JP2016024301A5

JP2016024301A5 -

Info

Publication number: JP2016024301A5
Application number: JP2014147666A
Authority: JP
Filing date: 2014-07-18
Publication date: 2017-08-17
Anticipated expiration: 2034-07-18

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、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を有し、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、物体側より像側へ順に配置された、負の屈折力の第１部分レンズ群と、光軸に対して垂直方向の成分を持つ方向に移動することにより結像位置を移動させる第２部分レンズ群から成り、前記第２部分レンズ群は、正レンズと負レンズを有し、前記第２レンズ群の焦点距離をｆ２、広角端における全系の焦点距離をｆｗ、前記第２部分レンズ群に含まれる負レンズの材料の屈折率をＮ２ｎとしたとき、
−３．０＜ｆ２／ｆｗ＜−１．０
１．８４＜Ｎ２ｎ＜２．２０
なる条件式を満足することを特徴とするズームレンズ。 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, a third lens group having a positive refractive power, and one or more lenses disposed in order from the object side to the image side. has a rear group comprising lens groups, the zoom lens distance of the lens units vary adjacent zooming, the second lens group, disposed in order from the object side to the image side, a negative refractive power and 1 partial lens unit consists of a second partial lens group to move the imaging position by moving in a direction having a component in a direction perpendicular to the optical axis, the second partial lens group, a positive lens and a negative lens has a focal length of the second lens group f2, the focal length of the entire system at the wide angle end fw, when the N2n the refractive index of the material of the negative lens included in said second lens subunit,
−3.0 <f2 / fw <−1.0
1.84 <N2n <2.20
A zoom lens satisfying the following conditional expression:

Claims

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 in which the interval between adjacent lens groups changes during zooming,
The second lens group is arranged in order from the object side to the image side, and the first partial lens group having a negative refractive power and an image forming position by moving in a direction having a component perpendicular to the optical axis. A second partial lens group for moving
The second partial lens group has a positive lens and a negative lens,
When the focal length of the second lens group is f2, the focal length of the entire system at the wide angle end is fw, and the refractive index of the negative lens material included in the second partial lens group is N2n,
−3.0 <f2 / fw <−1.0
1.84 <N2n <2.20
A zoom lens satisfying the following conditional expression:

When the refractive index of the material of the positive lens included in the second partial lens group is N2p,
1.90 <N2p <2.20
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

The zoom lens according to claim 1, wherein the first partial lens group includes a negative lens and a positive lens.

When the focal length of the second partial lens group is f22,
1.00 <f22 / f2 <10.00
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,
5.00 <f1 / fw <30.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the focal length of the third lens group is f3,
1.50 <f3 / fw <8.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the distance on the optical axis between the lens surface closest to the image side of the first partial lens group and the lens surface closest to the object side of the second partial lens group is D2,
0.10 <D2 / | f2 | <0.50
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the Abbe number of the material of the positive lens included in the second partial lens group is νd22p, and the Abbe number of the material of the negative lens included in the second partial lens group is νd22n,
5.00 <νd22n−νd22p <25.00
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

9. The image forming position is moved by rotating the second partial lens group about one point on or near the optical axis as a rotation center. The described zoom lens.

The second partial lens group includes a negative lens and a positive lens disposed on the image side with respect to the negative lens, and the negative lens and the positive lens are disposed with an air gap therebetween. The zoom lens according to claim 1.

When the radius of curvature of the image side lens surface of the negative lens included in the second partial lens group is R22, and the radius of curvature of the object side lens surface of the positive lens included in the second partial lens group is R23,
−200.00 <(R22 + R23) / (R22−R23) <10.00
The zoom lens according to claim 10, wherein the following conditional expression is satisfied.

When the radius of curvature of the object side lens surface of the negative lens included in the second partial lens group is R21, and the radius of curvature of the image side lens surface of the positive lens included in the second partial lens group is R24,
-10.00 <(R21 + R24) / (R21-R24) <10.00
The zoom lens according to claim 10, wherein the following conditional expression is satisfied.

The zoom lens according to any one of claims 1 to 12, wherein the rear group includes a fourth lens group having a positive refractive power.

The zoom lens according to any one of claims 1 to 12, wherein the rear group includes a fourth lens group having a negative refractive power and a fifth lens group having a positive refractive power.

A zoom lens according to any one of claims 1 to 14, an imaging apparatus characterized by having an imaging element for receiving an image formed by the zoom lens.

The imaging apparatus according to claim 15 , wherein the imaging position is moved by rotating the second partial lens group about one point on or near the optical axis.
When the diagonal length of the effective imaging surface of the imaging device is L, and the distance at the telephoto end from the lens surface closest to the object side of the second partial lens group to the rotation center is TD,
3.00 <| TD | / L <30.00
An imaging device characterized by satisfying the following conditional expression: