JP6323045B2 - Variable magnification optical system - Google Patents
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Description
本発明は変倍光学系に関する。 The present invention relates to a variable magnification optical system .
従来、写真用カメラ、電子スチルカメラ、ビデオカメラ等に適した変倍光学系が提案されている（例えば、特許文献１を参照）。 Conventionally, a variable magnification optical system suitable for a photographic camera, an electronic still camera, a video camera, and the like has been proposed (see, for example, Patent Document 1).
しかしながら、上記特許文献１に開示されているズームレンズは、手ブレ等による結像位置変位の補正時の収差補正と広角端状態から望遠端状態への変倍時の収差変動の抑制とが十分に両立していない。
However, the zoom lens 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、手ブレ等による結像位置変位の補正時においても良好な光学性能を備えた変倍光学系を提供することを目的とする。 The present invention has been made in view of such a problem, and an object of the present invention is to provide a variable magnification optical system having good optical performance even when correcting an image position displacement due to camera shake or the like.
上記課題を解決するために本発明は、
光軸に沿って物体側から順に、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、正の屈折力を有する第３レンズ群と、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群の実質的に５個のレンズ群からなり、
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、前記防振レンズ部分よりも像側に配置され、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、
前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有し、
以下の条件式を満足することを特徴とする変倍光学系を提供する。
１．５０＜ｆ４Ｓ／ｆ４＜２．４０
０．１３＜（−ｆ２）／ｆ１＜０．１９
ただし、
ｆ４Ｓ：前記固定レンズ部分の焦点距離
ｆ４ ：前記第４レンズ群の焦点距離
ｆ２ ：前記第２レンズ群の焦点距離
ｆ１ ：前記第１レンズ群の焦点距離
また本発明は、光軸に沿って物体側から順に、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、正の屈折力を有する第３レンズ群と、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群の実質的に５個のレンズ群からなり、
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、前記防振レンズ部分よりも像側に配置され、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、
前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有し、
以下の条件式を満足することを特徴とする変倍光学系を提供する。
１．５０＜ｆ４Ｓ／ｆ４＜２．４０
０．６０＜（−ｆ４）／ｆｗ＜１．４０
ただし、
ｆ４Ｓ：前記固定レンズ部分の焦点距離
ｆ４ ：前記第４レンズ群の焦点距離
ｆｗ：広角端状態における全系の焦点距離
また本発明は、光軸に沿って物体側から順に、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、正の屈折力を有する第３レンズ群と、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群の実質的に５個のレンズ群からなり、
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、
前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有し、
以下の条件式を満足することを特徴とする変倍光学系を提供する。
１．９０＜ｆ４Ｓ／ｆ４＜２．４０
０．１３＜（−ｆ２）／ｆ１＜０．１９
ただし、
ｆ４Ｓ：前記固定レンズ部分の焦点距離
ｆ４ ：前記第４レンズ群の焦点距離
ｆ２ ：前記第２レンズ群の焦点距離
ｆ１ ：前記第１レンズ群の焦点距離
また本発明は、光軸に沿って物体側から順に、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、正の屈折力を有する第３レンズ群と、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群の実質的に５個のレンズ群からなり、
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、
前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有し、
以下の条件式を満足することを特徴とする変倍光学系を提供する。
１．９０＜ｆ４Ｓ／ｆ４＜２．４０
０．６０＜（−ｆ４）／ｆｗ＜１．４０
ただし、
ｆ４Ｓ：前記固定レンズ部分の焦点距離
ｆ４ ：前記第４レンズ群の焦点距離
ｆｗ：広角端状態における全系の焦点距離
また本発明は、光軸に沿って物体側から順に、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、正の屈折力を有する第３レンズ群と、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群の実質的に５個のレンズ群からなり、
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、
前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有し、
前記防振レンズ部分は、正レンズと負レンズとの接合レンズからなり、
前記正レンズは、物体側に凸面を向けた正メニスカスレンズであり、
前記負レンズは、両凹形状の負レンズであり、
以下の条件式を満足することを特徴とする変倍光学系を提供する。
１．５０＜ｆ４Ｓ／ｆ４＜２．７０
ただし、
ｆ４Ｓ：前記固定レンズ部分の焦点距離
ｆ４ ：前記第４レンズ群の焦点距離
In order to solve the above problems, the present invention
A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative refractive power in order from the object side along the optical axis. Substantially consisting of five lens groups, a fourth lens group having a positive refractive power and a fifth lens group having a positive refractive power,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between the three lens groups is reduced, an interval between the third lens group and the fourth lens group is enlarged, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes a vibration-proof lens portion movable in a direction including a direction component orthogonal to the optical axis, and a direction component orthogonal to the optical axis at the time of the movement. A fixed lens portion that is restricted from moving in a direction including
The fixed lens portion has a positive lens component and a negative lens component;
A variable magnification optical system characterized by satisfying the following conditional expression is provided.
1.50 <f4S / f4 <2.40
0.13 <(− f2) / f1 <0.19
However,
f4S: Focal length of the fixed lens portion f4: Focal length of the fourth lens group f2: Focal length of the second lens group f1: Focal length of the first lens group Also, the present invention provides an object along the optical axis. In order from the 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, and a fourth lens group having a negative refractive power And substantially consisting of five lens groups of the fifth lens group having a positive refractive power,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between the three lens groups is reduced, an interval between the third lens group and the fourth lens group is enlarged, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes a vibration-proof lens portion movable in a direction including a direction component orthogonal to the optical axis, and a direction component orthogonal to the optical axis at the time of the movement. A fixed lens portion that is restricted from moving in a direction including
The fixed lens portion has a positive lens component and a negative lens component;
A variable magnification optical system characterized by satisfying the following conditional expression is provided.
1.50 <f4S / f4 <2.40
0.60 <(− f4) / fw <1.40
However,
f4S: focal length of the fixed lens portion f4: focal length of the fourth lens group fw: focal length of the entire system in the wide-angle end state In the present invention, the positive refractive power is increased in order from the object side along the optical axis. A first lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a first lens group having a positive refractive power. It consists essentially of 5 lens groups of 5 lens groups,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between the three lens groups is reduced, an interval between the third lens group and the fourth lens group is enlarged, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes an anti-vibration lens portion that can move in a direction that includes a direction component orthogonal to the optical axis, and a fixed lens portion that is restricted from moving in a direction that includes a direction component orthogonal to the optical axis during the movement. And
The fixed lens portion has a positive lens component and a negative lens component;
A variable magnification optical system characterized by satisfying the following conditional expression is provided.
1.90 <f4S / f4 <2.40
0.13 <(− f2) / f1 <0.19
However,
f4S: Focal length of the fixed lens portion f4: Focal length of the fourth lens group f2: Focal length of the second lens group f1: Focal length of the first lens group Also, the present invention provides an object along the optical axis. In order from the 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, and a fourth lens group having a negative refractive power And substantially consisting of five lens groups of the fifth lens group having a positive refractive power,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between the three lens groups is reduced, an interval between the third lens group and the fourth lens group is enlarged, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes an anti-vibration lens portion that can move in a direction that includes a direction component orthogonal to the optical axis, and a fixed lens portion that is restricted from moving in a direction that includes a direction component orthogonal to the optical axis during the movement. And
The fixed lens portion has a positive lens component and a negative lens component;
A variable magnification optical system characterized by satisfying the following conditional expression is provided.
1.90 <f4S / f4 <2.40
0.60 <(− f4) / fw <1.40
However,
f4S: focal length of the fixed lens portion f4: focal length of the fourth lens group fw: focal length of the entire system in the wide-angle end state In the present invention, the positive refractive power is increased in order from the object side along the optical axis. A first lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a first lens group having a positive refractive power. It consists essentially of 5 lens groups of 5 lens groups,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between the three lens groups is reduced, an interval between the third lens group and the fourth lens group is enlarged, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes an anti-vibration lens portion that can move in a direction that includes a direction component orthogonal to the optical axis, and a fixed lens portion that is restricted from moving in a direction that includes a direction component orthogonal to the optical axis during the movement. And
The fixed lens portion has a positive lens component and a negative lens component;
The anti-vibration lens part consists of a cemented lens of a positive lens and a negative lens,
The positive lens is a positive meniscus lens having a convex surface facing the object side,
The negative lens is a biconcave negative lens,
A variable magnification optical system characterized by satisfying the following conditional expression is provided.
1.50 <f4S / f4 <2.70
However,
f4S: focal length of the fixed lens portion f4: focal length of the fourth lens group
また本発明は、前記変倍光学系を備えたことを特徴とする光学装置を提供する。 The present invention also provides an optical device comprising the variable magnification optical system.
以下、本願の実施形態に係る変倍光学系、光学装置、及び変倍光学系の製造方法について図面を参照しつつ説明する。なお、以下の実施の形態は、発明の理解を容易にするためのものに過ぎず、本願発明の技術的思想を逸脱しない範囲において当業者により実施可能な付加・置換等を施すことを排除することは意図していない。 Hereinafter, a variable magnification optical system, an optical apparatus, and a method for manufacturing the variable magnification optical system according to an embodiment of the present application will be described with reference to the drawings. The following embodiments are only for facilitating the understanding of the invention, and excluding additions and substitutions that can be performed by those skilled in the art without departing from the technical idea of the present invention. It is not intended.
本願の変倍光学系は、光軸に沿って物体側から順に、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、正の屈折力を有する第３レンズ群と、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とを有し、広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有する構成である。 The variable power optical system of the present application includes, in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens having a positive refractive power. A first lens group having a lens group, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, and at the time of zooming from the wide-angle end state to the telephoto end state, Moving to the object side, the interval between the first lens group and the second lens group is enlarged, the interval between the second lens group and the third lens group is reduced, and the third lens group and the fourth lens are reduced. An interval between the groups is enlarged, an interval between the fourth lens group and the fifth lens group is reduced, and the fourth lens group includes an anti-vibration lens portion movable in a direction including a direction component orthogonal to the optical axis; A fixed lens portion that is restricted from moving in a direction including a direction component perpendicular to the optical axis during the movement, Fixed lens portion is configured to have a positive lens component, a negative lens component.
このように、本願の変倍光学系は、５つのレンズ群を有し、広角端状態から望遠端状態への変倍時に、各レンズ群間隔を変化させることで、変倍時の良好な収差補正を図ることができる。 Thus, the variable magnification optical system of the present application has five lens groups, and by changing the distance between the lens groups at the time of zooming from the wide-angle end state to the telephoto end state, good aberrations at the time of zooming are achieved. Correction can be achieved.
また、広角端状態から望遠端状態への変倍時に、第１レンズ群と第２レンズ群の間隔を拡大し、第２レンズ群と第３レンズ群の間隔を縮小し、第３レンズ群と第４レンズ群の間隔を拡大し、第４レンズ群と第５レンズ群の間隔を縮小することで、所定の変倍比を確保することができる。さらに、広角端状態から望遠端状態への変倍時に、第１レンズ群を物体側に移動させる構成とすることで、広角端状態でのレンズ全長の短縮と、第１レンズ群の有効径の縮小ができ、変倍光学系の小型化を図ることができる。 Further, at the time of zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group is enlarged, the distance between the second lens group and the third lens group is reduced, and the third lens group A predetermined zoom ratio can be ensured by enlarging the distance between the fourth lens groups and reducing the distance between the fourth lens group and the fifth lens group. Further, by changing the first lens unit to the object side at the time of zooming from the wide-angle end state to the telephoto end state, the total lens length in the wide-angle end state can be shortened and the effective diameter of the first lens group can be reduced. Reduction can be achieved, and miniaturization of the variable magnification optical system can be achieved.
さらに、第４レンズ群を手ブレ等による結像位置変位の補正を行うために光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とに分割し、固定レンズ部分に正の屈折力のレンズ成分と負の屈折力のレンズ成分を用いることで、量産性を確保しつつ、７倍を超える高倍率ズームレンズにおいても、広角端状態から望遠端状態への変倍時の良好な収差補正と手ブレ等による結像位置変位の補正時の良好な収差補正とを両立することができる。なお、本願において、レンズ成分とは、単レンズ、或いは２枚以上のレンズを接合してなる接合レンズをいう。 Furthermore, in order to correct the displacement of the imaging position due to camera shake or the like in the fourth lens group, a vibration-proof lens portion that can move in a direction including a direction component orthogonal to the optical axis and a direction component orthogonal to the optical axis during the movement Is divided into a fixed lens portion that is restricted in movement in a direction including a positive lens component and a negative refractive power lens component for the fixed lens portion, while ensuring mass productivity. Even in a high-power zoom lens that exceeds 2X, it is possible to achieve both good aberration correction when zooming from the wide-angle end state to the telephoto end state and good aberration correction when correcting the imaging position displacement due to camera shake etc. it can. In the present application, the lens component refers to a single lens or a cemented lens formed by cementing two or more lenses.
また、本願の変倍光学系は、前記固定レンズ部分の焦点距離をｆ４Ｓとし、前記第４レンズ群の焦点距離をｆ４としたとき、以下の条件式を満足するように構成されている。
（１） １．５０＜ｆ４Ｓ／ｆ４＜２．７０
The variable magnification optical system of the present application is configured to satisfy the following conditional expression when the focal length of the fixed lens portion is f4S and the focal length of the fourth lens group is f4.
(1) 1.50 <f4S / f4 <2.70
上記条件式（１）は、広角端状態から望遠端状態への変倍時の良好な収差補正と手ブレ等による結像位置変位の補正時の良好な収差補正との両立に適した第４レンズ群の焦点距離と第４レンズ群中の固定レンズ群の焦点距離との比を規定するものである。 Conditional expression (1) is a fourth suitable for both good aberration correction at the time of zooming from the wide-angle end state to the telephoto end state and good aberration correction at the time of correcting the imaging position displacement due to camera shake or the like. It defines the ratio between the focal length of the lens group and the focal length of the fixed lens group in the fourth lens group.
条件式（１）の上限値を上回ると、第４レンズ群中の固定レンズ部分の屈折力が、第４レンズ群の屈折力と比較して弱くなり、球面収差の補正が困難となる。さらに、所定の変倍比を確保するために防振レンズ部分の屈折力を強くすると、手ブレ等による結像位置変位補正のために防振レンズ部分を偏芯させた際の偏芯収差が過大となり、好ましくない。なお、条件式（１）の上限値を２．５０に設定することで、本願の効果をより確実なものとすることができる。また、条件式（１）の上限値を２．４０に設定することで、本願の効果を更に確実なものとすることができる。 If the upper limit of conditional expression (1) is exceeded, the refractive power of the fixed lens portion in the fourth lens group becomes weaker than the refractive power of the fourth lens group, making it difficult to correct spherical aberration. Furthermore, if the refractive power of the image stabilizing lens part is increased in order to ensure a predetermined zoom ratio, decentration aberrations when the image stabilizing lens part is decentered to correct the imaging position displacement due to camera shake etc. It becomes excessive and is not preferable. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (1) to 2.50. Moreover, the effect of this application can be made more reliable by setting the upper limit of conditional expression (1) to 2.40.
一方、条件式（１）の下限値を下回ると、第４レンズ群の固定レンズ部分の屈折力が強くなりすぎてしまい、正の球面収差が過大となり、補正が困難となる。なお、条件式（１）の下限値を１．８０に設定することで、本願の効果をより確実なものとすることができる。また、条件式（１）の下限値を１．９０に設定することで、本願の効果を更に確実なものとすることができる。 On the other hand, if the lower limit value of conditional expression (1) is not reached, the refractive power of the fixed lens portion of the fourth lens group becomes too strong, the positive spherical aberration becomes excessive, and correction becomes difficult. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (1) to 1.80. Moreover, the effect of the present application can be further ensured by setting the lower limit value of the conditional expression (1) to 1.90.
以上の構成により、手ブレ等による結像位置変位の補正時においても良好な光学性能を備えた変倍光学系を実現することができる。 With the above configuration, it is possible to realize a variable magnification optical system having good optical performance even when the imaging position displacement due to camera shake or the like is corrected.
本願の変倍光学系は、前記固定レンズ部分が、物体側に凹面を向けた正メニスカスレンズと両凹形状の負レンズとで構成されることが望ましい。 In the variable magnification optical system of the present application, it is desirable that the fixed lens portion is composed of a positive meniscus lens having a concave surface facing the object side and a biconcave negative lens.
この構成により、手ブレ等による結像位置変位の補正時の収差補正と広角端状態から望遠端状態への変倍時の収差変動の抑制との両立を実現することができる。 With this configuration, it is possible to realize both of the aberration correction when correcting the imaging position displacement due to camera shake or the like and the suppression of the aberration fluctuation at the time of zooming from the wide-angle end state to the telephoto end state.
また本願の変倍光学系は、前記両凹形状の負レンズの屈折率をｎ４ＳＮとし、前記正メニスカスレンズの屈折率をｎ４ＳＰとしたとき、以下の条件式（２）を満足することが望ましい。
（２） ０．０５＜ｎ４ＳＮ−ｎ４ＳＰ＜０．２５
In the variable power optical system of the present application, it is desirable that the following conditional expression (2) is satisfied when the refractive index of the biconcave negative lens is n4SN and the refractive index of the positive meniscus lens is n4SP.
(2) 0.05 <n4SN-n4SP <0.25
条件式（２）は、広角端状態から望遠端状態への変倍時の良好な収差補正と手ブレ等による結像位置変位の補正時の良好な収差補正との両立に適した第４レンズ群の固定レンズ部分を構成する接合レンズ中の負の屈折力のレンズ成分と正の屈折力のレンズ成分との屈折率差を規定するものである。 Conditional expression (2) is a fourth lens suitable for both good aberration correction at the time of zooming from the wide-angle end state to the telephoto end state and good aberration correction at the time of correction of the imaging position displacement due to camera shake or the like. It defines the difference in refractive index between the lens component having a negative refractive power and the lens component having a positive refractive power in the cemented lens constituting the fixed lens portion of the group.
条件式（２）の上限値を上回ると、接合面による球面収差補正が過大となってしまう。そのため、広角端状態から望遠端状態への変倍時の良好な収差補正が困難となる。なお、条件式（２）の上限値を０．２０に設定することで、本願の効果をより確実なものとすることができる。また、条件式（２）の上限値を０．１８に設定することで、本願の効果を更に確実なものとすることができる。 If the upper limit of conditional expression (2) is exceeded, spherical aberration correction by the cemented surface becomes excessive. This makes it difficult to correct aberrations at the time of zooming from the wide-angle end state to the telephoto end state. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (2) to 0.20. Further, by setting the upper limit value of conditional expression (2) to 0.18, the effect of the present application can be further ensured.
一方、条件式（２）の下限値を下回ると、接合面による球面収差補正が不足してしまう。そのため、防振レンズ部分に球面収差補正の役割を担わせる必要が生じ、手ブレ等による結像位置変位の補正時の良好な収差補正が困難となる。なお、条件式（２）の下限値を０．０８に設定することで、本願の効果をより確実なものとすることができる。また、条件式（２）の下限値を０．１０に設定することで、本願の効果を更に確実なものとすることができる。 On the other hand, if the lower limit of conditional expression (2) is not reached, spherical aberration correction by the cemented surface will be insufficient. For this reason, it is necessary to cause the vibration-proof lens portion to play a role of spherical aberration correction, and it becomes difficult to perform good aberration correction when correcting the imaging position displacement due to camera shake or the like. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (2) to 0.08. In addition, by setting the lower limit value of conditional expression (2) to 0.10, the effect of the present application can be further ensured.
また本願の変倍光学系は、前記両凹形状の負レンズのアッベ数をν４ＳＮとし、前記正メニスカスレンズのアッベ数をν４ＳＰとしたとき、以下の条件式（３）を満足することが望ましい。
（３） ０．００＜ν４ＳＮ−ν４ＳＰ＜２０．００
In the variable power optical system of the present application, it is preferable that the following conditional expression (3) is satisfied when the Abbe number of the negative biconcave lens is ν4SN and the Abbe number of the positive meniscus lens is ν4SP.
(3) 0.00 <ν4SN−ν4SP <20.00
条件式（３）は、第４レンズ群の良好な色収差補正を実現するための、第４レンズ群の固定レンズ部分を構成する接合レンズ中の両凹形状の負レンズと正メニスカスレンズとのアッベ数の差を規定するものである。 Conditional expression (3) is an Abbe of a biconcave negative lens and a positive meniscus lens in the cemented lens constituting the fixed lens portion of the fourth lens group for realizing good chromatic aberration correction of the fourth lens group. It defines the difference in numbers.
条件式（３）の上限値を上回ると、第４レンズ群の固定レンズ部分の色収差補正が過大となってしまう。そのため、防振レンズ部分と合わせて第４レンズ群の色収差補正をする必要があり、防振レンズ部分の色収差補正が不足するため、手ブレ等による結像位置変位の補正のために防振群を偏芯させた際の色収差変動が過大となる。なお、条件式(３)の上限値を１６．００に設定することで、本願の効果をより確実なものとすることができる。また、条件式（３）の上限値を１５．００に設定することで、本願の効果を更に確実なものとすることができる。 If the upper limit value of conditional expression (3) is exceeded, the chromatic aberration correction of the fixed lens portion of the fourth lens group becomes excessive. Therefore, it is necessary to correct the chromatic aberration of the fourth lens group together with the image stabilizing lens portion, and the chromatic aberration correction of the image stabilizing lens portion is insufficient. The chromatic aberration fluctuation when the lens is decentered becomes excessive. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (3) to 16.00. Further, by setting the upper limit value of conditional expression (3) to 15.00, the effect of the present application can be further ensured.
一方、条件式（３）の下限値を下回ると、第４レンズ群の固定レンズ部分の色収差補正が不足してしまう。そのため、防振レンズ部分と合わせて第４レンズ群の色収差補正をする必要があり、防振レンズ部分の色収差補正が過大となるため、手ブレ等による結像位置変位の補正のために防振群を偏芯させた際の色収差変動が過大となる。なお、条件式（３）の下限値を６．００に設定することで、本願の効果をより確実なものとすることができる。また、条件式（３）の下限値を８．００に設定することで、本願の効果を更に確実なものとすることができる。 On the other hand, if the lower limit of conditional expression (3) is not reached, chromatic aberration correction of the fixed lens portion of the fourth lens group will be insufficient. For this reason, it is necessary to correct the chromatic aberration of the fourth lens unit together with the image stabilizing lens portion, and the chromatic aberration correction of the image stabilizing lens portion becomes excessive. The variation in chromatic aberration when the group is decentered becomes excessive. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (3) to 6.00. Further, by setting the lower limit value of conditional expression (3) to 8.00, the effect of the present application can be further ensured.
また本願の変倍光学系は、前記防振レンズ部分が、正レンズと負レンズとの接合レンズで構成されることが望ましい。 In the variable magnification optical system of the present application, it is preferable that the vibration-proof lens portion is constituted by a cemented lens of a positive lens and a negative lens.
この構成により、手ブレ等による結像位置変位の補正時の良好な収差補正を実現することができる。 With this configuration, it is possible to realize good aberration correction when correcting the imaging position displacement due to camera shake or the like.
また本願の変倍光学系は、前記正レンズは、物体側に凸面を向けた正メニスカスレンズであり、前記負レンズは、両凹形状の負レンズであることが望ましい。この構成により、手ブレ等による結像位置変位の補正時の良好な収差補正を実現することができる。 In the variable magnification optical system of the present application, it is desirable that the positive lens is a positive meniscus lens having a convex surface facing the object side, and the negative lens is a biconcave negative lens. With this configuration, it is possible to realize good aberration correction when correcting the imaging position displacement due to camera shake or the like.
また本願の変倍光学系は、前記正レンズの屈折率をｎ４ＶＰとし、前記負レンズの屈折率をｎ４ＶＮとしたとき、以下の条件式（４）を満足することが望ましい。
（４） ０．００＜ｎ４ＶＰ−ｎ４ＶＮ＜０．２０
In the variable power optical system of the present application, it is desirable that the following conditional expression (4) is satisfied when the refractive index of the positive lens is n4VP and the refractive index of the negative lens is n4VN.
(4) 0.00 <n4VP-n4VN <0.20
条件式（４）は、手ブレ等による結像位置変位の補正時の良好な収差補正を実現するための防振レンズ部分を構成する接合レンズ中の正レンズと負レンズの屈折率差を規定するものである。 Conditional expression (4) defines the refractive index difference between the positive lens and the negative lens in the cemented lens that constitutes the anti-vibration lens portion for realizing good aberration correction when correcting the image position displacement due to camera shake or the like. To do.
条件式（４）の上限値を上回ると、接合面による像面湾曲補正が過大となってしまう。そのため、手ブレ等による結像位置変位の補正のために防振レンズ部分を偏芯させた際の偏芯像面倒れが過大となり、補正が困難となる。なお、条件式（４）の上限値を０．１５に設定することで、本願の効果をより確実なものとすることができる。また、条件式（４）の上限値を０．１４に設定することで、本願の効果を更に確実なものとすることができる。 If the upper limit of conditional expression (4) is exceeded, field curvature correction by the joint surface becomes excessive. For this reason, the eccentric image surface tilts when the anti-vibration lens portion is decentered to correct the imaging position displacement due to camera shake or the like, and the correction becomes difficult. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (4) to 0.15. In addition, by setting the upper limit value of conditional expression (4) to 0.14, the effect of the present application can be further ensured.
一方、条件式（４）の下限値を下回ると、接合面による像面湾曲収差の補正が不足してしまう。そのため、手ブレ等による結像位置変位の補正のために防振レンズ部分を偏芯させた際の偏芯像面倒れが過大となり、補正が困難となる。なお、条件式（４）の下限値を０．０５に設定することで、本願の効果をより確実なものとすることができる。また、条件式（４）の下限値を０．０７に設定することで、本願の効果を更に確実なものとすることができる。 On the other hand, if the lower limit of conditional expression (4) is not reached, correction of field curvature aberration by the cemented surface will be insufficient. For this reason, the eccentric image surface tilts when the anti-vibration lens portion is decentered to correct the imaging position displacement due to camera shake or the like, and the correction becomes difficult. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (4) to 0.05. Further, by setting the lower limit value of conditional expression (4) to 0.07, the effect of the present application can be further ensured.
また本願の変倍光学系は、前記負レンズのアッベ数をν４ＶＮとし、前記正レンズのアッベ数をν４ＶＰとしたとき、以下の条件式（５）を満足することが望ましい。
（５） １５．００＜ν４ＶＮ−ν４ＶＰ＜３０．００
In the variable power optical system of the present application, it is desirable that the following conditional expression (5) is satisfied when the Abbe number of the negative lens is ν4VN and the Abbe number of the positive lens is ν4VP.
(5) 15.00 <ν4VN−ν4VP <30.00
条件式（５）は、防振レンズ部分の良好な色収差補正を実現するための、防振レンズ部分を構成する接合レンズ中の負レンズと正レンズのアッベ数の差を規定するものである。 Conditional expression (5) defines the difference between the Abbe numbers of the negative lens and the positive lens in the cemented lens constituting the image stabilizing lens portion in order to realize good chromatic aberration correction of the image stabilizing lens portion.
条件式（５）の上限値を上回ると、防振レンズ部分の色収差補正が過大となってしまう。そのため、手ブレ等による結像位置変位の補正のために防振レンズ部分を偏芯させた際の色収差変動が過大となる。なお、条件式（５）の上限値を２５．００に設定することで、本願の効果をより確実なものとすることができる。また、条件式（５）の上限値を２４．００に設定することで、本願の効果を更に確実なものとすることができる。 If the upper limit value of conditional expression (5) is exceeded, the chromatic aberration correction of the image stabilizing lens part becomes excessive. For this reason, the chromatic aberration fluctuation becomes excessive when the image stabilizing lens portion is decentered to correct the imaging position displacement due to camera shake or the like. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (5) to 25.00. Further, by setting the upper limit value of conditional expression (5) to 24.00, the effect of the present application can be further ensured.
一方、条件式（５）の下限値を下回ると、防振レンズ部分の色収差補正が不足してしまう。そのため、手ブレ等による結像位置変位の補正のために防振レンズ部分を偏芯させた際の色収差変動が過大となる。なお、条件式（５）の下限値を２０．００に設定することで、本願の効果をより確実なものとすることができる。また、条件式（５）の下限値を２１．００に設定することで、本願の効果を更に確実なものとすることができる。 On the other hand, if the lower limit of conditional expression (5) is not reached, the chromatic aberration correction of the image stabilizing lens portion will be insufficient. For this reason, the chromatic aberration fluctuation becomes excessive when the image stabilizing lens portion is decentered to correct the imaging position displacement due to camera shake or the like. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (5) to 20.00. Further, by setting the lower limit value of conditional expression (5) to 21.00, the effect of the present application can be further ensured.
また本願の変倍光学系は、前記第２レンズ群の焦点距離をｆ２とし、前記第１レンズ群の焦点距離をｆ１としたとき、以下の条件式（６）を満足することが望ましい。
（６） ０．１１＜（−ｆ２）／ｆ１＜０．１９
In the variable power optical system of the present application, it is preferable that the following conditional expression (6) is satisfied when the focal length of the second lens group is f2 and the focal length of the first lens group is f1.
(6) 0.11 <(− f2) / f1 <0.19
条件式（６）は、十分な変倍比を確保し、良好な光学性能を実現するための第１レンズ群の焦点距離に対する第２レンズ群の焦点距離を規定するものである。 Conditional expression (6) defines the focal length of the second lens group with respect to the focal length of the first lens group in order to ensure a sufficient zoom ratio and realize good optical performance.
条件式（６）の上限値を上回ると、第１レンズ群の屈折力が強くなり、望遠端における球面収差の劣化が著しくなる。また、広角端における倍率色収差の劣化も顕著となるため好ましくない。なお、条件式（６）の上限値を０．１７とすることで、本願の効果をより確実なものとすることができる。また、条件式（６）の上限値を０．１６とすることで、本願の効果を更に確実なものとすることができる。 If the upper limit value of conditional expression (6) is exceeded, the refractive power of the first lens group will become strong, and the spherical aberration will deteriorate significantly at the telephoto end. Further, the deterioration of lateral chromatic aberration at the wide-angle end becomes remarkable, which is not preferable. In addition, the effect of this application can be made more reliable by making the upper limit of conditional expression (6) 0.17. Moreover, the effect of the present application can be further ensured by setting the upper limit of conditional expression (6) to 0.16.
一方、条件式（６）の下限値を下回ると、第２レンズ群の屈折力が強くなり、広角端における軸外収差、特に像面湾曲と非点収差の補正が困難となる。なお、条件式（６）の下限値を０．１３に設定することで、本願の効果をより確実なものとすることができる。また、条件式（６）の下限値を０．１４に設定することで、本願の効果を更に確実なものとすることができる。 On the other hand, if the lower limit value of conditional expression (6) is not reached, the refractive power of the second lens group becomes strong, and it becomes difficult to correct off-axis aberrations, particularly field curvature and astigmatism at the wide-angle end. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (6) to 0.13. Further, by setting the lower limit value of conditional expression (6) to 0.14, the effect of the present application can be further ensured.
本願の変倍光学系は、第３レンズ群、第４レンズ群、第５レンズ群は収斂、発散、収斂の構造を持ち、さらに、各レンズ群の間隔を変化させることによって、広角端から望遠端にわたって諸収差を良好に補正する構造を有している。第３レンズ群から第５レンズ群の各レンズ群の焦点距離は、以下の条件式（７）、（８）、及び（９）の一部又は全部を満足することが望ましい。 In the variable magnification optical system of the present application, the third lens group, the fourth lens group, and the fifth lens group have a convergent, divergent, and convergent structure. Further, by changing the distance between the lens groups, the telephoto lens is telephoto from the wide-angle end. It has a structure that satisfactorily corrects various aberrations across the edges. It is desirable that the focal length of each lens group from the third lens group to the fifth lens group satisfies a part or all of the following conditional expressions (7), (8), and (9).
条件式（７）は以下の通りである。ただし、前記第３レンズ群の焦点距離をｆ３とし、広角端状態における全系の焦点距離をｆｗとする。
（７） ０．７０＜ｆ３／ｆｗ＜１．８０
Conditional expression (7) is as follows. However, the focal length of the third lens group is f3, and the focal length of the entire system in the wide-angle end state is fw.
(7) 0.70 <f3 / fw <1.80
条件式（７）は、広角端状態における変倍光学系の焦点距離に対する第３レンズ群の適正な焦点距離を規定するものである。本願の変倍光学系は、条件式（７）を満足することにより、レンズ全長の小型化と、像面湾曲、歪曲収差、及び球面収差の良好な補正とを両立することができる。 Conditional expression (7) defines an appropriate focal length of the third lens group with respect to the focal length of the variable magnification optical system in the wide-angle end state. By satisfying conditional expression (7), the variable magnification optical system of the present application can achieve both a reduction in the overall length of the lens and good correction of curvature of field, distortion, and spherical aberration.
条件式（７）の下限値を下回ると、第３レンズ群の屈折力が大きくなり、球面収差をはじめとする諸収差を補正することが困難となる。なお、条件式（７）の下限値を１．００に設定することで、本願の効果をより確実なものとすることができる。 また、条件式（７）の下限値を１．１０に設定することで、本願の効果を更に確実なものとすることができる。 If the lower limit of conditional expression (7) is not reached, the refractive power of the third lens group will increase, making it difficult to correct various aberrations including spherical aberration. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (7) to 1.00. Moreover, the effect of the present application can be further ensured by setting the lower limit of conditional expression (7) to 1.10.
一方、条件式（７）の上限値を上回ると、第３レンズ群の屈折力が小さくなり、レンズ全長の小型化が困難となる。なお、条件式（７）の上限値を１．５０に設定することで、本願の効果をより確実なものとすることができる。また、条件式（７）の上限値を１．４０に設定することで、本願の効果を更に確実なものとすることができる。 On the other hand, if the upper limit of conditional expression (7) is exceeded, the refractive power of the third lens group will be small, and it will be difficult to reduce the overall length of the lens. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (7) to 1.50. Further, by setting the upper limit value of conditional expression (7) to 1.40, the effect of the present application can be further ensured.
条件式（８）は以下の通りである。ただし、前記第４レンズ群の焦点距離をｆ４とし、広角端状態における全系の焦点距離をｆｗとする。
（８） ０．６０＜（−ｆ４）／ｆｗ＜１．６０
Conditional expression (8) is as follows. However, the focal length of the fourth lens group is f4, and the focal length of the entire system in the wide-angle end state is fw.
(8) 0.60 <(− f4) / fw <1.60
条件式（８）は、広角端状態における変倍光学系の焦点距離に対する第４レンズ群の適正な焦点距離を規定するものである。本願の変倍光学系は、条件式（８）を満足することにより、像面湾曲、歪曲収差、及び球面収差の良好な補正を行うことができる。 Conditional expression (8) defines an appropriate focal length of the fourth lens group with respect to the focal length of the variable magnification optical system in the wide-angle end state. The zoom optical system of the present application can satisfactorily correct field curvature, distortion, and spherical aberration by satisfying conditional expression (8).
条件式（８）の下限値を下回ると、第４レンズ群の屈折力が大きくなり、球面収差をはじめとする諸収差を補正することが困難となる。なお、条件式（８）の下限値を０．９０に設定することで、本願の効果をより確実なものとすることができる。 また、条件式（８）の下限値を１．００に設定することで、本願の効果を更に確実なものとすることができる。 If the lower limit of conditional expression (8) is not reached, the refractive power of the fourth lens group will increase, making it difficult to correct various aberrations including spherical aberration. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (8) to 0.90. In addition, by setting the lower limit value of conditional expression (8) to 1.00, the effect of the present application can be further ensured.
一方、条件式（８）の上限値を上回ると、第４レンズ群の屈折力が小さくなり、第３レンズ群、第５レンズ群とあわせて、収斂、発散、収斂の構造によって諸収差を良好に補正する効果が減少し、広角端から望遠端への変倍の際の像面湾曲、歪曲収差、及び球面収差の変化を抑え、良好な収差補正を維持することが困難となる。なお、条件式（８）の上限値を１．４０に設定することで、本願の効果をより確実なものとすることができる。また、条件式（８）の上限値を１．３０に設定することで、本願の効果を更に確実なものとすることができる。 On the other hand, if the upper limit of conditional expression (8) is exceeded, the refractive power of the fourth lens group becomes small, and various aberrations are good due to the structure of convergence, divergence, and convergence together with the third lens group and the fifth lens group. Thus, it becomes difficult to maintain good aberration correction by suppressing changes in field curvature, distortion, and spherical aberration during zooming from the wide-angle end to the telephoto end. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (8) to 1.40. Further, by setting the upper limit value of conditional expression (8) to 1.30, the effect of the present application can be further ensured.
条件式（９）は以下の通りである。ただし、前記第５レンズ群の焦点距離をｆ５とし、広角端状態における全系の焦点距離をｆｗとする。
（９） １．００＜ｆ５／ｆｗ＜２．３０
Conditional expression (9) is as follows. However, the focal length of the fifth lens group is f5, and the focal length of the entire system in the wide-angle end state is fw.
(9) 1.00 <f5 / fw <2.30
条件式（９）は、広角端状態における変倍光学系の焦点距離に対する第５レンズ群の適正な焦点距離を規定するものである。本願の変倍光学系は、条件式（９）を満足することにより、球面収差をはじめとする諸収差の良好な補正をおこなうことができる。 Conditional expression (9) defines an appropriate focal length of the fifth lens group with respect to the focal length of the variable magnification optical system in the wide-angle end state. The variable magnification optical system of the present application can satisfactorily correct various aberrations including spherical aberration by satisfying conditional expression (9).
条件式（９）の下限値を下回ると、第５レンズ群の屈折力が大きくなり、球面収差をはじめとする諸収差を補正することが困難となる。なお、条件式（９）の下限値を１．４０に設定することで、本願の効果をより確実なものとすることができる。 また、条件式（９）の下限値を１．８０に設定することで、本願の効果を更に確実なものとすることができる。 If the lower limit of conditional expression (9) is not reached, the refractive power of the fifth lens group will increase, making it difficult to correct various aberrations including spherical aberration. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (9) to 1.40. Further, by setting the lower limit value of conditional expression (9) to 1.80, the effect of the present application can be further ensured.
一方、条件式（９）の上限値を上回ると、第５レンズ群の屈折力が小さくなり、第３群、第４群とあわせて、収斂、発散、収斂の構造によって諸収差を良好に補正する効果が減少し、広角端から望遠端への変倍の際の像面湾曲、歪曲収差、及び球面収差の変化を抑え、良好な収差補正を維持することが困難となる。なお、条件式（９）の上限値を１．９０に設定することで、本願の効果をより確実なものとすることができる。また、条件式（９）の上限値を１．８０に設定することで、本願の効果を更に確実なものとすることができる。 On the other hand, if the upper limit of conditional expression (9) is exceeded, the refractive power of the fifth lens group will decrease, and together with the third and fourth groups, various aberrations will be well corrected by the structure of convergence, divergence, and convergence. Therefore, it becomes difficult to maintain good aberration correction by suppressing changes in field curvature, distortion, and spherical aberration during zooming from the wide-angle end to the telephoto end. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (9) to 1.90. Further, by setting the upper limit value of conditional expression (9) to 1.80, the effect of the present application can be further ensured.
また本願の変倍光学系は、前記第２レンズ群が、光軸に沿って物体側から順に、第１負レンズと、第２負レンズと、第１正レンズと、第３負レンズとを有することが望ましい。この構成により、広角端における像面湾曲と望遠端における球面収差を同時に補正することができる。 In the variable magnification optical system of the present application, the second lens group includes, in order from the object side along the optical axis, a first negative lens, a second negative lens, a first positive lens, and a third negative lens. It is desirable to have. With this configuration, it is possible to simultaneously correct curvature of field at the wide-angle end and spherical aberration at the telephoto end.
また本願の変倍光学系は、前記第２レンズ群を構成するレンズは少なくとも一つの非球面を有していることが望ましい。この構成により、広角端における像面湾曲及び歪曲収差を良好に補正することができる。 In the variable magnification optical system of the present application, it is desirable that the lenses constituting the second lens group have at least one aspherical surface. With this configuration, it is possible to satisfactorily correct curvature of field and distortion at the wide angle end.
また本願の光学装置は、上述の変倍光学系を備えていることを特徴とする。これにより、量産性を確保しつつ、７倍を超える高倍率ズームレンズにおいて、手ブレ等による結像位置変位の補正時においても良好な光学性能を備えた光学装置を実現することができる。 An optical apparatus according to the present application includes the above-described variable magnification optical system. As a result, it is possible to realize an optical device having good optical performance even when correcting the displacement of the imaging position due to camera shake or the like in a high-power zoom lens exceeding 7 times while ensuring mass productivity.
本願の変倍光学系の製造方法は、
光軸に沿って物体側から順に、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、正の屈折力を有する第３レンズ群と、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群と、を有する変倍光学系の製造方法であって、
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小するように構成し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分を有するようにし、
前記固定レンズ部分は、正レンズ成分と負レンズ成分を有するようにし、
前記固定レンズ部分の焦点距離をｆ４Ｓとし、前記第４レンズ群の焦点距離をｆ４としたとき、以下の条件式（１）を満足するようにすることを特徴とする。
（１） １．５０＜ｆ４Ｓ／ｆ４＜２．７０
The manufacturing method of the variable magnification optical system of this application is
A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative refractive power in order from the object side along the optical axis. A variable power optical system having a fourth lens group having a positive refractive power and a fifth lens group having a positive refractive power,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between three lens groups is reduced, an interval between the third lens group and the fourth lens group is increased, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes an anti-vibration lens portion that can move in a direction that includes a direction component orthogonal to the optical axis, and a fixed lens portion that is restricted from moving in a direction that includes a direction component orthogonal to the optical axis during the movement. And have
The fixed lens portion has a positive lens component and a negative lens component;
When the focal length of the fixed lens portion is f4S and the focal length of the fourth lens group is f4, the following conditional expression (1) is satisfied.
(1) 1.50 <f4S / f4 <2.70
これにより、手ブレ等による結像位置変位の補正時においても良好な光学性能を備えた変倍光学系を製造することができる。 As a result, it is possible to manufacture a variable magnification optical system having a good optical performance even when the imaging position displacement due to camera shake or the like is corrected.
以下、本願の数値実施例に係る変倍光学系を添付図面に基づいて説明する。 Hereinafter, a variable magnification optical system according to numerical examples of the present application will be described with reference to the accompanying drawings.
（第１実施例）
図１は、本願の第１実施例に係る変倍光学系のレンズ構成を示す図である。
(First embodiment)
FIG. 1 is a diagram showing a lens configuration of a variable magnification optical system according to the first example of the present application.
本第１実施例に係る変倍光学系は、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、開口絞りＳと、正の屈折力を有する第３レンズ群Ｇ３と、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５とから構成されている。 The variable magnification optical system according to the first example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, A third lens group G3 having a negative refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
第１レンズ群Ｇ１は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ１１と両凸形状の正レンズＬ１２との接合正レンズと、物体側に凸面を向けた正メニスカスレンズＬ１３とからなる。 The first lens group G1 includes, in order from the object side, a cemented positive lens composed of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
第２レンズ群Ｇ２は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ２１と、両凹形状の負レンズＬ２２と、両凸形状の正レンズＬ２３と両凹形状の負レンズＬ２４との接合正レンズとからなる。第２レンズ群Ｇ２の負メニスカスレンズＬ２１は、物体側レンズ面に非球面形状の薄いプラスチック樹脂層を備えている。 The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a biconcave negative lens L24. This is a positive lens. The negative meniscus lens L21 of the second lens group G2 includes an aspheric thin plastic resin layer on the object side lens surface.
第３レンズ群Ｇ３は、物体側から順に、両凸形状の正レンズＬ３１と、両凸形状の正レンズＬ３２と両凹形状の負レンズＬ３３との接合正レンズとからなる。 The third lens group G3 includes, in order from the object side, a biconvex positive lens L31, and a cemented positive lens of a biconvex positive lens L32 and a biconcave negative lens L33.
第４レンズ群Ｇ４は、物体側から順に、防振レンズ部分Ｇ４Ｆと、固定レンズ部分Ｇ４Ｒとからなる。防振レンズ部分Ｇ４Ｆは、両凹形状の負レンズＬ４１と物体側に凸面を向けた正メニスカスレンズＬ４２との接合負レンズとからなる。固定レンズ部分Ｇ４Ｒは、物体側に凹面を向けた正メニスカスレンズＬ４３と両凹形状の負レンズＬ４４との接合負レンズとからなる。 The fourth lens group G4 is composed of an anti-vibration lens portion G4F and a fixed lens portion G4R in order from the object side. The anti-vibration lens portion G4F includes a cemented negative lens of a biconcave negative lens L41 and a positive meniscus lens L42 having a convex surface facing the object side. The fixed lens portion G4R includes a cemented negative lens composed of a positive meniscus lens L43 having a concave surface directed toward the object side and a biconcave negative lens L44.
第５レンズ群Ｇ５は、物体側から順に、物体側に凹面を向けた正メニスカスレンズＬ５１と、両凸形状の正レンズＬ５２と物体側に凹面を向けた負メニスカスレンズＬ５３との接合正レンズとからなる。 The fifth lens group G5 includes, in order from the object side, a positive meniscus lens L51 having a concave surface directed toward the object side, a cemented positive lens composed of a biconvex positive lens L52 and a negative meniscus lens L53 having a concave surface directed toward the object side. Consists of.
本実施例に係る変倍光学系では、広角端状態から望遠端状態への変倍時に、第１レンズ群Ｇ１と第２レンズ群Ｇ２の空気間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の空気間隔が減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の空気間隔が増大し、第４レンズ群Ｇ４と第５レンズ群Ｇ５の空気間隔が減少するように、第１レンズ群Ｇ１から第５レンズ群Ｇ５の各レンズ群が物体側へ移動する。なお、このとき、開口絞りＳは第３レンズ群とともに移動する。 In the zoom optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases during zooming from the wide-angle end state to the telephoto end state, and the second lens group G2 and the third lens group G3. The first air gap is reduced so that the air gap between the lens group G3 decreases, the air gap between the third lens group G3 and the fourth lens group G4 increases, and the air gap between the fourth lens group G4 and the fifth lens group G5 decreases. Each lens group from the lens group G1 to the fifth lens group G5 moves to the object side. At this time, the aperture stop S moves together with the third lens group.
また本実施例に係る変倍光学系では、第２レンズ群Ｇ２を物体側へ移動させることにより、無限遠物点から近距離物点への合焦が行われる。 In the zoom optical system according to the present embodiment, focusing from an infinite object point to a short-distance object point is performed by moving the second lens group G2 to the object side.
また本実施例に係る変倍光学系では、防振レンズ部分Ｇ４Ｆを光軸と直交する方向成分を含む方向へ移動させることによって、手ブレ等による結像位置変位を補正する。 In the variable magnification optical system according to the present embodiment, the image forming position displacement due to camera shake or the like is corrected by moving the image stabilizing lens portion G4F in a direction including a direction component orthogonal to the optical axis.
なお、全系の焦点距離がｆで、防振係数（ブレ補正での移動レンズ群の移動量に対する結像面での像移動量比）がＫのレンズで角度θの回転ブレを補正するには、ブレ補正用の移動レンズ群を（ｆ・tanθ）/Ｋだけ光軸と直交方向に移動させればよい。第１実施例の広角端状態においては、防振係数１．００であり、焦点距離は１８．５ｍｍであるので、０．６０°の回転ブレを補正するための防振レンズ部分の移動量は０．１９ｍｍである。第１実施例の望遠端状態においては、防振係数１．６２であり、焦点距離は１３６．００ｍｍであるので、０．２０°の回転ブレを補正するための防振レンズ部分の移動量は０．２９ｍｍである。 It should be noted that when the focal length of the entire system is f and the image stabilization coefficient (the ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) is K, the rotational shake at an angle θ is corrected. The moving lens group for blur correction may be moved in the direction orthogonal to the optical axis by (f · tan θ) / K. In the first embodiment at the wide-angle end state, the image stabilization coefficient is 1.00 and the focal length is 18.5 mm. Therefore, the amount of movement of the image stabilization lens portion for correcting the rotation blur of 0.60 ° is as follows. 0.19 mm. In the telephoto end state of the first embodiment, the image stabilization coefficient is 1.62 and the focal length is 136.00 mm. Therefore, the amount of movement of the image stabilization lens portion for correcting the rotation blur of 0.20 ° is as follows. 0.29 mm.
以下の表１に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 1 below lists values of specifications of the variable magnification optical system according to the present example.
［面データ]において、「面番号」は光軸に沿って物体側から数えたレンズ面の順番を、「r」は曲率半径を、「d」は間隔（第ｎ面（ｎは整数）と第ｎ＋１面との間隔）を、「nd」はｄ線（波長λ=５８７．６ｎｍ）に対する屈折率、「νd」はｄ線（波長λ＝５８７．６ｎｍ）に対するアッベ数をそれぞれ示している。また、「物面」は物体面を、「可変」は可変の面間隔を、「絞り」は開口絞りＳを、「BF」はバックフォーカスを、「像面」は像面Ｉをそれぞれ示している。なお、曲率半径「r」において「∞」は平面を示し、空気の屈折率ｎｄ=1.00000の記載は省略している。 また、非球面には面番号に「*」を付して曲率半径ｒの欄には近軸曲率半径を示している。 In [Surface Data], “Surface Number” is the order of the lens surfaces counted from the object side along the optical axis, “r” is the radius of curvature, “d” is the distance (nth surface (n is an integer)) “Nd” represents the refractive index with respect to the d-line (wavelength λ = 587.6 nm), and “νd” represents the Abbe number with respect to the d-line (wavelength λ = 587.6 nm). “Object surface” indicates the object surface, “Variable” indicates the variable surface interval, “Aperture” indicates the aperture stop S, “BF” indicates the back focus, and “Image surface” indicates the image surface I. Yes. In the curvature radius “r”, “∞” indicates a plane, and the description of the refractive index nd = 1.00000 of air is omitted. Further, “*” is attached to the surface number of the aspherical surface, and the paraxial radius of curvature is shown in the column of the radius of curvature r.
［非球面データ］には、［面データ］に示した非球面について、その形状を次式で表した場合の非球面係数及び円錐定数を示す。
ｘ＝（ｈ２／ｒ）／［１＋｛１−κ（ｈ／ｒ）２｝１／２］
＋Ａ４ｈ４＋Ａ６ｈ６＋Ａ８ｈ８＋Ａ１０ｈ１０
ここで、「x」は光軸から垂直方向の高さ「h」における各非球面の頂点の接平面から光軸方向に沿った距離（サグ量）、「κ」は円錐定数、「Ａ４」,「Ａ６」,「Ａ８」,「Ａ１０」は非球面係数、「r」は基準球面の曲率半径（近軸曲率半径）とする。また、「Ｅ−ｎ」（ｎ：整数）は「×10-n」を示し、例えば「1.234E-05」は「1.234×10-5」を示す。
[Aspherical data] shows an aspherical coefficient and a conic constant when the shape of the aspherical surface shown in [Surface data] is expressed by the following equation.
x = (h 2 / r) / [1+ {1−κ (h / r) 2 } 1/2 ]
+ A4h 4 + A6h 6 + A8h 8 + A10h 10
Here, “x” is the distance (sag amount) along the optical axis direction from the tangent plane of each aspherical vertex at height “h” in the vertical direction from the optical axis, “κ” is the conic constant, and “A4” , “A6”, “A8”, “A10” are aspherical coefficients, and “r” is the radius of curvature (paraxial curvature radius) of the reference spherical surface. “E−n” (n: integer) represents “× 10 −n ”, for example “1.234E-05” represents “1.234 × 10 −5 ”.
［各種データ］において、「f」は焦点距離を、「FNO」はＦナンバーを、「ω」は半画角（単位は「°」）を、「Ymax」は最大像高を、「TL」は光学系全長（レンズ面の第１面から像面Ｉまでの光軸上の距離）を、「BF」はバックフォーカスを、それぞれ示している。 In [Various data], “f” is the focal length, “FNO” is the F number, “ω” is the half angle of view (unit is “°”), “Ymax” is the maximum image height, and “TL”. Indicates the total length of the optical system (distance on the optical axis from the first surface of the lens surface to the image plane I), and “BF” indicates the back focus.
［可変間隔データ］において、「ｄｎ」は第ｎ面と第ｎ＋１面の可変の面間隔を示している。なお、［各種データ］及び［可変間隔データ］において、「W」は広角端状態、「M」は中間焦点距離状態、「T」は望遠端状態、「無限遠」は無限遠物点への合焦時、「近距離」は近距離物点への合焦時をそれぞれ示す。 In [variable interval data], “dn” indicates a variable interval between the n-th surface and the (n + 1) -th surface. In [Various data] and [Variable interval data], “W” indicates the wide-angle end state, “M” indicates the intermediate focal length state, “T” indicates the telephoto end state, and “infinity” indicates the object point at infinity. At the time of focusing, “short distance” indicates the time of focusing on a short distance object point.
［レンズ群データ］には、各レンズ群の始面と焦点距離ｆを示している。 [Lens Group Data] indicates the start surface and focal length f of each lens group.
［条件式対応値］には、本実施例に係る変倍光学系の各条件式の対応値を示している。 [Conditional Expression Corresponding Value] indicates the corresponding value of each conditional expression of the variable magnification optical system according to the present example.
ここで、表1に掲載されている焦点距離f、曲率半径r、面間隔、その他長さの単位は一般に「ｍｍ」が使われる。しかしながら光学系は、比例拡大又は比例縮小しても同等の光学性能が得られるため、これに限られるものではない。 Here, “mm” is generally used as a unit of the focal length f, the radius of curvature r, the surface interval, and other lengths listed in Table 1. However, the optical system is not limited to this because an equivalent optical performance can be obtained even when proportionally enlarged or proportionally reduced.
なお、以上に述べた表１の符号は、後述する各実施例の表においても同様に用いるものとする。 In addition, the code | symbol of Table 1 described above shall be similarly used also in the table | surface of each Example mentioned later.
［表１］
[面データ]
面番号 r d nd νd
物面 ∞
1 172.7442 2.000 1.80518 25.45
2 78.2695 7.121 1.58913 61.22
3 -534.0802 0.100
4 62.8862 5.023 1.60311 60.69
5 179.6109 可変
6* 400.0000 0.150 1.55389 38.23
7 269.2163 1.200 1.80610 40.97
8 14.1987 6.368
9 -49.1716 1.000 1.80610 40.97
10 54.7615 0.300
11 30.0902 5.405 1.84666 23.78
12 -37.2107 1.000 1.80610 40.97
13 304.1011 可変
14(絞り) ∞ 0.400
15 65.9526 2.993 1.51680 63.88
16 -27.7250 0.100
17 22.7969 3.616 1.59319 67.90
18 -31.4211 1.000 1.84666 23.78
19 421.8525 可変
20 -71.8721 1.000 1.72916 54.61
21 13.1771 2.771 1.85026 32.35
22 36.3628 2.400
23 -98.0130 3.256 1.68893 31.16
24 -13.3620 1.000 1.83481 42.73
25 241.8576 可変
26 -311.1392 4.659 1.51680 63.88
27 -18.6556 0.100
28 47.0000 7.266 1.48749 70.31
29 -17.2184 1.300 1.90366 31.27
30 -46.1279 BF
像面 ∞
[非球面データ]
第６面
κ = 5.0810
Ａ４ = 8.99799E-06
Ａ６ = -4.28174E-08
Ａ８ = 1.68497E-10
Ａ１０ = -3.08244E-13
［各種データ］
変倍比 7.35
W M T
f 18.5 69.5 136.0
FNO 3.46 5.23 5.86
2ω 78.08 22.48 11.66
Ymax 14.25 14.25 14.25
TL 141.32 175.88 196.05
BF 38.32 60.50 67.32
［可変間隔データ］
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.500 35.919 55.112 1.812 35.350 54.092
d13 30.430 8.391 2.550 31.118 8.961 3.570
d19 2.500 7.286 8.442 2.500 7.286 8.442
d25 7.042 2.256 1.100 7.042 2.256 1.100
［レンズ群データ］
群 始面 ｆ
1 1 107.769
2 6 -16.800
3 14 23.214
4 20 -20.734
5 26 30.689
［条件式対応値］
(１) ｆ４Ｓ／ｆ４ = 2.230
(２) ｎ４ＳＮ−ｎ４ＳＰ = 0.146
(３) ν４ＳＮ−ν４ＳＰ = 11.57
(４) ｎ４ＶＰ−ｎ４ＶＮ = 0.121
(５) ν４ＶＮ−ν４ＶＰ = 22.26
(６)（−ｆ２）／ｆ１ = 0.156
(７) ｆ３／ｆｗ = 1.255
(８)（−ｆ４）／ｆｗ = 1.121
(９) ｆ５／ｆｗ = 1.659
[Table 1]
[Surface data]
Surface number rd nd νd
Object ∞
1 172.7442 2.000 1.80518 25.45
2 78.2695 7.121 1.58913 61.22
3 -534.0802 0.100
4 62.8862 5.023 1.60311 60.69
5 179.6109 Variable
6 * 400.0000 0.150 1.55389 38.23
7 269.2163 1.200 1.80610 40.97
8 14.1987 6.368
9 -49.1716 1.000 1.80610 40.97
10 54.7615 0.300
11 30.0902 5.405 1.84666 23.78
12 -37.2107 1.000 1.80610 40.97
13 304.1011 Variable
14 (Aperture) ∞ 0.400
15 65.9526 2.993 1.51680 63.88
16 -27.7250 0.100
17 22.7969 3.616 1.59319 67.90
18 -31.4211 1.000 1.84666 23.78
19 421.8525 Variable
20 -71.8721 1.000 1.72916 54.61
21 13.1771 2.771 1.85026 32.35
22 36.3628 2.400
23 -98.0130 3.256 1.68893 31.16
24 -13.3620 1.000 1.83481 42.73
25 241.8576 Variable
26 -311.1392 4.659 1.51680 63.88
27 -18.6556 0.100
28 47.0000 7.266 1.48749 70.31
29 -17.2184 1.300 1.90366 31.27
30 -46.1279 BF
Image plane ∞
[Aspherical data]
6th page
κ = 5.0810
A4 = 8.99799E-06
A6 = -4.28174E-08
A8 = 1.68497E-10
A10 = -3.08244E-13
[Various data]
Scaling ratio 7.35
WMT
f 18.5 69.5 136.0
FNO 3.46 5.23 5.86
2ω 78.08 22.48 11.66
Ymax 14.25 14.25 14.25
TL 141.32 175.88 196.05
BF 38.32 60.50 67.32
[Variable interval data]
WMTWMT
Infinity infinity infinity infinity short distance short distance short distance
d5 2.500 35.919 55.112 1.812 35.350 54.092
d13 30.430 8.391 2.550 31.118 8.961 3.570
d19 2.500 7.286 8.442 2.500 7.286 8.442
d25 7.042 2.256 1.100 7.042 2.256 1.100
[Lens group data]
Group start surface f
1 1 107.769
2 6 -16.800
3 14 23.214
4 20 -20.734
5 26 30.689
[Conditional expression values]
(1) f4S / f4 = 2.230
(2) n4SN-n4SP = 0.146
(3) ν4SN-ν4SP = 11.57
(4) n4VP-n4VN = 0.121
(5) ν4VN−ν4VP = 22.26
(6) (−f2) /f1=0.156
(7) f3 / fw = 1.255
(8) (−f4) /fw=1.121
(9) f5 / fw = 1.659
図２（ａ）、及び図２（ｂ）はそれぞれ、第１実施例に係る変倍光学系の広角端状態における無限遠合焦時の諸収差図、及び０．６０°の回転ブレに対してブレ補正を行った際のメリディオナル横収差図である。 FIGS. 2A and 2B are graphs showing various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the first example and a rotational blur of 0.60 °, respectively. FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
図３は、第１実施例に係る変倍光学系の中間焦点距離状態における無限遠合焦時の諸収差図である。 FIG. 3 is a diagram of various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the first example.
図４（ａ）、及び図４（ｂ）はそれぞれ、第１実施例に係る変倍光学系の望遠端状態における無限遠合焦時の諸収差図、及び０．２０°の回転ブレに対してブレ補正を行った際のメリディオナル横収差図である。 FIGS. 4A and 4B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system according to the first example, and a rotational blur of 0.20 °, respectively. FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
図５（ａ）、図５（ｂ）、及び図５（ｃ）はそれぞれ、第１実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離合焦時の諸収差図である。 5 (a), 5 (b), and 5 (c) respectively show the close-up focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first example. FIG.
図２ないし図５の各収差図において、「FNO」はFナンバーを、「NA」は開口数を、「Y」は像高をそれぞれ示す。なお、球面収差図では最大口径に対応するFナンバーまたは開口数の値を示し、非点収差図及び歪曲収差図では像高の最大値をそれぞれ示し、コマ収差図では各像高の値を示す。「d」はd線（波長λ=587.6nm）を、「g」はg線（波長λ=435.8nm）をそれぞれ示す。非点収差図において、実線はサジタル像面、破線はメリディオナル像面をそれぞれ示す。なお、以下に示す各実施例の収差図においても、本実施例と同様の符号を用いる。 2 to 5, “FNO” indicates an F number, “NA” indicates a numerical aperture, and “Y” indicates an image height. The spherical aberration diagram shows the F-number or numerical aperture value corresponding to the maximum aperture, the astigmatism diagram and the distortion diagram show the maximum image height, and the coma diagram shows the value of each image height. . “D” indicates a d-line (wavelength λ = 587.6 nm), and “g” indicates a g-line (wavelength λ = 435.8 nm). In the astigmatism diagram, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane. Note that the same reference numerals as in this example are also used in the aberration diagrams of the examples shown below.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離合焦時、手ブレ等による結像位置変位の補正時にも優れた結像性能を有していることがわかる。 From the various aberration diagrams, the variable magnification optical system according to the present example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the imaging position displacement due to camera shake or the like is corrected.
（第２実施例）
図６は、本願の第２実施例に係る変倍光学系のレンズ構成を示す図である。
(Second embodiment)
FIG. 6 is a diagram showing a lens configuration of a variable magnification optical system according to the second example of the present application.
本実施例に係る変倍光学系は、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、開口絞りＳと、正の屈折力を有する第３レンズ群Ｇ３と、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５とから構成されている。 The variable magnification optical system according to the present example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, and a positive refraction. The lens unit includes a third lens group G3 having power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power.
第１レンズ群Ｇ１は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ１１と両凸形状の正レンズＬ１２との接合正レンズと、物体側に凸面を向けた正メニスカスレンズＬ１３とからなる。 The first lens group G1 includes, in order from the object side, a cemented positive lens composed of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
第２レンズ群Ｇ２は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ２１と、両凹形状の負レンズＬ２２と、両凸形状の正レンズＬ２３と、両凹形状の負レンズＬ２４とからなる。第２レンズ群Ｇ２の負メニスカスレンズＬ２１は、物体側レンズ面に非球面形状の薄いプラスチック樹脂層を備えている。 The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a biconcave negative lens L24. It consists of. The negative meniscus lens L21 of the second lens group G2 includes an aspheric thin plastic resin layer on the object side lens surface.
第３レンズ群Ｇ３は、物体側から順に、両凸形状の正レンズＬ３１と、両凸形状の正レンズＬ３２と物体側に凹面を向けた負メニスカスレンズＬ３３との接合正レンズとからなる。 The third lens group G3 includes, in order from the object side, a biconvex positive lens L31, a cemented positive lens of a biconvex positive lens L32, and a negative meniscus lens L33 having a concave surface facing the object side.
第４レンズ群Ｇ４は、物体側から順に、防振レンズ部分Ｇ４Ｆと、防振のためには移動しない固定レンズ部分Ｇ４Ｒとからなる。防振レンズ部分Ｇ４Ｆは、両凹形状の負レンズＬ４１と物体側に凸面を向けた正メニスカスレンズＬ４２との接合負レンズとからなる。固定レンズ部分Ｇ４Ｒは、物体側に凹面を向けた正メニスカスレンズＬ４３と両凹形状の負レンズＬ４４との接合負レンズとからなる。 The fourth lens group G4 includes, in order from the object side, an anti-vibration lens portion G4F and a fixed lens portion G4R that does not move for image stabilization. The anti-vibration lens portion G4F includes a cemented negative lens of a biconcave negative lens L41 and a positive meniscus lens L42 having a convex surface facing the object side. The fixed lens portion G4R includes a cemented negative lens composed of a positive meniscus lens L43 having a concave surface directed toward the object side and a biconcave negative lens L44.
第５レンズ群Ｇ５は、物体側から順に、物体側に凹面を向けた正メニスカスレンズＬ５１と、両凸形状の正レンズＬ５２と物体側に凹面を向けた負メニスカスレンズＬ５３との接合正レンズとからなる。 The fifth lens group G5 includes, in order from the object side, a positive meniscus lens L51 having a concave surface directed toward the object side, a cemented positive lens composed of a biconvex positive lens L52 and a negative meniscus lens L53 having a concave surface directed toward the object side. Consists of.
本実施例に係る変倍光学系では、広角端状態から望遠端状態への変倍時に、第１レンズ群Ｇ１と第２レンズ群Ｇ２の空気間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の空気間隔が減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の空気間隔が増大し、第４レンズ群Ｇ４と第５レンズ群Ｇ５の空気間隔が減少するように、第１レンズ群Ｇ１から第５レンズ群Ｇ５の各レンズ群が物体側へ移動する。なお、このとき、開口絞りＳは第３レンズ群とともに移動する。 In the zoom optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases during zooming from the wide-angle end state to the telephoto end state, and the second lens group G2 and the third lens group G3. The first air gap is reduced so that the air gap between the lens group G3 decreases, the air gap between the third lens group G3 and the fourth lens group G4 increases, and the air gap between the fourth lens group G4 and the fifth lens group G5 decreases. Each lens group from the lens group G1 to the fifth lens group G5 moves to the object side. At this time, the aperture stop S moves together with the third lens group.
また本実施例に係る変倍光学系では、第２レンズ群Ｇ２を物体側へ移動させることにより、無限遠物点から近距離物点への合焦が行われる。 In the zoom optical system according to the present embodiment, focusing from an infinite object point to a short-distance object point is performed by moving the second lens group G2 to the object side.
また本実施例に係る変倍光学系では、防振レンズ部分Ｇ４Ｆを光軸と直交する成分を含む方向へ移動させることによって、手ブレ等による結像位置変位を補正する。 In the variable magnification optical system according to the present embodiment, the imaging position displacement due to camera shake or the like is corrected by moving the image stabilizing lens portion G4F in a direction including a component orthogonal to the optical axis.
なお、全系の焦点距離がｆで、防振係数（ブレ補正での移動レンズ群の移動量に対する結像面での像移動量比）がＫのレンズで角度θの回転ブレを補正するには、ブレ補正用の移動レンズ群を（ｆ・tanθ）/Ｋだけ光軸と直交方向に移動させればよい。第２実施例の広角端状態においては、防振係数１．００であり、焦点距離は１８．５ｍｍであるので、０．６０°の回転ブレを補正するための防振レンズ部分の移動量は０．１９ｍｍである。第２実施例の望遠端状態においては、防振係数１．６０であり、焦点距離は１３６．００ｍｍであるので、０．２０°の回転ブレを補正するための防振レンズ部分の移動量は０．３０ｍｍである。 It should be noted that when the focal length of the entire system is f and the image stabilization coefficient (the ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) is K, the rotational shake at an angle θ is corrected. The moving lens group for blur correction may be moved in the direction orthogonal to the optical axis by (f · tan θ) / K. In the wide-angle end state of the second embodiment, the image stabilization coefficient is 1.00 and the focal length is 18.5 mm. Therefore, the amount of movement of the image stabilization lens portion for correcting the rotation blur of 0.60 ° is as follows. 0.19 mm. In the telephoto end state of the second embodiment, since the image stabilization coefficient is 1.60 and the focal length is 136.00 mm, the amount of movement of the image stabilization lens portion for correcting the rotation blur of 0.20 ° is as follows. 0.30 mm.
以下の表２に、本実施例に係る変倍光学系の諸元の値を掲げる。
［表２］
[面データ]
面番号 r d nd νd
物面 ∞
1 191.1156 2.000 1.80518 25.45
2 82.9848 7.200 1.58913 61.22
3 -355.4078 0.100
4 61.7520 4.857 1.60311 60.69
5 155.9275 可変
6* 400.0000 0.150 1.55389 38.23
7 303.1666 1.200 1.80610 40.97
8 14.4476 6.037
9 -51.6369 1.000 1.80610 40.97
10 52.4492 0.300
11 29.1080 5.549 1.84666 23.78
12 -35.6410 0.263
13 -33.7318 1.000 1.80610 40.97
14 241.7240 可変
15(絞り) ∞ 0.400
16 52.0289 3.076 1.51680 63.88
17 -28.2824 0.100
18 25.2614 3.638 1.59319 67.90
19 -26.4079 1.000 1.84666 23.78
20 -641.6391 可変
21 -68.1715 1.000 1.72916 54.61
22 13.3598 2.769 1.85026 32.35
23 37.4710 2.400
24 -66.3717 3.119 1.71736 29.57
25 -13.6861 1.000 1.83481 42.73
26 1321.2398 可変
27 -401.8684 4.776 1.58913 61.22
28 -20.3408 0.100
29 64.3720 7.000 1.48749 70.31
30 -16.7736 1.300 1.90366 31.27
31 -44.5828 BF
像面 ∞
[非球面データ]
第6面
κ = 5.0810
Ａ４ = 6.73638E-06
Ａ６ = -2.66929E-08
Ａ８ = 9.66840E-11
Ａ１０ = -1.93090E-13
［各種データ］
変倍比 7.35
W M T
f 18.5 70.0 136.0
FNO 3.48 5.13 5.87
2ω 78.08 22.18 11.60
Ymax 14.25 14.25 14.25
TL 142.31 176.13 196.21
BF 38.12 58.06 66.92
［可変間隔データ］
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.500 37.986 55.283 1.832 37.390 54.324
d14 30.329 8.711 2.636 30.996 9.307 3.595
d20 2.500 7.522 8.804 2.500 7.522 8.804
d26 7.534 2.512 1.230 7.534 2.512 1.230
［レンズ群データ］
群 始面 ｆ
1 1 108.265
2 6 -16.603
3 16 22.924
4 21 -21.530
5 27 32.038
［条件式対応値］
(１) ｆ４Ｓ／ｆ４ = 2.298
(２) ｎ４ＳＮ−ｎ４ＳＰ = 0.117
(３) ν４ＳＮ−ν４ＳＰ = 13.16
(４) ｎ４ＶＰ−ｎ４ＶＮ = 0.121
(５) ν４ＶＮ−ν４ＶＰ = 22.26
(６)（−ｆ２）／ｆ１ = 0.153
(７) ｆ３／ｆｗ = 1.239
(８)（−ｆ４）／ｆｗ = 1.164
(９) ｆ５／ｆｗ = 1.732
Table 2 below provides values of specifications of the variable magnification optical system according to the present example.
[Table 2]
[Surface data]
Surface number rd nd νd
Object ∞
1 191.1156 2.000 1.80518 25.45
2 82.9848 7.200 1.58913 61.22
3 -355.4078 0.100
4 61.7520 4.857 1.60311 60.69
5 155.9275 Variable
6 * 400.0000 0.150 1.55389 38.23
7 303.1666 1.200 1.80610 40.97
8 14.4476 6.037
9 -51.6369 1.000 1.80610 40.97
10 52.4492 0.300
11 29.1080 5.549 1.84666 23.78
12 -35.6410 0.263
13 -33.7318 1.000 1.80610 40.97
14 241.7240 Variable
15 (Aperture) ∞ 0.400
16 52.0289 3.076 1.51680 63.88
17 -28.2824 0.100
18 25.2614 3.638 1.59319 67.90
19 -26.4079 1.000 1.84666 23.78
20 -641.6391 Variable
21 -68.1715 1.000 1.72916 54.61
22 13.3598 2.769 1.85026 32.35
23 37.4710 2.400
24 -66.3717 3.119 1.71736 29.57
25 -13.6861 1.000 1.83481 42.73
26 1321.2398 Variable
27 -401.8684 4.776 1.58913 61.22
28 -20.3408 0.100
29 64.3720 7.000 1.48749 70.31
30 -16.7736 1.300 1.90366 31.27
31 -44.5828 BF
Image plane ∞
[Aspherical data]
6th page
κ = 5.0810
A4 = 6.73638E-06
A6 = -2.66929E-08
A8 = 9.66840E-11
A10 = -1.93090E-13
[Various data]
Scaling ratio 7.35
WMT
f 18.5 70.0 136.0
FNO 3.48 5.13 5.87
2ω 78.08 22.18 11.60
Ymax 14.25 14.25 14.25
TL 142.31 176.13 196.21
BF 38.12 58.06 66.92
[Variable interval data]
WMTWMT
Infinity infinity infinity infinity short distance short distance short distance
d5 2.500 37.986 55.283 1.832 37.390 54.324
d14 30.329 8.711 2.636 30.996 9.307 3.595
d20 2.500 7.522 8.804 2.500 7.522 8.804
d26 7.534 2.512 1.230 7.534 2.512 1.230
[Lens group data]
Group start surface f
1 1 108.265
2 6 -16.603
3 16 22.924
4 21 -21.530
5 27 32.038
[Conditional expression values]
(1) f4S / f4 = 2.298
(2) n4SN-n4SP = 0.117
(3) ν4SN-ν4SP = 13.16
(4) n4VP-n4VN = 0.121
(5) ν4VN−ν4VP = 22.26
(6) (−f2) /f1=0.153
(7) f3 / fw = 1.239
(8) (−f4) /fw=1.164
(9) f5 / fw = 1.732
図７（ａ）、及び図７（ｂ）はそれぞれ、第２実施例に係る変倍光学系の広角端状態における無限遠合焦時の諸収差図、及び０．６０°の回転ブレに対してブレ補正を行った際のメリディオナル横収差図である。 FIGS. 7A and 7B are graphs showing various aberrations at the time of focusing at infinity in the wide-angle end state of the zoom optical system according to the second example and a rotational blur of 0.60 °, respectively. FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
図８は、第２実施例に係る変倍光学系の中間焦点距離状態における無限遠合焦時の諸収差図である。 FIG. 8 is a diagram of various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the second example.
図９（ａ）、及び図９（ｂ）はそれぞれ、第２実施例に係る変倍光学系の望遠端状態における無限遠合焦時の諸収差図、及び０．２０°の回転ブレに対してブレ補正を行った際のメリディオナル横収差図である。 FIGS. 9A and 9B are graphs showing various aberrations at the time of focusing on infinity in the telephoto end state of the variable magnification optical system according to the second example, and a rotational blur of 0.20 °, respectively. FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
図１０（ａ）、図１０（ｂ）、及び図１０（ｃ）はそれぞれ、第２実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離合焦時の諸収差図である。 10 (a), 10 (b), and 10 (c), respectively, are in close focus at the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the second example. FIG.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離合焦時、手ブレ等による結像位置変位の補正時にも優れた結像性能を有していることがわかる。 From the various aberration diagrams, the variable magnification optical system according to the present example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the imaging position displacement due to camera shake or the like is corrected.
上記各実施例によれば、手ブレ等による結像位置変位補正時においても良好な光学性能を備えた変倍光学系を実現することができる。 According to each of the above embodiments, it is possible to realize a variable magnification optical system having good optical performance even when the imaging position displacement is corrected by camera shake or the like.
なお、上記各実施例は本願発明の一具体例を示しているものであり、本願発明はこれらに限定されるものではない。以下の内容は、本願の変倍光学系の光学性能を損なわない範囲で適宜採用することが可能である。 In addition, each said Example has shown one specific example of this invention, and this invention is not limited to these. The following contents can be adopted as appropriate as long as the optical performance of the variable magnification optical system of the present application is not impaired.
本願の変倍光学系の数値実施例として５群構成のものを示したが、本願はこれに限られず、その他の群構成（例えば、６群、７群等）の変倍光学系を構成することもできる。具体的には、本願の変倍光学系の最も物体側や最も像面側にレンズ又はレンズ群を追加した構成でも構わない。なお、レンズ群とは、変倍時に変化する空気間隔で分離された、少なくとも１枚のレンズを有する部分を示す。 A numerical example of the variable magnification optical system of the present application is shown as having a five-group configuration, but the present application is not limited to this, and constitutes a variable magnification optical system of other group configurations (for example, six groups, seven groups, etc.). You can also Specifically, a configuration in which a lens or a lens group is added to the most object side or the most image plane side of the variable magnification optical system of the present application may be used. The lens group refers to a portion having at least one lens separated by an air interval that changes during zooming.
また、本願の変倍光学系は、無限遠物点から近距離物点への合焦を行うために、レンズ群の一部、１つのレンズ群全体、或いは複数のレンズ群を合焦レンズ群として光軸方向へ移動させる構成としてもよい。特に、第２レンズ群の少なくとも一部を合焦レンズ群とすることが好ましい。また、斯かる合焦レンズ群は、オートフォーカスに適用することも可能であり、オートフォーカス用のモータ、例えば超音波モータ等による駆動にも適している。 In addition, the variable magnification optical system of the present application includes a part of a lens group, an entire lens group, or a plurality of lens groups for focusing from an infinite object point to a short-distance object point. It is good also as a structure moved to an optical axis direction. In particular, it is preferable that at least a part of the second lens group is a focusing lens group. Such a focusing lens group can also be applied to autofocus, and is also suitable for driving by an autofocus motor, such as an ultrasonic motor.
また、本願の変倍光学系において、第４レンズ群の一部を、防振レンズ群として光軸に垂直な成分を含むように移動させ、又は光軸を含む面内方向へ回転移動（揺動）させることで、手ブレ等によって生じる像ブレを補正する構成とすることができる。 Further, in the variable magnification optical system of the present application, a part of the fourth lens group is moved so as to include a component perpendicular to the optical axis as an anti-vibration lens group, or rotationally moved (swinged) in an in-plane direction including the optical axis. The image blur caused by camera shake or the like can be corrected.
また、本願の変倍光学系を構成するレンズのレンズ面は、球面又は平面としてもよく、或いは非球面としてもよい。レンズ面が球面又は平面の場合、レンズ加工及び組立調整が容易になり、レンズ加工及び組立調整の誤差による光学性能の劣化を防ぐことができるため好ましい。また、像面がずれた場合でも描写性能の劣化が少ないため好ましい。レンズ面が非球面の場合、研削加工による非球面、ガラスを型で非球面形状に成型したガラスモールド非球面、又はガラス表面に設けた樹脂を非球面形状に形成した複合型非球面のいずれでもよい。また、レンズ面は回折面としてもよく、レンズを屈折率分布型レンズ（ＧＲＩＮレンズ）或いはプラスチックレンズとしてもよい。 The lens surface of the lens constituting the variable magnification optical system of the present application may be a spherical surface, a flat surface, or an aspheric surface. When the lens surface is a spherical surface or a flat surface, it is preferable because lens processing and assembly adjustment are easy, and deterioration of optical performance due to errors in lens processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance. When the lens surface is aspherical, any of aspherical surface by grinding, glass mold aspherical surface in which glass is molded into an aspherical shape, or composite aspherical surface in which resin provided on the glass surface is formed in an aspherical shape Good. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
また、本願の変倍光学系において開口絞りは第３レンズ群近傍に配置されることが好ましいが、開口絞りとして部材を設けずにレンズ枠でその役割を代用する構成としてもよい。 In the variable magnification optical system of the present application, the aperture stop is preferably disposed in the vicinity of the third lens group. However, a lens frame may be used as a substitute for the aperture stop without providing a member.
また、本願の変倍光学系を構成するレンズのレンズ面に、広い波長域で高い透過率を有する反射防止膜を施してもよい。これにより、フレアやゴーストを軽減し、高コントラストの高い光学性能を達成することができる。 Further, an antireflection film having a high transmittance in a wide wavelength range may be applied to the lens surface of the lens constituting the variable magnification optical system of the present application. Thereby, flare and ghost can be reduced, and high optical performance with high contrast can be achieved.
次に、本願の変倍光学系を備えたカメラを図１１に基づいて説明する。図１１は、本願の変倍光学系を備えたカメラの構成を示す図である。 Next, a camera including the variable magnification optical system of the present application will be described with reference to FIG. FIG. 11 is a diagram illustrating a configuration of a camera including the variable magnification optical system of the present application.
本カメラ１は、図１１に示すように撮影レンズ２として上記第１実施例に係る変倍光学系を備えたレンズ交換式の所謂ミラーレスカメラである。
The
本カメラ１において、不図示の物体（被写体）からの光は、撮影レンズ２で集光されて、不図示のＯＬＰＦ（Optical low pass filter：光学ローパスフィルタ）を介して撮影部３の撮像面上に被写体像を形成する。そして、撮影部３に設けられた光電変換素子により被写体像が光電変換されて被写体の画像が生成される。この画像は、カメラ１に設けられたＥＶＦ（Electronic view finder：電子ビューファインダ）４に表示される。これにより撮影者は、ＥＶＦ４を介して被写体を観察することができる。
In the
また、撮影者によって不図示のレリーズボタンが押されると、撮影部３により光電変換された画像が不図示のメモリに記憶される。このようにして、撮影者は本カメラ１による被写体の撮影を行うことができる。
Further, when a release button (not shown) is pressed by the photographer, an image photoelectrically converted by the
以上の構成により、上記第１実施例に係る変倍光学系を撮影レンズ２として搭載した本カメラ１は、手ブレ等による結像位置変位の補正時においても良好な光学性能を実現することができる。なお、上記第２実施例に係る変倍光学系を撮影レンズ２として搭載したカメラを構成しても上記カメラ１と同様の効果を奏することができる。
With the above configuration, the
以下、本願の変倍光学系の製造方法の概略を図１２に基づいて説明する。 Hereinafter, the outline of the manufacturing method of the variable magnification optical system of this application is demonstrated based on FIG.
図１２に示す本願の変倍光学系の製造方法は、光軸に沿って物体側から順に、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、正の屈折力を有する第３レンズ群と、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とを有する変倍光学系の製造方法であって、以下のステップＳ１ないしＳ４を含むものである。
ステップＳ１：広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小するようにする。
ステップＳ２：前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有するようにする。
ステップＳ３：前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有するようにする。
ステップＳ４：前記固定レンズ部分の焦点距離をｆ４Ｓとし、前記第４レンズ群の焦点距離をｆ４としたときに、以下の条件式（１）を満足するようにする。
（１） １．５０＜ｆ４Ｓ／ｆ４＜２．７０
The manufacturing method of the variable magnification optical system of the present application shown in FIG. 12 includes, in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, And a fourth lens group having negative refracting power and a fifth lens group having positive refracting power. Includes S1 to S4.
Step S1: At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group is increased, and the second lens group And the distance between the third lens group is reduced, the distance between the third lens group and the fourth lens group is increased, and the distance between the fourth lens group and the fifth lens group is reduced.
Step S2: The fourth lens group has a vibration-proof lens portion that can move in a direction that includes a direction component orthogonal to the optical axis, and movement in the direction that includes a direction component orthogonal to the optical axis is restricted during the movement. A fixed lens portion.
Step S3: The fixed lens portion has a positive lens component and a negative lens component.
Step S4: When the focal length of the fixed lens portion is f4S and the focal length of the fourth lens group is f4, the following conditional expression (1) is satisfied.
(1) 1.50 <f4S / f4 <2.70
以上の製造方法によれば、手ブレ等による結像位置変位の補正時においても良好な光学性能を備えた変倍光学系を製造することができる。 According to the above manufacturing method, it is possible to manufacture a variable magnification optical system having a good optical performance even when the imaging position displacement due to camera shake or the like is corrected.
Ｇ１ 第１レンズ群
Ｇ２ 第２レンズ群
Ｇ３ 第３レンズ群
Ｇ４ 第４レンズ群
Ｇ５ 第５レンズ群
Ｇ４Ｆ 防振レンズ部分
Ｇ４Ｒ 固定レンズ部分
Ｉ 像面
Ｓ 開口絞り
１ カメラ
２ 撮影レンズ
３ 撮影部
４ ＥＶＦ
G1 first lens group
G2 second lens group
G3 Third lens group
G4 4th lens group
G5 5th lens group
G4F Anti-vibration lens part G4R Fixed lens part I Image surface
S Aperture stop
1
Claims (15)
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、前記防振レンズ部分よりも像側に配置され、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、
前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有し、
以下の条件式を満足することを特徴とする変倍光学系。
１．５０＜ｆ４Ｓ／ｆ４＜２．４０
０．１３＜（−ｆ２）／ｆ１＜０．１９
ただし、
ｆ４Ｓ：前記固定レンズ部分の焦点距離
ｆ４ ：前記第４レンズ群の焦点距離
ｆ２ ：前記第２レンズ群の焦点距離
ｆ１ ：前記第１レンズ群の焦点距離 A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative refractive power in order from the object side along the optical axis. Substantially consisting of five lens groups, a fourth lens group having a positive refractive power and a fifth lens group having a positive refractive power,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between the three lens groups is reduced, an interval between the third lens group and the fourth lens group is enlarged, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes a vibration-proof lens portion movable in a direction including a direction component orthogonal to the optical axis, and a direction component orthogonal to the optical axis at the time of the movement. A fixed lens portion that is restricted from moving in a direction including
The fixed lens portion has a positive lens component and a negative lens component;
A zoom optical system characterized by satisfying the following conditional expression:
1.50 <f4S / f4 <2.40
0.13 <(− f2) / f1 <0.19
However,
f4S: focal length of the fixed lens portion f4: focal length of the fourth lens group f2: focal length of the second lens group f1: focal length of the first lens group
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、前記防振レンズ部分よりも像側に配置され、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、
前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有し、
以下の条件式を満足することを特徴とする変倍光学系。
１．５０＜ｆ４Ｓ／ｆ４＜２．４０
０．６０＜（−ｆ４）／ｆｗ＜１．４０
ただし、
ｆ４Ｓ：前記固定レンズ部分の焦点距離
ｆ４ ：前記第４レンズ群の焦点距離
ｆｗ：広角端状態における全系の焦点距離 A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative refractive power in order from the object side along the optical axis. Substantially consisting of five lens groups, a fourth lens group having a positive refractive power and a fifth lens group having a positive refractive power,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between the three lens groups is reduced, an interval between the third lens group and the fourth lens group is enlarged, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes a vibration-proof lens portion movable in a direction including a direction component orthogonal to the optical axis, and a direction component orthogonal to the optical axis at the time of the movement. A fixed lens portion that is restricted from moving in a direction including
The fixed lens portion has a positive lens component and a negative lens component;
A zoom optical system characterized by satisfying the following conditional expression:
1.50 <f4S / f4 <2.40
0.60 <(− f4) / fw <1.40
However,
f4S: focal length of the fixed lens portion f4: focal length of the fourth lens group fw: focal length of the entire system in the wide-angle end state
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、
前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有し、
以下の条件式を満足することを特徴とする変倍光学系。
１．９０＜ｆ４Ｓ／ｆ４＜２．４０
０．１３＜（−ｆ２）／ｆ１＜０．１９
ただし、
ｆ４Ｓ：前記固定レンズ部分の焦点距離
ｆ４ ：前記第４レンズ群の焦点距離
ｆ２ ：前記第２レンズ群の焦点距離
ｆ１ ：前記第１レンズ群の焦点距離 A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative refractive power in order from the object side along the optical axis. Substantially consisting of five lens groups, a fourth lens group having a positive refractive power and a fifth lens group having a positive refractive power,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between the three lens groups is reduced, an interval between the third lens group and the fourth lens group is enlarged, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes an anti-vibration lens portion that can move in a direction that includes a direction component orthogonal to the optical axis, and a fixed lens portion that is restricted from moving in a direction that includes a direction component orthogonal to the optical axis during the movement. And
The fixed lens portion has a positive lens component and a negative lens component;
A zoom optical system characterized by satisfying the following conditional expression:
1.90 <f4S / f4 <2.40
0.13 <(− f2) / f1 <0.19
However,
f4S: focal length of the fixed lens portion f4: focal length of the fourth lens group f2: focal length of the second lens group f1: focal length of the first lens group
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、
前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有し、
以下の条件式を満足することを特徴とする変倍光学系。
１．９０＜ｆ４Ｓ／ｆ４＜２．４０
０．６０＜（−ｆ４）／ｆｗ＜１．４０
ただし、
ｆ４Ｓ：前記固定レンズ部分の焦点距離
ｆ４ ：前記第４レンズ群の焦点距離
ｆｗ：広角端状態における全系の焦点距離 A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative refractive power in order from the object side along the optical axis. Substantially consisting of five lens groups, a fourth lens group having a positive refractive power and a fifth lens group having a positive refractive power,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between the three lens groups is reduced, an interval between the third lens group and the fourth lens group is enlarged, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes an anti-vibration lens portion that can move in a direction that includes a direction component orthogonal to the optical axis, and a fixed lens portion that is restricted from moving in a direction that includes a direction component orthogonal to the optical axis during the movement. And
The fixed lens portion has a positive lens component and a negative lens component;
A zoom optical system characterized by satisfying the following conditional expression:
1.90 <f4S / f4 <2.40
0.60 <(− f4) / fw <1.40
However,
f4S: focal length of the fixed lens portion f4: focal length of the fourth lens group fw: focal length of the entire system in the wide-angle end state
広角端状態から望遠端状態への変倍時に、前記第１レンズ群が物体側に移動し、前記第１レンズ群と前記第２レンズ群の間隔が拡大し、前記第２レンズ群と前記第３レンズ群の間隔が縮小し、前記第３レンズ群と前記第４レンズ群の間隔が拡大し、前記第４レンズ群と前記第５レンズ群の間隔が縮小し、
前記第４レンズ群は、光軸と直交する方向成分を含む方向へ移動可能な防振レンズ部分と、該移動時に光軸と直交する方向成分を含む方向への移動が制限される固定レンズ部分とを有し、
前記固定レンズ部分は、正レンズ成分と、負レンズ成分とを有し、
前記防振レンズ部分は、正レンズと負レンズとの接合レンズからなり、
前記正レンズは、物体側に凸面を向けた正メニスカスレンズであり、
前記負レンズは、両凹形状の負レンズであり、
以下の条件式を満足することを特徴とする変倍光学系。
１．５０＜ｆ４Ｓ／ｆ４＜２．７０
ただし、
ｆ４Ｓ：前記固定レンズ部分の焦点距離
ｆ４ ：前記第４レンズ群の焦点距離 A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative refractive power in order from the object side along the optical axis. Substantially consisting of five lens groups, a fourth lens group having a positive refractive power and a fifth lens group having a positive refractive power,
At the time of zooming from the wide-angle end state to the telephoto end state, the first lens group moves toward the object side, the distance between the first lens group and the second lens group increases, and the second lens group and the second lens group An interval between the three lens groups is reduced, an interval between the third lens group and the fourth lens group is enlarged, and an interval between the fourth lens group and the fifth lens group is reduced;
The fourth lens group includes an anti-vibration lens portion that can move in a direction that includes a direction component orthogonal to the optical axis, and a fixed lens portion that is restricted from moving in a direction that includes a direction component orthogonal to the optical axis during the movement. And
The fixed lens portion has a positive lens component and a negative lens component;
The anti-vibration lens part consists of a cemented lens of a positive lens and a negative lens,
The positive lens is a positive meniscus lens having a convex surface facing the object side,
The negative lens is a biconcave negative lens,
A zoom optical system characterized by satisfying the following conditional expression:
1.50 <f4S / f4 <2.70
However,
f4S: focal length of the fixed lens portion f4: focal length of the fourth lens group
０．１１＜（−ｆ２）／ｆ１＜０．１９
ただし、
ｆ２：前記第２レンズ群の焦点距離
ｆ１：前記第１レンズ群の焦点距離 6. The variable magnification optical system according to claim 5, wherein the following conditional expression is satisfied.
0.11 <(− f2) / f1 <0.19
However,
f2: focal length of the second lens group f1: focal length of the first lens group
０．６０＜（−ｆ４）／ｆｗ＜１．６０
ただし、
ｆ４：前記第４レンズ群の焦点距離
ｆｗ：広角端状態における全系の焦点距離 The zoom lens system according to claim 5 or 6, wherein the following conditional expression is satisfied.
0.60 <(− f4) / fw <1.60
However,
f4: focal length of the fourth lens group fw: focal length of the entire system in the wide-angle end state
前記負レンズは、両凹形状の負レンズであることを特徴とする請求項８に記載の変倍光学系。 The positive lens is a positive meniscus lens having a convex surface facing the object side,
The variable magnification optical system according to claim 8, wherein the negative lens is a biconcave negative lens.
０．００＜ｎ４ＶＰ−ｎ４ＶＮ＜０．２０
ただし、
ｎ４ＶＰ：前記正レンズの屈折率
ｎ４ＶＮ：前記負レンズの屈折率 The zoom lens system according to any one of claims 5 to 9, wherein the following conditional expression is satisfied.
0.00 <n4VP-n4VN <0.20
However,
n4VP: refractive index of the positive lens n4VN: refractive index of the negative lens
０．１１＜（−ｆ２）／ｆ１＜０．１９
ただし、
ｆ２：前記第２レンズ群の焦点距離
ｆ１：前記第１レンズ群の焦点距離 The zoom lens system according to any one of claims 5 to 10, wherein the following conditional expression is satisfied.
0.11 <(− f2) / f1 <0.19
However,
f2: focal length of the second lens group f1: focal length of the first lens group
０．７０＜ｆ３／ｆｗ＜１．８０
ただし、
ｆ３：前記第３レンズ群の焦点距離
ｆｗ：広角端状態における全系の焦点距離 The zoom lens system according to any one of claims 1 to 11, wherein the following conditional expression is satisfied.
0.70 <f3 / fw <1.80
However,
f3: focal length of the third lens unit fw: focal length of the entire system in the wide-angle end state
１．００＜ｆ５／ｆｗ＜２．３０
ただし、
ｆ５：前記第５レンズ群の焦点距離
ｆｗ：広角端状態における全系の焦点距離 The variable magnification optical system according to any one of claims 1 to 12, wherein the following conditional expression is satisfied.
1.00 <f5 / fw <2.30
However,
f5: focal length of the fifth lens group fw: focal length of the entire system in the wide-angle end state
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