JP2015125383A5

JP2015125383A5 -

Info

Publication number: JP2015125383A5
Application number: JP2013271402A
Authority: JP
Filing date: 2013-12-27
Publication date: 2017-02-16
Anticipated expiration: 2033-12-27

Description

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、正の屈折力の第２レンズ群、１以上のレンズ群を含む後群からなり、ズーミングに際して隣り合うレンズ群の間隔が変化するズームレンズであって、
前記後群は、負レンズ成分と、該負レンズ成分の像側に隣接して配置された正レンズ成分を有し、前記負レンズ成分と前記正レンズ成分により正の屈折力の空気レンズが形成され、
前記後群のうち前記空気レンズよりも物体側にフォーカシングに際して移動するフォーカスレンズ成分を有し、
無限遠にフォーカスしているときの広角端における前記空気レンズの焦点距離をｆａ、無限遠にフォーカスしているときの広角端における全系の焦点距離をｆｗとするとき、
１．００＜ｆａ／ｆｗ＜８．００
なる条件式を満足することを特徴としている。 The zoom lens of the present invention comprises a rear group including a first lens group having a negative refractive power, a second lens group having a positive refractive power, and one or more lens groups arranged in order from the object side to the image side. A zoom lens in which the interval between adjacent lens groups changes during zooming,
The rear group includes a negative lens component and a positive lens component disposed adjacent to the image side of the negative lens component, and an air lens having a positive refractive power is formed by the negative lens component and the positive lens component. And
A focusing lens component that moves during focusing to the object side of the air lens in the rear group;
When the focal length of the air lens at the wide-angle end when focusing at infinity is fa, and the focal length of the entire system at the wide-angle end when focusing at infinity is fw,
1.00 <fa / fw <8.00
It satisfies the following conditional expression.

以下に本発明の好ましい実施の形態を添付の図面に基づいて詳細に説明する。本発明のズームレンズは、物体側より像側へ順に配置された、負の屈折力の第１レンズ群、正の屈折力の第２レンズ群、１以上のレンズ群を含む後群からなり、ズーミングに際して隣り合うレンズ群の間隔が変化する。後群は、負レンズ成分と、負レンズ成分の像側に隣接して配置された正レンズ成分を有している。負レンズ成分と正レンズ成分により正の屈折力の空気レンズが形成される。後群のうち空気レンズよりも物体側にフォーカシングに際して移動するフォーカスレンズ成分を有している。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The zoom lens of the present invention comprises a rear group including a first lens group having a negative refractive power, a second lens group having a positive refractive power, and one or more lens groups arranged in order from the object side to the image side. The distance between adjacent lens units changes during zooming. The rear group includes a negative lens component and a positive lens component disposed adjacent to the image side of the negative lens component . An air lens having a positive refractive power is formed by the negative lens component and the positive lens component. The rear lens group includes a focus lens component that moves toward the object side of the air lens during focusing.

また、非点収差を示す図において、実線のＳはｄ線のサジタル方向、破線のＭはｄ線のメリディオナル方向を表している。また、歪曲を示す図は、ｄ線における歪曲を表している。倍率色収差図において２点鎖線のｇはｄ線に対する倍率色収差を示している。ＦｎｏはＦナンバー、ωは撮影画角の半画角（度）である。 In the diagram showing astigmatism, the solid line S represents the sagittal direction of the d line, and the broken line M represents the meridional direction of the d line. Moreover, the figure which shows distortion represents the distortion in d line | wire. In the chromatic aberration diagram of magnification, g of the two-dot chain line indicates the chromatic aberration of magnification with respect to the d line. Fno is the F number, and ω is the half angle of view (degrees) of the shooting angle of view.

第１レンズ群Ｂ１に含まれるレンズの中で、最も物体側に配置された負レンズの物体側と像側のレンズ面の参照曲率半径を各々Ｒ１ａ，Ｒ１ｂとし、
ＳＦｇ１＝（Ｒ１ａ＋Ｒ１ｂ）／（Ｒ１ａ−Ｒ１ｂ）
とおく。ここでレンズ面が球面の場合は参照曲率半径を曲率半径とする。またレンズ面が非球面の場合には、参照曲率半径とは非球面の光軸上の一点と非球面の有効径で定まる２点との合計３点を通る球面の曲率半径である。 Among the lenses included in the first lens group B1, each reference radius of curvature of the lens surface on the most object side of the negative lens disposed on the object side and the image side R1a, and R1b,
SFg1 = (R1a + R1b) / (R1a-R1b)
far. Here, when the lens surface is spherical, the reference radius of curvature is defined as the radius of curvature. When the lens surface is an aspherical surface, the reference radius of curvature is the radius of curvature of the spherical surface that passes through a total of three points: one point on the optical axis of the aspherical surface and two points determined by the effective diameter of the aspherical surface.

０．１５＜Ｌａ／Ｌｗ＜０．５０・・・（２）
０．４０＜ＳＦｇ１＜１．５０・・・（３）
−１．００＜ＳＦａ＜２．００・・・（４）
−５．００＜ＳＦｎ＜０．００・・・（５）
−３．５０＜ｆ１／ｆｗ＜−１．７５・・・（６）
５．００＜Ｌｗ／ｆｗ＜９．００・・・（７）
０．２５＜｜（１−βｆＷ²）×βＲＷ²｜＜１．００・・・（８）
１．００＜｜（１−βｆＴ²）×βＲＴ²｜＜４．００・・・（９）
１．００＜｜ｍｆ｜／ｆｗ＜４．００・・・（１０）
１０．００＜｜ｆｂｆ／ｆｗ｜・・・（１１） 0.15 <La / Lw <0.50 (2)
0.40 <SFg1 <1.50 (3)
-1.00 <SFa <2.00 (4)
-5.00 <SFn <0.00 (5)
−3.50 <f1 / fw <−1.75 (6)
5.00 <Lw / fw <9.00 (7)
0.25 <| (1-βfW ² ) × βRW ² | <1.00 (8)
1.00 <| (1-βfT ² ) × βRT ² | <4.00 (9)
1.00 <| mf | / fw <4.00 (10)
10.00 <| fbf / fw | (11)

０．１６＜Ｌａ／Ｌｗ＜０．４８・・・（２ａ）
０．４０＜ＳＦｇ１＜１．２０・・・（３ａ）
−０．８０＜ＳＦａ＜１．８０・・・（４ａ）
−４．８０＜ＳＦｎ＜−０．２０・・・（５ａ）
−３．２０＜ｆ１／ｆｗ＜−１．８０・・・（６ａ）
５．５０＜Ｌｗ／ｆｗ＜８．５０・・・（７ａ）
０．２８＜｜（１−βｆＷ²）×βＲＷ²｜＜０．９０・・・（８ａ）
１．１０＜｜（１−βｆＴ²）×βＲＴ²｜＜３．９５・・・（９ａ）
１．２０＜｜ｍｆ｜／ｆｗ＜３．５０・・・（１０ａ）
１２．００＜｜ｆｂｆ／ｆｗ｜・・・（１１ａ） 0.16 <La / Lw <0.48 (2a)
0.40 <SFg1 <1.20 (3a)
−0.80 <SFa <1.80 (4a)
-4.80 <SFn <−0.20 (5a)
-3.20 <f1 / fw <-1.80 (6a)
5.50 <Lw / fw <8.50 (7a)
0.28 <| (1-βfW ² ) × βRW ² | <0.90 (8a)
1.10 <| (1-βfT ² ) × βRT ² | <3.95 (9a)
1.20 <| mf | / fw <3.50 (10a)
12.00 <| fbf / fw | (11a)

さらに好ましくは条件式（２）乃至（１１）の数値範囲を次のように設定することが好ましい。
０．１８＜Ｌａ／Ｌｗ＜０．４５・・・（２ｂ）
０．４０＜ＳＦｇ１＜１．００・・・（３ｂ）
−０．５０＜ＳＦａ＜１．６０・・・（４ｂ）
−４．５０＜ＳＦｎ＜―０．５０・・・（５ｂ）
−２．８０＜ｆ１／ｆｗ＜−２．００・・・（６ｂ）
６．００＜Ｌｗ／ｆｗ＜８．００・・・（７ｂ）
０．３０＜｜（１−βｆＷ²）×βＲＷ²｜＜０．８０・・・（８ｂ）
１．１５＜｜（１−βｆＴ²）×βＲＴ²｜＜３．９０・・・（９ｂ）
１．５０＜｜ｍｆ｜／ｆｗ＜３．００・・・（１０ｂ）
１５．００＜｜ｆｂｆ／ｆｗ｜・・・（１１ｂ） More preferably, the numerical ranges of the conditional expressions (2) to (11) are set as follows.
0.18 <La / Lw <0.45 (2b)
0.40 <SFg1 <1.00 (3b)
-0.50 <SFa <1.60 (4b)
−4.50 <SFn <−0.50 (5b)
-2.80 <f1 / fw <-2.00 (6b)
6.00 <Lw / fw <8.00 (7b)
0.30 <| (1-βfW ² ) × βRW ² | <0.80 (8b)
1.15 <| (1-βfT ² ) × βRT ² | <3.90 (9b)
1.50 <| mf | / fw <3.00 (10b)
15.00 <| fbf / fw | (11b)

(数値実施例１)
面データ
面番号 r d nd νd 有効径
1* -49.890 1.20 1.85135 40.1 23.60
2* 14.483 4.50 20.70
3 34.566 2.28 1.94595 18.0 21.20
4 221.131 (可変) 21.00
5(絞り) ∞ 0.00 12.61
6* 11.778 3.19 1.76802 49.2 13.10
7* -135.194 0.15 12.60
8 11.418 2.79 1.69680 55.5 11.30
9 487.139 0.50 1.76182 26.5 10.20
10 6.768 (可変) 8.50
11 ∞ (可変) 7.86
12 29.486 2.61 1.49700 81.5 11.40
13 -19.440 2.73 11.70
14* -8.767 0.50 1.58313 59.4 11.70
15* -32.696 (可変) 12.50
16* 20.296 3.32 1.85135 40.1 18.90
17 -537.100 1.32 18.60
18 ∞ 1.30 1.51633 64.1 25.00
19 ∞ 1.00 25.00
像面 ∞ (Numerical example 1)
Surface data surface number rd nd νd Effective diameter
1 * -49.890 1.20 1.85135 40.1 23.60
2 * 14.483 4.50 20.70
3 34.566 2.28 1.94595 18.0 21.20
4 221.131 (variable) 21.00
5 (Aperture) ∞ 0.00 12.61
6 * 11.778 3.19 1.76802 49.2 13.10
7 * -135.194 0.15 12.60
8 11.418 2.79 1.69680 55.5 11.30
9 487.139 0.50 1.76182 26.5 10.20
10 6.768 (variable) 8.50
11 ∞ (variable) 7.86
12 29.486 2.61 1.49700 81.5 11.40
13 -19.440 2.73 11.70
14 * -8.767 0.50 1.58313 59.4 11.70
15 * -32.696 (variable) 12.50
16 * 20.296 3.32 1.85135 40.1 18.90
17 -537.100 1.32 18.60
18 ∞ 1.30 1.51633 64.1 25.00
19 ∞ 1.00 25.00
Image plane ∞

(数値実施例７)
面データ
面番号 r d nd νd 有効径
1* -50.216 1.20 1.85135 40.1 23.40
2* 14.911 4.50 20.50
3 34.803 2.07 1.94595 18.0 20.90
4 195.977 (可変) 20.70
5* 11.565 3.17 1.76802 49.2 13.10
6* -132.558 0.15 12.60
7 11.315 2.53 1.69680 55.5 11.30
8 188.978 0.50 1.76182 26.5 10.30
9 6.776 4.71 8.60
10(絞り) ∞ (可変) 7.48
11 22.547 2.71 1.49700 81.5 11.10
12 -20.057 2.85 11.20
13* -8.395 0.50 1.58313 59.4 11.30
14* -35.696 (可変) 12.10
15* 23.358 2.84 1.85135 40.1 18.00
16 -2017.082 0.72 17.80
17 ∞ 1.30 1.51633 64.1 25.00
18 ∞ 1.00 25.00
像面 ∞ (Numerical example 7)
Surface data surface number rd nd νd Effective diameter
1 * -50.216 1.20 1.85135 40.1 23.40
2 * 14.911 4.50 20.50
3 34.803 2.07 1.94595 18.0 20.90
4 195.977 (variable) 20.70
5 * 11.565 3.17 1.76802 49.2 13.10
6 * -132.558 0.15 12.60
7 11.315 2.53 1.69680 55.5 11.30
8 188.978 0.50 1.76182 26.5 10.30
9 6.776 4.71 8.60
10 (Aperture) ∞ (Variable) 7.48
11 22.547 2.71 1.49700 81.5 11.10
12 -20.057 2.85 11.20
13 * -8.395 0.50 1.58313 59.4 11.30
14 * -35.696 (variable) 12.10
15 * 23.358 2.84 1.85135 40.1 18.00
16 -2017.082 0.72 17.80
17 ∞ 1.30 1.51633 64.1 25.00
18 ∞ 1.00 25.00
Image plane ∞

Claims

The first lens group having a negative refractive power, the second lens group having a positive refractive power, and a rear group including one or more lens groups arranged in order from the object side to the image side. A zoom lens with a variable interval,
The rear group includes a negative lens component and a positive lens component disposed adjacent to the image side of the negative lens component, and an air lens having a positive refractive power is formed by the negative lens component and the positive lens component. And
A focusing lens component that moves during focusing to the object side of the air lens in the rear group;
When the focal length of the air lens at the wide-angle end when focusing at infinity is fa, and the focal length of the entire system at the wide-angle end when focusing at infinity is fw,
1.00 <fa / fw <8.00
A zoom lens satisfying the following conditional expression:

When the lens further includes an aperture stop and is focused at infinity, the distance on the optical axis from the object-side lens surface of the air lens to the aperture stop at the wide-angle end is La, and the total lens length at the wide-angle end is Lw. and when,
0.15 <La / Lw <0.50
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

The object side of the negative lens arranged closest to the object side in the first lens lens included in the group and the image side lens surface of the reference radius of curvature respectively R1a, and R1b,
SFg1 = (R1a + R1b) / (R1a-R1b)
When
0.40 <SFg1 <1.50
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

The reference radii of curvature of the lens surface on the object side and the image side of the air lens are RFa and RFb , respectively , and SFa = (RFa + RFb) / (RFa−RFb)
When
-1.00 <SFa <2.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

Rna and Rnb are the reference curvature radii of the object side and image side lens surfaces of the negative lens component, respectively.
SFn = (Rna + Rnb) / (Rna−Rnb)
When you and,
-5.00 <SFn <0.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the focal length of the first lens group is f1,
−3.50 <f1 / fw <−1.75
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the total lens length at the wide angle end is Lw,
5.00 <Lw / fw <9.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

The lateral magnification of the focus lens component at the wide-angle end when focusing at infinity is βfw , and the lens system disposed on the image side of the focus lens component at the wide-angle end when focusing at infinity The lateral magnification of the focus lens component at the telephoto end when the lateral magnification is βRW, and the focus lens component at the telephoto end when the focus is at infinity is arranged on the image side. When the lateral magnification of the lens system is βRT,
0.25 <| (1-βfW ² ) × βRW ² | <1.00
1.00 <| (1-βfT ² ) × βRT ² | <4.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the amount of movement of the focus lens component in zooming from the wide-angle end to the telephoto end when focusing at infinity is mf,
1.00 <| mf | / fw <4.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the combined focal length at the wide-angle end of the lens system disposed on the object side with respect to the negative lens component when focusing at infinity is fbf,
10.00 <| fbf / fw |
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

The rear group includes 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. During zooming, the first lens group and the second lens group are arranged. The lens group and the third lens group move,
The third lens group includes a sub-group B3P having a positive refractive power and a sub-group B3N having a negative refractive power , which are arranged in order from the object side to the image side.
It said subgroup B3N is the negative lens component, a zoom lens according to any one of claims 1 to 10 wherein the fourth lens group, wherein the a positive lens component.

The rear group includes a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, which are arranged in order from the object side to the image side. When moving all the lens groups,
The fourth lens group is the negative lens component, a zoom lens according to any one of claims 1 to 10 wherein the fifth lens group, wherein the a positive lens component.

The rear group includes a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, which are arranged in order from the object side to the image side. At the time, the first lens group, the second lens group, the third lens group, the fourth lens group move,
The fourth lens group is the negative lens component, a zoom lens according to any one of claims 1 to 10 wherein the fifth lens group, wherein the a positive lens component.

A zoom lens according to any one of claims 1 to 13, an imaging apparatus characterized by and an image pickup element that receives an image formed by the zoom lens.

When the amount of distortion at the maximum angle of view at the wide angle end is DistW,
DistW <-12%
The image pickup apparatus according to claim 14 , wherein the following conditional expression is satisfied.