JP6519229B2

JP6519229B2 - Photographing lens, optical apparatus provided with photographing lens, manufacturing method of photographing lens

Info

Publication number: JP6519229B2
Application number: JP2015038236A
Authority: JP
Inventors: 俊典武; 哲史三輪; 雅史山下
Original assignee: Nikon Corp
Current assignee: Nikon Corp
Priority date: 2015-02-27
Filing date: 2015-02-27
Publication date: 2019-05-29
Anticipated expiration: 2035-02-27
Also published as: JP2016161643A

Description

本発明は、写真用カメラや電子スチルカメラ、ビデオカメラ等に適した撮影レンズと、この撮影レンズを備えた光学機器、および撮影レンズの製造方法に関する。 The present invention relates to a photographing lens suitable for a photographic camera, an electronic still camera, a video camera or the like, an optical apparatus provided with the photographing lens, and a method of manufacturing the photographing lens.

従来、写真用カメラやビデオカメラ等に適した、小型の撮影レンズが提案されている（例えば、特許文献１参照）。 Conventionally, a small-sized photographing lens suitable for a photographic camera, a video camera or the like has been proposed (for example, see Patent Document 1).

特開２０１１−０８１０６４号公報JP, 2011-081064, A

しかしながら、従来の小型の撮影レンズにあっては、光学性能が充分ではないという問題がある。 However, in the conventional small-sized photographing lens, there is a problem that the optical performance is not sufficient.

上記課題を解決するために、本発明は、光軸に沿って物体側から順に、複数のレンズで構成された前側レンズ群と、開口絞りと、複数のレンズで構成された後側レンズ群とで構成され、前記後側レンズ群は、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群と、前記後側ａ部分レンズ群と空気間隔を隔てて配置された後側ｂ部分レンズ群とから構成され、前記後側ａ部分レンズ群は３枚以下のレンズで構成され、無限遠物体から近距離物体へ合焦する際、前記後側ａ部分レンズ群が合焦レンズ群として光軸に沿って移動し、以下の条件式を満足する撮影レンズを提供する。
０．１０＜ＴＬｆ／ＴＬ＜０．４０
３．０＜ｈ１／ｈｆ
ＴＬ／ｆ＜１．２
ただし、
ＴＬｆ：前記合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ＴＬ：前記前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ｈ１：前記前側レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｈｆ：前記合焦レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｆ：前記撮影レンズ全系の焦点距離
また、本発明は、光軸に沿って物体側から順に、複数のレンズで構成された前側レンズ群と、開口絞りと、複数のレンズで構成された後側レンズ群とで構成され、
前記後側レンズ群は、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群と、前記後側ａ部分レンズ群と空気間隔を隔てて配置された後側ｂ部分レンズ群とから構成され、
前記後側ａ部分レンズ群は３枚以下のレンズで構成され、
無限遠物体から近距離物体へ合焦する際、前記後側ａ部分レンズ群が合焦レンズ群として光軸に沿って移動し、
以下の条件式を満足し、
０．１０＜ＴＬｆ／ＴＬ＜０．４０
３．０＜ｈ１／ｈｆ
ただし、
ＴＬｆ：前記合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ＴＬ：前記前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ｈ１：前記前側レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｈｆ：前記合焦レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
前記前側レンズ群が以下の条件式を満足する少なくとも１枚のレンズを有する撮影レンズを提供する。
８５＜ νｄｈ
ただし、
νｄｈ：前記前側レンズ群中の前記少なくとも１枚のレンズの硝材のｄ線に対するアッベ数
また、本発明は、光軸に沿って物体側から順に、複数のレンズで構成された前側レンズ群と、開口絞りと、複数のレンズで構成された後側レンズ群とで構成され、
前記後側レンズ群は、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群と、前記後側ａ部分レンズ群と空気間隔を隔てて配置された後側ｂ部分レンズ群とから構成され、
前記後側ａ部分レンズ群は３枚以下のレンズで構成され、
無限遠物体から近距離物体へ合焦する際、前記後側ａ部分レンズ群が合焦レンズ群として光軸に沿って移動し、
以下の条件式を満足する撮影レンズを提供する。
０．１０＜ＴＬｆ／ＴＬ＜０．４０
３．０＜ｈ１／ｈｆ
｜ｆｆ／ｆＦ＋ｆｆ／ｆＡ｜＜０．６９
ただし、
ＴＬｆ：前記合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ＴＬ：前記前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ｈ１：前記前側レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｈｆ：前記合焦レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｆｆ：前記合焦レンズ群の焦点距離
ｆＦ：前記合焦レンズ群よりも物体側にあるレンズ全体の無限遠物体合焦状態における合成焦点距離
ｆＡ：前記合焦レンズ群と前記合焦レンズ群よりも物体側にあるレンズ全体との無限遠物体合焦状態における合成焦点距離
また、本発明は、光軸に沿って物体側から順に、複数のレンズで構成された前側レンズ群と、開口絞りと、複数のレンズで構成された後側レンズ群とで構成され、
前記後側レンズ群は、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群と、前記後側ａ部分レンズ群と空気間隔を隔てて配置された後側ｂ部分レンズ群とから構成され、
前記後側ａ部分レンズ群は３枚以下のレンズで構成され、
無限遠物体から近距離物体へ合焦する際、前記後側ａ部分レンズ群が合焦レンズ群として光軸に沿って移動し、
以下の条件式を満足し、
０．１０＜ＴＬｆ／ＴＬ＜０．４０
３．０＜ｈ１／ｈｆ
ただし、
ＴＬｆ：前記合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ＴＬ：前記前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ｈ１：前記前側レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｈｆ：前記合焦レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
前記前側レンズ群が以下の条件式を満足する少なくとも１枚のレンズを有し、
νｄｐ ≦ ２３．８０
ただし、
νｄｐ：前記前側レンズ群中の前記少なくとも１枚のレンズの硝材のｄ線に対するアッベ数
前記前側レンズ群が以下の条件式を満足する少なくとも１枚のレンズを有する撮影レンズを提供する。
８０＜ νｄｈ
ただし、
νｄｈ：前記前側レンズ群中の前記少なくとも１枚のレンズの硝材のｄ線に対するアッベ数
また、本発明は、光軸に沿って物体側から順に、複数のレンズで構成された前側レンズ群と、開口絞りと、複数のレンズで構成された後側レンズ群とで構成され、
前記後側レンズ群は、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群と、前記後側ａ部分レンズ群と空気間隔を隔てて配置された後側ｂ部分レンズ群とから構成され、
前記後側ａ部分レンズ群は３枚以下のレンズで構成され、
無限遠物体から近距離物体へ合焦する際、前記後側ａ部分レンズ群が合焦レンズ群として光軸に沿って移動し、
以下の条件式を満足する撮影レンズを提供する。
０．３１８ ≦ ＴＬｆ／ＴＬ＜０．４０
３．０＜ｈ１／ｈｆ
０．０１＜｜ｆｆ／ｆＲ｜＜１．００
ただし、
ＴＬｆ：前記合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ＴＬ：前記前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ｈ１：前記前側レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｈｆ：前記合焦レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｆｆ：前記合焦レンズ群の焦点距離
ｆＲ：前記合焦レンズ群よりも像側にあるレンズ全体の無限遠物体合焦状態における合成焦点距離 In order to solve the above problems, according to the present invention, a front lens group including a plurality of lenses, an aperture stop, and a rear lens group including a plurality of lenses are arranged in order from the object side along the optical axis The rear lens group is disposed along the optical axis in order from the object side, with an air gap from the rear a partial lens group having positive refractive power and the rear a partial lens group. The rear a partial lens group includes three or less lenses, and the rear a partial lens group is configured to focus from an infinite distance object to a near distance object. A taking lens which moves along an optical axis as a focusing lens group and satisfies the following conditional expression is provided.
0.10 <TLf / TL <0.40
3.0 <h1 / hf
TL / f <1.2
However,
TLf: distance on the optical axis from the lens surface closest to the object side to the image plane of the focusing lens group TL: distance on the optical axis from the lens surface closest to the object side to the image plane h1: above The height from the optical axis of a collimated light beam from an infinite distance object that determines the open F-number, which passes through the lens surface closest to the object side in the front lens group hf: The lens surface that faces the most object side of the focusing lens group The height from the optical axis of the parallel luminous flux from an infinitely distant object which determines the F value
f: focal length of the whole shooting lens system
Further, the present invention comprises, in order from the object side along the optical axis, a front lens group made up of a plurality of lenses, an aperture stop, and a rear side lens group made up of a plurality of lenses,
The rear lens group is arranged in order from the object side along the optical axis from the rear a partial lens group having positive refractive power and the rear a partial lens group at a rear side b. Composed of a partial lens group,
The rear side a lens group is composed of three or less lenses,
When focusing from an infinite distance object to a close distance object, the rear side a lens group moves as a focusing lens group along the optical axis,
The following conditional expressions are satisfied,
0.10 <TLf / TL <0.40
3.0 <h1 / hf
However,
TLf: distance on the optical axis from the lens surface closest to the object side of the focusing lens unit to the image plane
TL: distance on the optical axis from the lens surface closest to the object side of the front lens unit to the image plane
h1: height from the optical axis of a parallel light flux from an infinite distance object which determines the open F value, which passes through the lens surface closest to the object side of the front lens group
hf: height from the optical axis of a parallel light flux from an infinite distance object which determines the open F value, which passes through the lens surface closest to the object side of the focusing lens group
The present invention provides a photographing lens having at least one lens in which the front lens group satisfies the following conditional expression.
85 <dhdh
However,
dh dh: Abbe's number for the d-line of the glass material of the at least one lens in the front lens group
Further, the present invention comprises, in order from the object side along the optical axis, a front lens group made up of a plurality of lenses, an aperture stop, and a rear side lens group made up of a plurality of lenses,
The rear lens group is arranged in order from the object side along the optical axis from the rear a partial lens group having positive refractive power and the rear a partial lens group at a rear side b. Composed of a partial lens group,
The rear side a lens group is composed of three or less lenses,
When focusing from an infinite distance object to a close distance object, the rear side a lens group moves as a focusing lens group along the optical axis,
Provided is a photographing lens that satisfies the following conditional expression.
0.10 <TLf / TL <0.40
3.0 <h1 / hf
| Ff / fF + ff / fA | <0.69
However,
TLf: distance on the optical axis from the lens surface closest to the object side of the focusing lens unit to the image plane
TL: distance on the optical axis from the lens surface closest to the object side of the front lens unit to the image plane
h1: height from the optical axis of a parallel light flux from an infinite distance object which determines the open F value, which passes through the lens surface closest to the object side of the front lens group
hf: height from the optical axis of a parallel light flux from an infinite distance object which determines the open F value, which passes through the lens surface closest to the object side of the focusing lens group
ff: focal length of the focusing lens group
fF: synthetic focal length in the infinite object focusing state of the whole lens located on the object side of the focusing lens group
fA: combined focal length in an infinite distance object focusing state of the focusing lens group and the entire lens on the object side of the focusing lens group
Further, the present invention comprises, in order from the object side along the optical axis, a front lens group made up of a plurality of lenses, an aperture stop, and a rear side lens group made up of a plurality of lenses,
The rear lens group is arranged in order from the object side along the optical axis from the rear a partial lens group having positive refractive power and the rear a partial lens group at a rear side b. Composed of a partial lens group,
The rear side a lens group is composed of three or less lenses,
When focusing from an infinite distance object to a close distance object, the rear side a lens group moves as a focusing lens group along the optical axis,
The following conditional expressions are satisfied,
0.10 <TLf / TL <0.40
3.0 <h1 / hf
However,
TLf: distance on the optical axis from the lens surface closest to the object side of the focusing lens unit to the image plane
TL: distance on the optical axis from the lens surface closest to the object side of the front lens unit to the image plane
h1: height from the optical axis of a parallel light flux from an infinite distance object which determines the open F value, which passes through the lens surface closest to the object side of the front lens group
hf: height from the optical axis of a parallel light flux from an infinite distance object which determines the open F value, which passes through the lens surface closest to the object side of the focusing lens group
The front lens group has at least one lens satisfying the following conditional expression,
dp dp ≦ 23.80
However,
dpdp: Abbe's number for the d-line of the glass material of the at least one lens in the front lens group
The present invention provides a photographing lens having at least one lens in which the front lens group satisfies the following conditional expression.
80 <dhdh
However,
dh dh: Abbe's number for the d-line of the glass material of the at least one lens in the front lens group
Further, the present invention comprises, in order from the object side along the optical axis, a front lens group made up of a plurality of lenses, an aperture stop, and a rear side lens group made up of a plurality of lenses,
The rear lens group is arranged in order from the object side along the optical axis from the rear a partial lens group having positive refractive power and the rear a partial lens group at a rear side b. Composed of a partial lens group,
The rear side a lens group is composed of three or less lenses,
When focusing from an infinite distance object to a close distance object, the rear side a lens group moves as a focusing lens group along the optical axis,
Provided is a photographing lens that satisfies the following conditional expression.
0.318 ≦ TLf / TL <0.40
3.0 <h1 / hf
0.01 <| ff / fR | <1.00
However,
TLf: distance on the optical axis from the lens surface closest to the object side of the focusing lens unit to the image plane
TL: distance on the optical axis from the lens surface closest to the object side of the front lens unit to the image plane
h1: height from the optical axis of a parallel light flux from an infinite distance object which determines the open F value, which passes through the lens surface closest to the object side of the front lens group
hf: height from the optical axis of a parallel light flux from an infinite distance object which determines the open F value, which passes through the lens surface closest to the object side of the focusing lens group
ff: focal length of the focusing lens group
fR: synthetic focal length in the infinite object focusing state of the whole lens located on the image side of the focusing lens group

また、本発明は、上記撮影レンズを備えた光学機器を提供する。 Further, the present invention provides an optical apparatus provided with the above-mentioned imaging lens.

第１実施例に係る撮影レンズの構成を示す断面図である。It is sectional drawing which shows the structure of the imaging lens which concerns on 1st Example. 第１実施例に係る撮影レンズの諸収差図であり、（ａ）は無限遠物体合焦時を示し、（ｂ）は近距離物体合焦時を示している。FIG. 7 shows various aberrations that occurred in the imaging lens according to the first example, wherein (a) shows the time of focusing on an infinite distance object, and (b) shows the time of focusing on a short distance object. 第２実施例に係る撮影レンズの構成を示す断面図である。It is sectional drawing which shows the structure of the imaging lens which concerns on 2nd Example. 第２実施例に係る撮影レンズの諸収差図であり、（ａ）は無限遠物体合焦時を示し、（ｂ）は近距離物体合焦時を示している。FIG. 7 shows various aberrations that occurred in the imaging lens of the second example, with (a) showing the time of focusing on an infinite distance object and (b) showing the time of focusing on a short distance object. 第３実施例に係る撮影レンズの構成を示す断面図である。It is sectional drawing which shows the structure of the imaging lens which concerns on 3rd Example. 第３実施例に係る撮影レンズの諸収差図であり、（ａ）は無限遠物体合焦時を示し、（ｂ）は近距離物体合焦時を示している。FIG. 7 shows various aberrations that occurred in the imaging lens of the third example, with (a) showing an infinite object in focus, and (b) showing a close object in focus. 実施形態に係る撮影レンズを備えた光学機器の断面図である。FIG. 1 is a cross-sectional view of an optical device provided with a photographing lens according to an embodiment. 実施形態に係る撮影レンズの製造方法の概略を示す図である。It is a figure which shows the outline of the manufacturing method of the imaging lens which concerns on embodiment.

以下、実施形態に係る撮影レンズ、光学機器、および撮影レンズの製造方法について説明する。まず、実施形態に係る撮影レンズから説明する。 Hereinafter, a photographing lens, an optical device, and a method of manufacturing the photographing lens according to the embodiment will be described. First, the photographing lens according to the embodiment will be described.

本実施形態に係る撮影レンズは、光軸に沿って物体側から順に、複数のレンズで構成された前側レンズ群と、開口絞りと、複数のレンズで構成された後側レンズ群とで構成され、前記後側レンズ群は、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群と、前記後側ａ部分レンズ群と空気間隔を隔てて配置された後側ｂ部分レンズ群とから構成され、前記後側ａ部分レンズ群は３枚以下のレンズで構成され、無限遠物体から近距離物体へ合焦する際、前記後側ａ部分レンズ群が合焦レンズ群として光軸に沿って移動する。
この構成により高い光学性能を達成しつつ、小型のモータユニットで合焦レンズ群を駆動することができる。 The photographing lens according to the present embodiment includes, in order from the object side along the optical axis, a front lens group including a plurality of lenses, an aperture stop, and a rear side lens group including a plurality of lenses. The rear lens group is arranged in order from the object side along the optical axis from the rear a partial lens group having positive refractive power and the rear a partial lens group at an air gap from the rear side. The rear side a partial lens group comprises three or less lenses, and the rear side a partial lens group is a focusing lens when focusing from an infinite distance object to a near distance object. Move along the optical axis as a group.
With this configuration, it is possible to drive the focusing lens group with a small motor unit while achieving high optical performance.

また、本実施形態に係る撮影レンズは、このような構成のもと、次の条件式（１）を満足する。
（１）０．１０＜ＴＬｆ／ＴＬ＜０．４０
ただし、
ＴＬｆ：前記合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ＴＬ：前記前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離 Further, the photographing lens according to the present embodiment satisfies the following conditional expression (1) with such a configuration.
(1) 0.10 <TLf / TL <0.40
However,
TLf: distance on the optical axis from the lens surface closest to the object side of the focusing lens group to the image plane TL: distance on the optical axis from the lens surface closest to the object side of the front lens group to the image plane

条件式（１）は、合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離と、前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離、すなわち撮影レンズ全系の全長との比の適切な範囲を規定するための条件式である。条件式（１）を満足することにより、非点収差を良好に補正することができる。 Conditional expression (1) is the distance on the optical axis from the lens surface closest to the object side to the image plane of the focusing lens group, and the distance on the optical axis from the lens surface closest to the object side to the image plane of the front lens group That is, it is a conditional expression for defining an appropriate range of the ratio to the total length of the photographing lens. By satisfying the conditional expression (1), astigmatism can be corrected well.

条件式（１）の対応値が上限値を上回ると、合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離が大きくなりすぎ、合焦レンズ群を小型化するために後側ｂ部分レンズ群の屈折力を強くすると、非点収差の補正が困難となってしまう。なお、本実施形態の効果を確実にするために、条件式（１）の上限値を０．３５にすることが好ましい。 When the corresponding value of the conditional expression (1) exceeds the upper limit value, the distance on the optical axis from the lens surface closest to the object side of the focusing lens unit to the image plane becomes too large, and the focusing lens unit is miniaturized. If the refracting power of the rear b-side lens group is increased, it becomes difficult to correct astigmatism. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (1) to 0.35.

一方、条件式（１）の対応値が下限値を下回ると、合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離が小さくなりすぎ、合焦時の非点収差の補正が困難となってしまう。なお、本実施形態の効果を確実にするために、条件式（１）の下限値を０．１５にすることが好ましい。 On the other hand, when the corresponding value of the conditional expression (1) falls below the lower limit value, the distance on the optical axis from the lens surface closest to the object side of the focusing lens unit to the image plane becomes too small. Correction becomes difficult. In order to secure the effect of the present embodiment, it is preferable to set the lower limit value of conditional expression (1) to 0.15.

また、本実施形態に係る撮影レンズは、このような構成のもと、次の条件式（２）を満足する。
（２）３．０＜ｈ１／ｈｆ
ただし、
ｈ１：前記前側レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｈｆ：前記合焦レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ In addition, the photographing lens according to the present embodiment satisfies the following conditional expression (2) with such a configuration.
(2) 3.0 <h1 / hf
However,
h1: height from the optical axis of a parallel light flux from an infinite distance object which determines the open F-number passing through the most object side lens surface of the front lens group hf: lens surface of the focusing lens group most object side The height from the optical axis of a collimated light beam from an infinitely distant object that passes through, which determines the open f-number

条件式（２）は、前側レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さと、合焦レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さとの比の適切な範囲を規定するための条件式である。条件式（２）の対応値が下限値を下回ると、合焦レンズ群の屈折力が相対的に弱くなってしまい、その結果合焦レンズ群単体で発生する球面収差が補正不足となってしまい、好ましくない。また、前側レンズ群の最も物体側のレンズの屈折力が相対的に強くなるため、前側レンズ群で球面収差およびコマ収差が多大に発生してしまい、好ましくない。なお、本実施形態の効果を確実にするために、条件式（２）の下限値を３．１にすることが好ましい。 The conditional expression (2) is the height from the optical axis of the parallel light flux from the infinite distance object which determines the open F value, which passes through the lens surface closest to the object side of the front lens group, and the lens closest to the object side of the focusing lens group It is a conditional expression for defining an appropriate range of the ratio of the height from the optical axis of the parallel light flux from the infinitely distant object which determines the open F value, which passes through the surface. When the corresponding value of the conditional expression (2) falls below the lower limit value, the refractive power of the focusing lens unit becomes relatively weak, and as a result, the spherical aberration generated in the focusing lens unit alone becomes undercorrected Not desirable. In addition, since the refractive power of the lens closest to the object side of the front lens group becomes relatively strong, a large amount of spherical aberration and coma aberration are generated in the front lens group, which is not preferable. In order to secure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (2) to 3.1.

また、本実施形態の効果をさらに確実にするために、条件式（２）の上限値を９．０にすることが好ましい。条件式（２）の対応値が９．０を下回ることにより、球面収差を良好に補正し、高い光学性能を実現することができる。 Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (2) to 9.0. When the corresponding value of the conditional expression (2) falls below 9.0, spherical aberration can be corrected well, and high optical performance can be realized.

また、本実施形態に係る撮影レンズは、以下の条件式（３）を満足することが望ましい。
（３）０．０１＜｜ｆｆ／ｆＲ｜
ただし、
ｆｆ：前記合焦レンズ群の焦点距離
ｆＲ：前記合焦レンズ群よりも像側にあるレンズ全体の無限遠物体合焦状態における合成焦点距離 Moreover, as for the imaging lens which concerns on this embodiment, it is desirable to satisfy the following conditional expressions (3).
(3) 0.01 <| ff / fR |
However,
ff: Focal length of the focusing lens group fR: Synthetic focal length in the infinite object focusing state of the whole lens located on the image side of the focusing lens group

条件式（３）は、合焦レンズ群の焦点距離と、合焦レンズ群よりも像側にあるレンズ全体の無限遠物体合焦状態における合成焦点距離との比の適切な範囲を規定するための条件式である。条件式（３）の対応値が下限値を下回ると、合焦レンズ群よりも像側にあるレンズ全体の無限遠物体合焦状態における合成焦点距離が大きくなりすぎ、合焦時の球面収差および非点収差の補正が困難となってしまう。なお、本実施形態の効果を確実にするために、条件式（３）の下限値を０．０５にすることが好ましい。 Conditional expression (3) defines an appropriate range of the ratio of the focal length of the focusing lens group to the combined focal length in the infinite object focusing state of the entire lens located on the image side of the focusing lens group. It is a conditional expression of When the corresponding value of the conditional expression (3) falls below the lower limit value, the combined focal length in the infinity object focusing state of the entire lens located on the image side of the focusing lens unit becomes too large, and the spherical aberration at the time of focusing Correction of astigmatism becomes difficult. In order to secure the effect of the present embodiment, it is preferable to set the lower limit value of conditional expression (3) to 0.05.

また、本実施形態の効果をさらに確実にするために、条件式（３）の上限値を１．００にすることが好ましい。条件式（３）の対応値が１．００を下回ることにより、球面収差と非点収差を良好に補正し、高い光学性能を実現することができる。 Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (3) to 1.00. When the corresponding value of the conditional expression (3) falls below 1.00, spherical aberration and astigmatism can be corrected well, and high optical performance can be realized.

また、本実施形態に係る撮影レンズは、以下の条件式（４）を満足することが望ましい。
（４）｜ｆｆ／ｆＦ＋ｆｆ／ｆＡ｜＜０．６９
ただし、
ｆｆ：前記合焦レンズ群の焦点距離
ｆＦ：前記合焦レンズ群よりも物体側にあるレンズ全体の無限遠物体合焦状態における合成焦点距離
ｆＡ：前記合焦レンズ群と前記合焦レンズ群よりも物体側にあるレンズ全体との無限遠物体合焦状態における合成焦点距離 Moreover, as for the imaging lens which concerns on this embodiment, it is desirable to satisfy the following conditional expressions (4).
(4) | ff / fF + ff / fA | <0.69
However,
ff: focal length of the focusing lens group fF: combined focal length of the whole lens on the object side of the focusing lens group in an infinite distance object focusing state fA: from the focusing lens group and the focusing lens group Combined focal length in an infinite object focusing state with the entire lens on the object side

条件式（４）は、合焦レンズ群の焦点距離と、合焦レンズ群よりも物体側にあるレンズ全体の無限遠物体合焦状態における合成焦点距離との比と、合焦レンズ群の焦点距離と、合焦レンズ群と合焦レンズ群よりも物体側にあるレンズ全体との無限遠物体合焦状態における合成焦点距離との比との和の適正な範囲を規定するための条件式である。条件式（４）の対応値が上限値を上回ると、合焦レンズ群の屈折力が相対的に弱くなってしまい、その結果合焦レンズ群単体で発生する球面収差が補正不足となってしまい、好ましくない。また、前側レンズ群の最も物体側のレンズの屈折力が相対的に強くなるため、前側レンズ群で球面収差およびコマ収差が多大に発生してしまい、好ましくない。なお、本実施形態の効果を確実にするために、条件式（４）の上限値を０．６８にすることが好ましい。 The conditional expression (4) is the ratio of the focal length of the focusing lens group to the combined focal length in the infinite object focusing state of the whole lens on the object side of the focusing lens group, and the focal point of the focusing lens group. The conditional expression for defining the appropriate range of the sum of the distance and the ratio of the focusing lens group and the combined focal length in the infinity object focusing state with the entire lens on the object side of the focusing lens group. is there. When the corresponding value of the conditional expression (4) exceeds the upper limit, the refractive power of the focusing lens unit becomes relatively weak, and as a result, the spherical aberration generated in the focusing lens unit alone becomes insufficiently corrected. Not desirable. In addition, since the refractive power of the lens closest to the object side of the front lens group becomes relatively strong, a large amount of spherical aberration and coma aberration are generated in the front lens group, which is not preferable. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (4) to 0.68.

また、本実施形態の効果をさらに確実にするために、条件式（４）の下限値を０．１０にすることが好ましい。条件式（４）の対応値が０．１０を上回ることにより、球面収差を良好に補正し、高い光学性能を実現することができる。 Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (4) to 0.10. When the corresponding value of the conditional expression (4) exceeds 0.10, spherical aberration can be corrected well, and high optical performance can be realized.

また、本実施形態に係る撮影レンズは、前記前側レンズ群が以下の条件式（５）を満足する少なくとも１枚のレンズを有することが望ましい。
（５）νｄｐ＜３５
ただし、
νｄｐ：前記前側レンズ群中の前記少なくとも１枚のレンズの硝材のｄ線に対するアッベ数 Further, in the photographing lens according to the present embodiment, it is desirable that the front lens group have at least one lens satisfying the following conditional expression (5).
(5) dp dp <35
However,
dpdp: Abbe's number for the d-line of the glass material of the at least one lens in the front lens group

条件式（５）は、前側レンズ群中の少なくとも１枚のレンズの硝材のｄ線に対するアッベ数を規定するための条件式である。条件式（５）の対応値が上限値を上回ると、軸上色収差の補正が困難になってしまう。なお、本実施形態の効果を確実にするために、条件式（５）の上限値を３３にすることが好ましい。また、本実施形態の効果をさらに確実にするために、条件式（５）の上限値を３２にすることが好ましい。 The conditional expression (5) is a conditional expression for defining the Abbe number for the d-line of the glass material of at least one lens in the front lens group. If the corresponding value of the conditional expression (5) exceeds the upper limit value, correction of axial chromatic aberration becomes difficult. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (5) to 33. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (5) to 32.

また、本実施形態に係る撮影レンズは、条件式（５）を満足する前記少なくとも１枚のレンズは、正の屈折力を有することが望ましい。この構成により、撮影レンズの全長を短縮しつつ、軸上色収差を良好に補正することができる。 In the photographing lens according to the present embodiment, it is desirable that the at least one lens satisfying the conditional expression (5) have positive refractive power. With this configuration, axial chromatic aberration can be favorably corrected while reducing the overall length of the imaging lens.

また、本実施形態に係る撮影レンズは、前記前側レンズ群が以下の条件式（６）を満足する少なくとも１枚のレンズを有することが望ましい。
（６）８０＜ νｄｈ
ただし、
νｄｈ：前記前側レンズ群中の前記少なくとも１枚のレンズの硝材のｄ線に対するアッベ数 Further, in the photographing lens according to the present embodiment, it is desirable that the front lens group have at least one lens satisfying the following conditional expression (6).
(6) 80 <dh dh
However,
dh dh: Abbe's number for the d-line of the glass material of the at least one lens in the front lens group

条件式（６）は、前側レンズ群中の少なくとも１枚のレンズの硝材のｄ線に対するアッベ数を規定するための条件式である。条件式（６）の対応値が下限値を下回ると、軸上色収差の補正が困難になってしまう。なお、本実施形態の効果を確実にするために、条件式（６）の下限値を８５にすることが好ましい。また、本実施形態の効果をさらに確実にするために、条件式（６）の下限値を９０にすることが好ましい。また、本実施形態の効果をさらに確実にするために、条件式（６）の下限値を９５にすることがさらに好ましい。 Conditional expression (6) is a conditional expression for defining the Abbe number to the d-line of the glass material of at least one lens in the front lens group. If the corresponding value of the conditional expression (6) falls below the lower limit value, correction of axial chromatic aberration becomes difficult. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (6) to 85. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (6) to 90. Further, in order to further ensure the effect of the present embodiment, it is more preferable to set the lower limit value of the conditional expression (6) to 95.

また、本実施形態に係る撮影レンズは、前記前側レンズ群を構成する前記複数のレンズは、１０枚以下であることが望ましい。この構成により、像面湾曲を良好に補正しつつ、撮影レンズの軽量化を達成することができる。 Moreover, as for the imaging lens which concerns on this embodiment, it is desirable for the said several lens which comprises the said front side lens group to be ten or less. According to this configuration, it is possible to reduce the weight of the imaging lens while properly correcting field curvature.

また、本実施形態に係る撮影レンズは、前記前側レンズ群を構成する前記複数のレンズは、６枚以上であることが望ましい。この構成により、撮影レンズの全長を短縮しつつ、軸上色収差を良好に補正することができる。 In the photographing lens according to the present embodiment, it is desirable that the plurality of lenses constituting the front lens group be six or more. With this configuration, axial chromatic aberration can be favorably corrected while reducing the overall length of the imaging lens.

また、本実施形態に係る撮影レンズは、前記後側レンズ群中の一部のレンズ群を光軸と直交する方向の成分を含むように移動させることによって像面上の像をシフトさせることが可能であることが望ましい。この構成により、手ブレ等で振動した場合の光軸のずれを補正することができ、結像性能を向上させることができる。 In the photographing lens according to the present embodiment, the image on the image plane may be shifted by moving a part of the lens groups in the rear side lens group so as to include a component in a direction orthogonal to the optical axis. It is desirable to be possible. With this configuration, it is possible to correct the shift of the optical axis when vibrating due to camera shake or the like, and to improve the imaging performance.

また、本実施形態に係る撮影レンズは、以下の条件式（７）を満足することが望ましい。
（７）ＴＬ／ｆ＜１．２
ただし、
ＴＬ：前記前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ｆ：前記撮影レンズ全系の焦点距離 Moreover, as for the imaging lens which concerns on this embodiment, it is desirable to satisfy the following conditional expressions (7).
(7) TL / f <1.2
However,
TL: Distance on the optical axis from the lens surface closest to the object side of the front lens group to the image plane f: Focal length of the entire photographing lens system

条件式（７）は、撮影レンズ全系の焦点距離に対する、前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離の比を規定するための条件式である。条件式（７）の対応値が上限値を上回ると、周辺光量が低下してしまい、これを補正するために入射瞳位置を前に出すと、歪曲収差の補正が困難となってしまう。なお、本実施形態の効果を確実にするために、条件式（７）の上限値を１．１にすることが好ましい。 The conditional expression (7) is a conditional expression for defining the ratio of the distance on the optical axis from the lens surface on the most object side of the front lens group to the image plane with respect to the focal length of the entire photographing lens system. When the corresponding value of the conditional expression (7) exceeds the upper limit value, the peripheral light amount decreases, and when the entrance pupil position is taken forward to correct this, the correction of distortion becomes difficult. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (7) to 1.1.

また、本実施形態の効果をさらに確実にするために、条件式（７）の下限値を０．６にすることが好ましい。条件式（７）の対応値が０．６を上回ることにより、歪曲収差を良好に補正し、高い光学性能を実現することができる。 Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (7) to 0.6. When the corresponding value of the conditional expression (7) exceeds 0.6, distortion can be corrected well, and high optical performance can be realized.

また、実施形態に係る光学機器は、上述した構成の撮影レンズを備えている。これにより、高い光学性能を備えた光学機器を実現することができる。 In addition, the optical device according to the embodiment includes the imaging lens having the above-described configuration. Thereby, an optical apparatus with high optical performance can be realized.

また、実施形態に係る撮影レンズの製造方法は、光軸に沿って物体側から順に、複数のレンズで構成された前側レンズ群と、開口絞りと、複数のレンズで構成された後側レンズ群とで構成された撮影レンズの製造方法であって、前記後側レンズ群を、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群と、前記後側ａ部分レンズ群と空気間隔を隔てて配置された後側ｂ部分レンズ群とから構成し、前記後側ａ部分レンズ群を３枚以下のレンズで構成し、無限遠物体から近距離物体へ合焦する際、前記後側ａ部分レンズ群が合焦レンズ群として光軸に沿って移動するように構成し、以下の条件式（１）、（２）を満足するように構成するものである
（１）０．１０＜ＴＬｆ／ＴＬ＜０．４０
（２）３．０＜ｈ１／ｈｆ
ただし、
ＴＬｆ：前記合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ＴＬ：前記前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ｈ１：前記前側レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｈｆ：前記合焦レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ Further, in the method of manufacturing the imaging lens according to the embodiment, the front lens group including the plurality of lenses, the aperture stop, and the rear lens group including the plurality of lenses are arranged in order from the object side along the optical axis. A rear lens group having a positive refractive power, a rear lens group a, a rear lens group a, and a rear lens group a in the order from the object side along the optical axis; Composed of a lens group and a rear b-part lens group arranged with an air gap, and the rear a-part lens group consists of three or less lenses and focuses from an infinite distance object to a near distance object In this case, the rear side a partial lens unit is configured to move along the optical axis as a focusing lens unit, and is configured to satisfy the following conditional expressions (1) and (2). ) 0.10 <TLf / TL <0.40
(2) 3.0 <h1 / hf
However,
TLf: distance on the optical axis from the lens surface closest to the object side to the image plane of the focusing lens group TL: distance on the optical axis from the lens surface closest to the object side to the image plane h1: above The height from the optical axis of a collimated light beam from an infinite distance object that determines the open F-number, which passes through the lens surface closest to the object side in the front lens group hf: The lens surface that faces the most object side of the focusing lens group The height from the optical axis of the parallel luminous flux from an infinitely distant object which determines the F value

斯かる撮影レンズの製造方法により、高い光学性能を備えた撮影レンズを製造することができる。 According to such a method of manufacturing a photographing lens, a photographing lens having high optical performance can be manufactured.

（数値実施例）
以下、本実施形態の数値実施例に係る撮影レンズを添付図面に基づいて説明する。 (Numerical example)
Hereinafter, a photographing lens according to a numerical example of the present embodiment will be described based on the attached drawings.

（第１実施例）
図１は、第１実施例に係る撮影レンズの構成を示す断面図である。
図１に示すように、本実施例に係る撮影レンズは、光軸に沿って物体側から順に、前側レンズ群ＧＦと、開口絞りＳと、後側レンズ群ＧＲとから構成されている。 (First embodiment)
FIG. 1 is a cross-sectional view showing the structure of a photographing lens according to the first example.
As shown in FIG. 1, the photographing lens according to the present embodiment includes, in order from the object side along the optical axis, a front lens group GF, an aperture stop S, and a rear lens group GR.

前側レンズ群ＧＦは、光軸に沿って物体側から順に、屈折力が極めて弱い保護ガラスＨＧと、両凸レンズＬ１１と、両凸レンズＬ１２と、両凹レンズＬ１３と、物体側に凸面を向けた負メニスカスレンズＬ１４と物体側に凸面を向けた正メニスカスレンズＬ１５との接合レンズと、物体側に凹面を向けた正メニスカスレンズＬ１６と、両凹レンズＬ１７とから構成されている。 The front lens group GF includes, in order from the object side along the optical axis, a protective glass HG having extremely weak refractive power, a biconvex lens L11, a biconvex lens L12, a biconcave lens L13, and a negative meniscus surface convex on the object side It comprises a cemented lens of a lens L14 and a positive meniscus lens L15 having a convex surface facing the object side, a positive meniscus lens L16 having a concave surface facing the object side, and a biconcave lens L17.

後側レンズ群ＧＲは、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群ＧＲａと、後側ａ部分レンズ群ＧＲａと空気間隔を隔てて配置された後側ｂ部分レンズ群ＧＲｂとから構成されている。
後側ａ部分レンズ群ＧＲａは、光軸に沿って物体側から順に、両凸レンズＬ２１と、物体側に凹面を向けた負メニスカスレンズＬ２２とから構成されている。
後群ｂ部分レンズ群ＧＲｂは、光軸に沿って物体側から順に、物体側に凹面を向けた正メニスカスレンズＬ２３と両凹レンズＬ２４との接合レンズと、物体側に凸面を向けた負メニスカスレンズＬ２５と、物体側に凸面を向けた正メニスカスレンズＬ２６と、両凸レンズＬ２７と両凹レンズＬ２８との接合レンズとから構成されている。 The rear lens group GR is disposed in order from the object side along the optical axis from the rear a partial lens group GRa having positive refractive power and the rear a partial lens group GRa with an air gap between them. and b a partial lens group GRb.
The rear side a partial lens group GRa is composed of a biconvex lens L21 and a negative meniscus lens L22 having a concave surface facing the object side, in this order from the object side along the optical axis.
The rear group b partial lens group GRb is a cemented lens of a positive meniscus lens L23 having a concave surface facing the object side along the optical axis and a biconcave lens L24 with a concave surface facing the object side, and a negative meniscus lens having a convex surface facing the object side It comprises a lens L25, a positive meniscus lens L26 with a convex surface facing the object side, and a cemented lens of a biconvex lens L27 and a biconcave lens L28.

後方レンズ群ＧＲの像面Ｉ側には、ローパスフィルタ等のフィルタＦＬが配置されている。 A filter FL such as a low pass filter is disposed on the image plane I side of the rear lens group GR.

像面Ｉ上には、ＣＣＤやＣＭＯＳ等から構成された撮像素子（図示省略）が配置されている。 On the image plane I, an imaging device (not shown) composed of a CCD, a CMOS or the like is disposed.

以上の構成のもと、本実施例に係る撮影レンズは、後側ａ部分レンズ群ＧＲａを合焦レンズ群Ｇｆとして物体側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が行われる。また、後群ｂ部分レンズ群ＧＲｂ中の、物体側に凹面を向けた正メニスカスレンズＬ２３と両凹レンズＬ２４との接合レンズと、物体側に凸面を向けた負メニスカスレンズＬ２５とを防振レンズ群として光軸と直交する方向の成分を含むように移動させることにより像面Ｉ上の像をシフトさせて、像ブレ発生時の像面補正、すなわち防振を行っている。 Based on the above configuration, in the imaging lens according to the present embodiment, focusing from an infinite distance object to a near distance object is achieved by moving the rear side a partial lens group GRa to the object side as the focusing lens group Gf. To be done. In addition, a cemented lens of a positive meniscus lens L23 having a concave surface facing the object side and a biconcave lens L24 in the rear group b partial lens group GRb, and a negative meniscus lens L25 having a convex surface facing the object side The image on the image plane I is shifted by moving so as to include the component in the direction orthogonal to the optical axis, and image plane correction at the time of occurrence of image blur, that is, image stabilization is performed.

以下の表１に、本実施例に係る撮影レンズの諸元の値を掲げる。
［全体諸元］において、ｆは焦点距離、ＦＮＯはＦナンバー、２ωは画角（単位は「°」）、Ｙは最大像高、ＴＬは撮影レンズの全長（無限遠物体合焦時の第１面から像面Ｉまでの光軸上の距離）、ＢＦはバックフォーカス（最も像側のレンズ面と像面Ｉとの光軸上の距離）を示す。また、空気換算ＴＬは無限遠物体合焦時の第１面から像面Ｉまでの光軸上の距離を、フィルタ等の光学ブロックを光路中から除去した状態で測ったときの値であり、空気換算ＢＦは後側レンズ群ＧＲ中の最も像側のレンズ面から像面Ｉまでの光軸上の距離を、フィルタ等の光学ブロックを光路中から除去した状態で測ったときの値である。 Table 1 below presents values of specifications of the photographing lens according to the present example.
In [Overall specifications], f is focal length, FNO is F number, 2ω is angle of view (unit: “°”), Y is maximum image height, TL is total length of shooting lens (No. The distance on the optical axis from 1 plane to the image plane I) and BF indicate the back focus (the distance on the optical axis between the lens surface closest to the image and the image plane I). Further, the air conversion TL is a value when the distance on the optical axis from the first surface to the image plane I at the time of focusing on an infinite distance object is measured with an optical block such as a filter removed from the optical path. The air conversion BF is a value when the distance on the optical axis from the lens surface closest to the image in the rear lens group GR to the image plane I is measured with an optical block such as a filter removed from the optical path. .

［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（波長５８７．６ｎｍ）に対する屈折率、νｄはｄ線（波長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。空気の屈折率ｎｄ＝1.000000の記載は省略している。 In [Surface Data], the surface number is the order of the optical surface counted from the object side, r is the radius of curvature, d is the surface distance (the distance between the nth surface (n is an integer) and the (n + 1) surface), nd is The refractive index for the d-line (wavelength 587.6 nm) and ν d indicate the Abbe number for the d-line (wavelength 587.6 nm). The object plane indicates the object plane, the variable plane spacing is variable, 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. The description of the refractive index nd = 1.000000 of air is omitted.

［可変間隔データ］において、ｆは焦点距離を、βは撮影倍率をそれぞれ示し、ｄｉ（ｉは整数）は第ｉ面と第（ｉ＋１）面との面間隔を示す。また、ｄ０は物体から最も物体側のレンズ面までの距離を示す。 In [Variable distance data], f indicates the focal length, β indicates the imaging magnification, and di (i is an integer) indicates the surface distance between the i-th surface and the (i + 1) -th surface. Also, d0 indicates the distance from the object to the lens surface closest to the object.

［レンズ群データ］には、各レンズ群の始面番号と焦点距離を示す。
［条件式対応値］には、各条件式の対応値をそれぞれ示す。 [Lens group data] indicates the starting surface number and focal length of each lens group.
[Conditional expression corresponding value] indicates the corresponding value of each conditional expression.

ここで、表１に記載されている焦点距離ｆや曲率半径ｒ、およびその他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、比例拡大また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, “mm” is generally used as the unit of focal length f and radius of curvature r described in Table 1 and other lengths. However, the optical system is not limited to this, because the same optical performance can be obtained by proportional enlargement or reduction.
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
［全体諸元］
ｆ 391.996
ＦＮＯ 2.880
２ω 6.278
Ｙ 21.60
ＴＬ 409.999
空気換算ＴＬ 409.488
ＢＦ 82.573
空気換算ＢＦ 82.062

［面データ］
面番号ｒｄｎｄ νｄ
物面 ∞
1) 1200.37040 5.000 1.51680 63.88
2) 1199.78970 1.500
3) 242.43420 15.500 1.43385 95.25
4) -1144.78160 45.000
5) 163.08360 19.000 1.43385 95.25
6) -485.25910 4.000
7) -441.97520 6.000 1.61266 44.46
8) 496.10830 85.000
9) 87.30330 5.400 1.79952 42.22
10) 50.29290 15.500 1.49782 82.57
11) 124.76650 38.108
12) -757.69690 4.000 1.84666 23.80
13) -102.21690 0.002
14) -108.46840 2.500 1.75500 52.33
15) 91.99150 4.980

16) ∞ (可変) (絞り)

17) 69.30120 8.500 1.49782 82.57
18) -78.17850 0.600
19) -74.91680 1.900 1.60562 43.71
20) -199.64260 (可変)

21) -20650.78400 4.500 1.88300 40.66
22) -100.03010 3.498 1.51860 69.89
23) 48.86300 3.757
24) 497.87240 3.500 1.65160 58.55
25) 59.08000 4.200
26) 75.55570 4.000 1.81600 46.59
27) 221.65890 0.758
28) 73.34850 4.800 1.74400 44.80
29) -160.31130 1.900 1.84666 23.80
30) 333.76060 6.500

31) ∞ 1.500 1.51680 63.88
32) ∞ 74.573
像面 ∞

［可変間隔データ］
無限遠至近撮影距離
forβ 391.996 -0.100
ｄ 0 ∞ 3991.000
ｄ16 28.022 18.987
ｄ20 6.000 15.035

［レンズ群データ］
群始面 f
GF 1 1487.865
GR 17 150.468

［条件式対応値］
（１）ＴＬｆ／ＴＬ＝0.318
（２）ｈ１／ｈｆ＝3.423
（３）｜ｆｆ／ｆＲ｜＝0.158
（４）｜ｆｆ／ｆＦ＋ｆｆ／ｆＡ｜＝0.447
（５）νｄｐ＝23.80
（６）νｄｈ＝95.25
（７）ＴＬ／ｆ＝1.046
(Table 1) First embodiment [Overall specifications]
f 391.996
FNO 2.880
2ω 6.278
Y 21.60
TL 409.999
Air conversion TL 409.488
BF 82.573
Air conversion BF 82.062

[Plane data]
Face number r d nd d d
Object ∞
1) 1200.37040 5.000 1.51680 63.88
2) 1199.789970 1.500
3) 242.43420 15.500 1.43385 95.25
4) -1144.78160 45.000
5) 163.08360 19.000 1.43385 95.25
6) -485.25910 4.000
7) -441.97520 6.000 1.61266 44.46
8) 496.10830 85.000
9) 87.30330 5.400 1.79952 42.22
10) 50.29290 15.500 1.49782 82.57
11) 124.76650 38.108
12) -757.69690 4.000 1.84666 23.80
13) -102.21690 0.002
14) -108.46840 2.500 1.75500 52.33
15) 91.99150 4.980

16) ∞ (variable) (aperture)

17) 69.30120 8.500 1.49782 82.57
18) -78.17850 0.600
19) -74.91680 1.900 1.60562 43.71
20) -199.64260 (variable)

21)-20650.78400 4.500 1.88300 40.66
22) -100.03010 3.498 1.51860 69.89
23) 48.86300 3.757
24) 497.87240 3.500 1.65160 58.55
25) 59.08000 4.200
26) 75.55570 4.000 1.81600 46.59
27) 221.65890 0.758
28) 73. 348550 4. 800 1. 74400 44. 80
29) -160.31130 1.900 1.84666 23.80
30) 333.76060 6.500

31) ∞ 1.500 1.51680 63.88
32) ∞ 74.573
Image plane ∞

[Variable interval data]
Infinity close distance
for β 391.996-0.100
d 0 ∞ 3991.000
d16 28.022 18.987
d20 6.000 15.035

[Lens group data]
Group front f
GF 1 1487.865
GR 17 150.468

[Conditional expression corresponding value]
(1) TLf / TL = 0.318
(2) h1 / hf = 3.423
(3) | ff / fR | = 0.158
(4) | ff / fF + ff / fA | = 0.447
(5) dp dp = 23.80
(6) dh dh = 95.25
(7) TL / f = 1.046

図２は、第１実施例に係る撮影レンズの諸収差図であり、（ａ）は無限遠物体合焦時を示し、（ｂ）は近距離物体合焦時を示している。 FIG. 2 is a diagram showing various aberrations of the photographing lens according to the first example, where (a) shows the time of focusing on an infinite distance object and (b) shows the time of focusing on a near distance object.

各収差図において、ＦＮＯはＦナンバーを、ＮＡは開口数を、Ｙは像高をそれぞれ示している。また、図中のｄはｄ線（波長λ＝５８７．６ｎｍ）での収差曲線を示し、ｇはｇ線（波長λ＝４３５．８ｎｍ）での収差曲線を示し、記載のないものはｄ線での収差曲線を示す。球面収差図では最大口径に対応するＦナンバーまたは開口数の値を示し、非点収差図及び歪曲収差図では像高の最大値をそれぞれ示し、コマ収差図では各像高の値を示している。非点収差を示す収差図において実線はサジタル像面を示し、破線はメリディオナル像面を示している。なお、以下に示す各実施例の諸収差図においても、本実施例と同様の符号を用いる。 In each of the aberration diagrams, FNO indicates the F number, NA indicates the numerical aperture, and Y indicates the image height. Further, d in the figure indicates an aberration curve at d line (wavelength λ = 587.6 nm), g indicates an aberration curve at g line (wavelength λ = 435.8 nm), and those not described indicate d line Shows the aberration curve at The spherical aberration diagram shows the f-number or the numerical aperture value corresponding to the maximum aperture, the astigmatism diagram and the distortion diagram each show the maximum value of the image height, and the coma aberration diagram shows the value of each image height . In aberration diagrams showing astigmatism, a solid line indicates a sagittal image plane, and a broken line indicates a meridional image plane. The same reference numerals as in this example are used also in the various aberration diagrams of the examples below.

各収差図から明らかなように、第１実施例に係る撮影レンズは、無限遠物体合焦状態から近距離物体合焦状態に亘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。
As apparent from the respective aberration diagrams, in the photographing lens according to Example 1, various aberrations are favorably corrected from the infinity object focusing state to the near distance object focusing state, and the imaging lens has excellent imaging performance. You can see that

（第２実施例）
図３は、第２実施例に係る撮影レンズの構成を示す断面図である。
図３に示すように、本実施例に係る撮影レンズは、光軸に沿って物体側から順に、前側レンズ群ＧＦと、開口絞りＳと、後側レンズ群ＧＲとから構成されている。 Second Embodiment
FIG. 3 is a cross-sectional view showing the configuration of a taking lens according to a second example.
As shown in FIG. 3, the photographing lens according to the present embodiment includes, in order from the object side along the optical axis, a front lens group GF, an aperture stop S, and a rear lens group GR.

前側レンズ群ＧＦは、光軸に沿って物体側から順に、屈折力が極めて弱い保護ガラスＨＧと、両凸レンズＬ１１と、両凸レンズＬ１２と、両凹レンズＬ１３と、物体側に凸面を向けた負メニスカスレンズＬ１４と物体側に凸面を向けた正メニスカスレンズＬ１５との接合レンズと、物体側に凹面を向けた正メニスカスレンズＬ１６と両凹レンズＬ１７との接合レンズとから構成されている。 The front lens group GF includes, in order from the object side along the optical axis, a protective glass HG having extremely weak refractive power, a biconvex lens L11, a biconvex lens L12, a biconcave lens L13, and a negative meniscus surface convex on the object side It comprises a cemented lens of a lens L14 and a positive meniscus lens L15 having a convex surface facing the object side, and a cemented lens having a positive meniscus lens L16 having a concave surface facing the object side and a biconcave lens L17.

後側レンズ群ＧＲは、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群ＧＲａと、後側ａ部分レンズ群ＧＲａと空気間隔を隔てて配置された後側ｂ部分レンズ群ＧＲｂとから構成されている。
後側ａ部分レンズ群ＧＲａは、光軸に沿って物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ２１と両凸レンズＬ２２との接合レンズから構成されている。
後群ｂ部分レンズ群ＧＲｂは、光軸に沿って物体側から順に、両凸レンズＬ２３と両凹レンズＬ２４との接合レンズと、両凹レンズＬ２５と、両凸レンズＬ２６と、物体側に凹面を向けた負メニスカスレンズＬ２７と、両凸レンズＬ２８とから構成されている。 The rear lens group GR is disposed in order from the object side along the optical axis from the rear a partial lens group GRa having positive refractive power and the rear a partial lens group GRa with an air gap between them. and b a partial lens group GRb.
The rear side a partial lens group GRa is composed of, in order from the object side along the optical axis, a cemented lens of a negative meniscus lens L21 having a convex surface facing the object side and a biconvex lens L22.
The rear group b partial lens group GRb is a negative cemented lens of a biconvex lens L23 and a biconcave lens L24, a biconcave lens L25, a biconvex lens L26, and a concave surface facing the object side sequentially from the object side along the optical axis It comprises a meniscus lens L27 and a biconvex lens L28.

以上の構成のもと、本実施例に係る撮影レンズは、後側ａ部分レンズ群ＧＲａを合焦レンズ群Ｇｆとして物体側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が行われる。また、後群ｂ部分レンズ群ＧＲｂ中の、両凸レンズＬ２３と両凹レンズＬ２４との接合レンズと、両凹レンズＬ２５とを防振レンズ群として光軸と直交する方向の成分を含むように移動させることにより像面Ｉ上の像をシフトさせて、像ブレ発生時の像面補正、すなわち防振を行っている。 Based on the above configuration, in the imaging lens according to the present embodiment, focusing from an infinite distance object to a near distance object is achieved by moving the rear side a partial lens group GRa to the object side as the focusing lens group Gf. To be done. In addition, move the cemented lens of the biconvex lens L23 and the biconcave lens L24 in the rear group b partial lens group GRb and the biconcave lens L25 as a vibration reduction lens group so as to include a component in a direction orthogonal to the optical axis. Thus, the image on the image plane I is shifted, and image plane correction at the time of occurrence of image blur, that is, image stabilization is performed.

以下の表２に、本実施例に係る撮影レンズの諸元の値を掲げる。 Table 2 below presents values of specifications of the photographing lens according to the present example.

（表２）第２実施例
［全体諸元］
ｆ 489.998
ＦＮＯ 4.113
２ω 5.008
Ｙ 21.60
ＴＬ 426.000
ＢＦ 82.990

［面データ］
面番号ｒｄｎｄ νｄ
物面 ∞
1) 1200.37020 5.000 1.51680 63.88
2) 1199.78950 1.000
3) 260.38120 13.453 1.43385 95.25
4) -720.75070 76.693
5) 133.22420 14.689 1.43385 95.25
6) -445.53230 2.178
7) -416.78780 5.200 1.61266 44.46
8) 333.43020 68.917
9) 113.80420 3.500 1.69680 55.52
10) 48.12830 11.000 1.49782 82.57
11) 286.33870 24.362
12) -420.50250 3.900 1.92286 20.88
13) -205.04160 2.500 1.71388 55.48
14) 187.83670 23.418

15) ∞ (可変) (絞り)

16) 84.89220 1.800 1.76352 24.16
17) 42.15930 7.500 1.71603 40.65
18) -647.56120 (可変)

19) 191.49780 4.500 1.88476 33.10
20) -108.98170 1.800 1.72293 54.96
21) 48.05870 3.300
22) -160.34260 1.800 1.72916 54.61
23) 235.14740 5.423
24) 683.34780 4.500 1.50524 67.37
25) -62.84020 25.575
26) -56.28090 1.800 1.72916 54.61
27) -164.52330 1.500
28) 121.41330 5.000 1.61266 44.46
29) -468.68370 82.990
像面 ∞

［可変間隔データ］
無限遠至近撮影距離
forβ 489.998 -0.100
ｄ 0 ∞ 4638.551
ｄ15 17.009 5.109
ｄ18 4.500 16.401

［レンズ群データ］
群始面 f
GF 1 639.643
GR 16 939.875

［条件式対応値］
（１）ＴＬｆ／ＴＬ＝0.360
（２）ｈ１／ｈｆ＝3.152
（３）｜ｆｆ／ｆＲ｜＝0.975
（４）｜ｆｆ／ｆＦ＋ｆｆ／ｆＡ｜＝0.661
（５）νｄｐ＝23.88
（６）νｄｈ＝95.25
（７）ＴＬ／ｆ＝0.869
(Table 2) Second embodiment [Overall specifications]
f 489.998
FNO 4.113
2ω 5.008
Y 21.60
TL 426000
BF 82.990

[Plane data]
Face number r d nd d d
Object ∞
1) 1200.37020 5.000 1.51680 63.88
2) 1199.78950 1.000
3) 260.38120 13.453 1.43385 95.25
4) -720.75070 76.693
5) 133.22420 14.689 1.43385 95.25
6) -445.53230 2.178
7) -416.78780 5.200 1.61266 44.46
8) 333.43020 68.917
9) 113.80420 3.500 1.69680 55.52
10) 48.12830 11.000 1.49782 82.57
11) 286.33870 24.362
12) -420.50250 3.900 1.92286 20.88
13) -205.04160 2.500 1.71388 55.48
14) 187.83670 23.418

15) ∞ (variable) (aperture)

16) 84.89220 1.800 1.76352 24.16
17) 42.15930 7.500 1.71603 40.65
18) -647.56120 (variable)

19) 191.49780 4.500 1.88476 33.10
20) -108.98170 1.800 1.72293 54.96
21) 48.05870 3.300
22) -160.34260 1.800 1.72916 54.61
23) 235.14740 5.423
24) 683.34780 4.500 1.50524 67.37
25) -62.84020 25.575
26) -56.28090 1.800 1.72916 54.61
27) -164.52330 1.500
28) 121.41330 5.000 1.61266 44.46
29) -468.68370 82.990
Image plane ∞

[Variable interval data]
Infinity close distance
for β 489.998-0.100
d 0 ∞ 4638.551
d15 17.009 5.109
d18 4.500 16.401

[Lens group data]
Group front f
GF 1 639.643
GR 16 939.875

[Conditional expression corresponding value]
(1) TLf / TL = 0.360
(2) h1 / hf = 3.152
(3) ff / fR = 0.975
(4) | ff / fF + ff / fA | = 0.661
(5) dpdp = 23.88
(6) dh dh = 95.25
(7) TL / f = 0.869

図４は、第２実施例に係る撮影レンズの諸収差図であり、（ａ）は無限遠物体合焦時を示し、（ｂ）は近距離物体合焦時を示している。
各収差図から明らかなように、第２実施例に係る撮影レンズは、無限遠物体合焦状態から近距離物体合焦状態に亘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。
FIG. 4 is a diagram showing various aberrations of the photographing lens according to the second example, wherein (a) shows the time of focusing on an infinite distance object and (b) shows the time of focusing on a near distance object.
As is apparent from the respective aberration diagrams, in the imaging lens according to the second example, various aberrations are favorably corrected from the infinity object focusing state to the near distance object focusing state, and the imaging lens has excellent imaging performance. You can see that

（第３実施例）
図５は、第３実施例に係る撮影レンズの構成を示す断面図である。
図５に示すように、本実施例に係る撮影レンズは、光軸に沿って物体側から順に、前側レンズ群ＧＦと、開口絞りＳと、後側レンズ群ＧＲとから構成されている。 Third Embodiment
FIG. 5 is a cross-sectional view showing the configuration of a taking lens according to a third example.
As shown in FIG. 5, the photographing lens according to the present embodiment includes, in order from the object side along the optical axis, a front lens group GF, an aperture stop S, and a rear lens group GR.

前側レンズ群ＧＦは、光軸に沿って物体側から順に、屈折力が極めて弱い保護ガラスＨＧと、両凸レンズＬ１１と、両凸レンズＬ１２と、両凹レンズＬ１３と、物体側に凸面を向けた負メニスカスレンズＬ１４と両凸レンズＬ１５との接合レンズと、両凹レンズＬ１６と、物体側に凹面を向けた正メニスカスレンズＬ１７と物体側に凹面を向けた負メニスカスレンズＬ１８との接合レンズとから構成されている。 The front lens group GF includes, in order from the object side along the optical axis, a protective glass HG having extremely weak refractive power, a biconvex lens L11, a biconvex lens L12, a biconcave lens L13, and a negative meniscus surface convex on the object side It comprises a cemented lens of a lens L14 and a biconvex lens L15, a biconcave lens L16, and a cemented lens of a positive meniscus lens L17 having a concave surface facing the object side and a negative meniscus lens L18 having a concave surface facing the object side. .

後側レンズ群ＧＲは、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群ＧＲａと、後側ａ部分レンズ群ＧＲａと空気間隔を隔てて配置された後側ｂ部分レンズ群ＧＲｂとから構成されている。
後側ａ部分レンズ群ＧＲａは、光軸に沿って物体側から順に、両凸レンズＬ２１と物体側に凹面を向けた負メニスカスレンズＬ２２との接合レンズから構成されている。
後群ｂ部分レンズ群ＧＲｂは、光軸に沿って物体側から順に、物体側に凹面を向けた正メニスカスレンズＬ２３と両凹レンズＬ２４との接合レンズと、両凹レンズＬ２５と、物体側に凹面を向けた正メニスカスレンズＬ２６と、両凸レンズＬ２７と物体側に凹面を向けた負メニスカスレンズＬ２８との接合レンズとから構成されている。 The rear lens group GR is disposed in order from the object side along the optical axis from the rear a partial lens group GRa having positive refractive power and the rear a partial lens group GRa with an air gap between them. and b a partial lens group GRb.
The rear side a partial lens group GRa is composed of, in order from the object side along the optical axis, a cemented lens of a biconvex lens L21 and a negative meniscus lens L22 having a concave surface facing the object side.
The rear group b partial lens group GRb includes, in order from the object side along the optical axis, a cemented lens of a positive meniscus lens L23 having a concave surface facing the object side and a biconcave lens L24, a biconcave lens L25, and a concave surface on the object side It comprises a positive meniscus lens L26 directed, and a cemented lens of a biconvex lens L27 and a negative meniscus lens L28 concave on the object side.

以上の構成のもと、本実施例に係る撮影レンズは、後側ａ部分レンズ群ＧＲａを合焦レンズ群Ｇｆとして物体側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が行われる。また、後群ｂ部分レンズ群ＧＲｂ中の、物体側に凹面を向けた正メニスカスレンズＬ２３と両凹レンズＬ２４との接合レンズと、両凹レンズＬ２５とを防振レンズ群として光軸と直交する方向の成分を含むように移動させることにより像面Ｉ上の像をシフトさせて、像ブレ発生時の像面補正、すなわち防振を行っている。 Based on the above configuration, in the imaging lens according to the present embodiment, focusing from an infinite distance object to a near distance object is achieved by moving the rear side a partial lens group GRa to the object side as the focusing lens group Gf. To be done. Also, in the rear group b partial lens group GRb, a cemented lens of a positive meniscus lens L23 having a concave surface facing the object side and a biconcave lens L24, and a biconcave lens L25 as a vibration reduction lens group in a direction orthogonal to the optical axis. By moving so as to include a component, the image on the image plane I is shifted, and image plane correction at the time of image blur occurrence, that is, image stabilization is performed.

以下の表３に、本実施例に係る撮影レンズの諸元の値を掲げる。 Table 3 below presents values of specifications of the photographing lens according to the present example.

（表３）第３実施例
［全体諸元］
ｆ 587.991
ＦＮＯ 4.086
２ω 4.156
Ｙ 21.60
ＴＬ 494.803
空気換算ＴＬ 494.292
ＢＦ 120.500
空気換算ＢＦ 119.989

［面データ］
面番号ｒｄｎｄ νｄ
物面 ∞
1) ∞ 4.583 1.51680 63.88
2) ∞ 0.917
3) 200.00000 17.500 1.43385 95.23
4) -2000.00000 70.000
5) 190.47060 17.500 1.43385 95.23
6) -285.75020 2.000
7) -277.98670 6.000 1.61266 44.46
8) 532.09810 100.000
9) 79.35070 3.500 1.83481 42.73
10) 59.09100 10.500 1.49782 82.57
11) -832.06270 8.761
12) -307.18270 2.000 1.71999 50.27
13) 75.76250 6.500
14) -90.30490 3.500 1.84666 23.80
15) -60.43120 2.000 1.51742 52.20
16) -153.00970 24.539

17) ∞ (可変) (絞り)

18) 97.87300 4.500 1.48749 70.31
19) -200.00000 2.000 1.84666 23.80
20) -289.64820 (可変)

21) -606.87630 3.500 1.78472 25.64
22) -78.12600 2.000 1.49782 82.57
23) 79.44260 2.500
24) -101.51470 2.000 1.81600 46.59
25) 144.53630 5.000
26) -315.85810 3.500 1.61266 44.46
27) -113.09750 0.100
28) 212.06620 7.000 1.57957 53.74
29) -46.39380 1.800 1.84666 23.80
30) -70.94450 7.000

31) ∞ 1.500 1.51680 63.88
32) ∞ 112.000
像面 ∞

［可変間隔データ］
無限遠至近撮影距離
forβ 587.991 -0.100
ｄ 0 ∞ 5579.522
ｄ17 49.173 39.661
ｄ20 11.431 20.943

［レンズ群データ］
群始面 f
GF 1 881.338
GR 18 375.436

［条件式対応値］
（１）ＴＬｆ／ＴＬ＝0.335
（２）ｈ１／ｈｆ＝3.960
（３）｜ｆｆ／ｆＲ｜＝0.472
（４）｜ｆｆ／ｆＦ＋ｆｆ／ｆＡ｜＝0.624
（５）νｄｐ＝23.80
（６）νｄｈ＝95.23
（７）ＴＬ／ｆ＝0.842
(Table 3) Third Example [Overall Specifications]
f 587.991
FNO 4.086
2ω 4.156
Y 21.60
TL 494.803
Air conversion TL 494.292
BF 120.500
Air conversion BF 119.989

[Plane data]
Face number r d nd d d
Object ∞
1) ∞ 4.583 1.51680 63.88
2) 0.9 0.917
3) 200.00000 17.500 1.43385 95.23
4) -2000.00000 70.000
5) 190.47060 17.500 1.43385 95.23
6) -285.75020 2.000
7) -277.98670 6.000 1.61266 44.46
8) 532.09810 100.000
9) 79.35070 3.500 1.83481 42.73
10) 59.09100 10.500 1.49782 82.57
11) -832.06270 8.761
12) -307.18270 2.000 1.71999 50.27
13) 75.76250 6.500
14) -90.30490 3.500 1.84666 23.80
15) -60.43120 2.000 1.51742 52.20
16) -153.00970 24.539

17) ∞ (variable) (aperture)

18) 97.87300 4.500 1.48749 70.31
19) -200.00000 2.000 1.84666 23.80
20) -289.64820 (variable)

21) -606.87630 3.500 1.78472 25.64
22) -78.12600 2.000 1.49782 82.57
23) 79.44260 2.500
24) -101.51470 2.000 1.81600 46.59
25) 144.53630 5.000
26) -315.85810 3.500 1.61266 44.46
27) -113.09750 0.100
28) 212.06620 7.000 1.57957 53.74
29) -46.39380 1.800 1.84666 23.80
30) -70.94450 7.000

31) ∞ 1.500 1.51680 63.88
32) ∞ 112.000
Image plane ∞

[Variable interval data]
Infinity close distance
for β 587.991-0.100
d 0 ∞ 5579.522
d17 49.173 39.661
d20 11.431 20.943

[Lens group data]
Group front f
GF 1 881.338
GR 18 375.436

[Conditional expression corresponding value]
(1) TLf / TL = 0.335
(2) h1 / hf = 3.960
(3) | ff / fR | = 0.472
(4) ff / fF + ff / fA | = 0.624
(5) dp dp = 23.80
(6) dhdh = 95.23
(7) TL / f = 0.842

図６は、第３実施例に係る撮影レンズの諸収差図であり、（ａ）は無限遠物体合焦時を示し、（ｂ）は近距離物体合焦時を示している。
各収差図から明らかなように、第３実施例に係る撮影レンズは、無限遠物体合焦状態から近距離物体合焦状態に亘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。 FIG. 6 is a diagram showing various aberrations of the photographing lens according to the third example, wherein (a) shows the time of focusing on an infinite distance object, and (b) shows the time of focusing on a near distance object.
As apparent from the respective aberration diagrams, in the photographing lens according to the third example, various aberrations are favorably corrected from the infinity object focusing state to the near distance object focusing state, and the imaging lens has excellent imaging performance. You can see that

以上説明したように、上記各実施例によれば、小型で高い光学性能を有する撮影レンズを実現できる。特に焦点距離が長くＦナンバーの明るい光学系において、無限遠物体合焦状態から近距離物体合焦状態まで優れた光学性能を維持しつつ、広範囲な撮影範囲に対応し得る大口径比の内焦撮影レンズを実現することができる。
なお、上記各実施例は本実施形態の一具体例を示しているものであり、本実施形態はこれらに限定されるものではない。以下の内容は、本実施形態の撮影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。 As described above, according to each of the above embodiments, it is possible to realize a compact and high-performance imaging lens. In particular, in an optical system with a long focal length and a bright F number, an internal focusing with a large aperture ratio that can correspond to a wide imaging range while maintaining excellent optical performance from an infinity object focusing state to a near distance object focusing state. A photographing lens can be realized.
Note that the above-described examples show one specific example of the present embodiment, and the present embodiment is not limited to these. The following contents can be adopted appropriately as long as the optical performance of the imaging lens of the present embodiment is not impaired.

本実施形態の撮影レンズの数値実施例として２群構成のものを示したが、例えば３群等の他の群構成にも適用可能である。また、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。なお、レンズ群とは、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 two-group configuration is shown as a numerical example of the photographing lens of the present embodiment, the present invention is also applicable to other group configurations such as, for example, three-group. Also, the lens or lens group may be added to the most object side, or the lens or lens group may be added to the most image side. The lens group indicates a portion having at least one lens separated by an air gap.

また、本実施形態の撮影レンズにおいて、単独または複数のレンズ群、または部分レンズ群を光軸方向に移動させて、無限遠物体から近距離物体への合焦を行う合焦レンズ群としても良い。合焦レンズ群はオートフォーカスにも適用でき、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。特に後側レンズ群ＧＲの少なくとも一部を合焦レンズ群とするのが好ましい。 Further, in the photographing lens of the present embodiment, a single or a plurality of lens groups or a partial lens group may be moved in the optical axis direction to form a focusing lens group for focusing from an infinite distance object to a near distance object. . The focusing lens group can also be applied to autofocus, and is also suitable for driving by a motor for autofocus, such as an ultrasonic motor. In particular, it is preferable that at least a part of the rear lens group GR be a focusing lens group.

また、本実施形態の撮影レンズにおいて、レンズ群または部分レンズ群を光軸と垂直な成分を持つように移動させ、または光軸を含む方向に回転移動（揺動）させて、手ブレ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良い。特に後側レンズ群ＧＲの少なくとも一部を防振レンズ群とするのが好ましい。 Further, in the photographing lens of the present embodiment, the lens group or the partial lens group is moved so as to have a component perpendicular to the optical axis, or is rotationally moved (rocked) in a direction including the optical axis to cause camera shake. It may be a vibration reduction lens group that corrects image blur. In particular, at least a part of the rear lens group GR is preferably used as a vibration reduction lens group.

また、本実施形態の撮影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。 Further, the lens surface of the lens constituting the photographing lens of the present embodiment may be a spherical surface, a flat surface, or an aspheric surface. When the lens surface is spherical or flat, it is preferable because lens processing and assembly adjustment can be facilitated, and deterioration of optical performance due to lens processing and assembly adjustment errors can be prevented. In addition, even when the image plane shifts, it is preferable because the deterioration of the imaging performance is small. When the lens surface is aspheric, any of aspheric aspheric surfaces by grinding, a glass mold aspheric surface formed by shaping a glass into aspheric surface shape, or a composite aspheric surface formed by forming a resin on a glass surface into an aspheric surface 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、本実施形態の撮影レンズにおいて、開口絞りは前側レンズＧＦと後側レンズ群ＧＲとの間に配置されるのが好ましいが、開口絞りとして部材を設けずにレンズの枠でその役割を代用する構成としてもよい。 In the photographing lens of the present embodiment, the aperture stop is preferably disposed between the front lens GF and the rear lens group GR, but the lens frame substitutes the role without providing a member as the aperture stop. It may be configured to

また、本実施形態の撮影レンズを構成するレンズのレンズ面には、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 addition, on the lens surface of the lens constituting the photographing lens of this embodiment, in order to reduce flare and ghost and to achieve high optical performance with high contrast, an antireflective film having high transmittance in a wide wavelength range is used. It may be applied.

次に、本実施形態に係る撮影レンズを備えたカメラを図７に基づいて説明する。
図７は、本実施形態に係る撮影レンズを備えたカメラの構成を示す図である。
図７に示すようにカメラ１は、撮影レンズ２として上記第１実施例に係る撮影レンズを備えたデジタル一眼レフカメラである。
図７に示すデジタル一眼レフカメラ１において、図示しない物体（被写体）からの光は、撮影レンズ２で集光されて、クイックリターンミラー３を介して集点板５に結像される。そして、集点板５に結像された光は、ペンタプリズム７中で複数回反射されて接眼レンズ９へと導かれる。これにより、撮影者は、物体（被写体）像を接眼レンズ９を介して正立像として観察することができる。 Next, a camera provided with a photographing lens according to the present embodiment will be described based on FIG.
FIG. 7 is a view showing a configuration of a camera provided with a photographing lens according to the present embodiment.
As shown in FIG. 7, the camera 1 is a digital single-lens reflex camera provided with the photographing lens according to the first embodiment as the photographing lens 2.
In the digital single lens reflex camera 1 shown in FIG. 7, light from an object (a subject) (not shown) is condensed by the photographing lens 2 and is focused on the focusing plate 5 via the quick return mirror 3. Then, the light imaged on the focusing plate 5 is reflected a plurality of times in the pentaprism 7 and is guided to the eyepiece lens 9. Thereby, the photographer can observe an object (subject) image as an erect image through the eyepiece lens 9.

撮影者によって図示しないレリーズボタンが押されると、クイックリターンミラー３が光路外へ退避し、撮影レンズ２で集光された物体（被写体）の光は撮像素子１１上に被写体像を形成する。これにより、物体からの光は、撮像素子１１により撮像され、物体画像としてメモリ（図示省略）に記憶される。このようにして、撮影者はカメラ１による物体の撮影を行うことができる。 When the photographer presses a release button (not shown), the quick return mirror 3 retracts out of the optical path, and the light of an object (subject) condensed by the photographing lens 2 forms an object image on the image sensor 11. Thereby, the light from the object is imaged by the imaging device 11 and stored as an object image in a memory (not shown). Thus, the photographer can shoot an object with the camera 1.

ここで、本カメラ１に撮影レンズ２として搭載した上記第１実施例に係る撮影レンズは、小型で高い光学性能を有する撮影レンズである。したがって本カメラ１は、高い光学性能を備えたカメラである。なお、上記第２実施例または第３実施例に係る撮影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、カメラ１は、撮影レンズ２を着脱可能に保持するものでも良く、撮影レンズ２と一体に成形されるものでも良い。また、カメラ１は、クイックリターンミラー等を有さないカメラでも良い。 Here, the photographing lens according to the first embodiment mounted on the present camera 1 as the photographing lens 2 is a small-sized photographing lens having high optical performance. Therefore, the camera 1 is a camera with high optical performance. Even if a camera having the photographing lens according to the second or third embodiment mounted as the photographing lens 2 is configured, the same effect as that of the camera 1 can be obtained. Further, the camera 1 may be one that detachably holds the photographing lens 2, or may be one that is integrally formed with the photographing lens 2. Further, the camera 1 may be a camera not having a quick return mirror or the like.

次に、本実施形態に係る撮影レンズの製造方法について説明する。図８は、本実施形態に係る撮影レンズの製造方法の概略を示す図である。 Next, a method of manufacturing the photographing lens according to the present embodiment will be described. FIG. 8 is a view showing an outline of a method of manufacturing a photographing lens according to the present embodiment.

本実施形態に係る撮影レンズの製造方法は、光軸に沿って物体側から順に、複数のレンズで構成された前側レンズ群と、開口絞りと、複数のレンズで構成された後側レンズ群とで構成された撮影レンズの製造方法であって、図８に示すように、以下の各ステップＳ１〜Ｓ３を含むものである。
ステップＳ１：後側レンズ群を、光軸に沿って物体側から順に、正の屈折力を有する後側ａ部分レンズ群と、後側ａ部分レンズ群と空気間隔を隔てて配置された後側ｂ部分レンズ群とから構成し、後側ａ部分レンズ群を３枚以下のレンズで構成する。
ステップＳ２：無限遠物体から近距離物体へ合焦する際、後側ａ部分レンズ群が合焦レンズ群として光軸に沿って移動するように構成する。
ステップＳ３：以下の条件式（１）、（２）を満足するように構成する。
（１）０．１０＜ＴＬｆ／ＴＬ＜０．４０
（２）３．０＜ｈ１／ｈｆ
ただし、
ＴＬｆ：前記合焦レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ＴＬ：前記前側レンズ群の最も物体側のレンズ面から像面までの光軸上の距離
ｈ１：前記前側レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ
ｈｆ：前記合焦レンズ群の最も物体側のレンズ面を通る、開放Ｆ値を決める無限遠物体からの平行光束の光軸からの高さ In the method of manufacturing an imaging lens according to the present embodiment, a front lens group including a plurality of lenses, an aperture stop, and a rear lens group including a plurality of lenses are arranged in order from the object side along the optical axis It is a manufacturing method of the photography lens constituted by, and as shown in Drawing 8, following each steps S1-S3 are included.
Step S1: The rear lens group is arranged in order from the object side along the optical axis from the object side to the rear a partial lens group having positive refractive power, and the rear a partial lens group at a distance from the air. It comprises the b partial lens group, and the rear a partial lens group comprises three or less lenses.
Step S2: When focusing from an infinite distance object to a near distance object, the rear side a partial lens unit is configured to move along the optical axis as a focusing lens unit.
Step S3: The following conditional expressions (1) and (2) are satisfied.
(1) 0.10 <TLf / TL <0.40
(2) 3.0 <h1 / hf
However,
TLf: distance on the optical axis from the lens surface closest to the object side to the image plane of the focusing lens group TL: distance on the optical axis from the lens surface closest to the object side to the image plane h1: above The height from the optical axis of a collimated light beam from an infinite distance object that determines the open F-number, which passes through the lens surface closest to the object side in the front lens group hf: The lens surface that faces the most object side of the focusing lens group The height from the optical axis of the parallel luminous flux from an infinitely distant object which determines the F value

斯かる本実施形態の撮影レンズの製造方法によれば、小型で高い光学性能を有する撮影レンズを製造することができる。特に焦点距離が長くＦナンバーの明るい光学系において、無限遠物体合焦状態から近距離物体合焦状態まで優れた光学性能を維持しつつ、広範囲な撮影範囲に対応し得る大口径比の内焦撮影レンズを製造することができる。 According to the manufacturing method of the photographing lens of the present embodiment, it is possible to manufacture a small-sized photographing lens having high optical performance. In particular, in an optical system with a long focal length and a bright F number, an internal focusing with a large aperture ratio that can correspond to a wide imaging range while maintaining excellent optical performance from an infinity object focusing state to a near distance object focusing state. Taking lenses can be manufactured.

ＧＦ前側レンズ群
ＧＲ後側レンズ群
ＧＲａ後側ａ部分レンズ群
ＧＲｂ後側ｂ部分レンズ群
Ｇｆ合焦レンズ群
Ｓ開口絞り
Ｉ像面
１光学装置
２撮影レンズ
３クイックリターンミラー
５集点板
７ペンタプリズム
９接眼レンズ
１１撮像素子
GF front lens group GR rear side lens group GRa rear side a partial lens group GRb rear side b partial lens group Gf focusing lens group S aperture stop I image plane 1 optical device 2 photographing lens 3 quick return mirror 5 focusing plate 7 penta Prism 9 Eyepiece 11 Imager

Claims

The front lens unit including a plurality of lenses, the aperture stop, and the rear lens unit including a plurality of lenses in this order from the object side along the optical axis,
The rear lens group is arranged in order from the object side along the optical axis from the rear a partial lens group having positive refractive power and the rear a partial lens group at a rear side b. Composed of a partial lens group,
The rear side a lens group is composed of three or less lenses,
When focusing from an infinite distance object to a close distance object, the rear side a lens group moves as a focusing lens group along the optical axis,
Photographing lens which satisfies the following conditional expressions.
0.10 <TLf / TL <0.40
3.0 <h1 / hf
TL / f <1.2
However,
TLf: distance on the optical axis from the lens surface closest to the object side to the image plane of the focusing lens group TL: distance on the optical axis from the lens surface closest to the object side to the image plane h1: above The height from the optical axis of a collimated light beam from an infinite distance object that determines the open F-number, which passes through the lens surface closest to the object side in the front lens group hf: The lens surface that faces the most object side of the focusing lens group The height from the optical axis of the parallel luminous flux from an infinitely distant object which determines the F value
f: focal length of the whole shooting lens system

The front lens unit including a plurality of lenses, the aperture stop, and the rear lens unit including a plurality of lenses in this order from the object side along the optical axis,
The rear lens group is arranged in order from the object side along the optical axis from the rear a partial lens group having positive refractive power and the rear a partial lens group at a rear side b. Composed of a partial lens group,
The rear side a lens group is composed of three or less lenses,
When focusing from an infinite distance object to a close distance object, the rear side a lens group moves as a focusing lens group along the optical axis,
The following conditional expressions are satisfied ,
0.10 <TLf / TL <0.40
3.0 <h1 / hf
However,
TLf: distance on the optical axis from the lens surface closest to the object side to the image plane of the focusing lens group TL: distance on the optical axis from the lens surface closest to the object side to the image plane h1: above The height from the optical axis of a collimated light beam from an infinite distance object that determines the open F value, which passes through the lens surface closest to the object side in the front lens group hf The height from the optical axis of the parallel luminous flux from an infinitely distant object which determines the F value
An imaging lens having at least one lens in which the front lens group satisfies the following conditional expression.
85 <dhdh
However,
dh dh: Abbe's number for the d-line of the glass material of the at least one lens in the front lens group

The front lens unit including a plurality of lenses, the aperture stop, and the rear lens unit including a plurality of lenses in this order from the object side along the optical axis,
The rear lens group is arranged in order from the object side along the optical axis from the rear a partial lens group having positive refractive power and the rear a partial lens group at a rear side b. Composed of a partial lens group,
The rear side a lens group is composed of three or less lenses,
When focusing from an infinite distance object to a close distance object, the rear side a lens group moves as a focusing lens group along the optical axis,
Photographing lens which satisfies the following conditional expressions.
0.10 <TLf / TL <0.40
3.0 <h1 / hf
| Ff / fF + ff / fA | <0.69
However,
TLf: distance on the optical axis from the lens surface closest to the object side to the image plane of the focusing lens group TL: distance on the optical axis from the lens surface closest to the object side to the image plane h1: above The height from the optical axis of a collimated light beam from an infinite distance object that determines the open F-number, which passes through the lens surface closest to the object side in the front lens group hf: The lens surface that faces the most object side of the focusing lens group The height from the optical axis of the parallel luminous flux from an infinitely distant object which determines the F value
ff: focal length of the focusing lens group
fF: synthetic focal length in the infinite object focusing state of the whole lens located on the object side of the focusing lens group
fA: combined focal length in an infinite distance object focusing state of the focusing lens group and the entire lens on the object side of the focusing lens group

The front lens unit including a plurality of lenses, the aperture stop, and the rear lens unit including a plurality of lenses in this order from the object side along the optical axis,
The rear lens group is arranged in order from the object side along the optical axis from the rear a partial lens group having positive refractive power and the rear a partial lens group at a rear side b. Composed of a partial lens group,
The rear side a lens group is composed of three or less lenses,
When focusing from an infinite distance object to a close distance object, the rear side a lens group moves as a focusing lens group along the optical axis,
The following conditional expressions are satisfied ,
0.10 <TLf / TL <0.40
3.0 <h1 / hf
However,
TLf: distance on the optical axis from the lens surface closest to the object side to the image plane of the focusing lens group TL: distance on the optical axis from the lens surface closest to the object side to the image plane h1: above The height from the optical axis of a collimated light beam from an infinite distance object that determines the open F-number, which passes through the lens surface closest to the object side in the front lens group hf: The lens surface that faces the most object side of the focusing lens group The height from the optical axis of the parallel luminous flux from an infinitely distant object which determines the F value
The front lens group has at least one lens satisfying the following conditional expression,
dp dp ≦ 23.80
However,
dpdp: Abbe's number for the d-line of the glass material of the at least one lens in the front lens group
An imaging lens having at least one lens in which the front lens group satisfies the following conditional expression.
80 <dhdh
However,
dh dh: Abbe's number for the d-line of the glass material of the at least one lens in the front lens group

The front lens unit including a plurality of lenses, the aperture stop, and the rear lens unit including a plurality of lenses in this order from the object side along the optical axis,
The rear lens group is arranged in order from the object side along the optical axis from the rear a partial lens group having positive refractive power and the rear a partial lens group at a rear side b. Composed of a partial lens group,
The rear side a lens group is composed of three or less lenses,
When focusing from an infinite distance object to a close distance object, the rear side a lens group moves as a focusing lens group along the optical axis,
Photographing lens which satisfies the following conditional expressions.
0.318 ≦ TLf / TL <0.40
3.0 <h1 / hf
0.01 <| ff / fR | <1.00
However,
TLf: distance on the optical axis from the lens surface closest to the object side to the image plane of the focusing lens group TL: distance on the optical axis from the lens surface closest to the object side to the image plane h1: above The height from the optical axis of a collimated light beam from an infinite distance object that determines the open F-number, which passes through the lens surface closest to the object side in the front lens group hf: The lens surface that faces the most object side of the focusing lens group The height from the optical axis of the parallel luminous flux from an infinitely distant object which determines the F value
ff: focal length of the focusing lens group
fR: synthetic focal length in the infinite object focusing state of the whole lens located on the image side of the focusing lens group

The imaging lens according to any one of claims 1 to 4, which satisfies the following conditional expression.
0.01 <| ff / fR |
However,
ff: Focal length of the focusing lens group fR: Synthetic focal length in the infinite object focusing state of the whole lens located on the image side of the focusing lens group

The imaging lens according to any one of claims 1, 2, 4, and 5 satisfying the following conditional expression.
| Ff / fF + ff / fA | <0.69
However,
ff: focal length of the focusing lens group fF: combined focal length of the whole lens on the object side of the focusing lens group in an infinite distance object focusing state fA: from the focusing lens group and the focusing lens group Combined focal length in an infinite object focusing state with the entire lens on the object side

The photographing lens according to any one of claims 1, 2 , 3 and 5 , wherein the front lens group has at least one lens satisfying the following conditional expression.
dp dp <35
However,
dpdp: Abbe's number for the d-line of the glass material of the at least one lens in the front lens group

The imaging lens according to any one of claims 2 to 5 , which satisfies the following conditional expression.
TL / f <1.2
However,
TL: Distance on the optical axis from the lens surface closest to the object side of the front lens group to the image plane f: Focal length of the entire photographing lens system

The photographing lens according to claim 4 , wherein the at least one lens has a positive refractive power.

The photographing lens according to any one of claims 1 to 10 , wherein the plurality of lenses constituting the front lens group is 10 or less.

The photographing lens according to any one of claims 1 to 11 , wherein the plurality of lenses constituting the front lens group is six or more.

Any one of 12 claims 1 image capable of shifting in the image plane by moving in a direction including a component perpendicular part of lens groups in the rear lens group and the optical axis The shooting lens described in Item.

An optical apparatus comprising the photographing lens according to any one of claims 1 to 13 .