JP5987542B2

JP5987542B2 - Zoom lens, optical device

Info

Publication number: JP5987542B2
Application number: JP2012175836A
Authority: JP
Inventors: 真美村谷
Original assignee: Nikon Corp
Current assignee: Nikon Corp
Priority date: 2012-08-08
Filing date: 2012-08-08
Publication date: 2016-09-07
Anticipated expiration: 2032-08-08
Also published as: JP2014035402A

Description

本発明は、固体撮像素子を有する小型カメラ等に好適なズームレンズと、これを有する光学装置に関する。 The present invention relates to an optical device including a zoom lens suitable compact camera, it has a solid-state imaging device.

従来、固体撮像素子を有する小型カメラ等に好適な負レンズ先行のズームレンズが提案されている（例えば、特許文献１を参照。）。 Conventionally, a zoom lens preceding a negative lens suitable for a small camera having a solid-state imaging device has been proposed (see, for example, Patent Document 1).

特開２００１−２１５４０７号公報JP 2001-215407 A

負正構成の２群ズームレンズは、単純な構成で小型化には適しているが、更に小型化しようとして負屈折力の第１レンズ群を少ない枚数の負レンズと正レンズの２枚のレンズだけで構成した場合には、諸収差を良好に補正することが難しくなる。収差補正を行う為には、２枚のレンズ間隔を十分に広げる必要があり、結果として第１レンズ群全体の厚みが増してしまい小型化を達成することが困難となる。また、第２レンズ群の構成によっては収差補正が不十分であったり、ズームレンズを構成する各レンズの位置敏感度が上がり製造において歩留まりが悪化するといった問題がある。 The negative-positive two-group zoom lens has a simple configuration and is suitable for miniaturization, but in order to further reduce the size, the first lens unit having negative refractive power is reduced to two lenses, a negative lens and a positive lens. In the case where it is configured only with this, it becomes difficult to correct various aberrations satisfactorily. In order to perform aberration correction, it is necessary to sufficiently widen the distance between the two lenses, and as a result, the thickness of the entire first lens group increases, making it difficult to achieve miniaturization. In addition, depending on the configuration of the second lens group, there is a problem that aberration correction is insufficient, or the positional sensitivity of each lens constituting the zoom lens is increased, resulting in a deterioration in manufacturing yield.

小型でありながら諸収差を良好に補正した高い結像性能を有するズームレンズと、これを有する光学装置を提供する。 Provided are a zoom lens having a high imaging performance in which various aberrations are favorably corrected while being small, and an optical apparatus having the zoom lens.

上記課題を解決するため、本発明は、
物体側より順に、負屈折力の第１レンズ群と、正屈折力の第２レンズ群とにより実質的に２個のレンズ群からなり、
広角端状態から望遠端状態への変倍の際、前記第１レンズ群と前記第２レンズ群の間隔が変化し、
前記第１レンズ群は、物体側より順に、像面側に凹面を向けた負メニスカスレンズと、負レンズと、物体側に凸面を向けた正レンズを有し、
前記第２レンズ群は、物体側より順に、正レンズと、第１接合レンズと、第２接合レンズを有し、
前記第１接合レンズは、負の屈折力を有し、
前記第２接合レンズは、正の屈折力を有し、
以下の条件を満足することを特徴とするズームレンズを提供する。
０．５０＜Ｓ１／ｆｗ＜０．８８
０．００＜ (ｒ２Ｆ＋ｒ１Ｒ)／(ｒ２Ｆ−ｒ１Ｒ) ≦ １．０６２
但し、
Ｓ１：前記第１レンズ群の、最も物体側のレンズ面から最も像面側のレンズ面までの光軸上の距離
ｆｗ：広角端状態における前記ズームレンズの焦点距離
ｒ１Ｒ：前記第１レンズ群の前記負メニスカスレンズの像面側のレンズ面の曲率半径
ｒ２Ｆ：前記第１レンズ群の前記負レンズの物体側のレンズ面の曲率半径
また、本発明は、
物体側より順に、負屈折力の第１レンズ群と、正屈折力の第２レンズ群とにより実質的に２個のレンズ群からなり、
広角端状態から望遠端状態への変倍の際、前記第１レンズ群と前記第２レンズ群の間隔が変化し、
前記第１レンズ群は、物体側より順に、像面側に凹面を向けた負メニスカスレンズと、負レンズと、物体側に凸面を向けた正レンズを有し、
前記第２レンズ群は、物体側より順に、正レンズと、第１接合レンズと、第２接合レンズを有し、
前記第１接合レンズは、負の屈折力を有し、
以下の条件を満足することを特徴とするズームレンズを提供する。
０．５０＜Ｓ１／ｆｗ＜０．８８
０．００＜ (ｒ２Ｆ＋ｒ１Ｒ)／(ｒ２Ｆ−ｒ１Ｒ) ≦ ０．８５５
但し、
Ｓ１：前記第１レンズ群の、最も物体側のレンズ面から最も像面側のレンズ面までの光軸上の距離
ｆｗ：広角端状態における前記ズームレンズの焦点距離
ｒ１Ｒ：前記第１レンズ群の前記負メニスカスレンズの像面側のレンズ面の曲率半径
ｒ２Ｆ：前記第１レンズ群の前記負レンズの物体側のレンズ面の曲率半径
また、本発明は、
物体側より順に、負屈折力の第１レンズ群と、正屈折力の第２レンズ群とにより実質的に２個のレンズ群からなり、
広角端状態から望遠端状態への変倍の際、前記第１レンズ群と前記第２レンズ群の間隔が変化し、
前記第１レンズ群は、物体側より順に、像面側に凹面を向けた負メニスカスレンズと、負レンズと、物体側に凸面を向けた正レンズを有し、
前記第２レンズ群は、物体側より順に、正レンズと、第１接合レンズと、第２接合レンズを有し、
前記第２接合レンズは、物体側から順に、負レンズと正レンズからなり、
以下の条件を満足することを特徴とするズームレンズを提供する。
０．５０＜Ｓ１／ｆｗ＜０．８８
０．００＜ (ｒ２Ｆ＋ｒ１Ｒ)／(ｒ２Ｆ−ｒ１Ｒ) ＜２．００
但し、
Ｓ１：前記第１レンズ群の、最も物体側のレンズ面から最も像面側のレンズ面までの光軸上の距離
ｆｗ：広角端状態における前記ズームレンズの焦点距離
ｒ１Ｒ：前記第１レンズ群の前記負メニスカスレンズの像面側のレンズ面の曲率半径
ｒ２Ｆ：前記第１レンズ群の前記負レンズの物体側のレンズ面の曲率半径 In order to solve the above problems, the present invention provides:
In order from the object side, the first lens group having negative refracting power and the second lens group having positive refracting power substantially consist of two lens groups,
During zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group changes,
The first lens group includes, in order from the object side, a negative meniscus lens having a concave surface facing the image surface side, a negative lens, and a positive lens having a convex surface facing the object side,
The second lens group includes, in order from the object side, a positive lens, a first cemented lens, and a second cemented lens.
The first cemented lens has negative refractive power,
The second cemented lens has a positive refractive power,
A zoom lens characterized by satisfying the following conditions is provided.
0.50 <S1 / fw <0.88
0.00 <(r2F + r1R) / (r2F−r1R) ≦ 1.062
However,
S1: Distance on the optical axis from the most object side lens surface to the most image side lens surface of the first lens group fw: Focal length of the zoom lens in the wide-angle end state r1R: of the first lens group Radius of curvature of the lens surface on the image side of the negative meniscus lens r2F: radius of curvature of the lens surface on the object side of the negative lens of the first lens group
The present invention also provides:
In order from the object side, the first lens group having negative refracting power and the second lens group having positive refracting power substantially consist of two lens groups,
During zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group changes,
The first lens group includes, in order from the object side, a negative meniscus lens having a concave surface facing the image surface side, a negative lens, and a positive lens having a convex surface facing the object side,
The second lens group includes, in order from the object side, a positive lens, a first cemented lens, and a second cemented lens.
The first cemented lens has negative refractive power,
A zoom lens characterized by satisfying the following conditions is provided.
0.50 <S1 / fw <0.88
0.00 <(r2F + r1R) / (r2F−r1R) ≦ 0.855
However,
S1: distance on the optical axis from the most object side lens surface to the most image side lens surface of the first lens group
fw: focal length of the zoom lens in the wide-angle end state
r1R: radius of curvature of the lens surface on the image plane side of the negative meniscus lens of the first lens group
r2F: radius of curvature of the object side lens surface of the negative lens of the first lens group
The present invention also provides:
In order from the object side, the first lens group having negative refracting power and the second lens group having positive refracting power substantially consist of two lens groups,
During zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group changes,
The first lens group includes, in order from the object side, a negative meniscus lens having a concave surface facing the image surface side, a negative lens, and a positive lens having a convex surface facing the object side,
The second lens group includes, in order from the object side, a positive lens, a first cemented lens, and a second cemented lens.
The second cemented lens is composed of a negative lens and a positive lens in order from the object side,
A zoom lens characterized by satisfying the following conditions is provided.
0.50 <S1 / fw <0.88
0.00 <(r2F + r1R) / (r2F-r1R) <2.00
However,
S1: distance on the optical axis from the most object side lens surface to the most image side lens surface of the first lens group
fw: focal length of the zoom lens in the wide-angle end state
r1R: radius of curvature of the lens surface on the image plane side of the negative meniscus lens of the first lens group
r2F: radius of curvature of the object side lens surface of the negative lens of the first lens group

また、本発明は、上記ズームレンズを具備することを特徴とする光学装置を提供する。 The present invention also provides an optical apparatus comprising the zoom lens.

本発明によれば、小型でありながら諸収差を良好に補正した高い結像性能を有するズームレンズと、これを有する光学装置を提供することができる。 According to the present invention, it is possible to provide a zoom lens having a high imaging performance in which various aberrations are favorably corrected while being small, and an optical apparatus having the zoom lens.

本願の第１実施例に係るズームレンズのレンズ構成を示す断面図であり、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。1 is a cross-sectional view illustrating a lens configuration of a zoom lens according to Example 1 of the present application, in which (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows a telephoto end state. 本願の第１実施例に係るズームレンズの無限遠合焦時の諸収差図を示し、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。FIG. 4A illustrates various aberration diagrams of the zoom lens according to Example 1 of the present application when focusing on infinity, where (a) illustrates a wide-angle end state, (b) illustrates an intermediate focal length state, and (c) illustrates a telephoto end state. Each is shown. 本願の第２実施例に係るズームレンズのレンズ構成を示す断面図であり、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。It is sectional drawing which shows the lens structure of the zoom lens which concerns on 2nd Example of this application, (a) shows a wide angle end state, (b) shows an intermediate focal distance state, (c) shows a telephoto end state, respectively. 本願の第２実施例に係るズームレンズの無限遠合焦時の諸収差図を示し、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。FIG. 7A shows aberration diagrams of the zoom lens according to Example 2 of the present application at the time of focusing on infinity, (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows a telephoto end state. Each is shown. 本願の第３実施例に係るズームレンズのレンズ構成を示す断面図であり、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。It is sectional drawing which shows the lens structure of the zoom lens which concerns on 3rd Example of this application, (a) shows a wide-angle end state, (b) shows an intermediate focal distance state, (c) shows a telephoto end state, respectively. 本願の第３実施例に係るズームレンズの無限遠合焦時の諸収差図を示し、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。FIG. 7A shows various aberration diagrams of the zoom lens according to Example 3 of the present application when focusing on infinity, where (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows a telephoto end state. Each is shown. 本願の第４実施例に係るズームレンズのレンズ構成を示す断面図であり、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。It is sectional drawing which shows the lens structure of the zoom lens which concerns on 4th Example of this application, (a) shows a wide angle end state, (b) shows an intermediate focal distance state, (c) shows a telephoto end state, respectively. 本願の第４実施例に係るズームレンズの無限遠合焦時の諸収差図を示し、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。FIG. 9A shows various aberration diagrams of the zoom lens according to Example 4 of the present application at the time of focusing on infinity, (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows a telephoto end state. Each is shown. 本願の第５実施例に係るズームレンズのレンズ構成を示す断面図であり、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。It is sectional drawing which shows the lens structure of the zoom lens which concerns on 5th Example of this application, (a) shows a wide-angle end state, (b) shows an intermediate focal distance state, (c) shows a telephoto end state, respectively. 本願の第５実施例に係るズームレンズの無限遠合焦時の諸収差図を示し、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。FIG. 6A shows various aberration diagrams of the zoom lens according to Example 5 of the present application when focusing on infinity, (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows a telephoto end state. Each is shown. 本願のズームレンズを搭載したカメラの一例を示す。An example of a camera equipped with the zoom lens of the present application is shown. 本願のズームレンズの製造方法を示すフローチャートである。It is a flowchart which shows the manufacturing method of the zoom lens of this application.

以下、本願の実施形態にかかるズームレンズと、これを有する光学装置、およびズームレンズの製造方法について説明する。なお、以下の実施の形態は、発明の理解を容易にするためのものに過ぎず、本願発明の技術的思想を逸脱しない範囲において当業者により実施可能な付加・置換等を施すことを排除することは意図していない。 Hereinafter, a zoom lens according to an embodiment of the present application, an optical device having the zoom lens, and a method for manufacturing the zoom lens will be described. The following embodiments are only for facilitating the understanding of the invention, and excluding additions and substitutions that can be performed by those skilled in the art without departing from the technical idea of the present invention. It is not intended.

本願に係るズームレンズは、物体側より順に、負屈折力の第１レンズ群と、正屈折力の第２レンズ群を有し、広角端状態から望遠端状態への変倍の際、前記第１レンズ群と前記第２レンズ群の間隔が変化し、前記第１レンズ群は、物体側より順に、像面側に凹面を向けた負メニスカスレンズと、負レンズと、物体側に凸面を向けた正レンズを有し、前記第２レンズ群は、物体側より順に、正レンズと、第１接合レンズと、第２接合レンズを有する構成である。 The zoom lens according to the present application includes, in order from the object side, a first lens unit having a negative refractive power and a second lens group having a positive refractive power, and at the time of zooming from the wide-angle end state to the telephoto end state, The distance between the first lens group and the second lens group changes, and the first lens group has a negative meniscus lens having a concave surface facing the image surface side, a negative lens, and a convex surface facing the object side, in order from the object side. The second lens group includes a positive lens, a first cemented lens, and a second cemented lens in order from the object side.

本願のズームレンズでは、第１レンズ群と第２レンズ群を上記構成にすることで、収差を良好に補正しながら小型化を達成できる。また少ない枚数のレンズで各レンズ群を構成し、製造時の位置誤差による結像性能の悪化を抑えることができる。 In the zoom lens according to the present application, the first lens group and the second lens group are configured as described above, so that it is possible to reduce the size while correcting aberrations favorably. In addition, each lens group can be configured with a small number of lenses, and deterioration in imaging performance due to position errors during manufacturing can be suppressed.

また、負屈折力の第１レンズ群と、正屈折力の第２レンズ群を有するズームレンズは、各レンズ群の構成を比較的単純にできるが、広角端状態と望遠端状態とで入射光の高さが大きく変化するため、第１レンズ群での収差補正が重要となる。また第１レンズ群の大型化は、直接カメラ全体の大きさに影響を与えてしまうため、できるだけ薄く小さくしたいところである。第１レンズ群が厚肉化しないようにしながら、収差補正を良好に行うためには、第１レンズ群を物体側より順に、像面側に凹面を向けた負メニスカスレンズと、負レンズと、物体側に凸面を向けた正レンズを有するように構成するのが非常に効果的である。 In addition, a zoom lens having a first lens group having a negative refractive power and a second lens group having a positive refractive power can make the configuration of each lens group relatively simple, but incident light in a wide-angle end state and a telephoto end state. Since the height of the lens changes greatly, it is important to correct aberrations in the first lens group. Further, since the increase in size of the first lens group directly affects the size of the entire camera, it is desirable to make it as thin and small as possible. In order to satisfactorily correct the aberration while preventing the first lens group from being thickened, a negative meniscus lens having a concave surface on the image plane side in order from the object side, a negative lens, It is very effective to have a positive lens having a convex surface facing the object side.

また、本願のズームレンズは、以下の条件式（１）、（２）を満足する。
（１）０．５０＜Ｓ１／ｆｗ＜０．８８
（２）０．００＜ (ｒ２Ｆ＋ｒ１Ｒ)／(ｒ２Ｆ−ｒ１Ｒ) ＜２．００
但し、Ｓ１は前記第１レンズ群の、最も物体側のレンズ面から最も像面側のレンズ面までの光軸上の距離、ｆｗは広角端状態における前記ズームレンズの焦点距離、ｒ１Ｒは前記第１レンズ群の前記負メニスカスレンズの像面側のレンズ面の曲率半径、ｒ２Ｆは前記第１レンズ群の前記負レンズの物体側のレンズ面の曲率半径である。 Further, the zoom lens of the present application satisfies the following conditional expressions (1) and (2).
(1) 0.50 <S1 / fw <0.88
(2) 0.00 <(r2F + r1R) / (r2F-r1R) <2.00
Where S1 is the distance on the optical axis from the most object side lens surface to the most image side lens surface of the first lens group, fw is the focal length of the zoom lens in the wide-angle end state, and r1R is the first lens unit. The radius of curvature of the lens surface on the image side of the negative meniscus lens in one lens group, and r2F is the radius of curvature of the lens surface on the object side of the negative lens in the first lens group.

条件式（１）は、ズームレンズの小型化を達成するために、第１レンズ群の総厚（第１レンズ群の、最も物体側のレンズ面から最も像面側のレンズ面までの光軸上の距離）を広角端状態の焦点距離で規定したものである。この条件式（１）を満たすことで小型化しつつ球面収差、コマ収差、歪曲収差を良好に補正することができ、像面湾曲の変動を抑えて、高い結像性能を達成することができる。 Conditional expression (1) indicates that the total thickness of the first lens group (the optical axis from the lens surface closest to the object side to the lens surface closest to the image plane in the first lens group) in order to achieve downsizing of the zoom lens The upper distance) is defined by the focal length in the wide-angle end state. By satisfying the conditional expression (1), it is possible to satisfactorily correct spherical aberration, coma aberration, and distortion aberration while reducing the size, and it is possible to achieve high imaging performance while suppressing fluctuations in field curvature.

条件式（１）の上限値を超えると、ズームレンズの全長及び直径が大型化し、小型化が困難になる。それでもなおズームレンズの小型化を図ると球面収差を良好に補正するのが困難になるため好ましくない。また、像面湾曲の変動が増すため好ましくない。 When the upper limit value of conditional expression (1) is exceeded, the overall length and diameter of the zoom lens increase, making it difficult to reduce the size. Nevertheless, it is not preferable to reduce the size of the zoom lens because it becomes difficult to correct spherical aberration well. Further, it is not preferable because the variation in curvature of field increases.

条件式（１）の下限値を超えると、軸外のコマ収差や歪曲収差を十分に補正することが困難になるため好ましくない。 Exceeding the lower limit value of conditional expression (1) is not preferable because it is difficult to sufficiently correct off-axis coma and distortion.

なお、本願の効果を確実にするために、条件式（１）の上限値を０．８５にすることが好ましい。さらに本願の効果を確実にするために、上限値を０．８０にすることが好ましい。また、本願の効果を確実にするために、条件式（１）の下限値を０．６０にすることが好ましい。さらに本願の効果を確実にするために、下限値を０．７０にすることが好ましい。 In order to secure the effect of the present application, it is preferable to set the upper limit of conditional expression (1) to 0.85. Furthermore, in order to ensure the effect of the present application, it is preferable to set the upper limit value to 0.80. In order to secure the effect of the present application, it is preferable to set the lower limit of conditional expression (1) to 0.60. Furthermore, in order to ensure the effect of the present application, it is preferable to set the lower limit value to 0.70.

条件式（２）は、第１レンズ群内の最も物体側に配置された負メニスカスレンズと、その像面側に配置された負レンズとの間に形成されるいわゆる空気レンズの形状因子を適切な範囲に規定するものである。なお、当該負メニスカスレンズの像面側のレンズ面、当該負レンズの物体側のレンズ面に非球面が形成されている場合、近軸曲率半径を用いて条件式（２）の対応値を計算するものとする。この条件式（２）を満たすことでＦナンバーを小さくし、歪曲収差を良好に補正して、広角端状態での十分な周辺光量を保つことができ、高い結像性能を達成することができる。 Conditional expression (2) appropriately sets the shape factor of a so-called air lens formed between the negative meniscus lens disposed closest to the object side in the first lens group and the negative lens disposed on the image plane side. It is specified in the range. If an aspheric surface is formed on the image surface side lens surface of the negative meniscus lens and the object side lens surface of the negative lens, the corresponding value of the conditional expression (2) is calculated using the paraxial radius of curvature. It shall be. By satisfying this conditional expression (2), the F number can be reduced, distortion can be corrected well, a sufficient amount of peripheral light at the wide-angle end state can be maintained, and high imaging performance can be achieved. .

条件式（２）の上限値を超えると、倍率色収差の良好な補正が困難になるため好ましくない。またズームレンズのＦナンバーが大きくなってしまうため好ましくない。 Exceeding the upper limit of conditional expression (2) is not preferable because it is difficult to satisfactorily correct lateral chromatic aberration. Moreover, since the F number of the zoom lens becomes large, it is not preferable.

条件式（２）の下限値を超えると、十分な歪曲収差の補正が困難になってしまうため好ましくない。または広角端状態で十分な周辺光量を保つことが困難になってしまうため好ましくない。 Exceeding the lower limit of conditional expression (2) is not preferable because it becomes difficult to sufficiently correct distortion. Or it is not preferable because it becomes difficult to maintain a sufficient amount of peripheral light in the wide-angle end state.

なお、本願の効果を確実にするために、条件式（２）の上限値を１．５０にすることが好ましい。さらに本願の効果を確実にするために、上限値を１．００にすることが好ましい。また、本願の効果を確実にするために、条件式（２）の下限値を０．３０にすることが好ましい。さらに本願の効果を確実にするために、下限値を０．５０にすることが好ましい。 In order to secure the effect of the present application, it is preferable to set the upper limit of conditional expression (2) to 1.50. Furthermore, in order to ensure the effect of the present application, it is preferable to set the upper limit value to 1.00. In order to secure the effect of the present application, it is preferable to set the lower limit of conditional expression (2) to 0.30. Furthermore, in order to ensure the effect of the present application, it is preferable to set the lower limit value to 0.50.

以上の構成により、本発明によれば、小型でありながら諸収差を良好に補正した高い結像性能を有するズームレンズを実現できる。 With the above configuration, according to the present invention, it is possible to realize a zoom lens having high imaging performance in which various aberrations are favorably corrected while being small.

また、本願のズームレンズでは、第１接合レンズは負の屈折力を有することが望ましい。このように、第１接合レンズを負の屈折力を有するものとすることで球面収差等の諸収差を良好に補正して高い結像性能を達成することができる。 In the zoom lens of the present application, it is desirable that the first cemented lens has a negative refractive power. Thus, by making the first cemented lens have a negative refractive power, it is possible to satisfactorily correct various aberrations such as spherical aberration and achieve high imaging performance.

また、本願のズームレンズでは、第２接合レンズは正の屈折力を有することが望ましい。このように、第２接合レンズを正の屈折力を有するものとすることで球面収差等の諸収差を良好に補正して高い結像性能を達成することができる。 In the zoom lens of the present application, it is desirable that the second cemented lens has a positive refractive power. Thus, by making the second cemented lens have a positive refractive power, it is possible to satisfactorily correct various aberrations such as spherical aberration and achieve high imaging performance.

また、本願のズームレンズは、以下の条件式（３）を満足することが望ましい。
（３）０．５０＜ｆＬ１／ｆ１＜１．００
但し、ｆＬ１は前記第１レンズの前記負メニスカスレンズの焦点距離、ｆ１は前記第１レンズ群の焦点距離である。 Moreover, it is desirable that the zoom lens of the present application satisfies the following conditional expression (3).
(3) 0.50 <fL1 / f1 <1.00
Here, fL1 is a focal length of the negative meniscus lens of the first lens, and f1 is a focal length of the first lens group.

上記の条件式（３）は、第１レンズ群内の最も物体側に配置された負メニスカスレンズの焦点距離を第１レンズ群の焦点距離で規定した式である。この条件式（３）を満たすことで小型化しつつ収差変動を抑え、像面湾曲、倍率色収差、球面収差を良好に補正することができ、高い結像性能を達成することができる。 The conditional expression (3) is an expression that defines the focal length of the negative meniscus lens disposed closest to the object side in the first lens group by the focal length of the first lens group. Satisfying the conditional expression (3) makes it possible to suppress aberration fluctuations while reducing the size, correct the curvature of field, lateral chromatic aberration, and spherical aberration well, and achieve high imaging performance.

条件式（３）の上限値を超えると、第１レンズ群の焦点距離が小さくなり、第１レンズ群の各レンズの屈折力が大きくなる。このため、変倍による収差の変動が大きくなり、像面湾曲や倍率色収差の十分な補正が困難となるため好ましくない。一方、条件式（３）の下限値を超えた場合、第１レンズ群の変倍時の移動量が大きくなり、本願のズームレンズの全長が大型化してしまうため好ましくない。もしくは十分な画角を確保することができなくなり、このため変倍比を確保することができなくなってしまうので好ましくない。また、歪曲収差の良好な補正が困難となるため好ましくない。 When the upper limit value of conditional expression (3) is exceeded, the focal length of the first lens group becomes small, and the refractive power of each lens of the first lens group becomes large. For this reason, fluctuation of aberration due to zooming becomes large, and it becomes difficult to sufficiently correct curvature of field and lateral chromatic aberration. On the other hand, when the lower limit value of conditional expression (3) is exceeded, the amount of movement of the first lens unit during zooming becomes large, and the overall length of the zoom lens of the present application becomes large, which is not preferable. Alternatively, a sufficient angle of view cannot be ensured, and therefore the zoom ratio cannot be ensured, which is not preferable. Further, it is not preferable because it is difficult to correct distortion.

なお、本願の効果を確実にするために、条件式（３）の上限値を０．９５にすることが好ましい。さらに本願の効果を確実にするために、上限値を０．９０とすることが好ましい。また、本願の効果を確実にするために、条件式（３）の下限値を０．５５にすることが好ましい。さらに本願の効果を確実にするために、下限値を０．６０とすることが好ましい。 In order to secure the effect of the present application, it is preferable to set the upper limit of conditional expression (3) to 0.95. Furthermore, in order to ensure the effect of the present application, the upper limit value is preferably set to 0.90. In order to secure the effect of the present application, it is preferable to set the lower limit of conditional expression (3) to 0.55. Furthermore, in order to ensure the effect of the present application, it is preferable to set the lower limit value to 0.60.

また、本願のズームレンズは、以下の条件式（４）を満足することが望ましい。
（４） −１．００ ≦ (ｒ１Ｒ−ｒ１Ｆ)／(ｒ１Ｒ＋ｒ１Ｆ) ＜ −０．３０
但し、ｒ１Ｆは前記第１レンズ群の前記負メニスカスレンズの物体側のレンズ面の曲率半径、ｒ１Ｒは前記第１レンズ群の前記負メニスカスレンズの像面側のレンズ面の曲率半径である。 Moreover, it is desirable that the zoom lens of the present application satisfies the following conditional expression (4).
(4) −1.00 ≦ (r1R−r1F) / (r1R + r1F) <− 0.30
Here, r1F is the radius of curvature of the object-side lens surface of the negative meniscus lens of the first lens group, and r1R is the radius of curvature of the lens surface of the first lens group on the image plane side of the negative meniscus lens.

条件式（４）は、第１レンズ群内の最も物体側に配置された負メニスカスレンズの形状因子を逆数で規定した条件である。なお、当該負メニスカスレンズの各面に非球面が施されている場合は、近軸曲率半径を用いて条件式（４）の対応値を計算するものとする。この条件式（４）を満たすことで倍率色収差や歪曲収差を良好に補正し、Ｆナンバーを小さくすることができ、高い結像性能を達成することができる。 Conditional expression (4) is a condition in which the shape factor of the negative meniscus lens disposed on the most object side in the first lens group is defined by an inverse number. If each surface of the negative meniscus lens is aspheric, the corresponding value of conditional expression (4) is calculated using the paraxial radius of curvature. By satisfying this conditional expression (4), it is possible to satisfactorily correct lateral chromatic aberration and distortion, reduce the F-number, and achieve high imaging performance.

条件式（４）の上限値を超えると、倍率色収差の補正が困難になるため好ましくない。またズームレンズのＦナンバーが大きくなってしまうため好ましくない。 Exceeding the upper limit of conditional expression (4) is not preferable because it becomes difficult to correct lateral chromatic aberration. Moreover, since the F number of the zoom lens becomes large, it is not preferable.

条件式（４）の下限値を超えると、十分な歪曲収差の補正ができないため好ましくない。 Exceeding the lower limit of conditional expression (4) is not preferable because sufficient distortion cannot be corrected.

なお、本願の効果を確実にするために、条件式（４）の上限値を−０．３５にすることが好ましい。さらに本願の効果を確実にするために、上限値を−０．４０することが好ましい。また、本願の効果を確実にするために、条件式（４）の下限値を−０．８５にすることが好ましい。さらに本願の効果を確実にするために、下限値を−０．７５にすることが好ましい。 In order to secure the effect of the present application, it is preferable to set the upper limit of conditional expression (4) to −0.35. Furthermore, in order to ensure the effect of the present application, it is preferable to set the upper limit value to −0.40. In order to secure the effect of the present application, it is preferable to set the lower limit of conditional expression (4) to −0.85. Furthermore, in order to ensure the effect of the present application, it is preferable to set the lower limit to −0.75.

また、本願のズームレンズは、以下の条件式（５）を満足することが望ましい。
（５）２．０５＜ｎｄＬ１＋０．００９ × νｄＬ１
但し、ｎｄＬ１は前記第１レンズ群の前記負メニスカスレンズのｄ線（波長λ＝587.6nm）に対する屈折率、νｄＬ１は前記第１レンズ群の前記負メニスカスレンズのｄ線（λ＝587.6nm）に対するアッベ数である。 Moreover, it is desirable that the zoom lens of the present application satisfies the following conditional expression (5).
(5) 2.05 <ndL1 + 0.009 × νdL1
Where ndL1 is the refractive index of the negative meniscus lens of the first lens group with respect to the d-line (wavelength λ = 587.6 nm), and νdL1 is the d-line of the negative meniscus lens of the first lens group (λ = 587.6 nm). Abbe number.

条件式（５）は、前記第１レンズ群に含まれる負メニスカスレンズのｄ線（λ＝587.6nm）に対する屈折率とアッベ数を規定するものである。この条件式（５）を満たすことで高次の収差の増大を抑えて、広角端状態での像面湾曲の悪化を防ぐことができ、高い結像性能を達成することができる。 Conditional expression (5) defines the refractive index and Abbe number for the d-line (λ = 587.6 nm) of the negative meniscus lens included in the first lens group. By satisfying this conditional expression (5), it is possible to suppress an increase in high-order aberrations, prevent deterioration of the field curvature in the wide-angle end state, and achieve high imaging performance.

条件式（５）の下限値を超えると、曲率半径が小さくなりすぎて高次の収差が増大するので好ましくない。また、広角端状態での像面湾曲が悪化するため好ましくない。 Exceeding the lower limit of conditional expression (5) is not preferable because the radius of curvature becomes too small and higher-order aberrations increase. Further, it is not preferable because the curvature of field at the wide-angle end state deteriorates.

なお、本願の効果を確実にするために、条件式（５）の下限値を２．１０にすることが好ましい。さらに本願の効果を確実にするために、下限値を２．１５にすることが好ましい。 In order to secure the effect of the present application, it is preferable to set the lower limit of conditional expression (5) to 2.10. Furthermore, in order to ensure the effect of the present application, it is preferable to set the lower limit to 2.15.

また、本願のズームレンズでは、第１接合レンズは、物体側から順に、正レンズと負レンズとの接合で構成されることが望ましい。このように、第１接合レンズを正レンズと負レンズの接合により構成することで球面収差や軸上色収差等の収差を良好に補正することができ、高い結像性能を有する小型のズームレンズを達成することができる。 In the zoom lens of the present application, it is desirable that the first cemented lens is configured by cementing a positive lens and a negative lens in order from the object side. In this way, by configuring the first cemented lens by cementing the positive lens and the negative lens, it is possible to satisfactorily correct spherical aberration, axial chromatic aberration, and other aberrations, and a small zoom lens having high imaging performance. Can be achieved.

また、本願のズームレンズでは、第２接合レンズは、物体側から順に、負レンズと正レンズとの接合で構成されることが望ましい。このように、第２接合レンズを負レンズと正レンズの接合により構成することで球面収差や軸上色収差等の収差を良好に補正することができ、高い結像性能を有する小型のズームレンズを達成することができる。 In the zoom lens of the present application, it is preferable that the second cemented lens is configured by cementing a negative lens and a positive lens in order from the object side. In this way, by constructing the second cemented lens by cementing the negative lens and the positive lens, it is possible to satisfactorily correct aberrations such as spherical aberration and axial chromatic aberration, and a small zoom lens having high imaging performance. Can be achieved.

また、本願のズームレンズは、開口絞りを有し、この開口絞りは第１レンズ群の最も像面側のレンズ面より像面側に配置される構成が望ましい。このような構成により、本願のズームレンズは、コマ収差等の軸外収差を良好に補正して高い結像性能を達成することができる。なお、開口絞りは、第２レンズ群の物体側に配置することがより望ましい。これにより、本願のズームレンズは、コマ収差等の軸外収差をより良好に補正して高い結像性能を達成することができる。 The zoom lens of the present application preferably has an aperture stop, and the aperture stop is preferably arranged on the image plane side with respect to the lens surface closest to the image plane of the first lens group. With such a configuration, the zoom lens of the present application can satisfactorily correct off-axis aberrations such as coma and achieve high imaging performance. It is more desirable to arrange the aperture stop on the object side of the second lens group. Accordingly, the zoom lens of the present application can achieve high imaging performance by better correcting off-axis aberrations such as coma.

また、本願のズームレンズでは、無限遠物体から近距離物体への合焦は、第１レンズ群全体を移動することで行う構成が望ましい。これにより、本願のズームレンズは、小型化を達成することができる。 In the zoom lens of the present application, it is desirable that the focusing from an object at infinity to an object at a short distance is performed by moving the entire first lens group. Thereby, the zoom lens of this application can achieve size reduction.

また、本願のズームレンズでは、第１レンズ群の最も物体側のレンズ面の物体側に、平行平面ガラスを配置することが望ましい。このような構成にすることで、第１レンズ群の最も像面側のレンズ面を埃や汚れから保護することができる。 In the zoom lens of the present application, it is desirable to arrange parallel plane glass on the object side of the lens surface closest to the object side of the first lens group. With such a configuration, the lens surface closest to the image plane of the first lens group can be protected from dust and dirt.

次に、後述する本願の第１実施例に係るズームレンズを備えたカメラを図１１に基づいて説明する。 Next, a camera equipped with a zoom lens according to a first embodiment of the present invention to be described later will be described with reference to FIG.

カメラ１は、図１１に示すように撮影レンズ２として後述する本願の第１実施例に係るズームレンズを備えたレンズ交換式の所謂ミラーレスカメラである。 The camera 1 is a so-called mirrorless camera of an interchangeable lens provided with a zoom lens according to a first embodiment of the present application, which will be described later, as a photographic lens 2 as shown in FIG.

本カメラ１において、不図示の物体（被写体）からの光は、撮影レンズ２で集光されて、撮影レンズ２内のＬＰＦ（Optical low pass filter：光学ローパスフィルタ）を介して撮像部３の撮像面上に被写体像を形成する。そして、撮像部３に設けられた光電変換素子により被写体像が光電変換されて被写体の画像が生成される。この画像は、カメラ１に設けられたＥＶＦ（Electronic view finder：電子ビューファインダ）４に表示される。これにより撮影者は、ＥＶＦ４を介して被写体を観察することができる。 In the camera 1, light from an object (subject) (not shown) is collected by the taking lens 2 and picked up by the image pickup unit 3 through an LPF (Optical low pass filter) in the taking lens 2. A subject image is formed on the surface. Then, the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate an image of the subject. This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1. Thus, the photographer can observe the subject via the EVF 4.

また、撮影者によって不図示のレリーズボタンが押されると、撮像部３により光電変換された画像が不図示のメモリに記憶される。このようにして、撮影者は本カメラ１による被写体の撮影を行うことができる。 Further, when a release button (not shown) is pressed by the photographer, an image photoelectrically converted by the imaging unit 3 is stored in a memory (not shown). In this way, the photographer can shoot the subject with the camera 1.

ここで、本カメラ１に撮影レンズ２として搭載した本願の第１実施例に係るズームレンズは、小型でありながら諸収差を良好に補正した高い結像性能を有するズームレンズである。したがって、本カメラ１は小型化と高い結像性能を実現することができる。なお、後述する第２〜第５実施例に係るズームレンズを撮影レンズ２として搭載したカメラを構成しても上記カメラ１と同様の効果を奏することができる。また、本実施形態では、ミラーレスカメラの例を説明したが、カメラ本体にクイックリターンミラーを有しファインダー光学系により被写体を観察する一眼レフタイプのカメラに後述する各実施例に係るズームレンズを搭載した場合でも、上記カメラ１と同様の効果を奏することができる。 Here, the zoom lens according to the first embodiment of the present application mounted on the camera 1 as the photographing lens 2 is a zoom lens having high imaging performance in which various aberrations are favorably corrected while being small. Therefore, the camera 1 can achieve downsizing and high imaging performance. It should be noted that the same effect as that of the camera 1 can be obtained even if a camera having a zoom lens according to second to fifth embodiments described later is mounted as the photographing lens 2. In this embodiment, an example of a mirrorless camera has been described. However, a zoom lens according to each example described later is provided in a single-lens reflex camera that has a quick return mirror in the camera body and observes a subject with a finder optical system. Even when mounted, the same effects as the camera 1 can be obtained.

次に、本願のズームレンズの製造方法について図１２に基づいて説明する。
図１２に示すズームレンズの製造方法は、物体側より順に、負屈折力の第１レンズ群と、正屈折力の第２レンズ群を有するズームレンズの製造方法であって、以下のステップＳ１〜Ｓ４を含むものである。 Next, a method for manufacturing the zoom lens of the present application will be described with reference to FIG.
The zoom lens manufacturing method shown in FIG. 12 is a zoom lens manufacturing method including a first lens group having negative refractive power and a second lens group having positive refractive power in order from the object side. S4 is included.

（ステップＳ１）
第１レンズ群は、物体側より順に、像面側に凹面を向けた負メニスカスレンズと、負レンズと、物体側に凸面を向けた正レンズを有するようにする。 (Step S1)
The first lens group includes, in order from the object side, a negative meniscus lens having a concave surface facing the image surface side, a negative lens, and a positive lens having a convex surface facing the object side.

（ステップＳ２）
第２レンズ群は、物体側より順に、正レンズと、第１接合レンズと、第２接合レンズを有するようにする。 (Step S2)
The second lens group includes, in order from the object side, a positive lens, a first cemented lens, and a second cemented lens.

（ステップＳ３）
ズームレンズは、以下の条件式（１）、（２）を満足するようにする。
（１）０．５０＜Ｓ１／ｆｗ＜０．８８
（２）０．００＜ (ｒ２Ｆ＋ｒ１Ｒ)／(ｒ２Ｆ−ｒ１Ｒ) ＜２．００
但し、Ｓ１は前記第１レンズ群の、最も物体側のレンズ面から最も像面側のレンズ面までの光軸上の距離、ｆｗは広角端状態における前記ズームレンズの焦点距離、ｒ１Ｒは前記第１レンズ群の前記負メニスカスレンズの像面側のレンズ面の曲率半径、ｒ２Ｆは前記第１レンズ群の前記負レンズの物体側のレンズ面の曲率半径である。 (Step S3)
The zoom lens satisfies the following conditional expressions (1) and (2).
(1) 0.50 <S1 / fw <0.88
(2) 0.00 <(r2F + r1R) / (r2F-r1R) <2.00
Where S1 is the distance on the optical axis from the most object side lens surface to the most image side lens surface of the first lens group, fw is the focal length of the zoom lens in the wide-angle end state, and r1R is the first lens unit. The radius of curvature of the lens surface on the image side of the negative meniscus lens in one lens group, and r2F is the radius of curvature of the lens surface on the object side of the negative lens in the first lens group.

（ステップＳ４）
第１レンズ群と第２レンズ群を鏡筒内に物体側から順に配置し、公知の移動機構を設けることにより、広角端状態から望遠端状態への変倍の際、前記第１レンズ群と前記第２レンズ群との間隔が変化するようにする。 (Step S4)
The first lens group and the second lens group are arranged in order from the object side in the lens barrel, and a known moving mechanism is provided, so that at the time of zooming from the wide-angle end state to the telephoto end state, The distance from the second lens group is changed.

斯かる本願のズームレンズの製造方法によれば、変倍時の収差変動を抑え、広角端状態から望遠端状態にわたって高い結像性能を有する小型のズームレンズを製造することができる。 According to the zoom lens manufacturing method of the present application, it is possible to manufacture a small zoom lens having high imaging performance from the wide-angle end state to the telephoto end state while suppressing aberration fluctuation during zooming.

以下、本願の数値実施例に係るズームレンズを添付図面に基づいて説明する。
（第１実施例）
図１は本願の第１実施例に係るズームレンズのレンズ構成を示す断面図であり、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。 Hereinafter, zoom lenses according to numerical examples of the present application will be described with reference to the accompanying drawings.
(First embodiment)
FIG. 1 is a cross-sectional view showing a lens configuration of a zoom lens according to Example 1 of the present application, in which (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows a telephoto end state. Each is shown.

本実施例に係るズームレンズは、物体側より順に、負屈折力の第１レンズ群Ｇ１と、正屈折力の第２レンズ群Ｇ２とで構成されている。 The zoom lens according to the present exemplary embodiment includes, in order from the object side, a first lens group G1 having a negative refractive power and a second lens group G2 having a positive refractive power.

第１レンズ群Ｇ１は、物体側より順に、物体側に凸面を向けた負メニスカスレンズＬ１と、両凹形状の負レンズＬ２と、物体側に凸面を向けた正メニスカスレンズＬ３とからなる。 The first lens group G1 includes, in order from the object side, a negative meniscus lens L1 having a convex surface facing the object side, a biconcave negative lens L2, and a positive meniscus lens L3 having a convex surface facing the object side.

第２レンズ群Ｇ２は、物体側より順に、両凸形状の正レンズＬ４と、両凸形状の正レンズＬ５と両凹形状の負レンズＬ６との負接合レンズＬ５６と、像面側に凹面を向けた負メニスカスレンズＬ７と両凸形状の正レンズＬ８との正接合レンズＬ７８とからなる。 The second lens group G2, in order from the object side, has a biconvex positive lens L4, a negative cemented lens L56 of a biconvex positive lens L5 and a biconcave negative lens L6, and a concave surface on the image side. And a positive cemented lens L78 of a biconvex positive lens L8.

本実施例に係るズームレンズにおいて、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間には、開口絞りＳが配置されている。第２レンズ群Ｇ２と像面Ｉとの間には、ローパスフィルタＬＰＦが配置されている。ローパスフィルタＬＰＦは、像面Ｉに配設されるＣＣＤ等の固体撮像素子の限界解像以上の空間周波数をカットするためのものである。 In the zoom lens according to the present embodiment, an aperture stop S is disposed between the first lens group G1 and the second lens group G2. A low-pass filter LPF is disposed between the second lens group G2 and the image plane I. The low-pass filter LPF is for cutting a spatial frequency higher than the limit resolution of a solid-state imaging device such as a CCD disposed on the image plane I.

本実施例に係るズームレンズは、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔が変化するように、第１レンズ群Ｇ１と第２レンズ群Ｇ２とを光軸方向へ移動させることにより、広角端状態から望遠端状態への変倍を行う。このとき、開口絞りＳは第２レンズ群Ｇ２とともに光軸方向へ移動し、ローパスフィルタＬＰＦは光軸方向の位置が固定である。 The zoom lens according to the present example moves the first lens group G1 and the second lens group G2 in the optical axis direction so that the air gap between the first lens group G1 and the second lens group G2 changes. Thus, zooming from the wide-angle end state to the telephoto end state is performed. At this time, the aperture stop S moves in the optical axis direction together with the second lens group G2, and the position of the low-pass filter LPF in the optical axis direction is fixed.

本実施例に係るズームレンズは、第１レンズ群Ｇ１全体を合焦レンズ群として光軸方向へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 The zoom lens according to the present embodiment performs focusing from an object at infinity to a near object by moving the first lens group G1 as a focusing lens group in the optical axis direction.

以下の表１に、本実施例に係るズームレンズの諸元の値を掲げる。表１において、ｆは焦点距離、ＢＦはバックフォーカス（最も像面側のレンズ面から像面Ｉまでの光軸上の距離）を示す。[面データ]において、面番号は物体側から数えた光学面の順番、ｒは曲率半径、ｄは面間隔（第n面（nは整数）と第n+1面との間隔）、ｎｄはｄ線（λ＝587.6nm）に対する屈折率、νｄはｄ線（λ＝587.6nm）に対するアッベ数をそれぞれ示している。また、物面は物体面、可変は可変の面間隔、絞りSは開口絞りＳ、像面は像面Ｉをそれぞれ示している。なお、曲率半径ｒ＝∞は平面を示している。また、非球面には面番号に＊を付して曲率半径ｒの欄には近軸曲率半径を示している。 Table 1 below lists values of specifications of the zoom lens according to the present example. In Table 1, f indicates the focal length, and BF indicates the back focus (distance on the optical axis from the lens surface closest to the image plane to the image plane I). In [Surface data], the surface number is the order of the optical surfaces counted from the object side, r is the radius of curvature, d is the surface interval (the interval between the nth surface (n is an integer) and the n + 1th surface), and nd is The refractive index for the d-line (λ = 587.6 nm) and νd indicate the Abbe number for the d-line (λ = 587.6 nm), respectively. In addition, the object plane indicates the object plane, the variable indicates the variable plane spacing, the stop S indicates the aperture stop S, and the image plane indicates the image plane I. The radius of curvature r = ∞ indicates a plane. Further, the aspherical surface is marked with * as the surface number, and the paraxial radius of curvature is shown in the column of the radius of curvature r.

［非球面データ］には、［面データ］に示した非球面について、その形状を次式で表した場合の非球面係数及び円錐定数を示す。
Ｘ（ｙ）＝ｙ^２／［ｒ・｛１＋（１−κ・ｙ^２／ｒ^２）^１／２｝］
＋A4・ｙ^４＋A6・ｙ^６＋A8・ｙ^８＋A10・ｙ^１０ [Aspherical data] shows an aspherical coefficient and a conic constant when the shape of the aspherical surface shown in [Surface data] is expressed by the following equation.
X (y) = y ² / [r · {1+ (1−κ · y ² / r ² ) ^1/2 }]
+ A4 ・ y ⁴ + A6 ・ y ⁶ + A8 ・ y ⁸ + A10 ・ y ¹⁰

ここで、ｙを光軸に垂直な方向の高さ、Ｘ（ｙ）を高さｙにおける非球面の頂点の接平面から当該非球面までの光軸方向に沿った距離（サグ量）、κを円錐定数、A4，A6，A8，A10を非球面係数、ｒを基準球面の曲率半径（近軸曲率半径）とする。なお、「E−n」（nは整数）は「×10^−ｎ」を示し、例えば「1.234E-05」は「1.234×10^−５」を示す。２次の非球面係数A2は０であり、記載を省略している。 Here, y is the height in the direction perpendicular to the optical axis, X (y) is the distance (sag amount) along the optical axis direction from the tangential plane of the apex of the aspheric surface to the aspheric surface at height y, κ Is a conic constant, A4, A6, A8, and A10 are aspheric coefficients, and r is a radius of curvature of the reference sphere (paraxial radius of curvature). “E−n” (n is an integer) indicates “× 10 ⁻ⁿ ”, for example “1.234E-05” indicates “1.234 × 10 ⁻⁵ ”. The secondary aspherical coefficient A2 is 0 and is not shown.

［各種データ］において、ＦＮＯはＦナンバー、２ωは画角（単位は「°」）、Ｙは像高、ＴＬはズームレンズの全長（第１面から像面Ｉまでの光軸上の距離）、空気換算ＴＬはズームレンズの全長の空気換算値、空気換算ＢＦはバックフォーカスの空気換算値、dnは第n面と第n+1面との可変の間隔をそれぞれ示す。なお、Ｗは広角端状態、Ｍは中間焦点距離状態、Ｔは望遠端状態をそれぞれ示す。 In [Various data], FNO is the F number, 2ω is the angle of view (unit is “°”), Y is the image height, TL is the total length of the zoom lens (distance on the optical axis from the first surface to the image surface I). , Air conversion TL is an air conversion value of the entire length of the zoom lens, air conversion BF is an air conversion value of the back focus, and dn is a variable interval between the nth surface and the n + 1th surface. W represents the wide-angle end state, M represents the intermediate focal length state, and T represents the telephoto end state.

ここで、表１に掲載されている焦点距離ｆ、曲率半径ｒ及びその他の長さの単位は一般に「ｍｍ」が使われる。しかしながら光学系は、比例拡大又は比例縮小しても同等の光学性能が得られるため、これに限られるものではない。なお、以上に述べた表１の符号は、後述する各実施例の表においても同様に用いるものとする。 Here, the focal length f, the radius of curvature r, and other length units listed in Table 1 are generally “mm”. However, the optical system is not limited to this because an equivalent optical performance can be obtained even when proportionally enlarged or proportionally reduced. In addition, the code | symbol of Table 1 described above shall be similarly used also in the table | surface of each Example mentioned later.

（表１）第１実施例
[面データ]
面番号ｒｄｎｄ νｄ
物面 ∞
1 21.1989 1.10 1.85135 40.10
＊2 7.5975 4.41 1.00000
3 -52.6643 0.80 1.49782 82.57
4 42.3237 0.84 1.00000
5 15.6071 1.68 1.84666 23.78
6 32.7790 可変 1.00000
7(絞りS) ∞ 0.65 1.00000
8 37.1408 1.47 1.65844 50.84
9 -29.0801 0.10 1.00000
10 9.6037 2.76 1.59319 67.90
11 -14.5302 3.16 1.74400 44.81
12 9.7023 1.83 1.00000
13 31.5814 0.80 1.90265 35.73
14 9.1997 2.75 1.58913 61.22
15 -15.6188 可変 1.00000
16 ∞ 2.79 1.51680 63.88
17 ∞ 2.11 1.00000
像面 ∞

［非球面データ］
面番号 κ A4 A6 A8 A10
2 0.7566 -3.95310E-07 -6.33270E-08 1.17320E-09 -1.39090E-10

［各種データ］
変倍比 2.35

ＷＭＴ
ｆ 11.35 17.00 26.71
ＦＮＯ 3.64 4.38 5.77
２ω 73.6° 51.2° 33.4°
Ｙ 8.00 8.00 8.00
ＴＬ 59.8037 56.6351 59.8037
空気換算ＴＬ 58.8531 55.6845 58.8531
ＢＦ 20.0378 25.5878 35.1214
空気換算ＢＦ 19.0872 24.6372 34.1708

ＷＭＴ
d6 17.4158 8.6974 2.3323
d15 15.1378 20.6878 30.2214

［レンズ群データ］
群始面ｆ
1 1 -17.41
2 8 17.10

［条件式対応値］
（１）Ｓ１／ｆｗ＝ 0.778
（２）（ｒ２Ｆ＋ｒ１Ｒ）／（ｒ２Ｆ−ｒ１Ｒ）＝ 0.748
（３）ｆＬ１／ｆ１＝ 0.830
（４）（ｒ１Ｒ−ｒ１Ｆ）／（ｒ１Ｒ＋ｒ１Ｆ）＝ -0.472
（５）ｎｄＬ１＋０．００９×νｄＬ１＝ 2.212
(Table 1) First Example
[Surface data]
Surface number r d nd νd
Object ∞
1 21.1989 1.10 1.85135 40.10
* 2 7.5975 4.41 1.00000
3 -52.6643 0.80 1.49782 82.57
4 42.3237 0.84 1.00000
5 15.6071 1.68 1.84666 23.78
6 32.7790 Variable 1.00000
7 (Aperture S) ∞ 0.65 1.00000
8 37.1408 1.47 1.65844 50.84
9 -29.0801 0.10 1.00000
10 9.6037 2.76 1.59319 67.90
11 -14.5302 3.16 1.74400 44.81
12 9.7023 1.83 1.00000
13 31.5814 0.80 1.90265 35.73
14 9.1997 2.75 1.58913 61.22
15 -15.6188 Variable 1.00000
16 ∞ 2.79 1.51680 63.88
17 ∞ 2.11 1.00000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
2 0.7566 -3.95310E-07 -6.33270E-08 1.17320E-09 -1.39090E-10

[Various data]
Scaling ratio 2.35

W M T
f 11.35 17.00 26.71
FNO 3.64 4.38 5.77
2ω 73.6 ° 51.2 ° 33.4 °
Y 8.00 8.00 8.00
TL 59.8037 56.6351 59.8037
Air conversion TL 58.8531 55.6845 58.8531
BF 20.0378 25.5878 35.1214
Air conversion BF 19.0872 24.6372 34.1708

W M T
d6 17.4158 8.6974 2.3323
d15 15.1378 20.6878 30.2214

[Lens group data]
Group start surface f
1 1 -17.41
2 8 17.10

[Conditional expression values]
(1) S1 / fw = 0.778
(2) (r2F + r1R) / (r2F-r1R) = 0.748
(3) fL1 / f1 = 0.830
(4) (r1R−r1F) / (r1R + r1F) = − 0.472
(5) ndL1 + 0.009 × νdL1 = 2.212

図２は本願の第１実施例に係るズームレンズの無限遠合焦時の諸収差図を示し、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。 2A and 2B are graphs showing various aberrations of the zoom lens according to the first example of the present application when focused at infinity. FIG. 2A shows a wide-angle end state, FIG. 2B shows an intermediate focal length state, and FIG. 2C shows telephoto. Each end state is shown.

各収差図において、ＦＮＯはＦナンバー、Ｙは像高をそれぞれ示す。球面収差図では最大口径に対応するＦナンバーを示し、非点収差図及び歪曲収差図では像高の最大値を示し、コマ収差図では各像高の値を示す。ｄはｄ線（λ＝587.6nm）、ｇはｇ線（λ＝435.8nm）における収差をそれぞれ示す。非点収差図において、実線はサジタル像面、破線はメリディオナル像面をそれぞれ示す。なお、後述する各実施例の収差図においても、本実施例と同様の符号を用いる。 In each aberration diagram, FNO represents an F number, and Y represents an image height. The spherical aberration diagram shows the F-number corresponding to the maximum aperture, the astigmatism diagram and the distortion diagram show the maximum image height, and the coma diagram shows the value of each image height. d indicates the aberration at the d-line (λ = 587.6 nm), and g indicates the aberration at the g-line (λ = 435.8 nm). In the astigmatism diagram, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane. Note that the same reference numerals as in this embodiment are used in the aberration diagrams of each embodiment described later.

各収差図より、本実施例に係るズームレンズは、広角端状態から望遠端状態にわたって諸収差が良好に補正され、優れた結像性能を有していることがわかる。 From the respective aberration diagrams, it can be seen that the zoom lens according to the present embodiment has excellent imaging performance with various aberrations corrected well from the wide-angle end state to the telephoto end state.

（第２実施例）
図３は本願の第２実施例に係るズームレンズのレンズ構成を示す断面図であり、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。 (Second embodiment)
FIGS. 3A and 3B are sectional views showing the lens configuration of the zoom lens according to Example 2 of the present application, in which FIG. 3A shows the wide-angle end state, FIG. 3B shows the intermediate focal length state, and FIG. 3C shows the telephoto end state. Each is shown.

本実施例に係るズームレンズにおいて、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間には、開口絞りＳが配置されている。第２レンズ群Ｇ２と像面Ｉとの間には、ローパスフィルタＬＰＦが配置されている。 In the zoom lens according to the present embodiment, an aperture stop S is disposed between the first lens group G1 and the second lens group G2. A low-pass filter LPF is disposed between the second lens group G2 and the image plane I.

以下の表２に、本実施例に係るズームレンズの諸元の値を掲げる。
（表２）第２実施例
[面データ]
面番号ｒｄｎｄ νｄ
物面 ∞
1 27.6355 1.10 1.85135 40.10
＊2 7.6407 3.86 1.00000
3 -150.2962 1.00 1.59319 67.90
4 31.0526 0.55 1.00000
5 15.2311 1.93 1.78472 25.64
6 55.6807 可変 1.00000
7(絞りS) ∞ 1.00 1.00000
8 27.1591 1.47 1.69680 55.52
9 -42.3201 0.10 1.00000
10 9.7355 4.49 1.59319 67.90
11 -14.9453 1.00 1.79952 42.09
12 9.9794 2.29 1.00000
13 34.1656 1.00 1.95400 33.46
14 9.1459 2.31 1.65844 50.84
15 -16.2105 可変 1.00000
16 ∞ 2.79 1.51680 63.88
17 ∞ 2.11 1.00000
像面 ∞

［非球面データ］
面番号 κ A4 A6 A8 A10
2 0.7876 -2.07080E-05 -6.78850E-07 6.59940E-09 -3.36460E-10

［各種データ］
変倍比 2.35

ＷＭＴ
ｆ 11.35 17.30 26.70
ＦＮＯ 3.65 4.39 5.77
２ω 75.1° 51.6° 34.3°
Ｙ 8.20 8.20 8.20
ＴＬ 59.6000 56.3856 59.6000
空気換算ＴＬ 58.6494 55.4350 58.6494
ＢＦ 20.2437 26.1597 35.5059
空気換算ＢＦ 19.2931 25.2091 34.5553

ＷＭＴ
d6 17.2621 8.1318 2.0000
d15 15.3437 21.2597 30.6059

［レンズ群データ］
群始面ｆ
1 1 -17.41
2 8 17.31

［条件式対応値］
（１）Ｓ１／ｆｗ＝ 0.743
（２）（ｒ２Ｆ＋ｒ１Ｒ）／（ｒ２Ｆ−ｒ１Ｒ）＝ 0.903
（３）ｆＬ１／ｆ１＝ 0.731
（４）（ｒ１Ｒ−ｒ１Ｆ）／（ｒ１Ｒ＋ｒ１Ｆ）＝ -0.567
（５）ｎｄＬ１＋０．００９×νｄＬ１＝ 2.212
Table 2 below lists values of specifications of the zoom lens according to the present example.
(Table 2) Second Example
[Surface data]
Surface number r d nd νd
Object ∞
1 27.6355 1.10 1.85135 40.10
* 2 7.6407 3.86 1.00000
3 -150.2962 1.00 1.59319 67.90
4 31.0526 0.55 1.00000
5 15.2311 1.93 1.78472 25.64
6 55.6807 Variable 1.00000
7 (Aperture S) ∞ 1.00 1.00000
8 27.1591 1.47 1.69680 55.52
9 -42.3201 0.10 1.00000
10 9.7355 4.49 1.59319 67.90
11 -14.9453 1.00 1.79952 42.09
12 9.9794 2.29 1.00000
13 34.1656 1.00 1.95400 33.46
14 9.1459 2.31 1.65844 50.84
15 -16.2105 Variable 1.00000
16 ∞ 2.79 1.51680 63.88
17 ∞ 2.11 1.00000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
2 0.7876 -2.07080E-05 -6.78850E-07 6.59940E-09 -3.36460E-10

[Various data]
Scaling ratio 2.35

W M T
f 11.35 17.30 26.70
FNO 3.65 4.39 5.77
2ω 75.1 ° 51.6 ° 34.3 °
Y 8.20 8.20 8.20
TL 59.6000 56.3856 59.6000
Air conversion TL 58.6494 55.4350 58.6494
BF 20.2437 26.1597 35.5059
Air conversion BF 19.2931 25.2091 34.5553

W M T
d6 17.2621 8.1318 2.0000
d15 15.3437 21.2597 30.6059

[Lens group data]
Group start surface f
1 1 -17.41
2 8 17.31

[Conditional expression values]
(1) S1 / fw = 0.743
(2) (r2F + r1R) / (r2F-r1R) = 0.903
(3) fL1 / f1 = 0.731
(4) (r1R−r1F) / (r1R + r1F) = − 0.567
(5) ndL1 + 0.009 × νdL1 = 2.212

図４は本願の第２実施例に係るズームレンズの無限遠合焦時の諸収差図を示し、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。 4A and 4B are graphs showing various aberrations of the zoom lens according to the second example of the present application at the time of focusing on infinity. FIG. 4A shows a wide-angle end state, FIG. 4B shows an intermediate focal length state, and FIG. 4C shows telephoto. Each end state is shown.

（第３実施例）
図５は本願の第３実施例に係るズームレンズのレンズ構成を示す断面図であり、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。 (Third embodiment)
FIGS. 5A and 5B are sectional views showing the lens configuration of the zoom lens according to Example 3 of the present application. FIG. 5A shows the wide-angle end state, FIG. 5B shows the intermediate focal length state, and FIG. 5C shows the telephoto end state. Each is shown.

以下の表３に、本実施例に係るズームレンズの諸元の値を掲げる。
（表３）第３実施例
[面データ]
面番号ｒｄｎｄ νｄ
物面 ∞
1 20.9555 1.10 1.85135 40.14
＊2 7.6934 4.31 1.00000
3 -73.1411 0.84 1.49782 82.56
4 25.3734 1.02 1.00000
5 15.7101 1.69 2.00069 25.47
6 31.1165 可変 1.00000
7(絞りS) ∞ 0.65 1.00000
8 40.2590 1.43 1.69680 55.52
9 -31.7401 0.10 1.00000
10 9.8087 3.12 1.59319 67.94
11 -14.5256 2.80 1.74400 44.82
12 10.5639 1.73 1.00000
13 27.6157 1.00 1.95000 29.39
14 8.6732 2.76 1.58267 46.46
15 -15.6920 可変 1.00000
16 ∞ 2.79 1.51680 63.88
17 ∞ 2.11 1.00000
像面 ∞

［非球面データ］
面番号 κ A4 A6 A8 A10
2 0.1520 1.66840E-04 1.76430E-06 -9.16880E-09 3.34540E-10

［各種データ］
変倍比 2.35

ＷＭＴ
ｆ 11.35 17.30 26.70
ＦＮＯ 3.64 4.57 5.80
２ω 75.0° 51.5° 34.2°
Ｙ 8.20 8.20 8.20
ＴＬ 59.8881 56.7244 59.8834
空気換算ＴＬ 58.9375 55.7738 58.9328
ＢＦ 19.9000 25.7174 34.9080
空気換算ＢＦ 18.9494 24.7668 33.9574

ＷＭＴ
d6 17.4426 8.4614 2.4299
d15 15.0000 20.8174 30.0080

［レンズ群データ］
群始面ｆ
1 1 -17.41
2 8 17.02

［条件式対応値］
（１）Ｓ１／ｆｗ＝ 0.789
（２）（ｒ２Ｆ＋ｒ１Ｒ）／（ｒ２Ｆ−ｒ１Ｒ）＝ 0.810
（３）ｆＬ１／ｆ１＝ 0.853
（４）（ｒ１Ｒ−ｒ１Ｆ）／（ｒ１Ｒ＋ｒ１Ｆ）＝ -0.463
（５）ｎｄＬ１＋０．００９×νｄＬ１＝ 2.213
Table 3 below provides values of specifications of the zoom lens according to the present example.
(Table 3) Third Example
[Surface data]
Surface number r d nd νd
Object ∞
1 20.9555 1.10 1.85135 40.14
* 2 7.6934 4.31 1.00000
3 -73.1411 0.84 1.49782 82.56
4 25.3734 1.02 1.00000
5 15.7101 1.69 2.00069 25.47
6 31.1165 Variable 1.00000
7 (Aperture S) ∞ 0.65 1.00000
8 40.2590 1.43 1.69680 55.52
9 -31.7401 0.10 1.00000
10 9.8087 3.12 1.59319 67.94
11 -14.5256 2.80 1.74400 44.82
12 10.5639 1.73 1.00000
13 27.6157 1.00 1.95000 29.39
14 8.6732 2.76 1.58267 46.46
15 -15.6920 Variable 1.00000
16 ∞ 2.79 1.51680 63.88
17 ∞ 2.11 1.00000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
2 0.1520 1.66840E-04 1.76430E-06 -9.16880E-09 3.34540E-10

[Various data]
Scaling ratio 2.35

W M T
f 11.35 17.30 26.70
FNO 3.64 4.57 5.80
2ω 75.0 ° 51.5 ° 34.2 °
Y 8.20 8.20 8.20
TL 59.8881 56.7244 59.8834
Air equivalent TL 58.9375 55.7738 58.9328
BF 19.9000 25.7174 34.9080
Air conversion BF 18.9494 24.7668 33.9574

W M T
d6 17.4426 8.4614 2.4299
d15 15.0000 20.8174 30.0080

[Lens group data]
Group start surface f
1 1 -17.41
2 8 17.02

[Conditional expression values]
(1) S1 / fw = 0.789
(2) (r2F + r1R) / (r2F-r1R) = 0.810
(3) fL1 / f1 = 0.853
(4) (r1R−r1F) / (r1R + r1F) = − 0.463
(5) ndL1 + 0.009 × νdL1 = 2.213

図６は本願の第３実施例に係るズームレンズの無限遠合焦時の諸収差図を示し、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。 6A and 6B show various aberration diagrams of the zoom lens according to the third example of the present application at the time of focusing on infinity. FIG. 6A shows a wide-angle end state, FIG. 6B shows an intermediate focal length state, and FIG. Each end state is shown.

（第４実施例）
図７は本願の第４実施例に係るズームレンズのレンズ構成を示す断面図であり、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。 (Fourth embodiment)
FIG. 7 is a cross-sectional view showing the lens configuration of a zoom lens according to Example 4 of the present application, in which (a) shows the wide-angle end state, (b) shows the intermediate focal length state, and (c) shows the telephoto end state. Each is shown.

本実施例に係るズームレンズにおいて、第１レンズ群Ｇ１の物体側には、平行平面板Ｐが配置されている。この平行平面板Ｐにより、第１レンズ群Ｇ１中の最も物体側のレンズ面の保護等をすることができる。第１レンズ群Ｇ１と第２レンズ群Ｇ２との間には、開口絞りＳが配置されている。第２レンズ群Ｇ２と像面Ｉとの間には、ローパスフィルタＬＰＦが配置されている。 In the zoom lens according to the present embodiment, a plane parallel plate P is disposed on the object side of the first lens group G1. This parallel plane plate P can protect the lens surface closest to the object side in the first lens group G1. An aperture stop S is disposed between the first lens group G1 and the second lens group G2. A low-pass filter LPF is disposed between the second lens group G2 and the image plane I.

本実施例に係るズームレンズは、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔が変化するように、第１レンズ群Ｇ１と第２レンズ群Ｇ２とを光軸方向へ移動させることにより、広角端状態から望遠端状態への変倍を行う。このとき、平行平面板Ｐは第１レンズ群Ｇ１とともに光軸方向へ移動し、開口絞りＳは第２レンズ群Ｇ２とともに光軸方向へ移動し、ローパスフィルタＬＰＦは光軸方向の位置が固定である。 The zoom lens according to the present example moves the first lens group G1 and the second lens group G2 in the optical axis direction so that the air gap between the first lens group G1 and the second lens group G2 changes. Thus, zooming from the wide-angle end state to the telephoto end state is performed. At this time, the plane parallel plate P moves in the optical axis direction together with the first lens group G1, the aperture stop S moves in the optical axis direction together with the second lens group G2, and the low-pass filter LPF has a fixed position in the optical axis direction. is there.

以下の表４に、本実施例に係るズームレンズの諸元の値を掲げる。
（表４）第４実施例
[面データ]
面番号ｒｄｎｄ νｄ
物面 ∞
1 ∞ 1.00 1.51680 63.88
2 ∞ 2.00 1.00000
3 22.1410 1.10 1.85135 40.14
＊4 7.6618 4.23 1.00000
5 -97.7669 0.80 1.49782 82.57
6 29.9606 0.84 1.00000
7 14.8029 1.77 1.84666 23.80
8 30.8037 可変 1.00000
9(絞りS) ∞ 0.65 1.00000
10 35.5510 1.46 1.63854 55.34
11 -30.6717 0.10 1.00000
12 9.6339 2.77 1.59319 67.90
13 -15.0148 3.28 1.74400 44.80
14 9.8040 1.78 1.00000
15 28.6661 1.00 1.90366 31.27
16 8.5586 2.77 1.61772 49.78
17 -17.3121 可変 1.00000
18 ∞ 2.79 1.51680 63.88
19 ∞ 2.11 1.00000
像面 ∞

［非球面データ］
面番号 κ A4 A6 A8 A10
4 0.7721 -7.96219E-06 8.08394E-08 -3.39865E-09 -1.43235E-10

［各種データ］
変倍比 2.35

ＷＭＴ
ｆ 11.35 17.40 26.71
ＦＮＯ 3.63 4.56 5.77
２ω 75.0° 51.4° 34.2°
Ｙ 8.19 8.19 8.19
ＴＬ 59.9000 56.7320 59.9056
空気換算ＴＬ 58.9494 55.7821 58.9493
ＢＦ 19.9000 25.8271 34.9480
空気換算ＢＦ 18.9494 24.8765 33.9974

ＷＭＴ
d8 17.4708 8.37574 2.42841
d17 15.0000 20.92712 30.04804

［レンズ群データ］
群始面ｆ
1 3 -17.41
2 10 17.05

［条件式対応値］
（１）Ｓ１／ｆｗ＝ 0.769
（２）（ｒ２Ｆ＋ｒ１Ｒ）／（ｒ２Ｆ−ｒ１Ｒ）＝ 0.855
（３）ｆＬ１／ｆ１＝ 0.819
（４）（ｒ１Ｒ−ｒ１Ｆ）／（ｒ１Ｒ＋ｒ１Ｆ）＝ -0.486
（５）ｎｄＬ１＋０．００９×νｄＬ１＝ 2.213
Table 4 below lists values of specifications of the zoom lens according to the present example.
(Table 4) Fourth Example
[Surface data]
Surface number r d nd νd
Object ∞
1 ∞ 1.00 1.51680 63.88
2 ∞ 2.00 1.00000
3 22.1410 1.10 1.85135 40.14
* 4 7.6618 4.23 1.00000
5 -97.7669 0.80 1.49782 82.57
6 29.9606 0.84 1.00000
7 14.8029 1.77 1.84666 23.80
8 30.8037 Variable 1.00000
9 (Aperture S) ∞ 0.65 1.00000
10 35.5510 1.46 1.63854 55.34
11 -30.6717 0.10 1.00000
12 9.6339 2.77 1.59319 67.90
13 -15.0148 3.28 1.74400 44.80
14 9.8040 1.78 1.00000
15 28.6661 1.00 1.90366 31.27
16 8.5586 2.77 1.61772 49.78
17 -17.3121 Variable 1.00000
18 ∞ 2.79 1.51680 63.88
19 ∞ 2.11 1.00000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
4 0.7721 -7.96219E-06 8.08394E-08 -3.39865E-09 -1.43235E-10

[Various data]
Scaling ratio 2.35

W M T
f 11.35 17.40 26.71
FNO 3.63 4.56 5.77
2ω 75.0 ° 51.4 ° 34.2 °
Y 8.19 8.19 8.19
TL 59.9000 56.7320 59.9056
Air equivalent TL 58.9494 55.7821 58.9493
BF 19.9000 25.8271 34.9480
Air conversion BF 18.9494 24.8765 33.9974

W M T
d8 17.4708 8.37574 2.42841
d17 15.0000 20.92712 30.04804

[Lens group data]
Group start surface f
1 3 -17.41
2 10 17.05

[Conditional expression values]
(1) S1 / fw = 0.769
(2) (r2F + r1R) / (r2F-r1R) = 0.855
(3) fL1 / f1 = 0.819
(4) (r1R−r1F) / (r1R + r1F) = − 0.486
(5) ndL1 + 0.009 × νdL1 = 2.213

図８は本願の第４実施例に係るズームレンズの無限遠合焦時の諸収差図を示し、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。 FIGS. 8A and 8B show various aberration diagrams of the zoom lens according to Example 4 of the present application at the time of focusing on infinity. FIG. 8A shows a wide-angle end state, FIG. 8B shows an intermediate focal length state, and FIG. Each end state is shown.

（第５実施例）
図９は本願の第５実施例に係るズームレンズのレンズ構成を示す断面図であり、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。 (5th Example)
FIG. 9 is a cross-sectional view showing the lens configuration of a zoom lens according to Example 5 of the present application, in which (a) shows the wide-angle end state, (b) shows the intermediate focal length state, and (c) shows the telephoto end state. Each is shown.

第１レンズ群Ｇ１は、物体側より順に、物体側に凸面を向けた負メニスカスレンズＬ１と、物体側に凸面を向けた負メニスカスレンズＬ２と、物体側に凸面を向けた正メニスカスレンズＬ３とからなる。 The first lens group G1, in order from the object side, includes a negative meniscus lens L1 having a convex surface facing the object side, a negative meniscus lens L2 having a convex surface facing the object side, and a positive meniscus lens L3 having a convex surface facing the object side. Consists of.

以下の表５に、本実施例に係るズームレンズの諸元の値を掲げる。
（表５）第５実施例
[面データ]
面番号ｒｄｎｄ νｄ
物面 ∞
1 21.8349 1.10 1.85135 40.10
＊2 6.9683 3.58 1.00000
3 232.0289 1.00 1.75700 47.73
4 29.0118 0.60 1.00000
5 13.9434 1.92 1.84666 23.78
6 38.9245 可変 1.00000
7(絞りS) ∞ 1.00 1.00000
8 33.9295 1.47 1.67790 55.35
9 -31.2393 0.10 1.00000
10 8.7609 3.86 1.59319 67.90
11 -15.0893 1.00 1.79952 42.09
12 9.7880 2.30 1.00000
13 34.5787 1.00 1.90366 31.27
14 8.1693 2.33 1.61266 44.46
15 -14.8870 可変 1.00000
16 ∞ 2.79 1.51680 63.88
17 ∞ 2.11 1.00000
像面 ∞

［非球面データ］
面番号 κ A4 A6 A8 A10
2 -0.8415 5.64840E-04 -1.28470E-06 3.29740E-08 5.58720E-11

［各種データ］
変倍比 2.35

ＷＭＴ
ｆ 11.35 17.30 26.71
ＦＮＯ 3.59 4.40 5.78
２ω 73.0° 51.0° 34.1°
Ｙ 8.20 8.20 8.20
ＴＬ 58.4836 55.3260 58.4795
空気換算ＴＬ 57.5330 54.3754 57.5289
ＢＦ 20.1001 25.9034 35.0772
空気換算ＢＦ 19.1495 24.3528 34.1266

ＷＭＴ
d6 17.1169 8.1560 2.1357
d15 15.2001 21.0034 30.1772

［レンズ群データ］
群始面ｆ
1 1 -17.41
2 8 16.98

［条件式対応値］
（１）Ｓ１／ｆｗ＝ 0.722
（２）（ｒ２Ｆ＋ｒ１Ｒ）／（ｒ２Ｆ−ｒ１Ｒ）＝ 1.062
（３）ｆＬ１／ｆ１＝ 0.715
（４）（ｒ１Ｒ−ｒ１Ｆ）／（ｒ１Ｒ＋ｒ１Ｆ）＝ -0.516
（５）ｎｄＬ１＋０．００９×νｄＬ１＝ 2.213
Table 5 below provides values of specifications of the zoom lens according to the present example.
(Table 5) Fifth Example
[Surface data]
Surface number r d nd νd
Object ∞
1 21.8349 1.10 1.85135 40.10
* 2 6.9683 3.58 1.00000
3 232.0289 1.00 1.75700 47.73
4 29.0118 0.60 1.00000
5 13.9434 1.92 1.84666 23.78
6 38.9245 Variable 1.00000
7 (Aperture S) ∞ 1.00 1.00000
8 33.9295 1.47 1.67790 55.35
9 -31.2393 0.10 1.00000
10 8.7609 3.86 1.59319 67.90
11 -15.0893 1.00 1.79952 42.09
12 9.7880 2.30 1.00000
13 34.5787 1.00 1.90366 31.27
14 8.1693 2.33 1.61266 44.46
15 -14.8870 Variable 1.00000
16 ∞ 2.79 1.51680 63.88
17 ∞ 2.11 1.00000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
2 -0.8415 5.64840E-04 -1.28470E-06 3.29740E-08 5.58720E-11

[Various data]
Scaling ratio 2.35

W M T
f 11.35 17.30 26.71
FNO 3.59 4.40 5.78
2ω 73.0 ° 51.0 ° 34.1 °
Y 8.20 8.20 8.20
TL 58.4836 55.3260 58.4795
Air conversion TL 57.5330 54.3754 57.5289
BF 20.1001 25.9034 35.0772
Air conversion BF 19.1495 24.3528 34.1266

W M T
d6 17.1169 8.1560 2.1357
d15 15.2001 21.0034 30.1772

[Lens group data]
Group start surface f
1 1 -17.41
2 8 16.98

[Conditional expression values]
(1) S1 / fw = 0.722
(2) (r2F + r1R) / (r2F-r1R) = 1.062
(3) fL1 / f1 = 0.715
(4) (r1R−r1F) / (r1R + r1F) = − 0.516
(5) ndL1 + 0.009 × νdL1 = 2.213

図１０は本願の第５実施例に係るズームレンズの無限遠合焦時の諸収差図を示し、（ａ）は広角端状態を、（ｂ）は中間焦点距離状態を、（ｃ）は望遠端状態をそれぞれ示す。 FIGS. 10A and 10B show various aberration diagrams of the zoom lens according to Example 5 of the present application at the time of focusing on infinity. FIG. 10A shows a wide-angle end state, FIG. 10B shows an intermediate focal length state, and FIG. Each end state is shown.

なお、上記各実施例は本願発明の一具体例を示しているものであり、本願発明はこれらに限定されるものではない。以下の内容は、本願のズームレンズの光学性能を損なわない範囲で適宜採用することが可能である。 In addition, each said Example has shown one specific example of this invention, and this invention is not limited to these. The following contents can be appropriately adopted within a range that does not impair the optical performance of the zoom lens of the present application.

本願のズームレンズの数値実施例として２群構成のものを示したが、本願はこれに限られず、その他の群構成（例えば、３、４群等）のズームレンズを構成することもできる。具体的には、本願のズームレンズの最も物体側や最も像面側にレンズ又はレンズ群を追加した構成でも構わない。レンズ群とは、変倍時に変化する空気間隔で分離された、少なくとも１枚のレンズを有する部分を示す。 Although a numerical example of the zoom lens of the present application is shown as having a two-group configuration, the present application is not limited to this, and a zoom lens of another group configuration (for example, three, four groups, etc.) can be configured. Specifically, a configuration in which a lens or a lens group is added to the most object side or the most image plane side of the zoom lens of the present application may be used. A lens group refers to a portion having at least one lens separated by an air interval that changes during zooming.

また、本願のズームレンズは、無限遠物体から近距離物体への合焦を行うために、レンズ群の一部、１つのレンズ群全体、或いは複数のレンズ群を合焦レンズ群として光軸方向へ移動させる構成としてもよい。特に、第１レンズ群の少なくとも一部を合焦レンズ群とすることが好ましい。また、斯かる合焦レンズ群は、オートフォーカスに適用することも可能であり、オートフォーカス用のモータ、例えば超音波モータ等による駆動にも適している。 In addition, the zoom lens of the present application is used in order to focus from an object at infinity to an object at a short distance in the direction of the optical axis using a part of the lens group, the entire lens group, or a plurality of lens groups as the focusing lens group. It is good also as a structure moved to. In particular, it is preferable that at least a part of the first lens group is a focusing lens group. Such a focusing lens group can also be applied to autofocus, and is also suitable for driving by an autofocus motor, such as an ultrasonic motor.

また、本願のズームレンズにおいて、いずれかのレンズ群全体又はその一部を、防振レンズ群として光軸に対して垂直な方向の成分を含むように移動させ、又は光軸を含む面内方向へ回転移動（揺動）させることにより、手ぶれ等によって生じる像ぶれを補正する構成とすることもできる。特に、本願のズームレンズでは第２レンズ群の少なくとも一部を防振レンズ群とすることが好ましい。 In the zoom lens of the present application, either the entire lens group or a part of the lens group is moved so as to include a component in a direction perpendicular to the optical axis as an anti-vibration lens group, or an in-plane direction including the optical axis It is also possible to adopt a configuration in which image blur caused by camera shake or the like is corrected by rotating (swinging) to the right. In particular, in the zoom lens of the present application, it is preferable that at least a part of the second lens group is an anti-vibration lens group.

また、本願のズームレンズを構成するレンズのレンズ面は、球面又は平面としてもよく、或いは非球面としてもよい。レンズ面が球面又は平面の場合、レンズ加工及び組立調整が容易になり、レンズ加工及び組立調整の誤差による光学性能の劣化を防ぐことができるため好ましい。また、像面がずれた場合でも描写性能の劣化が少ないため好ましい。レンズ面が非球面の場合、研削加工による非球面、ガラスを型で非球面形状に成型したガラスモールド非球面、又はガラス表面に設けた樹脂を非球面形状に形成した複合型非球面のいずれでもよい。また、レンズ面は回折面としてもよく、レンズを屈折率分布型レンズ（ＧＲＩＮレンズ）或いはプラスチックレンズとしてもよい。 The lens surface of the lens constituting the zoom lens of the present application may be a spherical surface, a flat surface, or an aspheric surface. When the lens surface is a spherical surface or a flat surface, it is preferable because lens processing and assembly adjustment are easy, and deterioration of optical performance due to errors in lens processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance. When the lens surface is aspherical, any of aspherical surface by grinding, glass mold aspherical surface in which glass is molded into an aspherical shape, or composite aspherical surface in which resin provided on the glass surface is formed in an aspherical shape Good. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.

また、本願のズームレンズにおいて開口絞りは第１レンズ群と第２レンズ群との間に配置されることが好ましく、開口絞りとして部材を設けずにレンズ枠でその役割を代用する構成としてもよい。 In the zoom lens of the present application, it is preferable that the aperture stop is disposed between the first lens group and the second lens group, and the role may be substituted by a lens frame without providing a member as the aperture stop. .

また、本願のズームレンズを構成するレンズのレンズ面に、広い波長域で高い透過率を有する反射防止膜を施してもよい。これにより、フレアやゴーストを軽減し、高コントラストの高い光学性能を達成することができる。 Further, an antireflection film having a high transmittance in a wide wavelength range may be provided on the lens surface of the lens constituting the zoom lens of the present application. Thereby, flare and ghost can be reduced, and high optical performance with high contrast can be achieved.

また、上記第４実施例に係るズームレンズは、第１レンズ群の物体側に平行平面板を有する例を示しているが、これに限られない。本願のズームレンズは、第１レンズ群の物体側又は第１レンズ群中の最も物体側に、平行平面板又は実質的に屈折力を有しないレンズを有する構成としてもよい。この構成により、第１レンズ群の最も物体側のレンズ面を埃や汚れから保護することができる。 In addition, the zoom lens according to the fourth example has an example in which a plane-parallel plate is provided on the object side of the first lens group, but is not limited thereto. The zoom lens of the present application may be configured to include a plane parallel plate or a lens having substantially no refractive power on the object side of the first lens group or the most object side in the first lens group. With this configuration, the most object side lens surface of the first lens unit can be protected from dust and dirt.

また、本願のズームレンズは、最も像面側に配置されるレンズ成分の像面側のレンズ面から像面までの光軸上の距離（バックフォーカス）が最も小さい状態で、１０．０〜３０．０ｍｍ程度とするのが好ましい。 The zoom lens of the present application is 10.0 to 30 in a state where the distance (back focus) on the optical axis from the lens surface on the image plane side of the lens component arranged closest to the image plane side to the image plane is the smallest. About 0.0 mm is preferable.

また、本願のズームレンズは、像高を５．０〜１２．５ｍｍとするのが好ましく、５．０〜９．５ｍｍとするのがより好ましい。 In the zoom lens of the present application, the image height is preferably 5.0 to 12.5 mm, and more preferably 5.0 to 9.5 mm.

以上述べたように、本願は、小型でありながら諸収差を良好に補正した高い結像性能を有するズームレンズと、これを有する光学装置を提供することができる。 As described above, the present application can provide a zoom lens having a high imaging performance in which various aberrations are favorably corrected while being small, and an optical apparatus having the zoom lens.

Ｇ１第１レンズ群
Ｇ２第２レンズ群
Ｌ１〜Ｌ８レンズ
Ｌ５６第１接合レンズ
Ｌ７８第２接合レンズ
ＬＰＦローパスフィルタ
Ｓ開口絞り
Ｉ像面
１カメラ
２撮影レンズ
３撮像部
４ＥＶＦ G1 First lens group G2 Second lens group L1 to L8 Lens L56 First cemented lens L78 Second cemented lens LPF Low pass filter S Aperture stop I Image plane 1 Camera 2 Shooting lens 3 Imaging unit 4 EVF

Claims

In order from the object side, the first lens group having negative refracting power and the second lens group having positive refracting power substantially consist of two lens groups,
During zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group changes,
The first lens group includes, in order from the object side, a negative meniscus lens having a concave surface facing the image surface side, a negative lens, and a positive lens having a convex surface facing the object side,
The second lens group includes, in order from the object side, a positive lens, a first cemented lens, and a second cemented lens.
The first cemented lens has negative refractive power,
The second cemented lens has a positive refractive power,
A zoom lens satisfying the following conditions:
0.50 <S1 / fw <0.88
0.00 <(r2F + r1R) / (r2F−r1R) ≦ 1.062
However,
S1: Distance on the optical axis from the most object side lens surface to the most image side lens surface of the first lens group fw: Focal length of the zoom lens in the wide-angle end state r1R: of the first lens group Radius of curvature of the lens surface on the image side of the negative meniscus lens r2F: radius of curvature of the lens surface on the object side of the negative lens of the first lens group

In order from the object side, the first lens group having negative refracting power and the second lens group having positive refracting power substantially consist of two lens groups,
During zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group changes,
The first lens group includes, in order from the object side, a negative meniscus lens having a concave surface facing the image surface side, a negative lens, and a positive lens having a convex surface facing the object side,
The second lens group includes, in order from the object side, a positive lens, a first cemented lens, and a second cemented lens.
The first cemented lens has negative refractive power,
A zoom lens satisfying the following conditions:
0.50 <S1 / fw <0.88
0.00 <(r2F + r1R) / (r2F−r1R) ≦ 0.855
However,
S1: Distance on the optical axis from the most object side lens surface to the most image side lens surface of the first lens group fw: Focal length of the zoom lens in the wide-angle end state r1R: of the first lens group Radius of curvature of the lens surface on the image side of the negative meniscus lens r2F: radius of curvature of the lens surface on the object side of the negative lens of the first lens group

In order from the object side, the first lens group having negative refracting power and the second lens group having positive refracting power substantially consist of two lens groups,
During zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group changes,
The first lens group includes, in order from the object side, a negative meniscus lens having a concave surface facing the image surface side, a negative lens, and a positive lens having a convex surface facing the object side,
The second lens group includes, in order from the object side, a positive lens, a first cemented lens, and a second cemented lens.
The second cemented lens is composed of a negative lens and a positive lens in order from the object side,
A zoom lens satisfying the following conditions:
0.50 <S1 / fw <0.88
0.00 <(r2F + r1R) / (r2F-r1R) <2.00
However,
S1: Distance on the optical axis from the most object side lens surface to the most image side lens surface of the first lens group fw: Focal length of the zoom lens in the wide-angle end state r1R: of the first lens group Radius of curvature of the lens surface on the image side of the negative meniscus lens r2F: radius of curvature of the lens surface on the object side of the negative lens of the first lens group

The zoom lens according to claim 3 , wherein the first cemented lens has negative refractive power.

The zoom lens according to claim 3 , wherein the second cemented lens has a positive refractive power.

The zoom lens according to claim 1, any one of 5, characterized in that the following condition is satisfied.
0.50 <fL1 / f1 <1.00
However,
fL1: Focal length of the negative meniscus lens of the first lens f1: Focal length of the first lens group

The zoom lens according to any one of claims 1 to 6, characterized in that the following condition is satisfied.
−1.00 ≦ (r1R−r1F) / (r1R + r1F) <− 0.30
However,
r1F: radius of curvature of the object-side lens surface of the negative meniscus lens of the first lens group r1R: radius of curvature of the lens surface of the first lens group on the image side of the negative meniscus lens

The zoom lens according to any one of claims 1 to 7, characterized in that the following condition is satisfied.
2.05 <ndL1 + 0.009 × νdL1
ndL1: Refractive index of the first lens group with respect to the d-line (λ = 587.6 nm) of the negative meniscus lens νdL1: Abbe number with respect to the d-line (λ = 587.6 nm) of the negative meniscus lens of the first lens group

The zoom lens according to any one of claims 1 to 8 , wherein the first cemented lens includes a positive lens and a negative lens in order from the object side.

Having an aperture stop,
The aperture stop, the zoom lens according to any one of claims 1 9, characterized in that disposed on the image plane side lens surface of the most image side of the first lens group.

Optical device characterized by comprising the zoom lens according to any one of claims 1 to 10.