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JP6398292B2 - Variable-magnification optical system, optical device, and variable-magnification optical system manufacturing method - Google Patents

Variable-magnification optical system, optical device, and variable-magnification optical system manufacturing method Download PDF

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JP6398292B2
JP6398292B2 JP2014091862A JP2014091862A JP6398292B2 JP 6398292 B2 JP6398292 B2 JP 6398292B2 JP 2014091862 A JP2014091862 A JP 2014091862A JP 2014091862 A JP2014091862 A JP 2014091862A JP 6398292 B2 JP6398292 B2 JP 6398292B2
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lens group
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optical system
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JP2015210384A (en
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知之 幸島
知之 幸島
昭彦 小濱
昭彦 小濱
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Nikon Corp
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Priority to PCT/JP2015/062242 priority patent/WO2015163368A1/en
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Priority to CN201580033009.5A priority patent/CN106461922B/en
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Description

本発明は、変倍光学系、光学装置、変倍光学系の製造方法に関する。   The present invention relates to a variable magnification optical system, an optical apparatus, and a method for manufacturing the variable magnification optical system.

従来、カメラ用の交換レンズ、デジタルカメラ、ビデオカメラ等に好適な変倍光学系として、最も物体側のレンズ群が正の屈折力を有するものが数多く提案されているが、これらの変倍光学系のうち、一部のレンズ群を光軸に沿って移動させることで無限遠物体から近距離物体への合焦を行なうことができる光学系が提案されている。(例えば、特許文献1を参照。)。   Conventionally, as a variable power optical system suitable for an interchangeable lens for a camera, a digital camera, a video camera, etc., many lenses having a positive refractive power in the most object side lens group have been proposed. Among the systems, there has been proposed an optical system capable of focusing from an infinitely distant object to a close object by moving some lens groups along the optical axis. (For example, see Patent Document 1).

特開2009−251118号公報JP 2009-251118 A

しかしながら、上述のような従来の変倍光学系は、高変倍比を維持しながら小型化しようとすると、無限遠物体から近距離物体への合焦時に、充分に高い光学性能を得ることが困難であるという問題があった。   However, the conventional variable power optical system as described above can obtain sufficiently high optical performance at the time of focusing from an object at infinity to a close object when trying to reduce the size while maintaining a high zoom ratio. There was a problem that it was difficult.

本発明は、上記問題点に鑑みてなされたものであり、高変倍比を有し、小型で、無限遠物体から近距離物体への合焦時に高い光学性能を有する変倍光学系、光学装置、変倍光学系の製造方法を提供することを目的とする。   The present invention has been made in view of the above problems, has a high zoom ratio, is small, and has a high optical performance at the time of focusing from an object at infinity to a short distance object. An object of the present invention is to provide an apparatus and a method for manufacturing a variable magnification optical system.

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、正屈折力の第1レンズ群と、負屈折力の第2レンズ群と、正屈折力の第3レンズ群と、正屈折力の第4レンズ群と、第5レンズ群とにより実質的に5個のレンズ群からなり、開口絞りを有し、広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔とが変化し、前記第5レンズ群は像面に対して移動し、前記開口絞りと前記第4レンズ群との距離が不変であり、無限遠物体から近距離物体への合焦時に、前記第3レンズ群は光軸に沿って移動し、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。
2.970 < f3/fw < 10.000
2.700 < (d1it−d1iw)/fw < 10.000
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3レンズ群の焦点距離
d1it:望遠端状態における前記第1レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d1iw:広角端状態における前記第1レンズ群の最も像側のレンズ面から像面までの光軸上の距離
また、本発明は、光軸に沿って物体側から順に、正屈折力の第1レンズ群と、負屈折力の第2レンズ群と、正屈折力の第3レンズ群と、正屈折力の第4レンズ群と、第5レンズ群とにより実質的に5個のレンズ群からなり、開口絞りを有し、広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔とが変化し、前記第5レンズ群は像面に対して移動し、前記開口絞りと前記第4レンズ群との距離が不変であり、無限遠物体から近距離物体への合焦時に、前記第3レンズ群は光軸に沿って移動し、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。
2.970 < f3/fw < 10.000
0.300 < f3/f4 < 1.500
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3レンズ群の焦点距離
f4:前記第4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、正屈折力の第1レンズ群と、負屈折力の第2レンズ群と、正屈折力の第3レンズ群と、正屈折力の第4レンズ群と、第5レンズ群とにより実質的に5個のレンズ群からなり、開口絞りを有し、広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔とが変化し、前記第5レンズ群は像面に対して移動し、前記開口絞りと前記第4レンズ群との距離が不変であり、無限遠物体から近距離物体への合焦時に、前記第3レンズ群は光軸に沿って移動し、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。
3.592 ≦ f3/fw < 10.000
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3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、正屈折力の第1レンズ群と、負屈折力の第2レンズ群と、正屈折力の第3レンズ群と、正屈折力の第4レンズ群と、第5レンズ群とにより実質的に5個のレンズ群からなり、開口絞りを有し、広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔とが変化し、前記第5レンズ群は像面に対して移動し、前記開口絞りと前記第4レンズ群との距離が不変であり、無限遠物体から近距離物体への合焦時に、前記第3レンズ群は光軸に沿って移動し、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。
2.970 < f3/fw < 10.000
0.010 <(d5it−d5iw)/(d3it−d3iw)< 1.000
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3レンズ群の焦点距離
d3it:望遠端状態における前記第3レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d3iw:広角端状態における前記第3レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d5it:望遠端状態における前記第5レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d5iw:広角端状態における前記第5レンズ群の最も像側のレンズ面から像面までの光軸上の距離
In order to solve the above-described problems, the present invention provides a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power in order from the object side along the optical axis. And a fourth lens group having positive refracting power and a fifth lens group, and substantially including five lens groups, having an aperture stop, and at the time of zooming from the wide-angle end state to the telephoto end state, A distance between one lens group and the second lens group, a distance between the second lens group and the third lens group, a distance between the third lens group and the fourth lens group, and the fourth lens. The distance between the first lens group and the fifth lens group changes, the fifth lens group moves with respect to the image plane, the distance between the aperture stop and the fourth lens group remains unchanged, and The third lens group moves along the optical axis when focusing on an object at a short distance, and satisfies the following conditional expression: To provide a variable magnification optical system that.
2.970 <f3 / fw <10.000
2.700 <(d1it-d1iw) / fw <10.000
However,
fw: focal length of the entire zoom optical system in the wide-angle end state f3: focal length of the third lens group
d1it: distance on the optical axis from the lens surface closest to the image side of the first lens group in the telephoto end state to the image surface
d1iw: Distance on the optical axis from the lens surface closest to the image side of the first lens group in the wide-angle end state to the image plane
Further, according to the present invention, 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, a third lens group having a positive refractive power, and a positive refractive power. The fourth lens group and the fifth lens group substantially comprise five lens groups, have an aperture stop, and at the time of zooming from the wide-angle end state to the telephoto end state, the first lens group and the first lens group The distance between the second lens group, the distance between the second lens group and the third lens group, the distance between the third lens group and the fourth lens group, the fourth lens group and the fifth lens. The distance between the aperture stop and the fourth lens group is unchanged, and the distance from the infinite object to the close object is changed. Provided a variable magnification optical system characterized in that the third lens group moves along the optical axis during focusing and satisfies the following conditional expression: That.
2.970 <f3 / fw <10.000
0.300 <f3 / f4 <1.500
However,
fw: focal length of the entire system of the variable magnification optical system in the wide-angle end state
f3: focal length of the third lens group
f4: focal length of the fourth lens group
Further, according to the present invention, 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, a third lens group having a positive refractive power, and a positive refractive power. The fourth lens group and the fifth lens group substantially comprise five lens groups, have an aperture stop, and at the time of zooming from the wide-angle end state to the telephoto end state, the first lens group and the first lens group The distance between the second lens group, the distance between the second lens group and the third lens group, the distance between the third lens group and the fourth lens group, the fourth lens group and the fifth lens. The distance between the aperture stop and the fourth lens group is unchanged, and the distance from the infinite object to the close object is changed. Provided a variable magnification optical system characterized in that the third lens group moves along the optical axis during focusing and satisfies the following conditional expression: That.
3.592 ≦ f3 / fw <10.000
However,
fw: focal length of the entire system of the variable magnification optical system in the wide-angle end state
f3: focal length of the third lens group
Further, according to the present invention, 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, a third lens group having a positive refractive power, and a positive refractive power. The fourth lens group and the fifth lens group substantially comprise five lens groups, have an aperture stop, and at the time of zooming from the wide-angle end state to the telephoto end state, the first lens group and the first lens group The distance between the second lens group, the distance between the second lens group and the third lens group, the distance between the third lens group and the fourth lens group, the fourth lens group and the fifth lens. The distance between the aperture stop and the fourth lens group is unchanged, and the distance from the infinite object to the close object is changed. Provided a variable magnification optical system characterized in that the third lens group moves along the optical axis during focusing and satisfies the following conditional expression: That.
2.970 <f3 / fw <10.000
0.010 <(d5it-d5iw) / (d3it-d3iw) <1.00
However,
fw: focal length of the entire system of the variable magnification optical system in the wide-angle end state
f3: focal length of the third lens group
d3it: the distance on the optical axis from the most image side lens surface of the third lens group to the image surface in the telephoto end state
d3iw: distance on the optical axis from the lens surface closest to the image side of the third lens group in the wide-angle end state to the image surface
d5it: distance on the optical axis from the most image side lens surface of the fifth lens group to the image surface in the telephoto end state
d5iw: Distance on the optical axis from the lens surface closest to the image side of the fifth lens group in the wide-angle end state to the image surface

また、本発明は、前記変倍光学系を有することを特徴とする光学装置を提供する。   The present invention also provides an optical apparatus comprising the variable magnification optical system.

本発明によれば、高変倍比を有し、小型で、無限遠物体から近距離物体への合焦時に高い光学性能を有する変倍光学系、光学装置、変倍光学系の製造方法を提供することができる。   According to the present invention, there is provided a variable magnification optical system, an optical apparatus, and a variable magnification optical system manufacturing method having a high zoom ratio, a small size, and high optical performance when focusing from an object at infinity to a short distance object. Can be provided.

(a)、(b)、及び(c)はそれぞれ、本願の第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、及び望遠端状態における断面図である。(A), (b), and (c) are sectional views in the wide-angle end state, intermediate focal length state, and telephoto end state, respectively, of the variable magnification optical system according to the first example of the present application. (a)、(b)、及び(c)はそれぞれ、本願の第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、及び望遠端状態における無限遠物体合焦時の諸収差図である。(A), (b), and (c) are various figures at the time of focusing on an object at infinity 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 of the present application, respectively. It is an aberration diagram. (a)、(b)、及び(c)はそれぞれ、本願の第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、及び望遠端状態における近距離物体合焦時(撮影倍率-0.0100倍)の諸収差図である。(A), (b), and (c) are respectively when a short-distance object is focused in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the first example of the present application (shooting). FIG. 6 is a diagram showing various aberrations at a magnification of −0.0100. (a)、(b)、及び(c)はそれぞれ、本願の第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、及び望遠端状態における断面図である。(A), (b), and (c) are sectional views of the variable magnification optical system according to the second example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. (a)、(b)、及び(c)はそれぞれ、本願の第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、及び望遠端状態における無限遠物体合焦時の諸収差図である。(A), (b), and (c) are various values at the time of focusing on an object at infinity 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 second example of the present application, respectively. It is an aberration diagram. (a)、(b)、及び(c)はそれぞれ、本願の第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、及び望遠端状態における近距離物体合焦時(撮影倍率-0.0100倍)の諸収差図である。(A), (b), and (c) are respectively when a short-distance object is focused in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the second example of the present application (shooting). FIG. 6 is a diagram showing various aberrations at a magnification of −0.0100. (a)、(b)、及び(c)はそれぞれ、本願の第3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、及び望遠端状態における断面図である。(A), (b), and (c) are sectional views of the variable magnification optical system according to the third example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. (a)、(b)、及び(c)はそれぞれ、本願の第3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、及び望遠端状態における無限遠物体合焦時の諸収差図である。(A), (b), and (c) are various values at the time of focusing on an object at infinity 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 third example of the present application, respectively. It is an aberration diagram. (a)、(b)、及び(c)はそれぞれ、本願の第3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、及び望遠端状態における近距離物体合焦時(撮影倍率-0.0100倍)の諸収差図である。(A), (b), and (c), respectively, when focusing on a short-distance object in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the third example of the present application (shooting) FIG. 6 is a diagram showing various aberrations at a magnification of −0.0100. (a)、(b)、及び(c)はそれぞれ、本願の第4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、及び望遠端状態における断面図である。(A), (b), and (c) are sectional views in the wide-angle end state, intermediate focal length state, and telephoto end state, respectively, of the variable magnification optical system according to the fourth example of the present application. (a)、(b)、及び(c)はそれぞれ、本願の第4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、及び望遠端状態における無限遠物体合焦時の諸収差図である。(A), (b), and (c) are various values at the time of focusing on an object at infinity 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 fourth example of the present application, respectively. It is an aberration diagram. (a)、(b)、及び(c)はそれぞれ、本願の第4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、及び望遠端状態における近距離物体合焦時(撮影倍率-0.0100倍)の諸収差図である。(A), (b), and (c) are respectively when a short-distance object is focused in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the fourth example of the present application (shooting). FIG. 6 is a diagram showing various aberrations at a magnification of −0.0100. 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。It is a figure which shows the structure of the camera provided with the variable magnification optical system of this application. 本願の変倍光学系の製造方法の概略を示す図である。It is a figure which shows the outline of the manufacturing method of the variable magnification optical system of this application.

以下、本願の変倍光学系、光学装置、及び変倍光学系の製造方法について説明する。
本願の変倍光学系は、光軸に沿って物体側から順に、正屈折力の第1レンズ群と、負屈折力の第2レンズ群と、正屈折力の第3レンズ群と、正屈折力の第4レンズ群と、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レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔とが変化し、前記第5レンズ群は像面に対して移動することを特徴としている。この構成により、本願の変倍光学系は、広角端状態から望遠端状態への変倍を実現し、変倍に伴う歪曲収差、非点収差、及び球面収差のそれぞれの変動を抑えることができる。
Hereinafter, a variable magnification optical system, an optical apparatus, and a method for manufacturing the variable magnification optical system of the present application will be described.
The variable magnification 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, a third lens group having a positive refractive power, and positive refraction. A power fourth lens group and a fifth lens group, and 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, and the second lens The distance between the third lens group and the third lens group, the distance between the third lens group and the fourth lens group, and the distance between the fourth lens group and the fifth lens group are changed. The lens group is characterized by moving relative to the image plane. With this configuration, the variable magnification optical system of the present application realizes variable magnification from the wide-angle end state to the telephoto end state, and can suppress each variation of distortion aberration, astigmatism, and spherical aberration associated with variable magnification. .

また、本願の変倍光学系は、無限遠物体から近距離物体への合焦を、第3レンズ群を光軸に沿って移動させる構成である。この構成により、望遠側の合焦時の移動量を抑え、光学系全系の全長を抑えて小型化できるようになり、加えて望遠側において合焦レンズ群である第3レンズ群に入射する光線の光軸からの高さの変動を抑え、合焦時における球面収差や非点収差の変動を抑えることができる。   The variable magnification optical system of the present application is configured to move the third lens group along the optical axis for focusing from an object at infinity to an object at a short distance. With this configuration, the amount of movement during focusing on the telephoto side can be reduced, the overall length of the entire optical system can be reduced, and the size can be reduced. In addition, the telephoto side is incident on the third lens group that is the focusing lens group. It is possible to suppress variations in the height of the light beam from the optical axis, and to suppress variations in spherical aberration and astigmatism during focusing.

また、本願の変倍光学系は、以下の条件式(1)を満足することを特徴としている。
(1) 2.970 < f3/fw < 10.000
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3レンズ群の焦点距離
The variable magnification optical system of the present application is characterized by satisfying the following conditional expression (1).
(1) 2.970 <f3 / fw <10.000
However,
fw: focal length of the entire zoom optical system in the wide-angle end state f3: focal length of the third lens group

条件式(1)は、第3レンズ群の適切な焦点距離範囲を規定するものである。本願の変倍光学系は、条件式(1)を満足することにより、広角端状態から望遠端状態への変倍時、及び無限遠物体から近距離物体への合焦時の球面収差や非点収差の変動を抑えることができる。
本願の変倍光学系の条件式(1)の対応値が下限値を下回ると、変倍時や合焦時に第3レンズ群で発生する球面収差や非点収差の変動を抑えることが困難となり、高い光学性能を実現できなくなってしまう。なお、本願の効果をより確実にするために、条件式(1)の下限値を3.300とすることがより好ましい。
一方、本願の変倍光学系の条件式(1)の対応値が上限値を上回ると、無限遠物体から近距離物体への合焦時の第3レンズ群の移動量が大きくなる。これにより、合焦時の第3レンズ群に入射する軸上光束と軸外光束の光軸からの高さが大きく変動するため、球面収差や非点収差の変動が大きくなり、高い光学性能を実現できなくなってしまう。なお、本願の効果をより確実にするために、条件式(1)の上限値を7.000とすることがより好ましい。
Conditional expression (1) defines an appropriate focal length range of the third lens group. The zooming optical system of the present application satisfies the conditional expression (1), so that spherical aberration and non-focusing at the time of zooming from the wide-angle end state to the telephoto end state, and focusing from an infinitely distant object to a short-distance object are prevented. Variations in point aberration can be suppressed.
If the corresponding value of the conditional expression (1) of the variable magnification optical system of the present application is below the lower limit value, it becomes difficult to suppress fluctuations in spherical aberration and astigmatism that occur in the third lens group at the time of zooming or focusing. It becomes impossible to realize high optical performance. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (1) to 3.300.
On the other hand, if the corresponding value of the conditional expression (1) of the variable magnification optical system of the present application exceeds the upper limit value, the amount of movement of the third lens group at the time of focusing from an infinite object to a close object increases. As a result, the height from the optical axis of the on-axis light beam and off-axis light beam incident on the third lens group at the time of focusing largely fluctuates, so that the variation in spherical aberration and astigmatism increases, and high optical performance is achieved. It will not be possible. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (1) to 7.000.

また、本願の変倍光学系は、広角端状態から望遠端状態への変倍時に、前記第1レンズ群が物体側へ移動することが望ましい。この構成により、変倍時に第1レンズ群を通過する軸外光束の光軸からの高さの変化を抑えることができ、第1レンズ群の外径を小さくできるだけでなく、変倍時に非点収差の変動を抑えることができる。   In the zoom optical system according to the present application, it is preferable that the first lens unit moves toward the object side when zooming from the wide-angle end state to the telephoto end state. With this configuration, it is possible to suppress a change in height from the optical axis of the off-axis light beam that passes through the first lens group at the time of zooming, and not only can the outer diameter of the first lens group be reduced, but also astigmatism at the time of zooming. Variations in aberrations can be suppressed.

また、本願の変倍光学系は、以下の条件式(2)を満足することが望ましい。
(2) 2.700 < (d1it−d1iw)/fw < 10.000
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
d1it:望遠端状態における前記第1レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d1iw:広角端状態における前記第1レンズ群の最も像側のレンズ面から像面までの光軸上の距離
Moreover, it is desirable that the variable magnification optical system of the present application satisfies the following conditional expression (2).
(2) 2.700 <(d1it-d1iw) / fw <10.000
However,
fw: focal length of the entire zooming optical system in the wide-angle end state d1it: distance on the optical axis from the lens surface closest to the image side of the first lens group in the telephoto end state to the image plane d1iw: wide-angle end state The distance on the optical axis from the most image-side lens surface of the first lens unit to the image surface

条件式(2)は、広角端状態から望遠端状態への変倍時における、第1レンズ群の最も像側のレンズ面から像面までの光軸上の距離変化の適切な範囲を規定するものである。本願の変倍光学系は、条件式(2)を満足することにより、広角端状態から望遠端状態への変倍時の球面収差や非点収差の変動を抑えることができる。
本願の変倍光学系の条件式(2)の対応値が下限値を下回ると、変倍時の第1レンズ群で発生する非点収差の変動を抑えることが困難となり、高い光学性能を実現できなくなってしまう。なお、本願の効果をより確実にするために、条件式(2)の下限値を3.900とすることがより好ましい。
一方、本願の変倍光学系の条件式(2)の対応値が上限値を上回ると、第1レンズ群から第2レンズ群へ入射する軸上光束の径が変倍に伴って大きく変化する。すると、変倍時に球面収差の変動が過大になり、高い光学性能を実現できなくなってしまう。なお、本願の効果をより確実にするために、条件式(2)の上限値を7.800とすることがより好ましい。
Conditional expression (2) defines an appropriate range of a change in distance on the optical axis from the lens surface closest to the image side of the first lens group to the image plane at the time of zooming from the wide-angle end state to the telephoto end state. Is. By satisfying conditional expression (2), the variable magnification optical system of the present application can suppress variations in spherical aberration and astigmatism during zooming from the wide-angle end state to the telephoto end state.
If the corresponding value of conditional expression (2) of the variable magnification optical system of the present application is below the lower limit value, it becomes difficult to suppress fluctuations in astigmatism occurring in the first lens group at the time of zooming, and high optical performance is realized. It becomes impossible. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (2) to 3.900.
On the other hand, when the corresponding value of the conditional expression (2) of the variable magnification optical system of the present application exceeds the upper limit value, the diameter of the axial light beam incident on the second lens group from the first lens group greatly changes with the magnification change. . Then, the variation of spherical aberration becomes excessive at the time of zooming, and high optical performance cannot be realized. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (2) to 7.800.

また、本願の変倍光学系は、以下の条件式(3)を満足することが望ましい。
(3) 0.010<(d5it−d5iw)/(d3it−d3iw)<1.000
但し、
d3it:望遠端状態における前記第3レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d3iw:広角端状態における前記第3レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d5it:望遠端状態における前記第5レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d5iw:広角端状態における前記第5レンズ群の最も像側のレンズ面から像面までの光軸上の距離
Further, it is desirable that the variable magnification optical system of the present application satisfies the following conditional expression (3).
(3) 0.010 <(d5it-d5iw) / (d3it-d3iw) <1.000
However,
d3it: Distance on the optical axis from the lens surface closest to the image side of the third lens group in the telephoto end state to the image plane d3iw: From the lens surface closest to the image side of the third lens group in the wide-angle end state to the image plane D5it: Distance on the optical axis from the lens surface closest to the image side of the fifth lens group in the telephoto end state to the image plane d5iw: Distance on the most image side of the fifth lens group in the wide-angle end state Distance on the optical axis from the lens surface to the image plane

条件式(3)は、広角端状態から望遠端状態への変倍時における、第3レンズ群の最も像側のレンズ面から像面までの光軸上の距離変化と、第5レンズ群の最も像側のレンズ面から像面までの光軸上の距離変化の比の適切な範囲を規定するものである。本願の変倍光学系は、条件式(3)を満足することにより、広角端状態から望遠端状態への変倍時に非点収差の変動や歪曲収差の変動を抑えることができる。
本願の変倍光学系の条件式(3)の対応値が下限値を下回ると、第4レンズ群から第5レンズ群へ入射する軸外光束の光軸からの高さが変倍に伴って大きく変化する。このため、変倍時に第5レンズ群で発生する非点収差の変動や歪曲収差の変動が過大になり、高い光学性能を実現できなくなってしまう。また、第5レンズ群へ入射する軸外光束の光軸からの高さが高くなり、第5レンズ群の径が大きくなる。なお、本願の効果をより確実にするために、条件式(3)の下限値を0.020とすることがより好ましい。
一方、本願の変倍光学系の条件式(3)の対応値が上限値を上回ると、変倍時に第3レンズ群で発生する非点収差の変動を第5レンズ群で抑えることが困難となり、高い光学性能を実現できなくなってしまう。なお、本願の効果をより確実にするために、条件式(3)の上限値を0.700とすることがより好ましい。
なお、高変倍を実現するために、広角端状態から望遠端状態への変倍時に、第3レンズ群の最も像側のレンズ面から像面までの光軸上の距離は大きくなる、すなわち条件式(3)の分母は正の値が好ましい。これにより、第3レンズ群で発生する非点収差の変動を抑えることができる。
Conditional expression (3) indicates that the change in distance on the optical axis from the lens surface closest to the image side of the third lens unit to the image plane at the time of zooming from the wide-angle end state to the telephoto end state, It defines an appropriate range of the ratio of the change in distance on the optical axis from the lens surface closest to the image side to the image surface. By satisfying conditional expression (3), the variable power optical system of the present application can suppress fluctuations in astigmatism and distortions during zooming from the wide-angle end state to the telephoto end state.
When the corresponding value of conditional expression (3) of the variable magnification optical system of the present application is below the lower limit value, the height from the optical axis of the off-axis light beam incident on the fifth lens group from the fourth lens group is accompanied by the variable power. It changes a lot. For this reason, fluctuations in astigmatism and distortion occurring in the fifth lens group during zooming become excessive, and high optical performance cannot be realized. Further, the height of the off-axis light beam incident on the fifth lens group from the optical axis increases, and the diameter of the fifth lens group increases. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (3) to 0.020.
On the other hand, if the corresponding value of conditional expression (3) of the variable magnification optical system of the present application exceeds the upper limit value, it becomes difficult to suppress astigmatism fluctuations that occur in the third lens group at the time of zooming in the fifth lens group. It becomes impossible to realize high optical performance. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (3) to 0.700.
In order to realize high zoom ratio, the distance on the optical axis from the lens surface closest to the image side of the third lens group to the image plane becomes large when zooming from the wide-angle end state to the telephoto end state. The denominator of conditional expression (3) is preferably a positive value. Thereby, the fluctuation of astigmatism occurring in the third lens group can be suppressed.

また、本願の変倍光学系は、以下の条件式(4)を満足することが望ましい。
(4) 0.300 < f3/f4 < 1.500
但し、
f3:前記第3レンズ群の焦点距離
f4:前記第4レンズ群の焦点距離
Moreover, it is desirable that the variable magnification optical system of the present application satisfies the following conditional expression (4).
(4) 0.300 <f3 / f4 <1.500
However,
f3: Focal length of the third lens group f4: Focal length of the fourth lens group

条件式(4)は、広角端状態から望遠端状態への変倍時における、第3レンズ群と第4レンズ群の適切な焦点距離比の範囲を規定するものである。本願の変倍光学系は、条件式(4)を満足することにより、広角端状態から望遠端状態への変倍時に球面収差や非点収差の変動を抑えることができる。
本願の変倍光学系の条件式(4)の対応値が下限値を下回ると、変倍時に第3レンズ群で発生する球面収差の変動や非点収差の変動を抑えることが困難になり、高い光学性能を実現できなくなってしまう。なお、本願の効果をより確実にするために、条件式(4)の下限値を0.600とすることがより好ましい。
一方、本願の変倍光学系の条件式(4)の対応値が上限値を上回ると、変倍時に第4レンズ群で発生する球面収差の変動や非点収差の変動を抑えることが困難になり、高い光学性能を実現できなくなってしまう。なお、本願の効果をより確実にするために、条件式(4)の上限値を1.250とすることがより好ましい。
Conditional expression (4) defines an appropriate focal length ratio range of the third lens group and the fourth lens group at the time of zooming from the wide-angle end state to the telephoto end state. By satisfying conditional expression (4), the variable magnification optical system of the present application can suppress variations in spherical aberration and astigmatism during zooming from the wide-angle end state to the telephoto end state.
If the corresponding value of conditional expression (4) of the variable magnification optical system of the present application is below the lower limit value, it becomes difficult to suppress variations in spherical aberration and astigmatism that occur in the third lens group during magnification, High optical performance cannot be realized. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (4) to 0.600.
On the other hand, if the corresponding value of conditional expression (4) of the variable magnification optical system of the present application exceeds the upper limit value, it is difficult to suppress the variation of spherical aberration and the astigmatism that occur in the fourth lens group at the time of zooming. Therefore, high optical performance cannot be realized. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (4) to 1.250.

また、本願の変倍光学系は開口絞りを有し、広角端状態から望遠端状態への変倍時に、開口絞りと前記第4レンズ群との距離が不変であることが望ましい。この構成により、広角端状態から望遠端状態への変倍時に、第4レンズ群に入射する軸外光束の光軸からの高さの変化を抑えることができ、変倍時に非点収差及び歪曲収差の変動を抑えることができる。   In addition, it is desirable that the zoom optical system of the present application has an aperture stop, and the distance between the aperture stop and the fourth lens group is not changed when zooming from the wide-angle end state to the telephoto end state. With this configuration, it is possible to suppress a change in the height of the off-axis light beam incident on the fourth lens unit from the optical axis during zooming from the wide-angle end state to the telephoto end state, and astigmatism and distortion during zooming. Variations in aberrations can be suppressed.

また、本願の変倍光学系は、無限遠物体から近距離物体への合焦時に、前記第3レンズ群が像側へ移動することが望ましい。本願の変倍光学系は、合焦時に第3レンズ群を像側へ移動させることで無限遠物体から近距離物体への合焦を効率的に行うことができ、球面収差や非点収差の変動を抑えることができる。   In the variable power optical system of the present application, it is desirable that the third lens group moves to the image side when focusing from an object at infinity to an object at a short distance. The variable magnification optical system of the present application can efficiently focus from an object at infinity to a close object by moving the third lens group to the image side during focusing, and can suppress spherical aberration and astigmatism. Variation can be suppressed.

また、本願の変倍光学系は、広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔が増加することが望ましい。この構成により、第2レンズ群の倍率を増倍することができ、高変倍比を効率的に実現し変倍時の球面収差の変動や非点収差の変動を抑えることができる。   In the zoom optical system of the present application, it is desirable that the distance between the first lens group and the second lens group is increased when zooming from the wide-angle end state to the telephoto end state. With this configuration, the magnification of the second lens group can be increased, a high zoom ratio can be efficiently realized, and fluctuations in spherical aberration and astigmatism during zooming can be suppressed.

また、本願の変倍光学系は、広角端状態から望遠端状態への変倍時に、前記第2レンズ群と前記第3レンズ群との間隔が減少することが望ましい。この構成により、第3レンズ群から第5レンズ群の合成倍率を増倍することができ、高変倍比を効率的に実現し変倍時の球面収差や非点収差の変動を抑えることができる。   In the zoom optical system of the present application, it is preferable that the distance between the second lens group and the third lens group is reduced when zooming from the wide-angle end state to the telephoto end state. With this configuration, the composite magnification of the third lens group to the fifth lens group can be increased, and a high zoom ratio can be efficiently realized to suppress variations in spherical aberration and astigmatism during zooming. it can.

また、本願の変倍光学系は、前記第5レンズ群が正の屈折力を有することが望ましい。この構成により、第5レンズ群の使用倍率が等倍よりも小さくなり、第1レンズ群から第4レンズ群までの合成焦点距離を相対的に大きくすることができる。その結果、製造時に第1レンズ群から第4レンズ群において発生するレンズどうしの偏芯に起因する偏芯コマ収差等の影響を相対的に小さく抑えることができ、高い光学性能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 fifth lens group has a positive refractive power. With this configuration, the use magnification of the fifth lens group becomes smaller than the same magnification, and the combined focal length from the first lens group to the fourth lens group can be relatively increased. As a result, the influence of decentration coma aberration and the like caused by the decentration of the lenses generated in the first lens group to the fourth lens group at the time of manufacture can be suppressed relatively small, and high optical performance can be realized. it can.

本願の光学装置は、上述した構成の変倍光学系を有することを特徴としている。これにより、高変倍比を有し、小型で、高い光学性能を有する光学装置を実現することができる。   The optical device of the present application is characterized by having the variable magnification optical system having the above-described configuration. Thereby, an optical device having a high zoom ratio, a small size, and high optical performance can be realized.

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、正屈折力の第1レンズ群と、負屈折力の第2レンズ群と、正屈折力の第3レンズ群と、正屈折力の第4レンズ群と、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、
前記第3レンズ群が以下の条件式(1)を満足するようにし、
広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔とが変化するようにし、前記第5レンズ群が像面に対して移動するようにし、
無限遠物体から近距離物体への合焦時に、前記第3レンズ群を光軸に沿って移動するようにすることを特徴としている。これにより、高変倍比を有し、小型で、無限遠物体から近距離物体への合焦時に高い光学性能を有する変倍光学系を製造することができる。
(1) 2.970 < f3/fw < 10.000
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3レンズ群の焦点距離
The variable magnification optical system manufacturing method 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 group having a positive refractive power. A method of manufacturing a variable magnification optical system having a fourth lens group having positive refractive power and a fifth lens group,
The third lens group satisfies the following conditional expression (1):
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, the distance between the second lens group and the third lens group, and the third lens group And the distance between the fourth lens group and the distance between the fourth lens group and the fifth lens group are changed, and the fifth lens group is moved relative to the image plane,
The third lens group is moved along the optical axis when focusing from an object at infinity to a near object. As a result, it is possible to manufacture a variable power optical system that has a high zoom ratio, is small, and has high optical performance when focusing from an object at infinity to a short distance object.
(1) 2.970 <f3 / fw <10.000
However,
fw: focal length of the entire zoom optical system in the wide-angle end state f3: focal length of the third lens group

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(a)、図1(b)、及び図1(c)はそれぞれ、本願の第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、及び望遠端状態における断面図である。
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、正の屈折力を有する第3レンズ群G3と、正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。第2レンズ群G2と第3レンズ群G3との間には、開口絞りSが備えられている。
(First embodiment)
1A, 1B, and 1C are cross-sectional views of the zoom optical system according to the first example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. It is.
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, and a third lens having a positive refractive power. The lens group G3 includes a fourth lens group G4 having a positive refractive power and a fifth lens group G5 having a positive refractive power. An aperture stop S is provided between the second lens group G2 and the third lens group G3.

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。
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と物体側に凹面を向けた負メニスカスレンズL24との接合レンズとからなる。なお、負メニスカスレンズL21は物体側のレンズ面を非球面形状としたガラスモールド非球面レンズである。
The first lens group G1 includes, in order from the object side, a cemented lens 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. Become.
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 negative surface having a concave surface directed toward the object side. It consists of a cemented lens with a meniscus lens L24. The negative meniscus lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.

第3レンズ群G3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L31と両凸形状の正レンズL32との接合レンズからなる。
第4レンズ群G4は、物体側から順に、両凸形状の正レンズL41と両凹形状の負レンズL42との接合レンズと、両凸形状の正レンズL43と物体側に凹面を向けた負メニスカスレンズL44との接合レンズと、両凹形状の負レンズL45と両凸形状の正レンズL46との接合レンズと、両凸形状の正レンズL47と物体側に凹面を向けた負メニスカスレンズL48との接合レンズとからなる。なお、負メニスカスレンズL48は像側のレンズ面を非球面形状としたガラスモールド非球面レンズである。
The third lens group G3 is composed of a cemented lens of a negative meniscus lens L31 having a convex surface directed toward the object side and a biconvex positive lens L32 in order from the object side.
The fourth lens group G4 includes, in order from the object side, a cemented lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a negative meniscus with a biconvex positive lens L43 and a concave meniscus facing the object side. A cemented lens with a lens L44, a cemented lens with a biconcave negative lens L45 and a biconvex positive lens L46, a biconvex positive lens L47, and a negative meniscus lens L48 with a concave surface facing the object side. It consists of a cemented lens. The negative meniscus lens L48 is a glass mold aspheric lens having an aspheric lens surface on the image side.

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と物体側に凹面を向けた負メニスカスレンズL52との接合レンズからなる。なお、負メニスカスレンズL52は像側のレンズ面を非球面形状としたガラスモールド非球面レンズである。   The fifth lens group G5 includes, in order from the object side, a cemented lens including a positive meniscus lens L51 having a concave surface facing the object side and a negative meniscus lens L52 having a concave surface facing the object side. The negative meniscus lens L52 is a glass mold aspheric lens having an aspheric lens surface on the image side.

以上の構成の下、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との空気間隔、第2レンズ群G2と第3レンズ群G3との空気間隔、第3レンズ群G3と第4レンズ群G4との空気間隔、第4レンズ群G4と第5レンズ群G5との空気間隔、及び第5レンズ群G5と像面Iとの空気間隔がそれぞれ変化するように、第1レンズ群G1〜第5レンズ群G5が光軸に沿って移動する。
詳細には、第1レンズ群G1〜第5レンズ群G5が物体側へ移動する。なお、開口絞りSは変倍時に第4レンズ群G4と一体的に物体側へ移動する。
また、無限遠物体から近距離物体への合焦は、第3レンズ群G3を光軸に沿って像面I側に移動させることで行う。
With the above-described configuration, 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 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state. The air gap between G2 and the third lens group G3, the air gap between the third lens group G3 and the fourth lens group G4, the air gap between the fourth lens group G4 and the fifth lens group G5, and the fifth lens group G5 The first lens group G1 to the fifth lens group G5 move along the optical axis so that the air spacing between the lens surface and the image plane I changes.
Specifically, the first lens group G1 to the fifth lens group G5 move to the object side. The aperture stop S moves to the object side integrally with the fourth lens group G4 during zooming.
Further, focusing from an infinitely distant object to a close object is performed by moving the third lens group G3 to the image plane I side along the optical axis.

これにより、変倍時に、第1レンズ群G1と第2レンズ群G2との空気間隔が増加し、第2レンズ群G2と第3レンズ群G3との空気間隔が減少し、第3レンズ群G3と第4レンズ群G4との空気間隔が増加し、第4レンズ群G4と第5レンズ群G5との空気間隔が増加し、第5レンズ群G5と像面Iとの空気間隔が増加する。なお、変倍時に開口絞りSと第3レンズ群G3との空気間隔が減少する。
これらにより、本実施例に係る変倍光学系は、高変倍率を有し、且つ小型に構成されている。
Thereby, at the time of zooming, the air gap between the first lens group G1 and the second lens group G2 increases, the air gap between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3. And the fourth lens group G4 increase, the air distance between the fourth lens group G4 and the fifth lens group G5 increases, and the air distance between the fifth lens group G5 and the image plane I increases. Note that the air space between the aperture stop S and the third lens group G3 decreases during zooming.
Accordingly, the variable magnification optical system according to the present embodiment has a high variable magnification and is configured in a small size.

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。
表1において、fは焦点距離、BFはバックフォーカス(最も像側のレンズ面と像面Iとの光軸上の距離)を示す。
[面データ]において、面番号は物体側から数えた光学面の順番、rは曲率半径、dは面間隔(第n面(nは整数)と第n+1面との間隔)、ndはd線(波長587.6nm)に対する屈折率、νdはd線(波長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、可変は可変の面間隔、絞りSは開口絞りS、像面は像面Iをそれぞれ示している。なお、曲率半径r=∞は平面を示している。非球面は面番号に*を付して曲率半径rの欄に近軸曲率半径の値を示している。空気の屈折率nd=1.000000の記載は省略している。
Table 1 below lists values of specifications of the variable magnification optical system according to the present example.
In Table 1, f indicates the focal length, and BF indicates the back focus (the distance on the optical axis between the lens surface closest to the image side and the image plane I).
In [Surface data], the surface number is the order of the optical surfaces counted from the object side, r is the radius of curvature, d is the surface interval (the interval between the nth surface (n is an integer) and the n + 1th surface), and nd is The refractive index for d-line (wavelength 587.6 nm) and νd indicate the Abbe number for d-line (wavelength 587.6 nm), respectively. In addition, the object plane indicates the object plane, the variable indicates the variable plane spacing, the stop S indicates the aperture stop S, and the image plane indicates the image plane I. The radius of curvature r = ∞ indicates a plane. For the aspherical surface, * is added to the surface number, and the value of the paraxial radius of curvature is indicated in the column of the radius of curvature r. The description of the refractive index of air nd = 1.00000 is omitted.

[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=(h/r)/[1+{1−κ(h/r)1/2
+A4h+A6h+A8h+A10h10+A12h12
ここで、hを光軸に垂直な方向の高さ、xを高さhにおける非球面の頂点の接平面から当該非球面までの光軸方向に沿った距離(サグ量)、κを円錐定数、A4,A6,A8,A10,A12を非球面係数、rを基準球面の曲率半径(近軸曲率半径)とする。なお、「E−n」(nは整数)は「×10−n」を示し、例えば「1.234E-05」は「1.234×10−5」を示す。2次の非球面係数A2は0であり、記載を省略している。
[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 + A12h 12
Here, h is the height in the direction perpendicular to the optical axis, x is the distance (sag amount) from the tangent plane of the apex of the aspheric surface to the aspheric surface at the height h, and κ is the conic constant. , A4, A6, A8, A10, A12 are aspherical coefficients, and r is the radius of curvature of the reference sphere (paraxial radius of curvature). “E−n” (n is an integer) indicates “× 10 −n ”, for example “1.234E-05” indicates “1.234 × 10 −5 ”. The secondary aspherical coefficient A2 is 0 and is not shown.

[各種データ]において、FNOはFナンバー、ωは半画角(単位は「°」)、Yは像高、TLは変倍光学系の全長(無限遠物体合焦時の第1面から像面Iまでの光軸上の距離)、dnは第n面と第n+1面との可変の間隔、φは開口絞りSの絞り径をそれぞれ示す。なお、これらの値は無限遠物体合焦時のものである。また、Wは広角端状態、Mは中間焦点距離状態、Tは望遠端状態をそれぞれ示す。
[合焦時の合焦群移動量]は、無限遠合焦状態から近距離合焦状態(撮影倍率-0.0100倍)への、合焦レンズ群(第3レンズ群)の移動量を示す。ここで、合焦レンズ群の移動方向は像側への移動を正とする。また撮影距離は、物体から像面までの距離を示す。
[レンズ群データ]には、各レンズ群の始面と焦点距離を示す。
[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す。
In [Various data], FNO is the F number, ω is the half angle of view (unit is “°”), Y is the image height, TL is the total length of the variable magnification optical system (image from the first surface when focusing on an object at infinity) (Distance on the optical axis to the surface I), dn represents the variable distance between the nth surface and the (n + 1) th surface, and φ represents the diameter of the aperture stop S. These values are those when focusing on an object at infinity. W represents the wide-angle end state, M represents the intermediate focal length state, and T represents the telephoto end state.
[Focus group movement amount at the time of focusing] indicates the movement amount of the focusing lens group (third lens group) from the infinitely focused state to the short-distance focused state (imaging magnification: -0.0100 times). Here, the moving direction of the focusing lens group is positive when moving toward the image side. The shooting distance indicates the distance from the object to the image plane.
[Lens Group Data] indicates the start surface and focal length of each lens group.
[Conditional Expression Corresponding Value] shows 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及びその他の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。
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。
Here, the focal length f, the radius of curvature r, and other length units listed in Table 1 are generally “mm”. However, the optical system is not limited to this because an equivalent optical performance can be obtained even when proportionally enlarged or proportionally reduced.
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)第1実施例
[面データ]
面番号 r d nd νd
物面 ∞

1 135.6506 1.6350 1.950000 29.37
2 41.9822 8.2991 1.497820 82.57
3 -344.6351 0.1000
4 45.0112 4.7994 1.834810 42.73
5 373.7571 可変

*6 345.5995 1.0000 1.851348 40.10
7 9.1082 4.2862
8 -21.4543 1.0000 1.903660 31.27
9 38.9573 0.7420
10 26.9213 4.0891 1.808090 22.74
11 -12.6120 1.0000 1.883000 40.66
12 -42.4301 可変

13(絞りS) ∞ 可変

14 29.6793 1.0000 1.883000 40.66
15 15.0612 3.3397 1.593190 67.90
16 -42.4934 可変

17 12.5743 8.9691 1.717000 47.97
18 -33.1381 1.0000 1.883000 40.66
19 10.7605 2.0000
20 19.2566 3.2971 1.516800 63.88
21 -11.7331 1.0000 1.850260 32.35
22 -20.8570 1.5000
23 -40.3315 1.0000 1.950000 29.37
24 11.6425 3.4850 1.672700 32.18
25 -26.8269 0.1735
26 33.9424 5.2543 1.581440 40.98
27 -8.0332 1.0000 1.820798 42.71
*28 -31.1190 可変

29 -40.0000 2.0872 1.497820 82.57
30 -16.7056 1.0000 1.834410 37.28
*31 -21.8116 BF

像面 ∞

[非球面データ]
第6面
κ 11.00000
A4 3.74799E-05
A6 -8.44116E-08
A8 -3.25426E-09
A10 4.01677E-11
A12 -1.75260E-13

第28面
κ 1.00000
A4 -7.52150E-05
A6 -3.56328E-07
A8 1.74159E-09
A10 -3.33007E-11
A12 0.00000E+0 0

第31面
κ 1.00000
A4 2.74991E-05
A6 -2.52954E-09
A8 -1.90467E-10
A10 0.00000E+00
A12 0.00000E+00

[各種データ]
変倍比 14.13

W T
f 9.27 〜 130.95
FNO 4.12 〜 5.77
ω 42.66 〜 3.35°
Y 8.00 〜 8.00
TL 111.87 〜 169.05

W M T
f 9.27000 60.49999 130.94999
ω 42.66043 7.22371 3.35343
FNO 4.12 5.77 5.77
φ 8.49 9.57 11.01
d5 2.10000 36.64491 46.82787
d12 24.15923 5.26241 2.20000
d13 4.86826 4.21826 1.80000
d16 2.25000 2.90000 5.31826
d28 1.50000 29.01348 34.90774
BF 13.93934 14.90154 14.93894

[合焦時の合焦群移動量]
W M T
撮影倍率 -0.0100 -0.0100 -0.0100
撮影距離 901.6746 5886.4066 12728.2773
移動量 0.1610 0.1701 0.3030

[レンズ群データ]
群 始面 f
1 1 69.37620
2 6 -9.50000
3 14 41.26133
4 17 51.13596
5 29 150.09211

[条件式対応値]
(1)f3/fw = 4.451
(2)(d1it−d1iw)/fw = 6.168
(3)(d5it−d5iw)/(d3it−d3iw) = 0.027
(4)f3/f4 = 0.807
(Table 1) First Example
[Surface data]
Surface number r d nd νd
Object ∞

1 135.6506 1.6350 1.950000 29.37
2 41.9822 8.2991 1.497820 82.57
3 -344.6351 0.1000
4 45.0112 4.7994 1.834810 42.73
5 373.7571 Variable

* 6 345.5995 1.0000 1.851348 40.10
7 9.1082 4.2862
8 -21.4543 1.0000 1.903660 31.27
9 38.9573 0.7420
10 26.9213 4.0891 1.808090 22.74
11 -12.6120 1.0000 1.883000 40.66
12 -42.4301 Variable

13 (Aperture S) ∞ Variable

14 29.6793 1.0000 1.883000 40.66
15 15.0612 3.3397 1.593190 67.90
16 -42.4934 Variable

17 12.5743 8.9691 1.717000 47.97
18 -33.1381 1.0000 1.883000 40.66
19 10.7605 2.0000
20 19.2566 3.2971 1.516800 63.88
21 -11.7331 1.0000 1.850260 32.35
22 -20.8570 1.5000
23 -40.3315 1.0000 1.950000 29.37
24 11.6425 3.4850 1.672700 32.18
25 -26.8269 0.1735
26 33.9424 5.2543 1.581440 40.98
27 -8.0332 1.0000 1.820798 42.71
* 28 -31.1190 Variable

29 -40.0000 2.0872 1.497820 82.57
30 -16.7056 1.0000 1.834410 37.28
* 31 -21.8116 BF

Image plane ∞

[Aspherical data]
6th surface κ 11.00000
A4 3.74799E-05
A6 -8.44116E-08
A8 -3.25426E-09
A10 4.01677E-11
A12 -1.75260E-13

28th surface κ 1.00000
A4 -7.52150E-05
A6 -3.56328E-07
A8 1.74159E-09
A10 -3.33007E-11
A12 0.00000E + 0 0

31st surface κ 1.00000
A4 2.74991E-05
A6 -2.52954E-09
A8 -1.90467E-10
A10 0.00000E + 00
A12 0.00000E + 00

[Various data]
Scaling ratio 14.13

W T
f 9.27 to 130.95
FNO 4.12 to 5.77
ω 42.66-3.35 °
Y 8.00-8.00
TL 111.87 〜 169.05

W M T
f 9.27000 60.49999 130.94999
ω 42.66043 7.22371 3.35343
FNO 4.12 5.77 5.77
φ 8.49 9.57 11.01
d5 2.10000 36.64491 46.82787
d12 24.15923 5.26241 2.20000
d13 4.86826 4.21826 1.80000
d16 2.25000 2.90000 5.31826
d28 1.50000 29.01348 34.90774
BF 13.93934 14.90154 14.93894

[Focus group movement during focusing]
W M T
Shooting magnification -0.0100 -0.0100 -0.0100
Shooting distance 901.6746 5886.4066 12728.2773
Travel 0.1610 0.1701 0.3030

[Lens group data]
Group start surface f
1 1 69.37620
2 6 -9.50000
3 14 41.26133
4 17 51.13596
5 29 150.09211

[Conditional expression values]
(1) f3 / fw = 4.451
(2) (d1it-d1iw) / fw = 6.168
(3) (d5it-d5iw) / (d3it-d3iw) = 0.027
(4) f3 / f4 = 0.807

図2(a)、図2(b)、及び図2(c)はそれぞれ、本願の第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、及び望遠端状態における無限遠物体合焦時の諸収差図である。
図3(a)、図3(b)、及び図3(c)はそれぞれ、本願の第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、及び望遠端状態における近距離物体合焦時(撮影倍率-0.0100倍)の諸収差図である。
2 (a), 2 (b), and 2 (c) respectively show infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the first example of the present application. It is an aberration diagram at the time of focusing on an object.
3 (a), 3 (b), and 3 (c) are short distances 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 of the present application, respectively. FIG. 6 is a diagram showing various aberrations when the object is in focus (imaging magnification: -0.0100 times).

各収差図において、FNOはFナンバー、NAは最も像側のレンズから射出する光線の開口数、Aは光線入射角即ち半画角(単位は「°」)、H0は物体高(単位:mm)をそれぞれ示す。dはd線(波長587.6nm)、gはg線(波長435.8nm)における収差をそれぞれ示し、d、gの記載のないものはd線における収差を示す。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、後述する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。   In each aberration diagram, FNO is the F number, NA is the numerical aperture of the light beam emitted from the lens closest to the image side, A is the light beam incident angle, that is, the half field angle (unit is “°”), and H0 is the object height (unit: mm). ) Respectively. d indicates the aberration at the d-line (wavelength 587.6 nm), g indicates the aberration at the g-line (wavelength 435.8 nm), and those without d and g indicate the aberration at the d-line. 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 embodiment are used in the aberration diagrams of each embodiment described later.

各収差図より、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、また、無限遠物体合焦状態から近距離物体合焦状態まで諸収差が良好に補正され、高い光学性能を有していることがわかる。
From the respective aberration diagrams, the variable magnification optical system according to the present embodiment has various aberrations well corrected from the wide-angle end state to the telephoto end state, and from the infinite object focusing state to the short-distance object focusing state, and is high. It can be seen that it has optical performance.

(第2実施例)
図4(a)、図4(b)、及び図4(c)はそれぞれ、本願の第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、及び望遠端状態における断面図である。
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、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4と、負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。第2レンズ群G2と第3レンズ群G3との間には、開口絞りSが備えられている。
(Second embodiment)
FIGS. 4A, 4B, and 4C are cross-sectional views of the zoom optical system according to the second example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. It is.
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, and a third lens having a positive refractive power. The lens group G3 includes a fourth lens group G4 having a positive refractive power and a fifth lens group G5 having a negative refractive power. An aperture stop S is provided between the second lens group G2 and the third lens group G3.

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。
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との接合レンズとからなる。なお、負メニスカスレンズL21は物体側のレンズ面を非球面形状としたガラスモールド非球面レンズである。
The first lens group G1 includes, in order from the object side, a cemented lens 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. Become.
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. The cemented lens. The negative meniscus lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.

第3レンズ群G3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L31と両凸形状の正レンズL32との接合レンズからなる。
第4レンズ群G4は、物体側から順に、両凸形状の正レンズL41と両凹形状の負レンズL42との接合レンズと、両凸形状の正レンズL43と物体側に凹面を向けた負メニスカスレンズL44との接合レンズと、両凹形状の負レンズL45と両凸形状の正レンズL46との接合レンズと、両凸形状の正レンズL47と物体側に凹面を向けた負メニスカスレンズL48との接合レンズとからなる。なお、負メニスカスレンズL48は像側のレンズ面を非球面形状としたガラスモールド非球面レンズである。
The third lens group G3 is composed of a cemented lens of a negative meniscus lens L31 having a convex surface directed toward the object side and a biconvex positive lens L32 in order from the object side.
The fourth lens group G4 includes, in order from the object side, a cemented lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a negative meniscus with a biconvex positive lens L43 and a concave meniscus facing the object side. A cemented lens with a lens L44, a cemented lens with a biconcave negative lens L45 and a biconvex positive lens L46, a biconvex positive lens L47, and a negative meniscus lens L48 with a concave surface facing the object side. It consists of a cemented lens. The negative meniscus lens L48 is a glass mold aspheric lens having an aspheric lens surface on the image side.

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と物体側に凹面を向けた負メニスカスレンズL52との接合レンズからなる。なお、負メニスカスレンズL52は像側のレンズ面を非球面形状としたガラスモールド非球面レンズである。   The fifth lens group G5 includes, in order from the object side, a cemented lens including a positive meniscus lens L51 having a concave surface facing the object side and a negative meniscus lens L52 having a concave surface facing the object side. The negative meniscus lens L52 is a glass mold aspheric lens having an aspheric lens surface on the image side.

以上の構成の下、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との空気間隔、第2レンズ群G2と第3レンズ群G3との空気間隔、第3レンズ群G3と第4レンズ群G4との空気間隔、第4レンズ群G4と第5レンズ群G5との空気間隔、及び第5レンズ群G5と像面Iとの空気間隔がそれぞれ変化するように、第1レンズ群G1〜第5レンズ群G5が光軸に沿って移動する。
詳細には、第1レンズ群G1〜第5レンズ群G5が物体側へ移動する。なお、開口絞りSは変倍時に第4レンズ群G4と一体的に物体側へ移動する。
また、無限遠物体から近距離物体への合焦は、第3レンズ群G3を光軸に沿って像面I側に移動させることで行う。
With the above-described configuration, 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 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state. The air gap between G2 and the third lens group G3, the air gap between the third lens group G3 and the fourth lens group G4, the air gap between the fourth lens group G4 and the fifth lens group G5, and the fifth lens group G5 The first lens group G1 to the fifth lens group G5 move along the optical axis so that the air spacing between the lens surface and the image plane I changes.
Specifically, the first lens group G1 to the fifth lens group G5 move to the object side. The aperture stop S moves to the object side integrally with the fourth lens group G4 during zooming.
Further, focusing from an infinitely distant object to a close object is performed by moving the third lens group G3 to the image plane I side along the optical axis.

これにより、変倍時に、第1レンズ群G1と第2レンズ群G2との空気間隔が増加し、第2レンズ群G2と第3レンズ群G3との空気間隔が減少し、第4レンズ群G4と第5レンズ群G5との空気間隔が増加し、第5レンズ群G5と像面Iとの空気間隔が増加する。第3レンズ群G3と第4レンズ群G4との空気間隔は、広角端状態から中間焦点距離状態まで減少し、中間焦点距離状態から望遠端状態まで増加する。なお、変倍時に開口絞りSと第3レンズ群G3との空気間隔は、広角端状態から中間焦点距離状態まで増加し、中間焦点距離状態から望遠端状態まで減少する。
これらにより、本実施例に係る変倍光学系は、高変倍率を有し、且つ小型に構成されている。
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。
Thereby, at the time of zooming, the air gap between the first lens group G1 and the second lens group G2 increases, the air gap between the second lens group G2 and the third lens group G3 decreases, and the fourth lens group G4. And the fifth lens group G5 increase, and the air distance between the fifth lens group G5 and the image plane I increases. The air space between the third lens group G3 and the fourth lens group G4 decreases from the wide-angle end state to the intermediate focal length state, and increases from the intermediate focal length state to the telephoto end state. At the time of zooming, the air gap between the aperture stop S and the third lens group G3 increases from the wide-angle end state to the intermediate focal length state and decreases from the intermediate focal length state to the telephoto end state.
Accordingly, the variable magnification optical system according to the present embodiment has a high variable magnification and is configured in a small size.
Table 2 below provides values of specifications of the variable magnification optical system according to the present example.

(表2)第2実施例
[面データ]
面番号 r d nd νd
物面 ∞

1 141.5341 1.6350 1.950000 29.37
2 42.4212 8.4111 1.497820 82.57
3 -315.7583 0.1000
4 44.6738 4.8257 1.834810 42.73
5 329.2991 可変

*6 500.0000 1.0000 1.851348 40.10
7 9.1215 4.1187
8 -36.3703 1.0000 1.903660 31.27
9 36.8310 0.5585
10 20.9196 4.4577 1.808090 22.74
11 -11.3592 1.0000 1.883000 40.66
12 231.4820 可変

13(絞りS) ∞ 可変

14 27.6206 1.0000 1.883000 40.66
15 13.6993 3.2013 1.593190 67.90
16 -42.3833 可変

17 13.2112 9.5050 1.717000 47.97
18 -49.0716 1.0000 1.883000 40.66
19 11.5987 2.0000
20 23.5510 3.3277 1.516800 63.88
21 -10.5463 1.0000 1.850260 32.35
22 -17.4426 1.5000
23 -39.5142 1.0000 1.950000 29.37
24 14.3546 3.3123 1.672700 32.18
25 -31.7031 1.0351
26 20.4892 5.4304 1.581440 40.98
27 -9.0024 1.0000 1.820798 42.71
*28 -40.3228 可変

29 -59.5141 1.1354 1.497820 82.57
30 -26.1606 1.0000 1.834410 37.28
*31 -50.8846 BF

像面 ∞

[非球面データ]
第6面
κ -9.00000
A4 3.41888E-05
A6 -2.73054E-08
A8 -3.06893E-09
A10 3.86737E-11
A12 -1.69230E-13

第28面
κ 1.00000
A4 -6.20378E-05
A6 -2.88775E-07
A8 3.11023E-09
A10 -4.32584E-11
A12 0.00000E+00

第31面
κ 1.00000
A4 2.66064E-05
A6 1.04446E-07
A8 -5.78528E-10
A10 0.00000E+00
A12 0.00000E+00

[各種データ]
変倍比 14.13

W T
f 9.27 〜 130.95
FNO 4.12 〜 5.81
ω 42.67 〜 3.42°
Y 8.00 〜 8.00
TL 111.02 〜 169.05

W M T
f 9.27006 60.50093 130.95187
ω 42.67385 7.37624 3.41696
FNO 4.12 5.77 5.81
φ 8.83 9.26 10.38
d5 2.10000 37.01608 47.51778
d12 23.62886 5.00952 2.20000
d13 2.40610 3.40014 1.80000
d16 3.89404 2.90000 4.50014
d28 1.50000 16.70292 20.53836
BF 13.93925 26.92305 28.93970

[合焦時の合焦群移動量]
W M T
撮影倍率 -0.0100 -0.0100 -0.0100
撮影距離 902.7175 5891.6497 12742.6968
移動量 0.1146 0.1322 0.2361

[レンズ群データ]
群 始面 f
1 1 70.20776
2 6 -8.28282
3 14 40.62229
4 17 37.83706
5 29 -216.44842

[条件式対応値]
(1)f3/fw = 4.382
(2)(d1it−d1iw)/fw = 6.260
(3)(d5it−d5iw)/(d3it−d3iw) = 0.433
(4)f3/f4 = 1.074
(Table 2) Second Example
[Surface data]
Surface number r d nd νd
Object ∞

1 141.5341 1.6350 1.950000 29.37
2 42.4212 8.4111 1.497820 82.57
3 -315.7583 0.1000
4 44.6738 4.8257 1.834810 42.73
5 329.2991 Variable

* 6 500.0000 1.0000 1.851348 40.10
7 9.1215 4.1187
8 -36.3703 1.0000 1.903660 31.27
9 36.8310 0.5585
10 20.9196 4.4577 1.808090 22.74
11 -11.3592 1.0000 1.883000 40.66
12 231.4820 Variable

13 (Aperture S) ∞ Variable

14 27.6206 1.0000 1.883000 40.66
15 13.6993 3.2013 1.593190 67.90
16 -42.3833 Variable

17 13.2112 9.5050 1.717000 47.97
18 -49.0716 1.0000 1.883000 40.66
19 11.5987 2.0000
20 23.5510 3.3277 1.516800 63.88
21 -10.5463 1.0000 1.850260 32.35
22 -17.4426 1.5000
23 -39.5142 1.0000 1.950000 29.37
24 14.3546 3.3123 1.672700 32.18
25 -31.7031 1.0351
26 20.4892 5.4304 1.581440 40.98
27 -9.0024 1.0000 1.820798 42.71
* 28 -40.3228 Variable

29 -59.5141 1.1354 1.497820 82.57
30 -26.1606 1.0000 1.834410 37.28
* 31 -50.8846 BF

Image plane ∞

[Aspherical data]
6th surface κ -9.00000
A4 3.41888E-05
A6 -2.73054E-08
A8 -3.06893E-09
A10 3.86737E-11
A12 -1.69230E-13

28th surface κ 1.00000
A4 -6.20378E-05
A6 -2.88775E-07
A8 3.11023E-09
A10 -4.32584E-11
A12 0.00000E + 00

31st surface κ 1.00000
A4 2.66064E-05
A6 1.04446E-07
A8 -5.78528E-10
A10 0.00000E + 00
A12 0.00000E + 00

[Various data]
Scaling ratio 14.13

W T
f 9.27 to 130.95
FNO 4.12 to 5.81
ω 42.67 to 3.42 °
Y 8.00-8.00
TL 111.02-169.05

W M T
f 9.27006 60.50093 130.95187
ω 42.67385 7.37624 3.41696
FNO 4.12 5.77 5.81
φ 8.83 9.26 10.38
d5 2.10000 37.01608 47.51778
d12 23.62886 5.00952 2.20000
d13 2.40610 3.40014 1.80000
d16 3.89404 2.90000 4.50014
d28 1.50000 16.70292 20.53836
BF 13.93925 26.92305 28.93970

[Focus group movement during focusing]
W M T
Shooting magnification -0.0100 -0.0100 -0.0100
Shooting distance 902.7175 5891.6497 12742.6968
Travel 0.1146 0.1322 0.2361

[Lens group data]
Group start surface f
1 1 70.20776
2 6 -8.28282
3 14 40.62229
4 17 37.83706
5 29 -216.44842

[Conditional expression values]
(1) f3 / fw = 4.382
(2) (d1it-d1iw) /fw=6.260
(3) (d5it-d5iw) / (d3it-d3iw) = 0.433
(4) f3 / f4 = 1.074

図5(a)、図5(b)、及び図5(c)はそれぞれ、本願の第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、及び望遠端状態における無限遠物体合焦時の諸収差図である。
図6(a)、図6(b)、及び図6(c)はそれぞれ、本願の第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、及び望遠端状態における近距離物体合焦時(撮影倍率-0.0100倍)の諸収差図である。
FIGS. 5 (a), 5 (b), and 5 (c) respectively show infinity 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 second example of the present application. It is an aberration diagram at the time of focusing on an object.
6 (a), 6 (b), and 6 (c) are short distances 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 second example of the present application, respectively. FIG. 6 is a diagram showing various aberrations when the object is in focus (imaging magnification: -0.0100 times).

各収差図より、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、また、無限遠物体合焦状態から近距離物体合焦状態まで諸収差が良好に補正され、高い光学性能を有していることがわかる。
From the respective aberration diagrams, the variable magnification optical system according to the present embodiment has various aberrations well corrected from the wide-angle end state to the telephoto end state, and from the infinite object focusing state to the short-distance object focusing state, and is high. It can be seen that it has optical performance.

(第3実施例)
図7(a)、図7(b)、及び図7(c)はそれぞれ、本願の第3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、及び望遠端状態における断面図である。
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、正の屈折力を有する第3レンズ群G3と、正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。第2レンズ群G2と第3レンズ群G3との間には、開口絞りSが備えられている。
(Third embodiment)
FIGS. 7A, 7B, and 7C are cross-sectional views of the zoom optical system according to the third example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. It is.
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, and a third lens having a positive refractive power. The lens group G3 includes a fourth lens group G4 having a positive refractive power and a fifth lens group G5 having a positive refractive power. An aperture stop S is provided between the second lens group G2 and the third lens group G3.

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。
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との接合レンズとからなる。なお、負メニスカスレンズL21は物体側のレンズ面を非球面形状としたガラスモールド非球面レンズである。
The first lens group G1 includes, in order from the object side, a cemented lens 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. Become.
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. The cemented lens. The negative meniscus lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.

第3レンズ群G3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L31と両凸形状の正レンズL32との接合レンズからなる。
第4レンズ群G4は、物体側から順に、物体側に凸面を向けた正メニスカスレンズL41と物体側に凸面を向けた負メニスカスレンズL42との接合レンズと、両凸形状の正レンズL43と物体側に凹面を向けた負メニスカスレンズL44との接合レンズと、物体側に凸面を向けた負メニスカスレンズL45と、両凸形状の正レンズL46と物体側に凹面を向けた負メニスカスレンズL47との接合レンズとからなる。なお、負メニスカスレンズL45は物体側のレンズ面を非球面形状としたガラスモールド非球面レンズであり、負メニスカスレンズL47は像側のレンズ面を非球面形状としたガラスモールド非球面レンズである。
The third lens group G3 is composed of a cemented lens of a negative meniscus lens L31 having a convex surface directed toward the object side and a biconvex positive lens L32 in order from the object side.
In order from the object side, the fourth lens group G4 includes a cemented lens of a positive meniscus lens L41 having a convex surface directed toward the object side and a negative meniscus lens L42 having a convex surface directed toward the object side, a biconvex positive lens L43, and an object. A cemented lens with a negative meniscus lens L44 having a concave surface on the side, a negative meniscus lens L45 having a convex surface on the object side, a positive lens L46 having a biconvex shape, and a negative meniscus lens L47 having a concave surface on the object side It consists of a cemented lens. The negative meniscus lens L45 is a glass mold aspheric lens having an aspheric lens surface on the object side, and the negative meniscus lens L47 is a glass mold aspheric lens having an aspheric lens surface on the image side.

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と物体側に凹面を向けた負メニスカスレンズL52との接合レンズからなる。なお、負メニスカスレンズL52は像側のレンズ面を非球面形状としたガラスモールド非球面レンズである。   The fifth lens group G5 includes, in order from the object side, a cemented lens including a positive meniscus lens L51 having a concave surface facing the object side and a negative meniscus lens L52 having a concave surface facing the object side. The negative meniscus lens L52 is a glass mold aspheric lens having an aspheric lens surface on the image side.

以上の構成の下、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との空気間隔、第2レンズ群G2と第3レンズ群G3との空気間隔、第3レンズ群G3と第4レンズ群G4との空気間隔、第4レンズ群G4と第5レンズ群G5との空気間隔、及び第5レンズ群G5と像面Iとの空気間隔がそれぞれ変化するように、第1レンズ群G1〜第5レンズ群G5が光軸に沿って移動する。
詳細には、第1レンズ群G1〜第4レンズ群G4が物体側へ移動する。第5レンズ群G5は、広角端状態から中間焦点距離状態まで物体側へ移動し、中間焦点距離状態から望遠端状態までは像側へ移動する。なお、開口絞りSは変倍時に第4レンズ群G4と一体的に物体側へ移動する。
また、無限遠物体から近距離物体への合焦は、第3レンズ群G3を光軸に沿って像面I側に移動させることで行う。
With the above-described configuration, 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 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state. The air gap between G2 and the third lens group G3, the air gap between the third lens group G3 and the fourth lens group G4, the air gap between the fourth lens group G4 and the fifth lens group G5, and the fifth lens group G5 The first lens group G1 to the fifth lens group G5 move along the optical axis so that the air spacing between the lens surface and the image plane I changes.
Specifically, the first lens group G1 to the fourth lens group G4 move to the object side. The fifth lens group G5 moves toward the object side from the wide-angle end state to the intermediate focal length state, and moves toward the image side from the intermediate focal length state to the telephoto end state. The aperture stop S moves to the object side integrally with the fourth lens group G4 during zooming.
Further, focusing from an infinitely distant object to a close object is performed by moving the third lens group G3 to the image plane I side along the optical axis.

これにより、変倍時に、第1レンズ群G1と第2レンズ群G2との空気間隔が増加し、第2レンズ群G2と第3レンズ群G3との空気間隔が減少し、第4レンズ群G4と第5レンズ群G5との空気間隔が増加する。第3レンズ群G3と第4レンズ群G4との空気間隔は、広角端状態から中間焦点距離状態まで減少し、中間焦点距離状態から望遠端状態まで増加する。第5レンズ群G5と像面Iとの空気間隔は、広角端状態から中間焦点距離状態まで増加し、中間焦点距離状態から望遠端状態まで減少する。なお、変倍時に開口絞りSと第3レンズ群G3との空気間隔は、広角端状態から中間焦点距離状態まで増加し、中間焦点距離状態から望遠端状態まで減少する。
これらにより、本実施例に係る変倍光学系は、高変倍率を有し、且つ小型に構成されている。
以下の表3に、本実施例に係る変倍光学系の諸元の値を掲げる。
Thereby, at the time of zooming, the air gap between the first lens group G1 and the second lens group G2 increases, the air gap between the second lens group G2 and the third lens group G3 decreases, and the fourth lens group G4. And the fifth lens group G5 increase in air space. The air space between the third lens group G3 and the fourth lens group G4 decreases from the wide-angle end state to the intermediate focal length state, and increases from the intermediate focal length state to the telephoto end state. The air space between the fifth lens group G5 and the image plane I increases from the wide-angle end state to the intermediate focal length state and decreases from the intermediate focal length state to the telephoto end state. At the time of zooming, the air gap between the aperture stop S and the third lens group G3 increases from the wide-angle end state to the intermediate focal length state and decreases from the intermediate focal length state to the telephoto end state.
Accordingly, the variable magnification optical system according to the present embodiment has a high variable magnification and is configured in a small size.
Table 3 below lists values of specifications of the variable magnification optical system according to the present example.

(表3)第3実施例
[面データ]
面番号 r d nd νd
物面 ∞

1 125.4788 1.6350 1.950000 29.37
2 42.8963 8.6176 1.497820 82.57
3 -200.0000 0.1000
4 41.6251 4.9380 1.816000 46.59
5 230.0985 可変

*6 500.0000 1.0000 1.851348 40.10
7 9.5652 3.8048
8 -36.8357 1.0000 1.883000 40.66
9 44.2906 0.3520
10 18.6401 4.2703 1.808090 22.74
11 -12.0124 1.0000 1.902650 35.72
12 83.8674 可変

13(絞りS) ∞ 可変

14 23.0558 1.0000 1.883000 40.66
15 12.1495 3.4115 1.593190 67.90
16 -46.4710 可変

17 13.4790 6.8280 1.816000 46.59
18 22.4551 1.0000 1.850260 32.35
19 10.9985 2.0000
20 19.0986 3.2170 1.516800 63.88
21 -11.7780 1.0000 1.850260 32.35
22 -21.0372 1.5000
*23 689.8893 1.0000 1.806100 40.73
24 15.3049 2.8460
25 16.4239 5.9978 1.567320 42.58
26 -8.0000 1.0000 1.851348 40.10
*27 -24.2284 可変

28 -40.0000 1.6708 1.497820 82.57
29 -19.2635 1.0000 1.834410 37.28
*30 -24.2511 BF

像面 ∞

[非球面データ]
第6面
κ 11.00000
A4 1.38428E-05
A6 2.39881E-07
A8 -9.46864E-09
A10 1.17699E-10
A12 -5.24010E-13

第23面
κ 1.00000
A4 -1.65484E-05
A6 7.20023E-07
A8 -8.24637E-09
A10 1.55522E-10
A12 0.00000E+00

第27面
κ 1.00000
A4 -5.27520E-05
A6 1.28445E-07
A8 -5.41725E-09
A10 1.08848E-11
A12 0.00000E+00

第30面
κ 1.00000
A4 3.58303E-05
A6 -1.13073E-07
A8 6.69333E-10
A10 0.00000E+00
A12 0.00000E+00

[各種データ]
変倍比 14.13

W T
f 10.30 〜 145.50
FNO 4.12 〜 5.77
ω 39.66 〜 3.01°
Y 8.00 〜 8.00
TL 107.35 〜 157.35

W M T
f 10.30000 59.49997 145.49942
ω 39.65540 7.34800 3.01140
FNO 4.12 5.76 5.77
φ 8.49 8.51 10.06
d5 2.10000 32.00138 41.35684
d12 22.21167 6.19340 2.20000
d13 3.21330 4.23594 1.80000
d16 4.08103 3.05839 5.49433
d27 1.60536 23.96409 31.36057
BF 13.94931 15.18421 14.94893

[合焦時の合焦群移動量]
W M T
撮影倍率 -0.0100 -0.0100 -0.0100
撮影距離 1003.1781 5789.3595 14161.5191
移動量 0.1286 0.1638 0.3103

[レンズ群データ]
群 始面 f
1 1 62.41033
2 6 -8.66265
3 14 37.00000
4 17 45.93796
5 28 189.05625

[条件式対応値]
(1)f3/fw = 3.592
(2)(d1it−d1iw)/fw = 4.854
(3)(d5it−d5iw)/(d3it−d3iw) = 0.031
(4)f3/f4 = 0.805
(Table 3) Third Example
[Surface data]
Surface number r d nd νd
Object ∞

1 125.4788 1.6350 1.950000 29.37
2 42.8963 8.6176 1.497820 82.57
3 -200.0000 0.1000
4 41.6251 4.9380 1.816000 46.59
5 230.0985 Variable

* 6 500.0000 1.0000 1.851348 40.10
7 9.5652 3.8048
8 -36.8357 1.0000 1.883000 40.66
9 44.2906 0.3520
10 18.6401 4.2703 1.808090 22.74
11 -12.0124 1.0000 1.902650 35.72
12 83.8674 Variable

13 (Aperture S) ∞ Variable

14 23.0558 1.0000 1.883000 40.66
15 12.1495 3.4115 1.593190 67.90
16 -46.4710 Variable

17 13.4790 6.8280 1.816000 46.59
18 22.4551 1.0000 1.850260 32.35
19 10.9985 2.0000
20 19.0986 3.2170 1.516800 63.88
21 -11.7780 1.0000 1.850260 32.35
22 -21.0372 1.5000
* 23 689.8893 1.0000 1.806100 40.73
24 15.3049 2.8460
25 16.4239 5.9978 1.567320 42.58
26 -8.0000 1.0000 1.851348 40.10
* 27 -24.2284 Variable

28 -40.0000 1.6708 1.497820 82.57
29 -19.2635 1.0000 1.834410 37.28
* 30 -24.2511 BF

Image plane ∞

[Aspherical data]
6th surface κ 11.00000
A4 1.38428E-05
A6 2.39881E-07
A8 -9.46864E-09
A10 1.17699E-10
A12 -5.24010E-13

23rd surface κ 1.00000
A4 -1.65484E-05
A6 7.20023E-07
A8 -8.24637E-09
A10 1.55522E-10
A12 0.00000E + 00

27th surface κ 1.00000
A4 -5.27520E-05
A6 1.28445E-07
A8 -5.41725E-09
A10 1.08848E-11
A12 0.00000E + 00

30th surface κ 1.00000
A4 3.58303E-05
A6 -1.13073E-07
A8 6.69333E-10
A10 0.00000E + 00
A12 0.00000E + 00

[Various data]
Scaling ratio 14.13

W T
f 10.30 to 145.50
FNO 4.12 to 5.77
ω 39.66 to 3.01 °
Y 8.00-8.00
TL 107.35-157.35

W M T
f 10.30000 59.49997 145.49942
ω 39.65540 7.34800 3.01140
FNO 4.12 5.76 5.77
φ 8.49 8.51 10.06
d5 2.10000 32.00138 41.35684
d12 22.21167 6.19340 2.20000
d13 3.21330 4.23594 1.80000
d16 4.08103 3.05839 5.49433
d27 1.60536 23.96409 31.36057
BF 13.94931 15.18421 14.94893

[Focus group movement during focusing]
W M T
Shooting magnification -0.0100 -0.0100 -0.0100
Shooting distance 1003.1781 5789.3595 14161.5191
Travel 0.1286 0.1638 0.3103

[Lens group data]
Group start surface f
1 1 62.41033
2 6 -8.66265
3 14 37.00000
4 17 45.93796
5 28 189.05625

[Conditional expression values]
(1) f3 / fw = 3.592
(2) (d1it−d1iw) /fw=4.854
(3) (d5it-d5iw) / (d3it-d3iw) = 0.031
(4) f3 / f4 = 0.805

図8(a)、図8(b)、及び図8(c)はそれぞれ、本願の第3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、及び望遠端状態における無限遠物体合焦時の諸収差図である。
図9(a)、図9(b)、及び図9(c)はそれぞれ、本願の第3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、及び望遠端状態における近距離物体合焦時(撮影倍率-0.0100倍)の諸収差図である。
8 (a), 8 (b), and 8 (c) respectively show infinity 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 third example of the present application. It is an aberration diagram at the time of focusing on an object.
FIGS. 9A, 9B, and 9C are short distances 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 third example of the present application, respectively. FIG. 6 is a diagram showing various aberrations when the object is in focus (imaging magnification: -0.0100 times).

各収差図より、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、また、無限遠物体合焦状態から近距離物体合焦状態まで諸収差が良好に補正され、高い光学性能を有していることがわかる。   From the respective aberration diagrams, the variable magnification optical system according to the present embodiment has various aberrations well corrected from the wide-angle end state to the telephoto end state, and from the infinite object focusing state to the short-distance object focusing state, and is high. It can be seen that it has optical performance.

(第4実施例)
図10(a)、図10(b)、及び図10(c)はそれぞれ、本願の第4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、及び望遠端状態における断面図である。
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、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4と、負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。第2レンズ群G2と第3レンズ群G3との間には、開口絞りSが備えられている。
(Fourth embodiment)
FIGS. 10A, 10B, and 10C are cross-sectional views of the zoom optical system according to the fourth example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. It is.
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, and a third lens having a positive refractive power. The lens group G3 includes a fourth lens group G4 having a positive refractive power and a fifth lens group G5 having a negative refractive power. An aperture stop S is provided between the second lens group G2 and the third lens group G3.

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。
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との接合レンズとからなる。なお、負メニスカスレンズL21は物体側のレンズ面を非球面形状としたガラスモールド非球面レンズである。
The first lens group G1 includes, in order from the object side, a cemented lens 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. Become.
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. The cemented lens. The negative meniscus lens L21 is a glass mold aspheric lens having an aspheric lens surface on the object side.

第3レンズ群G3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L31と両凸形状の正レンズL32との接合レンズからなる。
第4レンズ群G4は、物体側から順に、物体側に凸面を向けた正メニスカスレンズL41と物体側に凸面を向けた負メニスカスレンズL42との接合レンズと、両凸形状の正レンズL43と物体側に凹面を向けた負メニスカスレンズL44との接合レンズと、物体側に凸面を向けた負メニスカスレンズL45と、両凸形状の正レンズL46と物体側に凹面を向けた負メニスカスレンズL47との接合レンズとからなる。なお、負メニスカスレンズL45は物体側のレンズ面を非球面形状としたガラスモールド非球面レンズであり、負メニスカスレンズL47は像側のレンズ面を非球面形状としたガラスモールド非球面レンズである。
The third lens group G3 is composed of a cemented lens of a negative meniscus lens L31 having a convex surface directed toward the object side and a biconvex positive lens L32 in order from the object side.
In order from the object side, the fourth lens group G4 includes a cemented lens of a positive meniscus lens L41 having a convex surface directed toward the object side and a negative meniscus lens L42 having a convex surface directed toward the object side, a biconvex positive lens L43, and an object. A cemented lens with a negative meniscus lens L44 having a concave surface on the side, a negative meniscus lens L45 having a convex surface on the object side, a positive lens L46 having a biconvex shape, and a negative meniscus lens L47 having a concave surface on the object side It consists of a cemented lens. The negative meniscus lens L45 is a glass mold aspheric lens having an aspheric lens surface on the object side, and the negative meniscus lens L47 is a glass mold aspheric lens having an aspheric lens surface on the image side.

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と物体側に凹面を向けた負メニスカスレンズL52との接合レンズからなる。なお、負メニスカスレンズL52は像側のレンズ面を非球面形状としたガラスモールド非球面レンズである。   The fifth lens group G5 includes, in order from the object side, a cemented lens including a positive meniscus lens L51 having a concave surface facing the object side and a negative meniscus lens L52 having a concave surface facing the object side. The negative meniscus lens L52 is a glass mold aspheric lens having an aspheric lens surface on the image side.

以上の構成の下、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との空気間隔、第2レンズ群G2と第3レンズ群G3との空気間隔、第3レンズ群G3と第4レンズ群G4との空気間隔、第4レンズ群G4と第5レンズ群G5との空気間隔、及び第5レンズ群G5と像面Iとの空気間隔がそれぞれ変化するように、第1レンズ群G1〜第5レンズ群G5が光軸に沿って移動する。
詳細には、第1レンズ群G1〜第5レンズ群G5が物体側へ移動する。なお、開口絞りSは変倍時に第4レンズ群G4と一体的に物体側へ移動する。
また、無限遠物体から近距離物体への合焦は、第3レンズ群G3を光軸に沿って像面I側に移動させることで行う。
With the above-described configuration, 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 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state. The air gap between G2 and the third lens group G3, the air gap between the third lens group G3 and the fourth lens group G4, the air gap between the fourth lens group G4 and the fifth lens group G5, and the fifth lens group G5 The first lens group G1 to the fifth lens group G5 move along the optical axis so that the air spacing between the lens surface and the image plane I changes.
Specifically, the first lens group G1 to the fifth lens group G5 move to the object side. The aperture stop S moves to the object side integrally with the fourth lens group G4 during zooming.
Further, focusing from an infinitely distant object to a close object is performed by moving the third lens group G3 to the image plane I side along the optical axis.

これにより、変倍時に、第1レンズ群G1と第2レンズ群G2との空気間隔が増加し、第2レンズ群G2と第3レンズ群G3との空気間隔が減少し、第4レンズ群G4と第5レンズ群G5との空気間隔が増加し、第5レンズ群G5と像面Iとの空気間隔が増加する。第3レンズ群G3と第4レンズ群G4との空気間隔は、広角端状態から中間焦点距離状態まで減少し、中間焦点距離状態から望遠端状態まで増加する。なお、変倍時に開口絞りSと第3レンズ群G3との空気間隔は、広角端状態から中間焦点距離状態まで増加し、中間焦点距離状態から望遠端状態まで減少する。
これらにより、本実施例に係る変倍光学系は、高変倍率を有し、且つ小型に構成されている。
以下の表4に、本実施例に係る変倍光学系の諸元の値を掲げる。
Thereby, at the time of zooming, the air gap between the first lens group G1 and the second lens group G2 increases, the air gap between the second lens group G2 and the third lens group G3 decreases, and the fourth lens group G4. And the fifth lens group G5 increase, and the air distance between the fifth lens group G5 and the image plane I increases. The air space between the third lens group G3 and the fourth lens group G4 decreases from the wide-angle end state to the intermediate focal length state, and increases from the intermediate focal length state to the telephoto end state. At the time of zooming, the air gap between the aperture stop S and the third lens group G3 increases from the wide-angle end state to the intermediate focal length state and decreases from the intermediate focal length state to the telephoto end state.
Accordingly, the variable magnification optical system according to the present embodiment has a high variable magnification and is configured in a small size.
Table 4 below lists values of specifications of the variable magnification optical system according to the present example.

(表4)第4実施例
[面データ]
面番号 r d nd νd
物面 ∞

1 128.6583 1.6350 1.950000 29.37
2 43.3153 8.5924 1.497820 82.57
3 -200.5952 0.1000
4 41.6932 4.9416 1.816000 46.59
5 226.2028 可変

*6 500.0000 1.0000 1.851348 40.10
7 9.4698 3.7102
8 -51.4849 1.0000 1.883000 40.66
9 32.3052 0.4591
10 17.6836 4.3937 1.808090 22.74
11 -11.5727 1.0000 1.902650 35.72
12 68.1728 可変

13(絞りS) ∞ 可変

14 23.9084 1.0000 1.883000 40.66
15 12.0540 3.5286 1.593190 67.90
16 -41.2723 可変

17 13.3372 7.1262 1.816000 46.59
18 23.6925 1.0000 1.850260 32.35
19 10.6208 2.0000
20 22.6183 3.2312 1.516800 63.88
21 -10.6478 1.0000 1.850260 32.35
22 -17.8847 1.5000
*23 88.9298 1.0000 1.806100 40.73
24 14.7135 3.2670
25 17.6589 5.9445 1.567320 42.58
26 -8.0000 1.0000 1.851348 40.10
*27 -23.1716 可変

28 -86.3077 1.3257 1.497820 82.57
29 -40.4370 1.0000 1.834410 37.28
*30 -70.0000 BF

像面 ∞

[非球面データ]
第6面
κ 11.00000
A4 2.16452E-05
A6 -6.30268E-08
A8 -2.73814E-09
A10 5.05766E-11
A12 -2.61890E-13

第23面
κ 1.00000
A4 -2.28843E-05
A6 8.75761E-07
A8 -2.20702E-08
A10 4.21746E-10
A12 0.00000E+00

第27面
κ 1.00000
A4 -8.32547E-05
A6 -6.55824E-08
A8 1.23463E-09
A10 -5.63694E-11
A12 0.00000E+00

第30面
κ 1.00000
A4 3.80084E-05
A6 -2.56034E-08
A8 4.99788E-11
A10 0.00000E+00
A12 0.00000E+00

[各種データ]
変倍比 14.13

W T
f 10.30 〜 145.50
FNO 4.12 〜 5.85
ω 39.50 〜 3.03°
Y 8.00 〜 8.00
TL 107.35 〜 157.35

W M T
f 10.30000 59.49985 145.49848
ω 39.49758 7.41063 3.03486
FNO 4.12 5.76 5.85
φ 8.71 8.62 10.14
d5 2.10000 32.37072 41.89456
d12 22.31334 6.07934 2.20000
d13 3.17825 4.10045 1.80000
d16 3.82220 2.90000 5.20045
d27 1.23135 12.66515 16.54997
BF 13.94909 25.45018 28.94846

[合焦時の合焦群移動量]
W M T
撮影倍率 -0.0100 -0.0100 -0.0100
撮影距離 1003.5628 5791.2514 14169.5696
移動量 0.1205 0.1520 0.2832

[レンズ群データ]
群 始面 f
1 1 63.10081
2 6 -8.44812
3 14 37.00000
4 17 42.46436
5 28 -485.09743

[条件式対応値]
(1)f3/fw = 3.592
(2)(d1it−d1iw)/fw = 4.854
(3)(d5it−d5iw)/(d3it−d3iw) = 0.473
(4)f3/f4 = 0.871
(Table 4) Fourth Example
[Surface data]
Surface number r d nd νd
Object ∞

1 128.6583 1.6350 1.950000 29.37
2 43.3153 8.5924 1.497820 82.57
3 -200.5952 0.1000
4 41.6932 4.9416 1.816000 46.59
5 226.2028 Variable

* 6 500.0000 1.0000 1.851348 40.10
7 9.4698 3.7102
8 -51.4849 1.0000 1.883000 40.66
9 32.3052 0.4591
10 17.6836 4.3937 1.808090 22.74
11 -11.5727 1.0000 1.902650 35.72
12 68.1728 Variable

13 (Aperture S) ∞ Variable

14 23.9084 1.0000 1.883000 40.66
15 12.0540 3.5286 1.593190 67.90
16 -41.2723 Variable

17 13.3372 7.1262 1.816000 46.59
18 23.6925 1.0000 1.850260 32.35
19 10.6208 2.0000
20 22.6183 3.2312 1.516800 63.88
21 -10.6478 1.0000 1.850260 32.35
22 -17.8847 1.5000
* 23 88.9298 1.0000 1.806100 40.73
24 14.7135 3.2670
25 17.6589 5.9445 1.567320 42.58
26 -8.0000 1.0000 1.851348 40.10
* 27 -23.1716 Variable

28 -86.3077 1.3257 1.497820 82.57
29 -40.4370 1.0000 1.834410 37.28
* 30 -70.0000 BF

Image plane ∞

[Aspherical data]
6th surface κ 11.00000
A4 2.16452E-05
A6 -6.30268E-08
A8 -2.73814E-09
A10 5.05766E-11
A12 -2.61890E-13

23rd surface κ 1.00000
A4 -2.28843E-05
A6 8.75761E-07
A8 -2.20702E-08
A10 4.21746E-10
A12 0.00000E + 00

27th surface κ 1.00000
A4 -8.32547E-05
A6 -6.55824E-08
A8 1.23463E-09
A10 -5.63694E-11
A12 0.00000E + 00

30th surface κ 1.00000
A4 3.80084E-05
A6 -2.56034E-08
A8 4.99788E-11
A10 0.00000E + 00
A12 0.00000E + 00

[Various data]
Scaling ratio 14.13

W T
f 10.30 to 145.50
FNO 4.12 to 5.85
ω 39.50 to 3.03 °
Y 8.00-8.00
TL 107.35-157.35

W M T
f 10.30000 59.49985 145.49848
ω 39.49758 7.41063 3.03486
FNO 4.12 5.76 5.85
φ 8.71 8.62 10.14
d5 2.10000 32.37072 41.89456
d12 22.31334 6.07934 2.20000
d13 3.17825 4.10045 1.80000
d16 3.82220 2.90000 5.20045
d27 1.23135 12.66515 16.54997
BF 13.94909 25.45018 28.94846

[Focus group movement during focusing]
W M T
Shooting magnification -0.0100 -0.0100 -0.0100
Shooting distance 1003.5628 5791.2514 14169.5696
Travel 0.1205 0.1520 0.2832

[Lens group data]
Group start surface f
1 1 63.10081
2 6 -8.44812
3 14 37.00000
4 17 42.46436
5 28 -485.09743

[Conditional expression values]
(1) f3 / fw = 3.592
(2) (d1it−d1iw) /fw=4.854
(3) (d5it-d5iw) / (d3it-d3iw) = 0.473
(4) f3 / f4 = 0.871

図11(a)、図11(b)、及び図11(c)はそれぞれ、本願の第4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、及び望遠端状態における無限遠物体合焦時の諸収差図である。
図12(a)、図12(b)、及び図12(c)はそれぞれ、本願の第4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、及び望遠端状態における近距離物体合焦時(撮影倍率-0.0100倍)の諸収差図である。
11 (a), 11 (b), and 11 (c) respectively show infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the fourth example of the present application. It is an aberration diagram at the time of focusing on an object.
12 (a), 12 (b), and 12 (c) are short distances 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 fourth example of the present application, respectively. FIG. 6 is a diagram showing various aberrations when the object is in focus (imaging magnification: -0.0100 times).

各収差図より、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、また、無限遠物体合焦状態から近距離物体合焦状態まで諸収差が良好に補正され、高い光学性能を有していることがわかる。   From the respective aberration diagrams, the variable magnification optical system according to the present embodiment has various aberrations well corrected from the wide-angle end state to the telephoto end state, and from the infinite object focusing state to the short-distance object focusing state, and is high. It can be seen that it has optical performance.

上記各実施例によれば、高変倍比を有し、小型で、高い光学性能を有する変倍光学系を実現することができる。
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。
According to each of the above embodiments, a variable power optical system having a high zoom ratio, a small size, and high optical performance can be realized.
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 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、無限遠物体から近距離物体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。本願の変倍光学系では第3レンズ群全体を合焦レンズ群とする例を示したが、第1レンズ群の少なくとも一部又は第2レンズ群の少なくとも一部又は第3レンズ群の少なくとも一部又は第4レンズ群の少なくとも一部又は第5レンズ群の少なくとも一部又はそれらの組合せで合焦レンズ群とすることも可能である。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 uses a part of a lens group, an entire lens group, or a plurality of lens groups as a focusing lens group for focusing from an object at infinity to a near object. It is good also as a structure moved to an axial direction. In the variable magnification optical system of the present application, an example in which the entire third lens group is the focusing lens group has been shown, but at least a part of the first lens group, at least a part of the second lens group, or at least one of the third lens group. It is also possible to form the focusing lens group by at least a part of the fourth lens group, at least a part of the fifth lens group, or a combination thereof. 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、いずれかのレンズ群全体又はその一部を、防振レンズ群として光軸に対して垂直な方向の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)させることにより、手ぶれ等によって生じる像ぶれを補正する構成とすることもできる。特に、本願の変倍光学系では第2レンズ群の少なくとも一部又は第3レンズ群の少なくとも一部又は第4レンズ群の少なくとも一部又は第5レンズ群の少なくとも一部を防振レンズ群とすることが好ましい。   Further, in the variable magnification optical system of the present application, any lens group or a part thereof is moved as a vibration-proof lens group so as to include a component in a direction perpendicular to the optical axis, or a surface including the optical axis A configuration in which image blur caused by camera shake or the like is corrected by rotationally moving (swinging) inward is also possible. In particular, in the variable magnification optical system of the present application, at least a part of the second lens group, at least a part of the third lens group, at least a part of the fourth lens group, or at least a part of the fifth lens group is defined as an anti-vibration lens group. It is preferable to do.

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レンズ群の近傍に配置されているが、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。
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。
In the variable magnification optical system of the present application, the aperture stop is 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.
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13に基づいて説明する。
図13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。
図13に示すようにカメラ1は、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。
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)を介して撮像部3の撮像面上に被写体像を形成する。そして、撮像部3に設けられた光電変換素子によって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。
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、撮像部3で生成された被写体の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。
Next, a camera equipped with the variable magnification optical system of the present application will be described with reference to FIG.
FIG. 13 is a diagram illustrating a configuration of a camera including the variable magnification optical system of the present application.
As shown in FIG. 13, the camera 1 is a so-called mirrorless camera of an interchangeable lens type that includes the variable magnification optical system according to the first example as the photographing lens 2.
In the camera 1, light from an object (subject) (not shown) is collected by the photographing lens 2 and is on the imaging surface of the imaging unit 3 via an OLPF (Optical low pass filter) (not shown). A subject image is formed on the screen. Then, the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate an image of the subject. This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1. Thus, the photographer can observe the subject via the EVF 4.
When the release button (not shown) is pressed by the photographer, the subject image generated by the imaging unit 3 is stored in a memory (not shown). In this way, the photographer can shoot the subject with the camera 1.

ここで、本カメラ1に撮影レンズ2として搭載した上記第1実施例に係る変倍光学系は、高変倍比を有し、小型で、高い光学性能を有する変倍光学系である。したがって本カメラ1は、高変倍比を有しつつ、小型化と高い光学性能を実現することができる。なお、上記第2〜第4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。また、クイックリターンミラーを有し、ファインダ光学系によって被写体を観察する一眼レフタイプのカメラに上記各実施例に係る変倍光学系を搭載した場合でも、上記カメラ1と同様の効果を奏することができる。   Here, the zoom optical system according to the first embodiment mounted as the photographing lens 2 on the camera 1 is a zoom optical system having a high zoom ratio, a small size, and high optical performance. Therefore, the present camera 1 can achieve downsizing and high optical performance while having a high zoom ratio. Even if a camera equipped with the variable magnification optical system according to the second to fourth examples as the photographing lens 2 is configured, the same effect as the camera 1 can be obtained. Further, even when the variable magnification optical system according to each of the above embodiments is mounted on a single-lens reflex camera that has a quick return mirror and observes a subject with a finder optical system, the same effect as the camera 1 can be obtained. it can.

最後に、本願の変倍光学系の製造方法の概略を図14に基づいて説明する。
図14に示す本願の変倍光学系の製造方法は、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、正の屈折力を有する第4レンズ群と、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、S2、S3を含むものである。
Finally, the outline of the manufacturing method of the variable magnification optical system of this application is demonstrated based on FIG.
The variable power optical system manufacturing method shown in FIG. 14 has, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power. A method for manufacturing a variable magnification optical system having a third lens group, a fourth lens group having a positive refractive power, and a fifth lens group, and includes the following steps S1, S2, and S3.

ステップS1:第3レンズ群が以下の条件式(1)を満足するようにし、各レンズ群をレンズ鏡筒内に物体側から順に配置する。
(1) 2.970 < f3/fw < 10.000
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3レンズ群の焦点距離
Step S1: The third lens group is made to satisfy the following conditional expression (1), and each lens group is sequentially arranged in the lens barrel from the object side.
(1) 2.970 <f3 / fw <10.000
However,
fw: focal length of the entire zoom optical system in the wide-angle end state f3: focal length of the third lens group

ステップS2:レンズ鏡筒に公知の移動機構を設ける等することで、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レンズ群との間隔と、第2レンズ群と第3レンズ群との間隔と、第3レンズ群と第4レンズ群との間隔と、第4レンズ群と第5レンズ群との間隔とが変化するようにし、第5レンズ群が像面に対して移動するようにする。
ステップS3:レンズ鏡筒に公知の移動機構を設ける等することで、無限遠物体から近距離物体への合焦時に、第3レンズ群が光軸に沿って移動するようにする。
Step S2: By providing a known moving mechanism in the lens barrel, the magnification between the wide-angle end state and the telephoto end state, the distance between the first lens group and the second lens group, the second lens group, The distance between the third lens group, the distance between the third lens group and the fourth lens group, and the distance between the fourth lens group and the fifth lens group are changed, and the fifth lens group is placed on the image plane. To move against.
Step S3: A known moving mechanism is provided on the lens barrel so that the third lens group moves along the optical axis when focusing from an object at infinity to an object at a short distance.

斯かる本願の変倍光学系の製造方法によれば、高変倍比を有し、小型で、高い光学性能を有する変倍光学系を製造することができる。   According to such a method for manufacturing a variable magnification optical system of the present application, a variable magnification optical system having a high zoom ratio, a small size, and high optical performance can be manufactured.

G1 第1レンズ群
G2 第2レンズ群
G3 第3レンズ群
G4 第4レンズ群
G5 第5レンズ群
S 開口絞り
I 像面
G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G5 5th lens group S Aperture stop I Image surface

Claims (10)

光軸に沿って物体側から順に、正屈折力の第1レンズ群と、負屈折力の第2レンズ群と、正屈折力の第3レンズ群と、正屈折力の第4レンズ群と、第5レンズ群とにより実質的に5個のレンズ群からなり、
開口絞りを有し、
広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔とが変化し、前記第5レンズ群は像面に対して移動し、前記開口絞りと前記第4レンズ群との距離が不変であり、
無限遠物体から近距離物体への合焦時に、前記第3レンズ群は光軸に沿って移動し、
以下の条件式を満足することを特徴とする変倍光学系。
2.970 < f3/fw < 10.000
2.700 < (d1it−d1iw)/fw < 10.000
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3レンズ群の焦点距離
d1it:望遠端状態における前記第1レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d1iw:広角端状態における前記第1レンズ群の最も像側のレンズ面から像面までの光軸上の距離
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, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power; The fifth lens group substantially consists of five lens groups,
Having an aperture stop,
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, the distance between the second lens group and the third lens group, and the third lens group And the fourth lens group and the distance between the fourth lens group and the fifth lens group change, the fifth lens group moves relative to the image plane, and the aperture stop and the fourth lens group move. The distance to the 4 lens group is unchanged,
When focusing from an object at infinity to a near object, the third lens group moves along the optical axis;
A zoom optical system characterized by satisfying the following conditional expression:
2.970 <f3 / fw <10.000
2.700 <(d1it-d1iw) / fw <10.000
However,
fw: focal length of the entire zoom optical system in the wide-angle end state f3: focal length of the third lens group
d1it: distance on the optical axis from the lens surface closest to the image side of the first lens group in the telephoto end state to the image surface
d1iw: Distance on the optical axis from the lens surface closest to the image side of the first lens group in the wide-angle end state to the image plane
光軸に沿って物体側から順に、正屈折力の第1レンズ群と、負屈折力の第2レンズ群と、正屈折力の第3レンズ群と、正屈折力の第4レンズ群と、第5レンズ群とにより実質的に5個のレンズ群からなり、
開口絞りを有し、
広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔とが変化し、前記第5レンズ群は像面に対して移動し、前記開口絞りと前記第4レンズ群との距離が不変であり、
無限遠物体から近距離物体への合焦時に、前記第3レンズ群は光軸に沿って移動し、
以下の条件式を満足することを特徴とする変倍光学系。
2.970 < f3/fw < 10.000
0.300 < f3/f4 < 1.500
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3レンズ群の焦点距離
f4:前記第4レンズ群の焦点距離
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, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power; The fifth lens group substantially consists of five lens groups,
Having an aperture stop,
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, the distance between the second lens group and the third lens group, and the third lens group And the fourth lens group and the distance between the fourth lens group and the fifth lens group change, the fifth lens group moves relative to the image plane, and the aperture stop and the fourth lens group move. The distance to the 4 lens group is unchanged,
When focusing from an object at infinity to a near object, the third lens group moves along the optical axis;
A zoom optical system characterized by satisfying the following conditional expression:
2.970 <f3 / fw <10.000
0.300 <f3 / f4 <1.500
However,
fw: focal length of the entire zoom optical system in the wide-angle end state f3: focal length of the third lens group
f4: focal length of the fourth lens group
光軸に沿って物体側から順に、正屈折力の第1レンズ群と、負屈折力の第2レンズ群と、正屈折力の第3レンズ群と、正屈折力の第4レンズ群と、第5レンズ群とにより実質的に5個のレンズ群からなり、
開口絞りを有し、
広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔とが変化し、前記第5レンズ群は像面に対して移動し、前記開口絞りと前記第4レンズ群との距離が不変であり、
無限遠物体から近距離物体への合焦時に、前記第3レンズ群は光軸に沿って移動し、
以下の条件式を満足することを特徴とする変倍光学系。
3.592 ≦ f3/fw < 10.000
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3レンズ群の焦点距離
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, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power; The fifth lens group substantially consists of five lens groups,
Having an aperture stop,
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, the distance between the second lens group and the third lens group, and the third lens group And the fourth lens group and the distance between the fourth lens group and the fifth lens group change, the fifth lens group moves relative to the image plane, and the aperture stop and the fourth lens group move. The distance to the 4 lens group is unchanged,
When focusing from an object at infinity to a near object, the third lens group moves along the optical axis;
A zoom optical system characterized by satisfying the following conditional expression:
3.592 ≦ f3 / fw <10.000
However,
fw: focal length of the entire zoom optical system in the wide-angle end state f3: focal length of the third lens group
光軸に沿って物体側から順に、正屈折力の第1レンズ群と、負屈折力の第2レンズ群と、正屈折力の第3レンズ群と、正屈折力の第4レンズ群と、第5レンズ群とにより実質的に5個のレンズ群からなり、
開口絞りを有し、
広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔と、前記第2レンズ群と前記第3レンズ群との間隔と、前記第3レンズ群と前記第4レンズ群との間隔と、前記第4レンズ群と前記第5レンズ群との間隔とが変化し、前記第5レンズ群は像面に対して移動し、前記開口絞りと前記第4レンズ群との距離が不変であり、
無限遠物体から近距離物体への合焦時に、前記第3レンズ群は光軸に沿って移動し、
以下の条件式を満足することを特徴とする変倍光学系。
2.970 < f3/fw < 10.000
0.010 <(d5it−d5iw)/(d3it−d3iw)< 1.000
但し、
fw:広角端状態における前記変倍光学系の全系の焦点距離
f3:前記第3レンズ群の焦点距離
d3it:望遠端状態における前記第3レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d3iw:広角端状態における前記第3レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d5it:望遠端状態における前記第5レンズ群の最も像側のレンズ面から像面までの光軸上の距離
d5iw:広角端状態における前記第5レンズ群の最も像側のレンズ面から像面までの光軸上の距離
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, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power; The fifth lens group substantially consists of five lens groups,
Having an aperture stop,
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, the distance between the second lens group and the third lens group, and the third lens group And the fourth lens group and the distance between the fourth lens group and the fifth lens group change, the fifth lens group moves relative to the image plane, and the aperture stop and the fourth lens group move. The distance to the 4 lens group is unchanged,
When focusing from an object at infinity to a near object, the third lens group moves along the optical axis;
A zoom optical system characterized by satisfying the following conditional expression:
2.970 <f3 / fw <10.000
0.010 <(d5it-d5iw) / (d3it-d3iw) <1.00
However,
fw: focal length of the entire zoom optical system in the wide-angle end state f3: focal length of the third lens group
d3it: the distance on the optical axis from the most image side lens surface of the third lens group to the image surface in the telephoto end state
d3iw: distance on the optical axis from the lens surface closest to the image side of the third lens group in the wide-angle end state to the image surface
d5it: distance on the optical axis from the most image side lens surface of the fifth lens group to the image surface in the telephoto end state
d5iw: Distance on the optical axis from the lens surface closest to the image side of the fifth lens group in the wide-angle end state to the image surface
広角端状態から望遠端状態への変倍時に、前記第1レンズ群は物体側へ移動することを特徴とする請求項1から4のいずれか一項に記載の変倍光学系。 Upon zooming from the wide-angle end state to the telephoto end state, the variable magnification optical system according to claim 1, any one of 4 to the first lens group is thus being moved toward the object side. 無限遠物体から近距離物体への合焦時に、前記第3レンズ群は像側へ移動することを特徴とする請求項1から5のいずれか一項に記載の変倍光学系。   6. The variable magnification optical system according to claim 1, wherein the third lens unit moves toward the image side when focusing from an object at infinity to an object at a short distance. 広角端状態から望遠端状態への変倍時に、前記第1レンズ群と前記第2レンズ群との間隔が増加することを特徴とする請求項1から6のいずれか一項に記載の変倍光学系。   The zooming according to any one of claims 1 to 6, wherein an interval between the first lens group and the second lens group is increased when zooming from the wide-angle end state to the telephoto end state. Optical system. 広角端状態から望遠端状態への変倍時に、前記第2レンズ群と前記第3レンズ群との間隔が減少することを特徴とする請求項1から7のいずれか一項に記載の変倍光学系。   8. The zooming according to claim 1, wherein the distance between the second lens unit and the third lens unit decreases when zooming from the wide-angle end state to the telephoto end state. Optical system. 前記第5レンズ群は正の屈折力を有することを特徴とする請求項1から8のいずれか一項に記載の変倍光学系。   The variable power optical system according to claim 1, wherein the fifth lens group has a positive refractive power. 請求項1から9のいずれか一項に記載の変倍光学系を有することを特徴とする光学装置。   An optical apparatus comprising the variable magnification optical system according to claim 1.
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