JP5554679B2 - Telephoto zoom lens - Google Patents
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Description
本発明はスチルカメラやビデオカメラ等に好適な望遠ズームレンズに関し、特に画角が狭く、焦点距離の長い望遠レンズの光学系全長短縮及び小径化に関する。 The present invention relates to a telephoto zoom lens suitable for a still camera, a video camera, and the like, and particularly relates to shortening and reducing the overall length of an optical system of a telephoto lens having a narrow angle of view and a long focal length.
近年、一眼レフレックス方式または電子ファインダーを搭載する、レンズ交換式のデジタルカメラが普及している。これらのカメラは、ファインダー像と撮影像の視差がないため、様々な画角の交換レンズの使用に適する。 In recent years, interchangeable-lens digital cameras equipped with a single-lens reflex system or an electronic viewfinder have become widespread. These cameras are suitable for use with interchangeable lenses having various angles of view because there is no parallax between the viewfinder image and the captured image.
特に望遠レンズは、視差の影響を大きく受けるため、ファインダーと撮影レンズとの間に大きな視差のあるカメラに使用する際に問題となる。このため、望遠レンズは、一眼レフレックス方式または電子ファインダーを搭載するレンズ交換式のデジタルカメラの交換レンズとして使用することが適しており、一眼レフレックス方式または電子ファインダーを搭載する、レンズ交換式のデジタルカメラの普及に伴って、需要が拡大している。 In particular, the telephoto lens is greatly affected by parallax, and thus becomes a problem when used for a camera having a large parallax between the viewfinder and the photographing lens. For this reason, the telephoto lens is suitable for use as an interchangeable lens of a single-lens reflex system or an interchangeable lens digital camera equipped with an electronic viewfinder, and an interchangeable lens system equipped with a single-lens reflex system or electronic viewfinder. With the spread of digital cameras, demand is expanding.
一般的に望遠ズームレンズにおいては、画角を狭くすると焦点距離が長くなるため、レンズ系全体の大型化、ズーミングに伴う各レンズ群移動量の増大、フォーカスレンズ群の重量や移動量の増大およびそれに伴うオートフォーカス駆動速度の低下など、多くの問題が生じる。 In general, in a telephoto zoom lens, if the angle of view is narrowed, the focal length becomes longer.Therefore, the entire lens system is enlarged, the amount of movement of each lens unit accompanying zooming, the weight of the focus lens unit and the amount of movement are increased, and Many problems occur, such as a decrease in autofocus driving speed.
望遠ズームレンズの小型化やフォーカス駆動の高速化に関する技術は以前より数多く提案されている。 Many technologies related to downsizing of a telephoto zoom lens and high speed of focus drive have been proposed.
小型の望遠ズームレンズとしては、物体側から順に正の第１レンズ群、負の第２レンズ群、正の第３レンズ群、負の第４レンズ群を備える構成がよく知られており、例えば特許文献１や特許文献２等に記載されている。 As a small telephoto zoom lens, a configuration including a positive first lens group, a negative second lens group, a positive third lens group, and a negative fourth lens group in order from the object side is well known. It is described in Patent Document 1, Patent Document 2, and the like.
特許文献１及び特許文献２に記載された形式の望遠ズームレンズでは、広角端において、第１レンズ群と第２レンズ群が接近して、第１レンズ群と第２レンズ群の合成系の屈折力が弱い正または弱い負の屈折力となる。また、第３レンズ群と第４レンズ群とが離れることにより、第３レンズ群と第４レンズ群の間でテレフォト型のパワー配置が形成される。 In the telephoto zoom lens of the type described in Patent Document 1 and Patent Document 2, the first lens group and the second lens group approach each other at the wide-angle end, and the refraction of the combined system of the first lens group and the second lens group. The power is weak positive or weak negative refractive power. Further, when the third lens group and the fourth lens group are separated from each other, a telephoto power arrangement is formed between the third lens group and the fourth lens group.
一方、望遠端において、第１レンズ群と第２レンズ群の間隔が広がることで、第２レンズ群から第４レンズ群までのレンズ群が互いに接近し、第２レンズ群から第４レンズ群の合成系が負の屈折力となり、第１レンズ群と第２レンズ群から第４レンズ群との間でテレフォト型の屈折力配置が形成される。このような構成とすることで光学系全長を抑制しながらズーム比を確保している。 On the other hand, when the distance between the first lens group and the second lens group is widened at the telephoto end, the lens groups from the second lens group to the fourth lens group approach each other, and the second lens group to the fourth lens group The composite system has negative refractive power, and a telephoto type refractive power arrangement is formed between the first lens group and the second lens group to the fourth lens group. With such a configuration, the zoom ratio is ensured while suppressing the overall length of the optical system.
また、ズーミングの際に移動するレンズ群の数を増やすことで、より良好な収差補正を図るズームレンズの例が、例えば特許文献３等に記載されている。
An example of a zoom lens that achieves better aberration correction by increasing the number of lens groups that move during zooming is described in
従来、特許文献３に記載のレンズのように一般的には第１レンズ群を移動させることで近距離へのフォーカシングを行うことが多かった。しかし、第１レンズ群はズームレンズ系の中で最も重量が重いため、第１レンズ群を用いてフォーカシング動作を行うことは、フォーカス駆動速度が低下したり、アクチュエータの大型化により鏡筒が大型化する問題を招く。
Conventionally, in general, focusing to a short distance is often performed by moving the first lens group as in the lens described in
また、ズームレンズ内部の小さなレンズ群で近距離へのフォーカシングを行うズームレンズが提案されており、例えば特許文献４や特許文献５等に記載されている。
In addition, zoom lenses that focus on a short distance with a small lens group inside the zoom lens have been proposed, and are described in, for example, Patent Document 4 and
従来の望遠ズームレンズに対し、さらなる小型化とズーム倍率の維持を達成しようとする場合、ズームレンズ光学系全体の全長の短縮のほか、各レンズ群の移動量の削減やフォーカスレンズ群の移動量および重量の削減が必要となる。 When trying to achieve further miniaturization and maintenance of zoom magnification compared to conventional telephoto zoom lenses, in addition to shortening the overall length of the zoom lens optical system, the movement amount of each lens group and the movement amount of the focus lens group And weight reduction is required.
望遠ズームレンズにおいては、特に第１レンズ群やレンズ系後方の負の屈折力のレンズ群の移動量が大きくなりがちであり、ズームカムの傾きを大きくし、単位回転角に対するレンズ群の移動量を増やす必要がある。しかし、ズームカムの傾きを大きくするとトルクが重くなり、ズーム操作の操作感などに支障を生じる。 In a telephoto zoom lens, the amount of movement of the first lens unit and the lens unit having a negative refractive power behind the lens system tends to be large. The tilt of the zoom cam is increased, and the amount of movement of the lens unit relative to the unit rotation angle is increased. Need to increase. However, if the tilt of the zoom cam is increased, the torque becomes heavier, causing a problem in the operation feeling of the zoom operation.
ズームカムの傾きを緩和させるには、カム筒の径を大きくすることが有効であるが、カム筒の径を大きくした場合には、必然的にレンズ鏡筒全体が大きくなってしまい、望ましくない。 In order to alleviate the tilt of the zoom cam, it is effective to increase the diameter of the cam barrel. However, if the diameter of the cam barrel is increased, the entire lens barrel inevitably increases, which is not desirable.
また、望遠レンズは焦点距離が長く、撮影距離の変化に伴う像面の移動が大きいため、フォーカスレンズ群の移動量が大きくなる傾向がある。フォーカスレンズの移動量が大きい場合、フォーカスレンズ群を速く動かさなければフォーカシングに時間がかかってしまう。したがって、フォーカスレンズ群を速く動かせるパワーのあるアクチュエータを使う必要があるが、パワーがあるアクチュエータは大きく、重いため、これを搭載するとズームレンズ光学系の小型化や軽量化を阻害してしまう。フォーカスレンズ群を駆動するアクチュエータを小型化するためにはフォーカスレンズ群の移動量を抑制し、さらにその重量を軽減することが望ましい。 In addition, since the telephoto lens has a long focal length and a large movement of the image plane with a change in the photographing distance, the movement amount of the focus lens group tends to increase. If the amount of movement of the focus lens is large, focusing will take time unless the focus lens group is moved quickly. Therefore, it is necessary to use an actuator with power that can move the focus lens group quickly. However, since the actuator with power is large and heavy, if this is installed, the zoom lens optical system will be reduced in size and weight. In order to reduce the size of the actuator that drives the focus lens group, it is desirable to suppress the movement amount of the focus lens group and further reduce its weight.
さらに近年では動画の撮影への対応が求められ、オートフォーカスの駆動をより静粛に行うことが要求されており、フォーカスレンズ群の軽量化が強く求められている。 Furthermore, in recent years, it has been required to cope with shooting of moving images, and it has been required to drive the autofocus more silently, and the weight reduction of the focus lens group is strongly demanded.
上記の要求を満たしたうえで、望遠レンズにおいて問題となる軸上色収差や球面収差を良好に補正する必要がある。 It is necessary to satisfactorily correct axial chromatic aberration and spherical aberration, which are problems in telephoto lenses, after satisfying the above requirements.
特許文献１に記載の望遠ズームレンズは、望遠端における望遠比が０．６６程度と非常に小型化されているが、ズーム比が３倍程度とやや低い。また色収差および球面収差の補正が不十分であることや、ズーミングに伴う球面収差の変動が大きいなどの問題があり、性能が不十分である。 The telephoto zoom lens described in Patent Document 1 is very compact with a telephoto ratio at the telephoto end of approximately 0.66, but the zoom ratio is slightly low at approximately 3 times. Further, there are problems such as insufficient correction of chromatic aberration and spherical aberration and large fluctuation of spherical aberration due to zooming, and the performance is insufficient.
また、ズーミングに伴う第１レンズ群の移動量が、焦点距離やズーム比に比して大きく、さらに第４レンズ群の移動量も、第１レンズ群とほぼ同程度と大きい。鏡筒の小径化及び軽く滑らかなズーム操作性を確保するためには、少なくとも第１レンズ群又は第４レンズ群のうち、片方のレンズ群の移動量を削減する必要がある。 Further, the amount of movement of the first lens group accompanying zooming is larger than the focal length and zoom ratio, and the amount of movement of the fourth lens group is also almost as large as that of the first lens group. In order to ensure the small diameter of the lens barrel and light and smooth zoom operability, it is necessary to reduce the amount of movement of at least one of the first lens group and the fourth lens group.
特許文献２に記載の望遠ズームレンズは、望遠端における望遠比が０．６５を切り、非常に小型化されており、ズーム比も４倍程度を確保している。しかしながら球面収差の補正が不十分で、ズーミングによる変動も大きく、性能が不十分である。 The telephoto zoom lens described in Patent Document 2 has a telephoto ratio of less than 0.65 at the telephoto end and is extremely miniaturized, and a zoom ratio of about 4 times is ensured. However, correction of spherical aberration is insufficient, fluctuation due to zooming is large, and performance is insufficient.
さらに第１レンズ群と第４レンズ群のズーミングに伴う移動量が同程度であるため、少なくともこのうちの片方の移動量を削減することが、レンズ鏡筒の小径化及び軽く滑らかなズーム操作性を確保するために必要である。 Further, since the first lens unit and the fourth lens unit have the same amount of movement due to zooming, at least one of them can be reduced by reducing the lens barrel diameter and light and smooth zoom operation. Is necessary to ensure.
特許文献３に記載の望遠ズームレンズは、ズーミングによって移動する６つのレンズ群を設け、ズーム比を５倍程度としながら球面収差の変動を抑制しており、第１レンズ群の移動量も焦点距離やズーム比に比して少なく、後方のレンズ群の移動量も抑制されている。しかしながら、望遠端における望遠比は０．７４であって、携行性を高めるためには望遠端での望遠比０．６５程度を実現することが望ましい。
The telephoto zoom lens described in
特許文献４に記載の望遠ズームレンズは、ズーミングによって移動する７つのレンズ群を設け、ズーム比が１０倍程度でありながら、球面収差と色収差を良好に補正し、高い結像性能を得ており、第１レンズ群や後方のレンズ群の移動量も抑制されている。しかしながら、望遠端における望遠比０．７１程度であり、やはり光学系全長の短縮が不十分である。また、第７レンズ群をフォーカスレンズ群としてフォーカスレンズ群の小型化を図っているが、第７レンズ群の構成枚数が４枚と多く、高速なオートフォーカスに対応するには軽量化が不十分である。 The telephoto zoom lens described in Patent Document 4 is provided with seven lens groups that move by zooming, and while maintaining a zoom ratio of about 10 times, it corrects spherical aberration and chromatic aberration well and obtains high imaging performance. The movement amount of the first lens group and the rear lens group is also suppressed. However, the telephoto ratio at the telephoto end is about 0.71, and the overall length of the optical system is not sufficiently shortened. Although the seventh lens group is used as the focus lens group to reduce the size of the focus lens group, the number of the seventh lens group is as many as four, and the weight reduction is insufficient to support high-speed autofocus. It is.
特許文献５に記載の望遠ズームレンズは、ズーミングによって移動する５つ又は６つのレンズ群を設け、ズーミングに伴う収差変動を抑制するとともに、フォーカスレンズ群をレンズ群後方の１枚または２枚にて構成し軽量化を図っている。しかしながら、望遠端での望遠比は０．８程度で小型化が不十分である。また、ズーミングに伴う第１レンズ群、第５レンズ群や第６レンズ群の移動量が焦点距離に比して大きく、鏡筒の小径化及び軽く滑らかなズーム操作性を確保するためには好ましくない。
The telephoto zoom lens described in
本発明は、特に望遠端での対角線画角が５度以下、且つ、ズーム比が３．７５倍以上のズームレンズにおいて、高い結像性能を保持しながら、全長の削減、各レンズ群の移動量の削減、及び、フォーカスレンズ群の重量及び移動量の削減を図り、レンズ鏡筒全体の更なる小型化の達成を目的とする。 The present invention reduces the overall length and moves each lens group while maintaining high imaging performance especially in a zoom lens having a diagonal angle of view of 5 degrees or less at the telephoto end and a zoom ratio of 3.75 times or more. The purpose is to achieve further reduction in size of the entire lens barrel by reducing the amount and reducing the weight and moving amount of the focus lens group.
本発明の望遠ズームレンズは、物体側より順に、正の屈折力を有する第１レンズ群、負の屈折力を有する第２レンズ群、負の屈折力を有する第３レンズ群、正の屈折力を有する第４レンズ群、負の屈折力を有する第５レンズ群からなり、広角端から望遠端への変倍に際して、第１レンズ群と第２レンズ群との間隔が増大し、第３レンズ群と第４レンズ群との間隔が減少し、第４レンズ群と第５レンズ群との間隔が減少し、第２レンズ群と第３レンズ群との間隔は広角端において最小となり、第５レンズ群は負の屈折力の第５ａレンズ群と負の屈折力の第５ｂレンズ群とからなり、無限遠合焦状態から近距離へのフォーカシングに際して第５ａレンズ群が物体側から像側へ光軸に沿って移動し、以下の条件を満足することを特徴とする。
（１）０．０２３＜｜（ｆ４・ｆ５）／（ｆＷ・ｆＴ)｜＜０．０４４
（２）２．５＜ｆ２／ｆ３＜１０．０
ただし、
ｆ２：第２レンズ群の焦点距離
ｆ３：第３レンズ群の焦点距離
ｆ４：第４レンズ群の焦点距離
ｆ５：第５レンズ群の無限遠合焦時の合成焦点距離
ｆＷ：広角端におけるレンズ全系の合成焦点距離
ｆＴ：望遠端におけるレンズ全系の合成焦点距離
The telephoto zoom lens of the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive refractive power. a fourth lens group having a, and a fifth lens group having negative refractive power, upon zooming from the wide-angle end to the telephoto end, the interval between the first lens group and the second lens group increases, the third lens The distance between the second lens group and the fourth lens group is decreased, the distance between the fourth lens group and the fifth lens group is decreased, and the distance between the second lens group and the third lens group is minimized at the wide angle end. The lens group is composed of a 5a lens group having a negative refractive power and a 5b lens group having a negative refractive power, and the 5a lens group emits light from the object side to the image side during focusing from an infinite focus state to a short distance. It moves along the axis and satisfies the following conditions.
(1) 0.023 <| (f4 · f5) / (fW · fT) | <0.044
(2) 2.5 <f2 / f3 <10.0
However,
f2: Focal length of the second lens group f3: Focal length of the third lens group f4: Focal length of the fourth lens group f5: Synthetic focal length when the fifth lens group is focused at infinity fW: All lenses at the wide-angle end System composite focal length fT: total focal length of the entire lens system at the telephoto end
本発明においてさらに好ましくは、第５ａレンズ群は２枚のレンズによる貼り合わせレンズのみからなることを特徴とする。 In the present invention, it is more preferable that the 5a lens group includes only a cemented lens including two lenses.
本発明においてさらに好ましくは、第５レンズ群の結像倍率が以下の条件を満足することを特徴とする。
（３）２．７＜β５Ｔ＜３．７
ただし、
β５Ｔ：第５レンズ群の望遠端における結像倍率
In the present invention, it is more preferable that the imaging magnification of the fifth lens group satisfies the following condition.
(3) 2.7 <β5T <3.7
However,
β5T: imaging magnification at the telephoto end of the fifth lens unit
本発明においてさらに好ましくは、第２レンズ群は物体側から順に負レンズと正レンズからなり、負レンズのアッベ数をＶｎ、正レンズのアッベ数をＶｐとした時、以下の条件を満足することを特徴とする。
（４）Ｖｎ＜Ｖｐ
ただし、
Ｖｎ：負レンズのアッベ数
Ｖｐ：正レンズのアッベ数
In the present invention, it is more preferable that the second lens group includes a negative lens and a positive lens in order from the object side, and satisfies the following conditions when the negative lens Abbe number is Vn and the positive lens Abbe number is Vp. It is characterized by.
(4) Vn <Vp
However,
Vn: Abbe number of negative lens Vp: Abbe number of positive lens
本発明によれば、望遠端での対角線画角が５度程度以下で、且つ、ズーム比が３．７５倍以上の望遠ズームレンズにおいて、高い結像性能を保持しながら、従来よりもさらなる小型化を達成可能な望遠ズームレンズを提供できる。 According to the present invention, in a telephoto zoom lens having a diagonal angle of view of about 5 degrees or less at the telephoto end and a zoom ratio of 3.75 times or more, while maintaining high imaging performance, it is further compact than conventional ones. It is possible to provide a telephoto zoom lens that can achieve this.
本発明の望遠ズームレンズは、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、負の屈折力を有する第３レンズ群と、正の屈折力を有する第４レンズ群と、負の屈折力を有する第５レンズ群とを備える。 The telephoto zoom lens of the present invention has a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive refractive power. A fourth lens group and a fifth lens group having negative refractive power;
また、広角端状態においては、第１レンズ群から第３レンズ群までが接近してその合成系の屈折力が負となり、第４レンズ群と第５レンズ群とが離れてその合成系の屈折力が正となる。 In the wide-angle end state, the first lens group to the third lens group approach and the refractive power of the combined system becomes negative, and the fourth lens group and the fifth lens group move away to refract the combined system. Power is positive.
また、本発明のズームレンズは、第４レンズ群と第５レンズ群とでテレフォト型の屈折力配置が形成され、広角端における光学系全長の短縮に寄与する。 In the zoom lens according to the present invention, a telephoto type refractive power arrangement is formed by the fourth lens group and the fifth lens group, which contributes to shortening of the total length of the optical system at the wide angle end.
また、望遠端状態においては、第１レンズ群と第２レンズ群とが離れ、第３レンズ群は第２レンズ群から離れて第４レンズ群に接近し、第５レンズ群も第４レンズ群に接近し、第２レンズ群から第５レンズ群までの合成系の屈折力が負となり、第１レンズ群と第２レンズ群から第５レンズ群までの合成系の間にテレフォト型の屈折力配置が形成される。 In the telephoto end state, the first lens group and the second lens group are separated from each other, the third lens group is separated from the second lens group and approaches the fourth lens group, and the fifth lens group is also disposed in the fourth lens group. , The refractive power of the composite system from the second lens group to the fifth lens group becomes negative, and the telephoto type refractive power between the composite system from the first lens group and the second lens group to the fifth lens group An arrangement is formed.
また、第２レンズ群と第３レンズ群の間隔を離すことにより、第２、第３レンズ群の各々のパワーを強めることなく第２、第３レンズ群の合成屈折力を強めることできるので、収差を悪化させることなく、望遠比を小さくすることが可能となる。 Also, by separating the second lens group and the third lens group, the combined refractive power of the second and third lens groups can be increased without increasing the power of each of the second and third lens groups. It is possible to reduce the telephoto ratio without deteriorating the aberration.
また、第２レンズ群の屈折力を第１レンズ群の屈折力と逆符号にすることにより、望遠側における下光線のコマフレアの補正が可能となる。 Further, by making the refractive power of the second lens group opposite to the refractive power of the first lens group, it is possible to correct coma flare of the lower light beam on the telephoto side.
近距離方向へのフォーカシングに際しては、レンズを軽量化するため、なるべく光学系全体において像側寄りのレンズ群の一部を使用することが好ましい。 In focusing in the short distance direction, in order to reduce the weight of the lens, it is preferable to use a part of the lens group closer to the image side as much as possible in the entire optical system.
さらに、フォーカスレンズ群より前の合成系の屈折力が正である場合、負の屈折力を有するレンズ群をフォーカスレンズ群として用いると、フォーカスレンズ群の移動量を削減しやすく、フォーカスレンズ群より後ろにさらに負の屈折力を有するレンズ群があればフォーカスレンズ群の移動量をより一層削減しやすい。 Furthermore, when the refractive power of the composite system before the focus lens group is positive, if a lens group having a negative refractive power is used as the focus lens group, the amount of movement of the focus lens group can be reduced more easily than the focus lens group. If there is a lens group having a negative refractive power behind, it is easier to further reduce the amount of movement of the focus lens group.
このため、本発明の望遠ズームレンズでは、第５レンズ群を負の屈折力の第５ａレンズ群と負の屈折力の第５ｂレンズ群より構成されることとし、第５ａレンズ群によってフォーカシングを行うこととした。 For this reason, in the telephoto zoom lens according to the present invention, the fifth lens group is composed of a 5a lens group having a negative refractive power and a 5b lens group having a negative refractive power, and focusing is performed by the 5a lens group. It was decided.
条件式（１）は、第４レンズ群と第５レンズ群の焦点距離に関する式であり、ズームレンズ全系の広角端における小型化を達成するための好ましい条件を示している。 Conditional expression (1) is an expression relating to the focal lengths of the fourth lens group and the fifth lens group, and shows preferable conditions for achieving miniaturization at the wide-angle end of the entire zoom lens system.
広角端における小型化のためには、第４レンズ群の正の屈折力及び第５レンズ群の負の屈折力を強くすることにより、第４レンズ群と第５レンズ群との間に強いテレフォト型の屈折力配置を形成することが効果的である。 In order to reduce the size at the wide-angle end, the positive refracting power of the fourth lens group and the negative refracting power of the fifth lens group are strengthened, so that a strong telephoto is provided between the fourth lens group and the fifth lens group. It is effective to form a refractive power arrangement of the mold.
条件式（１）の上限を上回ると、第４レンズ群と第５レンズ群のそれぞれの屈折力が弱すぎて光学系全長の短縮が不十分となってしまう。 If the upper limit of conditional expression (1) is exceeded, the respective refractive powers of the fourth lens group and the fifth lens group are too weak, and the total length of the optical system is not sufficiently shortened.
条件式（１）の下限を下回ると、第４レンズ群の正の屈折力と第５レンズ群の負の屈折力がそれぞれ強くなりすぎて球面収差やコマ収差、非点収差等の補正が困難となり、性能が低下してしまう。 If the lower limit of conditional expression (1) is not reached, the positive refractive power of the fourth lens group and the negative refractive power of the fifth lens group become too strong, making it difficult to correct spherical aberration, coma aberration, astigmatism, etc. As a result, the performance deteriorates.
条件式（２）は、第２レンズ群と第３レンズ群の焦点距離の関係を規定する式であり、望遠側でのコマ収差と非点収差補正のための好ましい条件を示す。 Conditional expression (2) defines the relationship between the focal lengths of the second lens group and the third lens group, and shows preferable conditions for correcting coma and astigmatism on the telephoto side.
条件式（２）の上限を上回り、第３レンズ群の負の屈折力が第２レンズ群の負の屈折力を大きく上回ると、第２レンズ群の負の屈折力が相対的に弱まり、望遠側の下光線のコマフレアおよびメリジオナル非点収差の補正能力が無くなる。 When the upper limit of conditional expression (2) is exceeded and the negative refractive power of the third lens group greatly exceeds the negative refractive power of the second lens group, the negative refractive power of the second lens group becomes relatively weak and the telephoto The ability to correct coma flares and meridional astigmatism of the lower side rays is lost.
一方、相対的に負の屈折力が強くなった第３レンズ群の影響により望遠側でのオーバーな球面収差の補正が困難になる。 On the other hand, it is difficult to correct over spherical aberration on the telephoto side due to the influence of the third lens group having a relatively negative refractive power.
条件式（２）の下限を下回り、第２レンズ群の負の屈折力と第３レンズ群の負の屈折力が近づいていくと、第２レンズ群の負の屈折力が相対的に強くなるため、望遠側の下光線のコマフレアがアンダーになり好ましくない。 When the negative refractive power of the second lens group and the negative refractive power of the third lens group approach each other below the lower limit of conditional expression (2), the negative refractive power of the second lens group becomes relatively strong. For this reason, the coma flare of the lower ray on the telephoto side becomes under, which is not preferable.
また、メリジオナル像面についてもプラスにシフトするため、後方のレンズ群での補正をするためにはマイナス方向のメリジオナル像面の成分を無理に発生しなければならず、ズーム全域で非点収差を補正することが困難になる。 Also, since the meridional image plane shifts to the plus side, in order to correct with the rear lens group, a component of the meridional image plane in the minus direction must be generated forcibly, and astigmatism is reduced throughout the zoom range. It becomes difficult to correct.
さらに、第５ａレンズ群を２枚のレンズによる貼り合わせレンズのみから構成することで、フォーカスレンズ群の軽量化が可能である。 Further, the focus lens group can be reduced in weight by configuring the 5a lens group only with a bonded lens composed of two lenses.
さらなるフォーカスレンズ群の軽量化のためには、フォーカスレンズ群を１枚のレンズから構成することも考えられるが、その場合、フォーカスレンズ群単体での色消しが不可能となり、フォーカシングに伴う色収差の変動を抑制することが困難となるので、特に焦点距離の長い望遠レンズには適さない。 In order to further reduce the weight of the focus lens group, it may be possible to construct the focus lens group from a single lens. In this case, however, the focus lens group alone cannot be achromatic, and the chromatic aberration associated with focusing can be reduced. Since it becomes difficult to suppress the fluctuation, it is not particularly suitable for a telephoto lens having a long focal length.
条件式（３）は、第５レンズ群の望遠端における結像倍率を規定し、望遠端側でのフォーカシングに伴う第５ａレンズ群の移動に対する像面の移動量に関する望ましい範囲を示す。 Conditional expression (3) defines the imaging magnification at the telephoto end of the fifth lens group, and indicates a desirable range regarding the amount of movement of the image plane with respect to the movement of the 5a lens group accompanying focusing on the telephoto end side.
条件式（３）の上限を超えて第５レンズ群の倍率の絶対値が大きくなると、第５ａレンズ群の移動量に対して像面の移動量が大きくなり、第５ａレンズ群の停止位置に高い精度が要求されるため、フォーカシングの制御が困難となる。 When the absolute value of the magnification of the fifth lens group increases beyond the upper limit of conditional expression (3), the amount of movement of the image plane increases with respect to the amount of movement of the 5a lens group, and the stop position of the 5a lens group is reached. Since high accuracy is required, it becomes difficult to control focusing.
条件式（３）の下限を超えて第５レンズ群の倍率の絶対値が小さくなると、所定の撮影距離までのフォーカシングに要する第５ａレンズ群の移動量が大きくなるため、フォーカシングの速度が低下し、又は光学系全長の短縮が困難となる。 If the absolute value of the magnification of the fifth lens group becomes smaller than the lower limit of conditional expression (3), the amount of movement of the 5a lens group required for focusing to a predetermined shooting distance increases, and the focusing speed decreases. Or, it becomes difficult to shorten the total length of the optical system.
条件式（４）は、負の屈折力を持つ第２レンズ群の負レンズと正レンズのアッベ数の関係を規定する。 Conditional expression (4) defines the relationship between the Abbe number of the negative lens and the positive lens in the second lens group having negative refractive power.
本条件を満足することにより、第２レンズ群で発生するｇ線の倍率色収差をアンダー、ｇ線の軸上色収差をオーバーにすることにより、広角端では第２レンズ群と第３レンズ群の合成系の倍率の色収差が補正され、望遠端では第１レンズ群乃至第３レンズ群の合成系の倍率の色収差を補正することが可能となる。 By satisfying this condition, the magnification chromatic aberration of the g-line generated in the second lens group is under, and the axial chromatic aberration of the g-line is over, so that the second lens group and the third lens group are combined at the wide angle end. The chromatic aberration of magnification of the system is corrected, and the chromatic aberration of magnification of the combined system of the first lens group to the third lens group can be corrected at the telephoto end.
また、この関係を満足できない場合、特に望遠側のｇ線の倍率色収差がプラスにシフトするとともに、ｇ線の軸上色収差がマイナスにシフトし光学性能の低下が免れない。 If this relationship cannot be satisfied, the lateral chromatic aberration of the g-line on the telephoto side shifts to a plus, and the axial chromatic aberration of the g-line shifts to a minus, so that a decrease in optical performance is inevitable.
以下に本発明の望遠ズームレンズに係る数値実施例１乃至数値実施例６を示す。 Numerical Examples 1 to 6 according to the telephoto zoom lens of the present invention will be described below.
各数値実施例において、［全体諸元］におけるｆは焦点距離、ＦｎｏはＦナンバー、２ωは対角線画角を示し、Ｂｆはバックフォーカスを示す。［レンズ諸元］における第１列の番号は物体側からのレンズ面番号を示し、第２列のＲはレンズ面の曲率半径を示し、第３列のＤはレンズ面間隔を示し、第４列のｎｄはｄ線（波長５８７．５６ｎｍ）の屈折率を示し、第５列のνｄはｄ線基準のアッベ数を示す。また、図中のｄ線、ｇ線、Ｃ線、はそれぞれの波長での収差を示し、ΔＳはｄ線のサジタル像面、ΔＭはｄ線のメリジオナル像面を示す。 In each numerical example, f in [Overall specifications] is a focal length, Fno is an F number, 2ω is a diagonal angle of view, and Bf is a back focus. The number in the first column in [Lens Specifications] indicates the lens surface number from the object side, R in the second column indicates the radius of curvature of the lens surface, D in the third column indicates the lens surface interval, The column nd represents the refractive index of the d-line (wavelength 587.56 nm), and the fifth column νd represents the Abbe number based on the d-line. In the figure, d-line, g-line, and C-line indicate aberrations at respective wavelengths, ΔS indicates a sagittal image plane of d-line, and ΔM indicates a meridional image plane of d-line.
各数値実施例の変倍光学系は上記のすべての条件を満足する。 The variable magnification optical system of each numerical example satisfies all the above conditions.
また、各実施例においては第２レンズ群がズーミングに際して移動しない。第２レンズ群の移動に要するカムなどの機構が不要となるので、レンズ鏡筒の小型化において有利となる。ズーミングに際して移動するレンズ群は４つであるため、レンズ群の数を増加させながらも、従来の４群構成のズームレンズと比較して機構が複雑となってしまうことを避けている。 In each embodiment, the second lens group does not move during zooming. A mechanism such as a cam required for moving the second lens group is not necessary, which is advantageous in reducing the size of the lens barrel. Since the number of lens groups that move during zooming is four, the mechanism is avoided from becoming complicated compared to a conventional zoom lens having a four-group configuration, while increasing the number of lens groups.
また、各実施例において、第５レンズ群と結像面の間に配置されている平行平面板はローパスフィルタである。 In each embodiment, the plane parallel plate disposed between the fifth lens group and the image plane is a low-pass filter.
また、各実施例において、バックフォーカスとはローパスフィルタの像側の面と結像面の間の距離を示す。 In each embodiment, the back focus indicates the distance between the image-side surface of the low-pass filter and the imaging surface.
実施例１の望遠ズームレンズは、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、負の屈折力を有する第３レンズ群と、正の屈折力を有する第４レンズ群と、負の屈折力を有する第５レンズ群とを備える。第１レンズ群は物体側に凸面を向けた凹メニスカスレンズと両凸レンズの張り合わせレンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第２レンズ群は両凹レンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第３レンズ群は両凹レンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第４レンズ群は両凸レンズ、両凸レンズ、両凹レンズと両凸レンズの張り合わせレンズ、両凸レンズから成り、第５レンズ群はフォーカシング時に移動する負の屈折力の第５ａレンズ群と負の屈折力の第５ｂレンズ群とからなる。第５ａレンズ群は両凸レンズと両凹レンズの張り合わせレンズから成り、第５ｂレンズ群は物体側に凸面を向けた凸メニスカスレンズ、両凹レンズから成る。 The telephoto zoom lens of Example 1 includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive refractive power. And a fifth lens group having a negative refractive power. The first lens group is composed of a concave meniscus lens having a convex surface facing the object side and a cemented lens of a biconvex lens, and a convex meniscus lens having a convex surface facing the object side. The second lens group is a biconcave lens, with the convex surface facing the object side. Consisting of a convex meniscus lens, the third lens group is composed of a biconcave lens, a convex meniscus lens having a convex surface facing the object side, and the fourth lens group is composed of a biconvex lens, a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens. The fifth lens group includes a negative power 5a lens group that moves during focusing and a negative power 5b lens group. The 5a lens group is composed of a cemented lens of a biconvex lens and a biconcave lens, and the 5b lens group is composed of a convex meniscus lens having a convex surface facing the object side and a biconcave lens.
［レンズ諸元］
Ｒ Ｄ ｎｄ νｄ
[物面] ∞ ∞
[1] 70.8737 2.3331 1.80610 33.27
[2] 51.7176 6.4265 1.45650 90.27
[3] -912.9285 0.1414
[4] 106.8054 3.5272 1.49700 81.61
[5] 2593.7241 可変
[6] -93.0537 1.2726 1.77250 49.62
[7] 57.1372 0.1500
[8] 25.1435 2.9894 1.48749 70.44
[9] 97.8762 可変
[10] -52.0887 1.2019 1.77250 49.62
[11] 23.2250 1.4000
[12] 28.0589 2.5650 1.84666 23.78
[13] 195.0438 可変
[14]（絞り） 56.5020 3.2885 1.48749 70.44
[15] -69.2014 0.4086
[16] 52.4187 4.4112 1.48749 70.44
[17] -28.4291 1.4289
[18] -27.6560 1.2019 1.91082 35.25
[19] 22.9802 4.8695 1.58144 40.89
[20] -43.0590 0.1500
[21] 27.1011 4.6621 1.48749 70.44
[22] -55.3328 可変
[23] 55.8868 2.4871 1.84666 23.78
[24] -224.3124 1.0000 1.77250 49.62
[25] 20.2224 可変
[26] 85.1592 1.9792 1.72825 28.32
[27] 194.8485 2.0000
[28] -31.9287 1.0000 1.77250 49.62
[29] 1697.5062 可変
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[像面] ∞
［全体諸元］
広角端 中望遠 望遠端
ｆ 71.26 140.37 290.98
Ｆｎｏ 5.09 5.62 6.62
２ω 17.3 8.7 4.2
像高 10.82 10.82 10.82
レンズ全長 134.00 158.80 179.00
Ｂｆ 0.90 0.90 0.90
［無限遠合焦時の可変間隔］
広角端 中望遠 望遠端
d5 3.6100 28.4100 48.6500
d9 5.0000 16.1200 18.4700
d13 23.9400 11.1400 4.0500
d22 15.1700 12.9600 2.0000
d25 11.8500 11.8500 11.8500
d29 18.5000 22.3900 38.0500
[ズームレンズ群データ]
群 始面 焦点距離
1 1 105.26
2 6 -135.41
3 10 -48.36
4 14 30.15
5 23 -21.23
［条件式対応値］
実施例１
条件式（１） |(f4・ｆ5)/(fW・fT)| 0.031
条件式（２） f2/f3 2.80
条件式（３） β5T 3.26
条件式（４） Vn 49.62
Vp 70.44
[Lens specifications]
R D nd νd
[Object] ∞ ∞
[1] 70.8737 2.3331 1.80610 33.27
[2] 51.7176 6.4265 1.45650 90.27
[3] -912.9285 0.1414
[4] 106.8054 3.5272 1.49700 81.61
[5] 2593.7241 Variable
[6] -93.0537 1.2726 1.77250 49.62
[7] 57.1372 0.1500
[8] 25.1435 2.9894 1.48749 70.44
[9] 97.8762 Variable
[10] -52.0887 1.2019 1.77250 49.62
[11] 23.2250 1.4000
[12] 28.0589 2.5650 1.84666 23.78
[13] 195.0438 Variable
[14] (Aperture) 56.5020 3.2885 1.48749 70.44
[15] -69.2014 0.4086
[16] 52.4187 4.4112 1.48749 70.44
[17] -28.4291 1.4289
[18] -27.6560 1.2019 1.91082 35.25
[19] 22.9802 4.8695 1.58144 40.89
[20] -43.0590 0.1500
[21] 27.1011 4.6621 1.48749 70.44
[22] -55.3328 Variable
[23] 55.8868 2.4871 1.84666 23.78
[24] -224.3124 1.0000 1.77250 49.62
[25] 20.2224 Variable
[26] 85.1592 1.9792 1.72825 28.32
[27] 194.8485 2.0000
[28] -31.9287 1.0000 1.77250 49.62
[29] 1697.5062 Variable
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[Image plane] ∞
[Overall specifications]
Wide angle end Medium telephoto Telephoto end f 71.26 140.37 290.98
Fno 5.09 5.62 6.62
2ω 17.3 8.7 4.2
Image height 10.82 10.82 10.82
Total lens length 134.00 158.80 179.00
Bf 0.90 0.90 0.90
[Variable interval when focusing at infinity]
Wide angle end Medium telephoto Telephoto end
d5 3.6100 28.4100 48.6500
d9 5.0000 16.1200 18.4700
d13 23.9400 11.1400 4.0500
d22 15.1700 12.9600 2.0000
d25 11.8500 11.8500 11.8500
d29 18.5000 22.3900 38.0500
[Zoom lens group data]
Group Start surface Focal length
1 1 105.26
2 6 -135.41
3 10 -48.36
4 14 30.15
5 23 -21.23
[Conditional expression values]
Example 1
Conditional expression (1) | (f4 ・ f5) / (fW ・ fT) | 0.031
Conditional expression (2) f2 / f3 2.80
Conditional expression (3) β5T 3.26
Conditional expression (4) Vn 49.62
Vp 70.44
実施例２の望遠ズームレンズは、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、負の屈折力を有する第３レンズ群と、正の屈折力を有する第４レンズ群と、負の屈折力を有する第５レンズ群とを備える。第１レンズ群は物体側に凸面を向けた凹メニスカスレンズと両凸レンズの張り合わせレンズ、両凸レンズから成り、第２レンズ群は両凹レンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第３レンズ群は両凹レンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第４レンズ群は両凸レンズ、両凸レンズ、両凹レンズと両凸レンズの張り合わせレンズ、両凸レンズから成り、第５レンズ群はフォーカシング時に移動する負の屈折力の第５ａレンズ群と負の屈折力の第５ｂレンズ群とからなる。第５ａレンズ群は両凸レンズと両凹レンズの張り合わせレンズから成り、第５ｂレンズ群は像側に凸面を向けた凸メニスカスレンズ、両凹レンズから成る。 The telephoto zoom lens of Example 2 has a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive refractive power. And a fifth lens group having a negative refractive power. The first lens group includes a concave meniscus lens having a convex surface facing the object side, a cemented lens of a biconvex lens, and a biconvex lens. The second lens group includes a biconcave lens and a convex meniscus lens having a convex surface directed to the object side. The lens group consists of a biconcave lens and a convex meniscus lens with a convex surface facing the object side. The fourth lens group consists of a biconvex lens, a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens. The fifth lens group is a focusing lens. It consists of a 5a lens group having a negative refractive power and a 5b lens group having a negative refractive power that move sometimes. The 5a lens group is composed of a cemented lens of a biconvex lens and a biconcave lens, and the 5b lens group is composed of a convex meniscus lens and a biconcave lens having a convex surface facing the image side.
［レンズ諸元］
Ｒ Ｄ ｎｄ νｄ
[物面] ∞ ∞
[1] 74.6783 2.3331 1.80609 33.27
[2] 53.5609 6.4265 1.45650 90.27
[3] -590.2734 0.1414
[4] 114.7515 3.5272 1.49700 81.61
[5] -3902.0618 可変
[6] -80.3294 1.2726 1.77250 49.62
[7] 62.1258 0.1500
[8] 25.8960 3.1585 1.48749 70.44
[9] 141.1185 可変
[10] -56.8832 1.2019 1.77250 49.62
[11] 21.7810 1.4000
[12] 26.0097 2.5468 1.84666 23.78
[13] 122.0907 可変
[14]（絞り） 105.5127 3.6264 1.48749 70.44
[15] -50.4911 0.4086
[16] 42.3313 4.6964 1.48749 70.44
[17] -28.9430 1.4614
[18] -27.5979 1.2019 1.91082 35.25
[19] 21.9916 5.0270 1.58144 40.89
[20] -45.3911 0.1500
[21] 26.7717 5.0890 1.48749 70.44
[22] -45.2800 可変
[23] 72.6642 2.6445 1.84666 23.78
[24] -76.7382 1.0000 1.77250 49.62
[25] 22.7119 可変
[26] -173.5283 2.5056 1.72824 28.32
[27] -30.6501 2.0000
[28] -22.5615 1.0000 1.91082 35.25
[29] 150.0000 可変
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[像面] ∞
［全体諸元］
広角端 中望遠 望遠端
ｆ 71.39 140.30 291.26
Ｆｎｏ 5.11 5.53 6.65
２ω 17.2 8.7 4.2
像高 10.82 10.82 10.82
レンズ全長 133.99 159.31 179.01
Ｂｆ 0.89 0.89 0.89
［無限遠合焦時の可変間隔］
広角端 中望遠 望遠端
d5 3.6600 28.9600 48.6900
d9 4.8400 16.6800 19.0700
d13 23.4500 10.9800 4.4400
d22 13.5500 11.7400 2.0000
d25 11.9900 11.9900 11.9900
d29 18.5000 20.9600 34.8200
[ズームレンズ群データ]
群 始面 焦点距離
1 1 106.27
2 6 -150.78
3 10 -45.69
4 14 29.25
5 23 -18.49
［条件式対応値］
実施例２
条件式（１） |(f4・ｆ5)/(fW・fT)| 0.026
条件式（２） f2/f3 3.30
条件式（３） β5T 3.36
条件式（４） Vn 49.62
Vp 70.44
[Lens specifications]
R D nd νd
[Object] ∞ ∞
[1] 74.6783 2.3331 1.80609 33.27
[2] 53.5609 6.4265 1.45650 90.27
[3] -590.2734 0.1414
[4] 114.7515 3.5272 1.49700 81.61
[5] -3902.0618 Variable
[6] -80.3294 1.2726 1.77250 49.62
[7] 62.1258 0.1500
[8] 25.8960 3.1585 1.48749 70.44
[9] 141.1185 Variable
[10] -56.8832 1.2019 1.77250 49.62
[11] 21.7810 1.4000
[12] 26.0097 2.5468 1.84666 23.78
[13] 122.0907 Variable
[14] (Aperture) 105.5127 3.6264 1.48749 70.44
[15] -50.4911 0.4086
[16] 42.3313 4.6964 1.48749 70.44
[17] -28.9430 1.4614
[18] -27.5979 1.2019 1.91082 35.25
[19] 21.9916 5.0270 1.58144 40.89
[20] -45.3911 0.1500
[21] 26.7717 5.0890 1.48749 70.44
[22] -45.2800 variable
[23] 72.6642 2.6445 1.84666 23.78
[24] -76.7382 1.0000 1.77250 49.62
[25] 22.7119 Variable
[26] -173.5283 2.5056 1.72824 28.32
[27] -30.6501 2.0000
[28] -22.5615 1.0000 1.91082 35.25
[29] 150.0000 variable
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[Image plane] ∞
[Overall specifications]
Wide angle end Medium telephoto Telephoto end f 71.39 140.30 291.26
Fno 5.11 5.53 6.65
2ω 17.2 8.7 4.2
Image height 10.82 10.82 10.82
Total lens length 133.99 159.31 179.01
Bf 0.89 0.89 0.89
[Variable interval when focusing at infinity]
Wide angle end Medium telephoto Telephoto end
d5 3.6600 28.9600 48.6900
d9 4.8400 16.6800 19.0700
d13 23.4500 10.9800 4.4400
d22 13.5500 11.7400 2.0000
d25 11.9900 11.9900 11.9900
d29 18.5000 20.9600 34.8200
[Zoom lens group data]
Group Start surface Focal length
1 1 106.27
2 6 -150.78
3 10 -45.69
4 14 29.25
5 23 -18.49
[Conditional expression values]
Example 2
Conditional expression (1) | (f4 ・ f5) / (fW ・ fT) | 0.026
Conditional expression (2) f2 / f3 3.30
Conditional expression (3) β5T 3.36
Conditional expression (4) Vn 49.62
Vp 70.44
実施例３の望遠ズームレンズは、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、負の屈折力を有する第３レンズ群と、正の屈折力を有する第４レンズ群と、負の屈折力を有する第５レンズ群とを備える。第１レンズ群は物体側に凸面を向けた凹メニスカスレンズと両凸レンズの張り合わせレンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第２レンズ群は両凹レンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第３レンズ群は両凹レンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第４レンズ群は両凸レンズ、両凸レンズ、両凹レンズと両凸レンズの張り合わせレンズ、両凸レンズから成り、第５レンズ群はフォーカシング時に移動する負の屈折力の第５ａレンズ群と負の屈折力の第５ｂレンズ群とからなる。第５ａレンズ群は両凸レンズと両凹レンズの張り合わせレンズから成り、第５ｂレンズ群は物体側に凸面を向けた凸メニスカスレンズ、両凹レンズから成る。 The telephoto zoom lens of Example 3 has a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive refractive power. And a fifth lens group having a negative refractive power. The first lens group is composed of a concave meniscus lens having a convex surface facing the object side and a cemented lens of a biconvex lens, and a convex meniscus lens having a convex surface facing the object side. The second lens group is a biconcave lens, with the convex surface facing the object side. Consisting of a convex meniscus lens, the third lens group is composed of a biconcave lens, a convex meniscus lens having a convex surface facing the object side, and the fourth lens group is composed of a biconvex lens, a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens. The fifth lens group includes a negative power 5a lens group that moves during focusing and a negative power 5b lens group. The 5a lens group is composed of a cemented lens of a biconvex lens and a biconcave lens, and the 5b lens group is composed of a convex meniscus lens having a convex surface facing the object side and a biconcave lens.
［レンズ諸元］
Ｒ Ｄ ｎｄ νｄ
[物面] ∞ ∞
[1] 74.1503 2.3331 1.83400 37.34
[2] 51.1132 6.4265 1.49700 81.61
[3] -996.6214 0.1414
[4] 103.6421 3.5272 1.45650 90.27
[5] 1726.9589 可変
[6] -148.7612 1.2726 1.80420 46.50
[7] 51.6258 0.1500
[8] 25.0553 3.2160 1.48749 70.44
[9] 121.6614 可変
[10] -44.3400 1.2019 1.77250 49.62
[11] 22.9034 1.4000
[12] 27.4958 2.6412 1.84666 23.78
[13] 252.5091 可変
[14]（絞り） 55.0286 3.2789 1.48749 70.44
[15] -67.2123 0.5202
[16] 61.9089 4.2159 1.48749 70.44
[17] -27.8188 1.4368
[18] -27.0208 1.2019 1.91082 35.25
[19] 23.8153 4.8522 1.56732 42.84
[20] -38.2840 0.1500
[21] 26.0671 4.6085 1.48749 70.44
[22] -60.3111 可変
[23] 63.8009 2.4857 1.84666 23.78
[24] -143.2704 1.0000 1.77250 49.62
[25] 21.6948 可変
[26] 76.6469 2.0240 1.76181 26.61
[27] 216.4878 2.0000
[28] -29.5207 1.0000 1.77250 49.62
[29] 436.5947 可変
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[像面] ∞
［全体諸元］
広角端 中望遠 望遠端
Ｆ 71.22 139.74 289.70
Ｆｎｏ 5.11 5.50 6.58
２ω 17.3 8.7 4.2
像高 10.82 10.82 10.82
レンズ全長 133.99 159.31 179.01
Ｂｆ 0.90 0.90 0.90
[可変間隔]
広角端 中望遠 望遠端
d5 3.4100 30.6200 48.5100
d9 4.9000 14.5200 19.0600
d13 24.3900 14.0400 4.0000
d22 14.8600 11.6800 2.0000
d25 11.8200 11.8200 11.8200
d29 18.5000 22.3800 37.5200
ズームレンズ群データ
群 始面 焦点距離
1 1 108.35
2 6 -181.88
3 10 -45.68
4 14 30.12
5 23 -20.71
［条件式対応値］
実施例３
条件式（１） |(f4・ｆ5)/(fW・fT)| 0.030
条件式（２） f2/f3 3.98
条件式（３） β5T 3.27
条件式（４） Vn 46.50
Vp 70.44
[Lens specifications]
R D nd νd
[Object] ∞ ∞
[1] 74.1503 2.3331 1.83400 37.34
[2] 51.1132 6.4265 1.49700 81.61
[3] -996.6214 0.1414
[4] 103.6421 3.5272 1.45650 90.27
[5] 1726.9589 Variable
[6] -148.7612 1.2726 1.80420 46.50
[7] 51.6258 0.1500
[8] 25.0553 3.2160 1.48749 70.44
[9] 121.6614 Variable
[10] -44.3400 1.2019 1.77250 49.62
[11] 22.9034 1.4000
[12] 27.4958 2.6412 1.84666 23.78
[13] 252.5091 Variable
[14] (Aperture) 55.0286 3.2789 1.48749 70.44
[15] -67.2123 0.5202
[16] 61.9089 4.2159 1.48749 70.44
[17] -27.8188 1.4368
[18] -27.0208 1.2019 1.91082 35.25
[19] 23.8153 4.8522 1.56732 42.84
[20] -38.2840 0.1500
[21] 26.0671 4.6085 1.48749 70.44
[22] -60.3111 variable
[23] 63.8009 2.4857 1.84666 23.78
[24] -143.2704 1.0000 1.77250 49.62
[25] 21.6948 Variable
[26] 76.6469 2.0240 1.76181 26.61
[27] 216.4878 2.0000
[28] -29.5207 1.0000 1.77250 49.62
[29] 436.5947 Variable
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[Image plane] ∞
[Overall specifications]
Wide angle end Medium telephoto Telephoto end F 71.22 139.74 289.70
Fno 5.11 5.50 6.58
2ω 17.3 8.7 4.2
Image height 10.82 10.82 10.82
Total lens length 133.99 159.31 179.01
Bf 0.90 0.90 0.90
[Variable interval]
Wide angle end Medium telephoto Telephoto end
d5 3.4100 30.6200 48.5100
d9 4.9000 14.5200 19.0600
d13 24.3900 14.0400 4.0000
d22 14.8600 11.6800 2.0000
d25 11.8200 11.8200 11.8200
d29 18.5000 22.3800 37.5200
Zoom lens group data Group Start surface Focal length
1 1 108.35
2 6 -181.88
3 10 -45.68
4 14 30.12
5 23 -20.71
[Conditional expression values]
Example 3
Conditional expression (1) | (f4 ・ f5) / (fW ・ fT) | 0.030
Conditional expression (2) f2 / f3 3.98
Conditional expression (3) β5T 3.27
Conditional expression (4) Vn 46.50
Vp 70.44
実施例４の望遠ズームレンズは、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、負の屈折力を有する第３レンズ群と、正の屈折力を有する第４レンズ群と、負の屈折力を有する第５レンズ群とを備える。第１レンズ群は物体側に凸面を向けた凹メニスカスレンズと物体側に凸面を向けた凸メニスカスレンズの張り合わせレンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第２レンズ群は物体側に凸面を向けた凹メニスカスレンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第３レンズ群は両凹レンズ、両凸レンズから成り、第４レンズ群は両凸レンズ、両凸レンズ、両凹レンズと両凸レンズの張り合わせレンズ、両凸レンズから成り、第５レンズ群はフォーカシング時に移動する負の屈折力の第５ａレンズ群と負の屈折力の第５ｂレンズ群とからなる。第５ａレンズ群は両凸レンズと両凹レンズの張り合わせレンズから成り、第５ｂレンズ群は物体側に凸面を向けた凸メニスカスレンズ、両凹レンズから成る。 The telephoto zoom lens of Example 4 includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive refractive power. And a fifth lens group having a negative refractive power. The first lens group is composed of a cemented lens of a concave meniscus lens having a convex surface facing the object side, a convex meniscus lens having a convex surface facing the object side, and a convex meniscus lens having a convex surface facing the object side. A concave meniscus lens with a convex surface facing the surface, a convex meniscus lens with a convex surface facing the object side, the third lens group is composed of a biconcave lens and a biconvex lens, and the fourth lens group is a biconvex lens, a biconvex lens, a biconcave lens and both The fifth lens unit is composed of a negative refractive power 5a lens unit and a negative refractive power 5b lens unit that move during focusing. The 5a lens group is composed of a cemented lens of a biconvex lens and a biconcave lens, and the 5b lens group is composed of a convex meniscus lens having a convex surface facing the object side and a biconcave lens.
［レンズ諸元］
Ｒ Ｄ ｎｄ νｄ
[物面] ∞ ∞
[1] 64.2092 2.3331 1.80609 33.27
[2] 47.9915 6.4265 1.45650 90.27
[3] 2302.0037 0.1414
[4] 73.2637 3.5272 1.49700 81.61
[5] 210.0178 可変
[6] 330.9358 1.2726 1.77250 49.62
[7] 28.2975 0.1500
[8] 21.5661 3.3122 1.48749 70.44
[9] 105.1820 可変
[10] -29.9071 1.2019 1.77250 49.62
[11] 29.6586 1.4000
[12] 36.7918 2.5557 1.84666 23.78
[13] -219.9961 可変
[14]（絞り） 43.0113 4.0229 1.48749 70.44
[15] -44.7790 0.1000
[16] 55.1486 4.0401 1.48749 70.44
[17] -34.7357 1.6023
[18] -30.0763 1.2019 1.91082 35.25
[19] 26.0345 4.1668 1.58144 40.89
[20] -55.8082 0.1500
[21] 32.7581 3.6881 1.48749 70.44
[22] -78.7214 可変
[23] 66.1578 2.2728 1.84666 23.78
[24] -992.0447 1.0000 1.77250 49.62
[25] 20.8623 可変
[26] 28.1347 2.0015 1.72824 28.32
[27] 32.8123 2.0000
[28] -49.8839 1.0000 1.56384 60.83
[29] 150.0000 可変
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[像面] ∞
［全体諸元］
広角端 中望遠 望遠端
ｆ 71.04 139.52 289.94
Ｆｎｏ 5.30 5.42 6.74
２ω 17.4 8.8 4.2
像高 10.82 10.82 10.82
レンズ全長 134.00 162.68 179.00
Ｂｆ 0.90 0.90 0.90
[無限遠合焦時の可変間隔]
広角端 中望遠 望遠端
d5 3.1300 31.8500 48.1300
d9 4.9300 14.8000 16.3600
d13 23.7600 14.9500 3.4800
d22 17.4700 13.1900 2.0000
d25 11.6000 11.6000 11.6000
d29 18.5000 21.6900 42.8300
[ズームレンズ群データ]
群 始面 焦点距離
1 1 105.26
2 6 -144.18
3 10 -43.69
4 14 31.09
5 23 -26.50
［条件式対応値］
実施例４
条件式（１） |(f4・ｆ5)/(fW・fT)| 0.040
条件式（２） f2/f3 3.30
条件式（３） β5T 3.05
条件式（４） Vn 49.62
Vp 70.44
[Lens specifications]
R D nd νd
[Object] ∞ ∞
[1] 64.2092 2.3331 1.80609 33.27
[2] 47.9915 6.4265 1.45650 90.27
[3] 2302.0037 0.1414
[4] 73.2637 3.5272 1.49700 81.61
[5] 210.0178 Variable
[6] 330.9358 1.2726 1.77250 49.62
[7] 28.2975 0.1500
[8] 21.5661 3.3122 1.48749 70.44
[9] 105.1820 Variable
[10] -29.9071 1.2019 1.77250 49.62
[11] 29.6586 1.4000
[12] 36.7918 2.5557 1.84666 23.78
[13] -219.9961 Variable
[14] (Aperture) 43.0113 4.0229 1.48749 70.44
[15] -44.7790 0.1000
[16] 55.1486 4.0401 1.48749 70.44
[17] -34.7357 1.6023
[18] -30.0763 1.2019 1.91082 35.25
[19] 26.0345 4.1668 1.58144 40.89
[20] -55.8082 0.1500
[21] 32.7581 3.6881 1.48749 70.44
[22] -78.7214 Variable
[23] 66.1578 2.2728 1.84666 23.78
[24] -992.0447 1.0000 1.77250 49.62
[25] 20.8623 Variable
[26] 28.1347 2.0015 1.72824 28.32
[27] 32.8123 2.0000
[28] -49.8839 1.0000 1.56384 60.83
[29] 150.0000 variable
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[Image plane] ∞
[Overall specifications]
Wide angle end Medium telephoto Telephoto end f 71.04 139.52 289.94
Fno 5.30 5.42 6.74
2ω 17.4 8.8 4.2
Image height 10.82 10.82 10.82
Total lens length 134.00 162.68 179.00
Bf 0.90 0.90 0.90
[Variable interval when focusing at infinity]
Wide angle end Medium telephoto Telephoto end
d5 3.1300 31.8500 48.1300
d9 4.9300 14.8000 16.3600
d13 23.7600 14.9500 3.4800
d22 17.4700 13.1900 2.0000
d25 11.6000 11.6000 11.6000
d29 18.5000 21.6900 42.8300
[Zoom lens group data]
Group Start surface Focal length
1 1 105.26
2 6 -144.18
3 10 -43.69
4 14 31.09
5 23 -26.50
[Conditional expression values]
Example 4
Conditional expression (1) | (f4 ・ f5) / (fW ・ fT) | 0.040
Conditional expression (2) f2 / f3 3.30
Conditional expression (3) β5T 3.05
Conditional expression (4) Vn 49.62
Vp 70.44
実施例５の望遠ズームレンズは、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、負の屈折力を有する第３レンズ群と、正の屈折力を有する第４レンズ群と、負の屈折力を有する第５レンズ群とを備える。第１レンズ群は物体側に凸面を向けた凹メニスカスレンズと物体側に凸面を向けた凸メニスカスレンズの張り合わせレンズ、両凸レンズから成り、第２レンズ群は両凹レンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第３レンズ群は両凹レンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第４レンズ群は両凸レンズ、両凸レンズ、両凹レンズと両凸レンズの張り合わせレンズ、両凸レンズから成り、第５レンズ群はフォーカシング時に移動する負の屈折力の第５ａレンズ群と負の屈折力の第５ｂレンズ群とからなる。第５ａレンズ群は両凸レンズと両凹レンズの張り合わせレンズから成り、第５ｂレンズ群は物体側に凸面を向けた凸メニスカスレンズ、両凹レンズから成る。 The telephoto zoom lens of Example 5 includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive refractive power. And a fifth lens group having a negative refractive power. The first lens group consists of a concave meniscus lens having a convex surface facing the object side, a cemented lens of a convex meniscus lens having a convex surface facing the object side, and a biconvex lens. The second lens group has a biconcave lens and a convex surface facing the object side. Consisting of a convex meniscus lens, the third lens group is composed of a biconcave lens, a convex meniscus lens having a convex surface facing the object side, and the fourth lens group is composed of a biconvex lens, a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens. The fifth lens group includes a negative power 5a lens group that moves during focusing and a negative power 5b lens group. The 5a lens group is composed of a cemented lens of a biconvex lens and a biconcave lens, and the 5b lens group is composed of a convex meniscus lens having a convex surface facing the object side and a biconcave lens.
［レンズ諸元］
Ｒ Ｄ ｎｄ νｄ
[物面] ∞ ∞
[1] 84.7957 2.3331 1.83400 37.34
[2] 53.8899 5.8215 1.49700 81.61
[3] 1481.6593 0.1414
[4] 81.3144 4.6749 1.45650 90.27
[5] -611.4887 可変
[6] -147.5808 1.2726 1.75500 52.32
[7] 45.2446 0.1500
[8] 23.8533 3.6070 1.48749 70.44
[9] 166.7574 可変
[10] -42.0874 1.2019 1.77250 49.62
[11] 22.1075 1.4000
[12] 26.4252 2.5496 1.84666 23.78
[13] 153.8099 可変
[14]（絞り） 142.5760 2.8911 1.48749 70.44
[15] -56.4211 2.8591
[16] 47.4649 4.3838 1.48749 70.44
[17] -26.2228 1.3510
[18] -25.8681 1.2019 1.91082 35.25
[19] 25.2369 4.3802 1.53172 48.84
[20] -33.8784 0.1500
[21] 26.6407 4.0085 1.51742 52.15
[22] -54.4698 可変
[23] 63.8907 2.3969 1.84666 23.78
[24] -141.3098 1.0000 1.77250 49.62
[25] 21.1688 可変
[26] 27.8712 2.0999 1.62588 35.74
[27] 39.7589 2.0000
[28] -31.6146 1.0000 1.77250 49.62
[29] 367.4043 可変
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[像面] ∞
［全体諸元］
広角端 中望遠 望遠端
ｆ 71.18 140.09 291.01
Ｆｎｏ 5.05 5.47 6.61
２ω 17.4 8.7 4.2
像高 10.82 10.82 10.82
レンズ全長 134.00 160.14 179.00
Ｂｆ 0.95 0.95 0.95
[可変間隔]
広角端 中望遠 望遠端
d5 3.2700 29.4100 48.2900
d9 4.7800 12.5100 16.6500
d13 21.2600 12.1300 4.4800
d22 16.4400 12.9700 2.0000
d25 11.2800 11.2800 11.2800
d29 19.0000 23.8900 38.3300
[ズームレンズ群データ]
群 始面 焦点距離
1 1 105.26
2 6 -235.97
3 10 -39.98
4 14 29.96
5 23 -21.51
［条件式対応値］
実施例５
条件式（１） |(f4・ｆ5)/(fW・fT)| 0.026
条件式（２） f2/f3 3.30
条件式（３） β5T 3.36
条件式（４） Vn 52.32
Vp 70.44
[Lens specifications]
R D nd νd
[Object] ∞ ∞
[1] 84.7957 2.3331 1.83400 37.34
[2] 53.8899 5.8215 1.49700 81.61
[3] 1481.6593 0.1414
[4] 81.3144 4.6749 1.45650 90.27
[5] -611.4887 Variable
[6] -147.5808 1.2726 1.75500 52.32
[7] 45.2446 0.1500
[8] 23.8533 3.6070 1.48749 70.44
[9] 166.7574 Variable
[10] -42.0874 1.2019 1.77250 49.62
[11] 22.1075 1.4000
[12] 26.4252 2.5496 1.84666 23.78
[13] 153.8099 Variable
[14] (Aperture) 142.5760 2.8911 1.48749 70.44
[15] -56.4211 2.8591
[16] 47.4649 4.3838 1.48749 70.44
[17] -26.2228 1.3510
[18] -25.8681 1.2019 1.91082 35.25
[19] 25.2369 4.3802 1.53172 48.84
[20] -33.8784 0.1500
[21] 26.6407 4.0085 1.51742 52.15
[22] -54.4698 Variable
[23] 63.8907 2.3969 1.84666 23.78
[24] -141.3098 1.0000 1.77250 49.62
[25] 21.1688 Variable
[26] 27.8712 2.0999 1.62588 35.74
[27] 39.7589 2.0000
[28] -31.6146 1.0000 1.77250 49.62
[29] 367.4043 Variable
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[Image plane] ∞
[Overall specifications]
Wide angle end Medium telephoto Telephoto end f 71.18 140.09 291.01
Fno 5.05 5.47 6.61
2ω 17.4 8.7 4.2
Image height 10.82 10.82 10.82
Total lens length 134.00 160.14 179.00
Bf 0.95 0.95 0.95
[Variable interval]
Wide angle end Medium telephoto Telephoto end
d5 3.2700 29.4100 48.2900
d9 4.7800 12.5100 16.6500
d13 21.2600 12.1300 4.4800
d22 16.4400 12.9700 2.0000
d25 11.2800 11.2800 11.2800
d29 19.0000 23.8900 38.3300
[Zoom lens group data]
Group Start surface Focal length
1 1 105.26
2 6 -235.97
3 10 -39.98
4 14 29.96
5 23 -21.51
[Conditional expression values]
Example 5
Conditional expression (1) | (f4 ・ f5) / (fW ・ fT) | 0.026
Conditional expression (2) f2 / f3 3.30
Conditional expression (3) β5T 3.36
Conditional expression (4) Vn 52.32
Vp 70.44
実施例６の望遠ズームレンズは、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、負の屈折力を有する第３レンズ群と、正の屈折力を有する第４レンズ群と、負の屈折力を有する第５レンズ群とを備える。第１レンズ群は物体側に凸面を向けた凹メニスカスレンズと両凸レンズの張り合わせレンズ、両凸レンズから成り、第２レンズ群は両凹レンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第３レンズ群は両凹レンズ、物体側に凸面を向けた凸メニスカスレンズから成り、第４レンズ群は両凸レンズ、両凸レンズ、両凹レンズと両凸レンズの張り合わせレンズ、両凸レンズから成り、第５レンズ群はフォーカシング時に移動する負の屈折力の第５ａレンズ群と負の屈折力の第５ｂレンズ群とからなる。第５ａレンズ群は両凸レンズと両凹レンズの張り合わせレンズから成り、第５ｂレンズ群は物体側に凸面を向けた凸メニスカスレンズ、両凹レンズから成る。 The telephoto zoom lens of Example 6 includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, and a positive refractive power. And a fifth lens group having a negative refractive power. The first lens group includes a concave meniscus lens having a convex surface facing the object side, a cemented lens of a biconvex lens, and a biconvex lens. The second lens group includes a biconcave lens and a convex meniscus lens having a convex surface directed to the object side. The lens group consists of a biconcave lens and a convex meniscus lens with a convex surface facing the object side. The fourth lens group consists of a biconvex lens, a biconvex lens, a cemented lens of a biconcave lens and a biconvex lens, and a biconvex lens. The fifth lens group is a focusing lens. It consists of a 5a lens group having a negative refractive power and a 5b lens group having a negative refractive power that move sometimes. The 5a lens group is composed of a cemented lens of a biconvex lens and a biconcave lens, and the 5b lens group is composed of a convex meniscus lens having a convex surface facing the object side and a biconcave lens.
［レンズ諸元］
Ｒ Ｄ ｎｄ νｄ
[物面] ∞ ∞
[1] 97.6616 2.3331 1.83400 37.34
[2] 58.7534 5.7548 1.49700 81.61
[3] -2358.0771 0.1414
[4] 69.8636 4.8265 1.45650 90.27
[5] -10000.0000 可変
[6] -3451.7865 1.2726 1.64850 53.03
[7] 32.1162 0.1500
[8] 23.0874 3.6125 1.48749 70.44
[9] 129.4973 可変
[10] -39.0525 1.2019 1.77250 49.62
[11] 20.8350 1.4000
[12] 24.5125 2.5579 1.84666 23.78
[13] 138.5662 可変
[14]（絞り） 146.0836 2.6748 1.48749 70.44
[15] -66.0054 3.9202
[16] 62.4628 4.0379 1.48749 70.44
[17] -25.2550 1.3370
[18] -25.5666 1.2019 1.91082 35.25
[19] 25.9501 4.3813 1.51823 58.96
[20] -30.0359 0.1500
[21] 28.3562 3.7645 1.58267 46.42
[22] -57.1221 可変
[23] 88.5380 2.3880 1.84666 23.78
[24] -80.4005 1.0000 1.77250 49.62
[25] 21.8693 可変
[26] 34.8402 2.1613 1.72824 28.32
[27] 65.9094 2.0000
[28] -42.5021 1.0000 1.88300 40.80
[29] 178.4257 可変
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[像面] ∞
［全体諸元］
広角端 中望遠 望遠端
ｆ 71.23 139.77 291.09
Ｆｎｏ 5.10 5.71 6.62
２ω 17.3 8.7 4.2
像高 10.82 10.82 10.82
レンズ全長 134.00 161.43 179.00
Ｂｆ 0.95 0.95 0.95
[可変間隔]
広角端 中望遠 望遠端
d5 3.0100 30.4500 48.0200
d9 4.8500 13.8300 17.6100
d13 19.6400 11.9600 4.5000
d22 17.9400 13.5700 2.0000
d25 11.2100 11.2100 11.2100
d29 19.0000 22.0600 37.3100
[ズームレンズ群データ]
群 始面 焦点距離
1 1 105.26
2 6 -336.73
3 10 -37.84
4 14 29.83
5 23 -22.37
［条件式対応値］
実施例６
条件式（１） |(f4・ｆ5)/(fW・fT)| 0.032
条件式（２） f2/f3 8.90
条件式（３） β5T 3.13
条件式（４） Vn 53.03
Vp 70.44
[Lens specifications]
R D nd νd
[Object] ∞ ∞
[1] 97.6616 2.3331 1.83400 37.34
[2] 58.7534 5.7548 1.49700 81.61
[3] -2358.0771 0.1414
[4] 69.8636 4.8265 1.45650 90.27
[5] -10000.0000 variable
[6] -3451.7865 1.2726 1.64850 53.03
[7] 32.1162 0.1500
[8] 23.0874 3.6125 1.48749 70.44
[9] 129.4973 Variable
[10] -39.0525 1.2019 1.77250 49.62
[11] 20.8350 1.4000
[12] 24.5125 2.5579 1.84666 23.78
[13] 138.5662 Variable
[14] (Aperture) 146.0836 2.6748 1.48749 70.44
[15] -66.0054 3.9202
[16] 62.4628 4.0379 1.48749 70.44
[17] -25.2550 1.3370
[18] -25.5666 1.2019 1.91082 35.25
[19] 25.9501 4.3813 1.51823 58.96
[20] -30.0359 0.1500
[21] 28.3562 3.7645 1.58267 46.42
[22] -57.1221 Variable
[23] 88.5380 2.3880 1.84666 23.78
[24] -80.4005 1.0000 1.77250 49.62
[25] 21.8693 Variable
[26] 34.8402 2.1613 1.72824 28.32
[27] 65.9094 2.0000
[28] -42.5021 1.0000 1.88300 40.80
[29] 178.4257 Variable
[30] ∞ 4.1400 1.51680 64.20
[31] ∞ Bf
[Image plane] ∞
[Overall specifications]
Wide angle end Medium telephoto Telephoto end f 71.23 139.77 291.09
Fno 5.10 5.71 6.62
2ω 17.3 8.7 4.2
Image height 10.82 10.82 10.82
Total lens length 134.00 161.43 179.00
Bf 0.95 0.95 0.95
[Variable interval]
Wide angle end Medium telephoto Telephoto end
d5 3.0100 30.4500 48.0200
d9 4.8500 13.8300 17.6100
d13 19.6400 11.9600 4.5000
d22 17.9400 13.5700 2.0000
d25 11.2100 11.2100 11.2100
d29 19.0000 22.0600 37.3100
[Zoom lens group data]
Group Start surface Focal length
1 1 105.26
2 6 -336.73
3 10 -37.84
4 14 29.83
5 23 -22.37
[Conditional expression values]
Example 6
Conditional expression (1) | (f4 ・ f5) / (fW ・ fT) | 0.032
Conditional expression (2) f2 / f3 8.90
Conditional expression (3) β5T 3.13
Conditional expression (4) Vn 53.03
Vp 70.44
Ｌ１ 第１レンズ群
Ｌ２ 第２レンズ群
Ｌ３ 第３レンズ群
Ｌ４ 第４レンズ群
Ｌ５ 第５レンズ群
Ｌ５ａ 第５ａレンズ群
Ｌ５ｂ 第５ｂレンズ群
ＬＰＦ ローパスフィルタ
ＩＰ 像面
ｄ ｄ線
ｇ ｇ線
Ｃ Ｃ線
ΔＳ サジタル像面
ΔＭ メリジオナル像面
L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group L5 5th lens group L5a 5a lens group L5b 5b lens group LPF Low pass filter IP Image plane d d line g g line CC line ΔS Sagittal image plane ΔM Meridional image plane
Claims (4)
広角端から望遠端への変倍に際して、第１レンズ群と第２レンズ群との間隔が増大し、第３レンズ群と第４レンズ群との間隔が減少し、第４レンズ群と第５レンズ群との間隔が減少し、
第２レンズ群と第３レンズ群との間隔は広角端において最小となり、第５レンズ群は負の屈折力の第５ａレンズ群と負の屈折力の第５ｂレンズ群とからなり、無限遠合焦状態から近距離へのフォーカシングに際して第５ａレンズ群が物体側から像側へ光軸に沿って移動し、以下の条件を満足することを特徴とする望遠ズームレンズ。
（１）０．０２３＜｜（ｆ４・ｆ５）／（ｆＷ・ｆＴ)｜＜０．０４４
（２）２．５＜ｆ２／ｆ３＜１０．０
ただし、
ｆ２：第２レンズ群の焦点距離
ｆ３：第３レンズ群の焦点距離
ｆ４：第４レンズ群の焦点距離
ｆ５：第５レンズ群の無限遠合焦時の合成焦点距離
ｆＷ：広角端におけるレンズ全系の合成焦点距離
ｆＴ：望遠端におけるレンズ全系の合成焦点距離 In order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, a fourth lens group having a positive refractive power, and a negative and a fifth lens group having a refractive power,
Upon zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group increases, the distance between the third lens group and the fourth lens group decreases, and the fourth lens group and the fifth lens group decrease. The distance from the lens group decreases,
The distance between the second lens group and the third lens group is the smallest at the wide-angle end, and the fifth lens group is composed of the 5a lens group having a negative refractive power and the 5b lens group having a negative refractive power. A telephoto zoom lens characterized in that the 5a lens group moves along the optical axis from the object side to the image side during focusing from a focal state to a short distance, and satisfies the following conditions.
(1) 0.023 <| (f4 · f5) / (fW · fT) | <0.044
(2) 2.5 <f2 / f3 <10.0
However,
f2: Focal length of the second lens group f3: Focal length of the third lens group f4: Focal length of the fourth lens group f5: Synthetic focal length when the fifth lens group is focused at infinity fW: All lenses at the wide-angle end System composite focal length fT: total focal length of the lens system at the telephoto end
（３）２．７＜β５Ｔ＜３．７
ただし、
β５Ｔ：第５レンズ群の望遠端における結像倍率 The telephoto zoom lens according to claim 1, wherein the imaging magnification of the fifth lens group satisfies the following condition.
(3) 2.7 <β5T <3.7
However,
β5T: imaging magnification at the telephoto end of the fifth lens unit
（４）Ｖｎ＜Ｖｐ
ただし、
Ｖｎ：負レンズのアッベ数
Ｖｐ：正レンズのアッベ数 2. The second lens group is composed of a negative lens and a positive lens in order from the object side, and satisfies the following condition when the Abbe number of the negative lens is Vn and the Abbe number of the positive lens is Vp. The telephoto zoom lens according to any one of claims 3 to 3.
(4) Vn <Vp
However,
Vn: Abbe number of negative lens Vp: Abbe number of positive lens
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010232421A JP5554679B2 (en) | 2010-10-15 | 2010-10-15 | Telephoto zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010232421A JP5554679B2 (en) | 2010-10-15 | 2010-10-15 | Telephoto zoom lens |
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| Publication Number | Publication Date |
|---|---|
| JP2012088366A JP2012088366A (en) | 2012-05-10 |
| JP5554679B2 true JP5554679B2 (en) | 2014-07-23 |
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|---|---|---|---|
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| JP3387305B2 (en) * | 1996-02-23 | 2003-03-17 | ミノルタ株式会社 | Zoom lens with camera shake correction function |
| JP4227360B2 (en) * | 2002-05-15 | 2009-02-18 | キヤノン株式会社 | Zoom lens |
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