JP6366323B2 - Zoom lens and imaging device - Google Patents
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Description
本発明は、デジタルスチルカメラ、ビデオカメラ、ＴＶカメラ、監視用カメラ等の撮像装置の撮像光学系として好適なズームレンズに関する。 The present invention relates to a zoom lens suitable as an imaging optical system of an imaging apparatus such as a digital still camera, a video camera, a TV camera, or a surveillance camera.
撮像装置に用いられるズームレンズは、高ズーム比であること、全ズーム範囲で高い光学性能を有すること、小型軽量であること、像ぶれ補正機能を有すること等が要求されている。 A zoom lens used in an imaging apparatus is required to have a high zoom ratio, high optical performance in the entire zoom range, small size and light weight, and an image blur correction function.
特許文献１は、物体側より像側へ順に、正，負，正，正，負の屈折力の第１乃至第５レンズ群より成るズームレンズを開示している。特許文献２乃至４は、物体側から像側へ順に、正，負，正，負，正，負の屈折力の第１レンズ群乃至第６レンズ群よりなるズームレンズを開示している。特許文献２のズームレンズにおいては、像ぶれ補正に際して第２レンズ群全体が光軸に対して垂直方向に移動する。特許文献３のズームレンズにおいては、第２レンズ群が３つの部分群によって構成され、像ぶれ補正に際して中央の部分群が光軸に対して垂直方向に移動する。特許文献４のズームレンズにおいては、第２レンズ群が１枚の負レンズよりなる前群と負の屈折力の後群によって構成され、像ぶれ補正に際して後群が光軸に対して垂直方向に移動する。 Patent Document 1 discloses a zoom lens including first to fifth lens units having positive, negative, positive, positive, and negative refractive powers in order from the object side to the image side. Patent Documents 2 to 4 disclose a zoom lens including first to sixth lens groups having positive, negative, positive, negative, positive, and negative refractive powers in order from the object side to the image side. In the zoom lens of Patent Document 2, the entire second lens unit moves in a direction perpendicular to the optical axis during image blur correction. In the zoom lens disclosed in Patent Document 3, the second lens group includes three partial groups, and the central partial group moves in a direction perpendicular to the optical axis during image blur correction. In the zoom lens disclosed in Patent Document 4, the second lens group includes a front group including one negative lens and a rear group having a negative refractive power, and the rear group is perpendicular to the optical axis during image blur correction. Moving.
像ぶれ補正用のレンズ群をシフトさせるには、相応のシフト機構と電力が必要となるため、一般には像ぶれ補正用のレンズ群のレンズ構成は３枚程度が限界となってくる。特許文献２においては、第２レンズ群によって主な変倍効果を得ているため、ズーミングに伴う収差変動を少なくするためには、３枚構成では高性能化の面で限界が有る。 In order to shift the lens group for image blur correction, a corresponding shift mechanism and electric power are required. Therefore, in general, the lens configuration of the lens group for image blur correction is limited to about three. In Patent Document 2, since the main zooming effect is obtained by the second lens group, the three-lens configuration has a limit in terms of high performance in order to reduce aberration fluctuations accompanying zooming.
特許文献３のズームレンズは、第２レンズ群を３つの部分レンズ群に分け、中央の負の屈折力の部分群で像ぶれ補正を行っている。部分群で像ぶれ補正を行う場合、駆動レンズ群と非駆動レンズ群との間隔を相応に空ける必要があり、駆動レンズ群の前と後の両方に非駆動レンズ群がある特許文献３の構成では、第２レンズ群が大型化する傾向がある。 In the zoom lens of Patent Document 3, the second lens group is divided into three partial lens groups, and image blur correction is performed with a central group having a negative refractive power. When image blur correction is performed in the subgroup, the distance between the driving lens group and the non-driving lens group needs to be correspondingly increased, and the configuration of Patent Document 3 includes the non-driving lens group both before and after the driving lens group. Then, the second lens group tends to increase in size.
特許文献４のズームレンズは、第２レンズ群の前群が１枚の負レンズにより構成されており、収差補償されないため、後群もそれを打ち消すように収差を持つことになり、像ぶれ補正時の光学性能を良好に維持するのが難しい。 In the zoom lens of Patent Document 4, since the front group of the second lens group is composed of one negative lens and aberration compensation is not performed, the rear group also has aberration so as to cancel it, and image blur correction is performed. It is difficult to maintain good optical performance at the time.
本発明は、高ズーム比でありながら、像ぶれ補正時にも高い光学性能が得られるズームレンズを提供することを目的としている。 An object of the present invention is to provide a zoom lens that has a high zoom ratio and can provide high optical performance even when image blur correction is performed.
本発明のズームレンズは、物体側から像側へ順に配置された、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、正の屈折力の第３レンズ群、１以上のレンズ群を含む後群より構成され、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２レンズ群は、像ぶれ補正に際して不動の第２ａ群と、像ぶれ補正に際して、光軸に対して垂直方向の成分を含むように移動する第２ｂ群より構成されており、
前記第２ａ群は正レンズＧ２ａｐと負レンズＧ２ａｎより構成され、
前記第２ｂ群は正レンズと２枚以上の負レンズを有し、
前記第２ａ群の焦点距離をｆ２ａ、前記第２レンズ群の焦点距離をｆ２、前記正レンズＧ２ａｐの材料のアッベ数をνｄ２ａｐとするとき、
２．４＜｜ｆ２ａ／ｆ２｜
２８＜νｄ２ａｐ＜５０
なる条件式を満足することを特徴としている。
この他、本発明のズームレンズは、物体側から像側へ順に配置された、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、正の屈折力の第３レンズ群、１以上のレンズ群を含む後群より構成され、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２レンズ群は、像ぶれ補正に際して不動の第２ａ群と、像ぶれ補正に際して、光軸に対して垂直方向の成分を含むように移動する第２ｂ群より構成されており、
前記第２ａ群は正レンズＧ２ａｐと負レンズＧ２ａｎより構成され、
前記第２ｂ群は、物体側から像側へ順に配置された、負レンズ、負レンズ、正レンズより構成され、
前記第２ａ群の焦点距離をｆ２ａ、前記第２レンズ群の焦点距離をｆ２とするとき、
２．４＜｜ｆ２ａ／ｆ２｜
なる条件式を満足することを特徴としている。
The zoom lens according to the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and one or more lenses arranged in order from the object side to the image side. In a zoom lens that includes a rear group including the lens group, and in which the distance between adjacent lens groups changes during zooming,
The second lens group includes a second a group that does not move during image blur correction, and a second b group that moves so as to include a component in a direction perpendicular to the optical axis during image blur correction.
The second group a includes a positive lens G2ap and a negative lens G2an.
The second group b has a positive lens and two or more negative lenses,
When the focal length of the second group a is f2a, the focal length of the second lens group is f2 , and the Abbe number of the material of the positive lens G2ap is νd2ap ,
2.4 <| f2a / f2 |
28 <νd2ap <50
It satisfies the following conditional expression.
In addition, 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 a third lens group having a positive refractive power, which are arranged in order from the object side to the image side. In a zoom lens composed of a rear group including one or more lens groups, in which the interval between adjacent lens groups changes during zooming,
The second lens group includes a second a group that does not move during image blur correction, and a second b group that moves so as to include a component in a direction perpendicular to the optical axis during image blur correction.
The second group a includes a positive lens G2ap and a negative lens G2an.
The second group b includes a negative lens, a negative lens, and a positive lens arranged in order from the object side to the image side.
When the focal length of the second group a is f2a and the focal length of the second lens group is f2,
2.4 <| f2a / f2 |
It satisfies the following conditional expression.
本発明によれば、高ズーム比でありながら、像ぶれ補正時にも高い光学性能が得られるズームレンズを提供することができる。 According to the present invention, it is possible to provide a zoom lens that has a high zoom ratio and can obtain high optical performance even 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、物体側から像側へ順に配置された、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、正の屈折力の第３レンズ群、１以上のレンズ群を含む後群より構成され、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。そして第２レンズ群は像ぶれ補正に際して不動の第２ａ群と、像ぶれ補正に際して、光軸に対して垂直方向の成分を含むように移動する第２ｂ群より構成されている。
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The zoom lens according to the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and one or more lenses arranged in order from the object side to the image side. The distance between adjacent lens groups changes during zooming. The second lens group includes a second a group that does not move during image blur correction, and a second b group that moves so as to include a component perpendicular to the optical axis during image blur correction.
図１は、本発明の実施例１の広角端におけるレンズ断面図である。図２（Ａ），（Ｂ）は本発明の実施例１の無限遠にフォーカスしているときの広角端と望遠端における縦収差図である。図３（Ａ），（Ｂ）は、本発明の実施例１の無限遠にフォーカスしているときの広角端における像ぶれ補正なしと０．５度の像ぶれ補正したときの横収差図である。図４（Ａ），（Ｂ）は、本発明の実施例１の無限遠にフォーカスしているときの望遠端における像ぶれ補正なしと０．５度の像ぶれ補正したときの横収差図である。 FIG. 1 is a lens cross-sectional view at the wide angle end according to Embodiment 1 of the present invention. 2A and 2B are longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to the first embodiment of the present invention. FIGS. 3A and 3B are lateral aberration diagrams when no image blur correction is performed at the wide-angle end and 0.5 degree image blur correction is performed when focusing on infinity according to the first embodiment of the present invention. is there. FIGS. 4A and 4B are lateral aberration diagrams when no image blur correction is performed at the telephoto end and 0.5 degree image blur correction is performed when focusing on infinity according to the first embodiment of the present invention. is there.
図５は、本発明の実施例２の広角端におけるレンズ断面図である。図６（Ａ），（Ｂ）は本発明の実施例２の無限遠にフォーカスしているときの広角端と望遠端における縦収差図である。図７（Ａ），（Ｂ）は、本発明の実施例２の無限遠にフォーカスしているときの広角端における像ぶれ補正なしと０．５度の像ぶれ補正したときの横収差図である。図８（Ａ），（Ｂ）は、本発明の実施例２の無限遠にフォーカスしているときの望遠端における像ぶれ補正なしと０．５度の像ぶれ補正したときの横収差図である。 FIG. 5 is a lens cross-sectional view at the wide angle end according to Embodiment 2 of the present invention. 6A and 6B are longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to the second embodiment of the present invention. FIGS. 7A and 7B are lateral aberration diagrams when no image blur correction is performed at the wide-angle end and 0.5 degree image blur correction is performed, when focusing on infinity according to the second embodiment of the present invention. is there. FIGS. 8A and 8B are lateral aberration diagrams when no image blur correction is performed at the telephoto end and 0.5 degree image blur correction is performed when focusing on infinity according to the second embodiment of the present invention. is there.
図９は、本発明の実施例３の広角端におけるレンズ断面図である。図１０（Ａ），（Ｂ）は本発明の実施例３の無限遠にフォーカスしているときの広角端と望遠端における縦収差図である。図１１（Ａ），（Ｂ）は、本発明の実施例３の無限遠にフォーカスしているときの広角端における像ぶれ補正なしと０．５度の像ぶれ補正したときの横収差図である。図１２（Ａ），（Ｂ）は、本発明の実施例３の無限遠にフォーカスしているときの望遠端における像ぶれ補正なしと０．５度の像ぶれ補正したときの横収差図である。 FIG. 9 is a lens cross-sectional view at the wide-angle end according to Embodiment 3 of the present invention. FIGS. 10A and 10B are longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to Example 3 of the present invention. FIGS. 11A and 11B are lateral aberration diagrams when no image blur correction is performed at the wide-angle end and 0.5 degree image blur correction is performed when focusing on infinity according to the third embodiment of the present invention. is there. FIGS. 12A and 12B are lateral aberration diagrams when no image blur correction is performed at the telephoto end and 0.5 degree image blur correction is performed when focusing on infinity according to Embodiment 3 of the present invention. is there.
図１３は本発明のズームレンズを備えるカメラ（撮像装置）の要部概略図である。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そして銀塩フィルムカメラ等の撮像装置に用いられる撮影レンズ系である。 FIG. 13 is a schematic diagram of a main part of a camera (imaging device) including the zoom lens of the present invention. The zoom lens of each embodiment is a photographic lens system used in an imaging apparatus such as a video camera, a digital camera, or a silver salt film camera.
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。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、ＬＲは１以上のレンズ群を有する後群である。Ｌ２ａは部分群、Ｌ２ｂは部分群である。 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). 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 LR is a rear group having one or more lens groups. L2a is a subgroup and L2b is a subgroup.
実施例１と実施例３のレンズ断面図において、Ｌ４は負の屈折力の第４レンズ群、Ｌ５は正の屈折力の第５レンズ群、Ｌ６は負の屈折力の第６レンズ群である。実施例２のレンズ断面図において、Ｌ４は正の屈折力の第４レンズ群、Ｌ５は負の屈折力の第５レンズ群である。ＳＰは開口絞りである。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）の撮像面に、銀塩フィルム用カメラのときはフィルム面に相当する感光面が置かれる。 In the lens cross-sectional views of Example 1 and Example 3, L4 is a fourth lens group having a negative refractive power, L5 is a fifth lens group having a positive refractive power, and L6 is a sixth lens group having a negative refractive power. . In the lens cross-sectional view of Example 2, L4 is a fourth lens group having a positive refractive power, and L5 is a fifth lens group having a negative refractive power. SP is an aperture stop. IP is an image plane, and when used as a photographing optical system for a video camera or a digital still camera, on the imaging surface of a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor, Is provided with a photosensitive surface corresponding to the film surface.
球面収差図において実線はｄ線（波長５８７．５６ｎｍ）、二点鎖線はｇ線（波長４３５．８ｎｍ）である。非点収差図において破線はメリディオナル像面、実線はサジタル像面である。歪曲収差はｄ線によって表している。倍率色収差はｇ線によって表している。 In the spherical aberration diagram, the solid line is the d-line (wavelength 587.56 nm), and the two-dot chain line is the g-line (wavelength 435.8 nm). In the astigmatism diagram, the broken line is the meridional image plane, and the solid line is the sagittal image plane. Distortion is represented by the d-line. Lateral chromatic aberration is represented by the g-line.
横収差図において実線はｄ線のサジタル方向（Ｓ）、破線はｄ線のメリディオナル方向（Ｍ）を示している。ωは半画角（撮影画角の半分の値）、ＦｎｏはＦナンバーである。 In the lateral aberration diagram, the solid line indicates the sagittal direction (S) of the d line, and the broken line indicates the meridional direction (M) of the d line. ω is a half angle of view (a value half the shooting angle of view), and Fno is an F number.
各実施例において矢印は、広角端から望遠端へのズーミングにおける各レンズ群の移動軌跡を示している。 In each embodiment, the arrow indicates the movement locus of each lens unit during zooming from the wide-angle end to the telephoto end.
実施例１と実施例３のズームレンズは、物体側より像側へ順に配置された、正の屈折力の第１レンズ群Ｌ１、負の屈折力の第２レンズ群Ｌ２、正の屈折力の第３レンズ群Ｌ３、負の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５、負の屈折力の第６レンズ群Ｌ６より構成される６群ズームレンズである。ズーミングに際して第２レンズ群Ｌ２と第５レンズ群Ｌ５は不動であり、第１レンズ群Ｌ１、第３レンズ群Ｌ３、第４レンズ群Ｌ４、及び第６レンズ群Ｌ６が移動する。
The zoom lenses according to the first and third embodiments are arranged in order from the object side to the image side. The first lens unit L1 has a positive refractive power, the second lens unit L2 has a negative refractive power, and has a positive refractive power. This is a six-unit zoom lens including a third lens unit L3, a fourth lens unit L4 having negative refractive power, a fifth lens unit L5 having positive refractive power, and a sixth lens unit L6 having negative refractive power. During zooming, the second lens unit L2 and the fifth lens unit L5 do not move, and the first lens unit L1, the third lens unit L3, the fourth lens unit L4, and the sixth lens unit L6 move.
実施例２のズームレンズは、物体側より像側へ順に配置された、正の屈折力の第１レンズ群Ｌ１、負の屈折力の第２レンズ群Ｌ２、正の屈折力の第３レンズ群Ｌ３、正の屈折力の第４レンズ群Ｌ４、負の屈折力の第５レンズ群Ｌ５より構成される５群ズームレンズである。ズーミングに際して第２レンズ群Ｌ２は不動で、第１レンズ群Ｌ１、第３レンズ群Ｌ３、第４レンズ群Ｌ４、及び第５レンズ群Ｌ５が移動する。第１レンズ群を２つの正の屈折力のレンズ群に分割し、物体側より像側へ順に、正，正，負の屈折力のレンズ群と続くレンズタイプでも良い。本発明のズームレンズを構成するレンズ群は、ズーミングに際して間隔が変化することを基準として分けられており、本発明のズームレンズにおけるレンズ群は複数のレンズによって構成される場合に限定されず、１枚のレンズによって構成されていても良い。
The zoom lens of Example 2 includes a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, and a third lens unit having a positive refractive power, which are arranged in order from the object side to the image side. This is a five-unit zoom lens configured by L3, a fourth lens unit L4 having a positive refractive power, and a fifth lens unit L5 having a negative refractive power. During zooming, the second lens unit L2 does not move, and the first lens unit L1, the third lens unit L3, the fourth lens unit L4, and the fifth lens unit L5 move. The first lens group may be divided into two lens groups having a positive refractive power, followed by a lens group having a positive refractive power, a positive refractive power, and a negative refractive power in order from the object side to the image side. The lens group constituting the zoom lens of the present invention is divided on the basis that the interval changes during zooming, and the lens group in the zoom lens of the present invention is not limited to a case where it is composed of a plurality of lenses. It may be composed of a single lens.
本発明のズームレンズは、例えば撮像装置、画像投影装置やその他の光学機器に適用可能である。 The zoom lens of the present invention can be applied to, for example, an imaging device, an image projection device, and other optical devices.
各実施例のズームレンズでは、第２レンズ群を、ある程度収差が補償された２つの部分群より構成し、その片方の部分群で像ぶれ補正を行っている。具体的には、望遠端において倍率色収差を良好に補正するべく、像ぶれ補正用の部分群（第２ｂ群Ｌ２ｂ）の物体側に、収差がある程度補償された部分群（第２ａ群Ｌ２ａ）を配置した。 In the zoom lens of each embodiment, the second lens group is composed of two partial groups in which aberrations are compensated to some extent, and image blur correction is performed in one of the partial groups. Specifically, in order to satisfactorily correct lateral chromatic aberration at the telephoto end, a partial group (second group a L2a) in which aberrations are compensated to some extent is provided on the object side of the partial group for image blur correction (second group b). Arranged.
第１レンズ群Ｌ１と第２レンズ群Ｌ２の主点間隔を広げ過ぎると、全系が大型化するため、第２ａ群Ｌ２ａは１つの正レンズと１つの負レンズの最小のレンズ構成とした。第２ａ群Ｌ２ａは正レンズと負レンズのペアのためパワーが緩く、像ぶれ補正性能が良好な第２レンズ群全体で防振を行うレンズタイプの利点を継承する。それと同時に、正レンズと負レンズの材料の分散差や二次分散差をつけることにより、望遠端において倍率色収差の補正を容易にしている。 If the distance between the principal points of the first lens unit L1 and the second lens unit L2 is excessively widened, the entire system becomes large. Therefore, the second a unit L2a has a minimum lens configuration of one positive lens and one negative lens. Since the second a group L2a is a pair of a positive lens and a negative lens, it has a low power and inherits the advantages of a lens type that performs image stabilization for the entire second lens group with good image blur correction performance. At the same time, the chromatic aberration of magnification is easily corrected at the telephoto end by providing a dispersion difference and a secondary dispersion difference between the materials of the positive lens and the negative lens.
各実施例において、第２ａ群Ｌ２ａは正レンズＧ２ａｐと、負レンズＧ２ａｎより構成され、第２ａ群Ｌ２ａの焦点距離をｆ２ａ、第２レンズ群Ｌ２の焦点距離をｆ２とする。このとき、
２．４＜｜ｆ２ａ／ｆ２｜ ・・・（１）
なる条件式を満足する。
In each embodiment, the second a group L2a includes a positive lens G2ap and a negative lens G2an. The focal length of the second a group L2a is f2a, and the focal length of the second lens group L2 is f2. At this time,
2.4 <| f2a / f2 | (1)
The following conditional expression is satisfied.
条件式（１）は、第２ａ群Ｌ２ａのパワーを緩くし、元の第２群全体防振タイプの利点である良好な像ぶれ補正性能を得るためのものである。第２ａ群Ｌ２ａが正の屈折力のとき、条件式（１）の下限値を超えて第２ａ群Ｌ２ａの正の屈折力が強くなると第２ｂ群Ｌ２ｂの負の屈折力が強くなり過ぎ、像ぶれ補正時の非点収差が大きく発生してくる。 Conditional expression (1) is for reducing the power of the second a-group L2a and obtaining good image blur correction performance, which is an advantage of the original second-group whole image stabilization type. When the second a group L2a has a positive refractive power, if the positive refractive power of the second a group L2a increases beyond the lower limit of the conditional expression (1), the negative refractive power of the second b group L2b becomes too strong, and the image Astigmatism during blur correction is greatly generated.
第２ａ群Ｌ２ａが負の屈折力のとき、条件式（１）の下限値を超えて第２ａ群Ｌ２ａの負の屈折力が強くなると（負の屈折力の絶対値が大きくなると）第２ｂ群Ｌ２ｂの負の屈折力が弱くなりすぎ、像ぶれ補正に必要なシフト量が大きくなり、全系が大型化してくる。条件式（１）は、より好ましくは下記条件式（１Ａ）を満たすと良い。 When the second a group L2a has a negative refractive power, when the negative refractive power of the second a group L2a is increased beyond the lower limit value of the conditional expression (1) (when the absolute value of the negative refractive power is increased), the second b group The negative refractive power of L2b becomes too weak, the amount of shift required for image blur correction becomes large, and the entire system becomes large. Conditional expression (1) more preferably satisfies the following conditional expression (1A).
２．７＜｜ｆ２ａ／ｆ２｜ ・・・（１Ａ）
次に、本発明を実施するために、より好ましい構成について説明する。本発明のズームレンズは、第２ｂ群Ｌ２ｂが、正レンズと２枚以上の負レンズを有するのが良い。強い負の屈折力のレンズ群を最小のレンズ枚数で構成するには、高屈折率高分散よりなる正レンズを１つ、中程度の屈折率で低分散材料となる負レンズを２つとするのが最も効率が良く色消しやペッツバール和の軽減を図ることができる。
2.7 <| f2a / f2 | (1A)
Next, in order to implement this invention, a more preferable structure is demonstrated. The zoom lens of the present invention, the 2b group L2b is good to have a positive lens and two or more negative lenses. To construct a lens group having a strong negative refractive power with a minimum number of lenses, one positive lens having a high refractive index and high dispersion and two negative lenses having a medium refractive index and a low dispersion material are used. However, it is most efficient and can reduce achromaticity and Petzval sum.
また、全体として３つのレンズ構成とすることで、バリエータ（変倍レンズ群）としての機能を持たせると共に、像ぶれ補正用の部分群とすることも容易になる。この時、物体側から像側へ順に配置された、負レンズ，負レンズ，正レンズの順に配置すると、第１レンズ群Ｌ１と第２レンズ群Ｌ２の主点間隔を狭められ、高ズーム比化に有利になる。
In addition, by using a three-lens configuration as a whole, it is possible to provide a function as a variator (magnification lens group) and to make it a partial group for image blur correction. At this time, if the negative lens, the negative lens, and the positive lens are arranged in this order from the object side to the image side, the distance between the principal points of the first lens unit L1 and the second lens unit L2 can be reduced and the zoom ratio can be increased. To be advantageous.
各実施例において好ましくは次の条件式のうち１以上を満足するのが良い。正レンズＧ２ａｐの材料のアッベ数をνｄ２ａｐとする。正レンズＧ２ａｐの材料の部分分散比をθｇＦ２ａｐとする。負レンズＧ２ａｎの材料のアッベ数をνｄ２ａｎ、負レンズＧ２ａｎの材料の部分分散比をθｇＦ２ａｎとする。そして、 Ｘ２ａｐ＝−０．６４３８＋θｇＦ２ａｐ＋０．００１６８２×νｄ２ａｐ
Ｘ２ａｎ＝−０．６４３８＋θｇＦ２ａｎ＋０．００１６８２×νｄ２ａｎ
とおく。
In each embodiment, it is preferable to satisfy one or more of the following conditional expressions. The Abbe number of the material of the positive lens G2ap is νd2ap. Let the partial dispersion ratio of the material of the positive lens G2ap be θgF2ap. The Abbe number of the material of the negative lens G2an is νd2an, and the partial dispersion ratio of the material of the negative lens G2an is θgF2an. Then, X2ap = - 0.6438 + θgF2ap + 0.001682 × νd2ap
X2an = - 0.6438 + θgF2an + 0.001682 × νd2an
far.
負レンズＧ２ａｎの材料の屈折率をＮｄ２ａｎ、正レンズＧ２ａｐの材料の屈折率をＮｄ２ａｐとする。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。ここでアッベ数（ｄ線に対するアッベ数）νｄとｇＦ線の部分分散比θｇＦは次のとおりである。ｇ線（波長435.8nm）、Ｆ線（486.1nm）、ｄ線（587.6nm）、Ｃ線（656.3nm）に対する材料の屈折率をそれぞれＮｇ，Ｎｄ，Ｎｆ，Ｎｃとする。このとき、
θｇＦ＝（Ｎｇ−Ｎｆ）／（Ｎｆ−Ｎｃ）
νｄ＝（Ｎｄ−１）／（Ｎｆ−Ｎｃ）
である。
The refractive index of the material of the negative lens G2an is Nd2an, and the refractive index of the material of the positive lens G2ap is Nd2ap. The focal length of the first lens unit L1 is f1, and the focal length of the second lens unit L2 is f2. Here, the Abbe number (Abbe number with respect to the d line) νd and the partial dispersion ratio θgF of the gF line are as follows. The refractive indices of the materials for g-line (wavelength 435.8 nm), F-line (486.1 nm), d-line (587.6 nm), and C-line (656.3 nm) are Ng, Nd, Nf, and Nc, respectively. At this time,
θgF = (Ng−Nf) / (Nf−Nc)
νd = (Nd−1) / (Nf−Nc)
It is.
このとき次の条件式のうち１以上を満足するのが良い。 At this time, one or more of the following conditional expressions should be satisfied.
２８＜νｄ２ａｐ＜５０ ・・・（２）
０．００１＜Ｘ２ａｐ−Ｘ２ａｎ＜０．０３０ ・・・（３）
１．０２＜Ｎｄ２ａｎ／Ｎｄ２ａｐ＜１．５０ ・・・（４）
２．０＜−ｆ１／ｆ２＜５．０ ・・・（５）
次に前述の各条件式の技術的意味について説明する。
28 <νd2ap <50 (2)
0.001 <X2ap-X2an <0.030 (3)
1.02 <Nd2an / Nd2ap <1.50 (4)
2.0 <−f1 / f2 <5.0 (5)
Next, the technical meaning of each conditional expression described above will be described.
条件式（２）は、第２ａ群Ｌ２ａで倍率色収差を良好に補正するためのものである。条件式（２）の上限値を逸脱すると、倍率色収差の補正効果が弱くなる。また下限値を逸脱すると、倍率色収差が過補正になるので良くない。条件式（２）は、より好ましくは条件式（２Ａ）を満たすとよい。 Conditional expression (2) is for satisfactorily correcting the lateral chromatic aberration in the second a-group L2a. When deviating from the upper limit value of conditional expression (2), the effect of correcting the lateral chromatic aberration is weakened. If the value deviates from the lower limit value, the lateral chromatic aberration is overcorrected, which is not good. Conditional expression (2) more preferably satisfies conditional expression (2A).
２８＜νｄ２ａｐ＜４５・・・（２Ａ）
次に、２ａ群の正レンズと負レンズの関係は、下記条件式（３）を満たすと良い。
28 <ν d 2ap <45 (2A)
Next, the relationship between the positive lens and the negative lens in the group 2a preferably satisfies the following conditional expression (3).
条件式（３）は、条件式（２）と同様に第２ａ群Ｌ２ａで倍率色収差を良好に補正するためのものである。条件式（３）の上限値を逸脱すると、倍率色収差の補正効果が過補正になり、第２ｂ群Ｌ２ｂとの収差補正のバランスが崩れてくる。また下限値を逸脱すると、倍率色収差の補正効果が少なくなる。条件式（３）は、より好ましくは条件式（３Ａ）を満たすとよい。 Conditional expression (3) is used to satisfactorily correct lateral chromatic aberration in the second a group L2a as in conditional expression (2). If the upper limit value of conditional expression (3) is deviated, the correction effect of lateral chromatic aberration is overcorrected, and the balance of aberration correction with the second b group L2b is lost. If the value deviates from the lower limit value, the effect of correcting the lateral chromatic aberration decreases. Conditional expression (3) more preferably satisfies conditional expression (3A).
０．００１５＜Ｘ２ａｐ−Ｘ２ａｎ＜０．０２００・・・（３Ａ）
条件式（４）は、第２レンズ群Ｌ２のペッツバール和を小さくし、像面湾曲に良好に補正するためのものである。
0.0015 <X2ap-X2an <0.0200 (3A)
Conditional expression (4) is for reducing the Petzval sum of the second lens unit L2 and favorably correcting the curvature of field.
第２ｂ群Ｌ２ｂを３つのレンズより構成したことで、ペッツバール和がある程度良好に補正されていることは前述した通りだが、第２ａ群Ｌ２ａが条件式（４）を満たすことで、更に第２レンズ群Ｌ２のペッツバール和をより小さくすることが容易となる。 As described above, the Petzval sum is corrected to some extent by configuring the second b group L2b from three lenses. However, if the second a group L2a satisfies the conditional expression (4), the second lens is further increased. It becomes easy to further reduce the Petzval sum of the group L2.
条件式（４）の下限値を逸脱すると、ペッツバール和が大きくなってしまう。また条件式（４）の上限値を逸脱すると、正レンズの肉厚が厚くなり過ぎ、第１レンズ群Ｌ１と第２レンズ群Ｌ２の主点間隔が離れるため、全系が大型化してくる。条件式（４）は、より好ましくは、下記条件式（４Ａ）を満たすと良い。 When deviating from the lower limit value of conditional expression (4), the Petzval sum increases. If the upper limit of conditional expression (4) is deviated, the thickness of the positive lens becomes too thick, and the distance between the principal points of the first lens unit L1 and the second lens unit L2 is increased. Conditional expression (4) more preferably satisfies the following conditional expression (4A).
１．０３＜Ｎｄ２ａｎ／Ｎｄ２ａｐ＜１．４０・・・（４Ａ）
条件式（５）は、第２レンズ群Ｌ２に対する第１レンズ群Ｌ１の焦点距離の比を適切に設定し、ズーミングに際して球面収差や像面湾曲の変動を小さくし、かつ全系の小型化を図るためのものである。
1.03 <Nd2an / Nd2ap <1.40 (4A)
Conditional expression (5) sets an appropriate ratio of the focal length of the first lens unit L1 to the second lens unit L2, reduces variations in spherical aberration and field curvature during zooming, and reduces the size of the entire system. It is for illustration.
条件式（５）の上限値を逸脱すると、全系が大型化してくる。条件式（５）の下限値を逸脱すると、第１レンズ群Ｌ１のパワーが強くなり過ぎ、ズーミングに際して球面収差や像面湾曲の変動を少なくするのが困難になる。条件式（５）は、より好ましくは条件式（５Ａ）を満たすと良い。 If the upper limit of conditional expression (5) is deviated, the entire system becomes larger. If the lower limit of conditional expression (5) is deviated, the power of the first lens unit L1 becomes too strong, and it becomes difficult to reduce variations in spherical aberration and field curvature during zooming. Conditional expression (5) more preferably satisfies conditional expression (5A).
２．５＜−ｆ１／ｆ２＜４．０・・・（５Ａ）
以下、各実施例におけるレンズ構成について説明する。
2.5 <−f1 / f2 <4.0 (5A)
Hereinafter, the lens configuration in each embodiment will be described.
実施例１は、物体側より像側へ順に、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、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、負の屈折力の第６レンズ群Ｌ６で構成されている。 In the first embodiment, in order from the object side to the image side, a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, and a negative refractive power. The fourth lens unit L4, the fifth lens unit L5 having a positive refractive power, and the sixth lens unit L6 having a negative refractive power.
広角端から望遠端へのズーミングに際し、第２レンズ群Ｌ２と第５レンズ群Ｌ５が不動で、第１レンズ群Ｌ１、第３レンズ群Ｌ３、第６レンズ群Ｌ６が物体側に移動し、第４レンズ群Ｌ４が像側に移動している。また、第６レンズ群Ｌ６を像側に移動することで、無限遠から近距離へのフォーカシングを行っている。第２レンズ群Ｌ２は、正の屈折力の部分系Ｌ２ａと負の屈折力の部分系Ｌ２ｂより構成されている。像振れ補正に際して部分系Ｌ２ｂは光軸に対して垂直方向の成分を持つように移動する。即ち部分系Ｌ２ｂで像ぶれ補正効果を得ている。 During zooming from the wide-angle end to the telephoto end, the second lens unit L2 and the fifth lens unit L5 do not move, the first lens unit L1, the third lens unit L3, and the sixth lens unit L6 move to the object side, The four lens unit L4 is moved to the image side. Further, focusing from infinity to a short distance is performed by moving the sixth lens unit L6 to the image side. The second lens unit L2 includes a partial system L2a having a positive refractive power and a partial system L2b having a negative refractive power. During image blur correction, the partial system L2b moves so as to have a component in a direction perpendicular to the optical axis. That is, the image blur correction effect is obtained in the partial system L2b.
また、第２レンズ群Ｌ２と部分系Ｌ２ａのパワー比（屈折力比）は、条件式（１）を満たしており、それにより良好な像ぶれ補正性能を得ている。部分系Ｌ２ｂは物体側から像側へ順に、負レンズ，負レンズ，正レンズの順に配置されている。部分系Ｌ２ｂの正レンズの材料を高屈折率高分散とし、２つの負レンズを中程度の屈折率で低分散とすることで、効率が良く色消しを行い、更にペッツバール和の軽減をし、像ぶれ補正系としても良好な光学性能を得ている。 Further, the power ratio (refractive power ratio) between the second lens unit L2 and the partial system L2a satisfies the conditional expression (1), thereby obtaining good image blur correction performance. The partial system L2b is arranged in order of the negative lens, the negative lens, and the positive lens from the object side to the image side. By making the material of the positive lens of the subsystem L2b high refractive index and high dispersion, and making the two negative lenses low dispersion with a medium refractive index, it is efficient and achromatic, and further reduces the Petzval sum, Good optical performance is obtained as an image blur correction system.
部分系Ｌ２ｂを構成する各レンズを、このように配置することで、第１レンズ群Ｌ１と第２レンズ群Ｌ２の主点間隔を狭めて高ズーム比化を容易にしている。また、部分系Ｌ２ａを構成する正レンズの材料は、条件式（２）を満たしている。部分系Ｌ２ａを構成する負レンズと正レンズの材料の関係は条件式（３）を満たしている。それにより、部分系Ｌ２ａで望遠端において倍率色収差を効果的に補正している。また、部分系Ｌ２ａを構成する負レンズと正レンズの材料関係は、条件式（４）を満たしており、それによりペッツバール和を小さくしている。 By disposing the lenses constituting the partial system L2b in this way, the distance between the principal points of the first lens unit L1 and the second lens unit L2 is narrowed to facilitate a high zoom ratio. Further, the material of the positive lens constituting the partial system L2a satisfies the conditional expression (2). The relationship between the materials of the negative lens and the positive lens constituting the partial system L2a satisfies the conditional expression (3). Thereby, the lateral chromatic aberration is effectively corrected at the telephoto end in the partial system L2a. Further, the material relationship between the negative lens and the positive lens constituting the partial system L2a satisfies the conditional expression (4), thereby reducing the Petzval sum.
また、第１レンズ群Ｌ１と第２レンズ群Ｌ２のパワー比が、条件式（５）を満たしており、これによりズーミングに際しての球面収差や像面湾曲の変動を小さくしつつ、全系の小型化を達成している。 Further, the power ratio between the first lens unit L1 and the second lens unit L2 satisfies the conditional expression (5), thereby reducing the variation of spherical aberration and field curvature during zooming, and reducing the size of the entire system. Has been achieved.
実施例２は、物体側より像側へ順に、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、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、負の屈折力の第５レンズ群Ｌ５で構成されている。広角端から望遠端へのズーミングに際し、第２レンズ群Ｌ２が不動で、第１レンズ群Ｌ１、第３レンズ群Ｌ３乃至第５レンズ群Ｌ５が物体側に移動している。第５レンズ群Ｌ５を像側に移動することで、無限遠から近距離へのフォーカシングを行っている。第２レンズ群Ｌ２は、正の屈折力の部分系Ｌ２ａと負の屈折力のＬ２ｂより構成されている。像ぶれ補正に際して部分系Ｌ２ｂは光軸に対して垂直方向の成分を持つ方向に移動して像ぶれ補正効果を得ている。 In Example 2, in order from the object side to the image side, a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, and a positive refractive power. The fourth lens unit L4 and the fifth lens unit L5 having a negative refractive power. During zooming from the wide-angle end to the telephoto end, the second lens unit L2 does not move, and the first lens unit L1, the third lens unit L3 to the fifth lens unit L5 move to the object side. By moving the fifth lens unit L5 to the image side, focusing from infinity to a short distance is performed. The second lens unit L2 includes a partial system L2a having a positive refractive power and an L2b having a negative refractive power. At the time of image blur correction, the sub-system L2b moves in a direction having a component perpendicular to the optical axis to obtain an image blur correction effect.
実施例２は部分系Ｌ２ａ，部分系Ｌ２ｂのレンズ構成に基づく条件式（１）乃至（４）を満足している。第１レンズ群Ｌ１と第２レンズ群Ｌ２のパワー比は条件式（５）を満足している。 Example 2 satisfies conditional expressions (1) to (4) based on the lens configurations of the partial systems L2a and L2b. The power ratio between the first lens unit L1 and the second lens unit L2 satisfies the conditional expression (5).
実施例３においてレンズ群の数、各レンズ群の屈折力、ズーミングに際しての各レンズ群の移動等のズームタイプは実施例１と同じである。フォーカシングに際して移動するレンズ群も実施例１と同じである。第２レンズ群Ｌ２のレンズ構成、像ぶれ補正に際して移動する部分系も実施例１と同じである。実施例３は部分系Ｌ２ａ，部分系Ｌ２ｂのレンズ構成に基づく条件式（１）乃至（４）を満足している。第１レンズ群Ｌ１，第２レンズ群Ｌ２のパワー比は条件式（５）を満足している。 In the third embodiment, the number of lens groups, the refractive power of each lens group, and the zoom type such as movement of each lens group during zooming are the same as those in the first embodiment. The lens group that moves during focusing is the same as in the first embodiment. The lens configuration of the second lens unit L2 and the partial system that moves during image blur correction are the same as those in the first embodiment. Example 3 satisfies conditional expressions (1) to (4) based on the lens configurations of the partial systems L2a and L2b. The power ratio between the first lens unit L1 and the second lens unit L2 satisfies the conditional expression (5).
図１３の撮像装置として用いた一眼レフカメラについて説明する。図１３において１０は実施例１乃至３のいずれか１つのズームレンズ１を有する撮影レンズである。ズームレンズ１は保持部材である鏡筒２に保持されている。２０はカメラ本体であり、撮影レンズ１０からの光束を上方に反射するクイックリターンミラー３、撮影レンズ１０の像形成装置に配置された焦点板４より構成されている。更に焦点板４に形成された逆像を正立像に変換するペンタダハプリズム５、その正立像を観察するための接眼レンズ６などによって構成されている。 A single-lens reflex camera used as the imaging apparatus of FIG. 13 will be described. In FIG. 13, reference numeral 10 denotes a photographing lens having the zoom lens 1 of any one of the first to third embodiments. The zoom lens 1 is held by a lens barrel 2 that is a holding member. Reference numeral 20 denotes a camera body, which includes a quick return mirror 3 that reflects the light beam from the photographing lens 10 upward, and a focusing screen 4 that is disposed in the image forming apparatus of the photographing lens 10. Further, it is constituted by a penta roof prism 5 for converting an inverted image formed on the focusing screen 4 into an erect image, an eyepiece 6 for observing the erect image, and the like.
７は感光面であり、ＣＣＤセンサやＣＭＯＳセンサ等のズームレンズによって形成される像を受光する固体撮像素子（光電変換素子）や銀塩フィルムが配置される。撮影時にはクイックリターンミラー３が光路から退避して、感光面７上に撮影レンズ１０によって像が形成される。実施例１乃至３にて説明した利益は本実施例に開示したような撮像装置において効果的に享受される。撮像装置としてクイックリターンミラー３のないミラーレスの一眼レフカメラにも同様に適用できる。 Reference numeral 7 denotes a photosensitive surface, on which a solid-state imaging device (photoelectric conversion device) or a silver salt film that receives an image formed by a zoom lens such as a CCD sensor or a CMOS sensor is arranged. At the time of photographing, the quick return mirror 3 is retracted from the optical path, and an image is formed on the photosensitive surface 7 by the photographing lens 10. The benefits described in the first to third embodiments are effectively enjoyed in the imaging apparatus disclosed in the present embodiment. The present invention can be similarly applied to a mirrorless single-lens reflex camera without the quick return mirror 3 as an imaging device.
以上、本発明の好ましいズームレンズの実施例について説明したが、本発明はこれらの実施例に限定されないことは言うまでもなく、その要旨の範囲内で種々の変形及び変更が可能である。 The preferred embodiments of the zoom lens according to the present invention have been described above. However, it goes without saying that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist of the present invention.
以下に実施例１乃至３に対応する数値実施例１乃至３を示す。各数値実施例においてｉは物体面からの面の順番を示す。数値実施例においてｒｉは物体側より順に第ｉ番目のレンズ面の曲率半径、ｄｉは物体側より順に第ｉ番目のレンズ厚及び空気間隔、ｎｄｉとνｄｉは各々物体側より順に第ｉ番目のレンズの材料の屈折率とアッベ数である。また光線有効径を示す。 Numerical examples 1 to 3 corresponding to the first to third examples are shown below. In each numerical example, i indicates the order of surfaces from the object surface. In numerical examples, ri is the radius of curvature of the i-th lens surface in order from the object side, di is the i-th lens thickness and air spacing in order from the object side, and ndi and νdi are the i-th lens in order from the object side. The refractive index and Abbe number of the material. The effective beam diameter is also shown.
また、焦点距離、Ｆナンバー等のスペックに加え、画角は全系の半画角（度）、像高は半画角を決定する最大像高、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、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長さを示している。
また、ズーム群データは、各レンズ群の焦点距離、光軸上の長さ、前側主点位置、後側主点位置を表している。
In addition to specifications such as focal length and F-number, the angle of view is the half angle of view (degrees) of the entire system, the image height is the maximum image height that determines the half angle of view, and the total lens length is from the first lens surface to the final lens surface BF is the back focus, and indicates the length from the final lens surface to the image plane.
The zoom group data represents the focal length of each lens group, the length on the optical axis, the front principal point position, and the rear principal point position.
また、各光学面の間隔ｄが（可変）となっている部分は、ズーミングに際して変化するものであり、別表に焦点距離に応じた面間隔を記している。尚、以下に記載する数値実施例１乃至３のレンズデータに基づく、各条件式の計算結果を表１に示す。 Further, the portion where the interval d between the optical surfaces is (variable) changes during zooming, and the surface interval corresponding to the focal length is shown in the separate table. Table 1 shows the calculation results of the conditional expressions based on the lens data of Numerical Examples 1 to 3 described below.
（数値実施例１）
単位 mm
面データ
面番号 r d nd νd 有効径
1 109.670 6.94 1.62299 58.2 69.44
2 495.105 0.15 68.74
3 147.450 2.70 1.65412 39.7 67.65
4 64.698 0.11 64.62
5 65.113 10.78 1.43875 94.9 64.62
6 1037.902 (可変) 63.83
7 111.494 4.03 1.59551 39.2 33.84
8 -147.429 1.70 1.77250 49.6 33.24
9 132.617 2.22 32.24
10 223.886 1.55 1.77250 49.6 31.72
11 63.492 4.14 31.05
12 -63.227 1.55 1.60311 60.6 31.04
13 80.909 3.00 1.84666 23.8 31.94
14 689.532 (可変) 32.10
15 132.772 5.44 1.43387 95.1 32.63
16 -62.875 0.18 32.81
17 87.368 5.37 1.51742 52.4 32.34
18 -66.028 1.60 1.90366 31.3 31.95
19 -375.161 (可変) 31.76
20(絞り) ∞ (可変) 28.41
21 -48.828 1.40 1.59270 35.3 27.04
22 48.828 3.87 1.78472 25.7 27.70
23 -249.921 (可変) 27.78
24 -192.509 2.72 1.76200 40.1 27.74
25 -53.844 0.16 27.82
26 57.166 5.64 1.48749 70.2 26.72
27 -44.894 1.40 1.84666 23.8 25.94
28 -452.162 0.15 25.41
29 52.725 2.93 1.72916 54.7 25.33
30 215.772 (可変) 25.03
31 55.796 1.20 1.88300 40.8 23.34
32 23.347 4.08 22.28
33 -65.479 2.53 1.80518 25.4 22.34
34 -32.044 1.33 22.74
35 -29.925 1.20 1.72916 54.7 22.63
36 99.181 4.30 23.80
37 51.642 4.11 1.65412 39.7 27.74
38 -235.796 28.05
(Numerical example 1)
Unit mm
Surface data surface number rd nd νd Effective diameter
1 109.670 6.94 1.62299 58.2 69.44
2 495.105 0.15 68.74
3 147.450 2.70 1.65412 39.7 67.65
4 64.698 0.11 64.62
5 65.113 10.78 1.43875 94.9 64.62
6 1037.902 (variable) 63.83
7 111.494 4.03 1.59551 39.2 33.84
8 -147.429 1.70 1.77250 49.6 33.24
9 132.617 2.22 32.24
10 223.886 1.55 1.77250 49.6 31.72
11 63.492 4.14 31.05
12 -63.227 1.55 1.60311 60.6 31.04
13 80.909 3.00 1.84666 23.8 31.94
14 689.532 (variable) 32.10
15 132.772 5.44 1.43387 95.1 32.63
16 -62.875 0.18 32.81
17 87.368 5.37 1.51742 52.4 32.34
18 -66.028 1.60 1.90366 31.3 31.95
19 -375.161 (variable) 31.76
20 (Aperture) ∞ (Variable) 28.41
21 -48.828 1.40 1.59270 35.3 27.04
22 48.828 3.87 1.78472 25.7 27.70
23 -249.921 (variable) 27.78
24 -192.509 2.72 1.76200 40.1 27.74
25 -53.844 0.16 27.82
26 57.166 5.64 1.48749 70.2 26.72
27 -44.894 1.40 1.84666 23.8 25.94
28 -452.162 0.15 25.41
29 52.725 2.93 1.72916 54.7 25.33
30 215.772 (variable) 25.03
31 55.796 1.20 1.88300 40.8 23.34
32 23.347 4.08 22.28
33 -65.479 2.53 1.80518 25.4 22.34
34 -32.044 1.33 22.74
35 -29.925 1.20 1.72916 54.7 22.63
36 99.181 4.30 23.80
37 51.642 4.11 1.65412 39.7 27.74
38 -235.796 28.05
各種データ
ズーム比 3.78
広角 中間 望遠
焦点距離 102.79 199.97 389.03
Fナンバー 4.63 4.94 5.85
半画角（度） 11.89 6.17 3.18
像高 21.64 21.64 21.64
レンズ全長 234.72 286.21 311.71
BF 67.26 70.32 75.88
d 6 1.50 53.00 78.50
d14 37.75 24.29 1.40
d19 1.61 11.57 26.37
d20 11.62 22.70 35.24
d23 16.52 8.94 4.50
d30 9.98 6.91 1.35
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 194.15 20.68 -2.16 -15.67
2 7 -55.24 18.19 9.44 -4.03
3 15 78.73 12.59 2.08 -6.25
4 20 ∞ 0.00 0.00 -0.00
5 21 -202.64 5.27 -2.63 -5.75
6 24 43.67 13.00 2.85 -5.30
7 31 -45.81 18.75 -1.99 -18.66
Various data Zoom ratio 3.78
Wide angle Medium telephoto focal length
F number 4.63 4.94 5.85
Half angle of view (degrees) 11.89 6.17 3.18
Image height 21.64 21.64 21.64
Total lens length 234.72 286.21 311.71
BF 67.26 70.32 75.88
d 6 1.50 53.00 78.50
d14 37.75 24.29 1.40
d19 1.61 11.57 26.37
d20 11.62 22.70 35.24
d23 16.52 8.94 4.50
d30 9.98 6.91 1.35
Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 194.15 20.68 -2.16 -15.67
2 7 -55.24 18.19 9.44 -4.03
3 15 78.73 12.59 2.08 -6.25
4 20 ∞ 0.00 0.00 -0.00
5 21 -202.64 5.27 -2.63 -5.75
6 24 43.67 13.00 2.85 -5.30
7 31 -45.81 18.75 -1.99 -18.66
（数値実施例２）
単位 mm
面データ
面番号 r d nd νd 有効径
1 109.825 6.83 1.62299 58.2 70.03
2 486.741 0.15 69.25
3 124.366 2.70 1.65412 39.7 67.65
4 60.181 0.11 64.09
5 60.552 10.65 1.43875 94.9 64.08
6 520.708 (可変) 63.15
7 135.343 3.31 1.57501 41.5 32.41
8 -218.571 1.70 1.77250 49.6 31.78
9 506.668 1.60 31.04
10 257.272 1.55 1.77250 49.6 30.18
11 56.613 4.37 29.27
12 -64.393 1.55 1.60311 60.6 29.21
13 59.293 3.03 1.84666 23.8 29.87
14 239.819 (可変) 29.94
15 140.271 5.94 1.43387 95.1 31.41
16 -48.549 0.15 31.55
17 186.418 5.14 1.51742 52.4 30.81
18 -44.528 1.60 1.90366 31.3 30.44
19 -139.117 (可変) 30.41
20(絞り) ∞ (可変) 28.04
21 -32.712 1.40 1.59270 35.3 27.58
22 42.917 5.24 1.78472 25.7 29.32
23 -93.483 11.17 29.53
24 -98.643 3.23 1.56732 42.8 29.51
25 -38.806 0.15 29.66
26 107.325 6.37 1.48749 70.2 28.41
27 -31.085 1.40 1.84666 23.8 27.80
28 -82.523 0.15 27.88
29 61.068 3.07 1.72916 54.7 27.53
30 374.733 (可変) 27.18
31 58.673 1.20 1.88300 40.8 24.19
32 24.885 3.67 22.95
33 -81.161 2.43 1.80518 25.4 22.95
34 -37.219 1.28 23.20
35 -35.128 1.20 1.72916 54.7 23.04
36 79.314 11.43 23.90
37 63.934 4.31 1.65412 39.7 31.76
38 -237.920 32.02
(Numerical example 2)
Unit mm
Surface data surface number rd nd νd Effective diameter
1 109.825 6.83 1.62299 58.2 70.03
2 486.741 0.15 69.25
3 124.366 2.70 1.65412 39.7 67.65
4 60.181 0.11 64.09
5 60.552 10.65 1.43875 94.9 64.08
6 520.708 (variable) 63.15
7 135.343 3.31 1.57501 41.5 32.41
8 -218.571 1.70 1.77250 49.6 31.78
9 506.668 1.60 31.04
10 257.272 1.55 1.77250 49.6 30.18
11 56.613 4.37 29.27
12 -64.393 1.55 1.60311 60.6 29.21
13 59.293 3.03 1.84666 23.8 29.87
14 239.819 (variable) 29.94
15 140.271 5.94 1.43387 95.1 31.41
16 -48.549 0.15 31.55
17 186.418 5.14 1.51742 52.4 30.81
18 -44.528 1.60 1.90366 31.3 30.44
19 -139.117 (variable) 30.41
20 (Aperture) ∞ (Variable) 28.04
21 -32.712 1.40 1.59270 35.3 27.58
22 42.917 5.24 1.78472 25.7 29.32
23 -93.483 11.17 29.53
24 -98.643 3.23 1.56732 42.8 29.51
25 -38.806 0.15 29.66
26 107.325 6.37 1.48749 70.2 28.41
27 -31.085 1.40 1.84666 23.8 27.80
28 -82.523 0.15 27.88
29 61.068 3.07 1.72916 54.7 27.53
30 374.733 (variable) 27.18
31 58.673 1.20 1.88300 40.8 24.19
32 24.885 3.67 22.95
33 -81.161 2.43 1.80518 25.4 22.95
34 -37.219 1.28 23.20
35 -35.128 1.20 1.72916 54.7 23.04
36 79.314 11.43 23.90
37 63.934 4.31 1.65412 39.7 31.76
38 -237.920 32.02
各種データ
ズーム比 3.78
広角 中間 望遠
焦点距離 102.79 200.07 389.04
Fナンバー 4.63 5.28 5.82
半画角（度） 11.89 6.17 3.18
像高 21.64 21.64 21.64
レンズ全長 234.73 277.97 314.72
BF 64.82 66.26 76.07
d 6 1.50 44.74 81.50
d14 40.46 17.60 7.94
d19 1.13 0.15 27.53
d20 6.16 30.00 12.28
d30 12.57 11.13 1.30
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 188.48 20.44 -2.75 -16.03
2 7 -56.83 17.10 9.29 -3.32
3 15 79.51 12.84 3.03 -5.55
4 20 ∞ 0.00 0.00 -0.00
5 21 49.70 32.18 22.91 2.28
6 31 -51.51 25.53 -6.28 -33.89
Various data Zoom ratio 3.78
Wide angle Medium telephoto focal length 102.79 200.07
F number 4.63 5.28 5.82
Half angle of view (degrees) 11.89 6.17 3.18
Image height 21.64 21.64 21.64
Total lens length 234.73 277.97 314.72
BF 64.82 66.26 76.07
d 6 1.50 44.74 81.50
d14 40.46 17.60 7.94
d19 1.13 0.15 27.53
d20 6.16 30.00 12.28
d30 12.57 11.13 1.30
Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 188.48 20.44 -2.75 -16.03
2 7 -56.83 17.10 9.29 -3.32
3 15 79.51 12.84 3.03 -5.55
4 20 ∞ 0.00 0.00 -0.00
5 21 49.70 32.18 22.91 2.28
6 31 -51.51 25.53 -6.28 -33.89
（数値実施例３）
単位 mm
面データ
面番号 r d nd νd 有効径
1 114.909 6.98 1.51742 52.4 69.84
2 1318.403 0.15 69.29
3 160.786 2.40 1.65412 39.7 68.03
4 61.162 11.12 1.49700 81.5 64.92
5 1013.394 (可変) 64.23
6 71.567 5.72 1.71736 29.5 38.65
7 -108.261 1.80 1.80000 29.8 37.92
8 74.091 2.90 35.53
9 333.638 1.30 1.69680 55.5 35.13
10 88.088 3.59 34.52
11 -107.636 1.20 1.72000 50.2 34.45
12 56.418 3.63 1.84666 23.8 34.84
13 209.035 (可変) 34.88
14 111.727 4.66 1.49700 81.5 35.51
15 -77.052 0.87 35.48
16 107.563 4.59 1.48749 70.2 34.41
17 -72.693 1.30 1.85026 32.3 34.09
18 -357.814 1.00 33.78
19(絞り) ∞ (可変) 33.40
20 -54.597 1.20 1.70154 41.2 26.88
21 58.803 3.32 1.80518 25.4 27.35
22 -384.072 (可変) 27.45
23 -453.709 2.97 1.69680 55.5 29.03
24 -59.514 0.15 29.13
25 87.137 4.74 1.60311 60.6 28.37
26 -50.452 1.20 1.84666 23.8 27.92
27 -336.205 0.15 27.46
28 56.349 2.49 1.77250 49.6 26.71
29 119.337 (可変) 26.16
30 59.968 1.20 1.88300 40.8 24.76
31 24.336 3.94 23.60
32 -144.877 3.60 1.80518 25.4 23.70
33 -30.273 1.02 24.03
34 -28.229 1.20 1.88300 40.8 23.73
35 90.154 1.20 24.96
36 48.620 4.55 1.69895 30.1 26.74
37 -332.814 27.19
(Numerical Example 3)
Unit mm
Surface data surface number rd nd νd Effective diameter
1 114.909 6.98 1.51742 52.4 69.84
2 1318.403 0.15 69.29
3 160.786 2.40 1.65412 39.7 68.03
4 61.162 11.12 1.49700 81.5 64.92
5 1013.394 (variable) 64.23
6 71.567 5.72 1.71736 29.5 38.65
7 -108.261 1.80 1.80000 29.8 37.92
8 74.091 2.90 35.53
9 333.638 1.30 1.69680 55.5 35.13
10 88.088 3.59 34.52
11 -107.636 1.20 1.72000 50.2 34.45
12 56.418 3.63 1.84666 23.8 34.84
13 209.035 (variable) 34.88
14 111.727 4.66 1.49700 81.5 35.51
15 -77.052 0.87 35.48
16 107.563 4.59 1.48749 70.2 34.41
17 -72.693 1.30 1.85026 32.3 34.09
18 -357.814 1.00 33.78
19 (Aperture) ∞ (Variable) 33.40
20 -54.597 1.20 1.70154 41.2 26.88
21 58.803 3.32 1.80518 25.4 27.35
22 -384.072 (variable) 27.45
23 -453.709 2.97 1.69680 55.5 29.03
24 -59.514 0.15 29.13
25 87.137 4.74 1.60311 60.6 28.37
26 -50.452 1.20 1.84666 23.8 27.92
27 -336.205 0.15 27.46
28 56.349 2.49 1.77250 49.6 26.71
29 119.337 (variable) 26.16
30 59.968 1.20 1.88300 40.8 24.76
31 24.336 3.94 23.60
32 -144.877 3.60 1.80518 25.4 23.70
33 -30.273 1.02 24.03
34 -28.229 1.20 1.88300 40.8 23.73
35 90.154 1.20 24.96
36 48.620 4.55 1.69895 30.1 26.74
37 -332.814 27.19
各種データ
ズーム比 3.82
広角 中間 望遠
焦点距離 102.20 200.00 390.00
Fナンバー 4.04 4.42 5.98
半画角（度） 11.95 6.17 3.18
像高 21.64 21.64 21.64
レンズ全長 218.20 248.87 280.18
BF 42.37 46.55 62.16
d 5 1.30 32.00 63.30
d13 36.97 12.03 1.28
d19 7.31 40.98 63.34
d22 23.00 14.26 2.66
d29 21.11 16.90 1.30
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 193.71 20.65 -0.97 -14.49
2 6 -66.25 20.14 14.05 -0.95
3 14 78.20 12.42 1.69 -7.08
4 20 -112.20 4.52 -0.74 -3.30
5 23 45.51 11.70 2.56 -4.50
6 30 -42.17 16.71 0.98 -11.35
Various data Zoom ratio 3.82
Wide angle Medium Telephoto focal length 102.20 200.00 390.00
F number 4.04 4.42 5.98
Half angle of view (degrees) 11.95 6.17 3.18
Image height 21.64 21.64 21.64
Total lens length 218.20 248.87 280.18
BF 42.37 46.55 62.16
d 5 1.30 32.00 63.30
d13 36.97 12.03 1.28
d19 7.31 40.98 63.34
d22 23.00 14.26 2.66
d29 21.11 16.90 1.30
Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 193.71 20.65 -0.97 -14.49
2 6 -66.25 20.14 14.05 -0.95
3 14 78.20 12.42 1.69 -7.08
4 20 -112.20 4.52 -0.74 -3.30
5 23 45.51 11.70 2.56 -4.50
6 30 -42.17 16.71 0.98 -11.35
Ｌ１ 第１レンズ群 Ｌ２ 第２レンズ群 Ｌ３ 第３レンズ群
Ｌ４ 第４レンズ群 Ｌ５ 第５レンズ群 Ｌ６ 第６レンズ群
ＬＲ 後群
L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group L5 5th lens group L6 6th lens group LR Rear group
Claims (11)
前記第２レンズ群は、像ぶれ補正に際して不動の第２ａ群と、像ぶれ補正に際して、光軸に対して垂直方向の成分を含むように移動する第２ｂ群より構成されており、
前記第２ａ群は正レンズＧ２ａｐと負レンズＧ２ａｎより構成され、
前記第２ｂ群は正レンズと２枚以上の負レンズを有し、
前記第２ａ群の焦点距離をｆ２ａ、前記第２レンズ群の焦点距離をｆ２、前記正レンズＧ２ａｐの材料のアッベ数をνｄ２ａｐとするとき、
２．４＜｜ｆ２ａ／ｆ２｜
２８＜νｄ２ａｐ＜５０
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 rear group including a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and one or more lens groups, which are arranged in order from the object side to the image side. In a zoom lens that is configured to change the interval between adjacent lens groups during zooming,
The second lens group includes a second a group that does not move during image blur correction, and a second b group that moves so as to include a component in a direction perpendicular to the optical axis during image blur correction.
The second group a includes a positive lens G2ap and a negative lens G2an.
The second group b has a positive lens and two or more negative lenses,
When the focal length of the second group a is f2a, the focal length of the second lens group is f2 , and the Abbe number of the material of the positive lens G2ap is νd2ap ,
2.4 <| f2a / f2 |
28 <νd2ap <50
A zoom lens satisfying the following conditional expression:
Ｘ２ａｐ＝−０．６４３８＋θｇＦ２ａｐ＋０．００１６８２×νｄ２ａｐ
Ｘ２ａｎ＝−０．６４３８＋θｇＦ２ａｎ＋０．００１６８２×νｄ２ａｎ
とおくとき、
０．００１＜Ｘ２ａｐ−Ｘ２ａｎ＜０．０３０
なる条件式を満足することを特徴とする請求項１又は２に記載のズームレンズ。 The partial dispersion ratio of the material of the positive lens G2ap is θgF2ap, the Abbe number of the material of the negative lens G2an is νd2an, the partial dispersion ratio of the material of the negative lens G2an is θgF2an,
X2ap = - 0.6438 + θgF2ap + 0.001682 × νd2ap
X2an = - 0.6438 + θgF2an + 0.001682 × νd2an
When you leave
0.001 <X2ap-X2an <0.030
The zoom lens according to claim 1 or 2, characterized by satisfying the conditional expression.
１．０２＜Ｎｄ２ａｎ／Ｎｄ２ａｐ＜１．５０
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 refractive index of the material of the negative lens G2an is Nd2an and the refractive index of the material of the positive lens G2ap is Nd2ap,
1.02 <Nd2an / Nd2ap <1.50
The zoom lens according to any one of claims 1 to 3, characterized by satisfying the conditional expression.
２．０＜−ｆ１／ｆ２＜５．０
なる条件式を満足することを特徴とする請求項１乃至４のいずれか１項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,
2.0 <−f1 / f2 <5.0
The zoom lens according to any one of claims 1 to 4, characterized by satisfying the conditional expression.
ズーミングに際して前記第２レンズ群と前記第５レンズ群は不動であり、前記第１レンズ群、前記第３レンズ群、前記第４レンズ群、及び前記第６レンズ群が移動することを特徴とする請求項１乃至５のいずれか１項に記載のズームレンズ。 A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power, which are arranged in order from the object side to the image side. , A fifth lens group having a positive refractive power and a sixth lens group having a negative refractive power,
The second lens group and the fifth lens group do not move during zooming, and the first lens group, the third lens group, the fourth lens group, and the sixth lens group move. the zoom lens according to any one of claims 1 to 5.
ズーミングに際して前記第２レンズ群は不動で、前記第１レンズ群、前記第３レンズ群、前記第４レンズ群、及び前記第５レンズ群が移動することを特徴とする請求項１乃至５のいずれか１項に記載のズームレンズ。 A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, which are arranged in order from the object side to the image side. A fifth lens unit having a negative refractive power,
The second lens group in zooming is immobile, the first lens group, either the third lens group, the fourth lens group, and of claims 1 to 5 wherein the fifth lens group and wherein the moving The zoom lens according to claim 1.
前記第２レンズ群は、像ぶれ補正に際して不動の第２ａ群と、像ぶれ補正に際して、光軸に対して垂直方向の成分を含むように移動する第２ｂ群より構成されており、 The second lens group includes a second a group that does not move during image blur correction, and a second b group that moves so as to include a component in a direction perpendicular to the optical axis during image blur correction.
前記第２ａ群は正レンズＧ２ａｐと負レンズＧ２ａｎより構成され、 The second group a includes a positive lens G2ap and a negative lens G2an.
前記第２ｂ群は、物体側から像側へ順に配置された、負レンズ、負レンズ、正レンズより構成され、 The second group b includes a negative lens, a negative lens, and a positive lens arranged in order from the object side to the image side.
前記第２ａ群の焦点距離をｆ２ａ、前記第２レンズ群の焦点距離をｆ２とするとき、 When the focal length of the second group a is f2a and the focal length of the second lens group is f2,
２．４＜｜ｆ２ａ／ｆ２｜ 2.4 <| f2a / f2 |
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 zoom lens satisfying the following conditional expression:
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| JP6794860B2 (en) * | 2016-05-16 | 2020-12-02 | リコーイメージング株式会社 | Zoom lens system |
| JP6980430B2 (en) | 2017-06-28 | 2021-12-15 | キヤノン株式会社 | Zoom lens and image pickup device with it |
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| JP6952235B2 (en) | 2017-08-04 | 2021-10-20 | 株式会社シグマ | Variable magnification imaging optical system |
| JP6904853B2 (en) | 2017-08-30 | 2021-07-21 | キヤノン株式会社 | Zoom lens and imaging device with it |
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