JP2016048354A5

JP2016048354A5 -

Info

Publication number: JP2016048354A5
Application number: JP2014173917A
Authority: JP
Filing date: 2014-08-28
Publication date: 2017-09-28
Anticipated expiration: 2034-08-28

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、正の屈折力の第３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であって、
前記後群は全体として正の屈折力を有し、前記第３レンズ群は前記後群の最も物体側に配置され、ズーミングに際して、前記第１レンズ群、前記第２レンズ群、前記第３レンズ群は移動し、
広角端における全系の焦点距離をｆｗ、望遠端における全系の焦点距離をｆｔ、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、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、前記第２レンズ群、前記第３レンズ群の移動量をそれぞれｍ１、ｍ２、ｍ３とするとき、
０．８＜｜ｆ２／ｆｗ｜＜１．５
１．１＜ｆ１／ｆｔ＜２．０
−１．９＜ｍ１／ｍ２＜−１．０
−２．３＜ｍ３／ｍ２＜−１．１
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, and a third lens group having a positive refractive power, which are arranged in order from the object side to the image side. A zoom lens having a group, and an interval between adjacent lens groups is changed during zooming,
The rear group as a whole has a positive refractive power, the third lens group is disposed closest to the object side of the rear group, and the first lens group, the second lens group, and the third lens are arranged during zooming. The group moves,
The focal length of the entire system at the wide angle end is fw, the focal length of the entire system at the telephoto end is ft, the focal length of the first lens group is f1, the focal length of the second lens group is f2, and from the wide angle end to the telephoto end. When the movement amounts of the first lens group, the second lens group, and the third lens group in zooming are m1, m2, and m3, respectively,
0.8 <| f2 / fw | <1.5
1.1 <f1 / ft <2.0
-1.9 <m1 / m2 <-1.0
-2.3 <m3 / m2 <-1.1
It satisfies the following conditional expression.

以下、本発明のズームレンズ系及びそれを有する撮像装置の実施例について説明する。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。第３レンズ群は後群の最も物体側に配置されている。ズーミングに際して第１レンズ群、第２レンズ群、第３レンズ群が移動する。 Embodiments of the zoom lens system of the present invention and an image pickup apparatus having the same will be described below. 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 refractive power, which are arranged in order from the object side to the image side. And the distance between adjacent lens groups changes during zooming. The third lens group is disposed on the most object side of the rear group. During zooming, the first lens group, the second lens group, and the third lens group move.

各実施例のズームレンズ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。それによれば各条件式に対応した効果が得られる。第３レンズ群Ｌ３の焦点距離をｆ３とする。望遠端におけるズームレンズ（全系）のＦナンバーをＦｎｏｔとする。 In the zoom lens of each embodiment, it is more preferable to satisfy one or more of the following conditional expressions. According to this, an effect corresponding to each conditional expression can be obtained. Let the focal length of the third lens unit L3 be f3. The F-number of the zoom lens ( entire system ) at the telephoto end is Fnot.

広角端から望遠端へのズーミングに際して、全てのレンズ群が移動することが良い。これによれば高ズーム比化を図りつつ、ズーミングに際しての収差変動を軽減するのが容易になる。 From the wide-angle end on the occasion zooming to the telephoto end, all lens groups is better to move. This makes it easy to reduce aberration fluctuations during zooming while achieving a high zoom ratio.

Claims

The zoom lens has a rear group including 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. A zoom lens in which the interval between adjacent lens groups changes,
The rear group as a whole has a positive refractive power, the third lens group is disposed closest to the object side of the rear group, and the first lens group, the second lens group, and the third lens are arranged during zooming. The group moves,
The focal length of the entire system at the wide angle end is fw, the focal length of the entire system at the telephoto end is ft, the focal length of the first lens group is f1, the focal length of the second lens group is f2, and from the wide angle end to the telephoto end. When the moving amounts of the first lens group, the second lens group, and the third lens group in zooming are m1, m2, and m3, respectively,
0.8 <| f2 / fw | <1.5
1.1 <f1 / ft <2.0
-1.9 <m1 / m2 <-1.0
-2.3 <m3 / m2 <-1.1
A zoom lens satisfying the following conditional expression:

4.2 <f1 / fw <7.5
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,
1.0 <f3 / fw <4.0
The zoom lens according to claim 1 or 2, characterized by satisfying the conditional expression.

The zoom lens according to any one of claims 1 to 3, wherein the rear group includes five or more lenses.

The second lens group zoom lens according to any one of claims 1 to 4, characterized in that monotonically moves toward the image side during zooming to the telephoto end from the wide-angle end.

From the wide-angle end on the occasion zooming to the telephoto end, the zoom lens according to any one of claims 1 to 5 is all the lens thus being moved.

When the F-number of the zoom lens at the telephoto end is Fnot,
0.1 <Fnot / (ft / fw) <1.0
The zoom lens according to any one of claims 1 to 6, characterized by satisfying the conditional expression.

The rear group includes a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power, which are arranged in order from the object side to the image side. the zoom lens according to any one of claims 1 to 7, characterized in.

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. the zoom lens according to any one of claims 1 to 7, characterized in.

The rear group includes a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, a fifth lens group having a negative refractive power, and a positive refractive power arranged in order from the object side to the image side. the zoom lens according to any one of claims 1 to 7, characterized in that it is composed of a sixth lens group.

A zoom lens according to any one of claims 1 to 10, an imaging apparatus characterized by comprising an imaging element for receiving an image formed by the zoom lens.

The F-number of the zoom lens at the telephoto end is Fnot, and the maximum incident height at which the on-axis ray or off-axis ray passes through the lens surface on the most object side of the third lens group during zooming from the wide-angle end to the telephoto end. When the value is hgt and half of the diagonal length of the effective range of the image sensor is Ymax,
0.2 <hgt / (Ymax · Fnot) <1.0
The imaging apparatus according to claim 11, wherein the following conditional expression is satisfied.