JP6436626B2 - Zoom lens and imaging apparatus having the same - Google Patents

Zoom lens and imaging apparatus having the same Download PDF

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JP6436626B2
JP6436626B2 JP2013259763A JP2013259763A JP6436626B2 JP 6436626 B2 JP6436626 B2 JP 6436626B2 JP 2013259763 A JP2013259763 A JP 2013259763A JP 2013259763 A JP2013259763 A JP 2013259763A JP 6436626 B2 JP6436626 B2 JP 6436626B2
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慎一郎 齋藤
慎一郎 齋藤
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Canon Inc
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Description

本発明はズームレンズ及びそれを有する撮像装置に関し、特にスチルカメラ、ビデオカメラ、デジタルスチルカメラ、ＴＶカメラ、そして監視用カメラ等の撮像装置に好適なものである。   The present invention relates to a zoom lens and an image pickup apparatus having the same, and is particularly suitable for an image pickup apparatus such as a still camera, a video camera, a digital still camera, a TV camera, and a surveillance camera.

近年、固体撮像素子を用いた撮像装置は高機能化され、また、装置全体が小型化されている。そしてそれに用いる撮影レンズ（撮影光学系）としては、レンズ全長が短く、全系が小型でしかも広範囲の焦点距離域を含む高ズーム比のズームレンズであることが要求されている。更に無限遠物体から近距離物体に至る全物体距離にわたり高い光学性能を有す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. A photographing lens (photographing optical system) used therefor is required to be a high zoom ratio zoom lens having a short overall lens length, a small overall system, and a wide focal length range. Furthermore, it is required to have high optical performance over the entire object distance from an infinitely distant object to a close object.

高ズーム比化が容易なズームレンズとして最も物体側のレンズ群が正の屈折力のレンズ群より成るポジティブリードタイプのズームレンズが知られている。また光学系全体の小型化が容易なズームレンズとして、物体側から数えて第２レンズ群以降のレンズ群を光軸方向に移動させてフォーカシングする所謂インナーフォーカス方式又はリアフォーカス方式を用いたズームレンズが知られている。   As a zoom lens that can easily achieve a high zoom ratio, a positive lead type zoom lens is known in which the lens unit closest to the object side is a lens unit having a positive refractive power. Further, as a zoom lens in which the entire optical system can be easily reduced in size, a zoom lens using a so-called inner focus method or rear focus method in which the second lens unit and subsequent lens units are moved from the object side in the optical axis direction for focusing. It has been known.

従来、ポジティブリードタイプでリアフォーカス方式を用い、全系が小型で高ズーム比のズームレンズが知られている（特許文献１乃至３）。特許文献１は物体側より像側へ順に、正，負，正，負，正，正の屈折力の第１レンズ群乃至第６レンズ群よりなり、各レンズ群を移動させてズーミングを行い、第３レンズ群又は第４レンズ群を移動させてフォーカシングを行うズームレンズを開示している。   2. Description of the Related Art Conventionally, zoom lenses having a positive lead type, rear focus method, a small entire system, and a high zoom ratio are known (Patent Documents 1 to 3). Patent Document 1 includes first to sixth lens groups having positive, negative, positive, negative, positive, and positive refractive power in order from the object side to the image side, and performs zooming by moving each lens group. A zoom lens that performs focusing by moving the third lens group or the fourth lens group is disclosed.

特許文献２は、物体側より像側へ順に正、負、正、負、正、負の屈折力の第１〜第６レンズ群より成り、各レンズ群を移動させてズーミングを行い、第６レンズ群を移動させてフォーカシングを行ったズームレンズを開示している。特許文献３は物体側から像側へ順に、正，負，正，負，正，負，正の屈折力のレンズ群より成り、隣り合うレンズ群の間隔を変えてズーミングを行い、第６レンズ群を移動させてフォーカシングを行うズームレンズを開示している。   Patent Document 2 includes first to sixth lens groups having positive, negative, positive, negative, positive, and negative refractive powers in order from the object side to the image side, and performs zooming by moving each lens group. A zoom lens in which focusing is performed by moving a lens group is disclosed. Patent Document 3 is composed of lens groups having positive, negative, positive, negative, positive, negative, and positive refractive power in order from the object side to the image side, and performs zooming by changing the interval between adjacent lens groups. A zoom lens that performs focusing by moving a group is disclosed.

特開２０１３−８０１５３号公報JP 2013-80153 A 特開平０４−１８６２１２号公報Japanese Patent Laid-Open No. 04-186212 特開２００４−３１７８６７号公報JP 2004-317867 A

近年、撮像装置に用いるズームレンズには、広画角、高ズーム比で、かつレンズ系全体が小型で、色収差等の諸収差を良好に補正した高い光学性能を有するズームレンズが強く要望されている。   In recent years, there has been a strong demand for zoom lenses used in image pickup apparatuses that have a wide angle of view, a high zoom ratio, a compact lens system, and high optical performance in which various aberrations such as chromatic aberration are well corrected. Yes.

一般にズームレンズにおいて、所定のズーム比を確保しつつ、全系の小型化を図るためには、ズームレンズを構成する各レンズ群の屈折力を強めつつ、レンズ枚数を削減すれば良い。しかしながら、このように構成したズームレンズは、各レンズ面の屈折力の増加に伴いレンズ肉厚が増してしまい、全系の短縮効果が不十分になると同時に諸収差の発生が多くなってくる。   In general, in a zoom lens, in order to reduce the size of the entire system while ensuring a predetermined zoom ratio, the number of lenses may be reduced while increasing the refractive power of each lens group constituting the zoom lens. However, the zoom lens constructed as described above increases the lens thickness as the refractive power of each lens surface increases, and the shortening effect of the entire system becomes insufficient and various aberrations increase.

ポジティブリード型のズームレンズにおいて、全系の小型化と、高ズーム比を確保しつつ高い光学性能を得るには、ズームレンズを構成する各要素を適切に設定することが重要となってくる。例えばズームタイプ（レンズ群の数や各レンズ群の屈折力）、各レンズ群のズーミングに伴う移動軌跡、そして各レンズ群の変倍負担や屈折力分担等の構成を適切に設定することが重要である。   In a positive lead type zoom lens, it is important to appropriately set each element constituting the zoom lens in order to obtain a small size of the entire system and high optical performance while ensuring a high zoom ratio. For example, it is important to properly set the zoom type (number of lens groups and refractive power of each lens group), the movement trajectory associated with zooming of each lens group, and the variable magnification and refractive power sharing of each lens group. It is.

また、近年、フォーカシングに際しては、動画撮影に適したフォーカシング方式が要望されている。例えばフォーカシングが高速で、しかもフォーカシングに際して収差変動が少なく、物体距離全般にわたり高い光学性能を有するフォーカシング方式が要求されている。   In recent years, focusing methods suitable for moving image shooting have been demanded. For example, there is a demand for a focusing method that has high-speed focusing, little aberration variation during focusing, and high optical performance over the entire object distance.

一般に、フォーカシングに伴う収差変動を少なくし、物体距離全般にわたり高い光学性能を得るには、フォーカシング用のレンズ群（フォーカスレンズ群）の選定及びフォーカスレンズ群のレンズ構成等を適切に設定することが重要になってくる。これらの構成が適切でないと、高ズーム比化を図る際に全系が大型化し、又、ズーミング及びフォーカシングに伴う諸収差の変動が増大し、全ズーム範囲、及び物体距離全般にわたり高い光学性能を得るのが大変難しくなってくる。   In general, in order to reduce aberration fluctuations associated with focusing and to obtain high optical performance over the entire object distance, it is necessary to select a focusing lens group (focus lens group) and set the lens configuration of the focus lens group appropriately. It becomes important. If these configurations are not appropriate, the entire system becomes larger when a high zoom ratio is achieved, and fluctuations in various aberrations associated with zooming and focusing increase, resulting in high optical performance over the entire zoom range and overall object distance. It becomes very difficult to get.

本発明は、光学系全体が小型で、広画角かつ高ズーム比で、しかも全ズーム範囲及び物体距離全般にわたり高い光学性能が容易に得られる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 and an image pickup apparatus having the zoom lens in which the entire optical system is small, has a wide angle of view and a high zoom ratio, and can easily obtain high optical performance over the entire zoom range and the entire object distance. To do.

本発明のズームレンズは、物体側から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、負の屈折力の第６レンズ群、正の屈折力の第７レンズ群から構成され、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において、
フォーカシングに際して前記第３レンズ群と前記第４レンズ群の間隔が変化し、
前記第３レンズ群に含まれる正レンズの中で最も像側に配置された正レンズの材料のアッベ数をνｄ３ｐ、前記第２レンズ群の焦点距離をｆ２、前記第３レンズ群の焦点距離をｆ３、前記第４レンズ群の焦点距離をｆ４、広角端から望遠端へのズーミングにおける前記第１レンズ群の移動量をｍ１とするとき、
５０＜νｄ３ｐ＜１００
１．０＜｜ｆ４／ｆ３｜＜１．６５
０．１０＜｜ｆ２｜／ｍ１＜０．３５
なる条件式を満たす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 fourth lens group having a refractive power, a fifth lens group having a positive refractive power, a sixth lens group having a negative refractive power, and a seventh lens group having a positive refractive power. In the changing zoom lens,
The distance between the third lens group and the fourth lens group changes during focusing,
Of the positive lenses included in the third lens group, the Abbe number of the material of the positive lens arranged closest to the image side is νd3p, the focal length of the second lens group is f2, and the focal length of the third lens group is f3, when the focal length of the fourth lens group is f4, and the amount of movement of the first lens group in zooming from the wide-angle end to the telephoto end is m1,
50 <νd3p <100
1.0 <| f4 / f3 | <1.65
0.10 <| f2 | / m1 <0.35
It is characterized by satisfying the following conditional expression.

本発明によれば、光学系全体が小型で、広画角かつ高ズーム比で、しかも全ズーム範囲及び物体距離全般にわたり高い光学性能が容易に得られる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 optical system is small, has a wide angle of view and a high zoom ratio, and can easily obtain high optical performance over the entire zoom range and the entire object distance.

（Ａ），（Ｂ），（Ｃ）実施例１の広角端、中間ズーム位置、望遠端におけるレンズ断面図(A), (B), (C) Lens cross-sectional views at the wide-angle end, the intermediate zoom position, and the telephoto end of Embodiment 1. （Ａ），（Ｂ），（Ｃ）実施例１の広角端，中間ズーム位置，望遠端における収差図(A), (B), (C) Aberration diagrams at the wide-angle end, intermediate zoom position, and telephoto end of Example 1. （Ａ），（Ｂ），（Ｃ）実施例２の広角端、中間ズーム位置、望遠端におけるレンズ断面図(A), (B), (C) Cross-sectional views of lenses at the wide-angle end, the intermediate zoom position, and the telephoto end of Embodiment 2. （Ａ），（Ｂ），（Ｃ）実施例２の広角端，中間ズーム位置，望遠端における収差図(A), (B), (C) Aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of Example 2. （Ａ），（Ｂ），（Ｃ）実施例３の広角端、中間ズーム位置、望遠端におけるレンズ断面図(A), (B), (C) Lens cross-sectional views at the wide-angle end, the intermediate zoom position, and the telephoto end of Embodiment 3 （Ａ），（Ｂ），（Ｃ）実施例３の広角端，中間ズーム位置，望遠端における収差図(A), (B), (C) Aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of Example 3. （Ａ），（Ｂ），（Ｃ）実施例４の広角端、中間ズーム位置、望遠端におけるレンズ断面図(A), (B), (C) Cross-sectional views of lenses at the wide-angle end, the intermediate zoom position, and the telephoto end of Embodiment 4. （Ａ），（Ｂ），（Ｃ）実施例４の広角端，中間ズーム位置，望遠端における収差図(A), (B), (C) Aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of Example 4. 本発明の撮像装置の要部概略図Schematic diagram of main parts of an imaging apparatus of the present invention

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、物体側から像側へ順に、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、負の屈折力の第４レンズ群、正の屈折力の第５レンズ群、１以上のレンズ群を有する後群から構成される。そして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。フォーカシングに際して第３レンズ群と第４レンズ群の間隔が変化する。   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, in order from the object side to the image 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, and a negative lens having a negative refractive power. A fourth lens group, a fifth lens group having a positive refractive power, and a rear group having one or more lens groups. The distance between adjacent lens units changes during zooming. During focusing, the distance between the third lens group and the fourth lens group changes.

図１（Ａ），（Ｂ），（Ｃ）は本発明の実施例１のズームレンズの広角端（短焦点距離端），中間ズーム位置，望遠端（長焦点距離端）におけるレンズ断面図である。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、中間ズーム位置、望遠端における収差図である。実施例１はズーム比４．１２、開口比３．６０〜５．８３、半画角４１．２°〜１２．０°程度のズームレンズである。   1A, 1B, and 1C are lens cross-sectional views at the wide-angle end (short focal length end), the intermediate zoom position, and the telephoto end (long focal length end) of the zoom lens according to Embodiment 1 of the present invention. is there. 2A, 2B, and 2C are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively, of the zoom lens according to the first exemplary embodiment. Embodiment 1 is a zoom lens having a zoom ratio of 4.12, an aperture ratio of 3.60 to 5.83, and a half angle of view of 41.2 ° to 12.0 °.

図３（Ａ），（Ｂ），（Ｃ）は本発明の実施例２のズームレンズの広角端，中間ズーム位置，望遠端におけるレンズ断面図である。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，中間ズーム位置，望遠端における収差図である。実施例２はズーム比６．８１、開口比２．８８〜５．６０、半画角３７．０°〜２．６５°程度のズームレンズである。   3A, 3B, and 3C are lens cross-sectional views at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens according to Embodiment 2 of the present invention. 4A, 4B, and 4C are aberration diagrams of the zoom lens of Embodiment 2 at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively. Example 2 is a zoom lens having a zoom ratio of 6.81, an aperture ratio of 2.88 to 5.60, and a half angle of view of about 37.0 ° to 2.65 °.

図５（Ａ），（Ｂ），（Ｃ）は本発明の実施例３のズームレンズの広角端，中間ズーム位置，望遠端におけるレンズ断面図である。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，中間ズーム位置，望遠端における収差図である。実施例３はズーム比７．２２、開口比３．４８〜５．６０、半画角３７．０°〜２．６５°程度のズームレンズである。   5A, 5B, and 5C are lens cross-sectional views at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens according to Embodiment 3 of the present invention. 6A, 6B, and 6C are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively, of the zoom lens according to the third exemplary embodiment. Example 3 is a zoom lens having a zoom ratio of 7.22, an aperture ratio of 3.48 to 5.60, and a half angle of view of about 37.0 ° to 2.65 °.

図７（Ａ），（Ｂ），（Ｃ）は本発明の実施例４のズームレンズの広角端，中間ズーム位置，望遠端におけるレンズ断面図である。図８（Ａ），（Ｂ），（Ｃ）はそれぞれ実施例３のズームレンズの広角端，中間ズーム位置，望遠端における収差図である。実施例４はズーム比１６．２８、開口比３．３９〜５．８０、半画角３７．０°〜２．６５°程度のズームレンズである。図９は本発明のズームレンズを備えるデジタルスチルカメラ（撮像装置）の要部概略図である。   7A, 7B, and 7C are lens cross-sectional views at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens according to the fourth embodiment of the present invention. 8A, 8B, and 8C are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively, of the zoom lens according to the third exemplary embodiment. Example 4 is a zoom lens having a zoom ratio of 16.28, an aperture ratio of 3.39 to 5.80, and a half angle of view of about 37.0 ° to 2.65 °. FIG. 9 is a schematic diagram of a main part of a digital still camera (imaging device) including the zoom lens of the present invention.

各実施例のズームレンズはビデオカメラやデジタルスチルカメラ、銀塩フィルムカメラ、ＴＶカメラなどの撮像装置に用いられる撮影レンズ系である。尚、各実施例のズームレンズは投射装置（プロジェクタ）用の投射光学系として用いることもできる。レンズ断面図において、左方が物体側（前方）で、右方が像側（後方）である。また、レンズ断面図において、ｉを物体側からのレンズ群の順番とすると、Ｌｉは第ｉレンズ群を示す。ＬＲは１以上のレンズ群を有する後群である。   The zoom lens of each embodiment is a photographic lens system used in an imaging apparatus such as a video camera, a digital still camera, a silver salt film camera, or a TV camera. In addition, the zoom lens of each embodiment can also be used as a projection optical system for a projection apparatus (projector). In the lens cross-sectional view, the left side is the object side (front), and the right side is the image side (rear). In the lens cross-sectional view, when i is the order of the lens group from the object side, Li indicates the i-th lens group. LR is a rear group having one or more lens groups.

図１，図３，図５の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。後群ＬＲは負の屈折力の第６レンズ群Ｌ６、正の屈折力の第７レンズ群Ｌ７より構成されている。   In the lens cross-sectional views of FIGS. 1, 3, and 5, 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. The rear group LR includes a sixth lens unit L6 having a negative refractive power and a seventh lens unit L7 having a positive refractive power.

図７のレンズ断面図において、Ｌ１は正の屈折力の第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。後群ＬＲは負の屈折力の第６レンズ群Ｌ６より構成されている。   In the lens cross-sectional view of FIG. 7, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, L3 is a third lens group having a positive refractive power, and L4 is a negative refractive power. The fourth lens unit L5 is a fifth lens unit having a positive refractive power. The rear group LR includes a sixth lens unit L6 having a negative refractive power.

レンズ断面図において、ＳＰは開放Ｆナンバー（Ｆｎｏ）の光束を決定（制限）する開口絞りである。ＩＰは像面である。像面ＩＰは、ビデオカメラやデジタルスチルカメラの撮影光学系としてズームレンズを使用する際には、ＣＣＤセンサやＣＭＯＳセンサなどの固体撮像素子（光電変換素子）の撮像面に相当する。銀塩フィルムカメラの撮影光学系としてズームレンズを使用する際には、フィルム面に相当する。矢印は広角端から望遠端へのズーミング（変倍）に際して、各レンズ群の移動軌跡及び無限遠から近距離へのフォーカシングに際しての移動方向を示している。   In the lens cross-sectional view, SP is an aperture stop that determines (limits) a light beam having an open F number (Fno). IP is the image plane. The image plane IP corresponds to an imaging plane of a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor when a zoom lens is used as a photographing optical system of a video camera or a digital still camera. When a zoom lens is used as a photographing optical system of a silver salt film camera, it corresponds to a film surface. The arrows indicate the movement trajectory of each lens unit during zooming from the wide-angle end to the telephoto end and the moving direction during focusing from infinity to a short distance.

収差図においてＦｎｏはＦナンバー、ωは半画角（度）であり、光線追跡値による半画角である。球面収差図において、実線のｄはｄ線（波長５８７．５６ｎｍ）、２点鎖線のｇはｇ線（波長４３５．８ｎｍ）である。   In the aberration diagrams, Fno is the F number, and ω is the half field angle (degrees), which is the half field angle based on the ray tracing value. In the spherical aberration diagram, the solid line d is the d line (wavelength 587.56 nm), and the two-dot chain line g is the g line (wavelength 435.8 nm).

非点収差図で実線のΔＳはｄ線におけるサジタル像面、点線のΔＭはｄ線におけるメリディオナル像面である。歪曲収差はｄ線について示している。倍率色収差図において２点鎖線はｇ線である。尚、以下の各実施例において広角端と望遠端は変倍用のレンズ群が機構上、光軸上を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 astigmatism diagram, the solid line ΔS is the sagittal image plane at the d line, and the dotted line ΔM is the meridional image plane at the d line. Distortion is shown for the d-line. In the lateral chromatic aberration diagram, the two-dot chain line is the g-line. In each of the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the zoom lens group is positioned at both ends of a range in which the zoom lens unit can move on the optical axis.

本発明のズームレンズでは、高ズーム比を確保しつつ、ズーム全域で諸収差を良好に補正するために次の如く構成している。   The zoom lens according to the present invention is configured as follows in order to satisfactorily correct various aberrations in the entire zoom range while ensuring a high zoom ratio.

物体側から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、１つ以上のレンズ群を有する後群より構成している。そして、広角端から望遠端へのズーミングに際し、第１レンズ群Ｌ１は物体側へ移動し、第２レンズ群Ｌ２は物体側へ移動してズーミングを行っている。 A first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, and a first lens unit L3 having a negative refractive power, which are arranged in order from the object side to the image side. The lens unit includes a four lens unit L4, a fifth lens unit L5 having a positive refractive power, and a rear unit having one or more lens units. During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves toward the object side, and the second lens unit L2 moves toward the object side for zooming.

ズーミングに際して、第１レンズ群Ｌ１と第２レンズ群Ｌ２の間隔が増大することで変倍を行い、第２レンズ群Ｌ２以降のレンズ群も移動させることで、望遠端における入射瞳を任意の位置に移動さて、全系の小型化を図っている。また、第３レンズ群Ｌ３を移動させることで、第１レンズ群Ｌ１と第２レンズ群Ｌ２の変倍作用を分担するようにして、ズーミングに際して第１レンズ群Ｌ１と第２レンズ群Ｌ２の移動量を軽減して、望遠端におけるレンズ全長を短縮している。   During zooming, zooming is performed by increasing the distance between the first lens unit L1 and the second lens unit L2, and the lens unit subsequent to the second lens unit L2 is moved to move the entrance pupil at the telephoto end to an arbitrary position. In order to reduce the size of the entire system. Further, by moving the third lens unit L3, the zooming operation of the first lens unit L1 and the second lens unit L2 is shared, and the first lens unit L1 and the second lens unit L2 are moved during zooming. By reducing the amount, the total lens length at the telephoto end is shortened.

さらに、広角端から望遠端へのズーミングに際して第３レンズ群Ｌ３と第４レンズ群Ｌ４の間隔を増大することで変倍を行い、広角端において前玉有効径の増大を軽減しつつ、高ズーム比化に伴うレンズ全長の増大を軽減している。また、フォーカシングに際しては、第２レンズ群Ｌ２、第３レンズ群Ｌ３、第４レンズ群Ｌ４の少なくとも１つのレンズ群が移動するようにしている。   Furthermore, zooming is performed by increasing the distance between the third lens unit L3 and the fourth lens unit L4 during zooming from the wide-angle end to the telephoto end, and high zoom is achieved while reducing the increase in the effective diameter of the front lens at the wide-angle end. The increase in the total lens length due to the ratio is reduced. In focusing, at least one of the second lens unit L2, the third lens unit L3, and the fourth lens unit L4 is moved.

第３レンズ群Ｌ３の像側をアフォーカル又は略アフォーカルとすることで、フォーカシングに際しての軸上光線の入射高さｈの変化を小さくしている。これにより、フォーカシングによる球面収差や軸上色収差の変動を軽減している。また、第３レンズ群Ｌ３の像側をアフォーカルとしているため、第４レンズ群Ｌ４からの出射光束は発散光束となり、それを収束させるために、像側の後群ＬＲの正の屈折力を強くしている。これにより、レトロフォーカスのパワー配置が形成しやすくなり、広画角化と全系の小型化を容易にしている。   By making the image side of the third lens unit L3 afocal or substantially afocal, a change in the incident height h of the on-axis light beam during focusing is reduced. As a result, variations in spherical aberration and axial chromatic aberration due to focusing are reduced. Further, since the image side of the third lens unit L3 is afocal, the light beam emitted from the fourth lens unit L4 becomes a divergent light beam, and in order to converge it, the positive refractive power of the rear group LR on the image side is used. It is getting stronger. This facilitates the formation of a retrofocus power arrangement, facilitating a wide angle of view and downsizing of the entire system.

また近距離物体へのフォーカシングに際しての収差変動、特に球面収差の変動および像面湾曲の変動を軽減している。第３レンズ群Ｌ３に含まれる正レンズの中で最も像側に配置された正レンズＧ３Ｒの材料のアッベ数をνｄ３ｐとする。このとき、
５０＜νｄ３ｐ＜１００ ・・・（１）
なる条件式を満たす。 In addition, aberration fluctuations during focusing on short-distance objects, particularly spherical aberration fluctuations and field curvature fluctuations are reduced. The Abbe number of the material of the positive lens G3R arranged on the most image side among the positive lenses included in the third lens unit L3 is denoted by νd3p. At this time,
50 <νd3p <100 (1)
This satisfies the conditional expression

第３レンズ群Ｌ３が１つの正レンズより構成されるときは、この１つの正レンズが正レンズＧ３Ｒである。材料のアッベ数νｄはフラウンホーファ線のｄ線、Ｆ線、Ｃ線における屈折率をそれぞれＮｄ，ＮＦ，ＮＣとするとき、
νｄ＝（Ｎｄ−１）／（ＮＦ−ＮＣ）
で定義される。 When the third lens unit L3 is composed of one positive lens, this one positive lens is the positive lens G3R. The Abbe number νd of the material is Nd, NF, NC when the refractive indexes of the Fraunhofer line d-line, F-line, and C-line are
νd = (Nd−1) / (NF−NC)
Defined by

条件式（１）は、第３レンズ群Ｌ３の正レンズＧ３Ｒの材料のアッベ数を規定し、主にフォーカシングに際しての軸上色収差を小さく抑えるための条件を規定している。条件式（１）の下限を超えると、フォーカシングに際して軸上色収差の変動が大きくなり、特に望遠側において軸上色収差の変動が大きくなり、好ましくない。各実施例において更に好ましくは条件式（１）の数値範囲を次の如く設定するのが良い。   Conditional expression (1) defines the Abbe number of the material of the positive lens G3R of the third lens unit L3, and prescribes a condition for mainly suppressing axial chromatic aberration during focusing. Exceeding the lower limit of conditional expression (1) is not preferable because the variation in axial chromatic aberration increases during focusing, and the variation in axial chromatic aberration increases particularly on the telephoto side. In each embodiment, the numerical range of conditional expression (1) is more preferably set as follows.

５５＜νｄ３ｐ＜９０ ・・・（１ａ）
光学材料はアッベ数が大きい領域では、屈折率が小さい値をとる傾向が大きいため、アッベ数の大きい低分散材料を採用した場合、所望の屈折力を持たせるためには、レンズ面の曲率を大きくする必要がある。 55 <νd3p <90 (1a)
In the region where the Abbe number is large, the optical material tends to have a small refractive index. Therefore, when a low dispersion material having a large Abbe number is used, the curvature of the lens surface must be set to have a desired refractive power. It needs to be bigger.

条件式（１ａ）を満たすと、高ズーム比化によるズーミングに際しての像面湾曲の変動を抑制しつつ、高い光学性能を確保しやすくなる。更に好ましくは条件式（１ａ）の数値範囲を次の如く設定するのが良い。   When the conditional expression (1a) is satisfied, it becomes easy to ensure high optical performance while suppressing fluctuations in field curvature during zooming due to a high zoom ratio. More preferably, the numerical range of the conditional expression (1a) is set as follows.

６０＜νｄ３ｐ＜８３ ・・・（１ｂ）
以上のようにレンズ群構成を適切にし、条件式（１）を満たすことにより、ズーム全域で高い光学性能を達成した高ズーム比で全系が小型なズームレンズを得ている。 60 <νd3p <83 (1b)
As described above, by making the lens group configuration appropriate and satisfying conditional expression (1), a zoom lens with a high zoom ratio that achieves high optical performance over the entire zoom range and a small zoom lens system is obtained.

各実施例において、更に好ましくは次の条件式のうち１以上を満足するのがよい。第１レンズ群Ｌ１の焦点距離をｆ１、第２レンズ群Ｌ２の焦点距離をｆ２、第３レンズ群Ｌ３の焦点距離をｆ３、第４レンズ群Ｌ４の焦点距離をｆ４、第５レンズ群Ｌ５の焦点距離をｆ５、第６レンズ群Ｌ６の焦点距離をｆ６とする。広角端および望遠端における全系の焦点距離を各々ｆｗ，ｆｔとする。また、広角端から望遠端へのズーミングにおける第１レンズ群の移動量をｍ１とする。   In each embodiment, it is more preferable to satisfy one or more of the following conditional expressions. The focal length of the first lens unit L1 is f1, the focal length of the second lens unit L2 is f2, the focal length of the third lens unit L3 is f3, the focal length of the fourth lens unit L4 is f4, and the fifth lens unit L5 The focal length is f5, and the focal length of the sixth lens unit L6 is f6. Let fw and ft be the focal lengths of the entire system at the wide-angle end and the telephoto end, respectively. Also, let m1 be the amount of movement of the first lens unit during zooming from the wide-angle end to the telephoto end.

ただし、レンズ群の移動量は、広角端と望遠端におけるレンズ群の光軸上の位置の差であり、広角端に比べて望遠端においてレンズ群が物体側に位置している場合を正とする。   However, the amount of movement of the lens group is the difference in position on the optical axis of the lens group at the wide-angle end and the telephoto end, and is positive when the lens group is located on the object side at the telephoto end compared to the wide-angle end. To do.

第４レンズ群Ｌ４は負レンズＧ４ｎを含む１つのレンズ成分から構成され、負レンズＧ４ｎの材料の屈折率と、アッベ数を各々ｎｄ４ｎ，νｄ４ｎとする。ここでレンズ成分とは単一レンズ又は複数のレンズを接合した接合レンズをいう。このとき次の条件式のうち１以上を満足するのが良い。   The fourth lens unit L4 includes one lens component including the negative lens G4n, and the refractive index and Abbe number of the material of the negative lens G4n are nd4n and νd4n, respectively. Here, the lens component refers to a single lens or a cemented lens in which a plurality of lenses are cemented. At this time, one or more of the following conditional expressions should be satisfied.

１．０＜｜ｆ４／ｆ３｜＜１．６５ ・・・（２）
０．１０＜｜ｆ２｜／ｍ１＜０．３５ ・・・（３）
０．０５＜ｆ５／ｆｔ＜０．４５ ・・・（４）
２．０＜ｆ１／ｆｗ＜９．０ ・・・（５）
０．４＜｜ｆ３×ｆ４｜１／２／ｆ５＜３．４ ・・・（６）
１．５２＜ｎｄ４ｎ＜２．１０ ・・・（７）
２５＜νｄ４ｎ＜７０ ・・・（８）
１．０＜｜ｆ６｜／ｆｗ＜１４．０ ・・・（９）
次に前述の各条件式の技術的意味について説明する。 1.0 <| f4 / f3 | < 1.65 (2)
0.10 <| f2 | / m1 < 0.35 (3)
0.05 <f5 / ft <0.45 (4)
2.0 <f1 / fw <9.0 (5)
0.4 <| f3 × f4 | 1/2 /f5<3.4 (6)
1.52 <nd4n <2.10 (7)
25 <νd4n <70 (8)
1.0 <| f6 | / fw <14.0 (9)
Next, the technical meaning of each conditional expression will be described.

条件式（２）は、第４レンズ群Ｌ４の焦点距離を第３レンズ群Ｌ３の焦点距離で規定したものである。条件式（２）の上限を超えて、第４レンズ群Ｌ４の屈折力が弱くなりすぎると、フォーカシングを行う際、所望の空間を確保する必要があり、レンズ全長が増大してくる。条件式（２）の下限を超えて、第３レンズ群Ｌ３の屈折力が弱くなると、第３レンズ群Ｌ３から出射する光束の収斂が弱くなり、フォーカシングによる球面収差や軸上色収差の変動が大きくなるので、好ましくない。   Conditional expression (2) defines the focal length of the fourth lens unit L4 with the focal length of the third lens unit L3. If the upper limit of conditional expression (2) is exceeded and the refractive power of the fourth lens unit L4 becomes too weak, it is necessary to secure a desired space when performing focusing, and the total lens length increases. When the lower limit of conditional expression (2) is exceeded and the refractive power of the third lens unit L3 becomes weak, the convergence of the light beam emitted from the third lens unit L3 becomes weak, and the variation in spherical aberration and axial chromatic aberration due to focusing becomes large. This is not preferable.

条件式（３）は、第２レンズ群Ｌ２の焦点距離ｆ２を広角端から望遠端へのズーミングにおける第１レンズ群の移動量ｍ１で規定したものである。条件式（２）の上限を超えて、第２レンズ群Ｌ２の屈折力が小さくなる、または第１レンズ群の移動量が小さくなると高ズーム比化を図る際、像面湾曲の補正には有利だが、小型化との両立が難しく好ましくない。条件式（３）の下限を超えて、第２レンズ群Ｌ２の屈折力が大きくなると、広角端における像面湾曲が増大してくるので好ましくない。   Conditional expression (3) defines the focal length f2 of the second lens unit L2 by the amount of movement m1 of the first lens unit during zooming from the wide-angle end to the telephoto end. Exceeding the upper limit of conditional expression (2), when the refractive power of the second lens unit L2 becomes small or the movement amount of the first lens unit becomes small, it is advantageous for correcting curvature of field when a high zoom ratio is achieved. However, coexistence with downsizing is difficult and undesirable. If the refractive power of the second lens unit L2 exceeds the lower limit of the conditional expression (3), the field curvature at the wide angle end increases, which is not preferable.

条件式（４）は、第５レンズ群の屈折力を規定した式であり、主に球面収差やコマ収差を良好に補正しつつ、高ズーム比化を図るためのものである。条件式（４）の上限を超えて、第５レンズ群Ｌ５の屈折力が弱くなると、レンズ全長を短縮することが困難となり、好ましくない。また、高ズーム比化を達成することが難しくなる。条件式（４）の下限を超えて、第５レンズ群Ｌ５の屈折力が強くなると、全系の小型化を図るのが容易となるが、球面収差やコマ収差が増大し、これらの収差の補正が難しく、好ましくない。   Conditional expression (4) is an expression defining the refractive power of the fifth lens group, and is mainly for achieving a high zoom ratio while satisfactorily correcting spherical aberration and coma. If the upper limit of conditional expression (4) is exceeded and the refractive power of the fifth lens unit L5 becomes weak, it is difficult to shorten the total lens length, which is not preferable. In addition, it becomes difficult to achieve a high zoom ratio. If the lower limit of conditional expression (4) is exceeded and the refractive power of the fifth lens unit L5 becomes strong, it becomes easy to reduce the size of the entire system, but spherical aberration and coma increase, and these aberrations increase. Correction is difficult and undesirable.

条件式（５）は、第１レンズ群Ｌ１の屈折力を規定した式であり、主に望遠側において球面収差やコマ収差を良好に抑えつつ、かつ望遠端におけるレンズ全長を短縮するためのものである。条件式（５）の上限を超えて、第１レンズ群Ｌ１の屈折力が小さくなると、望遠端においてレンズ全長を短縮することが困難となり、好ましくない。また、高ズーム比化を達成することが難しくなる。条件式（５）の下限を超えて、第１レンズ群Ｌ１の屈折力が大きくなると、望遠側において球面収差やコマ収差が多く発生し、これらの収差の補正が難しくなり、好ましくない。   Conditional expression (5) is an expression that defines the refractive power of the first lens unit L1, mainly for suppressing spherical aberration and coma favorably on the telephoto side and reducing the total lens length at the telephoto end. It is. If the upper limit of conditional expression (5) is exceeded and the refractive power of the first lens unit L1 becomes small, it becomes difficult to shorten the total lens length at the telephoto end, which is not preferable. In addition, it becomes difficult to achieve a high zoom ratio. If the lower limit of conditional expression (5) is exceeded and the refracting power of the first lens unit L1 increases, spherical aberration and coma aberration often occur on the telephoto side, making it difficult to correct these aberrations, which is not preferable.

条件式（６）は、第３レンズ群Ｌ３の焦点距離ｆ３と第４レンズ群Ｌ４の焦点距離ｆ４の相乗平均の絶対値を第５レンズ群Ｌ５の焦点距離で規定した式である。条件式（６）の下限を超えて第５レンズ群Ｌ５の屈折力が小さくなると、第５レンズ群Ｌ５に続く後続のレンズ群の径方向が増大し、と高ズーム比化を図った際、望遠側におけるレンズ全長が長くなり、好ましくない。条件式（６）の上限を超えて第５レンズ群Ｌ５の屈折力が大きくなると、高ズーム比化およびレンズ全長の短縮化が容易になるが、第５レンズ群Ｌ５より球面収差やコマ収差が大きく発生してくる。   Conditional expression (6) is an expression in which the absolute value of the geometric mean of the focal length f3 of the third lens unit L3 and the focal length f4 of the fourth lens unit L4 is defined by the focal length of the fifth lens unit L5. When the refractive power of the fifth lens unit L5 decreases beyond the lower limit of conditional expression (6), the radial direction of the subsequent lens unit following the fifth lens unit L5 increases, and when a high zoom ratio is achieved, The total lens length on the telephoto side becomes longer, which is not preferable. If the refractive power of the fifth lens unit L5 increases beyond the upper limit of the conditional expression (6), it is easy to increase the zoom ratio and shorten the total lens length. However, spherical aberration and coma aberration are greater than those of the fifth lens unit L5. It will occur greatly.

これらの収差を第５レンズ群Ｌ５に続く後続のレンズ群で補正しようとするとレンズ枚数が増加してくるので好ましくない。   It is not preferable to correct these aberrations with the subsequent lens unit following the fifth lens unit L5 because the number of lenses increases.

条件式（７），（８）は、高ズーム比化とレンズ全長の短縮化を図りつつ、フォーカシングに際して像面湾曲と球面収差、そして色収差の変動を軽減するためのものである。条件式（７）の上限を超えると、第４レンズ群Ｌ４の屈折力を所定量確保するとき、球面収差と像面湾曲が増大し、これらの収差を補正することが難しく、好ましくない。条件式（７）の下限を超えると、第４レンズ群Ｌ４の屈折力を所定量確保するとき、第４レンズ群Ｌ４の負レンズＧ４ｎのレンズ面の曲率が強くなり、望遠端において低次の収差係数が増大し、特にコマ収差が大きくなり好ましくない。   Conditional expressions (7) and (8) are for reducing fluctuations in field curvature, spherical aberration, and chromatic aberration during focusing while achieving a high zoom ratio and shortening the total lens length. If the upper limit of conditional expression (7) is exceeded, when a predetermined amount of refractive power of the fourth lens unit L4 is ensured, spherical aberration and field curvature increase, and it is difficult to correct these aberrations. When the lower limit of conditional expression (7) is exceeded, the curvature of the lens surface of the negative lens G4n of the fourth lens unit L4 becomes strong when a predetermined amount of refractive power of the fourth lens unit L4 is secured, and a low-order is obtained at the telephoto end. The aberration coefficient increases, and in particular, coma becomes large.

条件式（８）は、第４レンズ群Ｌ４の負レンズＧ４ｎの材料のアッベ数を規定したもので、主にフォーカシングに際して軸上色収差の発生を軽減するためのものである。条件式（８）を外れると、フォーカシングに際して軸上色収差が増大してくるので良くない。   Conditional expression (8) defines the Abbe number of the material of the negative lens G4n of the fourth lens unit L4, and is mainly for reducing the occurrence of axial chromatic aberration during focusing. If the conditional expression (8) is not satisfied, the axial chromatic aberration increases during focusing, which is not good.

条件式（９）は、第６レンズ群Ｌ６の焦点距離を広角端における全系の焦点距離で規定したものである。広画角化を図った際、前玉（第１レンズ群Ｌ１）の径方向が増大する傾向となるが、条件式（９）を満たすことにより、前玉有効径の小型化を図りつつ、広画角化を容易にしている。   Conditional expression (9) defines the focal length of the sixth lens unit L6 with the focal length of the entire system at the wide angle end. When widening the angle of view, the radial direction of the front lens (first lens unit L1) tends to increase. By satisfying conditional expression (9), the effective diameter of the front lens can be reduced. Widening the angle of view is easy.

条件式（９）の下限を超えて第６レンズ群Ｌ６の負の屈折力が大きくなると（負の屈折力の絶対値が大きくなると）、高ズーム比化を図った際、ズーミングに際して歪曲収差の変動が大きくなり、好ましくない。条件式（９）の上限を超えて第６レンズ群Ｌ６の負の屈折力が小さくなると（負の屈折力の絶対値が小さくなると）、レンズ全系の小型化は容易になるが、像面湾曲、非点収差、そして球面収差の補正が難しくなり、好ましくない。更に好ましくは条件式（２）乃至（９）の数値範囲を次の如く設定するのが良い。   When the negative refracting power of the sixth lens unit L6 increases beyond the lower limit of conditional expression (9) (when the absolute value of the negative refracting power increases), when zooming in at high zoom ratio, The fluctuation becomes large, which is not preferable. If the negative refracting power of the sixth lens unit L6 is reduced beyond the upper limit of conditional expression (9) (the absolute value of the negative refracting power is reduced), the entire lens system can be easily downsized, but the image plane Correction of curvature, astigmatism, and spherical aberration becomes difficult, which is not preferable. More preferably, the numerical ranges of the conditional expressions (2) to (9) are set as follows.

１．０＜｜ｆ４／ｆ３｜＜１．６５ ・・・（２ａ）
０．１２＜｜ｆ２｜／ｍ１＜０．３５ ・・・（３ａ）
０．１０＜ｆ５／ｆｔ＜０．３５ ・・・（４ａ）
３．０＜ｆ１／ｆｗ＜８．０ ・・・（５ａ）
０．６＜｜ｆ３×ｆ４｜１／２／ｆ５＜３．０ ・・・（６ａ）
１．５６＜ｎｄ４ｎ＜２．００ ・・・（７ａ）
３０＜νｄ４ｎ＜６０ ・・・（８ａ）
１．１＜｜ｆ６｜／ｆｗ＜１３．０ ・・・（９ａ） 1.0 <| f4 / f3 | < 1.65 (2a)
0.12 <| f2 | / m1 < 0.35 (3a)
0.10 <f5 / ft <0.35 (4a)
3.0 <f1 / fw <8.0 (5a)
0.6 <| f3 × f4 | 1/2 /f5<3.0 (6a)
1.56 <nd4n <2.00 (7a)
30 <νd4n <60 (8a)
1.1 <| f6 | / fw <13.0 (9a)

条件式（２ａ）を満たすことにより、第４レンズ群Ｌ４と第３レンズ群Ｌ３の屈折力分担がより適正となり、高ズーム比化とフォーカシングによる球面収差の変動を軽減することができ、好ましい。   Satisfying the conditional expression (2a) is preferable because the refractive power sharing between the fourth lens unit L4 and the third lens unit L3 becomes more appropriate, and the variation in spherical aberration due to the high zoom ratio and focusing can be reduced.

条件式（３ａ）を満たすことにより、第２レンズ群Ｌ２の屈折力分担がより適正となり、広角端におけるレンズ全長の短縮化および前玉有効径の小型化が容易になる。条件式（４ａ）を満たすことにより、望遠端の長焦点化を図りつつ、ズーミングに際しての像面湾曲の変動を軽減するのが容易になる。条件式（５ａ）を満たすことにより、望遠端におけるレンズ全長の短縮化と球面収差の補正が容易になる。条件式（６ａ）を満たすことにより、ズーム全域に渡って球面収差を良好に補正するのが容易になる。   By satisfying the conditional expression (3a), the refractive power sharing of the second lens unit L2 becomes more appropriate, and the total lens length at the wide-angle end and the front lens effective diameter can be easily reduced. By satisfying conditional expression (4a), it becomes easy to reduce fluctuations in field curvature during zooming while achieving a long focal length at the telephoto end. By satisfying conditional expression (5a), it becomes easy to shorten the total lens length and correct spherical aberration at the telephoto end. By satisfying conditional expression (6a), it becomes easy to satisfactorily correct spherical aberration over the entire zoom range.

条件式（７ａ）を満たすことにより、フォーカシングに際して像面湾曲の変動を軽減しつつ高ズーム比化が容易になる。条件式（８ａ）を満たすことにより、第６レンズ群Ｌ６の偏芯コマ収差を軽減することが容易になる。条件式（９ａ）を満たすことにより、広角端において歪曲収差を軽減しつつ、レンズ全長の短縮化が容易になる。さらに、好ましくは条件式（２ａ）乃至（９ａ）の数値範囲を次の如く設定するのが良い。   By satisfying conditional expression (7a), it becomes easy to achieve a high zoom ratio while reducing fluctuations in field curvature during focusing. By satisfying conditional expression (8a), it becomes easy to reduce the decentered coma aberration of the sixth lens unit L6. By satisfying conditional expression (9a), it becomes easy to shorten the entire lens length while reducing distortion at the wide-angle end. Furthermore, it is preferable to set the numerical ranges of the conditional expressions (2a) to (9a) as follows.

１．０５＜｜ｆ４／ｆ３｜＜１．６５ ・・・（２ｂ）
０．１５＜｜ｆ２｜／ｍ１＜０．３５ ・・・（３ｂ）
０．１５＜ｆ５／ｆｔ＜０．２５ ・・・（４ｂ）
４．０＜ｆ１／ｆｗ＜７．５ ・・・（５ｂ）
０．８＜｜ｆ３×ｆ４｜ １／２ ／ｆ５＜２．６ ・・・（６ｂ）
１．６０＜ｎｄ４ｎ＜１．９５ ・・・（７ｂ）
３５＜νｄ４ｎ＜５５ ・・・（８ｂ）
１．３＜｜ｆ６｜／ｆｗ＜１２．０ ・・・（９ｂ） 1.05 <| f4 / f3 | <1.65 (2b)
0.15 <| f2 | / m1 <0.35 (3b)
0.15 <f5 / ft <0.25 (4b)
4.0 <f1 / fw <7.5 (5b)
0.8 <| f3 × f4 | 1/2 /f5<2.6 (6b)
1.60 <nd4n <1.95 (7b)
35 <νd4n <55 (8b)
1.3 <| f6 | / fw <12.0 (9b)

各実施例において第１レンズ群Ｌ１の最も物体側に負レンズを配置するのが良く、これによれば広画角化に伴う倍率色収差を軽減するのが容易になる。各実施例において、第４レンズ群Ｌ４は負の屈折力の接合レンズまたは単レンズで構成するのが、高ズーム比化とレンズ全長の短縮化を図るのに好ましい。   In each embodiment, it is preferable to dispose a negative lens closest to the object side of the first lens unit L1, and this makes it easy to reduce chromatic aberration of magnification accompanying a wide angle of view. In each embodiment, it is preferable that the fourth lens unit L4 is composed of a cemented lens or a single lens having a negative refractive power in order to increase the zoom ratio and shorten the total lens length.

以上のように各実施例によれば、広画角で高ズーム比、かつレンズ系全体が小型で、迅速なフォーカシングが容易で、球面収差、コマ収差、像面湾曲などの諸収差を良好に補正した高い光学性能のズームレンズが容易に得られる。   As described above, according to each embodiment, a wide angle of view, a high zoom ratio, a small lens system as a whole, quick focusing is easy, and various aberrations such as spherical aberration, coma and curvature of field are excellent. A corrected zoom lens with high optical performance can be easily obtained.

次に各実施例のレンズ構成について説明する。図１，図３，図５の実施例１，２，３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レンズ群である。Ｌ５は正の屈折力の第５レンズ群、Ｌ６は負の屈折力の第６レンズ群、Ｌ７は正の屈折力の第７レンズ群である。後群ＬＲは第６レンズ群Ｌ６と第７レンズ群Ｌ７より構成されている。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ように矢印の如く各レンズ群が移動する。   Next, the lens configuration of each example will be described. In Examples 1, 2, and 3 of FIGS. 1, 3, and 5, L1 is a first lens unit having a positive refractive power (optical power = reciprocal of focal length), and L2 is a second lens having a negative refractive power. Group L3 is a third lens group having a positive refractive power, and L4 is a fourth lens group having a negative refractive power. L5 is a fifth lens group having a positive refractive power, L6 is a sixth lens group having a negative refractive power, and L7 is a seventh lens group having a positive refractive power. The rear group LR includes a sixth lens group L6 and a seventh lens group L7. Each lens unit moves as indicated by an arrow so that the interval between adjacent lens units changes during zooming.

実施例１，２，３は７群ズームレンズである。図１，図３，図５の実施例１，２，３のズームレンズにおいて、広角端に比べ望遠端における各レンズ群の間隔変化は次のとおりである。第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔は広い。第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔は狭い。第３レンズ群Ｌ３と第４レンズ群Ｌ４との間隔は広い。第４レンズ群Ｌ４と第５レンズ群Ｌ５の間隔は狭い。第５レンズ群Ｌ５と第６レンズ群Ｌ６との間隔は広い。第６レンズ群Ｌ６と第７レンズ群Ｌ７の間隔は狭い。   Examples 1, 2, and 3 are 7-group zoom lenses. In the zoom lenses of Examples 1, 2, and 3 in FIGS. 1, 3, and 5, the change in the distance between the lens groups at the telephoto end as compared with the wide-angle end is as follows. The distance between the first lens unit L1 and the second lens unit L2 is wide. The distance between the second lens unit L2 and the third lens unit L3 is narrow. The distance between the third lens unit L3 and the fourth lens unit L4 is wide. The distance between the fourth lens unit L4 and the fifth lens unit L5 is narrow. The distance between the fifth lens unit L5 and the sixth lens unit L6 is wide. The distance between the sixth lens unit L6 and the seventh lens unit L7 is narrow.

図１，図５の実施例１、３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っている。第４レンズ群Ｌ４の実線の曲線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広角端から望遠端のズーム位置へのズーミングの際の像面変動を補正するための移動軌跡である。また望遠端のズーム位置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を前方へ繰り出すことで行っている。   In Embodiments 1 and 3 of FIGS. 1 and 5, the fourth lens unit L4 is moved on the optical axis to perform focusing. The solid curve 4a and the dotted curve 4b of the fourth lens unit L4 correct image plane fluctuations during zooming from the wide-angle end to the telephoto end zoom position when focusing on an object at infinity and an object at close distance, respectively. It is a movement locus for Further, when focusing from an infinitely distant object to a close object at the zoom position at the telephoto end, the fourth lens unit L4 is moved forward as indicated by an arrow 4c.

図３の実施例２では、第３レンズ群Ｌ３および第４レンズ群Ｌ４を光軸上移動させてフォーカシングを行っている。第３レンズ群Ｌ３の実線の曲線３ａと点線の曲線３ｂ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広角端から望遠端のズーム位置へのズーミングの際の像面変動を補正するための移動軌跡である。また、第３レンズ群Ｌ３と同様に第４レンズ群Ｌ４の実線の曲線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広角端から望遠端のズーム位置へのズーミングの際の像面変動を補正するための移動軌跡である。   In Example 2 in FIG. 3, focusing is performed by moving the third lens unit L3 and the fourth lens unit L4 on the optical axis. The solid curve 3a and the dotted curve 3b of the third lens unit L3 correct the image plane variation during zooming from the wide-angle end to the telephoto end zoom position when focusing on an object at infinity and a short-distance object, respectively. It is a movement locus for Similarly to the third lens unit L3, the solid curve 4a and the dotted curve 4b of the fourth lens unit L4 move from the wide-angle end to the zoom position at the telephoto end when focusing on an object at infinity and an object at close distance, respectively. This is a movement trajectory for correcting image plane fluctuation during zooming.

望遠端のズーム位置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３ｃ、４ｃに示すように第３レンズ群を後方へ繰り込み、矢印４ｃで示すように第４レンズ群Ｌ４を前方へ繰り出すことで行っている。図７の実施例４において、Ｌ１は正の屈折力の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群、Ｌ３は正屈折力の第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、Ｌ６は負の屈折力の第６レンズ群である。後群ＬＲは第６レンズ群Ｌ６より構成されている。   When focusing from an object at infinity to a close object at the zoom position at the telephoto end, the third lens unit is moved backward as indicated by arrows 3c and 4c, and the fourth lens unit L4 is indicated as indicated by arrow 4c. This is done by moving forward. In Example 4 of FIG. 7, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, L3 is a third lens group having a positive refractive power, and L4 is a negative refractive power. The fourth lens group, L5 is a fifth lens group having a positive refractive power, and L6 is a sixth lens group having a negative refractive power. The rear group LR includes a sixth lens group L6.

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ように、矢印の如く各レンズ群が移動する。   Each lens unit moves as indicated by an arrow so that the interval between adjacent lens units changes during zooming.

実施例４は６群ズームレンズである。図７の実施例４のズームレンズにおいて、広角端に比べ望遠端における各レンズ群の間隔変化は次のとおりである。第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広い。第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔が狭い。第３レンズ群Ｌ３と第４レンズ群Ｌ４との間隔が広い。第４レンズ群Ｌ４と第５レンズ群Ｌ５の間隔が狭い。第５レンズ群Ｌ５と第６レンズ群Ｌ６との間隔が広い。   Example 4 is a 6-group zoom lens. In the zoom lens of Example 4 shown in FIG. 7, the change in the distance between the lens units at the telephoto end as compared with the wide-angle end is as follows. The distance between the first lens unit L1 and the second lens unit L2 is wide. The distance between the second lens unit L2 and the third lens unit L3 is narrow. The distance between the third lens unit L3 and the fourth lens unit L4 is wide. The distance between the fourth lens unit L4 and the fifth lens unit L5 is narrow. The distance between the fifth lens unit L5 and the sixth lens unit L6 is wide.

図７の実施例４では、第２レンズ群Ｌ２および第４レンズ群Ｌ４を光軸上移動させてフォーカシングを行っている。第２レンズ群Ｌ２の実線の曲線２ａと点線の曲線２ｂ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広角端から望遠端のズーム位置へのズーミングの際の像面変動を補正するための移動軌跡である。また、第２レンズ群Ｌ２と同時に第４レンズ群Ｌ４の実線の曲線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広角端から望遠端のズーム位置へのズーミングの際の像面変動を補正するための移動軌跡である。   In Example 4 of FIG. 7, focusing is performed by moving the second lens unit L2 and the fourth lens unit L4 on the optical axis. The solid curve 2a and the dotted curve 2b of the second lens unit L2 correct the image plane fluctuation during zooming from the wide-angle end to the telephoto end zoom position when focusing on an object at infinity and an object at close distance, respectively. It is a movement locus for Simultaneously with the second lens unit L2, the solid line curve 4a and the dotted line curve 4b of the fourth lens unit L4 move from the wide-angle end to the telephoto end zoom position when focusing on an object at infinity and a short-distance object, respectively. This is a movement trajectory for correcting image plane variation during zooming.

望遠端のズーム位置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２ｃ、４ｃに示すように第２レンズ群Ｌ２を前方へ繰り出し、矢印４ｃに示すように第４レンズ群Ｌ４を後方へ繰り込むことで行っている。   When focusing from an infinitely distant object to a close object at the zoom position at the telephoto end, the second lens unit L2 is extended forward as indicated by arrows 2c and 4c, and the fourth lens unit L4 is indicated as indicated by arrow 4c. This is done by moving backwards.

各実施例のズームレンズでは、広角端から望遠端へのズーミングに際して、第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広がるよう、第２レンズ群Ｌ２と第３レンズ群Ｌ３との間隔が狭まるように各レンズ群が移動している。このように広角端よりも望遠端で第１レンズ群Ｌ１と第２レンズ群Ｌ２の間隔が広がることで変倍作用を得ている。   In the zoom lens of each embodiment, the distance between the second lens group L2 and the third lens group L3 is widened so that the distance between the first lens group L1 and the second lens group L2 is widened during zooming from the wide-angle end to the telephoto end. Each lens group is moved so that is narrowed. In this way, a zooming action is obtained by increasing the distance between the first lens unit L1 and the second lens unit L2 at the telephoto end rather than at the wide angle end.

以上のような構成とすることで広角端および望遠端においてレンズ全長を短縮しつつ、高ズーム比化を図っている。   With the configuration as described above, a high zoom ratio is achieved while shortening the total lens length at the wide-angle end and the telephoto end.

実施例１乃至４では、第２レンズ群Ｌ２に非球面レンズを採用し、広角端において像面湾曲および歪曲収差を良好に補正している。また、実施例２，３では、第７レンズ群Ｌ７に非球面レンズを採用し、像面湾曲を良好に補正している。   In Examples 1 to 4, an aspherical lens is used for the second lens unit L2, and the field curvature and distortion are corrected well at the wide angle end. In Examples 2 and 3, an aspherical lens is used for the seventh lens unit L7, and the field curvature is corrected well.

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９を用いて説明する。図９において、１０はカメラ本体、１１は実施例１乃至４で説明したいずれか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。尚、各実施例のズームレンズは投射装置（プロジェクタ）用の投射光学系として用いることもできる。   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. In FIG. 9, reference numeral 10 denotes a camera body, and 11 denotes a photographing optical system constituted by any of the zoom lenses described in the first to fourth embodiments. 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. In addition, the zoom lens of each embodiment can also be used as a projection optical system for a projection apparatus (projector).

以下、実施例１乃至４に対応する数値実施例１乃至４の具体的な数値データを示す。各数値実施例においてｉは物体側から数えた順序を示し、ｒｉは第ｉ番目の光学面（第ｉ面）の曲率半径である。ｄｉは第ｉ面と第（ｉ＋１）面との間の軸上間隔である。ｎｄｉ，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、アッベ数である。また非球面係数はＸを光軸方向の面頂点からの変移量、ｈを光軸と垂直な方向の光軸からの高さ、ｒを近軸曲率半径、ｋを円錐定数、Ａ４，Ａ６，Ａ８，Ａ１０，Ａ１２・・・を各次数の非球面係数とするとき、   Hereinafter, specific numerical data of numerical examples 1 to 4 corresponding to the first to fourth examples will be described. In each numerical example, i indicates the order counted from the object side, and ri is the radius of curvature of the i-th optical surface (i-th surface). di is an axial distance between the i-th surface and the (i + 1) -th surface. 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. Further, the aspherical coefficient is such that X is the amount of displacement from the surface vertex in the optical axis direction, h is the height from the optical axis in the direction perpendicular to the optical axis, r is the paraxial radius of curvature, k is the conic constant, A4, A6, When A8, A10, A12... Are the aspheric coefficients of the respective orders,

で表す。なお、各非球面係数における「ｅ±ＸＸ」は「×１０±XX」を意味している。また前記条件式と各数値実施例との関係を表１に示す。 Represented by Note that “e ± XX” in each aspheric coefficient means “× 10 ± XX ”. Table 1 shows the relationship between the conditional expression and each numerical example.

［数値実施例１］
単位 mm

面データ
面番号 r d nd νd
1 161.255 1.80 1.84666 23.8
2 60.694 7.61 1.63854 55.4
3 465.001 0.15
4 57.365 5.44 1.80400 46.6
5 177.584 (可変)
6 77.712 1.30 1.83481 42.7
7 14.008 8.61
8* -55.042 1.20 1.85135 40.1
9* 35.356 0.15
10 34.002 6.46 1.85478 24.8
11 -28.709 0.21
12 -26.718 1.00 1.77250 49.6
13 -202.259 (可変)
14 51.200 2.40 1.59522 67.7
15 -91.988 (可変)
16 -44.756 0.80 1.91082 35.3
17 -222.920 (可変)
18(絞り) ∞ 0.70
19 20.057 1.05 1.84666 23.8
20 15.441 7.28 1.49700 81.5
21 -60.793 0.20
22* 47.809 2.95 1.58313 59.4
23 -83.627 (可変)
24 -56.404 3.28 1.84666 23.8
25 -15.362 0.80 1.76200 40.1
26 37.316 (可変)
27 -1372.861 2.59 1.60311 60.6
28 -44.084 0.15
29 92.250 8.14 1.48749 70.2
30 -16.466 1.30 1.80610 33.3
31 -76.131 (可変)
像面 ∞
[Numerical Example 1]
Unit mm

Surface data surface number rd nd νd
1 161.255 1.80 1.84666 23.8
2 60.694 7.61 1.63854 55.4
3 465.001 0.15
4 57.365 5.44 1.80 400 46.6
5 177.584 (variable)
6 77.712 1.30 1.83481 42.7
7 14.008 8.61
8 * -55.042 1.20 1.85135 40.1
9 * 35.356 0.15
10 34.002 6.46 1.85478 24.8
11 -28.709 0.21
12 -26.718 1.00 1.77250 49.6
13 -202.259 (variable)
14 51.200 2.40 1.59522 67.7
15 -91.988 (variable)
16 -44.756 0.80 1.91082 35.3
17 -222.920 (variable)
18 (Aperture) ∞ 0.70
19 20.057 1.05 1.84666 23.8
20 15.441 7.28 1.49700 81.5
21 -60.793 0.20
22 * 47.809 2.95 1.58313 59.4
23 -83.627 (variable)
24 -56.404 3.28 1.84666 23.8
25 -15.362 0.80 1.76200 40.1
26 37.316 (variable)
27 -1372.861 2.59 1.60311 60.6
28 -44.084 0.15
29 92.250 8.14 1.48749 70.2
30 -16.466 1.30 1.80610 33.3
31 -76.131 (variable)
Image plane ∞

非球面データ
第8面
K = 9.41904e+000 A 4= 1.09115e-005 A 6=-4.26769e-008
A 8= 1.19874e-011

第9面
K = 0.00000e+000 A 4=-7.00957e-006 A 6=-6.42162e-008

第22面
K = 7.47953e+000 A 4=-2.62547e-005 A 6=-2.56167e-008
A 8=-6.54406e-010 A10= 5.64855e-012 A12=-2.15921e-014
Aspheric data 8th surface
K = 9.41904e + 000 A 4 = 1.09115e-005 A 6 = -4.26769e-008
A 8 = 1.19874e-011

9th page
K = 0.00000e + 000 A 4 = -7.00957e-006 A 6 = -6.42162e-008

22nd page
K = 7.47953e + 000 A 4 = -2.62547e-005 A 6 = -2.56167e-008
A 8 = -6.54406e-010 A10 = 5.64855e-012 A12 = -2.15921e-014

各種データ
ズーム比 4.12
広角 中間 望遠
焦点距離 24.75 52.09 101.92
Fナンバー 3.60 4.81 5.83
半画角（度） 41.16 22.56 11.98
像高 21.64 21.64 21.64
レンズ全長 146.25 166.83 195.25
BF 38.99 58.34 73.70

d 5 1.00 15.68 34.52
d13 19.99 6.53 0.75
d15 3.65 5.50 7.50
d17 6.06 4.21 2.21
d23 3.38 5.55 7.17
d26 7.64 5.46 3.84
d31 38.99 58.34 73.70

ズームレンズ群データ
群 始面 焦点距離
1 1 99.63
2 6 -16.61
3 14 55.61
4 16 -61.61
5 18 22.97
6 24 -32.89
7 27 93.82
Various data Zoom ratio 4.12
Wide angle Medium Telephoto focal length 24.75 52.09 101.92
F number 3.60 4.81 5.83
Half angle of view (degrees) 41.16 22.56 11.98
Image height 21.64 21.64 21.64
Total lens length 146.25 166.83 195.25
BF 38.99 58.34 73.70

d 5 1.00 15.68 34.52
d13 19.99 6.53 0.75
d15 3.65 5.50 7.50
d17 6.06 4.21 2.21
d23 3.38 5.55 7.17
d26 7.64 5.46 3.84
d31 38.99 58.34 73.70

Zoom lens group data group Start surface Focal length
1 1 99.63
2 6 -16.61
3 14 55.61
4 16 -61.61
5 18 22.97
6 24 -32.89
7 27 93.82

［数値実施例２］
単位 mm

面データ
面番号 r d nd νd
1 125.294 2.40 1.85478 24.8
2 70.402 7.57 1.43875 94.9
3 4327.432 0.15
4 65.577 5.59 1.77250 49.6
5 204.816 (可変)
6* 59.060 1.20 1.85135 40.1
7 12.781 7.87
8 -43.049 1.00 1.83481 42.7
9 29.771 0.15
10 24.714 6.04 1.84666 23.8
11 -29.976 0.17
12 -27.155 1.00 1.77250 49.6
13 75.849 (可変)
14 44.670 3.27 1.49700 81.5
15 -35.005 (可変)
16 -30.876 0.80 1.88300 40.8
17 -114.729 (可変)
18(絞り) ∞ 1.70
19 21.199 1.00 2.00100 29.1
20 16.804 6.32 1.43875 94.9
21 -62.227 0.20
22* 42.403 3.04 1.55332 71.7
23 -79.400 (可変)
24 -59.654 2.57 1.87399 23.1
25 -20.600 0.90 1.81600 46.6
26 46.994 (可変)
27* 54.468 5.41 1.55332 71.7
28 -29.468 0.20
29 64.796 6.37 1.49700 81.5
30 -23.624 1.10 1.80610 33.3
31 -9190.640 (可変)
像面 ∞
[Numerical Example 2]
Unit mm

Surface data surface number rd nd νd
1 125.294 2.40 1.85478 24.8
2 70.402 7.57 1.43875 94.9
3 4327.432 0.15
4 65.577 5.59 1.77250 49.6
5 204.816 (variable)
6 * 59.060 1.20 1.85135 40.1
7 12.781 7.87
8 -43.049 1.00 1.83481 42.7
9 29.771 0.15
10 24.714 6.04 1.84666 23.8
11 -29.976 0.17
12 -27.155 1.00 1.77250 49.6
13 75.849 (variable)
14 44.670 3.27 1.49700 81.5
15 -35.005 (variable)
16 -30.876 0.80 1.88300 40.8
17 -114.729 (variable)
18 (Aperture) ∞ 1.70
19 21.199 1.00 2.00 100 29.1
20 16.804 6.32 1.43875 94.9
21 -62.227 0.20
22 * 42.403 3.04 1.55332 71.7
23 -79.400 (variable)
24 -59.654 2.57 1.87399 23.1
25 -20.600 0.90 1.81600 46.6
26 46.994 (variable)
27 * 54.468 5.41 1.55332 71.7
28 -29.468 0.20
29 64.796 6.37 1.49700 81.5
30 -23.624 1.10 1.80610 33.3
31 -9190.640 (variable)
Image plane ∞

非球面データ
第6面
K = 0.00000e+000 A 4= 7.61452e-006 A 6=-1.29841e-008
A 8=-6.85079e-011 A10= 4.04256e-013 A12=-7.04534e-016

第22面
K = 0.00000e+000 A 4=-1.25608e-005 A 6=-1.49455e-008
A 8= 1.73420e-012

第27面
K = 0.00000e+000 A 4=-7.25485e-006 A 6= 9.46293e-009
A 8=-2.26345e-011
Aspheric data 6th surface
K = 0.00000e + 000 A 4 = 7.61452e-006 A 6 = -1.29841e-008
A 8 = -6.85079e-011 A10 = 4.04256e-013 A12 = -7.04534e-016

22nd page
K = 0.00000e + 000 A 4 = -1.25608e-005 A 6 = -1.49455e-008
A 8 = 1.73420e-012

27th page
K = 0.00000e + 000 A 4 = -7.25485e-006 A 6 = 9.46293e-009
A 8 = -2.26345e-011

各種データ
ズーム比 6.81
広角 中間 望遠
焦点距離 15.40 22.95 104.92
Fナンバー 2.88 3.39 5.60
半画角（度） 41.57 30.76 7.42
像高 13.66 13.66 13.66
レンズ全長 149.46 154.42 222.88
BF 38.13 46.49 77.97

d 5 1.00 6.65 53.43
d13 19.81 10.76 0.96
d15 5.86 4.80 5.72
d17 1.84 2.89 1.98
d23 2.18 6.32 14.76
d26 14.63 10.49 2.05
d31 38.13 46.49 77.97

ズームレンズ群データ
群 始面 焦点距離
1 1 112.24
2 6 -11.48
3 14 40.03
4 16 -48.06
5 18 25.83
6 24 -33.79
7 27 39.79
Various data Zoom ratio 6.81
Wide angle Medium Telephoto focal length 15.40 22.95 104.92
F number 2.88 3.39 5.60
Half angle of view (degrees) 41.57 30.76 7.42
Image height 13.66 13.66 13.66
Total lens length 149.46 154.42 222.88
BF 38.13 46.49 77.97

d 5 1.00 6.65 53.43
d13 19.81 10.76 0.96
d15 5.86 4.80 5.72
d17 1.84 2.89 1.98
d23 2.18 6.32 14.76
d26 14.63 10.49 2.05
d31 38.13 46.49 77.97

Zoom lens group data group Start surface Focal length
1 1 112.24
2 6 -11.48
3 14 40.03
4 16 -48.06
5 18 25.83
6 24 -33.79
7 27 39.79

［数値実施例３］
単位 mm

面データ
面番号 r d nd νd
1 151.813 2.00 1.85478 24.8
2 68.860 8.31 1.53775 74.7
3 -1866.761 0.15
4 60.879 5.76 1.81600 46.6
5 165.878 (可変)
6* 67.767 1.20 1.85135 40.1
7 13.042 7.90
8 -35.637 1.20 1.83481 42.7
9 32.988 0.15
10 26.721 6.16 1.84666 23.8
11 -25.697 0.00
12 -24.016 1.00 1.77250 49.6
13 118.845 (可変)
14 95.484 1.20 1.48749 70.2
15 1742.962 0.20
16 60.798 2.30 1.59522 67.7
17 -45.290 (可変)
18 -33.935 0.70 1.88300 40.8
19 -1255.247 (可変)
20(絞り) ∞ 1.50
21 22.168 1.20 2.00069 25.5
22 17.862 5.60 1.43875 94.9
23 -47.621 0.20
24* 50.090 2.43 1.55332 71.7
25 -94.457 (可変)
26 -73.417 3.18 1.85026 32.3
27 -15.566 0.60 1.80400 46.6
28 64.378 (可変)
29* 52.300 4.48 1.55332 71.7
30 -30.737 0.20
31 605.260 4.98 1.51742 52.4
32 -20.182 1.00 1.80610 33.3
33 -193.514 (可変)
像面 ∞
[Numerical Example 3]
Unit mm

Surface data surface number rd nd νd
1 151.813 2.00 1.85478 24.8
2 68.860 8.31 1.53775 74.7
3 -1866.761 0.15
4 60.879 5.76 1.81600 46.6
5 165.878 (variable)
6 * 67.767 1.20 1.85135 40.1
7 13.042 7.90
8 -35.637 1.20 1.83481 42.7
9 32.988 0.15
10 26.721 6.16 1.84666 23.8
11 -25.697 0.00
12 -24.016 1.00 1.77250 49.6
13 118.845 (variable)
14 95.484 1.20 1.48749 70.2
15 1742.962 0.20
16 60.798 2.30 1.59522 67.7
17 -45.290 (variable)
18 -33.935 0.70 1.88300 40.8
19 -1255.247 (variable)
20 (Aperture) ∞ 1.50
21 22.168 1.20 2.00069 25.5
22 17.862 5.60 1.43875 94.9
23 -47.621 0.20
24 * 50.090 2.43 1.55332 71.7
25 -94.457 (variable)
26 -73.417 3.18 1.85026 32.3
27 -15.566 0.60 1.80 400 46.6
28 64.378 (variable)
29 * 52.300 4.48 1.55332 71.7
30 -30.737 0.20
31 605.260 4.98 1.51742 52.4
32 -20.182 1.00 1.80610 33.3
33 -193.514 (variable)
Image plane ∞

非球面データ
第6面
K = 0.00000e+000 A 4= 7.13225e-006 A 6=-7.99190e-009
A 8=-1.03269e-010 A10= 4.84921e-013 A12=-6.76467e-016

第24面
K = 0.00000e+000 A 4=-1.34147e-005 A 6=-1.93181e-008
A 8=-3.06029e-011

第29面
K = 0.00000e+000 A 4=-8.55841e-006 A 6= 9.30698e-009
A 8=-1.79882e-011
Aspheric data 6th surface
K = 0.00000e + 000 A 4 = 7.13225e-006 A 6 = -7.99 190e-009
A 8 = -1.03269e-010 A10 = 4.84921e-013 A12 = -6.76467e-016

24th page
K = 0.00000e + 000 A 4 = -1.34147e-005 A 6 = -1.93181e-008
A 8 = -3.06029e-011

29th page
K = 0.00000e + 000 A 4 = -8.55841e-006 A 6 = 9.30698e-009
A 8 = -1.79882e-011

各種データ
ズーム比 7.22
広角 中間 望遠
焦点距離 15.34 23.89 110.72
Fナンバー 3.48 3.88 5.60
半画角（度） 41.68 29.76 7.03
像高 13.66 13.66 13.66
レンズ全長 148.04 152.24 212.88
BF 35.67 45.27 72.93

d 5 1.00 6.28 49.87
d13 22.19 11.51 0.89
d17 4.81 4.43 5.64
d19 2.60 2.97 1.77
d25 1.98 7.17 16.34
d28 16.20 11.02 1.84
d33 35.67 45.27 72.93

ズームレンズ群データ
群 始面 焦点距離
1 1 100.51
2 6 -11.72
3 14 36.54
4 18 -39.51
5 20 26.26
6 26 -46.90
7 29 49.99
Various data Zoom ratio 7.22
Wide angle Medium telephoto focal length 15.34 23.89 110.72
F number 3.48 3.88 5.60
Half angle of view (degrees) 41.68 29.76 7.03
Image height 13.66 13.66 13.66
Total lens length 148.04 152.24 212.88
BF 35.67 45.27 72.93

d 5 1.00 6.28 49.87
d13 22.19 11.51 0.89
d17 4.81 4.43 5.64
d19 2.60 2.97 1.77
d25 1.98 7.17 16.34
d28 16.20 11.02 1.84
d33 35.67 45.27 72.93

Zoom lens group data group Start surface Focal length
1 1 100.51
2 6 -11.72
3 14 36.54
4 18 -39.51
5 20 26.26
6 26 -46.90
7 29 49.99

［数値実施例４］

単位 mm

面データ
面番号 r d nd νd
1 97.071 2.20 1.91082 35.3
2 55.614 8.21 1.49700 81.5
3 354.557 0.10
4 67.196 6.05 1.59522 67.7
5 1287.679 (可変)
6* 91.247 1.20 1.85135 40.1
7 16.669 8.29
8 -36.402 1.00 1.80400 46.6
9 122.794 0.15
10 39.761 6.15 1.78472 25.7
11 -36.281 0.80
12 -25.710 1.00 1.80400 46.6
13 143.363 1.59 1.80809 22.8
14 -204.317 (可変)
15(絞り) ∞ 1.00
16* 89.295 4.03 1.55332 71.7
17 -79.794 0.10
18 83.754 4.86 1.48749 70.2
19 -45.199 0.10
20 133.362 5.27 1.48749 70.2
21 -31.690 1.00 1.80518 25.4
22 -119.331 (可変)
23* -45.333 0.90 1.69350 53.2
24 32.811 2.41 1.72151 29.2
25 210.200 (可変)
26* 245.449 4.15 1.58313 59.4
27 -32.783 0.10
28 61.230 5.07 1.48749 70.2
29 -36.664 1.45
30 -31.390 1.00 1.88300 40.8
31 52.249 5.43 1.51742 52.4
32 -47.350 (可変)
33 -109.969 1.20 1.48749 70.2
34 862.824 (可変)
像面 ∞
[Numerical Example 4]

Unit mm

Surface data surface number rd nd νd
1 97.071 2.20 1.91082 35.3
2 55.614 8.21 1.49700 81.5
3 354.557 0.10
4 67.196 6.05 1.59522 67.7
5 1287.679 (variable)
6 * 91.247 1.20 1.85135 40.1
7 16.669 8.29
8 -36.402 1.00 1.80400 46.6
9 122.794 0.15
10 39.761 6.15 1.78472 25.7
11 -36.281 0.80
12 -25.710 1.00 1.80 400 46.6
13 143.363 1.59 1.80809 22.8
14 -204.317 (variable)
15 (Aperture) ∞ 1.00
16 * 89.295 4.03 1.55332 71.7
17 -79.794 0.10
18 83.754 4.86 1.48749 70.2
19 -45.199 0.10
20 133.362 5.27 1.48749 70.2
21 -31.690 1.00 1.80518 25.4
22 -119.331 (variable)
23 * -45.333 0.90 1.69350 53.2
24 32.811 2.41 1.72151 29.2
25 210.200 (variable)
26 * 245.449 4.15 1.58313 59.4
27 -32.783 0.10
28 61.230 5.07 1.48749 70.2
29 -36.664 1.45
30 -31.390 1.00 1.88300 40.8
31 52.249 5.43 1.51742 52.4
32 -47.350 (variable)
33 -109.969 1.20 1.48749 70.2
34 862.824 (variable)
Image plane ∞

非球面データ
第6面
K = 0.00000e+000 A 4= 2.28560e-006 A 6= 1.94249e-008
A 8=-1.04660e-010 A10= 1.79714e-013

第16面
K = 0.00000e+000 A 4=-2.30164e-006 A 6=-8.47712e-010
A 8= 1.41417e-011 A10=-3.21933e-014

第23面
K = 0.00000e+000 A 4= 2.66189e-006 A 6=-2.86074e-010
A 8=-4.88264e-011

第26面
K = 0.00000e+000 A 4=-4.47379e-006 A 6= 3.90667e-009
A 8= 3.12498e-011 A10=-2.21000e-013
Aspheric data 6th surface
K = 0.00000e + 000 A 4 = 2.28560e-006 A 6 = 1.94249e-008
A 8 = -1.04660e-010 A10 = 1.79714e-013

16th page
K = 0.00000e + 000 A 4 = -2.30164e-006 A 6 = -8.47712e-010
A 8 = 1.41417e-011 A10 = -3.21933e-014

23rd page
K = 0.00000e + 000 A 4 = 2.66189e-006 A 6 = -2.86074e-010
A 8 = -4.88264e-011

26th page
K = 0.00000e + 000 A 4 = -4.47379e-006 A 6 = 3.90667e-009
A 8 = 3.12498e-011 A10 = -2.21000e-013

各種データ
ズーム比 16.28
広角 中間 望遠
焦点距離 18.11 127.86 294.93
Fナンバー 3.39 4.45 5.80
半画角（度） 37.03 6.10 2.65
像高 13.66 13.66 13.66
レンズ全長 195.39 232.88 243.69
BF 36.07 54.33 50.66

d 5 2.16 55.27 71.46
d14 50.02 12.34 0.97
d22 3.48 27.55 29.00
d25 27.85 3.78 2.33
d32 1.00 4.80 14.45
d34 36.07 54.33 50.66

ズームレンズ群データ
群 始面 焦点距離
1 1 112.62
2 6 -16.26
3 15 34.12
4 23 -55.66
5 26 52.28
6 33 -200.00
Various data Zoom ratio 16.28
Wide angle Medium Telephoto focal length 18.11 127.86 294.93
F number 3.39 4.45 5.80
Half angle of view (degrees) 37.03 6.10 2.65
Image height 13.66 13.66 13.66
Total lens length 195.39 232.88 243.69
BF 36.07 54.33 50.66

d 5 2.16 55.27 71.46
d14 50.02 12.34 0.97
d22 3.48 27.55 29.00
d25 27.85 3.78 2.33
d32 1.00 4.80 14.45
d34 36.07 54.33 50.66

Zoom lens group data group Start surface Focal length
1 1 112.62
2 6 -16.26
3 15 34.12
4 23 -55.66
5 26 52.28
6 33 -200.00

Ｌ１…第１レンズ群 Ｌ２…第２レンズ群 Ｌ３…第３レンズ群
Ｌ４…第４レンズ群 Ｌ５…第５レンズ群 Ｌ６…第６レンズ群
Ｌ７…第７レンズ群 ｄ…ｄ線 ｇ…ｇ線
ΔＭ…メリディオナル像面 ΔＳ…サジタル像面
ＳＰ…絞り ＩＰ…結像面 L1 ... 1st lens group L2 ... 2nd lens group L3 ... 3rd lens group L4 ... 4th lens group L5 ... 5th lens group L6 ... 6th lens group L7 ... 7th lens group d ... d line g ... g line ΔM: Meridional image plane ΔS: Sagittal image plane SP: Aperture IP: Imaging plane

Claims (12)

物体側から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、負の屈折力の第６レンズ群、正の屈折力の第７レンズ群から構成され、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において、
フォーカシングに際して前記第３レンズ群と前記第４レンズ群の間隔が変化し、
前記第３レンズ群に含まれる正レンズの中で最も像側に配置された正レンズの材料のアッベ数をνｄ３ｐ、前記第２レンズ群の焦点距離をｆ２、前記第３レンズ群の焦点距離をｆ３、前記第４レンズ群の焦点距離をｆ４、広角端から望遠端へのズーミングにおける前記第１レンズ群の移動量をｍ１とするとき、
５０＜νｄ３ｐ＜１００
１．０＜｜ｆ４／ｆ３｜＜１．６５
０．１０＜｜ｆ２｜／ｍ１＜０．３５
なる条件式を満たす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. In a zoom lens that includes a fifth lens group having a positive refractive power, a sixth lens group having a negative refractive power, and a seventh lens group having a positive refractive power, and in which the distance between adjacent lens groups changes during zooming,
The distance between the third lens group and the fourth lens group changes during focusing,
Of the positive lenses included in the third lens group, the Abbe number of the material of the positive lens arranged closest to the image side is νd3p, the focal length of the second lens group is f2, and the focal length of the third lens group is f3, when the focal length of the fourth lens group is f4, and the amount of movement of the first lens group in zooming from the wide-angle end to the telephoto end is m1,
50 <νd3p <100
1.0 <| f4 / f3 | <1.65
0.10 <| f2 | / m1 <0.35
A zoom lens characterized by satisfying the following conditional expression: 前記第１レンズ群の焦点距離をｆ５、望遠端における全系の焦点距離をｆｔとするとき、
０．０５＜ｆ５／ｆｔ＜０．４５
なる条件式を満たす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 first lens group is f5 and the focal length of the entire system at the telephoto end is ft,
0.05 <f5 / ft <0.45
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. 前記第１レンズ群の焦点距離をｆ１、広角端における全系の焦点距離をｆｗとするとき、
２．０＜ｆ１／ｆｗ＜９．０
なる条件式を満たす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 focal length of the first lens group is f1, and the focal length of the entire system at the wide angle end is fw,
2.0 <f1 / fw <9.0
The zoom lens according to claim 1 , wherein the following conditional expression is satisfied. ０．４＜｜ｆ３×ｆ４｜１／２／ｆ５＜３．４
なる条件式を満たす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。 0.4 <| f3 × f4 | 1/2 /f5<3.4
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. 前記第４レンズ群は負レンズＧ４ｎを含む１つのレンズ成分から構成され、前記負レンズＧ４ｎの材料の屈折率をｎｄ４ｎ、前記負レンズＧ４ｎの材料のアッベ数をνｄ４ｎとするとき、
１．５２＜ｎｄ４ｎ＜２．１０
２５＜νｄ４ｎ＜７０
なる条件式を満たすことを特徴とする請求項１乃至４のいずれか１項に記載のズームレンズ。 The fourth lens group is composed of one lens component including a negative lens G4n. When the refractive index of the material of the negative lens G4n is nd4n and the Abbe number of the material of the negative lens G4n is νd4n,
1.52 <nd4n <2.10
25 <νd4n <70
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. フォーカシングに際して前記第４レンズ群が移動することを特徴とする請求項１乃至５のいずれか１項に記載のズームレンズ。 The zoom lens according to any one of claims 1 to 5 , wherein the fourth lens group moves during focusing. フォーカシングに際して前記第３レンズ群と前記第４レンズ群が移動することを特徴とする請求項１乃至５のいずれか１項に記載のズームレンズ。 The zoom lens according to any one of claims 1 to 5 , wherein the third lens group and the fourth lens group move during focusing. 前記第６レンズ群の焦点距離をｆ６とするとき、
１．０＜｜ｆ６｜／ｆｗ＜１４．０
なる条件式を満たすことを特徴とする請求項１乃至７のいずれか１項に記載のズームレンズ。 When the focal length of the sixth lens group is f6,
1.0 <| f6 | / fw <14.0
The zoom lens according to any one of claims 1 to 7, characterized by satisfying the following conditional expression. 物体側から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、負の屈折力の第６レンズ群、正の屈折力の第７レンズ群から構成され、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において、
フォーカシングに際して前記第３レンズ群と前記第４レンズ群の間隔が変化し、前記第３レンズ群に含まれる正レンズの中で最も像側に配置された正レンズの材料のアッベ数をνｄ３ｐとするとき、
５０＜νｄ３ｐ＜１００
なる条件式を満たす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. In a zoom lens that includes a fifth lens group having a positive refractive power, a sixth lens group having a negative refractive power, and a seventh lens group having a positive refractive power, and in which the distance between adjacent lens groups changes during zooming,
During focusing, the distance between the third lens group and the fourth lens group changes, and the Abbe number of the material of the positive lens arranged closest to the image among the positive lenses included in the third lens group is νd3p. When
50 <νd3p <100
A zoom lens characterized by satisfying the following conditional expression: フォーカシングに際して前記第４レンズ群が移動することを特徴とする請求項９に記載のズームレンズ。 The zoom lens according to claim 9 , wherein the fourth lens group moves during focusing. フォーカシングに際して前記第３レンズ群と前記第４レンズ群が移動することを特徴とする請求項９に記載のズームレンズ。 The zoom lens according to claim 9 , wherein the third lens group and the fourth lens group move during focusing. 請求項１乃至１１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 11, an imaging apparatus characterized by having an image pickup device which receives an image formed by the zoom lens.
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