JP6424414B2

JP6424414B2 - Variable magnification optical system, optical device

Info

Publication number: JP6424414B2
Application number: JP2012233962A
Authority: JP
Inventors: 昭彦小濱; 雅史山下
Original assignee: Nikon Corp
Current assignee: Nikon Corp
Priority date: 2012-10-23
Filing date: 2012-10-23
Publication date: 2018-11-21
Anticipated expiration: 2032-10-23
Also published as: JP2014085489A

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 device, and a method of 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（例えば、特許文献１を参照。）。 Heretofore, many variable magnification optical systems suitable for interchangeable lenses for cameras, digital cameras, video cameras and the like have been proposed in which the lens group on the most object side has positive refractive power (for example, Patent Document 1) reference.).

特開２０１０−２３７４５５号公報JP, 2010-237455, A

しかしながら、上述のような従来の変倍光学系は、小型化を図ろうとすれば、十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, in the conventional variable magnification optical system as described above, there is a problem that it is difficult to obtain sufficiently high optical performance if attempting to miniaturize.

そこで本発明は上記問題点に鑑みてなされたものであり、小型で、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。 Accordingly, the present invention has been made in view of the above problems, and has an object to provide a variable magnification optical system having a small size and high optical performance, an optical device, and a method of manufacturing the variable magnification optical system.

上記課題を解決するために本発明は、
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、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とにより、実質的に５個のレンズ群からなり、
前記第１レンズ群が３枚のレンズからなり、
広角端状態から望遠端状態への変倍時に、隣り合うレンズ群の間隔が変化し、
以下の条件式を満足するレンズを少なくとも１つ有し、
１．９２８＜ｎｄｈ
但し、
ｎｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対する屈折率
以下の条件式を満足し、
０．２２０＜（−ｆ２）／ｆ３＜０．５３０
６．６７ ≦ ｆ１／（−ｆ２）＜１５．００
但し、
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離
ｆ３：前記第３レンズ群の焦点距離
前記第１レンズ群が負の屈折力を有する前記レンズを少なくとも１つ有することを特徴とする変倍光学系を提供する。
また本発明は、
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、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とにより、実質的に５個のレンズ群からなり、
前記第１レンズ群が３枚のレンズからなり、
広角端状態から望遠端状態への変倍時に、隣り合うレンズ群の間隔が変化し、
以下の条件式を満足するレンズを少なくとも１つ有し、
１．９２８＜ｎｄｈ
但し、
ｎｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対する屈折率
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。
０．２２０＜（−ｆ２）／ｆ３＜０．５３０
２８．６０＜ νｄｈ
但し、
ｆ２：前記第２レンズ群の焦点距離
ｆ３：前記第３レンズ群の焦点距離
νｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対するアッベ数
また本発明は、
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、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とにより、実質的に５個のレンズ群からなり、
広角端状態から望遠端状態への変倍時に、隣り合うレンズ群の間隔が変化し、
以下の条件式を満足するレンズを少なくとも１つ有し、
１．９２８＜ｎｄｈ
但し、
ｎｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対する屈折率
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。
６．６７ ≦ ｆ１／（−ｆ２）＜１５．００
２８．６０＜ νｄｈ
但し、
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離
νｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対するアッベ数
また本発明は、
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、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とにより、実質的に５個のレンズ群からなり、
広角端状態から望遠端状態への変倍時に、隣り合うレンズ群の間隔が変化し、
以下の条件式を満足するレンズを少なくとも１つ有し、
１．９２８＜ｎｄｈ
但し、
ｎｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対する屈折率
前記第１レンズ群が前記レンズを少なくとも１つ有し、
以下の条件式を満足することを特徴とする変倍光学系を提供する。
２８．６０＜ νｄｈ
但し、
νｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対するアッベ数
また本発明は、
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、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とにより、実質的に５個のレンズ群からなり、
広角端状態から望遠端状態への変倍時に、隣り合うレンズ群の間隔が変化し、
以下の条件式を満足するレンズを少なくとも１つ有し、
１．９２８＜ｎｄｈ
但し、
ｎｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対する屈折率
以下の条件式を満足し、
２８．６０＜ νｄｈ
但し、
νｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対するアッベ数
前記第１レンズ群が以下の条件式を満足する前記レンズを少なくとも１つ有することを特徴とする変倍光学系を提供する。
０．４５０＜｜ｆｈ／ｆ１｜＜１．４００
但し、
ｆｈ：前記第１レンズ群中の前記レンズの焦点距離
ｆ１：前記第１レンズ群の焦点距離 In order to solve the above problems, the present invention is
From the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a negative refractive power And a fifth lens unit having a positive refractive power, the lens unit substantially including five lens units,
The first lens group consists of three lenses,
During zooming from the wide-angle end state to the telephoto end state, the distance between adjacent lens groups changes,
Have at least one lens that satisfies the following conditional expression,
1.928 <ndh
However,
ndh: the refractive index to the d-line (wavelength 587.6 nm) of the lens which satisfies the following conditional expression:
0.220 <(-f2) / f3 <0.530
6.67 ≦ f1 / (− f2) <15.00
However,
f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group The first lens group has at least one lens having negative refractive power The present invention provides a variable power optical system characterized by
The present invention
From the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a negative refractive power And a fifth lens unit having a positive refractive power, the lens unit substantially including five lens units,
The first lens group consists of three lenses,
During zooming from the wide-angle end state to the telephoto end state, the distance between adjacent lens groups changes,
Have at least one lens that satisfies the following conditional expression,
1.928 <ndh
However,
ndh: A variable magnification optical system characterized by satisfying the following conditional expression for the refractive index of the lens to the d line (wavelength 587.6 nm).
0.220 <(-f2) / f3 <0.530
28.60 <dhdh
However,
f2: focal length of the second lens group f3: focal length of the third lens group dh dh: Abbe number with respect to the d-line (wavelength 587.6 nm) of the lens
From the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a negative refractive power And a fifth lens unit having a positive refractive power, the lens unit substantially including five lens units,
During zooming from the wide-angle end state to the telephoto end state, the distance between adjacent lens groups changes,
Have at least one lens that satisfies the following conditional expression,
1.928 <ndh
However,
ndh: A variable magnification optical system characterized by satisfying the following conditional expression for the refractive index of the lens to the d line (wavelength 587.6 nm).
6.67 ≦ f1 / (− f2) <15.00
28.60 <dhdh
However,
f1: focal length of the first lens group f2: focal length of the second lens group dh dh: Abbe number with respect to the d-line of the lens (wavelength 587.6 nm)
From the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a negative refractive power And a fifth lens unit having a positive refractive power, the lens unit substantially including five lens units,
During zooming from the wide-angle end state to the telephoto end state, the distance between adjacent lens groups changes,
Have at least one lens that satisfies the following conditional expression,
1.928 <ndh
However,
ndh: refractive index to d-line (wavelength 587.6 nm) of the lens The first lens group includes at least one lens.
The present invention provides a variable magnification optical system characterized by satisfying the following conditional expression.
28.60 <dhdh
However,
dh dh: Abbe number of d-line (wavelength 587.6 nm) of the lens
From the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a negative refractive power And a fifth lens unit having a positive refractive power, the lens unit substantially including five lens units,
During zooming from the wide-angle end state to the telephoto end state, the distance between adjacent lens groups changes,
Have at least one lens that satisfies the following conditional expression,
1.928 <ndh
However,
ndh: the refractive index to the d-line (wavelength 587.6 nm) of the lens which satisfies the following conditional expression:
28.60 <dhdh
However,
dh dh: Abbe number of d-line (wavelength 587.6 nm) of the lens The variable-magnification optical system is characterized in that the first lens group has at least one lens satisfying the following conditional expression.
0.450 <| fh / f1 | <1.400
However,
fh: focal length of the lens in the first lens group f1: focal length of the first lens group

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
An optical apparatus comprising the variable magnification optical system is provided.

本発明によれば、小型で、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, it is possible to provide a variable magnification optical system having a small size and high optical performance, an optical device, and a method of manufacturing the variable magnification optical system.

（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 respectively sectional drawings in the wide-angle end state, an intermediate focal length state, and a telephoto end state 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) show various items 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 embodiment of the present application. FIG. （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 respectively sectional views in the wide-angle end state, an intermediate focal length state, and a telephoto end state of a variable magnification optical system according to a second example of the present application. （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) show various items at the time of focusing on an infinite object 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 embodiment of the present application, respectively. FIG. （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 respectively sectional views 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. （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) show various items at the time of focusing on an infinite object 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 embodiment of the present application. FIG. 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、物体側から順に、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、正の屈折力を有する第３レンズ群と、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とを有し、広角端状態から望遠端状態への変倍時に、前記第１レンズ群と前記第２レンズ群との間隔、前記第２レンズ群と前記第３レンズ群との間隔、前記第３レンズ群と前記第４レンズ群との間隔、及び前記第４レンズ群と前記第５レンズ群との間隔が変化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の変動や非点収差の変動を抑えることができる。 Hereinafter, the variable magnification optical system, the optical apparatus, and the method of manufacturing the variable magnification optical system according to the present application will be described.
The variable magnification optical system of the present application includes, in order from the object side, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power, and The first lens group and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state, and having a fourth lens group having a refractive power of The distance between the second 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 It is characterized by changing. With this configuration, the variable magnification optical system of the present application realizes zooming from the wide-angle end state to the telephoto end state, and can suppress variations in distortion and astigmatism caused by zooming.

また、本願の変倍光学系は、以下の条件式（１）を満足するレンズを少なくとも１つ有することを特徴としている。
（１）１．９２８＜ｎｄｈ
但し、
ｎｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対する屈折率 Further, the variable magnification optical system of the present application is characterized by having at least one lens satisfying the following conditional expression (1).
(1) 1.928 <ndh
However,
ndh: refractive index to the d-line (wavelength 587.6 nm) of the lens

条件式（１）は、前記レンズの最適な屈折率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、小型化を達成しつつ、変倍時に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。
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、変倍時に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することが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１．９４０とすることがより好ましい。
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２．８００とすることがより好ましい。本願の変倍光学系の条件式（１）の対応値が２．８００より小さくなることにより、前記レンズの材料に対する可視光線の透過率を十分に確保することができる。
以上の構成により、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。 Conditional expression (1) defines the optimum refractive index of the lens. By satisfying the conditional expression (1), the variable magnification optical system according to the present application can achieve downsizing while suppressing fluctuations of spherical aberration and astigmatism during zooming.
When the corresponding value of the conditional expression (1) of the variable magnification optical system of the present application falls below the lower limit value, it becomes difficult to suppress the variation of spherical aberration and the variation of astigmatism at the time of zooming and realizes high optical performance. Will not be able to In order to further ensure the effect of the present application, it is more preferable to set the lower limit value of conditional expression (1) to 1.940.
In order to make the effect of the present invention more reliable, it is more preferable to set the upper limit value of the conditional expression (1) to 2.800. When the corresponding value of the conditional expression (1) of the variable magnification optical system of the present application is smaller than 2.800, the visible light transmittance of the material of the lens can be sufficiently secured.
With the above configuration, it is possible to realize a compact variable power optical system having high optical performance.

また本願の変倍光学系は、前記第１レンズ群が前記レンズを少なくとも１つ有することが望ましい。この構成により、変倍時に第１レンズ群で発生する球面収差、非点収差、軸上色収差、及び倍率色収差のそれぞれの変動を抑えることができる。 In the zoom lens system according to the present application, it is preferable that the first lens group has at least one lens. With this configuration, it is possible to suppress the respective variations of spherical aberration, astigmatism, axial chromatic aberration, and lateral chromatic aberration that occur in the first lens unit during zooming.

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）５．５０＜ｆ１／（−ｆ２）＜１５．００
但し、
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離 Further, it is desirable that the variable magnification optical system of the present application satisfy the following conditional expression (2).
(2) 5.50 <f1 / (− f2) <15.00
However,
f1: focal length of the first lens group f2: focal length of the second lens group

条件式（２）は、第１レンズ群と第２レンズ群の焦点距離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（２）を満足することにより、高変倍比を維持しつつ変倍時に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、広角端状態において非点収差が大きく発生し、高い光学性能を実現することが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５．６０とすることがより好ましい。また、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５．９０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、変倍時に第２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になってしまう。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１１．５０とすることがより好ましい。また、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１０．２０とすることがより好ましい。 Conditional expression (2) defines an appropriate range of the focal length ratio of the first lens group and the second lens group. By satisfying the conditional expression (2), the variable magnification optical system according to the present application can suppress variation in astigmatism at the time of variable power while maintaining a high zoom ratio.
When the corresponding value of the conditional expression (2) of the variable magnification optical system of the present application falls below the lower limit value, astigmatism is largely generated at the wide angle end state, and high optical performance can not be realized. In order to further ensure the effect of the present application, it is more preferable to set the lower limit value of conditional expression (2) to 5.60. Moreover, in order to make the effect of this application more reliable, it is more preferable to set the lower limit of conditional expression (2) to 5.90.
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, it becomes difficult to suppress the fluctuation of astigmatism generated in the second lens unit at the time of zooming. In order to make the effect of the present invention more reliable, it is more preferable to set the upper limit value of the conditional expression (2) to 11.50. Moreover, in order to make the effect of this application more reliable, it is more preferable to set the upper limit of conditional expression (2) to 10.20.

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）０．２２０＜（−ｆ２）／ｆ３＜０．５３０
但し、
ｆ２：前記第２レンズ群の焦点距離
ｆ３：前記第３レンズ群の焦点距離 Further, it is desirable that the variable magnification optical system of the present application satisfy the following conditional expression (3).
(3) 0.220 <(-f2) / f3 <0.530
However,
f2: focal length of the second lens group f3: focal length of the third lens group

条件式（３）は、第２レンズ群と第３レンズ群の焦点距離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、高変倍比を維持しつつ変倍時に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。
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、変倍時に第２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になってしまう。なお、本願の効果をより確実にするために、条件式（３）の下限値を０．２７０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球面収差の変動を抑えることが困難になってしまう。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０．４９０とすることがより好ましい。さらに、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０．４５０とすることがより好ましい。 Conditional expression (3) defines an appropriate range of the focal length ratio of the second lens group and the third lens group. By satisfying the conditional expression (3), the variable magnification optical system according to the present application can suppress the fluctuation of spherical aberration and the fluctuation of astigmatism during zooming while maintaining a high zooming ratio.
When the corresponding value of the conditional expression (3) of the variable magnification optical system of the present application falls below the lower limit value, it becomes difficult to suppress the fluctuation of astigmatism generated in the second lens unit at the time of zooming. In order to make the effect of the present invention more reliable, it is more preferable to set the lower limit value of the conditional expression (3) to 0.270.
On the other hand, when the corresponding value of the conditional expression (3) of the variable magnification optical system of the present application exceeds the upper limit value, it becomes difficult to suppress the variation of the spherical aberration generated in the third lens unit at the time of zooming. In order to make the effect of the present invention more reliable, it is more preferable to set the upper limit of conditional expression (3) to 0.490. Furthermore, in order to make the effect of the present invention more reliable, it is more preferable to set the upper limit value of conditional expression (3) to 0.450.

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）２８．６０＜ νｄｈ
但し、
νｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対するアッベ数 Further, it is desirable that the variable magnification optical system of the present application satisfy the following conditional expression (4).
(4) 28.60 <dhdh
However,
dh dh: Abbe number for d-line (wavelength 587.6 nm) of the lens

条件式（４）は、前記レンズの最適なアッベ数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、小型化を達成しつつ、変倍時に軸上色収差の変動や倍率色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、変倍時に軸上色収差の変動や倍率色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することが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２９．００とすることがより好ましい。また、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３０．００とすることがより好ましい。また、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３２．００とすることがより好ましい。
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５０．００とすることがより好ましい。本願の変倍光学系の条件式（４）の対応値が５０．００より小さくなることにより、変倍時に前記レンズ以外のレンズで発生する軸上色収差の変動や倍率色収差の変動を抑えることができ、高い光学性能を実現することができる。 Conditional expression (4) defines an optimal Abbe number of the lens. By satisfying the conditional expression (4), the variable magnification optical system according to the present application can achieve downsizing while suppressing fluctuation of axial chromatic aberration and fluctuation of lateral chromatic aberration during zooming.
When the corresponding value of the conditional expression (4) of the variable magnification optical system of the present application falls below the lower limit value, it becomes difficult to suppress the fluctuation of axial chromatic aberration and the magnification chromatic aberration during zooming, and realizes high optical performance. Will not be able to In order to further ensure the effect of the present application, it is more preferable to set the lower limit value of conditional expression (4) to 29.00. Moreover, in order to make the effect of this application more reliable, it is more preferable to set the lower limit of conditional expression (4) to 30.00. Moreover, in order to make the effect of this application more reliable, it is more preferable to set the lower limit of conditional expression (4) to 32.00.
In order to further ensure the effect of the present application, it is more preferable to set the upper limit value of conditional expression (4) to 50.00. When the corresponding value of the conditional expression (4) of the variable magnification optical system of the present application is smaller than 50.00, it is possible to suppress the fluctuation of the axial chromatic aberration and the fluctuation of the magnification chromatic aberration which occur in lenses other than the lens at the time of zooming. It is possible to realize high optical performance.

また本願の変倍光学系は、前記第１レンズ群が以下の条件式（５）を満足する前記レンズを少なくとも１つ有することが望ましい。
（５）０．４５０＜｜ｆｈ／ｆ１｜＜１．４００
但し、
ｆｈ：前記第１レンズ群中の前記レンズの焦点距離
ｆ１：前記第１レンズ群の焦点距離 In the zoom lens system according to the present application, it is preferable that the first lens group includes at least one lens satisfying the following conditional expression (5).
(5) 0.450 <| fh / f1 | <1.400
However,
fh: focal length of the lens in the first lens group f1: focal length of the first lens group

条件式（５）は、第１レンズ群中の前記レンズの最適な焦点距離範囲を規定するものである。なお、前記レンズが他のレンズと接合されている場合、ｆｈは前記レンズ単体の焦点距離を表す。本願の変倍光学系は、条件式（５）を満足することにより、変倍時に球面収差、非点収差、軸上色収差、及び倍率色収差のそれぞれの変動を抑えることができる。 Conditional expression (5) defines the optimum focal length range of the lens in the first lens group. When the lens is cemented with another lens, fh represents the focal length of the single lens. By satisfying the conditional expression (5), the variable magnification optical system according to the present application can suppress variations in spherical aberration, astigmatism, axial chromatic aberration, and lateral chromatic aberration at the time of zooming.

ここで、条件式（５）について、前記レンズが正の屈折力を有する場合と負の屈折力を有する場合に分けて説明する。
前記レンズが正の屈折力を有する場合、本願の変倍光学系の条件式（５）の対応値が下限値を下回ると、変倍時に前記レンズで発生する軸上色収差の変動や倍率色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することができなくなってしまう。一方、本願の変倍光学系の条件式（５）の対応値が上限値を上回ると、望遠端状態において第２レンズ群で発生する正の球面収差を抑えることが困難になり、高い光学性能を実現することができなくなってしまう。 Here, conditional expression (5) will be described separately for the case where the lens has positive refractive power and the case where the lens has negative refractive power.
When the lens has positive refractive power, if the corresponding value of the conditional expression (5) of the variable magnification optical system of the present application falls below the lower limit value, fluctuation of axial chromatic aberration or magnification chromatic aberration generated at the lens during zooming It becomes difficult to suppress the fluctuation, and it becomes impossible to realize high optical performance. On the other hand, when the corresponding value of conditional expression (5) of the variable magnification optical system of the present application exceeds the upper limit, it becomes difficult to suppress positive spherical aberration generated in the second lens group in the telephoto end state, and high optical performance Can not be realized.

前記レンズが負の屈折力を有する場合、本願の変倍光学系の条件式（５）の対応値が下限値を下回ると、変倍時に前記レンズで発生する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することができなくなってしまう。一方、本願の変倍光学系の条件式（５）の対応値が上限値を上回ると、変倍時に前記レンズ以外のレンズで発生する軸上色収差の変動や倍率色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することが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（５）の下限値を０．６２０とすることがより好ましい。また、本願の効果をより確実にするために、条件式（５）の上限値を１．２９０とすることがより好ましい。 In the case where the lens has negative refractive power, if the value of the conditional expression (5) of the variable magnification optical system of the present application falls below the lower limit value, it is possible to suppress fluctuation of astigmatism generated in the lens at the time of zooming. It becomes difficult and can not realize high optical performance. On the other hand, when the corresponding value of the conditional expression (5) of the variable magnification optical system of the present application exceeds the upper limit value, it is difficult to suppress fluctuations of axial chromatic aberration and magnification chromatic aberration caused by lenses other than the lens during zooming. As a result, high optical performance can not be realized.
In order to make the effect of the present invention more reliable, it is more preferable to set the lower limit value of the conditional expression (5) to 0.620. Moreover, in order to make the effect of this application more reliable, it is more preferable to set the upper limit of conditional expression (5) to 1.290.

また本願の変倍光学系は、前記第５レンズ群が前記レンズを少なくとも１つ有することが望ましい。この構成により、第５レンズ群で発生する球面収差、非点収差、軸上色収差、及び倍率色収差を広角端状態から望遠端状態にわたって抑えることができる。 In the variable magnification optical system according to the present application, it is preferable that the fifth lens group includes at least one lens. According to this configuration, it is possible to suppress spherical aberration, astigmatism, axial chromatic aberration, and lateral chromatic aberration generated in the fifth lens group from the wide-angle end state to the telephoto end state.

また本願の変倍光学系は、前記第４レンズ群が前記レンズを少なくとも１つ有することが望ましい。この構成により、変倍時に第４レンズ群で発生するコマ収差、非点収差、軸上色収差、及び倍率色収差のそれぞれの変動を広角端状態から望遠端状態にわたって抑えることができる。 Further, in the variable magnification optical system of the present application, it is desirable that the fourth lens group has at least one lens. With this configuration, it is possible to suppress the fluctuations of coma, astigmatism, axial chromatic aberration, and lateral chromatic aberration that occur in the fourth lens unit during zooming from the wide-angle end state to the telephoto end state.

また本願の変倍光学系は、前記第３レンズ群が前記レンズを少なくとも１つ有することが望ましい。この構成により、変倍時に第３レンズ群で発生する球面収差、非点収差、軸上色収差、及び倍率色収差のそれぞれの変動を広角端状態から望遠端状態にわたって抑えることができる。 Further, in the variable magnification optical system of the present application, it is desirable that the third lens group have at least one lens. With this configuration, it is possible to suppress the respective variations of the spherical aberration, the astigmatism, the axial chromatic aberration, and the lateral chromatic aberration which occur in the third lens unit at the time of zooming, from the wide-angle end state to the telephoto end state.

また本願の変倍光学系は、前記第１レンズ群が負の屈折力を有する前記レンズを少なくとも１つ有することが望ましい。この構成により、変倍時に第１レンズ群で発生する非点収差の変動や球面収差の変動、倍率色収差の変動、特に２次色収差の変動を抑えることができ、高い光学性能を実現することができる。 In the zoom lens system according to the present application, it is preferable that the first lens group includes at least one lens having negative refractive power. With this configuration, it is possible to suppress the variation of astigmatism, the variation of spherical aberration, the variation of lateral chromatic aberration, particularly the variation of secondary chromatic aberration which occurs in the first lens group at the time of zooming, and realize high optical performance. it can.

また本願の変倍光学系は、前記第５レンズ群が負の屈折力を有する前記レンズを少なくとも１つ有することが望ましい。この構成により、変倍時に第５レンズ群で発生する非点収差の変動や球面収差の変動、軸上色収差の変動を抑えることができ、高い光学性能を実現することができる。 In the zoom lens system according to the present application, it is preferable that the fifth lens group includes at least one lens having negative refractive power. With this configuration, it is possible to suppress the fluctuation of astigmatism, the fluctuation of spherical aberration, and the fluctuation of axial chromatic aberration that occur in the fifth lens group at the time of zooming, and to realize high optical performance.

また本願の変倍光学系は、前記第５レンズ群が以下の条件式（６）を満足する前記レンズを少なくとも１つ有することが望ましい。
（６）３１．６０＜ νｄｈ５
但し、
νｄｈ５：前記第５レンズ群中の前記レンズのｄ線（波長５８７．６ｎｍ）に対するアッベ数 In the zoom lens system according to the present application, it is preferable that the fifth lens group include at least one lens satisfying the following conditional expression (6).
(6) 31.60 <dhdh5
However,
dhdh5: Abbe number for d-line (wavelength 587.6 nm) of the lens in the fifth lens group

条件式（６）は、第５レンズ群中の前記レンズの最適なアッベ数を規定するものである。本願の変倍光学系は、条件式（６）を満足することにより、軸上色収差や倍率色収差を抑えることができる。
本願の変倍光学系の条件式（６）の対応値が下限値を下回ると、第５レンズ群において、前記レンズ以外のレンズで発生する軸上色収差や倍率色収差を抑えることが困難になり、高い光学性能を実現することができなくなってしまう。 Conditional expression (6) defines the optimum Abbe number of the lens in the fifth lens group. The variable magnification optical system according to the present application can suppress axial chromatic aberration and lateral chromatic aberration by satisfying the conditional expression (6).
When the corresponding value of the conditional expression (6) of the variable magnification optical system of the present application falls below the lower limit, it becomes difficult to suppress axial chromatic aberration and lateral chromatic aberration generated in lenses other than the lens in the fifth lens group. It will not be possible to realize high optical performance.

また本願の変倍光学系は、前記第４レンズ群が負の屈折力を有する前記レンズを少なくとも１つ有することが望ましい。この構成により、第４レンズ群で発生する軸上色収差や倍率色収差、特に２次色収差を抑えることができ、高い光学性能を実現することができる。 In the zoom lens system according to the present application, it is preferable that the fourth lens group includes at least one lens having negative refractive power. With this configuration, it is possible to suppress axial chromatic aberration and lateral chromatic aberration, particularly secondary chromatic aberration, generated in the fourth lens group, and high optical performance can be realized.

また本願の変倍光学系は、前記第３レンズ群が負の屈折力を有する前記レンズを少なくとも１つ有することが望ましい。この構成により、第３レンズ群で発生する軸上色収差、特に２次色収差を抑えることができ、高い光学性能を実現することができる。 In the zoom lens system according to the present application, it is preferable that the third lens group includes at least one lens having negative refractive power. With this configuration, it is possible to suppress axial chromatic aberration, particularly secondary chromatic aberration, generated in the third lens group, and high optical performance can be realized.

また本願の変倍光学系は、前記第１レンズ群が以下の条件式（７）を満足する正レンズを有することが望ましい。
（７）７５．００＜ νｄｐ１
但し、
νｄｐ１：前記第１レンズ群中の前記正レンズのｄ線（波長５８７．６ｎｍ）に対するアッベ数 In the zoom lens system of the present application, it is preferable that the first lens group have a positive lens that satisfies the following conditional expression (7).
(7) 75.00 <dpdp1
However,
dpdp1: Abbe number for d-line (wavelength 587.6 nm) of the positive lens in the first lens group

条件式（７）は、第１レンズ群中の前記正レンズの最適なアッベ数を規定するものである。本願の変倍光学系は、条件式（７）を満足することにより、変倍時に軸上色収差の変動や倍率色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（７）の対応値が下限値を下回ると、変倍時に軸上色収差の変動や倍率色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することが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（７）の上限値を９９．００とすることがより好ましい。本願の変倍光学系の条件式（７）の対応値が９９．００より小さくなることにより、変倍時に前記正レンズ以外のレンズで発生する軸上色収差の変動や倍率色収差の変動を抑えることができ、高い光学性能を実現することができる。 Conditional expression (7) defines the optimum Abbe number of the positive lens in the first lens group. By satisfying the conditional expression (7), the variable magnification optical system according to the present application can suppress fluctuation of axial chromatic aberration and fluctuation of lateral chromatic aberration at the time of magnification change.
When the corresponding value of the conditional expression (7) of the variable magnification optical system of the present application falls below the lower limit value, it becomes difficult to suppress fluctuations of axial chromatic aberration and magnification chromatic aberration during zooming, and realizes high optical performance. Will not be able to
In order to further ensure the effect of the present application, it is more preferable to set the upper limit value of conditional expression (7) to 99.00. Since the corresponding value of the conditional expression (7) of the variable magnification optical system according to the present application is smaller than 99.00, the fluctuation of axial chromatic aberration and the fluctuation of lateral chromatic aberration caused by lenses other than the positive lens during zooming are suppressed. And high optical performance can be realized.

また本願の変倍光学系は、前記第４レンズ群が以下の条件式（８）を満足する正レンズを有することが望ましい。
（８）７５．００＜ νｄｐ４
但し、
νｄｐ４：前記第４レンズ群中の前記正レンズのｄ線（波長５８７．６ｎｍ）に対するアッベ数 In the zoom lens system according to the present application, it is preferable that the fourth lens group have a positive lens which satisfies the following conditional expression (8).
(8) 75.00 <dpdp4
However,
dpdp4: Abbe number for d-line (wavelength 587.6 nm) of the positive lens in the fourth lens group

条件式（８）は、第４レンズ群中の前記正レンズの最適なアッベ数を規定するものである。本願の変倍光学系は、条件式（８）を満足することにより、変倍時に軸上色収差の変動や倍率色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（８）の対応値が下限値を下回ると、変倍時に軸上色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することが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（８）の上限値を９９．００とすることがより好ましい。本願の変倍光学系の条件式（８）の対応値が９９．００より小さくなることにより、前記正レンズ以外のレンズで発生する軸上色収差を抑えることができ、高い光学性能を実現することができる。 Conditional expression (8) defines the optimum Abbe number of the positive lens in the fourth lens group. By satisfying the conditional expression (8), the variable magnification optical system according to the present application can suppress fluctuation of axial chromatic aberration and fluctuation of lateral chromatic aberration at the time of zooming.
When the corresponding value of the conditional expression (8) of the variable magnification optical system of the present application falls below the lower limit value, it becomes difficult to suppress fluctuation of axial chromatic aberration during zooming, and high optical performance can not be realized. .
In order to make the effect of the present invention more reliable, it is more preferable to set the upper limit of conditional expression (8) to 99.00. By making the correspondence value of the conditional expression (8) of the variable magnification optical system of the present application smaller than 99.00, it is possible to suppress axial chromatic aberration generated by lenses other than the positive lens and realize high optical performance. Can.

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１レンズ群の焦点距離と第２レンズ群の焦点距離を適切なものにすることができる。そして、各レンズ群で発生する球面収差や非点収差を抑え、変倍時に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。 Further, in the variable magnification optical system of the present application, it is desirable that an interval between the first lens group and the second lens group be increased at the time of zooming from the wide angle end state to the telephoto end state. By this configuration, the focal length of the first lens group and the focal length of the second lens group can be made appropriate. Further, it is possible to suppress spherical aberration and astigmatism generated in each lens unit, and to suppress variation of spherical aberration and variation of astigmatism during zooming.

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２レンズ群の焦点距離と第３レンズ群の焦点距離を適切なものにすることができる。そして、各レンズ群で発生する球面収差や非点収差を抑え、変倍時に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。 Further, in the variable magnification optical system of the present application, it is desirable that the distance between the second lens group and the third lens group be reduced at the time of zooming from the wide-angle end state to the telephoto end state. By this configuration, the focal length of the second lens group and the focal length of the third lens group can be made appropriate. Further, it is possible to suppress spherical aberration and astigmatism generated in each lens unit, and to suppress variation of spherical aberration and variation of astigmatism during zooming.

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３レンズ群と前記第４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、変倍時に第３レンズ群及び第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できる。 Further, in the variable magnification optical system of the present application, it is desirable that the distance between the third lens group and the fourth lens group be increased at the time of zooming from the wide angle end state to the telephoto end state. With this configuration, it is possible to suppress the fluctuation of the spherical aberration and the fluctuation of the astigmatism generated in the third lens unit and the fourth lens unit at the time of zooming.

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、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 apparatus of the present application is characterized by including the variable magnification optical system having the above-described configuration. As a result, it is possible to realize an optical device that is compact and has high optical performance.

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、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とを有する変倍光学系の製造方法であって、以下の条件式（１）を満足するレンズを少なくとも１つ有するようにし、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、前記第２レンズ群と前記第３レンズ群との間隔、前記第３レンズ群と前記第４レンズ群との間隔、及び前記第４レンズ群と前記第５レンズ群との間隔が変化するようにすることを特徴としている。これにより、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。
（１）１．９２８＜ｎｄｈ
但し、
ｎｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対する屈折率 In the method of manufacturing a variable magnification optical system according to the present application, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power are arranged in order from the object side A variable magnification optical system having a fourth lens group having a negative refractive power and a fifth lens group having a positive refractive power, the lens satisfying the following conditional expression (1): The distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, at the time of zooming from the wide-angle end state to the telephoto end state. 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 may be changed. As a result, it is possible to manufacture a compact variable power optical system having high optical performance.
(1) 1.928 <ndh
However,
ndh: refractive index to the d-line (wavelength 587.6 nm) of the lens

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。
（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、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５とから構成されている。 Hereinafter, a variable magnification optical system according to a numerical example of the present application will be described based on the attached drawings.
(First embodiment)
1 (a), 1 (b), and 1 (c) are cross-sectional views in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively, of the variable magnification optical system according to the first embodiment of the present application. It is.
The variable magnification optical system according to the present embodiment 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 group having a positive refractive power. It is composed of a lens group G3, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

第１レンズ群Ｇ１は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ１１と両凸形状の正レンズＬ１２との接合レンズと、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。
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。なお、第３レンズ群Ｇ３の物体側には、開口絞りＳが備えられている。 The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 with a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 with 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 facing the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface facing the object It consists of a negative meniscus lens L24. The negative meniscus lens L21 is a glass mold aspheric lens in which the lens surface on the object side is aspheric.
The third lens group G3 is composed of, in order from the object side, a cemented lens of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32. An aperture stop S is provided on the object side of the third lens group G3.

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、両凹形状の負レンズＬ４３と物体側に凸面を向けた正メニスカスレンズＬ４４との接合レンズとからなる。なお、負レンズＬ４３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。
第５レンズ群Ｇ５は、物体側から順に、両凸形状の正レンズＬ５１と、両凸形状の正レンズＬ５２と物体側に凹面を向けた負メニスカスレンズＬ５３との接合レンズと、物体側に凸面を向けた負メニスカスレンズＬ５４と両凸形状の正レンズＬ５５との接合レンズと、像側に凸面を向けた負メニスカスレンズＬ５６とからなる。なお、負メニスカスレンズＬ５６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。
なお、本実施例に係る変倍光学系では、第５レンズ群Ｇ５と像面Ｉとの間に、ローパスフィルタやセンサ用カバーガラス等を配置してもよい。 The fourth lens group G4, in order from the object side, is a cemented lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a positive meniscus with a biconcave negative lens L43 and a convex surface directed to the object side And a cemented lens with the lens L44. The negative lens L43 is a glass mold aspheric lens in which the lens surface on the object side is aspheric.
The fifth lens group G5 includes, in order from the object side, a double convex positive lens L51, a double convex positive lens L52, and a cemented lens of a negative meniscus lens L53 having a concave surface facing the object side, and a convex surface facing the object side And a positive meniscus lens L55 having a biconvex shape, and a negative meniscus lens L56 having a convex face directed to the image side. The negative meniscus lens L56 is a glass mold aspheric lens having an aspheric lens surface on the image side.
In the variable magnification optical system according to the present embodiment, a low pass filter, a cover glass for sensor, or the like may be disposed between the fifth lens group G5 and the image plane I.

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との空気間隔が減少し、開口絞りＳと第３レンズ群Ｇ３との空気間隔が減少するように、第１〜第５レンズ群Ｇ１〜Ｇ５が光軸に沿って移動し、開口絞りＳは第４レンズ群Ｇ４と一体的に移動する。詳細には、第１レンズ群Ｇ１と第３レンズ群Ｇ３は変倍時に物体側へ移動する。第２レンズ群Ｇ２、第４レンズ群Ｇ４、及び第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像側へ移動する。 Under the above configuration, in the variable magnification optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 is increased at the time of zooming from the wide angle end state to the telephoto end state. The air gap between the second lens group G2 and the third lens group G3 decreases, and the air gap between the third lens group G3 and the fourth lens group G4 increases, and the fourth lens group G4 and the fifth lens group G5 The first to fifth lens groups G1 to G5 move along the optical axis so that the air gap decreases and the air gap between the aperture stop S and the third lens group G3 decreases, and the aperture stop S It moves integrally with the lens unit G4. Specifically, the first lens group G1 and the third lens group G3 move to the object side during zooming. The second lens group G2, the fourth lens group G4, and the fifth lens group G5 move to the object side from the wide angle end state to the intermediate focal length state, and move to the image side from the intermediate focal length state to the telephoto end state.

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 presents values of specifications of the variable magnification optical system according to the present example.
In Table 1, f is the focal length, and BF is the back focus (the distance between the most image side lens surface and the image plane I on the optical axis).
In [Surface Data], the surface number is the order of the optical surface counted from the object side, r is the radius of curvature, d is the surface distance (the distance between the nth surface (n is an integer) and the n + 1th surface), nd is The refractive index for the d-line (wavelength 587.6 nm) and ν d indicate the Abbe number for the d-line (wavelength 587.6 nm). The object plane indicates the object plane, the variable plane spacing is variable, 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. In the aspheric surface, the surface number is marked with *, and the value of the paraxial radius of curvature is shown in the column of radius of curvature r. The description of the refractive index nd = 1.000000 of air 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^２／ｒ）／［１＋｛１−κ（ｈ／ｒ）^２｝^１／２］
＋A4ｈ^４＋A6ｈ^６＋A8ｈ^８＋A10ｈ^１０
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。 [Spherical surface data] shows the aspheric surface coefficient and the conical constant when the shape of the aspheric surface shown in [Surface data] is expressed by the following equation.
x = (h ² / r) / [1+ {1-κ (h / r) ² } ^1/2 ]
+ A4h ⁴ + A6h ⁶ + A8h ⁸ + A10h ¹⁰
Here, h is the height in the direction perpendicular to the optical axis, x is the distance along the optical axis direction from the tangent plane of the apex of the aspheric surface at height h to the aspheric surface (sag amount), and κ is the conical constant , A4, A6, A8 and A10 are aspheric coefficients, and r is the radius of curvature (paraxial radius of curvature) of the reference spherical surface. Incidentally, "E-n" (n is an integer) indicates "× 10 ^-n", for example "1.234E-05" denotes "1.234 × 10 ^-5". The second-order aspheric coefficient A2 is 0, and the description is omitted.

［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、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。
［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 F number, ω is half angle of view (unit: “°”), Y is image height, TL is total length of variable magnification optical system (image from first surface at infinity object focusing The distance on the optical axis to the surface I), dn represents a variable distance between the nth surface and the n + 1th surface, and φ represents the diameter of the aperture stop S. W indicates the wide-angle end state, M indicates the intermediate focal length state, and T indicates the telephoto end state.
[Lens group data] indicates the starting surface of each lens group and the focal length.
In [Conditional Expression Correspondence Value], the correspondence values of the conditional expressions of the variable magnification optical system according to the present embodiment are shown.

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 unit of focal length f, radius of curvature r and other lengths listed in Table 1 is generally “mm”. However, the optical system is not limited to this because the same optical performance can be obtained by proportional enlargement or reduction.
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ｒｄｎｄ νｄ
物面 ∞

1 104.5118 1.6000 2.003300 28.27
2 39.3751 7.4000 1.497820 82.57
3 -463.5701 0.1000
4 40.3116 5.4000 1.834810 42.73
5 241.9089 可変

＊6 79.9711 1.0000 1.851350 40.10
7 8.1252 4.8500
8 -14.2116 1.0000 1.883000 40.66
9 124.9279 0.1000
10 30.8124 3.3500 1.808090 22.74
11 -15.1873 0.3000
12 -13.2222 1.0000 1.883000 40.66
13 -23.0302 可変

14(絞りS) ∞ 可変

15 26.1923 1.0000 1.954000 33.46
16 12.2483 2.8500 1.719990 50.27
17 -43.5073 可変

18 14.5527 2.8500 1.497820 82.57
19 -40.3302 1.0000 1.950000 29.37
20 173.4596 2.1500
＊21 -105.0156 1.0000 1.806100 40.71
22 10.9037 2.2000 1.808090 22.74
23 28.6084 可変

24 30.6882 2.8500 1.579570 53.74
25 -18.3905 0.1000
26 18.8919 3.6000 1.518230 58.82
27 -13.1344 1.0000 2.000690 25.46
28 -2198.5412 0.7500
29 412.2295 1.0000 1.954000 33.46
30 12.8823 3.5000 1.755200 27.57
31 -23.7185 1.1500
32 -16.1296 1.0000 1.806100 40.71
＊33 -97.3104 ＢＦ

像面 ∞

［非球面データ］
第６面
κ -8.7294
A4 4.64796E-05
A6 -4.09659E-07
A8 2.44519E-09
A10 -9.90503E-12

第２１面
κ -1.5760
A4 1.72590E-05
A6 9.45415E-08
A8 -1.00397E-09
A10 0.00000E+00

第３３面
κ -19.8082
A4 -1.67719E-05
A6 -2.11776E-07
A8 -4.15932E-10
A10 -1.15008E-11

［各種データ］
変倍比 9.42

ＷＴ
ｆ 10.30 〜 97.00
ＦＮＯ 4.09 〜 5.81
ω 40.21 〜 4.76°
Ｙ 8.19 〜 8.19

ＷＭＴ
ｆ 10.30000 50.00013 97.00039
ω 40.21337 9.15519 4.75685
ＦＮＯ 4.09 5.78 5.81
φ 7.68 8.50 9.20
ＴＬ 100.29944 130.25093 139.59967
d5 2.10000 28.50000 39.66696
d13 17.38897 3.31447 2.00000
d14 4.87082 3.98262 1.60000
d17 2.59389 3.48209 5.86471
d23 5.29632 3.42829 3.30000
ＢＦ 13.94944 33.44346 33.06800

［レンズ群データ］
群始面ｆ
1 1 64.38705
2 6 -9.57903
3 15 29.91408
4 18 -81.48313
5 24 28.77173

［条件式対応値］
（１）ｎｄｈ＝ 1.954(L31)、1.950(L42)、1.954(L54)
（２）ｆ１／（−ｆ２）＝ 6.72
（３）（−ｆ２）／ｆ３＝ 0.320
（４） νｄｈ＝ 33.46(L31)、29.37(L42)、33.46(L54)
（６） νｄｈ５＝ 33.46(L54)
（７） νｄｐ１＝ 82.57(L12)
（８） νｄｐ４＝ 82.57(L41)
(Table 1) First embodiment
[Plane data]
Face number r d nd d d
Object ∞

1 104.5118 1.6000 2.003300 28.27
2 39.3751 7.4000 1.497820 82.57
3-463.5701 0.1000
4 40.3116 5.4000 1.834810 42.73
5 241.9089 Variable

* 6 79.9711 1.0000 1.851350 40.10
7 8.1252 4.8500
8 -14.2116 1.0000 1.883000 40.66
9 124.9279 0.1000
10 30.8124 3.3500 1.808090 22.74
11-15.1873 0.3000
12-13.2221 1.0000 1.883000 40.66
13-23.0302 Variable

14 (stop S) ∞ variable

15 26.1923 1.0000 1.954000 33.46
16 12.2483 2.8500 1.719990 50.27
17 -43.5073 Variable

18 14.5527 2.8500 1.497820 82.57
19-40.3301 1.0000 1.950000 29.37
20 173.4596 2.1500
* 21 -105.0156 1.0000 1.806100 40.71
22 10.9037 2.2000 1.808090 22.74
23 28.6084 Variable

24 30.6882 2.8500 1.579570 53.74
25-18.3.905 0.1000
26 18.8919 3.6000 1.518230 58.82
27-13.1344 1.0000 2.000690 25.46
28 -2198.5412 0.7500
29 412.2295 1.0000 1.954000 33.46
30 12.8823 3.5000 1.755200 27.57
31-23.7185 1.1500
32-16.1296 1.0000 1.806100 40.71
* 33-97.3104 BF

Image plane ∞

[Aspheric surface data]
Sixth face--8.7294
A4 4.64796E-05
A6-4.09659E-07
A8 2.44519E-09
A10-9.90503E-12

The 21st face--1.5760
A4 1.72590E-05
A6 9.45415E-08
A8-1.00397E-09
A10 0.00000E + 00

The 33rd face -19.8082
A4 -1.67719E-05
A6-2.11776E-07
A8-4.15932E-10
A10-1.15008E-11

[Various data]
Magnification ratio 9.42

W T
f 10.30 to 97.00
FNO 4.09 to 5.81
ω 40.21 to 4.76 °
Y 8.19 to 8.19

W M T
f 10.30000 50.00013 97.00039
ω 40.21337 9.15519 4.75685
FNO 4.09 5.78 5.81
φ 7.68 8.50 9.20
TL 100. 29944 130.25093 139.59967
d5 2.10000 28.50000 39.66696
d13 17.38897 3.31447 2.00000
d14 4.87082 3.98262 1.60000
d17 2.59389 3.48209 5.86471
d23 5.29632 3.42829 3.30000
BF 13.94944 33.44346 33.06800

[Lens group data]
Group front f
1 1 64. 38705
2 6-9.57903
3 15 29.91408
4 18 -81.48313
5 24 28.77173

[Conditional expression corresponding value]
(1) ndh = 1.954 (L31), 1.950 (L42), 1.954 (L54)
(2) f1 / (− f2) = 6.72
(3) (-f2) / f3 = 0.320
(4) dh dh = 33.46 (L31), 29.37 (L42), 33.46 (L54)
(6) dhdh5 = 33.46 (L54)
(7) dpdp1 = 82.57 (L12)
(8) dpdp4 = 82.57 (L41)

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。 2 (a), 2 (b) and 2 (c) show infinity of the variable magnification optical system according to the first embodiment of the present invention at the wide-angle end, at the intermediate focal length and at the telephoto end, respectively. FIG. 7 shows various aberrations that occurred when the object was in focus.

各収差図において、ＦＮＯはＦナンバー、Ａは光線入射角即ち半画角（単位は「°」）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 of the aberration diagrams, FNO denotes an F number, and A denotes a light beam incident angle, that is, a half angle of view (unit: "°"). 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 astigmatism diagrams, a solid line indicates a sagittal image plane, and a broken line indicates a meridional image plane. The same reference numerals as in this example are used also in the aberration charts of the examples which will be 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 aberration diagrams, it is understood that in the variable magnification optical system according to the present example, various aberrations are well corrected from the wide-angle end state to the telephoto end state, and have high optical performance.

（第２実施例）
図３（ａ）、図３（ｂ）、及び図３（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、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５とから構成されている。 Second Embodiment
3 (a), 3 (b), and 3 (c) are cross-sectional views in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively, of the variable magnification optical system according to the second embodiment of the present application. It is.
The variable magnification optical system according to the present embodiment 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 group having a positive refractive power. It is composed of a lens group G3, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

第１レンズ群Ｇ１は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ１１と両凸形状の正レンズＬ１２との接合レンズと、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、両凹形状の負レンズ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とからなる。
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。なお、第３レンズ群Ｇ３の物体側には、開口絞りＳが備えられている。 The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 with a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 with a convex surface facing the object side Become.
The second lens group G2 includes, in order from the object side, a biconcave negative lens L21, a biconcave negative lens L22, a biconvex positive lens L23, and a negative meniscus lens L24 having a concave surface facing the object side. It consists of
The third lens group G3 is composed of, in order from the object side, a cemented lens of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32. An aperture stop S is provided on the object side of the third lens group G3.

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、両凹形状の負レンズＬ４３と物体側に凸面を向けた正メニスカスレンズＬ４４との接合レンズとからなる。なお、負レンズＬ４３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。
第５レンズ群Ｇ５は、物体側から順に、両凸形状の正レンズＬ５１と、物体側に凹面を向けた正メニスカスレンズＬ５２と物体側に凹面を向けた負メニスカスレンズＬ５３との接合レンズとからなる。なお、正レンズＬ５１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。
なお、本実施例に係る変倍光学系では、第５レンズ群Ｇ５と像面Ｉとの間に、ローパスフィルタやセンサ用カバーガラス等を配置してもよい。 The fourth lens group G4, in order from the object side, is a cemented lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a positive meniscus with a biconcave negative lens L43 and a convex surface directed to the object side And a cemented lens with the lens L44. The negative lens L43 is a glass mold aspheric lens in which the lens surface on the object side is aspheric.
The fifth lens group G5 is composed of, in order from the object side, a double convex positive lens L51, and a cemented lens of a positive meniscus lens L52 concave on the object side and a negative meniscus lens L53 concave on the object side Become. The positive lens L51 is a glass mold aspheric lens having an aspheric lens surface on the object side.
In the variable magnification optical system according to the present embodiment, a low pass filter, a cover glass for sensor, or the like may be disposed between the fifth lens group G5 and the image plane I.

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との空気間隔が減少し、開口絞りＳと第３レンズ群Ｇ３との空気間隔が減少するように、第１〜第５レンズ群Ｇ１〜Ｇ５が光軸に沿って移動し、開口絞りＳは第４レンズ群Ｇ４と一体的に移動する。詳細には、第１レンズ群Ｇ１、第３レンズ群Ｇ３、第４レンズ群Ｇ４、及び第５レンズ群Ｇ５は変倍時に物体側へ移動する。第２レンズ群Ｇ２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像側へ移動する。
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。 Under the above configuration, in the variable magnification optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 is increased at the time of zooming from the wide angle end state to the telephoto end state. The air gap between the second lens group G2 and the third lens group G3 decreases, and the air gap between the third lens group G3 and the fourth lens group G4 increases, and the fourth lens group G4 and the fifth lens group G5 The first to fifth lens groups G1 to G5 move along the optical axis so that the air gap decreases and the air gap between the aperture stop S and the third lens group G3 decreases, and the aperture stop S It moves integrally with the lens unit G4. Specifically, the first lens group G1, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 move toward the object side during zooming. The second lens group G2 moves to the object side from the wide angle end state to the intermediate focal length state, and moves to the image side from the intermediate focal length state to the telephoto end state.
Table 2 below presents 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ｒｄｎｄ νｄ
物面 ∞

1 251.8446 1.6000 1.950000 29.37
2 36.8495 7.9000 1.497820 82.57
3 -162.8867 0.1000
4 41.6898 5.7500 1.883000 40.66
5 7827.2710 可変

6 -808.8261 1.0000 1.883000 40.66
7 9.5148 3.6000
8 -15.5435 1.0000 1.883000 40.66
9 143.0303 0.1000
10 28.6318 3.0500 1.808090 22.74
11 -13.3111 0.2500
12 -12.1771 1.0000 1.834810 42.73
13 -36.4394 可変

14(絞りS) ∞ 可変

15 27.0772 1.0000 2.000690 25.46
16 15.7705 2.5000 1.744000 44.80
17 -35.2142 可変

18 12.6941 2.9500 1.497820 82.57
19 -24.8876 1.0000 1.846660 23.80
20 775.1758 2.1500
＊21 -227.6550 1.0000 1.806100 40.97
22 8.8217 2.2000 1.846660 23.80
23 19.5840 可変

＊24 15.0000 3.1500 1.583130 59.42
25 -23.9888 0.1000
26 -509.6518 4.2000 1.581440 40.98
27 -7.8594 1.0000 1.954000 33.46
28 -200.0000 ＢＦ

像面 ∞

［非球面データ］
第２１面
κ -20.0000
A4 1.61374E-05
A6 -2.79859E-08
A8 -1.22068E-09
A10 0.00000E+00

第２４面
κ 3.6281
A4 -1.21377E-04
A6 -7.10924E-07
A8 1.36403E-08
A10 -4.10781E-10

［各種データ］
変倍比 9.42

ＷＴ
ｆ 10.30 〜 97.00
ＦＮＯ 4.12 〜 6.48
ω 43.07 〜 4.70°
Ｙ 8.19 〜 8.19

ＷＭＴ
ｆ 10.30000 50.00001 96.99995
ω 43.07103 9.11914 4.70123
ＦＮＯ 4.12 5.81 6.48
φ 6.80 7.90 7.90
ＴＬ 90.80323 122.13334 131.09941
d5 2.28937 28.97477 38.62002
d13 13.12572 3.71901 2.00000
d14 6.29895 3.32684 1.40000
d17 2.43367 5.40578 7.33262
d23 6.60623 3.30000 3.30000
ＢＦ 13.44928 30.80693 31.84677

［レンズ群データ］
群始面ｆ
1 1 59.94630
2 6 -8.99248
3 15 24.34092
4 18 -112.21259
5 24 35.78226

［条件式対応値］
（１）ｎｄｈ＝ 1.950(L11)、1.954(L53)
（２）ｆ１／（−ｆ２）＝ 6.67
（３）（−ｆ２）／ｆ３＝ 0.369
（４） νｄｈ＝ 29.37(L11)、33.46(L53)
（５）｜ｆｈ／ｆ１｜＝ 0.761(L11)
（６） νｄｈ５＝ 33.46(L53)
（７） νｄｐ１＝ 82.57(L12)
（８） νｄｐ４＝ 82.57(L41)
(Table 2) Second embodiment
[Plane data]
Face number r d nd d d
Object ∞

1 251.8446 1.6000 1.950000 29.37
2 36.8495 7.9000 1.497820 82.57
3 -162.8867 0.1000
4 41.6898 5.7500 1.883000 40.66
5 7827.2710 Variable

6-808.8261 1.0000 1.883000 40.66
7 9.5148 3.6000
8-15.5435 1.0000 1.883000 40.66
9 143.0303 0.1000
10 28.6318 3.0500 1.808090 22.74
11-13.3 1 0.2500
12-12.1771 1.0000 1.834810 42.73
13-36.4394 Variable

14 (stop S) ∞ variable

15 27.0772 1.0000 2.000690 25.46
16 15. 7705 2. 5000 1. 744000 44. 80
17-35.2142 Variable

18 12.6941 2.9500 1.497820 82.57
19-24.8876 1.0000 1.846660 23.80
20 775.1758 2.1500
* 21-227.6550 1.0000 1.806100 40.97
22 8.8217 2.2000 1.846660 23.80
23 19.5840 Variable

* 24 15.0000 3.1500 1.583130 59.42
25-23.9888 0.1000
26-509.6518 4.2000 1.581440 40.98
27 -7.8594 1.0000 1.954000 33.46
28 -200.0000 BF

Image plane ∞

[Aspheric surface data]
The 21st face -20.0000
A4 1.61374E-05
A6-2.79 859 E-08
A8-1.22068E-09
A10 0.00000E + 00

The 24th 3.6 3.6281
A4-1.212377 E-04
A6-7. 10924 E-07
A8 1.36403E-08
A10-4.10781E-10

[Various data]
Magnification ratio 9.42

W T
f 10.30 to 97.00
FNO 4.12 to 6.48
ω 43.07-4.70 °
Y 8.19 to 8.19

W M T
f 10.30000 50.00001 96.99995
ω 43.07103 9.11914 4.70123
FNO 4.12 5.81 6.48
φ 6.80 7.90 7.90
TL 90.80323 122.13334 131.09941
d5 2.28937 28.97477 38.62002
d13 13.12572 3.71901 2.00000
d14 6.29895 3.32684 1.40000
d17 2.43367 5.40578 7.33262
d23 6.60623 3.30000 3.30000
BF 13.44928 30.80693 31.84677

[Lens group data]
Group front f
1 1 59.94630
2 6 -8.99248
3 15 24.34092
4 18 -112.21259
5 24 35.78226

[Conditional expression corresponding value]
(1) ndh = 1.950 (L11), 1.954 (L53)
(2) f1 / (-f2) = 6.67
(3) (-f2) / f3 = 0.369
(4) dhdh = 29.37 (L11), 33.46 (L53)
(5) | fh / f1 | = 0.761 (L11)
(6) dhdh5 = 33.46 (L53)
(7) dpdp1 = 82.57 (L12)
(8) dpdp4 = 82.57 (L41)

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無限遠物体合焦時の諸収差図である。 FIGS. 4 (a), 4 (b) and 4 (c) show infinity of the variable magnification optical system according to the second embodiment of the present invention at the wide-angle end, at the intermediate focal length and at the telephoto end, respectively. FIG. 7 shows various aberrations that occurred when the object was in focus.

（第３実施例）
図５（ａ）、図５（ｂ）、及び図５（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、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５とから構成されている。 Third Embodiment
5 (a), 5 (b), and 5 (c) are cross-sectional views in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively, of the variable magnification optical system according to the third embodiment of the present application. It is.
The variable magnification optical system according to the present embodiment 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 group having a positive refractive power. It is composed of a lens group G3, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

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と像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、両凹形状の負レンズＬ４３と物体側に凸面を向けた正メニスカスレンズＬ４４との接合レンズとからなる。なお、負レンズＬ４３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。
第５レンズ群Ｇ５は、物体側から順に、両凸形状の正レンズＬ５１と、両凸形状の正レンズＬ５２と物体側に凹面を向けた負メニスカスレンズＬ５３との接合レンズとからなる。なお、正レンズＬ５１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。
なお、本実施例に係る変倍光学系では、第５レンズ群Ｇ５と像面Ｉとの間に、ローパスフィルタやセンサ用カバーガラス等を配置してもよい。 The fourth lens group G4 includes, in order from the object side, a cemented lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a convex surface facing the image side, a biconcave negative lens L43, and a convex surface on the object side And a cemented lens with a positive meniscus lens L44 directed. The negative lens L43 is a glass mold aspheric lens in which the lens surface on the object side is aspheric.
The fifth lens group G5 is composed of, in order from the object side, a double convex positive lens L51, and a cemented lens of a double convex positive lens L52 and a negative meniscus lens L53 having a concave surface facing the object side. The positive lens L51 is a glass mold aspheric lens having an aspheric lens surface on the object side.
In the variable magnification optical system according to the present embodiment, a low pass filter, a cover glass for sensor, or the like may be disposed between the fifth lens group G5 and the image plane I.

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との空気間隔が減少し、開口絞りＳと第３レンズ群Ｇ３との空気間隔が減少するように、第１〜第５レンズ群Ｇ１〜Ｇ５が光軸に沿って移動し、開口絞りＳは第４レンズ群Ｇ４と一体的に移動する。詳細には、第１レンズ群Ｇ１、第３レンズ群Ｇ３、第４レンズ群Ｇ４、及び第５レンズ群Ｇ５は変倍時に物体側へ移動する。第２レンズ群Ｇ２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像側へ移動する。
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。 Under the above configuration, in the variable magnification optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 is increased at the time of zooming from the wide angle end state to the telephoto end state. The air gap between the second lens group G2 and the third lens group G3 decreases, and the air gap between the third lens group G3 and the fourth lens group G4 increases, and the fourth lens group G4 and the fifth lens group G5 The first to fifth lens groups G1 to G5 move along the optical axis so that the air gap decreases and the air gap between the aperture stop S and the third lens group G3 decreases, and the aperture stop S It moves integrally with the lens unit G4. Specifically, the first lens group G1, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 move toward the object side during zooming. The second lens group G2 moves to the object side from the wide angle end state to the intermediate focal length state, and moves to the image side from the intermediate focal length state to the telephoto end state.
Table 3 below presents 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ｒｄｎｄ νｄ
物面 ∞

1 149.8692 1.6000 1.949665 27.56
2 44.3736 6.8398 1.497820 82.51
3 -243.5058 0.1000
4 45.3756 5.3508 1.867900 41.78
5 311.4136 可変

＊6 89.0243 1.2000 1.834810 42.73
7 8.4900 3.7581
8 -15.7255 1.0000 1.834810 42.73
9 250.0000 0.1000
10 25.2749 3.2925 1.808090 22.74
11 -17.4750 0.5480
12 -12.6196 1.0000 1.816000 46.59
13 -33.4252 可変

14(絞りS) ∞ 可変

15 29.1681 1.0000 1.889044 39.77
16 18.2404 3.2071 1.593125 66.16
17 -26.5261 可変

18 14.2857 3.5654 1.497820 82.51
19 -21.9776 1.0000 1.902000 25.23
20 -82.8398 2.2052
＊21 -52.3071 1.0000 1.848976 43.01
22 9.1414 2.6915 1.950000 29.37
23 25.8642 可変

＊24 35.4414 3.3350 1.589130 61.22
25 -21.3191 0.3000
26 42.3100 4.4029 1.581440 40.98
27 -10.1979 1.2000 1.954000 33.46
28 -300.4717 ＢＦ

像面 ∞

［非球面データ］
第６面
κ 1.0000
A4 3.45801E-05
A6 -1.38520E-07
A8 -5.59965E-11
A10 1.26030E-11

第２１面
κ 1.0000
A4 1.74477E-06
A6 1.28096E-07
A8 -2.63692E-09
A10 0.00000E+00

第２４面
κ 1.0000
A4 -1.22983E-05
A6 1.47314E-07
A8 -5.48742E-10
A10 0.00000E+00

［各種データ］
変倍比 9.42

ＷＴ
ｆ 10.30 〜 97.00
ＦＮＯ 3.50 〜 5.62
ω 39.90 〜 4.69°
Ｙ 8.19 〜 8.19

ＷＭＴ
ｆ 10.30001 49.99971 96.99932
ω 39.90076 9.01930 4.68610
ＦＮＯ 3.50 5.20 5.62
φ 8.99 8.81 9.00
ＴＬ 99.25773 129.21001 139.67596
d5 1.99991 30.68218 41.26022
d13 18.53440 4.14191 2.00000
d14 3.76478 2.96318 1.40000
d17 3.54181 4.34341 5.90655
d23 8.01786 3.30678 3.30001
ＢＦ 14.70262 35.07621 37.11281

［レンズ群データ］
群始面ｆ
1 1 66.85483
2 6 -9.36043
3 15 27.88295
4 18 -160.91663
5 24 33.55859

［条件式対応値］
（１）ｎｄｈ＝ 1.950(L44)、1.954(L53)
（２）ｆ１／（−ｆ２）＝ 7.14
（３）（−ｆ２）／ｆ３＝ 0.336
（４） νｄｈ＝ 29.37(L44)、33.46(L53)
（６） νｄｈ５＝ 33.46(L53)
（７） νｄｐ１＝ 82.51(L12)
（８） νｄｐ４＝ 82.51(L41)
(Table 3) Third embodiment
[Plane data]
Face number r d nd d d
Object ∞

1 149.8692 1.6000 1.949665 27.56
2 44.3736 6.8398 1 .97820 82.51
3 -243.5058 0.1000
4 45.3756 5.3508 1.867900 41.78
5 311.4136 Variable

* 6 89.0243 1.2000 1.834810 42.73
7 8.4900 3.7581
8-15.7255 1.0000 1.834810 42.73
9 250.0000 0.1000
10 25.2749 3.2925 1.808090 22.74
11-17.4 750 0.5480
12-12.6196 1.0000 1.816000 46.59
13 -33.4252 Variable

14 (stop S) ∞ variable

15 29.1681 1.0000 1.889044 39.77
16 18.2404 3.2071 1.593125 66.16
17-26.5261 Variable

18 14.2857 3.5654 1.497820 82.51
19-21.9776 1.0000 1.902000 25.23
20 -82.8398 2.2052
* 21-52.3071 1.0000 1.848976 43.01
22 9.1414 2.6915 1.950000 29.37
23 25.8642 Variable

* 24 35.4414 3.3350 1.589130 61.22
25-21.3191 0.3000
26 42.3100 4.4029 1.581440 40.98
27 -10.1979 1.2000 1.954000 33.46
28 -300.4717 BF

Image plane ∞

[Aspheric surface data]
Sixth face 1. 1.0000
A4 3.45801E-05
A6-1.38520E-07
A8-5.59965E-11
A10 1.26030E-11

The 21st face 1. 1.0000
A4 1.74477E-06
A6 1.28096E-07
A8 -2.63692E-09
A10 0.00000E + 00

The 24th face 1. 1.0000
A4 -1.22983E-05
A6 1.47314E-07
A8 -5.48742E-10
A10 0.00000E + 00

[Various data]
Magnification ratio 9.42

W T
f 10.30 to 97.00
FNO 3.50 to 5.62
ω 39.90 to 4.69 °
Y 8.19 to 8.19

W M T
f 10.3 0001 49.99 971 96.99 932
ω 39.90076 9.01930 4.68610
FNO 3.50 5.20 5.62
φ 8.99 8.81 9.00
TL 99.25773 129.201001 139.67596
d5 1.99991 30.68218 41.26022
d13 18.53440 4.14191 2.00000
d14 3.76478 2.96318 1.40000
d17 3.54181 4.34341 5.9065
d23 8.01786 3.30678 3.30001
BF 14.70262 35.07621 37.11281

[Lens group data]
Group front f
1 1 66.85483
2 6-9.36043
3 15 27.88295
4 18-160.91663
5 24 33.55859

[Conditional expression corresponding value]
(1) ndh = 1.950 (L44), 1.954 (L53)
(2) f1 / (-f2) = 7.14
(3) (-f2) / f3 = 0.336
(4) dh dh = 29. 37 (L 44), 33. 46 (L 53)
(6) dhdh5 = 33.46 (L53)
(7) dpdp1 = 82.51 (L12)
(8) dpdp4 = 82.51 (L41)

図６（ａ）、図６（ｂ）、及び図６（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。 6 (a), 6 (b), and 6 (c) show infinity of the variable magnification optical system according to the third embodiment of the present invention at the wide-angle end, at the intermediate focal length, and at the telephoto end, respectively. FIG. 7 shows various aberrations that occurred when the object was in focus.

上記各実施例によれば、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, it is possible to realize a compact variable power optical system having high optical performance. The above-described embodiments show one specific example of the present invention, and the present invention is not limited thereto. The following contents can be suitably adopted within the range that does not impair the optical performance of the variable magnification optical system of the present application.

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。 Although a five-group configuration is shown as a numerical example of the variable-magnification optical system according to the present application, the present application is not limited to this, and forms a variable-magnification optical system of other group configurations (for example, six groups, seven groups, etc.) It can also be done. Specifically, a lens or lens group may be added to the most object side or most image side of the variable magnification optical system of the present application. The lens group indicates a portion having at least one lens separated by an air gap that changes at the time of 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。特に、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合焦レンズ群とすることが好ましい。また、斯かる合焦レンズ群は、オートフォーカスに適用することも可能であり、オートフォーカス用のモータ、例えば超音波モータ等による駆動にも適している。 Further, in the variable magnification optical system according to the present invention, in order to focus from an infinite distance object to a close distance object, a part of the lens group, an entire lens group, or a plurality of lens groups is used as a focusing lens group. It may be configured to move in the axial direction. In particular, it is preferable to set at least a part of the second lens group, at least a part of the third lens group, or at least a part of the fourth lens group, or at least a part of the fifth lens group as a focusing lens group. Further, such a focusing lens group can also be applied to auto focusing, and is also suitable for driving by a motor for auto focusing 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 according to the present application, all or part of any lens group is moved as a vibration reduction lens group so as to include a component in a direction perpendicular to the optical axis, or a surface including the optical axis It is also possible to correct image blurring caused by camera shake or the like by rotating (swinging) inward. In particular, in the variable magnification optical system of the present application, it is preferable that at least a part of the third lens group or at least a part of the fourth lens group or at least a part of the fifth lens group be a vibration reduction lens group.

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。 Further, the lens surface of the lens constituting the variable magnification optical system of the present invention may be a spherical surface or a plane, or may be an aspheric surface. When the lens surface is spherical or flat, it is preferable because lens processing and assembly adjustment can be facilitated, and deterioration of optical performance due to lens processing and assembly adjustment errors can be prevented. In addition, even when the image plane shifts, it is preferable because the deterioration of the imaging performance is small. When the lens surface is aspheric, any of aspheric aspheric surfaces by grinding, a glass mold aspheric surface formed by shaping a glass into aspheric surface shape, or a composite aspheric surface formed by forming a resin on a glass surface into an aspheric surface 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レンズ群中又は第３レンズ群の近傍に配置されることが好ましく、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。 Further, in the variable magnification optical system of the present application, the aperture stop is preferably disposed in the third lens group or in the vicinity of the third lens group, and the lens frame substitutes its role without providing a member as the aperture stop. It is also good.
In addition, an anti-reflection film having high transmittance over a wide wavelength range may be provided on the lens surface of the lens constituting the variable magnification optical system of the present application. This can reduce flare and ghost and achieve high contrast and high optical performance.

次に、本願の変倍光学系を備えたカメラを図７に基づいて説明する。
図７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７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 provided with the variable magnification optical system of the present application will be described based on FIG.
FIG. 7 is a diagram showing a configuration of a camera provided with the variable magnification optical system of the present application.
As shown in FIG. 7, the camera 1 is a so-called mirrorless camera of an interchangeable lens type provided with the variable magnification optical system according to the first embodiment as the photographing lens 2.
In the present camera 1, light from an object (not shown) from the object (not shown) is collected by the photographing lens 2 and passes through an OLPF (Optical Low Pass Filter) (not shown) on the imaging surface of the imaging unit 3 Form an image of the subject. Then, the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate the image of the subject. This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1. Thereby, the photographer can observe the subject via the EVF 4.
When the photographer presses a release button (not shown), the image of the subject generated by the imaging unit 3 is stored in a memory (not shown). In this way, the photographer can shoot a subject with the main 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、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、小型化を図りながら、高い光学性能を実現することができる。なお、上記第２、第３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 variable magnification optical system according to the first embodiment mounted on the present camera 1 as the photographing lens 2 is a small sized variable magnification optical system having high optical performance. Therefore, the camera 1 can achieve high optical performance while achieving downsizing. Even if a camera mounted with the variable magnification optical system according to the second and third embodiments as the photographing lens 2 is configured, the same effect as the camera 1 can be obtained. Even when the variable magnification optical system according to each of the above embodiments is mounted on a single-lens reflex camera having a quick return mirror and observing a subject by a finder optical system, the same effect as that of 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８に基づいて説明する。
図８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、負の屈折力を有する第４レンズ群と、正の屈折力を有する第５レンズ群とを有する変倍光学系の製造方法であって、以下のステップＳ１、Ｓ２を含むものである。 Finally, an outline of a method of manufacturing a variable magnification optical system according to the present application will be described based on FIG.
The manufacturing method of the variable magnification optical system of the present application shown in FIG. 8 has a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power in order from the object side. A manufacturing method of a variable power optical system including a third lens group, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power, including the following steps S1 and S2 It is

ステップＳ１：以下の条件式（１）を満足するレンズを変倍光学系が少なくとも１つ有するようにし、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）１．９２８＜ｎｄｈ
但し、
ｎｄｈ：前記レンズのｄ線（波長５８７．６ｎｍ）に対する屈折率 Step S1: A variable magnification optical system has at least one lens satisfying the following conditional expression (1), and the respective lens units are arranged in order from the object side in the lens barrel.
(1) 1.928 <ndh
However,
ndh: refractive index to the d-line (wavelength 587.6 nm) of the lens

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、第２レンズ群と第３レンズ群との間隔、第３レンズ群と第４レンズ群との間隔、及び第４レンズ群と第５レンズ群との間隔が変化するようにする。 Step S2: The distance between the first lens group and the second lens group, the second lens group and the second lens group, and the like at the time of zooming from the wide-angle end state to the telephoto end state by providing a known moving mechanism in the lens barrel. The distance between the third lens unit, the distance between the third lens unit and the fourth lens unit, and the distance between the fourth lens unit and the fifth lens unit are changed.

斯かる本願の変倍光学系の製造方法によれば、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 the manufacturing method of such a variable power optical system of the present application, it is possible to manufacture a compact variable power optical system having high optical performance.

Ｇ１第１レンズ群
Ｇ２第２レンズ群
Ｇ３第３レンズ群
Ｇ４第４レンズ群
Ｇ５第５レンズ群
Ｓ開口絞り
Ｉ像面 G1 first lens group G2 second lens group G3 third lens group G4 fourth lens group G5 fifth lens group S aperture stop I image plane

Claims

From the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a negative refractive power And a fifth lens unit having a positive refractive power, the lens unit substantially including five lens units,
The first lens group consists of three lenses,
During zooming from the wide-angle end state to the telephoto end state, the distance between adjacent lens groups changes,
Have at least one lens that satisfies the following conditional expression,
1.928 <ndh
However,
ndh: the refractive index to the d-line (wavelength 587.6 nm) of the lens which satisfies the following conditional expression:
0.220 <(-f2) / f3 <0.530
6.67 ≦ f1 / (− f2) <15.00
However,
f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group The first lens group has at least one lens having negative refractive power Variable magnification optical system characterized by

From the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a negative refractive power And a fifth lens unit having a positive refractive power, the lens unit substantially including five lens units,
The first lens group consists of three lenses,
During zooming from the wide-angle end state to the telephoto end state, the distance between adjacent lens groups changes,
Have at least one lens that satisfies the following conditional expression,
1.928 <ndh
However,
ndh: Refractive index with respect to d-line (wavelength 587.6 nm) of the above lens. A variable magnification optical system characterized by satisfying the following conditional expression.
0.220 <(-f2) / f3 <0.530
28.60 <dhdh
However,
f2: focal length of the second lens group f3: focal length of the third lens group dh dh: Abbe number with respect to d-line of the lens (wavelength 587.6 nm)

From the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a negative refractive power And a fifth lens unit having a positive refractive power, the lens unit substantially including five lens units,
During zooming from the wide-angle end state to the telephoto end state, the distance between adjacent lens groups changes,
Have at least one lens that satisfies the following conditional expression,
1.928 <ndh
However,
ndh: Refractive index with respect to d-line (wavelength 587.6 nm) of the above lens. A variable magnification optical system characterized by satisfying the following conditional expression.
6.67 ≦ f1 / (− f2) <15.00
28.60 <dhdh
However,
f1: focal length of the first lens group f2: focal length of the second lens group dh dh: Abbe number with respect to d-line of the lens (wavelength 587.6 nm)

From the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a negative refractive power And a fifth lens unit having a positive refractive power, the lens unit substantially including five lens units,
During zooming from the wide-angle end state to the telephoto end state, the distance between adjacent lens groups changes,
Have at least one lens that satisfies the following conditional expression,
1.928 <ndh
However,
ndh: refractive index to d-line (wavelength 587.6 nm) of the lens The first lens group includes at least one lens.
A variable magnification optical system characterized by satisfying the following conditional expression.
28.60 <dhdh
However,
dh dh: Abbe number for d-line (wavelength 587.6 nm) of the lens

From the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a negative refractive power And a fifth lens unit having a positive refractive power, the lens unit substantially including five lens units,
During zooming from the wide-angle end state to the telephoto end state, the distance between adjacent lens groups changes,
Have at least one lens that satisfies the following conditional expression,
1.928 <ndh
However,
ndh: the refractive index to the d-line (wavelength 587.6 nm) of the lens which satisfies the following conditional expression:
28.60 <dhdh
However,
dh dh: Abbe number of the lens with respect to d-line (wavelength 587.6 nm) The variable magnification optical system characterized in that the first lens group has at least one lens satisfying the following conditional expression.
0.450 <| fh / f1 | <1.400
However,
fh: focal length of the lens in the first lens group f1: focal length of the first lens group

The variable magnification optical system according to any one of claims 1, 2, 3, and 5, wherein the first lens group includes at least one lens.

The variable magnification optical system according to any one of claims 1, 2, 4 , and 5 , wherein the following conditional expressions are satisfied.
5.50 <f1 / (− f2) <15.00
However,
f1: focal length of the first lens group f2: focal length of the second lens group

The variable magnification optical system according to any one of claims 3 to 5 , wherein the following conditional expression is satisfied.
0.220 <(-f2) / f3 <0.530
However,
f2: focal length of the second lens group f3: focal length of the third lens group

The variable magnification optical system according to claim 1, wherein the following conditional expression is satisfied.
28.60 <dhdh
However,
dh dh: Abbe number for d-line (wavelength 587.6 nm) of the lens

The variable magnification optical system according to any one of claims 1 to 4 , wherein the first lens group includes at least one of the lenses satisfying the following conditional expression.
0.450 <| fh / f1 | <1.400
However,
fh: focal length of the lens in the first lens group f1: focal length of the first lens group

The variable magnification optical system according to any one of claims 2 to 5 , wherein the first lens group includes at least one lens having a negative refractive power.

The variable magnification optical system according to any one of claims 1 to 5, wherein the first lens group has a positive lens which satisfies the following conditional expression.
75.00 <dpdp1
However,
dpdp1: Abbe number for d-line (wavelength 587.6 nm) of the positive lens in the first lens group

The variable magnification optical system according to any one of claims 1 to 12 , wherein the fifth lens group includes at least one lens.

The variable magnification optical system according to any one of claims 1 to 13 , wherein the fourth lens group includes at least one lens.

The variable magnification optical system according to any one of claims 1 to 14 , wherein the third lens group includes at least one lens.

The variable magnification optical system according to any one of claims 1 to 15 , wherein the fifth lens group includes at least one of the lenses having negative refractive power.

The variable power optical system according to any one of claims 1 to 16 , wherein the fifth lens group includes at least one lens satisfying the following conditional expression.
31.60 <dhdh5
However,
dhdh5: Abbe number for d-line (wavelength 587.6 nm) of the lens in the fifth lens group

The variable power optical system according to any one of claims 1 to 17 , wherein the fourth lens group includes at least one lens having a negative refractive power.

The variable power optical system according to any one of claims 1 to 18 , wherein the third lens group includes at least one lens having a negative refractive power.

The variable magnification optical system according to any one of claims 1 to 19 , wherein the fourth lens group includes a positive lens which satisfies the following conditional expression.
75.00 <dpdp4
However,
dpdp4: Abbe number for d-line (wavelength 587.6 nm) of the positive lens in the fourth lens group

21. The zoom lens according to any one of claims 1 to 20 , wherein an interval between the first lens group and the second lens group is increased at the time of zooming from the wide-angle end state to the telephoto end state. Variable magnification optical system.

22. The distance between the second lens group and the third lens group is reduced at the time of zooming from the wide-angle end state to the telephoto end state, as described in any one of claims 1 to 21 . Variable magnification optical system.

The distance between the third lens unit and the fourth lens unit is increased at the time of zooming from the wide-angle end state to the telephoto end state, according to any one of claims 1 to 22 , Variable magnification optical system.

An optical apparatus comprising the variable magnification optical system according to any one of claims 1 to 23 .