JP2015132637A5

JP2015132637A5 -

Info

Publication number: JP2015132637A5
Application number: JP2014002329A
Authority: JP
Filing date: 2014-01-09
Publication date: 2017-02-16
Anticipated expiration: 2034-01-09

Description

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、正又は負の屈折力の第３レンズ群、正又は負の屈折力の第４レンズ群、正の屈折力の第５レンズ群、負の屈折力の第６レンズ群、正の屈折力の第７レンズ群から構成され、ズーミングに際して隣り合うレンズ群の間隔が変化するズームレンズにおいて、像ぶれ補正に際して、前記第６レンズ群が光軸に対して垂直方向の成分を持つように移動し、前記第６レンズ群の焦点距離をｆ６、広角端における全系の焦点距離をｆｗ、望遠端における前記第６レンズ群の横倍率をβ６ｔ、望遠端における前記第７レンズ群の横倍率をβ７ｔとするとき、
−６．０＜（１−β６ｔ）×β７ｔ＜−２．０
−５．０＜ｆ６／ｆｗ＜−０．５
なる条件式を満たすことを特徴としている。 The zoom lens according to the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive or negative refractive power, which are arranged in order from the object side to the image side. A fourth lens group having positive or negative refractive power, a fifth lens group having positive refractive power, a sixth lens group having negative refractive power, and a seventh lens group having positive refractive power, and are adjacent to each other during zooming In a zoom lens in which the distance between the groups is changed, during image blur correction, the sixth lens group moves so as to have a component in a direction perpendicular to the optical axis, and the focal length of the sixth lens group is f6. When the focal length of the entire lens system is fw, the lateral magnification of the sixth lens group at the telephoto end is β6t, and the lateral magnification of the seventh lens group at the telephoto end is β7t,
−6.0 <(1−β6t) × β7t <−2.0
−5.0 <f6 / fw <−0.5
It is characterized by satisfying 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、配置された次のレンズ群より構成されている。正の屈折力（光学的パワー＝焦点距離の逆数）の第１レンズ群、負の屈折力の第２レンズ群、正又は負の屈折力の第３レンズ群、正又は負の第４レンズ群、正の屈折力の第５レンズ群、負の屈折力の第６レンズ群、正の屈折力の第７レンズ群より構成されている。そしてズーミングに際して、隣り合うレンズ群の間隔が変化する。

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 the following lens groups arranged in order from the object side to the image side . First lens group having positive refractive power (optical power = reciprocal of focal length), second lens group having negative refractive power, third lens group having positive or negative refractive power, and fourth lens group having positive or negative refractive power The fifth lens group has a positive refractive power, the sixth lens group has a negative refractive power, and the seventh lens group has a positive refractive power. During zooming, the interval between adjacent lens groups changes.

Claims

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 or negative refractive power, and a positive or negative refractive power arranged in order from the object side to the image side. the fourth lens group, the fifth lens unit having positive refractive power, a sixth lens unit having a negative refractive power and a seventh lens unit having a positive refractive power, the distance between lens adjacent when's Mingu changes In zoom lenses,
During image blur correction, the sixth lens group moves so as to have a component perpendicular to the optical axis,
The focal length of the sixth lens group is f6, the focal length of the entire system at the wide angle end is fw, the lateral magnification of the sixth lens group at the telephoto end is β6t, and the lateral magnification of the seventh lens group at the telephoto end is β7t. and when,
−6.0 <(1−β6t) × β7t <−2.0
−5.0 <f6 / fw <−0.5
A zoom lens characterized by satisfying the following conditional expression:

When the focal length of the second lens group is f2, and the focal length of the entire system at the telephoto end is ft,
0.05 <| f2 | / ft <0.50
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the focal length of the fifth lens group is f5 and the focal length of the entire system at the telephoto end is ft,
0.05 <f5 / ft <0.50
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,
2.0 <f1 / fw <9.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the focal length of the second lens group is f2,
0.25 <f2 / f6 <2.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the focal length of the seventh lens group is f7 and the focal length of the entire system at the telephoto end is ft,
0.15 <f7 / ft <2.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the lateral magnification of the second lens group at the wide angle end is β2w and the lateral magnification of the second lens group at the telephoto end is β2t,
1.1 <β2t / β2w <8.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the lateral magnification of the sixth lens group at the wide angle end is β6w and the lateral magnification of the seventh lens group at the wide angle end is β7w,
1.0 <(β6t / β6w) × (β7t / β7w) <2.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

The third lens group has a positive refractive power, the fourth lens group has a negative refractive power, the focal length of the third lens group is f3, and the focal length of the fourth lens group is f4. and when,
0.5 <| f3 / f4 | <1.2
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

The sixth lens group includes one positive lens G6p and one negative lens G6n. When the Abbe number of the material of the positive lens G6p is νd6p and the Abbe number of the material of the negative lens G6n is νd6n,
1.2 <νd6n / νd6p <3.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied .

The sixth lens group includes one positive lens G6p and one negative lens G6n. When the focal length of the negative lens G6n is f6n,
0.02 <f6n / f6 <0.60
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

A zoom lens according to any one of claims 1 to 1 1, an imaging apparatus characterized by having an imaging device that captures an image formed by the zoom lens.