JP6748774B2 - Zoom lens and imaging device having the same - Google Patents
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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、例えばスチルカメラ、ビデオカメラ、デジタルスチル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 suitable for an image pickup apparatus such as a still camera, a video camera, a digital still camera and a surveillance camera.
近年、撮像装置に用いる撮像光学系としてはレンズ全長が短く、全系が小型で、高ズーム比で、しかも高速なフォーカスが行えるようなフォーカシング方式を用いたズームレンズであることが要望されている。また、手ぶれ等による撮影画像のぶれ（像ぶれ）を補正し、光学性能の低下を防止する防振機能を有すること等が要望されている。従来、インナーフォーカス方式を用い、ズームレンズを構成する一部のレンズ群で像ぶれ補正を行ったズームレンズが知られている（特許文献１乃至３）。 In recent years, it has been demanded that an imaging optical system used in an imaging apparatus be a zoom lens using a focusing system that has a short overall lens length, a small overall system, a high zoom ratio, and high-speed focusing. .. Further, it is desired to have a vibration-proof function that corrects the blurring (image blurring) of a captured image due to camera shake or the like and prevents deterioration of optical performance. 2. Description of the Related Art Conventionally, there is known a zoom lens that uses an inner focus method and performs image blur correction with a part of lens groups included in the zoom lens (Patent Documents 1 to 3).
特許文献１では、物体側より像側へ順に、正、負、正、正、負の屈折力の第１レンズ群乃至第５レンズ群より構成され、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を開示している。特許文献１ではフォーカシングを第３レンズ群で行い、像ぶれ補正を第４レンズ群で行っている。 In Patent Document 1, in order from the object side to the image side, the first lens group to the fifth lens group having positive, negative, positive, positive, and negative refractive powers are formed, and the distance between adjacent lens groups changes during zooming. A zoom lens is disclosed. In Patent Document 1, focusing is performed by the third lens group, and image blur correction is performed by the fourth lens group.
特許文献２では、物体側から像側へ順に、正、負、正、正、正の屈折力の第１レンズ群乃至第５レンズ群より構成され、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を開示している。特許文献２ではフォーカシングを第３レンズ群で行い、像ぶれ補正を第４レンズ群で行っている。 In Patent Document 2, it is composed of first to fifth lens groups having positive, negative, positive, positive and positive refractive powers in order from the object side to the image side, and the distance between adjacent lens groups changes during zooming. A zoom lens is disclosed. In Patent Document 2, focusing is performed by the third lens group, and image blur correction is performed by the fourth lens group.
特許文献３では、物体側より像側へ順に、正、負、正、正の屈折力の第１レンズ群乃至第４レンズ群より構成され、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を開示している。特許文献３ではフォーカシングを第４レンズ群の一部で行い、像ぶれ補正を第３レンズ群の全部または一部で行っている。 According to Japanese Patent Laid-Open No. 2004-311,101, a zoom lens that is composed of first to fourth lens groups having positive, negative, positive, and positive refractive powers in order from the object side to the image side, and in which the distance between adjacent lens groups changes during zooming. Is disclosed. In Patent Document 3, focusing is performed by part of the fourth lens group, and image blur correction is performed by all or part of the third lens group.
ズームレンズにおいて、全系の小型化を図りつつ、高ズーム比で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こと、そして像ぶれ補正に際して高い光学性能を維持することが要求されている。 In a zoom lens, it is required to achieve high optical performance over the entire zoom range and overall object distance at a high zoom ratio while maintaining a high optical performance at the time of image blur correction while achieving downsizing of the entire system.
特に大きな、撮像素子を用いた撮像装置において、像ぶれ補正のための補正レンズ群を光軸と垂直方向に移動させる場合、移動機構の小型化、省電力化を図るために補正レンズ群が小型軽量であることが求められている。これらの要求を満足するには、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等）及び像ぶれ補正用のレンズ群の選定や、その屈折力等のレンズ構成を適切に設定することが重要になってくる。 In a particularly large image pickup device using an image sensor, when the correction lens group for image blur correction is moved in the direction perpendicular to the optical axis, the correction lens group is small in order to downsize the moving mechanism and save power. It is required to be lightweight. In order to satisfy these requirements, for example, the zoom type (the number of lens groups, the refractive power of each lens group, etc.) and the lens group for image blur correction are selected, and the lens configuration such as the refractive power is appropriately set. Becomes important.
本発明は、全系が小型で、高ズーム比で、しかも像ぶれ補正に際して高い光学性能を維持することが容易な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。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a zoom lens having a small overall system, a high zoom ratio, and easily maintaining high optical performance during image blur correction, and an image pickup apparatus having the zoom lens.
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、１つ以上のレンズ群を含み、全体として正の屈折力を有する後群から構成され、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であって、広角端から望遠端へのズーミングに際し、前記第１レンズ群と前記第２レンズ群の間隔は広がり、前記第２レンズ群と前記後群の間隔は狭まり、前記後群は前記後群の中で最も物体側に配置された、像ぶれ補正に際して光軸に対して垂直方向の成分を持つように移動する正の屈折力のレンズＰ１を有し、前記レンズＰ１の物体側のレンズ面の曲率半径をＲ１Ｐ１、前記レンズＰ１の像側のレンズ面の曲率半径をＲ２Ｐ１とし、レンズＰ１のシェープファクタＳＦＰ１を、
ＳＦＰ１＝（Ｒ２Ｐ１＋Ｒ１Ｐ１）／（Ｒ２Ｐ１−Ｒ１Ｐ１）
とするとき、
−２．５＜ＳＦＰ１＜−０．５
なる条件式を満たすことを特徴としている。
また、本発明の他のズームレンズは、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、１つ以上のレンズ群を含み、全体として正の屈折力を有する後群から構成され、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であって、広角端から望遠端へのズーミングに際し、前記第１レンズ群と前記第２レンズ群の間隔は広がり、前記第２レンズ群と前記後群の間隔は狭まり、前記後群は、像ぶれ補正に際して光軸に対して垂直方向の成分を持つように移動する正の屈折力のレンズＰ１を有し、前記レンズＰ１の物体側のレンズ面の曲率半径をＲ１Ｐ１、前記レンズＰ１の像側のレンズ面の曲率半径をＲ２Ｐ１、レンズＰ１のシェープファクタＳＦＰ１を、
ＳＦＰ１＝（Ｒ２Ｐ１＋Ｒ１Ｐ１）／（Ｒ２Ｐ１−Ｒ１Ｐ１）
とし、望遠端における前記レンズＰ１の横倍率をβＰｔ、望遠端における前記レンズＰ１より像側に配置された光学系の横倍率をβＲｔとするとき、
−２．５＜ＳＦＰ１＜−０．５
０．８４５≦（１−βＰｔ）×βＲｔ＜１．８
なる条件式を満たすことを特徴とする。
The zoom lens of the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and one or more lens groups, which are arranged in order from the object side to the image side, and have a positive refractive index as a whole. A zoom lens which is composed of a rear group having a refracting power of, and in which a distance between adjacent lens groups changes during zooming, the zoom lens including the first lens group and the second lens group when zooming from a wide-angle end to a telephoto end. The interval is widened, the interval between the second lens group and the rear group is narrowed, and the rear group is disposed on the most object side of the rear group and has a component in a direction perpendicular to the optical axis when correcting image blur. A lens P1 having a positive refracting power that moves so as to have is provided, the radius of curvature of the object side lens surface of the lens P1 is R1P1, the radius of curvature of the image side lens surface of the lens P1 is R2P1, and the lens P1 Shape factor SFP1
SFP1=(R2P1+R1P1)/(R2P1-R1P1)
When
-2.5<SFP1<-0.5
It is characterized by satisfying the following conditional expression.
Another zoom lens of the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and one or more lens groups, which are arranged in order from the object side to the image side. A zoom lens which is composed of a rear group having a positive refracting power as a whole, and in which a distance between adjacent lens groups changes during zooming, the zoom lens having the first lens group and the first lens group during zooming from a wide-angle end to a telephoto end. The distance between the two lens groups is widened, the distance between the second lens group and the rear group is narrowed, and the rear group moves so as to have a component in the direction perpendicular to the optical axis when correcting image blurring. R1P1, the radius of curvature of the object-side lens surface of the lens P1 is R1P1, the radius of curvature of the image-side lens surface of the lens P1 is R2P1, and the shape factor SFP1 of the lens P1 is
SFP1=(R2P1+R1P1)/(R2P1-R1P1)
When the lateral magnification of the lens P1 at the telephoto end is βPt and the lateral magnification of the optical system arranged on the image side of the lens P1 at the telephoto end is βRt,
-2.5<SFP1<-0.5
0.845≦(1-βPt)×βRt<1.8
It is characterized by satisfying the following conditional expression.
本発明によれば、全系が小型で、高ズーム比で、しかも像ぶれ補正に際して高い光学性能を維持することが容易なズームレンズが得られる。 According to the present invention, it is possible to obtain a zoom lens that has a small overall system, a high zoom ratio, and that can easily maintain high optical performance during image blur correction.
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次のレンズ群より構成されている。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Ｌ１、負の屈折力の第２レンズ群Ｌ２、１つ以上のレンズ群を含み全体として正の屈折力の後群ＬＲから構成されている。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The zoom lens of the present invention is composed of the following lens groups arranged in order from the object side to the image side. A first lens unit L1 having a positive refractive power (optical power=the reciprocal of the focal length), a second lens unit L2 having a negative refractive power, and a rear lens unit LR having a positive refractive power as a whole including one or more lens units. It consists of
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各レンズ群が移動する。また、各実施例のズームレンズは、後群ＬＲに含まれる正の屈折力のレンズＰ１を光軸に対して垂直方向の成分を持つように移動させることで像ぶれを補正することができるように構成されている。 During zooming, each lens group moves so that the distance between adjacent lens groups changes. Further, in the zoom lens of each embodiment, the image blur can be corrected by moving the lens P1 having a positive refractive power included in the rear group LR so as to have a component in the direction perpendicular to the optical axis. Is configured.
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。図３（Ａ）は実施例１のズームレンズの広角端と望遠端における横収差図、図３（Ｂ）は実施例１のズームレンズの広角端と望遠端における０．３度の像ぶれ補正を行ったときの横収差図である。実施例１はズーム比３．３４、開口比（Ｆナンバー）３．３０〜５．５０程度のズームレンズである。 1A, 1B, and 1C are lens cross-sectional views at a wide-angle end (short focal length end), an intermediate zoom position, and a telephoto end (long focal length end) of a zoom lens according to a first exemplary embodiment of the present invention. is there. 2A, 2B, and 2C are aberration diagrams of the zoom lens of Embodiment 1 at the wide-angle end, the intermediate zoom position, and the telephoto end. FIG. 3A is a lateral aberration diagram at the wide-angle end and the telephoto end of the zoom lens of Embodiment 1, and FIG. 3B is an image blur correction of 0.3 degree at the wide-angle end and the telephoto end of the zoom lens of Embodiment 1. It is a lateral-aberration figure at the time of performing. Example 1 is a zoom lens having a zoom ratio of 3.34 and an aperture ratio (F number) of about 3.30 to 5.50.
図４（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５（Ａ）、（Ｂ）、（Ｃ）は実施例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。図６（Ａ）は実施例２のズームレンズの広角端と望遠端における横収差図である。図６（Ｂ）は実施例２のズームレンズの広角端と望遠端における０．３度の像ぶれ補正を行ったときの横収差図である。実施例２はズーム比３．２５、開口比３．８４〜５．８４程度のズームレンズである。 4A, 4B, and 4C are lens cross-sectional views of the zoom lens according to the second exemplary embodiment of the present invention at the wide-angle end, the intermediate zoom position, and the telephoto end. 5A, 5B, and 5C are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens according to the second embodiment. FIG. 6A is a lateral aberration diagram at a wide-angle end and a telephoto end of the zoom lens according to the second exemplary embodiment. FIG. 6B is a lateral aberration diagram of the zoom lens according to the second exemplary embodiment at the wide-angle end and the telephoto end when image blur correction of 0.3 degree is performed. The second embodiment is a zoom lens having a zoom ratio of 3.25 and an aperture ratio of about 3.84 to 5.84.
図７（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８（Ａ）、（Ｂ）、（Ｃ）は実施例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。図９（Ａ）は実施例３のズームレンズの広角端と望遠端における横収差図である。図９（Ｂ）は実施例３のズームレンズの広角端と望遠端における０．３度の像ぶれ補正を行ったときの横収差図である。実施例３はズーム比２．８８、開口比４．１２〜５．７程度のズームレンズである。 7A, 7B, and 7C are lens cross-sectional views of the zoom lens according to the third exemplary embodiment of the present invention at the wide-angle end, the intermediate zoom position, and the telephoto end. FIGS. 8A, 8B, and 8C are aberration diagrams of the zoom lens of Example 3 at the wide-angle end, the intermediate zoom position, and the telephoto end. FIG. 9A is a lateral aberration diagram at a wide-angle end and a telephoto end of the zoom lens according to the third exemplary embodiment. FIG. 9B is a lateral aberration diagram of the zoom lens according to the third exemplary embodiment when image blur correction of 0.3 degrees at the wide-angle end and the telephoto end is performed. The third embodiment is a zoom lens having a zoom ratio of 2.88 and an aperture ratio of about 4.12 to 5.7.
図１０（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１１（Ａ）、（Ｂ）、（Ｃ）は実施例４のズームレンズの広角端、中間ズーム位置、望遠端における収差図である。図１２（Ａ）は実施例４のズームレンズの広角端と望遠端における横収差図である。図１２（Ｂ）は実施例４のズームレンズの広角端と望遠端における０．３度の像ぶれ補正を行ったときの横収差図である。実施例４はズーム比２．８７、開口比３．６４〜５．２９程度のズームレンズである。 10A, 10B, and 10C are lens cross-sectional views of the zoom lens according to the fourth exemplary embodiment of the present invention at the wide-angle end, the intermediate zoom position, and the telephoto end. 11A, 11B, and 11C are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens of the fourth embodiment. FIG. 12A is a lateral aberration diagram at a wide-angle end and a telephoto end of the zoom lens according to the fourth exemplary embodiment. FIG. 12B is a lateral aberration diagram of the zoom lens according to the fourth exemplary embodiment at the wide-angle end and the telephoto end when 0.3-degree image blur correction is performed. The fourth embodiment is a zoom lens having a zoom ratio of 2.87 and an aperture ratio of about 3.64 to 5.29.
図１３（Ａ）、（Ｂ）、（Ｃ）は本発明の実施例５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１４（Ａ）、（Ｂ）、（Ｃ）は実施例５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。図１５（Ａ）は実施例５のズームレンズの広角端と望遠端における横収差図である。図１５（Ｂ）は実施例５のズームレンズの広角端と望遠端における０．３度の像ぶれ補正を行ったときの横収差図である。実施例５はズーム比３．１７、開口比４．１２〜５．８２程度のズームレンズである。 13A, 13B, and 13C are lens cross-sectional views of the zoom lens according to the fifth exemplary embodiment of the present invention at the wide-angle end, the intermediate zoom position, and the telephoto end. 14A, 14B, and 14C are aberration diagrams of the zoom lens of the fifth embodiment at the wide-angle end, the intermediate zoom position, and the telephoto end. FIG. 15A is a lateral aberration diagram at a wide-angle end and a telephoto end of the zoom lens according to the fifth exemplary embodiment. FIG. 15B is a lateral aberration diagram of the zoom lens of Example 5 when the image blur correction is performed at the wide-angle end and the telephoto end by 0.3 degrees. The fifth embodiment is a zoom lens having a zoom ratio of 3.17 and an aperture ratio of about 4.12 to 5.82.
各実施例のズームレンズはビデオカメラ、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像光学系である。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。Ｌ１は正の屈折力の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群である。 The zoom lens of each embodiment is an image pickup optical system used in an image pickup apparatus such as a video camera, a digital still camera, a silver salt film camera, and a TV camera. The zoom lens of each embodiment can also be used as a projection optical system for a projection device (projector). In the lens cross-sectional view, the left side is the object side (front side), and the right side is the image side (rear side). Further, in the lens cross-sectional view, when i is the order of the lens groups from the object side, Li represents the i-th lens group. L1 is a first lens group having a positive refractive power, and L2 is a second lens group having a negative refractive power.
ＬＲは１つ以上の正の屈折力のレンズ群を配し、全体として正の屈折力の後群である。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。ＦＰは、フレアーカット絞りであり、不要光をカットしている。ＩＰは像面であり、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）の撮像面が置かれる。又、銀塩フィルム用カメラの撮影光学系として使用する際にはフィルム面に相当する感光面が置かれている。 The LR is a rear lens group which has one or more lens groups having a positive refractive power and which has a positive refractive power as a whole. SP is an aperture stop that determines (limits) a light flux with an open F number (Fno). FP is a flare cut diaphragm that cuts unnecessary light. IP is an image plane, and when used as a photographing optical system of a video camera or a digital still camera, an image plane of a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or a CMOS sensor is placed. Further, when it is used as a photographing optical system of a silver salt film camera, a photosensitive surface corresponding to the film surface is placed.
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の移動軌跡を示す。フォーカスに関する矢印は無限遠から近距離へのフォーカシングに際してのレンズ群の移動方向を示している。 The arrows indicate the loci of movement of the respective lens groups during zooming from the wide-angle end to the telephoto end. The arrow relating to the focus indicates the moving direction of the lens group when focusing from infinity to a short distance.
各実施例において、後群ＬＲは、物体側から像側へ順に配置された、正の屈折力の第３レンズ群Ｌ３、正の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５から構成されている。そして第３レンズ群Ｌ３は１枚の正レンズより構成され、正レンズは像ぶれ補正用のレンズＰ１である。この他、後群ＬＲは、物体側から像側へ順に配置された、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から構成されている。そして第３レンズ群Ｌ３は１枚の正レンズより構成され、正レンズは像ぶれ補正用のレンズＰ１である。 In each embodiment, the rear lens group LR includes a third lens unit L3 having a positive refractive power, a fourth lens unit L4 having a positive refractive power, and a fifth lens unit having a positive refractive power, which are sequentially arranged from the object side to the image side. It is composed of a lens unit L5. The third lens unit L3 is composed of one positive lens, and the positive lens is the image blur correcting lens P1. In addition, the rear group LR includes a third lens group L3 having a positive refractive power, a fourth lens group L4 having a negative refractive power, and a fifth lens group having a positive refractive power, which are sequentially arranged from the object side to the image side. It is composed of L5. The third lens unit L3 is composed of one positive lens, and the positive lens is the image blur correcting lens P1.
この他、後群ＬＲは、物体側から像側へ順に配置された、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から構成されている。第３レンズ群Ｌ３は最も物体側に配置された正レンズＰ１を含む複数のレンズから構成されており、正レンズＰ１は像ぶれ補正用のレンズである。このように各実施例では後群ＬＲは１つ以上のレンズ群のうち最も物体側に配置された正の屈折力の第３レンズ群Ｌ３を有する。 In addition, the rear group LR includes a third lens group L3 having a positive refractive power, a fourth lens group L4 having a negative refractive power, and a fifth lens group having a positive refractive power, which are sequentially arranged from the object side to the image side. It is composed of L5. The third lens group L3 is composed of a plurality of lenses including the positive lens P1 arranged closest to the object side, and the positive lens P1 is a lens for image blur correction. As described above, in each embodiment, the rear lens group LR includes the third lens unit L3 having a positive refractive power, which is arranged closest to the object side among the one or more lens units.
図１の実施例１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は正の屈折力の第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は第３レンズ群Ｌ３、第４レンズ群Ｌ４、第５レンズ群Ｌ５から構成されている。 In Example 1 of FIG. 1, 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 positive refractive power. Is a fourth lens unit, and L5 is a fifth lens unit having a positive refractive power. The rear lens group LR includes a third lens group L3, a fourth lens group L4, and a fifth lens group L5.
実施例１のズームレンズは、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は物体側に単調移動している。第２レンズ群Ｌ２乃至第５レンズ群Ｌ５は物体側へ移している。そして広角端に比べ望遠端での第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広く、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔が狭くなるように移動している。実施例１では、像ぶれ補正に際して第３レンズ群Ｌ３は光軸に対して垂直方向の成分を持つように移動する。即ち第３レンズ群Ｌ３は単一のレンズよりなる像ぶれ補正用のレンズＰ１であり、像位置の補正を行っている。
In the zoom lens of Example 1, the first lens unit L1 monotonically moves toward the object side during zooming from the wide-angle end to the telephoto end. The second lens unit L2 to the fifth lens unit L5 are moved to the object side. The distance between the first lens unit L1 and the second lens unit L2 at the telephoto end is wider than that at the wide-angle end, and the distance between the second lens unit L2 and the third lens unit L3 is narrower. In the first embodiment, the third lens unit L3 moves so as to have a component in the direction perpendicular to the optical axis during image blur correction. That is, the third lens unit L3 is a single lens P1 for image blur correction, and corrects the image position.
実施例１では、第３レンズ群Ｌ３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は各々無限遠と近距離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から近距離へのフォーカスを行う場合には、矢印３ｃに示すように第３レンズ群Ｌ３を後方へ繰り込むことで行っている。 In the first embodiment, the focusing is performed by moving the third lens unit L3 on the optical axis. The solid curve 3a and the dotted curve 3b of the third lens unit L3 are for correcting the image plane variation during zooming from the wide-angle end to the telephoto end zoom position when focusing on infinity and short distance, respectively. Is the movement trajectory of. Further, when focusing from infinity to a short distance at the zoom position at the telephoto end, the third lens unit L3 is moved backward as shown by an arrow 3c.
図４の実施例２および図７の実施例３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レンズ群である。後群ＬＲは第３レンズ群Ｌ３、第４レンズ群Ｌ４、第５レンズ群Ｌ５から構成されている。 In Example 2 of FIG. 4 and Example 3 of FIG. 7, L1 is the first lens group having positive refractive power, L2 is the second lens group having negative refractive power, L3 is the third lens group having positive refractive power, and 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 lens group LR includes a third lens group L3, a fourth lens group L4, and a fifth lens group L5.
実施例２、３のズームレンズは、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は物体側に単調移動している。第２レンズ群Ｌ２乃至第５レンズ群Ｌ５は物体側へ移動している。そして広角端に比べ望遠端での第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広く、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔が狭くなるように移動している。実施例２、３では、像ぶれ補正に際して第３レンズ群Ｌ３は光軸に対して垂直方向の成分を持つように移動する。第３レンズ群Ｌ３は単一のレンズよりなる像ぶれ補正用のレンズＰ１である。 In the zoom lenses of Examples 2 and 3, the first lens unit L1 monotonically moves toward the object side during zooming from the wide-angle end to the telephoto end. The second lens unit L2 to the fifth lens unit L5 move to the object side. The distance between the first lens unit L1 and the second lens unit L2 at the telephoto end is wider than that at the wide-angle end, and the distance between the second lens unit L2 and the third lens unit L3 is narrower. In Embodiments 2 and 3, the third lens unit L3 moves so as to have a component in the direction perpendicular to the optical axis during image blur correction. The third lens unit L3 is the image blur correcting lens P1 formed of a single lens.
実施例２、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は各々無限遠と近距離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から近距離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 Examples 2 and 3, the fourth lens unit L4 is moved on the optical axis for focusing. The solid curve 4a and the dotted curve 4b of the fourth lens unit L4 are for correcting the image plane variation during zooming from the wide-angle end to the telephoto end zoom position when focusing on infinity and short distance, respectively. Is the movement trajectory of. Further, when focusing from infinity to a short distance at the zoom position at the telephoto end, the fourth lens unit L4 is moved forward as shown by an arrow 4c.
図１０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レンズ群である。後群ＬＲは第３レンズ群Ｌ３、第４レンズ群Ｌ４、第５レンズ群Ｌ５から構成されている。 In Example 4 of FIG. 10, 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 second lens group having a negative refractive power. The fourth lens unit L5 is a fifth lens unit L5 having a positive refractive power. The rear lens group LR includes a third lens group L3, a fourth lens group L4, and a fifth lens group L5.
実施例４のズームレンズは、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は物体側に単調移動している。第２レンズ群Ｌ２乃至第５レンズ群Ｌ５は物体側へ移動している。広角端に比べ望遠端での第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広く、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔が狭く、第３レンズ群Ｌ３と第４レンズ群Ｌ４の間隔が狭く、第４レンズ群Ｌ４と第５レンズ群Ｌ５の間隔が広くなるように移動している。 In the zoom lens of Embodiment 4, the first lens unit L1 monotonically moves toward the object side during zooming from the wide-angle end to the telephoto end. The second lens unit L2 to the fifth lens unit L5 move to the object side. The distance between the first lens unit L1 and the second lens unit L2 is wider at the telephoto end than at the wide angle end, the distance between the second lens unit L2 and the third lens unit L3 is narrow, and the third lens unit L3 and the fourth lens The lens unit L4 is moved so that the distance between the lens unit L4 is narrow and the distance between the fourth lens unit L4 and the fifth lens unit L5 is wide.
実施例４では、第３レンズ群Ｌ３は複数のレンズから構成され、像ぶれ補正に際して第３レンズ群Ｌ３の最も物体側の正レンズＰ１は光軸に対して垂直方向の成分を持つように移動する。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は各々無限遠と近距離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から近距離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を後方へ繰り込むことで行っている。 In the fourth embodiment, the third lens unit L3 is composed of a plurality of lenses, and the positive lens P1 closest to the object side of the third lens unit L3 is moved so as to have a component in the direction perpendicular to the optical axis during image blur correction. To do. In the fourth embodiment, focusing is performed by moving the fourth lens unit L4 on the optical axis. The solid curve 4a and the dotted curve 4b of the fourth lens unit L4 are for correcting the image plane variation during zooming from the wide-angle end to the telephoto end zoom position when focusing on infinity and short distance, respectively. Is the movement trajectory of. Further, when focusing from infinity to a short distance at the zoom position at the telephoto end, the fourth lens unit L4 is moved backward as shown by an arrow 4c.
図１３の実施例５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は第３レンズ群Ｌ３、第４レンズ群Ｌ４、第５レンズ群Ｌ５から構成されている。 In Example 5 of FIG. 13, 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. Is a fourth lens unit, and L5 is a fifth lens unit having a positive refractive power. The rear lens group LR includes a third lens group L3, a fourth lens group L4, and a fifth lens group L5.
実施例５のズームレンズは、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は物体側に単調移動している。第２レンズ群Ｌ２乃至第５レンズ群Ｌ５は物体側へ移動している。そして広角端に比べ望遠端での第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広く、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔が狭くなるように移動している。実施例５では、像ぶれ補正に際して第３レンズ群Ｌ３は光軸に対して垂直方向の成分を持つように移動する。第３レンズ群Ｌ３は単一のレンズよりなる像ぶれ補正用のレンズＰ１である。実施例５において、フォーカシング方式は実施例１と同じである。 In the zoom lens of Embodiment 5, the first lens unit L1 monotonically moves toward the object side during zooming from the wide-angle end to the telephoto end. The second lens unit L2 to the fifth lens unit L5 move to the object side. The distance between the first lens unit L1 and the second lens unit L2 at the telephoto end is wider than that at the wide-angle end, and the distance between the second lens unit L2 and the third lens unit L3 is narrower. In the fifth embodiment, the third lens unit L3 moves so as to have a component in the direction perpendicular to the optical axis during image blur correction. The third lens unit L3 is the image blur correcting lens P1 formed of a single lens. The focusing method in the fifth embodiment is the same as that in the first embodiment.
収差図においてＦｎｏはＦナンバー、ωは半画角（度）であり、光線追跡値による画角である。球面収差図において、ｄはｄ線（波長５８７．５６ｎｍ）、ｇはｇ線（波長４３５．８３５ｎｍ）である。 In the aberration diagram, Fno is an F number, ω is a half angle of view (degree), which is an angle of view based on a ray tracing value. In the spherical aberration diagram, d is the d line (wavelength 587.56 nm) and g is the g line (wavelength 435.835 nm).
非点収差図においてΔＳはｄ線におけるサジタル像面、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ｇはｇ線である。また、横収差図において、図面上から下へ順に像高１０ｍｍ、０ｍｍ、−１０ｍｍを示し、ΔＳはｄ線におけるサジタル断面の収差、ΔＭはｄ線におけるメリディオナル断面の収差を示している。 In the astigmatism diagram, ΔS is the sagittal image plane at the d line, and ΔM is the meridional image plane at the d line. The distortion aberration is shown for the d line. In the lateral chromatic aberration diagram, g is the g line. Further, in the lateral aberration diagram, image heights of 10 mm, 0 mm, and −10 mm are shown in order from the top to the bottom of the drawing, ΔS indicates the aberration of the sagittal section at the d line, and ΔM indicates the aberration of the meridional section at the d line.
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 each of the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the lens group for zooming is located at both ends of the range that is mechanically movable on the optical axis.
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Ｌ１、負の屈折力の第２レンズ群Ｌ２、１つ以上のレンズ群を含み、全体として正の屈折力の後群ＬＲから構成されている。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。後群ＬＲは像ぶれ補正に際して光軸に対して垂直方向の成分を持つように移動する正の屈折力のレンズＰ１を有する。 The zoom lens of the present invention includes a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, and one or more lens units, which are sequentially arranged from the object side to the image side, As a rear lens group LR having a positive refractive power. During zooming, the distance between adjacent lens groups changes. The rear lens group LR has a lens P1 having a positive refractive power that moves so as to have a component in the direction perpendicular to the optical axis during image blur correction.
レンズＰ１の物体側のレンズ面の曲率半径をＲ１Ｐ１、レンズＰ１の像側のレンズ面の曲率半径をＲ２Ｐ１とする（但しレンズ面の曲率半径はレンズ面が非球面形状の場合は、近軸曲率半径（基準となる２次曲面の半径）である。）。レンズＰ１のシェープファクタＳＦＰ１を、
ＳＦＰ１＝（Ｒ２Ｐ１＋Ｒ１Ｐ１）／（Ｒ２Ｐ１−Ｒ１Ｐ１）
とする。このとき、
−２．５＜ＳＦＰ１＜−０．５
なる条件式を満たす。
The radius of curvature of the object-side lens surface of the lens P1 is R1P1, and the radius of curvature of the image-side lens surface of the lens P1 is R2P1 (however, the radius of curvature of the lens surface is a paraxial curvature when the lens surface is aspherical). Radius (radius of the quadric surface used as a reference). The shape factor SFP1 of the lens P1 is
SFP1=(R2P1+R1P1)/(R2P1-R1P1)
And At this time,
-2.5<SFP1<-0.5
Satisfies the following conditional expression.
広角端におけるレンズ全長の短縮を図りつつ、ズーム全域に渡り諸収差を良好に補正するために、物体側から像側へ順に、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、および全体として正の屈折力の後群ＬＲからなるレンズ構成とした。少なくとも３つのレンズ群を有する構成とすることで、第１レンズ群Ｌ１および第２レンズ群Ｌ２で発生する球面収差やコマ収差等の諸収差を効果的に補正している。 In order to satisfactorily correct various aberrations over the entire zoom range while shortening the overall lens length at the wide-angle end, in order from the object side to the image side, the first lens unit L1 having a positive refractive power and the first lens unit L1 having a negative refractive power are arranged in order. The lens configuration is composed of two lens units L2 and the rear lens unit LR having a positive refractive power as a whole. By having at least three lens groups, various aberrations such as spherical aberration and coma that occur in the first lens group L1 and the second lens group L2 are effectively corrected.
また、全系の小型化と高ズーム比を図るために、広角端に比べ望遠端での第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広く、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔が狭くなるように各レンズ群の間隔を変化させてズーミングを行っている。全体として正の屈折力の後群ＬＲ中に開口絞りＳＰを設け、開口絞りＳＰに隣接して正の屈折力のレンズＰ１を配している。そして像ぶれを正の屈折力のレンズＰ１（補正レンズ群）を光軸に対して垂直方向の成分を持つように移動することで補正している。これによって、レンズＰ１の少ない移動量で大きな像ぶれの補正を行うようにしている。 Further, in order to reduce the size of the entire system and achieve a high zoom ratio, the distance between the first lens unit L1 and the second lens unit L2 at the telephoto end is wider than at the wide-angle end, and the second lens unit L2 and the third lens unit Zooming is performed by changing the distance between the lens groups so that the distance between the lens groups L3 becomes narrow. An aperture stop SP is provided in the rear lens group LR having a positive refracting power as a whole, and a lens P1 having a positive refracting power is arranged adjacent to the aperture stop SP. The image blur is corrected by moving the lens P1 (correction lens group) having a positive refractive power so as to have a component in the direction perpendicular to the optical axis. Thereby, a large amount of image blur is corrected with a small amount of movement of the lens P1.
条件式（１）は、レンズＰ１のシェープファクタを規定し、主に像ぶれの補正を行った際の偏芯収差を軽減し、光学性能を良好に維持するためのものである。条件式（１）の上限を超えると、レンズＰ１が偏芯した際、偏芯コマ収差は良好に補正できるが、偏芯片ボケが大きくなり、高い結像性能を確保することが難しくなり、好ましくない。条件式（１）の下限を超えると、偏芯片ボケや偏芯非点収差は良好に補正できるが、偏芯コマ収差を軽減することが難しく、像ぶれ補正の際に像を所定量シフトするために必要な移動量を確保しつつ、全系の小型化を図ることが困難となる。 Conditional expression (1) defines the shape factor of the lens P1, mainly reduces eccentric aberration when image blur is corrected, and maintains good optical performance. When the value exceeds the upper limit of the conditional expression (1), when the lens P1 is decentered, decentering coma aberration can be corrected well, but decentering piece blur becomes large, and it becomes difficult to secure high imaging performance, which is preferable. Absent. If the lower limit of conditional expression (1) is exceeded, decentering piece blurring and decentering astigmatism can be corrected well, but decentering coma aberration is difficult to reduce, and the image is shifted by a predetermined amount during image blur correction. Therefore, it is difficult to reduce the size of the entire system while securing the necessary movement amount.
像ぶれ補正のための補正レンズの小型軽量化を図り、かつ全系のレンズ枚数を削減するために、後群ＬＲ中の正の屈折力のレンズＰ１にて像ぶれ補正を行っている。また、像ぶれ補正のための補正レンズのレンズ構成を最小限とするために、補正レンズを正の屈折力の１つのレンズＰ１で構成している。 In order to reduce the size and weight of a correction lens for image blur correction and reduce the number of lenses in the entire system, image blur correction is performed by a lens P1 having a positive refractive power in the rear lens group LR. Further, in order to minimize the lens configuration of the correction lens for image blur correction, the correction lens is configured by one lens P1 having a positive refractive power.
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。
−２．１＜ＳＦＰ１＜−０．６ ・・・（１ａ）
条件式（１ａ）を満たすことにより、広角端においてレンズＰ１の偏芯コマ敏感度を軽減することができ、高い結像性能を確保することが容易となる。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。
−１．６＜ＳＦＰ１＜−０．７ ・・・（１ｂ）
In each embodiment, it is more preferable to set the numerical range of conditional expression (1) as follows.
-2.1<SFP1<-0.6 (1a)
By satisfying the conditional expression (1a), it is possible to reduce the decentering coma sensitivity of the lens P1 at the wide-angle end, and it becomes easy to secure high imaging performance. More preferably, the numerical range of conditional expression (1a) should be set as follows.
-1.6<SFP1<-0.7 (1b)
以上のように各レンズ群の構成を適切にし、条件式（１）を満たすことにより、ズーム全域で高い結像性能を有した高ズーム比で全系が小型なズームレンズが得られる。更に像ぶれ補正用のレンズＰ１の小型軽量化が容易になる。 As described above, by appropriately setting the configuration of each lens group and satisfying conditional expression (1), it is possible to obtain a zoom lens having a high zoom ratio and a small entire system, which has a high imaging performance in the entire zoom range. Further, it becomes easy to reduce the size and weight of the image blur correcting lens P1.
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。広角端における第２レンズ群Ｌ２からレンズＰ１までの合成系の横倍率をβｓｗ、望遠端における第２レンズ群Ｌ２からレンズＰ１までの合成系の横倍率をβｓｔとする。広角端における第２レンズ群Ｌ２と第３レンズ群Ｌ３の光軸上の間隔をＤ２３ｗ、望遠端における第２レンズ群Ｌ２と第３レンズ群Ｌ３の光軸上の間隔をＤ２３ｔとする。 In each embodiment, it is more preferable to satisfy at least one of the following conditional expressions. The lateral magnification of the combined system from the second lens group L2 to the lens P1 at the wide-angle end is βsw, and the lateral magnification of the combined system from the second lens group L2 to the lens P1 at the telephoto end is βst. The distance between the second lens unit L2 and the third lens unit L3 on the optical axis at the wide-angle end is D23w, and the distance between the second lens unit L2 and the third lens unit L3 at the telephoto end is D23t.
広角端におけるレンズＰ１の横倍率をβＰｗとする。レンズＰ１の焦点距離をｆＰ、望遠端における後群ＬＲの焦点距離をｆＲｔとする。広角端における全系の焦点距離をｆｗとする。望遠端におけるレンズＰ１の横倍率をβＰｔ、望遠端におけるレンズＰ１より像側に配置された光学系の横倍率をβＲｔとする。レンズＰ１の材料のｄ線における屈折率とアッベ数を各々ｎＰ、νＰとする。 The lateral magnification of the lens P1 at the wide-angle end is βPw. The focal length of the lens P1 is fP, and the focal length of the rear group LR at the telephoto end is fRt. The focal length of the entire system at the wide-angle end is fw. The lateral magnification of the lens P1 at the telephoto end is βPt, and the lateral magnification of the optical system arranged on the image side of the lens P1 at the telephoto end is βRt. The refractive index and the Abbe number at the d-line of the material of the lens P1 are nP and νP, respectively.
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。
０．０１＜βｓｔ／βｓｗ＜３．２０ ・・・（２）
１．８＜Ｄ２３ｗ／Ｄ２３ｔ＜２０．０ ・・・（３）
１．０＜｜１−βＰｗ｜＜２５．０ ・・・（４）
１．１＜ｆＰ／ｆＲｔ＜４．８ ・・・（５）
０．７＜ｆＲｔ／ｆｗ＜２．０ ・・・（６）
０．５＜（１−βＰｔ）×βＲｔ＜１．８・・・（７）
１．４５＜ｎＰ＜１．７５ ・・・（８）
４５．０＜νＰ＜１００．０ ・・・（９）
At this time, it is preferable to satisfy at least one of the following conditional expressions.
0.01<βst/βsw<3.20 (2)
1.8<D23w/D23t<20.0 (3)
1.0<|1-βPw|<25.0 (4)
1.1<fP/fRt<4.8 (5)
0.7<fRt/fw<2.0 (6)
0.5<(1-βPt)×βRt<1.8 (7)
1.45<nP<1.75 (8)
45.0<νP<100.0 (9)
なお、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。
The Abbe's number νd of the material is defined as Nd, NF, and NC, which are the refractive indices of the Fraunhofer line at d line, F line, and C line, respectively.
νd=(Nd-1)/(NF-NC)
Is defined by
次に前述の各条件式の技術的意味について説明する。条件式（２）は、第２レンズ群Ｌ２からレンズＰ１までの合成系におけるズーミングに際しての横倍率の変化に係る。条件式（２）は第２レンズ群Ｌ２の変倍効果を適正にし、レンズＰ１による像ぶれ補正時の光学性能を良好に維持するためのものである。条件式（２）の上限を超えて、望遠端での変倍分担が大きくなると、望遠端において変倍効果を得るのが容易となるが、像ぶれ補正時の光学性能を良好に維持すること、特に偏芯コマ収差を軽減することが難しくなり、好ましくない。 Next, the technical meanings of the above conditional expressions will be described. Conditional expression (2) relates to a change in lateral magnification during zooming in the combined system from the second lens unit L2 to the lens P1. Conditional expression (2) is for making the zooming effect of the second lens unit L2 appropriate and maintaining good optical performance at the time of image blur correction by the lens P1. If the upper limit of conditional expression (2) is exceeded and the variable-magnification share at the telephoto end becomes large, it becomes easy to obtain a variable-magnification effect at the telephoto end, but good optical performance during image blur correction must be maintained. Especially, it becomes difficult to reduce the eccentric coma aberration, which is not preferable.
条件式（２）の下限を超えると、レンズ系全体で所望のズーム比を得るのが困難となる、もしくは他のレンズ群に大きな変倍効果を負担することとなり、望遠端でのレンズ全長が長くなり全系の小型化が困難となる。 If the lower limit of conditional expression (2) is exceeded, it will be difficult to obtain a desired zoom ratio for the entire lens system, or a large zooming effect will be imposed on the other lens groups, and the total lens length at the telephoto end will increase. It becomes longer and it becomes difficult to downsize the whole system.
条件式（３）は、広角端と望遠端とにおける第２レンズ群Ｌ２と第３レンズ群Ｌ３との光軸上の空気間隔比の適切な範囲を規定している。条件式（３）の下限を超えると、望遠端においてレンズ全長が長くなり、前玉有効径が増大し、また望遠端において球面収差が補正不足になってくるので好ましくない。 Conditional expression (3) defines an appropriate range of the air gap ratio on the optical axis between the second lens unit L2 and the third lens unit L3 at the wide-angle end and the telephoto end. If the lower limit of conditional expression (3) is exceeded, the total lens length becomes long at the telephoto end, the effective diameter of the front lens increases, and spherical aberration is undercorrected at the telephoto end, which is not preferable.
更に、ズーミングにおける後群ＬＲの変倍分担が大きくなり、後群ＬＲの製造誤差に対する球面収差やコマ収差の敏感度が高くなり、高ズーム比化を図ることが難しくなる。条件式（３）の上限を超えると、ズーミングにおける各レンズ群の収差補正分担の均等化が困難になり、ズーミングに際して像面湾曲の変動を軽減するのが難しくなる。また、望遠側において像面湾曲が負側に増大し、または広角側において下線光束によるフレアが大きく発生するので、好ましくない。 Further, the zooming of the rear lens group LR is increased in zooming, the sensitivity of spherical aberration and coma aberration to the manufacturing error of the rear lens group LR becomes high, and it becomes difficult to achieve a high zoom ratio. If the upper limit of conditional expression (3) is exceeded, it will be difficult to evenly share the aberration correction of each lens unit during zooming, and it will be difficult to reduce the fluctuation of the field curvature during zooming. Further, the curvature of field increases to the negative side on the telephoto side, or flare due to the underlined light beam largely occurs on the wide angle side, which is not preferable.
条件式（４）は、像ぶれ補正用のレンズＰ１の広角端における横倍率を規定している。条件式（４）の上限を超えると、レンズＰ１を光軸に対して垂直方向の成分を持つように所定量の偏芯させた際の像の移動量が小さくなり、像ぶれに対する像変位の補正をした際の移動量が大きくなり、全系の小型化が困難となる。条件式（４）の下限を超えると、レンズＰ１の偏心敏感度が高くなり、レンズＰ１を光軸に対して垂直方向の成分を持つように所定量の偏芯させた際、偏芯像面湾曲が大きくなり、好ましくない。 Conditional expression (4) defines the lateral magnification at the wide-angle end of the image blur correcting lens P1. If the upper limit of conditional expression (4) is exceeded, the amount of image movement when the lens P1 is decentered by a predetermined amount so as to have a component in the direction perpendicular to the optical axis becomes small, and the image displacement due to image blurring is reduced. The amount of movement at the time of correction becomes large, which makes it difficult to downsize the entire system. If the lower limit of conditional expression (4) is exceeded, the decentering sensitivity of the lens P1 becomes high. When the lens P1 is decentered by a predetermined amount so as to have a component in the direction perpendicular to the optical axis, the decentered image plane The curvature becomes large, which is not preferable.
条件式（５）は像ぶれ補正に際して光軸に対して垂直方向の成分を持つように移動させるレンズＰ１の焦点距離を望遠端における後群ＬＲの焦点距離で規定している。条件式（５）は像ぶれの補正に対する諸収差、特に望遠側において偏芯コマ収差を良好に補正するためのものである。また、レンズＰ１の光束収斂性により、後群ＬＲのレンズ有効径の小型化を容易にするものである。 Conditional expression (5) defines the focal length of the lens P1 that is moved so as to have a component in the direction perpendicular to the optical axis when correcting the image blur, by the focal length of the rear group LR at the telephoto end. Conditional expression (5) is for satisfactorily correcting various aberrations for image blur correction, especially eccentric coma on the telephoto side. Further, the light beam convergence of the lens P1 facilitates the reduction of the lens effective diameter of the rear group LR.
条件式（５）の上限を超えるとレンズＰ１の正の屈折力が弱くなり、像シフト敏感度が低くなり、像ぶれ補正の際のレンズＰ１の変位量が増大し、好ましくない。 If the upper limit of conditional expression (5) is exceeded, the positive refractive power of the lens P1 becomes weak, the image shift sensitivity becomes low, and the displacement amount of the lens P1 at the time of image blur correction increases, which is not preferable.
ここで、像シフト敏感度ＴＳとは、シフトレンズを光軸に対して垂直方向に移動させたときのシフトレンズの垂直方向の移動量ΔＬとそのときの像面での像（結像位置）の光軸に対して垂直方向の移動量ΔＩの比
ＴＳ＝ΔＩ／ΔＬ
である。条件式（５）の下限を越えるとレンズＰ１の正の屈折力が強くなりすぎ、所定の長さのバックフォーカスを確保するのが難しくなり、好ましくない。
Here, the image shift sensitivity TS is the vertical shift amount ΔL of the shift lens when the shift lens is moved in the direction perpendicular to the optical axis and the image (image forming position) on the image plane at that time. Ratio of movement amount ΔI in the direction perpendicular to the optical axis of TS=ΔI/ΔL
Is. If the lower limit of conditional expression (5) is exceeded, the positive refractive power of the lens P1 becomes too strong, and it becomes difficult to secure a back focus of a predetermined length, which is not preferable.
条件式（６）は、望遠端における後群ＬＲの焦点距離と広角端における全系の焦点距離の比を規定し、主に球面収差やコマ収差等の諸収差を良好に補正しつつ広角端におけるレンズ全長の短縮化を図るためのものである。条件式（６）の上限を超えると、後群ＬＲの正の屈折力が弱くなりすぎ、変倍に必要な後群ＬＲに含まれるレンズ群の移動量が大きくなり、好ましくない。また、広角端におけるレンズ全長が増大する傾向があり、好ましくない。条件式（６）の下限を超えると、後群ＬＲの正の屈折力が強くなりすぎ、球面収差、コマ収差、そして非点収差等をバランスよく補正することが困難になる。 Conditional expression (6) defines the ratio of the focal length of the rear lens group LR at the telephoto end to the focal length of the entire system at the wide-angle end, and mainly corrects various aberrations such as spherical aberration and coma while satisfactorily correcting the wide-angle end. This is for shortening the total lens length in. If the upper limit of conditional expression (6) is exceeded, the positive refractive power of the rear lens group LR becomes too weak, and the amount of movement of the lens groups included in the rear lens group LR required for zooming increases, which is not preferable. In addition, the total lens length at the wide-angle end tends to increase, which is not preferable. If the lower limit of conditional expression (6) is exceeded, the positive refractive power of the rear lens group LR becomes too strong, and it becomes difficult to correct spherical aberration, coma aberration, and astigmatism in a well-balanced manner.
条件式（７）は、レンズＰ１の像ぶれ補正に際しての像シフト敏感度を規定している。条件式（７）の上限を超えると、像を所定量シフトするために必要なレンズＰ１の移動量が大きくなり、全系の小型化が困難となる。また、像を所定量シフトするためにレンズＰ１をシフトした際の収差変動の軽減が困難となる。条件式（７）の下限を超えると、レンズ群Ｐ１の微小な移動に対し、像が大きくシフトし、高い精度で像変位の制御が要求されるので、好ましくない。 Conditional expression (7) defines the image shift sensitivity when the image blur of the lens P1 is corrected. If the upper limit of conditional expression (7) is exceeded, the amount of movement of the lens P1 required to shift the image by a predetermined amount becomes large, making it difficult to downsize the entire system. Further, it becomes difficult to reduce the aberration variation when the lens P1 is shifted to shift the image by a predetermined amount. When the value goes below the lower limit of the conditional expression (7), the image largely shifts with respect to a minute movement of the lens group P1, and the image displacement control is required with high accuracy, which is not preferable.
条件式（８）、（９）は、レンズＰ１を構成する材料を規定している。条件式（８）、（９）は主に広角端において軸上色収差の発生を軽減しつつ、偏芯時の色収差の発生を軽減するためのものである。レンズＰ１の材料の屈折率とアッベ数が条件式（８）、（９）の範囲内であれば、像ぶれ補正に際して像面湾曲と偏芯色収差を補正するのが容易となる。 The conditional expressions (8) and (9) define the material forming the lens P1. Conditional expressions (8) and (9) are mainly for reducing the occurrence of axial chromatic aberration at the wide-angle end, while reducing the occurrence of chromatic aberration during decentering. If the refractive index and the Abbe number of the material of the lens P1 are within the ranges of the conditional expressions (8) and (9), it becomes easy to correct the field curvature and the eccentric chromatic aberration during the image blur correction.
また、各実施例において後群ＬＲは少なくとも１つの非球面を有することが望ましい。広角端において像面湾曲を効果的に補正しつつ、全系の小型化を図るために、少なくとも１つの非球面を有することが望ましい。 Further, in each embodiment, it is desirable that the rear lens group LR has at least one aspherical surface. It is desirable to have at least one aspherical surface in order to reduce the size of the entire system while effectively correcting the field curvature at the wide-angle end.
以上のように本発明によれば、広角端においてレンズ全長が短く、簡素な構成で像ブレ補正が容易にでき、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を有するズームレンズが容易に得られる。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。
０．１＜βｓｔ／βｓｗ＜２．５ ・・・（２ａ）
２．４＜Ｄ２３ｗ／Ｄ２３ｔ＜１８．０ ・・・（３ａ）
１．３＜｜１−βＰｗ｜＜２２．０ ・・・（４ａ）
１．２５＜ｆＰ／ｆＲｔ＜４．００ ・・・（５ａ）
１．０＜ｆＲｔ／ｆｗ＜１．８ ・・・（６ａ）
０．６＜（１−βＰｔ）×βＲｔ＜１．７ ・・・（７ａ）
１．４７＜ｎＰ＜１．７０ ・・・（８ａ）
５０．０＜νＰ＜８５．０ ・・・（９ａ）
条件式（２ａ）を満たすことにより、第２レンズ群Ｌ２の変倍分担がより適正となり、広画角化を図った際の像面湾曲の補正が容易になる。条件式（３ａ）を満たすことにより、広角端および望遠端における第２レンズ群Ｌ２と第３レンズ群Ｌ３のレンズ間隔がより適正となり、前玉有効径の小型化がし易くなる。条件式（４ａ）を満たすことにより、レンズＰ１の像シフト敏感度を適正化しつつ、像ぶれ補正の際の画質劣化を抑制し易くなる。
As described above, according to the present invention, the total lens length is short at the wide-angle end, image blur correction can be easily performed with a simple configuration, and high optical characteristics in which various aberrations such as spherical aberration, coma aberration, and field curvature are favorably corrected. A zoom lens having performance can be easily obtained. More preferably, the numerical ranges of conditional expressions (2) to (9) should be set as follows.
0.1<βst/βsw<2.5 (2a)
2.4<D23w/D23t<18.0 (3a)
1.3<|1-βPw|<22.0 (4a)
1.25<fP/fRt<4.00 (5a)
1.0<fRt/fw<1.8 (6a)
0.6<(1-βPt)×βRt<1.7 (7a)
1.47<nP<1.70 (8a)
50.0<νP<85.0 (9a)
By satisfying the conditional expression (2a), the variable-magnification share of the second lens unit L2 becomes more appropriate, and it becomes easy to correct the field curvature when a wide angle of view is achieved. By satisfying conditional expression (3a), the lens spacing between the second lens unit L2 and the third lens unit L3 at the wide-angle end and the telephoto end becomes more appropriate, and the effective diameter of the front lens can be easily reduced. By satisfying the conditional expression (4a), it becomes easy to suppress the image quality deterioration at the time of image blur correction while optimizing the image shift sensitivity of the lens P1.
条件式（５ａ）を満たすことにより、広角端におけるレンズ全長の短縮を図りつつ、レンズＰ１のシフト敏感度を適正化し易くなる。条件式（６ａ）を満たすことにより、広角端でのバックフォーカスを十分長く確保しつつ、広角化を図ることが容易となる。また、ズーム全域に渡ってフォーカシングに伴う像面湾曲の変動を、より軽減することが容易となる。 By satisfying conditional expression (5a), it becomes easy to optimize the shift sensitivity of the lens P1 while shortening the total lens length at the wide-angle end. By satisfying conditional expression (6a), it becomes easy to widen the angle while ensuring a sufficiently long back focus at the wide-angle end. Further, it becomes easier to further reduce the fluctuation of the field curvature due to focusing over the entire zoom range.
条件式（７ａ）を満たすことにより、望遠端におけるレンズＰ１の像シフト敏感度が適正となり、レンズＰ１の小型軽量化が容易となる。条件式（８ａ）、（９ａ）を満たすことにより、像ぶれ補正の際の軸上色収差の変動と倍率色収差および像面湾曲の変動を、より軽減することが容易になる。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。
０．２＜βｓｔ／βｓｗ＜２．３ ・・・（２ｂ）
３．０＜Ｄ２３ｗ／Ｄ２３ｔ＜１７．０ ・・・（３ｂ）
１．５８＜｜１−βＰｗ｜＜２０．００ ・・・（４ｂ）
１．５＜ｆＰ／ｆＲｔ＜３．４ ・・・（５ｂ）
１．３＜ｆＲｔ／ｆｗ＜１．６ ・・・（６ｂ）
０．７＜（１−βＰｔ）×βＲｔ＜１．４ ・・・（７ｂ）
１．４８＜ｎＰ＜１．６５ ・・・（８ｂ）
５８．０＜νＰ＜７２．０ ・・・（９ｂ）
この他条件式（７）の数値範囲を次の如く設定するのが良い。
０．７＜（１−βＰｔ）×βＲｔ＜１．８ ・・・（７ｘ）
次に本発明のズームレンズを撮像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１６を用いて説明する。図１６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。
By satisfying the conditional expression (7a), the image shift sensitivity of the lens P1 at the telephoto end becomes appropriate, and the lens P1 can be easily reduced in size and weight. By satisfying the conditional expressions (8a) and (9a), it becomes easier to further reduce the fluctuations of the axial chromatic aberration, the lateral chromatic aberration, and the curvature of field during the image blur correction. More preferably, the numerical ranges of conditional expressions (2a) to (9a) should be set as follows.
0.2<βst/βsw<2.3 (2b)
3.0<D23w/D23t<17.0 (3b)
1.58<|1-βPw|<20.00 (4b)
1.5<fP/fRt<3.4 (5b)
1.3<fRt/fw<1.6 (6b)
0.7<(1-βPt)×βRt<1.4 (7b)
1.48<nP<1.65 (8b)
58.0<νP<72.0 (9b)
In addition to this, it is preferable to set the numerical range of conditional expression (7) as follows.
0.7<(1-βPt)×βRt<1.8 (7x)
Next, an embodiment of a digital still camera using the zoom lens of the present invention as an image pickup optical system will be described with reference to FIG. In FIG. 16, reference numeral 10 is a camera main body, and 11 is a photographing optical system including any of the zoom lenses described in the first to fifth embodiments. Reference numeral 12 denotes a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or a CMOS sensor which is built in the camera body and receives a subject image formed by the photographing optical system 11.
以下、実施例１乃至５に対応する具体的な数値データを示す。各数値データにおいて、ｉは物体側から数えた面番号を示す。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。非球面形状は光軸方向にＸ軸、光軸と垂直方向にＨ軸、光の進行方向を正とし、Ｒを近軸曲率半径、Ｋを円錐定数、Ａ４、Ａ６、Ａ８、Ａ１０、Ａ１２を各々非球面係数としたとき、 Specific numerical data corresponding to Examples 1 to 5 will be shown below. In each numerical data, i indicates the surface number counted from the object side. 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. The aspherical shape has an X axis in the optical axis direction, an H axis in the direction perpendicular to the optical axis, a positive light traveling direction, R is a paraxial curvature radius, K is a conic constant, and A4, A6, A8, A10, and A12 are When each is an aspherical coefficient,
なる式で表している。＊は非球面形状を有する面を意味している。「ｅ−ｘ」は１０−ｘを意味している。ＢＦはバックフォーカスであり、最終レンズ面から像面までの距離を示している。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の距離を加えた値である。広角は広角端、中間は中間のズーム位置、望遠は望遠端を示している。また前述の各条件式に関するパラメータ及び各条件式に対する各数値実施例との関係を表１に示す。 It is expressed by the formula. * Means a surface having an aspherical shape. "E-x" means 10 -x. BF is a back focus and indicates the distance from the final lens surface to the image surface. The total lens length is a value obtained by adding the back focus distance to the distance from the first lens surface to the final lens surface. The wide angle indicates the wide-angle end, the middle indicates the middle zoom position, and the telephoto indicates the telephoto end. Table 1 shows the relationship between the parameters relating to the conditional expressions described above and the numerical examples with respect to the conditional expressions.
［数値データ１］
単位 mm
面データ
面番号 r d nd νd
1 62.156 1.80 1.90366 31.3
2 36.268 7.54 1.71300 53.9
3 -4672.434 (可変)
4 59.690 1.20 1.83481 42.7
5 11.796 6.97
6* -30.926 1.10 1.55332 71.7
7 26.683 0.30
8 22.131 3.21 1.85478 24.8
9 130.703 (可変)
10 330.831 1.90 1.48749 70.2
11 -41.976 (可変)
12(絞り) ∞ 2.00
13* 12.178 5.65 1.55332 71.7
14 -32.945 0.55
15 -44.850 1.00 1.91082 35.3
16 27.804 3.05
17 -306.745 2.07 1.59551 39.2
18 -24.487 0.75 1.83481 42.7
19 102.330 (可変)
20 25.065 2.34 1.58313 59.4
21* -51.815 (可変)
像面 ∞
[Numerical data 1]
Unit mm
Surface data Surface number rd nd νd
1 62.156 1.80 1.90366 31.3
2 36.268 7.54 1.71300 53.9
3 -4672.434 (variable)
4 59.690 1.20 1.83481 42.7
5 11.796 6.97
6* -30.926 1.10 1.55332 71.7
7 26.683 0.30
8 22.131 3.21 1.85478 24.8
9 130.703 (variable)
10 330.831 1.90 1.48749 70.2
11 -41.976 (variable)
12 (aperture) ∞ 2.00
13* 12.178 5.65 1.55332 71.7
14 -32.945 0.55
15 -44.850 1.00 1.91082 35.3
16 27.804 3.05
17 -306.745 2.07 1.59551 39.2
18 -24.487 0.75 1.83481 42.7
19 102.330 (variable)
20 25.065 2.34 1.58313 59.4
21* -51.815 (variable)
Image plane ∞
非球面データ
第6面
K = 0.00000e+000 A 4= 4.75383e-006 A 6=-2.99582e-008 A 8=-3.56889e-010
第13面
K = 0.00000e+000 A 4=-1.72486e-005 A 6=-3.11927e-009 A 8=-1.97961e-009
第21面
K = 0.00000e+000 A 4= 9.34164e-005 A 6= 2.72542e-007 A 8= 1.85157e-009
各種データ
ズーム比 3.34
広角 中間 望遠
焦点距離 17.52 35.37 58.59
Fナンバー 3.30 4.63 5.50
半画角（度） 29.71 15.79 9.69
像高 10.00 10.00 10.00
レンズ全長 107.58 123.02 144.65
BF 35.15 52.16 63.16
d 3 1.00 13.15 29.09
d 9 22.16 8.55 3.81
d11 6.50 6.83 6.40
d19 1.35 0.91 0.78
d21 35.15 52.16 63.16
ズームレンズ群データ
群 始面 焦点距離
1 1 105.29
2 4 -15.61
3 10 76.54
4 12 276.55
5 20 29.30
Aspheric surface data Surface 6
K = 0.00000e+000 A 4= 4.75383e-006 A 6=-2.99582e-008 A 8=-3.56889e-010
Surface 13
K = 0.00000e+000 A 4=-1.72486e-005 A 6=-3.11927e-009 A 8=-1.97961e-009
Side 21
K = 0.00000e+000 A 4= 9.34164e-005 A 6= 2.72542e-007 A 8= 1.85157e-009
Various data Zoom ratio 3.34
Wide-angle mid-telephoto focal length 17.52 35.37 58.59
F number 3.30 4.63 5.50
Half angle of view (degrees) 29.71 15.79 9.69
Image height 10.00 10.00 10.00
Total lens length 107.58 123.02 144.65
BF 35.15 52.16 63.16
d 3 1.00 13.15 29.09
d 9 22.16 8.55 3.81
d11 6.50 6.83 6.40
d19 1.35 0.91 0.78
d21 35.15 52.16 63.16
Zoom lens group Data group Start surface Focal length
1 1 105.29
2 4 -15.61
3 10 76.54
4 12 276.55
5 20 29.30
［数値データ２］
単位 mm
面データ
面番号 r d nd νd
1 50.263 1.50 1.84666 23.8
2 38.708 5.77 1.65160 58.5
3 307.011 (可変)
4* 38.523 1.10 1.95375 32.3
5 10.858 6.82
6 -40.949 0.90 1.65844 50.9
7 27.291 1.00
8 22.625 2.65 1.89286 20.4
9 346.462 (可変)
10 -144.105 1.50 1.48749 70.2
11 -31.973 1.50
12(絞り) ∞ (可変)
13 -34.224 0.80 1.77250 49.6
14 -267.275 (可変)
15 11.193 4.16 1.49700 81.5
16 82.620 0.30
17 21.750 4.18 1.53775 74.7
18 -18.579 1.00 1.90366 31.3
19 -25.563 0.54
20* -95.955 1.00 1.83220 40.1
21* 30.818 (可変)
像面 ∞
[Numerical data 2]
Unit mm
Surface data Surface number rd nd νd
1 50.263 1.50 1.84666 23.8
2 38.708 5.77 1.65160 58.5
3 307.011 (variable)
4* 38.523 1.10 1.95375 32.3
5 10.858 6.82
6 -40.949 0.90 1.65844 50.9
7 27.291 1.00
8 22.625 2.65 1.89286 20.4
9 346.462 (variable)
10 -144.105 1.50 1.48749 70.2
11 -31.973 1.50
12 (Aperture) ∞ (Variable)
13 -34.224 0.80 1.77250 49.6
14 -267.275 (variable)
15 11.193 4.16 1.49700 81.5
16 82.620 0.30
17 21.750 4.18 1.53775 74.7
18 -18.579 1.00 1.90366 31.3
19 -25.563 0.54
20* -95.955 1.00 1.83220 40.1
21* 30.818 (variable)
Image plane ∞
非球面データ
第4面
K = 0.00000e+000 A 4= 3.40292e-006 A 6=-1.01860e-008 A 8= 9.24689e-012
第20面
K = 0.00000e+000 A 4=-2.08307e-004 A 6= 2.91060e-006 A 8=-1.29153e-007 A10=
3.29179e-009 A12=-3.47581e-011
第21面
K =-3.91679e+001 A 4= 1.29989e-004 A 6= 7.26953e-007 A 8=-4.36629e-008 A10=
2.14923e-009 A12=-2.27788e-011
各種データ
ズーム比 3.25
広角 中間 望遠
焦点距離 16.37 34.52 53.28
Fナンバー 3.84 4.98 5.84
半画角（度） 31.42 16.16 10.63
像高 10.00 10.00 10.00
レンズ全長 100.08 115.04 131.43
BF 35.60 50.02 59.56
d 3 1.00 15.73 27.04
d 9 20.26 6.37 2.30
d12 6.26 6.33 6.54
d14 2.22 1.85 1.27
d21 35.60 50.02 59.56
ズームレンズ群データ
群 始面 焦点距離
1 1 101.33
2 4 -16.20
3 10 83.92
4 13 -50.89
5 15 20.48
Aspherical data 4th surface
K = 0.00000e+000 A 4= 3.40292e-006 A 6=-1.01860e-008 A 8= 9.24689e-012
Surface 20
K = 0.00000e+000 A 4=-2.08307e-004 A 6= 2.91060e-006 A 8=-1.29153e-007 A10=
3.29179e-009 A12=-3.47581e-011
Side 21
K =-3.91679e+001 A 4= 1.29989e-004 A 6= 7.26953e-007 A 8=-4.36629e-008 A10=
2.14923e-009 A12=-2.27788e-011
Various data Zoom ratio 3.25
Wide-angle mid-telephoto focal length 16.37 34.52 53.28
F number 3.84 4.98 5.84
Half angle of view (degrees) 31.42 16.16 10.63
Image height 10.00 10.00 10.00
Total lens length 100.08 115.04 131.43
BF 35.60 50.02 59.56
d 3 1.00 15.73 27.04
d 9 20.26 6.37 2.30
d12 6.26 6.33 6.54
d14 2.22 1.85 1.27
d21 35.60 50.02 59.56
Zoom lens group Data group Start surface Focal length
1 1 101.33
2 4 -16.20
3 10 83.92
4 13 -50.89
5 15 20.48
［数値データ３］
単位 mm
面データ
面番号 r d nd νd
1 46.149 1.60 1.80518 25.4
2 35.132 6.92 1.60311 60.6
3 266.045 (可変)
4 38.823 1.00 1.91082 35.3
5 11.173 6.60
6 -54.453 0.85 1.69680 55.5
7 24.324 0.21
8 19.094 3.98 1.85478 24.8
9 532.538 (可変)
10(絞り) ∞ 2.75
11 387.889 1.51 1.48749 70.2
12 -32.737 (可変)
13 -23.815 0.68 1.77250 49.6
14 -547.091 (可変)
15 14.949 4.35 1.59522 67.7
16 -65.249 0.20
17 18.168 4.00 1.72000 50.2
18 -29.900 0.65 1.91082 35.3
19 17.833 1.22
20 54.000 1.70 1.53110 55.9
21* -153.320 (可変)
22 ∞ 35.50
像面 ∞
[Numerical data 3]
Unit mm
Surface data Surface number rd nd νd
1 46.149 1.60 1.80518 25.4
2 35.132 6.92 1.60311 60.6
3 266.045 (variable)
4 38.823 1.00 1.91082 35.3
5 11.173 6.60
6 -54.453 0.85 1.69680 55.5
7 24.324 0.21
8 19.094 3.98 1.85478 24.8
9 532.538 (variable)
10 (aperture) ∞ 2.75
11 387.889 1.51 1.48749 70.2
12 -32.737 (variable)
13 -23.815 0.68 1.77250 49.6
14 -547.091 (variable)
15 14.949 4.35 1.59522 67.7
16 -65.249 0.20
17 18.168 4.00 1.72000 50.2
18 -29.900 0.65 1.91082 35.3
19 17.833 1.22
20 54.000 1.70 1.53110 55.9
21* -153.320 (variable)
22 ∞ 35.50
Image plane ∞
非球面データ
第21面
K = 0.00000e+000 A 4= 1.61053e-004 A 6= 7.92230e-007 A 8= 1.89252e-008 A10=
-2.39009e-010 A12= 3.76860e-012
各種データ
ズーム比 2.88
広角 中間 望遠
焦点距離 18.57 34.92 53.41
Fナンバー 4.12 4.93 5.71
半画角（度） 36.34 21.36 14.35
像高 13.66 13.66 13.66
レンズ全長 104.14 116.44 129.94
BF 35.50 35.50 35.50
d 3 0.92 16.52 26.85
d 9 21.93 8.73 3.40
d12 4.07 4.14 4.63
d14 2.21 2.14 1.65
d21 1.29 11.18 19.69
ズームレンズ群データ
群 始面 焦点距離
1 1 103.44
2 4 -18.76
3 10 62.00
4 13 -32.25
5 15 19.03
6 22 ∞
Aspheric surface data surface 21
K = 0.00000e+000 A 4= 1.61053e-004 A 6= 7.92230e-007 A 8= 1.89252e-008 A10=
-2.39009e-010 A12= 3.76860e-012
Various data Zoom ratio 2.88
Wide-angle mid-telephoto focal length 18.57 34.92 53.41
F number 4.12 4.93 5.71
Half angle of view (degrees) 36.34 21.36 14.35
Image height 13.66 13.66 13.66
Total lens length 104.14 116.44 129.94
BF 35.50 35.50 35.50
d 3 0.92 16.52 26.85
d 9 21.93 8.73 3.40
d12 4.07 4.14 4.63
d14 2.21 2.14 1.65
d21 1.29 11.18 19.69
Zoom lens group Data group Start surface Focal length
1 1 103.44
2 4 -18.76
3 10 62.00
4 13 -32.25
5 15 19.03
6 22 ∞
［数値データ４］
単位 mm
面データ
面番号 r d nd νd
1 50.000 1.48 1.84666 23.8
2 41.418 4.76 1.71300 53.9
3 203.270 (可変)
4 36.287 1.00 1.95375 32.3
5 9.913 4.91
6* -42.835 1.10 1.76802 49.2
7 37.510 0.10
8 20.227 2.84 1.92286 20.9
9 -4006.687 (可変)
10 ∞ 1.83 1.59282 68.6
11 -23.120 1.50
12(絞り) ∞ 2.18
13 22.780 4.70 1.53775 74.7
14 -9.334 1.00 1.80518 25.4
15 -17.675 0.57
16 -9.500 2.90 1.83400 37.2
17* -9.226 (可変)
18* 14.158 1.00 1.85135 40.1
19* 7.730 (可変)
20 33.857 2.83 1.58144 40.8
21 -603.167 (可変)
像面 ∞
[Numerical data 4]
Unit mm
Surface data Surface number rd nd νd
1 50.000 1.48 1.84666 23.8
2 41.418 4.76 1.71300 53.9
3 203.270 (variable)
4 36.287 1.00 1.95375 32.3
5 9.913 4.91
6* -42.835 1.10 1.76802 49.2
7 37.510 0.10
8 20.227 2.84 1.92286 20.9
9 -4006.687 (variable)
10 ∞ 1.83 1.59282 68.6
11 -23.120 1.50
12 (aperture) ∞ 2.18
13 22.780 4.70 1.53775 74.7
14 -9.334 1.00 1.80518 25.4
15 -17.675 0.57
16 -9.500 2.90 1.83400 37.2
17* -9.226 (variable)
18* 14.158 1.00 1.85135 40.1
19* 7.730 (variable)
20 33.857 2.83 1.58144 40.8
21 -603.167 (variable)
Image plane ∞
非球面データ
第6面
K = 0.00000e+000 A 4=-1.21910e-005 A 6=-4.30589e-008 A 8= 3.99751e-010 A10=
-1.18058e-011
第17面
K = 0.00000e+000 A 4= 1.10442e-004 A 6=-7.36507e-007 A 8= 2.70190e-008 A10=
-1.59983e-010
第18面
K = 0.00000e+000 A 4=-9.45110e-004 A 6= 2.24365e-005 A 8=-3.76588e-007 A10=
3.00125e-009
第19面
K = 0.00000e+000 A 4=-1.31918e-003 A 6= 2.72203e-005 A 8=-5.61796e-007 A10=
4.26501e-009
各種データ
ズーム比 2.87
広角 中間 望遠
焦点距離 18.58 28.13 53.38
Fナンバー 3.64 4.15 5.29
半画角（度） 28.28 19.57 10.61
像高 10.00 10.00 10.00
レンズ全長 79.30 90.34 115.50
BF 18.85 25.06 41.51
d 3 1.10 11.98 27.44
d 9 13.62 7.35 0.82
d17 3.76 3.20 1.10
d19 7.27 8.05 9.93
d21 18.85 25.06 41.51
ズームレンズ群データ
群 始面 焦点距離
1 1 95.93
2 4 -17.62
3 10 16.23
4 18 -21.54
5 20 55.23
Aspheric surface data Surface 6
K = 0.00000e+000 A 4=-1.21910e-005 A 6=-4.30589e-008 A 8= 3.99751e-010 A10=
-1.18058e-011
Surface 17
K = 0.00000e+000 A 4= 1.10442e-004 A 6=-7.36507e-007 A 8= 2.70190e-008 A10=
-1.59983e-010
Surface 18
K = 0.00000e+000 A 4=-9.45110e-004 A 6= 2.24365e-005 A 8=-3.76588e-007 A10=
3.00125e-009
Surface 19
K = 0.00000e+000 A 4=-1.31918e-003 A 6= 2.72203e-005 A 8=-5.61796e-007 A10=
4.26501e-009
Various data Zoom ratio 2.87
Wide-angle mid-telephoto focal length 18.58 28.13 53.38
F number 3.64 4.15 5.29
Half angle of view 28.28 19.57 10.61
Image height 10.00 10.00 10.00
Total lens length 79.30 90.34 115.50
BF 18.85 25.06 41.51
d 3 1.10 11.98 27.44
d 9 13.62 7.35 0.82
d17 3.76 3.20 1.10
d19 7.27 8.05 9.93
d21 18.85 25.06 41.51
Zoom lens group Data group Start surface Focal length
1 1 95.93
2 4 -17.62
3 10 16.23
4 18 -21.54
5 20 55.23
［数値データ５］
単位 mm
面データ
面番号 r d nd νd
1 50.207 1.50 1.84666 23.8
2 33.336 7.58 1.72000 50.2
3 268.925 (可変)
4 42.581 1.10 1.90043 37.4
5 11.665 7.84
6 -53.113 0.90 1.59522 67.7
7 25.160 0.30
8 20.130 3.28 1.85478 24.8
9 106.753 (可変)
10(絞り) ∞ 2.20
11 725.432 1.38 1.64000 60.1
12 -44.098 (可変)
13 -41.409 0.80 1.80400 46.6
14 -485.697 (可変)
15 16.936 2.38 1.75500 52.3
16 50.548 0.20
17 18.924 0.80 1.89190 37.1
18 12.345 3.31 1.65160 58.5
19 87.608 1.25
20 123.604 0.75 1.85150 40.8
21 9.666 4.16 1.58313 59.4
22* -103.215 (可変)
像面 ∞
[Numerical data 5]
Unit mm
Surface data Surface number rd nd νd
1 50.207 1.50 1.84666 23.8
2 33.336 7.58 1.72000 50.2
3 268.925 (variable)
4 42.581 1.10 1.90043 37.4
5 11.665 7.84
6 -53.113 0.90 1.59522 67.7
7 25.160 0.30
8 20.130 3.28 1.85478 24.8
9 106.753 (variable)
10 (aperture) ∞ 2.20
11 725.432 1.38 1.64000 60.1
12 -44.098 (variable)
13 -41.409 0.80 1.80400 46.6
14 -485.697 (variable)
15 16.936 2.38 1.75500 52.3
16 50.548 0.20
17 18.924 0.80 1.89190 37.1
18 12.345 3.31 1.65160 58.5
19 87.608 1.25
20 123.604 0.75 1.85 150 40.8
21 9.666 4.16 1.58313 59.4
22* -103.215 (variable)
Image plane ∞
非球面データ
第22面
K =-7.20897e+002 A 4=-1.51321e-005 A 6= 2.42790e-006 A 8=-4.96675e-008 A10=
6.94423e-010 A12=-3.88085e-012
各種データ
ズーム比 3.17
広角 中間 望遠
焦点距離 18.54 35.23 58.79
Fナンバー 4.12 4.93 5.82
半画角（度） 28.34 15.85 9.65
像高 10.00 10.00 10.00
レンズ全長 108.36 120.09 135.57
BF 35.91 46.09 55.56
d 3 0.90 15.20 27.02
d 9 22.28 9.54 3.72
d12 4.71 5.81 7.56
d14 4.83 3.73 1.98
d22 35.91 46.09 55.56
ズームレンズ群データ
群 始面 焦点距離
1 1 94.07
2 4 -18.26
3 10 65.00
4 13 -56.35
5 15 24.96
Aspheric data 22nd surface
K =-7.20897e+002 A 4=-1.51321e-005 A 6= 2.42790e-006 A 8=-4.96675e-008 A10=
6.94423e-010 A12=-3.88085e-012
Various data Zoom ratio 3.17
Wide-angle mid-telephoto focal length 18.54 35.23 58.79
F number 4.12 4.93 5.82
Half angle of view (degree) 28.34 15.85 9.65
Image height 10.00 10.00 10.00
Total lens length 108.36 120.09 135.57
BF 35.91 46.09 55.56
d 3 0.90 15.20 27.02
d 9 22.28 9.54 3.72
d12 4.71 5.81 7.56
d14 4.83 3.73 1.98
d22 35.91 46.09 55.56
Zoom lens group Data group Start surface Focal length
1 1 94.07
2 4 -18.26
3 10 65.00
4 13 -56.35
5 15 24.96
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 ＬＲ 後群
L1 First lens group L2 Second lens group L3 Third lens group L4 Fourth lens group L5 Fifth lens group LR Rear group
Claims (13)
広角端から望遠端へのズーミングに際し、前記第１レンズ群と前記第２レンズ群の間隔は広がり、前記第２レンズ群と前記後群の間隔は狭まり、
前記後群は、前記後群の中で最も物体側に配置された、像ぶれ補正に際して光軸に対して垂直方向の成分を持つように移動する正の屈折力のレンズＰ１を有し、
前記レンズＰ１の物体側のレンズ面の曲率半径をＲ１Ｐ１、前記レンズＰ１の像側のレンズ面の曲率半径をＲ２Ｐ１とし、レンズＰ１のシェープファクタＳＦＰ１を、
ＳＦＰ１＝（Ｒ２Ｐ１＋Ｒ１Ｐ１）／（Ｒ２Ｐ１−Ｒ１Ｐ１）
とするとき、
−２．５＜ＳＦＰ１＜−０．５
なる条件式を満たすことを特徴とするズームレンズ。 A rear group having a positive refracting power as a whole, including a first lens group having a positive refracting power, a second lens group having a negative refracting power, and one or more lens groups, which are sequentially arranged from the object side to the image side. And a zoom lens in which the distance between adjacent lens groups changes during zooming,
Upon zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group widens, and the distance between the second lens group and the rear group narrows,
The rear group has a lens P1 having a positive refractive power, which is arranged on the most object side in the rear group and moves so as to have a component in a direction perpendicular to the optical axis during image blur correction,
The radius of curvature of the object side lens surface of the lens P1 is R1P1, the radius of curvature of the image side lens surface of the lens P1 is R2P1, and the shape factor SFP1 of the lens P1 is
SFP1=(R2P1+R1P1)/(R2P1-R1P1)
When
-2.5<SFP1<-0.5
A zoom lens characterized by satisfying the following conditional expression.
０．５＜（１−βＰｔ）×βＲｔ＜１．８
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 lateral magnification of the lens P1 at the telephoto end is βPt and the lateral magnification of the optical system arranged on the image side of the lens P1 at the telephoto end is βRt,
0.5<(1-βPt)×βRt<1.8
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際し、前記第１レンズ群と前記第２レンズ群の間隔は広がり、前記第２レンズ群と前記後群の間隔は狭まり、
前記後群は、像ぶれ補正に際して光軸に対して垂直方向の成分を持つように移動する正の屈折力のレンズＰ１を有し、
前記レンズＰ１の物体側のレンズ面の曲率半径をＲ１Ｐ１、前記レンズＰ１の像側のレンズ面の曲率半径をＲ２Ｐ１、レンズＰ１のシェープファクタＳＦＰ１を、
ＳＦＰ１＝（Ｒ２Ｐ１＋Ｒ１Ｐ１）／（Ｒ２Ｐ１−Ｒ１Ｐ１）
とし、望遠端における前記レンズＰ１の横倍率をβＰｔ、望遠端における前記レンズＰ１より像側に配置された光学系の横倍率をβＲｔとするとき、
−２．５＜ＳＦＰ１＜−０．５
０．８４５≦（１−βＰｔ）×βＲｔ＜１．８
なる条件式を満たすことを特徴とするズームレンズ。 A rear group having a positive refracting power as a whole, including a first lens group having a positive refracting power, a second lens group having a negative refracting power, and one or more lens groups, which are sequentially arranged from the object side to the image side. And a zoom lens in which the distance between adjacent lens groups changes during zooming,
Upon zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group widens, and the distance between the second lens group and the rear group narrows,
The rear group includes a lens P1 having a positive refractive power that moves so as to have a component in a direction perpendicular to the optical axis when correcting an image blur,
The radius of curvature of the object side lens surface of the lens P1 is R1P1, the radius of curvature of the image side lens surface of the lens P1 is R2P1, and the shape factor SFP1 of the lens P1 is
SFP1=(R2P1+R1P1)/(R2P1-R1P1)
When the lateral magnification of the lens P1 at the telephoto end is βPt and the lateral magnification of the optical system arranged on the image side of the lens P1 at the telephoto end is βRt,
-2.5<SFP1<-0.5
0.845≦(1-βPt)×βRt<1.8
A zoom lens characterized by satisfying the following conditional expression.
０．０１＜βｓｔ／βｓｗ＜３．２０
なる条件式を満たすことを特徴とする請求項１乃至３のいずれか一項に記載のズームレンズ。 When the lateral magnification of the composite system from the second lens group to the lens P1 at the wide-angle end is βsw, and the lateral magnification of the composite system from the second lens group to the lens P1 at the telephoto end is βst,
0.01<βst/βsw<3.20
The zoom lens according to any one of claims 1 to 3, wherein the following conditional expression is satisfied.
広角端における前記第２レンズ群と前記第３レンズ群の光軸上の間隔をＤ２３ｗ、望遠端における前記第２レンズ群と前記第３レンズ群の光軸上の間隔をＤ２３ｔとするとき、
１．８＜Ｄ２３ｗ／Ｄ２３ｔ＜２０．０
なる条件式を満たすことを特徴とする請求項１乃至４のいずれか一項に記載のズームレンズ。 The rear group includes a third lens group having a positive refractive power, which is arranged closest to the object side among the one or more lens groups,
When the distance on the optical axis between the second lens group and the third lens group at the wide-angle end is D23w and the distance on the optical axis between the second lens group and the third lens group at the telephoto end is D23t,
1.8<D23w/D23t<20.0
The zoom lens according to any one of claims 1 to 4, wherein the following conditional expression is satisfied.
１．０＜｜１−βＰｗ｜＜２５．０
なる条件式を満たす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。 When the lateral magnification of the lens P1 at the wide angle end is βPw,
1.0<|1-βPw|<25.0
The zoom lens according to any one of claims 1 to 5, wherein the following conditional expression is satisfied.
１．１＜ｆＰ／ｆＲｔ＜４．８
なる条件式を満たすことを特徴とする請求項１乃至６のいずれか１項に記載のズームレンズ。 When the focal length of the lens P1 is fP and the focal length of the rear group at the telephoto end is fRt,
1.1<fP/fRt<4.8
7. The zoom lens according to claim 1, wherein the zoom lens satisfies the following conditional expression.
０．７＜ｆＲｔ／ｆｗ＜２．０
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 rear group at the telephoto end is fRt and the focal length of the entire system at the wide-angle end is fw,
0.7<fRt/fw<2.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
１．４５＜ｎＰ＜１．７５
４５．０＜νＰ＜１００．０
なる条件式を満たすことを特徴とする請求項１乃至８のいずれか１項に記載のズームレンズ。 When the refractive index and Abbe number at the d-line of the material of the lens P1 are nP and νP, respectively,
1.45<nP<1.75
45.0<νP<100.0
9. The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
前記第３レンズ群は前記レンズＰ１から構成されることを特徴とする請求項１乃至９のいずれか１項に記載のズームレンズ。 The rear group includes a third lens group, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power, which are sequentially arranged from the object side to the image side.
The zoom lens according to claim 1, wherein the third lens group includes the lens P1.
前記第３レンズ群は前記レンズＰ１から構成されることを特徴とする請求項１乃至９のいずれか１項に記載のズームレンズ。 The rear group includes a third lens group, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, which are sequentially arranged from the object side to the image side.
The zoom lens according to claim 1, wherein the third lens group includes the lens P1.
前記第３レンズ群は複数のレンズから構成され、前記レンズＰ１は前記複数のレンズのうち最も物体側に配置されているレンズであることを特徴とする請求項１乃至９のいずれか１項に記載のズームレンズ。 The rear group includes a third lens group, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, which are sequentially arranged from the object side to the image side.
10. The third lens group is composed of a plurality of lenses, and the lens P1 is the lens arranged closest to the object side among the plurality of lenses, according to any one of claims 1 to 9. The described zoom lens.
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