JP2008015251A - Zoom lens and imaging apparatus having the same - Google Patents
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本発明はズームレンズに関し、例えば写真用カメラや、ビデオカメラ、デジタルスチルカメラ等の撮影光学系として好適なものである。 The present invention relates to a zoom lens, and is suitable for a photographic optical system such as a photographic camera, a video camera, and a digital still camera.
バックフォーカス（無限遠物点におけるレンズ最終面から近軸像面までの距離）が比較的長く、高ズーム比のズームレンズとして、最も物体側に正の屈折力のレンズ群を配置したポジティブリード型のズームレンズが知られている。 A positive lead type lens that has a relatively long back focus (distance from the final lens surface to the paraxial image plane at an infinite object point) and a lens group with positive refractive power closest to the object as a zoom lens with a high zoom ratio Zoom lenses are known.
このうち、物体側より順に、正、負、正、負、正の屈折力の５つのレンズ群で構成される、５群ズームレンズが知られている（特許文献２）。 Among these, a five-group zoom lens is known that includes five lens groups having positive, negative, positive, negative, and positive refractive power in order from the object side (Patent Document 2).
又、物体側より順に、正、負、正、正、負、正の屈折力の６つのレンズ群で構成される、６群ズームレンズが知られている（特許文献３）。 Further, a six-group zoom lens is known that is composed of six lens groups of positive, negative, positive, positive, negative, and positive refractive power in order from the object side (Patent Document 3).
一方、ズームレンズに手ぶれなどの偶発的な振動が伝わると撮影画像にブレが生じる。従来、この偶発的な振動による画像のぶれを補償する機構（防振機構）を具備し、高画質化を図ったズームレンズが種々と提案されている。 On the other hand, when an accidental vibration such as camera shake is transmitted to the zoom lens, the photographed image is blurred. Conventionally, various zoom lenses have been proposed which have a mechanism (anti-vibration mechanism) that compensates for image blurring due to this accidental vibration and achieves high image quality.
このうち、物体側から像側へ順に、正、負、正、正の屈折力のレンズ群より成る４群ズームレンズにおいて、第３レンズ群の一部のレンズ群を光軸と垂直方向に移動させることにより像ぶれ補正（防振）を行うズームレンズが知られている（特許文献４）。 Among these, in the four-unit zoom lens including positive, negative, positive, and positive refractive power lens units in order from the object side to the image side, a part of the third lens unit is moved in a direction perpendicular to the optical axis. There is known a zoom lens that performs image blur correction (anti-vibration).
又、物体側から像側へ順に、正、負、正、正、負の屈折力のレンズ群より成る５群ズームレンズにおいて、第２レンズ群の一部のレンズ群を光軸と垂直方向に移動させて像ブレを補正するズームレンズが知られている（特許文献５）。 Further, in the five-unit zoom lens including lens units having positive, negative, positive, positive, and negative refractive powers in order from the object side to the image side, a part of the second lens unit is set in a direction perpendicular to the optical axis. A zoom lens that corrects image blur by moving it is known (Patent Document 5).
又、物体側から像側へ順に、正、負、正、負、正の屈折力のレンズ群より成る５群ズームレンズにおいて、第４レンズ群を光軸と垂直方向に移動させて画像のぶれを補償するズームレンズが知られている（特許文献６）。
近年、デジタル一眼レフカメラ用のズームレンズは高ズーム比化と撮影される像の高画質化、そして所定の長さのバックフォーカスを有することが強く求められている。 In recent years, zoom lenses for digital single-lens reflex cameras are strongly required to have a high zoom ratio, high image quality of captured images, and a back focus of a predetermined length.
一般にズームレンズにおいて、各レンズ群の屈折力を強めれば所定のズーム比を得るための各レンズ群の移動量が少なくなる為、レンズ全長の短縮化を図りつつ、高ズーム比化が容易となる。 In general, in a zoom lens, if the refractive power of each lens group is increased, the amount of movement of each lens group for obtaining a predetermined zoom ratio is reduced, so that it is easy to achieve a high zoom ratio while shortening the overall lens length. Become.
しかしながら単に各レンズ群の屈折力を強めると、ズーミング（変倍）に伴う収差変動が大きくなり、特に高ズーム比化を図る際には全ズーム範囲にわたり良好なる光学性能を得るのが難しくなってくる。 However, simply increasing the refracting power of each lens group increases aberration fluctuations associated with zooming, and it is difficult to obtain good optical performance over the entire zoom range, especially when increasing the zoom ratio. come.
また、十分な長さのバックフォーカスを確保しつつ高ズーム比化を図ると、レンズ系全体が広角端においてレトロフォーカス型が強くなり易く、広角端における倍率色収差が悪化してくる。 If a high zoom ratio is achieved while ensuring a sufficiently long back focus, the retrofocus type tends to become strong at the wide-angle end of the entire lens system, and the lateral chromatic aberration at the wide-angle end becomes worse.
一方、ズームレンズの一部のレンズ群を防振レンズ群とし、光軸に対して垂直方向に平行偏心させて画像ぶれの補正を行うズームレンズにおいては、比較的容易に画像ぶれを補正することができる利点がある。 On the other hand, in a zoom lens that corrects image blur by using a part of the lens group of the zoom lens as an anti-vibration lens group and decentering in the direction perpendicular to the optical axis, it is relatively easy to correct the image blur. There is an advantage that can be.
しかしながらズームレンズのレンズ構成及び防振のために移動させる防振レンズ群のレンズ構成が適切でないと、防振時において、偏心収差の発生量が多くなり、光学性能が低下してくる。 However, if the lens configuration of the zoom lens and the lens configuration of the anti-vibration lens group to be moved for anti-vibration are not appropriate, the amount of decentration aberration generated during the anti-vibration operation increases, and the optical performance deteriorates.
特に偏心色収差の発生が多いと防振時の光学性能が大きく低下してくる。 In particular, when the occurrence of decentration chromatic aberration is large, the optical performance at the time of image stabilization is greatly deteriorated.
このため、防振機能を有するズームレンズでは、全体のレンズ構成や防振用のレンズ群の構成を適切に設定することが重要になってくる。 For this reason, in a zoom lens having an image stabilization function, it is important to appropriately set the entire lens configuration and the configuration of the lens group for image stabilization.
本発明は、高ズーム比で所定の長さのバックフォーカスを有し、しかも全ズーム範囲にわたり高い光学性能を有したズームレンズ及びそれを有する撮像装置の提供を目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a zoom lens having a back focus of a predetermined length at a high zoom ratio and having high optical performance over the entire zoom range, and an image pickup apparatus having the zoom lens.
この他、本発明は振動補償（防振）の為の機構を具備し、振動補償時に良好な画像を得ることができる防振機能を有したズームレンズの提供を目的とする。 Another object of the present invention is to provide a zoom lens that has a mechanism for vibration compensation (anti-vibration) and has an anti-vibration function capable of obtaining a good image during vibration compensation.
本発明のズームレンズは、
◎物体側より像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、ズーミングに際して移動する１群以上のレンズ群を有し、全ズーム範囲にて全体として正の屈折力の中間レンズユニット、正の屈折力の後方レンズ群から構成され、広角端に対し、望遠端での該第１レンズ群と第２レンズ群との間隔が広く、該第２レンズ群と該中間レンズユニットとの間隔が狭く、該中間レンズユニットと後方レンズ群との間隔が狭くなるように各レンズ群が移動するズームレンズであって、
該中間レンズユニットは、光軸に対し垂直方向の成分を持つように移動して全系が形成する像を光軸と垂直方向に変位させる負の屈折力のレンズ部を有しており、
該後方レンズ群の焦点距離をｆｒｐ、
該後方レンズ群中の１つの正レンズの材料のアッベ数をνｄｐ、
望遠端におけるズームレンズの焦点距離をｆｔ
とするとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３
７２＜νｄｐ＜９７
なる条件を満足することを特徴としている。
The zoom lens of the present invention is
◎ In order from the object side to the image side, it has a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and one or more lens units that move during zooming. An intermediate lens unit having a positive refractive power and a rear lens group having a positive refractive power, and the distance between the first lens group and the second lens group at the telephoto end is wider than the wide-angle end, and the second lens A zoom lens in which each lens group moves so that a distance between the group and the intermediate lens unit is narrow, and a distance between the intermediate lens unit and the rear lens group is narrow,
The intermediate lens unit includes a lens unit having a negative refractive power that moves so as to have a component perpendicular to the optical axis and displaces an image formed by the entire system in a direction perpendicular to the optical axis.
The focal length of the rear lens group is frp,
The Abbe number of the material of one positive lens in the rear lens group is νdp,
Ft is the focal length of the zoom lens at the telephoto end
And when
0.05 <frp / ft <0.3
72 <νdp <97
It is characterized by satisfying the following conditions.
◎物体側より像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、ズーミングに際して移動する１群以上のレンズ群を有し、全ズーム範囲にて全体として正の屈折力の中間レンズユニット、正の屈折力の後方レンズ群から構成され、広角端に対し、望遠端での該第１レンズ群と第２レンズ群との間隔が広く、該第２レンズ群と該中間レンズユニットとの間隔が狭く、該中間レンズユニットと後方レンズ群との間隔が狭くなるように各レンズ群が移動するズームレンズであって、
広角端から望遠端へのズーミングにおける該後方レンズ群の光軸方向の移動量をＭｒｐ、
該後方レンズ群の焦点距離をｆｒｐ、
該後方レンズ群中の１つの正レンズの材料のアッベ数をνｄｐ、
望遠端におけるズームレンズの焦点距離をｆｔ
とするとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３
７２＜νｄｐ＜９７
−０．３＜Ｍｒｐ／ｆｔ＜−０．０５
なる条件を満足することを特徴としている。
◎ In order from the object side to the image side, it has a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and one or more lens units that move during zooming. An intermediate lens unit having a positive refractive power and a rear lens group having a positive refractive power, and the distance between the first lens group and the second lens group at the telephoto end is wider than the wide-angle end, and the second lens A zoom lens in which each lens group moves so that a distance between the group and the intermediate lens unit is narrow, and a distance between the intermediate lens unit and the rear lens group is narrow,
The amount of movement of the rear lens group in the optical axis direction during zooming from the wide-angle end to the telephoto end is Mrp,
The focal length of the rear lens group is frp,
The Abbe number of the material of one positive lens in the rear lens group is νdp,
Ft is the focal length of the zoom lens at the telephoto end
And when
0.05 <frp / ft <0.3
72 <νdp <97
−0.3 <Mrp / ft <−0.05
It is characterized by satisfying the following conditions.
◎物体側より像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、ズーミングに際して移動する１群以上のレンズ群から構成され、全ズーム範囲にて全体として正の屈折力の中間レンズユニット、正の屈折力の後方レンズ群から構成され、広角端に対し、望遠端での該第１レンズ群と第２レンズ群との間隔が広く、該第２レンズ群と該中間レンズユニットとの間隔が狭く、該中間レンズユニットと後方レンズ群との間隔が狭くなるように各レンズ群が移動するズームレンズであって、
該中間レンズユニットは、物体側から像側へ順に正の屈折力の第ｒｐ１レンズ群、負の屈折力の第ｒｎ１レンズ群を有し、
該第ｒｎ１レンズ群は光軸に対し垂直方向の成分を持つように移動して全系が形成する像を光軸と垂直方向に変位させる負の屈折力の第Ｇｉｓレンズ部を有しており、
該後方レンズ群の焦点距離をｆｒｐ、
該第Ｇｉｓレンズ部の焦点距離をｆｉｓ、
望遠端におけるズームレンズの焦点距離をｆｔ
とするとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３
−０．４＜ｆｉｓ／ｆｔ＜−０．１
−０．３＜Ｍｒｐ／ｆｔ＜−０．０５
なる条件を満足することを特徴としている。
In order from the object side to the image side, the first lens unit having a positive refractive power, the second lens unit having a negative refractive power, and one or more lens units that move during zooming. An intermediate lens unit having a positive refractive power and a rear lens group having a positive refractive power, and the distance between the first lens group and the second lens group at the telephoto end is wider than the wide-angle end, and the second lens A zoom lens in which each lens group moves so that a distance between the group and the intermediate lens unit is narrow, and a distance between the intermediate lens unit and the rear lens group is narrow,
The intermediate lens unit has an rp1 lens group having a positive refractive power and an rn1 lens group having a negative refractive power in order from the object side to the image side.
The rn1 lens unit has a negative refracting power Gis lens portion that moves so as to have a component perpendicular to the optical axis and displaces an image formed by the entire system in a direction perpendicular to the optical axis. ,
The focal length of the rear lens group is frp,
The focal length of the first Gis lens unit is fis,
Ft is the focal length of the zoom lens at the telephoto end
And when
0.05 <frp / ft <0.3
−0.4 <fis / ft <−0.1
−0.3 <Mrp / ft <−0.05
It is characterized by satisfying the following conditions.
◎物体側より像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、ズーミングに際して移動する１群以上のレンズ群から構成され、全ズーム範囲にて全体として正の屈折力の中間レンズユニット、正の屈折力の後方レンズ群から構成され、広角端に対し、望遠端での該第１レンズ群と第２レンズ群との間隔が広く、該第２レンズ群と該中間レンズユニットとの間隔が狭く、該中間レンズユニットと後方レンズ群との間隔が狭くなるように各レンズ群が移動するズームレンズであって、
該中間レンズユニットは、物体側から像側へ順に正の屈折力の第ｒｐ１レンズ群、負の屈折力の第ｒｎ１１レンズ群、負の屈折力の第ｒｎ１２レンズ群を有し、該第ｒｎ１１レンズ群は、光軸に対し垂直方向の成分を持つように移動して全系が形成する像を光軸と垂直方向に変位させており、
該後方レンズ群の焦点距離をｆｒｐ、
該第ｒｎ１１レンズ群の焦点距離をｆｒｎ１１、
望遠端におけるズームレンズの焦点距離をｆｔ
とするとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３
−０．４＜ｆｒｎ１１／ｆｔ＜−０．１
なる条件を満足することを特徴としている。
In order from the object side to the image side, the first lens unit having a positive refractive power, the second lens unit having a negative refractive power, and one or more lens units that move during zooming. An intermediate lens unit having a positive refractive power and a rear lens group having a positive refractive power, and the distance between the first lens group and the second lens group at the telephoto end is wider than the wide-angle end, and the second lens A zoom lens in which each lens group moves so that a distance between the group and the intermediate lens unit is narrow, and a distance between the intermediate lens unit and the rear lens group is narrow,
The intermediate lens unit includes, in order from the object side to the image side, an rp1 lens group having a positive refractive power, an rn11 lens group having a negative refractive power, and an rn12 lens group having a negative refractive power, and the rn11 lens The group moves so as to have a component perpendicular to the optical axis and displaces the image formed by the entire system in the direction perpendicular to the optical axis.
The focal length of the rear lens group is frp,
The focal length of the rn11 lens group is frn11,
Ft is the focal length of the zoom lens at the telephoto end
And when
0.05 <frp / ft <0.3
−0.4 <frn11 / ft <−0.1
It is characterized by satisfying the following conditions.
本発明によれば、高ズーム比で所定の長さのバックフォーカスを有し、しかも全ズーム範囲にわたり高い光学性能を有したズームレンズが得られる。 According to the present invention, it is possible to obtain a zoom lens which has a high zoom ratio, a back focus of a predetermined length, and high optical performance over the entire zoom range.
以下、本発明のズームレンズ及びそれを有する撮像装置の実施例について説明する。 Embodiments of the zoom lens of the present invention and an image pickup apparatus having the same will be described below.
図１は本発明の実施例１のズームレンズの広角端（短焦点距離端）におけるレンズ断面図、図２、図３はそれぞれ実施例１のズームレンズの広角端、望遠端（長焦点距離端）における収差図である。 FIG. 1 is a lens cross-sectional view at the wide-angle end (short focal length end) of the zoom lens according to Embodiment 1 of the present invention. FIGS. 2 and 3 are a wide-angle end and a telephoto end (long focal length end) of the zoom lens according to Embodiment 1, respectively. FIG.
以下、収差図において（Ａ）、（Ｂ）は各々基準状態（物体距離無限遠）の縦収差図と横収差図である。又、収差図において（Ｃ）は無限遠物体を画角０．３度分に相当する像位置を変化させたときの（防振状態）の横収差図である。 Hereinafter, in the aberration diagrams, (A) and (B) are a longitudinal aberration diagram and a lateral aberration diagram in a reference state (infinite object distance), respectively. Also, in the aberration diagram, (C) is a lateral aberration diagram when the image position corresponding to an angle of view of 0.3 degrees is changed for an object at infinity (anti-vibration state).
図４は本発明の実施例２のズームレンズの広角端におけるレンズ断面図、図５、図６はそれぞれ実施例２のズームレンズの広角端、望遠端における収差図である。 FIG. 4 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 2 of the present invention, and FIGS. 5 and 6 are aberration diagrams at the wide-angle end and telephoto end of the zoom lens according to Embodiment 2, respectively.
図７は本発明の実施例３のズームレンズの広角端におけるレンズ断面図、図８、図９はそれぞれ実施例３のズームレンズの広角端、望遠端における収差図である。 FIG. 7 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 3 of the present invention, and FIGS. 8 and 9 are aberration diagrams at the wide-angle end and telephoto end of the zoom lens according to Embodiment 3, respectively.
図１０は本発明の実施例４のズームレンズの広角端におけるレンズ断面図、図１１、図１２はそれぞれ実施例４のズームレンズの広角端、望遠端における収差図である。 FIG. 10 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 4 of the present invention. FIGS. 11 and 12 are aberration diagrams at the wide-angle end and telephoto end of the zoom lens according to Embodiment 4, respectively.
図１３は本発明の実施例５のズームレンズの広角端におけるレンズ断面図、図１４、図１５はそれぞれ実施例５のズームレンズの広角端、望遠端における収差図である。 FIG. 13 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 5 of the present invention, and FIGS. 14 and 15 are aberration diagrams at the wide-angle end and telephoto end of the zoom lens according to Embodiment 5, respectively.
図１６は本発明の実施例６のズームレンズの広角端におけるレンズ断面図、図１７、図１８はそれぞれ実施例６のズームレンズの広角端、望遠端における収差図である。 FIG. 16 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Embodiment 6 of the present invention. FIGS. 17 and 18 are aberration diagrams at the wide-angle end and telephoto end of the zoom lens according to Embodiment 6, respectively.
図１９は本発明のズームレンズを備えるカメラ（撮像装置）の要部概略図である。各実施例のズームレンズはビデオカメラやデジタルカメラ、そして銀塩フィルムカメラ等の撮像装置に用いられる撮影レンズ系である。 FIG. 19 is a schematic diagram of a main part of a camera (imaging device) including the zoom lens according to the present invention. The zoom lens according to each embodiment is a photographing lens system used in an imaging apparatus such as a video camera, a digital camera, and a silver salt film camera.
レンズ断面図において、左方が被写体側（前方）で、右方が像側（後方）である。 In the lens cross-sectional view, the left side is the subject side (front), and the right side is the image side (rear).
レンズ断面図において、Ｌ１は正の屈折力（光学的パワー＝焦点距離の逆数）の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群である。ＬＣはズーミングに際して移動する１群以上のレンズ群から構成され、全ズーム範囲にて全体として正の屈折力の中間レンズユニットである。ＬＲは正の屈折力の後方レンズ群である。 In the lens cross-sectional view, L1 is a first lens group having a positive refractive power (optical power = reciprocal of focal length), and L2 is a second lens group having a negative refractive power. The LC is composed of one or more lens groups that move during zooming, and is an intermediate lens unit having a positive refractive power as a whole in the entire zoom range. LR is a rear lens unit having a positive refractive power.
尚、以下の説明においてレンズ群とは、単一又は複数のレンズより成る集合体であり、ズーミングに際して隣接するレンズ群とは独立に移動するものをいう。 In the following description, a lens group refers to an aggregate made up of a single lens or a plurality of lenses, and moves independently from adjacent lens groups during zooming.
各実施例のズームレンズは、広角端に対し、望遠端での第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広く、第２レンズ群Ｌ２と中間レンズユニットＬＣとの間隔が狭くなる。又、中間レンズユニットと後方レンズ群との間隔が狭くなるように各レンズ群が移動してズーミングを行っている。 In the zoom lens of each embodiment, the distance between the first lens group L1 and the second lens group L2 at the telephoto end is wider than the wide angle end, and the distance between the second lens group L2 and the intermediate lens unit LC is narrower. . Further, each lens group is moved and zoomed so that the distance between the intermediate lens unit and the rear lens group becomes narrow.
中間レンズユニットＬＣは光軸に対し垂直方向の成分を持つように移動して全系が形成する像を光軸と垂直方向に変位させる負の屈折力のレンズ部（防振レンズ部）を有している。 The intermediate lens unit LC has a lens unit (anti-vibration lens unit) having a negative refractive power that moves so as to have a component perpendicular to the optical axis and displaces the image formed by the entire system in the direction perpendicular to the optical axis. is doing.
各実施例においてフォーカスは第２レンズ群Ｌ２を光軸に沿って移動させて行っている。 In each embodiment, focusing is performed by moving the second lens unit L2 along the optical axis.
次に、図１、図１６の実施例１、６のレンズ構成について説明する。 Next, the lens configuration of Examples 1 and 6 in FIGS. 1 and 16 will be described.
図１、図１６のレンズ断面図において、Ｌ１は正の屈折力の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群、ＬＣは正の屈折力の中間レンズユニット、ＬＲは正の屈折力の後方レンズ群である。 1 and 16, L1 is a first lens unit having a positive refractive power, L2 is a second lens unit having a negative refractive power, LC is an intermediate lens unit having a positive refractive power, and LR is a positive lens unit. It is a rear lens group of refractive power.
中間レンズユニットＬＣは、物体側から像側へ順に正の屈折力のレンズ群（第ｒｐ１レンズ群）ｒｐ１、負の屈折力のレンズ群（第ｒｎ１１レンズ群）ｒｎ１１、負の屈折力のレンズ群（第ｒｎ１２レンズ群）ｒｎ１２を有している。 The intermediate lens unit LC includes, in order from the object side to the image side, a lens unit (rp1 lens group) rp1 having a positive refractive power, a lens group (rn11 lens group) rn11 having a negative refractive power, and a lens group having a negative refractive power. (The rn12 lens group) rn12 is provided.
レンズ群ｒｎ１１は、正レンズと負レンズとの接合レンズより成り、光軸に対し垂直方向の成分を持つように移動して全系が形成する像を光軸と垂直方向に変位させる防振レンズ部（ＧＩＳ）である。 The lens group rn11 is composed of a cemented lens of a positive lens and a negative lens, and moves so as to have a component perpendicular to the optical axis to displace an image formed by the entire system in a direction perpendicular to the optical axis. Part (GIS).
開口絞りＳＰはレンズ群ｒｐ１の物体側に位置している。 The aperture stop SP is located on the object side of the lens group rp1.
広角端に比べ望遠端において第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広くなる。又、第２レンズ群Ｌ２とレンズ群ｒｐ１との間隔が狭く、レンズ群ｒｐ１とレンズ群ｒｎ１１との間隔が広く、レンズ群ｒｎ１１とレンズ群ｒｎ１２との間隔が広くなる。又、レンズ群ｒｎ１２と後方レンズ群ＬＲとの間隔が狭くなるように各レンズ群が物体側へ移動してズーミングを行っている。 The distance between the first lens unit L1 and the second lens unit L2 is wider at the telephoto end than at the wide-angle end. In addition, the distance between the second lens group L2 and the lens group rp1 is narrow, the distance between the lens group rp1 and the lens group rn11 is wide, and the distance between the lens group rn11 and the lens group rn12 is wide. Further, each lens group moves toward the object side to perform zooming so that the distance between the lens group rn12 and the rear lens group LR is narrowed.
ズーミングに際してレンズ群ｒｐ１と後方レンズ群ＬＲは一体的に移動している。開口絞りＳＰはズーミングに際してレンズ群ｒｐ１と一体的に移動している。 During zooming, the lens group rp1 and the rear lens group LR are moved together. The aperture stop SP moves integrally with the lens group rp1 during zooming.
後方レンズ群ＬＲの焦点距離をｆｒｐとする。レンズ部Ｇｉｓの焦点距離をｆｉｓとする。望遠端におけるズームレンズの焦点距離をｆｔとする。このとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３ ‥‥‥（１）
−０．４＜ｆｒｎ１１／ｆｔ＜−０．１ ‥‥‥（４’）
なる条件を満足している。
The focal length of the rear lens group LR is set to frp. Let the focal length of the lens unit Gis be fis. Let ft be the focal length of the zoom lens at the telephoto end. At this time,
0.05 <frp / ft <0.3 (1)
−0.4 <frn11 / ft <−0.1 (4 ′)
Is satisfied.
又、広角端から望遠端へのズーミングにおける後方レンズ群ＬＲの光軸方向の移動量をＭｒｐとする。 The amount of movement of the rear lens unit LR in the optical axis direction during zooming from the wide-angle end to the telephoto end is Mrp.
但し、移動量Ｍｒｐの符号は物体側へ移動するときを負と、像側へ移動するときを正とする。 However, the sign of the movement amount Mrp is negative when moving to the object side and positive when moving to the image side.
後方レンズ群ＬＲ中の１つの正レンズの材料のアッベ数をνｄｐとする。このとき
７２＜νｄｐ＜９７ ‥‥‥（２）
−０．３＜Ｍｒｐ／ｆｔ＜−０．０５ ‥‥‥（３）
なる条件を満足している。
The Abbe number of the material of one positive lens in the rear lens group LR is νdp. At this time, 72 <νdp <97 (2)
−0.3 <Mrp / ft <−0.05 (3)
Is satisfied.
図４、図７、図１０の実施例２、３、４のレンズ構成について説明する。図４、図７、図１０のレンズ断面図において、Ｌ１は正の屈折力の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群、ＬＣは正の屈折力の中間レンズユニット、ＬＲは正の屈折力の後方のレンズ群である。 The lens configurations of Examples 2, 3, and 4 in FIGS. 4, 7, and 10 will be described. 4, 7, and 10, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, LC is an intermediate lens unit having a positive refractive power, LR Is a lens group behind the positive refractive power.
中間レンズユニットＬＣは物体側から像側へ順に正の屈折力のレンズ群ｒｐ１、負の屈折力のレンズ群ｒｎ１を有している。 The intermediate lens unit LC includes a lens unit rp1 having a positive refractive power and a lens group rn1 having a negative refractive power in order from the object side to the image side.
レンズ群ｒｎ１は、光軸に対し垂直方向の成分を持つように移動して全系が形成する像を光軸と垂直方向に変位させる負の屈折力のレンズ部（第Ｇｉｓレンズ群）Ｇｉｓを有している。レンズ部Ｇｉｓは正レンズと負レンズとの接合レンズより成っている。開口絞りＳＰはレンズ群ｒｐ１の物体側に位置している。 The lens group rn1 is a lens unit (first Gis lens group) Gis having a negative refractive power that moves so as to have a component perpendicular to the optical axis and displaces an image formed by the entire system in a direction perpendicular to the optical axis. Have. The lens unit Gis is composed of a cemented lens of a positive lens and a negative lens. The aperture stop SP is located on the object side of the lens group rp1.
広角端に比べ望遠端において、第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広くなる。又、第２レンズ群Ｌ２とレンズ群ｒｐ１との間隔が狭く、レンズ群ｒｐ１とレンズ群ｒｎ１との間隔が広く、レンズ群ｒｎ１と後方レンズ群ＬＲとの間隔が狭くなるように、各レンズ群が物体側へ移動してズーミングを行っている。 The distance between the first lens unit L1 and the second lens unit L2 is wider at the telephoto end than at the wide-angle end. In addition, each lens group is configured such that the distance between the second lens group L2 and the lens group rp1 is narrow, the distance between the lens group rp1 and the lens group rn1 is wide, and the distance between the lens group rn1 and the rear lens group LR is narrow. Moves to the object side and zooms.
ズーミングに際してレンズ群ｒｐ１と後方レンズ群ＬＲは一体的に移動している。 During zooming, the lens group rp1 and the rear lens group LR are moved together.
開口絞りＳＰは、ズーミングに際してレンズ群ｒｐ１と一体的に移動している。 The aperture stop SP moves integrally with the lens group rp1 during zooming.
後方レンズ群ＬＲの焦点距離をｆｒｐとする。レンズ部Ｇｉｓの焦点距離をｆｉｓとする。望遠端におけるズームレンズの焦点距離をｆｔとする。このとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３ ‥‥‥（１）
−０．４＜ｆｉｓ／ｆｔ＜−０．１ ‥‥‥（４）
なる条件を満足している。
The focal length of the rear lens group LR is set to frp. Let the focal length of the lens unit Gis be fis. Let ft be the focal length of the zoom lens at the telephoto end. At this time,
0.05 <frp / ft <0.3 (1)
−0.4 <fis / ft <−0.1 (4)
Is satisfied.
又、レンズ群ｒｎ１の焦点距離をｆｒｎ１とするとき
１．１＜ｆｉｓ／ｆｒｎ１＜３．０ ‥‥‥（５）
なる条件を満足している。
When the focal length of the lens unit rn1 is frn1, 1.1 <fis / frn1 <3.0 (5)
Is satisfied.
又、広角端から望遠端へのズーミングにおける後方レンズ群ＬＲの光軸方向の移動量をＭｒｐとする。 The amount of movement of the rear lens unit LR in the optical axis direction during zooming from the wide-angle end to the telephoto end is Mrp.
後方レンズ群ＬＲ中の１つの正レンズの材料のアッベ数をνｄｐとする。 The Abbe number of the material of one positive lens in the rear lens group LR is νdp.
７２＜νｄｐ＜９７ ‥‥‥（２）
−０．３＜Ｍｒｐ／ｆｔ＜−０．０５ ‥‥‥（３）
なる条件のうち１以上を満足している。
72 <νdp <97 (2)
−0.3 <Mrp / ft <−0.05 (3)
One or more of the following conditions are satisfied.
図１３の実施例５のレンズ構成について説明する。 The lens configuration of Example 5 in FIG. 13 will be described.
図１３のレンズ断面図において、Ｌ１は正の屈折力の第１レンズ群、Ｌ２は負の屈折力の第２レンズ群、ＬＣは正の屈折力の中間レンズユニット、ＬＲは正の屈折力の後方レンズ群である。 In the lens cross-sectional view of FIG. 13, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, LC is an intermediate lens unit having a positive refractive power, and LR is a positive refractive power. It is a rear lens group.
中間レンズユニットＬＲは光軸に対し垂直方向の成分を持つように移動して全系が形成する像を変位させる負の屈折力のレンズ部Ｇｉｓを有している。 The intermediate lens unit LR includes a lens unit Gis having a negative refractive power that moves so as to have a component perpendicular to the optical axis and displaces an image formed by the entire system.
レンズ部Ｇｉｓは正レンズと負レンズの接合レンズより成っている。開口絞りＳＰは中間レンズユニットＬＣの物体側に位置している。 The lens unit Gis is composed of a cemented lens of a positive lens and a negative lens. The aperture stop SP is located on the object side of the intermediate lens unit LC.
広角端に比べ望遠端において第１レンズ群Ｌ１と第２レンズ群Ｌ２との間隔が広くなる。又、第２レンズ群Ｌ２と中間レンズユニットＬＣとの間隔が狭く、中間レンズユニットＬＣと後方レンズ群ＬＲとの間隔が狭くなるように各レンズ群と中間レンズユニットＬＣが物体側へ移動してズーミングを行っている。 The distance between the first lens unit L1 and the second lens unit L2 is wider at the telephoto end than at the wide-angle end. Each lens group and the intermediate lens unit LC move toward the object side so that the distance between the second lens group L2 and the intermediate lens unit LC is narrow, and the distance between the intermediate lens unit LC and the rear lens group LR is narrow. I'm doing zooming.
開口絞りＳＰはズーミングに際して中間レンズユニットＬＣと一体的に移動している。 The aperture stop SP moves integrally with the intermediate lens unit LC during zooming.
広角端から望遠端へのズーミングにおける後方レンズ群ＬＲの光軸方向の移動量をＭｒｐとする。 An amount of movement of the rear lens unit LR in the optical axis direction during zooming from the wide-angle end to the telephoto end is Mrp.
後方レンズ群ＬＲの焦点距離をｆｒｐとする。後方レンズ群ＬＲ中の１つの正レンズの材料のアッベ数をνｄｐとする。望遠端におけるズームレンズの焦点距離をｆｔとする。このとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３ ‥‥‥（１）
７２＜νｄｐ＜９７ ‥‥‥（２）
−０．３＜Ｍｒｐ／ｆｔ＜−０．０５ ‥‥‥（３）
なる条件のうち１以上を満足している。
The focal length of the rear lens group LR is set to frp. The Abbe number of the material of one positive lens in the rear lens group LR is νdp. Let ft be the focal length of the zoom lens at the telephoto end. At this time,
0.05 <frp / ft <0.3 (1)
72 <νdp <97 (2)
−0.3 <Mrp / ft <−0.05 (3)
One or more of the following conditions are satisfied.
レンズ部Ｇｉｓの焦点距離をｆｉｓとする。このとき、
−０．４＜ｆｉｓ／ｆｔ＜−０．１ ‥‥‥（４）
なる条件を満足している。
Let the focal length of the lens unit Gis be fis. At this time,
−0.4 <fis / ft <−0.1 (4)
Is satisfied.
又、各実施例においては、次の条件のうち１以上を満足している。 In each embodiment, one or more of the following conditions are satisfied.
後方レンズ群ＬＲは、１以上の正レンズと１枚の負レンズを有し、１以上の正レンズのうち材料の分散が最も低い正レンズの焦点距離をｆｐ、負レンズの材料のアッベ数をνｄｎとする。 The rear lens group LR includes one or more positive lenses and one negative lens. Among the one or more positive lenses, the focal length of the positive lens having the lowest material dispersion is fp, and the Abbe number of the material of the negative lens is Let vdn.
第１レンズ群Ｌ１の焦点距離をｆ１、第２レンズ群Ｌ２の焦点距離をｆ２とする。 The focal length of the first lens unit L1 is f1, and the focal length of the second lens unit L2 is f2.
このとき
０．０５＜ｆｐ／ｆｒｐ＜２．０ ‥‥‥（６）
３４＜νｄｎ＜６０ ‥‥‥（７）
−０．１５＜ｆ２／ｆｔ＜−０．０４ ‥‥‥（８）
０．３＜ｆ１／ｆｔ＜０．８ ‥‥‥（９）
なる条件のうち１以上を満足している。
At this time, 0.05 <fp / frp <2.0 (6)
34 <νdn <60 (7)
−0.15 <f2 / ft <−0.04 (8)
0.3 <f1 / ft <0.8 (9)
One or more of the following conditions are satisfied.
次に前述した各条件式の技術的な意味について説明する。 Next, the technical meaning of each conditional expression described above will be described.
各実施例では、最も像側に正の屈折力の後方レンズ群ＬＲの屈折力を強めて、広角端においてレトロフォーカス型を形成し、十分な長さのバックフォーカスを確保している。しかしながら、最も像側の後方レンズ群ＬＲの屈折力を強めると広角端における倍率色収差が悪化する。そこで各実施例では、条件式（１）、（２）を満足することにより、所定の長さのバックフォーカスを確保しつつ、後方レンズ群ＬＲ中の正レンズの材質を適切に設定することで良好な光学性能を実現している。 In each embodiment, the refracting power of the rear lens unit LR having the positive refracting power is strengthened on the most image side, a retrofocus type is formed at the wide angle end, and a sufficiently long back focus is secured. However, when the refractive power of the rear lens unit LR closest to the image side is increased, the lateral chromatic aberration at the wide angle end is deteriorated. Therefore, in each embodiment, by satisfying the conditional expressions (1) and (2), it is possible to appropriately set the material of the positive lens in the rear lens group LR while ensuring a predetermined length of back focus. Good optical performance is achieved.
条件式（１）は後方レンズ群ＬＲの焦点距離と望遠端における全系の焦点距離の比に関し、主に十分な長さのバックフォーカスを確保しつつ良好な光学性能を維持するためのものである。 Conditional expression (1) relates to the ratio between the focal length of the rear lens group LR and the focal length of the entire system at the telephoto end, and is mainly for maintaining good optical performance while ensuring a sufficiently long back focus. is there.
条件式（１）の下限値を超えると後方レンズ群ＬＲの屈折力が強くなり過ぎて歪曲収差と像面湾曲が増大し、これらを補正するのが困難となるため良くない。 If the lower limit value of conditional expression (1) is exceeded, the refractive power of the rear lens group LR becomes too strong and distortion and field curvature increase, making it difficult to correct them, which is not good.
また、上限値を越えて後方レンズ群ＬＲの屈折力が弱くなり過ぎると、特に広角端においてバックフォーカスを確保するのが困難となり、また、ズーミングにおける各レンズ群の移動量が増大しレンズ系が大型化するので良くない。 If the refractive power of the rear lens unit LR becomes too weak beyond the upper limit, it becomes difficult to secure the back focus especially at the wide-angle end, and the amount of movement of each lens unit during zooming increases and the lens system becomes Because it enlarges, it is not good.
条件式（２）は後方レンズ群ＬＲの中で少なくとも１つの正レンズの材質のアッベ数を規定したものであり、特に広角端における倍率色収差を良好にするためのものである。 Conditional expression (2) defines the Abbe number of the material of at least one positive lens in the rear lens group LR, and is particularly for improving the lateral chromatic aberration at the wide angle end.
条件式（２）の下限値を超えると特に広角端における倍率色収差が正側に増大し、これを補正するのが困難となるので良くない。 Exceeding the lower limit of conditional expression (2) is not good because the lateral chromatic aberration at the wide-angle end increases to the positive side, making it difficult to correct this.
また、上限値を越えると特に広角端における倍率色収差が負側に増大し、これを補正するのが困難となるので良くない。 Further, if the upper limit is exceeded, the lateral chromatic aberration particularly at the wide-angle end increases to the negative side, which is not good because it becomes difficult to correct this.
条件式（３）は広角端から望遠端へのズーミングの際の後方レンズ群ＬＲの移動量と望遠端における全系の焦点距離の比に関し、レンズ系全体の小型化と高ズーム比化のバランスを図るものである。 Conditional expression (3) relates to the ratio of the amount of movement of the rear lens unit LR during zooming from the wide-angle end to the telephoto end and the focal length of the entire system at the telephoto end, and the balance between miniaturization of the entire lens system and high zoom ratio. Is intended.
条件式（３）の下限値を超えると後方レンズ群ＬＲのズーミングにおける移動量が増大するため特に望遠端における光学全長が増大するため良くない。また、上限値を越えると移動量が減少し、後方レンズ群ＬＲの変倍分担が減り高ズーム比化が困難となるので良くない。 If the lower limit value of conditional expression (3) is exceeded, the amount of movement of the rear lens unit LR during zooming increases, so the optical total length at the telephoto end increases, which is not good. Also, if the upper limit is exceeded, the amount of movement decreases, and the variable magnification share of the rear lens group LR decreases, making it difficult to achieve a high zoom ratio.
条件式（４）は、実施例２〜５において防振用のレンズ部Ｇｉｓの焦点距離と望遠端における全系の焦点距離の比に関し、防振用のレンズ部Ｇｉｓの防振敏感度を適切に設定しつつ良好な光学性能を得るためのものである。 Conditional expression (4) appropriately sets the image stabilization sensitivity of the image stabilizing lens unit Gis in relation to the ratio between the focal length of the image stabilizing lens unit Gis and the focal length of the entire system at the telephoto end in Examples 2 to 5. It is for obtaining good optical performance while setting to.
条件式（４）の下限値を超えるとレンズ部Ｇｉｓの屈折力が弱くなり過ぎて、防振敏感度が低くなり、防振時のレンズ部Ｇｉｓの変位量が増大するので良くない。また、上限値を越えるとレンズ部Ｇｉｓの屈折力が強くなり過ぎて、特に防振時に発生する偏心コマ収差の補正が困難となる。また、防振敏感度が高くなり過ぎて防振時のレンズ部Ｇｉｓの制御が困難となるので良くない。 If the lower limit value of the conditional expression (4) is exceeded, the refractive power of the lens unit Gis becomes too weak, and the anti-vibration sensitivity becomes low, and the amount of displacement of the lens unit Gis at the time of anti-vibration increases. If the upper limit is exceeded, the refractive power of the lens portion Gis becomes too strong, and it becomes difficult to correct decentration coma that occurs particularly during image stabilization. In addition, the sensitivity of image stabilization becomes too high, and it becomes difficult to control the lens unit Gis during image stabilization.
尚、実施例１、６では条件式（４）は条件式（４’）に相当し、レンズ部Ｇｉｓはレンズ群ｒｎ１１に相当する。条件式（４’）の技術的意味は条件式（４）と同じである。 In Examples 1 and 6, the conditional expression (4) corresponds to the conditional expression (4 ′), and the lens unit Gis corresponds to the lens group rn11. The technical meaning of conditional expression (4 ') is the same as that of conditional expression (4).
条件式（５）は実施例２、３、４に関するものである。 Conditional expression (5) relates to Examples 2, 3, and 4.
条件式（５）は防振用のレンズ部Ｇｉｓの焦点距離とレンズ群ｒｎ１の焦点距離の比に関し、特に防振敏感度を適切に設定しつつ良好な光学性能を得るためのものである。 Conditional expression (5) relates to the ratio of the focal length of the anti-vibration lens unit Gis and the focal length of the lens unit rn1, in particular, to obtain good optical performance while appropriately setting the anti-vibration sensitivity.
条件式（５）の上限値を越えるとレンズ群ｒｎ１に対してレンズ部Ｇｉｓの屈折力が弱くなり過ぎて防振敏感度が低くなり、防振時のレンズ部Ｇｉｓの変位量が増大するので良くない。 If the upper limit of conditional expression (5) is exceeded, the refractive power of the lens unit Gis becomes too weak with respect to the lens group rn1 and the vibration-proof sensitivity decreases, and the amount of displacement of the lens unit Gis during vibration-proof increases. Not good.
また、下限値を越えるとレンズ群ｒｎ１に対してレンズ部Ｇｉｓの屈折力が強くなり過ぎて、特に防振時に発生する偏心コマ収差の補正が困難となる。また、防振敏感度が高くなり過ぎて防振時のレンズ部Ｇｉｓの制御が困難となるので良くない。 If the lower limit is exceeded, the refractive power of the lens unit Gis becomes too strong with respect to the lens group rn1, and it becomes difficult to correct decentration coma generated particularly during image stabilization. In addition, the sensitivity of image stabilization becomes too high, and it becomes difficult to control the lens unit Gis during image stabilization.
条件式（６）は後方レンズ群ＬＲの焦点距離と後方レンズ群ＬＲ中、最も低分散の材質からなる正レンズＧＰの焦点距離の比に関し、主に倍率色収差と像面湾曲をバランス良く補正するためのものである。 Conditional expression (6) relates to the ratio of the focal length of the rear lens group LR and the focal length of the positive lens GP made of the lowest dispersion material in the rear lens group LR, and mainly corrects the lateral chromatic aberration and the curvature of field in a balanced manner. Is for.
条件式（６）の下限値を超えると正レンズＧＰの屈折力が強くなり過ぎて、特に広角端における像面湾曲が増大し補正困難となるので良くない。また、上限値を越えると正レンズＧＰの屈折力が弱くなり過ぎて、低分散の材質を用いて倍率色収差を補正する効果が少なくなり、特に広角端において倍率色収差が負側に増大するので良くない。 If the lower limit value of conditional expression (6) is exceeded, the refractive power of the positive lens GP becomes too strong, and particularly the field curvature at the wide angle end increases, making correction difficult, which is not good. Further, if the upper limit is exceeded, the refractive power of the positive lens GP becomes too weak, and the effect of correcting the lateral chromatic aberration using a low dispersion material is reduced. Especially, the lateral chromatic aberration is increased to the negative side at the wide angle end. Absent.
条件式（７）は後方レンズ群ＬＲ中の最も像面側に配置された負レンズＧｎの材質のアッベ数を規定したものであり、主に広角端における倍率色収差を補正するためのものである。 Conditional expression (7) defines the Abbe number of the material of the negative lens Gn arranged closest to the image plane in the rear lens group LR, and is mainly for correcting lateral chromatic aberration at the wide-angle end. .
条件式（７）の下限値を越えると、広角端における倍率色収差が正側に増大し、これを補正するのが困難となるので良くない。また、下限値を越えると、広角端における倍率色収差が負側に増大し、これを補正するのが困難となるので良くない。 If the lower limit value of conditional expression (7) is exceeded, the lateral chromatic aberration at the wide-angle end increases to the positive side, which is not good because it becomes difficult to correct this. On the other hand, if the lower limit is exceeded, the lateral chromatic aberration at the wide-angle end increases to the negative side, which is not good because it becomes difficult to correct this.
条件式（８）は、第２レンズ群Ｌ２の焦点距離と望遠端における全系の焦点距離の比に関し、良好な光学性能を得つつレンズ系全体の小型化を図るためのものである。 Conditional expression (8) relates to the ratio of the focal length of the second lens unit L2 to the focal length of the entire system at the telephoto end, in order to reduce the size of the entire lens system while obtaining good optical performance.
条件式（８）の下限値を超えて第２レンズ群Ｌ２の屈折力が弱くなり過ぎると、広角端においてレンズ系全体のレトロフォーカス型が弱くなり、長いバックフォーカスを確保するのが困難となるので良くない。 If the lower limit of conditional expression (8) is exceeded and the refractive power of the second lens unit L2 becomes too weak, the retrofocus type of the entire lens system becomes weak at the wide-angle end, making it difficult to ensure a long back focus. So not good.
また、第２レンズ群Ｌ２は変倍分担が大きいので屈折力が弱くなると高ズーム比化が困難となるので良くない。また、上限値を越えて、第２レンズ群Ｌ２の屈折力が強くなり過ぎると特に広角端における像面湾曲と歪曲収差をバランス良く補正することが困難となるので良くない。 In addition, since the second lens unit L2 has a large variable magnification share, if the refractive power becomes weak, it is difficult to achieve a high zoom ratio. If the refractive power of the second lens unit L2 exceeds the upper limit and becomes too strong, it is difficult to correct the curvature of field and distortion at a wide angle end in a well-balanced manner.
又、第２レンズ群Ｌ２の焦点距離が条件式（８）を満足する程度に屈折力が強くなると、フォーカシングにおける第２レンズ群Ｌ２の繰出量が少なくなるので好ましい。 Further, it is preferable that the refractive power is increased to such an extent that the focal length of the second lens unit L2 satisfies the conditional expression (8), since the amount of extension of the second lens unit L2 during focusing is reduced.
条件式（９）は第１レンズ群Ｌ１の焦点距離と望遠端における全系の焦点距離の比に関し、レンズ系全体の小型化と良好な光学性能を得るためのものである。 Conditional expression (9) relates to the ratio of the focal length of the first lens unit L1 to the focal length of the entire system at the telephoto end, in order to obtain a compact lens system and good optical performance.
条件式（９）の下限を超えて第１レンズ群Ｌ１の屈折力が強くなり過ぎると、特に望遠端における球面収差が補正不足となるので良くない。また、上限値を越えて第１レンズ群Ｌ１の屈折力が弱くなり過ぎると変倍における第１レンズ群Ｌ１の移動量が増大し、レンズ系が大型化するので良くない。 If the lower limit of conditional expression (9) is exceeded and the refractive power of the first lens unit L1 becomes too strong, the spherical aberration, particularly at the telephoto end, becomes insufficiently corrected, which is not good. If the refractive power of the first lens unit L1 becomes too weak beyond the upper limit, the amount of movement of the first lens unit L1 during zooming increases, and the lens system becomes large, which is not good.
尚、各実施例において更に好ましくは、前述した条件式（１）〜（９）、（４’）の数値範囲を次の如く設定するのが良い。 In each embodiment, more preferably, the numerical ranges of the conditional expressions (1) to (9) and (4 ') described above are set as follows.
０．１＜ｆｒｐ／ｆｔ＜０．２５ ‥‥‥（１ａ）
８０＜νｄｐ＜９７ ‥‥‥（２ａ）
−０．２５＜Ｍｒｐ／ｆｔ＜−０．１ ‥‥‥（３ａ）
−０．３５＜ｆｉｓ／ｆｔ＜−０．１３ ‥‥‥（４ａ）
−０．３５＜ｆｒｎ１１／ｆｔ＜−０．１３‥‥‥（４’ａ）
１．２＜ｆｉｓ／ｆｒｎ１＜２．５ ‥‥‥（５ａ）
０．６＜ｆｐ／ｆｒｐ＜１．５ ‥‥‥（６ａ）
３６＜νｄｎ＜５５ ‥‥‥（７ａ）
−０．１１＜ｆ２／ｆｔ＜−０．０５ ‥‥‥（８ａ）
０．３５＜ｆ１／ｆｔ＜０．７ ‥‥‥（９ａ）
次に、本発明のズームレンズを用いた一眼レフカメラシステムの実施形態を、図１９を用いて説明する。図１９において、１０は一眼レフカメラ本体、１１は本発明によるズームレンズを搭載した交換レンズである。
0.1 <frp / ft <0.25 (1a)
80 <νdp <97 (2a)
−0.25 <Mrp / ft <−0.1 (3a)
−0.35 <fis / ft <−0.13 (4a)
−0.35 <frn11 / ft <−0.13 (4′a)
1.2 <fis / frn1 <2.5 (5a)
0.6 <fp / frp <1.5 (6a)
36 <νdn <55 (7a)
−0.11 <f2 / ft <−0.05 (8a)
0.35 <f1 / ft <0.7 (9a)
Next, an embodiment of a single-lens reflex camera system using the zoom lens of the present invention will be described with reference to FIG. In FIG. 19, 10 is a single-lens reflex camera body, and 11 is an interchangeable lens equipped with a zoom lens according to the present invention.
１２は交換レンズ１１を通して得られる被写体像を記録するフィルムや固体撮像素子などの記録手段である。 Reference numeral 12 denotes a recording unit such as a film or a solid-state imaging device for recording a subject image obtained through the interchangeable lens 11.
１３は交換レンズ１１からの被写体像を観察するファインダー光学系、１４は交換レンズ１１からの被写体像を記録手段１２とファインダー光学系１３に切り替えて伝送するための回動するクイックリターンミラーである。 Reference numeral 13 denotes a finder optical system for observing a subject image from the interchangeable lens 11, and reference numeral 14 denotes a rotating quick return mirror for switching and transmitting the subject image from the interchangeable lens 11 to the recording means 12 and the finder optical system 13.
ファインダー像で被写体像を観察する場合は、クイックリターンミラー１４を介してピント板１５に結像した被写体像をペンタプリズム１６で正立像としたのち、接眼光学系１７で拡大して観察する。 When observing a subject image with a finder image, the subject image formed on the focus plate 15 via the quick return mirror 14 is converted into an erect image by the pentaprism 16 and then enlarged and observed by the eyepiece optical system 17.
撮影時にはクイックリターンミラー１４が矢印方向に回動して被写体像は記録手段１２に結像して記録される。１８はサブミラー、１９は焦点検出装置である。 At the time of shooting, the quick return mirror 14 rotates in the direction of the arrow, and the subject image is formed and recorded on the recording means 12. Reference numeral 18 denotes a submirror, and 19 denotes a focus detection device.
このように本発明のズームレンズを一眼レフカメラ交換レンズ等の光学機器に適用することにより、高い光学性能を有した光学機器が実現できる。 Thus, by applying the zoom lens of the present invention to an optical device such as a single lens reflex camera interchangeable lens, an optical device having high optical performance can be realized.
尚、本発明はクイックリターンミラーのない一眼レフカメラにも同様に適用することができる。 It should be noted that the present invention can be similarly applied to a single-lens reflex camera without a quick return mirror.
以下に、実施例１から６に各々対応する数値実施例１から６を示す。各数値実施例において、ｉは物体側からの面の順番を示し、Ｒｉは各面の曲率半径、Ｄｉは第ｉ面と第ｉ面＋１面との間の部材肉厚又は空気間隔、Ｎｉ、νｉはそれぞれｄ線に対する屈折率、アッベ数を示す。非球面形状は光軸からの高さＨの位置での光軸方向の変位を面頂点を基準にしてＸとするとき、 In the following, numerical examples 1 to 6 corresponding to the first to sixth examples will be described. In each numerical example, i indicates the order of the surfaces from the object side, Ri is the radius of curvature of each surface, Di is the member thickness or air space between the i-th surface and the i-th surface + 1 surface, Ni, νi represents the refractive index and Abbe number for the d-line, respectively. When the aspherical shape is X with the displacement in the optical axis direction at the position of the height H from the optical axis as the reference to the surface vertex,
で表わされる。 It is represented by
但し、Ｒは近軸曲率半径、Ａ、Ｂ、Ｃ、Ｄ、Ｅ、Ｆは非球面係数である。 Here, R is a paraxial radius of curvature, and A, B, C, D, E, and F are aspherical coefficients.
又、［ｅ−Ｘ］は［×１０−Ｘ］を意味している。ｆは焦点距離、ＦｎｏはＦナンバー、Ｈは、近軸像面上での像高を表す。又前述の各条件式と数値実施例における諸数値との関係を表−１に示す。 [E-X] means [× 10-X]. f represents the focal length, Fno represents the F number, and H represents the image height on the paraxial image plane. Table 1 shows the relationship between the above-described conditional expressions and numerical values in the numerical examples.
数値実施例１
ｆ＝ 18.60〜 192.00 Ｆｎｏ＝ 3.52 〜 5.85 ２ω＝72.6 〜 8.1
R 1 = 89.769 D 1 = 1.70 N 1 = 1.846660 ν 1 = 23.9
R 2 = 57.586 D 2 = 8.55 N 2 = 1.496999 ν 2 = 81.5
R 3 = -445.084 D 3 = 0.15
R 4 = 49.297 D 4 = 4.54 N 3 = 1.603112 ν 3 = 60.6
R 5 = 115.481 D 5 = 可変
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 43.236 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 11.637 D 8 = 6.19
R 9 = -41.956 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 40.531 D10 = 0.13
R11 = 19.617 D11 = 4.45 N 7 = 1.846660 ν 7 = 23.9
R12 = -32.642 D12 = 0.40
R13 = -25.574 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 44.778 D14 = 可変
R15 = 絞り D15 = 0.59
R16 = 24.884 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.220 D17 = 4.25 N10 = 1.487490 ν10 = 70.2
R18 = -47.844 D18 = 0.12
* R19 = 30.455 D19 = 3.05 N11 = 1.487490 ν11 = 70.2
R20 = -59.065 D20 = 可変
R21 = -53.973 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -19.278 D22 = 0.85 N13 = 1.717004 ν13 = 47.9
R23 = 45.709 D23 = 可変
R24 = -15.139 D24 = 0.90 N14 = 1.772499 ν14 = 49.6
R25 = -21.730 D25 = 可変
R26 = 49.761 D26 = 5.03 N15 = 1.583126 ν15 = 59.4
* R27 = -19.986 D27 = 0.20
R28 = 75.995 D28 = 5.70 N16 = 1.496999 ν16 = 81.5
R29 = -16.551 D29 = 1.25 N17 = 1.834000 ν17 = 37.2
R30 = -228.192
＼焦点距離 18.60 58.65 192.00
可変間隔＼
D 5 1.72 28.76 50.63
D14 21.44 11.06 3.51
D20 4.67 9.28 11.77
D23 2.81 2.87 3.29
D25 8.02 3.34 0.43
非球面係数
6面 : Ａ=0.00000e+00 Ｂ=-6.88515e-06 Ｃ=1.12679e-08
Ｄ=-4.74649e-10 E=3.26089e-12 F=-7.10506e-15
19面 : Ａ=0.00000e+00 Ｂ=-6.56788e-07 Ｃ=1.20029e-08
Ｄ=-1.10145e-10 E=0.00000e+00 F=0.00000e+00
27面 : ｋ=-6.36581e-01 Ａ=０ Ｂ=3.10394e-06 Ｃ=5.69153e-09
Ｄ=-1.17025e-10 E=1.65775e-13 F=-1.97327e-16
数値実施例２
ｆ＝ 18.60〜 192.00 Ｆｎｏ＝ 3.62 〜 6.23 ２ω＝72.6 〜 8.1
R 1 = 89.461 D 1 = 1.55 N 1 = 1.846660 ν 1 = 23.9
R 2 = 58.885 D 2 = 8.50 N 2 = 1.496999 ν 2 = 81.5
R 3 = -421.441 D 3 = 0.15
R 4 = 50.256 D 4 = 4.32 N 3 = 1.603112 ν 3 = 60.6
R 5 = 104.305 D 5 = 可変
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 47.233 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 11.874 D 8 = 6.53
R 9 = -42.131 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 49.410 D10 = 0.15
R11 = 20.219 D11 = 4.70 N 7 = 1.846660 ν 7 = 23.9
R12 = -35.707 D12 = 0.23
R13 = -31.226 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 38.685 D14 = 可変
R15 = 絞り D15 = 0.58
R16 = 24.913 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.228 D17 = 3.50 N10 = 1.487490 ν10 = 70.2
R18 = -35.784 D18 = 0.15
R19 = 26.590 D19 = 2.30 N11 = 1.487490 ν11 = 70.2
R20 = -72.424 D20 = 可変
R21 = -43.112 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -17.123 D22 = 0.85 N13 = 1.673506 ν13 = 41.5
R23 = 45.709 D23 = 2.33
R24 = -15.359 D24 = 0.90 N14 = 1.712995 ν14 = 53.9
R25 = -32.502 D25 = 可変
R26 = 102.912 D26 = 4.22 N15 = 1.583126 ν15 = 59.4
* R27 = -17.104 D27 = 0.19
R28 = 79.119 D28 = 5.70 N16 = 1.496999 ν16 = 81.5
R29 = -14.328 D29 = 1.25 N17 = 1.834807 ν17 = 42.7
R30 = -117.678 D30 = 1.00
R31 = -39.286 D31 = 2.00 N18 = 1.487490 ν18 = 70.2
R32 = -31.432
＼焦点距離 18.60 59.39 192.00
可変間隔＼
D 5 1.79 30.12 53.17
D14 24.73 12.13 3.48
D20 5.07 8.88 11.05
D25 6.52 2.70 0.53
非球面係数
6面 : Ａ=0.00000e+00 Ｂ=-1.01380e-05 Ｃ=8.38266e-09
Ｄ=-5.59245e-10 E=3.41480e-12 F=-6.96063e-15
27面 : ｋ=-2.41555e-01 Ａ=０ Ｂ=7.47928e-06 Ｃ=1.13008e-09
Ｄ=-2.03460e-10 E=6.58968e-13 F=2.31317e-15
数値実施例３
ｆ＝ 18.60〜 190.00 Ｆｎｏ＝ 3.62 〜 6.20 ２ω＝72.6 〜 8.2
R 1 = 89.543 D 1 = 1.55 N 1 = 1.846660 ν 1 = 23.9
R 2 = 58.704 D 2 = 8.50 N 2 = 1.496999 ν 2 = 81.5
R 3 = -414.639 D 3 = 0.15
R 4 = 49.683 D 4 = 5.08 N 3 = 1.603112 ν 3 = 60.6
R 5 = 106.385 D 5 = 可変
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 46.711 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 11.810 D 8 = 6.63
R 9 = -40.202 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 48.130 D10 = 0.15
R11 = 20.032 D11 = 5.09 N 7 = 1.846660 ν 7 = 23.9
R12 = -34.638 D12 = 0.35
R13 = -29.698 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 38.065 D14 = 可変
R15 = 絞り D15 = 0.92
R16 = 25.368 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.199 D17 = 3.50 N10 = 1.487490 ν10 = 70.2
R18 = -35.355 D18 = 0.15
R19 = 26.513 D19 = 2.30 N11 = 1.487490 ν11 = 70.2
R20 = -77.107 D20 = 可変
R21 = -44.181 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -16.797 D22 = 0.85 N13 = 1.696542 ν13 = 41.9
R23 = 45.709 D23 = 2.42
R24 = -15.548 D24 = 0.90 N14 = 1.712995 ν14 = 53.9
R25 = -26.487 D25 = 可変
R26 = 98.159 D26 = 4.36 N15 = 1.583126 ν15 = 59.4
* R27 = -18.399 D27 = 0.19
R28 = 126.691 D28 = 5.70 N16 = 1.438750 ν16 = 95.0
R29 = -14.791 D29 = 1.25 N17 = 1.804398 ν17 = 39.6
R30 = -52.123
＼焦点距離 18.60 57.73 190.00
可変間隔＼
D 5 1.14 28.21 51.31
D14 21.96 10.75 2.69
D20 5.03 9.45 12.03
D25 7.60 3.17 0.59
非球面係数
6面 : Ａ=0.00000e+00 Ｂ=-1.00987e-05 Ｃ=4.69166e-09
Ｄ=-3.05264e-10 E=1.48443e-12 F=-2.56565e-15
27面 : ｋ=-3.78417e-01 Ａ=０ Ｂ=9.97785e-07 Ｃ=-3.51999e-09
Ｄ=-1.26563e-10 E=7.57633e-14 F=-5.96396e-16
数値実施例４
ｆ＝ 18.60〜 192.00 Ｆｎｏ＝ 3.62 〜 6.23 ２ω＝72.6 〜 8.1
R 1 = 89.461 D 1 = 1.55 N 1 = 1.846660 ν 1 = 23.9
R 2 = 58.885 D 2 = 8.50 N 2 = 1.496999 ν 2 = 81.5
R 3 = -421.441 D 3 = 0.15
R 4 = 50.256 D 4 = 4.32 N 3 = 1.603112 ν 3 = 60.6
R 5 = 104.305 D 5 = 可変
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 47.233 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 11.874 D 8 = 6.53
R 9 = -42.131 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 49.410 D10 = 0.15
R11 = 20.219 D11 = 4.70 N 7 = 1.846660 ν 7 = 23.9
R12 = -35.707 D12 = 0.23
R13 = -31.226 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 38.685 D14 = 可変
R15 = 絞り D15 = 0.58
R16 = 24.913 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.228 D17 = 3.50 N10 = 1.487490 ν10 = 70.2
R18 = -35.784 D18 = 0.15
R19 = 26.590 D19 = 2.30 N11 = 1.487490 ν11 = 70.2
R20 = -72.424 D20 = 可変
R21 = -43.112 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -17.123 D22 = 0.85 N13 = 1.673506 ν13 = 41.5
R23 = 45.709 D23 = 2.33
R24 = -15.359 D24 = 0.90 N14 = 1.712995 ν14 = 53.9
R25 = -32.502 D25 = 可変
R26 = 102.912 D26 = 4.22 N15 = 1.583126 ν15 = 59.4
* R27 = -17.104 D27 = 0.19
R28 = 79.119 D28 = 5.70 N16 = 1.496999 ν16 = 81.5
R29 = -14.328 D29 = 1.25 N17 = 1.834807 ν17 = 42.7
R30 = -117.678 D30 = 1.00
R31 = -39.286 D31 = 2.00 N18 = 1.487490 ν18 = 70.2
R32 = -31.432
＼焦点距離 18.60 59.39 192.00
可変間隔＼
D 5 1.79 30.12 53.17
D14 24.73 12.13 3.48
D20 5.07 8.88 11.05
D25 6.52 2.70 0.53
非球面係数
6面 : Ａ=0.00000e+00 Ｂ=-1.01380e-05 Ｃ=8.38266e-09
Ｄ=-5.59245e-10 E=3.41480e-12 F=-6.96063e-15
27面 : ｋ=-2.41555e-01 Ａ=０ Ｂ=7.47928e-06 Ｃ=1.13008e-09
Ｄ=-2.03460e-10 E=6.58968e-13 F=2.31317e-15
数値実施例５
ｆ＝ 18.60〜 150.05 Ｆｎｏ＝ 3.62 〜 5.70 ２ω＝72.6 〜 10.4
R 1 = 86.804 D 1 = 1.55 N 1 = 1.846660 ν 1 = 23.9
R 2 = 60.219 D 2 = 11.50 N 2 = 1.496999 ν 2 = 81.5
R 3 = -1278.737 D 3 = 0.15
R 4 = 53.838 D 4 = 6.11 N 3 = 1.603112 ν 3 = 60.6
R 5 = 116.128 D 5 = 可変
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 39.623 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 10.924 D 8 = 5.93
R 9 = -37.506 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 49.633 D10 = 0.15
R11 = 19.410 D11 = 4.05 N 7 = 1.846660 ν 7 = 23.9
R12 = -35.042 D12 = 0.26
R13 = -28.647 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 43.833 D14 = 可変
R15 = 絞り D15 = 0.44
R16 = 24.594 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.117 D17 = 3.50 N10 = 1.487490 ν10 = 70.2
R18 = -54.279 D18 = 0.15
* R19 = 24.335 D19 = 2.30 N11 = 1.487490 ν11 = 70.2
R20 = -123.776 D20 = 4.93
R21 = -40.285 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -15.580 D22 = 0.85 N13 = 1.668729 ν13 = 37.6
R23 = 45.709 D23 = 2.37
R24 = -17.433 D24 = 0.90 N14 = 1.712995 ν14 = 53.9
R25 = -21.603 D25 = 可変
R26 = 105.718 D26 = 3.84 N15 = 1.583126 ν15 = 59.4
* R27 = -23.546 D27 = 0.19
R28 = 145.289 D28 = 5.70 N16 = 1.496999 ν16 = 81.5
R29 = -14.949 D29 = 1.25 N17 = 1.834000 ν17 = 37.2
R30 = -43.427
＼焦点距離 18.60 51.81 150.05
可変間隔＼
D 5 1.03 30.55 54.58
D14 19.65 9.82 3.38
D25 6.21 3.10 1.02
非球面係数
6面 : Ａ=0.00000e+00 Ｂ=-4.18311e-06 Ｃ=-1.92225e-08
Ｄ=6.25813e-10 E=-8.18116e-12 F=2.72191e-14
19面 : Ａ=0.00000e+00 Ｂ=-3.44811e-06 Ｃ=-6.23955e-08
Ｄ=4.91894e-10 E=0.00000e+00 F=0.00000e+00
27面 : ｋ=-5.44790e-01 Ａ=０ Ｂ=-2.46639e-06 Ｃ=-1.51795e-08
Ｄ=-1.03032e-10 E=1.99296e-14 F=1.27512e-15
数値実施例６
ｆ＝ 20.00〜 222.73 Ｆｎｏ＝ 3.62 〜 6.47 ２ω＝68.7 〜 7.0
R 1 = 89.782 D 1 = 1.70 N 1 = 1.805181 ν 1 = 25.4
R 2 = 57.571 D 2 = 8.00 N 2 = 1.496999 ν 2 = 81.5
R 3 = -502.581 D 3 = 0.15
R 4 = 50.662 D 4 = 4.41 N 3 = 1.569070 ν 3 = 71.3
R 5 = 117.089 D 5 = 可変
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 45.335 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 12.066 D 8 = 5.59
R 9 = -45.669 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 38.998 D10 = 0.13
R11 = 18.699 D11 = 4.50 N 7 = 1.846660 ν 7 = 23.9
R12 = -32.455 D12 = 0.48
R13 = -24.450 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 43.222 D14 = 可変
R15 = 絞り D15 = 0.52
R16 = 24.416 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.205 D17 = 3.80 N10 = 1.496999 ν10 = 81.5
R18 = -47.899 D18 = 0.12
* R19 = 34.489 D19 = 2.60 N11 = 1.487490 ν11 = 70.2
R20 = -54.169 D20 = 可変
R21 = -48.205 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -19.051 D22 = 0.85 N13 = 1.717004 ν13 = 47.9
R23 = 45.709 D23 = 可変
R24 = -14.733 D24 = 0.90 N14 = 1.772499 ν14 = 49.6
R25 = -21.770 D25 = 可変
R26 = 48.973 D26 = 4.92 N15 = 1.571351 ν15 = 53.0
* R27 = -18.761 D27 = 0.20
R28 = 68.001 D28 = 5.78 N16 = 1.496999 ν16 = 81.5
R29 = -17.108 D29 = 1.25 N17 = 1.834000 ν17 = 37.2
R30 = -645.011
＼焦点距離 20.00 63.90 222.73
可変間隔＼
D 5 3.70 31.32 54.51
D14 22.94 12.20 3.42
D20 5.06 9.68 12.15
D23 2.69 2.75 3.18
D25 7.89 3.22 0.40
非球面係数
6面 : Ａ=0.00000e+00 Ｂ=-1.00054e-05 Ｃ=-3.64976e-08
Ｄ=1.84043e-10 E=-2.20584e-13 F=1.06809e-15
19面 : Ａ=0.00000e+00 Ｂ=-2.59768e-06 Ｃ=-9.48448e-09
Ｄ=-1.28590e-10 E=0.00000e+00 F=0.00000e+00
27面 : ｋ=-4.47305e-01 Ａ=０ Ｂ=8.68243e-06 Ｃ=-6.69346e-09
Ｄ=1.07853e-10 E=1.70841e-14 F=-2.60912e-15
Numerical example 1
f = 18.60-192.00 Fno = 3.52-5.85 2ω = 72.6-8.1
R 1 = 89.769 D 1 = 1.70 N 1 = 1.846660 ν 1 = 23.9
R 2 = 57.586 D 2 = 8.55 N 2 = 1.496999 ν 2 = 81.5
R 3 = -445.084 D 3 = 0.15
R 4 = 49.297 D 4 = 4.54 N 3 = 1.603112 ν 3 = 60.6
R 5 = 115.481 D 5 = variable
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 43.236 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 11.637 D 8 = 6.19
R 9 = -41.956 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 40.531 D10 = 0.13
R11 = 19.617 D11 = 4.45 N 7 = 1.846660 ν 7 = 23.9
R12 = -32.642 D12 = 0.40
R13 = -25.574 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 44.778 D14 = variable
R15 = Aperture D15 = 0.59
R16 = 24.884 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.220 D17 = 4.25 N10 = 1.487490 ν10 = 70.2
R18 = -47.844 D18 = 0.12
* R19 = 30.455 D19 = 3.05 N11 = 1.487490 ν11 = 70.2
R20 = -59.065 D20 = variable
R21 = -53.973 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -19.278 D22 = 0.85 N13 = 1.717004 ν13 = 47.9
R23 = 45.709 D23 = Variable
R24 = -15.139 D24 = 0.90 N14 = 1.772499 ν14 = 49.6
R25 = -21.730 D25 = variable
R26 = 49.761 D26 = 5.03 N15 = 1.583126 ν15 = 59.4
* R27 = -19.986 D27 = 0.20
R28 = 75.995 D28 = 5.70 N16 = 1.496999 ν16 = 81.5
R29 = -16.551 D29 = 1.25 N17 = 1.834000 ν17 = 37.2
R30 = -228.192
\ Focal length 18.60 58.65 192.00
Variable interval \
D 5 1.72 28.76 50.63
D14 21.44 11.06 3.51
D20 4.67 9.28 11.77
D23 2.81 2.87 3.29
D25 8.02 3.34 0.43
Aspheric coefficient
6th: A = 0.00000e + 00 B = -6.88515e-06 C = 1.12679e-08
D = -4.74649e-10 E = 3.26089e-12 F = -7.10506e-15
19th: A = 0.00000e + 00 B = -6.56788e-07 C = 1.20029e-08
D = -1.10145e-10 E = 0.00000e + 00 F = 0.00000e + 00
27th: k = -6.36581e-01 A = 0 B = 3.10394e-06 C = 5.69153e-09
D = -1.17025e-10 E = 1.65775e-13 F = -1.97327e-16
Numerical example 2
f = 18.60-192.00 Fno = 3.62-6.23 2ω = 72.6-8.1
R 1 = 89.461 D 1 = 1.55 N 1 = 1.846660 ν 1 = 23.9
R 2 = 58.885 D 2 = 8.50 N 2 = 1.496999 ν 2 = 81.5
R 3 = -421.441 D 3 = 0.15
R 4 = 50.256 D 4 = 4.32 N 3 = 1.603112 ν 3 = 60.6
R 5 = 104.305 D 5 = Variable
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 47.233 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 11.874 D 8 = 6.53
R 9 = -42.131 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 49.410 D10 = 0.15
R11 = 20.219 D11 = 4.70 N 7 = 1.846660 ν 7 = 23.9
R12 = -35.707 D12 = 0.23
R13 = -31.226 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 38.685 D14 = variable
R15 = Aperture D15 = 0.58
R16 = 24.913 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.228 D17 = 3.50 N10 = 1.487490 ν10 = 70.2
R18 = -35.784 D18 = 0.15
R19 = 26.590 D19 = 2.30 N11 = 1.487490 ν11 = 70.2
R20 = -72.424 D20 = variable
R21 = -43.112 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -17.123 D22 = 0.85 N13 = 1.673506 ν13 = 41.5
R23 = 45.709 D23 = 2.33
R24 = -15.359 D24 = 0.90 N14 = 1.712995 ν14 = 53.9
R25 = -32.502 D25 = variable
R26 = 102.912 D26 = 4.22 N15 = 1.583126 ν15 = 59.4
* R27 = -17.104 D27 = 0.19
R28 = 79.119 D28 = 5.70 N16 = 1.496999 ν16 = 81.5
R29 = -14.328 D29 = 1.25 N17 = 1.834807 ν17 = 42.7
R30 = -117.678 D30 = 1.00
R31 = -39.286 D31 = 2.00 N18 = 1.487490 ν18 = 70.2
R32 = -31.432
\ Focal length 18.60 59.39 192.00
Variable interval \
D 5 1.79 30.12 53.17
D14 24.73 12.13 3.48
D20 5.07 8.88 11.05
D25 6.52 2.70 0.53
Aspheric coefficient
6th: A = 0.00000e + 00 B = -1.01380e-05 C = 8.38266e-09
D = -5.59245e-10 E = 3.41480e-12 F = -6.96063e-15
27th: k = -2.41555e-01 A = 0 B = 7.47928e-06 C = 1.13008e-09
D = -2.03460e-10 E = 6.58968e-13 F = 2.31317e-15
Numerical Example 3
f = 18.60 to 190.00 Fno = 3.62 to 6.20 2ω = 72.6 to 8.2
R 1 = 89.543 D 1 = 1.55 N 1 = 1.846660 ν 1 = 23.9
R 2 = 58.704 D 2 = 8.50 N 2 = 1.496999 ν 2 = 81.5
R 3 = -414.639 D 3 = 0.15
R 4 = 49.683 D 4 = 5.08 N 3 = 1.603112 ν 3 = 60.6
R 5 = 106.385 D 5 = variable
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 46.711 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 11.810 D 8 = 6.63
R 9 = -40.202 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 48.130 D10 = 0.15
R11 = 20.032 D11 = 5.09 N 7 = 1.846660 ν 7 = 23.9
R12 = -34.638 D12 = 0.35
R13 = -29.698 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 38.065 D14 = variable
R15 = Aperture D15 = 0.92
R16 = 25.368 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.199 D17 = 3.50 N10 = 1.487490 ν10 = 70.2
R18 = -35.355 D18 = 0.15
R19 = 26.513 D19 = 2.30 N11 = 1.487490 ν11 = 70.2
R20 = -77.107 D20 = variable
R21 = -44.181 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -16.797 D22 = 0.85 N13 = 1.696542 ν13 = 41.9
R23 = 45.709 D23 = 2.42
R24 = -15.548 D24 = 0.90 N14 = 1.712995 ν14 = 53.9
R25 = -26.487 D25 = variable
R26 = 98.159 D26 = 4.36 N15 = 1.583126 ν15 = 59.4
* R27 = -18.399 D27 = 0.19
R28 = 126.691 D28 = 5.70 N16 = 1.438750 ν16 = 95.0
R29 = -14.791 D29 = 1.25 N17 = 1.804398 ν17 = 39.6
R30 = -52.123
\ Focal length 18.60 57.73 190.00
Variable interval \
D 5 1.14 28.21 51.31
D14 21.96 10.75 2.69
D20 5.03 9.45 12.03
D25 7.60 3.17 0.59
Aspheric coefficient
6th: A = 0.00000e + 00 B = -1.00987e-05 C = 4.69166e-09
D = -3.05264e-10 E = 1.48443e-12 F = -2.56565e-15
27th: k = -3.78417e-01 A = 0 B = 9.97785e-07 C = -3.51999e-09
D = -1.26563e-10 E = 7.57633e-14 F = -5.96396e-16
Numerical Example 4
f = 18.60-192.00 Fno = 3.62-6.23 2ω = 72.6-8.1
R 1 = 89.461 D 1 = 1.55 N 1 = 1.846660 ν 1 = 23.9
R 2 = 58.885 D 2 = 8.50 N 2 = 1.496999 ν 2 = 81.5
R 3 = -421.441 D 3 = 0.15
R 4 = 50.256 D 4 = 4.32 N 3 = 1.603112 ν 3 = 60.6
R 5 = 104.305 D 5 = Variable
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 47.233 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 11.874 D 8 = 6.53
R 9 = -42.131 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 49.410 D10 = 0.15
R11 = 20.219 D11 = 4.70 N 7 = 1.846660 ν 7 = 23.9
R12 = -35.707 D12 = 0.23
R13 = -31.226 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 38.685 D14 = variable
R15 = Aperture D15 = 0.58
R16 = 24.913 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.228 D17 = 3.50 N10 = 1.487490 ν10 = 70.2
R18 = -35.784 D18 = 0.15
R19 = 26.590 D19 = 2.30 N11 = 1.487490 ν11 = 70.2
R20 = -72.424 D20 = variable
R21 = -43.112 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -17.123 D22 = 0.85 N13 = 1.673506 ν13 = 41.5
R23 = 45.709 D23 = 2.33
R24 = -15.359 D24 = 0.90 N14 = 1.712995 ν14 = 53.9
R25 = -32.502 D25 = variable
R26 = 102.912 D26 = 4.22 N15 = 1.583126 ν15 = 59.4
* R27 = -17.104 D27 = 0.19
R28 = 79.119 D28 = 5.70 N16 = 1.496999 ν16 = 81.5
R29 = -14.328 D29 = 1.25 N17 = 1.834807 ν17 = 42.7
R30 = -117.678 D30 = 1.00
R31 = -39.286 D31 = 2.00 N18 = 1.487490 ν18 = 70.2
R32 = -31.432
\ Focal length 18.60 59.39 192.00
Variable interval \
D 5 1.79 30.12 53.17
D14 24.73 12.13 3.48
D20 5.07 8.88 11.05
D25 6.52 2.70 0.53
Aspheric coefficient
6th: A = 0.00000e + 00 B = -1.01380e-05 C = 8.38266e-09
D = -5.59245e-10 E = 3.41480e-12 F = -6.96063e-15
27th: k = -2.41555e-01 A = 0 B = 7.47928e-06 C = 1.13008e-09
D = -2.03460e-10 E = 6.58968e-13 F = 2.31317e-15
Numerical Example 5
f = 18.60 to 150.05 Fno = 3.62 to 5.70 2ω = 72.6 to 10.4
R 1 = 86.804 D 1 = 1.55 N 1 = 1.846660 ν 1 = 23.9
R 2 = 60.219 D 2 = 11.50 N 2 = 1.496999 ν 2 = 81.5
R 3 = -1278.737 D 3 = 0.15
R 4 = 53.838 D 4 = 6.11 N 3 = 1.603112 ν 3 = 60.6
R 5 = 116.128 D 5 = variable
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 39.623 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 10.924 D 8 = 5.93
R 9 = -37.506 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 49.633 D10 = 0.15
R11 = 19.410 D11 = 4.05 N 7 = 1.846660 ν 7 = 23.9
R12 = -35.042 D12 = 0.26
R13 = -28.647 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 43.833 D14 = variable
R15 = Aperture D15 = 0.44
R16 = 24.594 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.117 D17 = 3.50 N10 = 1.487490 ν10 = 70.2
R18 = -54.279 D18 = 0.15
* R19 = 24.335 D19 = 2.30 N11 = 1.487490 ν11 = 70.2
R20 = -123.776 D20 = 4.93
R21 = -40.285 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -15.580 D22 = 0.85 N13 = 1.668729 ν13 = 37.6
R23 = 45.709 D23 = 2.37
R24 = -17.433 D24 = 0.90 N14 = 1.712995 ν14 = 53.9
R25 = -21.603 D25 = variable
R26 = 105.718 D26 = 3.84 N15 = 1.583126 ν15 = 59.4
* R27 = -23.546 D27 = 0.19
R28 = 145.289 D28 = 5.70 N16 = 1.496999 ν16 = 81.5
R29 = -14.949 D29 = 1.25 N17 = 1.834000 ν17 = 37.2
R30 = -43.427
\ Focal length 18.60 51.81 150.05
Variable interval \
D 5 1.03 30.55 54.58
D14 19.65 9.82 3.38
D25 6.21 3.10 1.02
Aspheric coefficient
6th: A = 0.00000e + 00 B = -4.18311e-06 C = -1.92225e-08
D = 6.25813e-10 E = -8.18116e-12 F = 2.72191e-14
19th: A = 0.00000e + 00 B = -3.44811e-06 C = -6.23955e-08
D = 4.91894e-10 E = 0.00000e + 00 F = 0.00000e + 00
27th surface: k = -5.44790e-01 A = 0 B = -2.46639e-06 C = -1.51795e-08
D = -1.03032e-10 E = 1.99296e-14 F = 1.27512e-15
Numerical Example 6
f = 20.00 to 222.73 Fno = 3.62 to 6.47 2ω = 68.7 to 7.0
R 1 = 89.782 D 1 = 1.70 N 1 = 1.805181 ν 1 = 25.4
R 2 = 57.571 D 2 = 8.00 N 2 = 1.496999 ν 2 = 81.5
R 3 = -502.581 D 3 = 0.15
R 4 = 50.662 D 4 = 4.41 N 3 = 1.569070 ν 3 = 71.3
R 5 = 117.089 D 5 = variable
* R 6 = 39.105 D 6 = 0.05 N 4 = 1.516400 ν 4 = 52.2
R 7 = 45.335 D 7 = 1.15 N 5 = 1.804000 ν 5 = 46.6
R 8 = 12.066 D 8 = 5.59
R 9 = -45.669 D 9 = 1.00 N 6 = 1.834807 ν 6 = 42.7
R10 = 38.998 D10 = 0.13
R11 = 18.699 D11 = 4.50 N 7 = 1.846660 ν 7 = 23.9
R12 = -32.455 D12 = 0.48
R13 = -24.450 D13 = 0.90 N 8 = 1.882997 ν 8 = 40.8
R14 = 43.222 D14 = variable
R15 = Aperture D15 = 0.52
R16 = 24.416 D16 = 0.80 N 9 = 1.805181 ν 9 = 25.4
R17 = 15.205 D17 = 3.80 N10 = 1.496999 ν10 = 81.5
R18 = -47.899 D18 = 0.12
* R19 = 34.489 D19 = 2.60 N11 = 1.487490 ν11 = 70.2
R20 = -54.169 D20 = variable
R21 = -48.205 D21 = 1.70 N12 = 1.846660 ν12 = 23.9
R22 = -19.051 D22 = 0.85 N13 = 1.717004 ν13 = 47.9
R23 = 45.709 D23 = Variable
R24 = -14.733 D24 = 0.90 N14 = 1.772499 ν14 = 49.6
R25 = -21.770 D25 = variable
R26 = 48.973 D26 = 4.92 N15 = 1.571351 ν15 = 53.0
* R27 = -18.761 D27 = 0.20
R28 = 68.001 D28 = 5.78 N16 = 1.496999 ν16 = 81.5
R29 = -17.108 D29 = 1.25 N17 = 1.834000 ν17 = 37.2
R30 = -645.011
\ Focal length 20.00 63.90 222.73
Variable interval \
D 5 3.70 31.32 54.51
D14 22.94 12.20 3.42
D20 5.06 9.68 12.15
D23 2.69 2.75 3.18
D25 7.89 3.22 0.40
Aspheric coefficient
6th: A = 0.00000e + 00 B = -1.00054e-05 C = -3.64976e-08
D = 1.84043e-10 E = -2.20584e-13 F = 1.06809e-15
19th: A = 0.00000e + 00 B = -2.59768e-06 C = -9.48448e-09
D = -1.28590e-10 E = 0.00000e + 00 F = 0.00000e + 00
27th: k = -4.47305e-01 A = 0 B = 8.68243e-06 C = -6.69346e-09
D = 1.07853e-10 E = 1.70841e-14 F = -2.60912e-15
Ｌ１：第１群
Ｌ２：第２群
ＬＣ：中間レンズユニット
ＬＲ：後方レンズ群
ＳＰ：絞り
ＩＰ：像面
ｄ：ｄ線
ｇ：ｇ線
ΔＳ：サジタル像面
ΔＭ：メリジオナル像面
Ｈ：像高
Ｇｉｓ：防振用のレンズ部
L1: First lens unit L2: Second lens unit LC: Intermediate lens unit LR: Rear lens unit SP: Aperture IP: Image plane d: d line g: g line ΔS: sagittal image plane ΔM: meridional image plane H: image height Gis : Anti-vibration lens
Claims (11)
該中間レンズユニットは、光軸に対し垂直方向の成分を持つように移動して全系が形成する像を光軸と垂直方向に変位させる負の屈折力のレンズ部を有しており、
該後方レンズ群の焦点距離をｆｒｐ、
該後方レンズ群中の１つの正レンズの材料のアッベ数をνｄｐ、
望遠端におけるズームレンズの焦点距離をｆｔ
とするとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３
７２＜νｄｐ＜９７
なる条件を満足することを特徴とするズームレンズ。 In order from the object side to the image side, there are a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and one or more lens units that move during zooming. An intermediate lens unit having a positive refractive power and a rear lens group having a positive refractive power, and the distance between the first lens group and the second lens group at the telephoto end is wider than the wide-angle end, and the second lens group A zoom lens in which each lens group moves so that a distance between the intermediate lens unit and the intermediate lens unit is narrow, and a distance between the intermediate lens unit and the rear lens group is narrow,
The intermediate lens unit includes a lens unit having a negative refractive power that moves so as to have a component perpendicular to the optical axis and displaces an image formed by the entire system in a direction perpendicular to the optical axis.
The focal length of the rear lens group is frp,
The Abbe number of the material of one positive lens in the rear lens group is νdp,
Ft is the focal length of the zoom lens at the telephoto end
And when
0.05 <frp / ft <0.3
72 <νdp <97
A zoom lens characterized by satisfying the following conditions:
広角端から望遠端へのズーミングにおける該後方レンズ群の光軸方向の移動量をＭｒｐ、
該後方レンズ群の焦点距離をｆｒｐ、
該後方レンズ群中の１つの正レンズの材料のアッベ数をνｄｐ、
望遠端におけるズームレンズの焦点距離をｆｔ
とするとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３
７２＜νｄｐ＜９７
−０．３＜Ｍｒｐ／ｆｔ＜−０．０５
なる条件を満足することを特徴とするズームレンズ。 In order from the object side to the image side, there are a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and one or more lens units that move during zooming. An intermediate lens unit having a positive refractive power and a rear lens group having a positive refractive power, and the distance between the first lens group and the second lens group at the telephoto end is wider than the wide-angle end, and the second lens group A zoom lens in which each lens group moves so that a distance between the intermediate lens unit and the intermediate lens unit is narrow, and a distance between the intermediate lens unit and the rear lens group is narrow,
The amount of movement of the rear lens group in the optical axis direction during zooming from the wide-angle end to the telephoto end is Mrp,
The focal length of the rear lens group is frp,
The Abbe number of the material of one positive lens in the rear lens group is νdp,
Ft is the focal length of the zoom lens at the telephoto end
And when
0.05 <frp / ft <0.3
72 <νdp <97
−0.3 <Mrp / ft <−0.05
A zoom lens characterized by satisfying the following conditions:
該中間レンズユニットは、物体側から像側へ順に正の屈折力の第ｒｐ１レンズ群、負の屈折力の第ｒｎ１レンズ群を有し、
該第ｒｎ１レンズ群は光軸に対し垂直方向の成分を持つように移動して全系が形成する像を光軸と垂直方向に変位させる負の屈折力の第Ｇｉｓレンズ部を有しており、
該後方レンズ群の焦点距離をｆｒｐ、
該第Ｇｉｓレンズ部の焦点距離をｆｉｓ、
望遠端におけるズームレンズの焦点距離をｆｔ
とするとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３
−０．４＜ｆｉｓ／ｆｔ＜−０．１
−０．３＜Ｍｒｐ／ｆｔ＜−０．０５
なる条件を満足することを特徴とするズームレンズ。 In order from the object side to the image side, the first lens group having a positive refractive power, the second lens group having a negative refractive power, and one or more lens groups that move during zooming, and are positive as a whole in the entire zoom range. An intermediate lens unit having a positive refractive power and a rear lens group having a positive refractive power, and the distance between the first lens group and the second lens group at the telephoto end is wider than the wide-angle end, and the second lens group A zoom lens in which each lens group moves so that a distance between the intermediate lens unit and the intermediate lens unit is narrow, and a distance between the intermediate lens unit and the rear lens group is narrow,
The intermediate lens unit has an rp1 lens group having a positive refractive power and an rn1 lens group having a negative refractive power in order from the object side to the image side.
The rn1 lens unit has a negative refracting power Gis lens portion that moves so as to have a component perpendicular to the optical axis and displaces an image formed by the entire system in a direction perpendicular to the optical axis. ,
The focal length of the rear lens group is frp,
The focal length of the first Gis lens unit is fis,
Ft is the focal length of the zoom lens at the telephoto end
And when
0.05 <frp / ft <0.3
−0.4 <fis / ft <−0.1
−0.3 <Mrp / ft <−0.05
A zoom lens characterized by satisfying the following conditions:
１．１＜ｆｉｓ／ｆｒｎ１＜３．０
なる条件を満足することを特徴とする請求項３のズームレンズ。 When the focal length of the rn1 lens group is frn1, 1.1 <fis / frn1 <3.0
The zoom lens according to claim 3, wherein the following condition is satisfied.
該中間レンズユニットは、物体側から像側へ順に正の屈折力の第ｒｐ１レンズ群、負の屈折力の第ｒｎ１１レンズ群、負の屈折力の第ｒｎ１２レンズ群を有し、該第ｒｎ１１レンズ群は、光軸に対し垂直方向の成分を持つように移動して全系が形成する像を光軸と垂直方向に変位させており、
該後方レンズ群の焦点距離をｆｒｐ、
該第ｒｎ１１レンズ群の焦点距離をｆｒｎ１１、
望遠端におけるズームレンズの焦点距離をｆｔ
とするとき、
０．０５＜ｆｒｐ／ｆｔ＜０．３
−０．４＜ｆｒｎ１１／ｆｔ＜−０．１
なる条件を満足することを特徴とするズームレンズ。 In order from the object side to the image side, the first lens group having a positive refractive power, the second lens group having a negative refractive power, and one or more lens groups that move during zooming, and are positive as a whole in the entire zoom range. An intermediate lens unit having a positive refractive power and a rear lens group having a positive refractive power, and the distance between the first lens group and the second lens group at the telephoto end is wider than the wide-angle end, and the second lens group A zoom lens in which each lens group moves so that a distance between the intermediate lens unit and the intermediate lens unit is narrow, and a distance between the intermediate lens unit and the rear lens group is narrow,
The intermediate lens unit includes, in order from the object side to the image side, an rp1 lens group having a positive refractive power, an rn11 lens group having a negative refractive power, and an rn12 lens group having a negative refractive power, and the rn11 lens The group moves so as to have a component perpendicular to the optical axis and displaces the image formed by the entire system in the direction perpendicular to the optical axis.
The focal length of the rear lens group is frp,
The focal length of the rn11 lens group is frn11,
Ft is the focal length of the zoom lens at the telephoto end
And when
0.05 <frp / ft <0.3
−0.4 <frn11 / ft <−0.1
A zoom lens characterized by satisfying the following conditions:
該後方レンズ群の焦点距離をｆｒｐ、
とするとき
０．０５＜ｆｐ／ｆｒｐ＜２．０
なる条件を満足することを特徴とする請求項１から５のいずれか１項のズームレンズ。 The rear lens group includes one or more positive lenses and one negative lens, and the focal length of the positive lens having the lowest material dispersion among the one or more positive lenses is fp,
The focal length of the rear lens group is frp,
When 0.05 <fp / frp <2.0
The zoom lens according to claim 1, wherein the following condition is satisfied.
３４＜νｄｎ＜６０
なる条件を満足することを特徴とする請求項１から６のいずれか１項のズームレンズ。 The rear lens group includes one or more positive lenses and one negative lens. When the Abbe number of the material of the negative lens is νdn, 34 <νdn <60.
The zoom lens according to claim 1, wherein the following condition is satisfied.
−０．１５＜ｆ２／ｆｔ＜−０．０４
なる条件を満足することを特徴とする請求項１から７のいずれか１項のズームレンズ。 When the focal length of the second lens group is f2 and the focal length of the zoom lens at the telephoto end is ft, −0.15 <f2 / ft <−0.04
The zoom lens according to claim 1, wherein the following condition is satisfied.
０．３＜ｆ１／ｆｔ＜０．８
なる条件を満足することを特徴とする請求項１から８のいずれか１項のズームレンズ。 When the focal length of the first lens group is f1 and the focal length of the zoom lens at the telephoto end is ft, 0.3 <f1 / ft <0.8
The zoom lens according to claim 1, wherein the following condition is satisfied.
An image pickup apparatus comprising: the zoom lens according to claim 1; and a solid-state image pickup device that picks up an image formed by the zoom lens.
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| JP2008015251A5 JP2008015251A5 (en) | 2009-08-13 |
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