JP2019174510A - Zoom lens and image capturing device - Google Patents

Zoom lens and image capturing device Download PDF

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JP2019174510A
JP2019174510A JP2018059447A JP2018059447A JP2019174510A JP 2019174510 A JP2019174510 A JP 2019174510A JP 2018059447 A JP2018059447 A JP 2018059447A JP 2018059447 A JP2018059447 A JP 2018059447A JP 2019174510 A JP2019174510 A JP 2019174510A
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JP7140522B2 (en
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豊克 藤崎
Toyokatsu Fujisaki
豊克 藤崎
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Canon Inc
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Abstract

To provide a zoom lens which comprises a compact lens system, has a wide view angle, and easily provides superior optical performance over an entire zoom range.SOLUTION: A zoom lens comprises first lens group L1 having negative refractive power, a second lens group L2 having positive refractive power, and a rear group LR having one or more lens groups, which are arranged in order from the object side to the image side, and is configured such that distances between adjacent lens groups change while zooming. The first lens group comprises a meniscus-shaped negative lens G1 and a meniscus-shaped negative lens G2 which are arranged in order from the object side to the image side. A curvature radius G1R2 of an image-side surface of the negative lens G1, a curvature radius G2R2 of an image-side surface of the negative lens G2, a thickness D1 of the first lens group, a back focus bfw at the wide-angle end, and a focal length fw of the entire system at the wide-angle end satisfy the following conditional expressions: 1.5<G1R2/G2R2<4.0, 4.0<D1/fw<10.0, 0.50<bfw/fw<1.95.SELECTED DRAWING: Figure 1

Description

本発明はズームレンズ及び撮像装置に関する。   The present invention relates to a zoom lens and an imaging apparatus.

近年、撮像素子を用いた撮像装置に用いられる撮像光学系には広画角で小型のズームレンズが要望されている。更に沈胴時のカメラ厚みが薄くなる様に各レンズ群のレンズ枚数が少なく、レンズ厚が薄いこと等が要求されている。   In recent years, there has been a demand for a small zoom lens with a wide angle of view for an imaging optical system used in an imaging apparatus using an imaging element. Furthermore, the number of lenses in each lens group is small and the lens thickness is required to be thin so that the camera thickness when retracted is thin.

全系が小型で広画角のズームレンズとして、負の屈折力のレンズ群が先行する（最も物体側に位置する）ネガティブリード型のズームレンズが知られている（特許文献１、２）。   As a zoom lens having a small size and a wide angle of view, a negative lead type zoom lens preceded by a lens unit having a negative refractive power (positioned closest to the object side) is known (Patent Documents 1 and 2).

特許文献１では、物体側より像側へ順に、負、正、正の屈折力の第１レンズ群乃至第３レンズ群よりなり、隣り合うレンズ群の間隔を変化させてズーミングを行うズームレンズを開示している。特許文献２では物体側から像側へ順に、負、正、負、正の屈折力の第１レンズ群乃至第４レンズ群からなり、隣り合うレンズ群の間隔を変化させてズーミングを行うズームレンズを開示している。   In Patent Document 1, a zoom lens that includes first to third lens groups having negative, positive, and positive refractive powers in order from the object side to the image side, and performs zooming by changing the interval between adjacent lens groups. Disclosure. In Patent Document 2, a zoom lens that includes first to fourth lens groups having 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. Is disclosed.

一方、近年のデジタルスチルカメラやビデオカメラといった撮像装置においては、諸収差のうち歪曲収差や色収差を電気的な画像処理で補正する事も行われている。この様な補正処理を活用する事でレンズ枚数の削減した小型のズームレンズが提案されている。   On the other hand, in recent imaging apparatuses such as digital still cameras and video cameras, distortion and chromatic aberration among various aberrations are corrected by electrical image processing. A small zoom lens in which the number of lenses is reduced by using such correction processing has been proposed.

特開２０１６−２０６２５７号公報JP, 2006-206257, A 特開２０１６−１２６２８２号公報Japanese Patent Laid-Open No. 2006-126282

ネガティブリード型のズームレンズは広画角化及び全系の小型化が有利であるが、レンズ系全体が非対称となるため、ズーミングに伴う諸収差の変動が大きく全ズーム範囲にわたり高い光学性能を得るのが難しい。ネガティブリード型のズームレンズにおいて、全系の小型化を図りつつ広画角で全ズーム範囲で画面全体にわたり高い光学性能を得るには、各レンズ群の屈折力や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。   A negative lead type zoom lens is advantageous in widening the angle of view and downsizing the entire system, but since the entire lens system is asymmetrical, variations in various aberrations due to zooming are large, and high optical performance is obtained over the entire zoom range. It is difficult. In a negative lead type zoom lens, to achieve high optical performance over the entire screen with a wide angle of view and full zoom range while reducing the size of the entire system, the refractive power and lens configuration of each lens group are set appropriately. It becomes important.

一般にネガティブリード型のズームレンズにおいて広画角化を図るには第１レンズ群の負の屈折力を強めれば良い。しかしながら第１レンズ群の負の屈折力を強めると広画角化に伴って諸収差、特に歪曲収差が増大してくる。このため、全系の小型化及び広画角化を図るには第１レンズ群の負の屈折力及び第１レンズ群に含まれる負レンズのレンズ枚数やレンズ形状等を適切に設定することが重要になってくる。   In general, in order to increase the angle of view in a negative lead type zoom lens, it is sufficient to increase the negative refractive power of the first lens unit. However, when the negative refracting power of the first lens group is increased, various aberrations, particularly distortion aberration, increase with an increase in the angle of view. Therefore, in order to reduce the size and wide angle of the entire system, it is necessary to appropriately set the negative refractive power of the first lens unit, the number of lenses of the negative lens included in the first lens unit, and the lens shape. It becomes important.

本発明は、レンズ系全体が小型で、広画角で全ズーム範囲で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。   SUMMARY OF THE INVENTION An object of the present invention is to provide a zoom lens that has a small lens system as a whole, can easily obtain high optical performance over a wide angle of view, and an entire zoom range, and an image pickup apparatus having the zoom lens.

本発明のズームレンズは、物体側より像側へ順に配置された、負の屈折力の第１レンズ群、正の屈折率の第２レンズ群、１つ以上のレンズ群を有する後群より構成され、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において、
前記第１レンズ群は物体側から像側へ順に配置されたメニスカス形状の負レンズＧ１、メニスカス形状の負レンズＧ２を有し、前記負レンズＧ１の像側のレンズ面の曲率半径をＧ１Ｒ２、前記負レンズＧ２の像側のレンズ面の曲率半径をＧ２Ｒ２、前記第１レンズ群の厚みＤ１、広角端におけるバックフォーカスをｂｆｗ、広角端における全系の焦点距離をｆｗとするとき、
１．５＜Ｇ１Ｒ２／Ｇ２Ｒ２＜４．０
４．０＜Ｄ１／ｆｗ＜１０．０
０．５０＜ｂｆｗ／ｆｗ＜１．９５
なる条件式を満足することを特徴としている。 The zoom lens according to the present invention includes a first lens group having a negative refractive power, a second lens group having a positive refractive index, and a rear group having one or more lens groups, which are arranged in order from the object side to the image side. In zoom lenses in which the distance between adjacent lens groups changes during zooming,
The first lens group includes a meniscus negative lens G1 and a meniscus negative lens G2 arranged in order from the object side to the image side, and the curvature radius of the lens surface on the image side of the negative lens G1 is G1R2. When the radius of curvature of the image side lens surface of the negative lens G2 is G2R2, the thickness D1 of the first lens group, the back focus at the wide angle end is bfw, and the focal length of the entire system at the wide angle end is fw,
1.5 <G1R2 / G2R2 <4.0
4.0 <D1 / fw <10.0
0.50 <bfw / fw <1.95
It satisfies the following conditional expression.

本発明によれば、レンズ系全体が小型で、広画角で全ズーム範囲で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 lens system is small, and high optical performance can be easily obtained in a wide angle of view and in the entire zoom range.

実施例１のズームレンズの広角端におけるレンズ断面図Lens cross-sectional view at the wide-angle end of the zoom lens of Example 1 実施例１のズームレンズの広角端、中間のズーム位置、望遠端における収差図Aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens of Example 1 実施例２のズームレンズの広角端におけるレンズ断面図Lens sectional view at the wide-angle end of the zoom lens according to Embodiment 2 実施例２のズームレンズの広角端、中間のズーム位置、望遠端における収差図Aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens of Example 2 実施例３のズームレンズの広角端におけるレンズ断面図Lens sectional view at the wide-angle end of the zoom lens according to Embodiment 3 実施例３のズームレンズの広角端、中間のズーム位置、望遠端における収差図Aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens of Example 3 実施例４のズームレンズの広角端におけるレンズ断面図Lens sectional view at the wide-angle end of the zoom lens according to Embodiment 4 実施例４のズームレンズの広角端、中間のズーム位置、望遠端における収差図Aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens of Example 4 実施例５のズームレンズの広角端におけるレンズ断面図Lens sectional view at the wide-angle end of the zoom lens according to Embodiment 5 実施例５のズームレンズの広角端、中間のズーム位置、望遠端における収差図Aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end of the zoom lens of Example 5 ズームレンズを搭載する撮像装置（デジタルカメラ）の要部概略図Schematic diagram of the main parts of an imaging device (digital camera) equipped with a zoom lens

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、負の屈折力の第１レンズ群、正の屈折率の第２レンズ群、１つ以上のレンズ群を有する後群より構成され、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。   Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The zoom lens according to the present invention includes a first lens group having a negative refractive power, a second lens group having a positive refractive index, and a rear group having one or more lens groups, which are arranged in order from the object side to the image side. The distance between adjacent lens groups changes during zooming.

図１は実施例１のズームレンズの広角端（短焦点距離端）におけるレンズ断面図である。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、中間焦点距離、望遠端（長焦点距離端）における収差図である。実施例１はズーム比２．２６、開口比（Ｆナンバー）４．１２、広角端における撮影半画角６４．６度程度のズームレンズである。   FIG. 1 is a lens cross-sectional view at the wide-angle end (short focal length end) of the zoom lens according to the first exemplary embodiment. 2A, 2B, and 2C are aberration diagrams at the wide-angle end, the intermediate focal length, and the telephoto end (long focal length end), respectively, of the zoom lens according to the first exemplary embodiment. Example 1 is a zoom lens having a zoom ratio of 2.26, an aperture ratio (F number) of 4.12, and a shooting half angle of view of about 64.6 degrees at the wide angle end.

図３は実施例２のズームレンズの広角端におけるレンズ断面図である。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、中間焦点距離、望遠端における収差図である。実施例２はズーム比２．３６、開口比４．１２、広角端における撮影半画角６０．５度程度のズームレンズである。   FIG. 3 is a lens cross-sectional view at the wide-angle end of the zoom lens according to the second exemplary embodiment. 4A, 4B, and 4C are aberration diagrams of the zoom lens of Example 2 at the wide-angle end, the intermediate focal length, and the telephoto end, respectively. The second embodiment is a zoom lens having a zoom ratio of 2.36, an aperture ratio of 4.12, and a shooting half angle of view of about 60.5 degrees at the wide angle end.

図５は実施例３のズームレンズの広角端におけるレンズ断面図である。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、中間焦点距離、望遠端における収差図である。実施例３はズーム比２．２４、開口比４．１２、広角端における撮影半画角６４．６度程度のズームレンズである。   FIG. 5 is a lens cross-sectional view at the wide-angle end of the zoom lens according to the third exemplary embodiment. 6A, 6B, and 6C are aberration diagrams at the wide-angle end, the intermediate focal length, and the telephoto end of the zoom lens according to Embodiment 3, respectively. Example 3 is a zoom lens having a zoom ratio of 2.24, an aperture ratio of 4.12, and a shooting half angle of view of about 64.6 degrees at the wide angle end.

図７は実施例４のズームレンズの広角端におけるレンズ断面図である。図８（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例４のズームレンズの広角端、中間焦点距離、望遠端における収差図である。実施例４はズーム比２．２６、開口比４．１２、広角端における撮影半画角６４．６度程度のズームレンズである。   FIG. 7 is a lens cross-sectional view at the wide-angle end of the zoom lens according to the fourth exemplary embodiment. 8A, 8B, and 8C are aberration diagrams at the wide-angle end, the intermediate focal length, and the telephoto end of the zoom lens according to Embodiment 4, respectively. Example 4 is a zoom lens having a zoom ratio of 2.26, an aperture ratio of 4.12, and a shooting half angle of view of about 64.6 degrees at the wide angle end.

図９は実施例５のズームレンズの広角端におけるレンズ断面図である。図１０（Ａ）、（Ｂ）、（Ｃ）はそれぞれ実施例５のズームレンズの広角端、中間焦点距離、望遠端における収差図である。実施例５はズーム比２．２６、開口比４．１２、広角端における撮影半画角６４．６度程度のズームレンズである。図１１は本発明の撮像装置の要部概略図である。   FIG. 9 is a lens cross-sectional view at the wide-angle end of the zoom lens according to the fifth exemplary embodiment. FIGS. 10A, 10B, and 10C are aberration diagrams at the wide-angle end, the intermediate focal length, and the telephoto end of the zoom lens according to Embodiment 5, respectively. Example 5 is a zoom lens having a zoom ratio of 2.26, an aperture ratio of 4.12, and a shooting half angle of view of about 64.6 degrees at the wide-angle end. FIG. 11 is a schematic diagram of a main part of the imaging apparatus of the present invention.

各実施例のズームレンズはビデオカメラやデジタルカメラ等の撮像装置に用いられる撮像光学系である。レンズ断面図において、左方が被写体側（物体側）（前方）で、右方が像側（後方）である。レンズ断面図において、ｉは物体側からのレンズ群の順番を示し、Ｌｉは第ｉレンズ群である。ＬＲは１つ以上のレンズ群を有する後群である。ＳＰはＦナンバー光束を制限する開口絞りである。ＦＰ１、ＦＰ２は各々有害光をカットするフレアーカット絞り（補助絞り）である。   The zoom lens of each embodiment is an imaging optical system used in an imaging apparatus such as a video camera or a digital camera. In the lens cross-sectional view, the left side is the subject side (object side) (front), and the right side is the image side (rear). In the lens cross-sectional view, i indicates the order of the lens groups from the object side, and Li is the i-th lens group. LR is a rear group having one or more lens groups. SP is an aperture stop that limits the F-number light beam. FP1 and FP2 are flare cut stops (auxiliary stops) for cutting harmful light.

Ｇは光学フィルター、フェースプレート、水晶ローパスフィルター、赤外カットフィルター等に相当する光学ブロックである。ＩＰは像面であり、ビデオカメラやデジタル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。レンズ断面図において、矢印は広角端から望遠端へのズーミングに際しての各レンズ群の移動軌跡を示している。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す。   G is an optical block corresponding to an optical filter, a face plate, a quartz low-pass filter, an infrared cut filter, or the like. IP is an image plane, and when used as a photographing optical system of a video camera or a digital still camera, an imaging plane of a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor is placed. In the lens cross-sectional view, arrows indicate the movement trajectory of each lens unit during zooming from the wide-angle end to the telephoto end. The focus arrow indicates the moving direction of the lens unit during focusing from infinity to a short distance.

収差図のうち、球面収差図においては実線のｄはｄ線（波長５８７．６ｎｍ）と二点鎖線のｇはｇ線（波長４３５．８ｎｍ）について示している。非点収差図において、点線のＭはｄ線のメリディオナル像面、実線のＳはｄ線のサジタル像面である。倍率色収差はｇ線によって表している。ωは半画角（度）、ＦｎｏはＦナンバーである。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。   Among the aberration diagrams, in the spherical aberration diagram, the solid line d indicates the d line (wavelength 587.6 nm) and the two-dot chain line g indicates the g line (wavelength 435.8 nm). In the astigmatism diagram, the dotted line M is the meridional image plane of the d line, and the solid line S is the sagittal image plane of the d line. Lateral chromatic aberration is represented by the g-line. ω is a half angle of view (degree), and Fno is an F number. In the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the zoom lens unit is positioned at both ends of a range in which the mechanism can move on the optical axis.

実施例１乃至３、５において後群ＬＲは、正の屈折力の第３レンズ群Ｌ３より構成されている。実施例１乃至３、５では広角端から望遠端へのズーミングに際して矢印に示すように第１レンズ群Ｌ１は像側へ凸状の軌跡を描いて移動している。これにより広角端におけるレンズ全長を短くし、前玉有効径の小型化を図りつつ、高いズーム比が得られるようにしている。また第２レンズ群Ｌ２は物体側に移動している。   In Examples 1 to 3, and 5, the rear group LR includes a third lens unit L3 having a positive refractive power. In Examples 1 to 3, and 5, when zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves along a locus convex toward the image side as indicated by an arrow. As a result, the total lens length at the wide-angle end is shortened, the front lens effective diameter is reduced, and a high zoom ratio is obtained. The second lens unit L2 moves to the object side.

ズーミングに際して第２レンズ群Ｌ２を物体側に移動させることにより、第２レンズ群Ｌ２に変倍分担を持たせている。第３レンズ群Ｌ３は像面側へ移動している。また、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うリアフォーカス方式を採用している。   By moving the second lens unit L2 to the object side during zooming, the second lens unit L2 has a variable magnification share. The third lens unit L3 moves to the image plane side. Further, a rear focus method is employed in which the third lens unit L3 is moved on the optical axis to perform focusing.

第３レンズ群Ｌ３に関する実線の曲線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へのズーミングに伴う際の像面変動を補正するための移動軌跡を示している。望遠端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３ｃに示すように第３レンズ群Ｌ３を前方に繰り出すことによって行っている。   The solid curve 3a and the dotted curve 3b relating to the third lens unit L3 are movements for correcting image plane fluctuations during zooming from the wide-angle end to the telephoto end when focusing at infinity and short distance, respectively. The trajectory is shown. When focusing from infinity to a short distance at the telephoto end, the third lens unit L3 is moved forward as indicated by an arrow 3c.

実施例４において後群ＬＲは、負の屈折力の第３レンズ群Ｌ３と正の屈折力の第４レンズ群Ｌ４より構成されている。実施例４では広角端から望遠端へのズーミングに際して矢印に示すように第１レンズ群Ｌ１は像側へ凸状の軌跡を描いて移動している。これにより広角端におけるレンズ全長を短くし、前玉有効径の小型化を図りつつ、高いズーム比が得られるようにしている。また第２レンズ群Ｌ２は物体側に移動している。   In Example 4, the rear group LR includes a third lens unit L3 having a negative refractive power and a fourth lens unit L4 having a positive refractive power. In Example 4, when zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves along a locus convex toward the image side as indicated by an arrow. As a result, the total lens length at the wide-angle end is shortened, the front lens effective diameter is reduced, and a high zoom ratio is obtained. The second lens unit L2 moves to the object side.

ズーミングに際して第２レンズ群Ｌ２を物体側に移動させることにより、第２レンズ群Ｌ２に変倍分担を持たせている。第３レンズ群Ｌ３は物体側へ移動し、第４レンズ群Ｌ４は像側へ移動している。第４レンズ群Ｌ４を光軸上移動させてフォーカシングを行うリアフォーカス方式を採用している。第４レンズ群Ｌ４に関する実線の曲線４ａと点線の曲線４ｂは各々無限遠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へのズーミングに伴う際の像面変動を補正するための移動軌跡を示している。   By moving the second lens unit L2 to the object side during zooming, the second lens unit L2 has a variable magnification share. The third lens unit L3 moves to the object side, and the fourth lens unit L4 moves to the image side. A rear focus method is employed in which focusing is performed by moving the fourth lens unit L4 on the optical axis. A solid curve 4a and a dotted curve 4b relating to the fourth lens unit L4 are movements for correcting image plane fluctuations during zooming from the wide-angle end to the telephoto end when focusing at infinity and short distance, respectively. The trajectory is shown.

望遠端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を前方に繰り出すことによって行っている。尚、実施例４では第３レンズ群Ｌ３を後方に繰り込むことによってフォーカスを行うようにしても良い。補助絞りＦＰ１はズーミングに際して他のレンズ群と異なった軌跡で移動する。開口絞りＳＰは補助絞りＦＰ２はズーミングに際して第２レンズ群Ｌ２と一体的に（同じ軌跡で）移動する。   When focusing from infinity to a short distance at the telephoto end, the fourth lens unit L4 is moved forward as indicated by an arrow 4c. In Example 4, focusing may be performed by retracting the third lens unit L3 backward. The auxiliary diaphragm FP1 moves along a locus different from that of other lens groups during zooming. The aperture stop SP moves integrally (with the same locus) with the second lens unit L2 during the zooming of the auxiliary stop FP2.

各実施例のズームレンズは、レンズ全長が短く、全系が小型でありながら、撮像画角１００度を超える超広画角で歪曲収差の少ない良好な光学性能を有している。超広画角を達成するためには、広角端において入射光束を発散させることが出来る第1レンズ群が負の屈折力よりなるネガティブリードタイプが有利である。   The zoom lens of each embodiment has a good optical performance with little distortion and an ultra-wide angle of view exceeding 100 degrees of the field of view, while the entire lens length is short and the entire system is small. In order to achieve an extremely wide angle of view, a negative lead type in which the first lens group capable of diverging an incident light beam at the wide-angle end and having a negative refractive power is advantageous.

しかしながら、所定のズーム比を得ようとすると、各レンズ群の移動量が大きくなりやすく、レンズ全体が大型化してくる。その為、広画角化、高ズーム比を図りつつ、全系の小型化を達成するために各実施例のズームレンズでは正の屈折力のレンズ群を像側へ配置する構成とし、各レンズ群に変倍分担を持たせている。また一般的に広画角化を図ると、第１レンズ群の負の屈折力が強まるため、特に広角側において歪曲収差、コマ収差、像面湾曲が増加してくる。   However, when trying to obtain a predetermined zoom ratio, the amount of movement of each lens group tends to increase, and the entire lens becomes larger. Therefore, in order to achieve a reduction in the entire system while achieving a wide angle of view and a high zoom ratio, the zoom lens of each embodiment has a configuration in which a lens group having a positive refractive power is arranged on the image side. The group has a variable share. In general, when the angle of view is increased, the negative refractive power of the first lens unit is increased, so that distortion, coma aberration, and field curvature increase particularly on the wide angle side.

そこで各実施例では、第１レンズ群に物体側から像側へ順にメニスカス形状の負レンズを少なくとも２枚配置し、これによって歪曲収差やコマ収差の発生を低減している。また、２枚のメニスカス形状の負レンズの像側のレンズ面の曲率半径を適切にすることで、撮像画角１００度を超える広画角でありながら、広角側において像面湾曲、歪曲収差を良好に補正している。   Therefore, in each embodiment, at least two meniscus negative lenses are arranged in the first lens group in order from the object side to the image side, thereby reducing the occurrence of distortion and coma. In addition, by adjusting the radius of curvature of the lens surface on the image side of the two meniscus negative lenses, it is possible to reduce curvature of field and distortion on the wide angle side while having a wide field angle exceeding 100 degrees. Corrected well.

また、第１レンズ群Ｌ１内のレンズ構成を適切に設定することにより、全系が小型でありながら超広角化を達成している。さらに、ズームレンズを広画角化するとそれに応じてバックフォーカスが短くなりやすく、センサー（撮像素子）へ入射する光線の入射角度がきつくなりテレセントリック性が低下してくる。その影響で広角側において像面湾曲が増加する。   In addition, by appropriately setting the lens configuration in the first lens unit L1, the super wide angle is achieved while the entire system is small. Further, when the zoom lens has a wide angle of view, the back focus tends to be shortened accordingly, and the incident angle of the light incident on the sensor (imaging device) becomes tight and the telecentricity decreases. As a result, curvature of field increases on the wide angle side.

そこで広角端におけるバックフォーカスの長さと焦点距離を適切に設定し、レンズ全長の短縮を図りつつ、所定の長さのバックフォーカスを確保することで、テレセントリック性を良くし、高い光学性能を得ている。   Therefore, by appropriately setting the back focus length and focal length at the wide-angle end and shortening the total lens length, ensuring a predetermined length of back focus, the telecentricity is improved and high optical performance is obtained. Yes.

各実施例において、第１レンズ群Ｌ１は物体側から像側へ順に配置されたメニスカス形状の負レンズＧ１、メニスカス形状の負レンズＧ２を有している。負レンズＧ１の像側のレンズ面の曲率半径をＧ１Ｒ２、負レンズＧ２の像側のレンズ面の曲率半径をＧ２Ｒ２、第１レンズ群の厚みＤ１、広角端におけるバックフォーカスをｂｆｗ、広角端における全系の焦点距離をｆｗとする。このとき、
１．５＜Ｇ１Ｒ２／Ｇ２Ｒ２＜４．０ ・・・（１）
４．０＜Ｄ１／ｆｗ＜１０．０ ・・・（２）
０．５０＜ｂｆｗ／ｆｗ＜１．９５ ・・・（３）
なる条件式を満足する。 In each embodiment, the first lens unit L1 includes a meniscus negative lens G1 and a meniscus negative lens G2 arranged in order from the object side to the image side. The radius of curvature of the image-side lens surface of the negative lens G1 is G1R2, the radius of curvature of the image-side lens surface of the negative lens G2 is G2R2, the thickness D1 of the first lens group, the back focus at the wide-angle end is bfw, and the total at the wide-angle end is bfw. Let fw be the focal length of the system. At this time,
1.5 <G1R2 / G2R2 <4.0 (1)
4.0 <D1 / fw <10.0 (2)
0.50 <bfw / fw <1.95 (3)
The following conditional expression is satisfied.

尚、本件で言うレンズ面の曲率半径とは、球面の場合はその近軸曲率半径、非球面の場合は広角端における物体距離無限時の軸上の光線が通る有効範囲で算出した参照球面半径と定義する。   The radius of curvature of the lens surface referred to in this case is the paraxial radius of curvature in the case of a spherical surface, and in the case of an aspherical surface, the reference spherical radius calculated within the effective range through which the light rays on the axis at the infinite object distance pass. It is defined as

各実施例では第１レンズ群Ｌ１のレンズ構成、レンズ面の曲率半径、レンズ群厚み及びバックフォーカス等を適切に定めることで、撮像画角１００度を超える超広角化と全系の小型化を図りつつ諸収差、特に歪曲収差の少ない高画質なズームレンズを得ている。   In each embodiment, by appropriately determining the lens configuration of the first lens unit L1, the radius of curvature of the lens surface, the lens unit thickness, the back focus, and the like, the super wide angle exceeding 100 degrees of field of view and the miniaturization of the entire system can be achieved. A high-quality zoom lens with few aberrations, particularly distortion, is obtained.

以下、前述の各条件式の技術的な説明をする。条件式（１）は、第１レンズ群Ｌ１内の物体側から像側へ順に配置された２枚のメニスカス形状の負レンズＧ１、負レンズＧ２の像側のレンズ面の曲率半径の比を規定している。条件式（１）は特に広角側において倍率色収差、像面湾曲、歪曲収差等を良好に補正するためのものである。   The technical explanation of each conditional expression described above will be given below. Conditional expression (1) defines the ratio of the curvature radii of the lens surfaces on the image side of the two meniscus negative lenses G1 and the negative lens G2 arranged in order from the object side to the image side in the first lens unit L1. is doing. Conditional expression (1) is for satisfactorily correcting chromatic aberration of magnification, curvature of field, distortion, etc., particularly on the wide angle side.

条件式（１）の下限値を下回ると、主に倍率色収差と像面湾曲が増加する。また、負レンズＧ１の像側のレンズ面の開角が大きくなるため、レンズの加工が困難となる。一方、条件式（１）の上限値を上回ると、負レンズＧ１が大型化し、全系の小型化が困難になる。また、有効径の大きい負レンズＧ１による倍率色収差、歪曲収差、像面湾曲等の補正効果が薄れ、これらの諸収差の補正が困難となる。さらに、負レンズＧ２の像側のレンズ面の開角が大きくなるため、レンズの加工が困難となる。   When the lower limit of conditional expression (1) is not reached, lateral chromatic aberration and field curvature mainly increase. In addition, since the opening angle of the lens surface on the image side of the negative lens G1 is increased, it becomes difficult to process the lens. On the other hand, if the upper limit value of conditional expression (1) is exceeded, the negative lens G1 becomes large and it becomes difficult to reduce the size of the entire system. In addition, correction effects such as lateral chromatic aberration, distortion, and field curvature due to the negative lens G1 having a large effective diameter are diminished, making it difficult to correct these various aberrations. Further, since the opening angle of the lens surface on the image side of the negative lens G2 becomes large, it becomes difficult to process the lens.

条件式（２）は全系の小型化及び超広角化を図るために、第１レンズ群Ｌ１の光軸上の厚さＤ１および、広角端における全系の焦点距離ｆｗの比を適切に定めている。条件式（２）の下限値を下回ると、広画角化した際の倍率色収差、歪曲収差、像面湾曲等の諸収差の第１レンズ群Ｌ１による補正効果が少なくなり、広画角化が困難となる。一方、条件式（２）の上限値を上回ると、広画角化した際に第１レンズ群Ｌ１のレンズ群厚みが大きくなり、全系の小型化が困難になる。   Conditional expression (2) appropriately determines the ratio of the thickness D1 on the optical axis of the first lens unit L1 and the focal length fw of the entire system at the wide-angle end in order to reduce the size and the super wide angle of the entire system. ing. If the lower limit of conditional expression (2) is not reached, the effect of correcting various aberrations such as chromatic aberration of magnification, distortion, and field curvature when the angle of view is widened is reduced by the first lens unit L1, and the angle of view is increased. It becomes difficult. On the other hand, if the upper limit of conditional expression (2) is exceeded, the lens group thickness of the first lens unit L1 increases when the angle of view is widened, making it difficult to downsize the entire system.

条件式（３）は、広角端におけるバックフォーカスと広角端における全系の焦点距離の比を適切に規定し、レンズ全長の短縮化を達成するためのものである。条件式（３）は特にレンズ全長、像面湾曲、コマ収差等の諸収差を良好に補正するためのものである。条件式（３）の下限値を下回り、バックフォーカスが短くなると、レンズ全長は短くなるが、像面湾曲の補正が困難となる。また、撮像面に入る光束の入射角度がきつくなるため、色ムラや周辺光量が低下してくる。一方、条件式（３）の上限値を上回り、バックフォーカスが長くなるとレンズ全長が増大するため好ましくない。また、コマ収差、歪曲収差の補正が困難となる。   Conditional expression (3) is to properly define the ratio of the back focus at the wide-angle end to the focal length of the entire system at the wide-angle end, thereby achieving a reduction in the total lens length. Conditional expression (3) is particularly for correcting various aberrations such as the total lens length, field curvature, and coma. If the lower limit of conditional expression (3) is not reached and the back focus is shortened, the total lens length is shortened, but it becomes difficult to correct field curvature. In addition, since the incident angle of the light beam entering the imaging surface becomes tight, color unevenness and peripheral light amount are reduced. On the other hand, if the upper limit of conditional expression (3) is exceeded and the back focus becomes longer, the total lens length increases, which is not preferable. In addition, it becomes difficult to correct coma and distortion.

各実施例では以上の如く構成することにより、全系が小型でありながら、撮像画角１００度を超える超広角で、かつ、歪曲収差の少ない高画質なズームレンズを得ている。尚、各実施例において、収差補正上更に好ましくは、条件式（１）乃至（３）の数値範囲を次の如く設定するのが良い。   In each embodiment, the zoom lens system having a high image quality with a super wide angle exceeding 100 degrees of field of view and less distortion is obtained by configuring as described above. In each embodiment, it is more preferable to set the numerical ranges of the conditional expressions (1) to (3) as follows in terms of aberration correction.

１．５５＜Ｇ１Ｒ２／Ｇ２Ｒ２＜４．００ ・・・（１ａ）
４．０＜Ｄ１／ｆｗ＜８．０ ・・・（２ａ）
０．８０＜ｂｆｗ／ｆｗ＜１．９５ ・・・（３ａ） 1.55 <G1R2 / G2R2 <4.00 (1a)
4.0 <D1 / fw <8.0 (2a)
0.80 <bfw / fw <1.95 (3a)

より更に好ましくは、条件式（１ａ）乃至（３ａ）の数値範囲を次の如く設定するのが良い。
１．６０＜Ｇ１Ｒ２／Ｇ２Ｒ２＜４．００ ・・・（１ｂ）
４．０＜Ｄ１／ｆｗ＜７．０ ・・・（２ｂ）
１．００＜ｂｆｗ／ｆｗ＜１．９２ ・・・（３ｂ） More preferably, the numerical ranges of the conditional expressions (1a) to (3a) are set as follows.
1.60 <G1R2 / G2R2 <4.00 (1b)
4.0 <D1 / fw <7.0 (2b)
1.00 <bfw / fw <1.92 (3b)

各実施例において更に好ましくは次の条件式のうち１つ以上を満足するのが良い。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とする。第１レンズ群Ｌ１には、負レンズＧ２の像側に隣接して配置された負レンズＧ３を有し、負レンズＧ３の像側のレンズ面の曲率半径をＧ３Ｒ２とする。負レンズＧ２の物体側のレンズ面の曲率半径をＧ２Ｒ１とする。負レンズＧ３の材料の屈折率をＮｄ１３、負レンズＧ３の材料のアッベ数をνｄ１３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, and the focal length of the second lens unit L2 is f2. The first lens unit L1 includes a negative lens G3 disposed adjacent to the image side of the negative lens G2, and the radius of curvature of the lens surface on the image side of the negative lens G3 is G3R2. Let G2R1 be the radius of curvature of the object-side lens surface of the negative lens G2. The refractive index of the material of the negative lens G3 is Nd13, and the Abbe number of the material of the negative lens G3 is νd13.

ズーミングに際して第１レンズ群Ｌ１は移動し、広角端から望遠端へのズーミングにおける第１レンズ群Ｌ１の移動量をＭ１とする。レンズ群の移動量の符号は広角端から望遠端へのズーミングによって移動した結果、その位置が広角端に比べて望遠端において物体側に位置するときを正、像側に位置するときを負とする。このとき、以下の条件式のうち１つ以上を満足することが好ましい。   The first lens unit L1 moves during zooming, and the amount of movement of the first lens unit L1 during zooming from the wide-angle end to the telephoto end is M1. The sign of the amount of movement of the lens group is positive when the zoom lens is moved from the wide-angle end to the telephoto end, and the position is closer to the object side at the telephoto end than the wide-angle end, and negative when it is located on the image side. To do. At this time, it is preferable to satisfy one or more of the following conditional expressions.

０．５＜｜ｆ１／ｆ２｜＜２．０ ・・・（４）
０．６＜Ｇ２Ｒ２／Ｇ３Ｒ２＜２．０ ・・・（５）
１．２＜（Ｇ２Ｒ１＋Ｇ１Ｒ２）／（Ｇ２Ｒ１―Ｇ１Ｒ２）＜１０．０・・・（６）
１．５５＜Ｎｄ１３＜１．６５ ・・・（７）
６５＜νｄ１３＜７５ ・・・（８）
−３．０＜Ｍ１／ｆｗ＜１．０ ・・・（９） 0.5 <| f1 / f2 | <2.0 (4)
0.6 <G2R2 / G3R2 <2.0 (5)
1.2 <(G2R1 + G1R2) / (G2R1-G1R2) <10.0 (6)
1.55 <Nd13 <1.65 (7)
65 <νd13 <75 (8)
−3.0 <M1 / fw <1.0 (9)

次に前述の各条件式の技術的意味について説明する。条件式（４）は全系の小型化を図るために、第１レンズ群Ｌ１の焦点距離と第２レンズ群Ｌ２の焦点距離の比を適切に規定している。   Next, the technical meaning of each conditional expression described above will be described. Conditional expression (4) appropriately defines the ratio of the focal length of the first lens unit L1 and the focal length of the second lens unit L2 in order to reduce the size of the entire system.

条件式（４）の下限を超えて第１レンズ群Ｌ１の負の焦点距離の絶対値が第２レンズ群Ｌ２の正の焦点距離の絶対値に比べて小さくなりすぎると、バックフォーカスが長くなり、結果的にレンズ全長が長くなり、全系の小型化が困難になる。条件式（４）の上限を超えて第１レンズ群Ｌ１の負の焦点距離の絶対値が第２レンズ群Ｌ２の正の焦点距離の絶対値に比べて大きくなりすぎると、前玉有効径が増大してくる。また、バックフォーカスが短くなるため、像面湾曲の補正が困難になる。   If the absolute value of the negative focal length of the first lens unit L1 is too small compared to the absolute value of the positive focal length of the second lens unit L2 beyond the lower limit of the conditional expression (4), the back focus becomes longer. As a result, the overall length of the lens becomes long, and it is difficult to reduce the size of the entire system. If the absolute value of the negative focal length of the first lens unit L1 exceeds the upper limit of the conditional expression (4) and becomes too large compared to the absolute value of the positive focal length of the second lens unit L2, the front lens effective diameter is increased. It will increase. In addition, since the back focus is shortened, it is difficult to correct curvature of field.

条件式（５）は、第１レンズ群Ｌ１内の物体側から像側へ順に第２番目の負レンズＧ２の像側のレンズ面の曲率半径と第３番目の負レンズＧ３の像側のレンズ面の曲率半径の比を規定している。特に広角側において倍率色収差、像面湾曲、歪曲収差等を良好に補正するためのものである。条件式（５）の下限値を下回ると、主に広角端のズーム付近において倍率色収差と像面湾曲が増加する。また、負レンズＧ３の像側のレンズ面の開角が大きくなるため、レンズの加工が困難となる。   Conditional expression (5) indicates that the radius of curvature of the image-side lens surface of the second negative lens G2 and the image-side lens of the third negative lens G3 in order from the object side to the image side in the first lens unit L1. Specifies the ratio of the curvature radii of the surface. In particular, it is intended to satisfactorily correct lateral chromatic aberration, curvature of field, distortion and the like on the wide angle side. If the lower limit value of conditional expression (5) is not reached, lateral chromatic aberration and curvature of field increase mainly near the zoom at the wide-angle end. In addition, since the opening angle of the lens surface on the image side of the negative lens G3 is increased, it becomes difficult to process the lens.

一方、条件式（５）の上限値を上回ると、負レンズＧ２が大型化し、全系の小型化が困難になる。また、有効径の大きい負レンズＧ２による倍率色収差、歪曲収差、像面湾曲等の補正が困難となる。さらに、負レンズＧ３の像側のレンズ面の開角が大きくなるため、レンズの加工が困難となる。   On the other hand, if the upper limit value of conditional expression (5) is exceeded, the negative lens G2 becomes large and it becomes difficult to reduce the size of the entire system. In addition, it becomes difficult to correct lateral chromatic aberration, distortion, field curvature, and the like by the negative lens G2 having a large effective diameter. Further, since the opening angle of the lens surface on the image side of the negative lens G3 is increased, it becomes difficult to process the lens.

条件式（６）は超広角化を図りつつ歪曲収差を良好に補正するために、第１レンズＧ１と第２レンズＧ２で形成される空気間隔のシェイプファクター（形状）を適切に定めている。条件式（６）の下限値を下回ると、広角端において歪曲収差および倍率色収差の補正が困難になる。また、負レンズおよび負レンズＧ２の有効径が大型化してしまい、全系の小型化が困難になる。条件式（６）の上限値を上回ると、負レンズＧ１と負レンズＧ２による主に広角端のズーム付近における像面湾曲の補正が困難となる。また負レンズＧ１の像側のレンズ面の開角が大きくなり、加工が困難となる。   Conditional expression (6) appropriately determines the shape factor (shape) of the air gap formed by the first lens G1 and the second lens G2 in order to satisfactorily correct distortion while achieving an ultra-wide angle. Below the lower limit of conditional expression (6), it becomes difficult to correct distortion and lateral chromatic aberration at the wide-angle end. Further, the effective diameters of the negative lens and the negative lens G2 are increased, and it is difficult to reduce the entire system. Exceeding the upper limit of conditional expression (6) makes it difficult to correct curvature of field mainly in the vicinity of the zoom at the wide-angle end by the negative lens G1 and the negative lens G2. In addition, the opening angle of the lens surface on the image side of the negative lens G1 becomes large, and processing becomes difficult.

条件式（７）、（８）は前玉有効径の小型化を図りつつ、広角端のズーム付近における倍率色収差の補正を良好に行うためのものである。条件式（７）、（８）は第１レンズ群Ｌ１中の負レンズＧ３の材料の屈折率およびアッベ数を規定している。条件式（７）の下限値を下回ると、負レンズＧ３の有効径が大きくなり、広画角化していくと前玉有効径が大きくなり、全系の小型化が困難になる。条件式（７）の上限値を上回ると、第１レンズ群Ｌ１内の負の屈折力が大きくなりすぎて、主に像面湾曲が正の方向に増大し、この補正が困難となる。   Conditional expressions (7) and (8) are intended to satisfactorily correct lateral chromatic aberration in the vicinity of the zoom at the wide-angle end while reducing the effective diameter of the front lens. Conditional expressions (7) and (8) define the refractive index and Abbe number of the material of the negative lens G3 in the first lens unit L1. If the lower limit of conditional expression (7) is not reached, the effective diameter of the negative lens G3 increases, and the effective diameter of the front lens increases as the field angle increases, making it difficult to downsize the entire system. If the upper limit value of conditional expression (7) is exceeded, the negative refractive power in the first lens unit L1 becomes too large, and the field curvature mainly increases in the positive direction, making this correction difficult.

条件式（８）の下限値を下回ると、広角端のズーム付近において倍率色収差の補正が困難となる。条件式（８）の上限値を上回ると、望遠端のズーム付近において倍率色収差の補正が困難となる。   If the lower limit value of conditional expression (8) is not reached, it will be difficult to correct lateral chromatic aberration near the zoom at the wide-angle end. If the upper limit value of conditional expression (8) is exceeded, it will be difficult to correct lateral chromatic aberration near the zoom at the telephoto end.

条件式（９）は全系の小型化を図りつつ、高ズーム比化を図るために、ズーミングにおける第１レンズ群Ｌ１の移動量と広角端における全系の焦点距離の比を適切に定めたものである。条件式（９）の下限値を下回ると、広角端におけるレンズ全長が長くなり、また前玉有効径が大きくなるため、全系の小型化が困難になる。また有効径が大きい第１レンズ群Ｌ１の移動量が大きくなるため、ズーミングに際して像揺れが増大してくるので良くない。条件式（９）の上限値を上回ると、望遠端におけるレンズ全長が長くなり、各レンズ群を沈胴した際の全系の小型化が困難になる。   Conditional expression (9) appropriately determines the ratio of the amount of movement of the first lens unit L1 during zooming to the focal length of the entire system at the wide-angle end in order to increase the zoom ratio while reducing the size of the entire system. Is. If the lower limit value of conditional expression (9) is not reached, the total lens length at the wide-angle end becomes long, and the effective diameter of the front lens becomes large, making it difficult to downsize the entire system. In addition, since the moving amount of the first lens unit L1 having a large effective diameter becomes large, image shake increases during zooming, which is not good. If the upper limit value of conditional expression (9) is exceeded, the total lens length at the telephoto end becomes long, and it becomes difficult to downsize the entire system when each lens group is retracted.

尚、各実施例において、収差補正上更に好ましくは、条件式（４）乃至（９）の数値範囲を次の如く設定するのが良い。   In each embodiment, it is more preferable to set the numerical ranges of the conditional expressions (4) to (9) as follows in terms of aberration correction.

０．５１＜｜ｆ１／ｆ２｜＜２．００ ・・・（４ａ）
０．６５＜Ｇ２Ｒ２／Ｇ３Ｒ２＜２．００ ・・・（５ａ）
１．３＜（Ｇ２Ｒ１＋Ｇ１Ｒ２）／（Ｇ２Ｒ１―Ｇ１Ｒ２）＜８．０・・・（６ａ）
１．５７＜Ｎｄ１３＜１．６５ ・・・（７ａ）
６６．０＜νｄ１３＜７５．０ ・・・（８ａ）
−３．０＜Ｍ１／ｆｗ＜０．８０ ・・・（９ａ） 0.51 <| f1 / f2 | <2.00 (4a)
0.65 <G2R2 / G3R2 <2.00 (5a)
1.3 <(G2R1 + G1R2) / (G2R1-G1R2) <8.0 (6a)
1.57 <Nd13 <1.65 (7a)
66.0 <νd13 <75.0 (8a)
−3.0 <M1 / fw <0.80 (9a)

より更に好ましくは、条件式（４ａ）乃至（９ａ）の数値範囲を次の如く設定するのが良い。
０．５１５＜｜ｆ１／ｆ２｜＜１．５００ ・・・（４ｂ）
０．６５＜Ｇ２Ｒ２／Ｇ３Ｒ２＜１．５０ ・・・（５ｂ）
１．４＜（Ｇ２Ｒ１＋Ｇ１Ｒ２）／（Ｇ２Ｒ１―Ｇ１Ｒ２）＜４．３・・・（６ｂ）
１．５８＜Ｎｄ１３＜１．６３ ・・・（７ｂ）
６６．０＜νｄ１３＜７１．０ ・・・（８ｂ）
−２．８＜Ｍ１／ｆｗ＜０．６０ ・・・（９ｂ） More preferably, the numerical ranges of the conditional expressions (4a) to (9a) are set as follows.
0.515 <| f1 / f2 | <1.500 (4b)
0.65 <G2R2 / G3R2 <1.50 (5b)
1.4 <(G2R1 + G1R2) / (G2R1-G1R2) <4.3 (6b)
1.58 <Nd13 <1.63 (7b)
66.0 <νd13 <71.0 (8b)
-2.8 <M1 / fw <0.60 (9b)

各実施例において更に好ましくは、第１レンズ群Ｌ１は広角端において倍率色収差、歪曲収差を補正しつつ、全系の小型化を図るために、物体側から像側へ順に３枚以上の負レンズと１以上の正レンズで構成するのが良い。また、前玉有効径の小型化のためには第１レンズ群Ｌ１および、第２レンズ群Ｌ２のレンズ群間に補助絞りＦＰ１を配置し、ズーミングに際して各レンズ群とは別体で移動させることが好ましい。   More preferably in each embodiment, the first lens unit L1 includes three or more negative lenses in order from the object side to the image side in order to reduce the size of the entire system while correcting lateral chromatic aberration and distortion at the wide angle end. And one or more positive lenses. In order to reduce the effective diameter of the front lens, an auxiliary aperture FP1 is disposed between the lens groups of the first lens unit L1 and the second lens unit L2, and is moved separately from each lens unit during zooming. Is preferred.

さらに、ズーム全域で倍率色収差を良好に補正するために、第２レンズ群Ｌ２内に負レンズと正レンズを接合した接合レンズを配置するのが良い。   Further, in order to satisfactorily correct lateral chromatic aberration over the entire zoom range, it is preferable to arrange a cemented lens in which a negative lens and a positive lens are cemented in the second lens unit L2.

尚、各実施例のズームレンズを有する撮像装置においては、諸収差のうち歪曲収差の補正を電気的な画像処理によって補正しても良い。特に広角側は撮像素子の有効撮像範囲に対して望遠側に比べて小さい撮像範囲とし、歪曲収差の補正をしても良く、これによれば、前玉有効径の小型化が容易になる。即ち、広角端における有効像円径が望遠端における有効像円径よりも小さいことが良い。   In the imaging apparatus having the zoom lens of each embodiment, correction of distortion among various aberrations may be corrected by electrical image processing. In particular, the wide-angle side may have a smaller imaging range than the telephoto side with respect to the effective imaging range of the imaging element, and distortion aberration may be corrected. According to this, the front lens effective diameter can be easily reduced. That is, it is preferable that the effective image circle diameter at the wide-angle end is smaller than the effective image circle diameter at the telephoto end.

各実施例においては、像ぶれ補正に際して第２レンズ群Ｌ２を光軸に対し垂直方向の成分を持つように移動させている。即ち光軸に対し垂直方向に像を変移させても良い。これによればズームレンズ全体が振動（傾動）したときの撮影画像のぶれを良好に補正することができる。   In each embodiment, the second lens unit L2 is moved so as to have a component in a direction perpendicular to the optical axis during image blur correction. That is, the image may be shifted in the direction perpendicular to the optical axis. According to this, it is possible to satisfactorily correct the blur of the captured image when the entire zoom lens vibrates (tilts).

各実施例では、可変頂角プリズム等の光学部材や防振のためのレンズ群を新たに付加することなく防振を行うようにし、これによって全体が大型化するのを防止している。なお、各実施例では第２レンズ群Ｌ２の全体または一部を光軸と垂直方向に移動させて防振を行っているが、移動方式は第２レンズ群Ｌ２を光軸に対して垂直方向の成分を持つように移動させれば、画像のぶれを補正することができる。   In each embodiment, image stabilization is performed without newly adding an optical member such as a variable apex angle prism or a lens group for image stabilization, thereby preventing an increase in size as a whole. In each of the embodiments, the whole or a part of the second lens unit L2 is moved in the direction perpendicular to the optical axis to perform the image stabilization. However, the moving method uses the second lens unit L2 in the direction perpendicular to the optical axis. If it is moved so as to have this component, it is possible to correct image blur.

例えば鏡筒構造の複雑化を許容すれば、光軸上に回転中心を持つように第２レンズ群Ｌ２を回動させて防振を行っても良い。なお、各実施例において開口絞りＳＰはズーミングに際して第２レンズ群Ｌ２と一体移動している。また、補助絞りＦＰ１を第１レンズ群Ｌ１および第２レンズ群Ｌ２の間に配置し、各レンズ群とは別体で移動させている。   For example, if the lens barrel structure is allowed to be complicated, the second lens unit L2 may be rotated so as to have a center of rotation on the optical axis, thereby performing vibration isolation. In each embodiment, the aperture stop SP moves integrally with the second lens unit L2 during zooming. Further, the auxiliary diaphragm FP1 is disposed between the first lens group L1 and the second lens group L2, and is moved separately from each lens group.

これにより、広角端近傍に付近における第１レンズ群Ｌ１および第２レンズ群Ｌ２の有効レンズ径の小型化を行い、超広角化かつ小型化を実現している。第１レンズ群Ｌ１の有効レンズ径を小型化するためには、第１レンズ群Ｌ１を構成するレンズの数が少ない方が好ましい。   As a result, the effective lens diameters of the first lens unit L1 and the second lens unit L2 near the wide-angle end are reduced, and an ultra-wide angle and a reduction in size are realized. In order to reduce the effective lens diameter of the first lens unit L1, it is preferable that the number of lenses constituting the first lens unit L1 is small.

実施例１、２、４、５では第１レンズ群Ｌ１は物体側から像側へ順に、負、負、負、正レンズの４枚のレンズで構成し、実施例３では負、負、負、負、正レンズの５枚のレンズで構成している。これにより第１レンズ群Ｌ１を小型にしつつ、超広角化に伴い発生する倍率色収差を良好に補正している。小型化のためには第１レンズ群Ｌ１内の負レンズはすべて物体側に凸面を向けた負メニスカスレンズあることが好ましい。   In Examples 1, 2, 4, and 5, the first lens unit L1 is composed of four lenses of negative, negative, negative, and positive lenses in order from the object side to the image side. In Example 3, negative, negative, and negative lenses are used. It consists of five lenses, negative and positive lenses. This makes it possible to satisfactorily correct the lateral chromatic aberration that occurs with the widening of the angle while reducing the size of the first lens unit L1. In order to reduce the size, it is preferable that all negative lenses in the first lens unit L1 are negative meniscus lenses having a convex surface directed toward the object side.

実施例１乃至３、５では第２レンズ群Ｌ２は正レンズ、負レンズ、正レンズ、負レンズと正レンズを接合した接合レンズ、負レンズより構成している。実施例４では正レンズ、負レンズ、正レンズ、負レンズと正レンズを接合した接合レンズより構成している。第２レンズ群Ｌ２中に負レンズと正レンズを接合した接合レンズを用いることにより、ズーム全域における倍率色収差を良好に補正している。第２レンズ群Ｌ２は１以上の非球面を有している。これにより、望遠端における球面収差を良好に補正している。   In the first to third and fifth embodiments, the second lens unit L2 includes a positive lens, a negative lens, a positive lens, a cemented lens in which a negative lens and a positive lens are cemented, and a negative lens. The fourth exemplary embodiment includes a positive lens, a negative lens, a positive lens, and a cemented lens in which a negative lens and a positive lens are cemented. By using a cemented lens in which a negative lens and a positive lens are cemented in the second lens unit L2, the chromatic aberration of magnification in the entire zoom range is favorably corrected. The second lens unit L2 has one or more aspheric surfaces. Thereby, the spherical aberration at the telephoto end is corrected well.

実施例１乃至３、５では第３レンズ群Ｌ３を１枚の正レンズより構成している。実施例４では第３レンズ群Ｌ３を１枚の負レンズで構成している。これにより、小型化かつ高ズーム比化を図っている。実施例１乃至５ではフォーカスレンズ群を１枚の正レンズで構成している。これにより、フォーカスレンズ群の高速化、軽量化を図っている。   In Examples 1 to 3, and 5, the third lens unit L3 is composed of one positive lens. In Example 4, the third lens unit L3 is composed of one negative lens. As a result, the size is reduced and the zoom ratio is increased. In Examples 1 to 5, the focus lens group is composed of one positive lens. As a result, the focus lens group is increased in speed and weight.

各実施例では以上のように各レンズ群を構成することによって、全系が小型でありながら撮像画角１００°を超える超広画角で歪曲収差が比較的少なく良好な光学性能のズームレンズ及びそれを有する撮像装置を得ている。   In each embodiment, each lens group is configured as described above, so that the entire system is small, but the zoom lens has a super-wide field angle exceeding 100 ° and a relatively small distortion and a good optical performance. An imaging device having the same is obtained.

次に本発明のズームレンズを撮像光学系として用いた撮像装置（デジタルカメラ）の実施例を図１１を用いて説明する。図１１において、３０はカメラ本体、３１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像光学系である。３２はカメラ本体に内蔵され、撮像光学系３１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。３３は固体撮像素子３２によって光電変換された被写体像に対応する情報を記録するメモリである。   Next, an embodiment of an image pickup apparatus (digital camera) using the zoom lens of the present invention as an image pickup optical system will be described with reference to FIG. In FIG. 11, reference numeral 30 denotes a camera body, and 31 denotes an imaging optical system constituted by any of the zoom lenses described in the first to fifth embodiments. Reference numeral 32 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 imaging optical system 31 and is built in the camera body. Reference numeral 33 denotes a memory for recording information corresponding to the subject image photoelectrically converted by the solid-state image sensor 32.

このように本発明のズームレンズをデジタルスチルカメラやビデオカメラ等の撮像装置に適用することにより、小型で高い光学性能を有する撮像装置が実現できる。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。   In this way, by applying the zoom lens of the present invention to an imaging apparatus such as a digital still camera or a video camera, an imaging apparatus having a small size and high optical performance can be realized. In addition, the zoom lens of each embodiment can also be used as a projection optical system for a projection apparatus (projector).

次に、本発明の実施例１乃至５に対応する数値データ１乃至５を示す。各数値データにおいて、ｉは物体からの面の順番を示す。ｒｉはレンズ面の曲率半径、ｄｉは第ｉ面と第ｉ＋１面との間の面を示す。ｎｄｉ、νｄｉはそれぞれｄ線を基準とした第ｉ番目の光学部材の屈折率と、アッベ数である。 各実施例において、バックフォーカス（ＢＦ）はレンズ最終面から近軸像面までの距離を空気換算長により表したものである。   Next, numerical data 1 to 5 corresponding to the first to fifth embodiments of the present invention are shown. In each numerical data, i indicates the order of the surface from the object. ri represents the radius of curvature of the lens surface, and di represents the surface between the i-th surface and the i + 1-th surface. ndi and νdi are the refractive index and the Abbe number of the i-th optical member based on the d-line, respectively. In each embodiment, the back focus (BF) represents the distance from the lens final surface to the paraxial image surface by an air-converted length.

レンズ全長は最も物体側の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を加えたものである。非球面形状は光軸からの高さｈの位置での光軸方向の変位を面頂点を基準にしてｘとする。   The total lens length is the distance from the lens surface closest to the object side to the final lens surface plus back focus. In the aspherical shape, the displacement in the optical axis direction at the position of the height h from the optical axis is set to x with reference to the surface vertex.

このとき、
x＝（ｈ2／Ｒ）／[１+{１−(１+K)(ｈ/Ｒ)2}1/2]＋A4ｈ4＋A6ｈ6＋A8ｈ8＋A10ｈ10
で表される。但し、Kは円錐定数、A4、A6、A8、A10は4次、6次、8次、10次の非球面係数、Ｒは近軸曲率半径である。又、「ｅ−Ｘ」は「×１０−X」を意味している。非球面は各表中の面番号の右側に＊印を付している。又、前述の各条件式と各実施例との関係を表１に示す。 At this time,
x = (h 2 / R) / [1+ {1− (1 + K) (h / R) 2 } 1/2 ] + A4h 4 + A6h 6 + A8h 8 + A10h 10
It is represented by Where K is a conic constant, A4, A6, A8, and A10 are fourth-order, sixth-order, eighth-order, and tenth-order aspheric coefficients, and R is a paraxial radius of curvature. “E-X” means “× 10 −X ”. An aspherical surface is marked with * on the right side of the surface number in each table. Table 1 shows the relationship between the above-described conditional expressions and the respective examples.

［数値データ１］
単位 mm

面データ
面番号 r d nd νd
1 27.760 1.45 1.69680 55.5
2 12.883 5.06
3 25.811 0.80 1.76802 49.2
4* 7.127 4.61
5 34.587 0.80 1.59201 67.0
6* 10.672 3.01
7 14.389 3.40 1.85478 24.8
8 32.090 (可変)
9(補助絞り）∞ (可変)
10(開口絞り) ∞ 1.87
11 11.769 2.20 1.67270 32.1
12 -11.941 0.80
13 -8.543 0.45 1.91082 35.3
14 15.090 0.80
15(補助絞り）∞ 0.00
16* 9.866 3.60 1.49710 81.6
17* -9.602 0.50
18 13.370 0.50 1.88300 40.8
19 6.822 5.50 1.49700 81.5
20 -11.865 0.93
21* -248.215 0.70 1.85135 40.1
22* 16.554 (可変)
23* 17.945 4.50 1.53110 55.9
24* -129.766 (可変)
25 ∞ 1.00 1.51633 64.1
26 ∞ 1.00
像面 ∞
[Numeric data 1]
Unit mm

Surface data surface number rd nd νd
1 27.760 1.45 1.69680 55.5
2 12.883 5.06
3 25.811 0.80 1.76802 49.2
4 * 7.127 4.61
5 34.587 0.80 1.59201 67.0
6 * 10.672 3.01
7 14.389 3.40 1.85478 24.8
8 32.090 (variable)
9 (auxiliary aperture) ∞ (variable)
10 (Aperture stop) ∞ 1.87
11 11.769 2.20 1.67270 32.1
12 -11.941 0.80
13 -8.543 0.45 1.91082 35.3
14 15.090 0.80
15 (auxiliary aperture) ∞ 0.00
16 * 9.866 3.60 1.49710 81.6
17 * -9.602 0.50
18 13.370 0.50 1.88300 40.8
19 6.822 5.50 1.49700 81.5
20 -11.865 0.93
21 * -248.215 0.70 1.85135 40.1
22 * 16.554 (variable)
23 * 17.945 4.50 1.53110 55.9
24 * -129.766 (variable)
25 ∞ 1.00 1.51633 64.1
26 ∞ 1.00
Image plane ∞

非球面データ
第4面
K =-2.44642e+000 A 4= 3.34698e-004 A 6=-1.84192e-006 A 8= 2.29346e-008 A10=-7.80820e-012

第6面
K = 0.00000e+000 A 4= 5.36206e-005 A 6=-2.61064e-006 A 8= 6.29865e-010

第16面
K = 0.00000e+000 A 4=-4.15358e-004 A 6= 2.49230e-006 A 8=-7.82238e-008

第17面
K = 0.00000e+000 A 4=-7.31779e-005 A 6= 1.09202e-006 A 8=-5.51957e-008

第21面
K = 0.00000e+000 A 4=-6.91130e-005 A 6=-3.30701e-006

第22面
K = 0.00000e+000 A 4= 1.83165e-004 A 6=-1.98407e-006 A 8= 1.17227e-008

第23面
K = 0.00000e+000 A 4= 3.05014e-005 A 6=-6.34422e-007

第24面
K = 0.00000e+000 A 4= 3.17843e-004 A 6=-5.87782e-006 A 8= 2.40121e-008
Aspheric data 4th surface
K = -2.44642e + 000 A 4 = 3.34698e-004 A 6 = -1.84192e-006 A 8 = 2.29346e-008 A10 = -7.80820e-012

6th page
K = 0.00000e + 000 A 4 = 5.36206e-005 A 6 = -2.61064e-006 A 8 = 6.29865e-010

16th page
K = 0.00000e + 000 A 4 = -4.15358e-004 A 6 = 2.49230e-006 A 8 = -7.82238e-008

17th page
K = 0.00000e + 000 A 4 = -7.31779e-005 A 6 = 1.09202e-006 A 8 = -5.51957e-008

21st page
K = 0.00000e + 000 A 4 = -6.91130e-005 A 6 = -3.30701e-006

22nd page
K = 0.00000e + 000 A 4 = 1.83165e-004 A 6 = -1.98407e-006 A 8 = 1.17227e-008

23rd page
K = 0.00000e + 000 A 4 = 3.05014e-005 A 6 = -6.34422e-007

24th page
K = 0.00000e + 000 A 4 = 3.17843e-004 A 6 = -5.87782e-006 A 8 = 2.40121e-008

各種データ
ズーム比 2.26
広角 中間 望遠
焦点距離 3.77 6.50 8.52
Fナンバー 4.12 4.12 4.12
半画角（度） 60.08 49.07 42.81
像高 6.55 7.50 7.89
レンズ全長 67.90 64.36 65.51
BF 6.32 5.32 4.75

d 8 13.17 4.99 1.50
d 9 4.30 2.07 2.05
d22 2.63 10.50 15.72
d24 4.66 3.66 3.09

レンズ群データ
群 始面 焦点距離
1 1 -9.12
2 9 ∞
3 10 15.61
4 23 30.00
5 25 ∞
Various data Zoom ratio 2.26
Wide angle Medium telephoto focal length 3.77 6.50 8.52
F number 4.12 4.12 4.12
Half angle of view (degrees) 60.08 49.07 42.81
Image height 6.55 7.50 7.89
Total lens length 67.90 64.36 65.51
BF 6.32 5.32 4.75

d 8 13.17 4.99 1.50
d 9 4.30 2.07 2.05
d22 2.63 10.50 15.72
d24 4.66 3.66 3.09

Lens group data group Start surface Focal length
1 1 -9.12
2 9 ∞
3 10 15.61
4 23 30.00
5 25 ∞

［数値データ２］
単位 mm

面データ
面番号 r d nd νd
1 21.480 1.45 1.69680 55.5
2 12.646 4.18
3 20.816 0.80 1.76802 49.2
4* 7.870 5.38
5 794.407 0.80 1.59201 67.0
6* 9.511 2.81
7 13.254 3.00 1.85478 24.8
8 29.321 (可変)
9(補助絞り）∞ (可変)
10(開口絞り) ∞ 0.18
11 16.049 2.20 1.67270 32.1
12 -12.666 0.80
13 -8.162 0.45 1.91082 35.3
14 25.396 0.80
15(補助絞り）∞ 0.00
16* 10.834 3.10 1.49710 81.6
17* -8.707 0.50
18 11.602 0.50 1.88300 40.8
19 6.895 5.50 1.49700 81.5
20 -40.481 2.00
21* -7.545 0.70 1.85135 40.1
22* -12.165 (可変)
23* 16.007 4.50 1.53110 55.9
24* -3101.840 (可変)
25 ∞ 1.00 1.51633 64.1
26 ∞ 1.00
像面 ∞
[Numeric data 2]
Unit mm

Surface data surface number rd nd νd
1 21.480 1.45 1.69680 55.5
2 12.646 4.18
3 20.816 0.80 1.76802 49.2
4 * 7.870 5.38
5 794.407 0.80 1.59201 67.0
6 * 9.511 2.81
7 13.254 3.00 1.85478 24.8
8 29.321 (variable)
9 (auxiliary aperture) ∞ (variable)
10 (Aperture stop) ∞ 0.18
11 16.049 2.20 1.67270 32.1
12 -12.666 0.80
13 -8.162 0.45 1.91082 35.3
14 25.396 0.80
15 (auxiliary aperture) ∞ 0.00
16 * 10.834 3.10 1.49710 81.6
17 * -8.707 0.50
18 11.602 0.50 1.88300 40.8
19 6.895 5.50 1.49700 81.5
20 -40.481 2.00
21 * -7.545 0.70 1.85135 40.1
22 * -12.165 (variable)
23 * 16.007 4.50 1.53110 55.9
24 * -3101.840 (variable)
25 ∞ 1.00 1.51633 64.1
26 ∞ 1.00
Image plane ∞

非球面データ
第4面
K =-2.44642e+000 A 4= 3.66963e-004 A 6=-2.58745e-006 A 8= 1.64207e-008 A10= 2.25860e-011

第6面
K = 0.00000e+000 A 4= 2.19393e-005 A 6=-9.44009e-008 A 8=-2.52417e-008

第16面
K = 0.00000e+000 A 4=-2.51606e-004 A 6= 6.69996e-007 A 8=-3.52122e-008

第17面
K = 0.00000e+000 A 4=-8.74102e-005 A 6= 2.67674e-006 A 8=-1.02348e-009

第21面
K = 0.00000e+000 A 4= 1.75660e-003 A 6=-2.17583e-005

第22面
K = 0.00000e+000 A 4= 1.68633e-003 A 6=-1.99741e-005 A 8= 1.65009e-008

第23面
K = 0.00000e+000 A 4= 5.34164e-005 A 6=-3.02585e-008

第24面
K = 0.00000e+000 A 4= 2.33932e-004 A 6=-1.46642e-006 A 8= 3.64524e-010
Aspheric data 4th surface
K = -2.44642e + 000 A 4 = 3.66963e-004 A 6 = -2.58745e-006 A 8 = 1.64207e-008 A10 = 2.25860e-011

6th page
K = 0.00000e + 000 A 4 = 2.19393e-005 A 6 = -9.44009e-008 A 8 = -2.52417e-008

16th page
K = 0.00000e + 000 A 4 = -2.51606e-004 A 6 = 6.69996e-007 A 8 = -3.52122e-008

17th page
K = 0.00000e + 000 A 4 = -8.74102e-005 A 6 = 2.67674e-006 A 8 = -1.02348e-009

21st page
K = 0.00000e + 000 A 4 = 1.75660e-003 A 6 = -2.17583e-005

22nd page
K = 0.00000e + 000 A 4 = 1.68633e-003 A 6 = -1.99741e-005 A 8 = 1.65009e-008

23rd page
K = 0.00000e + 000 A 4 = 5.34164e-005 A 6 = -3.02585e-008

24th page
K = 0.00000e + 000 A 4 = 2.33932e-004 A 6 = -1.46642e-006 A 8 = 3.64524e-010

各種データ
ズーム比 2.36
広角 中間 望遠
焦点距離 4.50 6.09 10.60
Fナンバー 4.12 4.12 4.12
半画角（度） 55.51 50.89 36.67
像高 6.55 7.50 7.89
レンズ全長 67.40 65.33 69.07
BF 5.57 5.52 4.75

d 8 12.82 4.26 1.50
d 9 4.59 7.26 3.22
d22 4.77 8.64 19.95
d24 3.91 3.86 3.09

レンズ群データ
群 始面 焦点距離
1 1 -9.12
2 9 ∞
3 10 15.61
4 23 30.00
5 25 ∞
Various data Zoom ratio 2.36
Wide angle Medium telephoto focal length 4.50 6.09 10.60
F number 4.12 4.12 4.12
Half angle of view (degrees) 55.51 50.89 36.67
Image height 6.55 7.50 7.89
Total lens length 67.40 65.33 69.07
BF 5.57 5.52 4.75

d 8 12.82 4.26 1.50
d 9 4.59 7.26 3.22
d22 4.77 8.64 19.95
d24 3.91 3.86 3.09

Lens group data group Start surface Focal length
1 1 -9.12
2 9 ∞
3 10 15.61
4 23 30.00
5 25 ∞

［数値データ３］
単位 mm

面データ
面番号 r d nd νd
1 26.228 1.45 1.80400 46.6
2 16.057 6.20
3 91.128 0.70 1.58313 59.4
4* 7.142 3.60
5 24.994 0.80 1.59522 67.7
6* 9.631 3.90
7 45.524 0.50 1.59282 68.6
8 15.678 0.10
9 14.070 3.00 1.95375 32.3
10 71.270 (可変)
11(補助絞り）∞ (可変)
12(開口絞り) ∞ 0.50
13 13.680 2.20 1.60342 38.0
14 -10.766 0.54
15 -7.428 0.45 1.91082 35.3
16 415.684 0.80
17(補助絞り）∞ 0.00
18 7.803 0.45 1.91082 35.3
19 6.530 3.00 1.49700 81.5
20* -8.112 1.10
21 9.999 3.50 1.49700 81.5
22 -5.268 0.45 1.80400 46.6
23 34.953 1.40
24 -70.025 0.70 1.58313 59.4
25* 229.017 (可変)
26 -318.666 3.00 1.53110 55.9
27* -14.236 (可変)
28 ∞ 1.00 1.51633 64.1
29 ∞ 1.00
像面 ∞
[Numeric data 3]
Unit mm

Surface data surface number rd nd νd
1 26.228 1.45 1.80 400 46.6
2 16.057 6.20
3 91.128 0.70 1.58313 59.4
4 * 7.142 3.60
5 24.994 0.80 1.59522 67.7
6 * 9.631 3.90
7 45.524 0.50 1.59282 68.6
8 15.678 0.10
9 14.070 3.00 1.95375 32.3
10 71.270 (variable)
11 (auxiliary aperture) ∞ (variable)
12 (Aperture stop) ∞ 0.50
13 13.680 2.20 1.60342 38.0
14 -10.766 0.54
15 -7.428 0.45 1.91082 35.3
16 415.684 0.80
17 (auxiliary aperture) ∞ 0.00
18 7.803 0.45 1.91082 35.3
19 6.530 3.00 1.49700 81.5
20 * -8.112 1.10
21 9.999 3.50 1.49700 81.5
22 -5.268 0.45 1.80 400 46.6
23 34.953 1.40
24 -70.025 0.70 1.58313 59.4
25 * 229.017 (variable)
26 -318.666 3.00 1.53110 55.9
27 * -14.236 (variable)
28 ∞ 1.00 1.51633 64.1
29 ∞ 1.00
Image plane ∞

非球面データ
第4面
K =-2.44642e+000 A 4= 3.75721e-004 A 6=-6.42404e-006 A 8= 6.87871e-008 A10=-2.48868e-010

第6面
K = 0.00000e+000 A 4= 8.46805e-005 A 6=-1.51040e-007 A 8=-2.74332e-008

第20面
K = 0.00000e+000 A 4= 1.25887e-004 A 6= 5.80499e-006 A 8= 1.96175e-007

第25面
K = 0.00000e+000 A 4= 9.28606e-004 A 6= 8.37906e-006 A 8=-2.44335e-008

第27面
K = 0.00000e+000 A 4= 3.55622e-004 A 6=-2.39482e-006 A 8= 5.21421e-009
Aspheric data 4th surface
K = -2.44642e + 000 A 4 = 3.75721e-004 A 6 = -6.42404e-006 A 8 = 6.87871e-008 A10 = -2.48868e-010

6th page
K = 0.00000e + 000 A 4 = 8.46805e-005 A 6 = -1.51040e-007 A 8 = -2.74332e-008

20th page
K = 0.00000e + 000 A 4 = 1.25887e-004 A 6 = 5.80499e-006 A 8 = 1.96175e-007

25th page
K = 0.00000e + 000 A 4 = 9.28606e-004 A 6 = 8.37906e-006 A 8 = -2.44335e-008

27th page
K = 0.00000e + 000 A 4 = 3.55622e-004 A 6 = -2.39482e-006 A 8 = 5.21421e-009

各種データ
ズーム比 2.24
広角 中間 望遠
焦点距離 3.79 6.09 8.49
Fナンバー 4.12 4.12 4.12
半画角（度） 59.92 50.60 42.92
像高 6.55 7.42 7.89
レンズ全長 61.68 53.58 51.51
BF 3.42 3.36 3.31

d10 14.13 4.55 1.00
d11 3.63 2.12 0.50
d25 2.16 5.21 8.36
d27 1.76 1.70 1.65

レンズ群データ
群 始面 焦点距離
1 1 -10.53
2 11 ∞
3 12 12.07
4 26 27.96
5 28 ∞
Various data Zoom ratio 2.24
Wide angle Medium telephoto focal length 3.79 6.09 8.49
F number 4.12 4.12 4.12
Half angle of view (degrees) 59.92 50.60 42.92
Image height 6.55 7.42 7.89
Total lens length 61.68 53.58 51.51
BF 3.42 3.36 3.31

d10 14.13 4.55 1.00
d11 3.63 2.12 0.50
d25 2.16 5.21 8.36
d27 1.76 1.70 1.65

Lens group data group Start surface Focal length
1 1 -10.53
2 11 ∞
3 12 12.07
4 26 27.96
5 28 ∞

［数値データ４］
単位 mm

面データ
面番号 r d nd νd
1 26.062 1.45 1.69680 55.5
2 12.997 4.95
3 24.278 0.80 1.76802 49.2
4* 7.209 4.72
5 68.257 0.80 1.59201 67.0
6* 9.744 1.30
7 11.383 3.40 1.85478 24.8
8 20.862 (可変)
9(補助絞り）∞ (可変)
10(開口絞り) ∞ 1.87
11 11.964 2.20 1.67270 32.1
12 -11.846 0.80
13 -9.858 0.45 1.91082 35.3
14 18.116 0.80
15(補助絞り）∞ 0.00
16* 8.286 3.60 1.49710 81.6
17* -13.384 0.50
18 25.573 0.50 1.88300 40.8
19 6.958 5.50 1.49700 81.5
20 -10.920 (可変)
21* 14.779 0.70 1.85135 40.1
22* 9.245 (可変)
23* 17.185 4.50 1.53110 55.9
24* 4297.262 (可変)
25 ∞ 1.00 1.51633 64.1
26 ∞ 1.00
像面 ∞
[Numeric data 4]
Unit mm

Surface data surface number rd nd νd
1 26.062 1.45 1.69680 55.5
2 12.997 4.95
3 24.278 0.80 1.76802 49.2
4 * 7.209 4.72
5 68.257 0.80 1.59201 67.0
6 * 9.744 1.30
7 11.383 3.40 1.85478 24.8
8 20.862 (variable)
9 (auxiliary aperture) ∞ (variable)
10 (Aperture stop) ∞ 1.87
11 11.964 2.20 1.67270 32.1
12 -11.846 0.80
13 -9.858 0.45 1.91082 35.3
14 18.116 0.80
15 (auxiliary aperture) ∞ 0.00
16 * 8.286 3.60 1.49710 81.6
17 * -13.384 0.50
18 25.573 0.50 1.88300 40.8
19 6.958 5.50 1.49700 81.5
20 -10.920 (variable)
21 * 14.779 0.70 1.85135 40.1
22 * 9.245 (variable)
23 * 17.185 4.50 1.53110 55.9
24 * 4297.262 (variable)
25 ∞ 1.00 1.51633 64.1
26 ∞ 1.00
Image plane ∞

非球面データ
第4面
K =-2.44642e+000 A 4= 2.04448e-004 A 6=-1.98507e-006 A 8= 2.13161e-008 A10=-3.49872e-011

第6面
K = 0.00000e+000 A 4= 2.61751e-004 A 6=-2.66723e-006 A 8=-1.08423e-008

第16面
K = 0.00000e+000 A 4=-3.87689e-004 A 6= 3.77415e-006 A 8=-1.38081e-007

第17面
K = 0.00000e+000 A 4= 1.52861e-004 A 6= 4.16820e-006 A 8=-1.27288e-007

第21面
K = 0.00000e+000 A 4=-5.15560e-004 A 6=-6.60428e-007

第22面
K = 0.00000e+000 A 4=-4.78918e-004 A 6=-2.31904e-006 A 8= 3.78466e-008

第23面
K = 0.00000e+000 A 4=-1.24918e-005 A 6=-6.43777e-008

第24面
K = 0.00000e+000 A 4= 7.21741e-005 A 6=-2.86180e-006 A 8= 1.31578e-008
Aspheric data 4th surface
K = -2.44642e + 000 A 4 = 2.04448e-004 A 6 = -1.98507e-006 A 8 = 2.13161e-008 A10 = -3.49872e-011

6th page
K = 0.00000e + 000 A 4 = 2.61751e-004 A 6 = -2.66723e-006 A 8 = -1.08423e-008

16th page
K = 0.00000e + 000 A 4 = -3.87689e-004 A 6 = 3.77415e-006 A 8 = -1.38081e-007

17th page
K = 0.00000e + 000 A 4 = 1.52861e-004 A 6 = 4.16820e-006 A 8 = -1.27288e-007

21st page
K = 0.00000e + 000 A 4 = -5.15560e-004 A 6 = -6.60428e-007

22nd page
K = 0.00000e + 000 A 4 = -4.78918e-004 A 6 = -2.31904e-006 A 8 = 3.78466e-008

23rd page
K = 0.00000e + 000 A 4 = -1.24918e-005 A 6 = -6.43777e-008

24th page
K = 0.00000e + 000 A 4 = 7.21741e-005 A 6 = -2.86180e-006 A 8 = 1.31578e-008

各種データ
ズーム比 2.26
広角 中間 望遠
焦点距離 3.77 6.09 8.52
Fナンバー 4.12 4.12 4.12
半画角（度） 60.08 50.89 42.81
像高 6.55 7.50 7.89
レンズ全長 66.86 65.86 66.39
BF 7.22 5.24 3.86

d 8 14.06 7.02 1.50
d 9 3.41 2.92 4.20
d20 0.70 1.54 3.00
d22 2.63 10.31 14.99
d24 5.56 3.58 2.20

レンズ群データ
群 始面 焦点距離
1 1 -7.50
2 9 ∞
3 10 13.13
4 21 -30.80
5 23 32.48
6 25 ∞
Various data Zoom ratio 2.26
Wide angle Medium telephoto focal length 3.77 6.09 8.52
F number 4.12 4.12 4.12
Half angle of view (degrees) 60.08 50.89 42.81
Image height 6.55 7.50 7.89
Total lens length 66.86 65.86 66.39
BF 7.22 5.24 3.86

d 8 14.06 7.02 1.50
d 9 3.41 2.92 4.20
d20 0.70 1.54 3.00
d22 2.63 10.31 14.99
d24 5.56 3.58 2.20

Lens group data group Start surface Focal length
1 1 -7.50
2 9 ∞
3 10 13.13
4 21 -30.80
5 23 32.48
6 25 ∞

［数値データ５］
単位 mm

面データ
面番号 r d nd νd
1 27.314 1.45 1.69680 55.5
2 14.883 4.50
3 24.805 0.80 1.76802 49.2
4* 6.894 5.26
5 29.623 0.80 1.59201 67.0
6* 9.316 2.86
7 10.974 3.40 1.85478 24.8
8 17.191 (可変)
9(補助絞り）∞ (可変)
10(開口絞り) ∞ 1.87
11 9.606 2.20 1.67270 32.1
12 -11.702 0.80
13 -8.001 0.45 1.91082 35.3
14 12.323 0.80
15(補助絞り）∞ 0.00
16* 10.261 3.60 1.49710 81.6
17* -8.786 0.50
18 15.327 0.50 1.88300 40.8
19 7.057 5.50 1.49700 81.5
20 -12.123 0.10
21* -19.935 0.70 1.85135 40.1
22* -199.518 (可変)
23* 19.544 4.50 1.53110 55.9
24* -89.690 (可変)
25 ∞ 1.00 1.51633 64.1
26 ∞ 1.00
像面 ∞
[Numeric data 5]
Unit mm

Surface data surface number rd nd νd
1 27.314 1.45 1.69680 55.5
2 14.883 4.50
3 24.805 0.80 1.76802 49.2
4 * 6.894 5.26
5 29.623 0.80 1.59201 67.0
6 * 9.316 2.86
7 10.974 3.40 1.85478 24.8
8 17.191 (variable)
9 (auxiliary aperture) ∞ (variable)
10 (Aperture stop) ∞ 1.87
11 9.606 2.20 1.67270 32.1
12 -11.702 0.80
13 -8.001 0.45 1.91082 35.3
14 12.323 0.80
15 (auxiliary aperture) ∞ 0.00
16 * 10.261 3.60 1.49710 81.6
17 * -8.786 0.50
18 15.327 0.50 1.88 300 40.8
19 7.057 5.50 1.49700 81.5
20 -12.123 0.10
21 * -19.935 0.70 1.85 135 40.1
22 * -199.518 (variable)
23 * 19.544 4.50 1.53110 55.9
24 * -89.690 (variable)
25 ∞ 1.00 1.51633 64.1
26 ∞ 1.00
Image plane ∞

非球面データ
第4面
K =-2.44642e+000 A 4= 3.65500e-004 A 6=-3.13592e-006 A 8= 4.48417e-008 A10=-2.18770e-010

第6面
K = 0.00000e+000 A 4= 1.65803e-004 A 6=-3.63705e-006 A 8= 2.12057e-008

第16面
K = 0.00000e+000 A 4=-4.78745e-004 A 6= 1.83877e-006 A 8=-5.14669e-008

第17面
K = 0.00000e+000 A 4=-2.73985e-004 A 6= 7.17016e-007 A 8=-1.28223e-007

第21面
K = 0.00000e+000 A 4= 1.71703e-004 A 6=-3.87914e-006

第22面
K = 0.00000e+000 A 4= 3.50686e-004 A 6=-4.35775e-006 A 8= 1.64219e-008

第23面
K = 0.00000e+000 A 4= 1.22922e-004 A 6=-1.96727e-006

第24面
K = 0.00000e+000 A 4= 4.38827e-004 A 6=-7.56044e-006 A 8= 2.81030e-008
Aspheric data 4th surface
K = -2.44642e + 000 A 4 = 3.65500e-004 A 6 = -3.13592e-006 A 8 = 4.48417e-008 A10 = -2.18770e-010

6th page
K = 0.00000e + 000 A 4 = 1.65803e-004 A 6 = -3.63705e-006 A 8 = 2.12057e-008

16th page
K = 0.00000e + 000 A 4 = -4.78745e-004 A 6 = 1.83877e-006 A 8 = -5.14669e-008

17th page
K = 0.00000e + 000 A 4 = -2.73985e-004 A 6 = 7.17016e-007 A 8 = -1.28223e-007

21st page
K = 0.00000e + 000 A 4 = 1.71703e-004 A 6 = -3.87914e-006

22nd page
K = 0.00000e + 000 A 4 = 3.50686e-004 A 6 = -4.35775e-006 A 8 = 1.64219e-008

23rd page
K = 0.00000e + 000 A 4 = 1.22922e-004 A 6 = -1.96727e-006

24th page
K = 0.00000e + 000 A 4 = 4.38827e-004 A 6 = -7.56044e-006 A 8 = 2.81030e-008

各種データ
ズーム比 2.26
広角 中間 望遠
焦点距離 3.77 6.48 8.52
Fナンバー 4.12 4.12 4.12
半画角（度） 60.08 49.14 42.81
像高 6.55 7.50 7.89
レンズ全長 69.78 67.07 69.28
BF 6.96 6.61 6.16

d 8 13.69 5.14 1.50
d 9 4.03 2.23 2.53
d22 4.51 12.51 18.51
d24 5.30 4.95 4.50

レンズ群データ
群 始面 焦点距離
1 1 -8.44
2 9 ∞
3 10 16.32
4 23 30.65
5 25 ∞

Various data Zoom ratio 2.26
Wide angle Medium Telephoto focal length 3.77 6.48 8.52
F number 4.12 4.12 4.12
Half angle of view (degrees) 60.08 49.14 42.81
Image height 6.55 7.50 7.89
Total lens length 69.78 67.07 69.28
BF 6.96 6.61 6.16

d 8 13.69 5.14 1.50
d 9 4.03 2.23 2.53
d22 4.51 12.51 18.51
d24 5.30 4.95 4.50

Lens group data group Start surface Focal length
1 1 -8.44
2 9 ∞
3 10 16.32
4 23 30.65
5 25 ∞

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 ＳＰ 開口絞り
ＦＰ１ 前側補助絞り（移動） ＦＰ２ 後側補助絞り L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group SP Aperture stop FP1 Front side auxiliary stop (movement) FP2 Back side auxiliary stop

Claims (12)

物体側より像側へ順に配置された、負の屈折力の第１レンズ群、正の屈折率の第２レンズ群、１つ以上のレンズ群を有する後群より構成され、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において、
前記第１レンズ群は物体側から像側へ順に配置されたメニスカス形状の負レンズＧ１、メニスカス形状の負レンズＧ２を有し、
前記負レンズＧ１の像側のレンズ面の曲率半径をＧ１Ｒ２、前記負レンズＧ２の像側のレンズ面の曲率半径をＧ２Ｒ２、前記第１レンズ群の厚みＤ１、広角端におけるバックフォーカスをｂｆｗ、広角端における全系の焦点距離をｆｗとするとき、
１．５＜Ｇ１Ｒ２／Ｇ２Ｒ２＜４．０
４．０＜Ｄ１／ｆｗ＜１０．０
０．５０＜ｂｆｗ／ｆｗ＜１．９５
なる条件式を満足することを特徴とするズームレンズ。 A first lens group having a negative refractive power, a second lens group having a positive refractive index, and a rear group having one or more lens groups, which are arranged in order from the object side to the image side, and are adjacent to each other during zooming In zoom lenses where the distance between groups changes,
The first lens group includes a meniscus negative lens G1 and a meniscus negative lens G2 arranged in order from the object side to the image side.
The radius of curvature of the image side lens surface of the negative lens G1 is G1R2, the radius of curvature of the image side lens surface of the negative lens G2 is G2R2, the thickness D1 of the first lens group, the back focus at the wide angle end is bfw, and the wide angle. When the focal length of the entire system at the end is fw,
1.5 <G1R2 / G2R2 <4.0
4.0 <D1 / fw <10.0
0.50 <bfw / fw <1.95
A zoom lens satisfying the following conditional expression: 前記第１レンズ群の焦点距離をｆ１、前記第２レンズ群の焦点距離をｆ２とするとき、
０．５＜｜ｆ１／ｆ２｜＜２．０
なる条件式を満足することを特徴とする請求項１に記載のズームレンズ。 When the focal length of the first lens group is f1, and the focal length of the second lens group is f2,
0.5 <| f1 / f2 | <2.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. 前記第１レンズ群は、前記負レンズＧ２の像側に隣接して配置された負レンズＧ３を有し、
前記負レンズＧ３の像側のレンズ面の曲率半径をＧ３Ｒ２とするとき、
０．６＜Ｇ２Ｒ２／Ｇ３Ｒ２＜２．０
なる条件式を満足することを特徴とする請求項１または２に記載のズームレンズ The first lens group includes a negative lens G3 disposed adjacent to the image side of the negative lens G2,
When the radius of curvature of the image side lens surface of the negative lens G3 is G3R2,
0.6 <G2R2 / G3R2 <2.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied: 前記負レンズＧ２の物体側のレンズ面の曲率半径をＧ２Ｒ１とするとき、
１．２＜（Ｇ２Ｒ１＋Ｇ１Ｒ２）／（Ｇ２Ｒ１―Ｇ１Ｒ２）＜１０．０
なる条件式を満足することを特徴とする請求項１乃至３のいずれか１項に記載のズームレンズ。 When the radius of curvature of the object-side lens surface of the negative lens G2 is G2R1,
1.2 <(G2R1 + G1R2) / (G2R1-G1R2) <10.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. 前記第１レンズ群は、前記負レンズＧ２の像側に隣接して配置された負レンズＧ３を有し、
前記負レンズＧ３の材料の屈折率をＮｄ１３、前記負レンズＧ３の材料のアッベ数をνｄ１３とするとき、
１．５５＜Ｎｄ１３＜１．６５
６５＜νｄ１３＜７５
なる条件式を満足する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 first lens group includes a negative lens G3 disposed adjacent to the image side of the negative lens G2,
When the refractive index of the material of the negative lens G3 is Nd13 and the Abbe number of the material of the negative lens G3 is νd13,
1.55 <Nd13 <1.65
65 <νd13 <75
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. ズーミングに際して前記第１レンズ群は移動し、
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とし、移動量の符号を広角端に比べて望遠端において物体側に位置するときを正、像側に位置するときを負とするとき、
−３．０＜Ｍ１／ｆｗ＜１．０
なる条件式を満足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 first lens group moves during zooming,
The amount of movement of the first lens group during zooming from the wide-angle end to the telephoto end is M1, and the sign of the amount of movement is positive when it is located on the object side at the telephoto end compared to the wide-angle end, and when it is located on the image side. When negative
−3.0 <M1 / fw <1.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. 前記第１レンズ群は、物体側から像側へ順に配置された３枚以上の負レンズと１枚の正レンズを有する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。   The zoom according to any one of claims 1 to 6, wherein the first lens group includes three or more negative lenses and one positive lens arranged in order from the object side to the image side. lens. 前記第２レンズ群は、負レンズと正レンズを接合した接合レンズを有する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。   The zoom lens according to any one of claims 1 to 7, wherein the second lens group includes a cemented lens in which a negative lens and a positive lens are cemented. 前記後群は、正の屈折力の第３レンズ群より構成される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。   The zoom lens according to claim 1, wherein the rear group includes a third lens group having a positive refractive power. 前記後群は、物体側から像側へ順に配置された、負の屈折力の第３レンズ群、正の屈折力の第４レンズ群より構成される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。   9. The rear group includes a third lens group having a negative refractive power and a fourth lens group having a positive refractive power, which are arranged in order from the object side to the image side. The zoom lens according to any one of the above. 請求項１乃至１０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。   An image pickup apparatus comprising: the zoom lens according to claim 1; and an image pickup element that receives an image formed by the zoom lens. 広角端における有効像円径が望遠端における有効像円径よりも小さいことを特徴とする請求項１１に記載の撮像装置。   The imaging apparatus according to claim 11, wherein an effective image circle diameter at the wide-angle end is smaller than an effective image circle diameter at the telephoto end.
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN112285882A (en) * 2020-10-09 2021-01-29 浙江大华技术股份有限公司 Optical imaging lens and monitor

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