JP6808326B2 - Zoom lens and imaging device with it - Google Patents
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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、例えばデジタルカメラ、ビデオカメラ、放送用カメラ、監視用カメラ、銀塩写真用カメラなど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 imaging device having the same, and is suitable as an imaging optical system for an imaging device such as a digital camera, a video camera, a broadcasting camera, a surveillance camera, or a silver halide camera.
近年、撮像装置に用いる撮像光学系としては、レンズ全長（第１レンズ面から像面までの距離）が短く、全体として小型であり、しかも高いズーム比（変倍比）を有するズームレンズであることが要求されている。これらの要求を満足する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（特許文献１、２）。 In recent years, the imaging optical system used in an imaging device is a zoom lens having a short total lens length (distance from the first lens surface to the image plane), a small size as a whole, and a high zoom ratio (magnification ratio). Is required. As a zoom lens that satisfies these requirements, a positive lead type zoom lens in which a lens group having a positive refractive power is arranged on the most object side is known (Patent Documents 1 and 2).
特許文献１では、物体側から像側へ順に、正、負、正、正、負、正の屈折力の第１レンズ群乃至第６レンズ群から成り、ズーミングに際して各レンズ群が移動するズームレンズを開示している。特許文献２では、物体側から像側へ順に、正、負、正、正、正の第１レンズ群乃至第５レンズ群、又は正、負、正、負、正の屈折力の第１レンズ群乃至第５レンズ群よりなり、ズーミングに際して各レンズ群が移動するズームレンズを開示している。 In Patent Document 1, a zoom lens is composed of a first lens group to a sixth lens group having positive, negative, positive, positive, negative, and positive refractive powers in order from the object side to the image side, and each lens group moves during zooming. Is disclosed. In Patent Document 2, positive, negative, positive, positive, positive first lens groups to fifth lens groups, or positive, negative, positive, negative, and positive refractive power first lenses are used in this order from the object side to the image side. A zoom lens consisting of a group to a fifth lens group and in which each lens group moves during zooming is disclosed.
ポジティブリード型のズームレンズは全系の小型化を図りつつ、高ズーム比化を図ることが比較的容易である。多くのポジティブリード型のズームレンズにおいて、Ｆナンバーで決まる軸上光線は第１レンズ群を光軸から高い位置を通過する。このためポジティブリード型のズームレンズでは第１レンズ群の有効径が大きくなり、第１レンズ群が大型化してくる。また望遠端での焦点距離を長く（長焦点距離化）しつつ、高ズーム比化を図ると望遠側のズーム領域において、第１レンズ群より球面収差、コマ収差、色収差等の諸収差が多く発生してくる。 It is relatively easy to achieve a high zoom ratio while reducing the size of the entire positive lead type zoom lens. In many positive lead type zoom lenses, the on-axis ray determined by the F number passes through the first lens group at a position higher than the optical axis. Therefore, in the positive lead type zoom lens, the effective diameter of the first lens group becomes large, and the first lens group becomes large. In addition, if the focal length at the telephoto end is lengthened (longer focal length) and the zoom ratio is increased, there are more aberrations such as spherical aberration, coma, and chromatic aberration in the zoom region on the telephoto side than in the first lens group. It will occur.
このようにポジティブリード型のズームレンズでは第１レンズ群のレンズ構成が光学性能に大きく影響し、また第１レンズ群の大きさがズームレンズ全体の大きさ及び重量に大きく影響する。このためポジティブリード型のズームレンズにおいて、全系の小型化、軽量化を図りつつ、高ズーム比で全ズーム範囲で高い光学性能を得るには、レンズ群の数や各レンズ群の屈折力に加えて第１レンズ群のレンズ構成を適切に設定することが重要になってくる。特に第１レンズ群を構成するレンズの材料を適切に設定することが軽量化を図る点で重要になってくる。 As described above, in the positive lead type zoom lens, the lens configuration of the first lens group greatly affects the optical performance, and the size of the first lens group greatly affects the size and weight of the entire zoom lens. For this reason, in order to obtain high optical performance in the entire zoom range with a high zoom ratio while reducing the size and weight of the entire system in a positive lead type zoom lens, the number of lens groups and the refractive power of each lens group must be used. In addition, it is important to appropriately set the lens configuration of the first lens group. In particular, it is important to appropriately set the material of the lens constituting the first lens group in order to reduce the weight.
これらの構成を適切に設定しないと、全系の小型化、軽量化を図りつつ、高ズーム比で、諸収差を良好に補正し、全ズーム範囲で高い光学性能のズームレンズを得るのが難しくなってくる。 If these configurations are not set properly, it will be difficult to obtain a zoom lens with high optical performance in the entire zoom range by correcting various aberrations well with a high zoom ratio while reducing the size and weight of the entire system. It will be.
本発明は、高ズーム比で全ズーム範囲で良好な光学特性が得られる小型、軽量な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。 An object of the present invention is to provide a compact and lightweight zoom lens capable of obtaining good optical characteristics in the entire zoom range with a high zoom ratio, and an image pickup apparatus having the same.
本発明のズームレンズは、複数のレンズ群と開口絞りを有し、ズーミングに際して隣り合うレンズ群の間隔が変化するズームレンズにおいて、
前記複数のレンズ群は、物体側から像側へ順に配置された、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、負の屈折力の第５レンズ群、正の屈折力の第６レンズ群から構成され、
前記第１レンズ群は、物体側から像側へ順に配置された、正の屈折力の第１レンズ、負の屈折力の第２レンズから構成され、
前記第２レンズの材料は樹脂であり、
前記第１レンズの材料の屈折率とアッベ数を各々Ｎｄｐ１、νｄｐ１、前記第１レンズの焦点距離をｆｐ１、前記第２レンズの焦点距離をｆｎ２とするとき、
１．５＜｜ｆｎ２／ｆｐ１｜＜４．０
０．０１＜Ｎｄｐ１−（２．６２−０．０１６１×νｄｐ１）
なる条件式を満足することを特徴としている。
The zoom lens of the present invention is a zoom lens that has a plurality of lens groups and an aperture diaphragm , and the distance between adjacent lens groups changes during zooming.
The plurality of lens groups are arranged 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, the third lens group having a positive refractive power, and the positive lens group. It is composed of a fourth lens group with a refractive power, a fifth lens group with a negative refractive power, and a sixth lens group with a positive refractive power.
The first lens group is composed of a first lens having a positive refractive power and a second lens having a negative refractive power arranged in order from the object side to the image side.
The material of the second lens is resin,
When the refractive index and Abbe number of the material of the first lens are Ndp1 and νpd1, the focal length of the first lens is fp1, and the focal length of the second lens is fn2, respectively.
1.5 << | fn2 / fp1 | <4.0
0.01 <Ndp1- (2.62-0.0161 × νdp1)
It is characterized by satisfying the conditional expression .
本発明によれば、高ズーム比で全ズーム範囲で良好な光学特性が得られる小型、軽量なズームレンズが得られる。 According to the present invention, it is possible to obtain a compact and lightweight zoom lens that can obtain good optical characteristics in the entire zoom range with a high zoom ratio.
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配置された次のレンズ群より構成されている。 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The zoom lens of the present invention is composed of the following lens groups arranged in this order toward the image side from the object side.
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、負の屈折力の第５レンズ群、正又は負の屈折力の第６レンズ群より構成されている。開口絞りは、第３レンズ群と第４レンズ群との間に配置されている。ここでレンズ群とはズーミング及びフォーカシングに伴う光軸方向のレンズ間隔の変化によって分けられるレンズ系及び開口絞りによって分けられるレンズ系をいう。なお、レンズ群をズーミングに際して一体的に移動または静止して互いの間隔が変化するレンズのまとまりとして捉えると、後述の実施例１のズームレンズは正の屈折力の第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、負の屈折力の第４レンズ群、負の屈折力の第５レンズ群より構成されていると見ることができる。また、実施例２、３のズームレンズは正の屈折力の第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、負の屈折力の第５レンズ群、正の屈折力の第６レンズ群より構成されていると見ることができる。 Positive refractive power 1st lens group, negative refractive power 2nd lens group, positive refractive power 3rd lens group, positive refractive power 4th lens group, negative refractive power 5th lens group, It is composed of a sixth lens group having a positive or negative refractive power . The diaphragm apertures is disposed between the third lens group and the fourth lens group. Here, the lens group refers to a lens system divided by a change in the lens spacing in the optical axis direction due to zooming and focusing and a lens system divided by an aperture diaphragm. When the lens group is regarded as a group of lenses that move or stand still during zooming and the distance between them changes, the zoom lens of the first embodiment described later is the first lens group having a positive refractive power and negative refraction. It can be seen that it is composed of a second lens group of force, a third lens group of positive refractive power, a fourth lens group of negative refractive power, and a fifth lens group of negative refractive power. Further, the zoom lenses of Examples 2 and 3 have 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 fourth lens group having a positive refractive power. It can be seen that it is composed of a fifth lens group having a negative power and a sixth lens group having a positive power.
図１は実施例１のズームレンズの広角端（短焦点距離端）における無限遠物体合焦時（フォーカス時）のレンズ断面図である。図２（Ａ）、（Ｂ）は実施例１の広角端と望遠端（長焦点距離端）における無限遠物体合焦時の収差図である。実施例１はズーム比３．４３、Ｆナンバー４．４６〜６．５５のズームレンズである。 FIG. 1 is a cross-sectional view of the zoom lens of the first embodiment at the wide-angle end (short focal length end) when the object is in focus at infinity (at the time of focusing). 2 (A) and 2 (B) are aberration diagrams at the time of focusing an object at infinity at the wide-angle end and the telephoto end (long focal length end) of the first embodiment. The first embodiment is a zoom lens having a zoom ratio of 3.43 and an F number of 4.46 to 6.55.
図３は実施例２の広角端における無限遠物体合焦時のレンズ断面図である。図４（Ａ）、（Ｂ）は実施例２の広角端と望遠端における無限遠物体合焦時の収差図である。実施例２はズーム比４．２５、Ｆナンバー４．１６〜５．８８のズームレンズである。図５は実施例３の広角端における無限遠物体合焦時のレンズ断面図である。図６（Ａ）、（Ｂ）は実施例３の広角端と望遠端における無限遠物体合焦時の収差図である。実施例３はズーム比４．２５、Ｆナンバー４．１６〜５．８８のズームレンズである。図７は本発明のズームレンズを備えるデジタルカメラ（撮像装置）の要部概略図である。 FIG. 3 is a cross-sectional view of the lens at the wide-angle end of Example 2 when the object is in focus at infinity. 4 (A) and 4 (B) are aberration diagrams at the time of focusing an infinity object at the wide-angle end and the telephoto end of the second embodiment. The second embodiment is a zoom lens having a zoom ratio of 4.25 and an F number of 4.16 to 5.88. FIG. 5 is a cross-sectional view of the lens at the wide-angle end of Example 3 when the object is in focus at infinity. 6 (A) and 6 (B) are aberration diagrams at the time of focusing an infinity object at the wide-angle end and the telephoto end of the third embodiment. Example 3 is a zoom lens having a zoom ratio of 4.25 and an F number of 4.16 to 5.88. FIG. 7 is a schematic view of a main part of a digital camera (imaging device) including the zoom lens of the present invention.
各実施例のズームレンズはデジタルカメラやビデオカメラ、放送用カメラ、監視用カメラ、銀塩写真用カメラなどの撮像装置に用いられるズームレンズである。尚、実施例のズームレンズは投射装置（プロジェクタ）用の投射光学系として用いることもできる。 The zoom lens of each embodiment is a zoom lens used in an imaging device such as a digital camera, a video camera, a broadcasting camera, a surveillance camera, and a silver halide camera. The zoom lens of the embodiment can also be used as a projection optical system for a projection device (projector).
レンズ断面図において、左方が物体側（前方）で、右方が像側（後方）である。また、レンズ断面図において、ＯＬはズームレンズである。ＯＡは光軸である。またレンズ断面図においてｉを物体側からのレンズ群の順番とすると、Ｌｉは第ｉレンズ群を示す。ＳＰは開口絞りである。 In the cross-sectional view of the lens, the left side is the object side (front) and the right side is the image side (rear). Further, in the cross-sectional view of the lens, OL is a zoom lens. OA is the optical axis. Further, when i is the order of the lens groups from the object side in the lens cross-sectional view, Li indicates the i-th lens group. SP is an aperture stop.
ＩＰは像面である。像面ＩＰは、デジタルカメラやビデオカメラなどの撮像装置としてズームレンズを使用する際には、ＣＣＤセンサやＣＭＯＳセンサなどの撮像素子（光電変換素子）の撮像面に相当する。銀塩フィルムカメラの撮像装置としてズームレンズを使用する際には、フィルム面に相当する。広角端から望遠端へのズーミングに際して、矢印に示すように、隣り合うレンズ群の間隔が変化するように各レンズ群が移動する。 IP is an image plane. The image plane IP corresponds to the image pickup surface of an image pickup element (photoelectric conversion element) such as a CCD sensor or a CMOS sensor when a zoom lens is used as an image pickup device such as a digital camera or a video camera. When a zoom lens is used as an image pickup device for a silver halide film camera, it corresponds to a film surface. When zooming from the wide-angle end to the telephoto end, each lens group moves so that the distance between adjacent lens groups changes as shown by the arrow.
無限遠物体から近距離物体へのフォーカシングに際して、第５レンズ群Ｌ５が像側へ移動する。レンズ断面図には記載していないが、最終レンズ面と像面との間には必要に応じてローパスフィルターやＩＲカットフィルター等を配置することもある。各実施例において撮像された画像を画像処理装置に読み込み、画像合成処理を行っても良い。 When focusing from an infinite object to a short-distance object, the fifth lens group L5 moves to the image side. Although not shown in the cross-sectional view of the lens, a low-pass filter, an IR cut filter, or the like may be arranged between the final lens surface and the image surface as needed. The image captured in each embodiment may be read into an image processing device and image composition processing may be performed.
球面収差図について、ＦｎｏはＦナンバーである。また実線のｄはｄ線（波長５８７．６ｎｍ）、二点鎖線のｇはｇ線（波長４３５．８ｎｍ）である。非点収差図において点線のＭはｄ線におけるメリディオナル像面、実線のＳはｄ線におけるサジタル像面である。歪曲収差図はｄ線について示している。倍率色収差図はｄ線に対するｇ線について示している。ωは半画角（度）である。 For the spherical aberration diagram, Fno is the F number. The solid line d is the d line (wavelength 587.6 nm), and the alternate long and short dash line g is the g line (wavelength 435.8 nm). In the astigmatism diagram, the dotted line M is the meridional image plane on the d line, and the solid line S is the sagittal image plane on the d line. The distortion diagram shows the d-line. The chromatic aberration of magnification diagram shows the g-line with respect to the d-line. ω is the half angle of view (degrees).
各実施例のズームレンズは、物体側から像側へ順に、次のとおりに配置されたレンズ群より構成されている。正の屈折力の第１レンズ群Ｌ１、負の屈折力の第２レンズ群Ｌ２、正の屈折力の第３レンズ群Ｌ３、開口絞りＳＰ、正の屈折力の第４レンズ群Ｌ４，負の屈折力の第５レンズ群Ｌ５、正又は負の屈折力の第６レンズ群Ｌ６から構成されている。 The zoom lens of each embodiment is composed of a group of lenses arranged as follows in order from the object side to the image side. Positive refractive power 1st lens group L1, negative refractive power 2nd lens group L2, positive refractive power 3rd lens group L3, aperture aperture SP, positive refractive power 4th lens group L4, negative It is composed of a fifth lens group L5 having a refractive power and a sixth lens group L6 having a positive or negative refractive power.
実施例１において第６レンズ群Ｌ６は負の屈折力である。実施例２、３において第６レンズ群Ｌ６は正の屈折力である。実施例１では、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Ｌ２は像側へ凸状の軌跡で移動し、第１レンズ群Ｌ１、第３レンズ群Ｌ３、第４レンズ群Ｌ４、第５レンズ群Ｌ５、第６レンズ群Ｌ６は物体側へ移動する。 In Example 1, the sixth lens group L6 has a negative refractive power. In Examples 2 and 3, the sixth lens group L6 has a positive refractive power. In the first embodiment, when zooming from the wide-angle end to the telephoto end, the second lens group L2 moves in a convex locus toward the image side, and the first lens group L1, the third lens group L3, the fourth lens group L4, and the first lens group L2. The 5 lens group L5 and the 6th lens group L6 move to the object side.
第３レンズ群Ｌ３と第４レンズ群Ｌ４は一体的に（同じ軌跡で）移動する。広角端に比べて望遠端において第１レンズ群Ｌ１と第２レンズ群Ｌ２の間隔が大きく、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔が小さく、第４レンズ群Ｌ４と第５レンズ群Ｌ５の間隔が小さく、第５レンズ群Ｌ５と第６レンズ群Ｌ６の間隔が小さくなる。開口絞りＳＰは、第３レンズ群Ｌ３、第４レンズ群Ｌ４と一体的に移動する。 The third lens group L3 and the fourth lens group L4 move integrally (with the same trajectory). The distance between the first lens group L1 and the second lens group L2 is larger at the telescopic end than at the wide-angle end, the distance between the second lens group L2 and the third lens group L3 is smaller, and the distance between the fourth lens group L4 and the fifth lens group is small. The distance between L5 is small, and the distance between the fifth lens group L5 and the sixth lens group L6 is small. The aperture diaphragm SP moves integrally with the third lens group L3 and the fourth lens group L4.
実施例２、３では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Ｌ２は像側へ凸状の軌跡で移動し、第１レンズ群Ｌ１、第３レンズ群Ｌ３、第４レンズ群Ｌ４、第５レンズ群Ｌ５、第６レンズ群Ｌ６は物体側へ互いに独立に（異なった軌跡で）移動する。即ち、実施例２、３では、ズーミングに際して隣り合うレンズ群の間隔が変化する。 In Examples 2 and 3, the second lens group L2 moves in a convex locus toward the image side during zooming from the wide-angle end to the telephoto end, and the first lens group L1, the third lens group L3, and the fourth lens group L4, The fifth lens group L5 and the sixth lens group L6 move independently of each other (with different trajectories) toward the object side. That is, in Examples 2 and 3, the distance between adjacent lens groups changes during zooming.
広角端に比べて望遠端において、第１レンズ群Ｌ１と第２レンズ群Ｌ２の間隔が大きく、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔が小さく、第３レンズ群Ｌ３と第４レンズ群Ｌ４が小さくなる。更に第４レンズ群Ｌ４と第５レンズ群Ｌ５の間隔が大きく、第５レンズ群Ｌ５と第６レンズ群Ｌ６の間隔が小さくなる。開口絞りＳＰは、第３レンズ群Ｌ３と一体的に移動する。 At the telephoto end, the distance between the first lens group L1 and the second lens group L2 is larger, the distance between the second lens group L2 and the third lens group L3 is smaller, and the distance between the third lens group L3 and the fourth lens is smaller than at the wide-angle end. The group L4 becomes smaller. Further, the distance between the fourth lens group L4 and the fifth lens group L5 is large, and the distance between the fifth lens group L5 and the sixth lens group L6 is small. The aperture diaphragm SP moves integrally with the third lens group L3.
各実施例において、第１レンズ群Ｌ１は、物体側から像側へ順に配置された、正（正の屈折力）の第１レンズ、負（負の屈折力）の第２レンズから構成されている。第２レンズの材料は樹脂であり、第１レンズの材料の屈折率とアッベ数を各々Ｎｄｐ１、νｄｐ１とする。第１レンズの焦点距離をｆｐ１、第２レンズの焦点距離をｆｎ２とする。このとき、
１．５＜｜ｆｎ２／ｆｐ１｜＜４．０ ・・・（１）
０．０１＜Ｎｄｐ１−（２．６２−０．０１６１×νｄｐ１） ・・・（２）
なる条件式を満足する。
In each embodiment, the first lens group L1 is composed of a positive (positive refractive power) first lens and a negative (negative refractive power) second lens arranged in order from the object side to the image side. There is. The material of the second lens is resin, and the refractive index and the Abbe number of the material of the first lens are Ndp1 and νdp1, respectively. Let the focal length of the first lens be fp1 and the focal length of the second lens be fn2. At this time,
1.5 << | fn2 / fp1 | <4.0 ... (1)
0.01 <Ndp1- (2.62-0.0161 × νdp1) ・ ・ ・ (2)
Satisfies the conditional expression.
第１レンズ群Ｌ１は物体側より像側へ順に、正の第１レンズ、負の第２レンズからなり、第２レンズの材料は樹脂である。第１レンズ群Ｌ１の有効径は望遠端におけるＦナンバーで決まる軸上光束径に相当し、第１レンズ群Ｌ１は高重量となる傾向がある。本発明では、第１レンズ群Ｌ１に一般的なガラスに比べて比重の小さな樹脂を使用することで、ズームレンズを軽量化している。 The first lens group L1 is composed of a positive first lens and a negative second lens in this order from the object side to the image side, and the material of the second lens is resin. The effective diameter of the first lens group L1 corresponds to the axial luminous flux diameter determined by the F number at the telephoto end, and the first lens group L1 tends to be heavy. In the present invention, the weight of the zoom lens is reduced by using a resin having a specific gravity smaller than that of general glass for the first lens group L1.
しかしながら、一般的に樹脂はガラスに比べて、温度変化による屈折率の変化などが大きい。そのため、樹脂よりなるレンズは、温度変化による光学的な性能変化(例えばピントズレや球面収差のズレ)が大きくなりやすい。また、樹脂は温度による屈折率の変化量が負の値である。即ち、温度が高くなると可視光や領域（波長４００ｎｍ〜７００ｎｍ）において、屈折率が低下する。このため、正レンズの材料に温度による屈折率の変化量が正の値のガラス材料を用いると、温度変化による光学的な性能変化がさらに増大してくる。 However, in general, resin has a larger change in refractive index due to temperature change than glass. Therefore, a lens made of resin tends to have a large optical performance change (for example, a focus shift or a spherical aberration shift) due to a temperature change. Further, the amount of change in the refractive index of the resin due to temperature is a negative value. That is, as the temperature rises, the refractive index decreases in visible light and in the region (wavelength 400 nm to 700 nm). Therefore, if a glass material in which the amount of change in the refractive index due to temperature is a positive value is used as the material for the positive lens, the optical performance change due to the temperature change is further increased.
一般的に殆どのガラス材料は、温度による屈折率の変化量が正の値であるが、一部の低分散材料の温度による屈折率の変化量は負の値となっている。全ズーム域で温度変化による光学的な性能変化を抑制するためには各レンズ群内で温度変化による光学的な性能変化を小さくする必要がある。 In general, most glass materials have a positive value in the amount of change in the refractive index with temperature, but some low-dispersion materials have a negative value in the amount of change in the refractive index with temperature. In order to suppress the optical performance change due to temperature change in the entire zoom range, it is necessary to reduce the optical performance change due to temperature change in each lens group.
本発明のズームレンズは第１レンズ群Ｌ１に含まれる正レンズの材料に低分散材料を使用することで、負レンズから発生する温度変化による光学的な性能変化を抑制しつつ望遠側において軸上色収差や倍率色収差を良好に補正している。また本発明のズームレンズは第１レンズ群Ｌ１に含まれる負の第２レンズに非球面を用いることで、第１レンズ群Ｌ１に含まれる正レンズより発生する球面収差・コマ収差等の諸収差を良好に補正している。 The zoom lens of the present invention uses a low-dispersion material as the material of the positive lens included in the first lens group L1, so that the optical performance change due to the temperature change generated from the negative lens is suppressed and the lens is axially on the telescopic side. Chromatic aberration and chromatic aberration of magnification are satisfactorily corrected. Further, the zoom lens of the present invention uses an aspherical surface for the negative second lens included in the first lens group L1, so that various aberrations such as spherical aberration and coma generated from the positive lens included in the first lens group L1 are generated. Is corrected well.
条件式（１）は第１レンズ群Ｌ１に含まれる第１レンズの焦点距離ｆｐ１と第２レンズの焦点距離ｆｎ２の比を規定する。条件式（１）の上限を超えて、第２レンズの負の屈折力が弱くなると（負の屈折力の絶対値が小さくなると）第１レンズ群Ｌ１に含まれる第１レンズより発生する球面収差とコマ収差等の諸収差の補正が困難になる。逆に条件式（１）の下限を超えて、第２レンズの負の屈折力が強くなると（負の屈折力の絶対値が大きくなると）、温度変化による光学的な性能変化が大きくなってくる。 The conditional expression (1) defines the ratio of the focal length fp1 of the first lens and the focal length fn2 of the second lens included in the first lens group L1. When the negative refractive power of the second lens becomes weaker than the upper limit of the conditional equation (1) (when the absolute value of the negative refractive power becomes smaller), spherical aberration generated from the first lens included in the first lens group L1. It becomes difficult to correct various aberrations such as coma. On the contrary, when the lower limit of the conditional equation (1) is exceeded and the negative refractive power of the second lens becomes stronger (when the absolute value of the negative refractive power becomes larger), the optical performance change due to the temperature change becomes larger. ..
条件式（２）を満たすことで、第１レンズ群Ｌ１に含まれる正の第１レンズの材料の温度による屈折率の変化量が負の値となり、第１レンズ群Ｌ１に含まれる負の第２レンズより発生する温度変化による光学的な性能変化を軽減している。さらに第１レンズ群Ｌ１に含まれる正の第１レンズの材料に低分散材料を使用することにより望遠側において軸上色収差や倍率色収差を良好に補正している。更に好ましくは、条件式（１）、（２）の数値範囲を以下の範囲とするのが良い。 By satisfying the conditional expression (2), the amount of change in the refractive index due to the temperature of the material of the positive first lens included in the first lens group L1 becomes a negative value, and the negative number included in the first lens group L1 becomes a negative value. The optical performance change due to the temperature change generated by the two lenses is reduced. Further, by using a low-dispersion material as the material of the positive first lens included in the first lens group L1, axial chromatic aberration and magnification chromatic aberration are satisfactorily corrected on the telephoto side. More preferably, the numerical range of the conditional expressions (1) and (2) is set to the following range.
１．６＜｜ｆｎ２／ｆｐ１｜＜３．８ ・・・（１ａ）
０．０３＜Ｎｄｐ１−（２．６２−０．０１６１×νｄｐ１） ・・・（２ａ）
1.6 << | fn2 / fp1 | <3.8 ... (1a)
0.03 <Ndp1- (2.62-0.0161 × νdp1) ・ ・ ・ (2a)
更に好ましくは、以下の範囲とするのが良い。
１．７＜｜ｆｎ２／ｆｐ１｜＜３．５ ・・・（１ｂ）
０．０５＜Ｎｄｐ１−（２．６２−０．０１６１×νｄｐ１） ・・・（２ｂ）
More preferably, it is in the following range.
1.7 << | fn2 / fp1 | <3.5 ... (1b)
0.05 <Ndp1- (2.62-0.0161 × νdp1) ・ ・ ・ (2b)
各実施例において更に好ましくは次の条件式のうち１つ以上を満足するのが良い。第２レンズの材料の屈折率とアッベ数を各々Ｎｄｎ２、νｄｎ２とする。第２レンズの物体側のレンズ面と像側のレンズ面の曲率半径を各々Ｒ２ａ、Ｒ２ｂとする。広角端における全系の焦点距離をｆｗとする。このとき、次の条件式のうち１つ以上を満足するのが良い。 More preferably, one or more of the following conditional expressions is satisfied in each embodiment. Let the refractive index and Abbe number of the material of the second lens be Ndn2 and νdn2, respectively. The radius of curvature of the lens surface on the object side and the lens surface on the image side of the second lens are R2a and R2b, respectively. Let fw be the focal length of the entire system at the wide-angle end. At this time, it is preferable to satisfy one or more of the following conditional expressions.
０．０１＜０．０００２５９×νｄｎ２2−０．０２６４×νｄｎ２＋２．２１３−Ｎｄｎ２ ・・・（３）
１５．０＜νｄｎ２＜６０．０ ・・・（４）
０．１５≦（Ｒ２ａ−Ｒ２ｂ）／（Ｒ２ａ＋Ｒ２ｂ）≦０．５５ ・・・（５）
１．５≦｜ｆｎ２／ｆｗ｜≦６．０ ・・・（６）
0.01 <0.000259 × νdn2 2 −0.0264 × νdn2 + 2.213-Ndn2 ・ ・ ・ (3)
15.0 <νdn2 <60.0 ... (4)
0.15 ≤ (R2a-R2b) / (R2a + R2b) ≤ 0.55 ... (5)
1.5 ≦ | fn2 / fw | ≦ 6.0 ・ ・ ・ (6)
次に前述の条件式の技術的意味について説明する。条件式（３）および（４）は、負の第２レンズの材料で使用すると好ましい樹脂の屈折率とアッベ数の存在範囲を規定したものである。条件式（３）、（４）の範囲内であれば、成形性・透過率などの点から、光学レンズとして良好に適用できる。第１レンズ群Ｌ１は望遠端におけるＦナンバーで決まる軸上光束の径以上の外径となる。このため第１レンズ群Ｌ１の重量が重くなる傾向にあり、この第１レンズ群Ｌ１に含まれる負の第２レンズにガラスに比べて軽量な樹脂を使用することで、ズームレンズ全体を軽量化している。 Next, the technical meaning of the above conditional expression will be described. The conditional expressions (3) and (4) define the refractive index of the resin and the existence range of the Abbe number, which are preferable to be used as the material of the negative second lens. If it is within the range of the conditional expressions (3) and (4), it can be satisfactorily applied as an optical lens in terms of moldability, transmittance and the like. The first lens group L1 has an outer diameter equal to or larger than the diameter of the axial luminous flux determined by the F number at the telephoto end. For this reason, the weight of the first lens group L1 tends to be heavy, and by using a resin that is lighter than glass for the negative second lens included in the first lens group L1, the weight of the entire zoom lens is reduced. ing.
条件式（５）は、第１レンズ群Ｌ１に含まれる負の第２レンズの形状因子を規定する。各実施例において第２レンズは物体側に凸面を向けたメニスカス形状のレンズよりなる。また第２レンズは非球面形状のレンズ面を有している。 The conditional expression (5) defines the shape factor of the negative second lens included in the first lens group L1. In each embodiment, the second lens comprises a meniscus-shaped lens with a convex surface facing the object side. The second lens has an aspherical lens surface.
第２レンズの像側のレンズ面にて軸上光束を大きく屈折させることで第１レンズ群Ｌ１において球面収差・コマ収差をバランス良く補正している。条件式（５）の上限を超えると負の第２レンズの像側のレンズ面より球面収差・コマ収差等の諸収差が多く発生してきて、これらの諸収差の補正が困難になる。また、条件式（５）の下限を超えると負の第２レンズの屈折力が少なくなり、第１レンズ群Ｌ１において色収差の補正が困難になってくる。 Spherical aberration and coma are corrected in a well-balanced manner in the first lens group L1 by greatly refracting the axial luminous flux on the lens surface on the image side of the second lens. When the upper limit of the conditional equation (5) is exceeded, a large amount of various aberrations such as spherical aberration and coma are generated from the lens surface on the image side of the negative second lens, and it becomes difficult to correct these various aberrations. Further, when the lower limit of the conditional expression (5) is exceeded, the refractive power of the negative second lens becomes small, and it becomes difficult to correct the chromatic aberration in the first lens group L1.
条件式（６）は、第１レンズ群Ｌ１に含まれる負の第２レンズの焦点距離と広角端における全系の焦点距離の比を規定する。条件式（６）の上限を超えると第２レンズの負の屈折力が弱まり第１レンズ群Ｌ１内において色収差を良好に補正するのが困難になる。また条件式（６）の下限を超えると第２レンズの負の屈折力が強くなりすぎて、第１レンズ群Ｌ１内において球面収差・コマ収差の補正が困難になってくる。更に好ましくは条件式（３）乃至（６）の数値範囲を次の如く設定するのが良い。 Conditional expression (6) defines the ratio of the focal length of the negative second lens included in the first lens group L1 to the focal length of the entire system at the wide-angle end. If the upper limit of the conditional expression (6) is exceeded, the negative refractive power of the second lens weakens, and it becomes difficult to satisfactorily correct the chromatic aberration in the first lens group L1. Further, if the lower limit of the conditional equation (6) is exceeded, the negative refractive power of the second lens becomes too strong, and it becomes difficult to correct spherical aberration and coma aberration in the first lens group L1. More preferably, the numerical range of the conditional expressions (3) to (6) is set as follows.
０．０３＜０．０００２５９×νｄｎ２2−０．０２６４×νｄｎ２＋２．２１３−Ｎｄｎ２ ・・・（３ａ）
２０．０＜νｄｎ２＜５０．０ ・・・（４ａ）
０．１９≦（Ｒ２ａ−Ｒ２ｂ）／（Ｒ２ａ＋Ｒ２ｂ）≦０．４０ ・・・（５ａ）
２．０≦｜ｆｎ２／ｆｗ｜≦５．０ ・・・（６ａ）
0.03 <0.000259 × νdn2 2 −0.0264 × νdn2 + 2.213-Ndn2 ・ ・ ・ (3a)
20.0 <νdn2 <50.0 ... (4a)
0.19 ≤ (R2a-R2b) / (R2a + R2b) ≤ 0.40 ... (5a)
2.0 ≦ | fn2 / fw | ≦ 5.0 ・ ・ ・ (6a)
各実施例において第２レンズ群Ｌ２は物体側から像側へ順に負レンズと正レンズを接合した接合レンズ、負レンズより構成されている。第３レンズ群Ｌ３は物体側から像側へ順に、正レンズ、正レンズ、正レンズと負レンズを接合した接合レンズより構成されている。または、第３レンズ群Ｌ３は物体側から像側へ順に、正レンズ、正レンズと負レンズを接合した接合レンズより構成されている。 In each embodiment, the second lens group L2 is composed of a bonded lens and a negative lens in which a negative lens and a positive lens are joined in order from the object side to the image side. The third lens group L3 is composed of a positive lens, a positive lens, and a bonded lens in which a positive lens and a negative lens are joined in this order from the object side to the image side. Alternatively, the third lens group L3 is composed of a positive lens and a bonded lens in which a positive lens and a negative lens are joined in this order from the object side to the image side.
第４レンズ群Ｌ４は物体側から像側へ順に、正レンズ、負レンズ、正レンズより構成されている。または第４レンズ群Ｌ４は物体側から像側へ順に、負レンズ、正レンズ、正レンズより構成されている。又は第４レンズ群Ｌ４は正レンズより構成されている。第５レンズ群Ｌ５は物体側から像側へ順に、正レンズと負レンズを接合した接合レンズより構成されている。又は第５レンズ群Ｌ５は物体側から像側へ順に、正レンズ、負レンズより構成されている。 The fourth lens group L4 is composed of a positive lens, a negative lens, and a positive lens in this order from the object side to the image side. Alternatively, the fourth lens group L4 is composed of a negative lens, a positive lens, and a positive lens in this order from the object side to the image side. Alternatively, the fourth lens group L4 is composed of a positive lens. The fifth lens group L5 is composed of a bonded lens in which a positive lens and a negative lens are joined in order from the object side to the image side. Alternatively, the fifth lens group L5 is composed of a positive lens and a negative lens in this order from the object side to the image side.
第６レンズ群Ｌ６は物体側から像側へ順に、正レンズと負レンズを接合した接合レンズより構成されている。又は第６レンズ群Ｌ６は正レンズより構成されている。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。 The sixth lens group L6 is composed of a bonded lens in which a positive lens and a negative lens are joined in order from the object side to the image side. Alternatively, the sixth lens group L6 is composed of a positive lens. Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.
次に本発明のズームレンズを用いたデジタルスチルカメラ（撮像装置）の実施例を図７を用いて説明する。図７において、２０はカメラ本体、２１は本発明のズームレンズによって構成された撮像光学系である。２２はカメラ本体に内蔵され、撮像光学系２１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）、２３は固体撮像素子２２によって光電変換された被写体像に対応する情報を記録するメモリである。２４は液晶ディスプレイパネル等によって構成され、固体撮像素子２２上に形成された被写体像を観察するためのファインダである。 Next, an example of a digital still camera (imaging apparatus) using the zoom lens of the present invention will be described with reference to FIG. 7. In FIG. 7, 20 is a camera body, and 21 is an imaging optical system composed of the zoom lens of the present invention. Reference numeral 22 is a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor that is built in the camera body and receives a subject image formed by the image pickup optical system 21, and 23 is a subject image photoelectrically converted by the solid-state image sensor 22. It is a memory that records the information corresponding to. Reference numeral 24 denotes a finder composed of a liquid crystal display panel or the like and for observing a subject image formed on the solid-state image sensor 22.
以下に、実施例１乃至３に各々対応する数値データ１乃至３を示す。各数値データにおいて、ｉは物体側からの面の順番を示し、ｒｉは第ｉ番目（第ｉ面）の光学面の曲率半径である。ｄｉは第ｉ面と第ｉ＋１面との間の間隔である。ｎｄｉ、νｄｉはそれぞれｄ線を基準とした第ｉ番目の光学部材の材料の屈折率、アッベ数を示す。ＢＦはバックフォーカスである。＊はその面が非球面であることを示す。非球面データには、非球面を次式で表した場合の非球面係数を示す。 The numerical data 1 to 3 corresponding to Examples 1 to 3 are shown below. In each numerical data, i indicates the order of the surfaces from the object side, and ri is the radius of curvature of the i-th (i-th surface) optical surface. di is the distance between the i-th plane and the i + 1-th plane. ndi and νdi indicate the refractive index and Abbe number of the material of the i-th optical member with respect to the d line, respectively. BF is the back focus. * Indicates that the surface is aspherical. The aspherical surface data shows the aspherical coefficient when the aspherical surface is expressed by the following equation.
ｘ＝（ｈ2／Ｒ）／［１＋｛１−（１＋ｋ）（ｈ／Ｒ）2｝1/2 ＋Ｂ・ｈ4＋Ｃ・ｈ6＋Ｄ・ｈ8＋Ｅ・ｈ10＋Ｆ・ｈ12
但し、ｘは光軸方向の基準面からの変位量、ｈは光軸に対して垂直な方向の高さ、Ｒはベースとなる２次曲面の半径（近軸曲率半径）、Ｂ、Ｃ、Ｄ、Ｅ、Ｆはそれぞれ４次、６次、８次、１０次、１２次の非球面係数である。尚、「ｅ−Ｚ」の表示は「１０−Ｚ」を意味する。又前述の各条件式と数値データにおける諸数値との関係を表１に示す
x = (h 2 / R) / [1 + {1- (1 + k) (h / R) 2 } 1/2 + B · h 4 + C · h 6 + D · h 8 + E · h 10 + F · h 12
However, x is the amount of displacement from the reference plane in the optical axis direction, h is the height in the direction perpendicular to the optical axis, R is the radius of the base quadratic curved surface (paraxial radius of curvature), B, C, D, E, and F are the 4th, 6th, 8th, 10th, and 12th order aspherical coefficients, respectively. It should be noted that the display of the "e-Z" means "10 -Z". Table 1 shows the relationship between each of the above conditional expressions and various numerical values in the numerical data.
（数値データ１）
単位 mm
面データ
面番号 r d nd νd
1 42.980 4.14 1.49700 81.5
2 -225.898 0.15
3* 72.101 2.00 1.63200 23.0
4* 48.553 (可変)
5 -380.593 1.00 1.80610 40.9
6 16.351 3.17 1.80809 22.8
7 50.526 1.68
8 -39.604 0.90 1.80400 46.6
9 -430.395 (可変)
10 23.789 2.69 1.48749 70.2
11 249.952 0.15
12 34.029 1.96 1.48749 70.2
13 120.136 0.15
14 23.594 3.10 1.49700 81.5
15 -192.978 0.80 1.84666 23.9
16 61.896 2.72
17(絞り) ∞ 1.62
18* 50.979 1.83 1.58313 59.4
19* -119.118 0.10
20 86.154 0.70 1.74320 49.3
21 18.571 3.54
22 30.757 1.64 1.80400 46.6
23 378.164 (可変)
24 57.890 1.50 1.64769 33.8
25 -71.168 0.60 1.71300 53.9
26 23.888 (可変)
27 -24.918 3.88 1.70154 41.2
28 -15.640 1.00 1.51633 64.1
29 -62.673 (可変)
像面 ∞
(Numerical data 1)
Unit mm
Surface data Surface number rd nd ν d
1 42.980 4.14 1.49700 81.5
2 -225.898 0.15
3 * 72.101 2.00 1.63200 23.0
4 * 48.553 (variable)
5 -380.593 1.00 1.80610 40.9
6 16.351 3.17 1.80809 22.8
7 50.526 1.68
8-39.604 0.90 1.80400 46.6
9 -430.395 (variable)
10 23.789 2.69 1.48749 70.2
11 249.952 0.15
12 34.029 1.96 1.48749 70.2
13 120.136 0.15
14 23.594 3.10 1.49700 81.5
15 -192.978 0.80 1.84666 23.9
16 61.896 2.72
17 (Aperture) ∞ 1.62
18 * 50.979 1.83 1.58313 59.4
19 * -119.118 0.10
20 86.154 0.70 1.74320 49.3
21 18.571 3.54
22 30.757 1.64 1.80400 46.6
23 378.164 (variable)
24 57.890 1.50 1.64769 33.8
25 -71.168 0.60 1.71300 53.9
26 23.888 (variable)
27 -24.918 3.88 1.70154 41.2
28 -15.640 1.00 1.51633 64.1
29 -62.673 (variable)
Image plane ∞
非球面データ
第3面
K = 2.19928e+000 B= 1.54417e-006 C= 2.05615e-012 D=-4.40206e-011 E=-1.05898e-014 F= 3.51711e-016
第4面
K = 6.71929e-001 B= 2.97626e-006 C= 8.93201e-010 D=-4.17353e-011 E=-1.44200e-013 F= 8.32274e-016
第18面
K = 0.00000e+000 B=-4.17264e-005 C=-3.93350e-007 D= 6.00710e-009 E=-5.33229e-011 F= 4.71962e-013
第19面
K = 0.00000e+000 B=-5.26752e-006 C=-4.61488e-007 D= 9.08962e-009 E=-8.83292e-011 F= 6.35210e-013
Aspherical data third surface
K = 2.19928e + 000 B = 1.54417e-006 C = 2.05615e-012 D = -4.40206e-011 E = -1.05898e-014 F = 3.51711e-016
4th side
K = 6.71929e-001 B = 2.97626e-006 C = 8.93201e-010 D = -4.17353e-011 E = -1.44200e-013 F = 8.32274e-016
Page 18
K = 0.00000e + 000 B = -4.17264e-005 C = -3.93350e-007 D = 6.00710e-009 E = -5.33229e-011 F = 4.71962e-013
Page 19
K = 0.00000e + 000 B = -5.26752e-006 C = -4.61488e-007 D = 9.08962e-009 E = -8.83292e-011 F = 6.35210e-013
各種データ
ズーム比 3.43
広角 中間 望遠
焦点距離 56.90 135.00 195.00
Fナンバー 4.46 5.44 6.55
半画角（度） 13.50 5.78 4.01
像高 13.66 13.66 13.66
レンズ全長 104.19 129.98 145.58
BF 10.00 27.16 53.17
d 4 2.48 30.56 35.68
d 9 19.18 5.80 1.00
d16 2.72 2.72 2.72
d23 3.56 3.46 2.77
d26 27.96 22.00 11.97
d29 10.00 27.16 53.17
ｆｎ２ -243.22
ｆｐ１ 73.03
Various data Zoom ratio 3.43
Wide-angle medium telephoto focal length 56.90 135.00 195.00
F number 4.46 5.44 6.55
Half angle of view (degrees) 13.50 5.78 4.01
Image height 13.66 13.66 13.66
Total lens length 104.19 129.98 145.58
BF 10.00 27.16 53.17
d 4 2.48 30.56 35.68
d 9 19.18 5.80 1.00
d16 2.72 2.72 2.72
d23 3.56 3.46 2.77
d26 27.96 22.00 11.97
d29 10.00 27.16 53.17
fn2 -243.22
fp1 73.03
ズームレンズ群データ
群 始面 焦点距離
1 1 100.60
2 5 -26.95
3 10 28.13
4 17 96.21
5 24 -52.20
6 27 -149.27
Zoom lens group Data group Start surface Focal length
1 1 100.60
2 5 -26.95
3 10 28.13
4 17 96.21
5 24 -52.20
6 27 -149.27
（数値データ２）
単位 mm
面データ
面番号 r d nd νd
1 47.990 6.75 1.43875 94.9
2 -510.932 0.20
3* 84.144 3.00 1.58306 30.2
4* 54.276 (可変)
5 -84.332 0.80 1.71300 53.9
6 20.906 2.63 1.80809 22.8
7 48.821 2.06
8 -43.785 0.80 1.80400 46.6
9 -192.725 (可変)
10 70.826 3.34 1.80400 46.6
11 -58.771 0.20
12 37.002 5.48 1.49700 81.5
13 -37.702 1.12 1.90366 31.3
14 135.775 4.48
15(絞り) ∞ (可変)
16 3235.557 1.00 1.80610 33.3
17 36.393 0.28
18 45.951 3.11 1.72916 54.7
19 -53.518 0.10
20 32.713 2.32 1.65844 50.9
21 93.413 (可変)
22 -91.450 1.47 1.76182 26.5
23 -35.913 1.61
24 -37.490 0.70 1.69680 55.5
25 30.679 (可変)
26 60.815 1.99 1.54072 47.2
27 350.222 (可変)
像面 ∞
(Numerical data 2)
Unit mm
Surface data Surface number rd nd ν d
1 47.990 6.75 1.43875 94.9
2-510.932 0.20
3 * 84.144 3.00 1.58306 30.2
4 * 54.276 (variable)
5 -84.332 0.80 1.71300 53.9
6 20.906 2.63 1.80809 22.8
7 48.821 2.06
8-43.785 0.80 1.80400 46.6
9 -192.725 (variable)
10 70.826 3.34 1.80400 46.6
11 -58.771 0.20
12 37.002 5.48 1.49700 81.5
13 -37.702 1.12 1.90366 31.3
14 135.775 4.48
15 (Aperture) ∞ (Variable)
16 3235.557 1.00 1.80610 33.3
17 36.393 0.28
18 45.951 3.11 1.72916 54.7
19 -53.518 0.10
20 32.713 2.32 1.65844 50.9
21 93.413 (variable)
22 -91.450 1.47 1.76182 26.5
23 -35.913 1.61
24-37.490 0.70 1.69680 55.5
25 30.679 (variable)
26 60.815 1.99 1.54072 47.2
27 350.222 (variable)
Image plane ∞
非球面データ
第3面
K = 0.00000e+000 B= 3.12418e-006 C=-2.94581e-009 D= 1.12623e-012
第4面
K = 0.00000e+000 B= 4.27708e-006 C=-2.30707e-009 D= 6.84523e-013 E= 9.16291e-016
Aspherical data third surface
K = 0.00000e + 000 B = 3.12418e-006 C = -2.94581e-009 D = 1.12623e-012
4th side
K = 0.00000e + 000 B = 4.27708e-006 C = -2.30707e-009 D = 6.84523e-013 E = 9.16291e-016
各種データ
ズーム比 4.25
広角 中間 望遠
焦点距離 56.81 135.00 241.30
Fナンバー 4.16 5.18 5.88
半画角（度） 13.52 5.78 3.24
像高 13.66 13.66 13.66
レンズ全長 147.26 189.92 210.00
BF 38.74 58.01 65.29
d 4 7.21 49.88 69.96
d 9 27.21 12.59 1.69
d15 10.00 5.35 8.97
d21 3.86 4.78 5.93
d25 16.78 15.86 14.71
d27 38.74 58.01 65.29
ｆｎ２ -272.32
ｆｐ１ 100.36
Various data Zoom ratio 4.25
Wide-angle medium telephoto focal length 56.81 135.00 241.30
F number 4.16 5.18 5.88
Half angle of view (degrees) 13.52 5.78 3.24
Image height 13.66 13.66 13.66
Total lens length 147.26 189.92 210.00
BF 38.74 58.01 65.29
d 4 7.21 49.88 69.96
d 9 27.21 12.59 1.69
d15 10.00 5.35 8.97
d21 3.86 4.78 5.93
d25 16.78 15.86 14.71
d27 38.74 58.01 65.29
fn2 -272.32
fp1 100.36
ズームレンズ群データ
群 始面 焦点距離
1 1 150.15
2 5 -28.20
3 10 42.79
4 16 46.55
5 22 -36.05
6 26 135.78
Zoom lens group Data group Start surface Focal length
1 1 150.15
2 5 -28.20
3 10 42.79
4 16 46.55
5 22 -36.05
6 26 135.78
（数値データ３）
単位 mm
面データ
面番号 r d nd νd
1 42.393 9.21 1.59522 67.7
2 14276.464 0.20
3* 78.681 3.00 1.58306 30.2
4* 37.340 (可変)
5 542.237 0.80 1.90366 31.3
6 15.953 3.12 1.92286 18.9
7 43.630 2.16
8 -33.449 0.80 1.72916 54.7
9 -307.398 (可変)
10* 248.505 2.76 1.58306 30.2
11* -47.388 2.87
12 27.010 5.91 1.49700 81.5
13 -30.856 1.00 2.00069 25.5
14 395.596 8.30
15(絞り) ∞ (可変)
16* 37.927 4.31 1.58313 59.4
17* -40.512 (可変)
18 -70.592 1.57 1.83400 37.2
19 -35.859 2.12
20 -31.816 0.70 1.49700 81.5
21 28.356 (可変)
22 56.257 1.50 1.83400 37.2
23 56.256 (可変)
像面 ∞
(Numerical data 3)
Unit mm
Surface data Surface number rd nd ν d
1 42.393 9.21 1.59522 67.7
2 14276.464 0.20
3 * 78.681 3.00 1.58306 30.2
4 * 37.340 (variable)
5 542.237 0.80 1.90366 31.3
6 15.953 3.12 1.92286 18.9
7 43.630 2.16
8-33.449 0.80 1.72916 54.7
9 -307.398 (variable)
10 * 248.505 2.76 1.58306 30.2
11 * -47.388 2.87
12 27.010 5.91 1.49700 81.5
13 -30.856 1.00 2.00069 25.5
14 395.596 8.30
15 (Aperture) ∞ (Variable)
16 * 37.927 4.31 1.58313 59.4
17 * -40.512 (variable)
18 -70.592 1.57 1.83400 37.2
19 -35.859 2.12
20 -31.816 0.70 1.49700 81.5
21 28.356 (variable)
22 56.257 1.50 1.83400 37.2
23 56.256 (variable)
Image plane ∞
非球面データ
第3面
K = 0.00000e+000 B=-1.58481e-007 C=-8.89405e-010 D=-9.59751e-013 E= 1.20589e-015 F= 7.54320e-020
第4面
K = 0.00000e+000 B= 1.28690e-006 C= 1.48922e-010 D= 1.33427e-014 E=-3.54174e-015 F= 8.23746e-018
第10面
K = 0.00000e+000 B= 4.49190e-007 C=-1.96039e-008 D= 1.50895e-010 E=-2.13995e-012 F= 1.24480e-014
第11面
K = 0.00000e+000 B=-2.85466e-006 C=-3.07121e-009 D=-2.10960e-010 E= 1.04926e-012 F= 2.07745e-015
第16面
K = 0.00000e+000 B=-8.75539e-006 C=-8.16982e-010 D= 3.68141e-011 E=-6.46096e-013 F= 1.77711e-014
第17面
K = 0.00000e+000 B= 5.62578e-006 C= 4.44020e-009 D=-2.44573e-010 E= 3.08711e-012 F= 1.87249e-015
Aspherical data third surface
K = 0.00000e + 000 B = -1.58481e-007 C = -8.89405e-010 D = -9.59751e-013 E = 1.20589e-015 F = 7.54320e-020
4th side
K = 0.00000e + 000 B = 1.28690e-006 C = 1.48922e-010 D = 1.33427e-014 E = -3.54174e-015 F = 8.23746e-018
Side 10
K = 0.00000e + 000 B = 4.49190e-007 C = -1.96039e-008 D = 1.50895e-010 E = -2.19395e-012 F = 1.24480e-014
Page 11
K = 0.00000e + 000 B = -2.85466e-006 C = -3.07121e-009 D = -2.10960e-010 E = 1.04926e-012 F = 2.07745e-015
16th page
K = 0.00000e + 000 B = -8.75539e-006 C = -8.16982e-010 D = 3.68141e-011 E = -6.46096e-013 F = 1.77711e-014
Page 17
K = 0.00000e + 000 B = 5.62578e-006 C = 4.44020e-009 D = -2.44573e-010 E = 3.08711e-012 F = 1.87249e-015
各種データ
ズーム比 4.25
広角 中間 望遠
焦点距離 56.80 137.00 241.20
Fナンバー 4.16 5.15 5.88
半画角（度） 13.52 5.69 3.24
像高 13.66 13.66 13.66
レンズ全長 151.79 193.00 204.19
BF 38.00 52.23 65.55
d 4 8.78 49.99 61.18
d 9 25.61 14.26 1.50
d15 5.41 2.53 1.97
d17 2.87 1.60 3.72
d21 20.80 22.07 19.95
d23 38.00 52.23 65.55
ｆｎ２ -125.23
ｆｐ１ 71.42
Various data Zoom ratio 4.25
Wide-angle medium telephoto focal length 56.80 137.00 241.20
F number 4.16 5.15 5.88
Half angle of view (degrees) 13.52 5.69 3.24
Image height 13.66 13.66 13.66
Total lens length 151.79 193.00 204.19
BF 38.00 52.23 65.55
d 4 8.78 49.99 61.18
d 9 25.61 14.26 1.50
d15 5.41 2.53 1.97
d17 2.87 1.60 3.72
d21 20.80 22.07 19.95
d23 38.00 52.23 65.55
fn2 -125.23
fp1 71.42
ズームレンズ群データ
群 始面 焦点距離
1 1 140.83
2 5 -26.17
3 10 60.30
4 16 34.29
5 18 -47.59
6 22 5577.68
Zoom lens group Data group Start surface Focal length
1 1 140.83
2 5 -26.17
3 10 60.30
4 16 34.29
5 18 -47.59
6 22 5577.68
ＯＬ ズームレンズ Ｌ１ 第１レンズ群 Ｌ２ 第２レンズ群
Ｌ３ 第３レンズ群 Ｌ４ 第４レンズ群 Ｌ５ 第５レンズ群
Ｌ６ 第６レンズ群
OL zoom lens L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group L5 5th lens group L6 6th lens group
Claims (10)
前記複数のレンズ群は、物体側から像側へ順に配置された、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、負の屈折力の第５レンズ群、正の屈折力の第６レンズ群から構成され、
前記第１レンズ群は、物体側から像側へ順に配置された、正の屈折力の第１レンズ、負の屈折力の第２レンズから構成され、
前記第２レンズの材料は樹脂であり、
前記第１レンズの材料の屈折率とアッベ数を各々Ｎｄｐ１、νｄｐ１、前記第１レンズの焦点距離をｆｐ１、前記第２レンズの焦点距離をｆｎ２とするとき、
１．５＜｜ｆｎ２／ｆｐ１｜＜４．０
０．０１＜Ｎｄｐ１−（２．６２−０．０１６１×νｄｐ１）
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 a zoom lens that has multiple lens groups and an aperture diaphragm , and the distance between adjacent lens groups changes during zooming.
The plurality of lens groups are arranged 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, the third lens group having a positive refractive power, and the positive lens group. It is composed of a fourth lens group with a refractive power, a fifth lens group with a negative refractive power, and a sixth lens group with a positive refractive power.
The first lens group is composed of a first lens having a positive refractive power and a second lens having a negative refractive power arranged in order from the object side to the image side.
The material of the second lens is resin,
When the refractive index and Abbe number of the material of the first lens are Ndp1 and νpd1, the focal length of the first lens is fp1, and the focal length of the second lens is fn2, respectively.
1.5 << | fn2 / fp1 | <4.0
0.01 <Ndp1- (2.62-0.0161 × νdp1)
A zoom lens characterized by satisfying the conditional expression.
０．０１＜０．０００２５９×νｄｎ２２−０．０２６４×νｄｎ２＋２．２１３−Ｎｄｎ２
１５．０＜νｄｎ２＜６０．０
なる条件式を満足することを特徴とする請求項１乃至４のいずれか一項に記載のズームレンズ。 When the refractive index and Abbe number of the material of the second lens are Ndn2 and νdn2, respectively,
0.01 <0.000259 × νdn2 2 −0.0264 × νdn2 + 2.213-Ndn2
15.0 <νdn2 <60.0
The zoom lens according to any one of claims 1 to 4 , wherein the zoom lens satisfies the conditional expression.
０．１５≦（Ｒ２ａ−Ｒ２ｂ）／（Ｒ２ａ＋Ｒ２ｂ）≦０．５５
なる条件式を満足することを特徴とする請求項１乃至５のいずれか一項に記載のズームレンズ。 When the radii of curvature of the lens surface on the object side and the lens surface on the image side of the second lens are R2a and R2b, respectively,
0.15 ≦ (R2a-R2b) / (R2a + R2b) ≦ 0.55
The zoom lens according to any one of claims 1 to 5 , wherein the zoom lens satisfies the conditional expression.
１．５≦｜ｆｎ２／ｆｗ｜≦６．０
なる条件式を満足することを特徴とする請求項１乃至６のいずれか一項に記載のズームレンズ。 When the focal length of the entire system at the wide-angle end is fw,
1.5 ≦ | fn2 / fw | ≦ 6.0
The zoom lens according to any one of claims 1 to 6 , wherein the zoom lens satisfies the conditional expression.
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| JP2016011372A JP6808326B2 (en) | 2016-01-25 | 2016-01-25 | Zoom lens and imaging device with it |
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| JP2017134104A JP2017134104A (en) | 2017-08-03 |
| JP2017134104A5 JP2017134104A5 (en) | 2019-02-28 |
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| WO2023153076A1 (en) * | 2022-02-09 | 2023-08-17 | ソニーグループ株式会社 | Zoom lens and imaging device |
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| JPH1048525A (en) * | 1996-08-01 | 1998-02-20 | Nikon Corp | Variable power optical system |
| JPH10142474A (en) * | 1996-11-06 | 1998-05-29 | Nikon Corp | Variable power optical system |
| JP4865218B2 (en) * | 2004-12-28 | 2012-02-01 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP5462111B2 (en) * | 2010-08-24 | 2014-04-02 | パナソニック株式会社 | Zoom lens system, interchangeable lens device and camera system |
| EP3176625B1 (en) * | 2014-07-30 | 2019-09-25 | Nikon Corporation | Variable power optical system, optical device, and manufacturing method for variable power optical system |
| JP6608259B2 (en) * | 2015-12-03 | 2019-11-20 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
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