JP6351327B2 - Zoom lens and imaging apparatus having the same - Google Patents

Zoom lens and imaging apparatus having the same Download PDF

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JP6351327B2
JP6351327B2 JP2014063765A JP2014063765A JP6351327B2 JP 6351327 B2 JP6351327 B2 JP 6351327B2 JP 2014063765 A JP2014063765 A JP 2014063765A JP 2014063765 A JP2014063765 A JP 2014063765A JP 6351327 B2 JP6351327 B2 JP 6351327B2
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吉見　隆大
隆大 吉見
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本発明は、ズームレンズ及びそれを有する撮像装置に関し、特に放送用テレビカメラ、映画用カメラ、ビデオカメラ、デジタルスチルカメラ、銀塩写真用カメラ等の撮像装置の撮像光学系として好適なものである。   The present invention relates to a zoom lens and an image pickup apparatus having the same, and is particularly suitable as an image pickup optical system of an image pickup apparatus such as a broadcast television camera, a movie camera, a video camera, a digital still camera, and a silver salt photographic camera. .

近年、撮像装置に用いられる撮像光学系には、全系が小型軽量で、広画角・高ズーム比でかつ高い光学性能を有したズームレンズが要望されている。広画角、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、全体として５つのレンズ群により構成されるポジティブリード型の５群ズームレンズが知られている。５群ズームレンズとして、物体側から像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、正の屈折力の第３レンズ群、正の屈折力の第４レンズ群、正の屈折力の第５レンズ群が知られている（特許文献１，２）。   In recent years, there has been a demand for an imaging optical system used in an imaging apparatus that is a zoom lens having a small size and light weight, a wide angle of view, a high zoom ratio, and high optical performance. As a zoom lens having a wide angle of view and a high zoom ratio, a positive lead type five-unit zoom lens is known which includes a lens unit having a positive refractive power closest to the object side and is composed of five lens units as a whole. . As a five-group zoom lens, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a first lens group having a positive refractive power. A four lens group and a fifth lens group having a positive refractive power are known (Patent Documents 1 and 2).

特許文献１，２ではバリエータとコンペンセータの機能を持つ変倍部を第２，第３，第４レンズ群で構成し、ズーミングに際して３つの可動レンズ群を、互いに異なった軌跡で移動したテレビカメラに好適な５群ズームレンズを開示している。特許文献１では、広角端の撮影画角が６０°〜７０°程度、ズーム比１０〜２０程度のズームレンズを開示している。特許文献２では、広角端の撮影画角６０度程度、ズーム比５４程度のズームレンズを開示している。   In Patent Documents 1 and 2, the zoom unit having the functions of a variator and a compensator is composed of the second, third, and fourth lens groups, and the three movable lens groups are moved to a TV camera that has moved along different paths during zooming. A preferred 5 group zoom lens is disclosed. Patent Document 1 discloses a zoom lens having a shooting angle of view at the wide-angle end of approximately 60 ° to 70 ° and a zoom ratio of approximately 10 to 20. Patent Document 2 discloses a zoom lens having a shooting angle of view of about 60 degrees at the wide-angle end and a zoom ratio of about 54.

特開平７−２４８４４９号公報JP-A-7-248449 特開２００９−１２８４９１号公報JP 2009-128491 A

前述した５群ズームレンズは、広画角化及び高ズーム比化が比較的容易である。しかしながら広画角化及び高ズーム比化を維持しつつ、高い光学性能を得るには各レンズ群の屈折力、レンズ構成等を適切に設定することが重要になってくる。特に第１レンズ群の屈折力や変倍レンズ群としての第２、第３レンズ群の屈折力、そして第２レンズ群と第３レンズ群の結像倍率等を適切に設定することが重要になってくる。これらの構成を適切に設定しないと、広画角かつ高ズーム比で全ズーム範囲にわたり高い光学性能を有した小型のズームレンズを得るのが難しくなってくる。   The above-mentioned 5-group zoom lens can relatively easily achieve a wide angle of view and a high zoom ratio. However, in order to obtain high optical performance while maintaining a wide angle of view and a high zoom ratio, it is important to appropriately set the refractive power of each lens group, the lens configuration, and the like. In particular, it is important to appropriately set the refractive power of the first lens group, the refractive power of the second and third lens groups as the variable power lens group, the imaging magnification of the second lens group and the third lens group, and the like. It becomes. If these configurations are not set appropriately, it becomes difficult to obtain a small zoom lens having a wide angle of view and a high zoom ratio and high optical performance over the entire zoom range.

例えば広画角化に伴い、前玉有効径が増大し、またズーミングに伴う諸収差の変動が増大してくる。また高ズーム比化に伴い、変倍用の移動レンズ群の移動量が増加し、レンズ全長が増大するとともに変倍に伴う諸収差の変動が増大してくる。   For example, as the angle of view increases, the effective diameter of the front lens increases, and variations in various aberrations associated with zooming increase. As the zoom ratio increases, the amount of movement of the moving lens group for zooming increases, so that the total lens length increases and the variation of various aberrations accompanying zooming increases.

本発明は、例えば、広画角、高ズーム比、全ズーム範囲にわたる高い光学性能、小型の点で有利なズームレンズの提供を目的とする。 The present invention is, for example, a wide field angle, a high zoom ratio, the zoom range to the high optical performance that cotton, and to provide advantageous zoom lens in a small point.

本発明のズームレンズは、 物体側から像側へ順に、ズーミングのためには不動の正の屈折力の第１レンズ群、ズーミングのために移動する負の屈折力の第２レンズ群、ズーミングのために移動する正の屈折力の第３レンズ群、ズーミングのために移動する正の屈折力の第４レンズ群、ズーミングのためには不動の正の屈折力の第５レンズ群より構成されるズームレンズであって、
前記第３レンズ群は、負レンズと正レンズとを接合してなる接合レンズより構成され、
広角端における前記第２レンズ群と前記第３レンズ群との間隔をＬ２３Ｗとし、望遠端における前記第２レンズ群と前記第３レンズ群との間隔をＬ２３Ｔとし、広角端における前記第２レンズ群と前記第３レンズ群との合成焦点距離をｆ２３Ｗとし、望遠端における前記第２レンズ群と前記第３レンズ群との合成焦点距離をｆ２３Ｔとし、前記第１レンズ群の焦点距離をｆ１とし、前記正レンズの材料のｄ線におけるアッベ数をνｄｐとし、前記負レンズの材料のｄ線におけるアッベ数をνｄｎとして、
０．７５＜ｆ２３Ｔ／ｆ２３Ｗ＜１．００
０．０１＜Ｌ２３Ｔ／Ｌ２３Ｗ＜０．２０
−１５＜ｆ１／ｆ２３Ｗ＜−８
２０．０＜νｄｐ−νｄｎ＜３０．０
なる条件式を満足することを特徴としている。
この他、本発明のズームレンズは、物体側から像側へ順に、ズーミングのためには不動の正の屈折力の第１レンズ群、ズーミングのために移動する負の屈折力の第２レンズ群、ズーミングのために移動する正の屈折力の第３レンズ群、ズーミングのために移動する正の屈折力の第４レンズ群、ズーミングのためには不動の正の屈折力の第５レンズ群より構成されるズームレンズであって、
前記第３レンズ群は、負レンズと正レンズとを接合してなる接合レンズより構成され、
広角端における前記第２レンズ群と前記第３レンズ群との間隔をＬ２３Ｗとし、望遠端における前記第２レンズ群と前記第３レンズ群との間隔をＬ２３Ｔとし、広角端における前記第２レンズ群と前記第３レンズ群との合成焦点距離をｆ２３Ｗとし、望遠端における前記第２レンズ群と前記第３レンズ群との合成焦点距離をｆ２３Ｔとし、前記第１レンズ群の焦点距離をｆ１とし、前記正レンズの材料のｄ線におけるアッベ数をνｄｐとし、前記負レンズの材料のｄ線におけるアッベ数をνｄｎとして、
０．７５＜ｆ２３Ｔ／ｆ２３Ｗ＜１．００
０．０１＜Ｌ２３Ｔ／Ｌ２３Ｗ＜０．２０
−１５＜ｆ１／ｆ２３Ｗ＜−８．２
１５．０＜νｄｐ−νｄｎ＜３５．０
なる条件式を満足することを特徴としている。 The zoom lens according to the present invention includes, in order from the object side to the image side, a first lens unit having a positive refractive power that does not move for zooming, a second lens unit having a negative refractive power that moves for zooming , A third lens group having a positive refractive power that moves for zooming, a fourth lens group having a positive refractive power that moves for zooming , and a fifth lens group having a positive refractive power that does not move for zooming. a zoom lens,
The third lens group includes a cemented lens formed by cementing a negative lens and a positive lens,
The distance between the third lens group and the second lens group at the wide-angle end and L23w, the distance between the third lens group and the second lens group at the telephoto end and L23T, said at the wide angle end the second lens group wherein the composite focal length of the third lens group and F23W, a composite focal length of the second lens group at the telephoto end and the third lens group and F23T, the focal length of the first lens group is f1 and The Abbe number at the d-line of the material of the positive lens is νdp, and the Abbe number at the d-line of the material of the negative lens is νdn,
0.75 <f23T / f23W <1.00
0.01 <L23T / L23W <0.20
−15 <f1 / f23W <−8
20.0 <νdp−νdn <30.0
It satisfies the following conditional expression.
In addition, the zoom lens according to the present invention includes, in order from the object side to the image side, a first lens group having a positive refractive power that does not move for zooming, and a second lens group having a negative refractive power that moves for zooming. From a third lens group having positive refractive power that moves for zooming, a fourth lens group having positive refractive power that moves for zooming, and a fifth lens group having positive refractive power that does not move for zooming A zoom lens comprising:
The third lens group includes a cemented lens formed by cementing a negative lens and a positive lens,
The distance between the second lens group and the third lens group at the wide angle end is L23W, the distance between the second lens group and the third lens group at the telephoto end is L23T, and the second lens group at the wide angle end. And the third lens group is set to f23W, the combined focal length of the second lens group and the third lens group at the telephoto end is set to f23T, and the focal length of the first lens group is set to f1. The Abbe number at the d-line of the positive lens material is νdp, and the Abbe number at the d-line of the negative lens material is νdn,
0.75 <f23T / f23W <1.00
0.01 <L23T / L23W <0.20
−15 <f1 / f23W <−8.2
15.0 <νdp−νdn <35.0
It satisfies the following conditional expression.

本発明によれば、例えば、広画角、高ズーム比、全ズーム範囲にわたる高い光学性能、小型の点で有利なズームレンズが得られる。 According to the present invention, for example, a wide field angle, a high zoom ratio, high optical performance that cotton in the entire zoom range, an advantageous zoom lens in a small point is obtained.

数値実施例１の物体距離無限遠時の広角端におけるレンズ断面図Lens sectional view at the wide-angle end when the object distance is infinite in Numerical Example 1 （Ａ），（Ｂ），（Ｃ），（Ｄ） 数値実施例１の物体距離１３ｍの時の広角端、ｆ＝６７．５９、ｆ＝２９０．５９、望遠端での収差図(A), (B), (C), (D) Aberration diagrams at the wide-angle end, f = 67.59, f = 290.59, and the telephoto end when the object distance is 13 m in Numerical Example 1. 数値実施例２の物体距離無限遠時の広角端におけるレンズ断面図Lens sectional view at the wide-angle end when the object distance is infinite in Numerical Example 2 （Ａ），（Ｂ），（Ｃ），（Ｄ） 数値実施例２の物体距離１３ｍの時の広角端、ｆ＝６６．３６、ｆ＝２８２．８９、望遠端での収差図(A), (B), (C), (D) Aberration diagrams at the wide-angle end, f = 66.36, f = 282.89, and the telephoto end when the object distance is 13 m in Numerical Example 2. 本発明の撮像装置の概略図Schematic diagram of imaging device of the present invention 本発明のズームレンズのズーミングにおける移動軌跡の説明図Explanatory drawing of the movement locus in zooming of the zoom lens of the present invention

以下に、本発明の好ましい実施の形態を、添付の図面に基づいて詳細に説明する。まず、本発明のズームレンズの特徴について説明する。本発明のズームレンズは、物体側から像側へ順に、次のとおりである。ズーミングに際して不動でフォーカシング機能（合焦機能）を有する正の屈折力の第１レンズ群、ズーミングに際して移動する負の屈折力の第２レンズ群より構成される。更にズーミングに際して移動する正の屈折力の第３レンズ群、ズーミングに際して移動する正の屈折力の第４レンズ群と、ズーミングのためには不動の正の屈折力の第５レンズ群より構成される。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, features of the zoom lens of the present invention will be described. The zoom lens of the present invention is as follows in order from the object side to the image side. The first lens group has a positive refractive power that does not move during zooming and has a focusing function (focusing function), and the second lens group has a negative refractive power that moves during zooming. Further, the zoom lens includes a third lens group having a positive refractive power that moves during zooming, a fourth lens group having a positive refractive power that moves during zooming, and a fifth lens group having a positive refractive power that does not move for zooming. .

図１は本発明の実施例１（数値実施例１）のズームレンズの無限遠物体に合焦しているときの広角端（焦点距離：ｆ＝９．６ｍｍ）におけるレンズ断面図である。図２（Ａ）乃至（Ｄ）は数値実施例１の物体距離１３ｍに合焦しているときの広角端（焦点距離：ｆ＝９．６ｍｍ）、焦点距離：ｆ＝６７．５９ｍｍ、焦点距離：ｆ＝２９０．５９ｍｍ、望遠端（焦点距離：ｆ＝１０８２．６０ｍｍ）における収差図である。但し、焦点距離や物体距離は数値実施例の値をｍｍ単位で表したときの値である。また物体距離は像面からの距離である。これは以下の各実施例において全て同じである。   FIG. 1 is a lens cross-sectional view at the wide-angle end (focal length: f = 9.6 mm) when focusing on an object at infinity of the zoom lens according to Embodiment 1 (Numerical Embodiment 1) of the present invention. 2A to 2D show the wide-angle end (focal length: f = 9.6 mm), the focal length: f = 67.59 mm, the focal length when the object distance of the numerical example 1 is in focus of 13 m. : F = 290.59 mm, aberration diagram at the telephoto end (focal length: f = 1082.60 mm). However, the focal length and the object distance are values when the values of the numerical examples are expressed in mm. The object distance is a distance from the image plane. This is the same in all the following embodiments.

図３は本発明の実施例２（数値実施例２）のズームレンズの無限遠物体の合焦しているときの広角端（焦点距離：ｆ＝９．６ｍｍ）におけるレンズ断面図である。図４（Ａ）乃至（Ｄ）は数値実施例２の物体距離１３ｍに合焦しているときの広角端（焦点距離：ｆ＝９．６ｍｍ）、焦点距離：ｆ＝６６．３６ｍｍ、焦点距離：ｆ＝２８２．８９ｍｍ、望遠端（焦点距離：ｆ＝１０６０．２９ｍｍ）における収差図である。図５は本発明の撮像装置の概略図である。図６は本発明のズームレンズのズーミングにおける移動軌跡の説明図である。   FIG. 3 is a lens cross-sectional view at the wide-angle end (focal length: f = 9.6 mm) when an object at infinity is in focus in the zoom lens according to Embodiment 2 (Numerical Embodiment 2) of the present invention. 4A to 4D show the wide-angle end (focal length: f = 9.6 mm), the focal length: f = 66.36 mm, and the focal length when the object distance of the numerical example 2 is in focus of 13 m. : F = 282.89 mm, aberration diagram at the telephoto end (focal length: f = 1060.29 mm). FIG. 5 is a schematic view of the imaging apparatus of the present invention. FIG. 6 is an explanatory diagram of a movement locus in zooming of the zoom lens according to the present invention.

各実施例のレンズ断面図において、左側が物体側で右側が像側である。ズーミングに際してのレンズ群の移動軌跡は図６の矢印で示したとおりである。実施例１，２のレンズ断面図と図６において、Ｕ１はズーミングのためには不動の正の屈折力の第１レンズ群（前玉レンズ群）である。第１レンズ群Ｕ１は、フォーカシングに際してその一部又は全部のレンズ系が移動する。   In the lens cross-sectional views of each example, the left side is the object side and the right side is the image side. The movement trajectory of the lens group during zooming is as shown by the arrows in FIG. In the lens cross-sectional views of Examples 1 and 2 and FIG. 6, U1 is a first lens unit (front lens unit) having positive refractive power that does not move for zooming. In the first lens unit U1, part or all of the lens system moves during focusing.

Ｕ２はズーミングに際して移動する負の屈折力の第２レンズ群（バリエータ）であり、広角端から望遠端へのズーミングに際して光軸上を像側へ単調に移動する。Ｕ３はズーミングに際して移動する正の屈折力の第３レンズ群（バリエータ）であり、広角端から望遠端へのズーミングに際して光軸上を像側に凸状の軌跡で移動する。Ｕ４はズーミングに際して移動する正の屈折力の第４レンズ群（コンペンセータ）であり、広角端から望遠端へのズーミングに際して変倍に伴う像面変動を補正するために光軸上を物体側へ非直線的に移動する。   U2 is a second lens unit (variator) having a negative refractive power that moves during zooming, and moves monotonously on the optical axis toward the image side during zooming from the wide-angle end to the telephoto end. U3 is a third lens unit (variator) having a positive refractive power that moves during zooming, and moves on the optical axis along a locus convex toward the image side during zooming from the wide-angle end to the telephoto end. U4 is a fourth lens unit (compensator) having a positive refractive power that moves during zooming, and is not moved on the optical axis to the object side in order to correct image plane variation accompanying zooming from zooming to wide-angle end to telephoto end. Move linearly.

各実施例では第２レンズ群Ｕ２と第３レンズ群Ｕ３と第４レンズ群Ｕ４で変倍系を構成している。Ｕ５はズーミングのためには不動の正の屈折力の第５レンズ群（リレーレンズ群）であり、結像作用を有する。ＳＰは絞り（開口絞り）であり、第５レンズ群Ｕ５の物体側に配置されている。   In each embodiment, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. U5 is a fifth lens group (relay lens group) having a positive refractive power that does not move for zooming, and has an imaging function. SP is a stop (aperture stop), which is disposed on the object side of the fifth lens unit U5.

Ｐは色分解プリズムや光学フィルタ−等であり、同図ではガラスブロックとして示している。ＩＰは撮像面であり、ズームレンズで形成された像を受光し、光電変換する固体撮像素子（光電変換素子）の撮像面に相当している。収差図において、球面収差における実線と二点鎖線は各々ｅ線，ｇ線である。非点収差における点線と実線は各々メリディオナル像面，サジタル像面である。倍率色収差はｇ線によって表している。ωは半画角（度）、ＦｎｏはＦナンバーである。球面収差は０．４ｍｍ、非点収差は０．４ｍｍ、歪曲は５％、倍率色収差は０．１ｍｍのスケールで描かれている。   P is a color separation prism, an optical filter, or the like, and is shown as a glass block in FIG. IP denotes an imaging surface, which corresponds to an imaging surface of a solid-state imaging device (photoelectric conversion device) that receives an image formed by a zoom lens and performs photoelectric conversion. In the aberration diagrams, the solid line and the two-dot chain line in the spherical aberration are the e-line and the g-line, respectively. The dotted line and solid line in astigmatism are the meridional image surface and the sagittal image surface, respectively. Lateral chromatic aberration is represented by the g-line. ω is a half angle of view (degree), and Fno is an F number. The spherical aberration is 0.4 mm, the astigmatism is 0.4 mm, the distortion is 5%, and the lateral chromatic aberration is drawn on a scale of 0.1 mm.

尚、以下の各実施例において広角端と望遠端は変倍用レンズ群（第２レンズ群Ｕ２）が機構上、光軸上を移動可能な範囲の両端に位置したときのズーム位置をいう。   In each of the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the zoom lens unit (second lens unit U2) is positioned at both ends of a range that can move on the optical axis because of the mechanism.

各実施例のズームレンズは、物体側から像側へ順に、ズーミングのためには不動の正の屈折力の第１レンズ群Ｕ１、変倍用の負の屈折力の第２レンズ群Ｕ２、変倍用の正の屈折力の第３レンズ群Ｕ３を有する。更に変倍に伴う像面変動を補正するために移動する正の屈折力の第４レンズ群Ｕ４を有する。更にズーミングのためには不動の正の屈折力の第５レンズ群Ｕ５から構成されている。   The zoom lens of each embodiment includes, in order from the object side to the image side, a first lens unit U1 having a positive refractive power that does not move for zooming, a second lens unit U2 having a negative refractive power for zooming, The third lens unit U3 has a positive refracting power for magnification. Furthermore, it has a fourth lens unit U4 having a positive refractive power that moves in order to correct image plane fluctuations accompanying zooming. Further, for zooming, the fifth lens unit U5 has a fixed positive refractive power.

そして広角端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔をＬ２３Ｗ、望遠端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔をＬ２３Ｔとるす。広角端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の合成焦点距離をｆ２３Ｗ、望遠端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の合成焦点距離をｆ２３Ｔとする。第１レンズ群Ｕ１の焦点距離をｆ１とする。   The distance between the second lens group U2 and the third lens group U3 at the wide-angle end is L23W, and the distance between the second lens group U2 and the third lens group U3 at the telephoto end is L23T. The combined focal length of the second lens unit U2 and the third lens unit U3 at the wide angle end is f23W, and the combined focal length of the second lens unit U2 and the third lens unit U3 at the telephoto end is f23T. Let the focal length of the first lens unit U1 be f1.

このとき、
０．７５＜ｆ２３Ｔ／ｆ２３Ｗ＜１．００ ・・・（１）
０．０１＜Ｌ２３Ｔ／Ｌ２３Ｗ＜０．２０ ・・・（２）
−１５＜ｆ１／ｆ２３Ｗ＜−８ ・・・（３）
なる条件式を満足する。ここで条件式（３）は後述する条件式（３ａ）の上限値を用いて
−１５＜ｆ１／ｆ２３ｗ、−８．２ ・・・（３ｘ）
としても良い。 At this time,
0.75 <f23T / f23W <1.00 (1)
0.01 <L23T / L23W <0.20 (2)
−15 <f1 / f23W <−8 (3)
The following conditional expression is satisfied. Here, conditional expression (3) uses the upper limit value of conditional expression (3a) described later
−15 <f1 / f23w, −8.2 (3x)
It is also good.

次に前述の各実施例の技術的意味について説明する。条件式（１）は広角端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の合成焦点距離に対する望遠端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の合成焦点距離との比を規定している。   Next, the technical meaning of each of the above-described embodiments will be described. Conditional expression (1) defines the ratio of the combined focal length of the second lens unit U2 and the third lens unit U3 at the telephoto end to the combined focal length of the second lens unit U2 and the third lens unit U3 at the wide angle end. Yes.

各実施例のズームレンズは物体側から像側へ順に、正，負，正，正の屈折力の第１レンズ群乃至第４レンズ群より構成される４群ズームレンズにおいて第２レンズ群を負の屈折力のレンズ群と正の屈折力のレンズ群の二つのレンズ群に分割している。そして物体側から像側へ順に、正，負，正，正，正の屈折力の第１レンズ群乃至第５レンズ群より構成される５群ズームレンズである。更に変倍の際に第２レンズ群Ｕ２と第３レンズ群Ｕ３をその合成パワーが広角端に比べて望遠端で短焦点化する（短くなる）ように移動させている。   The zoom lens according to each embodiment has a negative second lens group in a four-group zoom lens including first to fourth lens groups having positive, negative, positive, and positive refractive power in order from the object side to the image side. The lens unit is divided into two lens units, a lens unit having a refractive power of 1 and a lens unit having a positive refractive power. Then, in order from the object side to the image side, a five-unit zoom lens composed of first to fifth lens units having positive, negative, positive, positive, and positive refractive powers. Further, at the time of zooming, the second lens unit U2 and the third lens unit U3 are moved so that the combined power is shorter (shorter) at the telephoto end than at the wide-angle end.

このようにすることで、変倍レンズ群を強めたことによる変倍部の短縮効果と移動レンズ群が１つ増えたことによるズーミングに際しての収差変動を軽減し、高い光学性能を得つつ、高ズーム比化と全系の小型化を図っている。   By doing this, the shortening effect of the zooming unit due to the strengthening of the zooming lens unit and the aberration variation during zooming due to the addition of one moving lens unit are reduced, while obtaining high optical performance, The zoom ratio and the entire system are downsized.

条件式（１）の上限値を上回って広角端における合成焦点距離ｆ２３Ｗに対して望遠端における合成焦点距離ｆ２３Ｔが変わらない或いは長焦点化する（長くなる）とズーミングに際して第２レンズ群Ｕ２と第３レンズ群Ｕ３の移動量が増大する。そして、全系が大型化してくる。   If the combined focal length f23T at the telephoto end does not change or becomes longer (longer) than the combined focal length f23W at the wide-angle end exceeding the upper limit value of the conditional expression (1), the second lens unit U2 and the second lens unit U2 The amount of movement of the three lens unit U3 increases. And the whole system becomes larger.

条件式（１）の下限値を下回って広角端における合成焦点距離ｆ２３Ｗに対して望遠端における合成焦点距離ｆ２３Ｔが短くなると、変倍部の長さは短縮される。しかしながらズーミングに際して軸上色収差や倍率色収差、コマ収差等の諸収差の変動が大きくなり、全ズーム範囲にわたり、高い光学性能を得ることが困難となる。   When the combined focal length f23T at the telephoto end becomes shorter than the combined focal length f23W at the wide angle end below the lower limit value of the conditional expression (1), the length of the zooming unit is shortened. However, during zooming, variations in various aberrations such as axial chromatic aberration, lateral chromatic aberration, and coma aberration increase, making it difficult to obtain high optical performance over the entire zoom range.

条件式（２）は、広角端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔に対する望遠端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔の比を規定している。条件式（２）の上限値を上回って広角端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔Ｌ２３Ｗが望遠端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔Ｌ２３Ｔよりも小さくなると変倍部の長さが増大する。   Conditional expression (2) defines the ratio of the distance between the second lens group U2 and the third lens group U3 at the telephoto end to the distance between the second lens group U2 and the third lens group U3 at the wide angle end. If the upper limit of conditional expression (2) is exceeded and the distance L23W between the second lens group U2 and the third lens group U3 at the wide-angle end is smaller than the distance L23T between the second lens group U2 and the third lens group U3 at the telephoto end. The length of the zooming portion increases.

また、広角端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の合成焦点距離ｆ２３Ｗと望遠端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の合成焦点距離ｆ２３Ｔの変化が少なくなり、変倍部の長さを短縮するのが困難になる。また間隔変化が少なくても合成焦点距離の変化が十分ある場合は、第２レンズ群Ｕ２と第３レンズ群Ｕ３の屈折力が強いことを意味する。この場合、ズーミングによる収差変動を抑制するためには、第２レンズ群Ｕ２と、第３レンズ群Ｕ３の構成レンズ枚数を増大する必要があり、全系の小型化が困難になる。   Further, the change in the combined focal length f23W of the second lens unit U2 and the third lens unit U3 at the wide angle end and the combined focal length f23T of the second lens unit U2 and the third lens unit U3 at the telephoto end is reduced, and the zooming unit It becomes difficult to shorten the length. In addition, when there is a sufficient change in the combined focal length even if the interval change is small, it means that the refractive power of the second lens unit U2 and the third lens unit U3 is strong. In this case, in order to suppress aberration fluctuations due to zooming, it is necessary to increase the number of constituent lenses of the second lens unit U2 and the third lens unit U3, which makes it difficult to downsize the entire system.

条件式（２）の下限値を下回って、広角端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔Ｌ２３Ｗが望遠端における第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔Ｌ２３Ｔよりも長くなるとズーミングに際しての収差変動が増大してくる。又第２レンズ群Ｕ２の屈折力に対して第３レンズ群Ｕ３の屈折力が弱くなりすぎてしまい、ズーミングに伴う第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔変化に伴う収差変動を軽減するのが困難となる。   Below the lower limit of conditional expression (2), the distance L23W between the second lens group U2 and the third lens group U3 at the wide-angle end is longer than the distance L23T between the second lens group U2 and the third lens group U3 at the telephoto end. Then, aberration fluctuations during zooming increase. In addition, the refractive power of the third lens unit U3 becomes too weak with respect to the refractive power of the second lens unit U2, and the aberration variation due to the change in the distance between the second lens unit U2 and the third lens unit U3 due to zooming is reduced. It becomes difficult to do.

条件式（３）は、広角端における第２レンズ群Ｕ２と、第３レンズ群Ｕ３の合成焦点距離ｆ２３Ｗに対する第１レンズ群Ｕ１の焦点距離ｆ１の比を規定する。条件式（３）の下限値を下回って第２レンズ群Ｕ２と、第３レンズ群Ｕ３の負の合成屈折力の絶対値が大きくなると、ズーミングに伴う諸収差の変動が増大し、全ズーム範囲にわたり良好な光学性能を得ることが困難となる。   Conditional expression (3) defines the ratio of the focal length f1 of the first lens unit U1 to the combined focal length f23W of the second lens unit U2 and the third lens unit U3 at the wide-angle end. When the absolute value of the negative combined refractive power of the second lens unit U2 and the third lens unit U3 increases below the lower limit value of the conditional expression (3), fluctuations in various aberrations associated with zooming increase, and the entire zoom range. It is difficult to obtain good optical performance.

条件式（３）の上限値を上回って第２レンズ群Ｕ２と、第３レンズ群Ｕ３の負の合成屈折力の絶対値が小さくなると、変倍に必要な第２レンズ群Ｕ２と、第３レンズ群Ｕ３の移動量が増大してレンズ全長が長くなるため、全系の小型化が困難となる。更に好ましくは、条件式（１）乃至（３）の数値範囲を以下のごとく設定するのが良い。   When the absolute value of the negative combined refractive power of the second lens unit U2 and the third lens unit U3 becomes smaller than the upper limit value of the conditional expression (3), the second lens unit U2 necessary for zooming, and the third Since the movement amount of the lens unit U3 increases and the total lens length becomes longer, it is difficult to reduce the size of the entire system. More preferably, the numerical ranges of the conditional expressions (1) to (3) are set as follows.

０．８５＜ｆ２３Ｔ／ｆ２３Ｗ＜０．９７ ・・・（１ａ）
０．０２＜Ｌ２３Ｔ／Ｌ２３Ｗ＜０．１０ ・・・（２ａ）
−１２．０＜ｆ１／ｆ２３Ｗ＜−８．２ ・・・（３ａ）
以上のように本発明によれば、全系が小型でありながら広画角、高ズーム比でしかも全ズーム範囲にわたり高い光学性能を有するズームレンズが得られる。 0.85 <f23T / f23W <0.97 (1a)
0.02 <L23T / L23W <0.10 (2a)
−12.0 <f1 / f23W <−8.2 (3a)
As described above, according to the present invention, a zoom lens having a wide angle of view, a high zoom ratio, and high optical performance over the entire zoom range can be obtained while the entire system is small.

各実施例において、好ましくは以下の条件式のうち１以上を満足するのが良い。第２レンズ群Ｕ２の焦点距離をｆ２、第３レンズ群Ｕ３の焦点距離をｆ３とする。第３レンズ群Ｕ３は、負レンズと正レンズとを接合した接合レンズより構成される。そして正レンズの材料のｄ線におけるアッベ数をνｄｐ、屈折率をＮｄｐ、負レンズの材料のｄ線におけるアッベ数をνｄｎ、屈折率をＮｄｎとする。このとき、次の条件式のうち１以上を満足するのが良い。 In each embodiment, it is preferable to satisfy one or more of the following conditional expressions. The focal length of the second lens unit U2 is f2, and the focal length of the third lens unit U3 is f3. The third lens unit U3 includes a cemented lens in which a negative lens and a positive lens are cemented. The Abbe number at the d-line of the positive lens material is νdp, the refractive index is Ndp, the Abbe number at the d-line of the negative lens material is νdn, and the refractive index is Ndn. At this time, it is preferable to satisfy one or more of the following conditional expressions.

−０．２０＜ｆ２／ｆ３＜−０．０５ ・・・（４）
−０．３５＜Ｎｄｐ−Ｎｄｎ＜−０．１５ ・・・（５）
１５．０＜νｄｐ−νｄｎ＜３５．０ ・・・（６）
次に前述の各条件式の技術的意味について説明する。 −0.20 <f2 / f3 <−0.05 (4)
−0.35 <Ndp−Ndn <−0.15 (5)
15.0 <νdp−νdn <35.0 (6)
Next, the technical meaning of each conditional expression described above will be described.

条件式（４）は、第３レンズ群Ｕ３の焦点距離に対する第２レンズ群Ｕ２の焦点距離の比を規定している。条件式（４）の下限値を下回って第３レンズ群Ｕ３の正の屈折力が強くなりすぎると、ズーミングに際して収差変動が増大し、これを補正するため第３レンズ群Ｕ３の構成レンズ枚数を増加しなければならず、全系の小型化が困難になる。条件式（４）の上限値を上回って第３レンズ群Ｕ３の正の屈折力が弱くなりすぎると、変倍による第２レンズ群Ｕ２と第３レンズ群Ｕ３の間隔変化に伴う収差変動を補正するのが困難になる。そのため、全ズーム範囲にわたり、良好な光学性能を得ることが困難となる。   Conditional expression (4) defines the ratio of the focal length of the second lens unit U2 to the focal length of the third lens unit U3. If the positive refractive power of the third lens unit U3 becomes too strong below the lower limit value of the conditional expression (4), aberration variation increases during zooming, and the number of constituent lenses of the third lens unit U3 is set to correct this. It must be increased, making it difficult to downsize the entire system. If the positive refractive power of the third lens unit U3 becomes too weak beyond the upper limit value of the conditional expression (4), the aberration variation due to the change in the distance between the second lens unit U2 and the third lens unit U3 due to zooming is corrected. It becomes difficult to do. This makes it difficult to obtain good optical performance over the entire zoom range.

更に好ましくは、条件式（４）の数値範囲を以下のごとく設定するのが良い。
−０．１３＜ｆ２／ｆ３＜−０．０６ ・・・（４ａ）
条件式（５）と条件式（６）は、第３レンズ群Ｕ３が有する正レンズと負レンズの材料の屈折率とアッベ数を規定している。条件式（５）、条件式（６）の上限値、又は下限値を超えるとズーミングに際して球面収差の変動、軸上色収差の変動、そして倍率色収差の変動を軽減するのが困難となり、全ズーム範囲にわたり良好な光学性能を得るのが困難になる。 More preferably, the numerical range of conditional expression (4) is set as follows.
−0.13 <f2 / f3 <−0.06 (4a)
Conditional expression (5) and conditional expression (6) define the refractive index and Abbe number of the materials of the positive lens and negative lens of the third lens unit U3. If the upper limit value or lower limit value of conditional expression (5) or conditional expression (6) is exceeded, it will be difficult to reduce spherical aberration fluctuation, axial chromatic aberration fluctuation, and lateral chromatic aberration fluctuation during zooming. Therefore, it becomes difficult to obtain good optical performance.

更に好ましくは、条件式（５）、条件式（６）の数値範囲を以下のごとく設定するのが良い。   More preferably, the numerical ranges of conditional expression (5) and conditional expression (6) are set as follows.

−０．３＜Ｎｄｐ−Ｎｄｎ＜−０．２ ・・・（５ａ）
２０．０＜νｄｐ−νｄｎ＜３０．０ ・・・（６ａ）
各実施例に好ましくは次の構成をとるのが好ましい。 −0.3 <Ndp−Ndn <−0.2 (5a)
20.0 <νdp−νdn <30.0 (6a)
Each embodiment preferably has the following configuration.

広角端から望遠端へのズーミングに際して、第２レンズ群Ｕ２は像側へ移動し、第３レンズ群Ｕ３は像側に凸状の軌跡で移動し、第４レンズ群Ｕ４は物体側へ移動することである。第３レンズ群Ｕ３は負レンズと正レンズとを接合した接合レンズより構成されることである。第２レンズ群Ｕ２は物体側から像側へ順に、２つの負レンズ、正レンズ、負レンズより構成されることである。次に各実施例のズームレンズのレンズ構成について説明する。   During zooming from the wide-angle end to the telephoto end, the second lens unit U2 moves toward the image side, the third lens unit U3 moves along a locus convex toward the image side, and the fourth lens unit U4 moves toward the object side. That is. The third lens unit U3 is composed of a cemented lens in which a negative lens and a positive lens are cemented. The second lens unit U2 includes two negative lenses, a positive lens, and a negative lens in order from the object side to the image side. Next, the lens configuration of the zoom lens of each embodiment will be described.

［実施例１］
実施例１は、物体側から像側へ順に、正の屈折力の第１レンズ群Ｕ１、負の屈折力の第２レンズ群Ｕ２、正の屈折力の第３レンズ群Ｕ３、正の屈折力の第４レンズ群Ｕ４、正の屈折力の第５レンズ群Ｕ５より構成されている。第２レンズ群Ｕ２と第３レンズ群Ｕ３と第４レンズ群Ｕ４はズーミングに際して移動する変倍系を構成している。第３レンズ群Ｕ３は１つの負レンズと１つの正レンズとを接合した接合レンズより構成されている。 [Example 1]
In the first embodiment, in order from the object side to the image side, a first lens unit U1 having a positive refractive power, a second lens unit U2 having a negative refractive power, a third lens unit U3 having a positive refractive power, and a positive refractive power. The fourth lens unit U4 and the fifth lens unit U5 having a positive refractive power. The second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system that moves during zooming. The third lens unit U3 includes a cemented lens obtained by cementing one negative lens and one positive lens.

実施例１は前述の各条件式（１）乃至（６）を満たしている。これによって、広角端の撮影画角６３．２８°、ズーム比１２１．２７倍の広画角・高ズーム比で全ズーム範囲にわたり高い光学性能を有した小型のズームレンズを達成している。   The first embodiment satisfies the conditional expressions (1) to (6) described above. As a result, a compact zoom lens having high optical performance over the entire zoom range with a shooting angle of view of 63.28 ° at the wide angle end and a wide angle of view / high zoom ratio of 121.27 times has been achieved.

［実施例２］
実施例２において、レンズ群の数、各レンズ群の屈折力、ズーム軌跡等のズームタイプは実施例１と同じである。第３レンズ群Ｕ３のレンズ構成も実施例１と同じである。実施例２は前述の各条件式（１）乃至（６）を満たしている。これによって、広角端の撮影画角６３．２８°、ズーム比１１８．７７倍の広画角・高ズーム比で全ズーム範囲にわたり高い光学性能を有した小型のズームレンズを達成している。 [Example 2]
In the second embodiment, the zoom type such as the number of lens groups, the refractive power of each lens group, and the zoom locus is the same as that in the first embodiment. The lens configuration of the third lens unit U3 is the same as that of the first embodiment. The second embodiment satisfies the conditional expressions (1) to (6) described above. As a result, a compact zoom lens having high optical performance over the entire zoom range with a shooting angle of view of 63.28 ° at the wide-angle end and a wide angle of view / high zoom ratio of 118.77 times the zoom ratio is achieved.

以上、各実施例によれば広画角化と高ズーム比化を図りつつ、レンズ系全体の小型化及び軽量化を図ったズームレンズが得られる。特に各実施例によれば、広画角の撮影画角５０度以上、ズーム比６０以上の高ズーム比で、しかも全ズーム範囲にわたり高い光学性能を有するズームレンズが得られる。   As described above, according to each embodiment, it is possible to obtain a zoom lens in which the entire lens system is reduced in size and weight while achieving a wide angle of view and a high zoom ratio. In particular, according to each embodiment, it is possible to obtain a zoom lens having a wide field angle shooting angle of view of 50 ° or more, a high zoom ratio of 60 or more, and high optical performance over the entire zoom range.

以上、本発明の好ましい実施形態について説明したが、本発明はこれらの実施形態に限定されず、その要旨の範囲内で種々の変形及び変更が可能である。   As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

図５は本発明の各実施例のズームレンズを撮影光学系として用いた撮像装置（テレビカメラシステム）の要部概略図である。図５において１０１は実施例１又は２のズームレンズである。２０１はカメラである。ズームレンズ１０１はカメラ２０１に対して着脱可能となっている。３０１はカメラ２０１にズームレンズ１０１を装着することで構成される撮像装置である。ズームレンズ１０１はフォーカス用のレンズ系を含むフォーカス部Ｆ、変倍用のレンズ群を含む変倍部Ｖ、変倍に伴う像面変動を補正するレンズ群やフォーカシングに際して不動の結像用のレンズ群を含むレンズ部ＣＲを有している。   FIG. 5 is a schematic diagram of a main part of an image pickup apparatus (television camera system) using the zoom lens of each embodiment of the present invention as a photographing optical system. In FIG. 5, reference numeral 101 denotes the zoom lens of the first or second embodiment. Reference numeral 201 denotes a camera. The zoom lens 101 can be attached to and detached from the camera 201. Reference numeral 301 denotes an imaging apparatus configured by mounting the zoom lens 101 on the camera 201. The zoom lens 101 includes a focusing unit F including a focusing lens system, a zooming unit V including a zooming lens group, a lens group that corrects image plane variation accompanying zooming, and an imaging lens that does not move during focusing. It has a lens portion CR including a group.

リレー部ＣＲには、ズームレンズ全系の焦点距離を変位させる、光路中より挿抜可能なレンズユニット（エクステンダー）が含まれていても良い。また、リレー部ＣＲには、像ぶれ補正に際して光軸に対して垂直方向の成分を持つように移動する防振光学系が含まれていても良い。ＳＰは開口絞りである。１０２乃至１０４は各々フォーカス部Ｆ、変倍部Ｖ、リレー部ＣＲに含まれている各レンズ群を駆動するヘリコイドやカム等の駆動機構である。   The relay unit CR may include a lens unit (extender) that can be inserted into and removed from the optical path that displaces the focal length of the entire zoom lens system. In addition, the relay unit CR may include an anti-vibration optical system that moves so as to have a component in a direction perpendicular to the optical axis during image blur correction. SP is an aperture stop. Reference numerals 102 to 104 denote drive mechanisms such as helicoids and cams for driving the lens groups included in the focus unit F, the zoom unit V, and the relay unit CR, respectively.

ここで、１０５乃至１０８は駆動機構１０２乃至１０４および開口絞りＳＰを電動駆動するモータ（駆動手段）である。１０９乃至１１２は、フォーカス部Ｆや変倍部Ｖ、そしてリレー部ＣＲにふくまれている各レンズ群の光軸上の位置や、開口絞りＳＰの絞り径等を検出するためのエンコーダやポテンショメータ、あるいはフォトセンサ等の検出器である。   Here, 105 to 108 are motors (drive means) for electrically driving the drive mechanisms 102 to 104 and the aperture stop SP. Reference numerals 109 to 112 denote an encoder and a potentiometer for detecting the position on the optical axis of each lens group included in the focus unit F, the zoom unit V, and the relay unit CR, the aperture diameter of the aperture stop SP, and the like. Alternatively, it is a detector such as a photosensor.

カメラ２０１において、２０２は光学フィルタや色分解光学系に相当するガラスブロック、２０３はズームレンズ１０１によって形成された被写体像を受光するＣＣＤセンサやＣＭＯＳセンサ等の固体撮像素子（光電変換素子）である。また、２０４、１１３はカメラ２０１及びズームレンズ１０１の各種の駆動を制御するＣＰＵである。   In the camera 201, 202 is a glass block corresponding to an optical filter or a color separation optical system, and 203 is a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the zoom lens 101. . Reference numerals 204 and 113 denote CPUs that control various types of driving of the camera 201 and the zoom lens 101.

このように、本発明のズームレンズをテレビカメラに適用することにより、高い光学性能を有する撮像装置を実現している。本発明に関するズームレンズおよびカメラの構成は図５の形態に限定されず、その要旨の範囲内で種々の変形及び変更が可能である。この他、本発明のズームレンズはデジタルカメラやビデオカメラ等の撮像装置にも適用することができる。   In this way, an imaging apparatus having high optical performance is realized by applying the zoom lens of the present invention to a television camera. The configurations of the zoom lens and the camera according to the present invention are not limited to the form shown in FIG. 5, and various modifications and changes can be made within the scope of the gist. In addition, the zoom lens of the present invention can be applied to an imaging apparatus such as a digital camera or a video camera.

以下に本発明の数値実施例を示す。各数値実施例においていずれも、ｉは物体側からの面の順序を示す。ｒｉは物体側より第ｉ番目の面の曲率半径、ｄｉは物体側より第ｉ番目と第ｉ＋１番目の間隔、ｎｄｉ、νｄｉは第ｉ番目の光学部材のｄ線の屈折率とアッベ数である。ＢＦは空気換算のバックフォーカスであり、最終レンズ面から像面までの空気換算距離として示している。レンズ全長は第１レンズ面から最終レンズ面までの距離にバックフォーカスを加えた値である。   Numerical examples of the present invention are shown below. In each numerical example, i indicates the order of the surfaces from the object side. ri is the radius of curvature of the i-th surface from the object side, di is the i-th and i + 1-th distance from the object side, and ndi and νdi are the refractive index and Abbe number of the d-line of the i-th optical member. . BF is an air equivalent back focus, and is shown as an air equivalent distance from the final lens surface to the image plane. The total lens length is a value obtained by adding back focus to the distance from the first lens surface to the final lens surface.

非球面形状は光軸方向にＸ軸、光軸と垂直方向にＨ軸、光の進行方向を正とする。Ｒを近軸曲率半径、ｋを円錐常数、Ａ４、Ａ６、Ａ８、Ａ１０、Ａ１２、Ａ１４、Ａ１６、Ａ３、Ａ５、Ａ７、Ａ９、Ａ１１、Ａ１３、Ａ１５をそれぞれ非球面係数としたとき、次式で表している。また、「ｅ−Ｚ」は「×１０−Ｚ」を意味する。また、各実施例と前述した各条件式との対応を表１に示す。 In the aspherical shape, the X axis is in the optical axis direction, the H axis is perpendicular to the optical axis, and the light traveling direction is positive. When R is a paraxial radius of curvature, k is a cone constant, and A4, A6, A8, A10, A12, A14, A16, A3, A5, A7, A9, A11, A13, and A15 are aspheric coefficients, respectively, It is represented by “E-Z” means “× 10 −Z ”. Table 1 shows the correspondence between each example and each conditional expression described above.

＜数値実施例１＞
単位 mm

面データ
面番号 r d nd νd 有効径
1 3168.004 8.99 1.43387 95.1 208.87
2 -3408.697 0.51 206.13
3 2907.145 6.00 1.83400 37.2 203.27
4 334.947 6.24 199.00
5 346.667 24.54 1.43387 95.1 201.65
6 -995.715 26.38 202.11
7 386.610 17.79 1.43387 95.1 204.80
8 -4418.939 0.25 204.45
9 266.188 19.88 1.43387 95.1 200.27
10 2123.528 1.20 199.25
11 188.122 16.65 1.43387 95.1 180.50
12 461.635 (可変) 178.50
13* 1439.182 2.20 2.00330 28.3 40.92
14 34.560 7.70 35.27
15 -87.402 1.60 1.83400 37.2 34.69
16 35.535 7.83 1.95906 17.5 34.08
17 -109.618 2.31 34.04
18 -43.972 2.00 1.88300 40.8 34.07
19 -540.377 (可変) 36.42
20 1315.023 2.00 1.83400 37.2 58.76
21 256.405 6.45 1.60311 60.6 60.18
22 -148.837 (可変) 60.97
23 135.158 13.76 1.60311 60.6 80.20
24* -158.578 0.20 80.51
25 101.928 10.52 1.59349 67.0 79.40
26 1415.975 0.20 78.30
27 224.350 2.50 1.84666 23.8 76.66
28 66.400 18.94 1.43875 94.9 72.14
29 -180.211 0.20 71.01
30 515.787 3.96 1.60311 60.6 68.36
31* -446.857 (可変) 67.61
32(絞り) ∞ 4.94 36.62
33 -158.458 1.40 1.88300 40.8 32.90
34 48.857 1.01 32.00
35 35.536 6.30 1.80809 22.8 32.30
36 178.535 2.71 31.70
37 -155.054 1.40 1.81600 46.6 30.50
38 503.128 7.49 30.10
39 -53.176 1.50 1.72916 54.7 29.55
40 173.063 7.44 1.80518 25.4 29.92
41 -65.671 5.04 30.29
42 -29.956 2.00 1.78590 44.2 29.55
43 323.934 8.75 1.53172 48.8 31.77
44 -27.556 3.01 33.01
45 -544.652 2.55 1.48749 70.2 32.16
46 -131.767 1.91 32.07
47 -146.590 1.50 1.88300 40.8 31.68
48 38.568 8.40 1.51823 58.9 31.68
49 -56.313 0.21 32.27
50 103.296 7.81 1.43875 94.9 32.41
51 -29.586 1.50 1.83400 37.2 32.28
52 -67.620 0.20 33.21
53 137.053 8.43 1.51633 64.1 33.15
54 -46.002 10.00 32.73
55 ∞ 33.00 1.60859 46.4 60.00
56 ∞ 13.20 1.51633 64.2 60.00
57 ∞ 13.85 60.00
像面 ∞
<Numerical Example 1>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 3168.004 8.99 1.43387 95.1 208.87
2 -3408.697 0.51 206.13
3 2907.145 6.00 1.83400 37.2 203.27
4 334.947 6.24 199.00
5 346.667 24.54 1.43387 95.1 201.65
6 -995.715 26.38 202.11
7 386.610 17.79 1.43387 95.1 204.80
8 -4418.939 0.25 204.45
9 266.188 19.88 1.43387 95.1 200.27
10 2123.528 1.20 199.25
11 188.122 16.65 1.43387 95.1 180.50
12 461.635 (variable) 178.50
13 * 1439.182 2.20 2.00330 28.3 40.92
14 34.560 7.70 35.27
15 -87.402 1.60 1.83400 37.2 34.69
16 35.535 7.83 1.95906 17.5 34.08
17 -109.618 2.31 34.04
18 -43.972 2.00 1.88300 40.8 34.07
19 -540.377 (variable) 36.42
20 1315.023 2.00 1.83400 37.2 58.76
21 256.405 6.45 1.60311 60.6 60.18
22 -148.837 (variable) 60.97
23 135.158 13.76 1.60311 60.6 80.20
24 * -158.578 0.20 80.51
25 101.928 10.52 1.59349 67.0 79.40
26 1415.975 0.20 78.30
27 224.350 2.50 1.84666 23.8 76.66
28 66.400 18.94 1.43875 94.9 72.14
29 -180.211 0.20 71.01
30 515.787 3.96 1.60311 60.6 68.36
31 * -446.857 (variable) 67.61
32 (Aperture) ∞ 4.94 36.62
33 -158.458 1.40 1.88300 40.8 32.90
34 48.857 1.01 32.00
35 35.536 6.30 1.80809 22.8 32.30
36 178.535 2.71 31.70
37 -155.054 1.40 1.81600 46.6 30.50
38 503.128 7.49 30.10
39 -53.176 1.50 1.72916 54.7 29.55
40 173.063 7.44 1.80518 25.4 29.92
41 -65.671 5.04 30.29
42 -29.956 2.00 1.78590 44.2 29.55
43 323.934 8.75 1.53172 48.8 31.77
44 -27.556 3.01 33.01
45 -544.652 2.55 1.48749 70.2 32.16
46 -131.767 1.91 32.07
47 -146.590 1.50 1.88300 40.8 31.68
48 38.568 8.40 1.51823 58.9 31.68
49 -56.313 0.21 32.27
50 103.296 7.81 1.43875 94.9 32.41
51 -29.586 1.50 1.83400 37.2 32.28
52 -67.620 0.20 33.21
53 137.053 8.43 1.51633 64.1 33.15
54 -46.002 10.00 32.73
55 ∞ 33.00 1.60859 46.4 60.00
56 ∞ 13.20 1.51633 64.2 60.00
57 ∞ 13.85 60.00
Image plane ∞

非球面データ
第13面
K = 2.54787e+003 A 4= 8.84145e-007 A 6=-2.45801e-010
A 8=-1.04969e-012 A10=-1.69692e-014 A12= 5.99603e-017
A14=-1.39609e-018 A16=-7.51498e-022
A 3=-3.66160e-007 A 5=-9.39271e-009 A 7= 4.36582e-011
A 9=-1.50692e-014 A11= 3.57828e-016 A13= 9.32016e-018
A15= 5.67905e-020

第24面
K = 4.06468e-001 A 4= 2.66368e-007 A 6=-9.01072e-012
A 8=-3.98883e-014 A10=-5.42983e-018 A12=-1.25518e-020
A14= 9.75716e-024 A16= 5.58915e-027
A 3= 3.61223e-007 A 5= 8.99220e-011 A 7= 6.31016e-013
A 9= 5.86319e-016 A11= 3.49281e-019 A13= 3.16943e-022
A15=-5.44557e-025

第31面
K = 1.03572e+002 A 4= 4.67723e-007 A 6=-1.19732e-010
A 8= 3.89145e-014 A10= 1.09245e-016 A12= 7.31259e-020
A14=-5.43815e-023 A16=-2.35475e-026
A 3=-8.75039e-007 A 5=-5.83900e-011 A 7= 5.75306e-012
A 9= 4.65227e-016 A11=-8.69077e-018 A13= 1.46126e-021
A15= 2.31859e-024
Aspherical data 13th surface
K = 2.54787e + 003 A 4 = 8.84145e-007 A 6 = -2.45801e-010
A 8 = -1.04969e-012 A10 = -1.69692e-014 A12 = 5.99603e-017
A14 = -1.39609e-018 A16 = -7.51498e-022
A 3 = -3.66160e-007 A 5 = -9.39271e-009 A 7 = 4.36582e-011
A 9 = -1.50692e-014 A11 = 3.57828e-016 A13 = 9.32016e-018
A15 = 5.67905e-020

24th page
K = 4.06468e-001 A 4 = 2.66368e-007 A 6 = -9.01072e-012
A 8 = -3.98883e-014 A10 = -5.42983e-018 A12 = -1.25518e-020
A14 = 9.75716e-024 A16 = 5.58915e-027
A 3 = 3.61223e-007 A 5 = 8.99220e-011 A 7 = 6.31016e-013
A 9 = 5.86319e-016 A11 = 3.49281e-019 A13 = 3.16943e-022
A15 = -5.44557e-025

No. 31
K = 1.03572e + 002 A 4 = 4.67723e-007 A 6 = -1.19732e-010
A 8 = 3.89145e-014 A10 = 1.09245e-016 A12 = 7.31259e-020
A14 = -5.43815e-023 A16 = -2.35475e-026
A 3 = -8.75039e-007 A 5 = -5.83900e-011 A 7 = 5.75306e-012
A 9 = 4.65227e-016 A11 = -8.69077e-018 A13 = 1.46126e-021
A15 = 2.31859e-024

各種データ
ズーム比 121.27

焦点距離 8.93 67.59 290.59 1082.60
Fナンバー 1.82 1.81 1.82 5.63
半画角 31.64 4.65 1.08 0.29
像高 5.50 5.50 5.50 5.50
レンズ全長 632.32 632.32 632.32 632.32
BF 53.07 53.07 53.07 53.07

d12 2.86 148.43 187.72 202.28
d19 24.69 33.14 25.64 0.87
d22 252.38 79.15 24.20 0.65
d31 3.00 22.21 45.39 79.15

入射瞳位置 136.13 853.54 2741.92 13396.08
射出瞳位置 364.70 364.70 364.70 364.70
前側主点位置 145.29 934.14 3273.19 17819.14
後側主点位置 4.92 -53.74 -276.74 -1068.75

ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 258.47 128.43 75.89 -20.59
2 13 -20.00 23.64 5.18 -10.09
3 20 263.39 8.45 5.21 0.11
4 23 67.50 50.29 12.19 -23.17
5 32 54.25 141.70 64.44 21.51
Various data Zoom ratio 121.27

Focal length 8.93 67.59 290.59 1082.60
F number 1.82 1.81 1.82 5.63
Half angle of view 31.64 4.65 1.08 0.29
Image height 5.50 5.50 5.50 5.50
Total lens length 632.32 632.32 632.32 632.32
BF 53.07 53.07 53.07 53.07

d12 2.86 148.43 187.72 202.28
d19 24.69 33.14 25.64 0.87
d22 252.38 79.15 24.20 0.65
d31 3.00 22.21 45.39 79.15

Entrance pupil position 136.13 853.54 2741.92 13396.08
Exit pupil position 364.70 364.70 364.70 364.70
Front principal point 145.29 934.14 3273.19 17819.14
Rear principal point position 4.92 -53.74 -276.74 -1068.75

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 258.47 128.43 75.89 -20.59
2 13 -20.00 23.64 5.18 -10.09
3 20 263.39 8.45 5.21 0.11
4 23 67.50 50.29 12.19 -23.17
5 32 54.25 141.70 64.44 21.51

単レンズデータ
レンズ 始面 焦点距離
1 1 3776.56
2 3 -451.51
3 5 594.48
4 7 818.25
5 9 697.43
6 11 716.75
7 13 -35.03
8 15 -29.92
9 16 28.37
10 18 -54.00
11 20 -379.81
12 21 156.47
13 23 122.68
14 25 183.86
15 27 -111.11
16 28 112.96
17 30 396.05
18 33 -41.91
19 35 53.29
20 37 -144.38
21 39 -55.39
22 40 59.41
23 42 -34.62
24 43 47.95
25 45 354.63
26 47 -34.25
27 48 45.37
28 50 53.24
29 51 -63.82
30 53 67.52
31 55 0.00
32 56 0.00
Single lens Data lens Start surface Focal length
1 1 3776.56
2 3 -451.51
3 5 594.48
4 7 818.25
5 9 697.43
6 11 716.75
7 13 -35.03
8 15 -29.92
9 16 28.37
10 18 -54.00
11 20 -379.81
12 21 156.47
13 23 122.68
14 25 183.86
15 27 -111.11
16 28 112.96
17 30 396.05
18 33 -41.91
19 35 53.29
20 37 -144.38
21 39 -55.39
22 40 59.41
23 42 -34.62
24 43 47.95
25 45 354.63
26 47 -34.25
27 48 45.37
28 50 53.24
29 51 -63.82
30 53 67.52
31 55 0.00
32 56 0.00

＜数値実施例２＞
単位 mm

面データ
面番号 r d nd νd 有効径
1 2347.502 6.91 1.49700 81.5 209.09
2 -2953.443 0.34 207.78
3 4984.865 6.00 1.83400 37.2 205.26
4 335.915 8.35 198.22
5 364.292 23.24 1.43387 95.1 198.12
6 -858.241 26.14 198.53
7 372.012 15.38 1.43387 95.1 201.09
8 4005.455 0.25 200.73
9 277.894 20.70 1.43387 95.1 197.88
10 24796.970 1.20 196.96
11 188.122 16.78 1.43387 95.1 180.50
12 468.104 (可変) 178.50
13* 2493.335 2.20 2.00330 28.3 43.23
14 36.481 7.46 37.29
15 -117.771 1.60 1.88300 40.8 36.82
16 36.862 7.77 1.95906 17.5 35.94
17 -115.064 2.74 35.68
18 -42.757 2.00 1.83400 37.2 35.50
19 -24354.050 (可変) 37.74
20 218.752 2.00 1.77250 49.6 45.34
21 168.661 4.86 1.48749 70.2 46.29
22 -126.043 (可変) 46.86
23 154.435 13.52 1.49700 81.5 82.71
24* -149.496 0.20 83.24
25 112.501 12.54 1.59349 67.0 84.21
26 -476.585 0.20 83.57
27 113.547 2.50 1.84666 23.8 78.80
28 56.842 17.12 1.43875 94.9 73.30
29 -2933.457 0.20 72.05
30 684.016 3.99 1.60311 60.6 71.32
31* -392.231 (可変) 70.66
32(絞り) ∞ 4.94 37.18
33 -169.578 1.40 1.88300 40.8 32.90
34 51.420 2.13 32.00
35 35.297 5.32 1.80809 22.8 32.30
36 167.107 2.79 31.70
37 -148.702 1.40 1.81600 46.6 30.50
38 320.593 8.35 30.10
39 -53.036 1.50 1.72916 54.7 30.23
40 336.051 6.16 1.80518 25.4 30.61
41 -66.811 5.14 30.95
42 -30.011 2.00 1.78590 44.2 30.28
43 331.193 8.96 1.53172 48.8 32.72
44 -27.504 3.28 33.95
45 4472.706 3.83 1.54814 45.8 33.11
46 -104.686 1.60 32.95
47 -145.671 1.50 1.88300 40.8 32.39
48 38.178 8.30 1.51823 58.9 32.16
49 -57.701 0.21 32.59
50 111.001 7.67 1.43875 94.9 32.48
51 -29.521 1.50 1.83400 37.2 32.30
52 -80.807 0.20 33.19
53 120.220 6.20 1.51633 64.1 33.20
54 -46.002 10.00 33.02
55 ∞ 33.00 1.60859 46.4 60.00
56 ∞ 13.20 1.51633 64.2 60.00
57 ∞ 14.40 60.00
像面 ∞
<Numerical Example 2>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 2347.502 6.91 1.49700 81.5 209.09
2 -2953.443 0.34 207.78
3 4984.865 6.00 1.83400 37.2 205.26
4 335.915 8.35 198.22
5 364.292 23.24 1.43387 95.1 198.12
6 -858.241 26.14 198.53
7 372.012 15.38 1.43387 95.1 201.09
8 4005.455 0.25 200.73
9 277.894 20.70 1.43387 95.1 197.88
10 24796.970 1.20 196.96
11 188.122 16.78 1.43387 95.1 180.50
12 468.104 (variable) 178.50
13 * 2493.335 2.20 2.00330 28.3 43.23
14 36.481 7.46 37.29
15 -117.771 1.60 1.88300 40.8 36.82
16 36.862 7.77 1.95906 17.5 35.94
17 -115.064 2.74 35.68
18 -42.757 2.00 1.83400 37.2 35.50
19 -24354.050 (variable) 37.74
20 218.752 2.00 1.77250 49.6 45.34
21 168.661 4.86 1.48749 70.2 46.29
22 -126.043 (variable) 46.86
23 154.435 13.52 1.49700 81.5 82.71
24 * -149.496 0.20 83.24
25 112.501 12.54 1.59349 67.0 84.21
26 -476.585 0.20 83.57
27 113.547 2.50 1.84666 23.8 78.80
28 56.842 17.12 1.43875 94.9 73.30
29 -2933.457 0.20 72.05
30 684.016 3.99 1.60311 60.6 71.32
31 * -392.231 (variable) 70.66
32 (Aperture) ∞ 4.94 37.18
33 -169.578 1.40 1.88300 40.8 32.90
34 51.420 2.13 32.00
35 35.297 5.32 1.80809 22.8 32.30
36 167.107 2.79 31.70
37 -148.702 1.40 1.81600 46.6 30.50
38 320.593 8.35 30.10
39 -53.036 1.50 1.72916 54.7 30.23
40 336.051 6.16 1.80518 25.4 30.61
41 -66.811 5.14 30.95
42 -30.011 2.00 1.78590 44.2 30.28
43 331.193 8.96 1.53172 48.8 32.72
44 -27.504 3.28 33.95
45 4472.706 3.83 1.54814 45.8 33.11
46 -104.686 1.60 32.95
47 -145.671 1.50 1.88300 40.8 32.39
48 38.178 8.30 1.51823 58.9 32.16
49 -57.701 0.21 32.59
50 111.001 7.67 1.43875 94.9 32.48
51 -29.521 1.50 1.83400 37.2 32.30
52 -80.807 0.20 33.19
53 120.220 6.20 1.51633 64.1 33.20
54 -46.002 10.00 33.02
55 ∞ 33.00 1.60859 46.4 60.00
56 ∞ 13.20 1.51633 64.2 60.00
57 ∞ 14.40 60.00
Image plane ∞

非球面データ
第13面
K = 1.27941e+003 A 4= 9.76888e-007 A 6=-2.38967e-010
A 8=-4.79914e-013 A10=-1.95218e-014 A12= 6.30786e-017
A14=-1.40715e-018 A16=-7.22787e-022
A 3=-6.52813e-007 A 5=-1.12519e-008 A 7= 5.45235e-011
A 9=-6.04665e-014 A11= 4.71715e-016 A13= 9.65348e-018
A15= 5.57939e-020

第24面
K = 7.32651e-001 A 4= 2.73115e-007 A 6=-1.62942e-011
A 8=-3.79858e-014 A10=-5.05733e-018 A12=-1.22190e-020
A14= 1.05063e-023 A16= 6.20732e-027
A 3=-5.04724e-008 A 5=-1.00662e-010 A 7= 9.17215e-013
A 9= 4.95528e-016 A11= 3.48769e-019 A13= 3.44167e-022
A15=-6.00619e-025

第31面
K = 8.00630e+001 A 4= 3.91100e-007 A 6=-8.16312e-011
A 8= 5.49641e-014 A10= 8.35170e-017 A12= 8.32681e-020
A14=-4.94472e-023 A16=-3.14699e-026
A 3=-5.20761e-007 A 5=-7.02158e-010 A 7= 5.61679e-012
A 9=-3.89245e-016 A11=-8.18056e-018 A13= 1.73383e-021
A15= 2.24057e-024
Aspherical data 13th surface
K = 1.27941e + 003 A 4 = 9.76888e-007 A 6 = -2.38967e-010
A 8 = -4.79914e-013 A10 = -1.95218e-014 A12 = 6.30786e-017
A14 = -1.40715e-018 A16 = -7.22787e-022
A 3 = -6.52813e-007 A 5 = -1.12519e-008 A 7 = 5.45235e-011
A 9 = -6.04665e-014 A11 = 4.71715e-016 A13 = 9.65348e-018
A15 = 5.57939e-020

24th page
K = 7.32651e-001 A 4 = 2.73115e-007 A 6 = -1.62942e-011
A 8 = -3.79858e-014 A10 = -5.05733e-018 A12 = -1.22190e-020
A14 = 1.05063e-023 A16 = 6.20732e-027
A 3 = -5.04724e-008 A 5 = -1.00662e-010 A 7 = 9.17215e-013
A 9 = 4.95528e-016 A11 = 3.48769e-019 A13 = 3.44167e-022
A15 = -6.00619e-025

No. 31
K = 8.00630e + 001 A 4 = 3.91100e-007 A 6 = -8.16312e-011
A 8 = 5.49641e-014 A10 = 8.35170e-017 A12 = 8.32681e-020
A14 = -4.94472e-023 A16 = -3.14699e-026
A 3 = -5.20761e-007 A 5 = -7.02158e-010 A 7 = 5.61679e-012
A 9 = -3.89245e-016 A11 = -8.18056e-018 A13 = 1.73383e-021
A15 = 2.24057e-024

各種データ
ズーム比 118.77

焦点距離 8.93 66.36 282.89 1060.29
Fナンバー 1.87 1.86 1.87 5.55
半画角 31.64 4.74 1.11 0.30
像高 5.50 5.50 5.50 5.50
レンズ全長 635.53 635.53 635.53 635.53
BF 53.62 53.62 53.62 53.62

d12 2.87 146.96 185.84 200.25
d19 7.72 11.49 6.76 0.70
d22 278.45 110.78 50.36 0.17
d31 2.30 22.10 48.38 90.22

入射瞳位置 135.31 830.05 2564.20 12530.52
射出瞳位置 444.51 444.51 444.51 444.51
前側主点位置 144.42 906.65 3033.16 16204.61
後側主点位置 5.47 -51.96 -268.49 -1045.89

ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 258.47 125.30 75.06 -19.15
2 13 -20.00 23.77 5.62 -9.62
3 20 175.59 6.86 2.66 -1.76
4 23 67.50 50.27 11.66 -23.12
5 32 56.84 140.59 65.69 22.78
Various data Zoom ratio 118.77

Focal length 8.93 66.36 282.89 1060.29
F number 1.87 1.86 1.87 5.55
Half angle of view 31.64 4.74 1.11 0.30
Image height 5.50 5.50 5.50 5.50
Total lens length 635.53 635.53 635.53 635.53
BF 53.62 53.62 53.62 53.62

d12 2.87 146.96 185.84 200.25
d19 7.72 11.49 6.76 0.70
d22 278.45 110.78 50.36 0.17
d31 2.30 22.10 48.38 90.22

Entrance pupil position 135.31 830.05 2564.20 12530.52
Exit pupil position 444.51 444.51 444.51 444.51
Front principal point position 144.42 906.65 3033.16 16204.61
Rear principal point position 5.47 -51.96 -268.49 -1045.89

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 258.47 125.30 75.06 -19.15
2 13 -20.00 23.77 5.62 -9.62
3 20 175.59 6.86 2.66 -1.76
4 23 67.50 50.27 11.66 -23.12
5 32 56.84 140.59 65.69 22.78

単レンズデータ
レンズ 始面 焦点距離
1 1 2625.09
2 3 -429.39
3 5 591.37
4 7 941.64
5 9 645.97
6 11 710.21
7 13 -36.61
8 15 -31.46
9 16 29.47
10 18 -51.03
11 20 -965.76
12 21 148.27
13 23 154.69
14 25 154.04
15 27 -135.88
16 28 126.99
17 30 412.29
18 33 -44.29
19 35 53.83
20 37 -123.69
21 39 -62.45
22 40 69.05
23 42 -34.74
24 43 47.95
25 45 185.71
26 47 -33.93
27 48 45.51
28 50 53.91
29 51 -56.17
30 53 65.03
31 55 0.00
32 56 0.00

Single lens Data lens Start surface Focal length
1 1 2625.09
2 3 -429.39
3 5 591.37
4 7 941.64
5 9 645.97
6 11 710.21
7 13 -36.61
8 15 -31.46
9 16 29.47
10 18 -51.03
11 20 -965.76
12 21 148.27
13 23 154.69
14 25 154.04
15 27 -135.88
16 28 126.99
17 30 412.29
18 33 -44.29
19 35 53.83
20 37 -123.69
21 39 -62.45
22 40 69.05
23 42 -34.74
24 43 47.95
25 45 185.71
26 47 -33.93
27 48 45.51
28 50 53.91
29 51 -56.17
30 53 65.03
31 55 0.00
32 56 0.00

Ｕ１：第１レンズ群 Ｕ２：第２レンズ群 Ｕ３：第３レンズ群
Ｕ４：第４レンズ群 Ｕ５：第５レンズ群 ＳＰ：絞り U1: First lens group U2: Second lens group U3: Third lens group U4: Fourth lens group U5: Fifth lens group SP: Aperture

Claims (7)

物体側から像側へ順に、ズーミングのためには不動の正の屈折力の第１レンズ群、ズーミングのために移動する負の屈折力の第２レンズ群、ズーミングのために移動する正の屈折力の第３レンズ群、ズーミングのために移動する正の屈折力の第４レンズ群、ズーミングのためには不動の正の屈折力の第５レンズ群より構成されるズームレンズであって、
前記第３レンズ群は、負レンズと正レンズとを接合してなる接合レンズより構成され、
広角端における前記第２レンズ群と前記第３レンズ群との間隔をＬ２３Ｗとし、望遠端における前記第２レンズ群と前記第３レンズ群との間隔をＬ２３Ｔとし、広角端における前記第２レンズ群と前記第３レンズ群との合成焦点距離をｆ２３Ｗとし、望遠端における前記第２レンズ群と前記第３レンズ群との合成焦点距離をｆ２３Ｔとし、前記第１レンズ群の焦点距離をｆ１とし、前記正レンズの材料のｄ線におけるアッベ数をνｄｐとし、前記負レンズの材料のｄ線におけるアッベ数をνｄｎとして、
０．７５＜ｆ２３Ｔ／ｆ２３Ｗ＜１．００
０．０１＜Ｌ２３Ｔ／Ｌ２３Ｗ＜０．２０
−１５＜ｆ１／ｆ２３Ｗ＜−８
２０．０＜νｄｐ−νｄｎ＜３０．０
なる条件式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, a first lens unit having a positive refractive power that does not move for zooming, a second lens unit having a negative refractive power that moves for zooming , and a positive refraction that moves for zooming. the third lens group of the force, a positive fourth lens group having a refractive power, the zoom lens composed of a fifth lens unit having a positive refractive power and does not move for zooming to move for zooming,
The third lens group includes a cemented lens formed by cementing a negative lens and a positive lens,
The distance between the third lens group and the second lens group at the wide-angle end and L23w, the distance between the third lens group and the second lens group at the telephoto end and L23T, said at the wide angle end the second lens group wherein the composite focal length of the third lens group and F23W, a composite focal length of the second lens group at the telephoto end and the third lens group and F23T, the focal length of the first lens group is f1 and The Abbe number at the d-line of the material of the positive lens is νdp, and the Abbe number at the d-line of the material of the negative lens is νdn,
0.75 <f23T / f23W <1.00
0.01 <L23T / L23W <0.20
−15 <f1 / f23W <−8
20.0 <νdp−νdn <30.0
A zoom lens satisfying the following conditional expression: 物体側から像側へ順に、ズーミングのためには不動の正の屈折力の第１レンズ群、ズーミングのために移動する負の屈折力の第２レンズ群、ズーミングのために移動する正の屈折力の第３レンズ群、ズーミングのために移動する正の屈折力の第４レンズ群、ズーミングのためには不動の正の屈折力の第５レンズ群より構成されるズームレンズであって、  In order from the object side to the image side, a first lens unit having a positive refractive power that does not move for zooming, a second lens unit having a negative refractive power that moves for zooming, and a positive refraction that moves for zooming. A zoom lens composed of a third lens group of power, a fourth lens group of positive refractive power that moves for zooming, and a fifth lens group of positive refractive power that does not move for zooming,
前記第３レンズ群は、負レンズと正レンズとを接合してなる接合レンズより構成され、  The third lens group includes a cemented lens formed by cementing a negative lens and a positive lens,
広角端における前記第２レンズ群と前記第３レンズ群との間隔をＬ２３Ｗとし、望遠端における前記第２レンズ群と前記第３レンズ群との間隔をＬ２３Ｔとし、広角端における前記第２レンズ群と前記第３レンズ群との合成焦点距離をｆ２３Ｗとし、望遠端における前記第２レンズ群と前記第３レンズ群との合成焦点距離をｆ２３Ｔとし、前記第１レンズ群の焦点距離をｆ１とし、前記正レンズの材料のｄ線におけるアッベ数をνｄｐとし、前記負レンズの材料のｄ線におけるアッベ数をνｄｎとして、  The distance between the second lens group and the third lens group at the wide angle end is L23W, the distance between the second lens group and the third lens group at the telephoto end is L23T, and the second lens group at the wide angle end. And the third lens group is set to f23W, the combined focal length of the second lens group and the third lens group at the telephoto end is set to f23T, and the focal length of the first lens group is set to f1. The Abbe number at the d-line of the positive lens material is νdp, and the Abbe number at the d-line of the negative lens material is νdn,
０．７５＜ｆ２３Ｔ／ｆ２３Ｗ＜１．００  0.75 <f23T / f23W <1.00
０．０１＜Ｌ２３Ｔ／Ｌ２３Ｗ＜０．２０  0.01 <L23T / L23W <0.20
−１５＜ｆ１／ｆ２３Ｗ＜−８．２  −15 <f1 / f23W <−8.2
１５．０＜νｄｐ−νｄｎ＜３５．０  15.0 <νdp−νdn <35.0
なる条件式を満足することを特徴とするズームレンズ。A zoom lens satisfying the following conditional expression: 前記第２レンズ群の焦点距離をｆ２とし、前記第３レンズ群の焦点距離をｆ３として、
−０．２０＜ｆ２／ｆ３＜−０．０５
なる条件式を満足することを特徴とする請求項１又は２に記載のズームレンズ。 The focal length of the second lens group and f2, the focal length of the third lens group and the f3,
−0.20 <f2 / f3 <−0.05
The zoom lens according to claim 1 or 2, characterized by satisfying the conditional expression. 前記正レンズの材料のｄ線における屈折率をＮｄｐとし、前記負レンズの材料のｄ線における屈折率をＮｄｎとして、
−０．３５＜Ｎｄｐ−Ｎｄｎ＜−０．１５
なる条件式を満足することを特徴とする請求項１乃至３のうちのいずれか１項に記載のズームレンズ。 Wherein the refractive index at the d-line of the positive lens materials and Ndp, the refractive index at the d-line of the material of the negative lens as Ndn,
−0.35 <Ndp−Ndn <−0.15
The zoom lens according to any one of claims 1 to 3, characterized by satisfying the conditional expression. 広角端から望遠端へのズーミングのために、前記第２レンズ群は像側へ移動し、前記第３レンズ群は像側に凸状の軌跡で移動し、前記第４レンズ群は物体側へ移動することを特徴とする請求項１乃至４のうちのいずれか１項に記載のズームレンズ。 For zooming from the wide-angle end to the telephoto end, the second lens unit moves toward the image side, the third lens unit moves with a locus convex toward the image side, the fourth lens group to the object side the zoom lens according to any one of claims 1 to 4, characterized in that movement. 前記第２レンズ群は、物体側から像側へ順に、２つの負レンズ、正レンズ、負レンズより構成されていることを特徴とする請求項１乃至５のうちのいずれか１項に記載のズームレンズ。 The second lens group includes, in order from the object side to the image side, two negative lenses, positive lenses, as claimed in any one of claims 1 to 5, characterized in Tei Rukoto is composed of a negative lens Zoom lens. 請求項１乃至６のうちのいずれか１項に記載のズームレンズと、
前記ズームレンズによって像が形成される像面に配された撮像素子と、
を有することを特徴とする撮像装置。 A zoom lens according to any one of claims 1 to 6,
An imaging element arranged on the image plane the image is Ru is formed by said zoom lens,
An imaging device comprising:
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