JP6199230B2 - Super wide-angle zoom lens - Google Patents
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Description
本発明は、スチルカメラ、ビデオカメラ等の撮像装置に用いる撮影レンズに好適な光学系に関し、オートフォーカスカメラに適したインナーフォーカス方式を採用し、またフォーカスレンズ群を光軸に沿う方向への微少な振動（ウオブリング）させた際の像高変化率が小さく、広角端での撮影画角が１２０度以上と広画角なズームレンズに関するものである。 The present invention relates to an optical system suitable for a photographic lens used in an imaging apparatus such as a still camera or a video camera, and employs an inner focus system suitable for an autofocus camera, and a focus lens group in a direction along the optical axis. The present invention relates to a zoom lens that has a small image height change rate when it is vibrated (wobbling) and has a wide field angle of 120 ° or more at the wide angle end.
ズームレンズのフォーカス方式は、物体側の第１群をそのまま繰出すフロントフォーカス方式が一般的である。しかしＡＦ化の要請から、第１群以外の比較的軽量なレンズ群でフォーカスを行うインナーフォーカス方式が望まれていた。このインナーフォーカス方式については近年数多く提案されているが、有限距離におけるズーミング時のピントずれを防ぐために補正カムを必要とし、機構が複雑になる問題を抱えていた。第１群以外のレンズ群でフォーカスを行うインナーフォーカス方式を採用した技術として特許文献１、２、３、４が開示されている。
A zoom lens focusing method is generally a front focusing method in which the first group on the object side is extended as it is. However, due to the demand for AF, an inner focus method in which focusing is performed with a relatively light lens group other than the first group has been desired. In recent years, there have been many proposals for this inner focus method, but a correction cam is required to prevent a focus shift during zooming at a finite distance, and the mechanism is complicated.
負の屈折力のレンズ群が先行するズームタイプは、広角ズームや超広角ズームに適したタイプである。しかし、第１レンズ群でフォーカスすることが多く、フォーカス群が重いためＡＦに支障をきたしていた。 The zoom type preceded by a lens unit having a negative refractive power is a type suitable for wide-angle zoom and ultra-wide-angle zoom. However, focusing is often performed with the first lens group, and the focus group is heavy, which hinders AF.
また、第１レンズ群の内部をフォーカスさせることにより、若干量の重量軽減を図っているものも見受けられるが、十分な軽量化はなされていない。このため、アクチュエータの縮小化や応答性・リアルタイム性の問題等を改善させるため、さらなるフォーカス群の重量軽減が必要とされていた。 Further, there are some lenses that achieve a slight weight reduction by focusing the inside of the first lens group, but the weight has not been reduced sufficiently. For this reason, in order to improve the downsizing of the actuator and the problems of responsiveness and real-time characteristics, it is necessary to further reduce the weight of the focus group.
また、近年台頭してきたミラーレス一眼カメラのオートフォーカスのように、フォーカスレンズ群を光軸に沿う方向へ微少な振動（ウオブリング）をさせ続けることで、常にフォーカス駆動方向を判断し続ける形式のインナーフォーカス方式が開発されてきた。その際、ウオブリング時の像高変化率が大きいと、鑑賞者が画面に映る被写体の倍率変動を認識し、目障りに感じてしまう。そのためフォーカス変化に対して像高変化率が小さいフォーカス形式が望まれていた。 In addition, like the auto focus of mirrorless interchangeable-lens cameras that have emerged in recent years, the focus lens group continues to be slightly oscillated (wobbling) in the direction along the optical axis, thereby constantly determining the focus drive direction. Focus methods have been developed. At that time, if the image height change rate during wobbling is large, the viewer recognizes the magnification change of the subject on the screen and feels it annoying. Therefore, a focus type having a small image height change rate with respect to the focus change has been desired.
ここで、所定の物体高を与えて、その物体に対応する合焦状態での像高をｙ、撮影距離と物体高とを変えずにフォーカスレンズ群を移動させて、ガウス像面が合焦状態の位置から光軸方向への移動をΔｓとするとΔｓ＝±０．０８ｍｍだけ移動した場合の像高をｙ′とする。Δｓ＝±０．０８ｍｍは、最小錯乱円の直径を０．０１ｍｍ、Ｆ値をＦ８とした場合の片側焦点深度に相当する。ここでは、次式で定義されるηを像高変化率と呼ぶことにする。
η＝（ｙ′−ｙ）／ｙ 参考式（１）
Here, given a predetermined object height, the image height in the focused state corresponding to the object is y, the focus lens group is moved without changing the shooting distance and the object height, and the Gaussian image plane is focused. When the movement in the optical axis direction from the position of the state is Δs, the image height when moving by Δs = ± 0.08 mm is y ′. Δs = ± 0.08 mm corresponds to the one-side depth of focus when the diameter of the minimum circle of confusion is 0.01 mm and the F value is F8. Here, η defined by the following equation is called an image height change rate.
η = (y′−y) / y Reference formula (1)
また、像高変化率ηの目標値に関しては、特開２００９−１２２６２０に以下の記述があり、本件発明はこの記述を参考に像高変化率ηの目標設定を行った。上記ガウス像面の移動量をΔｓとした時、段落［００６０］、［００６２］にて
「ここで、次のようにＥを定義する。
Ｅ＝η／Δｓ
種々の実験を行い、一般的な条件下で像高変化が目立たない条件は
｜Ｅ｜＜１／８
であり、最も厳しい条件下で像高変化が目立たない条件は、
｜Ｅ｜＜１／８０
であることがわかった。」
と開示しており、この記述からすると、Δｓ＝０．０８とした時の像高変化率ηの許容は、
｜η｜＝Ｅ×Δｓ
より、最も厳しい条件下で像高変化が目立たない条件は、
｜η｜＜０．００１（０．１％）
となり、本件発明はこの記述を参考に像高変化率ηの目標設定を行った。
Regarding the target value of the image height change rate η, Japanese Unexamined Patent Application Publication No. 2009-122620 has the following description, and the present invention sets the target of the image height change rate η with reference to this description. When the amount of movement of the Gaussian image plane is Δs, paragraphs [0060] and [0062] “Here, E is defined as follows.
E = η / Δs
Various experiments were conducted, and the condition under which the image height change was not noticeable under general conditions was | E | <1/8
The conditions under which the change in image height is not noticeable under the most severe conditions are
| E | <1/80
I found out that "
From this description, the allowable image height change rate η when Δs = 0.08 is
| Η | = E × Δs
The conditions under which the change in image height is not noticeable under the most severe conditions are
| Η | <0.001 (0.1%)
Therefore, the present invention sets the target of the image height change rate η with reference to this description.
特許文献１で開示されているズームレンズは、負の屈折力の第１群と正の屈折力の第２群より成り、双方のレンズ群を移動させて変倍を行う２群ズームレンズにおいて第１群を負の屈折力の２つのレンズ群に分け、このうち像面側の小型軽量の負の屈折力の第１２群を光軸上移動させてフォーカスを行うことにより、合焦操作の高速化を容易にした、広角端の撮影面角が約１１３度と広画角なズームレンズを達成するとされるが、フォーカス群は複数のレンズで構成される、全体として負の屈折力を持つレンズ群であるため、フォーカスレンズ群の重量軽減が十分ではない。
The zoom lens disclosed in
また、特許文献１の実施例１の広角端では、先に示した像高変化率ηの値は、最大像高２１．６３で０．５１％と大きく、さらに広角端の撮影画角が１１３度程しかない。
Further, at the wide angle end of Example 1 of
また、特許文献２で開示されているズームレンズは、物体側より順に負の屈折力の第１群、負の屈折力の第２群、そして正の屈折力の第３群の３つのレンズ群を有し、フォーカス群は小型軽量の第２群で行うことで、オートフォーカスを容易にしているが、この技術も特許文献１と同様にフォーカス群は複数のレンズで構成される全体として負の屈折力を持つレンズ群であるため、フォーカスレンズ群の重量軽減が十分ではない。
In addition, the zoom lens disclosed in
また、特許文献２の実施例１では、広角端での像高変化率ηは、最大像高２１．６３で０．２０％と大きく、さらに広角端の撮影画角が９３度程しかない。
In Example 1 of
さらに、特許文献３で開示されているズームレンズは、物体側から順に負負正正の４群で構成し、物体距離無限遠から近距離物体へフォーカシングする際、第３レンズ群Ｌ３が像面方向へ移動し、第３群のパワー、および第３、４群の倍率を適切に設定することで、インナーフォーカスに最適な広画角なズームレンズを得ることができるが、広角端の撮影画角が７８度程しかなく、撮影画角が十分ではない。
Further, the zoom lens disclosed in
また、特許文献４で開示されているレンズは、物体側より順に、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からなり、第１レンズ群Ｇ１は、負の屈折力の第１Ａレンズ群Ｇ１Ａ、負の屈折力の第１Ｂレンズ群Ｇ１Ｂで構成され、フォーカシングの際、第１Ｂレンズ群Ｇ１Ｂを物体側に移動させ、所定の条件式を満足させることにより、撮影画角が１２０度を超える超広角レンズ系でありながら、バックフォーカスが長く、イメージサークルが大きな３５ｍｍフォーマットの交換レンズに適した、フォーカシングによる収差変動が少なく、高性能な超広角レンズ系を提供している。
Further, the lens disclosed in
しかしこの技術も特許文献１、２と同様にフォーカス群は複数のレンズで構成される全体として負の屈折力を持つレンズ群であるため、フォーカスレンズ群の重量軽減が十分ではない。
However, in this technique as well, as in
特許文献４の実施例１は単焦点レンズであるが、像高変化率ηは最大像高２１．６３で−０．３７％と大きい。
Example 1 of
また、特許文献４のズームレンズである実施例２では、広角端での像高変化率ηは、最大像高２１．６３で−０．７％とさらに大きい課題がある。
In Example 2 which is a zoom lens disclosed in
本発明は上述した従来技術の課題に対してなされたものであり、パワー配置を適切に設定することによりフォーカスレンズ群を軽量化し、像高変化率の小さいインナーフォーカスに最適な、画角が１２０度を超える広画角なズームレンズの提供を目的とする。 The present invention has been made to solve the above-described problems of the prior art, and by appropriately setting the power arrangement, the focus lens group can be reduced in weight, and the angle of view is optimal for inner focus with a small image height change rate. The purpose is to provide a zoom lens with a wide angle of view that exceeds 100 degrees.
上記課題を解決するために第１の発明の超広角ズームレンズでは、物体側より順に負パワーの第１レンズ群Ｇ１、正パワーの単レンズからなる第２レンズ群Ｇ２、正パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４、負パワーの第５レンズ群Ｇ５で構成し、物体側無限遠から近距離物体へフォーカシングする際、第２レンズ群Ｇ２が像面方向へ移動し、以下の条件を満足することとした。
（１）５．０＜ｆ２／ｆｗ＜４０．０
（２）０．４＜１／（ＭＲＴ＾２×（Ｍ２Ｔ＾２−１））
ただし、
ｆｗ：ワイド端無限遠時の焦点距離
ｆ２：第２レンズ群の焦点距離
Ｍ２Ｔ：物体距離無限遠時の望遠端の第２レンズ群の倍率負担
ＭＲＴ：物体距離無限遠時の望遠端の第３レンズ群から第５レンズ群までの合成倍率負担
In order to solve the above-described problem, in the super wide-angle zoom lens according to the first aspect of the invention, in order from the object side, the first lens group G1 having negative power, the second lens group G2 including a single lens having positive power, and the third lens having positive power Consists of a group G3, a fourth lens group G4 with positive power, and a fifth lens group G5 with negative power. When focusing from an object side infinity to a close object, the second lens group G2 moves in the image plane direction. This condition was satisfied.
(1) 5.0 <f2 / fw <40.0
(2) 0.4 <1 / (MRT ^ 2 × (M2T ^ 2-1))
However,
fw: focal length at the wide end infinity f2: focal length of the second lens group M2T: magnification burden of the second lens group at the telephoto end when the object distance is infinity MRT: third telephoto end at the object distance infinity Composite magnification burden from the lens group to the fifth lens group
また、第２の発明の超広角ズームレンズでは、第１の発明においてさらに、第２レンズ群Ｇ２の物体側の面を基準とし、広角端の第２レンズ群Ｇ２から絞りの前までの面の合成光学系による絞りの像位置をＦｃＥｎｔｐとした時、以下の条件を満足することとした。
（３）０．１＜ＦｃＥｎｔｐ／ｆ２＜０．７
（４）２．５＜ＦｃＥｎｔｐ／ｆｗ
In the super wide-angle zoom lens according to the second aspect of the invention, the surface of the second lens group G2 from the second lens group G2 at the wide-angle end to the front of the stop is further defined with reference to the object side surface of the second lens group G2. When the image position of the stop by the combining optical system is FcEntp, the following conditions are satisfied.
(3) 0.1 <FcEntp / f2 <0.7
(4) 2.5 <FcEntp / fw
また、第３の発明の超広角ズームレンズでは、第１乃至第２の発明においてさらに、変倍時において第１レンズ群Ｇ１が像面に対し固定であることとした。 In the super wide-angle zoom lens according to the third aspect of the present invention, the first lens group G1 is fixed with respect to the image plane during zooming in the first and second aspects of the invention.
本発明によれば、パワー配置を適切に設定することによりフォーカスレンズ群を軽量化し、像高変化率の小さいインナーフォーカスに最適な、画角が１２０度を超える広画角なズームレンズを提供することができる。 According to the present invention, a focus lens group is reduced in weight by appropriately setting a power arrangement, and a zoom lens having a wide angle of view exceeding 120 degrees and optimal for inner focus with a small image height change rate is provided. be able to.
本発明に係る超広角ズームレンズは、物体側より順に負パワーの第１レンズ群Ｇ１、正パワーの単レンズからなる第２レンズ群Ｇ２、正パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４、負パワーの第５レンズ群Ｇ５で構成され、物体側無限遠から近距離物体へフォーカシングする際、第２レンズ群Ｇ２が像面方向へ移動する構成となっている。 The super wide-angle zoom lens according to the present invention includes, in order from the object side, a first lens group G1 having negative power, a second lens group G2 including a single lens having positive power, a third lens group G3 having positive power, and a fourth lens having positive power. The lens group G4 and the negative power fifth lens group G5 are configured such that the second lens group G2 moves in the image plane direction when focusing from an object-side infinity to a short-distance object.
本実施形態に係る超広角ズームレンズでは、物体側無限遠から近距離物体へフォーカシングする際、単レンズである第２レンズ群Ｇ２が像面方向へ移動することで、フォーカシングに係るアクチュエータへの負荷が少なく、高速なフォーカシング動作を実現し、またフォーカシングによる像高変動を微小にすることができる。また、第２レンズ群Ｇ２を正パワーの単レンズにすることにより、フォーカシングに係るアクチュエータを小型にすることができ、全体の光学系をコンパクトにすることが可能となる。 In the super wide-angle zoom lens according to the present embodiment, when focusing from an object side infinity to a close object, the second lens group G2, which is a single lens, moves in the image plane direction, so that the load on the actuator related to focusing is reduced. Therefore, it is possible to realize a high-speed focusing operation with a small amount, and to reduce the fluctuation in image height due to the focusing. Further, by making the second lens group G2 a single lens of positive power, the focusing actuator can be made compact, and the entire optical system can be made compact.
また、高速な合焦動作、光学系の小型化を実現するため、ワイド端無限遠時の焦点距離をｆｗ、第２レンズ群の焦点距離をｆ２とした時、以下の条件式を満足することを特徴とする。
（１）５．０＜ｆ２／ｆｗ＜４０．０
ただし、
ｆｗ：ワイド端無限遠時の焦点距離
ｆ２：第２レンズ群の焦点距離
Also, in order to realize high-speed focusing operation and downsizing of the optical system, when the focal length at the wide end infinity is fw and the focal length of the second lens group is f2, the following conditional expression must be satisfied: It is characterized by.
(1) 5.0 <f2 / fw <40.0
However,
fw: focal length at wide end infinity f2: focal length of second lens group
また、ＡＦ合焦範囲内にフォーカスレンズ群である第２レンズ群を駆動制御するためには、第２レンズ群、および、第２レンズ群以降の倍率負担を規定することが重要になり、物体距離無限遠時の望遠端の第２レンズ群の倍率負担をＭ２Ｔ、物体距離無限遠時の望遠側の第３レンズ群から第５レンズ群までの合成倍率負担ＭＲＴとした時、以下の条件式を満足することを特徴としている。
（２）０．４＜１／（ＭＲＴ＾２×（Ｍ２Ｔ＾２−１））
ただし、
Ｍ２Ｔ：物体距離無限遠時の望遠端の第２レンズ群の倍率負担
ＭＲＴ：物体距離無限遠時の望遠端の第３レンズ群から第５レンズ群までの合成倍率負担
In addition, in order to drive and control the second lens group, which is the focus lens group, within the AF focusing range, it is important to define the magnification burden for the second lens group and the second lens group and subsequent objects. When the magnification burden of the second lens group at the telephoto end at the infinite distance is M2T and the combined magnification burden MRT from the third lens group on the telephoto side to the fifth lens group at the object distance infinite is MRT, the following conditional expression It is characterized by satisfying.
(2) 0.4 <1 / (MRT ^ 2 × (M2T ^ 2-1))
However,
M2T: magnification burden of the second lens group at the telephoto end when the object distance is infinity MRT: synthetic magnification burden from the third lens group to the fifth lens group at the telephoto end when the object distance is infinity
また、第２の発明では、ウオブリングによる像高変動を抑制することを目的としている。ウオブリングによる像高変動は、ウオブリングによる歪曲収差の変動で表すことができる。 Further, the second invention aims to suppress image height fluctuations due to wobbling. Image height variation due to wobbling can be represented by variation in distortion due to wobbling.
松居吉哉著、レンズ設計法、共立出版Ｐ８８によれば３次の歪曲収差係数Ｖは以下の式であらわされる。
Ｖ＝Ｊ・ＩＶ
これを展開すると以下になり、
Ｖ＝（Ｈ’・Ｑ’）＾３／（Ｈ・Ｑ）・Ｈ＾２・Δ（１／（ｎ・ｓ））＋Ｐ・（Ｈ’ｈ・Ｑ’）／（Ｈ・Ｑ） 参考式（２）
３次の歪曲収差係数Ｖは近軸主光線高Ｈ’の３乗に比例する。
According to Yoshiya Matsui, lens design method, Kyoritsu Shuppan P88, the third-order distortion coefficient V is expressed by the following equation.
V = J ・ IV
When expanded, it becomes the following,
V = (H ′ · Q ′) ^ 3 / (H · Q) · H ^ 2 · Δ (1 / (n · s)) + P · (H′h · Q ′) / (H · Q) Reference equation (2)
The third-order distortion coefficient V is proportional to the cube of the paraxial principal ray height H ′.
これより、ウオブリングによる歪曲収差の変動を少なくするには、ウオブリングによるフォーカスレンズ群の主光線高の変動を少なくすればよい。 Accordingly, in order to reduce the variation in distortion due to the wobbling, the variation in the principal ray height of the focus lens group due to the wobbling may be reduced.
ここで、物体距離無限遠時のフォーカスレンズ群による絞りの像の位置、およびフォーカスレンズ群である第２レンズ群の倍率負担、フォーカスレンズ群より後方のレンズ群である第３レンズ群から第５レンズ群までの合成倍率負担、およびフォーカスレンズ群における主光線高から、ウオブリングによるフォーカスレンズ群の主光線高の変動Δｈは以下の式で表される。
Δｈ＝ｈ’−ｈ＝ｈ・Δｓ／（ＦｃＥｎｔｐ×ＭＲ＾２×（Ｍ２＾２−１）） 参考式（３）
ただし、
ＦｃＥｎｔｐ：物体距離無限遠時の広角端の第２レンズ群Ｇ２から絞りの前までの面の合成光学系による絞りの像位置
Δｓ：ウオブリング時の像面移動量
ｈ：物体距離無限遠時のフォーカスレンズ群における主光線高
ｈ’：ウオブリング時のフォーカスレンズ群における主光線高
Ｍ２：物体距離無限遠時の第２レンズ群の倍率負担
ＭＲ：物体距離無限遠時の第３レンズ群から第５レンズ群までの合成倍率負担
Here, the position of the aperture image by the focus lens group at the infinite object distance, the magnification burden of the second lens group that is the focus lens group, the third lens group that is the lens group behind the focus lens group, and the fifth lens group. From the combined magnification burden up to the lens group and the principal ray height in the focus lens group, the fluctuation Δh of the principal ray height of the focus lens group due to wobbling is expressed by the following equation.
Δh = h′−h = h · Δs / (FcEntp × MR ^ 2 × (M2 ^ 2-1)) Reference formula (3)
However,
FcEntp: Image position of the aperture by the combining optical system of the surface from the second lens group G2 at the wide-angle end to the front of the aperture when the object distance is infinity. The principal ray height h ′ in the lens group: the principal ray height M2 in the focus lens group at the time of wobbling: the magnification burden of the second lens group when the object distance is infinity MR: the third to fifth lenses when the object distance is infinity Composite magnification burden to group
このため、主光線高の変動を少なくするには、物体距離無限遠時のフォーカスレンズ群による絞りの像の位置を大きくすればよいことがわかる。 For this reason, in order to reduce the fluctuation of the chief ray height, it is understood that the position of the aperture image by the focus lens group when the object distance is infinite may be increased.
したがって、第２の発明では、フォーカスレンズ群である第２レンズ群Ｇ２の物体側の面を基準とし、広角端の第２レンズ群Ｇ２から絞りの前までの面の合成光学系による絞りの像位置をＦｃＥｎｔｐとした時、以下の条件を満足することで達成される。
（３）０．１＜ＦｃＥｎｔｐ／ｆ２＜０．７
（４）２．５＜ＦｃＥｎｔｐ／ｆｗ
Therefore, according to the second aspect of the invention, the image of the stop by the combining optical system of the surface from the second lens group G2 at the wide-angle end to the front of the stop with reference to the object side surface of the second lens group G2 that is the focus lens group. This is achieved by satisfying the following conditions when the position is FcEntp.
(3) 0.1 <FcEntp / f2 <0.7
(4) 2.5 <FcEntp / fw
また、変倍時において第１レンズ群が像面に対し固定であっても、移動してもよい。 Further, at the time of zooming, the first lens group may be fixed or moved with respect to the image plane.
以下、本発明の条件式について説明する。 Hereinafter, conditional expressions of the present invention will be described.
条件式（１）は、フォーカスレンズ群である第２レンズ群の焦点距離を規定し、高速な合焦動作、光学系の小型化を実現するための条件である。条件式（１）の下限を超え第２レンズ群Ｇ２の焦点距離ｆ２が短くなると、フォーカスのための繰出し量が短くなりすぎ、正確な合焦位置でフォーカスレンズ群を停止させることが困難になる。 Conditional expression (1) defines the focal length of the second lens group, which is the focus lens group, and is a condition for realizing high-speed focusing operation and downsizing of the optical system. When the lower limit of conditional expression (1) is exceeded and the focal length f2 of the second lens group G2 is shortened, the amount of extension for focusing becomes too short, and it becomes difficult to stop the focus lens group at an accurate in-focus position. .
また条件式（１）の上限を超え第２レンズ群Ｇ２の焦点距離ｆ２が長くなると、フォーカスのための繰出し量が長くなり、第２レンズ群と第３レンズ群との間のスペース確保が困難になりズーム比がかせげない。またコンパクト化に不利なため、フィルター径が大きくなる。なお、条件式（１）について、その下限値をさらに１０に、また、上限値をさらに２５．６とすることで、前述の効果をより確実にすることができる。 If the upper limit of conditional expression (1) is exceeded and the focal length f2 of the second lens group G2 is increased, the amount of extension for focusing becomes longer, and it is difficult to secure a space between the second lens group and the third lens group. The zoom ratio is inevitable. Moreover, since it is disadvantageous for compactization, a filter diameter becomes large. Regarding conditional expression (1), the lower limit value is further set to 10 and the upper limit value is further set to 25.6, so that the above-described effect can be further ensured.
条件式（２）は第２レンズ群Ｇ２がフォーカス時に移動した時の結像面の敏感度を規定する。条件式（２）の下限を超えると、フォーカスレンズ群の移動量が少なくなるため、フォーカスレンズ群の微少な動きで結像面が大きく動き、ＡＦ合焦範囲内にフォーカスレンズ群である第２レンズ群Ｇ２を駆動制御することが困難になる。なお、条件式（２）について、その下限値をさらに０．５４とすることで、前述の効果をより確実にすることができる。 Conditional expression (2) defines the sensitivity of the image plane when the second lens group G2 moves during focusing. If the lower limit of conditional expression (2) is exceeded, the amount of movement of the focus lens group decreases, so that the image plane moves greatly due to a slight movement of the focus lens group, and the second focus lens group is within the AF focusing range. It becomes difficult to drive and control the lens group G2. In addition, regarding the conditional expression (2), when the lower limit value is further set to 0.54, the above-described effect can be further ensured.
条件式（３）、（４）は、併せてウオブリング時の像高変動を抑制させるための条件である。条件式（３）の下限を超え、広角端の第２レンズ群Ｇ２から絞りの前までの面の合成光学系による絞りの像位置までの距離が小さくなると、ウオブリング時のフォーカスレンズ群の主光線高の変動が大きくなるため、ウオブリング時の像高変動を抑制することが困難になる。 Conditional expressions (3) and (4) are conditions for suppressing fluctuations in image height during wobbling. If the lower limit of conditional expression (3) is exceeded and the distance from the second lens group G2 at the wide-angle end to the image position of the stop by the combining optical system on the surface before the stop becomes small, the chief ray of the focus lens group during wobbling Since the fluctuation of the height becomes large, it becomes difficult to suppress the fluctuation of the image height during wobbling.
また、条件式（３）の上限を超え、広角端の第２レンズ群Ｇ２から絞りの前までの面の合成光学系による絞りの像位置までの距離が大きくなると、フォーカスレンズ群から絞りまでの距離が大きくなるため、広角端の光学全長が長くなり、フィルター径の増大や周辺光量を確保することが困難になる。また第２レンズ群Ｇ２の焦点距離が短くなると、第１、第２レンズ群の合成系の負の屈折力が弱くなるため、バックフォーカスが短くなり、一眼レフレックスカメラに装着使用する際のクイックリターンミラーへの干渉抑制が困難になる。なお、条件式（３）について、その下限値をさらに０．１６に、また、上限値をさらに０．５５とすることで、前述の効果をより確実にすることができる。 If the distance from the second lens group G2 at the wide-angle end to the front of the stop increases beyond the upper limit of the conditional expression (3) and the image position of the stop by the combining optical system increases, the distance from the focus lens group to the stop is increased. Since the distance becomes large, the optical total length at the wide angle end becomes long, and it becomes difficult to increase the filter diameter and to secure the peripheral light amount. Also, if the focal length of the second lens group G2 is shortened, the negative refractive power of the composite system of the first and second lens groups is weakened, so that the back focus is shortened, and quick use when mounted on a single-lens reflex camera is used. It becomes difficult to suppress interference with the return mirror. Regarding conditional expression (3), the lower limit value is further set to 0.16, and the upper limit value is further set to 0.55, whereby the above-described effect can be further ensured.
また、条件式（４）の下限を超え、広角端の第２レンズ群Ｇ２から絞りの前までの面の合成光学系による絞りの像位置までの距離が小さくなると、ウオブリング時のフォーカスレンズ群の主光線高の変動が大きくなるため、ウオブリング時の像高変動を抑制することが困難になる。なお、条件式（４）について、その下限値をさらに３．７３とすることで、前述の効果をより確実にすることができる。 When the lower limit of conditional expression (4) is exceeded and the distance from the second lens group G2 at the wide-angle end to the image position of the stop by the combining optical system on the surface from the front to the stop becomes small, the focus lens group at the time of wobbling is reduced. Since the variation in chief ray height becomes large, it becomes difficult to suppress the variation in image height during wobbling. In addition, regarding the conditional expression (4), when the lower limit value is further set to 3.73, the above-described effect can be further ensured.
次に、本発明の結像光学系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, a lens configuration of an example according to the imaging optical system of the present invention will be described. In the following description, the lens configuration is described in order from the object side to the image side.
図１は、本発明の実施例１の結像光学系の広角端で無限遠合焦時のレンズ構成図である。物体側より順に負パワーの第１レンズ群Ｇ１、正パワーの単レンズからなる第２レンズ群Ｇ２、正パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４、負パワーの第５レンズ群Ｇ５で構成される。 FIG. 1 is a lens configuration diagram when focusing on infinity at the wide angle end of the imaging optical system according to Example 1 of the present invention. In order from the object side, the first lens group G1 with negative power, the second lens group G2 composed of a single lens with positive power, the third lens group G3 with positive power, the fourth lens group G4 with positive power, and the fifth lens with negative power. It consists of 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、両側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、両側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、両側の面は非球面形状で両凹の負レンズ、物体側に凸面を向けた正メニスカスレンズから成る。 The first lens group G1 is a negative meniscus lens having a convex surface facing the object side, a negative meniscus lens having aspherical surfaces on both sides and a convex surface facing the object side, and both surfaces are aspherical and convex on the object side. The negative meniscus lens is directed to a negative meniscus lens having an aspherical shape on both sides and a positive meniscus lens having a convex surface facing the object side.
また、第２レンズ群Ｇ２は、両凸レンズで構成される。 The second lens group G2 is composed of a biconvex lens.
また、第３レンズ群Ｇ３は、物体側に凸面を向けた正メニスカスレンズ、開口絞り、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の負レンズ、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズから成る。 The third lens group G3 includes a positive meniscus lens having a convex surface directed toward the object side, an aperture stop, a cemented negative lens including a biconvex lens and a negative meniscus lens having a concave surface directed toward the object side, and the biconvex lens and the object side. It consists of a cemented positive lens consisting of a negative meniscus lens with a concave surface.
また、第４レンズ群Ｇ４は、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズ、両凸レンズから成る。 The fourth lens group G4 is composed of a cemented positive lens and a biconvex lens each composed of a biconvex lens and a negative meniscus lens having a concave surface directed toward the object side.
また、第５レンズ群Ｇ５は、物体側に凸面を向けた負メニスカスレンズと物体側に凸面を向けた正メニスカスレンズとから成る接合の負レンズ、物体側に凹面を向けた正メニスカスレンズ、物体側に凹面を向け、物体側の面に樹脂の層が形成されており、その物体側の面は非球面からなる正メニスカスレンズから成る。 The fifth lens group G5 includes a cemented negative lens including a negative meniscus lens having a convex surface directed toward the object side and a positive meniscus lens having a convex surface directed toward the object side, a positive meniscus lens having a concave surface directed toward the object side, and an object A concave surface is directed to the side, and a resin layer is formed on the object side surface. The object side surface is formed of a positive meniscus lens formed of an aspherical surface.
図６は、本発明の実施例２の結像光学系の広角端で無限遠合焦時のレンズ構成図である。物体側より順に負パワーの第１レンズ群Ｇ１、正パワーの単レンズからなる第２レンズ群Ｇ２、正パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４、負パワーの第５レンズ群Ｇ５で構成される。 FIG. 6 is a lens configuration diagram at the wide-angle end of the imaging optical system according to Example 2 of the present invention when focusing on infinity. In order from the object side, the first lens group G1 with negative power, the second lens group G2 composed of a single lens with positive power, the third lens group G3 with positive power, the fourth lens group G4 with positive power, and the fifth lens with negative power. It consists of 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、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で両凹の負レンズ、物体側に凸面を向けた正メニスカスレンズから成る。 The first lens group G1 includes a negative meniscus lens having a convex surface facing the object side, an object-side surface having an aspheric shape and a negative meniscus lens having a convex surface facing the object side, and the object-side surface having an aspheric shape facing the object side A negative meniscus lens having a convex surface, an object-side surface having an aspherical shape and a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
また、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で構成される。 The second lens group G2 includes a positive meniscus lens having a convex surface directed toward the object side.
また、第３レンズ群Ｇ３は、両凸レンズ、開口絞り、両凸レンズと両凹レンズとから成る接合の負レンズ、物体側に凹面を向けた正メニスカスレンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズから成る。 The third lens group G3 includes a biconvex lens, an aperture stop, a cemented negative lens composed of a biconvex lens and a biconcave lens, a positive meniscus lens having a concave surface on the object side, and a negative meniscus lens having a concave surface on the object side. It consists of a cemented positive lens.
また、第４レンズ群Ｇ４は、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズ、両凸レンズから成る。 The fourth lens group G4 is composed of a cemented positive lens and a biconvex lens each composed of a biconvex lens and a negative meniscus lens having a concave surface directed toward the object side.
また、第５レンズ群Ｇ５は、両凹レンズと物体側に凸面を向けた正メニスカスレンズとから成る接合の負レンズ、両凸レンズ、物体側に凹面を向け、物体側の面に樹脂の層が形成されており、その物体側の面は非球面からなる正メニスカスレンズから成る。 The fifth lens group G5 includes a cemented negative lens composed of a biconcave lens and a positive meniscus lens having a convex surface facing the object side, a biconvex lens, a concave surface facing the object side, and a resin layer formed on the object side surface. The object side surface is composed of an aspherical positive meniscus lens.
図１１は、本発明の実施例３の結像光学系の広角端で無限遠合焦時のレンズ構成図である。物体側より順に負パワーの第１レンズ群Ｇ１、正パワーの単レンズからなる第２レンズ群Ｇ２、正パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４、負パワーの第５レンズ群Ｇ５で構成される。 FIG. 11 is a lens configuration diagram at the wide-angle end of the imaging optical system according to Example 3 of the present invention when focusing on infinity. In order from the object side, the first lens group G1 with negative power, the second lens group G2 composed of a single lens with positive power, the third lens group G3 with positive power, the fourth lens group G4 with positive power, and the fifth lens with negative power. It consists of 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、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で両凹の負レンズ、両凸レンズから成る。 The first lens group G1 includes a negative meniscus lens having a convex surface facing the object side, an object-side surface having an aspheric shape and a negative meniscus lens having a convex surface facing the object side, and the object-side surface having an aspheric shape facing the object side A negative meniscus lens having a convex surface and an object-side surface having an aspherical shape, a biconcave negative lens, and a biconvex lens.
また、第２レンズ群Ｇ２は、両凸レンズで構成される。 The second lens group G2 is composed of a biconvex lens.
また、第３レンズ群Ｇ３は、両凸レンズ、開口絞り、両凸レンズと両凹レンズとから成る接合の負レンズ、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズから成る。 The third lens group G3 is composed of a biconvex lens, an aperture stop, a cemented negative lens composed of a biconvex lens and a biconcave lens, and a cemented positive lens composed of a biconvex lens and a negative meniscus lens having a concave surface facing the object side. .
また、第４レンズ群Ｇ４は、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズ、両凸レンズから成る。 The fourth lens group G4 is composed of a cemented positive lens and a biconvex lens each composed of a biconvex lens and a negative meniscus lens having a concave surface directed toward the object side.
また、第５レンズ群Ｇ５は、物体側に凸面を向けた負メニスカスレンズと両凸レンズとから成る接合の負レンズ、物体側に凹面を向けた正メニスカスレンズ、物体側に凹面を向け、物体側の面に樹脂の層が形成されており、その物体側の面は非球面からなる正メニスカスレンズから成る。 The fifth lens group G5 includes a cemented negative lens composed of a negative meniscus lens having a convex surface facing the object side and a biconvex lens, a positive meniscus lens having a concave surface facing the object side, and a concave surface facing the object side. A resin layer is formed on the surface, and the object-side surface is composed of an aspherical positive meniscus lens.
図１６は、本発明の実施例４の結像光学系の広角端で無限遠合焦時のレンズ構成図である。物体側より順に負パワーの第１レンズ群Ｇ１、正パワーの単レンズからなる第２レンズ群Ｇ２、正パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４、負パワーの第５レンズ群Ｇ５で構成される。 FIG. 16 is a lens configuration diagram at the wide-angle end of the imaging optical system according to Example 4 of the present invention when focusing on infinity. In order from the object side, the first lens group G1 with negative power, the second lens group G2 composed of a single lens with positive power, the third lens group G3 with positive power, the fourth lens group G4 with positive power, and the fifth lens with negative power. It consists of 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、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で両凹の負レンズ、両凸レンズから成る。 The first lens group G1 includes a negative meniscus lens having a convex surface facing the object side, an object-side surface having an aspheric shape and a negative meniscus lens having a convex surface facing the object side, and the object-side surface having an aspheric shape facing the object side A negative meniscus lens having a convex surface and an object-side surface having an aspherical shape, a biconcave negative lens, and a biconvex lens.
また、第２レンズ群Ｇ２は、両凸レンズで構成される。 The second lens group G2 is composed of a biconvex lens.
また、第３レンズ群Ｇ３は、両凸レンズ、開口絞り、両凸レンズと両凹レンズとから成る接合の負レンズ、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズから成る。 The third lens group G3 is composed of a biconvex lens, an aperture stop, a cemented negative lens composed of a biconvex lens and a biconcave lens, and a cemented positive lens composed of a biconvex lens and a negative meniscus lens having a concave surface facing the object side. .
また、第４レンズ群Ｇ４は、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズ、両凸レンズから成る。 The fourth lens group G4 is composed of a cemented positive lens and a biconvex lens each composed of a biconvex lens and a negative meniscus lens having a concave surface directed toward the object side.
また、第５レンズ群Ｇ５は、物体側に凸面を向けた負メニスカスレンズと両凸レンズとから成る接合の正レンズ、物体側の面は非球面形状で物体側に凹面を向けた負メニスカスレンズから成る。 The fifth lens group G5 includes a cemented positive lens composed of a negative meniscus lens having a convex surface facing the object side and a biconvex lens, and a negative meniscus lens having an aspheric surface on the object side and a concave surface facing the object side. Become.
図２１は、本発明の実施例５の結像光学系の広角端で無限遠合焦時のレンズ構成図である。物体側より順に負パワーの第１レンズ群Ｇ１、正パワーの単レンズからなる第２レンズ群Ｇ２、正パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４、負パワーの第５レンズ群Ｇ５で構成される。 FIG. 21 is a lens configuration diagram at the wide-angle end of the imaging optical system according to Example 5 of the present invention when focusing on infinity. In order from the object side, the first lens group G1 with negative power, the second lens group G2 composed of a single lens with positive power, the third lens group G3 with positive power, the fourth lens group G4 with positive power, and the fifth lens with negative power. It consists of group G5.
第１レンズ群Ｇ１Ｇ１は、物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で両凹の負レンズ、両凸レンズから成る。 The first lens group G1G1 is a negative meniscus lens having a convex surface facing the object side, a negative meniscus lens having an aspheric surface on the object side and a convex surface facing the object side, and a surface having an aspheric surface on the object side. A negative meniscus lens having a convex surface and an object-side surface having an aspherical shape, a biconcave negative lens, and a biconvex lens.
また、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で構成される。 The second lens group G2 includes a positive meniscus lens having a convex surface directed toward the object side.
また、第３レンズ群Ｇ３は、両凸レンズ、開口絞り、両凸レンズと両凹レンズとから成る接合の負レンズ、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズから成る。 The third lens group G3 is composed of a biconvex lens, an aperture stop, a cemented negative lens composed of a biconvex lens and a biconcave lens, and a cemented positive lens composed of a biconvex lens and a negative meniscus lens having a concave surface facing the object side. .
また、第４レンズ群Ｇ４は、物体側に凹面を向けた正メニスカスレンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズ、両凸レンズから成る。 The fourth lens group G4 includes a cemented positive lens and a biconvex lens including a positive meniscus lens having a concave surface directed toward the object side and a negative meniscus lens having a concave surface directed toward the object side.
また、第５レンズ群Ｇ５は、物体側に凸面を向けた負メニスカスレンズと像側の面は非球面の両凸レンズとから成る接合の負レンズから成る。 The fifth lens group G5 is composed of a cemented negative lens including a negative meniscus lens having a convex surface directed toward the object side and a biconvex lens having an aspheric surface on the image side.
図２６は、本発明の実施例６の結像光学系の広角端で無限遠合焦時のレンズ構成図である。物体側より順に負パワーの第１レンズ群Ｇ１、正パワーの単レンズからなる第２レンズ群Ｇ２、正パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４、負パワーの第５レンズ群Ｇ５で構成され、変倍時に第１レンズ群は像面に対し固定である。 FIG. 26 is a lens configuration diagram at the wide-angle end of the imaging optical system according to Example 6 of the present invention when focusing on infinity. In order from the object side, the first lens group G1 with negative power, the second lens group G2 composed of a single lens with positive power, the third lens group G3 with positive power, the fourth lens group G4 with positive power, and the fifth lens with negative power. Consists of a group G5, and the first lens group is fixed with respect to the image plane during zooming.
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、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で両凹の負レンズ、物体側に凸面を向けた正メニスカスレンズから成る。 The first lens group G1 includes a negative meniscus lens having a convex surface facing the object side, an object-side surface having an aspheric shape and a negative meniscus lens having a convex surface facing the object side, and the object-side surface having an aspheric shape facing the object side A negative meniscus lens having a convex surface, an object-side surface having an aspherical shape and a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
また、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で構成される。 The second lens group G2 includes a positive meniscus lens having a convex surface directed toward the object side.
また、第３レンズ群Ｇ３は、物体側に凸面を向けた正メニスカスレンズ、開口絞り、両凸レンズと両凹レンズとから成る接合の負レンズ、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズから成る。 The third lens group G3 includes a positive meniscus lens having a convex surface facing the object side, an aperture stop, a cemented negative lens composed of a biconvex lens and a biconcave lens, a negative meniscus lens having a concave surface facing the object side and the biconvex lens, It consists of a cemented positive lens.
また、第４レンズ群Ｇ４は、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズ、両凸レンズから成る。 The fourth lens group G4 is composed of a cemented positive lens and a biconvex lens each composed of a biconvex lens and a negative meniscus lens having a concave surface directed toward the object side.
また、第５レンズ群Ｇ５は、物体側に凸面を向けた負メニスカスレンズと両凸レンズとから成る接合の負レンズ、物体側の面は非球面形状で物体側に凹面を向けた負メニスカスレンズから成る。 The fifth lens group G5 includes a cemented negative lens composed of a negative meniscus lens having a convex surface facing the object and a biconvex lens, and a negative meniscus lens having an aspheric surface on the object side and a concave surface facing the object side. Become.
図３１は、本発明の実施例７の結像光学系の広角端で無限遠合焦時のレンズ構成図である。物体側より順に負パワーの第１レンズ群Ｇ１、正パワーの単レンズからなる第２レンズ群Ｇ２、正パワーの第３レンズ群Ｇ３、正パワーの第４レンズ群Ｇ４、負パワーの第５レンズ群Ｇ５で構成され、変倍時に第１レンズ群は像面に対し固定である。 FIG. 31 is a lens configuration diagram when focusing on infinity at the wide angle end of the imaging optical system according to Example 7 of the present invention. In order from the object side, the first lens group G1 with negative power, the second lens group G2 composed of a single lens with positive power, the third lens group G3 with positive power, the fourth lens group G4 with positive power, and the fifth lens with negative power. Consists of a group G5, and the first lens group is fixed with respect to the image plane during zooming.
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、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で物体側に凸面を向けた負メニスカスレンズ、物体側の面は非球面形状で両凹の負レンズ、両凸レンズから成る。 The first lens group G1 includes a negative meniscus lens having a convex surface facing the object side, an object-side surface having an aspheric shape and a negative meniscus lens having a convex surface facing the object side, and the object-side surface having an aspheric shape facing the object side A negative meniscus lens having a convex surface and an object-side surface having an aspherical shape, a biconcave negative lens, and a biconvex lens.
また、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で構成される。 The second lens group G2 includes a positive meniscus lens having a convex surface directed toward the object side.
また、第３レンズ群Ｇ３は、物体側に凸面を向けた正メニスカスレンズ、開口絞り、両凸レンズと両凹レンズとから成る接合の負レンズ、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズから成る。 The third lens group G3 includes a positive meniscus lens having a convex surface facing the object side, an aperture stop, a cemented negative lens composed of a biconvex lens and a biconcave lens, a negative meniscus lens having a concave surface facing the object side and the biconvex lens, It consists of a cemented positive lens.
また、第４レンズ群Ｇ４は、両凸レンズと物体側に凹面を向けた負メニスカスレンズとから成る接合の正レンズ、両凸レンズから成る。 The fourth lens group G4 is composed of a cemented positive lens and a biconvex lens each composed of a biconvex lens and a negative meniscus lens having a concave surface directed toward the object side.
また、第５レンズ群Ｇ５は、物体側に凸面を向けた負メニスカスレンズと物体側に凸面を向けた正メニスカスレンズとから成る接合の負レンズ、物体側に凹面を向けた正メニスカスレンズ、物体側の面は非球面形状で物体側に凹面を向けた負メニスカスレンズから成る。 The fifth lens group G5 includes a cemented negative lens including a negative meniscus lens having a convex surface directed toward the object side and a positive meniscus lens having a convex surface directed toward the object side, a positive meniscus lens having a concave surface directed toward the object side, and an object The side surface is composed of a negative meniscus lens having an aspherical shape and a concave surface facing the object side.
なお、本発明ではフォーカスレンズ群を正の屈折力を持つ単レンズで構成しているが、そのレンズの片面あるいは両面を非球面化し球面収差、非点収差等の補正能力を上げる、あるいは回折光学素子を付加し色収差補正能力を上げることも可能である。また、フォーカスレンズ群の重量増にはなるが、フォーカス時の色収差変動の抑制を重要視する場合は、フォーカスレンズ群に負レンズを接合し色収差能力を向上させることも可能である。 In the present invention, the focus lens group is composed of a single lens having a positive refractive power. However, one or both surfaces of the lens are made aspherical to improve the correction capability for spherical aberration, astigmatism, etc., or diffractive optics. It is also possible to increase the chromatic aberration correction capability by adding an element. In addition, although the weight of the focus lens group is increased, when importance is placed on the suppression of chromatic aberration fluctuations during focusing, a negative lens can be joined to the focus lens group to improve the chromatic aberration ability.
また、フォーカスレンズを変倍時に光軸方向に移動させ、収差補正に自由度を与え、より高性能化、コンパクト化を行うことも可能である。 It is also possible to move the focus lens in the optical axis direction at the time of zooming to give a degree of freedom for aberration correction, and to achieve higher performance and compactness.
以下に、前述した本発明の結像光学系の各実施例の具体的な数値データを示す。 Specific numerical data of each embodiment of the imaging optical system of the present invention described above will be shown below.
［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５８７．５６ｎｍ）に対する屈折率、ｖｄはｄ線に対するアッベ数を示している。 In [Surface data], the surface number is the number of the lens surface or aperture stop counted from the object side, r is the radius of curvature of each surface, d is the distance between the surfaces, nd is the refractive index with respect to the d-line (wavelength 587.56 nm). , Vd indicate Abbe numbers for the d line.
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を表している。 The * (asterisk) attached to the surface number indicates that the lens surface shape is an aspherical surface. BF represents back focus.
面番号に付した（絞り）は、その位置に開口絞りが位置していることを示している。平面又は開口絞りに対する曲率半径には∞（無限大）を記入している。 The (diaphragm) attached to the surface number indicates that the aperture stop is located at that position. ∞ (infinity) is entered in the radius of curvature for a plane or aperture stop.
［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値を示している。非球面の形状は、非球面の形状は、光軸に直行する方向への光軸からの変位をｙ、非球面と光軸の交点から光軸方向への変位（サグ量）をｚ、基準球面の曲率半径をｒ、コーニック係数をＫ、４、６、８、１０、１２次の非球面係数をそれぞれＡ４、Ａ６、Ａ８、Ａ１０、Ａ１２と置くとき、非球面の座標が以下の式で表されるものとする。 In [Aspherical data], each coefficient value giving the aspherical shape of the lens surface marked with * in [Surface data] is shown. As for the aspherical shape, the aspherical shape is y for the displacement from the optical axis in the direction perpendicular to the optical axis, z for the displacement (sag amount) in the optical axis direction from the intersection of the aspherical surface and the optical axis, and the reference When the radius of curvature of the spherical surface is r, the conic coefficient is K, 4, 6, 8, 10, and 12th order aspherical coefficients are A4, A6, A8, A10, and A12, respectively, the coordinates of the aspherical surface are given by the following equations. Shall be represented.
［各種データ］には、ズーム比及び各焦点距離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 the zoom ratio and the focal length in each focal length state.
［可変間隔データ］には、各焦点距離状態における、無限遠及び物体距離４００ｍｍでの可変間隔及びＢＦの値を示している。 [Variable interval data] shows the variable interval and BF values at infinity and an object distance of 400 mm in each focal length state.
［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及び群全体の合成焦点距離を示している。 [Lens Group Data] indicates the surface number of the most object side constituting each lens group and the combined focal length of the entire group.
なお、以下の全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とにおいても同等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 all the values of the following specifications, the focal length f, the radius of curvature r, the lens surface interval d, and other length units described are in millimeters (mm) unless otherwise specified. In the system, the same optical performance can be obtained in proportional expansion and proportional reduction.
また、これらの各実施例における条件式の対応値の一覧を示す。 In addition, a list of corresponding values of the conditional expressions in each of these examples is shown.
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、△Ｓ、△Ｍ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。 In the aberration diagrams corresponding to each example, d, g, and C represent d-line, g-line, and C-line, respectively, and ΔS and ΔM represent sagittal image plane and meridional image plane, respectively. .
数値実施例1
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 37.9146 1.6443 2.00060 25.46
2 23.8702 10.6674
3* 79.4384 2.5692 1.77250 49.62
4* 20.4726 10.4375
5* 1027.6919 1.3360 1.69350 53.20
6* 41.8220 7.4758
7* -109.9763 1.1305 1.77250 49.62
8* 22.9400 0.5138
9 27.1604 4.3471 2.00099 29.14
10 153.0204 (d10)
11 98.7716 2.8685 1.51679 64.20
12 -145.1279 (d12)
13 21.3749 1.7676 1.60342 38.00
14 113.9282 8.4374
15(絞り) ∞ 1.9423
16 47.7651 2.6206 1.48749 70.44
17 -21.0789 0.8222 2.00099 29.14
18 -431.7073 0.8119
19 262.6260 7.5007 1.84666 23.78
20 -11.7078 0.8222 1.91082 35.25
21 -129.1242 (d21)
22 81.6013 4.5747 1.43700 95.10
23 -15.5458 0.8735 1.91082 35.25
24 -25.9527 0.1542
25 50.6580 2.8852 1.43700 95.10
26 -59.7294 (d26)
27 137.1271 0.9249 2.00099 29.14
28 21.1537 4.7068 1.43700 95.10
29 479.1896 2.0246
30 -42.8827 2.7953 1.43700 95.10
31 -25.3436 0.8222
32* -32.4792 0.1028 1.51840 52.09
33 -28.8124 2.5487 1.48749 70.44
34 -22.5260 (BF)
像面 ∞
[非球面データ]
3面 4面 5面 6面
K 0.0000 0.0000 0.0000 0.0000
A4 3.32416E-05 -1.53740E-05 7.02464E-05 1.23173E-04
A6 -1.29912E-07 5.41831E-08 -3.54071E-07 -8.18080E-07
A8 2.14378E-10 -7.13674E-10 1.13096E-09 2.55874E-09
A10 -1.32527E-13 1.55164E-12 -3.05301E-13 -2.02290E-12
A12 2.37145E-17 0.00000E+00 0.00000E+00 0.00000E+00
7面 8面 32面
K 0.0000 0.0000 3.0593
A4 -9.04047E-06 -2.74464E-05 -6.41829E-06
A6 -2.62714E-07 -7.74027E-08 3.62326E-08
A8 1.36796E-09 1.10877E-09 -1.04707E-10
A10 -1.67460E-12 -2.08849E-12 1.12764E-12
A12 0.00000E+00 0.00000E+00 0.00000E+00
[各種データ]
ズーム比 1.88
広角 中間 望遠
焦点距離 11.33 15.33 21.30
Fナンバー 4.50 5.00 5.86
全画角2ω 126.85 108.80 87.93
像高Y 21.63 21.63 21.63
レンズ全長 163.42 156.24 156.59
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d10 2.3258 2.3258 2.3258
d12 26.7714 12.3866 2.0509
d21 5.8476 3.6767 0.7194
d26 0.9249 4.7945 8.6840
BF 37.4199 42.9280 52.6794
広角 中間 望遠
d0 236.5825 243.7604 243.4126
d10 3.2636 3.2386 3.2398
d12 25.8336 11.4738 1.1369
d21 5.8476 3.6767 0.7194
d26 0.9249 4.7945 8.6840
BF 37.4199 42.9282 52.6795
[レンズ群データ]
群 始面 焦点距離
G1 1 -10.56
G2 11 114.18
G3 13 53.66
G4 22 38.71
G5 27 -417.67
Numerical example 1
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 37.9146 1.6443 2.00060 25.46
2 23.8702 10.6674
3 * 79.4384 2.5692 1.77250 49.62
4 * 20.4726 10.4375
5 * 1027.6919 1.3360 1.69350 53.20
6 * 41.8220 7.4758
7 * -109.9763 1.1305 1.77250 49.62
8 * 22.9400 0.5138
9 27.1604 4.3471 2.00099 29.14
10 153.0204 (d10)
11 98.7716 2.8685 1.51679 64.20
12 -145.1279 (d12)
13 21.3749 1.7676 1.60342 38.00
14 113.9282 8.4374
15 (Aperture) ∞ 1.9423
16 47.7651 2.6206 1.48749 70.44
17 -21.0789 0.8222 2.00099 29.14
18 -431.7073 0.8119
19 262.6260 7.5007 1.84666 23.78
20 -11.7078 0.8222 1.91082 35.25
21 -129.1242 (d21)
22 81.6013 4.5747 1.43700 95.10
23 -15.5458 0.8735 1.91082 35.25
24 -25.9527 0.1542
25 50.6580 2.8852 1.43700 95.10
26 -59.7294 (d26)
27 137.1271 0.9249 2.00099 29.14
28 21.1537 4.7068 1.43700 95.10
29 479.1896 2.0246
30 -42.8827 2.7953 1.43700 95.10
31 -25.3436 0.8222
32 * -32.4792 0.1028 1.51840 52.09
33 -28.8124 2.5487 1.48749 70.44
34 -22.5260 (BF)
Image plane ∞
[Aspherical data]
3
K 0.0000 0.0000 0.0000 0.0000
A4 3.32416E-05 -1.53740E-05 7.02464E-05 1.23173E-04
A6 -1.29912E-07 5.41831E-08 -3.54071E-07 -8.18080E-07
A8 2.14378E-10 -7.13674E-10 1.13096E-09 2.55874E-09
A10 -1.32527E-13 1.55164E-12 -3.05301E-13 -2.02290E-12
A12 2.37145E-17 0.00000E + 00 0.00000E + 00 0.00000E + 00
7 faces 8 faces 32 faces
K 0.0000 0.0000 3.0593
A4 -9.04047E-06 -2.74464E-05 -6.41829E-06
A6 -2.62714E-07 -7.74027E-08 3.62326E-08
A8 1.36796E-09 1.10877E-09 -1.04707E-10
A10 -1.67460E-12 -2.08849E-12 1.12764E-12
A12 0.00000E + 00 0.00000E + 00 0.00000E + 00
[Various data]
Zoom ratio 1.88
Wide angle Medium telephoto Focal length 11.33 15.33 21.30
F number 4.50 5.00 5.86
Full angle of view 2ω 126.85 108.80 87.93
Image height Y 21.63 21.63 21.63
Total lens length 163.42 156.24 156.59
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d10 2.3258 2.3258 2.3258
d12 26.7714 12.3866 2.0509
d21 5.8476 3.6767 0.7194
d26 0.9249 4.7945 8.6840
BF 37.4199 42.9280 52.6794
Wide angle Medium telephoto
d0 236.5825 243.7604 243.4126
d10 3.2636 3.2386 3.2398
d12 25.8336 11.4738 1.1369
d21 5.8476 3.6767 0.7194
d26 0.9249 4.7945 8.6840
BF 37.4199 42.9282 52.6795
[Lens group data]
Group Start surface Focal length
G1 1 -10.56
G2 11 114.18
G4 22 38.71
G5 27 -417.67
数値実施例2
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 41.1370 1.9000 1.91082 35.25
2 23.3920 10.1828
3* 52.8334 2.5000 1.69350 53.20
4 17.9014 8.6152
5* 46.1947 1.5000 1.69350 53.20
6 25.5645 6.5491
7* -48.8524 1.4000 1.69350 53.20
8 40.0639 0.3554
9 46.9526 4.7180 2.00099 29.14
10 -558.0938 (d10)
11 59.4249 2.3123 1.43700 95.10
12 183.4579 (d12)
13 34.3243 1.6990 1.58144 40.89
14 -53.6325 7.7774
15(絞り) ∞ 1.7580
16 44.2024 2.8194 1.43700 95.10
17 -19.7225 0.8000 2.00099 29.14
18 270.1768 1.7460
19 -185.7708 3.3472 1.84666 23.78
20 -12.2644 0.8000 1.91082 35.25
21 -52.7456 (d21)
22 113.6857 5.0981 1.43700 95.10
23 -14.4916 0.8500 1.91082 35.25
24 -19.6223 0.1500
25 136.1141 3.1200 1.43700 95.10
26 -48.2914 (d26)
27 -1237.7996 0.9000 1.88300 40.80
28 19.4933 5.1937 1.43700 95.10
29 301.3134 0.8600
30 439.9248 3.6990 1.43700 95.10
31 -37.2844 0.6930
32* -49.0700 0.1000 1.51840 52.09
33 -46.2470 2.5540 1.48749 70.44
34 -31.9010 (BF)
像面 ∞
[非球面データ]
3面 5面 7面 32面
K 0.0000 6.6376 0.0000 0.0000
A4 3.62001E-05 -3.12602E-05 8.70575E-06 -7.91190E-06
A6 -1.21704E-07 3.37975E-07 -1.85017E-07 1.86390E-09
A8 2.83170E-10 -1.31283E-09 1.19319E-09 9.18860E-11
A10 -3.59810E-13 2.09841E-12 -2.51596E-12 5.47840E-15
A12 1.93810E-16 -1.53790E-15 0.00000E+00 0.00000E+00
[各種データ]
ズーム比 1.73
広角 中間 望遠
焦点距離 12.31 16.44 21.34
Fナンバー 4.76 5.20 5.88
全画角2ω 122.89 103.73 87.64
像高Y 21.63 21.63 21.63
レンズ全長 156.79 149.76 147.67
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d10 1.0000 1.0000 1.0000
d12 25.0270 11.5680 3.8467
d21 7.9930 6.7010 3.3120
d26 0.9000 6.6000 11.1500
BF 37.8756 39.8967 44.3602
広角 中間 望遠
d0 243.2069 250.2368 252.3336
d10 3.1533 3.0995 3.0840
d12 22.8737 9.4685 1.7627
d21 7.9930 6.7010 3.3120
d26 0.9000 6.6000 11.1500
BF 37.8756 39.8967 44.3602
[レンズ群データ]
群 始面 焦点距離
G1 1 -12.66
G2 11 200.00
G3 13 55.43
G4 22 33.60
G5 27 -291.22
Numerical example 2
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 41.1370 1.9000 1.91082 35.25
2 23.3920 10.1828
3 * 52.8334 2.5000 1.69350 53.20
4 17.9014 8.6152
5 * 46.1947 1.5000 1.69350 53.20
6 25.5645 6.5491
7 * -48.8524 1.4000 1.69350 53.20
8 40.0639 0.3554
9 46.9526 4.7180 2.00099 29.14
10 -558.0938 (d10)
11 59.4249 2.3123 1.43700 95.10
12 183.4579 (d12)
13 34.3243 1.6990 1.58144 40.89
14 -53.6325 7.7774
15 (Aperture) ∞ 1.7580
16 44.2024 2.8194 1.43700 95.10
17 -19.7225 0.8000 2.00099 29.14
18 270.1768 1.7460
19 -185.7708 3.3472 1.84666 23.78
20 -12.2644 0.8000 1.91082 35.25
21 -52.7456 (d21)
22 113.6857 5.0981 1.43700 95.10
23 -14.4916 0.8500 1.91082 35.25
24 -19.6223 0.1500
25 136.1141 3.1200 1.43700 95.10
26 -48.2914 (d26)
27 -1237.7996 0.9000 1.88300 40.80
28 19.4933 5.1937 1.43700 95.10
29 301.3134 0.8600
30 439.9248 3.6990 1.43700 95.10
31 -37.2844 0.6930
32 * -49.0700 0.1000 1.51840 52.09
33 -46.2470 2.5540 1.48749 70.44
34 -31.9010 (BF)
Image plane ∞
[Aspherical data]
3
K 0.0000 6.6376 0.0000 0.0000
A4 3.62001E-05 -3.12602E-05 8.70575E-06 -7.91190E-06
A6 -1.21704E-07 3.37975E-07 -1.85017E-07 1.86390E-09
A8 2.83170E-10 -1.31283E-09 1.19319E-09 9.18860E-11
A10 -3.59810E-13 2.09841E-12 -2.51596E-12 5.47840E-15
A12 1.93810E-16 -1.53790E-15 0.00000E + 00 0.00000E + 00
[Various data]
Zoom ratio 1.73
Wide angle Medium telephoto Focal length 12.31 16.44 21.34
F number 4.76 5.20 5.88
Full angle of view 2ω 122.89 103.73 87.64
Image height Y 21.63 21.63 21.63
Total lens length 156.79 149.76 147.67
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d10 1.0000 1.0000 1.0000
d12 25.0270 11.5680 3.8467
d21 7.9930 6.7010 3.3120
d26 0.9000 6.6000 11.1500
BF 37.8756 39.8967 44.3602
Wide angle Medium telephoto
d0 243.2069 250.2368 252.3336
d10 3.1533 3.0995 3.0840
d12 22.8737 9.4685 1.7627
d21 7.9930 6.7010 3.3120
d26 0.9000 6.6000 11.1500
BF 37.8756 39.8967 44.3602
[Lens group data]
Group Start surface Focal length
G1 1 -12.66
G2 11 200.00
G4 22 33.60
G5 27 -291.22
数値実施例3
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 41.7797 1.9297 1.91082 35.25
2 23.7575 9.0005
3* 68.7345 2.5391 1.69350 53.20
4 20.6740 9.0143
5* 50.0068 1.5234 1.69350 53.20
6 26.6815 8.4801
7* -34.3523 1.4219 1.69350 53.20
8 64.0168 0.1523
9 64.8176 4.7917 2.00099 29.14
10 -181.2505 (d10)
11 105.7189 2.4526 1.43700 95.10
12 -500.8332 (d12)
13 25.7613 1.7255 1.58144 40.89
14 -86.7238 9.1982
15(絞り) ∞ 1.7855
16 46.0232 3.0791 1.43700 95.10
17 -17.1848 0.8125 2.00099 29.14
18 53.7618 1.7733
19 88.3991 3.6478 1.84666 23.78
20 -13.5155 0.8125 1.91082 35.25
21 -64.1766 (d21)
22 80.0099 5.2464 1.43700 95.10
23 -15.2144 0.8633 1.91082 35.25
24 -20.5063 0.1523
25 84.2189 3.1687 1.43700 95.10
26 -59.6213 (d26)
27 151.0773 0.9141 1.88300 40.80
28 18.8489 6.1816 1.43700 95.10
29 -123.3420 0.8734
30 -53.7423 3.7568 1.43700 95.10
31 -38.2661 0.7038
32* -49.8367 0.1016 1.51840 52.09
33 -46.9696 2.5939 1.48749 70.44
34 -32.3994 (BF)
像面 ∞
[非球面データ]
3面 5面 7面 32面
K 0.0000 8.3451 0.0000 0.0000
A4 3.26669E-05 -2.94440E-05 5.35140E-06 -7.55234E-06
A6 -1.09896E-07 3.04500E-07 -1.91484E-07 1.72487E-09
A8 2.54048E-10 -1.26367E-09 1.30155E-09 8.24363E-11
A10 -3.12951E-13 2.20833E-12 -3.65752E-12 4.76493E-15
A12 1.63423E-16 -1.27434E-15 0.00000E+00 0.00000E+00
[各種データ]
ズーム比 1.73
広角 中間 望遠
焦点距離 12.40 16.41 21.43
Fナンバー 4.69 5.13 5.90
全画角2ω 122.60 104.98 88.33
像高Y 21.63 21.63 21.63
レンズ全長 162.00 155.35 154.12
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d10 1.0156 1.0156 1.0156
d12 25.4180 11.7487 3.9838
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8383 40.3837 45.7326
広角 中間 望遠
d0 238.0000 244.6470 245.8839
d10 3.0863 3.0362 3.0272
d12 23.3474 9.7281 1.9722
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8383 40.3838 45.7327
[レンズ群データ]
群 始面 焦点距離
G1 1 -12.66
G2 11 200.00
G3 13 62.16
G4 22 32.30
G5 27 -331.59
Numerical example 3
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 41.7797 1.9297 1.91082 35.25
2 23.7575 9.0005
3 * 68.7345 2.5391 1.69350 53.20
4 20.6740 9.0143
5 * 50.0068 1.5234 1.69350 53.20
6 26.6815 8.4801
7 * -34.3523 1.4219 1.69350 53.20
8 64.0168 0.1523
9 64.8176 4.7917 2.00099 29.14
10 -181.2505 (d10)
11 105.7189 2.4526 1.43700 95.10
12 -500.8332 (d12)
13 25.7613 1.7255 1.58144 40.89
14 -86.7238 9.1982
15 (Aperture) ∞ 1.7855
16 46.0232 3.0791 1.43700 95.10
17 -17.1848 0.8125 2.00099 29.14
18 53.7618 1.7733
19 88.3991 3.6478 1.84666 23.78
20 -13.5155 0.8125 1.91082 35.25
21 -64.1766 (d21)
22 80.0099 5.2464 1.43700 95.10
23 -15.2144 0.8633 1.91082 35.25
24 -20.5063 0.1523
25 84.2189 3.1687 1.43700 95.10
26 -59.6213 (d26)
27 151.0773 0.9141 1.88300 40.80
28 18.8489 6.1816 1.43700 95.10
29 -123.3420 0.8734
30 -53.7423 3.7568 1.43700 95.10
31 -38.2661 0.7038
32 * -49.8367 0.1016 1.51840 52.09
33 -46.9696 2.5939 1.48749 70.44
34 -32.3994 (BF)
Image plane ∞
[Aspherical data]
3
K 0.0000 8.3451 0.0000 0.0000
A4 3.26669E-05 -2.94440E-05 5.35140E-06 -7.55234E-06
A6 -1.09896E-07 3.04500E-07 -1.91484E-07 1.72487E-09
A8 2.54048E-10 -1.26367E-09 1.30155E-09 8.24363E-11
A10 -3.12951E-13 2.20833E-12 -3.65752E-12 4.76493E-15
A12 1.63423E-16 -1.27434E-15 0.00000E + 00 0.00000E + 00
[Various data]
Zoom ratio 1.73
Wide angle Medium telephoto Focal length 12.40 16.41 21.43
F number 4.69 5.13 5.90
Full angle of view 2ω 122.60 104.98 88.33
Image height Y 21.63 21.63 21.63
Total lens length 162.00 155.35 154.12
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d10 1.0156 1.0156 1.0156
d12 25.4180 11.7487 3.9838
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8383 40.3837 45.7326
Wide angle Medium telephoto
d0 238.0000 244.6470 245.8839
d10 3.0863 3.0362 3.0272
d12 23.3474 9.7281 1.9722
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8383 40.3838 45.7327
[Lens group data]
Group Start surface Focal length
G1 1 -12.66
G2 11 200.00
G4 22 32.30
G5 27 -331.59
数値実施例4
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 41.7797 1.9297 1.91082 35.25
2 23.7575 6.6070
3* 56.4319 2.5391 1.69350 53.20
4 19.5713 9.6213
5* 52.2211 1.5234 1.69350 53.20
6 26.2619 8.7254
7* -31.2558 1.4219 1.69350 53.20
8 134.8072 0.1523
9 109.0848 4.7917 2.00099 29.14
10 -96.2690 (d10)
11 351.0034 2.5230 1.43700 95.10
12 -115.8691 (d12)
13 20.9480 1.7255 1.58144 40.89
14 -143.8500 7.6783
15(絞り) ∞ 1.7855
16 40.0194 2.9668 1.43700 95.10
17 -17.3364 0.8125 2.00099 29.14
18 41.8470 1.7733
19 85.7306 6.1264 1.84666 23.78
20 -11.7627 0.8125 1.91082 35.25
21 -158.8753 (d21)
22 110.2854 7.1766 1.43700 95.10
23 -15.1717 0.8633 1.91082 35.25
24 -21.2976 0.1523
25 65.4465 5.4010 1.43700 95.10
26 -43.1436 (d26)
27 75.1099 0.9141 1.88300 40.80
28 22.0123 9.1844 1.43700 95.10
29 -50.8365 0.7038
30* -218.2571 0.8000 1.48749 70.44
31 -505.5932 (BF)
像面 ∞
[非球面データ]
3面 5面 7面 30面
K 0.0000 8.1043 0.0000 0.0000
A4 3.54676E-05 -3.18134E-05 7.29065E-06 -7.50049E-06
A6 -1.09853E-07 2.88284E-07 -1.33209E-07 1.76083E-08
A8 2.54048E-10 -1.12191E-09 1.03660E-09 -1.08560E-10
A10 -3.12951E-13 1.45999E-12 -2.68566E-12 5.70533E-13
A12 1.63423E-16 -7.13352E-17 0.00000E+00 -1.05456E-15
[各種データ]
ズーム比 1.74
広角 中間 望遠
焦点距離 12.24 16.05 21.31
Fナンバー 4.53 4.93 5.80
全画角2ω 123.39 107.15 89.26
像高Y 21.63 21.63 21.63
レンズ全長 162.00 156.14 156.51
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d10 1.0156 1.0156 1.0156
d12 25.418 11.7487 4.1308
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8228 41.1567 47.9669
広角 中間 望遠
d0 238.0004 243.8589 243.4875
d10 3.2423 3.1946 3.1975
d12 23.1913 9.5698 1.9489
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8228 41.1566 47.9670
[レンズ群データ]
群 始面 焦点距離
G1 1 -13.80
G2 11 199.67
G3 13 85.66
G4 22 31.68
G5 27 -1407.84
Numerical example 4
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 41.7797 1.9297 1.91082 35.25
2 23.7575 6.6070
3 * 56.4319 2.5391 1.69350 53.20
4 19.5713 9.6213
5 * 52.2211 1.5234 1.69350 53.20
6 26.2619 8.7254
7 * -31.2558 1.4219 1.69350 53.20
8 134.8072 0.1523
9 109.0848 4.7917 2.00099 29.14
10 -96.2690 (d10)
11 351.0034 2.5230 1.43700 95.10
12 -115.8691 (d12)
13 20.9480 1.7255 1.58144 40.89
14 -143.8500 7.6783
15 (Aperture) ∞ 1.7855
16 40.0194 2.9668 1.43700 95.10
17 -17.3364 0.8125 2.00099 29.14
18 41.8470 1.7733
19 85.7306 6.1264 1.84666 23.78
20 -11.7627 0.8125 1.91082 35.25
21 -158.8753 (d21)
22 110.2854 7.1766 1.43700 95.10
23 -15.1717 0.8633 1.91082 35.25
24 -21.2976 0.1523
25 65.4465 5.4010 1.43700 95.10
26 -43.1436 (d26)
27 75.1099 0.9141 1.88300 40.80
28 22.0123 9.1844 1.43700 95.10
29 -50.8365 0.7038
30 * -218.2571 0.8000 1.48749 70.44
31 -505.5932 (BF)
Image plane ∞
[Aspherical data]
3
K 0.0000 8.1043 0.0000 0.0000
A4 3.54676E-05 -3.18134E-05 7.29065E-06 -7.50049E-06
A6 -1.09853E-07 2.88284E-07 -1.33209E-07 1.76083E-08
A8 2.54048E-10 -1.12191E-09 1.03660E-09 -1.08560E-10
A10 -3.12951E-13 1.45999E-12 -2.68566E-12 5.70533E-13
A12 1.63423E-16 -7.13352E-17 0.00000E + 00 -1.05456E-15
[Various data]
Zoom ratio 1.74
Wide angle Medium telephoto Focal length 12.24 16.05 21.31
F number 4.53 4.93 5.80
Full angle of view 2ω 123.39 107.15 89.26
Image height Y 21.63 21.63 21.63
Total lens length 162.00 156.14 156.51
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d10 1.0156 1.0156 1.0156
d12 25.418 11.7487 4.1308
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8228 41.1567 47.9669
Wide angle Medium telephoto
d0 238.0004 243.8589 243.4875
d10 3.2423 3.1946 3.1975
d12 23.1913 9.5698 1.9489
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8228 41.1566 47.9670
[Lens group data]
Group Start surface Focal length
G1 1 -13.80
G2 11 199.67
G4 22 31.68
G5 27 -1407.84
数値実施例5
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 41.7797 1.9297 1.91082 35.25
2 23.7575 5.5726
3* 47.0366 2.5391 1.69350 53.20
4 18.4242 10.2092
5* 49.5526 1.5234 1.69350 53.20
6 23.7339 8.1722
7* -44.6733 1.4219 1.69350 53.20
8 83.0133 0.1523
9 57.1722 4.7917 2.00099 29.14
10 -590.2218 (d10)
11 77.1853 2.5539 1.43700 95.10
12 1134.3138 (d12)
13 25.6263 1.7255 1.58144 40.89
14 -81.7691 6.6108
15(絞り) ∞ 1.7855
16 49.3339 5.9319 1.43700 95.10
17 -17.0608 0.8125 2.00099 29.14
18 52.2682 1.7733
19 94.7589 4.5345 1.84666 23.78
20 -12.3220 0.8125 1.91082 35.25
21 -129.8740 (d21)
22 -329.3381 7.8025 1.43700 95.10
23 -13.7994 0.8633 1.91082 35.25
24 -18.0884 0.1523
25 46.2226 6.0707 1.43700 95.10
26 -61.2707 (d26)
27 66.1717 0.9141 1.88300 40.80
28 21.0867 9.9791 1.43700 95.10
29* -66.9178 (BF)
像面 ∞
[非球面データ]
3面 5面 7面 29面
K 0.0000 6.9779 0.0000 0.0000
A4 3.70925E-05 -3.80677E-05 7.91575E-06 5.22920E-06
A6 -1.14301E-07 3.73491E-07 -1.63857E-07 3.01560E-09
A8 2.54048E-10 -1.51369E-09 1.10395E-09 -1.41555E-10
A10 -3.12951E-13 2.59192E-12 -2.45287E-12 5.89155E-13
A12 1.63423E-16 -1.48081E-15 0.00000E+00 -1.04444E-15
[各種データ]
ズーム比 1.71
広角 中間 望遠
焦点距離 12.36 16.12 21.19
Fナンバー 4.61 4.96 5.76
全画角2ω 123.06 106.18 89.13
像高Y 21.63 21.63 21.63
レンズ全長 162.00 155.83 155.57
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d10 1.0156 1.0156 1.0156
d12 25.4180 11.7487 4.2355
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8998 40.9176 46.9968
広角 中間 望遠
d0 238.0002 244.1748 244.4298
d10 3.3431 3.2906 3.2885
d12 23.0906 9.4738 1.9626
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8998 40.9176 46.9968
[レンズ群データ]
群 始面 焦点距離
G1 1 -14.10
G2 11 189.38
G3 13 83.51
G4 22 31.45
G5 27 -1199.40
Numerical example 5
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 41.7797 1.9297 1.91082 35.25
2 23.7575 5.5726
3 * 47.0366 2.5391 1.69350 53.20
4 18.4242 10.2092
5 * 49.5526 1.5234 1.69350 53.20
6 23.7339 8.1722
7 * -44.6733 1.4219 1.69350 53.20
8 83.0133 0.1523
9 57.1722 4.7917 2.00099 29.14
10 -590.2218 (d10)
11 77.1853 2.5539 1.43700 95.10
12 1134.3138 (d12)
13 25.6263 1.7255 1.58144 40.89
14 -81.7691 6.6108
15 (Aperture) ∞ 1.7855
16 49.3339 5.9319 1.43700 95.10
17 -17.0608 0.8125 2.00099 29.14
18 52.2682 1.7733
19 94.7589 4.5345 1.84666 23.78
20 -12.3220 0.8125 1.91082 35.25
21 -129.8740 (d21)
22 -329.3381 7.8025 1.43700 95.10
23 -13.7994 0.8633 1.91082 35.25
24 -18.0884 0.1523
25 46.2226 6.0707 1.43700 95.10
26 -61.2707 (d26)
27 66.1717 0.9141 1.88300 40.80
28 21.0867 9.9791 1.43700 95.10
29 * -66.9178 (BF)
Image plane ∞
[Aspherical data]
3
K 0.0000 6.9779 0.0000 0.0000
A4 3.70925E-05 -3.80677E-05 7.91575E-06 5.22920E-06
A6 -1.14301E-07 3.73491E-07 -1.63857E-07 3.01560E-09
A8 2.54048E-10 -1.51369E-09 1.10395E-09 -1.41555E-10
A10 -3.12951E-13 2.59192E-12 -2.45287E-12 5.89155E-13
A12 1.63423E-16 -1.48081E-15 0.00000E + 00 -1.04444E-15
[Various data]
Zoom ratio 1.71
Wide angle Medium telephoto Focal length 12.36 16.12 21.19
F number 4.61 4.96 5.76
Full angle of view 2ω 123.06 106.18 89.13
Image height Y 21.63 21.63 21.63
Total lens length 162.00 155.83 155.57
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d10 1.0156 1.0156 1.0156
d12 25.4180 11.7487 4.2355
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8998 40.9176 46.9968
Wide angle Medium telephoto
d0 238.0002 244.1748 244.4298
d10 3.3431 3.2906 3.2885
d12 23.0906 9.4738 1.9626
d21 8.1179 6.8057 3.3637
d26 0.9141 6.7031 11.3242
BF 37.8998 40.9176 46.9968
[Lens group data]
Group Start surface Focal length
G1 1 -14.10
G2 11 189.38
G4 22 31.45
G5 27 -1199.40
数値実施例6
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 42.6615 1.9704 1.91082 35.25
2 24.2589 7.4590
3* 68.5127 2.5926 1.69350 53.20
4 21.1235 8.4025
5* 53.1361 1.5556 1.69350 53.20
6 25.1251 9.1067
7* -49.2216 1.4519 1.69350 53.20
8 24.3952 0.5321
9 26.8772 4.8928 2.00099 29.14
10 186.9060 (d10)
11 49.2921 2.3923 1.43700 95.10
12 94.1401 (d12)
13 15.2138 2.0627 1.58144 40.89
14 66.6362 8.8601
15(絞り) ∞ 1.8232
16 20.2888 3.4522 1.43700 95.10
17 -13.0587 0.8296 2.00099 29.14
18 31.1192 1.8107
19 51.7527 9.6519 1.84666 23.78
20 -14.7218 0.8296 1.91082 35.25
21 -47.5792 (d21)
22 47.0964 5.0631 1.43700 95.10
23 -24.8236 0.8815 1.91082 35.25
24 -38.0253 0.1556
25 133.9984 3.2356 1.43700 95.10
26 -62.1807 (d26)
27 167.8456 0.9334 1.88300 40.80
28 22.2690 7.4397 1.43700 95.10
29 -34.4542 0.7187
30* -99.4614 1.6000 1.48749 70.44
31 -120.7825 (BF)
像面 ∞
[非球面データ]
3面 5面 7面 30面
K 0 8.1017 0 0
A4 4.00906E-05 -3.07259E-05 -7.27774E-06 -8.83546E-06
A6 -1.08478E-07 2.72244E-07 -7.41627E-08 3.28954E-10
A8 2.19493E-10 -9.69867E-10 5.87116E-10 9.87987E-11
A10 -2.59322E-13 1.69207E-12 -1.61270E-12 -4.78902E-13
A12 1.29878E-16 -1.05232E-15 0.00000E+00 8.44904E-16
[各種データ]
ズーム比 1.66
広角 中間 望遠
焦点距離 12.48 17.15 20.74
Fナンバー 4.71 5.28 5.86
全画角2ω 122.90 101.94 90.45
像高Y 21.63 21.63 21.63
レンズ全長 162.00 161.99 162.01
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d10 1.0371 1.0371 1.0371
d12 25.9545 11.9967 6.9120
d21 6.4716 7.3808 3.4347
d26 0.9334 7.4600 9.5153
BF 37.9000 44.4083 51.4052
広角 中間 望遠
d0 238.0000 238.0000 237.9922
d10 3.4990 3.4989 3.4991
d12 23.4925 9.5349 4.4500
d21 6.4716 7.3808 3.4347
d26 0.9334 7.4600 9.5153
BF 37.9000 44.4083 51.4051
[レンズ群データ]
群 始面 焦点距離
G1 1 -12.28
G2 11 232.99
G3 13 52.70
G4 22 42.04
G5 27 -500.00
Numerical example 6
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 42.6615 1.9704 1.91082 35.25
2 24.2589 7.4590
3 * 68.5127 2.5926 1.69350 53.20
4 21.1235 8.4025
5 * 53.1361 1.5556 1.69350 53.20
6 25.1251 9.1067
7 * -49.2216 1.4519 1.69350 53.20
8 24.3952 0.5321
9 26.8772 4.8928 2.00099 29.14
10 186.9060 (d10)
11 49.2921 2.3923 1.43700 95.10
12 94.1401 (d12)
13 15.2138 2.0627 1.58144 40.89
14 66.6362 8.8601
15 (Aperture) ∞ 1.8232
16 20.2888 3.4522 1.43700 95.10
17 -13.0587 0.8296 2.00099 29.14
18 31.1192 1.8107
19 51.7527 9.6519 1.84666 23.78
20 -14.7218 0.8296 1.91082 35.25
21 -47.5792 (d21)
22 47.0964 5.0631 1.43700 95.10
23 -24.8236 0.8815 1.91082 35.25
24 -38.0253 0.1556
25 133.9984 3.2356 1.43700 95.10
26 -62.1807 (d26)
27 167.8456 0.9334 1.88300 40.80
28 22.2690 7.4397 1.43700 95.10
29 -34.4542 0.7187
30 * -99.4614 1.6000 1.48749 70.44
31 -120.7825 (BF)
Image plane ∞
[Aspherical data]
3
A4 4.00906E-05 -3.07259E-05 -7.27774E-06 -8.83546E-06
A6 -1.08478E-07 2.72244E-07 -7.41627E-08 3.28954E-10
A8 2.19493E-10 -9.69867E-10 5.87116E-10 9.87987E-11
A10 -2.59322E-13 1.69207E-12 -1.61270E-12 -4.78902E-13
A12 1.29878E-16 -1.05232E-15 0.00000E + 00 8.44904E-16
[Various data]
Zoom ratio 1.66
Wide angle Medium telephoto Focal length 12.48 17.15 20.74
F number 4.71 5.28 5.86
Full angle of view 2ω 122.90 101.94 90.45
Image height Y 21.63 21.63 21.63
Total lens length 162.00 161.99 162.01
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d10 1.0371 1.0371 1.0371
d12 25.9545 11.9967 6.9120
d21 6.4716 7.3808 3.4347
d26 0.9334 7.4600 9.5153
BF 37.9000 44.4083 51.4052
Wide angle Medium telephoto
d0 238.0000 238.0000 237.9922
d10 3.4990 3.4989 3.4991
d12 23.4925 9.5349 4.4500
d21 6.4716 7.3808 3.4347
d26 0.9334 7.4600 9.5153
BF 37.9000 44.4083 51.4051
[Lens group data]
Group Start surface Focal length
G1 1 -12.28
G2 11 232.99
G4 22 42.04
G5 27 -500.00
数値実施例7
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ (d0)
1 42.6615 1.9704 1.91082 35.25
2 24.2589 7.6175
3* 68.7727 2.5926 1.69350 53.20
4 21.1680 8.3395
5* 53.1955 1.5556 1.69350 53.20
6 26.1036 9.2168
7* -40.1293 1.4519 1.69350 53.20
8 27.4245 0.6772
9 31.8104 4.8928 2.00099 29.14
10 -788.6319 (d10)
11 78.9259 2.1644 1.43700 95.10
12 179.1632 (d12)
13 14.5760 2.0021 1.58144 40.89
14 45.5870 9.0441
15(絞り) ∞ 1.8232
16 23.7876 3.4595 1.43700 95.10
17 -12.2968 0.8296 2.00099 29.14
18 44.3787 1.8107
19 55.0102 8.9739 1.84666 23.78
20 -14.1603 0.8296 1.91082 35.25
21 -45.6408 (d21)
22 55.3354 4.5228 1.43700 95.10
23 -22.9699 0.8815 1.91082 35.25
24 -37.2552 0.1556
25 44.7873 3.2356 1.43700 95.10
26 -169.4440 (d26)
27 163.7871 0.9334 1.88300 40.80
28 22.8228 5.0250 1.43700 95.10
29 956.6489 1.3499
30 -263.2255 3.6427 1.43700 95.10
31 -28.2616 0.7187
32* -157.0485 0.9651 1.48749 70.44
33 -877.1794 (BF)
像面 ∞
[非球面データ]
3面 5面 7面 32面
K 0.0000 8.1747 0.0000 0.0000
A4 4.04247E-05 -3.40986E-05 -1.52083E-06 -1.46722E-05
A6 -1.10311E-07 2.88987E-07 -8.50188E-08 -3.65818E-09
A8 2.19493E-10 -1.03406E-09 6.12518E-10 9.01030E-11
A10 -2.59322E-13 1.89859E-12 -1.60202E-12 -5.71891E-13
A12 1.29878E-16 -1.37022E-15 0.00000E+00 1.14095E-15
[各種データ]
ズーム比 1.69
広角 中間 望遠
焦点距離 12.51 16.86 21.19
Fナンバー 4.72 5.22 5.89
全画角2ω 122.78 102.76 89.26
像高Y 21.63 21.63 21.63
レンズ全長 162.00 161.99 162.01
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d10 1.0371 1.0371 1.0371
d12 25.9545 11.9967 5.4904
d21 5.4935 8.1137 3.4347
d26 0.9334 7.0748 7.7080
BF 37.9000 43.0819 53.6627
広角 中間 望遠
d0 238.0000 238.0142 237.9854
d10 4.4399 4.4398 4.4401
d12 22.5516 8.5940 2.0874
d21 5.4935 8.1137 3.4347
d26 0.9334 7.0748 7.7080
BF 37.9000 43.0818 53.6627
[レンズ群データ]
群 始面 焦点距離
G1 1 -13.14
G2 11 320.71
G3 13 55.85
G4 22 42.17
G5 27 -490.53
Numerical example 7
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ (d0)
1 42.6615 1.9704 1.91082 35.25
2 24.2589 7.6175
3 * 68.7727 2.5926 1.69350 53.20
4 21.1680 8.3395
5 * 53.1955 1.5556 1.69350 53.20
6 26.1036 9.2168
7 * -40.1293 1.4519 1.69350 53.20
8 27.4245 0.6772
9 31.8104 4.8928 2.00099 29.14
10 -788.6319 (d10)
11 78.9259 2.1644 1.43700 95.10
12 179.1632 (d12)
13 14.5760 2.0021 1.58144 40.89
14 45.5870 9.0441
15 (Aperture) ∞ 1.8232
16 23.7876 3.4595 1.43700 95.10
17 -12.2968 0.8296 2.00099 29.14
18 44.3787 1.8107
19 55.0102 8.9739 1.84666 23.78
20 -14.1603 0.8296 1.91082 35.25
21 -45.6408 (d21)
22 55.3354 4.5228 1.43700 95.10
23 -22.9699 0.8815 1.91082 35.25
24 -37.2552 0.1556
25 44.7873 3.2356 1.43700 95.10
26 -169.4440 (d26)
27 163.7871 0.9334 1.88300 40.80
28 22.8228 5.0250 1.43700 95.10
29 956.6489 1.3499
30 -263.2255 3.6427 1.43700 95.10
31 -28.2616 0.7187
32 * -157.0485 0.9651 1.48749 70.44
33 -877.1794 (BF)
Image plane ∞
[Aspherical data]
3
K 0.0000 8.1747 0.0000 0.0000
A4 4.04247E-05 -3.40986E-05 -1.52083E-06 -1.46722E-05
A6 -1.10311E-07 2.88987E-07 -8.50188E-08 -3.65818E-09
A8 2.19493E-10 -1.03406E-09 6.12518E-10 9.01030E-11
A10 -2.59322E-13 1.89859E-12 -1.60202E-12 -5.71891E-13
A12 1.29878E-16 -1.37022E-15 0.00000E + 00 1.14095E-15
[Various data]
Zoom ratio 1.69
Wide angle Medium telephoto Focal length 12.51 16.86 21.19
F number 4.72 5.22 5.89
Full angle of view 2ω 122.78 102.76 89.26
Image height Y 21.63 21.63 21.63
Total lens length 162.00 161.99 162.01
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d10 1.0371 1.0371 1.0371
d12 25.9545 11.9967 5.4904
d21 5.4935 8.1137 3.4347
d26 0.9334 7.0748 7.7080
BF 37.9000 43.0819 53.6627
Wide angle Medium telephoto
d0 238.0000 238.0142 237.9854
d10 4.4399 4.4398 4.4401
d12 22.5516 8.5940 2.0874
d21 5.4935 8.1137 3.4347
d26 0.9334 7.0748 7.7080
BF 37.9000 43.0818 53.6627
[Lens group data]
Group Start surface Focal length
G1 1 -13.14
G2 11 320.71
G4 22 42.17
G5 27 -490.53
[条件式対応値]
条件式／実施例 1 2 3 4 5 6 7
(1) 5.0＜f2/fw＜40.0 10.08 16.24 16.13 16.31 15.32 18.67 25.64
(2) 0.4＜1/(MRT^2×(M2T^2-1)) 0.54 1.30 1.21 1.31 1.39 1.55 2.07
(3) 0.1＜FcEntpW/f2＜0.7 0.55 0.24 0.26 0.24 0.24 0.23 0.15
(4) 2.5＜FcEntpW/fw 5.56 3.85 4.22 3.93 3.73 4.25 3.94
[Values for conditional expressions]
Conditional expression / Example 1 2 3 4 5 6 7
(1) 5.0 <f2 / fw <40.0 10.08 16.24 16.13 16.31 15.32 18.67 25.64
(2) 0.4 <1 / (MRT ^ 2 × (M2T ^ 2-1)) 0.54 1.30 1.21 1.31 1.39 1.55 2.07
(3) 0.1 <FcEntpW / f2 <0.7 0.55 0.24 0.26 0.24 0.24 0.23 0.15
(4) 2.5 <FcEntpW / fw 5.56 3.85 4.22 3.93 3.73 4.25 3.94
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
Ｓ 開口絞り
Ｉ 像面
G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group G5 Fifth lens group S Aperture stop I Image surface
Claims (3)
（１）５．０＜ｆ２／ｆｗ＜４０．０
（２）０．４＜１／（ＭＲＴ＾２×（Ｍ２Ｔ＾２−１））
ただし、
ｆｗ：ワイド端無限遠時の焦点距離
ｆ２：第２レンズ群の焦点距離
Ｍ２Ｔ：物体距離無限遠時の望遠端の第２レンズ群の倍率負担
ＭＲＴ：物体距離無限遠時の望遠端の第３レンズ群から第５レンズ群までの合成倍率負担 In order from the object side, the first lens group G1 with negative power, the second lens group G2 composed of a single lens with positive power, the third lens group G3 with positive power, the fourth lens group G4 with positive power, and the fifth lens with negative power. The super wide-angle zoom lens system comprising the group G5, wherein the second lens group G2 moves in the image plane direction when focusing from an object side infinity to a short distance object, and satisfies the following conditions.
(1) 5.0 <f2 / fw <40.0
(2) 0.4 <1 / (MRT ^ 2 × (M2T ^ 2-1))
However,
fw: focal length at the wide end infinity f2: focal length of the second lens group M2T: magnification burden of the second lens group at the telephoto end when the object distance is infinity MRT: third telephoto end at the object distance infinity Composite magnification burden from the lens group to the fifth lens group
（３）０．１＜ＦｃＥｎｔｐ／ｆ２＜０．７
（４）２．５＜ＦｃＥｎｔｐ／ｆｗ When the image position of the stop by the combining optical system of the surface from the second lens group G2 at the wide angle end to the front of the stop is FcEntp with the object side surface of the second lens group G2 as a reference, the following conditions are satisfied. The super wide-angle zoom lens according to claim 1, wherein the zoom lens is satisfied.
(3) 0.1 <FcEntp / f2 <0.7
(4) 2.5 <FcEntp / fw
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| JP2014082214A JP6199230B2 (en) | 2014-04-11 | 2014-04-11 | Super wide-angle zoom lens |
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| JP6749631B2 (en) * | 2016-07-01 | 2020-09-02 | 株式会社シグマ | Large aperture wide angle zoom lens |
| JP6699522B2 (en) * | 2016-11-29 | 2020-05-27 | コニカミノルタ株式会社 | Zoom lens, imaging optical device and digital equipment |
| WO2018139160A1 (en) * | 2017-01-25 | 2018-08-02 | ソニー株式会社 | Zoom lens and imaging device |
| JP7240631B2 (en) * | 2019-04-01 | 2023-03-16 | 株式会社ニコン | Variable magnification optical system and optical equipment |
| CN117687187A (en) * | 2019-12-10 | 2024-03-12 | 株式会社尼康 | Variable magnification optical system and optical device |
| CN114761854B (en) * | 2019-12-10 | 2024-06-28 | 株式会社尼康 | Optical system and optical apparatus |
| JP2023066202A (en) | 2021-10-28 | 2023-05-15 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
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| JP2932603B2 (en) * | 1990-05-09 | 1999-08-09 | キヤノン株式会社 | Zoom lens |
| JP2970289B2 (en) * | 1993-02-04 | 1999-11-02 | キヤノン株式会社 | Zoom lens |
| JP4519232B2 (en) * | 1999-12-28 | 2010-08-04 | 株式会社シグマ | Zoom lens |
| JP5833357B2 (en) * | 2011-07-01 | 2015-12-16 | 株式会社シグマ | Super wide-angle lens system |
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