JP2017078768A5

JP2017078768A5 -

Info

Publication number: JP2017078768A5
Application number: JP2015206170A
Authority: JP
Filing date: 2015-10-20
Publication date: 2019-05-30
Anticipated expiration: 2035-10-20

Description

本発明は、例えば、広画角、高変倍比、小型軽量、および全ズーム範囲に渡る高い光学性能の点で有利なズームレンズの提供を目的とする。 The present invention is, for example, a wide field angle, a high zoom ratio, and an object thereof is to provide a compact, lightweight, and points at favorable zoom lens passes Ru high optical performance in the entire zoom range.

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移動しない負の屈折力を有する第１レンズ群と、ズーミングのために移動し正の屈折力を有する第２レンズ群と、開口絞りを含みズーミングのためには移動しない負の屈折力を有する第３レンズ群と、ズーミングのために移動する第４レンズ群と、ズーミングのためには移動しない第５レンズ群と、から構成され、ズーミングのために、前記第２レンズ群および前記第４レンズ群に含まれる少なくとも３つのサブレンズ群が光軸方向に移動するズームレンズであって、前記第１レンズ群および前記第３レンズ群の焦点距離をそれぞれｆ１およびｆ３とし、広角端から望遠端へのズーミングにおいて、前記第２レンズ群に含まれるサブレンズ群の中で最も移動するサブレンズ群の移動量をｍ２とし、広角端から望遠端へのズーミングにおいて、前記第４レンズ群に含まれるサブレンズ群の中で最も移動するサブレンズ群の移動量をｍ４として、
０．６＜ｆ１／ｆ３＜４．０
１．４＜｜ｍ２｜／｜ｍ４｜＜５０．０
なる条件式を満足する、
ことを特徴とする。 To achieve the above object, an image pickup apparatus including a zoom lens and the same of the present invention, in order from the object side to the image side, a first lens group having a negative refractive power which does not move for zooming, zooming a second lens group having a moving positive refractive power in order, a third lens group having negative refractive power which does not move for zooming comprises an aperture stop, a fourth lens group that move for zooming If, for zooming consists, and the fifth lens group does not move, for zooming, at least three sub-lens group in the optical axis direction included in the second lens group and the fourth lens group a zoom lens moves, the first lens group and the focal length of the third lens group, respectively f1 and f3, during zooming from the wide-angle end to the telephoto end, the second lens The amount of movement of the sub-lens group moved farthest in the sub-lens group included in the group and m2, in zooming from the wide-angle end to the telephoto end, the most moved in the sub-lens group included in the fourth lens group the amount of movement of the sub-lens group as a m4,
0.6 <f1 / f3 <4.0
1.4 <| m2 | / | m4 | <50.0
Satisfy the conditional expression
It is characterized by

本発明によれば、例えば、広画角、高変倍比、小型軽量、および全ズーム範囲に渡る高い光学性能の点で有利なズームレンズを提供できる。 According to the present invention, for example, a wide field angle, a high zoom ratio, it is possible to provide a small and light, and the point at advantageous zoom lens passes Ru high optical performance in the entire zoom range.

Claims

In order from the object side to the image side, zooming includes a first lens group having negative refractive power which does not move for zooming, a second lens group having a moving positive refractive power for zooming, the aperture stop of the third lens group having negative refractive power which does not move for a fourth lens group that move for zooming, for zooming consists, and the fifth lens group does not move, zooming for at least three sub-lens group included in the second lens group and the fourth lens group a zoom lens moves in the optical axis direction,
Wherein the first lens group and the focal length of the third lens group is f1 and f3, respectively, during zooming from the wide-angle end to the telephoto end, the most moving sub-lens in the sub-lens group included in the second lens group the amount of movement of the group and m2, in zooming from the wide-angle end to the telephoto end, the amount of movement of the sub-lens group moved farthest in the sub-lens group included in the fourth lens group as a m4,
0.6 <f1 / f3 <4.0
1.4 <| m2 | / | m4 | <50.0
Satisfy the conditional expression
Zoom lens characterized by.

Wherein the β2_w the lateral magnification at the wide-angle end of the second lens group, and a β2_t a lateral magnification at a telephoto end of the second lens group,
1.5 <β2_t / β2_w <4.0
The zoom lens according to claim 1, which satisfies the following conditional expression .

The focal length of the zoom lens in a state and the wide-angle end and focused on infinity as fw, the conditional expression -5.0 <f1 / fw <-1.5
The zoom lens according to claim 1 , wherein the zoom lens according to claim 1 is satisfied.

The lateral magnification of the second lens group at the wide angle end to the Beta2_w, condition | β2_w | <1.0
The zoom lens according to any one of claims 1 to 3, characterized by satisfying the.

The third lens group, a zoom lens according to any one of claims 1 to 4, characterized in that it comprises a lens having a negative refractive power of at least two.

The most object side lens in the first lens group, a zoom lens according to any one of claims 1 to 5, characterized and this having a negative refractive power.

Wherein the first lens group, claim 1, wherein the eleventh sub-lens group having negative refractive power which does not move for focusing, the Rukoto such and a twelfth sub lens unit which moves for focusing or zoom lens according to any one of claims 6.

The twelfth sub lens group has a positive refractive power, the first 11 and the focal length of the sub-lens group f11, and a focal length of the first 12 sub-lens group and F12p,
−0.15 <f11 / f12 p <−0.04
The zoom lens according to claim 7 , satisfying the following conditional expression .

The twelfth sub lens group has a negative refractive power, the first 11 and the focal length of the sub-lens group f11, and a focal length of the first 12 sub-lens group and F12n,
0.3 <f11 / f12 n <0.8
The zoom lens according to any one of claims 7, characterized by satisfying the conditional expression.

The second lens group has at least one one convex lens and a cemented lens made up of a single concave lens,
The Abbe number of the previous SL-convex lens and .nu.2p, a partial dispersion ratio of the lens and Shita2p, the Abbe number of the concave lens and Nyu2n, a partial dispersion ratio of the concave lens as Shita2n,
−3.00 × 10 ⁻³ <(θ 2 p −θ 2 n) / (ν 2 p −ν 2 n) <− 1.5 × 10 ⁻³
Satisfy the conditional expression
The zoom lens according to any one of claims 1 to claim 9, characterized in that.
The Abbe number dd and the partial dispersion ratio θgF are respectively Nb, NF, Nd, and NC, respectively, as the refractive index to the g-line, F-line, d-line, and C-line of the Fraunfofa line.
dd = (Nd-1) / (NF-NC), and
θgF = (Ng-NF) / (NF-NC)
It is expressed by the following equation.

The second lens group and the fourth lens group, the zoom lens according to any one of claims 1 to 10, characterized in that it comprises a lens having at least one aspherical surface.

The second lens group comprises, in any one of claims 1 to claim 11, characterized in that it comprises a first 21 sub-lens group and the 22 sub lens unit which moves in different trajectory each other for zooming Zoom lens described.

Assuming that the focal length of the twenty first sub lens unit is f21,
−0.60 <f1 / f21 <−0.15
The zoom lens according to claim 12, satisfying the following conditional expression.

Assuming that the focal length of the fourth lens group is f4
−1.00 <f1 / f4 <−0.15
The zoom lens according to any one of claims 1 to 13, which satisfies the following conditional expression.

The focal length of the first sub lens group is f21, and the focal length of the second sub lens group is f22.
0.8 <f21 / f22 <1.8
The zoom lens according to claim 12 or 13, wherein the following conditional expression is satisfied.

A zoom lens according to any one of claims 1 to 15,
An imaging element you receive an image formed by said zoom lens,
An imaging apparatus characterized by having: