JP7504466B2 - Zoom Lens - Google Patents
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- JP7504466B2 JP7504466B2 JP2021023909A JP2021023909A JP7504466B2 JP 7504466 B2 JP7504466 B2 JP 7504466B2 JP 2021023909 A JP2021023909 A JP 2021023909A JP 2021023909 A JP2021023909 A JP 2021023909A JP 7504466 B2 JP7504466 B2 JP 7504466B2
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Description
フォーカスレンズ群が軽く高速ＡＦ制御が可能で、フォーカシング時の収差変動が抑制され、ラージフォーマットのカメラに対応可能な大口径広角ズームレンズを提供する。 To provide a large-aperture wide-angle zoom lens that has a lightweight focus lens group, enables high-speed AF control, suppresses aberration fluctuations during focusing, and is compatible with large-format cameras.
近年、レンズ交換式カメラを用いた動画撮影が一般的になってきている。動画撮影時のオートフォーカスではフォーカスレンズ群を微小駆動させてコントラストのピークを検出する、所謂コントラストＡＦを採用する場合が多い。そのため、高速なコントラストＡＦを実現するためにもフォーカスレンズ群を十分に軽くすることが求められている。 In recent years, video shooting using interchangeable lens cameras has become common. Autofocus during video shooting often employs so-called contrast AF, which moves the focus lens group slightly to detect contrast peaks. For this reason, there is a demand for the focus lens group to be sufficiently light in order to achieve high-speed contrast AF.
一眼カメラ用交換レンズとして、開放Ｆ値が明るく、広画角な大口径広角ズームレンズはズームレンズの便利さと明るい開放Ｆ値という特徴を併せ持ち、かつ広い画角を写し込めることで人気がある。また、近年はセンサーサイズが大きく画質に優れるラージフォーマットのカメラが人気であり、ラージフォーマットのカメラに対応した大口径広角ズームレンズが望まれている。 As interchangeable lenses for single-lens cameras, large-aperture wide-angle zoom lenses with a bright maximum F-number and wide angle of view are popular because they combine the convenience of a zoom lens with the characteristics of a bright maximum F-number and can capture a wide angle of view. Also, large-format cameras with large sensor sizes and excellent image quality have become popular in recent years, and there is a demand for large-aperture wide-angle zoom lenses that are compatible with large-format cameras.
広画角のズームレンズとして、負の屈折力のレンズ群が最も物体側に位置する負先行型のズームレンズが知られている。負先行型でフォーカスレンズを軽量化したズームレンズを開示している先行技術文献として、例えば以下の特許文献が挙げられる。 A known wide-angle zoom lens is a negative-lead zoom lens in which the lens group with negative refractive power is located closest to the object side. The following patent documents, for example, are examples of prior art documents that disclose negative-lead zoom lenses with lightweight focus lenses.
特許文献１に記載のズームレンズは、比較的径の小さい第２レンズ群をフォーカスレンズ群とし、１枚のレンズで構成することでフォーカス群の軽量化を達成している。しかし開放Ｆ値が暗く、また軸上色収差や像面湾曲などの諸収差の補正が不十分であるため大口径ズームレンズへの適用は困難である。 The zoom lens described in Patent Document 1 uses the second lens group, which has a relatively small diameter, as the focus lens group, and achieves a lightweight focus group by configuring it from a single lens. However, the maximum F-number is low, and correction of various aberrations such as axial chromatic aberration and curvature of field is insufficient, making it difficult to apply to large-aperture zoom lenses.
特許文献２に記載のズームレンズは、比較的径の小さい第２レンズ群をフォーカスレンズ群とし、１枚のレンズで構成することでフォーカス群の軽量化を達成するとともに、特許文献１と比べて軸上色収差や像面湾曲を改善している。しかし光学全長が長いため大口径化や、より最大像高の大きいラージフォーマットのカメラに対応させようとすると光学系が非常に大きくなってしまい現実的でない。 The zoom lens described in Patent Document 2 uses the second lens group, which has a relatively small diameter, as the focus lens group, and is constructed from a single lens, thereby achieving a lightweight focus group and improving on-axis chromatic aberration and curvature of field compared to Patent Document 1. However, because the total optical length is long, the optical system becomes very large when made compatible with larger apertures or large-format cameras with larger maximum image heights, which is not practical.
本発明はこのような状況に鑑みてなされたものであり、全長を短縮し、外径も縮小することで小型化された光学系であり、フォーカスレンズ群が軽く高速ＡＦ制御が可能で、フォーカシング時の収差変動が抑制され、ラージフォーマットのカメラに対応可能でありながら高い光学性能を有する大口径広角ズームレンズを提供することを目的とする。 The present invention was made in consideration of these circumstances, and aims to provide a large-aperture wide-angle zoom lens that has a compact optical system with a shorter overall length and smaller outer diameter, a light focus lens group that allows for high-speed AF control, suppresses aberration fluctuations during focusing, and has high optical performance while being compatible with large-format cameras.
上記課題を解決するための手段である本発明を実施のズームレンズは、物体側から順に、負の屈折力の第１レンズ群Ｇ１と３または４のレンズ群で構成されて全体で正の屈折力の中間レンズ群ＧＭと、負の屈折力の後側レンズ群ＧＲより構成され、前記中間レンズ群ＧＭは、物体側から順に、正の屈折力の第２レンズ群Ｇ２と、負の屈折力の第３レンズ群Ｇ３と、正の屈折力の第４レンズ群Ｇ４を少なくとも有し、開口絞りＳは前記第４レンズ群Ｇ４の内部または像側に配置され、広角端から望遠端への変倍に際して各群の間隔が変化し、前記第１レンズ群Ｇ１と前記第２レンズ群Ｇ２の間隔は減少し、前記中間レンズ群ＧＭと前記後側レンズ群ＧＲはそれぞれ異なる軌跡で物体側へ移動し、無限遠から近距離へのフォーカシングに際して前記第３レンズ群Ｇ３が光軸に沿って物体側へ移動し、以下の条件式（１）を満たすことを特徴とする。
（１） ２．８＜｜ｆ３｜／√（ｆｗ×ｆｔ）＜６．５
ただし、
ｆ３：前記第３レンズ群Ｇ３の焦点距離
ｆｗ：広角端、無限遠合焦状態における全系の焦点距離
ｆｔ：望遠端、無限遠合焦状態における全系の焦点距離
とする。
A zoom lens embodying the present invention, which is a means for solving the above-mentioned problems, is characterized in that, from the object side, it is composed of a first lens group G1 with negative refractive power, an intermediate lens group GM composed of three or four lens groups and having a positive refractive power as a whole, and a rear lens group GR with negative refractive power, the intermediate lens group GM has, from the object side, at least a second lens group G2 with positive refractive power, a third lens group G3 with negative refractive power, and a fourth lens group G4 with positive refractive power, an aperture stop S is disposed inside the fourth lens group G4 or on the image side thereof, a distance between each group changes during zooming from the wide-angle end to the telephoto end, a distance between the first lens group G1 and the second lens group G2 decreases, the intermediate lens group GM and the rear lens group GR move toward the object side along different trajectories, and the third lens group G3 moves toward the object side along the optical axis during focusing from infinity to a close distance, and the following conditional formula (1) is satisfied:
(1) 2.8<|f3|/√(fw×ft)<6.5
however,
f3: focal length of the third lens group G3, fw: focal length of the entire system at the wide-angle end and focused on infinity, ft: focal length of the entire system at the telephoto end and focused on infinity.
また、本発明を実施のズームレンズは、さらに以下の条件式（２）、（３）を満たすことを特徴とする。
（２） ＨＩＭ／ｆｗ＞１．０
（３） ０．９＜｜ｆ１｜／√（ｆｗ×ｆｔ）＜２．０
ただし、
ＨＩＭ：最大像高
ｆｗ：広角端、無限遠合焦状態における全系の焦点距離
ｆｔ：望遠端、無限遠合焦状態における全系の焦点距離
ｆ１：前記第１レンズ群Ｇ１の焦点距離
とする。
The zoom lens embodying the present invention is further characterized by satisfying the following conditional expressions (2) and (3).
(2) HIM/fw>1.0
(3) 0.9<|f1|/√(fw×ft)<2.0
however,
HIM: maximum image height, fw: focal length of the entire system at the wide-angle end and in the infinity focused state, ft: focal length of the entire system at the telephoto end and in the infinity focused state, f1: focal length of the first lens group G1.
また、本発明を実施のズームレンズは、さらに以下の条件式（４）を満たすことを特徴とする。
（４） １．１５＜βＲｗ＜２．０
ただし、
βＲｗ：広角端、無限遠合焦状態における前記後側レンズ群ＧＲの結像倍率
とする。
The zoom lens embodying the present invention is characterized in that it further satisfies the following conditional expression (4).
(4) 1.15<βRw<2.0
however,
βRw: the imaging magnification of the rear lens group GR at the wide-angle end and in a state where the lens is focused on an object at infinity.
また、本発明を実施のズームレンズは、さらに以下の条件式（５）を満たすことを特徴とする。
（５） ０．１０＜ＥＸＰｔ／ＬＴｔ＜０．５５
ただし、
ＥＸＰｔ：望遠端、無限遠合焦状態における像面から射出瞳までの長さ
ＬＴｔ：望遠端、無限遠合焦状態における光学系の最も物体側の面から像面までの長さ
とする。
The zoom lens embodying the present invention is characterized in that it further satisfies the following conditional expression (5).
(5) 0.10<EXPt/LTt<0.55
however,
EXPt: length from the image plane to the exit pupil at the telephoto end, in a state where the object is focused at infinity; LTt: length from the surface of the optical system closest to the object to the image plane at the telephoto end, in a state where the object is focused at infinity.
また、本発明を実施のズームレンズは、さらに前記第１レンズ群Ｇ１は広角端から望遠端への変倍に際して光軸に沿って移動して望遠端において広角端よりも像側に位置し、以下の条件式（６）を満たすことを特徴とする。
（６） βＧＭｔ＞－０．８７
ただし、
βＧＭｔ：望遠端、無限遠合焦状態における前記中間レンズ群ＧＭの結像倍率
とする。
In addition, a zoom lens embodying the present invention is further characterized in that the first lens group G1 moves along the optical axis during zooming from the wide-angle end to the telephoto end and is positioned closer to the image side at the telephoto end than the wide-angle end, and satisfies the following conditional expression (6):
(6) βGMt>-0.87
however,
βGMt: the imaging magnification of the intermediate lens group GM at the telephoto end, in a state where the lens is focused on an object at infinity.
また、本発明を実施のズームレンズは、さらに前記第３レンズ群Ｇ３は、２枚以下のレンズで構成されていることを特徴とする。 The zoom lens embodying the present invention is further characterized in that the third lens group G3 is composed of two or less lenses.
また、本発明を実施のズームレンズは、さらに広角端から望遠端への変倍に際して前記第２レンズ群Ｇ２と前記第４レンズ群Ｇ４は同じ軌跡で移動することを特徴とする。 The zoom lens embodying the present invention is further characterized in that the second lens group G2 and the fourth lens group G4 move along the same trajectory when changing magnification from the wide-angle end to the telephoto end.
本発明によれば、全長を短縮し、外径も縮小することで小型化された光学系であり、フォーカスレンズ群が軽く高速ＡＦ制御が可能で、フォーカシング時の収差変動が抑制され、ラージフォーマットのカメラに対応可能でありながら高い光学性能を有する大口径広角ズームレンズを提供することが可能となる。 The present invention provides a large-aperture, wide-angle zoom lens that has a compact optical system with a shorter overall length and smaller outer diameter, a light focus lens group that allows for high-speed AF control, suppresses aberration fluctuations during focusing, and is compatible with large-format cameras while still providing high optical performance.
以下、本発明の実施形態に係るズームレンズについて説明する。なお、以下の実施例の説明は本発明の光学系の一例を説明したものであり、本発明はその要旨を逸脱しない範囲において本実施例に限定されるものではない。 The following describes a zoom lens according to an embodiment of the present invention. Note that the following description of the embodiment is an example of the optical system of the present invention, and the present invention is not limited to this embodiment without departing from the gist of the present invention.
本発明のズームレンズは、図１、図８、図１５、図２２、図２９、図３６、図４３に示すレンズ構成図からわかるように、物体側から順に、負の屈折力の第１レンズ群Ｇ１と、三つまたは四つのレンズ群で構成されて全体で正の屈折力の中間レンズ群ＧＭと、負の屈折力の後側レンズ群ＧＲより構成され、前記中間レンズ群ＧＭは正の屈折力の第２レンズ群Ｇ２と、負の屈折力の第３レンズ群Ｇ３と、正の屈折力の第４レンズ群Ｇ４を少なくとも有し、開口絞りＳは前記第４レンズ群Ｇ４の内部または像側に配置され、広角端から望遠端への変倍に際して各群の間隔が変化し、前記第１レンズ群Ｇ１と前記第２レンズ群Ｇ２の間隔は減少し、前記中間レンズ群ＧＭと前記後側レンズ群ＧＲはそれぞれ異なる軌跡で物体側へ移動し、無限遠から近距離へのフォーカシングに際して前記第３レンズ群Ｇ３が光軸に沿って物体側へ移動する。 As can be seen from the lens configuration diagrams shown in Figures 1, 8, 15, 22, 29, 36, and 43, the zoom lens of the present invention is composed of, in order from the object side, a first lens group G1 with negative refractive power, an intermediate lens group GM composed of three or four lens groups and having a positive refractive power overall, and a rear lens group GR with negative refractive power. The intermediate lens group GM has at least a second lens group G2 with positive refractive power, a third lens group G3 with negative refractive power, and a fourth lens group G4 with positive refractive power. An aperture stop S is disposed inside or on the image side of the fourth lens group G4. When changing magnification from the wide-angle end to the telephoto end, the spacing between each group changes, the spacing between the first lens group G1 and the second lens group G2 decreases, the intermediate lens group GM and the rear lens group GR move toward the object side on different trajectories, and when focusing from infinity to a close distance, the third lens group G3 moves toward the object side along the optical axis.
広角系のズームレンズとして、負の屈折力の第１レンズ群Ｇ１と、その像側に正の屈折力のレンズ群を配置し、その間隔を広角端より望遠端で短くすることにより変倍効果を得る２群ズーム形式が用いられてきた。しかし光学系を大口径化しようとすると、収差の悪化と光学系の巨大化という問題が発生し、２群ズーム形式では自由度が不足しておりズーム全域での高性能の実現が困難である。 Wide-angle zoom lenses have traditionally used a two-group zoom format in which a first lens group G1 with negative refractive power is placed next to a lens group with positive refractive power on the image side of the first lens group G1, and the distance between them is made shorter at the telephoto end than at the wide-angle end to achieve a variable magnification effect. However, when trying to increase the aperture of the optical system, problems arise such as worsening aberrations and the optical system becoming larger, and the two-group zoom format lacks flexibility and makes it difficult to achieve high performance across the entire zoom range.
そこで本発明では、負の屈折力の第１レンズ群Ｇ１の像側に正の屈折力の中間レンズ群ＧＭと負の屈折力の後側レンズ群ＧＲを配置する構成とし、広角端から望遠端への変倍に際して中間レンズ群ＧＭと後側レンズ群ＧＲがそれぞれ異なる軌跡で物体側へ移動するようにして大口径化を可能にした。主な変倍作用は中間レンズ群ＧＭが担い、後側レンズ群ＧＲが変倍を補助することでズーム全域での高性能の実現に有利となる。また、後側レンズ群ＧＲの変倍補助作用により、変倍時の第１レンズ群Ｇ１の移動量を減らすことができ、第１レンズ群Ｇ１のカムが短くなってカム機構の自由度が高まる。特に広画角なレンズの場合、第１レンズ群Ｇ１は周辺画角の光線の通過位置が高いため外径が大きく重くなり、ここの移動量を減らせると変倍時の重量バランスの変化が少なくなって操作性も向上する。 In the present invention, therefore, a middle lens group GM with positive refractive power and a rear lens group GR with negative refractive power are arranged on the image side of the first lens group G1 with negative refractive power, and when changing magnification from the wide-angle end to the telephoto end, the middle lens group GM and the rear lens group GR move toward the object side on different trajectories, making it possible to increase the aperture. The main magnification change is performed by the middle lens group GM, and the rear lens group GR assists in the magnification change, which is advantageous for realizing high performance throughout the entire zoom range. In addition, the magnification change assistance function of the rear lens group GR makes it possible to reduce the amount of movement of the first lens group G1 during magnification change, and the cam of the first lens group G1 becomes shorter, increasing the degree of freedom of the cam mechanism. In particular, in the case of a wide-angle lens, the first lens group G1 has a large outer diameter and is heavy because the position through which light rays pass at the peripheral angle of view is high, and reducing the amount of movement here reduces the change in weight balance during magnification change and improves operability.
ここで後側レンズ群ＧＲの屈折力を負としたことには３つの利点がある。まず第１に、負の屈折力の第１レンズ群Ｇ１、正の屈折力の中間レンズ群ＧＭ、負の屈折力の後側レンズ群ＧＲという順に配置することで屈折力配置が負、正、負の対称形になり、歪曲収差や倍率色収差の抑制に効果的である。第２に、後側レンズ群ＧＲが拡大系であるため、光学系全長の短縮や第１レンズ群Ｇ１の外径の縮小が可能で小型化に有利である。第３に、後側レンズ群ＧＲで光線を跳ね上げる構成とすることで、射出瞳から像面までの長さが短くなって大口径化により周辺光束が太くなってもマウント付近の光線高を抑えることができ、マウント付近で光線がケラレにくくなる。 Here, there are three advantages to making the refractive power of the rear lens group GR negative. First, by arranging the first lens group G1 with negative refractive power, the intermediate lens group GM with positive refractive power, and the rear lens group GR with negative refractive power in that order, the refractive power arrangement becomes symmetrical with negative, positive, and negative, which is effective in suppressing distortion and chromatic aberration of magnification. Second, because the rear lens group GR is a magnifying system, it is possible to shorten the overall length of the optical system and reduce the outer diameter of the first lens group G1, which is advantageous for miniaturization. Third, by configuring the rear lens group GR to bounce up light rays, the length from the exit pupil to the image plane is shortened, and even if the peripheral light flux becomes thicker due to the large aperture, the height of the light rays near the mount can be suppressed, and light rays are less likely to be vignetted near the mount.
さらに本発明では中間レンズ群ＧＭを、物体側から順に正の屈折力の第２レンズ群Ｇ２、負の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４を少なくとも有し、開口絞りＳは前記第４レンズ群Ｇ４の内部または像側に配置され、無限遠から近距離へのフォーカシングに際して第３レンズ群Ｇ３が光軸に沿って物体側へ移動する構成とした。高速なＡＦを実現するにはフォーカスレンズ群を軽くする必要があり、そのためには光学系の中でレンズ径を小さくできる箇所にフォーカスレンズ群を配置することが好ましい。第１レンズ群Ｇ１は周辺画角の光線が高い位置を通っており、一方で中間レンズ群ＧＭのうち開口絞りＳに近い第４レンズ群Ｇ４は第１レンズ群Ｇ１で発散された軸上光束が太くなっており、いずれもレンズ径が大きくなってしまうためフォーカスレンズ群としては不適である。第１レンズ群Ｇ１と第４レンズ群Ｇ４の間であれば、周辺光線の高さは第１レンズ群Ｇ１よりも低く、また軸上マージナル光線も第４レンズ群Ｇ４より低く、レンズ径を抑えることができるため、ここにフォーカスレンズ群を配置すれば軽量なフォーカスレンズ群による高速ＡＦを実現するのに有利である。また、負の屈折力の第１レンズ群Ｇ１により発散された軸上光束は正の屈折力の第２レンズ群Ｇ２により発散が弱められ、第３レンズ群Ｇ３に入射する軸上マージナル光線が光軸に平行に近くなる。これによって第３レンズ群Ｇ３を光軸に沿って移動させたときの軸上マージナル光線高の変化が少なくなり、フォーカシング時の球面収差変動を抑えやすくなる。特に光学系を大口径化すると収差が発生しやすくなるため、フォーカシング時の収差変動を抑えやすい構成にすることが重要である。 In addition, in the present invention, the intermediate lens group GM has at least a second lens group G2 with a positive refractive power, a third lens group G3 with a negative refractive power, and a fourth lens group G4 with a positive refractive power, in that order from the object side, and the aperture diaphragm S is disposed inside or on the image side of the fourth lens group G4, and the third lens group G3 moves along the optical axis toward the object side during focusing from infinity to a close distance. In order to achieve high-speed AF, it is necessary to make the focus lens group light, and for this purpose, it is preferable to dispose the focus lens group at a location in the optical system where the lens diameter can be reduced. The first lens group G1 passes through a high position for the light rays at the peripheral angle of view, while the fourth lens group G4, which is close to the aperture diaphragm S of the intermediate lens group GM, has a thick axial light beam diverged by the first lens group G1, and both of these lens diameters become large, making them unsuitable as focus lens groups. If the focus lens group is located between the first lens group G1 and the fourth lens group G4, the height of the marginal rays is lower than that of the first lens group G1, and the axial marginal rays are also lower than that of the fourth lens group G4, so that the lens diameter can be reduced. Therefore, if the focus lens group is located here, it is advantageous to realize high-speed AF using a lightweight focus lens group. In addition, the axial light flux diverged by the first lens group G1 with negative refractive power is weakened by the second lens group G2 with positive refractive power, and the axial marginal rays incident on the third lens group G3 become closer to parallel to the optical axis. This reduces the change in the height of the axial marginal rays when the third lens group G3 is moved along the optical axis, making it easier to suppress spherical aberration fluctuations during focusing. In particular, since aberrations are more likely to occur when the optical system is made larger in diameter, it is important to have a configuration that makes it easier to suppress aberration fluctuations during focusing.
また、開口絞りＳは第４レンズ群Ｇ４の内部または像側に配置することが望ましい。開口絞りＳの物体側に正の屈折力の第４レンズ群Ｇ４の全体または一部が配置されることで、負の屈折力の第３レンズ群Ｇ３により発散された軸上光束を収斂させ、開口絞りＳの径を下げることができる。これにより製品外径の縮小に有利となる。 It is also desirable to place the aperture stop S inside the fourth lens group G4 or on the image side. By placing all or part of the fourth lens group G4 with positive refractive power on the object side of the aperture stop S, the axial light beam diverged by the third lens group G3 with negative refractive power can be converged, and the diameter of the aperture stop S can be reduced. This is advantageous for reducing the outer diameter of the product.
上記構成において高性能なズームレンズを実現するためには以下の条件式（１）を満足することが望ましい。
（１） ２．８＜｜ｆ３｜／√（ｆｗ×ｆｔ）＜６．５
ただし、
ｆ３：前記第３レンズ群Ｇ３の焦点距離
ｆｗ：広角端、無限遠合焦状態における全系の焦点距離
ｆｔ：望遠端、無限遠合焦状態における全系の焦点距離
とする。
In order to realize a high-performance zoom lens with the above configuration, it is desirable to satisfy the following conditional expression (1).
(1) 2.8<|f3|/√(fw×ft)<6.5
however,
f3: focal length of the third lens group G3, fw: focal length of the entire system at the wide-angle end and focused on infinity, ft: focal length of the entire system at the telephoto end and focused on infinity.
条件式（１）は、フォーカスレンズ群である第３レンズ群Ｇ３の屈折力について好ましい範囲を規定するものである。条件式（１）を満たすことにより、光学系の大型化を抑えつつフォーカシング時の移動量や収差変動を抑制することができる。 Conditional expression (1) defines a preferred range for the refractive power of the third lens group G3, which is a focus lens group. By satisfying conditional expression (1), it is possible to suppress the amount of movement and aberration fluctuation during focusing while preventing the optical system from becoming large.
条件式（１）の上限を超え、第３レンズ群Ｇ３の屈折力が弱まると、無限遠から近距離への合焦時の第３レンズ群Ｇ３の移動量が増え、光学系全長の短縮が難しくなる。一方、条件式（１）の下限を超え、第３レンズ群Ｇ３の屈折力が強まると、無限遠から近距離への合焦の際の収差変動が大きくなる。また、製造誤差敏感度も悪化する。特に光学系を大口径化すると収差変動が悪化しやすいため、収差変動を抑制できるように適切な屈折力配置に設定することが重要である。 If the upper limit of conditional expression (1) is exceeded and the refractive power of the third lens group G3 is weakened, the amount of movement of the third lens group G3 when focusing from infinity to a close distance increases, making it difficult to shorten the overall length of the optical system. On the other hand, if the lower limit of conditional expression (1) is exceeded and the refractive power of the third lens group G3 is strong, the aberration fluctuation when focusing from infinity to a close distance increases. In addition, the sensitivity to manufacturing errors also worsens. In particular, since aberration fluctuation is likely to worsen when the diameter of the optical system is increased, it is important to set an appropriate refractive power arrangement so that aberration fluctuation can be suppressed.
また、上述した条件式（１）について、その下限値を２．９に、また、上限値を６．０に限定することで、前述の効果をより確実にできるため好ましい。 Furthermore, it is preferable to limit the lower limit of the above-mentioned conditional formula (1) to 2.9 and the upper limit to 6.0, since this makes it possible to more reliably achieve the above-mentioned effects.
さらに本発明のズームレンズでは、以下に示す条件式（２）、（３）を満たすことが望ましい。
（２） ＨＩＭ／ｆｗ＞１．０
（３） ０．９＜｜ｆ１｜／√（ｆｗ×ｆｔ）＜２．０
ただし、
ＨＩＭ：最大像高
ｆｗ：広角端、無限遠合焦状態における全系の焦点距離
ｆｔ：望遠端、無限遠合焦状態における全系の焦点距離
ｆ１：前記第１レンズ群Ｇ１の焦点距離
とする。
Furthermore, in the zoom lens of the present invention, it is desirable to satisfy the following conditional expressions (2) and (3).
(2) HIM/fw>1.0
(3) 0.9<|f1|/√(fw×ft)<2.0
however,
HIM: maximum image height, fw: focal length of the entire system at the wide-angle end and in the infinity focused state, ft: focal length of the entire system at the telephoto end and in the infinity focused state, f1: focal length of the first lens group G1.
条件式（２）は、本発明のズームレンズが広角端において一定以上の広画角であることを規定し、後述する条件式（３）を満たすことにより実現可能となるものである。 Conditional expression (2) stipulates that the zoom lens of the present invention must have a certain or greater wide angle of view at the wide-angle end, and this can be realized by satisfying conditional expression (3) described below.
条件式（３）は第１レンズ群Ｇ１の屈折力に関して好ましい条件を規定するものである。条件式（３）を満たすことにより、光学全長や諸収差を抑制しつつ光学系の大口径化及び広画角化が可能となる。 Conditional expression (3) defines a preferable condition regarding the refractive power of the first lens group G1. By satisfying conditional expression (3), it is possible to increase the aperture and widen the angle of view of the optical system while suppressing the total optical length and various aberrations.
条件式（３）の上限を超え、第１レンズ群Ｇ１の屈折力が弱まると、広画角化が困難になる。第１レンズ群Ｇ１の屈折力が弱い状態で広画角化するには第２レンズ群Ｇ２以降の合成系の結像倍率の絶対値を小さくしなければならず、そのためには第１レンズ群Ｇ１と第２レンズ群Ｇ２以降の合成系の間隔を広げる方法と第２レンズ群Ｇ２以降の合成系の正の屈折力を強くする方法が考えられる。しかし前者は光学系全長の短縮が困難になり、後者は倍率色収差が悪化し高結像性能の実現が困難になる。また、バックフォーカスの確保も難しくなる。一方、条件式（３）の下限を超え、第１レンズ群Ｇ１の屈折力が強まると、第１レンズ群Ｇ１による軸上光束の発散作用が強まり、特に望遠端において第２レンズ群Ｇ２以降の群の径が高くなって製品外径の肥大化を招いてしまう。また、フォーカスレンズ群である第３レンズ群Ｇ３の径も大きくなることでフォーカスレンズ群が重くなり、高速ＡＦの実現に不利になってしまい好ましくない。更に、第２レンズ群Ｇ２以降の合成系の倍率負担も大きくなるので、第１レンズ群Ｇ１の残存収差が拡大されて全系の収差補正が加速度的に困難になる。 If the upper limit of conditional formula (3) is exceeded and the refractive power of the first lens group G1 is weakened, it becomes difficult to achieve a wide angle of view. In order to achieve a wide angle of view when the refractive power of the first lens group G1 is weak, the absolute value of the image-forming magnification of the composite system after the second lens group G2 must be reduced. To achieve this, the distance between the first lens group G1 and the composite system after the second lens group G2 and the positive refractive power of the composite system after the second lens group G2 can be increased, and the former method makes it difficult to shorten the total length of the optical system, and the latter method makes it difficult to achieve high imaging performance due to the deterioration of chromatic aberration of magnification. It also becomes difficult to ensure the back focus. On the other hand, if the lower limit of conditional formula (3) is exceeded and the refractive power of the first lens group G1 is strengthened, the divergence effect of the axial light beam by the first lens group G1 becomes stronger, and the diameter of the group after the second lens group G2 becomes larger, especially at the telephoto end, resulting in an increase in the outer diameter of the product. In addition, the diameter of the third lens group G3, which is the focus lens group, also becomes larger, making the focus lens group heavier, which is undesirable as it is detrimental to achieving high-speed AF. Furthermore, the magnification burden of the composite system from the second lens group G2 onwards also increases, so the residual aberration of the first lens group G1 is magnified, making it increasingly difficult to correct aberrations in the entire system.
また、上述した条件式（３）について、その下限値を１．０に、また、上限値を１．８に限定することで、前述の効果をより確実にできるため好ましい。 Furthermore, it is preferable to limit the lower limit of the above-mentioned conditional formula (3) to 1.0 and the upper limit to 1.8, since this makes it possible to more reliably achieve the above-mentioned effect.
さらに本発明のズームレンズでは、以下に示す条件式（４）を満たすことが望ましい。
（４） １．１５＜βＲｗ＜２．００
ただし、
βＲｗ：広角端、無限遠合焦状態における後側レンズ群ＧＲの結像倍率
とする。
Furthermore, in the zoom lens of the present invention, it is desirable to satisfy the following conditional expression (4).
(4) 1.15<βRw<2.00
however,
βRw: the imaging magnification of the rear lens group GR at the wide-angle end and in a state where the lens is focused on an object at infinity.
条件式（４）は広角端、無限遠合焦状態における後側レンズ群ＧＲの結像倍率に関して好ましい条件を規定するものである。条件式（４）を満たすことにより、高結像性能かつ高速ＡＦを実現可能となるほか、バックフォーカスを確保しやすくなる。また、後側レンズ群ＧＲは拡大系であるため、全系の小型化を実現することが可能となる。 Conditional formula (4) specifies the preferable conditions for the imaging magnification of the rear lens group GR at the wide-angle end and in the infinity focused state. By satisfying conditional formula (4), it is possible to achieve high imaging performance and high-speed AF, and it is also easy to ensure back focus. In addition, because the rear lens group GR is a magnification system, it is possible to realize a compact overall system.
条件式（４）の上限を超え、広角端、無限遠合焦状態における後側レンズ群ＧＲの結像倍率が大きくなると、広角端においてフォーカシングの際に第３レンズ群Ｇ３を光軸に沿って移動させたときの収差変動が後側レンズ群ＧＲでより大きく拡大されてしまい好ましくない。特に高速ＡＦを実現するためにフォーカスレンズ群の枚数を減らすとフォーカスレンズ群を光軸に沿って動かしたときの収差変動が大きくなるため、無限遠から近距離までのフォーカス全域にわたって高結像性能を実現するためには後側レンズ群ＧＲの倍率を小さくする必要がある。一方、条件式（４）の下限を超え、広角端、無限遠合焦状態における後側レンズ群ＧＲの結像倍率が小さくなると、バックフォーカスの確保が困難になる。また、後側レンズ群ＧＲの拡大系の効果が弱まって全系の小型化が難しくなる。 If the upper limit of conditional expression (4) is exceeded and the imaging magnification of the rear lens group GR at the wide-angle end and in the infinity focused state becomes large, the aberration fluctuation when the third lens group G3 is moved along the optical axis during focusing at the wide-angle end is magnified more in the rear lens group GR, which is undesirable. In particular, if the number of focus lens groups is reduced to achieve high-speed AF, the aberration fluctuation when the focus lens group is moved along the optical axis becomes large, so in order to achieve high imaging performance over the entire focus range from infinity to close distances, it is necessary to reduce the magnification of the rear lens group GR. On the other hand, if the lower limit of conditional expression (4) is exceeded and the imaging magnification of the rear lens group GR at the wide-angle end and in the infinity focused state becomes small, it becomes difficult to ensure the back focus. In addition, the effect of the magnification system of the rear lens group GR is weakened, making it difficult to reduce the size of the entire system.
また、上述した条件式（４）について、その下限値を１．２０に、また、上限値を１．８０に限定することで、前述の効果をより確実にできるため好ましい。 Furthermore, it is preferable to limit the lower limit of the above-mentioned conditional formula (4) to 1.20 and the upper limit to 1.80, since this makes it possible to more reliably achieve the above-mentioned effect.
さらに本発明のズームレンズでは、以下に示す条件式（５）を満たすことが望ましい。
（５） ０．１０＜ＥＸＰｔ／ＬＴｔ＜０．５５
ただし、
ＥＸＰｔ：望遠端、無限遠合焦状態における像面から射出瞳までの長さ
ＬＴｔ：望遠端、無限遠合焦状態における光学系の最も物体側の面から像面までの長さ
とする。
Furthermore, in the zoom lens of the present invention, it is desirable to satisfy the following condition (5).
(5) 0.10<EXPt/LTt<0.55
however,
EXPt: length from the image plane to the exit pupil at the telephoto end, in a state where the object is focused at infinity; LTt: length from the surface of the optical system closest to the object to the image plane at the telephoto end, in a state where the object is focused at infinity.
条件式（５）は望遠端、無限遠合焦状態における像面から射出瞳までの長さと光学系全長の比に関して好ましい条件を規定するものである。条件式（５）を満たすことにより、カメラのマウント付近や撮像素子の受光部などで光線がケラレにくくなる。特に大口径化すると光束が太くなって光線がケラレやすくなるため像面から射出瞳までの長さを適切に設定することが重要である。 Conditional formula (5) specifies the preferable condition for the ratio of the length from the image plane to the exit pupil to the overall length of the optical system when the lens is at the telephoto end and focused at infinity. By satisfying conditional formula (5), light rays are less likely to be vignetted near the camera mount or the light receiving section of the image sensor. In particular, as the aperture becomes larger, the light beam becomes thicker and light rays are more likely to be vignetted, so it is important to set the length from the image plane to the exit pupil appropriately.
条件式（５）の上限を超え、像面から射出瞳までの長さが長くなると、周辺画角の光線の像面への入射角が小さくなることでマウント付近での光線通過高さが高くなるためマウント付近で光線がケラレやすくなり、周辺光量の確保が困難になる。一方、条件式（５）の下限を超え、像面から射出瞳までの長さが短くなると、周辺画角の光線の像面への入射角が大きくなることで撮像素子の受光部で光線がケラレやすくなる。また、絞りより物体側の面において主光線通過位置が高くなることで下光線が通りにくくなって周辺光量低下が大きくなり、口径食も悪化する。 If the upper limit of conditional formula (5) is exceeded and the length from the image plane to the exit pupil becomes long, the angle of incidence of light rays at the peripheral angle of view on the image plane becomes smaller, which increases the height at which the light rays pass near the mount, making it easier for the light rays to be vignetted near the mount and making it difficult to ensure peripheral illumination. On the other hand, if the lower limit of conditional formula (5) is exceeded and the length from the image plane to the exit pupil becomes short, the angle of incidence of light rays at the peripheral angle of view on the image plane becomes larger, making it easier for the light rays to be vignetted at the light receiving section of the image sensor. In addition, the position at which the chief ray passes becomes higher on the surface closer to the object than the aperture, making it harder for the lower light rays to pass, resulting in greater peripheral illumination loss and worsening vignetting.
また、上述した条件式（５）について、その下限値を０．２０に、また、上限値を０．５０に限定することで、前述の効果をより確実にできるため好ましい。 Furthermore, it is preferable to limit the lower limit of the above-mentioned conditional expression (5) to 0.20 and the upper limit to 0.50, since this makes it possible to more reliably achieve the above-mentioned effect.
さらに本発明のズームレンズでは、第１レンズ群Ｇ１は広角端から望遠端への変倍に際して光軸に沿って移動して望遠端において広角端よりも像側に位置し、以下の条件式（６）を満たすことが望ましい。
（６） βＧＭｔ＞－０．８７
ただし、
βＧＭｔ：望遠端、無限遠合焦状態における前記中間レンズ群ＧＭの結像倍率
とする。
Furthermore, in the zoom lens of the present invention, it is desirable that the first lens group G1 moves along the optical axis during zooming from the wide-angle end to the telephoto end and is positioned closer to the image side at the telephoto end than at the wide-angle end, and that the following conditional expression (6) be satisfied:
(6) βGMt>-0.87
however,
βGMt: the imaging magnification of the intermediate lens group GM at the telephoto end, in a state where the lens is focused on an object at infinity.
条件式（６）は望遠端、無限遠合焦状態における中間レンズ群ＧＭの結像倍率に関して好ましい条件を規定するものである。条件式（６）を満たすことにより、製品外径を抑えつつ高性能化、大口径化が可能となる。 Conditional expression (6) specifies the preferable condition for the imaging magnification of the intermediate lens group GM at the telephoto end, when focused on infinity. By satisfying conditional expression (6), it is possible to achieve high performance and a large aperture while keeping the outer diameter of the product small.
ここで、物体側から順に負正２群ズームは、像側の正屈折力の群（正群）の結像倍率が等倍になるときに物体側の負の屈折力の群（負群）が最も像面に近づき、正群が等倍になる位置を境に変倍時の負群の軌跡はＵターンする。一方で正群は広角端から望遠端への変倍時に物体側へ単調に移動する。 Here, in a negative-positive two-group zoom, starting from the object side, the group with negative refractive power on the object side (negative group) is closest to the image plane when the imaging magnification of the group with positive refractive power on the image side (positive group) becomes 1x, and the trajectory of the negative group when changing magnification makes a U-turn at the point where the positive group becomes 1x. On the other hand, the positive group moves monotonically toward the object side when changing magnification from the wide-angle end to the telephoto end.
そこで、本発明のズームレンズは、全体として正の屈折力である中間レンズ群ＧＭが広角端から望遠端への変倍に際して第１レンズ群Ｇ１に接近することで主な変倍作用を担い、その像面側のレンズ群が変倍を補助する構成となっている。主たる変倍作用のみに着目すれば、第１レンズ群Ｇ１と中間レンズ群ＧＭの負正２群ズーム形式と見なすことができる。 The zoom lens of the present invention is configured so that the intermediate lens group GM, which has a positive refractive power overall, performs the main zooming function by approaching the first lens group G1 when zooming from the wide-angle end to the telephoto end, and the lens group on the image side assists in zooming. If we focus only on the main zooming function, the first lens group G1 and the intermediate lens group GM can be considered to be a negative-positive two-group zoom format.
条件式（６）の下限を超え、望遠端、無限遠合焦状態における中間レンズ群ＧＭの結像倍率が等倍に近づく、さらには等倍を超えると、中間レンズ群ＧＭの変倍時の移動量が大きく、また望遠端での軸上光束が太くなり、製品外径の肥大化を招く。また第１レンズ群Ｇ１の残存収差を打ち消すための中間レンズ群ＧＭの収差補正量が増え、さらに中間レンズ群ＧＭの見掛けのＦ値が小さくなることによる中間レンズ群ＧＭ自身の残存収差の補正が困難になるため、レンズ枚数を増やさなければ全系の収差補正が困難になる。これらより、望遠端における中間レンズ群ＧＭの結像倍率が等倍に近づかないようにし、望遠端において第１レンズ群Ｇ１を広角端よりも像側に位置させることで、製品外径の縮小、高性能化、大口径化に有利となる。 If the lower limit of conditional expression (6) is exceeded and the imaging magnification of the intermediate lens group GM at the telephoto end and in the infinity focused state approaches life-size or even exceeds life-size, the amount of movement of the intermediate lens group GM during magnification change becomes large, and the axial light beam at the telephoto end becomes thicker, leading to an increase in the product outer diameter. In addition, the amount of aberration correction of the intermediate lens group GM to cancel the residual aberration of the first lens group G1 increases, and the apparent F-number of the intermediate lens group GM becomes smaller, making it difficult to correct the residual aberration of the intermediate lens group GM itself, so that it becomes difficult to correct the aberration of the entire system unless the number of lenses is increased. As a result, by preventing the imaging magnification of the intermediate lens group GM at the telephoto end from approaching life-size and positioning the first lens group G1 at the telephoto end closer to the image side than the wide-angle end, it is advantageous for reducing the product outer diameter, improving performance, and increasing the aperture.
また、上述した条件式（６）について、その下限値を－０．８３に限定することで、前述の効果をより確実にできるため好ましい。 Furthermore, it is preferable to set the lower limit of the above-mentioned conditional expression (6) to -0.83, since this makes it possible to more reliably achieve the above-mentioned effect.
さらに本発明のズームレンズでは、第３レンズ群Ｇ３は２枚以下のレンズで構成されていることが望ましい。 Furthermore, in the zoom lens of the present invention, it is preferable that the third lens group G3 is composed of two or less lenses.
フォーカスレンズ群である第３レンズ群Ｇ３の枚数を２枚以下に抑制することには２つの効果がある。第１の効果として、レンズ枚数の抑制によりフォーカスレンズ群を軽量化でき、高速ＡＦに有利となる。第２の効果として、構成枚数が減ることでフォーカスレンズ群の光軸方向の厚みが抑制され、無限遠から近距離にかけてフォーカスレンズ群が移動する空間を広く確保することができる。これによりフォーカスレンズ群の屈折力を弱めることができ、製造誤差敏感度の抑えられたフォーカスレンズ群を実現できる。 Limiting the number of lenses in the third lens group G3, which is the focus lens group, to two or less has two effects. First, limiting the number of lenses makes it possible to reduce the weight of the focus lens group, which is advantageous for high-speed AF. Second, reducing the number of lenses reduces the thickness of the focus lens group in the optical axis direction, ensuring a wide space for the focus lens group to move from infinity to close distances. This weakens the refractive power of the focus lens group, resulting in a focus lens group with reduced sensitivity to manufacturing errors.
さらに本発明のズームレンズでは、広角端から望遠端への変倍に際して第２レンズ群Ｇ２と第４レンズ群Ｇ４が同じ軌跡で移動することが望ましい。これによりカム機構を単純化し、フォーカシング時に第３レンズ群Ｇ３を駆動するためのフォーカスモーターを配置しやすくなる。 Furthermore, in the zoom lens of the present invention, it is desirable that the second lens group G2 and the fourth lens group G4 move on the same trajectory when changing magnification from the wide-angle end to the telephoto end. This simplifies the cam mechanism and makes it easier to position a focus motor to drive the third lens group G3 during focusing.
また、フォーカスレンズ群である第３レンズ群Ｇ３が凹レンズ１枚で構成される場合、そのどちらかの面に回折光学素子を設けてもよい。これによりフォーカシング時の軸上色収差の変動を抑制することができ、無限遠から近距離までのフォーカス全域にわたって軸上色収差が良好に補正されたズームレンズを実現できる。 In addition, if the third lens group G3, which is the focus lens group, is composed of a single concave lens, a diffractive optical element may be provided on one of its surfaces. This makes it possible to suppress fluctuations in axial chromatic aberration during focusing, and realizes a zoom lens in which axial chromatic aberration is well corrected over the entire focus range from infinity to close distances.
次に、本発明のズームレンズに係る実施例のレンズ構成について説明する。
なお、以下の説明ではレンズ構成を物体側から像側の順番で記載する。
Next, the lens configuration of an embodiment of the zoom lens of the present invention will be described.
In the following description, the lens configuration will be described in order from the object side to the image side.
［面データ］において、面番号は物体側から数えたレンズ面又は開口絞りＳの番号、ｒは各面の曲率半径、ｄは各面の間隔、ｎｄはｄ線（波長λ＝５８７．５６ｎｍ）に対する屈折率、νｄはｄ線に対するアッベ数を示す。またＢＦはバックフォーカスを表す。 In [Surface Data], the surface number is the number of the lens surface or aperture stop S counted from the object side, r is the radius of curvature of each surface, d is the distance between each surface, nd is the refractive index for the d line (wavelength λ=587.56 nm), and νd is the Abbe number for the d line. Also, BF represents the back focus.
面番号に付した＊（アスタリスク）は、そのレンズ面形状が非球面であることを示している。また、ＢＦはバックフォーカス、物面の距離は被写体からレンズ第１面までの距離を示している。 An asterisk (*) next to a surface number indicates that the lens surface is aspheric. BF is the back focus, and the object surface distance is the distance from the subject to the first lens surface.
面番号に付した（絞り）は、その位置に開口絞りＳが位置していることを示している。平面又は開口絞りＳに対する曲率半径には∞（無限大）を記入している。 The (Aperture) next to a surface number indicates that an aperture diaphragm S is located at that position. The radius of curvature for the plane or aperture diaphragm S is marked as ∞ (infinity).
［非球面データ］には、［面データ］において＊を付したレンズ面の非球面形状を与える各係数の値を示している。非球面の形状は、下記の式で表される。以下の式において、光軸に直交する方向への光軸からの変位をｙ、非球面との光軸の交点から光軸方向への変位（ザグ量）をｚ、基準球面の曲率半径をｒ、コーニック係数をＫで表している。また、４、６、８、１０、１２次の非球面係数をそれぞれＡ４、Ａ６、Ａ８、Ａ１０、Ａ１２で表している。
［各種データ］には、各撮影距離合焦状態における焦点距離等の値を示している。 [Various Data] shows values such as focal length at each shooting distance and focus state.
［可変間隔データ］には、各種撮影距離合焦状態における可変間隔およびＢＦの値を示している。 [Variable Distance Data] shows the variable distance and BF values for various shooting distance focus states.
［レンズ群データ］には、各レンズ群を構成する最も物体側の面番号および群全体の合成焦点距離を示している。 [Lens group data] shows the surface number of each lens group closest to the object and the composite focal length of the entire group.
また、各実施例に対応する収差図において、ｄ、ｇ、Ｃはそれぞれｄ線、ｇ線、Ｃ線を表しており、ΔＳ、ΔＭはそれぞれサジタル像面、メリジオナル像面を表している。なお、以下のすべての諸元の値において、記載している焦点距離ｆ，曲率半径ｒ，レンズ面間隔ｄ，その他の長さの単位は特記のない限りミリメートル（ｍｍ）を使用するが、光学系では比例拡大と比例縮小においても同様の光学性能が得られるので、これに限られるものではない。 In the aberration diagrams corresponding to each embodiment, d, g, and C represent the d-line, g-line, and C-line, respectively, and ΔS and ΔM represent the sagittal image surface and meridional image surface, respectively. Note that in all the values of the following specifications, the focal length f, radius of curvature r, lens surface spacing d, and other length units are given in millimeters (mm) unless otherwise specified, but this is not limited to this because the optical system can obtain similar optical performance with proportional enlargement and proportional reduction.
図１は、本発明の実施例１のズームレンズのレンズ構成図である。 Figure 1 is a lens configuration diagram of a zoom lens according to a first embodiment of the present invention.
負の屈折力の第１レンズ群Ｇ１、正の屈折力の第２レンズ群Ｇ２、負の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、負の屈折力の第５レンズ群Ｇ５より構成され、広角端から望遠端への変倍に際して各群の間隔が変化し、第１レンズ群Ｇ１は像側へ移動し、第２レンズ群Ｇ２から第５レンズ群Ｇ５の各群はいずれも物体側へ移動する構成となっている。開口絞りＳは第４レンズ群Ｇ４の内部に備えられ、変倍の際には第４レンズ群Ｇ４と一体で移動する。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３レンズ群Ｇ３が光軸に沿って物体側へ移動する。本実施例において、正の屈折力の中間レンズ群ＧＭは第２レンズ群Ｇ２と第３レンズ群Ｇ３と第４レンズ群Ｇ４より構成され、負の屈折力の後側レンズ群ＧＲは第５レンズ群Ｇ５に相当する。 It is composed of a first lens group G1 with negative refractive power, a second lens group G2 with positive refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with negative refractive power. When changing the magnification from the wide-angle end to the telephoto end, the interval between each group changes, the first lens group G1 moves toward the image side, and each group from the second lens group G2 to the fifth lens group G5 moves toward the object side. The aperture stop S is provided inside the fourth lens group G4, and moves together with the fourth lens group G4 during the magnification change. When focusing from an object at infinity to an object at a close distance, the third lens group G3 moves toward the object side along the optical axis. In this embodiment, the middle lens group GM with positive refractive power is composed of the second lens group G2, the third lens group G3, and the fourth lens group G4, and the rear lens group GR with negative refractive power corresponds to the fifth lens group G5.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と、物体側に凸面を向けた負メニスカスレンズＬ２と、物体側に凸面を向けた負メニスカスレンズＬ３と、物体側に凸面を向けた正メニスカスレンズＬ４より構成される。負メニスカスレンズＬ１の両面と、負メニスカスレンズＬ２の両面は所定の非球面形状となっている。 The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a negative meniscus lens L2 with a convex surface facing the object side, a negative meniscus lens L3 with a convex surface facing the object side, and a positive meniscus lens L4 with a convex surface facing the object side. Both surfaces of the negative meniscus lens L1 and both surfaces of the negative meniscus lens L2 have a predetermined aspheric shape.
第２レンズ群Ｇ２は、物体側に凸面を向けた正メニスカスレンズＬ５より構成される。 The second lens group G2 is composed of a positive meniscus lens L5 with its convex surface facing the object side.
第３レンズ群Ｇ３は、両凹レンズＬ６より構成される。 The third lens group G3 is composed of a biconcave lens L6.
第４レンズ群Ｇ４は、両凸レンズＬ７と、物体側に凸面を向けた負メニスカスレンズＬ８と両凸レンズＬ９からなる接合レンズと、開口絞りＳと、物体側に凸面を向けた正メニスカスレンズＬ１０と、両凸レンズＬ１１と、物体側に凹面を向けた正メニスカスレンズＬ１２と物体側に凹面を向けた負メニスカスレンズＬ１３からなる接合レンズより構成される。両凸レンズＬ７の両面は所定の非球面形状となっている。 The fourth lens group G4 is composed of a biconvex lens L7, a cemented lens consisting of a negative meniscus lens L8 with its convex surface facing the object side and a biconvex lens L9, an aperture stop S, a cemented lens consisting of a positive meniscus lens L10 with its convex surface facing the object side, a biconvex lens L11, a positive meniscus lens L12 with its concave surface facing the object side, and a negative meniscus lens L13 with its concave surface facing the object side. Both surfaces of the biconvex lens L7 have a predetermined aspheric shape.
第５レンズ群Ｇ５は、両凹レンズＬ１４と物体側に凸面を向けた正メニスカスレンズＬ１５からなる接合レンズと、両凸レンズＬ１６と、両凹レンズＬ１７より構成される。両凹レンズＬ１７の両面は所定の非球面形状となっている。 The fifth lens group G5 is composed of a cemented lens consisting of a biconcave lens L14 and a positive meniscus lens L15 with its convex surface facing the object side, a biconvex lens L16, and a biconcave lens L17. Both surfaces of the biconcave lens L17 have a predetermined aspheric shape.
以下に実施例１に係るズームレンズの諸元値を示す。
数値実施例1
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1* 92.0992 3.1050 1.69350 53.20
2* 22.3758 13.8514
3* 299.9924 2.2000 1.59201 67.02
4* 43.3959 6.5227
5 1825.8707 1.8000 1.55032 75.50
6 58.9545 0.1500
7 42.5765 3.6727 1.92119 23.96
8 83.9076 (d8)
9 51.5699 2.4585 1.80610 33.27
10 121.1049 (d10)
11 -55.5797 1.0000 1.61340 44.27
12 754.1173 (d12)
13* 58.9921 7.1591 1.85135 40.10
14* -66.7258 0.1500
15 3281.8786 1.0000 1.90043 37.37
16 31.2398 8.1721 1.59282 68.62
17 -137.9176 1.9336
18(絞り) ∞ 5.2862
19 56.0400 3.7771 1.49700 81.61
20 298.4343 0.1500
21 61.2506 7.8942 1.43700 95.10
22 -44.1222 0.1500
23 -156.3931 5.6847 1.55032 75.50
24 -28.1588 1.0000 1.90366 31.32
25 -50.9023 (d25)
26 -54.2581 1.0000 1.80809 22.76
27 25.7530 6.6926 1.55032 75.50
28 69.5100 0.1500
29 38.8898 5.3376 1.92286 20.88
30 -41.2205 0.1500
31* -297.0541 1.2000 1.80610 40.73
32* 32.1116 (BF)
像面 ∞
[非球面データ]
1面 2面 3面 4面
K 0.00000 -0.54499 0.00000 0.00000
A4 4.60815E-06 4.74173E-06 -7.22015E-09 5.93522E-06
A6 -6.70234E-09 6.01116E-10 1.22804E-09 2.37475E-09
A8 5.32648E-12 -8.20569E-12 -2.23572E-12 1.55708E-11
A10 -2.25277E-15 -1.49623E-14 0.00000E+00 1.66882E-14
A12 4.42797E-19 0.00000E+00 0.00000E+00 0.00000E+00
13面 14面 31面 32面
K 0.00000 0.00000 0.00000 0.00000
A4 -4.93542E-06 1.59431E-07 -7.83067E-06 1.33688E-05
A6 -1.41023E-09 -1.70059E-09 -5.35569E-08 -2.85627E-08
A8 -1.48656E-12 -2.33061E-13 5.33567E-11 1.52788E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[各種データ]
ズーム比 1.54
広角 中間 望遠
焦点距離 17.55 21.66 27.10
Fナンバー 1.86 1.86 1.86
全画角2ω 105.33 89.54 74.48
像高Y 21.63 21.63 21.63
レンズ全長 158.61 150.53 144.72
[可変間隔データ]
広角 中間 望遠
d8 27.3380 14.7730 3.5000
d10 10.3161 10.4491 10.4396
d12 2.6330 2.5000 2.5095
d25 1.9333 3.5713 6.1219
BF 24.7396 27.5879 30.5018
[レンズ群データ]
群 始面 焦点距離
G1 1 -27.54
G2 9 109.69
G3 11 -84.35
G4 13 28.74
G5 26 -76.45
The specifications of the zoom lens according to the first embodiment are shown below.
Numerical Example 1
Unit: mm
[Face data]
Surface number rd nd vd
Object surface ∞ (d0)
1* 92.0992 3.1050 1.69350 53.20
2* 22.3758 13.8514
3* 299.9924 2.2000 1.59201 67.02
4* 43.3959 6.5227
5 1825.8707 1.8000 1.55032 75.50
6 58.9545 0.1500
7 42.5765 3.6727 1.92119 23.96
8 83.9076 (d8)
9 51.5699 2.4585 1.80610 33.27
10 121.1049 (d10)
11 -55.5797 1.0000 1.61340 44.27
12 754.1173 (d12)
13* 58.9921 7.1591 1.85135 40.10
14* -66.7258 0.1500
15 3281.8786 1.0000 1.90043 37.37
16 31.2398 8.1721 1.59282 68.62
17 -137.9176 1.9336
18(Aperture) ∞ 5.2862
19 56.0400 3.7771 1.49700 81.61
20 298.4343 0.1500
21 61.2506 7.8942 1.43700 95.10
22 -44.1222 0.1500
23 -156.3931 5.6847 1.55032 75.50
24 -28.1588 1.0000 1.90366 31.32
25 -50.9023 (d25)
26 -54.2581 1.0000 1.80809 22.76
27 25.7530 6.6926 1.55032 75.50
28 69.5100 0.1500
29 38.8898 5.3376 1.92286 20.88
30 -41.2205 0.1500
31* -297.0541 1.2000 1.80610 40.73
32* 32.1116 (BF)
Image plane ∞
[Aspheric data]
Side 1 Side 2 Side 3 Side 4
K 0.00000 -0.54499 0.00000 0.00000
A4 4.60815E-06 4.74173E-06 -7.22015E-09 5.93522E-06
A6 -6.70234E-09 6.01116E-10 1.22804E-09 2.37475E-09
A8 5.32648E-12 -8.20569E-12 -2.23572E-12 1.55708E-11
A10 -2.25277E-15 -1.49623E-14 0.00000E+00 1.66882E-14
A12 4.42797E-19 0.00000E+00 0.00000E+00 0.00000E+00
13th 14th 31st 32nd
K 0.00000 0.00000 0.00000 0.00000
A4 -4.93542E-06 1.59431E-07 -7.83067E-06 1.33688E-05
A6 -1.41023E-09 -1.70059E-09 -5.35569E-08 -2.85627E-08
A8 -1.48656E-12 -2.33061E-13 5.33567E-11 1.52788E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[Various data]
Zoom ratio 1.54
Wide Angle Mid Telephoto Focal Length 17.55 21.66 27.10
F-number 1.86 1.86 1.86
Full angle 2ω 105.33 89.54 74.48
Image height Y 21.63 21.63 21.63
Lens length 158.61 150.53 144.72
[Variable interval data]
Wide Angle Mid-Telephoto
d8 27.3380 14.7730 3.5000
d10 10.3161 10.4491 10.4396
d12 2.6330 2.5000 2.5095
d25 1.9333 3.5713 6.1219
BF 24.7396 27.5879 30.5018
[Lens group data]
Group Initial surface Focal length
G1 1 -27.54
G3 11 -84.35
G4 13 28.74
G5 26 -76.45
図８は、本発明の実施例２のズームレンズのレンズ構成図である。 Figure 8 is a lens configuration diagram of a zoom lens according to a second embodiment of the present invention.
負の屈折力の第１レンズ群Ｇ１、正の屈折力の第２レンズ群Ｇ２、負の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、負の屈折力の第５レンズ群Ｇ５より構成され、広角端から望遠端への変倍に際して各群の間隔が変化し、第１レンズ群Ｇ１は像側へ移動し、第２レンズ群Ｇ２から第５レンズ群Ｇ５の各群はいずれも物体側へ移動する構成となっている。開口絞りＳは第４レンズ群Ｇ４の内部に備えられ、変倍の際には第４レンズ群Ｇ４と一体で移動する。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３レンズ群Ｇ３が光軸に沿って物体側へ移動する。本実施例において、正の屈折力の中間レンズ群ＧＭは第２レンズ群Ｇ２と第３レンズ群Ｇ３と第４レンズ群Ｇ４より構成され、負の屈折力の後側レンズ群ＧＲは第５レンズ群Ｇ５に相当する。 It is composed of a first lens group G1 with negative refractive power, a second lens group G2 with positive refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with negative refractive power. When changing the magnification from the wide-angle end to the telephoto end, the interval between each group changes, the first lens group G1 moves toward the image side, and each group from the second lens group G2 to the fifth lens group G5 moves toward the object side. The aperture stop S is provided inside the fourth lens group G4, and moves together with the fourth lens group G4 during the magnification change. When focusing from an object at infinity to an object at a close distance, the third lens group G3 moves toward the object side along the optical axis. In this embodiment, the middle lens group GM with positive refractive power is composed of the second lens group G2, the third lens group G3, and the fourth lens group G4, and the rear lens group GR with negative refractive power corresponds to the fifth lens group G5.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と、物体側に凸面を向けた負メニスカスレンズＬ２と、両凹レンズＬ３と、物体側に凸面を向けた正メニスカスレンズＬ４より構成される。負メニスカスレンズＬ１の物体側の面と、負メニスカスレンズＬ２の両面は所定の非球面形状となっている。 The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a negative meniscus lens L2 with a convex surface facing the object side, a biconcave lens L3, and a positive meniscus lens L4 with a convex surface facing the object side. The object side surface of the negative meniscus lens L1 and both surfaces of the negative meniscus lens L2 have a predetermined aspheric shape.
第２レンズ群Ｇ２は、物体側に凸面を向けた正メニスカスレンズＬ５より構成される。 The second lens group G2 is composed of a positive meniscus lens L5 with its convex surface facing the object side.
第３レンズ群Ｇ３は、両凹レンズＬ６より構成される。 The third lens group G3 is composed of a biconcave lens L6.
第４レンズ群Ｇ４は、両凸レンズＬ７と、物体側に凸面を向けた負メニスカスレンズＬ８と両凸レンズＬ９からなる接合レンズと、開口絞りＳと、両凸レンズＬ１０と、物体側に凹面を向けた正メニスカスレンズＬ１１と物体側に凹面を向けた負メニスカスレンズＬ１２からなる接合レンズより構成される。両凸レンズＬ７の物体側の面は所定の非球面形状となっている。
第５レンズ群Ｇ５は、両凹レンズＬ１３と物体側に凸面を向けた正メニスカスレンズＬ１４からなる接合レンズと、両凸レンズＬ１５と、両凹レンズＬ１６より構成される。両凹レンズＬ１６の物体側の面は所定の非球面形状となっている。
The fourth lens group G4 is composed of a biconvex lens L7, a cemented lens consisting of a negative meniscus lens L8 with its convex surface facing the object side and a biconvex lens L9, an aperture stop S, a biconvex lens L10, a cemented lens consisting of a positive meniscus lens L11 with its concave surface facing the object side and a negative meniscus lens L12 with its concave surface facing the object side. The object side surface of the biconvex lens L7 has a predetermined aspheric shape.
The fifth lens group G5 is composed of a cemented lens consisting of a biconcave lens L13 and a positive meniscus lens L14 with its convex surface facing the object side, a biconvex lens L15, and a biconcave lens L16. The object side surface of the biconcave lens L16 has a predetermined aspheric shape.
以下に実施例２に係るズームレンズの諸元値を示す。
数値実施例2
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1* 168.1495 3.0000 1.69350 53.20
2 29.1665 11.7695
3* 299.9377 2.2000 1.59201 67.02
4* 66.9508 9.2576
5 -203.4913 1.8000 1.49700 81.61
6 39.1299 2.3128
7 42.4581 6.1370 1.92119 23.96
8 74.1579 (d8)
9 51.6106 2.4325 1.88100 40.14
10 117.1827 (d10)
11 -69.7409 1.0000 1.51742 52.15
12 246.1079 (d12)
13* 57.0892 7.0345 1.77250 49.50
14 -73.1526 0.9767
15 723.1876 1.0000 1.83481 42.72
16 34.0584 7.3544 1.55032 75.50
17 -180.5853 2.1833
18(絞り) ∞ 5.1902
19 46.1467 8.3418 1.59282 68.62
20 -53.0782 0.2769
21 -91.7121 6.0156 1.59282 68.62
22 -26.0835 1.0000 1.90366 31.32
23 -43.8119 (d23)
24 -50.9921 1.0000 1.84666 23.78
25 24.1630 5.4231 1.49700 81.61
26 8927.7118 0.1500
27 41.0753 7.4166 1.92286 20.88
28 -41.8104 0.8289
29* -224.2850 1.5439 1.85135 40.10
30 32.0432 (BF)
像面 ∞
[非球面データ]
1面 3面 4面 13面
K 0.00000 0.00000 0.00000 0.00000
A4 6.57875E-06 9.16085E-06 1.98014E-05 -5.12878E-06
A6 -5.40017E-09 -1.13050E-09 -2.32973E-10 -3.54934E-10
A8 4.70474E-12 -4.81725E-12 1.34633E-11 -1.41294E-12
A10 -2.59476E-15 0.00000E+00 -1.56358E-14 0.00000E+00
A12 7.35683E-19 0.00000E+00 0.00000E+00 0.00000E+00
29面
K 0.00000
A4 -1.65473E-05
A6 -6.46502E-09
A8 1.36824E-11
A10 0.00000E+00
A12 0.00000E+00
[各種データ]
ズーム比 1.54
広角 中間 望遠
焦点距離 17.55 22.26 27.10
Fナンバー 1.86 1.86 1.86
全画角2ω 105.60 88.75 75.76
像高Y 21.63 21.63 21.63
レンズ全長 163.09 154.94 150.62
[可変間隔データ]
広角 中間 望遠
d8 26.4289 12.8964 3.5003
d10 11.1138 11.6472 12.1920
d12 3.5843 3.0509 2.5061
d23 1.5569 3.0622 5.0660
BF 24.7564 28.6414 31.7088
[レンズ群データ]
群 始面 焦点距離
G1 1 -27.36
G2 9 102.90
G3 11 -104.91
G4 13 29.23
G5 24 -68.20
The specifications of the zoom lens according to the second embodiment are shown below.
Numerical Example 2
Unit: mm
[Face data]
Surface number rd nd vd
Object surface ∞ (d0)
1* 168.1495 3.0000 1.69350 53.20
2 29.1665 11.7695
3* 299.9377 2.2000 1.59201 67.02
4* 66.9508 9.2576
5 -203.4913 1.8000 1.49700 81.61
6 39.1299 2.3128
7 42.4581 6.1370 1.92119 23.96
8 74.1579 (d8)
9 51.6106 2.4325 1.88100 40.14
10 117.1827 (d10)
11 -69.7409 1.0000 1.51742 52.15
12 246.1079 (d12)
13* 57.0892 7.0345 1.77250 49.50
14 -73.1526 0.9767
15 723.1876 1.0000 1.83481 42.72
16 34.0584 7.3544 1.55032 75.50
17 -180.5853 2.1833
18(Aperture) ∞ 5.1902
19 46.1467 8.3418 1.59282 68.62
20 -53.0782 0.2769
21 -91.7121 6.0156 1.59282 68.62
22 -26.0835 1.0000 1.90366 31.32
23 -43.8119 (d23)
24 -50.9921 1.0000 1.84666 23.78
25 24.1630 5.4231 1.49700 81.61
26 8927.7118 0.1500
27 41.0753 7.4166 1.92286 20.88
28 -41.8104 0.8289
29* -224.2850 1.5439 1.85135 40.10
30 32.0432 (BF)
Image plane ∞
[Aspheric data]
1st page 3rd page 4th page 13th page
K 0.00000 0.00000 0.00000 0.00000
A4 6.57875E-06 9.16085E-06 1.98014E-05 -5.12878E-06
A6 -5.40017E-09 -1.13050E-09 -2.32973E-10 -3.54934E-10
A8 4.70474E-12 -4.81725E-12 1.34633E-11 -1.41294E-12
A10 -2.59476E-15 0.00000E+00 -1.56358E-14 0.00000E+00
A12 7.35683E-19 0.00000E+00 0.00000E+00 0.00000E+00
29 pages
K 0.00000
A4 -1.65473E-05
A6 -6.46502E-09
A8 1.36824E-11
A10 0.00000E+00
A12 0.00000E+00
[Various data]
Zoom ratio 1.54
Wide Angle Mid Telephoto Focal Length 17.55 22.26 27.10
F-number 1.86 1.86 1.86
Full angle 2ω 105.60 88.75 75.76
Image height Y 21.63 21.63 21.63
Lens length 163.09 154.94 150.62
[Variable interval data]
Wide Angle Mid-Telephoto
d8 26.4289 12.8964 3.5003
d10 11.1138 11.6472 12.1920
d12 3.5843 3.0509 2.5061
d23 1.5569 3.0622 5.0660
BF 24.7564 28.6414 31.7088
[Lens group data]
Group Initial surface Focal length
G1 1 -27.36
G3 11 -104.91
G4 13 29.23
G5 24 -68.20
図１５は、本発明の実施例３のズームレンズのレンズ構成図である。 Figure 15 is a lens configuration diagram of a zoom lens according to a third embodiment of the present invention.
負の屈折力の第１レンズ群Ｇ１、正の屈折力の第２レンズ群Ｇ２、負の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、正の屈折力の第５レンズ群Ｇ５、負の屈折力の第６レンズ群Ｇ６より構成され、広角端から望遠端への変倍に際して各群の間隔が変化し、第１レンズ群Ｇ１は像側へ移動し、第２レンズ群Ｇ２から第６レンズ群Ｇ６の各群はいずれも物体側へ移動する構成となっている。開口絞りＳは第４レンズ群Ｇ４の像側に備えられ、変倍の際には第４レンズ群Ｇ４と一体で移動する。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３レンズ群Ｇ３が光軸に沿って物体側へ移動する。本実施例において、正の屈折力の中間レンズ群ＧＭは第２レンズ群Ｇ２と第３レンズ群Ｇ３第４レンズ群Ｇ４と第５レンズ群Ｇ５より構成され、負の屈折力の後側レンズ群ＧＲは第６レンズ群Ｇ６に相当する。 The lens is composed of a first lens group G1 with negative refractive power, a second lens group G2 with positive refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, a fifth lens group G5 with positive refractive power, and a sixth lens group G6 with negative refractive power. When changing magnification from the wide-angle end to the telephoto end, the spacing between each group changes, the first lens group G1 moves toward the image side, and each group from the second lens group G2 to the sixth lens group G6 moves toward the object side. The aperture stop S is provided on the image side of the fourth lens group G4, and moves together with the fourth lens group G4 during magnification. When focusing from an object at infinity to a close object, the third lens group G3 moves toward the object side along the optical axis. In this embodiment, the middle lens group GM with positive refractive power is composed of the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5, and the rear lens group GR with negative refractive power corresponds to the sixth lens group G6.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と、物体側に凸面を向けた負メニスカスレンズＬ２と、両凹レンズＬ３と、物体側に凸面を向けた正メニスカスレンズＬ４より構成される。負メニスカスレンズＬ１の両面と、負メニスカスレンズＬ２の両面は所定の非球面形状となっている。 The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a negative meniscus lens L2 with a convex surface facing the object side, a biconcave lens L3, and a positive meniscus lens L4 with a convex surface facing the object side. Both surfaces of the negative meniscus lens L1 and both surfaces of the negative meniscus lens L2 have a predetermined aspheric shape.
第２レンズ群Ｇ２は、物体側に凸面を向けた正メニスカスレンズＬ５より構成される。 The second lens group G2 is composed of a positive meniscus lens L5 with its convex surface facing the object side.
第３レンズ群Ｇ３は、両凹レンズＬ６より構成される。 The third lens group G3 is composed of a biconcave lens L6.
第４レンズ群Ｇ４は、両凸レンズＬ７と、両凹レンズＬ８と両凸レンズＬ９からなる接合レンズと、開口絞りＳより構成される。両凸レンズＬ７の両面は所定の非球面形状となっている。 The fourth lens group G4 is composed of a biconvex lens L7, a cemented lens consisting of a biconcave lens L8 and a biconvex lens L9, and an aperture stop S. Both surfaces of the biconvex lens L7 have a predetermined aspheric shape.
第５レンズ群Ｇ５は、物体側に凸面を向けた正メニスカスレンズＬ１０と、両凸レンズＬ１１と、物体側に凹面を向けた正メニスカスレンズＬ１２と物体側に凹面を向けた負メニスカスレンズＬ１３からなる接合レンズより構成される。 The fifth lens group G5 is composed of a cemented lens consisting of a positive meniscus lens L10 with a convex surface facing the object side, a biconvex lens L11, a positive meniscus lens L12 with a concave surface facing the object side, and a negative meniscus lens L13 with a concave surface facing the object side.
第６レンズ群Ｇ６は、両凹レンズＬ１４と物体側に凸面を向けた正メニスカスレンズＬ１５からなる接合レンズと、両凸レンズＬ１６と、両凹レンズＬ１７より構成される。両凹レンズＬ１７の両面は所定の非球面形状となっている。 The sixth lens group G6 is composed of a cemented lens consisting of a biconcave lens L14 and a positive meniscus lens L15 with its convex surface facing the object side, a biconvex lens L16, and a biconcave lens L17. Both surfaces of the biconcave lens L17 have a predetermined aspheric shape.
以下に実施例３に係るズームレンズの諸元値を示す。
数値実施例3
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1* 134.8389 3.1000 1.69350 53.20
2* 22.1464 13.4651
3* 265.9762 2.2000 1.59201 67.02
4* 45.3047 6.6212
5 -488.8883 1.8000 1.59282 68.62
6 87.5493 0.1500
7 49.3267 3.8985 2.00069 25.46
8 125.2152 (d8)
9 55.3291 2.4421 1.80610 33.27
10 139.1267 (d10)
11 -58.5799 1.0000 1.61340 44.27
12 296.1265 (d12)
13* 51.3730 7.5407 1.85135 40.10
14* -73.4860 0.1657
15 -458.3968 1.0000 1.90043 37.37
16 32.7554 8.3534 1.59282 68.62
17 -103.5478 1.5570
18(絞り) ∞ (d18)
19 59.2886 2.9506 1.45860 90.19
20 133.6891 0.1502
21 44.9845 8.9688 1.43700 95.10
22 -41.9307 0.1500
23 -133.4212 5.3438 1.55032 75.50
24 -27.2786 1.0000 1.90366 31.32
25 -64.9399 (d25)
26 -67.9520 1.0000 1.80809 22.76
27 25.1108 5.7949 1.55032 75.50
28 74.2878 0.1500
29 38.5090 5.4334 1.92286 20.88
30 -40.2597 0.1982
31* -218.7266 1.5452 1.80610 40.73
32* 33.2825 (BF)
像面 ∞
[非球面データ]
1面 2面 3面 4面
K 0.00000 -0.54040 0.00000 0.00000
A4 4.81079E-06 3.82164E-06 -1.92457E-07 4.76009E-06
A6 -6.72593E-09 1.43875E-09 9.24850E-10 7.74193E-10
A8 5.28292E-12 -8.71470E-12 -2.49473E-12 1.08151E-11
A10 -2.26092E-15 -1.51091E-14 0.00000E+00 1.15569E-14
A12 4.64427E-19 0.00000E+00 0.00000E+00 0.00000E+00
13面 14面 31面 32面
K 0.00000 0.00000 0.00000 0.00000
A4 -4.62956E-06 2.52116E-07 -8.93323E-06 1.37447E-05
A6 -1.62073E-09 -2.04282E-09 -5.25953E-08 -2.73022E-08
A8 -6.17231E-12 -3.86617E-12 5.11973E-11 1.21459E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[各種データ]
ズーム比 1.54
広角 中間 望遠
焦点距離 17.55 21.70 27.10
Fナンバー 1.86 1.86 1.86
全画角2ω 105.33 89.42 74.48
像高Y 21.63 21.63 21.63
レンズ全長 158.09 149.59 143.10
[可変間隔データ]
広角 中間 望遠
d8 27.8609 14.8073 3.5000
d10 9.6611 9.9704 10.2780
d12 3.1169 2.8076 2.5000
d18 4.8105 4.9456 4.0805
d25 2.0488 3.9469 6.6429
BF 24.6163 27.1344 30.1179
[レンズ群データ]
群 始面 焦点距離
G1 1 -29.70
G2 9 112.49
G3 11 -79.64
G4 13 46.10
G5 19 49.25
G6 26 -109.77
The specifications of the zoom lens according to the third embodiment are shown below.
Numerical Example 3
Unit: mm
[Face data]
Surface number rd nd vd
Object surface ∞ (d0)
1* 134.8389 3.1000 1.69350 53.20
2* 22.1464 13.4651
3* 265.9762 2.2000 1.59201 67.02
4* 45.3047 6.6212
5 -488.8883 1.8000 1.59282 68.62
6 87.5493 0.1500
7 49.3267 3.8985 2.00069 25.46
8 125.2152 (d8)
9 55.3291 2.4421 1.80610 33.27
10 139.1267 (d10)
11 -58.5799 1.0000 1.61340 44.27
12 296.1265 (d12)
13* 51.3730 7.5407 1.85135 40.10
14* -73.4860 0.1657
15 -458.3968 1.0000 1.90043 37.37
16 32.7554 8.3534 1.59282 68.62
17 -103.5478 1.5570
18(Aperture) ∞ (d18)
19 59.2886 2.9506 1.45860 90.19
20 133.6891 0.1502
21 44.9845 8.9688 1.43700 95.10
22 -41.9307 0.1500
23 -133.4212 5.3438 1.55032 75.50
24 -27.2786 1.0000 1.90366 31.32
25 -64.9399 (d25)
26 -67.9520 1.0000 1.80809 22.76
27 25.1108 5.7949 1.55032 75.50
28 74.2878 0.1500
29 38.5090 5.4334 1.92286 20.88
30 -40.2597 0.1982
31* -218.7266 1.5452 1.80610 40.73
32* 33.2825 (BF)
Image plane ∞
[Aspheric data]
Side 1 Side 2 Side 3 Side 4
K 0.00000 -0.54040 0.00000 0.00000
A4 4.81079E-06 3.82164E-06 -1.92457E-07 4.76009E-06
A6 -6.72593E-09 1.43875E-09 9.24850E-10 7.74193E-10
A8 5.28292E-12 -8.71470E-12 -2.49473E-12 1.08151E-11
A10 -2.26092E-15 -1.51091E-14 0.00000E+00 1.15569E-14
A12 4.64427E-19 0.00000E+00 0.00000E+00 0.00000E+00
13th 14th 31st 32nd
K 0.00000 0.00000 0.00000 0.00000
A4 -4.62956E-06 2.52116E-07 -8.93323E-06 1.37447E-05
A6 -1.62073E-09 -2.04282E-09 -5.25953E-08 -2.73022E-08
A8 -6.17231E-12 -3.86617E-12 5.11973E-11 1.21459E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[Various data]
Zoom ratio 1.54
Wide Angle Mid Telephoto Focal Length 17.55 21.70 27.10
F-number 1.86 1.86 1.86
Full angle 2ω 105.33 89.42 74.48
Image height Y 21.63 21.63 21.63
Lens length 158.09 149.59 143.10
[Variable interval data]
Wide Angle Mid-Telephoto
d8 27.8609 14.8073 3.5000
d10 9.6611 9.9704 10.2780
d12 3.1169 2.8076 2.5000
d18 4.8105 4.9456 4.0805
d25 2.0488 3.9469 6.6429
BF 24.6163 27.1344 30.1179
[Lens group data]
Group Initial surface Focal length
G1 1 -29.70
G3 11 -79.64
G4 13 46.10
G5 19 49.25
G6 26 -109.77
図２２は、本発明の実施例４のズームレンズのレンズ構成図である。 Figure 22 is a lens configuration diagram of a zoom lens according to the fourth embodiment of the present invention.
負の屈折力の第１レンズ群Ｇ１、正の屈折力の第２レンズ群Ｇ２、負の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、正の屈折力の第５レンズ群Ｇ５、負の屈折力の第６レンズ群Ｇ６より構成され、広角端から望遠端への変倍に際して各群の間隔が変化し、第１レンズ群Ｇ１は像側へ移動し、第２レンズ群Ｇ２から第６レンズ群Ｇ６の各群はいずれも物体側へ移動する構成となっている。開口絞りＳは第４レンズ群Ｇ４の像側に備えられ、変倍の際には第４レンズ群Ｇ４と一体で移動する。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３レンズ群Ｇ３が光軸に沿って物体側へ移動する。本実施例において、正の屈折力の中間レンズ群ＧＭは第２レンズ群Ｇ２と、第３レンズ群Ｇ３と、第４レンズ群Ｇ４と第５レンズ群Ｇ５より構成され、負の屈折力の後側レンズ群ＧＲは第６レンズ群Ｇ６に相当する。 The lens is composed of a first lens group G1 with negative refractive power, a second lens group G2 with positive refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, a fifth lens group G5 with positive refractive power, and a sixth lens group G6 with negative refractive power. When changing magnification from the wide-angle end to the telephoto end, the spacing between each group changes, the first lens group G1 moves toward the image side, and each group from the second lens group G2 to the sixth lens group G6 moves toward the object side. The aperture stop S is provided on the image side of the fourth lens group G4, and moves together with the fourth lens group G4 during magnification. When focusing from an object at infinity to a close object, the third lens group G3 moves toward the object side along the optical axis. In this embodiment, the middle lens group GM with positive refractive power is composed of the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5, and the rear lens group GR with negative refractive power corresponds to the sixth lens group G6.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と、物体側に凸面を向けた負メニスカスレンズＬ２と、物体側に凸面を向けた負メニスカスレンズＬ３と物体側に凸面を向けた正メニスカスレンズＬ４からなる接合レンズより構成される。負メニスカスレンズＬ１の両面と、負メニスカスレンズＬ２の両面は所定の非球面形状となっている。 The first lens group G1 is composed of a cemented lens consisting of a negative meniscus lens L1 with a convex surface facing the object side, a negative meniscus lens L2 with a convex surface facing the object side, a negative meniscus lens L3 with a convex surface facing the object side, and a positive meniscus lens L4 with a convex surface facing the object side. Both surfaces of the negative meniscus lens L1 and both surfaces of the negative meniscus lens L2 have a predetermined aspheric shape.
第２レンズ群Ｇ２は、物体側に凸面を向けた正メニスカスレンズＬ５より構成される。 The second lens group G2 is composed of a positive meniscus lens L5 with its convex surface facing the object side.
第３レンズ群Ｇ３は、両凹レンズＬ６より構成される。 The third lens group G3 is composed of a biconcave lens L6.
第４レンズ群Ｇ４は、両凸レンズＬ７と、物体側に凸面を向けた負メニスカスレンズＬ８と両凸レンズＬ９からなる接合レンズと、開口絞りＳより構成される。両凸レンズＬ７の両面は所定の非球面形状となっている。 The fourth lens group G4 is composed of a biconvex lens L7, a cemented lens consisting of a negative meniscus lens L8 with its convex surface facing the object side and a biconvex lens L9, and an aperture stop S. Both surfaces of the biconvex lens L7 have a predetermined aspheric shape.
第５レンズ群Ｇ５は、物体側に凸面を向けた正メニスカスレンズＬ１０と、両凸レンズＬ１１と、物体側に凹面を向けた正メニスカスレンズＬ１２と物体側に凹面を向けた負メニスカスレンズＬ１３からなる接合レンズより構成される。 The fifth lens group G5 is composed of a cemented lens consisting of a positive meniscus lens L10 with a convex surface facing the object side, a biconvex lens L11, a positive meniscus lens L12 with a concave surface facing the object side, and a negative meniscus lens L13 with a concave surface facing the object side.
第６レンズ群Ｇ６は、両凹レンズＬ１４と物体側に凸面を向けた正メニスカスレンズＬ１５からなる接合レンズと、両凸レンズＬ１６と、両凹レンズＬ１７より構成される。両凹レンズＬ１７の両面は所定の非球面形状となっている。 The sixth lens group G6 is composed of a cemented lens consisting of a biconcave lens L14 and a positive meniscus lens L15 with its convex surface facing the object side, a biconvex lens L16, and a biconcave lens L17. Both surfaces of the biconcave lens L17 have a predetermined aspheric shape.
以下に実施例４に係るズームレンズの諸元値を示す。
数値実施例4
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1* 115.4505 3.1000 1.69350 53.20
2* 22.7962 13.2894
3* 283.4476 2.2000 1.59201 67.02
4* 61.9236 4.9919
5 903.7388 1.8000 1.49700 81.61
6 33.4533 4.4583 2.00069 25.46
7 59.2015 (d7)
8 50.0000 2.7168 1.80610 33.27
9 136.6602 (d9)
10 -47.2556 1.0000 1.61340 44.27
11 9697.8135 (d11)
12* 55.7489 7.4269 1.85135 40.10
13* -70.6578 0.1500
14 324.3863 1.0000 1.90043 37.37
15 26.3740 9.7363 1.59282 68.62
16 -156.3806 2.0288
17(絞り) ∞ (d17)
18 66.4973 3.7053 1.49700 81.61
19 496.9484 0.1500
20 67.5699 8.8340 1.43700 95.10
21 -40.0308 0.1500
22 -171.5372 5.1209 1.55032 75.50
23 -32.4905 1.0000 1.90366 31.32
24 -61.5676 (d24)
25 -57.1750 1.0000 1.80809 22.76
26 26.9347 8.6684 1.55032 75.50
27 72.8337 0.1500
28 40.2286 6.1503 1.92286 20.88
29 -39.4909 0.1500
30* -116.8249 1.2000 1.80610 40.73
31* 39.6011 (BF)
像面 ∞
[非球面データ]
1面 2面 3面 4面
K 0.00000 -0.50229 0.00000 0.00000
A4 4.40308E-06 4.23172E-06 5.76747E-07 3.75975E-06
A6 -6.84244E-09 -4.04124E-11 1.87219E-09 2.36457E-09
A8 5.38453E-12 -7.80132E-12 -3.02800E-12 4.78466E-12
A10 -2.19363E-15 -1.28101E-14 0.00000E+00 1.36785E-14
A12 4.17014E-19 0.00000E+00 0.00000E+00 0.00000E+00
12面 13面 30面 31面
K 0.00000 0.00000 0.00000 0.00000
A4 -5.20368E-06 -4.07430E-08 -8.06419E-06 1.19055E-05
A6 -3.52695E-10 -1.32456E-09 -5.11998E-08 -3.12562E-08
A8 -3.02194E-12 -1.41928E-12 5.72402E-11 2.13454E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[各種データ]
ズーム比 1.57
広角 中間 望遠
焦点距離 18.50 23.38 29.10
Fナンバー 1.86 1.86 1.86
全画角2ω 102.72 85.20 70.59
像高Y 21.63 21.63 21.63
レンズ全長 161.98 154.83 150.90
[可変間隔データ]
広角 中間 望遠
d7 27.8313 13.9706 3.5000
d9 10.5999 10.3077 10.6046
d11 2.5047 2.7969 2.5000
d17 3.8789 5.6029 6.2823
d24 2.1498 4.7512 8.3912
BF 24.8386 27.2225 29.4450
[レンズ群データ]
群 始面 焦点距離
G1 1 -27.36
G2 8 96.46
G3 10 -76.66
G4 12 46.49
G5 18 43.71
G6 25 -96.32
The specifications of the zoom lens according to the fourth embodiment are shown below.
Numerical Example 4
Unit: mm
[Face data]
Surface number rd nd vd
Object surface ∞ (d0)
1* 115.4505 3.1000 1.69350 53.20
2* 22.7962 13.2894
3* 283.4476 2.2000 1.59201 67.02
4* 61.9236 4.9919
5 903.7388 1.8000 1.49700 81.61
6 33.4533 4.4583 2.00069 25.46
7 59.2015 (d7)
8 50.0000 2.7168 1.80610 33.27
9 136.6602 (d9)
10 -47.2556 1.0000 1.61340 44.27
11 9697.8135 (d11)
12* 55.7489 7.4269 1.85135 40.10
13* -70.6578 0.1500
14 324.3863 1.0000 1.90043 37.37
15 26.3740 9.7363 1.59282 68.62
16 -156.3806 2.0288
17(Aperture) ∞ (d17)
18 66.4973 3.7053 1.49700 81.61
19 496.9484 0.1500
20 67.5699 8.8340 1.43700 95.10
21 -40.0308 0.1500
22 -171.5372 5.1209 1.55032 75.50
23 -32.4905 1.0000 1.90366 31.32
24 -61.5676 (d24)
25 -57.1750 1.0000 1.80809 22.76
26 26.9347 8.6684 1.55032 75.50
27 72.8337 0.1500
28 40.2286 6.1503 1.92286 20.88
29 -39.4909 0.1500
30* -116.8249 1.2000 1.80610 40.73
31* 39.6011 (BF)
Image plane ∞
[Aspheric data]
Side 1 Side 2 Side 3 Side 4
K 0.00000 -0.50229 0.00000 0.00000
A4 4.40308E-06 4.23172E-06 5.76747E-07 3.75975E-06
A6 -6.84244E-09 -4.04124E-11 1.87219E-09 2.36457E-09
A8 5.38453E-12 -7.80132E-12 -3.02800E-12 4.78466E-12
A10 -2.19363E-15 -1.28101E-14 0.00000E+00 1.36785E-14
A12 4.17014E-19 0.00000E+00 0.00000E+00 0.00000E+00
12th page 13th page 30th page 31st page
K 0.00000 0.00000 0.00000 0.00000
A4 -5.20368E-06 -4.07430E-08 -8.06419E-06 1.19055E-05
A6 -3.52695E-10 -1.32456E-09 -5.11998E-08 -3.12562E-08
A8 -3.02194E-12 -1.41928E-12 5.72402E-11 2.13454E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[Various data]
Zoom ratio 1.57
Wide Angle Mid Telephoto Focal Length 18.50 23.38 29.10
F-number 1.86 1.86 1.86
Full angle 2ω 102.72 85.20 70.59
Image height Y 21.63 21.63 21.63
Lens length 161.98 154.83 150.90
[Variable interval data]
Wide Angle Mid-Telephoto
d7 27.8313 13.9706 3.5000
d9 10.5999 10.3077 10.6046
d11 2.5047 2.7969 2.5000
d17 3.8789 5.6029 6.2823
d24 2.1498 4.7512 8.3912
BF 24.8386 27.2225 29.4450
[Lens group data]
Group Initial surface Focal length
G1 1 -27.36
G2 8 96.46
G3 10 -76.66
G4 12 46.49
G5 18 43.71
G6 25 -96.32
図２９は、本発明の実施例５のズームレンズのレンズ構成図である。 Figure 29 is a lens configuration diagram of a zoom lens according to the fifth embodiment of the present invention.
負の屈折力の第１レンズ群Ｇ１、正の屈折力の第２レンズ群Ｇ２、負の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、負の屈折力の第５レンズ群Ｇ５より構成され、広角端から望遠端への変倍に際して各群の間隔が変化し、第１レンズ群Ｇ１は像側へ移動し、第２レンズ群Ｇ２から第５レンズ群Ｇ５の各群はいずれも物体側へ移動する構成となっている。開口絞りＳは第４レンズ群Ｇ４の内部に備えられ、変倍の際には第４レンズ群Ｇ４と一体で移動する。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３レンズ群Ｇ３が光軸に沿って物体側へ移動する。本実施例において、正の屈折力の中間レンズ群ＧＭは第２レンズ群Ｇ２と、第３レンズ群Ｇ３と第４レンズ群Ｇ４より構成され、負の屈折力の後側レンズ群ＧＲは第５レンズ群Ｇ５に相当する。 It is composed of a first lens group G1 with negative refractive power, a second lens group G2 with positive refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with negative refractive power. When changing the magnification from the wide-angle end to the telephoto end, the interval between each group changes, the first lens group G1 moves toward the image side, and each group from the second lens group G2 to the fifth lens group G5 moves toward the object side. The aperture stop S is provided inside the fourth lens group G4, and moves together with the fourth lens group G4 during the magnification change. When focusing from an object at infinity to an object at a close distance, the third lens group G3 moves toward the object side along the optical axis. In this embodiment, the middle lens group GM with positive refractive power is composed of the second lens group G2, the third lens group G3, and the fourth lens group G4, and the rear lens group GR with negative refractive power corresponds to the fifth lens group G5.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と、物体側に凸面を向けた負メニスカスレンズＬ２と、両凹レンズＬ３と、物体側に凸面を向けた正メニスカスレンズＬ４より構成される。負メニスカスレンズＬ１の両面と、負メニスカスレンズＬ２の両面は所定の非球面形状となっている。 The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a negative meniscus lens L2 with a convex surface facing the object side, a biconcave lens L3, and a positive meniscus lens L4 with a convex surface facing the object side. Both surfaces of the negative meniscus lens L1 and both surfaces of the negative meniscus lens L2 have a predetermined aspheric shape.
第２レンズ群Ｇ２は、物体側に凸面を向けた正メニスカスレンズＬ５より構成される。 The second lens group G2 is composed of a positive meniscus lens L5 with its convex surface facing the object side.
第３レンズ群Ｇ３は、物体側に凹面を向けた負メニスカスレンズＬ６より構成される。 The third lens group G3 is composed of a negative meniscus lens L6 with its concave surface facing the object side.
第４レンズ群Ｇ４は、両凸レンズＬ７と、両凹レンズＬ８と両凸レンズＬ９からなる接合レンズと、開口絞りＳと、両凸レンズＬ１０と、両凸レンズＬ１１と、物体側に凹面を向けた正メニスカスレンズＬ１２と物体側に凹面を向けた負メニスカスレンズＬ１３からなる接合レンズより構成される。両凸レンズＬ７の両面は所定の非球面形状となっている。 The fourth lens group G4 is composed of a biconvex lens L7, a cemented lens consisting of a biconcave lens L8 and a biconvex lens L9, an aperture stop S, a biconvex lens L10, a biconvex lens L11, and a cemented lens consisting of a positive meniscus lens L12 with its concave surface facing the object side, and a negative meniscus lens L13 with its concave surface facing the object side. Both surfaces of the biconvex lens L7 have a predetermined aspheric shape.
第５レンズ群Ｇ５は、両凹レンズＬ１４と物体側に凸面を向けた正メニスカスレンズＬ１５からなる接合レンズと、両凸レンズＬ１６と、両凹レンズＬ１７より構成される。両凹レンズＬ１７の両面は所定の非球面形状となっている。 The fifth lens group G5 is composed of a cemented lens consisting of a biconcave lens L14 and a positive meniscus lens L15 with its convex surface facing the object side, a biconvex lens L16, and a biconcave lens L17. Both surfaces of the biconcave lens L17 have a predetermined aspheric shape.
以下に実施例５に係るズームレンズの諸元値を示す。
数値実施例5
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1* 116.6695 3.1000 1.69350 53.20
2* 22.0820 15.4105
3* 300.0000 2.2099 1.59201 67.02
4* 41.0218 7.1811
5 -1872.8071 2.2789 1.59282 68.62
6 65.8998 0.5181
7 42.4140 4.3964 1.84666 23.78
8 101.1766 (d8)
9 69.3123 2.4131 1.80610 33.27
10 462.9826 (d10)
11 -48.9554 1.0000 1.61340 44.27
12 -982740.8846 (d12)
13* 58.7023 7.0032 1.85135 40.10
14* -59.8298 0.6178
15 -233.1476 1.0000 1.90043 37.37
16 36.2437 6.8067 1.59282 68.62
17 -111.6018 1.8278
18(絞り) ∞ 4.6911
19 53.0293 4.0664 1.43700 95.10
20 -2776.8615 0.1511
21 67.2348 7.0469 1.43700 95.10
22 -39.8224 0.1500
23 -102.8999 4.8926 1.55032 75.50
24 -26.0971 1.0000 1.90366 31.32
25 -58.5239 (d25)
26 -72.5504 1.0000 1.80809 22.76
27 24.4292 7.1206 1.55032 75.50
28 82.3672 0.1500
29 40.3623 5.6308 1.92286 20.88
30 -38.5931 0.1500
31* -300.0000 1.2000 1.80610 40.73
32* 32.0132 (BF)
像面 ∞
[非球面データ]
1面 2面 3面 4面
K 0.00000 -0.53917 0.00000 0.00000
A4 4.71965E-06 4.16844E-06 -1.08139E-06 4.13080E-06
A6 -6.64937E-09 9.27224E-10 9.11992E-10 3.57252E-09
A8 5.30960E-12 -9.13174E-12 -1.92506E-12 9.51914E-12
A10 -2.26489E-15 -1.48597E-14 0.00000E+00 2.79950E-14
A12 4.57456E-19 0.00000E+00 0.00000E+00 0.00000E+00
13面 14面 31面 32面
K 0.00000 0.00000 0.00000 0.00000
A4 -4.70135E-06 8.91019E-07 -9.34043E-06 1.39134E-05
A6 -1.82262E-09 -2.61692E-09 -7.05202E-08 -4.32403E-08
A8 -3.07129E-12 3.19347E-13 9.67449E-11 5.72301E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[各種データ]
ズーム比 1.51
広角 中間 望遠
焦点距離 15.45 18.97 23.30
Fナンバー 1.86 1.86 1.86
全画角2ω 113.38 97.73 83.24
像高Y 21.63 21.63 21.63
レンズ全長 159.50 151.34 144.76
[可変間隔データ]
広角 中間 望遠
d8 27.1693 14.9012 3.5004
d10 10.0434 10.5717 9.5934
d12 3.0282 2.5000 3.4783
d25 2.0892 4.4499 7.0750
BF 24.1610 25.9040 28.1030
[レンズ群データ]
群 始面 焦点距離
G1 1 -25.81
G2 9 100.85
G3 11 -79.81
G4 13 29.21
G5 26 -128.90
The specifications of the zoom lens according to the fifth embodiment are shown below.
Numerical Example 5
Unit: mm
[Surface data]
Surface number rd nd vd
Object surface ∞ (d0)
1* 116.6695 3.1000 1.69350 53.20
2* 22.0820 15.4105
3* 300.0000 2.2099 1.59201 67.02
4* 41.0218 7.1811
5 -1872.8071 2.2789 1.59282 68.62
6 65.8998 0.5181
7 42.4140 4.3964 1.84666 23.78
8 101.1766 (d8)
9 69.3123 2.4131 1.80610 33.27
10 462.9826 (d10)
11 -48.9554 1.0000 1.61340 44.27
12 -982740.8846 (d12)
13* 58.7023 7.0032 1.85135 40.10
14* -59.8298 0.6178
15 -233.1476 1.0000 1.90043 37.37
16 36.2437 6.8067 1.59282 68.62
17 -111.6018 1.8278
18(Aperture) ∞ 4.6911
19 53.0293 4.0664 1.43700 95.10
20 -2776.8615 0.1511
21 67.2348 7.0469 1.43700 95.10
22 -39.8224 0.1500
23 -102.8999 4.8926 1.55032 75.50
24 -26.0971 1.0000 1.90366 31.32
25 -58.5239 (d25)
26 -72.5504 1.0000 1.80809 22.76
27 24.4292 7.1206 1.55032 75.50
28 82.3672 0.1500
29 40.3623 5.6308 1.92286 20.88
30 -38.5931 0.1500
31* -300.0000 1.2000 1.80610 40.73
32* 32.0132 (BF)
Image plane ∞
[Aspheric data]
Side 1 Side 2 Side 3 Side 4
K 0.00000 -0.53917 0.00000 0.00000
A4 4.71965E-06 4.16844E-06 -1.08139E-06 4.13080E-06
A6 -6.64937E-09 9.27224E-10 9.11992E-10 3.57252E-09
A8 5.30960E-12 -9.13174E-12 -1.92506E-12 9.51914E-12
A10 -2.26489E-15 -1.48597E-14 0.00000E+00 2.79950E-14
A12 4.57456E-19 0.00000E+00 0.00000E+00 0.00000E+00
13th 14th 31st 32nd
K 0.00000 0.00000 0.00000 0.00000
A4 -4.70135E-06 8.91019E-07 -9.34043E-06 1.39134E-05
A6 -1.82262E-09 -2.61692E-09 -7.05202E-08 -4.32403E-08
A8 -3.07129E-12 3.19347E-13 9.67449E-11 5.72301E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[Various data]
Zoom ratio 1.51
Wide Angle Mid Telephoto Focal Length 15.45 18.97 23.30
F-number 1.86 1.86 1.86
Full angle 2ω 113.38 97.73 83.24
Image height Y 21.63 21.63 21.63
Lens length 159.50 151.34 144.76
[Variable interval data]
Wide Angle Mid-Telephoto
d8 27.1693 14.9012 3.5004
d10 10.0434 10.5717 9.5934
d12 3.0282 2.5000 3.4783
d25 2.0892 4.4499 7.0750
BF 24.1610 25.9040 28.1030
[Lens group data]
Group Initial surface Focal length
G1 1 -25.81
G3 11 -79.81
G4 13 29.21
G5 26 -128.90
図３６は、本発明の実施例６のズームレンズのレンズ構成図である。 Figure 36 is a lens configuration diagram of a zoom lens according to the sixth embodiment of the present invention.
負の屈折力の第１レンズ群Ｇ１、正の屈折力の第２レンズ群Ｇ２、負の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、負の屈折力の第５レンズ群Ｇ５より構成され、広角端から望遠端への変倍に際して各群の間隔が変化し、第１レンズ群Ｇ１は像側へ移動し、第２レンズ群Ｇ２から第５レンズ群Ｇ５の各群はいずれも物体側へ移動する構成となっている。開口絞りＳは第４レンズ群Ｇ４の内部に備えられ、変倍の際には第４レンズ群Ｇ４と一体で移動する。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３レンズ群Ｇ３が光軸に沿って物体側へ移動する。本実施例において、正の屈折力の中間レンズ群ＧＭは第２レンズ群Ｇ２と、第３レンズ群Ｇ３と第４レンズ群Ｇ４より構成され、負の屈折力の後側レンズ群ＧＲは第５レンズ群Ｇ５に相当する。 It is composed of a first lens group G1 with negative refractive power, a second lens group G2 with positive refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, and a fifth lens group G5 with negative refractive power. When changing the magnification from the wide-angle end to the telephoto end, the interval between each group changes, the first lens group G1 moves toward the image side, and each group from the second lens group G2 to the fifth lens group G5 moves toward the object side. The aperture stop S is provided inside the fourth lens group G4, and moves together with the fourth lens group G4 during the magnification change. When focusing from an object at infinity to an object at a close distance, the third lens group G3 moves toward the object side along the optical axis. In this embodiment, the middle lens group GM with positive refractive power is composed of the second lens group G2, the third lens group G3, and the fourth lens group G4, and the rear lens group GR with negative refractive power corresponds to the fifth lens group G5.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と、物体側に凸面を向けた負メニスカスレンズＬ２と、物体側に凸面を向けた負メニスカスレンズＬ３と、物体側に凸面を向けた正メニスカスレンズＬ４より構成される。負メニスカスレンズＬ１の両面と、負メニスカスレンズＬ２の両面は所定の非球面形状となっている。 The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a negative meniscus lens L2 with a convex surface facing the object side, a negative meniscus lens L3 with a convex surface facing the object side, and a positive meniscus lens L4 with a convex surface facing the object side. Both surfaces of the negative meniscus lens L1 and both surfaces of the negative meniscus lens L2 have a predetermined aspheric shape.
第２レンズ群Ｇ２は、物体側に凸面を向けた正メニスカスレンズＬ５より構成される。 The second lens group G2 is composed of a positive meniscus lens L5 with its convex surface facing the object side.
第３レンズ群Ｇ３は、両凹レンズＬ６と物体側に凸面を向けた正メニスカスレンズＬ７からなる接合レンズより構成される。 The third lens group G3 is composed of a cemented lens consisting of a biconcave lens L6 and a positive meniscus lens L7 with its convex surface facing the object side.
第４レンズ群Ｇ４は、両凸レンズＬ８と、物体側に凸面を向けた負メニスカスレンズＬ９と両凸レンズＬ１０からなる接合レンズと、開口絞りＳと、両凸レンズＬ１１と、両凸レンズＬ１２と物体側に凹面を向けた負メニスカスレンズＬ１３からなる接合レンズより構成される。両凸レンズＬ８の両面は所定の非球面形状となっている。 The fourth lens group G4 is composed of a biconvex lens L8, a cemented lens consisting of a negative meniscus lens L9 with its convex surface facing the object side and a biconvex lens L10, an aperture stop S, a biconvex lens L11, and a cemented lens consisting of a biconvex lens L12 and a negative meniscus lens L13 with its concave surface facing the object side. Both surfaces of the biconvex lens L8 have a predetermined aspheric shape.
第５レンズ群Ｇ５は、両凹レンズＬ１４と物体側に凸面を向けた正メニスカスレンズＬ１５からなる接合レンズと、両凸レンズＬ１６と、両凹レンズＬ１７より構成される。両凹レンズＬ１７の両面は所定の非球面形状となっている。 The fifth lens group G5 is composed of a cemented lens consisting of a biconcave lens L14 and a positive meniscus lens L15 with its convex surface facing the object side, a biconvex lens L16, and a biconcave lens L17. Both surfaces of the biconcave lens L17 have a predetermined aspheric shape.
以下に実施例６に係るズームレンズの諸元値を示す。
数値実施例6
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1* 110.6337 3.1000 1.69350 53.20
2* 22.8459 13.3933
3* 299.9998 2.2000 1.59201 67.02
4* 41.0934 6.2009
5 294.3902 1.8000 1.59282 68.62
6 51.3138 0.1500
7 39.6012 4.5168 1.84666 23.78
8 92.5829 (d8)
9 56.6381 2.7512 1.78590 43.94
10 225.0143 (d10)
11 -60.4060 1.0000 1.61997 63.88
12 63.3240 2.7964 1.58144 40.89
13 289.9910 (d13)
14* 53.9400 7.3806 1.85135 40.10
15* -73.1462 0.1500
16 639.8986 1.0000 1.90366 31.32
17 28.7936 8.9349 1.59282 68.62
18 -130.7737 1.8689
19(絞り) ∞ 7.3919
20 42.9711 9.2614 1.43700 95.10
21 -46.2652 0.1500
22 313.2339 5.7431 1.55032 75.50
23 -35.2144 1.0000 1.90366 31.32
24 -73.5466 (d24)
25 -73.9028 1.0000 1.84666 23.78
26 26.3510 5.4147 1.49700 81.61
27 80.6911 0.1500
28 39.6498 5.4450 1.92286 20.88
29 -40.3941 0.1500
30* -196.1666 1.2000 1.80610 40.73
31* 32.0000 (BF)
像面 ∞
[非球面データ]
1面 2面 3面 4面
K 0.00000 -0.49490 0.00000 0.00000
A4 4.47779E-06 4.43542E-06 4.77024E-07 4.15155E-06
A6 -6.78600E-09 2.25161E-10 2.09483E-09 3.89340E-09
A8 5.31922E-12 -9.29055E-12 -2.16305E-12 8.18814E-12
A10 -2.25307E-15 -1.18955E-14 0.00000E+00 1.49032E-14
A12 4.02202E-19 0.00000E+00 0.00000E+00 0.00000E+00
14面 15面 30面 31面
K 0.00000 0.00000 0.00000 0.00000
A4 -4.48844E-06 7.27005E-07 -8.26771E-06 1.29857E-05
A6 -1.56250E-09 -2.23592E-09 -6.11400E-08 -3.88053E-08
A8 -7.96852E-13 5.02688E-13 6.08894E-11 1.83629E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[各種データ]
ズーム比 1.54
広角 中間 望遠
焦点距離 17.55 21.42 27.10
Fナンバー 1.86 1.86 1.86
全画角2ω 105.33 90.39 74.48
像高Y 21.63 21.63 21.63
レンズ全長 162.00 153.86 147.36
[可変間隔データ]
広角 中間 望遠
d8 28.1863 15.8227 3.5000
d10 9.4442 9.7042 9.7043
d13 2.7601 2.5001 2.5000
d24 2.0815 4.0488 7.1822
BF 25.3738 27.6326 30.3206
[レンズ群データ]
群 始面 焦点距離
G1 1 -27.42
G2 9 95.62
G3 11 -77.33
G4 14 29.93
G5 25 -78.04
The specifications of the zoom lens according to the sixth embodiment are shown below.
Numerical Example 6
Unit: mm
[Face data]
Surface number rd nd vd
Object surface ∞ (d0)
1* 110.6337 3.1000 1.69350 53.20
2* 22.8459 13.3933
3* 299.9998 2.2000 1.59201 67.02
4* 41.0934 6.2009
5 294.3902 1.8000 1.59282 68.62
6 51.3138 0.1500
7 39.6012 4.5168 1.84666 23.78
8 92.5829 (d8)
9 56.6381 2.7512 1.78590 43.94
10 225.0143 (d10)
11 -60.4060 1.0000 1.61997 63.88
12 63.3240 2.7964 1.58144 40.89
13 289.9910 (d13)
14* 53.9400 7.3806 1.85135 40.10
15* -73.1462 0.1500
16 639.8986 1.0000 1.90366 31.32
17 28.7936 8.9349 1.59282 68.62
18 -130.7737 1.8689
19(Aperture) ∞ 7.3919
20 42.9711 9.2614 1.43700 95.10
21 -46.2652 0.1500
22 313.2339 5.7431 1.55032 75.50
23 -35.2144 1.0000 1.90366 31.32
24 -73.5466 (d24)
25 -73.9028 1.0000 1.84666 23.78
26 26.3510 5.4147 1.49700 81.61
27 80.6911 0.1500
28 39.6498 5.4450 1.92286 20.88
29 -40.3941 0.1500
30* -196.1666 1.2000 1.80610 40.73
31* 32.0000 (BF)
Image plane ∞
[Aspheric data]
Side 1 Side 2 Side 3 Side 4
K 0.00000 -0.49490 0.00000 0.00000
A4 4.47779E-06 4.43542E-06 4.77024E-07 4.15155E-06
A6 -6.78600E-09 2.25161E-10 2.09483E-09 3.89340E-09
A8 5.31922E-12 -9.29055E-12 -2.16305E-12 8.18814E-12
A10 -2.25307E-15 -1.18955E-14 0.00000E+00 1.49032E-14
A12 4.02202E-19 0.00000E+00 0.00000E+00 0.00000E+00
14th page 15th page 30th page 31st page
K 0.00000 0.00000 0.00000 0.00000
A4 -4.48844E-06 7.27005E-07 -8.26771E-06 1.29857E-05
A6 -1.56250E-09 -2.23592E-09 -6.11400E-08 -3.88053E-08
A8 -7.96852E-13 5.02688E-13 6.08894E-11 1.83629E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[Various data]
Zoom ratio 1.54
Wide Angle Mid Telephoto Focal Length 17.55 21.42 27.10
F-number 1.86 1.86 1.86
Full angle 2ω 105.33 90.39 74.48
Image height Y 21.63 21.63 21.63
Lens length 162.00 153.86 147.36
[Variable interval data]
Wide Angle Mid-Telephoto
d8 28.1863 15.8227 3.5000
d10 9.4442 9.7042 9.7043
d13 2.7601 2.5001 2.5000
d24 2.0815 4.0488 7.1822
BF 25.3738 27.6326 30.3206
[Lens group data]
Group Initial surface Focal length
G1 1 -27.42
G3 11 -77.33
G4 14 29.93
G5 25 -78.04
図４３は、本発明の実施例７のズームレンズのレンズ構成図である。 Figure 43 is a lens configuration diagram of a zoom lens according to the seventh embodiment of the present invention.
負の屈折力の第１レンズ群Ｇ１、正の屈折力の第２レンズ群Ｇ２、負の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、正の屈折力の第５レンズ群Ｇ５、負の屈折力の第６レンズ群Ｇ６より構成され、広角端から望遠端への変倍に際して各群の間隔が変化し、第１レンズ群Ｇ１は像側へ移動し、第２レンズ群Ｇ２から第６レンズ群Ｇ６の各群はいずれも物体側へ移動する構成となっている。開口絞りＳは第４レンズ群Ｇ４の像側に備えられ、変倍の際には第４レンズ群Ｇ４と一体で移動する。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３レンズ群Ｇ３が光軸に沿って物体側へ移動する。本実施例において、正の屈折力の中間レンズ群ＧＭは第２レンズ群Ｇ２と、第３レンズ群Ｇ３と、第４レンズ群Ｇ４と第５レンズ群Ｇ５より構成され、負の屈折力の後側レンズ群ＧＲは第６レンズ群Ｇ６に相当する。 The lens is composed of a first lens group G1 with negative refractive power, a second lens group G2 with positive refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, a fifth lens group G5 with positive refractive power, and a sixth lens group G6 with negative refractive power. When changing magnification from the wide-angle end to the telephoto end, the spacing between each group changes, the first lens group G1 moves toward the image side, and each group from the second lens group G2 to the sixth lens group G6 moves toward the object side. The aperture stop S is provided on the image side of the fourth lens group G4, and moves together with the fourth lens group G4 during magnification. When focusing from an object at infinity to a close object, the third lens group G3 moves toward the object side along the optical axis. In this embodiment, the middle lens group GM with positive refractive power is composed of the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5, and the rear lens group GR with negative refractive power corresponds to the sixth lens group G6.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と、物体側に凸面を向けた負メニスカスレンズＬ２と、物体側に凸面を向けた負メニスカスレンズＬ３と、物体側に凸面を向けた正メニスカスレンズＬ４より構成される。負メニスカスレンズＬ１の両面と、負メニスカスレンズＬ２の両面は所定の非球面形状となっている。 The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a negative meniscus lens L2 with a convex surface facing the object side, a negative meniscus lens L3 with a convex surface facing the object side, and a positive meniscus lens L4 with a convex surface facing the object side. Both surfaces of the negative meniscus lens L1 and both surfaces of the negative meniscus lens L2 have a predetermined aspheric shape.
第２レンズ群Ｇ２は、物体側に凸面を向けた正メニスカスレンズＬ５より構成される。 The second lens group G2 is composed of a positive meniscus lens L5 with its convex surface facing the object side.
第３レンズ群Ｇ３は、両凹レンズＬ６より構成される。 The third lens group G3 is composed of a biconcave lens L6.
第４レンズ群Ｇ４は、両凸レンズＬ７と、物体側に凸面を向けた負メニスカスレンズＬ８と両凸レンズＬ９からなる接合レンズと、開口絞りＳより構成される。両凸レンズＬ７の両面は所定の非球面形状となっている。 The fourth lens group G4 is composed of a biconvex lens L7, a cemented lens consisting of a negative meniscus lens L8 with its convex surface facing the object side and a biconvex lens L9, and an aperture stop S. Both surfaces of the biconvex lens L7 have a predetermined aspheric shape.
第５レンズ群Ｇ５は、物体側に凸面を向けた正メニスカスレンズＬ１０と、両凸レンズＬ１１と、物体側に凹面を向けた正メニスカスレンズＬ１２と物体側に凹面を向けた負メニスカスレンズＬ１３からなる接合レンズより構成される。 The fifth lens group G5 is composed of a cemented lens consisting of a positive meniscus lens L10 with a convex surface facing the object side, a biconvex lens L11, a positive meniscus lens L12 with a concave surface facing the object side, and a negative meniscus lens L13 with a concave surface facing the object side.
第６レンズ群Ｇ６は、両凹レンズＬ１４と物体側に凸面を向けた正メニスカスレンズＬ１５からなる接合レンズと、両凸レンズＬ１６と、両凹レンズＬ１７より構成される。両凹レンズＬ１７の両面は所定の非球面形状となっている。 The sixth lens group G6 is composed of a cemented lens consisting of a biconcave lens L14 and a positive meniscus lens L15 with its convex surface facing the object side, a biconvex lens L16, and a biconcave lens L17. Both surfaces of the biconcave lens L17 have a predetermined aspheric shape.
以下に実施例７に係るズームレンズの諸元値を示す。
数値実施例7
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1* 113.7839 3.1000 1.69350 53.20
2* 22.7511 14.0672
3* 297.3702 2.2000 1.59201 67.02
4* 44.4642 5.7998
5 252.5784 1.8000 1.59282 68.62
6 46.6209 0.1500
7 39.2377 3.9488 1.86966 20.02
8 74.2698 (d8)
9 52.2870 2.7867 1.77250 49.63
10 181.2553 (d10)
11 -56.5372 1.0000 1.61340 44.27
12 497.5389 (d12)
13* 52.1472 7.4650 1.85135 40.10
14* -77.5663 0.1500
15 357.4138 1.0000 1.91082 35.25
16 27.6271 8.4405 1.59282 68.62
17 -296.8704 2.5096
18(絞り) ∞ (d18)
19 46.6338 4.6056 1.45860 90.19
20 387.6855 0.1500
21 54.1825 7.7070 1.43700 95.10
22 -53.9145 0.1500
23 -236.1813 5.1173 1.55032 75.50
24 -33.0436 1.0000 1.90366 31.32
25 -64.6844 (d25)
26 -52.4700 1.0000 1.84666 23.78
27 30.9804 3.0598 1.55032 75.50
28 117.4594 0.1500
29 44.2453 5.2547 1.92286 20.88
30 -39.2230 0.1500
31* -289.3303 1.2000 1.80610 40.73
32* 33.0261 (BF)
像面 ∞
[非球面データ]
1面 2面 3面 4面
K 0.00000 -0.50269 0.00000 0.00000
A4 4.45258E-06 4.77889E-06 3.30700E-07 3.65022E-06
A6 -6.70629E-09 3.99937E-10 1.79544E-09 3.85637E-09
A8 5.31656E-12 -8.98783E-12 -2.09301E-12 8.32822E-12
A10 -2.25898E-15 -1.42622E-14 -7.00827E-16 1.69535E-14
A12 4.56752E-19 4.46314E-20 -9.03600E-19 6.80569E-18
13面 14面 31面 32面
K 0.00000 0.00000 0.00000 0.00000
A4 -4.03138E-06 2.78087E-07 -1.02086E-05 1.30304E-05
A6 -1.03260E-09 -1.60676E-09 -6.33936E-08 -3.58110E-08
A8 8.08733E-13 1.84742E-12 7.55080E-11 4.33151E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[各種データ]
ズーム比 1.64
広角 中間 望遠
焦点距離 16.50 21.11 27.10
Fナンバー 1.86 1.86 1.86
全画角2ω 109.30 91.25 74.48
像高Y 21.63 21.63 21.63
レンズ全長 161.94 152.71 146.76
[可変間隔データ]
広角 中間 望遠
d8 30.1232 14.9859 3.5000
d10 10.0906 9.6402 10.0901
d12 2.4995 2.9499 2.5000
d18 8.9443 9.1784 7.5414
d25 2.3043 4.8605 8.3947
BF 24.0120 27.1366 30.7767
[レンズ群データ]
群 始面 焦点距離
G1 1 -25.10
G2 9 94.24
G3 11 -82.71
G4 13 49.88
G5 19 41.46
G6 26 -81.69
The specifications of the zoom lens according to the seventh embodiment are shown below.
Numerical Example 7
Unit: mm
[Face data]
Surface number rd nd vd
Object surface ∞ (d0)
1* 113.7839 3.1000 1.69350 53.20
2* 22.7511 14.0672
3* 297.3702 2.2000 1.59201 67.02
4* 44.4642 5.7998
5 252.5784 1.8000 1.59282 68.62
6 46.6209 0.1500
7 39.2377 3.9488 1.86966 20.02
8 74.2698 (d8)
9 52.2870 2.7867 1.77250 49.63
10 181.2553 (d10)
11 -56.5372 1.0000 1.61340 44.27
12 497.5389 (d12)
13* 52.1472 7.4650 1.85135 40.10
14* -77.5663 0.1500
15 357.4138 1.0000 1.91082 35.25
16 27.6271 8.4405 1.59282 68.62
17 -296.8704 2.5096
18(Aperture) ∞ (d18)
19 46.6338 4.6056 1.45860 90.19
20 387.6855 0.1500
21 54.1825 7.7070 1.43700 95.10
22 -53.9145 0.1500
23 -236.1813 5.1173 1.55032 75.50
24 -33.0436 1.0000 1.90366 31.32
25 -64.6844 (d25)
26 -52.4700 1.0000 1.84666 23.78
27 30.9804 3.0598 1.55032 75.50
28 117.4594 0.1500
29 44.2453 5.2547 1.92286 20.88
30 -39.2230 0.1500
31* -289.3303 1.2000 1.80610 40.73
32* 33.0261 (BF)
Image plane ∞
[Aspheric data]
Side 1 Side 2 Side 3 Side 4
K 0.00000 -0.50269 0.00000 0.00000
A4 4.45258E-06 4.77889E-06 3.30700E-07 3.65022E-06
A6 -6.70629E-09 3.99937E-10 1.79544E-09 3.85637E-09
A8 5.31656E-12 -8.98783E-12 -2.09301E-12 8.32822E-12
A10 -2.25898E-15 -1.42622E-14 -7.00827E-16 1.69535E-14
A12 4.56752E-19 4.46314E-20 -9.03600E-19 6.80569E-18
13th 14th 31st 32nd
K 0.00000 0.00000 0.00000 0.00000
A4 -4.03138E-06 2.78087E-07 -1.02086E-05 1.30304E-05
A6 -1.03260E-09 -1.60676E-09 -6.33936E-08 -3.58110E-08
A8 8.08733E-13 1.84742E-12 7.55080E-11 4.33151E-11
A10 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
A12 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
[Various data]
Zoom ratio 1.64
Wide Angle Mid Telephoto Focal Length 16.50 21.11 27.10
F-number 1.86 1.86 1.86
Full angle 2ω 109.30 91.25 74.48
Image height Y 21.63 21.63 21.63
Lens length 161.94 152.71 146.76
[Variable interval data]
Wide Angle Mid-Telephoto
d8 30.1232 14.9859 3.5000
d10 10.0906 9.6402 10.0901
d12 2.4995 2.9499 2.5000
d18 8.9443 9.1784 7.5414
d25 2.3043 4.8605 8.3947
BF 24.0120 27.1366 30.7767
[Lens group data]
Group Initial surface Focal length
G1 1 -25.10
G3 11 -82.71
G4 13 49.88
G5 19 41.46
G6 26 -81.69
以下に上記の各実施例に対応する条件式対応値を示す。
[条件式対応値]
条件式／実施例 1 2 3 4 5 6 7
(1)2.8＜|f3|/√(fw×ft)＜6.5 3.9 4.8 3.7 3.3 4.2 3.5 3.9
(2) HIM/fw＞1.0 1.2 1.2 1.2 1.2 1.4 1.2 1.3
(3)0.9＜|f1|/√(fw×ft)＜2.0 1.3 1.3 1.4 1.2 1.4 1.3 1.2
(4) 1.15＜βRw＜2.00 1.45 1.48 1.31 1.41 1.29 1.43 1.37
(5) 0.1＜EXPt/LTt＜0.55 0.42 0.39 0.41 0.44 0.42 0.41 0.42
(6) βGMt＞-0.87 -0.64 -0.62 -0.67 -0.73 -0.68 -0.66 -0.74
The values of the conditional expressions corresponding to the above-mentioned respective embodiments are shown below.
[Conditional expression corresponding value]
Conditional formula/Example 1 2 3 4 5 6 7
(1) 2.8 < |f3|/√(fw×ft) < 6.5 3.9 4.8 3.7 3.3 4.2 3.5 3.9
(2) HIM/fw>1.0 1.2 1.2 1.2 1.2 1.4 1.2 1.3
(3) 0.9 < |f1|/√(fw × ft) < 2.0 1.3 1.3 1.4 1.2 1.4 1.3 1.2
(4) 1.15 < βRw < 2.00 1.45 1.48 1.31 1.41 1.29 1.43 1.37
(5) 0.1 < EXPt/LTt < 0.55 0.42 0.39 0.41 0.44 0.42 0.41 0.42
(6) βGMt＞-0.87 -0.64 -0.62 -0.67 -0.73 -0.68 -0.66 -0.74
Ｇ１ 第１レンズ群
Ｇ２ 第２レンズ群
Ｇ３ 第３レンズ群
Ｇ４ 第４レンズ群
Ｇ５ 第５レンズ群
Ｇ６ 第６レンズ群
ＧＭ 中間レンズ群ＧＭ
ＧＲ 後側レンズ群ＧＲ
Ｓ 開口絞り
Ｉ イメージャ
G1: first lens group G2: second lens group G3: third lens group G4: fourth lens group G5: fifth lens group G6: sixth lens group GM: intermediate lens group GM
GR Rear lens group GR
S Aperture stop I Imager
Claims (7)
前記中間レンズ群ＧＭは、物体側から順に、正の屈折力の第２レンズ群Ｇ２と、負の屈折力の第３レンズ群Ｇ３と、正の屈折力の第４レンズ群Ｇ４を少なくとも有し、開口絞りＳは前記第４レンズ群Ｇ４の内部または像側に配置され、
広角端から望遠端への変倍に際して各群の間隔が変化し、前記第１レンズ群Ｇ１と前記第２レンズ群Ｇ２の間隔は減少し、前記中間レンズ群ＧＭと前記後側レンズ群ＧＲはそれぞれ異なる軌跡で物体側へ移動し、
無限遠から近距離へのフォーカシングに際して前記第３レンズ群Ｇ３が光軸に沿って物体側へ移動し、以下の条件式（１）を満たすことを特徴とするズームレンズ。
（１） ２．８＜｜ｆ３｜／√（ｆｗ×ｆｔ）＜６．５
ただし、
ｆ３：前記第３レンズ群Ｇ３の焦点距離
ｆｗ：広角端、無限遠合焦状態における全系の焦点距離
ｆｔ：望遠端、無限遠合焦状態における全系の焦点距離
とする。 The optical system is configured, in order from the object side, of a first lens group G1 having a negative refractive power, a middle lens group GM having a positive refractive power as a whole, which is composed of three or four lens groups, and a rear lens group GR having a negative refractive power.
the intermediate lens group GM has, in order from the object side, at least a second lens group G2 having a positive refractive power, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power, an aperture stop S being disposed inside the fourth lens group G4 or on the image side thereof;
When zooming from the wide-angle end to the telephoto end, the distance between each group changes, the distance between the first lens group G1 and the second lens group G2 decreases, and the intermediate lens group GM and the rear lens group GR move toward the object side along different trajectories,
A zoom lens characterized in that the third lens group G3 moves toward the object side along the optical axis during focusing from infinity to a close distance, and the following conditional expression (1) is satisfied:
(1) 2.8<|f3|/√(fw×ft)<6.5
however,
f3: focal length of the third lens group G3, fw: focal length of the entire system at the wide-angle end and focused on infinity, ft: focal length of the entire system at the telephoto end and focused on infinity.
（２） ＨＩＭ／ｆｗ＞１．０
（３） ０．９＜｜ｆ１｜／√（ｆｗ×ｆｔ）＜２．０
ただし、
ＨＩＭ：最大像高
ｆｗ：広角端、無限遠合焦状態における全系の焦点距離
ｆｔ：望遠端、無限遠合焦状態における全系の焦点距離
ｆ１：前記第１レンズ群Ｇ１の焦点距離
とする。 2. The zoom lens according to claim 1, wherein the following conditional expressions (2) and (3) are satisfied:
(2) HIM/fw>1.0
(3) 0.9<|f1|/√(fw×ft)<2.0
however,
HIM: maximum image height, fw: focal length of the entire system at the wide-angle end and in the infinity focused state, ft: focal length of the entire system at the telephoto end and in the infinity focused state, f1: focal length of the first lens group G1.
（４） １．１５＜βＲｗ＜２．００
ただし、
βＲｗ：広角端、無限遠合焦状態における前記後側レンズ群ＧＲの結像倍率
とする。 3. The zoom lens according to claim 1, wherein the following conditional expression (4) is satisfied:
(4) 1.15<βRw<2.00
however,
βRw: the imaging magnification of the rear lens group GR at the wide-angle end and in a state where the lens is focused on an object at infinity.
（５） ０．１０＜ＥＸＰｔ／ＬＴｔ＜０．５５
ただし、
ＥＸＰｔ：望遠端、無限遠合焦状態における像面から射出瞳までの長さ
ＬＴｔ：望遠端、無限遠合焦状態における光学系の最も物体側の面から像面までの長さ
とする。 4. The zoom lens according to claim 1, wherein the following conditional expression (5) is satisfied:
(5) 0.10<EXPt/LTt<0.55
however,
EXPt: length from the image plane to the exit pupil at the telephoto end, in a state where the object is focused at infinity; LTt: length from the surface of the optical system closest to the object to the image plane at the telephoto end, in a state where the object is focused at infinity.
（６） βＧＭｔ＞－０．８７
ただし、
βＧＭｔ：望遠端、無限遠合焦状態における前記中間レンズ群ＧＭの結像倍率
とする。 5. The zoom lens according to claim 1, wherein the first lens group G1 moves along the optical axis during zooming from the wide-angle end to the telephoto end and is positioned closer to the image at the telephoto end than at the wide-angle end, and the following conditional expression (6) is satisfied:
(6) βGMt>-0.87
however,
βGMt: the imaging magnification of the intermediate lens group GM at the telephoto end, in a state where the lens is focused on an object at infinity.
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|---|---|---|---|
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|---|---|---|---|
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001318314A (en) | 2000-05-11 | 2001-11-16 | Canon Inc | Zoom lens and optical apparatus using it |
| WO2016194775A1 (en) | 2015-05-29 | 2016-12-08 | 株式会社ニコン | Variable magnification optical system, optical device, and manufacturing method for variable magnification optical system |
| JP2017122747A (en) | 2014-06-06 | 2017-07-13 | オリンパス株式会社 | Zoom lens and image pickup apparatus including the same |
| JP2019120822A (en) | 2018-01-09 | 2019-07-22 | キヤノン株式会社 | Zoom lens and imaging apparatus and imaging system having the same |
| JP2020170055A (en) | 2019-04-01 | 2020-10-15 | 株式会社ニコン | Zoom optical system, optical device, and method for manufacturing zoom optical system |
-
2021
- 2021-02-18 JP JP2021023909A patent/JP7504466B2/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001318314A (en) | 2000-05-11 | 2001-11-16 | Canon Inc | Zoom lens and optical apparatus using it |
| JP2017122747A (en) | 2014-06-06 | 2017-07-13 | オリンパス株式会社 | Zoom lens and image pickup apparatus including the same |
| WO2016194775A1 (en) | 2015-05-29 | 2016-12-08 | 株式会社ニコン | Variable magnification optical system, optical device, and manufacturing method for variable magnification optical system |
| JP2019120822A (en) | 2018-01-09 | 2019-07-22 | キヤノン株式会社 | Zoom lens and imaging apparatus and imaging system having the same |
| JP2020170055A (en) | 2019-04-01 | 2020-10-15 | 株式会社ニコン | Zoom optical system, optical device, and method for manufacturing zoom optical system |
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| JP2022126058A (en) | 2022-08-30 |
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