JP2016136174A5

JP2016136174A5 -

Info

Publication number: JP2016136174A5
Application number: JP2015010850A
Authority: JP
Filing date: 2015-01-23
Publication date: 2018-03-01

Description

上記目的を達成するために、本発明のズームレンズ及び、それを有する撮像装置は、物体側から像側へ順に、ズーミングのためには不動の正の屈折力の第１レンズ群、ズーミングに際して移動する負の屈折力の第２レンズ群、ズーミングに際して移動する正の屈折力の第３レンズ群、ズーミングに際して移動する正の第４レンズ群、ズーミングのためには不動の正の屈折力の第５レンズ群から構成されるズームレンズにおいて、
前記第３レンズ群の焦点距離をｆ３、前記第４レンズ群の焦点距離をｆ４、前記ズームレンズの広角端における前記第３レンズ群と第４レンズ群の間隔をＬ３４ｗ、前記ズームレンズのズーム比をｚとしたとき、ズーム比ｚ^0.25のズーム位置ｚ１における前記第３レンズ群と第４レンズ群の間隔をL３４ｚ１、ズーム比ｚ^0.4 のズーム位置ｚ２における前記第３レンズ群と前記第４レンズ群の間隔をL３４ｚ２、ズーム比ｚ^0.7 のズーム位置ｚ３における前記第３レンズ群と前記第４レンズ群の間隔をL３４ｚ３、広角端の前記第２レンズ群と前記第３レンズ群の間隔をL２３ｗとしたとき
0.02＜(L34z1−L34w)／L23w＜0.2
0.02＜(L34z1−L34z3)／L23w＜0.2
0.1＜f3／f4＜0.8
0.03＜(L34z1−L34z3)／L23w×L34z2／(L34z1＋L34z3)＜0.1
なる条件式を満足する事を特徴としている。 In order to achieve the above object, the zoom lens of the present invention and the image pickup apparatus having the same move in order from the object side to the image side, the first lens unit having a positive refractive power that does not move for zooming, and moves during zooming. A second lens group having a negative refractive power, a third lens group having a positive refractive power that moves during zooming, a fourth lens group that moves during zooming, and a fifth lens having a positive refractive power that does not move for zooming. In zoom lenses composed of lens groups,
The focal length of the third lens group is f3, the focal length of the fourth lens group is f4, the distance between the third lens group and the fourth lens group at the wide-angle end of the zoom lens is L34w, and the zoom ratio of the zoom lens the when the z, L34z1 an interval between the third lens group and the fourth lens group at the zoom position z1 of the zoom ratio z ^0.25, the fourth lens group and the third lens unit at the zoom position z2 of the zoom ratio z ^0.4 The distance between the third lens group and the fourth lens group at the zoom position z3 with a zoom ratio z ^0.7 is L34z3, and the distance between the second lens group at the wide angle end and the third lens group is L23w. When
0.02 <(L34z1-L34w) / L23w <0.2
0.02 <(L34z1-L34z3) / L23w <0.2
0.1 <f3 / f4 <0.8
0.03 <(L34z1-L34z3) / L23w × L34z2 / (L34z1 + L34z3) <0.1
It is characterized by satisfying the following conditional expression.

次に各実施例の特徴について説明する。本発明のズームレンズにおいて、第３レンズ群Ｕ３の焦点距離をｆ３、第４レンズ群Ｕ４の焦点距離をｆ４とする。広角端における第３レンズ群Ｕ３と第４レンズ群Ｕ４の間隔をＬ３４ｗとする。ズーム比をｚとしたとき、ズーム比ｚ^0.25のズーム位置ｚ１における第３レンズ群Ｕ３と第４レンズ群Ｕ４の間隔をL３４ｚ１とする。ズーム比ｚ^0.4 のズーム位置ｚ２における第３レンズ群Ｕ３と第４レンズ群Ｕ４の間隔をL３４ｚ２とする。ズーム比ｚ^0.7 のズーム位置ｚ３における第３レンズ群Ｕ３と第４レンズ群Ｕ４の間隔をL３４ｚ３とする。広角端の第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔をL２３ｗとする。このとき、
0.02＜(L34z1−L34w)／L23w＜0.2 ・・・（１）
0.02＜(L34z1−L34z3)／L23w＜0.2 ・・・（２）
0.1＜f3／f4＜0.8 ・・・（３）
0.02＜(L34z1−L34z3)／L23w×L34z2／(L34z1＋L34z3)＜0.1 ・・・（４）
なる条件を満足している。 Next, features of each embodiment will be described. In the zoom lens of the present invention, the focal length of the third lens unit U3 is f3, and the focal length of the fourth lens unit U4 is f4. The distance between the third lens unit U3 and the fourth lens unit U4 at the wide angle end is L34w. When the zoom ratio is z, the distance between the third lens unit U3 and the fourth lens unit U4 at the zoom position z1 at the zoom ratio z ^0.25 is L34z1. The third lens unit U3 at the zoom position z2 of the zoom ratio z ^0.4 and the distance between the fourth lens group U4 and L34z2. The distance between the third lens unit U3 and the fourth lens unit U4 at the zoom position z3 with the zoom ratio z ^0.7 is L34z3. The distance between the second lens unit U2 and the third lens unit U3 at the wide-angle end is L23w. At this time,
0.02 <(L34z1-L34w) / L23w <0.2 (1)
0.02 <(L34z1-L34z3) / L23w <0.2 (2)
0.1 <f3 / f4 <0.8 (3)
0.02 <(L34z1−L34z3) / L23w × L34z2 / (L34z1 + L34z3) <0.1 (4)
Is satisfied.

条件式（２）の上限が満たされないと、第３レンズ群Ｕ３と第４レンズ群Ｕ４の移動量が増大し、良好なズーム操作性を得るのが困難となる。
If the upper limit of conditional expression (2) is not satisfied, the amount of movement of the third lens unit U3 and the fourth lens unit U4 increases, making it difficult to obtain good zoom operability.

Claims

In order from the object side to the image side, a first lens unit having a positive refractive power that does not move for zooming, a second lens unit having a negative refractive power that moves during zooming, and a third lens that has a positive refractive power that moves during zooming. In a zoom lens composed of a lens group, a positive fourth lens group that moves during zooming, and a fifth lens group that does not move for zooming and has a positive refractive power,
The focal length of the third lens group is f3, the focal length of the fourth lens group is f4, the distance between the third lens group and the fourth lens group at the wide-angle end of the zoom lens is L34w, and the zoom of the zoom lens when the ratio was z, L34z1 an interval between the fourth lens group and the third lens unit at the zoom position z1 of the zoom ratio z ^0.25, the said third lens group in the zoom position z2 of the zoom ratio z ^0.4 4 the distance between the lens groups L34z2, the said third lens group in the zoom position z3 zoom ratio z ^0.7 fourth lens group spacing L34z3, the third lens group and the second lens group at the wide angle end of the zoom lens When the interval is set to L23w,
0.02 <(L34z1-L34w) / L23w <0.2
0.02 <(L34z1-L34z3) / L23w <0.2
0.1 <f3 / f4 <0.8
0.02 <(L34z1-L34z3) / L23w × L34z2 / (L34z1 + L34z3) <0.1
A zoom lens characterized by satisfying