JP2019053122A - Variable power imaging optical system - Google Patents
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Abstract
Description
本発明は、デジタルカメラ、ビデオカメラ等の撮像装置に用いられる防振機能を有する変倍結像光学系に関する。 The present invention relates to a variable magnification imaging optical system having an image stabilization function used in an imaging apparatus such as a digital camera or a video camera.
従来、望遠端の半画角が５°以下である変倍結像光学系が特許文献１乃至３に開示されている。
Conventionally,
近年、デジタルスチルカメラ等の撮像装置に用いられる変倍結像光学系においては、ズーム全域で高い光学性能を有すること、小型軽量であることが要求されている。また、合焦した物体距離の前後におけるボケ量が大きくなることでボケを活かした画像表現の幅が広がること、露光時間の短縮により手ぶれや被写体ぶれを抑制しやすくなること等の理由により、Ｆナンバーが明るく大口径であることが要求されている。 In recent years, a variable magnification imaging optical system used in an imaging apparatus such as a digital still camera is required to have high optical performance in the entire zoom range and to be small and light. In addition, because the amount of blurring before and after the focused object distance is increased, the range of image expression utilizing blurring is widened, and it is easier to suppress camera shake and subject blurring by shortening the exposure time. The number is required to be bright and large.
また、特に望遠端の画角が狭い変倍結像光学系においては、手ぶれなどの振動の影響による撮影画像のぶれが発生しやすいため、光学系の一部のレンズ群（防振レンズ群）を光軸に対して垂直方向に変位させることにより撮影画像のぶれを補正する防振機能を有することが要求されている。さらに、変倍結像光学系において防振機能を有する場合には、防振レンズ群を駆動するためのアクチュエータの大型化を避けるため、防振レンズ群は径が小さく、重量が軽いことが要求されている。 In particular, in a variable magnification imaging optical system with a narrow angle of view at the telephoto end, it is easy for image blurring to occur due to the effects of vibration such as camera shake, so some lens groups (anti-vibration lens groups) of the optical system It is required to have a vibration isolating function for correcting blurring of a captured image by displacing the lens in a direction perpendicular to the optical axis. In addition, when the variable magnification imaging optical system has an anti-vibration function, the anti-vibration lens group is required to have a small diameter and light weight in order to avoid an increase in the size of the actuator for driving the anti-vibration lens group. Has been.
ところで、近年では、デジタルスチルカメラを用いた動画撮影が一般的になっている。動画撮影において、被写体に対する合焦状態を維持するために、フォーカスレンズ群を光軸方向に常に微小振動（ウォブリング）させ続けることによりコントラストの変化を常時検出してフォーカスレンズ群の移動方向を決定する方法が多く採用されている。ウォブリングによりフォーカスレンズ群を駆動する場合、フォーカスレンズ群の重量が大きいとフォーカスレンズ群を駆動するためのアクチュエータが大型化し、撮影レンズの小型化・軽量化が困難となってしまう。また、アクチュエータを大型化させずに重量の大きいフォーカスレンズ群を無理にウォブリング駆動させようとすると、アクチュエータから発生する雑音が大きくなり、この雑音が動画撮影において音声として記録されてしまうため問題となる。したがって、動画撮影に適応する変倍結像光学系はフォーカスレンズ群の軽量化が要求されている。 Incidentally, in recent years, moving image shooting using a digital still camera has become common. In moving image shooting, in order to maintain the in-focus state with respect to the subject, the focus lens group is constantly microvibrated (wobbling) in the optical axis direction to constantly detect a change in contrast and determine the moving direction of the focus lens group. Many methods are adopted. When the focus lens group is driven by wobbling, if the weight of the focus lens group is large, an actuator for driving the focus lens group becomes large, and it becomes difficult to reduce the size and weight of the photographing lens. In addition, if an attempt is made to forcibly drive a heavy focus lens group without increasing the size of the actuator, the noise generated from the actuator will increase, and this noise will be recorded as a sound during video shooting, which is a problem. . Therefore, a variable magnification imaging optical system adapted for moving image shooting is required to reduce the weight of the focus lens group.
特許文献１に開示された光学系は、広角端から望遠端までＦナンバーが２．８程度と大口径で、フォーカスレンズ群の軽量化も達成しているが、防振機能を有していない。
The optical system disclosed in
特許文献２に開示された光学系は、防振機能を有しているが、Ｆナンバーが広角端で４．５程度、望遠端で５．６程度と暗く、また、フォーカスレンズ群の軽量化が不十分という課題がある。
The optical system disclosed in
特許文献３に開示された光学系は、防振機能を有しているが、Ｆナンバーが広角端で５．０程度、望遠端で６．３程度と暗いという課題がある。
The optical system disclosed in
本発明はこのような課題に鑑みてなされたものであり、望遠端の半画角が５°程度以下と狭く、Ｆナンバーが２．８から４．０程度と明るく、ズーム全域で高い光学性能を有し、防振機能を有し、防振レンズ群及びフォーカスレンズ群の重量を抑制した変倍結像光学系を提供することを目的としている。 The present invention has been made in view of such problems. The half angle of view at the telephoto end is as narrow as about 5 ° or less, the F-number is as bright as about 2.8 to 4.0, and high optical performance over the entire zoom range. It is an object of the present invention to provide a variable magnification imaging optical system that has an anti-vibration function and suppresses the weight of the anti-vibration lens group and the focus lens group.
上記課題を解決するため、第１の発明は、物体側から像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、正の屈折力の第３レンズ群、正の屈折力の第４レンズ群、負の屈折力の第５レンズ群、正の屈折力の第６レンズ群からなり、変倍時に、隣り合うレンズ群の間隔が変化し、無限遠物体から近距離物体へのフォーカシングに際して、前記第４レンズ群が光軸に沿って物体側に移動し、以下に示す条件式を満足することを特徴とする変倍結像光学系とした。
（１）１．００＜ｆ３ｅｗ／Φｍ３ｗ＜１．７５
（２）１．２０＜ｆ３ｅｔ／Φｍ３ｔ＜３．５０
（３）０．５０＜ｍ３ｅｗ／ｍ３ｅｔ＜０．９０
ただし
ｆ３ｅｗ：広角端の第３レンズ群から最終レンズ群までの合成焦点距離
Φｍ３ｗ：広角端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値
ｆ３ｅｔ：望遠端の第３レンズ群から最終レンズ群までの合成焦点距離
Φｍ３ｔ：望遠端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値
ｍ３ｅｗ：広角端の第３レンズ群から最終レンズ群までの合成横倍率
ｍ３ｅｔ：望遠端の第３レンズ群から最終レンズ群までの合成横倍率
In order to solve the above-mentioned problem, the first invention is, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. , A fourth lens group having a positive refractive power, a fifth lens group having a negative refractive power, and a sixth lens group having a positive refractive power. In focusing from a short distance object to a short distance object, the fourth lens group moves toward the object side along the optical axis, and the variable magnification imaging optical system satisfies the following conditional expression.
(1) 1.00 <f3ew / Φm3w <1.75
(2) 1.20 <f3et / Φm3t <3.50
(3) 0.50 <m3ew / m3et <0.90
However, f3ew: Composite focal length Φm3w from the third lens group at the wide-angle end to the final lens group: Value obtained by multiplying the paraxial marginal ray height of the front surface of the third lens group at the wide-angle end by the entrance pupil diameter f3et: At the telephoto end Composite focal length Φm3t from the third lens group to the final lens group: a value obtained by multiplying the paraxial marginal ray height of the front surface of the third lens group at the telephoto end by the entrance pupil diameter m3ew: final from the third lens group at the wide angle end Combined lateral magnification up to the lens group m3et: Combined lateral magnification from the third lens group at the telephoto end to the final lens group
また、第２の発明は、前記第２レンズ群は、変倍時に像面に対し固定であり、物体側から像側へ順に、負の屈折力の第２ａレンズ群と負の屈折力の第２ｂレンズ群から構成され、前記第２ｂレンズ群を光軸に対して垂直方向に変位させることによって防振を行い、以下の条件式を満足することを特徴とする請求項１に記載の変倍結像光学系とした。
（４）０．０＜ｆ２ｂ／ｆ２ａ＜０．５
ただし
ｆ２ａ：第２ａレンズ群の焦点距離
ｆ２ｂ：第２ｂレンズ群の焦点距離
In the second invention, the second lens group is fixed with respect to the image plane at the time of zooming, and the second a lens group having a negative refractive power and a first lens having a negative refractive power are sequentially arranged from the object side to the image side. 2. The zoom lens according to
(4) 0.0 <f2b / f2a <0.5
However, f2a: Focal length of the 2a lens group f2b: Focal length of the 2b lens group
本発明によれば、望遠端の半画角が５°程度以下と狭く、Ｆナンバーが２．８から４．０程度と明るく、ズーム全域で高い光学性能を有し、防振機能を有し、防振レンズ群及びフォーカスレンズ群の重量を抑制した変倍結像光学系を提供することが可能となる。 According to the present invention, the half angle of view at the telephoto end is as narrow as about 5 ° or less, the F-number is as bright as about 2.8 to 4.0, has high optical performance over the entire zoom range, and has an anti-vibration function. It is possible to provide a variable magnification imaging optical system in which the weights of the image stabilizing lens group and the focus lens group are suppressed.
本発明に係る変倍結像光学系は、図１、図１１、図２１、図３１、図４１の各実施例のレンズ構成図に示されるとおり、物体側から像側へ順に、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、正の屈折力の第３レンズ群、正の屈折力の第４レンズ群、負の屈折力の第５レンズ群、正の屈折力の第６レンズ群からなり、変倍時に、隣り合うレンズ群の間隔が変化し、無限遠物体から近距離物体へのフォーカシングに際して、前記第４レンズ群が光軸に沿って物体側に移動する。 The variable magnification imaging optical system according to the present invention has positive refraction in order from the object side to the image side, as shown in the lens configuration diagrams of the respective examples in FIGS. 1, 11, 21, 31, and 41. First lens group having power, second lens group having negative refractive power, third lens group having positive refractive power, fourth lens group having positive refractive power, fifth lens group having negative refractive power, positive refraction 6th lens group of force, the distance between adjacent lens groups changes at the time of zooming, and the fourth lens group moves to the object side along the optical axis when focusing from an infinite object to a close object To do.
正の屈折力の第１レンズ群と負の屈折力の第２レンズ群は、広角端から望遠端への変倍時に、その間隔を増加させることにより変倍結像光学系の主な変倍効果を得ている。 The first lens group having a positive refractive power and the second lens group having a negative refractive power are main magnifications of the variable magnification imaging optical system by increasing the distance at the time of zooming from the wide angle end to the telephoto end. The effect is gained.
また、正の屈折力の第１レンズ群により光線が収斂されることにより第２レンズ群に入射する光線の光線高が低くなるため、防振レンズ群の軽量化のためには防振レンズ群を第２レンズ群に配置することが好ましい。 In addition, since the light ray is converged by the first lens unit having a positive refractive power and the height of the light ray incident on the second lens unit is lowered, the anti-vibration lens unit can be reduced in weight. Is preferably disposed in the second lens group.
正の屈折力の第３レンズ群と正の屈折力の第４レンズ群は、広角端から望遠端への変倍時に、それぞれ物体側に移動することで像面補償作用を担うとともに変倍効果の一部も担っている。 The third lens group having positive refractive power and the fourth lens group having positive refractive power move to the object side during zooming from the wide-angle end to the telephoto end, respectively, and provide an image plane compensation function and a zooming effect. Part of
正の屈折力の第３レンズ群は、負の屈折力の第２レンズ群で発散された光束を収斂し、後続のフォーカスレンズ群である正の屈折力の第４レンズ群へ収斂光を入射させることにより、球面収差のフォーカス時の変動を抑制することが可能となる。 The third lens group having a positive refractive power converges the light beam diverged by the second lens group having a negative refractive power, and the convergent light enters the fourth lens group having a positive refractive power, which is a subsequent focus lens group. By doing so, it becomes possible to suppress the fluctuation of the spherical aberration during focusing.
正の屈折力の第４レンズ群は、その物体側に配置された正の屈折力の第３レンズ群により収斂された光束が入射するので、これをフォーカスレンズ群とすることによりフォーカスレンズ群の軽量化が可能となる。 In the fourth lens group having a positive refractive power, a light beam converged by the third lens group having a positive refractive power disposed on the object side is incident. Weight reduction is possible.
負の屈折力の第５レンズ群は、ズーム全域で拡大系の倍率を持つことにより、その物体側に配置された正の合成系の焦点距離を増倍させる。これによりテレフォト系の構成とすることにより全長を縮小することが可能となる。 The fifth lens unit having a negative refractive power has a magnifying magnification in the entire zoom range, thereby multiplying the focal length of the positive combining system disposed on the object side. Thus, the total length can be reduced by adopting a telephoto system configuration.
正の屈折力の第６レンズ群は、像面に向かって光束が収斂される途中に配置されており、第５レンズ群との間隔を変化させることにより入射するＦナンバー光線の光線高を変化させて球面収差及び軸上色収差を変化させることが可能である。この性質を利用して、変倍時に第５レンズ群と第６レンズ群の間隔を適切に設定することによりズーム全域において球面収差及び軸上色収差を良好に補正することが可能となる。 The sixth lens group having a positive refractive power is disposed in the middle of the convergence of the light beam toward the image plane, and changes the height of the incident F-number light beam by changing the distance from the fifth lens group. It is possible to change the spherical aberration and the axial chromatic aberration. Using this property, it is possible to satisfactorily correct spherical aberration and axial chromatic aberration over the entire zoom range by appropriately setting the distance between the fifth lens group and the sixth lens group at the time of zooming.
また、本発明に係る変倍結像光学系は、以下に示す条件式を満足することを特徴とする。
（１）１．００＜ｆ３ｅｗ／Φｍ３ｗ＜１．７５
（２）１．２０＜ｆ３ｅｔ／Φｍ３ｔ＜３．５０
（３）０．５０＜ｍ３ｅｗ／ｍ３ｅｔ＜０．９０
ただし
ｆ３ｅｗ：広角端の第３レンズ群から最終レンズ群までの合成焦点距離
Φｍ３ｗ：広角端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値
ｆ３ｅｔ：望遠端の第３レンズ群から最終レンズ群までの合成焦点距離
Φｍ３ｔ：望遠端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値
ｍ３ｅｗ：広角端の第３レンズ群から最終レンズ群までの合成横倍率
ｍ３ｅｔ：望遠端の第３レンズ群から最終レンズ群までの合成横倍率
In addition, the variable magnification imaging optical system according to the present invention satisfies the following conditional expression.
(1) 1.00 <f3ew / Φm3w <1.75
(2) 1.20 <f3et / Φm3t <3.50
(3) 0.50 <m3ew / m3et <0.90
However, f3ew: Composite focal length Φm3w from the third lens group at the wide-angle end to the final lens group: Value obtained by multiplying the paraxial marginal ray height of the front surface of the third lens group at the wide-angle end by the entrance pupil diameter f3et: At the telephoto end Composite focal length Φm3t from the third lens group to the final lens group: a value obtained by multiplying the paraxial marginal ray height of the front surface of the third lens group at the telephoto end by the entrance pupil diameter m3ew: final from the third lens group at the wide angle end Combined lateral magnification up to the lens group m3et: Combined lateral magnification from the third lens group at the telephoto end to the final lens group
条件式（１）は、広角端での大口径Ｆナンバー２．８を確保し、広角端での光学性能を担保するため、広角端の第３レンズ群から最終レンズ群までの合成焦点距離と、広角端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値の比について好ましい範囲を規定するものである。 Conditional expression (1) secures a large aperture F number of 2.8 at the wide-angle end and guarantees the optical performance at the wide-angle end, and the combined focal length from the third lens group at the wide-angle end to the final lens group A preferred range is defined for the ratio of the values obtained by multiplying the paraxial marginal ray height of the front surface of the third lens group at the wide-angle end by the entrance pupil diameter.
条件式（１）の上限値を超えて、広角端の第３レンズ群から最終レンズ群までの合成系の正の屈折力が弱くなると、第３レンズ群から最終レンズ群までの共役間距離が長くなるため広角端の全長のコンパクト化が困難になる。また広角端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値が小さくなると、広角端の大口径化が困難になる。 When the upper limit of conditional expression (1) is exceeded and the positive refractive power of the composite system from the third lens group at the wide-angle end to the final lens group becomes weak, the interconjugate distance from the third lens group to the final lens group becomes smaller. Since it becomes longer, it becomes difficult to make the entire length of the wide-angle end compact. Also, if the value obtained by multiplying the height of the paraxial marginal ray on the leading surface of the third lens group at the wide-angle end by the entrance pupil diameter becomes small, it becomes difficult to increase the aperture at the wide-angle end.
一方、条件式（１）の下限値を超えて、広角端の第３レンズ群から最終レンズ群までの合成系の正の屈折力が強くなる、あるいは広角端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値が大きくなると、広角端での第３レンズ群から最終レンズ群までの見掛けのＦナンバーが小さくなるため広角端での球面収差、コマ収差の補正が困難になる。 On the other hand, exceeding the lower limit of conditional expression (1), the positive refractive power of the composite system from the third lens group at the wide-angle end to the final lens group becomes strong, or the front surface of the third lens group at the wide-angle end becomes stronger. When the value obtained by multiplying the paraxial marginal ray height by the entrance pupil diameter increases, the apparent F-number from the third lens group to the final lens group at the wide-angle end decreases, so that spherical aberration and coma aberration are corrected at the wide-angle end. Becomes difficult.
なお、条件式（１）について、望ましくはその下限値を１．２０に、または、上限値を１．５５に限定することで、前述の効果をより確実にすることができる。 Regarding conditional expression (1), the lower limit value is desirably limited to 1.20, or the upper limit value is preferably limited to 1.55, so that the above-described effect can be further ensured.
また、条件式（２）は、望遠端での大口径Ｆナンバー４.０を確保し、望遠端での光学性能を担保するため、望遠端の第３レンズ群から最終レンズ群までの合成焦点距離と、望遠端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値の比について好ましい範囲を規定するものである。 In addition, conditional expression (2) ensures a large aperture F number of 4.0 at the telephoto end and ensures the optical performance at the telephoto end, so that the combined focal point from the third lens group to the final lens group at the telephoto end. A preferable range is defined for the ratio of the distance and the value obtained by multiplying the height of the paraxial marginal ray on the front surface of the third lens group at the telephoto end by the entrance pupil diameter.
条件式（２）の上限値を超えて、望遠端の第３レンズ群から最終レンズ群までの合成系の正の屈折力が弱くなると、望遠端での第３レンズ群から最終レンズ群までの共役間距離が長くなるため望遠端の全長が長くなり、また第３レンズ以降の変倍による移動が大きくなることにより広角端から望遠端の全長の変化量が大きくなり、偏芯量の少ない信頼性の高いメカ構造を作ることが困難になる。また偏芯量の少ないメカ構造を構築しようとする場合、外径方向に構造物を設けることになり、全体をコンパクト化することが困難になる。また、望遠端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値が小さくなると、望遠端でのＦナンバーが大きくなり所望のＦナンバーを得ることが困難になる。 When the upper limit of conditional expression (2) is exceeded and the positive refractive power of the composite system from the third lens group at the telephoto end to the final lens group becomes weak, the distance from the third lens group at the telephoto end to the final lens group becomes smaller. The distance between conjugates becomes longer, so the total length of the telephoto end becomes longer, and the movement by zooming after the third lens increases, so that the amount of change in the total length from the wide-angle end to the telephoto end increases, and the amount of eccentricity is small. It becomes difficult to make a highly mechanical structure. When a mechanical structure with a small amount of eccentricity is to be constructed, a structure is provided in the outer diameter direction, making it difficult to make the whole compact. Further, when the value obtained by multiplying the paraxial marginal ray height of the front surface of the third lens unit at the telephoto end by the entrance pupil diameter becomes small, the F-number at the telephoto end becomes large and it becomes difficult to obtain a desired F-number. .
一方、条件式（２）の下限値を超えて、望遠端の第３レンズ群から最終レンズ群までの合成系の正の屈折力が強くなる、あるいは望遠端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値が大きくなると、望遠端での第３レンズ群から最終レンズ群までの見掛けのＦナンバーが小さくなるため望遠端での球面収差、コマ収差、非点収差の補正が困難になる。 On the other hand, exceeding the lower limit of conditional expression (2), the positive refractive power of the composite system from the third lens group at the telephoto end to the final lens group becomes strong, or the top surface of the third lens group at the telephoto end If the value obtained by multiplying the height of the paraxial marginal ray by the entrance pupil diameter increases, the apparent F number from the third lens group to the final lens group at the telephoto end decreases, so that spherical aberration, coma aberration, non- Correction of point aberration becomes difficult.
なお、条件式（２）について、望ましくはその下限値を１．４０に、または、上限値を２．７０に限定することで、前述の効果をより確実にすることができる。 Regarding conditional expression (2), the lower limit value is desirably limited to 1.40, or the upper limit value is preferably limited to 2.70, whereby the above-described effect can be further ensured.
また、条件式（３）は、第３レンズ群以降のズーム比分担、およびズーム時のＦナンバーの変化の抑制をするため、広角端の第３レンズ群から最終レンズ群までの合成横倍率と、望遠端の第３レンズ群から最終レンズ群までの合成横倍率の比について好ましい範囲を規定するものである。 Conditional expression (3) indicates that the combined lateral magnification from the third lens group at the wide-angle end to the final lens group in order to share the zoom ratio after the third lens group and to suppress the change of the F number during zooming. A preferable range is defined for the ratio of the combined lateral magnification from the third lens group at the telephoto end to the final lens group.
条件式（３）の上限値を超えて、ズーム時の第３レンズ群以降の変倍負担がほぼなくなると、所望のズーム比を得るには第２レンズ群での変倍を増やさざるを得ず、第２レンズ群での収差変動、特に歪曲収差の変動を補正することが困難になる。また、広角端の第３レンズ群から最終レンズ群までの合成横倍率が大きくなると、合成系の共役間距離が大きくなり、広角端の全長をコンパクト化できない。さらに全長をコンパクト化するには合成系の屈折力を強めなければならず、収差補正が困難になるため広角端での大口径化ができない。 When the upper limit of conditional expression (3) is exceeded and the zooming burden after the third lens group during zooming is almost eliminated, the zooming in the second lens group must be increased to obtain a desired zoom ratio. Accordingly, it becomes difficult to correct aberration fluctuations in the second lens group, particularly distortion aberration fluctuations. Further, if the combined lateral magnification from the third lens group at the wide-angle end to the final lens group increases, the interconjugate distance of the combined system increases, and the overall length of the wide-angle end cannot be reduced. Furthermore, in order to make the overall length compact, it is necessary to increase the refractive power of the synthesis system, and it becomes difficult to correct aberrations.
一方、条件式（３）の下限値を超えて、広角端の第３レンズ群から最終レンズ群までの合成横倍率が小さくなると、広角端でのバックフォーカスの確保が困難になる。さらに、この状態でバックフォーカスを確保しようとすると第３レンズ群以降の広角端の焦点距離を長くしなければならず、広角端の大口径化が困難になる。また望遠端の第３レンズ群から最終レンズ群までの合成横倍率が大きくなると、望遠端での第２レンズ群との間隔の確保が困難になり、無理に確保しようとした場合、第３レンズ群から最終レンズ群までの合成焦点距離を長くせざるを得ず、ズーム時の各群の移動量が大きくなり、メカ構造が複雑になる。 On the other hand, if the combined lateral magnification from the third lens group at the wide-angle end to the final lens group becomes smaller than the lower limit value of conditional expression (3), it becomes difficult to ensure the back focus at the wide-angle end. Further, in order to ensure the back focus in this state, it is necessary to increase the focal length at the wide-angle end after the third lens group, and it is difficult to increase the aperture at the wide-angle end. Also, if the combined lateral magnification from the third lens group at the telephoto end to the final lens group becomes large, it becomes difficult to secure the distance from the second lens group at the telephoto end. The combined focal length from the group to the final lens group must be increased, and the amount of movement of each group during zooming becomes large, resulting in a complicated mechanical structure.
なお、条件式（３）について、望ましくはその下限値を０．６０に、または、上限値を０．８０に限定することで、前述の効果をより確実にすることができる。 Regarding conditional expression (3), the lower limit value is desirably limited to 0.60, or the upper limit value is preferably limited to 0.80, whereby the above-described effect can be further ensured.
また、本発明に係る変倍結像光学系の第２レンズ群は、物体側から像側へ順に、負の屈折力の第２ａレンズ群と負の屈折力の第２ｂレンズ群からなり、第２ｂレンズ群を光軸に対して垂直方向に変位させることによって防振を行なう。正の屈折力の第１レンズ群と負の屈折力の第２ａレンズ群とにより望遠タイプを構成することにより第１レンズ群と第２ａレンズ群の合成系において全長を短縮することが可能となり、また入射する光線の光線高がより低くなる第２ｂレンズ群を防振レンズ群とすることで、防振レンズ群のより一層の軽量化が可能となる。これらより、第２レンズ群は、以下に示す条件式を満足することが望ましい。
（４）０．０＜ｆ２ｂ／ｆ２ａ＜０．５
ただし
ｆ２ａ：第２ａレンズ群の焦点距離
ｆ２ｂ：第２ｂレンズ群の焦点距離
The second lens group of the variable magnification imaging optical system according to the present invention includes, in order from the object side to the image side, a second a lens group having a negative refractive power and a second b lens group having a negative refractive power. Anti-vibration is performed by displacing the 2b lens group in a direction perpendicular to the optical axis. By configuring the telephoto type with the first lens unit having a positive refractive power and the second lens unit having a negative refractive power, it becomes possible to shorten the total length in the synthesis system of the first lens unit and the second lens unit, Further, by using the anti-vibration lens group as the second b lens group in which the height of the incident light beam is lower, the anti-vibration lens group can be further reduced in weight. Accordingly, it is desirable that the second lens group satisfies the following conditional expression.
(4) 0.0 <f2b / f2a <0.5
However, f2a: Focal length of the 2a lens group f2b: Focal length of the 2b lens group
条件式（４）は、第２ａレンズ群と第２ｂレンズ群の焦点距離の関係を規定する式であり、防振群である第２ｂレンズ群の軽量化および、望遠側での球面収差、コマ収差とズーム全域での非点収差を補正するための好ましい条件を示す。 Conditional expression (4) defines the relationship between the focal lengths of the 2a lens group and the 2b lens group. The conditional expression (4) reduces the weight of the 2b lens group, which is the image stabilizing group, and reduces spherical aberration and coma on the telephoto side. Preferable conditions for correcting aberration and astigmatism over the entire zoom range are shown.
条件式（４）の上限を超え、第２ａレンズ群の負の屈折力が相対的に強くなると、望遠側でのオーバーな球面収差の補正が困難になる。また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。また、メリジオナル像面についてもマイナスにシフトするため、後方のレンズ群で補正するためにはプラ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。さらに第２ａレンズ群の負の屈折力により光束の発散傾向が高まるため、防振群である第２ｂレンズ群に入射する光線高が高くなり、防振群の軽量化が困難になる。 If the upper limit of conditional expression (4) is exceeded and the negative refractive power of the 2a lens group becomes relatively strong, it becomes difficult to correct over spherical aberration on the telephoto side. Further, the coma flare of the lower ray on the telephoto side becomes under, which is not preferable. Also, since the meridional image plane shifts to minus, in order to correct with the rear lens group, a component of the meridional image plane in the plus direction must be generated forcibly, and astigmatism is corrected over the entire zoom range. It becomes difficult. Further, since the divergent tendency of the luminous flux is increased by the negative refractive power of the second lens group, the height of the light incident on the second lens group, which is the anti-vibration group, becomes high, making it difficult to reduce the weight of the anti-vibration group.
条件式（４）の下限を超え、第２ａレンズ群の負の屈折力が相対的に弱まると、望遠側でのアンダーな球面収差の補正が困難になる。また望遠側の下光線のコマフレアおよび、オーバーなメリジオナル非点収差の補正が困難になる。 If the lower limit of conditional expression (4) is exceeded and the negative refractive power of the 2a lens group becomes relatively weak, it becomes difficult to correct the under spherical aberration on the telephoto side. Further, it becomes difficult to correct coma flares of the lower rays on the telephoto side and excessive meridional astigmatism.
なお、条件式（４）について、望ましくはその下限値を０．０３に、または、上限値を０．４０に限定することで、前述の効果をより確実にすることができる。 Regarding conditional expression (4), the lower limit value is desirably limited to 0.03 or the upper limit value is desirably limited to 0.40, whereby the above-described effect can be further ensured.
さらに本発明に係る変倍結像光学系は、第４レンズ群は、１枚の正レンズから構成されることが望ましい。 Furthermore, in the variable magnification imaging optical system according to the present invention, it is desirable that the fourth lens group is composed of one positive lens.
フォーカスレンズ群である第４レンズ群を１枚の正レンズから構成することにより、フォーカスレンズ群をより軽量化することが可能となり、動画撮影におけるフォーカスレンズ群のウォブリング駆動にも好適な変倍結像光学系の提供が可能となる。 By constructing the fourth lens group, which is the focus lens group, from a single positive lens, it becomes possible to reduce the weight of the focus lens group, and it is also suitable for wobbling driving of the focus lens group in moving image shooting. An image optical system can be provided.
次に、本発明に係る変倍結像光学系の各実施例のレンズ構成について説明する。以下の説明において、レンズ構成を物体側から像側の順番で記載する。Ｌｎは物体側から順番にレンズを数えたときのレンズ番号ｎに対応するレンズを示す記号であり、接合レンズの場合にはこれを構成するそれぞれのレンズ１枚ごとに記号を示すこととする。 Next, the lens configuration of each example of the variable magnification imaging optical system according to 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. Ln is a symbol indicating a lens corresponding to the lens number n when the lenses are counted in order from the object side. In the case of a cemented lens, the symbol is indicated for each lens constituting the lens.
図１は、本発明の実施例１の結像光学系のレンズ構成図である。 FIG. 1 is a lens configuration diagram of an imaging optical system according to Example 1 of the present invention.
物体側より順に、正の屈折力の第１レンズ群Ｇ１、負の屈折力の第２レンズ群Ｇ２、正の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、負の屈折力の第５レンズ群Ｇ５、正の屈折力の第６レンズ群Ｇ６から構成され、広角端から望遠端への変倍に際して、第１レンズ群Ｇ１は物体側に移動し、第２レンズ群Ｇ２は固定され、第３レンズ群Ｇ３は物体側に移動し、第４レンズ群Ｇ４は物体側に移動し、第５レンズ群Ｇ５は物体側に移動し、第６レンズ群Ｇ６は移動する構成となっている。また、無限遠物体から近距離物体へのフォーカシングに際して、第４レンズ群Ｇ４が光軸に沿って物体側に移動する。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, the fourth lens group G4 having a positive refractive power, and a negative And a sixth lens group G6 having a positive refractive power. Upon zooming from the wide-angle end to the telephoto end, the first lens group G1 moves toward the object side, and the second lens The group G2 is fixed, the third lens group G3 moves to the object side, the fourth lens group G4 moves to the object side, the fifth lens group G5 moves to the object side, and the sixth lens group G6 moves. It has a configuration. In focusing from an infinitely distant object to a close object, the fourth lens group G4 moves toward the object side along the optical axis.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と両凸レンズＬ２からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ３から構成される。 The first lens group G1 includes a cemented lens including a negative meniscus lens L1 having a convex surface facing the object side and a biconvex lens L2, and a positive meniscus lens L3 having a convex surface facing the object side.
第２レンズ群Ｇ２は、物体側より順に負の屈折力の第２ａレンズ群Ｇ２ａと負の屈折力の第２ｂレンズ群Ｇ２ｂから構成され、第２ｂレンズ群Ｇ２ｂを光軸に対して垂直方向に変位させることによって防振を行う。第２ａレンズ群Ｇ２ａは、両凸レンズＬ４と、両凸レンズＬ５と両凹レンズＬ６からなる接合レンズから構成される。第２ｂレンズ群Ｇ２ｂは、両凹レンズＬ７と、両凹レンズＬ８と両凸レンズＬ９からなる接合レンズから構成される。 The second lens group G2 includes a second-a lens group G2a having a negative refractive power and a second-b lens group G2b having a negative refractive power in order from the object side. The second-b lens group G2b is arranged in a direction perpendicular to the optical axis. Anti-vibration is performed by displacing. The second-a lens group G2a includes a biconvex lens L4 and a cemented lens including a biconvex lens L5 and a biconcave lens L6. The 2b lens group G2b includes a biconcave lens L7 and a cemented lens including a biconcave lens L8 and a biconvex lens L9.
開口絞りは第３レンズ群Ｇ３の物体側に備えられ、変倍に伴って第３レンズ群Ｇ３と一体で移動する。 The aperture stop is provided on the object side of the third lens group G3, and moves together with the third lens group G3 with zooming.
第３レンズ群Ｇ３は、両凸レンズＬ１０と、物体側に凸面を向けた正メニスカスレンズＬ１１と、両凸レンズＬ１２と両凹レンズＬ１３からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１４と、物体側に凸面を向けた負メニスカスレンズＬ１５と、物体側に凸面を向けた負メニスカスレンズＬ１６と両凸レンズＬ１７からなる接合レンズから構成される。 The third lens group G3 includes a biconvex lens L10, a positive meniscus lens L11 having a convex surface facing the object side, a cemented lens including a biconvex lens L12 and a biconcave lens L13, and a positive meniscus lens L14 having a convex surface facing the object side. , A negative meniscus lens L15 having a convex surface facing the object side, and a cemented lens including a negative meniscus lens L16 having a convex surface facing the object side and a biconvex lens L17.
第４レンズ群Ｇ４は、物体側に凸面を向けた正メニスカスレンズＬ１８から構成される。 The fourth lens group G4 includes a positive meniscus lens L18 having a convex surface directed toward the object side.
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Ｌ１９から構成される。 The fifth lens group G5 includes a negative meniscus lens L19 having a convex surface directed toward the object side.
第６レンズ群Ｇ６は、物体側に凹面を向けた負メニスカスレンズＬ２０と物体側に凹面を向けた正メニスカスレンズＬ２１からなる接合レンズから構成される。 The sixth lens group G6 includes a cemented lens including a negative meniscus lens L20 having a concave surface directed toward the object side and a positive meniscus lens L21 having a concave surface directed toward the object side.
図１１は、本発明の実施例２の結像光学系のレンズ構成図である。 FIG. 11 is a lens configuration diagram of the imaging optical system according to Example 2 of the present invention.
物体側より順に、正の屈折力の第１レンズ群Ｇ１、負の屈折力の第２レンズ群Ｇ２、正の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、負の屈折力の第５レンズ群Ｇ５、正の屈折力の第６レンズ群Ｇ６から構成され、広角端から望遠端への変倍に際して、第１レンズ群Ｇ１は物体側に移動し、第２レンズ群Ｇ２は固定され、第３レンズ群Ｇ３は物体側に移動し、第４レンズ群Ｇ４は物体側に移動し、第５レンズ群Ｇ５は物体側に移動し、第６レンズ群Ｇ６は物体側に移動する構成となっている。また、無限遠物体から近距離物体へのフォーカシングに際して、第４レンズ群Ｇ４が光軸に沿って物体側に移動する。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, the fourth lens group G4 having a positive refractive power, and a negative And a sixth lens group G6 having a positive refractive power. Upon zooming from the wide-angle end to the telephoto end, the first lens group G1 moves toward the object side, and the second lens The group G2 is fixed, the third lens group G3 moves to the object side, the fourth lens group G4 moves to the object side, the fifth lens group G5 moves to the object side, and the sixth lens group G6 moves to the object side. It is configured to move to. In focusing from an infinitely distant object to a close object, the fourth lens group G4 moves toward the object side along the optical axis.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と両凸レンズＬ２からなる接合レンズと、物体側に凸面を向けた正メニスカスＬ３から構成される。 The first lens group G1 includes a cemented lens including a negative meniscus lens L1 having a convex surface facing the object side and a biconvex lens L2, and a positive meniscus L3 having a convex surface facing the object side.
第２レンズ群Ｇ２は、物体側より順に負の屈折力の第２ａレンズ群Ｇ２ａと負の屈折力の第２ｂレンズ群Ｇ２ｂから構成され、第２ｂレンズ群Ｇ２ｂを光軸に対して垂直方向に変位させることによって防振を行う。第２ａレンズ群Ｇ２ａは、物体側に凸面を向けた負メニスカスレンズＬ４から構成される。第２ｂレンズ群Ｇ２ｂは、物体側に凹面を向けた正メニスカスレンズＬ５と両凹レンズＬ６からなる接合レンズと、両凹レンズＬ７から構成される。 The second lens group G2 includes a second-a lens group G2a having a negative refractive power and a second-b lens group G2b having a negative refractive power in order from the object side. The second-b lens group G2b is arranged in a direction perpendicular to the optical axis. Anti-vibration is performed by displacing. The second-a lens group G2a is composed of a negative meniscus lens L4 having a convex surface directed toward the object side. The second lens group G2b is composed of a cemented lens including a positive meniscus lens L5 having a concave surface directed toward the object side and a biconcave lens L6, and a biconcave lens L7.
開口絞りは第３レンズ群Ｇ３の物体側に備えられ、変倍に伴って第３レンズ群Ｇ３と一体で移動する。 The aperture stop is provided on the object side of the third lens group G3, and moves together with the third lens group G3 with zooming.
第３レンズ群Ｇ３は、両凸レンズＬ８と、両凸レンズＬ９と、両凸レンズＬ１０と両凹レンズＬ１１からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１２と、物体側に凸面を向けた負メニスカスレンズＬ１３と、物体側に凸面を向けた負メニスカスレンズＬ１４と両凸レンズＬ１５からなる接合レンズから構成される。 The third lens group G3 has a biconvex lens L8, a biconvex lens L9, a cemented lens composed of a biconvex lens L10 and a biconcave lens L11, a positive meniscus lens L12 having a convex surface on the object side, and a convex surface on the object side. The lens includes a negative meniscus lens L13, a cemented lens including a negative meniscus lens L14 having a convex surface facing the object side, and a biconvex lens L15.
第４レンズ群Ｇ４は、物体側に凸面を向けた正メニスカスレンズＬ１６から構成される。 The fourth lens group G4 includes a positive meniscus lens L16 having a convex surface directed toward the object side.
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Ｌ１７から構成される。 The fifth lens group G5 includes a negative meniscus lens L17 having a convex surface directed toward the object side.
第６レンズ群Ｇ６は、物体側に凹面を向けた負メニスカスレンズＬ１８と物体側に凹面を向けた正メニスカスレンズＬ１９からなる接合レンズから構成される。 The sixth lens group G6 includes a cemented lens including a negative meniscus lens L18 having a concave surface directed toward the object side and a positive meniscus lens L19 having a concave surface directed toward the object side.
図２１は、本発明の実施例３の結像光学系のレンズ構成図である。 FIG. 21 is a lens configuration diagram of the imaging optical system according to Example 3 of the present invention.
物体側より順に、正の屈折力の第１レンズ群Ｇ１、負の屈折力の第２レンズ群Ｇ２、正の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、負の屈折力の第５レンズ群Ｇ５、正の屈折力の第６レンズ群Ｇ６から構成され、広角端から望遠端への変倍に際して、第１レンズ群Ｇ１は物体側に移動し、第２レンズ群Ｇ２は固定され、第３レンズ群Ｇ３は物体側に移動し、第４レンズ群Ｇ４は物体側に移動し、第５レンズ群Ｇ５は物体側に移動し、第６レンズ群Ｇ６は移動する構成となっている。また、無限遠物体から近距離物体へのフォーカシングに際して、第４レンズ群Ｇ４が光軸に沿って物体側に移動する。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, the fourth lens group G4 having a positive refractive power, and a negative And a sixth lens group G6 having a positive refractive power. Upon zooming from the wide-angle end to the telephoto end, the first lens group G1 moves toward the object side, and the second lens The group G2 is fixed, the third lens group G3 moves to the object side, the fourth lens group G4 moves to the object side, the fifth lens group G5 moves to the object side, and the sixth lens group G6 moves. It has a configuration. In focusing from an infinitely distant object to a close object, the fourth lens group G4 moves toward the object side along the optical axis.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と両凸レンズＬ２からなる接合レンズと、両凸レンズＬ３から構成される。 The first lens group G1 includes a cemented lens including a negative meniscus lens L1 having a convex surface directed toward the object side and a biconvex lens L2, and a biconvex lens L3.
第２レンズ群Ｇ２は、物体側より順に負の屈折力の第２ａレンズ群Ｇ２ａと負の屈折力の第２ｂレンズ群Ｇ２ｂから構成され、第２ｂレンズ群Ｇ２ｂを光軸に対して垂直方向に変位させることによって防振を行う。第２ａレンズ群Ｇ２ａは、物体側に凸面を向けた正メニスカスレンズＬ４と、物体側に凹面を向けた正メニスカスレンズＬ５と両凹レンズＬ６からなる接合レンズから構成される。第２ｂレンズ群Ｇ２ｂは、物体側に凹面を向けた正メニスカスレンズＬ７と両凹レンズＬ８からなる接合レンズと、物体側に凹面を向けた負メニスカスレンズＬ９から構成される。 The second lens group G2 includes a second-a lens group G2a having a negative refractive power and a second-b lens group G2b having a negative refractive power in order from the object side. The second-b lens group G2b is arranged in a direction perpendicular to the optical axis. Anti-vibration is performed by displacing. The second-a lens group G2a includes a cemented lens including a positive meniscus lens L4 having a convex surface directed toward the object side, a positive meniscus lens L5 having a concave surface directed toward the object side, and a biconcave lens L6. The second b lens group G2b includes a cemented lens including a positive meniscus lens L7 having a concave surface facing the object side and a biconcave lens L8, and a negative meniscus lens L9 having a concave surface facing the object side.
開口絞りは第３レンズ群Ｇ３の物体側に備えられ、変倍に伴って第３レンズ群Ｇ３と一体で移動する。 The aperture stop is provided on the object side of the third lens group G3, and moves together with the third lens group G3 with zooming.
第３レンズ群Ｇ３は、両凸レンズＬ１０と、両凸レンズＬ１１と、両凸レンズＬ１２と両凹レンズＬ１３からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１４と、物体側に凸面を向けた負メニスカスレンズＬ１５から構成される。 The third lens group G3 has a biconvex lens L10, a biconvex lens L11, a cemented lens composed of a biconvex lens L12 and a biconcave lens L13, a positive meniscus lens L14 having a convex surface on the object side, and a convex surface on the object side. It comprises a negative meniscus lens L15.
第４レンズ群Ｇ４は、両凸レンズＬ１６と物体側に凹面を向けた負メニスカスレンズＬ１７からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１８から構成される。 The fourth lens group G4 includes a cemented lens including a biconvex lens L16, a negative meniscus lens L17 having a concave surface directed toward the object side, and a positive meniscus lens L18 having a convex surface directed toward the object side.
第５レンズ群Ｇ５は、両凹レンズＬ１９から構成される。 The fifth lens group G5 includes a biconcave lens L19.
第６レンズ群Ｇ６は、物体側に凸面を向けた正メニスカスレンズＬ２０から構成される。 The sixth lens group G6 includes a positive meniscus lens L20 having a convex surface directed toward the object side.
図３１は、本発明の実施例４の結像光学系のレンズ構成図である。 FIG. 31 is a lens configuration diagram of the imaging optical system according to Example 4 of the present invention.
物体側より順に、正の屈折力の第１レンズ群Ｇ１、負の屈折力の第２レンズ群Ｇ２、正の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、負の屈折力の第５レンズ群Ｇ５、正の屈折力の第６レンズ群Ｇ６から構成され、広角端から望遠端への変倍に際して、第１レンズ群Ｇ１は物体側に移動し、第２レンズ群Ｇ２は固定され、第３レンズ群Ｇ３は物体側に移動し、第４レンズ群Ｇ４は物体側に移動し、第５レンズ群Ｇ５は物体側に移動し、第６レンズ群Ｇ６は物体側に移動する構成となっている。また、無限遠物体から近距離物体へのフォーカシングに際して、第４レンズ群Ｇ４が光軸に沿って物体側に移動する。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, the fourth lens group G4 having a positive refractive power, and a negative And a sixth lens group G6 having a positive refractive power. Upon zooming from the wide-angle end to the telephoto end, the first lens group G1 moves toward the object side, and the second lens The group G2 is fixed, the third lens group G3 moves to the object side, the fourth lens group G4 moves to the object side, the fifth lens group G5 moves to the object side, and the sixth lens group G6 moves to the object side. It is configured to move to. In focusing from an infinitely distant object to a close object, the fourth lens group G4 moves toward the object side along the optical axis.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と両凸レンズＬ２からなる接合レンズと、両凸レンズＬ３から構成される。 The first lens group G1 includes a cemented lens including a negative meniscus lens L1 having a convex surface directed toward the object side and a biconvex lens L2, and a biconvex lens L3.
第２レンズ群Ｇ２は、物体側より順に負の屈折力の第２ａレンズ群Ｇ２ａと負の屈折力の第２ｂレンズ群Ｇ２ｂから構成され、第２ｂレンズ群Ｇ２ｂを光軸に対して垂直方向に変位させることによって防振を行う。第２ａレンズ群Ｇ２ａは、物体側に凸面を向けた正メニスカスレンズレンズＬ４と物体側に凸面を向けた負メニスカスレンズレンズＬ５からなる接合レンズから構成される。第２ｂレンズ群Ｇ２ｂは、両凹レンズＬ６と、両凹レンズＬ７と両凸レンズＬ８からなる接合レンズから構成される。 The second lens group G2 includes a second-a lens group G2a having a negative refractive power and a second-b lens group G2b having a negative refractive power in order from the object side. The second-b lens group G2b is arranged in a direction perpendicular to the optical axis. Anti-vibration is performed by displacing. The second-a lens group G2a includes a cemented lens including a positive meniscus lens lens L4 having a convex surface facing the object side and a negative meniscus lens lens L5 having a convex surface facing the object side. The second b lens group G2b includes a biconcave lens L6 and a cemented lens including a biconcave lens L7 and a biconvex lens L8.
開口絞りは第３レンズ群Ｇ３の物体側に備えられ、変倍に伴って第３レンズ群Ｇ３と一体で移動する。 The aperture stop is provided on the object side of the third lens group G3, and moves together with the third lens group G3 with zooming.
第３レンズ群Ｇ３は、両凸レンズＬ９と、両凸レンズＬ１０と、両凸レンズＬ１１と両凹レンズＬ１２からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１３と、物体側に凸面を向けた負メニスカスレンズＬ１４とから構成される。 The third lens group G3 has a biconvex lens L9, a biconvex lens L10, a cemented lens composed of a biconvex lens L11 and a biconcave lens L12, a positive meniscus lens L13 having a convex surface on the object side, and a convex surface on the object side. It comprises a negative meniscus lens L14.
第４レンズ群Ｇ４は、物体側に凸面を向けた負メニスカスレンズＬ１５と両凸レンズＬ１６からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１７から構成される。 The fourth lens group G4 includes a cemented lens including a negative meniscus lens L15 having a convex surface directed toward the object side and a biconvex lens L16, and a positive meniscus lens L17 having a convex surface directed toward the object side.
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Ｌ１８から構成される。 The fifth lens group G5 includes a negative meniscus lens L18 having a convex surface directed toward the object side.
第６レンズ群Ｇ６は、両凹レンズＬ１９と両凸レンズＬ２０からなる接合レンズから構成される。 The sixth lens group G6 includes a cemented lens including a biconcave lens L19 and a biconvex lens L20.
図４１は、本発明の実施例５の結像光学系のレンズ構成図である。 FIG. 41 is a lens configuration diagram of the imaging optical system according to Example 5 of the present invention.
物体側より順に、正の屈折力の第１レンズ群Ｇ１、負の屈折力の第２レンズ群Ｇ２、正の屈折力の第３レンズ群Ｇ３、正の屈折力の第４レンズ群Ｇ４、負の屈折力の第５レンズ群Ｇ５、正の屈折力の第６レンズ群Ｇ６から構成され、広角端から望遠端への変倍に際して、第１レンズ群Ｇ１は物体側に移動し、第２レンズ群Ｇ２は固定され、第３レンズ群Ｇ３は物体側に移動し、第４レンズ群Ｇ４は物体側に移動し、第５レンズ群Ｇ５は物体側に移動し、第６レンズ群Ｇ６は物体側に移動する構成となっている。また、無限遠物体から近距離物体へのフォーカシングに際して、第４レンズ群Ｇ４が光軸に沿って物体側に移動する。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, the fourth lens group G4 having a positive refractive power, and a negative And a sixth lens group G6 having a positive refractive power. Upon zooming from the wide-angle end to the telephoto end, the first lens group G1 moves toward the object side, and the second lens The group G2 is fixed, the third lens group G3 moves to the object side, the fourth lens group G4 moves to the object side, the fifth lens group G5 moves to the object side, and the sixth lens group G6 moves to the object side. It is configured to move to. In focusing from an infinitely distant object to a close object, the fourth lens group G4 moves toward the object side along the optical axis.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズＬ１と両凸レンズＬ２からなる接合レンズと、両凸レンズＬ３から構成される。 The first lens group G1 includes a cemented lens including a negative meniscus lens L1 having a convex surface directed toward the object side and a biconvex lens L2, and a biconvex lens L3.
第２レンズ群Ｇ２は、物体側より順に負の屈折力の第２ａレンズ群Ｇ２ａと負の屈折力の第２ｂレンズ群Ｇ２ｂから構成され、第２ｂレンズ群Ｇ２ｂを光軸に対して垂直方向に変位させることによって防振を行う。第２ａレンズ群Ｇ２ａは、両凸レンズＬ４と、両凹レンズＬ５から構成される。第２ｂレンズ群Ｇ２ｂは、物体側に両凹レンズＬ６と、両凹レンズＬ７と両凸レンズＬ８からなる接合レンズとから構成される。 The second lens group G2 includes a second-a lens group G2a having a negative refractive power and a second-b lens group G2b having a negative refractive power in order from the object side. The second-b lens group G2b is arranged in a direction perpendicular to the optical axis. Anti-vibration is performed by displacing. The second-a lens group G2a includes a biconvex lens L4 and a biconcave lens L5. The second b lens group G2b includes a biconcave lens L6 on the object side, and a cemented lens including a biconcave lens L7 and a biconvex lens L8.
開口絞りは第３レンズ群Ｇ３の物体側に備えられ、変倍に伴って第３レンズ群Ｇ３と一体で移動する。 The aperture stop is provided on the object side of the third lens group G3, and moves together with the third lens group G3 with zooming.
第３レンズ群Ｇ３は、両凸レンズＬ９と、両凸レンズＬ１０と、両凸レンズＬ１１と両凹レンズＬ１２からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１３と、物体側に凸面を向けた負メニスカスレンズＬ１４とから構成される。 The third lens group G3 has a biconvex lens L9, a biconvex lens L10, a cemented lens composed of a biconvex lens L11 and a biconcave lens L12, a positive meniscus lens L13 having a convex surface on the object side, and a convex surface on the object side. It comprises a negative meniscus lens L14.
第４レンズ群Ｇ４は、物体側に凸面を向けた負メニスカスレンズＬ１５と両凸レンズＬ１６からなる接合レンズと、物体側に凸面を向けた正メニスカスレンズＬ１７から構成される。 The fourth lens group G4 includes a cemented lens including a negative meniscus lens L15 having a convex surface directed toward the object side and a biconvex lens L16, and a positive meniscus lens L17 having a convex surface directed toward the object side.
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Ｌ１８から構成される。 The fifth lens group G5 includes a negative meniscus lens L18 having a convex surface directed toward the object side.
第６レンズ群Ｇ６は、両凹レンズＬ１９と両凸レンズＬ２０からなる接合レンズから構成される。 The sixth lens group G6 includes a cemented lens including a biconcave lens L19 and a biconvex lens L20.
次に、本発明に係る変倍結像光学系の各実施例の数値実施例と条件式対応値について説明する。 Next, numerical examples and values corresponding to conditional expressions of each embodiment of the variable magnification imaging optical system according to the present invention will be described.
［面データ］において、面番号は物体側から順番に数えたレンズ面または開口絞りの番号、ｒはレンズ面の曲率半径、ｄはレンズ面の間隔、ｎｄはｄ線（波長５８７．５６ｎｍ）に対する屈折率、νｄはｄ線（波長５８７．５６ｎｍ）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 in order from the object side, r is the radius of curvature of the lens surface, d is the distance between the lens surfaces, and nd is for the d-line (wavelength 587.56 nm). The refractive index, νd, indicates the Abbe number with respect to the d-line (wavelength: 587.56 nm).
［各種データ］において、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。 In [various data], values such as the zoom ratio and the focal length in each focal length state are shown.
［可変間隔データ］において、各焦点距離状態における可変間隔及びＢＦの値を示している。 In [Variable interval data], the variable interval and the value of BF in each focal length state are shown.
［レンズ群データ］において、各レンズ群を構成する最も物体側のレンズ面の面番号及びレンズ群全体の焦点距離を示している。 In [Lens Group Data], the surface number of the most object side lens surface constituting each lens group and the focal length of the entire lens group are shown.
各実施例に対応する各収差図において、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 each aberration diagram 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.
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 even in proportional expansion and proportional reduction, and the present invention is not limited to this.
数値実施例1
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ ∞
1 169.2923 1.5000 1.83481 42.72
2 74.3462 8.9842 1.49700 81.61
3 -319.6781 0.1500
4 73.9509 7.3340 1.49700 81.61
5 31329.9471 (d5)
6 53.9312 4.0584 1.75520 27.53
7 -518.7023 0.6000
8 258.8455 3.8033 1.77250 49.62
9 -49.2685 0.7500 1.85026 32.27
10 40.4007 7.0892
11 -75.0181 0.7500 1.77250 49.62
12 41.0733 2.6996
13 -32.2083 0.7500 1.77250 49.62
14 41.3033 3.2762 1.92119 23.96
15 -99.1264 (d15)
16(絞り) ∞ 1.0000
17 66.5255 3.3250 1.83500 42.98
18 -112.3825 0.1500
19 48.6580 2.8764 1.49700 81.61
20 381.1337 0.2000
21 32.4725 5.3127 1.49700 81.61
22 -42.6503 0.7500 1.90366 31.31
23 52.9551 0.1500
24 19.5167 4.8876 1.80518 25.46
25 491.0518 1.8554
26 197.3673 0.7500 1.92119 23.96
27 16.9014 4.8215
28 144.5923 0.7500 1.90366 31.31
29 16.8165 4.9809 1.54072 47.20
30 -33.8075 (d30)
31 22.7838 3.4429 1.83500 42.98
32 137.5816 (d32)
33 111.1313 0.7500 1.91082 35.25
34 21.0895 (d34)
35 -47.7835 0.7500 1.49700 81.61
36 -513.8725 3.2615 1.92119 23.96
37 -38.2009 (d37)
38 ∞ 4.2000 1.51680 64.20
39 ∞ (BF)
[各種データ]
ズーム比 3.90
広角 中間 望遠
焦点距離 50.00 97.65 195.00
Fナンバー 2.91 3.15 4.02
全画角2ω 23.93 12.28 6.22
像高Y 10.82 10.82 10.82
レンズ全長 150.00 178.82 195.00
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d5 2.0000 30.8102 46.9899
d15 22.6238 13.9371 2.4811
d30 4.1500 10.6087 13.1857
d32 3.7152 3.2224 1.5000
d34 8.8116 9.5305 21.5779
d37 0.1500 2.1574 0.7163
BF 22.5906 22.5906 22.5903
[レンズ群データ]
群 始面 焦点距離
G1 1 116.14
G2 6 -25.20
G3 16 36.47
G4 31 32.26
G5 33 -28.69
G6 35 74.24
G2a 6 -420.22
G2b 11 -24.94
Numerical example 1
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ ∞
1 169.2923 1.5000 1.83481 42.72
2 74.3462 8.9842 1.49700 81.61
3 -319.6781 0.1500
4 73.9509 7.3340 1.49700 81.61
5 31329.9471 (d5)
6 53.9312 4.0584 1.75520 27.53
7 -518.7023 0.6000
8 258.8455 3.8033 1.77250 49.62
9 -49.2685 0.7500 1.85026 32.27
10 40.4007 7.0892
11 -75.0181 0.7500 1.77250 49.62
12 41.0733 2.6996
13 -32.2083 0.7500 1.77250 49.62
14 41.3033 3.2762 1.92119 23.96
15 -99.1264 (d15)
16 (Aperture) ∞ 1.0000
17 66.5255 3.3250 1.83500 42.98
18 -112.3825 0.1500
19 48.6580 2.8764 1.49700 81.61
20 381.1337 0.2000
21 32.4725 5.3127 1.49700 81.61
22 -42.6503 0.7500 1.90366 31.31
23 52.9551 0.1500
24 19.5167 4.8876 1.80518 25.46
25 491.0518 1.8554
26 197.3673 0.7500 1.92119 23.96
27 16.9014 4.8215
28 144.5923 0.7500 1.90366 31.31
29 16.8165 4.9809 1.54072 47.20
30 -33.8075 (d30)
31 22.7838 3.4429 1.83500 42.98
32 137.5816 (d32)
33 111.1313 0.7500 1.91082 35.25
34 21.0895 (d34)
35 -47.7835 0.7500 1.49700 81.61
36 -513.8725 3.2615 1.92119 23.96
37 -38.2009 (d37)
38 ∞ 4.2000 1.51680 64.20
39 ∞ (BF)
[Various data]
Zoom ratio 3.90
Wide angle Medium telephoto Focal length 50.00 97.65 195.00
F number 2.91 3.15 4.02
Full angle 2ω 23.93 12.28 6.22
Image height Y 10.82 10.82 10.82
Total lens length 150.00 178.82 195.00
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d5 2.0000 30.8102 46.9899
d15 22.6238 13.9371 2.4811
d30 4.1500 10.6087 13.1857
d32 3.7152 3.2224 1.5000
d34 8.8116 9.5305 21.5779
d37 0.1500 2.1574 0.7163
BF 22.5906 22.5906 22.5903
[Lens group data]
Group Start surface Focal length
G2 6 -25.20
G3 16 36.47
G4 31 32.26
G5 33 -28.69
G6 35 74.24
G2a 6 -420.22
G2b 11 -24.94
数値実施例2
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ ∞
1 208.7739 1.5000 1.83481 42.72
2 84.2943 9.5591 1.49700 81.61
3 -142.5028 0.1500
4 65.7145 5.8679 1.49700 81.61
5 213.2392 (d5)
6 154.7875 0.7500 1.60311 60.69
7 53.6721 7.3260
8 -139.9035 3.1273 1.92119 23.96
9 -30.9636 0.7500 1.77250 49.62
10 130.7224 2.0063
11 -39.6223 0.7500 1.77250 49.62
12 2436.2830 (d12)
13(絞り) ∞ 1.0000
14 109.7122 2.9705 1.83500 42.98
15 -120.9804 0.1500
16 49.4779 3.3880 1.49700 81.61
17 -603.0224 0.2000
18 30.1939 5.4732 1.49700 81.61
19 -58.3776 0.7500 1.90366 31.31
20 48.2256 0.1500
21 20.9770 4.6488 1.92119 23.96
22 138.5649 2.0623
23 103.2803 0.7500 1.92119 23.96
24 17.3993 5.0125
25 205.3798 0.7500 1.90366 31.31
26 17.2743 5.0125 1.51823 58.96
27 -35.8912 (d27)
28 25.0298 3.2321 1.88300 40.80
29 116.4402 (d29)
30 111.1313 0.7500 1.91082 35.25
31 23.0920 (d31)
32 -43.1811 0.7500 1.49700 81.61
33 -4230.8320 3.2203 1.92119 23.96
34 -40.1475 (d34)
35 ∞ 4.2000 1.51680 64.20
36 ∞ (BF)
[各種データ]
ズーム比 3.90
広角 中間 望遠
焦点距離 50.00 95.66 195.00
Fナンバー 2.92 3.15 4.05
全画角2ω 24.20 12.58 6.22
像高Y 10.82 10.82 10.82
レンズ全長 150.00 179.03 195.00
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d5 7.0001 36.0364 51.9952
d12 25.8093 17.0176 3.3661
d27 4.1500 12.8966 15.8444
d29 4.9356 3.7625 1.5000
d31 8.7014 6.4962 18.7723
d34 0.1500 3.5686 4.2688
BF 22.9970 22.9970 22.9964
[レンズ群データ]
群 始面 焦点距離
G1 1 113.72
G2 6 -26.70
G3 13 39.20
G4 28 35.52
G5 30 -32.13
G6 32 83.94
G2a 6 -136.61
G2b 8 -35.64
Numerical example 2
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ ∞
1 208.7739 1.5000 1.83481 42.72
2 84.2943 9.5591 1.49700 81.61
3 -142.5028 0.1500
4 65.7145 5.8679 1.49700 81.61
5 213.2392 (d5)
6 154.7875 0.7500 1.60311 60.69
7 53.6721 7.3260
8 -139.9035 3.1273 1.92119 23.96
9 -30.9636 0.7500 1.77250 49.62
10 130.7224 2.0063
11 -39.6223 0.7500 1.77250 49.62
12 2436.2830 (d12)
13 (Aperture) ∞ 1.0000
14 109.7122 2.9705 1.83500 42.98
15 -120.9804 0.1500
16 49.4779 3.3880 1.49700 81.61
17 -603.0224 0.2000
18 30.1939 5.4732 1.49700 81.61
19 -58.3776 0.7500 1.90366 31.31
20 48.2256 0.1500
21 20.9770 4.6488 1.92119 23.96
22 138.5649 2.0623
23 103.2803 0.7500 1.92119 23.96
24 17.3993 5.0125
25 205.3798 0.7500 1.90366 31.31
26 17.2743 5.0125 1.51823 58.96
27 -35.8912 (d27)
28 25.0298 3.2321 1.88300 40.80
29 116.4402 (d29)
30 111.1313 0.7500 1.91082 35.25
31 23.0920 (d31)
32 -43.1811 0.7500 1.49700 81.61
33 -4230.8320 3.2203 1.92119 23.96
34 -40.1475 (d34)
35 ∞ 4.2000 1.51680 64.20
36 ∞ (BF)
[Various data]
Zoom ratio 3.90
Wide angle Medium telephoto Focal length 50.00 95.66 195.00
F number 2.92 3.15 4.05
Full angle 2ω 24.20 12.58 6.22
Image height Y 10.82 10.82 10.82
Total lens length 150.00 179.03 195.00
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d5 7.0001 36.0364 51.9952
d12 25.8093 17.0176 3.3661
d27 4.1500 12.8966 15.8444
d29 4.9356 3.7625 1.5000
d31 8.7014 6.4962 18.7723
d34 0.1500 3.5686 4.2688
BF 22.9970 22.9970 22.9964
[Lens group data]
Group Start surface Focal length
G2 6 -26.70
G4 28 35.52
G5 30 -32.13
G6 32 83.94
G2a 6 -136.61
G2b 8 -35.64
数値実施例3
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ ∞
1 269.3707 1.5000 1.83481 42.72
2 75.7932 10.2700 1.49700 81.61
3 -221.4627 0.1500
4 70.8525 8.8162 1.49700 81.61
5 -840.2516 (d5)
6 52.2233 3.9113 1.80000 29.84
7 457.8148 4.6819
8 -26495.3424 2.0588 1.49700 81.61
9 -126.1466 0.7500 1.88300 40.80
10 33.2379 6.3926
11 -88.7605 2.7734 1.92119 23.96
12 -26.3335 0.7500 1.77250 49.62
13 186.1628 1.7693
14 -30.1439 0.7500 1.77250 49.62
15 -826.8700 (d15)
16(絞り) ∞ 1.0000
17 128.1787 3.0696 1.58913 61.25
18 -73.5621 0.1500
19 72.0649 2.9022 1.49700 81.61
20 -235.7125 0.2000
21 43.8368 5.0144 1.49700 81.61
22 -45.6502 0.7500 1.90366 31.31
23 202.9614 0.1500
24 29.3805 3.7249 1.88300 40.80
25 138.0265 4.0442
26 22.6365 0.7500 1.92119 23.96
27 17.4983 (d27)
28 124.6950 3.7345 1.49700 81.61
29 -18.3665 0.7500 1.88300 40.80
30 -41.0158 0.3000
31 52.1420 2.1582 1.90366 31.31
32 1758.4777 (d32)
33 -35.3980 0.7500 1.88300 40.80
34 42.6754 (d34)
35 41.5646 3.3075 1.92119 23.96
36 529.7030 (d36)
37 ∞ 4.2000 1.51680 64.20
38 ∞ (BF)
[各種データ]
ズーム比 3.90
広角 中間 望遠
焦点距離 50.00 85.46 195.00
Fナンバー 2.86 3.25 4.09
全画角2ω 24.56 14.29 6.25
像高Y 10.82 10.82 10.82
レンズ全長 150.00 172.23 195.00
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d5 3.0000 25.2341 47.9834
d15 20.0732 13.7729 3.4900
d27 14.8715 15.5732 17.8976
d32 1.5000 1.4620 1.5000
d34 8.1471 8.4136 21.9117
d36 0.4252 5.7925 0.2481
BF 20.4536 20.4501 20.4396
[レンズ群データ]
群 始面 焦点距離
G1 1 117.08
G2 6 -21.49
G3 16 28.11
G4 28 46.75
G5 33 -21.81
G6 35 48.80
G2a 6 -80.21
G2b 11 -29.11
Numerical example 3
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ ∞
1 269.3707 1.5000 1.83481 42.72
2 75.7932 10.2700 1.49700 81.61
3 -221.4627 0.1500
4 70.8525 8.8162 1.49700 81.61
5 -840.2516 (d5)
6 52.2233 3.9113 1.80000 29.84
7 457.8148 4.6819
8 -26495.3424 2.0588 1.49700 81.61
9 -126.1466 0.7500 1.88300 40.80
10 33.2379 6.3926
11 -88.7605 2.7734 1.92119 23.96
12 -26.3335 0.7500 1.77250 49.62
13 186.1628 1.7693
14 -30.1439 0.7500 1.77250 49.62
15 -826.8700 (d15)
16 (Aperture) ∞ 1.0000
17 128.1787 3.0696 1.58913 61.25
18 -73.5621 0.1500
19 72.0649 2.9022 1.49700 81.61
20 -235.7125 0.2000
21 43.8368 5.0144 1.49700 81.61
22 -45.6502 0.7500 1.90366 31.31
23 202.9614 0.1500
24 29.3805 3.7249 1.88300 40.80
25 138.0265 4.0442
26 22.6365 0.7500 1.92119 23.96
27 17.4983 (d27)
28 124.6950 3.7345 1.49700 81.61
29 -18.3665 0.7500 1.88300 40.80
30 -41.0158 0.3000
31 52.1420 2.1582 1.90366 31.31
32 1758.4777 (d32)
33 -35.3980 0.7500 1.88300 40.80
34 42.6754 (d34)
35 41.5646 3.3075 1.92119 23.96
36 529.7030 (d36)
37 ∞ 4.2000 1.51680 64.20
38 ∞ (BF)
[Various data]
Zoom ratio 3.90
Wide angle Medium telephoto Focal length 50.00 85.46 195.00
F number 2.86 3.25 4.09
Full angle of view 2ω 24.56 14.29 6.25
Image height Y 10.82 10.82 10.82
Total lens length 150.00 172.23 195.00
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d5 3.0000 25.2341 47.9834
d15 20.0732 13.7729 3.4900
d27 14.8715 15.5732 17.8976
d32 1.5000 1.4620 1.5000
d34 8.1471 8.4136 21.9117
d36 0.4252 5.7925 0.2481
BF 20.4536 20.4501 20.4396
[Lens group data]
Group Start surface Focal length
G2 6 -21.49
G3 16 28.11
G4 28 46.75
G5 33 -21.81
G6 35 48.80
G2a 6 -80.21
G2b 11 -29.11
数値実施例4
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ ∞
1 159.7641 1.5000 1.83481 42.72
2 73.2623 8.1244 1.49700 81.61
3 -298.4321 0.1500
4 109.3463 6.0833 1.49700 81.61
5 -298.0339 (d5)
6 43.2340 3.5759 1.64769 33.84
7 3741.7924 0.7500 1.88300 40.80
8 36.3356 5.9326
9 -50.1757 0.7500 1.77250 49.62
10 278.3701 2.2995
11 -37.9590 0.7500 1.77250 49.62
12 99.8724 3.3269 1.92119 23.96
13 -86.0750 (d13)
14(絞り) ∞ 1.0000
15 119.9768 3.8013 1.69680 55.46
16 -96.5241 0.1500
17 62.6930 3.7418 1.49700 81.61
18 -588.9239 0.2000
19 39.2041 6.1603 1.49700 81.61
20 -74.8258 0.7500 1.90043 37.37
21 98.8104 0.1500
22 21.8056 4.2663 1.74400 44.72
23 37.6615 1.3729
24 24.3716 0.7500 1.90366 31.31
25 16.8989 (d25)
26 45.4354 0.7500 1.88300 40.80
27 18.3679 5.2384 1.58913 61.25
28 -116.4646 0.3000
29 23.7594 2.8421 1.58913 61.25
30 56.2420 (d30)
31 111.1313 0.7500 1.91082 35.25
32 20.9803 (d32)
33 -19.1086 0.7500 1.43700 95.10
34 51.9883 3.7965 1.91082 35.25
35 -44.5378 (d35)
36 ∞ 4.2000 1.51680 64.20
37 ∞ (BF)
[各種データ]
ズーム比 3.90
広角 中間 望遠
焦点距離 50.00 99.17 194.99
Fナンバー 2.92 3.47 4.01
全画角2ω 24.60 12.26 6.26
像高Y 10.82 10.82 10.82
レンズ全長 150.01 175.00 195.00
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d5 3.0000 27.9943 47.9895
d13 27.4917 14.5494 2.1372
d25 11.7426 12.5410 16.7588
d30 3.4373 2.9609 1.5000
d32 8.6379 9.1201 17.0764
d35 0.4252 12.5542 14.2721
BF 21.0583 21.0675 21.0488
[レンズ群データ]
群 始面 焦点距離
G1 1 119.00
G2 6 -29.05
G3 14 37.52
G4 26 43.22
G5 31 -28.51
G6 33 131.53
G2a 6 -120.14
G2b 9 -38.71
Numerical example 4
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ ∞
1 159.7641 1.5000 1.83481 42.72
2 73.2623 8.1244 1.49700 81.61
3 -298.4321 0.1500
4 109.3463 6.0833 1.49700 81.61
5 -298.0339 (d5)
6 43.2340 3.5759 1.64769 33.84
7 3741.7924 0.7500 1.88300 40.80
8 36.3356 5.9326
9 -50.1757 0.7500 1.77250 49.62
10 278.3701 2.2995
11 -37.9590 0.7500 1.77250 49.62
12 99.8724 3.3269 1.92119 23.96
13 -86.0750 (d13)
14 (Aperture) ∞ 1.0000
15 119.9768 3.8013 1.69680 55.46
16 -96.5241 0.1500
17 62.6930 3.7418 1.49700 81.61
18 -588.9239 0.2000
19 39.2041 6.1603 1.49700 81.61
20 -74.8258 0.7500 1.90043 37.37
21 98.8104 0.1500
22 21.8056 4.2663 1.74400 44.72
23 37.6615 1.3729
24 24.3716 0.7500 1.90366 31.31
25 16.8989 (d25)
26 45.4354 0.7500 1.88300 40.80
27 18.3679 5.2384 1.58913 61.25
28 -116.4646 0.3000
29 23.7594 2.8421 1.58913 61.25
30 56.2420 (d30)
31 111.1313 0.7500 1.91082 35.25
32 20.9803 (d32)
33 -19.1086 0.7500 1.43700 95.10
34 51.9883 3.7965 1.91082 35.25
35 -44.5378 (d35)
36 ∞ 4.2000 1.51680 64.20
37 ∞ (BF)
[Various data]
Zoom ratio 3.90
Wide angle Medium telephoto Focal length 50.00 99.17 194.99
F number 2.92 3.47 4.01
Full angle 2ω 24.60 12.26 6.26
Image height Y 10.82 10.82 10.82
Total lens length 150.01 175.00 195.00
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d5 3.0000 27.9943 47.9895
d13 27.4917 14.5494 2.1372
d25 11.7426 12.5410 16.7588
d30 3.4373 2.9609 1.5000
d32 8.6379 9.1201 17.0764
d35 0.4252 12.5542 14.2721
BF 21.0583 21.0675 21.0488
[Lens group data]
Group Start surface Focal length
G2 6 -29.05
G3 14 37.52
G4 26 43.22
G5 31 -28.51
G6 33 131.53
G2a 6 -120.14
G2b 9 -38.71
数値実施例5
単位：mm
[面データ]
面番号 r d nd vd
物面 ∞ ∞
1 217.8696 1.5000 1.83481 42.72
2 76.9125 8.7308 1.49700 81.61
3 -224.6227 0.1500
4 81.5259 7.2416 1.49700 81.61
5 -447.4220 (d5)
6 128.1103 3.3554 1.51742 52.15
7 -81.5850 2.0000
8 -70.4495 0.7500 1.59349 67.00
9 46.9072 5.7074
10 -54.4629 0.7500 1.77250 49.62
11 124.7460 2.7083
12 -30.2801 0.7500 1.77250 49.62
13 210.1233 3.2025 1.92119 23.96
14 -56.4417 (d14)
15(絞り) ∞ 1.0000
16 114.3187 3.8233 1.69680 55.46
17 -85.3520 0.1500
18 69.0892 3.6009 1.49700 81.61
19 -283.8741 0.2000
20 40.8176 6.1610 1.49700 81.61
21 -57.4597 0.7500 1.90043 37.37
22 99.3178 0.1500
23 21.2376 4.2769 1.74400 44.72
24 36.8859 0.3753
25 21.9058 0.7500 1.90366 31.31
26 16.4261 (d26)
27 50.2247 0.7500 1.88300 40.80
28 17.8438 5.4709 1.58913 61.25
29 -97.8224 0.3000
30 24.3665 3.0869 1.58913 61.25
31 84.2164 (d31)
32 111.1313 0.7500 1.91082 35.25
33 20.5621 (d33)
34 -17.7206 0.7500 1.43700 95.10
35 50.4844 3.7447 1.91082 35.25
36 -43.4640 (d36)
37 ∞ 4.2000 1.51680 64.20
38 ∞ (BF)
[各種データ]
ズーム比 3.90
広角 中間 望遠
焦点距離 50.00 98.65 194.98
Fナンバー 2.92 3.38 4.02
全画角2ω 24.50 12.30 6.25
像高Y 10.82 10.82 10.82
レンズ全長 150.00 175.39 194.99
[可変間隔データ]
広角 中間 望遠
d0 ∞ ∞ ∞
d5 3.0000 28.3948 48.0000
d14 22.8156 12.0005 1.8283
d26 13.5062 13.8605 16.6213
d31 3.8832 3.5898 1.5000
d33 8.6805 7.8689 16.0837
d36 0.4252 11.9937 13.2775
BF 20.5493 20.5466 20.5424
[レンズ群データ]
群 始面 焦点距離
G1 1 113.25
G2 6 -25.91
G3 15 35.69
G4 27 40.72
G5 32 -27.81
G6 34 149.40
G2a 6 -98.85
G2b 10 -35.97
Numerical example 5
Unit: mm
[Surface data]
Surface number rd nd vd
Object ∞ ∞
1 217.8696 1.5000 1.83481 42.72
2 76.9125 8.7308 1.49700 81.61
3 -224.6227 0.1500
4 81.5259 7.2416 1.49700 81.61
5 -447.4220 (d5)
6 128.1103 3.3554 1.51742 52.15
7 -81.5850 2.0000
8 -70.4495 0.7500 1.59349 67.00
9 46.9072 5.7074
10 -54.4629 0.7500 1.77250 49.62
11 124.7460 2.7083
12 -30.2801 0.7500 1.77250 49.62
13 210.1233 3.2025 1.92119 23.96
14 -56.4417 (d14)
15 (Aperture) ∞ 1.0000
16 114.3187 3.8233 1.69680 55.46
17 -85.3520 0.1500
18 69.0892 3.6009 1.49700 81.61
19 -283.8741 0.2000
20 40.8176 6.1610 1.49700 81.61
21 -57.4597 0.7500 1.90043 37.37
22 99.3178 0.1500
23 21.2376 4.2769 1.74400 44.72
24 36.8859 0.3753
25 21.9058 0.7500 1.90366 31.31
26 16.4261 (d26)
27 50.2247 0.7500 1.88300 40.80
28 17.8438 5.4709 1.58913 61.25
29 -97.8224 0.3000
30 24.3665 3.0869 1.58913 61.25
31 84.2164 (d31)
32 111.1313 0.7500 1.91082 35.25
33 20.5621 (d33)
34 -17.7206 0.7500 1.43700 95.10
35 50.4844 3.7447 1.91082 35.25
36 -43.4640 (d36)
37 ∞ 4.2000 1.51680 64.20
38 ∞ (BF)
[Various data]
Zoom ratio 3.90
Wide angle Medium telephoto Focal length 50.00 98.65 194.98
F number 2.92 3.38 4.02
Full angle of view 2ω 24.50 12.30 6.25
Image height Y 10.82 10.82 10.82
Total lens length 150.00 175.39 194.99
[Variable interval data]
Wide angle Medium telephoto
d0 ∞ ∞ ∞
d5 3.0000 28.3948 48.0000
d14 22.8156 12.0005 1.8283
d26 13.5062 13.8605 16.6213
d31 3.8832 3.5898 1.5000
d33 8.6805 7.8689 16.0837
d36 0.4252 11.9937 13.2775
BF 20.5493 20.5466 20.5424
[Lens group data]
Group Start surface Focal length
G2 6 -25.91
G3 15 35.69
G4 27 40.72
G5 32 -27.81
G6 34 149.40
G2a 6 -98.85
G2b 10 -35.97
Ｇ１ 第１レンズ群
Ｇ２ 第２レンズ群
Ｇ２ａ 第２ａレンズ群
Ｇ２ｂ 第２ｂレンズ群
Ｇ３ 第３レンズ群
Ｇ４ 第４レンズ群
Ｇ５ 第５レンズ群
Ｇ６ 第６レンズ群
Ｓ 開口絞り
Ｆ フィルター
Ｉ 像面
G1 1st lens group G2 2nd lens group G2a 2a lens group G2b 2b lens group G3 3rd lens group G4 4th lens group G5 5th lens group G6 6th lens group S Aperture stop F Filter I Image surface
Claims (2)
（１）１．００＜ｆ３ｅｗ／Φｍ３ｗ＜１．７５
（２）１．２０＜ｆ３ｅｔ／Φｍ３ｔ＜３．５０
（３）０．５０＜ｍ３ｅｗ／ｍ３ｅｔ＜０.９０
ただし
ｆ３ｅｗ：広角端の第３レンズ群から最終レンズ群までの合成焦点距離
Φｍ３ｗ：広角端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値
ｆ３ｅｔ：望遠端の第３レンズ群から最終レンズ群までの合成焦点距離
Φｍ３ｔ：望遠端の第３レンズ群の先頭面の近軸マージナル光線高に入射瞳径を乗じた値
ｍ３ｅｗ：広角端の第３レンズ群から最終レンズ群までの合成横倍率
ｍ３ｅｔ：望遠端の第３レンズ群から最終レンズ群までの合成横倍率
In order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a negative lens group The fourth lens unit includes a fifth lens unit having a refractive power and a sixth lens unit having a positive refractive power, and the distance between adjacent lens units changes during zooming, and the fourth lens is used for focusing from an object at infinity to a short-distance object. A variable magnification imaging optical system characterized in that the group moves to the object side along the optical axis and satisfies the following conditional expression.
(1) 1.00 <f3ew / Φm3w <1.75
(2) 1.20 <f3et / Φm3t <3.50
(3) 0.50 <m3ew / m3et <0.90
However, f3ew: Composite focal length Φm3w from the third lens group at the wide-angle end to the final lens group: Value obtained by multiplying the paraxial marginal ray height of the front surface of the third lens group at the wide-angle end by the entrance pupil diameter f3et: At the telephoto end Composite focal length Φm3t from the third lens group to the final lens group: a value obtained by multiplying the paraxial marginal ray height of the front surface of the third lens group at the telephoto end by the entrance pupil diameter m3ew: final from the third lens group at the wide angle end Combined lateral magnification up to the lens group m3et: Combined lateral magnification from the third lens group at the telephoto end to the final lens group
（４）０．０＜ｆ２ｂ／ｆ２ａ＜０．５
ただし
ｆ２ａ：第２ａレンズ群の焦点距離
ｆ２ｂ：第２ｂレンズ群の焦点距離 The second lens group is fixed with respect to the image plane at the time of zooming, and is composed of a second refractive power 2a lens group and a negative refractive power 2b lens group in order from the object side to the image side, 2. The variable magnification imaging optical system according to claim 1, wherein vibration is prevented by displacing the second lens group in a direction perpendicular to the optical axis, and the following conditional expression is satisfied: .0 <f2b / f2a <0.5
However, f2a: Focal length of the 2a lens group f2b: Focal length of the 2b lens group
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| JP2014145960A (en) * | 2013-01-30 | 2014-08-14 | Canon Inc | Zoom lens and imaging apparatus having the same |
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| JP2014145960A (en) * | 2013-01-30 | 2014-08-14 | Canon Inc | Zoom lens and imaging apparatus having the same |
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