点距離を各々ｆ３，ｆ５とする。広角端から望遠端へのズーミングにおける第４レンズ群Ｌ４の移動量をＭ４とする。このとき、次の条件式のうち１つ以上を満足するのが良い。 The zoom lens according to the present invention is realized by satisfying the above-described configuration. In order to maintain a high zoom ratio and miniaturization and further maintain optical performance, the following conditional expression is satisfied. It is desirable to satisfy one or more. The focal length of the first lens unit L1 is f1. The focal lengths of the third lens unit L3 and the fifth lens unit L5 are f3 and f5, respectively. The amount of movement of the fourth lens unit L4 during zooming from the wide-angle end to the telephoto end is M4. At this time, one or more of the following conditional expressions should be satisfied.

７．４２＜ｆ５／Ｂｆｔ＜１３．２２ ・・・（３）
０．７３＜｜Ｍ４｜／Ｂｆｔ＜５．２４ ・・・（４）
０．１４＜ｆ３／ｆ５＜０．６８ ・・・（５）
３．２６＜ｆ１／｜ｆ２｜＜４．４７ ・・・（６）
次に前述した各条件式の技術的意味について説明する。 7.42 <f5 / Bft <13.22 (3)
0.73 <| M4 | / Bft <5.24 (4)
0.14 <f3 / f5 <0.68 (5)
3.26 <f1 / | f2 | <4.47 (6)
Next, the technical meaning of each conditional expression described above will be described.

条件式（３）は第５レンズ群Ｌ５の焦点距離と望遠端におけるバックフォーカスの比を適切に設定している。条件式（３）の上限値を超えると、第５レンズ群Ｌ５の焦点距離が長くなりすぎてしまい、第５レンズ群Ｌ５の変倍効果が小さくなる。この結果、望遠端におけるレンズ全長を短縮しつつ高ズーム比化を図ることが困難となる。もしくは望遠端におけるバックフォーカスが短くなりすぎてしまい、第５レンズ群Ｌ５と像面との間に光学フィルター等の光学部材を配置することが困難となる。   Conditional expression (3) appropriately sets the ratio of the focal length of the fifth lens unit L5 to the back focus at the telephoto end. When the upper limit value of conditional expression (3) is exceeded, the focal length of the fifth lens unit L5 becomes too long, and the zooming effect of the fifth lens unit L5 becomes small. As a result, it is difficult to achieve a high zoom ratio while shortening the overall lens length at the telephoto end. Alternatively, the back focus at the telephoto end becomes too short, and it becomes difficult to dispose an optical member such as an optical filter between the fifth lens unit L5 and the image plane.

また、下限値を超えると、第５レンズ群Ｌ５の焦点距離が短くなりすぎてしまい、広角端においてコマ収差及び倍率色収差等が増大し、これらの諸収差の補正が困難となる。もしくは望遠端におけるバックフォーカスが長くなりすぎてしまい、望遠端におけるレンズ全長を短縮しつつ、高ズーム比化を図ることが困難となる。   When the lower limit is exceeded, the focal length of the fifth lens unit L5 becomes too short, and coma aberration, lateral chromatic aberration, etc. increase at the wide angle end, making it difficult to correct these aberrations. Alternatively, the back focus at the telephoto end becomes too long, and it becomes difficult to achieve a high zoom ratio while shortening the total lens length at the telephoto end.

条件式（４）は広角端から望遠端へのズーミングにおける第４レンズ群Ｌ４の移動量と望遠端におけるバックフォーカスの比を適切に設定している。条件式（４）の上限値を超えると、第４レンズ群Ｌ４の移動量が大きくなりすぎてしまい、望遠端におけるレンズ全長を短縮しつつ高ズーム比化を図ることが困難となる。もしくは、望遠端におけるバックフォーカスが小さくなりすぎてしまい、第５レンズ群Ｌ５と像面との間に光学フィルターを配置することが困難となる。   Conditional expression (4) appropriately sets the ratio of the amount of movement of the fourth lens unit L4 during zooming from the wide-angle end to the telephoto end and the back focus at the telephoto end. When the upper limit of conditional expression (4) is exceeded, the amount of movement of the fourth lens unit L4 becomes too large, and it becomes difficult to achieve a high zoom ratio while shortening the total lens length at the telephoto end. Alternatively, the back focus at the telephoto end becomes too small, and it becomes difficult to dispose an optical filter between the fifth lens unit L5 and the image plane.

また、下限値を超えると、第４レンズ群Ｌ４の移動量が小さくなりすぎてしまう。そのため、高ズーム比化を達成するには、第４レンズ群Ｌ４の屈折力を強くせねばならず、この結果、広角端において非点収差が増大し、この収差補正が困難になる。もしくは、望遠端におけるバックフォーカスが長くなりすぎてしまい、望遠端におけるレンズ全長を短縮しつつ高ズーム比化を図ることが困難となる。   If the lower limit is exceeded, the amount of movement of the fourth lens unit L4 becomes too small. Therefore, in order to achieve a high zoom ratio, the refractive power of the fourth lens unit L4 must be increased. As a result, astigmatism increases at the wide-angle end, and this aberration correction becomes difficult. Alternatively, the back focus at the telephoto end becomes too long, and it becomes difficult to achieve a high zoom ratio while shortening the total lens length at the telephoto end.

条件式（５）は第３レンズ群Ｌ３の焦点距離と第５レンズ群Ｌ５の焦点距離との比を適切に設定している。条件式（５）上限値を超えると、第３レンズ群Ｌ３の焦点距離が長くなりすぎてしまい、望遠端におけるレンズ全長を短縮しつつ高ズーム比化を図ることが困難となる。もしくは、第５レンズ群Ｌ５の焦点距離が短くなりすぎてしまい、広角端においてコマ収差及び倍率色収差等が増大し、これらの諸収差を補正することが困難となる。   Conditional expression (5) appropriately sets the ratio between the focal length of the third lens unit L3 and the focal length of the fifth lens unit L5. When the upper limit of conditional expression (5) is exceeded, the focal length of the third lens unit L3 becomes too long, and it becomes difficult to achieve a high zoom ratio while shortening the total lens length at the telephoto end. Alternatively, the focal length of the fifth lens unit L5 becomes too short, and coma and lateral chromatic aberrations increase at the wide-angle end, making it difficult to correct these various aberrations.

また、下限値を超えると、第３レンズ群Ｌ３の焦点距離が短くなりすぎてしまい、広角端においてコマ収差及び球面収差が増大し、これらの諸収差を補正することが困難となる。もしくは、第５レンズ群Ｌ５の焦点距離が長くなりすぎてしまい、第５レンズ群Ｌ５の変倍効果が小さくなることから、望遠端におけるレンズ全長を短縮しつつ高ズーム比化を図ることが困難となる。   If the lower limit is exceeded, the focal length of the third lens unit L3 becomes too short, and coma and spherical aberration increase at the wide angle end, making it difficult to correct these various aberrations. Alternatively, since the focal length of the fifth lens unit L5 becomes too long and the zooming effect of the fifth lens unit L5 becomes small, it is difficult to achieve a high zoom ratio while shortening the total lens length at the telephoto end. It becomes.

条件式（６）は第１レンズ群Ｌ１の焦点距離と第２レンズ群Ｌ２の焦点距離の比を適切に設定している。条件式（６）の上限値を超えると第１レンズ群Ｌ１の焦点距離が長くなりすぎてしまい、望遠端におけるレンズ全長を短縮しつつ高ズーム比化を図ることが困難となる。もしくは第２レンズ群Ｌ２の焦点距離の絶対値が小さくなりすぎてしまい、望遠端におけるレンズ全長を短縮しつつ高ズーム比化を図ることが困難となる。   Conditional expression (6) appropriately sets the ratio of the focal length of the first lens unit L1 to the focal length of the second lens unit L2. If the upper limit of conditional expression (6) is exceeded, the focal length of the first lens unit L1 becomes too long, and it becomes difficult to achieve a high zoom ratio while shortening the total lens length at the telephoto end. Alternatively, the absolute value of the focal length of the second lens unit L2 becomes too small, and it becomes difficult to achieve a high zoom ratio while shortening the total lens length at the telephoto end.

また、下限値を超えると、第１レンズ群Ｌ１の焦点距離が短くなりすぎてしまい、望遠端において軸上色収差および倍率色収差が増大し、これらの諸収差の補正が困難となる。もしくは、第２レンズ群Ｌ２の焦点距離の絶対値が大きくなりすぎてしまい、前玉有効径を縮小しつつ高ズーム比化を図ることが困難となる。更に好ましくは、各条件式（３）乃至条件式（６）の数値範囲を次の如く設定するのが良い。   If the lower limit is exceeded, the focal length of the first lens unit L1 becomes too short, and axial chromatic aberration and lateral chromatic aberration increase at the telephoto end, making it difficult to correct these various aberrations. Alternatively, the absolute value of the focal length of the second lens unit L2 becomes too large, and it becomes difficult to achieve a high zoom ratio while reducing the effective diameter of the front lens. More preferably, the numerical ranges of the conditional expressions (3) to (6) are set as follows.

７．９２＜ｆ５／Ｂｆｔ＜１２．７２ ・・・（３ａ）
１．２３＜｜Ｍ４｜／Ｂｆｔ＜４．７４ ・・・（４ａ）
０．２４＜ｆ３／ｆ５＜０．５８ ・・・（５ａ）
３．３６＜ｆ１／｜ｆ２｜＜４．３７ ・・・（６ａ）
更に好ましくは、各条件式（３ａ）乃至条件式（６ａ）の数値範囲を次の如く設定するのが良い。 7.92 <f5 / Bft <12.72 (3a)
1.23 <| M4 | / Bft <4.74 (4a)
0.24 <f3 / f5 <0.58 (5a)
3.36 <f1 / | f2 | <4.37 (6a)
More preferably, the numerical ranges of the conditional expressions (3a) to (6a) are set as follows.

８．４２＜ｆ５／Ｂｆｔ＜１２．２２ ・・・（３ｂ）
１．７３＜｜Ｍ４｜／Ｂｆｔ＜４．７３ ・・・（４ｂ）
０．３４＜ｆ３／ｆ５＜０．４８ ・・・（５ｂ）
３．４６＜ｆ１／｜ｆ２｜＜４．２７ ・・・（６ｂ）
各実施例において好ましくは次の構成をとっても良い。 8.42 <f5 / Bft <12.22 (3b)
1.73 <| M4 | / Bft <4.73 (4b)
0.34 <f3 / f5 <0.48 (5b)
3.46 <f1 / | f2 | <4.27 (6b)
In each embodiment, the following configuration may be preferably employed.

広角端から望遠端へのズーミングに際して開口絞りＳＰを独立で移動するようにしても良い。広角端に比べ望遠端でレンズ全長が長くなるように第１レンズ群Ｌ１が移動してズーミングを行うのが良い。第３レンズ群Ｂ３全体、あるいはその一部を光軸に対して垂直方向の成分を持つように移動して像ぶれを補正するのが良い。各実施例のズームレンズを有する撮像装置において、諸収差のうち歪曲収差及び倍率色収差の補正を電気的な画像処理によって補正しても良い。   The aperture stop SP may be moved independently during zooming from the wide-angle end to the telephoto end. It is preferable to perform zooming by moving the first lens unit L1 so that the total lens length is longer at the telephoto end than at the wide-angle end. It is preferable to correct image blur by moving the entire third lens unit B3 or a part thereof so as to have a component perpendicular to the optical axis. In the imaging apparatus having the zoom lens of each embodiment, correction of distortion aberration and lateral chromatic aberration among various aberrations may be corrected by electrical image processing.

第３レンズ群Ｌ３に非球面を用いるのが良く、これによればズーム全域の球面収差を良好に補正することが容易になる。第２レンズ群Ｌ２を物体側より像側へ順に配置された、負レンズ、負レンズ、正レンズにより構成するのが収差補正上、好ましい。 It is preferable to use an aspherical surface for the third lens unit L3, which makes it easy to satisfactorily correct spherical aberration over the entire zoom range. It is preferable in terms of aberration correction that the second lens unit L2 is composed of a negative lens, a negative lens, and a positive lens arranged in order from the object side to the image side.

次に本発明のズームレンズを撮影光学系として用いたデジタルスチルカメラの実施例を図１１を用いて説明する。図１１において、１０はカメラ本体、１１は実施例１乃至５で説明したいずれか１つのズームレンズによって構成された撮影光学系である。１２はカメラ本体に内蔵され、撮影光学系１１によって形成された被写体像を受光するＣＣＤセンサやＣＭＯＳセンサ等の固体撮像素子（光電変換素子）である。 Next, an embodiment of a digital still camera using the zoom lens of the present invention as a photographing optical system will be described with reference to FIG. 11, the camera body 10, 11 is an imaging optical system constituted by any one of the zoom lenses described in Examples 1 to 5. Reference numeral 12 denotes a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the photographing optical system 11 and is built in the camera body.

１３は固体撮像素子１２によって光電変換された被写体像に対応する情報を記録するメモリである。１４は液晶ディスプレイパネル等によって構成され、固体撮像素子１２上に形成された被写体像を観察するためのファインダである。   Reference numeral 13 denotes a memory for recording information corresponding to the subject image photoelectrically converted by the solid-state imaging device 12. Reference numeral 14 denotes a finder for observing a subject image formed on the solid-state imaging device 12, which includes a liquid crystal display panel or the like.

本発明のズームレンズを撮影光学系として用いたビデオカメラ（撮像装置）にも同様に適用することができる。このように本発明のズームレンズをデジタルスチルカメラやビデオカメラ等の撮像装置に適用することにより、小型で高い光学性能を有する撮像装置を実現している。   The present invention can be similarly applied to a video camera (imaging device) using the zoom lens of the present invention as a photographing optical system. Thus, by applying the zoom lens of the present invention to an imaging apparatus such as a digital still camera or a video camera, an imaging apparatus having a small size and high optical performance is realized.

以下に本発明の各実施例に対応する数値実施例を示す。各数値実施例においてｉは物体側からの光学面の順序を示す。ｒｉは第ｉ番目の光学面の曲率半径、ｄｉは第ｉ番目の面間隔、ｎｄｉとνｄｉはそれぞれｄ線に対する第ｉ番目の光学部材の材料の屈折率とアッベ数を示す。バックフォーカス（ＢＦ）は、最終レンズ面から近軸像面までの空気換算での距離である。レンズ全長は、第１レンズ面から最終レンズ面までの距離にバックフォーカス（ＢＦ）を加えた値である。   Numerical examples corresponding to the respective embodiments of the present invention will be shown below. In each numerical example, i indicates the order of the optical surfaces from the object side. ri is the radius of curvature of the i-th optical surface, di is the i-th surface interval, and ndi and νdi are the refractive index and Abbe number of the material of the i-th optical member with respect to the d line, respectively. The back focus (BF) is a distance in terms of air from the final lens surface to the paraxial image surface. The total lens length is a value obtained by adding back focus (BF) to the distance from the first lens surface to the final lens surface.

数値実施例において最後の２つの面はフィルター、フェースプレート等の光学ブロックの面である。またＫを離心率、Ａ４、Ａ６、Ａ８、Ａ１０を非球面係数、光軸からの高さＨの位置での光軸方向の変位を面頂点を基準にしてｘとするとき、非球面形状は、   In the numerical example, the last two surfaces are surfaces of an optical block such as a filter and a face plate. Also, when K is the eccentricity, A4, A6, A8, and A10 are aspheric coefficients, and the displacement in the optical axis direction at the position of the height H from the optical axis is x with respect to the surface vertex, the aspheric shape is ,

で表示される。但しＲは曲率半径である。また例えば「ｅ−Ｚ」の表示は「１０−Ｚ」を意味する。また、各数値実施例における上述した条件式との対応を表１に示す。半画角は光線トレースにより求めた値である。非球面は面番号の後に＊を付加して示す。前述の各条件式と数値実施例における諸数値の関係を表１に示す。 Is displayed. Where R is the radius of curvature. Further, for example, the display of “e-Z” means “10 −Z ”. Table 1 shows the correspondence with the above-described conditional expressions in each numerical example. The half angle of view is a value obtained by ray tracing. An aspherical surface is indicated by adding * after the surface number. Table 1 shows the relationship between the above-described conditional expressions and various numerical values in the numerical examples.

数値実施例１
単位 mm

面データ
面番号 r d nd νd
1 31.978 0.85 1.92286 18.9
2 20.704 3.20 1.80400 46.6
3 -870.799 (可変)
4 -217.169 0.50 1.91082 35.3
5 12.086 3.75
6 -24.545 0.50 1.71300 53.9
7 47.606 0.10
8 26.447 2.05 1.95906 17.5
9 -280.339 (可変)
10(絞り) ∞ (可変)
11* 12.811 3.50 1.69350 53.2
12* -74.530 0.12
13 12.030 3.39 1.77250 49.6
14 44.846 0.40 2.00069 25.5
15 8.397 1.71
16 16.169 2.84 1.59282 68.6
17 -31.602 (可変)
18 19.988 0.56 1.71300 53.9
19 8.992 (可変)
20* 26.244 2.47 1.55332 71.7
21 -66.560 (可変)
22 ∞ 2.33 1.51633 64.1
23 ∞
Numerical example 1
Unit mm

Surface data surface number rd nd νd
1 31.978 0.85 1.92286 18.9
2 20.704 3.20 1.80 400 46.6
3 -870.799 (variable)
4 -217.169 0.50 1.91082 35.3
5 12.086 3.75
6 -24.545 0.50 1.71300 53.9
7 47.606 0.10
8 26.447 2.05 1.95906 17.5
9 -280.339 (variable)
10 (Aperture) ∞ (Variable)
11 * 12.811 3.50 1.69350 53.2
12 * -74.530 0.12
13 12.030 3.39 1.77250 49.6
14 44.846 0.40 2.00069 25.5
15 8.397 1.71
16 16.169 2.84 1.59282 68.6
17 -31.602 (variable)
18 19.988 0.56 1.71300 53.9
19 8.992 (variable)
20 * 26.244 2.47 1.55332 71.7
21 -66.560 (variable)
22 ∞ 2.33 1.51633 64.1
23 ∞

非球面データ
第11面
K =-1.11243e+000 A 4= 2.31962e-005 A 6= 2.24491e-007 A 8= 2.10389e-009

第12面
K = 0.00000e+000 A 4= 5.49747e-005 A 6= 9.78223e-008 A 8= 1.22053e-009

第20面
K = 0.00000e+000 A 4=-1.10245e-004

各種データ
ズーム比 4.75
広角 中間 望遠
焦点距離 9.14 11.71 43.42
Fナンバー 2.06 2.56 4.01
画角 35.76 33.03 10.35
像高 6.58 7.61 7.93
レンズ全長 62.53 57.16 63.11
BF 7.05 7.48 3.55

d 3 0.42 1.37 11.45
d 9 21.97 16.15 1.44
d10 1.24 -0.17 -0.10
d17 1.16 2.63 5.49
d19 3.98 2.99 14.57
d21 4.49 4.92 0.99

ズームレンズ群データ
群 始面 焦点距離
1 1 41.55
2 4 -11.96
3 11 13.25
4 18 -23.42
5 20 34.34
Aspheric data 11th surface
K = -1.11243e + 000 A 4 = 2.31962e-005 A 6 = 2.24491e-007 A 8 = 2.10389e-009

12th page
K = 0.00000e + 000 A 4 = 5.49747e-005 A 6 = 9.78223e-008 A 8 = 1.22053e-009

20th page
K = 0.00000e + 000 A 4 = -1.10245e-004

Various data Zoom ratio 4.75
Wide angle Medium Telephoto focal length 9.14 11.71 43.42
F number 2.06 2.56 4.01
Angle of view 35.76 33.03 10.35
Image height 6.58 7.61 7.93
Total lens length 62.53 57.16 63.11
BF 7.05 7.48 3.55

d 3 0.42 1.37 11.45
d 9 21.97 16.15 1.44
d10 1.24 -0.17 -0.10
d17 1.16 2.63 5.49
d19 3.98 2.99 14.57
d21 4.49 4.92 0.99

Zoom lens group data group Start surface Focal length
1 1 41.55
2 4 -11.96
3 11 13.25
4 18 -23.42
5 20 34.34

数値実施例２
単位 mm

面データ
面番号 r d nd νd
1 50.691 1.26 1.92286 18.9
2 30.738 5.57 1.79433 41.8
3 -682.314 (可変)
4 -170.757 0.55 1.88202 37.2
5* 15.773 6.88
6 -52.183 0.89 1.71899 55.2
7 48.289 0.10
8 35.593 3.93 1.95906 17.5
9 2372.508 (可変)
10(絞り) ∞ (可変)
11* 24.915 7.13 1.76401 42.9
12* -76.731 0.10
13 16.458 4.15 1.68873 57.0
14 68.176 0.55 2.00069 25.5
15 13.299 6.73
16* 33.570 4.65 1.55323 70.5
17* -34.400 (可変)
18 56.802 2.70 1.85135 40.1
19* 21.645 (可変)
20* 24.592 6.43 1.49721 81.5
21 100.051 (可変)
22 ∞ 1.55 1.51633 64.1
23 ∞
Numerical example 2
Unit mm

Surface data surface number rd nd νd
1 50.691 1.26 1.92286 18.9
2 30.738 5.57 1.79433 41.8
3 -682.314 (variable)
4 -170.757 0.55 1.88202 37.2
5 * 15.773 6.88
6 -52.183 0.89 1.71899 55.2
7 48.289 0.10
8 35.593 3.93 1.95906 17.5
9 2372.508 (variable)
10 (Aperture) ∞ (Variable)
11 * 24.915 7.13 1.76401 42.9
12 * -76.731 0.10
13 16.458 4.15 1.68873 57.0
14 68.176 0.55 2.00069 25.5
15 13.299 6.73
16 * 33.570 4.65 1.55323 70.5
17 * -34.400 (variable)
18 56.802 2.70 1.85135 40.1
19 * 21.645 (variable)
20 * 24.592 6.43 1.49721 81.5
21 100.051 (variable)
22 ∞ 1.55 1.51633 64.1
23 ∞

非球面データ
第5面
K = 1.01663e-001 A 4=-8.90871e-006 A 6=-3.62998e-008 A 8= 3.60633e-011
A10=-2.47133e-012

第11面
K =-2.25259e+000 A 4= 1.30820e-005 A 6=-1.92111e-008 A 8= 5.54476e-011

第12面
K = 0.00000e+000 A 4= 1.43383e-005 A 6=-3.69823e-008 A 8= 1.21866e-010

第16面
K =-1.14532e+001 A 4= 4.80810e-005 A 6=-2.50269e-007 A 8= 3.89319e-010

第17面
K = 0.00000e+000 A 4=-1.04118e-005 A 6=-5.00545e-008 A 8=-3.99784e-010

第19面
K =-5.53042e+000 A 4= 9.63905e-005 A 6=-2.03260e-007 A 8= 5.85035e-010
A10=-4.82348e-013

第20面
K =-6.55201e+000 A 4= 5.80662e-005 A 6=-1.13098e-007 A 8= 1.96797e-010

各種データ
ズーム比 5.50
広角 中間 望遠
焦点距離 13.09 17.34 72.02
Fナンバー 2.06 2.56 4.01
画角 36.36 31.07 9.27
像高 9.63 10.45 11.75
レンズ全長 106.31 100.60 121.28
BF 10.11 13.26 5.42

d 3 0.86 1.91 20.87
d 9 35.36 24.60 2.83
d10 -0.10 -0.10 0.20
d17 1.48 2.43 11.35
d19 6.47 6.37 28.47
d21 5.78 8.93 1.09

ズームレンズ群データ
群 始面 焦点距離
1 1 65.90
2 4 -15.75
3 11 23.51
4 18 -42.58
5 20 63.77
Aspheric data 5th surface
K = 1.01663e-001 A 4 = -8.90871e-006 A 6 = -3.62998e-008 A 8 = 3.60633e-011
A10 = -2.47133e-012

11th page
K = -2.25259e + 000 A 4 = 1.30820e-005 A 6 = -1.92111e-008 A 8 = 5.54476e-011

12th page
K = 0.00000e + 000 A 4 = 1.43383e-005 A 6 = -3.69823e-008 A 8 = 1.21866e-010

16th page
K = -1.14532e + 001 A 4 = 4.80810e-005 A 6 = -2.50269e-007 A 8 = 3.89319e-010

17th page
K = 0.00000e + 000 A 4 = -1.04118e-005 A 6 = -5.00545e-008 A 8 = -3.99784e-010

19th page
K = -5.53042e + 000 A 4 = 9.63905e-005 A 6 = -2.03260e-007 A 8 = 5.85035e-010
A10 = -4.82348e-013

20th page
K = -6.55201e + 000 A 4 = 5.80662e-005 A 6 = -1.13098e-007 A 8 = 1.96797e-010

Various data Zoom ratio 5.50
Wide angle Medium Telephoto focal length 13.09 17.34 72.02
F number 2.06 2.56 4.01
Angle of view 36.36 31.07 9.27
Image height 9.63 10.45 11.75
Total lens length 106.31 100.60 121.28
BF 10.11 13.26 5.42

d 3 0.86 1.91 20.87
d 9 35.36 24.60 2.83
d10 -0.10 -0.10 0.20
d17 1.48 2.43 11.35
d19 6.47 6.37 28.47
d21 5.78 8.93 1.09

Zoom lens group data group Start surface Focal length
1 1 65.90
2 4 -15.75
3 11 23.51
4 18 -42.58
5 20 63.77

数値実施例３
単位 mm

面データ
面番号 r d nd νd
1 50.710 1.26 1.92286 18.9
2 30.738 5.83 1.79411 42.0
3 -822.630 (可変)
4 -213.531 0.55 1.88202 37.2
5* 15.476 6.90
6 -52.433 0.92 1.71764 53.0
7 48.187 0.11
8 35.722 4.00 1.95906 17.5
9 35758.634 (可変)
10(絞り) ∞ (可変)
11* 24.963 7.03 1.76440 43.3
12* -74.455 0.26
13 16.523 4.16 1.68916 57.0
14 67.391 0.56 2.00069 25.5
15 13.300 5.49
16* 33.874 4.49 1.55359 70.4
17* -33.927 (可変)
18 58.267 2.71 1.85135 40.1
19* 21.760 (可変)
20* 30.404 6.05 1.49700 81.5
21 471.830 (可変)
22 ∞ 1.55 1.51633 64.1
23 ∞
Numerical Example 3
Unit mm

Surface data surface number rd nd νd
1 50.710 1.26 1.92286 18.9
2 30.738 5.83 1.79411 42.0
3 -822.630 (variable)
4 -213.531 0.55 1.88202 37.2
5 * 15.476 6.90
6 -52.433 0.92 1.71764 53.0
7 48.187 0.11
8 35.722 4.00 1.95906 17.5
9 35758.634 (variable)
10 (Aperture) ∞ (Variable)
11 * 24.963 7.03 1.76440 43.3
12 * -74.455 0.26
13 16.523 4.16 1.68916 57.0
14 67.391 0.56 2.00069 25.5
15 13.300 5.49
16 * 33.874 4.49 1.55359 70.4
17 * -33.927 (variable)
18 58.267 2.71 1.85135 40.1
19 * 21.760 (variable)
20 * 30.404 6.05 1.49700 81.5
21 471.830 (variable)
22 ∞ 1.55 1.51633 64.1
23 ∞

非球面データ
第5面
K =-3.67634e-002 A 4=-4.32234e-006 A 6=-2.07152e-008 A 8= 1.11729e-010
A10=-1.85422e-012

第11面
K =-2.32423e+000 A 4= 1.28787e-005 A 6=-1.91259e-008 A 8= 8.66195e-011

第12面
K = 0.00000e+000 A 4= 1.50250e-005 A 6=-3.97389e-008 A 8= 1.91157e-010

第16面
K =-1.24766e+001 A 4= 5.34207e-005 A 6=-3.24934e-007 A 8= 7.59893e-010

第17面
K = 0.00000e+000 A 4=-1.45116e-005 A 6=-7.48482e-008 A 8=-4.14353e-010

第19面
K =-5.40989e+000 A 4= 1.01997e-004 A 6=-1.65022e-007 A 8= 5.70819e-011
A10= 1.59333e-012

第20面
K =-1.20357e+001 A 4= 6.15523e-005 A 6=-1.46899e-007 A 8= 2.75919e-010

各種データ
ズーム比 5.57
広角 中間 望遠
焦点距離 12.74 17.34 70.92
Fナンバー 2.06 2.56 4.01
画角 37.10 31.06 9.41
像高 9.63 10.45 11.75
レンズ全長 106.14 99.99 118.24
BF 10.10 13.38 4.80

d 3 0.62 2.00 20.75
d 9 36.00 24.76 2.85
d10 0.45 -0.03 0.23
d17 1.50 2.42 11.34
d19 6.61 6.60 27.41
d21 5.77 9.05 0.47

ズームレンズ群データ
群 始面 焦点距離
1 1 66.80
2 4 -15.91
3 11 22.79
4 18 -42.23
5 20 65.09
Aspheric data 5th surface
K = -3.67634e-002 A 4 = -4.32234e-006 A 6 = -2.07152e-008 A 8 = 1.11729e-010
A10 = -1.85422e-012

11th page
K = -2.32423e + 000 A 4 = 1.28787e-005 A 6 = -1.91259e-008 A 8 = 8.66195e-011

12th page
K = 0.00000e + 000 A 4 = 1.50250e-005 A 6 = -3.97389e-008 A 8 = 1.91157e-010

16th page
K = -1.24766e + 001 A 4 = 5.34207e-005 A 6 = -3.24934e-007 A 8 = 7.59893e-010

17th page
K = 0.00000e + 000 A 4 = -1.45116e-005 A 6 = -7.48482e-008 A 8 = -4.14353e-010

19th page
K = -5.40989e + 000 A 4 = 1.01997e-004 A 6 = -1.65022e-007 A 8 = 5.70819e-011
A10 = 1.59333e-012

20th page
K = -1.20357e + 001 A 4 = 6.15523e-005 A 6 = -1.46899e-007 A 8 = 2.75919e-010

Various data Zoom ratio 5.57
Wide angle Medium telephoto focal length 12.74 17.34 70.92
F number 2.06 2.56 4.01
Angle of view 37.10 31.06 9.41
Image height 9.63 10.45 11.75
Total lens length 106.14 99.99 118.24
BF 10.10 13.38 4.80

d 3 0.62 2.00 20.75
d 9 36.00 24.76 2.85
d10 0.45 -0.03 0.23
d17 1.50 2.42 11.34
d19 6.61 6.60 27.41
d21 5.77 9.05 0.47

Zoom lens group data group Start surface Focal length
1 1 66.80
2 4 -15.91
3 11 22.79
4 18 -42.23
5 20 65.09

数値実施例４
単位 mm

面データ
面番号 r d nd νd
1 51.953 1.26 1.92286 18.9
2 30.738 6.62 1.78581 36.7
3 1022.044 (可変)
4 -214.301 0.55 1.88202 37.2
5* 16.629 6.76
6 -34.442 1.41 1.68934 32.8
7 62.456 0.29
8 55.343 4.00 1.95906 17.5
9 -73.249 (可変)
10(絞り) ∞ (可変)
11* 21.874 6.00 1.75954 48.4
12* -125.100 0.94
13 16.558 4.30 1.68538 57.3
14 70.760 0.81 2.00069 25.5
15 12.980 4.00
16* 27.751 4.00 1.54803 59.2
17* -32.624 (可変)
18 -53.535 2.00 1.82240 40.0
19* 46.748 (可変)
20* 34.272 5.00 1.65617 59.3
21 -210.584 (可変)
22 ∞ 1.55 1.51633 64.1
23 ∞
Numerical Example 4
Unit mm

Surface data surface number rd nd νd
1 51.953 1.26 1.92286 18.9
2 30.738 6.62 1.78581 36.7
3 1022.044 (variable)
4 -214.301 0.55 1.88202 37.2
5 * 16.629 6.76
6 -34.442 1.41 1.68934 32.8
7 62.456 0.29
8 55.343 4.00 1.95906 17.5
9 -73.249 (variable)
10 (Aperture) ∞ (Variable)
11 * 21.874 6.00 1.75954 48.4
12 * -125.100 0.94
13 16.558 4.30 1.68538 57.3
14 70.760 0.81 2.00069 25.5
15 12.980 4.00
16 * 27.751 4.00 1.54803 59.2
17 * -32.624 (variable)
18 -53.535 2.00 1.82240 40.0
19 * 46.748 (variable)
20 * 34.272 5.00 1.65617 59.3
21 -210.584 (variable)
22 ∞ 1.55 1.51633 64.1
23 ∞

非球面データ
第5面
K = 3.54260e-001 A 4=-1.49830e-005 A 6=-1.12963e-007 A 8= 5.30473e-010
A10=-5.46681e-012

第11面
K =-1.46963e+000 A 4= 1.40726e-005 A 6=-4.72523e-009 A 8= 4.57564e-013
第12面
K = 0.00000e+000 A 4= 1.55904e-005 A 6=-3.44819e-008 A 8= 3.05720e-011

第16面
K =-1.21707e+000 A 4= 3.10664e-005 A 6=-4.16467e-008 A 8=-2.80985e-010

第17面
K = 0.00000e+000 A 4= 1.03627e-005 A 6= 3.54066e-008 A 8=-4.05187e-010

第19面
K = 0.00000e+000 A 4= 3.07550e-005 A 6= 4.12635e-008 A 8=-8.18318e-010
A10= 3.34498e-012

第20面
K =-1.23417e+001 A 4= 3.35917e-005 A 6=-7.57630e-008 A 8= 1.09525e-010

各種データ
ズーム比 4.83
広角 中間 望遠
焦点距離 13.43 17.34 64.87
Fナンバー 2.06 2.56 4.01
画角 35.66 31.07 10.27
像高 9.63 10.45 11.75
レンズ全長 103.58 99.76 114.49
BF 11.93 13.89 4.63

d 3 0.79 3.50 15.43
d 9 35.45 25.91 2.73
d10 -0.10 -0.10 0.11
d17 2.03 2.42 8.97
d19 4.99 5.65 34.14
d21 7.60 9.56 0.30

ズームレンズ群データ
群 始面 焦点距離
1 1 79.15
2 4 -18.59
3 11 21.46
4 18 -30.07
5 20 45.29
Aspheric data 5th surface
K = 3.54260e-001 A 4 = -1.49830e-005 A 6 = -1.12963e-007 A 8 = 5.30473e-010
A10 = -5.46681e-012

11th page
K = -1.46963e + 000 A 4 = 1.40726e-005 A 6 = -4.72523e-009 A 8 = 4.57564e-013
12th page
K = 0.00000e + 000 A 4 = 1.55904e-005 A 6 = -3.44819e-008 A 8 = 3.05720e-011

16th page
K = -1.21707e + 000 A 4 = 3.10664e-005 A 6 = -4.16467e-008 A 8 = -2.80985e-010

17th page
K = 0.00000e + 000 A 4 = 1.03627e-005 A 6 = 3.54066e-008 A 8 = -4.05187e-010

19th page
K = 0.00000e + 000 A 4 = 3.07550e-005 A 6 = 4.12635e-008 A 8 = -8.18318e-010
A10 = 3.34498e-012

20th page
K = -1.23417e + 001 A 4 = 3.35917e-005 A 6 = -7.57630e-008 A 8 = 1.09525e-010

Various data Zoom ratio 4.83
Wide angle Medium Telephoto focal length 13.43 17.34 64.87
F number 2.06 2.56 4.01
Angle of view 35.66 31.07 10.27
Image height 9.63 10.45 11.75
Total lens length 103.58 99.76 114.49
BF 11.93 13.89 4.63

d 3 0.79 3.50 15.43
d 9 35.45 25.91 2.73
d10 -0.10 -0.10 0.11
d17 2.03 2.42 8.97
d19 4.99 5.65 34.14
d21 7.60 9.56 0.30

Zoom lens group data group Start surface Focal length
1 1 79.15
2 4 -18.59
3 11 21.46
4 18 -30.07
5 20 45.29

数値実施例５
単位 mm

面データ
面番号 r d nd νd
1 52.171 1.26 1.92286 18.9
2 30.738 6.09 1.78431 38.6
3 4804.354 (可変)
4 -198.020 0.55 1.88202 37.2
5* 16.596 7.15
6 -35.602 1.49 1.69221 32.4
7 60.995 0.27
8 51.815 4.00 1.95906 17.5
9 -87.301 (可変)
10(絞り) ∞ (可変)
11* 23.030 6.00 1.76007 48.3
12* -81.537 1.26
13 17.206 4.30 1.69004 57.0
14 68.069 0.83 2.00069 25.5
15 13.115 4.00
16* 29.840 4.00 1.55460 58.0
17* -25.930 (可変)
18 -71.666 2.00 1.82811 39.5
19* 29.756 (可変)
20* 27.273 5.00 1.49927 81.0
21 -248.453 (可変)
22 ∞ 1.55 1.51633 64.1
23 ∞
Numerical Example 5
Unit mm

Surface data surface number rd nd νd
1 52.171 1.26 1.92286 18.9
2 30.738 6.09 1.78431 38.6
3 4804.354 (variable)
4 -198.020 0.55 1.88202 37.2
5 * 16.596 7.15
6 -35.602 1.49 1.69221 32.4
7 60.995 0.27
8 51.815 4.00 1.95906 17.5
9 -87.301 (variable)
10 (Aperture) ∞ (Variable)
11 * 23.030 6.00 1.76007 48.3
12 * -81.537 1.26
13 17.206 4.30 1.69004 57.0
14 68.069 0.83 2.00069 25.5
15 13.115 4.00
16 * 29.840 4.00 1.55460 58.0
17 * -25.930 (variable)
18 -71.666 2.00 1.82811 39.5
19 * 29.756 (variable)
20 * 27.273 5.00 1.49927 81.0
21 -248.453 (variable)
22 ∞ 1.55 1.51633 64.1
23 ∞

非球面データ
第5面
K = 2.05789e-001 A 4=-1.00333e-005 A 6=-6.09277e-008 A 8= 1.98618e-010
A10=-2.77829e-012

第11面
K =-1.80407e+000 A 4= 1.12130e-005 A 6=-1.60650e-008 A 8= 4.73307e-011

第12面
K = 0.00000e+000 A 4= 1.43492e-005 A 6=-3.59901e-008 A 8= 1.27081e-010

第16面
K =-1.51472e+000 A 4= 1.83016e-005 A 6=-6.03381e-008 A 8=-1.35372e-009

第17面
K = 0.00000e+000 A 4=-1.51853e-006 A 6= 1.34916e-008 A 8=-2.17558e-009

第19面
K = 0.00000e+000 A 4= 3.43284e-005 A 6=-1.27902e-008 A 8=-2.45410e-010
A10= 2.40405e-012

第20面
K = 0.00000e+000 A 4= 2.40885e-006 A 6= 2.50659e-008 A 8=-3.12434e-011

各種データ
ズーム比 4.59
広角 中間 望遠
焦点距離 13.43 17.34 61.62
Fナンバー 2.06 2.56 4.01
画角 35.66 31.07 10.80
像高 9.63 10.45 11.75
レンズ全長 104.82 99.14 110.66
BF 10.72 13.32 4.46

d 3 1.16 2.70 18.72
d 9 36.67 26.28 2.92
d10 -0.10 -0.10 0.30
d17 2.14 2.51 8.29
d19 5.51 5.71 27.25
d21 7.69 10.29 1.43

ズームレンズ群データ
群 始面 焦点距離
1 1 76.45
2 4 -17.96
3 11 20.70
4 18 -25.17
5 20 49.52
Aspheric data 5th surface
K = 2.05789e-001 A 4 = -1.00333e-005 A 6 = -6.09277e-008 A 8 = 1.98618e-010
A10 = -2.77829e-012

11th page
K = -1.80407e + 000 A 4 = 1.12130e-005 A 6 = -1.60650e-008 A 8 = 4.73307e-011

12th page
K = 0.00000e + 000 A 4 = 1.43492e-005 A 6 = -3.59901e-008 A 8 = 1.27081e-010

16th page
K = -1.51472e + 000 A 4 = 1.83016e-005 A 6 = -6.03381e-008 A 8 = -1.35372e-009

17th page
K = 0.00000e + 000 A 4 = -1.51853e-006 A 6 = 1.34916e-008 A 8 = -2.17558e-009

19th page
K = 0.00000e + 000 A 4 = 3.43284e-005 A 6 = -1.27902e-008 A 8 = -2.45410e-010
A10 = 2.40405e-012

20th page
K = 0.00000e + 000 A 4 = 2.40885e-006 A 6 = 2.50659e-008 A 8 = -3.12434e-011

Various data Zoom ratio 4.59
Wide angle Medium Telephoto focal length 13.43 17.34 61.62
F number 2.06 2.56 4.01
Angle of view 35.66 31.07 10.80
Image height 9.63 10.45 11.75
Total lens length 104.82 99.14 110.66
BF 10.72 13.32 4.46

d 3 1.16 2.70 18.72
d 9 36.67 26.28 2.92
d10 -0.10 -0.10 0.30
d17 2.14 2.51 8.29
d19 5.51 5.71 27.25
d21 7.69 10.29 1.43

Zoom lens group data group Start surface Focal length
1 1 76.45
2 4 -17.96
3 11 20.70
4 18 -25.17
5 20 49.52

Ｂ１： 第１レンズ群 Ｂ２： 第２レンズ群 Ｂ３： 第３レンズ群
Ｂ４： 第４レンズ群 Ｂ５： 第５レンズ群 B1: First lens group B2: Second lens group B3: Third lens group B4: Fourth lens group B5: Fifth lens group

Claims (5)

物体側より像側へ順に配置された、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、負の屈折力の第４レンズ群、正の屈折力の第５レンズ群からなり、ズーミングに際して隣り合うレンズ群の間隔が変化するズームレンズであって、
前記第１レンズ群は、負レンズと該負レンズの像側に配置された正レンズが接合された接合レンズからなり、前記第２レンズ群の焦点距離をｆ２、望遠端におけるバックフォーカスをＢＦｔ、広角端から望遠端へのズーミングにおける前記第１レンズ群と前記第２レンズ群の移動量を各々Ｍ１，Ｍ２、前記第１レンズ群の焦点距離をｆ１とするとき、
２．９１≦｜ｆ２｜／Ｂｆｔ＜４．５０
−３．４８＜Ｍ１／Ｍ２＜−０．０１
３．２６＜ｆ１／｜ｆ２｜＜４．４７
なる条件式を満足することを特徴とするズームレンズ。 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 fourth lens group having a negative refractive power, which are arranged in order from the object side to the image side. A zoom lens comprising a fifth lens unit having a positive refractive power, wherein the interval between adjacent lens units changes during zooming,
The first lens group includes a cemented lens in which a negative lens and a positive lens arranged on the image side of the negative lens are cemented, the focal length of the second lens group is f2, the back focus at the telephoto end is BFt, When the movement amounts of the first lens group and the second lens group in zooming from the wide-angle end to the telephoto end are M1 and M2 , respectively, and the focal length of the first lens group is f1 ,
2.91 ≦ | f2 | / Bft <4.50
−3.48 <M1 / M2 <−0.01
3.26 <f1 / | f2 | <4.47
A zoom lens satisfying the following conditional expression: 前記第５レンズ群の焦点距離をｆ５とするとき、
７．４２＜ｆ５／Ｂｆｔ＜１３．２２
なる条件式を満足することを特徴とする請求項１に記載のズームレンズ。 When the focal length of the fifth lens group is f5,
7.42 <f5 / Bft <13.22
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. 広角端から望遠端へのズーミングにおける前記第４レンズ群の移動量をＭ４とするとき、
０．７３＜｜Ｍ４｜／Ｂｆｔ＜５．２４
なる条件式を満足することを特徴とする請求項１または２に記載のズームレンズ。 When the amount of movement of the fourth lens group in zooming from the wide-angle end to the telephoto end is M4,
0.73 <| M4 | / Bft <5.24
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. 前記第３レンズ群と前記第５レンズ群の焦点距離を各々ｆ３，ｆ５とするとき、
０．１４＜ｆ３／ｆ５＜０．６８
なる条件式を満足することを特徴とする請求項１乃至３のいずれか１項に記載のズームレンズ。 When the focal lengths of the third lens group and the fifth lens group are f3 and f5, respectively.
0.14 <f3 / f5 <0.68
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. 請求項１乃至４のいずれか１項に記載のズームレンズと、該ズームレンズによって形成された像を受光する撮像素子を有することを特徴とする撮像装置。 A zoom lens according to any one of claims 1 to 4, the image pickup apparatus characterized by having an image pickup device which receives an image formed by the zoom lens.
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