JP2016156902A

JP2016156902A - Zoom lens, optical device, and method of manufacturing zoom lens

Info

Publication number: JP2016156902A
Application number: JP2015033648A
Authority: JP
Inventors: 鈴木　篤; Atsushi Suzuki; 篤鈴木
Original assignee: Nikon Corp
Current assignee: Nikon Corp
Priority date: 2015-02-24
Filing date: 2015-02-24
Publication date: 2016-09-01
Anticipated expiration: 2035-02-24
Also published as: JP6634683B2

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens having excellent optical performance while highly zooming, an optical device, and a method for manufacturing the zoom lens.SOLUTION: A zoom lens includes, arranged in order from an object side along an optical axis: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; a fourth lens group G4 having negative refractive power; and a fifth lens group G5 having positive refractive power. The zoom lens zooms by changing a distance between each of the lens groups. The first lens group G1 is composed of three or more lenses. The fourth lens group G4 is composed of two or less lenses. The fifth lens group G5 is composed of two or less lenses and moves to an image side when zooming from a wide-angle end state to a telephoto end state. The zoom lens satisfies the following conditional expression (1): 5.80<Dt12/(-f2) ...(1).SELECTED DRAWING: Figure 1

Description

本発明は、ズームレンズ、光学機器及びズームレンズの製造方法に関する。 The present invention relates to a zoom lens, an optical apparatus, and a method for manufacturing a zoom lens.

従来から、光軸に沿って物体側から順に、正の屈折力の第１レンズ群と、負の屈折力の
第２レンズ群と、正の屈折力の第３レンズ群と、負の屈折力の第４レンズ群と、正の屈折
力の第５レンズ群とからなり、各レンズ群を移動させて変倍を行う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, in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative refractive power. There has been proposed a zoom lens that includes a fourth lens group and a fifth lens group having a positive refractive power and performs zooming by moving each lens group (see, for example, Patent Document 1).

特開２０１２−９８６９９号公報JP 2012-98699 A

しかしながら、従来のズームレンズでは、変倍比５０倍前後が限界であり、それ以上の
高変倍では良好な性能を保持することが困難である。 However, with a conventional zoom lens, the zoom ratio is around 50 times, and it is difficult to maintain good performance at higher zoom ratios.

このような課題を解決するため、本発明に係るズームレンズは、光軸に沿って物体側よ
り順に並んだ、正の屈折力を持つ第１レンズ群と、負の屈折力を持つ第２レンズ群と、正
の屈折力を持つ第３レンズ群と、負の屈折力を持つ第４レンズ群と、正の屈折力を持つ第
５レンズ群とを有し、各レンズ群の間隔を変化させて変倍を行い、前記第１レンズ群は、
３枚以上のレンズで構成され、前記第４レンズ群は、２枚以下のレンズで構成され、前記
第５レンズ群は、２枚以下のレンズで構成され、広角端状態から望遠端状態への変倍時に
像面側へ移動し、次の条件式を満足する。 In order to solve such a problem, the zoom lens according to the present invention includes a first lens group having a positive refractive power and a second lens having a negative refractive power, which are arranged in order from the object side along the optical axis. A group, 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, and changing the interval between the lens groups. The first lens group is
The fourth lens group is composed of two or less lenses, and the fifth lens group is composed of two or less lenses, from the wide-angle end state to the telephoto end state. It moves to the image plane side at the time of zooming and satisfies the following conditional expression.

５．８０＜Ｄｔ１２／（−ｆ２）
但し、
Ｄｔ１２：望遠端状態における前記第１レンズ群の像側面から前記第２レンズ群の物体
側面までの光軸上の距離、
ｆ２：前記第２レンズ群の焦点距離。 5.80 <Dt12 / (− f2)
However,
Dt12: distance on the optical axis from the image side surface of the first lens group to the object side surface of the second lens group in the telephoto end state;
f2: focal length of the second lens group.

また、本発明に係るズームレンズは、光軸に沿って物体側より順に並んだ、正の屈折力
を持つ第１レンズ群と、負の屈折力を持つ第２レンズ群と、正の屈折力を持つ第３レンズ
群と、負の屈折力を持つ第４レンズ群と、正の屈折力を持つ第５レンズ群とを有し、各レ
ンズ群の間隔を変化させて変倍を行い、前記第１レンズ群は、３枚以上のレンズで構成さ
れ、前記第４レンズ群は、２枚以下のレンズで構成され、前記第５レンズ群は、２枚以下
のレンズで構成され、広角端状態から望遠端状態への変倍時に像面側へ移動し、次の条件
式を満足する。 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 positive refractive power, which are arranged in order from the object side along the optical axis. A third lens group having a negative refractive power, a fifth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, and changing the distance between the lens groups, The first lens group is composed of three or more lenses, the fourth lens group is composed of two or less lenses, and the fifth lens group is composed of two or less lenses in a wide-angle end state. The zoom lens moves to the image plane side during zooming from the zoom position to the telephoto end, and satisfies the following conditional expression.

０．０１＜Ｄ１／ｆｔ＜０．１５
０．７０＜ Zidwt／Fnwt ＜１．１０
なお、
Zidwt ＝ {(1-βt4^2)*βt5^2}／{(1-βw4^2)*βw5^2}
Fnwt ＝ Fnt／Fnw
と定義する。
但し、
Ｄ１：前記第１レンズ群の物体側面から像側面までの光軸上の距離、
ｆｔ：望遠端状態における全系の焦点距離、
βt4：望遠端状態における前記第４レンズ群の倍率、
βt5：望遠端状態における前記第５レンズ群の倍率、
βw4：広角端状態における前記第４レンズ群の倍率、
βw5：広角端状態における前記第５レンズ群の倍率、
Fnt：望遠端状態におけるＦナンバー、
Fnw：広角端状態におけるＦナンバー。 0.01 <D1 / ft <0.15
0.70 <Zidwt / Fnwt <1.10
In addition,
Zidwt = {(1-βt4 ^ 2) * βt5 ^ 2} / {(1-βw4 ^ 2) * βw5 ^ 2}
Fnwt = Fnt / Fnw
It is defined as
However,
D1: Distance on the optical axis from the object side surface to the image side surface of the first lens group,
ft: focal length of the entire system in the telephoto end state,
βt4: magnification of the fourth lens group in the telephoto end state,
βt5: magnification of the fifth lens group in the telephoto end state,
βw4: magnification of the fourth lens group in the wide-angle end state;
βw5: magnification of the fifth lens group in the wide-angle end state;
Fnt: F number in the telephoto end state,
Fnw: F number in the wide-angle end state.

本発明に係る光学機器は、上述のズームレンズのいずれかを搭載する。 The optical apparatus according to the present invention is equipped with any of the zoom lenses described above.

本発明に係るズームレンズの製造方法は、光軸に沿って物体側より順に並んだ、正の屈
折力を持つ第１レンズ群と、負の屈折力を持つ第２レンズ群と、正の屈折力を持つ第３レ
ンズ群と、負の屈折力を持つ第４レンズ群と、正の屈折力を持つ第５レンズ群とを有し、
各レンズ群の間隔を変化させて変倍を行うズームレンズの製造方法であって、前記第１レ
ンズ群は、３枚以上のレンズで構成され、前記第４レンズ群は、２枚以下のレンズで構成
され、前記第５レンズ群は、２枚以下のレンズで構成され、広角端状態から望遠端状態へ
の変倍時に像面側へ移動し、次の条件式を満足するように、レンズ鏡筒内に各レンズを配
置する。 The zoom lens manufacturing method 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 positive refraction arranged in order from the object side along the optical axis. A third lens group having power, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power,
A zoom lens manufacturing method that performs zooming by changing an interval between each lens group, wherein the first lens group includes three or more lenses, and the fourth lens group includes two or less lenses. The fifth lens group is composed of two or less lenses, and moves to the image plane side upon zooming from the wide-angle end state to the telephoto end state, and satisfies the following conditional expression: Each lens is placed in the lens barrel.

第１実施例に係るズームレンズの構成を示す断面図であり、（Ｗ）は広角端状態、（Ｍ）は中間焦点距離状態、（Ｔ）は望遠端状態における各レンズ群の位置を示す。FIG. 2 is a cross-sectional view illustrating a configuration of a zoom lens according to Example 1, where (W) indicates a wide-angle end state, (M) indicates an intermediate focal length state, and (T) indicates a position of each lens group in a telephoto end state. 第１実施例に係るズームレンズの撮影距離無限遠における諸収差図であり、（ａ）は広角端状態、（ｂ）は中間焦点距離状態、（ｃ）は望遠端状態を示す。FIG. 6 is a diagram illustrating various aberrations of the zoom lens according to Example 1 at an infinite shooting distance, where (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows a telephoto end state. 第２実施例に係るズームレンズの構成を示す断面図であり、（Ｗ）は広角端状態、（Ｍ）は中間焦点距離状態、（Ｔ）は望遠端状態における各レンズ群の位置を示す。FIG. 6 is a cross-sectional view illustrating a configuration of a zoom lens according to Example 2, where (W) indicates a wide-angle end state, (M) indicates an intermediate focal length state, and (T) indicates a position of each lens group in a telephoto end state. 第２実施例に係るズームレンズの撮影距離無限遠における諸収差図であり、（ａ）は広角端状態、（ｂ）は中間焦点距離状態、（ｃ）は望遠端状態を示す。FIG. 6 is a diagram illustrating various aberrations of the zoom lens according to Example 2 at an imaging distance of infinity, where (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows a telephoto end state. 第３実施例に係るズームレンズの構成を示す断面図であり、（Ｗ）は広角端状態、（Ｍ）は中間焦点距離状態、（Ｔ）は望遠端状態における各レンズ群の位置を示す。FIG. 6 is a cross-sectional view illustrating a configuration of a zoom lens according to Example 3, where (W) indicates a wide-angle end state, (M) indicates an intermediate focal length state, and (T) indicates a position of each lens group in a telephoto end state. 第３実施例に係るズームレンズの撮影距離無限遠における諸収差図であり、（ａ）は広角端状態、（ｂ）は中間焦点距離状態、（ｃ）は望遠端状態を示す。FIG. 6 is a diagram illustrating various aberrations of the zoom lens according to Example 3 at an infinite shooting distance, where (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows a telephoto end state. （ａ）はデジタルスチルカメラの正面図であり、（ｂ）はデジタルスチルカメラの背面図である。(A) is a front view of a digital still camera, (b) is a rear view of a digital still camera. 図７（ａ）中の矢印Ａ−Ａ´に沿った断面図である。It is sectional drawing along arrow AA 'in Fig.7 (a). 本実施形態に係るズームレンズの製造方法を示すフローチャートである。5 is a flowchart illustrating a method for manufacturing a zoom lens according to the present embodiment.

以下、実施形態について、図面を参照しながら説明する。本実施形態に係るズームレン
ズＺＬは、図１に示すように、光軸に沿って物体側より順に並んだ、正の屈折力を持つ第
１レンズ群Ｇ１と、負の屈折力を持つ第２レンズ群Ｇ２と、正の屈折力を持つ第３レンズ
群Ｇ３と、負の屈折力を持つ第４レンズ群Ｇ４と、正の屈折力を持つ第５レンズ群Ｇ５と
を有し、各レンズ群の間隔を変化させて変倍を行い、第１レンズ群Ｇ１は、３枚以上のレ
ンズで構成され、第４レンズ群Ｇ４は、２枚以下のレンズで構成され、第５レンズ群Ｇ５
は、２枚以下のレンズで構成され、広角端状態から望遠端状態への変倍時に像面側へ移動
する。この構成により、高変倍化を達成することができる。 Hereinafter, embodiments will be described with reference to the drawings. As shown in FIG. 1, the zoom lens ZL according to the present embodiment includes a first lens group G1 having a positive refractive power and a second lens having a negative refractive power, which are arranged in order from the object side along the optical axis. Each lens group includes a lens group G2, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power. The first lens group G1 is composed of three or more lenses, the fourth lens group G4 is composed of two or less lenses, and the fifth lens group G5.
Is composed of two or less lenses, and moves to the image plane side upon zooming from the wide-angle end state to the telephoto end state. With this configuration, high zooming can be achieved.

本実施形態に係るズームレンズＺＬは、次の条件式（１）を満足する。 The zoom lens ZL according to the present embodiment satisfies the following conditional expression (1).

５．８０＜Ｄｔ１２／（−ｆ２） …（１）
但し、
Ｄｔ１２：望遠端状態における第１レンズ群Ｇ１の像側面から第２レンズ群Ｇ２の物体
側面までの光軸上の距離、
ｆ２：第２レンズ群Ｇ２の焦点距離。 5.80 <Dt12 / (− f2) (1)
However,
Dt12: distance on the optical axis from the image side surface of the first lens group G1 to the object side surface of the second lens group G2 in the telephoto end state;
f2: focal length of the second lens group G2.

条件式（１）は、球面収差、倍率色収差および軸上色収差を小さくし、良好な光学性能
を確保するための条件式である。 Conditional expression (1) is a conditional expression for reducing spherical aberration, lateral chromatic aberration and axial chromatic aberration, and ensuring good optical performance.

条件式（１）の下限値を下回ると、望遠端状態における第１レンズ群Ｇ１と第２レンズ
群Ｇ２との間隔が著しく小さくなるため、第１レンズ群Ｇ１，第２レンズ群Ｇ２の屈折力
が大きくなり過ぎる。第１レンズ群Ｇ１の屈折力が大きくなると、特に、望遠端状態にお
ける球面収差、倍率色収差の補正が困難になる。第２レンズ群Ｇ２の屈折力が大きくなる
と、軸上色収差の補正が困難になる。 If the lower limit value of conditional expression (1) is not reached, the distance between the first lens group G1 and the second lens group G2 in the telephoto end state becomes extremely small, so that the refractive power of the first lens group G1 and the second lens group G2 Becomes too big. When the refractive power of the first lens group G1 is increased, it becomes difficult to correct spherical aberration and lateral chromatic aberration particularly in the telephoto end state. When the refractive power of the second lens group G2 is increased, it is difficult to correct axial chromatic aberration.

本実施形態の効果を確実なものとするために、条件式（１）の下限値を７．５０とする
ことが好ましい。本実施形態の効果をより確実なものとするために、条件式（１）の下限
値を８．４０とすることが好ましい。本実施形態の効果をさらに確実なものとするために
、条件式（１）の下限値を８．９０とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (1) to 7.50. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (1) to 8.40. In order to further secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (1) to 8.90.

本実施形態の効果を確実なものとするために、条件式（１）の上限値を２０．００とす
ることが好ましい。条件式（１）の上限値を下回る場合、球面収差、倍率色収差および軸
上色収差がより小さくなり好ましい。本実施形態の効果を確実なものとするために、条件
式（１）の上限値を１６．００とすることが好ましい。本実施形態の効果をより確実なも
のとするために、条件式（１）の上限値を１３．００とすることが好ましい。 In order to ensure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (1) to 20.00. If the upper limit of conditional expression (1) is not reached, spherical aberration, lateral chromatic aberration and axial chromatic aberration are preferably reduced. In order to ensure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (1) to 16.00. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (1) to 13.00.

本実施形態に係るズームレンズＺＬは、次の条件式（２）を満足することが好ましい。 The zoom lens ZL according to the present embodiment preferably satisfies the following conditional expression (2).

０．０３＜Ｍｖ２／ｆｔ …（２）
但し、
Ｍｖ２：広角端状態から望遠端状態までの第２レンズ群Ｇ２の移動量、
ｆｔ：望遠端状態における全系の焦点距離。 0.03 <Mv2 / ft (2)
However,
Mv2: the amount of movement of the second lens group G2 from the wide-angle end state to the telephoto end state,
ft: focal length of the entire system in the telephoto end state.

条件式（２）は、軸上色収差および倍率色収差を小さくするための条件式である。 Conditional expression (2) is a conditional expression for reducing axial chromatic aberration and lateral chromatic aberration.

条件式（２）の下限値を下回ると、変倍による第２レンズ群Ｇ２の移動量が著しく小さ
くなるため、第２レンズ群Ｇ２の屈折力を大きくする必要があり、変倍による色収差の変
動を抑えることが困難になる。第１レンズ群Ｇ１の移動量を大きくすることで対応可能で
あるが、前玉径が大きくなり、小型化が困難になる。 If the lower limit value of conditional expression (2) is not reached, the amount of movement of the second lens group G2 due to zooming becomes extremely small, so that the refractive power of the second lens group G2 needs to be increased, and fluctuations in chromatic aberration due to zooming. It becomes difficult to suppress. This can be dealt with by increasing the amount of movement of the first lens group G1, but the front lens diameter increases, making it difficult to reduce the size.

本実施形態の効果を確実なものとするために、条件式（２）の下限値を０．０５とする
ことが好ましい。本実施形態の効果をより確実なものとするために、条件式（２）の下限
値を０．０７とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (2) to 0.05. In order to secure the effect of the present embodiment, it is preferable to set the lower limit value of conditional expression (2) to 0.07.

本実施形態に係るズームレンズＺＬは、次の条件式（３）を満足することが好ましい。 The zoom lens ZL according to the present embodiment preferably satisfies the following conditional expression (3).

０．０１＜Ｄ１／ｆｔ＜０．１５ …（３）
但し、
Ｄ１：第１レンズ群Ｇ１の物体側面から像側面までの光軸上の距離、
ｆｔ：望遠端状態における全系の焦点距離。 0.01 <D1 / ft <0.15 (3)
However,
D1: Distance on the optical axis from the object side surface to the image side surface of the first lens group G1,
ft: focal length of the entire system in the telephoto end state.

条件式（３）は、変倍による球面収差および倍率色収差の変動を小さくするための条件
式である。 Conditional expression (3) is a conditional expression for reducing variations in spherical aberration and lateral chromatic aberration due to zooming.

条件式（３）の下限値を下回ると、第１レンズ群Ｇ１の厚さが薄くなりすぎるため、第
１レンズ群Ｇ１の屈折力を確保するために、第１レンズ群Ｇ１内の正レンズの屈折率を大
きくする必要があり、望遠端状態における倍率色収差の補正が困難になる。 If the lower limit value of the conditional expression (3) is not reached, the thickness of the first lens group G1 becomes too thin. Therefore, in order to secure the refractive power of the first lens group G1, the positive lens in the first lens group G1 It is necessary to increase the refractive index, and it becomes difficult to correct lateral chromatic aberration in the telephoto end state.

本実施形態の効果を確実なものとするために、条件式（３）の下限値を０．０３とする
ことが好ましい。本実施形態の効果をより確実なものとするために、条件式（３）の下限
値を０．０５とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (3) to 0.03. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (3) to 0.05.

条件式（３）の上限値を上回ると、第１レンズ群Ｇ１の厚さが大きくなりすぎるため、
広角端状態における光軸からの光線高さが大きくなり、前玉径が大型化する。第２レンズ
群Ｇ２の屈折力を大きくすることである程度は対応可能であるが、変倍による色収差の変
動を抑えることが困難になる。 If the upper limit of conditional expression (3) is exceeded, the thickness of the first lens group G1 becomes too large.
The height of the light beam from the optical axis in the wide-angle end state increases, and the front lens diameter increases. Increasing the refractive power of the second lens group G2 can cope to some extent, but it becomes difficult to suppress fluctuations in chromatic aberration due to zooming.

本実施形態の効果を確実なものとするために、条件式（３）の上限値を０．１０とする
ことが好ましい。本実施形態の効果をより確実なものとするために、条件式（３）の上限
値を０．０７とすることが好ましい。 In order to ensure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (3) to 0.10. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (3) to 0.07.

本実施形態に係るズームレンズＺＬは、次の条件式（４）を満足することが好ましい。 The zoom lens ZL according to this embodiment preferably satisfies the following conditional expression (4).

０．７０＜ Zidwt／Fnwt ＜１．１０ …（４）
なお、
Zidwt ＝ {(1-βt4^2)*βt5^2}／{(1-βw4^2)*βw5^2}
Fnwt ＝ Fnt／Fnw
と定義する。
但し、
βt4：望遠端状態における第４レンズ群Ｇ４の倍率、
βt5：望遠端状態における第５レンズ群Ｇ５の倍率、
βw4：広角端状態における第４レンズ群Ｇ４の倍率、
βw5：広角端状態における第５レンズ群Ｇ５の倍率、
Fnt：望遠端状態におけるＦナンバー、
Fnw：広角端状態におけるＦナンバー。 0.70 <Zidwt / Fnwt <1.10 (4)
In addition,
Zidwt = {(1-βt4 ^ 2) * βt5 ^ 2} / {(1-βw4 ^ 2) * βw5 ^ 2}
Fnwt = Fnt / Fnw
It is defined as
However,
βt4: magnification of the fourth lens group G4 in the telephoto end state,
βt5: magnification of the fifth lens group G5 in the telephoto end state,
βw4: magnification of the fourth lens group G4 in the wide-angle end state;
βw5: magnification of the fifth lens group G5 in the wide-angle end state;
Fnt: F number in the telephoto end state,
Fnw: F number in the wide-angle end state.

条件式（４）は、変倍による球面収差、非点収差および像面湾曲の変動を小さくし、第
４レンズ群Ｇ４で近距離物体への合焦を行う際に、合焦時間を短くするための条件式であ
る。なお、Zidwtは、レンズ群が光軸に沿って移動したときの結像位置の移動量を表す係
数の望遠端状態と広角端状態とにおける比を示す。Fnwtは、Ｆナンバーの望遠端状態と広
角端状態とにおける比を示す。 Conditional expression (4) reduces variations in spherical aberration, astigmatism, and field curvature due to zooming, and shortens the focusing time when focusing on a short-distance object with the fourth lens group G4. Is a conditional expression. Zidwt represents a ratio of a coefficient representing the amount of movement of the imaging position when the lens group moves along the optical axis between the telephoto end state and the wide-angle end state. Fnwt indicates the ratio of the F number between the telephoto end state and the wide-angle end state.

Zidwtの値が相対的に小さくなり、条件式（４）の下限値を下回る場合、望遠端状態に
おける第５レンズ群Ｇ５の倍率が小さくなり過ぎ、強い縮小倍率がかかるため、非点収差
や像面湾曲の変動を抑えることが困難になる。また、Fnwtの値が相対的に大きくなり、条
件式（４）の下限値を下回る場合、広角端状態におけるＦナンバーが小さくなるため、球
面収差の補正が困難になる。 When the value of Zidwt becomes relatively small and falls below the lower limit value of the conditional expression (4), the magnification of the fifth lens group G5 in the telephoto end state becomes too small and a strong reduction magnification is applied. It becomes difficult to suppress fluctuations in surface curvature. Further, when the value of Fnwt becomes relatively large and falls below the lower limit value of the conditional expression (4), the F-number in the wide-angle end state becomes small, so that it is difficult to correct spherical aberration.

本実施形態の効果を確実なものとするために、条件式（４）の下限値を０．８０とする
ことが好ましい。本実施形態の効果をより確実なものとするために、条件式（４）の下限
値を０．９５とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (4) to 0.80. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (4) to 0.95.

Zidwtの値が相対的に大きくなり、条件式（４）の上限値を上回る場合、望遠端状態に
おける第５レンズ群Ｇ５の倍率が大きくなり過ぎ、光学系全体の小型化が困難になる。第
１レンズ群Ｇ１および第２レンズ群Ｇ２の屈折力を強くすることで対応できるが、望遠端
状態における球面収差の補正や、変倍による非点収差や像面湾曲の変動を抑えることが困
難になる。また、Fnwtの値が相対的に小さくなり、条件式（４）の上限値を上回る場合、
望遠端状態におけるＦナンバーが小さくなるため、球面収差の補正が困難になる。 When the value of Zidwt becomes relatively large and exceeds the upper limit value of conditional expression (4), the magnification of the fifth lens group G5 in the telephoto end state becomes too large, and it becomes difficult to reduce the size of the entire optical system. This can be dealt with by increasing the refractive power of the first lens group G1 and the second lens group G2, but it is difficult to correct spherical aberration in the telephoto end state, and to suppress fluctuations in astigmatism and field curvature due to zooming. become. In addition, when the value of Fnwt becomes relatively small and exceeds the upper limit value of the conditional expression (4),
Since the F-number in the telephoto end state is small, it is difficult to correct spherical aberration.

本実施形態の効果を確実なものとするために、条件式（４）の上限値を１．０５とする
ことが好ましい。 In order to ensure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (4) to 1.05.

本実施形態に係るズームレンズＺＬは、次の条件式（５）を満足することが好ましい。 The zoom lens ZL according to this embodiment preferably satisfies the following conditional expression (5).

２．７０＜ βt3／βw3 …（５）
但し、
βt3：望遠端状態における第３レンズ群Ｇ３の倍率、
βw3：広角端状態における第３レンズ群Ｇ３の倍率。 2.70 <βt3 / βw3 (5)
However,
βt3: magnification of the third lens group G3 in the telephoto end state,
βw3: the magnification of the third lens group G3 in the wide-angle end state.

条件式（５）は、変倍による球面収差変動を小さくするための条件式である。 Conditional expression (5) is a conditional expression for reducing the spherical aberration fluctuation due to zooming.

条件式（５）の下限値を下回ると、変倍における第３レンズ群Ｇ３の寄与が小さくなり
過ぎるため、第１レンズ群Ｇ１および第２レンズ群Ｇ２でより多くの変倍作用を担う必要
がある。ここで、光学系の小型化を維持するため、第１レンズ群Ｇ１の屈折力を大きくす
ると、望遠端状態における球面収差や、全変倍域にわたる色収差が悪化する。また、光学
系全体の小型化を維持するため、第２レンズ群Ｇ２の屈折力を大きくすると、望遠端状態
における軸上色収差や、全変倍域にわたる非点収差の補正が困難になる。 If the lower limit value of conditional expression (5) is not reached, the contribution of the third lens group G3 in zooming becomes too small, so that the first lens group G1 and the second lens group G2 need to take more zooming action. is there. Here, when the refractive power of the first lens group G1 is increased in order to maintain the miniaturization of the optical system, spherical aberration in the telephoto end state and chromatic aberration over the entire zoom range are deteriorated. Further, if the refractive power of the second lens group G2 is increased in order to maintain the miniaturization of the entire optical system, it becomes difficult to correct axial chromatic aberration in the telephoto end state and astigmatism over the entire zoom range.

本実施形態の効果を確実なものとするために、条件式（５）の下限値を３．００とする
ことが好ましい。本実施形態の効果をより確実なものとするために、条件式（５）の下限
値を３．５０とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (5) to 3.00. In order to secure the effect of the present embodiment, it is preferable to set the lower limit value of conditional expression (5) to 3.50.

本実施形態の効果を確実なものとするために、条件式（５）の上限値を１０．００とす
ることが好ましい。条件式（５）の上限値を下回る場合、変倍による球面収差変動がより
小さくなり好ましい。本実施形態の効果を確実なものとするために、条件式（５）の上限
値を８．００とすることが好ましい。本実施形態の効果をより確実なものとするために、
条件式（５）の上限値を６．００とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (5) to 10.00. When the value falls below the upper limit value of the conditional expression (5), the spherical aberration fluctuation due to zooming becomes smaller, which is preferable. In order to ensure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (5) to 8.00. In order to ensure the effect of this embodiment,
It is preferable to set the upper limit of conditional expression (5) to 6.00.

本実施形態に係るズームレンズＺＬは、次の条件式（６）を満足することが好ましい。 The zoom lens ZL according to this embodiment preferably satisfies the following conditional expression (6).

８．４０＜ｆ１／（−ｆ２） …（６）
但し、
ｆ１：第１レンズ群Ｇ１の焦点距離。 8.40 <f1 / (− f2) (6)
However,
f1: Focal length of the first lens group G1.

条件式（６）は、球面収差、非点収差および色収差を小さくするための条件式である。 Conditional expression (6) is a conditional expression for reducing spherical aberration, astigmatism, and chromatic aberration.

第１レンズ群Ｇ１の屈折力が相対的に大きくなり過ぎて、条件式（６）の下限値を下回
る場合、小型化には有利だが、望遠端状態における球面収差や倍率色収差の補正が困難に
なる。また、第２レンズ群Ｇ２の屈折力が相対的に小さくなり過ぎて、条件式（６）の下
限値を下回る場合、高い変倍比を確保するためには全長が大型化する。ここで、光学系の
小型化を維持するためには、第１レンズ群Ｇ１の屈折力を大きくしなければならず、望遠
端状態における球面収差が悪化する。 If the refractive power of the first lens group G1 becomes relatively large and falls below the lower limit value of the conditional expression (6), it is advantageous for downsizing, but it is difficult to correct spherical aberration and lateral chromatic aberration in the telephoto end state. Become. Further, when the refractive power of the second lens group G2 becomes relatively small and falls below the lower limit value of the conditional expression (6), the total length is increased in order to ensure a high zoom ratio. Here, in order to maintain the downsizing of the optical system, the refractive power of the first lens group G1 must be increased, and the spherical aberration in the telephoto end state is deteriorated.

本実施形態の効果を確実なものとするために、条件式（６）の下限値を９．００とする
ことが好ましい。本実施形態の効果をより確実なものとするために、条件式（６）の下限
値を１０．００とすることが好ましい。本実施形態の効果をさらに確実なものとするため
に、条件式（６）の下限値を１１．００とすることが好ましい。 In order to ensure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (6) to 9.00. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (6) to 10.00. In order to further secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (6) to 11.00.

本実施形態の効果を確実なものとするために、条件式（６）の上限値を２０．００とす
ることが好ましい。条件式（６）の上限値を下回る場合、球面収差、非点収差および色収
差がより小さくなり好ましい。本実施形態の効果を確実なものとするために、条件式（６
）の上限値を１７．５０とすることが好ましい。本実施形態の効果をより確実なものとす
るために、条件式（６）の上限値を１５．００とすることが好ましい。 In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (6) to 20.00. When falling below the upper limit value of conditional expression (6), spherical aberration, astigmatism and chromatic aberration become smaller, which is preferable. In order to ensure the effect of this embodiment, conditional expression (6
) Is preferably set to 17.50. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (6) to 15.00.

本実施形態に係るズームレンズＺＬは、第４レンズ群Ｇ４が、２枚のレンズで構成され
、これら２枚のレンズは接合されていることが好ましい。この構成により、色収差を効果
的に補正することができる。また、各レンズ面のパワーを小さくすることにより、製造時
の性能低下を抑えることができる。 In the zoom lens ZL according to this embodiment, it is preferable that the fourth lens group G4 includes two lenses, and these two lenses are cemented. With this configuration, chromatic aberration can be effectively corrected. Moreover, the performance degradation at the time of manufacture can be suppressed by making the power of each lens surface small.

本実施形態に係るズームレンズＺＬは、第５レンズ群Ｇ５が、２枚のレンズで構成され
、これら２枚のレンズは接合されていることが好ましい。この構成により、色収差を効果
的に補正することができる。また、各レンズ面のパワーを小さくすることにより、製造時
の性能低下を抑えることができる。 In the zoom lens ZL according to the present embodiment, it is preferable that the fifth lens group G5 includes two lenses, and these two lenses are cemented. With this configuration, chromatic aberration can be effectively corrected. Moreover, the performance degradation at the time of manufacture can be suppressed by making the power of each lens surface small.

本実施形態に係るズームレンズＺＬは、第２レンズ群Ｇ２が、光軸に沿って物体側から
順に並んだ、負レンズと、負レンズと、正レンズと、負レンズとから構成されることが好
ましい。この構成により、全変倍域にわたる非点収差や、望遠端状態における軸上色収差
を効果的に補正することができる。 In the zoom lens ZL according to the present embodiment, the second lens group G2 includes a negative lens, a negative lens, a positive lens, and a negative lens arranged in order from the object side along the optical axis. preferable. With this configuration, it is possible to effectively correct astigmatism over the entire zoom range and axial chromatic aberration in the telephoto end state.

本実施形態に係るズームレンズＺＬは、第３レンズ群Ｇ３が、光軸に沿って像側から順
に並んだ、正レンズと、負レンズと、負レンズと、正レンズとを有することが好ましい。
この構成により、望遠端状態での波長ごとの球面収差とコマ収差を良好なバランスで補正
することができる。 In the zoom lens ZL according to the present embodiment, it is preferable that the third lens group G3 includes a positive lens, a negative lens, a negative lens, and a positive lens arranged in order from the image side along the optical axis.
With this configuration, spherical aberration and coma aberration for each wavelength in the telephoto end state can be corrected with a good balance.

本実施形態に係るズームレンズＺＬは、第４レンズ群Ｇ４を光軸方向に沿って移動させ
ることにより合焦を行うことが好ましい。この構成により、合焦時の性能低下を防ぐこと
ができる。但し、第５レンズ群Ｇ５など、その他の群を用いて合焦を行うことも可能であ
る。 The zoom lens ZL according to the present embodiment preferably performs focusing by moving the fourth lens group G4 along the optical axis direction. With this configuration, it is possible to prevent performance degradation during focusing. However, it is also possible to perform focusing using other groups such as the fifth lens group G5.

以上のような構成を備える本実施形態に係るズームレンズＺＬによれば、高変倍であり
ながら、良好な光学性能を有するズームレンズを実現することができる。 According to the zoom lens ZL according to the present embodiment having the above-described configuration, it is possible to realize a zoom lens having good optical performance while being highly variable.

図７及び図８に、上述のズームレンズＺＬを備える光学機器として、デジタルスチルカ
メラＣＡＭ（光学機器）の構成を示す。このデジタルスチルカメラＣＡＭは、不図示の電
源釦を押すと、撮影レンズ（ズームレンズＺＬ）の不図示のシャッタが開放されて、ズー
ムレンズＺＬで被写体（物体）からの光が集光され、像面Ｉ（図１参照）に配置された撮
像素子Ｃ（例えば、ＣＣＤやＣＭＯＳ等）に結像される。撮像素子Ｃに結像された被写体
像は、デジタルスチルカメラＣＡＭの背後に配置された液晶モニターＭに表示される。撮
影者は、液晶モニターＭを見ながら被写体像の構図を決めた後、レリーズ釦Ｂ１を押し下
げて被写体像を撮像素子Ｃで撮影し、不図示のメモリーに記録保存する。このようにして
、撮影者はカメラＣＡＭによる被写体の撮影を行うことができる。 7 and 8 show the configuration of a digital still camera CAM (optical device) as an optical device including the above-described zoom lens ZL. In this digital still camera CAM, when a power button (not shown) is pressed, a shutter (not shown) of the photographing lens (zoom lens ZL) is opened, and light from the subject (object) is condensed by the zoom lens ZL, and an image is displayed. An image is formed on an image sensor C (for example, a CCD or a CMOS) disposed on the surface I (see FIG. 1). The subject image formed on the image sensor C is displayed on the liquid crystal monitor M disposed behind the digital still camera CAM. The photographer determines the composition of the subject image while looking at the liquid crystal monitor M, and then depresses the release button B1 to photograph the subject image with the image sensor C, and records and saves it in a memory (not shown). In this way, the photographer can shoot the subject with the camera CAM.

カメラＣＡＭには、被写体が暗い場合に補助光を発光する補助光発光部ＥＦ、デジタル
スチルカメラＣＡＭの種々の条件設定等に使用するファンクションボタンＢ２等も配置さ
れている。 The camera CAM is also provided with an auxiliary light emitting unit EF for emitting auxiliary light when the subject is dark, a function button B2 used for setting various conditions of the digital still camera CAM, and the like.

またここでは、カメラＣＡＭとズームレンズＺＬとが一体に成形されたコンパクトタイ
プのカメラを例示したが、光学機器としては、ズームレンズＺＬを有するレンズ鏡筒とカ
メラボディ本体とが着脱可能な一眼レフカメラでも良い。 Further, here, a compact type camera in which the camera CAM and the zoom lens ZL are integrally formed is illustrated. However, as an optical device, a single-lens reflex camera in which a lens barrel having the zoom lens ZL and a camera body main body can be attached and detached. But it ’s okay.

以上のような構成を備える本実施形態に係るカメラＣＡＭによれば、撮影レンズとして
上述のズームレンズＺＬを搭載することにより、高変倍でありながら、良好な光学性能を
有するカメラを実現することができる。 According to the camera CAM according to the present embodiment having the above-described configuration, by mounting the zoom lens ZL described above as a photographing lens, it is possible to realize a camera having high optical performance while having a high zoom ratio. Can do.

続いて、図９を参照しながら、上述のズームレンズＺＬの製造方法について説明する。
まず、鏡筒内に、光軸に沿って物体側より順に並んだ、正の屈折力を持つ第１レンズ群Ｇ
１と、負の屈折力を持つ第２レンズ群Ｇ２と、正の屈折力を持つ第３レンズ群Ｇ３と、負
の屈折力を持つ第４レンズ群Ｇ４と、正の屈折力を持つ第５レンズ群Ｇ５とを有し、各レ
ンズ群の間隔を変化させて変倍を行うように、各レンズを配置する（ステップＳＴ１０）
。第１レンズ群Ｇ１は、３枚以上のレンズで構成されるように、各レンズを鏡筒内に配置
する（ステップＳＴ２０）。第４レンズ群Ｇ４は、２枚以下のレンズで構成されるように
、各レンズを鏡筒内に配置する（ステップＳＴ３０）。第５レンズ群Ｇ５は、２枚以下の
レンズで構成され、広角端状態から望遠端状態への変倍時に像面側へ移動するように、各
レンズを鏡筒内に配置する（ステップＳＴ４０）。次の条件式（１）を満足するように、
各レンズを配置する（ステップＳＴ５０）。 Next, a method for manufacturing the zoom lens ZL will be described with reference to FIG.
First, a first lens group G having a positive refractive power arranged in order from the object side along the optical axis in the lens barrel.
1, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens having a positive refractive power. Each lens is arranged so as to perform zooming by changing the interval between the lens groups (step ST10).
. In the first lens group G1, each lens is arranged in the lens barrel so as to be composed of three or more lenses (step ST20). In the fourth lens group G4, the respective lenses are arranged in the lens barrel so as to be constituted by two or less lenses (step ST30). The fifth lens group G5 is composed of two or less lenses, and each lens is arranged in the lens barrel so as to move to the image plane side upon zooming from the wide-angle end state to the telephoto end state (step ST40). . In order to satisfy the following conditional expression (1),
Each lens is arranged (step ST50).

本実施形態におけるレンズ配置の一例を挙げると、図１に示すように、物体側から順に
、像側に凹面を向けた負メニスカスレンズＬ１１と両凸形状の正レンズＬ１２とからなる
接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１３と、物体側に凸面を向け
た正メニスカスレンズＬ１４とを配置して第１レンズ群Ｇ１とし、像側に凹面を向けた負
メニスカスレンズＬ２１と、両凹形状の負レンズＬ２２と、両凸形状の正レンズＬ２３と
、両凹形状の負レンズＬ２４とを配置して第２レンズ群Ｇ２とし、両凸形状の正レンズＬ
３１と、両凸形状の正レンズＬ３２と、像側に凹面を向けた負メニスカスレンズＬ３３と
、像側に凹面を向けた負メニスカスレンズＬ３４と両凸形状の正レンズＬ３５とからなる
接合レンズとを配置して第３レンズ群Ｇ３とし、両凸形状の正レンズＬ４１と両凹形状の
負レンズＬ４２とからなる接合レンズを配置して第４レンズ群Ｇ４とし、両凸形状の正レ
ンズＬ５１と物体側に凹面を向けた負メニスカスレンズＬ５２とからなる接合レンズを配
置して第５レンズ群Ｇ５とする。このように準備した各レンズ群を、上述の手順で配置し
てズームレンズＺＬを製造する。 As an example of the lens arrangement in the present embodiment, as shown in FIG. 1, in order from the object side, a cemented lens including a negative meniscus lens L11 having a concave surface facing the image side and a biconvex positive lens L12; A positive meniscus lens L13 having a convex surface facing the object side and a positive meniscus lens L14 having a convex surface facing the object side are arranged as a first lens group G1, a negative meniscus lens L21 having a concave surface facing the image side, A concave negative lens L22, a biconvex positive lens L23, and a biconcave negative lens L24 are arranged to form the second lens group G2, and the biconvex positive lens L
31, a cemented lens composed of a biconvex positive lens L32, a negative meniscus lens L33 having a concave surface facing the image side, a negative meniscus lens L34 having a concave surface facing the image side, and a biconvex positive lens L35. Is arranged as a third lens group G3, and a cemented lens composed of a biconvex positive lens L41 and a biconcave negative lens L42 is arranged as a fourth lens group G4, and a biconvex positive lens L51. A cemented lens including a negative meniscus lens L52 having a concave surface directed toward the object side is disposed to form a fifth lens group G5. The zoom lens ZL is manufactured by arranging the lens groups thus prepared in the above-described procedure.

本実施形態に係る製造方法によれば、高変倍でありながら、良好な光学性能を有するズ
ームレンズＺＬを製造することができる。 According to the manufacturing method according to the present embodiment, it is possible to manufacture a zoom lens ZL having good optical performance while having a high zoom ratio.

これより本実施形態に係る各実施例について、図面に基づいて説明する。図１、図３、
図５は、各実施例に係るズームレンズＺＬ（ＺＬ１〜ＺＬ３）の構成及び屈折力配分を示
す断面図である。 Each example according to the present embodiment will be described with reference to the drawings. 1, 3,
FIG. 5 is a cross-sectional view illustrating the configuration and refractive power distribution of the zoom lenses ZL (ZL1 to ZL3) according to each embodiment.

第１実施例に係る図１に対する各参照符号は、参照符号の桁数の増大による説明の煩雑
化を避けるため、実施例ごとに独立して用いている。ゆえに、他の実施例に係る図面と共
通の参照符号を付していても、それらは他の実施例とは必ずしも共通の構成ではない。 Each reference code for FIG. 1 according to the first embodiment is used independently for each embodiment in order to avoid complication of explanation due to an increase in the number of digits of the reference code. Therefore, even if the same reference numerals as those in the drawings according to the other embodiments are given, they are not necessarily in the same configuration as the other embodiments.

また、以下に表１〜表３を示すが、これらは第１実施例〜第３実施例における各諸元の
表である。 Tables 1 to 3 are shown below, but these are tables of specifications in the first to third examples.

各実施例では収差特性の算出対象として、ｄ線（波長587.6nm）、ｇ線（波長435.8nm）
、Ｃ線（波長656.3nm）、Ｆ線（波長486.1nm）を選んでいる。 In each embodiment, aberration characteristics are calculated using d-line (wavelength 587.6 nm) and g-line (wavelength 435.8 nm).
, C line (wavelength 656.3 nm), F line (wavelength 486.1 nm) are selected.

表中の［レンズ諸元］において、面番号は光線の進行する方向に沿った物体側からの光
学面の順序、Ｒは各光学面の曲率半径、Ｄは各光学面から次の光学面（又は像面）までの
光軸上の距離である面間隔、ｎｄは光学部材の材質のｄ線に対する屈折率、νｄは光学部
材の材質のｄ線を基準とするアッベ数をそれぞれ示す。また、（可変）は可変の面間隔、
曲率半径の「∞」は平面又は開口、（絞りＳ）は開口絞りＳ、像面は像面Ｉをそれぞれ示
す。空気の屈折率「1.00000」は省略する。光学面が非球面である場合には、面番号に＊
印を付し、曲率半径Ｒの欄には近軸曲率半径を示す。 In [Lens Specifications] in the table, the surface number is the order of the optical surfaces from the object side along the light traveling direction, R is the radius of curvature of each optical surface, D is the next optical surface from each optical surface ( Or nd is the refractive index of the material of the optical member with respect to the d-line, and νd is the Abbe number based on the d-line of the material of the optical member. Also, (variable) is a variable surface spacing,
The curvature radius “∞” indicates a plane or an aperture, (aperture S) indicates an aperture stop S, and the image plane indicates an image plane I. The refractive index of air “1.00000” is omitted. If the optical surface is aspherical, *
A mark is attached and the paraxial radius of curvature is shown in the column of the radius of curvature R.

表中の［非球面データ］には、［レンズ諸元］に示した非球面について、その形状を次
式（ａ）で示す。Ｘ（ｙ）は非球面の頂点における接平面から高さｙにおける非球面上の
位置までの光軸方向に沿った距離を、Ｒは基準球面の曲率半径（近軸曲率半径）を、κは
円錐定数を、Ａｉは第ｉ次の非球面係数を示す。「Ｅ-n」は、「×１０^-n」を示す。例え
ば、1.234E-05＝1.234×10^-5である。なお、２次の非球面係数Ａ2は０であり、記載を省
略する。 In [Aspherical data] in the table, the shape of the aspherical surface shown in [Lens specifications] is shown by the following equation (a). X (y) is the distance along the optical axis direction from the tangential plane at the apex of the aspheric surface to the position on the aspheric surface at height y, R is the radius of curvature of the reference sphere (paraxial radius of curvature), and κ is Ai represents the i-th aspherical coefficient. “E-n” indicates “× 10 ⁻ⁿ ”. For example, 1.234E-05 = 1.234 × 10 ⁻⁵ . The secondary aspherical coefficient A2 is 0, and the description is omitted.

Ｘ（ｙ）＝（ｙ²／Ｒ）／｛１＋（１−κ×ｙ²／Ｒ²）^1/2｝＋Ａ4×ｙ⁴＋Ａ6×ｙ⁶＋Ａ
8×ｙ⁸＋Ａ10×ｙ¹⁰ …（ａ） X (y) = (y ² / R) / {1+ (1−κ × y ² / R ² ) ^1/2 } + A4 × y ⁴ + A6 × y ⁶ + A
8 × y ⁸ + A10 × y ¹⁰ (a)

表中の［全体諸元］において、ｆはレンズ全系の焦点距離、ＦｎｏはＦナンバー、ωは
半画角（最大入射角、単位：°）、Ｙは像高、Ｂｆは光軸上でのレンズ最終面から近軸像
面までの距離、Ｂｆ（空気）はレンズ最終面から近軸像面までの距離を空気換算長により
表記したもの、ＴＬはレンズ全長（光軸上でのレンズ最前面からレンズ最終面までの距離
にＢｆを加えたもの）、ＴＬ（空気）は光軸上でのレンズ最前面からレンズ最終面までの
距離にＢｆ（空気）を加えたものである。 In [Overall specifications] in the table, f is the focal length of the entire lens system, Fno is the F number, ω is the half field angle (maximum incident angle, unit: °), Y is the image height, and Bf is on the optical axis. The distance from the last lens surface to the paraxial image surface, Bf (air) is the distance from the last lens surface to the paraxial image surface expressed in terms of air, and TL is the total lens length (the lens maximum on the optical axis). TL (air) is obtained by adding Bf (air) to the distance from the lens frontmost surface to the lens final surface on the optical axis.

表中の［可変間隔データ］において、広角端、中間焦点距離、望遠端の各状態における
可変間隔の値Ｄｉを示す。なお、Ｄｉは、第ｉ面と第（ｉ＋１）面の可変間隔を示す。 In [Variable interval data] in the table, the variable interval value Di in each state of the wide-angle end, the intermediate focal length, and the telephoto end is shown. Di represents a variable interval between the i-th surface and the (i + 1) -th surface.

表中の［レンズ群データ］において、各レンズ群の始面と焦点距離を示す。 In [Lens Group Data] in the table, the starting surface and focal length of each lens group are shown.

表中の［条件式］には、上記の条件式（１）〜（６）に対応する値を示す。 [Conditional expression] in the table indicates values corresponding to the conditional expressions (1) to (6).

以下、全ての諸元値において、掲載されている焦点距離ｆ、曲率半径Ｒ、面間隔Ｄ、そ
の他の長さ等は、特記のない場合一般に「mm」が使われるが、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ので、これに限られるものではない。また、単位は
「mm」に限定されることなく、他の適当な単位を用いることが可能である。 Hereinafter, in all the specification values, “mm” is generally used for the focal length f, curvature radius R, surface distance D, and other lengths, etc. unless otherwise specified, but the optical system is proportionally enlarged. Alternatively, the same optical performance can be obtained even by proportional reduction, and the present invention is not limited to this. Further, the unit is not limited to “mm”, and other appropriate units can be used.

ここまでの表の説明は全ての実施例において共通であり、以下での説明を省略する。 The description of the table so far is common to all the embodiments, and the description below is omitted.

（第１実施例）
第１実施例について、図１、図２及び表１を用いて説明する。第１実施例に係るズーム
レンズＺＬ（ＺＬ１）は、図１に示すように、光軸に沿って物体側から順に並んだ、正の
屈折力を持つ第１レンズ群Ｇ１と、負の屈折力を持つ第２レンズ群Ｇ２と、正の屈折力を
持つ第３レンズ群Ｇ３と、負の屈折力を持つ第４レンズ群Ｇ４と、正の屈折力を持つ第５
レンズ群Ｇ５とから構成される。 (First embodiment)
A first embodiment will be described with reference to FIGS. 1 and 2 and Table 1. FIG. As shown in FIG. 1, the zoom lens ZL (ZL1) according to the first example includes a first lens group G1 having a positive refractive power arranged in order from the object side along the optical axis, and a negative refractive power. A second lens group G2 having a positive refractive power, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens having a positive refractive power.
And a lens group G5.

第１レンズ群Ｇ１は、光軸に沿って物体側から順に並んだ、像側に凹面を向けた負メニ
スカスレンズＬ１１と両凸形状の正レンズＬ１２とからなる接合レンズと、物体側に凸面
を向けた正メニスカスレンズＬ１３と、物体側に凸面を向けた正メニスカスレンズＬ１４
とから構成される。 The first lens group G1 includes, in order from the object side along the optical axis, a cemented lens including a negative meniscus lens L11 having a concave surface facing the image side and a biconvex positive lens L12, and a convex surface facing the object side. A positive meniscus lens L13 directed toward the object, and a positive meniscus lens L14 directed convex toward the object side
It consists of.

第２レンズ群Ｇ２は、光軸に沿って物体側から順に並んだ、像側に凹面を向けた負メニ
スカスレンズＬ２１と、両凹形状の負レンズＬ２２と、両凸形状の正レンズＬ２３と、両
凹形状の負レンズＬ２４とから構成される。 The second lens group G2 is arranged in order from the object side along the optical axis, a negative meniscus lens L21 having a concave surface on the image side, a biconcave negative lens L22, a biconvex positive lens L23, It comprises a biconcave negative lens L24.

第３レンズ群Ｇ３は、光軸に沿って物体側から順に並んだ、両凸形状の正レンズＬ３１
と、両凸形状の正レンズＬ３２と、像側に凹面を向けた負メニスカスレンズＬ３３と、像
側に凹面を向けた負メニスカスレンズＬ３４と両凸形状の正レンズＬ３５とからなる接合
レンズとから構成される。 The third lens group G3 is a biconvex positive lens L31 arranged in order from the object side along the optical axis.
And a positive lens L32 having a biconvex shape, a negative meniscus lens L33 having a concave surface facing the image side, a cemented lens including a negative meniscus lens L34 having a concave surface facing the image side and a positive lens L35 having a biconvex shape. Composed.

両凸形状の正レンズＬ３１の両側面は、非球面である。 Both side surfaces of the biconvex positive lens L31 are aspheric.

第４レンズ群Ｇ４は、光軸に沿って物体側から順に並んだ、両凸形状の正レンズＬ４１
と両凹形状の負レンズＬ４２とからなる接合レンズで構成される。 The fourth lens group G4 is a biconvex positive lens L41 arranged in order from the object side along the optical axis.
And a biconcave negative lens L42.

両凸形状の正レンズＬ４１の物体側面は、非球面である。 The object side surface of the biconvex positive lens L41 is aspheric.

第５レンズ群Ｇ５は、光軸に沿って物体側から順に並んだ、両凸形状の正レンズＬ５１
と物体側に凹面を向けた負メニスカスレンズＬ５２とからなる接合レンズで構成される。 The fifth lens group G5 is a biconvex positive lens L51 arranged in order from the object side along the optical axis.
And a negative meniscus lens L52 having a concave surface facing the object side.

両凸形状の正レンズＬ５１の物体側面は、非球面である。 The object side surface of the biconvex positive lens L51 is aspheric.

第３レンズ群Ｇ３の物体側に、光量を調節することを目的とした開口絞りＳが設けられ
ている。 An aperture stop S for adjusting the amount of light is provided on the object side of the third lens group G3.

第５レンズ群Ｇ５の像側に、フィルタＦＬが設けられている。フィルタＦＬは、像面Ｉ
に配設されるＣＣＤ等、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ロ
ーパスフィルタや赤外カットフィルタ等で構成されている。 A filter FL is provided on the image side of the fifth lens group G5. Filter FL is the image plane I
And a low-pass filter, an infrared cut filter, and the like for cutting a spatial frequency higher than the limit resolution of the solid-state imaging device.

本実施例に係るズームレンズＺＬ１は、広角端状態から望遠端状態への変倍に際して、
各レンズ群の間隔が変化するように、第１レンズ群Ｇ１から第５レンズ群Ｇ５までの全て
のレンズ群を移動させる。具体的には、第１レンズ群Ｇ１を、物体側へ移動させる。第２
レンズ群Ｇ２を、一旦像面側へ移動させ、その後物体側へ移動させる。第３レンズ群Ｇ３
を、物体側へ移動させる。第４レンズ群Ｇ４を、一旦像面側へ移動させ、その後物体側へ
移動させる。第５レンズ群Ｇ５を、像面側へ移動させる。開口絞りＳを、第３レンズ群Ｇ
３と一体的に、物体側へ移動させる。 The zoom lens ZL1 according to the present embodiment is used for zooming from the wide-angle end state to the telephoto end state.
All the lens groups from the first lens group G1 to the fifth lens group G5 are moved so that the interval between the lens groups changes. Specifically, the first lens group G1 is moved to the object side. Second
The lens group G2 is once moved to the image plane side and then moved to the object side. Third lens group G3
Is moved to the object side. The fourth lens group G4 is once moved to the image plane side and then moved to the object side. The fifth lens group G5 is moved to the image plane side. The aperture stop S is moved to the third lens group G
3 and move to the object side.

下記の表１に、第１実施例における各諸元の値を示す。表１における面番号１〜３３が
、図１に示すｍ１〜ｍ３３の各光学面に対応している。 Table 1 below shows the values of each item in the first example. Surface numbers 1 to 33 in Table 1 correspond to the optical surfaces m1 to m33 shown in FIG.

（表１）
［レンズ諸元］
面番号ＲＤｎｄ νｄ
物面 ∞
1 1098.9825 1.8000 1.804000 46.5977
2 79.1099 8.8106 1.437001 95.1004
3 -239.9403 0.1000
4 82.2574 6.1989 1.496997 81.6084
5 1523.9054 0.1000
6 89.9100 5.6000 1.496997 81.6084
7 768.6046 D7(可変)
8 107.6966 1.0000 1.834810 42.7334
9 11.6443 5.5064
10 -25.3488 0.7000 1.834810 42.7334
11 92.8811 0.1774
12 24.8647 3.3358 1.922860 20.8804
13 -36.0593 0.9641
14 -18.9977 1.3410 1.834810 42.7334
15 684.6171 D15(可変)
16 ∞ 0.7500 (絞りＳ)
＊17 17.1514 3.0050 1.589130 61.1500
＊18 -67.5172 1.1196
19 20.6602 3.2736 1.496997 81.6084
20 -54.9465 0.1000
21 116.0203 0.6000 1.834000 37.1838
22 14.8071 1.3307
23 2815.9221 0.6000 1.720467 34.7080
24 21.6373 4.3258 1.603000 65.4413
25 -18.9606 D25(可変)
＊26 44.9637 1.8886 1.672700 32.1855
27 -37.2442 0.6000 1.670000 57.3496
28 12.1780 D28(可変)
＊29 17.6808 2.1729 1.618750 63.7334
30 -23.9691 1.0000 1.846663 23.7848
31 -75.0000 D31(可変)
32 ∞ 0.8000 1.516800 63.8807
33 ∞ Bf
像面 ∞

［非球面データ］
面番号 κ A4 A6 A8 A10
17 0.0785 6.8202E-06 9.2770E-08 3.6522E-11 0.0000E+00
18 0.3350 6.7762E-05 2.5527E-08 1.2890E-10 0.0000E+00
26 1.0000 -5.2516E-06 2.2052E-06 -2.8016E-07 1.0265E-08
29 1.0000 1.7725E-06 -1.3037E-06 6.7078E-08 0.0000E+00

［全体諸元］
ズーム比 78.22
広角端中間焦点望遠端
ｆ 4.430 39.000 346.502
Ｆno 2.00257 4.19533 6.60712
ω 42.9497 5.7616 0.6533
Ｂｆ 0.530 0.530 0.530
Ｂｆ(空気) 6.665 2.996 1.557
ＴＬ 132.6704 166.9200 195.1357
ＴＬ(空気) 132.398 166.647 194.863

［可変間隔データ］
可変間隔広角端中間焦点望遠端
D7 0.90176 63.00443 91.08694
D15 58.14079 16.93034 2.02752
D25 5.94269 20.40134 20.00000
D28 4.34707 6.91470 23.79095
D31 5.60788 1.93891 0.50000

［レンズ群データ］
群番号群初面群焦点距離
Ｇ１１ 114.32333
Ｇ２８ -10.09770
Ｇ３ 16 19.86940
Ｇ４ 26 -25.80086
Ｇ５ 29 27.37196

［条件式］
条件式（１）Ｄｔ１２／（−ｆ２）＝ 9.021
条件式（２）Ｍｖ２／ｆｔ＝ 0.080
条件式（３）Ｄ１／ｆｔ＝ 0.065
条件式（４）Zidwt／Fnwt ＝ 0.962
条件式（５）βt3／βw3 ＝ 3.629
条件式（６）ｆ１／（−ｆ２）＝ 11.322 (Table 1)
[Lens specifications]
Surface number R D nd νd
Object ∞
1 1098.9825 1.8000 1.804000 46.5977
2 79.1099 8.8106 1.437001 95.1004
3 -239.9403 0.1000
4 82.2574 6.1989 1.496997 81.6084
5 1523.9054 0.1000
6 89.9100 5.6000 1.496997 81.6084
7 768.6046 D7 (variable)
8 107.6966 1.0000 1.834810 42.7334
9 11.6443 5.5064
10 -25.3488 0.7000 1.834810 42.7334
11 92.8811 0.1774
12 24.8647 3.3358 1.922860 20.8804
13 -36.0593 0.9641
14 -18.9977 1.3410 1.834810 42.7334
15 684.6171 D15 (variable)
16 ∞ 0.7500 (Aperture S)
* 17 17.1514 3.0050 1.589130 61.1500
* 18 -67.5172 1.1196
19 20.6602 3.2736 1.496997 81.6084
20 -54.9465 0.1000
21 116.0203 0.6000 1.834000 37.1838
22 14.8071 1.3307
23 2815.9221 0.6000 1.720467 34.7080
24 21.6373 4.3258 1.603000 65.4413
25 -18.9606 D25 (variable)
* 26 44.9637 1.8886 1.672700 32.1855
27 -37.2442 0.6000 1.670000 57.3496
28 12.1780 D28 (variable)
* 29 17.6808 2.1729 1.618750 63.7334
30 -23.9691 1.0000 1.846663 23.7848
31 -75.0000 D31 (variable)
32 ∞ 0.8000 1.516800 63.8807
33 ∞ Bf
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
17 0.0785 6.8202E-06 9.2770E-08 3.6522E-11 0.0000E + 00
18 0.3350 6.7762E-05 2.5527E-08 1.2890E-10 0.0000E + 00
26 1.0000 -5.2516E-06 2.2052E-06 -2.8016E-07 1.0265E-08
29 1.0000 1.7725E-06 -1.3037E-06 6.7078E-08 0.0000E + 00

[Overall specifications]
Zoom ratio 78.22
Wide angle end Intermediate focus Telephoto end f 4.430 39.000 346.502
Fno 2.00257 4.19533 6.60712
ω 42.9497 5.7616 0.6533
Bf 0.530 0.530 0.530
Bf (Air) 6.665 2.996 1.557
TL 132.6704 166.9200 195.1357
TL (air) 132.398 166.647 194.863

[Variable interval data]
Variable interval Wide-angle end Intermediate focus Telephoto end
D7 0.90176 63.00443 91.08694
D15 58.14079 16.93034 2.02752
D25 5.94269 20.40134 20.00000
D28 4.34707 6.91470 23.79095
D31 5.60788 1.93891 0.50000

[Lens group data]
Group number Group first surface Group focal length G1 1 114.32333
G2 8 -10.09770
G3 16 19.86940
G4 26 -25.80086
G5 29 27.37196

[Conditional expression]
Conditional expression (1) Dt12 / (− f2) = 9.021
Conditional expression (2) Mv2 / ft = 0.080
Conditional expression (3) D1 / ft = 0.065
Conditional expression (4) Zidwt / Fnwt = 0.962
Conditional expression (5) βt3 / βw3 = 3.629
Conditional expression (6) f1 / (-f2) = 11.322

表１から、第１実施例に係るズームレンズＺＬ１は、条件式（１）〜（６）を満足する
ことが分かる。 From Table 1, it can be seen that the zoom lens ZL1 according to Example 1 satisfies the conditional expressions (1) to (6).

図２は、第１実施例に係るズームレンズＺＬ１の撮影距離無限遠における諸収差図（球
面収差図、非点収差図、歪曲収差図、コマ収差図及び倍率色収差図）であり、（ａ）は広
角端状態、（ｂ）は中間焦点距離状態、（ｃ）は望遠端状態をそれぞれ示す。 FIG. 2 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, coma aberration diagram, and chromatic aberration diagram of magnification) at the photographing distance infinity of the zoom lens ZL1 according to the first example. Is the wide-angle end state, (b) is the intermediate focal length state, and (c) is the telephoto end state.

各収差図において、ＦＮＯはＦナンバー、Ａは各像高に対する半画角（単位：°）を示
す。ｄはｄ線、ｇはｇ線、ＣはＣ線、ＦはＦ線における収差を示す。また、これらの記載
がないものは、ｄ線における収差を示す。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 is an F number, and A is a half field angle (unit: °) with respect to each image height. d represents the d-line, g the g-line, C the C-line, and F the F-line aberration. Moreover, those without these descriptions show aberrations at the d-line. 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.

図２に示す各収差図から明らかなように、第１実施例に係るズームレンズＺＬ１は、諸
収差が良好に補正され、優れた結像性能を有することが分かる。 As is apparent from the respective aberration diagrams shown in FIG. 2, it is understood that the zoom lens ZL1 according to the first example has excellent image forming performance with various aberrations corrected well.

（第２実施例）
第２実施例について、図３、図４及び表２を用いて説明する。第２実施例に係るズーム
レンズＺＬ（ＺＬ２）は、図３に示すように、光軸に沿って物体側から順に並んだ、正の
屈折力を持つ第１レンズ群Ｇ１と、負の屈折力を持つ第２レンズ群Ｇ２と、正の屈折力を
持つ第３レンズ群Ｇ３と、負の屈折力を持つ第４レンズ群Ｇ４と、正の屈折力を持つ第５
レンズ群Ｇ５とから構成される。 (Second embodiment)
The second embodiment will be described with reference to FIGS. 3 and 4 and Table 2. FIG. As shown in FIG. 3, the zoom lens ZL (ZL2) according to the second example includes a first lens group G1 having a positive refractive power arranged in order from the object side along the optical axis, and a negative refractive power. A second lens group G2 having a positive refractive power, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens having a positive refractive power.
And a lens group G5.

第３レンズ群Ｇ３は、光軸に沿って物体側から順に並んだ、両凸形状の正レンズＬ３１
と、像側に凹面を向けた負メニスカスレンズＬ３２と、像側に凹面を向けた負メニスカス
レンズＬ３３と両凸形状の正レンズＬ３４とからなる接合レンズとから構成される。 The third lens group G3 is a biconvex positive lens L31 arranged in order from the object side along the optical axis.
And a negative meniscus lens L32 having a concave surface facing the image side, and a cemented lens made up of a negative meniscus lens L33 having a concave surface facing the image side and a biconvex positive lens L34.

本実施例に係るズームレンズＺＬ２は、広角端状態から望遠端状態への変倍に際して、
各レンズ群の間隔が変化するように、第１レンズ群Ｇ１から第５レンズ群Ｇ５までの全て
のレンズ群を移動させる。具体的には、第１レンズ群Ｇ１を、物体側へ移動させる。第２
レンズ群Ｇ２を、像面側へ移動させる。第３レンズ群Ｇ３を、物体側へ移動させる。第４
レンズ群Ｇ４を、物体側へ移動させる。第５レンズ群Ｇ５を、像面側へ移動させる。開口
絞りＳを、第３レンズ群Ｇ３と一体的に、物体側へ移動させる。 The zoom lens ZL2 according to the present embodiment is used for zooming from the wide-angle end state to the telephoto end state.
All the lens groups from the first lens group G1 to the fifth lens group G5 are moved so that the interval between the lens groups changes. Specifically, the first lens group G1 is moved to the object side. Second
The lens group G2 is moved to the image plane side. The third lens group G3 is moved to the object side. 4th
The lens group G4 is moved to the object side. The fifth lens group G5 is moved to the image plane side. The aperture stop S is moved to the object side integrally with the third lens group G3.

下記の表２に、第２実施例における各諸元の値を示す。表２における面番号１〜３１が
、図３に示すｍ１〜ｍ３１の各光学面に対応している。 Table 2 below shows the values of each item in the second embodiment. Surface numbers 1 to 31 in Table 2 correspond to the optical surfaces m1 to m31 shown in FIG.

（表２）
［レンズ諸元］
面番号ＲＤｎｄ νｄ
物面 ∞
1 484.4033 2.3000 1.785900 44.1699
2 85.0000 7.3809 1.437001 95.1004
3 -350.5228 0.1000
4 86.0152 6.2000 1.497820 82.5713
5 6404.7076 0.1000
6 94.9006 5.0000 1.497820 82.5713
7 317.0879 D7(可変)
8 285.0282 1.0000 1.834810 42.7334
9 13.4140 6.1209
10 -28.9721 0.8000 1.834810 42.7334
11 65.6936 0.5807
12 26.2967 2.8915 1.922860 20.8804
13 -49.9285 0.9100
14 -23.5354 0.7000 1.696800 55.5204
15 67.7824 D15(可変)
16 ∞ 0.7500 (絞りＳ)
＊17 12.7205 3.0000 1.553319 71.6846
＊18 -64.8335 2.6500
19 27.1737 1.0000 1.903658 31.3150
20 13.1901 3.0000
21 18.1149 0.5000 1.785900 44.1699
22 11.1100 3.5000 1.497820 82.5713
23 -30.9288 D23(可変)
24 81.6464 2.3146 1.531720 48.7796
25 -53.0701 0.5000 1.497820 82.5713
26 17.0991 D26(可変)
＊27 23.8500 1.9271 1.589130 61.1500
28 -24.7549 0.5000 1.717360 29.5729
29 -65.0000 D29(可変)
30 ∞ 0.7100 1.516800 63.8807
31 ∞ Bf
像面 ∞

［非球面データ］
面番号 κ A4 A6 A8 A10
17 1.0000 -2.3567E-05 -8.3836E-07 2.3372E-08 0.0000E+00
18 1.0000 5.9006E-05 -9.6651E-07 3.2880E-08 -7.9949E-11
27 1.0000 -5.6440E-05 -8.8494E-07 1.2292E-08 0.0000E+00

［全体諸元］
ズーム比 78.22
広角端中間焦点望遠端
ｆ 4.430 39.218 346.505
Ｆno 2.87575 4.65096 6.47791
ω 43.2096 5.7207 0.6537
Ｂｆ 1.300 1.300 1.300
Ｂｆ(空気) 6.524 3.775 2.167
ＴＬ 133.3685 171.8996 199.8660
ＴＬ(空気) 133.127 171.658 199.623

［可変間隔データ］
可変間隔広角端中間焦点望遠端
D7 0.75000 64.61154 96.27731
D15 60.13384 18.41985 1.80999
D23 3.49384 17.87410 20.68068
D26 8.50000 13.25234 24.96239
D29 4.75515 2.00614 0.40000

［レンズ群データ］
群番号群初面群焦点距離
Ｇ１１ 121.16789
Ｇ２８ -10.01637
Ｇ３ 16 21.08324
Ｇ４ 24 -46.26883
Ｇ５ 27 32.98244

［条件式］
条件式（１）Ｄｔ１２／（−ｆ２）＝ 9.612
条件式（２）Ｍｖ２／ｆｔ＝ 0.084
条件式（３）Ｄ１／ｆｔ＝ 0.061
条件式（４）Zidwt／Fnwt ＝ 1.034
条件式（５）βt3／βw3 ＝ 3.941
条件式（６）ｆ１／（−ｆ２）＝ 12.097 (Table 2)
[Lens specifications]
Surface number R D nd νd
Object ∞
1 484.4033 2.3000 1.785900 44.1699
2 85.0000 7.3809 1.437001 95.1004
3 -350.5228 0.1000
4 86.0152 6.2000 1.497820 82.5713
5 6404.7076 0.1000
6 94.9006 5.0000 1.497820 82.5713
7 317.0879 D7 (variable)
8 285.0282 1.0000 1.834810 42.7334
9 13.4140 6.1209
10 -28.9721 0.8000 1.834810 42.7334
11 65.6936 0.5807
12 26.2967 2.8915 1.922860 20.8804
13 -49.9285 0.9100
14 -23.5354 0.7000 1.696800 55.5204
15 67.7824 D15 (variable)
16 ∞ 0.7500 (Aperture S)
* 17 12.7205 3.0000 1.553319 71.6846
* 18 -64.8335 2.6500
19 27.1737 1.0000 1.903658 31.3150
20 13.1901 3.0000
21 18.1149 0.5000 1.785900 44.1699
22 11.1100 3.5000 1.497820 82.5713
23 -30.9288 D23 (variable)
24 81.6464 2.3146 1.531720 48.7796
25 -53.0701 0.5000 1.497820 82.5713
26 17.0991 D26 (variable)
* 27 23.8500 1.9271 1.589130 61.1500
28 -24.7549 0.5000 1.717360 29.5729
29 -65.0000 D29 (variable)
30 ∞ 0.7100 1.516800 63.8807
31 ∞ Bf
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
17 1.0000 -2.3567E-05 -8.3836E-07 2.3372E-08 0.0000E + 00
18 1.0000 5.9006E-05 -9.6651E-07 3.2880E-08 -7.9949E-11
27 1.0000 -5.6440E-05 -8.8494E-07 1.2292E-08 0.0000E + 00

[Overall specifications]
Zoom ratio 78.22
Wide angle end Intermediate focus Telephoto end f 4.430 39.218 346.505
Fno 2.87575 4.65096 6.47791
ω 43.2096 5.7207 0.6537
Bf 1.300 1.300 1.300
Bf (Air) 6.524 3.775 2.167
TL 133.3685 171.8996 199.8660
TL (air) 133.127 171.658 199.623

[Variable interval data]
Variable interval Wide-angle end Intermediate focus Telephoto end
D7 0.75000 64.61154 96.27731
D15 60.13384 18.41985 1.80999
D23 3.49384 17.87410 20.68068
D26 8.50000 13.25234 24.96239
D29 4.75515 2.00614 0.40000

[Lens group data]
Group number Group first surface Group focal length G1 1 121.16789
G2 8 -10.01637
G3 16 21.08324
G4 24 -46.26883
G5 27 32.98244

[Conditional expression]
Conditional expression (1) Dt12 / (− f2) = 9.612
Conditional expression (2) Mv2 / ft = 0.084
Conditional expression (3) D1 / ft = 0.061
Conditional expression (4) Zidwt / Fnwt = 1.034
Conditional expression (5) βt3 / βw3 = 3.941
Conditional expression (6) f1 / (− f2) = 12.097

表２から、第２実施例に係るズームレンズＺＬ２は、条件式（１）〜（６）を満足する
ことが分かる。 From Table 2, it can be seen that the zoom lens ZL2 according to Example 2 satisfies the conditional expressions (1) to (6).

図４は、第２実施例に係るズームレンズＺＬ２の撮影距離無限遠における諸収差図（球
面収差図、非点収差図、歪曲収差図、コマ収差図及び倍率色収差図）であり、（ａ）は広
角端状態、（ｂ）は中間焦点距離状態、（ｃ）は望遠端状態をそれぞれ示す。 FIG. 4 is a diagram showing various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, coma diagram, and chromatic aberration diagram of magnification) at the photographing distance infinity of the zoom lens ZL2 according to the second example. Is the wide-angle end state, (b) is the intermediate focal length state, and (c) is the telephoto end state.

図４に示す各収差図から明らかなように、第２実施例に係るズームレンズＺＬ２は、諸
収差が良好に補正され、優れた結像性能を有することが分かる。 As is apparent from the respective aberration diagrams shown in FIG. 4, it can be seen that the zoom lens ZL2 according to the second example has various image aberrations corrected and has excellent imaging performance.

（第３実施例）
第３実施例について、図５、図６及び表３を用いて説明する。第３実施例に係るズーム
レンズＺＬ（ＺＬ３）は、図５に示すように、光軸に沿って物体側から順に並んだ、正の
屈折力を持つ第１レンズ群Ｇ１と、負の屈折力を持つ第２レンズ群Ｇ２と、正の屈折力を
持つ第３レンズ群Ｇ３と、負の屈折力を持つ第４レンズ群Ｇ４と、正の屈折力を持つ第５
レンズ群Ｇ５とから構成される。 (Third embodiment)
A third embodiment will be described with reference to FIGS. 5 and 6 and Table 3. FIG. As shown in FIG. 5, the zoom lens ZL (ZL3) according to the third example includes a first lens group G1 having a positive refractive power arranged in order from the object side along the optical axis, and a negative refractive power. A second lens group G2 having a positive refractive power, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens having a positive refractive power.
And a lens group G5.

第２レンズ群Ｇ２は、光軸に沿って物体側から順に並んだ、像側に凹面を向けた負メニ
スカスレンズＬ２１と、両凹形状の負レンズＬ２２と両凸形状の正レンズＬ２３とからな
る接合レンズと、物体側に凹面を向けた負メニスカスレンズＬ２４とから構成される。 The second lens group G2 is composed of a negative meniscus lens L21 having a concave surface facing the image side, a biconcave negative lens L22, and a biconvex positive lens L23 arranged in order from the object side along the optical axis. It is composed of a cemented lens and a negative meniscus lens L24 having a concave surface facing the object side.

本実施例に係るズームレンズＺＬ３は、広角端状態から望遠端状態への変倍に際して、
各レンズ群の間隔が変化するように、第１レンズ群Ｇ１から第５レンズ群Ｇ５までの全て
のレンズ群を移動させる。具体的には、第１レンズ群Ｇ１を、物体側へ移動させる。第２
レンズ群Ｇ２を、一旦像面側へ移動させ、その後物体側へ移動させる。第３レンズ群Ｇ３
を、物体側へ移動させる。第４レンズ群Ｇ４を、一旦像面側へ移動させ、その後物体側へ
移動させる。第５レンズ群Ｇ５を、像面側へ移動させる。開口絞りＳを、第３レンズ群Ｇ
３と一体的に、物体側へ移動させる。 The zoom lens ZL3 according to the present embodiment is used for zooming from the wide-angle end state to the telephoto end state.
All the lens groups from the first lens group G1 to the fifth lens group G5 are moved so that the interval between the lens groups changes. Specifically, the first lens group G1 is moved to the object side. Second
The lens group G2 is once moved to the image plane side and then moved to the object side. Third lens group G3
Is moved to the object side. The fourth lens group G4 is once moved to the image plane side and then moved to the object side. The fifth lens group G5 is moved to the image plane side. The aperture stop S is moved to the third lens group G
3 and move to the object side.

下記の表３に、第３実施例における各諸元の値を示す。表３における面番号１〜３０が
、図５に示すｍ１〜ｍ３０の各光学面に対応している。 Table 3 below shows values of various specifications in the third example. Surface numbers 1 to 30 in Table 3 correspond to the optical surfaces m1 to m30 shown in FIG.

（表３）
［レンズ諸元］
面番号ＲＤｎｄ νｄ
物面 ∞
1 684.3944 2.3000 1.785900 44.1699
2 88.5883 7.4292 1.437001 95.1004
3 -286.7900 0.1000
4 87.7854 6.0709 1.497820 82.5713
5 4722.6942 0.1000
6 94.2199 4.7668 1.497820 82.5713
7 336.7415 D7(可変)
8 179.2706 1.0000 1.834810 42.7334
9 14.6897 5.9573
10 -25.1944 0.8000 1.744000 44.8042
11 17.2656 3.4603 1.922860 20.8804
12 -64.8896 1.2728
13 -19.4404 0.7000 1.785900 44.1699
14 -82.5000 D14(可変)
15 ∞ 0.7500 (絞りＳ)
＊16 12.4672 2.6305 1.553319 71.6846
＊17 -59.9456 2.3724
18 25.5702 0.9990 1.903658 31.3150
19 12.0000 3.2000
20 19.0940 0.5000 1.804400 39.6073
21 14.0398 2.8805 1.497820 82.5713
22 -24.1660 D22(可変)
23 93.5777 2.2752 1.531720 48.7796
24 -24.8694 0.5000 1.497820 82.5713
25 14.9217 D25(可変)
＊26 25.2736 1.8147 1.589130 61.1500
27 -27.4400 0.5000 1.805180 25.4483
28 -65.0000 D28(可変)
29 ∞ 0.7100 1.516800 63.8807
30 ∞ Bf
像面 ∞

［非球面データ］
面番号 κ A4 A6 A8 A10
16 1.0000 -3.4837E-05 -3.7395E-07 4.0089E-09 0.0000E+00
17 1.0000 5.8798E-05 -3.9831E-07 5.8745E-09 0.0000E+00
26 1.0000 -1.1977E-04 1.5724E-06 -4.7608E-08 0.0000E+00

［全体諸元］
ズーム比 78.22
広角端中間焦点望遠端
ｆ 4.430 39.179 346.504
Ｆno 3.09863 4.57242 6.84974
ω 43.4725 5.6976 0.6510
Ｂｆ 1.300 1.300 1.300
Ｂｆ(空気) 5.375 4.055 2.168
ＴＬ 134.7637 168.1698 200.0000
ＴＬ(空気) 134.522 167.928 199.758

［可変間隔データ］
可変間隔広角端中間焦点望遠端
D7 0.80000 65.29820 96.41213
D14 61.58986 16.55966 1.75000
D22 2.80178 17.33563 19.59710
D25 11.57540 12.30000 27.45116
D28 3.60706 2.28669 0.40000

［レンズ群データ］
群番号群初面群焦点距離
Ｇ１１ 121.53230
Ｇ２８ -9.68967
Ｇ３ 15 19.81666
Ｇ４ 23 -38.50803
Ｇ５ 26 36.16627

［条件式］
条件式（１）Ｄｔ１２／（−ｆ２）＝ 9.950
条件式（２）Ｍｖ２／ｆｔ＝ 0.088
条件式（３）Ｄ１／ｆｔ＝ 0.060
条件式（４）Zidwt／Fnwt ＝ 0.994
条件式（５）βt3／βw3 ＝ 4.374
条件式（６）ｆ１／（−ｆ２）＝ 12.542 (Table 3)
[Lens specifications]
Surface number R D nd νd
Object ∞
1 684.3944 2.3000 1.785900 44.1699
2 88.5883 7.4292 1.437001 95.1004
3 -286.7900 0.1000
4 87.7854 6.0709 1.497820 82.5713
5 4722.6942 0.1000
6 94.2199 4.7668 1.497820 82.5713
7 336.7415 D7 (variable)
8 179.2706 1.0000 1.834810 42.7334
9 14.6897 5.9573
10 -25.1944 0.8000 1.744000 44.8042
11 17.2656 3.4603 1.922860 20.8804
12 -64.8896 1.2728
13 -19.4404 0.7000 1.785900 44.1699
14 -82.5000 D14 (variable)
15 ∞ 0.7500 (Aperture S)
* 16 12.4672 2.6305 1.553319 71.6846
* 17 -59.9456 2.3724
18 25.5702 0.9990 1.903658 31.3150
19 12.0000 3.2000
20 19.0940 0.5000 1.804400 39.6073
21 14.0398 2.8805 1.497820 82.5713
22 -24.1660 D22 (variable)
23 93.5777 2.2752 1.531720 48.7796
24 -24.8694 0.5000 1.497820 82.5713
25 14.9217 D25 (variable)
* 26 25.2736 1.8147 1.589130 61.1500
27 -27.4400 0.5000 1.805180 25.4483
28 -65.0000 D28 (variable)
29 ∞ 0.7100 1.516800 63.8807
30 ∞ Bf
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
16 1.0000 -3.4837E-05 -3.7395E-07 4.0089E-09 0.0000E + 00
17 1.0000 5.8798E-05 -3.9831E-07 5.8745E-09 0.0000E + 00
26 1.0000 -1.1977E-04 1.5724E-06 -4.7608E-08 0.0000E + 00

[Overall specifications]
Zoom ratio 78.22
Wide angle end Intermediate focus Telephoto end f 4.430 39.179 346.504
Fno 3.09863 4.57242 6.84974
ω 43.4725 5.6976 0.6510
Bf 1.300 1.300 1.300
Bf (Air) 5.375 4.055 2.168
TL 134.7637 168.1698 200.0000
TL (air) 134.522 167.928 199.758

[Variable interval data]
Variable interval Wide-angle end Intermediate focus Telephoto end
D7 0.80000 65.29820 96.41213
D14 61.58986 16.55966 1.75000
D22 2.80178 17.33563 19.59710
D25 11.57540 12.30000 27.45116
D28 3.60706 2.28669 0.40000

[Lens group data]
Group number Group first surface Group focal length G1 1 121.53230
G2 8 -9.68967
G3 15 19.81666
G4 23 -38.50803
G5 26 36.16627

[Conditional expression]
Conditional expression (1) Dt12 / (-f2) = 9.950
Conditional expression (2) Mv2 / ft = 0.088
Conditional expression (3) D1 / ft = 0.060
Conditional expression (4) Zidwt / Fnwt = 0.994
Conditional expression (5) βt3 / βw3 = 4.374
Conditional expression (6) f1 / (-f2) = 12.542

表３から、第３実施例に係るズームレンズＺＬ３は、条件式（１）〜（６）を満足する
ことが分かる。 From Table 3, it can be seen that the zoom lens ZL3 according to Example 3 satisfies the conditional expressions (1) to (6).

図６は、第３実施例に係るズームレンズＺＬ３の撮影距離無限遠における諸収差図（球
面収差図、非点収差図、歪曲収差図、コマ収差図及び倍率色収差図）であり、（ａ）は広
角端状態、（ｂ）は中間焦点距離状態、（ｃ）は望遠端状態をそれぞれ示す。 FIG. 6 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, coma diagram, and chromatic aberration diagram of magnification) at the photographing distance infinity of the zoom lens ZL3 according to Example 3, and (a) Is the wide-angle end state, (b) is the intermediate focal length state, and (c) is the telephoto end state.

図６に示す各収差図から明らかなように、第３実施例に係るズームレンズＺＬ３は、諸
収差が良好に補正され、優れた結像性能を有することが分かる。 As is apparent from the respective aberration diagrams shown in FIG. 6, it can be seen that the zoom lens ZL3 according to the third example has various image aberrations corrected and has excellent imaging performance.

ここまで本発明を分かりやすくするために、実施形態の構成要件を付して説明したが、
本発明がこれに限定されるものではないことは言うまでもない。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 order to make the present invention easy to understand so far, the configuration requirements of the embodiment have been described.
It goes without saying that the present invention is not limited to this. 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.

本実施形態に係るズームレンズＺＬの数値実施例として、５群構成のものを示したが、
これに限定されず、他の群構成（例えば、６群等）にも適用可能である。具体的には、最
も物体側にレンズまたはレンズ群を追加した構成や、最も像側にレンズまたはレンズ群を
追加した構成でも構わない。また、レンズ群とは、変倍時または合焦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。 As a numerical example of the zoom lens ZL according to this embodiment, a five-group configuration is shown.
The present invention is not limited to this, and can be applied to other group configurations (for example, six groups). Specifically, a configuration in which a lens or a lens group is added closest to the object side or a configuration in which a lens or a lens group is added closest to the image side may be used. The lens group indicates a portion having at least one lens separated by an air interval that changes at the time of zooming or focusing.

本実施形態に係るズームレンズＺＬにおいて、無限遠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。この合焦レンズ群は、オートフォーカスに
も適用することができ、オートフォーカス用の（超音波モーター等を用いた）モーター駆
動にも適している。特に、第４レンズ群Ｇ４、または第５レンズ群Ｇ５を合焦レンズ群と
することが好ましい。また、第４レンズ群Ｇ４と第５レンズ群Ｇ５とを同時に動かして合
焦を行うことも可能である。 In the zoom lens ZL according to the present embodiment, in order to focus from infinity to a short distance object, a part of the lens group, one entire lens group, or a plurality of lens groups is used as the focusing lens group, and the optical axis It is good also as a structure moved to a direction. This focusing lens group can be applied to autofocus, and is also suitable for driving a motor for autofocus (using an ultrasonic motor or the like). In particular, the fourth lens group G4 or the fifth lens group G5 is preferably a focusing lens group. It is also possible to focus by moving the fourth lens group G4 and the fifth lens group G5 simultaneously.

本実施形態に係るズームレンズＺＬにおいて、いずれかのレンズ群全体または部分レン
ズ群を、光軸に垂直な方向の成分を持つように移動させるか、或いは光軸を含む面内方向
に回転移動（揺動）させて、手ブレ等によって生じる像ブレを補正する防振レンズ群とし
てもよい。特に、第３レンズ群Ｇ３を防振レンズ群とするのが好ましい。 In the zoom lens ZL according to the present embodiment, either the entire lens group or the partial lens group is moved so as to have a component in a direction perpendicular to the optical axis, or rotated in an in-plane direction including the optical axis ( The image stabilizing lens group may be configured to correct image blur caused by camera shake or the like. In particular, the third lens group G3 is preferably an anti-vibration lens group.

本実施形態に係るズームレンズＺＬにおいて、レンズ面は、球面または平面で形成され
ても、非球面で形成されても構わない。レンズ面が球面または平面の場合、レンズ加工お
よび組立調整が容易になり、加工および組立調整の誤差による光学性能の劣化を防げるの
で好ましい。また、像面がずれた場合でも描写性能の劣化が少ないので好ましい。レンズ
面が非球面の場合、非球面は、研削加工による非球面、ガラスを型で非球面形状に形成し
たガラスモールド非球面、ガラスの表面に樹脂を非球面形状に形成した複合型非球面のい
ずれの非球面でも構わない。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）あるいはプラスチックレンズとしてもよい。 In the zoom lens ZL according to the present embodiment, the lens surface may be formed as a spherical surface, a flat surface, or an aspherical surface. When the lens surface is a spherical surface or a flat surface, lens processing and assembly adjustment are facilitated, and optical performance deterioration due to errors in 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 an aspheric surface, the aspheric surface is an aspheric surface by grinding, a glass mold aspheric surface made of glass with an aspheric shape, or a composite aspheric surface made of resin with an aspheric shape on the glass surface. Any aspherical surface may be used. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.

本実施形態に係るズームレンズＺＬにおいて、開口絞りＳは、第３レンズ群Ｇ３の近傍
に配置されるのが好ましいが、開口絞りとしての部材を設けずに、レンズの枠でその役割
を代用してもよい。 In the zoom lens ZL according to the present embodiment, the aperture stop S is preferably arranged in the vicinity of the third lens group G3, but instead of providing a member as an aperture stop, a role of the lens frame is used instead. May be.

本実施形態に係るズームレンズＺＬにおいて、各レンズ面に、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ために、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。 In the zoom lens ZL according to the present embodiment, each lens surface may be provided with an antireflection film having high transmittance in a wide wavelength region in order to reduce flare and ghost and achieve high contrast and high optical performance. .

ＺＬ（ＺＬ１〜ＺＬ３）ズームレンズ
Ｇ１第１レンズ群
Ｇ２第２レンズ群
Ｇ３第３レンズ群
Ｇ４第４レンズ群
Ｇ５第５レンズ群
Ｓ開口絞り
ＦＬフィルタ
Ｉ像面
ＣＡＭデジタルスチルカメラ（光学機器） ZL (ZL1 to ZL3) Zoom lens G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group G5 Fifth lens group S Aperture stop FL filter I Image plane CAM Digital still camera (optical equipment)

Claims

A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, arranged in order from the object side along the optical axis, and a negative It has a fourth lens group having a refractive power and a fifth lens group having a positive refractive power, and changing the distance between each lens group,
The first lens group is composed of three or more lenses,
The fourth lens group is composed of two or less lenses,
The fifth lens group is composed of two or less lenses, and moves to the image plane side upon zooming from the wide-angle end state to the telephoto end state.
A zoom lens satisfying the following conditional expression:
5.80 <Dt12 / (− f2)
However,
Dt12: distance on the optical axis from the image side surface of the first lens group to the object side surface of the second lens group in the telephoto end state;
f2: focal length of the second lens group.

A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, arranged in order from the object side along the optical axis, and a negative It has a fourth lens group having a refractive power and a fifth lens group having a positive refractive power, and changing the distance between each lens group,
The first lens group is composed of three or more lenses,
The fourth lens group is composed of two or less lenses,
The fifth lens group is composed of two or less lenses, and moves to the image plane side upon zooming from the wide-angle end state to the telephoto end state.
A zoom lens satisfying the following conditional expression:
0.01 <D1 / ft <0.15
0.70 <Zidwt / Fnwt <1.10
However,
D1: Distance on the optical axis from the object side surface to the image side surface of the first lens group,
ft: focal length of the entire system in the telephoto end state,
βt4: magnification of the fourth lens group in the telephoto end state,
βt5: magnification of the fifth lens group in the telephoto end state,
βw4: magnification of the fourth lens group in the wide-angle end state;
βw5: magnification of the fifth lens group in the wide-angle end state;
Fnt: F number in the telephoto end state,
Fnw: F number in the wide-angle end state.
In addition,
Zidwt = {(1-βt4 ^ 2) * βt5 ^ 2} / {(1-βw4 ^ 2) * βw5 ^ 2}
Fnwt = Fnt / Fnw
It is defined as

The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
0.03 <Mv2 / ft
However,
Mv2: the amount of movement of the second lens group from the wide-angle end state to the telephoto end state,
ft: focal length of the entire system in the telephoto end state.

The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
0.01 <D1 / ft <0.15
However,
D1: Distance on the optical axis from the object side surface to the image side surface of the first lens group,
ft: focal length of the entire system in the telephoto end state.

The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
0.70 <Zidwt / Fnwt <1.10
In addition,
Zidwt = {(1-βt4 ^ 2) * βt5 ^ 2} / {(1-βw4 ^ 2) * βw5 ^ 2}
Fnwt = Fnt / Fnw
It is defined as
However,
βt4: magnification of the fourth lens group in the telephoto end state,
βt5: magnification of the fifth lens group in the telephoto end state,
βw4: magnification of the fourth lens group in the wide-angle end state;
βw5: magnification of the fifth lens group in the wide-angle end state;
Fnt: F number in the telephoto end state,
Fnw: F number in the wide-angle end state.

The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
2.70 <βt3 / βw3
However,
βt3: magnification of the third lens group in the telephoto end state,
βw3: The magnification of the third lens group in the wide-angle end state.

The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
8.40 <f1 / (− f2)
However,
f1: Focal length of the first lens group.

The zoom lens according to claim 1, wherein the fourth lens group includes two lenses, and the two lenses are cemented.

The zoom lens according to any one of claims 1 to 8, wherein the fifth lens group includes two lenses, and the two lenses are cemented.

The second lens group is arranged in order from the object side along the optical axis, a negative lens, a negative lens,
The zoom lens according to claim 1, comprising a positive lens and a negative lens.

The third lens group includes a positive lens, a negative lens, a negative lens, and a positive lens arranged in order from the image side along the optical axis. The zoom lens according to item.

The zoom lens according to claim 1, wherein focusing is performed by moving the fourth lens group along an optical axis direction.

An optical apparatus comprising the zoom lens according to any one of claims 1 to 12.

A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, arranged in order from the object side along the optical axis, and a negative A zoom lens manufacturing method having a fourth lens group having a refractive power and a fifth lens group having a positive refractive power, and performing zooming by changing an interval between the lens groups,
The first lens group is composed of three or more lenses,
The fourth lens group is composed of two or less lenses,
The fifth lens group is composed of two or less lenses, and moves to the image plane side upon zooming from the wide-angle end state to the telephoto end state.
A method of manufacturing a zoom lens, wherein each lens is arranged in a lens barrel so as to satisfy the following conditional expression:
5.80 <Dt12 / (− f2)
However,
Dt12: distance on the optical axis from the image side surface of the first lens group to the object side surface of the second lens group in the telephoto end state;
f2: focal length of the second lens group.